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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_bmap.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/xfs/xfs_bmap.c')
-rw-r--r--fs/xfs/xfs_bmap.c6246
1 files changed, 6246 insertions, 0 deletions
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
new file mode 100644
index 00000000000..de316241866
--- /dev/null
+++ b/fs/xfs/xfs_bmap.c
@@ -0,0 +1,6246 @@
1/*
2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32
33#include "xfs.h"
34
35#include "xfs_macros.h"
36#include "xfs_types.h"
37#include "xfs_inum.h"
38#include "xfs_log.h"
39#include "xfs_trans.h"
40#include "xfs_sb.h"
41#include "xfs_ag.h"
42#include "xfs_dir.h"
43#include "xfs_dir2.h"
44#include "xfs_dmapi.h"
45#include "xfs_mount.h"
46#include "xfs_alloc_btree.h"
47#include "xfs_bmap_btree.h"
48#include "xfs_ialloc_btree.h"
49#include "xfs_btree.h"
50#include "xfs_ialloc.h"
51#include "xfs_attr_sf.h"
52#include "xfs_dir_sf.h"
53#include "xfs_dir2_sf.h"
54#include "xfs_dinode.h"
55#include "xfs_inode_item.h"
56#include "xfs_inode.h"
57#include "xfs_itable.h"
58#include "xfs_extfree_item.h"
59#include "xfs_alloc.h"
60#include "xfs_bmap.h"
61#include "xfs_rtalloc.h"
62#include "xfs_error.h"
63#include "xfs_da_btree.h"
64#include "xfs_dir_leaf.h"
65#include "xfs_bit.h"
66#include "xfs_rw.h"
67#include "xfs_quota.h"
68#include "xfs_trans_space.h"
69#include "xfs_buf_item.h"
70
71
72#ifdef DEBUG
73STATIC void
74xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
75#endif
76
77kmem_zone_t *xfs_bmap_free_item_zone;
78
79/*
80 * Prototypes for internal bmap routines.
81 */
82
83
84/*
85 * Called from xfs_bmap_add_attrfork to handle extents format files.
86 */
87STATIC int /* error */
88xfs_bmap_add_attrfork_extents(
89 xfs_trans_t *tp, /* transaction pointer */
90 xfs_inode_t *ip, /* incore inode pointer */
91 xfs_fsblock_t *firstblock, /* first block allocated */
92 xfs_bmap_free_t *flist, /* blocks to free at commit */
93 int *flags); /* inode logging flags */
94
95/*
96 * Called from xfs_bmap_add_attrfork to handle local format files.
97 */
98STATIC int /* error */
99xfs_bmap_add_attrfork_local(
100 xfs_trans_t *tp, /* transaction pointer */
101 xfs_inode_t *ip, /* incore inode pointer */
102 xfs_fsblock_t *firstblock, /* first block allocated */
103 xfs_bmap_free_t *flist, /* blocks to free at commit */
104 int *flags); /* inode logging flags */
105
106/*
107 * Called by xfs_bmapi to update extent list structure and the btree
108 * after allocating space (or doing a delayed allocation).
109 */
110STATIC int /* error */
111xfs_bmap_add_extent(
112 xfs_inode_t *ip, /* incore inode pointer */
113 xfs_extnum_t idx, /* extent number to update/insert */
114 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
115 xfs_bmbt_irec_t *new, /* new data to put in extent list */
116 xfs_fsblock_t *first, /* pointer to firstblock variable */
117 xfs_bmap_free_t *flist, /* list of extents to be freed */
118 int *logflagsp, /* inode logging flags */
119 int whichfork, /* data or attr fork */
120 int rsvd); /* OK to allocate reserved blocks */
121
122/*
123 * Called by xfs_bmap_add_extent to handle cases converting a delayed
124 * allocation to a real allocation.
125 */
126STATIC int /* error */
127xfs_bmap_add_extent_delay_real(
128 xfs_inode_t *ip, /* incore inode pointer */
129 xfs_extnum_t idx, /* extent number to update/insert */
130 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
131 xfs_bmbt_irec_t *new, /* new data to put in extent list */
132 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
133 xfs_fsblock_t *first, /* pointer to firstblock variable */
134 xfs_bmap_free_t *flist, /* list of extents to be freed */
135 int *logflagsp, /* inode logging flags */
136 int rsvd); /* OK to allocate reserved blocks */
137
138/*
139 * Called by xfs_bmap_add_extent to handle cases converting a hole
140 * to a delayed allocation.
141 */
142STATIC int /* error */
143xfs_bmap_add_extent_hole_delay(
144 xfs_inode_t *ip, /* incore inode pointer */
145 xfs_extnum_t idx, /* extent number to update/insert */
146 xfs_btree_cur_t *cur, /* if null, not a btree */
147 xfs_bmbt_irec_t *new, /* new data to put in extent list */
148 int *logflagsp,/* inode logging flags */
149 int rsvd); /* OK to allocate reserved blocks */
150
151/*
152 * Called by xfs_bmap_add_extent to handle cases converting a hole
153 * to a real allocation.
154 */
155STATIC int /* error */
156xfs_bmap_add_extent_hole_real(
157 xfs_inode_t *ip, /* incore inode pointer */
158 xfs_extnum_t idx, /* extent number to update/insert */
159 xfs_btree_cur_t *cur, /* if null, not a btree */
160 xfs_bmbt_irec_t *new, /* new data to put in extent list */
161 int *logflagsp, /* inode logging flags */
162 int whichfork); /* data or attr fork */
163
164/*
165 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
166 * allocation to a real allocation or vice versa.
167 */
168STATIC int /* error */
169xfs_bmap_add_extent_unwritten_real(
170 xfs_inode_t *ip, /* incore inode pointer */
171 xfs_extnum_t idx, /* extent number to update/insert */
172 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
173 xfs_bmbt_irec_t *new, /* new data to put in extent list */
174 int *logflagsp); /* inode logging flags */
175
176/*
177 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
178 * It figures out where to ask the underlying allocator to put the new extent.
179 */
180STATIC int /* error */
181xfs_bmap_alloc(
182 xfs_bmalloca_t *ap); /* bmap alloc argument struct */
183
184/*
185 * Transform a btree format file with only one leaf node, where the
186 * extents list will fit in the inode, into an extents format file.
187 * Since the extent list is already in-core, all we have to do is
188 * give up the space for the btree root and pitch the leaf block.
189 */
190STATIC int /* error */
191xfs_bmap_btree_to_extents(
192 xfs_trans_t *tp, /* transaction pointer */
193 xfs_inode_t *ip, /* incore inode pointer */
194 xfs_btree_cur_t *cur, /* btree cursor */
195 int *logflagsp, /* inode logging flags */
196 int whichfork); /* data or attr fork */
197
198#ifdef DEBUG
199/*
200 * Check that the extents list for the inode ip is in the right order.
201 */
202STATIC void
203xfs_bmap_check_extents(
204 xfs_inode_t *ip, /* incore inode pointer */
205 int whichfork); /* data or attr fork */
206#endif
207
208/*
209 * Called by xfs_bmapi to update extent list structure and the btree
210 * after removing space (or undoing a delayed allocation).
211 */
212STATIC int /* error */
213xfs_bmap_del_extent(
214 xfs_inode_t *ip, /* incore inode pointer */
215 xfs_trans_t *tp, /* current trans pointer */
216 xfs_extnum_t idx, /* extent number to update/insert */
217 xfs_bmap_free_t *flist, /* list of extents to be freed */
218 xfs_btree_cur_t *cur, /* if null, not a btree */
219 xfs_bmbt_irec_t *new, /* new data to put in extent list */
220 int *logflagsp,/* inode logging flags */
221 int whichfork, /* data or attr fork */
222 int rsvd); /* OK to allocate reserved blocks */
223
224/*
225 * Remove the entry "free" from the free item list. Prev points to the
226 * previous entry, unless "free" is the head of the list.
227 */
228STATIC void
229xfs_bmap_del_free(
230 xfs_bmap_free_t *flist, /* free item list header */
231 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
232 xfs_bmap_free_item_t *free); /* list item to be freed */
233
234/*
235 * Remove count entries from the extents array for inode "ip", starting
236 * at index "idx". Copies the remaining items down over the deleted ones,
237 * and gives back the excess memory.
238 */
239STATIC void
240xfs_bmap_delete_exlist(
241 xfs_inode_t *ip, /* incode inode pointer */
242 xfs_extnum_t idx, /* starting delete index */
243 xfs_extnum_t count, /* count of items to delete */
244 int whichfork); /* data or attr fork */
245
246/*
247 * Convert an extents-format file into a btree-format file.
248 * The new file will have a root block (in the inode) and a single child block.
249 */
250STATIC int /* error */
251xfs_bmap_extents_to_btree(
252 xfs_trans_t *tp, /* transaction pointer */
253 xfs_inode_t *ip, /* incore inode pointer */
254 xfs_fsblock_t *firstblock, /* first-block-allocated */
255 xfs_bmap_free_t *flist, /* blocks freed in xaction */
256 xfs_btree_cur_t **curp, /* cursor returned to caller */
257 int wasdel, /* converting a delayed alloc */
258 int *logflagsp, /* inode logging flags */
259 int whichfork); /* data or attr fork */
260
261/*
262 * Insert new item(s) in the extent list for inode "ip".
263 * Count new items are inserted at offset idx.
264 */
265STATIC void
266xfs_bmap_insert_exlist(
267 xfs_inode_t *ip, /* incore inode pointer */
268 xfs_extnum_t idx, /* starting index of new items */
269 xfs_extnum_t count, /* number of inserted items */
270 xfs_bmbt_irec_t *new, /* items to insert */
271 int whichfork); /* data or attr fork */
272
273/*
274 * Convert a local file to an extents file.
275 * This code is sort of bogus, since the file data needs to get
276 * logged so it won't be lost. The bmap-level manipulations are ok, though.
277 */
278STATIC int /* error */
279xfs_bmap_local_to_extents(
280 xfs_trans_t *tp, /* transaction pointer */
281 xfs_inode_t *ip, /* incore inode pointer */
282 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
283 xfs_extlen_t total, /* total blocks needed by transaction */
284 int *logflagsp, /* inode logging flags */
285 int whichfork); /* data or attr fork */
286
287/*
288 * Search the extents list for the inode, for the extent containing bno.
289 * If bno lies in a hole, point to the next entry. If bno lies past eof,
290 * *eofp will be set, and *prevp will contain the last entry (null if none).
291 * Else, *lastxp will be set to the index of the found
292 * entry; *gotp will contain the entry.
293 */
294STATIC xfs_bmbt_rec_t * /* pointer to found extent entry */
295xfs_bmap_search_extents(
296 xfs_inode_t *ip, /* incore inode pointer */
297 xfs_fileoff_t bno, /* block number searched for */
298 int whichfork, /* data or attr fork */
299 int *eofp, /* out: end of file found */
300 xfs_extnum_t *lastxp, /* out: last extent index */
301 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
302 xfs_bmbt_irec_t *prevp); /* out: previous extent entry found */
303
304#ifdef XFS_BMAP_TRACE
305/*
306 * Add a bmap trace buffer entry. Base routine for the others.
307 */
308STATIC void
309xfs_bmap_trace_addentry(
310 int opcode, /* operation */
311 char *fname, /* function name */
312 char *desc, /* operation description */
313 xfs_inode_t *ip, /* incore inode pointer */
314 xfs_extnum_t idx, /* index of entry(ies) */
315 xfs_extnum_t cnt, /* count of entries, 1 or 2 */
316 xfs_bmbt_rec_t *r1, /* first record */
317 xfs_bmbt_rec_t *r2, /* second record or null */
318 int whichfork); /* data or attr fork */
319
320/*
321 * Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
322 */
323STATIC void
324xfs_bmap_trace_delete(
325 char *fname, /* function name */
326 char *desc, /* operation description */
327 xfs_inode_t *ip, /* incore inode pointer */
328 xfs_extnum_t idx, /* index of entry(entries) deleted */
329 xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
330 int whichfork); /* data or attr fork */
331
332/*
333 * Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
334 * reading in the extents list from the disk (in the btree).
335 */
336STATIC void
337xfs_bmap_trace_insert(
338 char *fname, /* function name */
339 char *desc, /* operation description */
340 xfs_inode_t *ip, /* incore inode pointer */
341 xfs_extnum_t idx, /* index of entry(entries) inserted */
342 xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
343 xfs_bmbt_irec_t *r1, /* inserted record 1 */
344 xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
345 int whichfork); /* data or attr fork */
346
347/*
348 * Add bmap trace entry after updating an extent list entry in place.
349 */
350STATIC void
351xfs_bmap_trace_post_update(
352 char *fname, /* function name */
353 char *desc, /* operation description */
354 xfs_inode_t *ip, /* incore inode pointer */
355 xfs_extnum_t idx, /* index of entry updated */
356 int whichfork); /* data or attr fork */
357
358/*
359 * Add bmap trace entry prior to updating an extent list entry in place.
360 */
361STATIC void
362xfs_bmap_trace_pre_update(
363 char *fname, /* function name */
364 char *desc, /* operation description */
365 xfs_inode_t *ip, /* incore inode pointer */
366 xfs_extnum_t idx, /* index of entry to be updated */
367 int whichfork); /* data or attr fork */
368
369#else
370#define xfs_bmap_trace_delete(f,d,ip,i,c,w)
371#define xfs_bmap_trace_insert(f,d,ip,i,c,r1,r2,w)
372#define xfs_bmap_trace_post_update(f,d,ip,i,w)
373#define xfs_bmap_trace_pre_update(f,d,ip,i,w)
374#endif /* XFS_BMAP_TRACE */
375
376/*
377 * Compute the worst-case number of indirect blocks that will be used
378 * for ip's delayed extent of length "len".
379 */
380STATIC xfs_filblks_t
381xfs_bmap_worst_indlen(
382 xfs_inode_t *ip, /* incore inode pointer */
383 xfs_filblks_t len); /* delayed extent length */
384
385#ifdef DEBUG
386/*
387 * Perform various validation checks on the values being returned
388 * from xfs_bmapi().
389 */
390STATIC void
391xfs_bmap_validate_ret(
392 xfs_fileoff_t bno,
393 xfs_filblks_t len,
394 int flags,
395 xfs_bmbt_irec_t *mval,
396 int nmap,
397 int ret_nmap);
398#else
399#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
400#endif /* DEBUG */
401
402#if defined(XFS_RW_TRACE)
403STATIC void
404xfs_bunmap_trace(
405 xfs_inode_t *ip,
406 xfs_fileoff_t bno,
407 xfs_filblks_t len,
408 int flags,
409 inst_t *ra);
410#else
411#define xfs_bunmap_trace(ip, bno, len, flags, ra)
412#endif /* XFS_RW_TRACE */
413
414STATIC int
415xfs_bmap_count_tree(
416 xfs_mount_t *mp,
417 xfs_trans_t *tp,
418 xfs_fsblock_t blockno,
419 int levelin,
420 int *count);
421
422STATIC int
423xfs_bmap_count_leaves(
424 xfs_bmbt_rec_t *frp,
425 int numrecs,
426 int *count);
427
428/*
429 * Bmap internal routines.
430 */
431
432/*
433 * Called from xfs_bmap_add_attrfork to handle btree format files.
434 */
435STATIC int /* error */
436xfs_bmap_add_attrfork_btree(
437 xfs_trans_t *tp, /* transaction pointer */
438 xfs_inode_t *ip, /* incore inode pointer */
439 xfs_fsblock_t *firstblock, /* first block allocated */
440 xfs_bmap_free_t *flist, /* blocks to free at commit */
441 int *flags) /* inode logging flags */
442{
443 xfs_btree_cur_t *cur; /* btree cursor */
444 int error; /* error return value */
445 xfs_mount_t *mp; /* file system mount struct */
446 int stat; /* newroot status */
447
448 mp = ip->i_mount;
449 if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
450 *flags |= XFS_ILOG_DBROOT;
451 else {
452 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
453 XFS_DATA_FORK);
454 cur->bc_private.b.flist = flist;
455 cur->bc_private.b.firstblock = *firstblock;
456 if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
457 goto error0;
458 ASSERT(stat == 1); /* must be at least one entry */
459 if ((error = xfs_bmbt_newroot(cur, flags, &stat)))
460 goto error0;
461 if (stat == 0) {
462 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
463 return XFS_ERROR(ENOSPC);
464 }
465 *firstblock = cur->bc_private.b.firstblock;
466 cur->bc_private.b.allocated = 0;
467 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
468 }
469 return 0;
470error0:
471 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
472 return error;
473}
474
475/*
476 * Called from xfs_bmap_add_attrfork to handle extents format files.
477 */
478STATIC int /* error */
479xfs_bmap_add_attrfork_extents(
480 xfs_trans_t *tp, /* transaction pointer */
481 xfs_inode_t *ip, /* incore inode pointer */
482 xfs_fsblock_t *firstblock, /* first block allocated */
483 xfs_bmap_free_t *flist, /* blocks to free at commit */
484 int *flags) /* inode logging flags */
485{
486 xfs_btree_cur_t *cur; /* bmap btree cursor */
487 int error; /* error return value */
488
489 if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
490 return 0;
491 cur = NULL;
492 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
493 flags, XFS_DATA_FORK);
494 if (cur) {
495 cur->bc_private.b.allocated = 0;
496 xfs_btree_del_cursor(cur,
497 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
498 }
499 return error;
500}
501
502/*
503 * Called from xfs_bmap_add_attrfork to handle local format files.
504 */
505STATIC int /* error */
506xfs_bmap_add_attrfork_local(
507 xfs_trans_t *tp, /* transaction pointer */
508 xfs_inode_t *ip, /* incore inode pointer */
509 xfs_fsblock_t *firstblock, /* first block allocated */
510 xfs_bmap_free_t *flist, /* blocks to free at commit */
511 int *flags) /* inode logging flags */
512{
513 xfs_da_args_t dargs; /* args for dir/attr code */
514 int error; /* error return value */
515 xfs_mount_t *mp; /* mount structure pointer */
516
517 if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
518 return 0;
519 if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
520 mp = ip->i_mount;
521 memset(&dargs, 0, sizeof(dargs));
522 dargs.dp = ip;
523 dargs.firstblock = firstblock;
524 dargs.flist = flist;
525 dargs.total = mp->m_dirblkfsbs;
526 dargs.whichfork = XFS_DATA_FORK;
527 dargs.trans = tp;
528 error = XFS_DIR_SHORTFORM_TO_SINGLE(mp, &dargs);
529 } else
530 error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
531 XFS_DATA_FORK);
532 return error;
533}
534
535/*
536 * Called by xfs_bmapi to update extent list structure and the btree
537 * after allocating space (or doing a delayed allocation).
538 */
539STATIC int /* error */
540xfs_bmap_add_extent(
541 xfs_inode_t *ip, /* incore inode pointer */
542 xfs_extnum_t idx, /* extent number to update/insert */
543 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
544 xfs_bmbt_irec_t *new, /* new data to put in extent list */
545 xfs_fsblock_t *first, /* pointer to firstblock variable */
546 xfs_bmap_free_t *flist, /* list of extents to be freed */
547 int *logflagsp, /* inode logging flags */
548 int whichfork, /* data or attr fork */
549 int rsvd) /* OK to use reserved data blocks */
550{
551 xfs_btree_cur_t *cur; /* btree cursor or null */
552 xfs_filblks_t da_new; /* new count del alloc blocks used */
553 xfs_filblks_t da_old; /* old count del alloc blocks used */
554 int error; /* error return value */
555#ifdef XFS_BMAP_TRACE
556 static char fname[] = "xfs_bmap_add_extent";
557#endif
558 xfs_ifork_t *ifp; /* inode fork ptr */
559 int logflags; /* returned value */
560 xfs_extnum_t nextents; /* number of extents in file now */
561
562 XFS_STATS_INC(xs_add_exlist);
563 cur = *curp;
564 ifp = XFS_IFORK_PTR(ip, whichfork);
565 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
566 ASSERT(idx <= nextents);
567 da_old = da_new = 0;
568 error = 0;
569 /*
570 * This is the first extent added to a new/empty file.
571 * Special case this one, so other routines get to assume there are
572 * already extents in the list.
573 */
574 if (nextents == 0) {
575 xfs_bmap_trace_insert(fname, "insert empty", ip, 0, 1, new,
576 NULL, whichfork);
577 xfs_bmap_insert_exlist(ip, 0, 1, new, whichfork);
578 ASSERT(cur == NULL);
579 ifp->if_lastex = 0;
580 if (!ISNULLSTARTBLOCK(new->br_startblock)) {
581 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
582 logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
583 } else
584 logflags = 0;
585 }
586 /*
587 * Any kind of new delayed allocation goes here.
588 */
589 else if (ISNULLSTARTBLOCK(new->br_startblock)) {
590 if (cur)
591 ASSERT((cur->bc_private.b.flags &
592 XFS_BTCUR_BPRV_WASDEL) == 0);
593 if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, cur, new,
594 &logflags, rsvd)))
595 goto done;
596 }
597 /*
598 * Real allocation off the end of the file.
599 */
600 else if (idx == nextents) {
601 if (cur)
602 ASSERT((cur->bc_private.b.flags &
603 XFS_BTCUR_BPRV_WASDEL) == 0);
604 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
605 &logflags, whichfork)))
606 goto done;
607 } else {
608 xfs_bmbt_irec_t prev; /* old extent at offset idx */
609
610 /*
611 * Get the record referred to by idx.
612 */
613 xfs_bmbt_get_all(&ifp->if_u1.if_extents[idx], &prev);
614 /*
615 * If it's a real allocation record, and the new allocation ends
616 * after the start of the referred to record, then we're filling
617 * in a delayed or unwritten allocation with a real one, or
618 * converting real back to unwritten.
619 */
620 if (!ISNULLSTARTBLOCK(new->br_startblock) &&
621 new->br_startoff + new->br_blockcount > prev.br_startoff) {
622 if (prev.br_state != XFS_EXT_UNWRITTEN &&
623 ISNULLSTARTBLOCK(prev.br_startblock)) {
624 da_old = STARTBLOCKVAL(prev.br_startblock);
625 if (cur)
626 ASSERT(cur->bc_private.b.flags &
627 XFS_BTCUR_BPRV_WASDEL);
628 if ((error = xfs_bmap_add_extent_delay_real(ip,
629 idx, &cur, new, &da_new, first, flist,
630 &logflags, rsvd)))
631 goto done;
632 } else if (new->br_state == XFS_EXT_NORM) {
633 ASSERT(new->br_state == XFS_EXT_NORM);
634 if ((error = xfs_bmap_add_extent_unwritten_real(
635 ip, idx, &cur, new, &logflags)))
636 goto done;
637 } else {
638 ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
639 if ((error = xfs_bmap_add_extent_unwritten_real(
640 ip, idx, &cur, new, &logflags)))
641 goto done;
642 }
643 ASSERT(*curp == cur || *curp == NULL);
644 }
645 /*
646 * Otherwise we're filling in a hole with an allocation.
647 */
648 else {
649 if (cur)
650 ASSERT((cur->bc_private.b.flags &
651 XFS_BTCUR_BPRV_WASDEL) == 0);
652 if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
653 new, &logflags, whichfork)))
654 goto done;
655 }
656 }
657
658 ASSERT(*curp == cur || *curp == NULL);
659 /*
660 * Convert to a btree if necessary.
661 */
662 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
663 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
664 int tmp_logflags; /* partial log flag return val */
665
666 ASSERT(cur == NULL);
667 error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
668 flist, &cur, da_old > 0, &tmp_logflags, whichfork);
669 logflags |= tmp_logflags;
670 if (error)
671 goto done;
672 }
673 /*
674 * Adjust for changes in reserved delayed indirect blocks.
675 * Nothing to do for disk quotas here.
676 */
677 if (da_old || da_new) {
678 xfs_filblks_t nblks;
679
680 nblks = da_new;
681 if (cur)
682 nblks += cur->bc_private.b.allocated;
683 ASSERT(nblks <= da_old);
684 if (nblks < da_old)
685 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
686 (int)(da_old - nblks), rsvd);
687 }
688 /*
689 * Clear out the allocated field, done with it now in any case.
690 */
691 if (cur) {
692 cur->bc_private.b.allocated = 0;
693 *curp = cur;
694 }
695done:
696#ifdef DEBUG
697 if (!error)
698 xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
699#endif
700 *logflagsp = logflags;
701 return error;
702}
703
704/*
705 * Called by xfs_bmap_add_extent to handle cases converting a delayed
706 * allocation to a real allocation.
707 */
708STATIC int /* error */
709xfs_bmap_add_extent_delay_real(
710 xfs_inode_t *ip, /* incore inode pointer */
711 xfs_extnum_t idx, /* extent number to update/insert */
712 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
713 xfs_bmbt_irec_t *new, /* new data to put in extent list */
714 xfs_filblks_t *dnew, /* new delayed-alloc indirect blocks */
715 xfs_fsblock_t *first, /* pointer to firstblock variable */
716 xfs_bmap_free_t *flist, /* list of extents to be freed */
717 int *logflagsp, /* inode logging flags */
718 int rsvd) /* OK to use reserved data block allocation */
719{
720 xfs_bmbt_rec_t *base; /* base of extent entry list */
721 xfs_btree_cur_t *cur; /* btree cursor */
722 int diff; /* temp value */
723 xfs_bmbt_rec_t *ep; /* extent entry for idx */
724 int error; /* error return value */
725#ifdef XFS_BMAP_TRACE
726 static char fname[] = "xfs_bmap_add_extent_delay_real";
727#endif
728 int i; /* temp state */
729 xfs_fileoff_t new_endoff; /* end offset of new entry */
730 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
731 /* left is 0, right is 1, prev is 2 */
732 int rval=0; /* return value (logging flags) */
733 int state = 0;/* state bits, accessed thru macros */
734 xfs_filblks_t temp; /* value for dnew calculations */
735 xfs_filblks_t temp2; /* value for dnew calculations */
736 int tmp_rval; /* partial logging flags */
737 enum { /* bit number definitions for state */
738 LEFT_CONTIG, RIGHT_CONTIG,
739 LEFT_FILLING, RIGHT_FILLING,
740 LEFT_DELAY, RIGHT_DELAY,
741 LEFT_VALID, RIGHT_VALID
742 };
743
744#define LEFT r[0]
745#define RIGHT r[1]
746#define PREV r[2]
747#define MASK(b) (1 << (b))
748#define MASK2(a,b) (MASK(a) | MASK(b))
749#define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
750#define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
751#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
752#define STATE_TEST(b) (state & MASK(b))
753#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
754 ((state &= ~MASK(b)), 0))
755#define SWITCH_STATE \
756 (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
757
758 /*
759 * Set up a bunch of variables to make the tests simpler.
760 */
761 cur = *curp;
762 base = ip->i_df.if_u1.if_extents;
763 ep = &base[idx];
764 xfs_bmbt_get_all(ep, &PREV);
765 new_endoff = new->br_startoff + new->br_blockcount;
766 ASSERT(PREV.br_startoff <= new->br_startoff);
767 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
768 /*
769 * Set flags determining what part of the previous delayed allocation
770 * extent is being replaced by a real allocation.
771 */
772 STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
773 STATE_SET(RIGHT_FILLING,
774 PREV.br_startoff + PREV.br_blockcount == new_endoff);
775 /*
776 * Check and set flags if this segment has a left neighbor.
777 * Don't set contiguous if the combined extent would be too large.
778 */
779 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
780 xfs_bmbt_get_all(ep - 1, &LEFT);
781 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
782 }
783 STATE_SET(LEFT_CONTIG,
784 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
785 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
786 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
787 LEFT.br_state == new->br_state &&
788 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
789 /*
790 * Check and set flags if this segment has a right neighbor.
791 * Don't set contiguous if the combined extent would be too large.
792 * Also check for all-three-contiguous being too large.
793 */
794 if (STATE_SET_TEST(RIGHT_VALID,
795 idx <
796 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
797 xfs_bmbt_get_all(ep + 1, &RIGHT);
798 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
799 }
800 STATE_SET(RIGHT_CONTIG,
801 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
802 new_endoff == RIGHT.br_startoff &&
803 new->br_startblock + new->br_blockcount ==
804 RIGHT.br_startblock &&
805 new->br_state == RIGHT.br_state &&
806 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
807 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
808 MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
809 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
810 <= MAXEXTLEN));
811 error = 0;
812 /*
813 * Switch out based on the FILLING and CONTIG state bits.
814 */
815 switch (SWITCH_STATE) {
816
817 case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
818 /*
819 * Filling in all of a previously delayed allocation extent.
820 * The left and right neighbors are both contiguous with new.
821 */
822 xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
823 XFS_DATA_FORK);
824 xfs_bmbt_set_blockcount(ep - 1,
825 LEFT.br_blockcount + PREV.br_blockcount +
826 RIGHT.br_blockcount);
827 xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
828 XFS_DATA_FORK);
829 xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
830 XFS_DATA_FORK);
831 xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
832 ip->i_df.if_lastex = idx - 1;
833 ip->i_d.di_nextents--;
834 if (cur == NULL)
835 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
836 else {
837 rval = XFS_ILOG_CORE;
838 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
839 RIGHT.br_startblock,
840 RIGHT.br_blockcount, &i)))
841 goto done;
842 ASSERT(i == 1);
843 if ((error = xfs_bmbt_delete(cur, &i)))
844 goto done;
845 ASSERT(i == 1);
846 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
847 goto done;
848 ASSERT(i == 1);
849 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
850 LEFT.br_startblock,
851 LEFT.br_blockcount +
852 PREV.br_blockcount +
853 RIGHT.br_blockcount, LEFT.br_state)))
854 goto done;
855 }
856 *dnew = 0;
857 break;
858
859 case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
860 /*
861 * Filling in all of a previously delayed allocation extent.
862 * The left neighbor is contiguous, the right is not.
863 */
864 xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
865 XFS_DATA_FORK);
866 xfs_bmbt_set_blockcount(ep - 1,
867 LEFT.br_blockcount + PREV.br_blockcount);
868 xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
869 XFS_DATA_FORK);
870 ip->i_df.if_lastex = idx - 1;
871 xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
872 XFS_DATA_FORK);
873 xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
874 if (cur == NULL)
875 rval = XFS_ILOG_DEXT;
876 else {
877 rval = 0;
878 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
879 LEFT.br_startblock, LEFT.br_blockcount,
880 &i)))
881 goto done;
882 ASSERT(i == 1);
883 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
884 LEFT.br_startblock,
885 LEFT.br_blockcount +
886 PREV.br_blockcount, LEFT.br_state)))
887 goto done;
888 }
889 *dnew = 0;
890 break;
891
892 case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
893 /*
894 * Filling in all of a previously delayed allocation extent.
895 * The right neighbor is contiguous, the left is not.
896 */
897 xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
898 XFS_DATA_FORK);
899 xfs_bmbt_set_startblock(ep, new->br_startblock);
900 xfs_bmbt_set_blockcount(ep,
901 PREV.br_blockcount + RIGHT.br_blockcount);
902 xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
903 XFS_DATA_FORK);
904 ip->i_df.if_lastex = idx;
905 xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
906 XFS_DATA_FORK);
907 xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
908 if (cur == NULL)
909 rval = XFS_ILOG_DEXT;
910 else {
911 rval = 0;
912 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
913 RIGHT.br_startblock,
914 RIGHT.br_blockcount, &i)))
915 goto done;
916 ASSERT(i == 1);
917 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
918 new->br_startblock,
919 PREV.br_blockcount +
920 RIGHT.br_blockcount, PREV.br_state)))
921 goto done;
922 }
923 *dnew = 0;
924 break;
925
926 case MASK2(LEFT_FILLING, RIGHT_FILLING):
927 /*
928 * Filling in all of a previously delayed allocation extent.
929 * Neither the left nor right neighbors are contiguous with
930 * the new one.
931 */
932 xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
933 XFS_DATA_FORK);
934 xfs_bmbt_set_startblock(ep, new->br_startblock);
935 xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
936 XFS_DATA_FORK);
937 ip->i_df.if_lastex = idx;
938 ip->i_d.di_nextents++;
939 if (cur == NULL)
940 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
941 else {
942 rval = XFS_ILOG_CORE;
943 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
944 new->br_startblock, new->br_blockcount,
945 &i)))
946 goto done;
947 ASSERT(i == 0);
948 cur->bc_rec.b.br_state = XFS_EXT_NORM;
949 if ((error = xfs_bmbt_insert(cur, &i)))
950 goto done;
951 ASSERT(i == 1);
952 }
953 *dnew = 0;
954 break;
955
956 case MASK2(LEFT_FILLING, LEFT_CONTIG):
957 /*
958 * Filling in the first part of a previous delayed allocation.
959 * The left neighbor is contiguous.
960 */
961 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
962 XFS_DATA_FORK);
963 xfs_bmbt_set_blockcount(ep - 1,
964 LEFT.br_blockcount + new->br_blockcount);
965 xfs_bmbt_set_startoff(ep,
966 PREV.br_startoff + new->br_blockcount);
967 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
968 XFS_DATA_FORK);
969 temp = PREV.br_blockcount - new->br_blockcount;
970 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
971 XFS_DATA_FORK);
972 xfs_bmbt_set_blockcount(ep, temp);
973 ip->i_df.if_lastex = idx - 1;
974 if (cur == NULL)
975 rval = XFS_ILOG_DEXT;
976 else {
977 rval = 0;
978 if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
979 LEFT.br_startblock, LEFT.br_blockcount,
980 &i)))
981 goto done;
982 ASSERT(i == 1);
983 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
984 LEFT.br_startblock,
985 LEFT.br_blockcount +
986 new->br_blockcount,
987 LEFT.br_state)))
988 goto done;
989 }
990 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
991 STARTBLOCKVAL(PREV.br_startblock));
992 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
993 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
994 XFS_DATA_FORK);
995 *dnew = temp;
996 break;
997
998 case MASK(LEFT_FILLING):
999 /*
1000 * Filling in the first part of a previous delayed allocation.
1001 * The left neighbor is not contiguous.
1002 */
1003 xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
1004 xfs_bmbt_set_startoff(ep, new_endoff);
1005 temp = PREV.br_blockcount - new->br_blockcount;
1006 xfs_bmbt_set_blockcount(ep, temp);
1007 xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
1008 XFS_DATA_FORK);
1009 xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
1010 ip->i_df.if_lastex = idx;
1011 ip->i_d.di_nextents++;
1012 if (cur == NULL)
1013 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1014 else {
1015 rval = XFS_ILOG_CORE;
1016 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1017 new->br_startblock, new->br_blockcount,
1018 &i)))
1019 goto done;
1020 ASSERT(i == 0);
1021 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1022 if ((error = xfs_bmbt_insert(cur, &i)))
1023 goto done;
1024 ASSERT(i == 1);
1025 }
1026 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1027 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1028 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1029 first, flist, &cur, 1, &tmp_rval,
1030 XFS_DATA_FORK);
1031 rval |= tmp_rval;
1032 if (error)
1033 goto done;
1034 }
1035 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1036 STARTBLOCKVAL(PREV.br_startblock) -
1037 (cur ? cur->bc_private.b.allocated : 0));
1038 base = ip->i_df.if_u1.if_extents;
1039 ep = &base[idx + 1];
1040 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1041 xfs_bmap_trace_post_update(fname, "LF", ip, idx + 1,
1042 XFS_DATA_FORK);
1043 *dnew = temp;
1044 break;
1045
1046 case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1047 /*
1048 * Filling in the last part of a previous delayed allocation.
1049 * The right neighbor is contiguous with the new allocation.
1050 */
1051 temp = PREV.br_blockcount - new->br_blockcount;
1052 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
1053 XFS_DATA_FORK);
1054 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
1055 XFS_DATA_FORK);
1056 xfs_bmbt_set_blockcount(ep, temp);
1057 xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
1058 new->br_blockcount + RIGHT.br_blockcount,
1059 RIGHT.br_state);
1060 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
1061 XFS_DATA_FORK);
1062 ip->i_df.if_lastex = idx + 1;
1063 if (cur == NULL)
1064 rval = XFS_ILOG_DEXT;
1065 else {
1066 rval = 0;
1067 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1068 RIGHT.br_startblock,
1069 RIGHT.br_blockcount, &i)))
1070 goto done;
1071 ASSERT(i == 1);
1072 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1073 new->br_startblock,
1074 new->br_blockcount +
1075 RIGHT.br_blockcount,
1076 RIGHT.br_state)))
1077 goto done;
1078 }
1079 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1080 STARTBLOCKVAL(PREV.br_startblock));
1081 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1082 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
1083 XFS_DATA_FORK);
1084 *dnew = temp;
1085 break;
1086
1087 case MASK(RIGHT_FILLING):
1088 /*
1089 * Filling in the last part of a previous delayed allocation.
1090 * The right neighbor is not contiguous.
1091 */
1092 temp = PREV.br_blockcount - new->br_blockcount;
1093 xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1094 xfs_bmbt_set_blockcount(ep, temp);
1095 xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
1096 new, NULL, XFS_DATA_FORK);
1097 xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
1098 ip->i_df.if_lastex = idx + 1;
1099 ip->i_d.di_nextents++;
1100 if (cur == NULL)
1101 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1102 else {
1103 rval = XFS_ILOG_CORE;
1104 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1105 new->br_startblock, new->br_blockcount,
1106 &i)))
1107 goto done;
1108 ASSERT(i == 0);
1109 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1110 if ((error = xfs_bmbt_insert(cur, &i)))
1111 goto done;
1112 ASSERT(i == 1);
1113 }
1114 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1115 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1116 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1117 first, flist, &cur, 1, &tmp_rval,
1118 XFS_DATA_FORK);
1119 rval |= tmp_rval;
1120 if (error)
1121 goto done;
1122 }
1123 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
1124 STARTBLOCKVAL(PREV.br_startblock) -
1125 (cur ? cur->bc_private.b.allocated : 0));
1126 base = ip->i_df.if_u1.if_extents;
1127 ep = &base[idx];
1128 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1129 xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1130 *dnew = temp;
1131 break;
1132
1133 case 0:
1134 /*
1135 * Filling in the middle part of a previous delayed allocation.
1136 * Contiguity is impossible here.
1137 * This case is avoided almost all the time.
1138 */
1139 temp = new->br_startoff - PREV.br_startoff;
1140 xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
1141 xfs_bmbt_set_blockcount(ep, temp);
1142 r[0] = *new;
1143 r[1].br_startoff = new_endoff;
1144 temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
1145 r[1].br_blockcount = temp2;
1146 xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
1147 XFS_DATA_FORK);
1148 xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
1149 ip->i_df.if_lastex = idx + 1;
1150 ip->i_d.di_nextents++;
1151 if (cur == NULL)
1152 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1153 else {
1154 rval = XFS_ILOG_CORE;
1155 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1156 new->br_startblock, new->br_blockcount,
1157 &i)))
1158 goto done;
1159 ASSERT(i == 0);
1160 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1161 if ((error = xfs_bmbt_insert(cur, &i)))
1162 goto done;
1163 ASSERT(i == 1);
1164 }
1165 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1166 ip->i_d.di_nextents > ip->i_df.if_ext_max) {
1167 error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
1168 first, flist, &cur, 1, &tmp_rval,
1169 XFS_DATA_FORK);
1170 rval |= tmp_rval;
1171 if (error)
1172 goto done;
1173 }
1174 temp = xfs_bmap_worst_indlen(ip, temp);
1175 temp2 = xfs_bmap_worst_indlen(ip, temp2);
1176 diff = (int)(temp + temp2 - STARTBLOCKVAL(PREV.br_startblock) -
1177 (cur ? cur->bc_private.b.allocated : 0));
1178 if (diff > 0 &&
1179 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -diff, rsvd)) {
1180 /*
1181 * Ick gross gag me with a spoon.
1182 */
1183 ASSERT(0); /* want to see if this ever happens! */
1184 while (diff > 0) {
1185 if (temp) {
1186 temp--;
1187 diff--;
1188 if (!diff ||
1189 !xfs_mod_incore_sb(ip->i_mount,
1190 XFS_SBS_FDBLOCKS, -diff, rsvd))
1191 break;
1192 }
1193 if (temp2) {
1194 temp2--;
1195 diff--;
1196 if (!diff ||
1197 !xfs_mod_incore_sb(ip->i_mount,
1198 XFS_SBS_FDBLOCKS, -diff, rsvd))
1199 break;
1200 }
1201 }
1202 }
1203 base = ip->i_df.if_u1.if_extents;
1204 ep = &base[idx];
1205 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
1206 xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
1207 xfs_bmap_trace_pre_update(fname, "0", ip, idx + 2,
1208 XFS_DATA_FORK);
1209 xfs_bmbt_set_startblock(ep + 2, NULLSTARTBLOCK((int)temp2));
1210 xfs_bmap_trace_post_update(fname, "0", ip, idx + 2,
1211 XFS_DATA_FORK);
1212 *dnew = temp + temp2;
1213 break;
1214
1215 case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1216 case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1217 case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1218 case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1219 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1220 case MASK(LEFT_CONTIG):
1221 case MASK(RIGHT_CONTIG):
1222 /*
1223 * These cases are all impossible.
1224 */
1225 ASSERT(0);
1226 }
1227 *curp = cur;
1228done:
1229 *logflagsp = rval;
1230 return error;
1231#undef LEFT
1232#undef RIGHT
1233#undef PREV
1234#undef MASK
1235#undef MASK2
1236#undef MASK3
1237#undef MASK4
1238#undef STATE_SET
1239#undef STATE_TEST
1240#undef STATE_SET_TEST
1241#undef SWITCH_STATE
1242}
1243
1244/*
1245 * Called by xfs_bmap_add_extent to handle cases converting an unwritten
1246 * allocation to a real allocation or vice versa.
1247 */
1248STATIC int /* error */
1249xfs_bmap_add_extent_unwritten_real(
1250 xfs_inode_t *ip, /* incore inode pointer */
1251 xfs_extnum_t idx, /* extent number to update/insert */
1252 xfs_btree_cur_t **curp, /* if *curp is null, not a btree */
1253 xfs_bmbt_irec_t *new, /* new data to put in extent list */
1254 int *logflagsp) /* inode logging flags */
1255{
1256 xfs_bmbt_rec_t *base; /* base of extent entry list */
1257 xfs_btree_cur_t *cur; /* btree cursor */
1258 xfs_bmbt_rec_t *ep; /* extent entry for idx */
1259 int error; /* error return value */
1260#ifdef XFS_BMAP_TRACE
1261 static char fname[] = "xfs_bmap_add_extent_unwritten_real";
1262#endif
1263 int i; /* temp state */
1264 xfs_fileoff_t new_endoff; /* end offset of new entry */
1265 xfs_exntst_t newext; /* new extent state */
1266 xfs_exntst_t oldext; /* old extent state */
1267 xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
1268 /* left is 0, right is 1, prev is 2 */
1269 int rval=0; /* return value (logging flags) */
1270 int state = 0;/* state bits, accessed thru macros */
1271 enum { /* bit number definitions for state */
1272 LEFT_CONTIG, RIGHT_CONTIG,
1273 LEFT_FILLING, RIGHT_FILLING,
1274 LEFT_DELAY, RIGHT_DELAY,
1275 LEFT_VALID, RIGHT_VALID
1276 };
1277
1278#define LEFT r[0]
1279#define RIGHT r[1]
1280#define PREV r[2]
1281#define MASK(b) (1 << (b))
1282#define MASK2(a,b) (MASK(a) | MASK(b))
1283#define MASK3(a,b,c) (MASK2(a,b) | MASK(c))
1284#define MASK4(a,b,c,d) (MASK3(a,b,c) | MASK(d))
1285#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1286#define STATE_TEST(b) (state & MASK(b))
1287#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1288 ((state &= ~MASK(b)), 0))
1289#define SWITCH_STATE \
1290 (state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
1291
1292 /*
1293 * Set up a bunch of variables to make the tests simpler.
1294 */
1295 error = 0;
1296 cur = *curp;
1297 base = ip->i_df.if_u1.if_extents;
1298 ep = &base[idx];
1299 xfs_bmbt_get_all(ep, &PREV);
1300 newext = new->br_state;
1301 oldext = (newext == XFS_EXT_UNWRITTEN) ?
1302 XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
1303 ASSERT(PREV.br_state == oldext);
1304 new_endoff = new->br_startoff + new->br_blockcount;
1305 ASSERT(PREV.br_startoff <= new->br_startoff);
1306 ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
1307 /*
1308 * Set flags determining what part of the previous oldext allocation
1309 * extent is being replaced by a newext allocation.
1310 */
1311 STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
1312 STATE_SET(RIGHT_FILLING,
1313 PREV.br_startoff + PREV.br_blockcount == new_endoff);
1314 /*
1315 * Check and set flags if this segment has a left neighbor.
1316 * Don't set contiguous if the combined extent would be too large.
1317 */
1318 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1319 xfs_bmbt_get_all(ep - 1, &LEFT);
1320 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
1321 }
1322 STATE_SET(LEFT_CONTIG,
1323 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
1324 LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
1325 LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
1326 LEFT.br_state == newext &&
1327 LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1328 /*
1329 * Check and set flags if this segment has a right neighbor.
1330 * Don't set contiguous if the combined extent would be too large.
1331 * Also check for all-three-contiguous being too large.
1332 */
1333 if (STATE_SET_TEST(RIGHT_VALID,
1334 idx <
1335 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
1336 xfs_bmbt_get_all(ep + 1, &RIGHT);
1337 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
1338 }
1339 STATE_SET(RIGHT_CONTIG,
1340 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
1341 new_endoff == RIGHT.br_startoff &&
1342 new->br_startblock + new->br_blockcount ==
1343 RIGHT.br_startblock &&
1344 newext == RIGHT.br_state &&
1345 new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
1346 ((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
1347 MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
1348 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
1349 <= MAXEXTLEN));
1350 /*
1351 * Switch out based on the FILLING and CONTIG state bits.
1352 */
1353 switch (SWITCH_STATE) {
1354
1355 case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1356 /*
1357 * Setting all of a previous oldext extent to newext.
1358 * The left and right neighbors are both contiguous with new.
1359 */
1360 xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
1361 XFS_DATA_FORK);
1362 xfs_bmbt_set_blockcount(ep - 1,
1363 LEFT.br_blockcount + PREV.br_blockcount +
1364 RIGHT.br_blockcount);
1365 xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
1366 XFS_DATA_FORK);
1367 xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
1368 XFS_DATA_FORK);
1369 xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
1370 ip->i_df.if_lastex = idx - 1;
1371 ip->i_d.di_nextents -= 2;
1372 if (cur == NULL)
1373 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1374 else {
1375 rval = XFS_ILOG_CORE;
1376 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1377 RIGHT.br_startblock,
1378 RIGHT.br_blockcount, &i)))
1379 goto done;
1380 ASSERT(i == 1);
1381 if ((error = xfs_bmbt_delete(cur, &i)))
1382 goto done;
1383 ASSERT(i == 1);
1384 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1385 goto done;
1386 ASSERT(i == 1);
1387 if ((error = xfs_bmbt_delete(cur, &i)))
1388 goto done;
1389 ASSERT(i == 1);
1390 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1391 goto done;
1392 ASSERT(i == 1);
1393 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1394 LEFT.br_startblock,
1395 LEFT.br_blockcount + PREV.br_blockcount +
1396 RIGHT.br_blockcount, LEFT.br_state)))
1397 goto done;
1398 }
1399 break;
1400
1401 case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
1402 /*
1403 * Setting all of a previous oldext extent to newext.
1404 * The left neighbor is contiguous, the right is not.
1405 */
1406 xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
1407 XFS_DATA_FORK);
1408 xfs_bmbt_set_blockcount(ep - 1,
1409 LEFT.br_blockcount + PREV.br_blockcount);
1410 xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
1411 XFS_DATA_FORK);
1412 ip->i_df.if_lastex = idx - 1;
1413 xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
1414 XFS_DATA_FORK);
1415 xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
1416 ip->i_d.di_nextents--;
1417 if (cur == NULL)
1418 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1419 else {
1420 rval = XFS_ILOG_CORE;
1421 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1422 PREV.br_startblock, PREV.br_blockcount,
1423 &i)))
1424 goto done;
1425 ASSERT(i == 1);
1426 if ((error = xfs_bmbt_delete(cur, &i)))
1427 goto done;
1428 ASSERT(i == 1);
1429 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1430 goto done;
1431 ASSERT(i == 1);
1432 if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
1433 LEFT.br_startblock,
1434 LEFT.br_blockcount + PREV.br_blockcount,
1435 LEFT.br_state)))
1436 goto done;
1437 }
1438 break;
1439
1440 case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
1441 /*
1442 * Setting all of a previous oldext extent to newext.
1443 * The right neighbor is contiguous, the left is not.
1444 */
1445 xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
1446 XFS_DATA_FORK);
1447 xfs_bmbt_set_blockcount(ep,
1448 PREV.br_blockcount + RIGHT.br_blockcount);
1449 xfs_bmbt_set_state(ep, newext);
1450 xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
1451 XFS_DATA_FORK);
1452 ip->i_df.if_lastex = idx;
1453 xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
1454 XFS_DATA_FORK);
1455 xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
1456 ip->i_d.di_nextents--;
1457 if (cur == NULL)
1458 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1459 else {
1460 rval = XFS_ILOG_CORE;
1461 if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
1462 RIGHT.br_startblock,
1463 RIGHT.br_blockcount, &i)))
1464 goto done;
1465 ASSERT(i == 1);
1466 if ((error = xfs_bmbt_delete(cur, &i)))
1467 goto done;
1468 ASSERT(i == 1);
1469 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1470 goto done;
1471 ASSERT(i == 1);
1472 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1473 new->br_startblock,
1474 new->br_blockcount + RIGHT.br_blockcount,
1475 newext)))
1476 goto done;
1477 }
1478 break;
1479
1480 case MASK2(LEFT_FILLING, RIGHT_FILLING):
1481 /*
1482 * Setting all of a previous oldext extent to newext.
1483 * Neither the left nor right neighbors are contiguous with
1484 * the new one.
1485 */
1486 xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
1487 XFS_DATA_FORK);
1488 xfs_bmbt_set_state(ep, newext);
1489 xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
1490 XFS_DATA_FORK);
1491 ip->i_df.if_lastex = idx;
1492 if (cur == NULL)
1493 rval = XFS_ILOG_DEXT;
1494 else {
1495 rval = 0;
1496 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1497 new->br_startblock, new->br_blockcount,
1498 &i)))
1499 goto done;
1500 ASSERT(i == 1);
1501 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1502 new->br_startblock, new->br_blockcount,
1503 newext)))
1504 goto done;
1505 }
1506 break;
1507
1508 case MASK2(LEFT_FILLING, LEFT_CONTIG):
1509 /*
1510 * Setting the first part of a previous oldext extent to newext.
1511 * The left neighbor is contiguous.
1512 */
1513 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
1514 XFS_DATA_FORK);
1515 xfs_bmbt_set_blockcount(ep - 1,
1516 LEFT.br_blockcount + new->br_blockcount);
1517 xfs_bmbt_set_startoff(ep,
1518 PREV.br_startoff + new->br_blockcount);
1519 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
1520 XFS_DATA_FORK);
1521 xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
1522 XFS_DATA_FORK);
1523 xfs_bmbt_set_startblock(ep,
1524 new->br_startblock + new->br_blockcount);
1525 xfs_bmbt_set_blockcount(ep,
1526 PREV.br_blockcount - new->br_blockcount);
1527 xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
1528 XFS_DATA_FORK);
1529 ip->i_df.if_lastex = idx - 1;
1530 if (cur == NULL)
1531 rval = XFS_ILOG_DEXT;
1532 else {
1533 rval = 0;
1534 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1535 PREV.br_startblock, PREV.br_blockcount,
1536 &i)))
1537 goto done;
1538 ASSERT(i == 1);
1539 if ((error = xfs_bmbt_update(cur,
1540 PREV.br_startoff + new->br_blockcount,
1541 PREV.br_startblock + new->br_blockcount,
1542 PREV.br_blockcount - new->br_blockcount,
1543 oldext)))
1544 goto done;
1545 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
1546 goto done;
1547 if (xfs_bmbt_update(cur, LEFT.br_startoff,
1548 LEFT.br_startblock,
1549 LEFT.br_blockcount + new->br_blockcount,
1550 LEFT.br_state))
1551 goto done;
1552 }
1553 break;
1554
1555 case MASK(LEFT_FILLING):
1556 /*
1557 * Setting the first part of a previous oldext extent to newext.
1558 * The left neighbor is not contiguous.
1559 */
1560 xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
1561 ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
1562 xfs_bmbt_set_startoff(ep, new_endoff);
1563 xfs_bmbt_set_blockcount(ep,
1564 PREV.br_blockcount - new->br_blockcount);
1565 xfs_bmbt_set_startblock(ep,
1566 new->br_startblock + new->br_blockcount);
1567 xfs_bmap_trace_post_update(fname, "LF", ip, idx, XFS_DATA_FORK);
1568 xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
1569 XFS_DATA_FORK);
1570 xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
1571 ip->i_df.if_lastex = idx;
1572 ip->i_d.di_nextents++;
1573 if (cur == NULL)
1574 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1575 else {
1576 rval = XFS_ILOG_CORE;
1577 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1578 PREV.br_startblock, PREV.br_blockcount,
1579 &i)))
1580 goto done;
1581 ASSERT(i == 1);
1582 if ((error = xfs_bmbt_update(cur,
1583 PREV.br_startoff + new->br_blockcount,
1584 PREV.br_startblock + new->br_blockcount,
1585 PREV.br_blockcount - new->br_blockcount,
1586 oldext)))
1587 goto done;
1588 cur->bc_rec.b = *new;
1589 if ((error = xfs_bmbt_insert(cur, &i)))
1590 goto done;
1591 ASSERT(i == 1);
1592 }
1593 break;
1594
1595 case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
1596 /*
1597 * Setting the last part of a previous oldext extent to newext.
1598 * The right neighbor is contiguous with the new allocation.
1599 */
1600 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
1601 XFS_DATA_FORK);
1602 xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
1603 XFS_DATA_FORK);
1604 xfs_bmbt_set_blockcount(ep,
1605 PREV.br_blockcount - new->br_blockcount);
1606 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
1607 XFS_DATA_FORK);
1608 xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
1609 new->br_blockcount + RIGHT.br_blockcount, newext);
1610 xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
1611 XFS_DATA_FORK);
1612 ip->i_df.if_lastex = idx + 1;
1613 if (cur == NULL)
1614 rval = XFS_ILOG_DEXT;
1615 else {
1616 rval = 0;
1617 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1618 PREV.br_startblock,
1619 PREV.br_blockcount, &i)))
1620 goto done;
1621 ASSERT(i == 1);
1622 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1623 PREV.br_startblock,
1624 PREV.br_blockcount - new->br_blockcount,
1625 oldext)))
1626 goto done;
1627 if ((error = xfs_bmbt_increment(cur, 0, &i)))
1628 goto done;
1629 if ((error = xfs_bmbt_update(cur, new->br_startoff,
1630 new->br_startblock,
1631 new->br_blockcount + RIGHT.br_blockcount,
1632 newext)))
1633 goto done;
1634 }
1635 break;
1636
1637 case MASK(RIGHT_FILLING):
1638 /*
1639 * Setting the last part of a previous oldext extent to newext.
1640 * The right neighbor is not contiguous.
1641 */
1642 xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1643 xfs_bmbt_set_blockcount(ep,
1644 PREV.br_blockcount - new->br_blockcount);
1645 xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
1646 xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
1647 new, NULL, XFS_DATA_FORK);
1648 xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
1649 ip->i_df.if_lastex = idx + 1;
1650 ip->i_d.di_nextents++;
1651 if (cur == NULL)
1652 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1653 else {
1654 rval = XFS_ILOG_CORE;
1655 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1656 PREV.br_startblock, PREV.br_blockcount,
1657 &i)))
1658 goto done;
1659 ASSERT(i == 1);
1660 if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
1661 PREV.br_startblock,
1662 PREV.br_blockcount - new->br_blockcount,
1663 oldext)))
1664 goto done;
1665 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
1666 new->br_startblock, new->br_blockcount,
1667 &i)))
1668 goto done;
1669 ASSERT(i == 0);
1670 cur->bc_rec.b.br_state = XFS_EXT_NORM;
1671 if ((error = xfs_bmbt_insert(cur, &i)))
1672 goto done;
1673 ASSERT(i == 1);
1674 }
1675 break;
1676
1677 case 0:
1678 /*
1679 * Setting the middle part of a previous oldext extent to
1680 * newext. Contiguity is impossible here.
1681 * One extent becomes three extents.
1682 */
1683 xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
1684 xfs_bmbt_set_blockcount(ep,
1685 new->br_startoff - PREV.br_startoff);
1686 xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
1687 r[0] = *new;
1688 r[1].br_startoff = new_endoff;
1689 r[1].br_blockcount =
1690 PREV.br_startoff + PREV.br_blockcount - new_endoff;
1691 r[1].br_startblock = new->br_startblock + new->br_blockcount;
1692 r[1].br_state = oldext;
1693 xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
1694 XFS_DATA_FORK);
1695 xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
1696 ip->i_df.if_lastex = idx + 1;
1697 ip->i_d.di_nextents += 2;
1698 if (cur == NULL)
1699 rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
1700 else {
1701 rval = XFS_ILOG_CORE;
1702 if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
1703 PREV.br_startblock, PREV.br_blockcount,
1704 &i)))
1705 goto done;
1706 ASSERT(i == 1);
1707 /* new right extent - oldext */
1708 if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
1709 r[1].br_startblock, r[1].br_blockcount,
1710 r[1].br_state)))
1711 goto done;
1712 /* new left extent - oldext */
1713 PREV.br_blockcount =
1714 new->br_startoff - PREV.br_startoff;
1715 cur->bc_rec.b = PREV;
1716 if ((error = xfs_bmbt_insert(cur, &i)))
1717 goto done;
1718 ASSERT(i == 1);
1719 if ((error = xfs_bmbt_increment(cur, 0, &i)))
1720 goto done;
1721 ASSERT(i == 1);
1722 /* new middle extent - newext */
1723 cur->bc_rec.b = *new;
1724 if ((error = xfs_bmbt_insert(cur, &i)))
1725 goto done;
1726 ASSERT(i == 1);
1727 }
1728 break;
1729
1730 case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1731 case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
1732 case MASK2(LEFT_FILLING, RIGHT_CONTIG):
1733 case MASK2(RIGHT_FILLING, LEFT_CONTIG):
1734 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1735 case MASK(LEFT_CONTIG):
1736 case MASK(RIGHT_CONTIG):
1737 /*
1738 * These cases are all impossible.
1739 */
1740 ASSERT(0);
1741 }
1742 *curp = cur;
1743done:
1744 *logflagsp = rval;
1745 return error;
1746#undef LEFT
1747#undef RIGHT
1748#undef PREV
1749#undef MASK
1750#undef MASK2
1751#undef MASK3
1752#undef MASK4
1753#undef STATE_SET
1754#undef STATE_TEST
1755#undef STATE_SET_TEST
1756#undef SWITCH_STATE
1757}
1758
1759/*
1760 * Called by xfs_bmap_add_extent to handle cases converting a hole
1761 * to a delayed allocation.
1762 */
1763/*ARGSUSED*/
1764STATIC int /* error */
1765xfs_bmap_add_extent_hole_delay(
1766 xfs_inode_t *ip, /* incore inode pointer */
1767 xfs_extnum_t idx, /* extent number to update/insert */
1768 xfs_btree_cur_t *cur, /* if null, not a btree */
1769 xfs_bmbt_irec_t *new, /* new data to put in extent list */
1770 int *logflagsp, /* inode logging flags */
1771 int rsvd) /* OK to allocate reserved blocks */
1772{
1773 xfs_bmbt_rec_t *base; /* base of extent entry list */
1774 xfs_bmbt_rec_t *ep; /* extent list entry for idx */
1775#ifdef XFS_BMAP_TRACE
1776 static char fname[] = "xfs_bmap_add_extent_hole_delay";
1777#endif
1778 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1779 xfs_filblks_t newlen=0; /* new indirect size */
1780 xfs_filblks_t oldlen=0; /* old indirect size */
1781 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1782 int state; /* state bits, accessed thru macros */
1783 xfs_filblks_t temp; /* temp for indirect calculations */
1784 enum { /* bit number definitions for state */
1785 LEFT_CONTIG, RIGHT_CONTIG,
1786 LEFT_DELAY, RIGHT_DELAY,
1787 LEFT_VALID, RIGHT_VALID
1788 };
1789
1790#define MASK(b) (1 << (b))
1791#define MASK2(a,b) (MASK(a) | MASK(b))
1792#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1793#define STATE_TEST(b) (state & MASK(b))
1794#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1795 ((state &= ~MASK(b)), 0))
1796#define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
1797
1798 base = ip->i_df.if_u1.if_extents;
1799 ep = &base[idx];
1800 state = 0;
1801 ASSERT(ISNULLSTARTBLOCK(new->br_startblock));
1802 /*
1803 * Check and set flags if this segment has a left neighbor
1804 */
1805 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1806 xfs_bmbt_get_all(ep - 1, &left);
1807 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
1808 }
1809 /*
1810 * Check and set flags if the current (right) segment exists.
1811 * If it doesn't exist, we're converting the hole at end-of-file.
1812 */
1813 if (STATE_SET_TEST(RIGHT_VALID,
1814 idx <
1815 ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
1816 xfs_bmbt_get_all(ep, &right);
1817 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
1818 }
1819 /*
1820 * Set contiguity flags on the left and right neighbors.
1821 * Don't let extents get too large, even if the pieces are contiguous.
1822 */
1823 STATE_SET(LEFT_CONTIG,
1824 STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
1825 left.br_startoff + left.br_blockcount == new->br_startoff &&
1826 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1827 STATE_SET(RIGHT_CONTIG,
1828 STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
1829 new->br_startoff + new->br_blockcount == right.br_startoff &&
1830 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
1831 (!STATE_TEST(LEFT_CONTIG) ||
1832 (left.br_blockcount + new->br_blockcount +
1833 right.br_blockcount <= MAXEXTLEN)));
1834 /*
1835 * Switch out based on the contiguity flags.
1836 */
1837 switch (SWITCH_STATE) {
1838
1839 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
1840 /*
1841 * New allocation is contiguous with delayed allocations
1842 * on the left and on the right.
1843 * Merge all three into a single extent list entry.
1844 */
1845 temp = left.br_blockcount + new->br_blockcount +
1846 right.br_blockcount;
1847 xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
1848 XFS_DATA_FORK);
1849 xfs_bmbt_set_blockcount(ep - 1, temp);
1850 oldlen = STARTBLOCKVAL(left.br_startblock) +
1851 STARTBLOCKVAL(new->br_startblock) +
1852 STARTBLOCKVAL(right.br_startblock);
1853 newlen = xfs_bmap_worst_indlen(ip, temp);
1854 xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
1855 xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
1856 XFS_DATA_FORK);
1857 xfs_bmap_trace_delete(fname, "LC|RC", ip, idx, 1,
1858 XFS_DATA_FORK);
1859 xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
1860 ip->i_df.if_lastex = idx - 1;
1861 break;
1862
1863 case MASK(LEFT_CONTIG):
1864 /*
1865 * New allocation is contiguous with a delayed allocation
1866 * on the left.
1867 * Merge the new allocation with the left neighbor.
1868 */
1869 temp = left.br_blockcount + new->br_blockcount;
1870 xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1,
1871 XFS_DATA_FORK);
1872 xfs_bmbt_set_blockcount(ep - 1, temp);
1873 oldlen = STARTBLOCKVAL(left.br_startblock) +
1874 STARTBLOCKVAL(new->br_startblock);
1875 newlen = xfs_bmap_worst_indlen(ip, temp);
1876 xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
1877 xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1,
1878 XFS_DATA_FORK);
1879 ip->i_df.if_lastex = idx - 1;
1880 break;
1881
1882 case MASK(RIGHT_CONTIG):
1883 /*
1884 * New allocation is contiguous with a delayed allocation
1885 * on the right.
1886 * Merge the new allocation with the right neighbor.
1887 */
1888 xfs_bmap_trace_pre_update(fname, "RC", ip, idx, XFS_DATA_FORK);
1889 temp = new->br_blockcount + right.br_blockcount;
1890 oldlen = STARTBLOCKVAL(new->br_startblock) +
1891 STARTBLOCKVAL(right.br_startblock);
1892 newlen = xfs_bmap_worst_indlen(ip, temp);
1893 xfs_bmbt_set_allf(ep, new->br_startoff,
1894 NULLSTARTBLOCK((int)newlen), temp, right.br_state);
1895 xfs_bmap_trace_post_update(fname, "RC", ip, idx, XFS_DATA_FORK);
1896 ip->i_df.if_lastex = idx;
1897 break;
1898
1899 case 0:
1900 /*
1901 * New allocation is not contiguous with another
1902 * delayed allocation.
1903 * Insert a new entry.
1904 */
1905 oldlen = newlen = 0;
1906 xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
1907 XFS_DATA_FORK);
1908 xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
1909 ip->i_df.if_lastex = idx;
1910 break;
1911 }
1912 if (oldlen != newlen) {
1913 ASSERT(oldlen > newlen);
1914 xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
1915 (int)(oldlen - newlen), rsvd);
1916 /*
1917 * Nothing to do for disk quota accounting here.
1918 */
1919 }
1920 *logflagsp = 0;
1921 return 0;
1922#undef MASK
1923#undef MASK2
1924#undef STATE_SET
1925#undef STATE_TEST
1926#undef STATE_SET_TEST
1927#undef SWITCH_STATE
1928}
1929
1930/*
1931 * Called by xfs_bmap_add_extent to handle cases converting a hole
1932 * to a real allocation.
1933 */
1934STATIC int /* error */
1935xfs_bmap_add_extent_hole_real(
1936 xfs_inode_t *ip, /* incore inode pointer */
1937 xfs_extnum_t idx, /* extent number to update/insert */
1938 xfs_btree_cur_t *cur, /* if null, not a btree */
1939 xfs_bmbt_irec_t *new, /* new data to put in extent list */
1940 int *logflagsp, /* inode logging flags */
1941 int whichfork) /* data or attr fork */
1942{
1943 xfs_bmbt_rec_t *ep; /* pointer to extent entry ins. point */
1944 int error; /* error return value */
1945#ifdef XFS_BMAP_TRACE
1946 static char fname[] = "xfs_bmap_add_extent_hole_real";
1947#endif
1948 int i; /* temp state */
1949 xfs_ifork_t *ifp; /* inode fork pointer */
1950 xfs_bmbt_irec_t left; /* left neighbor extent entry */
1951 xfs_bmbt_irec_t right; /* right neighbor extent entry */
1952 int state; /* state bits, accessed thru macros */
1953 enum { /* bit number definitions for state */
1954 LEFT_CONTIG, RIGHT_CONTIG,
1955 LEFT_DELAY, RIGHT_DELAY,
1956 LEFT_VALID, RIGHT_VALID
1957 };
1958
1959#define MASK(b) (1 << (b))
1960#define MASK2(a,b) (MASK(a) | MASK(b))
1961#define STATE_SET(b,v) ((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
1962#define STATE_TEST(b) (state & MASK(b))
1963#define STATE_SET_TEST(b,v) ((v) ? ((state |= MASK(b)), 1) : \
1964 ((state &= ~MASK(b)), 0))
1965#define SWITCH_STATE (state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
1966
1967 ifp = XFS_IFORK_PTR(ip, whichfork);
1968 ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
1969 ep = &ifp->if_u1.if_extents[idx];
1970 state = 0;
1971 /*
1972 * Check and set flags if this segment has a left neighbor.
1973 */
1974 if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
1975 xfs_bmbt_get_all(ep - 1, &left);
1976 STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
1977 }
1978 /*
1979 * Check and set flags if this segment has a current value.
1980 * Not true if we're inserting into the "hole" at eof.
1981 */
1982 if (STATE_SET_TEST(RIGHT_VALID,
1983 idx <
1984 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
1985 xfs_bmbt_get_all(ep, &right);
1986 STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
1987 }
1988 /*
1989 * We're inserting a real allocation between "left" and "right".
1990 * Set the contiguity flags. Don't let extents get too large.
1991 */
1992 STATE_SET(LEFT_CONTIG,
1993 STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
1994 left.br_startoff + left.br_blockcount == new->br_startoff &&
1995 left.br_startblock + left.br_blockcount == new->br_startblock &&
1996 left.br_state == new->br_state &&
1997 left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
1998 STATE_SET(RIGHT_CONTIG,
1999 STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
2000 new->br_startoff + new->br_blockcount == right.br_startoff &&
2001 new->br_startblock + new->br_blockcount ==
2002 right.br_startblock &&
2003 new->br_state == right.br_state &&
2004 new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
2005 (!STATE_TEST(LEFT_CONTIG) ||
2006 left.br_blockcount + new->br_blockcount +
2007 right.br_blockcount <= MAXEXTLEN));
2008
2009 /*
2010 * Select which case we're in here, and implement it.
2011 */
2012 switch (SWITCH_STATE) {
2013
2014 case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
2015 /*
2016 * New allocation is contiguous with real allocations on the
2017 * left and on the right.
2018 * Merge all three into a single extent list entry.
2019 */
2020 xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
2021 whichfork);
2022 xfs_bmbt_set_blockcount(ep - 1,
2023 left.br_blockcount + new->br_blockcount +
2024 right.br_blockcount);
2025 xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
2026 whichfork);
2027 xfs_bmap_trace_delete(fname, "LC|RC", ip,
2028 idx, 1, whichfork);
2029 xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
2030 ifp->if_lastex = idx - 1;
2031 XFS_IFORK_NEXT_SET(ip, whichfork,
2032 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2033 if (cur == NULL) {
2034 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2035 return 0;
2036 }
2037 *logflagsp = XFS_ILOG_CORE;
2038 if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
2039 right.br_startblock, right.br_blockcount, &i)))
2040 return error;
2041 ASSERT(i == 1);
2042 if ((error = xfs_bmbt_delete(cur, &i)))
2043 return error;
2044 ASSERT(i == 1);
2045 if ((error = xfs_bmbt_decrement(cur, 0, &i)))
2046 return error;
2047 ASSERT(i == 1);
2048 error = xfs_bmbt_update(cur, left.br_startoff,
2049 left.br_startblock,
2050 left.br_blockcount + new->br_blockcount +
2051 right.br_blockcount, left.br_state);
2052 return error;
2053
2054 case MASK(LEFT_CONTIG):
2055 /*
2056 * New allocation is contiguous with a real allocation
2057 * on the left.
2058 * Merge the new allocation with the left neighbor.
2059 */
2060 xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1, whichfork);
2061 xfs_bmbt_set_blockcount(ep - 1,
2062 left.br_blockcount + new->br_blockcount);
2063 xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1, whichfork);
2064 ifp->if_lastex = idx - 1;
2065 if (cur == NULL) {
2066 *logflagsp = XFS_ILOG_FEXT(whichfork);
2067 return 0;
2068 }
2069 *logflagsp = 0;
2070 if ((error = xfs_bmbt_lookup_eq(cur, left.br_startoff,
2071 left.br_startblock, left.br_blockcount, &i)))
2072 return error;
2073 ASSERT(i == 1);
2074 error = xfs_bmbt_update(cur, left.br_startoff,
2075 left.br_startblock,
2076 left.br_blockcount + new->br_blockcount,
2077 left.br_state);
2078 return error;
2079
2080 case MASK(RIGHT_CONTIG):
2081 /*
2082 * New allocation is contiguous with a real allocation
2083 * on the right.
2084 * Merge the new allocation with the right neighbor.
2085 */
2086 xfs_bmap_trace_pre_update(fname, "RC", ip, idx, whichfork);
2087 xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
2088 new->br_blockcount + right.br_blockcount,
2089 right.br_state);
2090 xfs_bmap_trace_post_update(fname, "RC", ip, idx, whichfork);
2091 ifp->if_lastex = idx;
2092 if (cur == NULL) {
2093 *logflagsp = XFS_ILOG_FEXT(whichfork);
2094 return 0;
2095 }
2096 *logflagsp = 0;
2097 if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
2098 right.br_startblock, right.br_blockcount, &i)))
2099 return error;
2100 ASSERT(i == 1);
2101 error = xfs_bmbt_update(cur, new->br_startoff,
2102 new->br_startblock,
2103 new->br_blockcount + right.br_blockcount,
2104 right.br_state);
2105 return error;
2106
2107 case 0:
2108 /*
2109 * New allocation is not contiguous with another
2110 * real allocation.
2111 * Insert a new entry.
2112 */
2113 xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
2114 whichfork);
2115 xfs_bmap_insert_exlist(ip, idx, 1, new, whichfork);
2116 ifp->if_lastex = idx;
2117 XFS_IFORK_NEXT_SET(ip, whichfork,
2118 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
2119 if (cur == NULL) {
2120 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2121 return 0;
2122 }
2123 *logflagsp = XFS_ILOG_CORE;
2124 if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
2125 new->br_startblock, new->br_blockcount, &i)))
2126 return error;
2127 ASSERT(i == 0);
2128 cur->bc_rec.b.br_state = new->br_state;
2129 if ((error = xfs_bmbt_insert(cur, &i)))
2130 return error;
2131 ASSERT(i == 1);
2132 return 0;
2133 }
2134#undef MASK
2135#undef MASK2
2136#undef STATE_SET
2137#undef STATE_TEST
2138#undef STATE_SET_TEST
2139#undef SWITCH_STATE
2140 /* NOTREACHED */
2141 ASSERT(0);
2142 return 0; /* keep gcc quite */
2143}
2144
2145#define XFS_ALLOC_GAP_UNITS 4
2146
2147/*
2148 * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
2149 * It figures out where to ask the underlying allocator to put the new extent.
2150 */
2151STATIC int /* error */
2152xfs_bmap_alloc(
2153 xfs_bmalloca_t *ap) /* bmap alloc argument struct */
2154{
2155 xfs_fsblock_t adjust; /* adjustment to block numbers */
2156 xfs_alloctype_t atype=0; /* type for allocation routines */
2157 int error; /* error return value */
2158 xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
2159 xfs_mount_t *mp; /* mount point structure */
2160 int nullfb; /* true if ap->firstblock isn't set */
2161 int rt; /* true if inode is realtime */
2162#ifdef __KERNEL__
2163 xfs_extlen_t prod=0; /* product factor for allocators */
2164 xfs_extlen_t ralen=0; /* realtime allocation length */
2165#endif
2166
2167#define ISVALID(x,y) \
2168 (rt ? \
2169 (x) < mp->m_sb.sb_rblocks : \
2170 XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
2171 XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
2172 XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
2173
2174 /*
2175 * Set up variables.
2176 */
2177 mp = ap->ip->i_mount;
2178 nullfb = ap->firstblock == NULLFSBLOCK;
2179 rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
2180 fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
2181#ifdef __KERNEL__
2182 if (rt) {
2183 xfs_extlen_t extsz; /* file extent size for rt */
2184 xfs_fileoff_t nexto; /* next file offset */
2185 xfs_extlen_t orig_alen; /* original ap->alen */
2186 xfs_fileoff_t orig_end; /* original off+len */
2187 xfs_fileoff_t orig_off; /* original ap->off */
2188 xfs_extlen_t mod_off; /* modulus calculations */
2189 xfs_fileoff_t prevo; /* previous file offset */
2190 xfs_rtblock_t rtx; /* realtime extent number */
2191 xfs_extlen_t temp; /* temp for rt calculations */
2192
2193 /*
2194 * Set prod to match the realtime extent size.
2195 */
2196 if (!(extsz = ap->ip->i_d.di_extsize))
2197 extsz = mp->m_sb.sb_rextsize;
2198 prod = extsz / mp->m_sb.sb_rextsize;
2199 orig_off = ap->off;
2200 orig_alen = ap->alen;
2201 orig_end = orig_off + orig_alen;
2202 /*
2203 * If the file offset is unaligned vs. the extent size
2204 * we need to align it. This will be possible unless
2205 * the file was previously written with a kernel that didn't
2206 * perform this alignment.
2207 */
2208 mod_off = do_mod(orig_off, extsz);
2209 if (mod_off) {
2210 ap->alen += mod_off;
2211 ap->off -= mod_off;
2212 }
2213 /*
2214 * Same adjustment for the end of the requested area.
2215 */
2216 if ((temp = (ap->alen % extsz)))
2217 ap->alen += extsz - temp;
2218 /*
2219 * If the previous block overlaps with this proposed allocation
2220 * then move the start forward without adjusting the length.
2221 */
2222 prevo =
2223 ap->prevp->br_startoff == NULLFILEOFF ?
2224 0 :
2225 (ap->prevp->br_startoff +
2226 ap->prevp->br_blockcount);
2227 if (ap->off != orig_off && ap->off < prevo)
2228 ap->off = prevo;
2229 /*
2230 * If the next block overlaps with this proposed allocation
2231 * then move the start back without adjusting the length,
2232 * but not before offset 0.
2233 * This may of course make the start overlap previous block,
2234 * and if we hit the offset 0 limit then the next block
2235 * can still overlap too.
2236 */
2237 nexto = (ap->eof || ap->gotp->br_startoff == NULLFILEOFF) ?
2238 NULLFILEOFF : ap->gotp->br_startoff;
2239 if (!ap->eof &&
2240 ap->off + ap->alen != orig_end &&
2241 ap->off + ap->alen > nexto)
2242 ap->off = nexto > ap->alen ? nexto - ap->alen : 0;
2243 /*
2244 * If we're now overlapping the next or previous extent that
2245 * means we can't fit an extsz piece in this hole. Just move
2246 * the start forward to the first valid spot and set
2247 * the length so we hit the end.
2248 */
2249 if ((ap->off != orig_off && ap->off < prevo) ||
2250 (ap->off + ap->alen != orig_end &&
2251 ap->off + ap->alen > nexto)) {
2252 ap->off = prevo;
2253 ap->alen = nexto - prevo;
2254 }
2255 /*
2256 * If the result isn't a multiple of rtextents we need to
2257 * remove blocks until it is.
2258 */
2259 if ((temp = (ap->alen % mp->m_sb.sb_rextsize))) {
2260 /*
2261 * We're not covering the original request, or
2262 * we won't be able to once we fix the length.
2263 */
2264 if (orig_off < ap->off ||
2265 orig_end > ap->off + ap->alen ||
2266 ap->alen - temp < orig_alen)
2267 return XFS_ERROR(EINVAL);
2268 /*
2269 * Try to fix it by moving the start up.
2270 */
2271 if (ap->off + temp <= orig_off) {
2272 ap->alen -= temp;
2273 ap->off += temp;
2274 }
2275 /*
2276 * Try to fix it by moving the end in.
2277 */
2278 else if (ap->off + ap->alen - temp >= orig_end)
2279 ap->alen -= temp;
2280 /*
2281 * Set the start to the minimum then trim the length.
2282 */
2283 else {
2284 ap->alen -= orig_off - ap->off;
2285 ap->off = orig_off;
2286 ap->alen -= ap->alen % mp->m_sb.sb_rextsize;
2287 }
2288 /*
2289 * Result doesn't cover the request, fail it.
2290 */
2291 if (orig_off < ap->off || orig_end > ap->off + ap->alen)
2292 return XFS_ERROR(EINVAL);
2293 }
2294 ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
2295 /*
2296 * If the offset & length are not perfectly aligned
2297 * then kill prod, it will just get us in trouble.
2298 */
2299 if (do_mod(ap->off, extsz) || ap->alen % extsz)
2300 prod = 1;
2301 /*
2302 * Set ralen to be the actual requested length in rtextents.
2303 */
2304 ralen = ap->alen / mp->m_sb.sb_rextsize;
2305 /*
2306 * If the old value was close enough to MAXEXTLEN that
2307 * we rounded up to it, cut it back so it's valid again.
2308 * Note that if it's a really large request (bigger than
2309 * MAXEXTLEN), we don't hear about that number, and can't
2310 * adjust the starting point to match it.
2311 */
2312 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
2313 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
2314 /*
2315 * If it's an allocation to an empty file at offset 0,
2316 * pick an extent that will space things out in the rt area.
2317 */
2318 if (ap->eof && ap->off == 0) {
2319 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
2320 if (error)
2321 return error;
2322 ap->rval = rtx * mp->m_sb.sb_rextsize;
2323 } else
2324 ap->rval = 0;
2325 }
2326#else
2327 if (rt)
2328 ap->rval = 0;
2329#endif /* __KERNEL__ */
2330 else if (nullfb)
2331 ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
2332 else
2333 ap->rval = ap->firstblock;
2334 /*
2335 * If allocating at eof, and there's a previous real block,
2336 * try to use it's last block as our starting point.
2337 */
2338 if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
2339 !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2340 ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
2341 ap->prevp->br_startblock)) {
2342 ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
2343 /*
2344 * Adjust for the gap between prevp and us.
2345 */
2346 adjust = ap->off -
2347 (ap->prevp->br_startoff + ap->prevp->br_blockcount);
2348 if (adjust &&
2349 ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
2350 ap->rval += adjust;
2351 }
2352 /*
2353 * If not at eof, then compare the two neighbor blocks.
2354 * Figure out whether either one gives us a good starting point,
2355 * and pick the better one.
2356 */
2357 else if (!ap->eof) {
2358 xfs_fsblock_t gotbno; /* right side block number */
2359 xfs_fsblock_t gotdiff=0; /* right side difference */
2360 xfs_fsblock_t prevbno; /* left side block number */
2361 xfs_fsblock_t prevdiff=0; /* left side difference */
2362
2363 /*
2364 * If there's a previous (left) block, select a requested
2365 * start block based on it.
2366 */
2367 if (ap->prevp->br_startoff != NULLFILEOFF &&
2368 !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
2369 (prevbno = ap->prevp->br_startblock +
2370 ap->prevp->br_blockcount) &&
2371 ISVALID(prevbno, ap->prevp->br_startblock)) {
2372 /*
2373 * Calculate gap to end of previous block.
2374 */
2375 adjust = prevdiff = ap->off -
2376 (ap->prevp->br_startoff +
2377 ap->prevp->br_blockcount);
2378 /*
2379 * Figure the startblock based on the previous block's
2380 * end and the gap size.
2381 * Heuristic!
2382 * If the gap is large relative to the piece we're
2383 * allocating, or using it gives us an invalid block
2384 * number, then just use the end of the previous block.
2385 */
2386 if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2387 ISVALID(prevbno + prevdiff,
2388 ap->prevp->br_startblock))
2389 prevbno += adjust;
2390 else
2391 prevdiff += adjust;
2392 /*
2393 * If the firstblock forbids it, can't use it,
2394 * must use default.
2395 */
2396 if (!rt && !nullfb &&
2397 XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
2398 prevbno = NULLFSBLOCK;
2399 }
2400 /*
2401 * No previous block or can't follow it, just default.
2402 */
2403 else
2404 prevbno = NULLFSBLOCK;
2405 /*
2406 * If there's a following (right) block, select a requested
2407 * start block based on it.
2408 */
2409 if (!ISNULLSTARTBLOCK(ap->gotp->br_startblock)) {
2410 /*
2411 * Calculate gap to start of next block.
2412 */
2413 adjust = gotdiff = ap->gotp->br_startoff - ap->off;
2414 /*
2415 * Figure the startblock based on the next block's
2416 * start and the gap size.
2417 */
2418 gotbno = ap->gotp->br_startblock;
2419 /*
2420 * Heuristic!
2421 * If the gap is large relative to the piece we're
2422 * allocating, or using it gives us an invalid block
2423 * number, then just use the start of the next block
2424 * offset by our length.
2425 */
2426 if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
2427 ISVALID(gotbno - gotdiff, gotbno))
2428 gotbno -= adjust;
2429 else if (ISVALID(gotbno - ap->alen, gotbno)) {
2430 gotbno -= ap->alen;
2431 gotdiff += adjust - ap->alen;
2432 } else
2433 gotdiff += adjust;
2434 /*
2435 * If the firstblock forbids it, can't use it,
2436 * must use default.
2437 */
2438 if (!rt && !nullfb &&
2439 XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
2440 gotbno = NULLFSBLOCK;
2441 }
2442 /*
2443 * No next block, just default.
2444 */
2445 else
2446 gotbno = NULLFSBLOCK;
2447 /*
2448 * If both valid, pick the better one, else the only good
2449 * one, else ap->rval is already set (to 0 or the inode block).
2450 */
2451 if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
2452 ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
2453 else if (prevbno != NULLFSBLOCK)
2454 ap->rval = prevbno;
2455 else if (gotbno != NULLFSBLOCK)
2456 ap->rval = gotbno;
2457 }
2458 /*
2459 * If allowed, use ap->rval; otherwise must use firstblock since
2460 * it's in the right allocation group.
2461 */
2462 if (nullfb || rt || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
2463 ;
2464 else
2465 ap->rval = ap->firstblock;
2466 /*
2467 * Realtime allocation, done through xfs_rtallocate_extent.
2468 */
2469 if (rt) {
2470#ifndef __KERNEL__
2471 ASSERT(0);
2472#else
2473 xfs_rtblock_t rtb;
2474
2475 atype = ap->rval == 0 ?
2476 XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
2477 do_div(ap->rval, mp->m_sb.sb_rextsize);
2478 rtb = ap->rval;
2479 ap->alen = ralen;
2480 if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
2481 &ralen, atype, ap->wasdel, prod, &rtb)))
2482 return error;
2483 if (rtb == NULLFSBLOCK && prod > 1 &&
2484 (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
2485 ap->alen, &ralen, atype,
2486 ap->wasdel, 1, &rtb)))
2487 return error;
2488 ap->rval = rtb;
2489 if (ap->rval != NULLFSBLOCK) {
2490 ap->rval *= mp->m_sb.sb_rextsize;
2491 ralen *= mp->m_sb.sb_rextsize;
2492 ap->alen = ralen;
2493 ap->ip->i_d.di_nblocks += ralen;
2494 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2495 if (ap->wasdel)
2496 ap->ip->i_delayed_blks -= ralen;
2497 /*
2498 * Adjust the disk quota also. This was reserved
2499 * earlier.
2500 */
2501 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
2502 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
2503 XFS_TRANS_DQ_RTBCOUNT,
2504 (long) ralen);
2505 } else
2506 ap->alen = 0;
2507#endif /* __KERNEL__ */
2508 }
2509 /*
2510 * Normal allocation, done through xfs_alloc_vextent.
2511 */
2512 else {
2513 xfs_agnumber_t ag;
2514 xfs_alloc_arg_t args;
2515 xfs_extlen_t blen;
2516 xfs_extlen_t delta;
2517 int isaligned;
2518 xfs_extlen_t longest;
2519 xfs_extlen_t need;
2520 xfs_extlen_t nextminlen=0;
2521 int notinit;
2522 xfs_perag_t *pag;
2523 xfs_agnumber_t startag;
2524 int tryagain;
2525
2526 tryagain = isaligned = 0;
2527 args.tp = ap->tp;
2528 args.mp = mp;
2529 args.fsbno = ap->rval;
2530 args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
2531 blen = 0;
2532 if (nullfb) {
2533 args.type = XFS_ALLOCTYPE_START_BNO;
2534 args.total = ap->total;
2535 /*
2536 * Find the longest available space.
2537 * We're going to try for the whole allocation at once.
2538 */
2539 startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
2540 notinit = 0;
2541 down_read(&mp->m_peraglock);
2542 while (blen < ap->alen) {
2543 pag = &mp->m_perag[ag];
2544 if (!pag->pagf_init &&
2545 (error = xfs_alloc_pagf_init(mp, args.tp,
2546 ag, XFS_ALLOC_FLAG_TRYLOCK))) {
2547 up_read(&mp->m_peraglock);
2548 return error;
2549 }
2550 /*
2551 * See xfs_alloc_fix_freelist...
2552 */
2553 if (pag->pagf_init) {
2554 need = XFS_MIN_FREELIST_PAG(pag, mp);
2555 delta = need > pag->pagf_flcount ?
2556 need - pag->pagf_flcount : 0;
2557 longest = (pag->pagf_longest > delta) ?
2558 (pag->pagf_longest - delta) :
2559 (pag->pagf_flcount > 0 ||
2560 pag->pagf_longest > 0);
2561 if (blen < longest)
2562 blen = longest;
2563 } else
2564 notinit = 1;
2565 if (++ag == mp->m_sb.sb_agcount)
2566 ag = 0;
2567 if (ag == startag)
2568 break;
2569 }
2570 up_read(&mp->m_peraglock);
2571 /*
2572 * Since the above loop did a BUF_TRYLOCK, it is
2573 * possible that there is space for this request.
2574 */
2575 if (notinit || blen < ap->minlen)
2576 args.minlen = ap->minlen;
2577 /*
2578 * If the best seen length is less than the request
2579 * length, use the best as the minimum.
2580 */
2581 else if (blen < ap->alen)
2582 args.minlen = blen;
2583 /*
2584 * Otherwise we've seen an extent as big as alen,
2585 * use that as the minimum.
2586 */
2587 else
2588 args.minlen = ap->alen;
2589 } else if (ap->low) {
2590 args.type = XFS_ALLOCTYPE_FIRST_AG;
2591 args.total = args.minlen = ap->minlen;
2592 } else {
2593 args.type = XFS_ALLOCTYPE_NEAR_BNO;
2594 args.total = ap->total;
2595 args.minlen = ap->minlen;
2596 }
2597 if (ap->ip->i_d.di_extsize) {
2598 args.prod = ap->ip->i_d.di_extsize;
2599 if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
2600 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2601 } else if (mp->m_sb.sb_blocksize >= NBPP) {
2602 args.prod = 1;
2603 args.mod = 0;
2604 } else {
2605 args.prod = NBPP >> mp->m_sb.sb_blocklog;
2606 if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
2607 args.mod = (xfs_extlen_t)(args.prod - args.mod);
2608 }
2609 /*
2610 * If we are not low on available data blocks, and the
2611 * underlying logical volume manager is a stripe, and
2612 * the file offset is zero then try to allocate data
2613 * blocks on stripe unit boundary.
2614 * NOTE: ap->aeof is only set if the allocation length
2615 * is >= the stripe unit and the allocation offset is
2616 * at the end of file.
2617 */
2618 if (!ap->low && ap->aeof) {
2619 if (!ap->off) {
2620 args.alignment = mp->m_dalign;
2621 atype = args.type;
2622 isaligned = 1;
2623 /*
2624 * Adjust for alignment
2625 */
2626 if (blen > args.alignment && blen <= ap->alen)
2627 args.minlen = blen - args.alignment;
2628 args.minalignslop = 0;
2629 } else {
2630 /*
2631 * First try an exact bno allocation.
2632 * If it fails then do a near or start bno
2633 * allocation with alignment turned on.
2634 */
2635 atype = args.type;
2636 tryagain = 1;
2637 args.type = XFS_ALLOCTYPE_THIS_BNO;
2638 args.alignment = 1;
2639 /*
2640 * Compute the minlen+alignment for the
2641 * next case. Set slop so that the value
2642 * of minlen+alignment+slop doesn't go up
2643 * between the calls.
2644 */
2645 if (blen > mp->m_dalign && blen <= ap->alen)
2646 nextminlen = blen - mp->m_dalign;
2647 else
2648 nextminlen = args.minlen;
2649 if (nextminlen + mp->m_dalign > args.minlen + 1)
2650 args.minalignslop =
2651 nextminlen + mp->m_dalign -
2652 args.minlen - 1;
2653 else
2654 args.minalignslop = 0;
2655 }
2656 } else {
2657 args.alignment = 1;
2658 args.minalignslop = 0;
2659 }
2660 args.minleft = ap->minleft;
2661 args.wasdel = ap->wasdel;
2662 args.isfl = 0;
2663 args.userdata = ap->userdata;
2664 if ((error = xfs_alloc_vextent(&args)))
2665 return error;
2666 if (tryagain && args.fsbno == NULLFSBLOCK) {
2667 /*
2668 * Exact allocation failed. Now try with alignment
2669 * turned on.
2670 */
2671 args.type = atype;
2672 args.fsbno = ap->rval;
2673 args.alignment = mp->m_dalign;
2674 args.minlen = nextminlen;
2675 args.minalignslop = 0;
2676 isaligned = 1;
2677 if ((error = xfs_alloc_vextent(&args)))
2678 return error;
2679 }
2680 if (isaligned && args.fsbno == NULLFSBLOCK) {
2681 /*
2682 * allocation failed, so turn off alignment and
2683 * try again.
2684 */
2685 args.type = atype;
2686 args.fsbno = ap->rval;
2687 args.alignment = 0;
2688 if ((error = xfs_alloc_vextent(&args)))
2689 return error;
2690 }
2691 if (args.fsbno == NULLFSBLOCK && nullfb &&
2692 args.minlen > ap->minlen) {
2693 args.minlen = ap->minlen;
2694 args.type = XFS_ALLOCTYPE_START_BNO;
2695 args.fsbno = ap->rval;
2696 if ((error = xfs_alloc_vextent(&args)))
2697 return error;
2698 }
2699 if (args.fsbno == NULLFSBLOCK && nullfb) {
2700 args.fsbno = 0;
2701 args.type = XFS_ALLOCTYPE_FIRST_AG;
2702 args.total = ap->minlen;
2703 args.minleft = 0;
2704 if ((error = xfs_alloc_vextent(&args)))
2705 return error;
2706 ap->low = 1;
2707 }
2708 if (args.fsbno != NULLFSBLOCK) {
2709 ap->firstblock = ap->rval = args.fsbno;
2710 ASSERT(nullfb || fb_agno == args.agno ||
2711 (ap->low && fb_agno < args.agno));
2712 ap->alen = args.len;
2713 ap->ip->i_d.di_nblocks += args.len;
2714 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
2715 if (ap->wasdel)
2716 ap->ip->i_delayed_blks -= args.len;
2717 /*
2718 * Adjust the disk quota also. This was reserved
2719 * earlier.
2720 */
2721 XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
2722 ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
2723 XFS_TRANS_DQ_BCOUNT,
2724 (long) args.len);
2725 } else {
2726 ap->rval = NULLFSBLOCK;
2727 ap->alen = 0;
2728 }
2729 }
2730 return 0;
2731#undef ISVALID
2732}
2733
2734/*
2735 * Transform a btree format file with only one leaf node, where the
2736 * extents list will fit in the inode, into an extents format file.
2737 * Since the extent list is already in-core, all we have to do is
2738 * give up the space for the btree root and pitch the leaf block.
2739 */
2740STATIC int /* error */
2741xfs_bmap_btree_to_extents(
2742 xfs_trans_t *tp, /* transaction pointer */
2743 xfs_inode_t *ip, /* incore inode pointer */
2744 xfs_btree_cur_t *cur, /* btree cursor */
2745 int *logflagsp, /* inode logging flags */
2746 int whichfork) /* data or attr fork */
2747{
2748 /* REFERENCED */
2749 xfs_bmbt_block_t *cblock;/* child btree block */
2750 xfs_fsblock_t cbno; /* child block number */
2751 xfs_buf_t *cbp; /* child block's buffer */
2752 int error; /* error return value */
2753 xfs_ifork_t *ifp; /* inode fork data */
2754 xfs_mount_t *mp; /* mount point structure */
2755 xfs_bmbt_ptr_t *pp; /* ptr to block address */
2756 xfs_bmbt_block_t *rblock;/* root btree block */
2757
2758 ifp = XFS_IFORK_PTR(ip, whichfork);
2759 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
2760 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
2761 rblock = ifp->if_broot;
2762 ASSERT(INT_GET(rblock->bb_level, ARCH_CONVERT) == 1);
2763 ASSERT(INT_GET(rblock->bb_numrecs, ARCH_CONVERT) == 1);
2764 ASSERT(XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes) == 1);
2765 mp = ip->i_mount;
2766 pp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, ifp->if_broot_bytes);
2767 *logflagsp = 0;
2768#ifdef DEBUG
2769 if ((error = xfs_btree_check_lptr(cur, INT_GET(*pp, ARCH_CONVERT), 1)))
2770 return error;
2771#endif
2772 cbno = INT_GET(*pp, ARCH_CONVERT);
2773 if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
2774 XFS_BMAP_BTREE_REF)))
2775 return error;
2776 cblock = XFS_BUF_TO_BMBT_BLOCK(cbp);
2777 if ((error = xfs_btree_check_lblock(cur, cblock, 0, cbp)))
2778 return error;
2779 xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
2780 ip->i_d.di_nblocks--;
2781 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
2782 xfs_trans_binval(tp, cbp);
2783 if (cur->bc_bufs[0] == cbp)
2784 cur->bc_bufs[0] = NULL;
2785 xfs_iroot_realloc(ip, -1, whichfork);
2786 ASSERT(ifp->if_broot == NULL);
2787 ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
2788 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
2789 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
2790 return 0;
2791}
2792
2793/*
2794 * Called by xfs_bmapi to update extent list structure and the btree
2795 * after removing space (or undoing a delayed allocation).
2796 */
2797STATIC int /* error */
2798xfs_bmap_del_extent(
2799 xfs_inode_t *ip, /* incore inode pointer */
2800 xfs_trans_t *tp, /* current transaction pointer */
2801 xfs_extnum_t idx, /* extent number to update/delete */
2802 xfs_bmap_free_t *flist, /* list of extents to be freed */
2803 xfs_btree_cur_t *cur, /* if null, not a btree */
2804 xfs_bmbt_irec_t *del, /* data to remove from extent list */
2805 int *logflagsp, /* inode logging flags */
2806 int whichfork, /* data or attr fork */
2807 int rsvd) /* OK to allocate reserved blocks */
2808{
2809 xfs_filblks_t da_new; /* new delay-alloc indirect blocks */
2810 xfs_filblks_t da_old; /* old delay-alloc indirect blocks */
2811 xfs_fsblock_t del_endblock=0; /* first block past del */
2812 xfs_fileoff_t del_endoff; /* first offset past del */
2813 int delay; /* current block is delayed allocated */
2814 int do_fx; /* free extent at end of routine */
2815 xfs_bmbt_rec_t *ep; /* current extent entry pointer */
2816 int error; /* error return value */
2817 int flags; /* inode logging flags */
2818#ifdef XFS_BMAP_TRACE
2819 static char fname[] = "xfs_bmap_del_extent";
2820#endif
2821 xfs_bmbt_irec_t got; /* current extent entry */
2822 xfs_fileoff_t got_endoff; /* first offset past got */
2823 int i; /* temp state */
2824 xfs_ifork_t *ifp; /* inode fork pointer */
2825 xfs_mount_t *mp; /* mount structure */
2826 xfs_filblks_t nblks; /* quota/sb block count */
2827 xfs_bmbt_irec_t new; /* new record to be inserted */
2828 /* REFERENCED */
2829 xfs_extnum_t nextents; /* number of extents in list */
2830 uint qfield; /* quota field to update */
2831 xfs_filblks_t temp; /* for indirect length calculations */
2832 xfs_filblks_t temp2; /* for indirect length calculations */
2833
2834 XFS_STATS_INC(xs_del_exlist);
2835 mp = ip->i_mount;
2836 ifp = XFS_IFORK_PTR(ip, whichfork);
2837 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
2838 ASSERT(idx >= 0 && idx < nextents);
2839 ASSERT(del->br_blockcount > 0);
2840 ep = &ifp->if_u1.if_extents[idx];
2841 xfs_bmbt_get_all(ep, &got);
2842 ASSERT(got.br_startoff <= del->br_startoff);
2843 del_endoff = del->br_startoff + del->br_blockcount;
2844 got_endoff = got.br_startoff + got.br_blockcount;
2845 ASSERT(got_endoff >= del_endoff);
2846 delay = ISNULLSTARTBLOCK(got.br_startblock);
2847 ASSERT(ISNULLSTARTBLOCK(del->br_startblock) == delay);
2848 flags = 0;
2849 qfield = 0;
2850 error = 0;
2851 /*
2852 * If deleting a real allocation, must free up the disk space.
2853 */
2854 if (!delay) {
2855 flags = XFS_ILOG_CORE;
2856 /*
2857 * Realtime allocation. Free it and record di_nblocks update.
2858 */
2859 if (whichfork == XFS_DATA_FORK &&
2860 (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
2861 xfs_fsblock_t bno;
2862 xfs_filblks_t len;
2863
2864 ASSERT(do_mod(del->br_blockcount,
2865 mp->m_sb.sb_rextsize) == 0);
2866 ASSERT(do_mod(del->br_startblock,
2867 mp->m_sb.sb_rextsize) == 0);
2868 bno = del->br_startblock;
2869 len = del->br_blockcount;
2870 do_div(bno, mp->m_sb.sb_rextsize);
2871 do_div(len, mp->m_sb.sb_rextsize);
2872 if ((error = xfs_rtfree_extent(ip->i_transp, bno,
2873 (xfs_extlen_t)len)))
2874 goto done;
2875 do_fx = 0;
2876 nblks = len * mp->m_sb.sb_rextsize;
2877 qfield = XFS_TRANS_DQ_RTBCOUNT;
2878 }
2879 /*
2880 * Ordinary allocation.
2881 */
2882 else {
2883 do_fx = 1;
2884 nblks = del->br_blockcount;
2885 qfield = XFS_TRANS_DQ_BCOUNT;
2886 }
2887 /*
2888 * Set up del_endblock and cur for later.
2889 */
2890 del_endblock = del->br_startblock + del->br_blockcount;
2891 if (cur) {
2892 if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
2893 got.br_startblock, got.br_blockcount,
2894 &i)))
2895 goto done;
2896 ASSERT(i == 1);
2897 }
2898 da_old = da_new = 0;
2899 } else {
2900 da_old = STARTBLOCKVAL(got.br_startblock);
2901 da_new = 0;
2902 nblks = 0;
2903 do_fx = 0;
2904 }
2905 /*
2906 * Set flag value to use in switch statement.
2907 * Left-contig is 2, right-contig is 1.
2908 */
2909 switch (((got.br_startoff == del->br_startoff) << 1) |
2910 (got_endoff == del_endoff)) {
2911 case 3:
2912 /*
2913 * Matches the whole extent. Delete the entry.
2914 */
2915 xfs_bmap_trace_delete(fname, "3", ip, idx, 1, whichfork);
2916 xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
2917 ifp->if_lastex = idx;
2918 if (delay)
2919 break;
2920 XFS_IFORK_NEXT_SET(ip, whichfork,
2921 XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
2922 flags |= XFS_ILOG_CORE;
2923 if (!cur) {
2924 flags |= XFS_ILOG_FEXT(whichfork);
2925 break;
2926 }
2927 if ((error = xfs_bmbt_delete(cur, &i)))
2928 goto done;
2929 ASSERT(i == 1);
2930 break;
2931
2932 case 2:
2933 /*
2934 * Deleting the first part of the extent.
2935 */
2936 xfs_bmap_trace_pre_update(fname, "2", ip, idx, whichfork);
2937 xfs_bmbt_set_startoff(ep, del_endoff);
2938 temp = got.br_blockcount - del->br_blockcount;
2939 xfs_bmbt_set_blockcount(ep, temp);
2940 ifp->if_lastex = idx;
2941 if (delay) {
2942 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2943 da_old);
2944 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
2945 xfs_bmap_trace_post_update(fname, "2", ip, idx,
2946 whichfork);
2947 da_new = temp;
2948 break;
2949 }
2950 xfs_bmbt_set_startblock(ep, del_endblock);
2951 xfs_bmap_trace_post_update(fname, "2", ip, idx, whichfork);
2952 if (!cur) {
2953 flags |= XFS_ILOG_FEXT(whichfork);
2954 break;
2955 }
2956 if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
2957 got.br_blockcount - del->br_blockcount,
2958 got.br_state)))
2959 goto done;
2960 break;
2961
2962 case 1:
2963 /*
2964 * Deleting the last part of the extent.
2965 */
2966 temp = got.br_blockcount - del->br_blockcount;
2967 xfs_bmap_trace_pre_update(fname, "1", ip, idx, whichfork);
2968 xfs_bmbt_set_blockcount(ep, temp);
2969 ifp->if_lastex = idx;
2970 if (delay) {
2971 temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
2972 da_old);
2973 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
2974 xfs_bmap_trace_post_update(fname, "1", ip, idx,
2975 whichfork);
2976 da_new = temp;
2977 break;
2978 }
2979 xfs_bmap_trace_post_update(fname, "1", ip, idx, whichfork);
2980 if (!cur) {
2981 flags |= XFS_ILOG_FEXT(whichfork);
2982 break;
2983 }
2984 if ((error = xfs_bmbt_update(cur, got.br_startoff,
2985 got.br_startblock,
2986 got.br_blockcount - del->br_blockcount,
2987 got.br_state)))
2988 goto done;
2989 break;
2990
2991 case 0:
2992 /*
2993 * Deleting the middle of the extent.
2994 */
2995 temp = del->br_startoff - got.br_startoff;
2996 xfs_bmap_trace_pre_update(fname, "0", ip, idx, whichfork);
2997 xfs_bmbt_set_blockcount(ep, temp);
2998 new.br_startoff = del_endoff;
2999 temp2 = got_endoff - del_endoff;
3000 new.br_blockcount = temp2;
3001 new.br_state = got.br_state;
3002 if (!delay) {
3003 new.br_startblock = del_endblock;
3004 flags |= XFS_ILOG_CORE;
3005 if (cur) {
3006 if ((error = xfs_bmbt_update(cur,
3007 got.br_startoff,
3008 got.br_startblock, temp,
3009 got.br_state)))
3010 goto done;
3011 if ((error = xfs_bmbt_increment(cur, 0, &i)))
3012 goto done;
3013 cur->bc_rec.b = new;
3014 error = xfs_bmbt_insert(cur, &i);
3015 if (error && error != ENOSPC)
3016 goto done;
3017 /*
3018 * If get no-space back from btree insert,
3019 * it tried a split, and we have a zero
3020 * block reservation.
3021 * Fix up our state and return the error.
3022 */
3023 if (error == ENOSPC) {
3024 /*
3025 * Reset the cursor, don't trust
3026 * it after any insert operation.
3027 */
3028 if ((error = xfs_bmbt_lookup_eq(cur,
3029 got.br_startoff,
3030 got.br_startblock,
3031 temp, &i)))
3032 goto done;
3033 ASSERT(i == 1);
3034 /*
3035 * Update the btree record back
3036 * to the original value.
3037 */
3038 if ((error = xfs_bmbt_update(cur,
3039 got.br_startoff,
3040 got.br_startblock,
3041 got.br_blockcount,
3042 got.br_state)))
3043 goto done;
3044 /*
3045 * Reset the extent record back
3046 * to the original value.
3047 */
3048 xfs_bmbt_set_blockcount(ep,
3049 got.br_blockcount);
3050 flags = 0;
3051 error = XFS_ERROR(ENOSPC);
3052 goto done;
3053 }
3054 ASSERT(i == 1);
3055 } else
3056 flags |= XFS_ILOG_FEXT(whichfork);
3057 XFS_IFORK_NEXT_SET(ip, whichfork,
3058 XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
3059 } else {
3060 ASSERT(whichfork == XFS_DATA_FORK);
3061 temp = xfs_bmap_worst_indlen(ip, temp);
3062 xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
3063 temp2 = xfs_bmap_worst_indlen(ip, temp2);
3064 new.br_startblock = NULLSTARTBLOCK((int)temp2);
3065 da_new = temp + temp2;
3066 while (da_new > da_old) {
3067 if (temp) {
3068 temp--;
3069 da_new--;
3070 xfs_bmbt_set_startblock(ep,
3071 NULLSTARTBLOCK((int)temp));
3072 }
3073 if (da_new == da_old)
3074 break;
3075 if (temp2) {
3076 temp2--;
3077 da_new--;
3078 new.br_startblock =
3079 NULLSTARTBLOCK((int)temp2);
3080 }
3081 }
3082 }
3083 xfs_bmap_trace_post_update(fname, "0", ip, idx, whichfork);
3084 xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 1, &new, NULL,
3085 whichfork);
3086 xfs_bmap_insert_exlist(ip, idx + 1, 1, &new, whichfork);
3087 ifp->if_lastex = idx + 1;
3088 break;
3089 }
3090 /*
3091 * If we need to, add to list of extents to delete.
3092 */
3093 if (do_fx)
3094 xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
3095 mp);
3096 /*
3097 * Adjust inode # blocks in the file.
3098 */
3099 if (nblks)
3100 ip->i_d.di_nblocks -= nblks;
3101 /*
3102 * Adjust quota data.
3103 */
3104 if (qfield)
3105 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, qfield, (long)-nblks);
3106
3107 /*
3108 * Account for change in delayed indirect blocks.
3109 * Nothing to do for disk quota accounting here.
3110 */
3111 ASSERT(da_old >= da_new);
3112 if (da_old > da_new)
3113 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int)(da_old - da_new),
3114 rsvd);
3115done:
3116 *logflagsp = flags;
3117 return error;
3118}
3119
3120/*
3121 * Remove the entry "free" from the free item list. Prev points to the
3122 * previous entry, unless "free" is the head of the list.
3123 */
3124STATIC void
3125xfs_bmap_del_free(
3126 xfs_bmap_free_t *flist, /* free item list header */
3127 xfs_bmap_free_item_t *prev, /* previous item on list, if any */
3128 xfs_bmap_free_item_t *free) /* list item to be freed */
3129{
3130 if (prev)
3131 prev->xbfi_next = free->xbfi_next;
3132 else
3133 flist->xbf_first = free->xbfi_next;
3134 flist->xbf_count--;
3135 kmem_zone_free(xfs_bmap_free_item_zone, free);
3136}
3137
3138/*
3139 * Remove count entries from the extents array for inode "ip", starting
3140 * at index "idx". Copies the remaining items down over the deleted ones,
3141 * and gives back the excess memory.
3142 */
3143STATIC void
3144xfs_bmap_delete_exlist(
3145 xfs_inode_t *ip, /* incore inode pointer */
3146 xfs_extnum_t idx, /* starting delete index */
3147 xfs_extnum_t count, /* count of items to delete */
3148 int whichfork) /* data or attr fork */
3149{
3150 xfs_bmbt_rec_t *base; /* base of extent list */
3151 xfs_ifork_t *ifp; /* inode fork pointer */
3152 xfs_extnum_t nextents; /* number of extents in list after */
3153
3154 ifp = XFS_IFORK_PTR(ip, whichfork);
3155 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
3156 base = ifp->if_u1.if_extents;
3157 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - count;
3158 memmove(&base[idx], &base[idx + count],
3159 (nextents - idx) * sizeof(*base));
3160 xfs_iext_realloc(ip, -count, whichfork);
3161}
3162
3163/*
3164 * Convert an extents-format file into a btree-format file.
3165 * The new file will have a root block (in the inode) and a single child block.
3166 */
3167STATIC int /* error */
3168xfs_bmap_extents_to_btree(
3169 xfs_trans_t *tp, /* transaction pointer */
3170 xfs_inode_t *ip, /* incore inode pointer */
3171 xfs_fsblock_t *firstblock, /* first-block-allocated */
3172 xfs_bmap_free_t *flist, /* blocks freed in xaction */
3173 xfs_btree_cur_t **curp, /* cursor returned to caller */
3174 int wasdel, /* converting a delayed alloc */
3175 int *logflagsp, /* inode logging flags */
3176 int whichfork) /* data or attr fork */
3177{
3178 xfs_bmbt_block_t *ablock; /* allocated (child) bt block */
3179 xfs_buf_t *abp; /* buffer for ablock */
3180 xfs_alloc_arg_t args; /* allocation arguments */
3181 xfs_bmbt_rec_t *arp; /* child record pointer */
3182 xfs_bmbt_block_t *block; /* btree root block */
3183 xfs_btree_cur_t *cur; /* bmap btree cursor */
3184 xfs_bmbt_rec_t *ep; /* extent list pointer */
3185 int error; /* error return value */
3186 xfs_extnum_t i, cnt; /* extent list index */
3187 xfs_ifork_t *ifp; /* inode fork pointer */
3188 xfs_bmbt_key_t *kp; /* root block key pointer */
3189 xfs_mount_t *mp; /* mount structure */
3190 xfs_extnum_t nextents; /* extent list size */
3191 xfs_bmbt_ptr_t *pp; /* root block address pointer */
3192
3193 ifp = XFS_IFORK_PTR(ip, whichfork);
3194 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
3195 ASSERT(ifp->if_ext_max ==
3196 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
3197 /*
3198 * Make space in the inode incore.
3199 */
3200 xfs_iroot_realloc(ip, 1, whichfork);
3201 ifp->if_flags |= XFS_IFBROOT;
3202 /*
3203 * Fill in the root.
3204 */
3205 block = ifp->if_broot;
3206 INT_SET(block->bb_magic, ARCH_CONVERT, XFS_BMAP_MAGIC);
3207 INT_SET(block->bb_level, ARCH_CONVERT, 1);
3208 INT_SET(block->bb_numrecs, ARCH_CONVERT, 1);
3209 INT_SET(block->bb_leftsib, ARCH_CONVERT, NULLDFSBNO);
3210 INT_SET(block->bb_rightsib, ARCH_CONVERT, NULLDFSBNO);
3211 /*
3212 * Need a cursor. Can't allocate until bb_level is filled in.
3213 */
3214 mp = ip->i_mount;
3215 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
3216 whichfork);
3217 cur->bc_private.b.firstblock = *firstblock;
3218 cur->bc_private.b.flist = flist;
3219 cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
3220 /*
3221 * Convert to a btree with two levels, one record in root.
3222 */
3223 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
3224 args.tp = tp;
3225 args.mp = mp;
3226 if (*firstblock == NULLFSBLOCK) {
3227 args.type = XFS_ALLOCTYPE_START_BNO;
3228 args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
3229 } else if (flist->xbf_low) {
3230 args.type = XFS_ALLOCTYPE_START_BNO;
3231 args.fsbno = *firstblock;
3232 } else {
3233 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3234 args.fsbno = *firstblock;
3235 }
3236 args.minlen = args.maxlen = args.prod = 1;
3237 args.total = args.minleft = args.alignment = args.mod = args.isfl =
3238 args.minalignslop = 0;
3239 args.wasdel = wasdel;
3240 *logflagsp = 0;
3241 if ((error = xfs_alloc_vextent(&args))) {
3242 xfs_iroot_realloc(ip, -1, whichfork);
3243 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
3244 return error;
3245 }
3246 /*
3247 * Allocation can't fail, the space was reserved.
3248 */
3249 ASSERT(args.fsbno != NULLFSBLOCK);
3250 ASSERT(*firstblock == NULLFSBLOCK ||
3251 args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
3252 (flist->xbf_low &&
3253 args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
3254 *firstblock = cur->bc_private.b.firstblock = args.fsbno;
3255 cur->bc_private.b.allocated++;
3256 ip->i_d.di_nblocks++;
3257 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
3258 abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
3259 /*
3260 * Fill in the child block.
3261 */
3262 ablock = XFS_BUF_TO_BMBT_BLOCK(abp);
3263 INT_SET(ablock->bb_magic, ARCH_CONVERT, XFS_BMAP_MAGIC);
3264 ablock->bb_level = 0;
3265 INT_SET(ablock->bb_leftsib, ARCH_CONVERT, NULLDFSBNO);
3266 INT_SET(ablock->bb_rightsib, ARCH_CONVERT, NULLDFSBNO);
3267 arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
3268 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3269 for (ep = ifp->if_u1.if_extents, cnt = i = 0; i < nextents; i++, ep++) {
3270 if (!ISNULLSTARTBLOCK(xfs_bmbt_get_startblock(ep))) {
3271 arp->l0 = INT_GET(ep->l0, ARCH_CONVERT);
3272 arp->l1 = INT_GET(ep->l1, ARCH_CONVERT);
3273 arp++; cnt++;
3274 }
3275 }
3276 INT_SET(ablock->bb_numrecs, ARCH_CONVERT, cnt);
3277 ASSERT(INT_GET(ablock->bb_numrecs, ARCH_CONVERT) == XFS_IFORK_NEXTENTS(ip, whichfork));
3278 /*
3279 * Fill in the root key and pointer.
3280 */
3281 kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
3282 arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
3283 INT_SET(kp->br_startoff, ARCH_CONVERT, xfs_bmbt_disk_get_startoff(arp));
3284 pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
3285 INT_SET(*pp, ARCH_CONVERT, args.fsbno);
3286 /*
3287 * Do all this logging at the end so that
3288 * the root is at the right level.
3289 */
3290 xfs_bmbt_log_block(cur, abp, XFS_BB_ALL_BITS);
3291 xfs_bmbt_log_recs(cur, abp, 1, INT_GET(ablock->bb_numrecs, ARCH_CONVERT));
3292 ASSERT(*curp == NULL);
3293 *curp = cur;
3294 *logflagsp = XFS_ILOG_CORE | XFS_ILOG_FBROOT(whichfork);
3295 return 0;
3296}
3297
3298/*
3299 * Insert new item(s) in the extent list for inode "ip".
3300 * Count new items are inserted at offset idx.
3301 */
3302STATIC void
3303xfs_bmap_insert_exlist(
3304 xfs_inode_t *ip, /* incore inode pointer */
3305 xfs_extnum_t idx, /* starting index of new items */
3306 xfs_extnum_t count, /* number of inserted items */
3307 xfs_bmbt_irec_t *new, /* items to insert */
3308 int whichfork) /* data or attr fork */
3309{
3310 xfs_bmbt_rec_t *base; /* extent list base */
3311 xfs_ifork_t *ifp; /* inode fork pointer */
3312 xfs_extnum_t nextents; /* extent list size */
3313 xfs_extnum_t to; /* extent list index */
3314
3315 ifp = XFS_IFORK_PTR(ip, whichfork);
3316 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
3317 xfs_iext_realloc(ip, count, whichfork);
3318 base = ifp->if_u1.if_extents;
3319 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3320 memmove(&base[idx + count], &base[idx],
3321 (nextents - (idx + count)) * sizeof(*base));
3322 for (to = idx; to < idx + count; to++, new++)
3323 xfs_bmbt_set_all(&base[to], new);
3324}
3325
3326/*
3327 * Convert a local file to an extents file.
3328 * This code is out of bounds for data forks of regular files,
3329 * since the file data needs to get logged so things will stay consistent.
3330 * (The bmap-level manipulations are ok, though).
3331 */
3332STATIC int /* error */
3333xfs_bmap_local_to_extents(
3334 xfs_trans_t *tp, /* transaction pointer */
3335 xfs_inode_t *ip, /* incore inode pointer */
3336 xfs_fsblock_t *firstblock, /* first block allocated in xaction */
3337 xfs_extlen_t total, /* total blocks needed by transaction */
3338 int *logflagsp, /* inode logging flags */
3339 int whichfork) /* data or attr fork */
3340{
3341 int error; /* error return value */
3342 int flags; /* logging flags returned */
3343#ifdef XFS_BMAP_TRACE
3344 static char fname[] = "xfs_bmap_local_to_extents";
3345#endif
3346 xfs_ifork_t *ifp; /* inode fork pointer */
3347
3348 /*
3349 * We don't want to deal with the case of keeping inode data inline yet.
3350 * So sending the data fork of a regular inode is invalid.
3351 */
3352 ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
3353 whichfork == XFS_DATA_FORK));
3354 ifp = XFS_IFORK_PTR(ip, whichfork);
3355 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
3356 flags = 0;
3357 error = 0;
3358 if (ifp->if_bytes) {
3359 xfs_alloc_arg_t args; /* allocation arguments */
3360 xfs_buf_t *bp; /* buffer for extent list block */
3361 xfs_bmbt_rec_t *ep; /* extent list pointer */
3362
3363 args.tp = tp;
3364 args.mp = ip->i_mount;
3365 ASSERT(ifp->if_flags & XFS_IFINLINE);
3366 /*
3367 * Allocate a block. We know we need only one, since the
3368 * file currently fits in an inode.
3369 */
3370 if (*firstblock == NULLFSBLOCK) {
3371 args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
3372 args.type = XFS_ALLOCTYPE_START_BNO;
3373 } else {
3374 args.fsbno = *firstblock;
3375 args.type = XFS_ALLOCTYPE_NEAR_BNO;
3376 }
3377 args.total = total;
3378 args.mod = args.minleft = args.alignment = args.wasdel =
3379 args.isfl = args.minalignslop = 0;
3380 args.minlen = args.maxlen = args.prod = 1;
3381 if ((error = xfs_alloc_vextent(&args)))
3382 goto done;
3383 /*
3384 * Can't fail, the space was reserved.
3385 */
3386 ASSERT(args.fsbno != NULLFSBLOCK);
3387 ASSERT(args.len == 1);
3388 *firstblock = args.fsbno;
3389 bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
3390 memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
3391 ifp->if_bytes);
3392 xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
3393 xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
3394 xfs_iext_realloc(ip, 1, whichfork);
3395 ep = ifp->if_u1.if_extents;
3396 xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
3397 xfs_bmap_trace_post_update(fname, "new", ip, 0, whichfork);
3398 XFS_IFORK_NEXT_SET(ip, whichfork, 1);
3399 ip->i_d.di_nblocks = 1;
3400 XFS_TRANS_MOD_DQUOT_BYINO(args.mp, tp, ip,
3401 XFS_TRANS_DQ_BCOUNT, 1L);
3402 flags |= XFS_ILOG_FEXT(whichfork);
3403 } else
3404 ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
3405 ifp->if_flags &= ~XFS_IFINLINE;
3406 ifp->if_flags |= XFS_IFEXTENTS;
3407 XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
3408 flags |= XFS_ILOG_CORE;
3409done:
3410 *logflagsp = flags;
3411 return error;
3412}
3413
3414xfs_bmbt_rec_t * /* pointer to found extent entry */
3415xfs_bmap_do_search_extents(
3416 xfs_bmbt_rec_t *base, /* base of extent list */
3417 xfs_extnum_t lastx, /* last extent index used */
3418 xfs_extnum_t nextents, /* extent list size */
3419 xfs_fileoff_t bno, /* block number searched for */
3420 int *eofp, /* out: end of file found */
3421 xfs_extnum_t *lastxp, /* out: last extent index */
3422 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3423 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3424{
3425 xfs_bmbt_rec_t *ep; /* extent list entry pointer */
3426 xfs_bmbt_irec_t got; /* extent list entry, decoded */
3427 int high; /* high index of binary search */
3428 int low; /* low index of binary search */
3429
3430 /*
3431 * Initialize the extent entry structure to catch access to
3432 * uninitialized br_startblock field.
3433 */
3434 got.br_startoff = 0xffa5a5a5a5a5a5a5LL;
3435 got.br_blockcount = 0xa55a5a5a5a5a5a5aLL;
3436 got.br_state = XFS_EXT_INVALID;
3437
3438#if XFS_BIG_BLKNOS
3439 got.br_startblock = 0xffffa5a5a5a5a5a5LL;
3440#else
3441 got.br_startblock = 0xffffa5a5;
3442#endif
3443
3444 if (lastx != NULLEXTNUM && lastx < nextents)
3445 ep = base + lastx;
3446 else
3447 ep = NULL;
3448 prevp->br_startoff = NULLFILEOFF;
3449 if (ep && bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep)) &&
3450 bno < got.br_startoff +
3451 (got.br_blockcount = xfs_bmbt_get_blockcount(ep)))
3452 *eofp = 0;
3453 else if (ep && lastx < nextents - 1 &&
3454 bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep + 1)) &&
3455 bno < got.br_startoff +
3456 (got.br_blockcount = xfs_bmbt_get_blockcount(ep + 1))) {
3457 lastx++;
3458 ep++;
3459 *eofp = 0;
3460 } else if (nextents == 0)
3461 *eofp = 1;
3462 else if (bno == 0 &&
3463 (got.br_startoff = xfs_bmbt_get_startoff(base)) == 0) {
3464 ep = base;
3465 lastx = 0;
3466 got.br_blockcount = xfs_bmbt_get_blockcount(ep);
3467 *eofp = 0;
3468 } else {
3469 /* binary search the extents array */
3470 low = 0;
3471 high = nextents - 1;
3472 while (low <= high) {
3473 XFS_STATS_INC(xs_cmp_exlist);
3474 lastx = (low + high) >> 1;
3475 ep = base + lastx;
3476 got.br_startoff = xfs_bmbt_get_startoff(ep);
3477 got.br_blockcount = xfs_bmbt_get_blockcount(ep);
3478 if (bno < got.br_startoff)
3479 high = lastx - 1;
3480 else if (bno >= got.br_startoff + got.br_blockcount)
3481 low = lastx + 1;
3482 else {
3483 got.br_startblock = xfs_bmbt_get_startblock(ep);
3484 got.br_state = xfs_bmbt_get_state(ep);
3485 *eofp = 0;
3486 *lastxp = lastx;
3487 *gotp = got;
3488 return ep;
3489 }
3490 }
3491 if (bno >= got.br_startoff + got.br_blockcount) {
3492 lastx++;
3493 if (lastx == nextents) {
3494 *eofp = 1;
3495 got.br_startblock = xfs_bmbt_get_startblock(ep);
3496 got.br_state = xfs_bmbt_get_state(ep);
3497 *prevp = got;
3498 ep = NULL;
3499 } else {
3500 *eofp = 0;
3501 xfs_bmbt_get_all(ep, prevp);
3502 ep++;
3503 got.br_startoff = xfs_bmbt_get_startoff(ep);
3504 got.br_blockcount = xfs_bmbt_get_blockcount(ep);
3505 }
3506 } else {
3507 *eofp = 0;
3508 if (ep > base)
3509 xfs_bmbt_get_all(ep - 1, prevp);
3510 }
3511 }
3512 if (ep) {
3513 got.br_startblock = xfs_bmbt_get_startblock(ep);
3514 got.br_state = xfs_bmbt_get_state(ep);
3515 }
3516 *lastxp = lastx;
3517 *gotp = got;
3518 return ep;
3519}
3520
3521/*
3522 * Search the extents list for the inode, for the extent containing bno.
3523 * If bno lies in a hole, point to the next entry. If bno lies past eof,
3524 * *eofp will be set, and *prevp will contain the last entry (null if none).
3525 * Else, *lastxp will be set to the index of the found
3526 * entry; *gotp will contain the entry.
3527 */
3528STATIC xfs_bmbt_rec_t * /* pointer to found extent entry */
3529xfs_bmap_search_extents(
3530 xfs_inode_t *ip, /* incore inode pointer */
3531 xfs_fileoff_t bno, /* block number searched for */
3532 int whichfork, /* data or attr fork */
3533 int *eofp, /* out: end of file found */
3534 xfs_extnum_t *lastxp, /* out: last extent index */
3535 xfs_bmbt_irec_t *gotp, /* out: extent entry found */
3536 xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */
3537{
3538 xfs_ifork_t *ifp; /* inode fork pointer */
3539 xfs_bmbt_rec_t *base; /* base of extent list */
3540 xfs_extnum_t lastx; /* last extent index used */
3541 xfs_extnum_t nextents; /* extent list size */
3542 xfs_bmbt_rec_t *ep; /* extent list entry pointer */
3543 int rt; /* realtime flag */
3544
3545 XFS_STATS_INC(xs_look_exlist);
3546 ifp = XFS_IFORK_PTR(ip, whichfork);
3547 lastx = ifp->if_lastex;
3548 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
3549 base = &ifp->if_u1.if_extents[0];
3550
3551 ep = xfs_bmap_do_search_extents(base, lastx, nextents, bno, eofp,
3552 lastxp, gotp, prevp);
3553 rt = ip->i_d.di_flags & XFS_DIFLAG_REALTIME;
3554 if(!rt && !gotp->br_startblock && (*lastxp != NULLEXTNUM)) {
3555 cmn_err(CE_PANIC,"Access to block zero: fs: <%s> inode: %lld "
3556 "start_block : %llx start_off : %llx blkcnt : %llx "
3557 "extent-state : %x \n",
3558 (ip->i_mount)->m_fsname,(long long)ip->i_ino,
3559 gotp->br_startblock, gotp->br_startoff,
3560 gotp->br_blockcount,gotp->br_state);
3561 }
3562 return ep;
3563}
3564
3565
3566#ifdef XFS_BMAP_TRACE
3567ktrace_t *xfs_bmap_trace_buf;
3568
3569/*
3570 * Add a bmap trace buffer entry. Base routine for the others.
3571 */
3572STATIC void
3573xfs_bmap_trace_addentry(
3574 int opcode, /* operation */
3575 char *fname, /* function name */
3576 char *desc, /* operation description */
3577 xfs_inode_t *ip, /* incore inode pointer */
3578 xfs_extnum_t idx, /* index of entry(ies) */
3579 xfs_extnum_t cnt, /* count of entries, 1 or 2 */
3580 xfs_bmbt_rec_t *r1, /* first record */
3581 xfs_bmbt_rec_t *r2, /* second record or null */
3582 int whichfork) /* data or attr fork */
3583{
3584 xfs_bmbt_rec_t tr2;
3585
3586 ASSERT(cnt == 1 || cnt == 2);
3587 ASSERT(r1 != NULL);
3588 if (cnt == 1) {
3589 ASSERT(r2 == NULL);
3590 r2 = &tr2;
3591 memset(&tr2, 0, sizeof(tr2));
3592 } else
3593 ASSERT(r2 != NULL);
3594 ktrace_enter(xfs_bmap_trace_buf,
3595 (void *)(__psint_t)(opcode | (whichfork << 16)),
3596 (void *)fname, (void *)desc, (void *)ip,
3597 (void *)(__psint_t)idx,
3598 (void *)(__psint_t)cnt,
3599 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3600 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3601 (void *)(__psunsigned_t)(r1->l0 >> 32),
3602 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3603 (void *)(__psunsigned_t)(r1->l1 >> 32),
3604 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3605 (void *)(__psunsigned_t)(r2->l0 >> 32),
3606 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3607 (void *)(__psunsigned_t)(r2->l1 >> 32),
3608 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3609 );
3610 ASSERT(ip->i_xtrace);
3611 ktrace_enter(ip->i_xtrace,
3612 (void *)(__psint_t)(opcode | (whichfork << 16)),
3613 (void *)fname, (void *)desc, (void *)ip,
3614 (void *)(__psint_t)idx,
3615 (void *)(__psint_t)cnt,
3616 (void *)(__psunsigned_t)(ip->i_ino >> 32),
3617 (void *)(__psunsigned_t)(unsigned)ip->i_ino,
3618 (void *)(__psunsigned_t)(r1->l0 >> 32),
3619 (void *)(__psunsigned_t)(unsigned)(r1->l0),
3620 (void *)(__psunsigned_t)(r1->l1 >> 32),
3621 (void *)(__psunsigned_t)(unsigned)(r1->l1),
3622 (void *)(__psunsigned_t)(r2->l0 >> 32),
3623 (void *)(__psunsigned_t)(unsigned)(r2->l0),
3624 (void *)(__psunsigned_t)(r2->l1 >> 32),
3625 (void *)(__psunsigned_t)(unsigned)(r2->l1)
3626 );
3627}
3628
3629/*
3630 * Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
3631 */
3632STATIC void
3633xfs_bmap_trace_delete(
3634 char *fname, /* function name */
3635 char *desc, /* operation description */
3636 xfs_inode_t *ip, /* incore inode pointer */
3637 xfs_extnum_t idx, /* index of entry(entries) deleted */
3638 xfs_extnum_t cnt, /* count of entries deleted, 1 or 2 */
3639 int whichfork) /* data or attr fork */
3640{
3641 xfs_ifork_t *ifp; /* inode fork pointer */
3642
3643 ifp = XFS_IFORK_PTR(ip, whichfork);
3644 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_DELETE, fname, desc, ip, idx,
3645 cnt, &ifp->if_u1.if_extents[idx],
3646 cnt == 2 ? &ifp->if_u1.if_extents[idx + 1] : NULL,
3647 whichfork);
3648}
3649
3650/*
3651 * Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
3652 * reading in the extents list from the disk (in the btree).
3653 */
3654STATIC void
3655xfs_bmap_trace_insert(
3656 char *fname, /* function name */
3657 char *desc, /* operation description */
3658 xfs_inode_t *ip, /* incore inode pointer */
3659 xfs_extnum_t idx, /* index of entry(entries) inserted */
3660 xfs_extnum_t cnt, /* count of entries inserted, 1 or 2 */
3661 xfs_bmbt_irec_t *r1, /* inserted record 1 */
3662 xfs_bmbt_irec_t *r2, /* inserted record 2 or null */
3663 int whichfork) /* data or attr fork */
3664{
3665 xfs_bmbt_rec_t tr1; /* compressed record 1 */
3666 xfs_bmbt_rec_t tr2; /* compressed record 2 if needed */
3667
3668 xfs_bmbt_set_all(&tr1, r1);
3669 if (cnt == 2) {
3670 ASSERT(r2 != NULL);
3671 xfs_bmbt_set_all(&tr2, r2);
3672 } else {
3673 ASSERT(cnt == 1);
3674 ASSERT(r2 == NULL);
3675 }
3676 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_INSERT, fname, desc, ip, idx,
3677 cnt, &tr1, cnt == 2 ? &tr2 : NULL, whichfork);
3678}
3679
3680/*
3681 * Add bmap trace entry after updating an extent list entry in place.
3682 */
3683STATIC void
3684xfs_bmap_trace_post_update(
3685 char *fname, /* function name */
3686 char *desc, /* operation description */
3687 xfs_inode_t *ip, /* incore inode pointer */
3688 xfs_extnum_t idx, /* index of entry updated */
3689 int whichfork) /* data or attr fork */
3690{
3691 xfs_ifork_t *ifp; /* inode fork pointer */
3692
3693 ifp = XFS_IFORK_PTR(ip, whichfork);
3694 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_POST_UP, fname, desc, ip, idx,
3695 1, &ifp->if_u1.if_extents[idx], NULL, whichfork);
3696}
3697
3698/*
3699 * Add bmap trace entry prior to updating an extent list entry in place.
3700 */
3701STATIC void
3702xfs_bmap_trace_pre_update(
3703 char *fname, /* function name */
3704 char *desc, /* operation description */
3705 xfs_inode_t *ip, /* incore inode pointer */
3706 xfs_extnum_t idx, /* index of entry to be updated */
3707 int whichfork) /* data or attr fork */
3708{
3709 xfs_ifork_t *ifp; /* inode fork pointer */
3710
3711 ifp = XFS_IFORK_PTR(ip, whichfork);
3712 xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_PRE_UP, fname, desc, ip, idx, 1,
3713 &ifp->if_u1.if_extents[idx], NULL, whichfork);
3714}
3715#endif /* XFS_BMAP_TRACE */
3716
3717/*
3718 * Compute the worst-case number of indirect blocks that will be used
3719 * for ip's delayed extent of length "len".
3720 */
3721STATIC xfs_filblks_t
3722xfs_bmap_worst_indlen(
3723 xfs_inode_t *ip, /* incore inode pointer */
3724 xfs_filblks_t len) /* delayed extent length */
3725{
3726 int level; /* btree level number */
3727 int maxrecs; /* maximum record count at this level */
3728 xfs_mount_t *mp; /* mount structure */
3729 xfs_filblks_t rval; /* return value */
3730
3731 mp = ip->i_mount;
3732 maxrecs = mp->m_bmap_dmxr[0];
3733 for (level = 0, rval = 0;
3734 level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
3735 level++) {
3736 len += maxrecs - 1;
3737 do_div(len, maxrecs);
3738 rval += len;
3739 if (len == 1)
3740 return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
3741 level - 1;
3742 if (level == 0)
3743 maxrecs = mp->m_bmap_dmxr[1];
3744 }
3745 return rval;
3746}
3747
3748#if defined(XFS_RW_TRACE)
3749STATIC void
3750xfs_bunmap_trace(
3751 xfs_inode_t *ip,
3752 xfs_fileoff_t bno,
3753 xfs_filblks_t len,
3754 int flags,
3755 inst_t *ra)
3756{
3757 if (ip->i_rwtrace == NULL)
3758 return;
3759 ktrace_enter(ip->i_rwtrace,
3760 (void *)(__psint_t)XFS_BUNMAPI,
3761 (void *)ip,
3762 (void *)(__psint_t)((ip->i_d.di_size >> 32) & 0xffffffff),
3763 (void *)(__psint_t)(ip->i_d.di_size & 0xffffffff),
3764 (void *)(__psint_t)(((xfs_dfiloff_t)bno >> 32) & 0xffffffff),
3765 (void *)(__psint_t)((xfs_dfiloff_t)bno & 0xffffffff),
3766 (void *)(__psint_t)len,
3767 (void *)(__psint_t)flags,
3768 (void *)(unsigned long)current_cpu(),
3769 (void *)ra,
3770 (void *)0,
3771 (void *)0,
3772 (void *)0,
3773 (void *)0,
3774 (void *)0,
3775 (void *)0);
3776}
3777#endif
3778
3779/*
3780 * Convert inode from non-attributed to attributed.
3781 * Must not be in a transaction, ip must not be locked.
3782 */
3783int /* error code */
3784xfs_bmap_add_attrfork(
3785 xfs_inode_t *ip, /* incore inode pointer */
3786 int rsvd) /* OK to allocated reserved blocks in trans */
3787{
3788 int blks; /* space reservation */
3789 int committed; /* xaction was committed */
3790 int error; /* error return value */
3791 xfs_fsblock_t firstblock; /* 1st block/ag allocated */
3792 xfs_bmap_free_t flist; /* freed extent list */
3793 int logflags; /* logging flags */
3794 xfs_mount_t *mp; /* mount structure */
3795 unsigned long s; /* spinlock spl value */
3796 xfs_trans_t *tp; /* transaction pointer */
3797
3798 ASSERT(ip->i_df.if_ext_max ==
3799 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3800 if (XFS_IFORK_Q(ip))
3801 return 0;
3802 mp = ip->i_mount;
3803 ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
3804 tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
3805 blks = XFS_ADDAFORK_SPACE_RES(mp);
3806 if (rsvd)
3807 tp->t_flags |= XFS_TRANS_RESERVE;
3808 if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
3809 XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
3810 goto error0;
3811 xfs_ilock(ip, XFS_ILOCK_EXCL);
3812 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, blks, 0, rsvd ?
3813 XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
3814 XFS_QMOPT_RES_REGBLKS);
3815 if (error) {
3816 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3817 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
3818 return error;
3819 }
3820 if (XFS_IFORK_Q(ip))
3821 goto error1;
3822 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
3823 /*
3824 * For inodes coming from pre-6.2 filesystems.
3825 */
3826 ASSERT(ip->i_d.di_aformat == 0);
3827 ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
3828 }
3829 ASSERT(ip->i_d.di_anextents == 0);
3830 VN_HOLD(XFS_ITOV(ip));
3831 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3832 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3833 switch (ip->i_d.di_format) {
3834 case XFS_DINODE_FMT_DEV:
3835 ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
3836 break;
3837 case XFS_DINODE_FMT_UUID:
3838 ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
3839 break;
3840 case XFS_DINODE_FMT_LOCAL:
3841 case XFS_DINODE_FMT_EXTENTS:
3842 case XFS_DINODE_FMT_BTREE:
3843 ip->i_d.di_forkoff = mp->m_attroffset >> 3;
3844 break;
3845 default:
3846 ASSERT(0);
3847 error = XFS_ERROR(EINVAL);
3848 goto error1;
3849 }
3850 ip->i_df.if_ext_max =
3851 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3852 ASSERT(ip->i_afp == NULL);
3853 ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
3854 ip->i_afp->if_ext_max =
3855 XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
3856 ip->i_afp->if_flags = XFS_IFEXTENTS;
3857 logflags = 0;
3858 XFS_BMAP_INIT(&flist, &firstblock);
3859 switch (ip->i_d.di_format) {
3860 case XFS_DINODE_FMT_LOCAL:
3861 error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
3862 &logflags);
3863 break;
3864 case XFS_DINODE_FMT_EXTENTS:
3865 error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
3866 &flist, &logflags);
3867 break;
3868 case XFS_DINODE_FMT_BTREE:
3869 error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
3870 &logflags);
3871 break;
3872 default:
3873 error = 0;
3874 break;
3875 }
3876 if (logflags)
3877 xfs_trans_log_inode(tp, ip, logflags);
3878 if (error)
3879 goto error2;
3880 if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
3881 s = XFS_SB_LOCK(mp);
3882 if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
3883 XFS_SB_VERSION_ADDATTR(&mp->m_sb);
3884 XFS_SB_UNLOCK(mp, s);
3885 xfs_mod_sb(tp, XFS_SB_VERSIONNUM);
3886 } else
3887 XFS_SB_UNLOCK(mp, s);
3888 }
3889 if ((error = xfs_bmap_finish(&tp, &flist, firstblock, &committed)))
3890 goto error2;
3891 error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES, NULL);
3892 ASSERT(ip->i_df.if_ext_max ==
3893 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3894 return error;
3895error2:
3896 xfs_bmap_cancel(&flist);
3897error1:
3898 ASSERT(ismrlocked(&ip->i_lock,MR_UPDATE));
3899 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3900error0:
3901 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
3902 ASSERT(ip->i_df.if_ext_max ==
3903 XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
3904 return error;
3905}
3906
3907/*
3908 * Add the extent to the list of extents to be free at transaction end.
3909 * The list is maintained sorted (by block number).
3910 */
3911/* ARGSUSED */
3912void
3913xfs_bmap_add_free(
3914 xfs_fsblock_t bno, /* fs block number of extent */
3915 xfs_filblks_t len, /* length of extent */
3916 xfs_bmap_free_t *flist, /* list of extents */
3917 xfs_mount_t *mp) /* mount point structure */
3918{
3919 xfs_bmap_free_item_t *cur; /* current (next) element */
3920 xfs_bmap_free_item_t *new; /* new element */
3921 xfs_bmap_free_item_t *prev; /* previous element */
3922#ifdef DEBUG
3923 xfs_agnumber_t agno;
3924 xfs_agblock_t agbno;
3925
3926 ASSERT(bno != NULLFSBLOCK);
3927 ASSERT(len > 0);
3928 ASSERT(len <= MAXEXTLEN);
3929 ASSERT(!ISNULLSTARTBLOCK(bno));
3930 agno = XFS_FSB_TO_AGNO(mp, bno);
3931 agbno = XFS_FSB_TO_AGBNO(mp, bno);
3932 ASSERT(agno < mp->m_sb.sb_agcount);
3933 ASSERT(agbno < mp->m_sb.sb_agblocks);
3934 ASSERT(len < mp->m_sb.sb_agblocks);
3935 ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
3936#endif
3937 ASSERT(xfs_bmap_free_item_zone != NULL);
3938 new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
3939 new->xbfi_startblock = bno;
3940 new->xbfi_blockcount = (xfs_extlen_t)len;
3941 for (prev = NULL, cur = flist->xbf_first;
3942 cur != NULL;
3943 prev = cur, cur = cur->xbfi_next) {
3944 if (cur->xbfi_startblock >= bno)
3945 break;
3946 }
3947 if (prev)
3948 prev->xbfi_next = new;
3949 else
3950 flist->xbf_first = new;
3951 new->xbfi_next = cur;
3952 flist->xbf_count++;
3953}
3954
3955/*
3956 * Compute and fill in the value of the maximum depth of a bmap btree
3957 * in this filesystem. Done once, during mount.
3958 */
3959void
3960xfs_bmap_compute_maxlevels(
3961 xfs_mount_t *mp, /* file system mount structure */
3962 int whichfork) /* data or attr fork */
3963{
3964 int level; /* btree level */
3965 uint maxblocks; /* max blocks at this level */
3966 uint maxleafents; /* max leaf entries possible */
3967 int maxrootrecs; /* max records in root block */
3968 int minleafrecs; /* min records in leaf block */
3969 int minnoderecs; /* min records in node block */
3970 int sz; /* root block size */
3971
3972 /*
3973 * The maximum number of extents in a file, hence the maximum
3974 * number of leaf entries, is controlled by the type of di_nextents
3975 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
3976 * (a signed 16-bit number, xfs_aextnum_t).
3977 */
3978 maxleafents = (whichfork == XFS_DATA_FORK) ? MAXEXTNUM : MAXAEXTNUM;
3979 minleafrecs = mp->m_bmap_dmnr[0];
3980 minnoderecs = mp->m_bmap_dmnr[1];
3981 sz = (whichfork == XFS_DATA_FORK) ?
3982 mp->m_attroffset :
3983 mp->m_sb.sb_inodesize - mp->m_attroffset;
3984 maxrootrecs = (int)XFS_BTREE_BLOCK_MAXRECS(sz, xfs_bmdr, 0);
3985 maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
3986 for (level = 1; maxblocks > 1; level++) {
3987 if (maxblocks <= maxrootrecs)
3988 maxblocks = 1;
3989 else
3990 maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
3991 }
3992 mp->m_bm_maxlevels[whichfork] = level;
3993}
3994
3995/*
3996 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
3997 * caller. Frees all the extents that need freeing, which must be done
3998 * last due to locking considerations. We never free any extents in
3999 * the first transaction. This is to allow the caller to make the first
4000 * transaction a synchronous one so that the pointers to the data being
4001 * broken in this transaction will be permanent before the data is actually
4002 * freed. This is necessary to prevent blocks from being reallocated
4003 * and written to before the free and reallocation are actually permanent.
4004 * We do not just make the first transaction synchronous here, because
4005 * there are more efficient ways to gain the same protection in some cases
4006 * (see the file truncation code).
4007 *
4008 * Return 1 if the given transaction was committed and a new one
4009 * started, and 0 otherwise in the committed parameter.
4010 */
4011/*ARGSUSED*/
4012int /* error */
4013xfs_bmap_finish(
4014 xfs_trans_t **tp, /* transaction pointer addr */
4015 xfs_bmap_free_t *flist, /* i/o: list extents to free */
4016 xfs_fsblock_t firstblock, /* controlled ag for allocs */
4017 int *committed) /* xact committed or not */
4018{
4019 xfs_efd_log_item_t *efd; /* extent free data */
4020 xfs_efi_log_item_t *efi; /* extent free intention */
4021 int error; /* error return value */
4022 xfs_bmap_free_item_t *free; /* free extent list item */
4023 unsigned int logres; /* new log reservation */
4024 unsigned int logcount; /* new log count */
4025 xfs_mount_t *mp; /* filesystem mount structure */
4026 xfs_bmap_free_item_t *next; /* next item on free list */
4027 xfs_trans_t *ntp; /* new transaction pointer */
4028
4029 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
4030 if (flist->xbf_count == 0) {
4031 *committed = 0;
4032 return 0;
4033 }
4034 ntp = *tp;
4035 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
4036 for (free = flist->xbf_first; free; free = free->xbfi_next)
4037 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
4038 free->xbfi_blockcount);
4039 logres = ntp->t_log_res;
4040 logcount = ntp->t_log_count;
4041 ntp = xfs_trans_dup(*tp);
4042 error = xfs_trans_commit(*tp, 0, NULL);
4043 *tp = ntp;
4044 *committed = 1;
4045 /*
4046 * We have a new transaction, so we should return committed=1,
4047 * even though we're returning an error.
4048 */
4049 if (error) {
4050 return error;
4051 }
4052 if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
4053 logcount)))
4054 return error;
4055 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
4056 for (free = flist->xbf_first; free != NULL; free = next) {
4057 next = free->xbfi_next;
4058 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
4059 free->xbfi_blockcount))) {
4060 /*
4061 * The bmap free list will be cleaned up at a
4062 * higher level. The EFI will be canceled when
4063 * this transaction is aborted.
4064 * Need to force shutdown here to make sure it
4065 * happens, since this transaction may not be
4066 * dirty yet.
4067 */
4068 mp = ntp->t_mountp;
4069 if (!XFS_FORCED_SHUTDOWN(mp))
4070 xfs_force_shutdown(mp,
4071 (error == EFSCORRUPTED) ?
4072 XFS_CORRUPT_INCORE :
4073 XFS_METADATA_IO_ERROR);
4074 return error;
4075 }
4076 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
4077 free->xbfi_blockcount);
4078 xfs_bmap_del_free(flist, NULL, free);
4079 }
4080 return 0;
4081}
4082
4083/*
4084 * Free up any items left in the list.
4085 */
4086void
4087xfs_bmap_cancel(
4088 xfs_bmap_free_t *flist) /* list of bmap_free_items */
4089{
4090 xfs_bmap_free_item_t *free; /* free list item */
4091 xfs_bmap_free_item_t *next;
4092
4093 if (flist->xbf_count == 0)
4094 return;
4095 ASSERT(flist->xbf_first != NULL);
4096 for (free = flist->xbf_first; free; free = next) {
4097 next = free->xbfi_next;
4098 xfs_bmap_del_free(flist, NULL, free);
4099 }
4100 ASSERT(flist->xbf_count == 0);
4101}
4102
4103/*
4104 * Returns the file-relative block number of the first unused block(s)
4105 * in the file with at least "len" logically contiguous blocks free.
4106 * This is the lowest-address hole if the file has holes, else the first block
4107 * past the end of file.
4108 * Return 0 if the file is currently local (in-inode).
4109 */
4110int /* error */
4111xfs_bmap_first_unused(
4112 xfs_trans_t *tp, /* transaction pointer */
4113 xfs_inode_t *ip, /* incore inode */
4114 xfs_extlen_t len, /* size of hole to find */
4115 xfs_fileoff_t *first_unused, /* unused block */
4116 int whichfork) /* data or attr fork */
4117{
4118 xfs_bmbt_rec_t *base; /* base of extent array */
4119 xfs_bmbt_rec_t *ep; /* pointer to an extent entry */
4120 int error; /* error return value */
4121 xfs_ifork_t *ifp; /* inode fork pointer */
4122 xfs_fileoff_t lastaddr; /* last block number seen */
4123 xfs_fileoff_t lowest; /* lowest useful block */
4124 xfs_fileoff_t max; /* starting useful block */
4125 xfs_fileoff_t off; /* offset for this block */
4126 xfs_extnum_t nextents; /* number of extent entries */
4127
4128 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
4129 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
4130 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
4131 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4132 *first_unused = 0;
4133 return 0;
4134 }
4135 ifp = XFS_IFORK_PTR(ip, whichfork);
4136 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4137 (error = xfs_iread_extents(tp, ip, whichfork)))
4138 return error;
4139 lowest = *first_unused;
4140 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4141 base = &ifp->if_u1.if_extents[0];
4142 for (lastaddr = 0, max = lowest, ep = base;
4143 ep < &base[nextents];
4144 ep++) {
4145 off = xfs_bmbt_get_startoff(ep);
4146 /*
4147 * See if the hole before this extent will work.
4148 */
4149 if (off >= lowest + len && off - max >= len) {
4150 *first_unused = max;
4151 return 0;
4152 }
4153 lastaddr = off + xfs_bmbt_get_blockcount(ep);
4154 max = XFS_FILEOFF_MAX(lastaddr, lowest);
4155 }
4156 *first_unused = max;
4157 return 0;
4158}
4159
4160/*
4161 * Returns the file-relative block number of the last block + 1 before
4162 * last_block (input value) in the file.
4163 * This is not based on i_size, it is based on the extent list.
4164 * Returns 0 for local files, as they do not have an extent list.
4165 */
4166int /* error */
4167xfs_bmap_last_before(
4168 xfs_trans_t *tp, /* transaction pointer */
4169 xfs_inode_t *ip, /* incore inode */
4170 xfs_fileoff_t *last_block, /* last block */
4171 int whichfork) /* data or attr fork */
4172{
4173 xfs_fileoff_t bno; /* input file offset */
4174 int eof; /* hit end of file */
4175 xfs_bmbt_rec_t *ep; /* pointer to last extent */
4176 int error; /* error return value */
4177 xfs_bmbt_irec_t got; /* current extent value */
4178 xfs_ifork_t *ifp; /* inode fork pointer */
4179 xfs_extnum_t lastx; /* last extent used */
4180 xfs_bmbt_irec_t prev; /* previous extent value */
4181
4182 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4183 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4184 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4185 return XFS_ERROR(EIO);
4186 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4187 *last_block = 0;
4188 return 0;
4189 }
4190 ifp = XFS_IFORK_PTR(ip, whichfork);
4191 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4192 (error = xfs_iread_extents(tp, ip, whichfork)))
4193 return error;
4194 bno = *last_block - 1;
4195 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4196 &prev);
4197 if (eof || xfs_bmbt_get_startoff(ep) > bno) {
4198 if (prev.br_startoff == NULLFILEOFF)
4199 *last_block = 0;
4200 else
4201 *last_block = prev.br_startoff + prev.br_blockcount;
4202 }
4203 /*
4204 * Otherwise *last_block is already the right answer.
4205 */
4206 return 0;
4207}
4208
4209/*
4210 * Returns the file-relative block number of the first block past eof in
4211 * the file. This is not based on i_size, it is based on the extent list.
4212 * Returns 0 for local files, as they do not have an extent list.
4213 */
4214int /* error */
4215xfs_bmap_last_offset(
4216 xfs_trans_t *tp, /* transaction pointer */
4217 xfs_inode_t *ip, /* incore inode */
4218 xfs_fileoff_t *last_block, /* last block */
4219 int whichfork) /* data or attr fork */
4220{
4221 xfs_bmbt_rec_t *base; /* base of extent array */
4222 xfs_bmbt_rec_t *ep; /* pointer to last extent */
4223 int error; /* error return value */
4224 xfs_ifork_t *ifp; /* inode fork pointer */
4225 xfs_extnum_t nextents; /* number of extent entries */
4226
4227 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4228 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4229 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
4230 return XFS_ERROR(EIO);
4231 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4232 *last_block = 0;
4233 return 0;
4234 }
4235 ifp = XFS_IFORK_PTR(ip, whichfork);
4236 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4237 (error = xfs_iread_extents(tp, ip, whichfork)))
4238 return error;
4239 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4240 if (!nextents) {
4241 *last_block = 0;
4242 return 0;
4243 }
4244 base = &ifp->if_u1.if_extents[0];
4245 ASSERT(base != NULL);
4246 ep = &base[nextents - 1];
4247 *last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
4248 return 0;
4249}
4250
4251/*
4252 * Returns whether the selected fork of the inode has exactly one
4253 * block or not. For the data fork we check this matches di_size,
4254 * implying the file's range is 0..bsize-1.
4255 */
4256int /* 1=>1 block, 0=>otherwise */
4257xfs_bmap_one_block(
4258 xfs_inode_t *ip, /* incore inode */
4259 int whichfork) /* data or attr fork */
4260{
4261 xfs_bmbt_rec_t *ep; /* ptr to fork's extent */
4262 xfs_ifork_t *ifp; /* inode fork pointer */
4263 int rval; /* return value */
4264 xfs_bmbt_irec_t s; /* internal version of extent */
4265
4266#ifndef DEBUG
4267 if (whichfork == XFS_DATA_FORK)
4268 return ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize;
4269#endif /* !DEBUG */
4270 if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
4271 return 0;
4272 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
4273 return 0;
4274 ifp = XFS_IFORK_PTR(ip, whichfork);
4275 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
4276 ep = ifp->if_u1.if_extents;
4277 xfs_bmbt_get_all(ep, &s);
4278 rval = s.br_startoff == 0 && s.br_blockcount == 1;
4279 if (rval && whichfork == XFS_DATA_FORK)
4280 ASSERT(ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
4281 return rval;
4282}
4283
4284/*
4285 * Read in the extents to if_extents.
4286 * All inode fields are set up by caller, we just traverse the btree
4287 * and copy the records in. If the file system cannot contain unwritten
4288 * extents, the records are checked for no "state" flags.
4289 */
4290int /* error */
4291xfs_bmap_read_extents(
4292 xfs_trans_t *tp, /* transaction pointer */
4293 xfs_inode_t *ip, /* incore inode */
4294 int whichfork) /* data or attr fork */
4295{
4296 xfs_bmbt_block_t *block; /* current btree block */
4297 xfs_fsblock_t bno; /* block # of "block" */
4298 xfs_buf_t *bp; /* buffer for "block" */
4299 int error; /* error return value */
4300 xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */
4301#ifdef XFS_BMAP_TRACE
4302 static char fname[] = "xfs_bmap_read_extents";
4303#endif
4304 xfs_extnum_t i, j; /* index into the extents list */
4305 xfs_ifork_t *ifp; /* fork structure */
4306 int level; /* btree level, for checking */
4307 xfs_mount_t *mp; /* file system mount structure */
4308 xfs_bmbt_ptr_t *pp; /* pointer to block address */
4309 /* REFERENCED */
4310 xfs_extnum_t room; /* number of entries there's room for */
4311 xfs_bmbt_rec_t *trp; /* target record pointer */
4312
4313 bno = NULLFSBLOCK;
4314 mp = ip->i_mount;
4315 ifp = XFS_IFORK_PTR(ip, whichfork);
4316 exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
4317 XFS_EXTFMT_INODE(ip);
4318 block = ifp->if_broot;
4319 /*
4320 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
4321 */
4322 ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
4323 level = INT_GET(block->bb_level, ARCH_CONVERT);
4324 pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
4325 ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
4326 ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
4327 ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
4328 bno = INT_GET(*pp, ARCH_CONVERT);
4329 /*
4330 * Go down the tree until leaf level is reached, following the first
4331 * pointer (leftmost) at each level.
4332 */
4333 while (level-- > 0) {
4334 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4335 XFS_BMAP_BTREE_REF)))
4336 return error;
4337 block = XFS_BUF_TO_BMBT_BLOCK(bp);
4338 XFS_WANT_CORRUPTED_GOTO(
4339 XFS_BMAP_SANITY_CHECK(mp, block, level),
4340 error0);
4341 if (level == 0)
4342 break;
4343 pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
4344 1, mp->m_bmap_dmxr[1]);
4345 XFS_WANT_CORRUPTED_GOTO(
4346 XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)),
4347 error0);
4348 bno = INT_GET(*pp, ARCH_CONVERT);
4349 xfs_trans_brelse(tp, bp);
4350 }
4351 /*
4352 * Here with bp and block set to the leftmost leaf node in the tree.
4353 */
4354 room = ifp->if_bytes / (uint)sizeof(*trp);
4355 trp = ifp->if_u1.if_extents;
4356 i = 0;
4357 /*
4358 * Loop over all leaf nodes. Copy information to the extent list.
4359 */
4360 for (;;) {
4361 xfs_bmbt_rec_t *frp, *temp;
4362 xfs_fsblock_t nextbno;
4363 xfs_extnum_t num_recs;
4364
4365
4366 num_recs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
4367 if (unlikely(i + num_recs > room)) {
4368 ASSERT(i + num_recs <= room);
4369 xfs_fs_cmn_err(CE_WARN, ip->i_mount,
4370 "corrupt dinode %Lu, (btree extents). Unmount and run xfs_repair.",
4371 (unsigned long long) ip->i_ino);
4372 XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
4373 XFS_ERRLEVEL_LOW,
4374 ip->i_mount);
4375 goto error0;
4376 }
4377 XFS_WANT_CORRUPTED_GOTO(
4378 XFS_BMAP_SANITY_CHECK(mp, block, 0),
4379 error0);
4380 /*
4381 * Read-ahead the next leaf block, if any.
4382 */
4383 nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
4384 if (nextbno != NULLFSBLOCK)
4385 xfs_btree_reada_bufl(mp, nextbno, 1);
4386 /*
4387 * Copy records into the extent list.
4388 */
4389 frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
4390 block, 1, mp->m_bmap_dmxr[0]);
4391 temp = trp;
4392 for (j = 0; j < num_recs; j++, frp++, trp++) {
4393 trp->l0 = INT_GET(frp->l0, ARCH_CONVERT);
4394 trp->l1 = INT_GET(frp->l1, ARCH_CONVERT);
4395 }
4396 if (exntf == XFS_EXTFMT_NOSTATE) {
4397 /*
4398 * Check all attribute bmap btree records and
4399 * any "older" data bmap btree records for a
4400 * set bit in the "extent flag" position.
4401 */
4402 if (unlikely(xfs_check_nostate_extents(temp, num_recs))) {
4403 XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
4404 XFS_ERRLEVEL_LOW,
4405 ip->i_mount);
4406 goto error0;
4407 }
4408 }
4409 i += num_recs;
4410 xfs_trans_brelse(tp, bp);
4411 bno = nextbno;
4412 /*
4413 * If we've reached the end, stop.
4414 */
4415 if (bno == NULLFSBLOCK)
4416 break;
4417 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
4418 XFS_BMAP_BTREE_REF)))
4419 return error;
4420 block = XFS_BUF_TO_BMBT_BLOCK(bp);
4421 }
4422 ASSERT(i == ifp->if_bytes / (uint)sizeof(*trp));
4423 ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
4424 xfs_bmap_trace_exlist(fname, ip, i, whichfork);
4425 return 0;
4426error0:
4427 xfs_trans_brelse(tp, bp);
4428 return XFS_ERROR(EFSCORRUPTED);
4429}
4430
4431#ifdef XFS_BMAP_TRACE
4432/*
4433 * Add bmap trace insert entries for all the contents of the extent list.
4434 */
4435void
4436xfs_bmap_trace_exlist(
4437 char *fname, /* function name */
4438 xfs_inode_t *ip, /* incore inode pointer */
4439 xfs_extnum_t cnt, /* count of entries in the list */
4440 int whichfork) /* data or attr fork */
4441{
4442 xfs_bmbt_rec_t *base; /* base of extent list */
4443 xfs_bmbt_rec_t *ep; /* current entry in extent list */
4444 xfs_extnum_t idx; /* extent list entry number */
4445 xfs_ifork_t *ifp; /* inode fork pointer */
4446 xfs_bmbt_irec_t s; /* extent list record */
4447
4448 ifp = XFS_IFORK_PTR(ip, whichfork);
4449 ASSERT(cnt == ifp->if_bytes / (uint)sizeof(*base));
4450 base = ifp->if_u1.if_extents;
4451 for (idx = 0, ep = base; idx < cnt; idx++, ep++) {
4452 xfs_bmbt_get_all(ep, &s);
4453 xfs_bmap_trace_insert(fname, "exlist", ip, idx, 1, &s, NULL,
4454 whichfork);
4455 }
4456}
4457#endif
4458
4459#ifdef DEBUG
4460/*
4461 * Validate that the bmbt_irecs being returned from bmapi are valid
4462 * given the callers original parameters. Specifically check the
4463 * ranges of the returned irecs to ensure that they only extent beyond
4464 * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
4465 */
4466STATIC void
4467xfs_bmap_validate_ret(
4468 xfs_fileoff_t bno,
4469 xfs_filblks_t len,
4470 int flags,
4471 xfs_bmbt_irec_t *mval,
4472 int nmap,
4473 int ret_nmap)
4474{
4475 int i; /* index to map values */
4476
4477 ASSERT(ret_nmap <= nmap);
4478
4479 for (i = 0; i < ret_nmap; i++) {
4480 ASSERT(mval[i].br_blockcount > 0);
4481 if (!(flags & XFS_BMAPI_ENTIRE)) {
4482 ASSERT(mval[i].br_startoff >= bno);
4483 ASSERT(mval[i].br_blockcount <= len);
4484 ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
4485 bno + len);
4486 } else {
4487 ASSERT(mval[i].br_startoff < bno + len);
4488 ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
4489 bno);
4490 }
4491 ASSERT(i == 0 ||
4492 mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
4493 mval[i].br_startoff);
4494 if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
4495 ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
4496 mval[i].br_startblock != HOLESTARTBLOCK);
4497 ASSERT(mval[i].br_state == XFS_EXT_NORM ||
4498 mval[i].br_state == XFS_EXT_UNWRITTEN);
4499 }
4500}
4501#endif /* DEBUG */
4502
4503
4504/*
4505 * Map file blocks to filesystem blocks.
4506 * File range is given by the bno/len pair.
4507 * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
4508 * into a hole or past eof.
4509 * Only allocates blocks from a single allocation group,
4510 * to avoid locking problems.
4511 * The returned value in "firstblock" from the first call in a transaction
4512 * must be remembered and presented to subsequent calls in "firstblock".
4513 * An upper bound for the number of blocks to be allocated is supplied to
4514 * the first call in "total"; if no allocation group has that many free
4515 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
4516 */
4517int /* error */
4518xfs_bmapi(
4519 xfs_trans_t *tp, /* transaction pointer */
4520 xfs_inode_t *ip, /* incore inode */
4521 xfs_fileoff_t bno, /* starting file offs. mapped */
4522 xfs_filblks_t len, /* length to map in file */
4523 int flags, /* XFS_BMAPI_... */
4524 xfs_fsblock_t *firstblock, /* first allocated block
4525 controls a.g. for allocs */
4526 xfs_extlen_t total, /* total blocks needed */
4527 xfs_bmbt_irec_t *mval, /* output: map values */
4528 int *nmap, /* i/o: mval size/count */
4529 xfs_bmap_free_t *flist) /* i/o: list extents to free */
4530{
4531 xfs_fsblock_t abno; /* allocated block number */
4532 xfs_extlen_t alen; /* allocated extent length */
4533 xfs_fileoff_t aoff; /* allocated file offset */
4534 xfs_bmalloca_t bma; /* args for xfs_bmap_alloc */
4535 char contig; /* allocation must be one extent */
4536 xfs_btree_cur_t *cur; /* bmap btree cursor */
4537 char delay; /* this request is for delayed alloc */
4538 xfs_fileoff_t end; /* end of mapped file region */
4539 int eof; /* we've hit the end of extent list */
4540 xfs_bmbt_rec_t *ep; /* extent list entry pointer */
4541 int error; /* error return */
4542 char exact; /* don't do all of wasdelayed extent */
4543 xfs_bmbt_irec_t got; /* current extent list record */
4544 xfs_ifork_t *ifp; /* inode fork pointer */
4545 xfs_extlen_t indlen; /* indirect blocks length */
4546 char inhole; /* current location is hole in file */
4547 xfs_extnum_t lastx; /* last useful extent number */
4548 int logflags; /* flags for transaction logging */
4549 xfs_extlen_t minleft; /* min blocks left after allocation */
4550 xfs_extlen_t minlen; /* min allocation size */
4551 xfs_mount_t *mp; /* xfs mount structure */
4552 int n; /* current extent index */
4553 int nallocs; /* number of extents alloc\'d */
4554 xfs_extnum_t nextents; /* number of extents in file */
4555 xfs_fileoff_t obno; /* old block number (offset) */
4556 xfs_bmbt_irec_t prev; /* previous extent list record */
4557 char stateless; /* ignore state flag set */
4558 int tmp_logflags; /* temp flags holder */
4559 char trim; /* output trimmed to match range */
4560 char userdata; /* allocating non-metadata */
4561 char wasdelay; /* old extent was delayed */
4562 int whichfork; /* data or attr fork */
4563 char wr; /* this is a write request */
4564 char rsvd; /* OK to allocate reserved blocks */
4565#ifdef DEBUG
4566 xfs_fileoff_t orig_bno; /* original block number value */
4567 int orig_flags; /* original flags arg value */
4568 xfs_filblks_t orig_len; /* original value of len arg */
4569 xfs_bmbt_irec_t *orig_mval; /* original value of mval */
4570 int orig_nmap; /* original value of *nmap */
4571
4572 orig_bno = bno;
4573 orig_len = len;
4574 orig_flags = flags;
4575 orig_mval = mval;
4576 orig_nmap = *nmap;
4577#endif
4578 ASSERT(*nmap >= 1);
4579 ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
4580 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
4581 XFS_ATTR_FORK : XFS_DATA_FORK;
4582 mp = ip->i_mount;
4583 if (unlikely(XFS_TEST_ERROR(
4584 (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
4585 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
4586 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
4587 mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
4588 XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
4589 return XFS_ERROR(EFSCORRUPTED);
4590 }
4591 if (XFS_FORCED_SHUTDOWN(mp))
4592 return XFS_ERROR(EIO);
4593 ifp = XFS_IFORK_PTR(ip, whichfork);
4594 ASSERT(ifp->if_ext_max ==
4595 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
4596 if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
4597 XFS_STATS_INC(xs_blk_mapw);
4598 else
4599 XFS_STATS_INC(xs_blk_mapr);
4600 delay = (flags & XFS_BMAPI_DELAY) != 0;
4601 trim = (flags & XFS_BMAPI_ENTIRE) == 0;
4602 userdata = (flags & XFS_BMAPI_METADATA) == 0;
4603 exact = (flags & XFS_BMAPI_EXACT) != 0;
4604 rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
4605 contig = (flags & XFS_BMAPI_CONTIG) != 0;
4606 /*
4607 * stateless is used to combine extents which
4608 * differ only due to the state of the extents.
4609 * This technique is used from xfs_getbmap()
4610 * when the caller does not wish to see the
4611 * separation (which is the default).
4612 *
4613 * This technique is also used when writing a
4614 * buffer which has been partially written,
4615 * (usually by being flushed during a chunkread),
4616 * to ensure one write takes place. This also
4617 * prevents a change in the xfs inode extents at
4618 * this time, intentionally. This change occurs
4619 * on completion of the write operation, in
4620 * xfs_strat_comp(), where the xfs_bmapi() call
4621 * is transactioned, and the extents combined.
4622 */
4623 stateless = (flags & XFS_BMAPI_IGSTATE) != 0;
4624 if (stateless && wr) /* if writing unwritten space, no */
4625 wr = 0; /* allocations are allowed */
4626 ASSERT(wr || !delay);
4627 logflags = 0;
4628 nallocs = 0;
4629 cur = NULL;
4630 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
4631 ASSERT(wr && tp);
4632 if ((error = xfs_bmap_local_to_extents(tp, ip,
4633 firstblock, total, &logflags, whichfork)))
4634 goto error0;
4635 }
4636 if (wr && *firstblock == NULLFSBLOCK) {
4637 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
4638 minleft = INT_GET(ifp->if_broot->bb_level, ARCH_CONVERT) + 1;
4639 else
4640 minleft = 1;
4641 } else
4642 minleft = 0;
4643 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
4644 (error = xfs_iread_extents(tp, ip, whichfork)))
4645 goto error0;
4646 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
4647 &prev);
4648 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4649 n = 0;
4650 end = bno + len;
4651 obno = bno;
4652 bma.ip = NULL;
4653 while (bno < end && n < *nmap) {
4654 /*
4655 * Reading past eof, act as though there's a hole
4656 * up to end.
4657 */
4658 if (eof && !wr)
4659 got.br_startoff = end;
4660 inhole = eof || got.br_startoff > bno;
4661 wasdelay = wr && !inhole && !delay &&
4662 ISNULLSTARTBLOCK(got.br_startblock);
4663 /*
4664 * First, deal with the hole before the allocated space
4665 * that we found, if any.
4666 */
4667 if (wr && (inhole || wasdelay)) {
4668 /*
4669 * For the wasdelay case, we could also just
4670 * allocate the stuff asked for in this bmap call
4671 * but that wouldn't be as good.
4672 */
4673 if (wasdelay && !exact) {
4674 alen = (xfs_extlen_t)got.br_blockcount;
4675 aoff = got.br_startoff;
4676 if (lastx != NULLEXTNUM && lastx) {
4677 ep = &ifp->if_u1.if_extents[lastx - 1];
4678 xfs_bmbt_get_all(ep, &prev);
4679 }
4680 } else if (wasdelay) {
4681 alen = (xfs_extlen_t)
4682 XFS_FILBLKS_MIN(len,
4683 (got.br_startoff +
4684 got.br_blockcount) - bno);
4685 aoff = bno;
4686 } else {
4687 alen = (xfs_extlen_t)
4688 XFS_FILBLKS_MIN(len, MAXEXTLEN);
4689 if (!eof)
4690 alen = (xfs_extlen_t)
4691 XFS_FILBLKS_MIN(alen,
4692 got.br_startoff - bno);
4693 aoff = bno;
4694 }
4695 minlen = contig ? alen : 1;
4696 if (delay) {
4697 indlen = (xfs_extlen_t)
4698 xfs_bmap_worst_indlen(ip, alen);
4699 ASSERT(indlen > 0);
4700 /*
4701 * Make a transaction-less quota reservation for
4702 * delayed allocation blocks. This number gets
4703 * adjusted later.
4704 * We return EDQUOT if we haven't allocated
4705 * blks already inside this loop;
4706 */
4707 if (XFS_TRANS_RESERVE_BLKQUOTA(
4708 mp, NULL, ip, (long)alen)) {
4709 if (n == 0) {
4710 *nmap = 0;
4711 ASSERT(cur == NULL);
4712 return XFS_ERROR(EDQUOT);
4713 }
4714 break;
4715 }
4716
4717 /*
4718 * Split changing sb for alen and indlen since
4719 * they could be coming from different places.
4720 */
4721 if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) {
4722 xfs_extlen_t extsz;
4723 xfs_extlen_t ralen;
4724 if (!(extsz = ip->i_d.di_extsize))
4725 extsz = mp->m_sb.sb_rextsize;
4726 ralen = roundup(alen, extsz);
4727 ralen = ralen / mp->m_sb.sb_rextsize;
4728 if (xfs_mod_incore_sb(mp,
4729 XFS_SBS_FREXTENTS,
4730 -(ralen), rsvd)) {
4731 if (XFS_IS_QUOTA_ON(ip->i_mount))
4732 XFS_TRANS_UNRESERVE_BLKQUOTA(
4733 mp, NULL, ip,
4734 (long)alen);
4735 break;
4736 }
4737 } else {
4738 if (xfs_mod_incore_sb(mp,
4739 XFS_SBS_FDBLOCKS,
4740 -(alen), rsvd)) {
4741 if (XFS_IS_QUOTA_ON(ip->i_mount))
4742 XFS_TRANS_UNRESERVE_BLKQUOTA(
4743 mp, NULL, ip,
4744 (long)alen);
4745 break;
4746 }
4747 }
4748
4749 if (xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
4750 -(indlen), rsvd)) {
4751 XFS_TRANS_UNRESERVE_BLKQUOTA(
4752 mp, NULL, ip, (long)alen);
4753 break;
4754 }
4755 ip->i_delayed_blks += alen;
4756 abno = NULLSTARTBLOCK(indlen);
4757 } else {
4758 /*
4759 * If first time, allocate and fill in
4760 * once-only bma fields.
4761 */
4762 if (bma.ip == NULL) {
4763 bma.tp = tp;
4764 bma.ip = ip;
4765 bma.prevp = &prev;
4766 bma.gotp = &got;
4767 bma.total = total;
4768 bma.userdata = 0;
4769 }
4770 /* Indicate if this is the first user data
4771 * in the file, or just any user data.
4772 */
4773 if (userdata) {
4774 bma.userdata = (aoff == 0) ?
4775 XFS_ALLOC_INITIAL_USER_DATA :
4776 XFS_ALLOC_USERDATA;
4777 }
4778 /*
4779 * Fill in changeable bma fields.
4780 */
4781 bma.eof = eof;
4782 bma.firstblock = *firstblock;
4783 bma.alen = alen;
4784 bma.off = aoff;
4785 bma.wasdel = wasdelay;
4786 bma.minlen = minlen;
4787 bma.low = flist->xbf_low;
4788 bma.minleft = minleft;
4789 /*
4790 * Only want to do the alignment at the
4791 * eof if it is userdata and allocation length
4792 * is larger than a stripe unit.
4793 */
4794 if (mp->m_dalign && alen >= mp->m_dalign &&
4795 userdata && whichfork == XFS_DATA_FORK) {
4796 if ((error = xfs_bmap_isaeof(ip, aoff,
4797 whichfork, &bma.aeof)))
4798 goto error0;
4799 } else
4800 bma.aeof = 0;
4801 /*
4802 * Call allocator.
4803 */
4804 if ((error = xfs_bmap_alloc(&bma)))
4805 goto error0;
4806 /*
4807 * Copy out result fields.
4808 */
4809 abno = bma.rval;
4810 if ((flist->xbf_low = bma.low))
4811 minleft = 0;
4812 alen = bma.alen;
4813 aoff = bma.off;
4814 ASSERT(*firstblock == NULLFSBLOCK ||
4815 XFS_FSB_TO_AGNO(mp, *firstblock) ==
4816 XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
4817 (flist->xbf_low &&
4818 XFS_FSB_TO_AGNO(mp, *firstblock) <
4819 XFS_FSB_TO_AGNO(mp, bma.firstblock)));
4820 *firstblock = bma.firstblock;
4821 if (cur)
4822 cur->bc_private.b.firstblock =
4823 *firstblock;
4824 if (abno == NULLFSBLOCK)
4825 break;
4826 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
4827 cur = xfs_btree_init_cursor(mp,
4828 tp, NULL, 0, XFS_BTNUM_BMAP,
4829 ip, whichfork);
4830 cur->bc_private.b.firstblock =
4831 *firstblock;
4832 cur->bc_private.b.flist = flist;
4833 }
4834 /*
4835 * Bump the number of extents we've allocated
4836 * in this call.
4837 */
4838 nallocs++;
4839 }
4840 if (cur)
4841 cur->bc_private.b.flags =
4842 wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
4843 got.br_startoff = aoff;
4844 got.br_startblock = abno;
4845 got.br_blockcount = alen;
4846 got.br_state = XFS_EXT_NORM; /* assume normal */
4847 /*
4848 * Determine state of extent, and the filesystem.
4849 * A wasdelay extent has been initialized, so
4850 * shouldn't be flagged as unwritten.
4851 */
4852 if (wr && XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
4853 if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
4854 got.br_state = XFS_EXT_UNWRITTEN;
4855 }
4856 error = xfs_bmap_add_extent(ip, lastx, &cur, &got,
4857 firstblock, flist, &tmp_logflags, whichfork,
4858 rsvd);
4859 logflags |= tmp_logflags;
4860 if (error)
4861 goto error0;
4862 lastx = ifp->if_lastex;
4863 ep = &ifp->if_u1.if_extents[lastx];
4864 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4865 xfs_bmbt_get_all(ep, &got);
4866 ASSERT(got.br_startoff <= aoff);
4867 ASSERT(got.br_startoff + got.br_blockcount >=
4868 aoff + alen);
4869#ifdef DEBUG
4870 if (delay) {
4871 ASSERT(ISNULLSTARTBLOCK(got.br_startblock));
4872 ASSERT(STARTBLOCKVAL(got.br_startblock) > 0);
4873 }
4874 ASSERT(got.br_state == XFS_EXT_NORM ||
4875 got.br_state == XFS_EXT_UNWRITTEN);
4876#endif
4877 /*
4878 * Fall down into the found allocated space case.
4879 */
4880 } else if (inhole) {
4881 /*
4882 * Reading in a hole.
4883 */
4884 mval->br_startoff = bno;
4885 mval->br_startblock = HOLESTARTBLOCK;
4886 mval->br_blockcount =
4887 XFS_FILBLKS_MIN(len, got.br_startoff - bno);
4888 mval->br_state = XFS_EXT_NORM;
4889 bno += mval->br_blockcount;
4890 len -= mval->br_blockcount;
4891 mval++;
4892 n++;
4893 continue;
4894 }
4895 /*
4896 * Then deal with the allocated space we found.
4897 */
4898 ASSERT(ep != NULL);
4899 if (trim && (got.br_startoff + got.br_blockcount > obno)) {
4900 if (obno > bno)
4901 bno = obno;
4902 ASSERT((bno >= obno) || (n == 0));
4903 ASSERT(bno < end);
4904 mval->br_startoff = bno;
4905 if (ISNULLSTARTBLOCK(got.br_startblock)) {
4906 ASSERT(!wr || delay);
4907 mval->br_startblock = DELAYSTARTBLOCK;
4908 } else
4909 mval->br_startblock =
4910 got.br_startblock +
4911 (bno - got.br_startoff);
4912 /*
4913 * Return the minimum of what we got and what we
4914 * asked for for the length. We can use the len
4915 * variable here because it is modified below
4916 * and we could have been there before coming
4917 * here if the first part of the allocation
4918 * didn't overlap what was asked for.
4919 */
4920 mval->br_blockcount =
4921 XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
4922 (bno - got.br_startoff));
4923 mval->br_state = got.br_state;
4924 ASSERT(mval->br_blockcount <= len);
4925 } else {
4926 *mval = got;
4927 if (ISNULLSTARTBLOCK(mval->br_startblock)) {
4928 ASSERT(!wr || delay);
4929 mval->br_startblock = DELAYSTARTBLOCK;
4930 }
4931 }
4932
4933 /*
4934 * Check if writing previously allocated but
4935 * unwritten extents.
4936 */
4937 if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
4938 ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
4939 /*
4940 * Modify (by adding) the state flag, if writing.
4941 */
4942 ASSERT(mval->br_blockcount <= len);
4943 if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
4944 cur = xfs_btree_init_cursor(mp,
4945 tp, NULL, 0, XFS_BTNUM_BMAP,
4946 ip, whichfork);
4947 cur->bc_private.b.firstblock =
4948 *firstblock;
4949 cur->bc_private.b.flist = flist;
4950 }
4951 mval->br_state = XFS_EXT_NORM;
4952 error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
4953 firstblock, flist, &tmp_logflags, whichfork,
4954 rsvd);
4955 logflags |= tmp_logflags;
4956 if (error)
4957 goto error0;
4958 lastx = ifp->if_lastex;
4959 ep = &ifp->if_u1.if_extents[lastx];
4960 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
4961 xfs_bmbt_get_all(ep, &got);
4962 /*
4963 * We may have combined previously unwritten
4964 * space with written space, so generate
4965 * another request.
4966 */
4967 if (mval->br_blockcount < len)
4968 continue;
4969 }
4970
4971 ASSERT(!trim ||
4972 ((mval->br_startoff + mval->br_blockcount) <= end));
4973 ASSERT(!trim || (mval->br_blockcount <= len) ||
4974 (mval->br_startoff < obno));
4975 bno = mval->br_startoff + mval->br_blockcount;
4976 len = end - bno;
4977 if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
4978 ASSERT(mval->br_startblock == mval[-1].br_startblock);
4979 ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
4980 ASSERT(mval->br_state == mval[-1].br_state);
4981 mval[-1].br_blockcount = mval->br_blockcount;
4982 mval[-1].br_state = mval->br_state;
4983 } else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
4984 mval[-1].br_startblock != DELAYSTARTBLOCK &&
4985 mval[-1].br_startblock != HOLESTARTBLOCK &&
4986 mval->br_startblock ==
4987 mval[-1].br_startblock + mval[-1].br_blockcount &&
4988 (stateless || mval[-1].br_state == mval->br_state)) {
4989 ASSERT(mval->br_startoff ==
4990 mval[-1].br_startoff + mval[-1].br_blockcount);
4991 mval[-1].br_blockcount += mval->br_blockcount;
4992 } else if (n > 0 &&
4993 mval->br_startblock == DELAYSTARTBLOCK &&
4994 mval[-1].br_startblock == DELAYSTARTBLOCK &&
4995 mval->br_startoff ==
4996 mval[-1].br_startoff + mval[-1].br_blockcount) {
4997 mval[-1].br_blockcount += mval->br_blockcount;
4998 mval[-1].br_state = mval->br_state;
4999 } else if (!((n == 0) &&
5000 ((mval->br_startoff + mval->br_blockcount) <=
5001 obno))) {
5002 mval++;
5003 n++;
5004 }
5005 /*
5006 * If we're done, stop now. Stop when we've allocated
5007 * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
5008 * the transaction may get too big.
5009 */
5010 if (bno >= end || n >= *nmap || nallocs >= *nmap)
5011 break;
5012 /*
5013 * Else go on to the next record.
5014 */
5015 ep++;
5016 lastx++;
5017 if (lastx >= nextents) {
5018 eof = 1;
5019 prev = got;
5020 } else
5021 xfs_bmbt_get_all(ep, &got);
5022 }
5023 ifp->if_lastex = lastx;
5024 *nmap = n;
5025 /*
5026 * Transform from btree to extents, give it cur.
5027 */
5028 if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5029 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5030 ASSERT(wr && cur);
5031 error = xfs_bmap_btree_to_extents(tp, ip, cur,
5032 &tmp_logflags, whichfork);
5033 logflags |= tmp_logflags;
5034 if (error)
5035 goto error0;
5036 }
5037 ASSERT(ifp->if_ext_max ==
5038 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5039 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
5040 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
5041 error = 0;
5042
5043error0:
5044 /*
5045 * Log everything. Do this after conversion, there's no point in
5046 * logging the extent list if we've converted to btree format.
5047 */
5048 if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
5049 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5050 logflags &= ~XFS_ILOG_FEXT(whichfork);
5051 else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
5052 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5053 logflags &= ~XFS_ILOG_FBROOT(whichfork);
5054 /*
5055 * Log whatever the flags say, even if error. Otherwise we might miss
5056 * detecting a case where the data is changed, there's an error,
5057 * and it's not logged so we don't shutdown when we should.
5058 */
5059 if (logflags) {
5060 ASSERT(tp && wr);
5061 xfs_trans_log_inode(tp, ip, logflags);
5062 }
5063 if (cur) {
5064 if (!error) {
5065 ASSERT(*firstblock == NULLFSBLOCK ||
5066 XFS_FSB_TO_AGNO(mp, *firstblock) ==
5067 XFS_FSB_TO_AGNO(mp,
5068 cur->bc_private.b.firstblock) ||
5069 (flist->xbf_low &&
5070 XFS_FSB_TO_AGNO(mp, *firstblock) <
5071 XFS_FSB_TO_AGNO(mp,
5072 cur->bc_private.b.firstblock)));
5073 *firstblock = cur->bc_private.b.firstblock;
5074 }
5075 xfs_btree_del_cursor(cur,
5076 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5077 }
5078 if (!error)
5079 xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
5080 orig_nmap, *nmap);
5081 return error;
5082}
5083
5084/*
5085 * Map file blocks to filesystem blocks, simple version.
5086 * One block (extent) only, read-only.
5087 * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
5088 * For the other flag values, the effect is as if XFS_BMAPI_METADATA
5089 * was set and all the others were clear.
5090 */
5091int /* error */
5092xfs_bmapi_single(
5093 xfs_trans_t *tp, /* transaction pointer */
5094 xfs_inode_t *ip, /* incore inode */
5095 int whichfork, /* data or attr fork */
5096 xfs_fsblock_t *fsb, /* output: mapped block */
5097 xfs_fileoff_t bno) /* starting file offs. mapped */
5098{
5099 int eof; /* we've hit the end of extent list */
5100 int error; /* error return */
5101 xfs_bmbt_irec_t got; /* current extent list record */
5102 xfs_ifork_t *ifp; /* inode fork pointer */
5103 xfs_extnum_t lastx; /* last useful extent number */
5104 xfs_bmbt_irec_t prev; /* previous extent list record */
5105
5106 ifp = XFS_IFORK_PTR(ip, whichfork);
5107 if (unlikely(
5108 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
5109 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
5110 XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
5111 ip->i_mount);
5112 return XFS_ERROR(EFSCORRUPTED);
5113 }
5114 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
5115 return XFS_ERROR(EIO);
5116 XFS_STATS_INC(xs_blk_mapr);
5117 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5118 (error = xfs_iread_extents(tp, ip, whichfork)))
5119 return error;
5120 (void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5121 &prev);
5122 /*
5123 * Reading past eof, act as though there's a hole
5124 * up to end.
5125 */
5126 if (eof || got.br_startoff > bno) {
5127 *fsb = NULLFSBLOCK;
5128 return 0;
5129 }
5130 ASSERT(!ISNULLSTARTBLOCK(got.br_startblock));
5131 ASSERT(bno < got.br_startoff + got.br_blockcount);
5132 *fsb = got.br_startblock + (bno - got.br_startoff);
5133 ifp->if_lastex = lastx;
5134 return 0;
5135}
5136
5137/*
5138 * Unmap (remove) blocks from a file.
5139 * If nexts is nonzero then the number of extents to remove is limited to
5140 * that value. If not all extents in the block range can be removed then
5141 * *done is set.
5142 */
5143int /* error */
5144xfs_bunmapi(
5145 xfs_trans_t *tp, /* transaction pointer */
5146 struct xfs_inode *ip, /* incore inode */
5147 xfs_fileoff_t bno, /* starting offset to unmap */
5148 xfs_filblks_t len, /* length to unmap in file */
5149 int flags, /* misc flags */
5150 xfs_extnum_t nexts, /* number of extents max */
5151 xfs_fsblock_t *firstblock, /* first allocated block
5152 controls a.g. for allocs */
5153 xfs_bmap_free_t *flist, /* i/o: list extents to free */
5154 int *done) /* set if not done yet */
5155{
5156 xfs_btree_cur_t *cur; /* bmap btree cursor */
5157 xfs_bmbt_irec_t del; /* extent being deleted */
5158 int eof; /* is deleting at eof */
5159 xfs_bmbt_rec_t *ep; /* extent list entry pointer */
5160 int error; /* error return value */
5161 xfs_extnum_t extno; /* extent number in list */
5162 xfs_bmbt_irec_t got; /* current extent list entry */
5163 xfs_ifork_t *ifp; /* inode fork pointer */
5164 int isrt; /* freeing in rt area */
5165 xfs_extnum_t lastx; /* last extent index used */
5166 int logflags; /* transaction logging flags */
5167 xfs_extlen_t mod; /* rt extent offset */
5168 xfs_mount_t *mp; /* mount structure */
5169 xfs_extnum_t nextents; /* size of extent list */
5170 xfs_bmbt_irec_t prev; /* previous extent list entry */
5171 xfs_fileoff_t start; /* first file offset deleted */
5172 int tmp_logflags; /* partial logging flags */
5173 int wasdel; /* was a delayed alloc extent */
5174 int whichfork; /* data or attribute fork */
5175 int rsvd; /* OK to allocate reserved blocks */
5176 xfs_fsblock_t sum;
5177
5178 xfs_bunmap_trace(ip, bno, len, flags, (inst_t *)__return_address);
5179 whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
5180 XFS_ATTR_FORK : XFS_DATA_FORK;
5181 ifp = XFS_IFORK_PTR(ip, whichfork);
5182 if (unlikely(
5183 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
5184 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
5185 XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
5186 ip->i_mount);
5187 return XFS_ERROR(EFSCORRUPTED);
5188 }
5189 mp = ip->i_mount;
5190 if (XFS_FORCED_SHUTDOWN(mp))
5191 return XFS_ERROR(EIO);
5192 rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
5193 ASSERT(len > 0);
5194 ASSERT(nexts >= 0);
5195 ASSERT(ifp->if_ext_max ==
5196 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5197 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5198 (error = xfs_iread_extents(tp, ip, whichfork)))
5199 return error;
5200 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5201 if (nextents == 0) {
5202 *done = 1;
5203 return 0;
5204 }
5205 XFS_STATS_INC(xs_blk_unmap);
5206 isrt = (whichfork == XFS_DATA_FORK) &&
5207 (ip->i_d.di_flags & XFS_DIFLAG_REALTIME);
5208 start = bno;
5209 bno = start + len - 1;
5210 ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
5211 &prev);
5212 /*
5213 * Check to see if the given block number is past the end of the
5214 * file, back up to the last block if so...
5215 */
5216 if (eof) {
5217 ep = &ifp->if_u1.if_extents[--lastx];
5218 xfs_bmbt_get_all(ep, &got);
5219 bno = got.br_startoff + got.br_blockcount - 1;
5220 }
5221 logflags = 0;
5222 if (ifp->if_flags & XFS_IFBROOT) {
5223 ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
5224 cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
5225 whichfork);
5226 cur->bc_private.b.firstblock = *firstblock;
5227 cur->bc_private.b.flist = flist;
5228 cur->bc_private.b.flags = 0;
5229 } else
5230 cur = NULL;
5231 extno = 0;
5232 while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
5233 (nexts == 0 || extno < nexts)) {
5234 /*
5235 * Is the found extent after a hole in which bno lives?
5236 * Just back up to the previous extent, if so.
5237 */
5238 if (got.br_startoff > bno) {
5239 if (--lastx < 0)
5240 break;
5241 ep--;
5242 xfs_bmbt_get_all(ep, &got);
5243 }
5244 /*
5245 * Is the last block of this extent before the range
5246 * we're supposed to delete? If so, we're done.
5247 */
5248 bno = XFS_FILEOFF_MIN(bno,
5249 got.br_startoff + got.br_blockcount - 1);
5250 if (bno < start)
5251 break;
5252 /*
5253 * Then deal with the (possibly delayed) allocated space
5254 * we found.
5255 */
5256 ASSERT(ep != NULL);
5257 del = got;
5258 wasdel = ISNULLSTARTBLOCK(del.br_startblock);
5259 if (got.br_startoff < start) {
5260 del.br_startoff = start;
5261 del.br_blockcount -= start - got.br_startoff;
5262 if (!wasdel)
5263 del.br_startblock += start - got.br_startoff;
5264 }
5265 if (del.br_startoff + del.br_blockcount > bno + 1)
5266 del.br_blockcount = bno + 1 - del.br_startoff;
5267 sum = del.br_startblock + del.br_blockcount;
5268 if (isrt &&
5269 (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
5270 /*
5271 * Realtime extent not lined up at the end.
5272 * The extent could have been split into written
5273 * and unwritten pieces, or we could just be
5274 * unmapping part of it. But we can't really
5275 * get rid of part of a realtime extent.
5276 */
5277 if (del.br_state == XFS_EXT_UNWRITTEN ||
5278 !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
5279 /*
5280 * This piece is unwritten, or we're not
5281 * using unwritten extents. Skip over it.
5282 */
5283 ASSERT(bno >= mod);
5284 bno -= mod > del.br_blockcount ?
5285 del.br_blockcount : mod;
5286 if (bno < got.br_startoff) {
5287 if (--lastx >= 0)
5288 xfs_bmbt_get_all(--ep, &got);
5289 }
5290 continue;
5291 }
5292 /*
5293 * It's written, turn it unwritten.
5294 * This is better than zeroing it.
5295 */
5296 ASSERT(del.br_state == XFS_EXT_NORM);
5297 ASSERT(xfs_trans_get_block_res(tp) > 0);
5298 /*
5299 * If this spans a realtime extent boundary,
5300 * chop it back to the start of the one we end at.
5301 */
5302 if (del.br_blockcount > mod) {
5303 del.br_startoff += del.br_blockcount - mod;
5304 del.br_startblock += del.br_blockcount - mod;
5305 del.br_blockcount = mod;
5306 }
5307 del.br_state = XFS_EXT_UNWRITTEN;
5308 error = xfs_bmap_add_extent(ip, lastx, &cur, &del,
5309 firstblock, flist, &logflags, XFS_DATA_FORK, 0);
5310 if (error)
5311 goto error0;
5312 goto nodelete;
5313 }
5314 if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
5315 /*
5316 * Realtime extent is lined up at the end but not
5317 * at the front. We'll get rid of full extents if
5318 * we can.
5319 */
5320 mod = mp->m_sb.sb_rextsize - mod;
5321 if (del.br_blockcount > mod) {
5322 del.br_blockcount -= mod;
5323 del.br_startoff += mod;
5324 del.br_startblock += mod;
5325 } else if ((del.br_startoff == start &&
5326 (del.br_state == XFS_EXT_UNWRITTEN ||
5327 xfs_trans_get_block_res(tp) == 0)) ||
5328 !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
5329 /*
5330 * Can't make it unwritten. There isn't
5331 * a full extent here so just skip it.
5332 */
5333 ASSERT(bno >= del.br_blockcount);
5334 bno -= del.br_blockcount;
5335 if (bno < got.br_startoff) {
5336 if (--lastx >= 0)
5337 xfs_bmbt_get_all(--ep, &got);
5338 }
5339 continue;
5340 } else if (del.br_state == XFS_EXT_UNWRITTEN) {
5341 /*
5342 * This one is already unwritten.
5343 * It must have a written left neighbor.
5344 * Unwrite the killed part of that one and
5345 * try again.
5346 */
5347 ASSERT(lastx > 0);
5348 xfs_bmbt_get_all(ep - 1, &prev);
5349 ASSERT(prev.br_state == XFS_EXT_NORM);
5350 ASSERT(!ISNULLSTARTBLOCK(prev.br_startblock));
5351 ASSERT(del.br_startblock ==
5352 prev.br_startblock + prev.br_blockcount);
5353 if (prev.br_startoff < start) {
5354 mod = start - prev.br_startoff;
5355 prev.br_blockcount -= mod;
5356 prev.br_startblock += mod;
5357 prev.br_startoff = start;
5358 }
5359 prev.br_state = XFS_EXT_UNWRITTEN;
5360 error = xfs_bmap_add_extent(ip, lastx - 1, &cur,
5361 &prev, firstblock, flist, &logflags,
5362 XFS_DATA_FORK, 0);
5363 if (error)
5364 goto error0;
5365 goto nodelete;
5366 } else {
5367 ASSERT(del.br_state == XFS_EXT_NORM);
5368 del.br_state = XFS_EXT_UNWRITTEN;
5369 error = xfs_bmap_add_extent(ip, lastx, &cur,
5370 &del, firstblock, flist, &logflags,
5371 XFS_DATA_FORK, 0);
5372 if (error)
5373 goto error0;
5374 goto nodelete;
5375 }
5376 }
5377 if (wasdel) {
5378 ASSERT(STARTBLOCKVAL(del.br_startblock) > 0);
5379 xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
5380 (int)del.br_blockcount, rsvd);
5381 /* Unreserve our quota space */
5382 XFS_TRANS_RESERVE_QUOTA_NBLKS(
5383 mp, NULL, ip, -((long)del.br_blockcount), 0,
5384 isrt ? XFS_QMOPT_RES_RTBLKS :
5385 XFS_QMOPT_RES_REGBLKS);
5386 ip->i_delayed_blks -= del.br_blockcount;
5387 if (cur)
5388 cur->bc_private.b.flags |=
5389 XFS_BTCUR_BPRV_WASDEL;
5390 } else if (cur)
5391 cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
5392 /*
5393 * If it's the case where the directory code is running
5394 * with no block reservation, and the deleted block is in
5395 * the middle of its extent, and the resulting insert
5396 * of an extent would cause transformation to btree format,
5397 * then reject it. The calling code will then swap
5398 * blocks around instead.
5399 * We have to do this now, rather than waiting for the
5400 * conversion to btree format, since the transaction
5401 * will be dirty.
5402 */
5403 if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
5404 XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5405 XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
5406 del.br_startoff > got.br_startoff &&
5407 del.br_startoff + del.br_blockcount <
5408 got.br_startoff + got.br_blockcount) {
5409 error = XFS_ERROR(ENOSPC);
5410 goto error0;
5411 }
5412 error = xfs_bmap_del_extent(ip, tp, lastx, flist, cur, &del,
5413 &tmp_logflags, whichfork, rsvd);
5414 logflags |= tmp_logflags;
5415 if (error)
5416 goto error0;
5417 bno = del.br_startoff - 1;
5418nodelete:
5419 lastx = ifp->if_lastex;
5420 /*
5421 * If not done go on to the next (previous) record.
5422 * Reset ep in case the extents array was re-alloced.
5423 */
5424 ep = &ifp->if_u1.if_extents[lastx];
5425 if (bno != (xfs_fileoff_t)-1 && bno >= start) {
5426 if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
5427 xfs_bmbt_get_startoff(ep) > bno) {
5428 lastx--;
5429 ep--;
5430 }
5431 if (lastx >= 0)
5432 xfs_bmbt_get_all(ep, &got);
5433 extno++;
5434 }
5435 }
5436 ifp->if_lastex = lastx;
5437 *done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
5438 ASSERT(ifp->if_ext_max ==
5439 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5440 /*
5441 * Convert to a btree if necessary.
5442 */
5443 if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
5444 XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
5445 ASSERT(cur == NULL);
5446 error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
5447 &cur, 0, &tmp_logflags, whichfork);
5448 logflags |= tmp_logflags;
5449 if (error)
5450 goto error0;
5451 }
5452 /*
5453 * transform from btree to extents, give it cur
5454 */
5455 else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
5456 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
5457 ASSERT(cur != NULL);
5458 error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
5459 whichfork);
5460 logflags |= tmp_logflags;
5461 if (error)
5462 goto error0;
5463 }
5464 /*
5465 * transform from extents to local?
5466 */
5467 ASSERT(ifp->if_ext_max ==
5468 XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
5469 error = 0;
5470error0:
5471 /*
5472 * Log everything. Do this after conversion, there's no point in
5473 * logging the extent list if we've converted to btree format.
5474 */
5475 if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
5476 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
5477 logflags &= ~XFS_ILOG_FEXT(whichfork);
5478 else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
5479 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
5480 logflags &= ~XFS_ILOG_FBROOT(whichfork);
5481 /*
5482 * Log inode even in the error case, if the transaction
5483 * is dirty we'll need to shut down the filesystem.
5484 */
5485 if (logflags)
5486 xfs_trans_log_inode(tp, ip, logflags);
5487 if (cur) {
5488 if (!error) {
5489 *firstblock = cur->bc_private.b.firstblock;
5490 cur->bc_private.b.allocated = 0;
5491 }
5492 xfs_btree_del_cursor(cur,
5493 error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
5494 }
5495 return error;
5496}
5497
5498/*
5499 * Fcntl interface to xfs_bmapi.
5500 */
5501int /* error code */
5502xfs_getbmap(
5503 bhv_desc_t *bdp, /* XFS behavior descriptor*/
5504 struct getbmap *bmv, /* user bmap structure */
5505 void __user *ap, /* pointer to user's array */
5506 int interface) /* interface flags */
5507{
5508 __int64_t bmvend; /* last block requested */
5509 int error; /* return value */
5510 __int64_t fixlen; /* length for -1 case */
5511 int i; /* extent number */
5512 xfs_inode_t *ip; /* xfs incore inode pointer */
5513 vnode_t *vp; /* corresponding vnode */
5514 int lock; /* lock state */
5515 xfs_bmbt_irec_t *map; /* buffer for user's data */
5516 xfs_mount_t *mp; /* file system mount point */
5517 int nex; /* # of user extents can do */
5518 int nexleft; /* # of user extents left */
5519 int subnex; /* # of bmapi's can do */
5520 int nmap; /* number of map entries */
5521 struct getbmap out; /* output structure */
5522 int whichfork; /* data or attr fork */
5523 int prealloced; /* this is a file with
5524 * preallocated data space */
5525 int sh_unwritten; /* true, if unwritten */
5526 /* extents listed separately */
5527 int bmapi_flags; /* flags for xfs_bmapi */
5528 __int32_t oflags; /* getbmapx bmv_oflags field */
5529
5530 vp = BHV_TO_VNODE(bdp);
5531 ip = XFS_BHVTOI(bdp);
5532 mp = ip->i_mount;
5533
5534 whichfork = interface & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
5535 sh_unwritten = (interface & BMV_IF_PREALLOC) != 0;
5536
5537 /* If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
5538 * generate a DMAPI read event. Otherwise, if the DM_EVENT_READ
5539 * bit is set for the file, generate a read event in order
5540 * that the DMAPI application may do its thing before we return
5541 * the extents. Usually this means restoring user file data to
5542 * regions of the file that look like holes.
5543 *
5544 * The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
5545 * BMV_IF_NO_DMAPI_READ so that read events are generated.
5546 * If this were not true, callers of ioctl( XFS_IOC_GETBMAP )
5547 * could misinterpret holes in a DMAPI file as true holes,
5548 * when in fact they may represent offline user data.
5549 */
5550 if ( (interface & BMV_IF_NO_DMAPI_READ) == 0
5551 && DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)
5552 && whichfork == XFS_DATA_FORK) {
5553
5554 error = XFS_SEND_DATA(mp, DM_EVENT_READ, vp, 0, 0, 0, NULL);
5555 if (error)
5556 return XFS_ERROR(error);
5557 }
5558
5559 if (whichfork == XFS_ATTR_FORK) {
5560 if (XFS_IFORK_Q(ip)) {
5561 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
5562 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
5563 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
5564 return XFS_ERROR(EINVAL);
5565 } else if (unlikely(
5566 ip->i_d.di_aformat != 0 &&
5567 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
5568 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
5569 ip->i_mount);
5570 return XFS_ERROR(EFSCORRUPTED);
5571 }
5572 } else if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
5573 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
5574 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
5575 return XFS_ERROR(EINVAL);
5576 if (whichfork == XFS_DATA_FORK) {
5577 if (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC) {
5578 prealloced = 1;
5579 fixlen = XFS_MAXIOFFSET(mp);
5580 } else {
5581 prealloced = 0;
5582 fixlen = ip->i_d.di_size;
5583 }
5584 } else {
5585 prealloced = 0;
5586 fixlen = 1LL << 32;
5587 }
5588
5589 if (bmv->bmv_length == -1) {
5590 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
5591 bmv->bmv_length = MAX( (__int64_t)(fixlen - bmv->bmv_offset),
5592 (__int64_t)0);
5593 } else if (bmv->bmv_length < 0)
5594 return XFS_ERROR(EINVAL);
5595 if (bmv->bmv_length == 0) {
5596 bmv->bmv_entries = 0;
5597 return 0;
5598 }
5599 nex = bmv->bmv_count - 1;
5600 if (nex <= 0)
5601 return XFS_ERROR(EINVAL);
5602 bmvend = bmv->bmv_offset + bmv->bmv_length;
5603
5604 xfs_ilock(ip, XFS_IOLOCK_SHARED);
5605
5606 if (whichfork == XFS_DATA_FORK && ip->i_delayed_blks) {
5607 /* xfs_fsize_t last_byte = xfs_file_last_byte(ip); */
5608 VOP_FLUSH_PAGES(vp, (xfs_off_t)0, -1, 0, FI_REMAPF, error);
5609 }
5610
5611 ASSERT(whichfork == XFS_ATTR_FORK || ip->i_delayed_blks == 0);
5612
5613 lock = xfs_ilock_map_shared(ip);
5614
5615 /*
5616 * Don't let nex be bigger than the number of extents
5617 * we can have assuming alternating holes and real extents.
5618 */
5619 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
5620 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
5621
5622 bmapi_flags = XFS_BMAPI_AFLAG(whichfork) |
5623 ((sh_unwritten) ? 0 : XFS_BMAPI_IGSTATE);
5624
5625 /*
5626 * Allocate enough space to handle "subnex" maps at a time.
5627 */
5628 subnex = 16;
5629 map = kmem_alloc(subnex * sizeof(*map), KM_SLEEP);
5630
5631 bmv->bmv_entries = 0;
5632
5633 if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0) {
5634 error = 0;
5635 goto unlock_and_return;
5636 }
5637
5638 nexleft = nex;
5639
5640 do {
5641 nmap = (nexleft > subnex) ? subnex : nexleft;
5642 error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
5643 XFS_BB_TO_FSB(mp, bmv->bmv_length),
5644 bmapi_flags, NULL, 0, map, &nmap, NULL);
5645 if (error)
5646 goto unlock_and_return;
5647 ASSERT(nmap <= subnex);
5648
5649 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
5650 nexleft--;
5651 oflags = (map[i].br_state == XFS_EXT_UNWRITTEN) ?
5652 BMV_OF_PREALLOC : 0;
5653 out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
5654 out.bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
5655 ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
5656 if (prealloced &&
5657 map[i].br_startblock == HOLESTARTBLOCK &&
5658 out.bmv_offset + out.bmv_length == bmvend) {
5659 /*
5660 * came to hole at end of file
5661 */
5662 goto unlock_and_return;
5663 } else {
5664 out.bmv_block =
5665 (map[i].br_startblock == HOLESTARTBLOCK) ?
5666 -1 :
5667 XFS_FSB_TO_DB(ip, map[i].br_startblock);
5668
5669 /* return either getbmap/getbmapx structure. */
5670 if (interface & BMV_IF_EXTENDED) {
5671 struct getbmapx outx;
5672
5673 GETBMAP_CONVERT(out,outx);
5674 outx.bmv_oflags = oflags;
5675 outx.bmv_unused1 = outx.bmv_unused2 = 0;
5676 if (copy_to_user(ap, &outx,
5677 sizeof(outx))) {
5678 error = XFS_ERROR(EFAULT);
5679 goto unlock_and_return;
5680 }
5681 } else {
5682 if (copy_to_user(ap, &out,
5683 sizeof(out))) {
5684 error = XFS_ERROR(EFAULT);
5685 goto unlock_and_return;
5686 }
5687 }
5688 bmv->bmv_offset =
5689 out.bmv_offset + out.bmv_length;
5690 bmv->bmv_length = MAX((__int64_t)0,
5691 (__int64_t)(bmvend - bmv->bmv_offset));
5692 bmv->bmv_entries++;
5693 ap = (interface & BMV_IF_EXTENDED) ?
5694 (void __user *)
5695 ((struct getbmapx __user *)ap + 1) :
5696 (void __user *)
5697 ((struct getbmap __user *)ap + 1);
5698 }
5699 }
5700 } while (nmap && nexleft && bmv->bmv_length);
5701
5702unlock_and_return:
5703 xfs_iunlock_map_shared(ip, lock);
5704 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
5705
5706 kmem_free(map, subnex * sizeof(*map));
5707
5708 return error;
5709}
5710
5711/*
5712 * Check the last inode extent to determine whether this allocation will result
5713 * in blocks being allocated at the end of the file. When we allocate new data
5714 * blocks at the end of the file which do not start at the previous data block,
5715 * we will try to align the new blocks at stripe unit boundaries.
5716 */
5717int /* error */
5718xfs_bmap_isaeof(
5719 xfs_inode_t *ip, /* incore inode pointer */
5720 xfs_fileoff_t off, /* file offset in fsblocks */
5721 int whichfork, /* data or attribute fork */
5722 char *aeof) /* return value */
5723{
5724 int error; /* error return value */
5725 xfs_ifork_t *ifp; /* inode fork pointer */
5726 xfs_bmbt_rec_t *lastrec; /* extent list entry pointer */
5727 xfs_extnum_t nextents; /* size of extent list */
5728 xfs_bmbt_irec_t s; /* expanded extent list entry */
5729
5730 ASSERT(whichfork == XFS_DATA_FORK);
5731 ifp = XFS_IFORK_PTR(ip, whichfork);
5732 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5733 (error = xfs_iread_extents(NULL, ip, whichfork)))
5734 return error;
5735 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5736 if (nextents == 0) {
5737 *aeof = 1;
5738 return 0;
5739 }
5740 /*
5741 * Go to the last extent
5742 */
5743 lastrec = &ifp->if_u1.if_extents[nextents - 1];
5744 xfs_bmbt_get_all(lastrec, &s);
5745 /*
5746 * Check we are allocating in the last extent (for delayed allocations)
5747 * or past the last extent for non-delayed allocations.
5748 */
5749 *aeof = (off >= s.br_startoff &&
5750 off < s.br_startoff + s.br_blockcount &&
5751 ISNULLSTARTBLOCK(s.br_startblock)) ||
5752 off >= s.br_startoff + s.br_blockcount;
5753 return 0;
5754}
5755
5756/*
5757 * Check if the endoff is outside the last extent. If so the caller will grow
5758 * the allocation to a stripe unit boundary.
5759 */
5760int /* error */
5761xfs_bmap_eof(
5762 xfs_inode_t *ip, /* incore inode pointer */
5763 xfs_fileoff_t endoff, /* file offset in fsblocks */
5764 int whichfork, /* data or attribute fork */
5765 int *eof) /* result value */
5766{
5767 xfs_fsblock_t blockcount; /* extent block count */
5768 int error; /* error return value */
5769 xfs_ifork_t *ifp; /* inode fork pointer */
5770 xfs_bmbt_rec_t *lastrec; /* extent list entry pointer */
5771 xfs_extnum_t nextents; /* size of extent list */
5772 xfs_fileoff_t startoff; /* extent starting file offset */
5773
5774 ASSERT(whichfork == XFS_DATA_FORK);
5775 ifp = XFS_IFORK_PTR(ip, whichfork);
5776 if (!(ifp->if_flags & XFS_IFEXTENTS) &&
5777 (error = xfs_iread_extents(NULL, ip, whichfork)))
5778 return error;
5779 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5780 if (nextents == 0) {
5781 *eof = 1;
5782 return 0;
5783 }
5784 /*
5785 * Go to the last extent
5786 */
5787 lastrec = &ifp->if_u1.if_extents[nextents - 1];
5788 startoff = xfs_bmbt_get_startoff(lastrec);
5789 blockcount = xfs_bmbt_get_blockcount(lastrec);
5790 *eof = endoff >= startoff + blockcount;
5791 return 0;
5792}
5793
5794#ifdef DEBUG
5795/*
5796 * Check that the extents list for the inode ip is in the right order.
5797 */
5798STATIC void
5799xfs_bmap_check_extents(
5800 xfs_inode_t *ip, /* incore inode pointer */
5801 int whichfork) /* data or attr fork */
5802{
5803 xfs_bmbt_rec_t *base; /* base of extents list */
5804 xfs_bmbt_rec_t *ep; /* current extent entry */
5805 xfs_ifork_t *ifp; /* inode fork pointer */
5806 xfs_extnum_t nextents; /* number of extents in list */
5807
5808 ifp = XFS_IFORK_PTR(ip, whichfork);
5809 ASSERT(ifp->if_flags & XFS_IFEXTENTS);
5810 base = ifp->if_u1.if_extents;
5811 nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
5812 for (ep = base; ep < &base[nextents - 1]; ep++) {
5813 xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
5814 (void *)(ep + 1));
5815 }
5816}
5817
5818STATIC
5819xfs_buf_t *
5820xfs_bmap_get_bp(
5821 xfs_btree_cur_t *cur,
5822 xfs_fsblock_t bno)
5823{
5824 int i;
5825 xfs_buf_t *bp;
5826
5827 if (!cur)
5828 return(NULL);
5829
5830 bp = NULL;
5831 for(i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
5832 bp = cur->bc_bufs[i];
5833 if (!bp) break;
5834 if (XFS_BUF_ADDR(bp) == bno)
5835 break; /* Found it */
5836 }
5837 if (i == XFS_BTREE_MAXLEVELS)
5838 bp = NULL;
5839
5840 if (!bp) { /* Chase down all the log items to see if the bp is there */
5841 xfs_log_item_chunk_t *licp;
5842 xfs_trans_t *tp;
5843
5844 tp = cur->bc_tp;
5845 licp = &tp->t_items;
5846 while (!bp && licp != NULL) {
5847 if (XFS_LIC_ARE_ALL_FREE(licp)) {
5848 licp = licp->lic_next;
5849 continue;
5850 }
5851 for (i = 0; i < licp->lic_unused; i++) {
5852 xfs_log_item_desc_t *lidp;
5853 xfs_log_item_t *lip;
5854 xfs_buf_log_item_t *bip;
5855 xfs_buf_t *lbp;
5856
5857 if (XFS_LIC_ISFREE(licp, i)) {
5858 continue;
5859 }
5860
5861 lidp = XFS_LIC_SLOT(licp, i);
5862 lip = lidp->lid_item;
5863 if (lip->li_type != XFS_LI_BUF)
5864 continue;
5865
5866 bip = (xfs_buf_log_item_t *)lip;
5867 lbp = bip->bli_buf;
5868
5869 if (XFS_BUF_ADDR(lbp) == bno) {
5870 bp = lbp;
5871 break; /* Found it */
5872 }
5873 }
5874 licp = licp->lic_next;
5875 }
5876 }
5877 return(bp);
5878}
5879
5880void
5881xfs_check_block(
5882 xfs_bmbt_block_t *block,
5883 xfs_mount_t *mp,
5884 int root,
5885 short sz)
5886{
5887 int i, j, dmxr;
5888 xfs_bmbt_ptr_t *pp, *thispa; /* pointer to block address */
5889 xfs_bmbt_key_t *prevp, *keyp;
5890
5891 ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
5892
5893 prevp = NULL;
5894 for( i = 1; i <= INT_GET(block->bb_numrecs, ARCH_CONVERT);i++) {
5895 dmxr = mp->m_bmap_dmxr[0];
5896
5897 if (root) {
5898 keyp = XFS_BMAP_BROOT_KEY_ADDR(block, i, sz);
5899 } else {
5900 keyp = XFS_BTREE_KEY_ADDR(mp->m_sb.sb_blocksize,
5901 xfs_bmbt, block, i, dmxr);
5902 }
5903
5904 if (prevp) {
5905 xfs_btree_check_key(XFS_BTNUM_BMAP, prevp, keyp);
5906 }
5907 prevp = keyp;
5908
5909 /*
5910 * Compare the block numbers to see if there are dups.
5911 */
5912
5913 if (root) {
5914 pp = XFS_BMAP_BROOT_PTR_ADDR(block, i, sz);
5915 } else {
5916 pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
5917 xfs_bmbt, block, i, dmxr);
5918 }
5919 for (j = i+1; j <= INT_GET(block->bb_numrecs, ARCH_CONVERT); j++) {
5920 if (root) {
5921 thispa = XFS_BMAP_BROOT_PTR_ADDR(block, j, sz);
5922 } else {
5923 thispa = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
5924 xfs_bmbt, block, j, dmxr);
5925 }
5926 if (INT_GET(*thispa, ARCH_CONVERT) ==
5927 INT_GET(*pp, ARCH_CONVERT)) {
5928 cmn_err(CE_WARN, "%s: thispa(%d) == pp(%d) %Ld",
5929 __FUNCTION__, j, i,
5930 INT_GET(*thispa, ARCH_CONVERT));
5931 panic("%s: ptrs are equal in node\n",
5932 __FUNCTION__);
5933 }
5934 }
5935 }
5936}
5937
5938/*
5939 * Check that the extents for the inode ip are in the right order in all
5940 * btree leaves.
5941 */
5942
5943STATIC void
5944xfs_bmap_check_leaf_extents(
5945 xfs_btree_cur_t *cur, /* btree cursor or null */
5946 xfs_inode_t *ip, /* incore inode pointer */
5947 int whichfork) /* data or attr fork */
5948{
5949 xfs_bmbt_block_t *block; /* current btree block */
5950 xfs_fsblock_t bno; /* block # of "block" */
5951 xfs_buf_t *bp; /* buffer for "block" */
5952 int error; /* error return value */
5953 xfs_extnum_t i=0; /* index into the extents list */
5954 xfs_ifork_t *ifp; /* fork structure */
5955 int level; /* btree level, for checking */
5956 xfs_mount_t *mp; /* file system mount structure */
5957 xfs_bmbt_ptr_t *pp; /* pointer to block address */
5958 xfs_bmbt_rec_t *ep, *lastp; /* extent pointers in block entry */
5959 int bp_release = 0;
5960
5961 if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
5962 return;
5963 }
5964
5965 bno = NULLFSBLOCK;
5966 mp = ip->i_mount;
5967 ifp = XFS_IFORK_PTR(ip, whichfork);
5968 block = ifp->if_broot;
5969 /*
5970 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
5971 */
5972 ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
5973 level = INT_GET(block->bb_level, ARCH_CONVERT);
5974 xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
5975 pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
5976 ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
5977 ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
5978 ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
5979 bno = INT_GET(*pp, ARCH_CONVERT);
5980 /*
5981 * Go down the tree until leaf level is reached, following the first
5982 * pointer (leftmost) at each level.
5983 */
5984 while (level-- > 0) {
5985 /* See if buf is in cur first */
5986 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
5987 if (bp) {
5988 bp_release = 0;
5989 } else {
5990 bp_release = 1;
5991 }
5992 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
5993 XFS_BMAP_BTREE_REF)))
5994 goto error_norelse;
5995 block = XFS_BUF_TO_BMBT_BLOCK(bp);
5996 XFS_WANT_CORRUPTED_GOTO(
5997 XFS_BMAP_SANITY_CHECK(mp, block, level),
5998 error0);
5999 if (level == 0)
6000 break;
6001
6002 /*
6003 * Check this block for basic sanity (increasing keys and
6004 * no duplicate blocks).
6005 */
6006
6007 xfs_check_block(block, mp, 0, 0);
6008 pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
6009 1, mp->m_bmap_dmxr[1]);
6010 XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)), error0);
6011 bno = INT_GET(*pp, ARCH_CONVERT);
6012 if (bp_release) {
6013 bp_release = 0;
6014 xfs_trans_brelse(NULL, bp);
6015 }
6016 }
6017
6018 /*
6019 * Here with bp and block set to the leftmost leaf node in the tree.
6020 */
6021 i = 0;
6022
6023 /*
6024 * Loop over all leaf nodes checking that all extents are in the right order.
6025 */
6026 lastp = NULL;
6027 for (;;) {
6028 xfs_bmbt_rec_t *frp;
6029 xfs_fsblock_t nextbno;
6030 xfs_extnum_t num_recs;
6031
6032
6033 num_recs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
6034
6035 /*
6036 * Read-ahead the next leaf block, if any.
6037 */
6038
6039 nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
6040
6041 /*
6042 * Check all the extents to make sure they are OK.
6043 * If we had a previous block, the last entry should
6044 * conform with the first entry in this one.
6045 */
6046
6047 frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
6048 block, 1, mp->m_bmap_dmxr[0]);
6049
6050 for (ep = frp;ep < frp + (num_recs - 1); ep++) {
6051 if (lastp) {
6052 xfs_btree_check_rec(XFS_BTNUM_BMAP,
6053 (void *)lastp, (void *)ep);
6054 }
6055 xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
6056 (void *)(ep + 1));
6057 }
6058 lastp = frp + num_recs - 1; /* For the next iteration */
6059
6060 i += num_recs;
6061 if (bp_release) {
6062 bp_release = 0;
6063 xfs_trans_brelse(NULL, bp);
6064 }
6065 bno = nextbno;
6066 /*
6067 * If we've reached the end, stop.
6068 */
6069 if (bno == NULLFSBLOCK)
6070 break;
6071
6072 bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
6073 if (bp) {
6074 bp_release = 0;
6075 } else {
6076 bp_release = 1;
6077 }
6078 if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
6079 XFS_BMAP_BTREE_REF)))
6080 goto error_norelse;
6081 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6082 }
6083 if (bp_release) {
6084 bp_release = 0;
6085 xfs_trans_brelse(NULL, bp);
6086 }
6087 return;
6088
6089error0:
6090 cmn_err(CE_WARN, "%s: at error0", __FUNCTION__);
6091 if (bp_release)
6092 xfs_trans_brelse(NULL, bp);
6093error_norelse:
6094 cmn_err(CE_WARN, "%s: BAD after btree leaves for %d extents",
6095 i, __FUNCTION__);
6096 panic("%s: CORRUPTED BTREE OR SOMETHING", __FUNCTION__);
6097 return;
6098}
6099#endif
6100
6101/*
6102 * Count fsblocks of the given fork.
6103 */
6104int /* error */
6105xfs_bmap_count_blocks(
6106 xfs_trans_t *tp, /* transaction pointer */
6107 xfs_inode_t *ip, /* incore inode */
6108 int whichfork, /* data or attr fork */
6109 int *count) /* out: count of blocks */
6110{
6111 xfs_bmbt_block_t *block; /* current btree block */
6112 xfs_fsblock_t bno; /* block # of "block" */
6113 xfs_ifork_t *ifp; /* fork structure */
6114 int level; /* btree level, for checking */
6115 xfs_mount_t *mp; /* file system mount structure */
6116 xfs_bmbt_ptr_t *pp; /* pointer to block address */
6117
6118 bno = NULLFSBLOCK;
6119 mp = ip->i_mount;
6120 ifp = XFS_IFORK_PTR(ip, whichfork);
6121 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
6122 if (unlikely(xfs_bmap_count_leaves(ifp->if_u1.if_extents,
6123 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
6124 count) < 0)) {
6125 XFS_ERROR_REPORT("xfs_bmap_count_blocks(1)",
6126 XFS_ERRLEVEL_LOW, mp);
6127 return XFS_ERROR(EFSCORRUPTED);
6128 }
6129 return 0;
6130 }
6131
6132 /*
6133 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
6134 */
6135 block = ifp->if_broot;
6136 ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
6137 level = INT_GET(block->bb_level, ARCH_CONVERT);
6138 pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
6139 ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
6140 ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
6141 ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
6142 bno = INT_GET(*pp, ARCH_CONVERT);
6143
6144 if (unlikely(xfs_bmap_count_tree(mp, tp, bno, level, count) < 0)) {
6145 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
6146 mp);
6147 return XFS_ERROR(EFSCORRUPTED);
6148 }
6149
6150 return 0;
6151}
6152
6153/*
6154 * Recursively walks each level of a btree
6155 * to count total fsblocks is use.
6156 */
6157int /* error */
6158xfs_bmap_count_tree(
6159 xfs_mount_t *mp, /* file system mount point */
6160 xfs_trans_t *tp, /* transaction pointer */
6161 xfs_fsblock_t blockno, /* file system block number */
6162 int levelin, /* level in btree */
6163 int *count) /* Count of blocks */
6164{
6165 int error;
6166 xfs_buf_t *bp, *nbp;
6167 int level = levelin;
6168 xfs_bmbt_ptr_t *pp;
6169 xfs_fsblock_t bno = blockno;
6170 xfs_fsblock_t nextbno;
6171 xfs_bmbt_block_t *block, *nextblock;
6172 int numrecs;
6173 xfs_bmbt_rec_t *frp;
6174
6175 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
6176 return error;
6177 *count += 1;
6178 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6179
6180 if (--level) {
6181 /* Not at node above leafs, count this level of nodes */
6182 nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
6183 while (nextbno != NULLFSBLOCK) {
6184 if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
6185 0, &nbp, XFS_BMAP_BTREE_REF)))
6186 return error;
6187 *count += 1;
6188 nextblock = XFS_BUF_TO_BMBT_BLOCK(nbp);
6189 nextbno = INT_GET(nextblock->bb_rightsib, ARCH_CONVERT);
6190 xfs_trans_brelse(tp, nbp);
6191 }
6192
6193 /* Dive to the next level */
6194 pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
6195 xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
6196 bno = INT_GET(*pp, ARCH_CONVERT);
6197 if (unlikely((error =
6198 xfs_bmap_count_tree(mp, tp, bno, level, count)) < 0)) {
6199 xfs_trans_brelse(tp, bp);
6200 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
6201 XFS_ERRLEVEL_LOW, mp);
6202 return XFS_ERROR(EFSCORRUPTED);
6203 }
6204 xfs_trans_brelse(tp, bp);
6205 } else {
6206 /* count all level 1 nodes and their leaves */
6207 for (;;) {
6208 nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
6209 numrecs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
6210 frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize,
6211 xfs_bmbt, block, 1, mp->m_bmap_dmxr[0]);
6212 if (unlikely(xfs_bmap_count_leaves(frp, numrecs, count) < 0)) {
6213 xfs_trans_brelse(tp, bp);
6214 XFS_ERROR_REPORT("xfs_bmap_count_tree(2)",
6215 XFS_ERRLEVEL_LOW, mp);
6216 return XFS_ERROR(EFSCORRUPTED);
6217 }
6218 xfs_trans_brelse(tp, bp);
6219 if (nextbno == NULLFSBLOCK)
6220 break;
6221 bno = nextbno;
6222 if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
6223 XFS_BMAP_BTREE_REF)))
6224 return error;
6225 *count += 1;
6226 block = XFS_BUF_TO_BMBT_BLOCK(bp);
6227 }
6228 }
6229 return 0;
6230}
6231
6232/*
6233 * Count leaf blocks given a pointer to an extent list.
6234 */
6235int
6236xfs_bmap_count_leaves(
6237 xfs_bmbt_rec_t *frp,
6238 int numrecs,
6239 int *count)
6240{
6241 int b;
6242
6243 for ( b = 1; b <= numrecs; b++, frp++)
6244 *count += xfs_bmbt_disk_get_blockcount(frp);
6245 return 0;
6246}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-16 07:21:25 -0500