aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_dir_leaf.c
diff options
context:
space:
mode:
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_dir_leaf.c
Linux-2.6.12-rc2v2.6.12-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_dir_leaf.c')
-rw-r--r--fs/xfs/xfs_dir_leaf.c2231
1 files changed, 2231 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir_leaf.c b/fs/xfs/xfs_dir_leaf.c
new file mode 100644
index 000000000000..617018d6bbdc
--- /dev/null
+++ b/fs/xfs/xfs_dir_leaf.c
@@ -0,0 +1,2231 @@
1/*
2 * Copyright (c) 2000-2003 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/*
34 * xfs_dir_leaf.c
35 *
36 * GROT: figure out how to recover gracefully when bmap returns ENOSPC.
37 */
38
39#include "xfs.h"
40
41#include "xfs_macros.h"
42#include "xfs_types.h"
43#include "xfs_inum.h"
44#include "xfs_log.h"
45#include "xfs_trans.h"
46#include "xfs_sb.h"
47#include "xfs_dir.h"
48#include "xfs_dir2.h"
49#include "xfs_dmapi.h"
50#include "xfs_mount.h"
51#include "xfs_alloc_btree.h"
52#include "xfs_bmap_btree.h"
53#include "xfs_ialloc_btree.h"
54#include "xfs_alloc.h"
55#include "xfs_btree.h"
56#include "xfs_attr_sf.h"
57#include "xfs_dir_sf.h"
58#include "xfs_dir2_sf.h"
59#include "xfs_dinode.h"
60#include "xfs_inode_item.h"
61#include "xfs_inode.h"
62#include "xfs_bmap.h"
63#include "xfs_da_btree.h"
64#include "xfs_dir_leaf.h"
65#include "xfs_error.h"
66
67/*
68 * xfs_dir_leaf.c
69 *
70 * Routines to implement leaf blocks of directories as Btrees of hashed names.
71 */
72
73/*========================================================================
74 * Function prototypes for the kernel.
75 *========================================================================*/
76
77/*
78 * Routines used for growing the Btree.
79 */
80STATIC void xfs_dir_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args,
81 int insertion_index,
82 int freemap_index);
83STATIC int xfs_dir_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer,
84 int musthave, int justcheck);
85STATIC void xfs_dir_leaf_rebalance(xfs_da_state_t *state,
86 xfs_da_state_blk_t *blk1,
87 xfs_da_state_blk_t *blk2);
88STATIC int xfs_dir_leaf_figure_balance(xfs_da_state_t *state,
89 xfs_da_state_blk_t *leaf_blk_1,
90 xfs_da_state_blk_t *leaf_blk_2,
91 int *number_entries_in_blk1,
92 int *number_namebytes_in_blk1);
93
94/*
95 * Utility routines.
96 */
97STATIC void xfs_dir_leaf_moveents(xfs_dir_leafblock_t *src_leaf,
98 int src_start,
99 xfs_dir_leafblock_t *dst_leaf,
100 int dst_start, int move_count,
101 xfs_mount_t *mp);
102
103
104/*========================================================================
105 * External routines when dirsize < XFS_IFORK_DSIZE(dp).
106 *========================================================================*/
107
108
109/*
110 * Validate a given inode number.
111 */
112int
113xfs_dir_ino_validate(xfs_mount_t *mp, xfs_ino_t ino)
114{
115 xfs_agblock_t agblkno;
116 xfs_agino_t agino;
117 xfs_agnumber_t agno;
118 int ino_ok;
119 int ioff;
120
121 agno = XFS_INO_TO_AGNO(mp, ino);
122 agblkno = XFS_INO_TO_AGBNO(mp, ino);
123 ioff = XFS_INO_TO_OFFSET(mp, ino);
124 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
125 ino_ok =
126 agno < mp->m_sb.sb_agcount &&
127 agblkno < mp->m_sb.sb_agblocks &&
128 agblkno != 0 &&
129 ioff < (1 << mp->m_sb.sb_inopblog) &&
130 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
131 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
132 XFS_RANDOM_DIR_INO_VALIDATE))) {
133 xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
134 (unsigned long long) ino);
135 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
136 return XFS_ERROR(EFSCORRUPTED);
137 }
138 return 0;
139}
140
141/*
142 * Create the initial contents of a shortform directory.
143 */
144int
145xfs_dir_shortform_create(xfs_da_args_t *args, xfs_ino_t parent)
146{
147 xfs_dir_sf_hdr_t *hdr;
148 xfs_inode_t *dp;
149
150 dp = args->dp;
151 ASSERT(dp != NULL);
152 ASSERT(dp->i_d.di_size == 0);
153 if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
154 dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
155 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
156 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
157 dp->i_df.if_flags |= XFS_IFINLINE;
158 }
159 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
160 ASSERT(dp->i_df.if_bytes == 0);
161 xfs_idata_realloc(dp, sizeof(*hdr), XFS_DATA_FORK);
162 hdr = (xfs_dir_sf_hdr_t *)dp->i_df.if_u1.if_data;
163 XFS_DIR_SF_PUT_DIRINO(&parent, &hdr->parent);
164
165 hdr->count = 0;
166 dp->i_d.di_size = sizeof(*hdr);
167 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
168 return(0);
169}
170
171/*
172 * Add a name to the shortform directory structure.
173 * Overflow from the inode has already been checked for.
174 */
175int
176xfs_dir_shortform_addname(xfs_da_args_t *args)
177{
178 xfs_dir_shortform_t *sf;
179 xfs_dir_sf_entry_t *sfe;
180 int i, offset, size;
181 xfs_inode_t *dp;
182
183 dp = args->dp;
184 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
185 /*
186 * Catch the case where the conversion from shortform to leaf
187 * failed part way through.
188 */
189 if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
190 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
191 return XFS_ERROR(EIO);
192 }
193 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
194 ASSERT(dp->i_df.if_u1.if_data != NULL);
195 sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
196 sfe = &sf->list[0];
197 for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
198 if (sfe->namelen == args->namelen &&
199 args->name[0] == sfe->name[0] &&
200 memcmp(args->name, sfe->name, args->namelen) == 0)
201 return(XFS_ERROR(EEXIST));
202 sfe = XFS_DIR_SF_NEXTENTRY(sfe);
203 }
204
205 offset = (int)((char *)sfe - (char *)sf);
206 size = XFS_DIR_SF_ENTSIZE_BYNAME(args->namelen);
207 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
208 sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
209 sfe = (xfs_dir_sf_entry_t *)((char *)sf + offset);
210
211 XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sfe->inumber);
212 sfe->namelen = args->namelen;
213 memcpy(sfe->name, args->name, sfe->namelen);
214 INT_MOD(sf->hdr.count, ARCH_CONVERT, +1);
215
216 dp->i_d.di_size += size;
217 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
218
219 return(0);
220}
221
222/*
223 * Remove a name from the shortform directory structure.
224 */
225int
226xfs_dir_shortform_removename(xfs_da_args_t *args)
227{
228 xfs_dir_shortform_t *sf;
229 xfs_dir_sf_entry_t *sfe;
230 int base, size = 0, i;
231 xfs_inode_t *dp;
232
233 dp = args->dp;
234 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
235 /*
236 * Catch the case where the conversion from shortform to leaf
237 * failed part way through.
238 */
239 if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
240 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
241 return XFS_ERROR(EIO);
242 }
243 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
244 ASSERT(dp->i_df.if_u1.if_data != NULL);
245 base = sizeof(xfs_dir_sf_hdr_t);
246 sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
247 sfe = &sf->list[0];
248 for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
249 size = XFS_DIR_SF_ENTSIZE_BYENTRY(sfe);
250 if (sfe->namelen == args->namelen &&
251 sfe->name[0] == args->name[0] &&
252 memcmp(sfe->name, args->name, args->namelen) == 0)
253 break;
254 base += size;
255 sfe = XFS_DIR_SF_NEXTENTRY(sfe);
256 }
257 if (i < 0) {
258 ASSERT(args->oknoent);
259 return(XFS_ERROR(ENOENT));
260 }
261
262 if ((base + size) != dp->i_d.di_size) {
263 memmove(&((char *)sf)[base], &((char *)sf)[base+size],
264 dp->i_d.di_size - (base+size));
265 }
266 INT_MOD(sf->hdr.count, ARCH_CONVERT, -1);
267
268 xfs_idata_realloc(dp, -size, XFS_DATA_FORK);
269 dp->i_d.di_size -= size;
270 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
271
272 return(0);
273}
274
275/*
276 * Look up a name in a shortform directory structure.
277 */
278int
279xfs_dir_shortform_lookup(xfs_da_args_t *args)
280{
281 xfs_dir_shortform_t *sf;
282 xfs_dir_sf_entry_t *sfe;
283 int i;
284 xfs_inode_t *dp;
285
286 dp = args->dp;
287 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
288 /*
289 * Catch the case where the conversion from shortform to leaf
290 * failed part way through.
291 */
292 if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
293 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
294 return XFS_ERROR(EIO);
295 }
296 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
297 ASSERT(dp->i_df.if_u1.if_data != NULL);
298 sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
299 if (args->namelen == 2 &&
300 args->name[0] == '.' && args->name[1] == '.') {
301 XFS_DIR_SF_GET_DIRINO(&sf->hdr.parent, &args->inumber);
302 return(XFS_ERROR(EEXIST));
303 }
304 if (args->namelen == 1 && args->name[0] == '.') {
305 args->inumber = dp->i_ino;
306 return(XFS_ERROR(EEXIST));
307 }
308 sfe = &sf->list[0];
309 for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
310 if (sfe->namelen == args->namelen &&
311 sfe->name[0] == args->name[0] &&
312 memcmp(args->name, sfe->name, args->namelen) == 0) {
313 XFS_DIR_SF_GET_DIRINO(&sfe->inumber, &args->inumber);
314 return(XFS_ERROR(EEXIST));
315 }
316 sfe = XFS_DIR_SF_NEXTENTRY(sfe);
317 }
318 ASSERT(args->oknoent);
319 return(XFS_ERROR(ENOENT));
320}
321
322/*
323 * Convert from using the shortform to the leaf.
324 */
325int
326xfs_dir_shortform_to_leaf(xfs_da_args_t *iargs)
327{
328 xfs_inode_t *dp;
329 xfs_dir_shortform_t *sf;
330 xfs_dir_sf_entry_t *sfe;
331 xfs_da_args_t args;
332 xfs_ino_t inumber;
333 char *tmpbuffer;
334 int retval, i, size;
335 xfs_dablk_t blkno;
336 xfs_dabuf_t *bp;
337
338 dp = iargs->dp;
339 /*
340 * Catch the case where the conversion from shortform to leaf
341 * failed part way through.
342 */
343 if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
344 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
345 return XFS_ERROR(EIO);
346 }
347 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
348 ASSERT(dp->i_df.if_u1.if_data != NULL);
349 size = dp->i_df.if_bytes;
350 tmpbuffer = kmem_alloc(size, KM_SLEEP);
351 ASSERT(tmpbuffer != NULL);
352
353 memcpy(tmpbuffer, dp->i_df.if_u1.if_data, size);
354
355 sf = (xfs_dir_shortform_t *)tmpbuffer;
356 XFS_DIR_SF_GET_DIRINO(&sf->hdr.parent, &inumber);
357
358 xfs_idata_realloc(dp, -size, XFS_DATA_FORK);
359 dp->i_d.di_size = 0;
360 xfs_trans_log_inode(iargs->trans, dp, XFS_ILOG_CORE);
361 retval = xfs_da_grow_inode(iargs, &blkno);
362 if (retval)
363 goto out;
364
365 ASSERT(blkno == 0);
366 retval = xfs_dir_leaf_create(iargs, blkno, &bp);
367 if (retval)
368 goto out;
369 xfs_da_buf_done(bp);
370
371 args.name = ".";
372 args.namelen = 1;
373 args.hashval = xfs_dir_hash_dot;
374 args.inumber = dp->i_ino;
375 args.dp = dp;
376 args.firstblock = iargs->firstblock;
377 args.flist = iargs->flist;
378 args.total = iargs->total;
379 args.whichfork = XFS_DATA_FORK;
380 args.trans = iargs->trans;
381 args.justcheck = 0;
382 args.addname = args.oknoent = 1;
383 retval = xfs_dir_leaf_addname(&args);
384 if (retval)
385 goto out;
386
387 args.name = "..";
388 args.namelen = 2;
389 args.hashval = xfs_dir_hash_dotdot;
390 args.inumber = inumber;
391 retval = xfs_dir_leaf_addname(&args);
392 if (retval)
393 goto out;
394
395 sfe = &sf->list[0];
396 for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
397 args.name = (char *)(sfe->name);
398 args.namelen = sfe->namelen;
399 args.hashval = xfs_da_hashname((char *)(sfe->name),
400 sfe->namelen);
401 XFS_DIR_SF_GET_DIRINO(&sfe->inumber, &args.inumber);
402 retval = xfs_dir_leaf_addname(&args);
403 if (retval)
404 goto out;
405 sfe = XFS_DIR_SF_NEXTENTRY(sfe);
406 }
407 retval = 0;
408
409out:
410 kmem_free(tmpbuffer, size);
411 return(retval);
412}
413
414STATIC int
415xfs_dir_shortform_compare(const void *a, const void *b)
416{
417 xfs_dir_sf_sort_t *sa, *sb;
418
419 sa = (xfs_dir_sf_sort_t *)a;
420 sb = (xfs_dir_sf_sort_t *)b;
421 if (sa->hash < sb->hash)
422 return -1;
423 else if (sa->hash > sb->hash)
424 return 1;
425 else
426 return sa->entno - sb->entno;
427}
428
429/*
430 * Copy out directory entries for getdents(), for shortform directories.
431 */
432/*ARGSUSED*/
433int
434xfs_dir_shortform_getdents(xfs_inode_t *dp, uio_t *uio, int *eofp,
435 xfs_dirent_t *dbp, xfs_dir_put_t put)
436{
437 xfs_dir_shortform_t *sf;
438 xfs_dir_sf_entry_t *sfe;
439 int retval, i, sbsize, nsbuf, lastresid=0, want_entno;
440 xfs_mount_t *mp;
441 xfs_dahash_t cookhash, hash;
442 xfs_dir_put_args_t p;
443 xfs_dir_sf_sort_t *sbuf, *sbp;
444
445 mp = dp->i_mount;
446 sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
447 cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
448 want_entno = XFS_DA_COOKIE_ENTRY(mp, uio->uio_offset);
449 nsbuf = INT_GET(sf->hdr.count, ARCH_CONVERT) + 2;
450 sbsize = (nsbuf + 1) * sizeof(*sbuf);
451 sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP);
452
453 xfs_dir_trace_g_du("sf: start", dp, uio);
454
455 /*
456 * Collect all the entries into the buffer.
457 * Entry 0 is .
458 */
459 sbp->entno = 0;
460 sbp->seqno = 0;
461 sbp->hash = xfs_dir_hash_dot;
462 sbp->ino = dp->i_ino;
463 sbp->name = ".";
464 sbp->namelen = 1;
465 sbp++;
466
467 /*
468 * Entry 1 is ..
469 */
470 sbp->entno = 1;
471 sbp->seqno = 0;
472 sbp->hash = xfs_dir_hash_dotdot;
473 sbp->ino = XFS_GET_DIR_INO8(sf->hdr.parent);
474 sbp->name = "..";
475 sbp->namelen = 2;
476 sbp++;
477
478 /*
479 * Scan the directory data for the rest of the entries.
480 */
481 for (i = 0, sfe = &sf->list[0];
482 i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
483
484 if (unlikely(
485 ((char *)sfe < (char *)sf) ||
486 ((char *)sfe >= ((char *)sf + dp->i_df.if_bytes)))) {
487 xfs_dir_trace_g_du("sf: corrupted", dp, uio);
488 XFS_CORRUPTION_ERROR("xfs_dir_shortform_getdents",
489 XFS_ERRLEVEL_LOW, mp, sfe);
490 kmem_free(sbuf, sbsize);
491 return XFS_ERROR(EFSCORRUPTED);
492 }
493
494 sbp->entno = i + 2;
495 sbp->seqno = 0;
496 sbp->hash = xfs_da_hashname((char *)sfe->name, sfe->namelen);
497 sbp->ino = XFS_GET_DIR_INO8(sfe->inumber);
498 sbp->name = (char *)sfe->name;
499 sbp->namelen = sfe->namelen;
500 sfe = XFS_DIR_SF_NEXTENTRY(sfe);
501 sbp++;
502 }
503
504 /*
505 * Sort the entries on hash then entno.
506 */
507 qsort(sbuf, nsbuf, sizeof(*sbuf), xfs_dir_shortform_compare);
508 /*
509 * Stuff in last entry.
510 */
511 sbp->entno = nsbuf;
512 sbp->hash = XFS_DA_MAXHASH;
513 sbp->seqno = 0;
514 /*
515 * Figure out the sequence numbers in case there's a hash duplicate.
516 */
517 for (hash = sbuf->hash, sbp = sbuf + 1;
518 sbp < &sbuf[nsbuf + 1]; sbp++) {
519 if (sbp->hash == hash)
520 sbp->seqno = sbp[-1].seqno + 1;
521 else
522 hash = sbp->hash;
523 }
524
525 /*
526 * Set up put routine.
527 */
528 p.dbp = dbp;
529 p.put = put;
530 p.uio = uio;
531
532 /*
533 * Find our place.
534 */
535 for (sbp = sbuf; sbp < &sbuf[nsbuf + 1]; sbp++) {
536 if (sbp->hash > cookhash ||
537 (sbp->hash == cookhash && sbp->seqno >= want_entno))
538 break;
539 }
540
541 /*
542 * Did we fail to find anything? We stop at the last entry,
543 * the one we put maxhash into.
544 */
545 if (sbp == &sbuf[nsbuf]) {
546 kmem_free(sbuf, sbsize);
547 xfs_dir_trace_g_du("sf: hash beyond end", dp, uio);
548 uio->uio_offset = XFS_DA_MAKE_COOKIE(mp, 0, 0, XFS_DA_MAXHASH);
549 *eofp = 1;
550 return 0;
551 }
552
553 /*
554 * Loop putting entries into the user buffer.
555 */
556 while (sbp < &sbuf[nsbuf]) {
557 /*
558 * Save the first resid in a run of equal-hashval entries
559 * so that we can back them out if they don't all fit.
560 */
561 if (sbp->seqno == 0 || sbp == sbuf)
562 lastresid = uio->uio_resid;
563 XFS_PUT_COOKIE(p.cook, mp, 0, sbp[1].seqno, sbp[1].hash);
564 p.ino = sbp->ino;
565#if XFS_BIG_INUMS
566 p.ino += mp->m_inoadd;
567#endif
568 p.name = sbp->name;
569 p.namelen = sbp->namelen;
570 retval = p.put(&p);
571 if (!p.done) {
572 uio->uio_offset =
573 XFS_DA_MAKE_COOKIE(mp, 0, 0, sbp->hash);
574 kmem_free(sbuf, sbsize);
575 uio->uio_resid = lastresid;
576 xfs_dir_trace_g_du("sf: E-O-B", dp, uio);
577 return retval;
578 }
579 sbp++;
580 }
581 kmem_free(sbuf, sbsize);
582 uio->uio_offset = p.cook.o;
583 *eofp = 1;
584 xfs_dir_trace_g_du("sf: E-O-F", dp, uio);
585 return 0;
586}
587
588/*
589 * Look up a name in a shortform directory structure, replace the inode number.
590 */
591int
592xfs_dir_shortform_replace(xfs_da_args_t *args)
593{
594 xfs_dir_shortform_t *sf;
595 xfs_dir_sf_entry_t *sfe;
596 xfs_inode_t *dp;
597 int i;
598
599 dp = args->dp;
600 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
601 /*
602 * Catch the case where the conversion from shortform to leaf
603 * failed part way through.
604 */
605 if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
606 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
607 return XFS_ERROR(EIO);
608 }
609 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
610 ASSERT(dp->i_df.if_u1.if_data != NULL);
611 sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
612 if (args->namelen == 2 &&
613 args->name[0] == '.' && args->name[1] == '.') {
614 /* XXX - replace assert? */
615 XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sf->hdr.parent);
616 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
617 return(0);
618 }
619 ASSERT(args->namelen != 1 || args->name[0] != '.');
620 sfe = &sf->list[0];
621 for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
622 if (sfe->namelen == args->namelen &&
623 sfe->name[0] == args->name[0] &&
624 memcmp(args->name, sfe->name, args->namelen) == 0) {
625 ASSERT(memcmp((char *)&args->inumber,
626 (char *)&sfe->inumber, sizeof(xfs_ino_t)));
627 XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sfe->inumber);
628 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
629 return(0);
630 }
631 sfe = XFS_DIR_SF_NEXTENTRY(sfe);
632 }
633 ASSERT(args->oknoent);
634 return(XFS_ERROR(ENOENT));
635}
636
637/*
638 * Convert a leaf directory to shortform structure
639 */
640int
641xfs_dir_leaf_to_shortform(xfs_da_args_t *iargs)
642{
643 xfs_dir_leafblock_t *leaf;
644 xfs_dir_leaf_hdr_t *hdr;
645 xfs_dir_leaf_entry_t *entry;
646 xfs_dir_leaf_name_t *namest;
647 xfs_da_args_t args;
648 xfs_inode_t *dp;
649 xfs_ino_t parent;
650 char *tmpbuffer;
651 int retval, i;
652 xfs_dabuf_t *bp;
653
654 dp = iargs->dp;
655 tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP);
656 ASSERT(tmpbuffer != NULL);
657
658 retval = xfs_da_read_buf(iargs->trans, iargs->dp, 0, -1, &bp,
659 XFS_DATA_FORK);
660 if (retval)
661 goto out;
662 ASSERT(bp != NULL);
663 memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount));
664 leaf = (xfs_dir_leafblock_t *)tmpbuffer;
665 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
666 memset(bp->data, 0, XFS_LBSIZE(dp->i_mount));
667
668 /*
669 * Find and special case the parent inode number
670 */
671 hdr = &leaf->hdr;
672 entry = &leaf->entries[0];
673 for (i = INT_GET(hdr->count, ARCH_CONVERT)-1; i >= 0; entry++, i--) {
674 namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
675 if ((entry->namelen == 2) &&
676 (namest->name[0] == '.') &&
677 (namest->name[1] == '.')) {
678 XFS_DIR_SF_GET_DIRINO(&namest->inumber, &parent);
679 entry->nameidx = 0;
680 } else if ((entry->namelen == 1) && (namest->name[0] == '.')) {
681 entry->nameidx = 0;
682 }
683 }
684 retval = xfs_da_shrink_inode(iargs, 0, bp);
685 if (retval)
686 goto out;
687 retval = xfs_dir_shortform_create(iargs, parent);
688 if (retval)
689 goto out;
690
691 /*
692 * Copy the rest of the filenames
693 */
694 entry = &leaf->entries[0];
695 args.dp = dp;
696 args.firstblock = iargs->firstblock;
697 args.flist = iargs->flist;
698 args.total = iargs->total;
699 args.whichfork = XFS_DATA_FORK;
700 args.trans = iargs->trans;
701 args.justcheck = 0;
702 args.addname = args.oknoent = 1;
703 for (i = 0; i < INT_GET(hdr->count, ARCH_CONVERT); entry++, i++) {
704 if (!entry->nameidx)
705 continue;
706 namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
707 args.name = (char *)(namest->name);
708 args.namelen = entry->namelen;
709 args.hashval = INT_GET(entry->hashval, ARCH_CONVERT);
710 XFS_DIR_SF_GET_DIRINO(&namest->inumber, &args.inumber);
711 xfs_dir_shortform_addname(&args);
712 }
713
714out:
715 kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount));
716 return(retval);
717}
718
719/*
720 * Convert from using a single leaf to a root node and a leaf.
721 */
722int
723xfs_dir_leaf_to_node(xfs_da_args_t *args)
724{
725 xfs_dir_leafblock_t *leaf;
726 xfs_da_intnode_t *node;
727 xfs_inode_t *dp;
728 xfs_dabuf_t *bp1, *bp2;
729 xfs_dablk_t blkno;
730 int retval;
731
732 dp = args->dp;
733 retval = xfs_da_grow_inode(args, &blkno);
734 ASSERT(blkno == 1);
735 if (retval)
736 return(retval);
737 retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1,
738 XFS_DATA_FORK);
739 if (retval)
740 return(retval);
741 ASSERT(bp1 != NULL);
742 retval = xfs_da_get_buf(args->trans, args->dp, 1, -1, &bp2,
743 XFS_DATA_FORK);
744 if (retval) {
745 xfs_da_buf_done(bp1);
746 return(retval);
747 }
748 ASSERT(bp2 != NULL);
749 memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount));
750 xfs_da_buf_done(bp1);
751 xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1);
752
753 /*
754 * Set up the new root node.
755 */
756 retval = xfs_da_node_create(args, 0, 1, &bp1, XFS_DATA_FORK);
757 if (retval) {
758 xfs_da_buf_done(bp2);
759 return(retval);
760 }
761 node = bp1->data;
762 leaf = bp2->data;
763 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
764 INT_SET(node->btree[0].hashval, ARCH_CONVERT, INT_GET(leaf->entries[ INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT));
765 xfs_da_buf_done(bp2);
766 INT_SET(node->btree[0].before, ARCH_CONVERT, blkno);
767 INT_SET(node->hdr.count, ARCH_CONVERT, 1);
768 xfs_da_log_buf(args->trans, bp1,
769 XFS_DA_LOGRANGE(node, &node->btree[0], sizeof(node->btree[0])));
770 xfs_da_buf_done(bp1);
771
772 return(retval);
773}
774
775
776/*========================================================================
777 * Routines used for growing the Btree.
778 *========================================================================*/
779
780/*
781 * Create the initial contents of a leaf directory
782 * or a leaf in a node directory.
783 */
784int
785xfs_dir_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp)
786{
787 xfs_dir_leafblock_t *leaf;
788 xfs_dir_leaf_hdr_t *hdr;
789 xfs_inode_t *dp;
790 xfs_dabuf_t *bp;
791 int retval;
792
793 dp = args->dp;
794 ASSERT(dp != NULL);
795 retval = xfs_da_get_buf(args->trans, dp, blkno, -1, &bp, XFS_DATA_FORK);
796 if (retval)
797 return(retval);
798 ASSERT(bp != NULL);
799 leaf = bp->data;
800 memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount));
801 hdr = &leaf->hdr;
802 INT_SET(hdr->info.magic, ARCH_CONVERT, XFS_DIR_LEAF_MAGIC);
803 INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount));
804 if (!hdr->firstused)
805 INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount) - 1);
806 INT_SET(hdr->freemap[0].base, ARCH_CONVERT, sizeof(xfs_dir_leaf_hdr_t));
807 INT_SET(hdr->freemap[0].size, ARCH_CONVERT, INT_GET(hdr->firstused, ARCH_CONVERT) - INT_GET(hdr->freemap[0].base, ARCH_CONVERT));
808
809 xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1);
810
811 *bpp = bp;
812 return(0);
813}
814
815/*
816 * Split the leaf node, rebalance, then add the new entry.
817 */
818int
819xfs_dir_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
820 xfs_da_state_blk_t *newblk)
821{
822 xfs_dablk_t blkno;
823 xfs_da_args_t *args;
824 int error;
825
826 /*
827 * Allocate space for a new leaf node.
828 */
829 args = state->args;
830 ASSERT(args != NULL);
831 ASSERT(oldblk->magic == XFS_DIR_LEAF_MAGIC);
832 error = xfs_da_grow_inode(args, &blkno);
833 if (error)
834 return(error);
835 error = xfs_dir_leaf_create(args, blkno, &newblk->bp);
836 if (error)
837 return(error);
838 newblk->blkno = blkno;
839 newblk->magic = XFS_DIR_LEAF_MAGIC;
840
841 /*
842 * Rebalance the entries across the two leaves.
843 */
844 xfs_dir_leaf_rebalance(state, oldblk, newblk);
845 error = xfs_da_blk_link(state, oldblk, newblk);
846 if (error)
847 return(error);
848
849 /*
850 * Insert the new entry in the correct block.
851 */
852 if (state->inleaf) {
853 error = xfs_dir_leaf_add(oldblk->bp, args, oldblk->index);
854 } else {
855 error = xfs_dir_leaf_add(newblk->bp, args, newblk->index);
856 }
857
858 /*
859 * Update last hashval in each block since we added the name.
860 */
861 oldblk->hashval = xfs_dir_leaf_lasthash(oldblk->bp, NULL);
862 newblk->hashval = xfs_dir_leaf_lasthash(newblk->bp, NULL);
863 return(error);
864}
865
866/*
867 * Add a name to the leaf directory structure.
868 *
869 * Must take into account fragmented leaves and leaves where spacemap has
870 * lost some freespace information (ie: holes).
871 */
872int
873xfs_dir_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args, int index)
874{
875 xfs_dir_leafblock_t *leaf;
876 xfs_dir_leaf_hdr_t *hdr;
877 xfs_dir_leaf_map_t *map;
878 int tablesize, entsize, sum, i, tmp, error;
879
880 leaf = bp->data;
881 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
882 ASSERT((index >= 0) && (index <= INT_GET(leaf->hdr.count, ARCH_CONVERT)));
883 hdr = &leaf->hdr;
884 entsize = XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen);
885
886 /*
887 * Search through freemap for first-fit on new name length.
888 * (may need to figure in size of entry struct too)
889 */
890 tablesize = (INT_GET(hdr->count, ARCH_CONVERT) + 1) * (uint)sizeof(xfs_dir_leaf_entry_t)
891 + (uint)sizeof(xfs_dir_leaf_hdr_t);
892 map = &hdr->freemap[XFS_DIR_LEAF_MAPSIZE-1];
893 for (sum = 0, i = XFS_DIR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {
894 if (tablesize > INT_GET(hdr->firstused, ARCH_CONVERT)) {
895 sum += INT_GET(map->size, ARCH_CONVERT);
896 continue;
897 }
898 if (!map->size)
899 continue; /* no space in this map */
900 tmp = entsize;
901 if (INT_GET(map->base, ARCH_CONVERT) < INT_GET(hdr->firstused, ARCH_CONVERT))
902 tmp += (uint)sizeof(xfs_dir_leaf_entry_t);
903 if (INT_GET(map->size, ARCH_CONVERT) >= tmp) {
904 if (!args->justcheck)
905 xfs_dir_leaf_add_work(bp, args, index, i);
906 return(0);
907 }
908 sum += INT_GET(map->size, ARCH_CONVERT);
909 }
910
911 /*
912 * If there are no holes in the address space of the block,
913 * and we don't have enough freespace, then compaction will do us
914 * no good and we should just give up.
915 */
916 if (!hdr->holes && (sum < entsize))
917 return(XFS_ERROR(ENOSPC));
918
919 /*
920 * Compact the entries to coalesce free space.
921 * Pass the justcheck flag so the checking pass can return
922 * an error, without changing anything, if it won't fit.
923 */
924 error = xfs_dir_leaf_compact(args->trans, bp,
925 args->total == 0 ?
926 entsize +
927 (uint)sizeof(xfs_dir_leaf_entry_t) : 0,
928 args->justcheck);
929 if (error)
930 return(error);
931 /*
932 * After compaction, the block is guaranteed to have only one
933 * free region, in freemap[0]. If it is not big enough, give up.
934 */
935 if (INT_GET(hdr->freemap[0].size, ARCH_CONVERT) <
936 (entsize + (uint)sizeof(xfs_dir_leaf_entry_t)))
937 return(XFS_ERROR(ENOSPC));
938
939 if (!args->justcheck)
940 xfs_dir_leaf_add_work(bp, args, index, 0);
941 return(0);
942}
943
944/*
945 * Add a name to a leaf directory structure.
946 */
947STATIC void
948xfs_dir_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int index,
949 int mapindex)
950{
951 xfs_dir_leafblock_t *leaf;
952 xfs_dir_leaf_hdr_t *hdr;
953 xfs_dir_leaf_entry_t *entry;
954 xfs_dir_leaf_name_t *namest;
955 xfs_dir_leaf_map_t *map;
956 /* REFERENCED */
957 xfs_mount_t *mp;
958 int tmp, i;
959
960 leaf = bp->data;
961 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
962 hdr = &leaf->hdr;
963 ASSERT((mapindex >= 0) && (mapindex < XFS_DIR_LEAF_MAPSIZE));
964 ASSERT((index >= 0) && (index <= INT_GET(hdr->count, ARCH_CONVERT)));
965
966 /*
967 * Force open some space in the entry array and fill it in.
968 */
969 entry = &leaf->entries[index];
970 if (index < INT_GET(hdr->count, ARCH_CONVERT)) {
971 tmp = INT_GET(hdr->count, ARCH_CONVERT) - index;
972 tmp *= (uint)sizeof(xfs_dir_leaf_entry_t);
973 memmove(entry + 1, entry, tmp);
974 xfs_da_log_buf(args->trans, bp,
975 XFS_DA_LOGRANGE(leaf, entry, tmp + (uint)sizeof(*entry)));
976 }
977 INT_MOD(hdr->count, ARCH_CONVERT, +1);
978
979 /*
980 * Allocate space for the new string (at the end of the run).
981 */
982 map = &hdr->freemap[mapindex];
983 mp = args->trans->t_mountp;
984 ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
985 ASSERT(INT_GET(map->size, ARCH_CONVERT) >= XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen));
986 ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
987 INT_MOD(map->size, ARCH_CONVERT, -(XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen)));
988 INT_SET(entry->nameidx, ARCH_CONVERT, INT_GET(map->base, ARCH_CONVERT) + INT_GET(map->size, ARCH_CONVERT));
989 INT_SET(entry->hashval, ARCH_CONVERT, args->hashval);
990 entry->namelen = args->namelen;
991 xfs_da_log_buf(args->trans, bp,
992 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
993
994 /*
995 * Copy the string and inode number into the new space.
996 */
997 namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
998 XFS_DIR_SF_PUT_DIRINO(&args->inumber, &namest->inumber);
999 memcpy(namest->name, args->name, args->namelen);
1000 xfs_da_log_buf(args->trans, bp,
1001 XFS_DA_LOGRANGE(leaf, namest, XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry)));
1002
1003 /*
1004 * Update the control info for this leaf node
1005 */
1006 if (INT_GET(entry->nameidx, ARCH_CONVERT) < INT_GET(hdr->firstused, ARCH_CONVERT))
1007 INT_COPY(hdr->firstused, entry->nameidx, ARCH_CONVERT);
1008 ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) >= ((INT_GET(hdr->count, ARCH_CONVERT)*sizeof(*entry))+sizeof(*hdr)));
1009 tmp = (INT_GET(hdr->count, ARCH_CONVERT)-1) * (uint)sizeof(xfs_dir_leaf_entry_t)
1010 + (uint)sizeof(xfs_dir_leaf_hdr_t);
1011 map = &hdr->freemap[0];
1012 for (i = 0; i < XFS_DIR_LEAF_MAPSIZE; map++, i++) {
1013 if (INT_GET(map->base, ARCH_CONVERT) == tmp) {
1014 INT_MOD(map->base, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_entry_t));
1015 INT_MOD(map->size, ARCH_CONVERT, -((uint)sizeof(xfs_dir_leaf_entry_t)));
1016 }
1017 }
1018 INT_MOD(hdr->namebytes, ARCH_CONVERT, args->namelen);
1019 xfs_da_log_buf(args->trans, bp,
1020 XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
1021}
1022
1023/*
1024 * Garbage collect a leaf directory block by copying it to a new buffer.
1025 */
1026STATIC int
1027xfs_dir_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp, int musthave,
1028 int justcheck)
1029{
1030 xfs_dir_leafblock_t *leaf_s, *leaf_d;
1031 xfs_dir_leaf_hdr_t *hdr_s, *hdr_d;
1032 xfs_mount_t *mp;
1033 char *tmpbuffer;
1034 char *tmpbuffer2=NULL;
1035 int rval;
1036 int lbsize;
1037
1038 mp = trans->t_mountp;
1039 lbsize = XFS_LBSIZE(mp);
1040 tmpbuffer = kmem_alloc(lbsize, KM_SLEEP);
1041 ASSERT(tmpbuffer != NULL);
1042 memcpy(tmpbuffer, bp->data, lbsize);
1043
1044 /*
1045 * Make a second copy in case xfs_dir_leaf_moveents()
1046 * below destroys the original.
1047 */
1048 if (musthave || justcheck) {
1049 tmpbuffer2 = kmem_alloc(lbsize, KM_SLEEP);
1050 memcpy(tmpbuffer2, bp->data, lbsize);
1051 }
1052 memset(bp->data, 0, lbsize);
1053
1054 /*
1055 * Copy basic information
1056 */
1057 leaf_s = (xfs_dir_leafblock_t *)tmpbuffer;
1058 leaf_d = bp->data;
1059 hdr_s = &leaf_s->hdr;
1060 hdr_d = &leaf_d->hdr;
1061 hdr_d->info = hdr_s->info; /* struct copy */
1062 INT_SET(hdr_d->firstused, ARCH_CONVERT, lbsize);
1063 if (!hdr_d->firstused)
1064 INT_SET(hdr_d->firstused, ARCH_CONVERT, lbsize - 1);
1065 hdr_d->namebytes = 0;
1066 hdr_d->count = 0;
1067 hdr_d->holes = 0;
1068 INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, sizeof(xfs_dir_leaf_hdr_t));
1069 INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, INT_GET(hdr_d->firstused, ARCH_CONVERT) - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
1070
1071 /*
1072 * Copy all entry's in the same (sorted) order,
1073 * but allocate filenames packed and in sequence.
1074 * This changes the source (leaf_s) as well.
1075 */
1076 xfs_dir_leaf_moveents(leaf_s, 0, leaf_d, 0, (int)INT_GET(hdr_s->count, ARCH_CONVERT), mp);
1077
1078 if (musthave && INT_GET(hdr_d->freemap[0].size, ARCH_CONVERT) < musthave)
1079 rval = XFS_ERROR(ENOSPC);
1080 else
1081 rval = 0;
1082
1083 if (justcheck || rval == ENOSPC) {
1084 ASSERT(tmpbuffer2);
1085 memcpy(bp->data, tmpbuffer2, lbsize);
1086 } else {
1087 xfs_da_log_buf(trans, bp, 0, lbsize - 1);
1088 }
1089
1090 kmem_free(tmpbuffer, lbsize);
1091 if (musthave || justcheck)
1092 kmem_free(tmpbuffer2, lbsize);
1093 return(rval);
1094}
1095
1096/*
1097 * Redistribute the directory entries between two leaf nodes,
1098 * taking into account the size of the new entry.
1099 *
1100 * NOTE: if new block is empty, then it will get the upper half of old block.
1101 */
1102STATIC void
1103xfs_dir_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
1104 xfs_da_state_blk_t *blk2)
1105{
1106 xfs_da_state_blk_t *tmp_blk;
1107 xfs_dir_leafblock_t *leaf1, *leaf2;
1108 xfs_dir_leaf_hdr_t *hdr1, *hdr2;
1109 int count, totallen, max, space, swap;
1110
1111 /*
1112 * Set up environment.
1113 */
1114 ASSERT(blk1->magic == XFS_DIR_LEAF_MAGIC);
1115 ASSERT(blk2->magic == XFS_DIR_LEAF_MAGIC);
1116 leaf1 = blk1->bp->data;
1117 leaf2 = blk2->bp->data;
1118 ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1119 ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1120
1121 /*
1122 * Check ordering of blocks, reverse if it makes things simpler.
1123 */
1124 swap = 0;
1125 if (xfs_dir_leaf_order(blk1->bp, blk2->bp)) {
1126 tmp_blk = blk1;
1127 blk1 = blk2;
1128 blk2 = tmp_blk;
1129 leaf1 = blk1->bp->data;
1130 leaf2 = blk2->bp->data;
1131 swap = 1;
1132 }
1133 hdr1 = &leaf1->hdr;
1134 hdr2 = &leaf2->hdr;
1135
1136 /*
1137 * Examine entries until we reduce the absolute difference in
1138 * byte usage between the two blocks to a minimum. Then get
1139 * the direction to copy and the number of elements to move.
1140 */
1141 state->inleaf = xfs_dir_leaf_figure_balance(state, blk1, blk2,
1142 &count, &totallen);
1143 if (swap)
1144 state->inleaf = !state->inleaf;
1145
1146 /*
1147 * Move any entries required from leaf to leaf:
1148 */
1149 if (count < INT_GET(hdr1->count, ARCH_CONVERT)) {
1150 /*
1151 * Figure the total bytes to be added to the destination leaf.
1152 */
1153 count = INT_GET(hdr1->count, ARCH_CONVERT) - count; /* number entries being moved */
1154 space = INT_GET(hdr1->namebytes, ARCH_CONVERT) - totallen;
1155 space += count * ((uint)sizeof(xfs_dir_leaf_name_t)-1);
1156 space += count * (uint)sizeof(xfs_dir_leaf_entry_t);
1157
1158 /*
1159 * leaf2 is the destination, compact it if it looks tight.
1160 */
1161 max = INT_GET(hdr2->firstused, ARCH_CONVERT) - (uint)sizeof(xfs_dir_leaf_hdr_t);
1162 max -= INT_GET(hdr2->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t);
1163 if (space > max) {
1164 xfs_dir_leaf_compact(state->args->trans, blk2->bp,
1165 0, 0);
1166 }
1167
1168 /*
1169 * Move high entries from leaf1 to low end of leaf2.
1170 */
1171 xfs_dir_leaf_moveents(leaf1, INT_GET(hdr1->count, ARCH_CONVERT) - count,
1172 leaf2, 0, count, state->mp);
1173
1174 xfs_da_log_buf(state->args->trans, blk1->bp, 0,
1175 state->blocksize-1);
1176 xfs_da_log_buf(state->args->trans, blk2->bp, 0,
1177 state->blocksize-1);
1178
1179 } else if (count > INT_GET(hdr1->count, ARCH_CONVERT)) {
1180 /*
1181 * Figure the total bytes to be added to the destination leaf.
1182 */
1183 count -= INT_GET(hdr1->count, ARCH_CONVERT); /* number entries being moved */
1184 space = totallen - INT_GET(hdr1->namebytes, ARCH_CONVERT);
1185 space += count * ((uint)sizeof(xfs_dir_leaf_name_t)-1);
1186 space += count * (uint)sizeof(xfs_dir_leaf_entry_t);
1187
1188 /*
1189 * leaf1 is the destination, compact it if it looks tight.
1190 */
1191 max = INT_GET(hdr1->firstused, ARCH_CONVERT) - (uint)sizeof(xfs_dir_leaf_hdr_t);
1192 max -= INT_GET(hdr1->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t);
1193 if (space > max) {
1194 xfs_dir_leaf_compact(state->args->trans, blk1->bp,
1195 0, 0);
1196 }
1197
1198 /*
1199 * Move low entries from leaf2 to high end of leaf1.
1200 */
1201 xfs_dir_leaf_moveents(leaf2, 0, leaf1, (int)INT_GET(hdr1->count, ARCH_CONVERT),
1202 count, state->mp);
1203
1204 xfs_da_log_buf(state->args->trans, blk1->bp, 0,
1205 state->blocksize-1);
1206 xfs_da_log_buf(state->args->trans, blk2->bp, 0,
1207 state->blocksize-1);
1208 }
1209
1210 /*
1211 * Copy out last hashval in each block for B-tree code.
1212 */
1213 blk1->hashval = INT_GET(leaf1->entries[ INT_GET(leaf1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
1214 blk2->hashval = INT_GET(leaf2->entries[ INT_GET(leaf2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
1215
1216 /*
1217 * Adjust the expected index for insertion.
1218 * GROT: this doesn't work unless blk2 was originally empty.
1219 */
1220 if (!state->inleaf) {
1221 blk2->index = blk1->index - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
1222 }
1223}
1224
1225/*
1226 * Examine entries until we reduce the absolute difference in
1227 * byte usage between the two blocks to a minimum.
1228 * GROT: Is this really necessary? With other than a 512 byte blocksize,
1229 * GROT: there will always be enough room in either block for a new entry.
1230 * GROT: Do a double-split for this case?
1231 */
1232STATIC int
1233xfs_dir_leaf_figure_balance(xfs_da_state_t *state,
1234 xfs_da_state_blk_t *blk1,
1235 xfs_da_state_blk_t *blk2,
1236 int *countarg, int *namebytesarg)
1237{
1238 xfs_dir_leafblock_t *leaf1, *leaf2;
1239 xfs_dir_leaf_hdr_t *hdr1, *hdr2;
1240 xfs_dir_leaf_entry_t *entry;
1241 int count, max, totallen, half;
1242 int lastdelta, foundit, tmp;
1243
1244 /*
1245 * Set up environment.
1246 */
1247 leaf1 = blk1->bp->data;
1248 leaf2 = blk2->bp->data;
1249 hdr1 = &leaf1->hdr;
1250 hdr2 = &leaf2->hdr;
1251 foundit = 0;
1252 totallen = 0;
1253
1254 /*
1255 * Examine entries until we reduce the absolute difference in
1256 * byte usage between the two blocks to a minimum.
1257 */
1258 max = INT_GET(hdr1->count, ARCH_CONVERT) + INT_GET(hdr2->count, ARCH_CONVERT);
1259 half = (max+1) * (uint)(sizeof(*entry)+sizeof(xfs_dir_leaf_entry_t)-1);
1260 half += INT_GET(hdr1->namebytes, ARCH_CONVERT) + INT_GET(hdr2->namebytes, ARCH_CONVERT) + state->args->namelen;
1261 half /= 2;
1262 lastdelta = state->blocksize;
1263 entry = &leaf1->entries[0];
1264 for (count = 0; count < max; entry++, count++) {
1265
1266#define XFS_DIR_ABS(A) (((A) < 0) ? -(A) : (A))
1267 /*
1268 * The new entry is in the first block, account for it.
1269 */
1270 if (count == blk1->index) {
1271 tmp = totallen + (uint)sizeof(*entry)
1272 + XFS_DIR_LEAF_ENTSIZE_BYNAME(state->args->namelen);
1273 if (XFS_DIR_ABS(half - tmp) > lastdelta)
1274 break;
1275 lastdelta = XFS_DIR_ABS(half - tmp);
1276 totallen = tmp;
1277 foundit = 1;
1278 }
1279
1280 /*
1281 * Wrap around into the second block if necessary.
1282 */
1283 if (count == INT_GET(hdr1->count, ARCH_CONVERT)) {
1284 leaf1 = leaf2;
1285 entry = &leaf1->entries[0];
1286 }
1287
1288 /*
1289 * Figure out if next leaf entry would be too much.
1290 */
1291 tmp = totallen + (uint)sizeof(*entry)
1292 + XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry);
1293 if (XFS_DIR_ABS(half - tmp) > lastdelta)
1294 break;
1295 lastdelta = XFS_DIR_ABS(half - tmp);
1296 totallen = tmp;
1297#undef XFS_DIR_ABS
1298 }
1299
1300 /*
1301 * Calculate the number of namebytes that will end up in lower block.
1302 * If new entry not in lower block, fix up the count.
1303 */
1304 totallen -=
1305 count * (uint)(sizeof(*entry)+sizeof(xfs_dir_leaf_entry_t)-1);
1306 if (foundit) {
1307 totallen -= (sizeof(*entry)+sizeof(xfs_dir_leaf_entry_t)-1) +
1308 state->args->namelen;
1309 }
1310
1311 *countarg = count;
1312 *namebytesarg = totallen;
1313 return(foundit);
1314}
1315
1316/*========================================================================
1317 * Routines used for shrinking the Btree.
1318 *========================================================================*/
1319
1320/*
1321 * Check a leaf block and its neighbors to see if the block should be
1322 * collapsed into one or the other neighbor. Always keep the block
1323 * with the smaller block number.
1324 * If the current block is over 50% full, don't try to join it, return 0.
1325 * If the block is empty, fill in the state structure and return 2.
1326 * If it can be collapsed, fill in the state structure and return 1.
1327 * If nothing can be done, return 0.
1328 */
1329int
1330xfs_dir_leaf_toosmall(xfs_da_state_t *state, int *action)
1331{
1332 xfs_dir_leafblock_t *leaf;
1333 xfs_da_state_blk_t *blk;
1334 xfs_da_blkinfo_t *info;
1335 int count, bytes, forward, error, retval, i;
1336 xfs_dablk_t blkno;
1337 xfs_dabuf_t *bp;
1338
1339 /*
1340 * Check for the degenerate case of the block being over 50% full.
1341 * If so, it's not worth even looking to see if we might be able
1342 * to coalesce with a sibling.
1343 */
1344 blk = &state->path.blk[ state->path.active-1 ];
1345 info = blk->bp->data;
1346 ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1347 leaf = (xfs_dir_leafblock_t *)info;
1348 count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
1349 bytes = (uint)sizeof(xfs_dir_leaf_hdr_t) +
1350 count * (uint)sizeof(xfs_dir_leaf_entry_t) +
1351 count * ((uint)sizeof(xfs_dir_leaf_name_t)-1) +
1352 INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
1353 if (bytes > (state->blocksize >> 1)) {
1354 *action = 0; /* blk over 50%, don't try to join */
1355 return(0);
1356 }
1357
1358 /*
1359 * Check for the degenerate case of the block being empty.
1360 * If the block is empty, we'll simply delete it, no need to
1361 * coalesce it with a sibling block. We choose (aribtrarily)
1362 * to merge with the forward block unless it is NULL.
1363 */
1364 if (count == 0) {
1365 /*
1366 * Make altpath point to the block we want to keep and
1367 * path point to the block we want to drop (this one).
1368 */
1369 forward = info->forw;
1370 memcpy(&state->altpath, &state->path, sizeof(state->path));
1371 error = xfs_da_path_shift(state, &state->altpath, forward,
1372 0, &retval);
1373 if (error)
1374 return(error);
1375 if (retval) {
1376 *action = 0;
1377 } else {
1378 *action = 2;
1379 }
1380 return(0);
1381 }
1382
1383 /*
1384 * Examine each sibling block to see if we can coalesce with
1385 * at least 25% free space to spare. We need to figure out
1386 * whether to merge with the forward or the backward block.
1387 * We prefer coalescing with the lower numbered sibling so as
1388 * to shrink a directory over time.
1389 */
1390 forward = (INT_GET(info->forw, ARCH_CONVERT) < INT_GET(info->back, ARCH_CONVERT)); /* start with smaller blk num */
1391 for (i = 0; i < 2; forward = !forward, i++) {
1392 if (forward)
1393 blkno = INT_GET(info->forw, ARCH_CONVERT);
1394 else
1395 blkno = INT_GET(info->back, ARCH_CONVERT);
1396 if (blkno == 0)
1397 continue;
1398 error = xfs_da_read_buf(state->args->trans, state->args->dp,
1399 blkno, -1, &bp,
1400 XFS_DATA_FORK);
1401 if (error)
1402 return(error);
1403 ASSERT(bp != NULL);
1404
1405 leaf = (xfs_dir_leafblock_t *)info;
1406 count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
1407 bytes = state->blocksize - (state->blocksize>>2);
1408 bytes -= INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
1409 leaf = bp->data;
1410 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1411 count += INT_GET(leaf->hdr.count, ARCH_CONVERT);
1412 bytes -= INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
1413 bytes -= count * ((uint)sizeof(xfs_dir_leaf_name_t) - 1);
1414 bytes -= count * (uint)sizeof(xfs_dir_leaf_entry_t);
1415 bytes -= (uint)sizeof(xfs_dir_leaf_hdr_t);
1416 if (bytes >= 0)
1417 break; /* fits with at least 25% to spare */
1418
1419 xfs_da_brelse(state->args->trans, bp);
1420 }
1421 if (i >= 2) {
1422 *action = 0;
1423 return(0);
1424 }
1425 xfs_da_buf_done(bp);
1426
1427 /*
1428 * Make altpath point to the block we want to keep (the lower
1429 * numbered block) and path point to the block we want to drop.
1430 */
1431 memcpy(&state->altpath, &state->path, sizeof(state->path));
1432 if (blkno < blk->blkno) {
1433 error = xfs_da_path_shift(state, &state->altpath, forward,
1434 0, &retval);
1435 } else {
1436 error = xfs_da_path_shift(state, &state->path, forward,
1437 0, &retval);
1438 }
1439 if (error)
1440 return(error);
1441 if (retval) {
1442 *action = 0;
1443 } else {
1444 *action = 1;
1445 }
1446 return(0);
1447}
1448
1449/*
1450 * Remove a name from the leaf directory structure.
1451 *
1452 * Return 1 if leaf is less than 37% full, 0 if >= 37% full.
1453 * If two leaves are 37% full, when combined they will leave 25% free.
1454 */
1455int
1456xfs_dir_leaf_remove(xfs_trans_t *trans, xfs_dabuf_t *bp, int index)
1457{
1458 xfs_dir_leafblock_t *leaf;
1459 xfs_dir_leaf_hdr_t *hdr;
1460 xfs_dir_leaf_map_t *map;
1461 xfs_dir_leaf_entry_t *entry;
1462 xfs_dir_leaf_name_t *namest;
1463 int before, after, smallest, entsize;
1464 int tablesize, tmp, i;
1465 xfs_mount_t *mp;
1466
1467 leaf = bp->data;
1468 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1469 hdr = &leaf->hdr;
1470 mp = trans->t_mountp;
1471 ASSERT((INT_GET(hdr->count, ARCH_CONVERT) > 0) && (INT_GET(hdr->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)));
1472 ASSERT((index >= 0) && (index < INT_GET(hdr->count, ARCH_CONVERT)));
1473 ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) >= ((INT_GET(hdr->count, ARCH_CONVERT)*sizeof(*entry))+sizeof(*hdr)));
1474 entry = &leaf->entries[index];
1475 ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) >= INT_GET(hdr->firstused, ARCH_CONVERT));
1476 ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp));
1477
1478 /*
1479 * Scan through free region table:
1480 * check for adjacency of free'd entry with an existing one,
1481 * find smallest free region in case we need to replace it,
1482 * adjust any map that borders the entry table,
1483 */
1484 tablesize = INT_GET(hdr->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t)
1485 + (uint)sizeof(xfs_dir_leaf_hdr_t);
1486 map = &hdr->freemap[0];
1487 tmp = INT_GET(map->size, ARCH_CONVERT);
1488 before = after = -1;
1489 smallest = XFS_DIR_LEAF_MAPSIZE - 1;
1490 entsize = XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry);
1491 for (i = 0; i < XFS_DIR_LEAF_MAPSIZE; map++, i++) {
1492 ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
1493 ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
1494 if (INT_GET(map->base, ARCH_CONVERT) == tablesize) {
1495 INT_MOD(map->base, ARCH_CONVERT, -((uint)sizeof(xfs_dir_leaf_entry_t)));
1496 INT_MOD(map->size, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_entry_t));
1497 }
1498
1499 if ((INT_GET(map->base, ARCH_CONVERT) + INT_GET(map->size, ARCH_CONVERT)) == INT_GET(entry->nameidx, ARCH_CONVERT)) {
1500 before = i;
1501 } else if (INT_GET(map->base, ARCH_CONVERT) == (INT_GET(entry->nameidx, ARCH_CONVERT) + entsize)) {
1502 after = i;
1503 } else if (INT_GET(map->size, ARCH_CONVERT) < tmp) {
1504 tmp = INT_GET(map->size, ARCH_CONVERT);
1505 smallest = i;
1506 }
1507 }
1508
1509 /*
1510 * Coalesce adjacent freemap regions,
1511 * or replace the smallest region.
1512 */
1513 if ((before >= 0) || (after >= 0)) {
1514 if ((before >= 0) && (after >= 0)) {
1515 map = &hdr->freemap[before];
1516 INT_MOD(map->size, ARCH_CONVERT, entsize);
1517 INT_MOD(map->size, ARCH_CONVERT, INT_GET(hdr->freemap[after].size, ARCH_CONVERT));
1518 hdr->freemap[after].base = 0;
1519 hdr->freemap[after].size = 0;
1520 } else if (before >= 0) {
1521 map = &hdr->freemap[before];
1522 INT_MOD(map->size, ARCH_CONVERT, entsize);
1523 } else {
1524 map = &hdr->freemap[after];
1525 INT_COPY(map->base, entry->nameidx, ARCH_CONVERT);
1526 INT_MOD(map->size, ARCH_CONVERT, entsize);
1527 }
1528 } else {
1529 /*
1530 * Replace smallest region (if it is smaller than free'd entry)
1531 */
1532 map = &hdr->freemap[smallest];
1533 if (INT_GET(map->size, ARCH_CONVERT) < entsize) {
1534 INT_COPY(map->base, entry->nameidx, ARCH_CONVERT);
1535 INT_SET(map->size, ARCH_CONVERT, entsize);
1536 }
1537 }
1538
1539 /*
1540 * Did we remove the first entry?
1541 */
1542 if (INT_GET(entry->nameidx, ARCH_CONVERT) == INT_GET(hdr->firstused, ARCH_CONVERT))
1543 smallest = 1;
1544 else
1545 smallest = 0;
1546
1547 /*
1548 * Compress the remaining entries and zero out the removed stuff.
1549 */
1550 namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
1551 memset((char *)namest, 0, entsize);
1552 xfs_da_log_buf(trans, bp, XFS_DA_LOGRANGE(leaf, namest, entsize));
1553
1554 INT_MOD(hdr->namebytes, ARCH_CONVERT, -(entry->namelen));
1555 tmp = (INT_GET(hdr->count, ARCH_CONVERT) - index) * (uint)sizeof(xfs_dir_leaf_entry_t);
1556 memmove(entry, entry + 1, tmp);
1557 INT_MOD(hdr->count, ARCH_CONVERT, -1);
1558 xfs_da_log_buf(trans, bp,
1559 XFS_DA_LOGRANGE(leaf, entry, tmp + (uint)sizeof(*entry)));
1560 entry = &leaf->entries[INT_GET(hdr->count, ARCH_CONVERT)];
1561 memset((char *)entry, 0, sizeof(xfs_dir_leaf_entry_t));
1562
1563 /*
1564 * If we removed the first entry, re-find the first used byte
1565 * in the name area. Note that if the entry was the "firstused",
1566 * then we don't have a "hole" in our block resulting from
1567 * removing the name.
1568 */
1569 if (smallest) {
1570 tmp = XFS_LBSIZE(mp);
1571 entry = &leaf->entries[0];
1572 for (i = INT_GET(hdr->count, ARCH_CONVERT)-1; i >= 0; entry++, i--) {
1573 ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) >= INT_GET(hdr->firstused, ARCH_CONVERT));
1574 ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp));
1575 if (INT_GET(entry->nameidx, ARCH_CONVERT) < tmp)
1576 tmp = INT_GET(entry->nameidx, ARCH_CONVERT);
1577 }
1578 INT_SET(hdr->firstused, ARCH_CONVERT, tmp);
1579 if (!hdr->firstused)
1580 INT_SET(hdr->firstused, ARCH_CONVERT, tmp - 1);
1581 } else {
1582 hdr->holes = 1; /* mark as needing compaction */
1583 }
1584
1585 xfs_da_log_buf(trans, bp, XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
1586
1587 /*
1588 * Check if leaf is less than 50% full, caller may want to
1589 * "join" the leaf with a sibling if so.
1590 */
1591 tmp = (uint)sizeof(xfs_dir_leaf_hdr_t);
1592 tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t);
1593 tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT) * ((uint)sizeof(xfs_dir_leaf_name_t) - 1);
1594 tmp += INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
1595 if (tmp < mp->m_dir_magicpct)
1596 return(1); /* leaf is < 37% full */
1597 return(0);
1598}
1599
1600/*
1601 * Move all the directory entries from drop_leaf into save_leaf.
1602 */
1603void
1604xfs_dir_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
1605 xfs_da_state_blk_t *save_blk)
1606{
1607 xfs_dir_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf;
1608 xfs_dir_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr;
1609 xfs_mount_t *mp;
1610 char *tmpbuffer;
1611
1612 /*
1613 * Set up environment.
1614 */
1615 mp = state->mp;
1616 ASSERT(drop_blk->magic == XFS_DIR_LEAF_MAGIC);
1617 ASSERT(save_blk->magic == XFS_DIR_LEAF_MAGIC);
1618 drop_leaf = drop_blk->bp->data;
1619 save_leaf = save_blk->bp->data;
1620 ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1621 ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1622 drop_hdr = &drop_leaf->hdr;
1623 save_hdr = &save_leaf->hdr;
1624
1625 /*
1626 * Save last hashval from dying block for later Btree fixup.
1627 */
1628 drop_blk->hashval = INT_GET(drop_leaf->entries[ drop_leaf->hdr.count-1 ].hashval, ARCH_CONVERT);
1629
1630 /*
1631 * Check if we need a temp buffer, or can we do it in place.
1632 * Note that we don't check "leaf" for holes because we will
1633 * always be dropping it, toosmall() decided that for us already.
1634 */
1635 if (save_hdr->holes == 0) {
1636 /*
1637 * dest leaf has no holes, so we add there. May need
1638 * to make some room in the entry array.
1639 */
1640 if (xfs_dir_leaf_order(save_blk->bp, drop_blk->bp)) {
1641 xfs_dir_leaf_moveents(drop_leaf, 0, save_leaf, 0,
1642 (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
1643 } else {
1644 xfs_dir_leaf_moveents(drop_leaf, 0,
1645 save_leaf, INT_GET(save_hdr->count, ARCH_CONVERT),
1646 (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
1647 }
1648 } else {
1649 /*
1650 * Destination has holes, so we make a temporary copy
1651 * of the leaf and add them both to that.
1652 */
1653 tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP);
1654 ASSERT(tmpbuffer != NULL);
1655 memset(tmpbuffer, 0, state->blocksize);
1656 tmp_leaf = (xfs_dir_leafblock_t *)tmpbuffer;
1657 tmp_hdr = &tmp_leaf->hdr;
1658 tmp_hdr->info = save_hdr->info; /* struct copy */
1659 tmp_hdr->count = 0;
1660 INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize);
1661 if (!tmp_hdr->firstused)
1662 INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize - 1);
1663 tmp_hdr->namebytes = 0;
1664 if (xfs_dir_leaf_order(save_blk->bp, drop_blk->bp)) {
1665 xfs_dir_leaf_moveents(drop_leaf, 0, tmp_leaf, 0,
1666 (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
1667 xfs_dir_leaf_moveents(save_leaf, 0,
1668 tmp_leaf, INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
1669 (int)INT_GET(save_hdr->count, ARCH_CONVERT), mp);
1670 } else {
1671 xfs_dir_leaf_moveents(save_leaf, 0, tmp_leaf, 0,
1672 (int)INT_GET(save_hdr->count, ARCH_CONVERT), mp);
1673 xfs_dir_leaf_moveents(drop_leaf, 0,
1674 tmp_leaf, INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
1675 (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
1676 }
1677 memcpy(save_leaf, tmp_leaf, state->blocksize);
1678 kmem_free(tmpbuffer, state->blocksize);
1679 }
1680
1681 xfs_da_log_buf(state->args->trans, save_blk->bp, 0,
1682 state->blocksize - 1);
1683
1684 /*
1685 * Copy out last hashval in each block for B-tree code.
1686 */
1687 save_blk->hashval = INT_GET(save_leaf->entries[ INT_GET(save_leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
1688}
1689
1690/*========================================================================
1691 * Routines used for finding things in the Btree.
1692 *========================================================================*/
1693
1694/*
1695 * Look up a name in a leaf directory structure.
1696 * This is the internal routine, it uses the caller's buffer.
1697 *
1698 * Note that duplicate keys are allowed, but only check within the
1699 * current leaf node. The Btree code must check in adjacent leaf nodes.
1700 *
1701 * Return in *index the index into the entry[] array of either the found
1702 * entry, or where the entry should have been (insert before that entry).
1703 *
1704 * Don't change the args->inumber unless we find the filename.
1705 */
1706int
1707xfs_dir_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args, int *index)
1708{
1709 xfs_dir_leafblock_t *leaf;
1710 xfs_dir_leaf_entry_t *entry;
1711 xfs_dir_leaf_name_t *namest;
1712 int probe, span;
1713 xfs_dahash_t hashval;
1714
1715 leaf = bp->data;
1716 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1717 ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) < (XFS_LBSIZE(args->dp->i_mount)/8));
1718
1719 /*
1720 * Binary search. (note: small blocks will skip this loop)
1721 */
1722 hashval = args->hashval;
1723 probe = span = INT_GET(leaf->hdr.count, ARCH_CONVERT) / 2;
1724 for (entry = &leaf->entries[probe]; span > 4;
1725 entry = &leaf->entries[probe]) {
1726 span /= 2;
1727 if (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)
1728 probe += span;
1729 else if (INT_GET(entry->hashval, ARCH_CONVERT) > hashval)
1730 probe -= span;
1731 else
1732 break;
1733 }
1734 ASSERT((probe >= 0) && \
1735 ((!leaf->hdr.count) || (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))));
1736 ASSERT((span <= 4) || (INT_GET(entry->hashval, ARCH_CONVERT) == hashval));
1737
1738 /*
1739 * Since we may have duplicate hashval's, find the first matching
1740 * hashval in the leaf.
1741 */
1742 while ((probe > 0) && (INT_GET(entry->hashval, ARCH_CONVERT) >= hashval)) {
1743 entry--;
1744 probe--;
1745 }
1746 while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) && (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)) {
1747 entry++;
1748 probe++;
1749 }
1750 if ((probe == INT_GET(leaf->hdr.count, ARCH_CONVERT)) || (INT_GET(entry->hashval, ARCH_CONVERT) != hashval)) {
1751 *index = probe;
1752 ASSERT(args->oknoent);
1753 return(XFS_ERROR(ENOENT));
1754 }
1755
1756 /*
1757 * Duplicate keys may be present, so search all of them for a match.
1758 */
1759 while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) && (INT_GET(entry->hashval, ARCH_CONVERT) == hashval)) {
1760 namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
1761 if (entry->namelen == args->namelen &&
1762 namest->name[0] == args->name[0] &&
1763 memcmp(args->name, namest->name, args->namelen) == 0) {
1764 XFS_DIR_SF_GET_DIRINO(&namest->inumber, &args->inumber);
1765 *index = probe;
1766 return(XFS_ERROR(EEXIST));
1767 }
1768 entry++;
1769 probe++;
1770 }
1771 *index = probe;
1772 ASSERT(probe == INT_GET(leaf->hdr.count, ARCH_CONVERT) || args->oknoent);
1773 return(XFS_ERROR(ENOENT));
1774}
1775
1776/*========================================================================
1777 * Utility routines.
1778 *========================================================================*/
1779
1780/*
1781 * Move the indicated entries from one leaf to another.
1782 * NOTE: this routine modifies both source and destination leaves.
1783 */
1784/* ARGSUSED */
1785STATIC void
1786xfs_dir_leaf_moveents(xfs_dir_leafblock_t *leaf_s, int start_s,
1787 xfs_dir_leafblock_t *leaf_d, int start_d,
1788 int count, xfs_mount_t *mp)
1789{
1790 xfs_dir_leaf_hdr_t *hdr_s, *hdr_d;
1791 xfs_dir_leaf_entry_t *entry_s, *entry_d;
1792 int tmp, i;
1793
1794 /*
1795 * Check for nothing to do.
1796 */
1797 if (count == 0)
1798 return;
1799
1800 /*
1801 * Set up environment.
1802 */
1803 ASSERT(INT_GET(leaf_s->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1804 ASSERT(INT_GET(leaf_d->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1805 hdr_s = &leaf_s->hdr;
1806 hdr_d = &leaf_d->hdr;
1807 ASSERT((INT_GET(hdr_s->count, ARCH_CONVERT) > 0) && (INT_GET(hdr_s->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)));
1808 ASSERT(INT_GET(hdr_s->firstused, ARCH_CONVERT) >=
1809 ((INT_GET(hdr_s->count, ARCH_CONVERT)*sizeof(*entry_s))+sizeof(*hdr_s)));
1810 ASSERT(INT_GET(hdr_d->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8));
1811 ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >=
1812 ((INT_GET(hdr_d->count, ARCH_CONVERT)*sizeof(*entry_d))+sizeof(*hdr_d)));
1813
1814 ASSERT(start_s < INT_GET(hdr_s->count, ARCH_CONVERT));
1815 ASSERT(start_d <= INT_GET(hdr_d->count, ARCH_CONVERT));
1816 ASSERT(count <= INT_GET(hdr_s->count, ARCH_CONVERT));
1817
1818 /*
1819 * Move the entries in the destination leaf up to make a hole?
1820 */
1821 if (start_d < INT_GET(hdr_d->count, ARCH_CONVERT)) {
1822 tmp = INT_GET(hdr_d->count, ARCH_CONVERT) - start_d;
1823 tmp *= (uint)sizeof(xfs_dir_leaf_entry_t);
1824 entry_s = &leaf_d->entries[start_d];
1825 entry_d = &leaf_d->entries[start_d + count];
1826 memcpy(entry_d, entry_s, tmp);
1827 }
1828
1829 /*
1830 * Copy all entry's in the same (sorted) order,
1831 * but allocate filenames packed and in sequence.
1832 */
1833 entry_s = &leaf_s->entries[start_s];
1834 entry_d = &leaf_d->entries[start_d];
1835 for (i = 0; i < count; entry_s++, entry_d++, i++) {
1836 ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) >= INT_GET(hdr_s->firstused, ARCH_CONVERT));
1837 tmp = XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry_s);
1838 INT_MOD(hdr_d->firstused, ARCH_CONVERT, -(tmp));
1839 entry_d->hashval = entry_s->hashval; /* INT_: direct copy */
1840 INT_COPY(entry_d->nameidx, hdr_d->firstused, ARCH_CONVERT);
1841 entry_d->namelen = entry_s->namelen;
1842 ASSERT(INT_GET(entry_d->nameidx, ARCH_CONVERT) + tmp <= XFS_LBSIZE(mp));
1843 memcpy(XFS_DIR_LEAF_NAMESTRUCT(leaf_d, INT_GET(entry_d->nameidx, ARCH_CONVERT)),
1844 XFS_DIR_LEAF_NAMESTRUCT(leaf_s, INT_GET(entry_s->nameidx, ARCH_CONVERT)), tmp);
1845 ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) + tmp <= XFS_LBSIZE(mp));
1846 memset((char *)XFS_DIR_LEAF_NAMESTRUCT(leaf_s, INT_GET(entry_s->nameidx, ARCH_CONVERT)),
1847 0, tmp);
1848 INT_MOD(hdr_s->namebytes, ARCH_CONVERT, -(entry_d->namelen));
1849 INT_MOD(hdr_d->namebytes, ARCH_CONVERT, entry_d->namelen);
1850 INT_MOD(hdr_s->count, ARCH_CONVERT, -1);
1851 INT_MOD(hdr_d->count, ARCH_CONVERT, +1);
1852 tmp = INT_GET(hdr_d->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t)
1853 + (uint)sizeof(xfs_dir_leaf_hdr_t);
1854 ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= tmp);
1855
1856 }
1857
1858 /*
1859 * Zero out the entries we just copied.
1860 */
1861 if (start_s == INT_GET(hdr_s->count, ARCH_CONVERT)) {
1862 tmp = count * (uint)sizeof(xfs_dir_leaf_entry_t);
1863 entry_s = &leaf_s->entries[start_s];
1864 ASSERT((char *)entry_s + tmp <= (char *)leaf_s + XFS_LBSIZE(mp));
1865 memset((char *)entry_s, 0, tmp);
1866 } else {
1867 /*
1868 * Move the remaining entries down to fill the hole,
1869 * then zero the entries at the top.
1870 */
1871 tmp = INT_GET(hdr_s->count, ARCH_CONVERT) - count;
1872 tmp *= (uint)sizeof(xfs_dir_leaf_entry_t);
1873 entry_s = &leaf_s->entries[start_s + count];
1874 entry_d = &leaf_s->entries[start_s];
1875 memcpy(entry_d, entry_s, tmp);
1876
1877 tmp = count * (uint)sizeof(xfs_dir_leaf_entry_t);
1878 entry_s = &leaf_s->entries[INT_GET(hdr_s->count, ARCH_CONVERT)];
1879 ASSERT((char *)entry_s + tmp <= (char *)leaf_s + XFS_LBSIZE(mp));
1880 memset((char *)entry_s, 0, tmp);
1881 }
1882
1883 /*
1884 * Fill in the freemap information
1885 */
1886 INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_hdr_t));
1887 INT_MOD(hdr_d->freemap[0].base, ARCH_CONVERT, INT_GET(hdr_d->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t));
1888 INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, INT_GET(hdr_d->firstused, ARCH_CONVERT) - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
1889 INT_SET(hdr_d->freemap[1].base, ARCH_CONVERT, (hdr_d->freemap[2].base = 0));
1890 INT_SET(hdr_d->freemap[1].size, ARCH_CONVERT, (hdr_d->freemap[2].size = 0));
1891 hdr_s->holes = 1; /* leaf may not be compact */
1892}
1893
1894/*
1895 * Compare two leaf blocks "order".
1896 */
1897int
1898xfs_dir_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp)
1899{
1900 xfs_dir_leafblock_t *leaf1, *leaf2;
1901
1902 leaf1 = leaf1_bp->data;
1903 leaf2 = leaf2_bp->data;
1904 ASSERT((INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC) &&
1905 (INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC));
1906 if ((INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0) && (INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0) &&
1907 ((INT_GET(leaf2->entries[ 0 ].hashval, ARCH_CONVERT) <
1908 INT_GET(leaf1->entries[ 0 ].hashval, ARCH_CONVERT)) ||
1909 (INT_GET(leaf2->entries[ INT_GET(leaf2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT) <
1910 INT_GET(leaf1->entries[ INT_GET(leaf1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)))) {
1911 return(1);
1912 }
1913 return(0);
1914}
1915
1916/*
1917 * Pick up the last hashvalue from a leaf block.
1918 */
1919xfs_dahash_t
1920xfs_dir_leaf_lasthash(xfs_dabuf_t *bp, int *count)
1921{
1922 xfs_dir_leafblock_t *leaf;
1923
1924 leaf = bp->data;
1925 ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
1926 if (count)
1927 *count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
1928 if (!leaf->hdr.count)
1929 return(0);
1930 return(INT_GET(leaf->entries[ INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT));
1931}
1932
1933/*
1934 * Copy out directory entries for getdents(), for leaf directories.
1935 */
1936int
1937xfs_dir_leaf_getdents_int(
1938 xfs_dabuf_t *bp,
1939 xfs_inode_t *dp,
1940 xfs_dablk_t bno,
1941 uio_t *uio,
1942 int *eobp,
1943 xfs_dirent_t *dbp,
1944 xfs_dir_put_t put,
1945 xfs_daddr_t nextda)
1946{
1947 xfs_dir_leafblock_t *leaf;
1948 xfs_dir_leaf_entry_t *entry;
1949 xfs_dir_leaf_name_t *namest;
1950 int entno, want_entno, i, nextentno;
1951 xfs_mount_t *mp;
1952 xfs_dahash_t cookhash;
1953 xfs_dahash_t nexthash = 0;
1954#if (BITS_PER_LONG == 32)
1955 xfs_dahash_t lasthash = XFS_DA_MAXHASH;
1956#endif
1957 xfs_dir_put_args_t p;
1958
1959 mp = dp->i_mount;
1960 leaf = bp->data;
1961 if (INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC) {
1962 *eobp = 1;
1963 return(XFS_ERROR(ENOENT)); /* XXX wrong code */
1964 }
1965
1966 want_entno = XFS_DA_COOKIE_ENTRY(mp, uio->uio_offset);
1967
1968 cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
1969
1970 xfs_dir_trace_g_dul("leaf: start", dp, uio, leaf);
1971
1972 /*
1973 * Re-find our place.
1974 */
1975 for (i = entno = 0, entry = &leaf->entries[0];
1976 i < INT_GET(leaf->hdr.count, ARCH_CONVERT);
1977 entry++, i++) {
1978
1979 namest = XFS_DIR_LEAF_NAMESTRUCT(leaf,
1980 INT_GET(entry->nameidx, ARCH_CONVERT));
1981
1982 if (unlikely(
1983 ((char *)namest < (char *)leaf) ||
1984 ((char *)namest >= (char *)leaf + XFS_LBSIZE(mp)))) {
1985 XFS_CORRUPTION_ERROR("xfs_dir_leaf_getdents_int(1)",
1986 XFS_ERRLEVEL_LOW, mp, leaf);
1987 xfs_dir_trace_g_du("leaf: corrupted", dp, uio);
1988 return XFS_ERROR(EFSCORRUPTED);
1989 }
1990 if (INT_GET(entry->hashval, ARCH_CONVERT) >= cookhash) {
1991 if ( entno < want_entno
1992 && INT_GET(entry->hashval, ARCH_CONVERT)
1993 == cookhash) {
1994 /*
1995 * Trying to get to a particular offset in a
1996 * run of equal-hashval entries.
1997 */
1998 entno++;
1999 } else if ( want_entno > 0
2000 && entno == want_entno
2001 && INT_GET(entry->hashval, ARCH_CONVERT)
2002 == cookhash) {
2003 break;
2004 } else {
2005 entno = 0;
2006 break;
2007 }
2008 }
2009 }
2010
2011 if (i == INT_GET(leaf->hdr.count, ARCH_CONVERT)) {
2012 xfs_dir_trace_g_du("leaf: hash not found", dp, uio);
2013 if (!INT_GET(leaf->hdr.info.forw, ARCH_CONVERT))
2014 uio->uio_offset =
2015 XFS_DA_MAKE_COOKIE(mp, 0, 0, XFS_DA_MAXHASH);
2016 /*
2017 * Don't set uio_offset if there's another block:
2018 * the node code will be setting uio_offset anyway.
2019 */
2020 *eobp = 0;
2021 return(0);
2022 }
2023 xfs_dir_trace_g_due("leaf: hash found", dp, uio, entry);
2024
2025 p.dbp = dbp;
2026 p.put = put;
2027 p.uio = uio;
2028
2029 /*
2030 * We're synchronized, start copying entries out to the user.
2031 */
2032 for (; entno >= 0 && i < INT_GET(leaf->hdr.count, ARCH_CONVERT);
2033 entry++, i++, (entno = nextentno)) {
2034 int lastresid=0, retval;
2035 xfs_dircook_t lastoffset;
2036 xfs_dahash_t thishash;
2037
2038 /*
2039 * Check for a damaged directory leaf block and pick up
2040 * the inode number from this entry.
2041 */
2042 namest = XFS_DIR_LEAF_NAMESTRUCT(leaf,
2043 INT_GET(entry->nameidx, ARCH_CONVERT));
2044
2045 if (unlikely(
2046 ((char *)namest < (char *)leaf) ||
2047 ((char *)namest >= (char *)leaf + XFS_LBSIZE(mp)))) {
2048 XFS_CORRUPTION_ERROR("xfs_dir_leaf_getdents_int(2)",
2049 XFS_ERRLEVEL_LOW, mp, leaf);
2050 xfs_dir_trace_g_du("leaf: corrupted", dp, uio);
2051 return XFS_ERROR(EFSCORRUPTED);
2052 }
2053
2054 xfs_dir_trace_g_duc("leaf: middle cookie ",
2055 dp, uio, p.cook.o);
2056
2057 if (i < (INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1)) {
2058 nexthash = INT_GET(entry[1].hashval, ARCH_CONVERT);
2059
2060 if (nexthash == INT_GET(entry->hashval, ARCH_CONVERT))
2061 nextentno = entno + 1;
2062 else
2063 nextentno = 0;
2064 XFS_PUT_COOKIE(p.cook, mp, bno, nextentno, nexthash);
2065 xfs_dir_trace_g_duc("leaf: middle cookie ",
2066 dp, uio, p.cook.o);
2067
2068 } else if ((thishash = INT_GET(leaf->hdr.info.forw,
2069 ARCH_CONVERT))) {
2070 xfs_dabuf_t *bp2;
2071 xfs_dir_leafblock_t *leaf2;
2072
2073 ASSERT(nextda != -1);
2074
2075 retval = xfs_da_read_buf(dp->i_transp, dp, thishash,
2076 nextda, &bp2, XFS_DATA_FORK);
2077 if (retval)
2078 return(retval);
2079
2080 ASSERT(bp2 != NULL);
2081
2082 leaf2 = bp2->data;
2083
2084 if (unlikely(
2085 (INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
2086 != XFS_DIR_LEAF_MAGIC)
2087 || (INT_GET(leaf2->hdr.info.back, ARCH_CONVERT)
2088 != bno))) { /* GROT */
2089 XFS_CORRUPTION_ERROR("xfs_dir_leaf_getdents_int(3)",
2090 XFS_ERRLEVEL_LOW, mp,
2091 leaf2);
2092 xfs_da_brelse(dp->i_transp, bp2);
2093
2094 return(XFS_ERROR(EFSCORRUPTED));
2095 }
2096
2097 nexthash = INT_GET(leaf2->entries[0].hashval,
2098 ARCH_CONVERT);
2099 nextentno = -1;
2100 XFS_PUT_COOKIE(p.cook, mp, thishash, 0, nexthash);
2101 xfs_da_brelse(dp->i_transp, bp2);
2102 xfs_dir_trace_g_duc("leaf: next blk cookie",
2103 dp, uio, p.cook.o);
2104 } else {
2105 nextentno = -1;
2106 XFS_PUT_COOKIE(p.cook, mp, 0, 0, XFS_DA_MAXHASH);
2107 }
2108
2109 /*
2110 * Save off the cookie so we can fall back should the
2111 * 'put' into the outgoing buffer fails. To handle a run
2112 * of equal-hashvals, the off_t structure on 64bit
2113 * builds has entno built into the cookie to ID the
2114 * entry. On 32bit builds, we only have space for the
2115 * hashval so we can't ID specific entries within a group
2116 * of same hashval entries. For this, lastoffset is set
2117 * to the first in the run of equal hashvals so we don't
2118 * include any entries unless we can include all entries
2119 * that share the same hashval. Hopefully the buffer
2120 * provided is big enough to handle it (see pv763517).
2121 */
2122#if (BITS_PER_LONG == 32)
2123 if ((thishash = INT_GET(entry->hashval, ARCH_CONVERT))
2124 != lasthash) {
2125 XFS_PUT_COOKIE(lastoffset, mp, bno, entno, thishash);
2126 lastresid = uio->uio_resid;
2127 lasthash = thishash;
2128 } else {
2129 xfs_dir_trace_g_duc("leaf: DUP COOKIES, skipped",
2130 dp, uio, p.cook.o);
2131 }
2132#else
2133 thishash = INT_GET(entry->hashval, ARCH_CONVERT);
2134 XFS_PUT_COOKIE(lastoffset, mp, bno, entno, thishash);
2135 lastresid = uio->uio_resid;
2136#endif /* BITS_PER_LONG == 32 */
2137
2138 /*
2139 * Put the current entry into the outgoing buffer. If we fail
2140 * then restore the UIO to the first entry in the current
2141 * run of equal-hashval entries (probably one 1 entry long).
2142 */
2143 p.ino = XFS_GET_DIR_INO8(namest->inumber);
2144#if XFS_BIG_INUMS
2145 p.ino += mp->m_inoadd;
2146#endif
2147 p.name = (char *)namest->name;
2148 p.namelen = entry->namelen;
2149
2150 retval = p.put(&p);
2151
2152 if (!p.done) {
2153 uio->uio_offset = lastoffset.o;
2154 uio->uio_resid = lastresid;
2155
2156 *eobp = 1;
2157
2158 xfs_dir_trace_g_du("leaf: E-O-B", dp, uio);
2159
2160 return(retval);
2161 }
2162 }
2163
2164 uio->uio_offset = p.cook.o;
2165
2166 *eobp = 0;
2167
2168 xfs_dir_trace_g_du("leaf: E-O-F", dp, uio);
2169
2170 return(0);
2171}
2172
2173/*
2174 * Format a dirent64 structure and copy it out the the user's buffer.
2175 */
2176int
2177xfs_dir_put_dirent64_direct(xfs_dir_put_args_t *pa)
2178{
2179 iovec_t *iovp;
2180 int reclen, namelen;
2181 xfs_dirent_t *idbp;
2182 uio_t *uio;
2183
2184 namelen = pa->namelen;
2185 reclen = DIRENTSIZE(namelen);
2186 uio = pa->uio;
2187 if (reclen > uio->uio_resid) {
2188 pa->done = 0;
2189 return 0;
2190 }
2191 iovp = uio->uio_iov;
2192 idbp = (xfs_dirent_t *)iovp->iov_base;
2193 iovp->iov_base = (char *)idbp + reclen;
2194 iovp->iov_len -= reclen;
2195 uio->uio_resid -= reclen;
2196 idbp->d_reclen = reclen;
2197 idbp->d_ino = pa->ino;
2198 idbp->d_off = pa->cook.o;
2199 idbp->d_name[namelen] = '\0';
2200 pa->done = 1;
2201 memcpy(idbp->d_name, pa->name, namelen);
2202 return 0;
2203}
2204
2205/*
2206 * Format a dirent64 structure and copy it out the the user's buffer.
2207 */
2208int
2209xfs_dir_put_dirent64_uio(xfs_dir_put_args_t *pa)
2210{
2211 int retval, reclen, namelen;
2212 xfs_dirent_t *idbp;
2213 uio_t *uio;
2214
2215 namelen = pa->namelen;
2216 reclen = DIRENTSIZE(namelen);
2217 uio = pa->uio;
2218 if (reclen > uio->uio_resid) {
2219 pa->done = 0;
2220 return 0;
2221 }
2222 idbp = pa->dbp;
2223 idbp->d_reclen = reclen;
2224 idbp->d_ino = pa->ino;
2225 idbp->d_off = pa->cook.o;
2226 idbp->d_name[namelen] = '\0';
2227 memcpy(idbp->d_name, pa->name, namelen);
2228 retval = uio_read((caddr_t)idbp, reclen, uio);
2229 pa->done = (retval == 0);
2230 return retval;
2231}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-29 07:12:50 -0500