aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_mount.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_mount.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_mount.c')
-rw-r--r--fs/xfs/xfs_mount.c1586
1 files changed, 1586 insertions, 0 deletions
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
new file mode 100644
index 000000000000..b57423caef9b
--- /dev/null
+++ b/fs/xfs/xfs_mount.c
@@ -0,0 +1,1586 @@
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#include "xfs_macros.h"
35#include "xfs_types.h"
36#include "xfs_inum.h"
37#include "xfs_log.h"
38#include "xfs_trans.h"
39#include "xfs_sb.h"
40#include "xfs_ag.h"
41#include "xfs_dir.h"
42#include "xfs_dir2.h"
43#include "xfs_dmapi.h"
44#include "xfs_mount.h"
45#include "xfs_alloc_btree.h"
46#include "xfs_bmap_btree.h"
47#include "xfs_ialloc_btree.h"
48#include "xfs_btree.h"
49#include "xfs_ialloc.h"
50#include "xfs_attr_sf.h"
51#include "xfs_dir_sf.h"
52#include "xfs_dir2_sf.h"
53#include "xfs_dinode.h"
54#include "xfs_inode.h"
55#include "xfs_alloc.h"
56#include "xfs_rtalloc.h"
57#include "xfs_bmap.h"
58#include "xfs_error.h"
59#include "xfs_bit.h"
60#include "xfs_rw.h"
61#include "xfs_quota.h"
62#include "xfs_fsops.h"
63
64STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t);
65STATIC int xfs_uuid_mount(xfs_mount_t *);
66STATIC void xfs_uuid_unmount(xfs_mount_t *mp);
67
68static struct {
69 short offset;
70 short type; /* 0 = integer
71 * 1 = binary / string (no translation)
72 */
73} xfs_sb_info[] = {
74 { offsetof(xfs_sb_t, sb_magicnum), 0 },
75 { offsetof(xfs_sb_t, sb_blocksize), 0 },
76 { offsetof(xfs_sb_t, sb_dblocks), 0 },
77 { offsetof(xfs_sb_t, sb_rblocks), 0 },
78 { offsetof(xfs_sb_t, sb_rextents), 0 },
79 { offsetof(xfs_sb_t, sb_uuid), 1 },
80 { offsetof(xfs_sb_t, sb_logstart), 0 },
81 { offsetof(xfs_sb_t, sb_rootino), 0 },
82 { offsetof(xfs_sb_t, sb_rbmino), 0 },
83 { offsetof(xfs_sb_t, sb_rsumino), 0 },
84 { offsetof(xfs_sb_t, sb_rextsize), 0 },
85 { offsetof(xfs_sb_t, sb_agblocks), 0 },
86 { offsetof(xfs_sb_t, sb_agcount), 0 },
87 { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
88 { offsetof(xfs_sb_t, sb_logblocks), 0 },
89 { offsetof(xfs_sb_t, sb_versionnum), 0 },
90 { offsetof(xfs_sb_t, sb_sectsize), 0 },
91 { offsetof(xfs_sb_t, sb_inodesize), 0 },
92 { offsetof(xfs_sb_t, sb_inopblock), 0 },
93 { offsetof(xfs_sb_t, sb_fname[0]), 1 },
94 { offsetof(xfs_sb_t, sb_blocklog), 0 },
95 { offsetof(xfs_sb_t, sb_sectlog), 0 },
96 { offsetof(xfs_sb_t, sb_inodelog), 0 },
97 { offsetof(xfs_sb_t, sb_inopblog), 0 },
98 { offsetof(xfs_sb_t, sb_agblklog), 0 },
99 { offsetof(xfs_sb_t, sb_rextslog), 0 },
100 { offsetof(xfs_sb_t, sb_inprogress), 0 },
101 { offsetof(xfs_sb_t, sb_imax_pct), 0 },
102 { offsetof(xfs_sb_t, sb_icount), 0 },
103 { offsetof(xfs_sb_t, sb_ifree), 0 },
104 { offsetof(xfs_sb_t, sb_fdblocks), 0 },
105 { offsetof(xfs_sb_t, sb_frextents), 0 },
106 { offsetof(xfs_sb_t, sb_uquotino), 0 },
107 { offsetof(xfs_sb_t, sb_gquotino), 0 },
108 { offsetof(xfs_sb_t, sb_qflags), 0 },
109 { offsetof(xfs_sb_t, sb_flags), 0 },
110 { offsetof(xfs_sb_t, sb_shared_vn), 0 },
111 { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
112 { offsetof(xfs_sb_t, sb_unit), 0 },
113 { offsetof(xfs_sb_t, sb_width), 0 },
114 { offsetof(xfs_sb_t, sb_dirblklog), 0 },
115 { offsetof(xfs_sb_t, sb_logsectlog), 0 },
116 { offsetof(xfs_sb_t, sb_logsectsize),0 },
117 { offsetof(xfs_sb_t, sb_logsunit), 0 },
118 { offsetof(xfs_sb_t, sb_features2), 0 },
119 { sizeof(xfs_sb_t), 0 }
120};
121
122/*
123 * Return a pointer to an initialized xfs_mount structure.
124 */
125xfs_mount_t *
126xfs_mount_init(void)
127{
128 xfs_mount_t *mp;
129
130 mp = kmem_zalloc(sizeof(*mp), KM_SLEEP);
131
132 AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
133 spinlock_init(&mp->m_sb_lock, "xfs_sb");
134 mutex_init(&mp->m_ilock, MUTEX_DEFAULT, "xfs_ilock");
135 initnsema(&mp->m_growlock, 1, "xfs_grow");
136 /*
137 * Initialize the AIL.
138 */
139 xfs_trans_ail_init(mp);
140
141 atomic_set(&mp->m_active_trans, 0);
142
143 return mp;
144}
145
146/*
147 * Free up the resources associated with a mount structure. Assume that
148 * the structure was initially zeroed, so we can tell which fields got
149 * initialized.
150 */
151void
152xfs_mount_free(
153 xfs_mount_t *mp,
154 int remove_bhv)
155{
156 if (mp->m_ihash)
157 xfs_ihash_free(mp);
158 if (mp->m_chash)
159 xfs_chash_free(mp);
160
161 if (mp->m_perag) {
162 int agno;
163
164 for (agno = 0; agno < mp->m_maxagi; agno++)
165 if (mp->m_perag[agno].pagb_list)
166 kmem_free(mp->m_perag[agno].pagb_list,
167 sizeof(xfs_perag_busy_t) *
168 XFS_PAGB_NUM_SLOTS);
169 kmem_free(mp->m_perag,
170 sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
171 }
172
173 AIL_LOCK_DESTROY(&mp->m_ail_lock);
174 spinlock_destroy(&mp->m_sb_lock);
175 mutex_destroy(&mp->m_ilock);
176 freesema(&mp->m_growlock);
177 if (mp->m_quotainfo)
178 XFS_QM_DONE(mp);
179
180 if (mp->m_fsname != NULL)
181 kmem_free(mp->m_fsname, mp->m_fsname_len);
182
183 if (remove_bhv) {
184 struct vfs *vfsp = XFS_MTOVFS(mp);
185
186 bhv_remove_all_vfsops(vfsp, 0);
187 VFS_REMOVEBHV(vfsp, &mp->m_bhv);
188 }
189
190 kmem_free(mp, sizeof(xfs_mount_t));
191}
192
193
194/*
195 * Check the validity of the SB found.
196 */
197STATIC int
198xfs_mount_validate_sb(
199 xfs_mount_t *mp,
200 xfs_sb_t *sbp)
201{
202 /*
203 * If the log device and data device have the
204 * same device number, the log is internal.
205 * Consequently, the sb_logstart should be non-zero. If
206 * we have a zero sb_logstart in this case, we may be trying to mount
207 * a volume filesystem in a non-volume manner.
208 */
209 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
210 cmn_err(CE_WARN, "XFS: bad magic number");
211 return XFS_ERROR(EWRONGFS);
212 }
213
214 if (!XFS_SB_GOOD_VERSION(sbp)) {
215 cmn_err(CE_WARN, "XFS: bad version");
216 return XFS_ERROR(EWRONGFS);
217 }
218
219 if (unlikely(
220 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
221 cmn_err(CE_WARN,
222 "XFS: filesystem is marked as having an external log; "
223 "specify logdev on the\nmount command line.");
224 XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(1)",
225 XFS_ERRLEVEL_HIGH, mp, sbp);
226 return XFS_ERROR(EFSCORRUPTED);
227 }
228
229 if (unlikely(
230 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
231 cmn_err(CE_WARN,
232 "XFS: filesystem is marked as having an internal log; "
233 "don't specify logdev on\nthe mount command line.");
234 XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(2)",
235 XFS_ERRLEVEL_HIGH, mp, sbp);
236 return XFS_ERROR(EFSCORRUPTED);
237 }
238
239 /*
240 * More sanity checking. These were stolen directly from
241 * xfs_repair.
242 */
243 if (unlikely(
244 sbp->sb_agcount <= 0 ||
245 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
246 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
247 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
248 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
249 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
250 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
251 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
252 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
253 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
254 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
255 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
256 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
257 sbp->sb_imax_pct > 100)) {
258 cmn_err(CE_WARN, "XFS: SB sanity check 1 failed");
259 XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(3)",
260 XFS_ERRLEVEL_LOW, mp, sbp);
261 return XFS_ERROR(EFSCORRUPTED);
262 }
263
264 /*
265 * Sanity check AG count, size fields against data size field
266 */
267 if (unlikely(
268 sbp->sb_dblocks == 0 ||
269 sbp->sb_dblocks >
270 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
271 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
272 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
273 cmn_err(CE_WARN, "XFS: SB sanity check 2 failed");
274 XFS_ERROR_REPORT("xfs_mount_validate_sb(4)",
275 XFS_ERRLEVEL_LOW, mp);
276 return XFS_ERROR(EFSCORRUPTED);
277 }
278
279 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
280 ASSERT(sbp->sb_blocklog >= BBSHIFT);
281
282#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
283 if (unlikely(
284 (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX ||
285 (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) {
286#else /* Limited by UINT_MAX of sectors */
287 if (unlikely(
288 (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX ||
289 (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) {
290#endif
291 cmn_err(CE_WARN,
292 "XFS: File system is too large to be mounted on this system.");
293 return XFS_ERROR(E2BIG);
294 }
295
296 if (unlikely(sbp->sb_inprogress)) {
297 cmn_err(CE_WARN, "XFS: file system busy");
298 XFS_ERROR_REPORT("xfs_mount_validate_sb(5)",
299 XFS_ERRLEVEL_LOW, mp);
300 return XFS_ERROR(EFSCORRUPTED);
301 }
302
303 /*
304 * Until this is fixed only page-sized or smaller data blocks work.
305 */
306 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
307 cmn_err(CE_WARN,
308 "XFS: Attempted to mount file system with blocksize %d bytes",
309 sbp->sb_blocksize);
310 cmn_err(CE_WARN,
311 "XFS: Only page-sized (%d) or less blocksizes currently work.",
312 PAGE_SIZE);
313 return XFS_ERROR(ENOSYS);
314 }
315
316 return 0;
317}
318
319xfs_agnumber_t
320xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount)
321{
322 xfs_agnumber_t index, max_metadata;
323 xfs_perag_t *pag;
324 xfs_agino_t agino;
325 xfs_ino_t ino;
326 xfs_sb_t *sbp = &mp->m_sb;
327 xfs_ino_t max_inum = XFS_MAXINUMBER_32;
328
329 /* Check to see if the filesystem can overflow 32 bit inodes */
330 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
331 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
332
333 /* Clear the mount flag if no inode can overflow 32 bits
334 * on this filesystem, or if specifically requested..
335 */
336 if ((mp->m_flags & XFS_MOUNT_32BITINOOPT) && ino > max_inum) {
337 mp->m_flags |= XFS_MOUNT_32BITINODES;
338 } else {
339 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
340 }
341
342 /* If we can overflow then setup the ag headers accordingly */
343 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
344 /* Calculate how much should be reserved for inodes to
345 * meet the max inode percentage.
346 */
347 if (mp->m_maxicount) {
348 __uint64_t icount;
349
350 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
351 do_div(icount, 100);
352 icount += sbp->sb_agblocks - 1;
353 do_div(icount, mp->m_ialloc_blks);
354 max_metadata = icount;
355 } else {
356 max_metadata = agcount;
357 }
358 for (index = 0; index < agcount; index++) {
359 ino = XFS_AGINO_TO_INO(mp, index, agino);
360 if (ino > max_inum) {
361 index++;
362 break;
363 }
364
365 /* This ag is prefered for inodes */
366 pag = &mp->m_perag[index];
367 pag->pagi_inodeok = 1;
368 if (index < max_metadata)
369 pag->pagf_metadata = 1;
370 }
371 } else {
372 /* Setup default behavior for smaller filesystems */
373 for (index = 0; index < agcount; index++) {
374 pag = &mp->m_perag[index];
375 pag->pagi_inodeok = 1;
376 }
377 }
378 return index;
379}
380
381/*
382 * xfs_xlatesb
383 *
384 * data - on disk version of sb
385 * sb - a superblock
386 * dir - conversion direction: <0 - convert sb to buf
387 * >0 - convert buf to sb
388 * fields - which fields to copy (bitmask)
389 */
390void
391xfs_xlatesb(
392 void *data,
393 xfs_sb_t *sb,
394 int dir,
395 __int64_t fields)
396{
397 xfs_caddr_t buf_ptr;
398 xfs_caddr_t mem_ptr;
399 xfs_sb_field_t f;
400 int first;
401 int size;
402
403 ASSERT(dir);
404 ASSERT(fields);
405
406 if (!fields)
407 return;
408
409 buf_ptr = (xfs_caddr_t)data;
410 mem_ptr = (xfs_caddr_t)sb;
411
412 while (fields) {
413 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
414 first = xfs_sb_info[f].offset;
415 size = xfs_sb_info[f + 1].offset - first;
416
417 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
418
419 if (size == 1 || xfs_sb_info[f].type == 1) {
420 if (dir > 0) {
421 memcpy(mem_ptr + first, buf_ptr + first, size);
422 } else {
423 memcpy(buf_ptr + first, mem_ptr + first, size);
424 }
425 } else {
426 switch (size) {
427 case 2:
428 INT_XLATE(*(__uint16_t*)(buf_ptr+first),
429 *(__uint16_t*)(mem_ptr+first),
430 dir, ARCH_CONVERT);
431 break;
432 case 4:
433 INT_XLATE(*(__uint32_t*)(buf_ptr+first),
434 *(__uint32_t*)(mem_ptr+first),
435 dir, ARCH_CONVERT);
436 break;
437 case 8:
438 INT_XLATE(*(__uint64_t*)(buf_ptr+first),
439 *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
440 break;
441 default:
442 ASSERT(0);
443 }
444 }
445
446 fields &= ~(1LL << f);
447 }
448}
449
450/*
451 * xfs_readsb
452 *
453 * Does the initial read of the superblock.
454 */
455int
456xfs_readsb(xfs_mount_t *mp)
457{
458 unsigned int sector_size;
459 unsigned int extra_flags;
460 xfs_buf_t *bp;
461 xfs_sb_t *sbp;
462 int error;
463
464 ASSERT(mp->m_sb_bp == NULL);
465 ASSERT(mp->m_ddev_targp != NULL);
466
467 /*
468 * Allocate a (locked) buffer to hold the superblock.
469 * This will be kept around at all times to optimize
470 * access to the superblock.
471 */
472 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
473 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
474
475 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
476 BTOBB(sector_size), extra_flags);
477 if (!bp || XFS_BUF_ISERROR(bp)) {
478 cmn_err(CE_WARN, "XFS: SB read failed");
479 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
480 goto fail;
481 }
482 ASSERT(XFS_BUF_ISBUSY(bp));
483 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
484
485 /*
486 * Initialize the mount structure from the superblock.
487 * But first do some basic consistency checking.
488 */
489 sbp = XFS_BUF_TO_SBP(bp);
490 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS);
491
492 error = xfs_mount_validate_sb(mp, &(mp->m_sb));
493 if (error) {
494 cmn_err(CE_WARN, "XFS: SB validate failed");
495 goto fail;
496 }
497
498 /*
499 * We must be able to do sector-sized and sector-aligned IO.
500 */
501 if (sector_size > mp->m_sb.sb_sectsize) {
502 cmn_err(CE_WARN,
503 "XFS: device supports only %u byte sectors (not %u)",
504 sector_size, mp->m_sb.sb_sectsize);
505 error = ENOSYS;
506 goto fail;
507 }
508
509 /*
510 * If device sector size is smaller than the superblock size,
511 * re-read the superblock so the buffer is correctly sized.
512 */
513 if (sector_size < mp->m_sb.sb_sectsize) {
514 XFS_BUF_UNMANAGE(bp);
515 xfs_buf_relse(bp);
516 sector_size = mp->m_sb.sb_sectsize;
517 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
518 BTOBB(sector_size), extra_flags);
519 if (!bp || XFS_BUF_ISERROR(bp)) {
520 cmn_err(CE_WARN, "XFS: SB re-read failed");
521 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
522 goto fail;
523 }
524 ASSERT(XFS_BUF_ISBUSY(bp));
525 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
526 }
527
528 mp->m_sb_bp = bp;
529 xfs_buf_relse(bp);
530 ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
531 return 0;
532
533 fail:
534 if (bp) {
535 XFS_BUF_UNMANAGE(bp);
536 xfs_buf_relse(bp);
537 }
538 return error;
539}
540
541
542/*
543 * xfs_mount_common
544 *
545 * Mount initialization code establishing various mount
546 * fields from the superblock associated with the given
547 * mount structure
548 */
549void
550xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
551{
552 int i;
553
554 mp->m_agfrotor = mp->m_agirotor = 0;
555 spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock");
556 mp->m_maxagi = mp->m_sb.sb_agcount;
557 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
558 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
559 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
560 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
561 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
562 mp->m_litino = sbp->sb_inodesize -
563 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
564 mp->m_blockmask = sbp->sb_blocksize - 1;
565 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
566 mp->m_blockwmask = mp->m_blockwsize - 1;
567 INIT_LIST_HEAD(&mp->m_del_inodes);
568
569 /*
570 * Setup for attributes, in case they get created.
571 * This value is for inodes getting attributes for the first time,
572 * the per-inode value is for old attribute values.
573 */
574 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
575 switch (sbp->sb_inodesize) {
576 case 256:
577 mp->m_attroffset = XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(2);
578 break;
579 case 512:
580 case 1024:
581 case 2048:
582 mp->m_attroffset = XFS_BMDR_SPACE_CALC(12);
583 break;
584 default:
585 ASSERT(0);
586 }
587 ASSERT(mp->m_attroffset < XFS_LITINO(mp));
588
589 for (i = 0; i < 2; i++) {
590 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
591 xfs_alloc, i == 0);
592 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
593 xfs_alloc, i == 0);
594 }
595 for (i = 0; i < 2; i++) {
596 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
597 xfs_bmbt, i == 0);
598 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
599 xfs_bmbt, i == 0);
600 }
601 for (i = 0; i < 2; i++) {
602 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
603 xfs_inobt, i == 0);
604 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
605 xfs_inobt, i == 0);
606 }
607
608 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
609 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
610 sbp->sb_inopblock);
611 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
612}
613/*
614 * xfs_mountfs
615 *
616 * This function does the following on an initial mount of a file system:
617 * - reads the superblock from disk and init the mount struct
618 * - if we're a 32-bit kernel, do a size check on the superblock
619 * so we don't mount terabyte filesystems
620 * - init mount struct realtime fields
621 * - allocate inode hash table for fs
622 * - init directory manager
623 * - perform recovery and init the log manager
624 */
625int
626xfs_mountfs(
627 vfs_t *vfsp,
628 xfs_mount_t *mp,
629 int mfsi_flags)
630{
631 xfs_buf_t *bp;
632 xfs_sb_t *sbp = &(mp->m_sb);
633 xfs_inode_t *rip;
634 vnode_t *rvp = NULL;
635 int readio_log, writeio_log;
636 xfs_daddr_t d;
637 __uint64_t ret64;
638 __int64_t update_flags;
639 uint quotamount, quotaflags;
640 int agno;
641 int uuid_mounted = 0;
642 int error = 0;
643
644 if (mp->m_sb_bp == NULL) {
645 if ((error = xfs_readsb(mp))) {
646 return (error);
647 }
648 }
649 xfs_mount_common(mp, sbp);
650
651 /*
652 * Check if sb_agblocks is aligned at stripe boundary
653 * If sb_agblocks is NOT aligned turn off m_dalign since
654 * allocator alignment is within an ag, therefore ag has
655 * to be aligned at stripe boundary.
656 */
657 update_flags = 0LL;
658 if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
659 /*
660 * If stripe unit and stripe width are not multiples
661 * of the fs blocksize turn off alignment.
662 */
663 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
664 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
665 if (mp->m_flags & XFS_MOUNT_RETERR) {
666 cmn_err(CE_WARN,
667 "XFS: alignment check 1 failed");
668 error = XFS_ERROR(EINVAL);
669 goto error1;
670 }
671 mp->m_dalign = mp->m_swidth = 0;
672 } else {
673 /*
674 * Convert the stripe unit and width to FSBs.
675 */
676 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
677 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
678 if (mp->m_flags & XFS_MOUNT_RETERR) {
679 error = XFS_ERROR(EINVAL);
680 goto error1;
681 }
682 xfs_fs_cmn_err(CE_WARN, mp,
683"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
684 mp->m_dalign, mp->m_swidth,
685 sbp->sb_agblocks);
686
687 mp->m_dalign = 0;
688 mp->m_swidth = 0;
689 } else if (mp->m_dalign) {
690 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
691 } else {
692 if (mp->m_flags & XFS_MOUNT_RETERR) {
693 xfs_fs_cmn_err(CE_WARN, mp,
694"stripe alignment turned off: sunit(%d) less than bsize(%d)",
695 mp->m_dalign,
696 mp->m_blockmask +1);
697 error = XFS_ERROR(EINVAL);
698 goto error1;
699 }
700 mp->m_swidth = 0;
701 }
702 }
703
704 /*
705 * Update superblock with new values
706 * and log changes
707 */
708 if (XFS_SB_VERSION_HASDALIGN(sbp)) {
709 if (sbp->sb_unit != mp->m_dalign) {
710 sbp->sb_unit = mp->m_dalign;
711 update_flags |= XFS_SB_UNIT;
712 }
713 if (sbp->sb_width != mp->m_swidth) {
714 sbp->sb_width = mp->m_swidth;
715 update_flags |= XFS_SB_WIDTH;
716 }
717 }
718 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
719 XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
720 mp->m_dalign = sbp->sb_unit;
721 mp->m_swidth = sbp->sb_width;
722 }
723
724 xfs_alloc_compute_maxlevels(mp);
725 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
726 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
727 xfs_ialloc_compute_maxlevels(mp);
728
729 if (sbp->sb_imax_pct) {
730 __uint64_t icount;
731
732 /* Make sure the maximum inode count is a multiple of the
733 * units we allocate inodes in.
734 */
735
736 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
737 do_div(icount, 100);
738 do_div(icount, mp->m_ialloc_blks);
739 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
740 sbp->sb_inopblog;
741 } else
742 mp->m_maxicount = 0;
743
744 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
745
746 /*
747 * XFS uses the uuid from the superblock as the unique
748 * identifier for fsid. We can not use the uuid from the volume
749 * since a single partition filesystem is identical to a single
750 * partition volume/filesystem.
751 */
752 if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&
753 (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
754 if (xfs_uuid_mount(mp)) {
755 error = XFS_ERROR(EINVAL);
756 goto error1;
757 }
758 uuid_mounted=1;
759 ret64 = uuid_hash64(&sbp->sb_uuid);
760 memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64));
761 }
762
763 /*
764 * Set the default minimum read and write sizes unless
765 * already specified in a mount option.
766 * We use smaller I/O sizes when the file system
767 * is being used for NFS service (wsync mount option).
768 */
769 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
770 if (mp->m_flags & XFS_MOUNT_WSYNC) {
771 readio_log = XFS_WSYNC_READIO_LOG;
772 writeio_log = XFS_WSYNC_WRITEIO_LOG;
773 } else {
774 readio_log = XFS_READIO_LOG_LARGE;
775 writeio_log = XFS_WRITEIO_LOG_LARGE;
776 }
777 } else {
778 readio_log = mp->m_readio_log;
779 writeio_log = mp->m_writeio_log;
780 }
781
782 /*
783 * Set the number of readahead buffers to use based on
784 * physical memory size.
785 */
786 if (xfs_physmem <= 4096) /* <= 16MB */
787 mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
788 else if (xfs_physmem <= 8192) /* <= 32MB */
789 mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
790 else
791 mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
792 if (sbp->sb_blocklog > readio_log) {
793 mp->m_readio_log = sbp->sb_blocklog;
794 } else {
795 mp->m_readio_log = readio_log;
796 }
797 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
798 if (sbp->sb_blocklog > writeio_log) {
799 mp->m_writeio_log = sbp->sb_blocklog;
800 } else {
801 mp->m_writeio_log = writeio_log;
802 }
803 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
804
805 /*
806 * Set the inode cluster size based on the physical memory
807 * size. This may still be overridden by the file system
808 * block size if it is larger than the chosen cluster size.
809 */
810 if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
811 mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE;
812 } else {
813 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
814 }
815 /*
816 * Set whether we're using inode alignment.
817 */
818 if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
819 mp->m_sb.sb_inoalignmt >=
820 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
821 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
822 else
823 mp->m_inoalign_mask = 0;
824 /*
825 * If we are using stripe alignment, check whether
826 * the stripe unit is a multiple of the inode alignment
827 */
828 if (mp->m_dalign && mp->m_inoalign_mask &&
829 !(mp->m_dalign & mp->m_inoalign_mask))
830 mp->m_sinoalign = mp->m_dalign;
831 else
832 mp->m_sinoalign = 0;
833 /*
834 * Check that the data (and log if separate) are an ok size.
835 */
836 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
837 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
838 cmn_err(CE_WARN, "XFS: size check 1 failed");
839 error = XFS_ERROR(E2BIG);
840 goto error1;
841 }
842 error = xfs_read_buf(mp, mp->m_ddev_targp,
843 d - XFS_FSS_TO_BB(mp, 1),
844 XFS_FSS_TO_BB(mp, 1), 0, &bp);
845 if (!error) {
846 xfs_buf_relse(bp);
847 } else {
848 cmn_err(CE_WARN, "XFS: size check 2 failed");
849 if (error == ENOSPC) {
850 error = XFS_ERROR(E2BIG);
851 }
852 goto error1;
853 }
854
855 if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
856 mp->m_logdev_targp != mp->m_ddev_targp) {
857 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
858 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
859 cmn_err(CE_WARN, "XFS: size check 3 failed");
860 error = XFS_ERROR(E2BIG);
861 goto error1;
862 }
863 error = xfs_read_buf(mp, mp->m_logdev_targp,
864 d - XFS_FSB_TO_BB(mp, 1),
865 XFS_FSB_TO_BB(mp, 1), 0, &bp);
866 if (!error) {
867 xfs_buf_relse(bp);
868 } else {
869 cmn_err(CE_WARN, "XFS: size check 3 failed");
870 if (error == ENOSPC) {
871 error = XFS_ERROR(E2BIG);
872 }
873 goto error1;
874 }
875 }
876
877 /*
878 * Initialize realtime fields in the mount structure
879 */
880 if ((error = xfs_rtmount_init(mp))) {
881 cmn_err(CE_WARN, "XFS: RT mount failed");
882 goto error1;
883 }
884
885 /*
886 * For client case we are done now
887 */
888 if (mfsi_flags & XFS_MFSI_CLIENT) {
889 return(0);
890 }
891
892 /*
893 * Copies the low order bits of the timestamp and the randomly
894 * set "sequence" number out of a UUID.
895 */
896 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
897
898 /*
899 * The vfs structure needs to have a file system independent
900 * way of checking for the invariant file system ID. Since it
901 * can't look at mount structures it has a pointer to the data
902 * in the mount structure.
903 *
904 * File systems that don't support user level file handles (i.e.
905 * all of them except for XFS) will leave vfs_altfsid as NULL.
906 */
907 vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid;
908 mp->m_dmevmask = 0; /* not persistent; set after each mount */
909
910 /*
911 * Select the right directory manager.
912 */
913 mp->m_dirops =
914 XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
915 xfsv2_dirops :
916 xfsv1_dirops;
917
918 /*
919 * Initialize directory manager's entries.
920 */
921 XFS_DIR_MOUNT(mp);
922
923 /*
924 * Initialize the attribute manager's entries.
925 */
926 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
927
928 /*
929 * Initialize the precomputed transaction reservations values.
930 */
931 xfs_trans_init(mp);
932
933 /*
934 * Allocate and initialize the inode hash table for this
935 * file system.
936 */
937 xfs_ihash_init(mp);
938 xfs_chash_init(mp);
939
940 /*
941 * Allocate and initialize the per-ag data.
942 */
943 init_rwsem(&mp->m_peraglock);
944 mp->m_perag =
945 kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
946
947 mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount);
948
949 /*
950 * log's mount-time initialization. Perform 1st part recovery if needed
951 */
952 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
953 error = xfs_log_mount(mp, mp->m_logdev_targp,
954 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
955 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
956 if (error) {
957 cmn_err(CE_WARN, "XFS: log mount failed");
958 goto error2;
959 }
960 } else { /* No log has been defined */
961 cmn_err(CE_WARN, "XFS: no log defined");
962 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
963 error = XFS_ERROR(EFSCORRUPTED);
964 goto error2;
965 }
966
967 /*
968 * Get and sanity-check the root inode.
969 * Save the pointer to it in the mount structure.
970 */
971 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
972 if (error) {
973 cmn_err(CE_WARN, "XFS: failed to read root inode");
974 goto error3;
975 }
976
977 ASSERT(rip != NULL);
978 rvp = XFS_ITOV(rip);
979
980 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
981 cmn_err(CE_WARN, "XFS: corrupted root inode");
982 prdev("Root inode %llu is not a directory",
983 mp->m_ddev_targp, (unsigned long long)rip->i_ino);
984 xfs_iunlock(rip, XFS_ILOCK_EXCL);
985 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
986 mp);
987 error = XFS_ERROR(EFSCORRUPTED);
988 goto error4;
989 }
990 mp->m_rootip = rip; /* save it */
991
992 xfs_iunlock(rip, XFS_ILOCK_EXCL);
993
994 /*
995 * Initialize realtime inode pointers in the mount structure
996 */
997 if ((error = xfs_rtmount_inodes(mp))) {
998 /*
999 * Free up the root inode.
1000 */
1001 cmn_err(CE_WARN, "XFS: failed to read RT inodes");
1002 goto error4;
1003 }
1004
1005 /*
1006 * If fs is not mounted readonly, then update the superblock
1007 * unit and width changes.
1008 */
1009 if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY))
1010 xfs_mount_log_sbunit(mp, update_flags);
1011
1012 /*
1013 * Initialise the XFS quota management subsystem for this mount
1014 */
1015 if ((error = XFS_QM_INIT(mp, &quotamount, &quotaflags)))
1016 goto error4;
1017
1018 /*
1019 * Finish recovering the file system. This part needed to be
1020 * delayed until after the root and real-time bitmap inodes
1021 * were consistently read in.
1022 */
1023 error = xfs_log_mount_finish(mp, mfsi_flags);
1024 if (error) {
1025 cmn_err(CE_WARN, "XFS: log mount finish failed");
1026 goto error4;
1027 }
1028
1029 /*
1030 * Complete the quota initialisation, post-log-replay component.
1031 */
1032 if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))
1033 goto error4;
1034
1035 return 0;
1036
1037 error4:
1038 /*
1039 * Free up the root inode.
1040 */
1041 VN_RELE(rvp);
1042 error3:
1043 xfs_log_unmount_dealloc(mp);
1044 error2:
1045 xfs_ihash_free(mp);
1046 xfs_chash_free(mp);
1047 for (agno = 0; agno < sbp->sb_agcount; agno++)
1048 if (mp->m_perag[agno].pagb_list)
1049 kmem_free(mp->m_perag[agno].pagb_list,
1050 sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
1051 kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
1052 mp->m_perag = NULL;
1053 /* FALLTHROUGH */
1054 error1:
1055 if (uuid_mounted)
1056 xfs_uuid_unmount(mp);
1057 xfs_freesb(mp);
1058 return error;
1059}
1060
1061/*
1062 * xfs_unmountfs
1063 *
1064 * This flushes out the inodes,dquots and the superblock, unmounts the
1065 * log and makes sure that incore structures are freed.
1066 */
1067int
1068xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
1069{
1070 struct vfs *vfsp = XFS_MTOVFS(mp);
1071#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1072 int64_t fsid;
1073#endif
1074
1075 xfs_iflush_all(mp, XFS_FLUSH_ALL);
1076
1077 XFS_QM_DQPURGEALL(mp,
1078 XFS_QMOPT_UQUOTA | XFS_QMOPT_GQUOTA | XFS_QMOPT_UMOUNTING);
1079
1080 /*
1081 * Flush out the log synchronously so that we know for sure
1082 * that nothing is pinned. This is important because bflush()
1083 * will skip pinned buffers.
1084 */
1085 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
1086
1087 xfs_binval(mp->m_ddev_targp);
1088 if (mp->m_rtdev_targp) {
1089 xfs_binval(mp->m_rtdev_targp);
1090 }
1091
1092 xfs_unmountfs_writesb(mp);
1093
1094 xfs_unmountfs_wait(mp); /* wait for async bufs */
1095
1096 xfs_log_unmount(mp); /* Done! No more fs ops. */
1097
1098 xfs_freesb(mp);
1099
1100 /*
1101 * All inodes from this mount point should be freed.
1102 */
1103 ASSERT(mp->m_inodes == NULL);
1104
1105 /*
1106 * We may have bufs that are in the process of getting written still.
1107 * We must wait for the I/O completion of those. The sync flag here
1108 * does a two pass iteration thru the bufcache.
1109 */
1110 if (XFS_FORCED_SHUTDOWN(mp)) {
1111 xfs_incore_relse(mp->m_ddev_targp, 0, 1); /* synchronous */
1112 }
1113
1114 xfs_unmountfs_close(mp, cr);
1115 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
1116 xfs_uuid_unmount(mp);
1117
1118#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1119 /*
1120 * clear all error tags on this filesystem
1121 */
1122 memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t));
1123 xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
1124#endif
1125 XFS_IODONE(vfsp);
1126 xfs_mount_free(mp, 1);
1127 return 0;
1128}
1129
1130void
1131xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
1132{
1133 if (mp->m_logdev_targp != mp->m_ddev_targp)
1134 xfs_free_buftarg(mp->m_logdev_targp, 1);
1135 if (mp->m_rtdev_targp)
1136 xfs_free_buftarg(mp->m_rtdev_targp, 1);
1137 xfs_free_buftarg(mp->m_ddev_targp, 0);
1138}
1139
1140void
1141xfs_unmountfs_wait(xfs_mount_t *mp)
1142{
1143 if (mp->m_logdev_targp != mp->m_ddev_targp)
1144 xfs_wait_buftarg(mp->m_logdev_targp);
1145 if (mp->m_rtdev_targp)
1146 xfs_wait_buftarg(mp->m_rtdev_targp);
1147 xfs_wait_buftarg(mp->m_ddev_targp);
1148}
1149
1150int
1151xfs_unmountfs_writesb(xfs_mount_t *mp)
1152{
1153 xfs_buf_t *sbp;
1154 xfs_sb_t *sb;
1155 int error = 0;
1156
1157 /*
1158 * skip superblock write if fs is read-only, or
1159 * if we are doing a forced umount.
1160 */
1161 sbp = xfs_getsb(mp, 0);
1162 if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
1163 XFS_FORCED_SHUTDOWN(mp))) {
1164 /*
1165 * mark shared-readonly if desired
1166 */
1167 sb = XFS_BUF_TO_SBP(sbp);
1168 if (mp->m_mk_sharedro) {
1169 if (!(sb->sb_flags & XFS_SBF_READONLY))
1170 sb->sb_flags |= XFS_SBF_READONLY;
1171 if (!XFS_SB_VERSION_HASSHARED(sb))
1172 XFS_SB_VERSION_ADDSHARED(sb);
1173 xfs_fs_cmn_err(CE_NOTE, mp,
1174 "Unmounting, marking shared read-only");
1175 }
1176 XFS_BUF_UNDONE(sbp);
1177 XFS_BUF_UNREAD(sbp);
1178 XFS_BUF_UNDELAYWRITE(sbp);
1179 XFS_BUF_WRITE(sbp);
1180 XFS_BUF_UNASYNC(sbp);
1181 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
1182 xfsbdstrat(mp, sbp);
1183 /* Nevermind errors we might get here. */
1184 error = xfs_iowait(sbp);
1185 if (error)
1186 xfs_ioerror_alert("xfs_unmountfs_writesb",
1187 mp, sbp, XFS_BUF_ADDR(sbp));
1188 if (error && mp->m_mk_sharedro)
1189 xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
1190 }
1191 xfs_buf_relse(sbp);
1192 return (error);
1193}
1194
1195/*
1196 * xfs_mod_sb() can be used to copy arbitrary changes to the
1197 * in-core superblock into the superblock buffer to be logged.
1198 * It does not provide the higher level of locking that is
1199 * needed to protect the in-core superblock from concurrent
1200 * access.
1201 */
1202void
1203xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
1204{
1205 xfs_buf_t *bp;
1206 int first;
1207 int last;
1208 xfs_mount_t *mp;
1209 xfs_sb_t *sbp;
1210 xfs_sb_field_t f;
1211
1212 ASSERT(fields);
1213 if (!fields)
1214 return;
1215 mp = tp->t_mountp;
1216 bp = xfs_trans_getsb(tp, mp, 0);
1217 sbp = XFS_BUF_TO_SBP(bp);
1218 first = sizeof(xfs_sb_t);
1219 last = 0;
1220
1221 /* translate/copy */
1222
1223 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields);
1224
1225 /* find modified range */
1226
1227 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
1228 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1229 first = xfs_sb_info[f].offset;
1230
1231 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
1232 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1233 last = xfs_sb_info[f + 1].offset - 1;
1234
1235 xfs_trans_log_buf(tp, bp, first, last);
1236}
1237
1238/*
1239 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1240 * a delta to a specified field in the in-core superblock. Simply
1241 * switch on the field indicated and apply the delta to that field.
1242 * Fields are not allowed to dip below zero, so if the delta would
1243 * do this do not apply it and return EINVAL.
1244 *
1245 * The SB_LOCK must be held when this routine is called.
1246 */
1247STATIC int
1248xfs_mod_incore_sb_unlocked(xfs_mount_t *mp, xfs_sb_field_t field,
1249 int delta, int rsvd)
1250{
1251 int scounter; /* short counter for 32 bit fields */
1252 long long lcounter; /* long counter for 64 bit fields */
1253 long long res_used, rem;
1254
1255 /*
1256 * With the in-core superblock spin lock held, switch
1257 * on the indicated field. Apply the delta to the
1258 * proper field. If the fields value would dip below
1259 * 0, then do not apply the delta and return EINVAL.
1260 */
1261 switch (field) {
1262 case XFS_SBS_ICOUNT:
1263 lcounter = (long long)mp->m_sb.sb_icount;
1264 lcounter += delta;
1265 if (lcounter < 0) {
1266 ASSERT(0);
1267 return (XFS_ERROR(EINVAL));
1268 }
1269 mp->m_sb.sb_icount = lcounter;
1270 return (0);
1271 case XFS_SBS_IFREE:
1272 lcounter = (long long)mp->m_sb.sb_ifree;
1273 lcounter += delta;
1274 if (lcounter < 0) {
1275 ASSERT(0);
1276 return (XFS_ERROR(EINVAL));
1277 }
1278 mp->m_sb.sb_ifree = lcounter;
1279 return (0);
1280 case XFS_SBS_FDBLOCKS:
1281
1282 lcounter = (long long)mp->m_sb.sb_fdblocks;
1283 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1284
1285 if (delta > 0) { /* Putting blocks back */
1286 if (res_used > delta) {
1287 mp->m_resblks_avail += delta;
1288 } else {
1289 rem = delta - res_used;
1290 mp->m_resblks_avail = mp->m_resblks;
1291 lcounter += rem;
1292 }
1293 } else { /* Taking blocks away */
1294
1295 lcounter += delta;
1296
1297 /*
1298 * If were out of blocks, use any available reserved blocks if
1299 * were allowed to.
1300 */
1301
1302 if (lcounter < 0) {
1303 if (rsvd) {
1304 lcounter = (long long)mp->m_resblks_avail + delta;
1305 if (lcounter < 0) {
1306 return (XFS_ERROR(ENOSPC));
1307 }
1308 mp->m_resblks_avail = lcounter;
1309 return (0);
1310 } else { /* not reserved */
1311 return (XFS_ERROR(ENOSPC));
1312 }
1313 }
1314 }
1315
1316 mp->m_sb.sb_fdblocks = lcounter;
1317 return (0);
1318 case XFS_SBS_FREXTENTS:
1319 lcounter = (long long)mp->m_sb.sb_frextents;
1320 lcounter += delta;
1321 if (lcounter < 0) {
1322 return (XFS_ERROR(ENOSPC));
1323 }
1324 mp->m_sb.sb_frextents = lcounter;
1325 return (0);
1326 case XFS_SBS_DBLOCKS:
1327 lcounter = (long long)mp->m_sb.sb_dblocks;
1328 lcounter += delta;
1329 if (lcounter < 0) {
1330 ASSERT(0);
1331 return (XFS_ERROR(EINVAL));
1332 }
1333 mp->m_sb.sb_dblocks = lcounter;
1334 return (0);
1335 case XFS_SBS_AGCOUNT:
1336 scounter = mp->m_sb.sb_agcount;
1337 scounter += delta;
1338 if (scounter < 0) {
1339 ASSERT(0);
1340 return (XFS_ERROR(EINVAL));
1341 }
1342 mp->m_sb.sb_agcount = scounter;
1343 return (0);
1344 case XFS_SBS_IMAX_PCT:
1345 scounter = mp->m_sb.sb_imax_pct;
1346 scounter += delta;
1347 if (scounter < 0) {
1348 ASSERT(0);
1349 return (XFS_ERROR(EINVAL));
1350 }
1351 mp->m_sb.sb_imax_pct = scounter;
1352 return (0);
1353 case XFS_SBS_REXTSIZE:
1354 scounter = mp->m_sb.sb_rextsize;
1355 scounter += delta;
1356 if (scounter < 0) {
1357 ASSERT(0);
1358 return (XFS_ERROR(EINVAL));
1359 }
1360 mp->m_sb.sb_rextsize = scounter;
1361 return (0);
1362 case XFS_SBS_RBMBLOCKS:
1363 scounter = mp->m_sb.sb_rbmblocks;
1364 scounter += delta;
1365 if (scounter < 0) {
1366 ASSERT(0);
1367 return (XFS_ERROR(EINVAL));
1368 }
1369 mp->m_sb.sb_rbmblocks = scounter;
1370 return (0);
1371 case XFS_SBS_RBLOCKS:
1372 lcounter = (long long)mp->m_sb.sb_rblocks;
1373 lcounter += delta;
1374 if (lcounter < 0) {
1375 ASSERT(0);
1376 return (XFS_ERROR(EINVAL));
1377 }
1378 mp->m_sb.sb_rblocks = lcounter;
1379 return (0);
1380 case XFS_SBS_REXTENTS:
1381 lcounter = (long long)mp->m_sb.sb_rextents;
1382 lcounter += delta;
1383 if (lcounter < 0) {
1384 ASSERT(0);
1385 return (XFS_ERROR(EINVAL));
1386 }
1387 mp->m_sb.sb_rextents = lcounter;
1388 return (0);
1389 case XFS_SBS_REXTSLOG:
1390 scounter = mp->m_sb.sb_rextslog;
1391 scounter += delta;
1392 if (scounter < 0) {
1393 ASSERT(0);
1394 return (XFS_ERROR(EINVAL));
1395 }
1396 mp->m_sb.sb_rextslog = scounter;
1397 return (0);
1398 default:
1399 ASSERT(0);
1400 return (XFS_ERROR(EINVAL));
1401 }
1402}
1403
1404/*
1405 * xfs_mod_incore_sb() is used to change a field in the in-core
1406 * superblock structure by the specified delta. This modification
1407 * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
1408 * routine to do the work.
1409 */
1410int
1411xfs_mod_incore_sb(xfs_mount_t *mp, xfs_sb_field_t field, int delta, int rsvd)
1412{
1413 unsigned long s;
1414 int status;
1415
1416 s = XFS_SB_LOCK(mp);
1417 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
1418 XFS_SB_UNLOCK(mp, s);
1419 return (status);
1420}
1421
1422/*
1423 * xfs_mod_incore_sb_batch() is used to change more than one field
1424 * in the in-core superblock structure at a time. This modification
1425 * is protected by a lock internal to this module. The fields and
1426 * changes to those fields are specified in the array of xfs_mod_sb
1427 * structures passed in.
1428 *
1429 * Either all of the specified deltas will be applied or none of
1430 * them will. If any modified field dips below 0, then all modifications
1431 * will be backed out and EINVAL will be returned.
1432 */
1433int
1434xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
1435{
1436 unsigned long s;
1437 int status=0;
1438 xfs_mod_sb_t *msbp;
1439
1440 /*
1441 * Loop through the array of mod structures and apply each
1442 * individually. If any fail, then back out all those
1443 * which have already been applied. Do all of this within
1444 * the scope of the SB_LOCK so that all of the changes will
1445 * be atomic.
1446 */
1447 s = XFS_SB_LOCK(mp);
1448 msbp = &msb[0];
1449 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
1450 /*
1451 * Apply the delta at index n. If it fails, break
1452 * from the loop so we'll fall into the undo loop
1453 * below.
1454 */
1455 status = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field,
1456 msbp->msb_delta, rsvd);
1457 if (status != 0) {
1458 break;
1459 }
1460 }
1461
1462 /*
1463 * If we didn't complete the loop above, then back out
1464 * any changes made to the superblock. If you add code
1465 * between the loop above and here, make sure that you
1466 * preserve the value of status. Loop back until
1467 * we step below the beginning of the array. Make sure
1468 * we don't touch anything back there.
1469 */
1470 if (status != 0) {
1471 msbp--;
1472 while (msbp >= msb) {
1473 status = xfs_mod_incore_sb_unlocked(mp,
1474 msbp->msb_field, -(msbp->msb_delta), rsvd);
1475 ASSERT(status == 0);
1476 msbp--;
1477 }
1478 }
1479 XFS_SB_UNLOCK(mp, s);
1480 return (status);
1481}
1482
1483/*
1484 * xfs_getsb() is called to obtain the buffer for the superblock.
1485 * The buffer is returned locked and read in from disk.
1486 * The buffer should be released with a call to xfs_brelse().
1487 *
1488 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1489 * the superblock buffer if it can be locked without sleeping.
1490 * If it can't then we'll return NULL.
1491 */
1492xfs_buf_t *
1493xfs_getsb(
1494 xfs_mount_t *mp,
1495 int flags)
1496{
1497 xfs_buf_t *bp;
1498
1499 ASSERT(mp->m_sb_bp != NULL);
1500 bp = mp->m_sb_bp;
1501 if (flags & XFS_BUF_TRYLOCK) {
1502 if (!XFS_BUF_CPSEMA(bp)) {
1503 return NULL;
1504 }
1505 } else {
1506 XFS_BUF_PSEMA(bp, PRIBIO);
1507 }
1508 XFS_BUF_HOLD(bp);
1509 ASSERT(XFS_BUF_ISDONE(bp));
1510 return (bp);
1511}
1512
1513/*
1514 * Used to free the superblock along various error paths.
1515 */
1516void
1517xfs_freesb(
1518 xfs_mount_t *mp)
1519{
1520 xfs_buf_t *bp;
1521
1522 /*
1523 * Use xfs_getsb() so that the buffer will be locked
1524 * when we call xfs_buf_relse().
1525 */
1526 bp = xfs_getsb(mp, 0);
1527 XFS_BUF_UNMANAGE(bp);
1528 xfs_buf_relse(bp);
1529 mp->m_sb_bp = NULL;
1530}
1531
1532/*
1533 * See if the UUID is unique among mounted XFS filesystems.
1534 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1535 */
1536STATIC int
1537xfs_uuid_mount(
1538 xfs_mount_t *mp)
1539{
1540 if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
1541 cmn_err(CE_WARN,
1542 "XFS: Filesystem %s has nil UUID - can't mount",
1543 mp->m_fsname);
1544 return -1;
1545 }
1546 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
1547 cmn_err(CE_WARN,
1548 "XFS: Filesystem %s has duplicate UUID - can't mount",
1549 mp->m_fsname);
1550 return -1;
1551 }
1552 return 0;
1553}
1554
1555/*
1556 * Remove filesystem from the UUID table.
1557 */
1558STATIC void
1559xfs_uuid_unmount(
1560 xfs_mount_t *mp)
1561{
1562 uuid_table_remove(&mp->m_sb.sb_uuid);
1563}
1564
1565/*
1566 * Used to log changes to the superblock unit and width fields which could
1567 * be altered by the mount options. Only the first superblock is updated.
1568 */
1569STATIC void
1570xfs_mount_log_sbunit(
1571 xfs_mount_t *mp,
1572 __int64_t fields)
1573{
1574 xfs_trans_t *tp;
1575
1576 ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID));
1577
1578 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
1579 if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1580 XFS_DEFAULT_LOG_COUNT)) {
1581 xfs_trans_cancel(tp, 0);
1582 return;
1583 }
1584 xfs_mod_sb(tp, fields);
1585 xfs_trans_commit(tp, 0, NULL);
1586}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-27 21:05:35 -0500