2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. All Rights Reserved.
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.
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.
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.
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.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
34 #include "xfs_types.h"
38 #include "xfs_trans.h"
43 #include "xfs_dmapi.h"
44 #include "xfs_mount.h"
45 #include "xfs_bmap_btree.h"
46 #include "xfs_alloc_btree.h"
47 #include "xfs_ialloc_btree.h"
48 #include "xfs_dir_sf.h"
49 #include "xfs_dir2_sf.h"
50 #include "xfs_attr_sf.h"
51 #include "xfs_dinode.h"
52 #include "xfs_inode.h"
53 #include "xfs_btree.h"
54 #include "xfs_ialloc.h"
55 #include "xfs_alloc.h"
56 #include "xfs_rtalloc.h"
58 #include "xfs_error.h"
60 #include "xfs_quota.h"
61 #include "xfs_fsops.h"
63 STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t);
64 STATIC int xfs_uuid_mount(xfs_mount_t *);
65 STATIC void xfs_uuid_unmount(xfs_mount_t *mp);
66 STATIC void xfs_unmountfs_wait(xfs_mount_t *);
70 short type; /* 0 = integer
71 * 1 = binary / string (no translation)
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 }
123 * Return a pointer to an initialized xfs_mount structure.
130 mp = kmem_zalloc(sizeof(*mp), KM_SLEEP);
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");
137 * Initialize the AIL.
139 xfs_trans_ail_init(mp);
141 atomic_set(&mp->m_active_trans, 0);
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
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) *
169 kmem_free(mp->m_perag,
170 sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
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);
180 if (mp->m_fsname != NULL)
181 kmem_free(mp->m_fsname, mp->m_fsname_len);
182 if (mp->m_rtname != NULL)
183 kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1);
184 if (mp->m_logname != NULL)
185 kmem_free(mp->m_logname, strlen(mp->m_logname) + 1);
188 struct vfs *vfsp = XFS_MTOVFS(mp);
190 bhv_remove_all_vfsops(vfsp, 0);
191 VFS_REMOVEBHV(vfsp, &mp->m_bhv);
194 kmem_free(mp, sizeof(xfs_mount_t));
199 * Check the validity of the SB found.
202 xfs_mount_validate_sb(
207 * If the log device and data device have the
208 * same device number, the log is internal.
209 * Consequently, the sb_logstart should be non-zero. If
210 * we have a zero sb_logstart in this case, we may be trying to mount
211 * a volume filesystem in a non-volume manner.
213 if (sbp->sb_magicnum != XFS_SB_MAGIC) {
214 cmn_err(CE_WARN, "XFS: bad magic number");
215 return XFS_ERROR(EWRONGFS);
218 if (!XFS_SB_GOOD_VERSION(sbp)) {
219 cmn_err(CE_WARN, "XFS: bad version");
220 return XFS_ERROR(EWRONGFS);
224 sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
226 "XFS: filesystem is marked as having an external log; "
227 "specify logdev on the\nmount command line.");
228 XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(1)",
229 XFS_ERRLEVEL_HIGH, mp, sbp);
230 return XFS_ERROR(EFSCORRUPTED);
234 sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
236 "XFS: filesystem is marked as having an internal log; "
237 "don't specify logdev on\nthe mount command line.");
238 XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(2)",
239 XFS_ERRLEVEL_HIGH, mp, sbp);
240 return XFS_ERROR(EFSCORRUPTED);
244 * More sanity checking. These were stolen directly from
248 sbp->sb_agcount <= 0 ||
249 sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
250 sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
251 sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
252 sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
253 sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
254 sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
255 sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
256 sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
257 sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
258 sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
259 (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
260 (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
261 sbp->sb_imax_pct > 100)) {
262 cmn_err(CE_WARN, "XFS: SB sanity check 1 failed");
263 XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(3)",
264 XFS_ERRLEVEL_LOW, mp, sbp);
265 return XFS_ERROR(EFSCORRUPTED);
269 * Sanity check AG count, size fields against data size field
272 sbp->sb_dblocks == 0 ||
274 (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
275 sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
276 sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
277 cmn_err(CE_WARN, "XFS: SB sanity check 2 failed");
278 XFS_ERROR_REPORT("xfs_mount_validate_sb(4)",
279 XFS_ERRLEVEL_LOW, mp);
280 return XFS_ERROR(EFSCORRUPTED);
283 ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
284 ASSERT(sbp->sb_blocklog >= BBSHIFT);
286 #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
288 (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX ||
289 (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) {
290 #else /* Limited by UINT_MAX of sectors */
292 (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX ||
293 (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) {
296 "XFS: File system is too large to be mounted on this system.");
297 return XFS_ERROR(E2BIG);
300 if (unlikely(sbp->sb_inprogress)) {
301 cmn_err(CE_WARN, "XFS: file system busy");
302 XFS_ERROR_REPORT("xfs_mount_validate_sb(5)",
303 XFS_ERRLEVEL_LOW, mp);
304 return XFS_ERROR(EFSCORRUPTED);
308 * Version 1 directory format has never worked on Linux.
310 if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) {
312 "XFS: Attempted to mount file system using version 1 directory format");
313 return XFS_ERROR(ENOSYS);
317 * Until this is fixed only page-sized or smaller data blocks work.
319 if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
321 "XFS: Attempted to mount file system with blocksize %d bytes",
324 "XFS: Only page-sized (%ld) or less blocksizes currently work.",
326 return XFS_ERROR(ENOSYS);
333 xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount)
335 xfs_agnumber_t index, max_metadata;
339 xfs_sb_t *sbp = &mp->m_sb;
340 xfs_ino_t max_inum = XFS_MAXINUMBER_32;
342 /* Check to see if the filesystem can overflow 32 bit inodes */
343 agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
344 ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
346 /* Clear the mount flag if no inode can overflow 32 bits
347 * on this filesystem, or if specifically requested..
349 if ((mp->m_flags & XFS_MOUNT_32BITINOOPT) && ino > max_inum) {
350 mp->m_flags |= XFS_MOUNT_32BITINODES;
352 mp->m_flags &= ~XFS_MOUNT_32BITINODES;
355 /* If we can overflow then setup the ag headers accordingly */
356 if (mp->m_flags & XFS_MOUNT_32BITINODES) {
357 /* Calculate how much should be reserved for inodes to
358 * meet the max inode percentage.
360 if (mp->m_maxicount) {
363 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
365 icount += sbp->sb_agblocks - 1;
366 do_div(icount, mp->m_ialloc_blks);
367 max_metadata = icount;
369 max_metadata = agcount;
371 for (index = 0; index < agcount; index++) {
372 ino = XFS_AGINO_TO_INO(mp, index, agino);
373 if (ino > max_inum) {
378 /* This ag is prefered for inodes */
379 pag = &mp->m_perag[index];
380 pag->pagi_inodeok = 1;
381 if (index < max_metadata)
382 pag->pagf_metadata = 1;
385 /* Setup default behavior for smaller filesystems */
386 for (index = 0; index < agcount; index++) {
387 pag = &mp->m_perag[index];
388 pag->pagi_inodeok = 1;
397 * data - on disk version of sb
399 * dir - conversion direction: <0 - convert sb to buf
400 * >0 - convert buf to sb
401 * fields - which fields to copy (bitmask)
422 buf_ptr = (xfs_caddr_t)data;
423 mem_ptr = (xfs_caddr_t)sb;
426 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
427 first = xfs_sb_info[f].offset;
428 size = xfs_sb_info[f + 1].offset - first;
430 ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
432 if (size == 1 || xfs_sb_info[f].type == 1) {
434 memcpy(mem_ptr + first, buf_ptr + first, size);
436 memcpy(buf_ptr + first, mem_ptr + first, size);
441 INT_XLATE(*(__uint16_t*)(buf_ptr+first),
442 *(__uint16_t*)(mem_ptr+first),
446 INT_XLATE(*(__uint32_t*)(buf_ptr+first),
447 *(__uint32_t*)(mem_ptr+first),
451 INT_XLATE(*(__uint64_t*)(buf_ptr+first),
452 *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
459 fields &= ~(1LL << f);
466 * Does the initial read of the superblock.
469 xfs_readsb(xfs_mount_t *mp)
471 unsigned int sector_size;
472 unsigned int extra_flags;
477 ASSERT(mp->m_sb_bp == NULL);
478 ASSERT(mp->m_ddev_targp != NULL);
481 * Allocate a (locked) buffer to hold the superblock.
482 * This will be kept around at all times to optimize
483 * access to the superblock.
485 sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
486 extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
488 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
489 BTOBB(sector_size), extra_flags);
490 if (!bp || XFS_BUF_ISERROR(bp)) {
491 cmn_err(CE_WARN, "XFS: SB read failed");
492 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
495 ASSERT(XFS_BUF_ISBUSY(bp));
496 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
499 * Initialize the mount structure from the superblock.
500 * But first do some basic consistency checking.
502 sbp = XFS_BUF_TO_SBP(bp);
503 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS);
505 error = xfs_mount_validate_sb(mp, &(mp->m_sb));
507 cmn_err(CE_WARN, "XFS: SB validate failed");
512 * We must be able to do sector-sized and sector-aligned IO.
514 if (sector_size > mp->m_sb.sb_sectsize) {
516 "XFS: device supports only %u byte sectors (not %u)",
517 sector_size, mp->m_sb.sb_sectsize);
523 * If device sector size is smaller than the superblock size,
524 * re-read the superblock so the buffer is correctly sized.
526 if (sector_size < mp->m_sb.sb_sectsize) {
527 XFS_BUF_UNMANAGE(bp);
529 sector_size = mp->m_sb.sb_sectsize;
530 bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
531 BTOBB(sector_size), extra_flags);
532 if (!bp || XFS_BUF_ISERROR(bp)) {
533 cmn_err(CE_WARN, "XFS: SB re-read failed");
534 error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
537 ASSERT(XFS_BUF_ISBUSY(bp));
538 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
543 ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
548 XFS_BUF_UNMANAGE(bp);
558 * Mount initialization code establishing various mount
559 * fields from the superblock associated with the given
563 xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
567 mp->m_agfrotor = mp->m_agirotor = 0;
568 spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock");
569 mp->m_maxagi = mp->m_sb.sb_agcount;
570 mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
571 mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
572 mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
573 mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
574 mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
575 mp->m_litino = sbp->sb_inodesize -
576 ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
577 mp->m_blockmask = sbp->sb_blocksize - 1;
578 mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
579 mp->m_blockwmask = mp->m_blockwsize - 1;
580 INIT_LIST_HEAD(&mp->m_del_inodes);
583 * Setup for attributes, in case they get created.
584 * This value is for inodes getting attributes for the first time,
585 * the per-inode value is for old attribute values.
587 ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
588 switch (sbp->sb_inodesize) {
590 mp->m_attroffset = XFS_LITINO(mp) -
591 XFS_BMDR_SPACE_CALC(MINABTPTRS);
596 mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
601 ASSERT(mp->m_attroffset < XFS_LITINO(mp));
603 for (i = 0; i < 2; i++) {
604 mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
606 mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
609 for (i = 0; i < 2; i++) {
610 mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
612 mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
615 for (i = 0; i < 2; i++) {
616 mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
618 mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
622 mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
623 mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
625 mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
630 * This function does the following on an initial mount of a file system:
631 * - reads the superblock from disk and init the mount struct
632 * - if we're a 32-bit kernel, do a size check on the superblock
633 * so we don't mount terabyte filesystems
634 * - init mount struct realtime fields
635 * - allocate inode hash table for fs
636 * - init directory manager
637 * - perform recovery and init the log manager
646 xfs_sb_t *sbp = &(mp->m_sb);
649 int readio_log, writeio_log;
652 __int64_t update_flags;
653 uint quotamount, quotaflags;
655 int uuid_mounted = 0;
658 if (mp->m_sb_bp == NULL) {
659 if ((error = xfs_readsb(mp))) {
663 xfs_mount_common(mp, sbp);
666 * Check if sb_agblocks is aligned at stripe boundary
667 * If sb_agblocks is NOT aligned turn off m_dalign since
668 * allocator alignment is within an ag, therefore ag has
669 * to be aligned at stripe boundary.
672 if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
674 * If stripe unit and stripe width are not multiples
675 * of the fs blocksize turn off alignment.
677 if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
678 (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
679 if (mp->m_flags & XFS_MOUNT_RETERR) {
681 "XFS: alignment check 1 failed");
682 error = XFS_ERROR(EINVAL);
685 mp->m_dalign = mp->m_swidth = 0;
688 * Convert the stripe unit and width to FSBs.
690 mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
691 if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
692 if (mp->m_flags & XFS_MOUNT_RETERR) {
693 error = XFS_ERROR(EINVAL);
696 xfs_fs_cmn_err(CE_WARN, mp,
697 "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
698 mp->m_dalign, mp->m_swidth,
703 } else if (mp->m_dalign) {
704 mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
706 if (mp->m_flags & XFS_MOUNT_RETERR) {
707 xfs_fs_cmn_err(CE_WARN, mp,
708 "stripe alignment turned off: sunit(%d) less than bsize(%d)",
711 error = XFS_ERROR(EINVAL);
719 * Update superblock with new values
722 if (XFS_SB_VERSION_HASDALIGN(sbp)) {
723 if (sbp->sb_unit != mp->m_dalign) {
724 sbp->sb_unit = mp->m_dalign;
725 update_flags |= XFS_SB_UNIT;
727 if (sbp->sb_width != mp->m_swidth) {
728 sbp->sb_width = mp->m_swidth;
729 update_flags |= XFS_SB_WIDTH;
732 } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
733 XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
734 mp->m_dalign = sbp->sb_unit;
735 mp->m_swidth = sbp->sb_width;
738 xfs_alloc_compute_maxlevels(mp);
739 xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
740 xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
741 xfs_ialloc_compute_maxlevels(mp);
743 if (sbp->sb_imax_pct) {
746 /* Make sure the maximum inode count is a multiple of the
747 * units we allocate inodes in.
750 icount = sbp->sb_dblocks * sbp->sb_imax_pct;
752 do_div(icount, mp->m_ialloc_blks);
753 mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
758 mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
761 * XFS uses the uuid from the superblock as the unique
762 * identifier for fsid. We can not use the uuid from the volume
763 * since a single partition filesystem is identical to a single
764 * partition volume/filesystem.
766 if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&
767 (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
768 if (xfs_uuid_mount(mp)) {
769 error = XFS_ERROR(EINVAL);
773 ret64 = uuid_hash64(&sbp->sb_uuid);
774 memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64));
778 * Set the default minimum read and write sizes unless
779 * already specified in a mount option.
780 * We use smaller I/O sizes when the file system
781 * is being used for NFS service (wsync mount option).
783 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
784 if (mp->m_flags & XFS_MOUNT_WSYNC) {
785 readio_log = XFS_WSYNC_READIO_LOG;
786 writeio_log = XFS_WSYNC_WRITEIO_LOG;
788 readio_log = XFS_READIO_LOG_LARGE;
789 writeio_log = XFS_WRITEIO_LOG_LARGE;
792 readio_log = mp->m_readio_log;
793 writeio_log = mp->m_writeio_log;
797 * Set the number of readahead buffers to use based on
798 * physical memory size.
800 if (xfs_physmem <= 4096) /* <= 16MB */
801 mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
802 else if (xfs_physmem <= 8192) /* <= 32MB */
803 mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
805 mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
806 if (sbp->sb_blocklog > readio_log) {
807 mp->m_readio_log = sbp->sb_blocklog;
809 mp->m_readio_log = readio_log;
811 mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
812 if (sbp->sb_blocklog > writeio_log) {
813 mp->m_writeio_log = sbp->sb_blocklog;
815 mp->m_writeio_log = writeio_log;
817 mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
820 * Set the inode cluster size based on the physical memory
821 * size. This may still be overridden by the file system
822 * block size if it is larger than the chosen cluster size.
824 if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
825 mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE;
827 mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
830 * Set whether we're using inode alignment.
832 if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
833 mp->m_sb.sb_inoalignmt >=
834 XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
835 mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
837 mp->m_inoalign_mask = 0;
839 * If we are using stripe alignment, check whether
840 * the stripe unit is a multiple of the inode alignment
842 if (mp->m_dalign && mp->m_inoalign_mask &&
843 !(mp->m_dalign & mp->m_inoalign_mask))
844 mp->m_sinoalign = mp->m_dalign;
848 * Check that the data (and log if separate) are an ok size.
850 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
851 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
852 cmn_err(CE_WARN, "XFS: size check 1 failed");
853 error = XFS_ERROR(E2BIG);
856 error = xfs_read_buf(mp, mp->m_ddev_targp,
857 d - XFS_FSS_TO_BB(mp, 1),
858 XFS_FSS_TO_BB(mp, 1), 0, &bp);
862 cmn_err(CE_WARN, "XFS: size check 2 failed");
863 if (error == ENOSPC) {
864 error = XFS_ERROR(E2BIG);
869 if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
870 mp->m_logdev_targp != mp->m_ddev_targp) {
871 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
872 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
873 cmn_err(CE_WARN, "XFS: size check 3 failed");
874 error = XFS_ERROR(E2BIG);
877 error = xfs_read_buf(mp, mp->m_logdev_targp,
878 d - XFS_FSB_TO_BB(mp, 1),
879 XFS_FSB_TO_BB(mp, 1), 0, &bp);
883 cmn_err(CE_WARN, "XFS: size check 3 failed");
884 if (error == ENOSPC) {
885 error = XFS_ERROR(E2BIG);
892 * Initialize realtime fields in the mount structure
894 if ((error = xfs_rtmount_init(mp))) {
895 cmn_err(CE_WARN, "XFS: RT mount failed");
900 * For client case we are done now
902 if (mfsi_flags & XFS_MFSI_CLIENT) {
907 * Copies the low order bits of the timestamp and the randomly
908 * set "sequence" number out of a UUID.
910 uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
913 * The vfs structure needs to have a file system independent
914 * way of checking for the invariant file system ID. Since it
915 * can't look at mount structures it has a pointer to the data
916 * in the mount structure.
918 * File systems that don't support user level file handles (i.e.
919 * all of them except for XFS) will leave vfs_altfsid as NULL.
921 vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid;
922 mp->m_dmevmask = 0; /* not persistent; set after each mount */
925 * Select the right directory manager.
928 XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
933 * Initialize directory manager's entries.
938 * Initialize the attribute manager's entries.
940 mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
943 * Initialize the precomputed transaction reservations values.
948 * Allocate and initialize the inode hash table for this
955 * Allocate and initialize the per-ag data.
957 init_rwsem(&mp->m_peraglock);
959 kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
961 mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount);
964 * log's mount-time initialization. Perform 1st part recovery if needed
966 if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
967 error = xfs_log_mount(mp, mp->m_logdev_targp,
968 XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
969 XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
971 cmn_err(CE_WARN, "XFS: log mount failed");
974 } else { /* No log has been defined */
975 cmn_err(CE_WARN, "XFS: no log defined");
976 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
977 error = XFS_ERROR(EFSCORRUPTED);
982 * Get and sanity-check the root inode.
983 * Save the pointer to it in the mount structure.
985 error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
987 cmn_err(CE_WARN, "XFS: failed to read root inode");
994 if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
995 cmn_err(CE_WARN, "XFS: corrupted root inode");
996 prdev("Root inode %llu is not a directory",
997 mp->m_ddev_targp, (unsigned long long)rip->i_ino);
998 xfs_iunlock(rip, XFS_ILOCK_EXCL);
999 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
1001 error = XFS_ERROR(EFSCORRUPTED);
1004 mp->m_rootip = rip; /* save it */
1006 xfs_iunlock(rip, XFS_ILOCK_EXCL);
1009 * Initialize realtime inode pointers in the mount structure
1011 if ((error = xfs_rtmount_inodes(mp))) {
1013 * Free up the root inode.
1015 cmn_err(CE_WARN, "XFS: failed to read RT inodes");
1020 * If fs is not mounted readonly, then update the superblock
1021 * unit and width changes.
1023 if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY))
1024 xfs_mount_log_sbunit(mp, update_flags);
1027 * Initialise the XFS quota management subsystem for this mount
1029 if ((error = XFS_QM_INIT(mp, "amount, "aflags)))
1033 * Finish recovering the file system. This part needed to be
1034 * delayed until after the root and real-time bitmap inodes
1035 * were consistently read in.
1037 error = xfs_log_mount_finish(mp, mfsi_flags);
1039 cmn_err(CE_WARN, "XFS: log mount finish failed");
1044 * Complete the quota initialisation, post-log-replay component.
1046 if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))
1053 * Free up the root inode.
1057 xfs_log_unmount_dealloc(mp);
1061 for (agno = 0; agno < sbp->sb_agcount; agno++)
1062 if (mp->m_perag[agno].pagb_list)
1063 kmem_free(mp->m_perag[agno].pagb_list,
1064 sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
1065 kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
1070 xfs_uuid_unmount(mp);
1078 * This flushes out the inodes,dquots and the superblock, unmounts the
1079 * log and makes sure that incore structures are freed.
1082 xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
1084 struct vfs *vfsp = XFS_MTOVFS(mp);
1085 #if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1091 XFS_QM_DQPURGEALL(mp,
1092 XFS_QMOPT_UQUOTA | XFS_QMOPT_GQUOTA | XFS_QMOPT_UMOUNTING);
1095 * Flush out the log synchronously so that we know for sure
1096 * that nothing is pinned. This is important because bflush()
1097 * will skip pinned buffers.
1099 xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
1101 xfs_binval(mp->m_ddev_targp);
1102 if (mp->m_rtdev_targp) {
1103 xfs_binval(mp->m_rtdev_targp);
1106 xfs_unmountfs_writesb(mp);
1108 xfs_unmountfs_wait(mp); /* wait for async bufs */
1110 xfs_log_unmount(mp); /* Done! No more fs ops. */
1115 * All inodes from this mount point should be freed.
1117 ASSERT(mp->m_inodes == NULL);
1119 xfs_unmountfs_close(mp, cr);
1120 if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
1121 xfs_uuid_unmount(mp);
1123 #if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1125 * clear all error tags on this filesystem
1127 memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t));
1128 xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
1131 xfs_mount_free(mp, 1);
1136 xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
1138 if (mp->m_logdev_targp != mp->m_ddev_targp)
1139 xfs_free_buftarg(mp->m_logdev_targp, 1);
1140 if (mp->m_rtdev_targp)
1141 xfs_free_buftarg(mp->m_rtdev_targp, 1);
1142 xfs_free_buftarg(mp->m_ddev_targp, 0);
1146 xfs_unmountfs_wait(xfs_mount_t *mp)
1148 if (mp->m_logdev_targp != mp->m_ddev_targp)
1149 xfs_wait_buftarg(mp->m_logdev_targp);
1150 if (mp->m_rtdev_targp)
1151 xfs_wait_buftarg(mp->m_rtdev_targp);
1152 xfs_wait_buftarg(mp->m_ddev_targp);
1156 xfs_unmountfs_writesb(xfs_mount_t *mp)
1163 * skip superblock write if fs is read-only, or
1164 * if we are doing a forced umount.
1166 sbp = xfs_getsb(mp, 0);
1167 if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
1168 XFS_FORCED_SHUTDOWN(mp))) {
1170 * mark shared-readonly if desired
1172 sb = XFS_BUF_TO_SBP(sbp);
1173 if (mp->m_mk_sharedro) {
1174 if (!(sb->sb_flags & XFS_SBF_READONLY))
1175 sb->sb_flags |= XFS_SBF_READONLY;
1176 if (!XFS_SB_VERSION_HASSHARED(sb))
1177 XFS_SB_VERSION_ADDSHARED(sb);
1178 xfs_fs_cmn_err(CE_NOTE, mp,
1179 "Unmounting, marking shared read-only");
1181 XFS_BUF_UNDONE(sbp);
1182 XFS_BUF_UNREAD(sbp);
1183 XFS_BUF_UNDELAYWRITE(sbp);
1185 XFS_BUF_UNASYNC(sbp);
1186 ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
1187 xfsbdstrat(mp, sbp);
1188 /* Nevermind errors we might get here. */
1189 error = xfs_iowait(sbp);
1191 xfs_ioerror_alert("xfs_unmountfs_writesb",
1192 mp, sbp, XFS_BUF_ADDR(sbp));
1193 if (error && mp->m_mk_sharedro)
1194 xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
1201 * xfs_mod_sb() can be used to copy arbitrary changes to the
1202 * in-core superblock into the superblock buffer to be logged.
1203 * It does not provide the higher level of locking that is
1204 * needed to protect the in-core superblock from concurrent
1208 xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
1221 bp = xfs_trans_getsb(tp, mp, 0);
1222 sbp = XFS_BUF_TO_SBP(bp);
1223 first = sizeof(xfs_sb_t);
1226 /* translate/copy */
1228 xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields);
1230 /* find modified range */
1232 f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
1233 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1234 first = xfs_sb_info[f].offset;
1236 f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
1237 ASSERT((1LL << f) & XFS_SB_MOD_BITS);
1238 last = xfs_sb_info[f + 1].offset - 1;
1240 xfs_trans_log_buf(tp, bp, first, last);
1244 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1245 * a delta to a specified field in the in-core superblock. Simply
1246 * switch on the field indicated and apply the delta to that field.
1247 * Fields are not allowed to dip below zero, so if the delta would
1248 * do this do not apply it and return EINVAL.
1250 * The SB_LOCK must be held when this routine is called.
1253 xfs_mod_incore_sb_unlocked(xfs_mount_t *mp, xfs_sb_field_t field,
1254 int delta, int rsvd)
1256 int scounter; /* short counter for 32 bit fields */
1257 long long lcounter; /* long counter for 64 bit fields */
1258 long long res_used, rem;
1261 * With the in-core superblock spin lock held, switch
1262 * on the indicated field. Apply the delta to the
1263 * proper field. If the fields value would dip below
1264 * 0, then do not apply the delta and return EINVAL.
1267 case XFS_SBS_ICOUNT:
1268 lcounter = (long long)mp->m_sb.sb_icount;
1272 return (XFS_ERROR(EINVAL));
1274 mp->m_sb.sb_icount = lcounter;
1277 lcounter = (long long)mp->m_sb.sb_ifree;
1281 return (XFS_ERROR(EINVAL));
1283 mp->m_sb.sb_ifree = lcounter;
1285 case XFS_SBS_FDBLOCKS:
1287 lcounter = (long long)mp->m_sb.sb_fdblocks;
1288 res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
1290 if (delta > 0) { /* Putting blocks back */
1291 if (res_used > delta) {
1292 mp->m_resblks_avail += delta;
1294 rem = delta - res_used;
1295 mp->m_resblks_avail = mp->m_resblks;
1298 } else { /* Taking blocks away */
1303 * If were out of blocks, use any available reserved blocks if
1309 lcounter = (long long)mp->m_resblks_avail + delta;
1311 return (XFS_ERROR(ENOSPC));
1313 mp->m_resblks_avail = lcounter;
1315 } else { /* not reserved */
1316 return (XFS_ERROR(ENOSPC));
1321 mp->m_sb.sb_fdblocks = lcounter;
1323 case XFS_SBS_FREXTENTS:
1324 lcounter = (long long)mp->m_sb.sb_frextents;
1327 return (XFS_ERROR(ENOSPC));
1329 mp->m_sb.sb_frextents = lcounter;
1331 case XFS_SBS_DBLOCKS:
1332 lcounter = (long long)mp->m_sb.sb_dblocks;
1336 return (XFS_ERROR(EINVAL));
1338 mp->m_sb.sb_dblocks = lcounter;
1340 case XFS_SBS_AGCOUNT:
1341 scounter = mp->m_sb.sb_agcount;
1345 return (XFS_ERROR(EINVAL));
1347 mp->m_sb.sb_agcount = scounter;
1349 case XFS_SBS_IMAX_PCT:
1350 scounter = mp->m_sb.sb_imax_pct;
1354 return (XFS_ERROR(EINVAL));
1356 mp->m_sb.sb_imax_pct = scounter;
1358 case XFS_SBS_REXTSIZE:
1359 scounter = mp->m_sb.sb_rextsize;
1363 return (XFS_ERROR(EINVAL));
1365 mp->m_sb.sb_rextsize = scounter;
1367 case XFS_SBS_RBMBLOCKS:
1368 scounter = mp->m_sb.sb_rbmblocks;
1372 return (XFS_ERROR(EINVAL));
1374 mp->m_sb.sb_rbmblocks = scounter;
1376 case XFS_SBS_RBLOCKS:
1377 lcounter = (long long)mp->m_sb.sb_rblocks;
1381 return (XFS_ERROR(EINVAL));
1383 mp->m_sb.sb_rblocks = lcounter;
1385 case XFS_SBS_REXTENTS:
1386 lcounter = (long long)mp->m_sb.sb_rextents;
1390 return (XFS_ERROR(EINVAL));
1392 mp->m_sb.sb_rextents = lcounter;
1394 case XFS_SBS_REXTSLOG:
1395 scounter = mp->m_sb.sb_rextslog;
1399 return (XFS_ERROR(EINVAL));
1401 mp->m_sb.sb_rextslog = scounter;
1405 return (XFS_ERROR(EINVAL));
1410 * xfs_mod_incore_sb() is used to change a field in the in-core
1411 * superblock structure by the specified delta. This modification
1412 * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
1413 * routine to do the work.
1416 xfs_mod_incore_sb(xfs_mount_t *mp, xfs_sb_field_t field, int delta, int rsvd)
1421 s = XFS_SB_LOCK(mp);
1422 status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
1423 XFS_SB_UNLOCK(mp, s);
1428 * xfs_mod_incore_sb_batch() is used to change more than one field
1429 * in the in-core superblock structure at a time. This modification
1430 * is protected by a lock internal to this module. The fields and
1431 * changes to those fields are specified in the array of xfs_mod_sb
1432 * structures passed in.
1434 * Either all of the specified deltas will be applied or none of
1435 * them will. If any modified field dips below 0, then all modifications
1436 * will be backed out and EINVAL will be returned.
1439 xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
1446 * Loop through the array of mod structures and apply each
1447 * individually. If any fail, then back out all those
1448 * which have already been applied. Do all of this within
1449 * the scope of the SB_LOCK so that all of the changes will
1452 s = XFS_SB_LOCK(mp);
1454 for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
1456 * Apply the delta at index n. If it fails, break
1457 * from the loop so we'll fall into the undo loop
1460 status = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field,
1461 msbp->msb_delta, rsvd);
1468 * If we didn't complete the loop above, then back out
1469 * any changes made to the superblock. If you add code
1470 * between the loop above and here, make sure that you
1471 * preserve the value of status. Loop back until
1472 * we step below the beginning of the array. Make sure
1473 * we don't touch anything back there.
1477 while (msbp >= msb) {
1478 status = xfs_mod_incore_sb_unlocked(mp,
1479 msbp->msb_field, -(msbp->msb_delta), rsvd);
1480 ASSERT(status == 0);
1484 XFS_SB_UNLOCK(mp, s);
1489 * xfs_getsb() is called to obtain the buffer for the superblock.
1490 * The buffer is returned locked and read in from disk.
1491 * The buffer should be released with a call to xfs_brelse().
1493 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1494 * the superblock buffer if it can be locked without sleeping.
1495 * If it can't then we'll return NULL.
1504 ASSERT(mp->m_sb_bp != NULL);
1506 if (flags & XFS_BUF_TRYLOCK) {
1507 if (!XFS_BUF_CPSEMA(bp)) {
1511 XFS_BUF_PSEMA(bp, PRIBIO);
1514 ASSERT(XFS_BUF_ISDONE(bp));
1519 * Used to free the superblock along various error paths.
1528 * Use xfs_getsb() so that the buffer will be locked
1529 * when we call xfs_buf_relse().
1531 bp = xfs_getsb(mp, 0);
1532 XFS_BUF_UNMANAGE(bp);
1538 * See if the UUID is unique among mounted XFS filesystems.
1539 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1545 if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
1547 "XFS: Filesystem %s has nil UUID - can't mount",
1551 if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
1553 "XFS: Filesystem %s has duplicate UUID - can't mount",
1561 * Remove filesystem from the UUID table.
1567 uuid_table_remove(&mp->m_sb.sb_uuid);
1571 * Used to log changes to the superblock unit and width fields which could
1572 * be altered by the mount options. Only the first superblock is updated.
1575 xfs_mount_log_sbunit(
1581 ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID));
1583 tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
1584 if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
1585 XFS_DEFAULT_LOG_COUNT)) {
1586 xfs_trans_cancel(tp, 0);
1589 xfs_mod_sb(tp, fields);
1590 xfs_trans_commit(tp, 0, NULL);