2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "xfs_types.h"
24 #include "xfs_trans.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir_sf.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_btree.h"
40 #include "xfs_ialloc.h"
41 #include "xfs_alloc.h"
42 #include "xfs_rtalloc.h"
44 #include "xfs_error.h"
46 #include "xfs_quota.h"
47 #include "xfs_fsops.h"
49 STATIC
void xfs_mount_log_sbunit(xfs_mount_t
*, __int64_t
);
50 STATIC
int xfs_uuid_mount(xfs_mount_t
*);
51 STATIC
void xfs_uuid_unmount(xfs_mount_t
*mp
);
52 STATIC
void xfs_unmountfs_wait(xfs_mount_t
*);
56 STATIC
void xfs_icsb_destroy_counters(xfs_mount_t
*);
57 STATIC
void xfs_icsb_balance_counter(xfs_mount_t
*, xfs_sb_field_t
, int);
58 STATIC
void xfs_icsb_sync_counters(xfs_mount_t
*);
59 STATIC
int xfs_icsb_modify_counters(xfs_mount_t
*, xfs_sb_field_t
,
61 STATIC
int xfs_icsb_modify_counters_locked(xfs_mount_t
*, xfs_sb_field_t
,
63 STATIC
int xfs_icsb_disable_counter(xfs_mount_t
*, xfs_sb_field_t
);
67 #define xfs_icsb_destroy_counters(mp) do { } while (0)
68 #define xfs_icsb_balance_counter(mp, a, b) do { } while (0)
69 #define xfs_icsb_sync_counters(mp) do { } while (0)
70 #define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0)
71 #define xfs_icsb_modify_counters_locked(mp, a, b, c) do { } while (0)
77 short type
; /* 0 = integer
78 * 1 = binary / string (no translation)
81 { offsetof(xfs_sb_t
, sb_magicnum
), 0 },
82 { offsetof(xfs_sb_t
, sb_blocksize
), 0 },
83 { offsetof(xfs_sb_t
, sb_dblocks
), 0 },
84 { offsetof(xfs_sb_t
, sb_rblocks
), 0 },
85 { offsetof(xfs_sb_t
, sb_rextents
), 0 },
86 { offsetof(xfs_sb_t
, sb_uuid
), 1 },
87 { offsetof(xfs_sb_t
, sb_logstart
), 0 },
88 { offsetof(xfs_sb_t
, sb_rootino
), 0 },
89 { offsetof(xfs_sb_t
, sb_rbmino
), 0 },
90 { offsetof(xfs_sb_t
, sb_rsumino
), 0 },
91 { offsetof(xfs_sb_t
, sb_rextsize
), 0 },
92 { offsetof(xfs_sb_t
, sb_agblocks
), 0 },
93 { offsetof(xfs_sb_t
, sb_agcount
), 0 },
94 { offsetof(xfs_sb_t
, sb_rbmblocks
), 0 },
95 { offsetof(xfs_sb_t
, sb_logblocks
), 0 },
96 { offsetof(xfs_sb_t
, sb_versionnum
), 0 },
97 { offsetof(xfs_sb_t
, sb_sectsize
), 0 },
98 { offsetof(xfs_sb_t
, sb_inodesize
), 0 },
99 { offsetof(xfs_sb_t
, sb_inopblock
), 0 },
100 { offsetof(xfs_sb_t
, sb_fname
[0]), 1 },
101 { offsetof(xfs_sb_t
, sb_blocklog
), 0 },
102 { offsetof(xfs_sb_t
, sb_sectlog
), 0 },
103 { offsetof(xfs_sb_t
, sb_inodelog
), 0 },
104 { offsetof(xfs_sb_t
, sb_inopblog
), 0 },
105 { offsetof(xfs_sb_t
, sb_agblklog
), 0 },
106 { offsetof(xfs_sb_t
, sb_rextslog
), 0 },
107 { offsetof(xfs_sb_t
, sb_inprogress
), 0 },
108 { offsetof(xfs_sb_t
, sb_imax_pct
), 0 },
109 { offsetof(xfs_sb_t
, sb_icount
), 0 },
110 { offsetof(xfs_sb_t
, sb_ifree
), 0 },
111 { offsetof(xfs_sb_t
, sb_fdblocks
), 0 },
112 { offsetof(xfs_sb_t
, sb_frextents
), 0 },
113 { offsetof(xfs_sb_t
, sb_uquotino
), 0 },
114 { offsetof(xfs_sb_t
, sb_gquotino
), 0 },
115 { offsetof(xfs_sb_t
, sb_qflags
), 0 },
116 { offsetof(xfs_sb_t
, sb_flags
), 0 },
117 { offsetof(xfs_sb_t
, sb_shared_vn
), 0 },
118 { offsetof(xfs_sb_t
, sb_inoalignmt
), 0 },
119 { offsetof(xfs_sb_t
, sb_unit
), 0 },
120 { offsetof(xfs_sb_t
, sb_width
), 0 },
121 { offsetof(xfs_sb_t
, sb_dirblklog
), 0 },
122 { offsetof(xfs_sb_t
, sb_logsectlog
), 0 },
123 { offsetof(xfs_sb_t
, sb_logsectsize
),0 },
124 { offsetof(xfs_sb_t
, sb_logsunit
), 0 },
125 { offsetof(xfs_sb_t
, sb_features2
), 0 },
126 { sizeof(xfs_sb_t
), 0 }
130 * Return a pointer to an initialized xfs_mount structure.
137 mp
= kmem_zalloc(sizeof(xfs_mount_t
), KM_SLEEP
);
139 if (xfs_icsb_init_counters(mp
)) {
140 mp
->m_flags
|= XFS_MOUNT_NO_PERCPU_SB
;
143 AIL_LOCKINIT(&mp
->m_ail_lock
, "xfs_ail");
144 spinlock_init(&mp
->m_sb_lock
, "xfs_sb");
145 mutex_init(&mp
->m_ilock
);
146 initnsema(&mp
->m_growlock
, 1, "xfs_grow");
148 * Initialize the AIL.
150 xfs_trans_ail_init(mp
);
152 atomic_set(&mp
->m_active_trans
, 0);
158 * Free up the resources associated with a mount structure. Assume that
159 * the structure was initially zeroed, so we can tell which fields got
175 for (agno
= 0; agno
< mp
->m_maxagi
; agno
++)
176 if (mp
->m_perag
[agno
].pagb_list
)
177 kmem_free(mp
->m_perag
[agno
].pagb_list
,
178 sizeof(xfs_perag_busy_t
) *
180 kmem_free(mp
->m_perag
,
181 sizeof(xfs_perag_t
) * mp
->m_sb
.sb_agcount
);
184 AIL_LOCK_DESTROY(&mp
->m_ail_lock
);
185 spinlock_destroy(&mp
->m_sb_lock
);
186 mutex_destroy(&mp
->m_ilock
);
187 freesema(&mp
->m_growlock
);
191 if (mp
->m_fsname
!= NULL
)
192 kmem_free(mp
->m_fsname
, mp
->m_fsname_len
);
193 if (mp
->m_rtname
!= NULL
)
194 kmem_free(mp
->m_rtname
, strlen(mp
->m_rtname
) + 1);
195 if (mp
->m_logname
!= NULL
)
196 kmem_free(mp
->m_logname
, strlen(mp
->m_logname
) + 1);
199 struct vfs
*vfsp
= XFS_MTOVFS(mp
);
201 bhv_remove_all_vfsops(vfsp
, 0);
202 VFS_REMOVEBHV(vfsp
, &mp
->m_bhv
);
205 xfs_icsb_destroy_counters(mp
);
206 kmem_free(mp
, sizeof(xfs_mount_t
));
211 * Check the validity of the SB found.
214 xfs_mount_validate_sb(
220 * If the log device and data device have the
221 * same device number, the log is internal.
222 * Consequently, the sb_logstart should be non-zero. If
223 * we have a zero sb_logstart in this case, we may be trying to mount
224 * a volume filesystem in a non-volume manner.
226 if (sbp
->sb_magicnum
!= XFS_SB_MAGIC
) {
227 xfs_fs_mount_cmn_err(flags
, "bad magic number");
228 return XFS_ERROR(EWRONGFS
);
231 if (!XFS_SB_GOOD_VERSION(sbp
)) {
232 xfs_fs_mount_cmn_err(flags
, "bad version");
233 return XFS_ERROR(EWRONGFS
);
237 sbp
->sb_logstart
== 0 && mp
->m_logdev_targp
== mp
->m_ddev_targp
)) {
238 xfs_fs_mount_cmn_err(flags
,
239 "filesystem is marked as having an external log; "
240 "specify logdev on the\nmount command line.");
241 return XFS_ERROR(EINVAL
);
245 sbp
->sb_logstart
!= 0 && mp
->m_logdev_targp
!= mp
->m_ddev_targp
)) {
246 xfs_fs_mount_cmn_err(flags
,
247 "filesystem is marked as having an internal log; "
248 "do not specify logdev on\nthe mount command line.");
249 return XFS_ERROR(EINVAL
);
253 * More sanity checking. These were stolen directly from
257 sbp
->sb_agcount
<= 0 ||
258 sbp
->sb_sectsize
< XFS_MIN_SECTORSIZE
||
259 sbp
->sb_sectsize
> XFS_MAX_SECTORSIZE
||
260 sbp
->sb_sectlog
< XFS_MIN_SECTORSIZE_LOG
||
261 sbp
->sb_sectlog
> XFS_MAX_SECTORSIZE_LOG
||
262 sbp
->sb_blocksize
< XFS_MIN_BLOCKSIZE
||
263 sbp
->sb_blocksize
> XFS_MAX_BLOCKSIZE
||
264 sbp
->sb_blocklog
< XFS_MIN_BLOCKSIZE_LOG
||
265 sbp
->sb_blocklog
> XFS_MAX_BLOCKSIZE_LOG
||
266 sbp
->sb_inodesize
< XFS_DINODE_MIN_SIZE
||
267 sbp
->sb_inodesize
> XFS_DINODE_MAX_SIZE
||
268 sbp
->sb_inodelog
< XFS_DINODE_MIN_LOG
||
269 sbp
->sb_inodelog
> XFS_DINODE_MAX_LOG
||
270 (sbp
->sb_blocklog
- sbp
->sb_inodelog
!= sbp
->sb_inopblog
) ||
271 (sbp
->sb_rextsize
* sbp
->sb_blocksize
> XFS_MAX_RTEXTSIZE
) ||
272 (sbp
->sb_rextsize
* sbp
->sb_blocksize
< XFS_MIN_RTEXTSIZE
) ||
273 (sbp
->sb_imax_pct
> 100 /* zero sb_imax_pct is valid */))) {
274 xfs_fs_mount_cmn_err(flags
, "SB sanity check 1 failed");
275 return XFS_ERROR(EFSCORRUPTED
);
279 * Sanity check AG count, size fields against data size field
282 sbp
->sb_dblocks
== 0 ||
284 (xfs_drfsbno_t
)sbp
->sb_agcount
* sbp
->sb_agblocks
||
285 sbp
->sb_dblocks
< (xfs_drfsbno_t
)(sbp
->sb_agcount
- 1) *
286 sbp
->sb_agblocks
+ XFS_MIN_AG_BLOCKS
)) {
287 xfs_fs_mount_cmn_err(flags
, "SB sanity check 2 failed");
288 return XFS_ERROR(EFSCORRUPTED
);
291 ASSERT(PAGE_SHIFT
>= sbp
->sb_blocklog
);
292 ASSERT(sbp
->sb_blocklog
>= BBSHIFT
);
294 #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
296 (sbp
->sb_dblocks
>> (PAGE_SHIFT
- sbp
->sb_blocklog
)) > ULONG_MAX
||
297 (sbp
->sb_rblocks
>> (PAGE_SHIFT
- sbp
->sb_blocklog
)) > ULONG_MAX
)) {
298 #else /* Limited by UINT_MAX of sectors */
300 (sbp
->sb_dblocks
<< (sbp
->sb_blocklog
- BBSHIFT
)) > UINT_MAX
||
301 (sbp
->sb_rblocks
<< (sbp
->sb_blocklog
- BBSHIFT
)) > UINT_MAX
)) {
303 xfs_fs_mount_cmn_err(flags
,
304 "file system too large to be mounted on this system.");
305 return XFS_ERROR(E2BIG
);
308 if (unlikely(sbp
->sb_inprogress
)) {
309 xfs_fs_mount_cmn_err(flags
, "file system busy");
310 return XFS_ERROR(EFSCORRUPTED
);
314 * Version 1 directory format has never worked on Linux.
316 if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp
))) {
317 xfs_fs_mount_cmn_err(flags
,
318 "file system using version 1 directory format");
319 return XFS_ERROR(ENOSYS
);
323 * Until this is fixed only page-sized or smaller data blocks work.
325 if (unlikely(sbp
->sb_blocksize
> PAGE_SIZE
)) {
326 xfs_fs_mount_cmn_err(flags
,
327 "file system with blocksize %d bytes",
329 xfs_fs_mount_cmn_err(flags
,
330 "only pagesize (%ld) or less will currently work.",
332 return XFS_ERROR(ENOSYS
);
339 xfs_initialize_perag(
342 xfs_agnumber_t agcount
)
344 xfs_agnumber_t index
, max_metadata
;
348 xfs_sb_t
*sbp
= &mp
->m_sb
;
349 xfs_ino_t max_inum
= XFS_MAXINUMBER_32
;
351 /* Check to see if the filesystem can overflow 32 bit inodes */
352 agino
= XFS_OFFBNO_TO_AGINO(mp
, sbp
->sb_agblocks
- 1, 0);
353 ino
= XFS_AGINO_TO_INO(mp
, agcount
- 1, agino
);
355 /* Clear the mount flag if no inode can overflow 32 bits
356 * on this filesystem, or if specifically requested..
358 if ((vfs
->vfs_flag
& VFS_32BITINODES
) && ino
> max_inum
) {
359 mp
->m_flags
|= XFS_MOUNT_32BITINODES
;
361 mp
->m_flags
&= ~XFS_MOUNT_32BITINODES
;
364 /* If we can overflow then setup the ag headers accordingly */
365 if (mp
->m_flags
& XFS_MOUNT_32BITINODES
) {
366 /* Calculate how much should be reserved for inodes to
367 * meet the max inode percentage.
369 if (mp
->m_maxicount
) {
372 icount
= sbp
->sb_dblocks
* sbp
->sb_imax_pct
;
374 icount
+= sbp
->sb_agblocks
- 1;
375 do_div(icount
, sbp
->sb_agblocks
);
376 max_metadata
= icount
;
378 max_metadata
= agcount
;
380 for (index
= 0; index
< agcount
; index
++) {
381 ino
= XFS_AGINO_TO_INO(mp
, index
, agino
);
382 if (ino
> max_inum
) {
387 /* This ag is preferred for inodes */
388 pag
= &mp
->m_perag
[index
];
389 pag
->pagi_inodeok
= 1;
390 if (index
< max_metadata
)
391 pag
->pagf_metadata
= 1;
394 /* Setup default behavior for smaller filesystems */
395 for (index
= 0; index
< agcount
; index
++) {
396 pag
= &mp
->m_perag
[index
];
397 pag
->pagi_inodeok
= 1;
406 * data - on disk version of sb
408 * dir - conversion direction: <0 - convert sb to buf
409 * >0 - convert buf to sb
410 * fields - which fields to copy (bitmask)
431 buf_ptr
= (xfs_caddr_t
)data
;
432 mem_ptr
= (xfs_caddr_t
)sb
;
435 f
= (xfs_sb_field_t
)xfs_lowbit64((__uint64_t
)fields
);
436 first
= xfs_sb_info
[f
].offset
;
437 size
= xfs_sb_info
[f
+ 1].offset
- first
;
439 ASSERT(xfs_sb_info
[f
].type
== 0 || xfs_sb_info
[f
].type
== 1);
441 if (size
== 1 || xfs_sb_info
[f
].type
== 1) {
443 memcpy(mem_ptr
+ first
, buf_ptr
+ first
, size
);
445 memcpy(buf_ptr
+ first
, mem_ptr
+ first
, size
);
450 INT_XLATE(*(__uint16_t
*)(buf_ptr
+first
),
451 *(__uint16_t
*)(mem_ptr
+first
),
455 INT_XLATE(*(__uint32_t
*)(buf_ptr
+first
),
456 *(__uint32_t
*)(mem_ptr
+first
),
460 INT_XLATE(*(__uint64_t
*)(buf_ptr
+first
),
461 *(__uint64_t
*)(mem_ptr
+first
), dir
, ARCH_CONVERT
);
468 fields
&= ~(1LL << f
);
475 * Does the initial read of the superblock.
478 xfs_readsb(xfs_mount_t
*mp
, int flags
)
480 unsigned int sector_size
;
481 unsigned int extra_flags
;
486 ASSERT(mp
->m_sb_bp
== NULL
);
487 ASSERT(mp
->m_ddev_targp
!= NULL
);
490 * Allocate a (locked) buffer to hold the superblock.
491 * This will be kept around at all times to optimize
492 * access to the superblock.
494 sector_size
= xfs_getsize_buftarg(mp
->m_ddev_targp
);
495 extra_flags
= XFS_BUF_LOCK
| XFS_BUF_MANAGE
| XFS_BUF_MAPPED
;
497 bp
= xfs_buf_read_flags(mp
->m_ddev_targp
, XFS_SB_DADDR
,
498 BTOBB(sector_size
), extra_flags
);
499 if (!bp
|| XFS_BUF_ISERROR(bp
)) {
500 xfs_fs_mount_cmn_err(flags
, "SB read failed");
501 error
= bp
? XFS_BUF_GETERROR(bp
) : ENOMEM
;
504 ASSERT(XFS_BUF_ISBUSY(bp
));
505 ASSERT(XFS_BUF_VALUSEMA(bp
) <= 0);
508 * Initialize the mount structure from the superblock.
509 * But first do some basic consistency checking.
511 sbp
= XFS_BUF_TO_SBP(bp
);
512 xfs_xlatesb(XFS_BUF_PTR(bp
), &(mp
->m_sb
), 1, XFS_SB_ALL_BITS
);
514 error
= xfs_mount_validate_sb(mp
, &(mp
->m_sb
), flags
);
516 xfs_fs_mount_cmn_err(flags
, "SB validate failed");
521 * We must be able to do sector-sized and sector-aligned IO.
523 if (sector_size
> mp
->m_sb
.sb_sectsize
) {
524 xfs_fs_mount_cmn_err(flags
,
525 "device supports only %u byte sectors (not %u)",
526 sector_size
, mp
->m_sb
.sb_sectsize
);
532 * If device sector size is smaller than the superblock size,
533 * re-read the superblock so the buffer is correctly sized.
535 if (sector_size
< mp
->m_sb
.sb_sectsize
) {
536 XFS_BUF_UNMANAGE(bp
);
538 sector_size
= mp
->m_sb
.sb_sectsize
;
539 bp
= xfs_buf_read_flags(mp
->m_ddev_targp
, XFS_SB_DADDR
,
540 BTOBB(sector_size
), extra_flags
);
541 if (!bp
|| XFS_BUF_ISERROR(bp
)) {
542 xfs_fs_mount_cmn_err(flags
, "SB re-read failed");
543 error
= bp
? XFS_BUF_GETERROR(bp
) : ENOMEM
;
546 ASSERT(XFS_BUF_ISBUSY(bp
));
547 ASSERT(XFS_BUF_VALUSEMA(bp
) <= 0);
550 xfs_icsb_balance_counter(mp
, XFS_SBS_ICOUNT
, 0);
551 xfs_icsb_balance_counter(mp
, XFS_SBS_IFREE
, 0);
552 xfs_icsb_balance_counter(mp
, XFS_SBS_FDBLOCKS
, 0);
556 ASSERT(XFS_BUF_VALUSEMA(bp
) > 0);
561 XFS_BUF_UNMANAGE(bp
);
571 * Mount initialization code establishing various mount
572 * fields from the superblock associated with the given
576 xfs_mount_common(xfs_mount_t
*mp
, xfs_sb_t
*sbp
)
580 mp
->m_agfrotor
= mp
->m_agirotor
= 0;
581 spinlock_init(&mp
->m_agirotor_lock
, "m_agirotor_lock");
582 mp
->m_maxagi
= mp
->m_sb
.sb_agcount
;
583 mp
->m_blkbit_log
= sbp
->sb_blocklog
+ XFS_NBBYLOG
;
584 mp
->m_blkbb_log
= sbp
->sb_blocklog
- BBSHIFT
;
585 mp
->m_sectbb_log
= sbp
->sb_sectlog
- BBSHIFT
;
586 mp
->m_agno_log
= xfs_highbit32(sbp
->sb_agcount
- 1) + 1;
587 mp
->m_agino_log
= sbp
->sb_inopblog
+ sbp
->sb_agblklog
;
588 mp
->m_litino
= sbp
->sb_inodesize
-
589 ((uint
)sizeof(xfs_dinode_core_t
) + (uint
)sizeof(xfs_agino_t
));
590 mp
->m_blockmask
= sbp
->sb_blocksize
- 1;
591 mp
->m_blockwsize
= sbp
->sb_blocksize
>> XFS_WORDLOG
;
592 mp
->m_blockwmask
= mp
->m_blockwsize
- 1;
593 INIT_LIST_HEAD(&mp
->m_del_inodes
);
596 * Setup for attributes, in case they get created.
597 * This value is for inodes getting attributes for the first time,
598 * the per-inode value is for old attribute values.
600 ASSERT(sbp
->sb_inodesize
>= 256 && sbp
->sb_inodesize
<= 2048);
601 switch (sbp
->sb_inodesize
) {
603 mp
->m_attroffset
= XFS_LITINO(mp
) -
604 XFS_BMDR_SPACE_CALC(MINABTPTRS
);
609 mp
->m_attroffset
= XFS_BMDR_SPACE_CALC(6 * MINABTPTRS
);
614 ASSERT(mp
->m_attroffset
< XFS_LITINO(mp
));
616 for (i
= 0; i
< 2; i
++) {
617 mp
->m_alloc_mxr
[i
] = XFS_BTREE_BLOCK_MAXRECS(sbp
->sb_blocksize
,
619 mp
->m_alloc_mnr
[i
] = XFS_BTREE_BLOCK_MINRECS(sbp
->sb_blocksize
,
622 for (i
= 0; i
< 2; i
++) {
623 mp
->m_bmap_dmxr
[i
] = XFS_BTREE_BLOCK_MAXRECS(sbp
->sb_blocksize
,
625 mp
->m_bmap_dmnr
[i
] = XFS_BTREE_BLOCK_MINRECS(sbp
->sb_blocksize
,
628 for (i
= 0; i
< 2; i
++) {
629 mp
->m_inobt_mxr
[i
] = XFS_BTREE_BLOCK_MAXRECS(sbp
->sb_blocksize
,
631 mp
->m_inobt_mnr
[i
] = XFS_BTREE_BLOCK_MINRECS(sbp
->sb_blocksize
,
635 mp
->m_bsize
= XFS_FSB_TO_BB(mp
, 1);
636 mp
->m_ialloc_inos
= (int)MAX((__uint16_t
)XFS_INODES_PER_CHUNK
,
638 mp
->m_ialloc_blks
= mp
->m_ialloc_inos
>> sbp
->sb_inopblog
;
643 * This function does the following on an initial mount of a file system:
644 * - reads the superblock from disk and init the mount struct
645 * - if we're a 32-bit kernel, do a size check on the superblock
646 * so we don't mount terabyte filesystems
647 * - init mount struct realtime fields
648 * - allocate inode hash table for fs
649 * - init directory manager
650 * - perform recovery and init the log manager
659 xfs_sb_t
*sbp
= &(mp
->m_sb
);
662 int readio_log
, writeio_log
;
665 __int64_t update_flags
;
666 uint quotamount
, quotaflags
;
668 int uuid_mounted
= 0;
671 if (mp
->m_sb_bp
== NULL
) {
672 if ((error
= xfs_readsb(mp
, mfsi_flags
))) {
676 xfs_mount_common(mp
, sbp
);
679 * Check if sb_agblocks is aligned at stripe boundary
680 * If sb_agblocks is NOT aligned turn off m_dalign since
681 * allocator alignment is within an ag, therefore ag has
682 * to be aligned at stripe boundary.
685 if (mp
->m_dalign
&& !(mfsi_flags
& XFS_MFSI_SECOND
)) {
687 * If stripe unit and stripe width are not multiples
688 * of the fs blocksize turn off alignment.
690 if ((BBTOB(mp
->m_dalign
) & mp
->m_blockmask
) ||
691 (BBTOB(mp
->m_swidth
) & mp
->m_blockmask
)) {
692 if (mp
->m_flags
& XFS_MOUNT_RETERR
) {
694 "XFS: alignment check 1 failed");
695 error
= XFS_ERROR(EINVAL
);
698 mp
->m_dalign
= mp
->m_swidth
= 0;
701 * Convert the stripe unit and width to FSBs.
703 mp
->m_dalign
= XFS_BB_TO_FSBT(mp
, mp
->m_dalign
);
704 if (mp
->m_dalign
&& (sbp
->sb_agblocks
% mp
->m_dalign
)) {
705 if (mp
->m_flags
& XFS_MOUNT_RETERR
) {
706 error
= XFS_ERROR(EINVAL
);
709 xfs_fs_cmn_err(CE_WARN
, mp
,
710 "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
711 mp
->m_dalign
, mp
->m_swidth
,
716 } else if (mp
->m_dalign
) {
717 mp
->m_swidth
= XFS_BB_TO_FSBT(mp
, mp
->m_swidth
);
719 if (mp
->m_flags
& XFS_MOUNT_RETERR
) {
720 xfs_fs_cmn_err(CE_WARN
, mp
,
721 "stripe alignment turned off: sunit(%d) less than bsize(%d)",
724 error
= XFS_ERROR(EINVAL
);
732 * Update superblock with new values
735 if (XFS_SB_VERSION_HASDALIGN(sbp
)) {
736 if (sbp
->sb_unit
!= mp
->m_dalign
) {
737 sbp
->sb_unit
= mp
->m_dalign
;
738 update_flags
|= XFS_SB_UNIT
;
740 if (sbp
->sb_width
!= mp
->m_swidth
) {
741 sbp
->sb_width
= mp
->m_swidth
;
742 update_flags
|= XFS_SB_WIDTH
;
745 } else if ((mp
->m_flags
& XFS_MOUNT_NOALIGN
) != XFS_MOUNT_NOALIGN
&&
746 XFS_SB_VERSION_HASDALIGN(&mp
->m_sb
)) {
747 mp
->m_dalign
= sbp
->sb_unit
;
748 mp
->m_swidth
= sbp
->sb_width
;
751 xfs_alloc_compute_maxlevels(mp
);
752 xfs_bmap_compute_maxlevels(mp
, XFS_DATA_FORK
);
753 xfs_bmap_compute_maxlevels(mp
, XFS_ATTR_FORK
);
754 xfs_ialloc_compute_maxlevels(mp
);
756 if (sbp
->sb_imax_pct
) {
759 /* Make sure the maximum inode count is a multiple of the
760 * units we allocate inodes in.
763 icount
= sbp
->sb_dblocks
* sbp
->sb_imax_pct
;
765 do_div(icount
, mp
->m_ialloc_blks
);
766 mp
->m_maxicount
= (icount
* mp
->m_ialloc_blks
) <<
771 mp
->m_maxioffset
= xfs_max_file_offset(sbp
->sb_blocklog
);
774 * XFS uses the uuid from the superblock as the unique
775 * identifier for fsid. We can not use the uuid from the volume
776 * since a single partition filesystem is identical to a single
777 * partition volume/filesystem.
779 if ((mfsi_flags
& XFS_MFSI_SECOND
) == 0 &&
780 (mp
->m_flags
& XFS_MOUNT_NOUUID
) == 0) {
781 if (xfs_uuid_mount(mp
)) {
782 error
= XFS_ERROR(EINVAL
);
786 ret64
= uuid_hash64(&sbp
->sb_uuid
);
787 memcpy(&vfsp
->vfs_fsid
, &ret64
, sizeof(ret64
));
791 * Set the default minimum read and write sizes unless
792 * already specified in a mount option.
793 * We use smaller I/O sizes when the file system
794 * is being used for NFS service (wsync mount option).
796 if (!(mp
->m_flags
& XFS_MOUNT_DFLT_IOSIZE
)) {
797 if (mp
->m_flags
& XFS_MOUNT_WSYNC
) {
798 readio_log
= XFS_WSYNC_READIO_LOG
;
799 writeio_log
= XFS_WSYNC_WRITEIO_LOG
;
801 readio_log
= XFS_READIO_LOG_LARGE
;
802 writeio_log
= XFS_WRITEIO_LOG_LARGE
;
805 readio_log
= mp
->m_readio_log
;
806 writeio_log
= mp
->m_writeio_log
;
810 * Set the number of readahead buffers to use based on
811 * physical memory size.
813 if (xfs_physmem
<= 4096) /* <= 16MB */
814 mp
->m_nreadaheads
= XFS_RW_NREADAHEAD_16MB
;
815 else if (xfs_physmem
<= 8192) /* <= 32MB */
816 mp
->m_nreadaheads
= XFS_RW_NREADAHEAD_32MB
;
818 mp
->m_nreadaheads
= XFS_RW_NREADAHEAD_K32
;
819 if (sbp
->sb_blocklog
> readio_log
) {
820 mp
->m_readio_log
= sbp
->sb_blocklog
;
822 mp
->m_readio_log
= readio_log
;
824 mp
->m_readio_blocks
= 1 << (mp
->m_readio_log
- sbp
->sb_blocklog
);
825 if (sbp
->sb_blocklog
> writeio_log
) {
826 mp
->m_writeio_log
= sbp
->sb_blocklog
;
828 mp
->m_writeio_log
= writeio_log
;
830 mp
->m_writeio_blocks
= 1 << (mp
->m_writeio_log
- sbp
->sb_blocklog
);
833 * Set the inode cluster size based on the physical memory
834 * size. This may still be overridden by the file system
835 * block size if it is larger than the chosen cluster size.
837 if (xfs_physmem
<= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
838 mp
->m_inode_cluster_size
= XFS_INODE_SMALL_CLUSTER_SIZE
;
840 mp
->m_inode_cluster_size
= XFS_INODE_BIG_CLUSTER_SIZE
;
843 * Set whether we're using inode alignment.
845 if (XFS_SB_VERSION_HASALIGN(&mp
->m_sb
) &&
846 mp
->m_sb
.sb_inoalignmt
>=
847 XFS_B_TO_FSBT(mp
, mp
->m_inode_cluster_size
))
848 mp
->m_inoalign_mask
= mp
->m_sb
.sb_inoalignmt
- 1;
850 mp
->m_inoalign_mask
= 0;
852 * If we are using stripe alignment, check whether
853 * the stripe unit is a multiple of the inode alignment
855 if (mp
->m_dalign
&& mp
->m_inoalign_mask
&&
856 !(mp
->m_dalign
& mp
->m_inoalign_mask
))
857 mp
->m_sinoalign
= mp
->m_dalign
;
861 * Check that the data (and log if separate) are an ok size.
863 d
= (xfs_daddr_t
)XFS_FSB_TO_BB(mp
, mp
->m_sb
.sb_dblocks
);
864 if (XFS_BB_TO_FSB(mp
, d
) != mp
->m_sb
.sb_dblocks
) {
865 cmn_err(CE_WARN
, "XFS: size check 1 failed");
866 error
= XFS_ERROR(E2BIG
);
869 error
= xfs_read_buf(mp
, mp
->m_ddev_targp
,
870 d
- XFS_FSS_TO_BB(mp
, 1),
871 XFS_FSS_TO_BB(mp
, 1), 0, &bp
);
875 cmn_err(CE_WARN
, "XFS: size check 2 failed");
876 if (error
== ENOSPC
) {
877 error
= XFS_ERROR(E2BIG
);
882 if (((mfsi_flags
& XFS_MFSI_CLIENT
) == 0) &&
883 mp
->m_logdev_targp
!= mp
->m_ddev_targp
) {
884 d
= (xfs_daddr_t
)XFS_FSB_TO_BB(mp
, mp
->m_sb
.sb_logblocks
);
885 if (XFS_BB_TO_FSB(mp
, d
) != mp
->m_sb
.sb_logblocks
) {
886 cmn_err(CE_WARN
, "XFS: size check 3 failed");
887 error
= XFS_ERROR(E2BIG
);
890 error
= xfs_read_buf(mp
, mp
->m_logdev_targp
,
891 d
- XFS_FSB_TO_BB(mp
, 1),
892 XFS_FSB_TO_BB(mp
, 1), 0, &bp
);
896 cmn_err(CE_WARN
, "XFS: size check 3 failed");
897 if (error
== ENOSPC
) {
898 error
= XFS_ERROR(E2BIG
);
905 * Initialize realtime fields in the mount structure
907 if ((error
= xfs_rtmount_init(mp
))) {
908 cmn_err(CE_WARN
, "XFS: RT mount failed");
913 * For client case we are done now
915 if (mfsi_flags
& XFS_MFSI_CLIENT
) {
920 * Copies the low order bits of the timestamp and the randomly
921 * set "sequence" number out of a UUID.
923 uuid_getnodeuniq(&sbp
->sb_uuid
, mp
->m_fixedfsid
);
926 * The vfs structure needs to have a file system independent
927 * way of checking for the invariant file system ID. Since it
928 * can't look at mount structures it has a pointer to the data
929 * in the mount structure.
931 * File systems that don't support user level file handles (i.e.
932 * all of them except for XFS) will leave vfs_altfsid as NULL.
934 vfsp
->vfs_altfsid
= (xfs_fsid_t
*)mp
->m_fixedfsid
;
935 mp
->m_dmevmask
= 0; /* not persistent; set after each mount */
938 * Select the right directory manager.
941 XFS_SB_VERSION_HASDIRV2(&mp
->m_sb
) ?
946 * Initialize directory manager's entries.
951 * Initialize the attribute manager's entries.
953 mp
->m_attr_magicpct
= (mp
->m_sb
.sb_blocksize
* 37) / 100;
956 * Initialize the precomputed transaction reservations values.
961 * Allocate and initialize the inode hash table for this
968 * Allocate and initialize the per-ag data.
970 init_rwsem(&mp
->m_peraglock
);
972 kmem_zalloc(sbp
->sb_agcount
* sizeof(xfs_perag_t
), KM_SLEEP
);
974 mp
->m_maxagi
= xfs_initialize_perag(vfsp
, mp
, sbp
->sb_agcount
);
977 * log's mount-time initialization. Perform 1st part recovery if needed
979 if (likely(sbp
->sb_logblocks
> 0)) { /* check for volume case */
980 error
= xfs_log_mount(mp
, mp
->m_logdev_targp
,
981 XFS_FSB_TO_DADDR(mp
, sbp
->sb_logstart
),
982 XFS_FSB_TO_BB(mp
, sbp
->sb_logblocks
));
984 cmn_err(CE_WARN
, "XFS: log mount failed");
987 } else { /* No log has been defined */
988 cmn_err(CE_WARN
, "XFS: no log defined");
989 XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW
, mp
);
990 error
= XFS_ERROR(EFSCORRUPTED
);
995 * Get and sanity-check the root inode.
996 * Save the pointer to it in the mount structure.
998 error
= xfs_iget(mp
, NULL
, sbp
->sb_rootino
, 0, XFS_ILOCK_EXCL
, &rip
, 0);
1000 cmn_err(CE_WARN
, "XFS: failed to read root inode");
1004 ASSERT(rip
!= NULL
);
1005 rvp
= XFS_ITOV(rip
);
1007 if (unlikely((rip
->i_d
.di_mode
& S_IFMT
) != S_IFDIR
)) {
1008 cmn_err(CE_WARN
, "XFS: corrupted root inode");
1009 prdev("Root inode %llu is not a directory",
1010 mp
->m_ddev_targp
, (unsigned long long)rip
->i_ino
);
1011 xfs_iunlock(rip
, XFS_ILOCK_EXCL
);
1012 XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW
,
1014 error
= XFS_ERROR(EFSCORRUPTED
);
1017 mp
->m_rootip
= rip
; /* save it */
1019 xfs_iunlock(rip
, XFS_ILOCK_EXCL
);
1022 * Initialize realtime inode pointers in the mount structure
1024 if ((error
= xfs_rtmount_inodes(mp
))) {
1026 * Free up the root inode.
1028 cmn_err(CE_WARN
, "XFS: failed to read RT inodes");
1033 * If fs is not mounted readonly, then update the superblock
1034 * unit and width changes.
1036 if (update_flags
&& !(vfsp
->vfs_flag
& VFS_RDONLY
))
1037 xfs_mount_log_sbunit(mp
, update_flags
);
1040 * Initialise the XFS quota management subsystem for this mount
1042 if ((error
= XFS_QM_INIT(mp
, "amount
, "aflags
)))
1046 * Finish recovering the file system. This part needed to be
1047 * delayed until after the root and real-time bitmap inodes
1048 * were consistently read in.
1050 error
= xfs_log_mount_finish(mp
, mfsi_flags
);
1052 cmn_err(CE_WARN
, "XFS: log mount finish failed");
1057 * Complete the quota initialisation, post-log-replay component.
1059 if ((error
= XFS_QM_MOUNT(mp
, quotamount
, quotaflags
, mfsi_flags
)))
1066 * Free up the root inode.
1070 xfs_log_unmount_dealloc(mp
);
1074 for (agno
= 0; agno
< sbp
->sb_agcount
; agno
++)
1075 if (mp
->m_perag
[agno
].pagb_list
)
1076 kmem_free(mp
->m_perag
[agno
].pagb_list
,
1077 sizeof(xfs_perag_busy_t
) * XFS_PAGB_NUM_SLOTS
);
1078 kmem_free(mp
->m_perag
, sbp
->sb_agcount
* sizeof(xfs_perag_t
));
1083 xfs_uuid_unmount(mp
);
1091 * This flushes out the inodes,dquots and the superblock, unmounts the
1092 * log and makes sure that incore structures are freed.
1095 xfs_unmountfs(xfs_mount_t
*mp
, struct cred
*cr
)
1097 struct vfs
*vfsp
= XFS_MTOVFS(mp
);
1098 #if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1104 XFS_QM_DQPURGEALL(mp
, XFS_QMOPT_QUOTALL
| XFS_QMOPT_UMOUNTING
);
1107 * Flush out the log synchronously so that we know for sure
1108 * that nothing is pinned. This is important because bflush()
1109 * will skip pinned buffers.
1111 xfs_log_force(mp
, (xfs_lsn_t
)0, XFS_LOG_FORCE
| XFS_LOG_SYNC
);
1113 xfs_binval(mp
->m_ddev_targp
);
1114 if (mp
->m_rtdev_targp
) {
1115 xfs_binval(mp
->m_rtdev_targp
);
1118 xfs_unmountfs_writesb(mp
);
1120 xfs_unmountfs_wait(mp
); /* wait for async bufs */
1122 xfs_log_unmount(mp
); /* Done! No more fs ops. */
1127 * All inodes from this mount point should be freed.
1129 ASSERT(mp
->m_inodes
== NULL
);
1131 xfs_unmountfs_close(mp
, cr
);
1132 if ((mp
->m_flags
& XFS_MOUNT_NOUUID
) == 0)
1133 xfs_uuid_unmount(mp
);
1135 #if defined(DEBUG) || defined(INDUCE_IO_ERROR)
1137 * clear all error tags on this filesystem
1139 memcpy(&fsid
, &vfsp
->vfs_fsid
, sizeof(int64_t));
1140 xfs_errortag_clearall_umount(fsid
, mp
->m_fsname
, 0);
1143 xfs_mount_free(mp
, 1);
1148 xfs_unmountfs_close(xfs_mount_t
*mp
, struct cred
*cr
)
1150 if (mp
->m_logdev_targp
!= mp
->m_ddev_targp
)
1151 xfs_free_buftarg(mp
->m_logdev_targp
, 1);
1152 if (mp
->m_rtdev_targp
)
1153 xfs_free_buftarg(mp
->m_rtdev_targp
, 1);
1154 xfs_free_buftarg(mp
->m_ddev_targp
, 0);
1158 xfs_unmountfs_wait(xfs_mount_t
*mp
)
1160 if (mp
->m_logdev_targp
!= mp
->m_ddev_targp
)
1161 xfs_wait_buftarg(mp
->m_logdev_targp
);
1162 if (mp
->m_rtdev_targp
)
1163 xfs_wait_buftarg(mp
->m_rtdev_targp
);
1164 xfs_wait_buftarg(mp
->m_ddev_targp
);
1168 xfs_unmountfs_writesb(xfs_mount_t
*mp
)
1175 * skip superblock write if fs is read-only, or
1176 * if we are doing a forced umount.
1178 sbp
= xfs_getsb(mp
, 0);
1179 if (!(XFS_MTOVFS(mp
)->vfs_flag
& VFS_RDONLY
||
1180 XFS_FORCED_SHUTDOWN(mp
))) {
1182 xfs_icsb_sync_counters(mp
);
1185 * mark shared-readonly if desired
1187 sb
= XFS_BUF_TO_SBP(sbp
);
1188 if (mp
->m_mk_sharedro
) {
1189 if (!(sb
->sb_flags
& XFS_SBF_READONLY
))
1190 sb
->sb_flags
|= XFS_SBF_READONLY
;
1191 if (!XFS_SB_VERSION_HASSHARED(sb
))
1192 XFS_SB_VERSION_ADDSHARED(sb
);
1193 xfs_fs_cmn_err(CE_NOTE
, mp
,
1194 "Unmounting, marking shared read-only");
1196 XFS_BUF_UNDONE(sbp
);
1197 XFS_BUF_UNREAD(sbp
);
1198 XFS_BUF_UNDELAYWRITE(sbp
);
1200 XFS_BUF_UNASYNC(sbp
);
1201 ASSERT(XFS_BUF_TARGET(sbp
) == mp
->m_ddev_targp
);
1202 xfsbdstrat(mp
, sbp
);
1203 /* Nevermind errors we might get here. */
1204 error
= xfs_iowait(sbp
);
1206 xfs_ioerror_alert("xfs_unmountfs_writesb",
1207 mp
, sbp
, XFS_BUF_ADDR(sbp
));
1208 if (error
&& mp
->m_mk_sharedro
)
1209 xfs_fs_cmn_err(CE_ALERT
, mp
, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
1216 * xfs_mod_sb() can be used to copy arbitrary changes to the
1217 * in-core superblock into the superblock buffer to be logged.
1218 * It does not provide the higher level of locking that is
1219 * needed to protect the in-core superblock from concurrent
1223 xfs_mod_sb(xfs_trans_t
*tp
, __int64_t fields
)
1236 bp
= xfs_trans_getsb(tp
, mp
, 0);
1237 sbp
= XFS_BUF_TO_SBP(bp
);
1238 first
= sizeof(xfs_sb_t
);
1241 /* translate/copy */
1243 xfs_xlatesb(XFS_BUF_PTR(bp
), &(mp
->m_sb
), -1, fields
);
1245 /* find modified range */
1247 f
= (xfs_sb_field_t
)xfs_lowbit64((__uint64_t
)fields
);
1248 ASSERT((1LL << f
) & XFS_SB_MOD_BITS
);
1249 first
= xfs_sb_info
[f
].offset
;
1251 f
= (xfs_sb_field_t
)xfs_highbit64((__uint64_t
)fields
);
1252 ASSERT((1LL << f
) & XFS_SB_MOD_BITS
);
1253 last
= xfs_sb_info
[f
+ 1].offset
- 1;
1255 xfs_trans_log_buf(tp
, bp
, first
, last
);
1258 * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
1259 * a delta to a specified field in the in-core superblock. Simply
1260 * switch on the field indicated and apply the delta to that field.
1261 * Fields are not allowed to dip below zero, so if the delta would
1262 * do this do not apply it and return EINVAL.
1264 * The SB_LOCK must be held when this routine is called.
1267 xfs_mod_incore_sb_unlocked(xfs_mount_t
*mp
, xfs_sb_field_t field
,
1268 int delta
, int rsvd
)
1270 int scounter
; /* short counter for 32 bit fields */
1271 long long lcounter
; /* long counter for 64 bit fields */
1272 long long res_used
, rem
;
1275 * With the in-core superblock spin lock held, switch
1276 * on the indicated field. Apply the delta to the
1277 * proper field. If the fields value would dip below
1278 * 0, then do not apply the delta and return EINVAL.
1281 case XFS_SBS_ICOUNT
:
1282 lcounter
= (long long)mp
->m_sb
.sb_icount
;
1286 return XFS_ERROR(EINVAL
);
1288 mp
->m_sb
.sb_icount
= lcounter
;
1291 lcounter
= (long long)mp
->m_sb
.sb_ifree
;
1295 return XFS_ERROR(EINVAL
);
1297 mp
->m_sb
.sb_ifree
= lcounter
;
1299 case XFS_SBS_FDBLOCKS
:
1301 lcounter
= (long long)mp
->m_sb
.sb_fdblocks
;
1302 res_used
= (long long)(mp
->m_resblks
- mp
->m_resblks_avail
);
1304 if (delta
> 0) { /* Putting blocks back */
1305 if (res_used
> delta
) {
1306 mp
->m_resblks_avail
+= delta
;
1308 rem
= delta
- res_used
;
1309 mp
->m_resblks_avail
= mp
->m_resblks
;
1312 } else { /* Taking blocks away */
1317 * If were out of blocks, use any available reserved blocks if
1323 lcounter
= (long long)mp
->m_resblks_avail
+ delta
;
1325 return XFS_ERROR(ENOSPC
);
1327 mp
->m_resblks_avail
= lcounter
;
1329 } else { /* not reserved */
1330 return XFS_ERROR(ENOSPC
);
1335 mp
->m_sb
.sb_fdblocks
= lcounter
;
1337 case XFS_SBS_FREXTENTS
:
1338 lcounter
= (long long)mp
->m_sb
.sb_frextents
;
1341 return XFS_ERROR(ENOSPC
);
1343 mp
->m_sb
.sb_frextents
= lcounter
;
1345 case XFS_SBS_DBLOCKS
:
1346 lcounter
= (long long)mp
->m_sb
.sb_dblocks
;
1350 return XFS_ERROR(EINVAL
);
1352 mp
->m_sb
.sb_dblocks
= lcounter
;
1354 case XFS_SBS_AGCOUNT
:
1355 scounter
= mp
->m_sb
.sb_agcount
;
1359 return XFS_ERROR(EINVAL
);
1361 mp
->m_sb
.sb_agcount
= scounter
;
1363 case XFS_SBS_IMAX_PCT
:
1364 scounter
= mp
->m_sb
.sb_imax_pct
;
1368 return XFS_ERROR(EINVAL
);
1370 mp
->m_sb
.sb_imax_pct
= scounter
;
1372 case XFS_SBS_REXTSIZE
:
1373 scounter
= mp
->m_sb
.sb_rextsize
;
1377 return XFS_ERROR(EINVAL
);
1379 mp
->m_sb
.sb_rextsize
= scounter
;
1381 case XFS_SBS_RBMBLOCKS
:
1382 scounter
= mp
->m_sb
.sb_rbmblocks
;
1386 return XFS_ERROR(EINVAL
);
1388 mp
->m_sb
.sb_rbmblocks
= scounter
;
1390 case XFS_SBS_RBLOCKS
:
1391 lcounter
= (long long)mp
->m_sb
.sb_rblocks
;
1395 return XFS_ERROR(EINVAL
);
1397 mp
->m_sb
.sb_rblocks
= lcounter
;
1399 case XFS_SBS_REXTENTS
:
1400 lcounter
= (long long)mp
->m_sb
.sb_rextents
;
1404 return XFS_ERROR(EINVAL
);
1406 mp
->m_sb
.sb_rextents
= lcounter
;
1408 case XFS_SBS_REXTSLOG
:
1409 scounter
= mp
->m_sb
.sb_rextslog
;
1413 return XFS_ERROR(EINVAL
);
1415 mp
->m_sb
.sb_rextslog
= scounter
;
1419 return XFS_ERROR(EINVAL
);
1424 * xfs_mod_incore_sb() is used to change a field in the in-core
1425 * superblock structure by the specified delta. This modification
1426 * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
1427 * routine to do the work.
1430 xfs_mod_incore_sb(xfs_mount_t
*mp
, xfs_sb_field_t field
, int delta
, int rsvd
)
1435 /* check for per-cpu counters */
1437 #ifdef HAVE_PERCPU_SB
1438 case XFS_SBS_ICOUNT
:
1440 case XFS_SBS_FDBLOCKS
:
1441 if (!(mp
->m_flags
& XFS_MOUNT_NO_PERCPU_SB
)) {
1442 status
= xfs_icsb_modify_counters(mp
, field
,
1449 s
= XFS_SB_LOCK(mp
);
1450 status
= xfs_mod_incore_sb_unlocked(mp
, field
, delta
, rsvd
);
1451 XFS_SB_UNLOCK(mp
, s
);
1459 * xfs_mod_incore_sb_batch() is used to change more than one field
1460 * in the in-core superblock structure at a time. This modification
1461 * is protected by a lock internal to this module. The fields and
1462 * changes to those fields are specified in the array of xfs_mod_sb
1463 * structures passed in.
1465 * Either all of the specified deltas will be applied or none of
1466 * them will. If any modified field dips below 0, then all modifications
1467 * will be backed out and EINVAL will be returned.
1470 xfs_mod_incore_sb_batch(xfs_mount_t
*mp
, xfs_mod_sb_t
*msb
, uint nmsb
, int rsvd
)
1477 * Loop through the array of mod structures and apply each
1478 * individually. If any fail, then back out all those
1479 * which have already been applied. Do all of this within
1480 * the scope of the SB_LOCK so that all of the changes will
1483 s
= XFS_SB_LOCK(mp
);
1485 for (msbp
= &msbp
[0]; msbp
< (msb
+ nmsb
); msbp
++) {
1487 * Apply the delta at index n. If it fails, break
1488 * from the loop so we'll fall into the undo loop
1491 switch (msbp
->msb_field
) {
1492 #ifdef HAVE_PERCPU_SB
1493 case XFS_SBS_ICOUNT
:
1495 case XFS_SBS_FDBLOCKS
:
1496 if (!(mp
->m_flags
& XFS_MOUNT_NO_PERCPU_SB
)) {
1497 status
= xfs_icsb_modify_counters_locked(mp
,
1499 msbp
->msb_delta
, rsvd
);
1505 status
= xfs_mod_incore_sb_unlocked(mp
,
1507 msbp
->msb_delta
, rsvd
);
1517 * If we didn't complete the loop above, then back out
1518 * any changes made to the superblock. If you add code
1519 * between the loop above and here, make sure that you
1520 * preserve the value of status. Loop back until
1521 * we step below the beginning of the array. Make sure
1522 * we don't touch anything back there.
1526 while (msbp
>= msb
) {
1527 switch (msbp
->msb_field
) {
1528 #ifdef HAVE_PERCPU_SB
1529 case XFS_SBS_ICOUNT
:
1531 case XFS_SBS_FDBLOCKS
:
1532 if (!(mp
->m_flags
& XFS_MOUNT_NO_PERCPU_SB
)) {
1534 xfs_icsb_modify_counters_locked(mp
,
1543 status
= xfs_mod_incore_sb_unlocked(mp
,
1549 ASSERT(status
== 0);
1553 XFS_SB_UNLOCK(mp
, s
);
1558 * xfs_getsb() is called to obtain the buffer for the superblock.
1559 * The buffer is returned locked and read in from disk.
1560 * The buffer should be released with a call to xfs_brelse().
1562 * If the flags parameter is BUF_TRYLOCK, then we'll only return
1563 * the superblock buffer if it can be locked without sleeping.
1564 * If it can't then we'll return NULL.
1573 ASSERT(mp
->m_sb_bp
!= NULL
);
1575 if (flags
& XFS_BUF_TRYLOCK
) {
1576 if (!XFS_BUF_CPSEMA(bp
)) {
1580 XFS_BUF_PSEMA(bp
, PRIBIO
);
1583 ASSERT(XFS_BUF_ISDONE(bp
));
1588 * Used to free the superblock along various error paths.
1597 * Use xfs_getsb() so that the buffer will be locked
1598 * when we call xfs_buf_relse().
1600 bp
= xfs_getsb(mp
, 0);
1601 XFS_BUF_UNMANAGE(bp
);
1607 * See if the UUID is unique among mounted XFS filesystems.
1608 * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
1614 if (uuid_is_nil(&mp
->m_sb
.sb_uuid
)) {
1616 "XFS: Filesystem %s has nil UUID - can't mount",
1620 if (!uuid_table_insert(&mp
->m_sb
.sb_uuid
)) {
1622 "XFS: Filesystem %s has duplicate UUID - can't mount",
1630 * Remove filesystem from the UUID table.
1636 uuid_table_remove(&mp
->m_sb
.sb_uuid
);
1640 * Used to log changes to the superblock unit and width fields which could
1641 * be altered by the mount options. Only the first superblock is updated.
1644 xfs_mount_log_sbunit(
1650 ASSERT(fields
& (XFS_SB_UNIT
|XFS_SB_WIDTH
|XFS_SB_UUID
));
1652 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SB_UNIT
);
1653 if (xfs_trans_reserve(tp
, 0, mp
->m_sb
.sb_sectsize
+ 128, 0, 0,
1654 XFS_DEFAULT_LOG_COUNT
)) {
1655 xfs_trans_cancel(tp
, 0);
1658 xfs_mod_sb(tp
, fields
);
1659 xfs_trans_commit(tp
, 0, NULL
);
1663 #ifdef HAVE_PERCPU_SB
1665 * Per-cpu incore superblock counters
1667 * Simple concept, difficult implementation
1669 * Basically, replace the incore superblock counters with a distributed per cpu
1670 * counter for contended fields (e.g. free block count).
1672 * Difficulties arise in that the incore sb is used for ENOSPC checking, and
1673 * hence needs to be accurately read when we are running low on space. Hence
1674 * there is a method to enable and disable the per-cpu counters based on how
1675 * much "stuff" is available in them.
1677 * Basically, a counter is enabled if there is enough free resource to justify
1678 * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local
1679 * ENOSPC), then we disable the counters to synchronise all callers and
1680 * re-distribute the available resources.
1682 * If, once we redistributed the available resources, we still get a failure,
1683 * we disable the per-cpu counter and go through the slow path.
1685 * The slow path is the current xfs_mod_incore_sb() function. This means that
1686 * when we disable a per-cpu counter, we need to drain it's resources back to
1687 * the global superblock. We do this after disabling the counter to prevent
1688 * more threads from queueing up on the counter.
1690 * Essentially, this means that we still need a lock in the fast path to enable
1691 * synchronisation between the global counters and the per-cpu counters. This
1692 * is not a problem because the lock will be local to a CPU almost all the time
1693 * and have little contention except when we get to ENOSPC conditions.
1695 * Basically, this lock becomes a barrier that enables us to lock out the fast
1696 * path while we do things like enabling and disabling counters and
1697 * synchronising the counters.
1701 * 1. XFS_SB_LOCK() before picking up per-cpu locks
1702 * 2. per-cpu locks always picked up via for_each_online_cpu() order
1703 * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks
1704 * 4. modifying per-cpu counters requires holding per-cpu lock
1705 * 5. modifying global counters requires holding XFS_SB_LOCK
1706 * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK
1707 * and _none_ of the per-cpu locks.
1709 * Disabled counters are only ever re-enabled by a balance operation
1710 * that results in more free resources per CPU than a given threshold.
1711 * To ensure counters don't remain disabled, they are rebalanced when
1712 * the global resource goes above a higher threshold (i.e. some hysteresis
1713 * is present to prevent thrashing).
1717 * hot-plug CPU notifier support.
1719 * We cannot use the hotcpu_register() function because it does
1720 * not allow notifier instances. We need a notifier per filesystem
1721 * as we need to be able to identify the filesystem to balance
1722 * the counters out. This is achieved by having a notifier block
1723 * embedded in the xfs_mount_t and doing pointer magic to get the
1724 * mount pointer from the notifier block address.
1727 xfs_icsb_cpu_notify(
1728 struct notifier_block
*nfb
,
1729 unsigned long action
,
1732 xfs_icsb_cnts_t
*cntp
;
1736 mp
= (xfs_mount_t
*)container_of(nfb
, xfs_mount_t
, m_icsb_notifier
);
1737 cntp
= (xfs_icsb_cnts_t
*)
1738 per_cpu_ptr(mp
->m_sb_cnts
, (unsigned long)hcpu
);
1740 case CPU_UP_PREPARE
:
1741 /* Easy Case - initialize the area and locks, and
1742 * then rebalance when online does everything else for us. */
1743 memset(cntp
, 0, sizeof(xfs_icsb_cnts_t
));
1746 xfs_icsb_balance_counter(mp
, XFS_SBS_ICOUNT
, 0);
1747 xfs_icsb_balance_counter(mp
, XFS_SBS_IFREE
, 0);
1748 xfs_icsb_balance_counter(mp
, XFS_SBS_FDBLOCKS
, 0);
1751 /* Disable all the counters, then fold the dead cpu's
1752 * count into the total on the global superblock and
1753 * re-enable the counters. */
1754 s
= XFS_SB_LOCK(mp
);
1755 xfs_icsb_disable_counter(mp
, XFS_SBS_ICOUNT
);
1756 xfs_icsb_disable_counter(mp
, XFS_SBS_IFREE
);
1757 xfs_icsb_disable_counter(mp
, XFS_SBS_FDBLOCKS
);
1759 mp
->m_sb
.sb_icount
+= cntp
->icsb_icount
;
1760 mp
->m_sb
.sb_ifree
+= cntp
->icsb_ifree
;
1761 mp
->m_sb
.sb_fdblocks
+= cntp
->icsb_fdblocks
;
1763 memset(cntp
, 0, sizeof(xfs_icsb_cnts_t
));
1765 xfs_icsb_balance_counter(mp
, XFS_SBS_ICOUNT
, XFS_ICSB_SB_LOCKED
);
1766 xfs_icsb_balance_counter(mp
, XFS_SBS_IFREE
, XFS_ICSB_SB_LOCKED
);
1767 xfs_icsb_balance_counter(mp
, XFS_SBS_FDBLOCKS
, XFS_ICSB_SB_LOCKED
);
1768 XFS_SB_UNLOCK(mp
, s
);
1776 xfs_icsb_init_counters(
1779 xfs_icsb_cnts_t
*cntp
;
1782 mp
->m_sb_cnts
= alloc_percpu(xfs_icsb_cnts_t
);
1783 if (mp
->m_sb_cnts
== NULL
)
1786 mp
->m_icsb_notifier
.notifier_call
= xfs_icsb_cpu_notify
;
1787 mp
->m_icsb_notifier
.priority
= 0;
1788 register_cpu_notifier(&mp
->m_icsb_notifier
);
1790 for_each_online_cpu(i
) {
1791 cntp
= (xfs_icsb_cnts_t
*)per_cpu_ptr(mp
->m_sb_cnts
, i
);
1792 memset(cntp
, 0, sizeof(xfs_icsb_cnts_t
));
1795 * start with all counters disabled so that the
1796 * initial balance kicks us off correctly
1798 mp
->m_icsb_counters
= -1;
1803 xfs_icsb_destroy_counters(
1806 if (mp
->m_sb_cnts
) {
1807 unregister_cpu_notifier(&mp
->m_icsb_notifier
);
1808 free_percpu(mp
->m_sb_cnts
);
1814 xfs_icsb_cnts_t
*icsbp
)
1816 while (test_and_set_bit(XFS_ICSB_FLAG_LOCK
, &icsbp
->icsb_flags
)) {
1822 xfs_icsb_unlock_cntr(
1823 xfs_icsb_cnts_t
*icsbp
)
1825 clear_bit(XFS_ICSB_FLAG_LOCK
, &icsbp
->icsb_flags
);
1830 xfs_icsb_lock_all_counters(
1833 xfs_icsb_cnts_t
*cntp
;
1836 for_each_online_cpu(i
) {
1837 cntp
= (xfs_icsb_cnts_t
*)per_cpu_ptr(mp
->m_sb_cnts
, i
);
1838 xfs_icsb_lock_cntr(cntp
);
1843 xfs_icsb_unlock_all_counters(
1846 xfs_icsb_cnts_t
*cntp
;
1849 for_each_online_cpu(i
) {
1850 cntp
= (xfs_icsb_cnts_t
*)per_cpu_ptr(mp
->m_sb_cnts
, i
);
1851 xfs_icsb_unlock_cntr(cntp
);
1858 xfs_icsb_cnts_t
*cnt
,
1861 xfs_icsb_cnts_t
*cntp
;
1864 memset(cnt
, 0, sizeof(xfs_icsb_cnts_t
));
1866 if (!(flags
& XFS_ICSB_LAZY_COUNT
))
1867 xfs_icsb_lock_all_counters(mp
);
1869 for_each_online_cpu(i
) {
1870 cntp
= (xfs_icsb_cnts_t
*)per_cpu_ptr(mp
->m_sb_cnts
, i
);
1871 cnt
->icsb_icount
+= cntp
->icsb_icount
;
1872 cnt
->icsb_ifree
+= cntp
->icsb_ifree
;
1873 cnt
->icsb_fdblocks
+= cntp
->icsb_fdblocks
;
1876 if (!(flags
& XFS_ICSB_LAZY_COUNT
))
1877 xfs_icsb_unlock_all_counters(mp
);
1881 xfs_icsb_counter_disabled(
1883 xfs_sb_field_t field
)
1885 ASSERT((field
>= XFS_SBS_ICOUNT
) && (field
<= XFS_SBS_FDBLOCKS
));
1886 return test_bit(field
, &mp
->m_icsb_counters
);
1890 xfs_icsb_disable_counter(
1892 xfs_sb_field_t field
)
1894 xfs_icsb_cnts_t cnt
;
1896 ASSERT((field
>= XFS_SBS_ICOUNT
) && (field
<= XFS_SBS_FDBLOCKS
));
1898 xfs_icsb_lock_all_counters(mp
);
1899 if (!test_and_set_bit(field
, &mp
->m_icsb_counters
)) {
1900 /* drain back to superblock */
1902 xfs_icsb_count(mp
, &cnt
, XFS_ICSB_SB_LOCKED
|XFS_ICSB_LAZY_COUNT
);
1904 case XFS_SBS_ICOUNT
:
1905 mp
->m_sb
.sb_icount
= cnt
.icsb_icount
;
1908 mp
->m_sb
.sb_ifree
= cnt
.icsb_ifree
;
1910 case XFS_SBS_FDBLOCKS
:
1911 mp
->m_sb
.sb_fdblocks
= cnt
.icsb_fdblocks
;
1918 xfs_icsb_unlock_all_counters(mp
);
1924 xfs_icsb_enable_counter(
1926 xfs_sb_field_t field
,
1930 xfs_icsb_cnts_t
*cntp
;
1933 ASSERT((field
>= XFS_SBS_ICOUNT
) && (field
<= XFS_SBS_FDBLOCKS
));
1935 xfs_icsb_lock_all_counters(mp
);
1936 for_each_online_cpu(i
) {
1937 cntp
= per_cpu_ptr(mp
->m_sb_cnts
, i
);
1939 case XFS_SBS_ICOUNT
:
1940 cntp
->icsb_icount
= count
+ resid
;
1943 cntp
->icsb_ifree
= count
+ resid
;
1945 case XFS_SBS_FDBLOCKS
:
1946 cntp
->icsb_fdblocks
= count
+ resid
;
1954 clear_bit(field
, &mp
->m_icsb_counters
);
1955 xfs_icsb_unlock_all_counters(mp
);
1959 xfs_icsb_sync_counters_int(
1963 xfs_icsb_cnts_t cnt
;
1966 /* Pass 1: lock all counters */
1967 if ((flags
& XFS_ICSB_SB_LOCKED
) == 0)
1968 s
= XFS_SB_LOCK(mp
);
1970 xfs_icsb_count(mp
, &cnt
, flags
);
1972 /* Step 3: update mp->m_sb fields */
1973 if (!xfs_icsb_counter_disabled(mp
, XFS_SBS_ICOUNT
))
1974 mp
->m_sb
.sb_icount
= cnt
.icsb_icount
;
1975 if (!xfs_icsb_counter_disabled(mp
, XFS_SBS_IFREE
))
1976 mp
->m_sb
.sb_ifree
= cnt
.icsb_ifree
;
1977 if (!xfs_icsb_counter_disabled(mp
, XFS_SBS_FDBLOCKS
))
1978 mp
->m_sb
.sb_fdblocks
= cnt
.icsb_fdblocks
;
1980 if ((flags
& XFS_ICSB_SB_LOCKED
) == 0)
1981 XFS_SB_UNLOCK(mp
, s
);
1985 * Accurate update of per-cpu counters to incore superblock
1988 xfs_icsb_sync_counters(
1991 xfs_icsb_sync_counters_int(mp
, 0);
1995 * lazy addition used for things like df, background sb syncs, etc
1998 xfs_icsb_sync_counters_lazy(
2001 xfs_icsb_sync_counters_int(mp
, XFS_ICSB_LAZY_COUNT
);
2005 * Balance and enable/disable counters as necessary.
2007 * Thresholds for re-enabling counters are somewhat magic.
2008 * inode counts are chosen to be the same number as single
2009 * on disk allocation chunk per CPU, and free blocks is
2010 * something far enough zero that we aren't going thrash
2011 * when we get near ENOSPC.
2013 #define XFS_ICSB_INO_CNTR_REENABLE 64
2014 #define XFS_ICSB_FDBLK_CNTR_REENABLE 512
2016 xfs_icsb_balance_counter(
2018 xfs_sb_field_t field
,
2021 uint64_t count
, resid
= 0;
2022 int weight
= num_online_cpus();
2025 if (!(flags
& XFS_ICSB_SB_LOCKED
))
2026 s
= XFS_SB_LOCK(mp
);
2028 /* disable counter and sync counter */
2029 xfs_icsb_disable_counter(mp
, field
);
2031 /* update counters - first CPU gets residual*/
2033 case XFS_SBS_ICOUNT
:
2034 count
= mp
->m_sb
.sb_icount
;
2035 resid
= do_div(count
, weight
);
2036 if (count
< XFS_ICSB_INO_CNTR_REENABLE
)
2040 count
= mp
->m_sb
.sb_ifree
;
2041 resid
= do_div(count
, weight
);
2042 if (count
< XFS_ICSB_INO_CNTR_REENABLE
)
2045 case XFS_SBS_FDBLOCKS
:
2046 count
= mp
->m_sb
.sb_fdblocks
;
2047 resid
= do_div(count
, weight
);
2048 if (count
< XFS_ICSB_FDBLK_CNTR_REENABLE
)
2056 xfs_icsb_enable_counter(mp
, field
, count
, resid
);
2058 if (!(flags
& XFS_ICSB_SB_LOCKED
))
2059 XFS_SB_UNLOCK(mp
, s
);
2063 xfs_icsb_modify_counters_int(
2065 xfs_sb_field_t field
,
2070 xfs_icsb_cnts_t
*icsbp
;
2071 long long lcounter
; /* long counter for 64 bit fields */
2072 int cpu
, s
, locked
= 0;
2073 int ret
= 0, balance_done
= 0;
2077 icsbp
= (xfs_icsb_cnts_t
*)per_cpu_ptr(mp
->m_sb_cnts
, cpu
),
2078 xfs_icsb_lock_cntr(icsbp
);
2079 if (unlikely(xfs_icsb_counter_disabled(mp
, field
)))
2083 case XFS_SBS_ICOUNT
:
2084 lcounter
= icsbp
->icsb_icount
;
2086 if (unlikely(lcounter
< 0))
2088 icsbp
->icsb_icount
= lcounter
;
2092 lcounter
= icsbp
->icsb_ifree
;
2094 if (unlikely(lcounter
< 0))
2096 icsbp
->icsb_ifree
= lcounter
;
2099 case XFS_SBS_FDBLOCKS
:
2100 BUG_ON((mp
->m_resblks
- mp
->m_resblks_avail
) != 0);
2102 lcounter
= icsbp
->icsb_fdblocks
;
2104 if (unlikely(lcounter
< 0))
2106 icsbp
->icsb_fdblocks
= lcounter
;
2112 xfs_icsb_unlock_cntr(icsbp
);
2115 XFS_SB_UNLOCK(mp
, s
);
2119 * The slow path needs to be run with the SBLOCK
2120 * held so that we prevent other threads from
2121 * attempting to run this path at the same time.
2122 * this provides exclusion for the balancing code,
2123 * and exclusive fallback if the balance does not
2124 * provide enough resources to continue in an unlocked
2128 xfs_icsb_unlock_cntr(icsbp
);
2131 /* need to hold superblock incase we need
2132 * to disable a counter */
2133 if (!(flags
& XFS_ICSB_SB_LOCKED
)) {
2134 s
= XFS_SB_LOCK(mp
);
2136 flags
|= XFS_ICSB_SB_LOCKED
;
2138 if (!balance_done
) {
2139 xfs_icsb_balance_counter(mp
, field
, flags
);
2144 * we might not have enough on this local
2145 * cpu to allocate for a bulk request.
2146 * We need to drain this field from all CPUs
2147 * and disable the counter fastpath
2149 xfs_icsb_disable_counter(mp
, field
);
2152 ret
= xfs_mod_incore_sb_unlocked(mp
, field
, delta
, rsvd
);
2155 XFS_SB_UNLOCK(mp
, s
);
2160 xfs_icsb_modify_counters(
2162 xfs_sb_field_t field
,
2166 return xfs_icsb_modify_counters_int(mp
, field
, delta
, rsvd
, 0);
2170 * Called when superblock is already locked
2173 xfs_icsb_modify_counters_locked(
2175 xfs_sb_field_t field
,
2179 return xfs_icsb_modify_counters_int(mp
, field
, delta
,
2180 rsvd
, XFS_ICSB_SB_LOCKED
);