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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#ifndef __XFS_MOUNT_H__
7#define __XFS_MOUNT_H__
8
9struct xlog;
10struct xfs_inode;
11struct xfs_mru_cache;
12struct xfs_ail;
13struct xfs_quotainfo;
14struct xfs_da_geometry;
15struct xfs_perag;
16
17/* dynamic preallocation free space thresholds, 5% down to 1% */
18enum {
19 XFS_LOWSP_1_PCNT = 0,
20 XFS_LOWSP_2_PCNT,
21 XFS_LOWSP_3_PCNT,
22 XFS_LOWSP_4_PCNT,
23 XFS_LOWSP_5_PCNT,
24 XFS_LOWSP_MAX,
25};
26
27/*
28 * Error Configuration
29 *
30 * Error classes define the subsystem the configuration belongs to.
31 * Error numbers define the errors that are configurable.
32 */
33enum {
34 XFS_ERR_METADATA,
35 XFS_ERR_CLASS_MAX,
36};
37enum {
38 XFS_ERR_DEFAULT,
39 XFS_ERR_EIO,
40 XFS_ERR_ENOSPC,
41 XFS_ERR_ENODEV,
42 XFS_ERR_ERRNO_MAX,
43};
44
45#define XFS_ERR_RETRY_FOREVER -1
46
47/*
48 * Although retry_timeout is in jiffies which is normally an unsigned long,
49 * we limit the retry timeout to 86400 seconds, or one day. So even a
50 * signed 32-bit long is sufficient for a HZ value up to 24855. Making it
51 * signed lets us store the special "-1" value, meaning retry forever.
52 */
53struct xfs_error_cfg {
54 struct xfs_kobj kobj;
55 int max_retries;
56 long retry_timeout; /* in jiffies, -1 = infinite */
57};
58
59/*
60 * Per-cpu deferred inode inactivation GC lists.
61 */
62struct xfs_inodegc {
63 struct xfs_mount *mp;
64 struct llist_head list;
65 struct delayed_work work;
66 int error;
67
68 /* approximate count of inodes in the list */
69 unsigned int items;
70 unsigned int shrinker_hits;
71 unsigned int cpu;
72};
73
74/*
75 * The struct xfsmount layout is optimised to separate read-mostly variables
76 * from variables that are frequently modified. We put the read-mostly variables
77 * first, then place all the other variables at the end.
78 *
79 * Typically, read-mostly variables are those that are set at mount time and
80 * never changed again, or only change rarely as a result of things like sysfs
81 * knobs being tweaked.
82 */
83typedef struct xfs_mount {
84 struct xfs_sb m_sb; /* copy of fs superblock */
85 struct super_block *m_super;
86 struct xfs_ail *m_ail; /* fs active log item list */
87 struct xfs_buf *m_sb_bp; /* buffer for superblock */
88 char *m_rtname; /* realtime device name */
89 char *m_logname; /* external log device name */
90 struct xfs_da_geometry *m_dir_geo; /* directory block geometry */
91 struct xfs_da_geometry *m_attr_geo; /* attribute block geometry */
92 struct xlog *m_log; /* log specific stuff */
93 struct xfs_inode *m_rbmip; /* pointer to bitmap inode */
94 struct xfs_inode *m_rsumip; /* pointer to summary inode */
95 struct xfs_inode *m_rootip; /* pointer to root directory */
96 struct xfs_quotainfo *m_quotainfo; /* disk quota information */
97 xfs_buftarg_t *m_ddev_targp; /* saves taking the address */
98 xfs_buftarg_t *m_logdev_targp;/* ptr to log device */
99 xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */
100 void __percpu *m_inodegc; /* percpu inodegc structures */
101
102 /*
103 * Optional cache of rt summary level per bitmap block with the
104 * invariant that m_rsum_cache[bbno] > the maximum i for which
105 * rsum[i][bbno] != 0, or 0 if rsum[i][bbno] == 0 for all i.
106 * Reads and writes are serialized by the rsumip inode lock.
107 */
108 uint8_t *m_rsum_cache;
109 struct xfs_mru_cache *m_filestream; /* per-mount filestream data */
110 struct workqueue_struct *m_buf_workqueue;
111 struct workqueue_struct *m_unwritten_workqueue;
112 struct workqueue_struct *m_reclaim_workqueue;
113 struct workqueue_struct *m_sync_workqueue;
114 struct workqueue_struct *m_blockgc_wq;
115 struct workqueue_struct *m_inodegc_wq;
116
117 int m_bsize; /* fs logical block size */
118 uint8_t m_blkbit_log; /* blocklog + NBBY */
119 uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
120 uint8_t m_agno_log; /* log #ag's */
121 uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
122 int8_t m_rtxblklog; /* log2 of rextsize, if possible */
123 uint m_blockmask; /* sb_blocksize-1 */
124 uint m_blockwsize; /* sb_blocksize in words */
125 uint m_blockwmask; /* blockwsize-1 */
126 uint m_alloc_mxr[2]; /* max alloc btree records */
127 uint m_alloc_mnr[2]; /* min alloc btree records */
128 uint m_bmap_dmxr[2]; /* max bmap btree records */
129 uint m_bmap_dmnr[2]; /* min bmap btree records */
130 uint m_rmap_mxr[2]; /* max rmap btree records */
131 uint m_rmap_mnr[2]; /* min rmap btree records */
132 uint m_refc_mxr[2]; /* max refc btree records */
133 uint m_refc_mnr[2]; /* min refc btree records */
134 uint m_alloc_maxlevels; /* max alloc btree levels */
135 uint m_bm_maxlevels[2]; /* max bmap btree levels */
136 uint m_rmap_maxlevels; /* max rmap btree levels */
137 uint m_refc_maxlevels; /* max refcount btree level */
138 unsigned int m_agbtree_maxlevels; /* max level of all AG btrees */
139 xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */
140 uint m_alloc_set_aside; /* space we can't use */
141 uint m_ag_max_usable; /* max space per AG */
142 int m_dalign; /* stripe unit */
143 int m_swidth; /* stripe width */
144 xfs_agnumber_t m_maxagi; /* highest inode alloc group */
145 uint m_allocsize_log;/* min write size log bytes */
146 uint m_allocsize_blocks; /* min write size blocks */
147 int m_logbufs; /* number of log buffers */
148 int m_logbsize; /* size of each log buffer */
149 uint m_rsumlevels; /* rt summary levels */
150 uint m_rsumsize; /* size of rt summary, bytes */
151 int m_fixedfsid[2]; /* unchanged for life of FS */
152 uint m_qflags; /* quota status flags */
153 uint64_t m_features; /* active filesystem features */
154 uint64_t m_low_space[XFS_LOWSP_MAX];
155 uint64_t m_low_rtexts[XFS_LOWSP_MAX];
156 uint64_t m_rtxblkmask; /* rt extent block mask */
157 struct xfs_ino_geometry m_ino_geo; /* inode geometry */
158 struct xfs_trans_resv m_resv; /* precomputed res values */
159 /* low free space thresholds */
160 unsigned long m_opstate; /* dynamic state flags */
161 bool m_always_cow;
162 bool m_fail_unmount;
163 bool m_finobt_nores; /* no per-AG finobt resv. */
164 bool m_update_sb; /* sb needs update in mount */
165
166 /*
167 * Bitsets of per-fs metadata that have been checked and/or are sick.
168 * Callers must hold m_sb_lock to access these two fields.
169 */
170 uint8_t m_fs_checked;
171 uint8_t m_fs_sick;
172 /*
173 * Bitsets of rt metadata that have been checked and/or are sick.
174 * Callers must hold m_sb_lock to access this field.
175 */
176 uint8_t m_rt_checked;
177 uint8_t m_rt_sick;
178
179 /*
180 * End of read-mostly variables. Frequently written variables and locks
181 * should be placed below this comment from now on. The first variable
182 * here is marked as cacheline aligned so they it is separated from
183 * the read-mostly variables.
184 */
185
186 spinlock_t ____cacheline_aligned m_sb_lock; /* sb counter lock */
187 struct percpu_counter m_icount; /* allocated inodes counter */
188 struct percpu_counter m_ifree; /* free inodes counter */
189 struct percpu_counter m_fdblocks; /* free block counter */
190 struct percpu_counter m_frextents; /* free rt extent counter */
191
192 /*
193 * Count of data device blocks reserved for delayed allocations,
194 * including indlen blocks. Does not include allocated CoW staging
195 * extents or anything related to the rt device.
196 */
197 struct percpu_counter m_delalloc_blks;
198 /*
199 * Global count of allocation btree blocks in use across all AGs. Only
200 * used when perag reservation is enabled. Helps prevent block
201 * reservation from attempting to reserve allocation btree blocks.
202 */
203 atomic64_t m_allocbt_blks;
204
205 struct radix_tree_root m_perag_tree; /* per-ag accounting info */
206 spinlock_t m_perag_lock; /* lock for m_perag_tree */
207 uint64_t m_resblks; /* total reserved blocks */
208 uint64_t m_resblks_avail;/* available reserved blocks */
209 uint64_t m_resblks_save; /* reserved blks @ remount,ro */
210 struct delayed_work m_reclaim_work; /* background inode reclaim */
211 struct dentry *m_debugfs; /* debugfs parent */
212 struct xfs_kobj m_kobj;
213 struct xfs_kobj m_error_kobj;
214 struct xfs_kobj m_error_meta_kobj;
215 struct xfs_error_cfg m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
216 struct xstats m_stats; /* per-fs stats */
217#ifdef CONFIG_XFS_ONLINE_SCRUB_STATS
218 struct xchk_stats *m_scrub_stats;
219#endif
220 xfs_agnumber_t m_agfrotor; /* last ag where space found */
221 atomic_t m_agirotor; /* last ag dir inode alloced */
222
223 /* Memory shrinker to throttle and reprioritize inodegc */
224 struct shrinker *m_inodegc_shrinker;
225 /*
226 * Workqueue item so that we can coalesce multiple inode flush attempts
227 * into a single flush.
228 */
229 struct work_struct m_flush_inodes_work;
230
231 /*
232 * Generation of the filesysyem layout. This is incremented by each
233 * growfs, and used by the pNFS server to ensure the client updates
234 * its view of the block device once it gets a layout that might
235 * reference the newly added blocks. Does not need to be persistent
236 * as long as we only allow file system size increments, but if we
237 * ever support shrinks it would have to be persisted in addition
238 * to various other kinds of pain inflicted on the pNFS server.
239 */
240 uint32_t m_generation;
241 struct mutex m_growlock; /* growfs mutex */
242
243#ifdef DEBUG
244 /*
245 * Frequency with which errors are injected. Replaces xfs_etest; the
246 * value stored in here is the inverse of the frequency with which the
247 * error triggers. 1 = always, 2 = half the time, etc.
248 */
249 unsigned int *m_errortag;
250 struct xfs_kobj m_errortag_kobj;
251#endif
252
253 /* cpus that have inodes queued for inactivation */
254 struct cpumask m_inodegc_cpumask;
255} xfs_mount_t;
256
257#define M_IGEO(mp) (&(mp)->m_ino_geo)
258
259/*
260 * Flags for m_features.
261 *
262 * These are all the active features in the filesystem, regardless of how
263 * they are configured.
264 */
265#define XFS_FEAT_ATTR (1ULL << 0) /* xattrs present in fs */
266#define XFS_FEAT_NLINK (1ULL << 1) /* 32 bit link counts */
267#define XFS_FEAT_QUOTA (1ULL << 2) /* quota active */
268#define XFS_FEAT_ALIGN (1ULL << 3) /* inode alignment */
269#define XFS_FEAT_DALIGN (1ULL << 4) /* data alignment */
270#define XFS_FEAT_LOGV2 (1ULL << 5) /* version 2 logs */
271#define XFS_FEAT_SECTOR (1ULL << 6) /* sector size > 512 bytes */
272#define XFS_FEAT_EXTFLG (1ULL << 7) /* unwritten extents */
273#define XFS_FEAT_ASCIICI (1ULL << 8) /* ASCII only case-insens. */
274#define XFS_FEAT_LAZYSBCOUNT (1ULL << 9) /* Superblk counters */
275#define XFS_FEAT_ATTR2 (1ULL << 10) /* dynamic attr fork */
276#define XFS_FEAT_PARENT (1ULL << 11) /* parent pointers */
277#define XFS_FEAT_PROJID32 (1ULL << 12) /* 32 bit project id */
278#define XFS_FEAT_CRC (1ULL << 13) /* metadata CRCs */
279#define XFS_FEAT_V3INODES (1ULL << 14) /* Version 3 inodes */
280#define XFS_FEAT_PQUOTINO (1ULL << 15) /* non-shared proj/grp quotas */
281#define XFS_FEAT_FTYPE (1ULL << 16) /* inode type in dir */
282#define XFS_FEAT_FINOBT (1ULL << 17) /* free inode btree */
283#define XFS_FEAT_RMAPBT (1ULL << 18) /* reverse map btree */
284#define XFS_FEAT_REFLINK (1ULL << 19) /* reflinked files */
285#define XFS_FEAT_SPINODES (1ULL << 20) /* sparse inode chunks */
286#define XFS_FEAT_META_UUID (1ULL << 21) /* metadata UUID */
287#define XFS_FEAT_REALTIME (1ULL << 22) /* realtime device present */
288#define XFS_FEAT_INOBTCNT (1ULL << 23) /* inobt block counts */
289#define XFS_FEAT_BIGTIME (1ULL << 24) /* large timestamps */
290#define XFS_FEAT_NEEDSREPAIR (1ULL << 25) /* needs xfs_repair */
291#define XFS_FEAT_NREXT64 (1ULL << 26) /* large extent counters */
292
293/* Mount features */
294#define XFS_FEAT_NOATTR2 (1ULL << 48) /* disable attr2 creation */
295#define XFS_FEAT_NOALIGN (1ULL << 49) /* ignore alignment */
296#define XFS_FEAT_ALLOCSIZE (1ULL << 50) /* user specified allocation size */
297#define XFS_FEAT_LARGE_IOSIZE (1ULL << 51) /* report large preferred
298 * I/O size in stat() */
299#define XFS_FEAT_WSYNC (1ULL << 52) /* synchronous metadata ops */
300#define XFS_FEAT_DIRSYNC (1ULL << 53) /* synchronous directory ops */
301#define XFS_FEAT_DISCARD (1ULL << 54) /* discard unused blocks */
302#define XFS_FEAT_GRPID (1ULL << 55) /* group-ID assigned from directory */
303#define XFS_FEAT_SMALL_INUMS (1ULL << 56) /* user wants 32bit inodes */
304#define XFS_FEAT_IKEEP (1ULL << 57) /* keep empty inode clusters*/
305#define XFS_FEAT_SWALLOC (1ULL << 58) /* stripe width allocation */
306#define XFS_FEAT_FILESTREAMS (1ULL << 59) /* use filestreams allocator */
307#define XFS_FEAT_DAX_ALWAYS (1ULL << 60) /* DAX always enabled */
308#define XFS_FEAT_DAX_NEVER (1ULL << 61) /* DAX never enabled */
309#define XFS_FEAT_NORECOVERY (1ULL << 62) /* no recovery - dirty fs */
310#define XFS_FEAT_NOUUID (1ULL << 63) /* ignore uuid during mount */
311
312#define __XFS_HAS_FEAT(name, NAME) \
313static inline bool xfs_has_ ## name (struct xfs_mount *mp) \
314{ \
315 return mp->m_features & XFS_FEAT_ ## NAME; \
316}
317
318/* Some features can be added dynamically so they need a set wrapper, too. */
319#define __XFS_ADD_FEAT(name, NAME) \
320 __XFS_HAS_FEAT(name, NAME); \
321static inline void xfs_add_ ## name (struct xfs_mount *mp) \
322{ \
323 mp->m_features |= XFS_FEAT_ ## NAME; \
324 xfs_sb_version_add ## name(&mp->m_sb); \
325}
326
327/* Superblock features */
328__XFS_ADD_FEAT(attr, ATTR)
329__XFS_HAS_FEAT(nlink, NLINK)
330__XFS_ADD_FEAT(quota, QUOTA)
331__XFS_HAS_FEAT(align, ALIGN)
332__XFS_HAS_FEAT(dalign, DALIGN)
333__XFS_HAS_FEAT(logv2, LOGV2)
334__XFS_HAS_FEAT(sector, SECTOR)
335__XFS_HAS_FEAT(extflg, EXTFLG)
336__XFS_HAS_FEAT(asciici, ASCIICI)
337__XFS_HAS_FEAT(lazysbcount, LAZYSBCOUNT)
338__XFS_ADD_FEAT(attr2, ATTR2)
339__XFS_HAS_FEAT(parent, PARENT)
340__XFS_ADD_FEAT(projid32, PROJID32)
341__XFS_HAS_FEAT(crc, CRC)
342__XFS_HAS_FEAT(v3inodes, V3INODES)
343__XFS_HAS_FEAT(pquotino, PQUOTINO)
344__XFS_HAS_FEAT(ftype, FTYPE)
345__XFS_HAS_FEAT(finobt, FINOBT)
346__XFS_HAS_FEAT(rmapbt, RMAPBT)
347__XFS_HAS_FEAT(reflink, REFLINK)
348__XFS_HAS_FEAT(sparseinodes, SPINODES)
349__XFS_HAS_FEAT(metauuid, META_UUID)
350__XFS_HAS_FEAT(realtime, REALTIME)
351__XFS_HAS_FEAT(inobtcounts, INOBTCNT)
352__XFS_HAS_FEAT(bigtime, BIGTIME)
353__XFS_HAS_FEAT(needsrepair, NEEDSREPAIR)
354__XFS_HAS_FEAT(large_extent_counts, NREXT64)
355
356/*
357 * Mount features
358 *
359 * These do not change dynamically - features that can come and go, such as 32
360 * bit inodes and read-only state, are kept as operational state rather than
361 * features.
362 */
363__XFS_HAS_FEAT(noattr2, NOATTR2)
364__XFS_HAS_FEAT(noalign, NOALIGN)
365__XFS_HAS_FEAT(allocsize, ALLOCSIZE)
366__XFS_HAS_FEAT(large_iosize, LARGE_IOSIZE)
367__XFS_HAS_FEAT(wsync, WSYNC)
368__XFS_HAS_FEAT(dirsync, DIRSYNC)
369__XFS_HAS_FEAT(discard, DISCARD)
370__XFS_HAS_FEAT(grpid, GRPID)
371__XFS_HAS_FEAT(small_inums, SMALL_INUMS)
372__XFS_HAS_FEAT(ikeep, IKEEP)
373__XFS_HAS_FEAT(swalloc, SWALLOC)
374__XFS_HAS_FEAT(filestreams, FILESTREAMS)
375__XFS_HAS_FEAT(dax_always, DAX_ALWAYS)
376__XFS_HAS_FEAT(dax_never, DAX_NEVER)
377__XFS_HAS_FEAT(norecovery, NORECOVERY)
378__XFS_HAS_FEAT(nouuid, NOUUID)
379
380/*
381 * Operational mount state flags
382 *
383 * Use these with atomic bit ops only!
384 */
385#define XFS_OPSTATE_UNMOUNTING 0 /* filesystem is unmounting */
386#define XFS_OPSTATE_CLEAN 1 /* mount was clean */
387#define XFS_OPSTATE_SHUTDOWN 2 /* stop all fs operations */
388#define XFS_OPSTATE_INODE32 3 /* inode32 allocator active */
389#define XFS_OPSTATE_READONLY 4 /* read-only fs */
390
391/*
392 * If set, inactivation worker threads will be scheduled to process queued
393 * inodegc work. If not, queued inodes remain in memory waiting to be
394 * processed.
395 */
396#define XFS_OPSTATE_INODEGC_ENABLED 5
397/*
398 * If set, background speculative prealloc gc worker threads will be scheduled
399 * to process queued blockgc work. If not, inodes retain their preallocations
400 * until explicitly deleted.
401 */
402#define XFS_OPSTATE_BLOCKGC_ENABLED 6
403
404/* Kernel has logged a warning about online fsck being used on this fs. */
405#define XFS_OPSTATE_WARNED_SCRUB 7
406/* Kernel has logged a warning about shrink being used on this fs. */
407#define XFS_OPSTATE_WARNED_SHRINK 8
408/* Kernel has logged a warning about logged xattr updates being used. */
409#define XFS_OPSTATE_WARNED_LARP 9
410/* Mount time quotacheck is running */
411#define XFS_OPSTATE_QUOTACHECK_RUNNING 10
412
413#define __XFS_IS_OPSTATE(name, NAME) \
414static inline bool xfs_is_ ## name (struct xfs_mount *mp) \
415{ \
416 return test_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
417} \
418static inline bool xfs_clear_ ## name (struct xfs_mount *mp) \
419{ \
420 return test_and_clear_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
421} \
422static inline bool xfs_set_ ## name (struct xfs_mount *mp) \
423{ \
424 return test_and_set_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
425}
426
427__XFS_IS_OPSTATE(unmounting, UNMOUNTING)
428__XFS_IS_OPSTATE(clean, CLEAN)
429__XFS_IS_OPSTATE(shutdown, SHUTDOWN)
430__XFS_IS_OPSTATE(inode32, INODE32)
431__XFS_IS_OPSTATE(readonly, READONLY)
432__XFS_IS_OPSTATE(inodegc_enabled, INODEGC_ENABLED)
433__XFS_IS_OPSTATE(blockgc_enabled, BLOCKGC_ENABLED)
434#ifdef CONFIG_XFS_QUOTA
435__XFS_IS_OPSTATE(quotacheck_running, QUOTACHECK_RUNNING)
436#else
437# define xfs_is_quotacheck_running(mp) (false)
438#endif
439
440static inline bool
441xfs_should_warn(struct xfs_mount *mp, long nr)
442{
443 return !test_and_set_bit(nr, &mp->m_opstate);
444}
445
446#define XFS_OPSTATE_STRINGS \
447 { (1UL << XFS_OPSTATE_UNMOUNTING), "unmounting" }, \
448 { (1UL << XFS_OPSTATE_CLEAN), "clean" }, \
449 { (1UL << XFS_OPSTATE_SHUTDOWN), "shutdown" }, \
450 { (1UL << XFS_OPSTATE_INODE32), "inode32" }, \
451 { (1UL << XFS_OPSTATE_READONLY), "read_only" }, \
452 { (1UL << XFS_OPSTATE_INODEGC_ENABLED), "inodegc" }, \
453 { (1UL << XFS_OPSTATE_BLOCKGC_ENABLED), "blockgc" }, \
454 { (1UL << XFS_OPSTATE_WARNED_SCRUB), "wscrub" }, \
455 { (1UL << XFS_OPSTATE_WARNED_SHRINK), "wshrink" }, \
456 { (1UL << XFS_OPSTATE_WARNED_LARP), "wlarp" }, \
457 { (1UL << XFS_OPSTATE_QUOTACHECK_RUNNING), "quotacheck" }
458
459/*
460 * Max and min values for mount-option defined I/O
461 * preallocation sizes.
462 */
463#define XFS_MAX_IO_LOG 30 /* 1G */
464#define XFS_MIN_IO_LOG PAGE_SHIFT
465
466void xfs_do_force_shutdown(struct xfs_mount *mp, uint32_t flags, char *fname,
467 int lnnum);
468#define xfs_force_shutdown(m,f) \
469 xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
470
471#define SHUTDOWN_META_IO_ERROR (1u << 0) /* write attempt to metadata failed */
472#define SHUTDOWN_LOG_IO_ERROR (1u << 1) /* write attempt to the log failed */
473#define SHUTDOWN_FORCE_UMOUNT (1u << 2) /* shutdown from a forced unmount */
474#define SHUTDOWN_CORRUPT_INCORE (1u << 3) /* corrupt in-memory structures */
475#define SHUTDOWN_CORRUPT_ONDISK (1u << 4) /* corrupt metadata on device */
476#define SHUTDOWN_DEVICE_REMOVED (1u << 5) /* device removed underneath us */
477
478#define XFS_SHUTDOWN_STRINGS \
479 { SHUTDOWN_META_IO_ERROR, "metadata_io" }, \
480 { SHUTDOWN_LOG_IO_ERROR, "log_io" }, \
481 { SHUTDOWN_FORCE_UMOUNT, "force_umount" }, \
482 { SHUTDOWN_CORRUPT_INCORE, "corruption" }, \
483 { SHUTDOWN_DEVICE_REMOVED, "device_removed" }
484
485/*
486 * Flags for xfs_mountfs
487 */
488#define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
489
490static inline xfs_agnumber_t
491xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
492{
493 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
494 do_div(ld, mp->m_sb.sb_agblocks);
495 return (xfs_agnumber_t) ld;
496}
497
498static inline xfs_agblock_t
499xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
500{
501 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
502 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
503}
504
505int xfs_buf_hash_init(struct xfs_perag *pag);
506void xfs_buf_hash_destroy(struct xfs_perag *pag);
507
508extern void xfs_uuid_table_free(void);
509extern uint64_t xfs_default_resblks(xfs_mount_t *mp);
510extern int xfs_mountfs(xfs_mount_t *mp);
511extern void xfs_unmountfs(xfs_mount_t *);
512
513/*
514 * Deltas for the block count can vary from 1 to very large, but lock contention
515 * only occurs on frequent small block count updates such as in the delayed
516 * allocation path for buffered writes (page a time updates). Hence we set
517 * a large batch count (1024) to minimise global counter updates except when
518 * we get near to ENOSPC and we have to be very accurate with our updates.
519 */
520#define XFS_FDBLOCKS_BATCH 1024
521
522/*
523 * Estimate the amount of free space that is not available to userspace and is
524 * not explicitly reserved from the incore fdblocks. This includes:
525 *
526 * - The minimum number of blocks needed to support splitting a bmap btree
527 * - The blocks currently in use by the freespace btrees because they record
528 * the actual blocks that will fill per-AG metadata space reservations
529 */
530static inline uint64_t
531xfs_fdblocks_unavailable(
532 struct xfs_mount *mp)
533{
534 return mp->m_alloc_set_aside + atomic64_read(&mp->m_allocbt_blks);
535}
536
537int xfs_mod_freecounter(struct xfs_mount *mp, struct percpu_counter *counter,
538 int64_t delta, bool rsvd);
539
540static inline int
541xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta, bool reserved)
542{
543 return xfs_mod_freecounter(mp, &mp->m_fdblocks, delta, reserved);
544}
545
546static inline int
547xfs_mod_frextents(struct xfs_mount *mp, int64_t delta)
548{
549 return xfs_mod_freecounter(mp, &mp->m_frextents, delta, false);
550}
551
552extern int xfs_readsb(xfs_mount_t *, int);
553extern void xfs_freesb(xfs_mount_t *);
554extern bool xfs_fs_writable(struct xfs_mount *mp, int level);
555extern int xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t);
556
557extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
558
559extern void xfs_set_low_space_thresholds(struct xfs_mount *);
560
561int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
562 xfs_off_t count_fsb);
563
564struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
565 int error_class, int error);
566void xfs_force_summary_recalc(struct xfs_mount *mp);
567int xfs_add_incompat_log_feature(struct xfs_mount *mp, uint32_t feature);
568bool xfs_clear_incompat_log_features(struct xfs_mount *mp);
569void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta);
570
571#endif /* __XFS_MOUNT_H__ */
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#ifndef __XFS_MOUNT_H__
7#define __XFS_MOUNT_H__
8
9struct xlog;
10struct xfs_inode;
11struct xfs_mru_cache;
12struct xfs_nameops;
13struct xfs_ail;
14struct xfs_quotainfo;
15struct xfs_dir_ops;
16struct xfs_da_geometry;
17
18/* dynamic preallocation free space thresholds, 5% down to 1% */
19enum {
20 XFS_LOWSP_1_PCNT = 0,
21 XFS_LOWSP_2_PCNT,
22 XFS_LOWSP_3_PCNT,
23 XFS_LOWSP_4_PCNT,
24 XFS_LOWSP_5_PCNT,
25 XFS_LOWSP_MAX,
26};
27
28/*
29 * Error Configuration
30 *
31 * Error classes define the subsystem the configuration belongs to.
32 * Error numbers define the errors that are configurable.
33 */
34enum {
35 XFS_ERR_METADATA,
36 XFS_ERR_CLASS_MAX,
37};
38enum {
39 XFS_ERR_DEFAULT,
40 XFS_ERR_EIO,
41 XFS_ERR_ENOSPC,
42 XFS_ERR_ENODEV,
43 XFS_ERR_ERRNO_MAX,
44};
45
46#define XFS_ERR_RETRY_FOREVER -1
47
48/*
49 * Although retry_timeout is in jiffies which is normally an unsigned long,
50 * we limit the retry timeout to 86400 seconds, or one day. So even a
51 * signed 32-bit long is sufficient for a HZ value up to 24855. Making it
52 * signed lets us store the special "-1" value, meaning retry forever.
53 */
54struct xfs_error_cfg {
55 struct xfs_kobj kobj;
56 int max_retries;
57 long retry_timeout; /* in jiffies, -1 = infinite */
58};
59
60typedef struct xfs_mount {
61 struct super_block *m_super;
62 xfs_tid_t m_tid; /* next unused tid for fs */
63
64 /*
65 * Bitsets of per-fs metadata that have been checked and/or are sick.
66 * Callers must hold m_sb_lock to access these two fields.
67 */
68 uint8_t m_fs_checked;
69 uint8_t m_fs_sick;
70 /*
71 * Bitsets of rt metadata that have been checked and/or are sick.
72 * Callers must hold m_sb_lock to access this field.
73 */
74 uint8_t m_rt_checked;
75 uint8_t m_rt_sick;
76
77 struct xfs_ail *m_ail; /* fs active log item list */
78
79 struct xfs_sb m_sb; /* copy of fs superblock */
80 spinlock_t m_sb_lock; /* sb counter lock */
81 struct percpu_counter m_icount; /* allocated inodes counter */
82 struct percpu_counter m_ifree; /* free inodes counter */
83 struct percpu_counter m_fdblocks; /* free block counter */
84 /*
85 * Count of data device blocks reserved for delayed allocations,
86 * including indlen blocks. Does not include allocated CoW staging
87 * extents or anything related to the rt device.
88 */
89 struct percpu_counter m_delalloc_blks;
90
91 struct xfs_buf *m_sb_bp; /* buffer for superblock */
92 char *m_fsname; /* filesystem name */
93 int m_fsname_len; /* strlen of fs name */
94 char *m_rtname; /* realtime device name */
95 char *m_logname; /* external log device name */
96 int m_bsize; /* fs logical block size */
97 xfs_agnumber_t m_agfrotor; /* last ag where space found */
98 xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
99 spinlock_t m_agirotor_lock;/* .. and lock protecting it */
100 xfs_agnumber_t m_maxagi; /* highest inode alloc group */
101 uint m_readio_log; /* min read size log bytes */
102 uint m_readio_blocks; /* min read size blocks */
103 uint m_writeio_log; /* min write size log bytes */
104 uint m_writeio_blocks; /* min write size blocks */
105 struct xfs_da_geometry *m_dir_geo; /* directory block geometry */
106 struct xfs_da_geometry *m_attr_geo; /* attribute block geometry */
107 struct xlog *m_log; /* log specific stuff */
108 struct xfs_ino_geometry m_ino_geo; /* inode geometry */
109 int m_logbufs; /* number of log buffers */
110 int m_logbsize; /* size of each log buffer */
111 uint m_rsumlevels; /* rt summary levels */
112 uint m_rsumsize; /* size of rt summary, bytes */
113 /*
114 * Optional cache of rt summary level per bitmap block with the
115 * invariant that m_rsum_cache[bbno] <= the minimum i for which
116 * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
117 * inode lock.
118 */
119 uint8_t *m_rsum_cache;
120 struct xfs_inode *m_rbmip; /* pointer to bitmap inode */
121 struct xfs_inode *m_rsumip; /* pointer to summary inode */
122 struct xfs_inode *m_rootip; /* pointer to root directory */
123 struct xfs_quotainfo *m_quotainfo; /* disk quota information */
124 xfs_buftarg_t *m_ddev_targp; /* saves taking the address */
125 xfs_buftarg_t *m_logdev_targp;/* ptr to log device */
126 xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */
127 uint8_t m_blkbit_log; /* blocklog + NBBY */
128 uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
129 uint8_t m_agno_log; /* log #ag's */
130 uint m_blockmask; /* sb_blocksize-1 */
131 uint m_blockwsize; /* sb_blocksize in words */
132 uint m_blockwmask; /* blockwsize-1 */
133 uint m_alloc_mxr[2]; /* max alloc btree records */
134 uint m_alloc_mnr[2]; /* min alloc btree records */
135 uint m_bmap_dmxr[2]; /* max bmap btree records */
136 uint m_bmap_dmnr[2]; /* min bmap btree records */
137 uint m_rmap_mxr[2]; /* max rmap btree records */
138 uint m_rmap_mnr[2]; /* min rmap btree records */
139 uint m_refc_mxr[2]; /* max refc btree records */
140 uint m_refc_mnr[2]; /* min refc btree records */
141 uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
142 uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
143 uint m_rmap_maxlevels; /* max rmap btree levels */
144 uint m_refc_maxlevels; /* max refcount btree level */
145 xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */
146 uint m_alloc_set_aside; /* space we can't use */
147 uint m_ag_max_usable; /* max space per AG */
148 struct radix_tree_root m_perag_tree; /* per-ag accounting info */
149 spinlock_t m_perag_lock; /* lock for m_perag_tree */
150 struct mutex m_growlock; /* growfs mutex */
151 int m_fixedfsid[2]; /* unchanged for life of FS */
152 uint64_t m_flags; /* global mount flags */
153 bool m_finobt_nores; /* no per-AG finobt resv. */
154 uint m_qflags; /* quota status flags */
155 struct xfs_trans_resv m_resv; /* precomputed res values */
156 uint64_t m_resblks; /* total reserved blocks */
157 uint64_t m_resblks_avail;/* available reserved blocks */
158 uint64_t m_resblks_save; /* reserved blks @ remount,ro */
159 int m_dalign; /* stripe unit */
160 int m_swidth; /* stripe width */
161 uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
162 const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
163 const struct xfs_dir_ops *m_dir_inode_ops; /* vector of dir inode ops */
164 const struct xfs_dir_ops *m_nondir_inode_ops; /* !dir inode ops */
165 uint m_chsize; /* size of next field */
166 atomic_t m_active_trans; /* number trans frozen */
167 struct xfs_mru_cache *m_filestream; /* per-mount filestream data */
168 struct delayed_work m_reclaim_work; /* background inode reclaim */
169 struct delayed_work m_eofblocks_work; /* background eof blocks
170 trimming */
171 struct delayed_work m_cowblocks_work; /* background cow blocks
172 trimming */
173 bool m_update_sb; /* sb needs update in mount */
174 int64_t m_low_space[XFS_LOWSP_MAX];
175 /* low free space thresholds */
176 struct xfs_kobj m_kobj;
177 struct xfs_kobj m_error_kobj;
178 struct xfs_kobj m_error_meta_kobj;
179 struct xfs_error_cfg m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
180 struct xstats m_stats; /* per-fs stats */
181
182 struct workqueue_struct *m_buf_workqueue;
183 struct workqueue_struct *m_unwritten_workqueue;
184 struct workqueue_struct *m_cil_workqueue;
185 struct workqueue_struct *m_reclaim_workqueue;
186 struct workqueue_struct *m_eofblocks_workqueue;
187 struct workqueue_struct *m_sync_workqueue;
188
189 /*
190 * Generation of the filesysyem layout. This is incremented by each
191 * growfs, and used by the pNFS server to ensure the client updates
192 * its view of the block device once it gets a layout that might
193 * reference the newly added blocks. Does not need to be persistent
194 * as long as we only allow file system size increments, but if we
195 * ever support shrinks it would have to be persisted in addition
196 * to various other kinds of pain inflicted on the pNFS server.
197 */
198 uint32_t m_generation;
199
200 bool m_always_cow;
201 bool m_fail_unmount;
202#ifdef DEBUG
203 /*
204 * Frequency with which errors are injected. Replaces xfs_etest; the
205 * value stored in here is the inverse of the frequency with which the
206 * error triggers. 1 = always, 2 = half the time, etc.
207 */
208 unsigned int *m_errortag;
209 struct xfs_kobj m_errortag_kobj;
210#endif
211} xfs_mount_t;
212
213#define M_IGEO(mp) (&(mp)->m_ino_geo)
214
215/*
216 * Flags for m_flags.
217 */
218#define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
219 must be synchronous except
220 for space allocations */
221#define XFS_MOUNT_UNMOUNTING (1ULL << 1) /* filesystem is unmounting */
222#define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
223#define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
224 operations, typically for
225 disk errors in metadata */
226#define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */
227#define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
228 allocations */
229#define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
230#define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
231#define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
232#define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */
233#define XFS_MOUNT_SMALL_INUMS (1ULL << 14) /* user wants 32bit inodes */
234#define XFS_MOUNT_32BITINODES (1ULL << 15) /* inode32 allocator active */
235#define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
236#define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
237#define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
238 * allocation */
239#define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
240#define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
241#define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
242 * I/O size in stat() */
243#define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
244 allocator */
245#define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
246
247#define XFS_MOUNT_DAX (1ULL << 62) /* TEST ONLY! */
248
249
250/*
251 * Default minimum read and write sizes.
252 */
253#define XFS_READIO_LOG_LARGE 16
254#define XFS_WRITEIO_LOG_LARGE 16
255
256/*
257 * Max and min values for mount-option defined I/O
258 * preallocation sizes.
259 */
260#define XFS_MAX_IO_LOG 30 /* 1G */
261#define XFS_MIN_IO_LOG PAGE_SHIFT
262
263/*
264 * Synchronous read and write sizes. This should be
265 * better for NFSv2 wsync filesystems.
266 */
267#define XFS_WSYNC_READIO_LOG 15 /* 32k */
268#define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */
269
270/*
271 * Allow large block sizes to be reported to userspace programs if the
272 * "largeio" mount option is used.
273 *
274 * If compatibility mode is specified, simply return the basic unit of caching
275 * so that we don't get inefficient read/modify/write I/O from user apps.
276 * Otherwise....
277 *
278 * If the underlying volume is a stripe, then return the stripe width in bytes
279 * as the recommended I/O size. It is not a stripe and we've set a default
280 * buffered I/O size, return that, otherwise return the compat default.
281 */
282static inline unsigned long
283xfs_preferred_iosize(xfs_mount_t *mp)
284{
285 if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
286 return PAGE_SIZE;
287 return (mp->m_swidth ?
288 (mp->m_swidth << mp->m_sb.sb_blocklog) :
289 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
290 (1 << (int)max(mp->m_readio_log, mp->m_writeio_log)) :
291 PAGE_SIZE));
292}
293
294#define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
295 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
296#define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
297void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
298 int lnnum);
299#define xfs_force_shutdown(m,f) \
300 xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
301
302#define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
303#define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
304#define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
305#define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
306#define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */
307#define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */
308
309/*
310 * Flags for xfs_mountfs
311 */
312#define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
313
314static inline xfs_agnumber_t
315xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
316{
317 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
318 do_div(ld, mp->m_sb.sb_agblocks);
319 return (xfs_agnumber_t) ld;
320}
321
322static inline xfs_agblock_t
323xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
324{
325 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
326 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
327}
328
329/* per-AG block reservation data structures*/
330struct xfs_ag_resv {
331 /* number of blocks originally reserved here */
332 xfs_extlen_t ar_orig_reserved;
333 /* number of blocks reserved here */
334 xfs_extlen_t ar_reserved;
335 /* number of blocks originally asked for */
336 xfs_extlen_t ar_asked;
337};
338
339/*
340 * Per-ag incore structure, copies of information in agf and agi, to improve the
341 * performance of allocation group selection.
342 */
343typedef struct xfs_perag {
344 struct xfs_mount *pag_mount; /* owner filesystem */
345 xfs_agnumber_t pag_agno; /* AG this structure belongs to */
346 atomic_t pag_ref; /* perag reference count */
347 char pagf_init; /* this agf's entry is initialized */
348 char pagi_init; /* this agi's entry is initialized */
349 char pagf_metadata; /* the agf is preferred to be metadata */
350 char pagi_inodeok; /* The agi is ok for inodes */
351 uint8_t pagf_levels[XFS_BTNUM_AGF];
352 /* # of levels in bno & cnt btree */
353 bool pagf_agflreset; /* agfl requires reset before use */
354 uint32_t pagf_flcount; /* count of blocks in freelist */
355 xfs_extlen_t pagf_freeblks; /* total free blocks */
356 xfs_extlen_t pagf_longest; /* longest free space */
357 uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
358 xfs_agino_t pagi_freecount; /* number of free inodes */
359 xfs_agino_t pagi_count; /* number of allocated inodes */
360
361 /*
362 * Inode allocation search lookup optimisation.
363 * If the pagino matches, the search for new inodes
364 * doesn't need to search the near ones again straight away
365 */
366 xfs_agino_t pagl_pagino;
367 xfs_agino_t pagl_leftrec;
368 xfs_agino_t pagl_rightrec;
369
370 /*
371 * Bitsets of per-ag metadata that have been checked and/or are sick.
372 * Callers should hold pag_state_lock before accessing this field.
373 */
374 uint16_t pag_checked;
375 uint16_t pag_sick;
376 spinlock_t pag_state_lock;
377
378 spinlock_t pagb_lock; /* lock for pagb_tree */
379 struct rb_root pagb_tree; /* ordered tree of busy extents */
380 unsigned int pagb_gen; /* generation count for pagb_tree */
381 wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */
382
383 atomic_t pagf_fstrms; /* # of filestreams active in this AG */
384
385 spinlock_t pag_ici_lock; /* incore inode cache lock */
386 struct radix_tree_root pag_ici_root; /* incore inode cache root */
387 int pag_ici_reclaimable; /* reclaimable inodes */
388 struct mutex pag_ici_reclaim_lock; /* serialisation point */
389 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
390
391 /* buffer cache index */
392 spinlock_t pag_buf_lock; /* lock for pag_buf_hash */
393 struct rhashtable pag_buf_hash;
394
395 /* for rcu-safe freeing */
396 struct rcu_head rcu_head;
397 int pagb_count; /* pagb slots in use */
398
399 /* Blocks reserved for all kinds of metadata. */
400 struct xfs_ag_resv pag_meta_resv;
401 /* Blocks reserved for the reverse mapping btree. */
402 struct xfs_ag_resv pag_rmapbt_resv;
403
404 /* reference count */
405 uint8_t pagf_refcount_level;
406
407 /*
408 * Unlinked inode information. This incore information reflects
409 * data stored in the AGI, so callers must hold the AGI buffer lock
410 * or have some other means to control concurrency.
411 */
412 struct rhashtable pagi_unlinked_hash;
413} xfs_perag_t;
414
415static inline struct xfs_ag_resv *
416xfs_perag_resv(
417 struct xfs_perag *pag,
418 enum xfs_ag_resv_type type)
419{
420 switch (type) {
421 case XFS_AG_RESV_METADATA:
422 return &pag->pag_meta_resv;
423 case XFS_AG_RESV_RMAPBT:
424 return &pag->pag_rmapbt_resv;
425 default:
426 return NULL;
427 }
428}
429
430int xfs_buf_hash_init(xfs_perag_t *pag);
431void xfs_buf_hash_destroy(xfs_perag_t *pag);
432
433extern void xfs_uuid_table_free(void);
434extern int xfs_log_sbcount(xfs_mount_t *);
435extern uint64_t xfs_default_resblks(xfs_mount_t *mp);
436extern int xfs_mountfs(xfs_mount_t *mp);
437extern int xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
438 xfs_agnumber_t *maxagi);
439extern void xfs_unmountfs(xfs_mount_t *);
440
441extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
442extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
443extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
444 bool reserved);
445extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
446
447extern struct xfs_buf *xfs_getsb(xfs_mount_t *);
448extern int xfs_readsb(xfs_mount_t *, int);
449extern void xfs_freesb(xfs_mount_t *);
450extern bool xfs_fs_writable(struct xfs_mount *mp, int level);
451extern int xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t);
452
453extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
454
455extern void xfs_set_low_space_thresholds(struct xfs_mount *);
456
457int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
458 xfs_off_t count_fsb);
459
460struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
461 int error_class, int error);
462void xfs_force_summary_recalc(struct xfs_mount *mp);
463void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta);
464
465#endif /* __XFS_MOUNT_H__ */