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 9 struct xlog; 10 struct xfs_inode; 11 struct xfs_mru_cache; 12 struct xfs_ail; 13 struct xfs_quotainfo; 14 struct xfs_da_geometry; 15 struct xfs_perag; 16 17 /* dynamic preallocation free space thresholds, 5% down to 1% */ 18 enum { 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 */ 33 enum { 34 XFS_ERR_METADATA, 35 XFS_ERR_CLASS_MAX, 36 }; 37 enum { 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 */ 53 struct 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 */ 62 struct xfs_inodegc { 63 struct llist_head list; 64 struct work_struct work; 65 66 /* approximate count of inodes in the list */ 67 unsigned int items; 68 unsigned int shrinker_hits; 69 }; 70 71 /* 72 * The struct xfsmount layout is optimised to separate read-mostly variables 73 * from variables that are frequently modified. We put the read-mostly variables 74 * first, then place all the other variables at the end. 75 * 76 * Typically, read-mostly variables are those that are set at mount time and 77 * never changed again, or only change rarely as a result of things like sysfs 78 * knobs being tweaked. 79 */ 80 typedef struct xfs_mount { 81 struct xfs_sb m_sb; /* copy of fs superblock */ 82 struct super_block *m_super; 83 struct xfs_ail *m_ail; /* fs active log item list */ 84 struct xfs_buf *m_sb_bp; /* buffer for superblock */ 85 char *m_rtname; /* realtime device name */ 86 char *m_logname; /* external log device name */ 87 struct xfs_da_geometry *m_dir_geo; /* directory block geometry */ 88 struct xfs_da_geometry *m_attr_geo; /* attribute block geometry */ 89 struct xlog *m_log; /* log specific stuff */ 90 struct xfs_inode *m_rbmip; /* pointer to bitmap inode */ 91 struct xfs_inode *m_rsumip; /* pointer to summary inode */ 92 struct xfs_inode *m_rootip; /* pointer to root directory */ 93 struct xfs_quotainfo *m_quotainfo; /* disk quota information */ 94 xfs_buftarg_t *m_ddev_targp; /* saves taking the address */ 95 xfs_buftarg_t *m_logdev_targp;/* ptr to log device */ 96 xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */ 97 struct list_head m_mount_list; /* global mount list */ 98 void __percpu *m_inodegc; /* percpu inodegc structures */ 99 100 /* 101 * Optional cache of rt summary level per bitmap block with the 102 * invariant that m_rsum_cache[bbno] <= the minimum i for which 103 * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip 104 * inode lock. 105 */ 106 uint8_t *m_rsum_cache; 107 struct xfs_mru_cache *m_filestream; /* per-mount filestream data */ 108 struct workqueue_struct *m_buf_workqueue; 109 struct workqueue_struct *m_unwritten_workqueue; 110 struct workqueue_struct *m_reclaim_workqueue; 111 struct workqueue_struct *m_sync_workqueue; 112 struct workqueue_struct *m_blockgc_wq; 113 struct workqueue_struct *m_inodegc_wq; 114 115 int m_bsize; /* fs logical block size */ 116 uint8_t m_blkbit_log; /* blocklog + NBBY */ 117 uint8_t m_blkbb_log; /* blocklog - BBSHIFT */ 118 uint8_t m_agno_log; /* log #ag's */ 119 uint8_t m_sectbb_log; /* sectlog - BBSHIFT */ 120 uint m_blockmask; /* sb_blocksize-1 */ 121 uint m_blockwsize; /* sb_blocksize in words */ 122 uint m_blockwmask; /* blockwsize-1 */ 123 uint m_alloc_mxr[2]; /* max alloc btree records */ 124 uint m_alloc_mnr[2]; /* min alloc btree records */ 125 uint m_bmap_dmxr[2]; /* max bmap btree records */ 126 uint m_bmap_dmnr[2]; /* min bmap btree records */ 127 uint m_rmap_mxr[2]; /* max rmap btree records */ 128 uint m_rmap_mnr[2]; /* min rmap btree records */ 129 uint m_refc_mxr[2]; /* max refc btree records */ 130 uint m_refc_mnr[2]; /* min refc btree records */ 131 uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */ 132 uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */ 133 uint m_rmap_maxlevels; /* max rmap btree levels */ 134 uint m_refc_maxlevels; /* max refcount btree level */ 135 xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */ 136 uint m_alloc_set_aside; /* space we can't use */ 137 uint m_ag_max_usable; /* max space per AG */ 138 int m_dalign; /* stripe unit */ 139 int m_swidth; /* stripe width */ 140 xfs_agnumber_t m_maxagi; /* highest inode alloc group */ 141 uint m_allocsize_log;/* min write size log bytes */ 142 uint m_allocsize_blocks; /* min write size blocks */ 143 int m_logbufs; /* number of log buffers */ 144 int m_logbsize; /* size of each log buffer */ 145 uint m_rsumlevels; /* rt summary levels */ 146 uint m_rsumsize; /* size of rt summary, bytes */ 147 int m_fixedfsid[2]; /* unchanged for life of FS */ 148 uint m_qflags; /* quota status flags */ 149 uint64_t m_features; /* active filesystem features */ 150 uint64_t m_low_space[XFS_LOWSP_MAX]; 151 uint64_t m_low_rtexts[XFS_LOWSP_MAX]; 152 struct xfs_ino_geometry m_ino_geo; /* inode geometry */ 153 struct xfs_trans_resv m_resv; /* precomputed res values */ 154 /* low free space thresholds */ 155 unsigned long m_opstate; /* dynamic state flags */ 156 bool m_always_cow; 157 bool m_fail_unmount; 158 bool m_finobt_nores; /* no per-AG finobt resv. */ 159 bool m_update_sb; /* sb needs update in mount */ 160 161 /* 162 * Bitsets of per-fs metadata that have been checked and/or are sick. 163 * Callers must hold m_sb_lock to access these two fields. 164 */ 165 uint8_t m_fs_checked; 166 uint8_t m_fs_sick; 167 /* 168 * Bitsets of rt metadata that have been checked and/or are sick. 169 * Callers must hold m_sb_lock to access this field. 170 */ 171 uint8_t m_rt_checked; 172 uint8_t m_rt_sick; 173 174 /* 175 * End of read-mostly variables. Frequently written variables and locks 176 * should be placed below this comment from now on. The first variable 177 * here is marked as cacheline aligned so they it is separated from 178 * the read-mostly variables. 179 */ 180 181 spinlock_t ____cacheline_aligned m_sb_lock; /* sb counter lock */ 182 struct percpu_counter m_icount; /* allocated inodes counter */ 183 struct percpu_counter m_ifree; /* free inodes counter */ 184 struct percpu_counter m_fdblocks; /* free block counter */ 185 /* 186 * Count of data device blocks reserved for delayed allocations, 187 * including indlen blocks. Does not include allocated CoW staging 188 * extents or anything related to the rt device. 189 */ 190 struct percpu_counter m_delalloc_blks; 191 /* 192 * Global count of allocation btree blocks in use across all AGs. Only 193 * used when perag reservation is enabled. Helps prevent block 194 * reservation from attempting to reserve allocation btree blocks. 195 */ 196 atomic64_t m_allocbt_blks; 197 198 struct radix_tree_root m_perag_tree; /* per-ag accounting info */ 199 spinlock_t m_perag_lock; /* lock for m_perag_tree */ 200 uint64_t m_resblks; /* total reserved blocks */ 201 uint64_t m_resblks_avail;/* available reserved blocks */ 202 uint64_t m_resblks_save; /* reserved blks @ remount,ro */ 203 struct delayed_work m_reclaim_work; /* background inode reclaim */ 204 struct xfs_kobj m_kobj; 205 struct xfs_kobj m_error_kobj; 206 struct xfs_kobj m_error_meta_kobj; 207 struct xfs_error_cfg m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX]; 208 struct xstats m_stats; /* per-fs stats */ 209 xfs_agnumber_t m_agfrotor; /* last ag where space found */ 210 xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */ 211 spinlock_t m_agirotor_lock;/* .. and lock protecting it */ 212 213 /* Memory shrinker to throttle and reprioritize inodegc */ 214 struct shrinker m_inodegc_shrinker; 215 /* 216 * Workqueue item so that we can coalesce multiple inode flush attempts 217 * into a single flush. 218 */ 219 struct work_struct m_flush_inodes_work; 220 221 /* 222 * Generation of the filesysyem layout. This is incremented by each 223 * growfs, and used by the pNFS server to ensure the client updates 224 * its view of the block device once it gets a layout that might 225 * reference the newly added blocks. Does not need to be persistent 226 * as long as we only allow file system size increments, but if we 227 * ever support shrinks it would have to be persisted in addition 228 * to various other kinds of pain inflicted on the pNFS server. 229 */ 230 uint32_t m_generation; 231 struct mutex m_growlock; /* growfs mutex */ 232 233 #ifdef DEBUG 234 /* 235 * Frequency with which errors are injected. Replaces xfs_etest; the 236 * value stored in here is the inverse of the frequency with which the 237 * error triggers. 1 = always, 2 = half the time, etc. 238 */ 239 unsigned int *m_errortag; 240 struct xfs_kobj m_errortag_kobj; 241 #endif 242 } xfs_mount_t; 243 244 #define M_IGEO(mp) (&(mp)->m_ino_geo) 245 246 /* 247 * Flags for m_features. 248 * 249 * These are all the active features in the filesystem, regardless of how 250 * they are configured. 251 */ 252 #define XFS_FEAT_ATTR (1ULL << 0) /* xattrs present in fs */ 253 #define XFS_FEAT_NLINK (1ULL << 1) /* 32 bit link counts */ 254 #define XFS_FEAT_QUOTA (1ULL << 2) /* quota active */ 255 #define XFS_FEAT_ALIGN (1ULL << 3) /* inode alignment */ 256 #define XFS_FEAT_DALIGN (1ULL << 4) /* data alignment */ 257 #define XFS_FEAT_LOGV2 (1ULL << 5) /* version 2 logs */ 258 #define XFS_FEAT_SECTOR (1ULL << 6) /* sector size > 512 bytes */ 259 #define XFS_FEAT_EXTFLG (1ULL << 7) /* unwritten extents */ 260 #define XFS_FEAT_ASCIICI (1ULL << 8) /* ASCII only case-insens. */ 261 #define XFS_FEAT_LAZYSBCOUNT (1ULL << 9) /* Superblk counters */ 262 #define XFS_FEAT_ATTR2 (1ULL << 10) /* dynamic attr fork */ 263 #define XFS_FEAT_PARENT (1ULL << 11) /* parent pointers */ 264 #define XFS_FEAT_PROJID32 (1ULL << 12) /* 32 bit project id */ 265 #define XFS_FEAT_CRC (1ULL << 13) /* metadata CRCs */ 266 #define XFS_FEAT_V3INODES (1ULL << 14) /* Version 3 inodes */ 267 #define XFS_FEAT_PQUOTINO (1ULL << 15) /* non-shared proj/grp quotas */ 268 #define XFS_FEAT_FTYPE (1ULL << 16) /* inode type in dir */ 269 #define XFS_FEAT_FINOBT (1ULL << 17) /* free inode btree */ 270 #define XFS_FEAT_RMAPBT (1ULL << 18) /* reverse map btree */ 271 #define XFS_FEAT_REFLINK (1ULL << 19) /* reflinked files */ 272 #define XFS_FEAT_SPINODES (1ULL << 20) /* sparse inode chunks */ 273 #define XFS_FEAT_META_UUID (1ULL << 21) /* metadata UUID */ 274 #define XFS_FEAT_REALTIME (1ULL << 22) /* realtime device present */ 275 #define XFS_FEAT_INOBTCNT (1ULL << 23) /* inobt block counts */ 276 #define XFS_FEAT_BIGTIME (1ULL << 24) /* large timestamps */ 277 #define XFS_FEAT_NEEDSREPAIR (1ULL << 25) /* needs xfs_repair */ 278 279 /* Mount features */ 280 #define XFS_FEAT_NOATTR2 (1ULL << 48) /* disable attr2 creation */ 281 #define XFS_FEAT_NOALIGN (1ULL << 49) /* ignore alignment */ 282 #define XFS_FEAT_ALLOCSIZE (1ULL << 50) /* user specified allocation size */ 283 #define XFS_FEAT_LARGE_IOSIZE (1ULL << 51) /* report large preferred 284 * I/O size in stat() */ 285 #define XFS_FEAT_WSYNC (1ULL << 52) /* synchronous metadata ops */ 286 #define XFS_FEAT_DIRSYNC (1ULL << 53) /* synchronous directory ops */ 287 #define XFS_FEAT_DISCARD (1ULL << 54) /* discard unused blocks */ 288 #define XFS_FEAT_GRPID (1ULL << 55) /* group-ID assigned from directory */ 289 #define XFS_FEAT_SMALL_INUMS (1ULL << 56) /* user wants 32bit inodes */ 290 #define XFS_FEAT_IKEEP (1ULL << 57) /* keep empty inode clusters*/ 291 #define XFS_FEAT_SWALLOC (1ULL << 58) /* stripe width allocation */ 292 #define XFS_FEAT_FILESTREAMS (1ULL << 59) /* use filestreams allocator */ 293 #define XFS_FEAT_DAX_ALWAYS (1ULL << 60) /* DAX always enabled */ 294 #define XFS_FEAT_DAX_NEVER (1ULL << 61) /* DAX never enabled */ 295 #define XFS_FEAT_NORECOVERY (1ULL << 62) /* no recovery - dirty fs */ 296 #define XFS_FEAT_NOUUID (1ULL << 63) /* ignore uuid during mount */ 297 298 #define __XFS_HAS_FEAT(name, NAME) \ 299 static inline bool xfs_has_ ## name (struct xfs_mount *mp) \ 300 { \ 301 return mp->m_features & XFS_FEAT_ ## NAME; \ 302 } 303 304 /* Some features can be added dynamically so they need a set wrapper, too. */ 305 #define __XFS_ADD_FEAT(name, NAME) \ 306 __XFS_HAS_FEAT(name, NAME); \ 307 static inline void xfs_add_ ## name (struct xfs_mount *mp) \ 308 { \ 309 mp->m_features |= XFS_FEAT_ ## NAME; \ 310 xfs_sb_version_add ## name(&mp->m_sb); \ 311 } 312 313 /* Superblock features */ 314 __XFS_ADD_FEAT(attr, ATTR) 315 __XFS_HAS_FEAT(nlink, NLINK) 316 __XFS_ADD_FEAT(quota, QUOTA) 317 __XFS_HAS_FEAT(align, ALIGN) 318 __XFS_HAS_FEAT(dalign, DALIGN) 319 __XFS_HAS_FEAT(logv2, LOGV2) 320 __XFS_HAS_FEAT(sector, SECTOR) 321 __XFS_HAS_FEAT(extflg, EXTFLG) 322 __XFS_HAS_FEAT(asciici, ASCIICI) 323 __XFS_HAS_FEAT(lazysbcount, LAZYSBCOUNT) 324 __XFS_ADD_FEAT(attr2, ATTR2) 325 __XFS_HAS_FEAT(parent, PARENT) 326 __XFS_ADD_FEAT(projid32, PROJID32) 327 __XFS_HAS_FEAT(crc, CRC) 328 __XFS_HAS_FEAT(v3inodes, V3INODES) 329 __XFS_HAS_FEAT(pquotino, PQUOTINO) 330 __XFS_HAS_FEAT(ftype, FTYPE) 331 __XFS_HAS_FEAT(finobt, FINOBT) 332 __XFS_HAS_FEAT(rmapbt, RMAPBT) 333 __XFS_HAS_FEAT(reflink, REFLINK) 334 __XFS_HAS_FEAT(sparseinodes, SPINODES) 335 __XFS_HAS_FEAT(metauuid, META_UUID) 336 __XFS_HAS_FEAT(realtime, REALTIME) 337 __XFS_HAS_FEAT(inobtcounts, INOBTCNT) 338 __XFS_HAS_FEAT(bigtime, BIGTIME) 339 __XFS_HAS_FEAT(needsrepair, NEEDSREPAIR) 340 341 /* 342 * Mount features 343 * 344 * These do not change dynamically - features that can come and go, such as 32 345 * bit inodes and read-only state, are kept as operational state rather than 346 * features. 347 */ 348 __XFS_HAS_FEAT(noattr2, NOATTR2) 349 __XFS_HAS_FEAT(noalign, NOALIGN) 350 __XFS_HAS_FEAT(allocsize, ALLOCSIZE) 351 __XFS_HAS_FEAT(large_iosize, LARGE_IOSIZE) 352 __XFS_HAS_FEAT(wsync, WSYNC) 353 __XFS_HAS_FEAT(dirsync, DIRSYNC) 354 __XFS_HAS_FEAT(discard, DISCARD) 355 __XFS_HAS_FEAT(grpid, GRPID) 356 __XFS_HAS_FEAT(small_inums, SMALL_INUMS) 357 __XFS_HAS_FEAT(ikeep, IKEEP) 358 __XFS_HAS_FEAT(swalloc, SWALLOC) 359 __XFS_HAS_FEAT(filestreams, FILESTREAMS) 360 __XFS_HAS_FEAT(dax_always, DAX_ALWAYS) 361 __XFS_HAS_FEAT(dax_never, DAX_NEVER) 362 __XFS_HAS_FEAT(norecovery, NORECOVERY) 363 __XFS_HAS_FEAT(nouuid, NOUUID) 364 365 /* 366 * Operational mount state flags 367 * 368 * Use these with atomic bit ops only! 369 */ 370 #define XFS_OPSTATE_UNMOUNTING 0 /* filesystem is unmounting */ 371 #define XFS_OPSTATE_CLEAN 1 /* mount was clean */ 372 #define XFS_OPSTATE_SHUTDOWN 2 /* stop all fs operations */ 373 #define XFS_OPSTATE_INODE32 3 /* inode32 allocator active */ 374 #define XFS_OPSTATE_READONLY 4 /* read-only fs */ 375 376 /* 377 * If set, inactivation worker threads will be scheduled to process queued 378 * inodegc work. If not, queued inodes remain in memory waiting to be 379 * processed. 380 */ 381 #define XFS_OPSTATE_INODEGC_ENABLED 5 382 /* 383 * If set, background speculative prealloc gc worker threads will be scheduled 384 * to process queued blockgc work. If not, inodes retain their preallocations 385 * until explicitly deleted. 386 */ 387 #define XFS_OPSTATE_BLOCKGC_ENABLED 6 388 389 #define __XFS_IS_OPSTATE(name, NAME) \ 390 static inline bool xfs_is_ ## name (struct xfs_mount *mp) \ 391 { \ 392 return test_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \ 393 } \ 394 static inline bool xfs_clear_ ## name (struct xfs_mount *mp) \ 395 { \ 396 return test_and_clear_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \ 397 } \ 398 static inline bool xfs_set_ ## name (struct xfs_mount *mp) \ 399 { \ 400 return test_and_set_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \ 401 } 402 403 __XFS_IS_OPSTATE(unmounting, UNMOUNTING) 404 __XFS_IS_OPSTATE(clean, CLEAN) 405 __XFS_IS_OPSTATE(shutdown, SHUTDOWN) 406 __XFS_IS_OPSTATE(inode32, INODE32) 407 __XFS_IS_OPSTATE(readonly, READONLY) 408 __XFS_IS_OPSTATE(inodegc_enabled, INODEGC_ENABLED) 409 __XFS_IS_OPSTATE(blockgc_enabled, BLOCKGC_ENABLED) 410 411 #define XFS_OPSTATE_STRINGS \ 412 { (1UL << XFS_OPSTATE_UNMOUNTING), "unmounting" }, \ 413 { (1UL << XFS_OPSTATE_CLEAN), "clean" }, \ 414 { (1UL << XFS_OPSTATE_SHUTDOWN), "shutdown" }, \ 415 { (1UL << XFS_OPSTATE_INODE32), "inode32" }, \ 416 { (1UL << XFS_OPSTATE_READONLY), "read_only" }, \ 417 { (1UL << XFS_OPSTATE_INODEGC_ENABLED), "inodegc" }, \ 418 { (1UL << XFS_OPSTATE_BLOCKGC_ENABLED), "blockgc" } 419 420 /* 421 * Max and min values for mount-option defined I/O 422 * preallocation sizes. 423 */ 424 #define XFS_MAX_IO_LOG 30 /* 1G */ 425 #define XFS_MIN_IO_LOG PAGE_SHIFT 426 427 #define xfs_is_shutdown(mp) xfs_is_shutdown(mp) 428 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname, 429 int lnnum); 430 #define xfs_force_shutdown(m,f) \ 431 xfs_do_force_shutdown(m, f, __FILE__, __LINE__) 432 433 #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */ 434 #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */ 435 #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */ 436 #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */ 437 438 #define XFS_SHUTDOWN_STRINGS \ 439 { SHUTDOWN_META_IO_ERROR, "metadata_io" }, \ 440 { SHUTDOWN_LOG_IO_ERROR, "log_io" }, \ 441 { SHUTDOWN_FORCE_UMOUNT, "force_umount" }, \ 442 { SHUTDOWN_CORRUPT_INCORE, "corruption" } 443 444 /* 445 * Flags for xfs_mountfs 446 */ 447 #define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */ 448 449 static inline xfs_agnumber_t 450 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d) 451 { 452 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d); 453 do_div(ld, mp->m_sb.sb_agblocks); 454 return (xfs_agnumber_t) ld; 455 } 456 457 static inline xfs_agblock_t 458 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d) 459 { 460 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d); 461 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks); 462 } 463 464 int xfs_buf_hash_init(struct xfs_perag *pag); 465 void xfs_buf_hash_destroy(struct xfs_perag *pag); 466 467 extern void xfs_uuid_table_free(void); 468 extern uint64_t xfs_default_resblks(xfs_mount_t *mp); 469 extern int xfs_mountfs(xfs_mount_t *mp); 470 extern void xfs_unmountfs(xfs_mount_t *); 471 472 /* 473 * Deltas for the block count can vary from 1 to very large, but lock contention 474 * only occurs on frequent small block count updates such as in the delayed 475 * allocation path for buffered writes (page a time updates). Hence we set 476 * a large batch count (1024) to minimise global counter updates except when 477 * we get near to ENOSPC and we have to be very accurate with our updates. 478 */ 479 #define XFS_FDBLOCKS_BATCH 1024 480 481 extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta, 482 bool reserved); 483 extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta); 484 485 extern int xfs_readsb(xfs_mount_t *, int); 486 extern void xfs_freesb(xfs_mount_t *); 487 extern bool xfs_fs_writable(struct xfs_mount *mp, int level); 488 extern int xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t); 489 490 extern int xfs_dev_is_read_only(struct xfs_mount *, char *); 491 492 extern void xfs_set_low_space_thresholds(struct xfs_mount *); 493 494 int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb, 495 xfs_off_t count_fsb); 496 497 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp, 498 int error_class, int error); 499 void xfs_force_summary_recalc(struct xfs_mount *mp); 500 int xfs_add_incompat_log_feature(struct xfs_mount *mp, uint32_t feature); 501 bool xfs_clear_incompat_log_features(struct xfs_mount *mp); 502 void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta); 503 504 #endif /* __XFS_MOUNT_H__ */ 505