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_alloc_maxlevels; /* max alloc btree levels */ 132 uint m_bm_maxlevels[2]; /* max bmap btree levels */ 133 uint m_rmap_maxlevels; /* max rmap btree levels */ 134 uint m_refc_maxlevels; /* max refcount btree level */ 135 unsigned int m_agbtree_maxlevels; /* max level of all AG btrees */ 136 xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */ 137 uint m_alloc_set_aside; /* space we can't use */ 138 uint m_ag_max_usable; /* max space per AG */ 139 int m_dalign; /* stripe unit */ 140 int m_swidth; /* stripe width */ 141 xfs_agnumber_t m_maxagi; /* highest inode alloc group */ 142 uint m_allocsize_log;/* min write size log bytes */ 143 uint m_allocsize_blocks; /* min write size blocks */ 144 int m_logbufs; /* number of log buffers */ 145 int m_logbsize; /* size of each log buffer */ 146 uint m_rsumlevels; /* rt summary levels */ 147 uint m_rsumsize; /* size of rt summary, bytes */ 148 int m_fixedfsid[2]; /* unchanged for life of FS */ 149 uint m_qflags; /* quota status flags */ 150 uint64_t m_features; /* active filesystem features */ 151 uint64_t m_low_space[XFS_LOWSP_MAX]; 152 uint64_t m_low_rtexts[XFS_LOWSP_MAX]; 153 struct xfs_ino_geometry m_ino_geo; /* inode geometry */ 154 struct xfs_trans_resv m_resv; /* precomputed res values */ 155 /* low free space thresholds */ 156 unsigned long m_opstate; /* dynamic state flags */ 157 bool m_always_cow; 158 bool m_fail_unmount; 159 bool m_finobt_nores; /* no per-AG finobt resv. */ 160 bool m_update_sb; /* sb needs update in mount */ 161 162 /* 163 * Bitsets of per-fs metadata that have been checked and/or are sick. 164 * Callers must hold m_sb_lock to access these two fields. 165 */ 166 uint8_t m_fs_checked; 167 uint8_t m_fs_sick; 168 /* 169 * Bitsets of rt metadata that have been checked and/or are sick. 170 * Callers must hold m_sb_lock to access this field. 171 */ 172 uint8_t m_rt_checked; 173 uint8_t m_rt_sick; 174 175 /* 176 * End of read-mostly variables. Frequently written variables and locks 177 * should be placed below this comment from now on. The first variable 178 * here is marked as cacheline aligned so they it is separated from 179 * the read-mostly variables. 180 */ 181 182 spinlock_t ____cacheline_aligned m_sb_lock; /* sb counter lock */ 183 struct percpu_counter m_icount; /* allocated inodes counter */ 184 struct percpu_counter m_ifree; /* free inodes counter */ 185 struct percpu_counter m_fdblocks; /* free block counter */ 186 /* 187 * Count of data device blocks reserved for delayed allocations, 188 * including indlen blocks. Does not include allocated CoW staging 189 * extents or anything related to the rt device. 190 */ 191 struct percpu_counter m_delalloc_blks; 192 /* 193 * Global count of allocation btree blocks in use across all AGs. Only 194 * used when perag reservation is enabled. Helps prevent block 195 * reservation from attempting to reserve allocation btree blocks. 196 */ 197 atomic64_t m_allocbt_blks; 198 199 struct radix_tree_root m_perag_tree; /* per-ag accounting info */ 200 spinlock_t m_perag_lock; /* lock for m_perag_tree */ 201 uint64_t m_resblks; /* total reserved blocks */ 202 uint64_t m_resblks_avail;/* available reserved blocks */ 203 uint64_t m_resblks_save; /* reserved blks @ remount,ro */ 204 struct delayed_work m_reclaim_work; /* background inode reclaim */ 205 struct xfs_kobj m_kobj; 206 struct xfs_kobj m_error_kobj; 207 struct xfs_kobj m_error_meta_kobj; 208 struct xfs_error_cfg m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX]; 209 struct xstats m_stats; /* per-fs stats */ 210 xfs_agnumber_t m_agfrotor; /* last ag where space found */ 211 xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */ 212 spinlock_t m_agirotor_lock;/* .. and lock protecting it */ 213 214 /* Memory shrinker to throttle and reprioritize inodegc */ 215 struct shrinker m_inodegc_shrinker; 216 /* 217 * Workqueue item so that we can coalesce multiple inode flush attempts 218 * into a single flush. 219 */ 220 struct work_struct m_flush_inodes_work; 221 222 /* 223 * Generation of the filesysyem layout. This is incremented by each 224 * growfs, and used by the pNFS server to ensure the client updates 225 * its view of the block device once it gets a layout that might 226 * reference the newly added blocks. Does not need to be persistent 227 * as long as we only allow file system size increments, but if we 228 * ever support shrinks it would have to be persisted in addition 229 * to various other kinds of pain inflicted on the pNFS server. 230 */ 231 uint32_t m_generation; 232 struct mutex m_growlock; /* growfs mutex */ 233 234 #ifdef DEBUG 235 /* 236 * Frequency with which errors are injected. Replaces xfs_etest; the 237 * value stored in here is the inverse of the frequency with which the 238 * error triggers. 1 = always, 2 = half the time, etc. 239 */ 240 unsigned int *m_errortag; 241 struct xfs_kobj m_errortag_kobj; 242 #endif 243 } xfs_mount_t; 244 245 #define M_IGEO(mp) (&(mp)->m_ino_geo) 246 247 /* 248 * Flags for m_features. 249 * 250 * These are all the active features in the filesystem, regardless of how 251 * they are configured. 252 */ 253 #define XFS_FEAT_ATTR (1ULL << 0) /* xattrs present in fs */ 254 #define XFS_FEAT_NLINK (1ULL << 1) /* 32 bit link counts */ 255 #define XFS_FEAT_QUOTA (1ULL << 2) /* quota active */ 256 #define XFS_FEAT_ALIGN (1ULL << 3) /* inode alignment */ 257 #define XFS_FEAT_DALIGN (1ULL << 4) /* data alignment */ 258 #define XFS_FEAT_LOGV2 (1ULL << 5) /* version 2 logs */ 259 #define XFS_FEAT_SECTOR (1ULL << 6) /* sector size > 512 bytes */ 260 #define XFS_FEAT_EXTFLG (1ULL << 7) /* unwritten extents */ 261 #define XFS_FEAT_ASCIICI (1ULL << 8) /* ASCII only case-insens. */ 262 #define XFS_FEAT_LAZYSBCOUNT (1ULL << 9) /* Superblk counters */ 263 #define XFS_FEAT_ATTR2 (1ULL << 10) /* dynamic attr fork */ 264 #define XFS_FEAT_PARENT (1ULL << 11) /* parent pointers */ 265 #define XFS_FEAT_PROJID32 (1ULL << 12) /* 32 bit project id */ 266 #define XFS_FEAT_CRC (1ULL << 13) /* metadata CRCs */ 267 #define XFS_FEAT_V3INODES (1ULL << 14) /* Version 3 inodes */ 268 #define XFS_FEAT_PQUOTINO (1ULL << 15) /* non-shared proj/grp quotas */ 269 #define XFS_FEAT_FTYPE (1ULL << 16) /* inode type in dir */ 270 #define XFS_FEAT_FINOBT (1ULL << 17) /* free inode btree */ 271 #define XFS_FEAT_RMAPBT (1ULL << 18) /* reverse map btree */ 272 #define XFS_FEAT_REFLINK (1ULL << 19) /* reflinked files */ 273 #define XFS_FEAT_SPINODES (1ULL << 20) /* sparse inode chunks */ 274 #define XFS_FEAT_META_UUID (1ULL << 21) /* metadata UUID */ 275 #define XFS_FEAT_REALTIME (1ULL << 22) /* realtime device present */ 276 #define XFS_FEAT_INOBTCNT (1ULL << 23) /* inobt block counts */ 277 #define XFS_FEAT_BIGTIME (1ULL << 24) /* large timestamps */ 278 #define XFS_FEAT_NEEDSREPAIR (1ULL << 25) /* needs xfs_repair */ 279 280 /* Mount features */ 281 #define XFS_FEAT_NOATTR2 (1ULL << 48) /* disable attr2 creation */ 282 #define XFS_FEAT_NOALIGN (1ULL << 49) /* ignore alignment */ 283 #define XFS_FEAT_ALLOCSIZE (1ULL << 50) /* user specified allocation size */ 284 #define XFS_FEAT_LARGE_IOSIZE (1ULL << 51) /* report large preferred 285 * I/O size in stat() */ 286 #define XFS_FEAT_WSYNC (1ULL << 52) /* synchronous metadata ops */ 287 #define XFS_FEAT_DIRSYNC (1ULL << 53) /* synchronous directory ops */ 288 #define XFS_FEAT_DISCARD (1ULL << 54) /* discard unused blocks */ 289 #define XFS_FEAT_GRPID (1ULL << 55) /* group-ID assigned from directory */ 290 #define XFS_FEAT_SMALL_INUMS (1ULL << 56) /* user wants 32bit inodes */ 291 #define XFS_FEAT_IKEEP (1ULL << 57) /* keep empty inode clusters*/ 292 #define XFS_FEAT_SWALLOC (1ULL << 58) /* stripe width allocation */ 293 #define XFS_FEAT_FILESTREAMS (1ULL << 59) /* use filestreams allocator */ 294 #define XFS_FEAT_DAX_ALWAYS (1ULL << 60) /* DAX always enabled */ 295 #define XFS_FEAT_DAX_NEVER (1ULL << 61) /* DAX never enabled */ 296 #define XFS_FEAT_NORECOVERY (1ULL << 62) /* no recovery - dirty fs */ 297 #define XFS_FEAT_NOUUID (1ULL << 63) /* ignore uuid during mount */ 298 299 #define __XFS_HAS_FEAT(name, NAME) \ 300 static inline bool xfs_has_ ## name (struct xfs_mount *mp) \ 301 { \ 302 return mp->m_features & XFS_FEAT_ ## NAME; \ 303 } 304 305 /* Some features can be added dynamically so they need a set wrapper, too. */ 306 #define __XFS_ADD_FEAT(name, NAME) \ 307 __XFS_HAS_FEAT(name, NAME); \ 308 static inline void xfs_add_ ## name (struct xfs_mount *mp) \ 309 { \ 310 mp->m_features |= XFS_FEAT_ ## NAME; \ 311 xfs_sb_version_add ## name(&mp->m_sb); \ 312 } 313 314 /* Superblock features */ 315 __XFS_ADD_FEAT(attr, ATTR) 316 __XFS_HAS_FEAT(nlink, NLINK) 317 __XFS_ADD_FEAT(quota, QUOTA) 318 __XFS_HAS_FEAT(align, ALIGN) 319 __XFS_HAS_FEAT(dalign, DALIGN) 320 __XFS_HAS_FEAT(logv2, LOGV2) 321 __XFS_HAS_FEAT(sector, SECTOR) 322 __XFS_HAS_FEAT(extflg, EXTFLG) 323 __XFS_HAS_FEAT(asciici, ASCIICI) 324 __XFS_HAS_FEAT(lazysbcount, LAZYSBCOUNT) 325 __XFS_ADD_FEAT(attr2, ATTR2) 326 __XFS_HAS_FEAT(parent, PARENT) 327 __XFS_ADD_FEAT(projid32, PROJID32) 328 __XFS_HAS_FEAT(crc, CRC) 329 __XFS_HAS_FEAT(v3inodes, V3INODES) 330 __XFS_HAS_FEAT(pquotino, PQUOTINO) 331 __XFS_HAS_FEAT(ftype, FTYPE) 332 __XFS_HAS_FEAT(finobt, FINOBT) 333 __XFS_HAS_FEAT(rmapbt, RMAPBT) 334 __XFS_HAS_FEAT(reflink, REFLINK) 335 __XFS_HAS_FEAT(sparseinodes, SPINODES) 336 __XFS_HAS_FEAT(metauuid, META_UUID) 337 __XFS_HAS_FEAT(realtime, REALTIME) 338 __XFS_HAS_FEAT(inobtcounts, INOBTCNT) 339 __XFS_HAS_FEAT(bigtime, BIGTIME) 340 __XFS_HAS_FEAT(needsrepair, NEEDSREPAIR) 341 342 /* 343 * Mount features 344 * 345 * These do not change dynamically - features that can come and go, such as 32 346 * bit inodes and read-only state, are kept as operational state rather than 347 * features. 348 */ 349 __XFS_HAS_FEAT(noattr2, NOATTR2) 350 __XFS_HAS_FEAT(noalign, NOALIGN) 351 __XFS_HAS_FEAT(allocsize, ALLOCSIZE) 352 __XFS_HAS_FEAT(large_iosize, LARGE_IOSIZE) 353 __XFS_HAS_FEAT(wsync, WSYNC) 354 __XFS_HAS_FEAT(dirsync, DIRSYNC) 355 __XFS_HAS_FEAT(discard, DISCARD) 356 __XFS_HAS_FEAT(grpid, GRPID) 357 __XFS_HAS_FEAT(small_inums, SMALL_INUMS) 358 __XFS_HAS_FEAT(ikeep, IKEEP) 359 __XFS_HAS_FEAT(swalloc, SWALLOC) 360 __XFS_HAS_FEAT(filestreams, FILESTREAMS) 361 __XFS_HAS_FEAT(dax_always, DAX_ALWAYS) 362 __XFS_HAS_FEAT(dax_never, DAX_NEVER) 363 __XFS_HAS_FEAT(norecovery, NORECOVERY) 364 __XFS_HAS_FEAT(nouuid, NOUUID) 365 366 /* 367 * Operational mount state flags 368 * 369 * Use these with atomic bit ops only! 370 */ 371 #define XFS_OPSTATE_UNMOUNTING 0 /* filesystem is unmounting */ 372 #define XFS_OPSTATE_CLEAN 1 /* mount was clean */ 373 #define XFS_OPSTATE_SHUTDOWN 2 /* stop all fs operations */ 374 #define XFS_OPSTATE_INODE32 3 /* inode32 allocator active */ 375 #define XFS_OPSTATE_READONLY 4 /* read-only fs */ 376 377 /* 378 * If set, inactivation worker threads will be scheduled to process queued 379 * inodegc work. If not, queued inodes remain in memory waiting to be 380 * processed. 381 */ 382 #define XFS_OPSTATE_INODEGC_ENABLED 5 383 /* 384 * If set, background speculative prealloc gc worker threads will be scheduled 385 * to process queued blockgc work. If not, inodes retain their preallocations 386 * until explicitly deleted. 387 */ 388 #define XFS_OPSTATE_BLOCKGC_ENABLED 6 389 390 #define __XFS_IS_OPSTATE(name, NAME) \ 391 static inline bool xfs_is_ ## name (struct xfs_mount *mp) \ 392 { \ 393 return test_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \ 394 } \ 395 static inline bool xfs_clear_ ## name (struct xfs_mount *mp) \ 396 { \ 397 return test_and_clear_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \ 398 } \ 399 static inline bool xfs_set_ ## name (struct xfs_mount *mp) \ 400 { \ 401 return test_and_set_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \ 402 } 403 404 __XFS_IS_OPSTATE(unmounting, UNMOUNTING) 405 __XFS_IS_OPSTATE(clean, CLEAN) 406 __XFS_IS_OPSTATE(shutdown, SHUTDOWN) 407 __XFS_IS_OPSTATE(inode32, INODE32) 408 __XFS_IS_OPSTATE(readonly, READONLY) 409 __XFS_IS_OPSTATE(inodegc_enabled, INODEGC_ENABLED) 410 __XFS_IS_OPSTATE(blockgc_enabled, BLOCKGC_ENABLED) 411 412 #define XFS_OPSTATE_STRINGS \ 413 { (1UL << XFS_OPSTATE_UNMOUNTING), "unmounting" }, \ 414 { (1UL << XFS_OPSTATE_CLEAN), "clean" }, \ 415 { (1UL << XFS_OPSTATE_SHUTDOWN), "shutdown" }, \ 416 { (1UL << XFS_OPSTATE_INODE32), "inode32" }, \ 417 { (1UL << XFS_OPSTATE_READONLY), "read_only" }, \ 418 { (1UL << XFS_OPSTATE_INODEGC_ENABLED), "inodegc" }, \ 419 { (1UL << XFS_OPSTATE_BLOCKGC_ENABLED), "blockgc" } 420 421 /* 422 * Max and min values for mount-option defined I/O 423 * preallocation sizes. 424 */ 425 #define XFS_MAX_IO_LOG 30 /* 1G */ 426 #define XFS_MIN_IO_LOG PAGE_SHIFT 427 428 #define xfs_is_shutdown(mp) xfs_is_shutdown(mp) 429 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname, 430 int lnnum); 431 #define xfs_force_shutdown(m,f) \ 432 xfs_do_force_shutdown(m, f, __FILE__, __LINE__) 433 434 #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */ 435 #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */ 436 #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */ 437 #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */ 438 439 #define XFS_SHUTDOWN_STRINGS \ 440 { SHUTDOWN_META_IO_ERROR, "metadata_io" }, \ 441 { SHUTDOWN_LOG_IO_ERROR, "log_io" }, \ 442 { SHUTDOWN_FORCE_UMOUNT, "force_umount" }, \ 443 { SHUTDOWN_CORRUPT_INCORE, "corruption" } 444 445 /* 446 * Flags for xfs_mountfs 447 */ 448 #define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */ 449 450 static inline xfs_agnumber_t 451 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d) 452 { 453 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d); 454 do_div(ld, mp->m_sb.sb_agblocks); 455 return (xfs_agnumber_t) ld; 456 } 457 458 static inline xfs_agblock_t 459 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d) 460 { 461 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d); 462 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks); 463 } 464 465 int xfs_buf_hash_init(struct xfs_perag *pag); 466 void xfs_buf_hash_destroy(struct xfs_perag *pag); 467 468 extern void xfs_uuid_table_free(void); 469 extern uint64_t xfs_default_resblks(xfs_mount_t *mp); 470 extern int xfs_mountfs(xfs_mount_t *mp); 471 extern void xfs_unmountfs(xfs_mount_t *); 472 473 /* 474 * Deltas for the block count can vary from 1 to very large, but lock contention 475 * only occurs on frequent small block count updates such as in the delayed 476 * allocation path for buffered writes (page a time updates). Hence we set 477 * a large batch count (1024) to minimise global counter updates except when 478 * we get near to ENOSPC and we have to be very accurate with our updates. 479 */ 480 #define XFS_FDBLOCKS_BATCH 1024 481 482 /* 483 * Estimate the amount of free space that is not available to userspace and is 484 * not explicitly reserved from the incore fdblocks. This includes: 485 * 486 * - The minimum number of blocks needed to support splitting a bmap btree 487 * - The blocks currently in use by the freespace btrees because they record 488 * the actual blocks that will fill per-AG metadata space reservations 489 */ 490 static inline uint64_t 491 xfs_fdblocks_unavailable( 492 struct xfs_mount *mp) 493 { 494 return mp->m_alloc_set_aside + atomic64_read(&mp->m_allocbt_blks); 495 } 496 497 extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta, 498 bool reserved); 499 extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta); 500 501 extern int xfs_readsb(xfs_mount_t *, int); 502 extern void xfs_freesb(xfs_mount_t *); 503 extern bool xfs_fs_writable(struct xfs_mount *mp, int level); 504 extern int xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t); 505 506 extern int xfs_dev_is_read_only(struct xfs_mount *, char *); 507 508 extern void xfs_set_low_space_thresholds(struct xfs_mount *); 509 510 int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb, 511 xfs_off_t count_fsb); 512 513 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp, 514 int error_class, int error); 515 void xfs_force_summary_recalc(struct xfs_mount *mp); 516 int xfs_add_incompat_log_feature(struct xfs_mount *mp, uint32_t feature); 517 bool xfs_clear_incompat_log_features(struct xfs_mount *mp); 518 void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta); 519 520 #endif /* __XFS_MOUNT_H__ */ 521