1 /* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 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. 8 * 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. 13 * 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 17 */ 18 #ifndef __XFS_MOUNT_H__ 19 #define __XFS_MOUNT_H__ 20 21 struct xlog; 22 struct xfs_inode; 23 struct xfs_mru_cache; 24 struct xfs_nameops; 25 struct xfs_ail; 26 struct xfs_quotainfo; 27 struct xfs_dir_ops; 28 struct xfs_da_geometry; 29 30 /* dynamic preallocation free space thresholds, 5% down to 1% */ 31 enum { 32 XFS_LOWSP_1_PCNT = 0, 33 XFS_LOWSP_2_PCNT, 34 XFS_LOWSP_3_PCNT, 35 XFS_LOWSP_4_PCNT, 36 XFS_LOWSP_5_PCNT, 37 XFS_LOWSP_MAX, 38 }; 39 40 /* 41 * Error Configuration 42 * 43 * Error classes define the subsystem the configuration belongs to. 44 * Error numbers define the errors that are configurable. 45 */ 46 enum { 47 XFS_ERR_METADATA, 48 XFS_ERR_CLASS_MAX, 49 }; 50 enum { 51 XFS_ERR_DEFAULT, 52 XFS_ERR_EIO, 53 XFS_ERR_ENOSPC, 54 XFS_ERR_ENODEV, 55 XFS_ERR_ERRNO_MAX, 56 }; 57 58 #define XFS_ERR_RETRY_FOREVER -1 59 60 /* 61 * Although retry_timeout is in jiffies which is normally an unsigned long, 62 * we limit the retry timeout to 86400 seconds, or one day. So even a 63 * signed 32-bit long is sufficient for a HZ value up to 24855. Making it 64 * signed lets us store the special "-1" value, meaning retry forever. 65 */ 66 struct xfs_error_cfg { 67 struct xfs_kobj kobj; 68 int max_retries; 69 long retry_timeout; /* in jiffies, -1 = infinite */ 70 }; 71 72 typedef struct xfs_mount { 73 struct super_block *m_super; 74 xfs_tid_t m_tid; /* next unused tid for fs */ 75 struct xfs_ail *m_ail; /* fs active log item list */ 76 77 struct xfs_sb m_sb; /* copy of fs superblock */ 78 spinlock_t m_sb_lock; /* sb counter lock */ 79 struct percpu_counter m_icount; /* allocated inodes counter */ 80 struct percpu_counter m_ifree; /* free inodes counter */ 81 struct percpu_counter m_fdblocks; /* free block counter */ 82 83 struct xfs_buf *m_sb_bp; /* buffer for superblock */ 84 char *m_fsname; /* filesystem name */ 85 int m_fsname_len; /* strlen of fs name */ 86 char *m_rtname; /* realtime device name */ 87 char *m_logname; /* external log device name */ 88 int m_bsize; /* fs logical block size */ 89 xfs_agnumber_t m_agfrotor; /* last ag where space found */ 90 xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */ 91 spinlock_t m_agirotor_lock;/* .. and lock protecting it */ 92 xfs_agnumber_t m_maxagi; /* highest inode alloc group */ 93 uint m_readio_log; /* min read size log bytes */ 94 uint m_readio_blocks; /* min read size blocks */ 95 uint m_writeio_log; /* min write size log bytes */ 96 uint m_writeio_blocks; /* min write size blocks */ 97 struct xfs_da_geometry *m_dir_geo; /* directory block geometry */ 98 struct xfs_da_geometry *m_attr_geo; /* attribute block geometry */ 99 struct xlog *m_log; /* log specific stuff */ 100 int m_logbufs; /* number of log buffers */ 101 int m_logbsize; /* size of each log buffer */ 102 uint m_rsumlevels; /* rt summary levels */ 103 uint m_rsumsize; /* size of rt summary, bytes */ 104 struct xfs_inode *m_rbmip; /* pointer to bitmap inode */ 105 struct xfs_inode *m_rsumip; /* pointer to summary inode */ 106 struct xfs_inode *m_rootip; /* pointer to root directory */ 107 struct xfs_quotainfo *m_quotainfo; /* disk quota information */ 108 xfs_buftarg_t *m_ddev_targp; /* saves taking the address */ 109 xfs_buftarg_t *m_logdev_targp;/* ptr to log device */ 110 xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */ 111 __uint8_t m_blkbit_log; /* blocklog + NBBY */ 112 __uint8_t m_blkbb_log; /* blocklog - BBSHIFT */ 113 __uint8_t m_agno_log; /* log #ag's */ 114 __uint8_t m_agino_log; /* #bits for agino in inum */ 115 uint m_inode_cluster_size;/* min inode buf size */ 116 uint m_blockmask; /* sb_blocksize-1 */ 117 uint m_blockwsize; /* sb_blocksize in words */ 118 uint m_blockwmask; /* blockwsize-1 */ 119 uint m_alloc_mxr[2]; /* max alloc btree records */ 120 uint m_alloc_mnr[2]; /* min alloc btree records */ 121 uint m_bmap_dmxr[2]; /* max bmap btree records */ 122 uint m_bmap_dmnr[2]; /* min bmap btree records */ 123 uint m_inobt_mxr[2]; /* max inobt btree records */ 124 uint m_inobt_mnr[2]; /* min inobt btree records */ 125 uint m_rmap_mxr[2]; /* max rmap btree records */ 126 uint m_rmap_mnr[2]; /* min rmap btree records */ 127 uint m_refc_mxr[2]; /* max refc btree records */ 128 uint m_refc_mnr[2]; /* min refc btree records */ 129 uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */ 130 uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */ 131 uint m_in_maxlevels; /* max inobt btree levels. */ 132 uint m_rmap_maxlevels; /* max rmap btree levels */ 133 uint m_refc_maxlevels; /* max refcount btree level */ 134 xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */ 135 uint m_alloc_set_aside; /* space we can't use */ 136 uint m_ag_max_usable; /* max space per AG */ 137 struct radix_tree_root m_perag_tree; /* per-ag accounting info */ 138 spinlock_t m_perag_lock; /* lock for m_perag_tree */ 139 struct mutex m_growlock; /* growfs mutex */ 140 int m_fixedfsid[2]; /* unchanged for life of FS */ 141 uint m_dmevmask; /* DMI events for this FS */ 142 __uint64_t m_flags; /* global mount flags */ 143 bool m_inotbt_nores; /* no per-AG finobt resv. */ 144 int m_ialloc_inos; /* inodes in inode allocation */ 145 int m_ialloc_blks; /* blocks in inode allocation */ 146 int m_ialloc_min_blks;/* min blocks in sparse inode 147 * allocation */ 148 int m_inoalign_mask;/* mask sb_inoalignmt if used */ 149 uint m_qflags; /* quota status flags */ 150 struct xfs_trans_resv m_resv; /* precomputed res values */ 151 __uint64_t m_maxicount; /* maximum inode count */ 152 __uint64_t m_resblks; /* total reserved blocks */ 153 __uint64_t m_resblks_avail;/* available reserved blocks */ 154 __uint64_t m_resblks_save; /* reserved blks @ remount,ro */ 155 int m_dalign; /* stripe unit */ 156 int m_swidth; /* stripe width */ 157 int m_sinoalign; /* stripe unit inode alignment */ 158 __uint8_t m_sectbb_log; /* sectlog - BBSHIFT */ 159 const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */ 160 const struct xfs_dir_ops *m_dir_inode_ops; /* vector of dir inode ops */ 161 const struct xfs_dir_ops *m_nondir_inode_ops; /* !dir inode ops */ 162 uint m_chsize; /* size of next field */ 163 atomic_t m_active_trans; /* number trans frozen */ 164 struct xfs_mru_cache *m_filestream; /* per-mount filestream data */ 165 struct delayed_work m_reclaim_work; /* background inode reclaim */ 166 struct delayed_work m_eofblocks_work; /* background eof blocks 167 trimming */ 168 struct delayed_work m_cowblocks_work; /* background cow blocks 169 trimming */ 170 bool m_update_sb; /* sb needs update in mount */ 171 int64_t m_low_space[XFS_LOWSP_MAX]; 172 /* low free space thresholds */ 173 struct xfs_kobj m_kobj; 174 struct xfs_kobj m_error_kobj; 175 struct xfs_kobj m_error_meta_kobj; 176 struct xfs_error_cfg m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX]; 177 struct xstats m_stats; /* per-fs stats */ 178 179 struct workqueue_struct *m_buf_workqueue; 180 struct workqueue_struct *m_data_workqueue; 181 struct workqueue_struct *m_unwritten_workqueue; 182 struct workqueue_struct *m_cil_workqueue; 183 struct workqueue_struct *m_reclaim_workqueue; 184 struct workqueue_struct *m_log_workqueue; 185 struct workqueue_struct *m_eofblocks_workqueue; 186 struct workqueue_struct *m_sync_workqueue; 187 188 /* 189 * Generation of the filesysyem layout. This is incremented by each 190 * growfs, and used by the pNFS server to ensure the client updates 191 * its view of the block device once it gets a layout that might 192 * reference the newly added blocks. Does not need to be persistent 193 * as long as we only allow file system size increments, but if we 194 * ever support shrinks it would have to be persisted in addition 195 * to various other kinds of pain inflicted on the pNFS server. 196 */ 197 __uint32_t m_generation; 198 199 bool m_fail_unmount; 200 #ifdef DEBUG 201 /* 202 * DEBUG mode instrumentation to test and/or trigger delayed allocation 203 * block killing in the event of failed writes. When enabled, all 204 * buffered writes are silenty dropped and handled as if they failed. 205 * All delalloc blocks in the range of the write (including pre-existing 206 * delalloc blocks!) are tossed as part of the write failure error 207 * handling sequence. 208 */ 209 bool m_drop_writes; 210 #endif 211 } xfs_mount_t; 212 213 /* 214 * Flags for m_flags. 215 */ 216 #define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops 217 must be synchronous except 218 for space allocations */ 219 #define XFS_MOUNT_UNMOUNTING (1ULL << 1) /* filesystem is unmounting */ 220 #define XFS_MOUNT_WAS_CLEAN (1ULL << 3) 221 #define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem 222 operations, typically for 223 disk errors in metadata */ 224 #define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */ 225 #define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment 226 allocations */ 227 #define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */ 228 #define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */ 229 #define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */ 230 #define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */ 231 #define XFS_MOUNT_SMALL_INUMS (1ULL << 14) /* user wants 32bit inodes */ 232 #define XFS_MOUNT_32BITINODES (1ULL << 15) /* inode32 allocator active */ 233 #define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */ 234 #define XFS_MOUNT_BARRIER (1ULL << 17) 235 #define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/ 236 #define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width 237 * allocation */ 238 #define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */ 239 #define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */ 240 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred 241 * I/O size in stat() */ 242 #define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams 243 allocator */ 244 #define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */ 245 246 #define XFS_MOUNT_DAX (1ULL << 62) /* TEST ONLY! */ 247 248 249 /* 250 * Default minimum read and write sizes. 251 */ 252 #define XFS_READIO_LOG_LARGE 16 253 #define XFS_WRITEIO_LOG_LARGE 16 254 255 /* 256 * Max and min values for mount-option defined I/O 257 * preallocation sizes. 258 */ 259 #define XFS_MAX_IO_LOG 30 /* 1G */ 260 #define XFS_MIN_IO_LOG PAGE_SHIFT 261 262 /* 263 * Synchronous read and write sizes. This should be 264 * better for NFSv2 wsync filesystems. 265 */ 266 #define XFS_WSYNC_READIO_LOG 15 /* 32k */ 267 #define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */ 268 269 /* 270 * Allow large block sizes to be reported to userspace programs if the 271 * "largeio" mount option is used. 272 * 273 * If compatibility mode is specified, simply return the basic unit of caching 274 * so that we don't get inefficient read/modify/write I/O from user apps. 275 * Otherwise.... 276 * 277 * If the underlying volume is a stripe, then return the stripe width in bytes 278 * as the recommended I/O size. It is not a stripe and we've set a default 279 * buffered I/O size, return that, otherwise return the compat default. 280 */ 281 static inline unsigned long 282 xfs_preferred_iosize(xfs_mount_t *mp) 283 { 284 if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE) 285 return PAGE_SIZE; 286 return (mp->m_swidth ? 287 (mp->m_swidth << mp->m_sb.sb_blocklog) : 288 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ? 289 (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) : 290 PAGE_SIZE)); 291 } 292 293 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \ 294 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN) 295 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN) 296 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname, 297 int lnnum); 298 #define xfs_force_shutdown(m,f) \ 299 xfs_do_force_shutdown(m, f, __FILE__, __LINE__) 300 301 #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */ 302 #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */ 303 #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */ 304 #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */ 305 #define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */ 306 #define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */ 307 308 /* 309 * Flags for xfs_mountfs 310 */ 311 #define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */ 312 313 static inline xfs_agnumber_t 314 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d) 315 { 316 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d); 317 do_div(ld, mp->m_sb.sb_agblocks); 318 return (xfs_agnumber_t) ld; 319 } 320 321 static inline xfs_agblock_t 322 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d) 323 { 324 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d); 325 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks); 326 } 327 328 #ifdef DEBUG 329 static inline bool 330 xfs_mp_drop_writes(struct xfs_mount *mp) 331 { 332 return mp->m_drop_writes; 333 } 334 #else 335 static inline bool 336 xfs_mp_drop_writes(struct xfs_mount *mp) 337 { 338 return 0; 339 } 340 #endif 341 342 /* per-AG block reservation data structures*/ 343 enum xfs_ag_resv_type { 344 XFS_AG_RESV_NONE = 0, 345 XFS_AG_RESV_METADATA, 346 XFS_AG_RESV_AGFL, 347 }; 348 349 struct xfs_ag_resv { 350 /* number of blocks originally reserved here */ 351 xfs_extlen_t ar_orig_reserved; 352 /* number of blocks reserved here */ 353 xfs_extlen_t ar_reserved; 354 /* number of blocks originally asked for */ 355 xfs_extlen_t ar_asked; 356 }; 357 358 /* 359 * Per-ag incore structure, copies of information in agf and agi, to improve the 360 * performance of allocation group selection. 361 */ 362 typedef struct xfs_perag { 363 struct xfs_mount *pag_mount; /* owner filesystem */ 364 xfs_agnumber_t pag_agno; /* AG this structure belongs to */ 365 atomic_t pag_ref; /* perag reference count */ 366 char pagf_init; /* this agf's entry is initialized */ 367 char pagi_init; /* this agi's entry is initialized */ 368 char pagf_metadata; /* the agf is preferred to be metadata */ 369 char pagi_inodeok; /* The agi is ok for inodes */ 370 __uint8_t pagf_levels[XFS_BTNUM_AGF]; 371 /* # of levels in bno & cnt btree */ 372 __uint32_t pagf_flcount; /* count of blocks in freelist */ 373 xfs_extlen_t pagf_freeblks; /* total free blocks */ 374 xfs_extlen_t pagf_longest; /* longest free space */ 375 __uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ 376 xfs_agino_t pagi_freecount; /* number of free inodes */ 377 xfs_agino_t pagi_count; /* number of allocated inodes */ 378 379 /* 380 * Inode allocation search lookup optimisation. 381 * If the pagino matches, the search for new inodes 382 * doesn't need to search the near ones again straight away 383 */ 384 xfs_agino_t pagl_pagino; 385 xfs_agino_t pagl_leftrec; 386 xfs_agino_t pagl_rightrec; 387 spinlock_t pagb_lock; /* lock for pagb_tree */ 388 struct rb_root pagb_tree; /* ordered tree of busy extents */ 389 unsigned int pagb_gen; /* generation count for pagb_tree */ 390 wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */ 391 392 atomic_t pagf_fstrms; /* # of filestreams active in this AG */ 393 394 spinlock_t pag_ici_lock; /* incore inode cache lock */ 395 struct radix_tree_root pag_ici_root; /* incore inode cache root */ 396 int pag_ici_reclaimable; /* reclaimable inodes */ 397 struct mutex pag_ici_reclaim_lock; /* serialisation point */ 398 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */ 399 400 /* buffer cache index */ 401 spinlock_t pag_buf_lock; /* lock for pag_buf_hash */ 402 struct rhashtable pag_buf_hash; 403 404 /* for rcu-safe freeing */ 405 struct rcu_head rcu_head; 406 int pagb_count; /* pagb slots in use */ 407 408 /* Blocks reserved for all kinds of metadata. */ 409 struct xfs_ag_resv pag_meta_resv; 410 /* Blocks reserved for just AGFL-based metadata. */ 411 struct xfs_ag_resv pag_agfl_resv; 412 413 /* reference count */ 414 __uint8_t pagf_refcount_level; 415 } xfs_perag_t; 416 417 static inline struct xfs_ag_resv * 418 xfs_perag_resv( 419 struct xfs_perag *pag, 420 enum xfs_ag_resv_type type) 421 { 422 switch (type) { 423 case XFS_AG_RESV_METADATA: 424 return &pag->pag_meta_resv; 425 case XFS_AG_RESV_AGFL: 426 return &pag->pag_agfl_resv; 427 default: 428 return NULL; 429 } 430 } 431 432 int xfs_buf_hash_init(xfs_perag_t *pag); 433 void xfs_buf_hash_destroy(xfs_perag_t *pag); 434 435 extern void xfs_uuid_table_free(void); 436 extern int xfs_log_sbcount(xfs_mount_t *); 437 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp); 438 extern int xfs_mountfs(xfs_mount_t *mp); 439 extern int xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount, 440 xfs_agnumber_t *maxagi); 441 extern void xfs_unmountfs(xfs_mount_t *); 442 443 extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta); 444 extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta); 445 extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta, 446 bool reserved); 447 extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta); 448 449 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int); 450 extern int xfs_readsb(xfs_mount_t *, int); 451 extern void xfs_freesb(xfs_mount_t *); 452 extern bool xfs_fs_writable(struct xfs_mount *mp, int level); 453 extern int xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t); 454 455 extern int xfs_dev_is_read_only(struct xfs_mount *, char *); 456 457 extern void xfs_set_low_space_thresholds(struct xfs_mount *); 458 459 int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb, 460 xfs_off_t count_fsb); 461 462 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp, 463 int error_class, int error); 464 465 #endif /* __XFS_MOUNT_H__ */ 466