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 * Frequency with which errors are injected. Replaces xfs_etest; the 203 * value stored in here is the inverse of the frequency with which the 204 * error triggers. 1 = always, 2 = half the time, etc. 205 */ 206 unsigned int *m_errortag; 207 struct xfs_kobj m_errortag_kobj; 208 #endif 209 } xfs_mount_t; 210 211 /* 212 * Flags for m_flags. 213 */ 214 #define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops 215 must be synchronous except 216 for space allocations */ 217 #define XFS_MOUNT_UNMOUNTING (1ULL << 1) /* filesystem is unmounting */ 218 #define XFS_MOUNT_WAS_CLEAN (1ULL << 3) 219 #define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem 220 operations, typically for 221 disk errors in metadata */ 222 #define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */ 223 #define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment 224 allocations */ 225 #define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */ 226 #define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */ 227 #define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */ 228 #define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */ 229 #define XFS_MOUNT_SMALL_INUMS (1ULL << 14) /* user wants 32bit inodes */ 230 #define XFS_MOUNT_32BITINODES (1ULL << 15) /* inode32 allocator active */ 231 #define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */ 232 #define XFS_MOUNT_BARRIER (1ULL << 17) 233 #define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/ 234 #define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width 235 * allocation */ 236 #define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */ 237 #define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */ 238 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred 239 * I/O size in stat() */ 240 #define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams 241 allocator */ 242 #define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */ 243 244 #define XFS_MOUNT_DAX (1ULL << 62) /* TEST ONLY! */ 245 246 247 /* 248 * Default minimum read and write sizes. 249 */ 250 #define XFS_READIO_LOG_LARGE 16 251 #define XFS_WRITEIO_LOG_LARGE 16 252 253 /* 254 * Max and min values for mount-option defined I/O 255 * preallocation sizes. 256 */ 257 #define XFS_MAX_IO_LOG 30 /* 1G */ 258 #define XFS_MIN_IO_LOG PAGE_SHIFT 259 260 /* 261 * Synchronous read and write sizes. This should be 262 * better for NFSv2 wsync filesystems. 263 */ 264 #define XFS_WSYNC_READIO_LOG 15 /* 32k */ 265 #define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */ 266 267 /* 268 * Allow large block sizes to be reported to userspace programs if the 269 * "largeio" mount option is used. 270 * 271 * If compatibility mode is specified, simply return the basic unit of caching 272 * so that we don't get inefficient read/modify/write I/O from user apps. 273 * Otherwise.... 274 * 275 * If the underlying volume is a stripe, then return the stripe width in bytes 276 * as the recommended I/O size. It is not a stripe and we've set a default 277 * buffered I/O size, return that, otherwise return the compat default. 278 */ 279 static inline unsigned long 280 xfs_preferred_iosize(xfs_mount_t *mp) 281 { 282 if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE) 283 return PAGE_SIZE; 284 return (mp->m_swidth ? 285 (mp->m_swidth << mp->m_sb.sb_blocklog) : 286 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ? 287 (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) : 288 PAGE_SIZE)); 289 } 290 291 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \ 292 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN) 293 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN) 294 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname, 295 int lnnum); 296 #define xfs_force_shutdown(m,f) \ 297 xfs_do_force_shutdown(m, f, __FILE__, __LINE__) 298 299 #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */ 300 #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */ 301 #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */ 302 #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */ 303 #define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */ 304 #define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */ 305 306 /* 307 * Flags for xfs_mountfs 308 */ 309 #define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */ 310 311 static inline xfs_agnumber_t 312 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d) 313 { 314 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d); 315 do_div(ld, mp->m_sb.sb_agblocks); 316 return (xfs_agnumber_t) ld; 317 } 318 319 static inline xfs_agblock_t 320 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d) 321 { 322 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d); 323 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks); 324 } 325 326 /* per-AG block reservation data structures*/ 327 enum xfs_ag_resv_type { 328 XFS_AG_RESV_NONE = 0, 329 XFS_AG_RESV_METADATA, 330 XFS_AG_RESV_AGFL, 331 }; 332 333 struct xfs_ag_resv { 334 /* number of blocks originally reserved here */ 335 xfs_extlen_t ar_orig_reserved; 336 /* number of blocks reserved here */ 337 xfs_extlen_t ar_reserved; 338 /* number of blocks originally asked for */ 339 xfs_extlen_t ar_asked; 340 }; 341 342 /* 343 * Per-ag incore structure, copies of information in agf and agi, to improve the 344 * performance of allocation group selection. 345 */ 346 typedef struct xfs_perag { 347 struct xfs_mount *pag_mount; /* owner filesystem */ 348 xfs_agnumber_t pag_agno; /* AG this structure belongs to */ 349 atomic_t pag_ref; /* perag reference count */ 350 char pagf_init; /* this agf's entry is initialized */ 351 char pagi_init; /* this agi's entry is initialized */ 352 char pagf_metadata; /* the agf is preferred to be metadata */ 353 char pagi_inodeok; /* The agi is ok for inodes */ 354 uint8_t pagf_levels[XFS_BTNUM_AGF]; 355 /* # of levels in bno & cnt btree */ 356 uint32_t pagf_flcount; /* count of blocks in freelist */ 357 xfs_extlen_t pagf_freeblks; /* total free blocks */ 358 xfs_extlen_t pagf_longest; /* longest free space */ 359 uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */ 360 xfs_agino_t pagi_freecount; /* number of free inodes */ 361 xfs_agino_t pagi_count; /* number of allocated inodes */ 362 363 /* 364 * Inode allocation search lookup optimisation. 365 * If the pagino matches, the search for new inodes 366 * doesn't need to search the near ones again straight away 367 */ 368 xfs_agino_t pagl_pagino; 369 xfs_agino_t pagl_leftrec; 370 xfs_agino_t pagl_rightrec; 371 spinlock_t pagb_lock; /* lock for pagb_tree */ 372 struct rb_root pagb_tree; /* ordered tree of busy extents */ 373 unsigned int pagb_gen; /* generation count for pagb_tree */ 374 wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */ 375 376 atomic_t pagf_fstrms; /* # of filestreams active in this AG */ 377 378 spinlock_t pag_ici_lock; /* incore inode cache lock */ 379 struct radix_tree_root pag_ici_root; /* incore inode cache root */ 380 int pag_ici_reclaimable; /* reclaimable inodes */ 381 struct mutex pag_ici_reclaim_lock; /* serialisation point */ 382 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */ 383 384 /* buffer cache index */ 385 spinlock_t pag_buf_lock; /* lock for pag_buf_hash */ 386 struct rhashtable pag_buf_hash; 387 388 /* for rcu-safe freeing */ 389 struct rcu_head rcu_head; 390 int pagb_count; /* pagb slots in use */ 391 392 /* Blocks reserved for all kinds of metadata. */ 393 struct xfs_ag_resv pag_meta_resv; 394 /* Blocks reserved for just AGFL-based metadata. */ 395 struct xfs_ag_resv pag_agfl_resv; 396 397 /* reference count */ 398 uint8_t pagf_refcount_level; 399 } xfs_perag_t; 400 401 static inline struct xfs_ag_resv * 402 xfs_perag_resv( 403 struct xfs_perag *pag, 404 enum xfs_ag_resv_type type) 405 { 406 switch (type) { 407 case XFS_AG_RESV_METADATA: 408 return &pag->pag_meta_resv; 409 case XFS_AG_RESV_AGFL: 410 return &pag->pag_agfl_resv; 411 default: 412 return NULL; 413 } 414 } 415 416 int xfs_buf_hash_init(xfs_perag_t *pag); 417 void xfs_buf_hash_destroy(xfs_perag_t *pag); 418 419 extern void xfs_uuid_table_free(void); 420 extern int xfs_log_sbcount(xfs_mount_t *); 421 extern uint64_t xfs_default_resblks(xfs_mount_t *mp); 422 extern int xfs_mountfs(xfs_mount_t *mp); 423 extern int xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount, 424 xfs_agnumber_t *maxagi); 425 extern void xfs_unmountfs(xfs_mount_t *); 426 427 extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta); 428 extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta); 429 extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta, 430 bool reserved); 431 extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta); 432 433 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int); 434 extern int xfs_readsb(xfs_mount_t *, int); 435 extern void xfs_freesb(xfs_mount_t *); 436 extern bool xfs_fs_writable(struct xfs_mount *mp, int level); 437 extern int xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t); 438 439 extern int xfs_dev_is_read_only(struct xfs_mount *, char *); 440 441 extern void xfs_set_low_space_thresholds(struct xfs_mount *); 442 443 int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb, 444 xfs_off_t count_fsb); 445 446 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp, 447 int error_class, int error); 448 449 #endif /* __XFS_MOUNT_H__ */ 450