1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
6 #ifndef __XFS_MOUNT_H__
7 #define __XFS_MOUNT_H__
14 struct xfs_da_geometry;
16 /* dynamic preallocation free space thresholds, 5% down to 1% */
29 * Error classes define the subsystem the configuration belongs to.
30 * Error numbers define the errors that are configurable.
44 #define XFS_ERR_RETRY_FOREVER -1
47 * Although retry_timeout is in jiffies which is normally an unsigned long,
48 * we limit the retry timeout to 86400 seconds, or one day. So even a
49 * signed 32-bit long is sufficient for a HZ value up to 24855. Making it
50 * signed lets us store the special "-1" value, meaning retry forever.
52 struct xfs_error_cfg {
55 long retry_timeout; /* in jiffies, -1 = infinite */
58 typedef struct xfs_mount {
59 struct super_block *m_super;
62 * Bitsets of per-fs metadata that have been checked and/or are sick.
63 * Callers must hold m_sb_lock to access these two fields.
68 * Bitsets of rt metadata that have been checked and/or are sick.
69 * Callers must hold m_sb_lock to access this field.
74 struct xfs_ail *m_ail; /* fs active log item list */
76 struct xfs_sb m_sb; /* copy of fs superblock */
77 spinlock_t m_sb_lock; /* sb counter lock */
78 struct percpu_counter m_icount; /* allocated inodes counter */
79 struct percpu_counter m_ifree; /* free inodes counter */
80 struct percpu_counter m_fdblocks; /* free block counter */
82 * Count of data device blocks reserved for delayed allocations,
83 * including indlen blocks. Does not include allocated CoW staging
84 * extents or anything related to the rt device.
86 struct percpu_counter m_delalloc_blks;
88 struct xfs_buf *m_sb_bp; /* buffer for superblock */
89 char *m_rtname; /* realtime device name */
90 char *m_logname; /* external log device name */
91 int m_bsize; /* fs logical block size */
92 xfs_agnumber_t m_agfrotor; /* last ag where space found */
93 xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
94 spinlock_t m_agirotor_lock;/* .. and lock protecting it */
95 xfs_agnumber_t m_maxagi; /* highest inode alloc group */
96 uint m_allocsize_log;/* min write size log bytes */
97 uint m_allocsize_blocks; /* min write size blocks */
98 struct xfs_da_geometry *m_dir_geo; /* directory block geometry */
99 struct xfs_da_geometry *m_attr_geo; /* attribute block geometry */
100 struct xlog *m_log; /* log specific stuff */
101 struct xfs_ino_geometry m_ino_geo; /* inode geometry */
102 int m_logbufs; /* number of log buffers */
103 int m_logbsize; /* size of each log buffer */
104 uint m_rsumlevels; /* rt summary levels */
105 uint m_rsumsize; /* size of rt summary, bytes */
107 * Optional cache of rt summary level per bitmap block with the
108 * invariant that m_rsum_cache[bbno] <= the minimum i for which
109 * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
112 uint8_t *m_rsum_cache;
113 struct xfs_inode *m_rbmip; /* pointer to bitmap inode */
114 struct xfs_inode *m_rsumip; /* pointer to summary inode */
115 struct xfs_inode *m_rootip; /* pointer to root directory */
116 struct xfs_quotainfo *m_quotainfo; /* disk quota information */
117 xfs_buftarg_t *m_ddev_targp; /* saves taking the address */
118 xfs_buftarg_t *m_logdev_targp;/* ptr to log device */
119 xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */
120 uint8_t m_blkbit_log; /* blocklog + NBBY */
121 uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
122 uint8_t m_agno_log; /* log #ag's */
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_ag_maxlevels; /* XFS_AG_MAXLEVELS */
135 uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
136 uint m_rmap_maxlevels; /* max rmap btree levels */
137 uint m_refc_maxlevels; /* max refcount btree level */
138 xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */
139 uint m_alloc_set_aside; /* space we can't use */
140 uint m_ag_max_usable; /* max space per AG */
141 struct radix_tree_root m_perag_tree; /* per-ag accounting info */
142 spinlock_t m_perag_lock; /* lock for m_perag_tree */
143 struct mutex m_growlock; /* growfs mutex */
144 int m_fixedfsid[2]; /* unchanged for life of FS */
145 uint64_t m_flags; /* global mount flags */
146 bool m_finobt_nores; /* no per-AG finobt resv. */
147 uint m_qflags; /* quota status flags */
148 struct xfs_trans_resv m_resv; /* precomputed res values */
149 uint64_t m_resblks; /* total reserved blocks */
150 uint64_t m_resblks_avail;/* available reserved blocks */
151 uint64_t m_resblks_save; /* reserved blks @ remount,ro */
152 int m_dalign; /* stripe unit */
153 int m_swidth; /* stripe width */
154 uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
155 atomic_t m_active_trans; /* number trans frozen */
156 struct xfs_mru_cache *m_filestream; /* per-mount filestream data */
157 struct delayed_work m_reclaim_work; /* background inode reclaim */
158 struct delayed_work m_eofblocks_work; /* background eof blocks
160 struct delayed_work m_cowblocks_work; /* background cow blocks
162 bool m_update_sb; /* sb needs update in mount */
163 int64_t m_low_space[XFS_LOWSP_MAX];
164 /* low free space thresholds */
165 struct xfs_kobj m_kobj;
166 struct xfs_kobj m_error_kobj;
167 struct xfs_kobj m_error_meta_kobj;
168 struct xfs_error_cfg m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
169 struct xstats m_stats; /* per-fs stats */
172 * Workqueue item so that we can coalesce multiple inode flush attempts
173 * into a single flush.
175 struct work_struct m_flush_inodes_work;
176 struct workqueue_struct *m_buf_workqueue;
177 struct workqueue_struct *m_unwritten_workqueue;
178 struct workqueue_struct *m_cil_workqueue;
179 struct workqueue_struct *m_reclaim_workqueue;
180 struct workqueue_struct *m_eofblocks_workqueue;
181 struct workqueue_struct *m_sync_workqueue;
184 * Generation of the filesysyem layout. This is incremented by each
185 * growfs, and used by the pNFS server to ensure the client updates
186 * its view of the block device once it gets a layout that might
187 * reference the newly added blocks. Does not need to be persistent
188 * as long as we only allow file system size increments, but if we
189 * ever support shrinks it would have to be persisted in addition
190 * to various other kinds of pain inflicted on the pNFS server.
192 uint32_t m_generation;
198 * Frequency with which errors are injected. Replaces xfs_etest; the
199 * value stored in here is the inverse of the frequency with which the
200 * error triggers. 1 = always, 2 = half the time, etc.
202 unsigned int *m_errortag;
203 struct xfs_kobj m_errortag_kobj;
207 #define M_IGEO(mp) (&(mp)->m_ino_geo)
212 #define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
213 must be synchronous except
214 for space allocations */
215 #define XFS_MOUNT_UNMOUNTING (1ULL << 1) /* filesystem is unmounting */
216 #define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
217 #define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
218 operations, typically for
219 disk errors in metadata */
220 #define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */
221 #define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
223 #define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
224 #define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
225 #define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
226 #define XFS_MOUNT_ALLOCSIZE (1ULL << 12) /* specified allocation size */
227 #define XFS_MOUNT_SMALL_INUMS (1ULL << 14) /* user wants 32bit inodes */
228 #define XFS_MOUNT_32BITINODES (1ULL << 15) /* inode32 allocator active */
229 #define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
230 #define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
231 #define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
233 #define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
234 #define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
235 #define XFS_MOUNT_LARGEIO (1ULL << 22) /* report large preferred
236 * I/O size in stat() */
237 #define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
239 #define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
240 #define XFS_MOUNT_DAX_ALWAYS (1ULL << 26)
241 #define XFS_MOUNT_DAX_NEVER (1ULL << 27)
244 * Max and min values for mount-option defined I/O
245 * preallocation sizes.
247 #define XFS_MAX_IO_LOG 30 /* 1G */
248 #define XFS_MIN_IO_LOG PAGE_SHIFT
250 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
251 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
252 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
253 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
255 #define xfs_force_shutdown(m,f) \
256 xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
258 #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
259 #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
260 #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
261 #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
264 * Flags for xfs_mountfs
266 #define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
268 static inline xfs_agnumber_t
269 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
271 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
272 do_div(ld, mp->m_sb.sb_agblocks);
273 return (xfs_agnumber_t) ld;
276 static inline xfs_agblock_t
277 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
279 xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
280 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
283 /* per-AG block reservation data structures*/
285 /* number of blocks originally reserved here */
286 xfs_extlen_t ar_orig_reserved;
287 /* number of blocks reserved here */
288 xfs_extlen_t ar_reserved;
289 /* number of blocks originally asked for */
290 xfs_extlen_t ar_asked;
294 * Per-ag incore structure, copies of information in agf and agi, to improve the
295 * performance of allocation group selection.
297 typedef struct xfs_perag {
298 struct xfs_mount *pag_mount; /* owner filesystem */
299 xfs_agnumber_t pag_agno; /* AG this structure belongs to */
300 atomic_t pag_ref; /* perag reference count */
301 char pagf_init; /* this agf's entry is initialized */
302 char pagi_init; /* this agi's entry is initialized */
303 char pagf_metadata; /* the agf is preferred to be metadata */
304 char pagi_inodeok; /* The agi is ok for inodes */
305 uint8_t pagf_levels[XFS_BTNUM_AGF];
306 /* # of levels in bno & cnt btree */
307 bool pagf_agflreset; /* agfl requires reset before use */
308 uint32_t pagf_flcount; /* count of blocks in freelist */
309 xfs_extlen_t pagf_freeblks; /* total free blocks */
310 xfs_extlen_t pagf_longest; /* longest free space */
311 uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
312 xfs_agino_t pagi_freecount; /* number of free inodes */
313 xfs_agino_t pagi_count; /* number of allocated inodes */
316 * Inode allocation search lookup optimisation.
317 * If the pagino matches, the search for new inodes
318 * doesn't need to search the near ones again straight away
320 xfs_agino_t pagl_pagino;
321 xfs_agino_t pagl_leftrec;
322 xfs_agino_t pagl_rightrec;
325 * Bitsets of per-ag metadata that have been checked and/or are sick.
326 * Callers should hold pag_state_lock before accessing this field.
328 uint16_t pag_checked;
330 spinlock_t pag_state_lock;
332 spinlock_t pagb_lock; /* lock for pagb_tree */
333 struct rb_root pagb_tree; /* ordered tree of busy extents */
334 unsigned int pagb_gen; /* generation count for pagb_tree */
335 wait_queue_head_t pagb_wait; /* woken when pagb_gen changes */
337 atomic_t pagf_fstrms; /* # of filestreams active in this AG */
339 spinlock_t pag_ici_lock; /* incore inode cache lock */
340 struct radix_tree_root pag_ici_root; /* incore inode cache root */
341 int pag_ici_reclaimable; /* reclaimable inodes */
342 struct mutex pag_ici_reclaim_lock; /* serialisation point */
343 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
345 /* buffer cache index */
346 spinlock_t pag_buf_lock; /* lock for pag_buf_hash */
347 struct rhashtable pag_buf_hash;
349 /* for rcu-safe freeing */
350 struct rcu_head rcu_head;
351 int pagb_count; /* pagb slots in use */
353 /* Blocks reserved for all kinds of metadata. */
354 struct xfs_ag_resv pag_meta_resv;
355 /* Blocks reserved for the reverse mapping btree. */
356 struct xfs_ag_resv pag_rmapbt_resv;
358 /* reference count */
359 uint8_t pagf_refcount_level;
362 * Unlinked inode information. This incore information reflects
363 * data stored in the AGI, so callers must hold the AGI buffer lock
364 * or have some other means to control concurrency.
366 struct rhashtable pagi_unlinked_hash;
369 static inline struct xfs_ag_resv *
371 struct xfs_perag *pag,
372 enum xfs_ag_resv_type type)
375 case XFS_AG_RESV_METADATA:
376 return &pag->pag_meta_resv;
377 case XFS_AG_RESV_RMAPBT:
378 return &pag->pag_rmapbt_resv;
384 int xfs_buf_hash_init(xfs_perag_t *pag);
385 void xfs_buf_hash_destroy(xfs_perag_t *pag);
387 extern void xfs_uuid_table_free(void);
388 extern int xfs_log_sbcount(xfs_mount_t *);
389 extern uint64_t xfs_default_resblks(xfs_mount_t *mp);
390 extern int xfs_mountfs(xfs_mount_t *mp);
391 extern int xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
392 xfs_agnumber_t *maxagi);
393 extern void xfs_unmountfs(xfs_mount_t *);
395 extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
396 extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
397 extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
399 extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
401 extern struct xfs_buf *xfs_getsb(xfs_mount_t *);
402 extern int xfs_readsb(xfs_mount_t *, int);
403 extern void xfs_freesb(xfs_mount_t *);
404 extern bool xfs_fs_writable(struct xfs_mount *mp, int level);
405 extern int xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t);
407 extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
409 extern void xfs_set_low_space_thresholds(struct xfs_mount *);
411 int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
412 xfs_off_t count_fsb);
414 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
415 int error_class, int error);
416 void xfs_force_summary_recalc(struct xfs_mount *mp);
417 void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta);
419 #endif /* __XFS_MOUNT_H__ */