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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__ */