summaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_mount.h
blob: e091f3b3fa15820b6f63b7fcbc5687f3f7e3007b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef __XFS_MOUNT_H__
#define	__XFS_MOUNT_H__

struct xlog;
struct xfs_inode;
struct xfs_mru_cache;
struct xfs_ail;
struct xfs_quotainfo;
struct xfs_da_geometry;
struct xfs_perag;

/* dynamic preallocation free space thresholds, 5% down to 1% */
enum {
	XFS_LOWSP_1_PCNT = 0,
	XFS_LOWSP_2_PCNT,
	XFS_LOWSP_3_PCNT,
	XFS_LOWSP_4_PCNT,
	XFS_LOWSP_5_PCNT,
	XFS_LOWSP_MAX,
};

/*
 * Error Configuration
 *
 * Error classes define the subsystem the configuration belongs to.
 * Error numbers define the errors that are configurable.
 */
enum {
	XFS_ERR_METADATA,
	XFS_ERR_CLASS_MAX,
};
enum {
	XFS_ERR_DEFAULT,
	XFS_ERR_EIO,
	XFS_ERR_ENOSPC,
	XFS_ERR_ENODEV,
	XFS_ERR_ERRNO_MAX,
};

#define XFS_ERR_RETRY_FOREVER	-1

/*
 * Although retry_timeout is in jiffies which is normally an unsigned long,
 * we limit the retry timeout to 86400 seconds, or one day.  So even a
 * signed 32-bit long is sufficient for a HZ value up to 24855.  Making it
 * signed lets us store the special "-1" value, meaning retry forever.
 */
struct xfs_error_cfg {
	struct xfs_kobj	kobj;
	int		max_retries;
	long		retry_timeout;	/* in jiffies, -1 = infinite */
};

/*
 * Per-cpu deferred inode inactivation GC lists.
 */
struct xfs_inodegc {
	struct llist_head	list;
	struct work_struct	work;

	/* approximate count of inodes in the list */
	unsigned int		items;
	unsigned int		shrinker_hits;
};

/*
 * The struct xfsmount layout is optimised to separate read-mostly variables
 * from variables that are frequently modified. We put the read-mostly variables
 * first, then place all the other variables at the end.
 *
 * Typically, read-mostly variables are those that are set at mount time and
 * never changed again, or only change rarely as a result of things like sysfs
 * knobs being tweaked.
 */
typedef struct xfs_mount {
	struct xfs_sb		m_sb;		/* copy of fs superblock */
	struct super_block	*m_super;
	struct xfs_ail		*m_ail;		/* fs active log item list */
	struct xfs_buf		*m_sb_bp;	/* buffer for superblock */
	char			*m_rtname;	/* realtime device name */
	char			*m_logname;	/* external log device name */
	struct xfs_da_geometry	*m_dir_geo;	/* directory block geometry */
	struct xfs_da_geometry	*m_attr_geo;	/* attribute block geometry */
	struct xlog		*m_log;		/* log specific stuff */
	struct xfs_inode	*m_rbmip;	/* pointer to bitmap inode */
	struct xfs_inode	*m_rsumip;	/* pointer to summary inode */
	struct xfs_inode	*m_rootip;	/* pointer to root directory */
	struct xfs_quotainfo	*m_quotainfo;	/* disk quota information */
	xfs_buftarg_t		*m_ddev_targp;	/* saves taking the address */
	xfs_buftarg_t		*m_logdev_targp;/* ptr to log device */
	xfs_buftarg_t		*m_rtdev_targp;	/* ptr to rt device */
	struct list_head	m_mount_list;	/* global mount list */
	void __percpu		*m_inodegc;	/* percpu inodegc structures */

	/*
	 * Optional cache of rt summary level per bitmap block with the
	 * invariant that m_rsum_cache[bbno] <= the minimum i for which
	 * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
	 * inode lock.
	 */
	uint8_t			*m_rsum_cache;
	struct xfs_mru_cache	*m_filestream;  /* per-mount filestream data */
	struct workqueue_struct *m_buf_workqueue;
	struct workqueue_struct	*m_unwritten_workqueue;
	struct workqueue_struct	*m_reclaim_workqueue;
	struct workqueue_struct	*m_sync_workqueue;
	struct workqueue_struct *m_blockgc_wq;
	struct workqueue_struct *m_inodegc_wq;

	int			m_bsize;	/* fs logical block size */
	uint8_t			m_blkbit_log;	/* blocklog + NBBY */
	uint8_t			m_blkbb_log;	/* blocklog - BBSHIFT */
	uint8_t			m_agno_log;	/* log #ag's */
	uint8_t			m_sectbb_log;	/* sectlog - BBSHIFT */
	uint			m_blockmask;	/* sb_blocksize-1 */
	uint			m_blockwsize;	/* sb_blocksize in words */
	uint			m_blockwmask;	/* blockwsize-1 */
	uint			m_alloc_mxr[2];	/* max alloc btree records */
	uint			m_alloc_mnr[2];	/* min alloc btree records */
	uint			m_bmap_dmxr[2];	/* max bmap btree records */
	uint			m_bmap_dmnr[2];	/* min bmap btree records */
	uint			m_rmap_mxr[2];	/* max rmap btree records */
	uint			m_rmap_mnr[2];	/* min rmap btree records */
	uint			m_refc_mxr[2];	/* max refc btree records */
	uint			m_refc_mnr[2];	/* min refc btree records */
	uint			m_ag_maxlevels;	/* XFS_AG_MAXLEVELS */
	uint			m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
	uint			m_rmap_maxlevels; /* max rmap btree levels */
	uint			m_refc_maxlevels; /* max refcount btree level */
	xfs_extlen_t		m_ag_prealloc_blocks; /* reserved ag blocks */
	uint			m_alloc_set_aside; /* space we can't use */
	uint			m_ag_max_usable; /* max space per AG */
	int			m_dalign;	/* stripe unit */
	int			m_swidth;	/* stripe width */
	xfs_agnumber_t		m_maxagi;	/* highest inode alloc group */
	uint			m_allocsize_log;/* min write size log bytes */
	uint			m_allocsize_blocks; /* min write size blocks */
	int			m_logbufs;	/* number of log buffers */
	int			m_logbsize;	/* size of each log buffer */
	uint			m_rsumlevels;	/* rt summary levels */
	uint			m_rsumsize;	/* size of rt summary, bytes */
	int			m_fixedfsid[2];	/* unchanged for life of FS */
	uint			m_qflags;	/* quota status flags */
	uint64_t		m_features;	/* active filesystem features */
	uint64_t		m_low_space[XFS_LOWSP_MAX];
	uint64_t		m_low_rtexts[XFS_LOWSP_MAX];
	struct xfs_ino_geometry	m_ino_geo;	/* inode geometry */
	struct xfs_trans_resv	m_resv;		/* precomputed res values */
						/* low free space thresholds */
	unsigned long		m_opstate;	/* dynamic state flags */
	bool			m_always_cow;
	bool			m_fail_unmount;
	bool			m_finobt_nores; /* no per-AG finobt resv. */
	bool			m_update_sb;	/* sb needs update in mount */

	/*
	 * Bitsets of per-fs metadata that have been checked and/or are sick.
	 * Callers must hold m_sb_lock to access these two fields.
	 */
	uint8_t			m_fs_checked;
	uint8_t			m_fs_sick;
	/*
	 * Bitsets of rt metadata that have been checked and/or are sick.
	 * Callers must hold m_sb_lock to access this field.
	 */
	uint8_t			m_rt_checked;
	uint8_t			m_rt_sick;

	/*
	 * End of read-mostly variables. Frequently written variables and locks
	 * should be placed below this comment from now on. The first variable
	 * here is marked as cacheline aligned so they it is separated from
	 * the read-mostly variables.
	 */

	spinlock_t ____cacheline_aligned m_sb_lock; /* sb counter lock */
	struct percpu_counter	m_icount;	/* allocated inodes counter */
	struct percpu_counter	m_ifree;	/* free inodes counter */
	struct percpu_counter	m_fdblocks;	/* free block counter */
	/*
	 * Count of data device blocks reserved for delayed allocations,
	 * including indlen blocks.  Does not include allocated CoW staging
	 * extents or anything related to the rt device.
	 */
	struct percpu_counter	m_delalloc_blks;
	/*
	 * Global count of allocation btree blocks in use across all AGs. Only
	 * used when perag reservation is enabled. Helps prevent block
	 * reservation from attempting to reserve allocation btree blocks.
	 */
	atomic64_t		m_allocbt_blks;

	struct radix_tree_root	m_perag_tree;	/* per-ag accounting info */
	spinlock_t		m_perag_lock;	/* lock for m_perag_tree */
	uint64_t		m_resblks;	/* total reserved blocks */
	uint64_t		m_resblks_avail;/* available reserved blocks */
	uint64_t		m_resblks_save;	/* reserved blks @ remount,ro */
	struct delayed_work	m_reclaim_work;	/* background inode reclaim */
	struct xfs_kobj		m_kobj;
	struct xfs_kobj		m_error_kobj;
	struct xfs_kobj		m_error_meta_kobj;
	struct xfs_error_cfg	m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
	struct xstats		m_stats;	/* per-fs stats */
	xfs_agnumber_t		m_agfrotor;	/* last ag where space found */
	xfs_agnumber_t		m_agirotor;	/* last ag dir inode alloced */
	spinlock_t		m_agirotor_lock;/* .. and lock protecting it */

	/* Memory shrinker to throttle and reprioritize inodegc */
	struct shrinker		m_inodegc_shrinker;
	/*
	 * Workqueue item so that we can coalesce multiple inode flush attempts
	 * into a single flush.
	 */
	struct work_struct	m_flush_inodes_work;

	/*
	 * Generation of the filesysyem layout.  This is incremented by each
	 * growfs, and used by the pNFS server to ensure the client updates
	 * its view of the block device once it gets a layout that might
	 * reference the newly added blocks.  Does not need to be persistent
	 * as long as we only allow file system size increments, but if we
	 * ever support shrinks it would have to be persisted in addition
	 * to various other kinds of pain inflicted on the pNFS server.
	 */
	uint32_t		m_generation;
	struct mutex		m_growlock;	/* growfs mutex */

#ifdef DEBUG
	/*
	 * Frequency with which errors are injected.  Replaces xfs_etest; the
	 * value stored in here is the inverse of the frequency with which the
	 * error triggers.  1 = always, 2 = half the time, etc.
	 */
	unsigned int		*m_errortag;
	struct xfs_kobj		m_errortag_kobj;
#endif
} xfs_mount_t;

#define M_IGEO(mp)		(&(mp)->m_ino_geo)

/*
 * Flags for m_features.
 *
 * These are all the active features in the filesystem, regardless of how
 * they are configured.
 */
#define XFS_FEAT_ATTR		(1ULL << 0)	/* xattrs present in fs */
#define XFS_FEAT_NLINK		(1ULL << 1)	/* 32 bit link counts */
#define XFS_FEAT_QUOTA		(1ULL << 2)	/* quota active */
#define XFS_FEAT_ALIGN		(1ULL << 3)	/* inode alignment */
#define XFS_FEAT_DALIGN		(1ULL << 4)	/* data alignment */
#define XFS_FEAT_LOGV2		(1ULL << 5)	/* version 2 logs */
#define XFS_FEAT_SECTOR		(1ULL << 6)	/* sector size > 512 bytes */
#define XFS_FEAT_EXTFLG		(1ULL << 7)	/* unwritten extents */
#define XFS_FEAT_ASCIICI	(1ULL << 8)	/* ASCII only case-insens. */
#define XFS_FEAT_LAZYSBCOUNT	(1ULL << 9)	/* Superblk counters */
#define XFS_FEAT_ATTR2		(1ULL << 10)	/* dynamic attr fork */
#define XFS_FEAT_PARENT		(1ULL << 11)	/* parent pointers */
#define XFS_FEAT_PROJID32	(1ULL << 12)	/* 32 bit project id */
#define XFS_FEAT_CRC		(1ULL << 13)	/* metadata CRCs */
#define XFS_FEAT_V3INODES	(1ULL << 14)	/* Version 3 inodes */
#define XFS_FEAT_PQUOTINO	(1ULL << 15)	/* non-shared proj/grp quotas */
#define XFS_FEAT_FTYPE		(1ULL << 16)	/* inode type in dir */
#define XFS_FEAT_FINOBT		(1ULL << 17)	/* free inode btree */
#define XFS_FEAT_RMAPBT		(1ULL << 18)	/* reverse map btree */
#define XFS_FEAT_REFLINK	(1ULL << 19)	/* reflinked files */
#define XFS_FEAT_SPINODES	(1ULL << 20)	/* sparse inode chunks */
#define XFS_FEAT_META_UUID	(1ULL << 21)	/* metadata UUID */
#define XFS_FEAT_REALTIME	(1ULL << 22)	/* realtime device present */
#define XFS_FEAT_INOBTCNT	(1ULL << 23)	/* inobt block counts */
#define XFS_FEAT_BIGTIME	(1ULL << 24)	/* large timestamps */
#define XFS_FEAT_NEEDSREPAIR	(1ULL << 25)	/* needs xfs_repair */

/* Mount features */
#define XFS_FEAT_NOATTR2	(1ULL << 48)	/* disable attr2 creation */
#define XFS_FEAT_NOALIGN	(1ULL << 49)	/* ignore alignment */
#define XFS_FEAT_ALLOCSIZE	(1ULL << 50)	/* user specified allocation size */
#define XFS_FEAT_LARGE_IOSIZE	(1ULL << 51)	/* report large preferred
						 * I/O size in stat() */
#define XFS_FEAT_WSYNC		(1ULL << 52)	/* synchronous metadata ops */
#define XFS_FEAT_DIRSYNC	(1ULL << 53)	/* synchronous directory ops */
#define XFS_FEAT_DISCARD	(1ULL << 54)	/* discard unused blocks */
#define XFS_FEAT_GRPID		(1ULL << 55)	/* group-ID assigned from directory */
#define XFS_FEAT_SMALL_INUMS	(1ULL << 56)	/* user wants 32bit inodes */
#define XFS_FEAT_IKEEP		(1ULL << 57)	/* keep empty inode clusters*/
#define XFS_FEAT_SWALLOC	(1ULL << 58)	/* stripe width allocation */
#define XFS_FEAT_FILESTREAMS	(1ULL << 59)	/* use filestreams allocator */
#define XFS_FEAT_DAX_ALWAYS	(1ULL << 60)	/* DAX always enabled */
#define XFS_FEAT_DAX_NEVER	(1ULL << 61)	/* DAX never enabled */
#define XFS_FEAT_NORECOVERY	(1ULL << 62)	/* no recovery - dirty fs */
#define XFS_FEAT_NOUUID		(1ULL << 63)	/* ignore uuid during mount */

#define __XFS_HAS_FEAT(name, NAME) \
static inline bool xfs_has_ ## name (struct xfs_mount *mp) \
{ \
	return mp->m_features & XFS_FEAT_ ## NAME; \
}

/* Some features can be added dynamically so they need a set wrapper, too. */
#define __XFS_ADD_FEAT(name, NAME) \
	__XFS_HAS_FEAT(name, NAME); \
static inline void xfs_add_ ## name (struct xfs_mount *mp) \
{ \
	mp->m_features |= XFS_FEAT_ ## NAME; \
	xfs_sb_version_add ## name(&mp->m_sb); \
}

/* Superblock features */
__XFS_ADD_FEAT(attr, ATTR)
__XFS_HAS_FEAT(nlink, NLINK)
__XFS_ADD_FEAT(quota, QUOTA)
__XFS_HAS_FEAT(align, ALIGN)
__XFS_HAS_FEAT(dalign, DALIGN)
__XFS_HAS_FEAT(logv2, LOGV2)
__XFS_HAS_FEAT(sector, SECTOR)
__XFS_HAS_FEAT(extflg, EXTFLG)
__XFS_HAS_FEAT(asciici, ASCIICI)
__XFS_HAS_FEAT(lazysbcount, LAZYSBCOUNT)
__XFS_ADD_FEAT(attr2, ATTR2)
__XFS_HAS_FEAT(parent, PARENT)
__XFS_ADD_FEAT(projid32, PROJID32)
__XFS_HAS_FEAT(crc, CRC)
__XFS_HAS_FEAT(v3inodes, V3INODES)
__XFS_HAS_FEAT(pquotino, PQUOTINO)
__XFS_HAS_FEAT(ftype, FTYPE)
__XFS_HAS_FEAT(finobt, FINOBT)
__XFS_HAS_FEAT(rmapbt, RMAPBT)
__XFS_HAS_FEAT(reflink, REFLINK)
__XFS_HAS_FEAT(sparseinodes, SPINODES)
__XFS_HAS_FEAT(metauuid, META_UUID)
__XFS_HAS_FEAT(realtime, REALTIME)
__XFS_HAS_FEAT(inobtcounts, INOBTCNT)
__XFS_HAS_FEAT(bigtime, BIGTIME)
__XFS_HAS_FEAT(needsrepair, NEEDSREPAIR)

/*
 * Mount features
 *
 * These do not change dynamically - features that can come and go, such as 32
 * bit inodes and read-only state, are kept as operational state rather than
 * features.
 */
__XFS_HAS_FEAT(noattr2, NOATTR2)
__XFS_HAS_FEAT(noalign, NOALIGN)
__XFS_HAS_FEAT(allocsize, ALLOCSIZE)
__XFS_HAS_FEAT(large_iosize, LARGE_IOSIZE)
__XFS_HAS_FEAT(wsync, WSYNC)
__XFS_HAS_FEAT(dirsync, DIRSYNC)
__XFS_HAS_FEAT(discard, DISCARD)
__XFS_HAS_FEAT(grpid, GRPID)
__XFS_HAS_FEAT(small_inums, SMALL_INUMS)
__XFS_HAS_FEAT(ikeep, IKEEP)
__XFS_HAS_FEAT(swalloc, SWALLOC)
__XFS_HAS_FEAT(filestreams, FILESTREAMS)
__XFS_HAS_FEAT(dax_always, DAX_ALWAYS)
__XFS_HAS_FEAT(dax_never, DAX_NEVER)
__XFS_HAS_FEAT(norecovery, NORECOVERY)
__XFS_HAS_FEAT(nouuid, NOUUID)

/*
 * Operational mount state flags
 *
 * Use these with atomic bit ops only!
 */
#define XFS_OPSTATE_UNMOUNTING		0	/* filesystem is unmounting */
#define XFS_OPSTATE_CLEAN		1	/* mount was clean */
#define XFS_OPSTATE_SHUTDOWN		2	/* stop all fs operations */
#define XFS_OPSTATE_INODE32		3	/* inode32 allocator active */
#define XFS_OPSTATE_READONLY		4	/* read-only fs */

/*
 * If set, inactivation worker threads will be scheduled to process queued
 * inodegc work.  If not, queued inodes remain in memory waiting to be
 * processed.
 */
#define XFS_OPSTATE_INODEGC_ENABLED	5
/*
 * If set, background speculative prealloc gc worker threads will be scheduled
 * to process queued blockgc work.  If not, inodes retain their preallocations
 * until explicitly deleted.
 */
#define XFS_OPSTATE_BLOCKGC_ENABLED	6

#define __XFS_IS_OPSTATE(name, NAME) \
static inline bool xfs_is_ ## name (struct xfs_mount *mp) \
{ \
	return test_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
} \
static inline bool xfs_clear_ ## name (struct xfs_mount *mp) \
{ \
	return test_and_clear_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
} \
static inline bool xfs_set_ ## name (struct xfs_mount *mp) \
{ \
	return test_and_set_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
}

__XFS_IS_OPSTATE(unmounting, UNMOUNTING)
__XFS_IS_OPSTATE(clean, CLEAN)
__XFS_IS_OPSTATE(shutdown, SHUTDOWN)
__XFS_IS_OPSTATE(inode32, INODE32)
__XFS_IS_OPSTATE(readonly, READONLY)
__XFS_IS_OPSTATE(inodegc_enabled, INODEGC_ENABLED)
__XFS_IS_OPSTATE(blockgc_enabled, BLOCKGC_ENABLED)

#define XFS_OPSTATE_STRINGS \
	{ (1UL << XFS_OPSTATE_UNMOUNTING),		"unmounting" }, \
	{ (1UL << XFS_OPSTATE_CLEAN),			"clean" }, \
	{ (1UL << XFS_OPSTATE_SHUTDOWN),		"shutdown" }, \
	{ (1UL << XFS_OPSTATE_INODE32),			"inode32" }, \
	{ (1UL << XFS_OPSTATE_READONLY),		"read_only" }, \
	{ (1UL << XFS_OPSTATE_INODEGC_ENABLED),		"inodegc" }, \
	{ (1UL << XFS_OPSTATE_BLOCKGC_ENABLED),		"blockgc" }

/*
 * Max and min values for mount-option defined I/O
 * preallocation sizes.
 */
#define XFS_MAX_IO_LOG		30	/* 1G */
#define XFS_MIN_IO_LOG		PAGE_SHIFT

#define xfs_is_shutdown(mp)		xfs_is_shutdown(mp)
void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
		int lnnum);
#define xfs_force_shutdown(m,f)	\
	xfs_do_force_shutdown(m, f, __FILE__, __LINE__)

#define SHUTDOWN_META_IO_ERROR	0x0001	/* write attempt to metadata failed */
#define SHUTDOWN_LOG_IO_ERROR	0x0002	/* write attempt to the log failed */
#define SHUTDOWN_FORCE_UMOUNT	0x0004	/* shutdown from a forced unmount */
#define SHUTDOWN_CORRUPT_INCORE	0x0008	/* corrupt in-memory data structures */

#define XFS_SHUTDOWN_STRINGS \
	{ SHUTDOWN_META_IO_ERROR,	"metadata_io" }, \
	{ SHUTDOWN_LOG_IO_ERROR,	"log_io" }, \
	{ SHUTDOWN_FORCE_UMOUNT,	"force_umount" }, \
	{ SHUTDOWN_CORRUPT_INCORE,	"corruption" }

/*
 * Flags for xfs_mountfs
 */
#define XFS_MFSI_QUIET		0x40	/* Be silent if mount errors found */

static inline xfs_agnumber_t
xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
{
	xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
	do_div(ld, mp->m_sb.sb_agblocks);
	return (xfs_agnumber_t) ld;
}

static inline xfs_agblock_t
xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
{
	xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
	return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
}

int xfs_buf_hash_init(struct xfs_perag *pag);
void xfs_buf_hash_destroy(struct xfs_perag *pag);

extern void	xfs_uuid_table_free(void);
extern uint64_t xfs_default_resblks(xfs_mount_t *mp);
extern int	xfs_mountfs(xfs_mount_t *mp);
extern void	xfs_unmountfs(xfs_mount_t *);

/*
 * Deltas for the block count can vary from 1 to very large, but lock contention
 * only occurs on frequent small block count updates such as in the delayed
 * allocation path for buffered writes (page a time updates). Hence we set
 * a large batch count (1024) to minimise global counter updates except when
 * we get near to ENOSPC and we have to be very accurate with our updates.
 */
#define XFS_FDBLOCKS_BATCH	1024

extern int	xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
				 bool reserved);
extern int	xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);

extern int	xfs_readsb(xfs_mount_t *, int);
extern void	xfs_freesb(xfs_mount_t *);
extern bool	xfs_fs_writable(struct xfs_mount *mp, int level);
extern int	xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t);

extern int	xfs_dev_is_read_only(struct xfs_mount *, char *);

extern void	xfs_set_low_space_thresholds(struct xfs_mount *);

int	xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
			xfs_off_t count_fsb);

struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
		int error_class, int error);
void xfs_force_summary_recalc(struct xfs_mount *mp);
int xfs_add_incompat_log_feature(struct xfs_mount *mp, uint32_t feature);
bool xfs_clear_incompat_log_features(struct xfs_mount *mp);
void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta);

#endif	/* __XFS_MOUNT_H__ */