xfs_mount.h revision 2e973b2c
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#ifndef __XFS_MOUNT_H__
7#define	__XFS_MOUNT_H__
8
9struct xlog;
10struct xfs_inode;
11struct xfs_mru_cache;
12struct xfs_ail;
13struct xfs_quotainfo;
14struct xfs_da_geometry;
15struct xfs_perag;
16
17/* dynamic preallocation free space thresholds, 5% down to 1% */
18enum {
19	XFS_LOWSP_1_PCNT = 0,
20	XFS_LOWSP_2_PCNT,
21	XFS_LOWSP_3_PCNT,
22	XFS_LOWSP_4_PCNT,
23	XFS_LOWSP_5_PCNT,
24	XFS_LOWSP_MAX,
25};
26
27/*
28 * Error Configuration
29 *
30 * Error classes define the subsystem the configuration belongs to.
31 * Error numbers define the errors that are configurable.
32 */
33enum {
34	XFS_ERR_METADATA,
35	XFS_ERR_CLASS_MAX,
36};
37enum {
38	XFS_ERR_DEFAULT,
39	XFS_ERR_EIO,
40	XFS_ERR_ENOSPC,
41	XFS_ERR_ENODEV,
42	XFS_ERR_ERRNO_MAX,
43};
44
45#define XFS_ERR_RETRY_FOREVER	-1
46
47/*
48 * Although retry_timeout is in jiffies which is normally an unsigned long,
49 * we limit the retry timeout to 86400 seconds, or one day.  So even a
50 * signed 32-bit long is sufficient for a HZ value up to 24855.  Making it
51 * signed lets us store the special "-1" value, meaning retry forever.
52 */
53struct xfs_error_cfg {
54	struct xfs_kobj	kobj;
55	int		max_retries;
56	long		retry_timeout;	/* in jiffies, -1 = infinite */
57};
58
59/*
60 * Per-cpu deferred inode inactivation GC lists.
61 */
62struct xfs_inodegc {
63	struct llist_head	list;
64	struct work_struct	work;
65
66	/* approximate count of inodes in the list */
67	unsigned int		items;
68	unsigned int		shrinker_hits;
69};
70
71/*
72 * The struct xfsmount layout is optimised to separate read-mostly variables
73 * from variables that are frequently modified. We put the read-mostly variables
74 * first, then place all the other variables at the end.
75 *
76 * Typically, read-mostly variables are those that are set at mount time and
77 * never changed again, or only change rarely as a result of things like sysfs
78 * knobs being tweaked.
79 */
80typedef struct xfs_mount {
81	struct xfs_sb		m_sb;		/* copy of fs superblock */
82	struct super_block	*m_super;
83	struct xfs_ail		*m_ail;		/* fs active log item list */
84	struct xfs_buf		*m_sb_bp;	/* buffer for superblock */
85	char			*m_rtname;	/* realtime device name */
86	char			*m_logname;	/* external log device name */
87	struct xfs_da_geometry	*m_dir_geo;	/* directory block geometry */
88	struct xfs_da_geometry	*m_attr_geo;	/* attribute block geometry */
89	struct xlog		*m_log;		/* log specific stuff */
90	struct xfs_inode	*m_rbmip;	/* pointer to bitmap inode */
91	struct xfs_inode	*m_rsumip;	/* pointer to summary inode */
92	struct xfs_inode	*m_rootip;	/* pointer to root directory */
93	struct xfs_quotainfo	*m_quotainfo;	/* disk quota information */
94	xfs_buftarg_t		*m_ddev_targp;	/* saves taking the address */
95	xfs_buftarg_t		*m_logdev_targp;/* ptr to log device */
96	xfs_buftarg_t		*m_rtdev_targp;	/* ptr to rt device */
97	struct list_head	m_mount_list;	/* global mount list */
98	void __percpu		*m_inodegc;	/* percpu inodegc structures */
99
100	/*
101	 * Optional cache of rt summary level per bitmap block with the
102	 * invariant that m_rsum_cache[bbno] <= the minimum i for which
103	 * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
104	 * inode lock.
105	 */
106	uint8_t			*m_rsum_cache;
107	struct xfs_mru_cache	*m_filestream;  /* per-mount filestream data */
108	struct workqueue_struct *m_buf_workqueue;
109	struct workqueue_struct	*m_unwritten_workqueue;
110	struct workqueue_struct	*m_reclaim_workqueue;
111	struct workqueue_struct	*m_sync_workqueue;
112	struct workqueue_struct *m_blockgc_wq;
113	struct workqueue_struct *m_inodegc_wq;
114
115	int			m_bsize;	/* fs logical block size */
116	uint8_t			m_blkbit_log;	/* blocklog + NBBY */
117	uint8_t			m_blkbb_log;	/* blocklog - BBSHIFT */
118	uint8_t			m_agno_log;	/* log #ag's */
119	uint8_t			m_sectbb_log;	/* sectlog - BBSHIFT */
120	uint			m_blockmask;	/* sb_blocksize-1 */
121	uint			m_blockwsize;	/* sb_blocksize in words */
122	uint			m_blockwmask;	/* blockwsize-1 */
123	uint			m_alloc_mxr[2];	/* max alloc btree records */
124	uint			m_alloc_mnr[2];	/* min alloc btree records */
125	uint			m_bmap_dmxr[2];	/* max bmap btree records */
126	uint			m_bmap_dmnr[2];	/* min bmap btree records */
127	uint			m_rmap_mxr[2];	/* max rmap btree records */
128	uint			m_rmap_mnr[2];	/* min rmap btree records */
129	uint			m_refc_mxr[2];	/* max refc btree records */
130	uint			m_refc_mnr[2];	/* min refc btree records */
131	uint			m_ag_maxlevels;	/* XFS_AG_MAXLEVELS */
132	uint			m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
133	uint			m_rmap_maxlevels; /* max rmap btree levels */
134	uint			m_refc_maxlevels; /* max refcount btree level */
135	xfs_extlen_t		m_ag_prealloc_blocks; /* reserved ag blocks */
136	uint			m_alloc_set_aside; /* space we can't use */
137	uint			m_ag_max_usable; /* max space per AG */
138	int			m_dalign;	/* stripe unit */
139	int			m_swidth;	/* stripe width */
140	xfs_agnumber_t		m_maxagi;	/* highest inode alloc group */
141	uint			m_allocsize_log;/* min write size log bytes */
142	uint			m_allocsize_blocks; /* min write size blocks */
143	int			m_logbufs;	/* number of log buffers */
144	int			m_logbsize;	/* size of each log buffer */
145	uint			m_rsumlevels;	/* rt summary levels */
146	uint			m_rsumsize;	/* size of rt summary, bytes */
147	int			m_fixedfsid[2];	/* unchanged for life of FS */
148	uint			m_qflags;	/* quota status flags */
149	uint64_t		m_features;	/* active filesystem features */
150	uint64_t		m_low_space[XFS_LOWSP_MAX];
151	uint64_t		m_low_rtexts[XFS_LOWSP_MAX];
152	struct xfs_ino_geometry	m_ino_geo;	/* inode geometry */
153	struct xfs_trans_resv	m_resv;		/* precomputed res values */
154						/* low free space thresholds */
155	unsigned long		m_opstate;	/* dynamic state flags */
156	bool			m_always_cow;
157	bool			m_fail_unmount;
158	bool			m_finobt_nores; /* no per-AG finobt resv. */
159	bool			m_update_sb;	/* sb needs update in mount */
160
161	/*
162	 * Bitsets of per-fs metadata that have been checked and/or are sick.
163	 * Callers must hold m_sb_lock to access these two fields.
164	 */
165	uint8_t			m_fs_checked;
166	uint8_t			m_fs_sick;
167	/*
168	 * Bitsets of rt metadata that have been checked and/or are sick.
169	 * Callers must hold m_sb_lock to access this field.
170	 */
171	uint8_t			m_rt_checked;
172	uint8_t			m_rt_sick;
173
174	/*
175	 * End of read-mostly variables. Frequently written variables and locks
176	 * should be placed below this comment from now on. The first variable
177	 * here is marked as cacheline aligned so they it is separated from
178	 * the read-mostly variables.
179	 */
180
181	spinlock_t ____cacheline_aligned m_sb_lock; /* sb counter lock */
182	struct percpu_counter	m_icount;	/* allocated inodes counter */
183	struct percpu_counter	m_ifree;	/* free inodes counter */
184	struct percpu_counter	m_fdblocks;	/* free block counter */
185	/*
186	 * Count of data device blocks reserved for delayed allocations,
187	 * including indlen blocks.  Does not include allocated CoW staging
188	 * extents or anything related to the rt device.
189	 */
190	struct percpu_counter	m_delalloc_blks;
191	/*
192	 * Global count of allocation btree blocks in use across all AGs. Only
193	 * used when perag reservation is enabled. Helps prevent block
194	 * reservation from attempting to reserve allocation btree blocks.
195	 */
196	atomic64_t		m_allocbt_blks;
197
198	struct radix_tree_root	m_perag_tree;	/* per-ag accounting info */
199	spinlock_t		m_perag_lock;	/* lock for m_perag_tree */
200	uint64_t		m_resblks;	/* total reserved blocks */
201	uint64_t		m_resblks_avail;/* available reserved blocks */
202	uint64_t		m_resblks_save;	/* reserved blks @ remount,ro */
203	struct delayed_work	m_reclaim_work;	/* background inode reclaim */
204	struct xfs_kobj		m_kobj;
205	struct xfs_kobj		m_error_kobj;
206	struct xfs_kobj		m_error_meta_kobj;
207	struct xfs_error_cfg	m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
208	struct xstats		m_stats;	/* per-fs stats */
209	xfs_agnumber_t		m_agfrotor;	/* last ag where space found */
210	xfs_agnumber_t		m_agirotor;	/* last ag dir inode alloced */
211	spinlock_t		m_agirotor_lock;/* .. and lock protecting it */
212
213	/* Memory shrinker to throttle and reprioritize inodegc */
214	struct shrinker		m_inodegc_shrinker;
215	/*
216	 * Workqueue item so that we can coalesce multiple inode flush attempts
217	 * into a single flush.
218	 */
219	struct work_struct	m_flush_inodes_work;
220
221	/*
222	 * Generation of the filesysyem layout.  This is incremented by each
223	 * growfs, and used by the pNFS server to ensure the client updates
224	 * its view of the block device once it gets a layout that might
225	 * reference the newly added blocks.  Does not need to be persistent
226	 * as long as we only allow file system size increments, but if we
227	 * ever support shrinks it would have to be persisted in addition
228	 * to various other kinds of pain inflicted on the pNFS server.
229	 */
230	uint32_t		m_generation;
231	struct mutex		m_growlock;	/* growfs mutex */
232
233#ifdef DEBUG
234	/*
235	 * Frequency with which errors are injected.  Replaces xfs_etest; the
236	 * value stored in here is the inverse of the frequency with which the
237	 * error triggers.  1 = always, 2 = half the time, etc.
238	 */
239	unsigned int		*m_errortag;
240	struct xfs_kobj		m_errortag_kobj;
241#endif
242} xfs_mount_t;
243
244#define M_IGEO(mp)		(&(mp)->m_ino_geo)
245
246/*
247 * Flags for m_features.
248 *
249 * These are all the active features in the filesystem, regardless of how
250 * they are configured.
251 */
252#define XFS_FEAT_ATTR		(1ULL << 0)	/* xattrs present in fs */
253#define XFS_FEAT_NLINK		(1ULL << 1)	/* 32 bit link counts */
254#define XFS_FEAT_QUOTA		(1ULL << 2)	/* quota active */
255#define XFS_FEAT_ALIGN		(1ULL << 3)	/* inode alignment */
256#define XFS_FEAT_DALIGN		(1ULL << 4)	/* data alignment */
257#define XFS_FEAT_LOGV2		(1ULL << 5)	/* version 2 logs */
258#define XFS_FEAT_SECTOR		(1ULL << 6)	/* sector size > 512 bytes */
259#define XFS_FEAT_EXTFLG		(1ULL << 7)	/* unwritten extents */
260#define XFS_FEAT_ASCIICI	(1ULL << 8)	/* ASCII only case-insens. */
261#define XFS_FEAT_LAZYSBCOUNT	(1ULL << 9)	/* Superblk counters */
262#define XFS_FEAT_ATTR2		(1ULL << 10)	/* dynamic attr fork */
263#define XFS_FEAT_PARENT		(1ULL << 11)	/* parent pointers */
264#define XFS_FEAT_PROJID32	(1ULL << 12)	/* 32 bit project id */
265#define XFS_FEAT_CRC		(1ULL << 13)	/* metadata CRCs */
266#define XFS_FEAT_V3INODES	(1ULL << 14)	/* Version 3 inodes */
267#define XFS_FEAT_PQUOTINO	(1ULL << 15)	/* non-shared proj/grp quotas */
268#define XFS_FEAT_FTYPE		(1ULL << 16)	/* inode type in dir */
269#define XFS_FEAT_FINOBT		(1ULL << 17)	/* free inode btree */
270#define XFS_FEAT_RMAPBT		(1ULL << 18)	/* reverse map btree */
271#define XFS_FEAT_REFLINK	(1ULL << 19)	/* reflinked files */
272#define XFS_FEAT_SPINODES	(1ULL << 20)	/* sparse inode chunks */
273#define XFS_FEAT_META_UUID	(1ULL << 21)	/* metadata UUID */
274#define XFS_FEAT_REALTIME	(1ULL << 22)	/* realtime device present */
275#define XFS_FEAT_INOBTCNT	(1ULL << 23)	/* inobt block counts */
276#define XFS_FEAT_BIGTIME	(1ULL << 24)	/* large timestamps */
277#define XFS_FEAT_NEEDSREPAIR	(1ULL << 25)	/* needs xfs_repair */
278
279/* Mount features */
280#define XFS_FEAT_NOATTR2	(1ULL << 48)	/* disable attr2 creation */
281#define XFS_FEAT_NOALIGN	(1ULL << 49)	/* ignore alignment */
282#define XFS_FEAT_ALLOCSIZE	(1ULL << 50)	/* user specified allocation size */
283#define XFS_FEAT_LARGE_IOSIZE	(1ULL << 51)	/* report large preferred
284						 * I/O size in stat() */
285#define XFS_FEAT_WSYNC		(1ULL << 52)	/* synchronous metadata ops */
286#define XFS_FEAT_DIRSYNC	(1ULL << 53)	/* synchronous directory ops */
287#define XFS_FEAT_DISCARD	(1ULL << 54)	/* discard unused blocks */
288#define XFS_FEAT_GRPID		(1ULL << 55)	/* group-ID assigned from directory */
289#define XFS_FEAT_SMALL_INUMS	(1ULL << 56)	/* user wants 32bit inodes */
290#define XFS_FEAT_IKEEP		(1ULL << 57)	/* keep empty inode clusters*/
291#define XFS_FEAT_SWALLOC	(1ULL << 58)	/* stripe width allocation */
292#define XFS_FEAT_FILESTREAMS	(1ULL << 59)	/* use filestreams allocator */
293#define XFS_FEAT_DAX_ALWAYS	(1ULL << 60)	/* DAX always enabled */
294#define XFS_FEAT_DAX_NEVER	(1ULL << 61)	/* DAX never enabled */
295#define XFS_FEAT_NORECOVERY	(1ULL << 62)	/* no recovery - dirty fs */
296#define XFS_FEAT_NOUUID		(1ULL << 63)	/* ignore uuid during mount */
297
298#define __XFS_HAS_FEAT(name, NAME) \
299static inline bool xfs_has_ ## name (struct xfs_mount *mp) \
300{ \
301	return mp->m_features & XFS_FEAT_ ## NAME; \
302}
303
304/* Some features can be added dynamically so they need a set wrapper, too. */
305#define __XFS_ADD_FEAT(name, NAME) \
306	__XFS_HAS_FEAT(name, NAME); \
307static inline void xfs_add_ ## name (struct xfs_mount *mp) \
308{ \
309	mp->m_features |= XFS_FEAT_ ## NAME; \
310	xfs_sb_version_add ## name(&mp->m_sb); \
311}
312
313/* Superblock features */
314__XFS_ADD_FEAT(attr, ATTR)
315__XFS_HAS_FEAT(nlink, NLINK)
316__XFS_ADD_FEAT(quota, QUOTA)
317__XFS_HAS_FEAT(align, ALIGN)
318__XFS_HAS_FEAT(dalign, DALIGN)
319__XFS_HAS_FEAT(logv2, LOGV2)
320__XFS_HAS_FEAT(sector, SECTOR)
321__XFS_HAS_FEAT(extflg, EXTFLG)
322__XFS_HAS_FEAT(asciici, ASCIICI)
323__XFS_HAS_FEAT(lazysbcount, LAZYSBCOUNT)
324__XFS_ADD_FEAT(attr2, ATTR2)
325__XFS_HAS_FEAT(parent, PARENT)
326__XFS_ADD_FEAT(projid32, PROJID32)
327__XFS_HAS_FEAT(crc, CRC)
328__XFS_HAS_FEAT(v3inodes, V3INODES)
329__XFS_HAS_FEAT(pquotino, PQUOTINO)
330__XFS_HAS_FEAT(ftype, FTYPE)
331__XFS_HAS_FEAT(finobt, FINOBT)
332__XFS_HAS_FEAT(rmapbt, RMAPBT)
333__XFS_HAS_FEAT(reflink, REFLINK)
334__XFS_HAS_FEAT(sparseinodes, SPINODES)
335__XFS_HAS_FEAT(metauuid, META_UUID)
336__XFS_HAS_FEAT(realtime, REALTIME)
337__XFS_HAS_FEAT(inobtcounts, INOBTCNT)
338__XFS_HAS_FEAT(bigtime, BIGTIME)
339__XFS_HAS_FEAT(needsrepair, NEEDSREPAIR)
340
341/*
342 * Mount features
343 *
344 * These do not change dynamically - features that can come and go, such as 32
345 * bit inodes and read-only state, are kept as operational state rather than
346 * features.
347 */
348__XFS_HAS_FEAT(noattr2, NOATTR2)
349__XFS_HAS_FEAT(noalign, NOALIGN)
350__XFS_HAS_FEAT(allocsize, ALLOCSIZE)
351__XFS_HAS_FEAT(large_iosize, LARGE_IOSIZE)
352__XFS_HAS_FEAT(wsync, WSYNC)
353__XFS_HAS_FEAT(dirsync, DIRSYNC)
354__XFS_HAS_FEAT(discard, DISCARD)
355__XFS_HAS_FEAT(grpid, GRPID)
356__XFS_HAS_FEAT(small_inums, SMALL_INUMS)
357__XFS_HAS_FEAT(ikeep, IKEEP)
358__XFS_HAS_FEAT(swalloc, SWALLOC)
359__XFS_HAS_FEAT(filestreams, FILESTREAMS)
360__XFS_HAS_FEAT(dax_always, DAX_ALWAYS)
361__XFS_HAS_FEAT(dax_never, DAX_NEVER)
362__XFS_HAS_FEAT(norecovery, NORECOVERY)
363__XFS_HAS_FEAT(nouuid, NOUUID)
364
365/*
366 * Operational mount state flags
367 *
368 * Use these with atomic bit ops only!
369 */
370#define XFS_OPSTATE_UNMOUNTING		0	/* filesystem is unmounting */
371#define XFS_OPSTATE_CLEAN		1	/* mount was clean */
372#define XFS_OPSTATE_SHUTDOWN		2	/* stop all fs operations */
373#define XFS_OPSTATE_INODE32		3	/* inode32 allocator active */
374#define XFS_OPSTATE_READONLY		4	/* read-only fs */
375
376/*
377 * If set, inactivation worker threads will be scheduled to process queued
378 * inodegc work.  If not, queued inodes remain in memory waiting to be
379 * processed.
380 */
381#define XFS_OPSTATE_INODEGC_ENABLED	5
382/*
383 * If set, background speculative prealloc gc worker threads will be scheduled
384 * to process queued blockgc work.  If not, inodes retain their preallocations
385 * until explicitly deleted.
386 */
387#define XFS_OPSTATE_BLOCKGC_ENABLED	6
388
389#define __XFS_IS_OPSTATE(name, NAME) \
390static inline bool xfs_is_ ## name (struct xfs_mount *mp) \
391{ \
392	return test_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
393} \
394static inline bool xfs_clear_ ## name (struct xfs_mount *mp) \
395{ \
396	return test_and_clear_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
397} \
398static inline bool xfs_set_ ## name (struct xfs_mount *mp) \
399{ \
400	return test_and_set_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
401}
402
403__XFS_IS_OPSTATE(unmounting, UNMOUNTING)
404__XFS_IS_OPSTATE(clean, CLEAN)
405__XFS_IS_OPSTATE(shutdown, SHUTDOWN)
406__XFS_IS_OPSTATE(inode32, INODE32)
407__XFS_IS_OPSTATE(readonly, READONLY)
408__XFS_IS_OPSTATE(inodegc_enabled, INODEGC_ENABLED)
409__XFS_IS_OPSTATE(blockgc_enabled, BLOCKGC_ENABLED)
410
411#define XFS_OPSTATE_STRINGS \
412	{ (1UL << XFS_OPSTATE_UNMOUNTING),		"unmounting" }, \
413	{ (1UL << XFS_OPSTATE_CLEAN),			"clean" }, \
414	{ (1UL << XFS_OPSTATE_SHUTDOWN),		"shutdown" }, \
415	{ (1UL << XFS_OPSTATE_INODE32),			"inode32" }, \
416	{ (1UL << XFS_OPSTATE_READONLY),		"read_only" }, \
417	{ (1UL << XFS_OPSTATE_INODEGC_ENABLED),		"inodegc" }, \
418	{ (1UL << XFS_OPSTATE_BLOCKGC_ENABLED),		"blockgc" }
419
420/*
421 * Max and min values for mount-option defined I/O
422 * preallocation sizes.
423 */
424#define XFS_MAX_IO_LOG		30	/* 1G */
425#define XFS_MIN_IO_LOG		PAGE_SHIFT
426
427#define XFS_FORCED_SHUTDOWN(mp)		xfs_is_shutdown(mp)
428void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
429		int lnnum);
430#define xfs_force_shutdown(m,f)	\
431	xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
432
433#define SHUTDOWN_META_IO_ERROR	0x0001	/* write attempt to metadata failed */
434#define SHUTDOWN_LOG_IO_ERROR	0x0002	/* write attempt to the log failed */
435#define SHUTDOWN_FORCE_UMOUNT	0x0004	/* shutdown from a forced unmount */
436#define SHUTDOWN_CORRUPT_INCORE	0x0008	/* corrupt in-memory data structures */
437
438#define XFS_SHUTDOWN_STRINGS \
439	{ SHUTDOWN_META_IO_ERROR,	"metadata_io" }, \
440	{ SHUTDOWN_LOG_IO_ERROR,	"log_io" }, \
441	{ SHUTDOWN_FORCE_UMOUNT,	"force_umount" }, \
442	{ SHUTDOWN_CORRUPT_INCORE,	"corruption" }
443
444/*
445 * Flags for xfs_mountfs
446 */
447#define XFS_MFSI_QUIET		0x40	/* Be silent if mount errors found */
448
449static inline xfs_agnumber_t
450xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
451{
452	xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
453	do_div(ld, mp->m_sb.sb_agblocks);
454	return (xfs_agnumber_t) ld;
455}
456
457static inline xfs_agblock_t
458xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
459{
460	xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
461	return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
462}
463
464int xfs_buf_hash_init(struct xfs_perag *pag);
465void xfs_buf_hash_destroy(struct xfs_perag *pag);
466
467extern void	xfs_uuid_table_free(void);
468extern uint64_t xfs_default_resblks(xfs_mount_t *mp);
469extern int	xfs_mountfs(xfs_mount_t *mp);
470extern void	xfs_unmountfs(xfs_mount_t *);
471
472/*
473 * Deltas for the block count can vary from 1 to very large, but lock contention
474 * only occurs on frequent small block count updates such as in the delayed
475 * allocation path for buffered writes (page a time updates). Hence we set
476 * a large batch count (1024) to minimise global counter updates except when
477 * we get near to ENOSPC and we have to be very accurate with our updates.
478 */
479#define XFS_FDBLOCKS_BATCH	1024
480
481extern int	xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
482				 bool reserved);
483extern int	xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
484
485extern int	xfs_readsb(xfs_mount_t *, int);
486extern void	xfs_freesb(xfs_mount_t *);
487extern bool	xfs_fs_writable(struct xfs_mount *mp, int level);
488extern int	xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t);
489
490extern int	xfs_dev_is_read_only(struct xfs_mount *, char *);
491
492extern void	xfs_set_low_space_thresholds(struct xfs_mount *);
493
494int	xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
495			xfs_off_t count_fsb);
496
497struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
498		int error_class, int error);
499void xfs_force_summary_recalc(struct xfs_mount *mp);
500int xfs_add_incompat_log_feature(struct xfs_mount *mp, uint32_t feature);
501bool xfs_clear_incompat_log_features(struct xfs_mount *mp);
502void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta);
503
504#endif	/* __XFS_MOUNT_H__ */
505