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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 
9 struct xlog;
10 struct xfs_inode;
11 struct xfs_mru_cache;
12 struct xfs_ail;
13 struct xfs_quotainfo;
14 struct xfs_da_geometry;
15 struct xfs_perag;
16 
17 /* dynamic preallocation free space thresholds, 5% down to 1% */
18 enum {
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  */
33 enum {
34 	XFS_ERR_METADATA,
35 	XFS_ERR_CLASS_MAX,
36 };
37 enum {
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  */
53 struct 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  */
62 struct xfs_inodegc {
63 	struct llist_head	list;
64 	struct delayed_work	work;
65 
66 	/* approximate count of inodes in the list */
67 	unsigned int		items;
68 	unsigned int		shrinker_hits;
69 #if defined(DEBUG) || defined(XFS_WARN)
70 	unsigned int		cpu;
71 #endif
72 };
73 
74 /*
75  * The struct xfsmount layout is optimised to separate read-mostly variables
76  * from variables that are frequently modified. We put the read-mostly variables
77  * first, then place all the other variables at the end.
78  *
79  * Typically, read-mostly variables are those that are set at mount time and
80  * never changed again, or only change rarely as a result of things like sysfs
81  * knobs being tweaked.
82  */
83 typedef struct xfs_mount {
84 	struct xfs_sb		m_sb;		/* copy of fs superblock */
85 	struct super_block	*m_super;
86 	struct xfs_ail		*m_ail;		/* fs active log item list */
87 	struct xfs_buf		*m_sb_bp;	/* buffer for superblock */
88 	char			*m_rtname;	/* realtime device name */
89 	char			*m_logname;	/* external log device name */
90 	struct xfs_da_geometry	*m_dir_geo;	/* directory block geometry */
91 	struct xfs_da_geometry	*m_attr_geo;	/* attribute block geometry */
92 	struct xlog		*m_log;		/* log specific stuff */
93 	struct xfs_inode	*m_rbmip;	/* pointer to bitmap inode */
94 	struct xfs_inode	*m_rsumip;	/* pointer to summary inode */
95 	struct xfs_inode	*m_rootip;	/* pointer to root directory */
96 	struct xfs_quotainfo	*m_quotainfo;	/* disk quota information */
97 	xfs_buftarg_t		*m_ddev_targp;	/* saves taking the address */
98 	xfs_buftarg_t		*m_logdev_targp;/* ptr to log device */
99 	xfs_buftarg_t		*m_rtdev_targp;	/* ptr to rt device */
100 	struct list_head	m_mount_list;	/* global mount list */
101 	void __percpu		*m_inodegc;	/* percpu inodegc structures */
102 
103 	/*
104 	 * Optional cache of rt summary level per bitmap block with the
105 	 * invariant that m_rsum_cache[bbno] <= the minimum i for which
106 	 * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
107 	 * inode lock.
108 	 */
109 	uint8_t			*m_rsum_cache;
110 	struct xfs_mru_cache	*m_filestream;  /* per-mount filestream data */
111 	struct workqueue_struct *m_buf_workqueue;
112 	struct workqueue_struct	*m_unwritten_workqueue;
113 	struct workqueue_struct	*m_reclaim_workqueue;
114 	struct workqueue_struct	*m_sync_workqueue;
115 	struct workqueue_struct *m_blockgc_wq;
116 	struct workqueue_struct *m_inodegc_wq;
117 
118 	int			m_bsize;	/* fs logical block size */
119 	uint8_t			m_blkbit_log;	/* blocklog + NBBY */
120 	uint8_t			m_blkbb_log;	/* blocklog - BBSHIFT */
121 	uint8_t			m_agno_log;	/* log #ag's */
122 	uint8_t			m_sectbb_log;	/* sectlog - BBSHIFT */
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_alloc_maxlevels; /* max alloc btree levels */
135 	uint			m_bm_maxlevels[2]; /* max bmap btree levels */
136 	uint			m_rmap_maxlevels; /* max rmap btree levels */
137 	uint			m_refc_maxlevels; /* max refcount btree level */
138 	unsigned int		m_agbtree_maxlevels; /* max level of all AG btrees */
139 	xfs_extlen_t		m_ag_prealloc_blocks; /* reserved ag blocks */
140 	uint			m_alloc_set_aside; /* space we can't use */
141 	uint			m_ag_max_usable; /* max space per AG */
142 	int			m_dalign;	/* stripe unit */
143 	int			m_swidth;	/* stripe width */
144 	xfs_agnumber_t		m_maxagi;	/* highest inode alloc group */
145 	uint			m_allocsize_log;/* min write size log bytes */
146 	uint			m_allocsize_blocks; /* min write size blocks */
147 	int			m_logbufs;	/* number of log buffers */
148 	int			m_logbsize;	/* size of each log buffer */
149 	uint			m_rsumlevels;	/* rt summary levels */
150 	uint			m_rsumsize;	/* size of rt summary, bytes */
151 	int			m_fixedfsid[2];	/* unchanged for life of FS */
152 	uint			m_qflags;	/* quota status flags */
153 	uint64_t		m_features;	/* active filesystem features */
154 	uint64_t		m_low_space[XFS_LOWSP_MAX];
155 	uint64_t		m_low_rtexts[XFS_LOWSP_MAX];
156 	struct xfs_ino_geometry	m_ino_geo;	/* inode geometry */
157 	struct xfs_trans_resv	m_resv;		/* precomputed res values */
158 						/* low free space thresholds */
159 	unsigned long		m_opstate;	/* dynamic state flags */
160 	bool			m_always_cow;
161 	bool			m_fail_unmount;
162 	bool			m_finobt_nores; /* no per-AG finobt resv. */
163 	bool			m_update_sb;	/* sb needs update in mount */
164 
165 	/*
166 	 * Bitsets of per-fs metadata that have been checked and/or are sick.
167 	 * Callers must hold m_sb_lock to access these two fields.
168 	 */
169 	uint8_t			m_fs_checked;
170 	uint8_t			m_fs_sick;
171 	/*
172 	 * Bitsets of rt metadata that have been checked and/or are sick.
173 	 * Callers must hold m_sb_lock to access this field.
174 	 */
175 	uint8_t			m_rt_checked;
176 	uint8_t			m_rt_sick;
177 
178 	/*
179 	 * End of read-mostly variables. Frequently written variables and locks
180 	 * should be placed below this comment from now on. The first variable
181 	 * here is marked as cacheline aligned so they it is separated from
182 	 * the read-mostly variables.
183 	 */
184 
185 	spinlock_t ____cacheline_aligned m_sb_lock; /* sb counter lock */
186 	struct percpu_counter	m_icount;	/* allocated inodes counter */
187 	struct percpu_counter	m_ifree;	/* free inodes counter */
188 	struct percpu_counter	m_fdblocks;	/* free block counter */
189 	struct percpu_counter	m_frextents;	/* free rt extent counter */
190 
191 	/*
192 	 * Count of data device blocks reserved for delayed allocations,
193 	 * including indlen blocks.  Does not include allocated CoW staging
194 	 * extents or anything related to the rt device.
195 	 */
196 	struct percpu_counter	m_delalloc_blks;
197 	/*
198 	 * Global count of allocation btree blocks in use across all AGs. Only
199 	 * used when perag reservation is enabled. Helps prevent block
200 	 * reservation from attempting to reserve allocation btree blocks.
201 	 */
202 	atomic64_t		m_allocbt_blks;
203 
204 	struct radix_tree_root	m_perag_tree;	/* per-ag accounting info */
205 	spinlock_t		m_perag_lock;	/* lock for m_perag_tree */
206 	uint64_t		m_resblks;	/* total reserved blocks */
207 	uint64_t		m_resblks_avail;/* available reserved blocks */
208 	uint64_t		m_resblks_save;	/* reserved blks @ remount,ro */
209 	struct delayed_work	m_reclaim_work;	/* background inode reclaim */
210 	struct xfs_kobj		m_kobj;
211 	struct xfs_kobj		m_error_kobj;
212 	struct xfs_kobj		m_error_meta_kobj;
213 	struct xfs_error_cfg	m_error_cfg[XFS_ERR_CLASS_MAX][XFS_ERR_ERRNO_MAX];
214 	struct xstats		m_stats;	/* per-fs stats */
215 	xfs_agnumber_t		m_agfrotor;	/* last ag where space found */
216 	xfs_agnumber_t		m_agirotor;	/* last ag dir inode alloced */
217 	spinlock_t		m_agirotor_lock;/* .. and lock protecting it */
218 
219 	/* Memory shrinker to throttle and reprioritize inodegc */
220 	struct shrinker		m_inodegc_shrinker;
221 	/*
222 	 * Workqueue item so that we can coalesce multiple inode flush attempts
223 	 * into a single flush.
224 	 */
225 	struct work_struct	m_flush_inodes_work;
226 
227 	/*
228 	 * Generation of the filesysyem layout.  This is incremented by each
229 	 * growfs, and used by the pNFS server to ensure the client updates
230 	 * its view of the block device once it gets a layout that might
231 	 * reference the newly added blocks.  Does not need to be persistent
232 	 * as long as we only allow file system size increments, but if we
233 	 * ever support shrinks it would have to be persisted in addition
234 	 * to various other kinds of pain inflicted on the pNFS server.
235 	 */
236 	uint32_t		m_generation;
237 	struct mutex		m_growlock;	/* growfs mutex */
238 
239 #ifdef DEBUG
240 	/*
241 	 * Frequency with which errors are injected.  Replaces xfs_etest; the
242 	 * value stored in here is the inverse of the frequency with which the
243 	 * error triggers.  1 = always, 2 = half the time, etc.
244 	 */
245 	unsigned int		*m_errortag;
246 	struct xfs_kobj		m_errortag_kobj;
247 #endif
248 } xfs_mount_t;
249 
250 #define M_IGEO(mp)		(&(mp)->m_ino_geo)
251 
252 /*
253  * Flags for m_features.
254  *
255  * These are all the active features in the filesystem, regardless of how
256  * they are configured.
257  */
258 #define XFS_FEAT_ATTR		(1ULL << 0)	/* xattrs present in fs */
259 #define XFS_FEAT_NLINK		(1ULL << 1)	/* 32 bit link counts */
260 #define XFS_FEAT_QUOTA		(1ULL << 2)	/* quota active */
261 #define XFS_FEAT_ALIGN		(1ULL << 3)	/* inode alignment */
262 #define XFS_FEAT_DALIGN		(1ULL << 4)	/* data alignment */
263 #define XFS_FEAT_LOGV2		(1ULL << 5)	/* version 2 logs */
264 #define XFS_FEAT_SECTOR		(1ULL << 6)	/* sector size > 512 bytes */
265 #define XFS_FEAT_EXTFLG		(1ULL << 7)	/* unwritten extents */
266 #define XFS_FEAT_ASCIICI	(1ULL << 8)	/* ASCII only case-insens. */
267 #define XFS_FEAT_LAZYSBCOUNT	(1ULL << 9)	/* Superblk counters */
268 #define XFS_FEAT_ATTR2		(1ULL << 10)	/* dynamic attr fork */
269 #define XFS_FEAT_PARENT		(1ULL << 11)	/* parent pointers */
270 #define XFS_FEAT_PROJID32	(1ULL << 12)	/* 32 bit project id */
271 #define XFS_FEAT_CRC		(1ULL << 13)	/* metadata CRCs */
272 #define XFS_FEAT_V3INODES	(1ULL << 14)	/* Version 3 inodes */
273 #define XFS_FEAT_PQUOTINO	(1ULL << 15)	/* non-shared proj/grp quotas */
274 #define XFS_FEAT_FTYPE		(1ULL << 16)	/* inode type in dir */
275 #define XFS_FEAT_FINOBT		(1ULL << 17)	/* free inode btree */
276 #define XFS_FEAT_RMAPBT		(1ULL << 18)	/* reverse map btree */
277 #define XFS_FEAT_REFLINK	(1ULL << 19)	/* reflinked files */
278 #define XFS_FEAT_SPINODES	(1ULL << 20)	/* sparse inode chunks */
279 #define XFS_FEAT_META_UUID	(1ULL << 21)	/* metadata UUID */
280 #define XFS_FEAT_REALTIME	(1ULL << 22)	/* realtime device present */
281 #define XFS_FEAT_INOBTCNT	(1ULL << 23)	/* inobt block counts */
282 #define XFS_FEAT_BIGTIME	(1ULL << 24)	/* large timestamps */
283 #define XFS_FEAT_NEEDSREPAIR	(1ULL << 25)	/* needs xfs_repair */
284 #define XFS_FEAT_NREXT64	(1ULL << 26)	/* large extent counters */
285 
286 /* Mount features */
287 #define XFS_FEAT_NOATTR2	(1ULL << 48)	/* disable attr2 creation */
288 #define XFS_FEAT_NOALIGN	(1ULL << 49)	/* ignore alignment */
289 #define XFS_FEAT_ALLOCSIZE	(1ULL << 50)	/* user specified allocation size */
290 #define XFS_FEAT_LARGE_IOSIZE	(1ULL << 51)	/* report large preferred
291 						 * I/O size in stat() */
292 #define XFS_FEAT_WSYNC		(1ULL << 52)	/* synchronous metadata ops */
293 #define XFS_FEAT_DIRSYNC	(1ULL << 53)	/* synchronous directory ops */
294 #define XFS_FEAT_DISCARD	(1ULL << 54)	/* discard unused blocks */
295 #define XFS_FEAT_GRPID		(1ULL << 55)	/* group-ID assigned from directory */
296 #define XFS_FEAT_SMALL_INUMS	(1ULL << 56)	/* user wants 32bit inodes */
297 #define XFS_FEAT_IKEEP		(1ULL << 57)	/* keep empty inode clusters*/
298 #define XFS_FEAT_SWALLOC	(1ULL << 58)	/* stripe width allocation */
299 #define XFS_FEAT_FILESTREAMS	(1ULL << 59)	/* use filestreams allocator */
300 #define XFS_FEAT_DAX_ALWAYS	(1ULL << 60)	/* DAX always enabled */
301 #define XFS_FEAT_DAX_NEVER	(1ULL << 61)	/* DAX never enabled */
302 #define XFS_FEAT_NORECOVERY	(1ULL << 62)	/* no recovery - dirty fs */
303 #define XFS_FEAT_NOUUID		(1ULL << 63)	/* ignore uuid during mount */
304 
305 #define __XFS_HAS_FEAT(name, NAME) \
306 static inline bool xfs_has_ ## name (struct xfs_mount *mp) \
307 { \
308 	return mp->m_features & XFS_FEAT_ ## NAME; \
309 }
310 
311 /* Some features can be added dynamically so they need a set wrapper, too. */
312 #define __XFS_ADD_FEAT(name, NAME) \
313 	__XFS_HAS_FEAT(name, NAME); \
314 static inline void xfs_add_ ## name (struct xfs_mount *mp) \
315 { \
316 	mp->m_features |= XFS_FEAT_ ## NAME; \
317 	xfs_sb_version_add ## name(&mp->m_sb); \
318 }
319 
320 /* Superblock features */
__XFS_ADD_FEAT(attr,ATTR)321 __XFS_ADD_FEAT(attr, ATTR)
322 __XFS_HAS_FEAT(nlink, NLINK)
323 __XFS_ADD_FEAT(quota, QUOTA)
324 __XFS_HAS_FEAT(align, ALIGN)
325 __XFS_HAS_FEAT(dalign, DALIGN)
326 __XFS_HAS_FEAT(logv2, LOGV2)
327 __XFS_HAS_FEAT(sector, SECTOR)
328 __XFS_HAS_FEAT(extflg, EXTFLG)
329 __XFS_HAS_FEAT(asciici, ASCIICI)
330 __XFS_HAS_FEAT(lazysbcount, LAZYSBCOUNT)
331 __XFS_ADD_FEAT(attr2, ATTR2)
332 __XFS_HAS_FEAT(parent, PARENT)
333 __XFS_ADD_FEAT(projid32, PROJID32)
334 __XFS_HAS_FEAT(crc, CRC)
335 __XFS_HAS_FEAT(v3inodes, V3INODES)
336 __XFS_HAS_FEAT(pquotino, PQUOTINO)
337 __XFS_HAS_FEAT(ftype, FTYPE)
338 __XFS_HAS_FEAT(finobt, FINOBT)
339 __XFS_HAS_FEAT(rmapbt, RMAPBT)
340 __XFS_HAS_FEAT(reflink, REFLINK)
341 __XFS_HAS_FEAT(sparseinodes, SPINODES)
342 __XFS_HAS_FEAT(metauuid, META_UUID)
343 __XFS_HAS_FEAT(realtime, REALTIME)
344 __XFS_HAS_FEAT(inobtcounts, INOBTCNT)
345 __XFS_HAS_FEAT(bigtime, BIGTIME)
346 __XFS_HAS_FEAT(needsrepair, NEEDSREPAIR)
347 __XFS_HAS_FEAT(large_extent_counts, NREXT64)
348 
349 /*
350  * Mount features
351  *
352  * These do not change dynamically - features that can come and go, such as 32
353  * bit inodes and read-only state, are kept as operational state rather than
354  * features.
355  */
356 __XFS_HAS_FEAT(noattr2, NOATTR2)
357 __XFS_HAS_FEAT(noalign, NOALIGN)
358 __XFS_HAS_FEAT(allocsize, ALLOCSIZE)
359 __XFS_HAS_FEAT(large_iosize, LARGE_IOSIZE)
360 __XFS_HAS_FEAT(wsync, WSYNC)
361 __XFS_HAS_FEAT(dirsync, DIRSYNC)
362 __XFS_HAS_FEAT(discard, DISCARD)
363 __XFS_HAS_FEAT(grpid, GRPID)
364 __XFS_HAS_FEAT(small_inums, SMALL_INUMS)
365 __XFS_HAS_FEAT(ikeep, IKEEP)
366 __XFS_HAS_FEAT(swalloc, SWALLOC)
367 __XFS_HAS_FEAT(filestreams, FILESTREAMS)
368 __XFS_HAS_FEAT(dax_always, DAX_ALWAYS)
369 __XFS_HAS_FEAT(dax_never, DAX_NEVER)
370 __XFS_HAS_FEAT(norecovery, NORECOVERY)
371 __XFS_HAS_FEAT(nouuid, NOUUID)
372 
373 /*
374  * Operational mount state flags
375  *
376  * Use these with atomic bit ops only!
377  */
378 #define XFS_OPSTATE_UNMOUNTING		0	/* filesystem is unmounting */
379 #define XFS_OPSTATE_CLEAN		1	/* mount was clean */
380 #define XFS_OPSTATE_SHUTDOWN		2	/* stop all fs operations */
381 #define XFS_OPSTATE_INODE32		3	/* inode32 allocator active */
382 #define XFS_OPSTATE_READONLY		4	/* read-only fs */
383 
384 /*
385  * If set, inactivation worker threads will be scheduled to process queued
386  * inodegc work.  If not, queued inodes remain in memory waiting to be
387  * processed.
388  */
389 #define XFS_OPSTATE_INODEGC_ENABLED	5
390 /*
391  * If set, background speculative prealloc gc worker threads will be scheduled
392  * to process queued blockgc work.  If not, inodes retain their preallocations
393  * until explicitly deleted.
394  */
395 #define XFS_OPSTATE_BLOCKGC_ENABLED	6
396 
397 /* Kernel has logged a warning about online fsck being used on this fs. */
398 #define XFS_OPSTATE_WARNED_SCRUB	7
399 /* Kernel has logged a warning about shrink being used on this fs. */
400 #define XFS_OPSTATE_WARNED_SHRINK	8
401 /* Kernel has logged a warning about logged xattr updates being used. */
402 #define XFS_OPSTATE_WARNED_LARP		9
403 
404 #define __XFS_IS_OPSTATE(name, NAME) \
405 static inline bool xfs_is_ ## name (struct xfs_mount *mp) \
406 { \
407 	return test_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
408 } \
409 static inline bool xfs_clear_ ## name (struct xfs_mount *mp) \
410 { \
411 	return test_and_clear_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
412 } \
413 static inline bool xfs_set_ ## name (struct xfs_mount *mp) \
414 { \
415 	return test_and_set_bit(XFS_OPSTATE_ ## NAME, &mp->m_opstate); \
416 }
417 
418 __XFS_IS_OPSTATE(unmounting, UNMOUNTING)
419 __XFS_IS_OPSTATE(clean, CLEAN)
420 __XFS_IS_OPSTATE(shutdown, SHUTDOWN)
421 __XFS_IS_OPSTATE(inode32, INODE32)
422 __XFS_IS_OPSTATE(readonly, READONLY)
423 __XFS_IS_OPSTATE(inodegc_enabled, INODEGC_ENABLED)
424 __XFS_IS_OPSTATE(blockgc_enabled, BLOCKGC_ENABLED)
425 
426 static inline bool
427 xfs_should_warn(struct xfs_mount *mp, long nr)
428 {
429 	return !test_and_set_bit(nr, &mp->m_opstate);
430 }
431 
432 #define XFS_OPSTATE_STRINGS \
433 	{ (1UL << XFS_OPSTATE_UNMOUNTING),		"unmounting" }, \
434 	{ (1UL << XFS_OPSTATE_CLEAN),			"clean" }, \
435 	{ (1UL << XFS_OPSTATE_SHUTDOWN),		"shutdown" }, \
436 	{ (1UL << XFS_OPSTATE_INODE32),			"inode32" }, \
437 	{ (1UL << XFS_OPSTATE_READONLY),		"read_only" }, \
438 	{ (1UL << XFS_OPSTATE_INODEGC_ENABLED),		"inodegc" }, \
439 	{ (1UL << XFS_OPSTATE_BLOCKGC_ENABLED),		"blockgc" }, \
440 	{ (1UL << XFS_OPSTATE_WARNED_SCRUB),		"wscrub" }, \
441 	{ (1UL << XFS_OPSTATE_WARNED_SHRINK),		"wshrink" }, \
442 	{ (1UL << XFS_OPSTATE_WARNED_LARP),		"wlarp" }
443 
444 /*
445  * Max and min values for mount-option defined I/O
446  * preallocation sizes.
447  */
448 #define XFS_MAX_IO_LOG		30	/* 1G */
449 #define XFS_MIN_IO_LOG		PAGE_SHIFT
450 
451 void xfs_do_force_shutdown(struct xfs_mount *mp, uint32_t flags, char *fname,
452 		int lnnum);
453 #define xfs_force_shutdown(m,f)	\
454 	xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
455 
456 #define SHUTDOWN_META_IO_ERROR	(1u << 0) /* write attempt to metadata failed */
457 #define SHUTDOWN_LOG_IO_ERROR	(1u << 1) /* write attempt to the log failed */
458 #define SHUTDOWN_FORCE_UMOUNT	(1u << 2) /* shutdown from a forced unmount */
459 #define SHUTDOWN_CORRUPT_INCORE	(1u << 3) /* corrupt in-memory structures */
460 #define SHUTDOWN_CORRUPT_ONDISK	(1u << 4)  /* corrupt metadata on device */
461 
462 #define XFS_SHUTDOWN_STRINGS \
463 	{ SHUTDOWN_META_IO_ERROR,	"metadata_io" }, \
464 	{ SHUTDOWN_LOG_IO_ERROR,	"log_io" }, \
465 	{ SHUTDOWN_FORCE_UMOUNT,	"force_umount" }, \
466 	{ SHUTDOWN_CORRUPT_INCORE,	"corruption" }
467 
468 /*
469  * Flags for xfs_mountfs
470  */
471 #define XFS_MFSI_QUIET		0x40	/* Be silent if mount errors found */
472 
473 static inline xfs_agnumber_t
xfs_daddr_to_agno(struct xfs_mount * mp,xfs_daddr_t d)474 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
475 {
476 	xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
477 	do_div(ld, mp->m_sb.sb_agblocks);
478 	return (xfs_agnumber_t) ld;
479 }
480 
481 static inline xfs_agblock_t
xfs_daddr_to_agbno(struct xfs_mount * mp,xfs_daddr_t d)482 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
483 {
484 	xfs_rfsblock_t ld = XFS_BB_TO_FSBT(mp, d);
485 	return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
486 }
487 
488 int xfs_buf_hash_init(struct xfs_perag *pag);
489 void xfs_buf_hash_destroy(struct xfs_perag *pag);
490 
491 extern void	xfs_uuid_table_free(void);
492 extern uint64_t xfs_default_resblks(xfs_mount_t *mp);
493 extern int	xfs_mountfs(xfs_mount_t *mp);
494 extern void	xfs_unmountfs(xfs_mount_t *);
495 
496 /*
497  * Deltas for the block count can vary from 1 to very large, but lock contention
498  * only occurs on frequent small block count updates such as in the delayed
499  * allocation path for buffered writes (page a time updates). Hence we set
500  * a large batch count (1024) to minimise global counter updates except when
501  * we get near to ENOSPC and we have to be very accurate with our updates.
502  */
503 #define XFS_FDBLOCKS_BATCH	1024
504 
505 /*
506  * Estimate the amount of free space that is not available to userspace and is
507  * not explicitly reserved from the incore fdblocks.  This includes:
508  *
509  * - The minimum number of blocks needed to support splitting a bmap btree
510  * - The blocks currently in use by the freespace btrees because they record
511  *   the actual blocks that will fill per-AG metadata space reservations
512  */
513 static inline uint64_t
xfs_fdblocks_unavailable(struct xfs_mount * mp)514 xfs_fdblocks_unavailable(
515 	struct xfs_mount	*mp)
516 {
517 	return mp->m_alloc_set_aside + atomic64_read(&mp->m_allocbt_blks);
518 }
519 
520 int xfs_mod_freecounter(struct xfs_mount *mp, struct percpu_counter *counter,
521 		int64_t delta, bool rsvd);
522 
523 static inline int
xfs_mod_fdblocks(struct xfs_mount * mp,int64_t delta,bool reserved)524 xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta, bool reserved)
525 {
526 	return xfs_mod_freecounter(mp, &mp->m_fdblocks, delta, reserved);
527 }
528 
529 static inline int
xfs_mod_frextents(struct xfs_mount * mp,int64_t delta)530 xfs_mod_frextents(struct xfs_mount *mp, int64_t delta)
531 {
532 	return xfs_mod_freecounter(mp, &mp->m_frextents, delta, false);
533 }
534 
535 extern int	xfs_readsb(xfs_mount_t *, int);
536 extern void	xfs_freesb(xfs_mount_t *);
537 extern bool	xfs_fs_writable(struct xfs_mount *mp, int level);
538 extern int	xfs_sb_validate_fsb_count(struct xfs_sb *, uint64_t);
539 
540 extern int	xfs_dev_is_read_only(struct xfs_mount *, char *);
541 
542 extern void	xfs_set_low_space_thresholds(struct xfs_mount *);
543 
544 int	xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
545 			xfs_off_t count_fsb);
546 
547 struct xfs_error_cfg * xfs_error_get_cfg(struct xfs_mount *mp,
548 		int error_class, int error);
549 void xfs_force_summary_recalc(struct xfs_mount *mp);
550 int xfs_add_incompat_log_feature(struct xfs_mount *mp, uint32_t feature);
551 bool xfs_clear_incompat_log_features(struct xfs_mount *mp);
552 void xfs_mod_delalloc(struct xfs_mount *mp, int64_t delta);
553 
554 #endif	/* __XFS_MOUNT_H__ */
555