tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
21typedef struct xfs_trans_reservations {
22 uint tr_write; /* extent alloc trans */
23 uint tr_itruncate; /* truncate trans */
24 uint tr_rename; /* rename trans */
25 uint tr_link; /* link trans */
26 uint tr_remove; /* unlink trans */
27 uint tr_symlink; /* symlink trans */
28 uint tr_create; /* create trans */
29 uint tr_mkdir; /* mkdir trans */
30 uint tr_ifree; /* inode free trans */
31 uint tr_ichange; /* inode update trans */
32 uint tr_growdata; /* fs data section grow trans */
33 uint tr_swrite; /* sync write inode trans */
34 uint tr_addafork; /* cvt inode to attributed trans */
35 uint tr_writeid; /* write setuid/setgid file */
36 uint tr_attrinval; /* attr fork buffer invalidation */
37 uint tr_attrset; /* set/create an attribute */
38 uint tr_attrrm; /* remove an attribute */
39 uint tr_clearagi; /* clear bad agi unlinked ino bucket */
40 uint tr_growrtalloc; /* grow realtime allocations */
41 uint tr_growrtzero; /* grow realtime zeroing */
42 uint tr_growrtfree; /* grow realtime freeing */
43} xfs_trans_reservations_t;
44
45#ifndef __KERNEL__
46
47#define xfs_daddr_to_agno(mp,d) \
48 ((xfs_agnumber_t)(XFS_BB_TO_FSBT(mp, d) / (mp)->m_sb.sb_agblocks))
49#define xfs_daddr_to_agbno(mp,d) \
50 ((xfs_agblock_t)(XFS_BB_TO_FSBT(mp, d) % (mp)->m_sb.sb_agblocks))
51
52#else /* __KERNEL__ */
53
54#include "xfs_sync.h"
55
56struct cred;
57struct log;
58struct xfs_mount_args;
59struct xfs_inode;
60struct xfs_bmbt_irec;
61struct xfs_bmap_free;
62struct xfs_extdelta;
63struct xfs_swapext;
64struct xfs_mru_cache;
65struct xfs_nameops;
66struct xfs_ail;
67struct xfs_quotainfo;
68
69#ifdef HAVE_PERCPU_SB
70
71/*
72 * Valid per-cpu incore superblock counters. Note that if you add new counters,
73 * you may need to define new counter disabled bit field descriptors as there
74 * are more possible fields in the superblock that can fit in a bitfield on a
75 * 32 bit platform. The XFS_SBS_* values for the current current counters just
76 * fit.
77 */
78typedef struct xfs_icsb_cnts {
79 uint64_t icsb_fdblocks;
80 uint64_t icsb_ifree;
81 uint64_t icsb_icount;
82 unsigned long icsb_flags;
83} xfs_icsb_cnts_t;
84
85#define XFS_ICSB_FLAG_LOCK (1 << 0) /* counter lock bit */
86
87#define XFS_ICSB_LAZY_COUNT (1 << 1) /* accuracy not needed */
88
89extern int xfs_icsb_init_counters(struct xfs_mount *);
90extern void xfs_icsb_reinit_counters(struct xfs_mount *);
91extern void xfs_icsb_destroy_counters(struct xfs_mount *);
92extern void xfs_icsb_sync_counters(struct xfs_mount *, int);
93extern void xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
94
95#else
96#define xfs_icsb_init_counters(mp) (0)
97#define xfs_icsb_destroy_counters(mp) do { } while (0)
98#define xfs_icsb_reinit_counters(mp) do { } while (0)
99#define xfs_icsb_sync_counters(mp, flags) do { } while (0)
100#define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
101#endif
102
103typedef struct xfs_mount {
104 struct super_block *m_super;
105 xfs_tid_t m_tid; /* next unused tid for fs */
106 struct xfs_ail *m_ail; /* fs active log item list */
107 xfs_sb_t m_sb; /* copy of fs superblock */
108 spinlock_t m_sb_lock; /* sb counter lock */
109 struct xfs_buf *m_sb_bp; /* buffer for superblock */
110 char *m_fsname; /* filesystem name */
111 int m_fsname_len; /* strlen of fs name */
112 char *m_rtname; /* realtime device name */
113 char *m_logname; /* external log device name */
114 int m_bsize; /* fs logical block size */
115 xfs_agnumber_t m_agfrotor; /* last ag where space found */
116 xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
117 spinlock_t m_agirotor_lock;/* .. and lock protecting it */
118 xfs_agnumber_t m_maxagi; /* highest inode alloc group */
119 uint m_readio_log; /* min read size log bytes */
120 uint m_readio_blocks; /* min read size blocks */
121 uint m_writeio_log; /* min write size log bytes */
122 uint m_writeio_blocks; /* min write size blocks */
123 struct log *m_log; /* log specific stuff */
124 int m_logbufs; /* number of log buffers */
125 int m_logbsize; /* size of each log buffer */
126 uint m_rsumlevels; /* rt summary levels */
127 uint m_rsumsize; /* size of rt summary, bytes */
128 struct xfs_inode *m_rbmip; /* pointer to bitmap inode */
129 struct xfs_inode *m_rsumip; /* pointer to summary inode */
130 struct xfs_inode *m_rootip; /* pointer to root directory */
131 struct xfs_quotainfo *m_quotainfo; /* disk quota information */
132 xfs_buftarg_t *m_ddev_targp; /* saves taking the address */
133 xfs_buftarg_t *m_logdev_targp;/* ptr to log device */
134 xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */
135 __uint8_t m_blkbit_log; /* blocklog + NBBY */
136 __uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
137 __uint8_t m_agno_log; /* log #ag's */
138 __uint8_t m_agino_log; /* #bits for agino in inum */
139 __uint16_t m_inode_cluster_size;/* min inode buf size */
140 uint m_blockmask; /* sb_blocksize-1 */
141 uint m_blockwsize; /* sb_blocksize in words */
142 uint m_blockwmask; /* blockwsize-1 */
143 uint m_alloc_mxr[2]; /* max alloc btree records */
144 uint m_alloc_mnr[2]; /* min alloc btree records */
145 uint m_bmap_dmxr[2]; /* max bmap btree records */
146 uint m_bmap_dmnr[2]; /* min bmap btree records */
147 uint m_inobt_mxr[2]; /* max inobt btree records */
148 uint m_inobt_mnr[2]; /* min inobt btree records */
149 uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
150 uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
151 uint m_in_maxlevels; /* max inobt btree levels. */
152 struct radix_tree_root m_perag_tree; /* per-ag accounting info */
153 spinlock_t m_perag_lock; /* lock for m_perag_tree */
154 struct mutex m_growlock; /* growfs mutex */
155 int m_fixedfsid[2]; /* unchanged for life of FS */
156 uint m_dmevmask; /* DMI events for this FS */
157 __uint64_t m_flags; /* global mount flags */
158 uint m_dir_node_ents; /* #entries in a dir danode */
159 uint m_attr_node_ents; /* #entries in attr danode */
160 int m_ialloc_inos; /* inodes in inode allocation */
161 int m_ialloc_blks; /* blocks in inode allocation */
162 int m_inoalign_mask;/* mask sb_inoalignmt if used */
163 uint m_qflags; /* quota status flags */
164 xfs_trans_reservations_t m_reservations;/* precomputed res values */
165 __uint64_t m_maxicount; /* maximum inode count */
166 __uint64_t m_maxioffset; /* maximum inode offset */
167 __uint64_t m_resblks; /* total reserved blocks */
168 __uint64_t m_resblks_avail;/* available reserved blocks */
169 __uint64_t m_resblks_save; /* reserved blks @ remount,ro */
170 int m_dalign; /* stripe unit */
171 int m_swidth; /* stripe width */
172 int m_sinoalign; /* stripe unit inode alignment */
173 int m_attr_magicpct;/* 37% of the blocksize */
174 int m_dir_magicpct; /* 37% of the dir blocksize */
175 __uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
176 const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
177 int m_dirblksize; /* directory block sz--bytes */
178 int m_dirblkfsbs; /* directory block sz--fsbs */
179 xfs_dablk_t m_dirdatablk; /* blockno of dir data v2 */
180 xfs_dablk_t m_dirleafblk; /* blockno of dir non-data v2 */
181 xfs_dablk_t m_dirfreeblk; /* blockno of dirfreeindex v2 */
182 uint m_chsize; /* size of next field */
183 struct xfs_chash *m_chash; /* fs private inode per-cluster
184 * hash table */
185 atomic_t m_active_trans; /* number trans frozen */
186#ifdef HAVE_PERCPU_SB
187 xfs_icsb_cnts_t __percpu *m_sb_cnts; /* per-cpu superblock counters */
188 unsigned long m_icsb_counters; /* disabled per-cpu counters */
189 struct notifier_block m_icsb_notifier; /* hotplug cpu notifier */
190 struct mutex m_icsb_mutex; /* balancer sync lock */
191#endif
192 struct xfs_mru_cache *m_filestream; /* per-mount filestream data */
193 struct task_struct *m_sync_task; /* generalised sync thread */
194 xfs_sync_work_t m_sync_work; /* work item for VFS_SYNC */
195 struct list_head m_sync_list; /* sync thread work item list */
196 spinlock_t m_sync_lock; /* work item list lock */
197 int m_sync_seq; /* sync thread generation no. */
198 wait_queue_head_t m_wait_single_sync_task;
199 __int64_t m_update_flags; /* sb flags we need to update
200 on the next remount,rw */
201 struct shrinker m_inode_shrink; /* inode reclaim shrinker */
202} xfs_mount_t;
203
204/*
205 * Flags for m_flags.
206 */
207#define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
208 must be synchronous except
209 for space allocations */
210#define XFS_MOUNT_DELAYLOG (1ULL << 1) /* delayed logging is enabled */
211#define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
212#define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
213 operations, typically for
214 disk errors in metadata */
215#define XFS_MOUNT_RETERR (1ULL << 6) /* return alignment errors to
216 user */
217#define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
218 allocations */
219#define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
220#define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
221#define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
222#define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */
223#define XFS_MOUNT_32BITINODES (1ULL << 14) /* do not create inodes above
224 * 32 bits in size */
225#define XFS_MOUNT_SMALL_INUMS (1ULL << 15) /* users wants 32bit inodes */
226#define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
227#define XFS_MOUNT_BARRIER (1ULL << 17)
228#define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
229#define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
230 * allocation */
231#define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
232#define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
233#define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
234 * I/O size in stat() */
235#define XFS_MOUNT_NO_PERCPU_SB (1ULL << 23) /* don't use per-cpu superblock
236 counters */
237#define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
238 allocator */
239#define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
240
241
242/*
243 * Default minimum read and write sizes.
244 */
245#define XFS_READIO_LOG_LARGE 16
246#define XFS_WRITEIO_LOG_LARGE 16
247
248/*
249 * Max and min values for mount-option defined I/O
250 * preallocation sizes.
251 */
252#define XFS_MAX_IO_LOG 30 /* 1G */
253#define XFS_MIN_IO_LOG PAGE_SHIFT
254
255/*
256 * Synchronous read and write sizes. This should be
257 * better for NFSv2 wsync filesystems.
258 */
259#define XFS_WSYNC_READIO_LOG 15 /* 32k */
260#define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */
261
262/*
263 * Allow large block sizes to be reported to userspace programs if the
264 * "largeio" mount option is used.
265 *
266 * If compatibility mode is specified, simply return the basic unit of caching
267 * so that we don't get inefficient read/modify/write I/O from user apps.
268 * Otherwise....
269 *
270 * If the underlying volume is a stripe, then return the stripe width in bytes
271 * as the recommended I/O size. It is not a stripe and we've set a default
272 * buffered I/O size, return that, otherwise return the compat default.
273 */
274static inline unsigned long
275xfs_preferred_iosize(xfs_mount_t *mp)
276{
277 if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
278 return PAGE_CACHE_SIZE;
279 return (mp->m_swidth ?
280 (mp->m_swidth << mp->m_sb.sb_blocklog) :
281 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
282 (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
283 PAGE_CACHE_SIZE));
284}
285
286#define XFS_MAXIOFFSET(mp) ((mp)->m_maxioffset)
287
288#define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
289 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
290#define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
291void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
292 int lnnum);
293#define xfs_force_shutdown(m,f) \
294 xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
295
296#define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
297#define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
298#define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
299#define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
300#define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */
301#define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */
302
303#define xfs_test_for_freeze(mp) ((mp)->m_super->s_frozen)
304#define xfs_wait_for_freeze(mp,l) vfs_check_frozen((mp)->m_super, (l))
305
306/*
307 * Flags for xfs_mountfs
308 */
309#define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
310
311static inline xfs_agnumber_t
312xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
313{
314 xfs_daddr_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
319static inline xfs_agblock_t
320xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
321{
322 xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
323 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
324}
325
326/*
327 * perag get/put wrappers for ref counting
328 */
329struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
330void xfs_perag_put(struct xfs_perag *pag);
331
332/*
333 * Per-cpu superblock locking functions
334 */
335#ifdef HAVE_PERCPU_SB
336static inline void
337xfs_icsb_lock(xfs_mount_t *mp)
338{
339 mutex_lock(&mp->m_icsb_mutex);
340}
341
342static inline void
343xfs_icsb_unlock(xfs_mount_t *mp)
344{
345 mutex_unlock(&mp->m_icsb_mutex);
346}
347#else
348#define xfs_icsb_lock(mp)
349#define xfs_icsb_unlock(mp)
350#endif
351
352/*
353 * This structure is for use by the xfs_mod_incore_sb_batch() routine.
354 * xfs_growfs can specify a few fields which are more than int limit
355 */
356typedef struct xfs_mod_sb {
357 xfs_sb_field_t msb_field; /* Field to modify, see below */
358 int64_t msb_delta; /* Change to make to specified field */
359} xfs_mod_sb_t;
360
361extern int xfs_log_sbcount(xfs_mount_t *, uint);
362extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
363extern int xfs_mountfs(xfs_mount_t *mp);
364
365extern void xfs_unmountfs(xfs_mount_t *);
366extern int xfs_unmountfs_writesb(xfs_mount_t *);
367extern int xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
368extern int xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
369 uint, int);
370extern int xfs_mount_log_sb(xfs_mount_t *, __int64_t);
371extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
372extern int xfs_readsb(xfs_mount_t *, int);
373extern void xfs_freesb(xfs_mount_t *);
374extern int xfs_fs_writable(xfs_mount_t *);
375extern int xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
376
377extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
378
379#endif /* __KERNEL__ */
380
381extern void xfs_mod_sb(struct xfs_trans *, __int64_t);
382extern int xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
383 xfs_agnumber_t *);
384extern void xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
385extern void xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
386
387#endif /* __XFS_MOUNT_H__ */