xfs: debug mode forced buffered write failure
[deliverable/linux.git] / fs / xfs / xfs_mount.h
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 typedef struct xfs_mount {
41 struct super_block *m_super;
42 xfs_tid_t m_tid; /* next unused tid for fs */
43 struct xfs_ail *m_ail; /* fs active log item list */
44
45 struct xfs_sb m_sb; /* copy of fs superblock */
46 spinlock_t m_sb_lock; /* sb counter lock */
47 struct percpu_counter m_icount; /* allocated inodes counter */
48 struct percpu_counter m_ifree; /* free inodes counter */
49 struct percpu_counter m_fdblocks; /* free block counter */
50
51 struct xfs_buf *m_sb_bp; /* buffer for superblock */
52 char *m_fsname; /* filesystem name */
53 int m_fsname_len; /* strlen of fs name */
54 char *m_rtname; /* realtime device name */
55 char *m_logname; /* external log device name */
56 int m_bsize; /* fs logical block size */
57 xfs_agnumber_t m_agfrotor; /* last ag where space found */
58 xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
59 spinlock_t m_agirotor_lock;/* .. and lock protecting it */
60 xfs_agnumber_t m_maxagi; /* highest inode alloc group */
61 uint m_readio_log; /* min read size log bytes */
62 uint m_readio_blocks; /* min read size blocks */
63 uint m_writeio_log; /* min write size log bytes */
64 uint m_writeio_blocks; /* min write size blocks */
65 struct xfs_da_geometry *m_dir_geo; /* directory block geometry */
66 struct xfs_da_geometry *m_attr_geo; /* attribute block geometry */
67 struct xlog *m_log; /* log specific stuff */
68 int m_logbufs; /* number of log buffers */
69 int m_logbsize; /* size of each log buffer */
70 uint m_rsumlevels; /* rt summary levels */
71 uint m_rsumsize; /* size of rt summary, bytes */
72 struct xfs_inode *m_rbmip; /* pointer to bitmap inode */
73 struct xfs_inode *m_rsumip; /* pointer to summary inode */
74 struct xfs_inode *m_rootip; /* pointer to root directory */
75 struct xfs_quotainfo *m_quotainfo; /* disk quota information */
76 xfs_buftarg_t *m_ddev_targp; /* saves taking the address */
77 xfs_buftarg_t *m_logdev_targp;/* ptr to log device */
78 xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */
79 __uint8_t m_blkbit_log; /* blocklog + NBBY */
80 __uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
81 __uint8_t m_agno_log; /* log #ag's */
82 __uint8_t m_agino_log; /* #bits for agino in inum */
83 uint m_inode_cluster_size;/* min inode buf size */
84 uint m_blockmask; /* sb_blocksize-1 */
85 uint m_blockwsize; /* sb_blocksize in words */
86 uint m_blockwmask; /* blockwsize-1 */
87 uint m_alloc_mxr[2]; /* max alloc btree records */
88 uint m_alloc_mnr[2]; /* min alloc btree records */
89 uint m_bmap_dmxr[2]; /* max bmap btree records */
90 uint m_bmap_dmnr[2]; /* min bmap btree records */
91 uint m_inobt_mxr[2]; /* max inobt btree records */
92 uint m_inobt_mnr[2]; /* min inobt btree records */
93 uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
94 uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
95 uint m_in_maxlevels; /* max inobt btree levels. */
96 struct radix_tree_root m_perag_tree; /* per-ag accounting info */
97 spinlock_t m_perag_lock; /* lock for m_perag_tree */
98 struct mutex m_growlock; /* growfs mutex */
99 int m_fixedfsid[2]; /* unchanged for life of FS */
100 uint m_dmevmask; /* DMI events for this FS */
101 __uint64_t m_flags; /* global mount flags */
102 int m_ialloc_inos; /* inodes in inode allocation */
103 int m_ialloc_blks; /* blocks in inode allocation */
104 int m_ialloc_min_blks;/* min blocks in sparse inode
105 * allocation */
106 int m_inoalign_mask;/* mask sb_inoalignmt if used */
107 uint m_qflags; /* quota status flags */
108 struct xfs_trans_resv m_resv; /* precomputed res values */
109 __uint64_t m_maxicount; /* maximum inode count */
110 __uint64_t m_resblks; /* total reserved blocks */
111 __uint64_t m_resblks_avail;/* available reserved blocks */
112 __uint64_t m_resblks_save; /* reserved blks @ remount,ro */
113 int m_dalign; /* stripe unit */
114 int m_swidth; /* stripe width */
115 int m_sinoalign; /* stripe unit inode alignment */
116 __uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
117 const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
118 const struct xfs_dir_ops *m_dir_inode_ops; /* vector of dir inode ops */
119 const struct xfs_dir_ops *m_nondir_inode_ops; /* !dir inode ops */
120 uint m_chsize; /* size of next field */
121 atomic_t m_active_trans; /* number trans frozen */
122 struct xfs_mru_cache *m_filestream; /* per-mount filestream data */
123 struct delayed_work m_reclaim_work; /* background inode reclaim */
124 struct delayed_work m_eofblocks_work; /* background eof blocks
125 trimming */
126 bool m_update_sb; /* sb needs update in mount */
127 int64_t m_low_space[XFS_LOWSP_MAX];
128 /* low free space thresholds */
129 struct xfs_kobj m_kobj;
130 struct xstats m_stats; /* per-fs stats */
131
132 struct workqueue_struct *m_buf_workqueue;
133 struct workqueue_struct *m_data_workqueue;
134 struct workqueue_struct *m_unwritten_workqueue;
135 struct workqueue_struct *m_cil_workqueue;
136 struct workqueue_struct *m_reclaim_workqueue;
137 struct workqueue_struct *m_log_workqueue;
138 struct workqueue_struct *m_eofblocks_workqueue;
139
140 /*
141 * Generation of the filesysyem layout. This is incremented by each
142 * growfs, and used by the pNFS server to ensure the client updates
143 * its view of the block device once it gets a layout that might
144 * reference the newly added blocks. Does not need to be persistent
145 * as long as we only allow file system size increments, but if we
146 * ever support shrinks it would have to be persisted in addition
147 * to various other kinds of pain inflicted on the pNFS server.
148 */
149 __uint32_t m_generation;
150
151 #ifdef DEBUG
152 /*
153 * DEBUG mode instrumentation to test and/or trigger delayed allocation
154 * block killing in the event of failed writes. When enabled, all
155 * buffered writes are forced to fail. All delalloc blocks in the range
156 * of the write (including pre-existing delalloc blocks!) are tossed as
157 * part of the write failure error handling sequence.
158 */
159 bool m_fail_writes;
160 #endif
161 } xfs_mount_t;
162
163 /*
164 * Flags for m_flags.
165 */
166 #define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
167 must be synchronous except
168 for space allocations */
169 #define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
170 #define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
171 operations, typically for
172 disk errors in metadata */
173 #define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */
174 #define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
175 allocations */
176 #define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
177 #define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
178 #define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
179 #define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */
180 #define XFS_MOUNT_32BITINODES (1ULL << 14) /* do not create inodes above
181 * 32 bits in size */
182 #define XFS_MOUNT_SMALL_INUMS (1ULL << 15) /* users wants 32bit inodes */
183 #define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
184 #define XFS_MOUNT_BARRIER (1ULL << 17)
185 #define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
186 #define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
187 * allocation */
188 #define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
189 #define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
190 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
191 * I/O size in stat() */
192 #define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
193 allocator */
194 #define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
195
196 #define XFS_MOUNT_DAX (1ULL << 62) /* TEST ONLY! */
197
198
199 /*
200 * Default minimum read and write sizes.
201 */
202 #define XFS_READIO_LOG_LARGE 16
203 #define XFS_WRITEIO_LOG_LARGE 16
204
205 /*
206 * Max and min values for mount-option defined I/O
207 * preallocation sizes.
208 */
209 #define XFS_MAX_IO_LOG 30 /* 1G */
210 #define XFS_MIN_IO_LOG PAGE_SHIFT
211
212 /*
213 * Synchronous read and write sizes. This should be
214 * better for NFSv2 wsync filesystems.
215 */
216 #define XFS_WSYNC_READIO_LOG 15 /* 32k */
217 #define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */
218
219 /*
220 * Allow large block sizes to be reported to userspace programs if the
221 * "largeio" mount option is used.
222 *
223 * If compatibility mode is specified, simply return the basic unit of caching
224 * so that we don't get inefficient read/modify/write I/O from user apps.
225 * Otherwise....
226 *
227 * If the underlying volume is a stripe, then return the stripe width in bytes
228 * as the recommended I/O size. It is not a stripe and we've set a default
229 * buffered I/O size, return that, otherwise return the compat default.
230 */
231 static inline unsigned long
232 xfs_preferred_iosize(xfs_mount_t *mp)
233 {
234 if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
235 return PAGE_CACHE_SIZE;
236 return (mp->m_swidth ?
237 (mp->m_swidth << mp->m_sb.sb_blocklog) :
238 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
239 (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
240 PAGE_CACHE_SIZE));
241 }
242
243 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
244 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
245 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
246 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
247 int lnnum);
248 #define xfs_force_shutdown(m,f) \
249 xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
250
251 #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
252 #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
253 #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
254 #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
255 #define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */
256 #define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */
257
258 /*
259 * Flags for xfs_mountfs
260 */
261 #define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
262
263 static inline xfs_agnumber_t
264 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
265 {
266 xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
267 do_div(ld, mp->m_sb.sb_agblocks);
268 return (xfs_agnumber_t) ld;
269 }
270
271 static inline xfs_agblock_t
272 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
273 {
274 xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
275 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
276 }
277
278 #ifdef DEBUG
279 static inline bool
280 xfs_mp_fail_writes(struct xfs_mount *mp)
281 {
282 return mp->m_fail_writes;
283 }
284 #else
285 static inline bool
286 xfs_mp_fail_writes(struct xfs_mount *mp)
287 {
288 return 0;
289 }
290 #endif
291
292 /*
293 * Per-ag incore structure, copies of information in agf and agi, to improve the
294 * performance of allocation group selection.
295 */
296 typedef struct xfs_perag {
297 struct xfs_mount *pag_mount; /* owner filesystem */
298 xfs_agnumber_t pag_agno; /* AG this structure belongs to */
299 atomic_t pag_ref; /* perag reference count */
300 char pagf_init; /* this agf's entry is initialized */
301 char pagi_init; /* this agi's entry is initialized */
302 char pagf_metadata; /* the agf is preferred to be metadata */
303 char pagi_inodeok; /* The agi is ok for inodes */
304 __uint8_t pagf_levels[XFS_BTNUM_AGF];
305 /* # of levels in bno & cnt btree */
306 __uint32_t pagf_flcount; /* count of blocks in freelist */
307 xfs_extlen_t pagf_freeblks; /* total free blocks */
308 xfs_extlen_t pagf_longest; /* longest free space */
309 __uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
310 xfs_agino_t pagi_freecount; /* number of free inodes */
311 xfs_agino_t pagi_count; /* number of allocated inodes */
312
313 /*
314 * Inode allocation search lookup optimisation.
315 * If the pagino matches, the search for new inodes
316 * doesn't need to search the near ones again straight away
317 */
318 xfs_agino_t pagl_pagino;
319 xfs_agino_t pagl_leftrec;
320 xfs_agino_t pagl_rightrec;
321 spinlock_t pagb_lock; /* lock for pagb_tree */
322 struct rb_root pagb_tree; /* ordered tree of busy extents */
323
324 atomic_t pagf_fstrms; /* # of filestreams active in this AG */
325
326 spinlock_t pag_ici_lock; /* incore inode cache lock */
327 struct radix_tree_root pag_ici_root; /* incore inode cache root */
328 int pag_ici_reclaimable; /* reclaimable inodes */
329 struct mutex pag_ici_reclaim_lock; /* serialisation point */
330 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
331
332 /* buffer cache index */
333 spinlock_t pag_buf_lock; /* lock for pag_buf_tree */
334 struct rb_root pag_buf_tree; /* ordered tree of active buffers */
335
336 /* for rcu-safe freeing */
337 struct rcu_head rcu_head;
338 int pagb_count; /* pagb slots in use */
339 } xfs_perag_t;
340
341 extern void xfs_uuid_table_free(void);
342 extern int xfs_log_sbcount(xfs_mount_t *);
343 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
344 extern int xfs_mountfs(xfs_mount_t *mp);
345 extern int xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
346 xfs_agnumber_t *maxagi);
347 extern void xfs_unmountfs(xfs_mount_t *);
348
349 extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
350 extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
351 extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
352 bool reserved);
353 extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
354
355 extern int xfs_mount_log_sb(xfs_mount_t *);
356 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
357 extern int xfs_readsb(xfs_mount_t *, int);
358 extern void xfs_freesb(xfs_mount_t *);
359 extern bool xfs_fs_writable(struct xfs_mount *mp, int level);
360 extern int xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
361
362 extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
363
364 extern void xfs_set_low_space_thresholds(struct xfs_mount *);
365
366 int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
367 xfs_off_t count_fsb);
368
369 #endif /* __XFS_MOUNT_H__ */
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