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 #ifdef __KERNEL__
22
23 struct xlog;
24 struct xfs_inode;
25 struct xfs_mru_cache;
26 struct xfs_nameops;
27 struct xfs_ail;
28 struct xfs_quotainfo;
29 struct xfs_dir_ops;
30 struct xfs_da_geometry;
31
32 #ifdef HAVE_PERCPU_SB
33
34 /*
35 * Valid per-cpu incore superblock counters. Note that if you add new counters,
36 * you may need to define new counter disabled bit field descriptors as there
37 * are more possible fields in the superblock that can fit in a bitfield on a
38 * 32 bit platform. The XFS_SBS_* values for the current current counters just
39 * fit.
40 */
41 typedef struct xfs_icsb_cnts {
42 uint64_t icsb_fdblocks;
43 uint64_t icsb_ifree;
44 uint64_t icsb_icount;
45 unsigned long icsb_flags;
46 } xfs_icsb_cnts_t;
47
48 #define XFS_ICSB_FLAG_LOCK (1 << 0) /* counter lock bit */
49
50 #define XFS_ICSB_LAZY_COUNT (1 << 1) /* accuracy not needed */
51
52 extern int xfs_icsb_init_counters(struct xfs_mount *);
53 extern void xfs_icsb_reinit_counters(struct xfs_mount *);
54 extern void xfs_icsb_destroy_counters(struct xfs_mount *);
55 extern void xfs_icsb_sync_counters(struct xfs_mount *, int);
56 extern void xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
57 extern int xfs_icsb_modify_counters(struct xfs_mount *, xfs_sb_field_t,
58 int64_t, int);
59
60 #else
61 #define xfs_icsb_init_counters(mp) (0)
62 #define xfs_icsb_destroy_counters(mp) do { } while (0)
63 #define xfs_icsb_reinit_counters(mp) do { } while (0)
64 #define xfs_icsb_sync_counters(mp, flags) do { } while (0)
65 #define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
66 #define xfs_icsb_modify_counters(mp, field, delta, rsvd) \
67 xfs_mod_incore_sb(mp, field, delta, rsvd)
68 #endif
69
70 /* dynamic preallocation free space thresholds, 5% down to 1% */
71 enum {
72 XFS_LOWSP_1_PCNT = 0,
73 XFS_LOWSP_2_PCNT,
74 XFS_LOWSP_3_PCNT,
75 XFS_LOWSP_4_PCNT,
76 XFS_LOWSP_5_PCNT,
77 XFS_LOWSP_MAX,
78 };
79
80 typedef struct xfs_mount {
81 struct super_block *m_super;
82 xfs_tid_t m_tid; /* next unused tid for fs */
83 struct xfs_ail *m_ail; /* fs active log item list */
84 xfs_sb_t m_sb; /* copy of fs superblock */
85 spinlock_t m_sb_lock; /* sb counter lock */
86 struct xfs_buf *m_sb_bp; /* buffer for superblock */
87 char *m_fsname; /* filesystem name */
88 int m_fsname_len; /* strlen of fs name */
89 char *m_rtname; /* realtime device name */
90 char *m_logname; /* external log device name */
91 int m_bsize; /* fs logical block size */
92 xfs_agnumber_t m_agfrotor; /* last ag where space found */
93 xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
94 spinlock_t m_agirotor_lock;/* .. and lock protecting it */
95 xfs_agnumber_t m_maxagi; /* highest inode alloc group */
96 uint m_readio_log; /* min read size log bytes */
97 uint m_readio_blocks; /* min read size blocks */
98 uint m_writeio_log; /* min write size log bytes */
99 uint m_writeio_blocks; /* min write size blocks */
100 struct xfs_da_geometry *m_dir_geo; /* directory block geometry */
101 struct xfs_da_geometry *m_attr_geo; /* attribute block geometry */
102 struct xlog *m_log; /* log specific stuff */
103 int m_logbufs; /* number of log buffers */
104 int m_logbsize; /* size of each log buffer */
105 uint m_rsumlevels; /* rt summary levels */
106 uint m_rsumsize; /* size of rt summary, bytes */
107 struct xfs_inode *m_rbmip; /* pointer to bitmap inode */
108 struct xfs_inode *m_rsumip; /* pointer to summary inode */
109 struct xfs_inode *m_rootip; /* pointer to root directory */
110 struct xfs_quotainfo *m_quotainfo; /* disk quota information */
111 xfs_buftarg_t *m_ddev_targp; /* saves taking the address */
112 xfs_buftarg_t *m_logdev_targp;/* ptr to log device */
113 xfs_buftarg_t *m_rtdev_targp; /* ptr to rt device */
114 __uint8_t m_blkbit_log; /* blocklog + NBBY */
115 __uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
116 __uint8_t m_agno_log; /* log #ag's */
117 __uint8_t m_agino_log; /* #bits for agino in inum */
118 uint m_inode_cluster_size;/* min inode buf size */
119 uint m_blockmask; /* sb_blocksize-1 */
120 uint m_blockwsize; /* sb_blocksize in words */
121 uint m_blockwmask; /* blockwsize-1 */
122 uint m_alloc_mxr[2]; /* max alloc btree records */
123 uint m_alloc_mnr[2]; /* min alloc btree records */
124 uint m_bmap_dmxr[2]; /* max bmap btree records */
125 uint m_bmap_dmnr[2]; /* min bmap btree records */
126 uint m_inobt_mxr[2]; /* max inobt btree records */
127 uint m_inobt_mnr[2]; /* min inobt btree records */
128 uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
129 uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
130 uint m_in_maxlevels; /* max inobt btree levels. */
131 struct radix_tree_root m_perag_tree; /* per-ag accounting info */
132 spinlock_t m_perag_lock; /* lock for m_perag_tree */
133 struct mutex m_growlock; /* growfs mutex */
134 int m_fixedfsid[2]; /* unchanged for life of FS */
135 uint m_dmevmask; /* DMI events for this FS */
136 __uint64_t m_flags; /* global mount flags */
137 int m_ialloc_inos; /* inodes in inode allocation */
138 int m_ialloc_blks; /* blocks in inode allocation */
139 int m_inoalign_mask;/* mask sb_inoalignmt if used */
140 uint m_qflags; /* quota status flags */
141 struct xfs_trans_resv m_resv; /* precomputed res values */
142 __uint64_t m_maxicount; /* maximum inode count */
143 __uint64_t m_resblks; /* total reserved blocks */
144 __uint64_t m_resblks_avail;/* available reserved blocks */
145 __uint64_t m_resblks_save; /* reserved blks @ remount,ro */
146 int m_dalign; /* stripe unit */
147 int m_swidth; /* stripe width */
148 int m_sinoalign; /* stripe unit inode alignment */
149 __uint8_t m_sectbb_log; /* sectlog - BBSHIFT */
150 const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
151 const struct xfs_dir_ops *m_dir_inode_ops; /* vector of dir inode ops */
152 const struct xfs_dir_ops *m_nondir_inode_ops; /* !dir inode ops */
153 uint m_chsize; /* size of next field */
154 atomic_t m_active_trans; /* number trans frozen */
155 #ifdef HAVE_PERCPU_SB
156 xfs_icsb_cnts_t __percpu *m_sb_cnts; /* per-cpu superblock counters */
157 unsigned long m_icsb_counters; /* disabled per-cpu counters */
158 struct notifier_block m_icsb_notifier; /* hotplug cpu notifier */
159 struct mutex m_icsb_mutex; /* balancer sync lock */
160 #endif
161 struct xfs_mru_cache *m_filestream; /* per-mount filestream data */
162 struct delayed_work m_reclaim_work; /* background inode reclaim */
163 struct delayed_work m_eofblocks_work; /* background eof blocks
164 trimming */
165 __int64_t m_update_flags; /* sb flags we need to update
166 on the next remount,rw */
167 int64_t m_low_space[XFS_LOWSP_MAX];
168 /* low free space thresholds */
169 struct xfs_kobj m_kobj;
170
171 struct workqueue_struct *m_data_workqueue;
172 struct workqueue_struct *m_unwritten_workqueue;
173 struct workqueue_struct *m_cil_workqueue;
174 struct workqueue_struct *m_reclaim_workqueue;
175 struct workqueue_struct *m_log_workqueue;
176 struct workqueue_struct *m_eofblocks_workqueue;
177 } xfs_mount_t;
178
179 /*
180 * Flags for m_flags.
181 */
182 #define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
183 must be synchronous except
184 for space allocations */
185 #define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
186 #define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
187 operations, typically for
188 disk errors in metadata */
189 #define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */
190 #define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
191 allocations */
192 #define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
193 #define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
194 #define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
195 #define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */
196 #define XFS_MOUNT_32BITINODES (1ULL << 14) /* do not create inodes above
197 * 32 bits in size */
198 #define XFS_MOUNT_SMALL_INUMS (1ULL << 15) /* users wants 32bit inodes */
199 #define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
200 #define XFS_MOUNT_BARRIER (1ULL << 17)
201 #define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
202 #define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
203 * allocation */
204 #define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
205 #define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
206 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
207 * I/O size in stat() */
208 #define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
209 allocator */
210 #define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
211
212
213 /*
214 * Default minimum read and write sizes.
215 */
216 #define XFS_READIO_LOG_LARGE 16
217 #define XFS_WRITEIO_LOG_LARGE 16
218
219 /*
220 * Max and min values for mount-option defined I/O
221 * preallocation sizes.
222 */
223 #define XFS_MAX_IO_LOG 30 /* 1G */
224 #define XFS_MIN_IO_LOG PAGE_SHIFT
225
226 /*
227 * Synchronous read and write sizes. This should be
228 * better for NFSv2 wsync filesystems.
229 */
230 #define XFS_WSYNC_READIO_LOG 15 /* 32k */
231 #define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */
232
233 /*
234 * Allow large block sizes to be reported to userspace programs if the
235 * "largeio" mount option is used.
236 *
237 * If compatibility mode is specified, simply return the basic unit of caching
238 * so that we don't get inefficient read/modify/write I/O from user apps.
239 * Otherwise....
240 *
241 * If the underlying volume is a stripe, then return the stripe width in bytes
242 * as the recommended I/O size. It is not a stripe and we've set a default
243 * buffered I/O size, return that, otherwise return the compat default.
244 */
245 static inline unsigned long
xfs_preferred_iosize(xfs_mount_t * mp)246 xfs_preferred_iosize(xfs_mount_t *mp)
247 {
248 if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
249 return PAGE_CACHE_SIZE;
250 return (mp->m_swidth ?
251 (mp->m_swidth << mp->m_sb.sb_blocklog) :
252 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
253 (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
254 PAGE_CACHE_SIZE));
255 }
256
257 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
258 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
259 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
260 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
261 int lnnum);
262 #define xfs_force_shutdown(m,f) \
263 xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
264
265 #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
266 #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
267 #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
268 #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
269 #define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */
270 #define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */
271
272 /*
273 * Flags for xfs_mountfs
274 */
275 #define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
276
277 static inline xfs_agnumber_t
xfs_daddr_to_agno(struct xfs_mount * mp,xfs_daddr_t d)278 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
279 {
280 xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
281 do_div(ld, mp->m_sb.sb_agblocks);
282 return (xfs_agnumber_t) ld;
283 }
284
285 static inline xfs_agblock_t
xfs_daddr_to_agbno(struct xfs_mount * mp,xfs_daddr_t d)286 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
287 {
288 xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
289 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
290 }
291
292 /*
293 * Per-cpu superblock locking functions
294 */
295 #ifdef HAVE_PERCPU_SB
296 static inline void
xfs_icsb_lock(xfs_mount_t * mp)297 xfs_icsb_lock(xfs_mount_t *mp)
298 {
299 mutex_lock(&mp->m_icsb_mutex);
300 }
301
302 static inline void
xfs_icsb_unlock(xfs_mount_t * mp)303 xfs_icsb_unlock(xfs_mount_t *mp)
304 {
305 mutex_unlock(&mp->m_icsb_mutex);
306 }
307 #else
308 #define xfs_icsb_lock(mp)
309 #define xfs_icsb_unlock(mp)
310 #endif
311
312 /*
313 * This structure is for use by the xfs_mod_incore_sb_batch() routine.
314 * xfs_growfs can specify a few fields which are more than int limit
315 */
316 typedef struct xfs_mod_sb {
317 xfs_sb_field_t msb_field; /* Field to modify, see below */
318 int64_t msb_delta; /* Change to make to specified field */
319 } xfs_mod_sb_t;
320
321 /*
322 * Per-ag incore structure, copies of information in agf and agi, to improve the
323 * performance of allocation group selection. This is defined for the kernel
324 * only, and hence is defined here instead of in xfs_ag.h. You need the struct
325 * xfs_mount to be defined to look up a xfs_perag anyway (via mp->m_perag_tree),
326 * so this doesn't introduce any strange header file dependencies.
327 */
328 typedef struct xfs_perag {
329 struct xfs_mount *pag_mount; /* owner filesystem */
330 xfs_agnumber_t pag_agno; /* AG this structure belongs to */
331 atomic_t pag_ref; /* perag reference count */
332 char pagf_init; /* this agf's entry is initialized */
333 char pagi_init; /* this agi's entry is initialized */
334 char pagf_metadata; /* the agf is preferred to be metadata */
335 char pagi_inodeok; /* The agi is ok for inodes */
336 __uint8_t pagf_levels[XFS_BTNUM_AGF];
337 /* # of levels in bno & cnt btree */
338 __uint32_t pagf_flcount; /* count of blocks in freelist */
339 xfs_extlen_t pagf_freeblks; /* total free blocks */
340 xfs_extlen_t pagf_longest; /* longest free space */
341 __uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
342 xfs_agino_t pagi_freecount; /* number of free inodes */
343 xfs_agino_t pagi_count; /* number of allocated inodes */
344
345 /*
346 * Inode allocation search lookup optimisation.
347 * If the pagino matches, the search for new inodes
348 * doesn't need to search the near ones again straight away
349 */
350 xfs_agino_t pagl_pagino;
351 xfs_agino_t pagl_leftrec;
352 xfs_agino_t pagl_rightrec;
353 spinlock_t pagb_lock; /* lock for pagb_tree */
354 struct rb_root pagb_tree; /* ordered tree of busy extents */
355
356 atomic_t pagf_fstrms; /* # of filestreams active in this AG */
357
358 spinlock_t pag_ici_lock; /* incore inode cache lock */
359 struct radix_tree_root pag_ici_root; /* incore inode cache root */
360 int pag_ici_reclaimable; /* reclaimable inodes */
361 struct mutex pag_ici_reclaim_lock; /* serialisation point */
362 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
363
364 /* buffer cache index */
365 spinlock_t pag_buf_lock; /* lock for pag_buf_tree */
366 struct rb_root pag_buf_tree; /* ordered tree of active buffers */
367
368 /* for rcu-safe freeing */
369 struct rcu_head rcu_head;
370 int pagb_count; /* pagb slots in use */
371 } xfs_perag_t;
372
373 extern int xfs_log_sbcount(xfs_mount_t *);
374 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
375 extern int xfs_mountfs(xfs_mount_t *mp);
376 extern int xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
377 xfs_agnumber_t *maxagi);
378
379 extern void xfs_unmountfs(xfs_mount_t *);
380 extern int xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
381 extern int xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
382 uint, int);
383 extern int xfs_mount_log_sb(xfs_mount_t *, __int64_t);
384 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
385 extern int xfs_readsb(xfs_mount_t *, int);
386 extern void xfs_freesb(xfs_mount_t *);
387 extern int xfs_fs_writable(xfs_mount_t *);
388 extern int xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
389
390 extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
391
392 extern void xfs_set_low_space_thresholds(struct xfs_mount *);
393
394 #endif /* __KERNEL__ */
395
396 #endif /* __XFS_MOUNT_H__ */
397