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 } xfs_mount_t;
151
152 /*
153 * Flags for m_flags.
154 */
155 #define XFS_MOUNT_WSYNC (1ULL << 0) /* for nfs - all metadata ops
156 must be synchronous except
157 for space allocations */
158 #define XFS_MOUNT_WAS_CLEAN (1ULL << 3)
159 #define XFS_MOUNT_FS_SHUTDOWN (1ULL << 4) /* atomic stop of all filesystem
160 operations, typically for
161 disk errors in metadata */
162 #define XFS_MOUNT_DISCARD (1ULL << 5) /* discard unused blocks */
163 #define XFS_MOUNT_NOALIGN (1ULL << 7) /* turn off stripe alignment
164 allocations */
165 #define XFS_MOUNT_ATTR2 (1ULL << 8) /* allow use of attr2 format */
166 #define XFS_MOUNT_GRPID (1ULL << 9) /* group-ID assigned from directory */
167 #define XFS_MOUNT_NORECOVERY (1ULL << 10) /* no recovery - dirty fs */
168 #define XFS_MOUNT_DFLT_IOSIZE (1ULL << 12) /* set default i/o size */
169 #define XFS_MOUNT_32BITINODES (1ULL << 14) /* do not create inodes above
170 * 32 bits in size */
171 #define XFS_MOUNT_SMALL_INUMS (1ULL << 15) /* users wants 32bit inodes */
172 #define XFS_MOUNT_NOUUID (1ULL << 16) /* ignore uuid during mount */
173 #define XFS_MOUNT_BARRIER (1ULL << 17)
174 #define XFS_MOUNT_IKEEP (1ULL << 18) /* keep empty inode clusters*/
175 #define XFS_MOUNT_SWALLOC (1ULL << 19) /* turn on stripe width
176 * allocation */
177 #define XFS_MOUNT_RDONLY (1ULL << 20) /* read-only fs */
178 #define XFS_MOUNT_DIRSYNC (1ULL << 21) /* synchronous directory ops */
179 #define XFS_MOUNT_COMPAT_IOSIZE (1ULL << 22) /* don't report large preferred
180 * I/O size in stat() */
181 #define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams
182 allocator */
183 #define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */
184
185 #define XFS_MOUNT_DAX (1ULL << 62) /* TEST ONLY! */
186
187
188 /*
189 * Default minimum read and write sizes.
190 */
191 #define XFS_READIO_LOG_LARGE 16
192 #define XFS_WRITEIO_LOG_LARGE 16
193
194 /*
195 * Max and min values for mount-option defined I/O
196 * preallocation sizes.
197 */
198 #define XFS_MAX_IO_LOG 30 /* 1G */
199 #define XFS_MIN_IO_LOG PAGE_SHIFT
200
201 /*
202 * Synchronous read and write sizes. This should be
203 * better for NFSv2 wsync filesystems.
204 */
205 #define XFS_WSYNC_READIO_LOG 15 /* 32k */
206 #define XFS_WSYNC_WRITEIO_LOG 14 /* 16k */
207
208 /*
209 * Allow large block sizes to be reported to userspace programs if the
210 * "largeio" mount option is used.
211 *
212 * If compatibility mode is specified, simply return the basic unit of caching
213 * so that we don't get inefficient read/modify/write I/O from user apps.
214 * Otherwise....
215 *
216 * If the underlying volume is a stripe, then return the stripe width in bytes
217 * as the recommended I/O size. It is not a stripe and we've set a default
218 * buffered I/O size, return that, otherwise return the compat default.
219 */
220 static inline unsigned long
xfs_preferred_iosize(xfs_mount_t * mp)221 xfs_preferred_iosize(xfs_mount_t *mp)
222 {
223 if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
224 return PAGE_CACHE_SIZE;
225 return (mp->m_swidth ?
226 (mp->m_swidth << mp->m_sb.sb_blocklog) :
227 ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
228 (1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
229 PAGE_CACHE_SIZE));
230 }
231
232 #define XFS_LAST_UNMOUNT_WAS_CLEAN(mp) \
233 ((mp)->m_flags & XFS_MOUNT_WAS_CLEAN)
234 #define XFS_FORCED_SHUTDOWN(mp) ((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
235 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
236 int lnnum);
237 #define xfs_force_shutdown(m,f) \
238 xfs_do_force_shutdown(m, f, __FILE__, __LINE__)
239
240 #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */
241 #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
242 #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
243 #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
244 #define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */
245 #define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */
246
247 /*
248 * Flags for xfs_mountfs
249 */
250 #define XFS_MFSI_QUIET 0x40 /* Be silent if mount errors found */
251
252 static inline xfs_agnumber_t
xfs_daddr_to_agno(struct xfs_mount * mp,xfs_daddr_t d)253 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
254 {
255 xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
256 do_div(ld, mp->m_sb.sb_agblocks);
257 return (xfs_agnumber_t) ld;
258 }
259
260 static inline xfs_agblock_t
xfs_daddr_to_agbno(struct xfs_mount * mp,xfs_daddr_t d)261 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
262 {
263 xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
264 return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
265 }
266
267 /*
268 * Per-ag incore structure, copies of information in agf and agi, to improve the
269 * performance of allocation group selection.
270 */
271 typedef struct xfs_perag {
272 struct xfs_mount *pag_mount; /* owner filesystem */
273 xfs_agnumber_t pag_agno; /* AG this structure belongs to */
274 atomic_t pag_ref; /* perag reference count */
275 char pagf_init; /* this agf's entry is initialized */
276 char pagi_init; /* this agi's entry is initialized */
277 char pagf_metadata; /* the agf is preferred to be metadata */
278 char pagi_inodeok; /* The agi is ok for inodes */
279 __uint8_t pagf_levels[XFS_BTNUM_AGF];
280 /* # of levels in bno & cnt btree */
281 bool pagf_agflreset; /* agfl requires reset before use */
282 __uint32_t pagf_flcount; /* count of blocks in freelist */
283 xfs_extlen_t pagf_freeblks; /* total free blocks */
284 xfs_extlen_t pagf_longest; /* longest free space */
285 __uint32_t pagf_btreeblks; /* # of blocks held in AGF btrees */
286 xfs_agino_t pagi_freecount; /* number of free inodes */
287 xfs_agino_t pagi_count; /* number of allocated inodes */
288
289 /*
290 * Inode allocation search lookup optimisation.
291 * If the pagino matches, the search for new inodes
292 * doesn't need to search the near ones again straight away
293 */
294 xfs_agino_t pagl_pagino;
295 xfs_agino_t pagl_leftrec;
296 xfs_agino_t pagl_rightrec;
297 spinlock_t pagb_lock; /* lock for pagb_tree */
298 struct rb_root pagb_tree; /* ordered tree of busy extents */
299
300 atomic_t pagf_fstrms; /* # of filestreams active in this AG */
301
302 spinlock_t pag_ici_lock; /* incore inode cache lock */
303 struct radix_tree_root pag_ici_root; /* incore inode cache root */
304 int pag_ici_reclaimable; /* reclaimable inodes */
305 struct mutex pag_ici_reclaim_lock; /* serialisation point */
306 unsigned long pag_ici_reclaim_cursor; /* reclaim restart point */
307
308 /* buffer cache index */
309 spinlock_t pag_buf_lock; /* lock for pag_buf_tree */
310 struct rb_root pag_buf_tree; /* ordered tree of active buffers */
311
312 /* for rcu-safe freeing */
313 struct rcu_head rcu_head;
314 int pagb_count; /* pagb slots in use */
315 } xfs_perag_t;
316
317 extern void xfs_uuid_table_free(void);
318 extern int xfs_log_sbcount(xfs_mount_t *);
319 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
320 extern int xfs_mountfs(xfs_mount_t *mp);
321 extern int xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
322 xfs_agnumber_t *maxagi);
323 extern void xfs_unmountfs(xfs_mount_t *);
324
325 extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
326 extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
327 extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
328 bool reserved);
329 extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);
330
331 extern int xfs_mount_log_sb(xfs_mount_t *);
332 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
333 extern int xfs_readsb(xfs_mount_t *, int);
334 extern void xfs_freesb(xfs_mount_t *);
335 extern bool xfs_fs_writable(struct xfs_mount *mp, int level);
336 extern int xfs_sb_validate_fsb_count(struct xfs_sb *, __uint64_t);
337
338 extern int xfs_dev_is_read_only(struct xfs_mount *, char *);
339
340 extern void xfs_set_low_space_thresholds(struct xfs_mount *);
341
342 int xfs_zero_extent(struct xfs_inode *ip, xfs_fsblock_t start_fsb,
343 xfs_off_t count_fsb);
344
345 #endif /* __XFS_MOUNT_H__ */
346