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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_dir2.h" |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
1da177e4 | 30 | #include "xfs_bmap_btree.h" |
a844f451 | 31 | #include "xfs_alloc_btree.h" |
1da177e4 | 32 | #include "xfs_ialloc_btree.h" |
1da177e4 | 33 | #include "xfs_dir2_sf.h" |
a844f451 | 34 | #include "xfs_attr_sf.h" |
1da177e4 LT |
35 | #include "xfs_dinode.h" |
36 | #include "xfs_inode.h" | |
a844f451 NS |
37 | #include "xfs_btree.h" |
38 | #include "xfs_ialloc.h" | |
1da177e4 LT |
39 | #include "xfs_alloc.h" |
40 | #include "xfs_rtalloc.h" | |
41 | #include "xfs_bmap.h" | |
42 | #include "xfs_error.h" | |
1da177e4 LT |
43 | #include "xfs_rw.h" |
44 | #include "xfs_quota.h" | |
45 | #include "xfs_fsops.h" | |
46 | ||
47 | STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t); | |
48 | STATIC int xfs_uuid_mount(xfs_mount_t *); | |
49 | STATIC void xfs_uuid_unmount(xfs_mount_t *mp); | |
ba0f32d4 | 50 | STATIC void xfs_unmountfs_wait(xfs_mount_t *); |
1da177e4 | 51 | |
8d280b98 DC |
52 | |
53 | #ifdef HAVE_PERCPU_SB | |
54 | STATIC void xfs_icsb_destroy_counters(xfs_mount_t *); | |
20f4ebf2 DC |
55 | STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, |
56 | int, int); | |
8d280b98 DC |
57 | STATIC void xfs_icsb_sync_counters(xfs_mount_t *); |
58 | STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t, | |
20f4ebf2 | 59 | int64_t, int); |
e8234a68 | 60 | STATIC int xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t); |
8d280b98 DC |
61 | |
62 | #else | |
63 | ||
64 | #define xfs_icsb_destroy_counters(mp) do { } while (0) | |
20b64285 | 65 | #define xfs_icsb_balance_counter(mp, a, b, c) do { } while (0) |
8d280b98 DC |
66 | #define xfs_icsb_sync_counters(mp) do { } while (0) |
67 | #define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0) | |
8d280b98 DC |
68 | |
69 | #endif | |
70 | ||
1df84c93 | 71 | static const struct { |
8d280b98 DC |
72 | short offset; |
73 | short type; /* 0 = integer | |
74 | * 1 = binary / string (no translation) | |
75 | */ | |
1da177e4 LT |
76 | } xfs_sb_info[] = { |
77 | { offsetof(xfs_sb_t, sb_magicnum), 0 }, | |
78 | { offsetof(xfs_sb_t, sb_blocksize), 0 }, | |
79 | { offsetof(xfs_sb_t, sb_dblocks), 0 }, | |
80 | { offsetof(xfs_sb_t, sb_rblocks), 0 }, | |
81 | { offsetof(xfs_sb_t, sb_rextents), 0 }, | |
82 | { offsetof(xfs_sb_t, sb_uuid), 1 }, | |
83 | { offsetof(xfs_sb_t, sb_logstart), 0 }, | |
84 | { offsetof(xfs_sb_t, sb_rootino), 0 }, | |
85 | { offsetof(xfs_sb_t, sb_rbmino), 0 }, | |
86 | { offsetof(xfs_sb_t, sb_rsumino), 0 }, | |
87 | { offsetof(xfs_sb_t, sb_rextsize), 0 }, | |
88 | { offsetof(xfs_sb_t, sb_agblocks), 0 }, | |
89 | { offsetof(xfs_sb_t, sb_agcount), 0 }, | |
90 | { offsetof(xfs_sb_t, sb_rbmblocks), 0 }, | |
91 | { offsetof(xfs_sb_t, sb_logblocks), 0 }, | |
92 | { offsetof(xfs_sb_t, sb_versionnum), 0 }, | |
93 | { offsetof(xfs_sb_t, sb_sectsize), 0 }, | |
94 | { offsetof(xfs_sb_t, sb_inodesize), 0 }, | |
95 | { offsetof(xfs_sb_t, sb_inopblock), 0 }, | |
96 | { offsetof(xfs_sb_t, sb_fname[0]), 1 }, | |
97 | { offsetof(xfs_sb_t, sb_blocklog), 0 }, | |
98 | { offsetof(xfs_sb_t, sb_sectlog), 0 }, | |
99 | { offsetof(xfs_sb_t, sb_inodelog), 0 }, | |
100 | { offsetof(xfs_sb_t, sb_inopblog), 0 }, | |
101 | { offsetof(xfs_sb_t, sb_agblklog), 0 }, | |
102 | { offsetof(xfs_sb_t, sb_rextslog), 0 }, | |
103 | { offsetof(xfs_sb_t, sb_inprogress), 0 }, | |
104 | { offsetof(xfs_sb_t, sb_imax_pct), 0 }, | |
105 | { offsetof(xfs_sb_t, sb_icount), 0 }, | |
106 | { offsetof(xfs_sb_t, sb_ifree), 0 }, | |
107 | { offsetof(xfs_sb_t, sb_fdblocks), 0 }, | |
108 | { offsetof(xfs_sb_t, sb_frextents), 0 }, | |
109 | { offsetof(xfs_sb_t, sb_uquotino), 0 }, | |
110 | { offsetof(xfs_sb_t, sb_gquotino), 0 }, | |
111 | { offsetof(xfs_sb_t, sb_qflags), 0 }, | |
112 | { offsetof(xfs_sb_t, sb_flags), 0 }, | |
113 | { offsetof(xfs_sb_t, sb_shared_vn), 0 }, | |
114 | { offsetof(xfs_sb_t, sb_inoalignmt), 0 }, | |
115 | { offsetof(xfs_sb_t, sb_unit), 0 }, | |
116 | { offsetof(xfs_sb_t, sb_width), 0 }, | |
117 | { offsetof(xfs_sb_t, sb_dirblklog), 0 }, | |
118 | { offsetof(xfs_sb_t, sb_logsectlog), 0 }, | |
119 | { offsetof(xfs_sb_t, sb_logsectsize),0 }, | |
120 | { offsetof(xfs_sb_t, sb_logsunit), 0 }, | |
121 | { offsetof(xfs_sb_t, sb_features2), 0 }, | |
122 | { sizeof(xfs_sb_t), 0 } | |
123 | }; | |
124 | ||
125 | /* | |
126 | * Return a pointer to an initialized xfs_mount structure. | |
127 | */ | |
128 | xfs_mount_t * | |
129 | xfs_mount_init(void) | |
130 | { | |
131 | xfs_mount_t *mp; | |
132 | ||
8d280b98 DC |
133 | mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP); |
134 | ||
135 | if (xfs_icsb_init_counters(mp)) { | |
136 | mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB; | |
137 | } | |
1da177e4 LT |
138 | |
139 | AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail"); | |
140 | spinlock_init(&mp->m_sb_lock, "xfs_sb"); | |
794ee1ba | 141 | mutex_init(&mp->m_ilock); |
1da177e4 LT |
142 | initnsema(&mp->m_growlock, 1, "xfs_grow"); |
143 | /* | |
144 | * Initialize the AIL. | |
145 | */ | |
146 | xfs_trans_ail_init(mp); | |
147 | ||
148 | atomic_set(&mp->m_active_trans, 0); | |
149 | ||
150 | return mp; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Free up the resources associated with a mount structure. Assume that | |
155 | * the structure was initially zeroed, so we can tell which fields got | |
156 | * initialized. | |
157 | */ | |
158 | void | |
159 | xfs_mount_free( | |
8d280b98 DC |
160 | xfs_mount_t *mp, |
161 | int remove_bhv) | |
1da177e4 LT |
162 | { |
163 | if (mp->m_ihash) | |
164 | xfs_ihash_free(mp); | |
165 | if (mp->m_chash) | |
166 | xfs_chash_free(mp); | |
167 | ||
168 | if (mp->m_perag) { | |
169 | int agno; | |
170 | ||
171 | for (agno = 0; agno < mp->m_maxagi; agno++) | |
172 | if (mp->m_perag[agno].pagb_list) | |
173 | kmem_free(mp->m_perag[agno].pagb_list, | |
174 | sizeof(xfs_perag_busy_t) * | |
175 | XFS_PAGB_NUM_SLOTS); | |
176 | kmem_free(mp->m_perag, | |
177 | sizeof(xfs_perag_t) * mp->m_sb.sb_agcount); | |
178 | } | |
179 | ||
180 | AIL_LOCK_DESTROY(&mp->m_ail_lock); | |
181 | spinlock_destroy(&mp->m_sb_lock); | |
182 | mutex_destroy(&mp->m_ilock); | |
183 | freesema(&mp->m_growlock); | |
184 | if (mp->m_quotainfo) | |
185 | XFS_QM_DONE(mp); | |
186 | ||
187 | if (mp->m_fsname != NULL) | |
188 | kmem_free(mp->m_fsname, mp->m_fsname_len); | |
fc1f8c1c NS |
189 | if (mp->m_rtname != NULL) |
190 | kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1); | |
191 | if (mp->m_logname != NULL) | |
192 | kmem_free(mp->m_logname, strlen(mp->m_logname) + 1); | |
1da177e4 LT |
193 | |
194 | if (remove_bhv) { | |
b83bd138 | 195 | struct bhv_vfs *vfsp = XFS_MTOVFS(mp); |
1da177e4 LT |
196 | |
197 | bhv_remove_all_vfsops(vfsp, 0); | |
198 | VFS_REMOVEBHV(vfsp, &mp->m_bhv); | |
199 | } | |
200 | ||
8d280b98 | 201 | xfs_icsb_destroy_counters(mp); |
1da177e4 LT |
202 | kmem_free(mp, sizeof(xfs_mount_t)); |
203 | } | |
204 | ||
4cc929ee NS |
205 | /* |
206 | * Check size of device based on the (data/realtime) block count. | |
207 | * Note: this check is used by the growfs code as well as mount. | |
208 | */ | |
209 | int | |
210 | xfs_sb_validate_fsb_count( | |
211 | xfs_sb_t *sbp, | |
212 | __uint64_t nblocks) | |
213 | { | |
214 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); | |
215 | ASSERT(sbp->sb_blocklog >= BBSHIFT); | |
216 | ||
217 | #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ | |
218 | if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) | |
219 | return E2BIG; | |
220 | #else /* Limited by UINT_MAX of sectors */ | |
221 | if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX) | |
222 | return E2BIG; | |
223 | #endif | |
224 | return 0; | |
225 | } | |
1da177e4 LT |
226 | |
227 | /* | |
228 | * Check the validity of the SB found. | |
229 | */ | |
230 | STATIC int | |
231 | xfs_mount_validate_sb( | |
232 | xfs_mount_t *mp, | |
764d1f89 NS |
233 | xfs_sb_t *sbp, |
234 | int flags) | |
1da177e4 LT |
235 | { |
236 | /* | |
237 | * If the log device and data device have the | |
238 | * same device number, the log is internal. | |
239 | * Consequently, the sb_logstart should be non-zero. If | |
240 | * we have a zero sb_logstart in this case, we may be trying to mount | |
241 | * a volume filesystem in a non-volume manner. | |
242 | */ | |
243 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { | |
764d1f89 | 244 | xfs_fs_mount_cmn_err(flags, "bad magic number"); |
1da177e4 LT |
245 | return XFS_ERROR(EWRONGFS); |
246 | } | |
247 | ||
248 | if (!XFS_SB_GOOD_VERSION(sbp)) { | |
764d1f89 | 249 | xfs_fs_mount_cmn_err(flags, "bad version"); |
1da177e4 LT |
250 | return XFS_ERROR(EWRONGFS); |
251 | } | |
252 | ||
253 | if (unlikely( | |
254 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { | |
764d1f89 NS |
255 | xfs_fs_mount_cmn_err(flags, |
256 | "filesystem is marked as having an external log; " | |
257 | "specify logdev on the\nmount command line."); | |
258 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
259 | } |
260 | ||
261 | if (unlikely( | |
262 | sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { | |
764d1f89 NS |
263 | xfs_fs_mount_cmn_err(flags, |
264 | "filesystem is marked as having an internal log; " | |
265 | "do not specify logdev on\nthe mount command line."); | |
266 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
267 | } |
268 | ||
269 | /* | |
270 | * More sanity checking. These were stolen directly from | |
271 | * xfs_repair. | |
272 | */ | |
273 | if (unlikely( | |
274 | sbp->sb_agcount <= 0 || | |
275 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
276 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
277 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
278 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
279 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || | |
280 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
281 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
282 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
283 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || | |
284 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
9f989c94 NS |
285 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || |
286 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
287 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || | |
1da177e4 LT |
288 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || |
289 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
e50bd16f | 290 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) { |
764d1f89 | 291 | xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed"); |
1da177e4 LT |
292 | return XFS_ERROR(EFSCORRUPTED); |
293 | } | |
294 | ||
295 | /* | |
296 | * Sanity check AG count, size fields against data size field | |
297 | */ | |
298 | if (unlikely( | |
299 | sbp->sb_dblocks == 0 || | |
300 | sbp->sb_dblocks > | |
301 | (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks || | |
302 | sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) * | |
303 | sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) { | |
764d1f89 | 304 | xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed"); |
1da177e4 LT |
305 | return XFS_ERROR(EFSCORRUPTED); |
306 | } | |
307 | ||
4cc929ee NS |
308 | if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || |
309 | xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { | |
764d1f89 NS |
310 | xfs_fs_mount_cmn_err(flags, |
311 | "file system too large to be mounted on this system."); | |
1da177e4 LT |
312 | return XFS_ERROR(E2BIG); |
313 | } | |
314 | ||
315 | if (unlikely(sbp->sb_inprogress)) { | |
764d1f89 | 316 | xfs_fs_mount_cmn_err(flags, "file system busy"); |
1da177e4 LT |
317 | return XFS_ERROR(EFSCORRUPTED); |
318 | } | |
319 | ||
de20614b NS |
320 | /* |
321 | * Version 1 directory format has never worked on Linux. | |
322 | */ | |
323 | if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) { | |
764d1f89 NS |
324 | xfs_fs_mount_cmn_err(flags, |
325 | "file system using version 1 directory format"); | |
de20614b NS |
326 | return XFS_ERROR(ENOSYS); |
327 | } | |
328 | ||
1da177e4 LT |
329 | /* |
330 | * Until this is fixed only page-sized or smaller data blocks work. | |
331 | */ | |
332 | if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { | |
764d1f89 NS |
333 | xfs_fs_mount_cmn_err(flags, |
334 | "file system with blocksize %d bytes", | |
1da177e4 | 335 | sbp->sb_blocksize); |
764d1f89 NS |
336 | xfs_fs_mount_cmn_err(flags, |
337 | "only pagesize (%ld) or less will currently work.", | |
1da177e4 LT |
338 | PAGE_SIZE); |
339 | return XFS_ERROR(ENOSYS); | |
340 | } | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | xfs_agnumber_t | |
c11e2c36 | 346 | xfs_initialize_perag( |
b83bd138 | 347 | bhv_vfs_t *vfs, |
c11e2c36 NS |
348 | xfs_mount_t *mp, |
349 | xfs_agnumber_t agcount) | |
1da177e4 LT |
350 | { |
351 | xfs_agnumber_t index, max_metadata; | |
352 | xfs_perag_t *pag; | |
353 | xfs_agino_t agino; | |
354 | xfs_ino_t ino; | |
355 | xfs_sb_t *sbp = &mp->m_sb; | |
356 | xfs_ino_t max_inum = XFS_MAXINUMBER_32; | |
357 | ||
358 | /* Check to see if the filesystem can overflow 32 bit inodes */ | |
359 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); | |
360 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); | |
361 | ||
362 | /* Clear the mount flag if no inode can overflow 32 bits | |
363 | * on this filesystem, or if specifically requested.. | |
364 | */ | |
c11e2c36 | 365 | if ((vfs->vfs_flag & VFS_32BITINODES) && ino > max_inum) { |
1da177e4 LT |
366 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
367 | } else { | |
368 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; | |
369 | } | |
370 | ||
371 | /* If we can overflow then setup the ag headers accordingly */ | |
372 | if (mp->m_flags & XFS_MOUNT_32BITINODES) { | |
373 | /* Calculate how much should be reserved for inodes to | |
374 | * meet the max inode percentage. | |
375 | */ | |
376 | if (mp->m_maxicount) { | |
377 | __uint64_t icount; | |
378 | ||
379 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
380 | do_div(icount, 100); | |
381 | icount += sbp->sb_agblocks - 1; | |
a749ee86 | 382 | do_div(icount, sbp->sb_agblocks); |
1da177e4 LT |
383 | max_metadata = icount; |
384 | } else { | |
385 | max_metadata = agcount; | |
386 | } | |
387 | for (index = 0; index < agcount; index++) { | |
388 | ino = XFS_AGINO_TO_INO(mp, index, agino); | |
389 | if (ino > max_inum) { | |
390 | index++; | |
391 | break; | |
392 | } | |
393 | ||
c41564b5 | 394 | /* This ag is preferred for inodes */ |
1da177e4 LT |
395 | pag = &mp->m_perag[index]; |
396 | pag->pagi_inodeok = 1; | |
397 | if (index < max_metadata) | |
398 | pag->pagf_metadata = 1; | |
399 | } | |
400 | } else { | |
401 | /* Setup default behavior for smaller filesystems */ | |
402 | for (index = 0; index < agcount; index++) { | |
403 | pag = &mp->m_perag[index]; | |
404 | pag->pagi_inodeok = 1; | |
405 | } | |
406 | } | |
407 | return index; | |
408 | } | |
409 | ||
410 | /* | |
411 | * xfs_xlatesb | |
412 | * | |
413 | * data - on disk version of sb | |
414 | * sb - a superblock | |
415 | * dir - conversion direction: <0 - convert sb to buf | |
416 | * >0 - convert buf to sb | |
417 | * fields - which fields to copy (bitmask) | |
418 | */ | |
419 | void | |
420 | xfs_xlatesb( | |
421 | void *data, | |
422 | xfs_sb_t *sb, | |
423 | int dir, | |
424 | __int64_t fields) | |
425 | { | |
426 | xfs_caddr_t buf_ptr; | |
427 | xfs_caddr_t mem_ptr; | |
428 | xfs_sb_field_t f; | |
429 | int first; | |
430 | int size; | |
431 | ||
432 | ASSERT(dir); | |
433 | ASSERT(fields); | |
434 | ||
435 | if (!fields) | |
436 | return; | |
437 | ||
438 | buf_ptr = (xfs_caddr_t)data; | |
439 | mem_ptr = (xfs_caddr_t)sb; | |
440 | ||
441 | while (fields) { | |
442 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
443 | first = xfs_sb_info[f].offset; | |
444 | size = xfs_sb_info[f + 1].offset - first; | |
445 | ||
446 | ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); | |
447 | ||
448 | if (size == 1 || xfs_sb_info[f].type == 1) { | |
449 | if (dir > 0) { | |
450 | memcpy(mem_ptr + first, buf_ptr + first, size); | |
451 | } else { | |
452 | memcpy(buf_ptr + first, mem_ptr + first, size); | |
453 | } | |
454 | } else { | |
455 | switch (size) { | |
456 | case 2: | |
457 | INT_XLATE(*(__uint16_t*)(buf_ptr+first), | |
458 | *(__uint16_t*)(mem_ptr+first), | |
459 | dir, ARCH_CONVERT); | |
460 | break; | |
461 | case 4: | |
462 | INT_XLATE(*(__uint32_t*)(buf_ptr+first), | |
463 | *(__uint32_t*)(mem_ptr+first), | |
464 | dir, ARCH_CONVERT); | |
465 | break; | |
466 | case 8: | |
467 | INT_XLATE(*(__uint64_t*)(buf_ptr+first), | |
468 | *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT); | |
469 | break; | |
470 | default: | |
471 | ASSERT(0); | |
472 | } | |
473 | } | |
474 | ||
475 | fields &= ~(1LL << f); | |
476 | } | |
477 | } | |
478 | ||
479 | /* | |
480 | * xfs_readsb | |
481 | * | |
482 | * Does the initial read of the superblock. | |
483 | */ | |
484 | int | |
764d1f89 | 485 | xfs_readsb(xfs_mount_t *mp, int flags) |
1da177e4 LT |
486 | { |
487 | unsigned int sector_size; | |
488 | unsigned int extra_flags; | |
489 | xfs_buf_t *bp; | |
490 | xfs_sb_t *sbp; | |
491 | int error; | |
492 | ||
493 | ASSERT(mp->m_sb_bp == NULL); | |
494 | ASSERT(mp->m_ddev_targp != NULL); | |
495 | ||
496 | /* | |
497 | * Allocate a (locked) buffer to hold the superblock. | |
498 | * This will be kept around at all times to optimize | |
499 | * access to the superblock. | |
500 | */ | |
501 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); | |
502 | extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED; | |
503 | ||
504 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
505 | BTOBB(sector_size), extra_flags); | |
506 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 507 | xfs_fs_mount_cmn_err(flags, "SB read failed"); |
1da177e4 LT |
508 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
509 | goto fail; | |
510 | } | |
511 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
512 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
513 | ||
514 | /* | |
515 | * Initialize the mount structure from the superblock. | |
516 | * But first do some basic consistency checking. | |
517 | */ | |
518 | sbp = XFS_BUF_TO_SBP(bp); | |
519 | xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS); | |
520 | ||
764d1f89 | 521 | error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags); |
1da177e4 | 522 | if (error) { |
764d1f89 | 523 | xfs_fs_mount_cmn_err(flags, "SB validate failed"); |
1da177e4 LT |
524 | goto fail; |
525 | } | |
526 | ||
527 | /* | |
528 | * We must be able to do sector-sized and sector-aligned IO. | |
529 | */ | |
530 | if (sector_size > mp->m_sb.sb_sectsize) { | |
764d1f89 NS |
531 | xfs_fs_mount_cmn_err(flags, |
532 | "device supports only %u byte sectors (not %u)", | |
1da177e4 LT |
533 | sector_size, mp->m_sb.sb_sectsize); |
534 | error = ENOSYS; | |
535 | goto fail; | |
536 | } | |
537 | ||
538 | /* | |
539 | * If device sector size is smaller than the superblock size, | |
540 | * re-read the superblock so the buffer is correctly sized. | |
541 | */ | |
542 | if (sector_size < mp->m_sb.sb_sectsize) { | |
543 | XFS_BUF_UNMANAGE(bp); | |
544 | xfs_buf_relse(bp); | |
545 | sector_size = mp->m_sb.sb_sectsize; | |
546 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
547 | BTOBB(sector_size), extra_flags); | |
548 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 549 | xfs_fs_mount_cmn_err(flags, "SB re-read failed"); |
1da177e4 LT |
550 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
551 | goto fail; | |
552 | } | |
553 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
554 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
555 | } | |
556 | ||
5478eead LM |
557 | /* Initialize per-cpu counters */ |
558 | xfs_icsb_reinit_counters(mp); | |
8d280b98 | 559 | |
1da177e4 LT |
560 | mp->m_sb_bp = bp; |
561 | xfs_buf_relse(bp); | |
562 | ASSERT(XFS_BUF_VALUSEMA(bp) > 0); | |
563 | return 0; | |
564 | ||
565 | fail: | |
566 | if (bp) { | |
567 | XFS_BUF_UNMANAGE(bp); | |
568 | xfs_buf_relse(bp); | |
569 | } | |
570 | return error; | |
571 | } | |
572 | ||
573 | ||
574 | /* | |
575 | * xfs_mount_common | |
576 | * | |
577 | * Mount initialization code establishing various mount | |
578 | * fields from the superblock associated with the given | |
579 | * mount structure | |
580 | */ | |
ba0f32d4 | 581 | STATIC void |
1da177e4 LT |
582 | xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) |
583 | { | |
584 | int i; | |
585 | ||
586 | mp->m_agfrotor = mp->m_agirotor = 0; | |
587 | spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock"); | |
588 | mp->m_maxagi = mp->m_sb.sb_agcount; | |
589 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
590 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
591 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
592 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
593 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
594 | mp->m_litino = sbp->sb_inodesize - | |
595 | ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t)); | |
596 | mp->m_blockmask = sbp->sb_blocksize - 1; | |
597 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
598 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
599 | INIT_LIST_HEAD(&mp->m_del_inodes); | |
600 | ||
601 | /* | |
602 | * Setup for attributes, in case they get created. | |
603 | * This value is for inodes getting attributes for the first time, | |
604 | * the per-inode value is for old attribute values. | |
605 | */ | |
606 | ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048); | |
607 | switch (sbp->sb_inodesize) { | |
608 | case 256: | |
d8cc890d NS |
609 | mp->m_attroffset = XFS_LITINO(mp) - |
610 | XFS_BMDR_SPACE_CALC(MINABTPTRS); | |
1da177e4 LT |
611 | break; |
612 | case 512: | |
613 | case 1024: | |
614 | case 2048: | |
d8cc890d | 615 | mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS); |
1da177e4 LT |
616 | break; |
617 | default: | |
618 | ASSERT(0); | |
619 | } | |
620 | ASSERT(mp->m_attroffset < XFS_LITINO(mp)); | |
621 | ||
622 | for (i = 0; i < 2; i++) { | |
623 | mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
624 | xfs_alloc, i == 0); | |
625 | mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
626 | xfs_alloc, i == 0); | |
627 | } | |
628 | for (i = 0; i < 2; i++) { | |
629 | mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
630 | xfs_bmbt, i == 0); | |
631 | mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
632 | xfs_bmbt, i == 0); | |
633 | } | |
634 | for (i = 0; i < 2; i++) { | |
635 | mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
636 | xfs_inobt, i == 0); | |
637 | mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
638 | xfs_inobt, i == 0); | |
639 | } | |
640 | ||
641 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
642 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
643 | sbp->sb_inopblock); | |
644 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
645 | } | |
646 | /* | |
647 | * xfs_mountfs | |
648 | * | |
649 | * This function does the following on an initial mount of a file system: | |
650 | * - reads the superblock from disk and init the mount struct | |
651 | * - if we're a 32-bit kernel, do a size check on the superblock | |
652 | * so we don't mount terabyte filesystems | |
653 | * - init mount struct realtime fields | |
654 | * - allocate inode hash table for fs | |
655 | * - init directory manager | |
656 | * - perform recovery and init the log manager | |
657 | */ | |
658 | int | |
659 | xfs_mountfs( | |
b83bd138 | 660 | bhv_vfs_t *vfsp, |
1da177e4 LT |
661 | xfs_mount_t *mp, |
662 | int mfsi_flags) | |
663 | { | |
664 | xfs_buf_t *bp; | |
665 | xfs_sb_t *sbp = &(mp->m_sb); | |
666 | xfs_inode_t *rip; | |
67fcaa73 | 667 | bhv_vnode_t *rvp = NULL; |
1da177e4 LT |
668 | int readio_log, writeio_log; |
669 | xfs_daddr_t d; | |
670 | __uint64_t ret64; | |
671 | __int64_t update_flags; | |
672 | uint quotamount, quotaflags; | |
673 | int agno; | |
674 | int uuid_mounted = 0; | |
675 | int error = 0; | |
676 | ||
677 | if (mp->m_sb_bp == NULL) { | |
764d1f89 | 678 | if ((error = xfs_readsb(mp, mfsi_flags))) { |
014c2544 | 679 | return error; |
1da177e4 LT |
680 | } |
681 | } | |
682 | xfs_mount_common(mp, sbp); | |
683 | ||
684 | /* | |
685 | * Check if sb_agblocks is aligned at stripe boundary | |
686 | * If sb_agblocks is NOT aligned turn off m_dalign since | |
687 | * allocator alignment is within an ag, therefore ag has | |
688 | * to be aligned at stripe boundary. | |
689 | */ | |
690 | update_flags = 0LL; | |
691 | if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) { | |
692 | /* | |
693 | * If stripe unit and stripe width are not multiples | |
694 | * of the fs blocksize turn off alignment. | |
695 | */ | |
696 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || | |
697 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { | |
698 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
699 | cmn_err(CE_WARN, | |
700 | "XFS: alignment check 1 failed"); | |
701 | error = XFS_ERROR(EINVAL); | |
702 | goto error1; | |
703 | } | |
704 | mp->m_dalign = mp->m_swidth = 0; | |
705 | } else { | |
706 | /* | |
707 | * Convert the stripe unit and width to FSBs. | |
708 | */ | |
709 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); | |
710 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { | |
711 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
712 | error = XFS_ERROR(EINVAL); | |
713 | goto error1; | |
714 | } | |
715 | xfs_fs_cmn_err(CE_WARN, mp, | |
716 | "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)", | |
717 | mp->m_dalign, mp->m_swidth, | |
718 | sbp->sb_agblocks); | |
719 | ||
720 | mp->m_dalign = 0; | |
721 | mp->m_swidth = 0; | |
722 | } else if (mp->m_dalign) { | |
723 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); | |
724 | } else { | |
725 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
726 | xfs_fs_cmn_err(CE_WARN, mp, | |
727 | "stripe alignment turned off: sunit(%d) less than bsize(%d)", | |
728 | mp->m_dalign, | |
729 | mp->m_blockmask +1); | |
730 | error = XFS_ERROR(EINVAL); | |
731 | goto error1; | |
732 | } | |
733 | mp->m_swidth = 0; | |
734 | } | |
735 | } | |
736 | ||
737 | /* | |
738 | * Update superblock with new values | |
739 | * and log changes | |
740 | */ | |
741 | if (XFS_SB_VERSION_HASDALIGN(sbp)) { | |
742 | if (sbp->sb_unit != mp->m_dalign) { | |
743 | sbp->sb_unit = mp->m_dalign; | |
744 | update_flags |= XFS_SB_UNIT; | |
745 | } | |
746 | if (sbp->sb_width != mp->m_swidth) { | |
747 | sbp->sb_width = mp->m_swidth; | |
748 | update_flags |= XFS_SB_WIDTH; | |
749 | } | |
750 | } | |
751 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && | |
752 | XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) { | |
753 | mp->m_dalign = sbp->sb_unit; | |
754 | mp->m_swidth = sbp->sb_width; | |
755 | } | |
756 | ||
757 | xfs_alloc_compute_maxlevels(mp); | |
758 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); | |
759 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); | |
760 | xfs_ialloc_compute_maxlevels(mp); | |
761 | ||
762 | if (sbp->sb_imax_pct) { | |
763 | __uint64_t icount; | |
764 | ||
765 | /* Make sure the maximum inode count is a multiple of the | |
766 | * units we allocate inodes in. | |
767 | */ | |
768 | ||
769 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
770 | do_div(icount, 100); | |
771 | do_div(icount, mp->m_ialloc_blks); | |
772 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << | |
773 | sbp->sb_inopblog; | |
774 | } else | |
775 | mp->m_maxicount = 0; | |
776 | ||
777 | mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog); | |
778 | ||
779 | /* | |
780 | * XFS uses the uuid from the superblock as the unique | |
781 | * identifier for fsid. We can not use the uuid from the volume | |
782 | * since a single partition filesystem is identical to a single | |
783 | * partition volume/filesystem. | |
784 | */ | |
785 | if ((mfsi_flags & XFS_MFSI_SECOND) == 0 && | |
786 | (mp->m_flags & XFS_MOUNT_NOUUID) == 0) { | |
787 | if (xfs_uuid_mount(mp)) { | |
788 | error = XFS_ERROR(EINVAL); | |
789 | goto error1; | |
790 | } | |
791 | uuid_mounted=1; | |
792 | ret64 = uuid_hash64(&sbp->sb_uuid); | |
793 | memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64)); | |
794 | } | |
795 | ||
796 | /* | |
797 | * Set the default minimum read and write sizes unless | |
798 | * already specified in a mount option. | |
799 | * We use smaller I/O sizes when the file system | |
800 | * is being used for NFS service (wsync mount option). | |
801 | */ | |
802 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { | |
803 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
804 | readio_log = XFS_WSYNC_READIO_LOG; | |
805 | writeio_log = XFS_WSYNC_WRITEIO_LOG; | |
806 | } else { | |
807 | readio_log = XFS_READIO_LOG_LARGE; | |
808 | writeio_log = XFS_WRITEIO_LOG_LARGE; | |
809 | } | |
810 | } else { | |
811 | readio_log = mp->m_readio_log; | |
812 | writeio_log = mp->m_writeio_log; | |
813 | } | |
814 | ||
815 | /* | |
816 | * Set the number of readahead buffers to use based on | |
817 | * physical memory size. | |
818 | */ | |
819 | if (xfs_physmem <= 4096) /* <= 16MB */ | |
820 | mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB; | |
821 | else if (xfs_physmem <= 8192) /* <= 32MB */ | |
822 | mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB; | |
823 | else | |
824 | mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32; | |
825 | if (sbp->sb_blocklog > readio_log) { | |
826 | mp->m_readio_log = sbp->sb_blocklog; | |
827 | } else { | |
828 | mp->m_readio_log = readio_log; | |
829 | } | |
830 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); | |
831 | if (sbp->sb_blocklog > writeio_log) { | |
832 | mp->m_writeio_log = sbp->sb_blocklog; | |
833 | } else { | |
834 | mp->m_writeio_log = writeio_log; | |
835 | } | |
836 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); | |
837 | ||
838 | /* | |
839 | * Set the inode cluster size based on the physical memory | |
840 | * size. This may still be overridden by the file system | |
841 | * block size if it is larger than the chosen cluster size. | |
842 | */ | |
843 | if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */ | |
844 | mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE; | |
845 | } else { | |
846 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; | |
847 | } | |
848 | /* | |
849 | * Set whether we're using inode alignment. | |
850 | */ | |
851 | if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) && | |
852 | mp->m_sb.sb_inoalignmt >= | |
853 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) | |
854 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; | |
855 | else | |
856 | mp->m_inoalign_mask = 0; | |
857 | /* | |
858 | * If we are using stripe alignment, check whether | |
859 | * the stripe unit is a multiple of the inode alignment | |
860 | */ | |
861 | if (mp->m_dalign && mp->m_inoalign_mask && | |
862 | !(mp->m_dalign & mp->m_inoalign_mask)) | |
863 | mp->m_sinoalign = mp->m_dalign; | |
864 | else | |
865 | mp->m_sinoalign = 0; | |
866 | /* | |
867 | * Check that the data (and log if separate) are an ok size. | |
868 | */ | |
869 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); | |
870 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { | |
871 | cmn_err(CE_WARN, "XFS: size check 1 failed"); | |
872 | error = XFS_ERROR(E2BIG); | |
873 | goto error1; | |
874 | } | |
875 | error = xfs_read_buf(mp, mp->m_ddev_targp, | |
876 | d - XFS_FSS_TO_BB(mp, 1), | |
877 | XFS_FSS_TO_BB(mp, 1), 0, &bp); | |
878 | if (!error) { | |
879 | xfs_buf_relse(bp); | |
880 | } else { | |
881 | cmn_err(CE_WARN, "XFS: size check 2 failed"); | |
882 | if (error == ENOSPC) { | |
883 | error = XFS_ERROR(E2BIG); | |
884 | } | |
885 | goto error1; | |
886 | } | |
887 | ||
888 | if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) && | |
889 | mp->m_logdev_targp != mp->m_ddev_targp) { | |
890 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); | |
891 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { | |
892 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
893 | error = XFS_ERROR(E2BIG); | |
894 | goto error1; | |
895 | } | |
896 | error = xfs_read_buf(mp, mp->m_logdev_targp, | |
897 | d - XFS_FSB_TO_BB(mp, 1), | |
898 | XFS_FSB_TO_BB(mp, 1), 0, &bp); | |
899 | if (!error) { | |
900 | xfs_buf_relse(bp); | |
901 | } else { | |
902 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
903 | if (error == ENOSPC) { | |
904 | error = XFS_ERROR(E2BIG); | |
905 | } | |
906 | goto error1; | |
907 | } | |
908 | } | |
909 | ||
910 | /* | |
911 | * Initialize realtime fields in the mount structure | |
912 | */ | |
913 | if ((error = xfs_rtmount_init(mp))) { | |
914 | cmn_err(CE_WARN, "XFS: RT mount failed"); | |
915 | goto error1; | |
916 | } | |
917 | ||
918 | /* | |
919 | * For client case we are done now | |
920 | */ | |
921 | if (mfsi_flags & XFS_MFSI_CLIENT) { | |
014c2544 | 922 | return 0; |
1da177e4 LT |
923 | } |
924 | ||
925 | /* | |
926 | * Copies the low order bits of the timestamp and the randomly | |
927 | * set "sequence" number out of a UUID. | |
928 | */ | |
929 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); | |
930 | ||
931 | /* | |
932 | * The vfs structure needs to have a file system independent | |
933 | * way of checking for the invariant file system ID. Since it | |
934 | * can't look at mount structures it has a pointer to the data | |
935 | * in the mount structure. | |
936 | * | |
937 | * File systems that don't support user level file handles (i.e. | |
938 | * all of them except for XFS) will leave vfs_altfsid as NULL. | |
939 | */ | |
940 | vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid; | |
941 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ | |
942 | ||
f6c2d1fa | 943 | xfs_dir_mount(mp); |
1da177e4 LT |
944 | |
945 | /* | |
946 | * Initialize the attribute manager's entries. | |
947 | */ | |
948 | mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; | |
949 | ||
950 | /* | |
951 | * Initialize the precomputed transaction reservations values. | |
952 | */ | |
953 | xfs_trans_init(mp); | |
954 | ||
955 | /* | |
956 | * Allocate and initialize the inode hash table for this | |
957 | * file system. | |
958 | */ | |
959 | xfs_ihash_init(mp); | |
960 | xfs_chash_init(mp); | |
961 | ||
962 | /* | |
963 | * Allocate and initialize the per-ag data. | |
964 | */ | |
965 | init_rwsem(&mp->m_peraglock); | |
966 | mp->m_perag = | |
967 | kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP); | |
968 | ||
c11e2c36 | 969 | mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount); |
1da177e4 LT |
970 | |
971 | /* | |
972 | * log's mount-time initialization. Perform 1st part recovery if needed | |
973 | */ | |
974 | if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */ | |
975 | error = xfs_log_mount(mp, mp->m_logdev_targp, | |
976 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), | |
977 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); | |
978 | if (error) { | |
979 | cmn_err(CE_WARN, "XFS: log mount failed"); | |
980 | goto error2; | |
981 | } | |
982 | } else { /* No log has been defined */ | |
983 | cmn_err(CE_WARN, "XFS: no log defined"); | |
984 | XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp); | |
985 | error = XFS_ERROR(EFSCORRUPTED); | |
986 | goto error2; | |
987 | } | |
988 | ||
989 | /* | |
990 | * Get and sanity-check the root inode. | |
991 | * Save the pointer to it in the mount structure. | |
992 | */ | |
993 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0); | |
994 | if (error) { | |
995 | cmn_err(CE_WARN, "XFS: failed to read root inode"); | |
996 | goto error3; | |
997 | } | |
998 | ||
999 | ASSERT(rip != NULL); | |
1000 | rvp = XFS_ITOV(rip); | |
1001 | ||
1002 | if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) { | |
1003 | cmn_err(CE_WARN, "XFS: corrupted root inode"); | |
b6574520 NS |
1004 | cmn_err(CE_WARN, "Device %s - root %llu is not a directory", |
1005 | XFS_BUFTARG_NAME(mp->m_ddev_targp), | |
1006 | (unsigned long long)rip->i_ino); | |
1da177e4 LT |
1007 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
1008 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, | |
1009 | mp); | |
1010 | error = XFS_ERROR(EFSCORRUPTED); | |
1011 | goto error4; | |
1012 | } | |
1013 | mp->m_rootip = rip; /* save it */ | |
1014 | ||
1015 | xfs_iunlock(rip, XFS_ILOCK_EXCL); | |
1016 | ||
1017 | /* | |
1018 | * Initialize realtime inode pointers in the mount structure | |
1019 | */ | |
1020 | if ((error = xfs_rtmount_inodes(mp))) { | |
1021 | /* | |
1022 | * Free up the root inode. | |
1023 | */ | |
1024 | cmn_err(CE_WARN, "XFS: failed to read RT inodes"); | |
1025 | goto error4; | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * If fs is not mounted readonly, then update the superblock | |
1030 | * unit and width changes. | |
1031 | */ | |
1032 | if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY)) | |
1033 | xfs_mount_log_sbunit(mp, update_flags); | |
1034 | ||
1035 | /* | |
1036 | * Initialise the XFS quota management subsystem for this mount | |
1037 | */ | |
1038 | if ((error = XFS_QM_INIT(mp, "amount, "aflags))) | |
1039 | goto error4; | |
1040 | ||
1041 | /* | |
1042 | * Finish recovering the file system. This part needed to be | |
1043 | * delayed until after the root and real-time bitmap inodes | |
1044 | * were consistently read in. | |
1045 | */ | |
1046 | error = xfs_log_mount_finish(mp, mfsi_flags); | |
1047 | if (error) { | |
1048 | cmn_err(CE_WARN, "XFS: log mount finish failed"); | |
1049 | goto error4; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Complete the quota initialisation, post-log-replay component. | |
1054 | */ | |
1055 | if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags))) | |
1056 | goto error4; | |
1057 | ||
1058 | return 0; | |
1059 | ||
1060 | error4: | |
1061 | /* | |
1062 | * Free up the root inode. | |
1063 | */ | |
1064 | VN_RELE(rvp); | |
1065 | error3: | |
1066 | xfs_log_unmount_dealloc(mp); | |
1067 | error2: | |
1068 | xfs_ihash_free(mp); | |
1069 | xfs_chash_free(mp); | |
1070 | for (agno = 0; agno < sbp->sb_agcount; agno++) | |
1071 | if (mp->m_perag[agno].pagb_list) | |
1072 | kmem_free(mp->m_perag[agno].pagb_list, | |
1073 | sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS); | |
1074 | kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t)); | |
1075 | mp->m_perag = NULL; | |
1076 | /* FALLTHROUGH */ | |
1077 | error1: | |
1078 | if (uuid_mounted) | |
1079 | xfs_uuid_unmount(mp); | |
1080 | xfs_freesb(mp); | |
1081 | return error; | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * xfs_unmountfs | |
1086 | * | |
1087 | * This flushes out the inodes,dquots and the superblock, unmounts the | |
1088 | * log and makes sure that incore structures are freed. | |
1089 | */ | |
1090 | int | |
1091 | xfs_unmountfs(xfs_mount_t *mp, struct cred *cr) | |
1092 | { | |
b83bd138 | 1093 | struct bhv_vfs *vfsp = XFS_MTOVFS(mp); |
1da177e4 LT |
1094 | #if defined(DEBUG) || defined(INDUCE_IO_ERROR) |
1095 | int64_t fsid; | |
1096 | #endif | |
1097 | ||
efa80278 | 1098 | xfs_iflush_all(mp); |
1da177e4 | 1099 | |
ee2a4f7c | 1100 | XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING); |
1da177e4 LT |
1101 | |
1102 | /* | |
1103 | * Flush out the log synchronously so that we know for sure | |
1104 | * that nothing is pinned. This is important because bflush() | |
1105 | * will skip pinned buffers. | |
1106 | */ | |
1107 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
1108 | ||
1109 | xfs_binval(mp->m_ddev_targp); | |
1110 | if (mp->m_rtdev_targp) { | |
1111 | xfs_binval(mp->m_rtdev_targp); | |
1112 | } | |
1113 | ||
1114 | xfs_unmountfs_writesb(mp); | |
1115 | ||
1116 | xfs_unmountfs_wait(mp); /* wait for async bufs */ | |
1117 | ||
1118 | xfs_log_unmount(mp); /* Done! No more fs ops. */ | |
1119 | ||
1120 | xfs_freesb(mp); | |
1121 | ||
1122 | /* | |
1123 | * All inodes from this mount point should be freed. | |
1124 | */ | |
1125 | ASSERT(mp->m_inodes == NULL); | |
1126 | ||
1da177e4 LT |
1127 | xfs_unmountfs_close(mp, cr); |
1128 | if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0) | |
1129 | xfs_uuid_unmount(mp); | |
1130 | ||
1131 | #if defined(DEBUG) || defined(INDUCE_IO_ERROR) | |
1132 | /* | |
1133 | * clear all error tags on this filesystem | |
1134 | */ | |
1135 | memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t)); | |
1136 | xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0); | |
1137 | #endif | |
1138 | XFS_IODONE(vfsp); | |
1139 | xfs_mount_free(mp, 1); | |
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | void | |
1144 | xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr) | |
1145 | { | |
1146 | if (mp->m_logdev_targp != mp->m_ddev_targp) | |
1147 | xfs_free_buftarg(mp->m_logdev_targp, 1); | |
1148 | if (mp->m_rtdev_targp) | |
1149 | xfs_free_buftarg(mp->m_rtdev_targp, 1); | |
1150 | xfs_free_buftarg(mp->m_ddev_targp, 0); | |
1151 | } | |
1152 | ||
ba0f32d4 | 1153 | STATIC void |
1da177e4 LT |
1154 | xfs_unmountfs_wait(xfs_mount_t *mp) |
1155 | { | |
1156 | if (mp->m_logdev_targp != mp->m_ddev_targp) | |
1157 | xfs_wait_buftarg(mp->m_logdev_targp); | |
1158 | if (mp->m_rtdev_targp) | |
1159 | xfs_wait_buftarg(mp->m_rtdev_targp); | |
1160 | xfs_wait_buftarg(mp->m_ddev_targp); | |
1161 | } | |
1162 | ||
1163 | int | |
1164 | xfs_unmountfs_writesb(xfs_mount_t *mp) | |
1165 | { | |
1166 | xfs_buf_t *sbp; | |
1167 | xfs_sb_t *sb; | |
1168 | int error = 0; | |
1169 | ||
1170 | /* | |
1171 | * skip superblock write if fs is read-only, or | |
1172 | * if we are doing a forced umount. | |
1173 | */ | |
1174 | sbp = xfs_getsb(mp, 0); | |
1175 | if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY || | |
1176 | XFS_FORCED_SHUTDOWN(mp))) { | |
8d280b98 DC |
1177 | |
1178 | xfs_icsb_sync_counters(mp); | |
1179 | ||
1da177e4 LT |
1180 | /* |
1181 | * mark shared-readonly if desired | |
1182 | */ | |
1183 | sb = XFS_BUF_TO_SBP(sbp); | |
1184 | if (mp->m_mk_sharedro) { | |
1185 | if (!(sb->sb_flags & XFS_SBF_READONLY)) | |
1186 | sb->sb_flags |= XFS_SBF_READONLY; | |
1187 | if (!XFS_SB_VERSION_HASSHARED(sb)) | |
1188 | XFS_SB_VERSION_ADDSHARED(sb); | |
1189 | xfs_fs_cmn_err(CE_NOTE, mp, | |
1190 | "Unmounting, marking shared read-only"); | |
1191 | } | |
1192 | XFS_BUF_UNDONE(sbp); | |
1193 | XFS_BUF_UNREAD(sbp); | |
1194 | XFS_BUF_UNDELAYWRITE(sbp); | |
1195 | XFS_BUF_WRITE(sbp); | |
1196 | XFS_BUF_UNASYNC(sbp); | |
1197 | ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp); | |
1198 | xfsbdstrat(mp, sbp); | |
1199 | /* Nevermind errors we might get here. */ | |
1200 | error = xfs_iowait(sbp); | |
1201 | if (error) | |
1202 | xfs_ioerror_alert("xfs_unmountfs_writesb", | |
1203 | mp, sbp, XFS_BUF_ADDR(sbp)); | |
1204 | if (error && mp->m_mk_sharedro) | |
1205 | xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly"); | |
1206 | } | |
1207 | xfs_buf_relse(sbp); | |
014c2544 | 1208 | return error; |
1da177e4 LT |
1209 | } |
1210 | ||
1211 | /* | |
1212 | * xfs_mod_sb() can be used to copy arbitrary changes to the | |
1213 | * in-core superblock into the superblock buffer to be logged. | |
1214 | * It does not provide the higher level of locking that is | |
1215 | * needed to protect the in-core superblock from concurrent | |
1216 | * access. | |
1217 | */ | |
1218 | void | |
1219 | xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) | |
1220 | { | |
1221 | xfs_buf_t *bp; | |
1222 | int first; | |
1223 | int last; | |
1224 | xfs_mount_t *mp; | |
1225 | xfs_sb_t *sbp; | |
1226 | xfs_sb_field_t f; | |
1227 | ||
1228 | ASSERT(fields); | |
1229 | if (!fields) | |
1230 | return; | |
1231 | mp = tp->t_mountp; | |
1232 | bp = xfs_trans_getsb(tp, mp, 0); | |
1233 | sbp = XFS_BUF_TO_SBP(bp); | |
1234 | first = sizeof(xfs_sb_t); | |
1235 | last = 0; | |
1236 | ||
1237 | /* translate/copy */ | |
1238 | ||
1239 | xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields); | |
1240 | ||
1241 | /* find modified range */ | |
1242 | ||
1243 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
1244 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1245 | first = xfs_sb_info[f].offset; | |
1246 | ||
1247 | f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); | |
1248 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1249 | last = xfs_sb_info[f + 1].offset - 1; | |
1250 | ||
1251 | xfs_trans_log_buf(tp, bp, first, last); | |
1252 | } | |
d210a28c | 1253 | |
d210a28c | 1254 | |
1da177e4 LT |
1255 | /* |
1256 | * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply | |
1257 | * a delta to a specified field in the in-core superblock. Simply | |
1258 | * switch on the field indicated and apply the delta to that field. | |
1259 | * Fields are not allowed to dip below zero, so if the delta would | |
1260 | * do this do not apply it and return EINVAL. | |
1261 | * | |
1262 | * The SB_LOCK must be held when this routine is called. | |
1263 | */ | |
8d280b98 | 1264 | int |
20f4ebf2 DC |
1265 | xfs_mod_incore_sb_unlocked( |
1266 | xfs_mount_t *mp, | |
1267 | xfs_sb_field_t field, | |
1268 | int64_t delta, | |
1269 | int rsvd) | |
1da177e4 LT |
1270 | { |
1271 | int scounter; /* short counter for 32 bit fields */ | |
1272 | long long lcounter; /* long counter for 64 bit fields */ | |
1273 | long long res_used, rem; | |
1274 | ||
1275 | /* | |
1276 | * With the in-core superblock spin lock held, switch | |
1277 | * on the indicated field. Apply the delta to the | |
1278 | * proper field. If the fields value would dip below | |
1279 | * 0, then do not apply the delta and return EINVAL. | |
1280 | */ | |
1281 | switch (field) { | |
1282 | case XFS_SBS_ICOUNT: | |
1283 | lcounter = (long long)mp->m_sb.sb_icount; | |
1284 | lcounter += delta; | |
1285 | if (lcounter < 0) { | |
1286 | ASSERT(0); | |
014c2544 | 1287 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1288 | } |
1289 | mp->m_sb.sb_icount = lcounter; | |
014c2544 | 1290 | return 0; |
1da177e4 LT |
1291 | case XFS_SBS_IFREE: |
1292 | lcounter = (long long)mp->m_sb.sb_ifree; | |
1293 | lcounter += delta; | |
1294 | if (lcounter < 0) { | |
1295 | ASSERT(0); | |
014c2544 | 1296 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1297 | } |
1298 | mp->m_sb.sb_ifree = lcounter; | |
014c2544 | 1299 | return 0; |
1da177e4 | 1300 | case XFS_SBS_FDBLOCKS: |
4be536de DC |
1301 | lcounter = (long long) |
1302 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); | |
1da177e4 LT |
1303 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
1304 | ||
1305 | if (delta > 0) { /* Putting blocks back */ | |
1306 | if (res_used > delta) { | |
1307 | mp->m_resblks_avail += delta; | |
1308 | } else { | |
1309 | rem = delta - res_used; | |
1310 | mp->m_resblks_avail = mp->m_resblks; | |
1311 | lcounter += rem; | |
1312 | } | |
1313 | } else { /* Taking blocks away */ | |
1314 | ||
1315 | lcounter += delta; | |
1316 | ||
1317 | /* | |
1318 | * If were out of blocks, use any available reserved blocks if | |
1319 | * were allowed to. | |
1320 | */ | |
1321 | ||
1322 | if (lcounter < 0) { | |
1323 | if (rsvd) { | |
1324 | lcounter = (long long)mp->m_resblks_avail + delta; | |
1325 | if (lcounter < 0) { | |
014c2544 | 1326 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1327 | } |
1328 | mp->m_resblks_avail = lcounter; | |
014c2544 | 1329 | return 0; |
1da177e4 | 1330 | } else { /* not reserved */ |
014c2544 | 1331 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1332 | } |
1333 | } | |
1334 | } | |
1335 | ||
4be536de | 1336 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
014c2544 | 1337 | return 0; |
1da177e4 LT |
1338 | case XFS_SBS_FREXTENTS: |
1339 | lcounter = (long long)mp->m_sb.sb_frextents; | |
1340 | lcounter += delta; | |
1341 | if (lcounter < 0) { | |
014c2544 | 1342 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1343 | } |
1344 | mp->m_sb.sb_frextents = lcounter; | |
014c2544 | 1345 | return 0; |
1da177e4 LT |
1346 | case XFS_SBS_DBLOCKS: |
1347 | lcounter = (long long)mp->m_sb.sb_dblocks; | |
1348 | lcounter += delta; | |
1349 | if (lcounter < 0) { | |
1350 | ASSERT(0); | |
014c2544 | 1351 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1352 | } |
1353 | mp->m_sb.sb_dblocks = lcounter; | |
014c2544 | 1354 | return 0; |
1da177e4 LT |
1355 | case XFS_SBS_AGCOUNT: |
1356 | scounter = mp->m_sb.sb_agcount; | |
1357 | scounter += delta; | |
1358 | if (scounter < 0) { | |
1359 | ASSERT(0); | |
014c2544 | 1360 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1361 | } |
1362 | mp->m_sb.sb_agcount = scounter; | |
014c2544 | 1363 | return 0; |
1da177e4 LT |
1364 | case XFS_SBS_IMAX_PCT: |
1365 | scounter = mp->m_sb.sb_imax_pct; | |
1366 | scounter += delta; | |
1367 | if (scounter < 0) { | |
1368 | ASSERT(0); | |
014c2544 | 1369 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1370 | } |
1371 | mp->m_sb.sb_imax_pct = scounter; | |
014c2544 | 1372 | return 0; |
1da177e4 LT |
1373 | case XFS_SBS_REXTSIZE: |
1374 | scounter = mp->m_sb.sb_rextsize; | |
1375 | scounter += delta; | |
1376 | if (scounter < 0) { | |
1377 | ASSERT(0); | |
014c2544 | 1378 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1379 | } |
1380 | mp->m_sb.sb_rextsize = scounter; | |
014c2544 | 1381 | return 0; |
1da177e4 LT |
1382 | case XFS_SBS_RBMBLOCKS: |
1383 | scounter = mp->m_sb.sb_rbmblocks; | |
1384 | scounter += delta; | |
1385 | if (scounter < 0) { | |
1386 | ASSERT(0); | |
014c2544 | 1387 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1388 | } |
1389 | mp->m_sb.sb_rbmblocks = scounter; | |
014c2544 | 1390 | return 0; |
1da177e4 LT |
1391 | case XFS_SBS_RBLOCKS: |
1392 | lcounter = (long long)mp->m_sb.sb_rblocks; | |
1393 | lcounter += delta; | |
1394 | if (lcounter < 0) { | |
1395 | ASSERT(0); | |
014c2544 | 1396 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1397 | } |
1398 | mp->m_sb.sb_rblocks = lcounter; | |
014c2544 | 1399 | return 0; |
1da177e4 LT |
1400 | case XFS_SBS_REXTENTS: |
1401 | lcounter = (long long)mp->m_sb.sb_rextents; | |
1402 | lcounter += delta; | |
1403 | if (lcounter < 0) { | |
1404 | ASSERT(0); | |
014c2544 | 1405 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1406 | } |
1407 | mp->m_sb.sb_rextents = lcounter; | |
014c2544 | 1408 | return 0; |
1da177e4 LT |
1409 | case XFS_SBS_REXTSLOG: |
1410 | scounter = mp->m_sb.sb_rextslog; | |
1411 | scounter += delta; | |
1412 | if (scounter < 0) { | |
1413 | ASSERT(0); | |
014c2544 | 1414 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1415 | } |
1416 | mp->m_sb.sb_rextslog = scounter; | |
014c2544 | 1417 | return 0; |
1da177e4 LT |
1418 | default: |
1419 | ASSERT(0); | |
014c2544 | 1420 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1421 | } |
1422 | } | |
1423 | ||
1424 | /* | |
1425 | * xfs_mod_incore_sb() is used to change a field in the in-core | |
1426 | * superblock structure by the specified delta. This modification | |
1427 | * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked() | |
1428 | * routine to do the work. | |
1429 | */ | |
1430 | int | |
20f4ebf2 DC |
1431 | xfs_mod_incore_sb( |
1432 | xfs_mount_t *mp, | |
1433 | xfs_sb_field_t field, | |
1434 | int64_t delta, | |
1435 | int rsvd) | |
1da177e4 LT |
1436 | { |
1437 | unsigned long s; | |
1438 | int status; | |
1439 | ||
8d280b98 DC |
1440 | /* check for per-cpu counters */ |
1441 | switch (field) { | |
1442 | #ifdef HAVE_PERCPU_SB | |
1443 | case XFS_SBS_ICOUNT: | |
1444 | case XFS_SBS_IFREE: | |
1445 | case XFS_SBS_FDBLOCKS: | |
1446 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
1447 | status = xfs_icsb_modify_counters(mp, field, | |
1448 | delta, rsvd); | |
1449 | break; | |
1450 | } | |
1451 | /* FALLTHROUGH */ | |
1452 | #endif | |
1453 | default: | |
1454 | s = XFS_SB_LOCK(mp); | |
1455 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); | |
1456 | XFS_SB_UNLOCK(mp, s); | |
1457 | break; | |
1458 | } | |
1459 | ||
014c2544 | 1460 | return status; |
1da177e4 LT |
1461 | } |
1462 | ||
1463 | /* | |
1464 | * xfs_mod_incore_sb_batch() is used to change more than one field | |
1465 | * in the in-core superblock structure at a time. This modification | |
1466 | * is protected by a lock internal to this module. The fields and | |
1467 | * changes to those fields are specified in the array of xfs_mod_sb | |
1468 | * structures passed in. | |
1469 | * | |
1470 | * Either all of the specified deltas will be applied or none of | |
1471 | * them will. If any modified field dips below 0, then all modifications | |
1472 | * will be backed out and EINVAL will be returned. | |
1473 | */ | |
1474 | int | |
1475 | xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd) | |
1476 | { | |
1477 | unsigned long s; | |
1478 | int status=0; | |
1479 | xfs_mod_sb_t *msbp; | |
1480 | ||
1481 | /* | |
1482 | * Loop through the array of mod structures and apply each | |
1483 | * individually. If any fail, then back out all those | |
1484 | * which have already been applied. Do all of this within | |
1485 | * the scope of the SB_LOCK so that all of the changes will | |
1486 | * be atomic. | |
1487 | */ | |
1488 | s = XFS_SB_LOCK(mp); | |
1489 | msbp = &msb[0]; | |
1490 | for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) { | |
1491 | /* | |
1492 | * Apply the delta at index n. If it fails, break | |
1493 | * from the loop so we'll fall into the undo loop | |
1494 | * below. | |
1495 | */ | |
8d280b98 DC |
1496 | switch (msbp->msb_field) { |
1497 | #ifdef HAVE_PERCPU_SB | |
1498 | case XFS_SBS_ICOUNT: | |
1499 | case XFS_SBS_IFREE: | |
1500 | case XFS_SBS_FDBLOCKS: | |
1501 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
20b64285 DC |
1502 | XFS_SB_UNLOCK(mp, s); |
1503 | status = xfs_icsb_modify_counters(mp, | |
8d280b98 DC |
1504 | msbp->msb_field, |
1505 | msbp->msb_delta, rsvd); | |
20b64285 | 1506 | s = XFS_SB_LOCK(mp); |
8d280b98 DC |
1507 | break; |
1508 | } | |
1509 | /* FALLTHROUGH */ | |
1510 | #endif | |
1511 | default: | |
1512 | status = xfs_mod_incore_sb_unlocked(mp, | |
1513 | msbp->msb_field, | |
1514 | msbp->msb_delta, rsvd); | |
1515 | break; | |
1516 | } | |
1517 | ||
1da177e4 LT |
1518 | if (status != 0) { |
1519 | break; | |
1520 | } | |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * If we didn't complete the loop above, then back out | |
1525 | * any changes made to the superblock. If you add code | |
1526 | * between the loop above and here, make sure that you | |
1527 | * preserve the value of status. Loop back until | |
1528 | * we step below the beginning of the array. Make sure | |
1529 | * we don't touch anything back there. | |
1530 | */ | |
1531 | if (status != 0) { | |
1532 | msbp--; | |
1533 | while (msbp >= msb) { | |
8d280b98 DC |
1534 | switch (msbp->msb_field) { |
1535 | #ifdef HAVE_PERCPU_SB | |
1536 | case XFS_SBS_ICOUNT: | |
1537 | case XFS_SBS_IFREE: | |
1538 | case XFS_SBS_FDBLOCKS: | |
1539 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
20b64285 DC |
1540 | XFS_SB_UNLOCK(mp, s); |
1541 | status = xfs_icsb_modify_counters(mp, | |
8d280b98 DC |
1542 | msbp->msb_field, |
1543 | -(msbp->msb_delta), | |
1544 | rsvd); | |
20b64285 | 1545 | s = XFS_SB_LOCK(mp); |
8d280b98 DC |
1546 | break; |
1547 | } | |
1548 | /* FALLTHROUGH */ | |
1549 | #endif | |
1550 | default: | |
1551 | status = xfs_mod_incore_sb_unlocked(mp, | |
1552 | msbp->msb_field, | |
1553 | -(msbp->msb_delta), | |
1554 | rsvd); | |
1555 | break; | |
1556 | } | |
1da177e4 LT |
1557 | ASSERT(status == 0); |
1558 | msbp--; | |
1559 | } | |
1560 | } | |
1561 | XFS_SB_UNLOCK(mp, s); | |
014c2544 | 1562 | return status; |
1da177e4 LT |
1563 | } |
1564 | ||
1565 | /* | |
1566 | * xfs_getsb() is called to obtain the buffer for the superblock. | |
1567 | * The buffer is returned locked and read in from disk. | |
1568 | * The buffer should be released with a call to xfs_brelse(). | |
1569 | * | |
1570 | * If the flags parameter is BUF_TRYLOCK, then we'll only return | |
1571 | * the superblock buffer if it can be locked without sleeping. | |
1572 | * If it can't then we'll return NULL. | |
1573 | */ | |
1574 | xfs_buf_t * | |
1575 | xfs_getsb( | |
1576 | xfs_mount_t *mp, | |
1577 | int flags) | |
1578 | { | |
1579 | xfs_buf_t *bp; | |
1580 | ||
1581 | ASSERT(mp->m_sb_bp != NULL); | |
1582 | bp = mp->m_sb_bp; | |
1583 | if (flags & XFS_BUF_TRYLOCK) { | |
1584 | if (!XFS_BUF_CPSEMA(bp)) { | |
1585 | return NULL; | |
1586 | } | |
1587 | } else { | |
1588 | XFS_BUF_PSEMA(bp, PRIBIO); | |
1589 | } | |
1590 | XFS_BUF_HOLD(bp); | |
1591 | ASSERT(XFS_BUF_ISDONE(bp)); | |
014c2544 | 1592 | return bp; |
1da177e4 LT |
1593 | } |
1594 | ||
1595 | /* | |
1596 | * Used to free the superblock along various error paths. | |
1597 | */ | |
1598 | void | |
1599 | xfs_freesb( | |
1600 | xfs_mount_t *mp) | |
1601 | { | |
1602 | xfs_buf_t *bp; | |
1603 | ||
1604 | /* | |
1605 | * Use xfs_getsb() so that the buffer will be locked | |
1606 | * when we call xfs_buf_relse(). | |
1607 | */ | |
1608 | bp = xfs_getsb(mp, 0); | |
1609 | XFS_BUF_UNMANAGE(bp); | |
1610 | xfs_buf_relse(bp); | |
1611 | mp->m_sb_bp = NULL; | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * See if the UUID is unique among mounted XFS filesystems. | |
1616 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. | |
1617 | */ | |
1618 | STATIC int | |
1619 | xfs_uuid_mount( | |
1620 | xfs_mount_t *mp) | |
1621 | { | |
1622 | if (uuid_is_nil(&mp->m_sb.sb_uuid)) { | |
1623 | cmn_err(CE_WARN, | |
1624 | "XFS: Filesystem %s has nil UUID - can't mount", | |
1625 | mp->m_fsname); | |
1626 | return -1; | |
1627 | } | |
1628 | if (!uuid_table_insert(&mp->m_sb.sb_uuid)) { | |
1629 | cmn_err(CE_WARN, | |
1630 | "XFS: Filesystem %s has duplicate UUID - can't mount", | |
1631 | mp->m_fsname); | |
1632 | return -1; | |
1633 | } | |
1634 | return 0; | |
1635 | } | |
1636 | ||
1637 | /* | |
1638 | * Remove filesystem from the UUID table. | |
1639 | */ | |
1640 | STATIC void | |
1641 | xfs_uuid_unmount( | |
1642 | xfs_mount_t *mp) | |
1643 | { | |
1644 | uuid_table_remove(&mp->m_sb.sb_uuid); | |
1645 | } | |
1646 | ||
1647 | /* | |
1648 | * Used to log changes to the superblock unit and width fields which could | |
1649 | * be altered by the mount options. Only the first superblock is updated. | |
1650 | */ | |
1651 | STATIC void | |
1652 | xfs_mount_log_sbunit( | |
1653 | xfs_mount_t *mp, | |
1654 | __int64_t fields) | |
1655 | { | |
1656 | xfs_trans_t *tp; | |
1657 | ||
1658 | ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID)); | |
1659 | ||
1660 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); | |
1661 | if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1662 | XFS_DEFAULT_LOG_COUNT)) { | |
1663 | xfs_trans_cancel(tp, 0); | |
1664 | return; | |
1665 | } | |
1666 | xfs_mod_sb(tp, fields); | |
1c72bf90 | 1667 | xfs_trans_commit(tp, 0); |
1da177e4 | 1668 | } |
8d280b98 DC |
1669 | |
1670 | ||
1671 | #ifdef HAVE_PERCPU_SB | |
1672 | /* | |
1673 | * Per-cpu incore superblock counters | |
1674 | * | |
1675 | * Simple concept, difficult implementation | |
1676 | * | |
1677 | * Basically, replace the incore superblock counters with a distributed per cpu | |
1678 | * counter for contended fields (e.g. free block count). | |
1679 | * | |
1680 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and | |
1681 | * hence needs to be accurately read when we are running low on space. Hence | |
1682 | * there is a method to enable and disable the per-cpu counters based on how | |
1683 | * much "stuff" is available in them. | |
1684 | * | |
1685 | * Basically, a counter is enabled if there is enough free resource to justify | |
1686 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local | |
1687 | * ENOSPC), then we disable the counters to synchronise all callers and | |
1688 | * re-distribute the available resources. | |
1689 | * | |
1690 | * If, once we redistributed the available resources, we still get a failure, | |
1691 | * we disable the per-cpu counter and go through the slow path. | |
1692 | * | |
1693 | * The slow path is the current xfs_mod_incore_sb() function. This means that | |
1694 | * when we disable a per-cpu counter, we need to drain it's resources back to | |
1695 | * the global superblock. We do this after disabling the counter to prevent | |
1696 | * more threads from queueing up on the counter. | |
1697 | * | |
1698 | * Essentially, this means that we still need a lock in the fast path to enable | |
1699 | * synchronisation between the global counters and the per-cpu counters. This | |
1700 | * is not a problem because the lock will be local to a CPU almost all the time | |
1701 | * and have little contention except when we get to ENOSPC conditions. | |
1702 | * | |
1703 | * Basically, this lock becomes a barrier that enables us to lock out the fast | |
1704 | * path while we do things like enabling and disabling counters and | |
1705 | * synchronising the counters. | |
1706 | * | |
1707 | * Locking rules: | |
1708 | * | |
1709 | * 1. XFS_SB_LOCK() before picking up per-cpu locks | |
1710 | * 2. per-cpu locks always picked up via for_each_online_cpu() order | |
1711 | * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks | |
1712 | * 4. modifying per-cpu counters requires holding per-cpu lock | |
1713 | * 5. modifying global counters requires holding XFS_SB_LOCK | |
1714 | * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK | |
1715 | * and _none_ of the per-cpu locks. | |
1716 | * | |
1717 | * Disabled counters are only ever re-enabled by a balance operation | |
1718 | * that results in more free resources per CPU than a given threshold. | |
1719 | * To ensure counters don't remain disabled, they are rebalanced when | |
1720 | * the global resource goes above a higher threshold (i.e. some hysteresis | |
1721 | * is present to prevent thrashing). | |
e8234a68 DC |
1722 | */ |
1723 | ||
5a67e4c5 | 1724 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1725 | /* |
1726 | * hot-plug CPU notifier support. | |
8d280b98 | 1727 | * |
5a67e4c5 CS |
1728 | * We need a notifier per filesystem as we need to be able to identify |
1729 | * the filesystem to balance the counters out. This is achieved by | |
1730 | * having a notifier block embedded in the xfs_mount_t and doing pointer | |
1731 | * magic to get the mount pointer from the notifier block address. | |
8d280b98 | 1732 | */ |
e8234a68 DC |
1733 | STATIC int |
1734 | xfs_icsb_cpu_notify( | |
1735 | struct notifier_block *nfb, | |
1736 | unsigned long action, | |
1737 | void *hcpu) | |
1738 | { | |
1739 | xfs_icsb_cnts_t *cntp; | |
1740 | xfs_mount_t *mp; | |
1741 | int s; | |
1742 | ||
1743 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); | |
1744 | cntp = (xfs_icsb_cnts_t *) | |
1745 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); | |
1746 | switch (action) { | |
1747 | case CPU_UP_PREPARE: | |
8bb78442 | 1748 | case CPU_UP_PREPARE_FROZEN: |
e8234a68 DC |
1749 | /* Easy Case - initialize the area and locks, and |
1750 | * then rebalance when online does everything else for us. */ | |
01e1b69c | 1751 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 DC |
1752 | break; |
1753 | case CPU_ONLINE: | |
8bb78442 | 1754 | case CPU_ONLINE_FROZEN: |
03135cf7 | 1755 | xfs_icsb_lock(mp); |
20b64285 DC |
1756 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); |
1757 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
1758 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
03135cf7 | 1759 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1760 | break; |
1761 | case CPU_DEAD: | |
8bb78442 | 1762 | case CPU_DEAD_FROZEN: |
e8234a68 DC |
1763 | /* Disable all the counters, then fold the dead cpu's |
1764 | * count into the total on the global superblock and | |
1765 | * re-enable the counters. */ | |
03135cf7 | 1766 | xfs_icsb_lock(mp); |
e8234a68 DC |
1767 | s = XFS_SB_LOCK(mp); |
1768 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); | |
1769 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); | |
1770 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); | |
1771 | ||
1772 | mp->m_sb.sb_icount += cntp->icsb_icount; | |
1773 | mp->m_sb.sb_ifree += cntp->icsb_ifree; | |
1774 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; | |
1775 | ||
01e1b69c | 1776 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 | 1777 | |
20b64285 DC |
1778 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, |
1779 | XFS_ICSB_SB_LOCKED, 0); | |
1780 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, | |
1781 | XFS_ICSB_SB_LOCKED, 0); | |
1782 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, | |
1783 | XFS_ICSB_SB_LOCKED, 0); | |
e8234a68 | 1784 | XFS_SB_UNLOCK(mp, s); |
03135cf7 | 1785 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1786 | break; |
1787 | } | |
1788 | ||
1789 | return NOTIFY_OK; | |
1790 | } | |
5a67e4c5 | 1791 | #endif /* CONFIG_HOTPLUG_CPU */ |
e8234a68 | 1792 | |
8d280b98 DC |
1793 | int |
1794 | xfs_icsb_init_counters( | |
1795 | xfs_mount_t *mp) | |
1796 | { | |
1797 | xfs_icsb_cnts_t *cntp; | |
1798 | int i; | |
1799 | ||
1800 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); | |
1801 | if (mp->m_sb_cnts == NULL) | |
1802 | return -ENOMEM; | |
1803 | ||
5a67e4c5 | 1804 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1805 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; |
1806 | mp->m_icsb_notifier.priority = 0; | |
5a67e4c5 CS |
1807 | register_hotcpu_notifier(&mp->m_icsb_notifier); |
1808 | #endif /* CONFIG_HOTPLUG_CPU */ | |
e8234a68 | 1809 | |
8d280b98 DC |
1810 | for_each_online_cpu(i) { |
1811 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1812 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
8d280b98 | 1813 | } |
20b64285 DC |
1814 | |
1815 | mutex_init(&mp->m_icsb_mutex); | |
1816 | ||
8d280b98 DC |
1817 | /* |
1818 | * start with all counters disabled so that the | |
1819 | * initial balance kicks us off correctly | |
1820 | */ | |
1821 | mp->m_icsb_counters = -1; | |
1822 | return 0; | |
1823 | } | |
1824 | ||
5478eead LM |
1825 | void |
1826 | xfs_icsb_reinit_counters( | |
1827 | xfs_mount_t *mp) | |
1828 | { | |
1829 | xfs_icsb_lock(mp); | |
1830 | /* | |
1831 | * start with all counters disabled so that the | |
1832 | * initial balance kicks us off correctly | |
1833 | */ | |
1834 | mp->m_icsb_counters = -1; | |
1835 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); | |
1836 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
1837 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
1838 | xfs_icsb_unlock(mp); | |
1839 | } | |
1840 | ||
8d280b98 DC |
1841 | STATIC void |
1842 | xfs_icsb_destroy_counters( | |
1843 | xfs_mount_t *mp) | |
1844 | { | |
e8234a68 | 1845 | if (mp->m_sb_cnts) { |
5a67e4c5 | 1846 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
8d280b98 | 1847 | free_percpu(mp->m_sb_cnts); |
e8234a68 | 1848 | } |
03135cf7 | 1849 | mutex_destroy(&mp->m_icsb_mutex); |
8d280b98 DC |
1850 | } |
1851 | ||
7989cb8e | 1852 | STATIC_INLINE void |
01e1b69c DC |
1853 | xfs_icsb_lock_cntr( |
1854 | xfs_icsb_cnts_t *icsbp) | |
1855 | { | |
1856 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { | |
1857 | ndelay(1000); | |
1858 | } | |
1859 | } | |
1860 | ||
7989cb8e | 1861 | STATIC_INLINE void |
01e1b69c DC |
1862 | xfs_icsb_unlock_cntr( |
1863 | xfs_icsb_cnts_t *icsbp) | |
1864 | { | |
1865 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); | |
1866 | } | |
1867 | ||
8d280b98 | 1868 | |
7989cb8e | 1869 | STATIC_INLINE void |
8d280b98 DC |
1870 | xfs_icsb_lock_all_counters( |
1871 | xfs_mount_t *mp) | |
1872 | { | |
1873 | xfs_icsb_cnts_t *cntp; | |
1874 | int i; | |
1875 | ||
1876 | for_each_online_cpu(i) { | |
1877 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1878 | xfs_icsb_lock_cntr(cntp); |
8d280b98 DC |
1879 | } |
1880 | } | |
1881 | ||
7989cb8e | 1882 | STATIC_INLINE void |
8d280b98 DC |
1883 | xfs_icsb_unlock_all_counters( |
1884 | xfs_mount_t *mp) | |
1885 | { | |
1886 | xfs_icsb_cnts_t *cntp; | |
1887 | int i; | |
1888 | ||
1889 | for_each_online_cpu(i) { | |
1890 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1891 | xfs_icsb_unlock_cntr(cntp); |
8d280b98 DC |
1892 | } |
1893 | } | |
1894 | ||
1895 | STATIC void | |
1896 | xfs_icsb_count( | |
1897 | xfs_mount_t *mp, | |
1898 | xfs_icsb_cnts_t *cnt, | |
1899 | int flags) | |
1900 | { | |
1901 | xfs_icsb_cnts_t *cntp; | |
1902 | int i; | |
1903 | ||
1904 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); | |
1905 | ||
1906 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
1907 | xfs_icsb_lock_all_counters(mp); | |
1908 | ||
1909 | for_each_online_cpu(i) { | |
1910 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
1911 | cnt->icsb_icount += cntp->icsb_icount; | |
1912 | cnt->icsb_ifree += cntp->icsb_ifree; | |
1913 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; | |
1914 | } | |
1915 | ||
1916 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
1917 | xfs_icsb_unlock_all_counters(mp); | |
1918 | } | |
1919 | ||
1920 | STATIC int | |
1921 | xfs_icsb_counter_disabled( | |
1922 | xfs_mount_t *mp, | |
1923 | xfs_sb_field_t field) | |
1924 | { | |
1925 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
1926 | return test_bit(field, &mp->m_icsb_counters); | |
1927 | } | |
1928 | ||
1929 | STATIC int | |
1930 | xfs_icsb_disable_counter( | |
1931 | xfs_mount_t *mp, | |
1932 | xfs_sb_field_t field) | |
1933 | { | |
1934 | xfs_icsb_cnts_t cnt; | |
1935 | ||
1936 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
1937 | ||
20b64285 DC |
1938 | /* |
1939 | * If we are already disabled, then there is nothing to do | |
1940 | * here. We check before locking all the counters to avoid | |
1941 | * the expensive lock operation when being called in the | |
1942 | * slow path and the counter is already disabled. This is | |
1943 | * safe because the only time we set or clear this state is under | |
1944 | * the m_icsb_mutex. | |
1945 | */ | |
1946 | if (xfs_icsb_counter_disabled(mp, field)) | |
1947 | return 0; | |
1948 | ||
8d280b98 DC |
1949 | xfs_icsb_lock_all_counters(mp); |
1950 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { | |
1951 | /* drain back to superblock */ | |
1952 | ||
1953 | xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT); | |
1954 | switch(field) { | |
1955 | case XFS_SBS_ICOUNT: | |
1956 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
1957 | break; | |
1958 | case XFS_SBS_IFREE: | |
1959 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
1960 | break; | |
1961 | case XFS_SBS_FDBLOCKS: | |
1962 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
1963 | break; | |
1964 | default: | |
1965 | BUG(); | |
1966 | } | |
1967 | } | |
1968 | ||
1969 | xfs_icsb_unlock_all_counters(mp); | |
1970 | ||
1971 | return 0; | |
1972 | } | |
1973 | ||
1974 | STATIC void | |
1975 | xfs_icsb_enable_counter( | |
1976 | xfs_mount_t *mp, | |
1977 | xfs_sb_field_t field, | |
1978 | uint64_t count, | |
1979 | uint64_t resid) | |
1980 | { | |
1981 | xfs_icsb_cnts_t *cntp; | |
1982 | int i; | |
1983 | ||
1984 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
1985 | ||
1986 | xfs_icsb_lock_all_counters(mp); | |
1987 | for_each_online_cpu(i) { | |
1988 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); | |
1989 | switch (field) { | |
1990 | case XFS_SBS_ICOUNT: | |
1991 | cntp->icsb_icount = count + resid; | |
1992 | break; | |
1993 | case XFS_SBS_IFREE: | |
1994 | cntp->icsb_ifree = count + resid; | |
1995 | break; | |
1996 | case XFS_SBS_FDBLOCKS: | |
1997 | cntp->icsb_fdblocks = count + resid; | |
1998 | break; | |
1999 | default: | |
2000 | BUG(); | |
2001 | break; | |
2002 | } | |
2003 | resid = 0; | |
2004 | } | |
2005 | clear_bit(field, &mp->m_icsb_counters); | |
2006 | xfs_icsb_unlock_all_counters(mp); | |
2007 | } | |
2008 | ||
dbcabad1 DC |
2009 | void |
2010 | xfs_icsb_sync_counters_flags( | |
8d280b98 DC |
2011 | xfs_mount_t *mp, |
2012 | int flags) | |
2013 | { | |
2014 | xfs_icsb_cnts_t cnt; | |
2015 | int s; | |
2016 | ||
2017 | /* Pass 1: lock all counters */ | |
2018 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
2019 | s = XFS_SB_LOCK(mp); | |
2020 | ||
2021 | xfs_icsb_count(mp, &cnt, flags); | |
2022 | ||
2023 | /* Step 3: update mp->m_sb fields */ | |
2024 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) | |
2025 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2026 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) | |
2027 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2028 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) | |
2029 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2030 | ||
2031 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
2032 | XFS_SB_UNLOCK(mp, s); | |
2033 | } | |
2034 | ||
2035 | /* | |
2036 | * Accurate update of per-cpu counters to incore superblock | |
2037 | */ | |
2038 | STATIC void | |
2039 | xfs_icsb_sync_counters( | |
2040 | xfs_mount_t *mp) | |
2041 | { | |
dbcabad1 | 2042 | xfs_icsb_sync_counters_flags(mp, 0); |
8d280b98 DC |
2043 | } |
2044 | ||
2045 | /* | |
2046 | * Balance and enable/disable counters as necessary. | |
2047 | * | |
20b64285 DC |
2048 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
2049 | * chosen to be the same number as single on disk allocation chunk per CPU, and | |
2050 | * free blocks is something far enough zero that we aren't going thrash when we | |
2051 | * get near ENOSPC. We also need to supply a minimum we require per cpu to | |
2052 | * prevent looping endlessly when xfs_alloc_space asks for more than will | |
2053 | * be distributed to a single CPU but each CPU has enough blocks to be | |
2054 | * reenabled. | |
2055 | * | |
2056 | * Note that we can be called when counters are already disabled. | |
2057 | * xfs_icsb_disable_counter() optimises the counter locking in this case to | |
2058 | * prevent locking every per-cpu counter needlessly. | |
8d280b98 | 2059 | */ |
20b64285 DC |
2060 | |
2061 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 | |
4be536de | 2062 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
20b64285 | 2063 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
8d280b98 DC |
2064 | STATIC void |
2065 | xfs_icsb_balance_counter( | |
2066 | xfs_mount_t *mp, | |
2067 | xfs_sb_field_t field, | |
20b64285 DC |
2068 | int flags, |
2069 | int min_per_cpu) | |
8d280b98 | 2070 | { |
6fdf8ccc | 2071 | uint64_t count, resid; |
8d280b98 DC |
2072 | int weight = num_online_cpus(); |
2073 | int s; | |
20b64285 | 2074 | uint64_t min = (uint64_t)min_per_cpu; |
8d280b98 DC |
2075 | |
2076 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
2077 | s = XFS_SB_LOCK(mp); | |
2078 | ||
2079 | /* disable counter and sync counter */ | |
2080 | xfs_icsb_disable_counter(mp, field); | |
2081 | ||
2082 | /* update counters - first CPU gets residual*/ | |
2083 | switch (field) { | |
2084 | case XFS_SBS_ICOUNT: | |
2085 | count = mp->m_sb.sb_icount; | |
2086 | resid = do_div(count, weight); | |
20b64285 | 2087 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2088 | goto out; |
2089 | break; | |
2090 | case XFS_SBS_IFREE: | |
2091 | count = mp->m_sb.sb_ifree; | |
2092 | resid = do_div(count, weight); | |
20b64285 | 2093 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2094 | goto out; |
2095 | break; | |
2096 | case XFS_SBS_FDBLOCKS: | |
2097 | count = mp->m_sb.sb_fdblocks; | |
2098 | resid = do_div(count, weight); | |
20b64285 | 2099 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
8d280b98 DC |
2100 | goto out; |
2101 | break; | |
2102 | default: | |
2103 | BUG(); | |
6fdf8ccc | 2104 | count = resid = 0; /* quiet, gcc */ |
8d280b98 DC |
2105 | break; |
2106 | } | |
2107 | ||
2108 | xfs_icsb_enable_counter(mp, field, count, resid); | |
2109 | out: | |
2110 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
2111 | XFS_SB_UNLOCK(mp, s); | |
2112 | } | |
2113 | ||
20b64285 DC |
2114 | int |
2115 | xfs_icsb_modify_counters( | |
8d280b98 DC |
2116 | xfs_mount_t *mp, |
2117 | xfs_sb_field_t field, | |
20f4ebf2 | 2118 | int64_t delta, |
20b64285 | 2119 | int rsvd) |
8d280b98 DC |
2120 | { |
2121 | xfs_icsb_cnts_t *icsbp; | |
2122 | long long lcounter; /* long counter for 64 bit fields */ | |
20b64285 | 2123 | int cpu, ret = 0, s; |
8d280b98 | 2124 | |
20b64285 | 2125 | might_sleep(); |
8d280b98 DC |
2126 | again: |
2127 | cpu = get_cpu(); | |
20b64285 DC |
2128 | icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu); |
2129 | ||
2130 | /* | |
2131 | * if the counter is disabled, go to slow path | |
2132 | */ | |
8d280b98 DC |
2133 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
2134 | goto slow_path; | |
20b64285 DC |
2135 | xfs_icsb_lock_cntr(icsbp); |
2136 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { | |
2137 | xfs_icsb_unlock_cntr(icsbp); | |
2138 | goto slow_path; | |
2139 | } | |
8d280b98 DC |
2140 | |
2141 | switch (field) { | |
2142 | case XFS_SBS_ICOUNT: | |
2143 | lcounter = icsbp->icsb_icount; | |
2144 | lcounter += delta; | |
2145 | if (unlikely(lcounter < 0)) | |
20b64285 | 2146 | goto balance_counter; |
8d280b98 DC |
2147 | icsbp->icsb_icount = lcounter; |
2148 | break; | |
2149 | ||
2150 | case XFS_SBS_IFREE: | |
2151 | lcounter = icsbp->icsb_ifree; | |
2152 | lcounter += delta; | |
2153 | if (unlikely(lcounter < 0)) | |
20b64285 | 2154 | goto balance_counter; |
8d280b98 DC |
2155 | icsbp->icsb_ifree = lcounter; |
2156 | break; | |
2157 | ||
2158 | case XFS_SBS_FDBLOCKS: | |
2159 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); | |
2160 | ||
4be536de | 2161 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2162 | lcounter += delta; |
2163 | if (unlikely(lcounter < 0)) | |
20b64285 | 2164 | goto balance_counter; |
4be536de | 2165 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2166 | break; |
2167 | default: | |
2168 | BUG(); | |
2169 | break; | |
2170 | } | |
01e1b69c | 2171 | xfs_icsb_unlock_cntr(icsbp); |
8d280b98 | 2172 | put_cpu(); |
8d280b98 DC |
2173 | return 0; |
2174 | ||
8d280b98 | 2175 | slow_path: |
8d280b98 DC |
2176 | put_cpu(); |
2177 | ||
20b64285 DC |
2178 | /* |
2179 | * serialise with a mutex so we don't burn lots of cpu on | |
2180 | * the superblock lock. We still need to hold the superblock | |
2181 | * lock, however, when we modify the global structures. | |
2182 | */ | |
03135cf7 | 2183 | xfs_icsb_lock(mp); |
20b64285 DC |
2184 | |
2185 | /* | |
2186 | * Now running atomically. | |
2187 | * | |
2188 | * If the counter is enabled, someone has beaten us to rebalancing. | |
2189 | * Drop the lock and try again in the fast path.... | |
2190 | */ | |
2191 | if (!(xfs_icsb_counter_disabled(mp, field))) { | |
03135cf7 | 2192 | xfs_icsb_unlock(mp); |
8d280b98 | 2193 | goto again; |
8d280b98 DC |
2194 | } |
2195 | ||
20b64285 DC |
2196 | /* |
2197 | * The counter is currently disabled. Because we are | |
2198 | * running atomically here, we know a rebalance cannot | |
2199 | * be in progress. Hence we can go straight to operating | |
2200 | * on the global superblock. We do not call xfs_mod_incore_sb() | |
2201 | * here even though we need to get the SB_LOCK. Doing so | |
2202 | * will cause us to re-enter this function and deadlock. | |
2203 | * Hence we get the SB_LOCK ourselves and then call | |
2204 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates | |
2205 | * directly on the global counters. | |
2206 | */ | |
2207 | s = XFS_SB_LOCK(mp); | |
8d280b98 | 2208 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
20b64285 | 2209 | XFS_SB_UNLOCK(mp, s); |
8d280b98 | 2210 | |
20b64285 DC |
2211 | /* |
2212 | * Now that we've modified the global superblock, we | |
2213 | * may be able to re-enable the distributed counters | |
2214 | * (e.g. lots of space just got freed). After that | |
2215 | * we are done. | |
2216 | */ | |
2217 | if (ret != ENOSPC) | |
2218 | xfs_icsb_balance_counter(mp, field, 0, 0); | |
03135cf7 | 2219 | xfs_icsb_unlock(mp); |
8d280b98 | 2220 | return ret; |
8d280b98 | 2221 | |
20b64285 DC |
2222 | balance_counter: |
2223 | xfs_icsb_unlock_cntr(icsbp); | |
2224 | put_cpu(); | |
8d280b98 | 2225 | |
20b64285 DC |
2226 | /* |
2227 | * We may have multiple threads here if multiple per-cpu | |
2228 | * counters run dry at the same time. This will mean we can | |
2229 | * do more balances than strictly necessary but it is not | |
2230 | * the common slowpath case. | |
2231 | */ | |
03135cf7 | 2232 | xfs_icsb_lock(mp); |
20b64285 DC |
2233 | |
2234 | /* | |
2235 | * running atomically. | |
2236 | * | |
2237 | * This will leave the counter in the correct state for future | |
2238 | * accesses. After the rebalance, we simply try again and our retry | |
2239 | * will either succeed through the fast path or slow path without | |
2240 | * another balance operation being required. | |
2241 | */ | |
2242 | xfs_icsb_balance_counter(mp, field, 0, delta); | |
03135cf7 | 2243 | xfs_icsb_unlock(mp); |
20b64285 | 2244 | goto again; |
8d280b98 | 2245 | } |
20b64285 | 2246 | |
8d280b98 | 2247 | #endif |