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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 | 162 | { |
1da177e4 LT |
163 | if (mp->m_perag) { |
164 | int agno; | |
165 | ||
166 | for (agno = 0; agno < mp->m_maxagi; agno++) | |
167 | if (mp->m_perag[agno].pagb_list) | |
168 | kmem_free(mp->m_perag[agno].pagb_list, | |
169 | sizeof(xfs_perag_busy_t) * | |
170 | XFS_PAGB_NUM_SLOTS); | |
171 | kmem_free(mp->m_perag, | |
172 | sizeof(xfs_perag_t) * mp->m_sb.sb_agcount); | |
173 | } | |
174 | ||
175 | AIL_LOCK_DESTROY(&mp->m_ail_lock); | |
176 | spinlock_destroy(&mp->m_sb_lock); | |
177 | mutex_destroy(&mp->m_ilock); | |
178 | freesema(&mp->m_growlock); | |
179 | if (mp->m_quotainfo) | |
180 | XFS_QM_DONE(mp); | |
181 | ||
182 | if (mp->m_fsname != NULL) | |
183 | kmem_free(mp->m_fsname, mp->m_fsname_len); | |
fc1f8c1c NS |
184 | if (mp->m_rtname != NULL) |
185 | kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1); | |
186 | if (mp->m_logname != NULL) | |
187 | kmem_free(mp->m_logname, strlen(mp->m_logname) + 1); | |
1da177e4 LT |
188 | |
189 | if (remove_bhv) { | |
b83bd138 | 190 | struct bhv_vfs *vfsp = XFS_MTOVFS(mp); |
1da177e4 LT |
191 | |
192 | bhv_remove_all_vfsops(vfsp, 0); | |
193 | VFS_REMOVEBHV(vfsp, &mp->m_bhv); | |
194 | } | |
195 | ||
8d280b98 | 196 | xfs_icsb_destroy_counters(mp); |
1da177e4 LT |
197 | } |
198 | ||
4cc929ee NS |
199 | /* |
200 | * Check size of device based on the (data/realtime) block count. | |
201 | * Note: this check is used by the growfs code as well as mount. | |
202 | */ | |
203 | int | |
204 | xfs_sb_validate_fsb_count( | |
205 | xfs_sb_t *sbp, | |
206 | __uint64_t nblocks) | |
207 | { | |
208 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); | |
209 | ASSERT(sbp->sb_blocklog >= BBSHIFT); | |
210 | ||
211 | #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ | |
212 | if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) | |
213 | return E2BIG; | |
214 | #else /* Limited by UINT_MAX of sectors */ | |
215 | if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX) | |
216 | return E2BIG; | |
217 | #endif | |
218 | return 0; | |
219 | } | |
1da177e4 LT |
220 | |
221 | /* | |
222 | * Check the validity of the SB found. | |
223 | */ | |
224 | STATIC int | |
225 | xfs_mount_validate_sb( | |
226 | xfs_mount_t *mp, | |
764d1f89 NS |
227 | xfs_sb_t *sbp, |
228 | int flags) | |
1da177e4 LT |
229 | { |
230 | /* | |
231 | * If the log device and data device have the | |
232 | * same device number, the log is internal. | |
233 | * Consequently, the sb_logstart should be non-zero. If | |
234 | * we have a zero sb_logstart in this case, we may be trying to mount | |
235 | * a volume filesystem in a non-volume manner. | |
236 | */ | |
237 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { | |
764d1f89 | 238 | xfs_fs_mount_cmn_err(flags, "bad magic number"); |
1da177e4 LT |
239 | return XFS_ERROR(EWRONGFS); |
240 | } | |
241 | ||
242 | if (!XFS_SB_GOOD_VERSION(sbp)) { | |
764d1f89 | 243 | xfs_fs_mount_cmn_err(flags, "bad version"); |
1da177e4 LT |
244 | return XFS_ERROR(EWRONGFS); |
245 | } | |
246 | ||
247 | if (unlikely( | |
248 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { | |
764d1f89 NS |
249 | xfs_fs_mount_cmn_err(flags, |
250 | "filesystem is marked as having an external log; " | |
251 | "specify logdev on the\nmount command line."); | |
252 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
253 | } |
254 | ||
255 | if (unlikely( | |
256 | sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { | |
764d1f89 NS |
257 | xfs_fs_mount_cmn_err(flags, |
258 | "filesystem is marked as having an internal log; " | |
259 | "do not specify logdev on\nthe mount command line."); | |
260 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
261 | } |
262 | ||
263 | /* | |
264 | * More sanity checking. These were stolen directly from | |
265 | * xfs_repair. | |
266 | */ | |
267 | if (unlikely( | |
268 | sbp->sb_agcount <= 0 || | |
269 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
270 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
271 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
272 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
273 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || | |
274 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
275 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
276 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
277 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || | |
278 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
9f989c94 NS |
279 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || |
280 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
281 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || | |
1da177e4 LT |
282 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || |
283 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
e50bd16f | 284 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) { |
764d1f89 | 285 | xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed"); |
1da177e4 LT |
286 | return XFS_ERROR(EFSCORRUPTED); |
287 | } | |
288 | ||
289 | /* | |
290 | * Sanity check AG count, size fields against data size field | |
291 | */ | |
292 | if (unlikely( | |
293 | sbp->sb_dblocks == 0 || | |
294 | sbp->sb_dblocks > | |
295 | (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks || | |
296 | sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) * | |
297 | sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) { | |
764d1f89 | 298 | xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed"); |
1da177e4 LT |
299 | return XFS_ERROR(EFSCORRUPTED); |
300 | } | |
301 | ||
4cc929ee NS |
302 | if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || |
303 | xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { | |
764d1f89 NS |
304 | xfs_fs_mount_cmn_err(flags, |
305 | "file system too large to be mounted on this system."); | |
1da177e4 LT |
306 | return XFS_ERROR(E2BIG); |
307 | } | |
308 | ||
309 | if (unlikely(sbp->sb_inprogress)) { | |
764d1f89 | 310 | xfs_fs_mount_cmn_err(flags, "file system busy"); |
1da177e4 LT |
311 | return XFS_ERROR(EFSCORRUPTED); |
312 | } | |
313 | ||
de20614b NS |
314 | /* |
315 | * Version 1 directory format has never worked on Linux. | |
316 | */ | |
317 | if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) { | |
764d1f89 NS |
318 | xfs_fs_mount_cmn_err(flags, |
319 | "file system using version 1 directory format"); | |
de20614b NS |
320 | return XFS_ERROR(ENOSYS); |
321 | } | |
322 | ||
1da177e4 LT |
323 | /* |
324 | * Until this is fixed only page-sized or smaller data blocks work. | |
325 | */ | |
326 | if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { | |
764d1f89 NS |
327 | xfs_fs_mount_cmn_err(flags, |
328 | "file system with blocksize %d bytes", | |
1da177e4 | 329 | sbp->sb_blocksize); |
764d1f89 NS |
330 | xfs_fs_mount_cmn_err(flags, |
331 | "only pagesize (%ld) or less will currently work.", | |
1da177e4 LT |
332 | PAGE_SIZE); |
333 | return XFS_ERROR(ENOSYS); | |
334 | } | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
da353b0d DC |
339 | STATIC void |
340 | xfs_initialize_perag_icache( | |
341 | xfs_perag_t *pag) | |
342 | { | |
343 | if (!pag->pag_ici_init) { | |
344 | rwlock_init(&pag->pag_ici_lock); | |
345 | INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); | |
346 | pag->pag_ici_init = 1; | |
347 | } | |
348 | } | |
349 | ||
1da177e4 | 350 | xfs_agnumber_t |
c11e2c36 | 351 | xfs_initialize_perag( |
b83bd138 | 352 | bhv_vfs_t *vfs, |
c11e2c36 NS |
353 | xfs_mount_t *mp, |
354 | xfs_agnumber_t agcount) | |
1da177e4 LT |
355 | { |
356 | xfs_agnumber_t index, max_metadata; | |
357 | xfs_perag_t *pag; | |
358 | xfs_agino_t agino; | |
359 | xfs_ino_t ino; | |
360 | xfs_sb_t *sbp = &mp->m_sb; | |
361 | xfs_ino_t max_inum = XFS_MAXINUMBER_32; | |
362 | ||
363 | /* Check to see if the filesystem can overflow 32 bit inodes */ | |
364 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); | |
365 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); | |
366 | ||
367 | /* Clear the mount flag if no inode can overflow 32 bits | |
368 | * on this filesystem, or if specifically requested.. | |
369 | */ | |
c11e2c36 | 370 | if ((vfs->vfs_flag & VFS_32BITINODES) && ino > max_inum) { |
1da177e4 LT |
371 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
372 | } else { | |
373 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; | |
374 | } | |
375 | ||
376 | /* If we can overflow then setup the ag headers accordingly */ | |
377 | if (mp->m_flags & XFS_MOUNT_32BITINODES) { | |
378 | /* Calculate how much should be reserved for inodes to | |
379 | * meet the max inode percentage. | |
380 | */ | |
381 | if (mp->m_maxicount) { | |
382 | __uint64_t icount; | |
383 | ||
384 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
385 | do_div(icount, 100); | |
386 | icount += sbp->sb_agblocks - 1; | |
a749ee86 | 387 | do_div(icount, sbp->sb_agblocks); |
1da177e4 LT |
388 | max_metadata = icount; |
389 | } else { | |
390 | max_metadata = agcount; | |
391 | } | |
392 | for (index = 0; index < agcount; index++) { | |
393 | ino = XFS_AGINO_TO_INO(mp, index, agino); | |
394 | if (ino > max_inum) { | |
395 | index++; | |
396 | break; | |
397 | } | |
398 | ||
c41564b5 | 399 | /* This ag is preferred for inodes */ |
1da177e4 LT |
400 | pag = &mp->m_perag[index]; |
401 | pag->pagi_inodeok = 1; | |
402 | if (index < max_metadata) | |
403 | pag->pagf_metadata = 1; | |
da353b0d | 404 | xfs_initialize_perag_icache(pag); |
1da177e4 LT |
405 | } |
406 | } else { | |
407 | /* Setup default behavior for smaller filesystems */ | |
408 | for (index = 0; index < agcount; index++) { | |
409 | pag = &mp->m_perag[index]; | |
410 | pag->pagi_inodeok = 1; | |
da353b0d | 411 | xfs_initialize_perag_icache(pag); |
1da177e4 LT |
412 | } |
413 | } | |
414 | return index; | |
415 | } | |
416 | ||
2bdf7cd0 CH |
417 | void |
418 | xfs_sb_from_disk( | |
419 | xfs_sb_t *to, | |
420 | xfs_dsb_t *from) | |
421 | { | |
422 | to->sb_magicnum = be32_to_cpu(from->sb_magicnum); | |
423 | to->sb_blocksize = be32_to_cpu(from->sb_blocksize); | |
424 | to->sb_dblocks = be64_to_cpu(from->sb_dblocks); | |
425 | to->sb_rblocks = be64_to_cpu(from->sb_rblocks); | |
426 | to->sb_rextents = be64_to_cpu(from->sb_rextents); | |
427 | memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); | |
428 | to->sb_logstart = be64_to_cpu(from->sb_logstart); | |
429 | to->sb_rootino = be64_to_cpu(from->sb_rootino); | |
430 | to->sb_rbmino = be64_to_cpu(from->sb_rbmino); | |
431 | to->sb_rsumino = be64_to_cpu(from->sb_rsumino); | |
432 | to->sb_rextsize = be32_to_cpu(from->sb_rextsize); | |
433 | to->sb_agblocks = be32_to_cpu(from->sb_agblocks); | |
434 | to->sb_agcount = be32_to_cpu(from->sb_agcount); | |
435 | to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); | |
436 | to->sb_logblocks = be32_to_cpu(from->sb_logblocks); | |
437 | to->sb_versionnum = be16_to_cpu(from->sb_versionnum); | |
438 | to->sb_sectsize = be16_to_cpu(from->sb_sectsize); | |
439 | to->sb_inodesize = be16_to_cpu(from->sb_inodesize); | |
440 | to->sb_inopblock = be16_to_cpu(from->sb_inopblock); | |
441 | memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); | |
442 | to->sb_blocklog = from->sb_blocklog; | |
443 | to->sb_sectlog = from->sb_sectlog; | |
444 | to->sb_inodelog = from->sb_inodelog; | |
445 | to->sb_inopblog = from->sb_inopblog; | |
446 | to->sb_agblklog = from->sb_agblklog; | |
447 | to->sb_rextslog = from->sb_rextslog; | |
448 | to->sb_inprogress = from->sb_inprogress; | |
449 | to->sb_imax_pct = from->sb_imax_pct; | |
450 | to->sb_icount = be64_to_cpu(from->sb_icount); | |
451 | to->sb_ifree = be64_to_cpu(from->sb_ifree); | |
452 | to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); | |
453 | to->sb_frextents = be64_to_cpu(from->sb_frextents); | |
454 | to->sb_uquotino = be64_to_cpu(from->sb_uquotino); | |
455 | to->sb_gquotino = be64_to_cpu(from->sb_gquotino); | |
456 | to->sb_qflags = be16_to_cpu(from->sb_qflags); | |
457 | to->sb_flags = from->sb_flags; | |
458 | to->sb_shared_vn = from->sb_shared_vn; | |
459 | to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); | |
460 | to->sb_unit = be32_to_cpu(from->sb_unit); | |
461 | to->sb_width = be32_to_cpu(from->sb_width); | |
462 | to->sb_dirblklog = from->sb_dirblklog; | |
463 | to->sb_logsectlog = from->sb_logsectlog; | |
464 | to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); | |
465 | to->sb_logsunit = be32_to_cpu(from->sb_logsunit); | |
466 | to->sb_features2 = be32_to_cpu(from->sb_features2); | |
467 | } | |
468 | ||
1da177e4 | 469 | /* |
2bdf7cd0 | 470 | * Copy in core superblock to ondisk one. |
1da177e4 | 471 | * |
2bdf7cd0 | 472 | * The fields argument is mask of superblock fields to copy. |
1da177e4 LT |
473 | */ |
474 | void | |
2bdf7cd0 CH |
475 | xfs_sb_to_disk( |
476 | xfs_dsb_t *to, | |
477 | xfs_sb_t *from, | |
1da177e4 LT |
478 | __int64_t fields) |
479 | { | |
2bdf7cd0 CH |
480 | xfs_caddr_t to_ptr = (xfs_caddr_t)to; |
481 | xfs_caddr_t from_ptr = (xfs_caddr_t)from; | |
1da177e4 LT |
482 | xfs_sb_field_t f; |
483 | int first; | |
484 | int size; | |
485 | ||
1da177e4 | 486 | ASSERT(fields); |
1da177e4 LT |
487 | if (!fields) |
488 | return; | |
489 | ||
1da177e4 LT |
490 | while (fields) { |
491 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
492 | first = xfs_sb_info[f].offset; | |
493 | size = xfs_sb_info[f + 1].offset - first; | |
494 | ||
495 | ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); | |
496 | ||
497 | if (size == 1 || xfs_sb_info[f].type == 1) { | |
2bdf7cd0 | 498 | memcpy(to_ptr + first, from_ptr + first, size); |
1da177e4 LT |
499 | } else { |
500 | switch (size) { | |
501 | case 2: | |
2bdf7cd0 CH |
502 | *(__be16 *)(to_ptr + first) = |
503 | cpu_to_be16(*(__u16 *)(from_ptr + first)); | |
1da177e4 LT |
504 | break; |
505 | case 4: | |
2bdf7cd0 CH |
506 | *(__be32 *)(to_ptr + first) = |
507 | cpu_to_be32(*(__u32 *)(from_ptr + first)); | |
1da177e4 LT |
508 | break; |
509 | case 8: | |
2bdf7cd0 CH |
510 | *(__be64 *)(to_ptr + first) = |
511 | cpu_to_be64(*(__u64 *)(from_ptr + first)); | |
1da177e4 LT |
512 | break; |
513 | default: | |
514 | ASSERT(0); | |
515 | } | |
516 | } | |
517 | ||
518 | fields &= ~(1LL << f); | |
519 | } | |
520 | } | |
521 | ||
522 | /* | |
523 | * xfs_readsb | |
524 | * | |
525 | * Does the initial read of the superblock. | |
526 | */ | |
527 | int | |
764d1f89 | 528 | xfs_readsb(xfs_mount_t *mp, int flags) |
1da177e4 LT |
529 | { |
530 | unsigned int sector_size; | |
531 | unsigned int extra_flags; | |
532 | xfs_buf_t *bp; | |
1da177e4 LT |
533 | int error; |
534 | ||
535 | ASSERT(mp->m_sb_bp == NULL); | |
536 | ASSERT(mp->m_ddev_targp != NULL); | |
537 | ||
538 | /* | |
539 | * Allocate a (locked) buffer to hold the superblock. | |
540 | * This will be kept around at all times to optimize | |
541 | * access to the superblock. | |
542 | */ | |
543 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); | |
544 | extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED; | |
545 | ||
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 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 | /* | |
557 | * Initialize the mount structure from the superblock. | |
558 | * But first do some basic consistency checking. | |
559 | */ | |
2bdf7cd0 | 560 | xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp)); |
1da177e4 | 561 | |
764d1f89 | 562 | error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags); |
1da177e4 | 563 | if (error) { |
764d1f89 | 564 | xfs_fs_mount_cmn_err(flags, "SB validate failed"); |
1da177e4 LT |
565 | goto fail; |
566 | } | |
567 | ||
568 | /* | |
569 | * We must be able to do sector-sized and sector-aligned IO. | |
570 | */ | |
571 | if (sector_size > mp->m_sb.sb_sectsize) { | |
764d1f89 NS |
572 | xfs_fs_mount_cmn_err(flags, |
573 | "device supports only %u byte sectors (not %u)", | |
1da177e4 LT |
574 | sector_size, mp->m_sb.sb_sectsize); |
575 | error = ENOSYS; | |
576 | goto fail; | |
577 | } | |
578 | ||
579 | /* | |
580 | * If device sector size is smaller than the superblock size, | |
581 | * re-read the superblock so the buffer is correctly sized. | |
582 | */ | |
583 | if (sector_size < mp->m_sb.sb_sectsize) { | |
584 | XFS_BUF_UNMANAGE(bp); | |
585 | xfs_buf_relse(bp); | |
586 | sector_size = mp->m_sb.sb_sectsize; | |
587 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
588 | BTOBB(sector_size), extra_flags); | |
589 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 590 | xfs_fs_mount_cmn_err(flags, "SB re-read failed"); |
1da177e4 LT |
591 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
592 | goto fail; | |
593 | } | |
594 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
595 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
596 | } | |
597 | ||
5478eead LM |
598 | /* Initialize per-cpu counters */ |
599 | xfs_icsb_reinit_counters(mp); | |
8d280b98 | 600 | |
1da177e4 LT |
601 | mp->m_sb_bp = bp; |
602 | xfs_buf_relse(bp); | |
603 | ASSERT(XFS_BUF_VALUSEMA(bp) > 0); | |
604 | return 0; | |
605 | ||
606 | fail: | |
607 | if (bp) { | |
608 | XFS_BUF_UNMANAGE(bp); | |
609 | xfs_buf_relse(bp); | |
610 | } | |
611 | return error; | |
612 | } | |
613 | ||
614 | ||
615 | /* | |
616 | * xfs_mount_common | |
617 | * | |
618 | * Mount initialization code establishing various mount | |
619 | * fields from the superblock associated with the given | |
620 | * mount structure | |
621 | */ | |
ba0f32d4 | 622 | STATIC void |
1da177e4 LT |
623 | xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) |
624 | { | |
625 | int i; | |
626 | ||
627 | mp->m_agfrotor = mp->m_agirotor = 0; | |
628 | spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock"); | |
629 | mp->m_maxagi = mp->m_sb.sb_agcount; | |
630 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
631 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
632 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
633 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
634 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
635 | mp->m_litino = sbp->sb_inodesize - | |
636 | ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t)); | |
637 | mp->m_blockmask = sbp->sb_blocksize - 1; | |
638 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
639 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
640 | INIT_LIST_HEAD(&mp->m_del_inodes); | |
641 | ||
642 | /* | |
643 | * Setup for attributes, in case they get created. | |
644 | * This value is for inodes getting attributes for the first time, | |
645 | * the per-inode value is for old attribute values. | |
646 | */ | |
647 | ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048); | |
648 | switch (sbp->sb_inodesize) { | |
649 | case 256: | |
d8cc890d NS |
650 | mp->m_attroffset = XFS_LITINO(mp) - |
651 | XFS_BMDR_SPACE_CALC(MINABTPTRS); | |
1da177e4 LT |
652 | break; |
653 | case 512: | |
654 | case 1024: | |
655 | case 2048: | |
d8cc890d | 656 | mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS); |
1da177e4 LT |
657 | break; |
658 | default: | |
659 | ASSERT(0); | |
660 | } | |
661 | ASSERT(mp->m_attroffset < XFS_LITINO(mp)); | |
662 | ||
663 | for (i = 0; i < 2; i++) { | |
664 | mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
665 | xfs_alloc, i == 0); | |
666 | mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
667 | xfs_alloc, i == 0); | |
668 | } | |
669 | for (i = 0; i < 2; i++) { | |
670 | mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
671 | xfs_bmbt, i == 0); | |
672 | mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
673 | xfs_bmbt, i == 0); | |
674 | } | |
675 | for (i = 0; i < 2; i++) { | |
676 | mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
677 | xfs_inobt, i == 0); | |
678 | mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
679 | xfs_inobt, i == 0); | |
680 | } | |
681 | ||
682 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
683 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
684 | sbp->sb_inopblock); | |
685 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
686 | } | |
92821e2b DC |
687 | |
688 | /* | |
689 | * xfs_initialize_perag_data | |
690 | * | |
691 | * Read in each per-ag structure so we can count up the number of | |
692 | * allocated inodes, free inodes and used filesystem blocks as this | |
693 | * information is no longer persistent in the superblock. Once we have | |
694 | * this information, write it into the in-core superblock structure. | |
695 | */ | |
696 | STATIC int | |
697 | xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount) | |
698 | { | |
699 | xfs_agnumber_t index; | |
700 | xfs_perag_t *pag; | |
701 | xfs_sb_t *sbp = &mp->m_sb; | |
702 | uint64_t ifree = 0; | |
703 | uint64_t ialloc = 0; | |
704 | uint64_t bfree = 0; | |
705 | uint64_t bfreelst = 0; | |
706 | uint64_t btree = 0; | |
707 | int error; | |
708 | int s; | |
709 | ||
710 | for (index = 0; index < agcount; index++) { | |
711 | /* | |
712 | * read the agf, then the agi. This gets us | |
713 | * all the inforamtion we need and populates the | |
714 | * per-ag structures for us. | |
715 | */ | |
716 | error = xfs_alloc_pagf_init(mp, NULL, index, 0); | |
717 | if (error) | |
718 | return error; | |
719 | ||
720 | error = xfs_ialloc_pagi_init(mp, NULL, index); | |
721 | if (error) | |
722 | return error; | |
723 | pag = &mp->m_perag[index]; | |
724 | ifree += pag->pagi_freecount; | |
725 | ialloc += pag->pagi_count; | |
726 | bfree += pag->pagf_freeblks; | |
727 | bfreelst += pag->pagf_flcount; | |
728 | btree += pag->pagf_btreeblks; | |
729 | } | |
730 | /* | |
731 | * Overwrite incore superblock counters with just-read data | |
732 | */ | |
733 | s = XFS_SB_LOCK(mp); | |
734 | sbp->sb_ifree = ifree; | |
735 | sbp->sb_icount = ialloc; | |
736 | sbp->sb_fdblocks = bfree + bfreelst + btree; | |
737 | XFS_SB_UNLOCK(mp, s); | |
738 | ||
739 | /* Fixup the per-cpu counters as well. */ | |
740 | xfs_icsb_reinit_counters(mp); | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
1da177e4 LT |
745 | /* |
746 | * xfs_mountfs | |
747 | * | |
748 | * This function does the following on an initial mount of a file system: | |
749 | * - reads the superblock from disk and init the mount struct | |
750 | * - if we're a 32-bit kernel, do a size check on the superblock | |
751 | * so we don't mount terabyte filesystems | |
752 | * - init mount struct realtime fields | |
753 | * - allocate inode hash table for fs | |
754 | * - init directory manager | |
755 | * - perform recovery and init the log manager | |
756 | */ | |
757 | int | |
758 | xfs_mountfs( | |
b83bd138 | 759 | bhv_vfs_t *vfsp, |
1da177e4 LT |
760 | xfs_mount_t *mp, |
761 | int mfsi_flags) | |
762 | { | |
763 | xfs_buf_t *bp; | |
764 | xfs_sb_t *sbp = &(mp->m_sb); | |
765 | xfs_inode_t *rip; | |
67fcaa73 | 766 | bhv_vnode_t *rvp = NULL; |
1da177e4 LT |
767 | int readio_log, writeio_log; |
768 | xfs_daddr_t d; | |
84e1e99f | 769 | __uint64_t resblks; |
1da177e4 LT |
770 | __int64_t update_flags; |
771 | uint quotamount, quotaflags; | |
772 | int agno; | |
773 | int uuid_mounted = 0; | |
774 | int error = 0; | |
775 | ||
776 | if (mp->m_sb_bp == NULL) { | |
764d1f89 | 777 | if ((error = xfs_readsb(mp, mfsi_flags))) { |
014c2544 | 778 | return error; |
1da177e4 LT |
779 | } |
780 | } | |
781 | xfs_mount_common(mp, sbp); | |
782 | ||
783 | /* | |
784 | * Check if sb_agblocks is aligned at stripe boundary | |
785 | * If sb_agblocks is NOT aligned turn off m_dalign since | |
786 | * allocator alignment is within an ag, therefore ag has | |
787 | * to be aligned at stripe boundary. | |
788 | */ | |
789 | update_flags = 0LL; | |
790 | if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) { | |
791 | /* | |
792 | * If stripe unit and stripe width are not multiples | |
793 | * of the fs blocksize turn off alignment. | |
794 | */ | |
795 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || | |
796 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { | |
797 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
798 | cmn_err(CE_WARN, | |
799 | "XFS: alignment check 1 failed"); | |
800 | error = XFS_ERROR(EINVAL); | |
801 | goto error1; | |
802 | } | |
803 | mp->m_dalign = mp->m_swidth = 0; | |
804 | } else { | |
805 | /* | |
806 | * Convert the stripe unit and width to FSBs. | |
807 | */ | |
808 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); | |
809 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { | |
810 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
811 | error = XFS_ERROR(EINVAL); | |
812 | goto error1; | |
813 | } | |
814 | xfs_fs_cmn_err(CE_WARN, mp, | |
815 | "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)", | |
816 | mp->m_dalign, mp->m_swidth, | |
817 | sbp->sb_agblocks); | |
818 | ||
819 | mp->m_dalign = 0; | |
820 | mp->m_swidth = 0; | |
821 | } else if (mp->m_dalign) { | |
822 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); | |
823 | } else { | |
824 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
825 | xfs_fs_cmn_err(CE_WARN, mp, | |
826 | "stripe alignment turned off: sunit(%d) less than bsize(%d)", | |
827 | mp->m_dalign, | |
828 | mp->m_blockmask +1); | |
829 | error = XFS_ERROR(EINVAL); | |
830 | goto error1; | |
831 | } | |
832 | mp->m_swidth = 0; | |
833 | } | |
834 | } | |
835 | ||
836 | /* | |
837 | * Update superblock with new values | |
838 | * and log changes | |
839 | */ | |
840 | if (XFS_SB_VERSION_HASDALIGN(sbp)) { | |
841 | if (sbp->sb_unit != mp->m_dalign) { | |
842 | sbp->sb_unit = mp->m_dalign; | |
843 | update_flags |= XFS_SB_UNIT; | |
844 | } | |
845 | if (sbp->sb_width != mp->m_swidth) { | |
846 | sbp->sb_width = mp->m_swidth; | |
847 | update_flags |= XFS_SB_WIDTH; | |
848 | } | |
849 | } | |
850 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && | |
851 | XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) { | |
852 | mp->m_dalign = sbp->sb_unit; | |
853 | mp->m_swidth = sbp->sb_width; | |
854 | } | |
855 | ||
856 | xfs_alloc_compute_maxlevels(mp); | |
857 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); | |
858 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); | |
859 | xfs_ialloc_compute_maxlevels(mp); | |
860 | ||
861 | if (sbp->sb_imax_pct) { | |
862 | __uint64_t icount; | |
863 | ||
864 | /* Make sure the maximum inode count is a multiple of the | |
865 | * units we allocate inodes in. | |
866 | */ | |
867 | ||
868 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
869 | do_div(icount, 100); | |
870 | do_div(icount, mp->m_ialloc_blks); | |
871 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << | |
872 | sbp->sb_inopblog; | |
873 | } else | |
874 | mp->m_maxicount = 0; | |
875 | ||
876 | mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog); | |
877 | ||
878 | /* | |
879 | * XFS uses the uuid from the superblock as the unique | |
880 | * identifier for fsid. We can not use the uuid from the volume | |
881 | * since a single partition filesystem is identical to a single | |
882 | * partition volume/filesystem. | |
883 | */ | |
884 | if ((mfsi_flags & XFS_MFSI_SECOND) == 0 && | |
885 | (mp->m_flags & XFS_MOUNT_NOUUID) == 0) { | |
84e1e99f | 886 | __uint64_t ret64; |
1da177e4 LT |
887 | if (xfs_uuid_mount(mp)) { |
888 | error = XFS_ERROR(EINVAL); | |
889 | goto error1; | |
890 | } | |
891 | uuid_mounted=1; | |
892 | ret64 = uuid_hash64(&sbp->sb_uuid); | |
893 | memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64)); | |
894 | } | |
895 | ||
896 | /* | |
897 | * Set the default minimum read and write sizes unless | |
898 | * already specified in a mount option. | |
899 | * We use smaller I/O sizes when the file system | |
900 | * is being used for NFS service (wsync mount option). | |
901 | */ | |
902 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { | |
903 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
904 | readio_log = XFS_WSYNC_READIO_LOG; | |
905 | writeio_log = XFS_WSYNC_WRITEIO_LOG; | |
906 | } else { | |
907 | readio_log = XFS_READIO_LOG_LARGE; | |
908 | writeio_log = XFS_WRITEIO_LOG_LARGE; | |
909 | } | |
910 | } else { | |
911 | readio_log = mp->m_readio_log; | |
912 | writeio_log = mp->m_writeio_log; | |
913 | } | |
914 | ||
1da177e4 LT |
915 | if (sbp->sb_blocklog > readio_log) { |
916 | mp->m_readio_log = sbp->sb_blocklog; | |
917 | } else { | |
918 | mp->m_readio_log = readio_log; | |
919 | } | |
920 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); | |
921 | if (sbp->sb_blocklog > writeio_log) { | |
922 | mp->m_writeio_log = sbp->sb_blocklog; | |
923 | } else { | |
924 | mp->m_writeio_log = writeio_log; | |
925 | } | |
926 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); | |
927 | ||
928 | /* | |
425f9ddd ES |
929 | * Set the inode cluster size. |
930 | * This may still be overridden by the file system | |
1da177e4 LT |
931 | * block size if it is larger than the chosen cluster size. |
932 | */ | |
425f9ddd ES |
933 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; |
934 | ||
1da177e4 LT |
935 | /* |
936 | * Set whether we're using inode alignment. | |
937 | */ | |
938 | if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) && | |
939 | mp->m_sb.sb_inoalignmt >= | |
940 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) | |
941 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; | |
942 | else | |
943 | mp->m_inoalign_mask = 0; | |
944 | /* | |
945 | * If we are using stripe alignment, check whether | |
946 | * the stripe unit is a multiple of the inode alignment | |
947 | */ | |
948 | if (mp->m_dalign && mp->m_inoalign_mask && | |
949 | !(mp->m_dalign & mp->m_inoalign_mask)) | |
950 | mp->m_sinoalign = mp->m_dalign; | |
951 | else | |
952 | mp->m_sinoalign = 0; | |
953 | /* | |
954 | * Check that the data (and log if separate) are an ok size. | |
955 | */ | |
956 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); | |
957 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { | |
958 | cmn_err(CE_WARN, "XFS: size check 1 failed"); | |
959 | error = XFS_ERROR(E2BIG); | |
960 | goto error1; | |
961 | } | |
962 | error = xfs_read_buf(mp, mp->m_ddev_targp, | |
963 | d - XFS_FSS_TO_BB(mp, 1), | |
964 | XFS_FSS_TO_BB(mp, 1), 0, &bp); | |
965 | if (!error) { | |
966 | xfs_buf_relse(bp); | |
967 | } else { | |
968 | cmn_err(CE_WARN, "XFS: size check 2 failed"); | |
969 | if (error == ENOSPC) { | |
970 | error = XFS_ERROR(E2BIG); | |
971 | } | |
972 | goto error1; | |
973 | } | |
974 | ||
975 | if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) && | |
976 | mp->m_logdev_targp != mp->m_ddev_targp) { | |
977 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); | |
978 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { | |
979 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
980 | error = XFS_ERROR(E2BIG); | |
981 | goto error1; | |
982 | } | |
983 | error = xfs_read_buf(mp, mp->m_logdev_targp, | |
984 | d - XFS_FSB_TO_BB(mp, 1), | |
985 | XFS_FSB_TO_BB(mp, 1), 0, &bp); | |
986 | if (!error) { | |
987 | xfs_buf_relse(bp); | |
988 | } else { | |
989 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
990 | if (error == ENOSPC) { | |
991 | error = XFS_ERROR(E2BIG); | |
992 | } | |
993 | goto error1; | |
994 | } | |
995 | } | |
996 | ||
997 | /* | |
998 | * Initialize realtime fields in the mount structure | |
999 | */ | |
1000 | if ((error = xfs_rtmount_init(mp))) { | |
1001 | cmn_err(CE_WARN, "XFS: RT mount failed"); | |
1002 | goto error1; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * For client case we are done now | |
1007 | */ | |
1008 | if (mfsi_flags & XFS_MFSI_CLIENT) { | |
014c2544 | 1009 | return 0; |
1da177e4 LT |
1010 | } |
1011 | ||
1012 | /* | |
1013 | * Copies the low order bits of the timestamp and the randomly | |
1014 | * set "sequence" number out of a UUID. | |
1015 | */ | |
1016 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); | |
1017 | ||
1018 | /* | |
1019 | * The vfs structure needs to have a file system independent | |
1020 | * way of checking for the invariant file system ID. Since it | |
1021 | * can't look at mount structures it has a pointer to the data | |
1022 | * in the mount structure. | |
1023 | * | |
1024 | * File systems that don't support user level file handles (i.e. | |
1025 | * all of them except for XFS) will leave vfs_altfsid as NULL. | |
1026 | */ | |
1027 | vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid; | |
1028 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ | |
1029 | ||
f6c2d1fa | 1030 | xfs_dir_mount(mp); |
1da177e4 LT |
1031 | |
1032 | /* | |
1033 | * Initialize the attribute manager's entries. | |
1034 | */ | |
1035 | mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; | |
1036 | ||
1037 | /* | |
1038 | * Initialize the precomputed transaction reservations values. | |
1039 | */ | |
1040 | xfs_trans_init(mp); | |
1041 | ||
1da177e4 LT |
1042 | /* |
1043 | * Allocate and initialize the per-ag data. | |
1044 | */ | |
1045 | init_rwsem(&mp->m_peraglock); | |
1046 | mp->m_perag = | |
1047 | kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP); | |
1048 | ||
c11e2c36 | 1049 | mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount); |
1da177e4 LT |
1050 | |
1051 | /* | |
1052 | * log's mount-time initialization. Perform 1st part recovery if needed | |
1053 | */ | |
1054 | if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */ | |
1055 | error = xfs_log_mount(mp, mp->m_logdev_targp, | |
1056 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), | |
1057 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); | |
1058 | if (error) { | |
1059 | cmn_err(CE_WARN, "XFS: log mount failed"); | |
1060 | goto error2; | |
1061 | } | |
1062 | } else { /* No log has been defined */ | |
1063 | cmn_err(CE_WARN, "XFS: no log defined"); | |
1064 | XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp); | |
1065 | error = XFS_ERROR(EFSCORRUPTED); | |
1066 | goto error2; | |
1067 | } | |
1068 | ||
92821e2b DC |
1069 | /* |
1070 | * Now the log is mounted, we know if it was an unclean shutdown or | |
1071 | * not. If it was, with the first phase of recovery has completed, we | |
1072 | * have consistent AG blocks on disk. We have not recovered EFIs yet, | |
1073 | * but they are recovered transactionally in the second recovery phase | |
1074 | * later. | |
1075 | * | |
1076 | * Hence we can safely re-initialise incore superblock counters from | |
1077 | * the per-ag data. These may not be correct if the filesystem was not | |
1078 | * cleanly unmounted, so we need to wait for recovery to finish before | |
1079 | * doing this. | |
1080 | * | |
1081 | * If the filesystem was cleanly unmounted, then we can trust the | |
1082 | * values in the superblock to be correct and we don't need to do | |
1083 | * anything here. | |
1084 | * | |
1085 | * If we are currently making the filesystem, the initialisation will | |
1086 | * fail as the perag data is in an undefined state. | |
1087 | */ | |
1088 | ||
1089 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && | |
1090 | !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) && | |
1091 | !mp->m_sb.sb_inprogress) { | |
1092 | error = xfs_initialize_perag_data(mp, sbp->sb_agcount); | |
1093 | if (error) { | |
1094 | goto error2; | |
1095 | } | |
1096 | } | |
1da177e4 LT |
1097 | /* |
1098 | * Get and sanity-check the root inode. | |
1099 | * Save the pointer to it in the mount structure. | |
1100 | */ | |
1101 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0); | |
1102 | if (error) { | |
1103 | cmn_err(CE_WARN, "XFS: failed to read root inode"); | |
1104 | goto error3; | |
1105 | } | |
1106 | ||
1107 | ASSERT(rip != NULL); | |
1108 | rvp = XFS_ITOV(rip); | |
1109 | ||
1110 | if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) { | |
1111 | cmn_err(CE_WARN, "XFS: corrupted root inode"); | |
b6574520 NS |
1112 | cmn_err(CE_WARN, "Device %s - root %llu is not a directory", |
1113 | XFS_BUFTARG_NAME(mp->m_ddev_targp), | |
1114 | (unsigned long long)rip->i_ino); | |
1da177e4 LT |
1115 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
1116 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, | |
1117 | mp); | |
1118 | error = XFS_ERROR(EFSCORRUPTED); | |
1119 | goto error4; | |
1120 | } | |
1121 | mp->m_rootip = rip; /* save it */ | |
1122 | ||
1123 | xfs_iunlock(rip, XFS_ILOCK_EXCL); | |
1124 | ||
1125 | /* | |
1126 | * Initialize realtime inode pointers in the mount structure | |
1127 | */ | |
1128 | if ((error = xfs_rtmount_inodes(mp))) { | |
1129 | /* | |
1130 | * Free up the root inode. | |
1131 | */ | |
1132 | cmn_err(CE_WARN, "XFS: failed to read RT inodes"); | |
1133 | goto error4; | |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * If fs is not mounted readonly, then update the superblock | |
1138 | * unit and width changes. | |
1139 | */ | |
1140 | if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY)) | |
1141 | xfs_mount_log_sbunit(mp, update_flags); | |
1142 | ||
1143 | /* | |
1144 | * Initialise the XFS quota management subsystem for this mount | |
1145 | */ | |
1146 | if ((error = XFS_QM_INIT(mp, "amount, "aflags))) | |
1147 | goto error4; | |
1148 | ||
1149 | /* | |
1150 | * Finish recovering the file system. This part needed to be | |
1151 | * delayed until after the root and real-time bitmap inodes | |
1152 | * were consistently read in. | |
1153 | */ | |
1154 | error = xfs_log_mount_finish(mp, mfsi_flags); | |
1155 | if (error) { | |
1156 | cmn_err(CE_WARN, "XFS: log mount finish failed"); | |
1157 | goto error4; | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * Complete the quota initialisation, post-log-replay component. | |
1162 | */ | |
1163 | if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags))) | |
1164 | goto error4; | |
1165 | ||
84e1e99f DC |
1166 | /* |
1167 | * Now we are mounted, reserve a small amount of unused space for | |
1168 | * privileged transactions. This is needed so that transaction | |
1169 | * space required for critical operations can dip into this pool | |
1170 | * when at ENOSPC. This is needed for operations like create with | |
1171 | * attr, unwritten extent conversion at ENOSPC, etc. Data allocations | |
1172 | * are not allowed to use this reserved space. | |
1173 | * | |
1174 | * We default to 5% or 1024 fsbs of space reserved, whichever is smaller. | |
1175 | * This may drive us straight to ENOSPC on mount, but that implies | |
1176 | * we were already there on the last unmount. | |
1177 | */ | |
39726be2 CH |
1178 | resblks = mp->m_sb.sb_dblocks; |
1179 | do_div(resblks, 20); | |
1180 | resblks = min_t(__uint64_t, resblks, 1024); | |
84e1e99f DC |
1181 | xfs_reserve_blocks(mp, &resblks, NULL); |
1182 | ||
1da177e4 LT |
1183 | return 0; |
1184 | ||
1185 | error4: | |
1186 | /* | |
1187 | * Free up the root inode. | |
1188 | */ | |
1189 | VN_RELE(rvp); | |
1190 | error3: | |
1191 | xfs_log_unmount_dealloc(mp); | |
1192 | error2: | |
1da177e4 LT |
1193 | for (agno = 0; agno < sbp->sb_agcount; agno++) |
1194 | if (mp->m_perag[agno].pagb_list) | |
1195 | kmem_free(mp->m_perag[agno].pagb_list, | |
1196 | sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS); | |
1197 | kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t)); | |
1198 | mp->m_perag = NULL; | |
1199 | /* FALLTHROUGH */ | |
1200 | error1: | |
1201 | if (uuid_mounted) | |
1202 | xfs_uuid_unmount(mp); | |
1203 | xfs_freesb(mp); | |
1204 | return error; | |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * xfs_unmountfs | |
1209 | * | |
1210 | * This flushes out the inodes,dquots and the superblock, unmounts the | |
1211 | * log and makes sure that incore structures are freed. | |
1212 | */ | |
1213 | int | |
1214 | xfs_unmountfs(xfs_mount_t *mp, struct cred *cr) | |
1215 | { | |
b83bd138 | 1216 | struct bhv_vfs *vfsp = XFS_MTOVFS(mp); |
1da177e4 LT |
1217 | #if defined(DEBUG) || defined(INDUCE_IO_ERROR) |
1218 | int64_t fsid; | |
1219 | #endif | |
84e1e99f | 1220 | __uint64_t resblks; |
1da177e4 | 1221 | |
641c56fb DC |
1222 | /* |
1223 | * We can potentially deadlock here if we have an inode cluster | |
1224 | * that has been freed has it's buffer still pinned in memory because | |
1225 | * the transaction is still sitting in a iclog. The stale inodes | |
1226 | * on that buffer will have their flush locks held until the | |
1227 | * transaction hits the disk and the callbacks run. the inode | |
1228 | * flush takes the flush lock unconditionally and with nothing to | |
1229 | * push out the iclog we will never get that unlocked. hence we | |
1230 | * need to force the log first. | |
1231 | */ | |
1232 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
efa80278 | 1233 | xfs_iflush_all(mp); |
1da177e4 | 1234 | |
ee2a4f7c | 1235 | XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING); |
1da177e4 LT |
1236 | |
1237 | /* | |
1238 | * Flush out the log synchronously so that we know for sure | |
1239 | * that nothing is pinned. This is important because bflush() | |
1240 | * will skip pinned buffers. | |
1241 | */ | |
1242 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
1243 | ||
1244 | xfs_binval(mp->m_ddev_targp); | |
1245 | if (mp->m_rtdev_targp) { | |
1246 | xfs_binval(mp->m_rtdev_targp); | |
1247 | } | |
1248 | ||
84e1e99f DC |
1249 | /* |
1250 | * Unreserve any blocks we have so that when we unmount we don't account | |
1251 | * the reserved free space as used. This is really only necessary for | |
1252 | * lazy superblock counting because it trusts the incore superblock | |
1253 | * counters to be aboslutely correct on clean unmount. | |
1254 | * | |
1255 | * We don't bother correcting this elsewhere for lazy superblock | |
1256 | * counting because on mount of an unclean filesystem we reconstruct the | |
1257 | * correct counter value and this is irrelevant. | |
1258 | * | |
1259 | * For non-lazy counter filesystems, this doesn't matter at all because | |
1260 | * we only every apply deltas to the superblock and hence the incore | |
1261 | * value does not matter.... | |
1262 | */ | |
1263 | resblks = 0; | |
1264 | xfs_reserve_blocks(mp, &resblks, NULL); | |
1265 | ||
92821e2b | 1266 | xfs_log_sbcount(mp, 1); |
1da177e4 | 1267 | xfs_unmountfs_writesb(mp); |
1da177e4 | 1268 | xfs_unmountfs_wait(mp); /* wait for async bufs */ |
1da177e4 LT |
1269 | xfs_log_unmount(mp); /* Done! No more fs ops. */ |
1270 | ||
1271 | xfs_freesb(mp); | |
1272 | ||
1273 | /* | |
1274 | * All inodes from this mount point should be freed. | |
1275 | */ | |
1276 | ASSERT(mp->m_inodes == NULL); | |
1277 | ||
1da177e4 LT |
1278 | xfs_unmountfs_close(mp, cr); |
1279 | if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0) | |
1280 | xfs_uuid_unmount(mp); | |
1281 | ||
1282 | #if defined(DEBUG) || defined(INDUCE_IO_ERROR) | |
1283 | /* | |
1284 | * clear all error tags on this filesystem | |
1285 | */ | |
1286 | memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t)); | |
1287 | xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0); | |
1288 | #endif | |
1289 | XFS_IODONE(vfsp); | |
1290 | xfs_mount_free(mp, 1); | |
1291 | return 0; | |
1292 | } | |
1293 | ||
1294 | void | |
1295 | xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr) | |
1296 | { | |
49ee6c91 | 1297 | if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) |
1da177e4 LT |
1298 | xfs_free_buftarg(mp->m_logdev_targp, 1); |
1299 | if (mp->m_rtdev_targp) | |
1300 | xfs_free_buftarg(mp->m_rtdev_targp, 1); | |
1301 | xfs_free_buftarg(mp->m_ddev_targp, 0); | |
1302 | } | |
1303 | ||
ba0f32d4 | 1304 | STATIC void |
1da177e4 LT |
1305 | xfs_unmountfs_wait(xfs_mount_t *mp) |
1306 | { | |
1307 | if (mp->m_logdev_targp != mp->m_ddev_targp) | |
1308 | xfs_wait_buftarg(mp->m_logdev_targp); | |
1309 | if (mp->m_rtdev_targp) | |
1310 | xfs_wait_buftarg(mp->m_rtdev_targp); | |
1311 | xfs_wait_buftarg(mp->m_ddev_targp); | |
1312 | } | |
1313 | ||
92821e2b DC |
1314 | int |
1315 | xfs_fs_writable(xfs_mount_t *mp) | |
1316 | { | |
1317 | bhv_vfs_t *vfsp = XFS_MTOVFS(mp); | |
1318 | ||
1319 | return !(vfs_test_for_freeze(vfsp) || XFS_FORCED_SHUTDOWN(mp) || | |
1320 | (vfsp->vfs_flag & VFS_RDONLY)); | |
1321 | } | |
1322 | ||
1323 | /* | |
1324 | * xfs_log_sbcount | |
1325 | * | |
1326 | * Called either periodically to keep the on disk superblock values | |
1327 | * roughly up to date or from unmount to make sure the values are | |
1328 | * correct on a clean unmount. | |
1329 | * | |
1330 | * Note this code can be called during the process of freezing, so | |
1331 | * we may need to use the transaction allocator which does not not | |
1332 | * block when the transaction subsystem is in its frozen state. | |
1333 | */ | |
1334 | int | |
1335 | xfs_log_sbcount( | |
1336 | xfs_mount_t *mp, | |
1337 | uint sync) | |
1338 | { | |
1339 | xfs_trans_t *tp; | |
1340 | int error; | |
1341 | ||
1342 | if (!xfs_fs_writable(mp)) | |
1343 | return 0; | |
1344 | ||
1345 | xfs_icsb_sync_counters(mp); | |
1346 | ||
1347 | /* | |
1348 | * we don't need to do this if we are updating the superblock | |
1349 | * counters on every modification. | |
1350 | */ | |
1351 | if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) | |
1352 | return 0; | |
1353 | ||
1354 | tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT); | |
1355 | error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1356 | XFS_DEFAULT_LOG_COUNT); | |
1357 | if (error) { | |
1358 | xfs_trans_cancel(tp, 0); | |
1359 | return error; | |
1360 | } | |
1361 | ||
1362 | xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS); | |
1363 | if (sync) | |
1364 | xfs_trans_set_sync(tp); | |
1365 | xfs_trans_commit(tp, 0); | |
1366 | ||
1367 | return 0; | |
1368 | } | |
1369 | ||
2bdf7cd0 CH |
1370 | STATIC void |
1371 | xfs_mark_shared_ro( | |
1372 | xfs_mount_t *mp, | |
1373 | xfs_buf_t *bp) | |
1374 | { | |
1375 | xfs_dsb_t *sb = XFS_BUF_TO_SBP(bp); | |
1376 | __uint16_t version; | |
1377 | ||
1378 | if (!(sb->sb_flags & XFS_SBF_READONLY)) | |
1379 | sb->sb_flags |= XFS_SBF_READONLY; | |
1380 | ||
1381 | version = be16_to_cpu(sb->sb_versionnum); | |
1382 | if ((version & XFS_SB_VERSION_NUMBITS) != XFS_SB_VERSION_4 || | |
1383 | !(version & XFS_SB_VERSION_SHAREDBIT)) | |
1384 | version |= XFS_SB_VERSION_SHAREDBIT; | |
1385 | sb->sb_versionnum = cpu_to_be16(version); | |
1386 | } | |
1387 | ||
1da177e4 LT |
1388 | int |
1389 | xfs_unmountfs_writesb(xfs_mount_t *mp) | |
1390 | { | |
1391 | xfs_buf_t *sbp; | |
1da177e4 LT |
1392 | int error = 0; |
1393 | ||
1394 | /* | |
1395 | * skip superblock write if fs is read-only, or | |
1396 | * if we are doing a forced umount. | |
1397 | */ | |
1da177e4 LT |
1398 | if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY || |
1399 | XFS_FORCED_SHUTDOWN(mp))) { | |
8d280b98 | 1400 | |
92821e2b | 1401 | sbp = xfs_getsb(mp, 0); |
8d280b98 | 1402 | |
1da177e4 LT |
1403 | /* |
1404 | * mark shared-readonly if desired | |
1405 | */ | |
2bdf7cd0 CH |
1406 | if (mp->m_mk_sharedro) |
1407 | xfs_mark_shared_ro(mp, sbp); | |
92821e2b | 1408 | |
1da177e4 LT |
1409 | XFS_BUF_UNDONE(sbp); |
1410 | XFS_BUF_UNREAD(sbp); | |
1411 | XFS_BUF_UNDELAYWRITE(sbp); | |
1412 | XFS_BUF_WRITE(sbp); | |
1413 | XFS_BUF_UNASYNC(sbp); | |
1414 | ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp); | |
1415 | xfsbdstrat(mp, sbp); | |
1416 | /* Nevermind errors we might get here. */ | |
1417 | error = xfs_iowait(sbp); | |
1418 | if (error) | |
1419 | xfs_ioerror_alert("xfs_unmountfs_writesb", | |
1420 | mp, sbp, XFS_BUF_ADDR(sbp)); | |
1421 | if (error && mp->m_mk_sharedro) | |
1422 | xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly"); | |
92821e2b | 1423 | xfs_buf_relse(sbp); |
1da177e4 | 1424 | } |
014c2544 | 1425 | return error; |
1da177e4 LT |
1426 | } |
1427 | ||
1428 | /* | |
1429 | * xfs_mod_sb() can be used to copy arbitrary changes to the | |
1430 | * in-core superblock into the superblock buffer to be logged. | |
1431 | * It does not provide the higher level of locking that is | |
1432 | * needed to protect the in-core superblock from concurrent | |
1433 | * access. | |
1434 | */ | |
1435 | void | |
1436 | xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) | |
1437 | { | |
1438 | xfs_buf_t *bp; | |
1439 | int first; | |
1440 | int last; | |
1441 | xfs_mount_t *mp; | |
1da177e4 LT |
1442 | xfs_sb_field_t f; |
1443 | ||
1444 | ASSERT(fields); | |
1445 | if (!fields) | |
1446 | return; | |
1447 | mp = tp->t_mountp; | |
1448 | bp = xfs_trans_getsb(tp, mp, 0); | |
1da177e4 LT |
1449 | first = sizeof(xfs_sb_t); |
1450 | last = 0; | |
1451 | ||
1452 | /* translate/copy */ | |
1453 | ||
2bdf7cd0 | 1454 | xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields); |
1da177e4 LT |
1455 | |
1456 | /* find modified range */ | |
1457 | ||
1458 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
1459 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1460 | first = xfs_sb_info[f].offset; | |
1461 | ||
1462 | f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); | |
1463 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1464 | last = xfs_sb_info[f + 1].offset - 1; | |
1465 | ||
1466 | xfs_trans_log_buf(tp, bp, first, last); | |
1467 | } | |
d210a28c | 1468 | |
d210a28c | 1469 | |
1da177e4 LT |
1470 | /* |
1471 | * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply | |
1472 | * a delta to a specified field in the in-core superblock. Simply | |
1473 | * switch on the field indicated and apply the delta to that field. | |
1474 | * Fields are not allowed to dip below zero, so if the delta would | |
1475 | * do this do not apply it and return EINVAL. | |
1476 | * | |
1477 | * The SB_LOCK must be held when this routine is called. | |
1478 | */ | |
8d280b98 | 1479 | int |
20f4ebf2 DC |
1480 | xfs_mod_incore_sb_unlocked( |
1481 | xfs_mount_t *mp, | |
1482 | xfs_sb_field_t field, | |
1483 | int64_t delta, | |
1484 | int rsvd) | |
1da177e4 LT |
1485 | { |
1486 | int scounter; /* short counter for 32 bit fields */ | |
1487 | long long lcounter; /* long counter for 64 bit fields */ | |
1488 | long long res_used, rem; | |
1489 | ||
1490 | /* | |
1491 | * With the in-core superblock spin lock held, switch | |
1492 | * on the indicated field. Apply the delta to the | |
1493 | * proper field. If the fields value would dip below | |
1494 | * 0, then do not apply the delta and return EINVAL. | |
1495 | */ | |
1496 | switch (field) { | |
1497 | case XFS_SBS_ICOUNT: | |
1498 | lcounter = (long long)mp->m_sb.sb_icount; | |
1499 | lcounter += delta; | |
1500 | if (lcounter < 0) { | |
1501 | ASSERT(0); | |
014c2544 | 1502 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1503 | } |
1504 | mp->m_sb.sb_icount = lcounter; | |
014c2544 | 1505 | return 0; |
1da177e4 LT |
1506 | case XFS_SBS_IFREE: |
1507 | lcounter = (long long)mp->m_sb.sb_ifree; | |
1508 | lcounter += delta; | |
1509 | if (lcounter < 0) { | |
1510 | ASSERT(0); | |
014c2544 | 1511 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1512 | } |
1513 | mp->m_sb.sb_ifree = lcounter; | |
014c2544 | 1514 | return 0; |
1da177e4 | 1515 | case XFS_SBS_FDBLOCKS: |
4be536de DC |
1516 | lcounter = (long long) |
1517 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); | |
1da177e4 LT |
1518 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
1519 | ||
1520 | if (delta > 0) { /* Putting blocks back */ | |
1521 | if (res_used > delta) { | |
1522 | mp->m_resblks_avail += delta; | |
1523 | } else { | |
1524 | rem = delta - res_used; | |
1525 | mp->m_resblks_avail = mp->m_resblks; | |
1526 | lcounter += rem; | |
1527 | } | |
1528 | } else { /* Taking blocks away */ | |
1529 | ||
1530 | lcounter += delta; | |
1531 | ||
1532 | /* | |
1533 | * If were out of blocks, use any available reserved blocks if | |
1534 | * were allowed to. | |
1535 | */ | |
1536 | ||
1537 | if (lcounter < 0) { | |
1538 | if (rsvd) { | |
1539 | lcounter = (long long)mp->m_resblks_avail + delta; | |
1540 | if (lcounter < 0) { | |
014c2544 | 1541 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1542 | } |
1543 | mp->m_resblks_avail = lcounter; | |
014c2544 | 1544 | return 0; |
1da177e4 | 1545 | } else { /* not reserved */ |
014c2544 | 1546 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1547 | } |
1548 | } | |
1549 | } | |
1550 | ||
4be536de | 1551 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
014c2544 | 1552 | return 0; |
1da177e4 LT |
1553 | case XFS_SBS_FREXTENTS: |
1554 | lcounter = (long long)mp->m_sb.sb_frextents; | |
1555 | lcounter += delta; | |
1556 | if (lcounter < 0) { | |
014c2544 | 1557 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1558 | } |
1559 | mp->m_sb.sb_frextents = lcounter; | |
014c2544 | 1560 | return 0; |
1da177e4 LT |
1561 | case XFS_SBS_DBLOCKS: |
1562 | lcounter = (long long)mp->m_sb.sb_dblocks; | |
1563 | lcounter += delta; | |
1564 | if (lcounter < 0) { | |
1565 | ASSERT(0); | |
014c2544 | 1566 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1567 | } |
1568 | mp->m_sb.sb_dblocks = lcounter; | |
014c2544 | 1569 | return 0; |
1da177e4 LT |
1570 | case XFS_SBS_AGCOUNT: |
1571 | scounter = mp->m_sb.sb_agcount; | |
1572 | scounter += delta; | |
1573 | if (scounter < 0) { | |
1574 | ASSERT(0); | |
014c2544 | 1575 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1576 | } |
1577 | mp->m_sb.sb_agcount = scounter; | |
014c2544 | 1578 | return 0; |
1da177e4 LT |
1579 | case XFS_SBS_IMAX_PCT: |
1580 | scounter = mp->m_sb.sb_imax_pct; | |
1581 | scounter += delta; | |
1582 | if (scounter < 0) { | |
1583 | ASSERT(0); | |
014c2544 | 1584 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1585 | } |
1586 | mp->m_sb.sb_imax_pct = scounter; | |
014c2544 | 1587 | return 0; |
1da177e4 LT |
1588 | case XFS_SBS_REXTSIZE: |
1589 | scounter = mp->m_sb.sb_rextsize; | |
1590 | scounter += delta; | |
1591 | if (scounter < 0) { | |
1592 | ASSERT(0); | |
014c2544 | 1593 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1594 | } |
1595 | mp->m_sb.sb_rextsize = scounter; | |
014c2544 | 1596 | return 0; |
1da177e4 LT |
1597 | case XFS_SBS_RBMBLOCKS: |
1598 | scounter = mp->m_sb.sb_rbmblocks; | |
1599 | scounter += delta; | |
1600 | if (scounter < 0) { | |
1601 | ASSERT(0); | |
014c2544 | 1602 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1603 | } |
1604 | mp->m_sb.sb_rbmblocks = scounter; | |
014c2544 | 1605 | return 0; |
1da177e4 LT |
1606 | case XFS_SBS_RBLOCKS: |
1607 | lcounter = (long long)mp->m_sb.sb_rblocks; | |
1608 | lcounter += delta; | |
1609 | if (lcounter < 0) { | |
1610 | ASSERT(0); | |
014c2544 | 1611 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1612 | } |
1613 | mp->m_sb.sb_rblocks = lcounter; | |
014c2544 | 1614 | return 0; |
1da177e4 LT |
1615 | case XFS_SBS_REXTENTS: |
1616 | lcounter = (long long)mp->m_sb.sb_rextents; | |
1617 | lcounter += delta; | |
1618 | if (lcounter < 0) { | |
1619 | ASSERT(0); | |
014c2544 | 1620 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1621 | } |
1622 | mp->m_sb.sb_rextents = lcounter; | |
014c2544 | 1623 | return 0; |
1da177e4 LT |
1624 | case XFS_SBS_REXTSLOG: |
1625 | scounter = mp->m_sb.sb_rextslog; | |
1626 | scounter += delta; | |
1627 | if (scounter < 0) { | |
1628 | ASSERT(0); | |
014c2544 | 1629 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1630 | } |
1631 | mp->m_sb.sb_rextslog = scounter; | |
014c2544 | 1632 | return 0; |
1da177e4 LT |
1633 | default: |
1634 | ASSERT(0); | |
014c2544 | 1635 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1636 | } |
1637 | } | |
1638 | ||
1639 | /* | |
1640 | * xfs_mod_incore_sb() is used to change a field in the in-core | |
1641 | * superblock structure by the specified delta. This modification | |
1642 | * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked() | |
1643 | * routine to do the work. | |
1644 | */ | |
1645 | int | |
20f4ebf2 DC |
1646 | xfs_mod_incore_sb( |
1647 | xfs_mount_t *mp, | |
1648 | xfs_sb_field_t field, | |
1649 | int64_t delta, | |
1650 | int rsvd) | |
1da177e4 LT |
1651 | { |
1652 | unsigned long s; | |
1653 | int status; | |
1654 | ||
8d280b98 DC |
1655 | /* check for per-cpu counters */ |
1656 | switch (field) { | |
1657 | #ifdef HAVE_PERCPU_SB | |
1658 | case XFS_SBS_ICOUNT: | |
1659 | case XFS_SBS_IFREE: | |
1660 | case XFS_SBS_FDBLOCKS: | |
1661 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
1662 | status = xfs_icsb_modify_counters(mp, field, | |
1663 | delta, rsvd); | |
1664 | break; | |
1665 | } | |
1666 | /* FALLTHROUGH */ | |
1667 | #endif | |
1668 | default: | |
1669 | s = XFS_SB_LOCK(mp); | |
1670 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); | |
1671 | XFS_SB_UNLOCK(mp, s); | |
1672 | break; | |
1673 | } | |
1674 | ||
014c2544 | 1675 | return status; |
1da177e4 LT |
1676 | } |
1677 | ||
1678 | /* | |
1679 | * xfs_mod_incore_sb_batch() is used to change more than one field | |
1680 | * in the in-core superblock structure at a time. This modification | |
1681 | * is protected by a lock internal to this module. The fields and | |
1682 | * changes to those fields are specified in the array of xfs_mod_sb | |
1683 | * structures passed in. | |
1684 | * | |
1685 | * Either all of the specified deltas will be applied or none of | |
1686 | * them will. If any modified field dips below 0, then all modifications | |
1687 | * will be backed out and EINVAL will be returned. | |
1688 | */ | |
1689 | int | |
1690 | xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd) | |
1691 | { | |
1692 | unsigned long s; | |
1693 | int status=0; | |
1694 | xfs_mod_sb_t *msbp; | |
1695 | ||
1696 | /* | |
1697 | * Loop through the array of mod structures and apply each | |
1698 | * individually. If any fail, then back out all those | |
1699 | * which have already been applied. Do all of this within | |
1700 | * the scope of the SB_LOCK so that all of the changes will | |
1701 | * be atomic. | |
1702 | */ | |
1703 | s = XFS_SB_LOCK(mp); | |
1704 | msbp = &msb[0]; | |
1705 | for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) { | |
1706 | /* | |
1707 | * Apply the delta at index n. If it fails, break | |
1708 | * from the loop so we'll fall into the undo loop | |
1709 | * below. | |
1710 | */ | |
8d280b98 DC |
1711 | switch (msbp->msb_field) { |
1712 | #ifdef HAVE_PERCPU_SB | |
1713 | case XFS_SBS_ICOUNT: | |
1714 | case XFS_SBS_IFREE: | |
1715 | case XFS_SBS_FDBLOCKS: | |
1716 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
20b64285 DC |
1717 | XFS_SB_UNLOCK(mp, s); |
1718 | status = xfs_icsb_modify_counters(mp, | |
8d280b98 DC |
1719 | msbp->msb_field, |
1720 | msbp->msb_delta, rsvd); | |
20b64285 | 1721 | s = XFS_SB_LOCK(mp); |
8d280b98 DC |
1722 | break; |
1723 | } | |
1724 | /* FALLTHROUGH */ | |
1725 | #endif | |
1726 | default: | |
1727 | status = xfs_mod_incore_sb_unlocked(mp, | |
1728 | msbp->msb_field, | |
1729 | msbp->msb_delta, rsvd); | |
1730 | break; | |
1731 | } | |
1732 | ||
1da177e4 LT |
1733 | if (status != 0) { |
1734 | break; | |
1735 | } | |
1736 | } | |
1737 | ||
1738 | /* | |
1739 | * If we didn't complete the loop above, then back out | |
1740 | * any changes made to the superblock. If you add code | |
1741 | * between the loop above and here, make sure that you | |
1742 | * preserve the value of status. Loop back until | |
1743 | * we step below the beginning of the array. Make sure | |
1744 | * we don't touch anything back there. | |
1745 | */ | |
1746 | if (status != 0) { | |
1747 | msbp--; | |
1748 | while (msbp >= msb) { | |
8d280b98 DC |
1749 | switch (msbp->msb_field) { |
1750 | #ifdef HAVE_PERCPU_SB | |
1751 | case XFS_SBS_ICOUNT: | |
1752 | case XFS_SBS_IFREE: | |
1753 | case XFS_SBS_FDBLOCKS: | |
1754 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
20b64285 DC |
1755 | XFS_SB_UNLOCK(mp, s); |
1756 | status = xfs_icsb_modify_counters(mp, | |
8d280b98 DC |
1757 | msbp->msb_field, |
1758 | -(msbp->msb_delta), | |
1759 | rsvd); | |
20b64285 | 1760 | s = XFS_SB_LOCK(mp); |
8d280b98 DC |
1761 | break; |
1762 | } | |
1763 | /* FALLTHROUGH */ | |
1764 | #endif | |
1765 | default: | |
1766 | status = xfs_mod_incore_sb_unlocked(mp, | |
1767 | msbp->msb_field, | |
1768 | -(msbp->msb_delta), | |
1769 | rsvd); | |
1770 | break; | |
1771 | } | |
1da177e4 LT |
1772 | ASSERT(status == 0); |
1773 | msbp--; | |
1774 | } | |
1775 | } | |
1776 | XFS_SB_UNLOCK(mp, s); | |
014c2544 | 1777 | return status; |
1da177e4 LT |
1778 | } |
1779 | ||
1780 | /* | |
1781 | * xfs_getsb() is called to obtain the buffer for the superblock. | |
1782 | * The buffer is returned locked and read in from disk. | |
1783 | * The buffer should be released with a call to xfs_brelse(). | |
1784 | * | |
1785 | * If the flags parameter is BUF_TRYLOCK, then we'll only return | |
1786 | * the superblock buffer if it can be locked without sleeping. | |
1787 | * If it can't then we'll return NULL. | |
1788 | */ | |
1789 | xfs_buf_t * | |
1790 | xfs_getsb( | |
1791 | xfs_mount_t *mp, | |
1792 | int flags) | |
1793 | { | |
1794 | xfs_buf_t *bp; | |
1795 | ||
1796 | ASSERT(mp->m_sb_bp != NULL); | |
1797 | bp = mp->m_sb_bp; | |
1798 | if (flags & XFS_BUF_TRYLOCK) { | |
1799 | if (!XFS_BUF_CPSEMA(bp)) { | |
1800 | return NULL; | |
1801 | } | |
1802 | } else { | |
1803 | XFS_BUF_PSEMA(bp, PRIBIO); | |
1804 | } | |
1805 | XFS_BUF_HOLD(bp); | |
1806 | ASSERT(XFS_BUF_ISDONE(bp)); | |
014c2544 | 1807 | return bp; |
1da177e4 LT |
1808 | } |
1809 | ||
1810 | /* | |
1811 | * Used to free the superblock along various error paths. | |
1812 | */ | |
1813 | void | |
1814 | xfs_freesb( | |
1815 | xfs_mount_t *mp) | |
1816 | { | |
1817 | xfs_buf_t *bp; | |
1818 | ||
1819 | /* | |
1820 | * Use xfs_getsb() so that the buffer will be locked | |
1821 | * when we call xfs_buf_relse(). | |
1822 | */ | |
1823 | bp = xfs_getsb(mp, 0); | |
1824 | XFS_BUF_UNMANAGE(bp); | |
1825 | xfs_buf_relse(bp); | |
1826 | mp->m_sb_bp = NULL; | |
1827 | } | |
1828 | ||
1829 | /* | |
1830 | * See if the UUID is unique among mounted XFS filesystems. | |
1831 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. | |
1832 | */ | |
1833 | STATIC int | |
1834 | xfs_uuid_mount( | |
1835 | xfs_mount_t *mp) | |
1836 | { | |
1837 | if (uuid_is_nil(&mp->m_sb.sb_uuid)) { | |
1838 | cmn_err(CE_WARN, | |
1839 | "XFS: Filesystem %s has nil UUID - can't mount", | |
1840 | mp->m_fsname); | |
1841 | return -1; | |
1842 | } | |
1843 | if (!uuid_table_insert(&mp->m_sb.sb_uuid)) { | |
1844 | cmn_err(CE_WARN, | |
1845 | "XFS: Filesystem %s has duplicate UUID - can't mount", | |
1846 | mp->m_fsname); | |
1847 | return -1; | |
1848 | } | |
1849 | return 0; | |
1850 | } | |
1851 | ||
1852 | /* | |
1853 | * Remove filesystem from the UUID table. | |
1854 | */ | |
1855 | STATIC void | |
1856 | xfs_uuid_unmount( | |
1857 | xfs_mount_t *mp) | |
1858 | { | |
1859 | uuid_table_remove(&mp->m_sb.sb_uuid); | |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * Used to log changes to the superblock unit and width fields which could | |
1864 | * be altered by the mount options. Only the first superblock is updated. | |
1865 | */ | |
1866 | STATIC void | |
1867 | xfs_mount_log_sbunit( | |
1868 | xfs_mount_t *mp, | |
1869 | __int64_t fields) | |
1870 | { | |
1871 | xfs_trans_t *tp; | |
1872 | ||
1873 | ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID)); | |
1874 | ||
1875 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); | |
1876 | if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1877 | XFS_DEFAULT_LOG_COUNT)) { | |
1878 | xfs_trans_cancel(tp, 0); | |
1879 | return; | |
1880 | } | |
1881 | xfs_mod_sb(tp, fields); | |
1c72bf90 | 1882 | xfs_trans_commit(tp, 0); |
1da177e4 | 1883 | } |
8d280b98 DC |
1884 | |
1885 | ||
1886 | #ifdef HAVE_PERCPU_SB | |
1887 | /* | |
1888 | * Per-cpu incore superblock counters | |
1889 | * | |
1890 | * Simple concept, difficult implementation | |
1891 | * | |
1892 | * Basically, replace the incore superblock counters with a distributed per cpu | |
1893 | * counter for contended fields (e.g. free block count). | |
1894 | * | |
1895 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and | |
1896 | * hence needs to be accurately read when we are running low on space. Hence | |
1897 | * there is a method to enable and disable the per-cpu counters based on how | |
1898 | * much "stuff" is available in them. | |
1899 | * | |
1900 | * Basically, a counter is enabled if there is enough free resource to justify | |
1901 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local | |
1902 | * ENOSPC), then we disable the counters to synchronise all callers and | |
1903 | * re-distribute the available resources. | |
1904 | * | |
1905 | * If, once we redistributed the available resources, we still get a failure, | |
1906 | * we disable the per-cpu counter and go through the slow path. | |
1907 | * | |
1908 | * The slow path is the current xfs_mod_incore_sb() function. This means that | |
1909 | * when we disable a per-cpu counter, we need to drain it's resources back to | |
1910 | * the global superblock. We do this after disabling the counter to prevent | |
1911 | * more threads from queueing up on the counter. | |
1912 | * | |
1913 | * Essentially, this means that we still need a lock in the fast path to enable | |
1914 | * synchronisation between the global counters and the per-cpu counters. This | |
1915 | * is not a problem because the lock will be local to a CPU almost all the time | |
1916 | * and have little contention except when we get to ENOSPC conditions. | |
1917 | * | |
1918 | * Basically, this lock becomes a barrier that enables us to lock out the fast | |
1919 | * path while we do things like enabling and disabling counters and | |
1920 | * synchronising the counters. | |
1921 | * | |
1922 | * Locking rules: | |
1923 | * | |
1924 | * 1. XFS_SB_LOCK() before picking up per-cpu locks | |
1925 | * 2. per-cpu locks always picked up via for_each_online_cpu() order | |
1926 | * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks | |
1927 | * 4. modifying per-cpu counters requires holding per-cpu lock | |
1928 | * 5. modifying global counters requires holding XFS_SB_LOCK | |
1929 | * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK | |
1930 | * and _none_ of the per-cpu locks. | |
1931 | * | |
1932 | * Disabled counters are only ever re-enabled by a balance operation | |
1933 | * that results in more free resources per CPU than a given threshold. | |
1934 | * To ensure counters don't remain disabled, they are rebalanced when | |
1935 | * the global resource goes above a higher threshold (i.e. some hysteresis | |
1936 | * is present to prevent thrashing). | |
e8234a68 DC |
1937 | */ |
1938 | ||
5a67e4c5 | 1939 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1940 | /* |
1941 | * hot-plug CPU notifier support. | |
8d280b98 | 1942 | * |
5a67e4c5 CS |
1943 | * We need a notifier per filesystem as we need to be able to identify |
1944 | * the filesystem to balance the counters out. This is achieved by | |
1945 | * having a notifier block embedded in the xfs_mount_t and doing pointer | |
1946 | * magic to get the mount pointer from the notifier block address. | |
8d280b98 | 1947 | */ |
e8234a68 DC |
1948 | STATIC int |
1949 | xfs_icsb_cpu_notify( | |
1950 | struct notifier_block *nfb, | |
1951 | unsigned long action, | |
1952 | void *hcpu) | |
1953 | { | |
1954 | xfs_icsb_cnts_t *cntp; | |
1955 | xfs_mount_t *mp; | |
1956 | int s; | |
1957 | ||
1958 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); | |
1959 | cntp = (xfs_icsb_cnts_t *) | |
1960 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); | |
1961 | switch (action) { | |
1962 | case CPU_UP_PREPARE: | |
8bb78442 | 1963 | case CPU_UP_PREPARE_FROZEN: |
e8234a68 DC |
1964 | /* Easy Case - initialize the area and locks, and |
1965 | * then rebalance when online does everything else for us. */ | |
01e1b69c | 1966 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 DC |
1967 | break; |
1968 | case CPU_ONLINE: | |
8bb78442 | 1969 | case CPU_ONLINE_FROZEN: |
03135cf7 | 1970 | xfs_icsb_lock(mp); |
20b64285 DC |
1971 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); |
1972 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
1973 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
03135cf7 | 1974 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1975 | break; |
1976 | case CPU_DEAD: | |
8bb78442 | 1977 | case CPU_DEAD_FROZEN: |
e8234a68 DC |
1978 | /* Disable all the counters, then fold the dead cpu's |
1979 | * count into the total on the global superblock and | |
1980 | * re-enable the counters. */ | |
03135cf7 | 1981 | xfs_icsb_lock(mp); |
e8234a68 DC |
1982 | s = XFS_SB_LOCK(mp); |
1983 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); | |
1984 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); | |
1985 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); | |
1986 | ||
1987 | mp->m_sb.sb_icount += cntp->icsb_icount; | |
1988 | mp->m_sb.sb_ifree += cntp->icsb_ifree; | |
1989 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; | |
1990 | ||
01e1b69c | 1991 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 | 1992 | |
20b64285 DC |
1993 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, |
1994 | XFS_ICSB_SB_LOCKED, 0); | |
1995 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, | |
1996 | XFS_ICSB_SB_LOCKED, 0); | |
1997 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, | |
1998 | XFS_ICSB_SB_LOCKED, 0); | |
e8234a68 | 1999 | XFS_SB_UNLOCK(mp, s); |
03135cf7 | 2000 | xfs_icsb_unlock(mp); |
e8234a68 DC |
2001 | break; |
2002 | } | |
2003 | ||
2004 | return NOTIFY_OK; | |
2005 | } | |
5a67e4c5 | 2006 | #endif /* CONFIG_HOTPLUG_CPU */ |
e8234a68 | 2007 | |
8d280b98 DC |
2008 | int |
2009 | xfs_icsb_init_counters( | |
2010 | xfs_mount_t *mp) | |
2011 | { | |
2012 | xfs_icsb_cnts_t *cntp; | |
2013 | int i; | |
2014 | ||
2015 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); | |
2016 | if (mp->m_sb_cnts == NULL) | |
2017 | return -ENOMEM; | |
2018 | ||
5a67e4c5 | 2019 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
2020 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; |
2021 | mp->m_icsb_notifier.priority = 0; | |
5a67e4c5 CS |
2022 | register_hotcpu_notifier(&mp->m_icsb_notifier); |
2023 | #endif /* CONFIG_HOTPLUG_CPU */ | |
e8234a68 | 2024 | |
8d280b98 DC |
2025 | for_each_online_cpu(i) { |
2026 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2027 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
8d280b98 | 2028 | } |
20b64285 DC |
2029 | |
2030 | mutex_init(&mp->m_icsb_mutex); | |
2031 | ||
8d280b98 DC |
2032 | /* |
2033 | * start with all counters disabled so that the | |
2034 | * initial balance kicks us off correctly | |
2035 | */ | |
2036 | mp->m_icsb_counters = -1; | |
2037 | return 0; | |
2038 | } | |
2039 | ||
5478eead LM |
2040 | void |
2041 | xfs_icsb_reinit_counters( | |
2042 | xfs_mount_t *mp) | |
2043 | { | |
2044 | xfs_icsb_lock(mp); | |
2045 | /* | |
2046 | * start with all counters disabled so that the | |
2047 | * initial balance kicks us off correctly | |
2048 | */ | |
2049 | mp->m_icsb_counters = -1; | |
2050 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); | |
2051 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
2052 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
2053 | xfs_icsb_unlock(mp); | |
2054 | } | |
2055 | ||
8d280b98 DC |
2056 | STATIC void |
2057 | xfs_icsb_destroy_counters( | |
2058 | xfs_mount_t *mp) | |
2059 | { | |
e8234a68 | 2060 | if (mp->m_sb_cnts) { |
5a67e4c5 | 2061 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
8d280b98 | 2062 | free_percpu(mp->m_sb_cnts); |
e8234a68 | 2063 | } |
03135cf7 | 2064 | mutex_destroy(&mp->m_icsb_mutex); |
8d280b98 DC |
2065 | } |
2066 | ||
7989cb8e | 2067 | STATIC_INLINE void |
01e1b69c DC |
2068 | xfs_icsb_lock_cntr( |
2069 | xfs_icsb_cnts_t *icsbp) | |
2070 | { | |
2071 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { | |
2072 | ndelay(1000); | |
2073 | } | |
2074 | } | |
2075 | ||
7989cb8e | 2076 | STATIC_INLINE void |
01e1b69c DC |
2077 | xfs_icsb_unlock_cntr( |
2078 | xfs_icsb_cnts_t *icsbp) | |
2079 | { | |
2080 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); | |
2081 | } | |
2082 | ||
8d280b98 | 2083 | |
7989cb8e | 2084 | STATIC_INLINE void |
8d280b98 DC |
2085 | xfs_icsb_lock_all_counters( |
2086 | xfs_mount_t *mp) | |
2087 | { | |
2088 | xfs_icsb_cnts_t *cntp; | |
2089 | int i; | |
2090 | ||
2091 | for_each_online_cpu(i) { | |
2092 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2093 | xfs_icsb_lock_cntr(cntp); |
8d280b98 DC |
2094 | } |
2095 | } | |
2096 | ||
7989cb8e | 2097 | STATIC_INLINE void |
8d280b98 DC |
2098 | xfs_icsb_unlock_all_counters( |
2099 | xfs_mount_t *mp) | |
2100 | { | |
2101 | xfs_icsb_cnts_t *cntp; | |
2102 | int i; | |
2103 | ||
2104 | for_each_online_cpu(i) { | |
2105 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2106 | xfs_icsb_unlock_cntr(cntp); |
8d280b98 DC |
2107 | } |
2108 | } | |
2109 | ||
2110 | STATIC void | |
2111 | xfs_icsb_count( | |
2112 | xfs_mount_t *mp, | |
2113 | xfs_icsb_cnts_t *cnt, | |
2114 | int flags) | |
2115 | { | |
2116 | xfs_icsb_cnts_t *cntp; | |
2117 | int i; | |
2118 | ||
2119 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); | |
2120 | ||
2121 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2122 | xfs_icsb_lock_all_counters(mp); | |
2123 | ||
2124 | for_each_online_cpu(i) { | |
2125 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
2126 | cnt->icsb_icount += cntp->icsb_icount; | |
2127 | cnt->icsb_ifree += cntp->icsb_ifree; | |
2128 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; | |
2129 | } | |
2130 | ||
2131 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2132 | xfs_icsb_unlock_all_counters(mp); | |
2133 | } | |
2134 | ||
2135 | STATIC int | |
2136 | xfs_icsb_counter_disabled( | |
2137 | xfs_mount_t *mp, | |
2138 | xfs_sb_field_t field) | |
2139 | { | |
2140 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2141 | return test_bit(field, &mp->m_icsb_counters); | |
2142 | } | |
2143 | ||
2144 | STATIC int | |
2145 | xfs_icsb_disable_counter( | |
2146 | xfs_mount_t *mp, | |
2147 | xfs_sb_field_t field) | |
2148 | { | |
2149 | xfs_icsb_cnts_t cnt; | |
2150 | ||
2151 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2152 | ||
20b64285 DC |
2153 | /* |
2154 | * If we are already disabled, then there is nothing to do | |
2155 | * here. We check before locking all the counters to avoid | |
2156 | * the expensive lock operation when being called in the | |
2157 | * slow path and the counter is already disabled. This is | |
2158 | * safe because the only time we set or clear this state is under | |
2159 | * the m_icsb_mutex. | |
2160 | */ | |
2161 | if (xfs_icsb_counter_disabled(mp, field)) | |
2162 | return 0; | |
2163 | ||
8d280b98 DC |
2164 | xfs_icsb_lock_all_counters(mp); |
2165 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { | |
2166 | /* drain back to superblock */ | |
2167 | ||
2168 | xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT); | |
2169 | switch(field) { | |
2170 | case XFS_SBS_ICOUNT: | |
2171 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2172 | break; | |
2173 | case XFS_SBS_IFREE: | |
2174 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2175 | break; | |
2176 | case XFS_SBS_FDBLOCKS: | |
2177 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2178 | break; | |
2179 | default: | |
2180 | BUG(); | |
2181 | } | |
2182 | } | |
2183 | ||
2184 | xfs_icsb_unlock_all_counters(mp); | |
2185 | ||
2186 | return 0; | |
2187 | } | |
2188 | ||
2189 | STATIC void | |
2190 | xfs_icsb_enable_counter( | |
2191 | xfs_mount_t *mp, | |
2192 | xfs_sb_field_t field, | |
2193 | uint64_t count, | |
2194 | uint64_t resid) | |
2195 | { | |
2196 | xfs_icsb_cnts_t *cntp; | |
2197 | int i; | |
2198 | ||
2199 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2200 | ||
2201 | xfs_icsb_lock_all_counters(mp); | |
2202 | for_each_online_cpu(i) { | |
2203 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); | |
2204 | switch (field) { | |
2205 | case XFS_SBS_ICOUNT: | |
2206 | cntp->icsb_icount = count + resid; | |
2207 | break; | |
2208 | case XFS_SBS_IFREE: | |
2209 | cntp->icsb_ifree = count + resid; | |
2210 | break; | |
2211 | case XFS_SBS_FDBLOCKS: | |
2212 | cntp->icsb_fdblocks = count + resid; | |
2213 | break; | |
2214 | default: | |
2215 | BUG(); | |
2216 | break; | |
2217 | } | |
2218 | resid = 0; | |
2219 | } | |
2220 | clear_bit(field, &mp->m_icsb_counters); | |
2221 | xfs_icsb_unlock_all_counters(mp); | |
2222 | } | |
2223 | ||
dbcabad1 DC |
2224 | void |
2225 | xfs_icsb_sync_counters_flags( | |
8d280b98 DC |
2226 | xfs_mount_t *mp, |
2227 | int flags) | |
2228 | { | |
2229 | xfs_icsb_cnts_t cnt; | |
2230 | int s; | |
2231 | ||
2232 | /* Pass 1: lock all counters */ | |
2233 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
2234 | s = XFS_SB_LOCK(mp); | |
2235 | ||
2236 | xfs_icsb_count(mp, &cnt, flags); | |
2237 | ||
2238 | /* Step 3: update mp->m_sb fields */ | |
2239 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) | |
2240 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2241 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) | |
2242 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2243 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) | |
2244 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2245 | ||
2246 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
2247 | XFS_SB_UNLOCK(mp, s); | |
2248 | } | |
2249 | ||
2250 | /* | |
2251 | * Accurate update of per-cpu counters to incore superblock | |
2252 | */ | |
2253 | STATIC void | |
2254 | xfs_icsb_sync_counters( | |
2255 | xfs_mount_t *mp) | |
2256 | { | |
dbcabad1 | 2257 | xfs_icsb_sync_counters_flags(mp, 0); |
8d280b98 DC |
2258 | } |
2259 | ||
2260 | /* | |
2261 | * Balance and enable/disable counters as necessary. | |
2262 | * | |
20b64285 DC |
2263 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
2264 | * chosen to be the same number as single on disk allocation chunk per CPU, and | |
2265 | * free blocks is something far enough zero that we aren't going thrash when we | |
2266 | * get near ENOSPC. We also need to supply a minimum we require per cpu to | |
2267 | * prevent looping endlessly when xfs_alloc_space asks for more than will | |
2268 | * be distributed to a single CPU but each CPU has enough blocks to be | |
2269 | * reenabled. | |
2270 | * | |
2271 | * Note that we can be called when counters are already disabled. | |
2272 | * xfs_icsb_disable_counter() optimises the counter locking in this case to | |
2273 | * prevent locking every per-cpu counter needlessly. | |
8d280b98 | 2274 | */ |
20b64285 DC |
2275 | |
2276 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 | |
4be536de | 2277 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
20b64285 | 2278 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
8d280b98 DC |
2279 | STATIC void |
2280 | xfs_icsb_balance_counter( | |
2281 | xfs_mount_t *mp, | |
2282 | xfs_sb_field_t field, | |
20b64285 DC |
2283 | int flags, |
2284 | int min_per_cpu) | |
8d280b98 | 2285 | { |
6fdf8ccc | 2286 | uint64_t count, resid; |
8d280b98 DC |
2287 | int weight = num_online_cpus(); |
2288 | int s; | |
20b64285 | 2289 | uint64_t min = (uint64_t)min_per_cpu; |
8d280b98 DC |
2290 | |
2291 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
2292 | s = XFS_SB_LOCK(mp); | |
2293 | ||
2294 | /* disable counter and sync counter */ | |
2295 | xfs_icsb_disable_counter(mp, field); | |
2296 | ||
2297 | /* update counters - first CPU gets residual*/ | |
2298 | switch (field) { | |
2299 | case XFS_SBS_ICOUNT: | |
2300 | count = mp->m_sb.sb_icount; | |
2301 | resid = do_div(count, weight); | |
20b64285 | 2302 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2303 | goto out; |
2304 | break; | |
2305 | case XFS_SBS_IFREE: | |
2306 | count = mp->m_sb.sb_ifree; | |
2307 | resid = do_div(count, weight); | |
20b64285 | 2308 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2309 | goto out; |
2310 | break; | |
2311 | case XFS_SBS_FDBLOCKS: | |
2312 | count = mp->m_sb.sb_fdblocks; | |
2313 | resid = do_div(count, weight); | |
20b64285 | 2314 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
8d280b98 DC |
2315 | goto out; |
2316 | break; | |
2317 | default: | |
2318 | BUG(); | |
6fdf8ccc | 2319 | count = resid = 0; /* quiet, gcc */ |
8d280b98 DC |
2320 | break; |
2321 | } | |
2322 | ||
2323 | xfs_icsb_enable_counter(mp, field, count, resid); | |
2324 | out: | |
2325 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
2326 | XFS_SB_UNLOCK(mp, s); | |
2327 | } | |
2328 | ||
20b64285 DC |
2329 | int |
2330 | xfs_icsb_modify_counters( | |
8d280b98 DC |
2331 | xfs_mount_t *mp, |
2332 | xfs_sb_field_t field, | |
20f4ebf2 | 2333 | int64_t delta, |
20b64285 | 2334 | int rsvd) |
8d280b98 DC |
2335 | { |
2336 | xfs_icsb_cnts_t *icsbp; | |
2337 | long long lcounter; /* long counter for 64 bit fields */ | |
20b64285 | 2338 | int cpu, ret = 0, s; |
8d280b98 | 2339 | |
20b64285 | 2340 | might_sleep(); |
8d280b98 DC |
2341 | again: |
2342 | cpu = get_cpu(); | |
20b64285 DC |
2343 | icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu); |
2344 | ||
2345 | /* | |
2346 | * if the counter is disabled, go to slow path | |
2347 | */ | |
8d280b98 DC |
2348 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
2349 | goto slow_path; | |
20b64285 DC |
2350 | xfs_icsb_lock_cntr(icsbp); |
2351 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { | |
2352 | xfs_icsb_unlock_cntr(icsbp); | |
2353 | goto slow_path; | |
2354 | } | |
8d280b98 DC |
2355 | |
2356 | switch (field) { | |
2357 | case XFS_SBS_ICOUNT: | |
2358 | lcounter = icsbp->icsb_icount; | |
2359 | lcounter += delta; | |
2360 | if (unlikely(lcounter < 0)) | |
20b64285 | 2361 | goto balance_counter; |
8d280b98 DC |
2362 | icsbp->icsb_icount = lcounter; |
2363 | break; | |
2364 | ||
2365 | case XFS_SBS_IFREE: | |
2366 | lcounter = icsbp->icsb_ifree; | |
2367 | lcounter += delta; | |
2368 | if (unlikely(lcounter < 0)) | |
20b64285 | 2369 | goto balance_counter; |
8d280b98 DC |
2370 | icsbp->icsb_ifree = lcounter; |
2371 | break; | |
2372 | ||
2373 | case XFS_SBS_FDBLOCKS: | |
2374 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); | |
2375 | ||
4be536de | 2376 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2377 | lcounter += delta; |
2378 | if (unlikely(lcounter < 0)) | |
20b64285 | 2379 | goto balance_counter; |
4be536de | 2380 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2381 | break; |
2382 | default: | |
2383 | BUG(); | |
2384 | break; | |
2385 | } | |
01e1b69c | 2386 | xfs_icsb_unlock_cntr(icsbp); |
8d280b98 | 2387 | put_cpu(); |
8d280b98 DC |
2388 | return 0; |
2389 | ||
8d280b98 | 2390 | slow_path: |
8d280b98 DC |
2391 | put_cpu(); |
2392 | ||
20b64285 DC |
2393 | /* |
2394 | * serialise with a mutex so we don't burn lots of cpu on | |
2395 | * the superblock lock. We still need to hold the superblock | |
2396 | * lock, however, when we modify the global structures. | |
2397 | */ | |
03135cf7 | 2398 | xfs_icsb_lock(mp); |
20b64285 DC |
2399 | |
2400 | /* | |
2401 | * Now running atomically. | |
2402 | * | |
2403 | * If the counter is enabled, someone has beaten us to rebalancing. | |
2404 | * Drop the lock and try again in the fast path.... | |
2405 | */ | |
2406 | if (!(xfs_icsb_counter_disabled(mp, field))) { | |
03135cf7 | 2407 | xfs_icsb_unlock(mp); |
8d280b98 | 2408 | goto again; |
8d280b98 DC |
2409 | } |
2410 | ||
20b64285 DC |
2411 | /* |
2412 | * The counter is currently disabled. Because we are | |
2413 | * running atomically here, we know a rebalance cannot | |
2414 | * be in progress. Hence we can go straight to operating | |
2415 | * on the global superblock. We do not call xfs_mod_incore_sb() | |
2416 | * here even though we need to get the SB_LOCK. Doing so | |
2417 | * will cause us to re-enter this function and deadlock. | |
2418 | * Hence we get the SB_LOCK ourselves and then call | |
2419 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates | |
2420 | * directly on the global counters. | |
2421 | */ | |
2422 | s = XFS_SB_LOCK(mp); | |
8d280b98 | 2423 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
20b64285 | 2424 | XFS_SB_UNLOCK(mp, s); |
8d280b98 | 2425 | |
20b64285 DC |
2426 | /* |
2427 | * Now that we've modified the global superblock, we | |
2428 | * may be able to re-enable the distributed counters | |
2429 | * (e.g. lots of space just got freed). After that | |
2430 | * we are done. | |
2431 | */ | |
2432 | if (ret != ENOSPC) | |
2433 | xfs_icsb_balance_counter(mp, field, 0, 0); | |
03135cf7 | 2434 | xfs_icsb_unlock(mp); |
8d280b98 | 2435 | return ret; |
8d280b98 | 2436 | |
20b64285 DC |
2437 | balance_counter: |
2438 | xfs_icsb_unlock_cntr(icsbp); | |
2439 | put_cpu(); | |
8d280b98 | 2440 | |
20b64285 DC |
2441 | /* |
2442 | * We may have multiple threads here if multiple per-cpu | |
2443 | * counters run dry at the same time. This will mean we can | |
2444 | * do more balances than strictly necessary but it is not | |
2445 | * the common slowpath case. | |
2446 | */ | |
03135cf7 | 2447 | xfs_icsb_lock(mp); |
20b64285 DC |
2448 | |
2449 | /* | |
2450 | * running atomically. | |
2451 | * | |
2452 | * This will leave the counter in the correct state for future | |
2453 | * accesses. After the rebalance, we simply try again and our retry | |
2454 | * will either succeed through the fast path or slow path without | |
2455 | * another balance operation being required. | |
2456 | */ | |
2457 | xfs_icsb_balance_counter(mp, field, 0, delta); | |
03135cf7 | 2458 | xfs_icsb_unlock(mp); |
20b64285 | 2459 | goto again; |
8d280b98 | 2460 | } |
20b64285 | 2461 | |
8d280b98 | 2462 | #endif |