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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( | |
745f6919 | 160 | xfs_mount_t *mp) |
1da177e4 | 161 | { |
1da177e4 LT |
162 | if (mp->m_perag) { |
163 | int agno; | |
164 | ||
165 | for (agno = 0; agno < mp->m_maxagi; agno++) | |
166 | if (mp->m_perag[agno].pagb_list) | |
167 | kmem_free(mp->m_perag[agno].pagb_list, | |
168 | sizeof(xfs_perag_busy_t) * | |
169 | XFS_PAGB_NUM_SLOTS); | |
170 | kmem_free(mp->m_perag, | |
171 | sizeof(xfs_perag_t) * mp->m_sb.sb_agcount); | |
172 | } | |
173 | ||
174 | AIL_LOCK_DESTROY(&mp->m_ail_lock); | |
175 | spinlock_destroy(&mp->m_sb_lock); | |
176 | mutex_destroy(&mp->m_ilock); | |
177 | freesema(&mp->m_growlock); | |
178 | if (mp->m_quotainfo) | |
179 | XFS_QM_DONE(mp); | |
180 | ||
181 | if (mp->m_fsname != NULL) | |
182 | kmem_free(mp->m_fsname, mp->m_fsname_len); | |
fc1f8c1c NS |
183 | if (mp->m_rtname != NULL) |
184 | kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1); | |
185 | if (mp->m_logname != NULL) | |
186 | kmem_free(mp->m_logname, strlen(mp->m_logname) + 1); | |
1da177e4 | 187 | |
8d280b98 | 188 | xfs_icsb_destroy_counters(mp); |
1da177e4 LT |
189 | } |
190 | ||
4cc929ee NS |
191 | /* |
192 | * Check size of device based on the (data/realtime) block count. | |
193 | * Note: this check is used by the growfs code as well as mount. | |
194 | */ | |
195 | int | |
196 | xfs_sb_validate_fsb_count( | |
197 | xfs_sb_t *sbp, | |
198 | __uint64_t nblocks) | |
199 | { | |
200 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); | |
201 | ASSERT(sbp->sb_blocklog >= BBSHIFT); | |
202 | ||
203 | #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ | |
204 | if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) | |
205 | return E2BIG; | |
206 | #else /* Limited by UINT_MAX of sectors */ | |
207 | if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX) | |
208 | return E2BIG; | |
209 | #endif | |
210 | return 0; | |
211 | } | |
1da177e4 LT |
212 | |
213 | /* | |
214 | * Check the validity of the SB found. | |
215 | */ | |
216 | STATIC int | |
217 | xfs_mount_validate_sb( | |
218 | xfs_mount_t *mp, | |
764d1f89 NS |
219 | xfs_sb_t *sbp, |
220 | int flags) | |
1da177e4 LT |
221 | { |
222 | /* | |
223 | * If the log device and data device have the | |
224 | * same device number, the log is internal. | |
225 | * Consequently, the sb_logstart should be non-zero. If | |
226 | * we have a zero sb_logstart in this case, we may be trying to mount | |
227 | * a volume filesystem in a non-volume manner. | |
228 | */ | |
229 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { | |
764d1f89 | 230 | xfs_fs_mount_cmn_err(flags, "bad magic number"); |
1da177e4 LT |
231 | return XFS_ERROR(EWRONGFS); |
232 | } | |
233 | ||
234 | if (!XFS_SB_GOOD_VERSION(sbp)) { | |
764d1f89 | 235 | xfs_fs_mount_cmn_err(flags, "bad version"); |
1da177e4 LT |
236 | return XFS_ERROR(EWRONGFS); |
237 | } | |
238 | ||
239 | if (unlikely( | |
240 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { | |
764d1f89 NS |
241 | xfs_fs_mount_cmn_err(flags, |
242 | "filesystem is marked as having an external log; " | |
243 | "specify logdev on the\nmount command line."); | |
244 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
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 internal log; " | |
251 | "do not specify logdev on\nthe mount command line."); | |
252 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
253 | } |
254 | ||
255 | /* | |
256 | * More sanity checking. These were stolen directly from | |
257 | * xfs_repair. | |
258 | */ | |
259 | if (unlikely( | |
260 | sbp->sb_agcount <= 0 || | |
261 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
262 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
263 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
264 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
265 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || | |
266 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
267 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
268 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
269 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || | |
270 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
9f989c94 NS |
271 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || |
272 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
273 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || | |
1da177e4 LT |
274 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || |
275 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
e50bd16f | 276 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) { |
764d1f89 | 277 | xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed"); |
1da177e4 LT |
278 | return XFS_ERROR(EFSCORRUPTED); |
279 | } | |
280 | ||
281 | /* | |
282 | * Sanity check AG count, size fields against data size field | |
283 | */ | |
284 | if (unlikely( | |
285 | sbp->sb_dblocks == 0 || | |
286 | sbp->sb_dblocks > | |
287 | (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks || | |
288 | sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) * | |
289 | sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) { | |
764d1f89 | 290 | xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed"); |
1da177e4 LT |
291 | return XFS_ERROR(EFSCORRUPTED); |
292 | } | |
293 | ||
4cc929ee NS |
294 | if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || |
295 | xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { | |
764d1f89 NS |
296 | xfs_fs_mount_cmn_err(flags, |
297 | "file system too large to be mounted on this system."); | |
1da177e4 LT |
298 | return XFS_ERROR(E2BIG); |
299 | } | |
300 | ||
301 | if (unlikely(sbp->sb_inprogress)) { | |
764d1f89 | 302 | xfs_fs_mount_cmn_err(flags, "file system busy"); |
1da177e4 LT |
303 | return XFS_ERROR(EFSCORRUPTED); |
304 | } | |
305 | ||
de20614b NS |
306 | /* |
307 | * Version 1 directory format has never worked on Linux. | |
308 | */ | |
309 | if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) { | |
764d1f89 NS |
310 | xfs_fs_mount_cmn_err(flags, |
311 | "file system using version 1 directory format"); | |
de20614b NS |
312 | return XFS_ERROR(ENOSYS); |
313 | } | |
314 | ||
1da177e4 LT |
315 | /* |
316 | * Until this is fixed only page-sized or smaller data blocks work. | |
317 | */ | |
318 | if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { | |
764d1f89 NS |
319 | xfs_fs_mount_cmn_err(flags, |
320 | "file system with blocksize %d bytes", | |
1da177e4 | 321 | sbp->sb_blocksize); |
764d1f89 NS |
322 | xfs_fs_mount_cmn_err(flags, |
323 | "only pagesize (%ld) or less will currently work.", | |
1da177e4 LT |
324 | PAGE_SIZE); |
325 | return XFS_ERROR(ENOSYS); | |
326 | } | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
da353b0d DC |
331 | STATIC void |
332 | xfs_initialize_perag_icache( | |
333 | xfs_perag_t *pag) | |
334 | { | |
335 | if (!pag->pag_ici_init) { | |
336 | rwlock_init(&pag->pag_ici_lock); | |
337 | INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); | |
338 | pag->pag_ici_init = 1; | |
339 | } | |
340 | } | |
341 | ||
1da177e4 | 342 | xfs_agnumber_t |
c11e2c36 | 343 | xfs_initialize_perag( |
b83bd138 | 344 | bhv_vfs_t *vfs, |
c11e2c36 NS |
345 | xfs_mount_t *mp, |
346 | xfs_agnumber_t agcount) | |
1da177e4 LT |
347 | { |
348 | xfs_agnumber_t index, max_metadata; | |
349 | xfs_perag_t *pag; | |
350 | xfs_agino_t agino; | |
351 | xfs_ino_t ino; | |
352 | xfs_sb_t *sbp = &mp->m_sb; | |
353 | xfs_ino_t max_inum = XFS_MAXINUMBER_32; | |
354 | ||
355 | /* Check to see if the filesystem can overflow 32 bit inodes */ | |
356 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); | |
357 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); | |
358 | ||
359 | /* Clear the mount flag if no inode can overflow 32 bits | |
360 | * on this filesystem, or if specifically requested.. | |
361 | */ | |
bd186aa9 | 362 | if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > max_inum) { |
1da177e4 LT |
363 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
364 | } else { | |
365 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; | |
366 | } | |
367 | ||
368 | /* If we can overflow then setup the ag headers accordingly */ | |
369 | if (mp->m_flags & XFS_MOUNT_32BITINODES) { | |
370 | /* Calculate how much should be reserved for inodes to | |
371 | * meet the max inode percentage. | |
372 | */ | |
373 | if (mp->m_maxicount) { | |
374 | __uint64_t icount; | |
375 | ||
376 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
377 | do_div(icount, 100); | |
378 | icount += sbp->sb_agblocks - 1; | |
a749ee86 | 379 | do_div(icount, sbp->sb_agblocks); |
1da177e4 LT |
380 | max_metadata = icount; |
381 | } else { | |
382 | max_metadata = agcount; | |
383 | } | |
384 | for (index = 0; index < agcount; index++) { | |
385 | ino = XFS_AGINO_TO_INO(mp, index, agino); | |
386 | if (ino > max_inum) { | |
387 | index++; | |
388 | break; | |
389 | } | |
390 | ||
c41564b5 | 391 | /* This ag is preferred for inodes */ |
1da177e4 LT |
392 | pag = &mp->m_perag[index]; |
393 | pag->pagi_inodeok = 1; | |
394 | if (index < max_metadata) | |
395 | pag->pagf_metadata = 1; | |
da353b0d | 396 | xfs_initialize_perag_icache(pag); |
1da177e4 LT |
397 | } |
398 | } else { | |
399 | /* Setup default behavior for smaller filesystems */ | |
400 | for (index = 0; index < agcount; index++) { | |
401 | pag = &mp->m_perag[index]; | |
402 | pag->pagi_inodeok = 1; | |
da353b0d | 403 | xfs_initialize_perag_icache(pag); |
1da177e4 LT |
404 | } |
405 | } | |
406 | return index; | |
407 | } | |
408 | ||
2bdf7cd0 CH |
409 | void |
410 | xfs_sb_from_disk( | |
411 | xfs_sb_t *to, | |
412 | xfs_dsb_t *from) | |
413 | { | |
414 | to->sb_magicnum = be32_to_cpu(from->sb_magicnum); | |
415 | to->sb_blocksize = be32_to_cpu(from->sb_blocksize); | |
416 | to->sb_dblocks = be64_to_cpu(from->sb_dblocks); | |
417 | to->sb_rblocks = be64_to_cpu(from->sb_rblocks); | |
418 | to->sb_rextents = be64_to_cpu(from->sb_rextents); | |
419 | memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); | |
420 | to->sb_logstart = be64_to_cpu(from->sb_logstart); | |
421 | to->sb_rootino = be64_to_cpu(from->sb_rootino); | |
422 | to->sb_rbmino = be64_to_cpu(from->sb_rbmino); | |
423 | to->sb_rsumino = be64_to_cpu(from->sb_rsumino); | |
424 | to->sb_rextsize = be32_to_cpu(from->sb_rextsize); | |
425 | to->sb_agblocks = be32_to_cpu(from->sb_agblocks); | |
426 | to->sb_agcount = be32_to_cpu(from->sb_agcount); | |
427 | to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); | |
428 | to->sb_logblocks = be32_to_cpu(from->sb_logblocks); | |
429 | to->sb_versionnum = be16_to_cpu(from->sb_versionnum); | |
430 | to->sb_sectsize = be16_to_cpu(from->sb_sectsize); | |
431 | to->sb_inodesize = be16_to_cpu(from->sb_inodesize); | |
432 | to->sb_inopblock = be16_to_cpu(from->sb_inopblock); | |
433 | memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); | |
434 | to->sb_blocklog = from->sb_blocklog; | |
435 | to->sb_sectlog = from->sb_sectlog; | |
436 | to->sb_inodelog = from->sb_inodelog; | |
437 | to->sb_inopblog = from->sb_inopblog; | |
438 | to->sb_agblklog = from->sb_agblklog; | |
439 | to->sb_rextslog = from->sb_rextslog; | |
440 | to->sb_inprogress = from->sb_inprogress; | |
441 | to->sb_imax_pct = from->sb_imax_pct; | |
442 | to->sb_icount = be64_to_cpu(from->sb_icount); | |
443 | to->sb_ifree = be64_to_cpu(from->sb_ifree); | |
444 | to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); | |
445 | to->sb_frextents = be64_to_cpu(from->sb_frextents); | |
446 | to->sb_uquotino = be64_to_cpu(from->sb_uquotino); | |
447 | to->sb_gquotino = be64_to_cpu(from->sb_gquotino); | |
448 | to->sb_qflags = be16_to_cpu(from->sb_qflags); | |
449 | to->sb_flags = from->sb_flags; | |
450 | to->sb_shared_vn = from->sb_shared_vn; | |
451 | to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); | |
452 | to->sb_unit = be32_to_cpu(from->sb_unit); | |
453 | to->sb_width = be32_to_cpu(from->sb_width); | |
454 | to->sb_dirblklog = from->sb_dirblklog; | |
455 | to->sb_logsectlog = from->sb_logsectlog; | |
456 | to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); | |
457 | to->sb_logsunit = be32_to_cpu(from->sb_logsunit); | |
458 | to->sb_features2 = be32_to_cpu(from->sb_features2); | |
459 | } | |
460 | ||
1da177e4 | 461 | /* |
2bdf7cd0 | 462 | * Copy in core superblock to ondisk one. |
1da177e4 | 463 | * |
2bdf7cd0 | 464 | * The fields argument is mask of superblock fields to copy. |
1da177e4 LT |
465 | */ |
466 | void | |
2bdf7cd0 CH |
467 | xfs_sb_to_disk( |
468 | xfs_dsb_t *to, | |
469 | xfs_sb_t *from, | |
1da177e4 LT |
470 | __int64_t fields) |
471 | { | |
2bdf7cd0 CH |
472 | xfs_caddr_t to_ptr = (xfs_caddr_t)to; |
473 | xfs_caddr_t from_ptr = (xfs_caddr_t)from; | |
1da177e4 LT |
474 | xfs_sb_field_t f; |
475 | int first; | |
476 | int size; | |
477 | ||
1da177e4 | 478 | ASSERT(fields); |
1da177e4 LT |
479 | if (!fields) |
480 | return; | |
481 | ||
1da177e4 LT |
482 | while (fields) { |
483 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
484 | first = xfs_sb_info[f].offset; | |
485 | size = xfs_sb_info[f + 1].offset - first; | |
486 | ||
487 | ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); | |
488 | ||
489 | if (size == 1 || xfs_sb_info[f].type == 1) { | |
2bdf7cd0 | 490 | memcpy(to_ptr + first, from_ptr + first, size); |
1da177e4 LT |
491 | } else { |
492 | switch (size) { | |
493 | case 2: | |
2bdf7cd0 CH |
494 | *(__be16 *)(to_ptr + first) = |
495 | cpu_to_be16(*(__u16 *)(from_ptr + first)); | |
1da177e4 LT |
496 | break; |
497 | case 4: | |
2bdf7cd0 CH |
498 | *(__be32 *)(to_ptr + first) = |
499 | cpu_to_be32(*(__u32 *)(from_ptr + first)); | |
1da177e4 LT |
500 | break; |
501 | case 8: | |
2bdf7cd0 CH |
502 | *(__be64 *)(to_ptr + first) = |
503 | cpu_to_be64(*(__u64 *)(from_ptr + first)); | |
1da177e4 LT |
504 | break; |
505 | default: | |
506 | ASSERT(0); | |
507 | } | |
508 | } | |
509 | ||
510 | fields &= ~(1LL << f); | |
511 | } | |
512 | } | |
513 | ||
514 | /* | |
515 | * xfs_readsb | |
516 | * | |
517 | * Does the initial read of the superblock. | |
518 | */ | |
519 | int | |
764d1f89 | 520 | xfs_readsb(xfs_mount_t *mp, int flags) |
1da177e4 LT |
521 | { |
522 | unsigned int sector_size; | |
523 | unsigned int extra_flags; | |
524 | xfs_buf_t *bp; | |
1da177e4 LT |
525 | int error; |
526 | ||
527 | ASSERT(mp->m_sb_bp == NULL); | |
528 | ASSERT(mp->m_ddev_targp != NULL); | |
529 | ||
530 | /* | |
531 | * Allocate a (locked) buffer to hold the superblock. | |
532 | * This will be kept around at all times to optimize | |
533 | * access to the superblock. | |
534 | */ | |
535 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); | |
536 | extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED; | |
537 | ||
538 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
539 | BTOBB(sector_size), extra_flags); | |
540 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 541 | xfs_fs_mount_cmn_err(flags, "SB read failed"); |
1da177e4 LT |
542 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
543 | goto fail; | |
544 | } | |
545 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
546 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
547 | ||
548 | /* | |
549 | * Initialize the mount structure from the superblock. | |
550 | * But first do some basic consistency checking. | |
551 | */ | |
2bdf7cd0 | 552 | xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp)); |
1da177e4 | 553 | |
764d1f89 | 554 | error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags); |
1da177e4 | 555 | if (error) { |
764d1f89 | 556 | xfs_fs_mount_cmn_err(flags, "SB validate failed"); |
1da177e4 LT |
557 | goto fail; |
558 | } | |
559 | ||
560 | /* | |
561 | * We must be able to do sector-sized and sector-aligned IO. | |
562 | */ | |
563 | if (sector_size > mp->m_sb.sb_sectsize) { | |
764d1f89 NS |
564 | xfs_fs_mount_cmn_err(flags, |
565 | "device supports only %u byte sectors (not %u)", | |
1da177e4 LT |
566 | sector_size, mp->m_sb.sb_sectsize); |
567 | error = ENOSYS; | |
568 | goto fail; | |
569 | } | |
570 | ||
571 | /* | |
572 | * If device sector size is smaller than the superblock size, | |
573 | * re-read the superblock so the buffer is correctly sized. | |
574 | */ | |
575 | if (sector_size < mp->m_sb.sb_sectsize) { | |
576 | XFS_BUF_UNMANAGE(bp); | |
577 | xfs_buf_relse(bp); | |
578 | sector_size = mp->m_sb.sb_sectsize; | |
579 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
580 | BTOBB(sector_size), extra_flags); | |
581 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 582 | xfs_fs_mount_cmn_err(flags, "SB re-read failed"); |
1da177e4 LT |
583 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
584 | goto fail; | |
585 | } | |
586 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
587 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
588 | } | |
589 | ||
5478eead LM |
590 | /* Initialize per-cpu counters */ |
591 | xfs_icsb_reinit_counters(mp); | |
8d280b98 | 592 | |
1da177e4 LT |
593 | mp->m_sb_bp = bp; |
594 | xfs_buf_relse(bp); | |
595 | ASSERT(XFS_BUF_VALUSEMA(bp) > 0); | |
596 | return 0; | |
597 | ||
598 | fail: | |
599 | if (bp) { | |
600 | XFS_BUF_UNMANAGE(bp); | |
601 | xfs_buf_relse(bp); | |
602 | } | |
603 | return error; | |
604 | } | |
605 | ||
606 | ||
607 | /* | |
608 | * xfs_mount_common | |
609 | * | |
610 | * Mount initialization code establishing various mount | |
611 | * fields from the superblock associated with the given | |
612 | * mount structure | |
613 | */ | |
ba0f32d4 | 614 | STATIC void |
1da177e4 LT |
615 | xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) |
616 | { | |
617 | int i; | |
618 | ||
619 | mp->m_agfrotor = mp->m_agirotor = 0; | |
620 | spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock"); | |
621 | mp->m_maxagi = mp->m_sb.sb_agcount; | |
622 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
623 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
624 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
625 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
626 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
627 | mp->m_litino = sbp->sb_inodesize - | |
628 | ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t)); | |
629 | mp->m_blockmask = sbp->sb_blocksize - 1; | |
630 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
631 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
632 | INIT_LIST_HEAD(&mp->m_del_inodes); | |
633 | ||
634 | /* | |
635 | * Setup for attributes, in case they get created. | |
636 | * This value is for inodes getting attributes for the first time, | |
637 | * the per-inode value is for old attribute values. | |
638 | */ | |
639 | ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048); | |
640 | switch (sbp->sb_inodesize) { | |
641 | case 256: | |
d8cc890d NS |
642 | mp->m_attroffset = XFS_LITINO(mp) - |
643 | XFS_BMDR_SPACE_CALC(MINABTPTRS); | |
1da177e4 LT |
644 | break; |
645 | case 512: | |
646 | case 1024: | |
647 | case 2048: | |
d8cc890d | 648 | mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS); |
1da177e4 LT |
649 | break; |
650 | default: | |
651 | ASSERT(0); | |
652 | } | |
653 | ASSERT(mp->m_attroffset < XFS_LITINO(mp)); | |
654 | ||
655 | for (i = 0; i < 2; i++) { | |
656 | mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
657 | xfs_alloc, i == 0); | |
658 | mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
659 | xfs_alloc, i == 0); | |
660 | } | |
661 | for (i = 0; i < 2; i++) { | |
662 | mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
663 | xfs_bmbt, i == 0); | |
664 | mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
665 | xfs_bmbt, i == 0); | |
666 | } | |
667 | for (i = 0; i < 2; i++) { | |
668 | mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
669 | xfs_inobt, i == 0); | |
670 | mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
671 | xfs_inobt, i == 0); | |
672 | } | |
673 | ||
674 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
675 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
676 | sbp->sb_inopblock); | |
677 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
678 | } | |
92821e2b DC |
679 | |
680 | /* | |
681 | * xfs_initialize_perag_data | |
682 | * | |
683 | * Read in each per-ag structure so we can count up the number of | |
684 | * allocated inodes, free inodes and used filesystem blocks as this | |
685 | * information is no longer persistent in the superblock. Once we have | |
686 | * this information, write it into the in-core superblock structure. | |
687 | */ | |
688 | STATIC int | |
689 | xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount) | |
690 | { | |
691 | xfs_agnumber_t index; | |
692 | xfs_perag_t *pag; | |
693 | xfs_sb_t *sbp = &mp->m_sb; | |
694 | uint64_t ifree = 0; | |
695 | uint64_t ialloc = 0; | |
696 | uint64_t bfree = 0; | |
697 | uint64_t bfreelst = 0; | |
698 | uint64_t btree = 0; | |
699 | int error; | |
700 | int s; | |
701 | ||
702 | for (index = 0; index < agcount; index++) { | |
703 | /* | |
704 | * read the agf, then the agi. This gets us | |
705 | * all the inforamtion we need and populates the | |
706 | * per-ag structures for us. | |
707 | */ | |
708 | error = xfs_alloc_pagf_init(mp, NULL, index, 0); | |
709 | if (error) | |
710 | return error; | |
711 | ||
712 | error = xfs_ialloc_pagi_init(mp, NULL, index); | |
713 | if (error) | |
714 | return error; | |
715 | pag = &mp->m_perag[index]; | |
716 | ifree += pag->pagi_freecount; | |
717 | ialloc += pag->pagi_count; | |
718 | bfree += pag->pagf_freeblks; | |
719 | bfreelst += pag->pagf_flcount; | |
720 | btree += pag->pagf_btreeblks; | |
721 | } | |
722 | /* | |
723 | * Overwrite incore superblock counters with just-read data | |
724 | */ | |
725 | s = XFS_SB_LOCK(mp); | |
726 | sbp->sb_ifree = ifree; | |
727 | sbp->sb_icount = ialloc; | |
728 | sbp->sb_fdblocks = bfree + bfreelst + btree; | |
729 | XFS_SB_UNLOCK(mp, s); | |
730 | ||
731 | /* Fixup the per-cpu counters as well. */ | |
732 | xfs_icsb_reinit_counters(mp); | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
1da177e4 LT |
737 | /* |
738 | * xfs_mountfs | |
739 | * | |
740 | * This function does the following on an initial mount of a file system: | |
741 | * - reads the superblock from disk and init the mount struct | |
742 | * - if we're a 32-bit kernel, do a size check on the superblock | |
743 | * so we don't mount terabyte filesystems | |
744 | * - init mount struct realtime fields | |
745 | * - allocate inode hash table for fs | |
746 | * - init directory manager | |
747 | * - perform recovery and init the log manager | |
748 | */ | |
749 | int | |
750 | xfs_mountfs( | |
b83bd138 | 751 | bhv_vfs_t *vfsp, |
1da177e4 LT |
752 | xfs_mount_t *mp, |
753 | int mfsi_flags) | |
754 | { | |
755 | xfs_buf_t *bp; | |
756 | xfs_sb_t *sbp = &(mp->m_sb); | |
757 | xfs_inode_t *rip; | |
67fcaa73 | 758 | bhv_vnode_t *rvp = NULL; |
1da177e4 LT |
759 | int readio_log, writeio_log; |
760 | xfs_daddr_t d; | |
84e1e99f | 761 | __uint64_t resblks; |
1da177e4 LT |
762 | __int64_t update_flags; |
763 | uint quotamount, quotaflags; | |
764 | int agno; | |
765 | int uuid_mounted = 0; | |
766 | int error = 0; | |
767 | ||
768 | if (mp->m_sb_bp == NULL) { | |
764d1f89 | 769 | if ((error = xfs_readsb(mp, mfsi_flags))) { |
014c2544 | 770 | return error; |
1da177e4 LT |
771 | } |
772 | } | |
773 | xfs_mount_common(mp, sbp); | |
774 | ||
775 | /* | |
776 | * Check if sb_agblocks is aligned at stripe boundary | |
777 | * If sb_agblocks is NOT aligned turn off m_dalign since | |
778 | * allocator alignment is within an ag, therefore ag has | |
779 | * to be aligned at stripe boundary. | |
780 | */ | |
781 | update_flags = 0LL; | |
782 | if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) { | |
783 | /* | |
784 | * If stripe unit and stripe width are not multiples | |
785 | * of the fs blocksize turn off alignment. | |
786 | */ | |
787 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || | |
788 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { | |
789 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
790 | cmn_err(CE_WARN, | |
791 | "XFS: alignment check 1 failed"); | |
792 | error = XFS_ERROR(EINVAL); | |
793 | goto error1; | |
794 | } | |
795 | mp->m_dalign = mp->m_swidth = 0; | |
796 | } else { | |
797 | /* | |
798 | * Convert the stripe unit and width to FSBs. | |
799 | */ | |
800 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); | |
801 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { | |
802 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
803 | error = XFS_ERROR(EINVAL); | |
804 | goto error1; | |
805 | } | |
806 | xfs_fs_cmn_err(CE_WARN, mp, | |
807 | "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)", | |
808 | mp->m_dalign, mp->m_swidth, | |
809 | sbp->sb_agblocks); | |
810 | ||
811 | mp->m_dalign = 0; | |
812 | mp->m_swidth = 0; | |
813 | } else if (mp->m_dalign) { | |
814 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); | |
815 | } else { | |
816 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
817 | xfs_fs_cmn_err(CE_WARN, mp, | |
818 | "stripe alignment turned off: sunit(%d) less than bsize(%d)", | |
819 | mp->m_dalign, | |
820 | mp->m_blockmask +1); | |
821 | error = XFS_ERROR(EINVAL); | |
822 | goto error1; | |
823 | } | |
824 | mp->m_swidth = 0; | |
825 | } | |
826 | } | |
827 | ||
828 | /* | |
829 | * Update superblock with new values | |
830 | * and log changes | |
831 | */ | |
832 | if (XFS_SB_VERSION_HASDALIGN(sbp)) { | |
833 | if (sbp->sb_unit != mp->m_dalign) { | |
834 | sbp->sb_unit = mp->m_dalign; | |
835 | update_flags |= XFS_SB_UNIT; | |
836 | } | |
837 | if (sbp->sb_width != mp->m_swidth) { | |
838 | sbp->sb_width = mp->m_swidth; | |
839 | update_flags |= XFS_SB_WIDTH; | |
840 | } | |
841 | } | |
842 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && | |
843 | XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) { | |
844 | mp->m_dalign = sbp->sb_unit; | |
845 | mp->m_swidth = sbp->sb_width; | |
846 | } | |
847 | ||
848 | xfs_alloc_compute_maxlevels(mp); | |
849 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); | |
850 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); | |
851 | xfs_ialloc_compute_maxlevels(mp); | |
852 | ||
853 | if (sbp->sb_imax_pct) { | |
854 | __uint64_t icount; | |
855 | ||
856 | /* Make sure the maximum inode count is a multiple of the | |
857 | * units we allocate inodes in. | |
858 | */ | |
859 | ||
860 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
861 | do_div(icount, 100); | |
862 | do_div(icount, mp->m_ialloc_blks); | |
863 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << | |
864 | sbp->sb_inopblog; | |
865 | } else | |
866 | mp->m_maxicount = 0; | |
867 | ||
868 | mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog); | |
869 | ||
870 | /* | |
871 | * XFS uses the uuid from the superblock as the unique | |
872 | * identifier for fsid. We can not use the uuid from the volume | |
873 | * since a single partition filesystem is identical to a single | |
874 | * partition volume/filesystem. | |
875 | */ | |
876 | if ((mfsi_flags & XFS_MFSI_SECOND) == 0 && | |
877 | (mp->m_flags & XFS_MOUNT_NOUUID) == 0) { | |
878 | if (xfs_uuid_mount(mp)) { | |
879 | error = XFS_ERROR(EINVAL); | |
880 | goto error1; | |
881 | } | |
882 | uuid_mounted=1; | |
1da177e4 LT |
883 | } |
884 | ||
885 | /* | |
886 | * Set the default minimum read and write sizes unless | |
887 | * already specified in a mount option. | |
888 | * We use smaller I/O sizes when the file system | |
889 | * is being used for NFS service (wsync mount option). | |
890 | */ | |
891 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { | |
892 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
893 | readio_log = XFS_WSYNC_READIO_LOG; | |
894 | writeio_log = XFS_WSYNC_WRITEIO_LOG; | |
895 | } else { | |
896 | readio_log = XFS_READIO_LOG_LARGE; | |
897 | writeio_log = XFS_WRITEIO_LOG_LARGE; | |
898 | } | |
899 | } else { | |
900 | readio_log = mp->m_readio_log; | |
901 | writeio_log = mp->m_writeio_log; | |
902 | } | |
903 | ||
1da177e4 LT |
904 | if (sbp->sb_blocklog > readio_log) { |
905 | mp->m_readio_log = sbp->sb_blocklog; | |
906 | } else { | |
907 | mp->m_readio_log = readio_log; | |
908 | } | |
909 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); | |
910 | if (sbp->sb_blocklog > writeio_log) { | |
911 | mp->m_writeio_log = sbp->sb_blocklog; | |
912 | } else { | |
913 | mp->m_writeio_log = writeio_log; | |
914 | } | |
915 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); | |
916 | ||
917 | /* | |
425f9ddd ES |
918 | * Set the inode cluster size. |
919 | * This may still be overridden by the file system | |
1da177e4 LT |
920 | * block size if it is larger than the chosen cluster size. |
921 | */ | |
425f9ddd ES |
922 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; |
923 | ||
1da177e4 LT |
924 | /* |
925 | * Set whether we're using inode alignment. | |
926 | */ | |
927 | if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) && | |
928 | mp->m_sb.sb_inoalignmt >= | |
929 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) | |
930 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; | |
931 | else | |
932 | mp->m_inoalign_mask = 0; | |
933 | /* | |
934 | * If we are using stripe alignment, check whether | |
935 | * the stripe unit is a multiple of the inode alignment | |
936 | */ | |
937 | if (mp->m_dalign && mp->m_inoalign_mask && | |
938 | !(mp->m_dalign & mp->m_inoalign_mask)) | |
939 | mp->m_sinoalign = mp->m_dalign; | |
940 | else | |
941 | mp->m_sinoalign = 0; | |
942 | /* | |
943 | * Check that the data (and log if separate) are an ok size. | |
944 | */ | |
945 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); | |
946 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { | |
947 | cmn_err(CE_WARN, "XFS: size check 1 failed"); | |
948 | error = XFS_ERROR(E2BIG); | |
949 | goto error1; | |
950 | } | |
951 | error = xfs_read_buf(mp, mp->m_ddev_targp, | |
952 | d - XFS_FSS_TO_BB(mp, 1), | |
953 | XFS_FSS_TO_BB(mp, 1), 0, &bp); | |
954 | if (!error) { | |
955 | xfs_buf_relse(bp); | |
956 | } else { | |
957 | cmn_err(CE_WARN, "XFS: size check 2 failed"); | |
958 | if (error == ENOSPC) { | |
959 | error = XFS_ERROR(E2BIG); | |
960 | } | |
961 | goto error1; | |
962 | } | |
963 | ||
964 | if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) && | |
965 | mp->m_logdev_targp != mp->m_ddev_targp) { | |
966 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); | |
967 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { | |
968 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
969 | error = XFS_ERROR(E2BIG); | |
970 | goto error1; | |
971 | } | |
972 | error = xfs_read_buf(mp, mp->m_logdev_targp, | |
973 | d - XFS_FSB_TO_BB(mp, 1), | |
974 | XFS_FSB_TO_BB(mp, 1), 0, &bp); | |
975 | if (!error) { | |
976 | xfs_buf_relse(bp); | |
977 | } else { | |
978 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
979 | if (error == ENOSPC) { | |
980 | error = XFS_ERROR(E2BIG); | |
981 | } | |
982 | goto error1; | |
983 | } | |
984 | } | |
985 | ||
986 | /* | |
987 | * Initialize realtime fields in the mount structure | |
988 | */ | |
989 | if ((error = xfs_rtmount_init(mp))) { | |
990 | cmn_err(CE_WARN, "XFS: RT mount failed"); | |
991 | goto error1; | |
992 | } | |
993 | ||
994 | /* | |
995 | * For client case we are done now | |
996 | */ | |
997 | if (mfsi_flags & XFS_MFSI_CLIENT) { | |
014c2544 | 998 | return 0; |
1da177e4 LT |
999 | } |
1000 | ||
1001 | /* | |
1002 | * Copies the low order bits of the timestamp and the randomly | |
1003 | * set "sequence" number out of a UUID. | |
1004 | */ | |
1005 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); | |
1006 | ||
1da177e4 LT |
1007 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ |
1008 | ||
f6c2d1fa | 1009 | xfs_dir_mount(mp); |
1da177e4 LT |
1010 | |
1011 | /* | |
1012 | * Initialize the attribute manager's entries. | |
1013 | */ | |
1014 | mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; | |
1015 | ||
1016 | /* | |
1017 | * Initialize the precomputed transaction reservations values. | |
1018 | */ | |
1019 | xfs_trans_init(mp); | |
1020 | ||
1da177e4 LT |
1021 | /* |
1022 | * Allocate and initialize the per-ag data. | |
1023 | */ | |
1024 | init_rwsem(&mp->m_peraglock); | |
1025 | mp->m_perag = | |
1026 | kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP); | |
1027 | ||
c11e2c36 | 1028 | mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount); |
1da177e4 LT |
1029 | |
1030 | /* | |
1031 | * log's mount-time initialization. Perform 1st part recovery if needed | |
1032 | */ | |
1033 | if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */ | |
1034 | error = xfs_log_mount(mp, mp->m_logdev_targp, | |
1035 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), | |
1036 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); | |
1037 | if (error) { | |
1038 | cmn_err(CE_WARN, "XFS: log mount failed"); | |
1039 | goto error2; | |
1040 | } | |
1041 | } else { /* No log has been defined */ | |
1042 | cmn_err(CE_WARN, "XFS: no log defined"); | |
1043 | XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp); | |
1044 | error = XFS_ERROR(EFSCORRUPTED); | |
1045 | goto error2; | |
1046 | } | |
1047 | ||
92821e2b DC |
1048 | /* |
1049 | * Now the log is mounted, we know if it was an unclean shutdown or | |
1050 | * not. If it was, with the first phase of recovery has completed, we | |
1051 | * have consistent AG blocks on disk. We have not recovered EFIs yet, | |
1052 | * but they are recovered transactionally in the second recovery phase | |
1053 | * later. | |
1054 | * | |
1055 | * Hence we can safely re-initialise incore superblock counters from | |
1056 | * the per-ag data. These may not be correct if the filesystem was not | |
1057 | * cleanly unmounted, so we need to wait for recovery to finish before | |
1058 | * doing this. | |
1059 | * | |
1060 | * If the filesystem was cleanly unmounted, then we can trust the | |
1061 | * values in the superblock to be correct and we don't need to do | |
1062 | * anything here. | |
1063 | * | |
1064 | * If we are currently making the filesystem, the initialisation will | |
1065 | * fail as the perag data is in an undefined state. | |
1066 | */ | |
1067 | ||
1068 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && | |
1069 | !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) && | |
1070 | !mp->m_sb.sb_inprogress) { | |
1071 | error = xfs_initialize_perag_data(mp, sbp->sb_agcount); | |
1072 | if (error) { | |
1073 | goto error2; | |
1074 | } | |
1075 | } | |
1da177e4 LT |
1076 | /* |
1077 | * Get and sanity-check the root inode. | |
1078 | * Save the pointer to it in the mount structure. | |
1079 | */ | |
1080 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0); | |
1081 | if (error) { | |
1082 | cmn_err(CE_WARN, "XFS: failed to read root inode"); | |
1083 | goto error3; | |
1084 | } | |
1085 | ||
1086 | ASSERT(rip != NULL); | |
1087 | rvp = XFS_ITOV(rip); | |
1088 | ||
1089 | if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) { | |
1090 | cmn_err(CE_WARN, "XFS: corrupted root inode"); | |
b6574520 NS |
1091 | cmn_err(CE_WARN, "Device %s - root %llu is not a directory", |
1092 | XFS_BUFTARG_NAME(mp->m_ddev_targp), | |
1093 | (unsigned long long)rip->i_ino); | |
1da177e4 LT |
1094 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
1095 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, | |
1096 | mp); | |
1097 | error = XFS_ERROR(EFSCORRUPTED); | |
1098 | goto error4; | |
1099 | } | |
1100 | mp->m_rootip = rip; /* save it */ | |
1101 | ||
1102 | xfs_iunlock(rip, XFS_ILOCK_EXCL); | |
1103 | ||
1104 | /* | |
1105 | * Initialize realtime inode pointers in the mount structure | |
1106 | */ | |
1107 | if ((error = xfs_rtmount_inodes(mp))) { | |
1108 | /* | |
1109 | * Free up the root inode. | |
1110 | */ | |
1111 | cmn_err(CE_WARN, "XFS: failed to read RT inodes"); | |
1112 | goto error4; | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * If fs is not mounted readonly, then update the superblock | |
1117 | * unit and width changes. | |
1118 | */ | |
bd186aa9 | 1119 | if (update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) |
1da177e4 LT |
1120 | xfs_mount_log_sbunit(mp, update_flags); |
1121 | ||
1122 | /* | |
1123 | * Initialise the XFS quota management subsystem for this mount | |
1124 | */ | |
1125 | if ((error = XFS_QM_INIT(mp, "amount, "aflags))) | |
1126 | goto error4; | |
1127 | ||
1128 | /* | |
1129 | * Finish recovering the file system. This part needed to be | |
1130 | * delayed until after the root and real-time bitmap inodes | |
1131 | * were consistently read in. | |
1132 | */ | |
1133 | error = xfs_log_mount_finish(mp, mfsi_flags); | |
1134 | if (error) { | |
1135 | cmn_err(CE_WARN, "XFS: log mount finish failed"); | |
1136 | goto error4; | |
1137 | } | |
1138 | ||
1139 | /* | |
1140 | * Complete the quota initialisation, post-log-replay component. | |
1141 | */ | |
1142 | if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags))) | |
1143 | goto error4; | |
1144 | ||
84e1e99f DC |
1145 | /* |
1146 | * Now we are mounted, reserve a small amount of unused space for | |
1147 | * privileged transactions. This is needed so that transaction | |
1148 | * space required for critical operations can dip into this pool | |
1149 | * when at ENOSPC. This is needed for operations like create with | |
1150 | * attr, unwritten extent conversion at ENOSPC, etc. Data allocations | |
1151 | * are not allowed to use this reserved space. | |
1152 | * | |
1153 | * We default to 5% or 1024 fsbs of space reserved, whichever is smaller. | |
1154 | * This may drive us straight to ENOSPC on mount, but that implies | |
1155 | * we were already there on the last unmount. | |
1156 | */ | |
39726be2 CH |
1157 | resblks = mp->m_sb.sb_dblocks; |
1158 | do_div(resblks, 20); | |
1159 | resblks = min_t(__uint64_t, resblks, 1024); | |
84e1e99f DC |
1160 | xfs_reserve_blocks(mp, &resblks, NULL); |
1161 | ||
1da177e4 LT |
1162 | return 0; |
1163 | ||
1164 | error4: | |
1165 | /* | |
1166 | * Free up the root inode. | |
1167 | */ | |
1168 | VN_RELE(rvp); | |
1169 | error3: | |
1170 | xfs_log_unmount_dealloc(mp); | |
1171 | error2: | |
1da177e4 LT |
1172 | for (agno = 0; agno < sbp->sb_agcount; agno++) |
1173 | if (mp->m_perag[agno].pagb_list) | |
1174 | kmem_free(mp->m_perag[agno].pagb_list, | |
1175 | sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS); | |
1176 | kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t)); | |
1177 | mp->m_perag = NULL; | |
1178 | /* FALLTHROUGH */ | |
1179 | error1: | |
1180 | if (uuid_mounted) | |
1181 | xfs_uuid_unmount(mp); | |
1182 | xfs_freesb(mp); | |
1183 | return error; | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * xfs_unmountfs | |
1188 | * | |
1189 | * This flushes out the inodes,dquots and the superblock, unmounts the | |
1190 | * log and makes sure that incore structures are freed. | |
1191 | */ | |
1192 | int | |
1193 | xfs_unmountfs(xfs_mount_t *mp, struct cred *cr) | |
1194 | { | |
b83bd138 | 1195 | struct bhv_vfs *vfsp = XFS_MTOVFS(mp); |
84e1e99f | 1196 | __uint64_t resblks; |
1da177e4 | 1197 | |
641c56fb DC |
1198 | /* |
1199 | * We can potentially deadlock here if we have an inode cluster | |
1200 | * that has been freed has it's buffer still pinned in memory because | |
1201 | * the transaction is still sitting in a iclog. The stale inodes | |
1202 | * on that buffer will have their flush locks held until the | |
1203 | * transaction hits the disk and the callbacks run. the inode | |
1204 | * flush takes the flush lock unconditionally and with nothing to | |
1205 | * push out the iclog we will never get that unlocked. hence we | |
1206 | * need to force the log first. | |
1207 | */ | |
1208 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
efa80278 | 1209 | xfs_iflush_all(mp); |
1da177e4 | 1210 | |
ee2a4f7c | 1211 | XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING); |
1da177e4 LT |
1212 | |
1213 | /* | |
1214 | * Flush out the log synchronously so that we know for sure | |
1215 | * that nothing is pinned. This is important because bflush() | |
1216 | * will skip pinned buffers. | |
1217 | */ | |
1218 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
1219 | ||
1220 | xfs_binval(mp->m_ddev_targp); | |
1221 | if (mp->m_rtdev_targp) { | |
1222 | xfs_binval(mp->m_rtdev_targp); | |
1223 | } | |
1224 | ||
84e1e99f DC |
1225 | /* |
1226 | * Unreserve any blocks we have so that when we unmount we don't account | |
1227 | * the reserved free space as used. This is really only necessary for | |
1228 | * lazy superblock counting because it trusts the incore superblock | |
1229 | * counters to be aboslutely correct on clean unmount. | |
1230 | * | |
1231 | * We don't bother correcting this elsewhere for lazy superblock | |
1232 | * counting because on mount of an unclean filesystem we reconstruct the | |
1233 | * correct counter value and this is irrelevant. | |
1234 | * | |
1235 | * For non-lazy counter filesystems, this doesn't matter at all because | |
1236 | * we only every apply deltas to the superblock and hence the incore | |
1237 | * value does not matter.... | |
1238 | */ | |
1239 | resblks = 0; | |
1240 | xfs_reserve_blocks(mp, &resblks, NULL); | |
1241 | ||
92821e2b | 1242 | xfs_log_sbcount(mp, 1); |
1da177e4 | 1243 | xfs_unmountfs_writesb(mp); |
1da177e4 | 1244 | xfs_unmountfs_wait(mp); /* wait for async bufs */ |
1da177e4 LT |
1245 | xfs_log_unmount(mp); /* Done! No more fs ops. */ |
1246 | ||
1247 | xfs_freesb(mp); | |
1248 | ||
1249 | /* | |
1250 | * All inodes from this mount point should be freed. | |
1251 | */ | |
1252 | ASSERT(mp->m_inodes == NULL); | |
1253 | ||
1da177e4 LT |
1254 | xfs_unmountfs_close(mp, cr); |
1255 | if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0) | |
1256 | xfs_uuid_unmount(mp); | |
1257 | ||
1258 | #if defined(DEBUG) || defined(INDUCE_IO_ERROR) | |
0ce4cfd4 | 1259 | xfs_errortag_clearall(mp, 0); |
1da177e4 LT |
1260 | #endif |
1261 | XFS_IODONE(vfsp); | |
745f6919 | 1262 | xfs_mount_free(mp); |
1da177e4 LT |
1263 | return 0; |
1264 | } | |
1265 | ||
1266 | void | |
1267 | xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr) | |
1268 | { | |
49ee6c91 | 1269 | if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) |
1da177e4 LT |
1270 | xfs_free_buftarg(mp->m_logdev_targp, 1); |
1271 | if (mp->m_rtdev_targp) | |
1272 | xfs_free_buftarg(mp->m_rtdev_targp, 1); | |
1273 | xfs_free_buftarg(mp->m_ddev_targp, 0); | |
1274 | } | |
1275 | ||
ba0f32d4 | 1276 | STATIC void |
1da177e4 LT |
1277 | xfs_unmountfs_wait(xfs_mount_t *mp) |
1278 | { | |
1279 | if (mp->m_logdev_targp != mp->m_ddev_targp) | |
1280 | xfs_wait_buftarg(mp->m_logdev_targp); | |
1281 | if (mp->m_rtdev_targp) | |
1282 | xfs_wait_buftarg(mp->m_rtdev_targp); | |
1283 | xfs_wait_buftarg(mp->m_ddev_targp); | |
1284 | } | |
1285 | ||
92821e2b DC |
1286 | int |
1287 | xfs_fs_writable(xfs_mount_t *mp) | |
1288 | { | |
1289 | bhv_vfs_t *vfsp = XFS_MTOVFS(mp); | |
1290 | ||
1291 | return !(vfs_test_for_freeze(vfsp) || XFS_FORCED_SHUTDOWN(mp) || | |
bd186aa9 | 1292 | (mp->m_flags & XFS_MOUNT_RDONLY)); |
92821e2b DC |
1293 | } |
1294 | ||
1295 | /* | |
1296 | * xfs_log_sbcount | |
1297 | * | |
1298 | * Called either periodically to keep the on disk superblock values | |
1299 | * roughly up to date or from unmount to make sure the values are | |
1300 | * correct on a clean unmount. | |
1301 | * | |
1302 | * Note this code can be called during the process of freezing, so | |
1303 | * we may need to use the transaction allocator which does not not | |
1304 | * block when the transaction subsystem is in its frozen state. | |
1305 | */ | |
1306 | int | |
1307 | xfs_log_sbcount( | |
1308 | xfs_mount_t *mp, | |
1309 | uint sync) | |
1310 | { | |
1311 | xfs_trans_t *tp; | |
1312 | int error; | |
1313 | ||
1314 | if (!xfs_fs_writable(mp)) | |
1315 | return 0; | |
1316 | ||
1317 | xfs_icsb_sync_counters(mp); | |
1318 | ||
1319 | /* | |
1320 | * we don't need to do this if we are updating the superblock | |
1321 | * counters on every modification. | |
1322 | */ | |
1323 | if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) | |
1324 | return 0; | |
1325 | ||
1326 | tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT); | |
1327 | error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1328 | XFS_DEFAULT_LOG_COUNT); | |
1329 | if (error) { | |
1330 | xfs_trans_cancel(tp, 0); | |
1331 | return error; | |
1332 | } | |
1333 | ||
1334 | xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS); | |
1335 | if (sync) | |
1336 | xfs_trans_set_sync(tp); | |
1337 | xfs_trans_commit(tp, 0); | |
1338 | ||
1339 | return 0; | |
1340 | } | |
1341 | ||
2bdf7cd0 CH |
1342 | STATIC void |
1343 | xfs_mark_shared_ro( | |
1344 | xfs_mount_t *mp, | |
1345 | xfs_buf_t *bp) | |
1346 | { | |
1347 | xfs_dsb_t *sb = XFS_BUF_TO_SBP(bp); | |
1348 | __uint16_t version; | |
1349 | ||
1350 | if (!(sb->sb_flags & XFS_SBF_READONLY)) | |
1351 | sb->sb_flags |= XFS_SBF_READONLY; | |
1352 | ||
1353 | version = be16_to_cpu(sb->sb_versionnum); | |
1354 | if ((version & XFS_SB_VERSION_NUMBITS) != XFS_SB_VERSION_4 || | |
1355 | !(version & XFS_SB_VERSION_SHAREDBIT)) | |
1356 | version |= XFS_SB_VERSION_SHAREDBIT; | |
1357 | sb->sb_versionnum = cpu_to_be16(version); | |
1358 | } | |
1359 | ||
1da177e4 LT |
1360 | int |
1361 | xfs_unmountfs_writesb(xfs_mount_t *mp) | |
1362 | { | |
1363 | xfs_buf_t *sbp; | |
1da177e4 LT |
1364 | int error = 0; |
1365 | ||
1366 | /* | |
1367 | * skip superblock write if fs is read-only, or | |
1368 | * if we are doing a forced umount. | |
1369 | */ | |
bd186aa9 | 1370 | if (!((mp->m_flags & XFS_MOUNT_RDONLY) || |
1da177e4 | 1371 | XFS_FORCED_SHUTDOWN(mp))) { |
8d280b98 | 1372 | |
92821e2b | 1373 | sbp = xfs_getsb(mp, 0); |
8d280b98 | 1374 | |
1da177e4 LT |
1375 | /* |
1376 | * mark shared-readonly if desired | |
1377 | */ | |
2bdf7cd0 CH |
1378 | if (mp->m_mk_sharedro) |
1379 | xfs_mark_shared_ro(mp, sbp); | |
92821e2b | 1380 | |
1da177e4 LT |
1381 | XFS_BUF_UNDONE(sbp); |
1382 | XFS_BUF_UNREAD(sbp); | |
1383 | XFS_BUF_UNDELAYWRITE(sbp); | |
1384 | XFS_BUF_WRITE(sbp); | |
1385 | XFS_BUF_UNASYNC(sbp); | |
1386 | ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp); | |
1387 | xfsbdstrat(mp, sbp); | |
1388 | /* Nevermind errors we might get here. */ | |
1389 | error = xfs_iowait(sbp); | |
1390 | if (error) | |
1391 | xfs_ioerror_alert("xfs_unmountfs_writesb", | |
1392 | mp, sbp, XFS_BUF_ADDR(sbp)); | |
1393 | if (error && mp->m_mk_sharedro) | |
1394 | xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly"); | |
92821e2b | 1395 | xfs_buf_relse(sbp); |
1da177e4 | 1396 | } |
014c2544 | 1397 | return error; |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | /* | |
1401 | * xfs_mod_sb() can be used to copy arbitrary changes to the | |
1402 | * in-core superblock into the superblock buffer to be logged. | |
1403 | * It does not provide the higher level of locking that is | |
1404 | * needed to protect the in-core superblock from concurrent | |
1405 | * access. | |
1406 | */ | |
1407 | void | |
1408 | xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) | |
1409 | { | |
1410 | xfs_buf_t *bp; | |
1411 | int first; | |
1412 | int last; | |
1413 | xfs_mount_t *mp; | |
1da177e4 LT |
1414 | xfs_sb_field_t f; |
1415 | ||
1416 | ASSERT(fields); | |
1417 | if (!fields) | |
1418 | return; | |
1419 | mp = tp->t_mountp; | |
1420 | bp = xfs_trans_getsb(tp, mp, 0); | |
1da177e4 LT |
1421 | first = sizeof(xfs_sb_t); |
1422 | last = 0; | |
1423 | ||
1424 | /* translate/copy */ | |
1425 | ||
2bdf7cd0 | 1426 | xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields); |
1da177e4 LT |
1427 | |
1428 | /* find modified range */ | |
1429 | ||
1430 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
1431 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1432 | first = xfs_sb_info[f].offset; | |
1433 | ||
1434 | f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); | |
1435 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1436 | last = xfs_sb_info[f + 1].offset - 1; | |
1437 | ||
1438 | xfs_trans_log_buf(tp, bp, first, last); | |
1439 | } | |
d210a28c | 1440 | |
d210a28c | 1441 | |
1da177e4 LT |
1442 | /* |
1443 | * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply | |
1444 | * a delta to a specified field in the in-core superblock. Simply | |
1445 | * switch on the field indicated and apply the delta to that field. | |
1446 | * Fields are not allowed to dip below zero, so if the delta would | |
1447 | * do this do not apply it and return EINVAL. | |
1448 | * | |
1449 | * The SB_LOCK must be held when this routine is called. | |
1450 | */ | |
8d280b98 | 1451 | int |
20f4ebf2 DC |
1452 | xfs_mod_incore_sb_unlocked( |
1453 | xfs_mount_t *mp, | |
1454 | xfs_sb_field_t field, | |
1455 | int64_t delta, | |
1456 | int rsvd) | |
1da177e4 LT |
1457 | { |
1458 | int scounter; /* short counter for 32 bit fields */ | |
1459 | long long lcounter; /* long counter for 64 bit fields */ | |
1460 | long long res_used, rem; | |
1461 | ||
1462 | /* | |
1463 | * With the in-core superblock spin lock held, switch | |
1464 | * on the indicated field. Apply the delta to the | |
1465 | * proper field. If the fields value would dip below | |
1466 | * 0, then do not apply the delta and return EINVAL. | |
1467 | */ | |
1468 | switch (field) { | |
1469 | case XFS_SBS_ICOUNT: | |
1470 | lcounter = (long long)mp->m_sb.sb_icount; | |
1471 | lcounter += delta; | |
1472 | if (lcounter < 0) { | |
1473 | ASSERT(0); | |
014c2544 | 1474 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1475 | } |
1476 | mp->m_sb.sb_icount = lcounter; | |
014c2544 | 1477 | return 0; |
1da177e4 LT |
1478 | case XFS_SBS_IFREE: |
1479 | lcounter = (long long)mp->m_sb.sb_ifree; | |
1480 | lcounter += delta; | |
1481 | if (lcounter < 0) { | |
1482 | ASSERT(0); | |
014c2544 | 1483 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1484 | } |
1485 | mp->m_sb.sb_ifree = lcounter; | |
014c2544 | 1486 | return 0; |
1da177e4 | 1487 | case XFS_SBS_FDBLOCKS: |
4be536de DC |
1488 | lcounter = (long long) |
1489 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); | |
1da177e4 LT |
1490 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
1491 | ||
1492 | if (delta > 0) { /* Putting blocks back */ | |
1493 | if (res_used > delta) { | |
1494 | mp->m_resblks_avail += delta; | |
1495 | } else { | |
1496 | rem = delta - res_used; | |
1497 | mp->m_resblks_avail = mp->m_resblks; | |
1498 | lcounter += rem; | |
1499 | } | |
1500 | } else { /* Taking blocks away */ | |
1501 | ||
1502 | lcounter += delta; | |
1503 | ||
1504 | /* | |
1505 | * If were out of blocks, use any available reserved blocks if | |
1506 | * were allowed to. | |
1507 | */ | |
1508 | ||
1509 | if (lcounter < 0) { | |
1510 | if (rsvd) { | |
1511 | lcounter = (long long)mp->m_resblks_avail + delta; | |
1512 | if (lcounter < 0) { | |
014c2544 | 1513 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1514 | } |
1515 | mp->m_resblks_avail = lcounter; | |
014c2544 | 1516 | return 0; |
1da177e4 | 1517 | } else { /* not reserved */ |
014c2544 | 1518 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1519 | } |
1520 | } | |
1521 | } | |
1522 | ||
4be536de | 1523 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
014c2544 | 1524 | return 0; |
1da177e4 LT |
1525 | case XFS_SBS_FREXTENTS: |
1526 | lcounter = (long long)mp->m_sb.sb_frextents; | |
1527 | lcounter += delta; | |
1528 | if (lcounter < 0) { | |
014c2544 | 1529 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1530 | } |
1531 | mp->m_sb.sb_frextents = lcounter; | |
014c2544 | 1532 | return 0; |
1da177e4 LT |
1533 | case XFS_SBS_DBLOCKS: |
1534 | lcounter = (long long)mp->m_sb.sb_dblocks; | |
1535 | lcounter += delta; | |
1536 | if (lcounter < 0) { | |
1537 | ASSERT(0); | |
014c2544 | 1538 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1539 | } |
1540 | mp->m_sb.sb_dblocks = lcounter; | |
014c2544 | 1541 | return 0; |
1da177e4 LT |
1542 | case XFS_SBS_AGCOUNT: |
1543 | scounter = mp->m_sb.sb_agcount; | |
1544 | scounter += delta; | |
1545 | if (scounter < 0) { | |
1546 | ASSERT(0); | |
014c2544 | 1547 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1548 | } |
1549 | mp->m_sb.sb_agcount = scounter; | |
014c2544 | 1550 | return 0; |
1da177e4 LT |
1551 | case XFS_SBS_IMAX_PCT: |
1552 | scounter = mp->m_sb.sb_imax_pct; | |
1553 | scounter += delta; | |
1554 | if (scounter < 0) { | |
1555 | ASSERT(0); | |
014c2544 | 1556 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1557 | } |
1558 | mp->m_sb.sb_imax_pct = scounter; | |
014c2544 | 1559 | return 0; |
1da177e4 LT |
1560 | case XFS_SBS_REXTSIZE: |
1561 | scounter = mp->m_sb.sb_rextsize; | |
1562 | scounter += delta; | |
1563 | if (scounter < 0) { | |
1564 | ASSERT(0); | |
014c2544 | 1565 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1566 | } |
1567 | mp->m_sb.sb_rextsize = scounter; | |
014c2544 | 1568 | return 0; |
1da177e4 LT |
1569 | case XFS_SBS_RBMBLOCKS: |
1570 | scounter = mp->m_sb.sb_rbmblocks; | |
1571 | scounter += delta; | |
1572 | if (scounter < 0) { | |
1573 | ASSERT(0); | |
014c2544 | 1574 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1575 | } |
1576 | mp->m_sb.sb_rbmblocks = scounter; | |
014c2544 | 1577 | return 0; |
1da177e4 LT |
1578 | case XFS_SBS_RBLOCKS: |
1579 | lcounter = (long long)mp->m_sb.sb_rblocks; | |
1580 | lcounter += delta; | |
1581 | if (lcounter < 0) { | |
1582 | ASSERT(0); | |
014c2544 | 1583 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1584 | } |
1585 | mp->m_sb.sb_rblocks = lcounter; | |
014c2544 | 1586 | return 0; |
1da177e4 LT |
1587 | case XFS_SBS_REXTENTS: |
1588 | lcounter = (long long)mp->m_sb.sb_rextents; | |
1589 | lcounter += delta; | |
1590 | if (lcounter < 0) { | |
1591 | ASSERT(0); | |
014c2544 | 1592 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1593 | } |
1594 | mp->m_sb.sb_rextents = lcounter; | |
014c2544 | 1595 | return 0; |
1da177e4 LT |
1596 | case XFS_SBS_REXTSLOG: |
1597 | scounter = mp->m_sb.sb_rextslog; | |
1598 | scounter += delta; | |
1599 | if (scounter < 0) { | |
1600 | ASSERT(0); | |
014c2544 | 1601 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1602 | } |
1603 | mp->m_sb.sb_rextslog = scounter; | |
014c2544 | 1604 | return 0; |
1da177e4 LT |
1605 | default: |
1606 | ASSERT(0); | |
014c2544 | 1607 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1608 | } |
1609 | } | |
1610 | ||
1611 | /* | |
1612 | * xfs_mod_incore_sb() is used to change a field in the in-core | |
1613 | * superblock structure by the specified delta. This modification | |
1614 | * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked() | |
1615 | * routine to do the work. | |
1616 | */ | |
1617 | int | |
20f4ebf2 DC |
1618 | xfs_mod_incore_sb( |
1619 | xfs_mount_t *mp, | |
1620 | xfs_sb_field_t field, | |
1621 | int64_t delta, | |
1622 | int rsvd) | |
1da177e4 LT |
1623 | { |
1624 | unsigned long s; | |
1625 | int status; | |
1626 | ||
8d280b98 DC |
1627 | /* check for per-cpu counters */ |
1628 | switch (field) { | |
1629 | #ifdef HAVE_PERCPU_SB | |
1630 | case XFS_SBS_ICOUNT: | |
1631 | case XFS_SBS_IFREE: | |
1632 | case XFS_SBS_FDBLOCKS: | |
1633 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
1634 | status = xfs_icsb_modify_counters(mp, field, | |
1635 | delta, rsvd); | |
1636 | break; | |
1637 | } | |
1638 | /* FALLTHROUGH */ | |
1639 | #endif | |
1640 | default: | |
1641 | s = XFS_SB_LOCK(mp); | |
1642 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); | |
1643 | XFS_SB_UNLOCK(mp, s); | |
1644 | break; | |
1645 | } | |
1646 | ||
014c2544 | 1647 | return status; |
1da177e4 LT |
1648 | } |
1649 | ||
1650 | /* | |
1651 | * xfs_mod_incore_sb_batch() is used to change more than one field | |
1652 | * in the in-core superblock structure at a time. This modification | |
1653 | * is protected by a lock internal to this module. The fields and | |
1654 | * changes to those fields are specified in the array of xfs_mod_sb | |
1655 | * structures passed in. | |
1656 | * | |
1657 | * Either all of the specified deltas will be applied or none of | |
1658 | * them will. If any modified field dips below 0, then all modifications | |
1659 | * will be backed out and EINVAL will be returned. | |
1660 | */ | |
1661 | int | |
1662 | xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd) | |
1663 | { | |
1664 | unsigned long s; | |
1665 | int status=0; | |
1666 | xfs_mod_sb_t *msbp; | |
1667 | ||
1668 | /* | |
1669 | * Loop through the array of mod structures and apply each | |
1670 | * individually. If any fail, then back out all those | |
1671 | * which have already been applied. Do all of this within | |
1672 | * the scope of the SB_LOCK so that all of the changes will | |
1673 | * be atomic. | |
1674 | */ | |
1675 | s = XFS_SB_LOCK(mp); | |
1676 | msbp = &msb[0]; | |
1677 | for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) { | |
1678 | /* | |
1679 | * Apply the delta at index n. If it fails, break | |
1680 | * from the loop so we'll fall into the undo loop | |
1681 | * below. | |
1682 | */ | |
8d280b98 DC |
1683 | switch (msbp->msb_field) { |
1684 | #ifdef HAVE_PERCPU_SB | |
1685 | case XFS_SBS_ICOUNT: | |
1686 | case XFS_SBS_IFREE: | |
1687 | case XFS_SBS_FDBLOCKS: | |
1688 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
20b64285 DC |
1689 | XFS_SB_UNLOCK(mp, s); |
1690 | status = xfs_icsb_modify_counters(mp, | |
8d280b98 DC |
1691 | msbp->msb_field, |
1692 | msbp->msb_delta, rsvd); | |
20b64285 | 1693 | s = XFS_SB_LOCK(mp); |
8d280b98 DC |
1694 | break; |
1695 | } | |
1696 | /* FALLTHROUGH */ | |
1697 | #endif | |
1698 | default: | |
1699 | status = xfs_mod_incore_sb_unlocked(mp, | |
1700 | msbp->msb_field, | |
1701 | msbp->msb_delta, rsvd); | |
1702 | break; | |
1703 | } | |
1704 | ||
1da177e4 LT |
1705 | if (status != 0) { |
1706 | break; | |
1707 | } | |
1708 | } | |
1709 | ||
1710 | /* | |
1711 | * If we didn't complete the loop above, then back out | |
1712 | * any changes made to the superblock. If you add code | |
1713 | * between the loop above and here, make sure that you | |
1714 | * preserve the value of status. Loop back until | |
1715 | * we step below the beginning of the array. Make sure | |
1716 | * we don't touch anything back there. | |
1717 | */ | |
1718 | if (status != 0) { | |
1719 | msbp--; | |
1720 | while (msbp >= msb) { | |
8d280b98 DC |
1721 | switch (msbp->msb_field) { |
1722 | #ifdef HAVE_PERCPU_SB | |
1723 | case XFS_SBS_ICOUNT: | |
1724 | case XFS_SBS_IFREE: | |
1725 | case XFS_SBS_FDBLOCKS: | |
1726 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
20b64285 DC |
1727 | XFS_SB_UNLOCK(mp, s); |
1728 | status = xfs_icsb_modify_counters(mp, | |
8d280b98 DC |
1729 | msbp->msb_field, |
1730 | -(msbp->msb_delta), | |
1731 | rsvd); | |
20b64285 | 1732 | s = XFS_SB_LOCK(mp); |
8d280b98 DC |
1733 | break; |
1734 | } | |
1735 | /* FALLTHROUGH */ | |
1736 | #endif | |
1737 | default: | |
1738 | status = xfs_mod_incore_sb_unlocked(mp, | |
1739 | msbp->msb_field, | |
1740 | -(msbp->msb_delta), | |
1741 | rsvd); | |
1742 | break; | |
1743 | } | |
1da177e4 LT |
1744 | ASSERT(status == 0); |
1745 | msbp--; | |
1746 | } | |
1747 | } | |
1748 | XFS_SB_UNLOCK(mp, s); | |
014c2544 | 1749 | return status; |
1da177e4 LT |
1750 | } |
1751 | ||
1752 | /* | |
1753 | * xfs_getsb() is called to obtain the buffer for the superblock. | |
1754 | * The buffer is returned locked and read in from disk. | |
1755 | * The buffer should be released with a call to xfs_brelse(). | |
1756 | * | |
1757 | * If the flags parameter is BUF_TRYLOCK, then we'll only return | |
1758 | * the superblock buffer if it can be locked without sleeping. | |
1759 | * If it can't then we'll return NULL. | |
1760 | */ | |
1761 | xfs_buf_t * | |
1762 | xfs_getsb( | |
1763 | xfs_mount_t *mp, | |
1764 | int flags) | |
1765 | { | |
1766 | xfs_buf_t *bp; | |
1767 | ||
1768 | ASSERT(mp->m_sb_bp != NULL); | |
1769 | bp = mp->m_sb_bp; | |
1770 | if (flags & XFS_BUF_TRYLOCK) { | |
1771 | if (!XFS_BUF_CPSEMA(bp)) { | |
1772 | return NULL; | |
1773 | } | |
1774 | } else { | |
1775 | XFS_BUF_PSEMA(bp, PRIBIO); | |
1776 | } | |
1777 | XFS_BUF_HOLD(bp); | |
1778 | ASSERT(XFS_BUF_ISDONE(bp)); | |
014c2544 | 1779 | return bp; |
1da177e4 LT |
1780 | } |
1781 | ||
1782 | /* | |
1783 | * Used to free the superblock along various error paths. | |
1784 | */ | |
1785 | void | |
1786 | xfs_freesb( | |
1787 | xfs_mount_t *mp) | |
1788 | { | |
1789 | xfs_buf_t *bp; | |
1790 | ||
1791 | /* | |
1792 | * Use xfs_getsb() so that the buffer will be locked | |
1793 | * when we call xfs_buf_relse(). | |
1794 | */ | |
1795 | bp = xfs_getsb(mp, 0); | |
1796 | XFS_BUF_UNMANAGE(bp); | |
1797 | xfs_buf_relse(bp); | |
1798 | mp->m_sb_bp = NULL; | |
1799 | } | |
1800 | ||
1801 | /* | |
1802 | * See if the UUID is unique among mounted XFS filesystems. | |
1803 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. | |
1804 | */ | |
1805 | STATIC int | |
1806 | xfs_uuid_mount( | |
1807 | xfs_mount_t *mp) | |
1808 | { | |
1809 | if (uuid_is_nil(&mp->m_sb.sb_uuid)) { | |
1810 | cmn_err(CE_WARN, | |
1811 | "XFS: Filesystem %s has nil UUID - can't mount", | |
1812 | mp->m_fsname); | |
1813 | return -1; | |
1814 | } | |
1815 | if (!uuid_table_insert(&mp->m_sb.sb_uuid)) { | |
1816 | cmn_err(CE_WARN, | |
1817 | "XFS: Filesystem %s has duplicate UUID - can't mount", | |
1818 | mp->m_fsname); | |
1819 | return -1; | |
1820 | } | |
1821 | return 0; | |
1822 | } | |
1823 | ||
1824 | /* | |
1825 | * Remove filesystem from the UUID table. | |
1826 | */ | |
1827 | STATIC void | |
1828 | xfs_uuid_unmount( | |
1829 | xfs_mount_t *mp) | |
1830 | { | |
1831 | uuid_table_remove(&mp->m_sb.sb_uuid); | |
1832 | } | |
1833 | ||
1834 | /* | |
1835 | * Used to log changes to the superblock unit and width fields which could | |
1836 | * be altered by the mount options. Only the first superblock is updated. | |
1837 | */ | |
1838 | STATIC void | |
1839 | xfs_mount_log_sbunit( | |
1840 | xfs_mount_t *mp, | |
1841 | __int64_t fields) | |
1842 | { | |
1843 | xfs_trans_t *tp; | |
1844 | ||
1845 | ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID)); | |
1846 | ||
1847 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); | |
1848 | if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1849 | XFS_DEFAULT_LOG_COUNT)) { | |
1850 | xfs_trans_cancel(tp, 0); | |
1851 | return; | |
1852 | } | |
1853 | xfs_mod_sb(tp, fields); | |
1c72bf90 | 1854 | xfs_trans_commit(tp, 0); |
1da177e4 | 1855 | } |
8d280b98 DC |
1856 | |
1857 | ||
1858 | #ifdef HAVE_PERCPU_SB | |
1859 | /* | |
1860 | * Per-cpu incore superblock counters | |
1861 | * | |
1862 | * Simple concept, difficult implementation | |
1863 | * | |
1864 | * Basically, replace the incore superblock counters with a distributed per cpu | |
1865 | * counter for contended fields (e.g. free block count). | |
1866 | * | |
1867 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and | |
1868 | * hence needs to be accurately read when we are running low on space. Hence | |
1869 | * there is a method to enable and disable the per-cpu counters based on how | |
1870 | * much "stuff" is available in them. | |
1871 | * | |
1872 | * Basically, a counter is enabled if there is enough free resource to justify | |
1873 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local | |
1874 | * ENOSPC), then we disable the counters to synchronise all callers and | |
1875 | * re-distribute the available resources. | |
1876 | * | |
1877 | * If, once we redistributed the available resources, we still get a failure, | |
1878 | * we disable the per-cpu counter and go through the slow path. | |
1879 | * | |
1880 | * The slow path is the current xfs_mod_incore_sb() function. This means that | |
1881 | * when we disable a per-cpu counter, we need to drain it's resources back to | |
1882 | * the global superblock. We do this after disabling the counter to prevent | |
1883 | * more threads from queueing up on the counter. | |
1884 | * | |
1885 | * Essentially, this means that we still need a lock in the fast path to enable | |
1886 | * synchronisation between the global counters and the per-cpu counters. This | |
1887 | * is not a problem because the lock will be local to a CPU almost all the time | |
1888 | * and have little contention except when we get to ENOSPC conditions. | |
1889 | * | |
1890 | * Basically, this lock becomes a barrier that enables us to lock out the fast | |
1891 | * path while we do things like enabling and disabling counters and | |
1892 | * synchronising the counters. | |
1893 | * | |
1894 | * Locking rules: | |
1895 | * | |
1896 | * 1. XFS_SB_LOCK() before picking up per-cpu locks | |
1897 | * 2. per-cpu locks always picked up via for_each_online_cpu() order | |
1898 | * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks | |
1899 | * 4. modifying per-cpu counters requires holding per-cpu lock | |
1900 | * 5. modifying global counters requires holding XFS_SB_LOCK | |
1901 | * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK | |
1902 | * and _none_ of the per-cpu locks. | |
1903 | * | |
1904 | * Disabled counters are only ever re-enabled by a balance operation | |
1905 | * that results in more free resources per CPU than a given threshold. | |
1906 | * To ensure counters don't remain disabled, they are rebalanced when | |
1907 | * the global resource goes above a higher threshold (i.e. some hysteresis | |
1908 | * is present to prevent thrashing). | |
e8234a68 DC |
1909 | */ |
1910 | ||
5a67e4c5 | 1911 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1912 | /* |
1913 | * hot-plug CPU notifier support. | |
8d280b98 | 1914 | * |
5a67e4c5 CS |
1915 | * We need a notifier per filesystem as we need to be able to identify |
1916 | * the filesystem to balance the counters out. This is achieved by | |
1917 | * having a notifier block embedded in the xfs_mount_t and doing pointer | |
1918 | * magic to get the mount pointer from the notifier block address. | |
8d280b98 | 1919 | */ |
e8234a68 DC |
1920 | STATIC int |
1921 | xfs_icsb_cpu_notify( | |
1922 | struct notifier_block *nfb, | |
1923 | unsigned long action, | |
1924 | void *hcpu) | |
1925 | { | |
1926 | xfs_icsb_cnts_t *cntp; | |
1927 | xfs_mount_t *mp; | |
1928 | int s; | |
1929 | ||
1930 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); | |
1931 | cntp = (xfs_icsb_cnts_t *) | |
1932 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); | |
1933 | switch (action) { | |
1934 | case CPU_UP_PREPARE: | |
8bb78442 | 1935 | case CPU_UP_PREPARE_FROZEN: |
e8234a68 DC |
1936 | /* Easy Case - initialize the area and locks, and |
1937 | * then rebalance when online does everything else for us. */ | |
01e1b69c | 1938 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 DC |
1939 | break; |
1940 | case CPU_ONLINE: | |
8bb78442 | 1941 | case CPU_ONLINE_FROZEN: |
03135cf7 | 1942 | xfs_icsb_lock(mp); |
20b64285 DC |
1943 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); |
1944 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
1945 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
03135cf7 | 1946 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1947 | break; |
1948 | case CPU_DEAD: | |
8bb78442 | 1949 | case CPU_DEAD_FROZEN: |
e8234a68 DC |
1950 | /* Disable all the counters, then fold the dead cpu's |
1951 | * count into the total on the global superblock and | |
1952 | * re-enable the counters. */ | |
03135cf7 | 1953 | xfs_icsb_lock(mp); |
e8234a68 DC |
1954 | s = XFS_SB_LOCK(mp); |
1955 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); | |
1956 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); | |
1957 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); | |
1958 | ||
1959 | mp->m_sb.sb_icount += cntp->icsb_icount; | |
1960 | mp->m_sb.sb_ifree += cntp->icsb_ifree; | |
1961 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; | |
1962 | ||
01e1b69c | 1963 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 | 1964 | |
20b64285 DC |
1965 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, |
1966 | XFS_ICSB_SB_LOCKED, 0); | |
1967 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, | |
1968 | XFS_ICSB_SB_LOCKED, 0); | |
1969 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, | |
1970 | XFS_ICSB_SB_LOCKED, 0); | |
e8234a68 | 1971 | XFS_SB_UNLOCK(mp, s); |
03135cf7 | 1972 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1973 | break; |
1974 | } | |
1975 | ||
1976 | return NOTIFY_OK; | |
1977 | } | |
5a67e4c5 | 1978 | #endif /* CONFIG_HOTPLUG_CPU */ |
e8234a68 | 1979 | |
8d280b98 DC |
1980 | int |
1981 | xfs_icsb_init_counters( | |
1982 | xfs_mount_t *mp) | |
1983 | { | |
1984 | xfs_icsb_cnts_t *cntp; | |
1985 | int i; | |
1986 | ||
1987 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); | |
1988 | if (mp->m_sb_cnts == NULL) | |
1989 | return -ENOMEM; | |
1990 | ||
5a67e4c5 | 1991 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1992 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; |
1993 | mp->m_icsb_notifier.priority = 0; | |
5a67e4c5 CS |
1994 | register_hotcpu_notifier(&mp->m_icsb_notifier); |
1995 | #endif /* CONFIG_HOTPLUG_CPU */ | |
e8234a68 | 1996 | |
8d280b98 DC |
1997 | for_each_online_cpu(i) { |
1998 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1999 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
8d280b98 | 2000 | } |
20b64285 DC |
2001 | |
2002 | mutex_init(&mp->m_icsb_mutex); | |
2003 | ||
8d280b98 DC |
2004 | /* |
2005 | * start with all counters disabled so that the | |
2006 | * initial balance kicks us off correctly | |
2007 | */ | |
2008 | mp->m_icsb_counters = -1; | |
2009 | return 0; | |
2010 | } | |
2011 | ||
5478eead LM |
2012 | void |
2013 | xfs_icsb_reinit_counters( | |
2014 | xfs_mount_t *mp) | |
2015 | { | |
2016 | xfs_icsb_lock(mp); | |
2017 | /* | |
2018 | * start with all counters disabled so that the | |
2019 | * initial balance kicks us off correctly | |
2020 | */ | |
2021 | mp->m_icsb_counters = -1; | |
2022 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); | |
2023 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
2024 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
2025 | xfs_icsb_unlock(mp); | |
2026 | } | |
2027 | ||
8d280b98 DC |
2028 | STATIC void |
2029 | xfs_icsb_destroy_counters( | |
2030 | xfs_mount_t *mp) | |
2031 | { | |
e8234a68 | 2032 | if (mp->m_sb_cnts) { |
5a67e4c5 | 2033 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
8d280b98 | 2034 | free_percpu(mp->m_sb_cnts); |
e8234a68 | 2035 | } |
03135cf7 | 2036 | mutex_destroy(&mp->m_icsb_mutex); |
8d280b98 DC |
2037 | } |
2038 | ||
7989cb8e | 2039 | STATIC_INLINE void |
01e1b69c DC |
2040 | xfs_icsb_lock_cntr( |
2041 | xfs_icsb_cnts_t *icsbp) | |
2042 | { | |
2043 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { | |
2044 | ndelay(1000); | |
2045 | } | |
2046 | } | |
2047 | ||
7989cb8e | 2048 | STATIC_INLINE void |
01e1b69c DC |
2049 | xfs_icsb_unlock_cntr( |
2050 | xfs_icsb_cnts_t *icsbp) | |
2051 | { | |
2052 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); | |
2053 | } | |
2054 | ||
8d280b98 | 2055 | |
7989cb8e | 2056 | STATIC_INLINE void |
8d280b98 DC |
2057 | xfs_icsb_lock_all_counters( |
2058 | xfs_mount_t *mp) | |
2059 | { | |
2060 | xfs_icsb_cnts_t *cntp; | |
2061 | int i; | |
2062 | ||
2063 | for_each_online_cpu(i) { | |
2064 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2065 | xfs_icsb_lock_cntr(cntp); |
8d280b98 DC |
2066 | } |
2067 | } | |
2068 | ||
7989cb8e | 2069 | STATIC_INLINE void |
8d280b98 DC |
2070 | xfs_icsb_unlock_all_counters( |
2071 | xfs_mount_t *mp) | |
2072 | { | |
2073 | xfs_icsb_cnts_t *cntp; | |
2074 | int i; | |
2075 | ||
2076 | for_each_online_cpu(i) { | |
2077 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2078 | xfs_icsb_unlock_cntr(cntp); |
8d280b98 DC |
2079 | } |
2080 | } | |
2081 | ||
2082 | STATIC void | |
2083 | xfs_icsb_count( | |
2084 | xfs_mount_t *mp, | |
2085 | xfs_icsb_cnts_t *cnt, | |
2086 | int flags) | |
2087 | { | |
2088 | xfs_icsb_cnts_t *cntp; | |
2089 | int i; | |
2090 | ||
2091 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); | |
2092 | ||
2093 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2094 | xfs_icsb_lock_all_counters(mp); | |
2095 | ||
2096 | for_each_online_cpu(i) { | |
2097 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
2098 | cnt->icsb_icount += cntp->icsb_icount; | |
2099 | cnt->icsb_ifree += cntp->icsb_ifree; | |
2100 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; | |
2101 | } | |
2102 | ||
2103 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2104 | xfs_icsb_unlock_all_counters(mp); | |
2105 | } | |
2106 | ||
2107 | STATIC int | |
2108 | xfs_icsb_counter_disabled( | |
2109 | xfs_mount_t *mp, | |
2110 | xfs_sb_field_t field) | |
2111 | { | |
2112 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2113 | return test_bit(field, &mp->m_icsb_counters); | |
2114 | } | |
2115 | ||
2116 | STATIC int | |
2117 | xfs_icsb_disable_counter( | |
2118 | xfs_mount_t *mp, | |
2119 | xfs_sb_field_t field) | |
2120 | { | |
2121 | xfs_icsb_cnts_t cnt; | |
2122 | ||
2123 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2124 | ||
20b64285 DC |
2125 | /* |
2126 | * If we are already disabled, then there is nothing to do | |
2127 | * here. We check before locking all the counters to avoid | |
2128 | * the expensive lock operation when being called in the | |
2129 | * slow path and the counter is already disabled. This is | |
2130 | * safe because the only time we set or clear this state is under | |
2131 | * the m_icsb_mutex. | |
2132 | */ | |
2133 | if (xfs_icsb_counter_disabled(mp, field)) | |
2134 | return 0; | |
2135 | ||
8d280b98 DC |
2136 | xfs_icsb_lock_all_counters(mp); |
2137 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { | |
2138 | /* drain back to superblock */ | |
2139 | ||
2140 | xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT); | |
2141 | switch(field) { | |
2142 | case XFS_SBS_ICOUNT: | |
2143 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2144 | break; | |
2145 | case XFS_SBS_IFREE: | |
2146 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2147 | break; | |
2148 | case XFS_SBS_FDBLOCKS: | |
2149 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2150 | break; | |
2151 | default: | |
2152 | BUG(); | |
2153 | } | |
2154 | } | |
2155 | ||
2156 | xfs_icsb_unlock_all_counters(mp); | |
2157 | ||
2158 | return 0; | |
2159 | } | |
2160 | ||
2161 | STATIC void | |
2162 | xfs_icsb_enable_counter( | |
2163 | xfs_mount_t *mp, | |
2164 | xfs_sb_field_t field, | |
2165 | uint64_t count, | |
2166 | uint64_t resid) | |
2167 | { | |
2168 | xfs_icsb_cnts_t *cntp; | |
2169 | int i; | |
2170 | ||
2171 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2172 | ||
2173 | xfs_icsb_lock_all_counters(mp); | |
2174 | for_each_online_cpu(i) { | |
2175 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); | |
2176 | switch (field) { | |
2177 | case XFS_SBS_ICOUNT: | |
2178 | cntp->icsb_icount = count + resid; | |
2179 | break; | |
2180 | case XFS_SBS_IFREE: | |
2181 | cntp->icsb_ifree = count + resid; | |
2182 | break; | |
2183 | case XFS_SBS_FDBLOCKS: | |
2184 | cntp->icsb_fdblocks = count + resid; | |
2185 | break; | |
2186 | default: | |
2187 | BUG(); | |
2188 | break; | |
2189 | } | |
2190 | resid = 0; | |
2191 | } | |
2192 | clear_bit(field, &mp->m_icsb_counters); | |
2193 | xfs_icsb_unlock_all_counters(mp); | |
2194 | } | |
2195 | ||
dbcabad1 DC |
2196 | void |
2197 | xfs_icsb_sync_counters_flags( | |
8d280b98 DC |
2198 | xfs_mount_t *mp, |
2199 | int flags) | |
2200 | { | |
2201 | xfs_icsb_cnts_t cnt; | |
2202 | int s; | |
2203 | ||
2204 | /* Pass 1: lock all counters */ | |
2205 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
2206 | s = XFS_SB_LOCK(mp); | |
2207 | ||
2208 | xfs_icsb_count(mp, &cnt, flags); | |
2209 | ||
2210 | /* Step 3: update mp->m_sb fields */ | |
2211 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) | |
2212 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2213 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) | |
2214 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2215 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) | |
2216 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2217 | ||
2218 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
2219 | XFS_SB_UNLOCK(mp, s); | |
2220 | } | |
2221 | ||
2222 | /* | |
2223 | * Accurate update of per-cpu counters to incore superblock | |
2224 | */ | |
2225 | STATIC void | |
2226 | xfs_icsb_sync_counters( | |
2227 | xfs_mount_t *mp) | |
2228 | { | |
dbcabad1 | 2229 | xfs_icsb_sync_counters_flags(mp, 0); |
8d280b98 DC |
2230 | } |
2231 | ||
2232 | /* | |
2233 | * Balance and enable/disable counters as necessary. | |
2234 | * | |
20b64285 DC |
2235 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
2236 | * chosen to be the same number as single on disk allocation chunk per CPU, and | |
2237 | * free blocks is something far enough zero that we aren't going thrash when we | |
2238 | * get near ENOSPC. We also need to supply a minimum we require per cpu to | |
2239 | * prevent looping endlessly when xfs_alloc_space asks for more than will | |
2240 | * be distributed to a single CPU but each CPU has enough blocks to be | |
2241 | * reenabled. | |
2242 | * | |
2243 | * Note that we can be called when counters are already disabled. | |
2244 | * xfs_icsb_disable_counter() optimises the counter locking in this case to | |
2245 | * prevent locking every per-cpu counter needlessly. | |
8d280b98 | 2246 | */ |
20b64285 DC |
2247 | |
2248 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 | |
4be536de | 2249 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
20b64285 | 2250 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
8d280b98 DC |
2251 | STATIC void |
2252 | xfs_icsb_balance_counter( | |
2253 | xfs_mount_t *mp, | |
2254 | xfs_sb_field_t field, | |
20b64285 DC |
2255 | int flags, |
2256 | int min_per_cpu) | |
8d280b98 | 2257 | { |
6fdf8ccc | 2258 | uint64_t count, resid; |
8d280b98 DC |
2259 | int weight = num_online_cpus(); |
2260 | int s; | |
20b64285 | 2261 | uint64_t min = (uint64_t)min_per_cpu; |
8d280b98 DC |
2262 | |
2263 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
2264 | s = XFS_SB_LOCK(mp); | |
2265 | ||
2266 | /* disable counter and sync counter */ | |
2267 | xfs_icsb_disable_counter(mp, field); | |
2268 | ||
2269 | /* update counters - first CPU gets residual*/ | |
2270 | switch (field) { | |
2271 | case XFS_SBS_ICOUNT: | |
2272 | count = mp->m_sb.sb_icount; | |
2273 | resid = do_div(count, weight); | |
20b64285 | 2274 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2275 | goto out; |
2276 | break; | |
2277 | case XFS_SBS_IFREE: | |
2278 | count = mp->m_sb.sb_ifree; | |
2279 | resid = do_div(count, weight); | |
20b64285 | 2280 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2281 | goto out; |
2282 | break; | |
2283 | case XFS_SBS_FDBLOCKS: | |
2284 | count = mp->m_sb.sb_fdblocks; | |
2285 | resid = do_div(count, weight); | |
20b64285 | 2286 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
8d280b98 DC |
2287 | goto out; |
2288 | break; | |
2289 | default: | |
2290 | BUG(); | |
6fdf8ccc | 2291 | count = resid = 0; /* quiet, gcc */ |
8d280b98 DC |
2292 | break; |
2293 | } | |
2294 | ||
2295 | xfs_icsb_enable_counter(mp, field, count, resid); | |
2296 | out: | |
2297 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
2298 | XFS_SB_UNLOCK(mp, s); | |
2299 | } | |
2300 | ||
20b64285 DC |
2301 | int |
2302 | xfs_icsb_modify_counters( | |
8d280b98 DC |
2303 | xfs_mount_t *mp, |
2304 | xfs_sb_field_t field, | |
20f4ebf2 | 2305 | int64_t delta, |
20b64285 | 2306 | int rsvd) |
8d280b98 DC |
2307 | { |
2308 | xfs_icsb_cnts_t *icsbp; | |
2309 | long long lcounter; /* long counter for 64 bit fields */ | |
20b64285 | 2310 | int cpu, ret = 0, s; |
8d280b98 | 2311 | |
20b64285 | 2312 | might_sleep(); |
8d280b98 DC |
2313 | again: |
2314 | cpu = get_cpu(); | |
20b64285 DC |
2315 | icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu); |
2316 | ||
2317 | /* | |
2318 | * if the counter is disabled, go to slow path | |
2319 | */ | |
8d280b98 DC |
2320 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
2321 | goto slow_path; | |
20b64285 DC |
2322 | xfs_icsb_lock_cntr(icsbp); |
2323 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { | |
2324 | xfs_icsb_unlock_cntr(icsbp); | |
2325 | goto slow_path; | |
2326 | } | |
8d280b98 DC |
2327 | |
2328 | switch (field) { | |
2329 | case XFS_SBS_ICOUNT: | |
2330 | lcounter = icsbp->icsb_icount; | |
2331 | lcounter += delta; | |
2332 | if (unlikely(lcounter < 0)) | |
20b64285 | 2333 | goto balance_counter; |
8d280b98 DC |
2334 | icsbp->icsb_icount = lcounter; |
2335 | break; | |
2336 | ||
2337 | case XFS_SBS_IFREE: | |
2338 | lcounter = icsbp->icsb_ifree; | |
2339 | lcounter += delta; | |
2340 | if (unlikely(lcounter < 0)) | |
20b64285 | 2341 | goto balance_counter; |
8d280b98 DC |
2342 | icsbp->icsb_ifree = lcounter; |
2343 | break; | |
2344 | ||
2345 | case XFS_SBS_FDBLOCKS: | |
2346 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); | |
2347 | ||
4be536de | 2348 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2349 | lcounter += delta; |
2350 | if (unlikely(lcounter < 0)) | |
20b64285 | 2351 | goto balance_counter; |
4be536de | 2352 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2353 | break; |
2354 | default: | |
2355 | BUG(); | |
2356 | break; | |
2357 | } | |
01e1b69c | 2358 | xfs_icsb_unlock_cntr(icsbp); |
8d280b98 | 2359 | put_cpu(); |
8d280b98 DC |
2360 | return 0; |
2361 | ||
8d280b98 | 2362 | slow_path: |
8d280b98 DC |
2363 | put_cpu(); |
2364 | ||
20b64285 DC |
2365 | /* |
2366 | * serialise with a mutex so we don't burn lots of cpu on | |
2367 | * the superblock lock. We still need to hold the superblock | |
2368 | * lock, however, when we modify the global structures. | |
2369 | */ | |
03135cf7 | 2370 | xfs_icsb_lock(mp); |
20b64285 DC |
2371 | |
2372 | /* | |
2373 | * Now running atomically. | |
2374 | * | |
2375 | * If the counter is enabled, someone has beaten us to rebalancing. | |
2376 | * Drop the lock and try again in the fast path.... | |
2377 | */ | |
2378 | if (!(xfs_icsb_counter_disabled(mp, field))) { | |
03135cf7 | 2379 | xfs_icsb_unlock(mp); |
8d280b98 | 2380 | goto again; |
8d280b98 DC |
2381 | } |
2382 | ||
20b64285 DC |
2383 | /* |
2384 | * The counter is currently disabled. Because we are | |
2385 | * running atomically here, we know a rebalance cannot | |
2386 | * be in progress. Hence we can go straight to operating | |
2387 | * on the global superblock. We do not call xfs_mod_incore_sb() | |
2388 | * here even though we need to get the SB_LOCK. Doing so | |
2389 | * will cause us to re-enter this function and deadlock. | |
2390 | * Hence we get the SB_LOCK ourselves and then call | |
2391 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates | |
2392 | * directly on the global counters. | |
2393 | */ | |
2394 | s = XFS_SB_LOCK(mp); | |
8d280b98 | 2395 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
20b64285 | 2396 | XFS_SB_UNLOCK(mp, s); |
8d280b98 | 2397 | |
20b64285 DC |
2398 | /* |
2399 | * Now that we've modified the global superblock, we | |
2400 | * may be able to re-enable the distributed counters | |
2401 | * (e.g. lots of space just got freed). After that | |
2402 | * we are done. | |
2403 | */ | |
2404 | if (ret != ENOSPC) | |
2405 | xfs_icsb_balance_counter(mp, field, 0, 0); | |
03135cf7 | 2406 | xfs_icsb_unlock(mp); |
8d280b98 | 2407 | return ret; |
8d280b98 | 2408 | |
20b64285 DC |
2409 | balance_counter: |
2410 | xfs_icsb_unlock_cntr(icsbp); | |
2411 | put_cpu(); | |
8d280b98 | 2412 | |
20b64285 DC |
2413 | /* |
2414 | * We may have multiple threads here if multiple per-cpu | |
2415 | * counters run dry at the same time. This will mean we can | |
2416 | * do more balances than strictly necessary but it is not | |
2417 | * the common slowpath case. | |
2418 | */ | |
03135cf7 | 2419 | xfs_icsb_lock(mp); |
20b64285 DC |
2420 | |
2421 | /* | |
2422 | * running atomically. | |
2423 | * | |
2424 | * This will leave the counter in the correct state for future | |
2425 | * accesses. After the rebalance, we simply try again and our retry | |
2426 | * will either succeed through the fast path or slow path without | |
2427 | * another balance operation being required. | |
2428 | */ | |
2429 | xfs_icsb_balance_counter(mp, field, 0, delta); | |
03135cf7 | 2430 | xfs_icsb_unlock(mp); |
20b64285 | 2431 | goto again; |
8d280b98 | 2432 | } |
20b64285 | 2433 | |
8d280b98 | 2434 | #endif |