Commit | Line | Data |
---|---|---|
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 | 24 | #include "xfs_trans.h" |
211e4d43 | 25 | #include "xfs_trans_priv.h" |
1da177e4 LT |
26 | #include "xfs_sb.h" |
27 | #include "xfs_ag.h" | |
1da177e4 | 28 | #include "xfs_dir2.h" |
1da177e4 | 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 LT |
33 | #include "xfs_dinode.h" |
34 | #include "xfs_inode.h" | |
a844f451 NS |
35 | #include "xfs_btree.h" |
36 | #include "xfs_ialloc.h" | |
1da177e4 LT |
37 | #include "xfs_alloc.h" |
38 | #include "xfs_rtalloc.h" | |
39 | #include "xfs_bmap.h" | |
40 | #include "xfs_error.h" | |
1da177e4 LT |
41 | #include "xfs_quota.h" |
42 | #include "xfs_fsops.h" | |
43355099 | 43 | #include "xfs_utils.h" |
0b1b213f | 44 | #include "xfs_trace.h" |
6d8b79cf | 45 | #include "xfs_icache.h" |
04a1e6c5 DC |
46 | #include "xfs_cksum.h" |
47 | #include "xfs_buf_item.h" | |
0b1b213f | 48 | |
1da177e4 | 49 | |
8d280b98 | 50 | #ifdef HAVE_PERCPU_SB |
20f4ebf2 | 51 | STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, |
45af6c6d CH |
52 | int); |
53 | STATIC void xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t, | |
54 | int); | |
36fbe6e6 | 55 | STATIC void xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t); |
8d280b98 DC |
56 | #else |
57 | ||
45af6c6d CH |
58 | #define xfs_icsb_balance_counter(mp, a, b) do { } while (0) |
59 | #define xfs_icsb_balance_counter_locked(mp, a, b) do { } while (0) | |
8d280b98 DC |
60 | #endif |
61 | ||
1df84c93 | 62 | static const struct { |
8d280b98 DC |
63 | short offset; |
64 | short type; /* 0 = integer | |
65 | * 1 = binary / string (no translation) | |
66 | */ | |
1da177e4 LT |
67 | } xfs_sb_info[] = { |
68 | { offsetof(xfs_sb_t, sb_magicnum), 0 }, | |
69 | { offsetof(xfs_sb_t, sb_blocksize), 0 }, | |
70 | { offsetof(xfs_sb_t, sb_dblocks), 0 }, | |
71 | { offsetof(xfs_sb_t, sb_rblocks), 0 }, | |
72 | { offsetof(xfs_sb_t, sb_rextents), 0 }, | |
73 | { offsetof(xfs_sb_t, sb_uuid), 1 }, | |
74 | { offsetof(xfs_sb_t, sb_logstart), 0 }, | |
75 | { offsetof(xfs_sb_t, sb_rootino), 0 }, | |
76 | { offsetof(xfs_sb_t, sb_rbmino), 0 }, | |
77 | { offsetof(xfs_sb_t, sb_rsumino), 0 }, | |
78 | { offsetof(xfs_sb_t, sb_rextsize), 0 }, | |
79 | { offsetof(xfs_sb_t, sb_agblocks), 0 }, | |
80 | { offsetof(xfs_sb_t, sb_agcount), 0 }, | |
81 | { offsetof(xfs_sb_t, sb_rbmblocks), 0 }, | |
82 | { offsetof(xfs_sb_t, sb_logblocks), 0 }, | |
83 | { offsetof(xfs_sb_t, sb_versionnum), 0 }, | |
84 | { offsetof(xfs_sb_t, sb_sectsize), 0 }, | |
85 | { offsetof(xfs_sb_t, sb_inodesize), 0 }, | |
86 | { offsetof(xfs_sb_t, sb_inopblock), 0 }, | |
87 | { offsetof(xfs_sb_t, sb_fname[0]), 1 }, | |
88 | { offsetof(xfs_sb_t, sb_blocklog), 0 }, | |
89 | { offsetof(xfs_sb_t, sb_sectlog), 0 }, | |
90 | { offsetof(xfs_sb_t, sb_inodelog), 0 }, | |
91 | { offsetof(xfs_sb_t, sb_inopblog), 0 }, | |
92 | { offsetof(xfs_sb_t, sb_agblklog), 0 }, | |
93 | { offsetof(xfs_sb_t, sb_rextslog), 0 }, | |
94 | { offsetof(xfs_sb_t, sb_inprogress), 0 }, | |
95 | { offsetof(xfs_sb_t, sb_imax_pct), 0 }, | |
96 | { offsetof(xfs_sb_t, sb_icount), 0 }, | |
97 | { offsetof(xfs_sb_t, sb_ifree), 0 }, | |
98 | { offsetof(xfs_sb_t, sb_fdblocks), 0 }, | |
99 | { offsetof(xfs_sb_t, sb_frextents), 0 }, | |
100 | { offsetof(xfs_sb_t, sb_uquotino), 0 }, | |
101 | { offsetof(xfs_sb_t, sb_gquotino), 0 }, | |
102 | { offsetof(xfs_sb_t, sb_qflags), 0 }, | |
103 | { offsetof(xfs_sb_t, sb_flags), 0 }, | |
104 | { offsetof(xfs_sb_t, sb_shared_vn), 0 }, | |
105 | { offsetof(xfs_sb_t, sb_inoalignmt), 0 }, | |
106 | { offsetof(xfs_sb_t, sb_unit), 0 }, | |
107 | { offsetof(xfs_sb_t, sb_width), 0 }, | |
108 | { offsetof(xfs_sb_t, sb_dirblklog), 0 }, | |
109 | { offsetof(xfs_sb_t, sb_logsectlog), 0 }, | |
110 | { offsetof(xfs_sb_t, sb_logsectsize),0 }, | |
111 | { offsetof(xfs_sb_t, sb_logsunit), 0 }, | |
112 | { offsetof(xfs_sb_t, sb_features2), 0 }, | |
ee1c0908 | 113 | { offsetof(xfs_sb_t, sb_bad_features2), 0 }, |
04a1e6c5 DC |
114 | { offsetof(xfs_sb_t, sb_features_compat), 0 }, |
115 | { offsetof(xfs_sb_t, sb_features_ro_compat), 0 }, | |
116 | { offsetof(xfs_sb_t, sb_features_incompat), 0 }, | |
e721f504 | 117 | { offsetof(xfs_sb_t, sb_features_log_incompat), 0 }, |
04a1e6c5 | 118 | { offsetof(xfs_sb_t, sb_crc), 0 }, |
e721f504 | 119 | { offsetof(xfs_sb_t, sb_pad), 0 }, |
04a1e6c5 DC |
120 | { offsetof(xfs_sb_t, sb_pquotino), 0 }, |
121 | { offsetof(xfs_sb_t, sb_lsn), 0 }, | |
1da177e4 LT |
122 | { sizeof(xfs_sb_t), 0 } |
123 | }; | |
124 | ||
27174203 CH |
125 | static DEFINE_MUTEX(xfs_uuid_table_mutex); |
126 | static int xfs_uuid_table_size; | |
127 | static uuid_t *xfs_uuid_table; | |
128 | ||
129 | /* | |
130 | * See if the UUID is unique among mounted XFS filesystems. | |
131 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. | |
132 | */ | |
133 | STATIC int | |
134 | xfs_uuid_mount( | |
135 | struct xfs_mount *mp) | |
136 | { | |
137 | uuid_t *uuid = &mp->m_sb.sb_uuid; | |
138 | int hole, i; | |
139 | ||
140 | if (mp->m_flags & XFS_MOUNT_NOUUID) | |
141 | return 0; | |
142 | ||
143 | if (uuid_is_nil(uuid)) { | |
0b932ccc | 144 | xfs_warn(mp, "Filesystem has nil UUID - can't mount"); |
27174203 CH |
145 | return XFS_ERROR(EINVAL); |
146 | } | |
147 | ||
148 | mutex_lock(&xfs_uuid_table_mutex); | |
149 | for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) { | |
150 | if (uuid_is_nil(&xfs_uuid_table[i])) { | |
151 | hole = i; | |
152 | continue; | |
153 | } | |
154 | if (uuid_equal(uuid, &xfs_uuid_table[i])) | |
155 | goto out_duplicate; | |
156 | } | |
157 | ||
158 | if (hole < 0) { | |
159 | xfs_uuid_table = kmem_realloc(xfs_uuid_table, | |
160 | (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table), | |
161 | xfs_uuid_table_size * sizeof(*xfs_uuid_table), | |
162 | KM_SLEEP); | |
163 | hole = xfs_uuid_table_size++; | |
164 | } | |
165 | xfs_uuid_table[hole] = *uuid; | |
166 | mutex_unlock(&xfs_uuid_table_mutex); | |
167 | ||
168 | return 0; | |
169 | ||
170 | out_duplicate: | |
171 | mutex_unlock(&xfs_uuid_table_mutex); | |
021000e5 | 172 | xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid); |
27174203 CH |
173 | return XFS_ERROR(EINVAL); |
174 | } | |
175 | ||
176 | STATIC void | |
177 | xfs_uuid_unmount( | |
178 | struct xfs_mount *mp) | |
179 | { | |
180 | uuid_t *uuid = &mp->m_sb.sb_uuid; | |
181 | int i; | |
182 | ||
183 | if (mp->m_flags & XFS_MOUNT_NOUUID) | |
184 | return; | |
185 | ||
186 | mutex_lock(&xfs_uuid_table_mutex); | |
187 | for (i = 0; i < xfs_uuid_table_size; i++) { | |
188 | if (uuid_is_nil(&xfs_uuid_table[i])) | |
189 | continue; | |
190 | if (!uuid_equal(uuid, &xfs_uuid_table[i])) | |
191 | continue; | |
192 | memset(&xfs_uuid_table[i], 0, sizeof(uuid_t)); | |
193 | break; | |
194 | } | |
195 | ASSERT(i < xfs_uuid_table_size); | |
196 | mutex_unlock(&xfs_uuid_table_mutex); | |
197 | } | |
198 | ||
199 | ||
0fa800fb DC |
200 | /* |
201 | * Reference counting access wrappers to the perag structures. | |
e176579e DC |
202 | * Because we never free per-ag structures, the only thing we |
203 | * have to protect against changes is the tree structure itself. | |
0fa800fb DC |
204 | */ |
205 | struct xfs_perag * | |
206 | xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno) | |
207 | { | |
208 | struct xfs_perag *pag; | |
209 | int ref = 0; | |
210 | ||
e176579e | 211 | rcu_read_lock(); |
0fa800fb DC |
212 | pag = radix_tree_lookup(&mp->m_perag_tree, agno); |
213 | if (pag) { | |
214 | ASSERT(atomic_read(&pag->pag_ref) >= 0); | |
0fa800fb DC |
215 | ref = atomic_inc_return(&pag->pag_ref); |
216 | } | |
e176579e | 217 | rcu_read_unlock(); |
0fa800fb DC |
218 | trace_xfs_perag_get(mp, agno, ref, _RET_IP_); |
219 | return pag; | |
220 | } | |
221 | ||
65d0f205 DC |
222 | /* |
223 | * search from @first to find the next perag with the given tag set. | |
224 | */ | |
225 | struct xfs_perag * | |
226 | xfs_perag_get_tag( | |
227 | struct xfs_mount *mp, | |
228 | xfs_agnumber_t first, | |
229 | int tag) | |
230 | { | |
231 | struct xfs_perag *pag; | |
232 | int found; | |
233 | int ref; | |
234 | ||
235 | rcu_read_lock(); | |
236 | found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, | |
237 | (void **)&pag, first, 1, tag); | |
238 | if (found <= 0) { | |
239 | rcu_read_unlock(); | |
240 | return NULL; | |
241 | } | |
242 | ref = atomic_inc_return(&pag->pag_ref); | |
243 | rcu_read_unlock(); | |
244 | trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_); | |
245 | return pag; | |
246 | } | |
247 | ||
0fa800fb DC |
248 | void |
249 | xfs_perag_put(struct xfs_perag *pag) | |
250 | { | |
251 | int ref; | |
252 | ||
253 | ASSERT(atomic_read(&pag->pag_ref) > 0); | |
254 | ref = atomic_dec_return(&pag->pag_ref); | |
255 | trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_); | |
256 | } | |
257 | ||
e176579e DC |
258 | STATIC void |
259 | __xfs_free_perag( | |
260 | struct rcu_head *head) | |
261 | { | |
262 | struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head); | |
263 | ||
264 | ASSERT(atomic_read(&pag->pag_ref) == 0); | |
265 | kmem_free(pag); | |
266 | } | |
267 | ||
1da177e4 | 268 | /* |
e176579e | 269 | * Free up the per-ag resources associated with the mount structure. |
1da177e4 | 270 | */ |
c962fb79 | 271 | STATIC void |
ff4f038c | 272 | xfs_free_perag( |
745f6919 | 273 | xfs_mount_t *mp) |
1da177e4 | 274 | { |
1c1c6ebc DC |
275 | xfs_agnumber_t agno; |
276 | struct xfs_perag *pag; | |
277 | ||
278 | for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { | |
279 | spin_lock(&mp->m_perag_lock); | |
280 | pag = radix_tree_delete(&mp->m_perag_tree, agno); | |
281 | spin_unlock(&mp->m_perag_lock); | |
e176579e | 282 | ASSERT(pag); |
f83282a8 | 283 | ASSERT(atomic_read(&pag->pag_ref) == 0); |
e176579e | 284 | call_rcu(&pag->rcu_head, __xfs_free_perag); |
1da177e4 | 285 | } |
1da177e4 LT |
286 | } |
287 | ||
4cc929ee NS |
288 | /* |
289 | * Check size of device based on the (data/realtime) block count. | |
290 | * Note: this check is used by the growfs code as well as mount. | |
291 | */ | |
292 | int | |
293 | xfs_sb_validate_fsb_count( | |
294 | xfs_sb_t *sbp, | |
295 | __uint64_t nblocks) | |
296 | { | |
297 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); | |
298 | ASSERT(sbp->sb_blocklog >= BBSHIFT); | |
299 | ||
300 | #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ | |
301 | if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) | |
657a4cff | 302 | return EFBIG; |
4cc929ee NS |
303 | #else /* Limited by UINT_MAX of sectors */ |
304 | if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX) | |
657a4cff | 305 | return EFBIG; |
4cc929ee NS |
306 | #endif |
307 | return 0; | |
308 | } | |
1da177e4 LT |
309 | |
310 | /* | |
311 | * Check the validity of the SB found. | |
312 | */ | |
313 | STATIC int | |
314 | xfs_mount_validate_sb( | |
315 | xfs_mount_t *mp, | |
764d1f89 | 316 | xfs_sb_t *sbp, |
34510185 DC |
317 | bool check_inprogress, |
318 | bool check_version) | |
1da177e4 | 319 | { |
af34e09d | 320 | |
1da177e4 LT |
321 | /* |
322 | * If the log device and data device have the | |
323 | * same device number, the log is internal. | |
324 | * Consequently, the sb_logstart should be non-zero. If | |
325 | * we have a zero sb_logstart in this case, we may be trying to mount | |
326 | * a volume filesystem in a non-volume manner. | |
327 | */ | |
328 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { | |
98021821 | 329 | xfs_warn(mp, "bad magic number"); |
1da177e4 LT |
330 | return XFS_ERROR(EWRONGFS); |
331 | } | |
332 | ||
04a1e6c5 | 333 | |
62118709 | 334 | if (!xfs_sb_good_version(sbp)) { |
98021821 | 335 | xfs_warn(mp, "bad version"); |
1da177e4 LT |
336 | return XFS_ERROR(EWRONGFS); |
337 | } | |
338 | ||
83e782e1 CS |
339 | if ((sbp->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) && |
340 | (sbp->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD | | |
341 | XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))) { | |
342 | xfs_notice(mp, | |
343 | "Super block has XFS_OQUOTA bits along with XFS_PQUOTA and/or XFS_GQUOTA bits.\n"); | |
344 | return XFS_ERROR(EFSCORRUPTED); | |
345 | } | |
346 | ||
04a1e6c5 | 347 | /* |
e721f504 | 348 | * Version 5 superblock feature mask validation. Reject combinations the |
34510185 DC |
349 | * kernel cannot support up front before checking anything else. For |
350 | * write validation, we don't need to check feature masks. | |
04a1e6c5 | 351 | */ |
34510185 | 352 | if (check_version && XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) { |
04a1e6c5 | 353 | xfs_alert(mp, |
e721f504 DC |
354 | "Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled!\n" |
355 | "Use of these features in this kernel is at your own risk!"); | |
356 | ||
357 | if (xfs_sb_has_compat_feature(sbp, | |
358 | XFS_SB_FEAT_COMPAT_UNKNOWN)) { | |
359 | xfs_warn(mp, | |
360 | "Superblock has unknown compatible features (0x%x) enabled.\n" | |
361 | "Using a more recent kernel is recommended.", | |
362 | (sbp->sb_features_compat & | |
363 | XFS_SB_FEAT_COMPAT_UNKNOWN)); | |
364 | } | |
365 | ||
366 | if (xfs_sb_has_ro_compat_feature(sbp, | |
367 | XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { | |
368 | xfs_alert(mp, | |
369 | "Superblock has unknown read-only compatible features (0x%x) enabled.", | |
370 | (sbp->sb_features_ro_compat & | |
371 | XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); | |
372 | if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { | |
373 | xfs_warn(mp, | |
374 | "Attempted to mount read-only compatible filesystem read-write.\n" | |
375 | "Filesystem can only be safely mounted read only."); | |
376 | return XFS_ERROR(EINVAL); | |
377 | } | |
378 | } | |
379 | if (xfs_sb_has_incompat_feature(sbp, | |
380 | XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { | |
381 | xfs_warn(mp, | |
382 | "Superblock has unknown incompatible features (0x%x) enabled.\n" | |
383 | "Filesystem can not be safely mounted by this kernel.", | |
384 | (sbp->sb_features_incompat & | |
385 | XFS_SB_FEAT_INCOMPAT_UNKNOWN)); | |
386 | return XFS_ERROR(EINVAL); | |
387 | } | |
04a1e6c5 DC |
388 | } |
389 | ||
1da177e4 LT |
390 | if (unlikely( |
391 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { | |
98021821 | 392 | xfs_warn(mp, |
af34e09d DC |
393 | "filesystem is marked as having an external log; " |
394 | "specify logdev on the mount command line."); | |
764d1f89 | 395 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
396 | } |
397 | ||
398 | if (unlikely( | |
399 | sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { | |
98021821 | 400 | xfs_warn(mp, |
af34e09d DC |
401 | "filesystem is marked as having an internal log; " |
402 | "do not specify logdev on the mount command line."); | |
764d1f89 | 403 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
404 | } |
405 | ||
406 | /* | |
c0e090ce | 407 | * More sanity checking. Most of these were stolen directly from |
1da177e4 LT |
408 | * xfs_repair. |
409 | */ | |
410 | if (unlikely( | |
411 | sbp->sb_agcount <= 0 || | |
412 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
413 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
414 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
415 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
2ac00af7 | 416 | sbp->sb_sectsize != (1 << sbp->sb_sectlog) || |
1da177e4 LT |
417 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || |
418 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
419 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
420 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
2ac00af7 | 421 | sbp->sb_blocksize != (1 << sbp->sb_blocklog) || |
1da177e4 LT |
422 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || |
423 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
9f989c94 NS |
424 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || |
425 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
2ac00af7 | 426 | sbp->sb_inodesize != (1 << sbp->sb_inodelog) || |
9f989c94 | 427 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || |
1da177e4 LT |
428 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || |
429 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
c0e090ce ES |
430 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || |
431 | sbp->sb_dblocks == 0 || | |
432 | sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || | |
433 | sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp))) { | |
98021821 | 434 | XFS_CORRUPTION_ERROR("SB sanity check failed", |
c0e090ce | 435 | XFS_ERRLEVEL_LOW, mp, sbp); |
1da177e4 LT |
436 | return XFS_ERROR(EFSCORRUPTED); |
437 | } | |
438 | ||
2edbddd5 LM |
439 | /* |
440 | * Until this is fixed only page-sized or smaller data blocks work. | |
441 | */ | |
442 | if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { | |
98021821 | 443 | xfs_warn(mp, |
af34e09d DC |
444 | "File system with blocksize %d bytes. " |
445 | "Only pagesize (%ld) or less will currently work.", | |
446 | sbp->sb_blocksize, PAGE_SIZE); | |
2edbddd5 LM |
447 | return XFS_ERROR(ENOSYS); |
448 | } | |
449 | ||
1a5902c5 CH |
450 | /* |
451 | * Currently only very few inode sizes are supported. | |
452 | */ | |
453 | switch (sbp->sb_inodesize) { | |
454 | case 256: | |
455 | case 512: | |
456 | case 1024: | |
457 | case 2048: | |
458 | break; | |
459 | default: | |
98021821 | 460 | xfs_warn(mp, "inode size of %d bytes not supported", |
af34e09d | 461 | sbp->sb_inodesize); |
1a5902c5 CH |
462 | return XFS_ERROR(ENOSYS); |
463 | } | |
464 | ||
4cc929ee NS |
465 | if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || |
466 | xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { | |
98021821 | 467 | xfs_warn(mp, |
af34e09d | 468 | "file system too large to be mounted on this system."); |
657a4cff | 469 | return XFS_ERROR(EFBIG); |
1da177e4 LT |
470 | } |
471 | ||
98021821 DC |
472 | if (check_inprogress && sbp->sb_inprogress) { |
473 | xfs_warn(mp, "Offline file system operation in progress!"); | |
1da177e4 LT |
474 | return XFS_ERROR(EFSCORRUPTED); |
475 | } | |
476 | ||
de20614b NS |
477 | /* |
478 | * Version 1 directory format has never worked on Linux. | |
479 | */ | |
62118709 | 480 | if (unlikely(!xfs_sb_version_hasdirv2(sbp))) { |
98021821 | 481 | xfs_warn(mp, "file system using version 1 directory format"); |
de20614b NS |
482 | return XFS_ERROR(ENOSYS); |
483 | } | |
484 | ||
1da177e4 LT |
485 | return 0; |
486 | } | |
487 | ||
1c1c6ebc | 488 | int |
c11e2c36 | 489 | xfs_initialize_perag( |
c11e2c36 | 490 | xfs_mount_t *mp, |
1c1c6ebc DC |
491 | xfs_agnumber_t agcount, |
492 | xfs_agnumber_t *maxagi) | |
1da177e4 | 493 | { |
2d2194f6 | 494 | xfs_agnumber_t index; |
8b26c582 | 495 | xfs_agnumber_t first_initialised = 0; |
1da177e4 LT |
496 | xfs_perag_t *pag; |
497 | xfs_agino_t agino; | |
498 | xfs_ino_t ino; | |
499 | xfs_sb_t *sbp = &mp->m_sb; | |
8b26c582 | 500 | int error = -ENOMEM; |
1da177e4 | 501 | |
1c1c6ebc DC |
502 | /* |
503 | * Walk the current per-ag tree so we don't try to initialise AGs | |
504 | * that already exist (growfs case). Allocate and insert all the | |
505 | * AGs we don't find ready for initialisation. | |
506 | */ | |
507 | for (index = 0; index < agcount; index++) { | |
508 | pag = xfs_perag_get(mp, index); | |
509 | if (pag) { | |
510 | xfs_perag_put(pag); | |
511 | continue; | |
512 | } | |
8b26c582 DC |
513 | if (!first_initialised) |
514 | first_initialised = index; | |
fb3b504a | 515 | |
1c1c6ebc DC |
516 | pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL); |
517 | if (!pag) | |
8b26c582 | 518 | goto out_unwind; |
fb3b504a CH |
519 | pag->pag_agno = index; |
520 | pag->pag_mount = mp; | |
1a427ab0 | 521 | spin_lock_init(&pag->pag_ici_lock); |
69b491c2 | 522 | mutex_init(&pag->pag_ici_reclaim_lock); |
fb3b504a | 523 | INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); |
74f75a0c DC |
524 | spin_lock_init(&pag->pag_buf_lock); |
525 | pag->pag_buf_tree = RB_ROOT; | |
fb3b504a | 526 | |
1c1c6ebc | 527 | if (radix_tree_preload(GFP_NOFS)) |
8b26c582 | 528 | goto out_unwind; |
fb3b504a | 529 | |
1c1c6ebc DC |
530 | spin_lock(&mp->m_perag_lock); |
531 | if (radix_tree_insert(&mp->m_perag_tree, index, pag)) { | |
532 | BUG(); | |
533 | spin_unlock(&mp->m_perag_lock); | |
8b26c582 DC |
534 | radix_tree_preload_end(); |
535 | error = -EEXIST; | |
536 | goto out_unwind; | |
1c1c6ebc DC |
537 | } |
538 | spin_unlock(&mp->m_perag_lock); | |
539 | radix_tree_preload_end(); | |
540 | } | |
541 | ||
fb3b504a CH |
542 | /* |
543 | * If we mount with the inode64 option, or no inode overflows | |
544 | * the legacy 32-bit address space clear the inode32 option. | |
1da177e4 | 545 | */ |
fb3b504a CH |
546 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); |
547 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); | |
548 | ||
549 | if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32) | |
1da177e4 | 550 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
fb3b504a | 551 | else |
1da177e4 | 552 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; |
1da177e4 | 553 | |
2d2194f6 CM |
554 | if (mp->m_flags & XFS_MOUNT_32BITINODES) |
555 | index = xfs_set_inode32(mp); | |
556 | else | |
557 | index = xfs_set_inode64(mp); | |
fb3b504a | 558 | |
1c1c6ebc DC |
559 | if (maxagi) |
560 | *maxagi = index; | |
561 | return 0; | |
8b26c582 DC |
562 | |
563 | out_unwind: | |
564 | kmem_free(pag); | |
565 | for (; index > first_initialised; index--) { | |
566 | pag = radix_tree_delete(&mp->m_perag_tree, index); | |
567 | kmem_free(pag); | |
568 | } | |
569 | return error; | |
1da177e4 LT |
570 | } |
571 | ||
83e782e1 CS |
572 | static void |
573 | xfs_sb_quota_from_disk(struct xfs_sb *sbp) | |
574 | { | |
575 | if (sbp->sb_qflags & XFS_OQUOTA_ENFD) | |
576 | sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? | |
577 | XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD; | |
578 | if (sbp->sb_qflags & XFS_OQUOTA_CHKD) | |
579 | sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ? | |
580 | XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD; | |
581 | sbp->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD); | |
582 | } | |
583 | ||
2bdf7cd0 CH |
584 | void |
585 | xfs_sb_from_disk( | |
98021821 | 586 | struct xfs_sb *to, |
2bdf7cd0 CH |
587 | xfs_dsb_t *from) |
588 | { | |
589 | to->sb_magicnum = be32_to_cpu(from->sb_magicnum); | |
590 | to->sb_blocksize = be32_to_cpu(from->sb_blocksize); | |
591 | to->sb_dblocks = be64_to_cpu(from->sb_dblocks); | |
592 | to->sb_rblocks = be64_to_cpu(from->sb_rblocks); | |
593 | to->sb_rextents = be64_to_cpu(from->sb_rextents); | |
594 | memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); | |
595 | to->sb_logstart = be64_to_cpu(from->sb_logstart); | |
596 | to->sb_rootino = be64_to_cpu(from->sb_rootino); | |
597 | to->sb_rbmino = be64_to_cpu(from->sb_rbmino); | |
598 | to->sb_rsumino = be64_to_cpu(from->sb_rsumino); | |
599 | to->sb_rextsize = be32_to_cpu(from->sb_rextsize); | |
600 | to->sb_agblocks = be32_to_cpu(from->sb_agblocks); | |
601 | to->sb_agcount = be32_to_cpu(from->sb_agcount); | |
602 | to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); | |
603 | to->sb_logblocks = be32_to_cpu(from->sb_logblocks); | |
604 | to->sb_versionnum = be16_to_cpu(from->sb_versionnum); | |
605 | to->sb_sectsize = be16_to_cpu(from->sb_sectsize); | |
606 | to->sb_inodesize = be16_to_cpu(from->sb_inodesize); | |
607 | to->sb_inopblock = be16_to_cpu(from->sb_inopblock); | |
608 | memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); | |
609 | to->sb_blocklog = from->sb_blocklog; | |
610 | to->sb_sectlog = from->sb_sectlog; | |
611 | to->sb_inodelog = from->sb_inodelog; | |
612 | to->sb_inopblog = from->sb_inopblog; | |
613 | to->sb_agblklog = from->sb_agblklog; | |
614 | to->sb_rextslog = from->sb_rextslog; | |
615 | to->sb_inprogress = from->sb_inprogress; | |
616 | to->sb_imax_pct = from->sb_imax_pct; | |
617 | to->sb_icount = be64_to_cpu(from->sb_icount); | |
618 | to->sb_ifree = be64_to_cpu(from->sb_ifree); | |
619 | to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); | |
620 | to->sb_frextents = be64_to_cpu(from->sb_frextents); | |
621 | to->sb_uquotino = be64_to_cpu(from->sb_uquotino); | |
622 | to->sb_gquotino = be64_to_cpu(from->sb_gquotino); | |
623 | to->sb_qflags = be16_to_cpu(from->sb_qflags); | |
624 | to->sb_flags = from->sb_flags; | |
625 | to->sb_shared_vn = from->sb_shared_vn; | |
626 | to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); | |
627 | to->sb_unit = be32_to_cpu(from->sb_unit); | |
628 | to->sb_width = be32_to_cpu(from->sb_width); | |
629 | to->sb_dirblklog = from->sb_dirblklog; | |
630 | to->sb_logsectlog = from->sb_logsectlog; | |
631 | to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); | |
632 | to->sb_logsunit = be32_to_cpu(from->sb_logsunit); | |
633 | to->sb_features2 = be32_to_cpu(from->sb_features2); | |
ee1c0908 | 634 | to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); |
04a1e6c5 DC |
635 | to->sb_features_compat = be32_to_cpu(from->sb_features_compat); |
636 | to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); | |
637 | to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); | |
e721f504 DC |
638 | to->sb_features_log_incompat = |
639 | be32_to_cpu(from->sb_features_log_incompat); | |
640 | to->sb_pad = 0; | |
04a1e6c5 DC |
641 | to->sb_pquotino = be64_to_cpu(from->sb_pquotino); |
642 | to->sb_lsn = be64_to_cpu(from->sb_lsn); | |
2bdf7cd0 CH |
643 | } |
644 | ||
83e782e1 CS |
645 | static inline void |
646 | xfs_sb_quota_to_disk( | |
647 | xfs_dsb_t *to, | |
648 | xfs_sb_t *from, | |
649 | __int64_t *fields) | |
650 | { | |
651 | __uint16_t qflags = from->sb_qflags; | |
652 | ||
653 | if (*fields & XFS_SB_QFLAGS) { | |
654 | /* | |
655 | * The in-core version of sb_qflags do not have | |
656 | * XFS_OQUOTA_* flags, whereas the on-disk version | |
657 | * does. So, convert incore XFS_{PG}QUOTA_* flags | |
658 | * to on-disk XFS_OQUOTA_* flags. | |
659 | */ | |
660 | qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD | | |
661 | XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD); | |
662 | ||
663 | if (from->sb_qflags & | |
664 | (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD)) | |
665 | qflags |= XFS_OQUOTA_ENFD; | |
666 | if (from->sb_qflags & | |
667 | (XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) | |
668 | qflags |= XFS_OQUOTA_CHKD; | |
669 | to->sb_qflags = cpu_to_be16(qflags); | |
670 | *fields &= ~XFS_SB_QFLAGS; | |
671 | } | |
672 | } | |
673 | ||
1da177e4 | 674 | /* |
2bdf7cd0 | 675 | * Copy in core superblock to ondisk one. |
1da177e4 | 676 | * |
2bdf7cd0 | 677 | * The fields argument is mask of superblock fields to copy. |
1da177e4 LT |
678 | */ |
679 | void | |
2bdf7cd0 CH |
680 | xfs_sb_to_disk( |
681 | xfs_dsb_t *to, | |
682 | xfs_sb_t *from, | |
1da177e4 LT |
683 | __int64_t fields) |
684 | { | |
2bdf7cd0 CH |
685 | xfs_caddr_t to_ptr = (xfs_caddr_t)to; |
686 | xfs_caddr_t from_ptr = (xfs_caddr_t)from; | |
1da177e4 LT |
687 | xfs_sb_field_t f; |
688 | int first; | |
689 | int size; | |
690 | ||
1da177e4 | 691 | ASSERT(fields); |
1da177e4 LT |
692 | if (!fields) |
693 | return; | |
694 | ||
83e782e1 | 695 | xfs_sb_quota_to_disk(to, from, &fields); |
1da177e4 LT |
696 | while (fields) { |
697 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
698 | first = xfs_sb_info[f].offset; | |
699 | size = xfs_sb_info[f + 1].offset - first; | |
700 | ||
701 | ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); | |
702 | ||
703 | if (size == 1 || xfs_sb_info[f].type == 1) { | |
2bdf7cd0 | 704 | memcpy(to_ptr + first, from_ptr + first, size); |
1da177e4 LT |
705 | } else { |
706 | switch (size) { | |
707 | case 2: | |
2bdf7cd0 CH |
708 | *(__be16 *)(to_ptr + first) = |
709 | cpu_to_be16(*(__u16 *)(from_ptr + first)); | |
1da177e4 LT |
710 | break; |
711 | case 4: | |
2bdf7cd0 CH |
712 | *(__be32 *)(to_ptr + first) = |
713 | cpu_to_be32(*(__u32 *)(from_ptr + first)); | |
1da177e4 LT |
714 | break; |
715 | case 8: | |
2bdf7cd0 CH |
716 | *(__be64 *)(to_ptr + first) = |
717 | cpu_to_be64(*(__u64 *)(from_ptr + first)); | |
1da177e4 LT |
718 | break; |
719 | default: | |
720 | ASSERT(0); | |
721 | } | |
722 | } | |
723 | ||
724 | fields &= ~(1LL << f); | |
725 | } | |
726 | } | |
727 | ||
04a1e6c5 | 728 | static int |
612cfbfe | 729 | xfs_sb_verify( |
34510185 DC |
730 | struct xfs_buf *bp, |
731 | bool check_version) | |
98021821 DC |
732 | { |
733 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
734 | struct xfs_sb sb; | |
98021821 DC |
735 | |
736 | xfs_sb_from_disk(&sb, XFS_BUF_TO_SBP(bp)); | |
737 | ||
738 | /* | |
739 | * Only check the in progress field for the primary superblock as | |
740 | * mkfs.xfs doesn't clear it from secondary superblocks. | |
741 | */ | |
34510185 DC |
742 | return xfs_mount_validate_sb(mp, &sb, bp->b_bn == XFS_SB_DADDR, |
743 | check_version); | |
612cfbfe DC |
744 | } |
745 | ||
04a1e6c5 DC |
746 | /* |
747 | * If the superblock has the CRC feature bit set or the CRC field is non-null, | |
748 | * check that the CRC is valid. We check the CRC field is non-null because a | |
749 | * single bit error could clear the feature bit and unused parts of the | |
750 | * superblock are supposed to be zero. Hence a non-null crc field indicates that | |
751 | * we've potentially lost a feature bit and we should check it anyway. | |
752 | */ | |
1813dd64 | 753 | static void |
612cfbfe DC |
754 | xfs_sb_read_verify( |
755 | struct xfs_buf *bp) | |
756 | { | |
04a1e6c5 DC |
757 | struct xfs_mount *mp = bp->b_target->bt_mount; |
758 | struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); | |
759 | int error; | |
760 | ||
761 | /* | |
762 | * open code the version check to avoid needing to convert the entire | |
763 | * superblock from disk order just to check the version number | |
764 | */ | |
765 | if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC) && | |
766 | (((be16_to_cpu(dsb->sb_versionnum) & XFS_SB_VERSION_NUMBITS) == | |
767 | XFS_SB_VERSION_5) || | |
768 | dsb->sb_crc != 0)) { | |
769 | ||
770 | if (!xfs_verify_cksum(bp->b_addr, be16_to_cpu(dsb->sb_sectsize), | |
771 | offsetof(struct xfs_sb, sb_crc))) { | |
772 | error = EFSCORRUPTED; | |
773 | goto out_error; | |
774 | } | |
775 | } | |
34510185 | 776 | error = xfs_sb_verify(bp, true); |
04a1e6c5 DC |
777 | |
778 | out_error: | |
779 | if (error) { | |
780 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); | |
781 | xfs_buf_ioerror(bp, error); | |
782 | } | |
98021821 DC |
783 | } |
784 | ||
785 | /* | |
786 | * We may be probed for a filesystem match, so we may not want to emit | |
787 | * messages when the superblock buffer is not actually an XFS superblock. | |
788 | * If we find an XFS superblock, the run a normal, noisy mount because we are | |
789 | * really going to mount it and want to know about errors. | |
790 | */ | |
1813dd64 | 791 | static void |
98021821 DC |
792 | xfs_sb_quiet_read_verify( |
793 | struct xfs_buf *bp) | |
794 | { | |
04a1e6c5 | 795 | struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp); |
98021821 | 796 | |
98021821 | 797 | |
04a1e6c5 | 798 | if (dsb->sb_magicnum == cpu_to_be32(XFS_SB_MAGIC)) { |
98021821 DC |
799 | /* XFS filesystem, verify noisily! */ |
800 | xfs_sb_read_verify(bp); | |
801 | return; | |
802 | } | |
803 | /* quietly fail */ | |
aeb4f20a | 804 | xfs_buf_ioerror(bp, EWRONGFS); |
98021821 DC |
805 | } |
806 | ||
1813dd64 DC |
807 | static void |
808 | xfs_sb_write_verify( | |
04a1e6c5 | 809 | struct xfs_buf *bp) |
1813dd64 | 810 | { |
04a1e6c5 DC |
811 | struct xfs_mount *mp = bp->b_target->bt_mount; |
812 | struct xfs_buf_log_item *bip = bp->b_fspriv; | |
813 | int error; | |
814 | ||
34510185 | 815 | error = xfs_sb_verify(bp, false); |
04a1e6c5 DC |
816 | if (error) { |
817 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr); | |
818 | xfs_buf_ioerror(bp, error); | |
819 | return; | |
820 | } | |
821 | ||
822 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
823 | return; | |
824 | ||
825 | if (bip) | |
826 | XFS_BUF_TO_SBP(bp)->sb_lsn = cpu_to_be64(bip->bli_item.li_lsn); | |
827 | ||
828 | xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), | |
829 | offsetof(struct xfs_sb, sb_crc)); | |
1813dd64 DC |
830 | } |
831 | ||
832 | const struct xfs_buf_ops xfs_sb_buf_ops = { | |
833 | .verify_read = xfs_sb_read_verify, | |
834 | .verify_write = xfs_sb_write_verify, | |
835 | }; | |
836 | ||
837 | static const struct xfs_buf_ops xfs_sb_quiet_buf_ops = { | |
838 | .verify_read = xfs_sb_quiet_read_verify, | |
839 | .verify_write = xfs_sb_write_verify, | |
840 | }; | |
841 | ||
1da177e4 LT |
842 | /* |
843 | * xfs_readsb | |
844 | * | |
845 | * Does the initial read of the superblock. | |
846 | */ | |
847 | int | |
764d1f89 | 848 | xfs_readsb(xfs_mount_t *mp, int flags) |
1da177e4 LT |
849 | { |
850 | unsigned int sector_size; | |
04a1e6c5 DC |
851 | struct xfs_buf *bp; |
852 | struct xfs_sb *sbp = &mp->m_sb; | |
1da177e4 | 853 | int error; |
af34e09d | 854 | int loud = !(flags & XFS_MFSI_QUIET); |
1da177e4 LT |
855 | |
856 | ASSERT(mp->m_sb_bp == NULL); | |
857 | ASSERT(mp->m_ddev_targp != NULL); | |
858 | ||
859 | /* | |
860 | * Allocate a (locked) buffer to hold the superblock. | |
861 | * This will be kept around at all times to optimize | |
862 | * access to the superblock. | |
863 | */ | |
864 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); | |
26af6552 DC |
865 | |
866 | reread: | |
e70b73f8 | 867 | bp = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR, |
98021821 | 868 | BTOBB(sector_size), 0, |
1813dd64 DC |
869 | loud ? &xfs_sb_buf_ops |
870 | : &xfs_sb_quiet_buf_ops); | |
26af6552 | 871 | if (!bp) { |
af34e09d DC |
872 | if (loud) |
873 | xfs_warn(mp, "SB buffer read failed"); | |
26af6552 | 874 | return EIO; |
1da177e4 | 875 | } |
eab4e633 DC |
876 | if (bp->b_error) { |
877 | error = bp->b_error; | |
878 | if (loud) | |
e721f504 | 879 | xfs_warn(mp, "SB validate failed with error %d.", error); |
eab4e633 DC |
880 | goto release_buf; |
881 | } | |
1da177e4 LT |
882 | |
883 | /* | |
884 | * Initialize the mount structure from the superblock. | |
1da177e4 | 885 | */ |
98021821 | 886 | xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp)); |
1da177e4 | 887 | |
83e782e1 | 888 | xfs_sb_quota_from_disk(&mp->m_sb); |
1da177e4 LT |
889 | /* |
890 | * We must be able to do sector-sized and sector-aligned IO. | |
891 | */ | |
04a1e6c5 | 892 | if (sector_size > sbp->sb_sectsize) { |
af34e09d DC |
893 | if (loud) |
894 | xfs_warn(mp, "device supports %u byte sectors (not %u)", | |
04a1e6c5 | 895 | sector_size, sbp->sb_sectsize); |
1da177e4 | 896 | error = ENOSYS; |
26af6552 | 897 | goto release_buf; |
1da177e4 LT |
898 | } |
899 | ||
900 | /* | |
901 | * If device sector size is smaller than the superblock size, | |
902 | * re-read the superblock so the buffer is correctly sized. | |
903 | */ | |
04a1e6c5 | 904 | if (sector_size < sbp->sb_sectsize) { |
1da177e4 | 905 | xfs_buf_relse(bp); |
04a1e6c5 | 906 | sector_size = sbp->sb_sectsize; |
26af6552 | 907 | goto reread; |
1da177e4 LT |
908 | } |
909 | ||
5478eead LM |
910 | /* Initialize per-cpu counters */ |
911 | xfs_icsb_reinit_counters(mp); | |
8d280b98 | 912 | |
04a1e6c5 DC |
913 | /* no need to be quiet anymore, so reset the buf ops */ |
914 | bp->b_ops = &xfs_sb_buf_ops; | |
915 | ||
1da177e4 | 916 | mp->m_sb_bp = bp; |
26af6552 | 917 | xfs_buf_unlock(bp); |
1da177e4 LT |
918 | return 0; |
919 | ||
26af6552 DC |
920 | release_buf: |
921 | xfs_buf_relse(bp); | |
1da177e4 LT |
922 | return error; |
923 | } | |
924 | ||
925 | ||
926 | /* | |
927 | * xfs_mount_common | |
928 | * | |
929 | * Mount initialization code establishing various mount | |
930 | * fields from the superblock associated with the given | |
931 | * mount structure | |
932 | */ | |
ba0f32d4 | 933 | STATIC void |
1da177e4 LT |
934 | xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) |
935 | { | |
1da177e4 | 936 | mp->m_agfrotor = mp->m_agirotor = 0; |
007c61c6 | 937 | spin_lock_init(&mp->m_agirotor_lock); |
1da177e4 LT |
938 | mp->m_maxagi = mp->m_sb.sb_agcount; |
939 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
940 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
941 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
942 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
943 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
1da177e4 LT |
944 | mp->m_blockmask = sbp->sb_blocksize - 1; |
945 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
946 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
1da177e4 | 947 | |
60197e8d CH |
948 | mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); |
949 | mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
950 | mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; | |
951 | mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; | |
952 | ||
953 | mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1); | |
954 | mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0); | |
955 | mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2; | |
956 | mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2; | |
957 | ||
958 | mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); | |
959 | mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
960 | mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; | |
961 | mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; | |
1da177e4 LT |
962 | |
963 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
964 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
965 | sbp->sb_inopblock); | |
966 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
967 | } | |
92821e2b DC |
968 | |
969 | /* | |
970 | * xfs_initialize_perag_data | |
971 | * | |
972 | * Read in each per-ag structure so we can count up the number of | |
973 | * allocated inodes, free inodes and used filesystem blocks as this | |
974 | * information is no longer persistent in the superblock. Once we have | |
975 | * this information, write it into the in-core superblock structure. | |
976 | */ | |
977 | STATIC int | |
978 | xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount) | |
979 | { | |
980 | xfs_agnumber_t index; | |
981 | xfs_perag_t *pag; | |
982 | xfs_sb_t *sbp = &mp->m_sb; | |
983 | uint64_t ifree = 0; | |
984 | uint64_t ialloc = 0; | |
985 | uint64_t bfree = 0; | |
986 | uint64_t bfreelst = 0; | |
987 | uint64_t btree = 0; | |
988 | int error; | |
92821e2b DC |
989 | |
990 | for (index = 0; index < agcount; index++) { | |
991 | /* | |
992 | * read the agf, then the agi. This gets us | |
9da096fd | 993 | * all the information we need and populates the |
92821e2b DC |
994 | * per-ag structures for us. |
995 | */ | |
996 | error = xfs_alloc_pagf_init(mp, NULL, index, 0); | |
997 | if (error) | |
998 | return error; | |
999 | ||
1000 | error = xfs_ialloc_pagi_init(mp, NULL, index); | |
1001 | if (error) | |
1002 | return error; | |
44b56e0a | 1003 | pag = xfs_perag_get(mp, index); |
92821e2b DC |
1004 | ifree += pag->pagi_freecount; |
1005 | ialloc += pag->pagi_count; | |
1006 | bfree += pag->pagf_freeblks; | |
1007 | bfreelst += pag->pagf_flcount; | |
1008 | btree += pag->pagf_btreeblks; | |
44b56e0a | 1009 | xfs_perag_put(pag); |
92821e2b DC |
1010 | } |
1011 | /* | |
1012 | * Overwrite incore superblock counters with just-read data | |
1013 | */ | |
3685c2a1 | 1014 | spin_lock(&mp->m_sb_lock); |
92821e2b DC |
1015 | sbp->sb_ifree = ifree; |
1016 | sbp->sb_icount = ialloc; | |
1017 | sbp->sb_fdblocks = bfree + bfreelst + btree; | |
3685c2a1 | 1018 | spin_unlock(&mp->m_sb_lock); |
92821e2b DC |
1019 | |
1020 | /* Fixup the per-cpu counters as well. */ | |
1021 | xfs_icsb_reinit_counters(mp); | |
1022 | ||
1023 | return 0; | |
1024 | } | |
1025 | ||
1da177e4 | 1026 | /* |
0771fb45 | 1027 | * Update alignment values based on mount options and sb values |
1da177e4 | 1028 | */ |
0771fb45 | 1029 | STATIC int |
7884bc86 | 1030 | xfs_update_alignment(xfs_mount_t *mp) |
1da177e4 | 1031 | { |
1da177e4 | 1032 | xfs_sb_t *sbp = &(mp->m_sb); |
1da177e4 | 1033 | |
4249023a | 1034 | if (mp->m_dalign) { |
1da177e4 LT |
1035 | /* |
1036 | * If stripe unit and stripe width are not multiples | |
1037 | * of the fs blocksize turn off alignment. | |
1038 | */ | |
1039 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || | |
1040 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { | |
39a45d84 JL |
1041 | xfs_warn(mp, |
1042 | "alignment check failed: sunit/swidth vs. blocksize(%d)", | |
1043 | sbp->sb_blocksize); | |
1044 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
1045 | } else { |
1046 | /* | |
1047 | * Convert the stripe unit and width to FSBs. | |
1048 | */ | |
1049 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); | |
1050 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { | |
53487786 | 1051 | xfs_warn(mp, |
39a45d84 JL |
1052 | "alignment check failed: sunit/swidth vs. agsize(%d)", |
1053 | sbp->sb_agblocks); | |
1054 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
1055 | } else if (mp->m_dalign) { |
1056 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); | |
1057 | } else { | |
39a45d84 JL |
1058 | xfs_warn(mp, |
1059 | "alignment check failed: sunit(%d) less than bsize(%d)", | |
1060 | mp->m_dalign, sbp->sb_blocksize); | |
1061 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
1062 | } |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * Update superblock with new values | |
1067 | * and log changes | |
1068 | */ | |
62118709 | 1069 | if (xfs_sb_version_hasdalign(sbp)) { |
1da177e4 LT |
1070 | if (sbp->sb_unit != mp->m_dalign) { |
1071 | sbp->sb_unit = mp->m_dalign; | |
7884bc86 | 1072 | mp->m_update_flags |= XFS_SB_UNIT; |
1da177e4 LT |
1073 | } |
1074 | if (sbp->sb_width != mp->m_swidth) { | |
1075 | sbp->sb_width = mp->m_swidth; | |
7884bc86 | 1076 | mp->m_update_flags |= XFS_SB_WIDTH; |
1da177e4 | 1077 | } |
34d7f603 JL |
1078 | } else { |
1079 | xfs_warn(mp, | |
1080 | "cannot change alignment: superblock does not support data alignment"); | |
1081 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
1082 | } |
1083 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && | |
62118709 | 1084 | xfs_sb_version_hasdalign(&mp->m_sb)) { |
1da177e4 LT |
1085 | mp->m_dalign = sbp->sb_unit; |
1086 | mp->m_swidth = sbp->sb_width; | |
1087 | } | |
1088 | ||
0771fb45 ES |
1089 | return 0; |
1090 | } | |
1da177e4 | 1091 | |
0771fb45 ES |
1092 | /* |
1093 | * Set the maximum inode count for this filesystem | |
1094 | */ | |
1095 | STATIC void | |
1096 | xfs_set_maxicount(xfs_mount_t *mp) | |
1097 | { | |
1098 | xfs_sb_t *sbp = &(mp->m_sb); | |
1099 | __uint64_t icount; | |
1da177e4 | 1100 | |
0771fb45 ES |
1101 | if (sbp->sb_imax_pct) { |
1102 | /* | |
1103 | * Make sure the maximum inode count is a multiple | |
1104 | * of the units we allocate inodes in. | |
1da177e4 | 1105 | */ |
1da177e4 LT |
1106 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; |
1107 | do_div(icount, 100); | |
1108 | do_div(icount, mp->m_ialloc_blks); | |
1109 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << | |
1110 | sbp->sb_inopblog; | |
0771fb45 | 1111 | } else { |
1da177e4 | 1112 | mp->m_maxicount = 0; |
1da177e4 | 1113 | } |
0771fb45 ES |
1114 | } |
1115 | ||
1116 | /* | |
1117 | * Set the default minimum read and write sizes unless | |
1118 | * already specified in a mount option. | |
1119 | * We use smaller I/O sizes when the file system | |
1120 | * is being used for NFS service (wsync mount option). | |
1121 | */ | |
1122 | STATIC void | |
1123 | xfs_set_rw_sizes(xfs_mount_t *mp) | |
1124 | { | |
1125 | xfs_sb_t *sbp = &(mp->m_sb); | |
1126 | int readio_log, writeio_log; | |
1da177e4 | 1127 | |
1da177e4 LT |
1128 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { |
1129 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
1130 | readio_log = XFS_WSYNC_READIO_LOG; | |
1131 | writeio_log = XFS_WSYNC_WRITEIO_LOG; | |
1132 | } else { | |
1133 | readio_log = XFS_READIO_LOG_LARGE; | |
1134 | writeio_log = XFS_WRITEIO_LOG_LARGE; | |
1135 | } | |
1136 | } else { | |
1137 | readio_log = mp->m_readio_log; | |
1138 | writeio_log = mp->m_writeio_log; | |
1139 | } | |
1140 | ||
1da177e4 LT |
1141 | if (sbp->sb_blocklog > readio_log) { |
1142 | mp->m_readio_log = sbp->sb_blocklog; | |
1143 | } else { | |
1144 | mp->m_readio_log = readio_log; | |
1145 | } | |
1146 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); | |
1147 | if (sbp->sb_blocklog > writeio_log) { | |
1148 | mp->m_writeio_log = sbp->sb_blocklog; | |
1149 | } else { | |
1150 | mp->m_writeio_log = writeio_log; | |
1151 | } | |
1152 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); | |
0771fb45 | 1153 | } |
1da177e4 | 1154 | |
055388a3 DC |
1155 | /* |
1156 | * precalculate the low space thresholds for dynamic speculative preallocation. | |
1157 | */ | |
1158 | void | |
1159 | xfs_set_low_space_thresholds( | |
1160 | struct xfs_mount *mp) | |
1161 | { | |
1162 | int i; | |
1163 | ||
1164 | for (i = 0; i < XFS_LOWSP_MAX; i++) { | |
1165 | __uint64_t space = mp->m_sb.sb_dblocks; | |
1166 | ||
1167 | do_div(space, 100); | |
1168 | mp->m_low_space[i] = space * (i + 1); | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | ||
0771fb45 ES |
1173 | /* |
1174 | * Set whether we're using inode alignment. | |
1175 | */ | |
1176 | STATIC void | |
1177 | xfs_set_inoalignment(xfs_mount_t *mp) | |
1178 | { | |
62118709 | 1179 | if (xfs_sb_version_hasalign(&mp->m_sb) && |
1da177e4 LT |
1180 | mp->m_sb.sb_inoalignmt >= |
1181 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) | |
1182 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; | |
1183 | else | |
1184 | mp->m_inoalign_mask = 0; | |
1185 | /* | |
1186 | * If we are using stripe alignment, check whether | |
1187 | * the stripe unit is a multiple of the inode alignment | |
1188 | */ | |
1189 | if (mp->m_dalign && mp->m_inoalign_mask && | |
1190 | !(mp->m_dalign & mp->m_inoalign_mask)) | |
1191 | mp->m_sinoalign = mp->m_dalign; | |
1192 | else | |
1193 | mp->m_sinoalign = 0; | |
0771fb45 ES |
1194 | } |
1195 | ||
1196 | /* | |
1197 | * Check that the data (and log if separate) are an ok size. | |
1198 | */ | |
1199 | STATIC int | |
4249023a | 1200 | xfs_check_sizes(xfs_mount_t *mp) |
0771fb45 ES |
1201 | { |
1202 | xfs_buf_t *bp; | |
1203 | xfs_daddr_t d; | |
0771fb45 | 1204 | |
1da177e4 LT |
1205 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); |
1206 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { | |
0b932ccc | 1207 | xfs_warn(mp, "filesystem size mismatch detected"); |
657a4cff | 1208 | return XFS_ERROR(EFBIG); |
1da177e4 | 1209 | } |
e70b73f8 | 1210 | bp = xfs_buf_read_uncached(mp->m_ddev_targp, |
1922c949 | 1211 | d - XFS_FSS_TO_BB(mp, 1), |
c3f8fc73 | 1212 | XFS_FSS_TO_BB(mp, 1), 0, NULL); |
1922c949 | 1213 | if (!bp) { |
0b932ccc | 1214 | xfs_warn(mp, "last sector read failed"); |
1922c949 | 1215 | return EIO; |
1da177e4 | 1216 | } |
1922c949 | 1217 | xfs_buf_relse(bp); |
1da177e4 | 1218 | |
4249023a | 1219 | if (mp->m_logdev_targp != mp->m_ddev_targp) { |
1da177e4 LT |
1220 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); |
1221 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { | |
0b932ccc | 1222 | xfs_warn(mp, "log size mismatch detected"); |
657a4cff | 1223 | return XFS_ERROR(EFBIG); |
1da177e4 | 1224 | } |
e70b73f8 | 1225 | bp = xfs_buf_read_uncached(mp->m_logdev_targp, |
1922c949 | 1226 | d - XFS_FSB_TO_BB(mp, 1), |
c3f8fc73 | 1227 | XFS_FSB_TO_BB(mp, 1), 0, NULL); |
1922c949 | 1228 | if (!bp) { |
0b932ccc | 1229 | xfs_warn(mp, "log device read failed"); |
1922c949 | 1230 | return EIO; |
0771fb45 | 1231 | } |
1922c949 | 1232 | xfs_buf_relse(bp); |
0771fb45 ES |
1233 | } |
1234 | return 0; | |
1235 | } | |
1236 | ||
7d095257 CH |
1237 | /* |
1238 | * Clear the quotaflags in memory and in the superblock. | |
1239 | */ | |
1240 | int | |
1241 | xfs_mount_reset_sbqflags( | |
1242 | struct xfs_mount *mp) | |
1243 | { | |
1244 | int error; | |
1245 | struct xfs_trans *tp; | |
1246 | ||
1247 | mp->m_qflags = 0; | |
1248 | ||
1249 | /* | |
1250 | * It is OK to look at sb_qflags here in mount path, | |
1251 | * without m_sb_lock. | |
1252 | */ | |
1253 | if (mp->m_sb.sb_qflags == 0) | |
1254 | return 0; | |
1255 | spin_lock(&mp->m_sb_lock); | |
1256 | mp->m_sb.sb_qflags = 0; | |
1257 | spin_unlock(&mp->m_sb_lock); | |
1258 | ||
1259 | /* | |
1260 | * If the fs is readonly, let the incore superblock run | |
1261 | * with quotas off but don't flush the update out to disk | |
1262 | */ | |
1263 | if (mp->m_flags & XFS_MOUNT_RDONLY) | |
1264 | return 0; | |
1265 | ||
7d095257 | 1266 | tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE); |
b0c10b98 JL |
1267 | error = xfs_trans_reserve(tp, 0, XFS_QM_SBCHANGE_LOG_RES(mp), |
1268 | 0, 0, XFS_DEFAULT_LOG_COUNT); | |
7d095257 CH |
1269 | if (error) { |
1270 | xfs_trans_cancel(tp, 0); | |
53487786 | 1271 | xfs_alert(mp, "%s: Superblock update failed!", __func__); |
7d095257 CH |
1272 | return error; |
1273 | } | |
1274 | ||
1275 | xfs_mod_sb(tp, XFS_SB_QFLAGS); | |
1276 | return xfs_trans_commit(tp, 0); | |
1277 | } | |
1278 | ||
d5db0f97 ES |
1279 | __uint64_t |
1280 | xfs_default_resblks(xfs_mount_t *mp) | |
1281 | { | |
1282 | __uint64_t resblks; | |
1283 | ||
1284 | /* | |
8babd8a2 DC |
1285 | * We default to 5% or 8192 fsbs of space reserved, whichever is |
1286 | * smaller. This is intended to cover concurrent allocation | |
1287 | * transactions when we initially hit enospc. These each require a 4 | |
1288 | * block reservation. Hence by default we cover roughly 2000 concurrent | |
1289 | * allocation reservations. | |
d5db0f97 ES |
1290 | */ |
1291 | resblks = mp->m_sb.sb_dblocks; | |
1292 | do_div(resblks, 20); | |
8babd8a2 | 1293 | resblks = min_t(__uint64_t, resblks, 8192); |
d5db0f97 ES |
1294 | return resblks; |
1295 | } | |
1296 | ||
0771fb45 | 1297 | /* |
0771fb45 ES |
1298 | * This function does the following on an initial mount of a file system: |
1299 | * - reads the superblock from disk and init the mount struct | |
1300 | * - if we're a 32-bit kernel, do a size check on the superblock | |
1301 | * so we don't mount terabyte filesystems | |
1302 | * - init mount struct realtime fields | |
1303 | * - allocate inode hash table for fs | |
1304 | * - init directory manager | |
1305 | * - perform recovery and init the log manager | |
1306 | */ | |
1307 | int | |
1308 | xfs_mountfs( | |
4249023a | 1309 | xfs_mount_t *mp) |
0771fb45 ES |
1310 | { |
1311 | xfs_sb_t *sbp = &(mp->m_sb); | |
1312 | xfs_inode_t *rip; | |
0771fb45 | 1313 | __uint64_t resblks; |
7d095257 CH |
1314 | uint quotamount = 0; |
1315 | uint quotaflags = 0; | |
0771fb45 ES |
1316 | int error = 0; |
1317 | ||
0771fb45 ES |
1318 | xfs_mount_common(mp, sbp); |
1319 | ||
ee1c0908 | 1320 | /* |
e6957ea4 ES |
1321 | * Check for a mismatched features2 values. Older kernels |
1322 | * read & wrote into the wrong sb offset for sb_features2 | |
1323 | * on some platforms due to xfs_sb_t not being 64bit size aligned | |
1324 | * when sb_features2 was added, which made older superblock | |
1325 | * reading/writing routines swap it as a 64-bit value. | |
ee1c0908 | 1326 | * |
e6957ea4 ES |
1327 | * For backwards compatibility, we make both slots equal. |
1328 | * | |
1329 | * If we detect a mismatched field, we OR the set bits into the | |
1330 | * existing features2 field in case it has already been modified; we | |
1331 | * don't want to lose any features. We then update the bad location | |
1332 | * with the ORed value so that older kernels will see any features2 | |
1333 | * flags, and mark the two fields as needing updates once the | |
1334 | * transaction subsystem is online. | |
ee1c0908 | 1335 | */ |
e6957ea4 | 1336 | if (xfs_sb_has_mismatched_features2(sbp)) { |
0b932ccc | 1337 | xfs_warn(mp, "correcting sb_features alignment problem"); |
ee1c0908 | 1338 | sbp->sb_features2 |= sbp->sb_bad_features2; |
e6957ea4 | 1339 | sbp->sb_bad_features2 = sbp->sb_features2; |
7884bc86 | 1340 | mp->m_update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2; |
e6957ea4 ES |
1341 | |
1342 | /* | |
1343 | * Re-check for ATTR2 in case it was found in bad_features2 | |
1344 | * slot. | |
1345 | */ | |
7c12f296 TS |
1346 | if (xfs_sb_version_hasattr2(&mp->m_sb) && |
1347 | !(mp->m_flags & XFS_MOUNT_NOATTR2)) | |
e6957ea4 | 1348 | mp->m_flags |= XFS_MOUNT_ATTR2; |
7c12f296 TS |
1349 | } |
1350 | ||
1351 | if (xfs_sb_version_hasattr2(&mp->m_sb) && | |
1352 | (mp->m_flags & XFS_MOUNT_NOATTR2)) { | |
1353 | xfs_sb_version_removeattr2(&mp->m_sb); | |
7884bc86 | 1354 | mp->m_update_flags |= XFS_SB_FEATURES2; |
e6957ea4 | 1355 | |
7c12f296 TS |
1356 | /* update sb_versionnum for the clearing of the morebits */ |
1357 | if (!sbp->sb_features2) | |
7884bc86 | 1358 | mp->m_update_flags |= XFS_SB_VERSIONNUM; |
ee1c0908 DC |
1359 | } |
1360 | ||
0771fb45 ES |
1361 | /* |
1362 | * Check if sb_agblocks is aligned at stripe boundary | |
1363 | * If sb_agblocks is NOT aligned turn off m_dalign since | |
1364 | * allocator alignment is within an ag, therefore ag has | |
1365 | * to be aligned at stripe boundary. | |
1366 | */ | |
7884bc86 | 1367 | error = xfs_update_alignment(mp); |
0771fb45 | 1368 | if (error) |
f9057e3d | 1369 | goto out; |
0771fb45 ES |
1370 | |
1371 | xfs_alloc_compute_maxlevels(mp); | |
1372 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); | |
1373 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); | |
1374 | xfs_ialloc_compute_maxlevels(mp); | |
1375 | ||
1376 | xfs_set_maxicount(mp); | |
1377 | ||
27174203 CH |
1378 | error = xfs_uuid_mount(mp); |
1379 | if (error) | |
1380 | goto out; | |
1da177e4 | 1381 | |
0771fb45 ES |
1382 | /* |
1383 | * Set the minimum read and write sizes | |
1384 | */ | |
1385 | xfs_set_rw_sizes(mp); | |
1386 | ||
055388a3 DC |
1387 | /* set the low space thresholds for dynamic preallocation */ |
1388 | xfs_set_low_space_thresholds(mp); | |
1389 | ||
0771fb45 ES |
1390 | /* |
1391 | * Set the inode cluster size. | |
1392 | * This may still be overridden by the file system | |
1393 | * block size if it is larger than the chosen cluster size. | |
1394 | */ | |
1395 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; | |
1396 | ||
1397 | /* | |
1398 | * Set inode alignment fields | |
1399 | */ | |
1400 | xfs_set_inoalignment(mp); | |
1401 | ||
1402 | /* | |
1403 | * Check that the data (and log if separate) are an ok size. | |
1404 | */ | |
4249023a | 1405 | error = xfs_check_sizes(mp); |
0771fb45 | 1406 | if (error) |
f9057e3d | 1407 | goto out_remove_uuid; |
0771fb45 | 1408 | |
1da177e4 LT |
1409 | /* |
1410 | * Initialize realtime fields in the mount structure | |
1411 | */ | |
0771fb45 ES |
1412 | error = xfs_rtmount_init(mp); |
1413 | if (error) { | |
0b932ccc | 1414 | xfs_warn(mp, "RT mount failed"); |
f9057e3d | 1415 | goto out_remove_uuid; |
1da177e4 LT |
1416 | } |
1417 | ||
1da177e4 LT |
1418 | /* |
1419 | * Copies the low order bits of the timestamp and the randomly | |
1420 | * set "sequence" number out of a UUID. | |
1421 | */ | |
1422 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); | |
1423 | ||
1da177e4 LT |
1424 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ |
1425 | ||
f6c2d1fa | 1426 | xfs_dir_mount(mp); |
1da177e4 LT |
1427 | |
1428 | /* | |
1429 | * Initialize the attribute manager's entries. | |
1430 | */ | |
1431 | mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; | |
1432 | ||
1433 | /* | |
1434 | * Initialize the precomputed transaction reservations values. | |
1435 | */ | |
1436 | xfs_trans_init(mp); | |
1437 | ||
1da177e4 LT |
1438 | /* |
1439 | * Allocate and initialize the per-ag data. | |
1440 | */ | |
1c1c6ebc | 1441 | spin_lock_init(&mp->m_perag_lock); |
9b98b6f3 | 1442 | INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC); |
1c1c6ebc DC |
1443 | error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi); |
1444 | if (error) { | |
0b932ccc | 1445 | xfs_warn(mp, "Failed per-ag init: %d", error); |
f9057e3d | 1446 | goto out_remove_uuid; |
1c1c6ebc | 1447 | } |
1da177e4 | 1448 | |
f9057e3d | 1449 | if (!sbp->sb_logblocks) { |
0b932ccc | 1450 | xfs_warn(mp, "no log defined"); |
f9057e3d CH |
1451 | XFS_ERROR_REPORT("xfs_mountfs", XFS_ERRLEVEL_LOW, mp); |
1452 | error = XFS_ERROR(EFSCORRUPTED); | |
1453 | goto out_free_perag; | |
1454 | } | |
1455 | ||
1da177e4 LT |
1456 | /* |
1457 | * log's mount-time initialization. Perform 1st part recovery if needed | |
1458 | */ | |
f9057e3d CH |
1459 | error = xfs_log_mount(mp, mp->m_logdev_targp, |
1460 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), | |
1461 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); | |
1462 | if (error) { | |
0b932ccc | 1463 | xfs_warn(mp, "log mount failed"); |
d4f3512b | 1464 | goto out_fail_wait; |
1da177e4 LT |
1465 | } |
1466 | ||
92821e2b DC |
1467 | /* |
1468 | * Now the log is mounted, we know if it was an unclean shutdown or | |
1469 | * not. If it was, with the first phase of recovery has completed, we | |
1470 | * have consistent AG blocks on disk. We have not recovered EFIs yet, | |
1471 | * but they are recovered transactionally in the second recovery phase | |
1472 | * later. | |
1473 | * | |
1474 | * Hence we can safely re-initialise incore superblock counters from | |
1475 | * the per-ag data. These may not be correct if the filesystem was not | |
1476 | * cleanly unmounted, so we need to wait for recovery to finish before | |
1477 | * doing this. | |
1478 | * | |
1479 | * If the filesystem was cleanly unmounted, then we can trust the | |
1480 | * values in the superblock to be correct and we don't need to do | |
1481 | * anything here. | |
1482 | * | |
1483 | * If we are currently making the filesystem, the initialisation will | |
1484 | * fail as the perag data is in an undefined state. | |
1485 | */ | |
92821e2b DC |
1486 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && |
1487 | !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) && | |
1488 | !mp->m_sb.sb_inprogress) { | |
1489 | error = xfs_initialize_perag_data(mp, sbp->sb_agcount); | |
f9057e3d | 1490 | if (error) |
d4f3512b | 1491 | goto out_fail_wait; |
92821e2b | 1492 | } |
f9057e3d | 1493 | |
1da177e4 LT |
1494 | /* |
1495 | * Get and sanity-check the root inode. | |
1496 | * Save the pointer to it in the mount structure. | |
1497 | */ | |
7b6259e7 | 1498 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip); |
1da177e4 | 1499 | if (error) { |
0b932ccc | 1500 | xfs_warn(mp, "failed to read root inode"); |
f9057e3d | 1501 | goto out_log_dealloc; |
1da177e4 LT |
1502 | } |
1503 | ||
1504 | ASSERT(rip != NULL); | |
1da177e4 | 1505 | |
abbede1b | 1506 | if (unlikely(!S_ISDIR(rip->i_d.di_mode))) { |
0b932ccc | 1507 | xfs_warn(mp, "corrupted root inode %llu: not a directory", |
b6574520 | 1508 | (unsigned long long)rip->i_ino); |
1da177e4 LT |
1509 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
1510 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, | |
1511 | mp); | |
1512 | error = XFS_ERROR(EFSCORRUPTED); | |
f9057e3d | 1513 | goto out_rele_rip; |
1da177e4 LT |
1514 | } |
1515 | mp->m_rootip = rip; /* save it */ | |
1516 | ||
1517 | xfs_iunlock(rip, XFS_ILOCK_EXCL); | |
1518 | ||
1519 | /* | |
1520 | * Initialize realtime inode pointers in the mount structure | |
1521 | */ | |
0771fb45 ES |
1522 | error = xfs_rtmount_inodes(mp); |
1523 | if (error) { | |
1da177e4 LT |
1524 | /* |
1525 | * Free up the root inode. | |
1526 | */ | |
0b932ccc | 1527 | xfs_warn(mp, "failed to read RT inodes"); |
f9057e3d | 1528 | goto out_rele_rip; |
1da177e4 LT |
1529 | } |
1530 | ||
1531 | /* | |
7884bc86 CH |
1532 | * If this is a read-only mount defer the superblock updates until |
1533 | * the next remount into writeable mode. Otherwise we would never | |
1534 | * perform the update e.g. for the root filesystem. | |
1da177e4 | 1535 | */ |
7884bc86 CH |
1536 | if (mp->m_update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) { |
1537 | error = xfs_mount_log_sb(mp, mp->m_update_flags); | |
e5720eec | 1538 | if (error) { |
0b932ccc | 1539 | xfs_warn(mp, "failed to write sb changes"); |
b93b6e43 | 1540 | goto out_rtunmount; |
e5720eec DC |
1541 | } |
1542 | } | |
1da177e4 LT |
1543 | |
1544 | /* | |
1545 | * Initialise the XFS quota management subsystem for this mount | |
1546 | */ | |
7d095257 CH |
1547 | if (XFS_IS_QUOTA_RUNNING(mp)) { |
1548 | error = xfs_qm_newmount(mp, "amount, "aflags); | |
1549 | if (error) | |
1550 | goto out_rtunmount; | |
1551 | } else { | |
1552 | ASSERT(!XFS_IS_QUOTA_ON(mp)); | |
1553 | ||
1554 | /* | |
1555 | * If a file system had quotas running earlier, but decided to | |
1556 | * mount without -o uquota/pquota/gquota options, revoke the | |
1557 | * quotachecked license. | |
1558 | */ | |
1559 | if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) { | |
0b932ccc | 1560 | xfs_notice(mp, "resetting quota flags"); |
7d095257 CH |
1561 | error = xfs_mount_reset_sbqflags(mp); |
1562 | if (error) | |
1563 | return error; | |
1564 | } | |
1565 | } | |
1da177e4 LT |
1566 | |
1567 | /* | |
1568 | * Finish recovering the file system. This part needed to be | |
1569 | * delayed until after the root and real-time bitmap inodes | |
1570 | * were consistently read in. | |
1571 | */ | |
4249023a | 1572 | error = xfs_log_mount_finish(mp); |
1da177e4 | 1573 | if (error) { |
0b932ccc | 1574 | xfs_warn(mp, "log mount finish failed"); |
b93b6e43 | 1575 | goto out_rtunmount; |
1da177e4 LT |
1576 | } |
1577 | ||
1578 | /* | |
1579 | * Complete the quota initialisation, post-log-replay component. | |
1580 | */ | |
7d095257 CH |
1581 | if (quotamount) { |
1582 | ASSERT(mp->m_qflags == 0); | |
1583 | mp->m_qflags = quotaflags; | |
1584 | ||
1585 | xfs_qm_mount_quotas(mp); | |
1586 | } | |
1587 | ||
84e1e99f DC |
1588 | /* |
1589 | * Now we are mounted, reserve a small amount of unused space for | |
1590 | * privileged transactions. This is needed so that transaction | |
1591 | * space required for critical operations can dip into this pool | |
1592 | * when at ENOSPC. This is needed for operations like create with | |
1593 | * attr, unwritten extent conversion at ENOSPC, etc. Data allocations | |
1594 | * are not allowed to use this reserved space. | |
8babd8a2 DC |
1595 | * |
1596 | * This may drive us straight to ENOSPC on mount, but that implies | |
1597 | * we were already there on the last unmount. Warn if this occurs. | |
84e1e99f | 1598 | */ |
d5db0f97 ES |
1599 | if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { |
1600 | resblks = xfs_default_resblks(mp); | |
1601 | error = xfs_reserve_blocks(mp, &resblks, NULL); | |
1602 | if (error) | |
0b932ccc DC |
1603 | xfs_warn(mp, |
1604 | "Unable to allocate reserve blocks. Continuing without reserve pool."); | |
d5db0f97 | 1605 | } |
84e1e99f | 1606 | |
1da177e4 LT |
1607 | return 0; |
1608 | ||
b93b6e43 CH |
1609 | out_rtunmount: |
1610 | xfs_rtunmount_inodes(mp); | |
f9057e3d | 1611 | out_rele_rip: |
43355099 | 1612 | IRELE(rip); |
f9057e3d | 1613 | out_log_dealloc: |
21b699c8 | 1614 | xfs_log_unmount(mp); |
d4f3512b DC |
1615 | out_fail_wait: |
1616 | if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) | |
1617 | xfs_wait_buftarg(mp->m_logdev_targp); | |
1618 | xfs_wait_buftarg(mp->m_ddev_targp); | |
f9057e3d | 1619 | out_free_perag: |
ff4f038c | 1620 | xfs_free_perag(mp); |
f9057e3d | 1621 | out_remove_uuid: |
27174203 | 1622 | xfs_uuid_unmount(mp); |
f9057e3d | 1623 | out: |
1da177e4 LT |
1624 | return error; |
1625 | } | |
1626 | ||
1627 | /* | |
1da177e4 LT |
1628 | * This flushes out the inodes,dquots and the superblock, unmounts the |
1629 | * log and makes sure that incore structures are freed. | |
1630 | */ | |
41b5c2e7 CH |
1631 | void |
1632 | xfs_unmountfs( | |
1633 | struct xfs_mount *mp) | |
1da177e4 | 1634 | { |
41b5c2e7 CH |
1635 | __uint64_t resblks; |
1636 | int error; | |
1da177e4 | 1637 | |
579b62fa BF |
1638 | cancel_delayed_work_sync(&mp->m_eofblocks_work); |
1639 | ||
7d095257 | 1640 | xfs_qm_unmount_quotas(mp); |
b93b6e43 | 1641 | xfs_rtunmount_inodes(mp); |
77508ec8 CH |
1642 | IRELE(mp->m_rootip); |
1643 | ||
641c56fb DC |
1644 | /* |
1645 | * We can potentially deadlock here if we have an inode cluster | |
9da096fd | 1646 | * that has been freed has its buffer still pinned in memory because |
641c56fb DC |
1647 | * the transaction is still sitting in a iclog. The stale inodes |
1648 | * on that buffer will have their flush locks held until the | |
1649 | * transaction hits the disk and the callbacks run. the inode | |
1650 | * flush takes the flush lock unconditionally and with nothing to | |
1651 | * push out the iclog we will never get that unlocked. hence we | |
1652 | * need to force the log first. | |
1653 | */ | |
a14a348b | 1654 | xfs_log_force(mp, XFS_LOG_SYNC); |
c854363e DC |
1655 | |
1656 | /* | |
211e4d43 CH |
1657 | * Flush all pending changes from the AIL. |
1658 | */ | |
1659 | xfs_ail_push_all_sync(mp->m_ail); | |
1660 | ||
1661 | /* | |
1662 | * And reclaim all inodes. At this point there should be no dirty | |
7e18530b DC |
1663 | * inodes and none should be pinned or locked, but use synchronous |
1664 | * reclaim just to be sure. We can stop background inode reclaim | |
1665 | * here as well if it is still running. | |
c854363e | 1666 | */ |
7e18530b | 1667 | cancel_delayed_work_sync(&mp->m_reclaim_work); |
c854363e | 1668 | xfs_reclaim_inodes(mp, SYNC_WAIT); |
1da177e4 | 1669 | |
7d095257 | 1670 | xfs_qm_unmount(mp); |
a357a121 | 1671 | |
84e1e99f DC |
1672 | /* |
1673 | * Unreserve any blocks we have so that when we unmount we don't account | |
1674 | * the reserved free space as used. This is really only necessary for | |
1675 | * lazy superblock counting because it trusts the incore superblock | |
9da096fd | 1676 | * counters to be absolutely correct on clean unmount. |
84e1e99f DC |
1677 | * |
1678 | * We don't bother correcting this elsewhere for lazy superblock | |
1679 | * counting because on mount of an unclean filesystem we reconstruct the | |
1680 | * correct counter value and this is irrelevant. | |
1681 | * | |
1682 | * For non-lazy counter filesystems, this doesn't matter at all because | |
1683 | * we only every apply deltas to the superblock and hence the incore | |
1684 | * value does not matter.... | |
1685 | */ | |
1686 | resblks = 0; | |
714082bc DC |
1687 | error = xfs_reserve_blocks(mp, &resblks, NULL); |
1688 | if (error) | |
0b932ccc | 1689 | xfs_warn(mp, "Unable to free reserved block pool. " |
714082bc DC |
1690 | "Freespace may not be correct on next mount."); |
1691 | ||
adab0f67 | 1692 | error = xfs_log_sbcount(mp); |
e5720eec | 1693 | if (error) |
0b932ccc | 1694 | xfs_warn(mp, "Unable to update superblock counters. " |
e5720eec | 1695 | "Freespace may not be correct on next mount."); |
87c7bec7 | 1696 | |
21b699c8 | 1697 | xfs_log_unmount(mp); |
27174203 | 1698 | xfs_uuid_unmount(mp); |
1da177e4 | 1699 | |
1550d0b0 | 1700 | #if defined(DEBUG) |
0ce4cfd4 | 1701 | xfs_errortag_clearall(mp, 0); |
1da177e4 | 1702 | #endif |
ff4f038c | 1703 | xfs_free_perag(mp); |
1da177e4 LT |
1704 | } |
1705 | ||
92821e2b DC |
1706 | int |
1707 | xfs_fs_writable(xfs_mount_t *mp) | |
1708 | { | |
d9457dc0 | 1709 | return !(mp->m_super->s_writers.frozen || XFS_FORCED_SHUTDOWN(mp) || |
bd186aa9 | 1710 | (mp->m_flags & XFS_MOUNT_RDONLY)); |
92821e2b DC |
1711 | } |
1712 | ||
1713 | /* | |
b2ce3974 AE |
1714 | * xfs_log_sbcount |
1715 | * | |
adab0f67 | 1716 | * Sync the superblock counters to disk. |
b2ce3974 AE |
1717 | * |
1718 | * Note this code can be called during the process of freezing, so | |
adab0f67 | 1719 | * we may need to use the transaction allocator which does not |
b2ce3974 | 1720 | * block when the transaction subsystem is in its frozen state. |
92821e2b DC |
1721 | */ |
1722 | int | |
adab0f67 | 1723 | xfs_log_sbcount(xfs_mount_t *mp) |
92821e2b DC |
1724 | { |
1725 | xfs_trans_t *tp; | |
1726 | int error; | |
1727 | ||
1728 | if (!xfs_fs_writable(mp)) | |
1729 | return 0; | |
1730 | ||
d4d90b57 | 1731 | xfs_icsb_sync_counters(mp, 0); |
92821e2b DC |
1732 | |
1733 | /* | |
1734 | * we don't need to do this if we are updating the superblock | |
1735 | * counters on every modification. | |
1736 | */ | |
1737 | if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) | |
1738 | return 0; | |
1739 | ||
b2ce3974 | 1740 | tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT, KM_SLEEP); |
e457274b JL |
1741 | error = xfs_trans_reserve(tp, 0, XFS_SB_LOG_RES(mp), 0, 0, |
1742 | XFS_DEFAULT_LOG_COUNT); | |
92821e2b DC |
1743 | if (error) { |
1744 | xfs_trans_cancel(tp, 0); | |
1745 | return error; | |
1746 | } | |
1747 | ||
1748 | xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS); | |
adab0f67 | 1749 | xfs_trans_set_sync(tp); |
e5720eec DC |
1750 | error = xfs_trans_commit(tp, 0); |
1751 | return error; | |
92821e2b DC |
1752 | } |
1753 | ||
1da177e4 LT |
1754 | /* |
1755 | * xfs_mod_sb() can be used to copy arbitrary changes to the | |
1756 | * in-core superblock into the superblock buffer to be logged. | |
1757 | * It does not provide the higher level of locking that is | |
1758 | * needed to protect the in-core superblock from concurrent | |
1759 | * access. | |
1760 | */ | |
1761 | void | |
1762 | xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) | |
1763 | { | |
1764 | xfs_buf_t *bp; | |
1765 | int first; | |
1766 | int last; | |
1767 | xfs_mount_t *mp; | |
1da177e4 LT |
1768 | xfs_sb_field_t f; |
1769 | ||
1770 | ASSERT(fields); | |
1771 | if (!fields) | |
1772 | return; | |
1773 | mp = tp->t_mountp; | |
1774 | bp = xfs_trans_getsb(tp, mp, 0); | |
1da177e4 LT |
1775 | first = sizeof(xfs_sb_t); |
1776 | last = 0; | |
1777 | ||
1778 | /* translate/copy */ | |
1779 | ||
2bdf7cd0 | 1780 | xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields); |
1da177e4 LT |
1781 | |
1782 | /* find modified range */ | |
587aa0fe DC |
1783 | f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); |
1784 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1785 | last = xfs_sb_info[f + 1].offset - 1; | |
1da177e4 LT |
1786 | |
1787 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
1788 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1789 | first = xfs_sb_info[f].offset; | |
1790 | ||
04a1e6c5 | 1791 | xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF); |
1da177e4 LT |
1792 | xfs_trans_log_buf(tp, bp, first, last); |
1793 | } | |
d210a28c | 1794 | |
d210a28c | 1795 | |
1da177e4 LT |
1796 | /* |
1797 | * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply | |
1798 | * a delta to a specified field in the in-core superblock. Simply | |
1799 | * switch on the field indicated and apply the delta to that field. | |
1800 | * Fields are not allowed to dip below zero, so if the delta would | |
1801 | * do this do not apply it and return EINVAL. | |
1802 | * | |
3685c2a1 | 1803 | * The m_sb_lock must be held when this routine is called. |
1da177e4 | 1804 | */ |
d96f8f89 | 1805 | STATIC int |
20f4ebf2 DC |
1806 | xfs_mod_incore_sb_unlocked( |
1807 | xfs_mount_t *mp, | |
1808 | xfs_sb_field_t field, | |
1809 | int64_t delta, | |
1810 | int rsvd) | |
1da177e4 LT |
1811 | { |
1812 | int scounter; /* short counter for 32 bit fields */ | |
1813 | long long lcounter; /* long counter for 64 bit fields */ | |
1814 | long long res_used, rem; | |
1815 | ||
1816 | /* | |
1817 | * With the in-core superblock spin lock held, switch | |
1818 | * on the indicated field. Apply the delta to the | |
1819 | * proper field. If the fields value would dip below | |
1820 | * 0, then do not apply the delta and return EINVAL. | |
1821 | */ | |
1822 | switch (field) { | |
1823 | case XFS_SBS_ICOUNT: | |
1824 | lcounter = (long long)mp->m_sb.sb_icount; | |
1825 | lcounter += delta; | |
1826 | if (lcounter < 0) { | |
1827 | ASSERT(0); | |
014c2544 | 1828 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1829 | } |
1830 | mp->m_sb.sb_icount = lcounter; | |
014c2544 | 1831 | return 0; |
1da177e4 LT |
1832 | case XFS_SBS_IFREE: |
1833 | lcounter = (long long)mp->m_sb.sb_ifree; | |
1834 | lcounter += delta; | |
1835 | if (lcounter < 0) { | |
1836 | ASSERT(0); | |
014c2544 | 1837 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1838 | } |
1839 | mp->m_sb.sb_ifree = lcounter; | |
014c2544 | 1840 | return 0; |
1da177e4 | 1841 | case XFS_SBS_FDBLOCKS: |
4be536de DC |
1842 | lcounter = (long long) |
1843 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); | |
1da177e4 LT |
1844 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
1845 | ||
1846 | if (delta > 0) { /* Putting blocks back */ | |
1847 | if (res_used > delta) { | |
1848 | mp->m_resblks_avail += delta; | |
1849 | } else { | |
1850 | rem = delta - res_used; | |
1851 | mp->m_resblks_avail = mp->m_resblks; | |
1852 | lcounter += rem; | |
1853 | } | |
1854 | } else { /* Taking blocks away */ | |
1da177e4 | 1855 | lcounter += delta; |
8babd8a2 DC |
1856 | if (lcounter >= 0) { |
1857 | mp->m_sb.sb_fdblocks = lcounter + | |
1858 | XFS_ALLOC_SET_ASIDE(mp); | |
1859 | return 0; | |
1860 | } | |
1da177e4 | 1861 | |
8babd8a2 DC |
1862 | /* |
1863 | * We are out of blocks, use any available reserved | |
1864 | * blocks if were allowed to. | |
1865 | */ | |
1866 | if (!rsvd) | |
1867 | return XFS_ERROR(ENOSPC); | |
1da177e4 | 1868 | |
8babd8a2 DC |
1869 | lcounter = (long long)mp->m_resblks_avail + delta; |
1870 | if (lcounter >= 0) { | |
1871 | mp->m_resblks_avail = lcounter; | |
1872 | return 0; | |
1da177e4 | 1873 | } |
8babd8a2 DC |
1874 | printk_once(KERN_WARNING |
1875 | "Filesystem \"%s\": reserve blocks depleted! " | |
1876 | "Consider increasing reserve pool size.", | |
1877 | mp->m_fsname); | |
1878 | return XFS_ERROR(ENOSPC); | |
1da177e4 LT |
1879 | } |
1880 | ||
4be536de | 1881 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
014c2544 | 1882 | return 0; |
1da177e4 LT |
1883 | case XFS_SBS_FREXTENTS: |
1884 | lcounter = (long long)mp->m_sb.sb_frextents; | |
1885 | lcounter += delta; | |
1886 | if (lcounter < 0) { | |
014c2544 | 1887 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1888 | } |
1889 | mp->m_sb.sb_frextents = lcounter; | |
014c2544 | 1890 | return 0; |
1da177e4 LT |
1891 | case XFS_SBS_DBLOCKS: |
1892 | lcounter = (long long)mp->m_sb.sb_dblocks; | |
1893 | lcounter += delta; | |
1894 | if (lcounter < 0) { | |
1895 | ASSERT(0); | |
014c2544 | 1896 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1897 | } |
1898 | mp->m_sb.sb_dblocks = lcounter; | |
014c2544 | 1899 | return 0; |
1da177e4 LT |
1900 | case XFS_SBS_AGCOUNT: |
1901 | scounter = mp->m_sb.sb_agcount; | |
1902 | scounter += delta; | |
1903 | if (scounter < 0) { | |
1904 | ASSERT(0); | |
014c2544 | 1905 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1906 | } |
1907 | mp->m_sb.sb_agcount = scounter; | |
014c2544 | 1908 | return 0; |
1da177e4 LT |
1909 | case XFS_SBS_IMAX_PCT: |
1910 | scounter = mp->m_sb.sb_imax_pct; | |
1911 | scounter += delta; | |
1912 | if (scounter < 0) { | |
1913 | ASSERT(0); | |
014c2544 | 1914 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1915 | } |
1916 | mp->m_sb.sb_imax_pct = scounter; | |
014c2544 | 1917 | return 0; |
1da177e4 LT |
1918 | case XFS_SBS_REXTSIZE: |
1919 | scounter = mp->m_sb.sb_rextsize; | |
1920 | scounter += delta; | |
1921 | if (scounter < 0) { | |
1922 | ASSERT(0); | |
014c2544 | 1923 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1924 | } |
1925 | mp->m_sb.sb_rextsize = scounter; | |
014c2544 | 1926 | return 0; |
1da177e4 LT |
1927 | case XFS_SBS_RBMBLOCKS: |
1928 | scounter = mp->m_sb.sb_rbmblocks; | |
1929 | scounter += delta; | |
1930 | if (scounter < 0) { | |
1931 | ASSERT(0); | |
014c2544 | 1932 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1933 | } |
1934 | mp->m_sb.sb_rbmblocks = scounter; | |
014c2544 | 1935 | return 0; |
1da177e4 LT |
1936 | case XFS_SBS_RBLOCKS: |
1937 | lcounter = (long long)mp->m_sb.sb_rblocks; | |
1938 | lcounter += delta; | |
1939 | if (lcounter < 0) { | |
1940 | ASSERT(0); | |
014c2544 | 1941 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1942 | } |
1943 | mp->m_sb.sb_rblocks = lcounter; | |
014c2544 | 1944 | return 0; |
1da177e4 LT |
1945 | case XFS_SBS_REXTENTS: |
1946 | lcounter = (long long)mp->m_sb.sb_rextents; | |
1947 | lcounter += delta; | |
1948 | if (lcounter < 0) { | |
1949 | ASSERT(0); | |
014c2544 | 1950 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1951 | } |
1952 | mp->m_sb.sb_rextents = lcounter; | |
014c2544 | 1953 | return 0; |
1da177e4 LT |
1954 | case XFS_SBS_REXTSLOG: |
1955 | scounter = mp->m_sb.sb_rextslog; | |
1956 | scounter += delta; | |
1957 | if (scounter < 0) { | |
1958 | ASSERT(0); | |
014c2544 | 1959 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1960 | } |
1961 | mp->m_sb.sb_rextslog = scounter; | |
014c2544 | 1962 | return 0; |
1da177e4 LT |
1963 | default: |
1964 | ASSERT(0); | |
014c2544 | 1965 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1966 | } |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * xfs_mod_incore_sb() is used to change a field in the in-core | |
1971 | * superblock structure by the specified delta. This modification | |
3685c2a1 | 1972 | * is protected by the m_sb_lock. Just use the xfs_mod_incore_sb_unlocked() |
1da177e4 LT |
1973 | * routine to do the work. |
1974 | */ | |
1975 | int | |
20f4ebf2 | 1976 | xfs_mod_incore_sb( |
96540c78 CH |
1977 | struct xfs_mount *mp, |
1978 | xfs_sb_field_t field, | |
1979 | int64_t delta, | |
1980 | int rsvd) | |
1da177e4 | 1981 | { |
96540c78 | 1982 | int status; |
1da177e4 | 1983 | |
8d280b98 | 1984 | #ifdef HAVE_PERCPU_SB |
96540c78 | 1985 | ASSERT(field < XFS_SBS_ICOUNT || field > XFS_SBS_FDBLOCKS); |
8d280b98 | 1986 | #endif |
96540c78 CH |
1987 | spin_lock(&mp->m_sb_lock); |
1988 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); | |
1989 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 | 1990 | |
014c2544 | 1991 | return status; |
1da177e4 LT |
1992 | } |
1993 | ||
1994 | /* | |
1b040712 | 1995 | * Change more than one field in the in-core superblock structure at a time. |
1da177e4 | 1996 | * |
1b040712 CH |
1997 | * The fields and changes to those fields are specified in the array of |
1998 | * xfs_mod_sb structures passed in. Either all of the specified deltas | |
1999 | * will be applied or none of them will. If any modified field dips below 0, | |
2000 | * then all modifications will be backed out and EINVAL will be returned. | |
2001 | * | |
2002 | * Note that this function may not be used for the superblock values that | |
2003 | * are tracked with the in-memory per-cpu counters - a direct call to | |
2004 | * xfs_icsb_modify_counters is required for these. | |
1da177e4 LT |
2005 | */ |
2006 | int | |
1b040712 CH |
2007 | xfs_mod_incore_sb_batch( |
2008 | struct xfs_mount *mp, | |
2009 | xfs_mod_sb_t *msb, | |
2010 | uint nmsb, | |
2011 | int rsvd) | |
1da177e4 | 2012 | { |
45c51b99 | 2013 | xfs_mod_sb_t *msbp; |
1b040712 | 2014 | int error = 0; |
1da177e4 LT |
2015 | |
2016 | /* | |
1b040712 CH |
2017 | * Loop through the array of mod structures and apply each individually. |
2018 | * If any fail, then back out all those which have already been applied. | |
2019 | * Do all of this within the scope of the m_sb_lock so that all of the | |
2020 | * changes will be atomic. | |
1da177e4 | 2021 | */ |
3685c2a1 | 2022 | spin_lock(&mp->m_sb_lock); |
45c51b99 | 2023 | for (msbp = msb; msbp < (msb + nmsb); msbp++) { |
1b040712 CH |
2024 | ASSERT(msbp->msb_field < XFS_SBS_ICOUNT || |
2025 | msbp->msb_field > XFS_SBS_FDBLOCKS); | |
8d280b98 | 2026 | |
1b040712 CH |
2027 | error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, |
2028 | msbp->msb_delta, rsvd); | |
2029 | if (error) | |
2030 | goto unwind; | |
1da177e4 | 2031 | } |
1b040712 CH |
2032 | spin_unlock(&mp->m_sb_lock); |
2033 | return 0; | |
1da177e4 | 2034 | |
1b040712 CH |
2035 | unwind: |
2036 | while (--msbp >= msb) { | |
2037 | error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, | |
2038 | -msbp->msb_delta, rsvd); | |
2039 | ASSERT(error == 0); | |
1da177e4 | 2040 | } |
3685c2a1 | 2041 | spin_unlock(&mp->m_sb_lock); |
1b040712 | 2042 | return error; |
1da177e4 LT |
2043 | } |
2044 | ||
2045 | /* | |
2046 | * xfs_getsb() is called to obtain the buffer for the superblock. | |
2047 | * The buffer is returned locked and read in from disk. | |
2048 | * The buffer should be released with a call to xfs_brelse(). | |
2049 | * | |
2050 | * If the flags parameter is BUF_TRYLOCK, then we'll only return | |
2051 | * the superblock buffer if it can be locked without sleeping. | |
2052 | * If it can't then we'll return NULL. | |
2053 | */ | |
0c842ad4 | 2054 | struct xfs_buf * |
1da177e4 | 2055 | xfs_getsb( |
0c842ad4 CH |
2056 | struct xfs_mount *mp, |
2057 | int flags) | |
1da177e4 | 2058 | { |
0c842ad4 | 2059 | struct xfs_buf *bp = mp->m_sb_bp; |
1da177e4 | 2060 | |
0c842ad4 CH |
2061 | if (!xfs_buf_trylock(bp)) { |
2062 | if (flags & XBF_TRYLOCK) | |
1da177e4 | 2063 | return NULL; |
0c842ad4 | 2064 | xfs_buf_lock(bp); |
1da177e4 | 2065 | } |
0c842ad4 | 2066 | |
72790aa1 | 2067 | xfs_buf_hold(bp); |
1da177e4 | 2068 | ASSERT(XFS_BUF_ISDONE(bp)); |
014c2544 | 2069 | return bp; |
1da177e4 LT |
2070 | } |
2071 | ||
2072 | /* | |
2073 | * Used to free the superblock along various error paths. | |
2074 | */ | |
2075 | void | |
2076 | xfs_freesb( | |
26af6552 | 2077 | struct xfs_mount *mp) |
1da177e4 | 2078 | { |
26af6552 | 2079 | struct xfs_buf *bp = mp->m_sb_bp; |
1da177e4 | 2080 | |
26af6552 | 2081 | xfs_buf_lock(bp); |
1da177e4 | 2082 | mp->m_sb_bp = NULL; |
26af6552 | 2083 | xfs_buf_relse(bp); |
1da177e4 LT |
2084 | } |
2085 | ||
1da177e4 LT |
2086 | /* |
2087 | * Used to log changes to the superblock unit and width fields which could | |
e6957ea4 ES |
2088 | * be altered by the mount options, as well as any potential sb_features2 |
2089 | * fixup. Only the first superblock is updated. | |
1da177e4 | 2090 | */ |
7884bc86 | 2091 | int |
ee1c0908 | 2092 | xfs_mount_log_sb( |
1da177e4 LT |
2093 | xfs_mount_t *mp, |
2094 | __int64_t fields) | |
2095 | { | |
2096 | xfs_trans_t *tp; | |
e5720eec | 2097 | int error; |
1da177e4 | 2098 | |
ee1c0908 | 2099 | ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID | |
4b166de0 DC |
2100 | XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2 | |
2101 | XFS_SB_VERSIONNUM)); | |
1da177e4 LT |
2102 | |
2103 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); | |
5166ab06 JL |
2104 | error = xfs_trans_reserve(tp, 0, XFS_SB_LOG_RES(mp), 0, 0, |
2105 | XFS_DEFAULT_LOG_COUNT); | |
e5720eec | 2106 | if (error) { |
1da177e4 | 2107 | xfs_trans_cancel(tp, 0); |
e5720eec | 2108 | return error; |
1da177e4 LT |
2109 | } |
2110 | xfs_mod_sb(tp, fields); | |
e5720eec DC |
2111 | error = xfs_trans_commit(tp, 0); |
2112 | return error; | |
1da177e4 | 2113 | } |
8d280b98 | 2114 | |
dda35b8f CH |
2115 | /* |
2116 | * If the underlying (data/log/rt) device is readonly, there are some | |
2117 | * operations that cannot proceed. | |
2118 | */ | |
2119 | int | |
2120 | xfs_dev_is_read_only( | |
2121 | struct xfs_mount *mp, | |
2122 | char *message) | |
2123 | { | |
2124 | if (xfs_readonly_buftarg(mp->m_ddev_targp) || | |
2125 | xfs_readonly_buftarg(mp->m_logdev_targp) || | |
2126 | (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { | |
0b932ccc DC |
2127 | xfs_notice(mp, "%s required on read-only device.", message); |
2128 | xfs_notice(mp, "write access unavailable, cannot proceed."); | |
dda35b8f CH |
2129 | return EROFS; |
2130 | } | |
2131 | return 0; | |
2132 | } | |
8d280b98 DC |
2133 | |
2134 | #ifdef HAVE_PERCPU_SB | |
2135 | /* | |
2136 | * Per-cpu incore superblock counters | |
2137 | * | |
2138 | * Simple concept, difficult implementation | |
2139 | * | |
2140 | * Basically, replace the incore superblock counters with a distributed per cpu | |
2141 | * counter for contended fields (e.g. free block count). | |
2142 | * | |
2143 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and | |
2144 | * hence needs to be accurately read when we are running low on space. Hence | |
2145 | * there is a method to enable and disable the per-cpu counters based on how | |
2146 | * much "stuff" is available in them. | |
2147 | * | |
2148 | * Basically, a counter is enabled if there is enough free resource to justify | |
2149 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local | |
2150 | * ENOSPC), then we disable the counters to synchronise all callers and | |
2151 | * re-distribute the available resources. | |
2152 | * | |
2153 | * If, once we redistributed the available resources, we still get a failure, | |
2154 | * we disable the per-cpu counter and go through the slow path. | |
2155 | * | |
2156 | * The slow path is the current xfs_mod_incore_sb() function. This means that | |
9da096fd | 2157 | * when we disable a per-cpu counter, we need to drain its resources back to |
8d280b98 DC |
2158 | * the global superblock. We do this after disabling the counter to prevent |
2159 | * more threads from queueing up on the counter. | |
2160 | * | |
2161 | * Essentially, this means that we still need a lock in the fast path to enable | |
2162 | * synchronisation between the global counters and the per-cpu counters. This | |
2163 | * is not a problem because the lock will be local to a CPU almost all the time | |
2164 | * and have little contention except when we get to ENOSPC conditions. | |
2165 | * | |
2166 | * Basically, this lock becomes a barrier that enables us to lock out the fast | |
2167 | * path while we do things like enabling and disabling counters and | |
2168 | * synchronising the counters. | |
2169 | * | |
2170 | * Locking rules: | |
2171 | * | |
3685c2a1 | 2172 | * 1. m_sb_lock before picking up per-cpu locks |
8d280b98 | 2173 | * 2. per-cpu locks always picked up via for_each_online_cpu() order |
3685c2a1 | 2174 | * 3. accurate counter sync requires m_sb_lock + per cpu locks |
8d280b98 | 2175 | * 4. modifying per-cpu counters requires holding per-cpu lock |
3685c2a1 ES |
2176 | * 5. modifying global counters requires holding m_sb_lock |
2177 | * 6. enabling or disabling a counter requires holding the m_sb_lock | |
8d280b98 DC |
2178 | * and _none_ of the per-cpu locks. |
2179 | * | |
2180 | * Disabled counters are only ever re-enabled by a balance operation | |
2181 | * that results in more free resources per CPU than a given threshold. | |
2182 | * To ensure counters don't remain disabled, they are rebalanced when | |
2183 | * the global resource goes above a higher threshold (i.e. some hysteresis | |
2184 | * is present to prevent thrashing). | |
e8234a68 DC |
2185 | */ |
2186 | ||
5a67e4c5 | 2187 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
2188 | /* |
2189 | * hot-plug CPU notifier support. | |
8d280b98 | 2190 | * |
5a67e4c5 CS |
2191 | * We need a notifier per filesystem as we need to be able to identify |
2192 | * the filesystem to balance the counters out. This is achieved by | |
2193 | * having a notifier block embedded in the xfs_mount_t and doing pointer | |
2194 | * magic to get the mount pointer from the notifier block address. | |
8d280b98 | 2195 | */ |
e8234a68 DC |
2196 | STATIC int |
2197 | xfs_icsb_cpu_notify( | |
2198 | struct notifier_block *nfb, | |
2199 | unsigned long action, | |
2200 | void *hcpu) | |
2201 | { | |
2202 | xfs_icsb_cnts_t *cntp; | |
2203 | xfs_mount_t *mp; | |
e8234a68 DC |
2204 | |
2205 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); | |
2206 | cntp = (xfs_icsb_cnts_t *) | |
2207 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); | |
2208 | switch (action) { | |
2209 | case CPU_UP_PREPARE: | |
8bb78442 | 2210 | case CPU_UP_PREPARE_FROZEN: |
e8234a68 DC |
2211 | /* Easy Case - initialize the area and locks, and |
2212 | * then rebalance when online does everything else for us. */ | |
01e1b69c | 2213 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 DC |
2214 | break; |
2215 | case CPU_ONLINE: | |
8bb78442 | 2216 | case CPU_ONLINE_FROZEN: |
03135cf7 | 2217 | xfs_icsb_lock(mp); |
45af6c6d CH |
2218 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
2219 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); | |
2220 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); | |
03135cf7 | 2221 | xfs_icsb_unlock(mp); |
e8234a68 DC |
2222 | break; |
2223 | case CPU_DEAD: | |
8bb78442 | 2224 | case CPU_DEAD_FROZEN: |
e8234a68 DC |
2225 | /* Disable all the counters, then fold the dead cpu's |
2226 | * count into the total on the global superblock and | |
2227 | * re-enable the counters. */ | |
03135cf7 | 2228 | xfs_icsb_lock(mp); |
3685c2a1 | 2229 | spin_lock(&mp->m_sb_lock); |
e8234a68 DC |
2230 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); |
2231 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); | |
2232 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); | |
2233 | ||
2234 | mp->m_sb.sb_icount += cntp->icsb_icount; | |
2235 | mp->m_sb.sb_ifree += cntp->icsb_ifree; | |
2236 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; | |
2237 | ||
01e1b69c | 2238 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 | 2239 | |
45af6c6d CH |
2240 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_ICOUNT, 0); |
2241 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_IFREE, 0); | |
2242 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_FDBLOCKS, 0); | |
3685c2a1 | 2243 | spin_unlock(&mp->m_sb_lock); |
03135cf7 | 2244 | xfs_icsb_unlock(mp); |
e8234a68 DC |
2245 | break; |
2246 | } | |
2247 | ||
2248 | return NOTIFY_OK; | |
2249 | } | |
5a67e4c5 | 2250 | #endif /* CONFIG_HOTPLUG_CPU */ |
e8234a68 | 2251 | |
8d280b98 DC |
2252 | int |
2253 | xfs_icsb_init_counters( | |
2254 | xfs_mount_t *mp) | |
2255 | { | |
2256 | xfs_icsb_cnts_t *cntp; | |
2257 | int i; | |
2258 | ||
2259 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); | |
2260 | if (mp->m_sb_cnts == NULL) | |
2261 | return -ENOMEM; | |
2262 | ||
5a67e4c5 | 2263 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
2264 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; |
2265 | mp->m_icsb_notifier.priority = 0; | |
5a67e4c5 CS |
2266 | register_hotcpu_notifier(&mp->m_icsb_notifier); |
2267 | #endif /* CONFIG_HOTPLUG_CPU */ | |
e8234a68 | 2268 | |
8d280b98 DC |
2269 | for_each_online_cpu(i) { |
2270 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2271 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
8d280b98 | 2272 | } |
20b64285 DC |
2273 | |
2274 | mutex_init(&mp->m_icsb_mutex); | |
2275 | ||
8d280b98 DC |
2276 | /* |
2277 | * start with all counters disabled so that the | |
2278 | * initial balance kicks us off correctly | |
2279 | */ | |
2280 | mp->m_icsb_counters = -1; | |
2281 | return 0; | |
2282 | } | |
2283 | ||
5478eead LM |
2284 | void |
2285 | xfs_icsb_reinit_counters( | |
2286 | xfs_mount_t *mp) | |
2287 | { | |
2288 | xfs_icsb_lock(mp); | |
2289 | /* | |
2290 | * start with all counters disabled so that the | |
2291 | * initial balance kicks us off correctly | |
2292 | */ | |
2293 | mp->m_icsb_counters = -1; | |
45af6c6d CH |
2294 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
2295 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); | |
2296 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); | |
5478eead LM |
2297 | xfs_icsb_unlock(mp); |
2298 | } | |
2299 | ||
c962fb79 | 2300 | void |
8d280b98 DC |
2301 | xfs_icsb_destroy_counters( |
2302 | xfs_mount_t *mp) | |
2303 | { | |
e8234a68 | 2304 | if (mp->m_sb_cnts) { |
5a67e4c5 | 2305 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
8d280b98 | 2306 | free_percpu(mp->m_sb_cnts); |
e8234a68 | 2307 | } |
03135cf7 | 2308 | mutex_destroy(&mp->m_icsb_mutex); |
8d280b98 DC |
2309 | } |
2310 | ||
b8f82a4a | 2311 | STATIC void |
01e1b69c DC |
2312 | xfs_icsb_lock_cntr( |
2313 | xfs_icsb_cnts_t *icsbp) | |
2314 | { | |
2315 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { | |
2316 | ndelay(1000); | |
2317 | } | |
2318 | } | |
2319 | ||
b8f82a4a | 2320 | STATIC void |
01e1b69c DC |
2321 | xfs_icsb_unlock_cntr( |
2322 | xfs_icsb_cnts_t *icsbp) | |
2323 | { | |
2324 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); | |
2325 | } | |
2326 | ||
8d280b98 | 2327 | |
b8f82a4a | 2328 | STATIC void |
8d280b98 DC |
2329 | xfs_icsb_lock_all_counters( |
2330 | xfs_mount_t *mp) | |
2331 | { | |
2332 | xfs_icsb_cnts_t *cntp; | |
2333 | int i; | |
2334 | ||
2335 | for_each_online_cpu(i) { | |
2336 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2337 | xfs_icsb_lock_cntr(cntp); |
8d280b98 DC |
2338 | } |
2339 | } | |
2340 | ||
b8f82a4a | 2341 | STATIC void |
8d280b98 DC |
2342 | xfs_icsb_unlock_all_counters( |
2343 | xfs_mount_t *mp) | |
2344 | { | |
2345 | xfs_icsb_cnts_t *cntp; | |
2346 | int i; | |
2347 | ||
2348 | for_each_online_cpu(i) { | |
2349 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2350 | xfs_icsb_unlock_cntr(cntp); |
8d280b98 DC |
2351 | } |
2352 | } | |
2353 | ||
2354 | STATIC void | |
2355 | xfs_icsb_count( | |
2356 | xfs_mount_t *mp, | |
2357 | xfs_icsb_cnts_t *cnt, | |
2358 | int flags) | |
2359 | { | |
2360 | xfs_icsb_cnts_t *cntp; | |
2361 | int i; | |
2362 | ||
2363 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); | |
2364 | ||
2365 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2366 | xfs_icsb_lock_all_counters(mp); | |
2367 | ||
2368 | for_each_online_cpu(i) { | |
2369 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
2370 | cnt->icsb_icount += cntp->icsb_icount; | |
2371 | cnt->icsb_ifree += cntp->icsb_ifree; | |
2372 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; | |
2373 | } | |
2374 | ||
2375 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2376 | xfs_icsb_unlock_all_counters(mp); | |
2377 | } | |
2378 | ||
2379 | STATIC int | |
2380 | xfs_icsb_counter_disabled( | |
2381 | xfs_mount_t *mp, | |
2382 | xfs_sb_field_t field) | |
2383 | { | |
2384 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2385 | return test_bit(field, &mp->m_icsb_counters); | |
2386 | } | |
2387 | ||
36fbe6e6 | 2388 | STATIC void |
8d280b98 DC |
2389 | xfs_icsb_disable_counter( |
2390 | xfs_mount_t *mp, | |
2391 | xfs_sb_field_t field) | |
2392 | { | |
2393 | xfs_icsb_cnts_t cnt; | |
2394 | ||
2395 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2396 | ||
20b64285 DC |
2397 | /* |
2398 | * If we are already disabled, then there is nothing to do | |
2399 | * here. We check before locking all the counters to avoid | |
2400 | * the expensive lock operation when being called in the | |
2401 | * slow path and the counter is already disabled. This is | |
2402 | * safe because the only time we set or clear this state is under | |
2403 | * the m_icsb_mutex. | |
2404 | */ | |
2405 | if (xfs_icsb_counter_disabled(mp, field)) | |
36fbe6e6 | 2406 | return; |
20b64285 | 2407 | |
8d280b98 DC |
2408 | xfs_icsb_lock_all_counters(mp); |
2409 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { | |
2410 | /* drain back to superblock */ | |
2411 | ||
ce46193b | 2412 | xfs_icsb_count(mp, &cnt, XFS_ICSB_LAZY_COUNT); |
8d280b98 DC |
2413 | switch(field) { |
2414 | case XFS_SBS_ICOUNT: | |
2415 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2416 | break; | |
2417 | case XFS_SBS_IFREE: | |
2418 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2419 | break; | |
2420 | case XFS_SBS_FDBLOCKS: | |
2421 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2422 | break; | |
2423 | default: | |
2424 | BUG(); | |
2425 | } | |
2426 | } | |
2427 | ||
2428 | xfs_icsb_unlock_all_counters(mp); | |
8d280b98 DC |
2429 | } |
2430 | ||
2431 | STATIC void | |
2432 | xfs_icsb_enable_counter( | |
2433 | xfs_mount_t *mp, | |
2434 | xfs_sb_field_t field, | |
2435 | uint64_t count, | |
2436 | uint64_t resid) | |
2437 | { | |
2438 | xfs_icsb_cnts_t *cntp; | |
2439 | int i; | |
2440 | ||
2441 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2442 | ||
2443 | xfs_icsb_lock_all_counters(mp); | |
2444 | for_each_online_cpu(i) { | |
2445 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); | |
2446 | switch (field) { | |
2447 | case XFS_SBS_ICOUNT: | |
2448 | cntp->icsb_icount = count + resid; | |
2449 | break; | |
2450 | case XFS_SBS_IFREE: | |
2451 | cntp->icsb_ifree = count + resid; | |
2452 | break; | |
2453 | case XFS_SBS_FDBLOCKS: | |
2454 | cntp->icsb_fdblocks = count + resid; | |
2455 | break; | |
2456 | default: | |
2457 | BUG(); | |
2458 | break; | |
2459 | } | |
2460 | resid = 0; | |
2461 | } | |
2462 | clear_bit(field, &mp->m_icsb_counters); | |
2463 | xfs_icsb_unlock_all_counters(mp); | |
2464 | } | |
2465 | ||
dbcabad1 | 2466 | void |
d4d90b57 | 2467 | xfs_icsb_sync_counters_locked( |
8d280b98 DC |
2468 | xfs_mount_t *mp, |
2469 | int flags) | |
2470 | { | |
2471 | xfs_icsb_cnts_t cnt; | |
8d280b98 | 2472 | |
8d280b98 DC |
2473 | xfs_icsb_count(mp, &cnt, flags); |
2474 | ||
8d280b98 DC |
2475 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) |
2476 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2477 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) | |
2478 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2479 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) | |
2480 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
8d280b98 DC |
2481 | } |
2482 | ||
2483 | /* | |
2484 | * Accurate update of per-cpu counters to incore superblock | |
2485 | */ | |
d4d90b57 | 2486 | void |
8d280b98 | 2487 | xfs_icsb_sync_counters( |
d4d90b57 CH |
2488 | xfs_mount_t *mp, |
2489 | int flags) | |
8d280b98 | 2490 | { |
d4d90b57 CH |
2491 | spin_lock(&mp->m_sb_lock); |
2492 | xfs_icsb_sync_counters_locked(mp, flags); | |
2493 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 DC |
2494 | } |
2495 | ||
2496 | /* | |
2497 | * Balance and enable/disable counters as necessary. | |
2498 | * | |
20b64285 DC |
2499 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
2500 | * chosen to be the same number as single on disk allocation chunk per CPU, and | |
2501 | * free blocks is something far enough zero that we aren't going thrash when we | |
2502 | * get near ENOSPC. We also need to supply a minimum we require per cpu to | |
2503 | * prevent looping endlessly when xfs_alloc_space asks for more than will | |
2504 | * be distributed to a single CPU but each CPU has enough blocks to be | |
2505 | * reenabled. | |
2506 | * | |
2507 | * Note that we can be called when counters are already disabled. | |
2508 | * xfs_icsb_disable_counter() optimises the counter locking in this case to | |
2509 | * prevent locking every per-cpu counter needlessly. | |
8d280b98 | 2510 | */ |
20b64285 DC |
2511 | |
2512 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 | |
4be536de | 2513 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
20b64285 | 2514 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
8d280b98 | 2515 | STATIC void |
45af6c6d | 2516 | xfs_icsb_balance_counter_locked( |
8d280b98 DC |
2517 | xfs_mount_t *mp, |
2518 | xfs_sb_field_t field, | |
20b64285 | 2519 | int min_per_cpu) |
8d280b98 | 2520 | { |
6fdf8ccc | 2521 | uint64_t count, resid; |
8d280b98 | 2522 | int weight = num_online_cpus(); |
20b64285 | 2523 | uint64_t min = (uint64_t)min_per_cpu; |
8d280b98 | 2524 | |
8d280b98 DC |
2525 | /* disable counter and sync counter */ |
2526 | xfs_icsb_disable_counter(mp, field); | |
2527 | ||
2528 | /* update counters - first CPU gets residual*/ | |
2529 | switch (field) { | |
2530 | case XFS_SBS_ICOUNT: | |
2531 | count = mp->m_sb.sb_icount; | |
2532 | resid = do_div(count, weight); | |
20b64285 | 2533 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
45af6c6d | 2534 | return; |
8d280b98 DC |
2535 | break; |
2536 | case XFS_SBS_IFREE: | |
2537 | count = mp->m_sb.sb_ifree; | |
2538 | resid = do_div(count, weight); | |
20b64285 | 2539 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
45af6c6d | 2540 | return; |
8d280b98 DC |
2541 | break; |
2542 | case XFS_SBS_FDBLOCKS: | |
2543 | count = mp->m_sb.sb_fdblocks; | |
2544 | resid = do_div(count, weight); | |
20b64285 | 2545 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
45af6c6d | 2546 | return; |
8d280b98 DC |
2547 | break; |
2548 | default: | |
2549 | BUG(); | |
6fdf8ccc | 2550 | count = resid = 0; /* quiet, gcc */ |
8d280b98 DC |
2551 | break; |
2552 | } | |
2553 | ||
2554 | xfs_icsb_enable_counter(mp, field, count, resid); | |
45af6c6d CH |
2555 | } |
2556 | ||
2557 | STATIC void | |
2558 | xfs_icsb_balance_counter( | |
2559 | xfs_mount_t *mp, | |
2560 | xfs_sb_field_t fields, | |
2561 | int min_per_cpu) | |
2562 | { | |
2563 | spin_lock(&mp->m_sb_lock); | |
2564 | xfs_icsb_balance_counter_locked(mp, fields, min_per_cpu); | |
2565 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 DC |
2566 | } |
2567 | ||
1b040712 | 2568 | int |
20b64285 | 2569 | xfs_icsb_modify_counters( |
8d280b98 DC |
2570 | xfs_mount_t *mp, |
2571 | xfs_sb_field_t field, | |
20f4ebf2 | 2572 | int64_t delta, |
20b64285 | 2573 | int rsvd) |
8d280b98 DC |
2574 | { |
2575 | xfs_icsb_cnts_t *icsbp; | |
2576 | long long lcounter; /* long counter for 64 bit fields */ | |
7a9e02d6 | 2577 | int ret = 0; |
8d280b98 | 2578 | |
20b64285 | 2579 | might_sleep(); |
8d280b98 | 2580 | again: |
7a9e02d6 CL |
2581 | preempt_disable(); |
2582 | icsbp = this_cpu_ptr(mp->m_sb_cnts); | |
20b64285 DC |
2583 | |
2584 | /* | |
2585 | * if the counter is disabled, go to slow path | |
2586 | */ | |
8d280b98 DC |
2587 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
2588 | goto slow_path; | |
20b64285 DC |
2589 | xfs_icsb_lock_cntr(icsbp); |
2590 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { | |
2591 | xfs_icsb_unlock_cntr(icsbp); | |
2592 | goto slow_path; | |
2593 | } | |
8d280b98 DC |
2594 | |
2595 | switch (field) { | |
2596 | case XFS_SBS_ICOUNT: | |
2597 | lcounter = icsbp->icsb_icount; | |
2598 | lcounter += delta; | |
2599 | if (unlikely(lcounter < 0)) | |
20b64285 | 2600 | goto balance_counter; |
8d280b98 DC |
2601 | icsbp->icsb_icount = lcounter; |
2602 | break; | |
2603 | ||
2604 | case XFS_SBS_IFREE: | |
2605 | lcounter = icsbp->icsb_ifree; | |
2606 | lcounter += delta; | |
2607 | if (unlikely(lcounter < 0)) | |
20b64285 | 2608 | goto balance_counter; |
8d280b98 DC |
2609 | icsbp->icsb_ifree = lcounter; |
2610 | break; | |
2611 | ||
2612 | case XFS_SBS_FDBLOCKS: | |
2613 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); | |
2614 | ||
4be536de | 2615 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2616 | lcounter += delta; |
2617 | if (unlikely(lcounter < 0)) | |
20b64285 | 2618 | goto balance_counter; |
4be536de | 2619 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2620 | break; |
2621 | default: | |
2622 | BUG(); | |
2623 | break; | |
2624 | } | |
01e1b69c | 2625 | xfs_icsb_unlock_cntr(icsbp); |
7a9e02d6 | 2626 | preempt_enable(); |
8d280b98 DC |
2627 | return 0; |
2628 | ||
8d280b98 | 2629 | slow_path: |
7a9e02d6 | 2630 | preempt_enable(); |
8d280b98 | 2631 | |
20b64285 DC |
2632 | /* |
2633 | * serialise with a mutex so we don't burn lots of cpu on | |
2634 | * the superblock lock. We still need to hold the superblock | |
2635 | * lock, however, when we modify the global structures. | |
2636 | */ | |
03135cf7 | 2637 | xfs_icsb_lock(mp); |
20b64285 DC |
2638 | |
2639 | /* | |
2640 | * Now running atomically. | |
2641 | * | |
2642 | * If the counter is enabled, someone has beaten us to rebalancing. | |
2643 | * Drop the lock and try again in the fast path.... | |
2644 | */ | |
2645 | if (!(xfs_icsb_counter_disabled(mp, field))) { | |
03135cf7 | 2646 | xfs_icsb_unlock(mp); |
8d280b98 | 2647 | goto again; |
8d280b98 DC |
2648 | } |
2649 | ||
20b64285 DC |
2650 | /* |
2651 | * The counter is currently disabled. Because we are | |
2652 | * running atomically here, we know a rebalance cannot | |
2653 | * be in progress. Hence we can go straight to operating | |
2654 | * on the global superblock. We do not call xfs_mod_incore_sb() | |
3685c2a1 | 2655 | * here even though we need to get the m_sb_lock. Doing so |
20b64285 | 2656 | * will cause us to re-enter this function and deadlock. |
3685c2a1 | 2657 | * Hence we get the m_sb_lock ourselves and then call |
20b64285 DC |
2658 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates |
2659 | * directly on the global counters. | |
2660 | */ | |
3685c2a1 | 2661 | spin_lock(&mp->m_sb_lock); |
8d280b98 | 2662 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
3685c2a1 | 2663 | spin_unlock(&mp->m_sb_lock); |
8d280b98 | 2664 | |
20b64285 DC |
2665 | /* |
2666 | * Now that we've modified the global superblock, we | |
2667 | * may be able to re-enable the distributed counters | |
2668 | * (e.g. lots of space just got freed). After that | |
2669 | * we are done. | |
2670 | */ | |
2671 | if (ret != ENOSPC) | |
45af6c6d | 2672 | xfs_icsb_balance_counter(mp, field, 0); |
03135cf7 | 2673 | xfs_icsb_unlock(mp); |
8d280b98 | 2674 | return ret; |
8d280b98 | 2675 | |
20b64285 DC |
2676 | balance_counter: |
2677 | xfs_icsb_unlock_cntr(icsbp); | |
7a9e02d6 | 2678 | preempt_enable(); |
8d280b98 | 2679 | |
20b64285 DC |
2680 | /* |
2681 | * We may have multiple threads here if multiple per-cpu | |
2682 | * counters run dry at the same time. This will mean we can | |
2683 | * do more balances than strictly necessary but it is not | |
2684 | * the common slowpath case. | |
2685 | */ | |
03135cf7 | 2686 | xfs_icsb_lock(mp); |
20b64285 DC |
2687 | |
2688 | /* | |
2689 | * running atomically. | |
2690 | * | |
2691 | * This will leave the counter in the correct state for future | |
2692 | * accesses. After the rebalance, we simply try again and our retry | |
2693 | * will either succeed through the fast path or slow path without | |
2694 | * another balance operation being required. | |
2695 | */ | |
45af6c6d | 2696 | xfs_icsb_balance_counter(mp, field, delta); |
03135cf7 | 2697 | xfs_icsb_unlock(mp); |
20b64285 | 2698 | goto again; |
8d280b98 | 2699 | } |
20b64285 | 2700 | |
8d280b98 | 2701 | #endif |