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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_dir2.h" |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
1da177e4 | 30 | #include "xfs_bmap_btree.h" |
a844f451 | 31 | #include "xfs_alloc_btree.h" |
1da177e4 | 32 | #include "xfs_ialloc_btree.h" |
1da177e4 | 33 | #include "xfs_dir2_sf.h" |
a844f451 | 34 | #include "xfs_attr_sf.h" |
1da177e4 LT |
35 | #include "xfs_dinode.h" |
36 | #include "xfs_inode.h" | |
a844f451 NS |
37 | #include "xfs_btree.h" |
38 | #include "xfs_ialloc.h" | |
1da177e4 LT |
39 | #include "xfs_alloc.h" |
40 | #include "xfs_rtalloc.h" | |
41 | #include "xfs_bmap.h" | |
42 | #include "xfs_error.h" | |
1da177e4 LT |
43 | #include "xfs_rw.h" |
44 | #include "xfs_quota.h" | |
45 | #include "xfs_fsops.h" | |
43355099 | 46 | #include "xfs_utils.h" |
1da177e4 | 47 | |
ba0f32d4 | 48 | STATIC void xfs_unmountfs_wait(xfs_mount_t *); |
1da177e4 | 49 | |
8d280b98 DC |
50 | |
51 | #ifdef HAVE_PERCPU_SB | |
20f4ebf2 | 52 | STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, |
45af6c6d CH |
53 | int); |
54 | STATIC void xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t, | |
55 | int); | |
8d280b98 | 56 | STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t, |
20f4ebf2 | 57 | int64_t, int); |
36fbe6e6 | 58 | STATIC void xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t); |
8d280b98 DC |
59 | |
60 | #else | |
61 | ||
45af6c6d CH |
62 | #define xfs_icsb_balance_counter(mp, a, b) do { } while (0) |
63 | #define xfs_icsb_balance_counter_locked(mp, a, b) do { } while (0) | |
8d280b98 | 64 | #define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0) |
8d280b98 DC |
65 | |
66 | #endif | |
67 | ||
1df84c93 | 68 | static const struct { |
8d280b98 DC |
69 | short offset; |
70 | short type; /* 0 = integer | |
71 | * 1 = binary / string (no translation) | |
72 | */ | |
1da177e4 LT |
73 | } xfs_sb_info[] = { |
74 | { offsetof(xfs_sb_t, sb_magicnum), 0 }, | |
75 | { offsetof(xfs_sb_t, sb_blocksize), 0 }, | |
76 | { offsetof(xfs_sb_t, sb_dblocks), 0 }, | |
77 | { offsetof(xfs_sb_t, sb_rblocks), 0 }, | |
78 | { offsetof(xfs_sb_t, sb_rextents), 0 }, | |
79 | { offsetof(xfs_sb_t, sb_uuid), 1 }, | |
80 | { offsetof(xfs_sb_t, sb_logstart), 0 }, | |
81 | { offsetof(xfs_sb_t, sb_rootino), 0 }, | |
82 | { offsetof(xfs_sb_t, sb_rbmino), 0 }, | |
83 | { offsetof(xfs_sb_t, sb_rsumino), 0 }, | |
84 | { offsetof(xfs_sb_t, sb_rextsize), 0 }, | |
85 | { offsetof(xfs_sb_t, sb_agblocks), 0 }, | |
86 | { offsetof(xfs_sb_t, sb_agcount), 0 }, | |
87 | { offsetof(xfs_sb_t, sb_rbmblocks), 0 }, | |
88 | { offsetof(xfs_sb_t, sb_logblocks), 0 }, | |
89 | { offsetof(xfs_sb_t, sb_versionnum), 0 }, | |
90 | { offsetof(xfs_sb_t, sb_sectsize), 0 }, | |
91 | { offsetof(xfs_sb_t, sb_inodesize), 0 }, | |
92 | { offsetof(xfs_sb_t, sb_inopblock), 0 }, | |
93 | { offsetof(xfs_sb_t, sb_fname[0]), 1 }, | |
94 | { offsetof(xfs_sb_t, sb_blocklog), 0 }, | |
95 | { offsetof(xfs_sb_t, sb_sectlog), 0 }, | |
96 | { offsetof(xfs_sb_t, sb_inodelog), 0 }, | |
97 | { offsetof(xfs_sb_t, sb_inopblog), 0 }, | |
98 | { offsetof(xfs_sb_t, sb_agblklog), 0 }, | |
99 | { offsetof(xfs_sb_t, sb_rextslog), 0 }, | |
100 | { offsetof(xfs_sb_t, sb_inprogress), 0 }, | |
101 | { offsetof(xfs_sb_t, sb_imax_pct), 0 }, | |
102 | { offsetof(xfs_sb_t, sb_icount), 0 }, | |
103 | { offsetof(xfs_sb_t, sb_ifree), 0 }, | |
104 | { offsetof(xfs_sb_t, sb_fdblocks), 0 }, | |
105 | { offsetof(xfs_sb_t, sb_frextents), 0 }, | |
106 | { offsetof(xfs_sb_t, sb_uquotino), 0 }, | |
107 | { offsetof(xfs_sb_t, sb_gquotino), 0 }, | |
108 | { offsetof(xfs_sb_t, sb_qflags), 0 }, | |
109 | { offsetof(xfs_sb_t, sb_flags), 0 }, | |
110 | { offsetof(xfs_sb_t, sb_shared_vn), 0 }, | |
111 | { offsetof(xfs_sb_t, sb_inoalignmt), 0 }, | |
112 | { offsetof(xfs_sb_t, sb_unit), 0 }, | |
113 | { offsetof(xfs_sb_t, sb_width), 0 }, | |
114 | { offsetof(xfs_sb_t, sb_dirblklog), 0 }, | |
115 | { offsetof(xfs_sb_t, sb_logsectlog), 0 }, | |
116 | { offsetof(xfs_sb_t, sb_logsectsize),0 }, | |
117 | { offsetof(xfs_sb_t, sb_logsunit), 0 }, | |
118 | { offsetof(xfs_sb_t, sb_features2), 0 }, | |
ee1c0908 | 119 | { offsetof(xfs_sb_t, sb_bad_features2), 0 }, |
1da177e4 LT |
120 | { sizeof(xfs_sb_t), 0 } |
121 | }; | |
122 | ||
27174203 CH |
123 | static DEFINE_MUTEX(xfs_uuid_table_mutex); |
124 | static int xfs_uuid_table_size; | |
125 | static uuid_t *xfs_uuid_table; | |
126 | ||
127 | /* | |
128 | * See if the UUID is unique among mounted XFS filesystems. | |
129 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. | |
130 | */ | |
131 | STATIC int | |
132 | xfs_uuid_mount( | |
133 | struct xfs_mount *mp) | |
134 | { | |
135 | uuid_t *uuid = &mp->m_sb.sb_uuid; | |
136 | int hole, i; | |
137 | ||
138 | if (mp->m_flags & XFS_MOUNT_NOUUID) | |
139 | return 0; | |
140 | ||
141 | if (uuid_is_nil(uuid)) { | |
142 | cmn_err(CE_WARN, | |
143 | "XFS: Filesystem %s has nil UUID - can't mount", | |
144 | mp->m_fsname); | |
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); | |
172 | cmn_err(CE_WARN, "XFS: Filesystem %s has duplicate UUID - can't mount", | |
173 | mp->m_fsname); | |
174 | return XFS_ERROR(EINVAL); | |
175 | } | |
176 | ||
177 | STATIC void | |
178 | xfs_uuid_unmount( | |
179 | struct xfs_mount *mp) | |
180 | { | |
181 | uuid_t *uuid = &mp->m_sb.sb_uuid; | |
182 | int i; | |
183 | ||
184 | if (mp->m_flags & XFS_MOUNT_NOUUID) | |
185 | return; | |
186 | ||
187 | mutex_lock(&xfs_uuid_table_mutex); | |
188 | for (i = 0; i < xfs_uuid_table_size; i++) { | |
189 | if (uuid_is_nil(&xfs_uuid_table[i])) | |
190 | continue; | |
191 | if (!uuid_equal(uuid, &xfs_uuid_table[i])) | |
192 | continue; | |
193 | memset(&xfs_uuid_table[i], 0, sizeof(uuid_t)); | |
194 | break; | |
195 | } | |
196 | ASSERT(i < xfs_uuid_table_size); | |
197 | mutex_unlock(&xfs_uuid_table_mutex); | |
198 | } | |
199 | ||
200 | ||
1da177e4 LT |
201 | /* |
202 | * Free up the resources associated with a mount structure. Assume that | |
203 | * the structure was initially zeroed, so we can tell which fields got | |
204 | * initialized. | |
205 | */ | |
c962fb79 | 206 | STATIC void |
ff4f038c | 207 | xfs_free_perag( |
745f6919 | 208 | xfs_mount_t *mp) |
1da177e4 | 209 | { |
1da177e4 LT |
210 | if (mp->m_perag) { |
211 | int agno; | |
212 | ||
213 | for (agno = 0; agno < mp->m_maxagi; agno++) | |
214 | if (mp->m_perag[agno].pagb_list) | |
f0e2d93c DV |
215 | kmem_free(mp->m_perag[agno].pagb_list); |
216 | kmem_free(mp->m_perag); | |
1da177e4 | 217 | } |
1da177e4 LT |
218 | } |
219 | ||
4cc929ee NS |
220 | /* |
221 | * Check size of device based on the (data/realtime) block count. | |
222 | * Note: this check is used by the growfs code as well as mount. | |
223 | */ | |
224 | int | |
225 | xfs_sb_validate_fsb_count( | |
226 | xfs_sb_t *sbp, | |
227 | __uint64_t nblocks) | |
228 | { | |
229 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); | |
230 | ASSERT(sbp->sb_blocklog >= BBSHIFT); | |
231 | ||
232 | #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ | |
233 | if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) | |
234 | return E2BIG; | |
235 | #else /* Limited by UINT_MAX of sectors */ | |
236 | if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX) | |
237 | return E2BIG; | |
238 | #endif | |
239 | return 0; | |
240 | } | |
1da177e4 LT |
241 | |
242 | /* | |
243 | * Check the validity of the SB found. | |
244 | */ | |
245 | STATIC int | |
246 | xfs_mount_validate_sb( | |
247 | xfs_mount_t *mp, | |
764d1f89 NS |
248 | xfs_sb_t *sbp, |
249 | int flags) | |
1da177e4 LT |
250 | { |
251 | /* | |
252 | * If the log device and data device have the | |
253 | * same device number, the log is internal. | |
254 | * Consequently, the sb_logstart should be non-zero. If | |
255 | * we have a zero sb_logstart in this case, we may be trying to mount | |
256 | * a volume filesystem in a non-volume manner. | |
257 | */ | |
258 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { | |
764d1f89 | 259 | xfs_fs_mount_cmn_err(flags, "bad magic number"); |
1da177e4 LT |
260 | return XFS_ERROR(EWRONGFS); |
261 | } | |
262 | ||
62118709 | 263 | if (!xfs_sb_good_version(sbp)) { |
764d1f89 | 264 | xfs_fs_mount_cmn_err(flags, "bad version"); |
1da177e4 LT |
265 | return XFS_ERROR(EWRONGFS); |
266 | } | |
267 | ||
268 | if (unlikely( | |
269 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { | |
764d1f89 NS |
270 | xfs_fs_mount_cmn_err(flags, |
271 | "filesystem is marked as having an external log; " | |
272 | "specify logdev on the\nmount command line."); | |
273 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
274 | } |
275 | ||
276 | if (unlikely( | |
277 | sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { | |
764d1f89 NS |
278 | xfs_fs_mount_cmn_err(flags, |
279 | "filesystem is marked as having an internal log; " | |
280 | "do not specify logdev on\nthe mount command line."); | |
281 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
282 | } |
283 | ||
284 | /* | |
285 | * More sanity checking. These were stolen directly from | |
286 | * xfs_repair. | |
287 | */ | |
288 | if (unlikely( | |
289 | sbp->sb_agcount <= 0 || | |
290 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
291 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
292 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
293 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
2ac00af7 | 294 | sbp->sb_sectsize != (1 << sbp->sb_sectlog) || |
1da177e4 LT |
295 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || |
296 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
297 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
298 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
2ac00af7 | 299 | sbp->sb_blocksize != (1 << sbp->sb_blocklog) || |
1da177e4 LT |
300 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || |
301 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
9f989c94 NS |
302 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || |
303 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
2ac00af7 | 304 | sbp->sb_inodesize != (1 << sbp->sb_inodelog) || |
9f989c94 | 305 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || |
1da177e4 LT |
306 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || |
307 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
e50bd16f | 308 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) { |
764d1f89 | 309 | xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed"); |
1da177e4 LT |
310 | return XFS_ERROR(EFSCORRUPTED); |
311 | } | |
312 | ||
313 | /* | |
314 | * Sanity check AG count, size fields against data size field | |
315 | */ | |
316 | if (unlikely( | |
317 | sbp->sb_dblocks == 0 || | |
318 | sbp->sb_dblocks > | |
319 | (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks || | |
320 | sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) * | |
321 | sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) { | |
764d1f89 | 322 | xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed"); |
1da177e4 LT |
323 | return XFS_ERROR(EFSCORRUPTED); |
324 | } | |
325 | ||
2edbddd5 LM |
326 | /* |
327 | * Until this is fixed only page-sized or smaller data blocks work. | |
328 | */ | |
329 | if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { | |
330 | xfs_fs_mount_cmn_err(flags, | |
331 | "file system with blocksize %d bytes", | |
332 | sbp->sb_blocksize); | |
333 | xfs_fs_mount_cmn_err(flags, | |
334 | "only pagesize (%ld) or less will currently work.", | |
335 | PAGE_SIZE); | |
336 | return XFS_ERROR(ENOSYS); | |
337 | } | |
338 | ||
1a5902c5 CH |
339 | /* |
340 | * Currently only very few inode sizes are supported. | |
341 | */ | |
342 | switch (sbp->sb_inodesize) { | |
343 | case 256: | |
344 | case 512: | |
345 | case 1024: | |
346 | case 2048: | |
347 | break; | |
348 | default: | |
349 | xfs_fs_mount_cmn_err(flags, | |
350 | "inode size of %d bytes not supported", | |
351 | sbp->sb_inodesize); | |
352 | return XFS_ERROR(ENOSYS); | |
353 | } | |
354 | ||
4cc929ee NS |
355 | if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || |
356 | xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { | |
764d1f89 NS |
357 | xfs_fs_mount_cmn_err(flags, |
358 | "file system too large to be mounted on this system."); | |
1da177e4 LT |
359 | return XFS_ERROR(E2BIG); |
360 | } | |
361 | ||
362 | if (unlikely(sbp->sb_inprogress)) { | |
764d1f89 | 363 | xfs_fs_mount_cmn_err(flags, "file system busy"); |
1da177e4 LT |
364 | return XFS_ERROR(EFSCORRUPTED); |
365 | } | |
366 | ||
de20614b NS |
367 | /* |
368 | * Version 1 directory format has never worked on Linux. | |
369 | */ | |
62118709 | 370 | if (unlikely(!xfs_sb_version_hasdirv2(sbp))) { |
764d1f89 NS |
371 | xfs_fs_mount_cmn_err(flags, |
372 | "file system using version 1 directory format"); | |
de20614b NS |
373 | return XFS_ERROR(ENOSYS); |
374 | } | |
375 | ||
1da177e4 LT |
376 | return 0; |
377 | } | |
378 | ||
da353b0d DC |
379 | STATIC void |
380 | xfs_initialize_perag_icache( | |
381 | xfs_perag_t *pag) | |
382 | { | |
383 | if (!pag->pag_ici_init) { | |
384 | rwlock_init(&pag->pag_ici_lock); | |
385 | INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); | |
386 | pag->pag_ici_init = 1; | |
387 | } | |
388 | } | |
389 | ||
1da177e4 | 390 | xfs_agnumber_t |
c11e2c36 | 391 | xfs_initialize_perag( |
c11e2c36 NS |
392 | xfs_mount_t *mp, |
393 | xfs_agnumber_t agcount) | |
1da177e4 LT |
394 | { |
395 | xfs_agnumber_t index, max_metadata; | |
396 | xfs_perag_t *pag; | |
397 | xfs_agino_t agino; | |
398 | xfs_ino_t ino; | |
399 | xfs_sb_t *sbp = &mp->m_sb; | |
400 | xfs_ino_t max_inum = XFS_MAXINUMBER_32; | |
401 | ||
402 | /* Check to see if the filesystem can overflow 32 bit inodes */ | |
403 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); | |
404 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); | |
405 | ||
406 | /* Clear the mount flag if no inode can overflow 32 bits | |
407 | * on this filesystem, or if specifically requested.. | |
408 | */ | |
bd186aa9 | 409 | if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > max_inum) { |
1da177e4 LT |
410 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
411 | } else { | |
412 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; | |
413 | } | |
414 | ||
415 | /* If we can overflow then setup the ag headers accordingly */ | |
416 | if (mp->m_flags & XFS_MOUNT_32BITINODES) { | |
417 | /* Calculate how much should be reserved for inodes to | |
418 | * meet the max inode percentage. | |
419 | */ | |
420 | if (mp->m_maxicount) { | |
421 | __uint64_t icount; | |
422 | ||
423 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
424 | do_div(icount, 100); | |
425 | icount += sbp->sb_agblocks - 1; | |
a749ee86 | 426 | do_div(icount, sbp->sb_agblocks); |
1da177e4 LT |
427 | max_metadata = icount; |
428 | } else { | |
429 | max_metadata = agcount; | |
430 | } | |
431 | for (index = 0; index < agcount; index++) { | |
432 | ino = XFS_AGINO_TO_INO(mp, index, agino); | |
433 | if (ino > max_inum) { | |
434 | index++; | |
435 | break; | |
436 | } | |
437 | ||
c41564b5 | 438 | /* This ag is preferred for inodes */ |
1da177e4 LT |
439 | pag = &mp->m_perag[index]; |
440 | pag->pagi_inodeok = 1; | |
441 | if (index < max_metadata) | |
442 | pag->pagf_metadata = 1; | |
da353b0d | 443 | xfs_initialize_perag_icache(pag); |
1da177e4 LT |
444 | } |
445 | } else { | |
446 | /* Setup default behavior for smaller filesystems */ | |
447 | for (index = 0; index < agcount; index++) { | |
448 | pag = &mp->m_perag[index]; | |
449 | pag->pagi_inodeok = 1; | |
da353b0d | 450 | xfs_initialize_perag_icache(pag); |
1da177e4 LT |
451 | } |
452 | } | |
453 | return index; | |
454 | } | |
455 | ||
2bdf7cd0 CH |
456 | void |
457 | xfs_sb_from_disk( | |
458 | xfs_sb_t *to, | |
459 | xfs_dsb_t *from) | |
460 | { | |
461 | to->sb_magicnum = be32_to_cpu(from->sb_magicnum); | |
462 | to->sb_blocksize = be32_to_cpu(from->sb_blocksize); | |
463 | to->sb_dblocks = be64_to_cpu(from->sb_dblocks); | |
464 | to->sb_rblocks = be64_to_cpu(from->sb_rblocks); | |
465 | to->sb_rextents = be64_to_cpu(from->sb_rextents); | |
466 | memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); | |
467 | to->sb_logstart = be64_to_cpu(from->sb_logstart); | |
468 | to->sb_rootino = be64_to_cpu(from->sb_rootino); | |
469 | to->sb_rbmino = be64_to_cpu(from->sb_rbmino); | |
470 | to->sb_rsumino = be64_to_cpu(from->sb_rsumino); | |
471 | to->sb_rextsize = be32_to_cpu(from->sb_rextsize); | |
472 | to->sb_agblocks = be32_to_cpu(from->sb_agblocks); | |
473 | to->sb_agcount = be32_to_cpu(from->sb_agcount); | |
474 | to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); | |
475 | to->sb_logblocks = be32_to_cpu(from->sb_logblocks); | |
476 | to->sb_versionnum = be16_to_cpu(from->sb_versionnum); | |
477 | to->sb_sectsize = be16_to_cpu(from->sb_sectsize); | |
478 | to->sb_inodesize = be16_to_cpu(from->sb_inodesize); | |
479 | to->sb_inopblock = be16_to_cpu(from->sb_inopblock); | |
480 | memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); | |
481 | to->sb_blocklog = from->sb_blocklog; | |
482 | to->sb_sectlog = from->sb_sectlog; | |
483 | to->sb_inodelog = from->sb_inodelog; | |
484 | to->sb_inopblog = from->sb_inopblog; | |
485 | to->sb_agblklog = from->sb_agblklog; | |
486 | to->sb_rextslog = from->sb_rextslog; | |
487 | to->sb_inprogress = from->sb_inprogress; | |
488 | to->sb_imax_pct = from->sb_imax_pct; | |
489 | to->sb_icount = be64_to_cpu(from->sb_icount); | |
490 | to->sb_ifree = be64_to_cpu(from->sb_ifree); | |
491 | to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); | |
492 | to->sb_frextents = be64_to_cpu(from->sb_frextents); | |
493 | to->sb_uquotino = be64_to_cpu(from->sb_uquotino); | |
494 | to->sb_gquotino = be64_to_cpu(from->sb_gquotino); | |
495 | to->sb_qflags = be16_to_cpu(from->sb_qflags); | |
496 | to->sb_flags = from->sb_flags; | |
497 | to->sb_shared_vn = from->sb_shared_vn; | |
498 | to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); | |
499 | to->sb_unit = be32_to_cpu(from->sb_unit); | |
500 | to->sb_width = be32_to_cpu(from->sb_width); | |
501 | to->sb_dirblklog = from->sb_dirblklog; | |
502 | to->sb_logsectlog = from->sb_logsectlog; | |
503 | to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); | |
504 | to->sb_logsunit = be32_to_cpu(from->sb_logsunit); | |
505 | to->sb_features2 = be32_to_cpu(from->sb_features2); | |
ee1c0908 | 506 | to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); |
2bdf7cd0 CH |
507 | } |
508 | ||
1da177e4 | 509 | /* |
2bdf7cd0 | 510 | * Copy in core superblock to ondisk one. |
1da177e4 | 511 | * |
2bdf7cd0 | 512 | * The fields argument is mask of superblock fields to copy. |
1da177e4 LT |
513 | */ |
514 | void | |
2bdf7cd0 CH |
515 | xfs_sb_to_disk( |
516 | xfs_dsb_t *to, | |
517 | xfs_sb_t *from, | |
1da177e4 LT |
518 | __int64_t fields) |
519 | { | |
2bdf7cd0 CH |
520 | xfs_caddr_t to_ptr = (xfs_caddr_t)to; |
521 | xfs_caddr_t from_ptr = (xfs_caddr_t)from; | |
1da177e4 LT |
522 | xfs_sb_field_t f; |
523 | int first; | |
524 | int size; | |
525 | ||
1da177e4 | 526 | ASSERT(fields); |
1da177e4 LT |
527 | if (!fields) |
528 | return; | |
529 | ||
1da177e4 LT |
530 | while (fields) { |
531 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
532 | first = xfs_sb_info[f].offset; | |
533 | size = xfs_sb_info[f + 1].offset - first; | |
534 | ||
535 | ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); | |
536 | ||
537 | if (size == 1 || xfs_sb_info[f].type == 1) { | |
2bdf7cd0 | 538 | memcpy(to_ptr + first, from_ptr + first, size); |
1da177e4 LT |
539 | } else { |
540 | switch (size) { | |
541 | case 2: | |
2bdf7cd0 CH |
542 | *(__be16 *)(to_ptr + first) = |
543 | cpu_to_be16(*(__u16 *)(from_ptr + first)); | |
1da177e4 LT |
544 | break; |
545 | case 4: | |
2bdf7cd0 CH |
546 | *(__be32 *)(to_ptr + first) = |
547 | cpu_to_be32(*(__u32 *)(from_ptr + first)); | |
1da177e4 LT |
548 | break; |
549 | case 8: | |
2bdf7cd0 CH |
550 | *(__be64 *)(to_ptr + first) = |
551 | cpu_to_be64(*(__u64 *)(from_ptr + first)); | |
1da177e4 LT |
552 | break; |
553 | default: | |
554 | ASSERT(0); | |
555 | } | |
556 | } | |
557 | ||
558 | fields &= ~(1LL << f); | |
559 | } | |
560 | } | |
561 | ||
562 | /* | |
563 | * xfs_readsb | |
564 | * | |
565 | * Does the initial read of the superblock. | |
566 | */ | |
567 | int | |
764d1f89 | 568 | xfs_readsb(xfs_mount_t *mp, int flags) |
1da177e4 LT |
569 | { |
570 | unsigned int sector_size; | |
571 | unsigned int extra_flags; | |
572 | xfs_buf_t *bp; | |
1da177e4 LT |
573 | int error; |
574 | ||
575 | ASSERT(mp->m_sb_bp == NULL); | |
576 | ASSERT(mp->m_ddev_targp != NULL); | |
577 | ||
578 | /* | |
579 | * Allocate a (locked) buffer to hold the superblock. | |
580 | * This will be kept around at all times to optimize | |
581 | * access to the superblock. | |
582 | */ | |
583 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); | |
584 | extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED; | |
585 | ||
586 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
587 | BTOBB(sector_size), extra_flags); | |
588 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 589 | xfs_fs_mount_cmn_err(flags, "SB read failed"); |
1da177e4 LT |
590 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
591 | goto fail; | |
592 | } | |
593 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
594 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
595 | ||
596 | /* | |
597 | * Initialize the mount structure from the superblock. | |
598 | * But first do some basic consistency checking. | |
599 | */ | |
2bdf7cd0 | 600 | xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp)); |
1da177e4 | 601 | |
764d1f89 | 602 | error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags); |
1da177e4 | 603 | if (error) { |
764d1f89 | 604 | xfs_fs_mount_cmn_err(flags, "SB validate failed"); |
1da177e4 LT |
605 | goto fail; |
606 | } | |
607 | ||
608 | /* | |
609 | * We must be able to do sector-sized and sector-aligned IO. | |
610 | */ | |
611 | if (sector_size > mp->m_sb.sb_sectsize) { | |
764d1f89 NS |
612 | xfs_fs_mount_cmn_err(flags, |
613 | "device supports only %u byte sectors (not %u)", | |
1da177e4 LT |
614 | sector_size, mp->m_sb.sb_sectsize); |
615 | error = ENOSYS; | |
616 | goto fail; | |
617 | } | |
618 | ||
619 | /* | |
620 | * If device sector size is smaller than the superblock size, | |
621 | * re-read the superblock so the buffer is correctly sized. | |
622 | */ | |
623 | if (sector_size < mp->m_sb.sb_sectsize) { | |
624 | XFS_BUF_UNMANAGE(bp); | |
625 | xfs_buf_relse(bp); | |
626 | sector_size = mp->m_sb.sb_sectsize; | |
627 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
628 | BTOBB(sector_size), extra_flags); | |
629 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 630 | xfs_fs_mount_cmn_err(flags, "SB re-read failed"); |
1da177e4 LT |
631 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
632 | goto fail; | |
633 | } | |
634 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
635 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
636 | } | |
637 | ||
5478eead LM |
638 | /* Initialize per-cpu counters */ |
639 | xfs_icsb_reinit_counters(mp); | |
8d280b98 | 640 | |
1da177e4 LT |
641 | mp->m_sb_bp = bp; |
642 | xfs_buf_relse(bp); | |
643 | ASSERT(XFS_BUF_VALUSEMA(bp) > 0); | |
644 | return 0; | |
645 | ||
646 | fail: | |
647 | if (bp) { | |
648 | XFS_BUF_UNMANAGE(bp); | |
649 | xfs_buf_relse(bp); | |
650 | } | |
651 | return error; | |
652 | } | |
653 | ||
654 | ||
655 | /* | |
656 | * xfs_mount_common | |
657 | * | |
658 | * Mount initialization code establishing various mount | |
659 | * fields from the superblock associated with the given | |
660 | * mount structure | |
661 | */ | |
ba0f32d4 | 662 | STATIC void |
1da177e4 LT |
663 | xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) |
664 | { | |
1da177e4 | 665 | mp->m_agfrotor = mp->m_agirotor = 0; |
007c61c6 | 666 | spin_lock_init(&mp->m_agirotor_lock); |
1da177e4 LT |
667 | mp->m_maxagi = mp->m_sb.sb_agcount; |
668 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
669 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
670 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
671 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
672 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
1da177e4 LT |
673 | mp->m_blockmask = sbp->sb_blocksize - 1; |
674 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
675 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
1da177e4 | 676 | |
60197e8d CH |
677 | mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); |
678 | mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
679 | mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; | |
680 | mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; | |
681 | ||
682 | mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1); | |
683 | mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0); | |
684 | mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2; | |
685 | mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2; | |
686 | ||
687 | mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); | |
688 | mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); | |
689 | mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; | |
690 | mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; | |
1da177e4 LT |
691 | |
692 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
693 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
694 | sbp->sb_inopblock); | |
695 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
696 | } | |
92821e2b DC |
697 | |
698 | /* | |
699 | * xfs_initialize_perag_data | |
700 | * | |
701 | * Read in each per-ag structure so we can count up the number of | |
702 | * allocated inodes, free inodes and used filesystem blocks as this | |
703 | * information is no longer persistent in the superblock. Once we have | |
704 | * this information, write it into the in-core superblock structure. | |
705 | */ | |
706 | STATIC int | |
707 | xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount) | |
708 | { | |
709 | xfs_agnumber_t index; | |
710 | xfs_perag_t *pag; | |
711 | xfs_sb_t *sbp = &mp->m_sb; | |
712 | uint64_t ifree = 0; | |
713 | uint64_t ialloc = 0; | |
714 | uint64_t bfree = 0; | |
715 | uint64_t bfreelst = 0; | |
716 | uint64_t btree = 0; | |
717 | int error; | |
92821e2b DC |
718 | |
719 | for (index = 0; index < agcount; index++) { | |
720 | /* | |
721 | * read the agf, then the agi. This gets us | |
9da096fd | 722 | * all the information we need and populates the |
92821e2b DC |
723 | * per-ag structures for us. |
724 | */ | |
725 | error = xfs_alloc_pagf_init(mp, NULL, index, 0); | |
726 | if (error) | |
727 | return error; | |
728 | ||
729 | error = xfs_ialloc_pagi_init(mp, NULL, index); | |
730 | if (error) | |
731 | return error; | |
732 | pag = &mp->m_perag[index]; | |
733 | ifree += pag->pagi_freecount; | |
734 | ialloc += pag->pagi_count; | |
735 | bfree += pag->pagf_freeblks; | |
736 | bfreelst += pag->pagf_flcount; | |
737 | btree += pag->pagf_btreeblks; | |
738 | } | |
739 | /* | |
740 | * Overwrite incore superblock counters with just-read data | |
741 | */ | |
3685c2a1 | 742 | spin_lock(&mp->m_sb_lock); |
92821e2b DC |
743 | sbp->sb_ifree = ifree; |
744 | sbp->sb_icount = ialloc; | |
745 | sbp->sb_fdblocks = bfree + bfreelst + btree; | |
3685c2a1 | 746 | spin_unlock(&mp->m_sb_lock); |
92821e2b DC |
747 | |
748 | /* Fixup the per-cpu counters as well. */ | |
749 | xfs_icsb_reinit_counters(mp); | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
1da177e4 | 754 | /* |
0771fb45 | 755 | * Update alignment values based on mount options and sb values |
1da177e4 | 756 | */ |
0771fb45 | 757 | STATIC int |
7884bc86 | 758 | xfs_update_alignment(xfs_mount_t *mp) |
1da177e4 | 759 | { |
1da177e4 | 760 | xfs_sb_t *sbp = &(mp->m_sb); |
1da177e4 | 761 | |
4249023a | 762 | if (mp->m_dalign) { |
1da177e4 LT |
763 | /* |
764 | * If stripe unit and stripe width are not multiples | |
765 | * of the fs blocksize turn off alignment. | |
766 | */ | |
767 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || | |
768 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { | |
769 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
770 | cmn_err(CE_WARN, | |
771 | "XFS: alignment check 1 failed"); | |
0771fb45 | 772 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
773 | } |
774 | mp->m_dalign = mp->m_swidth = 0; | |
775 | } else { | |
776 | /* | |
777 | * Convert the stripe unit and width to FSBs. | |
778 | */ | |
779 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); | |
780 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { | |
781 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
0771fb45 | 782 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
783 | } |
784 | xfs_fs_cmn_err(CE_WARN, mp, | |
785 | "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)", | |
786 | mp->m_dalign, mp->m_swidth, | |
787 | sbp->sb_agblocks); | |
788 | ||
789 | mp->m_dalign = 0; | |
790 | mp->m_swidth = 0; | |
791 | } else if (mp->m_dalign) { | |
792 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); | |
793 | } else { | |
794 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
795 | xfs_fs_cmn_err(CE_WARN, mp, | |
796 | "stripe alignment turned off: sunit(%d) less than bsize(%d)", | |
797 | mp->m_dalign, | |
798 | mp->m_blockmask +1); | |
0771fb45 | 799 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
800 | } |
801 | mp->m_swidth = 0; | |
802 | } | |
803 | } | |
804 | ||
805 | /* | |
806 | * Update superblock with new values | |
807 | * and log changes | |
808 | */ | |
62118709 | 809 | if (xfs_sb_version_hasdalign(sbp)) { |
1da177e4 LT |
810 | if (sbp->sb_unit != mp->m_dalign) { |
811 | sbp->sb_unit = mp->m_dalign; | |
7884bc86 | 812 | mp->m_update_flags |= XFS_SB_UNIT; |
1da177e4 LT |
813 | } |
814 | if (sbp->sb_width != mp->m_swidth) { | |
815 | sbp->sb_width = mp->m_swidth; | |
7884bc86 | 816 | mp->m_update_flags |= XFS_SB_WIDTH; |
1da177e4 LT |
817 | } |
818 | } | |
819 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && | |
62118709 | 820 | xfs_sb_version_hasdalign(&mp->m_sb)) { |
1da177e4 LT |
821 | mp->m_dalign = sbp->sb_unit; |
822 | mp->m_swidth = sbp->sb_width; | |
823 | } | |
824 | ||
0771fb45 ES |
825 | return 0; |
826 | } | |
1da177e4 | 827 | |
0771fb45 ES |
828 | /* |
829 | * Set the maximum inode count for this filesystem | |
830 | */ | |
831 | STATIC void | |
832 | xfs_set_maxicount(xfs_mount_t *mp) | |
833 | { | |
834 | xfs_sb_t *sbp = &(mp->m_sb); | |
835 | __uint64_t icount; | |
1da177e4 | 836 | |
0771fb45 ES |
837 | if (sbp->sb_imax_pct) { |
838 | /* | |
839 | * Make sure the maximum inode count is a multiple | |
840 | * of the units we allocate inodes in. | |
1da177e4 | 841 | */ |
1da177e4 LT |
842 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; |
843 | do_div(icount, 100); | |
844 | do_div(icount, mp->m_ialloc_blks); | |
845 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << | |
846 | sbp->sb_inopblog; | |
0771fb45 | 847 | } else { |
1da177e4 | 848 | mp->m_maxicount = 0; |
1da177e4 | 849 | } |
0771fb45 ES |
850 | } |
851 | ||
852 | /* | |
853 | * Set the default minimum read and write sizes unless | |
854 | * already specified in a mount option. | |
855 | * We use smaller I/O sizes when the file system | |
856 | * is being used for NFS service (wsync mount option). | |
857 | */ | |
858 | STATIC void | |
859 | xfs_set_rw_sizes(xfs_mount_t *mp) | |
860 | { | |
861 | xfs_sb_t *sbp = &(mp->m_sb); | |
862 | int readio_log, writeio_log; | |
1da177e4 | 863 | |
1da177e4 LT |
864 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { |
865 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
866 | readio_log = XFS_WSYNC_READIO_LOG; | |
867 | writeio_log = XFS_WSYNC_WRITEIO_LOG; | |
868 | } else { | |
869 | readio_log = XFS_READIO_LOG_LARGE; | |
870 | writeio_log = XFS_WRITEIO_LOG_LARGE; | |
871 | } | |
872 | } else { | |
873 | readio_log = mp->m_readio_log; | |
874 | writeio_log = mp->m_writeio_log; | |
875 | } | |
876 | ||
1da177e4 LT |
877 | if (sbp->sb_blocklog > readio_log) { |
878 | mp->m_readio_log = sbp->sb_blocklog; | |
879 | } else { | |
880 | mp->m_readio_log = readio_log; | |
881 | } | |
882 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); | |
883 | if (sbp->sb_blocklog > writeio_log) { | |
884 | mp->m_writeio_log = sbp->sb_blocklog; | |
885 | } else { | |
886 | mp->m_writeio_log = writeio_log; | |
887 | } | |
888 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); | |
0771fb45 | 889 | } |
1da177e4 | 890 | |
0771fb45 ES |
891 | /* |
892 | * Set whether we're using inode alignment. | |
893 | */ | |
894 | STATIC void | |
895 | xfs_set_inoalignment(xfs_mount_t *mp) | |
896 | { | |
62118709 | 897 | if (xfs_sb_version_hasalign(&mp->m_sb) && |
1da177e4 LT |
898 | mp->m_sb.sb_inoalignmt >= |
899 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) | |
900 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; | |
901 | else | |
902 | mp->m_inoalign_mask = 0; | |
903 | /* | |
904 | * If we are using stripe alignment, check whether | |
905 | * the stripe unit is a multiple of the inode alignment | |
906 | */ | |
907 | if (mp->m_dalign && mp->m_inoalign_mask && | |
908 | !(mp->m_dalign & mp->m_inoalign_mask)) | |
909 | mp->m_sinoalign = mp->m_dalign; | |
910 | else | |
911 | mp->m_sinoalign = 0; | |
0771fb45 ES |
912 | } |
913 | ||
914 | /* | |
915 | * Check that the data (and log if separate) are an ok size. | |
916 | */ | |
917 | STATIC int | |
4249023a | 918 | xfs_check_sizes(xfs_mount_t *mp) |
0771fb45 ES |
919 | { |
920 | xfs_buf_t *bp; | |
921 | xfs_daddr_t d; | |
922 | int error; | |
923 | ||
1da177e4 LT |
924 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); |
925 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { | |
926 | cmn_err(CE_WARN, "XFS: size check 1 failed"); | |
0771fb45 | 927 | return XFS_ERROR(E2BIG); |
1da177e4 LT |
928 | } |
929 | error = xfs_read_buf(mp, mp->m_ddev_targp, | |
930 | d - XFS_FSS_TO_BB(mp, 1), | |
931 | XFS_FSS_TO_BB(mp, 1), 0, &bp); | |
932 | if (!error) { | |
933 | xfs_buf_relse(bp); | |
934 | } else { | |
935 | cmn_err(CE_WARN, "XFS: size check 2 failed"); | |
0771fb45 | 936 | if (error == ENOSPC) |
1da177e4 | 937 | error = XFS_ERROR(E2BIG); |
0771fb45 | 938 | return error; |
1da177e4 LT |
939 | } |
940 | ||
4249023a | 941 | if (mp->m_logdev_targp != mp->m_ddev_targp) { |
1da177e4 LT |
942 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); |
943 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { | |
944 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
0771fb45 | 945 | return XFS_ERROR(E2BIG); |
1da177e4 LT |
946 | } |
947 | error = xfs_read_buf(mp, mp->m_logdev_targp, | |
948 | d - XFS_FSB_TO_BB(mp, 1), | |
949 | XFS_FSB_TO_BB(mp, 1), 0, &bp); | |
950 | if (!error) { | |
951 | xfs_buf_relse(bp); | |
952 | } else { | |
953 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
0771fb45 | 954 | if (error == ENOSPC) |
1da177e4 | 955 | error = XFS_ERROR(E2BIG); |
0771fb45 ES |
956 | return error; |
957 | } | |
958 | } | |
959 | return 0; | |
960 | } | |
961 | ||
962 | /* | |
0771fb45 ES |
963 | * This function does the following on an initial mount of a file system: |
964 | * - reads the superblock from disk and init the mount struct | |
965 | * - if we're a 32-bit kernel, do a size check on the superblock | |
966 | * so we don't mount terabyte filesystems | |
967 | * - init mount struct realtime fields | |
968 | * - allocate inode hash table for fs | |
969 | * - init directory manager | |
970 | * - perform recovery and init the log manager | |
971 | */ | |
972 | int | |
973 | xfs_mountfs( | |
4249023a | 974 | xfs_mount_t *mp) |
0771fb45 ES |
975 | { |
976 | xfs_sb_t *sbp = &(mp->m_sb); | |
977 | xfs_inode_t *rip; | |
0771fb45 | 978 | __uint64_t resblks; |
0771fb45 | 979 | uint quotamount, quotaflags; |
0771fb45 ES |
980 | int error = 0; |
981 | ||
0771fb45 ES |
982 | xfs_mount_common(mp, sbp); |
983 | ||
ee1c0908 | 984 | /* |
e6957ea4 ES |
985 | * Check for a mismatched features2 values. Older kernels |
986 | * read & wrote into the wrong sb offset for sb_features2 | |
987 | * on some platforms due to xfs_sb_t not being 64bit size aligned | |
988 | * when sb_features2 was added, which made older superblock | |
989 | * reading/writing routines swap it as a 64-bit value. | |
ee1c0908 | 990 | * |
e6957ea4 ES |
991 | * For backwards compatibility, we make both slots equal. |
992 | * | |
993 | * If we detect a mismatched field, we OR the set bits into the | |
994 | * existing features2 field in case it has already been modified; we | |
995 | * don't want to lose any features. We then update the bad location | |
996 | * with the ORed value so that older kernels will see any features2 | |
997 | * flags, and mark the two fields as needing updates once the | |
998 | * transaction subsystem is online. | |
ee1c0908 | 999 | */ |
e6957ea4 | 1000 | if (xfs_sb_has_mismatched_features2(sbp)) { |
ee1c0908 DC |
1001 | cmn_err(CE_WARN, |
1002 | "XFS: correcting sb_features alignment problem"); | |
1003 | sbp->sb_features2 |= sbp->sb_bad_features2; | |
e6957ea4 | 1004 | sbp->sb_bad_features2 = sbp->sb_features2; |
7884bc86 | 1005 | mp->m_update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2; |
e6957ea4 ES |
1006 | |
1007 | /* | |
1008 | * Re-check for ATTR2 in case it was found in bad_features2 | |
1009 | * slot. | |
1010 | */ | |
7c12f296 TS |
1011 | if (xfs_sb_version_hasattr2(&mp->m_sb) && |
1012 | !(mp->m_flags & XFS_MOUNT_NOATTR2)) | |
e6957ea4 | 1013 | mp->m_flags |= XFS_MOUNT_ATTR2; |
7c12f296 TS |
1014 | } |
1015 | ||
1016 | if (xfs_sb_version_hasattr2(&mp->m_sb) && | |
1017 | (mp->m_flags & XFS_MOUNT_NOATTR2)) { | |
1018 | xfs_sb_version_removeattr2(&mp->m_sb); | |
7884bc86 | 1019 | mp->m_update_flags |= XFS_SB_FEATURES2; |
e6957ea4 | 1020 | |
7c12f296 TS |
1021 | /* update sb_versionnum for the clearing of the morebits */ |
1022 | if (!sbp->sb_features2) | |
7884bc86 | 1023 | mp->m_update_flags |= XFS_SB_VERSIONNUM; |
ee1c0908 DC |
1024 | } |
1025 | ||
0771fb45 ES |
1026 | /* |
1027 | * Check if sb_agblocks is aligned at stripe boundary | |
1028 | * If sb_agblocks is NOT aligned turn off m_dalign since | |
1029 | * allocator alignment is within an ag, therefore ag has | |
1030 | * to be aligned at stripe boundary. | |
1031 | */ | |
7884bc86 | 1032 | error = xfs_update_alignment(mp); |
0771fb45 | 1033 | if (error) |
f9057e3d | 1034 | goto out; |
0771fb45 ES |
1035 | |
1036 | xfs_alloc_compute_maxlevels(mp); | |
1037 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); | |
1038 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); | |
1039 | xfs_ialloc_compute_maxlevels(mp); | |
1040 | ||
1041 | xfs_set_maxicount(mp); | |
1042 | ||
1043 | mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog); | |
1044 | ||
27174203 CH |
1045 | error = xfs_uuid_mount(mp); |
1046 | if (error) | |
1047 | goto out; | |
1da177e4 | 1048 | |
0771fb45 ES |
1049 | /* |
1050 | * Set the minimum read and write sizes | |
1051 | */ | |
1052 | xfs_set_rw_sizes(mp); | |
1053 | ||
1054 | /* | |
1055 | * Set the inode cluster size. | |
1056 | * This may still be overridden by the file system | |
1057 | * block size if it is larger than the chosen cluster size. | |
1058 | */ | |
1059 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; | |
1060 | ||
1061 | /* | |
1062 | * Set inode alignment fields | |
1063 | */ | |
1064 | xfs_set_inoalignment(mp); | |
1065 | ||
1066 | /* | |
1067 | * Check that the data (and log if separate) are an ok size. | |
1068 | */ | |
4249023a | 1069 | error = xfs_check_sizes(mp); |
0771fb45 | 1070 | if (error) |
f9057e3d | 1071 | goto out_remove_uuid; |
0771fb45 | 1072 | |
1da177e4 LT |
1073 | /* |
1074 | * Initialize realtime fields in the mount structure | |
1075 | */ | |
0771fb45 ES |
1076 | error = xfs_rtmount_init(mp); |
1077 | if (error) { | |
1da177e4 | 1078 | cmn_err(CE_WARN, "XFS: RT mount failed"); |
f9057e3d | 1079 | goto out_remove_uuid; |
1da177e4 LT |
1080 | } |
1081 | ||
1da177e4 LT |
1082 | /* |
1083 | * Copies the low order bits of the timestamp and the randomly | |
1084 | * set "sequence" number out of a UUID. | |
1085 | */ | |
1086 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); | |
1087 | ||
1da177e4 LT |
1088 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ |
1089 | ||
f6c2d1fa | 1090 | xfs_dir_mount(mp); |
1da177e4 LT |
1091 | |
1092 | /* | |
1093 | * Initialize the attribute manager's entries. | |
1094 | */ | |
1095 | mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; | |
1096 | ||
1097 | /* | |
1098 | * Initialize the precomputed transaction reservations values. | |
1099 | */ | |
1100 | xfs_trans_init(mp); | |
1101 | ||
1da177e4 LT |
1102 | /* |
1103 | * Allocate and initialize the per-ag data. | |
1104 | */ | |
1105 | init_rwsem(&mp->m_peraglock); | |
d62c251f CH |
1106 | mp->m_perag = kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), |
1107 | KM_MAYFAIL); | |
1108 | if (!mp->m_perag) | |
f9057e3d | 1109 | goto out_remove_uuid; |
1da177e4 | 1110 | |
b267ce99 | 1111 | mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount); |
1da177e4 | 1112 | |
f9057e3d CH |
1113 | if (!sbp->sb_logblocks) { |
1114 | cmn_err(CE_WARN, "XFS: no log defined"); | |
1115 | XFS_ERROR_REPORT("xfs_mountfs", XFS_ERRLEVEL_LOW, mp); | |
1116 | error = XFS_ERROR(EFSCORRUPTED); | |
1117 | goto out_free_perag; | |
1118 | } | |
1119 | ||
1da177e4 LT |
1120 | /* |
1121 | * log's mount-time initialization. Perform 1st part recovery if needed | |
1122 | */ | |
f9057e3d CH |
1123 | error = xfs_log_mount(mp, mp->m_logdev_targp, |
1124 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), | |
1125 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); | |
1126 | if (error) { | |
1127 | cmn_err(CE_WARN, "XFS: log mount failed"); | |
1128 | goto out_free_perag; | |
1da177e4 LT |
1129 | } |
1130 | ||
92821e2b DC |
1131 | /* |
1132 | * Now the log is mounted, we know if it was an unclean shutdown or | |
1133 | * not. If it was, with the first phase of recovery has completed, we | |
1134 | * have consistent AG blocks on disk. We have not recovered EFIs yet, | |
1135 | * but they are recovered transactionally in the second recovery phase | |
1136 | * later. | |
1137 | * | |
1138 | * Hence we can safely re-initialise incore superblock counters from | |
1139 | * the per-ag data. These may not be correct if the filesystem was not | |
1140 | * cleanly unmounted, so we need to wait for recovery to finish before | |
1141 | * doing this. | |
1142 | * | |
1143 | * If the filesystem was cleanly unmounted, then we can trust the | |
1144 | * values in the superblock to be correct and we don't need to do | |
1145 | * anything here. | |
1146 | * | |
1147 | * If we are currently making the filesystem, the initialisation will | |
1148 | * fail as the perag data is in an undefined state. | |
1149 | */ | |
92821e2b DC |
1150 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && |
1151 | !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) && | |
1152 | !mp->m_sb.sb_inprogress) { | |
1153 | error = xfs_initialize_perag_data(mp, sbp->sb_agcount); | |
f9057e3d CH |
1154 | if (error) |
1155 | goto out_free_perag; | |
92821e2b | 1156 | } |
f9057e3d | 1157 | |
1da177e4 LT |
1158 | /* |
1159 | * Get and sanity-check the root inode. | |
1160 | * Save the pointer to it in the mount structure. | |
1161 | */ | |
1162 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0); | |
1163 | if (error) { | |
1164 | cmn_err(CE_WARN, "XFS: failed to read root inode"); | |
f9057e3d | 1165 | goto out_log_dealloc; |
1da177e4 LT |
1166 | } |
1167 | ||
1168 | ASSERT(rip != NULL); | |
1da177e4 LT |
1169 | |
1170 | if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) { | |
1171 | cmn_err(CE_WARN, "XFS: corrupted root inode"); | |
b6574520 NS |
1172 | cmn_err(CE_WARN, "Device %s - root %llu is not a directory", |
1173 | XFS_BUFTARG_NAME(mp->m_ddev_targp), | |
1174 | (unsigned long long)rip->i_ino); | |
1da177e4 LT |
1175 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
1176 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, | |
1177 | mp); | |
1178 | error = XFS_ERROR(EFSCORRUPTED); | |
f9057e3d | 1179 | goto out_rele_rip; |
1da177e4 LT |
1180 | } |
1181 | mp->m_rootip = rip; /* save it */ | |
1182 | ||
1183 | xfs_iunlock(rip, XFS_ILOCK_EXCL); | |
1184 | ||
1185 | /* | |
1186 | * Initialize realtime inode pointers in the mount structure | |
1187 | */ | |
0771fb45 ES |
1188 | error = xfs_rtmount_inodes(mp); |
1189 | if (error) { | |
1da177e4 LT |
1190 | /* |
1191 | * Free up the root inode. | |
1192 | */ | |
1193 | cmn_err(CE_WARN, "XFS: failed to read RT inodes"); | |
f9057e3d | 1194 | goto out_rele_rip; |
1da177e4 LT |
1195 | } |
1196 | ||
1197 | /* | |
7884bc86 CH |
1198 | * If this is a read-only mount defer the superblock updates until |
1199 | * the next remount into writeable mode. Otherwise we would never | |
1200 | * perform the update e.g. for the root filesystem. | |
1da177e4 | 1201 | */ |
7884bc86 CH |
1202 | if (mp->m_update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) { |
1203 | error = xfs_mount_log_sb(mp, mp->m_update_flags); | |
e5720eec DC |
1204 | if (error) { |
1205 | cmn_err(CE_WARN, "XFS: failed to write sb changes"); | |
b93b6e43 | 1206 | goto out_rtunmount; |
e5720eec DC |
1207 | } |
1208 | } | |
1da177e4 LT |
1209 | |
1210 | /* | |
1211 | * Initialise the XFS quota management subsystem for this mount | |
1212 | */ | |
0771fb45 ES |
1213 | error = XFS_QM_INIT(mp, "amount, "aflags); |
1214 | if (error) | |
b93b6e43 | 1215 | goto out_rtunmount; |
1da177e4 LT |
1216 | |
1217 | /* | |
1218 | * Finish recovering the file system. This part needed to be | |
1219 | * delayed until after the root and real-time bitmap inodes | |
1220 | * were consistently read in. | |
1221 | */ | |
4249023a | 1222 | error = xfs_log_mount_finish(mp); |
1da177e4 LT |
1223 | if (error) { |
1224 | cmn_err(CE_WARN, "XFS: log mount finish failed"); | |
b93b6e43 | 1225 | goto out_rtunmount; |
1da177e4 LT |
1226 | } |
1227 | ||
1228 | /* | |
1229 | * Complete the quota initialisation, post-log-replay component. | |
1230 | */ | |
4249023a | 1231 | error = XFS_QM_MOUNT(mp, quotamount, quotaflags); |
0771fb45 | 1232 | if (error) |
b93b6e43 | 1233 | goto out_rtunmount; |
1da177e4 | 1234 | |
84e1e99f DC |
1235 | /* |
1236 | * Now we are mounted, reserve a small amount of unused space for | |
1237 | * privileged transactions. This is needed so that transaction | |
1238 | * space required for critical operations can dip into this pool | |
1239 | * when at ENOSPC. This is needed for operations like create with | |
1240 | * attr, unwritten extent conversion at ENOSPC, etc. Data allocations | |
1241 | * are not allowed to use this reserved space. | |
1242 | * | |
1243 | * We default to 5% or 1024 fsbs of space reserved, whichever is smaller. | |
1244 | * This may drive us straight to ENOSPC on mount, but that implies | |
714082bc | 1245 | * we were already there on the last unmount. Warn if this occurs. |
84e1e99f | 1246 | */ |
39726be2 CH |
1247 | resblks = mp->m_sb.sb_dblocks; |
1248 | do_div(resblks, 20); | |
1249 | resblks = min_t(__uint64_t, resblks, 1024); | |
714082bc DC |
1250 | error = xfs_reserve_blocks(mp, &resblks, NULL); |
1251 | if (error) | |
1252 | cmn_err(CE_WARN, "XFS: Unable to allocate reserve blocks. " | |
1253 | "Continuing without a reserve pool."); | |
84e1e99f | 1254 | |
1da177e4 LT |
1255 | return 0; |
1256 | ||
b93b6e43 CH |
1257 | out_rtunmount: |
1258 | xfs_rtunmount_inodes(mp); | |
f9057e3d | 1259 | out_rele_rip: |
43355099 | 1260 | IRELE(rip); |
f9057e3d | 1261 | out_log_dealloc: |
21b699c8 | 1262 | xfs_log_unmount(mp); |
f9057e3d | 1263 | out_free_perag: |
ff4f038c | 1264 | xfs_free_perag(mp); |
f9057e3d | 1265 | out_remove_uuid: |
27174203 | 1266 | xfs_uuid_unmount(mp); |
f9057e3d | 1267 | out: |
1da177e4 LT |
1268 | return error; |
1269 | } | |
1270 | ||
1271 | /* | |
1da177e4 LT |
1272 | * This flushes out the inodes,dquots and the superblock, unmounts the |
1273 | * log and makes sure that incore structures are freed. | |
1274 | */ | |
41b5c2e7 CH |
1275 | void |
1276 | xfs_unmountfs( | |
1277 | struct xfs_mount *mp) | |
1da177e4 | 1278 | { |
41b5c2e7 CH |
1279 | __uint64_t resblks; |
1280 | int error; | |
1da177e4 | 1281 | |
f95099ba CH |
1282 | /* |
1283 | * Release dquot that rootinode, rbmino and rsumino might be holding, | |
1284 | * and release the quota inodes. | |
1285 | */ | |
1286 | XFS_QM_UNMOUNT(mp); | |
1287 | ||
b93b6e43 | 1288 | xfs_rtunmount_inodes(mp); |
77508ec8 CH |
1289 | IRELE(mp->m_rootip); |
1290 | ||
641c56fb DC |
1291 | /* |
1292 | * We can potentially deadlock here if we have an inode cluster | |
9da096fd | 1293 | * that has been freed has its buffer still pinned in memory because |
641c56fb DC |
1294 | * the transaction is still sitting in a iclog. The stale inodes |
1295 | * on that buffer will have their flush locks held until the | |
1296 | * transaction hits the disk and the callbacks run. the inode | |
1297 | * flush takes the flush lock unconditionally and with nothing to | |
1298 | * push out the iclog we will never get that unlocked. hence we | |
1299 | * need to force the log first. | |
1300 | */ | |
1301 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
1dc3318a | 1302 | xfs_reclaim_inodes(mp, 0, XFS_IFLUSH_ASYNC); |
1da177e4 | 1303 | |
ee2a4f7c | 1304 | XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING); |
1da177e4 | 1305 | |
a357a121 LM |
1306 | if (mp->m_quotainfo) |
1307 | XFS_QM_DONE(mp); | |
1308 | ||
1da177e4 LT |
1309 | /* |
1310 | * Flush out the log synchronously so that we know for sure | |
1311 | * that nothing is pinned. This is important because bflush() | |
1312 | * will skip pinned buffers. | |
1313 | */ | |
1314 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
1315 | ||
1316 | xfs_binval(mp->m_ddev_targp); | |
1317 | if (mp->m_rtdev_targp) { | |
1318 | xfs_binval(mp->m_rtdev_targp); | |
1319 | } | |
1320 | ||
84e1e99f DC |
1321 | /* |
1322 | * Unreserve any blocks we have so that when we unmount we don't account | |
1323 | * the reserved free space as used. This is really only necessary for | |
1324 | * lazy superblock counting because it trusts the incore superblock | |
9da096fd | 1325 | * counters to be absolutely correct on clean unmount. |
84e1e99f DC |
1326 | * |
1327 | * We don't bother correcting this elsewhere for lazy superblock | |
1328 | * counting because on mount of an unclean filesystem we reconstruct the | |
1329 | * correct counter value and this is irrelevant. | |
1330 | * | |
1331 | * For non-lazy counter filesystems, this doesn't matter at all because | |
1332 | * we only every apply deltas to the superblock and hence the incore | |
1333 | * value does not matter.... | |
1334 | */ | |
1335 | resblks = 0; | |
714082bc DC |
1336 | error = xfs_reserve_blocks(mp, &resblks, NULL); |
1337 | if (error) | |
1338 | cmn_err(CE_WARN, "XFS: Unable to free reserved block pool. " | |
1339 | "Freespace may not be correct on next mount."); | |
1340 | ||
e5720eec DC |
1341 | error = xfs_log_sbcount(mp, 1); |
1342 | if (error) | |
1343 | cmn_err(CE_WARN, "XFS: Unable to update superblock counters. " | |
1344 | "Freespace may not be correct on next mount."); | |
1da177e4 | 1345 | xfs_unmountfs_writesb(mp); |
1da177e4 | 1346 | xfs_unmountfs_wait(mp); /* wait for async bufs */ |
21b699c8 CH |
1347 | xfs_log_unmount_write(mp); |
1348 | xfs_log_unmount(mp); | |
27174203 | 1349 | xfs_uuid_unmount(mp); |
1da177e4 | 1350 | |
1550d0b0 | 1351 | #if defined(DEBUG) |
0ce4cfd4 | 1352 | xfs_errortag_clearall(mp, 0); |
1da177e4 | 1353 | #endif |
ff4f038c | 1354 | xfs_free_perag(mp); |
1da177e4 LT |
1355 | } |
1356 | ||
ba0f32d4 | 1357 | STATIC void |
1da177e4 LT |
1358 | xfs_unmountfs_wait(xfs_mount_t *mp) |
1359 | { | |
1360 | if (mp->m_logdev_targp != mp->m_ddev_targp) | |
1361 | xfs_wait_buftarg(mp->m_logdev_targp); | |
1362 | if (mp->m_rtdev_targp) | |
1363 | xfs_wait_buftarg(mp->m_rtdev_targp); | |
1364 | xfs_wait_buftarg(mp->m_ddev_targp); | |
1365 | } | |
1366 | ||
92821e2b DC |
1367 | int |
1368 | xfs_fs_writable(xfs_mount_t *mp) | |
1369 | { | |
b267ce99 | 1370 | return !(xfs_test_for_freeze(mp) || XFS_FORCED_SHUTDOWN(mp) || |
bd186aa9 | 1371 | (mp->m_flags & XFS_MOUNT_RDONLY)); |
92821e2b DC |
1372 | } |
1373 | ||
1374 | /* | |
1375 | * xfs_log_sbcount | |
1376 | * | |
1377 | * Called either periodically to keep the on disk superblock values | |
1378 | * roughly up to date or from unmount to make sure the values are | |
1379 | * correct on a clean unmount. | |
1380 | * | |
1381 | * Note this code can be called during the process of freezing, so | |
1382 | * we may need to use the transaction allocator which does not not | |
1383 | * block when the transaction subsystem is in its frozen state. | |
1384 | */ | |
1385 | int | |
1386 | xfs_log_sbcount( | |
1387 | xfs_mount_t *mp, | |
1388 | uint sync) | |
1389 | { | |
1390 | xfs_trans_t *tp; | |
1391 | int error; | |
1392 | ||
1393 | if (!xfs_fs_writable(mp)) | |
1394 | return 0; | |
1395 | ||
d4d90b57 | 1396 | xfs_icsb_sync_counters(mp, 0); |
92821e2b DC |
1397 | |
1398 | /* | |
1399 | * we don't need to do this if we are updating the superblock | |
1400 | * counters on every modification. | |
1401 | */ | |
1402 | if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) | |
1403 | return 0; | |
1404 | ||
1405 | tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT); | |
1406 | error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1407 | XFS_DEFAULT_LOG_COUNT); | |
1408 | if (error) { | |
1409 | xfs_trans_cancel(tp, 0); | |
1410 | return error; | |
1411 | } | |
1412 | ||
1413 | xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS); | |
1414 | if (sync) | |
1415 | xfs_trans_set_sync(tp); | |
e5720eec DC |
1416 | error = xfs_trans_commit(tp, 0); |
1417 | return error; | |
92821e2b DC |
1418 | } |
1419 | ||
1da177e4 LT |
1420 | int |
1421 | xfs_unmountfs_writesb(xfs_mount_t *mp) | |
1422 | { | |
1423 | xfs_buf_t *sbp; | |
1da177e4 LT |
1424 | int error = 0; |
1425 | ||
1426 | /* | |
1427 | * skip superblock write if fs is read-only, or | |
1428 | * if we are doing a forced umount. | |
1429 | */ | |
bd186aa9 | 1430 | if (!((mp->m_flags & XFS_MOUNT_RDONLY) || |
1da177e4 | 1431 | XFS_FORCED_SHUTDOWN(mp))) { |
8d280b98 | 1432 | |
92821e2b | 1433 | sbp = xfs_getsb(mp, 0); |
8d280b98 | 1434 | |
1da177e4 LT |
1435 | XFS_BUF_UNDONE(sbp); |
1436 | XFS_BUF_UNREAD(sbp); | |
1437 | XFS_BUF_UNDELAYWRITE(sbp); | |
1438 | XFS_BUF_WRITE(sbp); | |
1439 | XFS_BUF_UNASYNC(sbp); | |
1440 | ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp); | |
1441 | xfsbdstrat(mp, sbp); | |
1da177e4 LT |
1442 | error = xfs_iowait(sbp); |
1443 | if (error) | |
1444 | xfs_ioerror_alert("xfs_unmountfs_writesb", | |
1445 | mp, sbp, XFS_BUF_ADDR(sbp)); | |
92821e2b | 1446 | xfs_buf_relse(sbp); |
1da177e4 | 1447 | } |
014c2544 | 1448 | return error; |
1da177e4 LT |
1449 | } |
1450 | ||
1451 | /* | |
1452 | * xfs_mod_sb() can be used to copy arbitrary changes to the | |
1453 | * in-core superblock into the superblock buffer to be logged. | |
1454 | * It does not provide the higher level of locking that is | |
1455 | * needed to protect the in-core superblock from concurrent | |
1456 | * access. | |
1457 | */ | |
1458 | void | |
1459 | xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) | |
1460 | { | |
1461 | xfs_buf_t *bp; | |
1462 | int first; | |
1463 | int last; | |
1464 | xfs_mount_t *mp; | |
1da177e4 LT |
1465 | xfs_sb_field_t f; |
1466 | ||
1467 | ASSERT(fields); | |
1468 | if (!fields) | |
1469 | return; | |
1470 | mp = tp->t_mountp; | |
1471 | bp = xfs_trans_getsb(tp, mp, 0); | |
1da177e4 LT |
1472 | first = sizeof(xfs_sb_t); |
1473 | last = 0; | |
1474 | ||
1475 | /* translate/copy */ | |
1476 | ||
2bdf7cd0 | 1477 | xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields); |
1da177e4 LT |
1478 | |
1479 | /* find modified range */ | |
1480 | ||
1481 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
1482 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1483 | first = xfs_sb_info[f].offset; | |
1484 | ||
1485 | f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); | |
1486 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1487 | last = xfs_sb_info[f + 1].offset - 1; | |
1488 | ||
1489 | xfs_trans_log_buf(tp, bp, first, last); | |
1490 | } | |
d210a28c | 1491 | |
d210a28c | 1492 | |
1da177e4 LT |
1493 | /* |
1494 | * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply | |
1495 | * a delta to a specified field in the in-core superblock. Simply | |
1496 | * switch on the field indicated and apply the delta to that field. | |
1497 | * Fields are not allowed to dip below zero, so if the delta would | |
1498 | * do this do not apply it and return EINVAL. | |
1499 | * | |
3685c2a1 | 1500 | * The m_sb_lock must be held when this routine is called. |
1da177e4 | 1501 | */ |
8d280b98 | 1502 | int |
20f4ebf2 DC |
1503 | xfs_mod_incore_sb_unlocked( |
1504 | xfs_mount_t *mp, | |
1505 | xfs_sb_field_t field, | |
1506 | int64_t delta, | |
1507 | int rsvd) | |
1da177e4 LT |
1508 | { |
1509 | int scounter; /* short counter for 32 bit fields */ | |
1510 | long long lcounter; /* long counter for 64 bit fields */ | |
1511 | long long res_used, rem; | |
1512 | ||
1513 | /* | |
1514 | * With the in-core superblock spin lock held, switch | |
1515 | * on the indicated field. Apply the delta to the | |
1516 | * proper field. If the fields value would dip below | |
1517 | * 0, then do not apply the delta and return EINVAL. | |
1518 | */ | |
1519 | switch (field) { | |
1520 | case XFS_SBS_ICOUNT: | |
1521 | lcounter = (long long)mp->m_sb.sb_icount; | |
1522 | lcounter += delta; | |
1523 | if (lcounter < 0) { | |
1524 | ASSERT(0); | |
014c2544 | 1525 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1526 | } |
1527 | mp->m_sb.sb_icount = lcounter; | |
014c2544 | 1528 | return 0; |
1da177e4 LT |
1529 | case XFS_SBS_IFREE: |
1530 | lcounter = (long long)mp->m_sb.sb_ifree; | |
1531 | lcounter += delta; | |
1532 | if (lcounter < 0) { | |
1533 | ASSERT(0); | |
014c2544 | 1534 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1535 | } |
1536 | mp->m_sb.sb_ifree = lcounter; | |
014c2544 | 1537 | return 0; |
1da177e4 | 1538 | case XFS_SBS_FDBLOCKS: |
4be536de DC |
1539 | lcounter = (long long) |
1540 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); | |
1da177e4 LT |
1541 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
1542 | ||
1543 | if (delta > 0) { /* Putting blocks back */ | |
1544 | if (res_used > delta) { | |
1545 | mp->m_resblks_avail += delta; | |
1546 | } else { | |
1547 | rem = delta - res_used; | |
1548 | mp->m_resblks_avail = mp->m_resblks; | |
1549 | lcounter += rem; | |
1550 | } | |
1551 | } else { /* Taking blocks away */ | |
1552 | ||
1553 | lcounter += delta; | |
1554 | ||
1555 | /* | |
1556 | * If were out of blocks, use any available reserved blocks if | |
1557 | * were allowed to. | |
1558 | */ | |
1559 | ||
1560 | if (lcounter < 0) { | |
1561 | if (rsvd) { | |
1562 | lcounter = (long long)mp->m_resblks_avail + delta; | |
1563 | if (lcounter < 0) { | |
014c2544 | 1564 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1565 | } |
1566 | mp->m_resblks_avail = lcounter; | |
014c2544 | 1567 | return 0; |
1da177e4 | 1568 | } else { /* not reserved */ |
014c2544 | 1569 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1570 | } |
1571 | } | |
1572 | } | |
1573 | ||
4be536de | 1574 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
014c2544 | 1575 | return 0; |
1da177e4 LT |
1576 | case XFS_SBS_FREXTENTS: |
1577 | lcounter = (long long)mp->m_sb.sb_frextents; | |
1578 | lcounter += delta; | |
1579 | if (lcounter < 0) { | |
014c2544 | 1580 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1581 | } |
1582 | mp->m_sb.sb_frextents = lcounter; | |
014c2544 | 1583 | return 0; |
1da177e4 LT |
1584 | case XFS_SBS_DBLOCKS: |
1585 | lcounter = (long long)mp->m_sb.sb_dblocks; | |
1586 | lcounter += delta; | |
1587 | if (lcounter < 0) { | |
1588 | ASSERT(0); | |
014c2544 | 1589 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1590 | } |
1591 | mp->m_sb.sb_dblocks = lcounter; | |
014c2544 | 1592 | return 0; |
1da177e4 LT |
1593 | case XFS_SBS_AGCOUNT: |
1594 | scounter = mp->m_sb.sb_agcount; | |
1595 | scounter += delta; | |
1596 | if (scounter < 0) { | |
1597 | ASSERT(0); | |
014c2544 | 1598 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1599 | } |
1600 | mp->m_sb.sb_agcount = scounter; | |
014c2544 | 1601 | return 0; |
1da177e4 LT |
1602 | case XFS_SBS_IMAX_PCT: |
1603 | scounter = mp->m_sb.sb_imax_pct; | |
1604 | scounter += delta; | |
1605 | if (scounter < 0) { | |
1606 | ASSERT(0); | |
014c2544 | 1607 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1608 | } |
1609 | mp->m_sb.sb_imax_pct = scounter; | |
014c2544 | 1610 | return 0; |
1da177e4 LT |
1611 | case XFS_SBS_REXTSIZE: |
1612 | scounter = mp->m_sb.sb_rextsize; | |
1613 | scounter += delta; | |
1614 | if (scounter < 0) { | |
1615 | ASSERT(0); | |
014c2544 | 1616 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1617 | } |
1618 | mp->m_sb.sb_rextsize = scounter; | |
014c2544 | 1619 | return 0; |
1da177e4 LT |
1620 | case XFS_SBS_RBMBLOCKS: |
1621 | scounter = mp->m_sb.sb_rbmblocks; | |
1622 | scounter += delta; | |
1623 | if (scounter < 0) { | |
1624 | ASSERT(0); | |
014c2544 | 1625 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1626 | } |
1627 | mp->m_sb.sb_rbmblocks = scounter; | |
014c2544 | 1628 | return 0; |
1da177e4 LT |
1629 | case XFS_SBS_RBLOCKS: |
1630 | lcounter = (long long)mp->m_sb.sb_rblocks; | |
1631 | lcounter += delta; | |
1632 | if (lcounter < 0) { | |
1633 | ASSERT(0); | |
014c2544 | 1634 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1635 | } |
1636 | mp->m_sb.sb_rblocks = lcounter; | |
014c2544 | 1637 | return 0; |
1da177e4 LT |
1638 | case XFS_SBS_REXTENTS: |
1639 | lcounter = (long long)mp->m_sb.sb_rextents; | |
1640 | lcounter += delta; | |
1641 | if (lcounter < 0) { | |
1642 | ASSERT(0); | |
014c2544 | 1643 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1644 | } |
1645 | mp->m_sb.sb_rextents = lcounter; | |
014c2544 | 1646 | return 0; |
1da177e4 LT |
1647 | case XFS_SBS_REXTSLOG: |
1648 | scounter = mp->m_sb.sb_rextslog; | |
1649 | scounter += delta; | |
1650 | if (scounter < 0) { | |
1651 | ASSERT(0); | |
014c2544 | 1652 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1653 | } |
1654 | mp->m_sb.sb_rextslog = scounter; | |
014c2544 | 1655 | return 0; |
1da177e4 LT |
1656 | default: |
1657 | ASSERT(0); | |
014c2544 | 1658 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1659 | } |
1660 | } | |
1661 | ||
1662 | /* | |
1663 | * xfs_mod_incore_sb() is used to change a field in the in-core | |
1664 | * superblock structure by the specified delta. This modification | |
3685c2a1 | 1665 | * is protected by the m_sb_lock. Just use the xfs_mod_incore_sb_unlocked() |
1da177e4 LT |
1666 | * routine to do the work. |
1667 | */ | |
1668 | int | |
20f4ebf2 DC |
1669 | xfs_mod_incore_sb( |
1670 | xfs_mount_t *mp, | |
1671 | xfs_sb_field_t field, | |
1672 | int64_t delta, | |
1673 | int rsvd) | |
1da177e4 | 1674 | { |
1da177e4 LT |
1675 | int status; |
1676 | ||
8d280b98 DC |
1677 | /* check for per-cpu counters */ |
1678 | switch (field) { | |
1679 | #ifdef HAVE_PERCPU_SB | |
1680 | case XFS_SBS_ICOUNT: | |
1681 | case XFS_SBS_IFREE: | |
1682 | case XFS_SBS_FDBLOCKS: | |
1683 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
1684 | status = xfs_icsb_modify_counters(mp, field, | |
1685 | delta, rsvd); | |
1686 | break; | |
1687 | } | |
1688 | /* FALLTHROUGH */ | |
1689 | #endif | |
1690 | default: | |
3685c2a1 | 1691 | spin_lock(&mp->m_sb_lock); |
8d280b98 | 1692 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
3685c2a1 | 1693 | spin_unlock(&mp->m_sb_lock); |
8d280b98 DC |
1694 | break; |
1695 | } | |
1696 | ||
014c2544 | 1697 | return status; |
1da177e4 LT |
1698 | } |
1699 | ||
1700 | /* | |
1701 | * xfs_mod_incore_sb_batch() is used to change more than one field | |
1702 | * in the in-core superblock structure at a time. This modification | |
1703 | * is protected by a lock internal to this module. The fields and | |
1704 | * changes to those fields are specified in the array of xfs_mod_sb | |
1705 | * structures passed in. | |
1706 | * | |
1707 | * Either all of the specified deltas will be applied or none of | |
1708 | * them will. If any modified field dips below 0, then all modifications | |
1709 | * will be backed out and EINVAL will be returned. | |
1710 | */ | |
1711 | int | |
1712 | xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd) | |
1713 | { | |
1da177e4 LT |
1714 | int status=0; |
1715 | xfs_mod_sb_t *msbp; | |
1716 | ||
1717 | /* | |
1718 | * Loop through the array of mod structures and apply each | |
1719 | * individually. If any fail, then back out all those | |
1720 | * which have already been applied. Do all of this within | |
3685c2a1 | 1721 | * the scope of the m_sb_lock so that all of the changes will |
1da177e4 LT |
1722 | * be atomic. |
1723 | */ | |
3685c2a1 | 1724 | spin_lock(&mp->m_sb_lock); |
1da177e4 LT |
1725 | msbp = &msb[0]; |
1726 | for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) { | |
1727 | /* | |
1728 | * Apply the delta at index n. If it fails, break | |
1729 | * from the loop so we'll fall into the undo loop | |
1730 | * below. | |
1731 | */ | |
8d280b98 DC |
1732 | switch (msbp->msb_field) { |
1733 | #ifdef HAVE_PERCPU_SB | |
1734 | case XFS_SBS_ICOUNT: | |
1735 | case XFS_SBS_IFREE: | |
1736 | case XFS_SBS_FDBLOCKS: | |
1737 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
3685c2a1 | 1738 | spin_unlock(&mp->m_sb_lock); |
20b64285 | 1739 | status = xfs_icsb_modify_counters(mp, |
8d280b98 DC |
1740 | msbp->msb_field, |
1741 | msbp->msb_delta, rsvd); | |
3685c2a1 | 1742 | spin_lock(&mp->m_sb_lock); |
8d280b98 DC |
1743 | break; |
1744 | } | |
1745 | /* FALLTHROUGH */ | |
1746 | #endif | |
1747 | default: | |
1748 | status = xfs_mod_incore_sb_unlocked(mp, | |
1749 | msbp->msb_field, | |
1750 | msbp->msb_delta, rsvd); | |
1751 | break; | |
1752 | } | |
1753 | ||
1da177e4 LT |
1754 | if (status != 0) { |
1755 | break; | |
1756 | } | |
1757 | } | |
1758 | ||
1759 | /* | |
1760 | * If we didn't complete the loop above, then back out | |
1761 | * any changes made to the superblock. If you add code | |
1762 | * between the loop above and here, make sure that you | |
1763 | * preserve the value of status. Loop back until | |
1764 | * we step below the beginning of the array. Make sure | |
1765 | * we don't touch anything back there. | |
1766 | */ | |
1767 | if (status != 0) { | |
1768 | msbp--; | |
1769 | while (msbp >= msb) { | |
8d280b98 DC |
1770 | switch (msbp->msb_field) { |
1771 | #ifdef HAVE_PERCPU_SB | |
1772 | case XFS_SBS_ICOUNT: | |
1773 | case XFS_SBS_IFREE: | |
1774 | case XFS_SBS_FDBLOCKS: | |
1775 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
3685c2a1 | 1776 | spin_unlock(&mp->m_sb_lock); |
20b64285 | 1777 | status = xfs_icsb_modify_counters(mp, |
8d280b98 DC |
1778 | msbp->msb_field, |
1779 | -(msbp->msb_delta), | |
1780 | rsvd); | |
3685c2a1 | 1781 | spin_lock(&mp->m_sb_lock); |
8d280b98 DC |
1782 | break; |
1783 | } | |
1784 | /* FALLTHROUGH */ | |
1785 | #endif | |
1786 | default: | |
1787 | status = xfs_mod_incore_sb_unlocked(mp, | |
1788 | msbp->msb_field, | |
1789 | -(msbp->msb_delta), | |
1790 | rsvd); | |
1791 | break; | |
1792 | } | |
1da177e4 LT |
1793 | ASSERT(status == 0); |
1794 | msbp--; | |
1795 | } | |
1796 | } | |
3685c2a1 | 1797 | spin_unlock(&mp->m_sb_lock); |
014c2544 | 1798 | return status; |
1da177e4 LT |
1799 | } |
1800 | ||
1801 | /* | |
1802 | * xfs_getsb() is called to obtain the buffer for the superblock. | |
1803 | * The buffer is returned locked and read in from disk. | |
1804 | * The buffer should be released with a call to xfs_brelse(). | |
1805 | * | |
1806 | * If the flags parameter is BUF_TRYLOCK, then we'll only return | |
1807 | * the superblock buffer if it can be locked without sleeping. | |
1808 | * If it can't then we'll return NULL. | |
1809 | */ | |
1810 | xfs_buf_t * | |
1811 | xfs_getsb( | |
1812 | xfs_mount_t *mp, | |
1813 | int flags) | |
1814 | { | |
1815 | xfs_buf_t *bp; | |
1816 | ||
1817 | ASSERT(mp->m_sb_bp != NULL); | |
1818 | bp = mp->m_sb_bp; | |
1819 | if (flags & XFS_BUF_TRYLOCK) { | |
1820 | if (!XFS_BUF_CPSEMA(bp)) { | |
1821 | return NULL; | |
1822 | } | |
1823 | } else { | |
1824 | XFS_BUF_PSEMA(bp, PRIBIO); | |
1825 | } | |
1826 | XFS_BUF_HOLD(bp); | |
1827 | ASSERT(XFS_BUF_ISDONE(bp)); | |
014c2544 | 1828 | return bp; |
1da177e4 LT |
1829 | } |
1830 | ||
1831 | /* | |
1832 | * Used to free the superblock along various error paths. | |
1833 | */ | |
1834 | void | |
1835 | xfs_freesb( | |
1836 | xfs_mount_t *mp) | |
1837 | { | |
1838 | xfs_buf_t *bp; | |
1839 | ||
1840 | /* | |
1841 | * Use xfs_getsb() so that the buffer will be locked | |
1842 | * when we call xfs_buf_relse(). | |
1843 | */ | |
1844 | bp = xfs_getsb(mp, 0); | |
1845 | XFS_BUF_UNMANAGE(bp); | |
1846 | xfs_buf_relse(bp); | |
1847 | mp->m_sb_bp = NULL; | |
1848 | } | |
1849 | ||
1da177e4 LT |
1850 | /* |
1851 | * Used to log changes to the superblock unit and width fields which could | |
e6957ea4 ES |
1852 | * be altered by the mount options, as well as any potential sb_features2 |
1853 | * fixup. Only the first superblock is updated. | |
1da177e4 | 1854 | */ |
7884bc86 | 1855 | int |
ee1c0908 | 1856 | xfs_mount_log_sb( |
1da177e4 LT |
1857 | xfs_mount_t *mp, |
1858 | __int64_t fields) | |
1859 | { | |
1860 | xfs_trans_t *tp; | |
e5720eec | 1861 | int error; |
1da177e4 | 1862 | |
ee1c0908 | 1863 | ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID | |
4b166de0 DC |
1864 | XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2 | |
1865 | XFS_SB_VERSIONNUM)); | |
1da177e4 LT |
1866 | |
1867 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); | |
e5720eec DC |
1868 | error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, |
1869 | XFS_DEFAULT_LOG_COUNT); | |
1870 | if (error) { | |
1da177e4 | 1871 | xfs_trans_cancel(tp, 0); |
e5720eec | 1872 | return error; |
1da177e4 LT |
1873 | } |
1874 | xfs_mod_sb(tp, fields); | |
e5720eec DC |
1875 | error = xfs_trans_commit(tp, 0); |
1876 | return error; | |
1da177e4 | 1877 | } |
8d280b98 DC |
1878 | |
1879 | ||
1880 | #ifdef HAVE_PERCPU_SB | |
1881 | /* | |
1882 | * Per-cpu incore superblock counters | |
1883 | * | |
1884 | * Simple concept, difficult implementation | |
1885 | * | |
1886 | * Basically, replace the incore superblock counters with a distributed per cpu | |
1887 | * counter for contended fields (e.g. free block count). | |
1888 | * | |
1889 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and | |
1890 | * hence needs to be accurately read when we are running low on space. Hence | |
1891 | * there is a method to enable and disable the per-cpu counters based on how | |
1892 | * much "stuff" is available in them. | |
1893 | * | |
1894 | * Basically, a counter is enabled if there is enough free resource to justify | |
1895 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local | |
1896 | * ENOSPC), then we disable the counters to synchronise all callers and | |
1897 | * re-distribute the available resources. | |
1898 | * | |
1899 | * If, once we redistributed the available resources, we still get a failure, | |
1900 | * we disable the per-cpu counter and go through the slow path. | |
1901 | * | |
1902 | * The slow path is the current xfs_mod_incore_sb() function. This means that | |
9da096fd | 1903 | * when we disable a per-cpu counter, we need to drain its resources back to |
8d280b98 DC |
1904 | * the global superblock. We do this after disabling the counter to prevent |
1905 | * more threads from queueing up on the counter. | |
1906 | * | |
1907 | * Essentially, this means that we still need a lock in the fast path to enable | |
1908 | * synchronisation between the global counters and the per-cpu counters. This | |
1909 | * is not a problem because the lock will be local to a CPU almost all the time | |
1910 | * and have little contention except when we get to ENOSPC conditions. | |
1911 | * | |
1912 | * Basically, this lock becomes a barrier that enables us to lock out the fast | |
1913 | * path while we do things like enabling and disabling counters and | |
1914 | * synchronising the counters. | |
1915 | * | |
1916 | * Locking rules: | |
1917 | * | |
3685c2a1 | 1918 | * 1. m_sb_lock before picking up per-cpu locks |
8d280b98 | 1919 | * 2. per-cpu locks always picked up via for_each_online_cpu() order |
3685c2a1 | 1920 | * 3. accurate counter sync requires m_sb_lock + per cpu locks |
8d280b98 | 1921 | * 4. modifying per-cpu counters requires holding per-cpu lock |
3685c2a1 ES |
1922 | * 5. modifying global counters requires holding m_sb_lock |
1923 | * 6. enabling or disabling a counter requires holding the m_sb_lock | |
8d280b98 DC |
1924 | * and _none_ of the per-cpu locks. |
1925 | * | |
1926 | * Disabled counters are only ever re-enabled by a balance operation | |
1927 | * that results in more free resources per CPU than a given threshold. | |
1928 | * To ensure counters don't remain disabled, they are rebalanced when | |
1929 | * the global resource goes above a higher threshold (i.e. some hysteresis | |
1930 | * is present to prevent thrashing). | |
e8234a68 DC |
1931 | */ |
1932 | ||
5a67e4c5 | 1933 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1934 | /* |
1935 | * hot-plug CPU notifier support. | |
8d280b98 | 1936 | * |
5a67e4c5 CS |
1937 | * We need a notifier per filesystem as we need to be able to identify |
1938 | * the filesystem to balance the counters out. This is achieved by | |
1939 | * having a notifier block embedded in the xfs_mount_t and doing pointer | |
1940 | * magic to get the mount pointer from the notifier block address. | |
8d280b98 | 1941 | */ |
e8234a68 DC |
1942 | STATIC int |
1943 | xfs_icsb_cpu_notify( | |
1944 | struct notifier_block *nfb, | |
1945 | unsigned long action, | |
1946 | void *hcpu) | |
1947 | { | |
1948 | xfs_icsb_cnts_t *cntp; | |
1949 | xfs_mount_t *mp; | |
e8234a68 DC |
1950 | |
1951 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); | |
1952 | cntp = (xfs_icsb_cnts_t *) | |
1953 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); | |
1954 | switch (action) { | |
1955 | case CPU_UP_PREPARE: | |
8bb78442 | 1956 | case CPU_UP_PREPARE_FROZEN: |
e8234a68 DC |
1957 | /* Easy Case - initialize the area and locks, and |
1958 | * then rebalance when online does everything else for us. */ | |
01e1b69c | 1959 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 DC |
1960 | break; |
1961 | case CPU_ONLINE: | |
8bb78442 | 1962 | case CPU_ONLINE_FROZEN: |
03135cf7 | 1963 | xfs_icsb_lock(mp); |
45af6c6d CH |
1964 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
1965 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); | |
1966 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); | |
03135cf7 | 1967 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1968 | break; |
1969 | case CPU_DEAD: | |
8bb78442 | 1970 | case CPU_DEAD_FROZEN: |
e8234a68 DC |
1971 | /* Disable all the counters, then fold the dead cpu's |
1972 | * count into the total on the global superblock and | |
1973 | * re-enable the counters. */ | |
03135cf7 | 1974 | xfs_icsb_lock(mp); |
3685c2a1 | 1975 | spin_lock(&mp->m_sb_lock); |
e8234a68 DC |
1976 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); |
1977 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); | |
1978 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); | |
1979 | ||
1980 | mp->m_sb.sb_icount += cntp->icsb_icount; | |
1981 | mp->m_sb.sb_ifree += cntp->icsb_ifree; | |
1982 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; | |
1983 | ||
01e1b69c | 1984 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 | 1985 | |
45af6c6d CH |
1986 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_ICOUNT, 0); |
1987 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_IFREE, 0); | |
1988 | xfs_icsb_balance_counter_locked(mp, XFS_SBS_FDBLOCKS, 0); | |
3685c2a1 | 1989 | spin_unlock(&mp->m_sb_lock); |
03135cf7 | 1990 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1991 | break; |
1992 | } | |
1993 | ||
1994 | return NOTIFY_OK; | |
1995 | } | |
5a67e4c5 | 1996 | #endif /* CONFIG_HOTPLUG_CPU */ |
e8234a68 | 1997 | |
8d280b98 DC |
1998 | int |
1999 | xfs_icsb_init_counters( | |
2000 | xfs_mount_t *mp) | |
2001 | { | |
2002 | xfs_icsb_cnts_t *cntp; | |
2003 | int i; | |
2004 | ||
2005 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); | |
2006 | if (mp->m_sb_cnts == NULL) | |
2007 | return -ENOMEM; | |
2008 | ||
5a67e4c5 | 2009 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
2010 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; |
2011 | mp->m_icsb_notifier.priority = 0; | |
5a67e4c5 CS |
2012 | register_hotcpu_notifier(&mp->m_icsb_notifier); |
2013 | #endif /* CONFIG_HOTPLUG_CPU */ | |
e8234a68 | 2014 | |
8d280b98 DC |
2015 | for_each_online_cpu(i) { |
2016 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2017 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
8d280b98 | 2018 | } |
20b64285 DC |
2019 | |
2020 | mutex_init(&mp->m_icsb_mutex); | |
2021 | ||
8d280b98 DC |
2022 | /* |
2023 | * start with all counters disabled so that the | |
2024 | * initial balance kicks us off correctly | |
2025 | */ | |
2026 | mp->m_icsb_counters = -1; | |
2027 | return 0; | |
2028 | } | |
2029 | ||
5478eead LM |
2030 | void |
2031 | xfs_icsb_reinit_counters( | |
2032 | xfs_mount_t *mp) | |
2033 | { | |
2034 | xfs_icsb_lock(mp); | |
2035 | /* | |
2036 | * start with all counters disabled so that the | |
2037 | * initial balance kicks us off correctly | |
2038 | */ | |
2039 | mp->m_icsb_counters = -1; | |
45af6c6d CH |
2040 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); |
2041 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); | |
2042 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); | |
5478eead LM |
2043 | xfs_icsb_unlock(mp); |
2044 | } | |
2045 | ||
c962fb79 | 2046 | void |
8d280b98 DC |
2047 | xfs_icsb_destroy_counters( |
2048 | xfs_mount_t *mp) | |
2049 | { | |
e8234a68 | 2050 | if (mp->m_sb_cnts) { |
5a67e4c5 | 2051 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
8d280b98 | 2052 | free_percpu(mp->m_sb_cnts); |
e8234a68 | 2053 | } |
03135cf7 | 2054 | mutex_destroy(&mp->m_icsb_mutex); |
8d280b98 DC |
2055 | } |
2056 | ||
7989cb8e | 2057 | STATIC_INLINE void |
01e1b69c DC |
2058 | xfs_icsb_lock_cntr( |
2059 | xfs_icsb_cnts_t *icsbp) | |
2060 | { | |
2061 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { | |
2062 | ndelay(1000); | |
2063 | } | |
2064 | } | |
2065 | ||
7989cb8e | 2066 | STATIC_INLINE void |
01e1b69c DC |
2067 | xfs_icsb_unlock_cntr( |
2068 | xfs_icsb_cnts_t *icsbp) | |
2069 | { | |
2070 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); | |
2071 | } | |
2072 | ||
8d280b98 | 2073 | |
7989cb8e | 2074 | STATIC_INLINE void |
8d280b98 DC |
2075 | xfs_icsb_lock_all_counters( |
2076 | xfs_mount_t *mp) | |
2077 | { | |
2078 | xfs_icsb_cnts_t *cntp; | |
2079 | int i; | |
2080 | ||
2081 | for_each_online_cpu(i) { | |
2082 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2083 | xfs_icsb_lock_cntr(cntp); |
8d280b98 DC |
2084 | } |
2085 | } | |
2086 | ||
7989cb8e | 2087 | STATIC_INLINE void |
8d280b98 DC |
2088 | xfs_icsb_unlock_all_counters( |
2089 | xfs_mount_t *mp) | |
2090 | { | |
2091 | xfs_icsb_cnts_t *cntp; | |
2092 | int i; | |
2093 | ||
2094 | for_each_online_cpu(i) { | |
2095 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2096 | xfs_icsb_unlock_cntr(cntp); |
8d280b98 DC |
2097 | } |
2098 | } | |
2099 | ||
2100 | STATIC void | |
2101 | xfs_icsb_count( | |
2102 | xfs_mount_t *mp, | |
2103 | xfs_icsb_cnts_t *cnt, | |
2104 | int flags) | |
2105 | { | |
2106 | xfs_icsb_cnts_t *cntp; | |
2107 | int i; | |
2108 | ||
2109 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); | |
2110 | ||
2111 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2112 | xfs_icsb_lock_all_counters(mp); | |
2113 | ||
2114 | for_each_online_cpu(i) { | |
2115 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
2116 | cnt->icsb_icount += cntp->icsb_icount; | |
2117 | cnt->icsb_ifree += cntp->icsb_ifree; | |
2118 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; | |
2119 | } | |
2120 | ||
2121 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2122 | xfs_icsb_unlock_all_counters(mp); | |
2123 | } | |
2124 | ||
2125 | STATIC int | |
2126 | xfs_icsb_counter_disabled( | |
2127 | xfs_mount_t *mp, | |
2128 | xfs_sb_field_t field) | |
2129 | { | |
2130 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2131 | return test_bit(field, &mp->m_icsb_counters); | |
2132 | } | |
2133 | ||
36fbe6e6 | 2134 | STATIC void |
8d280b98 DC |
2135 | xfs_icsb_disable_counter( |
2136 | xfs_mount_t *mp, | |
2137 | xfs_sb_field_t field) | |
2138 | { | |
2139 | xfs_icsb_cnts_t cnt; | |
2140 | ||
2141 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2142 | ||
20b64285 DC |
2143 | /* |
2144 | * If we are already disabled, then there is nothing to do | |
2145 | * here. We check before locking all the counters to avoid | |
2146 | * the expensive lock operation when being called in the | |
2147 | * slow path and the counter is already disabled. This is | |
2148 | * safe because the only time we set or clear this state is under | |
2149 | * the m_icsb_mutex. | |
2150 | */ | |
2151 | if (xfs_icsb_counter_disabled(mp, field)) | |
36fbe6e6 | 2152 | return; |
20b64285 | 2153 | |
8d280b98 DC |
2154 | xfs_icsb_lock_all_counters(mp); |
2155 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { | |
2156 | /* drain back to superblock */ | |
2157 | ||
ce46193b | 2158 | xfs_icsb_count(mp, &cnt, XFS_ICSB_LAZY_COUNT); |
8d280b98 DC |
2159 | switch(field) { |
2160 | case XFS_SBS_ICOUNT: | |
2161 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2162 | break; | |
2163 | case XFS_SBS_IFREE: | |
2164 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2165 | break; | |
2166 | case XFS_SBS_FDBLOCKS: | |
2167 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2168 | break; | |
2169 | default: | |
2170 | BUG(); | |
2171 | } | |
2172 | } | |
2173 | ||
2174 | xfs_icsb_unlock_all_counters(mp); | |
8d280b98 DC |
2175 | } |
2176 | ||
2177 | STATIC void | |
2178 | xfs_icsb_enable_counter( | |
2179 | xfs_mount_t *mp, | |
2180 | xfs_sb_field_t field, | |
2181 | uint64_t count, | |
2182 | uint64_t resid) | |
2183 | { | |
2184 | xfs_icsb_cnts_t *cntp; | |
2185 | int i; | |
2186 | ||
2187 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2188 | ||
2189 | xfs_icsb_lock_all_counters(mp); | |
2190 | for_each_online_cpu(i) { | |
2191 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); | |
2192 | switch (field) { | |
2193 | case XFS_SBS_ICOUNT: | |
2194 | cntp->icsb_icount = count + resid; | |
2195 | break; | |
2196 | case XFS_SBS_IFREE: | |
2197 | cntp->icsb_ifree = count + resid; | |
2198 | break; | |
2199 | case XFS_SBS_FDBLOCKS: | |
2200 | cntp->icsb_fdblocks = count + resid; | |
2201 | break; | |
2202 | default: | |
2203 | BUG(); | |
2204 | break; | |
2205 | } | |
2206 | resid = 0; | |
2207 | } | |
2208 | clear_bit(field, &mp->m_icsb_counters); | |
2209 | xfs_icsb_unlock_all_counters(mp); | |
2210 | } | |
2211 | ||
dbcabad1 | 2212 | void |
d4d90b57 | 2213 | xfs_icsb_sync_counters_locked( |
8d280b98 DC |
2214 | xfs_mount_t *mp, |
2215 | int flags) | |
2216 | { | |
2217 | xfs_icsb_cnts_t cnt; | |
8d280b98 | 2218 | |
8d280b98 DC |
2219 | xfs_icsb_count(mp, &cnt, flags); |
2220 | ||
8d280b98 DC |
2221 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) |
2222 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2223 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) | |
2224 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2225 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) | |
2226 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
8d280b98 DC |
2227 | } |
2228 | ||
2229 | /* | |
2230 | * Accurate update of per-cpu counters to incore superblock | |
2231 | */ | |
d4d90b57 | 2232 | void |
8d280b98 | 2233 | xfs_icsb_sync_counters( |
d4d90b57 CH |
2234 | xfs_mount_t *mp, |
2235 | int flags) | |
8d280b98 | 2236 | { |
d4d90b57 CH |
2237 | spin_lock(&mp->m_sb_lock); |
2238 | xfs_icsb_sync_counters_locked(mp, flags); | |
2239 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 DC |
2240 | } |
2241 | ||
2242 | /* | |
2243 | * Balance and enable/disable counters as necessary. | |
2244 | * | |
20b64285 DC |
2245 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
2246 | * chosen to be the same number as single on disk allocation chunk per CPU, and | |
2247 | * free blocks is something far enough zero that we aren't going thrash when we | |
2248 | * get near ENOSPC. We also need to supply a minimum we require per cpu to | |
2249 | * prevent looping endlessly when xfs_alloc_space asks for more than will | |
2250 | * be distributed to a single CPU but each CPU has enough blocks to be | |
2251 | * reenabled. | |
2252 | * | |
2253 | * Note that we can be called when counters are already disabled. | |
2254 | * xfs_icsb_disable_counter() optimises the counter locking in this case to | |
2255 | * prevent locking every per-cpu counter needlessly. | |
8d280b98 | 2256 | */ |
20b64285 DC |
2257 | |
2258 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 | |
4be536de | 2259 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
20b64285 | 2260 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
8d280b98 | 2261 | STATIC void |
45af6c6d | 2262 | xfs_icsb_balance_counter_locked( |
8d280b98 DC |
2263 | xfs_mount_t *mp, |
2264 | xfs_sb_field_t field, | |
20b64285 | 2265 | int min_per_cpu) |
8d280b98 | 2266 | { |
6fdf8ccc | 2267 | uint64_t count, resid; |
8d280b98 | 2268 | int weight = num_online_cpus(); |
20b64285 | 2269 | uint64_t min = (uint64_t)min_per_cpu; |
8d280b98 | 2270 | |
8d280b98 DC |
2271 | /* disable counter and sync counter */ |
2272 | xfs_icsb_disable_counter(mp, field); | |
2273 | ||
2274 | /* update counters - first CPU gets residual*/ | |
2275 | switch (field) { | |
2276 | case XFS_SBS_ICOUNT: | |
2277 | count = mp->m_sb.sb_icount; | |
2278 | resid = do_div(count, weight); | |
20b64285 | 2279 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
45af6c6d | 2280 | return; |
8d280b98 DC |
2281 | break; |
2282 | case XFS_SBS_IFREE: | |
2283 | count = mp->m_sb.sb_ifree; | |
2284 | resid = do_div(count, weight); | |
20b64285 | 2285 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
45af6c6d | 2286 | return; |
8d280b98 DC |
2287 | break; |
2288 | case XFS_SBS_FDBLOCKS: | |
2289 | count = mp->m_sb.sb_fdblocks; | |
2290 | resid = do_div(count, weight); | |
20b64285 | 2291 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
45af6c6d | 2292 | return; |
8d280b98 DC |
2293 | break; |
2294 | default: | |
2295 | BUG(); | |
6fdf8ccc | 2296 | count = resid = 0; /* quiet, gcc */ |
8d280b98 DC |
2297 | break; |
2298 | } | |
2299 | ||
2300 | xfs_icsb_enable_counter(mp, field, count, resid); | |
45af6c6d CH |
2301 | } |
2302 | ||
2303 | STATIC void | |
2304 | xfs_icsb_balance_counter( | |
2305 | xfs_mount_t *mp, | |
2306 | xfs_sb_field_t fields, | |
2307 | int min_per_cpu) | |
2308 | { | |
2309 | spin_lock(&mp->m_sb_lock); | |
2310 | xfs_icsb_balance_counter_locked(mp, fields, min_per_cpu); | |
2311 | spin_unlock(&mp->m_sb_lock); | |
8d280b98 DC |
2312 | } |
2313 | ||
a8272ce0 | 2314 | STATIC int |
20b64285 | 2315 | xfs_icsb_modify_counters( |
8d280b98 DC |
2316 | xfs_mount_t *mp, |
2317 | xfs_sb_field_t field, | |
20f4ebf2 | 2318 | int64_t delta, |
20b64285 | 2319 | int rsvd) |
8d280b98 DC |
2320 | { |
2321 | xfs_icsb_cnts_t *icsbp; | |
2322 | long long lcounter; /* long counter for 64 bit fields */ | |
007c61c6 | 2323 | int cpu, ret = 0; |
8d280b98 | 2324 | |
20b64285 | 2325 | might_sleep(); |
8d280b98 DC |
2326 | again: |
2327 | cpu = get_cpu(); | |
20b64285 DC |
2328 | icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu); |
2329 | ||
2330 | /* | |
2331 | * if the counter is disabled, go to slow path | |
2332 | */ | |
8d280b98 DC |
2333 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
2334 | goto slow_path; | |
20b64285 DC |
2335 | xfs_icsb_lock_cntr(icsbp); |
2336 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { | |
2337 | xfs_icsb_unlock_cntr(icsbp); | |
2338 | goto slow_path; | |
2339 | } | |
8d280b98 DC |
2340 | |
2341 | switch (field) { | |
2342 | case XFS_SBS_ICOUNT: | |
2343 | lcounter = icsbp->icsb_icount; | |
2344 | lcounter += delta; | |
2345 | if (unlikely(lcounter < 0)) | |
20b64285 | 2346 | goto balance_counter; |
8d280b98 DC |
2347 | icsbp->icsb_icount = lcounter; |
2348 | break; | |
2349 | ||
2350 | case XFS_SBS_IFREE: | |
2351 | lcounter = icsbp->icsb_ifree; | |
2352 | lcounter += delta; | |
2353 | if (unlikely(lcounter < 0)) | |
20b64285 | 2354 | goto balance_counter; |
8d280b98 DC |
2355 | icsbp->icsb_ifree = lcounter; |
2356 | break; | |
2357 | ||
2358 | case XFS_SBS_FDBLOCKS: | |
2359 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); | |
2360 | ||
4be536de | 2361 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2362 | lcounter += delta; |
2363 | if (unlikely(lcounter < 0)) | |
20b64285 | 2364 | goto balance_counter; |
4be536de | 2365 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2366 | break; |
2367 | default: | |
2368 | BUG(); | |
2369 | break; | |
2370 | } | |
01e1b69c | 2371 | xfs_icsb_unlock_cntr(icsbp); |
8d280b98 | 2372 | put_cpu(); |
8d280b98 DC |
2373 | return 0; |
2374 | ||
8d280b98 | 2375 | slow_path: |
8d280b98 DC |
2376 | put_cpu(); |
2377 | ||
20b64285 DC |
2378 | /* |
2379 | * serialise with a mutex so we don't burn lots of cpu on | |
2380 | * the superblock lock. We still need to hold the superblock | |
2381 | * lock, however, when we modify the global structures. | |
2382 | */ | |
03135cf7 | 2383 | xfs_icsb_lock(mp); |
20b64285 DC |
2384 | |
2385 | /* | |
2386 | * Now running atomically. | |
2387 | * | |
2388 | * If the counter is enabled, someone has beaten us to rebalancing. | |
2389 | * Drop the lock and try again in the fast path.... | |
2390 | */ | |
2391 | if (!(xfs_icsb_counter_disabled(mp, field))) { | |
03135cf7 | 2392 | xfs_icsb_unlock(mp); |
8d280b98 | 2393 | goto again; |
8d280b98 DC |
2394 | } |
2395 | ||
20b64285 DC |
2396 | /* |
2397 | * The counter is currently disabled. Because we are | |
2398 | * running atomically here, we know a rebalance cannot | |
2399 | * be in progress. Hence we can go straight to operating | |
2400 | * on the global superblock. We do not call xfs_mod_incore_sb() | |
3685c2a1 | 2401 | * here even though we need to get the m_sb_lock. Doing so |
20b64285 | 2402 | * will cause us to re-enter this function and deadlock. |
3685c2a1 | 2403 | * Hence we get the m_sb_lock ourselves and then call |
20b64285 DC |
2404 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates |
2405 | * directly on the global counters. | |
2406 | */ | |
3685c2a1 | 2407 | spin_lock(&mp->m_sb_lock); |
8d280b98 | 2408 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
3685c2a1 | 2409 | spin_unlock(&mp->m_sb_lock); |
8d280b98 | 2410 | |
20b64285 DC |
2411 | /* |
2412 | * Now that we've modified the global superblock, we | |
2413 | * may be able to re-enable the distributed counters | |
2414 | * (e.g. lots of space just got freed). After that | |
2415 | * we are done. | |
2416 | */ | |
2417 | if (ret != ENOSPC) | |
45af6c6d | 2418 | xfs_icsb_balance_counter(mp, field, 0); |
03135cf7 | 2419 | xfs_icsb_unlock(mp); |
8d280b98 | 2420 | return ret; |
8d280b98 | 2421 | |
20b64285 DC |
2422 | balance_counter: |
2423 | xfs_icsb_unlock_cntr(icsbp); | |
2424 | put_cpu(); | |
8d280b98 | 2425 | |
20b64285 DC |
2426 | /* |
2427 | * We may have multiple threads here if multiple per-cpu | |
2428 | * counters run dry at the same time. This will mean we can | |
2429 | * do more balances than strictly necessary but it is not | |
2430 | * the common slowpath case. | |
2431 | */ | |
03135cf7 | 2432 | xfs_icsb_lock(mp); |
20b64285 DC |
2433 | |
2434 | /* | |
2435 | * running atomically. | |
2436 | * | |
2437 | * This will leave the counter in the correct state for future | |
2438 | * accesses. After the rebalance, we simply try again and our retry | |
2439 | * will either succeed through the fast path or slow path without | |
2440 | * another balance operation being required. | |
2441 | */ | |
45af6c6d | 2442 | xfs_icsb_balance_counter(mp, field, delta); |
03135cf7 | 2443 | xfs_icsb_unlock(mp); |
20b64285 | 2444 | goto again; |
8d280b98 | 2445 | } |
20b64285 | 2446 | |
8d280b98 | 2447 | #endif |