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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_dir2.h" |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
1da177e4 | 30 | #include "xfs_bmap_btree.h" |
a844f451 | 31 | #include "xfs_alloc_btree.h" |
1da177e4 | 32 | #include "xfs_ialloc_btree.h" |
1da177e4 | 33 | #include "xfs_dir2_sf.h" |
a844f451 | 34 | #include "xfs_attr_sf.h" |
1da177e4 LT |
35 | #include "xfs_dinode.h" |
36 | #include "xfs_inode.h" | |
a844f451 NS |
37 | #include "xfs_btree.h" |
38 | #include "xfs_ialloc.h" | |
1da177e4 LT |
39 | #include "xfs_alloc.h" |
40 | #include "xfs_rtalloc.h" | |
41 | #include "xfs_bmap.h" | |
42 | #include "xfs_error.h" | |
1da177e4 LT |
43 | #include "xfs_rw.h" |
44 | #include "xfs_quota.h" | |
45 | #include "xfs_fsops.h" | |
46 | ||
47 | STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t); | |
48 | STATIC int xfs_uuid_mount(xfs_mount_t *); | |
49 | STATIC void xfs_uuid_unmount(xfs_mount_t *mp); | |
ba0f32d4 | 50 | STATIC void xfs_unmountfs_wait(xfs_mount_t *); |
1da177e4 | 51 | |
8d280b98 DC |
52 | |
53 | #ifdef HAVE_PERCPU_SB | |
54 | STATIC void xfs_icsb_destroy_counters(xfs_mount_t *); | |
20f4ebf2 DC |
55 | STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, |
56 | int, int); | |
8d280b98 DC |
57 | STATIC void xfs_icsb_sync_counters(xfs_mount_t *); |
58 | STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t, | |
20f4ebf2 | 59 | int64_t, int); |
e8234a68 | 60 | STATIC int xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t); |
8d280b98 DC |
61 | |
62 | #else | |
63 | ||
64 | #define xfs_icsb_destroy_counters(mp) do { } while (0) | |
20b64285 | 65 | #define xfs_icsb_balance_counter(mp, a, b, c) do { } while (0) |
8d280b98 DC |
66 | #define xfs_icsb_sync_counters(mp) do { } while (0) |
67 | #define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0) | |
8d280b98 DC |
68 | |
69 | #endif | |
70 | ||
1df84c93 | 71 | static const struct { |
8d280b98 DC |
72 | short offset; |
73 | short type; /* 0 = integer | |
74 | * 1 = binary / string (no translation) | |
75 | */ | |
1da177e4 LT |
76 | } xfs_sb_info[] = { |
77 | { offsetof(xfs_sb_t, sb_magicnum), 0 }, | |
78 | { offsetof(xfs_sb_t, sb_blocksize), 0 }, | |
79 | { offsetof(xfs_sb_t, sb_dblocks), 0 }, | |
80 | { offsetof(xfs_sb_t, sb_rblocks), 0 }, | |
81 | { offsetof(xfs_sb_t, sb_rextents), 0 }, | |
82 | { offsetof(xfs_sb_t, sb_uuid), 1 }, | |
83 | { offsetof(xfs_sb_t, sb_logstart), 0 }, | |
84 | { offsetof(xfs_sb_t, sb_rootino), 0 }, | |
85 | { offsetof(xfs_sb_t, sb_rbmino), 0 }, | |
86 | { offsetof(xfs_sb_t, sb_rsumino), 0 }, | |
87 | { offsetof(xfs_sb_t, sb_rextsize), 0 }, | |
88 | { offsetof(xfs_sb_t, sb_agblocks), 0 }, | |
89 | { offsetof(xfs_sb_t, sb_agcount), 0 }, | |
90 | { offsetof(xfs_sb_t, sb_rbmblocks), 0 }, | |
91 | { offsetof(xfs_sb_t, sb_logblocks), 0 }, | |
92 | { offsetof(xfs_sb_t, sb_versionnum), 0 }, | |
93 | { offsetof(xfs_sb_t, sb_sectsize), 0 }, | |
94 | { offsetof(xfs_sb_t, sb_inodesize), 0 }, | |
95 | { offsetof(xfs_sb_t, sb_inopblock), 0 }, | |
96 | { offsetof(xfs_sb_t, sb_fname[0]), 1 }, | |
97 | { offsetof(xfs_sb_t, sb_blocklog), 0 }, | |
98 | { offsetof(xfs_sb_t, sb_sectlog), 0 }, | |
99 | { offsetof(xfs_sb_t, sb_inodelog), 0 }, | |
100 | { offsetof(xfs_sb_t, sb_inopblog), 0 }, | |
101 | { offsetof(xfs_sb_t, sb_agblklog), 0 }, | |
102 | { offsetof(xfs_sb_t, sb_rextslog), 0 }, | |
103 | { offsetof(xfs_sb_t, sb_inprogress), 0 }, | |
104 | { offsetof(xfs_sb_t, sb_imax_pct), 0 }, | |
105 | { offsetof(xfs_sb_t, sb_icount), 0 }, | |
106 | { offsetof(xfs_sb_t, sb_ifree), 0 }, | |
107 | { offsetof(xfs_sb_t, sb_fdblocks), 0 }, | |
108 | { offsetof(xfs_sb_t, sb_frextents), 0 }, | |
109 | { offsetof(xfs_sb_t, sb_uquotino), 0 }, | |
110 | { offsetof(xfs_sb_t, sb_gquotino), 0 }, | |
111 | { offsetof(xfs_sb_t, sb_qflags), 0 }, | |
112 | { offsetof(xfs_sb_t, sb_flags), 0 }, | |
113 | { offsetof(xfs_sb_t, sb_shared_vn), 0 }, | |
114 | { offsetof(xfs_sb_t, sb_inoalignmt), 0 }, | |
115 | { offsetof(xfs_sb_t, sb_unit), 0 }, | |
116 | { offsetof(xfs_sb_t, sb_width), 0 }, | |
117 | { offsetof(xfs_sb_t, sb_dirblklog), 0 }, | |
118 | { offsetof(xfs_sb_t, sb_logsectlog), 0 }, | |
119 | { offsetof(xfs_sb_t, sb_logsectsize),0 }, | |
120 | { offsetof(xfs_sb_t, sb_logsunit), 0 }, | |
121 | { offsetof(xfs_sb_t, sb_features2), 0 }, | |
122 | { sizeof(xfs_sb_t), 0 } | |
123 | }; | |
124 | ||
125 | /* | |
126 | * Return a pointer to an initialized xfs_mount structure. | |
127 | */ | |
128 | xfs_mount_t * | |
129 | xfs_mount_init(void) | |
130 | { | |
131 | xfs_mount_t *mp; | |
132 | ||
8d280b98 DC |
133 | mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP); |
134 | ||
135 | if (xfs_icsb_init_counters(mp)) { | |
136 | mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB; | |
137 | } | |
1da177e4 | 138 | |
007c61c6 | 139 | spin_lock_init(&mp->m_sb_lock); |
794ee1ba | 140 | mutex_init(&mp->m_ilock); |
cc92e7ac | 141 | mutex_init(&mp->m_growlock); |
1da177e4 LT |
142 | atomic_set(&mp->m_active_trans, 0); |
143 | ||
144 | return mp; | |
145 | } | |
146 | ||
147 | /* | |
148 | * Free up the resources associated with a mount structure. Assume that | |
149 | * the structure was initially zeroed, so we can tell which fields got | |
150 | * initialized. | |
151 | */ | |
152 | void | |
153 | xfs_mount_free( | |
745f6919 | 154 | xfs_mount_t *mp) |
1da177e4 | 155 | { |
1da177e4 LT |
156 | if (mp->m_perag) { |
157 | int agno; | |
158 | ||
159 | for (agno = 0; agno < mp->m_maxagi; agno++) | |
160 | if (mp->m_perag[agno].pagb_list) | |
161 | kmem_free(mp->m_perag[agno].pagb_list, | |
162 | sizeof(xfs_perag_busy_t) * | |
163 | XFS_PAGB_NUM_SLOTS); | |
164 | kmem_free(mp->m_perag, | |
165 | sizeof(xfs_perag_t) * mp->m_sb.sb_agcount); | |
166 | } | |
167 | ||
287f3dad | 168 | spinlock_destroy(&mp->m_ail_lock); |
1da177e4 LT |
169 | spinlock_destroy(&mp->m_sb_lock); |
170 | mutex_destroy(&mp->m_ilock); | |
cc92e7ac | 171 | mutex_destroy(&mp->m_growlock); |
1da177e4 LT |
172 | if (mp->m_quotainfo) |
173 | XFS_QM_DONE(mp); | |
174 | ||
175 | if (mp->m_fsname != NULL) | |
176 | kmem_free(mp->m_fsname, mp->m_fsname_len); | |
fc1f8c1c NS |
177 | if (mp->m_rtname != NULL) |
178 | kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1); | |
179 | if (mp->m_logname != NULL) | |
180 | kmem_free(mp->m_logname, strlen(mp->m_logname) + 1); | |
1da177e4 | 181 | |
8d280b98 | 182 | xfs_icsb_destroy_counters(mp); |
1da177e4 LT |
183 | } |
184 | ||
4cc929ee NS |
185 | /* |
186 | * Check size of device based on the (data/realtime) block count. | |
187 | * Note: this check is used by the growfs code as well as mount. | |
188 | */ | |
189 | int | |
190 | xfs_sb_validate_fsb_count( | |
191 | xfs_sb_t *sbp, | |
192 | __uint64_t nblocks) | |
193 | { | |
194 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); | |
195 | ASSERT(sbp->sb_blocklog >= BBSHIFT); | |
196 | ||
197 | #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ | |
198 | if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) | |
199 | return E2BIG; | |
200 | #else /* Limited by UINT_MAX of sectors */ | |
201 | if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX) | |
202 | return E2BIG; | |
203 | #endif | |
204 | return 0; | |
205 | } | |
1da177e4 LT |
206 | |
207 | /* | |
208 | * Check the validity of the SB found. | |
209 | */ | |
210 | STATIC int | |
211 | xfs_mount_validate_sb( | |
212 | xfs_mount_t *mp, | |
764d1f89 NS |
213 | xfs_sb_t *sbp, |
214 | int flags) | |
1da177e4 LT |
215 | { |
216 | /* | |
217 | * If the log device and data device have the | |
218 | * same device number, the log is internal. | |
219 | * Consequently, the sb_logstart should be non-zero. If | |
220 | * we have a zero sb_logstart in this case, we may be trying to mount | |
221 | * a volume filesystem in a non-volume manner. | |
222 | */ | |
223 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { | |
764d1f89 | 224 | xfs_fs_mount_cmn_err(flags, "bad magic number"); |
1da177e4 LT |
225 | return XFS_ERROR(EWRONGFS); |
226 | } | |
227 | ||
62118709 | 228 | if (!xfs_sb_good_version(sbp)) { |
764d1f89 | 229 | xfs_fs_mount_cmn_err(flags, "bad version"); |
1da177e4 LT |
230 | return XFS_ERROR(EWRONGFS); |
231 | } | |
232 | ||
233 | if (unlikely( | |
234 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { | |
764d1f89 NS |
235 | xfs_fs_mount_cmn_err(flags, |
236 | "filesystem is marked as having an external log; " | |
237 | "specify logdev on the\nmount command line."); | |
238 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
239 | } |
240 | ||
241 | if (unlikely( | |
242 | sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { | |
764d1f89 NS |
243 | xfs_fs_mount_cmn_err(flags, |
244 | "filesystem is marked as having an internal log; " | |
245 | "do not specify logdev on\nthe mount command line."); | |
246 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
247 | } |
248 | ||
249 | /* | |
250 | * More sanity checking. These were stolen directly from | |
251 | * xfs_repair. | |
252 | */ | |
253 | if (unlikely( | |
254 | sbp->sb_agcount <= 0 || | |
255 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
256 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
257 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
258 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
259 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || | |
260 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
261 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
262 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
263 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || | |
264 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
9f989c94 NS |
265 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || |
266 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
267 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || | |
1da177e4 LT |
268 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || |
269 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
e50bd16f | 270 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) { |
764d1f89 | 271 | xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed"); |
1da177e4 LT |
272 | return XFS_ERROR(EFSCORRUPTED); |
273 | } | |
274 | ||
275 | /* | |
276 | * Sanity check AG count, size fields against data size field | |
277 | */ | |
278 | if (unlikely( | |
279 | sbp->sb_dblocks == 0 || | |
280 | sbp->sb_dblocks > | |
281 | (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks || | |
282 | sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) * | |
283 | sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) { | |
764d1f89 | 284 | xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed"); |
1da177e4 LT |
285 | return XFS_ERROR(EFSCORRUPTED); |
286 | } | |
287 | ||
4cc929ee NS |
288 | if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || |
289 | xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { | |
764d1f89 NS |
290 | xfs_fs_mount_cmn_err(flags, |
291 | "file system too large to be mounted on this system."); | |
1da177e4 LT |
292 | return XFS_ERROR(E2BIG); |
293 | } | |
294 | ||
295 | if (unlikely(sbp->sb_inprogress)) { | |
764d1f89 | 296 | xfs_fs_mount_cmn_err(flags, "file system busy"); |
1da177e4 LT |
297 | return XFS_ERROR(EFSCORRUPTED); |
298 | } | |
299 | ||
de20614b NS |
300 | /* |
301 | * Version 1 directory format has never worked on Linux. | |
302 | */ | |
62118709 | 303 | if (unlikely(!xfs_sb_version_hasdirv2(sbp))) { |
764d1f89 NS |
304 | xfs_fs_mount_cmn_err(flags, |
305 | "file system using version 1 directory format"); | |
de20614b NS |
306 | return XFS_ERROR(ENOSYS); |
307 | } | |
308 | ||
1da177e4 LT |
309 | /* |
310 | * Until this is fixed only page-sized or smaller data blocks work. | |
311 | */ | |
312 | if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { | |
764d1f89 NS |
313 | xfs_fs_mount_cmn_err(flags, |
314 | "file system with blocksize %d bytes", | |
1da177e4 | 315 | sbp->sb_blocksize); |
764d1f89 NS |
316 | xfs_fs_mount_cmn_err(flags, |
317 | "only pagesize (%ld) or less will currently work.", | |
1da177e4 LT |
318 | PAGE_SIZE); |
319 | return XFS_ERROR(ENOSYS); | |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
da353b0d DC |
325 | STATIC void |
326 | xfs_initialize_perag_icache( | |
327 | xfs_perag_t *pag) | |
328 | { | |
329 | if (!pag->pag_ici_init) { | |
330 | rwlock_init(&pag->pag_ici_lock); | |
331 | INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); | |
332 | pag->pag_ici_init = 1; | |
333 | } | |
334 | } | |
335 | ||
1da177e4 | 336 | xfs_agnumber_t |
c11e2c36 | 337 | xfs_initialize_perag( |
c11e2c36 NS |
338 | xfs_mount_t *mp, |
339 | xfs_agnumber_t agcount) | |
1da177e4 LT |
340 | { |
341 | xfs_agnumber_t index, max_metadata; | |
342 | xfs_perag_t *pag; | |
343 | xfs_agino_t agino; | |
344 | xfs_ino_t ino; | |
345 | xfs_sb_t *sbp = &mp->m_sb; | |
346 | xfs_ino_t max_inum = XFS_MAXINUMBER_32; | |
347 | ||
348 | /* Check to see if the filesystem can overflow 32 bit inodes */ | |
349 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); | |
350 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); | |
351 | ||
352 | /* Clear the mount flag if no inode can overflow 32 bits | |
353 | * on this filesystem, or if specifically requested.. | |
354 | */ | |
bd186aa9 | 355 | if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > max_inum) { |
1da177e4 LT |
356 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
357 | } else { | |
358 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; | |
359 | } | |
360 | ||
361 | /* If we can overflow then setup the ag headers accordingly */ | |
362 | if (mp->m_flags & XFS_MOUNT_32BITINODES) { | |
363 | /* Calculate how much should be reserved for inodes to | |
364 | * meet the max inode percentage. | |
365 | */ | |
366 | if (mp->m_maxicount) { | |
367 | __uint64_t icount; | |
368 | ||
369 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
370 | do_div(icount, 100); | |
371 | icount += sbp->sb_agblocks - 1; | |
a749ee86 | 372 | do_div(icount, sbp->sb_agblocks); |
1da177e4 LT |
373 | max_metadata = icount; |
374 | } else { | |
375 | max_metadata = agcount; | |
376 | } | |
377 | for (index = 0; index < agcount; index++) { | |
378 | ino = XFS_AGINO_TO_INO(mp, index, agino); | |
379 | if (ino > max_inum) { | |
380 | index++; | |
381 | break; | |
382 | } | |
383 | ||
c41564b5 | 384 | /* This ag is preferred for inodes */ |
1da177e4 LT |
385 | pag = &mp->m_perag[index]; |
386 | pag->pagi_inodeok = 1; | |
387 | if (index < max_metadata) | |
388 | pag->pagf_metadata = 1; | |
da353b0d | 389 | xfs_initialize_perag_icache(pag); |
1da177e4 LT |
390 | } |
391 | } else { | |
392 | /* Setup default behavior for smaller filesystems */ | |
393 | for (index = 0; index < agcount; index++) { | |
394 | pag = &mp->m_perag[index]; | |
395 | pag->pagi_inodeok = 1; | |
da353b0d | 396 | xfs_initialize_perag_icache(pag); |
1da177e4 LT |
397 | } |
398 | } | |
399 | return index; | |
400 | } | |
401 | ||
2bdf7cd0 CH |
402 | void |
403 | xfs_sb_from_disk( | |
404 | xfs_sb_t *to, | |
405 | xfs_dsb_t *from) | |
406 | { | |
407 | to->sb_magicnum = be32_to_cpu(from->sb_magicnum); | |
408 | to->sb_blocksize = be32_to_cpu(from->sb_blocksize); | |
409 | to->sb_dblocks = be64_to_cpu(from->sb_dblocks); | |
410 | to->sb_rblocks = be64_to_cpu(from->sb_rblocks); | |
411 | to->sb_rextents = be64_to_cpu(from->sb_rextents); | |
412 | memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); | |
413 | to->sb_logstart = be64_to_cpu(from->sb_logstart); | |
414 | to->sb_rootino = be64_to_cpu(from->sb_rootino); | |
415 | to->sb_rbmino = be64_to_cpu(from->sb_rbmino); | |
416 | to->sb_rsumino = be64_to_cpu(from->sb_rsumino); | |
417 | to->sb_rextsize = be32_to_cpu(from->sb_rextsize); | |
418 | to->sb_agblocks = be32_to_cpu(from->sb_agblocks); | |
419 | to->sb_agcount = be32_to_cpu(from->sb_agcount); | |
420 | to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); | |
421 | to->sb_logblocks = be32_to_cpu(from->sb_logblocks); | |
422 | to->sb_versionnum = be16_to_cpu(from->sb_versionnum); | |
423 | to->sb_sectsize = be16_to_cpu(from->sb_sectsize); | |
424 | to->sb_inodesize = be16_to_cpu(from->sb_inodesize); | |
425 | to->sb_inopblock = be16_to_cpu(from->sb_inopblock); | |
426 | memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); | |
427 | to->sb_blocklog = from->sb_blocklog; | |
428 | to->sb_sectlog = from->sb_sectlog; | |
429 | to->sb_inodelog = from->sb_inodelog; | |
430 | to->sb_inopblog = from->sb_inopblog; | |
431 | to->sb_agblklog = from->sb_agblklog; | |
432 | to->sb_rextslog = from->sb_rextslog; | |
433 | to->sb_inprogress = from->sb_inprogress; | |
434 | to->sb_imax_pct = from->sb_imax_pct; | |
435 | to->sb_icount = be64_to_cpu(from->sb_icount); | |
436 | to->sb_ifree = be64_to_cpu(from->sb_ifree); | |
437 | to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); | |
438 | to->sb_frextents = be64_to_cpu(from->sb_frextents); | |
439 | to->sb_uquotino = be64_to_cpu(from->sb_uquotino); | |
440 | to->sb_gquotino = be64_to_cpu(from->sb_gquotino); | |
441 | to->sb_qflags = be16_to_cpu(from->sb_qflags); | |
442 | to->sb_flags = from->sb_flags; | |
443 | to->sb_shared_vn = from->sb_shared_vn; | |
444 | to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); | |
445 | to->sb_unit = be32_to_cpu(from->sb_unit); | |
446 | to->sb_width = be32_to_cpu(from->sb_width); | |
447 | to->sb_dirblklog = from->sb_dirblklog; | |
448 | to->sb_logsectlog = from->sb_logsectlog; | |
449 | to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); | |
450 | to->sb_logsunit = be32_to_cpu(from->sb_logsunit); | |
451 | to->sb_features2 = be32_to_cpu(from->sb_features2); | |
452 | } | |
453 | ||
1da177e4 | 454 | /* |
2bdf7cd0 | 455 | * Copy in core superblock to ondisk one. |
1da177e4 | 456 | * |
2bdf7cd0 | 457 | * The fields argument is mask of superblock fields to copy. |
1da177e4 LT |
458 | */ |
459 | void | |
2bdf7cd0 CH |
460 | xfs_sb_to_disk( |
461 | xfs_dsb_t *to, | |
462 | xfs_sb_t *from, | |
1da177e4 LT |
463 | __int64_t fields) |
464 | { | |
2bdf7cd0 CH |
465 | xfs_caddr_t to_ptr = (xfs_caddr_t)to; |
466 | xfs_caddr_t from_ptr = (xfs_caddr_t)from; | |
1da177e4 LT |
467 | xfs_sb_field_t f; |
468 | int first; | |
469 | int size; | |
470 | ||
1da177e4 | 471 | ASSERT(fields); |
1da177e4 LT |
472 | if (!fields) |
473 | return; | |
474 | ||
1da177e4 LT |
475 | while (fields) { |
476 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
477 | first = xfs_sb_info[f].offset; | |
478 | size = xfs_sb_info[f + 1].offset - first; | |
479 | ||
480 | ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); | |
481 | ||
482 | if (size == 1 || xfs_sb_info[f].type == 1) { | |
2bdf7cd0 | 483 | memcpy(to_ptr + first, from_ptr + first, size); |
1da177e4 LT |
484 | } else { |
485 | switch (size) { | |
486 | case 2: | |
2bdf7cd0 CH |
487 | *(__be16 *)(to_ptr + first) = |
488 | cpu_to_be16(*(__u16 *)(from_ptr + first)); | |
1da177e4 LT |
489 | break; |
490 | case 4: | |
2bdf7cd0 CH |
491 | *(__be32 *)(to_ptr + first) = |
492 | cpu_to_be32(*(__u32 *)(from_ptr + first)); | |
1da177e4 LT |
493 | break; |
494 | case 8: | |
2bdf7cd0 CH |
495 | *(__be64 *)(to_ptr + first) = |
496 | cpu_to_be64(*(__u64 *)(from_ptr + first)); | |
1da177e4 LT |
497 | break; |
498 | default: | |
499 | ASSERT(0); | |
500 | } | |
501 | } | |
502 | ||
503 | fields &= ~(1LL << f); | |
504 | } | |
505 | } | |
506 | ||
507 | /* | |
508 | * xfs_readsb | |
509 | * | |
510 | * Does the initial read of the superblock. | |
511 | */ | |
512 | int | |
764d1f89 | 513 | xfs_readsb(xfs_mount_t *mp, int flags) |
1da177e4 LT |
514 | { |
515 | unsigned int sector_size; | |
516 | unsigned int extra_flags; | |
517 | xfs_buf_t *bp; | |
1da177e4 LT |
518 | int error; |
519 | ||
520 | ASSERT(mp->m_sb_bp == NULL); | |
521 | ASSERT(mp->m_ddev_targp != NULL); | |
522 | ||
523 | /* | |
524 | * Allocate a (locked) buffer to hold the superblock. | |
525 | * This will be kept around at all times to optimize | |
526 | * access to the superblock. | |
527 | */ | |
528 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); | |
529 | extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED; | |
530 | ||
531 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
532 | BTOBB(sector_size), extra_flags); | |
533 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 534 | xfs_fs_mount_cmn_err(flags, "SB read failed"); |
1da177e4 LT |
535 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
536 | goto fail; | |
537 | } | |
538 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
539 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
540 | ||
541 | /* | |
542 | * Initialize the mount structure from the superblock. | |
543 | * But first do some basic consistency checking. | |
544 | */ | |
2bdf7cd0 | 545 | xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp)); |
1da177e4 | 546 | |
764d1f89 | 547 | error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags); |
1da177e4 | 548 | if (error) { |
764d1f89 | 549 | xfs_fs_mount_cmn_err(flags, "SB validate failed"); |
1da177e4 LT |
550 | goto fail; |
551 | } | |
552 | ||
553 | /* | |
554 | * We must be able to do sector-sized and sector-aligned IO. | |
555 | */ | |
556 | if (sector_size > mp->m_sb.sb_sectsize) { | |
764d1f89 NS |
557 | xfs_fs_mount_cmn_err(flags, |
558 | "device supports only %u byte sectors (not %u)", | |
1da177e4 LT |
559 | sector_size, mp->m_sb.sb_sectsize); |
560 | error = ENOSYS; | |
561 | goto fail; | |
562 | } | |
563 | ||
564 | /* | |
565 | * If device sector size is smaller than the superblock size, | |
566 | * re-read the superblock so the buffer is correctly sized. | |
567 | */ | |
568 | if (sector_size < mp->m_sb.sb_sectsize) { | |
569 | XFS_BUF_UNMANAGE(bp); | |
570 | xfs_buf_relse(bp); | |
571 | sector_size = mp->m_sb.sb_sectsize; | |
572 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
573 | BTOBB(sector_size), extra_flags); | |
574 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 575 | xfs_fs_mount_cmn_err(flags, "SB re-read failed"); |
1da177e4 LT |
576 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
577 | goto fail; | |
578 | } | |
579 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
580 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
581 | } | |
582 | ||
5478eead LM |
583 | /* Initialize per-cpu counters */ |
584 | xfs_icsb_reinit_counters(mp); | |
8d280b98 | 585 | |
1da177e4 LT |
586 | mp->m_sb_bp = bp; |
587 | xfs_buf_relse(bp); | |
588 | ASSERT(XFS_BUF_VALUSEMA(bp) > 0); | |
589 | return 0; | |
590 | ||
591 | fail: | |
592 | if (bp) { | |
593 | XFS_BUF_UNMANAGE(bp); | |
594 | xfs_buf_relse(bp); | |
595 | } | |
596 | return error; | |
597 | } | |
598 | ||
599 | ||
600 | /* | |
601 | * xfs_mount_common | |
602 | * | |
603 | * Mount initialization code establishing various mount | |
604 | * fields from the superblock associated with the given | |
605 | * mount structure | |
606 | */ | |
ba0f32d4 | 607 | STATIC void |
1da177e4 LT |
608 | xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) |
609 | { | |
610 | int i; | |
611 | ||
612 | mp->m_agfrotor = mp->m_agirotor = 0; | |
007c61c6 | 613 | spin_lock_init(&mp->m_agirotor_lock); |
1da177e4 LT |
614 | mp->m_maxagi = mp->m_sb.sb_agcount; |
615 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
616 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
617 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
618 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
619 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
620 | mp->m_litino = sbp->sb_inodesize - | |
621 | ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t)); | |
622 | mp->m_blockmask = sbp->sb_blocksize - 1; | |
623 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
624 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
625 | INIT_LIST_HEAD(&mp->m_del_inodes); | |
626 | ||
627 | /* | |
628 | * Setup for attributes, in case they get created. | |
629 | * This value is for inodes getting attributes for the first time, | |
630 | * the per-inode value is for old attribute values. | |
631 | */ | |
632 | ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048); | |
633 | switch (sbp->sb_inodesize) { | |
634 | case 256: | |
d8cc890d NS |
635 | mp->m_attroffset = XFS_LITINO(mp) - |
636 | XFS_BMDR_SPACE_CALC(MINABTPTRS); | |
1da177e4 LT |
637 | break; |
638 | case 512: | |
639 | case 1024: | |
640 | case 2048: | |
d8cc890d | 641 | mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS); |
1da177e4 LT |
642 | break; |
643 | default: | |
644 | ASSERT(0); | |
645 | } | |
646 | ASSERT(mp->m_attroffset < XFS_LITINO(mp)); | |
647 | ||
648 | for (i = 0; i < 2; i++) { | |
649 | mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
650 | xfs_alloc, i == 0); | |
651 | mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
652 | xfs_alloc, i == 0); | |
653 | } | |
654 | for (i = 0; i < 2; i++) { | |
655 | mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
656 | xfs_bmbt, i == 0); | |
657 | mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
658 | xfs_bmbt, i == 0); | |
659 | } | |
660 | for (i = 0; i < 2; i++) { | |
661 | mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
662 | xfs_inobt, i == 0); | |
663 | mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
664 | xfs_inobt, i == 0); | |
665 | } | |
666 | ||
667 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
668 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
669 | sbp->sb_inopblock); | |
670 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
671 | } | |
92821e2b DC |
672 | |
673 | /* | |
674 | * xfs_initialize_perag_data | |
675 | * | |
676 | * Read in each per-ag structure so we can count up the number of | |
677 | * allocated inodes, free inodes and used filesystem blocks as this | |
678 | * information is no longer persistent in the superblock. Once we have | |
679 | * this information, write it into the in-core superblock structure. | |
680 | */ | |
681 | STATIC int | |
682 | xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount) | |
683 | { | |
684 | xfs_agnumber_t index; | |
685 | xfs_perag_t *pag; | |
686 | xfs_sb_t *sbp = &mp->m_sb; | |
687 | uint64_t ifree = 0; | |
688 | uint64_t ialloc = 0; | |
689 | uint64_t bfree = 0; | |
690 | uint64_t bfreelst = 0; | |
691 | uint64_t btree = 0; | |
692 | int error; | |
92821e2b DC |
693 | |
694 | for (index = 0; index < agcount; index++) { | |
695 | /* | |
696 | * read the agf, then the agi. This gets us | |
697 | * all the inforamtion we need and populates the | |
698 | * per-ag structures for us. | |
699 | */ | |
700 | error = xfs_alloc_pagf_init(mp, NULL, index, 0); | |
701 | if (error) | |
702 | return error; | |
703 | ||
704 | error = xfs_ialloc_pagi_init(mp, NULL, index); | |
705 | if (error) | |
706 | return error; | |
707 | pag = &mp->m_perag[index]; | |
708 | ifree += pag->pagi_freecount; | |
709 | ialloc += pag->pagi_count; | |
710 | bfree += pag->pagf_freeblks; | |
711 | bfreelst += pag->pagf_flcount; | |
712 | btree += pag->pagf_btreeblks; | |
713 | } | |
714 | /* | |
715 | * Overwrite incore superblock counters with just-read data | |
716 | */ | |
3685c2a1 | 717 | spin_lock(&mp->m_sb_lock); |
92821e2b DC |
718 | sbp->sb_ifree = ifree; |
719 | sbp->sb_icount = ialloc; | |
720 | sbp->sb_fdblocks = bfree + bfreelst + btree; | |
3685c2a1 | 721 | spin_unlock(&mp->m_sb_lock); |
92821e2b DC |
722 | |
723 | /* Fixup the per-cpu counters as well. */ | |
724 | xfs_icsb_reinit_counters(mp); | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
1da177e4 | 729 | /* |
0771fb45 | 730 | * Update alignment values based on mount options and sb values |
1da177e4 | 731 | */ |
0771fb45 ES |
732 | STATIC int |
733 | xfs_update_alignment(xfs_mount_t *mp, int mfsi_flags, __uint64_t *update_flags) | |
1da177e4 | 734 | { |
1da177e4 | 735 | xfs_sb_t *sbp = &(mp->m_sb); |
1da177e4 | 736 | |
1da177e4 LT |
737 | if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) { |
738 | /* | |
739 | * If stripe unit and stripe width are not multiples | |
740 | * of the fs blocksize turn off alignment. | |
741 | */ | |
742 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || | |
743 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { | |
744 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
745 | cmn_err(CE_WARN, | |
746 | "XFS: alignment check 1 failed"); | |
0771fb45 | 747 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
748 | } |
749 | mp->m_dalign = mp->m_swidth = 0; | |
750 | } else { | |
751 | /* | |
752 | * Convert the stripe unit and width to FSBs. | |
753 | */ | |
754 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); | |
755 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { | |
756 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
0771fb45 | 757 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
758 | } |
759 | xfs_fs_cmn_err(CE_WARN, mp, | |
760 | "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)", | |
761 | mp->m_dalign, mp->m_swidth, | |
762 | sbp->sb_agblocks); | |
763 | ||
764 | mp->m_dalign = 0; | |
765 | mp->m_swidth = 0; | |
766 | } else if (mp->m_dalign) { | |
767 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); | |
768 | } else { | |
769 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
770 | xfs_fs_cmn_err(CE_WARN, mp, | |
771 | "stripe alignment turned off: sunit(%d) less than bsize(%d)", | |
772 | mp->m_dalign, | |
773 | mp->m_blockmask +1); | |
0771fb45 | 774 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
775 | } |
776 | mp->m_swidth = 0; | |
777 | } | |
778 | } | |
779 | ||
780 | /* | |
781 | * Update superblock with new values | |
782 | * and log changes | |
783 | */ | |
62118709 | 784 | if (xfs_sb_version_hasdalign(sbp)) { |
1da177e4 LT |
785 | if (sbp->sb_unit != mp->m_dalign) { |
786 | sbp->sb_unit = mp->m_dalign; | |
0771fb45 | 787 | *update_flags |= XFS_SB_UNIT; |
1da177e4 LT |
788 | } |
789 | if (sbp->sb_width != mp->m_swidth) { | |
790 | sbp->sb_width = mp->m_swidth; | |
0771fb45 | 791 | *update_flags |= XFS_SB_WIDTH; |
1da177e4 LT |
792 | } |
793 | } | |
794 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && | |
62118709 | 795 | xfs_sb_version_hasdalign(&mp->m_sb)) { |
1da177e4 LT |
796 | mp->m_dalign = sbp->sb_unit; |
797 | mp->m_swidth = sbp->sb_width; | |
798 | } | |
799 | ||
0771fb45 ES |
800 | return 0; |
801 | } | |
1da177e4 | 802 | |
0771fb45 ES |
803 | /* |
804 | * Set the maximum inode count for this filesystem | |
805 | */ | |
806 | STATIC void | |
807 | xfs_set_maxicount(xfs_mount_t *mp) | |
808 | { | |
809 | xfs_sb_t *sbp = &(mp->m_sb); | |
810 | __uint64_t icount; | |
1da177e4 | 811 | |
0771fb45 ES |
812 | if (sbp->sb_imax_pct) { |
813 | /* | |
814 | * Make sure the maximum inode count is a multiple | |
815 | * of the units we allocate inodes in. | |
1da177e4 | 816 | */ |
1da177e4 LT |
817 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; |
818 | do_div(icount, 100); | |
819 | do_div(icount, mp->m_ialloc_blks); | |
820 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << | |
821 | sbp->sb_inopblog; | |
0771fb45 | 822 | } else { |
1da177e4 | 823 | mp->m_maxicount = 0; |
1da177e4 | 824 | } |
0771fb45 ES |
825 | } |
826 | ||
827 | /* | |
828 | * Set the default minimum read and write sizes unless | |
829 | * already specified in a mount option. | |
830 | * We use smaller I/O sizes when the file system | |
831 | * is being used for NFS service (wsync mount option). | |
832 | */ | |
833 | STATIC void | |
834 | xfs_set_rw_sizes(xfs_mount_t *mp) | |
835 | { | |
836 | xfs_sb_t *sbp = &(mp->m_sb); | |
837 | int readio_log, writeio_log; | |
1da177e4 | 838 | |
1da177e4 LT |
839 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { |
840 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
841 | readio_log = XFS_WSYNC_READIO_LOG; | |
842 | writeio_log = XFS_WSYNC_WRITEIO_LOG; | |
843 | } else { | |
844 | readio_log = XFS_READIO_LOG_LARGE; | |
845 | writeio_log = XFS_WRITEIO_LOG_LARGE; | |
846 | } | |
847 | } else { | |
848 | readio_log = mp->m_readio_log; | |
849 | writeio_log = mp->m_writeio_log; | |
850 | } | |
851 | ||
1da177e4 LT |
852 | if (sbp->sb_blocklog > readio_log) { |
853 | mp->m_readio_log = sbp->sb_blocklog; | |
854 | } else { | |
855 | mp->m_readio_log = readio_log; | |
856 | } | |
857 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); | |
858 | if (sbp->sb_blocklog > writeio_log) { | |
859 | mp->m_writeio_log = sbp->sb_blocklog; | |
860 | } else { | |
861 | mp->m_writeio_log = writeio_log; | |
862 | } | |
863 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); | |
0771fb45 | 864 | } |
1da177e4 | 865 | |
0771fb45 ES |
866 | /* |
867 | * Set whether we're using inode alignment. | |
868 | */ | |
869 | STATIC void | |
870 | xfs_set_inoalignment(xfs_mount_t *mp) | |
871 | { | |
62118709 | 872 | if (xfs_sb_version_hasalign(&mp->m_sb) && |
1da177e4 LT |
873 | mp->m_sb.sb_inoalignmt >= |
874 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) | |
875 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; | |
876 | else | |
877 | mp->m_inoalign_mask = 0; | |
878 | /* | |
879 | * If we are using stripe alignment, check whether | |
880 | * the stripe unit is a multiple of the inode alignment | |
881 | */ | |
882 | if (mp->m_dalign && mp->m_inoalign_mask && | |
883 | !(mp->m_dalign & mp->m_inoalign_mask)) | |
884 | mp->m_sinoalign = mp->m_dalign; | |
885 | else | |
886 | mp->m_sinoalign = 0; | |
0771fb45 ES |
887 | } |
888 | ||
889 | /* | |
890 | * Check that the data (and log if separate) are an ok size. | |
891 | */ | |
892 | STATIC int | |
893 | xfs_check_sizes(xfs_mount_t *mp, int mfsi_flags) | |
894 | { | |
895 | xfs_buf_t *bp; | |
896 | xfs_daddr_t d; | |
897 | int error; | |
898 | ||
1da177e4 LT |
899 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); |
900 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { | |
901 | cmn_err(CE_WARN, "XFS: size check 1 failed"); | |
0771fb45 | 902 | return XFS_ERROR(E2BIG); |
1da177e4 LT |
903 | } |
904 | error = xfs_read_buf(mp, mp->m_ddev_targp, | |
905 | d - XFS_FSS_TO_BB(mp, 1), | |
906 | XFS_FSS_TO_BB(mp, 1), 0, &bp); | |
907 | if (!error) { | |
908 | xfs_buf_relse(bp); | |
909 | } else { | |
910 | cmn_err(CE_WARN, "XFS: size check 2 failed"); | |
0771fb45 | 911 | if (error == ENOSPC) |
1da177e4 | 912 | error = XFS_ERROR(E2BIG); |
0771fb45 | 913 | return error; |
1da177e4 LT |
914 | } |
915 | ||
916 | if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) && | |
917 | mp->m_logdev_targp != mp->m_ddev_targp) { | |
918 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); | |
919 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { | |
920 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
0771fb45 | 921 | return XFS_ERROR(E2BIG); |
1da177e4 LT |
922 | } |
923 | error = xfs_read_buf(mp, mp->m_logdev_targp, | |
924 | d - XFS_FSB_TO_BB(mp, 1), | |
925 | XFS_FSB_TO_BB(mp, 1), 0, &bp); | |
926 | if (!error) { | |
927 | xfs_buf_relse(bp); | |
928 | } else { | |
929 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
0771fb45 | 930 | if (error == ENOSPC) |
1da177e4 | 931 | error = XFS_ERROR(E2BIG); |
0771fb45 ES |
932 | return error; |
933 | } | |
934 | } | |
935 | return 0; | |
936 | } | |
937 | ||
938 | /* | |
939 | * xfs_mountfs | |
940 | * | |
941 | * This function does the following on an initial mount of a file system: | |
942 | * - reads the superblock from disk and init the mount struct | |
943 | * - if we're a 32-bit kernel, do a size check on the superblock | |
944 | * so we don't mount terabyte filesystems | |
945 | * - init mount struct realtime fields | |
946 | * - allocate inode hash table for fs | |
947 | * - init directory manager | |
948 | * - perform recovery and init the log manager | |
949 | */ | |
950 | int | |
951 | xfs_mountfs( | |
952 | xfs_mount_t *mp, | |
953 | int mfsi_flags) | |
954 | { | |
955 | xfs_sb_t *sbp = &(mp->m_sb); | |
956 | xfs_inode_t *rip; | |
957 | bhv_vnode_t *rvp = NULL; | |
958 | __uint64_t resblks; | |
959 | __int64_t update_flags = 0LL; | |
960 | uint quotamount, quotaflags; | |
961 | int agno; | |
962 | int uuid_mounted = 0; | |
963 | int error = 0; | |
964 | ||
965 | if (mp->m_sb_bp == NULL) { | |
966 | error = xfs_readsb(mp, mfsi_flags); | |
967 | if (error) | |
968 | return error; | |
969 | } | |
970 | xfs_mount_common(mp, sbp); | |
971 | ||
972 | /* | |
973 | * Check if sb_agblocks is aligned at stripe boundary | |
974 | * If sb_agblocks is NOT aligned turn off m_dalign since | |
975 | * allocator alignment is within an ag, therefore ag has | |
976 | * to be aligned at stripe boundary. | |
977 | */ | |
978 | error = xfs_update_alignment(mp, mfsi_flags, &update_flags); | |
979 | if (error) | |
980 | goto error1; | |
981 | ||
982 | xfs_alloc_compute_maxlevels(mp); | |
983 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); | |
984 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); | |
985 | xfs_ialloc_compute_maxlevels(mp); | |
986 | ||
987 | xfs_set_maxicount(mp); | |
988 | ||
989 | mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog); | |
990 | ||
991 | /* | |
992 | * XFS uses the uuid from the superblock as the unique | |
993 | * identifier for fsid. We can not use the uuid from the volume | |
994 | * since a single partition filesystem is identical to a single | |
995 | * partition volume/filesystem. | |
996 | */ | |
997 | if ((mfsi_flags & XFS_MFSI_SECOND) == 0 && | |
998 | (mp->m_flags & XFS_MOUNT_NOUUID) == 0) { | |
999 | if (xfs_uuid_mount(mp)) { | |
1000 | error = XFS_ERROR(EINVAL); | |
1da177e4 LT |
1001 | goto error1; |
1002 | } | |
0771fb45 | 1003 | uuid_mounted=1; |
1da177e4 LT |
1004 | } |
1005 | ||
0771fb45 ES |
1006 | /* |
1007 | * Set the minimum read and write sizes | |
1008 | */ | |
1009 | xfs_set_rw_sizes(mp); | |
1010 | ||
1011 | /* | |
1012 | * Set the inode cluster size. | |
1013 | * This may still be overridden by the file system | |
1014 | * block size if it is larger than the chosen cluster size. | |
1015 | */ | |
1016 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; | |
1017 | ||
1018 | /* | |
1019 | * Set inode alignment fields | |
1020 | */ | |
1021 | xfs_set_inoalignment(mp); | |
1022 | ||
1023 | /* | |
1024 | * Check that the data (and log if separate) are an ok size. | |
1025 | */ | |
1026 | error = xfs_check_sizes(mp, mfsi_flags); | |
1027 | if (error) | |
1028 | goto error1; | |
1029 | ||
1da177e4 LT |
1030 | /* |
1031 | * Initialize realtime fields in the mount structure | |
1032 | */ | |
0771fb45 ES |
1033 | error = xfs_rtmount_init(mp); |
1034 | if (error) { | |
1da177e4 LT |
1035 | cmn_err(CE_WARN, "XFS: RT mount failed"); |
1036 | goto error1; | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * For client case we are done now | |
1041 | */ | |
1042 | if (mfsi_flags & XFS_MFSI_CLIENT) { | |
014c2544 | 1043 | return 0; |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | /* | |
1047 | * Copies the low order bits of the timestamp and the randomly | |
1048 | * set "sequence" number out of a UUID. | |
1049 | */ | |
1050 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); | |
1051 | ||
1da177e4 LT |
1052 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ |
1053 | ||
f6c2d1fa | 1054 | xfs_dir_mount(mp); |
1da177e4 LT |
1055 | |
1056 | /* | |
1057 | * Initialize the attribute manager's entries. | |
1058 | */ | |
1059 | mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; | |
1060 | ||
1061 | /* | |
1062 | * Initialize the precomputed transaction reservations values. | |
1063 | */ | |
1064 | xfs_trans_init(mp); | |
1065 | ||
1da177e4 LT |
1066 | /* |
1067 | * Allocate and initialize the per-ag data. | |
1068 | */ | |
1069 | init_rwsem(&mp->m_peraglock); | |
1070 | mp->m_perag = | |
1071 | kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP); | |
1072 | ||
b267ce99 | 1073 | mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount); |
1da177e4 LT |
1074 | |
1075 | /* | |
1076 | * log's mount-time initialization. Perform 1st part recovery if needed | |
1077 | */ | |
1078 | if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */ | |
1079 | error = xfs_log_mount(mp, mp->m_logdev_targp, | |
1080 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), | |
1081 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); | |
1082 | if (error) { | |
1083 | cmn_err(CE_WARN, "XFS: log mount failed"); | |
1084 | goto error2; | |
1085 | } | |
1086 | } else { /* No log has been defined */ | |
1087 | cmn_err(CE_WARN, "XFS: no log defined"); | |
1088 | XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp); | |
1089 | error = XFS_ERROR(EFSCORRUPTED); | |
1090 | goto error2; | |
1091 | } | |
1092 | ||
92821e2b DC |
1093 | /* |
1094 | * Now the log is mounted, we know if it was an unclean shutdown or | |
1095 | * not. If it was, with the first phase of recovery has completed, we | |
1096 | * have consistent AG blocks on disk. We have not recovered EFIs yet, | |
1097 | * but they are recovered transactionally in the second recovery phase | |
1098 | * later. | |
1099 | * | |
1100 | * Hence we can safely re-initialise incore superblock counters from | |
1101 | * the per-ag data. These may not be correct if the filesystem was not | |
1102 | * cleanly unmounted, so we need to wait for recovery to finish before | |
1103 | * doing this. | |
1104 | * | |
1105 | * If the filesystem was cleanly unmounted, then we can trust the | |
1106 | * values in the superblock to be correct and we don't need to do | |
1107 | * anything here. | |
1108 | * | |
1109 | * If we are currently making the filesystem, the initialisation will | |
1110 | * fail as the perag data is in an undefined state. | |
1111 | */ | |
1112 | ||
1113 | if (xfs_sb_version_haslazysbcount(&mp->m_sb) && | |
1114 | !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) && | |
1115 | !mp->m_sb.sb_inprogress) { | |
1116 | error = xfs_initialize_perag_data(mp, sbp->sb_agcount); | |
1117 | if (error) { | |
1118 | goto error2; | |
1119 | } | |
1120 | } | |
1da177e4 LT |
1121 | /* |
1122 | * Get and sanity-check the root inode. | |
1123 | * Save the pointer to it in the mount structure. | |
1124 | */ | |
1125 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0); | |
1126 | if (error) { | |
1127 | cmn_err(CE_WARN, "XFS: failed to read root inode"); | |
1128 | goto error3; | |
1129 | } | |
1130 | ||
1131 | ASSERT(rip != NULL); | |
1132 | rvp = XFS_ITOV(rip); | |
1133 | ||
1134 | if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) { | |
1135 | cmn_err(CE_WARN, "XFS: corrupted root inode"); | |
b6574520 NS |
1136 | cmn_err(CE_WARN, "Device %s - root %llu is not a directory", |
1137 | XFS_BUFTARG_NAME(mp->m_ddev_targp), | |
1138 | (unsigned long long)rip->i_ino); | |
1da177e4 LT |
1139 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
1140 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, | |
1141 | mp); | |
1142 | error = XFS_ERROR(EFSCORRUPTED); | |
1143 | goto error4; | |
1144 | } | |
1145 | mp->m_rootip = rip; /* save it */ | |
1146 | ||
1147 | xfs_iunlock(rip, XFS_ILOCK_EXCL); | |
1148 | ||
1149 | /* | |
1150 | * Initialize realtime inode pointers in the mount structure | |
1151 | */ | |
0771fb45 ES |
1152 | error = xfs_rtmount_inodes(mp); |
1153 | if (error) { | |
1da177e4 LT |
1154 | /* |
1155 | * Free up the root inode. | |
1156 | */ | |
1157 | cmn_err(CE_WARN, "XFS: failed to read RT inodes"); | |
1158 | goto error4; | |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * If fs is not mounted readonly, then update the superblock | |
1163 | * unit and width changes. | |
1164 | */ | |
bd186aa9 | 1165 | if (update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) |
1da177e4 LT |
1166 | xfs_mount_log_sbunit(mp, update_flags); |
1167 | ||
1168 | /* | |
1169 | * Initialise the XFS quota management subsystem for this mount | |
1170 | */ | |
0771fb45 ES |
1171 | error = XFS_QM_INIT(mp, "amount, "aflags); |
1172 | if (error) | |
1da177e4 LT |
1173 | goto error4; |
1174 | ||
1175 | /* | |
1176 | * Finish recovering the file system. This part needed to be | |
1177 | * delayed until after the root and real-time bitmap inodes | |
1178 | * were consistently read in. | |
1179 | */ | |
1180 | error = xfs_log_mount_finish(mp, mfsi_flags); | |
1181 | if (error) { | |
1182 | cmn_err(CE_WARN, "XFS: log mount finish failed"); | |
1183 | goto error4; | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * Complete the quota initialisation, post-log-replay component. | |
1188 | */ | |
0771fb45 ES |
1189 | error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags); |
1190 | if (error) | |
1da177e4 LT |
1191 | goto error4; |
1192 | ||
84e1e99f DC |
1193 | /* |
1194 | * Now we are mounted, reserve a small amount of unused space for | |
1195 | * privileged transactions. This is needed so that transaction | |
1196 | * space required for critical operations can dip into this pool | |
1197 | * when at ENOSPC. This is needed for operations like create with | |
1198 | * attr, unwritten extent conversion at ENOSPC, etc. Data allocations | |
1199 | * are not allowed to use this reserved space. | |
1200 | * | |
1201 | * We default to 5% or 1024 fsbs of space reserved, whichever is smaller. | |
1202 | * This may drive us straight to ENOSPC on mount, but that implies | |
1203 | * we were already there on the last unmount. | |
1204 | */ | |
39726be2 CH |
1205 | resblks = mp->m_sb.sb_dblocks; |
1206 | do_div(resblks, 20); | |
1207 | resblks = min_t(__uint64_t, resblks, 1024); | |
84e1e99f DC |
1208 | xfs_reserve_blocks(mp, &resblks, NULL); |
1209 | ||
1da177e4 LT |
1210 | return 0; |
1211 | ||
1212 | error4: | |
1213 | /* | |
1214 | * Free up the root inode. | |
1215 | */ | |
1216 | VN_RELE(rvp); | |
1217 | error3: | |
1218 | xfs_log_unmount_dealloc(mp); | |
1219 | error2: | |
1da177e4 LT |
1220 | for (agno = 0; agno < sbp->sb_agcount; agno++) |
1221 | if (mp->m_perag[agno].pagb_list) | |
1222 | kmem_free(mp->m_perag[agno].pagb_list, | |
1223 | sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS); | |
1224 | kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t)); | |
1225 | mp->m_perag = NULL; | |
1226 | /* FALLTHROUGH */ | |
1227 | error1: | |
1228 | if (uuid_mounted) | |
1229 | xfs_uuid_unmount(mp); | |
1230 | xfs_freesb(mp); | |
1231 | return error; | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * xfs_unmountfs | |
1236 | * | |
1237 | * This flushes out the inodes,dquots and the superblock, unmounts the | |
1238 | * log and makes sure that incore structures are freed. | |
1239 | */ | |
1240 | int | |
1241 | xfs_unmountfs(xfs_mount_t *mp, struct cred *cr) | |
1242 | { | |
84e1e99f | 1243 | __uint64_t resblks; |
1da177e4 | 1244 | |
641c56fb DC |
1245 | /* |
1246 | * We can potentially deadlock here if we have an inode cluster | |
1247 | * that has been freed has it's buffer still pinned in memory because | |
1248 | * the transaction is still sitting in a iclog. The stale inodes | |
1249 | * on that buffer will have their flush locks held until the | |
1250 | * transaction hits the disk and the callbacks run. the inode | |
1251 | * flush takes the flush lock unconditionally and with nothing to | |
1252 | * push out the iclog we will never get that unlocked. hence we | |
1253 | * need to force the log first. | |
1254 | */ | |
1255 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
efa80278 | 1256 | xfs_iflush_all(mp); |
1da177e4 | 1257 | |
ee2a4f7c | 1258 | XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING); |
1da177e4 LT |
1259 | |
1260 | /* | |
1261 | * Flush out the log synchronously so that we know for sure | |
1262 | * that nothing is pinned. This is important because bflush() | |
1263 | * will skip pinned buffers. | |
1264 | */ | |
1265 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
1266 | ||
1267 | xfs_binval(mp->m_ddev_targp); | |
1268 | if (mp->m_rtdev_targp) { | |
1269 | xfs_binval(mp->m_rtdev_targp); | |
1270 | } | |
1271 | ||
84e1e99f DC |
1272 | /* |
1273 | * Unreserve any blocks we have so that when we unmount we don't account | |
1274 | * the reserved free space as used. This is really only necessary for | |
1275 | * lazy superblock counting because it trusts the incore superblock | |
1276 | * counters to be aboslutely correct on clean unmount. | |
1277 | * | |
1278 | * We don't bother correcting this elsewhere for lazy superblock | |
1279 | * counting because on mount of an unclean filesystem we reconstruct the | |
1280 | * correct counter value and this is irrelevant. | |
1281 | * | |
1282 | * For non-lazy counter filesystems, this doesn't matter at all because | |
1283 | * we only every apply deltas to the superblock and hence the incore | |
1284 | * value does not matter.... | |
1285 | */ | |
1286 | resblks = 0; | |
1287 | xfs_reserve_blocks(mp, &resblks, NULL); | |
1288 | ||
92821e2b | 1289 | xfs_log_sbcount(mp, 1); |
1da177e4 | 1290 | xfs_unmountfs_writesb(mp); |
1da177e4 | 1291 | xfs_unmountfs_wait(mp); /* wait for async bufs */ |
1da177e4 LT |
1292 | xfs_log_unmount(mp); /* Done! No more fs ops. */ |
1293 | ||
1294 | xfs_freesb(mp); | |
1295 | ||
1296 | /* | |
1297 | * All inodes from this mount point should be freed. | |
1298 | */ | |
1299 | ASSERT(mp->m_inodes == NULL); | |
1300 | ||
1da177e4 LT |
1301 | xfs_unmountfs_close(mp, cr); |
1302 | if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0) | |
1303 | xfs_uuid_unmount(mp); | |
1304 | ||
1305 | #if defined(DEBUG) || defined(INDUCE_IO_ERROR) | |
0ce4cfd4 | 1306 | xfs_errortag_clearall(mp, 0); |
1da177e4 | 1307 | #endif |
745f6919 | 1308 | xfs_mount_free(mp); |
1da177e4 LT |
1309 | return 0; |
1310 | } | |
1311 | ||
1312 | void | |
1313 | xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr) | |
1314 | { | |
49ee6c91 | 1315 | if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) |
1da177e4 LT |
1316 | xfs_free_buftarg(mp->m_logdev_targp, 1); |
1317 | if (mp->m_rtdev_targp) | |
1318 | xfs_free_buftarg(mp->m_rtdev_targp, 1); | |
1319 | xfs_free_buftarg(mp->m_ddev_targp, 0); | |
1320 | } | |
1321 | ||
ba0f32d4 | 1322 | STATIC void |
1da177e4 LT |
1323 | xfs_unmountfs_wait(xfs_mount_t *mp) |
1324 | { | |
1325 | if (mp->m_logdev_targp != mp->m_ddev_targp) | |
1326 | xfs_wait_buftarg(mp->m_logdev_targp); | |
1327 | if (mp->m_rtdev_targp) | |
1328 | xfs_wait_buftarg(mp->m_rtdev_targp); | |
1329 | xfs_wait_buftarg(mp->m_ddev_targp); | |
1330 | } | |
1331 | ||
92821e2b DC |
1332 | int |
1333 | xfs_fs_writable(xfs_mount_t *mp) | |
1334 | { | |
b267ce99 | 1335 | return !(xfs_test_for_freeze(mp) || XFS_FORCED_SHUTDOWN(mp) || |
bd186aa9 | 1336 | (mp->m_flags & XFS_MOUNT_RDONLY)); |
92821e2b DC |
1337 | } |
1338 | ||
1339 | /* | |
1340 | * xfs_log_sbcount | |
1341 | * | |
1342 | * Called either periodically to keep the on disk superblock values | |
1343 | * roughly up to date or from unmount to make sure the values are | |
1344 | * correct on a clean unmount. | |
1345 | * | |
1346 | * Note this code can be called during the process of freezing, so | |
1347 | * we may need to use the transaction allocator which does not not | |
1348 | * block when the transaction subsystem is in its frozen state. | |
1349 | */ | |
1350 | int | |
1351 | xfs_log_sbcount( | |
1352 | xfs_mount_t *mp, | |
1353 | uint sync) | |
1354 | { | |
1355 | xfs_trans_t *tp; | |
1356 | int error; | |
1357 | ||
1358 | if (!xfs_fs_writable(mp)) | |
1359 | return 0; | |
1360 | ||
1361 | xfs_icsb_sync_counters(mp); | |
1362 | ||
1363 | /* | |
1364 | * we don't need to do this if we are updating the superblock | |
1365 | * counters on every modification. | |
1366 | */ | |
1367 | if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) | |
1368 | return 0; | |
1369 | ||
1370 | tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT); | |
1371 | error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1372 | XFS_DEFAULT_LOG_COUNT); | |
1373 | if (error) { | |
1374 | xfs_trans_cancel(tp, 0); | |
1375 | return error; | |
1376 | } | |
1377 | ||
1378 | xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS); | |
1379 | if (sync) | |
1380 | xfs_trans_set_sync(tp); | |
1381 | xfs_trans_commit(tp, 0); | |
1382 | ||
1383 | return 0; | |
1384 | } | |
1385 | ||
2bdf7cd0 CH |
1386 | STATIC void |
1387 | xfs_mark_shared_ro( | |
1388 | xfs_mount_t *mp, | |
1389 | xfs_buf_t *bp) | |
1390 | { | |
1391 | xfs_dsb_t *sb = XFS_BUF_TO_SBP(bp); | |
1392 | __uint16_t version; | |
1393 | ||
1394 | if (!(sb->sb_flags & XFS_SBF_READONLY)) | |
1395 | sb->sb_flags |= XFS_SBF_READONLY; | |
1396 | ||
1397 | version = be16_to_cpu(sb->sb_versionnum); | |
1398 | if ((version & XFS_SB_VERSION_NUMBITS) != XFS_SB_VERSION_4 || | |
1399 | !(version & XFS_SB_VERSION_SHAREDBIT)) | |
1400 | version |= XFS_SB_VERSION_SHAREDBIT; | |
1401 | sb->sb_versionnum = cpu_to_be16(version); | |
1402 | } | |
1403 | ||
1da177e4 LT |
1404 | int |
1405 | xfs_unmountfs_writesb(xfs_mount_t *mp) | |
1406 | { | |
1407 | xfs_buf_t *sbp; | |
1da177e4 LT |
1408 | int error = 0; |
1409 | ||
1410 | /* | |
1411 | * skip superblock write if fs is read-only, or | |
1412 | * if we are doing a forced umount. | |
1413 | */ | |
bd186aa9 | 1414 | if (!((mp->m_flags & XFS_MOUNT_RDONLY) || |
1da177e4 | 1415 | XFS_FORCED_SHUTDOWN(mp))) { |
8d280b98 | 1416 | |
92821e2b | 1417 | sbp = xfs_getsb(mp, 0); |
8d280b98 | 1418 | |
1da177e4 LT |
1419 | /* |
1420 | * mark shared-readonly if desired | |
1421 | */ | |
2bdf7cd0 CH |
1422 | if (mp->m_mk_sharedro) |
1423 | xfs_mark_shared_ro(mp, sbp); | |
92821e2b | 1424 | |
1da177e4 LT |
1425 | XFS_BUF_UNDONE(sbp); |
1426 | XFS_BUF_UNREAD(sbp); | |
1427 | XFS_BUF_UNDELAYWRITE(sbp); | |
1428 | XFS_BUF_WRITE(sbp); | |
1429 | XFS_BUF_UNASYNC(sbp); | |
1430 | ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp); | |
1431 | xfsbdstrat(mp, sbp); | |
1432 | /* Nevermind errors we might get here. */ | |
1433 | error = xfs_iowait(sbp); | |
1434 | if (error) | |
1435 | xfs_ioerror_alert("xfs_unmountfs_writesb", | |
1436 | mp, sbp, XFS_BUF_ADDR(sbp)); | |
1437 | if (error && mp->m_mk_sharedro) | |
1438 | xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly"); | |
92821e2b | 1439 | xfs_buf_relse(sbp); |
1da177e4 | 1440 | } |
014c2544 | 1441 | return error; |
1da177e4 LT |
1442 | } |
1443 | ||
1444 | /* | |
1445 | * xfs_mod_sb() can be used to copy arbitrary changes to the | |
1446 | * in-core superblock into the superblock buffer to be logged. | |
1447 | * It does not provide the higher level of locking that is | |
1448 | * needed to protect the in-core superblock from concurrent | |
1449 | * access. | |
1450 | */ | |
1451 | void | |
1452 | xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) | |
1453 | { | |
1454 | xfs_buf_t *bp; | |
1455 | int first; | |
1456 | int last; | |
1457 | xfs_mount_t *mp; | |
1da177e4 LT |
1458 | xfs_sb_field_t f; |
1459 | ||
1460 | ASSERT(fields); | |
1461 | if (!fields) | |
1462 | return; | |
1463 | mp = tp->t_mountp; | |
1464 | bp = xfs_trans_getsb(tp, mp, 0); | |
1da177e4 LT |
1465 | first = sizeof(xfs_sb_t); |
1466 | last = 0; | |
1467 | ||
1468 | /* translate/copy */ | |
1469 | ||
2bdf7cd0 | 1470 | xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields); |
1da177e4 LT |
1471 | |
1472 | /* find modified range */ | |
1473 | ||
1474 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
1475 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1476 | first = xfs_sb_info[f].offset; | |
1477 | ||
1478 | f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); | |
1479 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1480 | last = xfs_sb_info[f + 1].offset - 1; | |
1481 | ||
1482 | xfs_trans_log_buf(tp, bp, first, last); | |
1483 | } | |
d210a28c | 1484 | |
d210a28c | 1485 | |
1da177e4 LT |
1486 | /* |
1487 | * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply | |
1488 | * a delta to a specified field in the in-core superblock. Simply | |
1489 | * switch on the field indicated and apply the delta to that field. | |
1490 | * Fields are not allowed to dip below zero, so if the delta would | |
1491 | * do this do not apply it and return EINVAL. | |
1492 | * | |
3685c2a1 | 1493 | * The m_sb_lock must be held when this routine is called. |
1da177e4 | 1494 | */ |
8d280b98 | 1495 | int |
20f4ebf2 DC |
1496 | xfs_mod_incore_sb_unlocked( |
1497 | xfs_mount_t *mp, | |
1498 | xfs_sb_field_t field, | |
1499 | int64_t delta, | |
1500 | int rsvd) | |
1da177e4 LT |
1501 | { |
1502 | int scounter; /* short counter for 32 bit fields */ | |
1503 | long long lcounter; /* long counter for 64 bit fields */ | |
1504 | long long res_used, rem; | |
1505 | ||
1506 | /* | |
1507 | * With the in-core superblock spin lock held, switch | |
1508 | * on the indicated field. Apply the delta to the | |
1509 | * proper field. If the fields value would dip below | |
1510 | * 0, then do not apply the delta and return EINVAL. | |
1511 | */ | |
1512 | switch (field) { | |
1513 | case XFS_SBS_ICOUNT: | |
1514 | lcounter = (long long)mp->m_sb.sb_icount; | |
1515 | lcounter += delta; | |
1516 | if (lcounter < 0) { | |
1517 | ASSERT(0); | |
014c2544 | 1518 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1519 | } |
1520 | mp->m_sb.sb_icount = lcounter; | |
014c2544 | 1521 | return 0; |
1da177e4 LT |
1522 | case XFS_SBS_IFREE: |
1523 | lcounter = (long long)mp->m_sb.sb_ifree; | |
1524 | lcounter += delta; | |
1525 | if (lcounter < 0) { | |
1526 | ASSERT(0); | |
014c2544 | 1527 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1528 | } |
1529 | mp->m_sb.sb_ifree = lcounter; | |
014c2544 | 1530 | return 0; |
1da177e4 | 1531 | case XFS_SBS_FDBLOCKS: |
4be536de DC |
1532 | lcounter = (long long) |
1533 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); | |
1da177e4 LT |
1534 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
1535 | ||
1536 | if (delta > 0) { /* Putting blocks back */ | |
1537 | if (res_used > delta) { | |
1538 | mp->m_resblks_avail += delta; | |
1539 | } else { | |
1540 | rem = delta - res_used; | |
1541 | mp->m_resblks_avail = mp->m_resblks; | |
1542 | lcounter += rem; | |
1543 | } | |
1544 | } else { /* Taking blocks away */ | |
1545 | ||
1546 | lcounter += delta; | |
1547 | ||
1548 | /* | |
1549 | * If were out of blocks, use any available reserved blocks if | |
1550 | * were allowed to. | |
1551 | */ | |
1552 | ||
1553 | if (lcounter < 0) { | |
1554 | if (rsvd) { | |
1555 | lcounter = (long long)mp->m_resblks_avail + delta; | |
1556 | if (lcounter < 0) { | |
014c2544 | 1557 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1558 | } |
1559 | mp->m_resblks_avail = lcounter; | |
014c2544 | 1560 | return 0; |
1da177e4 | 1561 | } else { /* not reserved */ |
014c2544 | 1562 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1563 | } |
1564 | } | |
1565 | } | |
1566 | ||
4be536de | 1567 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
014c2544 | 1568 | return 0; |
1da177e4 LT |
1569 | case XFS_SBS_FREXTENTS: |
1570 | lcounter = (long long)mp->m_sb.sb_frextents; | |
1571 | lcounter += delta; | |
1572 | if (lcounter < 0) { | |
014c2544 | 1573 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1574 | } |
1575 | mp->m_sb.sb_frextents = lcounter; | |
014c2544 | 1576 | return 0; |
1da177e4 LT |
1577 | case XFS_SBS_DBLOCKS: |
1578 | lcounter = (long long)mp->m_sb.sb_dblocks; | |
1579 | lcounter += delta; | |
1580 | if (lcounter < 0) { | |
1581 | ASSERT(0); | |
014c2544 | 1582 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1583 | } |
1584 | mp->m_sb.sb_dblocks = lcounter; | |
014c2544 | 1585 | return 0; |
1da177e4 LT |
1586 | case XFS_SBS_AGCOUNT: |
1587 | scounter = mp->m_sb.sb_agcount; | |
1588 | scounter += delta; | |
1589 | if (scounter < 0) { | |
1590 | ASSERT(0); | |
014c2544 | 1591 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1592 | } |
1593 | mp->m_sb.sb_agcount = scounter; | |
014c2544 | 1594 | return 0; |
1da177e4 LT |
1595 | case XFS_SBS_IMAX_PCT: |
1596 | scounter = mp->m_sb.sb_imax_pct; | |
1597 | scounter += delta; | |
1598 | if (scounter < 0) { | |
1599 | ASSERT(0); | |
014c2544 | 1600 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1601 | } |
1602 | mp->m_sb.sb_imax_pct = scounter; | |
014c2544 | 1603 | return 0; |
1da177e4 LT |
1604 | case XFS_SBS_REXTSIZE: |
1605 | scounter = mp->m_sb.sb_rextsize; | |
1606 | scounter += delta; | |
1607 | if (scounter < 0) { | |
1608 | ASSERT(0); | |
014c2544 | 1609 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1610 | } |
1611 | mp->m_sb.sb_rextsize = scounter; | |
014c2544 | 1612 | return 0; |
1da177e4 LT |
1613 | case XFS_SBS_RBMBLOCKS: |
1614 | scounter = mp->m_sb.sb_rbmblocks; | |
1615 | scounter += delta; | |
1616 | if (scounter < 0) { | |
1617 | ASSERT(0); | |
014c2544 | 1618 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1619 | } |
1620 | mp->m_sb.sb_rbmblocks = scounter; | |
014c2544 | 1621 | return 0; |
1da177e4 LT |
1622 | case XFS_SBS_RBLOCKS: |
1623 | lcounter = (long long)mp->m_sb.sb_rblocks; | |
1624 | lcounter += delta; | |
1625 | if (lcounter < 0) { | |
1626 | ASSERT(0); | |
014c2544 | 1627 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1628 | } |
1629 | mp->m_sb.sb_rblocks = lcounter; | |
014c2544 | 1630 | return 0; |
1da177e4 LT |
1631 | case XFS_SBS_REXTENTS: |
1632 | lcounter = (long long)mp->m_sb.sb_rextents; | |
1633 | lcounter += delta; | |
1634 | if (lcounter < 0) { | |
1635 | ASSERT(0); | |
014c2544 | 1636 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1637 | } |
1638 | mp->m_sb.sb_rextents = lcounter; | |
014c2544 | 1639 | return 0; |
1da177e4 LT |
1640 | case XFS_SBS_REXTSLOG: |
1641 | scounter = mp->m_sb.sb_rextslog; | |
1642 | scounter += delta; | |
1643 | if (scounter < 0) { | |
1644 | ASSERT(0); | |
014c2544 | 1645 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1646 | } |
1647 | mp->m_sb.sb_rextslog = scounter; | |
014c2544 | 1648 | return 0; |
1da177e4 LT |
1649 | default: |
1650 | ASSERT(0); | |
014c2544 | 1651 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1652 | } |
1653 | } | |
1654 | ||
1655 | /* | |
1656 | * xfs_mod_incore_sb() is used to change a field in the in-core | |
1657 | * superblock structure by the specified delta. This modification | |
3685c2a1 | 1658 | * is protected by the m_sb_lock. Just use the xfs_mod_incore_sb_unlocked() |
1da177e4 LT |
1659 | * routine to do the work. |
1660 | */ | |
1661 | int | |
20f4ebf2 DC |
1662 | xfs_mod_incore_sb( |
1663 | xfs_mount_t *mp, | |
1664 | xfs_sb_field_t field, | |
1665 | int64_t delta, | |
1666 | int rsvd) | |
1da177e4 | 1667 | { |
1da177e4 LT |
1668 | int status; |
1669 | ||
8d280b98 DC |
1670 | /* check for per-cpu counters */ |
1671 | switch (field) { | |
1672 | #ifdef HAVE_PERCPU_SB | |
1673 | case XFS_SBS_ICOUNT: | |
1674 | case XFS_SBS_IFREE: | |
1675 | case XFS_SBS_FDBLOCKS: | |
1676 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
1677 | status = xfs_icsb_modify_counters(mp, field, | |
1678 | delta, rsvd); | |
1679 | break; | |
1680 | } | |
1681 | /* FALLTHROUGH */ | |
1682 | #endif | |
1683 | default: | |
3685c2a1 | 1684 | spin_lock(&mp->m_sb_lock); |
8d280b98 | 1685 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
3685c2a1 | 1686 | spin_unlock(&mp->m_sb_lock); |
8d280b98 DC |
1687 | break; |
1688 | } | |
1689 | ||
014c2544 | 1690 | return status; |
1da177e4 LT |
1691 | } |
1692 | ||
1693 | /* | |
1694 | * xfs_mod_incore_sb_batch() is used to change more than one field | |
1695 | * in the in-core superblock structure at a time. This modification | |
1696 | * is protected by a lock internal to this module. The fields and | |
1697 | * changes to those fields are specified in the array of xfs_mod_sb | |
1698 | * structures passed in. | |
1699 | * | |
1700 | * Either all of the specified deltas will be applied or none of | |
1701 | * them will. If any modified field dips below 0, then all modifications | |
1702 | * will be backed out and EINVAL will be returned. | |
1703 | */ | |
1704 | int | |
1705 | xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd) | |
1706 | { | |
1da177e4 LT |
1707 | int status=0; |
1708 | xfs_mod_sb_t *msbp; | |
1709 | ||
1710 | /* | |
1711 | * Loop through the array of mod structures and apply each | |
1712 | * individually. If any fail, then back out all those | |
1713 | * which have already been applied. Do all of this within | |
3685c2a1 | 1714 | * the scope of the m_sb_lock so that all of the changes will |
1da177e4 LT |
1715 | * be atomic. |
1716 | */ | |
3685c2a1 | 1717 | spin_lock(&mp->m_sb_lock); |
1da177e4 LT |
1718 | msbp = &msb[0]; |
1719 | for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) { | |
1720 | /* | |
1721 | * Apply the delta at index n. If it fails, break | |
1722 | * from the loop so we'll fall into the undo loop | |
1723 | * below. | |
1724 | */ | |
8d280b98 DC |
1725 | switch (msbp->msb_field) { |
1726 | #ifdef HAVE_PERCPU_SB | |
1727 | case XFS_SBS_ICOUNT: | |
1728 | case XFS_SBS_IFREE: | |
1729 | case XFS_SBS_FDBLOCKS: | |
1730 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
3685c2a1 | 1731 | spin_unlock(&mp->m_sb_lock); |
20b64285 | 1732 | status = xfs_icsb_modify_counters(mp, |
8d280b98 DC |
1733 | msbp->msb_field, |
1734 | msbp->msb_delta, rsvd); | |
3685c2a1 | 1735 | spin_lock(&mp->m_sb_lock); |
8d280b98 DC |
1736 | break; |
1737 | } | |
1738 | /* FALLTHROUGH */ | |
1739 | #endif | |
1740 | default: | |
1741 | status = xfs_mod_incore_sb_unlocked(mp, | |
1742 | msbp->msb_field, | |
1743 | msbp->msb_delta, rsvd); | |
1744 | break; | |
1745 | } | |
1746 | ||
1da177e4 LT |
1747 | if (status != 0) { |
1748 | break; | |
1749 | } | |
1750 | } | |
1751 | ||
1752 | /* | |
1753 | * If we didn't complete the loop above, then back out | |
1754 | * any changes made to the superblock. If you add code | |
1755 | * between the loop above and here, make sure that you | |
1756 | * preserve the value of status. Loop back until | |
1757 | * we step below the beginning of the array. Make sure | |
1758 | * we don't touch anything back there. | |
1759 | */ | |
1760 | if (status != 0) { | |
1761 | msbp--; | |
1762 | while (msbp >= msb) { | |
8d280b98 DC |
1763 | switch (msbp->msb_field) { |
1764 | #ifdef HAVE_PERCPU_SB | |
1765 | case XFS_SBS_ICOUNT: | |
1766 | case XFS_SBS_IFREE: | |
1767 | case XFS_SBS_FDBLOCKS: | |
1768 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
3685c2a1 | 1769 | spin_unlock(&mp->m_sb_lock); |
20b64285 | 1770 | status = xfs_icsb_modify_counters(mp, |
8d280b98 DC |
1771 | msbp->msb_field, |
1772 | -(msbp->msb_delta), | |
1773 | rsvd); | |
3685c2a1 | 1774 | spin_lock(&mp->m_sb_lock); |
8d280b98 DC |
1775 | break; |
1776 | } | |
1777 | /* FALLTHROUGH */ | |
1778 | #endif | |
1779 | default: | |
1780 | status = xfs_mod_incore_sb_unlocked(mp, | |
1781 | msbp->msb_field, | |
1782 | -(msbp->msb_delta), | |
1783 | rsvd); | |
1784 | break; | |
1785 | } | |
1da177e4 LT |
1786 | ASSERT(status == 0); |
1787 | msbp--; | |
1788 | } | |
1789 | } | |
3685c2a1 | 1790 | spin_unlock(&mp->m_sb_lock); |
014c2544 | 1791 | return status; |
1da177e4 LT |
1792 | } |
1793 | ||
1794 | /* | |
1795 | * xfs_getsb() is called to obtain the buffer for the superblock. | |
1796 | * The buffer is returned locked and read in from disk. | |
1797 | * The buffer should be released with a call to xfs_brelse(). | |
1798 | * | |
1799 | * If the flags parameter is BUF_TRYLOCK, then we'll only return | |
1800 | * the superblock buffer if it can be locked without sleeping. | |
1801 | * If it can't then we'll return NULL. | |
1802 | */ | |
1803 | xfs_buf_t * | |
1804 | xfs_getsb( | |
1805 | xfs_mount_t *mp, | |
1806 | int flags) | |
1807 | { | |
1808 | xfs_buf_t *bp; | |
1809 | ||
1810 | ASSERT(mp->m_sb_bp != NULL); | |
1811 | bp = mp->m_sb_bp; | |
1812 | if (flags & XFS_BUF_TRYLOCK) { | |
1813 | if (!XFS_BUF_CPSEMA(bp)) { | |
1814 | return NULL; | |
1815 | } | |
1816 | } else { | |
1817 | XFS_BUF_PSEMA(bp, PRIBIO); | |
1818 | } | |
1819 | XFS_BUF_HOLD(bp); | |
1820 | ASSERT(XFS_BUF_ISDONE(bp)); | |
014c2544 | 1821 | return bp; |
1da177e4 LT |
1822 | } |
1823 | ||
1824 | /* | |
1825 | * Used to free the superblock along various error paths. | |
1826 | */ | |
1827 | void | |
1828 | xfs_freesb( | |
1829 | xfs_mount_t *mp) | |
1830 | { | |
1831 | xfs_buf_t *bp; | |
1832 | ||
1833 | /* | |
1834 | * Use xfs_getsb() so that the buffer will be locked | |
1835 | * when we call xfs_buf_relse(). | |
1836 | */ | |
1837 | bp = xfs_getsb(mp, 0); | |
1838 | XFS_BUF_UNMANAGE(bp); | |
1839 | xfs_buf_relse(bp); | |
1840 | mp->m_sb_bp = NULL; | |
1841 | } | |
1842 | ||
1843 | /* | |
1844 | * See if the UUID is unique among mounted XFS filesystems. | |
1845 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. | |
1846 | */ | |
1847 | STATIC int | |
1848 | xfs_uuid_mount( | |
1849 | xfs_mount_t *mp) | |
1850 | { | |
1851 | if (uuid_is_nil(&mp->m_sb.sb_uuid)) { | |
1852 | cmn_err(CE_WARN, | |
1853 | "XFS: Filesystem %s has nil UUID - can't mount", | |
1854 | mp->m_fsname); | |
1855 | return -1; | |
1856 | } | |
1857 | if (!uuid_table_insert(&mp->m_sb.sb_uuid)) { | |
1858 | cmn_err(CE_WARN, | |
1859 | "XFS: Filesystem %s has duplicate UUID - can't mount", | |
1860 | mp->m_fsname); | |
1861 | return -1; | |
1862 | } | |
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | /* | |
1867 | * Remove filesystem from the UUID table. | |
1868 | */ | |
1869 | STATIC void | |
1870 | xfs_uuid_unmount( | |
1871 | xfs_mount_t *mp) | |
1872 | { | |
1873 | uuid_table_remove(&mp->m_sb.sb_uuid); | |
1874 | } | |
1875 | ||
1876 | /* | |
1877 | * Used to log changes to the superblock unit and width fields which could | |
1878 | * be altered by the mount options. Only the first superblock is updated. | |
1879 | */ | |
1880 | STATIC void | |
1881 | xfs_mount_log_sbunit( | |
1882 | xfs_mount_t *mp, | |
1883 | __int64_t fields) | |
1884 | { | |
1885 | xfs_trans_t *tp; | |
1886 | ||
1887 | ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID)); | |
1888 | ||
1889 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); | |
1890 | if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1891 | XFS_DEFAULT_LOG_COUNT)) { | |
1892 | xfs_trans_cancel(tp, 0); | |
1893 | return; | |
1894 | } | |
1895 | xfs_mod_sb(tp, fields); | |
1c72bf90 | 1896 | xfs_trans_commit(tp, 0); |
1da177e4 | 1897 | } |
8d280b98 DC |
1898 | |
1899 | ||
1900 | #ifdef HAVE_PERCPU_SB | |
1901 | /* | |
1902 | * Per-cpu incore superblock counters | |
1903 | * | |
1904 | * Simple concept, difficult implementation | |
1905 | * | |
1906 | * Basically, replace the incore superblock counters with a distributed per cpu | |
1907 | * counter for contended fields (e.g. free block count). | |
1908 | * | |
1909 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and | |
1910 | * hence needs to be accurately read when we are running low on space. Hence | |
1911 | * there is a method to enable and disable the per-cpu counters based on how | |
1912 | * much "stuff" is available in them. | |
1913 | * | |
1914 | * Basically, a counter is enabled if there is enough free resource to justify | |
1915 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local | |
1916 | * ENOSPC), then we disable the counters to synchronise all callers and | |
1917 | * re-distribute the available resources. | |
1918 | * | |
1919 | * If, once we redistributed the available resources, we still get a failure, | |
1920 | * we disable the per-cpu counter and go through the slow path. | |
1921 | * | |
1922 | * The slow path is the current xfs_mod_incore_sb() function. This means that | |
1923 | * when we disable a per-cpu counter, we need to drain it's resources back to | |
1924 | * the global superblock. We do this after disabling the counter to prevent | |
1925 | * more threads from queueing up on the counter. | |
1926 | * | |
1927 | * Essentially, this means that we still need a lock in the fast path to enable | |
1928 | * synchronisation between the global counters and the per-cpu counters. This | |
1929 | * is not a problem because the lock will be local to a CPU almost all the time | |
1930 | * and have little contention except when we get to ENOSPC conditions. | |
1931 | * | |
1932 | * Basically, this lock becomes a barrier that enables us to lock out the fast | |
1933 | * path while we do things like enabling and disabling counters and | |
1934 | * synchronising the counters. | |
1935 | * | |
1936 | * Locking rules: | |
1937 | * | |
3685c2a1 | 1938 | * 1. m_sb_lock before picking up per-cpu locks |
8d280b98 | 1939 | * 2. per-cpu locks always picked up via for_each_online_cpu() order |
3685c2a1 | 1940 | * 3. accurate counter sync requires m_sb_lock + per cpu locks |
8d280b98 | 1941 | * 4. modifying per-cpu counters requires holding per-cpu lock |
3685c2a1 ES |
1942 | * 5. modifying global counters requires holding m_sb_lock |
1943 | * 6. enabling or disabling a counter requires holding the m_sb_lock | |
8d280b98 DC |
1944 | * and _none_ of the per-cpu locks. |
1945 | * | |
1946 | * Disabled counters are only ever re-enabled by a balance operation | |
1947 | * that results in more free resources per CPU than a given threshold. | |
1948 | * To ensure counters don't remain disabled, they are rebalanced when | |
1949 | * the global resource goes above a higher threshold (i.e. some hysteresis | |
1950 | * is present to prevent thrashing). | |
e8234a68 DC |
1951 | */ |
1952 | ||
5a67e4c5 | 1953 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1954 | /* |
1955 | * hot-plug CPU notifier support. | |
8d280b98 | 1956 | * |
5a67e4c5 CS |
1957 | * We need a notifier per filesystem as we need to be able to identify |
1958 | * the filesystem to balance the counters out. This is achieved by | |
1959 | * having a notifier block embedded in the xfs_mount_t and doing pointer | |
1960 | * magic to get the mount pointer from the notifier block address. | |
8d280b98 | 1961 | */ |
e8234a68 DC |
1962 | STATIC int |
1963 | xfs_icsb_cpu_notify( | |
1964 | struct notifier_block *nfb, | |
1965 | unsigned long action, | |
1966 | void *hcpu) | |
1967 | { | |
1968 | xfs_icsb_cnts_t *cntp; | |
1969 | xfs_mount_t *mp; | |
e8234a68 DC |
1970 | |
1971 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); | |
1972 | cntp = (xfs_icsb_cnts_t *) | |
1973 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); | |
1974 | switch (action) { | |
1975 | case CPU_UP_PREPARE: | |
8bb78442 | 1976 | case CPU_UP_PREPARE_FROZEN: |
e8234a68 DC |
1977 | /* Easy Case - initialize the area and locks, and |
1978 | * then rebalance when online does everything else for us. */ | |
01e1b69c | 1979 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 DC |
1980 | break; |
1981 | case CPU_ONLINE: | |
8bb78442 | 1982 | case CPU_ONLINE_FROZEN: |
03135cf7 | 1983 | xfs_icsb_lock(mp); |
20b64285 DC |
1984 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); |
1985 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
1986 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
03135cf7 | 1987 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1988 | break; |
1989 | case CPU_DEAD: | |
8bb78442 | 1990 | case CPU_DEAD_FROZEN: |
e8234a68 DC |
1991 | /* Disable all the counters, then fold the dead cpu's |
1992 | * count into the total on the global superblock and | |
1993 | * re-enable the counters. */ | |
03135cf7 | 1994 | xfs_icsb_lock(mp); |
3685c2a1 | 1995 | spin_lock(&mp->m_sb_lock); |
e8234a68 DC |
1996 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); |
1997 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); | |
1998 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); | |
1999 | ||
2000 | mp->m_sb.sb_icount += cntp->icsb_icount; | |
2001 | mp->m_sb.sb_ifree += cntp->icsb_ifree; | |
2002 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; | |
2003 | ||
01e1b69c | 2004 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 | 2005 | |
20b64285 DC |
2006 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, |
2007 | XFS_ICSB_SB_LOCKED, 0); | |
2008 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, | |
2009 | XFS_ICSB_SB_LOCKED, 0); | |
2010 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, | |
2011 | XFS_ICSB_SB_LOCKED, 0); | |
3685c2a1 | 2012 | spin_unlock(&mp->m_sb_lock); |
03135cf7 | 2013 | xfs_icsb_unlock(mp); |
e8234a68 DC |
2014 | break; |
2015 | } | |
2016 | ||
2017 | return NOTIFY_OK; | |
2018 | } | |
5a67e4c5 | 2019 | #endif /* CONFIG_HOTPLUG_CPU */ |
e8234a68 | 2020 | |
8d280b98 DC |
2021 | int |
2022 | xfs_icsb_init_counters( | |
2023 | xfs_mount_t *mp) | |
2024 | { | |
2025 | xfs_icsb_cnts_t *cntp; | |
2026 | int i; | |
2027 | ||
2028 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); | |
2029 | if (mp->m_sb_cnts == NULL) | |
2030 | return -ENOMEM; | |
2031 | ||
5a67e4c5 | 2032 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
2033 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; |
2034 | mp->m_icsb_notifier.priority = 0; | |
5a67e4c5 CS |
2035 | register_hotcpu_notifier(&mp->m_icsb_notifier); |
2036 | #endif /* CONFIG_HOTPLUG_CPU */ | |
e8234a68 | 2037 | |
8d280b98 DC |
2038 | for_each_online_cpu(i) { |
2039 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2040 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
8d280b98 | 2041 | } |
20b64285 DC |
2042 | |
2043 | mutex_init(&mp->m_icsb_mutex); | |
2044 | ||
8d280b98 DC |
2045 | /* |
2046 | * start with all counters disabled so that the | |
2047 | * initial balance kicks us off correctly | |
2048 | */ | |
2049 | mp->m_icsb_counters = -1; | |
2050 | return 0; | |
2051 | } | |
2052 | ||
5478eead LM |
2053 | void |
2054 | xfs_icsb_reinit_counters( | |
2055 | xfs_mount_t *mp) | |
2056 | { | |
2057 | xfs_icsb_lock(mp); | |
2058 | /* | |
2059 | * start with all counters disabled so that the | |
2060 | * initial balance kicks us off correctly | |
2061 | */ | |
2062 | mp->m_icsb_counters = -1; | |
2063 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); | |
2064 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
2065 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
2066 | xfs_icsb_unlock(mp); | |
2067 | } | |
2068 | ||
8d280b98 DC |
2069 | STATIC void |
2070 | xfs_icsb_destroy_counters( | |
2071 | xfs_mount_t *mp) | |
2072 | { | |
e8234a68 | 2073 | if (mp->m_sb_cnts) { |
5a67e4c5 | 2074 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
8d280b98 | 2075 | free_percpu(mp->m_sb_cnts); |
e8234a68 | 2076 | } |
03135cf7 | 2077 | mutex_destroy(&mp->m_icsb_mutex); |
8d280b98 DC |
2078 | } |
2079 | ||
7989cb8e | 2080 | STATIC_INLINE void |
01e1b69c DC |
2081 | xfs_icsb_lock_cntr( |
2082 | xfs_icsb_cnts_t *icsbp) | |
2083 | { | |
2084 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { | |
2085 | ndelay(1000); | |
2086 | } | |
2087 | } | |
2088 | ||
7989cb8e | 2089 | STATIC_INLINE void |
01e1b69c DC |
2090 | xfs_icsb_unlock_cntr( |
2091 | xfs_icsb_cnts_t *icsbp) | |
2092 | { | |
2093 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); | |
2094 | } | |
2095 | ||
8d280b98 | 2096 | |
7989cb8e | 2097 | STATIC_INLINE void |
8d280b98 DC |
2098 | xfs_icsb_lock_all_counters( |
2099 | xfs_mount_t *mp) | |
2100 | { | |
2101 | xfs_icsb_cnts_t *cntp; | |
2102 | int i; | |
2103 | ||
2104 | for_each_online_cpu(i) { | |
2105 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2106 | xfs_icsb_lock_cntr(cntp); |
8d280b98 DC |
2107 | } |
2108 | } | |
2109 | ||
7989cb8e | 2110 | STATIC_INLINE void |
8d280b98 DC |
2111 | xfs_icsb_unlock_all_counters( |
2112 | xfs_mount_t *mp) | |
2113 | { | |
2114 | xfs_icsb_cnts_t *cntp; | |
2115 | int i; | |
2116 | ||
2117 | for_each_online_cpu(i) { | |
2118 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 2119 | xfs_icsb_unlock_cntr(cntp); |
8d280b98 DC |
2120 | } |
2121 | } | |
2122 | ||
2123 | STATIC void | |
2124 | xfs_icsb_count( | |
2125 | xfs_mount_t *mp, | |
2126 | xfs_icsb_cnts_t *cnt, | |
2127 | int flags) | |
2128 | { | |
2129 | xfs_icsb_cnts_t *cntp; | |
2130 | int i; | |
2131 | ||
2132 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); | |
2133 | ||
2134 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2135 | xfs_icsb_lock_all_counters(mp); | |
2136 | ||
2137 | for_each_online_cpu(i) { | |
2138 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
2139 | cnt->icsb_icount += cntp->icsb_icount; | |
2140 | cnt->icsb_ifree += cntp->icsb_ifree; | |
2141 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; | |
2142 | } | |
2143 | ||
2144 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
2145 | xfs_icsb_unlock_all_counters(mp); | |
2146 | } | |
2147 | ||
2148 | STATIC int | |
2149 | xfs_icsb_counter_disabled( | |
2150 | xfs_mount_t *mp, | |
2151 | xfs_sb_field_t field) | |
2152 | { | |
2153 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2154 | return test_bit(field, &mp->m_icsb_counters); | |
2155 | } | |
2156 | ||
2157 | STATIC int | |
2158 | xfs_icsb_disable_counter( | |
2159 | xfs_mount_t *mp, | |
2160 | xfs_sb_field_t field) | |
2161 | { | |
2162 | xfs_icsb_cnts_t cnt; | |
2163 | ||
2164 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2165 | ||
20b64285 DC |
2166 | /* |
2167 | * If we are already disabled, then there is nothing to do | |
2168 | * here. We check before locking all the counters to avoid | |
2169 | * the expensive lock operation when being called in the | |
2170 | * slow path and the counter is already disabled. This is | |
2171 | * safe because the only time we set or clear this state is under | |
2172 | * the m_icsb_mutex. | |
2173 | */ | |
2174 | if (xfs_icsb_counter_disabled(mp, field)) | |
2175 | return 0; | |
2176 | ||
8d280b98 DC |
2177 | xfs_icsb_lock_all_counters(mp); |
2178 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { | |
2179 | /* drain back to superblock */ | |
2180 | ||
2181 | xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT); | |
2182 | switch(field) { | |
2183 | case XFS_SBS_ICOUNT: | |
2184 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2185 | break; | |
2186 | case XFS_SBS_IFREE: | |
2187 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2188 | break; | |
2189 | case XFS_SBS_FDBLOCKS: | |
2190 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2191 | break; | |
2192 | default: | |
2193 | BUG(); | |
2194 | } | |
2195 | } | |
2196 | ||
2197 | xfs_icsb_unlock_all_counters(mp); | |
2198 | ||
2199 | return 0; | |
2200 | } | |
2201 | ||
2202 | STATIC void | |
2203 | xfs_icsb_enable_counter( | |
2204 | xfs_mount_t *mp, | |
2205 | xfs_sb_field_t field, | |
2206 | uint64_t count, | |
2207 | uint64_t resid) | |
2208 | { | |
2209 | xfs_icsb_cnts_t *cntp; | |
2210 | int i; | |
2211 | ||
2212 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
2213 | ||
2214 | xfs_icsb_lock_all_counters(mp); | |
2215 | for_each_online_cpu(i) { | |
2216 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); | |
2217 | switch (field) { | |
2218 | case XFS_SBS_ICOUNT: | |
2219 | cntp->icsb_icount = count + resid; | |
2220 | break; | |
2221 | case XFS_SBS_IFREE: | |
2222 | cntp->icsb_ifree = count + resid; | |
2223 | break; | |
2224 | case XFS_SBS_FDBLOCKS: | |
2225 | cntp->icsb_fdblocks = count + resid; | |
2226 | break; | |
2227 | default: | |
2228 | BUG(); | |
2229 | break; | |
2230 | } | |
2231 | resid = 0; | |
2232 | } | |
2233 | clear_bit(field, &mp->m_icsb_counters); | |
2234 | xfs_icsb_unlock_all_counters(mp); | |
2235 | } | |
2236 | ||
dbcabad1 DC |
2237 | void |
2238 | xfs_icsb_sync_counters_flags( | |
8d280b98 DC |
2239 | xfs_mount_t *mp, |
2240 | int flags) | |
2241 | { | |
2242 | xfs_icsb_cnts_t cnt; | |
8d280b98 DC |
2243 | |
2244 | /* Pass 1: lock all counters */ | |
2245 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
3685c2a1 | 2246 | spin_lock(&mp->m_sb_lock); |
8d280b98 DC |
2247 | |
2248 | xfs_icsb_count(mp, &cnt, flags); | |
2249 | ||
2250 | /* Step 3: update mp->m_sb fields */ | |
2251 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) | |
2252 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
2253 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) | |
2254 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2255 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) | |
2256 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2257 | ||
2258 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
3685c2a1 | 2259 | spin_unlock(&mp->m_sb_lock); |
8d280b98 DC |
2260 | } |
2261 | ||
2262 | /* | |
2263 | * Accurate update of per-cpu counters to incore superblock | |
2264 | */ | |
2265 | STATIC void | |
2266 | xfs_icsb_sync_counters( | |
2267 | xfs_mount_t *mp) | |
2268 | { | |
dbcabad1 | 2269 | xfs_icsb_sync_counters_flags(mp, 0); |
8d280b98 DC |
2270 | } |
2271 | ||
2272 | /* | |
2273 | * Balance and enable/disable counters as necessary. | |
2274 | * | |
20b64285 DC |
2275 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
2276 | * chosen to be the same number as single on disk allocation chunk per CPU, and | |
2277 | * free blocks is something far enough zero that we aren't going thrash when we | |
2278 | * get near ENOSPC. We also need to supply a minimum we require per cpu to | |
2279 | * prevent looping endlessly when xfs_alloc_space asks for more than will | |
2280 | * be distributed to a single CPU but each CPU has enough blocks to be | |
2281 | * reenabled. | |
2282 | * | |
2283 | * Note that we can be called when counters are already disabled. | |
2284 | * xfs_icsb_disable_counter() optimises the counter locking in this case to | |
2285 | * prevent locking every per-cpu counter needlessly. | |
8d280b98 | 2286 | */ |
20b64285 DC |
2287 | |
2288 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 | |
4be536de | 2289 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
20b64285 | 2290 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
8d280b98 DC |
2291 | STATIC void |
2292 | xfs_icsb_balance_counter( | |
2293 | xfs_mount_t *mp, | |
2294 | xfs_sb_field_t field, | |
20b64285 DC |
2295 | int flags, |
2296 | int min_per_cpu) | |
8d280b98 | 2297 | { |
6fdf8ccc | 2298 | uint64_t count, resid; |
8d280b98 | 2299 | int weight = num_online_cpus(); |
20b64285 | 2300 | uint64_t min = (uint64_t)min_per_cpu; |
8d280b98 DC |
2301 | |
2302 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
3685c2a1 | 2303 | spin_lock(&mp->m_sb_lock); |
8d280b98 DC |
2304 | |
2305 | /* disable counter and sync counter */ | |
2306 | xfs_icsb_disable_counter(mp, field); | |
2307 | ||
2308 | /* update counters - first CPU gets residual*/ | |
2309 | switch (field) { | |
2310 | case XFS_SBS_ICOUNT: | |
2311 | count = mp->m_sb.sb_icount; | |
2312 | resid = do_div(count, weight); | |
20b64285 | 2313 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2314 | goto out; |
2315 | break; | |
2316 | case XFS_SBS_IFREE: | |
2317 | count = mp->m_sb.sb_ifree; | |
2318 | resid = do_div(count, weight); | |
20b64285 | 2319 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2320 | goto out; |
2321 | break; | |
2322 | case XFS_SBS_FDBLOCKS: | |
2323 | count = mp->m_sb.sb_fdblocks; | |
2324 | resid = do_div(count, weight); | |
20b64285 | 2325 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
8d280b98 DC |
2326 | goto out; |
2327 | break; | |
2328 | default: | |
2329 | BUG(); | |
6fdf8ccc | 2330 | count = resid = 0; /* quiet, gcc */ |
8d280b98 DC |
2331 | break; |
2332 | } | |
2333 | ||
2334 | xfs_icsb_enable_counter(mp, field, count, resid); | |
2335 | out: | |
2336 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
3685c2a1 | 2337 | spin_unlock(&mp->m_sb_lock); |
8d280b98 DC |
2338 | } |
2339 | ||
a8272ce0 | 2340 | STATIC int |
20b64285 | 2341 | xfs_icsb_modify_counters( |
8d280b98 DC |
2342 | xfs_mount_t *mp, |
2343 | xfs_sb_field_t field, | |
20f4ebf2 | 2344 | int64_t delta, |
20b64285 | 2345 | int rsvd) |
8d280b98 DC |
2346 | { |
2347 | xfs_icsb_cnts_t *icsbp; | |
2348 | long long lcounter; /* long counter for 64 bit fields */ | |
007c61c6 | 2349 | int cpu, ret = 0; |
8d280b98 | 2350 | |
20b64285 | 2351 | might_sleep(); |
8d280b98 DC |
2352 | again: |
2353 | cpu = get_cpu(); | |
20b64285 DC |
2354 | icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu); |
2355 | ||
2356 | /* | |
2357 | * if the counter is disabled, go to slow path | |
2358 | */ | |
8d280b98 DC |
2359 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
2360 | goto slow_path; | |
20b64285 DC |
2361 | xfs_icsb_lock_cntr(icsbp); |
2362 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { | |
2363 | xfs_icsb_unlock_cntr(icsbp); | |
2364 | goto slow_path; | |
2365 | } | |
8d280b98 DC |
2366 | |
2367 | switch (field) { | |
2368 | case XFS_SBS_ICOUNT: | |
2369 | lcounter = icsbp->icsb_icount; | |
2370 | lcounter += delta; | |
2371 | if (unlikely(lcounter < 0)) | |
20b64285 | 2372 | goto balance_counter; |
8d280b98 DC |
2373 | icsbp->icsb_icount = lcounter; |
2374 | break; | |
2375 | ||
2376 | case XFS_SBS_IFREE: | |
2377 | lcounter = icsbp->icsb_ifree; | |
2378 | lcounter += delta; | |
2379 | if (unlikely(lcounter < 0)) | |
20b64285 | 2380 | goto balance_counter; |
8d280b98 DC |
2381 | icsbp->icsb_ifree = lcounter; |
2382 | break; | |
2383 | ||
2384 | case XFS_SBS_FDBLOCKS: | |
2385 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); | |
2386 | ||
4be536de | 2387 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2388 | lcounter += delta; |
2389 | if (unlikely(lcounter < 0)) | |
20b64285 | 2390 | goto balance_counter; |
4be536de | 2391 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2392 | break; |
2393 | default: | |
2394 | BUG(); | |
2395 | break; | |
2396 | } | |
01e1b69c | 2397 | xfs_icsb_unlock_cntr(icsbp); |
8d280b98 | 2398 | put_cpu(); |
8d280b98 DC |
2399 | return 0; |
2400 | ||
8d280b98 | 2401 | slow_path: |
8d280b98 DC |
2402 | put_cpu(); |
2403 | ||
20b64285 DC |
2404 | /* |
2405 | * serialise with a mutex so we don't burn lots of cpu on | |
2406 | * the superblock lock. We still need to hold the superblock | |
2407 | * lock, however, when we modify the global structures. | |
2408 | */ | |
03135cf7 | 2409 | xfs_icsb_lock(mp); |
20b64285 DC |
2410 | |
2411 | /* | |
2412 | * Now running atomically. | |
2413 | * | |
2414 | * If the counter is enabled, someone has beaten us to rebalancing. | |
2415 | * Drop the lock and try again in the fast path.... | |
2416 | */ | |
2417 | if (!(xfs_icsb_counter_disabled(mp, field))) { | |
03135cf7 | 2418 | xfs_icsb_unlock(mp); |
8d280b98 | 2419 | goto again; |
8d280b98 DC |
2420 | } |
2421 | ||
20b64285 DC |
2422 | /* |
2423 | * The counter is currently disabled. Because we are | |
2424 | * running atomically here, we know a rebalance cannot | |
2425 | * be in progress. Hence we can go straight to operating | |
2426 | * on the global superblock. We do not call xfs_mod_incore_sb() | |
3685c2a1 | 2427 | * here even though we need to get the m_sb_lock. Doing so |
20b64285 | 2428 | * will cause us to re-enter this function and deadlock. |
3685c2a1 | 2429 | * Hence we get the m_sb_lock ourselves and then call |
20b64285 DC |
2430 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates |
2431 | * directly on the global counters. | |
2432 | */ | |
3685c2a1 | 2433 | spin_lock(&mp->m_sb_lock); |
8d280b98 | 2434 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
3685c2a1 | 2435 | spin_unlock(&mp->m_sb_lock); |
8d280b98 | 2436 | |
20b64285 DC |
2437 | /* |
2438 | * Now that we've modified the global superblock, we | |
2439 | * may be able to re-enable the distributed counters | |
2440 | * (e.g. lots of space just got freed). After that | |
2441 | * we are done. | |
2442 | */ | |
2443 | if (ret != ENOSPC) | |
2444 | xfs_icsb_balance_counter(mp, field, 0, 0); | |
03135cf7 | 2445 | xfs_icsb_unlock(mp); |
8d280b98 | 2446 | return ret; |
8d280b98 | 2447 | |
20b64285 DC |
2448 | balance_counter: |
2449 | xfs_icsb_unlock_cntr(icsbp); | |
2450 | put_cpu(); | |
8d280b98 | 2451 | |
20b64285 DC |
2452 | /* |
2453 | * We may have multiple threads here if multiple per-cpu | |
2454 | * counters run dry at the same time. This will mean we can | |
2455 | * do more balances than strictly necessary but it is not | |
2456 | * the common slowpath case. | |
2457 | */ | |
03135cf7 | 2458 | xfs_icsb_lock(mp); |
20b64285 DC |
2459 | |
2460 | /* | |
2461 | * running atomically. | |
2462 | * | |
2463 | * This will leave the counter in the correct state for future | |
2464 | * accesses. After the rebalance, we simply try again and our retry | |
2465 | * will either succeed through the fast path or slow path without | |
2466 | * another balance operation being required. | |
2467 | */ | |
2468 | xfs_icsb_balance_counter(mp, field, 0, delta); | |
03135cf7 | 2469 | xfs_icsb_unlock(mp); |
20b64285 | 2470 | goto again; |
8d280b98 | 2471 | } |
20b64285 | 2472 | |
8d280b98 | 2473 | #endif |