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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_dir2.h" |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
1da177e4 | 30 | #include "xfs_bmap_btree.h" |
a844f451 | 31 | #include "xfs_alloc_btree.h" |
1da177e4 | 32 | #include "xfs_ialloc_btree.h" |
1da177e4 | 33 | #include "xfs_dir2_sf.h" |
a844f451 | 34 | #include "xfs_attr_sf.h" |
1da177e4 LT |
35 | #include "xfs_dinode.h" |
36 | #include "xfs_inode.h" | |
a844f451 NS |
37 | #include "xfs_btree.h" |
38 | #include "xfs_ialloc.h" | |
1da177e4 LT |
39 | #include "xfs_alloc.h" |
40 | #include "xfs_rtalloc.h" | |
41 | #include "xfs_bmap.h" | |
42 | #include "xfs_error.h" | |
1da177e4 LT |
43 | #include "xfs_rw.h" |
44 | #include "xfs_quota.h" | |
45 | #include "xfs_fsops.h" | |
46 | ||
47 | STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t); | |
48 | STATIC int xfs_uuid_mount(xfs_mount_t *); | |
49 | STATIC void xfs_uuid_unmount(xfs_mount_t *mp); | |
ba0f32d4 | 50 | STATIC void xfs_unmountfs_wait(xfs_mount_t *); |
1da177e4 | 51 | |
8d280b98 DC |
52 | |
53 | #ifdef HAVE_PERCPU_SB | |
54 | STATIC void xfs_icsb_destroy_counters(xfs_mount_t *); | |
20f4ebf2 DC |
55 | STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, |
56 | int, int); | |
8d280b98 DC |
57 | STATIC void xfs_icsb_sync_counters(xfs_mount_t *); |
58 | STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t, | |
20f4ebf2 | 59 | int64_t, int); |
e8234a68 | 60 | STATIC int xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t); |
8d280b98 DC |
61 | |
62 | #else | |
63 | ||
64 | #define xfs_icsb_destroy_counters(mp) do { } while (0) | |
20b64285 | 65 | #define xfs_icsb_balance_counter(mp, a, b, c) do { } while (0) |
8d280b98 DC |
66 | #define xfs_icsb_sync_counters(mp) do { } while (0) |
67 | #define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0) | |
8d280b98 DC |
68 | |
69 | #endif | |
70 | ||
1df84c93 | 71 | static const struct { |
8d280b98 DC |
72 | short offset; |
73 | short type; /* 0 = integer | |
74 | * 1 = binary / string (no translation) | |
75 | */ | |
1da177e4 LT |
76 | } xfs_sb_info[] = { |
77 | { offsetof(xfs_sb_t, sb_magicnum), 0 }, | |
78 | { offsetof(xfs_sb_t, sb_blocksize), 0 }, | |
79 | { offsetof(xfs_sb_t, sb_dblocks), 0 }, | |
80 | { offsetof(xfs_sb_t, sb_rblocks), 0 }, | |
81 | { offsetof(xfs_sb_t, sb_rextents), 0 }, | |
82 | { offsetof(xfs_sb_t, sb_uuid), 1 }, | |
83 | { offsetof(xfs_sb_t, sb_logstart), 0 }, | |
84 | { offsetof(xfs_sb_t, sb_rootino), 0 }, | |
85 | { offsetof(xfs_sb_t, sb_rbmino), 0 }, | |
86 | { offsetof(xfs_sb_t, sb_rsumino), 0 }, | |
87 | { offsetof(xfs_sb_t, sb_rextsize), 0 }, | |
88 | { offsetof(xfs_sb_t, sb_agblocks), 0 }, | |
89 | { offsetof(xfs_sb_t, sb_agcount), 0 }, | |
90 | { offsetof(xfs_sb_t, sb_rbmblocks), 0 }, | |
91 | { offsetof(xfs_sb_t, sb_logblocks), 0 }, | |
92 | { offsetof(xfs_sb_t, sb_versionnum), 0 }, | |
93 | { offsetof(xfs_sb_t, sb_sectsize), 0 }, | |
94 | { offsetof(xfs_sb_t, sb_inodesize), 0 }, | |
95 | { offsetof(xfs_sb_t, sb_inopblock), 0 }, | |
96 | { offsetof(xfs_sb_t, sb_fname[0]), 1 }, | |
97 | { offsetof(xfs_sb_t, sb_blocklog), 0 }, | |
98 | { offsetof(xfs_sb_t, sb_sectlog), 0 }, | |
99 | { offsetof(xfs_sb_t, sb_inodelog), 0 }, | |
100 | { offsetof(xfs_sb_t, sb_inopblog), 0 }, | |
101 | { offsetof(xfs_sb_t, sb_agblklog), 0 }, | |
102 | { offsetof(xfs_sb_t, sb_rextslog), 0 }, | |
103 | { offsetof(xfs_sb_t, sb_inprogress), 0 }, | |
104 | { offsetof(xfs_sb_t, sb_imax_pct), 0 }, | |
105 | { offsetof(xfs_sb_t, sb_icount), 0 }, | |
106 | { offsetof(xfs_sb_t, sb_ifree), 0 }, | |
107 | { offsetof(xfs_sb_t, sb_fdblocks), 0 }, | |
108 | { offsetof(xfs_sb_t, sb_frextents), 0 }, | |
109 | { offsetof(xfs_sb_t, sb_uquotino), 0 }, | |
110 | { offsetof(xfs_sb_t, sb_gquotino), 0 }, | |
111 | { offsetof(xfs_sb_t, sb_qflags), 0 }, | |
112 | { offsetof(xfs_sb_t, sb_flags), 0 }, | |
113 | { offsetof(xfs_sb_t, sb_shared_vn), 0 }, | |
114 | { offsetof(xfs_sb_t, sb_inoalignmt), 0 }, | |
115 | { offsetof(xfs_sb_t, sb_unit), 0 }, | |
116 | { offsetof(xfs_sb_t, sb_width), 0 }, | |
117 | { offsetof(xfs_sb_t, sb_dirblklog), 0 }, | |
118 | { offsetof(xfs_sb_t, sb_logsectlog), 0 }, | |
119 | { offsetof(xfs_sb_t, sb_logsectsize),0 }, | |
120 | { offsetof(xfs_sb_t, sb_logsunit), 0 }, | |
121 | { offsetof(xfs_sb_t, sb_features2), 0 }, | |
122 | { sizeof(xfs_sb_t), 0 } | |
123 | }; | |
124 | ||
125 | /* | |
126 | * Return a pointer to an initialized xfs_mount structure. | |
127 | */ | |
128 | xfs_mount_t * | |
129 | xfs_mount_init(void) | |
130 | { | |
131 | xfs_mount_t *mp; | |
132 | ||
8d280b98 DC |
133 | mp = kmem_zalloc(sizeof(xfs_mount_t), KM_SLEEP); |
134 | ||
135 | if (xfs_icsb_init_counters(mp)) { | |
136 | mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB; | |
137 | } | |
1da177e4 LT |
138 | |
139 | AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail"); | |
140 | spinlock_init(&mp->m_sb_lock, "xfs_sb"); | |
794ee1ba | 141 | mutex_init(&mp->m_ilock); |
1da177e4 LT |
142 | initnsema(&mp->m_growlock, 1, "xfs_grow"); |
143 | /* | |
144 | * Initialize the AIL. | |
145 | */ | |
146 | xfs_trans_ail_init(mp); | |
147 | ||
148 | atomic_set(&mp->m_active_trans, 0); | |
149 | ||
150 | return mp; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Free up the resources associated with a mount structure. Assume that | |
155 | * the structure was initially zeroed, so we can tell which fields got | |
156 | * initialized. | |
157 | */ | |
158 | void | |
159 | xfs_mount_free( | |
8d280b98 DC |
160 | xfs_mount_t *mp, |
161 | int remove_bhv) | |
1da177e4 LT |
162 | { |
163 | if (mp->m_ihash) | |
164 | xfs_ihash_free(mp); | |
165 | if (mp->m_chash) | |
166 | xfs_chash_free(mp); | |
167 | ||
168 | if (mp->m_perag) { | |
169 | int agno; | |
170 | ||
171 | for (agno = 0; agno < mp->m_maxagi; agno++) | |
172 | if (mp->m_perag[agno].pagb_list) | |
173 | kmem_free(mp->m_perag[agno].pagb_list, | |
174 | sizeof(xfs_perag_busy_t) * | |
175 | XFS_PAGB_NUM_SLOTS); | |
176 | kmem_free(mp->m_perag, | |
177 | sizeof(xfs_perag_t) * mp->m_sb.sb_agcount); | |
178 | } | |
179 | ||
180 | AIL_LOCK_DESTROY(&mp->m_ail_lock); | |
181 | spinlock_destroy(&mp->m_sb_lock); | |
182 | mutex_destroy(&mp->m_ilock); | |
183 | freesema(&mp->m_growlock); | |
184 | if (mp->m_quotainfo) | |
185 | XFS_QM_DONE(mp); | |
186 | ||
187 | if (mp->m_fsname != NULL) | |
188 | kmem_free(mp->m_fsname, mp->m_fsname_len); | |
fc1f8c1c NS |
189 | if (mp->m_rtname != NULL) |
190 | kmem_free(mp->m_rtname, strlen(mp->m_rtname) + 1); | |
191 | if (mp->m_logname != NULL) | |
192 | kmem_free(mp->m_logname, strlen(mp->m_logname) + 1); | |
1da177e4 LT |
193 | |
194 | if (remove_bhv) { | |
b83bd138 | 195 | struct bhv_vfs *vfsp = XFS_MTOVFS(mp); |
1da177e4 LT |
196 | |
197 | bhv_remove_all_vfsops(vfsp, 0); | |
198 | VFS_REMOVEBHV(vfsp, &mp->m_bhv); | |
199 | } | |
200 | ||
8d280b98 | 201 | xfs_icsb_destroy_counters(mp); |
1da177e4 LT |
202 | kmem_free(mp, sizeof(xfs_mount_t)); |
203 | } | |
204 | ||
205 | ||
206 | /* | |
207 | * Check the validity of the SB found. | |
208 | */ | |
209 | STATIC int | |
210 | xfs_mount_validate_sb( | |
211 | xfs_mount_t *mp, | |
764d1f89 NS |
212 | xfs_sb_t *sbp, |
213 | int flags) | |
1da177e4 LT |
214 | { |
215 | /* | |
216 | * If the log device and data device have the | |
217 | * same device number, the log is internal. | |
218 | * Consequently, the sb_logstart should be non-zero. If | |
219 | * we have a zero sb_logstart in this case, we may be trying to mount | |
220 | * a volume filesystem in a non-volume manner. | |
221 | */ | |
222 | if (sbp->sb_magicnum != XFS_SB_MAGIC) { | |
764d1f89 | 223 | xfs_fs_mount_cmn_err(flags, "bad magic number"); |
1da177e4 LT |
224 | return XFS_ERROR(EWRONGFS); |
225 | } | |
226 | ||
227 | if (!XFS_SB_GOOD_VERSION(sbp)) { | |
764d1f89 | 228 | xfs_fs_mount_cmn_err(flags, "bad version"); |
1da177e4 LT |
229 | return XFS_ERROR(EWRONGFS); |
230 | } | |
231 | ||
232 | if (unlikely( | |
233 | sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { | |
764d1f89 NS |
234 | xfs_fs_mount_cmn_err(flags, |
235 | "filesystem is marked as having an external log; " | |
236 | "specify logdev on the\nmount command line."); | |
237 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
238 | } |
239 | ||
240 | if (unlikely( | |
241 | sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { | |
764d1f89 NS |
242 | xfs_fs_mount_cmn_err(flags, |
243 | "filesystem is marked as having an internal log; " | |
244 | "do not specify logdev on\nthe mount command line."); | |
245 | return XFS_ERROR(EINVAL); | |
1da177e4 LT |
246 | } |
247 | ||
248 | /* | |
249 | * More sanity checking. These were stolen directly from | |
250 | * xfs_repair. | |
251 | */ | |
252 | if (unlikely( | |
253 | sbp->sb_agcount <= 0 || | |
254 | sbp->sb_sectsize < XFS_MIN_SECTORSIZE || | |
255 | sbp->sb_sectsize > XFS_MAX_SECTORSIZE || | |
256 | sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || | |
257 | sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || | |
258 | sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || | |
259 | sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || | |
260 | sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || | |
261 | sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || | |
262 | sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || | |
263 | sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || | |
9f989c94 NS |
264 | sbp->sb_inodelog < XFS_DINODE_MIN_LOG || |
265 | sbp->sb_inodelog > XFS_DINODE_MAX_LOG || | |
266 | (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || | |
1da177e4 LT |
267 | (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) || |
268 | (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || | |
e50bd16f | 269 | (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */))) { |
764d1f89 | 270 | xfs_fs_mount_cmn_err(flags, "SB sanity check 1 failed"); |
1da177e4 LT |
271 | return XFS_ERROR(EFSCORRUPTED); |
272 | } | |
273 | ||
274 | /* | |
275 | * Sanity check AG count, size fields against data size field | |
276 | */ | |
277 | if (unlikely( | |
278 | sbp->sb_dblocks == 0 || | |
279 | sbp->sb_dblocks > | |
280 | (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks || | |
281 | sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) * | |
282 | sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) { | |
764d1f89 | 283 | xfs_fs_mount_cmn_err(flags, "SB sanity check 2 failed"); |
1da177e4 LT |
284 | return XFS_ERROR(EFSCORRUPTED); |
285 | } | |
286 | ||
287 | ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); | |
288 | ASSERT(sbp->sb_blocklog >= BBSHIFT); | |
289 | ||
290 | #if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ | |
291 | if (unlikely( | |
292 | (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX || | |
293 | (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) { | |
294 | #else /* Limited by UINT_MAX of sectors */ | |
295 | if (unlikely( | |
296 | (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX || | |
297 | (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) { | |
298 | #endif | |
764d1f89 NS |
299 | xfs_fs_mount_cmn_err(flags, |
300 | "file system too large to be mounted on this system."); | |
1da177e4 LT |
301 | return XFS_ERROR(E2BIG); |
302 | } | |
303 | ||
304 | if (unlikely(sbp->sb_inprogress)) { | |
764d1f89 | 305 | xfs_fs_mount_cmn_err(flags, "file system busy"); |
1da177e4 LT |
306 | return XFS_ERROR(EFSCORRUPTED); |
307 | } | |
308 | ||
de20614b NS |
309 | /* |
310 | * Version 1 directory format has never worked on Linux. | |
311 | */ | |
312 | if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) { | |
764d1f89 NS |
313 | xfs_fs_mount_cmn_err(flags, |
314 | "file system using version 1 directory format"); | |
de20614b NS |
315 | return XFS_ERROR(ENOSYS); |
316 | } | |
317 | ||
1da177e4 LT |
318 | /* |
319 | * Until this is fixed only page-sized or smaller data blocks work. | |
320 | */ | |
321 | if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { | |
764d1f89 NS |
322 | xfs_fs_mount_cmn_err(flags, |
323 | "file system with blocksize %d bytes", | |
1da177e4 | 324 | sbp->sb_blocksize); |
764d1f89 NS |
325 | xfs_fs_mount_cmn_err(flags, |
326 | "only pagesize (%ld) or less will currently work.", | |
1da177e4 LT |
327 | PAGE_SIZE); |
328 | return XFS_ERROR(ENOSYS); | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | xfs_agnumber_t | |
c11e2c36 | 335 | xfs_initialize_perag( |
b83bd138 | 336 | bhv_vfs_t *vfs, |
c11e2c36 NS |
337 | xfs_mount_t *mp, |
338 | xfs_agnumber_t agcount) | |
1da177e4 LT |
339 | { |
340 | xfs_agnumber_t index, max_metadata; | |
341 | xfs_perag_t *pag; | |
342 | xfs_agino_t agino; | |
343 | xfs_ino_t ino; | |
344 | xfs_sb_t *sbp = &mp->m_sb; | |
345 | xfs_ino_t max_inum = XFS_MAXINUMBER_32; | |
346 | ||
347 | /* Check to see if the filesystem can overflow 32 bit inodes */ | |
348 | agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); | |
349 | ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); | |
350 | ||
351 | /* Clear the mount flag if no inode can overflow 32 bits | |
352 | * on this filesystem, or if specifically requested.. | |
353 | */ | |
c11e2c36 | 354 | if ((vfs->vfs_flag & VFS_32BITINODES) && ino > max_inum) { |
1da177e4 LT |
355 | mp->m_flags |= XFS_MOUNT_32BITINODES; |
356 | } else { | |
357 | mp->m_flags &= ~XFS_MOUNT_32BITINODES; | |
358 | } | |
359 | ||
360 | /* If we can overflow then setup the ag headers accordingly */ | |
361 | if (mp->m_flags & XFS_MOUNT_32BITINODES) { | |
362 | /* Calculate how much should be reserved for inodes to | |
363 | * meet the max inode percentage. | |
364 | */ | |
365 | if (mp->m_maxicount) { | |
366 | __uint64_t icount; | |
367 | ||
368 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
369 | do_div(icount, 100); | |
370 | icount += sbp->sb_agblocks - 1; | |
a749ee86 | 371 | do_div(icount, sbp->sb_agblocks); |
1da177e4 LT |
372 | max_metadata = icount; |
373 | } else { | |
374 | max_metadata = agcount; | |
375 | } | |
376 | for (index = 0; index < agcount; index++) { | |
377 | ino = XFS_AGINO_TO_INO(mp, index, agino); | |
378 | if (ino > max_inum) { | |
379 | index++; | |
380 | break; | |
381 | } | |
382 | ||
c41564b5 | 383 | /* This ag is preferred for inodes */ |
1da177e4 LT |
384 | pag = &mp->m_perag[index]; |
385 | pag->pagi_inodeok = 1; | |
386 | if (index < max_metadata) | |
387 | pag->pagf_metadata = 1; | |
388 | } | |
389 | } else { | |
390 | /* Setup default behavior for smaller filesystems */ | |
391 | for (index = 0; index < agcount; index++) { | |
392 | pag = &mp->m_perag[index]; | |
393 | pag->pagi_inodeok = 1; | |
394 | } | |
395 | } | |
396 | return index; | |
397 | } | |
398 | ||
399 | /* | |
400 | * xfs_xlatesb | |
401 | * | |
402 | * data - on disk version of sb | |
403 | * sb - a superblock | |
404 | * dir - conversion direction: <0 - convert sb to buf | |
405 | * >0 - convert buf to sb | |
406 | * fields - which fields to copy (bitmask) | |
407 | */ | |
408 | void | |
409 | xfs_xlatesb( | |
410 | void *data, | |
411 | xfs_sb_t *sb, | |
412 | int dir, | |
413 | __int64_t fields) | |
414 | { | |
415 | xfs_caddr_t buf_ptr; | |
416 | xfs_caddr_t mem_ptr; | |
417 | xfs_sb_field_t f; | |
418 | int first; | |
419 | int size; | |
420 | ||
421 | ASSERT(dir); | |
422 | ASSERT(fields); | |
423 | ||
424 | if (!fields) | |
425 | return; | |
426 | ||
427 | buf_ptr = (xfs_caddr_t)data; | |
428 | mem_ptr = (xfs_caddr_t)sb; | |
429 | ||
430 | while (fields) { | |
431 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
432 | first = xfs_sb_info[f].offset; | |
433 | size = xfs_sb_info[f + 1].offset - first; | |
434 | ||
435 | ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); | |
436 | ||
437 | if (size == 1 || xfs_sb_info[f].type == 1) { | |
438 | if (dir > 0) { | |
439 | memcpy(mem_ptr + first, buf_ptr + first, size); | |
440 | } else { | |
441 | memcpy(buf_ptr + first, mem_ptr + first, size); | |
442 | } | |
443 | } else { | |
444 | switch (size) { | |
445 | case 2: | |
446 | INT_XLATE(*(__uint16_t*)(buf_ptr+first), | |
447 | *(__uint16_t*)(mem_ptr+first), | |
448 | dir, ARCH_CONVERT); | |
449 | break; | |
450 | case 4: | |
451 | INT_XLATE(*(__uint32_t*)(buf_ptr+first), | |
452 | *(__uint32_t*)(mem_ptr+first), | |
453 | dir, ARCH_CONVERT); | |
454 | break; | |
455 | case 8: | |
456 | INT_XLATE(*(__uint64_t*)(buf_ptr+first), | |
457 | *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT); | |
458 | break; | |
459 | default: | |
460 | ASSERT(0); | |
461 | } | |
462 | } | |
463 | ||
464 | fields &= ~(1LL << f); | |
465 | } | |
466 | } | |
467 | ||
468 | /* | |
469 | * xfs_readsb | |
470 | * | |
471 | * Does the initial read of the superblock. | |
472 | */ | |
473 | int | |
764d1f89 | 474 | xfs_readsb(xfs_mount_t *mp, int flags) |
1da177e4 LT |
475 | { |
476 | unsigned int sector_size; | |
477 | unsigned int extra_flags; | |
478 | xfs_buf_t *bp; | |
479 | xfs_sb_t *sbp; | |
480 | int error; | |
481 | ||
482 | ASSERT(mp->m_sb_bp == NULL); | |
483 | ASSERT(mp->m_ddev_targp != NULL); | |
484 | ||
485 | /* | |
486 | * Allocate a (locked) buffer to hold the superblock. | |
487 | * This will be kept around at all times to optimize | |
488 | * access to the superblock. | |
489 | */ | |
490 | sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); | |
491 | extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED; | |
492 | ||
493 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
494 | BTOBB(sector_size), extra_flags); | |
495 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 496 | xfs_fs_mount_cmn_err(flags, "SB read failed"); |
1da177e4 LT |
497 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
498 | goto fail; | |
499 | } | |
500 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
501 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
502 | ||
503 | /* | |
504 | * Initialize the mount structure from the superblock. | |
505 | * But first do some basic consistency checking. | |
506 | */ | |
507 | sbp = XFS_BUF_TO_SBP(bp); | |
508 | xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS); | |
509 | ||
764d1f89 | 510 | error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags); |
1da177e4 | 511 | if (error) { |
764d1f89 | 512 | xfs_fs_mount_cmn_err(flags, "SB validate failed"); |
1da177e4 LT |
513 | goto fail; |
514 | } | |
515 | ||
516 | /* | |
517 | * We must be able to do sector-sized and sector-aligned IO. | |
518 | */ | |
519 | if (sector_size > mp->m_sb.sb_sectsize) { | |
764d1f89 NS |
520 | xfs_fs_mount_cmn_err(flags, |
521 | "device supports only %u byte sectors (not %u)", | |
1da177e4 LT |
522 | sector_size, mp->m_sb.sb_sectsize); |
523 | error = ENOSYS; | |
524 | goto fail; | |
525 | } | |
526 | ||
527 | /* | |
528 | * If device sector size is smaller than the superblock size, | |
529 | * re-read the superblock so the buffer is correctly sized. | |
530 | */ | |
531 | if (sector_size < mp->m_sb.sb_sectsize) { | |
532 | XFS_BUF_UNMANAGE(bp); | |
533 | xfs_buf_relse(bp); | |
534 | sector_size = mp->m_sb.sb_sectsize; | |
535 | bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, | |
536 | BTOBB(sector_size), extra_flags); | |
537 | if (!bp || XFS_BUF_ISERROR(bp)) { | |
764d1f89 | 538 | xfs_fs_mount_cmn_err(flags, "SB re-read failed"); |
1da177e4 LT |
539 | error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM; |
540 | goto fail; | |
541 | } | |
542 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
543 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
544 | } | |
545 | ||
03135cf7 | 546 | xfs_icsb_lock(mp); |
20b64285 DC |
547 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); |
548 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
549 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
03135cf7 | 550 | xfs_icsb_unlock(mp); |
8d280b98 | 551 | |
1da177e4 LT |
552 | mp->m_sb_bp = bp; |
553 | xfs_buf_relse(bp); | |
554 | ASSERT(XFS_BUF_VALUSEMA(bp) > 0); | |
555 | return 0; | |
556 | ||
557 | fail: | |
558 | if (bp) { | |
559 | XFS_BUF_UNMANAGE(bp); | |
560 | xfs_buf_relse(bp); | |
561 | } | |
562 | return error; | |
563 | } | |
564 | ||
565 | ||
566 | /* | |
567 | * xfs_mount_common | |
568 | * | |
569 | * Mount initialization code establishing various mount | |
570 | * fields from the superblock associated with the given | |
571 | * mount structure | |
572 | */ | |
ba0f32d4 | 573 | STATIC void |
1da177e4 LT |
574 | xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) |
575 | { | |
576 | int i; | |
577 | ||
578 | mp->m_agfrotor = mp->m_agirotor = 0; | |
579 | spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock"); | |
580 | mp->m_maxagi = mp->m_sb.sb_agcount; | |
581 | mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; | |
582 | mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; | |
583 | mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; | |
584 | mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; | |
585 | mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; | |
586 | mp->m_litino = sbp->sb_inodesize - | |
587 | ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t)); | |
588 | mp->m_blockmask = sbp->sb_blocksize - 1; | |
589 | mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; | |
590 | mp->m_blockwmask = mp->m_blockwsize - 1; | |
591 | INIT_LIST_HEAD(&mp->m_del_inodes); | |
592 | ||
593 | /* | |
594 | * Setup for attributes, in case they get created. | |
595 | * This value is for inodes getting attributes for the first time, | |
596 | * the per-inode value is for old attribute values. | |
597 | */ | |
598 | ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048); | |
599 | switch (sbp->sb_inodesize) { | |
600 | case 256: | |
d8cc890d NS |
601 | mp->m_attroffset = XFS_LITINO(mp) - |
602 | XFS_BMDR_SPACE_CALC(MINABTPTRS); | |
1da177e4 LT |
603 | break; |
604 | case 512: | |
605 | case 1024: | |
606 | case 2048: | |
d8cc890d | 607 | mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS); |
1da177e4 LT |
608 | break; |
609 | default: | |
610 | ASSERT(0); | |
611 | } | |
612 | ASSERT(mp->m_attroffset < XFS_LITINO(mp)); | |
613 | ||
614 | for (i = 0; i < 2; i++) { | |
615 | mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
616 | xfs_alloc, i == 0); | |
617 | mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
618 | xfs_alloc, i == 0); | |
619 | } | |
620 | for (i = 0; i < 2; i++) { | |
621 | mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
622 | xfs_bmbt, i == 0); | |
623 | mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
624 | xfs_bmbt, i == 0); | |
625 | } | |
626 | for (i = 0; i < 2; i++) { | |
627 | mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize, | |
628 | xfs_inobt, i == 0); | |
629 | mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize, | |
630 | xfs_inobt, i == 0); | |
631 | } | |
632 | ||
633 | mp->m_bsize = XFS_FSB_TO_BB(mp, 1); | |
634 | mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, | |
635 | sbp->sb_inopblock); | |
636 | mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; | |
637 | } | |
638 | /* | |
639 | * xfs_mountfs | |
640 | * | |
641 | * This function does the following on an initial mount of a file system: | |
642 | * - reads the superblock from disk and init the mount struct | |
643 | * - if we're a 32-bit kernel, do a size check on the superblock | |
644 | * so we don't mount terabyte filesystems | |
645 | * - init mount struct realtime fields | |
646 | * - allocate inode hash table for fs | |
647 | * - init directory manager | |
648 | * - perform recovery and init the log manager | |
649 | */ | |
650 | int | |
651 | xfs_mountfs( | |
b83bd138 | 652 | bhv_vfs_t *vfsp, |
1da177e4 LT |
653 | xfs_mount_t *mp, |
654 | int mfsi_flags) | |
655 | { | |
656 | xfs_buf_t *bp; | |
657 | xfs_sb_t *sbp = &(mp->m_sb); | |
658 | xfs_inode_t *rip; | |
67fcaa73 | 659 | bhv_vnode_t *rvp = NULL; |
1da177e4 LT |
660 | int readio_log, writeio_log; |
661 | xfs_daddr_t d; | |
662 | __uint64_t ret64; | |
663 | __int64_t update_flags; | |
664 | uint quotamount, quotaflags; | |
665 | int agno; | |
666 | int uuid_mounted = 0; | |
667 | int error = 0; | |
668 | ||
669 | if (mp->m_sb_bp == NULL) { | |
764d1f89 | 670 | if ((error = xfs_readsb(mp, mfsi_flags))) { |
014c2544 | 671 | return error; |
1da177e4 LT |
672 | } |
673 | } | |
674 | xfs_mount_common(mp, sbp); | |
675 | ||
676 | /* | |
677 | * Check if sb_agblocks is aligned at stripe boundary | |
678 | * If sb_agblocks is NOT aligned turn off m_dalign since | |
679 | * allocator alignment is within an ag, therefore ag has | |
680 | * to be aligned at stripe boundary. | |
681 | */ | |
682 | update_flags = 0LL; | |
683 | if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) { | |
684 | /* | |
685 | * If stripe unit and stripe width are not multiples | |
686 | * of the fs blocksize turn off alignment. | |
687 | */ | |
688 | if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || | |
689 | (BBTOB(mp->m_swidth) & mp->m_blockmask)) { | |
690 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
691 | cmn_err(CE_WARN, | |
692 | "XFS: alignment check 1 failed"); | |
693 | error = XFS_ERROR(EINVAL); | |
694 | goto error1; | |
695 | } | |
696 | mp->m_dalign = mp->m_swidth = 0; | |
697 | } else { | |
698 | /* | |
699 | * Convert the stripe unit and width to FSBs. | |
700 | */ | |
701 | mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); | |
702 | if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { | |
703 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
704 | error = XFS_ERROR(EINVAL); | |
705 | goto error1; | |
706 | } | |
707 | xfs_fs_cmn_err(CE_WARN, mp, | |
708 | "stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)", | |
709 | mp->m_dalign, mp->m_swidth, | |
710 | sbp->sb_agblocks); | |
711 | ||
712 | mp->m_dalign = 0; | |
713 | mp->m_swidth = 0; | |
714 | } else if (mp->m_dalign) { | |
715 | mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); | |
716 | } else { | |
717 | if (mp->m_flags & XFS_MOUNT_RETERR) { | |
718 | xfs_fs_cmn_err(CE_WARN, mp, | |
719 | "stripe alignment turned off: sunit(%d) less than bsize(%d)", | |
720 | mp->m_dalign, | |
721 | mp->m_blockmask +1); | |
722 | error = XFS_ERROR(EINVAL); | |
723 | goto error1; | |
724 | } | |
725 | mp->m_swidth = 0; | |
726 | } | |
727 | } | |
728 | ||
729 | /* | |
730 | * Update superblock with new values | |
731 | * and log changes | |
732 | */ | |
733 | if (XFS_SB_VERSION_HASDALIGN(sbp)) { | |
734 | if (sbp->sb_unit != mp->m_dalign) { | |
735 | sbp->sb_unit = mp->m_dalign; | |
736 | update_flags |= XFS_SB_UNIT; | |
737 | } | |
738 | if (sbp->sb_width != mp->m_swidth) { | |
739 | sbp->sb_width = mp->m_swidth; | |
740 | update_flags |= XFS_SB_WIDTH; | |
741 | } | |
742 | } | |
743 | } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && | |
744 | XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) { | |
745 | mp->m_dalign = sbp->sb_unit; | |
746 | mp->m_swidth = sbp->sb_width; | |
747 | } | |
748 | ||
749 | xfs_alloc_compute_maxlevels(mp); | |
750 | xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); | |
751 | xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); | |
752 | xfs_ialloc_compute_maxlevels(mp); | |
753 | ||
754 | if (sbp->sb_imax_pct) { | |
755 | __uint64_t icount; | |
756 | ||
757 | /* Make sure the maximum inode count is a multiple of the | |
758 | * units we allocate inodes in. | |
759 | */ | |
760 | ||
761 | icount = sbp->sb_dblocks * sbp->sb_imax_pct; | |
762 | do_div(icount, 100); | |
763 | do_div(icount, mp->m_ialloc_blks); | |
764 | mp->m_maxicount = (icount * mp->m_ialloc_blks) << | |
765 | sbp->sb_inopblog; | |
766 | } else | |
767 | mp->m_maxicount = 0; | |
768 | ||
769 | mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog); | |
770 | ||
771 | /* | |
772 | * XFS uses the uuid from the superblock as the unique | |
773 | * identifier for fsid. We can not use the uuid from the volume | |
774 | * since a single partition filesystem is identical to a single | |
775 | * partition volume/filesystem. | |
776 | */ | |
777 | if ((mfsi_flags & XFS_MFSI_SECOND) == 0 && | |
778 | (mp->m_flags & XFS_MOUNT_NOUUID) == 0) { | |
779 | if (xfs_uuid_mount(mp)) { | |
780 | error = XFS_ERROR(EINVAL); | |
781 | goto error1; | |
782 | } | |
783 | uuid_mounted=1; | |
784 | ret64 = uuid_hash64(&sbp->sb_uuid); | |
785 | memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64)); | |
786 | } | |
787 | ||
788 | /* | |
789 | * Set the default minimum read and write sizes unless | |
790 | * already specified in a mount option. | |
791 | * We use smaller I/O sizes when the file system | |
792 | * is being used for NFS service (wsync mount option). | |
793 | */ | |
794 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { | |
795 | if (mp->m_flags & XFS_MOUNT_WSYNC) { | |
796 | readio_log = XFS_WSYNC_READIO_LOG; | |
797 | writeio_log = XFS_WSYNC_WRITEIO_LOG; | |
798 | } else { | |
799 | readio_log = XFS_READIO_LOG_LARGE; | |
800 | writeio_log = XFS_WRITEIO_LOG_LARGE; | |
801 | } | |
802 | } else { | |
803 | readio_log = mp->m_readio_log; | |
804 | writeio_log = mp->m_writeio_log; | |
805 | } | |
806 | ||
807 | /* | |
808 | * Set the number of readahead buffers to use based on | |
809 | * physical memory size. | |
810 | */ | |
811 | if (xfs_physmem <= 4096) /* <= 16MB */ | |
812 | mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB; | |
813 | else if (xfs_physmem <= 8192) /* <= 32MB */ | |
814 | mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB; | |
815 | else | |
816 | mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32; | |
817 | if (sbp->sb_blocklog > readio_log) { | |
818 | mp->m_readio_log = sbp->sb_blocklog; | |
819 | } else { | |
820 | mp->m_readio_log = readio_log; | |
821 | } | |
822 | mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); | |
823 | if (sbp->sb_blocklog > writeio_log) { | |
824 | mp->m_writeio_log = sbp->sb_blocklog; | |
825 | } else { | |
826 | mp->m_writeio_log = writeio_log; | |
827 | } | |
828 | mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); | |
829 | ||
830 | /* | |
831 | * Set the inode cluster size based on the physical memory | |
832 | * size. This may still be overridden by the file system | |
833 | * block size if it is larger than the chosen cluster size. | |
834 | */ | |
835 | if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */ | |
836 | mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE; | |
837 | } else { | |
838 | mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; | |
839 | } | |
840 | /* | |
841 | * Set whether we're using inode alignment. | |
842 | */ | |
843 | if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) && | |
844 | mp->m_sb.sb_inoalignmt >= | |
845 | XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) | |
846 | mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; | |
847 | else | |
848 | mp->m_inoalign_mask = 0; | |
849 | /* | |
850 | * If we are using stripe alignment, check whether | |
851 | * the stripe unit is a multiple of the inode alignment | |
852 | */ | |
853 | if (mp->m_dalign && mp->m_inoalign_mask && | |
854 | !(mp->m_dalign & mp->m_inoalign_mask)) | |
855 | mp->m_sinoalign = mp->m_dalign; | |
856 | else | |
857 | mp->m_sinoalign = 0; | |
858 | /* | |
859 | * Check that the data (and log if separate) are an ok size. | |
860 | */ | |
861 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); | |
862 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { | |
863 | cmn_err(CE_WARN, "XFS: size check 1 failed"); | |
864 | error = XFS_ERROR(E2BIG); | |
865 | goto error1; | |
866 | } | |
867 | error = xfs_read_buf(mp, mp->m_ddev_targp, | |
868 | d - XFS_FSS_TO_BB(mp, 1), | |
869 | XFS_FSS_TO_BB(mp, 1), 0, &bp); | |
870 | if (!error) { | |
871 | xfs_buf_relse(bp); | |
872 | } else { | |
873 | cmn_err(CE_WARN, "XFS: size check 2 failed"); | |
874 | if (error == ENOSPC) { | |
875 | error = XFS_ERROR(E2BIG); | |
876 | } | |
877 | goto error1; | |
878 | } | |
879 | ||
880 | if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) && | |
881 | mp->m_logdev_targp != mp->m_ddev_targp) { | |
882 | d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); | |
883 | if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { | |
884 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
885 | error = XFS_ERROR(E2BIG); | |
886 | goto error1; | |
887 | } | |
888 | error = xfs_read_buf(mp, mp->m_logdev_targp, | |
889 | d - XFS_FSB_TO_BB(mp, 1), | |
890 | XFS_FSB_TO_BB(mp, 1), 0, &bp); | |
891 | if (!error) { | |
892 | xfs_buf_relse(bp); | |
893 | } else { | |
894 | cmn_err(CE_WARN, "XFS: size check 3 failed"); | |
895 | if (error == ENOSPC) { | |
896 | error = XFS_ERROR(E2BIG); | |
897 | } | |
898 | goto error1; | |
899 | } | |
900 | } | |
901 | ||
902 | /* | |
903 | * Initialize realtime fields in the mount structure | |
904 | */ | |
905 | if ((error = xfs_rtmount_init(mp))) { | |
906 | cmn_err(CE_WARN, "XFS: RT mount failed"); | |
907 | goto error1; | |
908 | } | |
909 | ||
910 | /* | |
911 | * For client case we are done now | |
912 | */ | |
913 | if (mfsi_flags & XFS_MFSI_CLIENT) { | |
014c2544 | 914 | return 0; |
1da177e4 LT |
915 | } |
916 | ||
917 | /* | |
918 | * Copies the low order bits of the timestamp and the randomly | |
919 | * set "sequence" number out of a UUID. | |
920 | */ | |
921 | uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); | |
922 | ||
923 | /* | |
924 | * The vfs structure needs to have a file system independent | |
925 | * way of checking for the invariant file system ID. Since it | |
926 | * can't look at mount structures it has a pointer to the data | |
927 | * in the mount structure. | |
928 | * | |
929 | * File systems that don't support user level file handles (i.e. | |
930 | * all of them except for XFS) will leave vfs_altfsid as NULL. | |
931 | */ | |
932 | vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid; | |
933 | mp->m_dmevmask = 0; /* not persistent; set after each mount */ | |
934 | ||
f6c2d1fa | 935 | xfs_dir_mount(mp); |
1da177e4 LT |
936 | |
937 | /* | |
938 | * Initialize the attribute manager's entries. | |
939 | */ | |
940 | mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; | |
941 | ||
942 | /* | |
943 | * Initialize the precomputed transaction reservations values. | |
944 | */ | |
945 | xfs_trans_init(mp); | |
946 | ||
947 | /* | |
948 | * Allocate and initialize the inode hash table for this | |
949 | * file system. | |
950 | */ | |
951 | xfs_ihash_init(mp); | |
952 | xfs_chash_init(mp); | |
953 | ||
954 | /* | |
955 | * Allocate and initialize the per-ag data. | |
956 | */ | |
957 | init_rwsem(&mp->m_peraglock); | |
958 | mp->m_perag = | |
959 | kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP); | |
960 | ||
c11e2c36 | 961 | mp->m_maxagi = xfs_initialize_perag(vfsp, mp, sbp->sb_agcount); |
1da177e4 LT |
962 | |
963 | /* | |
964 | * log's mount-time initialization. Perform 1st part recovery if needed | |
965 | */ | |
966 | if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */ | |
967 | error = xfs_log_mount(mp, mp->m_logdev_targp, | |
968 | XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), | |
969 | XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); | |
970 | if (error) { | |
971 | cmn_err(CE_WARN, "XFS: log mount failed"); | |
972 | goto error2; | |
973 | } | |
974 | } else { /* No log has been defined */ | |
975 | cmn_err(CE_WARN, "XFS: no log defined"); | |
976 | XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp); | |
977 | error = XFS_ERROR(EFSCORRUPTED); | |
978 | goto error2; | |
979 | } | |
980 | ||
981 | /* | |
982 | * Get and sanity-check the root inode. | |
983 | * Save the pointer to it in the mount structure. | |
984 | */ | |
985 | error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0); | |
986 | if (error) { | |
987 | cmn_err(CE_WARN, "XFS: failed to read root inode"); | |
988 | goto error3; | |
989 | } | |
990 | ||
991 | ASSERT(rip != NULL); | |
992 | rvp = XFS_ITOV(rip); | |
993 | ||
994 | if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) { | |
995 | cmn_err(CE_WARN, "XFS: corrupted root inode"); | |
b6574520 NS |
996 | cmn_err(CE_WARN, "Device %s - root %llu is not a directory", |
997 | XFS_BUFTARG_NAME(mp->m_ddev_targp), | |
998 | (unsigned long long)rip->i_ino); | |
1da177e4 LT |
999 | xfs_iunlock(rip, XFS_ILOCK_EXCL); |
1000 | XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, | |
1001 | mp); | |
1002 | error = XFS_ERROR(EFSCORRUPTED); | |
1003 | goto error4; | |
1004 | } | |
1005 | mp->m_rootip = rip; /* save it */ | |
1006 | ||
1007 | xfs_iunlock(rip, XFS_ILOCK_EXCL); | |
1008 | ||
1009 | /* | |
1010 | * Initialize realtime inode pointers in the mount structure | |
1011 | */ | |
1012 | if ((error = xfs_rtmount_inodes(mp))) { | |
1013 | /* | |
1014 | * Free up the root inode. | |
1015 | */ | |
1016 | cmn_err(CE_WARN, "XFS: failed to read RT inodes"); | |
1017 | goto error4; | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * If fs is not mounted readonly, then update the superblock | |
1022 | * unit and width changes. | |
1023 | */ | |
1024 | if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY)) | |
1025 | xfs_mount_log_sbunit(mp, update_flags); | |
1026 | ||
1027 | /* | |
1028 | * Initialise the XFS quota management subsystem for this mount | |
1029 | */ | |
1030 | if ((error = XFS_QM_INIT(mp, "amount, "aflags))) | |
1031 | goto error4; | |
1032 | ||
1033 | /* | |
1034 | * Finish recovering the file system. This part needed to be | |
1035 | * delayed until after the root and real-time bitmap inodes | |
1036 | * were consistently read in. | |
1037 | */ | |
1038 | error = xfs_log_mount_finish(mp, mfsi_flags); | |
1039 | if (error) { | |
1040 | cmn_err(CE_WARN, "XFS: log mount finish failed"); | |
1041 | goto error4; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * Complete the quota initialisation, post-log-replay component. | |
1046 | */ | |
1047 | if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags))) | |
1048 | goto error4; | |
1049 | ||
1050 | return 0; | |
1051 | ||
1052 | error4: | |
1053 | /* | |
1054 | * Free up the root inode. | |
1055 | */ | |
1056 | VN_RELE(rvp); | |
1057 | error3: | |
1058 | xfs_log_unmount_dealloc(mp); | |
1059 | error2: | |
1060 | xfs_ihash_free(mp); | |
1061 | xfs_chash_free(mp); | |
1062 | for (agno = 0; agno < sbp->sb_agcount; agno++) | |
1063 | if (mp->m_perag[agno].pagb_list) | |
1064 | kmem_free(mp->m_perag[agno].pagb_list, | |
1065 | sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS); | |
1066 | kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t)); | |
1067 | mp->m_perag = NULL; | |
1068 | /* FALLTHROUGH */ | |
1069 | error1: | |
1070 | if (uuid_mounted) | |
1071 | xfs_uuid_unmount(mp); | |
1072 | xfs_freesb(mp); | |
1073 | return error; | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * xfs_unmountfs | |
1078 | * | |
1079 | * This flushes out the inodes,dquots and the superblock, unmounts the | |
1080 | * log and makes sure that incore structures are freed. | |
1081 | */ | |
1082 | int | |
1083 | xfs_unmountfs(xfs_mount_t *mp, struct cred *cr) | |
1084 | { | |
b83bd138 | 1085 | struct bhv_vfs *vfsp = XFS_MTOVFS(mp); |
1da177e4 LT |
1086 | #if defined(DEBUG) || defined(INDUCE_IO_ERROR) |
1087 | int64_t fsid; | |
1088 | #endif | |
1089 | ||
efa80278 | 1090 | xfs_iflush_all(mp); |
1da177e4 | 1091 | |
ee2a4f7c | 1092 | XFS_QM_DQPURGEALL(mp, XFS_QMOPT_QUOTALL | XFS_QMOPT_UMOUNTING); |
1da177e4 LT |
1093 | |
1094 | /* | |
1095 | * Flush out the log synchronously so that we know for sure | |
1096 | * that nothing is pinned. This is important because bflush() | |
1097 | * will skip pinned buffers. | |
1098 | */ | |
1099 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC); | |
1100 | ||
1101 | xfs_binval(mp->m_ddev_targp); | |
1102 | if (mp->m_rtdev_targp) { | |
1103 | xfs_binval(mp->m_rtdev_targp); | |
1104 | } | |
1105 | ||
1106 | xfs_unmountfs_writesb(mp); | |
1107 | ||
1108 | xfs_unmountfs_wait(mp); /* wait for async bufs */ | |
1109 | ||
1110 | xfs_log_unmount(mp); /* Done! No more fs ops. */ | |
1111 | ||
1112 | xfs_freesb(mp); | |
1113 | ||
1114 | /* | |
1115 | * All inodes from this mount point should be freed. | |
1116 | */ | |
1117 | ASSERT(mp->m_inodes == NULL); | |
1118 | ||
1da177e4 LT |
1119 | xfs_unmountfs_close(mp, cr); |
1120 | if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0) | |
1121 | xfs_uuid_unmount(mp); | |
1122 | ||
1123 | #if defined(DEBUG) || defined(INDUCE_IO_ERROR) | |
1124 | /* | |
1125 | * clear all error tags on this filesystem | |
1126 | */ | |
1127 | memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t)); | |
1128 | xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0); | |
1129 | #endif | |
1130 | XFS_IODONE(vfsp); | |
1131 | xfs_mount_free(mp, 1); | |
1132 | return 0; | |
1133 | } | |
1134 | ||
1135 | void | |
1136 | xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr) | |
1137 | { | |
1138 | if (mp->m_logdev_targp != mp->m_ddev_targp) | |
1139 | xfs_free_buftarg(mp->m_logdev_targp, 1); | |
1140 | if (mp->m_rtdev_targp) | |
1141 | xfs_free_buftarg(mp->m_rtdev_targp, 1); | |
1142 | xfs_free_buftarg(mp->m_ddev_targp, 0); | |
1143 | } | |
1144 | ||
ba0f32d4 | 1145 | STATIC void |
1da177e4 LT |
1146 | xfs_unmountfs_wait(xfs_mount_t *mp) |
1147 | { | |
1148 | if (mp->m_logdev_targp != mp->m_ddev_targp) | |
1149 | xfs_wait_buftarg(mp->m_logdev_targp); | |
1150 | if (mp->m_rtdev_targp) | |
1151 | xfs_wait_buftarg(mp->m_rtdev_targp); | |
1152 | xfs_wait_buftarg(mp->m_ddev_targp); | |
1153 | } | |
1154 | ||
1155 | int | |
1156 | xfs_unmountfs_writesb(xfs_mount_t *mp) | |
1157 | { | |
1158 | xfs_buf_t *sbp; | |
1159 | xfs_sb_t *sb; | |
1160 | int error = 0; | |
1161 | ||
1162 | /* | |
1163 | * skip superblock write if fs is read-only, or | |
1164 | * if we are doing a forced umount. | |
1165 | */ | |
1166 | sbp = xfs_getsb(mp, 0); | |
1167 | if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY || | |
1168 | XFS_FORCED_SHUTDOWN(mp))) { | |
8d280b98 DC |
1169 | |
1170 | xfs_icsb_sync_counters(mp); | |
1171 | ||
1da177e4 LT |
1172 | /* |
1173 | * mark shared-readonly if desired | |
1174 | */ | |
1175 | sb = XFS_BUF_TO_SBP(sbp); | |
1176 | if (mp->m_mk_sharedro) { | |
1177 | if (!(sb->sb_flags & XFS_SBF_READONLY)) | |
1178 | sb->sb_flags |= XFS_SBF_READONLY; | |
1179 | if (!XFS_SB_VERSION_HASSHARED(sb)) | |
1180 | XFS_SB_VERSION_ADDSHARED(sb); | |
1181 | xfs_fs_cmn_err(CE_NOTE, mp, | |
1182 | "Unmounting, marking shared read-only"); | |
1183 | } | |
1184 | XFS_BUF_UNDONE(sbp); | |
1185 | XFS_BUF_UNREAD(sbp); | |
1186 | XFS_BUF_UNDELAYWRITE(sbp); | |
1187 | XFS_BUF_WRITE(sbp); | |
1188 | XFS_BUF_UNASYNC(sbp); | |
1189 | ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp); | |
1190 | xfsbdstrat(mp, sbp); | |
1191 | /* Nevermind errors we might get here. */ | |
1192 | error = xfs_iowait(sbp); | |
1193 | if (error) | |
1194 | xfs_ioerror_alert("xfs_unmountfs_writesb", | |
1195 | mp, sbp, XFS_BUF_ADDR(sbp)); | |
1196 | if (error && mp->m_mk_sharedro) | |
1197 | xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly"); | |
1198 | } | |
1199 | xfs_buf_relse(sbp); | |
014c2544 | 1200 | return error; |
1da177e4 LT |
1201 | } |
1202 | ||
1203 | /* | |
1204 | * xfs_mod_sb() can be used to copy arbitrary changes to the | |
1205 | * in-core superblock into the superblock buffer to be logged. | |
1206 | * It does not provide the higher level of locking that is | |
1207 | * needed to protect the in-core superblock from concurrent | |
1208 | * access. | |
1209 | */ | |
1210 | void | |
1211 | xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) | |
1212 | { | |
1213 | xfs_buf_t *bp; | |
1214 | int first; | |
1215 | int last; | |
1216 | xfs_mount_t *mp; | |
1217 | xfs_sb_t *sbp; | |
1218 | xfs_sb_field_t f; | |
1219 | ||
1220 | ASSERT(fields); | |
1221 | if (!fields) | |
1222 | return; | |
1223 | mp = tp->t_mountp; | |
1224 | bp = xfs_trans_getsb(tp, mp, 0); | |
1225 | sbp = XFS_BUF_TO_SBP(bp); | |
1226 | first = sizeof(xfs_sb_t); | |
1227 | last = 0; | |
1228 | ||
1229 | /* translate/copy */ | |
1230 | ||
1231 | xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields); | |
1232 | ||
1233 | /* find modified range */ | |
1234 | ||
1235 | f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); | |
1236 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1237 | first = xfs_sb_info[f].offset; | |
1238 | ||
1239 | f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); | |
1240 | ASSERT((1LL << f) & XFS_SB_MOD_BITS); | |
1241 | last = xfs_sb_info[f + 1].offset - 1; | |
1242 | ||
1243 | xfs_trans_log_buf(tp, bp, first, last); | |
1244 | } | |
d210a28c | 1245 | |
d210a28c | 1246 | |
1da177e4 LT |
1247 | /* |
1248 | * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply | |
1249 | * a delta to a specified field in the in-core superblock. Simply | |
1250 | * switch on the field indicated and apply the delta to that field. | |
1251 | * Fields are not allowed to dip below zero, so if the delta would | |
1252 | * do this do not apply it and return EINVAL. | |
1253 | * | |
1254 | * The SB_LOCK must be held when this routine is called. | |
1255 | */ | |
8d280b98 | 1256 | int |
20f4ebf2 DC |
1257 | xfs_mod_incore_sb_unlocked( |
1258 | xfs_mount_t *mp, | |
1259 | xfs_sb_field_t field, | |
1260 | int64_t delta, | |
1261 | int rsvd) | |
1da177e4 LT |
1262 | { |
1263 | int scounter; /* short counter for 32 bit fields */ | |
1264 | long long lcounter; /* long counter for 64 bit fields */ | |
1265 | long long res_used, rem; | |
1266 | ||
1267 | /* | |
1268 | * With the in-core superblock spin lock held, switch | |
1269 | * on the indicated field. Apply the delta to the | |
1270 | * proper field. If the fields value would dip below | |
1271 | * 0, then do not apply the delta and return EINVAL. | |
1272 | */ | |
1273 | switch (field) { | |
1274 | case XFS_SBS_ICOUNT: | |
1275 | lcounter = (long long)mp->m_sb.sb_icount; | |
1276 | lcounter += delta; | |
1277 | if (lcounter < 0) { | |
1278 | ASSERT(0); | |
014c2544 | 1279 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1280 | } |
1281 | mp->m_sb.sb_icount = lcounter; | |
014c2544 | 1282 | return 0; |
1da177e4 LT |
1283 | case XFS_SBS_IFREE: |
1284 | lcounter = (long long)mp->m_sb.sb_ifree; | |
1285 | lcounter += delta; | |
1286 | if (lcounter < 0) { | |
1287 | ASSERT(0); | |
014c2544 | 1288 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1289 | } |
1290 | mp->m_sb.sb_ifree = lcounter; | |
014c2544 | 1291 | return 0; |
1da177e4 | 1292 | case XFS_SBS_FDBLOCKS: |
4be536de DC |
1293 | lcounter = (long long) |
1294 | mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); | |
1da177e4 LT |
1295 | res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); |
1296 | ||
1297 | if (delta > 0) { /* Putting blocks back */ | |
1298 | if (res_used > delta) { | |
1299 | mp->m_resblks_avail += delta; | |
1300 | } else { | |
1301 | rem = delta - res_used; | |
1302 | mp->m_resblks_avail = mp->m_resblks; | |
1303 | lcounter += rem; | |
1304 | } | |
1305 | } else { /* Taking blocks away */ | |
1306 | ||
1307 | lcounter += delta; | |
1308 | ||
1309 | /* | |
1310 | * If were out of blocks, use any available reserved blocks if | |
1311 | * were allowed to. | |
1312 | */ | |
1313 | ||
1314 | if (lcounter < 0) { | |
1315 | if (rsvd) { | |
1316 | lcounter = (long long)mp->m_resblks_avail + delta; | |
1317 | if (lcounter < 0) { | |
014c2544 | 1318 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1319 | } |
1320 | mp->m_resblks_avail = lcounter; | |
014c2544 | 1321 | return 0; |
1da177e4 | 1322 | } else { /* not reserved */ |
014c2544 | 1323 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1324 | } |
1325 | } | |
1326 | } | |
1327 | ||
4be536de | 1328 | mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
014c2544 | 1329 | return 0; |
1da177e4 LT |
1330 | case XFS_SBS_FREXTENTS: |
1331 | lcounter = (long long)mp->m_sb.sb_frextents; | |
1332 | lcounter += delta; | |
1333 | if (lcounter < 0) { | |
014c2544 | 1334 | return XFS_ERROR(ENOSPC); |
1da177e4 LT |
1335 | } |
1336 | mp->m_sb.sb_frextents = lcounter; | |
014c2544 | 1337 | return 0; |
1da177e4 LT |
1338 | case XFS_SBS_DBLOCKS: |
1339 | lcounter = (long long)mp->m_sb.sb_dblocks; | |
1340 | lcounter += delta; | |
1341 | if (lcounter < 0) { | |
1342 | ASSERT(0); | |
014c2544 | 1343 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1344 | } |
1345 | mp->m_sb.sb_dblocks = lcounter; | |
014c2544 | 1346 | return 0; |
1da177e4 LT |
1347 | case XFS_SBS_AGCOUNT: |
1348 | scounter = mp->m_sb.sb_agcount; | |
1349 | scounter += delta; | |
1350 | if (scounter < 0) { | |
1351 | ASSERT(0); | |
014c2544 | 1352 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1353 | } |
1354 | mp->m_sb.sb_agcount = scounter; | |
014c2544 | 1355 | return 0; |
1da177e4 LT |
1356 | case XFS_SBS_IMAX_PCT: |
1357 | scounter = mp->m_sb.sb_imax_pct; | |
1358 | scounter += delta; | |
1359 | if (scounter < 0) { | |
1360 | ASSERT(0); | |
014c2544 | 1361 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1362 | } |
1363 | mp->m_sb.sb_imax_pct = scounter; | |
014c2544 | 1364 | return 0; |
1da177e4 LT |
1365 | case XFS_SBS_REXTSIZE: |
1366 | scounter = mp->m_sb.sb_rextsize; | |
1367 | scounter += delta; | |
1368 | if (scounter < 0) { | |
1369 | ASSERT(0); | |
014c2544 | 1370 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1371 | } |
1372 | mp->m_sb.sb_rextsize = scounter; | |
014c2544 | 1373 | return 0; |
1da177e4 LT |
1374 | case XFS_SBS_RBMBLOCKS: |
1375 | scounter = mp->m_sb.sb_rbmblocks; | |
1376 | scounter += delta; | |
1377 | if (scounter < 0) { | |
1378 | ASSERT(0); | |
014c2544 | 1379 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1380 | } |
1381 | mp->m_sb.sb_rbmblocks = scounter; | |
014c2544 | 1382 | return 0; |
1da177e4 LT |
1383 | case XFS_SBS_RBLOCKS: |
1384 | lcounter = (long long)mp->m_sb.sb_rblocks; | |
1385 | lcounter += delta; | |
1386 | if (lcounter < 0) { | |
1387 | ASSERT(0); | |
014c2544 | 1388 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1389 | } |
1390 | mp->m_sb.sb_rblocks = lcounter; | |
014c2544 | 1391 | return 0; |
1da177e4 LT |
1392 | case XFS_SBS_REXTENTS: |
1393 | lcounter = (long long)mp->m_sb.sb_rextents; | |
1394 | lcounter += delta; | |
1395 | if (lcounter < 0) { | |
1396 | ASSERT(0); | |
014c2544 | 1397 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1398 | } |
1399 | mp->m_sb.sb_rextents = lcounter; | |
014c2544 | 1400 | return 0; |
1da177e4 LT |
1401 | case XFS_SBS_REXTSLOG: |
1402 | scounter = mp->m_sb.sb_rextslog; | |
1403 | scounter += delta; | |
1404 | if (scounter < 0) { | |
1405 | ASSERT(0); | |
014c2544 | 1406 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1407 | } |
1408 | mp->m_sb.sb_rextslog = scounter; | |
014c2544 | 1409 | return 0; |
1da177e4 LT |
1410 | default: |
1411 | ASSERT(0); | |
014c2544 | 1412 | return XFS_ERROR(EINVAL); |
1da177e4 LT |
1413 | } |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * xfs_mod_incore_sb() is used to change a field in the in-core | |
1418 | * superblock structure by the specified delta. This modification | |
1419 | * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked() | |
1420 | * routine to do the work. | |
1421 | */ | |
1422 | int | |
20f4ebf2 DC |
1423 | xfs_mod_incore_sb( |
1424 | xfs_mount_t *mp, | |
1425 | xfs_sb_field_t field, | |
1426 | int64_t delta, | |
1427 | int rsvd) | |
1da177e4 LT |
1428 | { |
1429 | unsigned long s; | |
1430 | int status; | |
1431 | ||
8d280b98 DC |
1432 | /* check for per-cpu counters */ |
1433 | switch (field) { | |
1434 | #ifdef HAVE_PERCPU_SB | |
1435 | case XFS_SBS_ICOUNT: | |
1436 | case XFS_SBS_IFREE: | |
1437 | case XFS_SBS_FDBLOCKS: | |
1438 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
1439 | status = xfs_icsb_modify_counters(mp, field, | |
1440 | delta, rsvd); | |
1441 | break; | |
1442 | } | |
1443 | /* FALLTHROUGH */ | |
1444 | #endif | |
1445 | default: | |
1446 | s = XFS_SB_LOCK(mp); | |
1447 | status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); | |
1448 | XFS_SB_UNLOCK(mp, s); | |
1449 | break; | |
1450 | } | |
1451 | ||
014c2544 | 1452 | return status; |
1da177e4 LT |
1453 | } |
1454 | ||
1455 | /* | |
1456 | * xfs_mod_incore_sb_batch() is used to change more than one field | |
1457 | * in the in-core superblock structure at a time. This modification | |
1458 | * is protected by a lock internal to this module. The fields and | |
1459 | * changes to those fields are specified in the array of xfs_mod_sb | |
1460 | * structures passed in. | |
1461 | * | |
1462 | * Either all of the specified deltas will be applied or none of | |
1463 | * them will. If any modified field dips below 0, then all modifications | |
1464 | * will be backed out and EINVAL will be returned. | |
1465 | */ | |
1466 | int | |
1467 | xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd) | |
1468 | { | |
1469 | unsigned long s; | |
1470 | int status=0; | |
1471 | xfs_mod_sb_t *msbp; | |
1472 | ||
1473 | /* | |
1474 | * Loop through the array of mod structures and apply each | |
1475 | * individually. If any fail, then back out all those | |
1476 | * which have already been applied. Do all of this within | |
1477 | * the scope of the SB_LOCK so that all of the changes will | |
1478 | * be atomic. | |
1479 | */ | |
1480 | s = XFS_SB_LOCK(mp); | |
1481 | msbp = &msb[0]; | |
1482 | for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) { | |
1483 | /* | |
1484 | * Apply the delta at index n. If it fails, break | |
1485 | * from the loop so we'll fall into the undo loop | |
1486 | * below. | |
1487 | */ | |
8d280b98 DC |
1488 | switch (msbp->msb_field) { |
1489 | #ifdef HAVE_PERCPU_SB | |
1490 | case XFS_SBS_ICOUNT: | |
1491 | case XFS_SBS_IFREE: | |
1492 | case XFS_SBS_FDBLOCKS: | |
1493 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
20b64285 DC |
1494 | XFS_SB_UNLOCK(mp, s); |
1495 | status = xfs_icsb_modify_counters(mp, | |
8d280b98 DC |
1496 | msbp->msb_field, |
1497 | msbp->msb_delta, rsvd); | |
20b64285 | 1498 | s = XFS_SB_LOCK(mp); |
8d280b98 DC |
1499 | break; |
1500 | } | |
1501 | /* FALLTHROUGH */ | |
1502 | #endif | |
1503 | default: | |
1504 | status = xfs_mod_incore_sb_unlocked(mp, | |
1505 | msbp->msb_field, | |
1506 | msbp->msb_delta, rsvd); | |
1507 | break; | |
1508 | } | |
1509 | ||
1da177e4 LT |
1510 | if (status != 0) { |
1511 | break; | |
1512 | } | |
1513 | } | |
1514 | ||
1515 | /* | |
1516 | * If we didn't complete the loop above, then back out | |
1517 | * any changes made to the superblock. If you add code | |
1518 | * between the loop above and here, make sure that you | |
1519 | * preserve the value of status. Loop back until | |
1520 | * we step below the beginning of the array. Make sure | |
1521 | * we don't touch anything back there. | |
1522 | */ | |
1523 | if (status != 0) { | |
1524 | msbp--; | |
1525 | while (msbp >= msb) { | |
8d280b98 DC |
1526 | switch (msbp->msb_field) { |
1527 | #ifdef HAVE_PERCPU_SB | |
1528 | case XFS_SBS_ICOUNT: | |
1529 | case XFS_SBS_IFREE: | |
1530 | case XFS_SBS_FDBLOCKS: | |
1531 | if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) { | |
20b64285 DC |
1532 | XFS_SB_UNLOCK(mp, s); |
1533 | status = xfs_icsb_modify_counters(mp, | |
8d280b98 DC |
1534 | msbp->msb_field, |
1535 | -(msbp->msb_delta), | |
1536 | rsvd); | |
20b64285 | 1537 | s = XFS_SB_LOCK(mp); |
8d280b98 DC |
1538 | break; |
1539 | } | |
1540 | /* FALLTHROUGH */ | |
1541 | #endif | |
1542 | default: | |
1543 | status = xfs_mod_incore_sb_unlocked(mp, | |
1544 | msbp->msb_field, | |
1545 | -(msbp->msb_delta), | |
1546 | rsvd); | |
1547 | break; | |
1548 | } | |
1da177e4 LT |
1549 | ASSERT(status == 0); |
1550 | msbp--; | |
1551 | } | |
1552 | } | |
1553 | XFS_SB_UNLOCK(mp, s); | |
014c2544 | 1554 | return status; |
1da177e4 LT |
1555 | } |
1556 | ||
1557 | /* | |
1558 | * xfs_getsb() is called to obtain the buffer for the superblock. | |
1559 | * The buffer is returned locked and read in from disk. | |
1560 | * The buffer should be released with a call to xfs_brelse(). | |
1561 | * | |
1562 | * If the flags parameter is BUF_TRYLOCK, then we'll only return | |
1563 | * the superblock buffer if it can be locked without sleeping. | |
1564 | * If it can't then we'll return NULL. | |
1565 | */ | |
1566 | xfs_buf_t * | |
1567 | xfs_getsb( | |
1568 | xfs_mount_t *mp, | |
1569 | int flags) | |
1570 | { | |
1571 | xfs_buf_t *bp; | |
1572 | ||
1573 | ASSERT(mp->m_sb_bp != NULL); | |
1574 | bp = mp->m_sb_bp; | |
1575 | if (flags & XFS_BUF_TRYLOCK) { | |
1576 | if (!XFS_BUF_CPSEMA(bp)) { | |
1577 | return NULL; | |
1578 | } | |
1579 | } else { | |
1580 | XFS_BUF_PSEMA(bp, PRIBIO); | |
1581 | } | |
1582 | XFS_BUF_HOLD(bp); | |
1583 | ASSERT(XFS_BUF_ISDONE(bp)); | |
014c2544 | 1584 | return bp; |
1da177e4 LT |
1585 | } |
1586 | ||
1587 | /* | |
1588 | * Used to free the superblock along various error paths. | |
1589 | */ | |
1590 | void | |
1591 | xfs_freesb( | |
1592 | xfs_mount_t *mp) | |
1593 | { | |
1594 | xfs_buf_t *bp; | |
1595 | ||
1596 | /* | |
1597 | * Use xfs_getsb() so that the buffer will be locked | |
1598 | * when we call xfs_buf_relse(). | |
1599 | */ | |
1600 | bp = xfs_getsb(mp, 0); | |
1601 | XFS_BUF_UNMANAGE(bp); | |
1602 | xfs_buf_relse(bp); | |
1603 | mp->m_sb_bp = NULL; | |
1604 | } | |
1605 | ||
1606 | /* | |
1607 | * See if the UUID is unique among mounted XFS filesystems. | |
1608 | * Mount fails if UUID is nil or a FS with the same UUID is already mounted. | |
1609 | */ | |
1610 | STATIC int | |
1611 | xfs_uuid_mount( | |
1612 | xfs_mount_t *mp) | |
1613 | { | |
1614 | if (uuid_is_nil(&mp->m_sb.sb_uuid)) { | |
1615 | cmn_err(CE_WARN, | |
1616 | "XFS: Filesystem %s has nil UUID - can't mount", | |
1617 | mp->m_fsname); | |
1618 | return -1; | |
1619 | } | |
1620 | if (!uuid_table_insert(&mp->m_sb.sb_uuid)) { | |
1621 | cmn_err(CE_WARN, | |
1622 | "XFS: Filesystem %s has duplicate UUID - can't mount", | |
1623 | mp->m_fsname); | |
1624 | return -1; | |
1625 | } | |
1626 | return 0; | |
1627 | } | |
1628 | ||
1629 | /* | |
1630 | * Remove filesystem from the UUID table. | |
1631 | */ | |
1632 | STATIC void | |
1633 | xfs_uuid_unmount( | |
1634 | xfs_mount_t *mp) | |
1635 | { | |
1636 | uuid_table_remove(&mp->m_sb.sb_uuid); | |
1637 | } | |
1638 | ||
1639 | /* | |
1640 | * Used to log changes to the superblock unit and width fields which could | |
1641 | * be altered by the mount options. Only the first superblock is updated. | |
1642 | */ | |
1643 | STATIC void | |
1644 | xfs_mount_log_sbunit( | |
1645 | xfs_mount_t *mp, | |
1646 | __int64_t fields) | |
1647 | { | |
1648 | xfs_trans_t *tp; | |
1649 | ||
1650 | ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID)); | |
1651 | ||
1652 | tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); | |
1653 | if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, | |
1654 | XFS_DEFAULT_LOG_COUNT)) { | |
1655 | xfs_trans_cancel(tp, 0); | |
1656 | return; | |
1657 | } | |
1658 | xfs_mod_sb(tp, fields); | |
1659 | xfs_trans_commit(tp, 0, NULL); | |
1660 | } | |
8d280b98 DC |
1661 | |
1662 | ||
1663 | #ifdef HAVE_PERCPU_SB | |
1664 | /* | |
1665 | * Per-cpu incore superblock counters | |
1666 | * | |
1667 | * Simple concept, difficult implementation | |
1668 | * | |
1669 | * Basically, replace the incore superblock counters with a distributed per cpu | |
1670 | * counter for contended fields (e.g. free block count). | |
1671 | * | |
1672 | * Difficulties arise in that the incore sb is used for ENOSPC checking, and | |
1673 | * hence needs to be accurately read when we are running low on space. Hence | |
1674 | * there is a method to enable and disable the per-cpu counters based on how | |
1675 | * much "stuff" is available in them. | |
1676 | * | |
1677 | * Basically, a counter is enabled if there is enough free resource to justify | |
1678 | * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local | |
1679 | * ENOSPC), then we disable the counters to synchronise all callers and | |
1680 | * re-distribute the available resources. | |
1681 | * | |
1682 | * If, once we redistributed the available resources, we still get a failure, | |
1683 | * we disable the per-cpu counter and go through the slow path. | |
1684 | * | |
1685 | * The slow path is the current xfs_mod_incore_sb() function. This means that | |
1686 | * when we disable a per-cpu counter, we need to drain it's resources back to | |
1687 | * the global superblock. We do this after disabling the counter to prevent | |
1688 | * more threads from queueing up on the counter. | |
1689 | * | |
1690 | * Essentially, this means that we still need a lock in the fast path to enable | |
1691 | * synchronisation between the global counters and the per-cpu counters. This | |
1692 | * is not a problem because the lock will be local to a CPU almost all the time | |
1693 | * and have little contention except when we get to ENOSPC conditions. | |
1694 | * | |
1695 | * Basically, this lock becomes a barrier that enables us to lock out the fast | |
1696 | * path while we do things like enabling and disabling counters and | |
1697 | * synchronising the counters. | |
1698 | * | |
1699 | * Locking rules: | |
1700 | * | |
1701 | * 1. XFS_SB_LOCK() before picking up per-cpu locks | |
1702 | * 2. per-cpu locks always picked up via for_each_online_cpu() order | |
1703 | * 3. accurate counter sync requires XFS_SB_LOCK + per cpu locks | |
1704 | * 4. modifying per-cpu counters requires holding per-cpu lock | |
1705 | * 5. modifying global counters requires holding XFS_SB_LOCK | |
1706 | * 6. enabling or disabling a counter requires holding the XFS_SB_LOCK | |
1707 | * and _none_ of the per-cpu locks. | |
1708 | * | |
1709 | * Disabled counters are only ever re-enabled by a balance operation | |
1710 | * that results in more free resources per CPU than a given threshold. | |
1711 | * To ensure counters don't remain disabled, they are rebalanced when | |
1712 | * the global resource goes above a higher threshold (i.e. some hysteresis | |
1713 | * is present to prevent thrashing). | |
e8234a68 DC |
1714 | */ |
1715 | ||
5a67e4c5 | 1716 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1717 | /* |
1718 | * hot-plug CPU notifier support. | |
8d280b98 | 1719 | * |
5a67e4c5 CS |
1720 | * We need a notifier per filesystem as we need to be able to identify |
1721 | * the filesystem to balance the counters out. This is achieved by | |
1722 | * having a notifier block embedded in the xfs_mount_t and doing pointer | |
1723 | * magic to get the mount pointer from the notifier block address. | |
8d280b98 | 1724 | */ |
e8234a68 DC |
1725 | STATIC int |
1726 | xfs_icsb_cpu_notify( | |
1727 | struct notifier_block *nfb, | |
1728 | unsigned long action, | |
1729 | void *hcpu) | |
1730 | { | |
1731 | xfs_icsb_cnts_t *cntp; | |
1732 | xfs_mount_t *mp; | |
1733 | int s; | |
1734 | ||
1735 | mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); | |
1736 | cntp = (xfs_icsb_cnts_t *) | |
1737 | per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); | |
1738 | switch (action) { | |
1739 | case CPU_UP_PREPARE: | |
1740 | /* Easy Case - initialize the area and locks, and | |
1741 | * then rebalance when online does everything else for us. */ | |
01e1b69c | 1742 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 DC |
1743 | break; |
1744 | case CPU_ONLINE: | |
03135cf7 | 1745 | xfs_icsb_lock(mp); |
20b64285 DC |
1746 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0, 0); |
1747 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0, 0); | |
1748 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0, 0); | |
03135cf7 | 1749 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1750 | break; |
1751 | case CPU_DEAD: | |
1752 | /* Disable all the counters, then fold the dead cpu's | |
1753 | * count into the total on the global superblock and | |
1754 | * re-enable the counters. */ | |
03135cf7 | 1755 | xfs_icsb_lock(mp); |
e8234a68 DC |
1756 | s = XFS_SB_LOCK(mp); |
1757 | xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); | |
1758 | xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); | |
1759 | xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); | |
1760 | ||
1761 | mp->m_sb.sb_icount += cntp->icsb_icount; | |
1762 | mp->m_sb.sb_ifree += cntp->icsb_ifree; | |
1763 | mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; | |
1764 | ||
01e1b69c | 1765 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
e8234a68 | 1766 | |
20b64285 DC |
1767 | xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, |
1768 | XFS_ICSB_SB_LOCKED, 0); | |
1769 | xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, | |
1770 | XFS_ICSB_SB_LOCKED, 0); | |
1771 | xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, | |
1772 | XFS_ICSB_SB_LOCKED, 0); | |
e8234a68 | 1773 | XFS_SB_UNLOCK(mp, s); |
03135cf7 | 1774 | xfs_icsb_unlock(mp); |
e8234a68 DC |
1775 | break; |
1776 | } | |
1777 | ||
1778 | return NOTIFY_OK; | |
1779 | } | |
5a67e4c5 | 1780 | #endif /* CONFIG_HOTPLUG_CPU */ |
e8234a68 | 1781 | |
8d280b98 DC |
1782 | int |
1783 | xfs_icsb_init_counters( | |
1784 | xfs_mount_t *mp) | |
1785 | { | |
1786 | xfs_icsb_cnts_t *cntp; | |
1787 | int i; | |
1788 | ||
1789 | mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); | |
1790 | if (mp->m_sb_cnts == NULL) | |
1791 | return -ENOMEM; | |
1792 | ||
5a67e4c5 | 1793 | #ifdef CONFIG_HOTPLUG_CPU |
e8234a68 DC |
1794 | mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; |
1795 | mp->m_icsb_notifier.priority = 0; | |
5a67e4c5 CS |
1796 | register_hotcpu_notifier(&mp->m_icsb_notifier); |
1797 | #endif /* CONFIG_HOTPLUG_CPU */ | |
e8234a68 | 1798 | |
8d280b98 DC |
1799 | for_each_online_cpu(i) { |
1800 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1801 | memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); |
8d280b98 | 1802 | } |
20b64285 DC |
1803 | |
1804 | mutex_init(&mp->m_icsb_mutex); | |
1805 | ||
8d280b98 DC |
1806 | /* |
1807 | * start with all counters disabled so that the | |
1808 | * initial balance kicks us off correctly | |
1809 | */ | |
1810 | mp->m_icsb_counters = -1; | |
1811 | return 0; | |
1812 | } | |
1813 | ||
1814 | STATIC void | |
1815 | xfs_icsb_destroy_counters( | |
1816 | xfs_mount_t *mp) | |
1817 | { | |
e8234a68 | 1818 | if (mp->m_sb_cnts) { |
5a67e4c5 | 1819 | unregister_hotcpu_notifier(&mp->m_icsb_notifier); |
8d280b98 | 1820 | free_percpu(mp->m_sb_cnts); |
e8234a68 | 1821 | } |
03135cf7 | 1822 | mutex_destroy(&mp->m_icsb_mutex); |
8d280b98 DC |
1823 | } |
1824 | ||
7989cb8e | 1825 | STATIC_INLINE void |
01e1b69c DC |
1826 | xfs_icsb_lock_cntr( |
1827 | xfs_icsb_cnts_t *icsbp) | |
1828 | { | |
1829 | while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { | |
1830 | ndelay(1000); | |
1831 | } | |
1832 | } | |
1833 | ||
7989cb8e | 1834 | STATIC_INLINE void |
01e1b69c DC |
1835 | xfs_icsb_unlock_cntr( |
1836 | xfs_icsb_cnts_t *icsbp) | |
1837 | { | |
1838 | clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); | |
1839 | } | |
1840 | ||
8d280b98 | 1841 | |
7989cb8e | 1842 | STATIC_INLINE void |
8d280b98 DC |
1843 | xfs_icsb_lock_all_counters( |
1844 | xfs_mount_t *mp) | |
1845 | { | |
1846 | xfs_icsb_cnts_t *cntp; | |
1847 | int i; | |
1848 | ||
1849 | for_each_online_cpu(i) { | |
1850 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1851 | xfs_icsb_lock_cntr(cntp); |
8d280b98 DC |
1852 | } |
1853 | } | |
1854 | ||
7989cb8e | 1855 | STATIC_INLINE void |
8d280b98 DC |
1856 | xfs_icsb_unlock_all_counters( |
1857 | xfs_mount_t *mp) | |
1858 | { | |
1859 | xfs_icsb_cnts_t *cntp; | |
1860 | int i; | |
1861 | ||
1862 | for_each_online_cpu(i) { | |
1863 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
01e1b69c | 1864 | xfs_icsb_unlock_cntr(cntp); |
8d280b98 DC |
1865 | } |
1866 | } | |
1867 | ||
1868 | STATIC void | |
1869 | xfs_icsb_count( | |
1870 | xfs_mount_t *mp, | |
1871 | xfs_icsb_cnts_t *cnt, | |
1872 | int flags) | |
1873 | { | |
1874 | xfs_icsb_cnts_t *cntp; | |
1875 | int i; | |
1876 | ||
1877 | memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); | |
1878 | ||
1879 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
1880 | xfs_icsb_lock_all_counters(mp); | |
1881 | ||
1882 | for_each_online_cpu(i) { | |
1883 | cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); | |
1884 | cnt->icsb_icount += cntp->icsb_icount; | |
1885 | cnt->icsb_ifree += cntp->icsb_ifree; | |
1886 | cnt->icsb_fdblocks += cntp->icsb_fdblocks; | |
1887 | } | |
1888 | ||
1889 | if (!(flags & XFS_ICSB_LAZY_COUNT)) | |
1890 | xfs_icsb_unlock_all_counters(mp); | |
1891 | } | |
1892 | ||
1893 | STATIC int | |
1894 | xfs_icsb_counter_disabled( | |
1895 | xfs_mount_t *mp, | |
1896 | xfs_sb_field_t field) | |
1897 | { | |
1898 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
1899 | return test_bit(field, &mp->m_icsb_counters); | |
1900 | } | |
1901 | ||
1902 | STATIC int | |
1903 | xfs_icsb_disable_counter( | |
1904 | xfs_mount_t *mp, | |
1905 | xfs_sb_field_t field) | |
1906 | { | |
1907 | xfs_icsb_cnts_t cnt; | |
1908 | ||
1909 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
1910 | ||
20b64285 DC |
1911 | /* |
1912 | * If we are already disabled, then there is nothing to do | |
1913 | * here. We check before locking all the counters to avoid | |
1914 | * the expensive lock operation when being called in the | |
1915 | * slow path and the counter is already disabled. This is | |
1916 | * safe because the only time we set or clear this state is under | |
1917 | * the m_icsb_mutex. | |
1918 | */ | |
1919 | if (xfs_icsb_counter_disabled(mp, field)) | |
1920 | return 0; | |
1921 | ||
8d280b98 DC |
1922 | xfs_icsb_lock_all_counters(mp); |
1923 | if (!test_and_set_bit(field, &mp->m_icsb_counters)) { | |
1924 | /* drain back to superblock */ | |
1925 | ||
1926 | xfs_icsb_count(mp, &cnt, XFS_ICSB_SB_LOCKED|XFS_ICSB_LAZY_COUNT); | |
1927 | switch(field) { | |
1928 | case XFS_SBS_ICOUNT: | |
1929 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
1930 | break; | |
1931 | case XFS_SBS_IFREE: | |
1932 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
1933 | break; | |
1934 | case XFS_SBS_FDBLOCKS: | |
1935 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
1936 | break; | |
1937 | default: | |
1938 | BUG(); | |
1939 | } | |
1940 | } | |
1941 | ||
1942 | xfs_icsb_unlock_all_counters(mp); | |
1943 | ||
1944 | return 0; | |
1945 | } | |
1946 | ||
1947 | STATIC void | |
1948 | xfs_icsb_enable_counter( | |
1949 | xfs_mount_t *mp, | |
1950 | xfs_sb_field_t field, | |
1951 | uint64_t count, | |
1952 | uint64_t resid) | |
1953 | { | |
1954 | xfs_icsb_cnts_t *cntp; | |
1955 | int i; | |
1956 | ||
1957 | ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); | |
1958 | ||
1959 | xfs_icsb_lock_all_counters(mp); | |
1960 | for_each_online_cpu(i) { | |
1961 | cntp = per_cpu_ptr(mp->m_sb_cnts, i); | |
1962 | switch (field) { | |
1963 | case XFS_SBS_ICOUNT: | |
1964 | cntp->icsb_icount = count + resid; | |
1965 | break; | |
1966 | case XFS_SBS_IFREE: | |
1967 | cntp->icsb_ifree = count + resid; | |
1968 | break; | |
1969 | case XFS_SBS_FDBLOCKS: | |
1970 | cntp->icsb_fdblocks = count + resid; | |
1971 | break; | |
1972 | default: | |
1973 | BUG(); | |
1974 | break; | |
1975 | } | |
1976 | resid = 0; | |
1977 | } | |
1978 | clear_bit(field, &mp->m_icsb_counters); | |
1979 | xfs_icsb_unlock_all_counters(mp); | |
1980 | } | |
1981 | ||
1982 | STATIC void | |
1983 | xfs_icsb_sync_counters_int( | |
1984 | xfs_mount_t *mp, | |
1985 | int flags) | |
1986 | { | |
1987 | xfs_icsb_cnts_t cnt; | |
1988 | int s; | |
1989 | ||
1990 | /* Pass 1: lock all counters */ | |
1991 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
1992 | s = XFS_SB_LOCK(mp); | |
1993 | ||
1994 | xfs_icsb_count(mp, &cnt, flags); | |
1995 | ||
1996 | /* Step 3: update mp->m_sb fields */ | |
1997 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) | |
1998 | mp->m_sb.sb_icount = cnt.icsb_icount; | |
1999 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) | |
2000 | mp->m_sb.sb_ifree = cnt.icsb_ifree; | |
2001 | if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) | |
2002 | mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; | |
2003 | ||
2004 | if ((flags & XFS_ICSB_SB_LOCKED) == 0) | |
2005 | XFS_SB_UNLOCK(mp, s); | |
2006 | } | |
2007 | ||
2008 | /* | |
2009 | * Accurate update of per-cpu counters to incore superblock | |
2010 | */ | |
2011 | STATIC void | |
2012 | xfs_icsb_sync_counters( | |
2013 | xfs_mount_t *mp) | |
2014 | { | |
2015 | xfs_icsb_sync_counters_int(mp, 0); | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * lazy addition used for things like df, background sb syncs, etc | |
2020 | */ | |
2021 | void | |
2022 | xfs_icsb_sync_counters_lazy( | |
2023 | xfs_mount_t *mp) | |
2024 | { | |
2025 | xfs_icsb_sync_counters_int(mp, XFS_ICSB_LAZY_COUNT); | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * Balance and enable/disable counters as necessary. | |
2030 | * | |
20b64285 DC |
2031 | * Thresholds for re-enabling counters are somewhat magic. inode counts are |
2032 | * chosen to be the same number as single on disk allocation chunk per CPU, and | |
2033 | * free blocks is something far enough zero that we aren't going thrash when we | |
2034 | * get near ENOSPC. We also need to supply a minimum we require per cpu to | |
2035 | * prevent looping endlessly when xfs_alloc_space asks for more than will | |
2036 | * be distributed to a single CPU but each CPU has enough blocks to be | |
2037 | * reenabled. | |
2038 | * | |
2039 | * Note that we can be called when counters are already disabled. | |
2040 | * xfs_icsb_disable_counter() optimises the counter locking in this case to | |
2041 | * prevent locking every per-cpu counter needlessly. | |
8d280b98 | 2042 | */ |
20b64285 DC |
2043 | |
2044 | #define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 | |
4be536de | 2045 | #define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ |
20b64285 | 2046 | (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) |
8d280b98 DC |
2047 | STATIC void |
2048 | xfs_icsb_balance_counter( | |
2049 | xfs_mount_t *mp, | |
2050 | xfs_sb_field_t field, | |
20b64285 DC |
2051 | int flags, |
2052 | int min_per_cpu) | |
8d280b98 | 2053 | { |
6fdf8ccc | 2054 | uint64_t count, resid; |
8d280b98 DC |
2055 | int weight = num_online_cpus(); |
2056 | int s; | |
20b64285 | 2057 | uint64_t min = (uint64_t)min_per_cpu; |
8d280b98 DC |
2058 | |
2059 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
2060 | s = XFS_SB_LOCK(mp); | |
2061 | ||
2062 | /* disable counter and sync counter */ | |
2063 | xfs_icsb_disable_counter(mp, field); | |
2064 | ||
2065 | /* update counters - first CPU gets residual*/ | |
2066 | switch (field) { | |
2067 | case XFS_SBS_ICOUNT: | |
2068 | count = mp->m_sb.sb_icount; | |
2069 | resid = do_div(count, weight); | |
20b64285 | 2070 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2071 | goto out; |
2072 | break; | |
2073 | case XFS_SBS_IFREE: | |
2074 | count = mp->m_sb.sb_ifree; | |
2075 | resid = do_div(count, weight); | |
20b64285 | 2076 | if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) |
8d280b98 DC |
2077 | goto out; |
2078 | break; | |
2079 | case XFS_SBS_FDBLOCKS: | |
2080 | count = mp->m_sb.sb_fdblocks; | |
2081 | resid = do_div(count, weight); | |
20b64285 | 2082 | if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) |
8d280b98 DC |
2083 | goto out; |
2084 | break; | |
2085 | default: | |
2086 | BUG(); | |
6fdf8ccc | 2087 | count = resid = 0; /* quiet, gcc */ |
8d280b98 DC |
2088 | break; |
2089 | } | |
2090 | ||
2091 | xfs_icsb_enable_counter(mp, field, count, resid); | |
2092 | out: | |
2093 | if (!(flags & XFS_ICSB_SB_LOCKED)) | |
2094 | XFS_SB_UNLOCK(mp, s); | |
2095 | } | |
2096 | ||
20b64285 DC |
2097 | int |
2098 | xfs_icsb_modify_counters( | |
8d280b98 DC |
2099 | xfs_mount_t *mp, |
2100 | xfs_sb_field_t field, | |
20f4ebf2 | 2101 | int64_t delta, |
20b64285 | 2102 | int rsvd) |
8d280b98 DC |
2103 | { |
2104 | xfs_icsb_cnts_t *icsbp; | |
2105 | long long lcounter; /* long counter for 64 bit fields */ | |
20b64285 | 2106 | int cpu, ret = 0, s; |
8d280b98 | 2107 | |
20b64285 | 2108 | might_sleep(); |
8d280b98 DC |
2109 | again: |
2110 | cpu = get_cpu(); | |
20b64285 DC |
2111 | icsbp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, cpu); |
2112 | ||
2113 | /* | |
2114 | * if the counter is disabled, go to slow path | |
2115 | */ | |
8d280b98 DC |
2116 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) |
2117 | goto slow_path; | |
20b64285 DC |
2118 | xfs_icsb_lock_cntr(icsbp); |
2119 | if (unlikely(xfs_icsb_counter_disabled(mp, field))) { | |
2120 | xfs_icsb_unlock_cntr(icsbp); | |
2121 | goto slow_path; | |
2122 | } | |
8d280b98 DC |
2123 | |
2124 | switch (field) { | |
2125 | case XFS_SBS_ICOUNT: | |
2126 | lcounter = icsbp->icsb_icount; | |
2127 | lcounter += delta; | |
2128 | if (unlikely(lcounter < 0)) | |
20b64285 | 2129 | goto balance_counter; |
8d280b98 DC |
2130 | icsbp->icsb_icount = lcounter; |
2131 | break; | |
2132 | ||
2133 | case XFS_SBS_IFREE: | |
2134 | lcounter = icsbp->icsb_ifree; | |
2135 | lcounter += delta; | |
2136 | if (unlikely(lcounter < 0)) | |
20b64285 | 2137 | goto balance_counter; |
8d280b98 DC |
2138 | icsbp->icsb_ifree = lcounter; |
2139 | break; | |
2140 | ||
2141 | case XFS_SBS_FDBLOCKS: | |
2142 | BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); | |
2143 | ||
4be536de | 2144 | lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2145 | lcounter += delta; |
2146 | if (unlikely(lcounter < 0)) | |
20b64285 | 2147 | goto balance_counter; |
4be536de | 2148 | icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); |
8d280b98 DC |
2149 | break; |
2150 | default: | |
2151 | BUG(); | |
2152 | break; | |
2153 | } | |
01e1b69c | 2154 | xfs_icsb_unlock_cntr(icsbp); |
8d280b98 | 2155 | put_cpu(); |
8d280b98 DC |
2156 | return 0; |
2157 | ||
8d280b98 | 2158 | slow_path: |
8d280b98 DC |
2159 | put_cpu(); |
2160 | ||
20b64285 DC |
2161 | /* |
2162 | * serialise with a mutex so we don't burn lots of cpu on | |
2163 | * the superblock lock. We still need to hold the superblock | |
2164 | * lock, however, when we modify the global structures. | |
2165 | */ | |
03135cf7 | 2166 | xfs_icsb_lock(mp); |
20b64285 DC |
2167 | |
2168 | /* | |
2169 | * Now running atomically. | |
2170 | * | |
2171 | * If the counter is enabled, someone has beaten us to rebalancing. | |
2172 | * Drop the lock and try again in the fast path.... | |
2173 | */ | |
2174 | if (!(xfs_icsb_counter_disabled(mp, field))) { | |
03135cf7 | 2175 | xfs_icsb_unlock(mp); |
8d280b98 | 2176 | goto again; |
8d280b98 DC |
2177 | } |
2178 | ||
20b64285 DC |
2179 | /* |
2180 | * The counter is currently disabled. Because we are | |
2181 | * running atomically here, we know a rebalance cannot | |
2182 | * be in progress. Hence we can go straight to operating | |
2183 | * on the global superblock. We do not call xfs_mod_incore_sb() | |
2184 | * here even though we need to get the SB_LOCK. Doing so | |
2185 | * will cause us to re-enter this function and deadlock. | |
2186 | * Hence we get the SB_LOCK ourselves and then call | |
2187 | * xfs_mod_incore_sb_unlocked() as the unlocked path operates | |
2188 | * directly on the global counters. | |
2189 | */ | |
2190 | s = XFS_SB_LOCK(mp); | |
8d280b98 | 2191 | ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); |
20b64285 | 2192 | XFS_SB_UNLOCK(mp, s); |
8d280b98 | 2193 | |
20b64285 DC |
2194 | /* |
2195 | * Now that we've modified the global superblock, we | |
2196 | * may be able to re-enable the distributed counters | |
2197 | * (e.g. lots of space just got freed). After that | |
2198 | * we are done. | |
2199 | */ | |
2200 | if (ret != ENOSPC) | |
2201 | xfs_icsb_balance_counter(mp, field, 0, 0); | |
03135cf7 | 2202 | xfs_icsb_unlock(mp); |
8d280b98 | 2203 | return ret; |
8d280b98 | 2204 | |
20b64285 DC |
2205 | balance_counter: |
2206 | xfs_icsb_unlock_cntr(icsbp); | |
2207 | put_cpu(); | |
8d280b98 | 2208 | |
20b64285 DC |
2209 | /* |
2210 | * We may have multiple threads here if multiple per-cpu | |
2211 | * counters run dry at the same time. This will mean we can | |
2212 | * do more balances than strictly necessary but it is not | |
2213 | * the common slowpath case. | |
2214 | */ | |
03135cf7 | 2215 | xfs_icsb_lock(mp); |
20b64285 DC |
2216 | |
2217 | /* | |
2218 | * running atomically. | |
2219 | * | |
2220 | * This will leave the counter in the correct state for future | |
2221 | * accesses. After the rebalance, we simply try again and our retry | |
2222 | * will either succeed through the fast path or slow path without | |
2223 | * another balance operation being required. | |
2224 | */ | |
2225 | xfs_icsb_balance_counter(mp, field, 0, delta); | |
03135cf7 | 2226 | xfs_icsb_unlock(mp); |
20b64285 | 2227 | goto again; |
8d280b98 | 2228 | } |
20b64285 | 2229 | |
8d280b98 | 2230 | #endif |