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fe4fa4b8 DC |
1 | /* |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. | |
3 | * All Rights Reserved. | |
4 | * | |
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 | |
7 | * published by the Free Software Foundation. | |
8 | * | |
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. | |
13 | * | |
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 | |
17 | */ | |
18 | #include "xfs.h" | |
19 | #include "xfs_fs.h" | |
20 | #include "xfs_types.h" | |
21 | #include "xfs_bit.h" | |
22 | #include "xfs_log.h" | |
23 | #include "xfs_inum.h" | |
24 | #include "xfs_trans.h" | |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
27 | #include "xfs_dir2.h" | |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
30 | #include "xfs_bmap_btree.h" | |
31 | #include "xfs_alloc_btree.h" | |
32 | #include "xfs_ialloc_btree.h" | |
33 | #include "xfs_btree.h" | |
34 | #include "xfs_dir2_sf.h" | |
35 | #include "xfs_attr_sf.h" | |
36 | #include "xfs_inode.h" | |
37 | #include "xfs_dinode.h" | |
38 | #include "xfs_error.h" | |
39 | #include "xfs_mru_cache.h" | |
40 | #include "xfs_filestream.h" | |
41 | #include "xfs_vnodeops.h" | |
42 | #include "xfs_utils.h" | |
43 | #include "xfs_buf_item.h" | |
44 | #include "xfs_inode_item.h" | |
45 | #include "xfs_rw.h" | |
46 | ||
a167b17e DC |
47 | #include <linux/kthread.h> |
48 | #include <linux/freezer.h> | |
49 | ||
fe4fa4b8 DC |
50 | /* |
51 | * xfs_sync flushes any pending I/O to file system vfsp. | |
52 | * | |
53 | * This routine is called by vfs_sync() to make sure that things make it | |
54 | * out to disk eventually, on sync() system calls to flush out everything, | |
55 | * and when the file system is unmounted. For the vfs_sync() case, all | |
56 | * we really need to do is sync out the log to make all of our meta-data | |
57 | * updates permanent (except for timestamps). For calls from pflushd(), | |
58 | * dirty pages are kept moving by calling pdflush() on the inodes | |
59 | * containing them. We also flush the inodes that we can lock without | |
60 | * sleeping and the superblock if we can lock it without sleeping from | |
61 | * vfs_sync() so that items at the tail of the log are always moving out. | |
62 | * | |
63 | * Flags: | |
64 | * SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want | |
65 | * to sleep if we can help it. All we really need | |
66 | * to do is ensure that the log is synced at least | |
67 | * periodically. We also push the inodes and | |
68 | * superblock if we can lock them without sleeping | |
69 | * and they are not pinned. | |
70 | * SYNC_ATTR - We need to flush the inodes. If SYNC_BDFLUSH is not | |
71 | * set, then we really want to lock each inode and flush | |
72 | * it. | |
73 | * SYNC_WAIT - All the flushes that take place in this call should | |
74 | * be synchronous. | |
75 | * SYNC_DELWRI - This tells us to push dirty pages associated with | |
76 | * inodes. SYNC_WAIT and SYNC_BDFLUSH are used to | |
77 | * determine if they should be flushed sync, async, or | |
78 | * delwri. | |
79 | * SYNC_CLOSE - This flag is passed when the system is being | |
80 | * unmounted. We should sync and invalidate everything. | |
81 | * SYNC_FSDATA - This indicates that the caller would like to make | |
82 | * sure the superblock is safe on disk. We can ensure | |
83 | * this by simply making sure the log gets flushed | |
84 | * if SYNC_BDFLUSH is set, and by actually writing it | |
85 | * out otherwise. | |
86 | * SYNC_IOWAIT - The caller wants us to wait for all data I/O to complete | |
87 | * before we return (including direct I/O). Forms the drain | |
88 | * side of the write barrier needed to safely quiesce the | |
89 | * filesystem. | |
90 | * | |
91 | */ | |
92 | int | |
93 | xfs_sync( | |
94 | xfs_mount_t *mp, | |
95 | int flags) | |
96 | { | |
97 | int error; | |
98 | ||
99 | /* | |
100 | * Get the Quota Manager to flush the dquots. | |
101 | * | |
102 | * If XFS quota support is not enabled or this filesystem | |
103 | * instance does not use quotas XFS_QM_DQSYNC will always | |
104 | * return zero. | |
105 | */ | |
106 | error = XFS_QM_DQSYNC(mp, flags); | |
107 | if (error) { | |
108 | /* | |
109 | * If we got an IO error, we will be shutting down. | |
110 | * So, there's nothing more for us to do here. | |
111 | */ | |
112 | ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp)); | |
113 | if (XFS_FORCED_SHUTDOWN(mp)) | |
114 | return XFS_ERROR(error); | |
115 | } | |
116 | ||
117 | if (flags & SYNC_IOWAIT) | |
118 | xfs_filestream_flush(mp); | |
119 | ||
120 | return xfs_syncsub(mp, flags, NULL); | |
121 | } | |
122 | ||
123 | /* | |
683a8970 DC |
124 | * Sync all the inodes in the given AG according to the |
125 | * direction given by the flags. | |
fe4fa4b8 | 126 | */ |
683a8970 DC |
127 | STATIC int |
128 | xfs_sync_inodes_ag( | |
fe4fa4b8 | 129 | xfs_mount_t *mp, |
683a8970 | 130 | int ag, |
fe4fa4b8 | 131 | int flags, |
683a8970 | 132 | int *bypassed) |
fe4fa4b8 DC |
133 | { |
134 | xfs_inode_t *ip = NULL; | |
135 | struct inode *vp = NULL; | |
683a8970 DC |
136 | xfs_perag_t *pag = &mp->m_perag[ag]; |
137 | boolean_t vnode_refed = B_FALSE; | |
138 | int nr_found; | |
139 | int first_index = 0; | |
140 | int error = 0; | |
141 | int last_error = 0; | |
142 | int fflag = XFS_B_ASYNC; | |
143 | int lock_flags = XFS_ILOCK_SHARED; | |
fe4fa4b8 | 144 | |
fe4fa4b8 DC |
145 | if (flags & SYNC_DELWRI) |
146 | fflag = XFS_B_DELWRI; | |
147 | if (flags & SYNC_WAIT) | |
148 | fflag = 0; /* synchronous overrides all */ | |
149 | ||
fe4fa4b8 DC |
150 | if (flags & (SYNC_DELWRI | SYNC_CLOSE)) { |
151 | /* | |
152 | * We need the I/O lock if we're going to call any of | |
153 | * the flush/inval routines. | |
154 | */ | |
683a8970 | 155 | lock_flags |= XFS_IOLOCK_SHARED; |
fe4fa4b8 DC |
156 | } |
157 | ||
fe4fa4b8 | 158 | do { |
fe4fa4b8 | 159 | /* |
683a8970 DC |
160 | * use a gang lookup to find the next inode in the tree |
161 | * as the tree is sparse and a gang lookup walks to find | |
162 | * the number of objects requested. | |
fe4fa4b8 | 163 | */ |
683a8970 DC |
164 | read_lock(&pag->pag_ici_lock); |
165 | nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, | |
166 | (void**)&ip, first_index, 1); | |
fe4fa4b8 | 167 | |
683a8970 DC |
168 | if (!nr_found) { |
169 | read_unlock(&pag->pag_ici_lock); | |
170 | break; | |
fe4fa4b8 DC |
171 | } |
172 | ||
683a8970 DC |
173 | /* update the index for the next lookup */ |
174 | first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1); | |
fe4fa4b8 DC |
175 | |
176 | /* | |
683a8970 DC |
177 | * skip inodes in reclaim. Let xfs_syncsub do that for |
178 | * us so we don't need to worry. | |
fe4fa4b8 | 179 | */ |
683a8970 DC |
180 | vp = VFS_I(ip); |
181 | if (!vp) { | |
182 | read_unlock(&pag->pag_ici_lock); | |
fe4fa4b8 DC |
183 | continue; |
184 | } | |
185 | ||
683a8970 | 186 | /* bad inodes are dealt with elsewhere */ |
fe4fa4b8 | 187 | if (VN_BAD(vp)) { |
683a8970 | 188 | read_unlock(&pag->pag_ici_lock); |
fe4fa4b8 DC |
189 | continue; |
190 | } | |
191 | ||
683a8970 | 192 | /* nothing to sync during shutdown */ |
fe4fa4b8 | 193 | if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) { |
683a8970 | 194 | read_unlock(&pag->pag_ici_lock); |
fe4fa4b8 DC |
195 | return 0; |
196 | } | |
197 | ||
198 | /* | |
683a8970 DC |
199 | * The inode lock here actually coordinates with the almost |
200 | * spurious inode lock in xfs_ireclaim() to prevent the vnode | |
201 | * we handle here without a reference from being freed while we | |
202 | * reference it. If we lock the inode while it's on the mount | |
203 | * list here, then the spurious inode lock in xfs_ireclaim() | |
204 | * after the inode is pulled from the mount list will sleep | |
205 | * until we release it here. This keeps the vnode from being | |
206 | * freed while we reference it. | |
fe4fa4b8 DC |
207 | */ |
208 | if (xfs_ilock_nowait(ip, lock_flags) == 0) { | |
fe4fa4b8 | 209 | vp = vn_grab(vp); |
683a8970 DC |
210 | read_unlock(&pag->pag_ici_lock); |
211 | if (!vp) | |
fe4fa4b8 | 212 | continue; |
fe4fa4b8 DC |
213 | xfs_ilock(ip, lock_flags); |
214 | ||
215 | ASSERT(vp == VFS_I(ip)); | |
216 | ASSERT(ip->i_mount == mp); | |
217 | ||
218 | vnode_refed = B_TRUE; | |
683a8970 DC |
219 | } else { |
220 | /* safe to unlock here as we have a reference */ | |
221 | read_unlock(&pag->pag_ici_lock); | |
fe4fa4b8 | 222 | } |
fe4fa4b8 DC |
223 | /* |
224 | * If we have to flush data or wait for I/O completion | |
225 | * we need to drop the ilock that we currently hold. | |
226 | * If we need to drop the lock, insert a marker if we | |
227 | * have not already done so. | |
228 | */ | |
683a8970 | 229 | if (flags & SYNC_CLOSE) { |
fe4fa4b8 | 230 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
683a8970 DC |
231 | if (XFS_FORCED_SHUTDOWN(mp)) |
232 | xfs_tosspages(ip, 0, -1, FI_REMAPF); | |
233 | else | |
234 | error = xfs_flushinval_pages(ip, 0, -1, | |
235 | FI_REMAPF); | |
236 | /* wait for I/O on freeze */ | |
fe4fa4b8 DC |
237 | if (flags & SYNC_IOWAIT) |
238 | vn_iowait(ip); | |
239 | ||
240 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
241 | } | |
242 | ||
683a8970 DC |
243 | if ((flags & SYNC_DELWRI) && VN_DIRTY(vp)) { |
244 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
245 | error = xfs_flush_pages(ip, 0, -1, fflag, FI_NONE); | |
246 | if (flags & SYNC_IOWAIT) | |
247 | vn_iowait(ip); | |
248 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
249 | } | |
fe4fa4b8 | 250 | |
683a8970 | 251 | if ((flags & SYNC_ATTR) && !xfs_inode_clean(ip)) { |
fe4fa4b8 DC |
252 | if (flags & SYNC_WAIT) { |
253 | xfs_iflock(ip); | |
683a8970 DC |
254 | if (!xfs_inode_clean(ip)) |
255 | error = xfs_iflush(ip, XFS_IFLUSH_SYNC); | |
256 | else | |
257 | xfs_ifunlock(ip); | |
fe4fa4b8 | 258 | } else if (xfs_iflock_nowait(ip)) { |
683a8970 DC |
259 | if (!xfs_inode_clean(ip)) |
260 | error = xfs_iflush(ip, XFS_IFLUSH_DELWRI); | |
261 | else | |
262 | xfs_ifunlock(ip); | |
fe4fa4b8 DC |
263 | } else if (bypassed) { |
264 | (*bypassed)++; | |
265 | } | |
266 | } | |
267 | ||
683a8970 | 268 | if (lock_flags) |
fe4fa4b8 | 269 | xfs_iunlock(ip, lock_flags); |
fe4fa4b8 DC |
270 | |
271 | if (vnode_refed) { | |
fe4fa4b8 | 272 | IRELE(ip); |
fe4fa4b8 DC |
273 | vnode_refed = B_FALSE; |
274 | } | |
275 | ||
683a8970 | 276 | if (error) |
fe4fa4b8 | 277 | last_error = error; |
fe4fa4b8 DC |
278 | /* |
279 | * bail out if the filesystem is corrupted. | |
280 | */ | |
683a8970 | 281 | if (error == EFSCORRUPTED) |
fe4fa4b8 | 282 | return XFS_ERROR(error); |
fe4fa4b8 | 283 | |
683a8970 | 284 | } while (nr_found); |
fe4fa4b8 | 285 | |
683a8970 DC |
286 | return last_error; |
287 | } | |
fe4fa4b8 | 288 | |
683a8970 DC |
289 | int |
290 | xfs_sync_inodes( | |
291 | xfs_mount_t *mp, | |
292 | int flags, | |
293 | int *bypassed) | |
294 | { | |
295 | int error; | |
296 | int last_error; | |
297 | int i; | |
fe4fa4b8 | 298 | |
683a8970 DC |
299 | if (bypassed) |
300 | *bypassed = 0; | |
301 | if (mp->m_flags & XFS_MOUNT_RDONLY) | |
302 | return 0; | |
303 | error = 0; | |
304 | last_error = 0; | |
fe4fa4b8 | 305 | |
683a8970 DC |
306 | for (i = 0; i < mp->m_sb.sb_agcount; i++) { |
307 | if (!mp->m_perag[i].pag_ici_init) | |
308 | continue; | |
309 | error = xfs_sync_inodes_ag(mp, i, flags, bypassed); | |
310 | if (error) | |
311 | last_error = error; | |
312 | if (error == EFSCORRUPTED) | |
313 | break; | |
314 | } | |
fe4fa4b8 DC |
315 | return XFS_ERROR(last_error); |
316 | } | |
317 | ||
318 | /* | |
319 | * xfs sync routine for internal use | |
320 | * | |
321 | * This routine supports all of the flags defined for the generic vfs_sync | |
322 | * interface as explained above under xfs_sync. | |
323 | * | |
324 | */ | |
325 | int | |
326 | xfs_syncsub( | |
327 | xfs_mount_t *mp, | |
328 | int flags, | |
329 | int *bypassed) | |
330 | { | |
331 | int error = 0; | |
332 | int last_error = 0; | |
333 | uint log_flags = XFS_LOG_FORCE; | |
334 | xfs_buf_t *bp; | |
335 | xfs_buf_log_item_t *bip; | |
336 | ||
337 | /* | |
338 | * Sync out the log. This ensures that the log is periodically | |
339 | * flushed even if there is not enough activity to fill it up. | |
340 | */ | |
341 | if (flags & SYNC_WAIT) | |
342 | log_flags |= XFS_LOG_SYNC; | |
343 | ||
344 | xfs_log_force(mp, (xfs_lsn_t)0, log_flags); | |
345 | ||
346 | if (flags & (SYNC_ATTR|SYNC_DELWRI)) { | |
347 | if (flags & SYNC_BDFLUSH) | |
75c68f41 | 348 | xfs_finish_reclaim_all(mp, 1, XFS_IFLUSH_DELWRI_ELSE_ASYNC); |
fe4fa4b8 DC |
349 | else |
350 | error = xfs_sync_inodes(mp, flags, bypassed); | |
351 | } | |
352 | ||
353 | /* | |
354 | * Flushing out dirty data above probably generated more | |
355 | * log activity, so if this isn't vfs_sync() then flush | |
356 | * the log again. | |
357 | */ | |
358 | if (flags & SYNC_DELWRI) { | |
359 | xfs_log_force(mp, (xfs_lsn_t)0, log_flags); | |
360 | } | |
361 | ||
362 | if (flags & SYNC_FSDATA) { | |
363 | /* | |
364 | * If this is vfs_sync() then only sync the superblock | |
365 | * if we can lock it without sleeping and it is not pinned. | |
366 | */ | |
367 | if (flags & SYNC_BDFLUSH) { | |
368 | bp = xfs_getsb(mp, XFS_BUF_TRYLOCK); | |
369 | if (bp != NULL) { | |
370 | bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*); | |
371 | if ((bip != NULL) && | |
372 | xfs_buf_item_dirty(bip)) { | |
373 | if (!(XFS_BUF_ISPINNED(bp))) { | |
374 | XFS_BUF_ASYNC(bp); | |
375 | error = xfs_bwrite(mp, bp); | |
376 | } else { | |
377 | xfs_buf_relse(bp); | |
378 | } | |
379 | } else { | |
380 | xfs_buf_relse(bp); | |
381 | } | |
382 | } | |
383 | } else { | |
384 | bp = xfs_getsb(mp, 0); | |
385 | /* | |
386 | * If the buffer is pinned then push on the log so | |
387 | * we won't get stuck waiting in the write for | |
388 | * someone, maybe ourselves, to flush the log. | |
389 | * Even though we just pushed the log above, we | |
390 | * did not have the superblock buffer locked at | |
391 | * that point so it can become pinned in between | |
392 | * there and here. | |
393 | */ | |
394 | if (XFS_BUF_ISPINNED(bp)) | |
395 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE); | |
396 | if (flags & SYNC_WAIT) | |
397 | XFS_BUF_UNASYNC(bp); | |
398 | else | |
399 | XFS_BUF_ASYNC(bp); | |
400 | error = xfs_bwrite(mp, bp); | |
401 | } | |
402 | if (error) { | |
403 | last_error = error; | |
404 | } | |
405 | } | |
406 | ||
407 | /* | |
408 | * Now check to see if the log needs a "dummy" transaction. | |
409 | */ | |
410 | if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) { | |
411 | xfs_trans_t *tp; | |
412 | xfs_inode_t *ip; | |
413 | ||
414 | /* | |
415 | * Put a dummy transaction in the log to tell | |
416 | * recovery that all others are OK. | |
417 | */ | |
418 | tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1); | |
419 | if ((error = xfs_trans_reserve(tp, 0, | |
420 | XFS_ICHANGE_LOG_RES(mp), | |
421 | 0, 0, 0))) { | |
422 | xfs_trans_cancel(tp, 0); | |
423 | return error; | |
424 | } | |
425 | ||
426 | ip = mp->m_rootip; | |
427 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
428 | ||
429 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
430 | xfs_trans_ihold(tp, ip); | |
431 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
432 | error = xfs_trans_commit(tp, 0); | |
433 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
434 | xfs_log_force(mp, (xfs_lsn_t)0, log_flags); | |
435 | } | |
436 | ||
437 | /* | |
438 | * When shutting down, we need to insure that the AIL is pushed | |
439 | * to disk or the filesystem can appear corrupt from the PROM. | |
440 | */ | |
441 | if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) { | |
442 | XFS_bflush(mp->m_ddev_targp); | |
443 | if (mp->m_rtdev_targp) { | |
444 | XFS_bflush(mp->m_rtdev_targp); | |
445 | } | |
446 | } | |
447 | ||
448 | return XFS_ERROR(last_error); | |
449 | } | |
a167b17e DC |
450 | |
451 | /* | |
452 | * Enqueue a work item to be picked up by the vfs xfssyncd thread. | |
453 | * Doing this has two advantages: | |
454 | * - It saves on stack space, which is tight in certain situations | |
455 | * - It can be used (with care) as a mechanism to avoid deadlocks. | |
456 | * Flushing while allocating in a full filesystem requires both. | |
457 | */ | |
458 | STATIC void | |
459 | xfs_syncd_queue_work( | |
460 | struct xfs_mount *mp, | |
461 | void *data, | |
462 | void (*syncer)(struct xfs_mount *, void *)) | |
463 | { | |
464 | struct bhv_vfs_sync_work *work; | |
465 | ||
466 | work = kmem_alloc(sizeof(struct bhv_vfs_sync_work), KM_SLEEP); | |
467 | INIT_LIST_HEAD(&work->w_list); | |
468 | work->w_syncer = syncer; | |
469 | work->w_data = data; | |
470 | work->w_mount = mp; | |
471 | spin_lock(&mp->m_sync_lock); | |
472 | list_add_tail(&work->w_list, &mp->m_sync_list); | |
473 | spin_unlock(&mp->m_sync_lock); | |
474 | wake_up_process(mp->m_sync_task); | |
475 | } | |
476 | ||
477 | /* | |
478 | * Flush delayed allocate data, attempting to free up reserved space | |
479 | * from existing allocations. At this point a new allocation attempt | |
480 | * has failed with ENOSPC and we are in the process of scratching our | |
481 | * heads, looking about for more room... | |
482 | */ | |
483 | STATIC void | |
484 | xfs_flush_inode_work( | |
485 | struct xfs_mount *mp, | |
486 | void *arg) | |
487 | { | |
488 | struct inode *inode = arg; | |
489 | filemap_flush(inode->i_mapping); | |
490 | iput(inode); | |
491 | } | |
492 | ||
493 | void | |
494 | xfs_flush_inode( | |
495 | xfs_inode_t *ip) | |
496 | { | |
497 | struct inode *inode = VFS_I(ip); | |
498 | ||
499 | igrab(inode); | |
500 | xfs_syncd_queue_work(ip->i_mount, inode, xfs_flush_inode_work); | |
501 | delay(msecs_to_jiffies(500)); | |
502 | } | |
503 | ||
504 | /* | |
505 | * This is the "bigger hammer" version of xfs_flush_inode_work... | |
506 | * (IOW, "If at first you don't succeed, use a Bigger Hammer"). | |
507 | */ | |
508 | STATIC void | |
509 | xfs_flush_device_work( | |
510 | struct xfs_mount *mp, | |
511 | void *arg) | |
512 | { | |
513 | struct inode *inode = arg; | |
514 | sync_blockdev(mp->m_super->s_bdev); | |
515 | iput(inode); | |
516 | } | |
517 | ||
518 | void | |
519 | xfs_flush_device( | |
520 | xfs_inode_t *ip) | |
521 | { | |
522 | struct inode *inode = VFS_I(ip); | |
523 | ||
524 | igrab(inode); | |
525 | xfs_syncd_queue_work(ip->i_mount, inode, xfs_flush_device_work); | |
526 | delay(msecs_to_jiffies(500)); | |
527 | xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC); | |
528 | } | |
529 | ||
530 | STATIC void | |
531 | xfs_sync_worker( | |
532 | struct xfs_mount *mp, | |
533 | void *unused) | |
534 | { | |
535 | int error; | |
536 | ||
537 | if (!(mp->m_flags & XFS_MOUNT_RDONLY)) | |
538 | error = xfs_sync(mp, SYNC_FSDATA | SYNC_BDFLUSH | SYNC_ATTR); | |
539 | mp->m_sync_seq++; | |
540 | wake_up(&mp->m_wait_single_sync_task); | |
541 | } | |
542 | ||
543 | STATIC int | |
544 | xfssyncd( | |
545 | void *arg) | |
546 | { | |
547 | struct xfs_mount *mp = arg; | |
548 | long timeleft; | |
549 | bhv_vfs_sync_work_t *work, *n; | |
550 | LIST_HEAD (tmp); | |
551 | ||
552 | set_freezable(); | |
553 | timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10); | |
554 | for (;;) { | |
555 | timeleft = schedule_timeout_interruptible(timeleft); | |
556 | /* swsusp */ | |
557 | try_to_freeze(); | |
558 | if (kthread_should_stop() && list_empty(&mp->m_sync_list)) | |
559 | break; | |
560 | ||
561 | spin_lock(&mp->m_sync_lock); | |
562 | /* | |
563 | * We can get woken by laptop mode, to do a sync - | |
564 | * that's the (only!) case where the list would be | |
565 | * empty with time remaining. | |
566 | */ | |
567 | if (!timeleft || list_empty(&mp->m_sync_list)) { | |
568 | if (!timeleft) | |
569 | timeleft = xfs_syncd_centisecs * | |
570 | msecs_to_jiffies(10); | |
571 | INIT_LIST_HEAD(&mp->m_sync_work.w_list); | |
572 | list_add_tail(&mp->m_sync_work.w_list, | |
573 | &mp->m_sync_list); | |
574 | } | |
575 | list_for_each_entry_safe(work, n, &mp->m_sync_list, w_list) | |
576 | list_move(&work->w_list, &tmp); | |
577 | spin_unlock(&mp->m_sync_lock); | |
578 | ||
579 | list_for_each_entry_safe(work, n, &tmp, w_list) { | |
580 | (*work->w_syncer)(mp, work->w_data); | |
581 | list_del(&work->w_list); | |
582 | if (work == &mp->m_sync_work) | |
583 | continue; | |
584 | kmem_free(work); | |
585 | } | |
586 | } | |
587 | ||
588 | return 0; | |
589 | } | |
590 | ||
591 | int | |
592 | xfs_syncd_init( | |
593 | struct xfs_mount *mp) | |
594 | { | |
595 | mp->m_sync_work.w_syncer = xfs_sync_worker; | |
596 | mp->m_sync_work.w_mount = mp; | |
597 | mp->m_sync_task = kthread_run(xfssyncd, mp, "xfssyncd"); | |
598 | if (IS_ERR(mp->m_sync_task)) | |
599 | return -PTR_ERR(mp->m_sync_task); | |
600 | return 0; | |
601 | } | |
602 | ||
603 | void | |
604 | xfs_syncd_stop( | |
605 | struct xfs_mount *mp) | |
606 | { | |
607 | kthread_stop(mp->m_sync_task); | |
608 | } | |
609 |