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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | ||
33 | #include "xfs.h" | |
34 | #include "xfs_macros.h" | |
35 | #include "xfs_types.h" | |
36 | #include "xfs_inum.h" | |
37 | #include "xfs_log.h" | |
38 | #include "xfs_trans.h" | |
39 | #include "xfs_sb.h" | |
40 | #include "xfs_dir.h" | |
41 | #include "xfs_dmapi.h" | |
42 | #include "xfs_mount.h" | |
43 | #include "xfs_trans_priv.h" | |
44 | #include "xfs_error.h" | |
45 | ||
46 | STATIC void xfs_ail_insert(xfs_ail_entry_t *, xfs_log_item_t *); | |
47 | STATIC xfs_log_item_t * xfs_ail_delete(xfs_ail_entry_t *, xfs_log_item_t *); | |
48 | STATIC xfs_log_item_t * xfs_ail_min(xfs_ail_entry_t *); | |
49 | STATIC xfs_log_item_t * xfs_ail_next(xfs_ail_entry_t *, xfs_log_item_t *); | |
50 | ||
51 | #ifdef DEBUG | |
52 | STATIC void xfs_ail_check(xfs_ail_entry_t *); | |
53 | #else | |
54 | #define xfs_ail_check(a) | |
55 | #endif /* DEBUG */ | |
56 | ||
57 | ||
58 | /* | |
59 | * This is called by the log manager code to determine the LSN | |
60 | * of the tail of the log. This is exactly the LSN of the first | |
61 | * item in the AIL. If the AIL is empty, then this function | |
62 | * returns 0. | |
63 | * | |
64 | * We need the AIL lock in order to get a coherent read of the | |
65 | * lsn of the last item in the AIL. | |
66 | */ | |
67 | xfs_lsn_t | |
68 | xfs_trans_tail_ail( | |
69 | xfs_mount_t *mp) | |
70 | { | |
71 | xfs_lsn_t lsn; | |
72 | xfs_log_item_t *lip; | |
73 | SPLDECL(s); | |
74 | ||
75 | AIL_LOCK(mp,s); | |
76 | lip = xfs_ail_min(&(mp->m_ail)); | |
77 | if (lip == NULL) { | |
78 | lsn = (xfs_lsn_t)0; | |
79 | } else { | |
80 | lsn = lip->li_lsn; | |
81 | } | |
82 | AIL_UNLOCK(mp, s); | |
83 | ||
84 | return lsn; | |
85 | } | |
86 | ||
87 | /* | |
88 | * xfs_trans_push_ail | |
89 | * | |
90 | * This routine is called to move the tail of the AIL | |
91 | * forward. It does this by trying to flush items in the AIL | |
92 | * whose lsns are below the given threshold_lsn. | |
93 | * | |
94 | * The routine returns the lsn of the tail of the log. | |
95 | */ | |
96 | xfs_lsn_t | |
97 | xfs_trans_push_ail( | |
98 | xfs_mount_t *mp, | |
99 | xfs_lsn_t threshold_lsn) | |
100 | { | |
101 | xfs_lsn_t lsn; | |
102 | xfs_log_item_t *lip; | |
103 | int gen; | |
104 | int restarts; | |
105 | int lock_result; | |
106 | int flush_log; | |
107 | SPLDECL(s); | |
108 | ||
109 | #define XFS_TRANS_PUSH_AIL_RESTARTS 10 | |
110 | ||
111 | AIL_LOCK(mp,s); | |
112 | lip = xfs_trans_first_ail(mp, &gen); | |
113 | if (lip == NULL || XFS_FORCED_SHUTDOWN(mp)) { | |
114 | /* | |
115 | * Just return if the AIL is empty. | |
116 | */ | |
117 | AIL_UNLOCK(mp, s); | |
118 | return (xfs_lsn_t)0; | |
119 | } | |
120 | ||
121 | XFS_STATS_INC(xs_push_ail); | |
122 | ||
123 | /* | |
124 | * While the item we are looking at is below the given threshold | |
125 | * try to flush it out. Make sure to limit the number of times | |
126 | * we allow xfs_trans_next_ail() to restart scanning from the | |
127 | * beginning of the list. We'd like not to stop until we've at least | |
128 | * tried to push on everything in the AIL with an LSN less than | |
129 | * the given threshold. However, we may give up before that if | |
130 | * we realize that we've been holding the AIL_LOCK for 'too long', | |
131 | * blocking interrupts. Currently, too long is < 500us roughly. | |
132 | */ | |
133 | flush_log = 0; | |
134 | restarts = 0; | |
135 | while (((restarts < XFS_TRANS_PUSH_AIL_RESTARTS) && | |
136 | (XFS_LSN_CMP(lip->li_lsn, threshold_lsn) < 0))) { | |
137 | /* | |
138 | * If we can lock the item without sleeping, unlock | |
139 | * the AIL lock and flush the item. Then re-grab the | |
140 | * AIL lock so we can look for the next item on the | |
141 | * AIL. Since we unlock the AIL while we flush the | |
142 | * item, the next routine may start over again at the | |
143 | * the beginning of the list if anything has changed. | |
144 | * That is what the generation count is for. | |
145 | * | |
146 | * If we can't lock the item, either its holder will flush | |
147 | * it or it is already being flushed or it is being relogged. | |
148 | * In any of these case it is being taken care of and we | |
149 | * can just skip to the next item in the list. | |
150 | */ | |
151 | lock_result = IOP_TRYLOCK(lip); | |
152 | switch (lock_result) { | |
153 | case XFS_ITEM_SUCCESS: | |
154 | AIL_UNLOCK(mp, s); | |
155 | XFS_STATS_INC(xs_push_ail_success); | |
156 | IOP_PUSH(lip); | |
157 | AIL_LOCK(mp,s); | |
158 | break; | |
159 | ||
160 | case XFS_ITEM_PUSHBUF: | |
161 | AIL_UNLOCK(mp, s); | |
162 | XFS_STATS_INC(xs_push_ail_pushbuf); | |
163 | #ifdef XFSRACEDEBUG | |
164 | delay_for_intr(); | |
165 | delay(300); | |
166 | #endif | |
167 | ASSERT(lip->li_ops->iop_pushbuf); | |
168 | ASSERT(lip); | |
169 | IOP_PUSHBUF(lip); | |
170 | AIL_LOCK(mp,s); | |
171 | break; | |
172 | ||
173 | case XFS_ITEM_PINNED: | |
174 | XFS_STATS_INC(xs_push_ail_pinned); | |
175 | flush_log = 1; | |
176 | break; | |
177 | ||
178 | case XFS_ITEM_LOCKED: | |
179 | XFS_STATS_INC(xs_push_ail_locked); | |
180 | break; | |
181 | ||
182 | case XFS_ITEM_FLUSHING: | |
183 | XFS_STATS_INC(xs_push_ail_flushing); | |
184 | break; | |
185 | ||
186 | default: | |
187 | ASSERT(0); | |
188 | break; | |
189 | } | |
190 | ||
191 | lip = xfs_trans_next_ail(mp, lip, &gen, &restarts); | |
192 | if (lip == NULL) { | |
193 | break; | |
194 | } | |
195 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
196 | /* | |
197 | * Just return if we shut down during the last try. | |
198 | */ | |
199 | AIL_UNLOCK(mp, s); | |
200 | return (xfs_lsn_t)0; | |
201 | } | |
202 | ||
203 | } | |
204 | ||
205 | if (flush_log) { | |
206 | /* | |
207 | * If something we need to push out was pinned, then | |
208 | * push out the log so it will become unpinned and | |
209 | * move forward in the AIL. | |
210 | */ | |
211 | AIL_UNLOCK(mp, s); | |
212 | XFS_STATS_INC(xs_push_ail_flush); | |
213 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE); | |
214 | AIL_LOCK(mp, s); | |
215 | } | |
216 | ||
217 | lip = xfs_ail_min(&(mp->m_ail)); | |
218 | if (lip == NULL) { | |
219 | lsn = (xfs_lsn_t)0; | |
220 | } else { | |
221 | lsn = lip->li_lsn; | |
222 | } | |
223 | ||
224 | AIL_UNLOCK(mp, s); | |
225 | return lsn; | |
226 | } /* xfs_trans_push_ail */ | |
227 | ||
228 | ||
229 | /* | |
230 | * This is to be called when an item is unlocked that may have | |
231 | * been in the AIL. It will wake up the first member of the AIL | |
232 | * wait list if this item's unlocking might allow it to progress. | |
233 | * If the item is in the AIL, then we need to get the AIL lock | |
234 | * while doing our checking so we don't race with someone going | |
235 | * to sleep waiting for this event in xfs_trans_push_ail(). | |
236 | */ | |
237 | void | |
238 | xfs_trans_unlocked_item( | |
239 | xfs_mount_t *mp, | |
240 | xfs_log_item_t *lip) | |
241 | { | |
242 | xfs_log_item_t *min_lip; | |
243 | ||
244 | /* | |
245 | * If we're forcibly shutting down, we may have | |
246 | * unlocked log items arbitrarily. The last thing | |
247 | * we want to do is to move the tail of the log | |
248 | * over some potentially valid data. | |
249 | */ | |
250 | if (!(lip->li_flags & XFS_LI_IN_AIL) || | |
251 | XFS_FORCED_SHUTDOWN(mp)) { | |
252 | return; | |
253 | } | |
254 | ||
255 | /* | |
256 | * This is the one case where we can call into xfs_ail_min() | |
257 | * without holding the AIL lock because we only care about the | |
258 | * case where we are at the tail of the AIL. If the object isn't | |
259 | * at the tail, it doesn't matter what result we get back. This | |
260 | * is slightly racy because since we were just unlocked, we could | |
261 | * go to sleep between the call to xfs_ail_min and the call to | |
262 | * xfs_log_move_tail, have someone else lock us, commit to us disk, | |
263 | * move us out of the tail of the AIL, and then we wake up. However, | |
264 | * the call to xfs_log_move_tail() doesn't do anything if there's | |
265 | * not enough free space to wake people up so we're safe calling it. | |
266 | */ | |
267 | min_lip = xfs_ail_min(&mp->m_ail); | |
268 | ||
269 | if (min_lip == lip) | |
270 | xfs_log_move_tail(mp, 1); | |
271 | } /* xfs_trans_unlocked_item */ | |
272 | ||
273 | ||
274 | /* | |
275 | * Update the position of the item in the AIL with the new | |
276 | * lsn. If it is not yet in the AIL, add it. Otherwise, move | |
277 | * it to its new position by removing it and re-adding it. | |
278 | * | |
279 | * Wakeup anyone with an lsn less than the item's lsn. If the item | |
280 | * we move in the AIL is the minimum one, update the tail lsn in the | |
281 | * log manager. | |
282 | * | |
283 | * Increment the AIL's generation count to indicate that the tree | |
284 | * has changed. | |
285 | * | |
286 | * This function must be called with the AIL lock held. The lock | |
287 | * is dropped before returning, so the caller must pass in the | |
288 | * cookie returned by AIL_LOCK. | |
289 | */ | |
290 | void | |
291 | xfs_trans_update_ail( | |
292 | xfs_mount_t *mp, | |
293 | xfs_log_item_t *lip, | |
294 | xfs_lsn_t lsn, | |
295 | unsigned long s) | |
296 | { | |
297 | xfs_ail_entry_t *ailp; | |
298 | xfs_log_item_t *dlip=NULL; | |
299 | xfs_log_item_t *mlip; /* ptr to minimum lip */ | |
300 | ||
301 | ailp = &(mp->m_ail); | |
302 | mlip = xfs_ail_min(ailp); | |
303 | ||
304 | if (lip->li_flags & XFS_LI_IN_AIL) { | |
305 | dlip = xfs_ail_delete(ailp, lip); | |
306 | ASSERT(dlip == lip); | |
307 | } else { | |
308 | lip->li_flags |= XFS_LI_IN_AIL; | |
309 | } | |
310 | ||
311 | lip->li_lsn = lsn; | |
312 | ||
313 | xfs_ail_insert(ailp, lip); | |
314 | mp->m_ail_gen++; | |
315 | ||
316 | if (mlip == dlip) { | |
317 | mlip = xfs_ail_min(&(mp->m_ail)); | |
318 | AIL_UNLOCK(mp, s); | |
319 | xfs_log_move_tail(mp, mlip->li_lsn); | |
320 | } else { | |
321 | AIL_UNLOCK(mp, s); | |
322 | } | |
323 | ||
324 | ||
325 | } /* xfs_trans_update_ail */ | |
326 | ||
327 | /* | |
328 | * Delete the given item from the AIL. It must already be in | |
329 | * the AIL. | |
330 | * | |
331 | * Wakeup anyone with an lsn less than item's lsn. If the item | |
332 | * we delete in the AIL is the minimum one, update the tail lsn in the | |
333 | * log manager. | |
334 | * | |
335 | * Clear the IN_AIL flag from the item, reset its lsn to 0, and | |
336 | * bump the AIL's generation count to indicate that the tree | |
337 | * has changed. | |
338 | * | |
339 | * This function must be called with the AIL lock held. The lock | |
340 | * is dropped before returning, so the caller must pass in the | |
341 | * cookie returned by AIL_LOCK. | |
342 | */ | |
343 | void | |
344 | xfs_trans_delete_ail( | |
345 | xfs_mount_t *mp, | |
346 | xfs_log_item_t *lip, | |
347 | unsigned long s) | |
348 | { | |
349 | xfs_ail_entry_t *ailp; | |
350 | xfs_log_item_t *dlip; | |
351 | xfs_log_item_t *mlip; | |
352 | ||
353 | if (lip->li_flags & XFS_LI_IN_AIL) { | |
354 | ailp = &(mp->m_ail); | |
355 | mlip = xfs_ail_min(ailp); | |
356 | dlip = xfs_ail_delete(ailp, lip); | |
357 | ASSERT(dlip == lip); | |
358 | ||
359 | ||
360 | lip->li_flags &= ~XFS_LI_IN_AIL; | |
361 | lip->li_lsn = 0; | |
362 | mp->m_ail_gen++; | |
363 | ||
364 | if (mlip == dlip) { | |
365 | mlip = xfs_ail_min(&(mp->m_ail)); | |
366 | AIL_UNLOCK(mp, s); | |
367 | xfs_log_move_tail(mp, (mlip ? mlip->li_lsn : 0)); | |
368 | } else { | |
369 | AIL_UNLOCK(mp, s); | |
370 | } | |
371 | } | |
372 | else { | |
373 | /* | |
374 | * If the file system is not being shutdown, we are in | |
375 | * serious trouble if we get to this stage. | |
376 | */ | |
377 | if (XFS_FORCED_SHUTDOWN(mp)) | |
378 | AIL_UNLOCK(mp, s); | |
379 | else { | |
380 | xfs_cmn_err(XFS_PTAG_AILDELETE, CE_ALERT, mp, | |
381 | "xfs_trans_delete_ail: attempting to delete a log item that is not in the AIL"); | |
382 | xfs_force_shutdown(mp, XFS_CORRUPT_INCORE); | |
383 | AIL_UNLOCK(mp, s); | |
384 | } | |
385 | } | |
386 | } | |
387 | ||
388 | ||
389 | ||
390 | /* | |
391 | * Return the item in the AIL with the smallest lsn. | |
392 | * Return the current tree generation number for use | |
393 | * in calls to xfs_trans_next_ail(). | |
394 | */ | |
395 | xfs_log_item_t * | |
396 | xfs_trans_first_ail( | |
397 | xfs_mount_t *mp, | |
398 | int *gen) | |
399 | { | |
400 | xfs_log_item_t *lip; | |
401 | ||
402 | lip = xfs_ail_min(&(mp->m_ail)); | |
403 | *gen = (int)mp->m_ail_gen; | |
404 | ||
405 | return (lip); | |
406 | } | |
407 | ||
408 | /* | |
409 | * If the generation count of the tree has not changed since the | |
410 | * caller last took something from the AIL, then return the elmt | |
411 | * in the tree which follows the one given. If the count has changed, | |
412 | * then return the minimum elmt of the AIL and bump the restarts counter | |
413 | * if one is given. | |
414 | */ | |
415 | xfs_log_item_t * | |
416 | xfs_trans_next_ail( | |
417 | xfs_mount_t *mp, | |
418 | xfs_log_item_t *lip, | |
419 | int *gen, | |
420 | int *restarts) | |
421 | { | |
422 | xfs_log_item_t *nlip; | |
423 | ||
424 | ASSERT(mp && lip && gen); | |
425 | if (mp->m_ail_gen == *gen) { | |
426 | nlip = xfs_ail_next(&(mp->m_ail), lip); | |
427 | } else { | |
428 | nlip = xfs_ail_min(&(mp->m_ail)); | |
429 | *gen = (int)mp->m_ail_gen; | |
430 | if (restarts != NULL) { | |
431 | XFS_STATS_INC(xs_push_ail_restarts); | |
432 | (*restarts)++; | |
433 | } | |
434 | } | |
435 | ||
436 | return (nlip); | |
437 | } | |
438 | ||
439 | ||
440 | /* | |
441 | * The active item list (AIL) is a doubly linked list of log | |
442 | * items sorted by ascending lsn. The base of the list is | |
443 | * a forw/back pointer pair embedded in the xfs mount structure. | |
444 | * The base is initialized with both pointers pointing to the | |
445 | * base. This case always needs to be distinguished, because | |
446 | * the base has no lsn to look at. We almost always insert | |
447 | * at the end of the list, so on inserts we search from the | |
448 | * end of the list to find where the new item belongs. | |
449 | */ | |
450 | ||
451 | /* | |
452 | * Initialize the doubly linked list to point only to itself. | |
453 | */ | |
454 | void | |
455 | xfs_trans_ail_init( | |
456 | xfs_mount_t *mp) | |
457 | { | |
458 | mp->m_ail.ail_forw = (xfs_log_item_t*)&(mp->m_ail); | |
459 | mp->m_ail.ail_back = (xfs_log_item_t*)&(mp->m_ail); | |
460 | } | |
461 | ||
462 | /* | |
463 | * Insert the given log item into the AIL. | |
464 | * We almost always insert at the end of the list, so on inserts | |
465 | * we search from the end of the list to find where the | |
466 | * new item belongs. | |
467 | */ | |
468 | STATIC void | |
469 | xfs_ail_insert( | |
470 | xfs_ail_entry_t *base, | |
471 | xfs_log_item_t *lip) | |
472 | /* ARGSUSED */ | |
473 | { | |
474 | xfs_log_item_t *next_lip; | |
475 | ||
476 | /* | |
477 | * If the list is empty, just insert the item. | |
478 | */ | |
479 | if (base->ail_back == (xfs_log_item_t*)base) { | |
480 | base->ail_forw = lip; | |
481 | base->ail_back = lip; | |
482 | lip->li_ail.ail_forw = (xfs_log_item_t*)base; | |
483 | lip->li_ail.ail_back = (xfs_log_item_t*)base; | |
484 | return; | |
485 | } | |
486 | ||
487 | next_lip = base->ail_back; | |
488 | while ((next_lip != (xfs_log_item_t*)base) && | |
489 | (XFS_LSN_CMP(next_lip->li_lsn, lip->li_lsn) > 0)) { | |
490 | next_lip = next_lip->li_ail.ail_back; | |
491 | } | |
492 | ASSERT((next_lip == (xfs_log_item_t*)base) || | |
493 | (XFS_LSN_CMP(next_lip->li_lsn, lip->li_lsn) <= 0)); | |
494 | lip->li_ail.ail_forw = next_lip->li_ail.ail_forw; | |
495 | lip->li_ail.ail_back = next_lip; | |
496 | next_lip->li_ail.ail_forw = lip; | |
497 | lip->li_ail.ail_forw->li_ail.ail_back = lip; | |
498 | ||
499 | xfs_ail_check(base); | |
500 | return; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Delete the given item from the AIL. Return a pointer to the item. | |
505 | */ | |
506 | /*ARGSUSED*/ | |
507 | STATIC xfs_log_item_t * | |
508 | xfs_ail_delete( | |
509 | xfs_ail_entry_t *base, | |
510 | xfs_log_item_t *lip) | |
511 | /* ARGSUSED */ | |
512 | { | |
513 | lip->li_ail.ail_forw->li_ail.ail_back = lip->li_ail.ail_back; | |
514 | lip->li_ail.ail_back->li_ail.ail_forw = lip->li_ail.ail_forw; | |
515 | lip->li_ail.ail_forw = NULL; | |
516 | lip->li_ail.ail_back = NULL; | |
517 | ||
518 | xfs_ail_check(base); | |
519 | return lip; | |
520 | } | |
521 | ||
522 | /* | |
523 | * Return a pointer to the first item in the AIL. | |
524 | * If the AIL is empty, then return NULL. | |
525 | */ | |
526 | STATIC xfs_log_item_t * | |
527 | xfs_ail_min( | |
528 | xfs_ail_entry_t *base) | |
529 | /* ARGSUSED */ | |
530 | { | |
531 | register xfs_log_item_t *forw = base->ail_forw; | |
532 | if (forw == (xfs_log_item_t*)base) { | |
533 | return NULL; | |
534 | } | |
535 | return forw; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Return a pointer to the item which follows | |
540 | * the given item in the AIL. If the given item | |
541 | * is the last item in the list, then return NULL. | |
542 | */ | |
543 | STATIC xfs_log_item_t * | |
544 | xfs_ail_next( | |
545 | xfs_ail_entry_t *base, | |
546 | xfs_log_item_t *lip) | |
547 | /* ARGSUSED */ | |
548 | { | |
549 | if (lip->li_ail.ail_forw == (xfs_log_item_t*)base) { | |
550 | return NULL; | |
551 | } | |
552 | return lip->li_ail.ail_forw; | |
553 | ||
554 | } | |
555 | ||
556 | #ifdef DEBUG | |
557 | /* | |
558 | * Check that the list is sorted as it should be. | |
559 | */ | |
560 | STATIC void | |
561 | xfs_ail_check( | |
562 | xfs_ail_entry_t *base) | |
563 | { | |
564 | xfs_log_item_t *lip; | |
565 | xfs_log_item_t *prev_lip; | |
566 | ||
567 | lip = base->ail_forw; | |
568 | if (lip == (xfs_log_item_t*)base) { | |
569 | /* | |
570 | * Make sure the pointers are correct when the list | |
571 | * is empty. | |
572 | */ | |
573 | ASSERT(base->ail_back == (xfs_log_item_t*)base); | |
574 | return; | |
575 | } | |
576 | ||
577 | /* | |
578 | * Walk the list checking forward and backward pointers, | |
579 | * lsn ordering, and that every entry has the XFS_LI_IN_AIL | |
580 | * flag set. | |
581 | */ | |
582 | prev_lip = (xfs_log_item_t*)base; | |
583 | while (lip != (xfs_log_item_t*)base) { | |
584 | if (prev_lip != (xfs_log_item_t*)base) { | |
585 | ASSERT(prev_lip->li_ail.ail_forw == lip); | |
586 | ASSERT(XFS_LSN_CMP(prev_lip->li_lsn, lip->li_lsn) <= 0); | |
587 | } | |
588 | ASSERT(lip->li_ail.ail_back == prev_lip); | |
589 | ASSERT((lip->li_flags & XFS_LI_IN_AIL) != 0); | |
590 | prev_lip = lip; | |
591 | lip = lip->li_ail.ail_forw; | |
592 | } | |
593 | ASSERT(lip == (xfs_log_item_t*)base); | |
594 | ASSERT(base->ail_back == prev_lip); | |
595 | } | |
596 | #endif /* DEBUG */ |