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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2004 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 | /* | |
34 | * High level interface routines for log manager | |
35 | */ | |
36 | ||
37 | #include "xfs.h" | |
38 | #include "xfs_macros.h" | |
39 | #include "xfs_types.h" | |
40 | #include "xfs_inum.h" | |
41 | #include "xfs_ag.h" | |
42 | #include "xfs_sb.h" | |
43 | #include "xfs_log.h" | |
44 | #include "xfs_trans.h" | |
45 | #include "xfs_dir.h" | |
46 | #include "xfs_dmapi.h" | |
47 | #include "xfs_mount.h" | |
48 | #include "xfs_error.h" | |
49 | #include "xfs_log_priv.h" | |
50 | #include "xfs_buf_item.h" | |
51 | #include "xfs_alloc_btree.h" | |
52 | #include "xfs_log_recover.h" | |
53 | #include "xfs_bit.h" | |
54 | #include "xfs_rw.h" | |
55 | #include "xfs_trans_priv.h" | |
56 | ||
57 | ||
58 | #define xlog_write_adv_cnt(ptr, len, off, bytes) \ | |
59 | { (ptr) += (bytes); \ | |
60 | (len) -= (bytes); \ | |
61 | (off) += (bytes);} | |
62 | ||
63 | /* Local miscellaneous function prototypes */ | |
64 | STATIC int xlog_bdstrat_cb(struct xfs_buf *); | |
65 | STATIC int xlog_commit_record(xfs_mount_t *mp, xlog_ticket_t *ticket, | |
66 | xlog_in_core_t **, xfs_lsn_t *); | |
67 | STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp, | |
68 | xfs_buftarg_t *log_target, | |
69 | xfs_daddr_t blk_offset, | |
70 | int num_bblks); | |
71 | STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes); | |
72 | STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog); | |
73 | STATIC void xlog_unalloc_log(xlog_t *log); | |
74 | STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[], | |
75 | int nentries, xfs_log_ticket_t tic, | |
76 | xfs_lsn_t *start_lsn, | |
77 | xlog_in_core_t **commit_iclog, | |
78 | uint flags); | |
79 | ||
80 | /* local state machine functions */ | |
81 | STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); | |
82 | STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog); | |
83 | STATIC int xlog_state_get_iclog_space(xlog_t *log, | |
84 | int len, | |
85 | xlog_in_core_t **iclog, | |
86 | xlog_ticket_t *ticket, | |
87 | int *continued_write, | |
88 | int *logoffsetp); | |
89 | STATIC void xlog_state_put_ticket(xlog_t *log, | |
90 | xlog_ticket_t *tic); | |
91 | STATIC int xlog_state_release_iclog(xlog_t *log, | |
92 | xlog_in_core_t *iclog); | |
93 | STATIC void xlog_state_switch_iclogs(xlog_t *log, | |
94 | xlog_in_core_t *iclog, | |
95 | int eventual_size); | |
96 | STATIC int xlog_state_sync(xlog_t *log, xfs_lsn_t lsn, uint flags); | |
97 | STATIC int xlog_state_sync_all(xlog_t *log, uint flags); | |
98 | STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); | |
99 | ||
100 | /* local functions to manipulate grant head */ | |
101 | STATIC int xlog_grant_log_space(xlog_t *log, | |
102 | xlog_ticket_t *xtic); | |
103 | STATIC void xlog_grant_push_ail(xfs_mount_t *mp, | |
104 | int need_bytes); | |
105 | STATIC void xlog_regrant_reserve_log_space(xlog_t *log, | |
106 | xlog_ticket_t *ticket); | |
107 | STATIC int xlog_regrant_write_log_space(xlog_t *log, | |
108 | xlog_ticket_t *ticket); | |
109 | STATIC void xlog_ungrant_log_space(xlog_t *log, | |
110 | xlog_ticket_t *ticket); | |
111 | ||
112 | ||
113 | /* local ticket functions */ | |
114 | STATIC void xlog_state_ticket_alloc(xlog_t *log); | |
115 | STATIC xlog_ticket_t *xlog_ticket_get(xlog_t *log, | |
116 | int unit_bytes, | |
117 | int count, | |
118 | char clientid, | |
119 | uint flags); | |
120 | STATIC void xlog_ticket_put(xlog_t *log, xlog_ticket_t *ticket); | |
121 | ||
122 | /* local debug functions */ | |
123 | #if defined(DEBUG) && !defined(XLOG_NOLOG) | |
124 | STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr); | |
125 | STATIC void xlog_verify_grant_head(xlog_t *log, int equals); | |
126 | STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, | |
127 | int count, boolean_t syncing); | |
128 | STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, | |
129 | xfs_lsn_t tail_lsn); | |
130 | #else | |
131 | #define xlog_verify_dest_ptr(a,b) | |
132 | #define xlog_verify_grant_head(a,b) | |
133 | #define xlog_verify_iclog(a,b,c,d) | |
134 | #define xlog_verify_tail_lsn(a,b,c) | |
135 | #endif | |
136 | ||
ba0f32d4 | 137 | STATIC int xlog_iclogs_empty(xlog_t *log); |
1da177e4 LT |
138 | |
139 | #ifdef DEBUG | |
140 | int xlog_do_error = 0; | |
141 | int xlog_req_num = 0; | |
142 | int xlog_error_mod = 33; | |
143 | #endif | |
144 | ||
145 | #define XLOG_FORCED_SHUTDOWN(log) (log->l_flags & XLOG_IO_ERROR) | |
146 | ||
147 | /* | |
148 | * 0 => disable log manager | |
149 | * 1 => enable log manager | |
150 | * 2 => enable log manager and log debugging | |
151 | */ | |
152 | #if defined(XLOG_NOLOG) || defined(DEBUG) | |
153 | int xlog_debug = 1; | |
154 | xfs_buftarg_t *xlog_target; | |
155 | #endif | |
156 | ||
157 | #if defined(XFS_LOG_TRACE) | |
158 | ||
159 | void | |
160 | xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string) | |
161 | { | |
162 | if (! log->l_grant_trace) { | |
163 | log->l_grant_trace = ktrace_alloc(1024, KM_NOSLEEP); | |
164 | if (! log->l_grant_trace) | |
165 | return; | |
166 | } | |
167 | ||
168 | ktrace_enter(log->l_grant_trace, | |
169 | (void *)tic, | |
170 | (void *)log->l_reserve_headq, | |
171 | (void *)log->l_write_headq, | |
172 | (void *)((unsigned long)log->l_grant_reserve_cycle), | |
173 | (void *)((unsigned long)log->l_grant_reserve_bytes), | |
174 | (void *)((unsigned long)log->l_grant_write_cycle), | |
175 | (void *)((unsigned long)log->l_grant_write_bytes), | |
176 | (void *)((unsigned long)log->l_curr_cycle), | |
177 | (void *)((unsigned long)log->l_curr_block), | |
178 | (void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)), | |
179 | (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)), | |
180 | (void *)string, | |
181 | (void *)((unsigned long)13), | |
182 | (void *)((unsigned long)14), | |
183 | (void *)((unsigned long)15), | |
184 | (void *)((unsigned long)16)); | |
185 | } | |
186 | ||
187 | void | |
188 | xlog_trace_iclog(xlog_in_core_t *iclog, uint state) | |
189 | { | |
190 | pid_t pid; | |
191 | ||
192 | pid = current_pid(); | |
193 | ||
194 | if (!iclog->ic_trace) | |
195 | iclog->ic_trace = ktrace_alloc(256, KM_SLEEP); | |
196 | ktrace_enter(iclog->ic_trace, | |
197 | (void *)((unsigned long)state), | |
198 | (void *)((unsigned long)pid), | |
199 | (void *)0, | |
200 | (void *)0, | |
201 | (void *)0, | |
202 | (void *)0, | |
203 | (void *)0, | |
204 | (void *)0, | |
205 | (void *)0, | |
206 | (void *)0, | |
207 | (void *)0, | |
208 | (void *)0, | |
209 | (void *)0, | |
210 | (void *)0, | |
211 | (void *)0, | |
212 | (void *)0); | |
213 | } | |
214 | ||
215 | #else | |
216 | #define xlog_trace_loggrant(log,tic,string) | |
217 | #define xlog_trace_iclog(iclog,state) | |
218 | #endif /* XFS_LOG_TRACE */ | |
219 | ||
220 | /* | |
221 | * NOTES: | |
222 | * | |
223 | * 1. currblock field gets updated at startup and after in-core logs | |
224 | * marked as with WANT_SYNC. | |
225 | */ | |
226 | ||
227 | /* | |
228 | * This routine is called when a user of a log manager ticket is done with | |
229 | * the reservation. If the ticket was ever used, then a commit record for | |
230 | * the associated transaction is written out as a log operation header with | |
231 | * no data. The flag XLOG_TIC_INITED is set when the first write occurs with | |
232 | * a given ticket. If the ticket was one with a permanent reservation, then | |
233 | * a few operations are done differently. Permanent reservation tickets by | |
234 | * default don't release the reservation. They just commit the current | |
235 | * transaction with the belief that the reservation is still needed. A flag | |
236 | * must be passed in before permanent reservations are actually released. | |
237 | * When these type of tickets are not released, they need to be set into | |
238 | * the inited state again. By doing this, a start record will be written | |
239 | * out when the next write occurs. | |
240 | */ | |
241 | xfs_lsn_t | |
242 | xfs_log_done(xfs_mount_t *mp, | |
243 | xfs_log_ticket_t xtic, | |
244 | void **iclog, | |
245 | uint flags) | |
246 | { | |
247 | xlog_t *log = mp->m_log; | |
248 | xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic; | |
249 | xfs_lsn_t lsn = 0; | |
250 | ||
251 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
252 | if (!xlog_debug && xlog_target == log->l_targ) | |
253 | return 0; | |
254 | #endif | |
255 | ||
256 | if (XLOG_FORCED_SHUTDOWN(log) || | |
257 | /* | |
258 | * If nothing was ever written, don't write out commit record. | |
259 | * If we get an error, just continue and give back the log ticket. | |
260 | */ | |
261 | (((ticket->t_flags & XLOG_TIC_INITED) == 0) && | |
262 | (xlog_commit_record(mp, ticket, | |
263 | (xlog_in_core_t **)iclog, &lsn)))) { | |
264 | lsn = (xfs_lsn_t) -1; | |
265 | if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { | |
266 | flags |= XFS_LOG_REL_PERM_RESERV; | |
267 | } | |
268 | } | |
269 | ||
270 | ||
271 | if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || | |
272 | (flags & XFS_LOG_REL_PERM_RESERV)) { | |
273 | /* | |
274 | * Release ticket if not permanent reservation or a specifc | |
275 | * request has been made to release a permanent reservation. | |
276 | */ | |
277 | xlog_ungrant_log_space(log, ticket); | |
278 | xlog_state_put_ticket(log, ticket); | |
279 | } else { | |
280 | xlog_regrant_reserve_log_space(log, ticket); | |
281 | } | |
282 | ||
283 | /* If this ticket was a permanent reservation and we aren't | |
284 | * trying to release it, reset the inited flags; so next time | |
285 | * we write, a start record will be written out. | |
286 | */ | |
287 | if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) && | |
288 | (flags & XFS_LOG_REL_PERM_RESERV) == 0) | |
289 | ticket->t_flags |= XLOG_TIC_INITED; | |
290 | ||
291 | return lsn; | |
292 | } /* xfs_log_done */ | |
293 | ||
294 | ||
295 | /* | |
296 | * Force the in-core log to disk. If flags == XFS_LOG_SYNC, | |
297 | * the force is done synchronously. | |
298 | * | |
299 | * Asynchronous forces are implemented by setting the WANT_SYNC | |
300 | * bit in the appropriate in-core log and then returning. | |
301 | * | |
302 | * Synchronous forces are implemented with a semaphore. All callers | |
303 | * to force a given lsn to disk will wait on a semaphore attached to the | |
304 | * specific in-core log. When given in-core log finally completes its | |
305 | * write to disk, that thread will wake up all threads waiting on the | |
306 | * semaphore. | |
307 | */ | |
308 | int | |
309 | xfs_log_force(xfs_mount_t *mp, | |
310 | xfs_lsn_t lsn, | |
311 | uint flags) | |
312 | { | |
313 | int rval; | |
314 | xlog_t *log = mp->m_log; | |
315 | ||
316 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
317 | if (!xlog_debug && xlog_target == log->l_targ) | |
318 | return 0; | |
319 | #endif | |
320 | ||
321 | ASSERT(flags & XFS_LOG_FORCE); | |
322 | ||
323 | XFS_STATS_INC(xs_log_force); | |
324 | ||
325 | if ((log->l_flags & XLOG_IO_ERROR) == 0) { | |
326 | if (lsn == 0) | |
327 | rval = xlog_state_sync_all(log, flags); | |
328 | else | |
329 | rval = xlog_state_sync(log, lsn, flags); | |
330 | } else { | |
331 | rval = XFS_ERROR(EIO); | |
332 | } | |
333 | ||
334 | return rval; | |
335 | ||
336 | } /* xfs_log_force */ | |
337 | ||
338 | /* | |
339 | * Attaches a new iclog I/O completion callback routine during | |
340 | * transaction commit. If the log is in error state, a non-zero | |
341 | * return code is handed back and the caller is responsible for | |
342 | * executing the callback at an appropriate time. | |
343 | */ | |
344 | int | |
345 | xfs_log_notify(xfs_mount_t *mp, /* mount of partition */ | |
346 | void *iclog_hndl, /* iclog to hang callback off */ | |
347 | xfs_log_callback_t *cb) | |
348 | { | |
349 | xlog_t *log = mp->m_log; | |
350 | xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; | |
351 | int abortflg, spl; | |
352 | ||
353 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
354 | if (!xlog_debug && xlog_target == log->l_targ) | |
355 | return 0; | |
356 | #endif | |
357 | cb->cb_next = NULL; | |
358 | spl = LOG_LOCK(log); | |
359 | abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); | |
360 | if (!abortflg) { | |
361 | ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || | |
362 | (iclog->ic_state == XLOG_STATE_WANT_SYNC)); | |
363 | cb->cb_next = NULL; | |
364 | *(iclog->ic_callback_tail) = cb; | |
365 | iclog->ic_callback_tail = &(cb->cb_next); | |
366 | } | |
367 | LOG_UNLOCK(log, spl); | |
368 | return abortflg; | |
369 | } /* xfs_log_notify */ | |
370 | ||
371 | int | |
372 | xfs_log_release_iclog(xfs_mount_t *mp, | |
373 | void *iclog_hndl) | |
374 | { | |
375 | xlog_t *log = mp->m_log; | |
376 | xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; | |
377 | ||
378 | if (xlog_state_release_iclog(log, iclog)) { | |
379 | xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); | |
380 | return(EIO); | |
381 | } | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | /* | |
387 | * 1. Reserve an amount of on-disk log space and return a ticket corresponding | |
388 | * to the reservation. | |
389 | * 2. Potentially, push buffers at tail of log to disk. | |
390 | * | |
391 | * Each reservation is going to reserve extra space for a log record header. | |
392 | * When writes happen to the on-disk log, we don't subtract the length of the | |
393 | * log record header from any reservation. By wasting space in each | |
394 | * reservation, we prevent over allocation problems. | |
395 | */ | |
396 | int | |
397 | xfs_log_reserve(xfs_mount_t *mp, | |
398 | int unit_bytes, | |
399 | int cnt, | |
400 | xfs_log_ticket_t *ticket, | |
401 | __uint8_t client, | |
402 | uint flags) | |
403 | { | |
404 | xlog_t *log = mp->m_log; | |
405 | xlog_ticket_t *internal_ticket; | |
406 | int retval; | |
407 | ||
408 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
409 | if (!xlog_debug && xlog_target == log->l_targ) | |
410 | return 0; | |
411 | #endif | |
412 | retval = 0; | |
413 | ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); | |
414 | ASSERT((flags & XFS_LOG_NOSLEEP) == 0); | |
415 | ||
416 | if (XLOG_FORCED_SHUTDOWN(log)) | |
417 | return XFS_ERROR(EIO); | |
418 | ||
419 | XFS_STATS_INC(xs_try_logspace); | |
420 | ||
421 | if (*ticket != NULL) { | |
422 | ASSERT(flags & XFS_LOG_PERM_RESERV); | |
423 | internal_ticket = (xlog_ticket_t *)*ticket; | |
424 | xlog_grant_push_ail(mp, internal_ticket->t_unit_res); | |
425 | retval = xlog_regrant_write_log_space(log, internal_ticket); | |
426 | } else { | |
427 | /* may sleep if need to allocate more tickets */ | |
428 | internal_ticket = xlog_ticket_get(log, unit_bytes, cnt, | |
429 | client, flags); | |
430 | *ticket = internal_ticket; | |
431 | xlog_grant_push_ail(mp, | |
432 | (internal_ticket->t_unit_res * | |
433 | internal_ticket->t_cnt)); | |
434 | retval = xlog_grant_log_space(log, internal_ticket); | |
435 | } | |
436 | ||
437 | return retval; | |
438 | } /* xfs_log_reserve */ | |
439 | ||
440 | ||
441 | /* | |
442 | * Mount a log filesystem | |
443 | * | |
444 | * mp - ubiquitous xfs mount point structure | |
445 | * log_target - buftarg of on-disk log device | |
446 | * blk_offset - Start block # where block size is 512 bytes (BBSIZE) | |
447 | * num_bblocks - Number of BBSIZE blocks in on-disk log | |
448 | * | |
449 | * Return error or zero. | |
450 | */ | |
451 | int | |
452 | xfs_log_mount(xfs_mount_t *mp, | |
453 | xfs_buftarg_t *log_target, | |
454 | xfs_daddr_t blk_offset, | |
455 | int num_bblks) | |
456 | { | |
457 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) | |
458 | cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); | |
459 | else { | |
460 | cmn_err(CE_NOTE, | |
461 | "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", | |
462 | mp->m_fsname); | |
463 | ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY); | |
464 | } | |
465 | ||
466 | mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); | |
467 | ||
468 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
469 | if (!xlog_debug) { | |
470 | cmn_err(CE_NOTE, "log dev: %s", XFS_BUFTARG_NAME(log_target)); | |
471 | return 0; | |
472 | } | |
473 | #endif | |
474 | /* | |
475 | * skip log recovery on a norecovery mount. pretend it all | |
476 | * just worked. | |
477 | */ | |
478 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { | |
479 | int error; | |
480 | vfs_t *vfsp = XFS_MTOVFS(mp); | |
481 | int readonly = (vfsp->vfs_flag & VFS_RDONLY); | |
482 | ||
483 | if (readonly) | |
484 | vfsp->vfs_flag &= ~VFS_RDONLY; | |
485 | ||
486 | error = xlog_recover(mp->m_log, readonly); | |
487 | ||
488 | if (readonly) | |
489 | vfsp->vfs_flag |= VFS_RDONLY; | |
490 | if (error) { | |
491 | cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); | |
492 | xlog_unalloc_log(mp->m_log); | |
493 | return error; | |
494 | } | |
495 | } | |
496 | ||
497 | /* Normal transactions can now occur */ | |
498 | mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; | |
499 | ||
500 | /* End mounting message in xfs_log_mount_finish */ | |
501 | return 0; | |
502 | } /* xfs_log_mount */ | |
503 | ||
504 | /* | |
505 | * Finish the recovery of the file system. This is separate from | |
506 | * the xfs_log_mount() call, because it depends on the code in | |
507 | * xfs_mountfs() to read in the root and real-time bitmap inodes | |
508 | * between calling xfs_log_mount() and here. | |
509 | * | |
510 | * mp - ubiquitous xfs mount point structure | |
511 | */ | |
512 | int | |
513 | xfs_log_mount_finish(xfs_mount_t *mp, int mfsi_flags) | |
514 | { | |
515 | int error; | |
516 | ||
517 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) | |
518 | error = xlog_recover_finish(mp->m_log, mfsi_flags); | |
519 | else { | |
520 | error = 0; | |
521 | ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY); | |
522 | } | |
523 | ||
524 | return error; | |
525 | } | |
526 | ||
527 | /* | |
528 | * Unmount processing for the log. | |
529 | */ | |
530 | int | |
531 | xfs_log_unmount(xfs_mount_t *mp) | |
532 | { | |
533 | int error; | |
534 | ||
535 | error = xfs_log_unmount_write(mp); | |
536 | xfs_log_unmount_dealloc(mp); | |
537 | return (error); | |
538 | } | |
539 | ||
540 | /* | |
541 | * Final log writes as part of unmount. | |
542 | * | |
543 | * Mark the filesystem clean as unmount happens. Note that during relocation | |
544 | * this routine needs to be executed as part of source-bag while the | |
545 | * deallocation must not be done until source-end. | |
546 | */ | |
547 | ||
548 | /* | |
549 | * Unmount record used to have a string "Unmount filesystem--" in the | |
550 | * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). | |
551 | * We just write the magic number now since that particular field isn't | |
552 | * currently architecture converted and "nUmount" is a bit foo. | |
553 | * As far as I know, there weren't any dependencies on the old behaviour. | |
554 | */ | |
555 | ||
556 | int | |
557 | xfs_log_unmount_write(xfs_mount_t *mp) | |
558 | { | |
559 | xlog_t *log = mp->m_log; | |
560 | xlog_in_core_t *iclog; | |
561 | #ifdef DEBUG | |
562 | xlog_in_core_t *first_iclog; | |
563 | #endif | |
564 | xfs_log_iovec_t reg[1]; | |
565 | xfs_log_ticket_t tic = NULL; | |
566 | xfs_lsn_t lsn; | |
567 | int error; | |
568 | SPLDECL(s); | |
569 | ||
570 | /* the data section must be 32 bit size aligned */ | |
571 | struct { | |
572 | __uint16_t magic; | |
573 | __uint16_t pad1; | |
574 | __uint32_t pad2; /* may as well make it 64 bits */ | |
575 | } magic = { XLOG_UNMOUNT_TYPE, 0, 0 }; | |
576 | ||
577 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
578 | if (!xlog_debug && xlog_target == log->l_targ) | |
579 | return 0; | |
580 | #endif | |
581 | ||
582 | /* | |
583 | * Don't write out unmount record on read-only mounts. | |
584 | * Or, if we are doing a forced umount (typically because of IO errors). | |
585 | */ | |
586 | if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY) | |
587 | return 0; | |
588 | ||
589 | xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC); | |
590 | ||
591 | #ifdef DEBUG | |
592 | first_iclog = iclog = log->l_iclog; | |
593 | do { | |
594 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
595 | ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); | |
596 | ASSERT(iclog->ic_offset == 0); | |
597 | } | |
598 | iclog = iclog->ic_next; | |
599 | } while (iclog != first_iclog); | |
600 | #endif | |
601 | if (! (XLOG_FORCED_SHUTDOWN(log))) { | |
602 | reg[0].i_addr = (void*)&magic; | |
603 | reg[0].i_len = sizeof(magic); | |
604 | ||
605 | error = xfs_log_reserve(mp, 600, 1, &tic, XFS_LOG, 0); | |
606 | if (!error) { | |
607 | /* remove inited flag */ | |
608 | ((xlog_ticket_t *)tic)->t_flags = 0; | |
609 | error = xlog_write(mp, reg, 1, tic, &lsn, | |
610 | NULL, XLOG_UNMOUNT_TRANS); | |
611 | /* | |
612 | * At this point, we're umounting anyway, | |
613 | * so there's no point in transitioning log state | |
614 | * to IOERROR. Just continue... | |
615 | */ | |
616 | } | |
617 | ||
618 | if (error) { | |
619 | xfs_fs_cmn_err(CE_ALERT, mp, | |
620 | "xfs_log_unmount: unmount record failed"); | |
621 | } | |
622 | ||
623 | ||
624 | s = LOG_LOCK(log); | |
625 | iclog = log->l_iclog; | |
626 | iclog->ic_refcnt++; | |
627 | LOG_UNLOCK(log, s); | |
628 | xlog_state_want_sync(log, iclog); | |
629 | (void) xlog_state_release_iclog(log, iclog); | |
630 | ||
631 | s = LOG_LOCK(log); | |
632 | if (!(iclog->ic_state == XLOG_STATE_ACTIVE || | |
633 | iclog->ic_state == XLOG_STATE_DIRTY)) { | |
634 | if (!XLOG_FORCED_SHUTDOWN(log)) { | |
635 | sv_wait(&iclog->ic_forcesema, PMEM, | |
636 | &log->l_icloglock, s); | |
637 | } else { | |
638 | LOG_UNLOCK(log, s); | |
639 | } | |
640 | } else { | |
641 | LOG_UNLOCK(log, s); | |
642 | } | |
643 | if (tic) | |
644 | xlog_state_put_ticket(log, tic); | |
645 | } else { | |
646 | /* | |
647 | * We're already in forced_shutdown mode, couldn't | |
648 | * even attempt to write out the unmount transaction. | |
649 | * | |
650 | * Go through the motions of sync'ing and releasing | |
651 | * the iclog, even though no I/O will actually happen, | |
652 | * we need to wait for other log I/O's that may already | |
653 | * be in progress. Do this as a separate section of | |
654 | * code so we'll know if we ever get stuck here that | |
655 | * we're in this odd situation of trying to unmount | |
656 | * a file system that went into forced_shutdown as | |
657 | * the result of an unmount.. | |
658 | */ | |
659 | s = LOG_LOCK(log); | |
660 | iclog = log->l_iclog; | |
661 | iclog->ic_refcnt++; | |
662 | LOG_UNLOCK(log, s); | |
663 | ||
664 | xlog_state_want_sync(log, iclog); | |
665 | (void) xlog_state_release_iclog(log, iclog); | |
666 | ||
667 | s = LOG_LOCK(log); | |
668 | ||
669 | if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE | |
670 | || iclog->ic_state == XLOG_STATE_DIRTY | |
671 | || iclog->ic_state == XLOG_STATE_IOERROR) ) { | |
672 | ||
673 | sv_wait(&iclog->ic_forcesema, PMEM, | |
674 | &log->l_icloglock, s); | |
675 | } else { | |
676 | LOG_UNLOCK(log, s); | |
677 | } | |
678 | } | |
679 | ||
680 | return 0; | |
681 | } /* xfs_log_unmount_write */ | |
682 | ||
683 | /* | |
684 | * Deallocate log structures for unmount/relocation. | |
685 | */ | |
686 | void | |
687 | xfs_log_unmount_dealloc(xfs_mount_t *mp) | |
688 | { | |
689 | xlog_unalloc_log(mp->m_log); | |
690 | } | |
691 | ||
692 | /* | |
693 | * Write region vectors to log. The write happens using the space reservation | |
694 | * of the ticket (tic). It is not a requirement that all writes for a given | |
695 | * transaction occur with one call to xfs_log_write(). | |
696 | */ | |
697 | int | |
698 | xfs_log_write(xfs_mount_t * mp, | |
699 | xfs_log_iovec_t reg[], | |
700 | int nentries, | |
701 | xfs_log_ticket_t tic, | |
702 | xfs_lsn_t *start_lsn) | |
703 | { | |
704 | int error; | |
705 | xlog_t *log = mp->m_log; | |
706 | ||
707 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
708 | if (!xlog_debug && xlog_target == log->l_targ) { | |
709 | *start_lsn = 0; | |
710 | return 0; | |
711 | } | |
712 | #endif | |
713 | if (XLOG_FORCED_SHUTDOWN(log)) | |
714 | return XFS_ERROR(EIO); | |
715 | ||
716 | if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) { | |
717 | xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); | |
718 | } | |
719 | return (error); | |
720 | } /* xfs_log_write */ | |
721 | ||
722 | ||
723 | void | |
724 | xfs_log_move_tail(xfs_mount_t *mp, | |
725 | xfs_lsn_t tail_lsn) | |
726 | { | |
727 | xlog_ticket_t *tic; | |
728 | xlog_t *log = mp->m_log; | |
729 | int need_bytes, free_bytes, cycle, bytes; | |
730 | SPLDECL(s); | |
731 | ||
732 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
733 | if (!xlog_debug && xlog_target == log->l_targ) | |
734 | return; | |
735 | #endif | |
736 | /* XXXsup tmp */ | |
737 | if (XLOG_FORCED_SHUTDOWN(log)) | |
738 | return; | |
739 | ASSERT(!XFS_FORCED_SHUTDOWN(mp)); | |
740 | ||
741 | if (tail_lsn == 0) { | |
742 | /* needed since sync_lsn is 64 bits */ | |
743 | s = LOG_LOCK(log); | |
744 | tail_lsn = log->l_last_sync_lsn; | |
745 | LOG_UNLOCK(log, s); | |
746 | } | |
747 | ||
748 | s = GRANT_LOCK(log); | |
749 | ||
750 | /* Also an invalid lsn. 1 implies that we aren't passing in a valid | |
751 | * tail_lsn. | |
752 | */ | |
753 | if (tail_lsn != 1) { | |
754 | log->l_tail_lsn = tail_lsn; | |
755 | } | |
756 | ||
757 | if ((tic = log->l_write_headq)) { | |
758 | #ifdef DEBUG | |
759 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
760 | panic("Recovery problem"); | |
761 | #endif | |
762 | cycle = log->l_grant_write_cycle; | |
763 | bytes = log->l_grant_write_bytes; | |
764 | free_bytes = xlog_space_left(log, cycle, bytes); | |
765 | do { | |
766 | ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); | |
767 | ||
768 | if (free_bytes < tic->t_unit_res && tail_lsn != 1) | |
769 | break; | |
770 | tail_lsn = 0; | |
771 | free_bytes -= tic->t_unit_res; | |
772 | sv_signal(&tic->t_sema); | |
773 | tic = tic->t_next; | |
774 | } while (tic != log->l_write_headq); | |
775 | } | |
776 | if ((tic = log->l_reserve_headq)) { | |
777 | #ifdef DEBUG | |
778 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
779 | panic("Recovery problem"); | |
780 | #endif | |
781 | cycle = log->l_grant_reserve_cycle; | |
782 | bytes = log->l_grant_reserve_bytes; | |
783 | free_bytes = xlog_space_left(log, cycle, bytes); | |
784 | do { | |
785 | if (tic->t_flags & XLOG_TIC_PERM_RESERV) | |
786 | need_bytes = tic->t_unit_res*tic->t_cnt; | |
787 | else | |
788 | need_bytes = tic->t_unit_res; | |
789 | if (free_bytes < need_bytes && tail_lsn != 1) | |
790 | break; | |
791 | tail_lsn = 0; | |
792 | free_bytes -= need_bytes; | |
793 | sv_signal(&tic->t_sema); | |
794 | tic = tic->t_next; | |
795 | } while (tic != log->l_reserve_headq); | |
796 | } | |
797 | GRANT_UNLOCK(log, s); | |
798 | } /* xfs_log_move_tail */ | |
799 | ||
800 | /* | |
801 | * Determine if we have a transaction that has gone to disk | |
802 | * that needs to be covered. Log activity needs to be idle (no AIL and | |
803 | * nothing in the iclogs). And, we need to be in the right state indicating | |
804 | * something has gone out. | |
805 | */ | |
806 | int | |
807 | xfs_log_need_covered(xfs_mount_t *mp) | |
808 | { | |
809 | SPLDECL(s); | |
810 | int needed = 0, gen; | |
811 | xlog_t *log = mp->m_log; | |
812 | vfs_t *vfsp = XFS_MTOVFS(mp); | |
813 | ||
814 | if (fs_frozen(vfsp) || XFS_FORCED_SHUTDOWN(mp) || | |
815 | (vfsp->vfs_flag & VFS_RDONLY)) | |
816 | return 0; | |
817 | ||
818 | s = LOG_LOCK(log); | |
819 | if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || | |
820 | (log->l_covered_state == XLOG_STATE_COVER_NEED2)) | |
821 | && !xfs_trans_first_ail(mp, &gen) | |
822 | && xlog_iclogs_empty(log)) { | |
823 | if (log->l_covered_state == XLOG_STATE_COVER_NEED) | |
824 | log->l_covered_state = XLOG_STATE_COVER_DONE; | |
825 | else { | |
826 | ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); | |
827 | log->l_covered_state = XLOG_STATE_COVER_DONE2; | |
828 | } | |
829 | needed = 1; | |
830 | } | |
831 | LOG_UNLOCK(log, s); | |
832 | return(needed); | |
833 | } | |
834 | ||
835 | /****************************************************************************** | |
836 | * | |
837 | * local routines | |
838 | * | |
839 | ****************************************************************************** | |
840 | */ | |
841 | ||
842 | /* xfs_trans_tail_ail returns 0 when there is nothing in the list. | |
843 | * The log manager must keep track of the last LR which was committed | |
844 | * to disk. The lsn of this LR will become the new tail_lsn whenever | |
845 | * xfs_trans_tail_ail returns 0. If we don't do this, we run into | |
846 | * the situation where stuff could be written into the log but nothing | |
847 | * was ever in the AIL when asked. Eventually, we panic since the | |
848 | * tail hits the head. | |
849 | * | |
850 | * We may be holding the log iclog lock upon entering this routine. | |
851 | */ | |
852 | xfs_lsn_t | |
853 | xlog_assign_tail_lsn(xfs_mount_t *mp) | |
854 | { | |
855 | xfs_lsn_t tail_lsn; | |
856 | SPLDECL(s); | |
857 | xlog_t *log = mp->m_log; | |
858 | ||
859 | tail_lsn = xfs_trans_tail_ail(mp); | |
860 | s = GRANT_LOCK(log); | |
861 | if (tail_lsn != 0) { | |
862 | log->l_tail_lsn = tail_lsn; | |
863 | } else { | |
864 | tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; | |
865 | } | |
866 | GRANT_UNLOCK(log, s); | |
867 | ||
868 | return tail_lsn; | |
869 | } /* xlog_assign_tail_lsn */ | |
870 | ||
871 | ||
872 | /* | |
873 | * Return the space in the log between the tail and the head. The head | |
874 | * is passed in the cycle/bytes formal parms. In the special case where | |
875 | * the reserve head has wrapped passed the tail, this calculation is no | |
876 | * longer valid. In this case, just return 0 which means there is no space | |
877 | * in the log. This works for all places where this function is called | |
878 | * with the reserve head. Of course, if the write head were to ever | |
879 | * wrap the tail, we should blow up. Rather than catch this case here, | |
880 | * we depend on other ASSERTions in other parts of the code. XXXmiken | |
881 | * | |
882 | * This code also handles the case where the reservation head is behind | |
883 | * the tail. The details of this case are described below, but the end | |
884 | * result is that we return the size of the log as the amount of space left. | |
885 | */ | |
886 | int | |
887 | xlog_space_left(xlog_t *log, int cycle, int bytes) | |
888 | { | |
889 | int free_bytes; | |
890 | int tail_bytes; | |
891 | int tail_cycle; | |
892 | ||
893 | tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); | |
894 | tail_cycle = CYCLE_LSN(log->l_tail_lsn); | |
895 | if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { | |
896 | free_bytes = log->l_logsize - (bytes - tail_bytes); | |
897 | } else if ((tail_cycle + 1) < cycle) { | |
898 | return 0; | |
899 | } else if (tail_cycle < cycle) { | |
900 | ASSERT(tail_cycle == (cycle - 1)); | |
901 | free_bytes = tail_bytes - bytes; | |
902 | } else { | |
903 | /* | |
904 | * The reservation head is behind the tail. | |
905 | * In this case we just want to return the size of the | |
906 | * log as the amount of space left. | |
907 | */ | |
908 | xfs_fs_cmn_err(CE_ALERT, log->l_mp, | |
909 | "xlog_space_left: head behind tail\n" | |
910 | " tail_cycle = %d, tail_bytes = %d\n" | |
911 | " GH cycle = %d, GH bytes = %d", | |
912 | tail_cycle, tail_bytes, cycle, bytes); | |
913 | ASSERT(0); | |
914 | free_bytes = log->l_logsize; | |
915 | } | |
916 | return free_bytes; | |
917 | } /* xlog_space_left */ | |
918 | ||
919 | ||
920 | /* | |
921 | * Log function which is called when an io completes. | |
922 | * | |
923 | * The log manager needs its own routine, in order to control what | |
924 | * happens with the buffer after the write completes. | |
925 | */ | |
926 | void | |
927 | xlog_iodone(xfs_buf_t *bp) | |
928 | { | |
929 | xlog_in_core_t *iclog; | |
930 | xlog_t *l; | |
931 | int aborted; | |
932 | ||
933 | iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); | |
934 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); | |
935 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); | |
936 | aborted = 0; | |
937 | ||
938 | /* | |
939 | * Some versions of cpp barf on the recursive definition of | |
940 | * ic_log -> hic_fields.ic_log and expand ic_log twice when | |
941 | * it is passed through two macros. Workaround broken cpp. | |
942 | */ | |
943 | l = iclog->ic_log; | |
944 | ||
945 | /* | |
946 | * Race to shutdown the filesystem if we see an error. | |
947 | */ | |
948 | if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, | |
949 | XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { | |
950 | xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); | |
951 | XFS_BUF_STALE(bp); | |
952 | xfs_force_shutdown(l->l_mp, XFS_LOG_IO_ERROR); | |
953 | /* | |
954 | * This flag will be propagated to the trans-committed | |
955 | * callback routines to let them know that the log-commit | |
956 | * didn't succeed. | |
957 | */ | |
958 | aborted = XFS_LI_ABORTED; | |
959 | } else if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
960 | aborted = XFS_LI_ABORTED; | |
961 | } | |
962 | xlog_state_done_syncing(iclog, aborted); | |
963 | if (!(XFS_BUF_ISASYNC(bp))) { | |
964 | /* | |
965 | * Corresponding psema() will be done in bwrite(). If we don't | |
966 | * vsema() here, panic. | |
967 | */ | |
968 | XFS_BUF_V_IODONESEMA(bp); | |
969 | } | |
970 | } /* xlog_iodone */ | |
971 | ||
972 | /* | |
973 | * The bdstrat callback function for log bufs. This gives us a central | |
974 | * place to trap bufs in case we get hit by a log I/O error and need to | |
975 | * shutdown. Actually, in practice, even when we didn't get a log error, | |
976 | * we transition the iclogs to IOERROR state *after* flushing all existing | |
977 | * iclogs to disk. This is because we don't want anymore new transactions to be | |
978 | * started or completed afterwards. | |
979 | */ | |
980 | STATIC int | |
981 | xlog_bdstrat_cb(struct xfs_buf *bp) | |
982 | { | |
983 | xlog_in_core_t *iclog; | |
984 | ||
985 | iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); | |
986 | ||
987 | if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) { | |
988 | /* note for irix bstrat will need struct bdevsw passed | |
989 | * Fix the following macro if the code ever is merged | |
990 | */ | |
991 | XFS_bdstrat(bp); | |
992 | return 0; | |
993 | } | |
994 | ||
995 | xfs_buftrace("XLOG__BDSTRAT IOERROR", bp); | |
996 | XFS_BUF_ERROR(bp, EIO); | |
997 | XFS_BUF_STALE(bp); | |
998 | xfs_biodone(bp); | |
999 | return (XFS_ERROR(EIO)); | |
1000 | ||
1001 | ||
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * Return size of each in-core log record buffer. | |
1006 | * | |
1007 | * Low memory machines only get 2 16KB buffers. We don't want to waste | |
1008 | * memory here. However, all other machines get at least 2 32KB buffers. | |
1009 | * The number is hard coded because we don't care about the minimum | |
1010 | * memory size, just 32MB systems. | |
1011 | * | |
1012 | * If the filesystem blocksize is too large, we may need to choose a | |
1013 | * larger size since the directory code currently logs entire blocks. | |
1014 | */ | |
1015 | ||
1016 | STATIC void | |
1017 | xlog_get_iclog_buffer_size(xfs_mount_t *mp, | |
1018 | xlog_t *log) | |
1019 | { | |
1020 | int size; | |
1021 | int xhdrs; | |
1022 | ||
1023 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
1024 | /* | |
1025 | * When logbufs == 0, someone has disabled the log from the FSTAB | |
1026 | * file. This is not a documented feature. We need to set xlog_debug | |
1027 | * to zero (this deactivates the log) and set xlog_target to the | |
1028 | * appropriate device. Only one filesystem may be affected as such | |
1029 | * since this is just a performance hack to test what we might be able | |
1030 | * to get if the log were not present. | |
1031 | */ | |
1032 | if (mp->m_logbufs == 0) { | |
1033 | xlog_debug = 0; | |
1034 | xlog_target = log->l_targ; | |
1035 | log->l_iclog_bufs = XLOG_MIN_ICLOGS; | |
1036 | } else | |
1037 | #endif | |
1038 | { | |
1039 | /* | |
1040 | * This is the normal path. If m_logbufs == -1, then the | |
1041 | * admin has chosen to use the system defaults for logbuffers. | |
1042 | */ | |
1043 | if (mp->m_logbufs == -1) { | |
1044 | if (xfs_physmem <= btoc(128*1024*1024)) { | |
1045 | log->l_iclog_bufs = XLOG_MIN_ICLOGS; | |
1046 | } else if (xfs_physmem <= btoc(400*1024*1024)) { | |
1047 | log->l_iclog_bufs = XLOG_MED_ICLOGS; | |
1048 | } else { | |
1049 | /* 256K with 32K bufs */ | |
1050 | log->l_iclog_bufs = XLOG_MAX_ICLOGS; | |
1051 | } | |
1052 | } else | |
1053 | log->l_iclog_bufs = mp->m_logbufs; | |
1054 | ||
1055 | #if defined(DEBUG) || defined(XLOG_NOLOG) | |
1056 | /* We are reactivating a filesystem after it was inactive */ | |
1057 | if (log->l_targ == xlog_target) { | |
1058 | xlog_target = NULL; | |
1059 | xlog_debug = 1; | |
1060 | } | |
1061 | #endif | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * Buffer size passed in from mount system call. | |
1066 | */ | |
1067 | if (mp->m_logbsize != -1) { | |
1068 | size = log->l_iclog_size = mp->m_logbsize; | |
1069 | log->l_iclog_size_log = 0; | |
1070 | while (size != 1) { | |
1071 | log->l_iclog_size_log++; | |
1072 | size >>= 1; | |
1073 | } | |
1074 | ||
1075 | if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) { | |
1076 | /* # headers = size / 32K | |
1077 | * one header holds cycles from 32K of data | |
1078 | */ | |
1079 | ||
1080 | xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; | |
1081 | if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) | |
1082 | xhdrs++; | |
1083 | log->l_iclog_hsize = xhdrs << BBSHIFT; | |
1084 | log->l_iclog_heads = xhdrs; | |
1085 | } else { | |
1086 | ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); | |
1087 | log->l_iclog_hsize = BBSIZE; | |
1088 | log->l_iclog_heads = 1; | |
1089 | } | |
1090 | return; | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * Special case machines that have less than 32MB of memory. | |
1095 | * All machines with more memory use 32KB buffers. | |
1096 | */ | |
1097 | if (xfs_physmem <= btoc(32*1024*1024)) { | |
1098 | /* Don't change; min configuration */ | |
1099 | log->l_iclog_size = XLOG_RECORD_BSIZE; /* 16k */ | |
1100 | log->l_iclog_size_log = XLOG_RECORD_BSHIFT; | |
1101 | } else { | |
1102 | log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; /* 32k */ | |
1103 | log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; | |
1104 | } | |
1105 | ||
1106 | /* the default log size is 16k or 32k which is one header sector */ | |
1107 | log->l_iclog_hsize = BBSIZE; | |
1108 | log->l_iclog_heads = 1; | |
1109 | ||
1110 | /* | |
1111 | * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use | |
1112 | * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers. | |
1113 | */ | |
1114 | if (mp->m_sb.sb_blocksize >= 16*1024) { | |
1115 | log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; | |
1116 | log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; | |
1117 | if (mp->m_logbufs == -1) { | |
1118 | switch (mp->m_sb.sb_blocksize) { | |
1119 | case 16*1024: /* 16 KB */ | |
1120 | log->l_iclog_bufs = 3; | |
1121 | break; | |
1122 | case 32*1024: /* 32 KB */ | |
1123 | log->l_iclog_bufs = 4; | |
1124 | break; | |
1125 | case 64*1024: /* 64 KB */ | |
1126 | log->l_iclog_bufs = 8; | |
1127 | break; | |
1128 | default: | |
1129 | xlog_panic("XFS: Invalid blocksize"); | |
1130 | break; | |
1131 | } | |
1132 | } | |
1133 | } | |
1134 | } /* xlog_get_iclog_buffer_size */ | |
1135 | ||
1136 | ||
1137 | /* | |
1138 | * This routine initializes some of the log structure for a given mount point. | |
1139 | * Its primary purpose is to fill in enough, so recovery can occur. However, | |
1140 | * some other stuff may be filled in too. | |
1141 | */ | |
1142 | STATIC xlog_t * | |
1143 | xlog_alloc_log(xfs_mount_t *mp, | |
1144 | xfs_buftarg_t *log_target, | |
1145 | xfs_daddr_t blk_offset, | |
1146 | int num_bblks) | |
1147 | { | |
1148 | xlog_t *log; | |
1149 | xlog_rec_header_t *head; | |
1150 | xlog_in_core_t **iclogp; | |
1151 | xlog_in_core_t *iclog, *prev_iclog=NULL; | |
1152 | xfs_buf_t *bp; | |
1153 | int i; | |
1154 | int iclogsize; | |
1155 | ||
1156 | log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP); | |
1157 | ||
1158 | log->l_mp = mp; | |
1159 | log->l_targ = log_target; | |
1160 | log->l_logsize = BBTOB(num_bblks); | |
1161 | log->l_logBBstart = blk_offset; | |
1162 | log->l_logBBsize = num_bblks; | |
1163 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1164 | log->l_flags |= XLOG_ACTIVE_RECOVERY; | |
1165 | ||
1166 | log->l_prev_block = -1; | |
1167 | ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, 1, 0); | |
1168 | /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ | |
1169 | log->l_last_sync_lsn = log->l_tail_lsn; | |
1170 | log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ | |
1171 | log->l_grant_reserve_cycle = 1; | |
1172 | log->l_grant_write_cycle = 1; | |
1173 | ||
1174 | if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) { | |
1175 | log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; | |
1176 | ASSERT(log->l_sectbb_log <= mp->m_sectbb_log); | |
1177 | /* for larger sector sizes, must have v2 or external log */ | |
1178 | ASSERT(log->l_sectbb_log == 0 || | |
1179 | log->l_logBBstart == 0 || | |
1180 | XFS_SB_VERSION_HASLOGV2(&mp->m_sb)); | |
1181 | ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT); | |
1182 | } | |
1183 | log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; | |
1184 | ||
1185 | xlog_get_iclog_buffer_size(mp, log); | |
1186 | ||
1187 | bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); | |
1188 | XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); | |
1189 | XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); | |
1190 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); | |
1191 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
1192 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
1193 | log->l_xbuf = bp; | |
1194 | ||
1195 | spinlock_init(&log->l_icloglock, "iclog"); | |
1196 | spinlock_init(&log->l_grant_lock, "grhead_iclog"); | |
1197 | initnsema(&log->l_flushsema, 0, "ic-flush"); | |
1198 | xlog_state_ticket_alloc(log); /* wait until after icloglock inited */ | |
1199 | ||
1200 | /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ | |
1201 | ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); | |
1202 | ||
1203 | iclogp = &log->l_iclog; | |
1204 | /* | |
1205 | * The amount of memory to allocate for the iclog structure is | |
1206 | * rather funky due to the way the structure is defined. It is | |
1207 | * done this way so that we can use different sizes for machines | |
1208 | * with different amounts of memory. See the definition of | |
1209 | * xlog_in_core_t in xfs_log_priv.h for details. | |
1210 | */ | |
1211 | iclogsize = log->l_iclog_size; | |
1212 | ASSERT(log->l_iclog_size >= 4096); | |
1213 | for (i=0; i < log->l_iclog_bufs; i++) { | |
1214 | *iclogp = (xlog_in_core_t *) | |
1215 | kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP); | |
1216 | iclog = *iclogp; | |
1217 | iclog->hic_data = (xlog_in_core_2_t *) | |
1218 | kmem_zalloc(iclogsize, KM_SLEEP); | |
1219 | ||
1220 | iclog->ic_prev = prev_iclog; | |
1221 | prev_iclog = iclog; | |
1222 | log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); | |
1223 | ||
1224 | head = &iclog->ic_header; | |
1225 | memset(head, 0, sizeof(xlog_rec_header_t)); | |
1226 | INT_SET(head->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM); | |
1227 | INT_SET(head->h_version, ARCH_CONVERT, | |
1228 | XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1); | |
1229 | INT_SET(head->h_size, ARCH_CONVERT, log->l_iclog_size); | |
1230 | /* new fields */ | |
1231 | INT_SET(head->h_fmt, ARCH_CONVERT, XLOG_FMT); | |
1232 | memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); | |
1233 | ||
1234 | bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); | |
1235 | XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); | |
1236 | XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); | |
1237 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); | |
1238 | iclog->ic_bp = bp; | |
1239 | ||
1240 | iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; | |
1241 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
1242 | iclog->ic_log = log; | |
1243 | iclog->ic_callback_tail = &(iclog->ic_callback); | |
1244 | iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize; | |
1245 | ||
1246 | ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); | |
1247 | ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); | |
1248 | sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force"); | |
1249 | sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write"); | |
1250 | ||
1251 | iclogp = &iclog->ic_next; | |
1252 | } | |
1253 | *iclogp = log->l_iclog; /* complete ring */ | |
1254 | log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ | |
1255 | ||
1256 | return log; | |
1257 | } /* xlog_alloc_log */ | |
1258 | ||
1259 | ||
1260 | /* | |
1261 | * Write out the commit record of a transaction associated with the given | |
1262 | * ticket. Return the lsn of the commit record. | |
1263 | */ | |
1264 | STATIC int | |
1265 | xlog_commit_record(xfs_mount_t *mp, | |
1266 | xlog_ticket_t *ticket, | |
1267 | xlog_in_core_t **iclog, | |
1268 | xfs_lsn_t *commitlsnp) | |
1269 | { | |
1270 | int error; | |
1271 | xfs_log_iovec_t reg[1]; | |
1272 | ||
1273 | reg[0].i_addr = NULL; | |
1274 | reg[0].i_len = 0; | |
1275 | ||
1276 | ASSERT_ALWAYS(iclog); | |
1277 | if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, | |
1278 | iclog, XLOG_COMMIT_TRANS))) { | |
1279 | xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); | |
1280 | } | |
1281 | return (error); | |
1282 | } /* xlog_commit_record */ | |
1283 | ||
1284 | ||
1285 | /* | |
1286 | * Push on the buffer cache code if we ever use more than 75% of the on-disk | |
1287 | * log space. This code pushes on the lsn which would supposedly free up | |
1288 | * the 25% which we want to leave free. We may need to adopt a policy which | |
1289 | * pushes on an lsn which is further along in the log once we reach the high | |
1290 | * water mark. In this manner, we would be creating a low water mark. | |
1291 | */ | |
1292 | void | |
1293 | xlog_grant_push_ail(xfs_mount_t *mp, | |
1294 | int need_bytes) | |
1295 | { | |
1296 | xlog_t *log = mp->m_log; /* pointer to the log */ | |
1297 | xfs_lsn_t tail_lsn; /* lsn of the log tail */ | |
1298 | xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ | |
1299 | int free_blocks; /* free blocks left to write to */ | |
1300 | int free_bytes; /* free bytes left to write to */ | |
1301 | int threshold_block; /* block in lsn we'd like to be at */ | |
1302 | int threshold_cycle; /* lsn cycle we'd like to be at */ | |
1303 | int free_threshold; | |
1304 | SPLDECL(s); | |
1305 | ||
1306 | ASSERT(BTOBB(need_bytes) < log->l_logBBsize); | |
1307 | ||
1308 | s = GRANT_LOCK(log); | |
1309 | free_bytes = xlog_space_left(log, | |
1310 | log->l_grant_reserve_cycle, | |
1311 | log->l_grant_reserve_bytes); | |
1312 | tail_lsn = log->l_tail_lsn; | |
1313 | free_blocks = BTOBBT(free_bytes); | |
1314 | ||
1315 | /* | |
1316 | * Set the threshold for the minimum number of free blocks in the | |
1317 | * log to the maximum of what the caller needs, one quarter of the | |
1318 | * log, and 256 blocks. | |
1319 | */ | |
1320 | free_threshold = BTOBB(need_bytes); | |
1321 | free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); | |
1322 | free_threshold = MAX(free_threshold, 256); | |
1323 | if (free_blocks < free_threshold) { | |
1324 | threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; | |
1325 | threshold_cycle = CYCLE_LSN(tail_lsn); | |
1326 | if (threshold_block >= log->l_logBBsize) { | |
1327 | threshold_block -= log->l_logBBsize; | |
1328 | threshold_cycle += 1; | |
1329 | } | |
1330 | ASSIGN_ANY_LSN_HOST(threshold_lsn, threshold_cycle, | |
1331 | threshold_block); | |
1332 | ||
1333 | /* Don't pass in an lsn greater than the lsn of the last | |
1334 | * log record known to be on disk. | |
1335 | */ | |
1336 | if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) | |
1337 | threshold_lsn = log->l_last_sync_lsn; | |
1338 | } | |
1339 | GRANT_UNLOCK(log, s); | |
1340 | ||
1341 | /* | |
1342 | * Get the transaction layer to kick the dirty buffers out to | |
1343 | * disk asynchronously. No point in trying to do this if | |
1344 | * the filesystem is shutting down. | |
1345 | */ | |
1346 | if (threshold_lsn && | |
1347 | !XLOG_FORCED_SHUTDOWN(log)) | |
1348 | xfs_trans_push_ail(mp, threshold_lsn); | |
1349 | } /* xlog_grant_push_ail */ | |
1350 | ||
1351 | ||
1352 | /* | |
1353 | * Flush out the in-core log (iclog) to the on-disk log in an asynchronous | |
1354 | * fashion. Previously, we should have moved the current iclog | |
1355 | * ptr in the log to point to the next available iclog. This allows further | |
1356 | * write to continue while this code syncs out an iclog ready to go. | |
1357 | * Before an in-core log can be written out, the data section must be scanned | |
1358 | * to save away the 1st word of each BBSIZE block into the header. We replace | |
1359 | * it with the current cycle count. Each BBSIZE block is tagged with the | |
1360 | * cycle count because there in an implicit assumption that drives will | |
1361 | * guarantee that entire 512 byte blocks get written at once. In other words, | |
1362 | * we can't have part of a 512 byte block written and part not written. By | |
1363 | * tagging each block, we will know which blocks are valid when recovering | |
1364 | * after an unclean shutdown. | |
1365 | * | |
1366 | * This routine is single threaded on the iclog. No other thread can be in | |
1367 | * this routine with the same iclog. Changing contents of iclog can there- | |
1368 | * fore be done without grabbing the state machine lock. Updating the global | |
1369 | * log will require grabbing the lock though. | |
1370 | * | |
1371 | * The entire log manager uses a logical block numbering scheme. Only | |
1372 | * log_sync (and then only bwrite()) know about the fact that the log may | |
1373 | * not start with block zero on a given device. The log block start offset | |
1374 | * is added immediately before calling bwrite(). | |
1375 | */ | |
1376 | ||
1377 | int | |
1378 | xlog_sync(xlog_t *log, | |
1379 | xlog_in_core_t *iclog) | |
1380 | { | |
1381 | xfs_caddr_t dptr; /* pointer to byte sized element */ | |
1382 | xfs_buf_t *bp; | |
1383 | int i, ops; | |
1384 | uint count; /* byte count of bwrite */ | |
1385 | uint count_init; /* initial count before roundup */ | |
1386 | int roundoff; /* roundoff to BB or stripe */ | |
1387 | int split = 0; /* split write into two regions */ | |
1388 | int error; | |
1389 | SPLDECL(s); | |
1390 | int v2 = XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb); | |
1391 | ||
1392 | XFS_STATS_INC(xs_log_writes); | |
1393 | ASSERT(iclog->ic_refcnt == 0); | |
1394 | ||
1395 | /* Add for LR header */ | |
1396 | count_init = log->l_iclog_hsize + iclog->ic_offset; | |
1397 | ||
1398 | /* Round out the log write size */ | |
1399 | if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { | |
1400 | /* we have a v2 stripe unit to use */ | |
1401 | count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); | |
1402 | } else { | |
1403 | count = BBTOB(BTOBB(count_init)); | |
1404 | } | |
1405 | roundoff = count - count_init; | |
1406 | ASSERT(roundoff >= 0); | |
1407 | ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && | |
1408 | roundoff < log->l_mp->m_sb.sb_logsunit) | |
1409 | || | |
1410 | (log->l_mp->m_sb.sb_logsunit <= 1 && | |
1411 | roundoff < BBTOB(1))); | |
1412 | ||
1413 | /* move grant heads by roundoff in sync */ | |
1414 | s = GRANT_LOCK(log); | |
1415 | XLOG_GRANT_ADD_SPACE(log, roundoff, 'w'); | |
1416 | XLOG_GRANT_ADD_SPACE(log, roundoff, 'r'); | |
1417 | GRANT_UNLOCK(log, s); | |
1418 | ||
1419 | /* put cycle number in every block */ | |
1420 | xlog_pack_data(log, iclog, roundoff); | |
1421 | ||
1422 | /* real byte length */ | |
1423 | if (v2) { | |
1424 | INT_SET(iclog->ic_header.h_len, | |
1425 | ARCH_CONVERT, | |
1426 | iclog->ic_offset + roundoff); | |
1427 | } else { | |
1428 | INT_SET(iclog->ic_header.h_len, ARCH_CONVERT, iclog->ic_offset); | |
1429 | } | |
1430 | ||
1431 | /* put ops count in correct order */ | |
1432 | ops = iclog->ic_header.h_num_logops; | |
1433 | INT_SET(iclog->ic_header.h_num_logops, ARCH_CONVERT, ops); | |
1434 | ||
1435 | bp = iclog->ic_bp; | |
1436 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); | |
1437 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); | |
1438 | XFS_BUF_SET_ADDR(bp, BLOCK_LSN(INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT))); | |
1439 | ||
1440 | XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); | |
1441 | ||
1442 | /* Do we need to split this write into 2 parts? */ | |
1443 | if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { | |
1444 | split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); | |
1445 | count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); | |
1446 | iclog->ic_bwritecnt = 2; /* split into 2 writes */ | |
1447 | } else { | |
1448 | iclog->ic_bwritecnt = 1; | |
1449 | } | |
1450 | XFS_BUF_SET_PTR(bp, (xfs_caddr_t) &(iclog->ic_header), count); | |
1451 | XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ | |
1452 | XFS_BUF_BUSY(bp); | |
1453 | XFS_BUF_ASYNC(bp); | |
1454 | /* | |
1455 | * Do a disk write cache flush for the log block. | |
1456 | * This is a bit of a sledgehammer, it would be better | |
1457 | * to use a tag barrier here that just prevents reordering. | |
1458 | * It may not be needed to flush the first split block in the log wrap | |
1459 | * case, but do it anyways to be safe -AK | |
1460 | */ | |
1461 | if (!(log->l_mp->m_flags & XFS_MOUNT_NOLOGFLUSH)) | |
1462 | XFS_BUF_FLUSH(bp); | |
1463 | ||
1464 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1465 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1466 | ||
1467 | xlog_verify_iclog(log, iclog, count, B_TRUE); | |
1468 | ||
1469 | /* account for log which doesn't start at block #0 */ | |
1470 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); | |
1471 | /* | |
1472 | * Don't call xfs_bwrite here. We do log-syncs even when the filesystem | |
1473 | * is shutting down. | |
1474 | */ | |
1475 | XFS_BUF_WRITE(bp); | |
1476 | ||
1477 | if ((error = XFS_bwrite(bp))) { | |
1478 | xfs_ioerror_alert("xlog_sync", log->l_mp, bp, | |
1479 | XFS_BUF_ADDR(bp)); | |
1480 | return (error); | |
1481 | } | |
1482 | if (split) { | |
1483 | bp = iclog->ic_log->l_xbuf; | |
1484 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == | |
1485 | (unsigned long)1); | |
1486 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); | |
1487 | XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ | |
1488 | XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ | |
1489 | (__psint_t)count), split); | |
1490 | XFS_BUF_SET_FSPRIVATE(bp, iclog); | |
1491 | XFS_BUF_BUSY(bp); | |
1492 | XFS_BUF_ASYNC(bp); | |
1493 | if (!(log->l_mp->m_flags & XFS_MOUNT_NOLOGFLUSH)) | |
1494 | XFS_BUF_FLUSH(bp); | |
1495 | dptr = XFS_BUF_PTR(bp); | |
1496 | /* | |
1497 | * Bump the cycle numbers at the start of each block | |
1498 | * since this part of the buffer is at the start of | |
1499 | * a new cycle. Watch out for the header magic number | |
1500 | * case, though. | |
1501 | */ | |
1502 | for (i=0; i<split; i += BBSIZE) { | |
1503 | INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); | |
1504 | if (INT_GET(*(uint *)dptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) | |
1505 | INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1); | |
1506 | dptr += BBSIZE; | |
1507 | } | |
1508 | ||
1509 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1510 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1511 | ||
1512 | /* account for internal log which does't start at block #0 */ | |
1513 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); | |
1514 | XFS_BUF_WRITE(bp); | |
1515 | if ((error = XFS_bwrite(bp))) { | |
1516 | xfs_ioerror_alert("xlog_sync (split)", log->l_mp, | |
1517 | bp, XFS_BUF_ADDR(bp)); | |
1518 | return (error); | |
1519 | } | |
1520 | } | |
1521 | return (0); | |
1522 | } /* xlog_sync */ | |
1523 | ||
1524 | ||
1525 | /* | |
1526 | * Unallocate a log structure | |
1527 | */ | |
1528 | void | |
1529 | xlog_unalloc_log(xlog_t *log) | |
1530 | { | |
1531 | xlog_in_core_t *iclog, *next_iclog; | |
1532 | xlog_ticket_t *tic, *next_tic; | |
1533 | int i; | |
1534 | ||
1535 | ||
1536 | iclog = log->l_iclog; | |
1537 | for (i=0; i<log->l_iclog_bufs; i++) { | |
1538 | sv_destroy(&iclog->ic_forcesema); | |
1539 | sv_destroy(&iclog->ic_writesema); | |
1540 | xfs_buf_free(iclog->ic_bp); | |
1541 | #ifdef XFS_LOG_TRACE | |
1542 | if (iclog->ic_trace != NULL) { | |
1543 | ktrace_free(iclog->ic_trace); | |
1544 | } | |
1545 | #endif | |
1546 | next_iclog = iclog->ic_next; | |
1547 | kmem_free(iclog->hic_data, log->l_iclog_size); | |
1548 | kmem_free(iclog, sizeof(xlog_in_core_t)); | |
1549 | iclog = next_iclog; | |
1550 | } | |
1551 | freesema(&log->l_flushsema); | |
1552 | spinlock_destroy(&log->l_icloglock); | |
1553 | spinlock_destroy(&log->l_grant_lock); | |
1554 | ||
1555 | /* XXXsup take a look at this again. */ | |
1556 | if ((log->l_ticket_cnt != log->l_ticket_tcnt) && | |
1557 | !XLOG_FORCED_SHUTDOWN(log)) { | |
1558 | xfs_fs_cmn_err(CE_WARN, log->l_mp, | |
1559 | "xlog_unalloc_log: (cnt: %d, total: %d)", | |
1560 | log->l_ticket_cnt, log->l_ticket_tcnt); | |
1561 | /* ASSERT(log->l_ticket_cnt == log->l_ticket_tcnt); */ | |
1562 | ||
1563 | } else { | |
1564 | tic = log->l_unmount_free; | |
1565 | while (tic) { | |
1566 | next_tic = tic->t_next; | |
1567 | kmem_free(tic, NBPP); | |
1568 | tic = next_tic; | |
1569 | } | |
1570 | } | |
1571 | xfs_buf_free(log->l_xbuf); | |
1572 | #ifdef XFS_LOG_TRACE | |
1573 | if (log->l_trace != NULL) { | |
1574 | ktrace_free(log->l_trace); | |
1575 | } | |
1576 | if (log->l_grant_trace != NULL) { | |
1577 | ktrace_free(log->l_grant_trace); | |
1578 | } | |
1579 | #endif | |
1580 | log->l_mp->m_log = NULL; | |
1581 | kmem_free(log, sizeof(xlog_t)); | |
1582 | } /* xlog_unalloc_log */ | |
1583 | ||
1584 | /* | |
1585 | * Update counters atomically now that memcpy is done. | |
1586 | */ | |
1587 | /* ARGSUSED */ | |
1588 | static inline void | |
1589 | xlog_state_finish_copy(xlog_t *log, | |
1590 | xlog_in_core_t *iclog, | |
1591 | int record_cnt, | |
1592 | int copy_bytes) | |
1593 | { | |
1594 | SPLDECL(s); | |
1595 | ||
1596 | s = LOG_LOCK(log); | |
1597 | ||
1598 | iclog->ic_header.h_num_logops += record_cnt; | |
1599 | iclog->ic_offset += copy_bytes; | |
1600 | ||
1601 | LOG_UNLOCK(log, s); | |
1602 | } /* xlog_state_finish_copy */ | |
1603 | ||
1604 | ||
1605 | ||
1606 | ||
1607 | /* | |
1608 | * Write some region out to in-core log | |
1609 | * | |
1610 | * This will be called when writing externally provided regions or when | |
1611 | * writing out a commit record for a given transaction. | |
1612 | * | |
1613 | * General algorithm: | |
1614 | * 1. Find total length of this write. This may include adding to the | |
1615 | * lengths passed in. | |
1616 | * 2. Check whether we violate the tickets reservation. | |
1617 | * 3. While writing to this iclog | |
1618 | * A. Reserve as much space in this iclog as can get | |
1619 | * B. If this is first write, save away start lsn | |
1620 | * C. While writing this region: | |
1621 | * 1. If first write of transaction, write start record | |
1622 | * 2. Write log operation header (header per region) | |
1623 | * 3. Find out if we can fit entire region into this iclog | |
1624 | * 4. Potentially, verify destination memcpy ptr | |
1625 | * 5. Memcpy (partial) region | |
1626 | * 6. If partial copy, release iclog; otherwise, continue | |
1627 | * copying more regions into current iclog | |
1628 | * 4. Mark want sync bit (in simulation mode) | |
1629 | * 5. Release iclog for potential flush to on-disk log. | |
1630 | * | |
1631 | * ERRORS: | |
1632 | * 1. Panic if reservation is overrun. This should never happen since | |
1633 | * reservation amounts are generated internal to the filesystem. | |
1634 | * NOTES: | |
1635 | * 1. Tickets are single threaded data structures. | |
1636 | * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the | |
1637 | * syncing routine. When a single log_write region needs to span | |
1638 | * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set | |
1639 | * on all log operation writes which don't contain the end of the | |
1640 | * region. The XLOG_END_TRANS bit is used for the in-core log | |
1641 | * operation which contains the end of the continued log_write region. | |
1642 | * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, | |
1643 | * we don't really know exactly how much space will be used. As a result, | |
1644 | * we don't update ic_offset until the end when we know exactly how many | |
1645 | * bytes have been written out. | |
1646 | */ | |
1647 | int | |
1648 | xlog_write(xfs_mount_t * mp, | |
1649 | xfs_log_iovec_t reg[], | |
1650 | int nentries, | |
1651 | xfs_log_ticket_t tic, | |
1652 | xfs_lsn_t *start_lsn, | |
1653 | xlog_in_core_t **commit_iclog, | |
1654 | uint flags) | |
1655 | { | |
1656 | xlog_t *log = mp->m_log; | |
1657 | xlog_ticket_t *ticket = (xlog_ticket_t *)tic; | |
1658 | xlog_op_header_t *logop_head; /* ptr to log operation header */ | |
1659 | xlog_in_core_t *iclog; /* ptr to current in-core log */ | |
1660 | __psint_t ptr; /* copy address into data region */ | |
1661 | int len; /* # xlog_write() bytes 2 still copy */ | |
1662 | int index; /* region index currently copying */ | |
1663 | int log_offset; /* offset (from 0) into data region */ | |
1664 | int start_rec_copy; /* # bytes to copy for start record */ | |
1665 | int partial_copy; /* did we split a region? */ | |
1666 | int partial_copy_len;/* # bytes copied if split region */ | |
1667 | int need_copy; /* # bytes need to memcpy this region */ | |
1668 | int copy_len; /* # bytes actually memcpy'ing */ | |
1669 | int copy_off; /* # bytes from entry start */ | |
1670 | int contwr; /* continued write of in-core log? */ | |
1671 | int error; | |
1672 | int record_cnt = 0, data_cnt = 0; | |
1673 | ||
1674 | partial_copy_len = partial_copy = 0; | |
1675 | ||
1676 | /* Calculate potential maximum space. Each region gets its own | |
1677 | * xlog_op_header_t and may need to be double word aligned. | |
1678 | */ | |
1679 | len = 0; | |
1680 | if (ticket->t_flags & XLOG_TIC_INITED) /* acct for start rec of xact */ | |
1681 | len += sizeof(xlog_op_header_t); | |
1682 | ||
1683 | for (index = 0; index < nentries; index++) { | |
1684 | len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ | |
1685 | len += reg[index].i_len; | |
1686 | } | |
1687 | contwr = *start_lsn = 0; | |
1688 | ||
1689 | if (ticket->t_curr_res < len) { | |
1690 | #ifdef DEBUG | |
1691 | xlog_panic( | |
1692 | "xfs_log_write: reservation ran out. Need to up reservation"); | |
1693 | #else | |
1694 | /* Customer configurable panic */ | |
1695 | xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, | |
1696 | "xfs_log_write: reservation ran out. Need to up reservation"); | |
1697 | /* If we did not panic, shutdown the filesystem */ | |
1698 | xfs_force_shutdown(mp, XFS_CORRUPT_INCORE); | |
1699 | #endif | |
1700 | } else | |
1701 | ticket->t_curr_res -= len; | |
1702 | ||
1703 | for (index = 0; index < nentries; ) { | |
1704 | if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, | |
1705 | &contwr, &log_offset))) | |
1706 | return (error); | |
1707 | ||
1708 | ASSERT(log_offset <= iclog->ic_size - 1); | |
1709 | ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset); | |
1710 | ||
1711 | /* start_lsn is the first lsn written to. That's all we need. */ | |
1712 | if (! *start_lsn) | |
1713 | *start_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); | |
1714 | ||
1715 | /* This loop writes out as many regions as can fit in the amount | |
1716 | * of space which was allocated by xlog_state_get_iclog_space(). | |
1717 | */ | |
1718 | while (index < nentries) { | |
1719 | ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); | |
1720 | ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); | |
1721 | start_rec_copy = 0; | |
1722 | ||
1723 | /* If first write for transaction, insert start record. | |
1724 | * We can't be trying to commit if we are inited. We can't | |
1725 | * have any "partial_copy" if we are inited. | |
1726 | */ | |
1727 | if (ticket->t_flags & XLOG_TIC_INITED) { | |
1728 | logop_head = (xlog_op_header_t *)ptr; | |
1729 | INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); | |
1730 | logop_head->oh_clientid = ticket->t_clientid; | |
1731 | logop_head->oh_len = 0; | |
1732 | logop_head->oh_flags = XLOG_START_TRANS; | |
1733 | logop_head->oh_res2 = 0; | |
1734 | ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ | |
1735 | record_cnt++; | |
1736 | ||
1737 | start_rec_copy = sizeof(xlog_op_header_t); | |
1738 | xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); | |
1739 | } | |
1740 | ||
1741 | /* Copy log operation header directly into data section */ | |
1742 | logop_head = (xlog_op_header_t *)ptr; | |
1743 | INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid); | |
1744 | logop_head->oh_clientid = ticket->t_clientid; | |
1745 | logop_head->oh_res2 = 0; | |
1746 | ||
1747 | /* header copied directly */ | |
1748 | xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); | |
1749 | ||
1750 | /* are we copying a commit or unmount record? */ | |
1751 | logop_head->oh_flags = flags; | |
1752 | ||
1753 | /* | |
1754 | * We've seen logs corrupted with bad transaction client | |
1755 | * ids. This makes sure that XFS doesn't generate them on. | |
1756 | * Turn this into an EIO and shut down the filesystem. | |
1757 | */ | |
1758 | switch (logop_head->oh_clientid) { | |
1759 | case XFS_TRANSACTION: | |
1760 | case XFS_VOLUME: | |
1761 | case XFS_LOG: | |
1762 | break; | |
1763 | default: | |
1764 | xfs_fs_cmn_err(CE_WARN, mp, | |
1765 | "Bad XFS transaction clientid 0x%x in ticket 0x%p", | |
1766 | logop_head->oh_clientid, tic); | |
1767 | return XFS_ERROR(EIO); | |
1768 | } | |
1769 | ||
1770 | /* Partial write last time? => (partial_copy != 0) | |
1771 | * need_copy is the amount we'd like to copy if everything could | |
1772 | * fit in the current memcpy. | |
1773 | */ | |
1774 | need_copy = reg[index].i_len - partial_copy_len; | |
1775 | ||
1776 | copy_off = partial_copy_len; | |
1777 | if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ | |
1778 | INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len = need_copy); | |
1779 | if (partial_copy) | |
1780 | logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); | |
1781 | partial_copy_len = partial_copy = 0; | |
1782 | } else { /* partial write */ | |
1783 | copy_len = iclog->ic_size - log_offset; | |
1784 | INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len); | |
1785 | logop_head->oh_flags |= XLOG_CONTINUE_TRANS; | |
1786 | if (partial_copy) | |
1787 | logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; | |
1788 | partial_copy_len += copy_len; | |
1789 | partial_copy++; | |
1790 | len += sizeof(xlog_op_header_t); /* from splitting of region */ | |
1791 | /* account for new log op header */ | |
1792 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
1793 | } | |
1794 | xlog_verify_dest_ptr(log, ptr); | |
1795 | ||
1796 | /* copy region */ | |
1797 | ASSERT(copy_len >= 0); | |
1798 | memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); | |
1799 | xlog_write_adv_cnt(ptr, len, log_offset, copy_len); | |
1800 | ||
1801 | /* make copy_len total bytes copied, including headers */ | |
1802 | copy_len += start_rec_copy + sizeof(xlog_op_header_t); | |
1803 | record_cnt++; | |
1804 | data_cnt += contwr ? copy_len : 0; | |
1805 | if (partial_copy) { /* copied partial region */ | |
1806 | /* already marked WANT_SYNC by xlog_state_get_iclog_space */ | |
1807 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
1808 | record_cnt = data_cnt = 0; | |
1809 | if ((error = xlog_state_release_iclog(log, iclog))) | |
1810 | return (error); | |
1811 | break; /* don't increment index */ | |
1812 | } else { /* copied entire region */ | |
1813 | index++; | |
1814 | partial_copy_len = partial_copy = 0; | |
1815 | ||
1816 | if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { | |
1817 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
1818 | record_cnt = data_cnt = 0; | |
1819 | xlog_state_want_sync(log, iclog); | |
1820 | if (commit_iclog) { | |
1821 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
1822 | *commit_iclog = iclog; | |
1823 | } else if ((error = xlog_state_release_iclog(log, iclog))) | |
1824 | return (error); | |
1825 | if (index == nentries) | |
1826 | return 0; /* we are done */ | |
1827 | else | |
1828 | break; | |
1829 | } | |
1830 | } /* if (partial_copy) */ | |
1831 | } /* while (index < nentries) */ | |
1832 | } /* for (index = 0; index < nentries; ) */ | |
1833 | ASSERT(len == 0); | |
1834 | ||
1835 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
1836 | if (commit_iclog) { | |
1837 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
1838 | *commit_iclog = iclog; | |
1839 | return 0; | |
1840 | } | |
1841 | return (xlog_state_release_iclog(log, iclog)); | |
1842 | } /* xlog_write */ | |
1843 | ||
1844 | ||
1845 | /***************************************************************************** | |
1846 | * | |
1847 | * State Machine functions | |
1848 | * | |
1849 | ***************************************************************************** | |
1850 | */ | |
1851 | ||
1852 | /* Clean iclogs starting from the head. This ordering must be | |
1853 | * maintained, so an iclog doesn't become ACTIVE beyond one that | |
1854 | * is SYNCING. This is also required to maintain the notion that we use | |
1855 | * a counting semaphore to hold off would be writers to the log when every | |
1856 | * iclog is trying to sync to disk. | |
1857 | * | |
1858 | * State Change: DIRTY -> ACTIVE | |
1859 | */ | |
ba0f32d4 | 1860 | STATIC void |
1da177e4 LT |
1861 | xlog_state_clean_log(xlog_t *log) |
1862 | { | |
1863 | xlog_in_core_t *iclog; | |
1864 | int changed = 0; | |
1865 | ||
1866 | iclog = log->l_iclog; | |
1867 | do { | |
1868 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
1869 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
1870 | iclog->ic_offset = 0; | |
1871 | iclog->ic_callback = NULL; /* don't need to free */ | |
1872 | /* | |
1873 | * If the number of ops in this iclog indicate it just | |
1874 | * contains the dummy transaction, we can | |
1875 | * change state into IDLE (the second time around). | |
1876 | * Otherwise we should change the state into | |
1877 | * NEED a dummy. | |
1878 | * We don't need to cover the dummy. | |
1879 | */ | |
1880 | if (!changed && | |
1881 | (INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT) == XLOG_COVER_OPS)) { | |
1882 | changed = 1; | |
1883 | } else { | |
1884 | /* | |
1885 | * We have two dirty iclogs so start over | |
1886 | * This could also be num of ops indicates | |
1887 | * this is not the dummy going out. | |
1888 | */ | |
1889 | changed = 2; | |
1890 | } | |
1891 | iclog->ic_header.h_num_logops = 0; | |
1892 | memset(iclog->ic_header.h_cycle_data, 0, | |
1893 | sizeof(iclog->ic_header.h_cycle_data)); | |
1894 | iclog->ic_header.h_lsn = 0; | |
1895 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) | |
1896 | /* do nothing */; | |
1897 | else | |
1898 | break; /* stop cleaning */ | |
1899 | iclog = iclog->ic_next; | |
1900 | } while (iclog != log->l_iclog); | |
1901 | ||
1902 | /* log is locked when we are called */ | |
1903 | /* | |
1904 | * Change state for the dummy log recording. | |
1905 | * We usually go to NEED. But we go to NEED2 if the changed indicates | |
1906 | * we are done writing the dummy record. | |
1907 | * If we are done with the second dummy recored (DONE2), then | |
1908 | * we go to IDLE. | |
1909 | */ | |
1910 | if (changed) { | |
1911 | switch (log->l_covered_state) { | |
1912 | case XLOG_STATE_COVER_IDLE: | |
1913 | case XLOG_STATE_COVER_NEED: | |
1914 | case XLOG_STATE_COVER_NEED2: | |
1915 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
1916 | break; | |
1917 | ||
1918 | case XLOG_STATE_COVER_DONE: | |
1919 | if (changed == 1) | |
1920 | log->l_covered_state = XLOG_STATE_COVER_NEED2; | |
1921 | else | |
1922 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
1923 | break; | |
1924 | ||
1925 | case XLOG_STATE_COVER_DONE2: | |
1926 | if (changed == 1) | |
1927 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1928 | else | |
1929 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
1930 | break; | |
1931 | ||
1932 | default: | |
1933 | ASSERT(0); | |
1934 | } | |
1935 | } | |
1936 | } /* xlog_state_clean_log */ | |
1937 | ||
1938 | STATIC xfs_lsn_t | |
1939 | xlog_get_lowest_lsn( | |
1940 | xlog_t *log) | |
1941 | { | |
1942 | xlog_in_core_t *lsn_log; | |
1943 | xfs_lsn_t lowest_lsn, lsn; | |
1944 | ||
1945 | lsn_log = log->l_iclog; | |
1946 | lowest_lsn = 0; | |
1947 | do { | |
1948 | if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { | |
1949 | lsn = INT_GET(lsn_log->ic_header.h_lsn, ARCH_CONVERT); | |
1950 | if ((lsn && !lowest_lsn) || | |
1951 | (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { | |
1952 | lowest_lsn = lsn; | |
1953 | } | |
1954 | } | |
1955 | lsn_log = lsn_log->ic_next; | |
1956 | } while (lsn_log != log->l_iclog); | |
1957 | return(lowest_lsn); | |
1958 | } | |
1959 | ||
1960 | ||
1961 | STATIC void | |
1962 | xlog_state_do_callback( | |
1963 | xlog_t *log, | |
1964 | int aborted, | |
1965 | xlog_in_core_t *ciclog) | |
1966 | { | |
1967 | xlog_in_core_t *iclog; | |
1968 | xlog_in_core_t *first_iclog; /* used to know when we've | |
1969 | * processed all iclogs once */ | |
1970 | xfs_log_callback_t *cb, *cb_next; | |
1971 | int flushcnt = 0; | |
1972 | xfs_lsn_t lowest_lsn; | |
1973 | int ioerrors; /* counter: iclogs with errors */ | |
1974 | int loopdidcallbacks; /* flag: inner loop did callbacks*/ | |
1975 | int funcdidcallbacks; /* flag: function did callbacks */ | |
1976 | int repeats; /* for issuing console warnings if | |
1977 | * looping too many times */ | |
1978 | SPLDECL(s); | |
1979 | ||
1980 | s = LOG_LOCK(log); | |
1981 | first_iclog = iclog = log->l_iclog; | |
1982 | ioerrors = 0; | |
1983 | funcdidcallbacks = 0; | |
1984 | repeats = 0; | |
1985 | ||
1986 | do { | |
1987 | /* | |
1988 | * Scan all iclogs starting with the one pointed to by the | |
1989 | * log. Reset this starting point each time the log is | |
1990 | * unlocked (during callbacks). | |
1991 | * | |
1992 | * Keep looping through iclogs until one full pass is made | |
1993 | * without running any callbacks. | |
1994 | */ | |
1995 | first_iclog = log->l_iclog; | |
1996 | iclog = log->l_iclog; | |
1997 | loopdidcallbacks = 0; | |
1998 | repeats++; | |
1999 | ||
2000 | do { | |
2001 | ||
2002 | /* skip all iclogs in the ACTIVE & DIRTY states */ | |
2003 | if (iclog->ic_state & | |
2004 | (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { | |
2005 | iclog = iclog->ic_next; | |
2006 | continue; | |
2007 | } | |
2008 | ||
2009 | /* | |
2010 | * Between marking a filesystem SHUTDOWN and stopping | |
2011 | * the log, we do flush all iclogs to disk (if there | |
2012 | * wasn't a log I/O error). So, we do want things to | |
2013 | * go smoothly in case of just a SHUTDOWN w/o a | |
2014 | * LOG_IO_ERROR. | |
2015 | */ | |
2016 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
2017 | /* | |
2018 | * Can only perform callbacks in order. Since | |
2019 | * this iclog is not in the DONE_SYNC/ | |
2020 | * DO_CALLBACK state, we skip the rest and | |
2021 | * just try to clean up. If we set our iclog | |
2022 | * to DO_CALLBACK, we will not process it when | |
2023 | * we retry since a previous iclog is in the | |
2024 | * CALLBACK and the state cannot change since | |
2025 | * we are holding the LOG_LOCK. | |
2026 | */ | |
2027 | if (!(iclog->ic_state & | |
2028 | (XLOG_STATE_DONE_SYNC | | |
2029 | XLOG_STATE_DO_CALLBACK))) { | |
2030 | if (ciclog && (ciclog->ic_state == | |
2031 | XLOG_STATE_DONE_SYNC)) { | |
2032 | ciclog->ic_state = XLOG_STATE_DO_CALLBACK; | |
2033 | } | |
2034 | break; | |
2035 | } | |
2036 | /* | |
2037 | * We now have an iclog that is in either the | |
2038 | * DO_CALLBACK or DONE_SYNC states. The other | |
2039 | * states (WANT_SYNC, SYNCING, or CALLBACK were | |
2040 | * caught by the above if and are going to | |
2041 | * clean (i.e. we aren't doing their callbacks) | |
2042 | * see the above if. | |
2043 | */ | |
2044 | ||
2045 | /* | |
2046 | * We will do one more check here to see if we | |
2047 | * have chased our tail around. | |
2048 | */ | |
2049 | ||
2050 | lowest_lsn = xlog_get_lowest_lsn(log); | |
2051 | if (lowest_lsn && ( | |
2052 | XFS_LSN_CMP( | |
2053 | lowest_lsn, | |
2054 | INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) | |
2055 | )<0)) { | |
2056 | iclog = iclog->ic_next; | |
2057 | continue; /* Leave this iclog for | |
2058 | * another thread */ | |
2059 | } | |
2060 | ||
2061 | iclog->ic_state = XLOG_STATE_CALLBACK; | |
2062 | ||
2063 | LOG_UNLOCK(log, s); | |
2064 | ||
2065 | /* l_last_sync_lsn field protected by | |
2066 | * GRANT_LOCK. Don't worry about iclog's lsn. | |
2067 | * No one else can be here except us. | |
2068 | */ | |
2069 | s = GRANT_LOCK(log); | |
2070 | ASSERT(XFS_LSN_CMP( | |
2071 | log->l_last_sync_lsn, | |
2072 | INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) | |
2073 | )<=0); | |
2074 | log->l_last_sync_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); | |
2075 | GRANT_UNLOCK(log, s); | |
2076 | ||
2077 | /* | |
2078 | * Keep processing entries in the callback list | |
2079 | * until we come around and it is empty. We | |
2080 | * need to atomically see that the list is | |
2081 | * empty and change the state to DIRTY so that | |
2082 | * we don't miss any more callbacks being added. | |
2083 | */ | |
2084 | s = LOG_LOCK(log); | |
2085 | } else { | |
2086 | ioerrors++; | |
2087 | } | |
2088 | cb = iclog->ic_callback; | |
2089 | ||
2090 | while (cb != 0) { | |
2091 | iclog->ic_callback_tail = &(iclog->ic_callback); | |
2092 | iclog->ic_callback = NULL; | |
2093 | LOG_UNLOCK(log, s); | |
2094 | ||
2095 | /* perform callbacks in the order given */ | |
2096 | for (; cb != 0; cb = cb_next) { | |
2097 | cb_next = cb->cb_next; | |
2098 | cb->cb_func(cb->cb_arg, aborted); | |
2099 | } | |
2100 | s = LOG_LOCK(log); | |
2101 | cb = iclog->ic_callback; | |
2102 | } | |
2103 | ||
2104 | loopdidcallbacks++; | |
2105 | funcdidcallbacks++; | |
2106 | ||
2107 | ASSERT(iclog->ic_callback == 0); | |
2108 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) | |
2109 | iclog->ic_state = XLOG_STATE_DIRTY; | |
2110 | ||
2111 | /* | |
2112 | * Transition from DIRTY to ACTIVE if applicable. | |
2113 | * NOP if STATE_IOERROR. | |
2114 | */ | |
2115 | xlog_state_clean_log(log); | |
2116 | ||
2117 | /* wake up threads waiting in xfs_log_force() */ | |
2118 | sv_broadcast(&iclog->ic_forcesema); | |
2119 | ||
2120 | iclog = iclog->ic_next; | |
2121 | } while (first_iclog != iclog); | |
2122 | if (repeats && (repeats % 10) == 0) { | |
2123 | xfs_fs_cmn_err(CE_WARN, log->l_mp, | |
2124 | "xlog_state_do_callback: looping %d", repeats); | |
2125 | } | |
2126 | } while (!ioerrors && loopdidcallbacks); | |
2127 | ||
2128 | /* | |
2129 | * make one last gasp attempt to see if iclogs are being left in | |
2130 | * limbo.. | |
2131 | */ | |
2132 | #ifdef DEBUG | |
2133 | if (funcdidcallbacks) { | |
2134 | first_iclog = iclog = log->l_iclog; | |
2135 | do { | |
2136 | ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); | |
2137 | /* | |
2138 | * Terminate the loop if iclogs are found in states | |
2139 | * which will cause other threads to clean up iclogs. | |
2140 | * | |
2141 | * SYNCING - i/o completion will go through logs | |
2142 | * DONE_SYNC - interrupt thread should be waiting for | |
2143 | * LOG_LOCK | |
2144 | * IOERROR - give up hope all ye who enter here | |
2145 | */ | |
2146 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC || | |
2147 | iclog->ic_state == XLOG_STATE_SYNCING || | |
2148 | iclog->ic_state == XLOG_STATE_DONE_SYNC || | |
2149 | iclog->ic_state == XLOG_STATE_IOERROR ) | |
2150 | break; | |
2151 | iclog = iclog->ic_next; | |
2152 | } while (first_iclog != iclog); | |
2153 | } | |
2154 | #endif | |
2155 | ||
2156 | if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) { | |
2157 | flushcnt = log->l_flushcnt; | |
2158 | log->l_flushcnt = 0; | |
2159 | } | |
2160 | LOG_UNLOCK(log, s); | |
2161 | while (flushcnt--) | |
2162 | vsema(&log->l_flushsema); | |
2163 | } /* xlog_state_do_callback */ | |
2164 | ||
2165 | ||
2166 | /* | |
2167 | * Finish transitioning this iclog to the dirty state. | |
2168 | * | |
2169 | * Make sure that we completely execute this routine only when this is | |
2170 | * the last call to the iclog. There is a good chance that iclog flushes, | |
2171 | * when we reach the end of the physical log, get turned into 2 separate | |
2172 | * calls to bwrite. Hence, one iclog flush could generate two calls to this | |
2173 | * routine. By using the reference count bwritecnt, we guarantee that only | |
2174 | * the second completion goes through. | |
2175 | * | |
2176 | * Callbacks could take time, so they are done outside the scope of the | |
2177 | * global state machine log lock. Assume that the calls to cvsema won't | |
2178 | * take a long time. At least we know it won't sleep. | |
2179 | */ | |
2180 | void | |
2181 | xlog_state_done_syncing( | |
2182 | xlog_in_core_t *iclog, | |
2183 | int aborted) | |
2184 | { | |
2185 | xlog_t *log = iclog->ic_log; | |
2186 | SPLDECL(s); | |
2187 | ||
2188 | s = LOG_LOCK(log); | |
2189 | ||
2190 | ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || | |
2191 | iclog->ic_state == XLOG_STATE_IOERROR); | |
2192 | ASSERT(iclog->ic_refcnt == 0); | |
2193 | ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); | |
2194 | ||
2195 | ||
2196 | /* | |
2197 | * If we got an error, either on the first buffer, or in the case of | |
2198 | * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, | |
2199 | * and none should ever be attempted to be written to disk | |
2200 | * again. | |
2201 | */ | |
2202 | if (iclog->ic_state != XLOG_STATE_IOERROR) { | |
2203 | if (--iclog->ic_bwritecnt == 1) { | |
2204 | LOG_UNLOCK(log, s); | |
2205 | return; | |
2206 | } | |
2207 | iclog->ic_state = XLOG_STATE_DONE_SYNC; | |
2208 | } | |
2209 | ||
2210 | /* | |
2211 | * Someone could be sleeping prior to writing out the next | |
2212 | * iclog buffer, we wake them all, one will get to do the | |
2213 | * I/O, the others get to wait for the result. | |
2214 | */ | |
2215 | sv_broadcast(&iclog->ic_writesema); | |
2216 | LOG_UNLOCK(log, s); | |
2217 | xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ | |
2218 | } /* xlog_state_done_syncing */ | |
2219 | ||
2220 | ||
2221 | /* | |
2222 | * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must | |
2223 | * sleep. The flush semaphore is set to the number of in-core buffers and | |
2224 | * decremented around disk syncing. Therefore, if all buffers are syncing, | |
2225 | * this semaphore will cause new writes to sleep until a sync completes. | |
2226 | * Otherwise, this code just does p() followed by v(). This approximates | |
2227 | * a sleep/wakeup except we can't race. | |
2228 | * | |
2229 | * The in-core logs are used in a circular fashion. They are not used | |
2230 | * out-of-order even when an iclog past the head is free. | |
2231 | * | |
2232 | * return: | |
2233 | * * log_offset where xlog_write() can start writing into the in-core | |
2234 | * log's data space. | |
2235 | * * in-core log pointer to which xlog_write() should write. | |
2236 | * * boolean indicating this is a continued write to an in-core log. | |
2237 | * If this is the last write, then the in-core log's offset field | |
2238 | * needs to be incremented, depending on the amount of data which | |
2239 | * is copied. | |
2240 | */ | |
2241 | int | |
2242 | xlog_state_get_iclog_space(xlog_t *log, | |
2243 | int len, | |
2244 | xlog_in_core_t **iclogp, | |
2245 | xlog_ticket_t *ticket, | |
2246 | int *continued_write, | |
2247 | int *logoffsetp) | |
2248 | { | |
2249 | SPLDECL(s); | |
2250 | int log_offset; | |
2251 | xlog_rec_header_t *head; | |
2252 | xlog_in_core_t *iclog; | |
2253 | int error; | |
2254 | ||
2255 | restart: | |
2256 | s = LOG_LOCK(log); | |
2257 | if (XLOG_FORCED_SHUTDOWN(log)) { | |
2258 | LOG_UNLOCK(log, s); | |
2259 | return XFS_ERROR(EIO); | |
2260 | } | |
2261 | ||
2262 | iclog = log->l_iclog; | |
2263 | if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) { | |
2264 | log->l_flushcnt++; | |
2265 | LOG_UNLOCK(log, s); | |
2266 | xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH); | |
2267 | XFS_STATS_INC(xs_log_noiclogs); | |
2268 | /* Ensure that log writes happen */ | |
2269 | psema(&log->l_flushsema, PINOD); | |
2270 | goto restart; | |
2271 | } | |
2272 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
2273 | head = &iclog->ic_header; | |
2274 | ||
2275 | iclog->ic_refcnt++; /* prevents sync */ | |
2276 | log_offset = iclog->ic_offset; | |
2277 | ||
2278 | /* On the 1st write to an iclog, figure out lsn. This works | |
2279 | * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are | |
2280 | * committing to. If the offset is set, that's how many blocks | |
2281 | * must be written. | |
2282 | */ | |
2283 | if (log_offset == 0) { | |
2284 | ticket->t_curr_res -= log->l_iclog_hsize; | |
2285 | INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle); | |
2286 | ASSIGN_LSN(head->h_lsn, log); | |
2287 | ASSERT(log->l_curr_block >= 0); | |
2288 | } | |
2289 | ||
2290 | /* If there is enough room to write everything, then do it. Otherwise, | |
2291 | * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC | |
2292 | * bit is on, so this will get flushed out. Don't update ic_offset | |
2293 | * until you know exactly how many bytes get copied. Therefore, wait | |
2294 | * until later to update ic_offset. | |
2295 | * | |
2296 | * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's | |
2297 | * can fit into remaining data section. | |
2298 | */ | |
2299 | if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { | |
2300 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2301 | ||
2302 | /* If I'm the only one writing to this iclog, sync it to disk */ | |
2303 | if (iclog->ic_refcnt == 1) { | |
2304 | LOG_UNLOCK(log, s); | |
2305 | if ((error = xlog_state_release_iclog(log, iclog))) | |
2306 | return (error); | |
2307 | } else { | |
2308 | iclog->ic_refcnt--; | |
2309 | LOG_UNLOCK(log, s); | |
2310 | } | |
2311 | goto restart; | |
2312 | } | |
2313 | ||
2314 | /* Do we have enough room to write the full amount in the remainder | |
2315 | * of this iclog? Or must we continue a write on the next iclog and | |
2316 | * mark this iclog as completely taken? In the case where we switch | |
2317 | * iclogs (to mark it taken), this particular iclog will release/sync | |
2318 | * to disk in xlog_write(). | |
2319 | */ | |
2320 | if (len <= iclog->ic_size - iclog->ic_offset) { | |
2321 | *continued_write = 0; | |
2322 | iclog->ic_offset += len; | |
2323 | } else { | |
2324 | *continued_write = 1; | |
2325 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2326 | } | |
2327 | *iclogp = iclog; | |
2328 | ||
2329 | ASSERT(iclog->ic_offset <= iclog->ic_size); | |
2330 | LOG_UNLOCK(log, s); | |
2331 | ||
2332 | *logoffsetp = log_offset; | |
2333 | return 0; | |
2334 | } /* xlog_state_get_iclog_space */ | |
2335 | ||
2336 | /* | |
2337 | * Atomically get the log space required for a log ticket. | |
2338 | * | |
2339 | * Once a ticket gets put onto the reserveq, it will only return after | |
2340 | * the needed reservation is satisfied. | |
2341 | */ | |
2342 | STATIC int | |
2343 | xlog_grant_log_space(xlog_t *log, | |
2344 | xlog_ticket_t *tic) | |
2345 | { | |
2346 | int free_bytes; | |
2347 | int need_bytes; | |
2348 | SPLDECL(s); | |
2349 | #ifdef DEBUG | |
2350 | xfs_lsn_t tail_lsn; | |
2351 | #endif | |
2352 | ||
2353 | ||
2354 | #ifdef DEBUG | |
2355 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
2356 | panic("grant Recovery problem"); | |
2357 | #endif | |
2358 | ||
2359 | /* Is there space or do we need to sleep? */ | |
2360 | s = GRANT_LOCK(log); | |
2361 | xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter"); | |
2362 | ||
2363 | /* something is already sleeping; insert new transaction at end */ | |
2364 | if (log->l_reserve_headq) { | |
2365 | XLOG_INS_TICKETQ(log->l_reserve_headq, tic); | |
2366 | xlog_trace_loggrant(log, tic, | |
2367 | "xlog_grant_log_space: sleep 1"); | |
2368 | /* | |
2369 | * Gotta check this before going to sleep, while we're | |
2370 | * holding the grant lock. | |
2371 | */ | |
2372 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2373 | goto error_return; | |
2374 | ||
2375 | XFS_STATS_INC(xs_sleep_logspace); | |
2376 | sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); | |
2377 | /* | |
2378 | * If we got an error, and the filesystem is shutting down, | |
2379 | * we'll catch it down below. So just continue... | |
2380 | */ | |
2381 | xlog_trace_loggrant(log, tic, | |
2382 | "xlog_grant_log_space: wake 1"); | |
2383 | s = GRANT_LOCK(log); | |
2384 | } | |
2385 | if (tic->t_flags & XFS_LOG_PERM_RESERV) | |
2386 | need_bytes = tic->t_unit_res*tic->t_ocnt; | |
2387 | else | |
2388 | need_bytes = tic->t_unit_res; | |
2389 | ||
2390 | redo: | |
2391 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2392 | goto error_return; | |
2393 | ||
2394 | free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, | |
2395 | log->l_grant_reserve_bytes); | |
2396 | if (free_bytes < need_bytes) { | |
2397 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
2398 | XLOG_INS_TICKETQ(log->l_reserve_headq, tic); | |
2399 | xlog_trace_loggrant(log, tic, | |
2400 | "xlog_grant_log_space: sleep 2"); | |
2401 | XFS_STATS_INC(xs_sleep_logspace); | |
2402 | sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); | |
2403 | ||
2404 | if (XLOG_FORCED_SHUTDOWN(log)) { | |
2405 | s = GRANT_LOCK(log); | |
2406 | goto error_return; | |
2407 | } | |
2408 | ||
2409 | xlog_trace_loggrant(log, tic, | |
2410 | "xlog_grant_log_space: wake 2"); | |
2411 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
2412 | s = GRANT_LOCK(log); | |
2413 | goto redo; | |
2414 | } else if (tic->t_flags & XLOG_TIC_IN_Q) | |
2415 | XLOG_DEL_TICKETQ(log->l_reserve_headq, tic); | |
2416 | ||
2417 | /* we've got enough space */ | |
2418 | XLOG_GRANT_ADD_SPACE(log, need_bytes, 'w'); | |
2419 | XLOG_GRANT_ADD_SPACE(log, need_bytes, 'r'); | |
2420 | #ifdef DEBUG | |
2421 | tail_lsn = log->l_tail_lsn; | |
2422 | /* | |
2423 | * Check to make sure the grant write head didn't just over lap the | |
2424 | * tail. If the cycles are the same, we can't be overlapping. | |
2425 | * Otherwise, make sure that the cycles differ by exactly one and | |
2426 | * check the byte count. | |
2427 | */ | |
2428 | if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { | |
2429 | ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); | |
2430 | ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); | |
2431 | } | |
2432 | #endif | |
2433 | xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit"); | |
2434 | xlog_verify_grant_head(log, 1); | |
2435 | GRANT_UNLOCK(log, s); | |
2436 | return 0; | |
2437 | ||
2438 | error_return: | |
2439 | if (tic->t_flags & XLOG_TIC_IN_Q) | |
2440 | XLOG_DEL_TICKETQ(log->l_reserve_headq, tic); | |
2441 | xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret"); | |
2442 | /* | |
2443 | * If we are failing, make sure the ticket doesn't have any | |
2444 | * current reservations. We don't want to add this back when | |
2445 | * the ticket/transaction gets cancelled. | |
2446 | */ | |
2447 | tic->t_curr_res = 0; | |
2448 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
2449 | GRANT_UNLOCK(log, s); | |
2450 | return XFS_ERROR(EIO); | |
2451 | } /* xlog_grant_log_space */ | |
2452 | ||
2453 | ||
2454 | /* | |
2455 | * Replenish the byte reservation required by moving the grant write head. | |
2456 | * | |
2457 | * | |
2458 | */ | |
2459 | STATIC int | |
2460 | xlog_regrant_write_log_space(xlog_t *log, | |
2461 | xlog_ticket_t *tic) | |
2462 | { | |
2463 | SPLDECL(s); | |
2464 | int free_bytes, need_bytes; | |
2465 | xlog_ticket_t *ntic; | |
2466 | #ifdef DEBUG | |
2467 | xfs_lsn_t tail_lsn; | |
2468 | #endif | |
2469 | ||
2470 | tic->t_curr_res = tic->t_unit_res; | |
2471 | ||
2472 | if (tic->t_cnt > 0) | |
2473 | return (0); | |
2474 | ||
2475 | #ifdef DEBUG | |
2476 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
2477 | panic("regrant Recovery problem"); | |
2478 | #endif | |
2479 | ||
2480 | s = GRANT_LOCK(log); | |
2481 | xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter"); | |
2482 | ||
2483 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2484 | goto error_return; | |
2485 | ||
2486 | /* If there are other waiters on the queue then give them a | |
2487 | * chance at logspace before us. Wake up the first waiters, | |
2488 | * if we do not wake up all the waiters then go to sleep waiting | |
2489 | * for more free space, otherwise try to get some space for | |
2490 | * this transaction. | |
2491 | */ | |
2492 | ||
2493 | if ((ntic = log->l_write_headq)) { | |
2494 | free_bytes = xlog_space_left(log, log->l_grant_write_cycle, | |
2495 | log->l_grant_write_bytes); | |
2496 | do { | |
2497 | ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); | |
2498 | ||
2499 | if (free_bytes < ntic->t_unit_res) | |
2500 | break; | |
2501 | free_bytes -= ntic->t_unit_res; | |
2502 | sv_signal(&ntic->t_sema); | |
2503 | ntic = ntic->t_next; | |
2504 | } while (ntic != log->l_write_headq); | |
2505 | ||
2506 | if (ntic != log->l_write_headq) { | |
2507 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
2508 | XLOG_INS_TICKETQ(log->l_write_headq, tic); | |
2509 | ||
2510 | xlog_trace_loggrant(log, tic, | |
2511 | "xlog_regrant_write_log_space: sleep 1"); | |
2512 | XFS_STATS_INC(xs_sleep_logspace); | |
2513 | sv_wait(&tic->t_sema, PINOD|PLTWAIT, | |
2514 | &log->l_grant_lock, s); | |
2515 | ||
2516 | /* If we're shutting down, this tic is already | |
2517 | * off the queue */ | |
2518 | if (XLOG_FORCED_SHUTDOWN(log)) { | |
2519 | s = GRANT_LOCK(log); | |
2520 | goto error_return; | |
2521 | } | |
2522 | ||
2523 | xlog_trace_loggrant(log, tic, | |
2524 | "xlog_regrant_write_log_space: wake 1"); | |
2525 | xlog_grant_push_ail(log->l_mp, tic->t_unit_res); | |
2526 | s = GRANT_LOCK(log); | |
2527 | } | |
2528 | } | |
2529 | ||
2530 | need_bytes = tic->t_unit_res; | |
2531 | ||
2532 | redo: | |
2533 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2534 | goto error_return; | |
2535 | ||
2536 | free_bytes = xlog_space_left(log, log->l_grant_write_cycle, | |
2537 | log->l_grant_write_bytes); | |
2538 | if (free_bytes < need_bytes) { | |
2539 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
2540 | XLOG_INS_TICKETQ(log->l_write_headq, tic); | |
2541 | XFS_STATS_INC(xs_sleep_logspace); | |
2542 | sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s); | |
2543 | ||
2544 | /* If we're shutting down, this tic is already off the queue */ | |
2545 | if (XLOG_FORCED_SHUTDOWN(log)) { | |
2546 | s = GRANT_LOCK(log); | |
2547 | goto error_return; | |
2548 | } | |
2549 | ||
2550 | xlog_trace_loggrant(log, tic, | |
2551 | "xlog_regrant_write_log_space: wake 2"); | |
2552 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
2553 | s = GRANT_LOCK(log); | |
2554 | goto redo; | |
2555 | } else if (tic->t_flags & XLOG_TIC_IN_Q) | |
2556 | XLOG_DEL_TICKETQ(log->l_write_headq, tic); | |
2557 | ||
2558 | XLOG_GRANT_ADD_SPACE(log, need_bytes, 'w'); /* we've got enough space */ | |
2559 | #ifdef DEBUG | |
2560 | tail_lsn = log->l_tail_lsn; | |
2561 | if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { | |
2562 | ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); | |
2563 | ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); | |
2564 | } | |
2565 | #endif | |
2566 | ||
2567 | xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit"); | |
2568 | xlog_verify_grant_head(log, 1); | |
2569 | GRANT_UNLOCK(log, s); | |
2570 | return (0); | |
2571 | ||
2572 | ||
2573 | error_return: | |
2574 | if (tic->t_flags & XLOG_TIC_IN_Q) | |
2575 | XLOG_DEL_TICKETQ(log->l_reserve_headq, tic); | |
2576 | xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret"); | |
2577 | /* | |
2578 | * If we are failing, make sure the ticket doesn't have any | |
2579 | * current reservations. We don't want to add this back when | |
2580 | * the ticket/transaction gets cancelled. | |
2581 | */ | |
2582 | tic->t_curr_res = 0; | |
2583 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
2584 | GRANT_UNLOCK(log, s); | |
2585 | return XFS_ERROR(EIO); | |
2586 | } /* xlog_regrant_write_log_space */ | |
2587 | ||
2588 | ||
2589 | /* The first cnt-1 times through here we don't need to | |
2590 | * move the grant write head because the permanent | |
2591 | * reservation has reserved cnt times the unit amount. | |
2592 | * Release part of current permanent unit reservation and | |
2593 | * reset current reservation to be one units worth. Also | |
2594 | * move grant reservation head forward. | |
2595 | */ | |
2596 | STATIC void | |
2597 | xlog_regrant_reserve_log_space(xlog_t *log, | |
2598 | xlog_ticket_t *ticket) | |
2599 | { | |
2600 | SPLDECL(s); | |
2601 | ||
2602 | xlog_trace_loggrant(log, ticket, | |
2603 | "xlog_regrant_reserve_log_space: enter"); | |
2604 | if (ticket->t_cnt > 0) | |
2605 | ticket->t_cnt--; | |
2606 | ||
2607 | s = GRANT_LOCK(log); | |
2608 | XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'w'); | |
2609 | XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'r'); | |
2610 | ticket->t_curr_res = ticket->t_unit_res; | |
2611 | xlog_trace_loggrant(log, ticket, | |
2612 | "xlog_regrant_reserve_log_space: sub current res"); | |
2613 | xlog_verify_grant_head(log, 1); | |
2614 | ||
2615 | /* just return if we still have some of the pre-reserved space */ | |
2616 | if (ticket->t_cnt > 0) { | |
2617 | GRANT_UNLOCK(log, s); | |
2618 | return; | |
2619 | } | |
2620 | ||
2621 | XLOG_GRANT_ADD_SPACE(log, ticket->t_unit_res, 'r'); | |
2622 | xlog_trace_loggrant(log, ticket, | |
2623 | "xlog_regrant_reserve_log_space: exit"); | |
2624 | xlog_verify_grant_head(log, 0); | |
2625 | GRANT_UNLOCK(log, s); | |
2626 | ticket->t_curr_res = ticket->t_unit_res; | |
2627 | } /* xlog_regrant_reserve_log_space */ | |
2628 | ||
2629 | ||
2630 | /* | |
2631 | * Give back the space left from a reservation. | |
2632 | * | |
2633 | * All the information we need to make a correct determination of space left | |
2634 | * is present. For non-permanent reservations, things are quite easy. The | |
2635 | * count should have been decremented to zero. We only need to deal with the | |
2636 | * space remaining in the current reservation part of the ticket. If the | |
2637 | * ticket contains a permanent reservation, there may be left over space which | |
2638 | * needs to be released. A count of N means that N-1 refills of the current | |
2639 | * reservation can be done before we need to ask for more space. The first | |
2640 | * one goes to fill up the first current reservation. Once we run out of | |
2641 | * space, the count will stay at zero and the only space remaining will be | |
2642 | * in the current reservation field. | |
2643 | */ | |
2644 | STATIC void | |
2645 | xlog_ungrant_log_space(xlog_t *log, | |
2646 | xlog_ticket_t *ticket) | |
2647 | { | |
2648 | SPLDECL(s); | |
2649 | ||
2650 | if (ticket->t_cnt > 0) | |
2651 | ticket->t_cnt--; | |
2652 | ||
2653 | s = GRANT_LOCK(log); | |
2654 | xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter"); | |
2655 | ||
2656 | XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'w'); | |
2657 | XLOG_GRANT_SUB_SPACE(log, ticket->t_curr_res, 'r'); | |
2658 | ||
2659 | xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current"); | |
2660 | ||
2661 | /* If this is a permanent reservation ticket, we may be able to free | |
2662 | * up more space based on the remaining count. | |
2663 | */ | |
2664 | if (ticket->t_cnt > 0) { | |
2665 | ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); | |
2666 | XLOG_GRANT_SUB_SPACE(log, ticket->t_unit_res*ticket->t_cnt,'w'); | |
2667 | XLOG_GRANT_SUB_SPACE(log, ticket->t_unit_res*ticket->t_cnt,'r'); | |
2668 | } | |
2669 | ||
2670 | xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit"); | |
2671 | xlog_verify_grant_head(log, 1); | |
2672 | GRANT_UNLOCK(log, s); | |
2673 | xfs_log_move_tail(log->l_mp, 1); | |
2674 | } /* xlog_ungrant_log_space */ | |
2675 | ||
2676 | ||
2677 | /* | |
2678 | * Atomically put back used ticket. | |
2679 | */ | |
2680 | void | |
2681 | xlog_state_put_ticket(xlog_t *log, | |
2682 | xlog_ticket_t *tic) | |
2683 | { | |
2684 | unsigned long s; | |
2685 | ||
2686 | s = LOG_LOCK(log); | |
2687 | xlog_ticket_put(log, tic); | |
2688 | LOG_UNLOCK(log, s); | |
2689 | } /* xlog_state_put_ticket */ | |
2690 | ||
2691 | /* | |
2692 | * Flush iclog to disk if this is the last reference to the given iclog and | |
2693 | * the WANT_SYNC bit is set. | |
2694 | * | |
2695 | * When this function is entered, the iclog is not necessarily in the | |
2696 | * WANT_SYNC state. It may be sitting around waiting to get filled. | |
2697 | * | |
2698 | * | |
2699 | */ | |
2700 | int | |
2701 | xlog_state_release_iclog(xlog_t *log, | |
2702 | xlog_in_core_t *iclog) | |
2703 | { | |
2704 | SPLDECL(s); | |
2705 | int sync = 0; /* do we sync? */ | |
2706 | ||
2707 | xlog_assign_tail_lsn(log->l_mp); | |
2708 | ||
2709 | s = LOG_LOCK(log); | |
2710 | ||
2711 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
2712 | LOG_UNLOCK(log, s); | |
2713 | return XFS_ERROR(EIO); | |
2714 | } | |
2715 | ||
2716 | ASSERT(iclog->ic_refcnt > 0); | |
2717 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || | |
2718 | iclog->ic_state == XLOG_STATE_WANT_SYNC); | |
2719 | ||
2720 | if (--iclog->ic_refcnt == 0 && | |
2721 | iclog->ic_state == XLOG_STATE_WANT_SYNC) { | |
2722 | sync++; | |
2723 | iclog->ic_state = XLOG_STATE_SYNCING; | |
2724 | INT_SET(iclog->ic_header.h_tail_lsn, ARCH_CONVERT, log->l_tail_lsn); | |
2725 | xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); | |
2726 | /* cycle incremented when incrementing curr_block */ | |
2727 | } | |
2728 | ||
2729 | LOG_UNLOCK(log, s); | |
2730 | ||
2731 | /* | |
2732 | * We let the log lock go, so it's possible that we hit a log I/O | |
2733 | * error or someother SHUTDOWN condition that marks the iclog | |
2734 | * as XLOG_STATE_IOERROR before the bwrite. However, we know that | |
2735 | * this iclog has consistent data, so we ignore IOERROR | |
2736 | * flags after this point. | |
2737 | */ | |
2738 | if (sync) { | |
2739 | return xlog_sync(log, iclog); | |
2740 | } | |
2741 | return (0); | |
2742 | ||
2743 | } /* xlog_state_release_iclog */ | |
2744 | ||
2745 | ||
2746 | /* | |
2747 | * This routine will mark the current iclog in the ring as WANT_SYNC | |
2748 | * and move the current iclog pointer to the next iclog in the ring. | |
2749 | * When this routine is called from xlog_state_get_iclog_space(), the | |
2750 | * exact size of the iclog has not yet been determined. All we know is | |
2751 | * that every data block. We have run out of space in this log record. | |
2752 | */ | |
2753 | STATIC void | |
2754 | xlog_state_switch_iclogs(xlog_t *log, | |
2755 | xlog_in_core_t *iclog, | |
2756 | int eventual_size) | |
2757 | { | |
2758 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
2759 | if (!eventual_size) | |
2760 | eventual_size = iclog->ic_offset; | |
2761 | iclog->ic_state = XLOG_STATE_WANT_SYNC; | |
2762 | INT_SET(iclog->ic_header.h_prev_block, ARCH_CONVERT, log->l_prev_block); | |
2763 | log->l_prev_block = log->l_curr_block; | |
2764 | log->l_prev_cycle = log->l_curr_cycle; | |
2765 | ||
2766 | /* roll log?: ic_offset changed later */ | |
2767 | log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); | |
2768 | ||
2769 | /* Round up to next log-sunit */ | |
2770 | if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && | |
2771 | log->l_mp->m_sb.sb_logsunit > 1) { | |
2772 | __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); | |
2773 | log->l_curr_block = roundup(log->l_curr_block, sunit_bb); | |
2774 | } | |
2775 | ||
2776 | if (log->l_curr_block >= log->l_logBBsize) { | |
2777 | log->l_curr_cycle++; | |
2778 | if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) | |
2779 | log->l_curr_cycle++; | |
2780 | log->l_curr_block -= log->l_logBBsize; | |
2781 | ASSERT(log->l_curr_block >= 0); | |
2782 | } | |
2783 | ASSERT(iclog == log->l_iclog); | |
2784 | log->l_iclog = iclog->ic_next; | |
2785 | } /* xlog_state_switch_iclogs */ | |
2786 | ||
2787 | ||
2788 | /* | |
2789 | * Write out all data in the in-core log as of this exact moment in time. | |
2790 | * | |
2791 | * Data may be written to the in-core log during this call. However, | |
2792 | * we don't guarantee this data will be written out. A change from past | |
2793 | * implementation means this routine will *not* write out zero length LRs. | |
2794 | * | |
2795 | * Basically, we try and perform an intelligent scan of the in-core logs. | |
2796 | * If we determine there is no flushable data, we just return. There is no | |
2797 | * flushable data if: | |
2798 | * | |
2799 | * 1. the current iclog is active and has no data; the previous iclog | |
2800 | * is in the active or dirty state. | |
2801 | * 2. the current iclog is drity, and the previous iclog is in the | |
2802 | * active or dirty state. | |
2803 | * | |
2804 | * We may sleep (call psema) if: | |
2805 | * | |
2806 | * 1. the current iclog is not in the active nor dirty state. | |
2807 | * 2. the current iclog dirty, and the previous iclog is not in the | |
2808 | * active nor dirty state. | |
2809 | * 3. the current iclog is active, and there is another thread writing | |
2810 | * to this particular iclog. | |
2811 | * 4. a) the current iclog is active and has no other writers | |
2812 | * b) when we return from flushing out this iclog, it is still | |
2813 | * not in the active nor dirty state. | |
2814 | */ | |
2815 | STATIC int | |
2816 | xlog_state_sync_all(xlog_t *log, uint flags) | |
2817 | { | |
2818 | xlog_in_core_t *iclog; | |
2819 | xfs_lsn_t lsn; | |
2820 | SPLDECL(s); | |
2821 | ||
2822 | s = LOG_LOCK(log); | |
2823 | ||
2824 | iclog = log->l_iclog; | |
2825 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
2826 | LOG_UNLOCK(log, s); | |
2827 | return XFS_ERROR(EIO); | |
2828 | } | |
2829 | ||
2830 | /* If the head iclog is not active nor dirty, we just attach | |
2831 | * ourselves to the head and go to sleep. | |
2832 | */ | |
2833 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2834 | iclog->ic_state == XLOG_STATE_DIRTY) { | |
2835 | /* | |
2836 | * If the head is dirty or (active and empty), then | |
2837 | * we need to look at the previous iclog. If the previous | |
2838 | * iclog is active or dirty we are done. There is nothing | |
2839 | * to sync out. Otherwise, we attach ourselves to the | |
2840 | * previous iclog and go to sleep. | |
2841 | */ | |
2842 | if (iclog->ic_state == XLOG_STATE_DIRTY || | |
2843 | (iclog->ic_refcnt == 0 && iclog->ic_offset == 0)) { | |
2844 | iclog = iclog->ic_prev; | |
2845 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2846 | iclog->ic_state == XLOG_STATE_DIRTY) | |
2847 | goto no_sleep; | |
2848 | else | |
2849 | goto maybe_sleep; | |
2850 | } else { | |
2851 | if (iclog->ic_refcnt == 0) { | |
2852 | /* We are the only one with access to this | |
2853 | * iclog. Flush it out now. There should | |
2854 | * be a roundoff of zero to show that someone | |
2855 | * has already taken care of the roundoff from | |
2856 | * the previous sync. | |
2857 | */ | |
2858 | iclog->ic_refcnt++; | |
2859 | lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT); | |
2860 | xlog_state_switch_iclogs(log, iclog, 0); | |
2861 | LOG_UNLOCK(log, s); | |
2862 | ||
2863 | if (xlog_state_release_iclog(log, iclog)) | |
2864 | return XFS_ERROR(EIO); | |
2865 | s = LOG_LOCK(log); | |
2866 | if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) == lsn && | |
2867 | iclog->ic_state != XLOG_STATE_DIRTY) | |
2868 | goto maybe_sleep; | |
2869 | else | |
2870 | goto no_sleep; | |
2871 | } else { | |
2872 | /* Someone else is writing to this iclog. | |
2873 | * Use its call to flush out the data. However, | |
2874 | * the other thread may not force out this LR, | |
2875 | * so we mark it WANT_SYNC. | |
2876 | */ | |
2877 | xlog_state_switch_iclogs(log, iclog, 0); | |
2878 | goto maybe_sleep; | |
2879 | } | |
2880 | } | |
2881 | } | |
2882 | ||
2883 | /* By the time we come around again, the iclog could've been filled | |
2884 | * which would give it another lsn. If we have a new lsn, just | |
2885 | * return because the relevant data has been flushed. | |
2886 | */ | |
2887 | maybe_sleep: | |
2888 | if (flags & XFS_LOG_SYNC) { | |
2889 | /* | |
2890 | * We must check if we're shutting down here, before | |
2891 | * we wait, while we're holding the LOG_LOCK. | |
2892 | * Then we check again after waking up, in case our | |
2893 | * sleep was disturbed by a bad news. | |
2894 | */ | |
2895 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
2896 | LOG_UNLOCK(log, s); | |
2897 | return XFS_ERROR(EIO); | |
2898 | } | |
2899 | XFS_STATS_INC(xs_log_force_sleep); | |
2900 | sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s); | |
2901 | /* | |
2902 | * No need to grab the log lock here since we're | |
2903 | * only deciding whether or not to return EIO | |
2904 | * and the memory read should be atomic. | |
2905 | */ | |
2906 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
2907 | return XFS_ERROR(EIO); | |
2908 | ||
2909 | } else { | |
2910 | ||
2911 | no_sleep: | |
2912 | LOG_UNLOCK(log, s); | |
2913 | } | |
2914 | return 0; | |
2915 | } /* xlog_state_sync_all */ | |
2916 | ||
2917 | ||
2918 | /* | |
2919 | * Used by code which implements synchronous log forces. | |
2920 | * | |
2921 | * Find in-core log with lsn. | |
2922 | * If it is in the DIRTY state, just return. | |
2923 | * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC | |
2924 | * state and go to sleep or return. | |
2925 | * If it is in any other state, go to sleep or return. | |
2926 | * | |
2927 | * If filesystem activity goes to zero, the iclog will get flushed only by | |
2928 | * bdflush(). | |
2929 | */ | |
2930 | int | |
2931 | xlog_state_sync(xlog_t *log, | |
2932 | xfs_lsn_t lsn, | |
2933 | uint flags) | |
2934 | { | |
2935 | xlog_in_core_t *iclog; | |
2936 | int already_slept = 0; | |
2937 | SPLDECL(s); | |
2938 | ||
2939 | ||
2940 | try_again: | |
2941 | s = LOG_LOCK(log); | |
2942 | iclog = log->l_iclog; | |
2943 | ||
2944 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
2945 | LOG_UNLOCK(log, s); | |
2946 | return XFS_ERROR(EIO); | |
2947 | } | |
2948 | ||
2949 | do { | |
2950 | if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) != lsn) { | |
2951 | iclog = iclog->ic_next; | |
2952 | continue; | |
2953 | } | |
2954 | ||
2955 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
2956 | LOG_UNLOCK(log, s); | |
2957 | return 0; | |
2958 | } | |
2959 | ||
2960 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
2961 | /* | |
2962 | * We sleep here if we haven't already slept (e.g. | |
2963 | * this is the first time we've looked at the correct | |
2964 | * iclog buf) and the buffer before us is going to | |
2965 | * be sync'ed. The reason for this is that if we | |
2966 | * are doing sync transactions here, by waiting for | |
2967 | * the previous I/O to complete, we can allow a few | |
2968 | * more transactions into this iclog before we close | |
2969 | * it down. | |
2970 | * | |
2971 | * Otherwise, we mark the buffer WANT_SYNC, and bump | |
2972 | * up the refcnt so we can release the log (which drops | |
2973 | * the ref count). The state switch keeps new transaction | |
2974 | * commits from using this buffer. When the current commits | |
2975 | * finish writing into the buffer, the refcount will drop to | |
2976 | * zero and the buffer will go out then. | |
2977 | */ | |
2978 | if (!already_slept && | |
2979 | (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC | | |
2980 | XLOG_STATE_SYNCING))) { | |
2981 | ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); | |
2982 | XFS_STATS_INC(xs_log_force_sleep); | |
2983 | sv_wait(&iclog->ic_prev->ic_writesema, PSWP, | |
2984 | &log->l_icloglock, s); | |
2985 | already_slept = 1; | |
2986 | goto try_again; | |
2987 | } else { | |
2988 | iclog->ic_refcnt++; | |
2989 | xlog_state_switch_iclogs(log, iclog, 0); | |
2990 | LOG_UNLOCK(log, s); | |
2991 | if (xlog_state_release_iclog(log, iclog)) | |
2992 | return XFS_ERROR(EIO); | |
2993 | s = LOG_LOCK(log); | |
2994 | } | |
2995 | } | |
2996 | ||
2997 | if ((flags & XFS_LOG_SYNC) && /* sleep */ | |
2998 | !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { | |
2999 | ||
3000 | /* | |
3001 | * Don't wait on the forcesema if we know that we've | |
3002 | * gotten a log write error. | |
3003 | */ | |
3004 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
3005 | LOG_UNLOCK(log, s); | |
3006 | return XFS_ERROR(EIO); | |
3007 | } | |
3008 | XFS_STATS_INC(xs_log_force_sleep); | |
3009 | sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s); | |
3010 | /* | |
3011 | * No need to grab the log lock here since we're | |
3012 | * only deciding whether or not to return EIO | |
3013 | * and the memory read should be atomic. | |
3014 | */ | |
3015 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3016 | return XFS_ERROR(EIO); | |
3017 | } else { /* just return */ | |
3018 | LOG_UNLOCK(log, s); | |
3019 | } | |
3020 | return 0; | |
3021 | ||
3022 | } while (iclog != log->l_iclog); | |
3023 | ||
3024 | LOG_UNLOCK(log, s); | |
3025 | return (0); | |
3026 | } /* xlog_state_sync */ | |
3027 | ||
3028 | ||
3029 | /* | |
3030 | * Called when we want to mark the current iclog as being ready to sync to | |
3031 | * disk. | |
3032 | */ | |
3033 | void | |
3034 | xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) | |
3035 | { | |
3036 | SPLDECL(s); | |
3037 | ||
3038 | s = LOG_LOCK(log); | |
3039 | ||
3040 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3041 | xlog_state_switch_iclogs(log, iclog, 0); | |
3042 | } else { | |
3043 | ASSERT(iclog->ic_state & | |
3044 | (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); | |
3045 | } | |
3046 | ||
3047 | LOG_UNLOCK(log, s); | |
3048 | } /* xlog_state_want_sync */ | |
3049 | ||
3050 | ||
3051 | ||
3052 | /***************************************************************************** | |
3053 | * | |
3054 | * TICKET functions | |
3055 | * | |
3056 | ***************************************************************************** | |
3057 | */ | |
3058 | ||
3059 | /* | |
3060 | * Algorithm doesn't take into account page size. ;-( | |
3061 | */ | |
3062 | STATIC void | |
3063 | xlog_state_ticket_alloc(xlog_t *log) | |
3064 | { | |
3065 | xlog_ticket_t *t_list; | |
3066 | xlog_ticket_t *next; | |
3067 | xfs_caddr_t buf; | |
3068 | uint i = (NBPP / sizeof(xlog_ticket_t)) - 2; | |
3069 | SPLDECL(s); | |
3070 | ||
3071 | /* | |
3072 | * The kmem_zalloc may sleep, so we shouldn't be holding the | |
3073 | * global lock. XXXmiken: may want to use zone allocator. | |
3074 | */ | |
3075 | buf = (xfs_caddr_t) kmem_zalloc(NBPP, KM_SLEEP); | |
3076 | ||
3077 | s = LOG_LOCK(log); | |
3078 | ||
3079 | /* Attach 1st ticket to Q, so we can keep track of allocated memory */ | |
3080 | t_list = (xlog_ticket_t *)buf; | |
3081 | t_list->t_next = log->l_unmount_free; | |
3082 | log->l_unmount_free = t_list++; | |
3083 | log->l_ticket_cnt++; | |
3084 | log->l_ticket_tcnt++; | |
3085 | ||
3086 | /* Next ticket becomes first ticket attached to ticket free list */ | |
3087 | if (log->l_freelist != NULL) { | |
3088 | ASSERT(log->l_tail != NULL); | |
3089 | log->l_tail->t_next = t_list; | |
3090 | } else { | |
3091 | log->l_freelist = t_list; | |
3092 | } | |
3093 | log->l_ticket_cnt++; | |
3094 | log->l_ticket_tcnt++; | |
3095 | ||
3096 | /* Cycle through rest of alloc'ed memory, building up free Q */ | |
3097 | for ( ; i > 0; i--) { | |
3098 | next = t_list + 1; | |
3099 | t_list->t_next = next; | |
3100 | t_list = next; | |
3101 | log->l_ticket_cnt++; | |
3102 | log->l_ticket_tcnt++; | |
3103 | } | |
3104 | t_list->t_next = NULL; | |
3105 | log->l_tail = t_list; | |
3106 | LOG_UNLOCK(log, s); | |
3107 | } /* xlog_state_ticket_alloc */ | |
3108 | ||
3109 | ||
3110 | /* | |
3111 | * Put ticket into free list | |
3112 | * | |
3113 | * Assumption: log lock is held around this call. | |
3114 | */ | |
3115 | STATIC void | |
3116 | xlog_ticket_put(xlog_t *log, | |
3117 | xlog_ticket_t *ticket) | |
3118 | { | |
3119 | sv_destroy(&ticket->t_sema); | |
3120 | ||
3121 | /* | |
3122 | * Don't think caching will make that much difference. It's | |
3123 | * more important to make debug easier. | |
3124 | */ | |
3125 | #if 0 | |
3126 | /* real code will want to use LIFO for caching */ | |
3127 | ticket->t_next = log->l_freelist; | |
3128 | log->l_freelist = ticket; | |
3129 | /* no need to clear fields */ | |
3130 | #else | |
3131 | /* When we debug, it is easier if tickets are cycled */ | |
3132 | ticket->t_next = NULL; | |
3133 | if (log->l_tail != 0) { | |
3134 | log->l_tail->t_next = ticket; | |
3135 | } else { | |
3136 | ASSERT(log->l_freelist == 0); | |
3137 | log->l_freelist = ticket; | |
3138 | } | |
3139 | log->l_tail = ticket; | |
3140 | #endif /* DEBUG */ | |
3141 | log->l_ticket_cnt++; | |
3142 | } /* xlog_ticket_put */ | |
3143 | ||
3144 | ||
3145 | /* | |
3146 | * Grab ticket off freelist or allocation some more | |
3147 | */ | |
3148 | xlog_ticket_t * | |
3149 | xlog_ticket_get(xlog_t *log, | |
3150 | int unit_bytes, | |
3151 | int cnt, | |
3152 | char client, | |
3153 | uint xflags) | |
3154 | { | |
3155 | xlog_ticket_t *tic; | |
3156 | uint num_headers; | |
3157 | SPLDECL(s); | |
3158 | ||
3159 | alloc: | |
3160 | if (log->l_freelist == NULL) | |
3161 | xlog_state_ticket_alloc(log); /* potentially sleep */ | |
3162 | ||
3163 | s = LOG_LOCK(log); | |
3164 | if (log->l_freelist == NULL) { | |
3165 | LOG_UNLOCK(log, s); | |
3166 | goto alloc; | |
3167 | } | |
3168 | tic = log->l_freelist; | |
3169 | log->l_freelist = tic->t_next; | |
3170 | if (log->l_freelist == NULL) | |
3171 | log->l_tail = NULL; | |
3172 | log->l_ticket_cnt--; | |
3173 | LOG_UNLOCK(log, s); | |
3174 | ||
3175 | /* | |
3176 | * Permanent reservations have up to 'cnt'-1 active log operations | |
3177 | * in the log. A unit in this case is the amount of space for one | |
3178 | * of these log operations. Normal reservations have a cnt of 1 | |
3179 | * and their unit amount is the total amount of space required. | |
3180 | * | |
3181 | * The following lines of code account for non-transaction data | |
32fb9b57 TS |
3182 | * which occupy space in the on-disk log. |
3183 | * | |
3184 | * Normal form of a transaction is: | |
3185 | * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> | |
3186 | * and then there are LR hdrs, split-recs and roundoff at end of syncs. | |
3187 | * | |
3188 | * We need to account for all the leadup data and trailer data | |
3189 | * around the transaction data. | |
3190 | * And then we need to account for the worst case in terms of using | |
3191 | * more space. | |
3192 | * The worst case will happen if: | |
3193 | * - the placement of the transaction happens to be such that the | |
3194 | * roundoff is at its maximum | |
3195 | * - the transaction data is synced before the commit record is synced | |
3196 | * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> | |
3197 | * Therefore the commit record is in its own Log Record. | |
3198 | * This can happen as the commit record is called with its | |
3199 | * own region to xlog_write(). | |
3200 | * This then means that in the worst case, roundoff can happen for | |
3201 | * the commit-rec as well. | |
3202 | * The commit-rec is smaller than padding in this scenario and so it is | |
3203 | * not added separately. | |
1da177e4 LT |
3204 | */ |
3205 | ||
32fb9b57 TS |
3206 | /* for trans header */ |
3207 | unit_bytes += sizeof(xlog_op_header_t); | |
3208 | unit_bytes += sizeof(xfs_trans_header_t); | |
3209 | ||
1da177e4 | 3210 | /* for start-rec */ |
32fb9b57 TS |
3211 | unit_bytes += sizeof(xlog_op_header_t); |
3212 | ||
3213 | /* for LR headers */ | |
3214 | num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); | |
3215 | unit_bytes += log->l_iclog_hsize * num_headers; | |
1da177e4 | 3216 | |
32fb9b57 TS |
3217 | /* for commit-rec LR header - note: padding will subsume the ophdr */ |
3218 | unit_bytes += log->l_iclog_hsize; | |
3219 | ||
3220 | /* for split-recs - ophdrs added when data split over LRs */ | |
3221 | unit_bytes += sizeof(xlog_op_header_t) * num_headers; | |
3222 | ||
3223 | /* for roundoff padding for transaction data and one for commit record */ | |
1da177e4 | 3224 | if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) && |
32fb9b57 | 3225 | log->l_mp->m_sb.sb_logsunit > 1) { |
1da177e4 | 3226 | /* log su roundoff */ |
32fb9b57 | 3227 | unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; |
1da177e4 LT |
3228 | } else { |
3229 | /* BB roundoff */ | |
32fb9b57 | 3230 | unit_bytes += 2*BBSIZE; |
1da177e4 LT |
3231 | } |
3232 | ||
1da177e4 LT |
3233 | tic->t_unit_res = unit_bytes; |
3234 | tic->t_curr_res = unit_bytes; | |
3235 | tic->t_cnt = cnt; | |
3236 | tic->t_ocnt = cnt; | |
3237 | tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); | |
3238 | tic->t_clientid = client; | |
3239 | tic->t_flags = XLOG_TIC_INITED; | |
3240 | if (xflags & XFS_LOG_PERM_RESERV) | |
3241 | tic->t_flags |= XLOG_TIC_PERM_RESERV; | |
3242 | sv_init(&(tic->t_sema), SV_DEFAULT, "logtick"); | |
3243 | ||
3244 | return tic; | |
3245 | } /* xlog_ticket_get */ | |
3246 | ||
3247 | ||
3248 | /****************************************************************************** | |
3249 | * | |
3250 | * Log debug routines | |
3251 | * | |
3252 | ****************************************************************************** | |
3253 | */ | |
3254 | #if defined(DEBUG) && !defined(XLOG_NOLOG) | |
3255 | /* | |
3256 | * Make sure that the destination ptr is within the valid data region of | |
3257 | * one of the iclogs. This uses backup pointers stored in a different | |
3258 | * part of the log in case we trash the log structure. | |
3259 | */ | |
3260 | void | |
3261 | xlog_verify_dest_ptr(xlog_t *log, | |
3262 | __psint_t ptr) | |
3263 | { | |
3264 | int i; | |
3265 | int good_ptr = 0; | |
3266 | ||
3267 | for (i=0; i < log->l_iclog_bufs; i++) { | |
3268 | if (ptr >= (__psint_t)log->l_iclog_bak[i] && | |
3269 | ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) | |
3270 | good_ptr++; | |
3271 | } | |
3272 | if (! good_ptr) | |
3273 | xlog_panic("xlog_verify_dest_ptr: invalid ptr"); | |
3274 | } /* xlog_verify_dest_ptr */ | |
3275 | ||
3276 | STATIC void | |
3277 | xlog_verify_grant_head(xlog_t *log, int equals) | |
3278 | { | |
3279 | if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { | |
3280 | if (equals) | |
3281 | ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); | |
3282 | else | |
3283 | ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); | |
3284 | } else { | |
3285 | ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); | |
3286 | ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); | |
3287 | } | |
3288 | } /* xlog_verify_grant_head */ | |
3289 | ||
3290 | /* check if it will fit */ | |
3291 | STATIC void | |
3292 | xlog_verify_tail_lsn(xlog_t *log, | |
3293 | xlog_in_core_t *iclog, | |
3294 | xfs_lsn_t tail_lsn) | |
3295 | { | |
3296 | int blocks; | |
3297 | ||
3298 | if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { | |
3299 | blocks = | |
3300 | log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); | |
3301 | if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) | |
3302 | xlog_panic("xlog_verify_tail_lsn: ran out of log space"); | |
3303 | } else { | |
3304 | ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); | |
3305 | ||
3306 | if (BLOCK_LSN(tail_lsn) == log->l_prev_block) | |
3307 | xlog_panic("xlog_verify_tail_lsn: tail wrapped"); | |
3308 | ||
3309 | blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; | |
3310 | if (blocks < BTOBB(iclog->ic_offset) + 1) | |
3311 | xlog_panic("xlog_verify_tail_lsn: ran out of log space"); | |
3312 | } | |
3313 | } /* xlog_verify_tail_lsn */ | |
3314 | ||
3315 | /* | |
3316 | * Perform a number of checks on the iclog before writing to disk. | |
3317 | * | |
3318 | * 1. Make sure the iclogs are still circular | |
3319 | * 2. Make sure we have a good magic number | |
3320 | * 3. Make sure we don't have magic numbers in the data | |
3321 | * 4. Check fields of each log operation header for: | |
3322 | * A. Valid client identifier | |
3323 | * B. tid ptr value falls in valid ptr space (user space code) | |
3324 | * C. Length in log record header is correct according to the | |
3325 | * individual operation headers within record. | |
3326 | * 5. When a bwrite will occur within 5 blocks of the front of the physical | |
3327 | * log, check the preceding blocks of the physical log to make sure all | |
3328 | * the cycle numbers agree with the current cycle number. | |
3329 | */ | |
3330 | STATIC void | |
3331 | xlog_verify_iclog(xlog_t *log, | |
3332 | xlog_in_core_t *iclog, | |
3333 | int count, | |
3334 | boolean_t syncing) | |
3335 | { | |
3336 | xlog_op_header_t *ophead; | |
3337 | xlog_in_core_t *icptr; | |
3338 | xlog_in_core_2_t *xhdr; | |
3339 | xfs_caddr_t ptr; | |
3340 | xfs_caddr_t base_ptr; | |
3341 | __psint_t field_offset; | |
3342 | __uint8_t clientid; | |
3343 | int len, i, j, k, op_len; | |
3344 | int idx; | |
3345 | SPLDECL(s); | |
3346 | ||
3347 | /* check validity of iclog pointers */ | |
3348 | s = LOG_LOCK(log); | |
3349 | icptr = log->l_iclog; | |
3350 | for (i=0; i < log->l_iclog_bufs; i++) { | |
3351 | if (icptr == 0) | |
3352 | xlog_panic("xlog_verify_iclog: invalid ptr"); | |
3353 | icptr = icptr->ic_next; | |
3354 | } | |
3355 | if (icptr != log->l_iclog) | |
3356 | xlog_panic("xlog_verify_iclog: corrupt iclog ring"); | |
3357 | LOG_UNLOCK(log, s); | |
3358 | ||
3359 | /* check log magic numbers */ | |
3360 | ptr = (xfs_caddr_t) &(iclog->ic_header); | |
3361 | if (INT_GET(*(uint *)ptr, ARCH_CONVERT) != XLOG_HEADER_MAGIC_NUM) | |
3362 | xlog_panic("xlog_verify_iclog: invalid magic num"); | |
3363 | ||
3364 | for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&(iclog->ic_header))+count; | |
3365 | ptr += BBSIZE) { | |
3366 | if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM) | |
3367 | xlog_panic("xlog_verify_iclog: unexpected magic num"); | |
3368 | } | |
3369 | ||
3370 | /* check fields */ | |
3371 | len = INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT); | |
3372 | ptr = iclog->ic_datap; | |
3373 | base_ptr = ptr; | |
3374 | ophead = (xlog_op_header_t *)ptr; | |
3375 | xhdr = (xlog_in_core_2_t *)&iclog->ic_header; | |
3376 | for (i = 0; i < len; i++) { | |
3377 | ophead = (xlog_op_header_t *)ptr; | |
3378 | ||
3379 | /* clientid is only 1 byte */ | |
3380 | field_offset = (__psint_t) | |
3381 | ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); | |
3382 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
3383 | clientid = ophead->oh_clientid; | |
3384 | } else { | |
3385 | idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); | |
3386 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3387 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3388 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3389 | clientid = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); | |
3390 | } else { | |
3391 | clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); | |
3392 | } | |
3393 | } | |
3394 | if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) | |
3395 | cmn_err(CE_WARN, "xlog_verify_iclog: invalid clientid %d op 0x%p offset 0x%x", clientid, ophead, field_offset); | |
3396 | ||
3397 | /* check length */ | |
3398 | field_offset = (__psint_t) | |
3399 | ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); | |
3400 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
3401 | op_len = INT_GET(ophead->oh_len, ARCH_CONVERT); | |
3402 | } else { | |
3403 | idx = BTOBBT((__psint_t)&ophead->oh_len - | |
3404 | (__psint_t)iclog->ic_datap); | |
3405 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3406 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3407 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3408 | op_len = INT_GET(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT); | |
3409 | } else { | |
3410 | op_len = INT_GET(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT); | |
3411 | } | |
3412 | } | |
3413 | ptr += sizeof(xlog_op_header_t) + op_len; | |
3414 | } | |
3415 | } /* xlog_verify_iclog */ | |
3416 | #endif /* DEBUG && !XLOG_NOLOG */ | |
3417 | ||
3418 | /* | |
3419 | * Mark all iclogs IOERROR. LOG_LOCK is held by the caller. | |
3420 | */ | |
3421 | STATIC int | |
3422 | xlog_state_ioerror( | |
3423 | xlog_t *log) | |
3424 | { | |
3425 | xlog_in_core_t *iclog, *ic; | |
3426 | ||
3427 | iclog = log->l_iclog; | |
3428 | if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3429 | /* | |
3430 | * Mark all the incore logs IOERROR. | |
3431 | * From now on, no log flushes will result. | |
3432 | */ | |
3433 | ic = iclog; | |
3434 | do { | |
3435 | ic->ic_state = XLOG_STATE_IOERROR; | |
3436 | ic = ic->ic_next; | |
3437 | } while (ic != iclog); | |
3438 | return (0); | |
3439 | } | |
3440 | /* | |
3441 | * Return non-zero, if state transition has already happened. | |
3442 | */ | |
3443 | return (1); | |
3444 | } | |
3445 | ||
3446 | /* | |
3447 | * This is called from xfs_force_shutdown, when we're forcibly | |
3448 | * shutting down the filesystem, typically because of an IO error. | |
3449 | * Our main objectives here are to make sure that: | |
3450 | * a. the filesystem gets marked 'SHUTDOWN' for all interested | |
3451 | * parties to find out, 'atomically'. | |
3452 | * b. those who're sleeping on log reservations, pinned objects and | |
3453 | * other resources get woken up, and be told the bad news. | |
3454 | * c. nothing new gets queued up after (a) and (b) are done. | |
3455 | * d. if !logerror, flush the iclogs to disk, then seal them off | |
3456 | * for business. | |
3457 | */ | |
3458 | int | |
3459 | xfs_log_force_umount( | |
3460 | struct xfs_mount *mp, | |
3461 | int logerror) | |
3462 | { | |
3463 | xlog_ticket_t *tic; | |
3464 | xlog_t *log; | |
3465 | int retval; | |
3466 | SPLDECL(s); | |
3467 | SPLDECL(s2); | |
3468 | ||
3469 | log = mp->m_log; | |
3470 | ||
3471 | /* | |
3472 | * If this happens during log recovery, don't worry about | |
3473 | * locking; the log isn't open for business yet. | |
3474 | */ | |
3475 | if (!log || | |
3476 | log->l_flags & XLOG_ACTIVE_RECOVERY) { | |
3477 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
3478 | XFS_BUF_DONE(mp->m_sb_bp); | |
3479 | return (0); | |
3480 | } | |
3481 | ||
3482 | /* | |
3483 | * Somebody could've already done the hard work for us. | |
3484 | * No need to get locks for this. | |
3485 | */ | |
3486 | if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { | |
3487 | ASSERT(XLOG_FORCED_SHUTDOWN(log)); | |
3488 | return (1); | |
3489 | } | |
3490 | retval = 0; | |
3491 | /* | |
3492 | * We must hold both the GRANT lock and the LOG lock, | |
3493 | * before we mark the filesystem SHUTDOWN and wake | |
3494 | * everybody up to tell the bad news. | |
3495 | */ | |
3496 | s = GRANT_LOCK(log); | |
3497 | s2 = LOG_LOCK(log); | |
3498 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
3499 | XFS_BUF_DONE(mp->m_sb_bp); | |
3500 | /* | |
3501 | * This flag is sort of redundant because of the mount flag, but | |
3502 | * it's good to maintain the separation between the log and the rest | |
3503 | * of XFS. | |
3504 | */ | |
3505 | log->l_flags |= XLOG_IO_ERROR; | |
3506 | ||
3507 | /* | |
3508 | * If we hit a log error, we want to mark all the iclogs IOERROR | |
3509 | * while we're still holding the loglock. | |
3510 | */ | |
3511 | if (logerror) | |
3512 | retval = xlog_state_ioerror(log); | |
3513 | LOG_UNLOCK(log, s2); | |
3514 | ||
3515 | /* | |
3516 | * We don't want anybody waiting for log reservations | |
3517 | * after this. That means we have to wake up everybody | |
3518 | * queued up on reserve_headq as well as write_headq. | |
3519 | * In addition, we make sure in xlog_{re}grant_log_space | |
3520 | * that we don't enqueue anything once the SHUTDOWN flag | |
3521 | * is set, and this action is protected by the GRANTLOCK. | |
3522 | */ | |
3523 | if ((tic = log->l_reserve_headq)) { | |
3524 | do { | |
3525 | sv_signal(&tic->t_sema); | |
3526 | tic = tic->t_next; | |
3527 | } while (tic != log->l_reserve_headq); | |
3528 | } | |
3529 | ||
3530 | if ((tic = log->l_write_headq)) { | |
3531 | do { | |
3532 | sv_signal(&tic->t_sema); | |
3533 | tic = tic->t_next; | |
3534 | } while (tic != log->l_write_headq); | |
3535 | } | |
3536 | GRANT_UNLOCK(log, s); | |
3537 | ||
3538 | if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3539 | ASSERT(!logerror); | |
3540 | /* | |
3541 | * Force the incore logs to disk before shutting the | |
3542 | * log down completely. | |
3543 | */ | |
3544 | xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC); | |
3545 | s2 = LOG_LOCK(log); | |
3546 | retval = xlog_state_ioerror(log); | |
3547 | LOG_UNLOCK(log, s2); | |
3548 | } | |
3549 | /* | |
3550 | * Wake up everybody waiting on xfs_log_force. | |
3551 | * Callback all log item committed functions as if the | |
3552 | * log writes were completed. | |
3553 | */ | |
3554 | xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); | |
3555 | ||
3556 | #ifdef XFSERRORDEBUG | |
3557 | { | |
3558 | xlog_in_core_t *iclog; | |
3559 | ||
3560 | s = LOG_LOCK(log); | |
3561 | iclog = log->l_iclog; | |
3562 | do { | |
3563 | ASSERT(iclog->ic_callback == 0); | |
3564 | iclog = iclog->ic_next; | |
3565 | } while (iclog != log->l_iclog); | |
3566 | LOG_UNLOCK(log, s); | |
3567 | } | |
3568 | #endif | |
3569 | /* return non-zero if log IOERROR transition had already happened */ | |
3570 | return (retval); | |
3571 | } | |
3572 | ||
ba0f32d4 | 3573 | STATIC int |
1da177e4 LT |
3574 | xlog_iclogs_empty(xlog_t *log) |
3575 | { | |
3576 | xlog_in_core_t *iclog; | |
3577 | ||
3578 | iclog = log->l_iclog; | |
3579 | do { | |
3580 | /* endianness does not matter here, zero is zero in | |
3581 | * any language. | |
3582 | */ | |
3583 | if (iclog->ic_header.h_num_logops) | |
3584 | return(0); | |
3585 | iclog = iclog->ic_next; | |
3586 | } while (iclog != log->l_iclog); | |
3587 | return(1); | |
3588 | } |