Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 | 24 | #include "xfs_trans.h" |
a844f451 NS |
25 | #include "xfs_sb.h" |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_mount.h" |
28 | #include "xfs_error.h" | |
29 | #include "xfs_log_priv.h" | |
30 | #include "xfs_buf_item.h" | |
a844f451 | 31 | #include "xfs_bmap_btree.h" |
1da177e4 | 32 | #include "xfs_alloc_btree.h" |
a844f451 | 33 | #include "xfs_ialloc_btree.h" |
1da177e4 | 34 | #include "xfs_log_recover.h" |
1da177e4 | 35 | #include "xfs_trans_priv.h" |
a844f451 NS |
36 | #include "xfs_dinode.h" |
37 | #include "xfs_inode.h" | |
38 | #include "xfs_rw.h" | |
0b1b213f | 39 | #include "xfs_trace.h" |
1da177e4 | 40 | |
eb01c9cd | 41 | kmem_zone_t *xfs_log_ticket_zone; |
1da177e4 | 42 | |
1da177e4 | 43 | /* Local miscellaneous function prototypes */ |
55b66332 | 44 | STATIC int xlog_commit_record(struct log *log, struct xlog_ticket *ticket, |
1da177e4 LT |
45 | xlog_in_core_t **, xfs_lsn_t *); |
46 | STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp, | |
47 | xfs_buftarg_t *log_target, | |
48 | xfs_daddr_t blk_offset, | |
49 | int num_bblks); | |
50 | STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes); | |
51 | STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog); | |
c41564b5 | 52 | STATIC void xlog_dealloc_log(xlog_t *log); |
1da177e4 LT |
53 | |
54 | /* local state machine functions */ | |
55 | STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); | |
56 | STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog); | |
57 | STATIC int xlog_state_get_iclog_space(xlog_t *log, | |
58 | int len, | |
59 | xlog_in_core_t **iclog, | |
60 | xlog_ticket_t *ticket, | |
61 | int *continued_write, | |
62 | int *logoffsetp); | |
1da177e4 LT |
63 | STATIC int xlog_state_release_iclog(xlog_t *log, |
64 | xlog_in_core_t *iclog); | |
65 | STATIC void xlog_state_switch_iclogs(xlog_t *log, | |
66 | xlog_in_core_t *iclog, | |
67 | int eventual_size); | |
1da177e4 LT |
68 | STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); |
69 | ||
70 | /* local functions to manipulate grant head */ | |
71 | STATIC int xlog_grant_log_space(xlog_t *log, | |
72 | xlog_ticket_t *xtic); | |
73 | STATIC void xlog_grant_push_ail(xfs_mount_t *mp, | |
74 | int need_bytes); | |
75 | STATIC void xlog_regrant_reserve_log_space(xlog_t *log, | |
76 | xlog_ticket_t *ticket); | |
77 | STATIC int xlog_regrant_write_log_space(xlog_t *log, | |
78 | xlog_ticket_t *ticket); | |
79 | STATIC void xlog_ungrant_log_space(xlog_t *log, | |
80 | xlog_ticket_t *ticket); | |
81 | ||
cfcbbbd0 | 82 | #if defined(DEBUG) |
e6b1f273 | 83 | STATIC void xlog_verify_dest_ptr(xlog_t *log, char *ptr); |
1da177e4 LT |
84 | STATIC void xlog_verify_grant_head(xlog_t *log, int equals); |
85 | STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, | |
86 | int count, boolean_t syncing); | |
87 | STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, | |
88 | xfs_lsn_t tail_lsn); | |
89 | #else | |
90 | #define xlog_verify_dest_ptr(a,b) | |
91 | #define xlog_verify_grant_head(a,b) | |
92 | #define xlog_verify_iclog(a,b,c,d) | |
93 | #define xlog_verify_tail_lsn(a,b,c) | |
94 | #endif | |
95 | ||
ba0f32d4 | 96 | STATIC int xlog_iclogs_empty(xlog_t *log); |
1da177e4 | 97 | |
dd954c69 CH |
98 | |
99 | static void | |
100 | xlog_ins_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) | |
101 | { | |
102 | if (*qp) { | |
103 | tic->t_next = (*qp); | |
104 | tic->t_prev = (*qp)->t_prev; | |
105 | (*qp)->t_prev->t_next = tic; | |
106 | (*qp)->t_prev = tic; | |
107 | } else { | |
108 | tic->t_prev = tic->t_next = tic; | |
109 | *qp = tic; | |
110 | } | |
111 | ||
112 | tic->t_flags |= XLOG_TIC_IN_Q; | |
113 | } | |
114 | ||
115 | static void | |
116 | xlog_del_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) | |
117 | { | |
118 | if (tic == tic->t_next) { | |
119 | *qp = NULL; | |
120 | } else { | |
121 | *qp = tic->t_next; | |
122 | tic->t_next->t_prev = tic->t_prev; | |
123 | tic->t_prev->t_next = tic->t_next; | |
124 | } | |
125 | ||
126 | tic->t_next = tic->t_prev = NULL; | |
127 | tic->t_flags &= ~XLOG_TIC_IN_Q; | |
128 | } | |
129 | ||
130 | static void | |
131 | xlog_grant_sub_space(struct log *log, int bytes) | |
132 | { | |
133 | log->l_grant_write_bytes -= bytes; | |
134 | if (log->l_grant_write_bytes < 0) { | |
135 | log->l_grant_write_bytes += log->l_logsize; | |
136 | log->l_grant_write_cycle--; | |
137 | } | |
138 | ||
139 | log->l_grant_reserve_bytes -= bytes; | |
140 | if ((log)->l_grant_reserve_bytes < 0) { | |
141 | log->l_grant_reserve_bytes += log->l_logsize; | |
142 | log->l_grant_reserve_cycle--; | |
143 | } | |
144 | ||
145 | } | |
146 | ||
147 | static void | |
148 | xlog_grant_add_space_write(struct log *log, int bytes) | |
149 | { | |
d729eae8 MN |
150 | int tmp = log->l_logsize - log->l_grant_write_bytes; |
151 | if (tmp > bytes) | |
152 | log->l_grant_write_bytes += bytes; | |
153 | else { | |
dd954c69 | 154 | log->l_grant_write_cycle++; |
d729eae8 | 155 | log->l_grant_write_bytes = bytes - tmp; |
dd954c69 CH |
156 | } |
157 | } | |
158 | ||
159 | static void | |
160 | xlog_grant_add_space_reserve(struct log *log, int bytes) | |
161 | { | |
d729eae8 MN |
162 | int tmp = log->l_logsize - log->l_grant_reserve_bytes; |
163 | if (tmp > bytes) | |
164 | log->l_grant_reserve_bytes += bytes; | |
165 | else { | |
dd954c69 | 166 | log->l_grant_reserve_cycle++; |
d729eae8 | 167 | log->l_grant_reserve_bytes = bytes - tmp; |
dd954c69 CH |
168 | } |
169 | } | |
170 | ||
171 | static inline void | |
172 | xlog_grant_add_space(struct log *log, int bytes) | |
173 | { | |
174 | xlog_grant_add_space_write(log, bytes); | |
175 | xlog_grant_add_space_reserve(log, bytes); | |
176 | } | |
177 | ||
0adba536 CH |
178 | static void |
179 | xlog_tic_reset_res(xlog_ticket_t *tic) | |
180 | { | |
181 | tic->t_res_num = 0; | |
182 | tic->t_res_arr_sum = 0; | |
183 | tic->t_res_num_ophdrs = 0; | |
184 | } | |
185 | ||
186 | static void | |
187 | xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) | |
188 | { | |
189 | if (tic->t_res_num == XLOG_TIC_LEN_MAX) { | |
190 | /* add to overflow and start again */ | |
191 | tic->t_res_o_flow += tic->t_res_arr_sum; | |
192 | tic->t_res_num = 0; | |
193 | tic->t_res_arr_sum = 0; | |
194 | } | |
195 | ||
196 | tic->t_res_arr[tic->t_res_num].r_len = len; | |
197 | tic->t_res_arr[tic->t_res_num].r_type = type; | |
198 | tic->t_res_arr_sum += len; | |
199 | tic->t_res_num++; | |
200 | } | |
dd954c69 | 201 | |
1da177e4 LT |
202 | /* |
203 | * NOTES: | |
204 | * | |
205 | * 1. currblock field gets updated at startup and after in-core logs | |
206 | * marked as with WANT_SYNC. | |
207 | */ | |
208 | ||
209 | /* | |
210 | * This routine is called when a user of a log manager ticket is done with | |
211 | * the reservation. If the ticket was ever used, then a commit record for | |
212 | * the associated transaction is written out as a log operation header with | |
213 | * no data. The flag XLOG_TIC_INITED is set when the first write occurs with | |
214 | * a given ticket. If the ticket was one with a permanent reservation, then | |
215 | * a few operations are done differently. Permanent reservation tickets by | |
216 | * default don't release the reservation. They just commit the current | |
217 | * transaction with the belief that the reservation is still needed. A flag | |
218 | * must be passed in before permanent reservations are actually released. | |
219 | * When these type of tickets are not released, they need to be set into | |
220 | * the inited state again. By doing this, a start record will be written | |
221 | * out when the next write occurs. | |
222 | */ | |
223 | xfs_lsn_t | |
35a8a72f CH |
224 | xfs_log_done( |
225 | struct xfs_mount *mp, | |
226 | struct xlog_ticket *ticket, | |
227 | struct xlog_in_core **iclog, | |
228 | uint flags) | |
1da177e4 | 229 | { |
35a8a72f CH |
230 | struct log *log = mp->m_log; |
231 | xfs_lsn_t lsn = 0; | |
1da177e4 | 232 | |
1da177e4 LT |
233 | if (XLOG_FORCED_SHUTDOWN(log) || |
234 | /* | |
235 | * If nothing was ever written, don't write out commit record. | |
236 | * If we get an error, just continue and give back the log ticket. | |
237 | */ | |
238 | (((ticket->t_flags & XLOG_TIC_INITED) == 0) && | |
55b66332 | 239 | (xlog_commit_record(log, ticket, iclog, &lsn)))) { |
1da177e4 LT |
240 | lsn = (xfs_lsn_t) -1; |
241 | if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { | |
242 | flags |= XFS_LOG_REL_PERM_RESERV; | |
243 | } | |
244 | } | |
245 | ||
246 | ||
247 | if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || | |
248 | (flags & XFS_LOG_REL_PERM_RESERV)) { | |
0b1b213f CH |
249 | trace_xfs_log_done_nonperm(log, ticket); |
250 | ||
1da177e4 | 251 | /* |
c41564b5 | 252 | * Release ticket if not permanent reservation or a specific |
1da177e4 LT |
253 | * request has been made to release a permanent reservation. |
254 | */ | |
255 | xlog_ungrant_log_space(log, ticket); | |
cc09c0dc | 256 | xfs_log_ticket_put(ticket); |
1da177e4 | 257 | } else { |
0b1b213f CH |
258 | trace_xfs_log_done_perm(log, ticket); |
259 | ||
1da177e4 | 260 | xlog_regrant_reserve_log_space(log, ticket); |
c6a7b0f8 LM |
261 | /* If this ticket was a permanent reservation and we aren't |
262 | * trying to release it, reset the inited flags; so next time | |
263 | * we write, a start record will be written out. | |
264 | */ | |
1da177e4 | 265 | ticket->t_flags |= XLOG_TIC_INITED; |
c6a7b0f8 | 266 | } |
1da177e4 LT |
267 | |
268 | return lsn; | |
35a8a72f | 269 | } |
1da177e4 | 270 | |
1da177e4 LT |
271 | /* |
272 | * Attaches a new iclog I/O completion callback routine during | |
273 | * transaction commit. If the log is in error state, a non-zero | |
274 | * return code is handed back and the caller is responsible for | |
275 | * executing the callback at an appropriate time. | |
276 | */ | |
277 | int | |
35a8a72f CH |
278 | xfs_log_notify( |
279 | struct xfs_mount *mp, | |
280 | struct xlog_in_core *iclog, | |
281 | xfs_log_callback_t *cb) | |
1da177e4 | 282 | { |
b22cd72c | 283 | int abortflg; |
1da177e4 | 284 | |
114d23aa | 285 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
286 | abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); |
287 | if (!abortflg) { | |
288 | ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || | |
289 | (iclog->ic_state == XLOG_STATE_WANT_SYNC)); | |
290 | cb->cb_next = NULL; | |
291 | *(iclog->ic_callback_tail) = cb; | |
292 | iclog->ic_callback_tail = &(cb->cb_next); | |
293 | } | |
114d23aa | 294 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 | 295 | return abortflg; |
35a8a72f | 296 | } |
1da177e4 LT |
297 | |
298 | int | |
35a8a72f CH |
299 | xfs_log_release_iclog( |
300 | struct xfs_mount *mp, | |
301 | struct xlog_in_core *iclog) | |
1da177e4 | 302 | { |
35a8a72f | 303 | if (xlog_state_release_iclog(mp->m_log, iclog)) { |
7d04a335 | 304 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 305 | return EIO; |
1da177e4 LT |
306 | } |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | /* | |
312 | * 1. Reserve an amount of on-disk log space and return a ticket corresponding | |
313 | * to the reservation. | |
314 | * 2. Potentially, push buffers at tail of log to disk. | |
315 | * | |
316 | * Each reservation is going to reserve extra space for a log record header. | |
317 | * When writes happen to the on-disk log, we don't subtract the length of the | |
318 | * log record header from any reservation. By wasting space in each | |
319 | * reservation, we prevent over allocation problems. | |
320 | */ | |
321 | int | |
35a8a72f CH |
322 | xfs_log_reserve( |
323 | struct xfs_mount *mp, | |
324 | int unit_bytes, | |
325 | int cnt, | |
326 | struct xlog_ticket **ticket, | |
327 | __uint8_t client, | |
328 | uint flags, | |
329 | uint t_type) | |
1da177e4 | 330 | { |
35a8a72f CH |
331 | struct log *log = mp->m_log; |
332 | struct xlog_ticket *internal_ticket; | |
333 | int retval = 0; | |
1da177e4 | 334 | |
1da177e4 LT |
335 | ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); |
336 | ASSERT((flags & XFS_LOG_NOSLEEP) == 0); | |
337 | ||
338 | if (XLOG_FORCED_SHUTDOWN(log)) | |
339 | return XFS_ERROR(EIO); | |
340 | ||
341 | XFS_STATS_INC(xs_try_logspace); | |
342 | ||
0b1b213f | 343 | |
1da177e4 LT |
344 | if (*ticket != NULL) { |
345 | ASSERT(flags & XFS_LOG_PERM_RESERV); | |
35a8a72f | 346 | internal_ticket = *ticket; |
0b1b213f | 347 | |
524ee36f DC |
348 | /* |
349 | * this is a new transaction on the ticket, so we need to | |
350 | * change the transaction ID so that the next transaction has a | |
351 | * different TID in the log. Just add one to the existing tid | |
352 | * so that we can see chains of rolling transactions in the log | |
353 | * easily. | |
354 | */ | |
355 | internal_ticket->t_tid++; | |
356 | ||
0b1b213f CH |
357 | trace_xfs_log_reserve(log, internal_ticket); |
358 | ||
1da177e4 LT |
359 | xlog_grant_push_ail(mp, internal_ticket->t_unit_res); |
360 | retval = xlog_regrant_write_log_space(log, internal_ticket); | |
361 | } else { | |
362 | /* may sleep if need to allocate more tickets */ | |
cc09c0dc | 363 | internal_ticket = xlog_ticket_alloc(log, unit_bytes, cnt, |
3383ca57 DC |
364 | client, flags, |
365 | KM_SLEEP|KM_MAYFAIL); | |
eb01c9cd DC |
366 | if (!internal_ticket) |
367 | return XFS_ERROR(ENOMEM); | |
7e9c6396 | 368 | internal_ticket->t_trans_type = t_type; |
1da177e4 | 369 | *ticket = internal_ticket; |
0b1b213f CH |
370 | |
371 | trace_xfs_log_reserve(log, internal_ticket); | |
372 | ||
1da177e4 LT |
373 | xlog_grant_push_ail(mp, |
374 | (internal_ticket->t_unit_res * | |
375 | internal_ticket->t_cnt)); | |
376 | retval = xlog_grant_log_space(log, internal_ticket); | |
377 | } | |
378 | ||
379 | return retval; | |
380 | } /* xfs_log_reserve */ | |
381 | ||
382 | ||
383 | /* | |
384 | * Mount a log filesystem | |
385 | * | |
386 | * mp - ubiquitous xfs mount point structure | |
387 | * log_target - buftarg of on-disk log device | |
388 | * blk_offset - Start block # where block size is 512 bytes (BBSIZE) | |
389 | * num_bblocks - Number of BBSIZE blocks in on-disk log | |
390 | * | |
391 | * Return error or zero. | |
392 | */ | |
393 | int | |
249a8c11 DC |
394 | xfs_log_mount( |
395 | xfs_mount_t *mp, | |
396 | xfs_buftarg_t *log_target, | |
397 | xfs_daddr_t blk_offset, | |
398 | int num_bblks) | |
1da177e4 | 399 | { |
249a8c11 DC |
400 | int error; |
401 | ||
1da177e4 LT |
402 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) |
403 | cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); | |
404 | else { | |
405 | cmn_err(CE_NOTE, | |
406 | "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", | |
407 | mp->m_fsname); | |
bd186aa9 | 408 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
409 | } |
410 | ||
411 | mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); | |
a6cb767e DC |
412 | if (IS_ERR(mp->m_log)) { |
413 | error = -PTR_ERR(mp->m_log); | |
644c3567 DC |
414 | goto out; |
415 | } | |
1da177e4 | 416 | |
249a8c11 DC |
417 | /* |
418 | * Initialize the AIL now we have a log. | |
419 | */ | |
249a8c11 DC |
420 | error = xfs_trans_ail_init(mp); |
421 | if (error) { | |
422 | cmn_err(CE_WARN, "XFS: AIL initialisation failed: error %d", error); | |
26430752 | 423 | goto out_free_log; |
249a8c11 | 424 | } |
a9c21c1b | 425 | mp->m_log->l_ailp = mp->m_ail; |
249a8c11 | 426 | |
1da177e4 LT |
427 | /* |
428 | * skip log recovery on a norecovery mount. pretend it all | |
429 | * just worked. | |
430 | */ | |
431 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { | |
249a8c11 | 432 | int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
433 | |
434 | if (readonly) | |
bd186aa9 | 435 | mp->m_flags &= ~XFS_MOUNT_RDONLY; |
1da177e4 | 436 | |
65be6054 | 437 | error = xlog_recover(mp->m_log); |
1da177e4 LT |
438 | |
439 | if (readonly) | |
bd186aa9 | 440 | mp->m_flags |= XFS_MOUNT_RDONLY; |
1da177e4 LT |
441 | if (error) { |
442 | cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); | |
26430752 | 443 | goto out_destroy_ail; |
1da177e4 LT |
444 | } |
445 | } | |
446 | ||
447 | /* Normal transactions can now occur */ | |
448 | mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; | |
449 | ||
71e330b5 DC |
450 | /* |
451 | * Now the log has been fully initialised and we know were our | |
452 | * space grant counters are, we can initialise the permanent ticket | |
453 | * needed for delayed logging to work. | |
454 | */ | |
455 | xlog_cil_init_post_recovery(mp->m_log); | |
456 | ||
1da177e4 | 457 | return 0; |
26430752 CH |
458 | |
459 | out_destroy_ail: | |
460 | xfs_trans_ail_destroy(mp); | |
461 | out_free_log: | |
462 | xlog_dealloc_log(mp->m_log); | |
644c3567 | 463 | out: |
249a8c11 | 464 | return error; |
26430752 | 465 | } |
1da177e4 LT |
466 | |
467 | /* | |
468 | * Finish the recovery of the file system. This is separate from | |
469 | * the xfs_log_mount() call, because it depends on the code in | |
470 | * xfs_mountfs() to read in the root and real-time bitmap inodes | |
471 | * between calling xfs_log_mount() and here. | |
472 | * | |
473 | * mp - ubiquitous xfs mount point structure | |
474 | */ | |
475 | int | |
4249023a | 476 | xfs_log_mount_finish(xfs_mount_t *mp) |
1da177e4 LT |
477 | { |
478 | int error; | |
479 | ||
480 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) | |
4249023a | 481 | error = xlog_recover_finish(mp->m_log); |
1da177e4 LT |
482 | else { |
483 | error = 0; | |
bd186aa9 | 484 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
485 | } |
486 | ||
487 | return error; | |
488 | } | |
489 | ||
1da177e4 LT |
490 | /* |
491 | * Final log writes as part of unmount. | |
492 | * | |
493 | * Mark the filesystem clean as unmount happens. Note that during relocation | |
494 | * this routine needs to be executed as part of source-bag while the | |
495 | * deallocation must not be done until source-end. | |
496 | */ | |
497 | ||
498 | /* | |
499 | * Unmount record used to have a string "Unmount filesystem--" in the | |
500 | * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). | |
501 | * We just write the magic number now since that particular field isn't | |
502 | * currently architecture converted and "nUmount" is a bit foo. | |
503 | * As far as I know, there weren't any dependencies on the old behaviour. | |
504 | */ | |
505 | ||
506 | int | |
507 | xfs_log_unmount_write(xfs_mount_t *mp) | |
508 | { | |
509 | xlog_t *log = mp->m_log; | |
510 | xlog_in_core_t *iclog; | |
511 | #ifdef DEBUG | |
512 | xlog_in_core_t *first_iclog; | |
513 | #endif | |
35a8a72f | 514 | xlog_ticket_t *tic = NULL; |
1da177e4 LT |
515 | xfs_lsn_t lsn; |
516 | int error; | |
1da177e4 | 517 | |
1da177e4 LT |
518 | /* |
519 | * Don't write out unmount record on read-only mounts. | |
520 | * Or, if we are doing a forced umount (typically because of IO errors). | |
521 | */ | |
bd186aa9 | 522 | if (mp->m_flags & XFS_MOUNT_RDONLY) |
1da177e4 LT |
523 | return 0; |
524 | ||
a14a348b | 525 | error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
b911ca04 | 526 | ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); |
1da177e4 LT |
527 | |
528 | #ifdef DEBUG | |
529 | first_iclog = iclog = log->l_iclog; | |
530 | do { | |
531 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
532 | ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); | |
533 | ASSERT(iclog->ic_offset == 0); | |
534 | } | |
535 | iclog = iclog->ic_next; | |
536 | } while (iclog != first_iclog); | |
537 | #endif | |
538 | if (! (XLOG_FORCED_SHUTDOWN(log))) { | |
955e47ad TS |
539 | error = xfs_log_reserve(mp, 600, 1, &tic, |
540 | XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); | |
1da177e4 | 541 | if (!error) { |
55b66332 DC |
542 | /* the data section must be 32 bit size aligned */ |
543 | struct { | |
544 | __uint16_t magic; | |
545 | __uint16_t pad1; | |
546 | __uint32_t pad2; /* may as well make it 64 bits */ | |
547 | } magic = { | |
548 | .magic = XLOG_UNMOUNT_TYPE, | |
549 | }; | |
550 | struct xfs_log_iovec reg = { | |
4e0d5f92 | 551 | .i_addr = &magic, |
55b66332 DC |
552 | .i_len = sizeof(magic), |
553 | .i_type = XLOG_REG_TYPE_UNMOUNT, | |
554 | }; | |
555 | struct xfs_log_vec vec = { | |
556 | .lv_niovecs = 1, | |
557 | .lv_iovecp = ®, | |
558 | }; | |
559 | ||
1da177e4 | 560 | /* remove inited flag */ |
55b66332 DC |
561 | tic->t_flags = 0; |
562 | error = xlog_write(log, &vec, tic, &lsn, | |
1da177e4 LT |
563 | NULL, XLOG_UNMOUNT_TRANS); |
564 | /* | |
565 | * At this point, we're umounting anyway, | |
566 | * so there's no point in transitioning log state | |
567 | * to IOERROR. Just continue... | |
568 | */ | |
569 | } | |
570 | ||
571 | if (error) { | |
572 | xfs_fs_cmn_err(CE_ALERT, mp, | |
573 | "xfs_log_unmount: unmount record failed"); | |
574 | } | |
575 | ||
576 | ||
b22cd72c | 577 | spin_lock(&log->l_icloglock); |
1da177e4 | 578 | iclog = log->l_iclog; |
155cc6b7 | 579 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 580 | xlog_state_want_sync(log, iclog); |
39e2defe | 581 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 582 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 583 | |
b22cd72c | 584 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
585 | if (!(iclog->ic_state == XLOG_STATE_ACTIVE || |
586 | iclog->ic_state == XLOG_STATE_DIRTY)) { | |
587 | if (!XLOG_FORCED_SHUTDOWN(log)) { | |
12017faf | 588 | sv_wait(&iclog->ic_force_wait, PMEM, |
1da177e4 LT |
589 | &log->l_icloglock, s); |
590 | } else { | |
b22cd72c | 591 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
592 | } |
593 | } else { | |
b22cd72c | 594 | spin_unlock(&log->l_icloglock); |
1da177e4 | 595 | } |
955e47ad | 596 | if (tic) { |
0b1b213f | 597 | trace_xfs_log_umount_write(log, tic); |
955e47ad | 598 | xlog_ungrant_log_space(log, tic); |
cc09c0dc | 599 | xfs_log_ticket_put(tic); |
955e47ad | 600 | } |
1da177e4 LT |
601 | } else { |
602 | /* | |
603 | * We're already in forced_shutdown mode, couldn't | |
604 | * even attempt to write out the unmount transaction. | |
605 | * | |
606 | * Go through the motions of sync'ing and releasing | |
607 | * the iclog, even though no I/O will actually happen, | |
c41564b5 | 608 | * we need to wait for other log I/Os that may already |
1da177e4 LT |
609 | * be in progress. Do this as a separate section of |
610 | * code so we'll know if we ever get stuck here that | |
611 | * we're in this odd situation of trying to unmount | |
612 | * a file system that went into forced_shutdown as | |
613 | * the result of an unmount.. | |
614 | */ | |
b22cd72c | 615 | spin_lock(&log->l_icloglock); |
1da177e4 | 616 | iclog = log->l_iclog; |
155cc6b7 | 617 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 LT |
618 | |
619 | xlog_state_want_sync(log, iclog); | |
39e2defe | 620 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 621 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 622 | |
b22cd72c | 623 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
624 | |
625 | if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE | |
626 | || iclog->ic_state == XLOG_STATE_DIRTY | |
627 | || iclog->ic_state == XLOG_STATE_IOERROR) ) { | |
628 | ||
12017faf | 629 | sv_wait(&iclog->ic_force_wait, PMEM, |
1da177e4 LT |
630 | &log->l_icloglock, s); |
631 | } else { | |
b22cd72c | 632 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
633 | } |
634 | } | |
635 | ||
1bb7d6b5 | 636 | return error; |
1da177e4 LT |
637 | } /* xfs_log_unmount_write */ |
638 | ||
639 | /* | |
640 | * Deallocate log structures for unmount/relocation. | |
249a8c11 DC |
641 | * |
642 | * We need to stop the aild from running before we destroy | |
643 | * and deallocate the log as the aild references the log. | |
1da177e4 LT |
644 | */ |
645 | void | |
21b699c8 | 646 | xfs_log_unmount(xfs_mount_t *mp) |
1da177e4 | 647 | { |
249a8c11 | 648 | xfs_trans_ail_destroy(mp); |
c41564b5 | 649 | xlog_dealloc_log(mp->m_log); |
1da177e4 LT |
650 | } |
651 | ||
43f5efc5 DC |
652 | void |
653 | xfs_log_item_init( | |
654 | struct xfs_mount *mp, | |
655 | struct xfs_log_item *item, | |
656 | int type, | |
657 | struct xfs_item_ops *ops) | |
658 | { | |
659 | item->li_mountp = mp; | |
660 | item->li_ailp = mp->m_ail; | |
661 | item->li_type = type; | |
662 | item->li_ops = ops; | |
71e330b5 DC |
663 | item->li_lv = NULL; |
664 | ||
665 | INIT_LIST_HEAD(&item->li_ail); | |
666 | INIT_LIST_HEAD(&item->li_cil); | |
43f5efc5 DC |
667 | } |
668 | ||
1da177e4 LT |
669 | /* |
670 | * Write region vectors to log. The write happens using the space reservation | |
671 | * of the ticket (tic). It is not a requirement that all writes for a given | |
9b9fc2b7 DC |
672 | * transaction occur with one call to xfs_log_write(). However, it is important |
673 | * to note that the transaction reservation code makes an assumption about the | |
674 | * number of log headers a transaction requires that may be violated if you | |
675 | * don't pass all the transaction vectors in one call.... | |
1da177e4 LT |
676 | */ |
677 | int | |
35a8a72f CH |
678 | xfs_log_write( |
679 | struct xfs_mount *mp, | |
680 | struct xfs_log_iovec reg[], | |
681 | int nentries, | |
682 | struct xlog_ticket *tic, | |
683 | xfs_lsn_t *start_lsn) | |
1da177e4 | 684 | { |
35a8a72f CH |
685 | struct log *log = mp->m_log; |
686 | int error; | |
55b66332 DC |
687 | struct xfs_log_vec vec = { |
688 | .lv_niovecs = nentries, | |
689 | .lv_iovecp = reg, | |
690 | }; | |
1da177e4 | 691 | |
1da177e4 LT |
692 | if (XLOG_FORCED_SHUTDOWN(log)) |
693 | return XFS_ERROR(EIO); | |
694 | ||
55b66332 | 695 | error = xlog_write(log, &vec, tic, start_lsn, NULL, 0); |
35a8a72f | 696 | if (error) |
7d04a335 | 697 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 698 | return error; |
35a8a72f | 699 | } |
1da177e4 LT |
700 | |
701 | void | |
702 | xfs_log_move_tail(xfs_mount_t *mp, | |
703 | xfs_lsn_t tail_lsn) | |
704 | { | |
705 | xlog_ticket_t *tic; | |
706 | xlog_t *log = mp->m_log; | |
707 | int need_bytes, free_bytes, cycle, bytes; | |
1da177e4 | 708 | |
1da177e4 LT |
709 | if (XLOG_FORCED_SHUTDOWN(log)) |
710 | return; | |
1da177e4 LT |
711 | |
712 | if (tail_lsn == 0) { | |
713 | /* needed since sync_lsn is 64 bits */ | |
b22cd72c | 714 | spin_lock(&log->l_icloglock); |
1da177e4 | 715 | tail_lsn = log->l_last_sync_lsn; |
b22cd72c | 716 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
717 | } |
718 | ||
c8b5ea28 | 719 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
720 | |
721 | /* Also an invalid lsn. 1 implies that we aren't passing in a valid | |
722 | * tail_lsn. | |
723 | */ | |
724 | if (tail_lsn != 1) { | |
725 | log->l_tail_lsn = tail_lsn; | |
726 | } | |
727 | ||
728 | if ((tic = log->l_write_headq)) { | |
729 | #ifdef DEBUG | |
730 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
731 | panic("Recovery problem"); | |
732 | #endif | |
733 | cycle = log->l_grant_write_cycle; | |
734 | bytes = log->l_grant_write_bytes; | |
735 | free_bytes = xlog_space_left(log, cycle, bytes); | |
736 | do { | |
737 | ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); | |
738 | ||
739 | if (free_bytes < tic->t_unit_res && tail_lsn != 1) | |
740 | break; | |
741 | tail_lsn = 0; | |
742 | free_bytes -= tic->t_unit_res; | |
12017faf | 743 | sv_signal(&tic->t_wait); |
1da177e4 LT |
744 | tic = tic->t_next; |
745 | } while (tic != log->l_write_headq); | |
746 | } | |
747 | if ((tic = log->l_reserve_headq)) { | |
748 | #ifdef DEBUG | |
749 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
750 | panic("Recovery problem"); | |
751 | #endif | |
752 | cycle = log->l_grant_reserve_cycle; | |
753 | bytes = log->l_grant_reserve_bytes; | |
754 | free_bytes = xlog_space_left(log, cycle, bytes); | |
755 | do { | |
756 | if (tic->t_flags & XLOG_TIC_PERM_RESERV) | |
757 | need_bytes = tic->t_unit_res*tic->t_cnt; | |
758 | else | |
759 | need_bytes = tic->t_unit_res; | |
760 | if (free_bytes < need_bytes && tail_lsn != 1) | |
761 | break; | |
762 | tail_lsn = 0; | |
763 | free_bytes -= need_bytes; | |
12017faf | 764 | sv_signal(&tic->t_wait); |
1da177e4 LT |
765 | tic = tic->t_next; |
766 | } while (tic != log->l_reserve_headq); | |
767 | } | |
c8b5ea28 | 768 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
769 | } /* xfs_log_move_tail */ |
770 | ||
771 | /* | |
772 | * Determine if we have a transaction that has gone to disk | |
b6f8dd49 DC |
773 | * that needs to be covered. To begin the transition to the idle state |
774 | * firstly the log needs to be idle (no AIL and nothing in the iclogs). | |
775 | * If we are then in a state where covering is needed, the caller is informed | |
776 | * that dummy transactions are required to move the log into the idle state. | |
777 | * | |
778 | * Because this is called as part of the sync process, we should also indicate | |
779 | * that dummy transactions should be issued in anything but the covered or | |
780 | * idle states. This ensures that the log tail is accurately reflected in | |
781 | * the log at the end of the sync, hence if a crash occurrs avoids replay | |
782 | * of transactions where the metadata is already on disk. | |
1da177e4 LT |
783 | */ |
784 | int | |
785 | xfs_log_need_covered(xfs_mount_t *mp) | |
786 | { | |
27d8d5fe | 787 | int needed = 0; |
1da177e4 | 788 | xlog_t *log = mp->m_log; |
1da177e4 | 789 | |
92821e2b | 790 | if (!xfs_fs_writable(mp)) |
1da177e4 LT |
791 | return 0; |
792 | ||
b22cd72c | 793 | spin_lock(&log->l_icloglock); |
b6f8dd49 DC |
794 | switch (log->l_covered_state) { |
795 | case XLOG_STATE_COVER_DONE: | |
796 | case XLOG_STATE_COVER_DONE2: | |
797 | case XLOG_STATE_COVER_IDLE: | |
798 | break; | |
799 | case XLOG_STATE_COVER_NEED: | |
800 | case XLOG_STATE_COVER_NEED2: | |
801 | if (!xfs_trans_ail_tail(log->l_ailp) && | |
802 | xlog_iclogs_empty(log)) { | |
803 | if (log->l_covered_state == XLOG_STATE_COVER_NEED) | |
804 | log->l_covered_state = XLOG_STATE_COVER_DONE; | |
805 | else | |
806 | log->l_covered_state = XLOG_STATE_COVER_DONE2; | |
1da177e4 | 807 | } |
b6f8dd49 DC |
808 | /* FALLTHRU */ |
809 | default: | |
1da177e4 | 810 | needed = 1; |
b6f8dd49 | 811 | break; |
1da177e4 | 812 | } |
b22cd72c | 813 | spin_unlock(&log->l_icloglock); |
014c2544 | 814 | return needed; |
1da177e4 LT |
815 | } |
816 | ||
817 | /****************************************************************************** | |
818 | * | |
819 | * local routines | |
820 | * | |
821 | ****************************************************************************** | |
822 | */ | |
823 | ||
824 | /* xfs_trans_tail_ail returns 0 when there is nothing in the list. | |
825 | * The log manager must keep track of the last LR which was committed | |
826 | * to disk. The lsn of this LR will become the new tail_lsn whenever | |
827 | * xfs_trans_tail_ail returns 0. If we don't do this, we run into | |
828 | * the situation where stuff could be written into the log but nothing | |
829 | * was ever in the AIL when asked. Eventually, we panic since the | |
830 | * tail hits the head. | |
831 | * | |
832 | * We may be holding the log iclog lock upon entering this routine. | |
833 | */ | |
834 | xfs_lsn_t | |
835 | xlog_assign_tail_lsn(xfs_mount_t *mp) | |
836 | { | |
837 | xfs_lsn_t tail_lsn; | |
1da177e4 LT |
838 | xlog_t *log = mp->m_log; |
839 | ||
5b00f14f | 840 | tail_lsn = xfs_trans_ail_tail(mp->m_ail); |
c8b5ea28 | 841 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
842 | if (tail_lsn != 0) { |
843 | log->l_tail_lsn = tail_lsn; | |
844 | } else { | |
845 | tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; | |
846 | } | |
c8b5ea28 | 847 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
848 | |
849 | return tail_lsn; | |
850 | } /* xlog_assign_tail_lsn */ | |
851 | ||
852 | ||
853 | /* | |
854 | * Return the space in the log between the tail and the head. The head | |
855 | * is passed in the cycle/bytes formal parms. In the special case where | |
856 | * the reserve head has wrapped passed the tail, this calculation is no | |
857 | * longer valid. In this case, just return 0 which means there is no space | |
858 | * in the log. This works for all places where this function is called | |
859 | * with the reserve head. Of course, if the write head were to ever | |
860 | * wrap the tail, we should blow up. Rather than catch this case here, | |
861 | * we depend on other ASSERTions in other parts of the code. XXXmiken | |
862 | * | |
863 | * This code also handles the case where the reservation head is behind | |
864 | * the tail. The details of this case are described below, but the end | |
865 | * result is that we return the size of the log as the amount of space left. | |
866 | */ | |
a8272ce0 | 867 | STATIC int |
1da177e4 LT |
868 | xlog_space_left(xlog_t *log, int cycle, int bytes) |
869 | { | |
870 | int free_bytes; | |
871 | int tail_bytes; | |
872 | int tail_cycle; | |
873 | ||
874 | tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); | |
875 | tail_cycle = CYCLE_LSN(log->l_tail_lsn); | |
876 | if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { | |
877 | free_bytes = log->l_logsize - (bytes - tail_bytes); | |
878 | } else if ((tail_cycle + 1) < cycle) { | |
879 | return 0; | |
880 | } else if (tail_cycle < cycle) { | |
881 | ASSERT(tail_cycle == (cycle - 1)); | |
882 | free_bytes = tail_bytes - bytes; | |
883 | } else { | |
884 | /* | |
885 | * The reservation head is behind the tail. | |
886 | * In this case we just want to return the size of the | |
887 | * log as the amount of space left. | |
888 | */ | |
889 | xfs_fs_cmn_err(CE_ALERT, log->l_mp, | |
890 | "xlog_space_left: head behind tail\n" | |
891 | " tail_cycle = %d, tail_bytes = %d\n" | |
892 | " GH cycle = %d, GH bytes = %d", | |
893 | tail_cycle, tail_bytes, cycle, bytes); | |
894 | ASSERT(0); | |
895 | free_bytes = log->l_logsize; | |
896 | } | |
897 | return free_bytes; | |
898 | } /* xlog_space_left */ | |
899 | ||
900 | ||
901 | /* | |
902 | * Log function which is called when an io completes. | |
903 | * | |
904 | * The log manager needs its own routine, in order to control what | |
905 | * happens with the buffer after the write completes. | |
906 | */ | |
907 | void | |
908 | xlog_iodone(xfs_buf_t *bp) | |
909 | { | |
910 | xlog_in_core_t *iclog; | |
911 | xlog_t *l; | |
912 | int aborted; | |
913 | ||
914 | iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); | |
915 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); | |
916 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); | |
917 | aborted = 0; | |
1da177e4 LT |
918 | l = iclog->ic_log; |
919 | ||
0bfefc46 | 920 | /* |
73f6aa4d CH |
921 | * If the _XFS_BARRIER_FAILED flag was set by a lower |
922 | * layer, it means the underlying device no longer supports | |
0bfefc46 DC |
923 | * barrier I/O. Warn loudly and turn off barriers. |
924 | */ | |
73f6aa4d CH |
925 | if (bp->b_flags & _XFS_BARRIER_FAILED) { |
926 | bp->b_flags &= ~_XFS_BARRIER_FAILED; | |
0bfefc46 DC |
927 | l->l_mp->m_flags &= ~XFS_MOUNT_BARRIER; |
928 | xfs_fs_cmn_err(CE_WARN, l->l_mp, | |
929 | "xlog_iodone: Barriers are no longer supported" | |
930 | " by device. Disabling barriers\n"); | |
0bfefc46 DC |
931 | } |
932 | ||
1da177e4 LT |
933 | /* |
934 | * Race to shutdown the filesystem if we see an error. | |
935 | */ | |
936 | if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, | |
937 | XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { | |
938 | xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); | |
939 | XFS_BUF_STALE(bp); | |
7d04a335 | 940 | xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 LT |
941 | /* |
942 | * This flag will be propagated to the trans-committed | |
943 | * callback routines to let them know that the log-commit | |
944 | * didn't succeed. | |
945 | */ | |
946 | aborted = XFS_LI_ABORTED; | |
947 | } else if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
948 | aborted = XFS_LI_ABORTED; | |
949 | } | |
3db296f3 DC |
950 | |
951 | /* log I/O is always issued ASYNC */ | |
952 | ASSERT(XFS_BUF_ISASYNC(bp)); | |
1da177e4 | 953 | xlog_state_done_syncing(iclog, aborted); |
3db296f3 DC |
954 | /* |
955 | * do not reference the buffer (bp) here as we could race | |
956 | * with it being freed after writing the unmount record to the | |
957 | * log. | |
958 | */ | |
959 | ||
1da177e4 LT |
960 | } /* xlog_iodone */ |
961 | ||
1da177e4 LT |
962 | /* |
963 | * Return size of each in-core log record buffer. | |
964 | * | |
9da096fd | 965 | * All machines get 8 x 32kB buffers by default, unless tuned otherwise. |
1da177e4 LT |
966 | * |
967 | * If the filesystem blocksize is too large, we may need to choose a | |
968 | * larger size since the directory code currently logs entire blocks. | |
969 | */ | |
970 | ||
971 | STATIC void | |
972 | xlog_get_iclog_buffer_size(xfs_mount_t *mp, | |
973 | xlog_t *log) | |
974 | { | |
975 | int size; | |
976 | int xhdrs; | |
977 | ||
1cb51258 ES |
978 | if (mp->m_logbufs <= 0) |
979 | log->l_iclog_bufs = XLOG_MAX_ICLOGS; | |
980 | else | |
cfcbbbd0 | 981 | log->l_iclog_bufs = mp->m_logbufs; |
1da177e4 LT |
982 | |
983 | /* | |
984 | * Buffer size passed in from mount system call. | |
985 | */ | |
cfcbbbd0 | 986 | if (mp->m_logbsize > 0) { |
1da177e4 LT |
987 | size = log->l_iclog_size = mp->m_logbsize; |
988 | log->l_iclog_size_log = 0; | |
989 | while (size != 1) { | |
990 | log->l_iclog_size_log++; | |
991 | size >>= 1; | |
992 | } | |
993 | ||
62118709 | 994 | if (xfs_sb_version_haslogv2(&mp->m_sb)) { |
9da096fd MP |
995 | /* # headers = size / 32k |
996 | * one header holds cycles from 32k of data | |
1da177e4 LT |
997 | */ |
998 | ||
999 | xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; | |
1000 | if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) | |
1001 | xhdrs++; | |
1002 | log->l_iclog_hsize = xhdrs << BBSHIFT; | |
1003 | log->l_iclog_heads = xhdrs; | |
1004 | } else { | |
1005 | ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); | |
1006 | log->l_iclog_hsize = BBSIZE; | |
1007 | log->l_iclog_heads = 1; | |
1008 | } | |
cfcbbbd0 | 1009 | goto done; |
1da177e4 LT |
1010 | } |
1011 | ||
9da096fd | 1012 | /* All machines use 32kB buffers by default. */ |
1cb51258 ES |
1013 | log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; |
1014 | log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; | |
1da177e4 LT |
1015 | |
1016 | /* the default log size is 16k or 32k which is one header sector */ | |
1017 | log->l_iclog_hsize = BBSIZE; | |
1018 | log->l_iclog_heads = 1; | |
1019 | ||
7153f8ba CH |
1020 | done: |
1021 | /* are we being asked to make the sizes selected above visible? */ | |
cfcbbbd0 NS |
1022 | if (mp->m_logbufs == 0) |
1023 | mp->m_logbufs = log->l_iclog_bufs; | |
1024 | if (mp->m_logbsize == 0) | |
1025 | mp->m_logbsize = log->l_iclog_size; | |
1da177e4 LT |
1026 | } /* xlog_get_iclog_buffer_size */ |
1027 | ||
1028 | ||
1029 | /* | |
1030 | * This routine initializes some of the log structure for a given mount point. | |
1031 | * Its primary purpose is to fill in enough, so recovery can occur. However, | |
1032 | * some other stuff may be filled in too. | |
1033 | */ | |
1034 | STATIC xlog_t * | |
1035 | xlog_alloc_log(xfs_mount_t *mp, | |
1036 | xfs_buftarg_t *log_target, | |
1037 | xfs_daddr_t blk_offset, | |
1038 | int num_bblks) | |
1039 | { | |
1040 | xlog_t *log; | |
1041 | xlog_rec_header_t *head; | |
1042 | xlog_in_core_t **iclogp; | |
1043 | xlog_in_core_t *iclog, *prev_iclog=NULL; | |
1044 | xfs_buf_t *bp; | |
1045 | int i; | |
1046 | int iclogsize; | |
a6cb767e | 1047 | int error = ENOMEM; |
69ce58f0 | 1048 | uint log2_size = 0; |
1da177e4 | 1049 | |
644c3567 | 1050 | log = kmem_zalloc(sizeof(xlog_t), KM_MAYFAIL); |
a6cb767e DC |
1051 | if (!log) { |
1052 | xlog_warn("XFS: Log allocation failed: No memory!"); | |
1053 | goto out; | |
1054 | } | |
1da177e4 LT |
1055 | |
1056 | log->l_mp = mp; | |
1057 | log->l_targ = log_target; | |
1058 | log->l_logsize = BBTOB(num_bblks); | |
1059 | log->l_logBBstart = blk_offset; | |
1060 | log->l_logBBsize = num_bblks; | |
1061 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1062 | log->l_flags |= XLOG_ACTIVE_RECOVERY; | |
1063 | ||
1064 | log->l_prev_block = -1; | |
03bea6fe | 1065 | log->l_tail_lsn = xlog_assign_lsn(1, 0); |
1da177e4 LT |
1066 | /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ |
1067 | log->l_last_sync_lsn = log->l_tail_lsn; | |
1068 | log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ | |
1069 | log->l_grant_reserve_cycle = 1; | |
1070 | log->l_grant_write_cycle = 1; | |
1071 | ||
a6cb767e | 1072 | error = EFSCORRUPTED; |
62118709 | 1073 | if (xfs_sb_version_hassector(&mp->m_sb)) { |
69ce58f0 AE |
1074 | log2_size = mp->m_sb.sb_logsectlog; |
1075 | if (log2_size < BBSHIFT) { | |
1076 | xlog_warn("XFS: Log sector size too small " | |
1077 | "(0x%x < 0x%x)", log2_size, BBSHIFT); | |
a6cb767e DC |
1078 | goto out_free_log; |
1079 | } | |
1080 | ||
69ce58f0 AE |
1081 | log2_size -= BBSHIFT; |
1082 | if (log2_size > mp->m_sectbb_log) { | |
1083 | xlog_warn("XFS: Log sector size too large " | |
1084 | "(0x%x > 0x%x)", log2_size, mp->m_sectbb_log); | |
a6cb767e DC |
1085 | goto out_free_log; |
1086 | } | |
69ce58f0 AE |
1087 | |
1088 | /* for larger sector sizes, must have v2 or external log */ | |
1089 | if (log2_size && log->l_logBBstart > 0 && | |
1090 | !xfs_sb_version_haslogv2(&mp->m_sb)) { | |
1091 | ||
1092 | xlog_warn("XFS: log sector size (0x%x) invalid " | |
1093 | "for configuration.", log2_size); | |
a6cb767e DC |
1094 | goto out_free_log; |
1095 | } | |
1da177e4 | 1096 | } |
69ce58f0 | 1097 | log->l_sectBBsize = 1 << log2_size; |
1da177e4 LT |
1098 | |
1099 | xlog_get_iclog_buffer_size(mp, log); | |
1100 | ||
a6cb767e | 1101 | error = ENOMEM; |
1da177e4 | 1102 | bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); |
644c3567 DC |
1103 | if (!bp) |
1104 | goto out_free_log; | |
1da177e4 | 1105 | XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); |
1da177e4 LT |
1106 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); |
1107 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
1108 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
1109 | log->l_xbuf = bp; | |
1110 | ||
007c61c6 ES |
1111 | spin_lock_init(&log->l_icloglock); |
1112 | spin_lock_init(&log->l_grant_lock); | |
d748c623 | 1113 | sv_init(&log->l_flush_wait, 0, "flush_wait"); |
1da177e4 LT |
1114 | |
1115 | /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ | |
1116 | ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); | |
1117 | ||
1118 | iclogp = &log->l_iclog; | |
1119 | /* | |
1120 | * The amount of memory to allocate for the iclog structure is | |
1121 | * rather funky due to the way the structure is defined. It is | |
1122 | * done this way so that we can use different sizes for machines | |
1123 | * with different amounts of memory. See the definition of | |
1124 | * xlog_in_core_t in xfs_log_priv.h for details. | |
1125 | */ | |
1126 | iclogsize = log->l_iclog_size; | |
1127 | ASSERT(log->l_iclog_size >= 4096); | |
1128 | for (i=0; i < log->l_iclog_bufs; i++) { | |
644c3567 DC |
1129 | *iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL); |
1130 | if (!*iclogp) | |
1131 | goto out_free_iclog; | |
1132 | ||
1da177e4 | 1133 | iclog = *iclogp; |
1da177e4 LT |
1134 | iclog->ic_prev = prev_iclog; |
1135 | prev_iclog = iclog; | |
1fa40b01 CH |
1136 | |
1137 | bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp); | |
644c3567 DC |
1138 | if (!bp) |
1139 | goto out_free_iclog; | |
1fa40b01 CH |
1140 | if (!XFS_BUF_CPSEMA(bp)) |
1141 | ASSERT(0); | |
1142 | XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); | |
1fa40b01 CH |
1143 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); |
1144 | iclog->ic_bp = bp; | |
b28708d6 | 1145 | iclog->ic_data = bp->b_addr; |
4679b2d3 | 1146 | #ifdef DEBUG |
1da177e4 | 1147 | log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); |
4679b2d3 | 1148 | #endif |
1da177e4 LT |
1149 | head = &iclog->ic_header; |
1150 | memset(head, 0, sizeof(xlog_rec_header_t)); | |
b53e675d CH |
1151 | head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); |
1152 | head->h_version = cpu_to_be32( | |
62118709 | 1153 | xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); |
b53e675d | 1154 | head->h_size = cpu_to_be32(log->l_iclog_size); |
1da177e4 | 1155 | /* new fields */ |
b53e675d | 1156 | head->h_fmt = cpu_to_be32(XLOG_FMT); |
1da177e4 LT |
1157 | memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); |
1158 | ||
1da177e4 LT |
1159 | iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; |
1160 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
1161 | iclog->ic_log = log; | |
114d23aa DC |
1162 | atomic_set(&iclog->ic_refcnt, 0); |
1163 | spin_lock_init(&iclog->ic_callback_lock); | |
1da177e4 | 1164 | iclog->ic_callback_tail = &(iclog->ic_callback); |
b28708d6 | 1165 | iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; |
1da177e4 LT |
1166 | |
1167 | ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); | |
1168 | ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); | |
12017faf DC |
1169 | sv_init(&iclog->ic_force_wait, SV_DEFAULT, "iclog-force"); |
1170 | sv_init(&iclog->ic_write_wait, SV_DEFAULT, "iclog-write"); | |
1da177e4 LT |
1171 | |
1172 | iclogp = &iclog->ic_next; | |
1173 | } | |
1174 | *iclogp = log->l_iclog; /* complete ring */ | |
1175 | log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ | |
1176 | ||
71e330b5 DC |
1177 | error = xlog_cil_init(log); |
1178 | if (error) | |
1179 | goto out_free_iclog; | |
1da177e4 | 1180 | return log; |
644c3567 DC |
1181 | |
1182 | out_free_iclog: | |
1183 | for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { | |
1184 | prev_iclog = iclog->ic_next; | |
1185 | if (iclog->ic_bp) { | |
1186 | sv_destroy(&iclog->ic_force_wait); | |
1187 | sv_destroy(&iclog->ic_write_wait); | |
1188 | xfs_buf_free(iclog->ic_bp); | |
644c3567 DC |
1189 | } |
1190 | kmem_free(iclog); | |
1191 | } | |
1192 | spinlock_destroy(&log->l_icloglock); | |
1193 | spinlock_destroy(&log->l_grant_lock); | |
644c3567 DC |
1194 | xfs_buf_free(log->l_xbuf); |
1195 | out_free_log: | |
1196 | kmem_free(log); | |
a6cb767e DC |
1197 | out: |
1198 | return ERR_PTR(-error); | |
1da177e4 LT |
1199 | } /* xlog_alloc_log */ |
1200 | ||
1201 | ||
1202 | /* | |
1203 | * Write out the commit record of a transaction associated with the given | |
1204 | * ticket. Return the lsn of the commit record. | |
1205 | */ | |
1206 | STATIC int | |
55b66332 DC |
1207 | xlog_commit_record( |
1208 | struct log *log, | |
1209 | struct xlog_ticket *ticket, | |
1210 | struct xlog_in_core **iclog, | |
1211 | xfs_lsn_t *commitlsnp) | |
1da177e4 | 1212 | { |
55b66332 DC |
1213 | struct xfs_mount *mp = log->l_mp; |
1214 | int error; | |
1215 | struct xfs_log_iovec reg = { | |
1216 | .i_addr = NULL, | |
1217 | .i_len = 0, | |
1218 | .i_type = XLOG_REG_TYPE_COMMIT, | |
1219 | }; | |
1220 | struct xfs_log_vec vec = { | |
1221 | .lv_niovecs = 1, | |
1222 | .lv_iovecp = ®, | |
1223 | }; | |
1da177e4 LT |
1224 | |
1225 | ASSERT_ALWAYS(iclog); | |
55b66332 DC |
1226 | error = xlog_write(log, &vec, ticket, commitlsnp, iclog, |
1227 | XLOG_COMMIT_TRANS); | |
1228 | if (error) | |
7d04a335 | 1229 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 1230 | return error; |
55b66332 | 1231 | } |
1da177e4 LT |
1232 | |
1233 | /* | |
1234 | * Push on the buffer cache code if we ever use more than 75% of the on-disk | |
1235 | * log space. This code pushes on the lsn which would supposedly free up | |
1236 | * the 25% which we want to leave free. We may need to adopt a policy which | |
1237 | * pushes on an lsn which is further along in the log once we reach the high | |
1238 | * water mark. In this manner, we would be creating a low water mark. | |
1239 | */ | |
a8272ce0 | 1240 | STATIC void |
1da177e4 LT |
1241 | xlog_grant_push_ail(xfs_mount_t *mp, |
1242 | int need_bytes) | |
1243 | { | |
1244 | xlog_t *log = mp->m_log; /* pointer to the log */ | |
1245 | xfs_lsn_t tail_lsn; /* lsn of the log tail */ | |
1246 | xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ | |
1247 | int free_blocks; /* free blocks left to write to */ | |
1248 | int free_bytes; /* free bytes left to write to */ | |
1249 | int threshold_block; /* block in lsn we'd like to be at */ | |
1250 | int threshold_cycle; /* lsn cycle we'd like to be at */ | |
1251 | int free_threshold; | |
1da177e4 LT |
1252 | |
1253 | ASSERT(BTOBB(need_bytes) < log->l_logBBsize); | |
1254 | ||
c8b5ea28 | 1255 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
1256 | free_bytes = xlog_space_left(log, |
1257 | log->l_grant_reserve_cycle, | |
1258 | log->l_grant_reserve_bytes); | |
1259 | tail_lsn = log->l_tail_lsn; | |
1260 | free_blocks = BTOBBT(free_bytes); | |
1261 | ||
1262 | /* | |
1263 | * Set the threshold for the minimum number of free blocks in the | |
1264 | * log to the maximum of what the caller needs, one quarter of the | |
1265 | * log, and 256 blocks. | |
1266 | */ | |
1267 | free_threshold = BTOBB(need_bytes); | |
1268 | free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); | |
1269 | free_threshold = MAX(free_threshold, 256); | |
1270 | if (free_blocks < free_threshold) { | |
1271 | threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; | |
1272 | threshold_cycle = CYCLE_LSN(tail_lsn); | |
1273 | if (threshold_block >= log->l_logBBsize) { | |
1274 | threshold_block -= log->l_logBBsize; | |
1275 | threshold_cycle += 1; | |
1276 | } | |
03bea6fe | 1277 | threshold_lsn = xlog_assign_lsn(threshold_cycle, threshold_block); |
1da177e4 LT |
1278 | |
1279 | /* Don't pass in an lsn greater than the lsn of the last | |
1280 | * log record known to be on disk. | |
1281 | */ | |
1282 | if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) | |
1283 | threshold_lsn = log->l_last_sync_lsn; | |
1284 | } | |
c8b5ea28 | 1285 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
1286 | |
1287 | /* | |
1288 | * Get the transaction layer to kick the dirty buffers out to | |
1289 | * disk asynchronously. No point in trying to do this if | |
1290 | * the filesystem is shutting down. | |
1291 | */ | |
1292 | if (threshold_lsn && | |
1293 | !XLOG_FORCED_SHUTDOWN(log)) | |
783a2f65 | 1294 | xfs_trans_ail_push(log->l_ailp, threshold_lsn); |
1da177e4 LT |
1295 | } /* xlog_grant_push_ail */ |
1296 | ||
873ff550 CH |
1297 | /* |
1298 | * The bdstrat callback function for log bufs. This gives us a central | |
1299 | * place to trap bufs in case we get hit by a log I/O error and need to | |
1300 | * shutdown. Actually, in practice, even when we didn't get a log error, | |
1301 | * we transition the iclogs to IOERROR state *after* flushing all existing | |
1302 | * iclogs to disk. This is because we don't want anymore new transactions to be | |
1303 | * started or completed afterwards. | |
1304 | */ | |
1305 | STATIC int | |
1306 | xlog_bdstrat( | |
1307 | struct xfs_buf *bp) | |
1308 | { | |
1309 | struct xlog_in_core *iclog; | |
1310 | ||
1311 | iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); | |
1312 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
1313 | XFS_BUF_ERROR(bp, EIO); | |
1314 | XFS_BUF_STALE(bp); | |
1315 | xfs_biodone(bp); | |
1316 | /* | |
1317 | * It would seem logical to return EIO here, but we rely on | |
1318 | * the log state machine to propagate I/O errors instead of | |
1319 | * doing it here. | |
1320 | */ | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | bp->b_flags |= _XBF_RUN_QUEUES; | |
1325 | xfs_buf_iorequest(bp); | |
1326 | return 0; | |
1327 | } | |
1da177e4 LT |
1328 | |
1329 | /* | |
1330 | * Flush out the in-core log (iclog) to the on-disk log in an asynchronous | |
1331 | * fashion. Previously, we should have moved the current iclog | |
1332 | * ptr in the log to point to the next available iclog. This allows further | |
1333 | * write to continue while this code syncs out an iclog ready to go. | |
1334 | * Before an in-core log can be written out, the data section must be scanned | |
1335 | * to save away the 1st word of each BBSIZE block into the header. We replace | |
1336 | * it with the current cycle count. Each BBSIZE block is tagged with the | |
1337 | * cycle count because there in an implicit assumption that drives will | |
1338 | * guarantee that entire 512 byte blocks get written at once. In other words, | |
1339 | * we can't have part of a 512 byte block written and part not written. By | |
1340 | * tagging each block, we will know which blocks are valid when recovering | |
1341 | * after an unclean shutdown. | |
1342 | * | |
1343 | * This routine is single threaded on the iclog. No other thread can be in | |
1344 | * this routine with the same iclog. Changing contents of iclog can there- | |
1345 | * fore be done without grabbing the state machine lock. Updating the global | |
1346 | * log will require grabbing the lock though. | |
1347 | * | |
1348 | * The entire log manager uses a logical block numbering scheme. Only | |
1349 | * log_sync (and then only bwrite()) know about the fact that the log may | |
1350 | * not start with block zero on a given device. The log block start offset | |
1351 | * is added immediately before calling bwrite(). | |
1352 | */ | |
1353 | ||
a8272ce0 | 1354 | STATIC int |
1da177e4 LT |
1355 | xlog_sync(xlog_t *log, |
1356 | xlog_in_core_t *iclog) | |
1357 | { | |
1358 | xfs_caddr_t dptr; /* pointer to byte sized element */ | |
1359 | xfs_buf_t *bp; | |
b53e675d | 1360 | int i; |
1da177e4 LT |
1361 | uint count; /* byte count of bwrite */ |
1362 | uint count_init; /* initial count before roundup */ | |
1363 | int roundoff; /* roundoff to BB or stripe */ | |
1364 | int split = 0; /* split write into two regions */ | |
1365 | int error; | |
62118709 | 1366 | int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb); |
1da177e4 LT |
1367 | |
1368 | XFS_STATS_INC(xs_log_writes); | |
155cc6b7 | 1369 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
1370 | |
1371 | /* Add for LR header */ | |
1372 | count_init = log->l_iclog_hsize + iclog->ic_offset; | |
1373 | ||
1374 | /* Round out the log write size */ | |
1375 | if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { | |
1376 | /* we have a v2 stripe unit to use */ | |
1377 | count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); | |
1378 | } else { | |
1379 | count = BBTOB(BTOBB(count_init)); | |
1380 | } | |
1381 | roundoff = count - count_init; | |
1382 | ASSERT(roundoff >= 0); | |
1383 | ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && | |
1384 | roundoff < log->l_mp->m_sb.sb_logsunit) | |
1385 | || | |
1386 | (log->l_mp->m_sb.sb_logsunit <= 1 && | |
1387 | roundoff < BBTOB(1))); | |
1388 | ||
1389 | /* move grant heads by roundoff in sync */ | |
c8b5ea28 | 1390 | spin_lock(&log->l_grant_lock); |
dd954c69 | 1391 | xlog_grant_add_space(log, roundoff); |
c8b5ea28 | 1392 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
1393 | |
1394 | /* put cycle number in every block */ | |
1395 | xlog_pack_data(log, iclog, roundoff); | |
1396 | ||
1397 | /* real byte length */ | |
1398 | if (v2) { | |
b53e675d CH |
1399 | iclog->ic_header.h_len = |
1400 | cpu_to_be32(iclog->ic_offset + roundoff); | |
1da177e4 | 1401 | } else { |
b53e675d CH |
1402 | iclog->ic_header.h_len = |
1403 | cpu_to_be32(iclog->ic_offset); | |
1da177e4 LT |
1404 | } |
1405 | ||
f5faad79 | 1406 | bp = iclog->ic_bp; |
1da177e4 LT |
1407 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); |
1408 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); | |
b53e675d | 1409 | XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn))); |
1da177e4 LT |
1410 | |
1411 | XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); | |
1412 | ||
1413 | /* Do we need to split this write into 2 parts? */ | |
1414 | if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { | |
1415 | split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); | |
1416 | count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); | |
1417 | iclog->ic_bwritecnt = 2; /* split into 2 writes */ | |
1418 | } else { | |
1419 | iclog->ic_bwritecnt = 1; | |
1420 | } | |
511105b3 | 1421 | XFS_BUF_SET_COUNT(bp, count); |
1da177e4 | 1422 | XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ |
f5faad79 | 1423 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 LT |
1424 | XFS_BUF_BUSY(bp); |
1425 | XFS_BUF_ASYNC(bp); | |
2ee1abad | 1426 | bp->b_flags |= XBF_LOG_BUFFER; |
1da177e4 | 1427 | /* |
f538d4da | 1428 | * Do an ordered write for the log block. |
f5faad79 | 1429 | * Its unnecessary to flush the first split block in the log wrap case. |
1da177e4 | 1430 | */ |
f5faad79 | 1431 | if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER)) |
f538d4da | 1432 | XFS_BUF_ORDERED(bp); |
1da177e4 LT |
1433 | |
1434 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1435 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1436 | ||
1437 | xlog_verify_iclog(log, iclog, count, B_TRUE); | |
1438 | ||
1439 | /* account for log which doesn't start at block #0 */ | |
1440 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); | |
1441 | /* | |
1442 | * Don't call xfs_bwrite here. We do log-syncs even when the filesystem | |
1443 | * is shutting down. | |
1444 | */ | |
1445 | XFS_BUF_WRITE(bp); | |
1446 | ||
873ff550 | 1447 | if ((error = xlog_bdstrat(bp))) { |
1da177e4 LT |
1448 | xfs_ioerror_alert("xlog_sync", log->l_mp, bp, |
1449 | XFS_BUF_ADDR(bp)); | |
014c2544 | 1450 | return error; |
1da177e4 LT |
1451 | } |
1452 | if (split) { | |
f5faad79 | 1453 | bp = iclog->ic_log->l_xbuf; |
1da177e4 LT |
1454 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == |
1455 | (unsigned long)1); | |
1456 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); | |
1457 | XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ | |
1458 | XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ | |
1459 | (__psint_t)count), split); | |
1460 | XFS_BUF_SET_FSPRIVATE(bp, iclog); | |
f5faad79 | 1461 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 LT |
1462 | XFS_BUF_BUSY(bp); |
1463 | XFS_BUF_ASYNC(bp); | |
2ee1abad | 1464 | bp->b_flags |= XBF_LOG_BUFFER; |
f538d4da CH |
1465 | if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) |
1466 | XFS_BUF_ORDERED(bp); | |
1da177e4 LT |
1467 | dptr = XFS_BUF_PTR(bp); |
1468 | /* | |
1469 | * Bump the cycle numbers at the start of each block | |
1470 | * since this part of the buffer is at the start of | |
1471 | * a new cycle. Watch out for the header magic number | |
1472 | * case, though. | |
1473 | */ | |
b53e675d | 1474 | for (i = 0; i < split; i += BBSIZE) { |
413d57c9 | 1475 | be32_add_cpu((__be32 *)dptr, 1); |
b53e675d | 1476 | if (be32_to_cpu(*(__be32 *)dptr) == XLOG_HEADER_MAGIC_NUM) |
413d57c9 | 1477 | be32_add_cpu((__be32 *)dptr, 1); |
1da177e4 LT |
1478 | dptr += BBSIZE; |
1479 | } | |
1480 | ||
1481 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1482 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1483 | ||
c41564b5 | 1484 | /* account for internal log which doesn't start at block #0 */ |
1da177e4 LT |
1485 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); |
1486 | XFS_BUF_WRITE(bp); | |
873ff550 | 1487 | if ((error = xlog_bdstrat(bp))) { |
1da177e4 LT |
1488 | xfs_ioerror_alert("xlog_sync (split)", log->l_mp, |
1489 | bp, XFS_BUF_ADDR(bp)); | |
014c2544 | 1490 | return error; |
1da177e4 LT |
1491 | } |
1492 | } | |
014c2544 | 1493 | return 0; |
1da177e4 LT |
1494 | } /* xlog_sync */ |
1495 | ||
1496 | ||
1497 | /* | |
c41564b5 | 1498 | * Deallocate a log structure |
1da177e4 | 1499 | */ |
a8272ce0 | 1500 | STATIC void |
c41564b5 | 1501 | xlog_dealloc_log(xlog_t *log) |
1da177e4 LT |
1502 | { |
1503 | xlog_in_core_t *iclog, *next_iclog; | |
1da177e4 LT |
1504 | int i; |
1505 | ||
71e330b5 DC |
1506 | xlog_cil_destroy(log); |
1507 | ||
1da177e4 LT |
1508 | iclog = log->l_iclog; |
1509 | for (i=0; i<log->l_iclog_bufs; i++) { | |
12017faf DC |
1510 | sv_destroy(&iclog->ic_force_wait); |
1511 | sv_destroy(&iclog->ic_write_wait); | |
1da177e4 | 1512 | xfs_buf_free(iclog->ic_bp); |
1da177e4 | 1513 | next_iclog = iclog->ic_next; |
f0e2d93c | 1514 | kmem_free(iclog); |
1da177e4 LT |
1515 | iclog = next_iclog; |
1516 | } | |
1da177e4 LT |
1517 | spinlock_destroy(&log->l_icloglock); |
1518 | spinlock_destroy(&log->l_grant_lock); | |
1519 | ||
1da177e4 | 1520 | xfs_buf_free(log->l_xbuf); |
1da177e4 | 1521 | log->l_mp->m_log = NULL; |
f0e2d93c | 1522 | kmem_free(log); |
c41564b5 | 1523 | } /* xlog_dealloc_log */ |
1da177e4 LT |
1524 | |
1525 | /* | |
1526 | * Update counters atomically now that memcpy is done. | |
1527 | */ | |
1528 | /* ARGSUSED */ | |
1529 | static inline void | |
1530 | xlog_state_finish_copy(xlog_t *log, | |
1531 | xlog_in_core_t *iclog, | |
1532 | int record_cnt, | |
1533 | int copy_bytes) | |
1534 | { | |
b22cd72c | 1535 | spin_lock(&log->l_icloglock); |
1da177e4 | 1536 | |
413d57c9 | 1537 | be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); |
1da177e4 LT |
1538 | iclog->ic_offset += copy_bytes; |
1539 | ||
b22cd72c | 1540 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
1541 | } /* xlog_state_finish_copy */ |
1542 | ||
1543 | ||
1544 | ||
1545 | ||
7e9c6396 TS |
1546 | /* |
1547 | * print out info relating to regions written which consume | |
1548 | * the reservation | |
1549 | */ | |
71e330b5 DC |
1550 | void |
1551 | xlog_print_tic_res( | |
1552 | struct xfs_mount *mp, | |
1553 | struct xlog_ticket *ticket) | |
7e9c6396 TS |
1554 | { |
1555 | uint i; | |
1556 | uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); | |
1557 | ||
1558 | /* match with XLOG_REG_TYPE_* in xfs_log.h */ | |
1559 | static char *res_type_str[XLOG_REG_TYPE_MAX] = { | |
1560 | "bformat", | |
1561 | "bchunk", | |
1562 | "efi_format", | |
1563 | "efd_format", | |
1564 | "iformat", | |
1565 | "icore", | |
1566 | "iext", | |
1567 | "ibroot", | |
1568 | "ilocal", | |
1569 | "iattr_ext", | |
1570 | "iattr_broot", | |
1571 | "iattr_local", | |
1572 | "qformat", | |
1573 | "dquot", | |
1574 | "quotaoff", | |
1575 | "LR header", | |
1576 | "unmount", | |
1577 | "commit", | |
1578 | "trans header" | |
1579 | }; | |
1580 | static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { | |
1581 | "SETATTR_NOT_SIZE", | |
1582 | "SETATTR_SIZE", | |
1583 | "INACTIVE", | |
1584 | "CREATE", | |
1585 | "CREATE_TRUNC", | |
1586 | "TRUNCATE_FILE", | |
1587 | "REMOVE", | |
1588 | "LINK", | |
1589 | "RENAME", | |
1590 | "MKDIR", | |
1591 | "RMDIR", | |
1592 | "SYMLINK", | |
1593 | "SET_DMATTRS", | |
1594 | "GROWFS", | |
1595 | "STRAT_WRITE", | |
1596 | "DIOSTRAT", | |
1597 | "WRITE_SYNC", | |
1598 | "WRITEID", | |
1599 | "ADDAFORK", | |
1600 | "ATTRINVAL", | |
1601 | "ATRUNCATE", | |
1602 | "ATTR_SET", | |
1603 | "ATTR_RM", | |
1604 | "ATTR_FLAG", | |
1605 | "CLEAR_AGI_BUCKET", | |
1606 | "QM_SBCHANGE", | |
1607 | "DUMMY1", | |
1608 | "DUMMY2", | |
1609 | "QM_QUOTAOFF", | |
1610 | "QM_DQALLOC", | |
1611 | "QM_SETQLIM", | |
1612 | "QM_DQCLUSTER", | |
1613 | "QM_QINOCREATE", | |
1614 | "QM_QUOTAOFF_END", | |
1615 | "SB_UNIT", | |
1616 | "FSYNC_TS", | |
1617 | "GROWFSRT_ALLOC", | |
1618 | "GROWFSRT_ZERO", | |
1619 | "GROWFSRT_FREE", | |
1620 | "SWAPEXT" | |
1621 | }; | |
1622 | ||
1623 | xfs_fs_cmn_err(CE_WARN, mp, | |
1624 | "xfs_log_write: reservation summary:\n" | |
1625 | " trans type = %s (%u)\n" | |
1626 | " unit res = %d bytes\n" | |
1627 | " current res = %d bytes\n" | |
1628 | " total reg = %u bytes (o/flow = %u bytes)\n" | |
1629 | " ophdrs = %u (ophdr space = %u bytes)\n" | |
1630 | " ophdr + reg = %u bytes\n" | |
1631 | " num regions = %u\n", | |
1632 | ((ticket->t_trans_type <= 0 || | |
1633 | ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? | |
1634 | "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), | |
1635 | ticket->t_trans_type, | |
1636 | ticket->t_unit_res, | |
1637 | ticket->t_curr_res, | |
1638 | ticket->t_res_arr_sum, ticket->t_res_o_flow, | |
1639 | ticket->t_res_num_ophdrs, ophdr_spc, | |
1640 | ticket->t_res_arr_sum + | |
1259845d | 1641 | ticket->t_res_o_flow + ophdr_spc, |
7e9c6396 TS |
1642 | ticket->t_res_num); |
1643 | ||
1644 | for (i = 0; i < ticket->t_res_num; i++) { | |
1259845d | 1645 | uint r_type = ticket->t_res_arr[i].r_type; |
7e9c6396 TS |
1646 | cmn_err(CE_WARN, |
1647 | "region[%u]: %s - %u bytes\n", | |
1648 | i, | |
1649 | ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? | |
1650 | "bad-rtype" : res_type_str[r_type-1]), | |
1651 | ticket->t_res_arr[i].r_len); | |
1652 | } | |
169a7b07 DC |
1653 | |
1654 | xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, | |
1655 | "xfs_log_write: reservation ran out. Need to up reservation"); | |
1656 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); | |
7e9c6396 | 1657 | } |
7e9c6396 | 1658 | |
b5203cd0 DC |
1659 | /* |
1660 | * Calculate the potential space needed by the log vector. Each region gets | |
1661 | * its own xlog_op_header_t and may need to be double word aligned. | |
1662 | */ | |
1663 | static int | |
1664 | xlog_write_calc_vec_length( | |
1665 | struct xlog_ticket *ticket, | |
55b66332 | 1666 | struct xfs_log_vec *log_vector) |
b5203cd0 | 1667 | { |
55b66332 | 1668 | struct xfs_log_vec *lv; |
b5203cd0 DC |
1669 | int headers = 0; |
1670 | int len = 0; | |
1671 | int i; | |
1672 | ||
1673 | /* acct for start rec of xact */ | |
1674 | if (ticket->t_flags & XLOG_TIC_INITED) | |
1675 | headers++; | |
1676 | ||
55b66332 DC |
1677 | for (lv = log_vector; lv; lv = lv->lv_next) { |
1678 | headers += lv->lv_niovecs; | |
1679 | ||
1680 | for (i = 0; i < lv->lv_niovecs; i++) { | |
1681 | struct xfs_log_iovec *vecp = &lv->lv_iovecp[i]; | |
b5203cd0 | 1682 | |
55b66332 DC |
1683 | len += vecp->i_len; |
1684 | xlog_tic_add_region(ticket, vecp->i_len, vecp->i_type); | |
1685 | } | |
b5203cd0 DC |
1686 | } |
1687 | ||
1688 | ticket->t_res_num_ophdrs += headers; | |
1689 | len += headers * sizeof(struct xlog_op_header); | |
1690 | ||
1691 | return len; | |
1692 | } | |
1693 | ||
1694 | /* | |
1695 | * If first write for transaction, insert start record We can't be trying to | |
1696 | * commit if we are inited. We can't have any "partial_copy" if we are inited. | |
1697 | */ | |
1698 | static int | |
1699 | xlog_write_start_rec( | |
e6b1f273 | 1700 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
1701 | struct xlog_ticket *ticket) |
1702 | { | |
b5203cd0 DC |
1703 | if (!(ticket->t_flags & XLOG_TIC_INITED)) |
1704 | return 0; | |
1705 | ||
1706 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); | |
1707 | ophdr->oh_clientid = ticket->t_clientid; | |
1708 | ophdr->oh_len = 0; | |
1709 | ophdr->oh_flags = XLOG_START_TRANS; | |
1710 | ophdr->oh_res2 = 0; | |
1711 | ||
1712 | ticket->t_flags &= ~XLOG_TIC_INITED; | |
1713 | ||
1714 | return sizeof(struct xlog_op_header); | |
1715 | } | |
1716 | ||
1717 | static xlog_op_header_t * | |
1718 | xlog_write_setup_ophdr( | |
1719 | struct log *log, | |
e6b1f273 | 1720 | struct xlog_op_header *ophdr, |
b5203cd0 DC |
1721 | struct xlog_ticket *ticket, |
1722 | uint flags) | |
1723 | { | |
b5203cd0 DC |
1724 | ophdr->oh_tid = cpu_to_be32(ticket->t_tid); |
1725 | ophdr->oh_clientid = ticket->t_clientid; | |
1726 | ophdr->oh_res2 = 0; | |
1727 | ||
1728 | /* are we copying a commit or unmount record? */ | |
1729 | ophdr->oh_flags = flags; | |
1730 | ||
1731 | /* | |
1732 | * We've seen logs corrupted with bad transaction client ids. This | |
1733 | * makes sure that XFS doesn't generate them on. Turn this into an EIO | |
1734 | * and shut down the filesystem. | |
1735 | */ | |
1736 | switch (ophdr->oh_clientid) { | |
1737 | case XFS_TRANSACTION: | |
1738 | case XFS_VOLUME: | |
1739 | case XFS_LOG: | |
1740 | break; | |
1741 | default: | |
1742 | xfs_fs_cmn_err(CE_WARN, log->l_mp, | |
1743 | "Bad XFS transaction clientid 0x%x in ticket 0x%p", | |
1744 | ophdr->oh_clientid, ticket); | |
1745 | return NULL; | |
1746 | } | |
1747 | ||
1748 | return ophdr; | |
1749 | } | |
1750 | ||
1751 | /* | |
1752 | * Set up the parameters of the region copy into the log. This has | |
1753 | * to handle region write split across multiple log buffers - this | |
1754 | * state is kept external to this function so that this code can | |
1755 | * can be written in an obvious, self documenting manner. | |
1756 | */ | |
1757 | static int | |
1758 | xlog_write_setup_copy( | |
1759 | struct xlog_ticket *ticket, | |
1760 | struct xlog_op_header *ophdr, | |
1761 | int space_available, | |
1762 | int space_required, | |
1763 | int *copy_off, | |
1764 | int *copy_len, | |
1765 | int *last_was_partial_copy, | |
1766 | int *bytes_consumed) | |
1767 | { | |
1768 | int still_to_copy; | |
1769 | ||
1770 | still_to_copy = space_required - *bytes_consumed; | |
1771 | *copy_off = *bytes_consumed; | |
1772 | ||
1773 | if (still_to_copy <= space_available) { | |
1774 | /* write of region completes here */ | |
1775 | *copy_len = still_to_copy; | |
1776 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
1777 | if (*last_was_partial_copy) | |
1778 | ophdr->oh_flags |= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); | |
1779 | *last_was_partial_copy = 0; | |
1780 | *bytes_consumed = 0; | |
1781 | return 0; | |
1782 | } | |
1783 | ||
1784 | /* partial write of region, needs extra log op header reservation */ | |
1785 | *copy_len = space_available; | |
1786 | ophdr->oh_len = cpu_to_be32(*copy_len); | |
1787 | ophdr->oh_flags |= XLOG_CONTINUE_TRANS; | |
1788 | if (*last_was_partial_copy) | |
1789 | ophdr->oh_flags |= XLOG_WAS_CONT_TRANS; | |
1790 | *bytes_consumed += *copy_len; | |
1791 | (*last_was_partial_copy)++; | |
1792 | ||
1793 | /* account for new log op header */ | |
1794 | ticket->t_curr_res -= sizeof(struct xlog_op_header); | |
1795 | ticket->t_res_num_ophdrs++; | |
1796 | ||
1797 | return sizeof(struct xlog_op_header); | |
1798 | } | |
1799 | ||
1800 | static int | |
1801 | xlog_write_copy_finish( | |
1802 | struct log *log, | |
1803 | struct xlog_in_core *iclog, | |
1804 | uint flags, | |
1805 | int *record_cnt, | |
1806 | int *data_cnt, | |
1807 | int *partial_copy, | |
1808 | int *partial_copy_len, | |
1809 | int log_offset, | |
1810 | struct xlog_in_core **commit_iclog) | |
1811 | { | |
1812 | if (*partial_copy) { | |
1813 | /* | |
1814 | * This iclog has already been marked WANT_SYNC by | |
1815 | * xlog_state_get_iclog_space. | |
1816 | */ | |
1817 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); | |
1818 | *record_cnt = 0; | |
1819 | *data_cnt = 0; | |
1820 | return xlog_state_release_iclog(log, iclog); | |
1821 | } | |
1822 | ||
1823 | *partial_copy = 0; | |
1824 | *partial_copy_len = 0; | |
1825 | ||
1826 | if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { | |
1827 | /* no more space in this iclog - push it. */ | |
1828 | xlog_state_finish_copy(log, iclog, *record_cnt, *data_cnt); | |
1829 | *record_cnt = 0; | |
1830 | *data_cnt = 0; | |
1831 | ||
1832 | spin_lock(&log->l_icloglock); | |
1833 | xlog_state_want_sync(log, iclog); | |
1834 | spin_unlock(&log->l_icloglock); | |
1835 | ||
1836 | if (!commit_iclog) | |
1837 | return xlog_state_release_iclog(log, iclog); | |
1838 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
1839 | *commit_iclog = iclog; | |
1840 | } | |
1841 | ||
1842 | return 0; | |
1843 | } | |
1844 | ||
1da177e4 LT |
1845 | /* |
1846 | * Write some region out to in-core log | |
1847 | * | |
1848 | * This will be called when writing externally provided regions or when | |
1849 | * writing out a commit record for a given transaction. | |
1850 | * | |
1851 | * General algorithm: | |
1852 | * 1. Find total length of this write. This may include adding to the | |
1853 | * lengths passed in. | |
1854 | * 2. Check whether we violate the tickets reservation. | |
1855 | * 3. While writing to this iclog | |
1856 | * A. Reserve as much space in this iclog as can get | |
1857 | * B. If this is first write, save away start lsn | |
1858 | * C. While writing this region: | |
1859 | * 1. If first write of transaction, write start record | |
1860 | * 2. Write log operation header (header per region) | |
1861 | * 3. Find out if we can fit entire region into this iclog | |
1862 | * 4. Potentially, verify destination memcpy ptr | |
1863 | * 5. Memcpy (partial) region | |
1864 | * 6. If partial copy, release iclog; otherwise, continue | |
1865 | * copying more regions into current iclog | |
1866 | * 4. Mark want sync bit (in simulation mode) | |
1867 | * 5. Release iclog for potential flush to on-disk log. | |
1868 | * | |
1869 | * ERRORS: | |
1870 | * 1. Panic if reservation is overrun. This should never happen since | |
1871 | * reservation amounts are generated internal to the filesystem. | |
1872 | * NOTES: | |
1873 | * 1. Tickets are single threaded data structures. | |
1874 | * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the | |
1875 | * syncing routine. When a single log_write region needs to span | |
1876 | * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set | |
1877 | * on all log operation writes which don't contain the end of the | |
1878 | * region. The XLOG_END_TRANS bit is used for the in-core log | |
1879 | * operation which contains the end of the continued log_write region. | |
1880 | * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, | |
1881 | * we don't really know exactly how much space will be used. As a result, | |
1882 | * we don't update ic_offset until the end when we know exactly how many | |
1883 | * bytes have been written out. | |
1884 | */ | |
71e330b5 | 1885 | int |
35a8a72f | 1886 | xlog_write( |
55b66332 DC |
1887 | struct log *log, |
1888 | struct xfs_log_vec *log_vector, | |
35a8a72f CH |
1889 | struct xlog_ticket *ticket, |
1890 | xfs_lsn_t *start_lsn, | |
1891 | struct xlog_in_core **commit_iclog, | |
1892 | uint flags) | |
1da177e4 | 1893 | { |
99428ad0 | 1894 | struct xlog_in_core *iclog = NULL; |
55b66332 DC |
1895 | struct xfs_log_iovec *vecp; |
1896 | struct xfs_log_vec *lv; | |
99428ad0 CH |
1897 | int len; |
1898 | int index; | |
1899 | int partial_copy = 0; | |
1900 | int partial_copy_len = 0; | |
1901 | int contwr = 0; | |
1902 | int record_cnt = 0; | |
1903 | int data_cnt = 0; | |
1904 | int error; | |
1905 | ||
1906 | *start_lsn = 0; | |
1907 | ||
55b66332 | 1908 | len = xlog_write_calc_vec_length(ticket, log_vector); |
71e330b5 DC |
1909 | if (log->l_cilp) { |
1910 | /* | |
1911 | * Region headers and bytes are already accounted for. | |
1912 | * We only need to take into account start records and | |
1913 | * split regions in this function. | |
1914 | */ | |
1915 | if (ticket->t_flags & XLOG_TIC_INITED) | |
1916 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
1917 | ||
1918 | /* | |
1919 | * Commit record headers need to be accounted for. These | |
1920 | * come in as separate writes so are easy to detect. | |
1921 | */ | |
1922 | if (flags & (XLOG_COMMIT_TRANS | XLOG_UNMOUNT_TRANS)) | |
1923 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
1924 | } else | |
1925 | ticket->t_curr_res -= len; | |
1926 | ||
1927 | if (ticket->t_curr_res < 0) | |
55b66332 | 1928 | xlog_print_tic_res(log->l_mp, ticket); |
1da177e4 | 1929 | |
55b66332 DC |
1930 | index = 0; |
1931 | lv = log_vector; | |
1932 | vecp = lv->lv_iovecp; | |
1933 | while (lv && index < lv->lv_niovecs) { | |
e6b1f273 | 1934 | void *ptr; |
99428ad0 | 1935 | int log_offset; |
1da177e4 | 1936 | |
99428ad0 CH |
1937 | error = xlog_state_get_iclog_space(log, len, &iclog, ticket, |
1938 | &contwr, &log_offset); | |
1939 | if (error) | |
1940 | return error; | |
1da177e4 | 1941 | |
99428ad0 | 1942 | ASSERT(log_offset <= iclog->ic_size - 1); |
e6b1f273 | 1943 | ptr = iclog->ic_datap + log_offset; |
1da177e4 | 1944 | |
99428ad0 CH |
1945 | /* start_lsn is the first lsn written to. That's all we need. */ |
1946 | if (!*start_lsn) | |
1947 | *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
b5203cd0 | 1948 | |
99428ad0 CH |
1949 | /* |
1950 | * This loop writes out as many regions as can fit in the amount | |
1951 | * of space which was allocated by xlog_state_get_iclog_space(). | |
1952 | */ | |
55b66332 DC |
1953 | while (lv && index < lv->lv_niovecs) { |
1954 | struct xfs_log_iovec *reg = &vecp[index]; | |
99428ad0 CH |
1955 | struct xlog_op_header *ophdr; |
1956 | int start_rec_copy; | |
1957 | int copy_len; | |
1958 | int copy_off; | |
1959 | ||
55b66332 | 1960 | ASSERT(reg->i_len % sizeof(__int32_t) == 0); |
e6b1f273 | 1961 | ASSERT((unsigned long)ptr % sizeof(__int32_t) == 0); |
99428ad0 CH |
1962 | |
1963 | start_rec_copy = xlog_write_start_rec(ptr, ticket); | |
1964 | if (start_rec_copy) { | |
1965 | record_cnt++; | |
e6b1f273 | 1966 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
1967 | start_rec_copy); |
1968 | } | |
b5203cd0 | 1969 | |
99428ad0 CH |
1970 | ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags); |
1971 | if (!ophdr) | |
1972 | return XFS_ERROR(EIO); | |
1973 | ||
e6b1f273 | 1974 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
1975 | sizeof(struct xlog_op_header)); |
1976 | ||
1977 | len += xlog_write_setup_copy(ticket, ophdr, | |
1978 | iclog->ic_size-log_offset, | |
55b66332 | 1979 | reg->i_len, |
99428ad0 CH |
1980 | ©_off, ©_len, |
1981 | &partial_copy, | |
1982 | &partial_copy_len); | |
1983 | xlog_verify_dest_ptr(log, ptr); | |
1984 | ||
1985 | /* copy region */ | |
1986 | ASSERT(copy_len >= 0); | |
e6b1f273 CH |
1987 | memcpy(ptr, reg->i_addr + copy_off, copy_len); |
1988 | xlog_write_adv_cnt(&ptr, &len, &log_offset, copy_len); | |
99428ad0 CH |
1989 | |
1990 | copy_len += start_rec_copy + sizeof(xlog_op_header_t); | |
1991 | record_cnt++; | |
1992 | data_cnt += contwr ? copy_len : 0; | |
1993 | ||
1994 | error = xlog_write_copy_finish(log, iclog, flags, | |
1995 | &record_cnt, &data_cnt, | |
1996 | &partial_copy, | |
1997 | &partial_copy_len, | |
1998 | log_offset, | |
1999 | commit_iclog); | |
2000 | if (error) | |
2001 | return error; | |
2002 | ||
2003 | /* | |
2004 | * if we had a partial copy, we need to get more iclog | |
2005 | * space but we don't want to increment the region | |
2006 | * index because there is still more is this region to | |
2007 | * write. | |
2008 | * | |
2009 | * If we completed writing this region, and we flushed | |
2010 | * the iclog (indicated by resetting of the record | |
2011 | * count), then we also need to get more log space. If | |
2012 | * this was the last record, though, we are done and | |
2013 | * can just return. | |
2014 | */ | |
2015 | if (partial_copy) | |
2016 | break; | |
2017 | ||
55b66332 DC |
2018 | if (++index == lv->lv_niovecs) { |
2019 | lv = lv->lv_next; | |
2020 | index = 0; | |
2021 | if (lv) | |
2022 | vecp = lv->lv_iovecp; | |
2023 | } | |
99428ad0 | 2024 | if (record_cnt == 0) { |
55b66332 | 2025 | if (!lv) |
99428ad0 CH |
2026 | return 0; |
2027 | break; | |
2028 | } | |
2029 | } | |
2030 | } | |
2031 | ||
2032 | ASSERT(len == 0); | |
2033 | ||
2034 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
2035 | if (!commit_iclog) | |
2036 | return xlog_state_release_iclog(log, iclog); | |
1da177e4 | 2037 | |
1da177e4 LT |
2038 | ASSERT(flags & XLOG_COMMIT_TRANS); |
2039 | *commit_iclog = iclog; | |
2040 | return 0; | |
99428ad0 | 2041 | } |
1da177e4 LT |
2042 | |
2043 | ||
2044 | /***************************************************************************** | |
2045 | * | |
2046 | * State Machine functions | |
2047 | * | |
2048 | ***************************************************************************** | |
2049 | */ | |
2050 | ||
2051 | /* Clean iclogs starting from the head. This ordering must be | |
2052 | * maintained, so an iclog doesn't become ACTIVE beyond one that | |
2053 | * is SYNCING. This is also required to maintain the notion that we use | |
12017faf | 2054 | * a ordered wait queue to hold off would be writers to the log when every |
1da177e4 LT |
2055 | * iclog is trying to sync to disk. |
2056 | * | |
2057 | * State Change: DIRTY -> ACTIVE | |
2058 | */ | |
ba0f32d4 | 2059 | STATIC void |
1da177e4 LT |
2060 | xlog_state_clean_log(xlog_t *log) |
2061 | { | |
2062 | xlog_in_core_t *iclog; | |
2063 | int changed = 0; | |
2064 | ||
2065 | iclog = log->l_iclog; | |
2066 | do { | |
2067 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
2068 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
2069 | iclog->ic_offset = 0; | |
114d23aa | 2070 | ASSERT(iclog->ic_callback == NULL); |
1da177e4 LT |
2071 | /* |
2072 | * If the number of ops in this iclog indicate it just | |
2073 | * contains the dummy transaction, we can | |
2074 | * change state into IDLE (the second time around). | |
2075 | * Otherwise we should change the state into | |
2076 | * NEED a dummy. | |
2077 | * We don't need to cover the dummy. | |
2078 | */ | |
2079 | if (!changed && | |
b53e675d CH |
2080 | (be32_to_cpu(iclog->ic_header.h_num_logops) == |
2081 | XLOG_COVER_OPS)) { | |
1da177e4 LT |
2082 | changed = 1; |
2083 | } else { | |
2084 | /* | |
2085 | * We have two dirty iclogs so start over | |
2086 | * This could also be num of ops indicates | |
2087 | * this is not the dummy going out. | |
2088 | */ | |
2089 | changed = 2; | |
2090 | } | |
2091 | iclog->ic_header.h_num_logops = 0; | |
2092 | memset(iclog->ic_header.h_cycle_data, 0, | |
2093 | sizeof(iclog->ic_header.h_cycle_data)); | |
2094 | iclog->ic_header.h_lsn = 0; | |
2095 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) | |
2096 | /* do nothing */; | |
2097 | else | |
2098 | break; /* stop cleaning */ | |
2099 | iclog = iclog->ic_next; | |
2100 | } while (iclog != log->l_iclog); | |
2101 | ||
2102 | /* log is locked when we are called */ | |
2103 | /* | |
2104 | * Change state for the dummy log recording. | |
2105 | * We usually go to NEED. But we go to NEED2 if the changed indicates | |
2106 | * we are done writing the dummy record. | |
2107 | * If we are done with the second dummy recored (DONE2), then | |
2108 | * we go to IDLE. | |
2109 | */ | |
2110 | if (changed) { | |
2111 | switch (log->l_covered_state) { | |
2112 | case XLOG_STATE_COVER_IDLE: | |
2113 | case XLOG_STATE_COVER_NEED: | |
2114 | case XLOG_STATE_COVER_NEED2: | |
2115 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2116 | break; | |
2117 | ||
2118 | case XLOG_STATE_COVER_DONE: | |
2119 | if (changed == 1) | |
2120 | log->l_covered_state = XLOG_STATE_COVER_NEED2; | |
2121 | else | |
2122 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2123 | break; | |
2124 | ||
2125 | case XLOG_STATE_COVER_DONE2: | |
2126 | if (changed == 1) | |
2127 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
2128 | else | |
2129 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2130 | break; | |
2131 | ||
2132 | default: | |
2133 | ASSERT(0); | |
2134 | } | |
2135 | } | |
2136 | } /* xlog_state_clean_log */ | |
2137 | ||
2138 | STATIC xfs_lsn_t | |
2139 | xlog_get_lowest_lsn( | |
2140 | xlog_t *log) | |
2141 | { | |
2142 | xlog_in_core_t *lsn_log; | |
2143 | xfs_lsn_t lowest_lsn, lsn; | |
2144 | ||
2145 | lsn_log = log->l_iclog; | |
2146 | lowest_lsn = 0; | |
2147 | do { | |
2148 | if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { | |
b53e675d | 2149 | lsn = be64_to_cpu(lsn_log->ic_header.h_lsn); |
1da177e4 LT |
2150 | if ((lsn && !lowest_lsn) || |
2151 | (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { | |
2152 | lowest_lsn = lsn; | |
2153 | } | |
2154 | } | |
2155 | lsn_log = lsn_log->ic_next; | |
2156 | } while (lsn_log != log->l_iclog); | |
014c2544 | 2157 | return lowest_lsn; |
1da177e4 LT |
2158 | } |
2159 | ||
2160 | ||
2161 | STATIC void | |
2162 | xlog_state_do_callback( | |
2163 | xlog_t *log, | |
2164 | int aborted, | |
2165 | xlog_in_core_t *ciclog) | |
2166 | { | |
2167 | xlog_in_core_t *iclog; | |
2168 | xlog_in_core_t *first_iclog; /* used to know when we've | |
2169 | * processed all iclogs once */ | |
2170 | xfs_log_callback_t *cb, *cb_next; | |
2171 | int flushcnt = 0; | |
2172 | xfs_lsn_t lowest_lsn; | |
2173 | int ioerrors; /* counter: iclogs with errors */ | |
2174 | int loopdidcallbacks; /* flag: inner loop did callbacks*/ | |
2175 | int funcdidcallbacks; /* flag: function did callbacks */ | |
2176 | int repeats; /* for issuing console warnings if | |
2177 | * looping too many times */ | |
d748c623 | 2178 | int wake = 0; |
1da177e4 | 2179 | |
b22cd72c | 2180 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2181 | first_iclog = iclog = log->l_iclog; |
2182 | ioerrors = 0; | |
2183 | funcdidcallbacks = 0; | |
2184 | repeats = 0; | |
2185 | ||
2186 | do { | |
2187 | /* | |
2188 | * Scan all iclogs starting with the one pointed to by the | |
2189 | * log. Reset this starting point each time the log is | |
2190 | * unlocked (during callbacks). | |
2191 | * | |
2192 | * Keep looping through iclogs until one full pass is made | |
2193 | * without running any callbacks. | |
2194 | */ | |
2195 | first_iclog = log->l_iclog; | |
2196 | iclog = log->l_iclog; | |
2197 | loopdidcallbacks = 0; | |
2198 | repeats++; | |
2199 | ||
2200 | do { | |
2201 | ||
2202 | /* skip all iclogs in the ACTIVE & DIRTY states */ | |
2203 | if (iclog->ic_state & | |
2204 | (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { | |
2205 | iclog = iclog->ic_next; | |
2206 | continue; | |
2207 | } | |
2208 | ||
2209 | /* | |
2210 | * Between marking a filesystem SHUTDOWN and stopping | |
2211 | * the log, we do flush all iclogs to disk (if there | |
2212 | * wasn't a log I/O error). So, we do want things to | |
2213 | * go smoothly in case of just a SHUTDOWN w/o a | |
2214 | * LOG_IO_ERROR. | |
2215 | */ | |
2216 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
2217 | /* | |
2218 | * Can only perform callbacks in order. Since | |
2219 | * this iclog is not in the DONE_SYNC/ | |
2220 | * DO_CALLBACK state, we skip the rest and | |
2221 | * just try to clean up. If we set our iclog | |
2222 | * to DO_CALLBACK, we will not process it when | |
2223 | * we retry since a previous iclog is in the | |
2224 | * CALLBACK and the state cannot change since | |
b22cd72c | 2225 | * we are holding the l_icloglock. |
1da177e4 LT |
2226 | */ |
2227 | if (!(iclog->ic_state & | |
2228 | (XLOG_STATE_DONE_SYNC | | |
2229 | XLOG_STATE_DO_CALLBACK))) { | |
2230 | if (ciclog && (ciclog->ic_state == | |
2231 | XLOG_STATE_DONE_SYNC)) { | |
2232 | ciclog->ic_state = XLOG_STATE_DO_CALLBACK; | |
2233 | } | |
2234 | break; | |
2235 | } | |
2236 | /* | |
2237 | * We now have an iclog that is in either the | |
2238 | * DO_CALLBACK or DONE_SYNC states. The other | |
2239 | * states (WANT_SYNC, SYNCING, or CALLBACK were | |
2240 | * caught by the above if and are going to | |
2241 | * clean (i.e. we aren't doing their callbacks) | |
2242 | * see the above if. | |
2243 | */ | |
2244 | ||
2245 | /* | |
2246 | * We will do one more check here to see if we | |
2247 | * have chased our tail around. | |
2248 | */ | |
2249 | ||
2250 | lowest_lsn = xlog_get_lowest_lsn(log); | |
b53e675d CH |
2251 | if (lowest_lsn && |
2252 | XFS_LSN_CMP(lowest_lsn, | |
2253 | be64_to_cpu(iclog->ic_header.h_lsn)) < 0) { | |
1da177e4 LT |
2254 | iclog = iclog->ic_next; |
2255 | continue; /* Leave this iclog for | |
2256 | * another thread */ | |
2257 | } | |
2258 | ||
2259 | iclog->ic_state = XLOG_STATE_CALLBACK; | |
2260 | ||
b22cd72c | 2261 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2262 | |
2263 | /* l_last_sync_lsn field protected by | |
c8b5ea28 | 2264 | * l_grant_lock. Don't worry about iclog's lsn. |
1da177e4 LT |
2265 | * No one else can be here except us. |
2266 | */ | |
c8b5ea28 | 2267 | spin_lock(&log->l_grant_lock); |
b53e675d CH |
2268 | ASSERT(XFS_LSN_CMP(log->l_last_sync_lsn, |
2269 | be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); | |
2270 | log->l_last_sync_lsn = | |
2271 | be64_to_cpu(iclog->ic_header.h_lsn); | |
c8b5ea28 | 2272 | spin_unlock(&log->l_grant_lock); |
1da177e4 | 2273 | |
1da177e4 | 2274 | } else { |
114d23aa | 2275 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2276 | ioerrors++; |
2277 | } | |
1da177e4 | 2278 | |
114d23aa DC |
2279 | /* |
2280 | * Keep processing entries in the callback list until | |
2281 | * we come around and it is empty. We need to | |
2282 | * atomically see that the list is empty and change the | |
2283 | * state to DIRTY so that we don't miss any more | |
2284 | * callbacks being added. | |
2285 | */ | |
2286 | spin_lock(&iclog->ic_callback_lock); | |
2287 | cb = iclog->ic_callback; | |
4b80916b | 2288 | while (cb) { |
1da177e4 LT |
2289 | iclog->ic_callback_tail = &(iclog->ic_callback); |
2290 | iclog->ic_callback = NULL; | |
114d23aa | 2291 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2292 | |
2293 | /* perform callbacks in the order given */ | |
4b80916b | 2294 | for (; cb; cb = cb_next) { |
1da177e4 LT |
2295 | cb_next = cb->cb_next; |
2296 | cb->cb_func(cb->cb_arg, aborted); | |
2297 | } | |
114d23aa | 2298 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
2299 | cb = iclog->ic_callback; |
2300 | } | |
2301 | ||
2302 | loopdidcallbacks++; | |
2303 | funcdidcallbacks++; | |
2304 | ||
114d23aa | 2305 | spin_lock(&log->l_icloglock); |
4b80916b | 2306 | ASSERT(iclog->ic_callback == NULL); |
114d23aa | 2307 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2308 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) |
2309 | iclog->ic_state = XLOG_STATE_DIRTY; | |
2310 | ||
2311 | /* | |
2312 | * Transition from DIRTY to ACTIVE if applicable. | |
2313 | * NOP if STATE_IOERROR. | |
2314 | */ | |
2315 | xlog_state_clean_log(log); | |
2316 | ||
2317 | /* wake up threads waiting in xfs_log_force() */ | |
12017faf | 2318 | sv_broadcast(&iclog->ic_force_wait); |
1da177e4 LT |
2319 | |
2320 | iclog = iclog->ic_next; | |
2321 | } while (first_iclog != iclog); | |
a3c6685e NS |
2322 | |
2323 | if (repeats > 5000) { | |
2324 | flushcnt += repeats; | |
2325 | repeats = 0; | |
1da177e4 | 2326 | xfs_fs_cmn_err(CE_WARN, log->l_mp, |
a3c6685e | 2327 | "%s: possible infinite loop (%d iterations)", |
34a622b2 | 2328 | __func__, flushcnt); |
1da177e4 LT |
2329 | } |
2330 | } while (!ioerrors && loopdidcallbacks); | |
2331 | ||
2332 | /* | |
2333 | * make one last gasp attempt to see if iclogs are being left in | |
2334 | * limbo.. | |
2335 | */ | |
2336 | #ifdef DEBUG | |
2337 | if (funcdidcallbacks) { | |
2338 | first_iclog = iclog = log->l_iclog; | |
2339 | do { | |
2340 | ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); | |
2341 | /* | |
2342 | * Terminate the loop if iclogs are found in states | |
2343 | * which will cause other threads to clean up iclogs. | |
2344 | * | |
2345 | * SYNCING - i/o completion will go through logs | |
2346 | * DONE_SYNC - interrupt thread should be waiting for | |
b22cd72c | 2347 | * l_icloglock |
1da177e4 LT |
2348 | * IOERROR - give up hope all ye who enter here |
2349 | */ | |
2350 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC || | |
2351 | iclog->ic_state == XLOG_STATE_SYNCING || | |
2352 | iclog->ic_state == XLOG_STATE_DONE_SYNC || | |
2353 | iclog->ic_state == XLOG_STATE_IOERROR ) | |
2354 | break; | |
2355 | iclog = iclog->ic_next; | |
2356 | } while (first_iclog != iclog); | |
2357 | } | |
2358 | #endif | |
2359 | ||
d748c623 MW |
2360 | if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) |
2361 | wake = 1; | |
b22cd72c | 2362 | spin_unlock(&log->l_icloglock); |
d748c623 MW |
2363 | |
2364 | if (wake) | |
2365 | sv_broadcast(&log->l_flush_wait); | |
2366 | } | |
1da177e4 LT |
2367 | |
2368 | ||
2369 | /* | |
2370 | * Finish transitioning this iclog to the dirty state. | |
2371 | * | |
2372 | * Make sure that we completely execute this routine only when this is | |
2373 | * the last call to the iclog. There is a good chance that iclog flushes, | |
2374 | * when we reach the end of the physical log, get turned into 2 separate | |
2375 | * calls to bwrite. Hence, one iclog flush could generate two calls to this | |
2376 | * routine. By using the reference count bwritecnt, we guarantee that only | |
2377 | * the second completion goes through. | |
2378 | * | |
2379 | * Callbacks could take time, so they are done outside the scope of the | |
12017faf | 2380 | * global state machine log lock. |
1da177e4 | 2381 | */ |
a8272ce0 | 2382 | STATIC void |
1da177e4 LT |
2383 | xlog_state_done_syncing( |
2384 | xlog_in_core_t *iclog, | |
2385 | int aborted) | |
2386 | { | |
2387 | xlog_t *log = iclog->ic_log; | |
1da177e4 | 2388 | |
b22cd72c | 2389 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2390 | |
2391 | ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || | |
2392 | iclog->ic_state == XLOG_STATE_IOERROR); | |
155cc6b7 | 2393 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
2394 | ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); |
2395 | ||
2396 | ||
2397 | /* | |
2398 | * If we got an error, either on the first buffer, or in the case of | |
2399 | * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, | |
2400 | * and none should ever be attempted to be written to disk | |
2401 | * again. | |
2402 | */ | |
2403 | if (iclog->ic_state != XLOG_STATE_IOERROR) { | |
2404 | if (--iclog->ic_bwritecnt == 1) { | |
b22cd72c | 2405 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2406 | return; |
2407 | } | |
2408 | iclog->ic_state = XLOG_STATE_DONE_SYNC; | |
2409 | } | |
2410 | ||
2411 | /* | |
2412 | * Someone could be sleeping prior to writing out the next | |
2413 | * iclog buffer, we wake them all, one will get to do the | |
2414 | * I/O, the others get to wait for the result. | |
2415 | */ | |
12017faf | 2416 | sv_broadcast(&iclog->ic_write_wait); |
b22cd72c | 2417 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2418 | xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ |
2419 | } /* xlog_state_done_syncing */ | |
2420 | ||
2421 | ||
2422 | /* | |
2423 | * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must | |
12017faf DC |
2424 | * sleep. We wait on the flush queue on the head iclog as that should be |
2425 | * the first iclog to complete flushing. Hence if all iclogs are syncing, | |
2426 | * we will wait here and all new writes will sleep until a sync completes. | |
1da177e4 LT |
2427 | * |
2428 | * The in-core logs are used in a circular fashion. They are not used | |
2429 | * out-of-order even when an iclog past the head is free. | |
2430 | * | |
2431 | * return: | |
2432 | * * log_offset where xlog_write() can start writing into the in-core | |
2433 | * log's data space. | |
2434 | * * in-core log pointer to which xlog_write() should write. | |
2435 | * * boolean indicating this is a continued write to an in-core log. | |
2436 | * If this is the last write, then the in-core log's offset field | |
2437 | * needs to be incremented, depending on the amount of data which | |
2438 | * is copied. | |
2439 | */ | |
a8272ce0 | 2440 | STATIC int |
1da177e4 LT |
2441 | xlog_state_get_iclog_space(xlog_t *log, |
2442 | int len, | |
2443 | xlog_in_core_t **iclogp, | |
2444 | xlog_ticket_t *ticket, | |
2445 | int *continued_write, | |
2446 | int *logoffsetp) | |
2447 | { | |
1da177e4 LT |
2448 | int log_offset; |
2449 | xlog_rec_header_t *head; | |
2450 | xlog_in_core_t *iclog; | |
2451 | int error; | |
2452 | ||
2453 | restart: | |
b22cd72c | 2454 | spin_lock(&log->l_icloglock); |
1da177e4 | 2455 | if (XLOG_FORCED_SHUTDOWN(log)) { |
b22cd72c | 2456 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2457 | return XFS_ERROR(EIO); |
2458 | } | |
2459 | ||
2460 | iclog = log->l_iclog; | |
d748c623 | 2461 | if (iclog->ic_state != XLOG_STATE_ACTIVE) { |
1da177e4 | 2462 | XFS_STATS_INC(xs_log_noiclogs); |
d748c623 MW |
2463 | |
2464 | /* Wait for log writes to have flushed */ | |
2465 | sv_wait(&log->l_flush_wait, 0, &log->l_icloglock, 0); | |
1da177e4 LT |
2466 | goto restart; |
2467 | } | |
d748c623 | 2468 | |
1da177e4 LT |
2469 | head = &iclog->ic_header; |
2470 | ||
155cc6b7 | 2471 | atomic_inc(&iclog->ic_refcnt); /* prevents sync */ |
1da177e4 LT |
2472 | log_offset = iclog->ic_offset; |
2473 | ||
2474 | /* On the 1st write to an iclog, figure out lsn. This works | |
2475 | * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are | |
2476 | * committing to. If the offset is set, that's how many blocks | |
2477 | * must be written. | |
2478 | */ | |
2479 | if (log_offset == 0) { | |
2480 | ticket->t_curr_res -= log->l_iclog_hsize; | |
0adba536 | 2481 | xlog_tic_add_region(ticket, |
7e9c6396 TS |
2482 | log->l_iclog_hsize, |
2483 | XLOG_REG_TYPE_LRHEADER); | |
b53e675d CH |
2484 | head->h_cycle = cpu_to_be32(log->l_curr_cycle); |
2485 | head->h_lsn = cpu_to_be64( | |
03bea6fe | 2486 | xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); |
1da177e4 LT |
2487 | ASSERT(log->l_curr_block >= 0); |
2488 | } | |
2489 | ||
2490 | /* If there is enough room to write everything, then do it. Otherwise, | |
2491 | * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC | |
2492 | * bit is on, so this will get flushed out. Don't update ic_offset | |
2493 | * until you know exactly how many bytes get copied. Therefore, wait | |
2494 | * until later to update ic_offset. | |
2495 | * | |
2496 | * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's | |
2497 | * can fit into remaining data section. | |
2498 | */ | |
2499 | if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { | |
2500 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2501 | ||
49641f1a DC |
2502 | /* |
2503 | * If I'm the only one writing to this iclog, sync it to disk. | |
2504 | * We need to do an atomic compare and decrement here to avoid | |
2505 | * racing with concurrent atomic_dec_and_lock() calls in | |
2506 | * xlog_state_release_iclog() when there is more than one | |
2507 | * reference to the iclog. | |
2508 | */ | |
2509 | if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) { | |
2510 | /* we are the only one */ | |
b22cd72c | 2511 | spin_unlock(&log->l_icloglock); |
49641f1a DC |
2512 | error = xlog_state_release_iclog(log, iclog); |
2513 | if (error) | |
014c2544 | 2514 | return error; |
1da177e4 | 2515 | } else { |
b22cd72c | 2516 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2517 | } |
2518 | goto restart; | |
2519 | } | |
2520 | ||
2521 | /* Do we have enough room to write the full amount in the remainder | |
2522 | * of this iclog? Or must we continue a write on the next iclog and | |
2523 | * mark this iclog as completely taken? In the case where we switch | |
2524 | * iclogs (to mark it taken), this particular iclog will release/sync | |
2525 | * to disk in xlog_write(). | |
2526 | */ | |
2527 | if (len <= iclog->ic_size - iclog->ic_offset) { | |
2528 | *continued_write = 0; | |
2529 | iclog->ic_offset += len; | |
2530 | } else { | |
2531 | *continued_write = 1; | |
2532 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2533 | } | |
2534 | *iclogp = iclog; | |
2535 | ||
2536 | ASSERT(iclog->ic_offset <= iclog->ic_size); | |
b22cd72c | 2537 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2538 | |
2539 | *logoffsetp = log_offset; | |
2540 | return 0; | |
2541 | } /* xlog_state_get_iclog_space */ | |
2542 | ||
2543 | /* | |
2544 | * Atomically get the log space required for a log ticket. | |
2545 | * | |
2546 | * Once a ticket gets put onto the reserveq, it will only return after | |
2547 | * the needed reservation is satisfied. | |
2548 | */ | |
2549 | STATIC int | |
2550 | xlog_grant_log_space(xlog_t *log, | |
2551 | xlog_ticket_t *tic) | |
2552 | { | |
2553 | int free_bytes; | |
2554 | int need_bytes; | |
1da177e4 LT |
2555 | #ifdef DEBUG |
2556 | xfs_lsn_t tail_lsn; | |
2557 | #endif | |
2558 | ||
2559 | ||
2560 | #ifdef DEBUG | |
2561 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
2562 | panic("grant Recovery problem"); | |
2563 | #endif | |
2564 | ||
2565 | /* Is there space or do we need to sleep? */ | |
c8b5ea28 | 2566 | spin_lock(&log->l_grant_lock); |
0b1b213f CH |
2567 | |
2568 | trace_xfs_log_grant_enter(log, tic); | |
1da177e4 LT |
2569 | |
2570 | /* something is already sleeping; insert new transaction at end */ | |
2571 | if (log->l_reserve_headq) { | |
dd954c69 | 2572 | xlog_ins_ticketq(&log->l_reserve_headq, tic); |
0b1b213f CH |
2573 | |
2574 | trace_xfs_log_grant_sleep1(log, tic); | |
2575 | ||
1da177e4 LT |
2576 | /* |
2577 | * Gotta check this before going to sleep, while we're | |
2578 | * holding the grant lock. | |
2579 | */ | |
2580 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2581 | goto error_return; | |
2582 | ||
2583 | XFS_STATS_INC(xs_sleep_logspace); | |
12017faf | 2584 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); |
1da177e4 LT |
2585 | /* |
2586 | * If we got an error, and the filesystem is shutting down, | |
2587 | * we'll catch it down below. So just continue... | |
2588 | */ | |
0b1b213f | 2589 | trace_xfs_log_grant_wake1(log, tic); |
c8b5ea28 | 2590 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2591 | } |
2592 | if (tic->t_flags & XFS_LOG_PERM_RESERV) | |
2593 | need_bytes = tic->t_unit_res*tic->t_ocnt; | |
2594 | else | |
2595 | need_bytes = tic->t_unit_res; | |
2596 | ||
2597 | redo: | |
2598 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2599 | goto error_return; | |
2600 | ||
2601 | free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, | |
2602 | log->l_grant_reserve_bytes); | |
2603 | if (free_bytes < need_bytes) { | |
2604 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
dd954c69 | 2605 | xlog_ins_ticketq(&log->l_reserve_headq, tic); |
0b1b213f CH |
2606 | |
2607 | trace_xfs_log_grant_sleep2(log, tic); | |
2608 | ||
9d7fef74 DC |
2609 | spin_unlock(&log->l_grant_lock); |
2610 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
2611 | spin_lock(&log->l_grant_lock); | |
2612 | ||
1da177e4 | 2613 | XFS_STATS_INC(xs_sleep_logspace); |
12017faf | 2614 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); |
1da177e4 | 2615 | |
9d7fef74 DC |
2616 | spin_lock(&log->l_grant_lock); |
2617 | if (XLOG_FORCED_SHUTDOWN(log)) | |
1da177e4 | 2618 | goto error_return; |
1da177e4 | 2619 | |
0b1b213f CH |
2620 | trace_xfs_log_grant_wake2(log, tic); |
2621 | ||
1da177e4 LT |
2622 | goto redo; |
2623 | } else if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2624 | xlog_del_ticketq(&log->l_reserve_headq, tic); |
1da177e4 LT |
2625 | |
2626 | /* we've got enough space */ | |
dd954c69 | 2627 | xlog_grant_add_space(log, need_bytes); |
1da177e4 LT |
2628 | #ifdef DEBUG |
2629 | tail_lsn = log->l_tail_lsn; | |
2630 | /* | |
2631 | * Check to make sure the grant write head didn't just over lap the | |
2632 | * tail. If the cycles are the same, we can't be overlapping. | |
2633 | * Otherwise, make sure that the cycles differ by exactly one and | |
2634 | * check the byte count. | |
2635 | */ | |
2636 | if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { | |
2637 | ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); | |
2638 | ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); | |
2639 | } | |
2640 | #endif | |
0b1b213f | 2641 | trace_xfs_log_grant_exit(log, tic); |
1da177e4 | 2642 | xlog_verify_grant_head(log, 1); |
c8b5ea28 | 2643 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2644 | return 0; |
2645 | ||
2646 | error_return: | |
2647 | if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2648 | xlog_del_ticketq(&log->l_reserve_headq, tic); |
0b1b213f CH |
2649 | |
2650 | trace_xfs_log_grant_error(log, tic); | |
2651 | ||
1da177e4 LT |
2652 | /* |
2653 | * If we are failing, make sure the ticket doesn't have any | |
2654 | * current reservations. We don't want to add this back when | |
2655 | * the ticket/transaction gets cancelled. | |
2656 | */ | |
2657 | tic->t_curr_res = 0; | |
2658 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
c8b5ea28 | 2659 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2660 | return XFS_ERROR(EIO); |
2661 | } /* xlog_grant_log_space */ | |
2662 | ||
2663 | ||
2664 | /* | |
2665 | * Replenish the byte reservation required by moving the grant write head. | |
2666 | * | |
2667 | * | |
2668 | */ | |
2669 | STATIC int | |
2670 | xlog_regrant_write_log_space(xlog_t *log, | |
2671 | xlog_ticket_t *tic) | |
2672 | { | |
1da177e4 LT |
2673 | int free_bytes, need_bytes; |
2674 | xlog_ticket_t *ntic; | |
2675 | #ifdef DEBUG | |
2676 | xfs_lsn_t tail_lsn; | |
2677 | #endif | |
2678 | ||
2679 | tic->t_curr_res = tic->t_unit_res; | |
0adba536 | 2680 | xlog_tic_reset_res(tic); |
1da177e4 LT |
2681 | |
2682 | if (tic->t_cnt > 0) | |
014c2544 | 2683 | return 0; |
1da177e4 LT |
2684 | |
2685 | #ifdef DEBUG | |
2686 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
2687 | panic("regrant Recovery problem"); | |
2688 | #endif | |
2689 | ||
c8b5ea28 | 2690 | spin_lock(&log->l_grant_lock); |
0b1b213f CH |
2691 | |
2692 | trace_xfs_log_regrant_write_enter(log, tic); | |
1da177e4 LT |
2693 | |
2694 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2695 | goto error_return; | |
2696 | ||
2697 | /* If there are other waiters on the queue then give them a | |
2698 | * chance at logspace before us. Wake up the first waiters, | |
2699 | * if we do not wake up all the waiters then go to sleep waiting | |
2700 | * for more free space, otherwise try to get some space for | |
2701 | * this transaction. | |
2702 | */ | |
9d7fef74 | 2703 | need_bytes = tic->t_unit_res; |
1da177e4 LT |
2704 | if ((ntic = log->l_write_headq)) { |
2705 | free_bytes = xlog_space_left(log, log->l_grant_write_cycle, | |
2706 | log->l_grant_write_bytes); | |
2707 | do { | |
2708 | ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); | |
2709 | ||
2710 | if (free_bytes < ntic->t_unit_res) | |
2711 | break; | |
2712 | free_bytes -= ntic->t_unit_res; | |
12017faf | 2713 | sv_signal(&ntic->t_wait); |
1da177e4 LT |
2714 | ntic = ntic->t_next; |
2715 | } while (ntic != log->l_write_headq); | |
2716 | ||
2717 | if (ntic != log->l_write_headq) { | |
2718 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
dd954c69 | 2719 | xlog_ins_ticketq(&log->l_write_headq, tic); |
1da177e4 | 2720 | |
0b1b213f CH |
2721 | trace_xfs_log_regrant_write_sleep1(log, tic); |
2722 | ||
9d7fef74 DC |
2723 | spin_unlock(&log->l_grant_lock); |
2724 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
2725 | spin_lock(&log->l_grant_lock); | |
2726 | ||
1da177e4 | 2727 | XFS_STATS_INC(xs_sleep_logspace); |
12017faf | 2728 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, |
1da177e4 LT |
2729 | &log->l_grant_lock, s); |
2730 | ||
2731 | /* If we're shutting down, this tic is already | |
2732 | * off the queue */ | |
9d7fef74 DC |
2733 | spin_lock(&log->l_grant_lock); |
2734 | if (XLOG_FORCED_SHUTDOWN(log)) | |
1da177e4 | 2735 | goto error_return; |
1da177e4 | 2736 | |
0b1b213f | 2737 | trace_xfs_log_regrant_write_wake1(log, tic); |
1da177e4 LT |
2738 | } |
2739 | } | |
2740 | ||
1da177e4 LT |
2741 | redo: |
2742 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2743 | goto error_return; | |
2744 | ||
2745 | free_bytes = xlog_space_left(log, log->l_grant_write_cycle, | |
2746 | log->l_grant_write_bytes); | |
2747 | if (free_bytes < need_bytes) { | |
2748 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
dd954c69 | 2749 | xlog_ins_ticketq(&log->l_write_headq, tic); |
9d7fef74 DC |
2750 | spin_unlock(&log->l_grant_lock); |
2751 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
2752 | spin_lock(&log->l_grant_lock); | |
2753 | ||
1da177e4 | 2754 | XFS_STATS_INC(xs_sleep_logspace); |
0b1b213f CH |
2755 | trace_xfs_log_regrant_write_sleep2(log, tic); |
2756 | ||
12017faf | 2757 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); |
1da177e4 LT |
2758 | |
2759 | /* If we're shutting down, this tic is already off the queue */ | |
9d7fef74 DC |
2760 | spin_lock(&log->l_grant_lock); |
2761 | if (XLOG_FORCED_SHUTDOWN(log)) | |
1da177e4 | 2762 | goto error_return; |
1da177e4 | 2763 | |
0b1b213f | 2764 | trace_xfs_log_regrant_write_wake2(log, tic); |
1da177e4 LT |
2765 | goto redo; |
2766 | } else if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2767 | xlog_del_ticketq(&log->l_write_headq, tic); |
1da177e4 | 2768 | |
dd954c69 CH |
2769 | /* we've got enough space */ |
2770 | xlog_grant_add_space_write(log, need_bytes); | |
1da177e4 LT |
2771 | #ifdef DEBUG |
2772 | tail_lsn = log->l_tail_lsn; | |
2773 | if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { | |
2774 | ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); | |
2775 | ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); | |
2776 | } | |
2777 | #endif | |
2778 | ||
0b1b213f CH |
2779 | trace_xfs_log_regrant_write_exit(log, tic); |
2780 | ||
1da177e4 | 2781 | xlog_verify_grant_head(log, 1); |
c8b5ea28 | 2782 | spin_unlock(&log->l_grant_lock); |
014c2544 | 2783 | return 0; |
1da177e4 LT |
2784 | |
2785 | ||
2786 | error_return: | |
2787 | if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2788 | xlog_del_ticketq(&log->l_reserve_headq, tic); |
0b1b213f CH |
2789 | |
2790 | trace_xfs_log_regrant_write_error(log, tic); | |
2791 | ||
1da177e4 LT |
2792 | /* |
2793 | * If we are failing, make sure the ticket doesn't have any | |
2794 | * current reservations. We don't want to add this back when | |
2795 | * the ticket/transaction gets cancelled. | |
2796 | */ | |
2797 | tic->t_curr_res = 0; | |
2798 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
c8b5ea28 | 2799 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2800 | return XFS_ERROR(EIO); |
2801 | } /* xlog_regrant_write_log_space */ | |
2802 | ||
2803 | ||
2804 | /* The first cnt-1 times through here we don't need to | |
2805 | * move the grant write head because the permanent | |
2806 | * reservation has reserved cnt times the unit amount. | |
2807 | * Release part of current permanent unit reservation and | |
2808 | * reset current reservation to be one units worth. Also | |
2809 | * move grant reservation head forward. | |
2810 | */ | |
2811 | STATIC void | |
2812 | xlog_regrant_reserve_log_space(xlog_t *log, | |
2813 | xlog_ticket_t *ticket) | |
2814 | { | |
0b1b213f CH |
2815 | trace_xfs_log_regrant_reserve_enter(log, ticket); |
2816 | ||
1da177e4 LT |
2817 | if (ticket->t_cnt > 0) |
2818 | ticket->t_cnt--; | |
2819 | ||
c8b5ea28 | 2820 | spin_lock(&log->l_grant_lock); |
dd954c69 | 2821 | xlog_grant_sub_space(log, ticket->t_curr_res); |
1da177e4 | 2822 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2823 | xlog_tic_reset_res(ticket); |
0b1b213f CH |
2824 | |
2825 | trace_xfs_log_regrant_reserve_sub(log, ticket); | |
2826 | ||
1da177e4 LT |
2827 | xlog_verify_grant_head(log, 1); |
2828 | ||
2829 | /* just return if we still have some of the pre-reserved space */ | |
2830 | if (ticket->t_cnt > 0) { | |
c8b5ea28 | 2831 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2832 | return; |
2833 | } | |
2834 | ||
dd954c69 | 2835 | xlog_grant_add_space_reserve(log, ticket->t_unit_res); |
0b1b213f CH |
2836 | |
2837 | trace_xfs_log_regrant_reserve_exit(log, ticket); | |
2838 | ||
1da177e4 | 2839 | xlog_verify_grant_head(log, 0); |
c8b5ea28 | 2840 | spin_unlock(&log->l_grant_lock); |
1da177e4 | 2841 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2842 | xlog_tic_reset_res(ticket); |
1da177e4 LT |
2843 | } /* xlog_regrant_reserve_log_space */ |
2844 | ||
2845 | ||
2846 | /* | |
2847 | * Give back the space left from a reservation. | |
2848 | * | |
2849 | * All the information we need to make a correct determination of space left | |
2850 | * is present. For non-permanent reservations, things are quite easy. The | |
2851 | * count should have been decremented to zero. We only need to deal with the | |
2852 | * space remaining in the current reservation part of the ticket. If the | |
2853 | * ticket contains a permanent reservation, there may be left over space which | |
2854 | * needs to be released. A count of N means that N-1 refills of the current | |
2855 | * reservation can be done before we need to ask for more space. The first | |
2856 | * one goes to fill up the first current reservation. Once we run out of | |
2857 | * space, the count will stay at zero and the only space remaining will be | |
2858 | * in the current reservation field. | |
2859 | */ | |
2860 | STATIC void | |
2861 | xlog_ungrant_log_space(xlog_t *log, | |
2862 | xlog_ticket_t *ticket) | |
2863 | { | |
1da177e4 LT |
2864 | if (ticket->t_cnt > 0) |
2865 | ticket->t_cnt--; | |
2866 | ||
c8b5ea28 | 2867 | spin_lock(&log->l_grant_lock); |
0b1b213f | 2868 | trace_xfs_log_ungrant_enter(log, ticket); |
1da177e4 | 2869 | |
dd954c69 | 2870 | xlog_grant_sub_space(log, ticket->t_curr_res); |
1da177e4 | 2871 | |
0b1b213f | 2872 | trace_xfs_log_ungrant_sub(log, ticket); |
1da177e4 LT |
2873 | |
2874 | /* If this is a permanent reservation ticket, we may be able to free | |
2875 | * up more space based on the remaining count. | |
2876 | */ | |
2877 | if (ticket->t_cnt > 0) { | |
2878 | ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); | |
dd954c69 | 2879 | xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt); |
1da177e4 LT |
2880 | } |
2881 | ||
0b1b213f CH |
2882 | trace_xfs_log_ungrant_exit(log, ticket); |
2883 | ||
1da177e4 | 2884 | xlog_verify_grant_head(log, 1); |
c8b5ea28 | 2885 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2886 | xfs_log_move_tail(log->l_mp, 1); |
2887 | } /* xlog_ungrant_log_space */ | |
2888 | ||
2889 | ||
1da177e4 LT |
2890 | /* |
2891 | * Flush iclog to disk if this is the last reference to the given iclog and | |
2892 | * the WANT_SYNC bit is set. | |
2893 | * | |
2894 | * When this function is entered, the iclog is not necessarily in the | |
2895 | * WANT_SYNC state. It may be sitting around waiting to get filled. | |
2896 | * | |
2897 | * | |
2898 | */ | |
a8272ce0 | 2899 | STATIC int |
b589334c DC |
2900 | xlog_state_release_iclog( |
2901 | xlog_t *log, | |
2902 | xlog_in_core_t *iclog) | |
1da177e4 | 2903 | { |
1da177e4 LT |
2904 | int sync = 0; /* do we sync? */ |
2905 | ||
155cc6b7 DC |
2906 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
2907 | return XFS_ERROR(EIO); | |
2908 | ||
2909 | ASSERT(atomic_read(&iclog->ic_refcnt) > 0); | |
2910 | if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) | |
2911 | return 0; | |
2912 | ||
1da177e4 | 2913 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
b22cd72c | 2914 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2915 | return XFS_ERROR(EIO); |
2916 | } | |
1da177e4 LT |
2917 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || |
2918 | iclog->ic_state == XLOG_STATE_WANT_SYNC); | |
2919 | ||
155cc6b7 | 2920 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { |
b589334c DC |
2921 | /* update tail before writing to iclog */ |
2922 | xlog_assign_tail_lsn(log->l_mp); | |
1da177e4 LT |
2923 | sync++; |
2924 | iclog->ic_state = XLOG_STATE_SYNCING; | |
b53e675d | 2925 | iclog->ic_header.h_tail_lsn = cpu_to_be64(log->l_tail_lsn); |
1da177e4 LT |
2926 | xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); |
2927 | /* cycle incremented when incrementing curr_block */ | |
2928 | } | |
b22cd72c | 2929 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2930 | |
2931 | /* | |
2932 | * We let the log lock go, so it's possible that we hit a log I/O | |
c41564b5 | 2933 | * error or some other SHUTDOWN condition that marks the iclog |
1da177e4 LT |
2934 | * as XLOG_STATE_IOERROR before the bwrite. However, we know that |
2935 | * this iclog has consistent data, so we ignore IOERROR | |
2936 | * flags after this point. | |
2937 | */ | |
b589334c | 2938 | if (sync) |
1da177e4 | 2939 | return xlog_sync(log, iclog); |
014c2544 | 2940 | return 0; |
1da177e4 LT |
2941 | } /* xlog_state_release_iclog */ |
2942 | ||
2943 | ||
2944 | /* | |
2945 | * This routine will mark the current iclog in the ring as WANT_SYNC | |
2946 | * and move the current iclog pointer to the next iclog in the ring. | |
2947 | * When this routine is called from xlog_state_get_iclog_space(), the | |
2948 | * exact size of the iclog has not yet been determined. All we know is | |
2949 | * that every data block. We have run out of space in this log record. | |
2950 | */ | |
2951 | STATIC void | |
2952 | xlog_state_switch_iclogs(xlog_t *log, | |
2953 | xlog_in_core_t *iclog, | |
2954 | int eventual_size) | |
2955 | { | |
2956 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
2957 | if (!eventual_size) | |
2958 | eventual_size = iclog->ic_offset; | |
2959 | iclog->ic_state = XLOG_STATE_WANT_SYNC; | |
b53e675d | 2960 | iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); |
1da177e4 LT |
2961 | log->l_prev_block = log->l_curr_block; |
2962 | log->l_prev_cycle = log->l_curr_cycle; | |
2963 | ||
2964 | /* roll log?: ic_offset changed later */ | |
2965 | log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); | |
2966 | ||
2967 | /* Round up to next log-sunit */ | |
62118709 | 2968 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
1da177e4 LT |
2969 | log->l_mp->m_sb.sb_logsunit > 1) { |
2970 | __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); | |
2971 | log->l_curr_block = roundup(log->l_curr_block, sunit_bb); | |
2972 | } | |
2973 | ||
2974 | if (log->l_curr_block >= log->l_logBBsize) { | |
2975 | log->l_curr_cycle++; | |
2976 | if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) | |
2977 | log->l_curr_cycle++; | |
2978 | log->l_curr_block -= log->l_logBBsize; | |
2979 | ASSERT(log->l_curr_block >= 0); | |
2980 | } | |
2981 | ASSERT(iclog == log->l_iclog); | |
2982 | log->l_iclog = iclog->ic_next; | |
2983 | } /* xlog_state_switch_iclogs */ | |
2984 | ||
1da177e4 LT |
2985 | /* |
2986 | * Write out all data in the in-core log as of this exact moment in time. | |
2987 | * | |
2988 | * Data may be written to the in-core log during this call. However, | |
2989 | * we don't guarantee this data will be written out. A change from past | |
2990 | * implementation means this routine will *not* write out zero length LRs. | |
2991 | * | |
2992 | * Basically, we try and perform an intelligent scan of the in-core logs. | |
2993 | * If we determine there is no flushable data, we just return. There is no | |
2994 | * flushable data if: | |
2995 | * | |
2996 | * 1. the current iclog is active and has no data; the previous iclog | |
2997 | * is in the active or dirty state. | |
2998 | * 2. the current iclog is drity, and the previous iclog is in the | |
2999 | * active or dirty state. | |
3000 | * | |
12017faf | 3001 | * We may sleep if: |
1da177e4 LT |
3002 | * |
3003 | * 1. the current iclog is not in the active nor dirty state. | |
3004 | * 2. the current iclog dirty, and the previous iclog is not in the | |
3005 | * active nor dirty state. | |
3006 | * 3. the current iclog is active, and there is another thread writing | |
3007 | * to this particular iclog. | |
3008 | * 4. a) the current iclog is active and has no other writers | |
3009 | * b) when we return from flushing out this iclog, it is still | |
3010 | * not in the active nor dirty state. | |
3011 | */ | |
a14a348b CH |
3012 | int |
3013 | _xfs_log_force( | |
3014 | struct xfs_mount *mp, | |
3015 | uint flags, | |
3016 | int *log_flushed) | |
1da177e4 | 3017 | { |
a14a348b CH |
3018 | struct log *log = mp->m_log; |
3019 | struct xlog_in_core *iclog; | |
3020 | xfs_lsn_t lsn; | |
3021 | ||
3022 | XFS_STATS_INC(xs_log_force); | |
1da177e4 | 3023 | |
71e330b5 DC |
3024 | xlog_cil_push(log, 1); |
3025 | ||
b22cd72c | 3026 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3027 | |
3028 | iclog = log->l_iclog; | |
3029 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3030 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3031 | return XFS_ERROR(EIO); |
3032 | } | |
3033 | ||
3034 | /* If the head iclog is not active nor dirty, we just attach | |
3035 | * ourselves to the head and go to sleep. | |
3036 | */ | |
3037 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
3038 | iclog->ic_state == XLOG_STATE_DIRTY) { | |
3039 | /* | |
3040 | * If the head is dirty or (active and empty), then | |
3041 | * we need to look at the previous iclog. If the previous | |
3042 | * iclog is active or dirty we are done. There is nothing | |
3043 | * to sync out. Otherwise, we attach ourselves to the | |
3044 | * previous iclog and go to sleep. | |
3045 | */ | |
3046 | if (iclog->ic_state == XLOG_STATE_DIRTY || | |
155cc6b7 DC |
3047 | (atomic_read(&iclog->ic_refcnt) == 0 |
3048 | && iclog->ic_offset == 0)) { | |
1da177e4 LT |
3049 | iclog = iclog->ic_prev; |
3050 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
3051 | iclog->ic_state == XLOG_STATE_DIRTY) | |
3052 | goto no_sleep; | |
3053 | else | |
3054 | goto maybe_sleep; | |
3055 | } else { | |
155cc6b7 | 3056 | if (atomic_read(&iclog->ic_refcnt) == 0) { |
1da177e4 LT |
3057 | /* We are the only one with access to this |
3058 | * iclog. Flush it out now. There should | |
3059 | * be a roundoff of zero to show that someone | |
3060 | * has already taken care of the roundoff from | |
3061 | * the previous sync. | |
3062 | */ | |
155cc6b7 | 3063 | atomic_inc(&iclog->ic_refcnt); |
b53e675d | 3064 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
1da177e4 | 3065 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 3066 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3067 | |
3068 | if (xlog_state_release_iclog(log, iclog)) | |
3069 | return XFS_ERROR(EIO); | |
a14a348b CH |
3070 | |
3071 | if (log_flushed) | |
3072 | *log_flushed = 1; | |
b22cd72c | 3073 | spin_lock(&log->l_icloglock); |
b53e675d | 3074 | if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn && |
1da177e4 LT |
3075 | iclog->ic_state != XLOG_STATE_DIRTY) |
3076 | goto maybe_sleep; | |
3077 | else | |
3078 | goto no_sleep; | |
3079 | } else { | |
3080 | /* Someone else is writing to this iclog. | |
3081 | * Use its call to flush out the data. However, | |
3082 | * the other thread may not force out this LR, | |
3083 | * so we mark it WANT_SYNC. | |
3084 | */ | |
3085 | xlog_state_switch_iclogs(log, iclog, 0); | |
3086 | goto maybe_sleep; | |
3087 | } | |
3088 | } | |
3089 | } | |
3090 | ||
3091 | /* By the time we come around again, the iclog could've been filled | |
3092 | * which would give it another lsn. If we have a new lsn, just | |
3093 | * return because the relevant data has been flushed. | |
3094 | */ | |
3095 | maybe_sleep: | |
3096 | if (flags & XFS_LOG_SYNC) { | |
3097 | /* | |
3098 | * We must check if we're shutting down here, before | |
b22cd72c | 3099 | * we wait, while we're holding the l_icloglock. |
1da177e4 LT |
3100 | * Then we check again after waking up, in case our |
3101 | * sleep was disturbed by a bad news. | |
3102 | */ | |
3103 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3104 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3105 | return XFS_ERROR(EIO); |
3106 | } | |
3107 | XFS_STATS_INC(xs_log_force_sleep); | |
12017faf | 3108 | sv_wait(&iclog->ic_force_wait, PINOD, &log->l_icloglock, s); |
1da177e4 LT |
3109 | /* |
3110 | * No need to grab the log lock here since we're | |
3111 | * only deciding whether or not to return EIO | |
3112 | * and the memory read should be atomic. | |
3113 | */ | |
3114 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3115 | return XFS_ERROR(EIO); | |
a14a348b CH |
3116 | if (log_flushed) |
3117 | *log_flushed = 1; | |
1da177e4 LT |
3118 | } else { |
3119 | ||
3120 | no_sleep: | |
b22cd72c | 3121 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3122 | } |
3123 | return 0; | |
a14a348b | 3124 | } |
1da177e4 | 3125 | |
a14a348b CH |
3126 | /* |
3127 | * Wrapper for _xfs_log_force(), to be used when caller doesn't care | |
3128 | * about errors or whether the log was flushed or not. This is the normal | |
3129 | * interface to use when trying to unpin items or move the log forward. | |
3130 | */ | |
3131 | void | |
3132 | xfs_log_force( | |
3133 | xfs_mount_t *mp, | |
3134 | uint flags) | |
3135 | { | |
3136 | int error; | |
3137 | ||
3138 | error = _xfs_log_force(mp, flags, NULL); | |
3139 | if (error) { | |
3140 | xfs_fs_cmn_err(CE_WARN, mp, "xfs_log_force: " | |
3141 | "error %d returned.", error); | |
3142 | } | |
3143 | } | |
1da177e4 LT |
3144 | |
3145 | /* | |
a14a348b | 3146 | * Force the in-core log to disk for a specific LSN. |
1da177e4 LT |
3147 | * |
3148 | * Find in-core log with lsn. | |
3149 | * If it is in the DIRTY state, just return. | |
3150 | * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC | |
3151 | * state and go to sleep or return. | |
3152 | * If it is in any other state, go to sleep or return. | |
3153 | * | |
a14a348b CH |
3154 | * Synchronous forces are implemented with a signal variable. All callers |
3155 | * to force a given lsn to disk will wait on a the sv attached to the | |
3156 | * specific in-core log. When given in-core log finally completes its | |
3157 | * write to disk, that thread will wake up all threads waiting on the | |
3158 | * sv. | |
1da177e4 | 3159 | */ |
a14a348b CH |
3160 | int |
3161 | _xfs_log_force_lsn( | |
3162 | struct xfs_mount *mp, | |
3163 | xfs_lsn_t lsn, | |
3164 | uint flags, | |
3165 | int *log_flushed) | |
1da177e4 | 3166 | { |
a14a348b CH |
3167 | struct log *log = mp->m_log; |
3168 | struct xlog_in_core *iclog; | |
3169 | int already_slept = 0; | |
1da177e4 | 3170 | |
a14a348b | 3171 | ASSERT(lsn != 0); |
1da177e4 | 3172 | |
a14a348b | 3173 | XFS_STATS_INC(xs_log_force); |
1da177e4 | 3174 | |
71e330b5 DC |
3175 | if (log->l_cilp) { |
3176 | lsn = xlog_cil_push_lsn(log, lsn); | |
3177 | if (lsn == NULLCOMMITLSN) | |
3178 | return 0; | |
3179 | } | |
3180 | ||
a14a348b CH |
3181 | try_again: |
3182 | spin_lock(&log->l_icloglock); | |
3183 | iclog = log->l_iclog; | |
3184 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3185 | spin_unlock(&log->l_icloglock); |
a14a348b | 3186 | return XFS_ERROR(EIO); |
1da177e4 LT |
3187 | } |
3188 | ||
a14a348b CH |
3189 | do { |
3190 | if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { | |
3191 | iclog = iclog->ic_next; | |
3192 | continue; | |
3193 | } | |
3194 | ||
3195 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
3196 | spin_unlock(&log->l_icloglock); | |
3197 | return 0; | |
3198 | } | |
3199 | ||
3200 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3201 | /* | |
3202 | * We sleep here if we haven't already slept (e.g. | |
3203 | * this is the first time we've looked at the correct | |
3204 | * iclog buf) and the buffer before us is going to | |
3205 | * be sync'ed. The reason for this is that if we | |
3206 | * are doing sync transactions here, by waiting for | |
3207 | * the previous I/O to complete, we can allow a few | |
3208 | * more transactions into this iclog before we close | |
3209 | * it down. | |
3210 | * | |
3211 | * Otherwise, we mark the buffer WANT_SYNC, and bump | |
3212 | * up the refcnt so we can release the log (which | |
3213 | * drops the ref count). The state switch keeps new | |
3214 | * transaction commits from using this buffer. When | |
3215 | * the current commits finish writing into the buffer, | |
3216 | * the refcount will drop to zero and the buffer will | |
3217 | * go out then. | |
3218 | */ | |
3219 | if (!already_slept && | |
3220 | (iclog->ic_prev->ic_state & | |
3221 | (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) { | |
3222 | ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); | |
3223 | ||
3224 | XFS_STATS_INC(xs_log_force_sleep); | |
3225 | ||
3226 | sv_wait(&iclog->ic_prev->ic_write_wait, | |
3227 | PSWP, &log->l_icloglock, s); | |
3228 | if (log_flushed) | |
3229 | *log_flushed = 1; | |
3230 | already_slept = 1; | |
3231 | goto try_again; | |
3232 | } | |
155cc6b7 | 3233 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 3234 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 3235 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3236 | if (xlog_state_release_iclog(log, iclog)) |
3237 | return XFS_ERROR(EIO); | |
a14a348b CH |
3238 | if (log_flushed) |
3239 | *log_flushed = 1; | |
b22cd72c | 3240 | spin_lock(&log->l_icloglock); |
1da177e4 | 3241 | } |
1da177e4 | 3242 | |
a14a348b CH |
3243 | if ((flags & XFS_LOG_SYNC) && /* sleep */ |
3244 | !(iclog->ic_state & | |
3245 | (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { | |
3246 | /* | |
3247 | * Don't wait on completion if we know that we've | |
3248 | * gotten a log write error. | |
3249 | */ | |
3250 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
3251 | spin_unlock(&log->l_icloglock); | |
3252 | return XFS_ERROR(EIO); | |
3253 | } | |
3254 | XFS_STATS_INC(xs_log_force_sleep); | |
3255 | sv_wait(&iclog->ic_force_wait, PSWP, &log->l_icloglock, s); | |
3256 | /* | |
3257 | * No need to grab the log lock here since we're | |
3258 | * only deciding whether or not to return EIO | |
3259 | * and the memory read should be atomic. | |
3260 | */ | |
3261 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3262 | return XFS_ERROR(EIO); | |
1da177e4 | 3263 | |
a14a348b CH |
3264 | if (log_flushed) |
3265 | *log_flushed = 1; | |
3266 | } else { /* just return */ | |
b22cd72c | 3267 | spin_unlock(&log->l_icloglock); |
1da177e4 | 3268 | } |
1da177e4 | 3269 | |
a14a348b CH |
3270 | return 0; |
3271 | } while (iclog != log->l_iclog); | |
1da177e4 | 3272 | |
a14a348b CH |
3273 | spin_unlock(&log->l_icloglock); |
3274 | return 0; | |
3275 | } | |
3276 | ||
3277 | /* | |
3278 | * Wrapper for _xfs_log_force_lsn(), to be used when caller doesn't care | |
3279 | * about errors or whether the log was flushed or not. This is the normal | |
3280 | * interface to use when trying to unpin items or move the log forward. | |
3281 | */ | |
3282 | void | |
3283 | xfs_log_force_lsn( | |
3284 | xfs_mount_t *mp, | |
3285 | xfs_lsn_t lsn, | |
3286 | uint flags) | |
3287 | { | |
3288 | int error; | |
1da177e4 | 3289 | |
a14a348b CH |
3290 | error = _xfs_log_force_lsn(mp, lsn, flags, NULL); |
3291 | if (error) { | |
3292 | xfs_fs_cmn_err(CE_WARN, mp, "xfs_log_force: " | |
3293 | "error %d returned.", error); | |
3294 | } | |
3295 | } | |
1da177e4 LT |
3296 | |
3297 | /* | |
3298 | * Called when we want to mark the current iclog as being ready to sync to | |
3299 | * disk. | |
3300 | */ | |
a8272ce0 | 3301 | STATIC void |
1da177e4 LT |
3302 | xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) |
3303 | { | |
a8914f3a | 3304 | assert_spin_locked(&log->l_icloglock); |
1da177e4 LT |
3305 | |
3306 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3307 | xlog_state_switch_iclogs(log, iclog, 0); | |
3308 | } else { | |
3309 | ASSERT(iclog->ic_state & | |
3310 | (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); | |
3311 | } | |
39e2defe | 3312 | } |
1da177e4 LT |
3313 | |
3314 | ||
3315 | /***************************************************************************** | |
3316 | * | |
3317 | * TICKET functions | |
3318 | * | |
3319 | ***************************************************************************** | |
3320 | */ | |
3321 | ||
3322 | /* | |
9da096fd | 3323 | * Free a used ticket when its refcount falls to zero. |
1da177e4 | 3324 | */ |
cc09c0dc DC |
3325 | void |
3326 | xfs_log_ticket_put( | |
3327 | xlog_ticket_t *ticket) | |
1da177e4 | 3328 | { |
cc09c0dc DC |
3329 | ASSERT(atomic_read(&ticket->t_ref) > 0); |
3330 | if (atomic_dec_and_test(&ticket->t_ref)) { | |
3331 | sv_destroy(&ticket->t_wait); | |
3332 | kmem_zone_free(xfs_log_ticket_zone, ticket); | |
3333 | } | |
3334 | } | |
1da177e4 | 3335 | |
cc09c0dc DC |
3336 | xlog_ticket_t * |
3337 | xfs_log_ticket_get( | |
3338 | xlog_ticket_t *ticket) | |
3339 | { | |
3340 | ASSERT(atomic_read(&ticket->t_ref) > 0); | |
3341 | atomic_inc(&ticket->t_ref); | |
3342 | return ticket; | |
3343 | } | |
1da177e4 | 3344 | |
955833cf DC |
3345 | xlog_tid_t |
3346 | xfs_log_get_trans_ident( | |
3347 | struct xfs_trans *tp) | |
3348 | { | |
3349 | return tp->t_ticket->t_tid; | |
3350 | } | |
3351 | ||
1da177e4 | 3352 | /* |
eb01c9cd | 3353 | * Allocate and initialise a new log ticket. |
1da177e4 | 3354 | */ |
71e330b5 | 3355 | xlog_ticket_t * |
9b9fc2b7 DC |
3356 | xlog_ticket_alloc( |
3357 | struct log *log, | |
3358 | int unit_bytes, | |
3359 | int cnt, | |
3360 | char client, | |
3383ca57 DC |
3361 | uint xflags, |
3362 | int alloc_flags) | |
1da177e4 | 3363 | { |
9b9fc2b7 | 3364 | struct xlog_ticket *tic; |
1da177e4 | 3365 | uint num_headers; |
9b9fc2b7 | 3366 | int iclog_space; |
1da177e4 | 3367 | |
3383ca57 | 3368 | tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags); |
eb01c9cd DC |
3369 | if (!tic) |
3370 | return NULL; | |
1da177e4 LT |
3371 | |
3372 | /* | |
3373 | * Permanent reservations have up to 'cnt'-1 active log operations | |
3374 | * in the log. A unit in this case is the amount of space for one | |
3375 | * of these log operations. Normal reservations have a cnt of 1 | |
3376 | * and their unit amount is the total amount of space required. | |
3377 | * | |
3378 | * The following lines of code account for non-transaction data | |
32fb9b57 TS |
3379 | * which occupy space in the on-disk log. |
3380 | * | |
3381 | * Normal form of a transaction is: | |
3382 | * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> | |
3383 | * and then there are LR hdrs, split-recs and roundoff at end of syncs. | |
3384 | * | |
3385 | * We need to account for all the leadup data and trailer data | |
3386 | * around the transaction data. | |
3387 | * And then we need to account for the worst case in terms of using | |
3388 | * more space. | |
3389 | * The worst case will happen if: | |
3390 | * - the placement of the transaction happens to be such that the | |
3391 | * roundoff is at its maximum | |
3392 | * - the transaction data is synced before the commit record is synced | |
3393 | * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> | |
3394 | * Therefore the commit record is in its own Log Record. | |
3395 | * This can happen as the commit record is called with its | |
3396 | * own region to xlog_write(). | |
3397 | * This then means that in the worst case, roundoff can happen for | |
3398 | * the commit-rec as well. | |
3399 | * The commit-rec is smaller than padding in this scenario and so it is | |
3400 | * not added separately. | |
1da177e4 LT |
3401 | */ |
3402 | ||
32fb9b57 TS |
3403 | /* for trans header */ |
3404 | unit_bytes += sizeof(xlog_op_header_t); | |
3405 | unit_bytes += sizeof(xfs_trans_header_t); | |
3406 | ||
1da177e4 | 3407 | /* for start-rec */ |
32fb9b57 TS |
3408 | unit_bytes += sizeof(xlog_op_header_t); |
3409 | ||
9b9fc2b7 DC |
3410 | /* |
3411 | * for LR headers - the space for data in an iclog is the size minus | |
3412 | * the space used for the headers. If we use the iclog size, then we | |
3413 | * undercalculate the number of headers required. | |
3414 | * | |
3415 | * Furthermore - the addition of op headers for split-recs might | |
3416 | * increase the space required enough to require more log and op | |
3417 | * headers, so take that into account too. | |
3418 | * | |
3419 | * IMPORTANT: This reservation makes the assumption that if this | |
3420 | * transaction is the first in an iclog and hence has the LR headers | |
3421 | * accounted to it, then the remaining space in the iclog is | |
3422 | * exclusively for this transaction. i.e. if the transaction is larger | |
3423 | * than the iclog, it will be the only thing in that iclog. | |
3424 | * Fundamentally, this means we must pass the entire log vector to | |
3425 | * xlog_write to guarantee this. | |
3426 | */ | |
3427 | iclog_space = log->l_iclog_size - log->l_iclog_hsize; | |
3428 | num_headers = howmany(unit_bytes, iclog_space); | |
3429 | ||
3430 | /* for split-recs - ophdrs added when data split over LRs */ | |
3431 | unit_bytes += sizeof(xlog_op_header_t) * num_headers; | |
3432 | ||
3433 | /* add extra header reservations if we overrun */ | |
3434 | while (!num_headers || | |
3435 | howmany(unit_bytes, iclog_space) > num_headers) { | |
3436 | unit_bytes += sizeof(xlog_op_header_t); | |
3437 | num_headers++; | |
3438 | } | |
32fb9b57 | 3439 | unit_bytes += log->l_iclog_hsize * num_headers; |
1da177e4 | 3440 | |
32fb9b57 TS |
3441 | /* for commit-rec LR header - note: padding will subsume the ophdr */ |
3442 | unit_bytes += log->l_iclog_hsize; | |
3443 | ||
32fb9b57 | 3444 | /* for roundoff padding for transaction data and one for commit record */ |
62118709 | 3445 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
32fb9b57 | 3446 | log->l_mp->m_sb.sb_logsunit > 1) { |
1da177e4 | 3447 | /* log su roundoff */ |
32fb9b57 | 3448 | unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; |
1da177e4 LT |
3449 | } else { |
3450 | /* BB roundoff */ | |
32fb9b57 | 3451 | unit_bytes += 2*BBSIZE; |
1da177e4 LT |
3452 | } |
3453 | ||
cc09c0dc | 3454 | atomic_set(&tic->t_ref, 1); |
1da177e4 LT |
3455 | tic->t_unit_res = unit_bytes; |
3456 | tic->t_curr_res = unit_bytes; | |
3457 | tic->t_cnt = cnt; | |
3458 | tic->t_ocnt = cnt; | |
f9837107 | 3459 | tic->t_tid = random32(); |
1da177e4 LT |
3460 | tic->t_clientid = client; |
3461 | tic->t_flags = XLOG_TIC_INITED; | |
7e9c6396 | 3462 | tic->t_trans_type = 0; |
1da177e4 LT |
3463 | if (xflags & XFS_LOG_PERM_RESERV) |
3464 | tic->t_flags |= XLOG_TIC_PERM_RESERV; | |
9b9fc2b7 | 3465 | sv_init(&tic->t_wait, SV_DEFAULT, "logtick"); |
1da177e4 | 3466 | |
0adba536 | 3467 | xlog_tic_reset_res(tic); |
7e9c6396 | 3468 | |
1da177e4 | 3469 | return tic; |
cc09c0dc | 3470 | } |
1da177e4 LT |
3471 | |
3472 | ||
3473 | /****************************************************************************** | |
3474 | * | |
3475 | * Log debug routines | |
3476 | * | |
3477 | ****************************************************************************** | |
3478 | */ | |
cfcbbbd0 | 3479 | #if defined(DEBUG) |
1da177e4 LT |
3480 | /* |
3481 | * Make sure that the destination ptr is within the valid data region of | |
3482 | * one of the iclogs. This uses backup pointers stored in a different | |
3483 | * part of the log in case we trash the log structure. | |
3484 | */ | |
3485 | void | |
e6b1f273 CH |
3486 | xlog_verify_dest_ptr( |
3487 | struct log *log, | |
3488 | char *ptr) | |
1da177e4 LT |
3489 | { |
3490 | int i; | |
3491 | int good_ptr = 0; | |
3492 | ||
e6b1f273 CH |
3493 | for (i = 0; i < log->l_iclog_bufs; i++) { |
3494 | if (ptr >= log->l_iclog_bak[i] && | |
3495 | ptr <= log->l_iclog_bak[i] + log->l_iclog_size) | |
1da177e4 LT |
3496 | good_ptr++; |
3497 | } | |
e6b1f273 CH |
3498 | |
3499 | if (!good_ptr) | |
1da177e4 | 3500 | xlog_panic("xlog_verify_dest_ptr: invalid ptr"); |
e6b1f273 | 3501 | } |
1da177e4 LT |
3502 | |
3503 | STATIC void | |
3504 | xlog_verify_grant_head(xlog_t *log, int equals) | |
3505 | { | |
3506 | if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { | |
3507 | if (equals) | |
3508 | ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); | |
3509 | else | |
3510 | ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); | |
3511 | } else { | |
3512 | ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); | |
3513 | ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); | |
3514 | } | |
3515 | } /* xlog_verify_grant_head */ | |
3516 | ||
3517 | /* check if it will fit */ | |
3518 | STATIC void | |
3519 | xlog_verify_tail_lsn(xlog_t *log, | |
3520 | xlog_in_core_t *iclog, | |
3521 | xfs_lsn_t tail_lsn) | |
3522 | { | |
3523 | int blocks; | |
3524 | ||
3525 | if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { | |
3526 | blocks = | |
3527 | log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); | |
3528 | if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) | |
3529 | xlog_panic("xlog_verify_tail_lsn: ran out of log space"); | |
3530 | } else { | |
3531 | ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); | |
3532 | ||
3533 | if (BLOCK_LSN(tail_lsn) == log->l_prev_block) | |
3534 | xlog_panic("xlog_verify_tail_lsn: tail wrapped"); | |
3535 | ||
3536 | blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; | |
3537 | if (blocks < BTOBB(iclog->ic_offset) + 1) | |
3538 | xlog_panic("xlog_verify_tail_lsn: ran out of log space"); | |
3539 | } | |
3540 | } /* xlog_verify_tail_lsn */ | |
3541 | ||
3542 | /* | |
3543 | * Perform a number of checks on the iclog before writing to disk. | |
3544 | * | |
3545 | * 1. Make sure the iclogs are still circular | |
3546 | * 2. Make sure we have a good magic number | |
3547 | * 3. Make sure we don't have magic numbers in the data | |
3548 | * 4. Check fields of each log operation header for: | |
3549 | * A. Valid client identifier | |
3550 | * B. tid ptr value falls in valid ptr space (user space code) | |
3551 | * C. Length in log record header is correct according to the | |
3552 | * individual operation headers within record. | |
3553 | * 5. When a bwrite will occur within 5 blocks of the front of the physical | |
3554 | * log, check the preceding blocks of the physical log to make sure all | |
3555 | * the cycle numbers agree with the current cycle number. | |
3556 | */ | |
3557 | STATIC void | |
3558 | xlog_verify_iclog(xlog_t *log, | |
3559 | xlog_in_core_t *iclog, | |
3560 | int count, | |
3561 | boolean_t syncing) | |
3562 | { | |
3563 | xlog_op_header_t *ophead; | |
3564 | xlog_in_core_t *icptr; | |
3565 | xlog_in_core_2_t *xhdr; | |
3566 | xfs_caddr_t ptr; | |
3567 | xfs_caddr_t base_ptr; | |
3568 | __psint_t field_offset; | |
3569 | __uint8_t clientid; | |
3570 | int len, i, j, k, op_len; | |
3571 | int idx; | |
1da177e4 LT |
3572 | |
3573 | /* check validity of iclog pointers */ | |
b22cd72c | 3574 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3575 | icptr = log->l_iclog; |
3576 | for (i=0; i < log->l_iclog_bufs; i++) { | |
4b80916b | 3577 | if (icptr == NULL) |
1da177e4 LT |
3578 | xlog_panic("xlog_verify_iclog: invalid ptr"); |
3579 | icptr = icptr->ic_next; | |
3580 | } | |
3581 | if (icptr != log->l_iclog) | |
3582 | xlog_panic("xlog_verify_iclog: corrupt iclog ring"); | |
b22cd72c | 3583 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3584 | |
3585 | /* check log magic numbers */ | |
b53e675d | 3586 | if (be32_to_cpu(iclog->ic_header.h_magicno) != XLOG_HEADER_MAGIC_NUM) |
1da177e4 LT |
3587 | xlog_panic("xlog_verify_iclog: invalid magic num"); |
3588 | ||
b53e675d CH |
3589 | ptr = (xfs_caddr_t) &iclog->ic_header; |
3590 | for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count; | |
1da177e4 | 3591 | ptr += BBSIZE) { |
b53e675d | 3592 | if (be32_to_cpu(*(__be32 *)ptr) == XLOG_HEADER_MAGIC_NUM) |
1da177e4 LT |
3593 | xlog_panic("xlog_verify_iclog: unexpected magic num"); |
3594 | } | |
3595 | ||
3596 | /* check fields */ | |
b53e675d | 3597 | len = be32_to_cpu(iclog->ic_header.h_num_logops); |
1da177e4 LT |
3598 | ptr = iclog->ic_datap; |
3599 | base_ptr = ptr; | |
3600 | ophead = (xlog_op_header_t *)ptr; | |
b28708d6 | 3601 | xhdr = iclog->ic_data; |
1da177e4 LT |
3602 | for (i = 0; i < len; i++) { |
3603 | ophead = (xlog_op_header_t *)ptr; | |
3604 | ||
3605 | /* clientid is only 1 byte */ | |
3606 | field_offset = (__psint_t) | |
3607 | ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); | |
3608 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
3609 | clientid = ophead->oh_clientid; | |
3610 | } else { | |
3611 | idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); | |
3612 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3613 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3614 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
03bea6fe CH |
3615 | clientid = xlog_get_client_id( |
3616 | xhdr[j].hic_xheader.xh_cycle_data[k]); | |
1da177e4 | 3617 | } else { |
03bea6fe CH |
3618 | clientid = xlog_get_client_id( |
3619 | iclog->ic_header.h_cycle_data[idx]); | |
1da177e4 LT |
3620 | } |
3621 | } | |
3622 | if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) | |
da1650a5 CH |
3623 | cmn_err(CE_WARN, "xlog_verify_iclog: " |
3624 | "invalid clientid %d op 0x%p offset 0x%lx", | |
3625 | clientid, ophead, (unsigned long)field_offset); | |
1da177e4 LT |
3626 | |
3627 | /* check length */ | |
3628 | field_offset = (__psint_t) | |
3629 | ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); | |
3630 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
67fcb7bf | 3631 | op_len = be32_to_cpu(ophead->oh_len); |
1da177e4 LT |
3632 | } else { |
3633 | idx = BTOBBT((__psint_t)&ophead->oh_len - | |
3634 | (__psint_t)iclog->ic_datap); | |
3635 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3636 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3637 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
b53e675d | 3638 | op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); |
1da177e4 | 3639 | } else { |
b53e675d | 3640 | op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); |
1da177e4 LT |
3641 | } |
3642 | } | |
3643 | ptr += sizeof(xlog_op_header_t) + op_len; | |
3644 | } | |
3645 | } /* xlog_verify_iclog */ | |
cfcbbbd0 | 3646 | #endif |
1da177e4 LT |
3647 | |
3648 | /* | |
b22cd72c | 3649 | * Mark all iclogs IOERROR. l_icloglock is held by the caller. |
1da177e4 LT |
3650 | */ |
3651 | STATIC int | |
3652 | xlog_state_ioerror( | |
3653 | xlog_t *log) | |
3654 | { | |
3655 | xlog_in_core_t *iclog, *ic; | |
3656 | ||
3657 | iclog = log->l_iclog; | |
3658 | if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3659 | /* | |
3660 | * Mark all the incore logs IOERROR. | |
3661 | * From now on, no log flushes will result. | |
3662 | */ | |
3663 | ic = iclog; | |
3664 | do { | |
3665 | ic->ic_state = XLOG_STATE_IOERROR; | |
3666 | ic = ic->ic_next; | |
3667 | } while (ic != iclog); | |
014c2544 | 3668 | return 0; |
1da177e4 LT |
3669 | } |
3670 | /* | |
3671 | * Return non-zero, if state transition has already happened. | |
3672 | */ | |
014c2544 | 3673 | return 1; |
1da177e4 LT |
3674 | } |
3675 | ||
3676 | /* | |
3677 | * This is called from xfs_force_shutdown, when we're forcibly | |
3678 | * shutting down the filesystem, typically because of an IO error. | |
3679 | * Our main objectives here are to make sure that: | |
3680 | * a. the filesystem gets marked 'SHUTDOWN' for all interested | |
3681 | * parties to find out, 'atomically'. | |
3682 | * b. those who're sleeping on log reservations, pinned objects and | |
3683 | * other resources get woken up, and be told the bad news. | |
3684 | * c. nothing new gets queued up after (a) and (b) are done. | |
3685 | * d. if !logerror, flush the iclogs to disk, then seal them off | |
3686 | * for business. | |
9da1ab18 DC |
3687 | * |
3688 | * Note: for delayed logging the !logerror case needs to flush the regions | |
3689 | * held in memory out to the iclogs before flushing them to disk. This needs | |
3690 | * to be done before the log is marked as shutdown, otherwise the flush to the | |
3691 | * iclogs will fail. | |
1da177e4 LT |
3692 | */ |
3693 | int | |
3694 | xfs_log_force_umount( | |
3695 | struct xfs_mount *mp, | |
3696 | int logerror) | |
3697 | { | |
3698 | xlog_ticket_t *tic; | |
3699 | xlog_t *log; | |
3700 | int retval; | |
1da177e4 LT |
3701 | |
3702 | log = mp->m_log; | |
3703 | ||
3704 | /* | |
3705 | * If this happens during log recovery, don't worry about | |
3706 | * locking; the log isn't open for business yet. | |
3707 | */ | |
3708 | if (!log || | |
3709 | log->l_flags & XLOG_ACTIVE_RECOVERY) { | |
3710 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
bac8dca9 CH |
3711 | if (mp->m_sb_bp) |
3712 | XFS_BUF_DONE(mp->m_sb_bp); | |
014c2544 | 3713 | return 0; |
1da177e4 LT |
3714 | } |
3715 | ||
3716 | /* | |
3717 | * Somebody could've already done the hard work for us. | |
3718 | * No need to get locks for this. | |
3719 | */ | |
3720 | if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { | |
3721 | ASSERT(XLOG_FORCED_SHUTDOWN(log)); | |
014c2544 | 3722 | return 1; |
1da177e4 LT |
3723 | } |
3724 | retval = 0; | |
9da1ab18 DC |
3725 | |
3726 | /* | |
3727 | * Flush the in memory commit item list before marking the log as | |
3728 | * being shut down. We need to do it in this order to ensure all the | |
3729 | * completed transactions are flushed to disk with the xfs_log_force() | |
3730 | * call below. | |
3731 | */ | |
3732 | if (!logerror && (mp->m_flags & XFS_MOUNT_DELAYLOG)) | |
3733 | xlog_cil_push(log, 1); | |
3734 | ||
1da177e4 LT |
3735 | /* |
3736 | * We must hold both the GRANT lock and the LOG lock, | |
3737 | * before we mark the filesystem SHUTDOWN and wake | |
3738 | * everybody up to tell the bad news. | |
3739 | */ | |
b22cd72c | 3740 | spin_lock(&log->l_icloglock); |
6b1d1a73 | 3741 | spin_lock(&log->l_grant_lock); |
1da177e4 | 3742 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
bac8dca9 CH |
3743 | if (mp->m_sb_bp) |
3744 | XFS_BUF_DONE(mp->m_sb_bp); | |
3745 | ||
1da177e4 LT |
3746 | /* |
3747 | * This flag is sort of redundant because of the mount flag, but | |
3748 | * it's good to maintain the separation between the log and the rest | |
3749 | * of XFS. | |
3750 | */ | |
3751 | log->l_flags |= XLOG_IO_ERROR; | |
3752 | ||
3753 | /* | |
3754 | * If we hit a log error, we want to mark all the iclogs IOERROR | |
3755 | * while we're still holding the loglock. | |
3756 | */ | |
3757 | if (logerror) | |
3758 | retval = xlog_state_ioerror(log); | |
b22cd72c | 3759 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3760 | |
3761 | /* | |
3762 | * We don't want anybody waiting for log reservations | |
3763 | * after this. That means we have to wake up everybody | |
3764 | * queued up on reserve_headq as well as write_headq. | |
3765 | * In addition, we make sure in xlog_{re}grant_log_space | |
3766 | * that we don't enqueue anything once the SHUTDOWN flag | |
3767 | * is set, and this action is protected by the GRANTLOCK. | |
3768 | */ | |
3769 | if ((tic = log->l_reserve_headq)) { | |
3770 | do { | |
12017faf | 3771 | sv_signal(&tic->t_wait); |
1da177e4 LT |
3772 | tic = tic->t_next; |
3773 | } while (tic != log->l_reserve_headq); | |
3774 | } | |
3775 | ||
3776 | if ((tic = log->l_write_headq)) { | |
3777 | do { | |
12017faf | 3778 | sv_signal(&tic->t_wait); |
1da177e4 LT |
3779 | tic = tic->t_next; |
3780 | } while (tic != log->l_write_headq); | |
3781 | } | |
c8b5ea28 | 3782 | spin_unlock(&log->l_grant_lock); |
1da177e4 | 3783 | |
a14a348b | 3784 | if (!(log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { |
1da177e4 LT |
3785 | ASSERT(!logerror); |
3786 | /* | |
3787 | * Force the incore logs to disk before shutting the | |
3788 | * log down completely. | |
3789 | */ | |
a14a348b CH |
3790 | _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
3791 | ||
b22cd72c | 3792 | spin_lock(&log->l_icloglock); |
1da177e4 | 3793 | retval = xlog_state_ioerror(log); |
b22cd72c | 3794 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3795 | } |
3796 | /* | |
3797 | * Wake up everybody waiting on xfs_log_force. | |
3798 | * Callback all log item committed functions as if the | |
3799 | * log writes were completed. | |
3800 | */ | |
3801 | xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); | |
3802 | ||
3803 | #ifdef XFSERRORDEBUG | |
3804 | { | |
3805 | xlog_in_core_t *iclog; | |
3806 | ||
b22cd72c | 3807 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3808 | iclog = log->l_iclog; |
3809 | do { | |
3810 | ASSERT(iclog->ic_callback == 0); | |
3811 | iclog = iclog->ic_next; | |
3812 | } while (iclog != log->l_iclog); | |
b22cd72c | 3813 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3814 | } |
3815 | #endif | |
3816 | /* return non-zero if log IOERROR transition had already happened */ | |
014c2544 | 3817 | return retval; |
1da177e4 LT |
3818 | } |
3819 | ||
ba0f32d4 | 3820 | STATIC int |
1da177e4 LT |
3821 | xlog_iclogs_empty(xlog_t *log) |
3822 | { | |
3823 | xlog_in_core_t *iclog; | |
3824 | ||
3825 | iclog = log->l_iclog; | |
3826 | do { | |
3827 | /* endianness does not matter here, zero is zero in | |
3828 | * any language. | |
3829 | */ | |
3830 | if (iclog->ic_header.h_num_logops) | |
014c2544 | 3831 | return 0; |
1da177e4 LT |
3832 | iclog = iclog->ic_next; |
3833 | } while (iclog != log->l_iclog); | |
014c2544 | 3834 | return 1; |
1da177e4 | 3835 | } |