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Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 | 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); | |
c8a09ff8 | 50 | STATIC int xlog_space_left(struct log *log, atomic64_t *head); |
1da177e4 | 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); | |
2ced19cb | 73 | STATIC void xlog_grant_push_ail(struct log *log, |
1da177e4 LT |
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); |
3f336c6f | 84 | STATIC void xlog_verify_grant_tail(struct log *log); |
1da177e4 LT |
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) | |
3f336c6f | 91 | #define xlog_verify_grant_tail(a) |
1da177e4 LT |
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 | 98 | static void |
663e496a DC |
99 | xlog_grant_sub_space( |
100 | struct log *log, | |
c8a09ff8 | 101 | atomic64_t *head, |
663e496a | 102 | int bytes) |
dd954c69 | 103 | { |
d0eb2f38 DC |
104 | int64_t head_val = atomic64_read(head); |
105 | int64_t new, old; | |
a69ed03c | 106 | |
d0eb2f38 DC |
107 | do { |
108 | int cycle, space; | |
a69ed03c | 109 | |
d0eb2f38 | 110 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 111 | |
d0eb2f38 DC |
112 | space -= bytes; |
113 | if (space < 0) { | |
114 | space += log->l_logsize; | |
115 | cycle--; | |
116 | } | |
117 | ||
118 | old = head_val; | |
119 | new = xlog_assign_grant_head_val(cycle, space); | |
120 | head_val = atomic64_cmpxchg(head, old, new); | |
121 | } while (head_val != old); | |
dd954c69 CH |
122 | } |
123 | ||
124 | static void | |
663e496a DC |
125 | xlog_grant_add_space( |
126 | struct log *log, | |
c8a09ff8 | 127 | atomic64_t *head, |
663e496a | 128 | int bytes) |
dd954c69 | 129 | { |
d0eb2f38 DC |
130 | int64_t head_val = atomic64_read(head); |
131 | int64_t new, old; | |
a69ed03c | 132 | |
d0eb2f38 DC |
133 | do { |
134 | int tmp; | |
135 | int cycle, space; | |
a69ed03c | 136 | |
d0eb2f38 | 137 | xlog_crack_grant_head_val(head_val, &cycle, &space); |
a69ed03c | 138 | |
d0eb2f38 DC |
139 | tmp = log->l_logsize - space; |
140 | if (tmp > bytes) | |
141 | space += bytes; | |
142 | else { | |
143 | space = bytes - tmp; | |
144 | cycle++; | |
145 | } | |
146 | ||
147 | old = head_val; | |
148 | new = xlog_assign_grant_head_val(cycle, space); | |
149 | head_val = atomic64_cmpxchg(head, old, new); | |
150 | } while (head_val != old); | |
dd954c69 | 151 | } |
a69ed03c | 152 | |
9f9c19ec CH |
153 | STATIC bool |
154 | xlog_reserveq_wake( | |
155 | struct log *log, | |
156 | int *free_bytes) | |
157 | { | |
158 | struct xlog_ticket *tic; | |
159 | int need_bytes; | |
160 | ||
28496968 | 161 | list_for_each_entry(tic, &log->l_reserve_head.waiters, t_queue) { |
9f9c19ec CH |
162 | if (tic->t_flags & XLOG_TIC_PERM_RESERV) |
163 | need_bytes = tic->t_unit_res * tic->t_cnt; | |
164 | else | |
165 | need_bytes = tic->t_unit_res; | |
166 | ||
167 | if (*free_bytes < need_bytes) | |
168 | return false; | |
169 | *free_bytes -= need_bytes; | |
170 | ||
171 | trace_xfs_log_grant_wake_up(log, tic); | |
14a7235f | 172 | wake_up_process(tic->t_task); |
9f9c19ec CH |
173 | } |
174 | ||
175 | return true; | |
176 | } | |
177 | ||
178 | STATIC bool | |
179 | xlog_writeq_wake( | |
180 | struct log *log, | |
181 | int *free_bytes) | |
182 | { | |
183 | struct xlog_ticket *tic; | |
184 | int need_bytes; | |
185 | ||
28496968 | 186 | list_for_each_entry(tic, &log->l_write_head.waiters, t_queue) { |
9f9c19ec CH |
187 | ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); |
188 | ||
189 | need_bytes = tic->t_unit_res; | |
190 | ||
191 | if (*free_bytes < need_bytes) | |
192 | return false; | |
193 | *free_bytes -= need_bytes; | |
194 | ||
195 | trace_xfs_log_regrant_write_wake_up(log, tic); | |
14a7235f | 196 | wake_up_process(tic->t_task); |
9f9c19ec CH |
197 | } |
198 | ||
199 | return true; | |
200 | } | |
201 | ||
202 | STATIC int | |
203 | xlog_reserveq_wait( | |
204 | struct log *log, | |
205 | struct xlog_ticket *tic, | |
206 | int need_bytes) | |
207 | { | |
28496968 | 208 | list_add_tail(&tic->t_queue, &log->l_reserve_head.waiters); |
9f9c19ec CH |
209 | |
210 | do { | |
211 | if (XLOG_FORCED_SHUTDOWN(log)) | |
212 | goto shutdown; | |
213 | xlog_grant_push_ail(log, need_bytes); | |
214 | ||
14a7235f | 215 | __set_current_state(TASK_UNINTERRUPTIBLE); |
28496968 | 216 | spin_unlock(&log->l_reserve_head.lock); |
14a7235f | 217 | |
9f9c19ec | 218 | XFS_STATS_INC(xs_sleep_logspace); |
9f9c19ec | 219 | |
14a7235f CH |
220 | trace_xfs_log_grant_sleep(log, tic); |
221 | schedule(); | |
9f9c19ec CH |
222 | trace_xfs_log_grant_wake(log, tic); |
223 | ||
28496968 | 224 | spin_lock(&log->l_reserve_head.lock); |
9f9c19ec CH |
225 | if (XLOG_FORCED_SHUTDOWN(log)) |
226 | goto shutdown; | |
28496968 | 227 | } while (xlog_space_left(log, &log->l_reserve_head.grant) < need_bytes); |
9f9c19ec CH |
228 | |
229 | list_del_init(&tic->t_queue); | |
230 | return 0; | |
231 | shutdown: | |
232 | list_del_init(&tic->t_queue); | |
233 | return XFS_ERROR(EIO); | |
234 | } | |
235 | ||
236 | STATIC int | |
237 | xlog_writeq_wait( | |
238 | struct log *log, | |
239 | struct xlog_ticket *tic, | |
240 | int need_bytes) | |
241 | { | |
28496968 | 242 | list_add_tail(&tic->t_queue, &log->l_write_head.waiters); |
9f9c19ec CH |
243 | |
244 | do { | |
245 | if (XLOG_FORCED_SHUTDOWN(log)) | |
246 | goto shutdown; | |
247 | xlog_grant_push_ail(log, need_bytes); | |
248 | ||
14a7235f | 249 | __set_current_state(TASK_UNINTERRUPTIBLE); |
28496968 | 250 | spin_unlock(&log->l_write_head.lock); |
14a7235f | 251 | |
9f9c19ec | 252 | XFS_STATS_INC(xs_sleep_logspace); |
9f9c19ec | 253 | |
14a7235f CH |
254 | trace_xfs_log_regrant_write_sleep(log, tic); |
255 | schedule(); | |
9f9c19ec CH |
256 | trace_xfs_log_regrant_write_wake(log, tic); |
257 | ||
28496968 | 258 | spin_lock(&log->l_write_head.lock); |
9f9c19ec CH |
259 | if (XLOG_FORCED_SHUTDOWN(log)) |
260 | goto shutdown; | |
28496968 | 261 | } while (xlog_space_left(log, &log->l_write_head.grant) < need_bytes); |
9f9c19ec CH |
262 | |
263 | list_del_init(&tic->t_queue); | |
264 | return 0; | |
265 | shutdown: | |
266 | list_del_init(&tic->t_queue); | |
267 | return XFS_ERROR(EIO); | |
268 | } | |
269 | ||
0adba536 CH |
270 | static void |
271 | xlog_tic_reset_res(xlog_ticket_t *tic) | |
272 | { | |
273 | tic->t_res_num = 0; | |
274 | tic->t_res_arr_sum = 0; | |
275 | tic->t_res_num_ophdrs = 0; | |
276 | } | |
277 | ||
278 | static void | |
279 | xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) | |
280 | { | |
281 | if (tic->t_res_num == XLOG_TIC_LEN_MAX) { | |
282 | /* add to overflow and start again */ | |
283 | tic->t_res_o_flow += tic->t_res_arr_sum; | |
284 | tic->t_res_num = 0; | |
285 | tic->t_res_arr_sum = 0; | |
286 | } | |
287 | ||
288 | tic->t_res_arr[tic->t_res_num].r_len = len; | |
289 | tic->t_res_arr[tic->t_res_num].r_type = type; | |
290 | tic->t_res_arr_sum += len; | |
291 | tic->t_res_num++; | |
292 | } | |
dd954c69 | 293 | |
1da177e4 LT |
294 | /* |
295 | * NOTES: | |
296 | * | |
297 | * 1. currblock field gets updated at startup and after in-core logs | |
298 | * marked as with WANT_SYNC. | |
299 | */ | |
300 | ||
301 | /* | |
302 | * This routine is called when a user of a log manager ticket is done with | |
303 | * the reservation. If the ticket was ever used, then a commit record for | |
304 | * the associated transaction is written out as a log operation header with | |
305 | * no data. The flag XLOG_TIC_INITED is set when the first write occurs with | |
306 | * a given ticket. If the ticket was one with a permanent reservation, then | |
307 | * a few operations are done differently. Permanent reservation tickets by | |
308 | * default don't release the reservation. They just commit the current | |
309 | * transaction with the belief that the reservation is still needed. A flag | |
310 | * must be passed in before permanent reservations are actually released. | |
311 | * When these type of tickets are not released, they need to be set into | |
312 | * the inited state again. By doing this, a start record will be written | |
313 | * out when the next write occurs. | |
314 | */ | |
315 | xfs_lsn_t | |
35a8a72f CH |
316 | xfs_log_done( |
317 | struct xfs_mount *mp, | |
318 | struct xlog_ticket *ticket, | |
319 | struct xlog_in_core **iclog, | |
320 | uint flags) | |
1da177e4 | 321 | { |
35a8a72f CH |
322 | struct log *log = mp->m_log; |
323 | xfs_lsn_t lsn = 0; | |
1da177e4 | 324 | |
1da177e4 LT |
325 | if (XLOG_FORCED_SHUTDOWN(log) || |
326 | /* | |
327 | * If nothing was ever written, don't write out commit record. | |
328 | * If we get an error, just continue and give back the log ticket. | |
329 | */ | |
330 | (((ticket->t_flags & XLOG_TIC_INITED) == 0) && | |
55b66332 | 331 | (xlog_commit_record(log, ticket, iclog, &lsn)))) { |
1da177e4 LT |
332 | lsn = (xfs_lsn_t) -1; |
333 | if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { | |
334 | flags |= XFS_LOG_REL_PERM_RESERV; | |
335 | } | |
336 | } | |
337 | ||
338 | ||
339 | if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || | |
340 | (flags & XFS_LOG_REL_PERM_RESERV)) { | |
0b1b213f CH |
341 | trace_xfs_log_done_nonperm(log, ticket); |
342 | ||
1da177e4 | 343 | /* |
c41564b5 | 344 | * Release ticket if not permanent reservation or a specific |
1da177e4 LT |
345 | * request has been made to release a permanent reservation. |
346 | */ | |
347 | xlog_ungrant_log_space(log, ticket); | |
cc09c0dc | 348 | xfs_log_ticket_put(ticket); |
1da177e4 | 349 | } else { |
0b1b213f CH |
350 | trace_xfs_log_done_perm(log, ticket); |
351 | ||
1da177e4 | 352 | xlog_regrant_reserve_log_space(log, ticket); |
c6a7b0f8 LM |
353 | /* If this ticket was a permanent reservation and we aren't |
354 | * trying to release it, reset the inited flags; so next time | |
355 | * we write, a start record will be written out. | |
356 | */ | |
1da177e4 | 357 | ticket->t_flags |= XLOG_TIC_INITED; |
c6a7b0f8 | 358 | } |
1da177e4 LT |
359 | |
360 | return lsn; | |
35a8a72f | 361 | } |
1da177e4 | 362 | |
1da177e4 LT |
363 | /* |
364 | * Attaches a new iclog I/O completion callback routine during | |
365 | * transaction commit. If the log is in error state, a non-zero | |
366 | * return code is handed back and the caller is responsible for | |
367 | * executing the callback at an appropriate time. | |
368 | */ | |
369 | int | |
35a8a72f CH |
370 | xfs_log_notify( |
371 | struct xfs_mount *mp, | |
372 | struct xlog_in_core *iclog, | |
373 | xfs_log_callback_t *cb) | |
1da177e4 | 374 | { |
b22cd72c | 375 | int abortflg; |
1da177e4 | 376 | |
114d23aa | 377 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
378 | abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); |
379 | if (!abortflg) { | |
380 | ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || | |
381 | (iclog->ic_state == XLOG_STATE_WANT_SYNC)); | |
382 | cb->cb_next = NULL; | |
383 | *(iclog->ic_callback_tail) = cb; | |
384 | iclog->ic_callback_tail = &(cb->cb_next); | |
385 | } | |
114d23aa | 386 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 | 387 | return abortflg; |
35a8a72f | 388 | } |
1da177e4 LT |
389 | |
390 | int | |
35a8a72f CH |
391 | xfs_log_release_iclog( |
392 | struct xfs_mount *mp, | |
393 | struct xlog_in_core *iclog) | |
1da177e4 | 394 | { |
35a8a72f | 395 | if (xlog_state_release_iclog(mp->m_log, iclog)) { |
7d04a335 | 396 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 397 | return EIO; |
1da177e4 LT |
398 | } |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | /* | |
404 | * 1. Reserve an amount of on-disk log space and return a ticket corresponding | |
405 | * to the reservation. | |
406 | * 2. Potentially, push buffers at tail of log to disk. | |
407 | * | |
408 | * Each reservation is going to reserve extra space for a log record header. | |
409 | * When writes happen to the on-disk log, we don't subtract the length of the | |
410 | * log record header from any reservation. By wasting space in each | |
411 | * reservation, we prevent over allocation problems. | |
412 | */ | |
413 | int | |
35a8a72f CH |
414 | xfs_log_reserve( |
415 | struct xfs_mount *mp, | |
416 | int unit_bytes, | |
417 | int cnt, | |
418 | struct xlog_ticket **ticket, | |
419 | __uint8_t client, | |
420 | uint flags, | |
421 | uint t_type) | |
1da177e4 | 422 | { |
35a8a72f CH |
423 | struct log *log = mp->m_log; |
424 | struct xlog_ticket *internal_ticket; | |
425 | int retval = 0; | |
1da177e4 | 426 | |
1da177e4 | 427 | ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); |
1da177e4 LT |
428 | |
429 | if (XLOG_FORCED_SHUTDOWN(log)) | |
430 | return XFS_ERROR(EIO); | |
431 | ||
432 | XFS_STATS_INC(xs_try_logspace); | |
433 | ||
0b1b213f | 434 | |
1da177e4 LT |
435 | if (*ticket != NULL) { |
436 | ASSERT(flags & XFS_LOG_PERM_RESERV); | |
35a8a72f | 437 | internal_ticket = *ticket; |
0b1b213f | 438 | |
524ee36f DC |
439 | /* |
440 | * this is a new transaction on the ticket, so we need to | |
441 | * change the transaction ID so that the next transaction has a | |
442 | * different TID in the log. Just add one to the existing tid | |
443 | * so that we can see chains of rolling transactions in the log | |
444 | * easily. | |
445 | */ | |
446 | internal_ticket->t_tid++; | |
447 | ||
0b1b213f CH |
448 | trace_xfs_log_reserve(log, internal_ticket); |
449 | ||
2ced19cb | 450 | xlog_grant_push_ail(log, internal_ticket->t_unit_res); |
1da177e4 LT |
451 | retval = xlog_regrant_write_log_space(log, internal_ticket); |
452 | } else { | |
453 | /* may sleep if need to allocate more tickets */ | |
cc09c0dc | 454 | internal_ticket = xlog_ticket_alloc(log, unit_bytes, cnt, |
3383ca57 DC |
455 | client, flags, |
456 | KM_SLEEP|KM_MAYFAIL); | |
eb01c9cd DC |
457 | if (!internal_ticket) |
458 | return XFS_ERROR(ENOMEM); | |
7e9c6396 | 459 | internal_ticket->t_trans_type = t_type; |
1da177e4 | 460 | *ticket = internal_ticket; |
0b1b213f CH |
461 | |
462 | trace_xfs_log_reserve(log, internal_ticket); | |
463 | ||
2ced19cb | 464 | xlog_grant_push_ail(log, |
1da177e4 LT |
465 | (internal_ticket->t_unit_res * |
466 | internal_ticket->t_cnt)); | |
467 | retval = xlog_grant_log_space(log, internal_ticket); | |
468 | } | |
469 | ||
9f9c19ec CH |
470 | if (unlikely(retval)) { |
471 | /* | |
472 | * If we are failing, make sure the ticket doesn't have any | |
473 | * current reservations. We don't want to add this back | |
474 | * when the ticket/ transaction gets cancelled. | |
475 | */ | |
476 | internal_ticket->t_curr_res = 0; | |
477 | /* ungrant will give back unit_res * t_cnt. */ | |
478 | internal_ticket->t_cnt = 0; | |
479 | } | |
480 | ||
1da177e4 | 481 | return retval; |
9f9c19ec | 482 | } |
1da177e4 LT |
483 | |
484 | ||
485 | /* | |
486 | * Mount a log filesystem | |
487 | * | |
488 | * mp - ubiquitous xfs mount point structure | |
489 | * log_target - buftarg of on-disk log device | |
490 | * blk_offset - Start block # where block size is 512 bytes (BBSIZE) | |
491 | * num_bblocks - Number of BBSIZE blocks in on-disk log | |
492 | * | |
493 | * Return error or zero. | |
494 | */ | |
495 | int | |
249a8c11 DC |
496 | xfs_log_mount( |
497 | xfs_mount_t *mp, | |
498 | xfs_buftarg_t *log_target, | |
499 | xfs_daddr_t blk_offset, | |
500 | int num_bblks) | |
1da177e4 | 501 | { |
249a8c11 DC |
502 | int error; |
503 | ||
1da177e4 | 504 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) |
a0fa2b67 | 505 | xfs_notice(mp, "Mounting Filesystem"); |
1da177e4 | 506 | else { |
a0fa2b67 DC |
507 | xfs_notice(mp, |
508 | "Mounting filesystem in no-recovery mode. Filesystem will be inconsistent."); | |
bd186aa9 | 509 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
510 | } |
511 | ||
512 | mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); | |
a6cb767e DC |
513 | if (IS_ERR(mp->m_log)) { |
514 | error = -PTR_ERR(mp->m_log); | |
644c3567 DC |
515 | goto out; |
516 | } | |
1da177e4 | 517 | |
249a8c11 DC |
518 | /* |
519 | * Initialize the AIL now we have a log. | |
520 | */ | |
249a8c11 DC |
521 | error = xfs_trans_ail_init(mp); |
522 | if (error) { | |
a0fa2b67 | 523 | xfs_warn(mp, "AIL initialisation failed: error %d", error); |
26430752 | 524 | goto out_free_log; |
249a8c11 | 525 | } |
a9c21c1b | 526 | mp->m_log->l_ailp = mp->m_ail; |
249a8c11 | 527 | |
1da177e4 LT |
528 | /* |
529 | * skip log recovery on a norecovery mount. pretend it all | |
530 | * just worked. | |
531 | */ | |
532 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { | |
249a8c11 | 533 | int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
534 | |
535 | if (readonly) | |
bd186aa9 | 536 | mp->m_flags &= ~XFS_MOUNT_RDONLY; |
1da177e4 | 537 | |
65be6054 | 538 | error = xlog_recover(mp->m_log); |
1da177e4 LT |
539 | |
540 | if (readonly) | |
bd186aa9 | 541 | mp->m_flags |= XFS_MOUNT_RDONLY; |
1da177e4 | 542 | if (error) { |
a0fa2b67 DC |
543 | xfs_warn(mp, "log mount/recovery failed: error %d", |
544 | error); | |
26430752 | 545 | goto out_destroy_ail; |
1da177e4 LT |
546 | } |
547 | } | |
548 | ||
549 | /* Normal transactions can now occur */ | |
550 | mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; | |
551 | ||
71e330b5 DC |
552 | /* |
553 | * Now the log has been fully initialised and we know were our | |
554 | * space grant counters are, we can initialise the permanent ticket | |
555 | * needed for delayed logging to work. | |
556 | */ | |
557 | xlog_cil_init_post_recovery(mp->m_log); | |
558 | ||
1da177e4 | 559 | return 0; |
26430752 CH |
560 | |
561 | out_destroy_ail: | |
562 | xfs_trans_ail_destroy(mp); | |
563 | out_free_log: | |
564 | xlog_dealloc_log(mp->m_log); | |
644c3567 | 565 | out: |
249a8c11 | 566 | return error; |
26430752 | 567 | } |
1da177e4 LT |
568 | |
569 | /* | |
570 | * Finish the recovery of the file system. This is separate from | |
571 | * the xfs_log_mount() call, because it depends on the code in | |
572 | * xfs_mountfs() to read in the root and real-time bitmap inodes | |
573 | * between calling xfs_log_mount() and here. | |
574 | * | |
575 | * mp - ubiquitous xfs mount point structure | |
576 | */ | |
577 | int | |
4249023a | 578 | xfs_log_mount_finish(xfs_mount_t *mp) |
1da177e4 LT |
579 | { |
580 | int error; | |
581 | ||
582 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) | |
4249023a | 583 | error = xlog_recover_finish(mp->m_log); |
1da177e4 LT |
584 | else { |
585 | error = 0; | |
bd186aa9 | 586 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
587 | } |
588 | ||
589 | return error; | |
590 | } | |
591 | ||
1da177e4 LT |
592 | /* |
593 | * Final log writes as part of unmount. | |
594 | * | |
595 | * Mark the filesystem clean as unmount happens. Note that during relocation | |
596 | * this routine needs to be executed as part of source-bag while the | |
597 | * deallocation must not be done until source-end. | |
598 | */ | |
599 | ||
600 | /* | |
601 | * Unmount record used to have a string "Unmount filesystem--" in the | |
602 | * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). | |
603 | * We just write the magic number now since that particular field isn't | |
604 | * currently architecture converted and "nUmount" is a bit foo. | |
605 | * As far as I know, there weren't any dependencies on the old behaviour. | |
606 | */ | |
607 | ||
608 | int | |
609 | xfs_log_unmount_write(xfs_mount_t *mp) | |
610 | { | |
611 | xlog_t *log = mp->m_log; | |
612 | xlog_in_core_t *iclog; | |
613 | #ifdef DEBUG | |
614 | xlog_in_core_t *first_iclog; | |
615 | #endif | |
35a8a72f | 616 | xlog_ticket_t *tic = NULL; |
1da177e4 LT |
617 | xfs_lsn_t lsn; |
618 | int error; | |
1da177e4 | 619 | |
1da177e4 LT |
620 | /* |
621 | * Don't write out unmount record on read-only mounts. | |
622 | * Or, if we are doing a forced umount (typically because of IO errors). | |
623 | */ | |
bd186aa9 | 624 | if (mp->m_flags & XFS_MOUNT_RDONLY) |
1da177e4 LT |
625 | return 0; |
626 | ||
a14a348b | 627 | error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
b911ca04 | 628 | ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); |
1da177e4 LT |
629 | |
630 | #ifdef DEBUG | |
631 | first_iclog = iclog = log->l_iclog; | |
632 | do { | |
633 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
634 | ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); | |
635 | ASSERT(iclog->ic_offset == 0); | |
636 | } | |
637 | iclog = iclog->ic_next; | |
638 | } while (iclog != first_iclog); | |
639 | #endif | |
640 | if (! (XLOG_FORCED_SHUTDOWN(log))) { | |
955e47ad TS |
641 | error = xfs_log_reserve(mp, 600, 1, &tic, |
642 | XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); | |
1da177e4 | 643 | if (!error) { |
55b66332 DC |
644 | /* the data section must be 32 bit size aligned */ |
645 | struct { | |
646 | __uint16_t magic; | |
647 | __uint16_t pad1; | |
648 | __uint32_t pad2; /* may as well make it 64 bits */ | |
649 | } magic = { | |
650 | .magic = XLOG_UNMOUNT_TYPE, | |
651 | }; | |
652 | struct xfs_log_iovec reg = { | |
4e0d5f92 | 653 | .i_addr = &magic, |
55b66332 DC |
654 | .i_len = sizeof(magic), |
655 | .i_type = XLOG_REG_TYPE_UNMOUNT, | |
656 | }; | |
657 | struct xfs_log_vec vec = { | |
658 | .lv_niovecs = 1, | |
659 | .lv_iovecp = ®, | |
660 | }; | |
661 | ||
1da177e4 | 662 | /* remove inited flag */ |
55b66332 DC |
663 | tic->t_flags = 0; |
664 | error = xlog_write(log, &vec, tic, &lsn, | |
1da177e4 LT |
665 | NULL, XLOG_UNMOUNT_TRANS); |
666 | /* | |
667 | * At this point, we're umounting anyway, | |
668 | * so there's no point in transitioning log state | |
669 | * to IOERROR. Just continue... | |
670 | */ | |
671 | } | |
672 | ||
a0fa2b67 DC |
673 | if (error) |
674 | xfs_alert(mp, "%s: unmount record failed", __func__); | |
1da177e4 LT |
675 | |
676 | ||
b22cd72c | 677 | spin_lock(&log->l_icloglock); |
1da177e4 | 678 | iclog = log->l_iclog; |
155cc6b7 | 679 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 680 | xlog_state_want_sync(log, iclog); |
39e2defe | 681 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 682 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 683 | |
b22cd72c | 684 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
685 | if (!(iclog->ic_state == XLOG_STATE_ACTIVE || |
686 | iclog->ic_state == XLOG_STATE_DIRTY)) { | |
687 | if (!XLOG_FORCED_SHUTDOWN(log)) { | |
eb40a875 DC |
688 | xlog_wait(&iclog->ic_force_wait, |
689 | &log->l_icloglock); | |
1da177e4 | 690 | } else { |
b22cd72c | 691 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
692 | } |
693 | } else { | |
b22cd72c | 694 | spin_unlock(&log->l_icloglock); |
1da177e4 | 695 | } |
955e47ad | 696 | if (tic) { |
0b1b213f | 697 | trace_xfs_log_umount_write(log, tic); |
955e47ad | 698 | xlog_ungrant_log_space(log, tic); |
cc09c0dc | 699 | xfs_log_ticket_put(tic); |
955e47ad | 700 | } |
1da177e4 LT |
701 | } else { |
702 | /* | |
703 | * We're already in forced_shutdown mode, couldn't | |
704 | * even attempt to write out the unmount transaction. | |
705 | * | |
706 | * Go through the motions of sync'ing and releasing | |
707 | * the iclog, even though no I/O will actually happen, | |
c41564b5 | 708 | * we need to wait for other log I/Os that may already |
1da177e4 LT |
709 | * be in progress. Do this as a separate section of |
710 | * code so we'll know if we ever get stuck here that | |
711 | * we're in this odd situation of trying to unmount | |
712 | * a file system that went into forced_shutdown as | |
713 | * the result of an unmount.. | |
714 | */ | |
b22cd72c | 715 | spin_lock(&log->l_icloglock); |
1da177e4 | 716 | iclog = log->l_iclog; |
155cc6b7 | 717 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 LT |
718 | |
719 | xlog_state_want_sync(log, iclog); | |
39e2defe | 720 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 721 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 722 | |
b22cd72c | 723 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
724 | |
725 | if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE | |
726 | || iclog->ic_state == XLOG_STATE_DIRTY | |
727 | || iclog->ic_state == XLOG_STATE_IOERROR) ) { | |
728 | ||
eb40a875 DC |
729 | xlog_wait(&iclog->ic_force_wait, |
730 | &log->l_icloglock); | |
1da177e4 | 731 | } else { |
b22cd72c | 732 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
733 | } |
734 | } | |
735 | ||
1bb7d6b5 | 736 | return error; |
1da177e4 LT |
737 | } /* xfs_log_unmount_write */ |
738 | ||
739 | /* | |
740 | * Deallocate log structures for unmount/relocation. | |
249a8c11 DC |
741 | * |
742 | * We need to stop the aild from running before we destroy | |
743 | * and deallocate the log as the aild references the log. | |
1da177e4 LT |
744 | */ |
745 | void | |
21b699c8 | 746 | xfs_log_unmount(xfs_mount_t *mp) |
1da177e4 | 747 | { |
249a8c11 | 748 | xfs_trans_ail_destroy(mp); |
c41564b5 | 749 | xlog_dealloc_log(mp->m_log); |
1da177e4 LT |
750 | } |
751 | ||
43f5efc5 DC |
752 | void |
753 | xfs_log_item_init( | |
754 | struct xfs_mount *mp, | |
755 | struct xfs_log_item *item, | |
756 | int type, | |
272e42b2 | 757 | const struct xfs_item_ops *ops) |
43f5efc5 DC |
758 | { |
759 | item->li_mountp = mp; | |
760 | item->li_ailp = mp->m_ail; | |
761 | item->li_type = type; | |
762 | item->li_ops = ops; | |
71e330b5 DC |
763 | item->li_lv = NULL; |
764 | ||
765 | INIT_LIST_HEAD(&item->li_ail); | |
766 | INIT_LIST_HEAD(&item->li_cil); | |
43f5efc5 DC |
767 | } |
768 | ||
09a423a3 CH |
769 | /* |
770 | * Wake up processes waiting for log space after we have moved the log tail. | |
09a423a3 | 771 | */ |
1da177e4 | 772 | void |
09a423a3 | 773 | xfs_log_space_wake( |
cfb7cdca | 774 | struct xfs_mount *mp) |
1da177e4 | 775 | { |
09a423a3 | 776 | struct log *log = mp->m_log; |
cfb7cdca | 777 | int free_bytes; |
1da177e4 | 778 | |
1da177e4 LT |
779 | if (XLOG_FORCED_SHUTDOWN(log)) |
780 | return; | |
1da177e4 | 781 | |
28496968 | 782 | if (!list_empty_careful(&log->l_write_head.waiters)) { |
09a423a3 CH |
783 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
784 | ||
28496968 CH |
785 | spin_lock(&log->l_write_head.lock); |
786 | free_bytes = xlog_space_left(log, &log->l_write_head.grant); | |
cfb7cdca | 787 | xlog_writeq_wake(log, &free_bytes); |
28496968 | 788 | spin_unlock(&log->l_write_head.lock); |
1da177e4 | 789 | } |
10547941 | 790 | |
28496968 | 791 | if (!list_empty_careful(&log->l_reserve_head.waiters)) { |
09a423a3 CH |
792 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
793 | ||
28496968 CH |
794 | spin_lock(&log->l_reserve_head.lock); |
795 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); | |
cfb7cdca | 796 | xlog_reserveq_wake(log, &free_bytes); |
28496968 | 797 | spin_unlock(&log->l_reserve_head.lock); |
1da177e4 | 798 | } |
3f16b985 | 799 | } |
1da177e4 LT |
800 | |
801 | /* | |
802 | * Determine if we have a transaction that has gone to disk | |
b6f8dd49 DC |
803 | * that needs to be covered. To begin the transition to the idle state |
804 | * firstly the log needs to be idle (no AIL and nothing in the iclogs). | |
805 | * If we are then in a state where covering is needed, the caller is informed | |
806 | * that dummy transactions are required to move the log into the idle state. | |
807 | * | |
808 | * Because this is called as part of the sync process, we should also indicate | |
809 | * that dummy transactions should be issued in anything but the covered or | |
810 | * idle states. This ensures that the log tail is accurately reflected in | |
811 | * the log at the end of the sync, hence if a crash occurrs avoids replay | |
812 | * of transactions where the metadata is already on disk. | |
1da177e4 LT |
813 | */ |
814 | int | |
815 | xfs_log_need_covered(xfs_mount_t *mp) | |
816 | { | |
27d8d5fe | 817 | int needed = 0; |
1da177e4 | 818 | xlog_t *log = mp->m_log; |
1da177e4 | 819 | |
92821e2b | 820 | if (!xfs_fs_writable(mp)) |
1da177e4 LT |
821 | return 0; |
822 | ||
b22cd72c | 823 | spin_lock(&log->l_icloglock); |
b6f8dd49 DC |
824 | switch (log->l_covered_state) { |
825 | case XLOG_STATE_COVER_DONE: | |
826 | case XLOG_STATE_COVER_DONE2: | |
827 | case XLOG_STATE_COVER_IDLE: | |
828 | break; | |
829 | case XLOG_STATE_COVER_NEED: | |
830 | case XLOG_STATE_COVER_NEED2: | |
fd074841 | 831 | if (!xfs_ail_min_lsn(log->l_ailp) && |
b6f8dd49 DC |
832 | xlog_iclogs_empty(log)) { |
833 | if (log->l_covered_state == XLOG_STATE_COVER_NEED) | |
834 | log->l_covered_state = XLOG_STATE_COVER_DONE; | |
835 | else | |
836 | log->l_covered_state = XLOG_STATE_COVER_DONE2; | |
1da177e4 | 837 | } |
b6f8dd49 DC |
838 | /* FALLTHRU */ |
839 | default: | |
1da177e4 | 840 | needed = 1; |
b6f8dd49 | 841 | break; |
1da177e4 | 842 | } |
b22cd72c | 843 | spin_unlock(&log->l_icloglock); |
014c2544 | 844 | return needed; |
1da177e4 LT |
845 | } |
846 | ||
09a423a3 | 847 | /* |
1da177e4 LT |
848 | * We may be holding the log iclog lock upon entering this routine. |
849 | */ | |
850 | xfs_lsn_t | |
1c3cb9ec DC |
851 | xlog_assign_tail_lsn( |
852 | struct xfs_mount *mp) | |
1da177e4 | 853 | { |
1c3cb9ec DC |
854 | xfs_lsn_t tail_lsn; |
855 | struct log *log = mp->m_log; | |
1da177e4 | 856 | |
09a423a3 CH |
857 | /* |
858 | * To make sure we always have a valid LSN for the log tail we keep | |
859 | * track of the last LSN which was committed in log->l_last_sync_lsn, | |
860 | * and use that when the AIL was empty and xfs_ail_min_lsn returns 0. | |
861 | * | |
862 | * If the AIL has been emptied we also need to wake any process | |
863 | * waiting for this condition. | |
864 | */ | |
fd074841 | 865 | tail_lsn = xfs_ail_min_lsn(mp->m_ail); |
84f3c683 DC |
866 | if (!tail_lsn) |
867 | tail_lsn = atomic64_read(&log->l_last_sync_lsn); | |
1c3cb9ec | 868 | atomic64_set(&log->l_tail_lsn, tail_lsn); |
1da177e4 | 869 | return tail_lsn; |
1c3cb9ec | 870 | } |
1da177e4 LT |
871 | |
872 | /* | |
873 | * Return the space in the log between the tail and the head. The head | |
874 | * is passed in the cycle/bytes formal parms. In the special case where | |
875 | * the reserve head has wrapped passed the tail, this calculation is no | |
876 | * longer valid. In this case, just return 0 which means there is no space | |
877 | * in the log. This works for all places where this function is called | |
878 | * with the reserve head. Of course, if the write head were to ever | |
879 | * wrap the tail, we should blow up. Rather than catch this case here, | |
880 | * we depend on other ASSERTions in other parts of the code. XXXmiken | |
881 | * | |
882 | * This code also handles the case where the reservation head is behind | |
883 | * the tail. The details of this case are described below, but the end | |
884 | * result is that we return the size of the log as the amount of space left. | |
885 | */ | |
a8272ce0 | 886 | STATIC int |
a69ed03c DC |
887 | xlog_space_left( |
888 | struct log *log, | |
c8a09ff8 | 889 | atomic64_t *head) |
1da177e4 | 890 | { |
a69ed03c DC |
891 | int free_bytes; |
892 | int tail_bytes; | |
893 | int tail_cycle; | |
894 | int head_cycle; | |
895 | int head_bytes; | |
1da177e4 | 896 | |
a69ed03c | 897 | xlog_crack_grant_head(head, &head_cycle, &head_bytes); |
1c3cb9ec DC |
898 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_bytes); |
899 | tail_bytes = BBTOB(tail_bytes); | |
a69ed03c DC |
900 | if (tail_cycle == head_cycle && head_bytes >= tail_bytes) |
901 | free_bytes = log->l_logsize - (head_bytes - tail_bytes); | |
902 | else if (tail_cycle + 1 < head_cycle) | |
1da177e4 | 903 | return 0; |
a69ed03c DC |
904 | else if (tail_cycle < head_cycle) { |
905 | ASSERT(tail_cycle == (head_cycle - 1)); | |
906 | free_bytes = tail_bytes - head_bytes; | |
1da177e4 LT |
907 | } else { |
908 | /* | |
909 | * The reservation head is behind the tail. | |
910 | * In this case we just want to return the size of the | |
911 | * log as the amount of space left. | |
912 | */ | |
a0fa2b67 | 913 | xfs_alert(log->l_mp, |
1da177e4 LT |
914 | "xlog_space_left: head behind tail\n" |
915 | " tail_cycle = %d, tail_bytes = %d\n" | |
916 | " GH cycle = %d, GH bytes = %d", | |
a69ed03c | 917 | tail_cycle, tail_bytes, head_cycle, head_bytes); |
1da177e4 LT |
918 | ASSERT(0); |
919 | free_bytes = log->l_logsize; | |
920 | } | |
921 | return free_bytes; | |
a69ed03c | 922 | } |
1da177e4 LT |
923 | |
924 | ||
925 | /* | |
926 | * Log function which is called when an io completes. | |
927 | * | |
928 | * The log manager needs its own routine, in order to control what | |
929 | * happens with the buffer after the write completes. | |
930 | */ | |
931 | void | |
932 | xlog_iodone(xfs_buf_t *bp) | |
933 | { | |
adadbeef CH |
934 | xlog_in_core_t *iclog = bp->b_fspriv; |
935 | xlog_t *l = iclog->ic_log; | |
936 | int aborted = 0; | |
1da177e4 LT |
937 | |
938 | /* | |
939 | * Race to shutdown the filesystem if we see an error. | |
940 | */ | |
5a52c2a5 | 941 | if (XFS_TEST_ERROR((xfs_buf_geterror(bp)), l->l_mp, |
1da177e4 | 942 | XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { |
901796af | 943 | xfs_buf_ioerror_alert(bp, __func__); |
c867cb61 | 944 | xfs_buf_stale(bp); |
7d04a335 | 945 | xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 LT |
946 | /* |
947 | * This flag will be propagated to the trans-committed | |
948 | * callback routines to let them know that the log-commit | |
949 | * didn't succeed. | |
950 | */ | |
951 | aborted = XFS_LI_ABORTED; | |
952 | } else if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
953 | aborted = XFS_LI_ABORTED; | |
954 | } | |
3db296f3 DC |
955 | |
956 | /* log I/O is always issued ASYNC */ | |
957 | ASSERT(XFS_BUF_ISASYNC(bp)); | |
1da177e4 | 958 | xlog_state_done_syncing(iclog, aborted); |
3db296f3 DC |
959 | /* |
960 | * do not reference the buffer (bp) here as we could race | |
961 | * with it being freed after writing the unmount record to the | |
962 | * log. | |
963 | */ | |
964 | ||
1da177e4 LT |
965 | } /* xlog_iodone */ |
966 | ||
1da177e4 LT |
967 | /* |
968 | * Return size of each in-core log record buffer. | |
969 | * | |
9da096fd | 970 | * All machines get 8 x 32kB buffers by default, unless tuned otherwise. |
1da177e4 LT |
971 | * |
972 | * If the filesystem blocksize is too large, we may need to choose a | |
973 | * larger size since the directory code currently logs entire blocks. | |
974 | */ | |
975 | ||
976 | STATIC void | |
977 | xlog_get_iclog_buffer_size(xfs_mount_t *mp, | |
978 | xlog_t *log) | |
979 | { | |
980 | int size; | |
981 | int xhdrs; | |
982 | ||
1cb51258 ES |
983 | if (mp->m_logbufs <= 0) |
984 | log->l_iclog_bufs = XLOG_MAX_ICLOGS; | |
985 | else | |
cfcbbbd0 | 986 | log->l_iclog_bufs = mp->m_logbufs; |
1da177e4 LT |
987 | |
988 | /* | |
989 | * Buffer size passed in from mount system call. | |
990 | */ | |
cfcbbbd0 | 991 | if (mp->m_logbsize > 0) { |
1da177e4 LT |
992 | size = log->l_iclog_size = mp->m_logbsize; |
993 | log->l_iclog_size_log = 0; | |
994 | while (size != 1) { | |
995 | log->l_iclog_size_log++; | |
996 | size >>= 1; | |
997 | } | |
998 | ||
62118709 | 999 | if (xfs_sb_version_haslogv2(&mp->m_sb)) { |
9da096fd MP |
1000 | /* # headers = size / 32k |
1001 | * one header holds cycles from 32k of data | |
1da177e4 LT |
1002 | */ |
1003 | ||
1004 | xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; | |
1005 | if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) | |
1006 | xhdrs++; | |
1007 | log->l_iclog_hsize = xhdrs << BBSHIFT; | |
1008 | log->l_iclog_heads = xhdrs; | |
1009 | } else { | |
1010 | ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); | |
1011 | log->l_iclog_hsize = BBSIZE; | |
1012 | log->l_iclog_heads = 1; | |
1013 | } | |
cfcbbbd0 | 1014 | goto done; |
1da177e4 LT |
1015 | } |
1016 | ||
9da096fd | 1017 | /* All machines use 32kB buffers by default. */ |
1cb51258 ES |
1018 | log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; |
1019 | log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; | |
1da177e4 LT |
1020 | |
1021 | /* the default log size is 16k or 32k which is one header sector */ | |
1022 | log->l_iclog_hsize = BBSIZE; | |
1023 | log->l_iclog_heads = 1; | |
1024 | ||
7153f8ba CH |
1025 | done: |
1026 | /* are we being asked to make the sizes selected above visible? */ | |
cfcbbbd0 NS |
1027 | if (mp->m_logbufs == 0) |
1028 | mp->m_logbufs = log->l_iclog_bufs; | |
1029 | if (mp->m_logbsize == 0) | |
1030 | mp->m_logbsize = log->l_iclog_size; | |
1da177e4 LT |
1031 | } /* xlog_get_iclog_buffer_size */ |
1032 | ||
1033 | ||
1034 | /* | |
1035 | * This routine initializes some of the log structure for a given mount point. | |
1036 | * Its primary purpose is to fill in enough, so recovery can occur. However, | |
1037 | * some other stuff may be filled in too. | |
1038 | */ | |
1039 | STATIC xlog_t * | |
1040 | xlog_alloc_log(xfs_mount_t *mp, | |
1041 | xfs_buftarg_t *log_target, | |
1042 | xfs_daddr_t blk_offset, | |
1043 | int num_bblks) | |
1044 | { | |
1045 | xlog_t *log; | |
1046 | xlog_rec_header_t *head; | |
1047 | xlog_in_core_t **iclogp; | |
1048 | xlog_in_core_t *iclog, *prev_iclog=NULL; | |
1049 | xfs_buf_t *bp; | |
1050 | int i; | |
a6cb767e | 1051 | int error = ENOMEM; |
69ce58f0 | 1052 | uint log2_size = 0; |
1da177e4 | 1053 | |
644c3567 | 1054 | log = kmem_zalloc(sizeof(xlog_t), KM_MAYFAIL); |
a6cb767e | 1055 | if (!log) { |
a0fa2b67 | 1056 | xfs_warn(mp, "Log allocation failed: No memory!"); |
a6cb767e DC |
1057 | goto out; |
1058 | } | |
1da177e4 LT |
1059 | |
1060 | log->l_mp = mp; | |
1061 | log->l_targ = log_target; | |
1062 | log->l_logsize = BBTOB(num_bblks); | |
1063 | log->l_logBBstart = blk_offset; | |
1064 | log->l_logBBsize = num_bblks; | |
1065 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1066 | log->l_flags |= XLOG_ACTIVE_RECOVERY; | |
1067 | ||
1068 | log->l_prev_block = -1; | |
1da177e4 | 1069 | /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ |
1c3cb9ec DC |
1070 | xlog_assign_atomic_lsn(&log->l_tail_lsn, 1, 0); |
1071 | xlog_assign_atomic_lsn(&log->l_last_sync_lsn, 1, 0); | |
1da177e4 | 1072 | log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ |
28496968 CH |
1073 | xlog_assign_grant_head(&log->l_reserve_head.grant, 1, 0); |
1074 | xlog_assign_grant_head(&log->l_write_head.grant, 1, 0); | |
1075 | INIT_LIST_HEAD(&log->l_reserve_head.waiters); | |
1076 | INIT_LIST_HEAD(&log->l_write_head.waiters); | |
1077 | spin_lock_init(&log->l_reserve_head.lock); | |
1078 | spin_lock_init(&log->l_write_head.lock); | |
1da177e4 | 1079 | |
a6cb767e | 1080 | error = EFSCORRUPTED; |
62118709 | 1081 | if (xfs_sb_version_hassector(&mp->m_sb)) { |
69ce58f0 AE |
1082 | log2_size = mp->m_sb.sb_logsectlog; |
1083 | if (log2_size < BBSHIFT) { | |
a0fa2b67 DC |
1084 | xfs_warn(mp, "Log sector size too small (0x%x < 0x%x)", |
1085 | log2_size, BBSHIFT); | |
a6cb767e DC |
1086 | goto out_free_log; |
1087 | } | |
1088 | ||
69ce58f0 AE |
1089 | log2_size -= BBSHIFT; |
1090 | if (log2_size > mp->m_sectbb_log) { | |
a0fa2b67 DC |
1091 | xfs_warn(mp, "Log sector size too large (0x%x > 0x%x)", |
1092 | log2_size, mp->m_sectbb_log); | |
a6cb767e DC |
1093 | goto out_free_log; |
1094 | } | |
69ce58f0 AE |
1095 | |
1096 | /* for larger sector sizes, must have v2 or external log */ | |
1097 | if (log2_size && log->l_logBBstart > 0 && | |
1098 | !xfs_sb_version_haslogv2(&mp->m_sb)) { | |
a0fa2b67 DC |
1099 | xfs_warn(mp, |
1100 | "log sector size (0x%x) invalid for configuration.", | |
1101 | log2_size); | |
a6cb767e DC |
1102 | goto out_free_log; |
1103 | } | |
1da177e4 | 1104 | } |
69ce58f0 | 1105 | log->l_sectBBsize = 1 << log2_size; |
1da177e4 LT |
1106 | |
1107 | xlog_get_iclog_buffer_size(mp, log); | |
1108 | ||
a6cb767e | 1109 | error = ENOMEM; |
4347b9d7 | 1110 | bp = xfs_buf_alloc(mp->m_logdev_targp, 0, log->l_iclog_size, 0); |
644c3567 DC |
1111 | if (!bp) |
1112 | goto out_free_log; | |
cb669ca5 | 1113 | bp->b_iodone = xlog_iodone; |
0c842ad4 | 1114 | ASSERT(xfs_buf_islocked(bp)); |
1da177e4 LT |
1115 | log->l_xbuf = bp; |
1116 | ||
007c61c6 | 1117 | spin_lock_init(&log->l_icloglock); |
eb40a875 | 1118 | init_waitqueue_head(&log->l_flush_wait); |
1da177e4 LT |
1119 | |
1120 | /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ | |
1121 | ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); | |
1122 | ||
1123 | iclogp = &log->l_iclog; | |
1124 | /* | |
1125 | * The amount of memory to allocate for the iclog structure is | |
1126 | * rather funky due to the way the structure is defined. It is | |
1127 | * done this way so that we can use different sizes for machines | |
1128 | * with different amounts of memory. See the definition of | |
1129 | * xlog_in_core_t in xfs_log_priv.h for details. | |
1130 | */ | |
1da177e4 LT |
1131 | ASSERT(log->l_iclog_size >= 4096); |
1132 | for (i=0; i < log->l_iclog_bufs; i++) { | |
644c3567 DC |
1133 | *iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL); |
1134 | if (!*iclogp) | |
1135 | goto out_free_iclog; | |
1136 | ||
1da177e4 | 1137 | iclog = *iclogp; |
1da177e4 LT |
1138 | iclog->ic_prev = prev_iclog; |
1139 | prev_iclog = iclog; | |
1fa40b01 | 1140 | |
686865f7 DC |
1141 | bp = xfs_buf_get_uncached(mp->m_logdev_targp, |
1142 | log->l_iclog_size, 0); | |
644c3567 DC |
1143 | if (!bp) |
1144 | goto out_free_iclog; | |
c8da0faf | 1145 | |
cb669ca5 | 1146 | bp->b_iodone = xlog_iodone; |
1fa40b01 | 1147 | iclog->ic_bp = bp; |
b28708d6 | 1148 | iclog->ic_data = bp->b_addr; |
4679b2d3 | 1149 | #ifdef DEBUG |
1da177e4 | 1150 | log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); |
4679b2d3 | 1151 | #endif |
1da177e4 LT |
1152 | head = &iclog->ic_header; |
1153 | memset(head, 0, sizeof(xlog_rec_header_t)); | |
b53e675d CH |
1154 | head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); |
1155 | head->h_version = cpu_to_be32( | |
62118709 | 1156 | xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); |
b53e675d | 1157 | head->h_size = cpu_to_be32(log->l_iclog_size); |
1da177e4 | 1158 | /* new fields */ |
b53e675d | 1159 | head->h_fmt = cpu_to_be32(XLOG_FMT); |
1da177e4 LT |
1160 | memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); |
1161 | ||
1da177e4 LT |
1162 | iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; |
1163 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
1164 | iclog->ic_log = log; | |
114d23aa DC |
1165 | atomic_set(&iclog->ic_refcnt, 0); |
1166 | spin_lock_init(&iclog->ic_callback_lock); | |
1da177e4 | 1167 | iclog->ic_callback_tail = &(iclog->ic_callback); |
b28708d6 | 1168 | iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; |
1da177e4 | 1169 | |
0c842ad4 | 1170 | ASSERT(xfs_buf_islocked(iclog->ic_bp)); |
eb40a875 DC |
1171 | init_waitqueue_head(&iclog->ic_force_wait); |
1172 | init_waitqueue_head(&iclog->ic_write_wait); | |
1da177e4 LT |
1173 | |
1174 | iclogp = &iclog->ic_next; | |
1175 | } | |
1176 | *iclogp = log->l_iclog; /* complete ring */ | |
1177 | log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ | |
1178 | ||
71e330b5 DC |
1179 | error = xlog_cil_init(log); |
1180 | if (error) | |
1181 | goto out_free_iclog; | |
1da177e4 | 1182 | return log; |
644c3567 DC |
1183 | |
1184 | out_free_iclog: | |
1185 | for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { | |
1186 | prev_iclog = iclog->ic_next; | |
eb40a875 | 1187 | if (iclog->ic_bp) |
644c3567 | 1188 | xfs_buf_free(iclog->ic_bp); |
644c3567 DC |
1189 | kmem_free(iclog); |
1190 | } | |
1191 | spinlock_destroy(&log->l_icloglock); | |
644c3567 DC |
1192 | xfs_buf_free(log->l_xbuf); |
1193 | out_free_log: | |
1194 | kmem_free(log); | |
a6cb767e DC |
1195 | out: |
1196 | return ERR_PTR(-error); | |
1da177e4 LT |
1197 | } /* xlog_alloc_log */ |
1198 | ||
1199 | ||
1200 | /* | |
1201 | * Write out the commit record of a transaction associated with the given | |
1202 | * ticket. Return the lsn of the commit record. | |
1203 | */ | |
1204 | STATIC int | |
55b66332 DC |
1205 | xlog_commit_record( |
1206 | struct log *log, | |
1207 | struct xlog_ticket *ticket, | |
1208 | struct xlog_in_core **iclog, | |
1209 | xfs_lsn_t *commitlsnp) | |
1da177e4 | 1210 | { |
55b66332 DC |
1211 | struct xfs_mount *mp = log->l_mp; |
1212 | int error; | |
1213 | struct xfs_log_iovec reg = { | |
1214 | .i_addr = NULL, | |
1215 | .i_len = 0, | |
1216 | .i_type = XLOG_REG_TYPE_COMMIT, | |
1217 | }; | |
1218 | struct xfs_log_vec vec = { | |
1219 | .lv_niovecs = 1, | |
1220 | .lv_iovecp = ®, | |
1221 | }; | |
1da177e4 LT |
1222 | |
1223 | ASSERT_ALWAYS(iclog); | |
55b66332 DC |
1224 | error = xlog_write(log, &vec, ticket, commitlsnp, iclog, |
1225 | XLOG_COMMIT_TRANS); | |
1226 | if (error) | |
7d04a335 | 1227 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 1228 | return error; |
55b66332 | 1229 | } |
1da177e4 LT |
1230 | |
1231 | /* | |
1232 | * Push on the buffer cache code if we ever use more than 75% of the on-disk | |
1233 | * log space. This code pushes on the lsn which would supposedly free up | |
1234 | * the 25% which we want to leave free. We may need to adopt a policy which | |
1235 | * pushes on an lsn which is further along in the log once we reach the high | |
1236 | * water mark. In this manner, we would be creating a low water mark. | |
1237 | */ | |
a8272ce0 | 1238 | STATIC void |
2ced19cb DC |
1239 | xlog_grant_push_ail( |
1240 | struct log *log, | |
1241 | int need_bytes) | |
1da177e4 | 1242 | { |
2ced19cb | 1243 | xfs_lsn_t threshold_lsn = 0; |
84f3c683 | 1244 | xfs_lsn_t last_sync_lsn; |
2ced19cb DC |
1245 | int free_blocks; |
1246 | int free_bytes; | |
1247 | int threshold_block; | |
1248 | int threshold_cycle; | |
1249 | int free_threshold; | |
1250 | ||
1251 | ASSERT(BTOBB(need_bytes) < log->l_logBBsize); | |
1252 | ||
28496968 | 1253 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); |
2ced19cb DC |
1254 | free_blocks = BTOBBT(free_bytes); |
1255 | ||
1256 | /* | |
1257 | * Set the threshold for the minimum number of free blocks in the | |
1258 | * log to the maximum of what the caller needs, one quarter of the | |
1259 | * log, and 256 blocks. | |
1260 | */ | |
1261 | free_threshold = BTOBB(need_bytes); | |
1262 | free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); | |
1263 | free_threshold = MAX(free_threshold, 256); | |
1264 | if (free_blocks >= free_threshold) | |
1265 | return; | |
1266 | ||
1c3cb9ec DC |
1267 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &threshold_cycle, |
1268 | &threshold_block); | |
1269 | threshold_block += free_threshold; | |
1da177e4 | 1270 | if (threshold_block >= log->l_logBBsize) { |
2ced19cb DC |
1271 | threshold_block -= log->l_logBBsize; |
1272 | threshold_cycle += 1; | |
1da177e4 | 1273 | } |
2ced19cb DC |
1274 | threshold_lsn = xlog_assign_lsn(threshold_cycle, |
1275 | threshold_block); | |
1276 | /* | |
1277 | * Don't pass in an lsn greater than the lsn of the last | |
84f3c683 DC |
1278 | * log record known to be on disk. Use a snapshot of the last sync lsn |
1279 | * so that it doesn't change between the compare and the set. | |
1da177e4 | 1280 | */ |
84f3c683 DC |
1281 | last_sync_lsn = atomic64_read(&log->l_last_sync_lsn); |
1282 | if (XFS_LSN_CMP(threshold_lsn, last_sync_lsn) > 0) | |
1283 | threshold_lsn = last_sync_lsn; | |
2ced19cb DC |
1284 | |
1285 | /* | |
1286 | * Get the transaction layer to kick the dirty buffers out to | |
1287 | * disk asynchronously. No point in trying to do this if | |
1288 | * the filesystem is shutting down. | |
1289 | */ | |
1290 | if (!XLOG_FORCED_SHUTDOWN(log)) | |
fd074841 | 1291 | xfs_ail_push(log->l_ailp, threshold_lsn); |
2ced19cb | 1292 | } |
1da177e4 | 1293 | |
873ff550 CH |
1294 | /* |
1295 | * The bdstrat callback function for log bufs. This gives us a central | |
1296 | * place to trap bufs in case we get hit by a log I/O error and need to | |
1297 | * shutdown. Actually, in practice, even when we didn't get a log error, | |
1298 | * we transition the iclogs to IOERROR state *after* flushing all existing | |
1299 | * iclogs to disk. This is because we don't want anymore new transactions to be | |
1300 | * started or completed afterwards. | |
1301 | */ | |
1302 | STATIC int | |
1303 | xlog_bdstrat( | |
1304 | struct xfs_buf *bp) | |
1305 | { | |
adadbeef | 1306 | struct xlog_in_core *iclog = bp->b_fspriv; |
873ff550 | 1307 | |
873ff550 | 1308 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
5a52c2a5 | 1309 | xfs_buf_ioerror(bp, EIO); |
c867cb61 | 1310 | xfs_buf_stale(bp); |
1a1a3e97 | 1311 | xfs_buf_ioend(bp, 0); |
873ff550 CH |
1312 | /* |
1313 | * It would seem logical to return EIO here, but we rely on | |
1314 | * the log state machine to propagate I/O errors instead of | |
1315 | * doing it here. | |
1316 | */ | |
1317 | return 0; | |
1318 | } | |
1319 | ||
873ff550 CH |
1320 | xfs_buf_iorequest(bp); |
1321 | return 0; | |
1322 | } | |
1da177e4 LT |
1323 | |
1324 | /* | |
1325 | * Flush out the in-core log (iclog) to the on-disk log in an asynchronous | |
1326 | * fashion. Previously, we should have moved the current iclog | |
1327 | * ptr in the log to point to the next available iclog. This allows further | |
1328 | * write to continue while this code syncs out an iclog ready to go. | |
1329 | * Before an in-core log can be written out, the data section must be scanned | |
1330 | * to save away the 1st word of each BBSIZE block into the header. We replace | |
1331 | * it with the current cycle count. Each BBSIZE block is tagged with the | |
1332 | * cycle count because there in an implicit assumption that drives will | |
1333 | * guarantee that entire 512 byte blocks get written at once. In other words, | |
1334 | * we can't have part of a 512 byte block written and part not written. By | |
1335 | * tagging each block, we will know which blocks are valid when recovering | |
1336 | * after an unclean shutdown. | |
1337 | * | |
1338 | * This routine is single threaded on the iclog. No other thread can be in | |
1339 | * this routine with the same iclog. Changing contents of iclog can there- | |
1340 | * fore be done without grabbing the state machine lock. Updating the global | |
1341 | * log will require grabbing the lock though. | |
1342 | * | |
1343 | * The entire log manager uses a logical block numbering scheme. Only | |
1344 | * log_sync (and then only bwrite()) know about the fact that the log may | |
1345 | * not start with block zero on a given device. The log block start offset | |
1346 | * is added immediately before calling bwrite(). | |
1347 | */ | |
1348 | ||
a8272ce0 | 1349 | STATIC int |
1da177e4 LT |
1350 | xlog_sync(xlog_t *log, |
1351 | xlog_in_core_t *iclog) | |
1352 | { | |
1353 | xfs_caddr_t dptr; /* pointer to byte sized element */ | |
1354 | xfs_buf_t *bp; | |
b53e675d | 1355 | int i; |
1da177e4 LT |
1356 | uint count; /* byte count of bwrite */ |
1357 | uint count_init; /* initial count before roundup */ | |
1358 | int roundoff; /* roundoff to BB or stripe */ | |
1359 | int split = 0; /* split write into two regions */ | |
1360 | int error; | |
62118709 | 1361 | int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb); |
1da177e4 LT |
1362 | |
1363 | XFS_STATS_INC(xs_log_writes); | |
155cc6b7 | 1364 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
1365 | |
1366 | /* Add for LR header */ | |
1367 | count_init = log->l_iclog_hsize + iclog->ic_offset; | |
1368 | ||
1369 | /* Round out the log write size */ | |
1370 | if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { | |
1371 | /* we have a v2 stripe unit to use */ | |
1372 | count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); | |
1373 | } else { | |
1374 | count = BBTOB(BTOBB(count_init)); | |
1375 | } | |
1376 | roundoff = count - count_init; | |
1377 | ASSERT(roundoff >= 0); | |
1378 | ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && | |
1379 | roundoff < log->l_mp->m_sb.sb_logsunit) | |
1380 | || | |
1381 | (log->l_mp->m_sb.sb_logsunit <= 1 && | |
1382 | roundoff < BBTOB(1))); | |
1383 | ||
1384 | /* move grant heads by roundoff in sync */ | |
28496968 CH |
1385 | xlog_grant_add_space(log, &log->l_reserve_head.grant, roundoff); |
1386 | xlog_grant_add_space(log, &log->l_write_head.grant, roundoff); | |
1da177e4 LT |
1387 | |
1388 | /* put cycle number in every block */ | |
1389 | xlog_pack_data(log, iclog, roundoff); | |
1390 | ||
1391 | /* real byte length */ | |
1392 | if (v2) { | |
b53e675d CH |
1393 | iclog->ic_header.h_len = |
1394 | cpu_to_be32(iclog->ic_offset + roundoff); | |
1da177e4 | 1395 | } else { |
b53e675d CH |
1396 | iclog->ic_header.h_len = |
1397 | cpu_to_be32(iclog->ic_offset); | |
1da177e4 LT |
1398 | } |
1399 | ||
f5faad79 | 1400 | bp = iclog->ic_bp; |
b53e675d | 1401 | XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn))); |
1da177e4 LT |
1402 | |
1403 | XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); | |
1404 | ||
1405 | /* Do we need to split this write into 2 parts? */ | |
1406 | if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { | |
1407 | split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); | |
1408 | count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); | |
1409 | iclog->ic_bwritecnt = 2; /* split into 2 writes */ | |
1410 | } else { | |
1411 | iclog->ic_bwritecnt = 1; | |
1412 | } | |
511105b3 | 1413 | XFS_BUF_SET_COUNT(bp, count); |
adadbeef | 1414 | bp->b_fspriv = iclog; |
f5faad79 | 1415 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 | 1416 | XFS_BUF_ASYNC(bp); |
1d5ae5df | 1417 | bp->b_flags |= XBF_SYNCIO; |
651701d7 | 1418 | |
a27a263b | 1419 | if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) { |
e163cbde CH |
1420 | bp->b_flags |= XBF_FUA; |
1421 | ||
a27a263b | 1422 | /* |
e163cbde CH |
1423 | * Flush the data device before flushing the log to make |
1424 | * sure all meta data written back from the AIL actually made | |
1425 | * it to disk before stamping the new log tail LSN into the | |
1426 | * log buffer. For an external log we need to issue the | |
1427 | * flush explicitly, and unfortunately synchronously here; | |
1428 | * for an internal log we can simply use the block layer | |
1429 | * state machine for preflushes. | |
a27a263b CH |
1430 | */ |
1431 | if (log->l_mp->m_logdev_targp != log->l_mp->m_ddev_targp) | |
1432 | xfs_blkdev_issue_flush(log->l_mp->m_ddev_targp); | |
e163cbde CH |
1433 | else |
1434 | bp->b_flags |= XBF_FLUSH; | |
a27a263b | 1435 | } |
1da177e4 LT |
1436 | |
1437 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1438 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1439 | ||
1440 | xlog_verify_iclog(log, iclog, count, B_TRUE); | |
1441 | ||
1442 | /* account for log which doesn't start at block #0 */ | |
1443 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); | |
1444 | /* | |
1445 | * Don't call xfs_bwrite here. We do log-syncs even when the filesystem | |
1446 | * is shutting down. | |
1447 | */ | |
1448 | XFS_BUF_WRITE(bp); | |
1449 | ||
901796af CH |
1450 | error = xlog_bdstrat(bp); |
1451 | if (error) { | |
1452 | xfs_buf_ioerror_alert(bp, "xlog_sync"); | |
014c2544 | 1453 | return error; |
1da177e4 LT |
1454 | } |
1455 | if (split) { | |
f5faad79 | 1456 | bp = iclog->ic_log->l_xbuf; |
1da177e4 | 1457 | XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ |
02fe03d9 CS |
1458 | xfs_buf_associate_memory(bp, |
1459 | (char *)&iclog->ic_header + count, split); | |
adadbeef | 1460 | bp->b_fspriv = iclog; |
f5faad79 | 1461 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 | 1462 | XFS_BUF_ASYNC(bp); |
1d5ae5df | 1463 | bp->b_flags |= XBF_SYNCIO; |
f538d4da | 1464 | if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) |
e163cbde | 1465 | bp->b_flags |= XBF_FUA; |
62926044 | 1466 | dptr = bp->b_addr; |
1da177e4 LT |
1467 | /* |
1468 | * Bump the cycle numbers at the start of each block | |
1469 | * since this part of the buffer is at the start of | |
1470 | * a new cycle. Watch out for the header magic number | |
1471 | * case, though. | |
1472 | */ | |
b53e675d | 1473 | for (i = 0; i < split; i += BBSIZE) { |
413d57c9 | 1474 | be32_add_cpu((__be32 *)dptr, 1); |
b53e675d | 1475 | if (be32_to_cpu(*(__be32 *)dptr) == XLOG_HEADER_MAGIC_NUM) |
413d57c9 | 1476 | be32_add_cpu((__be32 *)dptr, 1); |
1da177e4 LT |
1477 | dptr += BBSIZE; |
1478 | } | |
1479 | ||
1480 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1481 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1482 | ||
c41564b5 | 1483 | /* account for internal log which doesn't start at block #0 */ |
1da177e4 LT |
1484 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); |
1485 | XFS_BUF_WRITE(bp); | |
901796af CH |
1486 | error = xlog_bdstrat(bp); |
1487 | if (error) { | |
1488 | xfs_buf_ioerror_alert(bp, "xlog_sync (split)"); | |
014c2544 | 1489 | return error; |
1da177e4 LT |
1490 | } |
1491 | } | |
014c2544 | 1492 | return 0; |
1da177e4 LT |
1493 | } /* xlog_sync */ |
1494 | ||
1495 | ||
1496 | /* | |
c41564b5 | 1497 | * Deallocate a log structure |
1da177e4 | 1498 | */ |
a8272ce0 | 1499 | STATIC void |
c41564b5 | 1500 | xlog_dealloc_log(xlog_t *log) |
1da177e4 LT |
1501 | { |
1502 | xlog_in_core_t *iclog, *next_iclog; | |
1da177e4 LT |
1503 | int i; |
1504 | ||
71e330b5 DC |
1505 | xlog_cil_destroy(log); |
1506 | ||
44396476 DC |
1507 | /* |
1508 | * always need to ensure that the extra buffer does not point to memory | |
1509 | * owned by another log buffer before we free it. | |
1510 | */ | |
1511 | xfs_buf_set_empty(log->l_xbuf, log->l_iclog_size); | |
1512 | xfs_buf_free(log->l_xbuf); | |
1513 | ||
1da177e4 LT |
1514 | iclog = log->l_iclog; |
1515 | for (i=0; i<log->l_iclog_bufs; i++) { | |
1da177e4 | 1516 | xfs_buf_free(iclog->ic_bp); |
1da177e4 | 1517 | next_iclog = iclog->ic_next; |
f0e2d93c | 1518 | kmem_free(iclog); |
1da177e4 LT |
1519 | iclog = next_iclog; |
1520 | } | |
1da177e4 | 1521 | spinlock_destroy(&log->l_icloglock); |
1da177e4 | 1522 | |
1da177e4 | 1523 | log->l_mp->m_log = NULL; |
f0e2d93c | 1524 | kmem_free(log); |
c41564b5 | 1525 | } /* xlog_dealloc_log */ |
1da177e4 LT |
1526 | |
1527 | /* | |
1528 | * Update counters atomically now that memcpy is done. | |
1529 | */ | |
1530 | /* ARGSUSED */ | |
1531 | static inline void | |
1532 | xlog_state_finish_copy(xlog_t *log, | |
1533 | xlog_in_core_t *iclog, | |
1534 | int record_cnt, | |
1535 | int copy_bytes) | |
1536 | { | |
b22cd72c | 1537 | spin_lock(&log->l_icloglock); |
1da177e4 | 1538 | |
413d57c9 | 1539 | be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); |
1da177e4 LT |
1540 | iclog->ic_offset += copy_bytes; |
1541 | ||
b22cd72c | 1542 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
1543 | } /* xlog_state_finish_copy */ |
1544 | ||
1545 | ||
1546 | ||
1547 | ||
7e9c6396 TS |
1548 | /* |
1549 | * print out info relating to regions written which consume | |
1550 | * the reservation | |
1551 | */ | |
71e330b5 DC |
1552 | void |
1553 | xlog_print_tic_res( | |
1554 | struct xfs_mount *mp, | |
1555 | struct xlog_ticket *ticket) | |
7e9c6396 TS |
1556 | { |
1557 | uint i; | |
1558 | uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); | |
1559 | ||
1560 | /* match with XLOG_REG_TYPE_* in xfs_log.h */ | |
1561 | static char *res_type_str[XLOG_REG_TYPE_MAX] = { | |
1562 | "bformat", | |
1563 | "bchunk", | |
1564 | "efi_format", | |
1565 | "efd_format", | |
1566 | "iformat", | |
1567 | "icore", | |
1568 | "iext", | |
1569 | "ibroot", | |
1570 | "ilocal", | |
1571 | "iattr_ext", | |
1572 | "iattr_broot", | |
1573 | "iattr_local", | |
1574 | "qformat", | |
1575 | "dquot", | |
1576 | "quotaoff", | |
1577 | "LR header", | |
1578 | "unmount", | |
1579 | "commit", | |
1580 | "trans header" | |
1581 | }; | |
1582 | static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { | |
1583 | "SETATTR_NOT_SIZE", | |
1584 | "SETATTR_SIZE", | |
1585 | "INACTIVE", | |
1586 | "CREATE", | |
1587 | "CREATE_TRUNC", | |
1588 | "TRUNCATE_FILE", | |
1589 | "REMOVE", | |
1590 | "LINK", | |
1591 | "RENAME", | |
1592 | "MKDIR", | |
1593 | "RMDIR", | |
1594 | "SYMLINK", | |
1595 | "SET_DMATTRS", | |
1596 | "GROWFS", | |
1597 | "STRAT_WRITE", | |
1598 | "DIOSTRAT", | |
1599 | "WRITE_SYNC", | |
1600 | "WRITEID", | |
1601 | "ADDAFORK", | |
1602 | "ATTRINVAL", | |
1603 | "ATRUNCATE", | |
1604 | "ATTR_SET", | |
1605 | "ATTR_RM", | |
1606 | "ATTR_FLAG", | |
1607 | "CLEAR_AGI_BUCKET", | |
1608 | "QM_SBCHANGE", | |
1609 | "DUMMY1", | |
1610 | "DUMMY2", | |
1611 | "QM_QUOTAOFF", | |
1612 | "QM_DQALLOC", | |
1613 | "QM_SETQLIM", | |
1614 | "QM_DQCLUSTER", | |
1615 | "QM_QINOCREATE", | |
1616 | "QM_QUOTAOFF_END", | |
1617 | "SB_UNIT", | |
1618 | "FSYNC_TS", | |
1619 | "GROWFSRT_ALLOC", | |
1620 | "GROWFSRT_ZERO", | |
1621 | "GROWFSRT_FREE", | |
1622 | "SWAPEXT" | |
1623 | }; | |
1624 | ||
a0fa2b67 | 1625 | xfs_warn(mp, |
93b8a585 | 1626 | "xlog_write: reservation summary:\n" |
a0fa2b67 DC |
1627 | " trans type = %s (%u)\n" |
1628 | " unit res = %d bytes\n" | |
1629 | " current res = %d bytes\n" | |
1630 | " total reg = %u bytes (o/flow = %u bytes)\n" | |
1631 | " ophdrs = %u (ophdr space = %u bytes)\n" | |
1632 | " ophdr + reg = %u bytes\n" | |
1633 | " num regions = %u\n", | |
1634 | ((ticket->t_trans_type <= 0 || | |
1635 | ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? | |
1636 | "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), | |
1637 | ticket->t_trans_type, | |
1638 | ticket->t_unit_res, | |
1639 | ticket->t_curr_res, | |
1640 | ticket->t_res_arr_sum, ticket->t_res_o_flow, | |
1641 | ticket->t_res_num_ophdrs, ophdr_spc, | |
1642 | ticket->t_res_arr_sum + | |
1643 | ticket->t_res_o_flow + ophdr_spc, | |
1644 | ticket->t_res_num); | |
7e9c6396 TS |
1645 | |
1646 | for (i = 0; i < ticket->t_res_num; i++) { | |
a0fa2b67 DC |
1647 | uint r_type = ticket->t_res_arr[i].r_type; |
1648 | xfs_warn(mp, "region[%u]: %s - %u bytes\n", i, | |
7e9c6396 TS |
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 | 1653 | |
a0fa2b67 | 1654 | xfs_alert_tag(mp, XFS_PTAG_LOGRES, |
93b8a585 | 1655 | "xlog_write: reservation ran out. Need to up reservation"); |
169a7b07 | 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: | |
a0fa2b67 | 1742 | xfs_warn(log->l_mp, |
b5203cd0 DC |
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 | 1909 | |
93b8a585 CH |
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); | |
71e330b5 DC |
1924 | |
1925 | if (ticket->t_curr_res < 0) | |
55b66332 | 1926 | xlog_print_tic_res(log->l_mp, ticket); |
1da177e4 | 1927 | |
55b66332 DC |
1928 | index = 0; |
1929 | lv = log_vector; | |
1930 | vecp = lv->lv_iovecp; | |
1931 | while (lv && index < lv->lv_niovecs) { | |
e6b1f273 | 1932 | void *ptr; |
99428ad0 | 1933 | int log_offset; |
1da177e4 | 1934 | |
99428ad0 CH |
1935 | error = xlog_state_get_iclog_space(log, len, &iclog, ticket, |
1936 | &contwr, &log_offset); | |
1937 | if (error) | |
1938 | return error; | |
1da177e4 | 1939 | |
99428ad0 | 1940 | ASSERT(log_offset <= iclog->ic_size - 1); |
e6b1f273 | 1941 | ptr = iclog->ic_datap + log_offset; |
1da177e4 | 1942 | |
99428ad0 CH |
1943 | /* start_lsn is the first lsn written to. That's all we need. */ |
1944 | if (!*start_lsn) | |
1945 | *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); | |
b5203cd0 | 1946 | |
99428ad0 CH |
1947 | /* |
1948 | * This loop writes out as many regions as can fit in the amount | |
1949 | * of space which was allocated by xlog_state_get_iclog_space(). | |
1950 | */ | |
55b66332 DC |
1951 | while (lv && index < lv->lv_niovecs) { |
1952 | struct xfs_log_iovec *reg = &vecp[index]; | |
99428ad0 CH |
1953 | struct xlog_op_header *ophdr; |
1954 | int start_rec_copy; | |
1955 | int copy_len; | |
1956 | int copy_off; | |
1957 | ||
55b66332 | 1958 | ASSERT(reg->i_len % sizeof(__int32_t) == 0); |
e6b1f273 | 1959 | ASSERT((unsigned long)ptr % sizeof(__int32_t) == 0); |
99428ad0 CH |
1960 | |
1961 | start_rec_copy = xlog_write_start_rec(ptr, ticket); | |
1962 | if (start_rec_copy) { | |
1963 | record_cnt++; | |
e6b1f273 | 1964 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
1965 | start_rec_copy); |
1966 | } | |
b5203cd0 | 1967 | |
99428ad0 CH |
1968 | ophdr = xlog_write_setup_ophdr(log, ptr, ticket, flags); |
1969 | if (!ophdr) | |
1970 | return XFS_ERROR(EIO); | |
1971 | ||
e6b1f273 | 1972 | xlog_write_adv_cnt(&ptr, &len, &log_offset, |
99428ad0 CH |
1973 | sizeof(struct xlog_op_header)); |
1974 | ||
1975 | len += xlog_write_setup_copy(ticket, ophdr, | |
1976 | iclog->ic_size-log_offset, | |
55b66332 | 1977 | reg->i_len, |
99428ad0 CH |
1978 | ©_off, ©_len, |
1979 | &partial_copy, | |
1980 | &partial_copy_len); | |
1981 | xlog_verify_dest_ptr(log, ptr); | |
1982 | ||
1983 | /* copy region */ | |
1984 | ASSERT(copy_len >= 0); | |
e6b1f273 CH |
1985 | memcpy(ptr, reg->i_addr + copy_off, copy_len); |
1986 | xlog_write_adv_cnt(&ptr, &len, &log_offset, copy_len); | |
99428ad0 CH |
1987 | |
1988 | copy_len += start_rec_copy + sizeof(xlog_op_header_t); | |
1989 | record_cnt++; | |
1990 | data_cnt += contwr ? copy_len : 0; | |
1991 | ||
1992 | error = xlog_write_copy_finish(log, iclog, flags, | |
1993 | &record_cnt, &data_cnt, | |
1994 | &partial_copy, | |
1995 | &partial_copy_len, | |
1996 | log_offset, | |
1997 | commit_iclog); | |
1998 | if (error) | |
1999 | return error; | |
2000 | ||
2001 | /* | |
2002 | * if we had a partial copy, we need to get more iclog | |
2003 | * space but we don't want to increment the region | |
2004 | * index because there is still more is this region to | |
2005 | * write. | |
2006 | * | |
2007 | * If we completed writing this region, and we flushed | |
2008 | * the iclog (indicated by resetting of the record | |
2009 | * count), then we also need to get more log space. If | |
2010 | * this was the last record, though, we are done and | |
2011 | * can just return. | |
2012 | */ | |
2013 | if (partial_copy) | |
2014 | break; | |
2015 | ||
55b66332 DC |
2016 | if (++index == lv->lv_niovecs) { |
2017 | lv = lv->lv_next; | |
2018 | index = 0; | |
2019 | if (lv) | |
2020 | vecp = lv->lv_iovecp; | |
2021 | } | |
99428ad0 | 2022 | if (record_cnt == 0) { |
55b66332 | 2023 | if (!lv) |
99428ad0 CH |
2024 | return 0; |
2025 | break; | |
2026 | } | |
2027 | } | |
2028 | } | |
2029 | ||
2030 | ASSERT(len == 0); | |
2031 | ||
2032 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
2033 | if (!commit_iclog) | |
2034 | return xlog_state_release_iclog(log, iclog); | |
1da177e4 | 2035 | |
1da177e4 LT |
2036 | ASSERT(flags & XLOG_COMMIT_TRANS); |
2037 | *commit_iclog = iclog; | |
2038 | return 0; | |
99428ad0 | 2039 | } |
1da177e4 LT |
2040 | |
2041 | ||
2042 | /***************************************************************************** | |
2043 | * | |
2044 | * State Machine functions | |
2045 | * | |
2046 | ***************************************************************************** | |
2047 | */ | |
2048 | ||
2049 | /* Clean iclogs starting from the head. This ordering must be | |
2050 | * maintained, so an iclog doesn't become ACTIVE beyond one that | |
2051 | * is SYNCING. This is also required to maintain the notion that we use | |
12017faf | 2052 | * a ordered wait queue to hold off would be writers to the log when every |
1da177e4 LT |
2053 | * iclog is trying to sync to disk. |
2054 | * | |
2055 | * State Change: DIRTY -> ACTIVE | |
2056 | */ | |
ba0f32d4 | 2057 | STATIC void |
1da177e4 LT |
2058 | xlog_state_clean_log(xlog_t *log) |
2059 | { | |
2060 | xlog_in_core_t *iclog; | |
2061 | int changed = 0; | |
2062 | ||
2063 | iclog = log->l_iclog; | |
2064 | do { | |
2065 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
2066 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
2067 | iclog->ic_offset = 0; | |
114d23aa | 2068 | ASSERT(iclog->ic_callback == NULL); |
1da177e4 LT |
2069 | /* |
2070 | * If the number of ops in this iclog indicate it just | |
2071 | * contains the dummy transaction, we can | |
2072 | * change state into IDLE (the second time around). | |
2073 | * Otherwise we should change the state into | |
2074 | * NEED a dummy. | |
2075 | * We don't need to cover the dummy. | |
2076 | */ | |
2077 | if (!changed && | |
b53e675d CH |
2078 | (be32_to_cpu(iclog->ic_header.h_num_logops) == |
2079 | XLOG_COVER_OPS)) { | |
1da177e4 LT |
2080 | changed = 1; |
2081 | } else { | |
2082 | /* | |
2083 | * We have two dirty iclogs so start over | |
2084 | * This could also be num of ops indicates | |
2085 | * this is not the dummy going out. | |
2086 | */ | |
2087 | changed = 2; | |
2088 | } | |
2089 | iclog->ic_header.h_num_logops = 0; | |
2090 | memset(iclog->ic_header.h_cycle_data, 0, | |
2091 | sizeof(iclog->ic_header.h_cycle_data)); | |
2092 | iclog->ic_header.h_lsn = 0; | |
2093 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) | |
2094 | /* do nothing */; | |
2095 | else | |
2096 | break; /* stop cleaning */ | |
2097 | iclog = iclog->ic_next; | |
2098 | } while (iclog != log->l_iclog); | |
2099 | ||
2100 | /* log is locked when we are called */ | |
2101 | /* | |
2102 | * Change state for the dummy log recording. | |
2103 | * We usually go to NEED. But we go to NEED2 if the changed indicates | |
2104 | * we are done writing the dummy record. | |
2105 | * If we are done with the second dummy recored (DONE2), then | |
2106 | * we go to IDLE. | |
2107 | */ | |
2108 | if (changed) { | |
2109 | switch (log->l_covered_state) { | |
2110 | case XLOG_STATE_COVER_IDLE: | |
2111 | case XLOG_STATE_COVER_NEED: | |
2112 | case XLOG_STATE_COVER_NEED2: | |
2113 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2114 | break; | |
2115 | ||
2116 | case XLOG_STATE_COVER_DONE: | |
2117 | if (changed == 1) | |
2118 | log->l_covered_state = XLOG_STATE_COVER_NEED2; | |
2119 | else | |
2120 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2121 | break; | |
2122 | ||
2123 | case XLOG_STATE_COVER_DONE2: | |
2124 | if (changed == 1) | |
2125 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
2126 | else | |
2127 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2128 | break; | |
2129 | ||
2130 | default: | |
2131 | ASSERT(0); | |
2132 | } | |
2133 | } | |
2134 | } /* xlog_state_clean_log */ | |
2135 | ||
2136 | STATIC xfs_lsn_t | |
2137 | xlog_get_lowest_lsn( | |
2138 | xlog_t *log) | |
2139 | { | |
2140 | xlog_in_core_t *lsn_log; | |
2141 | xfs_lsn_t lowest_lsn, lsn; | |
2142 | ||
2143 | lsn_log = log->l_iclog; | |
2144 | lowest_lsn = 0; | |
2145 | do { | |
2146 | if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { | |
b53e675d | 2147 | lsn = be64_to_cpu(lsn_log->ic_header.h_lsn); |
1da177e4 LT |
2148 | if ((lsn && !lowest_lsn) || |
2149 | (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { | |
2150 | lowest_lsn = lsn; | |
2151 | } | |
2152 | } | |
2153 | lsn_log = lsn_log->ic_next; | |
2154 | } while (lsn_log != log->l_iclog); | |
014c2544 | 2155 | return lowest_lsn; |
1da177e4 LT |
2156 | } |
2157 | ||
2158 | ||
2159 | STATIC void | |
2160 | xlog_state_do_callback( | |
2161 | xlog_t *log, | |
2162 | int aborted, | |
2163 | xlog_in_core_t *ciclog) | |
2164 | { | |
2165 | xlog_in_core_t *iclog; | |
2166 | xlog_in_core_t *first_iclog; /* used to know when we've | |
2167 | * processed all iclogs once */ | |
2168 | xfs_log_callback_t *cb, *cb_next; | |
2169 | int flushcnt = 0; | |
2170 | xfs_lsn_t lowest_lsn; | |
2171 | int ioerrors; /* counter: iclogs with errors */ | |
2172 | int loopdidcallbacks; /* flag: inner loop did callbacks*/ | |
2173 | int funcdidcallbacks; /* flag: function did callbacks */ | |
2174 | int repeats; /* for issuing console warnings if | |
2175 | * looping too many times */ | |
d748c623 | 2176 | int wake = 0; |
1da177e4 | 2177 | |
b22cd72c | 2178 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2179 | first_iclog = iclog = log->l_iclog; |
2180 | ioerrors = 0; | |
2181 | funcdidcallbacks = 0; | |
2182 | repeats = 0; | |
2183 | ||
2184 | do { | |
2185 | /* | |
2186 | * Scan all iclogs starting with the one pointed to by the | |
2187 | * log. Reset this starting point each time the log is | |
2188 | * unlocked (during callbacks). | |
2189 | * | |
2190 | * Keep looping through iclogs until one full pass is made | |
2191 | * without running any callbacks. | |
2192 | */ | |
2193 | first_iclog = log->l_iclog; | |
2194 | iclog = log->l_iclog; | |
2195 | loopdidcallbacks = 0; | |
2196 | repeats++; | |
2197 | ||
2198 | do { | |
2199 | ||
2200 | /* skip all iclogs in the ACTIVE & DIRTY states */ | |
2201 | if (iclog->ic_state & | |
2202 | (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { | |
2203 | iclog = iclog->ic_next; | |
2204 | continue; | |
2205 | } | |
2206 | ||
2207 | /* | |
2208 | * Between marking a filesystem SHUTDOWN and stopping | |
2209 | * the log, we do flush all iclogs to disk (if there | |
2210 | * wasn't a log I/O error). So, we do want things to | |
2211 | * go smoothly in case of just a SHUTDOWN w/o a | |
2212 | * LOG_IO_ERROR. | |
2213 | */ | |
2214 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
2215 | /* | |
2216 | * Can only perform callbacks in order. Since | |
2217 | * this iclog is not in the DONE_SYNC/ | |
2218 | * DO_CALLBACK state, we skip the rest and | |
2219 | * just try to clean up. If we set our iclog | |
2220 | * to DO_CALLBACK, we will not process it when | |
2221 | * we retry since a previous iclog is in the | |
2222 | * CALLBACK and the state cannot change since | |
b22cd72c | 2223 | * we are holding the l_icloglock. |
1da177e4 LT |
2224 | */ |
2225 | if (!(iclog->ic_state & | |
2226 | (XLOG_STATE_DONE_SYNC | | |
2227 | XLOG_STATE_DO_CALLBACK))) { | |
2228 | if (ciclog && (ciclog->ic_state == | |
2229 | XLOG_STATE_DONE_SYNC)) { | |
2230 | ciclog->ic_state = XLOG_STATE_DO_CALLBACK; | |
2231 | } | |
2232 | break; | |
2233 | } | |
2234 | /* | |
2235 | * We now have an iclog that is in either the | |
2236 | * DO_CALLBACK or DONE_SYNC states. The other | |
2237 | * states (WANT_SYNC, SYNCING, or CALLBACK were | |
2238 | * caught by the above if and are going to | |
2239 | * clean (i.e. we aren't doing their callbacks) | |
2240 | * see the above if. | |
2241 | */ | |
2242 | ||
2243 | /* | |
2244 | * We will do one more check here to see if we | |
2245 | * have chased our tail around. | |
2246 | */ | |
2247 | ||
2248 | lowest_lsn = xlog_get_lowest_lsn(log); | |
b53e675d CH |
2249 | if (lowest_lsn && |
2250 | XFS_LSN_CMP(lowest_lsn, | |
84f3c683 | 2251 | be64_to_cpu(iclog->ic_header.h_lsn)) < 0) { |
1da177e4 LT |
2252 | iclog = iclog->ic_next; |
2253 | continue; /* Leave this iclog for | |
2254 | * another thread */ | |
2255 | } | |
2256 | ||
2257 | iclog->ic_state = XLOG_STATE_CALLBACK; | |
2258 | ||
1da177e4 | 2259 | |
84f3c683 DC |
2260 | /* |
2261 | * update the last_sync_lsn before we drop the | |
2262 | * icloglock to ensure we are the only one that | |
2263 | * can update it. | |
1da177e4 | 2264 | */ |
84f3c683 DC |
2265 | ASSERT(XFS_LSN_CMP(atomic64_read(&log->l_last_sync_lsn), |
2266 | be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); | |
2267 | atomic64_set(&log->l_last_sync_lsn, | |
2268 | be64_to_cpu(iclog->ic_header.h_lsn)); | |
1da177e4 | 2269 | |
84f3c683 | 2270 | } else |
1da177e4 | 2271 | ioerrors++; |
84f3c683 DC |
2272 | |
2273 | spin_unlock(&log->l_icloglock); | |
1da177e4 | 2274 | |
114d23aa DC |
2275 | /* |
2276 | * Keep processing entries in the callback list until | |
2277 | * we come around and it is empty. We need to | |
2278 | * atomically see that the list is empty and change the | |
2279 | * state to DIRTY so that we don't miss any more | |
2280 | * callbacks being added. | |
2281 | */ | |
2282 | spin_lock(&iclog->ic_callback_lock); | |
2283 | cb = iclog->ic_callback; | |
4b80916b | 2284 | while (cb) { |
1da177e4 LT |
2285 | iclog->ic_callback_tail = &(iclog->ic_callback); |
2286 | iclog->ic_callback = NULL; | |
114d23aa | 2287 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2288 | |
2289 | /* perform callbacks in the order given */ | |
4b80916b | 2290 | for (; cb; cb = cb_next) { |
1da177e4 LT |
2291 | cb_next = cb->cb_next; |
2292 | cb->cb_func(cb->cb_arg, aborted); | |
2293 | } | |
114d23aa | 2294 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
2295 | cb = iclog->ic_callback; |
2296 | } | |
2297 | ||
2298 | loopdidcallbacks++; | |
2299 | funcdidcallbacks++; | |
2300 | ||
114d23aa | 2301 | spin_lock(&log->l_icloglock); |
4b80916b | 2302 | ASSERT(iclog->ic_callback == NULL); |
114d23aa | 2303 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2304 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) |
2305 | iclog->ic_state = XLOG_STATE_DIRTY; | |
2306 | ||
2307 | /* | |
2308 | * Transition from DIRTY to ACTIVE if applicable. | |
2309 | * NOP if STATE_IOERROR. | |
2310 | */ | |
2311 | xlog_state_clean_log(log); | |
2312 | ||
2313 | /* wake up threads waiting in xfs_log_force() */ | |
eb40a875 | 2314 | wake_up_all(&iclog->ic_force_wait); |
1da177e4 LT |
2315 | |
2316 | iclog = iclog->ic_next; | |
2317 | } while (first_iclog != iclog); | |
a3c6685e NS |
2318 | |
2319 | if (repeats > 5000) { | |
2320 | flushcnt += repeats; | |
2321 | repeats = 0; | |
a0fa2b67 | 2322 | xfs_warn(log->l_mp, |
a3c6685e | 2323 | "%s: possible infinite loop (%d iterations)", |
34a622b2 | 2324 | __func__, flushcnt); |
1da177e4 LT |
2325 | } |
2326 | } while (!ioerrors && loopdidcallbacks); | |
2327 | ||
2328 | /* | |
2329 | * make one last gasp attempt to see if iclogs are being left in | |
2330 | * limbo.. | |
2331 | */ | |
2332 | #ifdef DEBUG | |
2333 | if (funcdidcallbacks) { | |
2334 | first_iclog = iclog = log->l_iclog; | |
2335 | do { | |
2336 | ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); | |
2337 | /* | |
2338 | * Terminate the loop if iclogs are found in states | |
2339 | * which will cause other threads to clean up iclogs. | |
2340 | * | |
2341 | * SYNCING - i/o completion will go through logs | |
2342 | * DONE_SYNC - interrupt thread should be waiting for | |
b22cd72c | 2343 | * l_icloglock |
1da177e4 LT |
2344 | * IOERROR - give up hope all ye who enter here |
2345 | */ | |
2346 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC || | |
2347 | iclog->ic_state == XLOG_STATE_SYNCING || | |
2348 | iclog->ic_state == XLOG_STATE_DONE_SYNC || | |
2349 | iclog->ic_state == XLOG_STATE_IOERROR ) | |
2350 | break; | |
2351 | iclog = iclog->ic_next; | |
2352 | } while (first_iclog != iclog); | |
2353 | } | |
2354 | #endif | |
2355 | ||
d748c623 MW |
2356 | if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) |
2357 | wake = 1; | |
b22cd72c | 2358 | spin_unlock(&log->l_icloglock); |
d748c623 MW |
2359 | |
2360 | if (wake) | |
eb40a875 | 2361 | wake_up_all(&log->l_flush_wait); |
d748c623 | 2362 | } |
1da177e4 LT |
2363 | |
2364 | ||
2365 | /* | |
2366 | * Finish transitioning this iclog to the dirty state. | |
2367 | * | |
2368 | * Make sure that we completely execute this routine only when this is | |
2369 | * the last call to the iclog. There is a good chance that iclog flushes, | |
2370 | * when we reach the end of the physical log, get turned into 2 separate | |
2371 | * calls to bwrite. Hence, one iclog flush could generate two calls to this | |
2372 | * routine. By using the reference count bwritecnt, we guarantee that only | |
2373 | * the second completion goes through. | |
2374 | * | |
2375 | * Callbacks could take time, so they are done outside the scope of the | |
12017faf | 2376 | * global state machine log lock. |
1da177e4 | 2377 | */ |
a8272ce0 | 2378 | STATIC void |
1da177e4 LT |
2379 | xlog_state_done_syncing( |
2380 | xlog_in_core_t *iclog, | |
2381 | int aborted) | |
2382 | { | |
2383 | xlog_t *log = iclog->ic_log; | |
1da177e4 | 2384 | |
b22cd72c | 2385 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2386 | |
2387 | ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || | |
2388 | iclog->ic_state == XLOG_STATE_IOERROR); | |
155cc6b7 | 2389 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
2390 | ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); |
2391 | ||
2392 | ||
2393 | /* | |
2394 | * If we got an error, either on the first buffer, or in the case of | |
2395 | * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, | |
2396 | * and none should ever be attempted to be written to disk | |
2397 | * again. | |
2398 | */ | |
2399 | if (iclog->ic_state != XLOG_STATE_IOERROR) { | |
2400 | if (--iclog->ic_bwritecnt == 1) { | |
b22cd72c | 2401 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2402 | return; |
2403 | } | |
2404 | iclog->ic_state = XLOG_STATE_DONE_SYNC; | |
2405 | } | |
2406 | ||
2407 | /* | |
2408 | * Someone could be sleeping prior to writing out the next | |
2409 | * iclog buffer, we wake them all, one will get to do the | |
2410 | * I/O, the others get to wait for the result. | |
2411 | */ | |
eb40a875 | 2412 | wake_up_all(&iclog->ic_write_wait); |
b22cd72c | 2413 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2414 | xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ |
2415 | } /* xlog_state_done_syncing */ | |
2416 | ||
2417 | ||
2418 | /* | |
2419 | * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must | |
12017faf DC |
2420 | * sleep. We wait on the flush queue on the head iclog as that should be |
2421 | * the first iclog to complete flushing. Hence if all iclogs are syncing, | |
2422 | * we will wait here and all new writes will sleep until a sync completes. | |
1da177e4 LT |
2423 | * |
2424 | * The in-core logs are used in a circular fashion. They are not used | |
2425 | * out-of-order even when an iclog past the head is free. | |
2426 | * | |
2427 | * return: | |
2428 | * * log_offset where xlog_write() can start writing into the in-core | |
2429 | * log's data space. | |
2430 | * * in-core log pointer to which xlog_write() should write. | |
2431 | * * boolean indicating this is a continued write to an in-core log. | |
2432 | * If this is the last write, then the in-core log's offset field | |
2433 | * needs to be incremented, depending on the amount of data which | |
2434 | * is copied. | |
2435 | */ | |
a8272ce0 | 2436 | STATIC int |
1da177e4 LT |
2437 | xlog_state_get_iclog_space(xlog_t *log, |
2438 | int len, | |
2439 | xlog_in_core_t **iclogp, | |
2440 | xlog_ticket_t *ticket, | |
2441 | int *continued_write, | |
2442 | int *logoffsetp) | |
2443 | { | |
1da177e4 LT |
2444 | int log_offset; |
2445 | xlog_rec_header_t *head; | |
2446 | xlog_in_core_t *iclog; | |
2447 | int error; | |
2448 | ||
2449 | restart: | |
b22cd72c | 2450 | spin_lock(&log->l_icloglock); |
1da177e4 | 2451 | if (XLOG_FORCED_SHUTDOWN(log)) { |
b22cd72c | 2452 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2453 | return XFS_ERROR(EIO); |
2454 | } | |
2455 | ||
2456 | iclog = log->l_iclog; | |
d748c623 | 2457 | if (iclog->ic_state != XLOG_STATE_ACTIVE) { |
1da177e4 | 2458 | XFS_STATS_INC(xs_log_noiclogs); |
d748c623 MW |
2459 | |
2460 | /* Wait for log writes to have flushed */ | |
eb40a875 | 2461 | xlog_wait(&log->l_flush_wait, &log->l_icloglock); |
1da177e4 LT |
2462 | goto restart; |
2463 | } | |
d748c623 | 2464 | |
1da177e4 LT |
2465 | head = &iclog->ic_header; |
2466 | ||
155cc6b7 | 2467 | atomic_inc(&iclog->ic_refcnt); /* prevents sync */ |
1da177e4 LT |
2468 | log_offset = iclog->ic_offset; |
2469 | ||
2470 | /* On the 1st write to an iclog, figure out lsn. This works | |
2471 | * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are | |
2472 | * committing to. If the offset is set, that's how many blocks | |
2473 | * must be written. | |
2474 | */ | |
2475 | if (log_offset == 0) { | |
2476 | ticket->t_curr_res -= log->l_iclog_hsize; | |
0adba536 | 2477 | xlog_tic_add_region(ticket, |
7e9c6396 TS |
2478 | log->l_iclog_hsize, |
2479 | XLOG_REG_TYPE_LRHEADER); | |
b53e675d CH |
2480 | head->h_cycle = cpu_to_be32(log->l_curr_cycle); |
2481 | head->h_lsn = cpu_to_be64( | |
03bea6fe | 2482 | xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); |
1da177e4 LT |
2483 | ASSERT(log->l_curr_block >= 0); |
2484 | } | |
2485 | ||
2486 | /* If there is enough room to write everything, then do it. Otherwise, | |
2487 | * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC | |
2488 | * bit is on, so this will get flushed out. Don't update ic_offset | |
2489 | * until you know exactly how many bytes get copied. Therefore, wait | |
2490 | * until later to update ic_offset. | |
2491 | * | |
2492 | * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's | |
2493 | * can fit into remaining data section. | |
2494 | */ | |
2495 | if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { | |
2496 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2497 | ||
49641f1a DC |
2498 | /* |
2499 | * If I'm the only one writing to this iclog, sync it to disk. | |
2500 | * We need to do an atomic compare and decrement here to avoid | |
2501 | * racing with concurrent atomic_dec_and_lock() calls in | |
2502 | * xlog_state_release_iclog() when there is more than one | |
2503 | * reference to the iclog. | |
2504 | */ | |
2505 | if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) { | |
2506 | /* we are the only one */ | |
b22cd72c | 2507 | spin_unlock(&log->l_icloglock); |
49641f1a DC |
2508 | error = xlog_state_release_iclog(log, iclog); |
2509 | if (error) | |
014c2544 | 2510 | return error; |
1da177e4 | 2511 | } else { |
b22cd72c | 2512 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2513 | } |
2514 | goto restart; | |
2515 | } | |
2516 | ||
2517 | /* Do we have enough room to write the full amount in the remainder | |
2518 | * of this iclog? Or must we continue a write on the next iclog and | |
2519 | * mark this iclog as completely taken? In the case where we switch | |
2520 | * iclogs (to mark it taken), this particular iclog will release/sync | |
2521 | * to disk in xlog_write(). | |
2522 | */ | |
2523 | if (len <= iclog->ic_size - iclog->ic_offset) { | |
2524 | *continued_write = 0; | |
2525 | iclog->ic_offset += len; | |
2526 | } else { | |
2527 | *continued_write = 1; | |
2528 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2529 | } | |
2530 | *iclogp = iclog; | |
2531 | ||
2532 | ASSERT(iclog->ic_offset <= iclog->ic_size); | |
b22cd72c | 2533 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2534 | |
2535 | *logoffsetp = log_offset; | |
2536 | return 0; | |
2537 | } /* xlog_state_get_iclog_space */ | |
2538 | ||
2539 | /* | |
2540 | * Atomically get the log space required for a log ticket. | |
2541 | * | |
9f9c19ec CH |
2542 | * Once a ticket gets put onto the reserveq, it will only return after the |
2543 | * needed reservation is satisfied. | |
3f16b985 DC |
2544 | * |
2545 | * This function is structured so that it has a lock free fast path. This is | |
2546 | * necessary because every new transaction reservation will come through this | |
2547 | * path. Hence any lock will be globally hot if we take it unconditionally on | |
2548 | * every pass. | |
2549 | * | |
28496968 CH |
2550 | * As tickets are only ever moved on and off the l_reserve.waiters under the |
2551 | * l_reserve.lock, we only need to take that lock if we are going to add | |
9f9c19ec CH |
2552 | * the ticket to the queue and sleep. We can avoid taking the lock if the ticket |
2553 | * was never added to the reserveq because the t_queue list head will be empty | |
2554 | * and we hold the only reference to it so it can safely be checked unlocked. | |
1da177e4 LT |
2555 | */ |
2556 | STATIC int | |
9f9c19ec CH |
2557 | xlog_grant_log_space( |
2558 | struct log *log, | |
2559 | struct xlog_ticket *tic) | |
1da177e4 | 2560 | { |
9f9c19ec CH |
2561 | int free_bytes, need_bytes; |
2562 | int error = 0; | |
1da177e4 | 2563 | |
9f9c19ec | 2564 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
1da177e4 | 2565 | |
0b1b213f | 2566 | trace_xfs_log_grant_enter(log, tic); |
1da177e4 | 2567 | |
9f9c19ec CH |
2568 | /* |
2569 | * If there are other waiters on the queue then give them a chance at | |
2570 | * logspace before us. Wake up the first waiters, if we do not wake | |
2571 | * up all the waiters then go to sleep waiting for more free space, | |
2572 | * otherwise try to get some space for this transaction. | |
2573 | */ | |
3f16b985 DC |
2574 | need_bytes = tic->t_unit_res; |
2575 | if (tic->t_flags & XFS_LOG_PERM_RESERV) | |
2576 | need_bytes *= tic->t_ocnt; | |
28496968 CH |
2577 | free_bytes = xlog_space_left(log, &log->l_reserve_head.grant); |
2578 | if (!list_empty_careful(&log->l_reserve_head.waiters)) { | |
2579 | spin_lock(&log->l_reserve_head.lock); | |
9f9c19ec CH |
2580 | if (!xlog_reserveq_wake(log, &free_bytes) || |
2581 | free_bytes < need_bytes) | |
2582 | error = xlog_reserveq_wait(log, tic, need_bytes); | |
28496968 | 2583 | spin_unlock(&log->l_reserve_head.lock); |
9f9c19ec | 2584 | } else if (free_bytes < need_bytes) { |
28496968 | 2585 | spin_lock(&log->l_reserve_head.lock); |
9f9c19ec | 2586 | error = xlog_reserveq_wait(log, tic, need_bytes); |
28496968 | 2587 | spin_unlock(&log->l_reserve_head.lock); |
3f16b985 | 2588 | } |
9f9c19ec CH |
2589 | if (error) |
2590 | return error; | |
1da177e4 | 2591 | |
28496968 CH |
2592 | xlog_grant_add_space(log, &log->l_reserve_head.grant, need_bytes); |
2593 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); | |
0b1b213f | 2594 | trace_xfs_log_grant_exit(log, tic); |
3f336c6f | 2595 | xlog_verify_grant_tail(log); |
1da177e4 | 2596 | return 0; |
9f9c19ec | 2597 | } |
1da177e4 LT |
2598 | |
2599 | /* | |
2600 | * Replenish the byte reservation required by moving the grant write head. | |
2601 | * | |
3f16b985 DC |
2602 | * Similar to xlog_grant_log_space, the function is structured to have a lock |
2603 | * free fast path. | |
1da177e4 LT |
2604 | */ |
2605 | STATIC int | |
9f9c19ec CH |
2606 | xlog_regrant_write_log_space( |
2607 | struct log *log, | |
2608 | struct xlog_ticket *tic) | |
1da177e4 | 2609 | { |
9f9c19ec CH |
2610 | int free_bytes, need_bytes; |
2611 | int error = 0; | |
1da177e4 LT |
2612 | |
2613 | tic->t_curr_res = tic->t_unit_res; | |
0adba536 | 2614 | xlog_tic_reset_res(tic); |
1da177e4 LT |
2615 | |
2616 | if (tic->t_cnt > 0) | |
014c2544 | 2617 | return 0; |
1da177e4 | 2618 | |
9f9c19ec | 2619 | ASSERT(!(log->l_flags & XLOG_ACTIVE_RECOVERY)); |
1da177e4 | 2620 | |
0b1b213f | 2621 | trace_xfs_log_regrant_write_enter(log, tic); |
1da177e4 | 2622 | |
9f9c19ec CH |
2623 | /* |
2624 | * If there are other waiters on the queue then give them a chance at | |
2625 | * logspace before us. Wake up the first waiters, if we do not wake | |
2626 | * up all the waiters then go to sleep waiting for more free space, | |
2627 | * otherwise try to get some space for this transaction. | |
1da177e4 | 2628 | */ |
9d7fef74 | 2629 | need_bytes = tic->t_unit_res; |
28496968 CH |
2630 | free_bytes = xlog_space_left(log, &log->l_write_head.grant); |
2631 | if (!list_empty_careful(&log->l_write_head.waiters)) { | |
2632 | spin_lock(&log->l_write_head.lock); | |
9f9c19ec CH |
2633 | if (!xlog_writeq_wake(log, &free_bytes) || |
2634 | free_bytes < need_bytes) | |
2635 | error = xlog_writeq_wait(log, tic, need_bytes); | |
28496968 | 2636 | spin_unlock(&log->l_write_head.lock); |
9f9c19ec | 2637 | } else if (free_bytes < need_bytes) { |
28496968 | 2638 | spin_lock(&log->l_write_head.lock); |
9f9c19ec | 2639 | error = xlog_writeq_wait(log, tic, need_bytes); |
28496968 | 2640 | spin_unlock(&log->l_write_head.lock); |
3f16b985 | 2641 | } |
1da177e4 | 2642 | |
9f9c19ec CH |
2643 | if (error) |
2644 | return error; | |
2645 | ||
28496968 | 2646 | xlog_grant_add_space(log, &log->l_write_head.grant, need_bytes); |
0b1b213f | 2647 | trace_xfs_log_regrant_write_exit(log, tic); |
3f336c6f | 2648 | xlog_verify_grant_tail(log); |
014c2544 | 2649 | return 0; |
9f9c19ec | 2650 | } |
1da177e4 LT |
2651 | |
2652 | /* The first cnt-1 times through here we don't need to | |
2653 | * move the grant write head because the permanent | |
2654 | * reservation has reserved cnt times the unit amount. | |
2655 | * Release part of current permanent unit reservation and | |
2656 | * reset current reservation to be one units worth. Also | |
2657 | * move grant reservation head forward. | |
2658 | */ | |
2659 | STATIC void | |
2660 | xlog_regrant_reserve_log_space(xlog_t *log, | |
2661 | xlog_ticket_t *ticket) | |
2662 | { | |
0b1b213f CH |
2663 | trace_xfs_log_regrant_reserve_enter(log, ticket); |
2664 | ||
1da177e4 LT |
2665 | if (ticket->t_cnt > 0) |
2666 | ticket->t_cnt--; | |
2667 | ||
28496968 | 2668 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, |
a69ed03c | 2669 | ticket->t_curr_res); |
28496968 | 2670 | xlog_grant_sub_space(log, &log->l_write_head.grant, |
a69ed03c | 2671 | ticket->t_curr_res); |
1da177e4 | 2672 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2673 | xlog_tic_reset_res(ticket); |
0b1b213f CH |
2674 | |
2675 | trace_xfs_log_regrant_reserve_sub(log, ticket); | |
2676 | ||
1da177e4 | 2677 | /* just return if we still have some of the pre-reserved space */ |
d0eb2f38 | 2678 | if (ticket->t_cnt > 0) |
1da177e4 | 2679 | return; |
1da177e4 | 2680 | |
28496968 | 2681 | xlog_grant_add_space(log, &log->l_reserve_head.grant, |
a69ed03c | 2682 | ticket->t_unit_res); |
0b1b213f CH |
2683 | |
2684 | trace_xfs_log_regrant_reserve_exit(log, ticket); | |
2685 | ||
1da177e4 | 2686 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2687 | xlog_tic_reset_res(ticket); |
1da177e4 LT |
2688 | } /* xlog_regrant_reserve_log_space */ |
2689 | ||
2690 | ||
2691 | /* | |
2692 | * Give back the space left from a reservation. | |
2693 | * | |
2694 | * All the information we need to make a correct determination of space left | |
2695 | * is present. For non-permanent reservations, things are quite easy. The | |
2696 | * count should have been decremented to zero. We only need to deal with the | |
2697 | * space remaining in the current reservation part of the ticket. If the | |
2698 | * ticket contains a permanent reservation, there may be left over space which | |
2699 | * needs to be released. A count of N means that N-1 refills of the current | |
2700 | * reservation can be done before we need to ask for more space. The first | |
2701 | * one goes to fill up the first current reservation. Once we run out of | |
2702 | * space, the count will stay at zero and the only space remaining will be | |
2703 | * in the current reservation field. | |
2704 | */ | |
2705 | STATIC void | |
2706 | xlog_ungrant_log_space(xlog_t *log, | |
2707 | xlog_ticket_t *ticket) | |
2708 | { | |
663e496a DC |
2709 | int bytes; |
2710 | ||
1da177e4 LT |
2711 | if (ticket->t_cnt > 0) |
2712 | ticket->t_cnt--; | |
2713 | ||
0b1b213f | 2714 | trace_xfs_log_ungrant_enter(log, ticket); |
0b1b213f | 2715 | trace_xfs_log_ungrant_sub(log, ticket); |
1da177e4 | 2716 | |
663e496a DC |
2717 | /* |
2718 | * If this is a permanent reservation ticket, we may be able to free | |
1da177e4 LT |
2719 | * up more space based on the remaining count. |
2720 | */ | |
663e496a | 2721 | bytes = ticket->t_curr_res; |
1da177e4 LT |
2722 | if (ticket->t_cnt > 0) { |
2723 | ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); | |
663e496a | 2724 | bytes += ticket->t_unit_res*ticket->t_cnt; |
1da177e4 LT |
2725 | } |
2726 | ||
28496968 CH |
2727 | xlog_grant_sub_space(log, &log->l_reserve_head.grant, bytes); |
2728 | xlog_grant_sub_space(log, &log->l_write_head.grant, bytes); | |
663e496a | 2729 | |
0b1b213f CH |
2730 | trace_xfs_log_ungrant_exit(log, ticket); |
2731 | ||
cfb7cdca | 2732 | xfs_log_space_wake(log->l_mp); |
09a423a3 | 2733 | } |
1da177e4 | 2734 | |
1da177e4 LT |
2735 | /* |
2736 | * Flush iclog to disk if this is the last reference to the given iclog and | |
2737 | * the WANT_SYNC bit is set. | |
2738 | * | |
2739 | * When this function is entered, the iclog is not necessarily in the | |
2740 | * WANT_SYNC state. It may be sitting around waiting to get filled. | |
2741 | * | |
2742 | * | |
2743 | */ | |
a8272ce0 | 2744 | STATIC int |
b589334c DC |
2745 | xlog_state_release_iclog( |
2746 | xlog_t *log, | |
2747 | xlog_in_core_t *iclog) | |
1da177e4 | 2748 | { |
1da177e4 LT |
2749 | int sync = 0; /* do we sync? */ |
2750 | ||
155cc6b7 DC |
2751 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
2752 | return XFS_ERROR(EIO); | |
2753 | ||
2754 | ASSERT(atomic_read(&iclog->ic_refcnt) > 0); | |
2755 | if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) | |
2756 | return 0; | |
2757 | ||
1da177e4 | 2758 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
b22cd72c | 2759 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2760 | return XFS_ERROR(EIO); |
2761 | } | |
1da177e4 LT |
2762 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || |
2763 | iclog->ic_state == XLOG_STATE_WANT_SYNC); | |
2764 | ||
155cc6b7 | 2765 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { |
b589334c | 2766 | /* update tail before writing to iclog */ |
1c3cb9ec | 2767 | xfs_lsn_t tail_lsn = xlog_assign_tail_lsn(log->l_mp); |
1da177e4 LT |
2768 | sync++; |
2769 | iclog->ic_state = XLOG_STATE_SYNCING; | |
1c3cb9ec DC |
2770 | iclog->ic_header.h_tail_lsn = cpu_to_be64(tail_lsn); |
2771 | xlog_verify_tail_lsn(log, iclog, tail_lsn); | |
1da177e4 LT |
2772 | /* cycle incremented when incrementing curr_block */ |
2773 | } | |
b22cd72c | 2774 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2775 | |
2776 | /* | |
2777 | * We let the log lock go, so it's possible that we hit a log I/O | |
c41564b5 | 2778 | * error or some other SHUTDOWN condition that marks the iclog |
1da177e4 LT |
2779 | * as XLOG_STATE_IOERROR before the bwrite. However, we know that |
2780 | * this iclog has consistent data, so we ignore IOERROR | |
2781 | * flags after this point. | |
2782 | */ | |
b589334c | 2783 | if (sync) |
1da177e4 | 2784 | return xlog_sync(log, iclog); |
014c2544 | 2785 | return 0; |
1da177e4 LT |
2786 | } /* xlog_state_release_iclog */ |
2787 | ||
2788 | ||
2789 | /* | |
2790 | * This routine will mark the current iclog in the ring as WANT_SYNC | |
2791 | * and move the current iclog pointer to the next iclog in the ring. | |
2792 | * When this routine is called from xlog_state_get_iclog_space(), the | |
2793 | * exact size of the iclog has not yet been determined. All we know is | |
2794 | * that every data block. We have run out of space in this log record. | |
2795 | */ | |
2796 | STATIC void | |
2797 | xlog_state_switch_iclogs(xlog_t *log, | |
2798 | xlog_in_core_t *iclog, | |
2799 | int eventual_size) | |
2800 | { | |
2801 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
2802 | if (!eventual_size) | |
2803 | eventual_size = iclog->ic_offset; | |
2804 | iclog->ic_state = XLOG_STATE_WANT_SYNC; | |
b53e675d | 2805 | iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); |
1da177e4 LT |
2806 | log->l_prev_block = log->l_curr_block; |
2807 | log->l_prev_cycle = log->l_curr_cycle; | |
2808 | ||
2809 | /* roll log?: ic_offset changed later */ | |
2810 | log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); | |
2811 | ||
2812 | /* Round up to next log-sunit */ | |
62118709 | 2813 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
1da177e4 LT |
2814 | log->l_mp->m_sb.sb_logsunit > 1) { |
2815 | __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); | |
2816 | log->l_curr_block = roundup(log->l_curr_block, sunit_bb); | |
2817 | } | |
2818 | ||
2819 | if (log->l_curr_block >= log->l_logBBsize) { | |
2820 | log->l_curr_cycle++; | |
2821 | if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) | |
2822 | log->l_curr_cycle++; | |
2823 | log->l_curr_block -= log->l_logBBsize; | |
2824 | ASSERT(log->l_curr_block >= 0); | |
2825 | } | |
2826 | ASSERT(iclog == log->l_iclog); | |
2827 | log->l_iclog = iclog->ic_next; | |
2828 | } /* xlog_state_switch_iclogs */ | |
2829 | ||
1da177e4 LT |
2830 | /* |
2831 | * Write out all data in the in-core log as of this exact moment in time. | |
2832 | * | |
2833 | * Data may be written to the in-core log during this call. However, | |
2834 | * we don't guarantee this data will be written out. A change from past | |
2835 | * implementation means this routine will *not* write out zero length LRs. | |
2836 | * | |
2837 | * Basically, we try and perform an intelligent scan of the in-core logs. | |
2838 | * If we determine there is no flushable data, we just return. There is no | |
2839 | * flushable data if: | |
2840 | * | |
2841 | * 1. the current iclog is active and has no data; the previous iclog | |
2842 | * is in the active or dirty state. | |
2843 | * 2. the current iclog is drity, and the previous iclog is in the | |
2844 | * active or dirty state. | |
2845 | * | |
12017faf | 2846 | * We may sleep if: |
1da177e4 LT |
2847 | * |
2848 | * 1. the current iclog is not in the active nor dirty state. | |
2849 | * 2. the current iclog dirty, and the previous iclog is not in the | |
2850 | * active nor dirty state. | |
2851 | * 3. the current iclog is active, and there is another thread writing | |
2852 | * to this particular iclog. | |
2853 | * 4. a) the current iclog is active and has no other writers | |
2854 | * b) when we return from flushing out this iclog, it is still | |
2855 | * not in the active nor dirty state. | |
2856 | */ | |
a14a348b CH |
2857 | int |
2858 | _xfs_log_force( | |
2859 | struct xfs_mount *mp, | |
2860 | uint flags, | |
2861 | int *log_flushed) | |
1da177e4 | 2862 | { |
a14a348b CH |
2863 | struct log *log = mp->m_log; |
2864 | struct xlog_in_core *iclog; | |
2865 | xfs_lsn_t lsn; | |
2866 | ||
2867 | XFS_STATS_INC(xs_log_force); | |
1da177e4 | 2868 | |
93b8a585 | 2869 | xlog_cil_force(log); |
71e330b5 | 2870 | |
b22cd72c | 2871 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2872 | |
2873 | iclog = log->l_iclog; | |
2874 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 2875 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2876 | return XFS_ERROR(EIO); |
2877 | } | |
2878 | ||
2879 | /* If the head iclog is not active nor dirty, we just attach | |
2880 | * ourselves to the head and go to sleep. | |
2881 | */ | |
2882 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2883 | iclog->ic_state == XLOG_STATE_DIRTY) { | |
2884 | /* | |
2885 | * If the head is dirty or (active and empty), then | |
2886 | * we need to look at the previous iclog. If the previous | |
2887 | * iclog is active or dirty we are done. There is nothing | |
2888 | * to sync out. Otherwise, we attach ourselves to the | |
2889 | * previous iclog and go to sleep. | |
2890 | */ | |
2891 | if (iclog->ic_state == XLOG_STATE_DIRTY || | |
155cc6b7 DC |
2892 | (atomic_read(&iclog->ic_refcnt) == 0 |
2893 | && iclog->ic_offset == 0)) { | |
1da177e4 LT |
2894 | iclog = iclog->ic_prev; |
2895 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2896 | iclog->ic_state == XLOG_STATE_DIRTY) | |
2897 | goto no_sleep; | |
2898 | else | |
2899 | goto maybe_sleep; | |
2900 | } else { | |
155cc6b7 | 2901 | if (atomic_read(&iclog->ic_refcnt) == 0) { |
1da177e4 LT |
2902 | /* We are the only one with access to this |
2903 | * iclog. Flush it out now. There should | |
2904 | * be a roundoff of zero to show that someone | |
2905 | * has already taken care of the roundoff from | |
2906 | * the previous sync. | |
2907 | */ | |
155cc6b7 | 2908 | atomic_inc(&iclog->ic_refcnt); |
b53e675d | 2909 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
1da177e4 | 2910 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 2911 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2912 | |
2913 | if (xlog_state_release_iclog(log, iclog)) | |
2914 | return XFS_ERROR(EIO); | |
a14a348b CH |
2915 | |
2916 | if (log_flushed) | |
2917 | *log_flushed = 1; | |
b22cd72c | 2918 | spin_lock(&log->l_icloglock); |
b53e675d | 2919 | if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn && |
1da177e4 LT |
2920 | iclog->ic_state != XLOG_STATE_DIRTY) |
2921 | goto maybe_sleep; | |
2922 | else | |
2923 | goto no_sleep; | |
2924 | } else { | |
2925 | /* Someone else is writing to this iclog. | |
2926 | * Use its call to flush out the data. However, | |
2927 | * the other thread may not force out this LR, | |
2928 | * so we mark it WANT_SYNC. | |
2929 | */ | |
2930 | xlog_state_switch_iclogs(log, iclog, 0); | |
2931 | goto maybe_sleep; | |
2932 | } | |
2933 | } | |
2934 | } | |
2935 | ||
2936 | /* By the time we come around again, the iclog could've been filled | |
2937 | * which would give it another lsn. If we have a new lsn, just | |
2938 | * return because the relevant data has been flushed. | |
2939 | */ | |
2940 | maybe_sleep: | |
2941 | if (flags & XFS_LOG_SYNC) { | |
2942 | /* | |
2943 | * We must check if we're shutting down here, before | |
b22cd72c | 2944 | * we wait, while we're holding the l_icloglock. |
1da177e4 LT |
2945 | * Then we check again after waking up, in case our |
2946 | * sleep was disturbed by a bad news. | |
2947 | */ | |
2948 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 2949 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2950 | return XFS_ERROR(EIO); |
2951 | } | |
2952 | XFS_STATS_INC(xs_log_force_sleep); | |
eb40a875 | 2953 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); |
1da177e4 LT |
2954 | /* |
2955 | * No need to grab the log lock here since we're | |
2956 | * only deciding whether or not to return EIO | |
2957 | * and the memory read should be atomic. | |
2958 | */ | |
2959 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
2960 | return XFS_ERROR(EIO); | |
a14a348b CH |
2961 | if (log_flushed) |
2962 | *log_flushed = 1; | |
1da177e4 LT |
2963 | } else { |
2964 | ||
2965 | no_sleep: | |
b22cd72c | 2966 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2967 | } |
2968 | return 0; | |
a14a348b | 2969 | } |
1da177e4 | 2970 | |
a14a348b CH |
2971 | /* |
2972 | * Wrapper for _xfs_log_force(), to be used when caller doesn't care | |
2973 | * about errors or whether the log was flushed or not. This is the normal | |
2974 | * interface to use when trying to unpin items or move the log forward. | |
2975 | */ | |
2976 | void | |
2977 | xfs_log_force( | |
2978 | xfs_mount_t *mp, | |
2979 | uint flags) | |
2980 | { | |
2981 | int error; | |
2982 | ||
2983 | error = _xfs_log_force(mp, flags, NULL); | |
a0fa2b67 DC |
2984 | if (error) |
2985 | xfs_warn(mp, "%s: error %d returned.", __func__, error); | |
a14a348b | 2986 | } |
1da177e4 LT |
2987 | |
2988 | /* | |
a14a348b | 2989 | * Force the in-core log to disk for a specific LSN. |
1da177e4 LT |
2990 | * |
2991 | * Find in-core log with lsn. | |
2992 | * If it is in the DIRTY state, just return. | |
2993 | * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC | |
2994 | * state and go to sleep or return. | |
2995 | * If it is in any other state, go to sleep or return. | |
2996 | * | |
a14a348b CH |
2997 | * Synchronous forces are implemented with a signal variable. All callers |
2998 | * to force a given lsn to disk will wait on a the sv attached to the | |
2999 | * specific in-core log. When given in-core log finally completes its | |
3000 | * write to disk, that thread will wake up all threads waiting on the | |
3001 | * sv. | |
1da177e4 | 3002 | */ |
a14a348b CH |
3003 | int |
3004 | _xfs_log_force_lsn( | |
3005 | struct xfs_mount *mp, | |
3006 | xfs_lsn_t lsn, | |
3007 | uint flags, | |
3008 | int *log_flushed) | |
1da177e4 | 3009 | { |
a14a348b CH |
3010 | struct log *log = mp->m_log; |
3011 | struct xlog_in_core *iclog; | |
3012 | int already_slept = 0; | |
1da177e4 | 3013 | |
a14a348b | 3014 | ASSERT(lsn != 0); |
1da177e4 | 3015 | |
a14a348b | 3016 | XFS_STATS_INC(xs_log_force); |
1da177e4 | 3017 | |
93b8a585 CH |
3018 | lsn = xlog_cil_force_lsn(log, lsn); |
3019 | if (lsn == NULLCOMMITLSN) | |
3020 | return 0; | |
71e330b5 | 3021 | |
a14a348b CH |
3022 | try_again: |
3023 | spin_lock(&log->l_icloglock); | |
3024 | iclog = log->l_iclog; | |
3025 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3026 | spin_unlock(&log->l_icloglock); |
a14a348b | 3027 | return XFS_ERROR(EIO); |
1da177e4 LT |
3028 | } |
3029 | ||
a14a348b CH |
3030 | do { |
3031 | if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { | |
3032 | iclog = iclog->ic_next; | |
3033 | continue; | |
3034 | } | |
3035 | ||
3036 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
3037 | spin_unlock(&log->l_icloglock); | |
3038 | return 0; | |
3039 | } | |
3040 | ||
3041 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3042 | /* | |
3043 | * We sleep here if we haven't already slept (e.g. | |
3044 | * this is the first time we've looked at the correct | |
3045 | * iclog buf) and the buffer before us is going to | |
3046 | * be sync'ed. The reason for this is that if we | |
3047 | * are doing sync transactions here, by waiting for | |
3048 | * the previous I/O to complete, we can allow a few | |
3049 | * more transactions into this iclog before we close | |
3050 | * it down. | |
3051 | * | |
3052 | * Otherwise, we mark the buffer WANT_SYNC, and bump | |
3053 | * up the refcnt so we can release the log (which | |
3054 | * drops the ref count). The state switch keeps new | |
3055 | * transaction commits from using this buffer. When | |
3056 | * the current commits finish writing into the buffer, | |
3057 | * the refcount will drop to zero and the buffer will | |
3058 | * go out then. | |
3059 | */ | |
3060 | if (!already_slept && | |
3061 | (iclog->ic_prev->ic_state & | |
3062 | (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) { | |
3063 | ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); | |
3064 | ||
3065 | XFS_STATS_INC(xs_log_force_sleep); | |
3066 | ||
eb40a875 DC |
3067 | xlog_wait(&iclog->ic_prev->ic_write_wait, |
3068 | &log->l_icloglock); | |
a14a348b CH |
3069 | if (log_flushed) |
3070 | *log_flushed = 1; | |
3071 | already_slept = 1; | |
3072 | goto try_again; | |
3073 | } | |
155cc6b7 | 3074 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 3075 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 3076 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3077 | if (xlog_state_release_iclog(log, iclog)) |
3078 | return XFS_ERROR(EIO); | |
a14a348b CH |
3079 | if (log_flushed) |
3080 | *log_flushed = 1; | |
b22cd72c | 3081 | spin_lock(&log->l_icloglock); |
1da177e4 | 3082 | } |
1da177e4 | 3083 | |
a14a348b CH |
3084 | if ((flags & XFS_LOG_SYNC) && /* sleep */ |
3085 | !(iclog->ic_state & | |
3086 | (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { | |
3087 | /* | |
3088 | * Don't wait on completion if we know that we've | |
3089 | * gotten a log write error. | |
3090 | */ | |
3091 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
3092 | spin_unlock(&log->l_icloglock); | |
3093 | return XFS_ERROR(EIO); | |
3094 | } | |
3095 | XFS_STATS_INC(xs_log_force_sleep); | |
eb40a875 | 3096 | xlog_wait(&iclog->ic_force_wait, &log->l_icloglock); |
a14a348b CH |
3097 | /* |
3098 | * No need to grab the log lock here since we're | |
3099 | * only deciding whether or not to return EIO | |
3100 | * and the memory read should be atomic. | |
3101 | */ | |
3102 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3103 | return XFS_ERROR(EIO); | |
1da177e4 | 3104 | |
a14a348b CH |
3105 | if (log_flushed) |
3106 | *log_flushed = 1; | |
3107 | } else { /* just return */ | |
b22cd72c | 3108 | spin_unlock(&log->l_icloglock); |
1da177e4 | 3109 | } |
1da177e4 | 3110 | |
a14a348b CH |
3111 | return 0; |
3112 | } while (iclog != log->l_iclog); | |
1da177e4 | 3113 | |
a14a348b CH |
3114 | spin_unlock(&log->l_icloglock); |
3115 | return 0; | |
3116 | } | |
3117 | ||
3118 | /* | |
3119 | * Wrapper for _xfs_log_force_lsn(), to be used when caller doesn't care | |
3120 | * about errors or whether the log was flushed or not. This is the normal | |
3121 | * interface to use when trying to unpin items or move the log forward. | |
3122 | */ | |
3123 | void | |
3124 | xfs_log_force_lsn( | |
3125 | xfs_mount_t *mp, | |
3126 | xfs_lsn_t lsn, | |
3127 | uint flags) | |
3128 | { | |
3129 | int error; | |
1da177e4 | 3130 | |
a14a348b | 3131 | error = _xfs_log_force_lsn(mp, lsn, flags, NULL); |
a0fa2b67 DC |
3132 | if (error) |
3133 | xfs_warn(mp, "%s: error %d returned.", __func__, error); | |
a14a348b | 3134 | } |
1da177e4 LT |
3135 | |
3136 | /* | |
3137 | * Called when we want to mark the current iclog as being ready to sync to | |
3138 | * disk. | |
3139 | */ | |
a8272ce0 | 3140 | STATIC void |
1da177e4 LT |
3141 | xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) |
3142 | { | |
a8914f3a | 3143 | assert_spin_locked(&log->l_icloglock); |
1da177e4 LT |
3144 | |
3145 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3146 | xlog_state_switch_iclogs(log, iclog, 0); | |
3147 | } else { | |
3148 | ASSERT(iclog->ic_state & | |
3149 | (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); | |
3150 | } | |
39e2defe | 3151 | } |
1da177e4 LT |
3152 | |
3153 | ||
3154 | /***************************************************************************** | |
3155 | * | |
3156 | * TICKET functions | |
3157 | * | |
3158 | ***************************************************************************** | |
3159 | */ | |
3160 | ||
3161 | /* | |
9da096fd | 3162 | * Free a used ticket when its refcount falls to zero. |
1da177e4 | 3163 | */ |
cc09c0dc DC |
3164 | void |
3165 | xfs_log_ticket_put( | |
3166 | xlog_ticket_t *ticket) | |
1da177e4 | 3167 | { |
cc09c0dc | 3168 | ASSERT(atomic_read(&ticket->t_ref) > 0); |
eb40a875 | 3169 | if (atomic_dec_and_test(&ticket->t_ref)) |
cc09c0dc | 3170 | kmem_zone_free(xfs_log_ticket_zone, ticket); |
cc09c0dc | 3171 | } |
1da177e4 | 3172 | |
cc09c0dc DC |
3173 | xlog_ticket_t * |
3174 | xfs_log_ticket_get( | |
3175 | xlog_ticket_t *ticket) | |
3176 | { | |
3177 | ASSERT(atomic_read(&ticket->t_ref) > 0); | |
3178 | atomic_inc(&ticket->t_ref); | |
3179 | return ticket; | |
3180 | } | |
1da177e4 LT |
3181 | |
3182 | /* | |
eb01c9cd | 3183 | * Allocate and initialise a new log ticket. |
1da177e4 | 3184 | */ |
71e330b5 | 3185 | xlog_ticket_t * |
9b9fc2b7 DC |
3186 | xlog_ticket_alloc( |
3187 | struct log *log, | |
3188 | int unit_bytes, | |
3189 | int cnt, | |
3190 | char client, | |
3383ca57 DC |
3191 | uint xflags, |
3192 | int alloc_flags) | |
1da177e4 | 3193 | { |
9b9fc2b7 | 3194 | struct xlog_ticket *tic; |
1da177e4 | 3195 | uint num_headers; |
9b9fc2b7 | 3196 | int iclog_space; |
1da177e4 | 3197 | |
3383ca57 | 3198 | tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags); |
eb01c9cd DC |
3199 | if (!tic) |
3200 | return NULL; | |
1da177e4 LT |
3201 | |
3202 | /* | |
3203 | * Permanent reservations have up to 'cnt'-1 active log operations | |
3204 | * in the log. A unit in this case is the amount of space for one | |
3205 | * of these log operations. Normal reservations have a cnt of 1 | |
3206 | * and their unit amount is the total amount of space required. | |
3207 | * | |
3208 | * The following lines of code account for non-transaction data | |
32fb9b57 TS |
3209 | * which occupy space in the on-disk log. |
3210 | * | |
3211 | * Normal form of a transaction is: | |
3212 | * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> | |
3213 | * and then there are LR hdrs, split-recs and roundoff at end of syncs. | |
3214 | * | |
3215 | * We need to account for all the leadup data and trailer data | |
3216 | * around the transaction data. | |
3217 | * And then we need to account for the worst case in terms of using | |
3218 | * more space. | |
3219 | * The worst case will happen if: | |
3220 | * - the placement of the transaction happens to be such that the | |
3221 | * roundoff is at its maximum | |
3222 | * - the transaction data is synced before the commit record is synced | |
3223 | * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> | |
3224 | * Therefore the commit record is in its own Log Record. | |
3225 | * This can happen as the commit record is called with its | |
3226 | * own region to xlog_write(). | |
3227 | * This then means that in the worst case, roundoff can happen for | |
3228 | * the commit-rec as well. | |
3229 | * The commit-rec is smaller than padding in this scenario and so it is | |
3230 | * not added separately. | |
1da177e4 LT |
3231 | */ |
3232 | ||
32fb9b57 TS |
3233 | /* for trans header */ |
3234 | unit_bytes += sizeof(xlog_op_header_t); | |
3235 | unit_bytes += sizeof(xfs_trans_header_t); | |
3236 | ||
1da177e4 | 3237 | /* for start-rec */ |
32fb9b57 TS |
3238 | unit_bytes += sizeof(xlog_op_header_t); |
3239 | ||
9b9fc2b7 DC |
3240 | /* |
3241 | * for LR headers - the space for data in an iclog is the size minus | |
3242 | * the space used for the headers. If we use the iclog size, then we | |
3243 | * undercalculate the number of headers required. | |
3244 | * | |
3245 | * Furthermore - the addition of op headers for split-recs might | |
3246 | * increase the space required enough to require more log and op | |
3247 | * headers, so take that into account too. | |
3248 | * | |
3249 | * IMPORTANT: This reservation makes the assumption that if this | |
3250 | * transaction is the first in an iclog and hence has the LR headers | |
3251 | * accounted to it, then the remaining space in the iclog is | |
3252 | * exclusively for this transaction. i.e. if the transaction is larger | |
3253 | * than the iclog, it will be the only thing in that iclog. | |
3254 | * Fundamentally, this means we must pass the entire log vector to | |
3255 | * xlog_write to guarantee this. | |
3256 | */ | |
3257 | iclog_space = log->l_iclog_size - log->l_iclog_hsize; | |
3258 | num_headers = howmany(unit_bytes, iclog_space); | |
3259 | ||
3260 | /* for split-recs - ophdrs added when data split over LRs */ | |
3261 | unit_bytes += sizeof(xlog_op_header_t) * num_headers; | |
3262 | ||
3263 | /* add extra header reservations if we overrun */ | |
3264 | while (!num_headers || | |
3265 | howmany(unit_bytes, iclog_space) > num_headers) { | |
3266 | unit_bytes += sizeof(xlog_op_header_t); | |
3267 | num_headers++; | |
3268 | } | |
32fb9b57 | 3269 | unit_bytes += log->l_iclog_hsize * num_headers; |
1da177e4 | 3270 | |
32fb9b57 TS |
3271 | /* for commit-rec LR header - note: padding will subsume the ophdr */ |
3272 | unit_bytes += log->l_iclog_hsize; | |
3273 | ||
32fb9b57 | 3274 | /* for roundoff padding for transaction data and one for commit record */ |
62118709 | 3275 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
32fb9b57 | 3276 | log->l_mp->m_sb.sb_logsunit > 1) { |
1da177e4 | 3277 | /* log su roundoff */ |
32fb9b57 | 3278 | unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; |
1da177e4 LT |
3279 | } else { |
3280 | /* BB roundoff */ | |
32fb9b57 | 3281 | unit_bytes += 2*BBSIZE; |
1da177e4 LT |
3282 | } |
3283 | ||
cc09c0dc | 3284 | atomic_set(&tic->t_ref, 1); |
14a7235f | 3285 | tic->t_task = current; |
10547941 | 3286 | INIT_LIST_HEAD(&tic->t_queue); |
1da177e4 LT |
3287 | tic->t_unit_res = unit_bytes; |
3288 | tic->t_curr_res = unit_bytes; | |
3289 | tic->t_cnt = cnt; | |
3290 | tic->t_ocnt = cnt; | |
f9837107 | 3291 | tic->t_tid = random32(); |
1da177e4 LT |
3292 | tic->t_clientid = client; |
3293 | tic->t_flags = XLOG_TIC_INITED; | |
7e9c6396 | 3294 | tic->t_trans_type = 0; |
1da177e4 LT |
3295 | if (xflags & XFS_LOG_PERM_RESERV) |
3296 | tic->t_flags |= XLOG_TIC_PERM_RESERV; | |
1da177e4 | 3297 | |
0adba536 | 3298 | xlog_tic_reset_res(tic); |
7e9c6396 | 3299 | |
1da177e4 | 3300 | return tic; |
cc09c0dc | 3301 | } |
1da177e4 LT |
3302 | |
3303 | ||
3304 | /****************************************************************************** | |
3305 | * | |
3306 | * Log debug routines | |
3307 | * | |
3308 | ****************************************************************************** | |
3309 | */ | |
cfcbbbd0 | 3310 | #if defined(DEBUG) |
1da177e4 LT |
3311 | /* |
3312 | * Make sure that the destination ptr is within the valid data region of | |
3313 | * one of the iclogs. This uses backup pointers stored in a different | |
3314 | * part of the log in case we trash the log structure. | |
3315 | */ | |
3316 | void | |
e6b1f273 CH |
3317 | xlog_verify_dest_ptr( |
3318 | struct log *log, | |
3319 | char *ptr) | |
1da177e4 LT |
3320 | { |
3321 | int i; | |
3322 | int good_ptr = 0; | |
3323 | ||
e6b1f273 CH |
3324 | for (i = 0; i < log->l_iclog_bufs; i++) { |
3325 | if (ptr >= log->l_iclog_bak[i] && | |
3326 | ptr <= log->l_iclog_bak[i] + log->l_iclog_size) | |
1da177e4 LT |
3327 | good_ptr++; |
3328 | } | |
e6b1f273 CH |
3329 | |
3330 | if (!good_ptr) | |
a0fa2b67 | 3331 | xfs_emerg(log->l_mp, "%s: invalid ptr", __func__); |
e6b1f273 | 3332 | } |
1da177e4 | 3333 | |
da8a1a4a DC |
3334 | /* |
3335 | * Check to make sure the grant write head didn't just over lap the tail. If | |
3336 | * the cycles are the same, we can't be overlapping. Otherwise, make sure that | |
3337 | * the cycles differ by exactly one and check the byte count. | |
3338 | * | |
3339 | * This check is run unlocked, so can give false positives. Rather than assert | |
3340 | * on failures, use a warn-once flag and a panic tag to allow the admin to | |
3341 | * determine if they want to panic the machine when such an error occurs. For | |
3342 | * debug kernels this will have the same effect as using an assert but, unlinke | |
3343 | * an assert, it can be turned off at runtime. | |
3344 | */ | |
3f336c6f DC |
3345 | STATIC void |
3346 | xlog_verify_grant_tail( | |
3347 | struct log *log) | |
3348 | { | |
1c3cb9ec | 3349 | int tail_cycle, tail_blocks; |
a69ed03c | 3350 | int cycle, space; |
3f336c6f | 3351 | |
28496968 | 3352 | xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &space); |
1c3cb9ec DC |
3353 | xlog_crack_atomic_lsn(&log->l_tail_lsn, &tail_cycle, &tail_blocks); |
3354 | if (tail_cycle != cycle) { | |
da8a1a4a DC |
3355 | if (cycle - 1 != tail_cycle && |
3356 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3357 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3358 | "%s: cycle - 1 != tail_cycle", __func__); | |
3359 | log->l_flags |= XLOG_TAIL_WARN; | |
3360 | } | |
3361 | ||
3362 | if (space > BBTOB(tail_blocks) && | |
3363 | !(log->l_flags & XLOG_TAIL_WARN)) { | |
3364 | xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, | |
3365 | "%s: space > BBTOB(tail_blocks)", __func__); | |
3366 | log->l_flags |= XLOG_TAIL_WARN; | |
3367 | } | |
3f336c6f DC |
3368 | } |
3369 | } | |
3370 | ||
1da177e4 LT |
3371 | /* check if it will fit */ |
3372 | STATIC void | |
3373 | xlog_verify_tail_lsn(xlog_t *log, | |
3374 | xlog_in_core_t *iclog, | |
3375 | xfs_lsn_t tail_lsn) | |
3376 | { | |
3377 | int blocks; | |
3378 | ||
3379 | if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { | |
3380 | blocks = | |
3381 | log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); | |
3382 | if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) | |
a0fa2b67 | 3383 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3384 | } else { |
3385 | ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); | |
3386 | ||
3387 | if (BLOCK_LSN(tail_lsn) == log->l_prev_block) | |
a0fa2b67 | 3388 | xfs_emerg(log->l_mp, "%s: tail wrapped", __func__); |
1da177e4 LT |
3389 | |
3390 | blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; | |
3391 | if (blocks < BTOBB(iclog->ic_offset) + 1) | |
a0fa2b67 | 3392 | xfs_emerg(log->l_mp, "%s: ran out of log space", __func__); |
1da177e4 LT |
3393 | } |
3394 | } /* xlog_verify_tail_lsn */ | |
3395 | ||
3396 | /* | |
3397 | * Perform a number of checks on the iclog before writing to disk. | |
3398 | * | |
3399 | * 1. Make sure the iclogs are still circular | |
3400 | * 2. Make sure we have a good magic number | |
3401 | * 3. Make sure we don't have magic numbers in the data | |
3402 | * 4. Check fields of each log operation header for: | |
3403 | * A. Valid client identifier | |
3404 | * B. tid ptr value falls in valid ptr space (user space code) | |
3405 | * C. Length in log record header is correct according to the | |
3406 | * individual operation headers within record. | |
3407 | * 5. When a bwrite will occur within 5 blocks of the front of the physical | |
3408 | * log, check the preceding blocks of the physical log to make sure all | |
3409 | * the cycle numbers agree with the current cycle number. | |
3410 | */ | |
3411 | STATIC void | |
3412 | xlog_verify_iclog(xlog_t *log, | |
3413 | xlog_in_core_t *iclog, | |
3414 | int count, | |
3415 | boolean_t syncing) | |
3416 | { | |
3417 | xlog_op_header_t *ophead; | |
3418 | xlog_in_core_t *icptr; | |
3419 | xlog_in_core_2_t *xhdr; | |
3420 | xfs_caddr_t ptr; | |
3421 | xfs_caddr_t base_ptr; | |
3422 | __psint_t field_offset; | |
3423 | __uint8_t clientid; | |
3424 | int len, i, j, k, op_len; | |
3425 | int idx; | |
1da177e4 LT |
3426 | |
3427 | /* check validity of iclog pointers */ | |
b22cd72c | 3428 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3429 | icptr = log->l_iclog; |
3430 | for (i=0; i < log->l_iclog_bufs; i++) { | |
4b80916b | 3431 | if (icptr == NULL) |
a0fa2b67 | 3432 | xfs_emerg(log->l_mp, "%s: invalid ptr", __func__); |
1da177e4 LT |
3433 | icptr = icptr->ic_next; |
3434 | } | |
3435 | if (icptr != log->l_iclog) | |
a0fa2b67 | 3436 | xfs_emerg(log->l_mp, "%s: corrupt iclog ring", __func__); |
b22cd72c | 3437 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3438 | |
3439 | /* check log magic numbers */ | |
69ef921b | 3440 | if (iclog->ic_header.h_magicno != cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 | 3441 | xfs_emerg(log->l_mp, "%s: invalid magic num", __func__); |
1da177e4 | 3442 | |
b53e675d CH |
3443 | ptr = (xfs_caddr_t) &iclog->ic_header; |
3444 | for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count; | |
1da177e4 | 3445 | ptr += BBSIZE) { |
69ef921b | 3446 | if (*(__be32 *)ptr == cpu_to_be32(XLOG_HEADER_MAGIC_NUM)) |
a0fa2b67 DC |
3447 | xfs_emerg(log->l_mp, "%s: unexpected magic num", |
3448 | __func__); | |
1da177e4 LT |
3449 | } |
3450 | ||
3451 | /* check fields */ | |
b53e675d | 3452 | len = be32_to_cpu(iclog->ic_header.h_num_logops); |
1da177e4 LT |
3453 | ptr = iclog->ic_datap; |
3454 | base_ptr = ptr; | |
3455 | ophead = (xlog_op_header_t *)ptr; | |
b28708d6 | 3456 | xhdr = iclog->ic_data; |
1da177e4 LT |
3457 | for (i = 0; i < len; i++) { |
3458 | ophead = (xlog_op_header_t *)ptr; | |
3459 | ||
3460 | /* clientid is only 1 byte */ | |
3461 | field_offset = (__psint_t) | |
3462 | ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); | |
3463 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
3464 | clientid = ophead->oh_clientid; | |
3465 | } else { | |
3466 | idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); | |
3467 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3468 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3469 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
03bea6fe CH |
3470 | clientid = xlog_get_client_id( |
3471 | xhdr[j].hic_xheader.xh_cycle_data[k]); | |
1da177e4 | 3472 | } else { |
03bea6fe CH |
3473 | clientid = xlog_get_client_id( |
3474 | iclog->ic_header.h_cycle_data[idx]); | |
1da177e4 LT |
3475 | } |
3476 | } | |
3477 | if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) | |
a0fa2b67 DC |
3478 | xfs_warn(log->l_mp, |
3479 | "%s: invalid clientid %d op 0x%p offset 0x%lx", | |
3480 | __func__, clientid, ophead, | |
3481 | (unsigned long)field_offset); | |
1da177e4 LT |
3482 | |
3483 | /* check length */ | |
3484 | field_offset = (__psint_t) | |
3485 | ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); | |
3486 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
67fcb7bf | 3487 | op_len = be32_to_cpu(ophead->oh_len); |
1da177e4 LT |
3488 | } else { |
3489 | idx = BTOBBT((__psint_t)&ophead->oh_len - | |
3490 | (__psint_t)iclog->ic_datap); | |
3491 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3492 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3493 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
b53e675d | 3494 | op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); |
1da177e4 | 3495 | } else { |
b53e675d | 3496 | op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); |
1da177e4 LT |
3497 | } |
3498 | } | |
3499 | ptr += sizeof(xlog_op_header_t) + op_len; | |
3500 | } | |
3501 | } /* xlog_verify_iclog */ | |
cfcbbbd0 | 3502 | #endif |
1da177e4 LT |
3503 | |
3504 | /* | |
b22cd72c | 3505 | * Mark all iclogs IOERROR. l_icloglock is held by the caller. |
1da177e4 LT |
3506 | */ |
3507 | STATIC int | |
3508 | xlog_state_ioerror( | |
3509 | xlog_t *log) | |
3510 | { | |
3511 | xlog_in_core_t *iclog, *ic; | |
3512 | ||
3513 | iclog = log->l_iclog; | |
3514 | if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3515 | /* | |
3516 | * Mark all the incore logs IOERROR. | |
3517 | * From now on, no log flushes will result. | |
3518 | */ | |
3519 | ic = iclog; | |
3520 | do { | |
3521 | ic->ic_state = XLOG_STATE_IOERROR; | |
3522 | ic = ic->ic_next; | |
3523 | } while (ic != iclog); | |
014c2544 | 3524 | return 0; |
1da177e4 LT |
3525 | } |
3526 | /* | |
3527 | * Return non-zero, if state transition has already happened. | |
3528 | */ | |
014c2544 | 3529 | return 1; |
1da177e4 LT |
3530 | } |
3531 | ||
3532 | /* | |
3533 | * This is called from xfs_force_shutdown, when we're forcibly | |
3534 | * shutting down the filesystem, typically because of an IO error. | |
3535 | * Our main objectives here are to make sure that: | |
3536 | * a. the filesystem gets marked 'SHUTDOWN' for all interested | |
3537 | * parties to find out, 'atomically'. | |
3538 | * b. those who're sleeping on log reservations, pinned objects and | |
3539 | * other resources get woken up, and be told the bad news. | |
3540 | * c. nothing new gets queued up after (a) and (b) are done. | |
3541 | * d. if !logerror, flush the iclogs to disk, then seal them off | |
3542 | * for business. | |
9da1ab18 DC |
3543 | * |
3544 | * Note: for delayed logging the !logerror case needs to flush the regions | |
3545 | * held in memory out to the iclogs before flushing them to disk. This needs | |
3546 | * to be done before the log is marked as shutdown, otherwise the flush to the | |
3547 | * iclogs will fail. | |
1da177e4 LT |
3548 | */ |
3549 | int | |
3550 | xfs_log_force_umount( | |
3551 | struct xfs_mount *mp, | |
3552 | int logerror) | |
3553 | { | |
3554 | xlog_ticket_t *tic; | |
3555 | xlog_t *log; | |
3556 | int retval; | |
1da177e4 LT |
3557 | |
3558 | log = mp->m_log; | |
3559 | ||
3560 | /* | |
3561 | * If this happens during log recovery, don't worry about | |
3562 | * locking; the log isn't open for business yet. | |
3563 | */ | |
3564 | if (!log || | |
3565 | log->l_flags & XLOG_ACTIVE_RECOVERY) { | |
3566 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
bac8dca9 CH |
3567 | if (mp->m_sb_bp) |
3568 | XFS_BUF_DONE(mp->m_sb_bp); | |
014c2544 | 3569 | return 0; |
1da177e4 LT |
3570 | } |
3571 | ||
3572 | /* | |
3573 | * Somebody could've already done the hard work for us. | |
3574 | * No need to get locks for this. | |
3575 | */ | |
3576 | if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { | |
3577 | ASSERT(XLOG_FORCED_SHUTDOWN(log)); | |
014c2544 | 3578 | return 1; |
1da177e4 LT |
3579 | } |
3580 | retval = 0; | |
9da1ab18 DC |
3581 | |
3582 | /* | |
3583 | * Flush the in memory commit item list before marking the log as | |
3584 | * being shut down. We need to do it in this order to ensure all the | |
3585 | * completed transactions are flushed to disk with the xfs_log_force() | |
3586 | * call below. | |
3587 | */ | |
93b8a585 | 3588 | if (!logerror) |
a44f13ed | 3589 | xlog_cil_force(log); |
9da1ab18 | 3590 | |
1da177e4 | 3591 | /* |
3f16b985 DC |
3592 | * mark the filesystem and the as in a shutdown state and wake |
3593 | * everybody up to tell them the bad news. | |
1da177e4 | 3594 | */ |
b22cd72c | 3595 | spin_lock(&log->l_icloglock); |
1da177e4 | 3596 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
bac8dca9 CH |
3597 | if (mp->m_sb_bp) |
3598 | XFS_BUF_DONE(mp->m_sb_bp); | |
3599 | ||
1da177e4 LT |
3600 | /* |
3601 | * This flag is sort of redundant because of the mount flag, but | |
3602 | * it's good to maintain the separation between the log and the rest | |
3603 | * of XFS. | |
3604 | */ | |
3605 | log->l_flags |= XLOG_IO_ERROR; | |
3606 | ||
3607 | /* | |
3608 | * If we hit a log error, we want to mark all the iclogs IOERROR | |
3609 | * while we're still holding the loglock. | |
3610 | */ | |
3611 | if (logerror) | |
3612 | retval = xlog_state_ioerror(log); | |
b22cd72c | 3613 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3614 | |
3615 | /* | |
10547941 DC |
3616 | * We don't want anybody waiting for log reservations after this. That |
3617 | * means we have to wake up everybody queued up on reserveq as well as | |
3618 | * writeq. In addition, we make sure in xlog_{re}grant_log_space that | |
3619 | * we don't enqueue anything once the SHUTDOWN flag is set, and this | |
3f16b985 | 3620 | * action is protected by the grant locks. |
1da177e4 | 3621 | */ |
28496968 CH |
3622 | spin_lock(&log->l_reserve_head.lock); |
3623 | list_for_each_entry(tic, &log->l_reserve_head.waiters, t_queue) | |
14a7235f | 3624 | wake_up_process(tic->t_task); |
28496968 | 3625 | spin_unlock(&log->l_reserve_head.lock); |
1da177e4 | 3626 | |
28496968 CH |
3627 | spin_lock(&log->l_write_head.lock); |
3628 | list_for_each_entry(tic, &log->l_write_head.waiters, t_queue) | |
14a7235f | 3629 | wake_up_process(tic->t_task); |
28496968 | 3630 | spin_unlock(&log->l_write_head.lock); |
1da177e4 | 3631 | |
a14a348b | 3632 | if (!(log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { |
1da177e4 LT |
3633 | ASSERT(!logerror); |
3634 | /* | |
3635 | * Force the incore logs to disk before shutting the | |
3636 | * log down completely. | |
3637 | */ | |
a14a348b CH |
3638 | _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
3639 | ||
b22cd72c | 3640 | spin_lock(&log->l_icloglock); |
1da177e4 | 3641 | retval = xlog_state_ioerror(log); |
b22cd72c | 3642 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3643 | } |
3644 | /* | |
3645 | * Wake up everybody waiting on xfs_log_force. | |
3646 | * Callback all log item committed functions as if the | |
3647 | * log writes were completed. | |
3648 | */ | |
3649 | xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); | |
3650 | ||
3651 | #ifdef XFSERRORDEBUG | |
3652 | { | |
3653 | xlog_in_core_t *iclog; | |
3654 | ||
b22cd72c | 3655 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3656 | iclog = log->l_iclog; |
3657 | do { | |
3658 | ASSERT(iclog->ic_callback == 0); | |
3659 | iclog = iclog->ic_next; | |
3660 | } while (iclog != log->l_iclog); | |
b22cd72c | 3661 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3662 | } |
3663 | #endif | |
3664 | /* return non-zero if log IOERROR transition had already happened */ | |
014c2544 | 3665 | return retval; |
1da177e4 LT |
3666 | } |
3667 | ||
ba0f32d4 | 3668 | STATIC int |
1da177e4 LT |
3669 | xlog_iclogs_empty(xlog_t *log) |
3670 | { | |
3671 | xlog_in_core_t *iclog; | |
3672 | ||
3673 | iclog = log->l_iclog; | |
3674 | do { | |
3675 | /* endianness does not matter here, zero is zero in | |
3676 | * any language. | |
3677 | */ | |
3678 | if (iclog->ic_header.h_num_logops) | |
014c2544 | 3679 | return 0; |
1da177e4 LT |
3680 | iclog = iclog->ic_next; |
3681 | } while (iclog != log->l_iclog); | |
014c2544 | 3682 | return 1; |
1da177e4 | 3683 | } |