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" | |
a844f451 | 27 | #include "xfs_dir2.h" |
1da177e4 LT |
28 | #include "xfs_dmapi.h" |
29 | #include "xfs_mount.h" | |
30 | #include "xfs_error.h" | |
31 | #include "xfs_log_priv.h" | |
32 | #include "xfs_buf_item.h" | |
a844f451 | 33 | #include "xfs_bmap_btree.h" |
1da177e4 | 34 | #include "xfs_alloc_btree.h" |
a844f451 | 35 | #include "xfs_ialloc_btree.h" |
1da177e4 | 36 | #include "xfs_log_recover.h" |
1da177e4 | 37 | #include "xfs_trans_priv.h" |
a844f451 NS |
38 | #include "xfs_dir2_sf.h" |
39 | #include "xfs_attr_sf.h" | |
40 | #include "xfs_dinode.h" | |
41 | #include "xfs_inode.h" | |
42 | #include "xfs_rw.h" | |
0b1b213f | 43 | #include "xfs_trace.h" |
1da177e4 | 44 | |
eb01c9cd | 45 | kmem_zone_t *xfs_log_ticket_zone; |
1da177e4 LT |
46 | |
47 | #define xlog_write_adv_cnt(ptr, len, off, bytes) \ | |
48 | { (ptr) += (bytes); \ | |
49 | (len) -= (bytes); \ | |
50 | (off) += (bytes);} | |
51 | ||
52 | /* Local miscellaneous function prototypes */ | |
1da177e4 LT |
53 | STATIC int xlog_commit_record(xfs_mount_t *mp, xlog_ticket_t *ticket, |
54 | xlog_in_core_t **, xfs_lsn_t *); | |
55 | STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp, | |
56 | xfs_buftarg_t *log_target, | |
57 | xfs_daddr_t blk_offset, | |
58 | int num_bblks); | |
59 | STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes); | |
60 | STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog); | |
c41564b5 | 61 | STATIC void xlog_dealloc_log(xlog_t *log); |
1da177e4 | 62 | STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[], |
35a8a72f | 63 | int nentries, struct xlog_ticket *tic, |
1da177e4 LT |
64 | xfs_lsn_t *start_lsn, |
65 | xlog_in_core_t **commit_iclog, | |
66 | uint flags); | |
67 | ||
68 | /* local state machine functions */ | |
69 | STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int); | |
70 | STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog); | |
71 | STATIC int xlog_state_get_iclog_space(xlog_t *log, | |
72 | int len, | |
73 | xlog_in_core_t **iclog, | |
74 | xlog_ticket_t *ticket, | |
75 | int *continued_write, | |
76 | int *logoffsetp); | |
1da177e4 LT |
77 | STATIC int xlog_state_release_iclog(xlog_t *log, |
78 | xlog_in_core_t *iclog); | |
79 | STATIC void xlog_state_switch_iclogs(xlog_t *log, | |
80 | xlog_in_core_t *iclog, | |
81 | int eventual_size); | |
1da177e4 LT |
82 | STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); |
83 | ||
84 | /* local functions to manipulate grant head */ | |
85 | STATIC int xlog_grant_log_space(xlog_t *log, | |
86 | xlog_ticket_t *xtic); | |
87 | STATIC void xlog_grant_push_ail(xfs_mount_t *mp, | |
88 | int need_bytes); | |
89 | STATIC void xlog_regrant_reserve_log_space(xlog_t *log, | |
90 | xlog_ticket_t *ticket); | |
91 | STATIC int xlog_regrant_write_log_space(xlog_t *log, | |
92 | xlog_ticket_t *ticket); | |
93 | STATIC void xlog_ungrant_log_space(xlog_t *log, | |
94 | xlog_ticket_t *ticket); | |
95 | ||
96 | ||
97 | /* local ticket functions */ | |
cc09c0dc | 98 | STATIC xlog_ticket_t *xlog_ticket_alloc(xlog_t *log, |
1da177e4 LT |
99 | int unit_bytes, |
100 | int count, | |
101 | char clientid, | |
102 | uint flags); | |
1da177e4 | 103 | |
cfcbbbd0 | 104 | #if defined(DEBUG) |
1da177e4 LT |
105 | STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr); |
106 | STATIC void xlog_verify_grant_head(xlog_t *log, int equals); | |
107 | STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, | |
108 | int count, boolean_t syncing); | |
109 | STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, | |
110 | xfs_lsn_t tail_lsn); | |
111 | #else | |
112 | #define xlog_verify_dest_ptr(a,b) | |
113 | #define xlog_verify_grant_head(a,b) | |
114 | #define xlog_verify_iclog(a,b,c,d) | |
115 | #define xlog_verify_tail_lsn(a,b,c) | |
116 | #endif | |
117 | ||
ba0f32d4 | 118 | STATIC int xlog_iclogs_empty(xlog_t *log); |
1da177e4 | 119 | |
dd954c69 CH |
120 | |
121 | static void | |
122 | xlog_ins_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) | |
123 | { | |
124 | if (*qp) { | |
125 | tic->t_next = (*qp); | |
126 | tic->t_prev = (*qp)->t_prev; | |
127 | (*qp)->t_prev->t_next = tic; | |
128 | (*qp)->t_prev = tic; | |
129 | } else { | |
130 | tic->t_prev = tic->t_next = tic; | |
131 | *qp = tic; | |
132 | } | |
133 | ||
134 | tic->t_flags |= XLOG_TIC_IN_Q; | |
135 | } | |
136 | ||
137 | static void | |
138 | xlog_del_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) | |
139 | { | |
140 | if (tic == tic->t_next) { | |
141 | *qp = NULL; | |
142 | } else { | |
143 | *qp = tic->t_next; | |
144 | tic->t_next->t_prev = tic->t_prev; | |
145 | tic->t_prev->t_next = tic->t_next; | |
146 | } | |
147 | ||
148 | tic->t_next = tic->t_prev = NULL; | |
149 | tic->t_flags &= ~XLOG_TIC_IN_Q; | |
150 | } | |
151 | ||
152 | static void | |
153 | xlog_grant_sub_space(struct log *log, int bytes) | |
154 | { | |
155 | log->l_grant_write_bytes -= bytes; | |
156 | if (log->l_grant_write_bytes < 0) { | |
157 | log->l_grant_write_bytes += log->l_logsize; | |
158 | log->l_grant_write_cycle--; | |
159 | } | |
160 | ||
161 | log->l_grant_reserve_bytes -= bytes; | |
162 | if ((log)->l_grant_reserve_bytes < 0) { | |
163 | log->l_grant_reserve_bytes += log->l_logsize; | |
164 | log->l_grant_reserve_cycle--; | |
165 | } | |
166 | ||
167 | } | |
168 | ||
169 | static void | |
170 | xlog_grant_add_space_write(struct log *log, int bytes) | |
171 | { | |
d729eae8 MN |
172 | int tmp = log->l_logsize - log->l_grant_write_bytes; |
173 | if (tmp > bytes) | |
174 | log->l_grant_write_bytes += bytes; | |
175 | else { | |
dd954c69 | 176 | log->l_grant_write_cycle++; |
d729eae8 | 177 | log->l_grant_write_bytes = bytes - tmp; |
dd954c69 CH |
178 | } |
179 | } | |
180 | ||
181 | static void | |
182 | xlog_grant_add_space_reserve(struct log *log, int bytes) | |
183 | { | |
d729eae8 MN |
184 | int tmp = log->l_logsize - log->l_grant_reserve_bytes; |
185 | if (tmp > bytes) | |
186 | log->l_grant_reserve_bytes += bytes; | |
187 | else { | |
dd954c69 | 188 | log->l_grant_reserve_cycle++; |
d729eae8 | 189 | log->l_grant_reserve_bytes = bytes - tmp; |
dd954c69 CH |
190 | } |
191 | } | |
192 | ||
193 | static inline void | |
194 | xlog_grant_add_space(struct log *log, int bytes) | |
195 | { | |
196 | xlog_grant_add_space_write(log, bytes); | |
197 | xlog_grant_add_space_reserve(log, bytes); | |
198 | } | |
199 | ||
0adba536 CH |
200 | static void |
201 | xlog_tic_reset_res(xlog_ticket_t *tic) | |
202 | { | |
203 | tic->t_res_num = 0; | |
204 | tic->t_res_arr_sum = 0; | |
205 | tic->t_res_num_ophdrs = 0; | |
206 | } | |
207 | ||
208 | static void | |
209 | xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) | |
210 | { | |
211 | if (tic->t_res_num == XLOG_TIC_LEN_MAX) { | |
212 | /* add to overflow and start again */ | |
213 | tic->t_res_o_flow += tic->t_res_arr_sum; | |
214 | tic->t_res_num = 0; | |
215 | tic->t_res_arr_sum = 0; | |
216 | } | |
217 | ||
218 | tic->t_res_arr[tic->t_res_num].r_len = len; | |
219 | tic->t_res_arr[tic->t_res_num].r_type = type; | |
220 | tic->t_res_arr_sum += len; | |
221 | tic->t_res_num++; | |
222 | } | |
dd954c69 | 223 | |
1da177e4 LT |
224 | /* |
225 | * NOTES: | |
226 | * | |
227 | * 1. currblock field gets updated at startup and after in-core logs | |
228 | * marked as with WANT_SYNC. | |
229 | */ | |
230 | ||
231 | /* | |
232 | * This routine is called when a user of a log manager ticket is done with | |
233 | * the reservation. If the ticket was ever used, then a commit record for | |
234 | * the associated transaction is written out as a log operation header with | |
235 | * no data. The flag XLOG_TIC_INITED is set when the first write occurs with | |
236 | * a given ticket. If the ticket was one with a permanent reservation, then | |
237 | * a few operations are done differently. Permanent reservation tickets by | |
238 | * default don't release the reservation. They just commit the current | |
239 | * transaction with the belief that the reservation is still needed. A flag | |
240 | * must be passed in before permanent reservations are actually released. | |
241 | * When these type of tickets are not released, they need to be set into | |
242 | * the inited state again. By doing this, a start record will be written | |
243 | * out when the next write occurs. | |
244 | */ | |
245 | xfs_lsn_t | |
35a8a72f CH |
246 | xfs_log_done( |
247 | struct xfs_mount *mp, | |
248 | struct xlog_ticket *ticket, | |
249 | struct xlog_in_core **iclog, | |
250 | uint flags) | |
1da177e4 | 251 | { |
35a8a72f CH |
252 | struct log *log = mp->m_log; |
253 | xfs_lsn_t lsn = 0; | |
1da177e4 | 254 | |
1da177e4 LT |
255 | if (XLOG_FORCED_SHUTDOWN(log) || |
256 | /* | |
257 | * If nothing was ever written, don't write out commit record. | |
258 | * If we get an error, just continue and give back the log ticket. | |
259 | */ | |
260 | (((ticket->t_flags & XLOG_TIC_INITED) == 0) && | |
35a8a72f | 261 | (xlog_commit_record(mp, ticket, iclog, &lsn)))) { |
1da177e4 LT |
262 | lsn = (xfs_lsn_t) -1; |
263 | if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { | |
264 | flags |= XFS_LOG_REL_PERM_RESERV; | |
265 | } | |
266 | } | |
267 | ||
268 | ||
269 | if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || | |
270 | (flags & XFS_LOG_REL_PERM_RESERV)) { | |
0b1b213f CH |
271 | trace_xfs_log_done_nonperm(log, ticket); |
272 | ||
1da177e4 | 273 | /* |
c41564b5 | 274 | * Release ticket if not permanent reservation or a specific |
1da177e4 LT |
275 | * request has been made to release a permanent reservation. |
276 | */ | |
277 | xlog_ungrant_log_space(log, ticket); | |
cc09c0dc | 278 | xfs_log_ticket_put(ticket); |
1da177e4 | 279 | } else { |
0b1b213f CH |
280 | trace_xfs_log_done_perm(log, ticket); |
281 | ||
1da177e4 | 282 | xlog_regrant_reserve_log_space(log, ticket); |
c6a7b0f8 LM |
283 | /* If this ticket was a permanent reservation and we aren't |
284 | * trying to release it, reset the inited flags; so next time | |
285 | * we write, a start record will be written out. | |
286 | */ | |
1da177e4 | 287 | ticket->t_flags |= XLOG_TIC_INITED; |
c6a7b0f8 | 288 | } |
1da177e4 LT |
289 | |
290 | return lsn; | |
35a8a72f | 291 | } |
1da177e4 | 292 | |
1da177e4 LT |
293 | /* |
294 | * Attaches a new iclog I/O completion callback routine during | |
295 | * transaction commit. If the log is in error state, a non-zero | |
296 | * return code is handed back and the caller is responsible for | |
297 | * executing the callback at an appropriate time. | |
298 | */ | |
299 | int | |
35a8a72f CH |
300 | xfs_log_notify( |
301 | struct xfs_mount *mp, | |
302 | struct xlog_in_core *iclog, | |
303 | xfs_log_callback_t *cb) | |
1da177e4 | 304 | { |
b22cd72c | 305 | int abortflg; |
1da177e4 | 306 | |
114d23aa | 307 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
308 | abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); |
309 | if (!abortflg) { | |
310 | ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || | |
311 | (iclog->ic_state == XLOG_STATE_WANT_SYNC)); | |
312 | cb->cb_next = NULL; | |
313 | *(iclog->ic_callback_tail) = cb; | |
314 | iclog->ic_callback_tail = &(cb->cb_next); | |
315 | } | |
114d23aa | 316 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 | 317 | return abortflg; |
35a8a72f | 318 | } |
1da177e4 LT |
319 | |
320 | int | |
35a8a72f CH |
321 | xfs_log_release_iclog( |
322 | struct xfs_mount *mp, | |
323 | struct xlog_in_core *iclog) | |
1da177e4 | 324 | { |
35a8a72f | 325 | if (xlog_state_release_iclog(mp->m_log, iclog)) { |
7d04a335 | 326 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 327 | return EIO; |
1da177e4 LT |
328 | } |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | /* | |
334 | * 1. Reserve an amount of on-disk log space and return a ticket corresponding | |
335 | * to the reservation. | |
336 | * 2. Potentially, push buffers at tail of log to disk. | |
337 | * | |
338 | * Each reservation is going to reserve extra space for a log record header. | |
339 | * When writes happen to the on-disk log, we don't subtract the length of the | |
340 | * log record header from any reservation. By wasting space in each | |
341 | * reservation, we prevent over allocation problems. | |
342 | */ | |
343 | int | |
35a8a72f CH |
344 | xfs_log_reserve( |
345 | struct xfs_mount *mp, | |
346 | int unit_bytes, | |
347 | int cnt, | |
348 | struct xlog_ticket **ticket, | |
349 | __uint8_t client, | |
350 | uint flags, | |
351 | uint t_type) | |
1da177e4 | 352 | { |
35a8a72f CH |
353 | struct log *log = mp->m_log; |
354 | struct xlog_ticket *internal_ticket; | |
355 | int retval = 0; | |
1da177e4 | 356 | |
1da177e4 LT |
357 | ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); |
358 | ASSERT((flags & XFS_LOG_NOSLEEP) == 0); | |
359 | ||
360 | if (XLOG_FORCED_SHUTDOWN(log)) | |
361 | return XFS_ERROR(EIO); | |
362 | ||
363 | XFS_STATS_INC(xs_try_logspace); | |
364 | ||
0b1b213f | 365 | |
1da177e4 LT |
366 | if (*ticket != NULL) { |
367 | ASSERT(flags & XFS_LOG_PERM_RESERV); | |
35a8a72f | 368 | internal_ticket = *ticket; |
0b1b213f CH |
369 | |
370 | trace_xfs_log_reserve(log, internal_ticket); | |
371 | ||
1da177e4 LT |
372 | xlog_grant_push_ail(mp, internal_ticket->t_unit_res); |
373 | retval = xlog_regrant_write_log_space(log, internal_ticket); | |
374 | } else { | |
375 | /* may sleep if need to allocate more tickets */ | |
cc09c0dc | 376 | internal_ticket = xlog_ticket_alloc(log, unit_bytes, cnt, |
1da177e4 | 377 | client, flags); |
eb01c9cd DC |
378 | if (!internal_ticket) |
379 | return XFS_ERROR(ENOMEM); | |
7e9c6396 | 380 | internal_ticket->t_trans_type = t_type; |
1da177e4 | 381 | *ticket = internal_ticket; |
0b1b213f CH |
382 | |
383 | trace_xfs_log_reserve(log, internal_ticket); | |
384 | ||
1da177e4 LT |
385 | xlog_grant_push_ail(mp, |
386 | (internal_ticket->t_unit_res * | |
387 | internal_ticket->t_cnt)); | |
388 | retval = xlog_grant_log_space(log, internal_ticket); | |
389 | } | |
390 | ||
391 | return retval; | |
392 | } /* xfs_log_reserve */ | |
393 | ||
394 | ||
395 | /* | |
396 | * Mount a log filesystem | |
397 | * | |
398 | * mp - ubiquitous xfs mount point structure | |
399 | * log_target - buftarg of on-disk log device | |
400 | * blk_offset - Start block # where block size is 512 bytes (BBSIZE) | |
401 | * num_bblocks - Number of BBSIZE blocks in on-disk log | |
402 | * | |
403 | * Return error or zero. | |
404 | */ | |
405 | int | |
249a8c11 DC |
406 | xfs_log_mount( |
407 | xfs_mount_t *mp, | |
408 | xfs_buftarg_t *log_target, | |
409 | xfs_daddr_t blk_offset, | |
410 | int num_bblks) | |
1da177e4 | 411 | { |
249a8c11 DC |
412 | int error; |
413 | ||
1da177e4 LT |
414 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) |
415 | cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); | |
416 | else { | |
417 | cmn_err(CE_NOTE, | |
418 | "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", | |
419 | mp->m_fsname); | |
bd186aa9 | 420 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
421 | } |
422 | ||
423 | mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); | |
a6cb767e DC |
424 | if (IS_ERR(mp->m_log)) { |
425 | error = -PTR_ERR(mp->m_log); | |
644c3567 DC |
426 | goto out; |
427 | } | |
1da177e4 | 428 | |
249a8c11 DC |
429 | /* |
430 | * Initialize the AIL now we have a log. | |
431 | */ | |
249a8c11 DC |
432 | error = xfs_trans_ail_init(mp); |
433 | if (error) { | |
434 | cmn_err(CE_WARN, "XFS: AIL initialisation failed: error %d", error); | |
26430752 | 435 | goto out_free_log; |
249a8c11 | 436 | } |
a9c21c1b | 437 | mp->m_log->l_ailp = mp->m_ail; |
249a8c11 | 438 | |
1da177e4 LT |
439 | /* |
440 | * skip log recovery on a norecovery mount. pretend it all | |
441 | * just worked. | |
442 | */ | |
443 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { | |
249a8c11 | 444 | int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
445 | |
446 | if (readonly) | |
bd186aa9 | 447 | mp->m_flags &= ~XFS_MOUNT_RDONLY; |
1da177e4 | 448 | |
65be6054 | 449 | error = xlog_recover(mp->m_log); |
1da177e4 LT |
450 | |
451 | if (readonly) | |
bd186aa9 | 452 | mp->m_flags |= XFS_MOUNT_RDONLY; |
1da177e4 LT |
453 | if (error) { |
454 | cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); | |
26430752 | 455 | goto out_destroy_ail; |
1da177e4 LT |
456 | } |
457 | } | |
458 | ||
459 | /* Normal transactions can now occur */ | |
460 | mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; | |
461 | ||
1da177e4 | 462 | return 0; |
26430752 CH |
463 | |
464 | out_destroy_ail: | |
465 | xfs_trans_ail_destroy(mp); | |
466 | out_free_log: | |
467 | xlog_dealloc_log(mp->m_log); | |
644c3567 | 468 | out: |
249a8c11 | 469 | return error; |
26430752 | 470 | } |
1da177e4 LT |
471 | |
472 | /* | |
473 | * Finish the recovery of the file system. This is separate from | |
474 | * the xfs_log_mount() call, because it depends on the code in | |
475 | * xfs_mountfs() to read in the root and real-time bitmap inodes | |
476 | * between calling xfs_log_mount() and here. | |
477 | * | |
478 | * mp - ubiquitous xfs mount point structure | |
479 | */ | |
480 | int | |
4249023a | 481 | xfs_log_mount_finish(xfs_mount_t *mp) |
1da177e4 LT |
482 | { |
483 | int error; | |
484 | ||
485 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) | |
4249023a | 486 | error = xlog_recover_finish(mp->m_log); |
1da177e4 LT |
487 | else { |
488 | error = 0; | |
bd186aa9 | 489 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
490 | } |
491 | ||
492 | return error; | |
493 | } | |
494 | ||
1da177e4 LT |
495 | /* |
496 | * Final log writes as part of unmount. | |
497 | * | |
498 | * Mark the filesystem clean as unmount happens. Note that during relocation | |
499 | * this routine needs to be executed as part of source-bag while the | |
500 | * deallocation must not be done until source-end. | |
501 | */ | |
502 | ||
503 | /* | |
504 | * Unmount record used to have a string "Unmount filesystem--" in the | |
505 | * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). | |
506 | * We just write the magic number now since that particular field isn't | |
507 | * currently architecture converted and "nUmount" is a bit foo. | |
508 | * As far as I know, there weren't any dependencies on the old behaviour. | |
509 | */ | |
510 | ||
511 | int | |
512 | xfs_log_unmount_write(xfs_mount_t *mp) | |
513 | { | |
514 | xlog_t *log = mp->m_log; | |
515 | xlog_in_core_t *iclog; | |
516 | #ifdef DEBUG | |
517 | xlog_in_core_t *first_iclog; | |
518 | #endif | |
519 | xfs_log_iovec_t reg[1]; | |
35a8a72f | 520 | xlog_ticket_t *tic = NULL; |
1da177e4 LT |
521 | xfs_lsn_t lsn; |
522 | int error; | |
1da177e4 LT |
523 | |
524 | /* the data section must be 32 bit size aligned */ | |
525 | struct { | |
526 | __uint16_t magic; | |
527 | __uint16_t pad1; | |
528 | __uint32_t pad2; /* may as well make it 64 bits */ | |
529 | } magic = { XLOG_UNMOUNT_TYPE, 0, 0 }; | |
530 | ||
1da177e4 LT |
531 | /* |
532 | * Don't write out unmount record on read-only mounts. | |
533 | * Or, if we are doing a forced umount (typically because of IO errors). | |
534 | */ | |
bd186aa9 | 535 | if (mp->m_flags & XFS_MOUNT_RDONLY) |
1da177e4 LT |
536 | return 0; |
537 | ||
a14a348b | 538 | error = _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
b911ca04 | 539 | ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); |
1da177e4 LT |
540 | |
541 | #ifdef DEBUG | |
542 | first_iclog = iclog = log->l_iclog; | |
543 | do { | |
544 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
545 | ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); | |
546 | ASSERT(iclog->ic_offset == 0); | |
547 | } | |
548 | iclog = iclog->ic_next; | |
549 | } while (iclog != first_iclog); | |
550 | #endif | |
551 | if (! (XLOG_FORCED_SHUTDOWN(log))) { | |
552 | reg[0].i_addr = (void*)&magic; | |
553 | reg[0].i_len = sizeof(magic); | |
4139b3b3 | 554 | reg[0].i_type = XLOG_REG_TYPE_UNMOUNT; |
1da177e4 | 555 | |
955e47ad TS |
556 | error = xfs_log_reserve(mp, 600, 1, &tic, |
557 | XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); | |
1da177e4 LT |
558 | if (!error) { |
559 | /* remove inited flag */ | |
560 | ((xlog_ticket_t *)tic)->t_flags = 0; | |
561 | error = xlog_write(mp, reg, 1, tic, &lsn, | |
562 | NULL, XLOG_UNMOUNT_TRANS); | |
563 | /* | |
564 | * At this point, we're umounting anyway, | |
565 | * so there's no point in transitioning log state | |
566 | * to IOERROR. Just continue... | |
567 | */ | |
568 | } | |
569 | ||
570 | if (error) { | |
571 | xfs_fs_cmn_err(CE_ALERT, mp, | |
572 | "xfs_log_unmount: unmount record failed"); | |
573 | } | |
574 | ||
575 | ||
b22cd72c | 576 | spin_lock(&log->l_icloglock); |
1da177e4 | 577 | iclog = log->l_iclog; |
155cc6b7 | 578 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 579 | xlog_state_want_sync(log, iclog); |
39e2defe | 580 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 581 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 582 | |
b22cd72c | 583 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
584 | if (!(iclog->ic_state == XLOG_STATE_ACTIVE || |
585 | iclog->ic_state == XLOG_STATE_DIRTY)) { | |
586 | if (!XLOG_FORCED_SHUTDOWN(log)) { | |
12017faf | 587 | sv_wait(&iclog->ic_force_wait, PMEM, |
1da177e4 LT |
588 | &log->l_icloglock, s); |
589 | } else { | |
b22cd72c | 590 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
591 | } |
592 | } else { | |
b22cd72c | 593 | spin_unlock(&log->l_icloglock); |
1da177e4 | 594 | } |
955e47ad | 595 | if (tic) { |
0b1b213f | 596 | trace_xfs_log_umount_write(log, tic); |
955e47ad | 597 | xlog_ungrant_log_space(log, tic); |
cc09c0dc | 598 | xfs_log_ticket_put(tic); |
955e47ad | 599 | } |
1da177e4 LT |
600 | } else { |
601 | /* | |
602 | * We're already in forced_shutdown mode, couldn't | |
603 | * even attempt to write out the unmount transaction. | |
604 | * | |
605 | * Go through the motions of sync'ing and releasing | |
606 | * the iclog, even though no I/O will actually happen, | |
c41564b5 | 607 | * we need to wait for other log I/Os that may already |
1da177e4 LT |
608 | * be in progress. Do this as a separate section of |
609 | * code so we'll know if we ever get stuck here that | |
610 | * we're in this odd situation of trying to unmount | |
611 | * a file system that went into forced_shutdown as | |
612 | * the result of an unmount.. | |
613 | */ | |
b22cd72c | 614 | spin_lock(&log->l_icloglock); |
1da177e4 | 615 | iclog = log->l_iclog; |
155cc6b7 | 616 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 LT |
617 | |
618 | xlog_state_want_sync(log, iclog); | |
39e2defe | 619 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 620 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 621 | |
b22cd72c | 622 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
623 | |
624 | if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE | |
625 | || iclog->ic_state == XLOG_STATE_DIRTY | |
626 | || iclog->ic_state == XLOG_STATE_IOERROR) ) { | |
627 | ||
12017faf | 628 | sv_wait(&iclog->ic_force_wait, PMEM, |
1da177e4 LT |
629 | &log->l_icloglock, s); |
630 | } else { | |
b22cd72c | 631 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
632 | } |
633 | } | |
634 | ||
1bb7d6b5 | 635 | return error; |
1da177e4 LT |
636 | } /* xfs_log_unmount_write */ |
637 | ||
638 | /* | |
639 | * Deallocate log structures for unmount/relocation. | |
249a8c11 DC |
640 | * |
641 | * We need to stop the aild from running before we destroy | |
642 | * and deallocate the log as the aild references the log. | |
1da177e4 LT |
643 | */ |
644 | void | |
21b699c8 | 645 | xfs_log_unmount(xfs_mount_t *mp) |
1da177e4 | 646 | { |
249a8c11 | 647 | xfs_trans_ail_destroy(mp); |
c41564b5 | 648 | xlog_dealloc_log(mp->m_log); |
1da177e4 LT |
649 | } |
650 | ||
651 | /* | |
652 | * Write region vectors to log. The write happens using the space reservation | |
653 | * of the ticket (tic). It is not a requirement that all writes for a given | |
654 | * transaction occur with one call to xfs_log_write(). | |
655 | */ | |
656 | int | |
35a8a72f CH |
657 | xfs_log_write( |
658 | struct xfs_mount *mp, | |
659 | struct xfs_log_iovec reg[], | |
660 | int nentries, | |
661 | struct xlog_ticket *tic, | |
662 | xfs_lsn_t *start_lsn) | |
1da177e4 | 663 | { |
35a8a72f CH |
664 | struct log *log = mp->m_log; |
665 | int error; | |
1da177e4 | 666 | |
1da177e4 LT |
667 | if (XLOG_FORCED_SHUTDOWN(log)) |
668 | return XFS_ERROR(EIO); | |
669 | ||
35a8a72f CH |
670 | error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0); |
671 | if (error) | |
7d04a335 | 672 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 673 | return error; |
35a8a72f | 674 | } |
1da177e4 LT |
675 | |
676 | void | |
677 | xfs_log_move_tail(xfs_mount_t *mp, | |
678 | xfs_lsn_t tail_lsn) | |
679 | { | |
680 | xlog_ticket_t *tic; | |
681 | xlog_t *log = mp->m_log; | |
682 | int need_bytes, free_bytes, cycle, bytes; | |
1da177e4 | 683 | |
1da177e4 LT |
684 | if (XLOG_FORCED_SHUTDOWN(log)) |
685 | return; | |
1da177e4 LT |
686 | |
687 | if (tail_lsn == 0) { | |
688 | /* needed since sync_lsn is 64 bits */ | |
b22cd72c | 689 | spin_lock(&log->l_icloglock); |
1da177e4 | 690 | tail_lsn = log->l_last_sync_lsn; |
b22cd72c | 691 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
692 | } |
693 | ||
c8b5ea28 | 694 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
695 | |
696 | /* Also an invalid lsn. 1 implies that we aren't passing in a valid | |
697 | * tail_lsn. | |
698 | */ | |
699 | if (tail_lsn != 1) { | |
700 | log->l_tail_lsn = tail_lsn; | |
701 | } | |
702 | ||
703 | if ((tic = log->l_write_headq)) { | |
704 | #ifdef DEBUG | |
705 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
706 | panic("Recovery problem"); | |
707 | #endif | |
708 | cycle = log->l_grant_write_cycle; | |
709 | bytes = log->l_grant_write_bytes; | |
710 | free_bytes = xlog_space_left(log, cycle, bytes); | |
711 | do { | |
712 | ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); | |
713 | ||
714 | if (free_bytes < tic->t_unit_res && tail_lsn != 1) | |
715 | break; | |
716 | tail_lsn = 0; | |
717 | free_bytes -= tic->t_unit_res; | |
12017faf | 718 | sv_signal(&tic->t_wait); |
1da177e4 LT |
719 | tic = tic->t_next; |
720 | } while (tic != log->l_write_headq); | |
721 | } | |
722 | if ((tic = log->l_reserve_headq)) { | |
723 | #ifdef DEBUG | |
724 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
725 | panic("Recovery problem"); | |
726 | #endif | |
727 | cycle = log->l_grant_reserve_cycle; | |
728 | bytes = log->l_grant_reserve_bytes; | |
729 | free_bytes = xlog_space_left(log, cycle, bytes); | |
730 | do { | |
731 | if (tic->t_flags & XLOG_TIC_PERM_RESERV) | |
732 | need_bytes = tic->t_unit_res*tic->t_cnt; | |
733 | else | |
734 | need_bytes = tic->t_unit_res; | |
735 | if (free_bytes < need_bytes && tail_lsn != 1) | |
736 | break; | |
737 | tail_lsn = 0; | |
738 | free_bytes -= need_bytes; | |
12017faf | 739 | sv_signal(&tic->t_wait); |
1da177e4 LT |
740 | tic = tic->t_next; |
741 | } while (tic != log->l_reserve_headq); | |
742 | } | |
c8b5ea28 | 743 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
744 | } /* xfs_log_move_tail */ |
745 | ||
746 | /* | |
747 | * Determine if we have a transaction that has gone to disk | |
748 | * that needs to be covered. Log activity needs to be idle (no AIL and | |
749 | * nothing in the iclogs). And, we need to be in the right state indicating | |
750 | * something has gone out. | |
751 | */ | |
752 | int | |
753 | xfs_log_need_covered(xfs_mount_t *mp) | |
754 | { | |
27d8d5fe | 755 | int needed = 0; |
1da177e4 | 756 | xlog_t *log = mp->m_log; |
1da177e4 | 757 | |
92821e2b | 758 | if (!xfs_fs_writable(mp)) |
1da177e4 LT |
759 | return 0; |
760 | ||
b22cd72c | 761 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
762 | if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || |
763 | (log->l_covered_state == XLOG_STATE_COVER_NEED2)) | |
a9c21c1b | 764 | && !xfs_trans_ail_tail(log->l_ailp) |
1da177e4 LT |
765 | && xlog_iclogs_empty(log)) { |
766 | if (log->l_covered_state == XLOG_STATE_COVER_NEED) | |
767 | log->l_covered_state = XLOG_STATE_COVER_DONE; | |
768 | else { | |
769 | ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); | |
770 | log->l_covered_state = XLOG_STATE_COVER_DONE2; | |
771 | } | |
772 | needed = 1; | |
773 | } | |
b22cd72c | 774 | spin_unlock(&log->l_icloglock); |
014c2544 | 775 | return needed; |
1da177e4 LT |
776 | } |
777 | ||
778 | /****************************************************************************** | |
779 | * | |
780 | * local routines | |
781 | * | |
782 | ****************************************************************************** | |
783 | */ | |
784 | ||
785 | /* xfs_trans_tail_ail returns 0 when there is nothing in the list. | |
786 | * The log manager must keep track of the last LR which was committed | |
787 | * to disk. The lsn of this LR will become the new tail_lsn whenever | |
788 | * xfs_trans_tail_ail returns 0. If we don't do this, we run into | |
789 | * the situation where stuff could be written into the log but nothing | |
790 | * was ever in the AIL when asked. Eventually, we panic since the | |
791 | * tail hits the head. | |
792 | * | |
793 | * We may be holding the log iclog lock upon entering this routine. | |
794 | */ | |
795 | xfs_lsn_t | |
796 | xlog_assign_tail_lsn(xfs_mount_t *mp) | |
797 | { | |
798 | xfs_lsn_t tail_lsn; | |
1da177e4 LT |
799 | xlog_t *log = mp->m_log; |
800 | ||
5b00f14f | 801 | tail_lsn = xfs_trans_ail_tail(mp->m_ail); |
c8b5ea28 | 802 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
803 | if (tail_lsn != 0) { |
804 | log->l_tail_lsn = tail_lsn; | |
805 | } else { | |
806 | tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; | |
807 | } | |
c8b5ea28 | 808 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
809 | |
810 | return tail_lsn; | |
811 | } /* xlog_assign_tail_lsn */ | |
812 | ||
813 | ||
814 | /* | |
815 | * Return the space in the log between the tail and the head. The head | |
816 | * is passed in the cycle/bytes formal parms. In the special case where | |
817 | * the reserve head has wrapped passed the tail, this calculation is no | |
818 | * longer valid. In this case, just return 0 which means there is no space | |
819 | * in the log. This works for all places where this function is called | |
820 | * with the reserve head. Of course, if the write head were to ever | |
821 | * wrap the tail, we should blow up. Rather than catch this case here, | |
822 | * we depend on other ASSERTions in other parts of the code. XXXmiken | |
823 | * | |
824 | * This code also handles the case where the reservation head is behind | |
825 | * the tail. The details of this case are described below, but the end | |
826 | * result is that we return the size of the log as the amount of space left. | |
827 | */ | |
a8272ce0 | 828 | STATIC int |
1da177e4 LT |
829 | xlog_space_left(xlog_t *log, int cycle, int bytes) |
830 | { | |
831 | int free_bytes; | |
832 | int tail_bytes; | |
833 | int tail_cycle; | |
834 | ||
835 | tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); | |
836 | tail_cycle = CYCLE_LSN(log->l_tail_lsn); | |
837 | if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { | |
838 | free_bytes = log->l_logsize - (bytes - tail_bytes); | |
839 | } else if ((tail_cycle + 1) < cycle) { | |
840 | return 0; | |
841 | } else if (tail_cycle < cycle) { | |
842 | ASSERT(tail_cycle == (cycle - 1)); | |
843 | free_bytes = tail_bytes - bytes; | |
844 | } else { | |
845 | /* | |
846 | * The reservation head is behind the tail. | |
847 | * In this case we just want to return the size of the | |
848 | * log as the amount of space left. | |
849 | */ | |
850 | xfs_fs_cmn_err(CE_ALERT, log->l_mp, | |
851 | "xlog_space_left: head behind tail\n" | |
852 | " tail_cycle = %d, tail_bytes = %d\n" | |
853 | " GH cycle = %d, GH bytes = %d", | |
854 | tail_cycle, tail_bytes, cycle, bytes); | |
855 | ASSERT(0); | |
856 | free_bytes = log->l_logsize; | |
857 | } | |
858 | return free_bytes; | |
859 | } /* xlog_space_left */ | |
860 | ||
861 | ||
862 | /* | |
863 | * Log function which is called when an io completes. | |
864 | * | |
865 | * The log manager needs its own routine, in order to control what | |
866 | * happens with the buffer after the write completes. | |
867 | */ | |
868 | void | |
869 | xlog_iodone(xfs_buf_t *bp) | |
870 | { | |
871 | xlog_in_core_t *iclog; | |
872 | xlog_t *l; | |
873 | int aborted; | |
874 | ||
875 | iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); | |
876 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); | |
877 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); | |
878 | aborted = 0; | |
1da177e4 LT |
879 | l = iclog->ic_log; |
880 | ||
0bfefc46 | 881 | /* |
73f6aa4d CH |
882 | * If the _XFS_BARRIER_FAILED flag was set by a lower |
883 | * layer, it means the underlying device no longer supports | |
0bfefc46 DC |
884 | * barrier I/O. Warn loudly and turn off barriers. |
885 | */ | |
73f6aa4d CH |
886 | if (bp->b_flags & _XFS_BARRIER_FAILED) { |
887 | bp->b_flags &= ~_XFS_BARRIER_FAILED; | |
0bfefc46 DC |
888 | l->l_mp->m_flags &= ~XFS_MOUNT_BARRIER; |
889 | xfs_fs_cmn_err(CE_WARN, l->l_mp, | |
890 | "xlog_iodone: Barriers are no longer supported" | |
891 | " by device. Disabling barriers\n"); | |
0bfefc46 DC |
892 | } |
893 | ||
1da177e4 LT |
894 | /* |
895 | * Race to shutdown the filesystem if we see an error. | |
896 | */ | |
897 | if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, | |
898 | XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { | |
899 | xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); | |
900 | XFS_BUF_STALE(bp); | |
7d04a335 | 901 | xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 LT |
902 | /* |
903 | * This flag will be propagated to the trans-committed | |
904 | * callback routines to let them know that the log-commit | |
905 | * didn't succeed. | |
906 | */ | |
907 | aborted = XFS_LI_ABORTED; | |
908 | } else if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
909 | aborted = XFS_LI_ABORTED; | |
910 | } | |
3db296f3 DC |
911 | |
912 | /* log I/O is always issued ASYNC */ | |
913 | ASSERT(XFS_BUF_ISASYNC(bp)); | |
1da177e4 | 914 | xlog_state_done_syncing(iclog, aborted); |
3db296f3 DC |
915 | /* |
916 | * do not reference the buffer (bp) here as we could race | |
917 | * with it being freed after writing the unmount record to the | |
918 | * log. | |
919 | */ | |
920 | ||
1da177e4 LT |
921 | } /* xlog_iodone */ |
922 | ||
1da177e4 LT |
923 | /* |
924 | * Return size of each in-core log record buffer. | |
925 | * | |
9da096fd | 926 | * All machines get 8 x 32kB buffers by default, unless tuned otherwise. |
1da177e4 LT |
927 | * |
928 | * If the filesystem blocksize is too large, we may need to choose a | |
929 | * larger size since the directory code currently logs entire blocks. | |
930 | */ | |
931 | ||
932 | STATIC void | |
933 | xlog_get_iclog_buffer_size(xfs_mount_t *mp, | |
934 | xlog_t *log) | |
935 | { | |
936 | int size; | |
937 | int xhdrs; | |
938 | ||
1cb51258 ES |
939 | if (mp->m_logbufs <= 0) |
940 | log->l_iclog_bufs = XLOG_MAX_ICLOGS; | |
941 | else | |
cfcbbbd0 | 942 | log->l_iclog_bufs = mp->m_logbufs; |
1da177e4 LT |
943 | |
944 | /* | |
945 | * Buffer size passed in from mount system call. | |
946 | */ | |
cfcbbbd0 | 947 | if (mp->m_logbsize > 0) { |
1da177e4 LT |
948 | size = log->l_iclog_size = mp->m_logbsize; |
949 | log->l_iclog_size_log = 0; | |
950 | while (size != 1) { | |
951 | log->l_iclog_size_log++; | |
952 | size >>= 1; | |
953 | } | |
954 | ||
62118709 | 955 | if (xfs_sb_version_haslogv2(&mp->m_sb)) { |
9da096fd MP |
956 | /* # headers = size / 32k |
957 | * one header holds cycles from 32k of data | |
1da177e4 LT |
958 | */ |
959 | ||
960 | xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; | |
961 | if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) | |
962 | xhdrs++; | |
963 | log->l_iclog_hsize = xhdrs << BBSHIFT; | |
964 | log->l_iclog_heads = xhdrs; | |
965 | } else { | |
966 | ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); | |
967 | log->l_iclog_hsize = BBSIZE; | |
968 | log->l_iclog_heads = 1; | |
969 | } | |
cfcbbbd0 | 970 | goto done; |
1da177e4 LT |
971 | } |
972 | ||
9da096fd | 973 | /* All machines use 32kB buffers by default. */ |
1cb51258 ES |
974 | log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; |
975 | log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; | |
1da177e4 LT |
976 | |
977 | /* the default log size is 16k or 32k which is one header sector */ | |
978 | log->l_iclog_hsize = BBSIZE; | |
979 | log->l_iclog_heads = 1; | |
980 | ||
7153f8ba CH |
981 | done: |
982 | /* are we being asked to make the sizes selected above visible? */ | |
cfcbbbd0 NS |
983 | if (mp->m_logbufs == 0) |
984 | mp->m_logbufs = log->l_iclog_bufs; | |
985 | if (mp->m_logbsize == 0) | |
986 | mp->m_logbsize = log->l_iclog_size; | |
1da177e4 LT |
987 | } /* xlog_get_iclog_buffer_size */ |
988 | ||
989 | ||
990 | /* | |
991 | * This routine initializes some of the log structure for a given mount point. | |
992 | * Its primary purpose is to fill in enough, so recovery can occur. However, | |
993 | * some other stuff may be filled in too. | |
994 | */ | |
995 | STATIC xlog_t * | |
996 | xlog_alloc_log(xfs_mount_t *mp, | |
997 | xfs_buftarg_t *log_target, | |
998 | xfs_daddr_t blk_offset, | |
999 | int num_bblks) | |
1000 | { | |
1001 | xlog_t *log; | |
1002 | xlog_rec_header_t *head; | |
1003 | xlog_in_core_t **iclogp; | |
1004 | xlog_in_core_t *iclog, *prev_iclog=NULL; | |
1005 | xfs_buf_t *bp; | |
1006 | int i; | |
1007 | int iclogsize; | |
a6cb767e | 1008 | int error = ENOMEM; |
1da177e4 | 1009 | |
644c3567 | 1010 | log = kmem_zalloc(sizeof(xlog_t), KM_MAYFAIL); |
a6cb767e DC |
1011 | if (!log) { |
1012 | xlog_warn("XFS: Log allocation failed: No memory!"); | |
1013 | goto out; | |
1014 | } | |
1da177e4 LT |
1015 | |
1016 | log->l_mp = mp; | |
1017 | log->l_targ = log_target; | |
1018 | log->l_logsize = BBTOB(num_bblks); | |
1019 | log->l_logBBstart = blk_offset; | |
1020 | log->l_logBBsize = num_bblks; | |
1021 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1022 | log->l_flags |= XLOG_ACTIVE_RECOVERY; | |
1023 | ||
1024 | log->l_prev_block = -1; | |
03bea6fe | 1025 | log->l_tail_lsn = xlog_assign_lsn(1, 0); |
1da177e4 LT |
1026 | /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ |
1027 | log->l_last_sync_lsn = log->l_tail_lsn; | |
1028 | log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ | |
1029 | log->l_grant_reserve_cycle = 1; | |
1030 | log->l_grant_write_cycle = 1; | |
1031 | ||
a6cb767e | 1032 | error = EFSCORRUPTED; |
62118709 | 1033 | if (xfs_sb_version_hassector(&mp->m_sb)) { |
1da177e4 | 1034 | log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; |
a6cb767e DC |
1035 | if (log->l_sectbb_log < 0 || |
1036 | log->l_sectbb_log > mp->m_sectbb_log) { | |
1037 | xlog_warn("XFS: Log sector size (0x%x) out of range.", | |
1038 | log->l_sectbb_log); | |
1039 | goto out_free_log; | |
1040 | } | |
1041 | ||
1da177e4 | 1042 | /* for larger sector sizes, must have v2 or external log */ |
a6cb767e DC |
1043 | if (log->l_sectbb_log != 0 && |
1044 | (log->l_logBBstart != 0 && | |
1045 | !xfs_sb_version_haslogv2(&mp->m_sb))) { | |
1046 | xlog_warn("XFS: log sector size (0x%x) invalid " | |
1047 | "for configuration.", log->l_sectbb_log); | |
1048 | goto out_free_log; | |
1049 | } | |
1050 | if (mp->m_sb.sb_logsectlog < BBSHIFT) { | |
1051 | xlog_warn("XFS: Log sector log (0x%x) too small.", | |
1052 | mp->m_sb.sb_logsectlog); | |
1053 | goto out_free_log; | |
1054 | } | |
1da177e4 LT |
1055 | } |
1056 | log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; | |
1057 | ||
1058 | xlog_get_iclog_buffer_size(mp, log); | |
1059 | ||
a6cb767e | 1060 | error = ENOMEM; |
1da177e4 | 1061 | bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); |
644c3567 DC |
1062 | if (!bp) |
1063 | goto out_free_log; | |
1da177e4 | 1064 | XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); |
1da177e4 LT |
1065 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); |
1066 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
1067 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
1068 | log->l_xbuf = bp; | |
1069 | ||
007c61c6 ES |
1070 | spin_lock_init(&log->l_icloglock); |
1071 | spin_lock_init(&log->l_grant_lock); | |
d748c623 | 1072 | sv_init(&log->l_flush_wait, 0, "flush_wait"); |
1da177e4 LT |
1073 | |
1074 | /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ | |
1075 | ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); | |
1076 | ||
1077 | iclogp = &log->l_iclog; | |
1078 | /* | |
1079 | * The amount of memory to allocate for the iclog structure is | |
1080 | * rather funky due to the way the structure is defined. It is | |
1081 | * done this way so that we can use different sizes for machines | |
1082 | * with different amounts of memory. See the definition of | |
1083 | * xlog_in_core_t in xfs_log_priv.h for details. | |
1084 | */ | |
1085 | iclogsize = log->l_iclog_size; | |
1086 | ASSERT(log->l_iclog_size >= 4096); | |
1087 | for (i=0; i < log->l_iclog_bufs; i++) { | |
644c3567 DC |
1088 | *iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL); |
1089 | if (!*iclogp) | |
1090 | goto out_free_iclog; | |
1091 | ||
1da177e4 | 1092 | iclog = *iclogp; |
1da177e4 LT |
1093 | iclog->ic_prev = prev_iclog; |
1094 | prev_iclog = iclog; | |
1fa40b01 CH |
1095 | |
1096 | bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp); | |
644c3567 DC |
1097 | if (!bp) |
1098 | goto out_free_iclog; | |
1fa40b01 CH |
1099 | if (!XFS_BUF_CPSEMA(bp)) |
1100 | ASSERT(0); | |
1101 | XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); | |
1fa40b01 CH |
1102 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); |
1103 | iclog->ic_bp = bp; | |
b28708d6 | 1104 | iclog->ic_data = bp->b_addr; |
4679b2d3 | 1105 | #ifdef DEBUG |
1da177e4 | 1106 | log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); |
4679b2d3 | 1107 | #endif |
1da177e4 LT |
1108 | head = &iclog->ic_header; |
1109 | memset(head, 0, sizeof(xlog_rec_header_t)); | |
b53e675d CH |
1110 | head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); |
1111 | head->h_version = cpu_to_be32( | |
62118709 | 1112 | xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); |
b53e675d | 1113 | head->h_size = cpu_to_be32(log->l_iclog_size); |
1da177e4 | 1114 | /* new fields */ |
b53e675d | 1115 | head->h_fmt = cpu_to_be32(XLOG_FMT); |
1da177e4 LT |
1116 | memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); |
1117 | ||
1da177e4 LT |
1118 | iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; |
1119 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
1120 | iclog->ic_log = log; | |
114d23aa DC |
1121 | atomic_set(&iclog->ic_refcnt, 0); |
1122 | spin_lock_init(&iclog->ic_callback_lock); | |
1da177e4 | 1123 | iclog->ic_callback_tail = &(iclog->ic_callback); |
b28708d6 | 1124 | iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; |
1da177e4 LT |
1125 | |
1126 | ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); | |
1127 | ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); | |
12017faf DC |
1128 | sv_init(&iclog->ic_force_wait, SV_DEFAULT, "iclog-force"); |
1129 | sv_init(&iclog->ic_write_wait, SV_DEFAULT, "iclog-write"); | |
1da177e4 LT |
1130 | |
1131 | iclogp = &iclog->ic_next; | |
1132 | } | |
1133 | *iclogp = log->l_iclog; /* complete ring */ | |
1134 | log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ | |
1135 | ||
1136 | return log; | |
644c3567 DC |
1137 | |
1138 | out_free_iclog: | |
1139 | for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { | |
1140 | prev_iclog = iclog->ic_next; | |
1141 | if (iclog->ic_bp) { | |
1142 | sv_destroy(&iclog->ic_force_wait); | |
1143 | sv_destroy(&iclog->ic_write_wait); | |
1144 | xfs_buf_free(iclog->ic_bp); | |
644c3567 DC |
1145 | } |
1146 | kmem_free(iclog); | |
1147 | } | |
1148 | spinlock_destroy(&log->l_icloglock); | |
1149 | spinlock_destroy(&log->l_grant_lock); | |
644c3567 DC |
1150 | xfs_buf_free(log->l_xbuf); |
1151 | out_free_log: | |
1152 | kmem_free(log); | |
a6cb767e DC |
1153 | out: |
1154 | return ERR_PTR(-error); | |
1da177e4 LT |
1155 | } /* xlog_alloc_log */ |
1156 | ||
1157 | ||
1158 | /* | |
1159 | * Write out the commit record of a transaction associated with the given | |
1160 | * ticket. Return the lsn of the commit record. | |
1161 | */ | |
1162 | STATIC int | |
1163 | xlog_commit_record(xfs_mount_t *mp, | |
1164 | xlog_ticket_t *ticket, | |
1165 | xlog_in_core_t **iclog, | |
1166 | xfs_lsn_t *commitlsnp) | |
1167 | { | |
1168 | int error; | |
1169 | xfs_log_iovec_t reg[1]; | |
1170 | ||
1171 | reg[0].i_addr = NULL; | |
1172 | reg[0].i_len = 0; | |
4139b3b3 | 1173 | reg[0].i_type = XLOG_REG_TYPE_COMMIT; |
1da177e4 LT |
1174 | |
1175 | ASSERT_ALWAYS(iclog); | |
1176 | if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, | |
1177 | iclog, XLOG_COMMIT_TRANS))) { | |
7d04a335 | 1178 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 | 1179 | } |
014c2544 | 1180 | return error; |
1da177e4 LT |
1181 | } /* xlog_commit_record */ |
1182 | ||
1183 | ||
1184 | /* | |
1185 | * Push on the buffer cache code if we ever use more than 75% of the on-disk | |
1186 | * log space. This code pushes on the lsn which would supposedly free up | |
1187 | * the 25% which we want to leave free. We may need to adopt a policy which | |
1188 | * pushes on an lsn which is further along in the log once we reach the high | |
1189 | * water mark. In this manner, we would be creating a low water mark. | |
1190 | */ | |
a8272ce0 | 1191 | STATIC void |
1da177e4 LT |
1192 | xlog_grant_push_ail(xfs_mount_t *mp, |
1193 | int need_bytes) | |
1194 | { | |
1195 | xlog_t *log = mp->m_log; /* pointer to the log */ | |
1196 | xfs_lsn_t tail_lsn; /* lsn of the log tail */ | |
1197 | xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ | |
1198 | int free_blocks; /* free blocks left to write to */ | |
1199 | int free_bytes; /* free bytes left to write to */ | |
1200 | int threshold_block; /* block in lsn we'd like to be at */ | |
1201 | int threshold_cycle; /* lsn cycle we'd like to be at */ | |
1202 | int free_threshold; | |
1da177e4 LT |
1203 | |
1204 | ASSERT(BTOBB(need_bytes) < log->l_logBBsize); | |
1205 | ||
c8b5ea28 | 1206 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
1207 | free_bytes = xlog_space_left(log, |
1208 | log->l_grant_reserve_cycle, | |
1209 | log->l_grant_reserve_bytes); | |
1210 | tail_lsn = log->l_tail_lsn; | |
1211 | free_blocks = BTOBBT(free_bytes); | |
1212 | ||
1213 | /* | |
1214 | * Set the threshold for the minimum number of free blocks in the | |
1215 | * log to the maximum of what the caller needs, one quarter of the | |
1216 | * log, and 256 blocks. | |
1217 | */ | |
1218 | free_threshold = BTOBB(need_bytes); | |
1219 | free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); | |
1220 | free_threshold = MAX(free_threshold, 256); | |
1221 | if (free_blocks < free_threshold) { | |
1222 | threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; | |
1223 | threshold_cycle = CYCLE_LSN(tail_lsn); | |
1224 | if (threshold_block >= log->l_logBBsize) { | |
1225 | threshold_block -= log->l_logBBsize; | |
1226 | threshold_cycle += 1; | |
1227 | } | |
03bea6fe | 1228 | threshold_lsn = xlog_assign_lsn(threshold_cycle, threshold_block); |
1da177e4 LT |
1229 | |
1230 | /* Don't pass in an lsn greater than the lsn of the last | |
1231 | * log record known to be on disk. | |
1232 | */ | |
1233 | if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) | |
1234 | threshold_lsn = log->l_last_sync_lsn; | |
1235 | } | |
c8b5ea28 | 1236 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
1237 | |
1238 | /* | |
1239 | * Get the transaction layer to kick the dirty buffers out to | |
1240 | * disk asynchronously. No point in trying to do this if | |
1241 | * the filesystem is shutting down. | |
1242 | */ | |
1243 | if (threshold_lsn && | |
1244 | !XLOG_FORCED_SHUTDOWN(log)) | |
783a2f65 | 1245 | xfs_trans_ail_push(log->l_ailp, threshold_lsn); |
1da177e4 LT |
1246 | } /* xlog_grant_push_ail */ |
1247 | ||
873ff550 CH |
1248 | /* |
1249 | * The bdstrat callback function for log bufs. This gives us a central | |
1250 | * place to trap bufs in case we get hit by a log I/O error and need to | |
1251 | * shutdown. Actually, in practice, even when we didn't get a log error, | |
1252 | * we transition the iclogs to IOERROR state *after* flushing all existing | |
1253 | * iclogs to disk. This is because we don't want anymore new transactions to be | |
1254 | * started or completed afterwards. | |
1255 | */ | |
1256 | STATIC int | |
1257 | xlog_bdstrat( | |
1258 | struct xfs_buf *bp) | |
1259 | { | |
1260 | struct xlog_in_core *iclog; | |
1261 | ||
1262 | iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); | |
1263 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
1264 | XFS_BUF_ERROR(bp, EIO); | |
1265 | XFS_BUF_STALE(bp); | |
1266 | xfs_biodone(bp); | |
1267 | /* | |
1268 | * It would seem logical to return EIO here, but we rely on | |
1269 | * the log state machine to propagate I/O errors instead of | |
1270 | * doing it here. | |
1271 | */ | |
1272 | return 0; | |
1273 | } | |
1274 | ||
1275 | bp->b_flags |= _XBF_RUN_QUEUES; | |
1276 | xfs_buf_iorequest(bp); | |
1277 | return 0; | |
1278 | } | |
1da177e4 LT |
1279 | |
1280 | /* | |
1281 | * Flush out the in-core log (iclog) to the on-disk log in an asynchronous | |
1282 | * fashion. Previously, we should have moved the current iclog | |
1283 | * ptr in the log to point to the next available iclog. This allows further | |
1284 | * write to continue while this code syncs out an iclog ready to go. | |
1285 | * Before an in-core log can be written out, the data section must be scanned | |
1286 | * to save away the 1st word of each BBSIZE block into the header. We replace | |
1287 | * it with the current cycle count. Each BBSIZE block is tagged with the | |
1288 | * cycle count because there in an implicit assumption that drives will | |
1289 | * guarantee that entire 512 byte blocks get written at once. In other words, | |
1290 | * we can't have part of a 512 byte block written and part not written. By | |
1291 | * tagging each block, we will know which blocks are valid when recovering | |
1292 | * after an unclean shutdown. | |
1293 | * | |
1294 | * This routine is single threaded on the iclog. No other thread can be in | |
1295 | * this routine with the same iclog. Changing contents of iclog can there- | |
1296 | * fore be done without grabbing the state machine lock. Updating the global | |
1297 | * log will require grabbing the lock though. | |
1298 | * | |
1299 | * The entire log manager uses a logical block numbering scheme. Only | |
1300 | * log_sync (and then only bwrite()) know about the fact that the log may | |
1301 | * not start with block zero on a given device. The log block start offset | |
1302 | * is added immediately before calling bwrite(). | |
1303 | */ | |
1304 | ||
a8272ce0 | 1305 | STATIC int |
1da177e4 LT |
1306 | xlog_sync(xlog_t *log, |
1307 | xlog_in_core_t *iclog) | |
1308 | { | |
1309 | xfs_caddr_t dptr; /* pointer to byte sized element */ | |
1310 | xfs_buf_t *bp; | |
b53e675d | 1311 | int i; |
1da177e4 LT |
1312 | uint count; /* byte count of bwrite */ |
1313 | uint count_init; /* initial count before roundup */ | |
1314 | int roundoff; /* roundoff to BB or stripe */ | |
1315 | int split = 0; /* split write into two regions */ | |
1316 | int error; | |
62118709 | 1317 | int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb); |
1da177e4 LT |
1318 | |
1319 | XFS_STATS_INC(xs_log_writes); | |
155cc6b7 | 1320 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
1321 | |
1322 | /* Add for LR header */ | |
1323 | count_init = log->l_iclog_hsize + iclog->ic_offset; | |
1324 | ||
1325 | /* Round out the log write size */ | |
1326 | if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { | |
1327 | /* we have a v2 stripe unit to use */ | |
1328 | count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); | |
1329 | } else { | |
1330 | count = BBTOB(BTOBB(count_init)); | |
1331 | } | |
1332 | roundoff = count - count_init; | |
1333 | ASSERT(roundoff >= 0); | |
1334 | ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && | |
1335 | roundoff < log->l_mp->m_sb.sb_logsunit) | |
1336 | || | |
1337 | (log->l_mp->m_sb.sb_logsunit <= 1 && | |
1338 | roundoff < BBTOB(1))); | |
1339 | ||
1340 | /* move grant heads by roundoff in sync */ | |
c8b5ea28 | 1341 | spin_lock(&log->l_grant_lock); |
dd954c69 | 1342 | xlog_grant_add_space(log, roundoff); |
c8b5ea28 | 1343 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
1344 | |
1345 | /* put cycle number in every block */ | |
1346 | xlog_pack_data(log, iclog, roundoff); | |
1347 | ||
1348 | /* real byte length */ | |
1349 | if (v2) { | |
b53e675d CH |
1350 | iclog->ic_header.h_len = |
1351 | cpu_to_be32(iclog->ic_offset + roundoff); | |
1da177e4 | 1352 | } else { |
b53e675d CH |
1353 | iclog->ic_header.h_len = |
1354 | cpu_to_be32(iclog->ic_offset); | |
1da177e4 LT |
1355 | } |
1356 | ||
f5faad79 | 1357 | bp = iclog->ic_bp; |
1da177e4 LT |
1358 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); |
1359 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); | |
b53e675d | 1360 | XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn))); |
1da177e4 LT |
1361 | |
1362 | XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); | |
1363 | ||
1364 | /* Do we need to split this write into 2 parts? */ | |
1365 | if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { | |
1366 | split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); | |
1367 | count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); | |
1368 | iclog->ic_bwritecnt = 2; /* split into 2 writes */ | |
1369 | } else { | |
1370 | iclog->ic_bwritecnt = 1; | |
1371 | } | |
511105b3 | 1372 | XFS_BUF_SET_COUNT(bp, count); |
1da177e4 | 1373 | XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ |
f5faad79 | 1374 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 LT |
1375 | XFS_BUF_BUSY(bp); |
1376 | XFS_BUF_ASYNC(bp); | |
2ee1abad | 1377 | bp->b_flags |= XBF_LOG_BUFFER; |
1da177e4 | 1378 | /* |
f538d4da | 1379 | * Do an ordered write for the log block. |
f5faad79 | 1380 | * Its unnecessary to flush the first split block in the log wrap case. |
1da177e4 | 1381 | */ |
f5faad79 | 1382 | if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER)) |
f538d4da | 1383 | XFS_BUF_ORDERED(bp); |
1da177e4 LT |
1384 | |
1385 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1386 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1387 | ||
1388 | xlog_verify_iclog(log, iclog, count, B_TRUE); | |
1389 | ||
1390 | /* account for log which doesn't start at block #0 */ | |
1391 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); | |
1392 | /* | |
1393 | * Don't call xfs_bwrite here. We do log-syncs even when the filesystem | |
1394 | * is shutting down. | |
1395 | */ | |
1396 | XFS_BUF_WRITE(bp); | |
1397 | ||
873ff550 | 1398 | if ((error = xlog_bdstrat(bp))) { |
1da177e4 LT |
1399 | xfs_ioerror_alert("xlog_sync", log->l_mp, bp, |
1400 | XFS_BUF_ADDR(bp)); | |
014c2544 | 1401 | return error; |
1da177e4 LT |
1402 | } |
1403 | if (split) { | |
f5faad79 | 1404 | bp = iclog->ic_log->l_xbuf; |
1da177e4 LT |
1405 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == |
1406 | (unsigned long)1); | |
1407 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); | |
1408 | XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ | |
1409 | XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ | |
1410 | (__psint_t)count), split); | |
1411 | XFS_BUF_SET_FSPRIVATE(bp, iclog); | |
f5faad79 | 1412 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 LT |
1413 | XFS_BUF_BUSY(bp); |
1414 | XFS_BUF_ASYNC(bp); | |
2ee1abad | 1415 | bp->b_flags |= XBF_LOG_BUFFER; |
f538d4da CH |
1416 | if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) |
1417 | XFS_BUF_ORDERED(bp); | |
1da177e4 LT |
1418 | dptr = XFS_BUF_PTR(bp); |
1419 | /* | |
1420 | * Bump the cycle numbers at the start of each block | |
1421 | * since this part of the buffer is at the start of | |
1422 | * a new cycle. Watch out for the header magic number | |
1423 | * case, though. | |
1424 | */ | |
b53e675d | 1425 | for (i = 0; i < split; i += BBSIZE) { |
413d57c9 | 1426 | be32_add_cpu((__be32 *)dptr, 1); |
b53e675d | 1427 | if (be32_to_cpu(*(__be32 *)dptr) == XLOG_HEADER_MAGIC_NUM) |
413d57c9 | 1428 | be32_add_cpu((__be32 *)dptr, 1); |
1da177e4 LT |
1429 | dptr += BBSIZE; |
1430 | } | |
1431 | ||
1432 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1433 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1434 | ||
c41564b5 | 1435 | /* account for internal log which doesn't start at block #0 */ |
1da177e4 LT |
1436 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); |
1437 | XFS_BUF_WRITE(bp); | |
873ff550 | 1438 | if ((error = xlog_bdstrat(bp))) { |
1da177e4 LT |
1439 | xfs_ioerror_alert("xlog_sync (split)", log->l_mp, |
1440 | bp, XFS_BUF_ADDR(bp)); | |
014c2544 | 1441 | return error; |
1da177e4 LT |
1442 | } |
1443 | } | |
014c2544 | 1444 | return 0; |
1da177e4 LT |
1445 | } /* xlog_sync */ |
1446 | ||
1447 | ||
1448 | /* | |
c41564b5 | 1449 | * Deallocate a log structure |
1da177e4 | 1450 | */ |
a8272ce0 | 1451 | STATIC void |
c41564b5 | 1452 | xlog_dealloc_log(xlog_t *log) |
1da177e4 LT |
1453 | { |
1454 | xlog_in_core_t *iclog, *next_iclog; | |
1da177e4 LT |
1455 | int i; |
1456 | ||
1da177e4 LT |
1457 | iclog = log->l_iclog; |
1458 | for (i=0; i<log->l_iclog_bufs; i++) { | |
12017faf DC |
1459 | sv_destroy(&iclog->ic_force_wait); |
1460 | sv_destroy(&iclog->ic_write_wait); | |
1da177e4 | 1461 | xfs_buf_free(iclog->ic_bp); |
1da177e4 | 1462 | next_iclog = iclog->ic_next; |
f0e2d93c | 1463 | kmem_free(iclog); |
1da177e4 LT |
1464 | iclog = next_iclog; |
1465 | } | |
1da177e4 LT |
1466 | spinlock_destroy(&log->l_icloglock); |
1467 | spinlock_destroy(&log->l_grant_lock); | |
1468 | ||
1da177e4 | 1469 | xfs_buf_free(log->l_xbuf); |
1da177e4 | 1470 | log->l_mp->m_log = NULL; |
f0e2d93c | 1471 | kmem_free(log); |
c41564b5 | 1472 | } /* xlog_dealloc_log */ |
1da177e4 LT |
1473 | |
1474 | /* | |
1475 | * Update counters atomically now that memcpy is done. | |
1476 | */ | |
1477 | /* ARGSUSED */ | |
1478 | static inline void | |
1479 | xlog_state_finish_copy(xlog_t *log, | |
1480 | xlog_in_core_t *iclog, | |
1481 | int record_cnt, | |
1482 | int copy_bytes) | |
1483 | { | |
b22cd72c | 1484 | spin_lock(&log->l_icloglock); |
1da177e4 | 1485 | |
413d57c9 | 1486 | be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); |
1da177e4 LT |
1487 | iclog->ic_offset += copy_bytes; |
1488 | ||
b22cd72c | 1489 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
1490 | } /* xlog_state_finish_copy */ |
1491 | ||
1492 | ||
1493 | ||
1494 | ||
7e9c6396 TS |
1495 | /* |
1496 | * print out info relating to regions written which consume | |
1497 | * the reservation | |
1498 | */ | |
7e9c6396 TS |
1499 | STATIC void |
1500 | xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket) | |
1501 | { | |
1502 | uint i; | |
1503 | uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); | |
1504 | ||
1505 | /* match with XLOG_REG_TYPE_* in xfs_log.h */ | |
1506 | static char *res_type_str[XLOG_REG_TYPE_MAX] = { | |
1507 | "bformat", | |
1508 | "bchunk", | |
1509 | "efi_format", | |
1510 | "efd_format", | |
1511 | "iformat", | |
1512 | "icore", | |
1513 | "iext", | |
1514 | "ibroot", | |
1515 | "ilocal", | |
1516 | "iattr_ext", | |
1517 | "iattr_broot", | |
1518 | "iattr_local", | |
1519 | "qformat", | |
1520 | "dquot", | |
1521 | "quotaoff", | |
1522 | "LR header", | |
1523 | "unmount", | |
1524 | "commit", | |
1525 | "trans header" | |
1526 | }; | |
1527 | static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { | |
1528 | "SETATTR_NOT_SIZE", | |
1529 | "SETATTR_SIZE", | |
1530 | "INACTIVE", | |
1531 | "CREATE", | |
1532 | "CREATE_TRUNC", | |
1533 | "TRUNCATE_FILE", | |
1534 | "REMOVE", | |
1535 | "LINK", | |
1536 | "RENAME", | |
1537 | "MKDIR", | |
1538 | "RMDIR", | |
1539 | "SYMLINK", | |
1540 | "SET_DMATTRS", | |
1541 | "GROWFS", | |
1542 | "STRAT_WRITE", | |
1543 | "DIOSTRAT", | |
1544 | "WRITE_SYNC", | |
1545 | "WRITEID", | |
1546 | "ADDAFORK", | |
1547 | "ATTRINVAL", | |
1548 | "ATRUNCATE", | |
1549 | "ATTR_SET", | |
1550 | "ATTR_RM", | |
1551 | "ATTR_FLAG", | |
1552 | "CLEAR_AGI_BUCKET", | |
1553 | "QM_SBCHANGE", | |
1554 | "DUMMY1", | |
1555 | "DUMMY2", | |
1556 | "QM_QUOTAOFF", | |
1557 | "QM_DQALLOC", | |
1558 | "QM_SETQLIM", | |
1559 | "QM_DQCLUSTER", | |
1560 | "QM_QINOCREATE", | |
1561 | "QM_QUOTAOFF_END", | |
1562 | "SB_UNIT", | |
1563 | "FSYNC_TS", | |
1564 | "GROWFSRT_ALLOC", | |
1565 | "GROWFSRT_ZERO", | |
1566 | "GROWFSRT_FREE", | |
1567 | "SWAPEXT" | |
1568 | }; | |
1569 | ||
1570 | xfs_fs_cmn_err(CE_WARN, mp, | |
1571 | "xfs_log_write: reservation summary:\n" | |
1572 | " trans type = %s (%u)\n" | |
1573 | " unit res = %d bytes\n" | |
1574 | " current res = %d bytes\n" | |
1575 | " total reg = %u bytes (o/flow = %u bytes)\n" | |
1576 | " ophdrs = %u (ophdr space = %u bytes)\n" | |
1577 | " ophdr + reg = %u bytes\n" | |
1578 | " num regions = %u\n", | |
1579 | ((ticket->t_trans_type <= 0 || | |
1580 | ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? | |
1581 | "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), | |
1582 | ticket->t_trans_type, | |
1583 | ticket->t_unit_res, | |
1584 | ticket->t_curr_res, | |
1585 | ticket->t_res_arr_sum, ticket->t_res_o_flow, | |
1586 | ticket->t_res_num_ophdrs, ophdr_spc, | |
1587 | ticket->t_res_arr_sum + | |
1259845d | 1588 | ticket->t_res_o_flow + ophdr_spc, |
7e9c6396 TS |
1589 | ticket->t_res_num); |
1590 | ||
1591 | for (i = 0; i < ticket->t_res_num; i++) { | |
1259845d | 1592 | uint r_type = ticket->t_res_arr[i].r_type; |
7e9c6396 TS |
1593 | cmn_err(CE_WARN, |
1594 | "region[%u]: %s - %u bytes\n", | |
1595 | i, | |
1596 | ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? | |
1597 | "bad-rtype" : res_type_str[r_type-1]), | |
1598 | ticket->t_res_arr[i].r_len); | |
1599 | } | |
1600 | } | |
7e9c6396 | 1601 | |
1da177e4 LT |
1602 | /* |
1603 | * Write some region out to in-core log | |
1604 | * | |
1605 | * This will be called when writing externally provided regions or when | |
1606 | * writing out a commit record for a given transaction. | |
1607 | * | |
1608 | * General algorithm: | |
1609 | * 1. Find total length of this write. This may include adding to the | |
1610 | * lengths passed in. | |
1611 | * 2. Check whether we violate the tickets reservation. | |
1612 | * 3. While writing to this iclog | |
1613 | * A. Reserve as much space in this iclog as can get | |
1614 | * B. If this is first write, save away start lsn | |
1615 | * C. While writing this region: | |
1616 | * 1. If first write of transaction, write start record | |
1617 | * 2. Write log operation header (header per region) | |
1618 | * 3. Find out if we can fit entire region into this iclog | |
1619 | * 4. Potentially, verify destination memcpy ptr | |
1620 | * 5. Memcpy (partial) region | |
1621 | * 6. If partial copy, release iclog; otherwise, continue | |
1622 | * copying more regions into current iclog | |
1623 | * 4. Mark want sync bit (in simulation mode) | |
1624 | * 5. Release iclog for potential flush to on-disk log. | |
1625 | * | |
1626 | * ERRORS: | |
1627 | * 1. Panic if reservation is overrun. This should never happen since | |
1628 | * reservation amounts are generated internal to the filesystem. | |
1629 | * NOTES: | |
1630 | * 1. Tickets are single threaded data structures. | |
1631 | * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the | |
1632 | * syncing routine. When a single log_write region needs to span | |
1633 | * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set | |
1634 | * on all log operation writes which don't contain the end of the | |
1635 | * region. The XLOG_END_TRANS bit is used for the in-core log | |
1636 | * operation which contains the end of the continued log_write region. | |
1637 | * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, | |
1638 | * we don't really know exactly how much space will be used. As a result, | |
1639 | * we don't update ic_offset until the end when we know exactly how many | |
1640 | * bytes have been written out. | |
1641 | */ | |
a8272ce0 | 1642 | STATIC int |
35a8a72f CH |
1643 | xlog_write( |
1644 | struct xfs_mount *mp, | |
1645 | struct xfs_log_iovec reg[], | |
1646 | int nentries, | |
1647 | struct xlog_ticket *ticket, | |
1648 | xfs_lsn_t *start_lsn, | |
1649 | struct xlog_in_core **commit_iclog, | |
1650 | uint flags) | |
1da177e4 | 1651 | { |
5493a0fc | 1652 | xlog_t *log = mp->m_log; |
5493a0fc | 1653 | xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */ |
1da177e4 | 1654 | xlog_op_header_t *logop_head; /* ptr to log operation header */ |
1da177e4 LT |
1655 | __psint_t ptr; /* copy address into data region */ |
1656 | int len; /* # xlog_write() bytes 2 still copy */ | |
1657 | int index; /* region index currently copying */ | |
1658 | int log_offset; /* offset (from 0) into data region */ | |
1659 | int start_rec_copy; /* # bytes to copy for start record */ | |
1660 | int partial_copy; /* did we split a region? */ | |
1661 | int partial_copy_len;/* # bytes copied if split region */ | |
1662 | int need_copy; /* # bytes need to memcpy this region */ | |
1663 | int copy_len; /* # bytes actually memcpy'ing */ | |
1664 | int copy_off; /* # bytes from entry start */ | |
1665 | int contwr; /* continued write of in-core log? */ | |
1666 | int error; | |
1667 | int record_cnt = 0, data_cnt = 0; | |
1668 | ||
1669 | partial_copy_len = partial_copy = 0; | |
1670 | ||
1671 | /* Calculate potential maximum space. Each region gets its own | |
1672 | * xlog_op_header_t and may need to be double word aligned. | |
1673 | */ | |
1674 | len = 0; | |
7e9c6396 | 1675 | if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */ |
1da177e4 | 1676 | len += sizeof(xlog_op_header_t); |
0adba536 | 1677 | ticket->t_res_num_ophdrs++; |
7e9c6396 | 1678 | } |
1da177e4 LT |
1679 | |
1680 | for (index = 0; index < nentries; index++) { | |
1681 | len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ | |
0adba536 | 1682 | ticket->t_res_num_ophdrs++; |
1da177e4 | 1683 | len += reg[index].i_len; |
0adba536 | 1684 | xlog_tic_add_region(ticket, reg[index].i_len, reg[index].i_type); |
1da177e4 LT |
1685 | } |
1686 | contwr = *start_lsn = 0; | |
1687 | ||
1688 | if (ticket->t_curr_res < len) { | |
7e9c6396 | 1689 | xlog_print_tic_res(mp, ticket); |
1da177e4 LT |
1690 | #ifdef DEBUG |
1691 | xlog_panic( | |
1692 | "xfs_log_write: reservation ran out. Need to up reservation"); | |
1693 | #else | |
1694 | /* Customer configurable panic */ | |
1695 | xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, | |
1696 | "xfs_log_write: reservation ran out. Need to up reservation"); | |
1697 | /* If we did not panic, shutdown the filesystem */ | |
7d04a335 | 1698 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
1da177e4 LT |
1699 | #endif |
1700 | } else | |
1701 | ticket->t_curr_res -= len; | |
1702 | ||
1703 | for (index = 0; index < nentries; ) { | |
1704 | if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, | |
1705 | &contwr, &log_offset))) | |
014c2544 | 1706 | return error; |
1da177e4 LT |
1707 | |
1708 | ASSERT(log_offset <= iclog->ic_size - 1); | |
1709 | ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset); | |
1710 | ||
1711 | /* start_lsn is the first lsn written to. That's all we need. */ | |
1712 | if (! *start_lsn) | |
b53e675d | 1713 | *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
1da177e4 LT |
1714 | |
1715 | /* This loop writes out as many regions as can fit in the amount | |
1716 | * of space which was allocated by xlog_state_get_iclog_space(). | |
1717 | */ | |
1718 | while (index < nentries) { | |
1719 | ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); | |
1720 | ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); | |
1721 | start_rec_copy = 0; | |
1722 | ||
1723 | /* If first write for transaction, insert start record. | |
1724 | * We can't be trying to commit if we are inited. We can't | |
1725 | * have any "partial_copy" if we are inited. | |
1726 | */ | |
1727 | if (ticket->t_flags & XLOG_TIC_INITED) { | |
1728 | logop_head = (xlog_op_header_t *)ptr; | |
67fcb7bf | 1729 | logop_head->oh_tid = cpu_to_be32(ticket->t_tid); |
1da177e4 LT |
1730 | logop_head->oh_clientid = ticket->t_clientid; |
1731 | logop_head->oh_len = 0; | |
1732 | logop_head->oh_flags = XLOG_START_TRANS; | |
1733 | logop_head->oh_res2 = 0; | |
1734 | ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ | |
1735 | record_cnt++; | |
1736 | ||
1737 | start_rec_copy = sizeof(xlog_op_header_t); | |
1738 | xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); | |
1739 | } | |
1740 | ||
1741 | /* Copy log operation header directly into data section */ | |
1742 | logop_head = (xlog_op_header_t *)ptr; | |
67fcb7bf | 1743 | logop_head->oh_tid = cpu_to_be32(ticket->t_tid); |
1da177e4 LT |
1744 | logop_head->oh_clientid = ticket->t_clientid; |
1745 | logop_head->oh_res2 = 0; | |
1746 | ||
1747 | /* header copied directly */ | |
1748 | xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); | |
1749 | ||
1750 | /* are we copying a commit or unmount record? */ | |
1751 | logop_head->oh_flags = flags; | |
1752 | ||
1753 | /* | |
1754 | * We've seen logs corrupted with bad transaction client | |
1755 | * ids. This makes sure that XFS doesn't generate them on. | |
1756 | * Turn this into an EIO and shut down the filesystem. | |
1757 | */ | |
1758 | switch (logop_head->oh_clientid) { | |
1759 | case XFS_TRANSACTION: | |
1760 | case XFS_VOLUME: | |
1761 | case XFS_LOG: | |
1762 | break; | |
1763 | default: | |
1764 | xfs_fs_cmn_err(CE_WARN, mp, | |
1765 | "Bad XFS transaction clientid 0x%x in ticket 0x%p", | |
35a8a72f | 1766 | logop_head->oh_clientid, ticket); |
1da177e4 LT |
1767 | return XFS_ERROR(EIO); |
1768 | } | |
1769 | ||
1770 | /* Partial write last time? => (partial_copy != 0) | |
1771 | * need_copy is the amount we'd like to copy if everything could | |
1772 | * fit in the current memcpy. | |
1773 | */ | |
1774 | need_copy = reg[index].i_len - partial_copy_len; | |
1775 | ||
1776 | copy_off = partial_copy_len; | |
1777 | if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ | |
67fcb7bf CH |
1778 | copy_len = need_copy; |
1779 | logop_head->oh_len = cpu_to_be32(copy_len); | |
1da177e4 LT |
1780 | if (partial_copy) |
1781 | logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); | |
1782 | partial_copy_len = partial_copy = 0; | |
1783 | } else { /* partial write */ | |
1784 | copy_len = iclog->ic_size - log_offset; | |
67fcb7bf | 1785 | logop_head->oh_len = cpu_to_be32(copy_len); |
1da177e4 LT |
1786 | logop_head->oh_flags |= XLOG_CONTINUE_TRANS; |
1787 | if (partial_copy) | |
1788 | logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; | |
1789 | partial_copy_len += copy_len; | |
1790 | partial_copy++; | |
1791 | len += sizeof(xlog_op_header_t); /* from splitting of region */ | |
1792 | /* account for new log op header */ | |
1793 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
0adba536 | 1794 | ticket->t_res_num_ophdrs++; |
1da177e4 LT |
1795 | } |
1796 | xlog_verify_dest_ptr(log, ptr); | |
1797 | ||
1798 | /* copy region */ | |
1799 | ASSERT(copy_len >= 0); | |
1800 | memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); | |
1801 | xlog_write_adv_cnt(ptr, len, log_offset, copy_len); | |
1802 | ||
1803 | /* make copy_len total bytes copied, including headers */ | |
1804 | copy_len += start_rec_copy + sizeof(xlog_op_header_t); | |
1805 | record_cnt++; | |
1806 | data_cnt += contwr ? copy_len : 0; | |
1807 | if (partial_copy) { /* copied partial region */ | |
1808 | /* already marked WANT_SYNC by xlog_state_get_iclog_space */ | |
1809 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
1810 | record_cnt = data_cnt = 0; | |
1811 | if ((error = xlog_state_release_iclog(log, iclog))) | |
014c2544 | 1812 | return error; |
1da177e4 LT |
1813 | break; /* don't increment index */ |
1814 | } else { /* copied entire region */ | |
1815 | index++; | |
1816 | partial_copy_len = partial_copy = 0; | |
1817 | ||
1818 | if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { | |
1819 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
1820 | record_cnt = data_cnt = 0; | |
39e2defe | 1821 | spin_lock(&log->l_icloglock); |
1da177e4 | 1822 | xlog_state_want_sync(log, iclog); |
39e2defe | 1823 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
1824 | if (commit_iclog) { |
1825 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
1826 | *commit_iclog = iclog; | |
1827 | } else if ((error = xlog_state_release_iclog(log, iclog))) | |
014c2544 | 1828 | return error; |
1da177e4 LT |
1829 | if (index == nentries) |
1830 | return 0; /* we are done */ | |
1831 | else | |
1832 | break; | |
1833 | } | |
1834 | } /* if (partial_copy) */ | |
1835 | } /* while (index < nentries) */ | |
1836 | } /* for (index = 0; index < nentries; ) */ | |
1837 | ASSERT(len == 0); | |
1838 | ||
1839 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
1840 | if (commit_iclog) { | |
1841 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
1842 | *commit_iclog = iclog; | |
1843 | return 0; | |
1844 | } | |
014c2544 | 1845 | return xlog_state_release_iclog(log, iclog); |
1da177e4 LT |
1846 | } /* xlog_write */ |
1847 | ||
1848 | ||
1849 | /***************************************************************************** | |
1850 | * | |
1851 | * State Machine functions | |
1852 | * | |
1853 | ***************************************************************************** | |
1854 | */ | |
1855 | ||
1856 | /* Clean iclogs starting from the head. This ordering must be | |
1857 | * maintained, so an iclog doesn't become ACTIVE beyond one that | |
1858 | * is SYNCING. This is also required to maintain the notion that we use | |
12017faf | 1859 | * a ordered wait queue to hold off would be writers to the log when every |
1da177e4 LT |
1860 | * iclog is trying to sync to disk. |
1861 | * | |
1862 | * State Change: DIRTY -> ACTIVE | |
1863 | */ | |
ba0f32d4 | 1864 | STATIC void |
1da177e4 LT |
1865 | xlog_state_clean_log(xlog_t *log) |
1866 | { | |
1867 | xlog_in_core_t *iclog; | |
1868 | int changed = 0; | |
1869 | ||
1870 | iclog = log->l_iclog; | |
1871 | do { | |
1872 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
1873 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
1874 | iclog->ic_offset = 0; | |
114d23aa | 1875 | ASSERT(iclog->ic_callback == NULL); |
1da177e4 LT |
1876 | /* |
1877 | * If the number of ops in this iclog indicate it just | |
1878 | * contains the dummy transaction, we can | |
1879 | * change state into IDLE (the second time around). | |
1880 | * Otherwise we should change the state into | |
1881 | * NEED a dummy. | |
1882 | * We don't need to cover the dummy. | |
1883 | */ | |
1884 | if (!changed && | |
b53e675d CH |
1885 | (be32_to_cpu(iclog->ic_header.h_num_logops) == |
1886 | XLOG_COVER_OPS)) { | |
1da177e4 LT |
1887 | changed = 1; |
1888 | } else { | |
1889 | /* | |
1890 | * We have two dirty iclogs so start over | |
1891 | * This could also be num of ops indicates | |
1892 | * this is not the dummy going out. | |
1893 | */ | |
1894 | changed = 2; | |
1895 | } | |
1896 | iclog->ic_header.h_num_logops = 0; | |
1897 | memset(iclog->ic_header.h_cycle_data, 0, | |
1898 | sizeof(iclog->ic_header.h_cycle_data)); | |
1899 | iclog->ic_header.h_lsn = 0; | |
1900 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) | |
1901 | /* do nothing */; | |
1902 | else | |
1903 | break; /* stop cleaning */ | |
1904 | iclog = iclog->ic_next; | |
1905 | } while (iclog != log->l_iclog); | |
1906 | ||
1907 | /* log is locked when we are called */ | |
1908 | /* | |
1909 | * Change state for the dummy log recording. | |
1910 | * We usually go to NEED. But we go to NEED2 if the changed indicates | |
1911 | * we are done writing the dummy record. | |
1912 | * If we are done with the second dummy recored (DONE2), then | |
1913 | * we go to IDLE. | |
1914 | */ | |
1915 | if (changed) { | |
1916 | switch (log->l_covered_state) { | |
1917 | case XLOG_STATE_COVER_IDLE: | |
1918 | case XLOG_STATE_COVER_NEED: | |
1919 | case XLOG_STATE_COVER_NEED2: | |
1920 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
1921 | break; | |
1922 | ||
1923 | case XLOG_STATE_COVER_DONE: | |
1924 | if (changed == 1) | |
1925 | log->l_covered_state = XLOG_STATE_COVER_NEED2; | |
1926 | else | |
1927 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
1928 | break; | |
1929 | ||
1930 | case XLOG_STATE_COVER_DONE2: | |
1931 | if (changed == 1) | |
1932 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1933 | else | |
1934 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
1935 | break; | |
1936 | ||
1937 | default: | |
1938 | ASSERT(0); | |
1939 | } | |
1940 | } | |
1941 | } /* xlog_state_clean_log */ | |
1942 | ||
1943 | STATIC xfs_lsn_t | |
1944 | xlog_get_lowest_lsn( | |
1945 | xlog_t *log) | |
1946 | { | |
1947 | xlog_in_core_t *lsn_log; | |
1948 | xfs_lsn_t lowest_lsn, lsn; | |
1949 | ||
1950 | lsn_log = log->l_iclog; | |
1951 | lowest_lsn = 0; | |
1952 | do { | |
1953 | if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { | |
b53e675d | 1954 | lsn = be64_to_cpu(lsn_log->ic_header.h_lsn); |
1da177e4 LT |
1955 | if ((lsn && !lowest_lsn) || |
1956 | (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { | |
1957 | lowest_lsn = lsn; | |
1958 | } | |
1959 | } | |
1960 | lsn_log = lsn_log->ic_next; | |
1961 | } while (lsn_log != log->l_iclog); | |
014c2544 | 1962 | return lowest_lsn; |
1da177e4 LT |
1963 | } |
1964 | ||
1965 | ||
1966 | STATIC void | |
1967 | xlog_state_do_callback( | |
1968 | xlog_t *log, | |
1969 | int aborted, | |
1970 | xlog_in_core_t *ciclog) | |
1971 | { | |
1972 | xlog_in_core_t *iclog; | |
1973 | xlog_in_core_t *first_iclog; /* used to know when we've | |
1974 | * processed all iclogs once */ | |
1975 | xfs_log_callback_t *cb, *cb_next; | |
1976 | int flushcnt = 0; | |
1977 | xfs_lsn_t lowest_lsn; | |
1978 | int ioerrors; /* counter: iclogs with errors */ | |
1979 | int loopdidcallbacks; /* flag: inner loop did callbacks*/ | |
1980 | int funcdidcallbacks; /* flag: function did callbacks */ | |
1981 | int repeats; /* for issuing console warnings if | |
1982 | * looping too many times */ | |
d748c623 | 1983 | int wake = 0; |
1da177e4 | 1984 | |
b22cd72c | 1985 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
1986 | first_iclog = iclog = log->l_iclog; |
1987 | ioerrors = 0; | |
1988 | funcdidcallbacks = 0; | |
1989 | repeats = 0; | |
1990 | ||
1991 | do { | |
1992 | /* | |
1993 | * Scan all iclogs starting with the one pointed to by the | |
1994 | * log. Reset this starting point each time the log is | |
1995 | * unlocked (during callbacks). | |
1996 | * | |
1997 | * Keep looping through iclogs until one full pass is made | |
1998 | * without running any callbacks. | |
1999 | */ | |
2000 | first_iclog = log->l_iclog; | |
2001 | iclog = log->l_iclog; | |
2002 | loopdidcallbacks = 0; | |
2003 | repeats++; | |
2004 | ||
2005 | do { | |
2006 | ||
2007 | /* skip all iclogs in the ACTIVE & DIRTY states */ | |
2008 | if (iclog->ic_state & | |
2009 | (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { | |
2010 | iclog = iclog->ic_next; | |
2011 | continue; | |
2012 | } | |
2013 | ||
2014 | /* | |
2015 | * Between marking a filesystem SHUTDOWN and stopping | |
2016 | * the log, we do flush all iclogs to disk (if there | |
2017 | * wasn't a log I/O error). So, we do want things to | |
2018 | * go smoothly in case of just a SHUTDOWN w/o a | |
2019 | * LOG_IO_ERROR. | |
2020 | */ | |
2021 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
2022 | /* | |
2023 | * Can only perform callbacks in order. Since | |
2024 | * this iclog is not in the DONE_SYNC/ | |
2025 | * DO_CALLBACK state, we skip the rest and | |
2026 | * just try to clean up. If we set our iclog | |
2027 | * to DO_CALLBACK, we will not process it when | |
2028 | * we retry since a previous iclog is in the | |
2029 | * CALLBACK and the state cannot change since | |
b22cd72c | 2030 | * we are holding the l_icloglock. |
1da177e4 LT |
2031 | */ |
2032 | if (!(iclog->ic_state & | |
2033 | (XLOG_STATE_DONE_SYNC | | |
2034 | XLOG_STATE_DO_CALLBACK))) { | |
2035 | if (ciclog && (ciclog->ic_state == | |
2036 | XLOG_STATE_DONE_SYNC)) { | |
2037 | ciclog->ic_state = XLOG_STATE_DO_CALLBACK; | |
2038 | } | |
2039 | break; | |
2040 | } | |
2041 | /* | |
2042 | * We now have an iclog that is in either the | |
2043 | * DO_CALLBACK or DONE_SYNC states. The other | |
2044 | * states (WANT_SYNC, SYNCING, or CALLBACK were | |
2045 | * caught by the above if and are going to | |
2046 | * clean (i.e. we aren't doing their callbacks) | |
2047 | * see the above if. | |
2048 | */ | |
2049 | ||
2050 | /* | |
2051 | * We will do one more check here to see if we | |
2052 | * have chased our tail around. | |
2053 | */ | |
2054 | ||
2055 | lowest_lsn = xlog_get_lowest_lsn(log); | |
b53e675d CH |
2056 | if (lowest_lsn && |
2057 | XFS_LSN_CMP(lowest_lsn, | |
2058 | be64_to_cpu(iclog->ic_header.h_lsn)) < 0) { | |
1da177e4 LT |
2059 | iclog = iclog->ic_next; |
2060 | continue; /* Leave this iclog for | |
2061 | * another thread */ | |
2062 | } | |
2063 | ||
2064 | iclog->ic_state = XLOG_STATE_CALLBACK; | |
2065 | ||
b22cd72c | 2066 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2067 | |
2068 | /* l_last_sync_lsn field protected by | |
c8b5ea28 | 2069 | * l_grant_lock. Don't worry about iclog's lsn. |
1da177e4 LT |
2070 | * No one else can be here except us. |
2071 | */ | |
c8b5ea28 | 2072 | spin_lock(&log->l_grant_lock); |
b53e675d CH |
2073 | ASSERT(XFS_LSN_CMP(log->l_last_sync_lsn, |
2074 | be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); | |
2075 | log->l_last_sync_lsn = | |
2076 | be64_to_cpu(iclog->ic_header.h_lsn); | |
c8b5ea28 | 2077 | spin_unlock(&log->l_grant_lock); |
1da177e4 | 2078 | |
1da177e4 | 2079 | } else { |
114d23aa | 2080 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2081 | ioerrors++; |
2082 | } | |
1da177e4 | 2083 | |
114d23aa DC |
2084 | /* |
2085 | * Keep processing entries in the callback list until | |
2086 | * we come around and it is empty. We need to | |
2087 | * atomically see that the list is empty and change the | |
2088 | * state to DIRTY so that we don't miss any more | |
2089 | * callbacks being added. | |
2090 | */ | |
2091 | spin_lock(&iclog->ic_callback_lock); | |
2092 | cb = iclog->ic_callback; | |
4b80916b | 2093 | while (cb) { |
1da177e4 LT |
2094 | iclog->ic_callback_tail = &(iclog->ic_callback); |
2095 | iclog->ic_callback = NULL; | |
114d23aa | 2096 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2097 | |
2098 | /* perform callbacks in the order given */ | |
4b80916b | 2099 | for (; cb; cb = cb_next) { |
1da177e4 LT |
2100 | cb_next = cb->cb_next; |
2101 | cb->cb_func(cb->cb_arg, aborted); | |
2102 | } | |
114d23aa | 2103 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
2104 | cb = iclog->ic_callback; |
2105 | } | |
2106 | ||
2107 | loopdidcallbacks++; | |
2108 | funcdidcallbacks++; | |
2109 | ||
114d23aa | 2110 | spin_lock(&log->l_icloglock); |
4b80916b | 2111 | ASSERT(iclog->ic_callback == NULL); |
114d23aa | 2112 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2113 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) |
2114 | iclog->ic_state = XLOG_STATE_DIRTY; | |
2115 | ||
2116 | /* | |
2117 | * Transition from DIRTY to ACTIVE if applicable. | |
2118 | * NOP if STATE_IOERROR. | |
2119 | */ | |
2120 | xlog_state_clean_log(log); | |
2121 | ||
2122 | /* wake up threads waiting in xfs_log_force() */ | |
12017faf | 2123 | sv_broadcast(&iclog->ic_force_wait); |
1da177e4 LT |
2124 | |
2125 | iclog = iclog->ic_next; | |
2126 | } while (first_iclog != iclog); | |
a3c6685e NS |
2127 | |
2128 | if (repeats > 5000) { | |
2129 | flushcnt += repeats; | |
2130 | repeats = 0; | |
1da177e4 | 2131 | xfs_fs_cmn_err(CE_WARN, log->l_mp, |
a3c6685e | 2132 | "%s: possible infinite loop (%d iterations)", |
34a622b2 | 2133 | __func__, flushcnt); |
1da177e4 LT |
2134 | } |
2135 | } while (!ioerrors && loopdidcallbacks); | |
2136 | ||
2137 | /* | |
2138 | * make one last gasp attempt to see if iclogs are being left in | |
2139 | * limbo.. | |
2140 | */ | |
2141 | #ifdef DEBUG | |
2142 | if (funcdidcallbacks) { | |
2143 | first_iclog = iclog = log->l_iclog; | |
2144 | do { | |
2145 | ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); | |
2146 | /* | |
2147 | * Terminate the loop if iclogs are found in states | |
2148 | * which will cause other threads to clean up iclogs. | |
2149 | * | |
2150 | * SYNCING - i/o completion will go through logs | |
2151 | * DONE_SYNC - interrupt thread should be waiting for | |
b22cd72c | 2152 | * l_icloglock |
1da177e4 LT |
2153 | * IOERROR - give up hope all ye who enter here |
2154 | */ | |
2155 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC || | |
2156 | iclog->ic_state == XLOG_STATE_SYNCING || | |
2157 | iclog->ic_state == XLOG_STATE_DONE_SYNC || | |
2158 | iclog->ic_state == XLOG_STATE_IOERROR ) | |
2159 | break; | |
2160 | iclog = iclog->ic_next; | |
2161 | } while (first_iclog != iclog); | |
2162 | } | |
2163 | #endif | |
2164 | ||
d748c623 MW |
2165 | if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) |
2166 | wake = 1; | |
b22cd72c | 2167 | spin_unlock(&log->l_icloglock); |
d748c623 MW |
2168 | |
2169 | if (wake) | |
2170 | sv_broadcast(&log->l_flush_wait); | |
2171 | } | |
1da177e4 LT |
2172 | |
2173 | ||
2174 | /* | |
2175 | * Finish transitioning this iclog to the dirty state. | |
2176 | * | |
2177 | * Make sure that we completely execute this routine only when this is | |
2178 | * the last call to the iclog. There is a good chance that iclog flushes, | |
2179 | * when we reach the end of the physical log, get turned into 2 separate | |
2180 | * calls to bwrite. Hence, one iclog flush could generate two calls to this | |
2181 | * routine. By using the reference count bwritecnt, we guarantee that only | |
2182 | * the second completion goes through. | |
2183 | * | |
2184 | * Callbacks could take time, so they are done outside the scope of the | |
12017faf | 2185 | * global state machine log lock. |
1da177e4 | 2186 | */ |
a8272ce0 | 2187 | STATIC void |
1da177e4 LT |
2188 | xlog_state_done_syncing( |
2189 | xlog_in_core_t *iclog, | |
2190 | int aborted) | |
2191 | { | |
2192 | xlog_t *log = iclog->ic_log; | |
1da177e4 | 2193 | |
b22cd72c | 2194 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2195 | |
2196 | ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || | |
2197 | iclog->ic_state == XLOG_STATE_IOERROR); | |
155cc6b7 | 2198 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
2199 | ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); |
2200 | ||
2201 | ||
2202 | /* | |
2203 | * If we got an error, either on the first buffer, or in the case of | |
2204 | * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, | |
2205 | * and none should ever be attempted to be written to disk | |
2206 | * again. | |
2207 | */ | |
2208 | if (iclog->ic_state != XLOG_STATE_IOERROR) { | |
2209 | if (--iclog->ic_bwritecnt == 1) { | |
b22cd72c | 2210 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2211 | return; |
2212 | } | |
2213 | iclog->ic_state = XLOG_STATE_DONE_SYNC; | |
2214 | } | |
2215 | ||
2216 | /* | |
2217 | * Someone could be sleeping prior to writing out the next | |
2218 | * iclog buffer, we wake them all, one will get to do the | |
2219 | * I/O, the others get to wait for the result. | |
2220 | */ | |
12017faf | 2221 | sv_broadcast(&iclog->ic_write_wait); |
b22cd72c | 2222 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2223 | xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ |
2224 | } /* xlog_state_done_syncing */ | |
2225 | ||
2226 | ||
2227 | /* | |
2228 | * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must | |
12017faf DC |
2229 | * sleep. We wait on the flush queue on the head iclog as that should be |
2230 | * the first iclog to complete flushing. Hence if all iclogs are syncing, | |
2231 | * we will wait here and all new writes will sleep until a sync completes. | |
1da177e4 LT |
2232 | * |
2233 | * The in-core logs are used in a circular fashion. They are not used | |
2234 | * out-of-order even when an iclog past the head is free. | |
2235 | * | |
2236 | * return: | |
2237 | * * log_offset where xlog_write() can start writing into the in-core | |
2238 | * log's data space. | |
2239 | * * in-core log pointer to which xlog_write() should write. | |
2240 | * * boolean indicating this is a continued write to an in-core log. | |
2241 | * If this is the last write, then the in-core log's offset field | |
2242 | * needs to be incremented, depending on the amount of data which | |
2243 | * is copied. | |
2244 | */ | |
a8272ce0 | 2245 | STATIC int |
1da177e4 LT |
2246 | xlog_state_get_iclog_space(xlog_t *log, |
2247 | int len, | |
2248 | xlog_in_core_t **iclogp, | |
2249 | xlog_ticket_t *ticket, | |
2250 | int *continued_write, | |
2251 | int *logoffsetp) | |
2252 | { | |
1da177e4 LT |
2253 | int log_offset; |
2254 | xlog_rec_header_t *head; | |
2255 | xlog_in_core_t *iclog; | |
2256 | int error; | |
2257 | ||
2258 | restart: | |
b22cd72c | 2259 | spin_lock(&log->l_icloglock); |
1da177e4 | 2260 | if (XLOG_FORCED_SHUTDOWN(log)) { |
b22cd72c | 2261 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2262 | return XFS_ERROR(EIO); |
2263 | } | |
2264 | ||
2265 | iclog = log->l_iclog; | |
d748c623 | 2266 | if (iclog->ic_state != XLOG_STATE_ACTIVE) { |
1da177e4 | 2267 | XFS_STATS_INC(xs_log_noiclogs); |
d748c623 MW |
2268 | |
2269 | /* Wait for log writes to have flushed */ | |
2270 | sv_wait(&log->l_flush_wait, 0, &log->l_icloglock, 0); | |
1da177e4 LT |
2271 | goto restart; |
2272 | } | |
d748c623 | 2273 | |
1da177e4 LT |
2274 | head = &iclog->ic_header; |
2275 | ||
155cc6b7 | 2276 | atomic_inc(&iclog->ic_refcnt); /* prevents sync */ |
1da177e4 LT |
2277 | log_offset = iclog->ic_offset; |
2278 | ||
2279 | /* On the 1st write to an iclog, figure out lsn. This works | |
2280 | * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are | |
2281 | * committing to. If the offset is set, that's how many blocks | |
2282 | * must be written. | |
2283 | */ | |
2284 | if (log_offset == 0) { | |
2285 | ticket->t_curr_res -= log->l_iclog_hsize; | |
0adba536 | 2286 | xlog_tic_add_region(ticket, |
7e9c6396 TS |
2287 | log->l_iclog_hsize, |
2288 | XLOG_REG_TYPE_LRHEADER); | |
b53e675d CH |
2289 | head->h_cycle = cpu_to_be32(log->l_curr_cycle); |
2290 | head->h_lsn = cpu_to_be64( | |
03bea6fe | 2291 | xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); |
1da177e4 LT |
2292 | ASSERT(log->l_curr_block >= 0); |
2293 | } | |
2294 | ||
2295 | /* If there is enough room to write everything, then do it. Otherwise, | |
2296 | * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC | |
2297 | * bit is on, so this will get flushed out. Don't update ic_offset | |
2298 | * until you know exactly how many bytes get copied. Therefore, wait | |
2299 | * until later to update ic_offset. | |
2300 | * | |
2301 | * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's | |
2302 | * can fit into remaining data section. | |
2303 | */ | |
2304 | if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { | |
2305 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2306 | ||
49641f1a DC |
2307 | /* |
2308 | * If I'm the only one writing to this iclog, sync it to disk. | |
2309 | * We need to do an atomic compare and decrement here to avoid | |
2310 | * racing with concurrent atomic_dec_and_lock() calls in | |
2311 | * xlog_state_release_iclog() when there is more than one | |
2312 | * reference to the iclog. | |
2313 | */ | |
2314 | if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) { | |
2315 | /* we are the only one */ | |
b22cd72c | 2316 | spin_unlock(&log->l_icloglock); |
49641f1a DC |
2317 | error = xlog_state_release_iclog(log, iclog); |
2318 | if (error) | |
014c2544 | 2319 | return error; |
1da177e4 | 2320 | } else { |
b22cd72c | 2321 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2322 | } |
2323 | goto restart; | |
2324 | } | |
2325 | ||
2326 | /* Do we have enough room to write the full amount in the remainder | |
2327 | * of this iclog? Or must we continue a write on the next iclog and | |
2328 | * mark this iclog as completely taken? In the case where we switch | |
2329 | * iclogs (to mark it taken), this particular iclog will release/sync | |
2330 | * to disk in xlog_write(). | |
2331 | */ | |
2332 | if (len <= iclog->ic_size - iclog->ic_offset) { | |
2333 | *continued_write = 0; | |
2334 | iclog->ic_offset += len; | |
2335 | } else { | |
2336 | *continued_write = 1; | |
2337 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2338 | } | |
2339 | *iclogp = iclog; | |
2340 | ||
2341 | ASSERT(iclog->ic_offset <= iclog->ic_size); | |
b22cd72c | 2342 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2343 | |
2344 | *logoffsetp = log_offset; | |
2345 | return 0; | |
2346 | } /* xlog_state_get_iclog_space */ | |
2347 | ||
2348 | /* | |
2349 | * Atomically get the log space required for a log ticket. | |
2350 | * | |
2351 | * Once a ticket gets put onto the reserveq, it will only return after | |
2352 | * the needed reservation is satisfied. | |
2353 | */ | |
2354 | STATIC int | |
2355 | xlog_grant_log_space(xlog_t *log, | |
2356 | xlog_ticket_t *tic) | |
2357 | { | |
2358 | int free_bytes; | |
2359 | int need_bytes; | |
1da177e4 LT |
2360 | #ifdef DEBUG |
2361 | xfs_lsn_t tail_lsn; | |
2362 | #endif | |
2363 | ||
2364 | ||
2365 | #ifdef DEBUG | |
2366 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
2367 | panic("grant Recovery problem"); | |
2368 | #endif | |
2369 | ||
2370 | /* Is there space or do we need to sleep? */ | |
c8b5ea28 | 2371 | spin_lock(&log->l_grant_lock); |
0b1b213f CH |
2372 | |
2373 | trace_xfs_log_grant_enter(log, tic); | |
1da177e4 LT |
2374 | |
2375 | /* something is already sleeping; insert new transaction at end */ | |
2376 | if (log->l_reserve_headq) { | |
dd954c69 | 2377 | xlog_ins_ticketq(&log->l_reserve_headq, tic); |
0b1b213f CH |
2378 | |
2379 | trace_xfs_log_grant_sleep1(log, tic); | |
2380 | ||
1da177e4 LT |
2381 | /* |
2382 | * Gotta check this before going to sleep, while we're | |
2383 | * holding the grant lock. | |
2384 | */ | |
2385 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2386 | goto error_return; | |
2387 | ||
2388 | XFS_STATS_INC(xs_sleep_logspace); | |
12017faf | 2389 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); |
1da177e4 LT |
2390 | /* |
2391 | * If we got an error, and the filesystem is shutting down, | |
2392 | * we'll catch it down below. So just continue... | |
2393 | */ | |
0b1b213f | 2394 | trace_xfs_log_grant_wake1(log, tic); |
c8b5ea28 | 2395 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2396 | } |
2397 | if (tic->t_flags & XFS_LOG_PERM_RESERV) | |
2398 | need_bytes = tic->t_unit_res*tic->t_ocnt; | |
2399 | else | |
2400 | need_bytes = tic->t_unit_res; | |
2401 | ||
2402 | redo: | |
2403 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2404 | goto error_return; | |
2405 | ||
2406 | free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, | |
2407 | log->l_grant_reserve_bytes); | |
2408 | if (free_bytes < need_bytes) { | |
2409 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
dd954c69 | 2410 | xlog_ins_ticketq(&log->l_reserve_headq, tic); |
0b1b213f CH |
2411 | |
2412 | trace_xfs_log_grant_sleep2(log, tic); | |
2413 | ||
9d7fef74 DC |
2414 | spin_unlock(&log->l_grant_lock); |
2415 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
2416 | spin_lock(&log->l_grant_lock); | |
2417 | ||
1da177e4 | 2418 | XFS_STATS_INC(xs_sleep_logspace); |
12017faf | 2419 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); |
1da177e4 | 2420 | |
9d7fef74 DC |
2421 | spin_lock(&log->l_grant_lock); |
2422 | if (XLOG_FORCED_SHUTDOWN(log)) | |
1da177e4 | 2423 | goto error_return; |
1da177e4 | 2424 | |
0b1b213f CH |
2425 | trace_xfs_log_grant_wake2(log, tic); |
2426 | ||
1da177e4 LT |
2427 | goto redo; |
2428 | } else if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2429 | xlog_del_ticketq(&log->l_reserve_headq, tic); |
1da177e4 LT |
2430 | |
2431 | /* we've got enough space */ | |
dd954c69 | 2432 | xlog_grant_add_space(log, need_bytes); |
1da177e4 LT |
2433 | #ifdef DEBUG |
2434 | tail_lsn = log->l_tail_lsn; | |
2435 | /* | |
2436 | * Check to make sure the grant write head didn't just over lap the | |
2437 | * tail. If the cycles are the same, we can't be overlapping. | |
2438 | * Otherwise, make sure that the cycles differ by exactly one and | |
2439 | * check the byte count. | |
2440 | */ | |
2441 | if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { | |
2442 | ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); | |
2443 | ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); | |
2444 | } | |
2445 | #endif | |
0b1b213f | 2446 | trace_xfs_log_grant_exit(log, tic); |
1da177e4 | 2447 | xlog_verify_grant_head(log, 1); |
c8b5ea28 | 2448 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2449 | return 0; |
2450 | ||
2451 | error_return: | |
2452 | if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2453 | xlog_del_ticketq(&log->l_reserve_headq, tic); |
0b1b213f CH |
2454 | |
2455 | trace_xfs_log_grant_error(log, tic); | |
2456 | ||
1da177e4 LT |
2457 | /* |
2458 | * If we are failing, make sure the ticket doesn't have any | |
2459 | * current reservations. We don't want to add this back when | |
2460 | * the ticket/transaction gets cancelled. | |
2461 | */ | |
2462 | tic->t_curr_res = 0; | |
2463 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
c8b5ea28 | 2464 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2465 | return XFS_ERROR(EIO); |
2466 | } /* xlog_grant_log_space */ | |
2467 | ||
2468 | ||
2469 | /* | |
2470 | * Replenish the byte reservation required by moving the grant write head. | |
2471 | * | |
2472 | * | |
2473 | */ | |
2474 | STATIC int | |
2475 | xlog_regrant_write_log_space(xlog_t *log, | |
2476 | xlog_ticket_t *tic) | |
2477 | { | |
1da177e4 LT |
2478 | int free_bytes, need_bytes; |
2479 | xlog_ticket_t *ntic; | |
2480 | #ifdef DEBUG | |
2481 | xfs_lsn_t tail_lsn; | |
2482 | #endif | |
2483 | ||
2484 | tic->t_curr_res = tic->t_unit_res; | |
0adba536 | 2485 | xlog_tic_reset_res(tic); |
1da177e4 LT |
2486 | |
2487 | if (tic->t_cnt > 0) | |
014c2544 | 2488 | return 0; |
1da177e4 LT |
2489 | |
2490 | #ifdef DEBUG | |
2491 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
2492 | panic("regrant Recovery problem"); | |
2493 | #endif | |
2494 | ||
c8b5ea28 | 2495 | spin_lock(&log->l_grant_lock); |
0b1b213f CH |
2496 | |
2497 | trace_xfs_log_regrant_write_enter(log, tic); | |
1da177e4 LT |
2498 | |
2499 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2500 | goto error_return; | |
2501 | ||
2502 | /* If there are other waiters on the queue then give them a | |
2503 | * chance at logspace before us. Wake up the first waiters, | |
2504 | * if we do not wake up all the waiters then go to sleep waiting | |
2505 | * for more free space, otherwise try to get some space for | |
2506 | * this transaction. | |
2507 | */ | |
9d7fef74 | 2508 | need_bytes = tic->t_unit_res; |
1da177e4 LT |
2509 | if ((ntic = log->l_write_headq)) { |
2510 | free_bytes = xlog_space_left(log, log->l_grant_write_cycle, | |
2511 | log->l_grant_write_bytes); | |
2512 | do { | |
2513 | ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); | |
2514 | ||
2515 | if (free_bytes < ntic->t_unit_res) | |
2516 | break; | |
2517 | free_bytes -= ntic->t_unit_res; | |
12017faf | 2518 | sv_signal(&ntic->t_wait); |
1da177e4 LT |
2519 | ntic = ntic->t_next; |
2520 | } while (ntic != log->l_write_headq); | |
2521 | ||
2522 | if (ntic != log->l_write_headq) { | |
2523 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
dd954c69 | 2524 | xlog_ins_ticketq(&log->l_write_headq, tic); |
1da177e4 | 2525 | |
0b1b213f CH |
2526 | trace_xfs_log_regrant_write_sleep1(log, tic); |
2527 | ||
9d7fef74 DC |
2528 | spin_unlock(&log->l_grant_lock); |
2529 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
2530 | spin_lock(&log->l_grant_lock); | |
2531 | ||
1da177e4 | 2532 | XFS_STATS_INC(xs_sleep_logspace); |
12017faf | 2533 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, |
1da177e4 LT |
2534 | &log->l_grant_lock, s); |
2535 | ||
2536 | /* If we're shutting down, this tic is already | |
2537 | * off the queue */ | |
9d7fef74 DC |
2538 | spin_lock(&log->l_grant_lock); |
2539 | if (XLOG_FORCED_SHUTDOWN(log)) | |
1da177e4 | 2540 | goto error_return; |
1da177e4 | 2541 | |
0b1b213f | 2542 | trace_xfs_log_regrant_write_wake1(log, tic); |
1da177e4 LT |
2543 | } |
2544 | } | |
2545 | ||
1da177e4 LT |
2546 | redo: |
2547 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2548 | goto error_return; | |
2549 | ||
2550 | free_bytes = xlog_space_left(log, log->l_grant_write_cycle, | |
2551 | log->l_grant_write_bytes); | |
2552 | if (free_bytes < need_bytes) { | |
2553 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
dd954c69 | 2554 | xlog_ins_ticketq(&log->l_write_headq, tic); |
9d7fef74 DC |
2555 | spin_unlock(&log->l_grant_lock); |
2556 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
2557 | spin_lock(&log->l_grant_lock); | |
2558 | ||
1da177e4 | 2559 | XFS_STATS_INC(xs_sleep_logspace); |
0b1b213f CH |
2560 | trace_xfs_log_regrant_write_sleep2(log, tic); |
2561 | ||
12017faf | 2562 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); |
1da177e4 LT |
2563 | |
2564 | /* If we're shutting down, this tic is already off the queue */ | |
9d7fef74 DC |
2565 | spin_lock(&log->l_grant_lock); |
2566 | if (XLOG_FORCED_SHUTDOWN(log)) | |
1da177e4 | 2567 | goto error_return; |
1da177e4 | 2568 | |
0b1b213f | 2569 | trace_xfs_log_regrant_write_wake2(log, tic); |
1da177e4 LT |
2570 | goto redo; |
2571 | } else if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2572 | xlog_del_ticketq(&log->l_write_headq, tic); |
1da177e4 | 2573 | |
dd954c69 CH |
2574 | /* we've got enough space */ |
2575 | xlog_grant_add_space_write(log, need_bytes); | |
1da177e4 LT |
2576 | #ifdef DEBUG |
2577 | tail_lsn = log->l_tail_lsn; | |
2578 | if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { | |
2579 | ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); | |
2580 | ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); | |
2581 | } | |
2582 | #endif | |
2583 | ||
0b1b213f CH |
2584 | trace_xfs_log_regrant_write_exit(log, tic); |
2585 | ||
1da177e4 | 2586 | xlog_verify_grant_head(log, 1); |
c8b5ea28 | 2587 | spin_unlock(&log->l_grant_lock); |
014c2544 | 2588 | return 0; |
1da177e4 LT |
2589 | |
2590 | ||
2591 | error_return: | |
2592 | if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2593 | xlog_del_ticketq(&log->l_reserve_headq, tic); |
0b1b213f CH |
2594 | |
2595 | trace_xfs_log_regrant_write_error(log, tic); | |
2596 | ||
1da177e4 LT |
2597 | /* |
2598 | * If we are failing, make sure the ticket doesn't have any | |
2599 | * current reservations. We don't want to add this back when | |
2600 | * the ticket/transaction gets cancelled. | |
2601 | */ | |
2602 | tic->t_curr_res = 0; | |
2603 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
c8b5ea28 | 2604 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2605 | return XFS_ERROR(EIO); |
2606 | } /* xlog_regrant_write_log_space */ | |
2607 | ||
2608 | ||
2609 | /* The first cnt-1 times through here we don't need to | |
2610 | * move the grant write head because the permanent | |
2611 | * reservation has reserved cnt times the unit amount. | |
2612 | * Release part of current permanent unit reservation and | |
2613 | * reset current reservation to be one units worth. Also | |
2614 | * move grant reservation head forward. | |
2615 | */ | |
2616 | STATIC void | |
2617 | xlog_regrant_reserve_log_space(xlog_t *log, | |
2618 | xlog_ticket_t *ticket) | |
2619 | { | |
0b1b213f CH |
2620 | trace_xfs_log_regrant_reserve_enter(log, ticket); |
2621 | ||
1da177e4 LT |
2622 | if (ticket->t_cnt > 0) |
2623 | ticket->t_cnt--; | |
2624 | ||
c8b5ea28 | 2625 | spin_lock(&log->l_grant_lock); |
dd954c69 | 2626 | xlog_grant_sub_space(log, ticket->t_curr_res); |
1da177e4 | 2627 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2628 | xlog_tic_reset_res(ticket); |
0b1b213f CH |
2629 | |
2630 | trace_xfs_log_regrant_reserve_sub(log, ticket); | |
2631 | ||
1da177e4 LT |
2632 | xlog_verify_grant_head(log, 1); |
2633 | ||
2634 | /* just return if we still have some of the pre-reserved space */ | |
2635 | if (ticket->t_cnt > 0) { | |
c8b5ea28 | 2636 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2637 | return; |
2638 | } | |
2639 | ||
dd954c69 | 2640 | xlog_grant_add_space_reserve(log, ticket->t_unit_res); |
0b1b213f CH |
2641 | |
2642 | trace_xfs_log_regrant_reserve_exit(log, ticket); | |
2643 | ||
1da177e4 | 2644 | xlog_verify_grant_head(log, 0); |
c8b5ea28 | 2645 | spin_unlock(&log->l_grant_lock); |
1da177e4 | 2646 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2647 | xlog_tic_reset_res(ticket); |
1da177e4 LT |
2648 | } /* xlog_regrant_reserve_log_space */ |
2649 | ||
2650 | ||
2651 | /* | |
2652 | * Give back the space left from a reservation. | |
2653 | * | |
2654 | * All the information we need to make a correct determination of space left | |
2655 | * is present. For non-permanent reservations, things are quite easy. The | |
2656 | * count should have been decremented to zero. We only need to deal with the | |
2657 | * space remaining in the current reservation part of the ticket. If the | |
2658 | * ticket contains a permanent reservation, there may be left over space which | |
2659 | * needs to be released. A count of N means that N-1 refills of the current | |
2660 | * reservation can be done before we need to ask for more space. The first | |
2661 | * one goes to fill up the first current reservation. Once we run out of | |
2662 | * space, the count will stay at zero and the only space remaining will be | |
2663 | * in the current reservation field. | |
2664 | */ | |
2665 | STATIC void | |
2666 | xlog_ungrant_log_space(xlog_t *log, | |
2667 | xlog_ticket_t *ticket) | |
2668 | { | |
1da177e4 LT |
2669 | if (ticket->t_cnt > 0) |
2670 | ticket->t_cnt--; | |
2671 | ||
c8b5ea28 | 2672 | spin_lock(&log->l_grant_lock); |
0b1b213f | 2673 | trace_xfs_log_ungrant_enter(log, ticket); |
1da177e4 | 2674 | |
dd954c69 | 2675 | xlog_grant_sub_space(log, ticket->t_curr_res); |
1da177e4 | 2676 | |
0b1b213f | 2677 | trace_xfs_log_ungrant_sub(log, ticket); |
1da177e4 LT |
2678 | |
2679 | /* If this is a permanent reservation ticket, we may be able to free | |
2680 | * up more space based on the remaining count. | |
2681 | */ | |
2682 | if (ticket->t_cnt > 0) { | |
2683 | ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); | |
dd954c69 | 2684 | xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt); |
1da177e4 LT |
2685 | } |
2686 | ||
0b1b213f CH |
2687 | trace_xfs_log_ungrant_exit(log, ticket); |
2688 | ||
1da177e4 | 2689 | xlog_verify_grant_head(log, 1); |
c8b5ea28 | 2690 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2691 | xfs_log_move_tail(log->l_mp, 1); |
2692 | } /* xlog_ungrant_log_space */ | |
2693 | ||
2694 | ||
1da177e4 LT |
2695 | /* |
2696 | * Flush iclog to disk if this is the last reference to the given iclog and | |
2697 | * the WANT_SYNC bit is set. | |
2698 | * | |
2699 | * When this function is entered, the iclog is not necessarily in the | |
2700 | * WANT_SYNC state. It may be sitting around waiting to get filled. | |
2701 | * | |
2702 | * | |
2703 | */ | |
a8272ce0 | 2704 | STATIC int |
b589334c DC |
2705 | xlog_state_release_iclog( |
2706 | xlog_t *log, | |
2707 | xlog_in_core_t *iclog) | |
1da177e4 | 2708 | { |
1da177e4 LT |
2709 | int sync = 0; /* do we sync? */ |
2710 | ||
155cc6b7 DC |
2711 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
2712 | return XFS_ERROR(EIO); | |
2713 | ||
2714 | ASSERT(atomic_read(&iclog->ic_refcnt) > 0); | |
2715 | if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) | |
2716 | return 0; | |
2717 | ||
1da177e4 | 2718 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
b22cd72c | 2719 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2720 | return XFS_ERROR(EIO); |
2721 | } | |
1da177e4 LT |
2722 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || |
2723 | iclog->ic_state == XLOG_STATE_WANT_SYNC); | |
2724 | ||
155cc6b7 | 2725 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { |
b589334c DC |
2726 | /* update tail before writing to iclog */ |
2727 | xlog_assign_tail_lsn(log->l_mp); | |
1da177e4 LT |
2728 | sync++; |
2729 | iclog->ic_state = XLOG_STATE_SYNCING; | |
b53e675d | 2730 | iclog->ic_header.h_tail_lsn = cpu_to_be64(log->l_tail_lsn); |
1da177e4 LT |
2731 | xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); |
2732 | /* cycle incremented when incrementing curr_block */ | |
2733 | } | |
b22cd72c | 2734 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2735 | |
2736 | /* | |
2737 | * We let the log lock go, so it's possible that we hit a log I/O | |
c41564b5 | 2738 | * error or some other SHUTDOWN condition that marks the iclog |
1da177e4 LT |
2739 | * as XLOG_STATE_IOERROR before the bwrite. However, we know that |
2740 | * this iclog has consistent data, so we ignore IOERROR | |
2741 | * flags after this point. | |
2742 | */ | |
b589334c | 2743 | if (sync) |
1da177e4 | 2744 | return xlog_sync(log, iclog); |
014c2544 | 2745 | return 0; |
1da177e4 LT |
2746 | } /* xlog_state_release_iclog */ |
2747 | ||
2748 | ||
2749 | /* | |
2750 | * This routine will mark the current iclog in the ring as WANT_SYNC | |
2751 | * and move the current iclog pointer to the next iclog in the ring. | |
2752 | * When this routine is called from xlog_state_get_iclog_space(), the | |
2753 | * exact size of the iclog has not yet been determined. All we know is | |
2754 | * that every data block. We have run out of space in this log record. | |
2755 | */ | |
2756 | STATIC void | |
2757 | xlog_state_switch_iclogs(xlog_t *log, | |
2758 | xlog_in_core_t *iclog, | |
2759 | int eventual_size) | |
2760 | { | |
2761 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
2762 | if (!eventual_size) | |
2763 | eventual_size = iclog->ic_offset; | |
2764 | iclog->ic_state = XLOG_STATE_WANT_SYNC; | |
b53e675d | 2765 | iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); |
1da177e4 LT |
2766 | log->l_prev_block = log->l_curr_block; |
2767 | log->l_prev_cycle = log->l_curr_cycle; | |
2768 | ||
2769 | /* roll log?: ic_offset changed later */ | |
2770 | log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); | |
2771 | ||
2772 | /* Round up to next log-sunit */ | |
62118709 | 2773 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
1da177e4 LT |
2774 | log->l_mp->m_sb.sb_logsunit > 1) { |
2775 | __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); | |
2776 | log->l_curr_block = roundup(log->l_curr_block, sunit_bb); | |
2777 | } | |
2778 | ||
2779 | if (log->l_curr_block >= log->l_logBBsize) { | |
2780 | log->l_curr_cycle++; | |
2781 | if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) | |
2782 | log->l_curr_cycle++; | |
2783 | log->l_curr_block -= log->l_logBBsize; | |
2784 | ASSERT(log->l_curr_block >= 0); | |
2785 | } | |
2786 | ASSERT(iclog == log->l_iclog); | |
2787 | log->l_iclog = iclog->ic_next; | |
2788 | } /* xlog_state_switch_iclogs */ | |
2789 | ||
1da177e4 LT |
2790 | /* |
2791 | * Write out all data in the in-core log as of this exact moment in time. | |
2792 | * | |
2793 | * Data may be written to the in-core log during this call. However, | |
2794 | * we don't guarantee this data will be written out. A change from past | |
2795 | * implementation means this routine will *not* write out zero length LRs. | |
2796 | * | |
2797 | * Basically, we try and perform an intelligent scan of the in-core logs. | |
2798 | * If we determine there is no flushable data, we just return. There is no | |
2799 | * flushable data if: | |
2800 | * | |
2801 | * 1. the current iclog is active and has no data; the previous iclog | |
2802 | * is in the active or dirty state. | |
2803 | * 2. the current iclog is drity, and the previous iclog is in the | |
2804 | * active or dirty state. | |
2805 | * | |
12017faf | 2806 | * We may sleep if: |
1da177e4 LT |
2807 | * |
2808 | * 1. the current iclog is not in the active nor dirty state. | |
2809 | * 2. the current iclog dirty, and the previous iclog is not in the | |
2810 | * active nor dirty state. | |
2811 | * 3. the current iclog is active, and there is another thread writing | |
2812 | * to this particular iclog. | |
2813 | * 4. a) the current iclog is active and has no other writers | |
2814 | * b) when we return from flushing out this iclog, it is still | |
2815 | * not in the active nor dirty state. | |
2816 | */ | |
a14a348b CH |
2817 | int |
2818 | _xfs_log_force( | |
2819 | struct xfs_mount *mp, | |
2820 | uint flags, | |
2821 | int *log_flushed) | |
1da177e4 | 2822 | { |
a14a348b CH |
2823 | struct log *log = mp->m_log; |
2824 | struct xlog_in_core *iclog; | |
2825 | xfs_lsn_t lsn; | |
2826 | ||
2827 | XFS_STATS_INC(xs_log_force); | |
1da177e4 | 2828 | |
b22cd72c | 2829 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2830 | |
2831 | iclog = log->l_iclog; | |
2832 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 2833 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2834 | return XFS_ERROR(EIO); |
2835 | } | |
2836 | ||
2837 | /* If the head iclog is not active nor dirty, we just attach | |
2838 | * ourselves to the head and go to sleep. | |
2839 | */ | |
2840 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2841 | iclog->ic_state == XLOG_STATE_DIRTY) { | |
2842 | /* | |
2843 | * If the head is dirty or (active and empty), then | |
2844 | * we need to look at the previous iclog. If the previous | |
2845 | * iclog is active or dirty we are done. There is nothing | |
2846 | * to sync out. Otherwise, we attach ourselves to the | |
2847 | * previous iclog and go to sleep. | |
2848 | */ | |
2849 | if (iclog->ic_state == XLOG_STATE_DIRTY || | |
155cc6b7 DC |
2850 | (atomic_read(&iclog->ic_refcnt) == 0 |
2851 | && iclog->ic_offset == 0)) { | |
1da177e4 LT |
2852 | iclog = iclog->ic_prev; |
2853 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2854 | iclog->ic_state == XLOG_STATE_DIRTY) | |
2855 | goto no_sleep; | |
2856 | else | |
2857 | goto maybe_sleep; | |
2858 | } else { | |
155cc6b7 | 2859 | if (atomic_read(&iclog->ic_refcnt) == 0) { |
1da177e4 LT |
2860 | /* We are the only one with access to this |
2861 | * iclog. Flush it out now. There should | |
2862 | * be a roundoff of zero to show that someone | |
2863 | * has already taken care of the roundoff from | |
2864 | * the previous sync. | |
2865 | */ | |
155cc6b7 | 2866 | atomic_inc(&iclog->ic_refcnt); |
b53e675d | 2867 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
1da177e4 | 2868 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 2869 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2870 | |
2871 | if (xlog_state_release_iclog(log, iclog)) | |
2872 | return XFS_ERROR(EIO); | |
a14a348b CH |
2873 | |
2874 | if (log_flushed) | |
2875 | *log_flushed = 1; | |
b22cd72c | 2876 | spin_lock(&log->l_icloglock); |
b53e675d | 2877 | if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn && |
1da177e4 LT |
2878 | iclog->ic_state != XLOG_STATE_DIRTY) |
2879 | goto maybe_sleep; | |
2880 | else | |
2881 | goto no_sleep; | |
2882 | } else { | |
2883 | /* Someone else is writing to this iclog. | |
2884 | * Use its call to flush out the data. However, | |
2885 | * the other thread may not force out this LR, | |
2886 | * so we mark it WANT_SYNC. | |
2887 | */ | |
2888 | xlog_state_switch_iclogs(log, iclog, 0); | |
2889 | goto maybe_sleep; | |
2890 | } | |
2891 | } | |
2892 | } | |
2893 | ||
2894 | /* By the time we come around again, the iclog could've been filled | |
2895 | * which would give it another lsn. If we have a new lsn, just | |
2896 | * return because the relevant data has been flushed. | |
2897 | */ | |
2898 | maybe_sleep: | |
2899 | if (flags & XFS_LOG_SYNC) { | |
2900 | /* | |
2901 | * We must check if we're shutting down here, before | |
b22cd72c | 2902 | * we wait, while we're holding the l_icloglock. |
1da177e4 LT |
2903 | * Then we check again after waking up, in case our |
2904 | * sleep was disturbed by a bad news. | |
2905 | */ | |
2906 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 2907 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2908 | return XFS_ERROR(EIO); |
2909 | } | |
2910 | XFS_STATS_INC(xs_log_force_sleep); | |
12017faf | 2911 | sv_wait(&iclog->ic_force_wait, PINOD, &log->l_icloglock, s); |
1da177e4 LT |
2912 | /* |
2913 | * No need to grab the log lock here since we're | |
2914 | * only deciding whether or not to return EIO | |
2915 | * and the memory read should be atomic. | |
2916 | */ | |
2917 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
2918 | return XFS_ERROR(EIO); | |
a14a348b CH |
2919 | if (log_flushed) |
2920 | *log_flushed = 1; | |
1da177e4 LT |
2921 | } else { |
2922 | ||
2923 | no_sleep: | |
b22cd72c | 2924 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2925 | } |
2926 | return 0; | |
a14a348b | 2927 | } |
1da177e4 | 2928 | |
a14a348b CH |
2929 | /* |
2930 | * Wrapper for _xfs_log_force(), to be used when caller doesn't care | |
2931 | * about errors or whether the log was flushed or not. This is the normal | |
2932 | * interface to use when trying to unpin items or move the log forward. | |
2933 | */ | |
2934 | void | |
2935 | xfs_log_force( | |
2936 | xfs_mount_t *mp, | |
2937 | uint flags) | |
2938 | { | |
2939 | int error; | |
2940 | ||
2941 | error = _xfs_log_force(mp, flags, NULL); | |
2942 | if (error) { | |
2943 | xfs_fs_cmn_err(CE_WARN, mp, "xfs_log_force: " | |
2944 | "error %d returned.", error); | |
2945 | } | |
2946 | } | |
1da177e4 LT |
2947 | |
2948 | /* | |
a14a348b | 2949 | * Force the in-core log to disk for a specific LSN. |
1da177e4 LT |
2950 | * |
2951 | * Find in-core log with lsn. | |
2952 | * If it is in the DIRTY state, just return. | |
2953 | * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC | |
2954 | * state and go to sleep or return. | |
2955 | * If it is in any other state, go to sleep or return. | |
2956 | * | |
a14a348b CH |
2957 | * Synchronous forces are implemented with a signal variable. All callers |
2958 | * to force a given lsn to disk will wait on a the sv attached to the | |
2959 | * specific in-core log. When given in-core log finally completes its | |
2960 | * write to disk, that thread will wake up all threads waiting on the | |
2961 | * sv. | |
1da177e4 | 2962 | */ |
a14a348b CH |
2963 | int |
2964 | _xfs_log_force_lsn( | |
2965 | struct xfs_mount *mp, | |
2966 | xfs_lsn_t lsn, | |
2967 | uint flags, | |
2968 | int *log_flushed) | |
1da177e4 | 2969 | { |
a14a348b CH |
2970 | struct log *log = mp->m_log; |
2971 | struct xlog_in_core *iclog; | |
2972 | int already_slept = 0; | |
1da177e4 | 2973 | |
a14a348b | 2974 | ASSERT(lsn != 0); |
1da177e4 | 2975 | |
a14a348b | 2976 | XFS_STATS_INC(xs_log_force); |
1da177e4 | 2977 | |
a14a348b CH |
2978 | try_again: |
2979 | spin_lock(&log->l_icloglock); | |
2980 | iclog = log->l_iclog; | |
2981 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 2982 | spin_unlock(&log->l_icloglock); |
a14a348b | 2983 | return XFS_ERROR(EIO); |
1da177e4 LT |
2984 | } |
2985 | ||
a14a348b CH |
2986 | do { |
2987 | if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { | |
2988 | iclog = iclog->ic_next; | |
2989 | continue; | |
2990 | } | |
2991 | ||
2992 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
2993 | spin_unlock(&log->l_icloglock); | |
2994 | return 0; | |
2995 | } | |
2996 | ||
2997 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
2998 | /* | |
2999 | * We sleep here if we haven't already slept (e.g. | |
3000 | * this is the first time we've looked at the correct | |
3001 | * iclog buf) and the buffer before us is going to | |
3002 | * be sync'ed. The reason for this is that if we | |
3003 | * are doing sync transactions here, by waiting for | |
3004 | * the previous I/O to complete, we can allow a few | |
3005 | * more transactions into this iclog before we close | |
3006 | * it down. | |
3007 | * | |
3008 | * Otherwise, we mark the buffer WANT_SYNC, and bump | |
3009 | * up the refcnt so we can release the log (which | |
3010 | * drops the ref count). The state switch keeps new | |
3011 | * transaction commits from using this buffer. When | |
3012 | * the current commits finish writing into the buffer, | |
3013 | * the refcount will drop to zero and the buffer will | |
3014 | * go out then. | |
3015 | */ | |
3016 | if (!already_slept && | |
3017 | (iclog->ic_prev->ic_state & | |
3018 | (XLOG_STATE_WANT_SYNC | XLOG_STATE_SYNCING))) { | |
3019 | ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); | |
3020 | ||
3021 | XFS_STATS_INC(xs_log_force_sleep); | |
3022 | ||
3023 | sv_wait(&iclog->ic_prev->ic_write_wait, | |
3024 | PSWP, &log->l_icloglock, s); | |
3025 | if (log_flushed) | |
3026 | *log_flushed = 1; | |
3027 | already_slept = 1; | |
3028 | goto try_again; | |
3029 | } | |
155cc6b7 | 3030 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 3031 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 3032 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3033 | if (xlog_state_release_iclog(log, iclog)) |
3034 | return XFS_ERROR(EIO); | |
a14a348b CH |
3035 | if (log_flushed) |
3036 | *log_flushed = 1; | |
b22cd72c | 3037 | spin_lock(&log->l_icloglock); |
1da177e4 | 3038 | } |
1da177e4 | 3039 | |
a14a348b CH |
3040 | if ((flags & XFS_LOG_SYNC) && /* sleep */ |
3041 | !(iclog->ic_state & | |
3042 | (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { | |
3043 | /* | |
3044 | * Don't wait on completion if we know that we've | |
3045 | * gotten a log write error. | |
3046 | */ | |
3047 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
3048 | spin_unlock(&log->l_icloglock); | |
3049 | return XFS_ERROR(EIO); | |
3050 | } | |
3051 | XFS_STATS_INC(xs_log_force_sleep); | |
3052 | sv_wait(&iclog->ic_force_wait, PSWP, &log->l_icloglock, s); | |
3053 | /* | |
3054 | * No need to grab the log lock here since we're | |
3055 | * only deciding whether or not to return EIO | |
3056 | * and the memory read should be atomic. | |
3057 | */ | |
3058 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3059 | return XFS_ERROR(EIO); | |
1da177e4 | 3060 | |
a14a348b CH |
3061 | if (log_flushed) |
3062 | *log_flushed = 1; | |
3063 | } else { /* just return */ | |
b22cd72c | 3064 | spin_unlock(&log->l_icloglock); |
1da177e4 | 3065 | } |
1da177e4 | 3066 | |
a14a348b CH |
3067 | return 0; |
3068 | } while (iclog != log->l_iclog); | |
1da177e4 | 3069 | |
a14a348b CH |
3070 | spin_unlock(&log->l_icloglock); |
3071 | return 0; | |
3072 | } | |
3073 | ||
3074 | /* | |
3075 | * Wrapper for _xfs_log_force_lsn(), to be used when caller doesn't care | |
3076 | * about errors or whether the log was flushed or not. This is the normal | |
3077 | * interface to use when trying to unpin items or move the log forward. | |
3078 | */ | |
3079 | void | |
3080 | xfs_log_force_lsn( | |
3081 | xfs_mount_t *mp, | |
3082 | xfs_lsn_t lsn, | |
3083 | uint flags) | |
3084 | { | |
3085 | int error; | |
1da177e4 | 3086 | |
a14a348b CH |
3087 | error = _xfs_log_force_lsn(mp, lsn, flags, NULL); |
3088 | if (error) { | |
3089 | xfs_fs_cmn_err(CE_WARN, mp, "xfs_log_force: " | |
3090 | "error %d returned.", error); | |
3091 | } | |
3092 | } | |
1da177e4 LT |
3093 | |
3094 | /* | |
3095 | * Called when we want to mark the current iclog as being ready to sync to | |
3096 | * disk. | |
3097 | */ | |
a8272ce0 | 3098 | STATIC void |
1da177e4 LT |
3099 | xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) |
3100 | { | |
a8914f3a | 3101 | assert_spin_locked(&log->l_icloglock); |
1da177e4 LT |
3102 | |
3103 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3104 | xlog_state_switch_iclogs(log, iclog, 0); | |
3105 | } else { | |
3106 | ASSERT(iclog->ic_state & | |
3107 | (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); | |
3108 | } | |
39e2defe | 3109 | } |
1da177e4 LT |
3110 | |
3111 | ||
3112 | /***************************************************************************** | |
3113 | * | |
3114 | * TICKET functions | |
3115 | * | |
3116 | ***************************************************************************** | |
3117 | */ | |
3118 | ||
3119 | /* | |
9da096fd | 3120 | * Free a used ticket when its refcount falls to zero. |
1da177e4 | 3121 | */ |
cc09c0dc DC |
3122 | void |
3123 | xfs_log_ticket_put( | |
3124 | xlog_ticket_t *ticket) | |
1da177e4 | 3125 | { |
cc09c0dc DC |
3126 | ASSERT(atomic_read(&ticket->t_ref) > 0); |
3127 | if (atomic_dec_and_test(&ticket->t_ref)) { | |
3128 | sv_destroy(&ticket->t_wait); | |
3129 | kmem_zone_free(xfs_log_ticket_zone, ticket); | |
3130 | } | |
3131 | } | |
1da177e4 | 3132 | |
cc09c0dc DC |
3133 | xlog_ticket_t * |
3134 | xfs_log_ticket_get( | |
3135 | xlog_ticket_t *ticket) | |
3136 | { | |
3137 | ASSERT(atomic_read(&ticket->t_ref) > 0); | |
3138 | atomic_inc(&ticket->t_ref); | |
3139 | return ticket; | |
3140 | } | |
1da177e4 LT |
3141 | |
3142 | /* | |
eb01c9cd | 3143 | * Allocate and initialise a new log ticket. |
1da177e4 | 3144 | */ |
a8272ce0 | 3145 | STATIC xlog_ticket_t * |
cc09c0dc | 3146 | xlog_ticket_alloc(xlog_t *log, |
1da177e4 LT |
3147 | int unit_bytes, |
3148 | int cnt, | |
3149 | char client, | |
3150 | uint xflags) | |
3151 | { | |
3152 | xlog_ticket_t *tic; | |
3153 | uint num_headers; | |
1da177e4 | 3154 | |
eb01c9cd DC |
3155 | tic = kmem_zone_zalloc(xfs_log_ticket_zone, KM_SLEEP|KM_MAYFAIL); |
3156 | if (!tic) | |
3157 | return NULL; | |
1da177e4 LT |
3158 | |
3159 | /* | |
3160 | * Permanent reservations have up to 'cnt'-1 active log operations | |
3161 | * in the log. A unit in this case is the amount of space for one | |
3162 | * of these log operations. Normal reservations have a cnt of 1 | |
3163 | * and their unit amount is the total amount of space required. | |
3164 | * | |
3165 | * The following lines of code account for non-transaction data | |
32fb9b57 TS |
3166 | * which occupy space in the on-disk log. |
3167 | * | |
3168 | * Normal form of a transaction is: | |
3169 | * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> | |
3170 | * and then there are LR hdrs, split-recs and roundoff at end of syncs. | |
3171 | * | |
3172 | * We need to account for all the leadup data and trailer data | |
3173 | * around the transaction data. | |
3174 | * And then we need to account for the worst case in terms of using | |
3175 | * more space. | |
3176 | * The worst case will happen if: | |
3177 | * - the placement of the transaction happens to be such that the | |
3178 | * roundoff is at its maximum | |
3179 | * - the transaction data is synced before the commit record is synced | |
3180 | * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> | |
3181 | * Therefore the commit record is in its own Log Record. | |
3182 | * This can happen as the commit record is called with its | |
3183 | * own region to xlog_write(). | |
3184 | * This then means that in the worst case, roundoff can happen for | |
3185 | * the commit-rec as well. | |
3186 | * The commit-rec is smaller than padding in this scenario and so it is | |
3187 | * not added separately. | |
1da177e4 LT |
3188 | */ |
3189 | ||
32fb9b57 TS |
3190 | /* for trans header */ |
3191 | unit_bytes += sizeof(xlog_op_header_t); | |
3192 | unit_bytes += sizeof(xfs_trans_header_t); | |
3193 | ||
1da177e4 | 3194 | /* for start-rec */ |
32fb9b57 TS |
3195 | unit_bytes += sizeof(xlog_op_header_t); |
3196 | ||
3197 | /* for LR headers */ | |
3198 | num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); | |
3199 | unit_bytes += log->l_iclog_hsize * num_headers; | |
1da177e4 | 3200 | |
32fb9b57 TS |
3201 | /* for commit-rec LR header - note: padding will subsume the ophdr */ |
3202 | unit_bytes += log->l_iclog_hsize; | |
3203 | ||
3204 | /* for split-recs - ophdrs added when data split over LRs */ | |
3205 | unit_bytes += sizeof(xlog_op_header_t) * num_headers; | |
3206 | ||
3207 | /* for roundoff padding for transaction data and one for commit record */ | |
62118709 | 3208 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
32fb9b57 | 3209 | log->l_mp->m_sb.sb_logsunit > 1) { |
1da177e4 | 3210 | /* log su roundoff */ |
32fb9b57 | 3211 | unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; |
1da177e4 LT |
3212 | } else { |
3213 | /* BB roundoff */ | |
32fb9b57 | 3214 | unit_bytes += 2*BBSIZE; |
1da177e4 LT |
3215 | } |
3216 | ||
cc09c0dc | 3217 | atomic_set(&tic->t_ref, 1); |
1da177e4 LT |
3218 | tic->t_unit_res = unit_bytes; |
3219 | tic->t_curr_res = unit_bytes; | |
3220 | tic->t_cnt = cnt; | |
3221 | tic->t_ocnt = cnt; | |
3222 | tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); | |
3223 | tic->t_clientid = client; | |
3224 | tic->t_flags = XLOG_TIC_INITED; | |
7e9c6396 | 3225 | tic->t_trans_type = 0; |
1da177e4 LT |
3226 | if (xflags & XFS_LOG_PERM_RESERV) |
3227 | tic->t_flags |= XLOG_TIC_PERM_RESERV; | |
12017faf | 3228 | sv_init(&(tic->t_wait), SV_DEFAULT, "logtick"); |
1da177e4 | 3229 | |
0adba536 | 3230 | xlog_tic_reset_res(tic); |
7e9c6396 | 3231 | |
1da177e4 | 3232 | return tic; |
cc09c0dc | 3233 | } |
1da177e4 LT |
3234 | |
3235 | ||
3236 | /****************************************************************************** | |
3237 | * | |
3238 | * Log debug routines | |
3239 | * | |
3240 | ****************************************************************************** | |
3241 | */ | |
cfcbbbd0 | 3242 | #if defined(DEBUG) |
1da177e4 LT |
3243 | /* |
3244 | * Make sure that the destination ptr is within the valid data region of | |
3245 | * one of the iclogs. This uses backup pointers stored in a different | |
3246 | * part of the log in case we trash the log structure. | |
3247 | */ | |
3248 | void | |
3249 | xlog_verify_dest_ptr(xlog_t *log, | |
3250 | __psint_t ptr) | |
3251 | { | |
3252 | int i; | |
3253 | int good_ptr = 0; | |
3254 | ||
3255 | for (i=0; i < log->l_iclog_bufs; i++) { | |
3256 | if (ptr >= (__psint_t)log->l_iclog_bak[i] && | |
3257 | ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) | |
3258 | good_ptr++; | |
3259 | } | |
3260 | if (! good_ptr) | |
3261 | xlog_panic("xlog_verify_dest_ptr: invalid ptr"); | |
3262 | } /* xlog_verify_dest_ptr */ | |
3263 | ||
3264 | STATIC void | |
3265 | xlog_verify_grant_head(xlog_t *log, int equals) | |
3266 | { | |
3267 | if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { | |
3268 | if (equals) | |
3269 | ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); | |
3270 | else | |
3271 | ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); | |
3272 | } else { | |
3273 | ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); | |
3274 | ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); | |
3275 | } | |
3276 | } /* xlog_verify_grant_head */ | |
3277 | ||
3278 | /* check if it will fit */ | |
3279 | STATIC void | |
3280 | xlog_verify_tail_lsn(xlog_t *log, | |
3281 | xlog_in_core_t *iclog, | |
3282 | xfs_lsn_t tail_lsn) | |
3283 | { | |
3284 | int blocks; | |
3285 | ||
3286 | if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { | |
3287 | blocks = | |
3288 | log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); | |
3289 | if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) | |
3290 | xlog_panic("xlog_verify_tail_lsn: ran out of log space"); | |
3291 | } else { | |
3292 | ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); | |
3293 | ||
3294 | if (BLOCK_LSN(tail_lsn) == log->l_prev_block) | |
3295 | xlog_panic("xlog_verify_tail_lsn: tail wrapped"); | |
3296 | ||
3297 | blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; | |
3298 | if (blocks < BTOBB(iclog->ic_offset) + 1) | |
3299 | xlog_panic("xlog_verify_tail_lsn: ran out of log space"); | |
3300 | } | |
3301 | } /* xlog_verify_tail_lsn */ | |
3302 | ||
3303 | /* | |
3304 | * Perform a number of checks on the iclog before writing to disk. | |
3305 | * | |
3306 | * 1. Make sure the iclogs are still circular | |
3307 | * 2. Make sure we have a good magic number | |
3308 | * 3. Make sure we don't have magic numbers in the data | |
3309 | * 4. Check fields of each log operation header for: | |
3310 | * A. Valid client identifier | |
3311 | * B. tid ptr value falls in valid ptr space (user space code) | |
3312 | * C. Length in log record header is correct according to the | |
3313 | * individual operation headers within record. | |
3314 | * 5. When a bwrite will occur within 5 blocks of the front of the physical | |
3315 | * log, check the preceding blocks of the physical log to make sure all | |
3316 | * the cycle numbers agree with the current cycle number. | |
3317 | */ | |
3318 | STATIC void | |
3319 | xlog_verify_iclog(xlog_t *log, | |
3320 | xlog_in_core_t *iclog, | |
3321 | int count, | |
3322 | boolean_t syncing) | |
3323 | { | |
3324 | xlog_op_header_t *ophead; | |
3325 | xlog_in_core_t *icptr; | |
3326 | xlog_in_core_2_t *xhdr; | |
3327 | xfs_caddr_t ptr; | |
3328 | xfs_caddr_t base_ptr; | |
3329 | __psint_t field_offset; | |
3330 | __uint8_t clientid; | |
3331 | int len, i, j, k, op_len; | |
3332 | int idx; | |
1da177e4 LT |
3333 | |
3334 | /* check validity of iclog pointers */ | |
b22cd72c | 3335 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3336 | icptr = log->l_iclog; |
3337 | for (i=0; i < log->l_iclog_bufs; i++) { | |
4b80916b | 3338 | if (icptr == NULL) |
1da177e4 LT |
3339 | xlog_panic("xlog_verify_iclog: invalid ptr"); |
3340 | icptr = icptr->ic_next; | |
3341 | } | |
3342 | if (icptr != log->l_iclog) | |
3343 | xlog_panic("xlog_verify_iclog: corrupt iclog ring"); | |
b22cd72c | 3344 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3345 | |
3346 | /* check log magic numbers */ | |
b53e675d | 3347 | if (be32_to_cpu(iclog->ic_header.h_magicno) != XLOG_HEADER_MAGIC_NUM) |
1da177e4 LT |
3348 | xlog_panic("xlog_verify_iclog: invalid magic num"); |
3349 | ||
b53e675d CH |
3350 | ptr = (xfs_caddr_t) &iclog->ic_header; |
3351 | for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count; | |
1da177e4 | 3352 | ptr += BBSIZE) { |
b53e675d | 3353 | if (be32_to_cpu(*(__be32 *)ptr) == XLOG_HEADER_MAGIC_NUM) |
1da177e4 LT |
3354 | xlog_panic("xlog_verify_iclog: unexpected magic num"); |
3355 | } | |
3356 | ||
3357 | /* check fields */ | |
b53e675d | 3358 | len = be32_to_cpu(iclog->ic_header.h_num_logops); |
1da177e4 LT |
3359 | ptr = iclog->ic_datap; |
3360 | base_ptr = ptr; | |
3361 | ophead = (xlog_op_header_t *)ptr; | |
b28708d6 | 3362 | xhdr = iclog->ic_data; |
1da177e4 LT |
3363 | for (i = 0; i < len; i++) { |
3364 | ophead = (xlog_op_header_t *)ptr; | |
3365 | ||
3366 | /* clientid is only 1 byte */ | |
3367 | field_offset = (__psint_t) | |
3368 | ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); | |
3369 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
3370 | clientid = ophead->oh_clientid; | |
3371 | } else { | |
3372 | idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); | |
3373 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3374 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3375 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
03bea6fe CH |
3376 | clientid = xlog_get_client_id( |
3377 | xhdr[j].hic_xheader.xh_cycle_data[k]); | |
1da177e4 | 3378 | } else { |
03bea6fe CH |
3379 | clientid = xlog_get_client_id( |
3380 | iclog->ic_header.h_cycle_data[idx]); | |
1da177e4 LT |
3381 | } |
3382 | } | |
3383 | if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) | |
da1650a5 CH |
3384 | cmn_err(CE_WARN, "xlog_verify_iclog: " |
3385 | "invalid clientid %d op 0x%p offset 0x%lx", | |
3386 | clientid, ophead, (unsigned long)field_offset); | |
1da177e4 LT |
3387 | |
3388 | /* check length */ | |
3389 | field_offset = (__psint_t) | |
3390 | ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); | |
3391 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
67fcb7bf | 3392 | op_len = be32_to_cpu(ophead->oh_len); |
1da177e4 LT |
3393 | } else { |
3394 | idx = BTOBBT((__psint_t)&ophead->oh_len - | |
3395 | (__psint_t)iclog->ic_datap); | |
3396 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3397 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3398 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
b53e675d | 3399 | op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); |
1da177e4 | 3400 | } else { |
b53e675d | 3401 | op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); |
1da177e4 LT |
3402 | } |
3403 | } | |
3404 | ptr += sizeof(xlog_op_header_t) + op_len; | |
3405 | } | |
3406 | } /* xlog_verify_iclog */ | |
cfcbbbd0 | 3407 | #endif |
1da177e4 LT |
3408 | |
3409 | /* | |
b22cd72c | 3410 | * Mark all iclogs IOERROR. l_icloglock is held by the caller. |
1da177e4 LT |
3411 | */ |
3412 | STATIC int | |
3413 | xlog_state_ioerror( | |
3414 | xlog_t *log) | |
3415 | { | |
3416 | xlog_in_core_t *iclog, *ic; | |
3417 | ||
3418 | iclog = log->l_iclog; | |
3419 | if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3420 | /* | |
3421 | * Mark all the incore logs IOERROR. | |
3422 | * From now on, no log flushes will result. | |
3423 | */ | |
3424 | ic = iclog; | |
3425 | do { | |
3426 | ic->ic_state = XLOG_STATE_IOERROR; | |
3427 | ic = ic->ic_next; | |
3428 | } while (ic != iclog); | |
014c2544 | 3429 | return 0; |
1da177e4 LT |
3430 | } |
3431 | /* | |
3432 | * Return non-zero, if state transition has already happened. | |
3433 | */ | |
014c2544 | 3434 | return 1; |
1da177e4 LT |
3435 | } |
3436 | ||
3437 | /* | |
3438 | * This is called from xfs_force_shutdown, when we're forcibly | |
3439 | * shutting down the filesystem, typically because of an IO error. | |
3440 | * Our main objectives here are to make sure that: | |
3441 | * a. the filesystem gets marked 'SHUTDOWN' for all interested | |
3442 | * parties to find out, 'atomically'. | |
3443 | * b. those who're sleeping on log reservations, pinned objects and | |
3444 | * other resources get woken up, and be told the bad news. | |
3445 | * c. nothing new gets queued up after (a) and (b) are done. | |
3446 | * d. if !logerror, flush the iclogs to disk, then seal them off | |
3447 | * for business. | |
3448 | */ | |
3449 | int | |
3450 | xfs_log_force_umount( | |
3451 | struct xfs_mount *mp, | |
3452 | int logerror) | |
3453 | { | |
3454 | xlog_ticket_t *tic; | |
3455 | xlog_t *log; | |
3456 | int retval; | |
1da177e4 LT |
3457 | |
3458 | log = mp->m_log; | |
3459 | ||
3460 | /* | |
3461 | * If this happens during log recovery, don't worry about | |
3462 | * locking; the log isn't open for business yet. | |
3463 | */ | |
3464 | if (!log || | |
3465 | log->l_flags & XLOG_ACTIVE_RECOVERY) { | |
3466 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
bac8dca9 CH |
3467 | if (mp->m_sb_bp) |
3468 | XFS_BUF_DONE(mp->m_sb_bp); | |
014c2544 | 3469 | return 0; |
1da177e4 LT |
3470 | } |
3471 | ||
3472 | /* | |
3473 | * Somebody could've already done the hard work for us. | |
3474 | * No need to get locks for this. | |
3475 | */ | |
3476 | if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { | |
3477 | ASSERT(XLOG_FORCED_SHUTDOWN(log)); | |
014c2544 | 3478 | return 1; |
1da177e4 LT |
3479 | } |
3480 | retval = 0; | |
3481 | /* | |
3482 | * We must hold both the GRANT lock and the LOG lock, | |
3483 | * before we mark the filesystem SHUTDOWN and wake | |
3484 | * everybody up to tell the bad news. | |
3485 | */ | |
b22cd72c | 3486 | spin_lock(&log->l_icloglock); |
6b1d1a73 | 3487 | spin_lock(&log->l_grant_lock); |
1da177e4 | 3488 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
bac8dca9 CH |
3489 | if (mp->m_sb_bp) |
3490 | XFS_BUF_DONE(mp->m_sb_bp); | |
3491 | ||
1da177e4 LT |
3492 | /* |
3493 | * This flag is sort of redundant because of the mount flag, but | |
3494 | * it's good to maintain the separation between the log and the rest | |
3495 | * of XFS. | |
3496 | */ | |
3497 | log->l_flags |= XLOG_IO_ERROR; | |
3498 | ||
3499 | /* | |
3500 | * If we hit a log error, we want to mark all the iclogs IOERROR | |
3501 | * while we're still holding the loglock. | |
3502 | */ | |
3503 | if (logerror) | |
3504 | retval = xlog_state_ioerror(log); | |
b22cd72c | 3505 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3506 | |
3507 | /* | |
3508 | * We don't want anybody waiting for log reservations | |
3509 | * after this. That means we have to wake up everybody | |
3510 | * queued up on reserve_headq as well as write_headq. | |
3511 | * In addition, we make sure in xlog_{re}grant_log_space | |
3512 | * that we don't enqueue anything once the SHUTDOWN flag | |
3513 | * is set, and this action is protected by the GRANTLOCK. | |
3514 | */ | |
3515 | if ((tic = log->l_reserve_headq)) { | |
3516 | do { | |
12017faf | 3517 | sv_signal(&tic->t_wait); |
1da177e4 LT |
3518 | tic = tic->t_next; |
3519 | } while (tic != log->l_reserve_headq); | |
3520 | } | |
3521 | ||
3522 | if ((tic = log->l_write_headq)) { | |
3523 | do { | |
12017faf | 3524 | sv_signal(&tic->t_wait); |
1da177e4 LT |
3525 | tic = tic->t_next; |
3526 | } while (tic != log->l_write_headq); | |
3527 | } | |
c8b5ea28 | 3528 | spin_unlock(&log->l_grant_lock); |
1da177e4 | 3529 | |
a14a348b | 3530 | if (!(log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { |
1da177e4 LT |
3531 | ASSERT(!logerror); |
3532 | /* | |
3533 | * Force the incore logs to disk before shutting the | |
3534 | * log down completely. | |
3535 | */ | |
a14a348b CH |
3536 | _xfs_log_force(mp, XFS_LOG_SYNC, NULL); |
3537 | ||
b22cd72c | 3538 | spin_lock(&log->l_icloglock); |
1da177e4 | 3539 | retval = xlog_state_ioerror(log); |
b22cd72c | 3540 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3541 | } |
3542 | /* | |
3543 | * Wake up everybody waiting on xfs_log_force. | |
3544 | * Callback all log item committed functions as if the | |
3545 | * log writes were completed. | |
3546 | */ | |
3547 | xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); | |
3548 | ||
3549 | #ifdef XFSERRORDEBUG | |
3550 | { | |
3551 | xlog_in_core_t *iclog; | |
3552 | ||
b22cd72c | 3553 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3554 | iclog = log->l_iclog; |
3555 | do { | |
3556 | ASSERT(iclog->ic_callback == 0); | |
3557 | iclog = iclog->ic_next; | |
3558 | } while (iclog != log->l_iclog); | |
b22cd72c | 3559 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3560 | } |
3561 | #endif | |
3562 | /* return non-zero if log IOERROR transition had already happened */ | |
014c2544 | 3563 | return retval; |
1da177e4 LT |
3564 | } |
3565 | ||
ba0f32d4 | 3566 | STATIC int |
1da177e4 LT |
3567 | xlog_iclogs_empty(xlog_t *log) |
3568 | { | |
3569 | xlog_in_core_t *iclog; | |
3570 | ||
3571 | iclog = log->l_iclog; | |
3572 | do { | |
3573 | /* endianness does not matter here, zero is zero in | |
3574 | * any language. | |
3575 | */ | |
3576 | if (iclog->ic_header.h_num_logops) | |
014c2544 | 3577 | return 0; |
1da177e4 LT |
3578 | iclog = iclog->ic_next; |
3579 | } while (iclog != log->l_iclog); | |
014c2544 | 3580 | return 1; |
1da177e4 | 3581 | } |