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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" | |
1da177e4 | 43 | |
eb01c9cd | 44 | kmem_zone_t *xfs_log_ticket_zone; |
1da177e4 LT |
45 | |
46 | #define xlog_write_adv_cnt(ptr, len, off, bytes) \ | |
47 | { (ptr) += (bytes); \ | |
48 | (len) -= (bytes); \ | |
49 | (off) += (bytes);} | |
50 | ||
51 | /* Local miscellaneous function prototypes */ | |
52 | STATIC int xlog_bdstrat_cb(struct xfs_buf *); | |
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 LT |
62 | STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[], |
63 | int nentries, xfs_log_ticket_t tic, | |
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); | |
f538d4da CH |
82 | STATIC int xlog_state_sync(xlog_t *log, |
83 | xfs_lsn_t lsn, | |
84 | uint flags, | |
85 | int *log_flushed); | |
86 | STATIC int xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed); | |
1da177e4 LT |
87 | STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog); |
88 | ||
89 | /* local functions to manipulate grant head */ | |
90 | STATIC int xlog_grant_log_space(xlog_t *log, | |
91 | xlog_ticket_t *xtic); | |
92 | STATIC void xlog_grant_push_ail(xfs_mount_t *mp, | |
93 | int need_bytes); | |
94 | STATIC void xlog_regrant_reserve_log_space(xlog_t *log, | |
95 | xlog_ticket_t *ticket); | |
96 | STATIC int xlog_regrant_write_log_space(xlog_t *log, | |
97 | xlog_ticket_t *ticket); | |
98 | STATIC void xlog_ungrant_log_space(xlog_t *log, | |
99 | xlog_ticket_t *ticket); | |
100 | ||
101 | ||
102 | /* local ticket functions */ | |
cc09c0dc | 103 | STATIC xlog_ticket_t *xlog_ticket_alloc(xlog_t *log, |
1da177e4 LT |
104 | int unit_bytes, |
105 | int count, | |
106 | char clientid, | |
107 | uint flags); | |
1da177e4 | 108 | |
cfcbbbd0 | 109 | #if defined(DEBUG) |
1da177e4 LT |
110 | STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr); |
111 | STATIC void xlog_verify_grant_head(xlog_t *log, int equals); | |
112 | STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog, | |
113 | int count, boolean_t syncing); | |
114 | STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog, | |
115 | xfs_lsn_t tail_lsn); | |
116 | #else | |
117 | #define xlog_verify_dest_ptr(a,b) | |
118 | #define xlog_verify_grant_head(a,b) | |
119 | #define xlog_verify_iclog(a,b,c,d) | |
120 | #define xlog_verify_tail_lsn(a,b,c) | |
121 | #endif | |
122 | ||
ba0f32d4 | 123 | STATIC int xlog_iclogs_empty(xlog_t *log); |
1da177e4 | 124 | |
1da177e4 | 125 | #if defined(XFS_LOG_TRACE) |
31bd61f2 LM |
126 | |
127 | #define XLOG_TRACE_LOGGRANT_SIZE 2048 | |
128 | #define XLOG_TRACE_ICLOG_SIZE 256 | |
129 | ||
130 | void | |
131 | xlog_trace_loggrant_alloc(xlog_t *log) | |
132 | { | |
133 | log->l_grant_trace = ktrace_alloc(XLOG_TRACE_LOGGRANT_SIZE, KM_NOFS); | |
134 | } | |
135 | ||
136 | void | |
137 | xlog_trace_loggrant_dealloc(xlog_t *log) | |
138 | { | |
139 | ktrace_free(log->l_grant_trace); | |
140 | } | |
141 | ||
1da177e4 LT |
142 | void |
143 | xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string) | |
144 | { | |
7e9c6396 TS |
145 | unsigned long cnts; |
146 | ||
7e9c6396 TS |
147 | /* ticket counts are 1 byte each */ |
148 | cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8; | |
1da177e4 LT |
149 | |
150 | ktrace_enter(log->l_grant_trace, | |
151 | (void *)tic, | |
152 | (void *)log->l_reserve_headq, | |
153 | (void *)log->l_write_headq, | |
154 | (void *)((unsigned long)log->l_grant_reserve_cycle), | |
155 | (void *)((unsigned long)log->l_grant_reserve_bytes), | |
156 | (void *)((unsigned long)log->l_grant_write_cycle), | |
157 | (void *)((unsigned long)log->l_grant_write_bytes), | |
158 | (void *)((unsigned long)log->l_curr_cycle), | |
159 | (void *)((unsigned long)log->l_curr_block), | |
160 | (void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)), | |
161 | (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)), | |
162 | (void *)string, | |
7e9c6396 TS |
163 | (void *)((unsigned long)tic->t_trans_type), |
164 | (void *)cnts, | |
165 | (void *)((unsigned long)tic->t_curr_res), | |
166 | (void *)((unsigned long)tic->t_unit_res)); | |
1da177e4 LT |
167 | } |
168 | ||
31bd61f2 LM |
169 | void |
170 | xlog_trace_iclog_alloc(xlog_in_core_t *iclog) | |
171 | { | |
172 | iclog->ic_trace = ktrace_alloc(XLOG_TRACE_ICLOG_SIZE, KM_NOFS); | |
173 | } | |
174 | ||
175 | void | |
176 | xlog_trace_iclog_dealloc(xlog_in_core_t *iclog) | |
177 | { | |
178 | ktrace_free(iclog->ic_trace); | |
179 | } | |
180 | ||
1da177e4 LT |
181 | void |
182 | xlog_trace_iclog(xlog_in_core_t *iclog, uint state) | |
183 | { | |
1da177e4 LT |
184 | ktrace_enter(iclog->ic_trace, |
185 | (void *)((unsigned long)state), | |
cfcbbbd0 NS |
186 | (void *)((unsigned long)current_pid()), |
187 | (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, | |
188 | (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, | |
189 | (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, | |
190 | (void *)NULL, (void *)NULL); | |
1da177e4 | 191 | } |
1da177e4 | 192 | #else |
31bd61f2 LM |
193 | |
194 | #define xlog_trace_loggrant_alloc(log) | |
195 | #define xlog_trace_loggrant_dealloc(log) | |
1da177e4 | 196 | #define xlog_trace_loggrant(log,tic,string) |
31bd61f2 LM |
197 | |
198 | #define xlog_trace_iclog_alloc(iclog) | |
199 | #define xlog_trace_iclog_dealloc(iclog) | |
1da177e4 | 200 | #define xlog_trace_iclog(iclog,state) |
31bd61f2 | 201 | |
1da177e4 LT |
202 | #endif /* XFS_LOG_TRACE */ |
203 | ||
dd954c69 CH |
204 | |
205 | static void | |
206 | xlog_ins_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) | |
207 | { | |
208 | if (*qp) { | |
209 | tic->t_next = (*qp); | |
210 | tic->t_prev = (*qp)->t_prev; | |
211 | (*qp)->t_prev->t_next = tic; | |
212 | (*qp)->t_prev = tic; | |
213 | } else { | |
214 | tic->t_prev = tic->t_next = tic; | |
215 | *qp = tic; | |
216 | } | |
217 | ||
218 | tic->t_flags |= XLOG_TIC_IN_Q; | |
219 | } | |
220 | ||
221 | static void | |
222 | xlog_del_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic) | |
223 | { | |
224 | if (tic == tic->t_next) { | |
225 | *qp = NULL; | |
226 | } else { | |
227 | *qp = tic->t_next; | |
228 | tic->t_next->t_prev = tic->t_prev; | |
229 | tic->t_prev->t_next = tic->t_next; | |
230 | } | |
231 | ||
232 | tic->t_next = tic->t_prev = NULL; | |
233 | tic->t_flags &= ~XLOG_TIC_IN_Q; | |
234 | } | |
235 | ||
236 | static void | |
237 | xlog_grant_sub_space(struct log *log, int bytes) | |
238 | { | |
239 | log->l_grant_write_bytes -= bytes; | |
240 | if (log->l_grant_write_bytes < 0) { | |
241 | log->l_grant_write_bytes += log->l_logsize; | |
242 | log->l_grant_write_cycle--; | |
243 | } | |
244 | ||
245 | log->l_grant_reserve_bytes -= bytes; | |
246 | if ((log)->l_grant_reserve_bytes < 0) { | |
247 | log->l_grant_reserve_bytes += log->l_logsize; | |
248 | log->l_grant_reserve_cycle--; | |
249 | } | |
250 | ||
251 | } | |
252 | ||
253 | static void | |
254 | xlog_grant_add_space_write(struct log *log, int bytes) | |
255 | { | |
d729eae8 MN |
256 | int tmp = log->l_logsize - log->l_grant_write_bytes; |
257 | if (tmp > bytes) | |
258 | log->l_grant_write_bytes += bytes; | |
259 | else { | |
dd954c69 | 260 | log->l_grant_write_cycle++; |
d729eae8 | 261 | log->l_grant_write_bytes = bytes - tmp; |
dd954c69 CH |
262 | } |
263 | } | |
264 | ||
265 | static void | |
266 | xlog_grant_add_space_reserve(struct log *log, int bytes) | |
267 | { | |
d729eae8 MN |
268 | int tmp = log->l_logsize - log->l_grant_reserve_bytes; |
269 | if (tmp > bytes) | |
270 | log->l_grant_reserve_bytes += bytes; | |
271 | else { | |
dd954c69 | 272 | log->l_grant_reserve_cycle++; |
d729eae8 | 273 | log->l_grant_reserve_bytes = bytes - tmp; |
dd954c69 CH |
274 | } |
275 | } | |
276 | ||
277 | static inline void | |
278 | xlog_grant_add_space(struct log *log, int bytes) | |
279 | { | |
280 | xlog_grant_add_space_write(log, bytes); | |
281 | xlog_grant_add_space_reserve(log, bytes); | |
282 | } | |
283 | ||
0adba536 CH |
284 | static void |
285 | xlog_tic_reset_res(xlog_ticket_t *tic) | |
286 | { | |
287 | tic->t_res_num = 0; | |
288 | tic->t_res_arr_sum = 0; | |
289 | tic->t_res_num_ophdrs = 0; | |
290 | } | |
291 | ||
292 | static void | |
293 | xlog_tic_add_region(xlog_ticket_t *tic, uint len, uint type) | |
294 | { | |
295 | if (tic->t_res_num == XLOG_TIC_LEN_MAX) { | |
296 | /* add to overflow and start again */ | |
297 | tic->t_res_o_flow += tic->t_res_arr_sum; | |
298 | tic->t_res_num = 0; | |
299 | tic->t_res_arr_sum = 0; | |
300 | } | |
301 | ||
302 | tic->t_res_arr[tic->t_res_num].r_len = len; | |
303 | tic->t_res_arr[tic->t_res_num].r_type = type; | |
304 | tic->t_res_arr_sum += len; | |
305 | tic->t_res_num++; | |
306 | } | |
dd954c69 | 307 | |
1da177e4 LT |
308 | /* |
309 | * NOTES: | |
310 | * | |
311 | * 1. currblock field gets updated at startup and after in-core logs | |
312 | * marked as with WANT_SYNC. | |
313 | */ | |
314 | ||
315 | /* | |
316 | * This routine is called when a user of a log manager ticket is done with | |
317 | * the reservation. If the ticket was ever used, then a commit record for | |
318 | * the associated transaction is written out as a log operation header with | |
319 | * no data. The flag XLOG_TIC_INITED is set when the first write occurs with | |
320 | * a given ticket. If the ticket was one with a permanent reservation, then | |
321 | * a few operations are done differently. Permanent reservation tickets by | |
322 | * default don't release the reservation. They just commit the current | |
323 | * transaction with the belief that the reservation is still needed. A flag | |
324 | * must be passed in before permanent reservations are actually released. | |
325 | * When these type of tickets are not released, they need to be set into | |
326 | * the inited state again. By doing this, a start record will be written | |
327 | * out when the next write occurs. | |
328 | */ | |
329 | xfs_lsn_t | |
330 | xfs_log_done(xfs_mount_t *mp, | |
331 | xfs_log_ticket_t xtic, | |
332 | void **iclog, | |
333 | uint flags) | |
334 | { | |
335 | xlog_t *log = mp->m_log; | |
336 | xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic; | |
337 | xfs_lsn_t lsn = 0; | |
338 | ||
1da177e4 LT |
339 | if (XLOG_FORCED_SHUTDOWN(log) || |
340 | /* | |
341 | * If nothing was ever written, don't write out commit record. | |
342 | * If we get an error, just continue and give back the log ticket. | |
343 | */ | |
344 | (((ticket->t_flags & XLOG_TIC_INITED) == 0) && | |
345 | (xlog_commit_record(mp, ticket, | |
346 | (xlog_in_core_t **)iclog, &lsn)))) { | |
347 | lsn = (xfs_lsn_t) -1; | |
348 | if (ticket->t_flags & XLOG_TIC_PERM_RESERV) { | |
349 | flags |= XFS_LOG_REL_PERM_RESERV; | |
350 | } | |
351 | } | |
352 | ||
353 | ||
354 | if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 || | |
355 | (flags & XFS_LOG_REL_PERM_RESERV)) { | |
356 | /* | |
c41564b5 | 357 | * Release ticket if not permanent reservation or a specific |
1da177e4 LT |
358 | * request has been made to release a permanent reservation. |
359 | */ | |
7e9c6396 | 360 | xlog_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)"); |
1da177e4 | 361 | xlog_ungrant_log_space(log, ticket); |
cc09c0dc | 362 | xfs_log_ticket_put(ticket); |
1da177e4 | 363 | } else { |
7e9c6396 | 364 | xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)"); |
1da177e4 | 365 | xlog_regrant_reserve_log_space(log, ticket); |
c6a7b0f8 LM |
366 | /* If this ticket was a permanent reservation and we aren't |
367 | * trying to release it, reset the inited flags; so next time | |
368 | * we write, a start record will be written out. | |
369 | */ | |
1da177e4 | 370 | ticket->t_flags |= XLOG_TIC_INITED; |
c6a7b0f8 | 371 | } |
1da177e4 LT |
372 | |
373 | return lsn; | |
374 | } /* xfs_log_done */ | |
375 | ||
376 | ||
377 | /* | |
378 | * Force the in-core log to disk. If flags == XFS_LOG_SYNC, | |
379 | * the force is done synchronously. | |
380 | * | |
381 | * Asynchronous forces are implemented by setting the WANT_SYNC | |
382 | * bit in the appropriate in-core log and then returning. | |
383 | * | |
12017faf DC |
384 | * Synchronous forces are implemented with a signal variable. All callers |
385 | * to force a given lsn to disk will wait on a the sv attached to the | |
1da177e4 LT |
386 | * specific in-core log. When given in-core log finally completes its |
387 | * write to disk, that thread will wake up all threads waiting on the | |
12017faf | 388 | * sv. |
1da177e4 LT |
389 | */ |
390 | int | |
f538d4da CH |
391 | _xfs_log_force( |
392 | xfs_mount_t *mp, | |
393 | xfs_lsn_t lsn, | |
394 | uint flags, | |
395 | int *log_flushed) | |
1da177e4 | 396 | { |
f538d4da CH |
397 | xlog_t *log = mp->m_log; |
398 | int dummy; | |
399 | ||
400 | if (!log_flushed) | |
401 | log_flushed = &dummy; | |
1da177e4 | 402 | |
1da177e4 LT |
403 | ASSERT(flags & XFS_LOG_FORCE); |
404 | ||
405 | XFS_STATS_INC(xs_log_force); | |
406 | ||
f538d4da CH |
407 | if (log->l_flags & XLOG_IO_ERROR) |
408 | return XFS_ERROR(EIO); | |
409 | if (lsn == 0) | |
410 | return xlog_state_sync_all(log, flags, log_flushed); | |
411 | else | |
412 | return xlog_state_sync(log, lsn, flags, log_flushed); | |
b911ca04 DC |
413 | } /* _xfs_log_force */ |
414 | ||
415 | /* | |
416 | * Wrapper for _xfs_log_force(), to be used when caller doesn't care | |
417 | * about errors or whether the log was flushed or not. This is the normal | |
418 | * interface to use when trying to unpin items or move the log forward. | |
419 | */ | |
420 | void | |
421 | xfs_log_force( | |
422 | xfs_mount_t *mp, | |
423 | xfs_lsn_t lsn, | |
424 | uint flags) | |
425 | { | |
426 | int error; | |
427 | error = _xfs_log_force(mp, lsn, flags, NULL); | |
428 | if (error) { | |
429 | xfs_fs_cmn_err(CE_WARN, mp, "xfs_log_force: " | |
430 | "error %d returned.", error); | |
431 | } | |
432 | } | |
433 | ||
1da177e4 LT |
434 | |
435 | /* | |
436 | * Attaches a new iclog I/O completion callback routine during | |
437 | * transaction commit. If the log is in error state, a non-zero | |
438 | * return code is handed back and the caller is responsible for | |
439 | * executing the callback at an appropriate time. | |
440 | */ | |
441 | int | |
442 | xfs_log_notify(xfs_mount_t *mp, /* mount of partition */ | |
443 | void *iclog_hndl, /* iclog to hang callback off */ | |
444 | xfs_log_callback_t *cb) | |
445 | { | |
1da177e4 | 446 | xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; |
b22cd72c | 447 | int abortflg; |
1da177e4 | 448 | |
114d23aa | 449 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
450 | abortflg = (iclog->ic_state & XLOG_STATE_IOERROR); |
451 | if (!abortflg) { | |
452 | ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) || | |
453 | (iclog->ic_state == XLOG_STATE_WANT_SYNC)); | |
454 | cb->cb_next = NULL; | |
455 | *(iclog->ic_callback_tail) = cb; | |
456 | iclog->ic_callback_tail = &(cb->cb_next); | |
457 | } | |
114d23aa | 458 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
459 | return abortflg; |
460 | } /* xfs_log_notify */ | |
461 | ||
462 | int | |
463 | xfs_log_release_iclog(xfs_mount_t *mp, | |
464 | void *iclog_hndl) | |
465 | { | |
466 | xlog_t *log = mp->m_log; | |
467 | xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl; | |
468 | ||
469 | if (xlog_state_release_iclog(log, iclog)) { | |
7d04a335 | 470 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
014c2544 | 471 | return EIO; |
1da177e4 LT |
472 | } |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | /* | |
478 | * 1. Reserve an amount of on-disk log space and return a ticket corresponding | |
479 | * to the reservation. | |
480 | * 2. Potentially, push buffers at tail of log to disk. | |
481 | * | |
482 | * Each reservation is going to reserve extra space for a log record header. | |
483 | * When writes happen to the on-disk log, we don't subtract the length of the | |
484 | * log record header from any reservation. By wasting space in each | |
485 | * reservation, we prevent over allocation problems. | |
486 | */ | |
487 | int | |
488 | xfs_log_reserve(xfs_mount_t *mp, | |
489 | int unit_bytes, | |
490 | int cnt, | |
491 | xfs_log_ticket_t *ticket, | |
492 | __uint8_t client, | |
7e9c6396 TS |
493 | uint flags, |
494 | uint t_type) | |
1da177e4 LT |
495 | { |
496 | xlog_t *log = mp->m_log; | |
497 | xlog_ticket_t *internal_ticket; | |
cfcbbbd0 | 498 | int retval = 0; |
1da177e4 | 499 | |
1da177e4 LT |
500 | ASSERT(client == XFS_TRANSACTION || client == XFS_LOG); |
501 | ASSERT((flags & XFS_LOG_NOSLEEP) == 0); | |
502 | ||
503 | if (XLOG_FORCED_SHUTDOWN(log)) | |
504 | return XFS_ERROR(EIO); | |
505 | ||
506 | XFS_STATS_INC(xs_try_logspace); | |
507 | ||
508 | if (*ticket != NULL) { | |
509 | ASSERT(flags & XFS_LOG_PERM_RESERV); | |
510 | internal_ticket = (xlog_ticket_t *)*ticket; | |
7e9c6396 | 511 | xlog_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)"); |
1da177e4 LT |
512 | xlog_grant_push_ail(mp, internal_ticket->t_unit_res); |
513 | retval = xlog_regrant_write_log_space(log, internal_ticket); | |
514 | } else { | |
515 | /* may sleep if need to allocate more tickets */ | |
cc09c0dc | 516 | internal_ticket = xlog_ticket_alloc(log, unit_bytes, cnt, |
1da177e4 | 517 | client, flags); |
eb01c9cd DC |
518 | if (!internal_ticket) |
519 | return XFS_ERROR(ENOMEM); | |
7e9c6396 | 520 | internal_ticket->t_trans_type = t_type; |
1da177e4 | 521 | *ticket = internal_ticket; |
7e9c6396 TS |
522 | xlog_trace_loggrant(log, internal_ticket, |
523 | (internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ? | |
524 | "xfs_log_reserve: create new ticket (permanent trans)" : | |
525 | "xfs_log_reserve: create new ticket"); | |
1da177e4 LT |
526 | xlog_grant_push_ail(mp, |
527 | (internal_ticket->t_unit_res * | |
528 | internal_ticket->t_cnt)); | |
529 | retval = xlog_grant_log_space(log, internal_ticket); | |
530 | } | |
531 | ||
532 | return retval; | |
533 | } /* xfs_log_reserve */ | |
534 | ||
535 | ||
536 | /* | |
537 | * Mount a log filesystem | |
538 | * | |
539 | * mp - ubiquitous xfs mount point structure | |
540 | * log_target - buftarg of on-disk log device | |
541 | * blk_offset - Start block # where block size is 512 bytes (BBSIZE) | |
542 | * num_bblocks - Number of BBSIZE blocks in on-disk log | |
543 | * | |
544 | * Return error or zero. | |
545 | */ | |
546 | int | |
249a8c11 DC |
547 | xfs_log_mount( |
548 | xfs_mount_t *mp, | |
549 | xfs_buftarg_t *log_target, | |
550 | xfs_daddr_t blk_offset, | |
551 | int num_bblks) | |
1da177e4 | 552 | { |
249a8c11 DC |
553 | int error; |
554 | ||
1da177e4 LT |
555 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) |
556 | cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname); | |
557 | else { | |
558 | cmn_err(CE_NOTE, | |
559 | "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.", | |
560 | mp->m_fsname); | |
bd186aa9 | 561 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
562 | } |
563 | ||
564 | mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks); | |
644c3567 DC |
565 | if (!mp->m_log) { |
566 | cmn_err(CE_WARN, "XFS: Log allocation failed: No memory!"); | |
567 | error = ENOMEM; | |
568 | goto out; | |
569 | } | |
1da177e4 | 570 | |
249a8c11 DC |
571 | /* |
572 | * Initialize the AIL now we have a log. | |
573 | */ | |
249a8c11 DC |
574 | error = xfs_trans_ail_init(mp); |
575 | if (error) { | |
576 | cmn_err(CE_WARN, "XFS: AIL initialisation failed: error %d", error); | |
26430752 | 577 | goto out_free_log; |
249a8c11 | 578 | } |
a9c21c1b | 579 | mp->m_log->l_ailp = mp->m_ail; |
249a8c11 | 580 | |
1da177e4 LT |
581 | /* |
582 | * skip log recovery on a norecovery mount. pretend it all | |
583 | * just worked. | |
584 | */ | |
585 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) { | |
249a8c11 | 586 | int readonly = (mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
587 | |
588 | if (readonly) | |
bd186aa9 | 589 | mp->m_flags &= ~XFS_MOUNT_RDONLY; |
1da177e4 | 590 | |
65be6054 | 591 | error = xlog_recover(mp->m_log); |
1da177e4 LT |
592 | |
593 | if (readonly) | |
bd186aa9 | 594 | mp->m_flags |= XFS_MOUNT_RDONLY; |
1da177e4 LT |
595 | if (error) { |
596 | cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error); | |
26430752 | 597 | goto out_destroy_ail; |
1da177e4 LT |
598 | } |
599 | } | |
600 | ||
601 | /* Normal transactions can now occur */ | |
602 | mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY; | |
603 | ||
1da177e4 | 604 | return 0; |
26430752 CH |
605 | |
606 | out_destroy_ail: | |
607 | xfs_trans_ail_destroy(mp); | |
608 | out_free_log: | |
609 | xlog_dealloc_log(mp->m_log); | |
644c3567 | 610 | out: |
249a8c11 | 611 | return error; |
26430752 | 612 | } |
1da177e4 LT |
613 | |
614 | /* | |
615 | * Finish the recovery of the file system. This is separate from | |
616 | * the xfs_log_mount() call, because it depends on the code in | |
617 | * xfs_mountfs() to read in the root and real-time bitmap inodes | |
618 | * between calling xfs_log_mount() and here. | |
619 | * | |
620 | * mp - ubiquitous xfs mount point structure | |
621 | */ | |
622 | int | |
4249023a | 623 | xfs_log_mount_finish(xfs_mount_t *mp) |
1da177e4 LT |
624 | { |
625 | int error; | |
626 | ||
627 | if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) | |
4249023a | 628 | error = xlog_recover_finish(mp->m_log); |
1da177e4 LT |
629 | else { |
630 | error = 0; | |
bd186aa9 | 631 | ASSERT(mp->m_flags & XFS_MOUNT_RDONLY); |
1da177e4 LT |
632 | } |
633 | ||
634 | return error; | |
635 | } | |
636 | ||
1da177e4 LT |
637 | /* |
638 | * Final log writes as part of unmount. | |
639 | * | |
640 | * Mark the filesystem clean as unmount happens. Note that during relocation | |
641 | * this routine needs to be executed as part of source-bag while the | |
642 | * deallocation must not be done until source-end. | |
643 | */ | |
644 | ||
645 | /* | |
646 | * Unmount record used to have a string "Unmount filesystem--" in the | |
647 | * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE). | |
648 | * We just write the magic number now since that particular field isn't | |
649 | * currently architecture converted and "nUmount" is a bit foo. | |
650 | * As far as I know, there weren't any dependencies on the old behaviour. | |
651 | */ | |
652 | ||
653 | int | |
654 | xfs_log_unmount_write(xfs_mount_t *mp) | |
655 | { | |
656 | xlog_t *log = mp->m_log; | |
657 | xlog_in_core_t *iclog; | |
658 | #ifdef DEBUG | |
659 | xlog_in_core_t *first_iclog; | |
660 | #endif | |
661 | xfs_log_iovec_t reg[1]; | |
662 | xfs_log_ticket_t tic = NULL; | |
663 | xfs_lsn_t lsn; | |
664 | int error; | |
1da177e4 LT |
665 | |
666 | /* the data section must be 32 bit size aligned */ | |
667 | struct { | |
668 | __uint16_t magic; | |
669 | __uint16_t pad1; | |
670 | __uint32_t pad2; /* may as well make it 64 bits */ | |
671 | } magic = { XLOG_UNMOUNT_TYPE, 0, 0 }; | |
672 | ||
1da177e4 LT |
673 | /* |
674 | * Don't write out unmount record on read-only mounts. | |
675 | * Or, if we are doing a forced umount (typically because of IO errors). | |
676 | */ | |
bd186aa9 | 677 | if (mp->m_flags & XFS_MOUNT_RDONLY) |
1da177e4 LT |
678 | return 0; |
679 | ||
b911ca04 DC |
680 | error = _xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC, NULL); |
681 | ASSERT(error || !(XLOG_FORCED_SHUTDOWN(log))); | |
1da177e4 LT |
682 | |
683 | #ifdef DEBUG | |
684 | first_iclog = iclog = log->l_iclog; | |
685 | do { | |
686 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
687 | ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE); | |
688 | ASSERT(iclog->ic_offset == 0); | |
689 | } | |
690 | iclog = iclog->ic_next; | |
691 | } while (iclog != first_iclog); | |
692 | #endif | |
693 | if (! (XLOG_FORCED_SHUTDOWN(log))) { | |
694 | reg[0].i_addr = (void*)&magic; | |
695 | reg[0].i_len = sizeof(magic); | |
7e9c6396 | 696 | XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_UNMOUNT); |
1da177e4 | 697 | |
955e47ad TS |
698 | error = xfs_log_reserve(mp, 600, 1, &tic, |
699 | XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE); | |
1da177e4 LT |
700 | if (!error) { |
701 | /* remove inited flag */ | |
702 | ((xlog_ticket_t *)tic)->t_flags = 0; | |
703 | error = xlog_write(mp, reg, 1, tic, &lsn, | |
704 | NULL, XLOG_UNMOUNT_TRANS); | |
705 | /* | |
706 | * At this point, we're umounting anyway, | |
707 | * so there's no point in transitioning log state | |
708 | * to IOERROR. Just continue... | |
709 | */ | |
710 | } | |
711 | ||
712 | if (error) { | |
713 | xfs_fs_cmn_err(CE_ALERT, mp, | |
714 | "xfs_log_unmount: unmount record failed"); | |
715 | } | |
716 | ||
717 | ||
b22cd72c | 718 | spin_lock(&log->l_icloglock); |
1da177e4 | 719 | iclog = log->l_iclog; |
155cc6b7 | 720 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 721 | xlog_state_want_sync(log, iclog); |
39e2defe | 722 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 723 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 724 | |
b22cd72c | 725 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
726 | if (!(iclog->ic_state == XLOG_STATE_ACTIVE || |
727 | iclog->ic_state == XLOG_STATE_DIRTY)) { | |
728 | if (!XLOG_FORCED_SHUTDOWN(log)) { | |
12017faf | 729 | sv_wait(&iclog->ic_force_wait, PMEM, |
1da177e4 LT |
730 | &log->l_icloglock, s); |
731 | } else { | |
b22cd72c | 732 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
733 | } |
734 | } else { | |
b22cd72c | 735 | spin_unlock(&log->l_icloglock); |
1da177e4 | 736 | } |
955e47ad TS |
737 | if (tic) { |
738 | xlog_trace_loggrant(log, tic, "unmount rec"); | |
739 | xlog_ungrant_log_space(log, tic); | |
cc09c0dc | 740 | xfs_log_ticket_put(tic); |
955e47ad | 741 | } |
1da177e4 LT |
742 | } else { |
743 | /* | |
744 | * We're already in forced_shutdown mode, couldn't | |
745 | * even attempt to write out the unmount transaction. | |
746 | * | |
747 | * Go through the motions of sync'ing and releasing | |
748 | * the iclog, even though no I/O will actually happen, | |
c41564b5 | 749 | * we need to wait for other log I/Os that may already |
1da177e4 LT |
750 | * be in progress. Do this as a separate section of |
751 | * code so we'll know if we ever get stuck here that | |
752 | * we're in this odd situation of trying to unmount | |
753 | * a file system that went into forced_shutdown as | |
754 | * the result of an unmount.. | |
755 | */ | |
b22cd72c | 756 | spin_lock(&log->l_icloglock); |
1da177e4 | 757 | iclog = log->l_iclog; |
155cc6b7 | 758 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 LT |
759 | |
760 | xlog_state_want_sync(log, iclog); | |
39e2defe | 761 | spin_unlock(&log->l_icloglock); |
1bb7d6b5 | 762 | error = xlog_state_release_iclog(log, iclog); |
1da177e4 | 763 | |
b22cd72c | 764 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
765 | |
766 | if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE | |
767 | || iclog->ic_state == XLOG_STATE_DIRTY | |
768 | || iclog->ic_state == XLOG_STATE_IOERROR) ) { | |
769 | ||
12017faf | 770 | sv_wait(&iclog->ic_force_wait, PMEM, |
1da177e4 LT |
771 | &log->l_icloglock, s); |
772 | } else { | |
b22cd72c | 773 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
774 | } |
775 | } | |
776 | ||
1bb7d6b5 | 777 | return error; |
1da177e4 LT |
778 | } /* xfs_log_unmount_write */ |
779 | ||
780 | /* | |
781 | * Deallocate log structures for unmount/relocation. | |
249a8c11 DC |
782 | * |
783 | * We need to stop the aild from running before we destroy | |
784 | * and deallocate the log as the aild references the log. | |
1da177e4 LT |
785 | */ |
786 | void | |
21b699c8 | 787 | xfs_log_unmount(xfs_mount_t *mp) |
1da177e4 | 788 | { |
249a8c11 | 789 | xfs_trans_ail_destroy(mp); |
c41564b5 | 790 | xlog_dealloc_log(mp->m_log); |
1da177e4 LT |
791 | } |
792 | ||
793 | /* | |
794 | * Write region vectors to log. The write happens using the space reservation | |
795 | * of the ticket (tic). It is not a requirement that all writes for a given | |
796 | * transaction occur with one call to xfs_log_write(). | |
797 | */ | |
798 | int | |
799 | xfs_log_write(xfs_mount_t * mp, | |
800 | xfs_log_iovec_t reg[], | |
801 | int nentries, | |
802 | xfs_log_ticket_t tic, | |
803 | xfs_lsn_t *start_lsn) | |
804 | { | |
805 | int error; | |
806 | xlog_t *log = mp->m_log; | |
807 | ||
1da177e4 LT |
808 | if (XLOG_FORCED_SHUTDOWN(log)) |
809 | return XFS_ERROR(EIO); | |
810 | ||
811 | if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) { | |
7d04a335 | 812 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 | 813 | } |
014c2544 | 814 | return error; |
1da177e4 LT |
815 | } /* xfs_log_write */ |
816 | ||
817 | ||
818 | void | |
819 | xfs_log_move_tail(xfs_mount_t *mp, | |
820 | xfs_lsn_t tail_lsn) | |
821 | { | |
822 | xlog_ticket_t *tic; | |
823 | xlog_t *log = mp->m_log; | |
824 | int need_bytes, free_bytes, cycle, bytes; | |
1da177e4 | 825 | |
1da177e4 LT |
826 | if (XLOG_FORCED_SHUTDOWN(log)) |
827 | return; | |
1da177e4 LT |
828 | |
829 | if (tail_lsn == 0) { | |
830 | /* needed since sync_lsn is 64 bits */ | |
b22cd72c | 831 | spin_lock(&log->l_icloglock); |
1da177e4 | 832 | tail_lsn = log->l_last_sync_lsn; |
b22cd72c | 833 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
834 | } |
835 | ||
c8b5ea28 | 836 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
837 | |
838 | /* Also an invalid lsn. 1 implies that we aren't passing in a valid | |
839 | * tail_lsn. | |
840 | */ | |
841 | if (tail_lsn != 1) { | |
842 | log->l_tail_lsn = tail_lsn; | |
843 | } | |
844 | ||
845 | if ((tic = log->l_write_headq)) { | |
846 | #ifdef DEBUG | |
847 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
848 | panic("Recovery problem"); | |
849 | #endif | |
850 | cycle = log->l_grant_write_cycle; | |
851 | bytes = log->l_grant_write_bytes; | |
852 | free_bytes = xlog_space_left(log, cycle, bytes); | |
853 | do { | |
854 | ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV); | |
855 | ||
856 | if (free_bytes < tic->t_unit_res && tail_lsn != 1) | |
857 | break; | |
858 | tail_lsn = 0; | |
859 | free_bytes -= tic->t_unit_res; | |
12017faf | 860 | sv_signal(&tic->t_wait); |
1da177e4 LT |
861 | tic = tic->t_next; |
862 | } while (tic != log->l_write_headq); | |
863 | } | |
864 | if ((tic = log->l_reserve_headq)) { | |
865 | #ifdef DEBUG | |
866 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
867 | panic("Recovery problem"); | |
868 | #endif | |
869 | cycle = log->l_grant_reserve_cycle; | |
870 | bytes = log->l_grant_reserve_bytes; | |
871 | free_bytes = xlog_space_left(log, cycle, bytes); | |
872 | do { | |
873 | if (tic->t_flags & XLOG_TIC_PERM_RESERV) | |
874 | need_bytes = tic->t_unit_res*tic->t_cnt; | |
875 | else | |
876 | need_bytes = tic->t_unit_res; | |
877 | if (free_bytes < need_bytes && tail_lsn != 1) | |
878 | break; | |
879 | tail_lsn = 0; | |
880 | free_bytes -= need_bytes; | |
12017faf | 881 | sv_signal(&tic->t_wait); |
1da177e4 LT |
882 | tic = tic->t_next; |
883 | } while (tic != log->l_reserve_headq); | |
884 | } | |
c8b5ea28 | 885 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
886 | } /* xfs_log_move_tail */ |
887 | ||
888 | /* | |
889 | * Determine if we have a transaction that has gone to disk | |
890 | * that needs to be covered. Log activity needs to be idle (no AIL and | |
891 | * nothing in the iclogs). And, we need to be in the right state indicating | |
892 | * something has gone out. | |
893 | */ | |
894 | int | |
895 | xfs_log_need_covered(xfs_mount_t *mp) | |
896 | { | |
27d8d5fe | 897 | int needed = 0; |
1da177e4 | 898 | xlog_t *log = mp->m_log; |
1da177e4 | 899 | |
92821e2b | 900 | if (!xfs_fs_writable(mp)) |
1da177e4 LT |
901 | return 0; |
902 | ||
b22cd72c | 903 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
904 | if (((log->l_covered_state == XLOG_STATE_COVER_NEED) || |
905 | (log->l_covered_state == XLOG_STATE_COVER_NEED2)) | |
a9c21c1b | 906 | && !xfs_trans_ail_tail(log->l_ailp) |
1da177e4 LT |
907 | && xlog_iclogs_empty(log)) { |
908 | if (log->l_covered_state == XLOG_STATE_COVER_NEED) | |
909 | log->l_covered_state = XLOG_STATE_COVER_DONE; | |
910 | else { | |
911 | ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2); | |
912 | log->l_covered_state = XLOG_STATE_COVER_DONE2; | |
913 | } | |
914 | needed = 1; | |
915 | } | |
b22cd72c | 916 | spin_unlock(&log->l_icloglock); |
014c2544 | 917 | return needed; |
1da177e4 LT |
918 | } |
919 | ||
920 | /****************************************************************************** | |
921 | * | |
922 | * local routines | |
923 | * | |
924 | ****************************************************************************** | |
925 | */ | |
926 | ||
927 | /* xfs_trans_tail_ail returns 0 when there is nothing in the list. | |
928 | * The log manager must keep track of the last LR which was committed | |
929 | * to disk. The lsn of this LR will become the new tail_lsn whenever | |
930 | * xfs_trans_tail_ail returns 0. If we don't do this, we run into | |
931 | * the situation where stuff could be written into the log but nothing | |
932 | * was ever in the AIL when asked. Eventually, we panic since the | |
933 | * tail hits the head. | |
934 | * | |
935 | * We may be holding the log iclog lock upon entering this routine. | |
936 | */ | |
937 | xfs_lsn_t | |
938 | xlog_assign_tail_lsn(xfs_mount_t *mp) | |
939 | { | |
940 | xfs_lsn_t tail_lsn; | |
1da177e4 LT |
941 | xlog_t *log = mp->m_log; |
942 | ||
5b00f14f | 943 | tail_lsn = xfs_trans_ail_tail(mp->m_ail); |
c8b5ea28 | 944 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
945 | if (tail_lsn != 0) { |
946 | log->l_tail_lsn = tail_lsn; | |
947 | } else { | |
948 | tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn; | |
949 | } | |
c8b5ea28 | 950 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
951 | |
952 | return tail_lsn; | |
953 | } /* xlog_assign_tail_lsn */ | |
954 | ||
955 | ||
956 | /* | |
957 | * Return the space in the log between the tail and the head. The head | |
958 | * is passed in the cycle/bytes formal parms. In the special case where | |
959 | * the reserve head has wrapped passed the tail, this calculation is no | |
960 | * longer valid. In this case, just return 0 which means there is no space | |
961 | * in the log. This works for all places where this function is called | |
962 | * with the reserve head. Of course, if the write head were to ever | |
963 | * wrap the tail, we should blow up. Rather than catch this case here, | |
964 | * we depend on other ASSERTions in other parts of the code. XXXmiken | |
965 | * | |
966 | * This code also handles the case where the reservation head is behind | |
967 | * the tail. The details of this case are described below, but the end | |
968 | * result is that we return the size of the log as the amount of space left. | |
969 | */ | |
a8272ce0 | 970 | STATIC int |
1da177e4 LT |
971 | xlog_space_left(xlog_t *log, int cycle, int bytes) |
972 | { | |
973 | int free_bytes; | |
974 | int tail_bytes; | |
975 | int tail_cycle; | |
976 | ||
977 | tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn)); | |
978 | tail_cycle = CYCLE_LSN(log->l_tail_lsn); | |
979 | if ((tail_cycle == cycle) && (bytes >= tail_bytes)) { | |
980 | free_bytes = log->l_logsize - (bytes - tail_bytes); | |
981 | } else if ((tail_cycle + 1) < cycle) { | |
982 | return 0; | |
983 | } else if (tail_cycle < cycle) { | |
984 | ASSERT(tail_cycle == (cycle - 1)); | |
985 | free_bytes = tail_bytes - bytes; | |
986 | } else { | |
987 | /* | |
988 | * The reservation head is behind the tail. | |
989 | * In this case we just want to return the size of the | |
990 | * log as the amount of space left. | |
991 | */ | |
992 | xfs_fs_cmn_err(CE_ALERT, log->l_mp, | |
993 | "xlog_space_left: head behind tail\n" | |
994 | " tail_cycle = %d, tail_bytes = %d\n" | |
995 | " GH cycle = %d, GH bytes = %d", | |
996 | tail_cycle, tail_bytes, cycle, bytes); | |
997 | ASSERT(0); | |
998 | free_bytes = log->l_logsize; | |
999 | } | |
1000 | return free_bytes; | |
1001 | } /* xlog_space_left */ | |
1002 | ||
1003 | ||
1004 | /* | |
1005 | * Log function which is called when an io completes. | |
1006 | * | |
1007 | * The log manager needs its own routine, in order to control what | |
1008 | * happens with the buffer after the write completes. | |
1009 | */ | |
1010 | void | |
1011 | xlog_iodone(xfs_buf_t *bp) | |
1012 | { | |
1013 | xlog_in_core_t *iclog; | |
1014 | xlog_t *l; | |
1015 | int aborted; | |
1016 | ||
1017 | iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); | |
1018 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2); | |
1019 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); | |
1020 | aborted = 0; | |
1da177e4 LT |
1021 | l = iclog->ic_log; |
1022 | ||
0bfefc46 | 1023 | /* |
73f6aa4d CH |
1024 | * If the _XFS_BARRIER_FAILED flag was set by a lower |
1025 | * layer, it means the underlying device no longer supports | |
0bfefc46 DC |
1026 | * barrier I/O. Warn loudly and turn off barriers. |
1027 | */ | |
73f6aa4d CH |
1028 | if (bp->b_flags & _XFS_BARRIER_FAILED) { |
1029 | bp->b_flags &= ~_XFS_BARRIER_FAILED; | |
0bfefc46 DC |
1030 | l->l_mp->m_flags &= ~XFS_MOUNT_BARRIER; |
1031 | xfs_fs_cmn_err(CE_WARN, l->l_mp, | |
1032 | "xlog_iodone: Barriers are no longer supported" | |
1033 | " by device. Disabling barriers\n"); | |
1034 | xfs_buftrace("XLOG_IODONE BARRIERS OFF", bp); | |
1035 | } | |
1036 | ||
1da177e4 LT |
1037 | /* |
1038 | * Race to shutdown the filesystem if we see an error. | |
1039 | */ | |
1040 | if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp, | |
1041 | XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) { | |
1042 | xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp)); | |
1043 | XFS_BUF_STALE(bp); | |
7d04a335 | 1044 | xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 LT |
1045 | /* |
1046 | * This flag will be propagated to the trans-committed | |
1047 | * callback routines to let them know that the log-commit | |
1048 | * didn't succeed. | |
1049 | */ | |
1050 | aborted = XFS_LI_ABORTED; | |
1051 | } else if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
1052 | aborted = XFS_LI_ABORTED; | |
1053 | } | |
3db296f3 DC |
1054 | |
1055 | /* log I/O is always issued ASYNC */ | |
1056 | ASSERT(XFS_BUF_ISASYNC(bp)); | |
1da177e4 | 1057 | xlog_state_done_syncing(iclog, aborted); |
3db296f3 DC |
1058 | /* |
1059 | * do not reference the buffer (bp) here as we could race | |
1060 | * with it being freed after writing the unmount record to the | |
1061 | * log. | |
1062 | */ | |
1063 | ||
1da177e4 LT |
1064 | } /* xlog_iodone */ |
1065 | ||
1066 | /* | |
1067 | * The bdstrat callback function for log bufs. This gives us a central | |
1068 | * place to trap bufs in case we get hit by a log I/O error and need to | |
1069 | * shutdown. Actually, in practice, even when we didn't get a log error, | |
1070 | * we transition the iclogs to IOERROR state *after* flushing all existing | |
1071 | * iclogs to disk. This is because we don't want anymore new transactions to be | |
1072 | * started or completed afterwards. | |
1073 | */ | |
1074 | STATIC int | |
1075 | xlog_bdstrat_cb(struct xfs_buf *bp) | |
1076 | { | |
1077 | xlog_in_core_t *iclog; | |
1078 | ||
1079 | iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *); | |
1080 | ||
1081 | if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) { | |
1082 | /* note for irix bstrat will need struct bdevsw passed | |
1083 | * Fix the following macro if the code ever is merged | |
1084 | */ | |
1085 | XFS_bdstrat(bp); | |
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | xfs_buftrace("XLOG__BDSTRAT IOERROR", bp); | |
1090 | XFS_BUF_ERROR(bp, EIO); | |
1091 | XFS_BUF_STALE(bp); | |
1092 | xfs_biodone(bp); | |
014c2544 | 1093 | return XFS_ERROR(EIO); |
1da177e4 LT |
1094 | |
1095 | ||
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * Return size of each in-core log record buffer. | |
1100 | * | |
1cb51258 | 1101 | * All machines get 8 x 32KB buffers by default, unless tuned otherwise. |
1da177e4 LT |
1102 | * |
1103 | * If the filesystem blocksize is too large, we may need to choose a | |
1104 | * larger size since the directory code currently logs entire blocks. | |
1105 | */ | |
1106 | ||
1107 | STATIC void | |
1108 | xlog_get_iclog_buffer_size(xfs_mount_t *mp, | |
1109 | xlog_t *log) | |
1110 | { | |
1111 | int size; | |
1112 | int xhdrs; | |
1113 | ||
1cb51258 ES |
1114 | if (mp->m_logbufs <= 0) |
1115 | log->l_iclog_bufs = XLOG_MAX_ICLOGS; | |
1116 | else | |
cfcbbbd0 | 1117 | log->l_iclog_bufs = mp->m_logbufs; |
1da177e4 LT |
1118 | |
1119 | /* | |
1120 | * Buffer size passed in from mount system call. | |
1121 | */ | |
cfcbbbd0 | 1122 | if (mp->m_logbsize > 0) { |
1da177e4 LT |
1123 | size = log->l_iclog_size = mp->m_logbsize; |
1124 | log->l_iclog_size_log = 0; | |
1125 | while (size != 1) { | |
1126 | log->l_iclog_size_log++; | |
1127 | size >>= 1; | |
1128 | } | |
1129 | ||
62118709 | 1130 | if (xfs_sb_version_haslogv2(&mp->m_sb)) { |
1da177e4 LT |
1131 | /* # headers = size / 32K |
1132 | * one header holds cycles from 32K of data | |
1133 | */ | |
1134 | ||
1135 | xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE; | |
1136 | if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE) | |
1137 | xhdrs++; | |
1138 | log->l_iclog_hsize = xhdrs << BBSHIFT; | |
1139 | log->l_iclog_heads = xhdrs; | |
1140 | } else { | |
1141 | ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE); | |
1142 | log->l_iclog_hsize = BBSIZE; | |
1143 | log->l_iclog_heads = 1; | |
1144 | } | |
cfcbbbd0 | 1145 | goto done; |
1da177e4 LT |
1146 | } |
1147 | ||
1cb51258 ES |
1148 | /* All machines use 32KB buffers by default. */ |
1149 | log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; | |
1150 | log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT; | |
1da177e4 LT |
1151 | |
1152 | /* the default log size is 16k or 32k which is one header sector */ | |
1153 | log->l_iclog_hsize = BBSIZE; | |
1154 | log->l_iclog_heads = 1; | |
1155 | ||
7153f8ba CH |
1156 | done: |
1157 | /* are we being asked to make the sizes selected above visible? */ | |
cfcbbbd0 NS |
1158 | if (mp->m_logbufs == 0) |
1159 | mp->m_logbufs = log->l_iclog_bufs; | |
1160 | if (mp->m_logbsize == 0) | |
1161 | mp->m_logbsize = log->l_iclog_size; | |
1da177e4 LT |
1162 | } /* xlog_get_iclog_buffer_size */ |
1163 | ||
1164 | ||
1165 | /* | |
1166 | * This routine initializes some of the log structure for a given mount point. | |
1167 | * Its primary purpose is to fill in enough, so recovery can occur. However, | |
1168 | * some other stuff may be filled in too. | |
1169 | */ | |
1170 | STATIC xlog_t * | |
1171 | xlog_alloc_log(xfs_mount_t *mp, | |
1172 | xfs_buftarg_t *log_target, | |
1173 | xfs_daddr_t blk_offset, | |
1174 | int num_bblks) | |
1175 | { | |
1176 | xlog_t *log; | |
1177 | xlog_rec_header_t *head; | |
1178 | xlog_in_core_t **iclogp; | |
1179 | xlog_in_core_t *iclog, *prev_iclog=NULL; | |
1180 | xfs_buf_t *bp; | |
1181 | int i; | |
1182 | int iclogsize; | |
1183 | ||
644c3567 DC |
1184 | log = kmem_zalloc(sizeof(xlog_t), KM_MAYFAIL); |
1185 | if (!log) | |
1186 | return NULL; | |
1da177e4 LT |
1187 | |
1188 | log->l_mp = mp; | |
1189 | log->l_targ = log_target; | |
1190 | log->l_logsize = BBTOB(num_bblks); | |
1191 | log->l_logBBstart = blk_offset; | |
1192 | log->l_logBBsize = num_bblks; | |
1193 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
1194 | log->l_flags |= XLOG_ACTIVE_RECOVERY; | |
1195 | ||
1196 | log->l_prev_block = -1; | |
03bea6fe | 1197 | log->l_tail_lsn = xlog_assign_lsn(1, 0); |
1da177e4 LT |
1198 | /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */ |
1199 | log->l_last_sync_lsn = log->l_tail_lsn; | |
1200 | log->l_curr_cycle = 1; /* 0 is bad since this is initial value */ | |
1201 | log->l_grant_reserve_cycle = 1; | |
1202 | log->l_grant_write_cycle = 1; | |
1203 | ||
62118709 | 1204 | if (xfs_sb_version_hassector(&mp->m_sb)) { |
1da177e4 LT |
1205 | log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT; |
1206 | ASSERT(log->l_sectbb_log <= mp->m_sectbb_log); | |
1207 | /* for larger sector sizes, must have v2 or external log */ | |
1208 | ASSERT(log->l_sectbb_log == 0 || | |
1209 | log->l_logBBstart == 0 || | |
62118709 | 1210 | xfs_sb_version_haslogv2(&mp->m_sb)); |
1da177e4 LT |
1211 | ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT); |
1212 | } | |
1213 | log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1; | |
1214 | ||
1215 | xlog_get_iclog_buffer_size(mp, log); | |
1216 | ||
1217 | bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp); | |
644c3567 DC |
1218 | if (!bp) |
1219 | goto out_free_log; | |
1da177e4 LT |
1220 | XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); |
1221 | XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); | |
1222 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); | |
1223 | ASSERT(XFS_BUF_ISBUSY(bp)); | |
1224 | ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); | |
1225 | log->l_xbuf = bp; | |
1226 | ||
007c61c6 ES |
1227 | spin_lock_init(&log->l_icloglock); |
1228 | spin_lock_init(&log->l_grant_lock); | |
d748c623 | 1229 | sv_init(&log->l_flush_wait, 0, "flush_wait"); |
1da177e4 | 1230 | |
31bd61f2 | 1231 | xlog_trace_loggrant_alloc(log); |
1da177e4 LT |
1232 | /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */ |
1233 | ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0); | |
1234 | ||
1235 | iclogp = &log->l_iclog; | |
1236 | /* | |
1237 | * The amount of memory to allocate for the iclog structure is | |
1238 | * rather funky due to the way the structure is defined. It is | |
1239 | * done this way so that we can use different sizes for machines | |
1240 | * with different amounts of memory. See the definition of | |
1241 | * xlog_in_core_t in xfs_log_priv.h for details. | |
1242 | */ | |
1243 | iclogsize = log->l_iclog_size; | |
1244 | ASSERT(log->l_iclog_size >= 4096); | |
1245 | for (i=0; i < log->l_iclog_bufs; i++) { | |
644c3567 DC |
1246 | *iclogp = kmem_zalloc(sizeof(xlog_in_core_t), KM_MAYFAIL); |
1247 | if (!*iclogp) | |
1248 | goto out_free_iclog; | |
1249 | ||
1da177e4 | 1250 | iclog = *iclogp; |
1da177e4 LT |
1251 | iclog->ic_prev = prev_iclog; |
1252 | prev_iclog = iclog; | |
1fa40b01 CH |
1253 | |
1254 | bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp); | |
644c3567 DC |
1255 | if (!bp) |
1256 | goto out_free_iclog; | |
1fa40b01 CH |
1257 | if (!XFS_BUF_CPSEMA(bp)) |
1258 | ASSERT(0); | |
1259 | XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone); | |
1260 | XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb); | |
1261 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1); | |
1262 | iclog->ic_bp = bp; | |
b28708d6 | 1263 | iclog->ic_data = bp->b_addr; |
4679b2d3 | 1264 | #ifdef DEBUG |
1da177e4 | 1265 | log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header); |
4679b2d3 | 1266 | #endif |
1da177e4 LT |
1267 | head = &iclog->ic_header; |
1268 | memset(head, 0, sizeof(xlog_rec_header_t)); | |
b53e675d CH |
1269 | head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM); |
1270 | head->h_version = cpu_to_be32( | |
62118709 | 1271 | xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? 2 : 1); |
b53e675d | 1272 | head->h_size = cpu_to_be32(log->l_iclog_size); |
1da177e4 | 1273 | /* new fields */ |
b53e675d | 1274 | head->h_fmt = cpu_to_be32(XLOG_FMT); |
1da177e4 LT |
1275 | memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t)); |
1276 | ||
1da177e4 LT |
1277 | iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize; |
1278 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
1279 | iclog->ic_log = log; | |
114d23aa DC |
1280 | atomic_set(&iclog->ic_refcnt, 0); |
1281 | spin_lock_init(&iclog->ic_callback_lock); | |
1da177e4 | 1282 | iclog->ic_callback_tail = &(iclog->ic_callback); |
b28708d6 | 1283 | iclog->ic_datap = (char *)iclog->ic_data + log->l_iclog_hsize; |
1da177e4 LT |
1284 | |
1285 | ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp)); | |
1286 | ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0); | |
12017faf DC |
1287 | sv_init(&iclog->ic_force_wait, SV_DEFAULT, "iclog-force"); |
1288 | sv_init(&iclog->ic_write_wait, SV_DEFAULT, "iclog-write"); | |
1da177e4 | 1289 | |
31bd61f2 LM |
1290 | xlog_trace_iclog_alloc(iclog); |
1291 | ||
1da177e4 LT |
1292 | iclogp = &iclog->ic_next; |
1293 | } | |
1294 | *iclogp = log->l_iclog; /* complete ring */ | |
1295 | log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */ | |
1296 | ||
1297 | return log; | |
644c3567 DC |
1298 | |
1299 | out_free_iclog: | |
1300 | for (iclog = log->l_iclog; iclog; iclog = prev_iclog) { | |
1301 | prev_iclog = iclog->ic_next; | |
1302 | if (iclog->ic_bp) { | |
1303 | sv_destroy(&iclog->ic_force_wait); | |
1304 | sv_destroy(&iclog->ic_write_wait); | |
1305 | xfs_buf_free(iclog->ic_bp); | |
1306 | xlog_trace_iclog_dealloc(iclog); | |
1307 | } | |
1308 | kmem_free(iclog); | |
1309 | } | |
1310 | spinlock_destroy(&log->l_icloglock); | |
1311 | spinlock_destroy(&log->l_grant_lock); | |
1312 | xlog_trace_loggrant_dealloc(log); | |
1313 | xfs_buf_free(log->l_xbuf); | |
1314 | out_free_log: | |
1315 | kmem_free(log); | |
1316 | return NULL; | |
1da177e4 LT |
1317 | } /* xlog_alloc_log */ |
1318 | ||
1319 | ||
1320 | /* | |
1321 | * Write out the commit record of a transaction associated with the given | |
1322 | * ticket. Return the lsn of the commit record. | |
1323 | */ | |
1324 | STATIC int | |
1325 | xlog_commit_record(xfs_mount_t *mp, | |
1326 | xlog_ticket_t *ticket, | |
1327 | xlog_in_core_t **iclog, | |
1328 | xfs_lsn_t *commitlsnp) | |
1329 | { | |
1330 | int error; | |
1331 | xfs_log_iovec_t reg[1]; | |
1332 | ||
1333 | reg[0].i_addr = NULL; | |
1334 | reg[0].i_len = 0; | |
7e9c6396 | 1335 | XLOG_VEC_SET_TYPE(®[0], XLOG_REG_TYPE_COMMIT); |
1da177e4 LT |
1336 | |
1337 | ASSERT_ALWAYS(iclog); | |
1338 | if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp, | |
1339 | iclog, XLOG_COMMIT_TRANS))) { | |
7d04a335 | 1340 | xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR); |
1da177e4 | 1341 | } |
014c2544 | 1342 | return error; |
1da177e4 LT |
1343 | } /* xlog_commit_record */ |
1344 | ||
1345 | ||
1346 | /* | |
1347 | * Push on the buffer cache code if we ever use more than 75% of the on-disk | |
1348 | * log space. This code pushes on the lsn which would supposedly free up | |
1349 | * the 25% which we want to leave free. We may need to adopt a policy which | |
1350 | * pushes on an lsn which is further along in the log once we reach the high | |
1351 | * water mark. In this manner, we would be creating a low water mark. | |
1352 | */ | |
a8272ce0 | 1353 | STATIC void |
1da177e4 LT |
1354 | xlog_grant_push_ail(xfs_mount_t *mp, |
1355 | int need_bytes) | |
1356 | { | |
1357 | xlog_t *log = mp->m_log; /* pointer to the log */ | |
1358 | xfs_lsn_t tail_lsn; /* lsn of the log tail */ | |
1359 | xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */ | |
1360 | int free_blocks; /* free blocks left to write to */ | |
1361 | int free_bytes; /* free bytes left to write to */ | |
1362 | int threshold_block; /* block in lsn we'd like to be at */ | |
1363 | int threshold_cycle; /* lsn cycle we'd like to be at */ | |
1364 | int free_threshold; | |
1da177e4 LT |
1365 | |
1366 | ASSERT(BTOBB(need_bytes) < log->l_logBBsize); | |
1367 | ||
c8b5ea28 | 1368 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
1369 | free_bytes = xlog_space_left(log, |
1370 | log->l_grant_reserve_cycle, | |
1371 | log->l_grant_reserve_bytes); | |
1372 | tail_lsn = log->l_tail_lsn; | |
1373 | free_blocks = BTOBBT(free_bytes); | |
1374 | ||
1375 | /* | |
1376 | * Set the threshold for the minimum number of free blocks in the | |
1377 | * log to the maximum of what the caller needs, one quarter of the | |
1378 | * log, and 256 blocks. | |
1379 | */ | |
1380 | free_threshold = BTOBB(need_bytes); | |
1381 | free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2)); | |
1382 | free_threshold = MAX(free_threshold, 256); | |
1383 | if (free_blocks < free_threshold) { | |
1384 | threshold_block = BLOCK_LSN(tail_lsn) + free_threshold; | |
1385 | threshold_cycle = CYCLE_LSN(tail_lsn); | |
1386 | if (threshold_block >= log->l_logBBsize) { | |
1387 | threshold_block -= log->l_logBBsize; | |
1388 | threshold_cycle += 1; | |
1389 | } | |
03bea6fe | 1390 | threshold_lsn = xlog_assign_lsn(threshold_cycle, threshold_block); |
1da177e4 LT |
1391 | |
1392 | /* Don't pass in an lsn greater than the lsn of the last | |
1393 | * log record known to be on disk. | |
1394 | */ | |
1395 | if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0) | |
1396 | threshold_lsn = log->l_last_sync_lsn; | |
1397 | } | |
c8b5ea28 | 1398 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
1399 | |
1400 | /* | |
1401 | * Get the transaction layer to kick the dirty buffers out to | |
1402 | * disk asynchronously. No point in trying to do this if | |
1403 | * the filesystem is shutting down. | |
1404 | */ | |
1405 | if (threshold_lsn && | |
1406 | !XLOG_FORCED_SHUTDOWN(log)) | |
783a2f65 | 1407 | xfs_trans_ail_push(log->l_ailp, threshold_lsn); |
1da177e4 LT |
1408 | } /* xlog_grant_push_ail */ |
1409 | ||
1410 | ||
1411 | /* | |
1412 | * Flush out the in-core log (iclog) to the on-disk log in an asynchronous | |
1413 | * fashion. Previously, we should have moved the current iclog | |
1414 | * ptr in the log to point to the next available iclog. This allows further | |
1415 | * write to continue while this code syncs out an iclog ready to go. | |
1416 | * Before an in-core log can be written out, the data section must be scanned | |
1417 | * to save away the 1st word of each BBSIZE block into the header. We replace | |
1418 | * it with the current cycle count. Each BBSIZE block is tagged with the | |
1419 | * cycle count because there in an implicit assumption that drives will | |
1420 | * guarantee that entire 512 byte blocks get written at once. In other words, | |
1421 | * we can't have part of a 512 byte block written and part not written. By | |
1422 | * tagging each block, we will know which blocks are valid when recovering | |
1423 | * after an unclean shutdown. | |
1424 | * | |
1425 | * This routine is single threaded on the iclog. No other thread can be in | |
1426 | * this routine with the same iclog. Changing contents of iclog can there- | |
1427 | * fore be done without grabbing the state machine lock. Updating the global | |
1428 | * log will require grabbing the lock though. | |
1429 | * | |
1430 | * The entire log manager uses a logical block numbering scheme. Only | |
1431 | * log_sync (and then only bwrite()) know about the fact that the log may | |
1432 | * not start with block zero on a given device. The log block start offset | |
1433 | * is added immediately before calling bwrite(). | |
1434 | */ | |
1435 | ||
a8272ce0 | 1436 | STATIC int |
1da177e4 LT |
1437 | xlog_sync(xlog_t *log, |
1438 | xlog_in_core_t *iclog) | |
1439 | { | |
1440 | xfs_caddr_t dptr; /* pointer to byte sized element */ | |
1441 | xfs_buf_t *bp; | |
b53e675d | 1442 | int i; |
1da177e4 LT |
1443 | uint count; /* byte count of bwrite */ |
1444 | uint count_init; /* initial count before roundup */ | |
1445 | int roundoff; /* roundoff to BB or stripe */ | |
1446 | int split = 0; /* split write into two regions */ | |
1447 | int error; | |
62118709 | 1448 | int v2 = xfs_sb_version_haslogv2(&log->l_mp->m_sb); |
1da177e4 LT |
1449 | |
1450 | XFS_STATS_INC(xs_log_writes); | |
155cc6b7 | 1451 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
1452 | |
1453 | /* Add for LR header */ | |
1454 | count_init = log->l_iclog_hsize + iclog->ic_offset; | |
1455 | ||
1456 | /* Round out the log write size */ | |
1457 | if (v2 && log->l_mp->m_sb.sb_logsunit > 1) { | |
1458 | /* we have a v2 stripe unit to use */ | |
1459 | count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init)); | |
1460 | } else { | |
1461 | count = BBTOB(BTOBB(count_init)); | |
1462 | } | |
1463 | roundoff = count - count_init; | |
1464 | ASSERT(roundoff >= 0); | |
1465 | ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 && | |
1466 | roundoff < log->l_mp->m_sb.sb_logsunit) | |
1467 | || | |
1468 | (log->l_mp->m_sb.sb_logsunit <= 1 && | |
1469 | roundoff < BBTOB(1))); | |
1470 | ||
1471 | /* move grant heads by roundoff in sync */ | |
c8b5ea28 | 1472 | spin_lock(&log->l_grant_lock); |
dd954c69 | 1473 | xlog_grant_add_space(log, roundoff); |
c8b5ea28 | 1474 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
1475 | |
1476 | /* put cycle number in every block */ | |
1477 | xlog_pack_data(log, iclog, roundoff); | |
1478 | ||
1479 | /* real byte length */ | |
1480 | if (v2) { | |
b53e675d CH |
1481 | iclog->ic_header.h_len = |
1482 | cpu_to_be32(iclog->ic_offset + roundoff); | |
1da177e4 | 1483 | } else { |
b53e675d CH |
1484 | iclog->ic_header.h_len = |
1485 | cpu_to_be32(iclog->ic_offset); | |
1da177e4 LT |
1486 | } |
1487 | ||
f5faad79 | 1488 | bp = iclog->ic_bp; |
1da177e4 LT |
1489 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1); |
1490 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); | |
b53e675d | 1491 | XFS_BUF_SET_ADDR(bp, BLOCK_LSN(be64_to_cpu(iclog->ic_header.h_lsn))); |
1da177e4 LT |
1492 | |
1493 | XFS_STATS_ADD(xs_log_blocks, BTOBB(count)); | |
1494 | ||
1495 | /* Do we need to split this write into 2 parts? */ | |
1496 | if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) { | |
1497 | split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp))); | |
1498 | count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)); | |
1499 | iclog->ic_bwritecnt = 2; /* split into 2 writes */ | |
1500 | } else { | |
1501 | iclog->ic_bwritecnt = 1; | |
1502 | } | |
511105b3 | 1503 | XFS_BUF_SET_COUNT(bp, count); |
1da177e4 | 1504 | XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */ |
f5faad79 | 1505 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 LT |
1506 | XFS_BUF_BUSY(bp); |
1507 | XFS_BUF_ASYNC(bp); | |
1508 | /* | |
f538d4da | 1509 | * Do an ordered write for the log block. |
f5faad79 | 1510 | * Its unnecessary to flush the first split block in the log wrap case. |
1da177e4 | 1511 | */ |
f5faad79 | 1512 | if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER)) |
f538d4da | 1513 | XFS_BUF_ORDERED(bp); |
1da177e4 LT |
1514 | |
1515 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1516 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1517 | ||
1518 | xlog_verify_iclog(log, iclog, count, B_TRUE); | |
1519 | ||
1520 | /* account for log which doesn't start at block #0 */ | |
1521 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); | |
1522 | /* | |
1523 | * Don't call xfs_bwrite here. We do log-syncs even when the filesystem | |
1524 | * is shutting down. | |
1525 | */ | |
1526 | XFS_BUF_WRITE(bp); | |
1527 | ||
1528 | if ((error = XFS_bwrite(bp))) { | |
1529 | xfs_ioerror_alert("xlog_sync", log->l_mp, bp, | |
1530 | XFS_BUF_ADDR(bp)); | |
014c2544 | 1531 | return error; |
1da177e4 LT |
1532 | } |
1533 | if (split) { | |
f5faad79 | 1534 | bp = iclog->ic_log->l_xbuf; |
1da177e4 LT |
1535 | ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == |
1536 | (unsigned long)1); | |
1537 | XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2); | |
1538 | XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */ | |
1539 | XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+ | |
1540 | (__psint_t)count), split); | |
1541 | XFS_BUF_SET_FSPRIVATE(bp, iclog); | |
f5faad79 | 1542 | XFS_BUF_ZEROFLAGS(bp); |
1da177e4 LT |
1543 | XFS_BUF_BUSY(bp); |
1544 | XFS_BUF_ASYNC(bp); | |
f538d4da CH |
1545 | if (log->l_mp->m_flags & XFS_MOUNT_BARRIER) |
1546 | XFS_BUF_ORDERED(bp); | |
1da177e4 LT |
1547 | dptr = XFS_BUF_PTR(bp); |
1548 | /* | |
1549 | * Bump the cycle numbers at the start of each block | |
1550 | * since this part of the buffer is at the start of | |
1551 | * a new cycle. Watch out for the header magic number | |
1552 | * case, though. | |
1553 | */ | |
b53e675d | 1554 | for (i = 0; i < split; i += BBSIZE) { |
413d57c9 | 1555 | be32_add_cpu((__be32 *)dptr, 1); |
b53e675d | 1556 | if (be32_to_cpu(*(__be32 *)dptr) == XLOG_HEADER_MAGIC_NUM) |
413d57c9 | 1557 | be32_add_cpu((__be32 *)dptr, 1); |
1da177e4 LT |
1558 | dptr += BBSIZE; |
1559 | } | |
1560 | ||
1561 | ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1); | |
1562 | ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize); | |
1563 | ||
c41564b5 | 1564 | /* account for internal log which doesn't start at block #0 */ |
1da177e4 LT |
1565 | XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart); |
1566 | XFS_BUF_WRITE(bp); | |
1567 | if ((error = XFS_bwrite(bp))) { | |
1568 | xfs_ioerror_alert("xlog_sync (split)", log->l_mp, | |
1569 | bp, XFS_BUF_ADDR(bp)); | |
014c2544 | 1570 | return error; |
1da177e4 LT |
1571 | } |
1572 | } | |
014c2544 | 1573 | return 0; |
1da177e4 LT |
1574 | } /* xlog_sync */ |
1575 | ||
1576 | ||
1577 | /* | |
c41564b5 | 1578 | * Deallocate a log structure |
1da177e4 | 1579 | */ |
a8272ce0 | 1580 | STATIC void |
c41564b5 | 1581 | xlog_dealloc_log(xlog_t *log) |
1da177e4 LT |
1582 | { |
1583 | xlog_in_core_t *iclog, *next_iclog; | |
1da177e4 LT |
1584 | int i; |
1585 | ||
1da177e4 LT |
1586 | iclog = log->l_iclog; |
1587 | for (i=0; i<log->l_iclog_bufs; i++) { | |
12017faf DC |
1588 | sv_destroy(&iclog->ic_force_wait); |
1589 | sv_destroy(&iclog->ic_write_wait); | |
1da177e4 | 1590 | xfs_buf_free(iclog->ic_bp); |
31bd61f2 | 1591 | xlog_trace_iclog_dealloc(iclog); |
1da177e4 | 1592 | next_iclog = iclog->ic_next; |
f0e2d93c | 1593 | kmem_free(iclog); |
1da177e4 LT |
1594 | iclog = next_iclog; |
1595 | } | |
1da177e4 LT |
1596 | spinlock_destroy(&log->l_icloglock); |
1597 | spinlock_destroy(&log->l_grant_lock); | |
1598 | ||
1da177e4 | 1599 | xfs_buf_free(log->l_xbuf); |
31bd61f2 | 1600 | xlog_trace_loggrant_dealloc(log); |
1da177e4 | 1601 | log->l_mp->m_log = NULL; |
f0e2d93c | 1602 | kmem_free(log); |
c41564b5 | 1603 | } /* xlog_dealloc_log */ |
1da177e4 LT |
1604 | |
1605 | /* | |
1606 | * Update counters atomically now that memcpy is done. | |
1607 | */ | |
1608 | /* ARGSUSED */ | |
1609 | static inline void | |
1610 | xlog_state_finish_copy(xlog_t *log, | |
1611 | xlog_in_core_t *iclog, | |
1612 | int record_cnt, | |
1613 | int copy_bytes) | |
1614 | { | |
b22cd72c | 1615 | spin_lock(&log->l_icloglock); |
1da177e4 | 1616 | |
413d57c9 | 1617 | be32_add_cpu(&iclog->ic_header.h_num_logops, record_cnt); |
1da177e4 LT |
1618 | iclog->ic_offset += copy_bytes; |
1619 | ||
b22cd72c | 1620 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
1621 | } /* xlog_state_finish_copy */ |
1622 | ||
1623 | ||
1624 | ||
1625 | ||
7e9c6396 TS |
1626 | /* |
1627 | * print out info relating to regions written which consume | |
1628 | * the reservation | |
1629 | */ | |
7e9c6396 TS |
1630 | STATIC void |
1631 | xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket) | |
1632 | { | |
1633 | uint i; | |
1634 | uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t); | |
1635 | ||
1636 | /* match with XLOG_REG_TYPE_* in xfs_log.h */ | |
1637 | static char *res_type_str[XLOG_REG_TYPE_MAX] = { | |
1638 | "bformat", | |
1639 | "bchunk", | |
1640 | "efi_format", | |
1641 | "efd_format", | |
1642 | "iformat", | |
1643 | "icore", | |
1644 | "iext", | |
1645 | "ibroot", | |
1646 | "ilocal", | |
1647 | "iattr_ext", | |
1648 | "iattr_broot", | |
1649 | "iattr_local", | |
1650 | "qformat", | |
1651 | "dquot", | |
1652 | "quotaoff", | |
1653 | "LR header", | |
1654 | "unmount", | |
1655 | "commit", | |
1656 | "trans header" | |
1657 | }; | |
1658 | static char *trans_type_str[XFS_TRANS_TYPE_MAX] = { | |
1659 | "SETATTR_NOT_SIZE", | |
1660 | "SETATTR_SIZE", | |
1661 | "INACTIVE", | |
1662 | "CREATE", | |
1663 | "CREATE_TRUNC", | |
1664 | "TRUNCATE_FILE", | |
1665 | "REMOVE", | |
1666 | "LINK", | |
1667 | "RENAME", | |
1668 | "MKDIR", | |
1669 | "RMDIR", | |
1670 | "SYMLINK", | |
1671 | "SET_DMATTRS", | |
1672 | "GROWFS", | |
1673 | "STRAT_WRITE", | |
1674 | "DIOSTRAT", | |
1675 | "WRITE_SYNC", | |
1676 | "WRITEID", | |
1677 | "ADDAFORK", | |
1678 | "ATTRINVAL", | |
1679 | "ATRUNCATE", | |
1680 | "ATTR_SET", | |
1681 | "ATTR_RM", | |
1682 | "ATTR_FLAG", | |
1683 | "CLEAR_AGI_BUCKET", | |
1684 | "QM_SBCHANGE", | |
1685 | "DUMMY1", | |
1686 | "DUMMY2", | |
1687 | "QM_QUOTAOFF", | |
1688 | "QM_DQALLOC", | |
1689 | "QM_SETQLIM", | |
1690 | "QM_DQCLUSTER", | |
1691 | "QM_QINOCREATE", | |
1692 | "QM_QUOTAOFF_END", | |
1693 | "SB_UNIT", | |
1694 | "FSYNC_TS", | |
1695 | "GROWFSRT_ALLOC", | |
1696 | "GROWFSRT_ZERO", | |
1697 | "GROWFSRT_FREE", | |
1698 | "SWAPEXT" | |
1699 | }; | |
1700 | ||
1701 | xfs_fs_cmn_err(CE_WARN, mp, | |
1702 | "xfs_log_write: reservation summary:\n" | |
1703 | " trans type = %s (%u)\n" | |
1704 | " unit res = %d bytes\n" | |
1705 | " current res = %d bytes\n" | |
1706 | " total reg = %u bytes (o/flow = %u bytes)\n" | |
1707 | " ophdrs = %u (ophdr space = %u bytes)\n" | |
1708 | " ophdr + reg = %u bytes\n" | |
1709 | " num regions = %u\n", | |
1710 | ((ticket->t_trans_type <= 0 || | |
1711 | ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ? | |
1712 | "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]), | |
1713 | ticket->t_trans_type, | |
1714 | ticket->t_unit_res, | |
1715 | ticket->t_curr_res, | |
1716 | ticket->t_res_arr_sum, ticket->t_res_o_flow, | |
1717 | ticket->t_res_num_ophdrs, ophdr_spc, | |
1718 | ticket->t_res_arr_sum + | |
1259845d | 1719 | ticket->t_res_o_flow + ophdr_spc, |
7e9c6396 TS |
1720 | ticket->t_res_num); |
1721 | ||
1722 | for (i = 0; i < ticket->t_res_num; i++) { | |
1259845d | 1723 | uint r_type = ticket->t_res_arr[i].r_type; |
7e9c6396 TS |
1724 | cmn_err(CE_WARN, |
1725 | "region[%u]: %s - %u bytes\n", | |
1726 | i, | |
1727 | ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ? | |
1728 | "bad-rtype" : res_type_str[r_type-1]), | |
1729 | ticket->t_res_arr[i].r_len); | |
1730 | } | |
1731 | } | |
7e9c6396 | 1732 | |
1da177e4 LT |
1733 | /* |
1734 | * Write some region out to in-core log | |
1735 | * | |
1736 | * This will be called when writing externally provided regions or when | |
1737 | * writing out a commit record for a given transaction. | |
1738 | * | |
1739 | * General algorithm: | |
1740 | * 1. Find total length of this write. This may include adding to the | |
1741 | * lengths passed in. | |
1742 | * 2. Check whether we violate the tickets reservation. | |
1743 | * 3. While writing to this iclog | |
1744 | * A. Reserve as much space in this iclog as can get | |
1745 | * B. If this is first write, save away start lsn | |
1746 | * C. While writing this region: | |
1747 | * 1. If first write of transaction, write start record | |
1748 | * 2. Write log operation header (header per region) | |
1749 | * 3. Find out if we can fit entire region into this iclog | |
1750 | * 4. Potentially, verify destination memcpy ptr | |
1751 | * 5. Memcpy (partial) region | |
1752 | * 6. If partial copy, release iclog; otherwise, continue | |
1753 | * copying more regions into current iclog | |
1754 | * 4. Mark want sync bit (in simulation mode) | |
1755 | * 5. Release iclog for potential flush to on-disk log. | |
1756 | * | |
1757 | * ERRORS: | |
1758 | * 1. Panic if reservation is overrun. This should never happen since | |
1759 | * reservation amounts are generated internal to the filesystem. | |
1760 | * NOTES: | |
1761 | * 1. Tickets are single threaded data structures. | |
1762 | * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the | |
1763 | * syncing routine. When a single log_write region needs to span | |
1764 | * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set | |
1765 | * on all log operation writes which don't contain the end of the | |
1766 | * region. The XLOG_END_TRANS bit is used for the in-core log | |
1767 | * operation which contains the end of the continued log_write region. | |
1768 | * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog, | |
1769 | * we don't really know exactly how much space will be used. As a result, | |
1770 | * we don't update ic_offset until the end when we know exactly how many | |
1771 | * bytes have been written out. | |
1772 | */ | |
a8272ce0 | 1773 | STATIC int |
1da177e4 LT |
1774 | xlog_write(xfs_mount_t * mp, |
1775 | xfs_log_iovec_t reg[], | |
1776 | int nentries, | |
1777 | xfs_log_ticket_t tic, | |
1778 | xfs_lsn_t *start_lsn, | |
1779 | xlog_in_core_t **commit_iclog, | |
1780 | uint flags) | |
1781 | { | |
5493a0fc | 1782 | xlog_t *log = mp->m_log; |
1da177e4 | 1783 | xlog_ticket_t *ticket = (xlog_ticket_t *)tic; |
5493a0fc | 1784 | xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */ |
1da177e4 | 1785 | xlog_op_header_t *logop_head; /* ptr to log operation header */ |
1da177e4 LT |
1786 | __psint_t ptr; /* copy address into data region */ |
1787 | int len; /* # xlog_write() bytes 2 still copy */ | |
1788 | int index; /* region index currently copying */ | |
1789 | int log_offset; /* offset (from 0) into data region */ | |
1790 | int start_rec_copy; /* # bytes to copy for start record */ | |
1791 | int partial_copy; /* did we split a region? */ | |
1792 | int partial_copy_len;/* # bytes copied if split region */ | |
1793 | int need_copy; /* # bytes need to memcpy this region */ | |
1794 | int copy_len; /* # bytes actually memcpy'ing */ | |
1795 | int copy_off; /* # bytes from entry start */ | |
1796 | int contwr; /* continued write of in-core log? */ | |
1797 | int error; | |
1798 | int record_cnt = 0, data_cnt = 0; | |
1799 | ||
1800 | partial_copy_len = partial_copy = 0; | |
1801 | ||
1802 | /* Calculate potential maximum space. Each region gets its own | |
1803 | * xlog_op_header_t and may need to be double word aligned. | |
1804 | */ | |
1805 | len = 0; | |
7e9c6396 | 1806 | if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */ |
1da177e4 | 1807 | len += sizeof(xlog_op_header_t); |
0adba536 | 1808 | ticket->t_res_num_ophdrs++; |
7e9c6396 | 1809 | } |
1da177e4 LT |
1810 | |
1811 | for (index = 0; index < nentries; index++) { | |
1812 | len += sizeof(xlog_op_header_t); /* each region gets >= 1 */ | |
0adba536 | 1813 | ticket->t_res_num_ophdrs++; |
1da177e4 | 1814 | len += reg[index].i_len; |
0adba536 | 1815 | xlog_tic_add_region(ticket, reg[index].i_len, reg[index].i_type); |
1da177e4 LT |
1816 | } |
1817 | contwr = *start_lsn = 0; | |
1818 | ||
1819 | if (ticket->t_curr_res < len) { | |
7e9c6396 | 1820 | xlog_print_tic_res(mp, ticket); |
1da177e4 LT |
1821 | #ifdef DEBUG |
1822 | xlog_panic( | |
1823 | "xfs_log_write: reservation ran out. Need to up reservation"); | |
1824 | #else | |
1825 | /* Customer configurable panic */ | |
1826 | xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp, | |
1827 | "xfs_log_write: reservation ran out. Need to up reservation"); | |
1828 | /* If we did not panic, shutdown the filesystem */ | |
7d04a335 | 1829 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
1da177e4 LT |
1830 | #endif |
1831 | } else | |
1832 | ticket->t_curr_res -= len; | |
1833 | ||
1834 | for (index = 0; index < nentries; ) { | |
1835 | if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket, | |
1836 | &contwr, &log_offset))) | |
014c2544 | 1837 | return error; |
1da177e4 LT |
1838 | |
1839 | ASSERT(log_offset <= iclog->ic_size - 1); | |
1840 | ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset); | |
1841 | ||
1842 | /* start_lsn is the first lsn written to. That's all we need. */ | |
1843 | if (! *start_lsn) | |
b53e675d | 1844 | *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
1da177e4 LT |
1845 | |
1846 | /* This loop writes out as many regions as can fit in the amount | |
1847 | * of space which was allocated by xlog_state_get_iclog_space(). | |
1848 | */ | |
1849 | while (index < nentries) { | |
1850 | ASSERT(reg[index].i_len % sizeof(__int32_t) == 0); | |
1851 | ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0); | |
1852 | start_rec_copy = 0; | |
1853 | ||
1854 | /* If first write for transaction, insert start record. | |
1855 | * We can't be trying to commit if we are inited. We can't | |
1856 | * have any "partial_copy" if we are inited. | |
1857 | */ | |
1858 | if (ticket->t_flags & XLOG_TIC_INITED) { | |
1859 | logop_head = (xlog_op_header_t *)ptr; | |
67fcb7bf | 1860 | logop_head->oh_tid = cpu_to_be32(ticket->t_tid); |
1da177e4 LT |
1861 | logop_head->oh_clientid = ticket->t_clientid; |
1862 | logop_head->oh_len = 0; | |
1863 | logop_head->oh_flags = XLOG_START_TRANS; | |
1864 | logop_head->oh_res2 = 0; | |
1865 | ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */ | |
1866 | record_cnt++; | |
1867 | ||
1868 | start_rec_copy = sizeof(xlog_op_header_t); | |
1869 | xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy); | |
1870 | } | |
1871 | ||
1872 | /* Copy log operation header directly into data section */ | |
1873 | logop_head = (xlog_op_header_t *)ptr; | |
67fcb7bf | 1874 | logop_head->oh_tid = cpu_to_be32(ticket->t_tid); |
1da177e4 LT |
1875 | logop_head->oh_clientid = ticket->t_clientid; |
1876 | logop_head->oh_res2 = 0; | |
1877 | ||
1878 | /* header copied directly */ | |
1879 | xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t)); | |
1880 | ||
1881 | /* are we copying a commit or unmount record? */ | |
1882 | logop_head->oh_flags = flags; | |
1883 | ||
1884 | /* | |
1885 | * We've seen logs corrupted with bad transaction client | |
1886 | * ids. This makes sure that XFS doesn't generate them on. | |
1887 | * Turn this into an EIO and shut down the filesystem. | |
1888 | */ | |
1889 | switch (logop_head->oh_clientid) { | |
1890 | case XFS_TRANSACTION: | |
1891 | case XFS_VOLUME: | |
1892 | case XFS_LOG: | |
1893 | break; | |
1894 | default: | |
1895 | xfs_fs_cmn_err(CE_WARN, mp, | |
1896 | "Bad XFS transaction clientid 0x%x in ticket 0x%p", | |
1897 | logop_head->oh_clientid, tic); | |
1898 | return XFS_ERROR(EIO); | |
1899 | } | |
1900 | ||
1901 | /* Partial write last time? => (partial_copy != 0) | |
1902 | * need_copy is the amount we'd like to copy if everything could | |
1903 | * fit in the current memcpy. | |
1904 | */ | |
1905 | need_copy = reg[index].i_len - partial_copy_len; | |
1906 | ||
1907 | copy_off = partial_copy_len; | |
1908 | if (need_copy <= iclog->ic_size - log_offset) { /*complete write */ | |
67fcb7bf CH |
1909 | copy_len = need_copy; |
1910 | logop_head->oh_len = cpu_to_be32(copy_len); | |
1da177e4 LT |
1911 | if (partial_copy) |
1912 | logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS); | |
1913 | partial_copy_len = partial_copy = 0; | |
1914 | } else { /* partial write */ | |
1915 | copy_len = iclog->ic_size - log_offset; | |
67fcb7bf | 1916 | logop_head->oh_len = cpu_to_be32(copy_len); |
1da177e4 LT |
1917 | logop_head->oh_flags |= XLOG_CONTINUE_TRANS; |
1918 | if (partial_copy) | |
1919 | logop_head->oh_flags |= XLOG_WAS_CONT_TRANS; | |
1920 | partial_copy_len += copy_len; | |
1921 | partial_copy++; | |
1922 | len += sizeof(xlog_op_header_t); /* from splitting of region */ | |
1923 | /* account for new log op header */ | |
1924 | ticket->t_curr_res -= sizeof(xlog_op_header_t); | |
0adba536 | 1925 | ticket->t_res_num_ophdrs++; |
1da177e4 LT |
1926 | } |
1927 | xlog_verify_dest_ptr(log, ptr); | |
1928 | ||
1929 | /* copy region */ | |
1930 | ASSERT(copy_len >= 0); | |
1931 | memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len); | |
1932 | xlog_write_adv_cnt(ptr, len, log_offset, copy_len); | |
1933 | ||
1934 | /* make copy_len total bytes copied, including headers */ | |
1935 | copy_len += start_rec_copy + sizeof(xlog_op_header_t); | |
1936 | record_cnt++; | |
1937 | data_cnt += contwr ? copy_len : 0; | |
1938 | if (partial_copy) { /* copied partial region */ | |
1939 | /* already marked WANT_SYNC by xlog_state_get_iclog_space */ | |
1940 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
1941 | record_cnt = data_cnt = 0; | |
1942 | if ((error = xlog_state_release_iclog(log, iclog))) | |
014c2544 | 1943 | return error; |
1da177e4 LT |
1944 | break; /* don't increment index */ |
1945 | } else { /* copied entire region */ | |
1946 | index++; | |
1947 | partial_copy_len = partial_copy = 0; | |
1948 | ||
1949 | if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) { | |
1950 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
1951 | record_cnt = data_cnt = 0; | |
39e2defe | 1952 | spin_lock(&log->l_icloglock); |
1da177e4 | 1953 | xlog_state_want_sync(log, iclog); |
39e2defe | 1954 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
1955 | if (commit_iclog) { |
1956 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
1957 | *commit_iclog = iclog; | |
1958 | } else if ((error = xlog_state_release_iclog(log, iclog))) | |
014c2544 | 1959 | return error; |
1da177e4 LT |
1960 | if (index == nentries) |
1961 | return 0; /* we are done */ | |
1962 | else | |
1963 | break; | |
1964 | } | |
1965 | } /* if (partial_copy) */ | |
1966 | } /* while (index < nentries) */ | |
1967 | } /* for (index = 0; index < nentries; ) */ | |
1968 | ASSERT(len == 0); | |
1969 | ||
1970 | xlog_state_finish_copy(log, iclog, record_cnt, data_cnt); | |
1971 | if (commit_iclog) { | |
1972 | ASSERT(flags & XLOG_COMMIT_TRANS); | |
1973 | *commit_iclog = iclog; | |
1974 | return 0; | |
1975 | } | |
014c2544 | 1976 | return xlog_state_release_iclog(log, iclog); |
1da177e4 LT |
1977 | } /* xlog_write */ |
1978 | ||
1979 | ||
1980 | /***************************************************************************** | |
1981 | * | |
1982 | * State Machine functions | |
1983 | * | |
1984 | ***************************************************************************** | |
1985 | */ | |
1986 | ||
1987 | /* Clean iclogs starting from the head. This ordering must be | |
1988 | * maintained, so an iclog doesn't become ACTIVE beyond one that | |
1989 | * is SYNCING. This is also required to maintain the notion that we use | |
12017faf | 1990 | * a ordered wait queue to hold off would be writers to the log when every |
1da177e4 LT |
1991 | * iclog is trying to sync to disk. |
1992 | * | |
1993 | * State Change: DIRTY -> ACTIVE | |
1994 | */ | |
ba0f32d4 | 1995 | STATIC void |
1da177e4 LT |
1996 | xlog_state_clean_log(xlog_t *log) |
1997 | { | |
1998 | xlog_in_core_t *iclog; | |
1999 | int changed = 0; | |
2000 | ||
2001 | iclog = log->l_iclog; | |
2002 | do { | |
2003 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
2004 | iclog->ic_state = XLOG_STATE_ACTIVE; | |
2005 | iclog->ic_offset = 0; | |
114d23aa | 2006 | ASSERT(iclog->ic_callback == NULL); |
1da177e4 LT |
2007 | /* |
2008 | * If the number of ops in this iclog indicate it just | |
2009 | * contains the dummy transaction, we can | |
2010 | * change state into IDLE (the second time around). | |
2011 | * Otherwise we should change the state into | |
2012 | * NEED a dummy. | |
2013 | * We don't need to cover the dummy. | |
2014 | */ | |
2015 | if (!changed && | |
b53e675d CH |
2016 | (be32_to_cpu(iclog->ic_header.h_num_logops) == |
2017 | XLOG_COVER_OPS)) { | |
1da177e4 LT |
2018 | changed = 1; |
2019 | } else { | |
2020 | /* | |
2021 | * We have two dirty iclogs so start over | |
2022 | * This could also be num of ops indicates | |
2023 | * this is not the dummy going out. | |
2024 | */ | |
2025 | changed = 2; | |
2026 | } | |
2027 | iclog->ic_header.h_num_logops = 0; | |
2028 | memset(iclog->ic_header.h_cycle_data, 0, | |
2029 | sizeof(iclog->ic_header.h_cycle_data)); | |
2030 | iclog->ic_header.h_lsn = 0; | |
2031 | } else if (iclog->ic_state == XLOG_STATE_ACTIVE) | |
2032 | /* do nothing */; | |
2033 | else | |
2034 | break; /* stop cleaning */ | |
2035 | iclog = iclog->ic_next; | |
2036 | } while (iclog != log->l_iclog); | |
2037 | ||
2038 | /* log is locked when we are called */ | |
2039 | /* | |
2040 | * Change state for the dummy log recording. | |
2041 | * We usually go to NEED. But we go to NEED2 if the changed indicates | |
2042 | * we are done writing the dummy record. | |
2043 | * If we are done with the second dummy recored (DONE2), then | |
2044 | * we go to IDLE. | |
2045 | */ | |
2046 | if (changed) { | |
2047 | switch (log->l_covered_state) { | |
2048 | case XLOG_STATE_COVER_IDLE: | |
2049 | case XLOG_STATE_COVER_NEED: | |
2050 | case XLOG_STATE_COVER_NEED2: | |
2051 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2052 | break; | |
2053 | ||
2054 | case XLOG_STATE_COVER_DONE: | |
2055 | if (changed == 1) | |
2056 | log->l_covered_state = XLOG_STATE_COVER_NEED2; | |
2057 | else | |
2058 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2059 | break; | |
2060 | ||
2061 | case XLOG_STATE_COVER_DONE2: | |
2062 | if (changed == 1) | |
2063 | log->l_covered_state = XLOG_STATE_COVER_IDLE; | |
2064 | else | |
2065 | log->l_covered_state = XLOG_STATE_COVER_NEED; | |
2066 | break; | |
2067 | ||
2068 | default: | |
2069 | ASSERT(0); | |
2070 | } | |
2071 | } | |
2072 | } /* xlog_state_clean_log */ | |
2073 | ||
2074 | STATIC xfs_lsn_t | |
2075 | xlog_get_lowest_lsn( | |
2076 | xlog_t *log) | |
2077 | { | |
2078 | xlog_in_core_t *lsn_log; | |
2079 | xfs_lsn_t lowest_lsn, lsn; | |
2080 | ||
2081 | lsn_log = log->l_iclog; | |
2082 | lowest_lsn = 0; | |
2083 | do { | |
2084 | if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) { | |
b53e675d | 2085 | lsn = be64_to_cpu(lsn_log->ic_header.h_lsn); |
1da177e4 LT |
2086 | if ((lsn && !lowest_lsn) || |
2087 | (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) { | |
2088 | lowest_lsn = lsn; | |
2089 | } | |
2090 | } | |
2091 | lsn_log = lsn_log->ic_next; | |
2092 | } while (lsn_log != log->l_iclog); | |
014c2544 | 2093 | return lowest_lsn; |
1da177e4 LT |
2094 | } |
2095 | ||
2096 | ||
2097 | STATIC void | |
2098 | xlog_state_do_callback( | |
2099 | xlog_t *log, | |
2100 | int aborted, | |
2101 | xlog_in_core_t *ciclog) | |
2102 | { | |
2103 | xlog_in_core_t *iclog; | |
2104 | xlog_in_core_t *first_iclog; /* used to know when we've | |
2105 | * processed all iclogs once */ | |
2106 | xfs_log_callback_t *cb, *cb_next; | |
2107 | int flushcnt = 0; | |
2108 | xfs_lsn_t lowest_lsn; | |
2109 | int ioerrors; /* counter: iclogs with errors */ | |
2110 | int loopdidcallbacks; /* flag: inner loop did callbacks*/ | |
2111 | int funcdidcallbacks; /* flag: function did callbacks */ | |
2112 | int repeats; /* for issuing console warnings if | |
2113 | * looping too many times */ | |
d748c623 | 2114 | int wake = 0; |
1da177e4 | 2115 | |
b22cd72c | 2116 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2117 | first_iclog = iclog = log->l_iclog; |
2118 | ioerrors = 0; | |
2119 | funcdidcallbacks = 0; | |
2120 | repeats = 0; | |
2121 | ||
2122 | do { | |
2123 | /* | |
2124 | * Scan all iclogs starting with the one pointed to by the | |
2125 | * log. Reset this starting point each time the log is | |
2126 | * unlocked (during callbacks). | |
2127 | * | |
2128 | * Keep looping through iclogs until one full pass is made | |
2129 | * without running any callbacks. | |
2130 | */ | |
2131 | first_iclog = log->l_iclog; | |
2132 | iclog = log->l_iclog; | |
2133 | loopdidcallbacks = 0; | |
2134 | repeats++; | |
2135 | ||
2136 | do { | |
2137 | ||
2138 | /* skip all iclogs in the ACTIVE & DIRTY states */ | |
2139 | if (iclog->ic_state & | |
2140 | (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) { | |
2141 | iclog = iclog->ic_next; | |
2142 | continue; | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * Between marking a filesystem SHUTDOWN and stopping | |
2147 | * the log, we do flush all iclogs to disk (if there | |
2148 | * wasn't a log I/O error). So, we do want things to | |
2149 | * go smoothly in case of just a SHUTDOWN w/o a | |
2150 | * LOG_IO_ERROR. | |
2151 | */ | |
2152 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) { | |
2153 | /* | |
2154 | * Can only perform callbacks in order. Since | |
2155 | * this iclog is not in the DONE_SYNC/ | |
2156 | * DO_CALLBACK state, we skip the rest and | |
2157 | * just try to clean up. If we set our iclog | |
2158 | * to DO_CALLBACK, we will not process it when | |
2159 | * we retry since a previous iclog is in the | |
2160 | * CALLBACK and the state cannot change since | |
b22cd72c | 2161 | * we are holding the l_icloglock. |
1da177e4 LT |
2162 | */ |
2163 | if (!(iclog->ic_state & | |
2164 | (XLOG_STATE_DONE_SYNC | | |
2165 | XLOG_STATE_DO_CALLBACK))) { | |
2166 | if (ciclog && (ciclog->ic_state == | |
2167 | XLOG_STATE_DONE_SYNC)) { | |
2168 | ciclog->ic_state = XLOG_STATE_DO_CALLBACK; | |
2169 | } | |
2170 | break; | |
2171 | } | |
2172 | /* | |
2173 | * We now have an iclog that is in either the | |
2174 | * DO_CALLBACK or DONE_SYNC states. The other | |
2175 | * states (WANT_SYNC, SYNCING, or CALLBACK were | |
2176 | * caught by the above if and are going to | |
2177 | * clean (i.e. we aren't doing their callbacks) | |
2178 | * see the above if. | |
2179 | */ | |
2180 | ||
2181 | /* | |
2182 | * We will do one more check here to see if we | |
2183 | * have chased our tail around. | |
2184 | */ | |
2185 | ||
2186 | lowest_lsn = xlog_get_lowest_lsn(log); | |
b53e675d CH |
2187 | if (lowest_lsn && |
2188 | XFS_LSN_CMP(lowest_lsn, | |
2189 | be64_to_cpu(iclog->ic_header.h_lsn)) < 0) { | |
1da177e4 LT |
2190 | iclog = iclog->ic_next; |
2191 | continue; /* Leave this iclog for | |
2192 | * another thread */ | |
2193 | } | |
2194 | ||
2195 | iclog->ic_state = XLOG_STATE_CALLBACK; | |
2196 | ||
b22cd72c | 2197 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2198 | |
2199 | /* l_last_sync_lsn field protected by | |
c8b5ea28 | 2200 | * l_grant_lock. Don't worry about iclog's lsn. |
1da177e4 LT |
2201 | * No one else can be here except us. |
2202 | */ | |
c8b5ea28 | 2203 | spin_lock(&log->l_grant_lock); |
b53e675d CH |
2204 | ASSERT(XFS_LSN_CMP(log->l_last_sync_lsn, |
2205 | be64_to_cpu(iclog->ic_header.h_lsn)) <= 0); | |
2206 | log->l_last_sync_lsn = | |
2207 | be64_to_cpu(iclog->ic_header.h_lsn); | |
c8b5ea28 | 2208 | spin_unlock(&log->l_grant_lock); |
1da177e4 | 2209 | |
1da177e4 | 2210 | } else { |
114d23aa | 2211 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2212 | ioerrors++; |
2213 | } | |
1da177e4 | 2214 | |
114d23aa DC |
2215 | /* |
2216 | * Keep processing entries in the callback list until | |
2217 | * we come around and it is empty. We need to | |
2218 | * atomically see that the list is empty and change the | |
2219 | * state to DIRTY so that we don't miss any more | |
2220 | * callbacks being added. | |
2221 | */ | |
2222 | spin_lock(&iclog->ic_callback_lock); | |
2223 | cb = iclog->ic_callback; | |
4b80916b | 2224 | while (cb) { |
1da177e4 LT |
2225 | iclog->ic_callback_tail = &(iclog->ic_callback); |
2226 | iclog->ic_callback = NULL; | |
114d23aa | 2227 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2228 | |
2229 | /* perform callbacks in the order given */ | |
4b80916b | 2230 | for (; cb; cb = cb_next) { |
1da177e4 LT |
2231 | cb_next = cb->cb_next; |
2232 | cb->cb_func(cb->cb_arg, aborted); | |
2233 | } | |
114d23aa | 2234 | spin_lock(&iclog->ic_callback_lock); |
1da177e4 LT |
2235 | cb = iclog->ic_callback; |
2236 | } | |
2237 | ||
2238 | loopdidcallbacks++; | |
2239 | funcdidcallbacks++; | |
2240 | ||
114d23aa | 2241 | spin_lock(&log->l_icloglock); |
4b80916b | 2242 | ASSERT(iclog->ic_callback == NULL); |
114d23aa | 2243 | spin_unlock(&iclog->ic_callback_lock); |
1da177e4 LT |
2244 | if (!(iclog->ic_state & XLOG_STATE_IOERROR)) |
2245 | iclog->ic_state = XLOG_STATE_DIRTY; | |
2246 | ||
2247 | /* | |
2248 | * Transition from DIRTY to ACTIVE if applicable. | |
2249 | * NOP if STATE_IOERROR. | |
2250 | */ | |
2251 | xlog_state_clean_log(log); | |
2252 | ||
2253 | /* wake up threads waiting in xfs_log_force() */ | |
12017faf | 2254 | sv_broadcast(&iclog->ic_force_wait); |
1da177e4 LT |
2255 | |
2256 | iclog = iclog->ic_next; | |
2257 | } while (first_iclog != iclog); | |
a3c6685e NS |
2258 | |
2259 | if (repeats > 5000) { | |
2260 | flushcnt += repeats; | |
2261 | repeats = 0; | |
1da177e4 | 2262 | xfs_fs_cmn_err(CE_WARN, log->l_mp, |
a3c6685e | 2263 | "%s: possible infinite loop (%d iterations)", |
34a622b2 | 2264 | __func__, flushcnt); |
1da177e4 LT |
2265 | } |
2266 | } while (!ioerrors && loopdidcallbacks); | |
2267 | ||
2268 | /* | |
2269 | * make one last gasp attempt to see if iclogs are being left in | |
2270 | * limbo.. | |
2271 | */ | |
2272 | #ifdef DEBUG | |
2273 | if (funcdidcallbacks) { | |
2274 | first_iclog = iclog = log->l_iclog; | |
2275 | do { | |
2276 | ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK); | |
2277 | /* | |
2278 | * Terminate the loop if iclogs are found in states | |
2279 | * which will cause other threads to clean up iclogs. | |
2280 | * | |
2281 | * SYNCING - i/o completion will go through logs | |
2282 | * DONE_SYNC - interrupt thread should be waiting for | |
b22cd72c | 2283 | * l_icloglock |
1da177e4 LT |
2284 | * IOERROR - give up hope all ye who enter here |
2285 | */ | |
2286 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC || | |
2287 | iclog->ic_state == XLOG_STATE_SYNCING || | |
2288 | iclog->ic_state == XLOG_STATE_DONE_SYNC || | |
2289 | iclog->ic_state == XLOG_STATE_IOERROR ) | |
2290 | break; | |
2291 | iclog = iclog->ic_next; | |
2292 | } while (first_iclog != iclog); | |
2293 | } | |
2294 | #endif | |
2295 | ||
d748c623 MW |
2296 | if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) |
2297 | wake = 1; | |
b22cd72c | 2298 | spin_unlock(&log->l_icloglock); |
d748c623 MW |
2299 | |
2300 | if (wake) | |
2301 | sv_broadcast(&log->l_flush_wait); | |
2302 | } | |
1da177e4 LT |
2303 | |
2304 | ||
2305 | /* | |
2306 | * Finish transitioning this iclog to the dirty state. | |
2307 | * | |
2308 | * Make sure that we completely execute this routine only when this is | |
2309 | * the last call to the iclog. There is a good chance that iclog flushes, | |
2310 | * when we reach the end of the physical log, get turned into 2 separate | |
2311 | * calls to bwrite. Hence, one iclog flush could generate two calls to this | |
2312 | * routine. By using the reference count bwritecnt, we guarantee that only | |
2313 | * the second completion goes through. | |
2314 | * | |
2315 | * Callbacks could take time, so they are done outside the scope of the | |
12017faf | 2316 | * global state machine log lock. |
1da177e4 | 2317 | */ |
a8272ce0 | 2318 | STATIC void |
1da177e4 LT |
2319 | xlog_state_done_syncing( |
2320 | xlog_in_core_t *iclog, | |
2321 | int aborted) | |
2322 | { | |
2323 | xlog_t *log = iclog->ic_log; | |
1da177e4 | 2324 | |
b22cd72c | 2325 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2326 | |
2327 | ASSERT(iclog->ic_state == XLOG_STATE_SYNCING || | |
2328 | iclog->ic_state == XLOG_STATE_IOERROR); | |
155cc6b7 | 2329 | ASSERT(atomic_read(&iclog->ic_refcnt) == 0); |
1da177e4 LT |
2330 | ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2); |
2331 | ||
2332 | ||
2333 | /* | |
2334 | * If we got an error, either on the first buffer, or in the case of | |
2335 | * split log writes, on the second, we mark ALL iclogs STATE_IOERROR, | |
2336 | * and none should ever be attempted to be written to disk | |
2337 | * again. | |
2338 | */ | |
2339 | if (iclog->ic_state != XLOG_STATE_IOERROR) { | |
2340 | if (--iclog->ic_bwritecnt == 1) { | |
b22cd72c | 2341 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2342 | return; |
2343 | } | |
2344 | iclog->ic_state = XLOG_STATE_DONE_SYNC; | |
2345 | } | |
2346 | ||
2347 | /* | |
2348 | * Someone could be sleeping prior to writing out the next | |
2349 | * iclog buffer, we wake them all, one will get to do the | |
2350 | * I/O, the others get to wait for the result. | |
2351 | */ | |
12017faf | 2352 | sv_broadcast(&iclog->ic_write_wait); |
b22cd72c | 2353 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2354 | xlog_state_do_callback(log, aborted, iclog); /* also cleans log */ |
2355 | } /* xlog_state_done_syncing */ | |
2356 | ||
2357 | ||
2358 | /* | |
2359 | * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must | |
12017faf DC |
2360 | * sleep. We wait on the flush queue on the head iclog as that should be |
2361 | * the first iclog to complete flushing. Hence if all iclogs are syncing, | |
2362 | * we will wait here and all new writes will sleep until a sync completes. | |
1da177e4 LT |
2363 | * |
2364 | * The in-core logs are used in a circular fashion. They are not used | |
2365 | * out-of-order even when an iclog past the head is free. | |
2366 | * | |
2367 | * return: | |
2368 | * * log_offset where xlog_write() can start writing into the in-core | |
2369 | * log's data space. | |
2370 | * * in-core log pointer to which xlog_write() should write. | |
2371 | * * boolean indicating this is a continued write to an in-core log. | |
2372 | * If this is the last write, then the in-core log's offset field | |
2373 | * needs to be incremented, depending on the amount of data which | |
2374 | * is copied. | |
2375 | */ | |
a8272ce0 | 2376 | STATIC int |
1da177e4 LT |
2377 | xlog_state_get_iclog_space(xlog_t *log, |
2378 | int len, | |
2379 | xlog_in_core_t **iclogp, | |
2380 | xlog_ticket_t *ticket, | |
2381 | int *continued_write, | |
2382 | int *logoffsetp) | |
2383 | { | |
1da177e4 LT |
2384 | int log_offset; |
2385 | xlog_rec_header_t *head; | |
2386 | xlog_in_core_t *iclog; | |
2387 | int error; | |
2388 | ||
2389 | restart: | |
b22cd72c | 2390 | spin_lock(&log->l_icloglock); |
1da177e4 | 2391 | if (XLOG_FORCED_SHUTDOWN(log)) { |
b22cd72c | 2392 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2393 | return XFS_ERROR(EIO); |
2394 | } | |
2395 | ||
2396 | iclog = log->l_iclog; | |
d748c623 | 2397 | if (iclog->ic_state != XLOG_STATE_ACTIVE) { |
1da177e4 LT |
2398 | xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH); |
2399 | XFS_STATS_INC(xs_log_noiclogs); | |
d748c623 MW |
2400 | |
2401 | /* Wait for log writes to have flushed */ | |
2402 | sv_wait(&log->l_flush_wait, 0, &log->l_icloglock, 0); | |
1da177e4 LT |
2403 | goto restart; |
2404 | } | |
d748c623 | 2405 | |
1da177e4 LT |
2406 | head = &iclog->ic_header; |
2407 | ||
155cc6b7 | 2408 | atomic_inc(&iclog->ic_refcnt); /* prevents sync */ |
1da177e4 LT |
2409 | log_offset = iclog->ic_offset; |
2410 | ||
2411 | /* On the 1st write to an iclog, figure out lsn. This works | |
2412 | * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are | |
2413 | * committing to. If the offset is set, that's how many blocks | |
2414 | * must be written. | |
2415 | */ | |
2416 | if (log_offset == 0) { | |
2417 | ticket->t_curr_res -= log->l_iclog_hsize; | |
0adba536 | 2418 | xlog_tic_add_region(ticket, |
7e9c6396 TS |
2419 | log->l_iclog_hsize, |
2420 | XLOG_REG_TYPE_LRHEADER); | |
b53e675d CH |
2421 | head->h_cycle = cpu_to_be32(log->l_curr_cycle); |
2422 | head->h_lsn = cpu_to_be64( | |
03bea6fe | 2423 | xlog_assign_lsn(log->l_curr_cycle, log->l_curr_block)); |
1da177e4 LT |
2424 | ASSERT(log->l_curr_block >= 0); |
2425 | } | |
2426 | ||
2427 | /* If there is enough room to write everything, then do it. Otherwise, | |
2428 | * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC | |
2429 | * bit is on, so this will get flushed out. Don't update ic_offset | |
2430 | * until you know exactly how many bytes get copied. Therefore, wait | |
2431 | * until later to update ic_offset. | |
2432 | * | |
2433 | * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's | |
2434 | * can fit into remaining data section. | |
2435 | */ | |
2436 | if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) { | |
2437 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2438 | ||
49641f1a DC |
2439 | /* |
2440 | * If I'm the only one writing to this iclog, sync it to disk. | |
2441 | * We need to do an atomic compare and decrement here to avoid | |
2442 | * racing with concurrent atomic_dec_and_lock() calls in | |
2443 | * xlog_state_release_iclog() when there is more than one | |
2444 | * reference to the iclog. | |
2445 | */ | |
2446 | if (!atomic_add_unless(&iclog->ic_refcnt, -1, 1)) { | |
2447 | /* we are the only one */ | |
b22cd72c | 2448 | spin_unlock(&log->l_icloglock); |
49641f1a DC |
2449 | error = xlog_state_release_iclog(log, iclog); |
2450 | if (error) | |
014c2544 | 2451 | return error; |
1da177e4 | 2452 | } else { |
b22cd72c | 2453 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2454 | } |
2455 | goto restart; | |
2456 | } | |
2457 | ||
2458 | /* Do we have enough room to write the full amount in the remainder | |
2459 | * of this iclog? Or must we continue a write on the next iclog and | |
2460 | * mark this iclog as completely taken? In the case where we switch | |
2461 | * iclogs (to mark it taken), this particular iclog will release/sync | |
2462 | * to disk in xlog_write(). | |
2463 | */ | |
2464 | if (len <= iclog->ic_size - iclog->ic_offset) { | |
2465 | *continued_write = 0; | |
2466 | iclog->ic_offset += len; | |
2467 | } else { | |
2468 | *continued_write = 1; | |
2469 | xlog_state_switch_iclogs(log, iclog, iclog->ic_size); | |
2470 | } | |
2471 | *iclogp = iclog; | |
2472 | ||
2473 | ASSERT(iclog->ic_offset <= iclog->ic_size); | |
b22cd72c | 2474 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2475 | |
2476 | *logoffsetp = log_offset; | |
2477 | return 0; | |
2478 | } /* xlog_state_get_iclog_space */ | |
2479 | ||
2480 | /* | |
2481 | * Atomically get the log space required for a log ticket. | |
2482 | * | |
2483 | * Once a ticket gets put onto the reserveq, it will only return after | |
2484 | * the needed reservation is satisfied. | |
2485 | */ | |
2486 | STATIC int | |
2487 | xlog_grant_log_space(xlog_t *log, | |
2488 | xlog_ticket_t *tic) | |
2489 | { | |
2490 | int free_bytes; | |
2491 | int need_bytes; | |
1da177e4 LT |
2492 | #ifdef DEBUG |
2493 | xfs_lsn_t tail_lsn; | |
2494 | #endif | |
2495 | ||
2496 | ||
2497 | #ifdef DEBUG | |
2498 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
2499 | panic("grant Recovery problem"); | |
2500 | #endif | |
2501 | ||
2502 | /* Is there space or do we need to sleep? */ | |
c8b5ea28 | 2503 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2504 | xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter"); |
2505 | ||
2506 | /* something is already sleeping; insert new transaction at end */ | |
2507 | if (log->l_reserve_headq) { | |
dd954c69 | 2508 | xlog_ins_ticketq(&log->l_reserve_headq, tic); |
1da177e4 LT |
2509 | xlog_trace_loggrant(log, tic, |
2510 | "xlog_grant_log_space: sleep 1"); | |
2511 | /* | |
2512 | * Gotta check this before going to sleep, while we're | |
2513 | * holding the grant lock. | |
2514 | */ | |
2515 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2516 | goto error_return; | |
2517 | ||
2518 | XFS_STATS_INC(xs_sleep_logspace); | |
12017faf | 2519 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); |
1da177e4 LT |
2520 | /* |
2521 | * If we got an error, and the filesystem is shutting down, | |
2522 | * we'll catch it down below. So just continue... | |
2523 | */ | |
2524 | xlog_trace_loggrant(log, tic, | |
2525 | "xlog_grant_log_space: wake 1"); | |
c8b5ea28 | 2526 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2527 | } |
2528 | if (tic->t_flags & XFS_LOG_PERM_RESERV) | |
2529 | need_bytes = tic->t_unit_res*tic->t_ocnt; | |
2530 | else | |
2531 | need_bytes = tic->t_unit_res; | |
2532 | ||
2533 | redo: | |
2534 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2535 | goto error_return; | |
2536 | ||
2537 | free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle, | |
2538 | log->l_grant_reserve_bytes); | |
2539 | if (free_bytes < need_bytes) { | |
2540 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
dd954c69 | 2541 | xlog_ins_ticketq(&log->l_reserve_headq, tic); |
1da177e4 LT |
2542 | xlog_trace_loggrant(log, tic, |
2543 | "xlog_grant_log_space: sleep 2"); | |
2544 | XFS_STATS_INC(xs_sleep_logspace); | |
12017faf | 2545 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); |
1da177e4 LT |
2546 | |
2547 | if (XLOG_FORCED_SHUTDOWN(log)) { | |
c8b5ea28 | 2548 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2549 | goto error_return; |
2550 | } | |
2551 | ||
2552 | xlog_trace_loggrant(log, tic, | |
2553 | "xlog_grant_log_space: wake 2"); | |
2554 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
c8b5ea28 | 2555 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2556 | goto redo; |
2557 | } else if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2558 | xlog_del_ticketq(&log->l_reserve_headq, tic); |
1da177e4 LT |
2559 | |
2560 | /* we've got enough space */ | |
dd954c69 | 2561 | xlog_grant_add_space(log, need_bytes); |
1da177e4 LT |
2562 | #ifdef DEBUG |
2563 | tail_lsn = log->l_tail_lsn; | |
2564 | /* | |
2565 | * Check to make sure the grant write head didn't just over lap the | |
2566 | * tail. If the cycles are the same, we can't be overlapping. | |
2567 | * Otherwise, make sure that the cycles differ by exactly one and | |
2568 | * check the byte count. | |
2569 | */ | |
2570 | if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { | |
2571 | ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); | |
2572 | ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); | |
2573 | } | |
2574 | #endif | |
2575 | xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit"); | |
2576 | xlog_verify_grant_head(log, 1); | |
c8b5ea28 | 2577 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2578 | return 0; |
2579 | ||
2580 | error_return: | |
2581 | if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2582 | xlog_del_ticketq(&log->l_reserve_headq, tic); |
1da177e4 LT |
2583 | xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret"); |
2584 | /* | |
2585 | * If we are failing, make sure the ticket doesn't have any | |
2586 | * current reservations. We don't want to add this back when | |
2587 | * the ticket/transaction gets cancelled. | |
2588 | */ | |
2589 | tic->t_curr_res = 0; | |
2590 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
c8b5ea28 | 2591 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2592 | return XFS_ERROR(EIO); |
2593 | } /* xlog_grant_log_space */ | |
2594 | ||
2595 | ||
2596 | /* | |
2597 | * Replenish the byte reservation required by moving the grant write head. | |
2598 | * | |
2599 | * | |
2600 | */ | |
2601 | STATIC int | |
2602 | xlog_regrant_write_log_space(xlog_t *log, | |
2603 | xlog_ticket_t *tic) | |
2604 | { | |
1da177e4 LT |
2605 | int free_bytes, need_bytes; |
2606 | xlog_ticket_t *ntic; | |
2607 | #ifdef DEBUG | |
2608 | xfs_lsn_t tail_lsn; | |
2609 | #endif | |
2610 | ||
2611 | tic->t_curr_res = tic->t_unit_res; | |
0adba536 | 2612 | xlog_tic_reset_res(tic); |
1da177e4 LT |
2613 | |
2614 | if (tic->t_cnt > 0) | |
014c2544 | 2615 | return 0; |
1da177e4 LT |
2616 | |
2617 | #ifdef DEBUG | |
2618 | if (log->l_flags & XLOG_ACTIVE_RECOVERY) | |
2619 | panic("regrant Recovery problem"); | |
2620 | #endif | |
2621 | ||
c8b5ea28 | 2622 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2623 | xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter"); |
2624 | ||
2625 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2626 | goto error_return; | |
2627 | ||
2628 | /* If there are other waiters on the queue then give them a | |
2629 | * chance at logspace before us. Wake up the first waiters, | |
2630 | * if we do not wake up all the waiters then go to sleep waiting | |
2631 | * for more free space, otherwise try to get some space for | |
2632 | * this transaction. | |
2633 | */ | |
2634 | ||
2635 | if ((ntic = log->l_write_headq)) { | |
2636 | free_bytes = xlog_space_left(log, log->l_grant_write_cycle, | |
2637 | log->l_grant_write_bytes); | |
2638 | do { | |
2639 | ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV); | |
2640 | ||
2641 | if (free_bytes < ntic->t_unit_res) | |
2642 | break; | |
2643 | free_bytes -= ntic->t_unit_res; | |
12017faf | 2644 | sv_signal(&ntic->t_wait); |
1da177e4 LT |
2645 | ntic = ntic->t_next; |
2646 | } while (ntic != log->l_write_headq); | |
2647 | ||
2648 | if (ntic != log->l_write_headq) { | |
2649 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
dd954c69 | 2650 | xlog_ins_ticketq(&log->l_write_headq, tic); |
1da177e4 LT |
2651 | |
2652 | xlog_trace_loggrant(log, tic, | |
2653 | "xlog_regrant_write_log_space: sleep 1"); | |
2654 | XFS_STATS_INC(xs_sleep_logspace); | |
12017faf | 2655 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, |
1da177e4 LT |
2656 | &log->l_grant_lock, s); |
2657 | ||
2658 | /* If we're shutting down, this tic is already | |
2659 | * off the queue */ | |
2660 | if (XLOG_FORCED_SHUTDOWN(log)) { | |
c8b5ea28 | 2661 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2662 | goto error_return; |
2663 | } | |
2664 | ||
2665 | xlog_trace_loggrant(log, tic, | |
2666 | "xlog_regrant_write_log_space: wake 1"); | |
2667 | xlog_grant_push_ail(log->l_mp, tic->t_unit_res); | |
c8b5ea28 | 2668 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2669 | } |
2670 | } | |
2671 | ||
2672 | need_bytes = tic->t_unit_res; | |
2673 | ||
2674 | redo: | |
2675 | if (XLOG_FORCED_SHUTDOWN(log)) | |
2676 | goto error_return; | |
2677 | ||
2678 | free_bytes = xlog_space_left(log, log->l_grant_write_cycle, | |
2679 | log->l_grant_write_bytes); | |
2680 | if (free_bytes < need_bytes) { | |
2681 | if ((tic->t_flags & XLOG_TIC_IN_Q) == 0) | |
dd954c69 | 2682 | xlog_ins_ticketq(&log->l_write_headq, tic); |
1da177e4 | 2683 | XFS_STATS_INC(xs_sleep_logspace); |
12017faf | 2684 | sv_wait(&tic->t_wait, PINOD|PLTWAIT, &log->l_grant_lock, s); |
1da177e4 LT |
2685 | |
2686 | /* If we're shutting down, this tic is already off the queue */ | |
2687 | if (XLOG_FORCED_SHUTDOWN(log)) { | |
c8b5ea28 | 2688 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2689 | goto error_return; |
2690 | } | |
2691 | ||
2692 | xlog_trace_loggrant(log, tic, | |
2693 | "xlog_regrant_write_log_space: wake 2"); | |
2694 | xlog_grant_push_ail(log->l_mp, need_bytes); | |
c8b5ea28 | 2695 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2696 | goto redo; |
2697 | } else if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2698 | xlog_del_ticketq(&log->l_write_headq, tic); |
1da177e4 | 2699 | |
dd954c69 CH |
2700 | /* we've got enough space */ |
2701 | xlog_grant_add_space_write(log, need_bytes); | |
1da177e4 LT |
2702 | #ifdef DEBUG |
2703 | tail_lsn = log->l_tail_lsn; | |
2704 | if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) { | |
2705 | ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn)); | |
2706 | ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn))); | |
2707 | } | |
2708 | #endif | |
2709 | ||
2710 | xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit"); | |
2711 | xlog_verify_grant_head(log, 1); | |
c8b5ea28 | 2712 | spin_unlock(&log->l_grant_lock); |
014c2544 | 2713 | return 0; |
1da177e4 LT |
2714 | |
2715 | ||
2716 | error_return: | |
2717 | if (tic->t_flags & XLOG_TIC_IN_Q) | |
dd954c69 | 2718 | xlog_del_ticketq(&log->l_reserve_headq, tic); |
1da177e4 LT |
2719 | xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret"); |
2720 | /* | |
2721 | * If we are failing, make sure the ticket doesn't have any | |
2722 | * current reservations. We don't want to add this back when | |
2723 | * the ticket/transaction gets cancelled. | |
2724 | */ | |
2725 | tic->t_curr_res = 0; | |
2726 | tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */ | |
c8b5ea28 | 2727 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2728 | return XFS_ERROR(EIO); |
2729 | } /* xlog_regrant_write_log_space */ | |
2730 | ||
2731 | ||
2732 | /* The first cnt-1 times through here we don't need to | |
2733 | * move the grant write head because the permanent | |
2734 | * reservation has reserved cnt times the unit amount. | |
2735 | * Release part of current permanent unit reservation and | |
2736 | * reset current reservation to be one units worth. Also | |
2737 | * move grant reservation head forward. | |
2738 | */ | |
2739 | STATIC void | |
2740 | xlog_regrant_reserve_log_space(xlog_t *log, | |
2741 | xlog_ticket_t *ticket) | |
2742 | { | |
1da177e4 LT |
2743 | xlog_trace_loggrant(log, ticket, |
2744 | "xlog_regrant_reserve_log_space: enter"); | |
2745 | if (ticket->t_cnt > 0) | |
2746 | ticket->t_cnt--; | |
2747 | ||
c8b5ea28 | 2748 | spin_lock(&log->l_grant_lock); |
dd954c69 | 2749 | xlog_grant_sub_space(log, ticket->t_curr_res); |
1da177e4 | 2750 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2751 | xlog_tic_reset_res(ticket); |
1da177e4 LT |
2752 | xlog_trace_loggrant(log, ticket, |
2753 | "xlog_regrant_reserve_log_space: sub current res"); | |
2754 | xlog_verify_grant_head(log, 1); | |
2755 | ||
2756 | /* just return if we still have some of the pre-reserved space */ | |
2757 | if (ticket->t_cnt > 0) { | |
c8b5ea28 | 2758 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2759 | return; |
2760 | } | |
2761 | ||
dd954c69 | 2762 | xlog_grant_add_space_reserve(log, ticket->t_unit_res); |
1da177e4 LT |
2763 | xlog_trace_loggrant(log, ticket, |
2764 | "xlog_regrant_reserve_log_space: exit"); | |
2765 | xlog_verify_grant_head(log, 0); | |
c8b5ea28 | 2766 | spin_unlock(&log->l_grant_lock); |
1da177e4 | 2767 | ticket->t_curr_res = ticket->t_unit_res; |
0adba536 | 2768 | xlog_tic_reset_res(ticket); |
1da177e4 LT |
2769 | } /* xlog_regrant_reserve_log_space */ |
2770 | ||
2771 | ||
2772 | /* | |
2773 | * Give back the space left from a reservation. | |
2774 | * | |
2775 | * All the information we need to make a correct determination of space left | |
2776 | * is present. For non-permanent reservations, things are quite easy. The | |
2777 | * count should have been decremented to zero. We only need to deal with the | |
2778 | * space remaining in the current reservation part of the ticket. If the | |
2779 | * ticket contains a permanent reservation, there may be left over space which | |
2780 | * needs to be released. A count of N means that N-1 refills of the current | |
2781 | * reservation can be done before we need to ask for more space. The first | |
2782 | * one goes to fill up the first current reservation. Once we run out of | |
2783 | * space, the count will stay at zero and the only space remaining will be | |
2784 | * in the current reservation field. | |
2785 | */ | |
2786 | STATIC void | |
2787 | xlog_ungrant_log_space(xlog_t *log, | |
2788 | xlog_ticket_t *ticket) | |
2789 | { | |
1da177e4 LT |
2790 | if (ticket->t_cnt > 0) |
2791 | ticket->t_cnt--; | |
2792 | ||
c8b5ea28 | 2793 | spin_lock(&log->l_grant_lock); |
1da177e4 LT |
2794 | xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter"); |
2795 | ||
dd954c69 | 2796 | xlog_grant_sub_space(log, ticket->t_curr_res); |
1da177e4 LT |
2797 | |
2798 | xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current"); | |
2799 | ||
2800 | /* If this is a permanent reservation ticket, we may be able to free | |
2801 | * up more space based on the remaining count. | |
2802 | */ | |
2803 | if (ticket->t_cnt > 0) { | |
2804 | ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV); | |
dd954c69 | 2805 | xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt); |
1da177e4 LT |
2806 | } |
2807 | ||
2808 | xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit"); | |
2809 | xlog_verify_grant_head(log, 1); | |
c8b5ea28 | 2810 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
2811 | xfs_log_move_tail(log->l_mp, 1); |
2812 | } /* xlog_ungrant_log_space */ | |
2813 | ||
2814 | ||
1da177e4 LT |
2815 | /* |
2816 | * Flush iclog to disk if this is the last reference to the given iclog and | |
2817 | * the WANT_SYNC bit is set. | |
2818 | * | |
2819 | * When this function is entered, the iclog is not necessarily in the | |
2820 | * WANT_SYNC state. It may be sitting around waiting to get filled. | |
2821 | * | |
2822 | * | |
2823 | */ | |
a8272ce0 | 2824 | STATIC int |
b589334c DC |
2825 | xlog_state_release_iclog( |
2826 | xlog_t *log, | |
2827 | xlog_in_core_t *iclog) | |
1da177e4 | 2828 | { |
1da177e4 LT |
2829 | int sync = 0; /* do we sync? */ |
2830 | ||
155cc6b7 DC |
2831 | if (iclog->ic_state & XLOG_STATE_IOERROR) |
2832 | return XFS_ERROR(EIO); | |
2833 | ||
2834 | ASSERT(atomic_read(&iclog->ic_refcnt) > 0); | |
2835 | if (!atomic_dec_and_lock(&iclog->ic_refcnt, &log->l_icloglock)) | |
2836 | return 0; | |
2837 | ||
1da177e4 | 2838 | if (iclog->ic_state & XLOG_STATE_IOERROR) { |
b22cd72c | 2839 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2840 | return XFS_ERROR(EIO); |
2841 | } | |
1da177e4 LT |
2842 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE || |
2843 | iclog->ic_state == XLOG_STATE_WANT_SYNC); | |
2844 | ||
155cc6b7 | 2845 | if (iclog->ic_state == XLOG_STATE_WANT_SYNC) { |
b589334c DC |
2846 | /* update tail before writing to iclog */ |
2847 | xlog_assign_tail_lsn(log->l_mp); | |
1da177e4 LT |
2848 | sync++; |
2849 | iclog->ic_state = XLOG_STATE_SYNCING; | |
b53e675d | 2850 | iclog->ic_header.h_tail_lsn = cpu_to_be64(log->l_tail_lsn); |
1da177e4 LT |
2851 | xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn); |
2852 | /* cycle incremented when incrementing curr_block */ | |
2853 | } | |
b22cd72c | 2854 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2855 | |
2856 | /* | |
2857 | * We let the log lock go, so it's possible that we hit a log I/O | |
c41564b5 | 2858 | * error or some other SHUTDOWN condition that marks the iclog |
1da177e4 LT |
2859 | * as XLOG_STATE_IOERROR before the bwrite. However, we know that |
2860 | * this iclog has consistent data, so we ignore IOERROR | |
2861 | * flags after this point. | |
2862 | */ | |
b589334c | 2863 | if (sync) |
1da177e4 | 2864 | return xlog_sync(log, iclog); |
014c2544 | 2865 | return 0; |
1da177e4 LT |
2866 | } /* xlog_state_release_iclog */ |
2867 | ||
2868 | ||
2869 | /* | |
2870 | * This routine will mark the current iclog in the ring as WANT_SYNC | |
2871 | * and move the current iclog pointer to the next iclog in the ring. | |
2872 | * When this routine is called from xlog_state_get_iclog_space(), the | |
2873 | * exact size of the iclog has not yet been determined. All we know is | |
2874 | * that every data block. We have run out of space in this log record. | |
2875 | */ | |
2876 | STATIC void | |
2877 | xlog_state_switch_iclogs(xlog_t *log, | |
2878 | xlog_in_core_t *iclog, | |
2879 | int eventual_size) | |
2880 | { | |
2881 | ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE); | |
2882 | if (!eventual_size) | |
2883 | eventual_size = iclog->ic_offset; | |
2884 | iclog->ic_state = XLOG_STATE_WANT_SYNC; | |
b53e675d | 2885 | iclog->ic_header.h_prev_block = cpu_to_be32(log->l_prev_block); |
1da177e4 LT |
2886 | log->l_prev_block = log->l_curr_block; |
2887 | log->l_prev_cycle = log->l_curr_cycle; | |
2888 | ||
2889 | /* roll log?: ic_offset changed later */ | |
2890 | log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize); | |
2891 | ||
2892 | /* Round up to next log-sunit */ | |
62118709 | 2893 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
1da177e4 LT |
2894 | log->l_mp->m_sb.sb_logsunit > 1) { |
2895 | __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit); | |
2896 | log->l_curr_block = roundup(log->l_curr_block, sunit_bb); | |
2897 | } | |
2898 | ||
2899 | if (log->l_curr_block >= log->l_logBBsize) { | |
2900 | log->l_curr_cycle++; | |
2901 | if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM) | |
2902 | log->l_curr_cycle++; | |
2903 | log->l_curr_block -= log->l_logBBsize; | |
2904 | ASSERT(log->l_curr_block >= 0); | |
2905 | } | |
2906 | ASSERT(iclog == log->l_iclog); | |
2907 | log->l_iclog = iclog->ic_next; | |
2908 | } /* xlog_state_switch_iclogs */ | |
2909 | ||
2910 | ||
2911 | /* | |
2912 | * Write out all data in the in-core log as of this exact moment in time. | |
2913 | * | |
2914 | * Data may be written to the in-core log during this call. However, | |
2915 | * we don't guarantee this data will be written out. A change from past | |
2916 | * implementation means this routine will *not* write out zero length LRs. | |
2917 | * | |
2918 | * Basically, we try and perform an intelligent scan of the in-core logs. | |
2919 | * If we determine there is no flushable data, we just return. There is no | |
2920 | * flushable data if: | |
2921 | * | |
2922 | * 1. the current iclog is active and has no data; the previous iclog | |
2923 | * is in the active or dirty state. | |
2924 | * 2. the current iclog is drity, and the previous iclog is in the | |
2925 | * active or dirty state. | |
2926 | * | |
12017faf | 2927 | * We may sleep if: |
1da177e4 LT |
2928 | * |
2929 | * 1. the current iclog is not in the active nor dirty state. | |
2930 | * 2. the current iclog dirty, and the previous iclog is not in the | |
2931 | * active nor dirty state. | |
2932 | * 3. the current iclog is active, and there is another thread writing | |
2933 | * to this particular iclog. | |
2934 | * 4. a) the current iclog is active and has no other writers | |
2935 | * b) when we return from flushing out this iclog, it is still | |
2936 | * not in the active nor dirty state. | |
2937 | */ | |
2938 | STATIC int | |
f538d4da | 2939 | xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed) |
1da177e4 LT |
2940 | { |
2941 | xlog_in_core_t *iclog; | |
2942 | xfs_lsn_t lsn; | |
1da177e4 | 2943 | |
b22cd72c | 2944 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
2945 | |
2946 | iclog = log->l_iclog; | |
2947 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 2948 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2949 | return XFS_ERROR(EIO); |
2950 | } | |
2951 | ||
2952 | /* If the head iclog is not active nor dirty, we just attach | |
2953 | * ourselves to the head and go to sleep. | |
2954 | */ | |
2955 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2956 | iclog->ic_state == XLOG_STATE_DIRTY) { | |
2957 | /* | |
2958 | * If the head is dirty or (active and empty), then | |
2959 | * we need to look at the previous iclog. If the previous | |
2960 | * iclog is active or dirty we are done. There is nothing | |
2961 | * to sync out. Otherwise, we attach ourselves to the | |
2962 | * previous iclog and go to sleep. | |
2963 | */ | |
2964 | if (iclog->ic_state == XLOG_STATE_DIRTY || | |
155cc6b7 DC |
2965 | (atomic_read(&iclog->ic_refcnt) == 0 |
2966 | && iclog->ic_offset == 0)) { | |
1da177e4 LT |
2967 | iclog = iclog->ic_prev; |
2968 | if (iclog->ic_state == XLOG_STATE_ACTIVE || | |
2969 | iclog->ic_state == XLOG_STATE_DIRTY) | |
2970 | goto no_sleep; | |
2971 | else | |
2972 | goto maybe_sleep; | |
2973 | } else { | |
155cc6b7 | 2974 | if (atomic_read(&iclog->ic_refcnt) == 0) { |
1da177e4 LT |
2975 | /* We are the only one with access to this |
2976 | * iclog. Flush it out now. There should | |
2977 | * be a roundoff of zero to show that someone | |
2978 | * has already taken care of the roundoff from | |
2979 | * the previous sync. | |
2980 | */ | |
155cc6b7 | 2981 | atomic_inc(&iclog->ic_refcnt); |
b53e675d | 2982 | lsn = be64_to_cpu(iclog->ic_header.h_lsn); |
1da177e4 | 2983 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 2984 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
2985 | |
2986 | if (xlog_state_release_iclog(log, iclog)) | |
2987 | return XFS_ERROR(EIO); | |
f538d4da | 2988 | *log_flushed = 1; |
b22cd72c | 2989 | spin_lock(&log->l_icloglock); |
b53e675d | 2990 | if (be64_to_cpu(iclog->ic_header.h_lsn) == lsn && |
1da177e4 LT |
2991 | iclog->ic_state != XLOG_STATE_DIRTY) |
2992 | goto maybe_sleep; | |
2993 | else | |
2994 | goto no_sleep; | |
2995 | } else { | |
2996 | /* Someone else is writing to this iclog. | |
2997 | * Use its call to flush out the data. However, | |
2998 | * the other thread may not force out this LR, | |
2999 | * so we mark it WANT_SYNC. | |
3000 | */ | |
3001 | xlog_state_switch_iclogs(log, iclog, 0); | |
3002 | goto maybe_sleep; | |
3003 | } | |
3004 | } | |
3005 | } | |
3006 | ||
3007 | /* By the time we come around again, the iclog could've been filled | |
3008 | * which would give it another lsn. If we have a new lsn, just | |
3009 | * return because the relevant data has been flushed. | |
3010 | */ | |
3011 | maybe_sleep: | |
3012 | if (flags & XFS_LOG_SYNC) { | |
3013 | /* | |
3014 | * We must check if we're shutting down here, before | |
b22cd72c | 3015 | * we wait, while we're holding the l_icloglock. |
1da177e4 LT |
3016 | * Then we check again after waking up, in case our |
3017 | * sleep was disturbed by a bad news. | |
3018 | */ | |
3019 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3020 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3021 | return XFS_ERROR(EIO); |
3022 | } | |
3023 | XFS_STATS_INC(xs_log_force_sleep); | |
12017faf | 3024 | sv_wait(&iclog->ic_force_wait, PINOD, &log->l_icloglock, s); |
1da177e4 LT |
3025 | /* |
3026 | * No need to grab the log lock here since we're | |
3027 | * only deciding whether or not to return EIO | |
3028 | * and the memory read should be atomic. | |
3029 | */ | |
3030 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3031 | return XFS_ERROR(EIO); | |
f538d4da | 3032 | *log_flushed = 1; |
1da177e4 LT |
3033 | |
3034 | } else { | |
3035 | ||
3036 | no_sleep: | |
b22cd72c | 3037 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3038 | } |
3039 | return 0; | |
3040 | } /* xlog_state_sync_all */ | |
3041 | ||
3042 | ||
3043 | /* | |
3044 | * Used by code which implements synchronous log forces. | |
3045 | * | |
3046 | * Find in-core log with lsn. | |
3047 | * If it is in the DIRTY state, just return. | |
3048 | * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC | |
3049 | * state and go to sleep or return. | |
3050 | * If it is in any other state, go to sleep or return. | |
3051 | * | |
3052 | * If filesystem activity goes to zero, the iclog will get flushed only by | |
3053 | * bdflush(). | |
3054 | */ | |
a8272ce0 | 3055 | STATIC int |
1da177e4 LT |
3056 | xlog_state_sync(xlog_t *log, |
3057 | xfs_lsn_t lsn, | |
f538d4da CH |
3058 | uint flags, |
3059 | int *log_flushed) | |
1da177e4 LT |
3060 | { |
3061 | xlog_in_core_t *iclog; | |
3062 | int already_slept = 0; | |
1da177e4 LT |
3063 | |
3064 | try_again: | |
b22cd72c | 3065 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3066 | iclog = log->l_iclog; |
3067 | ||
3068 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3069 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3070 | return XFS_ERROR(EIO); |
3071 | } | |
3072 | ||
3073 | do { | |
b53e675d CH |
3074 | if (be64_to_cpu(iclog->ic_header.h_lsn) != lsn) { |
3075 | iclog = iclog->ic_next; | |
3076 | continue; | |
1da177e4 LT |
3077 | } |
3078 | ||
3079 | if (iclog->ic_state == XLOG_STATE_DIRTY) { | |
b22cd72c | 3080 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3081 | return 0; |
3082 | } | |
3083 | ||
3084 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3085 | /* | |
3086 | * We sleep here if we haven't already slept (e.g. | |
3087 | * this is the first time we've looked at the correct | |
3088 | * iclog buf) and the buffer before us is going to | |
3089 | * be sync'ed. The reason for this is that if we | |
3090 | * are doing sync transactions here, by waiting for | |
3091 | * the previous I/O to complete, we can allow a few | |
3092 | * more transactions into this iclog before we close | |
3093 | * it down. | |
3094 | * | |
3095 | * Otherwise, we mark the buffer WANT_SYNC, and bump | |
3096 | * up the refcnt so we can release the log (which drops | |
3097 | * the ref count). The state switch keeps new transaction | |
3098 | * commits from using this buffer. When the current commits | |
3099 | * finish writing into the buffer, the refcount will drop to | |
3100 | * zero and the buffer will go out then. | |
3101 | */ | |
3102 | if (!already_slept && | |
3103 | (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC | | |
3104 | XLOG_STATE_SYNCING))) { | |
3105 | ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR)); | |
3106 | XFS_STATS_INC(xs_log_force_sleep); | |
12017faf | 3107 | sv_wait(&iclog->ic_prev->ic_write_wait, PSWP, |
1da177e4 | 3108 | &log->l_icloglock, s); |
f538d4da | 3109 | *log_flushed = 1; |
1da177e4 LT |
3110 | already_slept = 1; |
3111 | goto try_again; | |
3112 | } else { | |
155cc6b7 | 3113 | atomic_inc(&iclog->ic_refcnt); |
1da177e4 | 3114 | xlog_state_switch_iclogs(log, iclog, 0); |
b22cd72c | 3115 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3116 | if (xlog_state_release_iclog(log, iclog)) |
3117 | return XFS_ERROR(EIO); | |
f538d4da | 3118 | *log_flushed = 1; |
b22cd72c | 3119 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3120 | } |
3121 | } | |
3122 | ||
3123 | if ((flags & XFS_LOG_SYNC) && /* sleep */ | |
3124 | !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) { | |
3125 | ||
3126 | /* | |
12017faf | 3127 | * Don't wait on completion if we know that we've |
1da177e4 LT |
3128 | * gotten a log write error. |
3129 | */ | |
3130 | if (iclog->ic_state & XLOG_STATE_IOERROR) { | |
b22cd72c | 3131 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3132 | return XFS_ERROR(EIO); |
3133 | } | |
3134 | XFS_STATS_INC(xs_log_force_sleep); | |
12017faf | 3135 | sv_wait(&iclog->ic_force_wait, PSWP, &log->l_icloglock, s); |
1da177e4 LT |
3136 | /* |
3137 | * No need to grab the log lock here since we're | |
3138 | * only deciding whether or not to return EIO | |
3139 | * and the memory read should be atomic. | |
3140 | */ | |
3141 | if (iclog->ic_state & XLOG_STATE_IOERROR) | |
3142 | return XFS_ERROR(EIO); | |
f538d4da | 3143 | *log_flushed = 1; |
1da177e4 | 3144 | } else { /* just return */ |
b22cd72c | 3145 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3146 | } |
3147 | return 0; | |
3148 | ||
3149 | } while (iclog != log->l_iclog); | |
3150 | ||
b22cd72c | 3151 | spin_unlock(&log->l_icloglock); |
014c2544 | 3152 | return 0; |
1da177e4 LT |
3153 | } /* xlog_state_sync */ |
3154 | ||
3155 | ||
3156 | /* | |
3157 | * Called when we want to mark the current iclog as being ready to sync to | |
3158 | * disk. | |
3159 | */ | |
a8272ce0 | 3160 | STATIC void |
1da177e4 LT |
3161 | xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog) |
3162 | { | |
39e2defe | 3163 | ASSERT(spin_is_locked(&log->l_icloglock)); |
1da177e4 LT |
3164 | |
3165 | if (iclog->ic_state == XLOG_STATE_ACTIVE) { | |
3166 | xlog_state_switch_iclogs(log, iclog, 0); | |
3167 | } else { | |
3168 | ASSERT(iclog->ic_state & | |
3169 | (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR)); | |
3170 | } | |
39e2defe | 3171 | } |
1da177e4 LT |
3172 | |
3173 | ||
3174 | /***************************************************************************** | |
3175 | * | |
3176 | * TICKET functions | |
3177 | * | |
3178 | ***************************************************************************** | |
3179 | */ | |
3180 | ||
3181 | /* | |
cc09c0dc | 3182 | * Free a used ticket when it's refcount falls to zero. |
1da177e4 | 3183 | */ |
cc09c0dc DC |
3184 | void |
3185 | xfs_log_ticket_put( | |
3186 | xlog_ticket_t *ticket) | |
1da177e4 | 3187 | { |
cc09c0dc DC |
3188 | ASSERT(atomic_read(&ticket->t_ref) > 0); |
3189 | if (atomic_dec_and_test(&ticket->t_ref)) { | |
3190 | sv_destroy(&ticket->t_wait); | |
3191 | kmem_zone_free(xfs_log_ticket_zone, ticket); | |
3192 | } | |
3193 | } | |
1da177e4 | 3194 | |
cc09c0dc DC |
3195 | xlog_ticket_t * |
3196 | xfs_log_ticket_get( | |
3197 | xlog_ticket_t *ticket) | |
3198 | { | |
3199 | ASSERT(atomic_read(&ticket->t_ref) > 0); | |
3200 | atomic_inc(&ticket->t_ref); | |
3201 | return ticket; | |
3202 | } | |
1da177e4 LT |
3203 | |
3204 | /* | |
eb01c9cd | 3205 | * Allocate and initialise a new log ticket. |
1da177e4 | 3206 | */ |
a8272ce0 | 3207 | STATIC xlog_ticket_t * |
cc09c0dc | 3208 | xlog_ticket_alloc(xlog_t *log, |
1da177e4 LT |
3209 | int unit_bytes, |
3210 | int cnt, | |
3211 | char client, | |
3212 | uint xflags) | |
3213 | { | |
3214 | xlog_ticket_t *tic; | |
3215 | uint num_headers; | |
1da177e4 | 3216 | |
eb01c9cd DC |
3217 | tic = kmem_zone_zalloc(xfs_log_ticket_zone, KM_SLEEP|KM_MAYFAIL); |
3218 | if (!tic) | |
3219 | return NULL; | |
1da177e4 LT |
3220 | |
3221 | /* | |
3222 | * Permanent reservations have up to 'cnt'-1 active log operations | |
3223 | * in the log. A unit in this case is the amount of space for one | |
3224 | * of these log operations. Normal reservations have a cnt of 1 | |
3225 | * and their unit amount is the total amount of space required. | |
3226 | * | |
3227 | * The following lines of code account for non-transaction data | |
32fb9b57 TS |
3228 | * which occupy space in the on-disk log. |
3229 | * | |
3230 | * Normal form of a transaction is: | |
3231 | * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph> | |
3232 | * and then there are LR hdrs, split-recs and roundoff at end of syncs. | |
3233 | * | |
3234 | * We need to account for all the leadup data and trailer data | |
3235 | * around the transaction data. | |
3236 | * And then we need to account for the worst case in terms of using | |
3237 | * more space. | |
3238 | * The worst case will happen if: | |
3239 | * - the placement of the transaction happens to be such that the | |
3240 | * roundoff is at its maximum | |
3241 | * - the transaction data is synced before the commit record is synced | |
3242 | * i.e. <transaction-data><roundoff> | <commit-rec><roundoff> | |
3243 | * Therefore the commit record is in its own Log Record. | |
3244 | * This can happen as the commit record is called with its | |
3245 | * own region to xlog_write(). | |
3246 | * This then means that in the worst case, roundoff can happen for | |
3247 | * the commit-rec as well. | |
3248 | * The commit-rec is smaller than padding in this scenario and so it is | |
3249 | * not added separately. | |
1da177e4 LT |
3250 | */ |
3251 | ||
32fb9b57 TS |
3252 | /* for trans header */ |
3253 | unit_bytes += sizeof(xlog_op_header_t); | |
3254 | unit_bytes += sizeof(xfs_trans_header_t); | |
3255 | ||
1da177e4 | 3256 | /* for start-rec */ |
32fb9b57 TS |
3257 | unit_bytes += sizeof(xlog_op_header_t); |
3258 | ||
3259 | /* for LR headers */ | |
3260 | num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log); | |
3261 | unit_bytes += log->l_iclog_hsize * num_headers; | |
1da177e4 | 3262 | |
32fb9b57 TS |
3263 | /* for commit-rec LR header - note: padding will subsume the ophdr */ |
3264 | unit_bytes += log->l_iclog_hsize; | |
3265 | ||
3266 | /* for split-recs - ophdrs added when data split over LRs */ | |
3267 | unit_bytes += sizeof(xlog_op_header_t) * num_headers; | |
3268 | ||
3269 | /* for roundoff padding for transaction data and one for commit record */ | |
62118709 | 3270 | if (xfs_sb_version_haslogv2(&log->l_mp->m_sb) && |
32fb9b57 | 3271 | log->l_mp->m_sb.sb_logsunit > 1) { |
1da177e4 | 3272 | /* log su roundoff */ |
32fb9b57 | 3273 | unit_bytes += 2*log->l_mp->m_sb.sb_logsunit; |
1da177e4 LT |
3274 | } else { |
3275 | /* BB roundoff */ | |
32fb9b57 | 3276 | unit_bytes += 2*BBSIZE; |
1da177e4 LT |
3277 | } |
3278 | ||
cc09c0dc | 3279 | atomic_set(&tic->t_ref, 1); |
1da177e4 LT |
3280 | tic->t_unit_res = unit_bytes; |
3281 | tic->t_curr_res = unit_bytes; | |
3282 | tic->t_cnt = cnt; | |
3283 | tic->t_ocnt = cnt; | |
3284 | tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff); | |
3285 | tic->t_clientid = client; | |
3286 | tic->t_flags = XLOG_TIC_INITED; | |
7e9c6396 | 3287 | tic->t_trans_type = 0; |
1da177e4 LT |
3288 | if (xflags & XFS_LOG_PERM_RESERV) |
3289 | tic->t_flags |= XLOG_TIC_PERM_RESERV; | |
12017faf | 3290 | sv_init(&(tic->t_wait), SV_DEFAULT, "logtick"); |
1da177e4 | 3291 | |
0adba536 | 3292 | xlog_tic_reset_res(tic); |
7e9c6396 | 3293 | |
1da177e4 | 3294 | return tic; |
cc09c0dc | 3295 | } |
1da177e4 LT |
3296 | |
3297 | ||
3298 | /****************************************************************************** | |
3299 | * | |
3300 | * Log debug routines | |
3301 | * | |
3302 | ****************************************************************************** | |
3303 | */ | |
cfcbbbd0 | 3304 | #if defined(DEBUG) |
1da177e4 LT |
3305 | /* |
3306 | * Make sure that the destination ptr is within the valid data region of | |
3307 | * one of the iclogs. This uses backup pointers stored in a different | |
3308 | * part of the log in case we trash the log structure. | |
3309 | */ | |
3310 | void | |
3311 | xlog_verify_dest_ptr(xlog_t *log, | |
3312 | __psint_t ptr) | |
3313 | { | |
3314 | int i; | |
3315 | int good_ptr = 0; | |
3316 | ||
3317 | for (i=0; i < log->l_iclog_bufs; i++) { | |
3318 | if (ptr >= (__psint_t)log->l_iclog_bak[i] && | |
3319 | ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size) | |
3320 | good_ptr++; | |
3321 | } | |
3322 | if (! good_ptr) | |
3323 | xlog_panic("xlog_verify_dest_ptr: invalid ptr"); | |
3324 | } /* xlog_verify_dest_ptr */ | |
3325 | ||
3326 | STATIC void | |
3327 | xlog_verify_grant_head(xlog_t *log, int equals) | |
3328 | { | |
3329 | if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) { | |
3330 | if (equals) | |
3331 | ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes); | |
3332 | else | |
3333 | ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes); | |
3334 | } else { | |
3335 | ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle); | |
3336 | ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes); | |
3337 | } | |
3338 | } /* xlog_verify_grant_head */ | |
3339 | ||
3340 | /* check if it will fit */ | |
3341 | STATIC void | |
3342 | xlog_verify_tail_lsn(xlog_t *log, | |
3343 | xlog_in_core_t *iclog, | |
3344 | xfs_lsn_t tail_lsn) | |
3345 | { | |
3346 | int blocks; | |
3347 | ||
3348 | if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) { | |
3349 | blocks = | |
3350 | log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn)); | |
3351 | if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize)) | |
3352 | xlog_panic("xlog_verify_tail_lsn: ran out of log space"); | |
3353 | } else { | |
3354 | ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle); | |
3355 | ||
3356 | if (BLOCK_LSN(tail_lsn) == log->l_prev_block) | |
3357 | xlog_panic("xlog_verify_tail_lsn: tail wrapped"); | |
3358 | ||
3359 | blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block; | |
3360 | if (blocks < BTOBB(iclog->ic_offset) + 1) | |
3361 | xlog_panic("xlog_verify_tail_lsn: ran out of log space"); | |
3362 | } | |
3363 | } /* xlog_verify_tail_lsn */ | |
3364 | ||
3365 | /* | |
3366 | * Perform a number of checks on the iclog before writing to disk. | |
3367 | * | |
3368 | * 1. Make sure the iclogs are still circular | |
3369 | * 2. Make sure we have a good magic number | |
3370 | * 3. Make sure we don't have magic numbers in the data | |
3371 | * 4. Check fields of each log operation header for: | |
3372 | * A. Valid client identifier | |
3373 | * B. tid ptr value falls in valid ptr space (user space code) | |
3374 | * C. Length in log record header is correct according to the | |
3375 | * individual operation headers within record. | |
3376 | * 5. When a bwrite will occur within 5 blocks of the front of the physical | |
3377 | * log, check the preceding blocks of the physical log to make sure all | |
3378 | * the cycle numbers agree with the current cycle number. | |
3379 | */ | |
3380 | STATIC void | |
3381 | xlog_verify_iclog(xlog_t *log, | |
3382 | xlog_in_core_t *iclog, | |
3383 | int count, | |
3384 | boolean_t syncing) | |
3385 | { | |
3386 | xlog_op_header_t *ophead; | |
3387 | xlog_in_core_t *icptr; | |
3388 | xlog_in_core_2_t *xhdr; | |
3389 | xfs_caddr_t ptr; | |
3390 | xfs_caddr_t base_ptr; | |
3391 | __psint_t field_offset; | |
3392 | __uint8_t clientid; | |
3393 | int len, i, j, k, op_len; | |
3394 | int idx; | |
1da177e4 LT |
3395 | |
3396 | /* check validity of iclog pointers */ | |
b22cd72c | 3397 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3398 | icptr = log->l_iclog; |
3399 | for (i=0; i < log->l_iclog_bufs; i++) { | |
4b80916b | 3400 | if (icptr == NULL) |
1da177e4 LT |
3401 | xlog_panic("xlog_verify_iclog: invalid ptr"); |
3402 | icptr = icptr->ic_next; | |
3403 | } | |
3404 | if (icptr != log->l_iclog) | |
3405 | xlog_panic("xlog_verify_iclog: corrupt iclog ring"); | |
b22cd72c | 3406 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3407 | |
3408 | /* check log magic numbers */ | |
b53e675d | 3409 | if (be32_to_cpu(iclog->ic_header.h_magicno) != XLOG_HEADER_MAGIC_NUM) |
1da177e4 LT |
3410 | xlog_panic("xlog_verify_iclog: invalid magic num"); |
3411 | ||
b53e675d CH |
3412 | ptr = (xfs_caddr_t) &iclog->ic_header; |
3413 | for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&iclog->ic_header) + count; | |
1da177e4 | 3414 | ptr += BBSIZE) { |
b53e675d | 3415 | if (be32_to_cpu(*(__be32 *)ptr) == XLOG_HEADER_MAGIC_NUM) |
1da177e4 LT |
3416 | xlog_panic("xlog_verify_iclog: unexpected magic num"); |
3417 | } | |
3418 | ||
3419 | /* check fields */ | |
b53e675d | 3420 | len = be32_to_cpu(iclog->ic_header.h_num_logops); |
1da177e4 LT |
3421 | ptr = iclog->ic_datap; |
3422 | base_ptr = ptr; | |
3423 | ophead = (xlog_op_header_t *)ptr; | |
b28708d6 | 3424 | xhdr = iclog->ic_data; |
1da177e4 LT |
3425 | for (i = 0; i < len; i++) { |
3426 | ophead = (xlog_op_header_t *)ptr; | |
3427 | ||
3428 | /* clientid is only 1 byte */ | |
3429 | field_offset = (__psint_t) | |
3430 | ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr); | |
3431 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
3432 | clientid = ophead->oh_clientid; | |
3433 | } else { | |
3434 | idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap); | |
3435 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3436 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3437 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
03bea6fe CH |
3438 | clientid = xlog_get_client_id( |
3439 | xhdr[j].hic_xheader.xh_cycle_data[k]); | |
1da177e4 | 3440 | } else { |
03bea6fe CH |
3441 | clientid = xlog_get_client_id( |
3442 | iclog->ic_header.h_cycle_data[idx]); | |
1da177e4 LT |
3443 | } |
3444 | } | |
3445 | if (clientid != XFS_TRANSACTION && clientid != XFS_LOG) | |
da1650a5 CH |
3446 | cmn_err(CE_WARN, "xlog_verify_iclog: " |
3447 | "invalid clientid %d op 0x%p offset 0x%lx", | |
3448 | clientid, ophead, (unsigned long)field_offset); | |
1da177e4 LT |
3449 | |
3450 | /* check length */ | |
3451 | field_offset = (__psint_t) | |
3452 | ((xfs_caddr_t)&(ophead->oh_len) - base_ptr); | |
3453 | if (syncing == B_FALSE || (field_offset & 0x1ff)) { | |
67fcb7bf | 3454 | op_len = be32_to_cpu(ophead->oh_len); |
1da177e4 LT |
3455 | } else { |
3456 | idx = BTOBBT((__psint_t)&ophead->oh_len - | |
3457 | (__psint_t)iclog->ic_datap); | |
3458 | if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) { | |
3459 | j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
3460 | k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE); | |
b53e675d | 3461 | op_len = be32_to_cpu(xhdr[j].hic_xheader.xh_cycle_data[k]); |
1da177e4 | 3462 | } else { |
b53e675d | 3463 | op_len = be32_to_cpu(iclog->ic_header.h_cycle_data[idx]); |
1da177e4 LT |
3464 | } |
3465 | } | |
3466 | ptr += sizeof(xlog_op_header_t) + op_len; | |
3467 | } | |
3468 | } /* xlog_verify_iclog */ | |
cfcbbbd0 | 3469 | #endif |
1da177e4 LT |
3470 | |
3471 | /* | |
b22cd72c | 3472 | * Mark all iclogs IOERROR. l_icloglock is held by the caller. |
1da177e4 LT |
3473 | */ |
3474 | STATIC int | |
3475 | xlog_state_ioerror( | |
3476 | xlog_t *log) | |
3477 | { | |
3478 | xlog_in_core_t *iclog, *ic; | |
3479 | ||
3480 | iclog = log->l_iclog; | |
3481 | if (! (iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3482 | /* | |
3483 | * Mark all the incore logs IOERROR. | |
3484 | * From now on, no log flushes will result. | |
3485 | */ | |
3486 | ic = iclog; | |
3487 | do { | |
3488 | ic->ic_state = XLOG_STATE_IOERROR; | |
3489 | ic = ic->ic_next; | |
3490 | } while (ic != iclog); | |
014c2544 | 3491 | return 0; |
1da177e4 LT |
3492 | } |
3493 | /* | |
3494 | * Return non-zero, if state transition has already happened. | |
3495 | */ | |
014c2544 | 3496 | return 1; |
1da177e4 LT |
3497 | } |
3498 | ||
3499 | /* | |
3500 | * This is called from xfs_force_shutdown, when we're forcibly | |
3501 | * shutting down the filesystem, typically because of an IO error. | |
3502 | * Our main objectives here are to make sure that: | |
3503 | * a. the filesystem gets marked 'SHUTDOWN' for all interested | |
3504 | * parties to find out, 'atomically'. | |
3505 | * b. those who're sleeping on log reservations, pinned objects and | |
3506 | * other resources get woken up, and be told the bad news. | |
3507 | * c. nothing new gets queued up after (a) and (b) are done. | |
3508 | * d. if !logerror, flush the iclogs to disk, then seal them off | |
3509 | * for business. | |
3510 | */ | |
3511 | int | |
3512 | xfs_log_force_umount( | |
3513 | struct xfs_mount *mp, | |
3514 | int logerror) | |
3515 | { | |
3516 | xlog_ticket_t *tic; | |
3517 | xlog_t *log; | |
3518 | int retval; | |
f538d4da | 3519 | int dummy; |
1da177e4 LT |
3520 | |
3521 | log = mp->m_log; | |
3522 | ||
3523 | /* | |
3524 | * If this happens during log recovery, don't worry about | |
3525 | * locking; the log isn't open for business yet. | |
3526 | */ | |
3527 | if (!log || | |
3528 | log->l_flags & XLOG_ACTIVE_RECOVERY) { | |
3529 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; | |
bac8dca9 CH |
3530 | if (mp->m_sb_bp) |
3531 | XFS_BUF_DONE(mp->m_sb_bp); | |
014c2544 | 3532 | return 0; |
1da177e4 LT |
3533 | } |
3534 | ||
3535 | /* | |
3536 | * Somebody could've already done the hard work for us. | |
3537 | * No need to get locks for this. | |
3538 | */ | |
3539 | if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) { | |
3540 | ASSERT(XLOG_FORCED_SHUTDOWN(log)); | |
014c2544 | 3541 | return 1; |
1da177e4 LT |
3542 | } |
3543 | retval = 0; | |
3544 | /* | |
3545 | * We must hold both the GRANT lock and the LOG lock, | |
3546 | * before we mark the filesystem SHUTDOWN and wake | |
3547 | * everybody up to tell the bad news. | |
3548 | */ | |
b22cd72c | 3549 | spin_lock(&log->l_icloglock); |
6b1d1a73 | 3550 | spin_lock(&log->l_grant_lock); |
1da177e4 | 3551 | mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN; |
bac8dca9 CH |
3552 | if (mp->m_sb_bp) |
3553 | XFS_BUF_DONE(mp->m_sb_bp); | |
3554 | ||
1da177e4 LT |
3555 | /* |
3556 | * This flag is sort of redundant because of the mount flag, but | |
3557 | * it's good to maintain the separation between the log and the rest | |
3558 | * of XFS. | |
3559 | */ | |
3560 | log->l_flags |= XLOG_IO_ERROR; | |
3561 | ||
3562 | /* | |
3563 | * If we hit a log error, we want to mark all the iclogs IOERROR | |
3564 | * while we're still holding the loglock. | |
3565 | */ | |
3566 | if (logerror) | |
3567 | retval = xlog_state_ioerror(log); | |
b22cd72c | 3568 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3569 | |
3570 | /* | |
3571 | * We don't want anybody waiting for log reservations | |
3572 | * after this. That means we have to wake up everybody | |
3573 | * queued up on reserve_headq as well as write_headq. | |
3574 | * In addition, we make sure in xlog_{re}grant_log_space | |
3575 | * that we don't enqueue anything once the SHUTDOWN flag | |
3576 | * is set, and this action is protected by the GRANTLOCK. | |
3577 | */ | |
3578 | if ((tic = log->l_reserve_headq)) { | |
3579 | do { | |
12017faf | 3580 | sv_signal(&tic->t_wait); |
1da177e4 LT |
3581 | tic = tic->t_next; |
3582 | } while (tic != log->l_reserve_headq); | |
3583 | } | |
3584 | ||
3585 | if ((tic = log->l_write_headq)) { | |
3586 | do { | |
12017faf | 3587 | sv_signal(&tic->t_wait); |
1da177e4 LT |
3588 | tic = tic->t_next; |
3589 | } while (tic != log->l_write_headq); | |
3590 | } | |
c8b5ea28 | 3591 | spin_unlock(&log->l_grant_lock); |
1da177e4 LT |
3592 | |
3593 | if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) { | |
3594 | ASSERT(!logerror); | |
3595 | /* | |
3596 | * Force the incore logs to disk before shutting the | |
3597 | * log down completely. | |
3598 | */ | |
f538d4da | 3599 | xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy); |
b22cd72c | 3600 | spin_lock(&log->l_icloglock); |
1da177e4 | 3601 | retval = xlog_state_ioerror(log); |
b22cd72c | 3602 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3603 | } |
3604 | /* | |
3605 | * Wake up everybody waiting on xfs_log_force. | |
3606 | * Callback all log item committed functions as if the | |
3607 | * log writes were completed. | |
3608 | */ | |
3609 | xlog_state_do_callback(log, XFS_LI_ABORTED, NULL); | |
3610 | ||
3611 | #ifdef XFSERRORDEBUG | |
3612 | { | |
3613 | xlog_in_core_t *iclog; | |
3614 | ||
b22cd72c | 3615 | spin_lock(&log->l_icloglock); |
1da177e4 LT |
3616 | iclog = log->l_iclog; |
3617 | do { | |
3618 | ASSERT(iclog->ic_callback == 0); | |
3619 | iclog = iclog->ic_next; | |
3620 | } while (iclog != log->l_iclog); | |
b22cd72c | 3621 | spin_unlock(&log->l_icloglock); |
1da177e4 LT |
3622 | } |
3623 | #endif | |
3624 | /* return non-zero if log IOERROR transition had already happened */ | |
014c2544 | 3625 | return retval; |
1da177e4 LT |
3626 | } |
3627 | ||
ba0f32d4 | 3628 | STATIC int |
1da177e4 LT |
3629 | xlog_iclogs_empty(xlog_t *log) |
3630 | { | |
3631 | xlog_in_core_t *iclog; | |
3632 | ||
3633 | iclog = log->l_iclog; | |
3634 | do { | |
3635 | /* endianness does not matter here, zero is zero in | |
3636 | * any language. | |
3637 | */ | |
3638 | if (iclog->ic_header.h_num_logops) | |
014c2544 | 3639 | return 0; |
1da177e4 LT |
3640 | iclog = iclog->ic_next; |
3641 | } while (iclog != log->l_iclog); | |
014c2544 | 3642 | return 1; |
1da177e4 | 3643 | } |