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[XFS] Set filestreams object timeout to something sane.
[linux-2.6-block.git] / fs / xfs / xfs_log.c
CommitLineData
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
LT		 43
44
45#define xlog_write_adv_cnt(ptr, len, off, bytes) \
46 { (ptr) += (bytes); \
47 (len) -= (bytes); \
48 (off) += (bytes);}
49
50/* Local miscellaneous function prototypes */
51STATIC int xlog_bdstrat_cb(struct xfs_buf *);
52STATIC int xlog_commit_record(xfs_mount_t *mp, xlog_ticket_t *ticket,
53 xlog_in_core_t **, xfs_lsn_t *);
54STATIC xlog_t * xlog_alloc_log(xfs_mount_t *mp,
55 xfs_buftarg_t *log_target,
56 xfs_daddr_t blk_offset,
57 int num_bblks);
58STATIC int xlog_space_left(xlog_t *log, int cycle, int bytes);
59STATIC int xlog_sync(xlog_t *log, xlog_in_core_t *iclog);
c41564b5 60STATIC void xlog_dealloc_log(xlog_t *log);
1da177e4
LT		 61STATIC int xlog_write(xfs_mount_t *mp, xfs_log_iovec_t region[],
62 int nentries, xfs_log_ticket_t tic,
63 xfs_lsn_t *start_lsn,
64 xlog_in_core_t **commit_iclog,
65 uint flags);
66
67/* local state machine functions */
68STATIC void xlog_state_done_syncing(xlog_in_core_t *iclog, int);
69STATIC void xlog_state_do_callback(xlog_t *log,int aborted, xlog_in_core_t *iclog);
70STATIC int xlog_state_get_iclog_space(xlog_t *log,
71 int len,
72 xlog_in_core_t **iclog,
73 xlog_ticket_t *ticket,
74 int *continued_write,
75 int *logoffsetp);
76STATIC void xlog_state_put_ticket(xlog_t *log,
77 xlog_ticket_t *tic);
78STATIC int xlog_state_release_iclog(xlog_t *log,
79 xlog_in_core_t *iclog);
80STATIC void xlog_state_switch_iclogs(xlog_t *log,
81 xlog_in_core_t *iclog,
82 int eventual_size);
f538d4da
CH		 83STATIC int xlog_state_sync(xlog_t *log,
84 xfs_lsn_t lsn,
85 uint flags,
86 int *log_flushed);
87STATIC int xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed);
1da177e4
LT		 88STATIC void xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog);
89
90/* local functions to manipulate grant head */
91STATIC int xlog_grant_log_space(xlog_t *log,
92 xlog_ticket_t *xtic);
93STATIC void xlog_grant_push_ail(xfs_mount_t *mp,
94 int need_bytes);
95STATIC void xlog_regrant_reserve_log_space(xlog_t *log,
96 xlog_ticket_t *ticket);
97STATIC int xlog_regrant_write_log_space(xlog_t *log,
98 xlog_ticket_t *ticket);
99STATIC void xlog_ungrant_log_space(xlog_t *log,
100 xlog_ticket_t *ticket);
101
102
103/* local ticket functions */
104STATIC void xlog_state_ticket_alloc(xlog_t *log);
105STATIC xlog_ticket_t *xlog_ticket_get(xlog_t *log,
106 int unit_bytes,
107 int count,
108 char clientid,
109 uint flags);
110STATIC void xlog_ticket_put(xlog_t *log, xlog_ticket_t *ticket);
111
cfcbbbd0 112#if defined(DEBUG)
1da177e4
LT		 113STATIC void xlog_verify_dest_ptr(xlog_t *log, __psint_t ptr);
114STATIC void xlog_verify_grant_head(xlog_t *log, int equals);
115STATIC void xlog_verify_iclog(xlog_t *log, xlog_in_core_t *iclog,
116 int count, boolean_t syncing);
117STATIC void xlog_verify_tail_lsn(xlog_t *log, xlog_in_core_t *iclog,
118 xfs_lsn_t tail_lsn);
119#else
120#define xlog_verify_dest_ptr(a,b)
121#define xlog_verify_grant_head(a,b)
122#define xlog_verify_iclog(a,b,c,d)
123#define xlog_verify_tail_lsn(a,b,c)
124#endif
125
ba0f32d4 126STATIC int xlog_iclogs_empty(xlog_t *log);
1da177e4 127
1da177e4 128#if defined(XFS_LOG_TRACE)
1da177e4
LT		 129void
130xlog_trace_loggrant(xlog_t *log, xlog_ticket_t *tic, xfs_caddr_t string)
131{
7e9c6396
TS		 132 unsigned long cnts;
133
134 if (!log->l_grant_trace) {
135 log->l_grant_trace = ktrace_alloc(2048, KM_NOSLEEP);
136 if (!log->l_grant_trace)
1da177e4
LT		 137 return;
138 }
7e9c6396
TS		 139 /* ticket counts are 1 byte each */
140 cnts = ((unsigned long)tic->t_ocnt) | ((unsigned long)tic->t_cnt) << 8;
1da177e4
LT		 141
142 ktrace_enter(log->l_grant_trace,
143 (void *)tic,
144 (void *)log->l_reserve_headq,
145 (void *)log->l_write_headq,
146 (void *)((unsigned long)log->l_grant_reserve_cycle),
147 (void *)((unsigned long)log->l_grant_reserve_bytes),
148 (void *)((unsigned long)log->l_grant_write_cycle),
149 (void *)((unsigned long)log->l_grant_write_bytes),
150 (void *)((unsigned long)log->l_curr_cycle),
151 (void *)((unsigned long)log->l_curr_block),
152 (void *)((unsigned long)CYCLE_LSN(log->l_tail_lsn)),
153 (void *)((unsigned long)BLOCK_LSN(log->l_tail_lsn)),
154 (void *)string,
7e9c6396
TS		 155 (void *)((unsigned long)tic->t_trans_type),
156 (void *)cnts,
157 (void *)((unsigned long)tic->t_curr_res),
158 (void *)((unsigned long)tic->t_unit_res));
1da177e4
LT		 159}
160
161void
162xlog_trace_iclog(xlog_in_core_t *iclog, uint state)
163{
1da177e4
LT		 164 if (!iclog->ic_trace)
165 iclog->ic_trace = ktrace_alloc(256, KM_SLEEP);
166 ktrace_enter(iclog->ic_trace,
167 (void *)((unsigned long)state),
cfcbbbd0
NS		 168 (void *)((unsigned long)current_pid()),
169 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL,
170 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL,
171 (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL,
172 (void *)NULL, (void *)NULL);
1da177e4 173}
1da177e4
LT		 174#else
175#define xlog_trace_loggrant(log,tic,string)
176#define xlog_trace_iclog(iclog,state)
177#endif /* XFS_LOG_TRACE */
178
dd954c69
CH		 179
180static void
181xlog_ins_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic)
182{
183 if (*qp) {
184 tic->t_next = (*qp);
185 tic->t_prev = (*qp)->t_prev;
186 (*qp)->t_prev->t_next = tic;
187 (*qp)->t_prev = tic;
188 } else {
189 tic->t_prev = tic->t_next = tic;
190 *qp = tic;
191 }
192
193 tic->t_flags |= XLOG_TIC_IN_Q;
194}
195
196static void
197xlog_del_ticketq(struct xlog_ticket **qp, struct xlog_ticket *tic)
198{
199 if (tic == tic->t_next) {
200 *qp = NULL;
201 } else {
202 *qp = tic->t_next;
203 tic->t_next->t_prev = tic->t_prev;
204 tic->t_prev->t_next = tic->t_next;
205 }
206
207 tic->t_next = tic->t_prev = NULL;
208 tic->t_flags &= ~XLOG_TIC_IN_Q;
209}
210
211static void
212xlog_grant_sub_space(struct log *log, int bytes)
213{
214 log->l_grant_write_bytes -= bytes;
215 if (log->l_grant_write_bytes < 0) {
216 log->l_grant_write_bytes += log->l_logsize;
217 log->l_grant_write_cycle--;
218 }
219
220 log->l_grant_reserve_bytes -= bytes;
221 if ((log)->l_grant_reserve_bytes < 0) {
222 log->l_grant_reserve_bytes += log->l_logsize;
223 log->l_grant_reserve_cycle--;
224 }
225
226}
227
228static void
229xlog_grant_add_space_write(struct log *log, int bytes)
230{
231 log->l_grant_write_bytes += bytes;
232 if (log->l_grant_write_bytes > log->l_logsize) {
233 log->l_grant_write_bytes -= log->l_logsize;
234 log->l_grant_write_cycle++;
235 }
236}
237
238static void
239xlog_grant_add_space_reserve(struct log *log, int bytes)
240{
241 log->l_grant_reserve_bytes += bytes;
242 if (log->l_grant_reserve_bytes > log->l_logsize) {
243 log->l_grant_reserve_bytes -= log->l_logsize;
244 log->l_grant_reserve_cycle++;
245 }
246}
247
248static inline void
249xlog_grant_add_space(struct log *log, int bytes)
250{
251 xlog_grant_add_space_write(log, bytes);
252 xlog_grant_add_space_reserve(log, bytes);
253}
254
255
1da177e4
LT		 256/*
257 * NOTES:
258 *
259 * 1. currblock field gets updated at startup and after in-core logs
260 * marked as with WANT_SYNC.
261 */
262
263/*
264 * This routine is called when a user of a log manager ticket is done with
265 * the reservation. If the ticket was ever used, then a commit record for
266 * the associated transaction is written out as a log operation header with
267 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with
268 * a given ticket. If the ticket was one with a permanent reservation, then
269 * a few operations are done differently. Permanent reservation tickets by
270 * default don't release the reservation. They just commit the current
271 * transaction with the belief that the reservation is still needed. A flag
272 * must be passed in before permanent reservations are actually released.
273 * When these type of tickets are not released, they need to be set into
274 * the inited state again. By doing this, a start record will be written
275 * out when the next write occurs.
276 */
277xfs_lsn_t
278xfs_log_done(xfs_mount_t *mp,
279 xfs_log_ticket_t xtic,
280 void **iclog,
281 uint flags)
282{
283 xlog_t *log = mp->m_log;
284 xlog_ticket_t *ticket = (xfs_log_ticket_t) xtic;
285 xfs_lsn_t lsn = 0;
286
1da177e4
LT		 287 if (XLOG_FORCED_SHUTDOWN(log) ||
288 /*
289 * If nothing was ever written, don't write out commit record.
290 * If we get an error, just continue and give back the log ticket.
291 */
292 (((ticket->t_flags & XLOG_TIC_INITED) == 0) &&
293 (xlog_commit_record(mp, ticket,
294 (xlog_in_core_t **)iclog, &lsn)))) {
295 lsn = (xfs_lsn_t) -1;
296 if (ticket->t_flags & XLOG_TIC_PERM_RESERV) {
297 flags |= XFS_LOG_REL_PERM_RESERV;
298 }
299 }
300
301
302 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) == 0 ||
303 (flags & XFS_LOG_REL_PERM_RESERV)) {
304 /*
c41564b5 305 * Release ticket if not permanent reservation or a specific
1da177e4
LT		 306 * request has been made to release a permanent reservation.
307 */
7e9c6396 308 xlog_trace_loggrant(log, ticket, "xfs_log_done: (non-permanent)");
1da177e4
LT		 309 xlog_ungrant_log_space(log, ticket);
310 xlog_state_put_ticket(log, ticket);
311 } else {
7e9c6396 312 xlog_trace_loggrant(log, ticket, "xfs_log_done: (permanent)");
1da177e4
LT		 313 xlog_regrant_reserve_log_space(log, ticket);
314 }
315
316 /* If this ticket was a permanent reservation and we aren't
317 * trying to release it, reset the inited flags; so next time
318 * we write, a start record will be written out.
319 */
320 if ((ticket->t_flags & XLOG_TIC_PERM_RESERV) &&
321 (flags & XFS_LOG_REL_PERM_RESERV) == 0)
322 ticket->t_flags |= XLOG_TIC_INITED;
323
324 return lsn;
325} /* xfs_log_done */
326
327
328/*
329 * Force the in-core log to disk. If flags == XFS_LOG_SYNC,
330 * the force is done synchronously.
331 *
332 * Asynchronous forces are implemented by setting the WANT_SYNC
333 * bit in the appropriate in-core log and then returning.
334 *
335 * Synchronous forces are implemented with a semaphore. All callers
336 * to force a given lsn to disk will wait on a semaphore attached to the
337 * specific in-core log. When given in-core log finally completes its
338 * write to disk, that thread will wake up all threads waiting on the
339 * semaphore.
340 */
341int
f538d4da
CH		 342_xfs_log_force(
343 xfs_mount_t *mp,
344 xfs_lsn_t lsn,
345 uint flags,
346 int *log_flushed)
1da177e4 347{
f538d4da
CH		 348 xlog_t *log = mp->m_log;
349 int dummy;
350
351 if (!log_flushed)
352 log_flushed = &dummy;
1da177e4 353
1da177e4
LT		 354 ASSERT(flags & XFS_LOG_FORCE);
355
356 XFS_STATS_INC(xs_log_force);
357
f538d4da
CH		 358 if (log->l_flags & XLOG_IO_ERROR)
359 return XFS_ERROR(EIO);
360 if (lsn == 0)
361 return xlog_state_sync_all(log, flags, log_flushed);
362 else
363 return xlog_state_sync(log, lsn, flags, log_flushed);
1da177e4
LT		 364} /* xfs_log_force */
365
366/*
367 * Attaches a new iclog I/O completion callback routine during
368 * transaction commit. If the log is in error state, a non-zero
369 * return code is handed back and the caller is responsible for
370 * executing the callback at an appropriate time.
371 */
372int
373xfs_log_notify(xfs_mount_t *mp, /* mount of partition */
374 void *iclog_hndl, /* iclog to hang callback off */
375 xfs_log_callback_t *cb)
376{
377 xlog_t *log = mp->m_log;
378 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl;
379 int abortflg, spl;
380
1da177e4
LT		 381 cb->cb_next = NULL;
382 spl = LOG_LOCK(log);
383 abortflg = (iclog->ic_state & XLOG_STATE_IOERROR);
384 if (!abortflg) {
385 ASSERT_ALWAYS((iclog->ic_state == XLOG_STATE_ACTIVE) ||
386 (iclog->ic_state == XLOG_STATE_WANT_SYNC));
387 cb->cb_next = NULL;
388 *(iclog->ic_callback_tail) = cb;
389 iclog->ic_callback_tail = &(cb->cb_next);
390 }
391 LOG_UNLOCK(log, spl);
392 return abortflg;
393} /* xfs_log_notify */
394
395int
396xfs_log_release_iclog(xfs_mount_t *mp,
397 void *iclog_hndl)
398{
399 xlog_t *log = mp->m_log;
400 xlog_in_core_t *iclog = (xlog_in_core_t *)iclog_hndl;
401
402 if (xlog_state_release_iclog(log, iclog)) {
7d04a335 403 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
014c2544 404 return EIO;
1da177e4
LT		 405 }
406
407 return 0;
408}
409
410/*
411 * 1. Reserve an amount of on-disk log space and return a ticket corresponding
412 * to the reservation.
413 * 2. Potentially, push buffers at tail of log to disk.
414 *
415 * Each reservation is going to reserve extra space for a log record header.
416 * When writes happen to the on-disk log, we don't subtract the length of the
417 * log record header from any reservation. By wasting space in each
418 * reservation, we prevent over allocation problems.
419 */
420int
421xfs_log_reserve(xfs_mount_t *mp,
422 int unit_bytes,
423 int cnt,
424 xfs_log_ticket_t *ticket,
425 __uint8_t client,
7e9c6396
TS		 426 uint flags,
427 uint t_type)
1da177e4
LT		 428{
429 xlog_t *log = mp->m_log;
430 xlog_ticket_t *internal_ticket;
cfcbbbd0 431 int retval = 0;
1da177e4 432
1da177e4
LT		 433 ASSERT(client == XFS_TRANSACTION || client == XFS_LOG);
434 ASSERT((flags & XFS_LOG_NOSLEEP) == 0);
435
436 if (XLOG_FORCED_SHUTDOWN(log))
437 return XFS_ERROR(EIO);
438
439 XFS_STATS_INC(xs_try_logspace);
440
441 if (*ticket != NULL) {
442 ASSERT(flags & XFS_LOG_PERM_RESERV);
443 internal_ticket = (xlog_ticket_t *)*ticket;
7e9c6396 444 xlog_trace_loggrant(log, internal_ticket, "xfs_log_reserve: existing ticket (permanent trans)");
1da177e4
LT		 445 xlog_grant_push_ail(mp, internal_ticket->t_unit_res);
446 retval = xlog_regrant_write_log_space(log, internal_ticket);
447 } else {
448 /* may sleep if need to allocate more tickets */
449 internal_ticket = xlog_ticket_get(log, unit_bytes, cnt,
450 client, flags);
7e9c6396 451 internal_ticket->t_trans_type = t_type;
1da177e4 452 *ticket = internal_ticket;
7e9c6396
TS		 453 xlog_trace_loggrant(log, internal_ticket,
454 (internal_ticket->t_flags & XLOG_TIC_PERM_RESERV) ?
455 "xfs_log_reserve: create new ticket (permanent trans)" :
456 "xfs_log_reserve: create new ticket");
1da177e4
LT		 457 xlog_grant_push_ail(mp,
458 (internal_ticket->t_unit_res *
459 internal_ticket->t_cnt));
460 retval = xlog_grant_log_space(log, internal_ticket);
461 }
462
463 return retval;
464} /* xfs_log_reserve */
465
466
467/*
468 * Mount a log filesystem
469 *
470 * mp - ubiquitous xfs mount point structure
471 * log_target - buftarg of on-disk log device
472 * blk_offset - Start block # where block size is 512 bytes (BBSIZE)
473 * num_bblocks - Number of BBSIZE blocks in on-disk log
474 *
475 * Return error or zero.
476 */
477int
478xfs_log_mount(xfs_mount_t *mp,
479 xfs_buftarg_t *log_target,
480 xfs_daddr_t blk_offset,
481 int num_bblks)
482{
483 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
484 cmn_err(CE_NOTE, "XFS mounting filesystem %s", mp->m_fsname);
485 else {
486 cmn_err(CE_NOTE,
487 "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.",
488 mp->m_fsname);
489 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY);
490 }
491
492 mp->m_log = xlog_alloc_log(mp, log_target, blk_offset, num_bblks);
493
1da177e4
LT		 494 /*
495 * skip log recovery on a norecovery mount. pretend it all
496 * just worked.
497 */
498 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY)) {
b83bd138
NS		 499 bhv_vfs_t *vfsp = XFS_MTOVFS(mp);
500 int error, readonly = (vfsp->vfs_flag & VFS_RDONLY);
1da177e4
LT		 501
502 if (readonly)
503 vfsp->vfs_flag &= ~VFS_RDONLY;
504
65be6054 505 error = xlog_recover(mp->m_log);
1da177e4
LT		 506
507 if (readonly)
508 vfsp->vfs_flag |= VFS_RDONLY;
509 if (error) {
510 cmn_err(CE_WARN, "XFS: log mount/recovery failed: error %d", error);
c41564b5 511 xlog_dealloc_log(mp->m_log);
1da177e4
LT		 512 return error;
513 }
514 }
515
516 /* Normal transactions can now occur */
517 mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY;
518
519 /* End mounting message in xfs_log_mount_finish */
520 return 0;
521} /* xfs_log_mount */
522
523/*
524 * Finish the recovery of the file system. This is separate from
525 * the xfs_log_mount() call, because it depends on the code in
526 * xfs_mountfs() to read in the root and real-time bitmap inodes
527 * between calling xfs_log_mount() and here.
528 *
529 * mp - ubiquitous xfs mount point structure
530 */
531int
532xfs_log_mount_finish(xfs_mount_t *mp, int mfsi_flags)
533{
534 int error;
535
536 if (!(mp->m_flags & XFS_MOUNT_NORECOVERY))
537 error = xlog_recover_finish(mp->m_log, mfsi_flags);
538 else {
539 error = 0;
540 ASSERT(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY);
541 }
542
543 return error;
544}
545
546/*
547 * Unmount processing for the log.
548 */
549int
550xfs_log_unmount(xfs_mount_t *mp)
551{
552 int error;
553
554 error = xfs_log_unmount_write(mp);
555 xfs_log_unmount_dealloc(mp);
014c2544 556 return error;
1da177e4
LT		 557}
558
559/*
560 * Final log writes as part of unmount.
561 *
562 * Mark the filesystem clean as unmount happens. Note that during relocation
563 * this routine needs to be executed as part of source-bag while the
564 * deallocation must not be done until source-end.
565 */
566
567/*
568 * Unmount record used to have a string "Unmount filesystem--" in the
569 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE).
570 * We just write the magic number now since that particular field isn't
571 * currently architecture converted and "nUmount" is a bit foo.
572 * As far as I know, there weren't any dependencies on the old behaviour.
573 */
574
575int
576xfs_log_unmount_write(xfs_mount_t *mp)
577{
578 xlog_t *log = mp->m_log;
579 xlog_in_core_t *iclog;
580#ifdef DEBUG
581 xlog_in_core_t *first_iclog;
582#endif
583 xfs_log_iovec_t reg[1];
584 xfs_log_ticket_t tic = NULL;
585 xfs_lsn_t lsn;
586 int error;
587 SPLDECL(s);
588
589 /* the data section must be 32 bit size aligned */
590 struct {
591 __uint16_t magic;
592 __uint16_t pad1;
593 __uint32_t pad2; /* may as well make it 64 bits */
594 } magic = { XLOG_UNMOUNT_TYPE, 0, 0 };
595
1da177e4
LT		 596 /*
597 * Don't write out unmount record on read-only mounts.
598 * Or, if we are doing a forced umount (typically because of IO errors).
599 */
600 if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
601 return 0;
602
603 xfs_log_force(mp, 0, XFS_LOG_FORCE|XFS_LOG_SYNC);
604
605#ifdef DEBUG
606 first_iclog = iclog = log->l_iclog;
607 do {
608 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
609 ASSERT(iclog->ic_state & XLOG_STATE_ACTIVE);
610 ASSERT(iclog->ic_offset == 0);
611 }
612 iclog = iclog->ic_next;
613 } while (iclog != first_iclog);
614#endif
615 if (! (XLOG_FORCED_SHUTDOWN(log))) {
616 reg[0].i_addr = (void*)&magic;
617 reg[0].i_len = sizeof(magic);
7e9c6396 618 XLOG_VEC_SET_TYPE(&reg[0], XLOG_REG_TYPE_UNMOUNT);
1da177e4 619
955e47ad
TS		 620 error = xfs_log_reserve(mp, 600, 1, &tic,
621 XFS_LOG, 0, XLOG_UNMOUNT_REC_TYPE);
1da177e4
LT		 622 if (!error) {
623 /* remove inited flag */
624 ((xlog_ticket_t *)tic)->t_flags = 0;
625 error = xlog_write(mp, reg, 1, tic, &lsn,
626 NULL, XLOG_UNMOUNT_TRANS);
627 /*
628 * At this point, we're umounting anyway,
629 * so there's no point in transitioning log state
630 * to IOERROR. Just continue...
631 */
632 }
633
634 if (error) {
635 xfs_fs_cmn_err(CE_ALERT, mp,
636 "xfs_log_unmount: unmount record failed");
637 }
638
639
640 s = LOG_LOCK(log);
641 iclog = log->l_iclog;
642 iclog->ic_refcnt++;
643 LOG_UNLOCK(log, s);
644 xlog_state_want_sync(log, iclog);
645 (void) xlog_state_release_iclog(log, iclog);
646
647 s = LOG_LOCK(log);
648 if (!(iclog->ic_state == XLOG_STATE_ACTIVE ||
649 iclog->ic_state == XLOG_STATE_DIRTY)) {
650 if (!XLOG_FORCED_SHUTDOWN(log)) {
651 sv_wait(&iclog->ic_forcesema, PMEM,
652 &log->l_icloglock, s);
653 } else {
654 LOG_UNLOCK(log, s);
655 }
656 } else {
657 LOG_UNLOCK(log, s);
658 }
955e47ad
TS		 659 if (tic) {
660 xlog_trace_loggrant(log, tic, "unmount rec");
661 xlog_ungrant_log_space(log, tic);
1da177e4 662 xlog_state_put_ticket(log, tic);
955e47ad 663 }
1da177e4
LT		 664 } else {
665 /*
666 * We're already in forced_shutdown mode, couldn't
667 * even attempt to write out the unmount transaction.
668 *
669 * Go through the motions of sync'ing and releasing
670 * the iclog, even though no I/O will actually happen,
c41564b5 671 * we need to wait for other log I/Os that may already
1da177e4
LT		 672 * be in progress. Do this as a separate section of
673 * code so we'll know if we ever get stuck here that
674 * we're in this odd situation of trying to unmount
675 * a file system that went into forced_shutdown as
676 * the result of an unmount..
677 */
678 s = LOG_LOCK(log);
679 iclog = log->l_iclog;
680 iclog->ic_refcnt++;
681 LOG_UNLOCK(log, s);
682
683 xlog_state_want_sync(log, iclog);
684 (void) xlog_state_release_iclog(log, iclog);
685
686 s = LOG_LOCK(log);
687
688 if ( ! ( iclog->ic_state == XLOG_STATE_ACTIVE
689 || iclog->ic_state == XLOG_STATE_DIRTY
690 || iclog->ic_state == XLOG_STATE_IOERROR) ) {
691
692 sv_wait(&iclog->ic_forcesema, PMEM,
693 &log->l_icloglock, s);
694 } else {
695 LOG_UNLOCK(log, s);
696 }
697 }
698
699 return 0;
700} /* xfs_log_unmount_write */
701
702/*
703 * Deallocate log structures for unmount/relocation.
704 */
705void
706xfs_log_unmount_dealloc(xfs_mount_t *mp)
707{
c41564b5 708 xlog_dealloc_log(mp->m_log);
1da177e4
LT		 709}
710
711/*
712 * Write region vectors to log. The write happens using the space reservation
713 * of the ticket (tic). It is not a requirement that all writes for a given
714 * transaction occur with one call to xfs_log_write().
715 */
716int
717xfs_log_write(xfs_mount_t * mp,
718 xfs_log_iovec_t reg[],
719 int nentries,
720 xfs_log_ticket_t tic,
721 xfs_lsn_t *start_lsn)
722{
723 int error;
724 xlog_t *log = mp->m_log;
725
1da177e4
LT		 726 if (XLOG_FORCED_SHUTDOWN(log))
727 return XFS_ERROR(EIO);
728
729 if ((error = xlog_write(mp, reg, nentries, tic, start_lsn, NULL, 0))) {
7d04a335 730 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
1da177e4 731 }
014c2544 732 return error;
1da177e4
LT		 733} /* xfs_log_write */
734
735
736void
737xfs_log_move_tail(xfs_mount_t *mp,
738 xfs_lsn_t tail_lsn)
739{
740 xlog_ticket_t *tic;
741 xlog_t *log = mp->m_log;
742 int need_bytes, free_bytes, cycle, bytes;
743 SPLDECL(s);
744
1da177e4
LT		 745 if (XLOG_FORCED_SHUTDOWN(log))
746 return;
747 ASSERT(!XFS_FORCED_SHUTDOWN(mp));
748
749 if (tail_lsn == 0) {
750 /* needed since sync_lsn is 64 bits */
751 s = LOG_LOCK(log);
752 tail_lsn = log->l_last_sync_lsn;
753 LOG_UNLOCK(log, s);
754 }
755
756 s = GRANT_LOCK(log);
757
758 /* Also an invalid lsn. 1 implies that we aren't passing in a valid
759 * tail_lsn.
760 */
761 if (tail_lsn != 1) {
762 log->l_tail_lsn = tail_lsn;
763 }
764
765 if ((tic = log->l_write_headq)) {
766#ifdef DEBUG
767 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
768 panic("Recovery problem");
769#endif
770 cycle = log->l_grant_write_cycle;
771 bytes = log->l_grant_write_bytes;
772 free_bytes = xlog_space_left(log, cycle, bytes);
773 do {
774 ASSERT(tic->t_flags & XLOG_TIC_PERM_RESERV);
775
776 if (free_bytes < tic->t_unit_res && tail_lsn != 1)
777 break;
778 tail_lsn = 0;
779 free_bytes -= tic->t_unit_res;
780 sv_signal(&tic->t_sema);
781 tic = tic->t_next;
782 } while (tic != log->l_write_headq);
783 }
784 if ((tic = log->l_reserve_headq)) {
785#ifdef DEBUG
786 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
787 panic("Recovery problem");
788#endif
789 cycle = log->l_grant_reserve_cycle;
790 bytes = log->l_grant_reserve_bytes;
791 free_bytes = xlog_space_left(log, cycle, bytes);
792 do {
793 if (tic->t_flags & XLOG_TIC_PERM_RESERV)
794 need_bytes = tic->t_unit_res*tic->t_cnt;
795 else
796 need_bytes = tic->t_unit_res;
797 if (free_bytes < need_bytes && tail_lsn != 1)
798 break;
799 tail_lsn = 0;
800 free_bytes -= need_bytes;
801 sv_signal(&tic->t_sema);
802 tic = tic->t_next;
803 } while (tic != log->l_reserve_headq);
804 }
805 GRANT_UNLOCK(log, s);
806} /* xfs_log_move_tail */
807
808/*
809 * Determine if we have a transaction that has gone to disk
810 * that needs to be covered. Log activity needs to be idle (no AIL and
811 * nothing in the iclogs). And, we need to be in the right state indicating
812 * something has gone out.
813 */
814int
815xfs_log_need_covered(xfs_mount_t *mp)
816{
817 SPLDECL(s);
818 int needed = 0, gen;
819 xlog_t *log = mp->m_log;
1da177e4 820
92821e2b 821 if (!xfs_fs_writable(mp))
1da177e4
LT		 822 return 0;
823
824 s = LOG_LOCK(log);
825 if (((log->l_covered_state == XLOG_STATE_COVER_NEED) ||
826 (log->l_covered_state == XLOG_STATE_COVER_NEED2))
827 && !xfs_trans_first_ail(mp, &gen)
828 && xlog_iclogs_empty(log)) {
829 if (log->l_covered_state == XLOG_STATE_COVER_NEED)
830 log->l_covered_state = XLOG_STATE_COVER_DONE;
831 else {
832 ASSERT(log->l_covered_state == XLOG_STATE_COVER_NEED2);
833 log->l_covered_state = XLOG_STATE_COVER_DONE2;
834 }
835 needed = 1;
836 }
837 LOG_UNLOCK(log, s);
014c2544 838 return needed;
1da177e4
LT		 839}
840
841/******************************************************************************
842 *
843 * local routines
844 *
845 ******************************************************************************
846 */
847
848/* xfs_trans_tail_ail returns 0 when there is nothing in the list.
849 * The log manager must keep track of the last LR which was committed
850 * to disk. The lsn of this LR will become the new tail_lsn whenever
851 * xfs_trans_tail_ail returns 0. If we don't do this, we run into
852 * the situation where stuff could be written into the log but nothing
853 * was ever in the AIL when asked. Eventually, we panic since the
854 * tail hits the head.
855 *
856 * We may be holding the log iclog lock upon entering this routine.
857 */
858xfs_lsn_t
859xlog_assign_tail_lsn(xfs_mount_t *mp)
860{
861 xfs_lsn_t tail_lsn;
862 SPLDECL(s);
863 xlog_t *log = mp->m_log;
864
865 tail_lsn = xfs_trans_tail_ail(mp);
866 s = GRANT_LOCK(log);
867 if (tail_lsn != 0) {
868 log->l_tail_lsn = tail_lsn;
869 } else {
870 tail_lsn = log->l_tail_lsn = log->l_last_sync_lsn;
871 }
872 GRANT_UNLOCK(log, s);
873
874 return tail_lsn;
875} /* xlog_assign_tail_lsn */
876
877
878/*
879 * Return the space in the log between the tail and the head. The head
880 * is passed in the cycle/bytes formal parms. In the special case where
881 * the reserve head has wrapped passed the tail, this calculation is no
882 * longer valid. In this case, just return 0 which means there is no space
883 * in the log. This works for all places where this function is called
884 * with the reserve head. Of course, if the write head were to ever
885 * wrap the tail, we should blow up. Rather than catch this case here,
886 * we depend on other ASSERTions in other parts of the code. XXXmiken
887 *
888 * This code also handles the case where the reservation head is behind
889 * the tail. The details of this case are described below, but the end
890 * result is that we return the size of the log as the amount of space left.
891 */
892int
893xlog_space_left(xlog_t *log, int cycle, int bytes)
894{
895 int free_bytes;
896 int tail_bytes;
897 int tail_cycle;
898
899 tail_bytes = BBTOB(BLOCK_LSN(log->l_tail_lsn));
900 tail_cycle = CYCLE_LSN(log->l_tail_lsn);
901 if ((tail_cycle == cycle) && (bytes >= tail_bytes)) {
902 free_bytes = log->l_logsize - (bytes - tail_bytes);
903 } else if ((tail_cycle + 1) < cycle) {
904 return 0;
905 } else if (tail_cycle < cycle) {
906 ASSERT(tail_cycle == (cycle - 1));
907 free_bytes = tail_bytes - bytes;
908 } else {
909 /*
910 * The reservation head is behind the tail.
911 * In this case we just want to return the size of the
912 * log as the amount of space left.
913 */
914 xfs_fs_cmn_err(CE_ALERT, log->l_mp,
915 "xlog_space_left: head behind tail\n"
916 " tail_cycle = %d, tail_bytes = %d\n"
917 " GH cycle = %d, GH bytes = %d",
918 tail_cycle, tail_bytes, cycle, bytes);
919 ASSERT(0);
920 free_bytes = log->l_logsize;
921 }
922 return free_bytes;
923} /* xlog_space_left */
924
925
926/*
927 * Log function which is called when an io completes.
928 *
929 * The log manager needs its own routine, in order to control what
930 * happens with the buffer after the write completes.
931 */
932void
933xlog_iodone(xfs_buf_t *bp)
934{
935 xlog_in_core_t *iclog;
936 xlog_t *l;
937 int aborted;
938
939 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *);
940 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long) 2);
941 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
942 aborted = 0;
943
944 /*
945 * Some versions of cpp barf on the recursive definition of
946 * ic_log -> hic_fields.ic_log and expand ic_log twice when
947 * it is passed through two macros. Workaround broken cpp.
948 */
949 l = iclog->ic_log;
950
951 /*
952 * Race to shutdown the filesystem if we see an error.
953 */
954 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp)), l->l_mp,
955 XFS_ERRTAG_IODONE_IOERR, XFS_RANDOM_IODONE_IOERR)) {
956 xfs_ioerror_alert("xlog_iodone", l->l_mp, bp, XFS_BUF_ADDR(bp));
957 XFS_BUF_STALE(bp);
7d04a335 958 xfs_force_shutdown(l->l_mp, SHUTDOWN_LOG_IO_ERROR);
1da177e4
LT		 959 /*
960 * This flag will be propagated to the trans-committed
961 * callback routines to let them know that the log-commit
962 * didn't succeed.
963 */
964 aborted = XFS_LI_ABORTED;
965 } else if (iclog->ic_state & XLOG_STATE_IOERROR) {
966 aborted = XFS_LI_ABORTED;
967 }
3db296f3
DC		 968
969 /* log I/O is always issued ASYNC */
970 ASSERT(XFS_BUF_ISASYNC(bp));
1da177e4 971 xlog_state_done_syncing(iclog, aborted);
3db296f3
DC		 972 /*
973 * do not reference the buffer (bp) here as we could race
974 * with it being freed after writing the unmount record to the
975 * log.
976 */
977
1da177e4
LT		 978} /* xlog_iodone */
979
980/*
981 * The bdstrat callback function for log bufs. This gives us a central
982 * place to trap bufs in case we get hit by a log I/O error and need to
983 * shutdown. Actually, in practice, even when we didn't get a log error,
984 * we transition the iclogs to IOERROR state *after* flushing all existing
985 * iclogs to disk. This is because we don't want anymore new transactions to be
986 * started or completed afterwards.
987 */
988STATIC int
989xlog_bdstrat_cb(struct xfs_buf *bp)
990{
991 xlog_in_core_t *iclog;
992
993 iclog = XFS_BUF_FSPRIVATE(bp, xlog_in_core_t *);
994
995 if ((iclog->ic_state & XLOG_STATE_IOERROR) == 0) {
996 /* note for irix bstrat will need struct bdevsw passed
997 * Fix the following macro if the code ever is merged
998 */
999 XFS_bdstrat(bp);
1000 return 0;
1001 }
1002
1003 xfs_buftrace("XLOG__BDSTRAT IOERROR", bp);
1004 XFS_BUF_ERROR(bp, EIO);
1005 XFS_BUF_STALE(bp);
1006 xfs_biodone(bp);
014c2544 1007 return XFS_ERROR(EIO);
1da177e4
LT		 1008
1009
1010}
1011
1012/*
1013 * Return size of each in-core log record buffer.
1014 *
1015 * Low memory machines only get 2 16KB buffers. We don't want to waste
1016 * memory here. However, all other machines get at least 2 32KB buffers.
1017 * The number is hard coded because we don't care about the minimum
1018 * memory size, just 32MB systems.
1019 *
1020 * If the filesystem blocksize is too large, we may need to choose a
1021 * larger size since the directory code currently logs entire blocks.
1022 */
1023
1024STATIC void
1025xlog_get_iclog_buffer_size(xfs_mount_t *mp,
1026 xlog_t *log)
1027{
1028 int size;
1029 int xhdrs;
1030
cfcbbbd0
NS		 1031 if (mp->m_logbufs <= 0) {
1032 if (xfs_physmem <= btoc(128*1024*1024)) {
1033 log->l_iclog_bufs = XLOG_MIN_ICLOGS;
1034 } else if (xfs_physmem <= btoc(400*1024*1024)) {
1035 log->l_iclog_bufs = XLOG_MED_ICLOGS;
1036 } else { /* 256K with 32K bufs */
1037 log->l_iclog_bufs = XLOG_MAX_ICLOGS;
1da177e4 1038 }
cfcbbbd0
NS		 1039 } else {
1040 log->l_iclog_bufs = mp->m_logbufs;
1da177e4
LT		 1041 }
1042
1043 /*
1044 * Buffer size passed in from mount system call.
1045 */
cfcbbbd0 1046 if (mp->m_logbsize > 0) {
1da177e4
LT		 1047 size = log->l_iclog_size = mp->m_logbsize;
1048 log->l_iclog_size_log = 0;
1049 while (size != 1) {
1050 log->l_iclog_size_log++;
1051 size >>= 1;
1052 }
1053
1054 if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) {
1055 /* # headers = size / 32K
1056 * one header holds cycles from 32K of data
1057 */
1058
1059 xhdrs = mp->m_logbsize / XLOG_HEADER_CYCLE_SIZE;
1060 if (mp->m_logbsize % XLOG_HEADER_CYCLE_SIZE)
1061 xhdrs++;
1062 log->l_iclog_hsize = xhdrs << BBSHIFT;
1063 log->l_iclog_heads = xhdrs;
1064 } else {
1065 ASSERT(mp->m_logbsize <= XLOG_BIG_RECORD_BSIZE);
1066 log->l_iclog_hsize = BBSIZE;
1067 log->l_iclog_heads = 1;
1068 }
cfcbbbd0 1069 goto done;
1da177e4
LT		 1070 }
1071
1072 /*
1073 * Special case machines that have less than 32MB of memory.
1074 * All machines with more memory use 32KB buffers.
1075 */
1076 if (xfs_physmem <= btoc(32*1024*1024)) {
1077 /* Don't change; min configuration */
1078 log->l_iclog_size = XLOG_RECORD_BSIZE; /* 16k */
1079 log->l_iclog_size_log = XLOG_RECORD_BSHIFT;
1080 } else {
1081 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE; /* 32k */
1082 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
1083 }
1084
1085 /* the default log size is 16k or 32k which is one header sector */
1086 log->l_iclog_hsize = BBSIZE;
1087 log->l_iclog_heads = 1;
1088
1089 /*
1090 * For 16KB, we use 3 32KB buffers. For 32KB block sizes, we use
1091 * 4 32KB buffers. For 64KB block sizes, we use 8 32KB buffers.
1092 */
1093 if (mp->m_sb.sb_blocksize >= 16*1024) {
1094 log->l_iclog_size = XLOG_BIG_RECORD_BSIZE;
1095 log->l_iclog_size_log = XLOG_BIG_RECORD_BSHIFT;
cfcbbbd0 1096 if (mp->m_logbufs <= 0) {
1da177e4
LT		 1097 switch (mp->m_sb.sb_blocksize) {
1098 case 16*1024: /* 16 KB */
1099 log->l_iclog_bufs = 3;
1100 break;
1101 case 32*1024: /* 32 KB */
1102 log->l_iclog_bufs = 4;
1103 break;
1104 case 64*1024: /* 64 KB */
1105 log->l_iclog_bufs = 8;
1106 break;
1107 default:
1108 xlog_panic("XFS: Invalid blocksize");
1109 break;
1110 }
1111 }
1112 }
cfcbbbd0
NS		 1113
1114done: /* are we being asked to make the sizes selected above visible? */
1115 if (mp->m_logbufs == 0)
1116 mp->m_logbufs = log->l_iclog_bufs;
1117 if (mp->m_logbsize == 0)
1118 mp->m_logbsize = log->l_iclog_size;
1da177e4
LT		 1119} /* xlog_get_iclog_buffer_size */
1120
1121
1122/*
1123 * This routine initializes some of the log structure for a given mount point.
1124 * Its primary purpose is to fill in enough, so recovery can occur. However,
1125 * some other stuff may be filled in too.
1126 */
1127STATIC xlog_t *
1128xlog_alloc_log(xfs_mount_t *mp,
1129 xfs_buftarg_t *log_target,
1130 xfs_daddr_t blk_offset,
1131 int num_bblks)
1132{
1133 xlog_t *log;
1134 xlog_rec_header_t *head;
1135 xlog_in_core_t **iclogp;
1136 xlog_in_core_t *iclog, *prev_iclog=NULL;
1137 xfs_buf_t *bp;
1138 int i;
1139 int iclogsize;
1140
1141 log = (xlog_t *)kmem_zalloc(sizeof(xlog_t), KM_SLEEP);
1142
1143 log->l_mp = mp;
1144 log->l_targ = log_target;
1145 log->l_logsize = BBTOB(num_bblks);
1146 log->l_logBBstart = blk_offset;
1147 log->l_logBBsize = num_bblks;
1148 log->l_covered_state = XLOG_STATE_COVER_IDLE;
1149 log->l_flags |= XLOG_ACTIVE_RECOVERY;
1150
1151 log->l_prev_block = -1;
1152 ASSIGN_ANY_LSN_HOST(log->l_tail_lsn, 1, 0);
1153 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */
1154 log->l_last_sync_lsn = log->l_tail_lsn;
1155 log->l_curr_cycle = 1; /* 0 is bad since this is initial value */
1156 log->l_grant_reserve_cycle = 1;
1157 log->l_grant_write_cycle = 1;
1158
1159 if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) {
1160 log->l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT;
1161 ASSERT(log->l_sectbb_log <= mp->m_sectbb_log);
1162 /* for larger sector sizes, must have v2 or external log */
1163 ASSERT(log->l_sectbb_log == 0 ||
1164 log->l_logBBstart == 0 ||
1165 XFS_SB_VERSION_HASLOGV2(&mp->m_sb));
1166 ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT);
1167 }
1168 log->l_sectbb_mask = (1 << log->l_sectbb_log) - 1;
1169
1170 xlog_get_iclog_buffer_size(mp, log);
1171
1172 bp = xfs_buf_get_empty(log->l_iclog_size, mp->m_logdev_targp);
1173 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone);
1174 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb);
1175 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
1176 ASSERT(XFS_BUF_ISBUSY(bp));
1177 ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
1178 log->l_xbuf = bp;
1179
1180 spinlock_init(&log->l_icloglock, "iclog");
1181 spinlock_init(&log->l_grant_lock, "grhead_iclog");
1182 initnsema(&log->l_flushsema, 0, "ic-flush");
1183 xlog_state_ticket_alloc(log); /* wait until after icloglock inited */
1184
1185 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */
1186 ASSERT((XFS_BUF_SIZE(bp) & BBMASK) == 0);
1187
1188 iclogp = &log->l_iclog;
1189 /*
1190 * The amount of memory to allocate for the iclog structure is
1191 * rather funky due to the way the structure is defined. It is
1192 * done this way so that we can use different sizes for machines
1193 * with different amounts of memory. See the definition of
1194 * xlog_in_core_t in xfs_log_priv.h for details.
1195 */
1196 iclogsize = log->l_iclog_size;
1197 ASSERT(log->l_iclog_size >= 4096);
1198 for (i=0; i < log->l_iclog_bufs; i++) {
1199 *iclogp = (xlog_in_core_t *)
1200 kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP);
1201 iclog = *iclogp;
1da177e4
LT		 1202 iclog->ic_prev = prev_iclog;
1203 prev_iclog = iclog;
1fa40b01
CH		 1204
1205 bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp);
1206 if (!XFS_BUF_CPSEMA(bp))
1207 ASSERT(0);
1208 XFS_BUF_SET_IODONE_FUNC(bp, xlog_iodone);
1209 XFS_BUF_SET_BDSTRAT_FUNC(bp, xlog_bdstrat_cb);
1210 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)1);
1211 iclog->ic_bp = bp;
1212 iclog->hic_data = bp->b_addr;
1213
1da177e4
LT		 1214 log->l_iclog_bak[i] = (xfs_caddr_t)&(iclog->ic_header);
1215
1216 head = &iclog->ic_header;
1217 memset(head, 0, sizeof(xlog_rec_header_t));
1218 INT_SET(head->h_magicno, ARCH_CONVERT, XLOG_HEADER_MAGIC_NUM);
1219 INT_SET(head->h_version, ARCH_CONVERT,
1220 XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) ? 2 : 1);
1221 INT_SET(head->h_size, ARCH_CONVERT, log->l_iclog_size);
1222 /* new fields */
1223 INT_SET(head->h_fmt, ARCH_CONVERT, XLOG_FMT);
1224 memcpy(&head->h_fs_uuid, &mp->m_sb.sb_uuid, sizeof(uuid_t));
1225
1da177e4
LT		 1226
1227 iclog->ic_size = XFS_BUF_SIZE(bp) - log->l_iclog_hsize;
1228 iclog->ic_state = XLOG_STATE_ACTIVE;
1229 iclog->ic_log = log;
1230 iclog->ic_callback_tail = &(iclog->ic_callback);
1231 iclog->ic_datap = (char *)iclog->hic_data + log->l_iclog_hsize;
1232
1233 ASSERT(XFS_BUF_ISBUSY(iclog->ic_bp));
1234 ASSERT(XFS_BUF_VALUSEMA(iclog->ic_bp) <= 0);
1235 sv_init(&iclog->ic_forcesema, SV_DEFAULT, "iclog-force");
1236 sv_init(&iclog->ic_writesema, SV_DEFAULT, "iclog-write");
1237
1238 iclogp = &iclog->ic_next;
1239 }
1240 *iclogp = log->l_iclog; /* complete ring */
1241 log->l_iclog->ic_prev = prev_iclog; /* re-write 1st prev ptr */
1242
1243 return log;
1244} /* xlog_alloc_log */
1245
1246
1247/*
1248 * Write out the commit record of a transaction associated with the given
1249 * ticket. Return the lsn of the commit record.
1250 */
1251STATIC int
1252xlog_commit_record(xfs_mount_t *mp,
1253 xlog_ticket_t *ticket,
1254 xlog_in_core_t **iclog,
1255 xfs_lsn_t *commitlsnp)
1256{
1257 int error;
1258 xfs_log_iovec_t reg[1];
1259
1260 reg[0].i_addr = NULL;
1261 reg[0].i_len = 0;
7e9c6396 1262 XLOG_VEC_SET_TYPE(&reg[0], XLOG_REG_TYPE_COMMIT);
1da177e4
LT		 1263
1264 ASSERT_ALWAYS(iclog);
1265 if ((error = xlog_write(mp, reg, 1, ticket, commitlsnp,
1266 iclog, XLOG_COMMIT_TRANS))) {
7d04a335 1267 xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
1da177e4 1268 }
014c2544 1269 return error;
1da177e4
LT		 1270} /* xlog_commit_record */
1271
1272
1273/*
1274 * Push on the buffer cache code if we ever use more than 75% of the on-disk
1275 * log space. This code pushes on the lsn which would supposedly free up
1276 * the 25% which we want to leave free. We may need to adopt a policy which
1277 * pushes on an lsn which is further along in the log once we reach the high
1278 * water mark. In this manner, we would be creating a low water mark.
1279 */
1280void
1281xlog_grant_push_ail(xfs_mount_t *mp,
1282 int need_bytes)
1283{
1284 xlog_t *log = mp->m_log; /* pointer to the log */
1285 xfs_lsn_t tail_lsn; /* lsn of the log tail */
1286 xfs_lsn_t threshold_lsn = 0; /* lsn we'd like to be at */
1287 int free_blocks; /* free blocks left to write to */
1288 int free_bytes; /* free bytes left to write to */
1289 int threshold_block; /* block in lsn we'd like to be at */
1290 int threshold_cycle; /* lsn cycle we'd like to be at */
1291 int free_threshold;
1292 SPLDECL(s);
1293
1294 ASSERT(BTOBB(need_bytes) < log->l_logBBsize);
1295
1296 s = GRANT_LOCK(log);
1297 free_bytes = xlog_space_left(log,
1298 log->l_grant_reserve_cycle,
1299 log->l_grant_reserve_bytes);
1300 tail_lsn = log->l_tail_lsn;
1301 free_blocks = BTOBBT(free_bytes);
1302
1303 /*
1304 * Set the threshold for the minimum number of free blocks in the
1305 * log to the maximum of what the caller needs, one quarter of the
1306 * log, and 256 blocks.
1307 */
1308 free_threshold = BTOBB(need_bytes);
1309 free_threshold = MAX(free_threshold, (log->l_logBBsize >> 2));
1310 free_threshold = MAX(free_threshold, 256);
1311 if (free_blocks < free_threshold) {
1312 threshold_block = BLOCK_LSN(tail_lsn) + free_threshold;
1313 threshold_cycle = CYCLE_LSN(tail_lsn);
1314 if (threshold_block >= log->l_logBBsize) {
1315 threshold_block -= log->l_logBBsize;
1316 threshold_cycle += 1;
1317 }
1318 ASSIGN_ANY_LSN_HOST(threshold_lsn, threshold_cycle,
1319 threshold_block);
1320
1321 /* Don't pass in an lsn greater than the lsn of the last
1322 * log record known to be on disk.
1323 */
1324 if (XFS_LSN_CMP(threshold_lsn, log->l_last_sync_lsn) > 0)
1325 threshold_lsn = log->l_last_sync_lsn;
1326 }
1327 GRANT_UNLOCK(log, s);
1328
1329 /*
1330 * Get the transaction layer to kick the dirty buffers out to
1331 * disk asynchronously. No point in trying to do this if
1332 * the filesystem is shutting down.
1333 */
1334 if (threshold_lsn &&
1335 !XLOG_FORCED_SHUTDOWN(log))
1336 xfs_trans_push_ail(mp, threshold_lsn);
1337} /* xlog_grant_push_ail */
1338
1339
1340/*
1341 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous
1342 * fashion. Previously, we should have moved the current iclog
1343 * ptr in the log to point to the next available iclog. This allows further
1344 * write to continue while this code syncs out an iclog ready to go.
1345 * Before an in-core log can be written out, the data section must be scanned
1346 * to save away the 1st word of each BBSIZE block into the header. We replace
1347 * it with the current cycle count. Each BBSIZE block is tagged with the
1348 * cycle count because there in an implicit assumption that drives will
1349 * guarantee that entire 512 byte blocks get written at once. In other words,
1350 * we can't have part of a 512 byte block written and part not written. By
1351 * tagging each block, we will know which blocks are valid when recovering
1352 * after an unclean shutdown.
1353 *
1354 * This routine is single threaded on the iclog. No other thread can be in
1355 * this routine with the same iclog. Changing contents of iclog can there-
1356 * fore be done without grabbing the state machine lock. Updating the global
1357 * log will require grabbing the lock though.
1358 *
1359 * The entire log manager uses a logical block numbering scheme. Only
1360 * log_sync (and then only bwrite()) know about the fact that the log may
1361 * not start with block zero on a given device. The log block start offset
1362 * is added immediately before calling bwrite().
1363 */
1364
1365int
1366xlog_sync(xlog_t *log,
1367 xlog_in_core_t *iclog)
1368{
1369 xfs_caddr_t dptr; /* pointer to byte sized element */
1370 xfs_buf_t *bp;
1371 int i, ops;
1372 uint count; /* byte count of bwrite */
1373 uint count_init; /* initial count before roundup */
1374 int roundoff; /* roundoff to BB or stripe */
1375 int split = 0; /* split write into two regions */
1376 int error;
1377 SPLDECL(s);
1378 int v2 = XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb);
1379
1380 XFS_STATS_INC(xs_log_writes);
1381 ASSERT(iclog->ic_refcnt == 0);
1382
1383 /* Add for LR header */
1384 count_init = log->l_iclog_hsize + iclog->ic_offset;
1385
1386 /* Round out the log write size */
1387 if (v2 && log->l_mp->m_sb.sb_logsunit > 1) {
1388 /* we have a v2 stripe unit to use */
1389 count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init));
1390 } else {
1391 count = BBTOB(BTOBB(count_init));
1392 }
1393 roundoff = count - count_init;
1394 ASSERT(roundoff >= 0);
1395 ASSERT((v2 && log->l_mp->m_sb.sb_logsunit > 1 &&
1396 roundoff < log->l_mp->m_sb.sb_logsunit)
1397 ||
1398 (log->l_mp->m_sb.sb_logsunit <= 1 &&
1399 roundoff < BBTOB(1)));
1400
1401 /* move grant heads by roundoff in sync */
1402 s = GRANT_LOCK(log);
dd954c69 1403 xlog_grant_add_space(log, roundoff);
1da177e4
LT		 1404 GRANT_UNLOCK(log, s);
1405
1406 /* put cycle number in every block */
1407 xlog_pack_data(log, iclog, roundoff);
1408
1409 /* real byte length */
1410 if (v2) {
1411 INT_SET(iclog->ic_header.h_len,
1412 ARCH_CONVERT,
1413 iclog->ic_offset + roundoff);
1414 } else {
1415 INT_SET(iclog->ic_header.h_len, ARCH_CONVERT, iclog->ic_offset);
1416 }
1417
1418 /* put ops count in correct order */
1419 ops = iclog->ic_header.h_num_logops;
1420 INT_SET(iclog->ic_header.h_num_logops, ARCH_CONVERT, ops);
1421
f5faad79 1422 bp = iclog->ic_bp;
1da177e4
LT		 1423 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) == (unsigned long)1);
1424 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2);
1425 XFS_BUF_SET_ADDR(bp, BLOCK_LSN(INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT)));
1426
1427 XFS_STATS_ADD(xs_log_blocks, BTOBB(count));
1428
1429 /* Do we need to split this write into 2 parts? */
1430 if (XFS_BUF_ADDR(bp) + BTOBB(count) > log->l_logBBsize) {
1431 split = count - (BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp)));
1432 count = BBTOB(log->l_logBBsize - XFS_BUF_ADDR(bp));
1433 iclog->ic_bwritecnt = 2; /* split into 2 writes */
1434 } else {
1435 iclog->ic_bwritecnt = 1;
1436 }
511105b3 1437 XFS_BUF_SET_COUNT(bp, count);
1da177e4 1438 XFS_BUF_SET_FSPRIVATE(bp, iclog); /* save for later */
f5faad79 1439 XFS_BUF_ZEROFLAGS(bp);
1da177e4
LT		 1440 XFS_BUF_BUSY(bp);
1441 XFS_BUF_ASYNC(bp);
1442 /*
f538d4da 1443 * Do an ordered write for the log block.
f5faad79 1444 * Its unnecessary to flush the first split block in the log wrap case.
1da177e4 1445 */
f5faad79 1446 if (!split && (log->l_mp->m_flags & XFS_MOUNT_BARRIER))
f538d4da 1447 XFS_BUF_ORDERED(bp);
1da177e4
LT		 1448
1449 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
1450 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
1451
1452 xlog_verify_iclog(log, iclog, count, B_TRUE);
1453
1454 /* account for log which doesn't start at block #0 */
1455 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
1456 /*
1457 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem
1458 * is shutting down.
1459 */
1460 XFS_BUF_WRITE(bp);
1461
1462 if ((error = XFS_bwrite(bp))) {
1463 xfs_ioerror_alert("xlog_sync", log->l_mp, bp,
1464 XFS_BUF_ADDR(bp));
014c2544 1465 return error;
1da177e4
LT		 1466 }
1467 if (split) {
f5faad79 1468 bp = iclog->ic_log->l_xbuf;
1da177e4
LT		 1469 ASSERT(XFS_BUF_FSPRIVATE2(bp, unsigned long) ==
1470 (unsigned long)1);
1471 XFS_BUF_SET_FSPRIVATE2(bp, (unsigned long)2);
1472 XFS_BUF_SET_ADDR(bp, 0); /* logical 0 */
1473 XFS_BUF_SET_PTR(bp, (xfs_caddr_t)((__psint_t)&(iclog->ic_header)+
1474 (__psint_t)count), split);
1475 XFS_BUF_SET_FSPRIVATE(bp, iclog);
f5faad79 1476 XFS_BUF_ZEROFLAGS(bp);
1da177e4
LT		 1477 XFS_BUF_BUSY(bp);
1478 XFS_BUF_ASYNC(bp);
f538d4da
CH		 1479 if (log->l_mp->m_flags & XFS_MOUNT_BARRIER)
1480 XFS_BUF_ORDERED(bp);
1da177e4
LT		 1481 dptr = XFS_BUF_PTR(bp);
1482 /*
1483 * Bump the cycle numbers at the start of each block
1484 * since this part of the buffer is at the start of
1485 * a new cycle. Watch out for the header magic number
1486 * case, though.
1487 */
1488 for (i=0; i<split; i += BBSIZE) {
1489 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1);
1490 if (INT_GET(*(uint *)dptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM)
1491 INT_MOD(*(uint *)dptr, ARCH_CONVERT, +1);
1492 dptr += BBSIZE;
1493 }
1494
1495 ASSERT(XFS_BUF_ADDR(bp) <= log->l_logBBsize-1);
1496 ASSERT(XFS_BUF_ADDR(bp) + BTOBB(count) <= log->l_logBBsize);
1497
c41564b5 1498 /* account for internal log which doesn't start at block #0 */
1da177e4
LT		 1499 XFS_BUF_SET_ADDR(bp, XFS_BUF_ADDR(bp) + log->l_logBBstart);
1500 XFS_BUF_WRITE(bp);
1501 if ((error = XFS_bwrite(bp))) {
1502 xfs_ioerror_alert("xlog_sync (split)", log->l_mp,
1503 bp, XFS_BUF_ADDR(bp));
014c2544 1504 return error;
1da177e4
LT		 1505 }
1506 }
014c2544 1507 return 0;
1da177e4
LT		 1508} /* xlog_sync */
1509
1510
1511/*
c41564b5 1512 * Deallocate a log structure
1da177e4
LT		 1513 */
1514void
c41564b5 1515xlog_dealloc_log(xlog_t *log)
1da177e4
LT		 1516{
1517 xlog_in_core_t *iclog, *next_iclog;
1518 xlog_ticket_t *tic, *next_tic;
1519 int i;
1520
1521
1522 iclog = log->l_iclog;
1523 for (i=0; i<log->l_iclog_bufs; i++) {
1524 sv_destroy(&iclog->ic_forcesema);
1525 sv_destroy(&iclog->ic_writesema);
1526 xfs_buf_free(iclog->ic_bp);
1527#ifdef XFS_LOG_TRACE
1528 if (iclog->ic_trace != NULL) {
1529 ktrace_free(iclog->ic_trace);
1530 }
1531#endif
1532 next_iclog = iclog->ic_next;
1da177e4
LT		 1533 kmem_free(iclog, sizeof(xlog_in_core_t));
1534 iclog = next_iclog;
1535 }
1536 freesema(&log->l_flushsema);
1537 spinlock_destroy(&log->l_icloglock);
1538 spinlock_destroy(&log->l_grant_lock);
1539
1540 /* XXXsup take a look at this again. */
1541 if ((log->l_ticket_cnt != log->l_ticket_tcnt) &&
1542 !XLOG_FORCED_SHUTDOWN(log)) {
1543 xfs_fs_cmn_err(CE_WARN, log->l_mp,
c41564b5 1544 "xlog_dealloc_log: (cnt: %d, total: %d)",
1da177e4
LT		 1545 log->l_ticket_cnt, log->l_ticket_tcnt);
1546 /* ASSERT(log->l_ticket_cnt == log->l_ticket_tcnt); */
1547
1548 } else {
1549 tic = log->l_unmount_free;
1550 while (tic) {
1551 next_tic = tic->t_next;
1552 kmem_free(tic, NBPP);
1553 tic = next_tic;
1554 }
1555 }
1556 xfs_buf_free(log->l_xbuf);
1557#ifdef XFS_LOG_TRACE
1558 if (log->l_trace != NULL) {
1559 ktrace_free(log->l_trace);
1560 }
1561 if (log->l_grant_trace != NULL) {
1562 ktrace_free(log->l_grant_trace);
1563 }
1564#endif
1565 log->l_mp->m_log = NULL;
1566 kmem_free(log, sizeof(xlog_t));
c41564b5 1567} /* xlog_dealloc_log */
1da177e4
LT		 1568
1569/*
1570 * Update counters atomically now that memcpy is done.
1571 */
1572/* ARGSUSED */
1573static inline void
1574xlog_state_finish_copy(xlog_t *log,
1575 xlog_in_core_t *iclog,
1576 int record_cnt,
1577 int copy_bytes)
1578{
1579 SPLDECL(s);
1580
1581 s = LOG_LOCK(log);
1582
1583 iclog->ic_header.h_num_logops += record_cnt;
1584 iclog->ic_offset += copy_bytes;
1585
1586 LOG_UNLOCK(log, s);
1587} /* xlog_state_finish_copy */
1588
1589
1590
1591
7e9c6396
TS		 1592/*
1593 * print out info relating to regions written which consume
1594 * the reservation
1595 */
7e9c6396
TS		 1596STATIC void
1597xlog_print_tic_res(xfs_mount_t *mp, xlog_ticket_t *ticket)
1598{
1599 uint i;
1600 uint ophdr_spc = ticket->t_res_num_ophdrs * (uint)sizeof(xlog_op_header_t);
1601
1602 /* match with XLOG_REG_TYPE_* in xfs_log.h */
1603 static char *res_type_str[XLOG_REG_TYPE_MAX] = {
1604 "bformat",
1605 "bchunk",
1606 "efi_format",
1607 "efd_format",
1608 "iformat",
1609 "icore",
1610 "iext",
1611 "ibroot",
1612 "ilocal",
1613 "iattr_ext",
1614 "iattr_broot",
1615 "iattr_local",
1616 "qformat",
1617 "dquot",
1618 "quotaoff",
1619 "LR header",
1620 "unmount",
1621 "commit",
1622 "trans header"
1623 };
1624 static char *trans_type_str[XFS_TRANS_TYPE_MAX] = {
1625 "SETATTR_NOT_SIZE",
1626 "SETATTR_SIZE",
1627 "INACTIVE",
1628 "CREATE",
1629 "CREATE_TRUNC",
1630 "TRUNCATE_FILE",
1631 "REMOVE",
1632 "LINK",
1633 "RENAME",
1634 "MKDIR",
1635 "RMDIR",
1636 "SYMLINK",
1637 "SET_DMATTRS",
1638 "GROWFS",
1639 "STRAT_WRITE",
1640 "DIOSTRAT",
1641 "WRITE_SYNC",
1642 "WRITEID",
1643 "ADDAFORK",
1644 "ATTRINVAL",
1645 "ATRUNCATE",
1646 "ATTR_SET",
1647 "ATTR_RM",
1648 "ATTR_FLAG",
1649 "CLEAR_AGI_BUCKET",
1650 "QM_SBCHANGE",
1651 "DUMMY1",
1652 "DUMMY2",
1653 "QM_QUOTAOFF",
1654 "QM_DQALLOC",
1655 "QM_SETQLIM",
1656 "QM_DQCLUSTER",
1657 "QM_QINOCREATE",
1658 "QM_QUOTAOFF_END",
1659 "SB_UNIT",
1660 "FSYNC_TS",
1661 "GROWFSRT_ALLOC",
1662 "GROWFSRT_ZERO",
1663 "GROWFSRT_FREE",
1664 "SWAPEXT"
1665 };
1666
1667 xfs_fs_cmn_err(CE_WARN, mp,
1668 "xfs_log_write: reservation summary:\n"
1669 " trans type = %s (%u)\n"
1670 " unit res = %d bytes\n"
1671 " current res = %d bytes\n"
1672 " total reg = %u bytes (o/flow = %u bytes)\n"
1673 " ophdrs = %u (ophdr space = %u bytes)\n"
1674 " ophdr + reg = %u bytes\n"
1675 " num regions = %u\n",
1676 ((ticket->t_trans_type <= 0 ||
1677 ticket->t_trans_type > XFS_TRANS_TYPE_MAX) ?
1678 "bad-trans-type" : trans_type_str[ticket->t_trans_type-1]),
1679 ticket->t_trans_type,
1680 ticket->t_unit_res,
1681 ticket->t_curr_res,
1682 ticket->t_res_arr_sum, ticket->t_res_o_flow,
1683 ticket->t_res_num_ophdrs, ophdr_spc,
1684 ticket->t_res_arr_sum +
1259845d 1685 ticket->t_res_o_flow + ophdr_spc,
7e9c6396
TS		 1686 ticket->t_res_num);
1687
1688 for (i = 0; i < ticket->t_res_num; i++) {
1259845d 1689 uint r_type = ticket->t_res_arr[i].r_type;
7e9c6396
TS		 1690 cmn_err(CE_WARN,
1691 "region[%u]: %s - %u bytes\n",
1692 i,
1693 ((r_type <= 0 || r_type > XLOG_REG_TYPE_MAX) ?
1694 "bad-rtype" : res_type_str[r_type-1]),
1695 ticket->t_res_arr[i].r_len);
1696 }
1697}
7e9c6396 1698
1da177e4
LT		 1699/*
1700 * Write some region out to in-core log
1701 *
1702 * This will be called when writing externally provided regions or when
1703 * writing out a commit record for a given transaction.
1704 *
1705 * General algorithm:
1706 * 1. Find total length of this write. This may include adding to the
1707 * lengths passed in.
1708 * 2. Check whether we violate the tickets reservation.
1709 * 3. While writing to this iclog
1710 * A. Reserve as much space in this iclog as can get
1711 * B. If this is first write, save away start lsn
1712 * C. While writing this region:
1713 * 1. If first write of transaction, write start record
1714 * 2. Write log operation header (header per region)
1715 * 3. Find out if we can fit entire region into this iclog
1716 * 4. Potentially, verify destination memcpy ptr
1717 * 5. Memcpy (partial) region
1718 * 6. If partial copy, release iclog; otherwise, continue
1719 * copying more regions into current iclog
1720 * 4. Mark want sync bit (in simulation mode)
1721 * 5. Release iclog for potential flush to on-disk log.
1722 *
1723 * ERRORS:
1724 * 1. Panic if reservation is overrun. This should never happen since
1725 * reservation amounts are generated internal to the filesystem.
1726 * NOTES:
1727 * 1. Tickets are single threaded data structures.
1728 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the
1729 * syncing routine. When a single log_write region needs to span
1730 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set
1731 * on all log operation writes which don't contain the end of the
1732 * region. The XLOG_END_TRANS bit is used for the in-core log
1733 * operation which contains the end of the continued log_write region.
1734 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog,
1735 * we don't really know exactly how much space will be used. As a result,
1736 * we don't update ic_offset until the end when we know exactly how many
1737 * bytes have been written out.
1738 */
1739int
1740xlog_write(xfs_mount_t * mp,
1741 xfs_log_iovec_t reg[],
1742 int nentries,
1743 xfs_log_ticket_t tic,
1744 xfs_lsn_t *start_lsn,
1745 xlog_in_core_t **commit_iclog,
1746 uint flags)
1747{
5493a0fc 1748 xlog_t *log = mp->m_log;
1da177e4 1749 xlog_ticket_t *ticket = (xlog_ticket_t *)tic;
5493a0fc 1750 xlog_in_core_t *iclog = NULL; /* ptr to current in-core log */
1da177e4 1751 xlog_op_header_t *logop_head; /* ptr to log operation header */
1da177e4
LT		 1752 __psint_t ptr; /* copy address into data region */
1753 int len; /* # xlog_write() bytes 2 still copy */
1754 int index; /* region index currently copying */
1755 int log_offset; /* offset (from 0) into data region */
1756 int start_rec_copy; /* # bytes to copy for start record */
1757 int partial_copy; /* did we split a region? */
1758 int partial_copy_len;/* # bytes copied if split region */
1759 int need_copy; /* # bytes need to memcpy this region */
1760 int copy_len; /* # bytes actually memcpy'ing */
1761 int copy_off; /* # bytes from entry start */
1762 int contwr; /* continued write of in-core log? */
1763 int error;
1764 int record_cnt = 0, data_cnt = 0;
1765
1766 partial_copy_len = partial_copy = 0;
1767
1768 /* Calculate potential maximum space. Each region gets its own
1769 * xlog_op_header_t and may need to be double word aligned.
1770 */
1771 len = 0;
7e9c6396 1772 if (ticket->t_flags & XLOG_TIC_INITED) { /* acct for start rec of xact */
1da177e4 1773 len += sizeof(xlog_op_header_t);
7e9c6396
TS		 1774 XLOG_TIC_ADD_OPHDR(ticket);
1775 }
1da177e4
LT		 1776
1777 for (index = 0; index < nentries; index++) {
1778 len += sizeof(xlog_op_header_t); /* each region gets >= 1 */
7e9c6396 1779 XLOG_TIC_ADD_OPHDR(ticket);
1da177e4 1780 len += reg[index].i_len;
7e9c6396 1781 XLOG_TIC_ADD_REGION(ticket, reg[index].i_len, reg[index].i_type);
1da177e4
LT		 1782 }
1783 contwr = *start_lsn = 0;
1784
1785 if (ticket->t_curr_res < len) {
7e9c6396 1786 xlog_print_tic_res(mp, ticket);
1da177e4
LT		 1787#ifdef DEBUG
1788 xlog_panic(
1789 "xfs_log_write: reservation ran out. Need to up reservation");
1790#else
1791 /* Customer configurable panic */
1792 xfs_cmn_err(XFS_PTAG_LOGRES, CE_ALERT, mp,
1793 "xfs_log_write: reservation ran out. Need to up reservation");
1794 /* If we did not panic, shutdown the filesystem */
7d04a335 1795 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1da177e4
LT		 1796#endif
1797 } else
1798 ticket->t_curr_res -= len;
1799
1800 for (index = 0; index < nentries; ) {
1801 if ((error = xlog_state_get_iclog_space(log, len, &iclog, ticket,
1802 &contwr, &log_offset)))
014c2544 1803 return error;
1da177e4
LT		 1804
1805 ASSERT(log_offset <= iclog->ic_size - 1);
1806 ptr = (__psint_t) ((char *)iclog->ic_datap+log_offset);
1807
1808 /* start_lsn is the first lsn written to. That's all we need. */
1809 if (! *start_lsn)
1810 *start_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT);
1811
1812 /* This loop writes out as many regions as can fit in the amount
1813 * of space which was allocated by xlog_state_get_iclog_space().
1814 */
1815 while (index < nentries) {
1816 ASSERT(reg[index].i_len % sizeof(__int32_t) == 0);
1817 ASSERT((__psint_t)ptr % sizeof(__int32_t) == 0);
1818 start_rec_copy = 0;
1819
1820 /* If first write for transaction, insert start record.
1821 * We can't be trying to commit if we are inited. We can't
1822 * have any "partial_copy" if we are inited.
1823 */
1824 if (ticket->t_flags & XLOG_TIC_INITED) {
1825 logop_head = (xlog_op_header_t *)ptr;
1826 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid);
1827 logop_head->oh_clientid = ticket->t_clientid;
1828 logop_head->oh_len = 0;
1829 logop_head->oh_flags = XLOG_START_TRANS;
1830 logop_head->oh_res2 = 0;
1831 ticket->t_flags &= ~XLOG_TIC_INITED; /* clear bit */
1832 record_cnt++;
1833
1834 start_rec_copy = sizeof(xlog_op_header_t);
1835 xlog_write_adv_cnt(ptr, len, log_offset, start_rec_copy);
1836 }
1837
1838 /* Copy log operation header directly into data section */
1839 logop_head = (xlog_op_header_t *)ptr;
1840 INT_SET(logop_head->oh_tid, ARCH_CONVERT, ticket->t_tid);
1841 logop_head->oh_clientid = ticket->t_clientid;
1842 logop_head->oh_res2 = 0;
1843
1844 /* header copied directly */
1845 xlog_write_adv_cnt(ptr, len, log_offset, sizeof(xlog_op_header_t));
1846
1847 /* are we copying a commit or unmount record? */
1848 logop_head->oh_flags = flags;
1849
1850 /*
1851 * We've seen logs corrupted with bad transaction client
1852 * ids. This makes sure that XFS doesn't generate them on.
1853 * Turn this into an EIO and shut down the filesystem.
1854 */
1855 switch (logop_head->oh_clientid) {
1856 case XFS_TRANSACTION:
1857 case XFS_VOLUME:
1858 case XFS_LOG:
1859 break;
1860 default:
1861 xfs_fs_cmn_err(CE_WARN, mp,
1862 "Bad XFS transaction clientid 0x%x in ticket 0x%p",
1863 logop_head->oh_clientid, tic);
1864 return XFS_ERROR(EIO);
1865 }
1866
1867 /* Partial write last time? => (partial_copy != 0)
1868 * need_copy is the amount we'd like to copy if everything could
1869 * fit in the current memcpy.
1870 */
1871 need_copy = reg[index].i_len - partial_copy_len;
1872
1873 copy_off = partial_copy_len;
1874 if (need_copy <= iclog->ic_size - log_offset) { /*complete write */
1875 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len = need_copy);
1876 if (partial_copy)
1877 logop_head->oh_flags|= (XLOG_END_TRANS|XLOG_WAS_CONT_TRANS);
1878 partial_copy_len = partial_copy = 0;
1879 } else { /* partial write */
1880 copy_len = iclog->ic_size - log_offset;
1881 INT_SET(logop_head->oh_len, ARCH_CONVERT, copy_len);
1882 logop_head->oh_flags |= XLOG_CONTINUE_TRANS;
1883 if (partial_copy)
1884 logop_head->oh_flags |= XLOG_WAS_CONT_TRANS;
1885 partial_copy_len += copy_len;
1886 partial_copy++;
1887 len += sizeof(xlog_op_header_t); /* from splitting of region */
1888 /* account for new log op header */
1889 ticket->t_curr_res -= sizeof(xlog_op_header_t);
7e9c6396 1890 XLOG_TIC_ADD_OPHDR(ticket);
1da177e4
LT		 1891 }
1892 xlog_verify_dest_ptr(log, ptr);
1893
1894 /* copy region */
1895 ASSERT(copy_len >= 0);
1896 memcpy((xfs_caddr_t)ptr, reg[index].i_addr + copy_off, copy_len);
1897 xlog_write_adv_cnt(ptr, len, log_offset, copy_len);
1898
1899 /* make copy_len total bytes copied, including headers */
1900 copy_len += start_rec_copy + sizeof(xlog_op_header_t);
1901 record_cnt++;
1902 data_cnt += contwr ? copy_len : 0;
1903 if (partial_copy) { /* copied partial region */
1904 /* already marked WANT_SYNC by xlog_state_get_iclog_space */
1905 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
1906 record_cnt = data_cnt = 0;
1907 if ((error = xlog_state_release_iclog(log, iclog)))
014c2544 1908 return error;
1da177e4
LT		 1909 break; /* don't increment index */
1910 } else { /* copied entire region */
1911 index++;
1912 partial_copy_len = partial_copy = 0;
1913
1914 if (iclog->ic_size - log_offset <= sizeof(xlog_op_header_t)) {
1915 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
1916 record_cnt = data_cnt = 0;
1917 xlog_state_want_sync(log, iclog);
1918 if (commit_iclog) {
1919 ASSERT(flags & XLOG_COMMIT_TRANS);
1920 *commit_iclog = iclog;
1921 } else if ((error = xlog_state_release_iclog(log, iclog)))
014c2544 1922 return error;
1da177e4
LT		 1923 if (index == nentries)
1924 return 0; /* we are done */
1925 else
1926 break;
1927 }
1928 } /* if (partial_copy) */
1929 } /* while (index < nentries) */
1930 } /* for (index = 0; index < nentries; ) */
1931 ASSERT(len == 0);
1932
1933 xlog_state_finish_copy(log, iclog, record_cnt, data_cnt);
1934 if (commit_iclog) {
1935 ASSERT(flags & XLOG_COMMIT_TRANS);
1936 *commit_iclog = iclog;
1937 return 0;
1938 }
014c2544 1939 return xlog_state_release_iclog(log, iclog);
1da177e4
LT		 1940} /* xlog_write */
1941
1942
1943/*****************************************************************************
1944 *
1945 * State Machine functions
1946 *
1947 *****************************************************************************
1948 */
1949
1950/* Clean iclogs starting from the head. This ordering must be
1951 * maintained, so an iclog doesn't become ACTIVE beyond one that
1952 * is SYNCING. This is also required to maintain the notion that we use
1953 * a counting semaphore to hold off would be writers to the log when every
1954 * iclog is trying to sync to disk.
1955 *
1956 * State Change: DIRTY -> ACTIVE
1957 */
ba0f32d4 1958STATIC void
1da177e4
LT		 1959xlog_state_clean_log(xlog_t *log)
1960{
1961 xlog_in_core_t *iclog;
1962 int changed = 0;
1963
1964 iclog = log->l_iclog;
1965 do {
1966 if (iclog->ic_state == XLOG_STATE_DIRTY) {
1967 iclog->ic_state = XLOG_STATE_ACTIVE;
1968 iclog->ic_offset = 0;
1969 iclog->ic_callback = NULL; /* don't need to free */
1970 /*
1971 * If the number of ops in this iclog indicate it just
1972 * contains the dummy transaction, we can
1973 * change state into IDLE (the second time around).
1974 * Otherwise we should change the state into
1975 * NEED a dummy.
1976 * We don't need to cover the dummy.
1977 */
1978 if (!changed &&
1979 (INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT) == XLOG_COVER_OPS)) {
1980 changed = 1;
1981 } else {
1982 /*
1983 * We have two dirty iclogs so start over
1984 * This could also be num of ops indicates
1985 * this is not the dummy going out.
1986 */
1987 changed = 2;
1988 }
1989 iclog->ic_header.h_num_logops = 0;
1990 memset(iclog->ic_header.h_cycle_data, 0,
1991 sizeof(iclog->ic_header.h_cycle_data));
1992 iclog->ic_header.h_lsn = 0;
1993 } else if (iclog->ic_state == XLOG_STATE_ACTIVE)
1994 /* do nothing */;
1995 else
1996 break; /* stop cleaning */
1997 iclog = iclog->ic_next;
1998 } while (iclog != log->l_iclog);
1999
2000 /* log is locked when we are called */
2001 /*
2002 * Change state for the dummy log recording.
2003 * We usually go to NEED. But we go to NEED2 if the changed indicates
2004 * we are done writing the dummy record.
2005 * If we are done with the second dummy recored (DONE2), then
2006 * we go to IDLE.
2007 */
2008 if (changed) {
2009 switch (log->l_covered_state) {
2010 case XLOG_STATE_COVER_IDLE:
2011 case XLOG_STATE_COVER_NEED:
2012 case XLOG_STATE_COVER_NEED2:
2013 log->l_covered_state = XLOG_STATE_COVER_NEED;
2014 break;
2015
2016 case XLOG_STATE_COVER_DONE:
2017 if (changed == 1)
2018 log->l_covered_state = XLOG_STATE_COVER_NEED2;
2019 else
2020 log->l_covered_state = XLOG_STATE_COVER_NEED;
2021 break;
2022
2023 case XLOG_STATE_COVER_DONE2:
2024 if (changed == 1)
2025 log->l_covered_state = XLOG_STATE_COVER_IDLE;
2026 else
2027 log->l_covered_state = XLOG_STATE_COVER_NEED;
2028 break;
2029
2030 default:
2031 ASSERT(0);
2032 }
2033 }
2034} /* xlog_state_clean_log */
2035
2036STATIC xfs_lsn_t
2037xlog_get_lowest_lsn(
2038 xlog_t *log)
2039{
2040 xlog_in_core_t *lsn_log;
2041 xfs_lsn_t lowest_lsn, lsn;
2042
2043 lsn_log = log->l_iclog;
2044 lowest_lsn = 0;
2045 do {
2046 if (!(lsn_log->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY))) {
2047 lsn = INT_GET(lsn_log->ic_header.h_lsn, ARCH_CONVERT);
2048 if ((lsn && !lowest_lsn) ||
2049 (XFS_LSN_CMP(lsn, lowest_lsn) < 0)) {
2050 lowest_lsn = lsn;
2051 }
2052 }
2053 lsn_log = lsn_log->ic_next;
2054 } while (lsn_log != log->l_iclog);
014c2544 2055 return lowest_lsn;
1da177e4
LT		 2056}
2057
2058
2059STATIC void
2060xlog_state_do_callback(
2061 xlog_t *log,
2062 int aborted,
2063 xlog_in_core_t *ciclog)
2064{
2065 xlog_in_core_t *iclog;
2066 xlog_in_core_t *first_iclog; /* used to know when we've
2067 * processed all iclogs once */
2068 xfs_log_callback_t *cb, *cb_next;
2069 int flushcnt = 0;
2070 xfs_lsn_t lowest_lsn;
2071 int ioerrors; /* counter: iclogs with errors */
2072 int loopdidcallbacks; /* flag: inner loop did callbacks*/
2073 int funcdidcallbacks; /* flag: function did callbacks */
2074 int repeats; /* for issuing console warnings if
2075 * looping too many times */
2076 SPLDECL(s);
2077
2078 s = LOG_LOCK(log);
2079 first_iclog = iclog = log->l_iclog;
2080 ioerrors = 0;
2081 funcdidcallbacks = 0;
2082 repeats = 0;
2083
2084 do {
2085 /*
2086 * Scan all iclogs starting with the one pointed to by the
2087 * log. Reset this starting point each time the log is
2088 * unlocked (during callbacks).
2089 *
2090 * Keep looping through iclogs until one full pass is made
2091 * without running any callbacks.
2092 */
2093 first_iclog = log->l_iclog;
2094 iclog = log->l_iclog;
2095 loopdidcallbacks = 0;
2096 repeats++;
2097
2098 do {
2099
2100 /* skip all iclogs in the ACTIVE & DIRTY states */
2101 if (iclog->ic_state &
2102 (XLOG_STATE_ACTIVE|XLOG_STATE_DIRTY)) {
2103 iclog = iclog->ic_next;
2104 continue;
2105 }
2106
2107 /*
2108 * Between marking a filesystem SHUTDOWN and stopping
2109 * the log, we do flush all iclogs to disk (if there
2110 * wasn't a log I/O error). So, we do want things to
2111 * go smoothly in case of just a SHUTDOWN w/o a
2112 * LOG_IO_ERROR.
2113 */
2114 if (!(iclog->ic_state & XLOG_STATE_IOERROR)) {
2115 /*
2116 * Can only perform callbacks in order. Since
2117 * this iclog is not in the DONE_SYNC/
2118 * DO_CALLBACK state, we skip the rest and
2119 * just try to clean up. If we set our iclog
2120 * to DO_CALLBACK, we will not process it when
2121 * we retry since a previous iclog is in the
2122 * CALLBACK and the state cannot change since
2123 * we are holding the LOG_LOCK.
2124 */
2125 if (!(iclog->ic_state &
2126 (XLOG_STATE_DONE_SYNC |
2127 XLOG_STATE_DO_CALLBACK))) {
2128 if (ciclog && (ciclog->ic_state ==
2129 XLOG_STATE_DONE_SYNC)) {
2130 ciclog->ic_state = XLOG_STATE_DO_CALLBACK;
2131 }
2132 break;
2133 }
2134 /*
2135 * We now have an iclog that is in either the
2136 * DO_CALLBACK or DONE_SYNC states. The other
2137 * states (WANT_SYNC, SYNCING, or CALLBACK were
2138 * caught by the above if and are going to
2139 * clean (i.e. we aren't doing their callbacks)
2140 * see the above if.
2141 */
2142
2143 /*
2144 * We will do one more check here to see if we
2145 * have chased our tail around.
2146 */
2147
2148 lowest_lsn = xlog_get_lowest_lsn(log);
2149 if (lowest_lsn && (
2150 XFS_LSN_CMP(
2151 lowest_lsn,
2152 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT)
2153 )<0)) {
2154 iclog = iclog->ic_next;
2155 continue; /* Leave this iclog for
2156 * another thread */
2157 }
2158
2159 iclog->ic_state = XLOG_STATE_CALLBACK;
2160
2161 LOG_UNLOCK(log, s);
2162
2163 /* l_last_sync_lsn field protected by
2164 * GRANT_LOCK. Don't worry about iclog's lsn.
2165 * No one else can be here except us.
2166 */
2167 s = GRANT_LOCK(log);
2168 ASSERT(XFS_LSN_CMP(
2169 log->l_last_sync_lsn,
2170 INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT)
2171 )<=0);
2172 log->l_last_sync_lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT);
2173 GRANT_UNLOCK(log, s);
2174
2175 /*
2176 * Keep processing entries in the callback list
2177 * until we come around and it is empty. We
2178 * need to atomically see that the list is
2179 * empty and change the state to DIRTY so that
2180 * we don't miss any more callbacks being added.
2181 */
2182 s = LOG_LOCK(log);
2183 } else {
2184 ioerrors++;
2185 }
2186 cb = iclog->ic_callback;
2187
2188 while (cb != 0) {
2189 iclog->ic_callback_tail = &(iclog->ic_callback);
2190 iclog->ic_callback = NULL;
2191 LOG_UNLOCK(log, s);
2192
2193 /* perform callbacks in the order given */
2194 for (; cb != 0; cb = cb_next) {
2195 cb_next = cb->cb_next;
2196 cb->cb_func(cb->cb_arg, aborted);
2197 }
2198 s = LOG_LOCK(log);
2199 cb = iclog->ic_callback;
2200 }
2201
2202 loopdidcallbacks++;
2203 funcdidcallbacks++;
2204
2205 ASSERT(iclog->ic_callback == 0);
2206 if (!(iclog->ic_state & XLOG_STATE_IOERROR))
2207 iclog->ic_state = XLOG_STATE_DIRTY;
2208
2209 /*
2210 * Transition from DIRTY to ACTIVE if applicable.
2211 * NOP if STATE_IOERROR.
2212 */
2213 xlog_state_clean_log(log);
2214
2215 /* wake up threads waiting in xfs_log_force() */
2216 sv_broadcast(&iclog->ic_forcesema);
2217
2218 iclog = iclog->ic_next;
2219 } while (first_iclog != iclog);
a3c6685e
NS		 2220
2221 if (repeats > 5000) {
2222 flushcnt += repeats;
2223 repeats = 0;
1da177e4 2224 xfs_fs_cmn_err(CE_WARN, log->l_mp,
a3c6685e
NS		 2225 "%s: possible infinite loop (%d iterations)",
2226 __FUNCTION__, flushcnt);
1da177e4
LT		 2227 }
2228 } while (!ioerrors && loopdidcallbacks);
2229
2230 /*
2231 * make one last gasp attempt to see if iclogs are being left in
2232 * limbo..
2233 */
2234#ifdef DEBUG
2235 if (funcdidcallbacks) {
2236 first_iclog = iclog = log->l_iclog;
2237 do {
2238 ASSERT(iclog->ic_state != XLOG_STATE_DO_CALLBACK);
2239 /*
2240 * Terminate the loop if iclogs are found in states
2241 * which will cause other threads to clean up iclogs.
2242 *
2243 * SYNCING - i/o completion will go through logs
2244 * DONE_SYNC - interrupt thread should be waiting for
2245 * LOG_LOCK
2246 * IOERROR - give up hope all ye who enter here
2247 */
2248 if (iclog->ic_state == XLOG_STATE_WANT_SYNC ||
2249 iclog->ic_state == XLOG_STATE_SYNCING ||
2250 iclog->ic_state == XLOG_STATE_DONE_SYNC ||
2251 iclog->ic_state == XLOG_STATE_IOERROR )
2252 break;
2253 iclog = iclog->ic_next;
2254 } while (first_iclog != iclog);
2255 }
2256#endif
2257
a3c6685e 2258 flushcnt = 0;
1da177e4
LT		 2259 if (log->l_iclog->ic_state & (XLOG_STATE_ACTIVE|XLOG_STATE_IOERROR)) {
2260 flushcnt = log->l_flushcnt;
2261 log->l_flushcnt = 0;
2262 }
2263 LOG_UNLOCK(log, s);
2264 while (flushcnt--)
2265 vsema(&log->l_flushsema);
2266} /* xlog_state_do_callback */
2267
2268
2269/*
2270 * Finish transitioning this iclog to the dirty state.
2271 *
2272 * Make sure that we completely execute this routine only when this is
2273 * the last call to the iclog. There is a good chance that iclog flushes,
2274 * when we reach the end of the physical log, get turned into 2 separate
2275 * calls to bwrite. Hence, one iclog flush could generate two calls to this
2276 * routine. By using the reference count bwritecnt, we guarantee that only
2277 * the second completion goes through.
2278 *
2279 * Callbacks could take time, so they are done outside the scope of the
2280 * global state machine log lock. Assume that the calls to cvsema won't
2281 * take a long time. At least we know it won't sleep.
2282 */
2283void
2284xlog_state_done_syncing(
2285 xlog_in_core_t *iclog,
2286 int aborted)
2287{
2288 xlog_t *log = iclog->ic_log;
2289 SPLDECL(s);
2290
2291 s = LOG_LOCK(log);
2292
2293 ASSERT(iclog->ic_state == XLOG_STATE_SYNCING ||
2294 iclog->ic_state == XLOG_STATE_IOERROR);
2295 ASSERT(iclog->ic_refcnt == 0);
2296 ASSERT(iclog->ic_bwritecnt == 1 || iclog->ic_bwritecnt == 2);
2297
2298
2299 /*
2300 * If we got an error, either on the first buffer, or in the case of
2301 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR,
2302 * and none should ever be attempted to be written to disk
2303 * again.
2304 */
2305 if (iclog->ic_state != XLOG_STATE_IOERROR) {
2306 if (--iclog->ic_bwritecnt == 1) {
2307 LOG_UNLOCK(log, s);
2308 return;
2309 }
2310 iclog->ic_state = XLOG_STATE_DONE_SYNC;
2311 }
2312
2313 /*
2314 * Someone could be sleeping prior to writing out the next
2315 * iclog buffer, we wake them all, one will get to do the
2316 * I/O, the others get to wait for the result.
2317 */
2318 sv_broadcast(&iclog->ic_writesema);
2319 LOG_UNLOCK(log, s);
2320 xlog_state_do_callback(log, aborted, iclog); /* also cleans log */
2321} /* xlog_state_done_syncing */
2322
2323
2324/*
2325 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must
2326 * sleep. The flush semaphore is set to the number of in-core buffers and
2327 * decremented around disk syncing. Therefore, if all buffers are syncing,
2328 * this semaphore will cause new writes to sleep until a sync completes.
2329 * Otherwise, this code just does p() followed by v(). This approximates
2330 * a sleep/wakeup except we can't race.
2331 *
2332 * The in-core logs are used in a circular fashion. They are not used
2333 * out-of-order even when an iclog past the head is free.
2334 *
2335 * return:
2336 * * log_offset where xlog_write() can start writing into the in-core
2337 * log's data space.
2338 * * in-core log pointer to which xlog_write() should write.
2339 * * boolean indicating this is a continued write to an in-core log.
2340 * If this is the last write, then the in-core log's offset field
2341 * needs to be incremented, depending on the amount of data which
2342 * is copied.
2343 */
2344int
2345xlog_state_get_iclog_space(xlog_t *log,
2346 int len,
2347 xlog_in_core_t **iclogp,
2348 xlog_ticket_t *ticket,
2349 int *continued_write,
2350 int *logoffsetp)
2351{
2352 SPLDECL(s);
2353 int log_offset;
2354 xlog_rec_header_t *head;
2355 xlog_in_core_t *iclog;
2356 int error;
2357
2358restart:
2359 s = LOG_LOCK(log);
2360 if (XLOG_FORCED_SHUTDOWN(log)) {
2361 LOG_UNLOCK(log, s);
2362 return XFS_ERROR(EIO);
2363 }
2364
2365 iclog = log->l_iclog;
2366 if (! (iclog->ic_state == XLOG_STATE_ACTIVE)) {
2367 log->l_flushcnt++;
2368 LOG_UNLOCK(log, s);
2369 xlog_trace_iclog(iclog, XLOG_TRACE_SLEEP_FLUSH);
2370 XFS_STATS_INC(xs_log_noiclogs);
2371 /* Ensure that log writes happen */
2372 psema(&log->l_flushsema, PINOD);
2373 goto restart;
2374 }
2375 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
2376 head = &iclog->ic_header;
2377
2378 iclog->ic_refcnt++; /* prevents sync */
2379 log_offset = iclog->ic_offset;
2380
2381 /* On the 1st write to an iclog, figure out lsn. This works
2382 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are
2383 * committing to. If the offset is set, that's how many blocks
2384 * must be written.
2385 */
2386 if (log_offset == 0) {
2387 ticket->t_curr_res -= log->l_iclog_hsize;
7e9c6396
TS		 2388 XLOG_TIC_ADD_REGION(ticket,
2389 log->l_iclog_hsize,
2390 XLOG_REG_TYPE_LRHEADER);
1da177e4
LT		 2391 INT_SET(head->h_cycle, ARCH_CONVERT, log->l_curr_cycle);
2392 ASSIGN_LSN(head->h_lsn, log);
2393 ASSERT(log->l_curr_block >= 0);
2394 }
2395
2396 /* If there is enough room to write everything, then do it. Otherwise,
2397 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC
2398 * bit is on, so this will get flushed out. Don't update ic_offset
2399 * until you know exactly how many bytes get copied. Therefore, wait
2400 * until later to update ic_offset.
2401 *
2402 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's
2403 * can fit into remaining data section.
2404 */
2405 if (iclog->ic_size - iclog->ic_offset < 2*sizeof(xlog_op_header_t)) {
2406 xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
2407
2408 /* If I'm the only one writing to this iclog, sync it to disk */
2409 if (iclog->ic_refcnt == 1) {
2410 LOG_UNLOCK(log, s);
2411 if ((error = xlog_state_release_iclog(log, iclog)))
014c2544 2412 return error;
1da177e4
LT		 2413 } else {
2414 iclog->ic_refcnt--;
2415 LOG_UNLOCK(log, s);
2416 }
2417 goto restart;
2418 }
2419
2420 /* Do we have enough room to write the full amount in the remainder
2421 * of this iclog? Or must we continue a write on the next iclog and
2422 * mark this iclog as completely taken? In the case where we switch
2423 * iclogs (to mark it taken), this particular iclog will release/sync
2424 * to disk in xlog_write().
2425 */
2426 if (len <= iclog->ic_size - iclog->ic_offset) {
2427 *continued_write = 0;
2428 iclog->ic_offset += len;
2429 } else {
2430 *continued_write = 1;
2431 xlog_state_switch_iclogs(log, iclog, iclog->ic_size);
2432 }
2433 *iclogp = iclog;
2434
2435 ASSERT(iclog->ic_offset <= iclog->ic_size);
2436 LOG_UNLOCK(log, s);
2437
2438 *logoffsetp = log_offset;
2439 return 0;
2440} /* xlog_state_get_iclog_space */
2441
2442/*
2443 * Atomically get the log space required for a log ticket.
2444 *
2445 * Once a ticket gets put onto the reserveq, it will only return after
2446 * the needed reservation is satisfied.
2447 */
2448STATIC int
2449xlog_grant_log_space(xlog_t *log,
2450 xlog_ticket_t *tic)
2451{
2452 int free_bytes;
2453 int need_bytes;
2454 SPLDECL(s);
2455#ifdef DEBUG
2456 xfs_lsn_t tail_lsn;
2457#endif
2458
2459
2460#ifdef DEBUG
2461 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
2462 panic("grant Recovery problem");
2463#endif
2464
2465 /* Is there space or do we need to sleep? */
2466 s = GRANT_LOCK(log);
2467 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: enter");
2468
2469 /* something is already sleeping; insert new transaction at end */
2470 if (log->l_reserve_headq) {
dd954c69 2471 xlog_ins_ticketq(&log->l_reserve_headq, tic);
1da177e4
LT		 2472 xlog_trace_loggrant(log, tic,
2473 "xlog_grant_log_space: sleep 1");
2474 /*
2475 * Gotta check this before going to sleep, while we're
2476 * holding the grant lock.
2477 */
2478 if (XLOG_FORCED_SHUTDOWN(log))
2479 goto error_return;
2480
2481 XFS_STATS_INC(xs_sleep_logspace);
2482 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s);
2483 /*
2484 * If we got an error, and the filesystem is shutting down,
2485 * we'll catch it down below. So just continue...
2486 */
2487 xlog_trace_loggrant(log, tic,
2488 "xlog_grant_log_space: wake 1");
2489 s = GRANT_LOCK(log);
2490 }
2491 if (tic->t_flags & XFS_LOG_PERM_RESERV)
2492 need_bytes = tic->t_unit_res*tic->t_ocnt;
2493 else
2494 need_bytes = tic->t_unit_res;
2495
2496redo:
2497 if (XLOG_FORCED_SHUTDOWN(log))
2498 goto error_return;
2499
2500 free_bytes = xlog_space_left(log, log->l_grant_reserve_cycle,
2501 log->l_grant_reserve_bytes);
2502 if (free_bytes < need_bytes) {
2503 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0)
dd954c69 2504 xlog_ins_ticketq(&log->l_reserve_headq, tic);
1da177e4
LT		 2505 xlog_trace_loggrant(log, tic,
2506 "xlog_grant_log_space: sleep 2");
2507 XFS_STATS_INC(xs_sleep_logspace);
2508 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s);
2509
2510 if (XLOG_FORCED_SHUTDOWN(log)) {
2511 s = GRANT_LOCK(log);
2512 goto error_return;
2513 }
2514
2515 xlog_trace_loggrant(log, tic,
2516 "xlog_grant_log_space: wake 2");
2517 xlog_grant_push_ail(log->l_mp, need_bytes);
2518 s = GRANT_LOCK(log);
2519 goto redo;
2520 } else if (tic->t_flags & XLOG_TIC_IN_Q)
dd954c69 2521 xlog_del_ticketq(&log->l_reserve_headq, tic);
1da177e4
LT		 2522
2523 /* we've got enough space */
dd954c69 2524 xlog_grant_add_space(log, need_bytes);
1da177e4
LT		 2525#ifdef DEBUG
2526 tail_lsn = log->l_tail_lsn;
2527 /*
2528 * Check to make sure the grant write head didn't just over lap the
2529 * tail. If the cycles are the same, we can't be overlapping.
2530 * Otherwise, make sure that the cycles differ by exactly one and
2531 * check the byte count.
2532 */
2533 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) {
2534 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn));
2535 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn)));
2536 }
2537#endif
2538 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: exit");
2539 xlog_verify_grant_head(log, 1);
2540 GRANT_UNLOCK(log, s);
2541 return 0;
2542
2543 error_return:
2544 if (tic->t_flags & XLOG_TIC_IN_Q)
dd954c69 2545 xlog_del_ticketq(&log->l_reserve_headq, tic);
1da177e4
LT		 2546 xlog_trace_loggrant(log, tic, "xlog_grant_log_space: err_ret");
2547 /*
2548 * If we are failing, make sure the ticket doesn't have any
2549 * current reservations. We don't want to add this back when
2550 * the ticket/transaction gets cancelled.
2551 */
2552 tic->t_curr_res = 0;
2553 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
2554 GRANT_UNLOCK(log, s);
2555 return XFS_ERROR(EIO);
2556} /* xlog_grant_log_space */
2557
2558
2559/*
2560 * Replenish the byte reservation required by moving the grant write head.
2561 *
2562 *
2563 */
2564STATIC int
2565xlog_regrant_write_log_space(xlog_t *log,
2566 xlog_ticket_t *tic)
2567{
2568 SPLDECL(s);
2569 int free_bytes, need_bytes;
2570 xlog_ticket_t *ntic;
2571#ifdef DEBUG
2572 xfs_lsn_t tail_lsn;
2573#endif
2574
2575 tic->t_curr_res = tic->t_unit_res;
7e9c6396 2576 XLOG_TIC_RESET_RES(tic);
1da177e4
LT		 2577
2578 if (tic->t_cnt > 0)
014c2544 2579 return 0;
1da177e4
LT		 2580
2581#ifdef DEBUG
2582 if (log->l_flags & XLOG_ACTIVE_RECOVERY)
2583 panic("regrant Recovery problem");
2584#endif
2585
2586 s = GRANT_LOCK(log);
2587 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: enter");
2588
2589 if (XLOG_FORCED_SHUTDOWN(log))
2590 goto error_return;
2591
2592 /* If there are other waiters on the queue then give them a
2593 * chance at logspace before us. Wake up the first waiters,
2594 * if we do not wake up all the waiters then go to sleep waiting
2595 * for more free space, otherwise try to get some space for
2596 * this transaction.
2597 */
2598
2599 if ((ntic = log->l_write_headq)) {
2600 free_bytes = xlog_space_left(log, log->l_grant_write_cycle,
2601 log->l_grant_write_bytes);
2602 do {
2603 ASSERT(ntic->t_flags & XLOG_TIC_PERM_RESERV);
2604
2605 if (free_bytes < ntic->t_unit_res)
2606 break;
2607 free_bytes -= ntic->t_unit_res;
2608 sv_signal(&ntic->t_sema);
2609 ntic = ntic->t_next;
2610 } while (ntic != log->l_write_headq);
2611
2612 if (ntic != log->l_write_headq) {
2613 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0)
dd954c69 2614 xlog_ins_ticketq(&log->l_write_headq, tic);
1da177e4
LT		 2615
2616 xlog_trace_loggrant(log, tic,
2617 "xlog_regrant_write_log_space: sleep 1");
2618 XFS_STATS_INC(xs_sleep_logspace);
2619 sv_wait(&tic->t_sema, PINOD|PLTWAIT,
2620 &log->l_grant_lock, s);
2621
2622 /* If we're shutting down, this tic is already
2623 * off the queue */
2624 if (XLOG_FORCED_SHUTDOWN(log)) {
2625 s = GRANT_LOCK(log);
2626 goto error_return;
2627 }
2628
2629 xlog_trace_loggrant(log, tic,
2630 "xlog_regrant_write_log_space: wake 1");
2631 xlog_grant_push_ail(log->l_mp, tic->t_unit_res);
2632 s = GRANT_LOCK(log);
2633 }
2634 }
2635
2636 need_bytes = tic->t_unit_res;
2637
2638redo:
2639 if (XLOG_FORCED_SHUTDOWN(log))
2640 goto error_return;
2641
2642 free_bytes = xlog_space_left(log, log->l_grant_write_cycle,
2643 log->l_grant_write_bytes);
2644 if (free_bytes < need_bytes) {
2645 if ((tic->t_flags & XLOG_TIC_IN_Q) == 0)
dd954c69 2646 xlog_ins_ticketq(&log->l_write_headq, tic);
1da177e4
LT		 2647 XFS_STATS_INC(xs_sleep_logspace);
2648 sv_wait(&tic->t_sema, PINOD|PLTWAIT, &log->l_grant_lock, s);
2649
2650 /* If we're shutting down, this tic is already off the queue */
2651 if (XLOG_FORCED_SHUTDOWN(log)) {
2652 s = GRANT_LOCK(log);
2653 goto error_return;
2654 }
2655
2656 xlog_trace_loggrant(log, tic,
2657 "xlog_regrant_write_log_space: wake 2");
2658 xlog_grant_push_ail(log->l_mp, need_bytes);
2659 s = GRANT_LOCK(log);
2660 goto redo;
2661 } else if (tic->t_flags & XLOG_TIC_IN_Q)
dd954c69 2662 xlog_del_ticketq(&log->l_write_headq, tic);
1da177e4 2663
dd954c69
CH		 2664 /* we've got enough space */
2665 xlog_grant_add_space_write(log, need_bytes);
1da177e4
LT		 2666#ifdef DEBUG
2667 tail_lsn = log->l_tail_lsn;
2668 if (CYCLE_LSN(tail_lsn) != log->l_grant_write_cycle) {
2669 ASSERT(log->l_grant_write_cycle-1 == CYCLE_LSN(tail_lsn));
2670 ASSERT(log->l_grant_write_bytes <= BBTOB(BLOCK_LSN(tail_lsn)));
2671 }
2672#endif
2673
2674 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: exit");
2675 xlog_verify_grant_head(log, 1);
2676 GRANT_UNLOCK(log, s);
014c2544 2677 return 0;
1da177e4
LT		 2678
2679
2680 error_return:
2681 if (tic->t_flags & XLOG_TIC_IN_Q)
dd954c69 2682 xlog_del_ticketq(&log->l_reserve_headq, tic);
1da177e4
LT		 2683 xlog_trace_loggrant(log, tic, "xlog_regrant_write_log_space: err_ret");
2684 /*
2685 * If we are failing, make sure the ticket doesn't have any
2686 * current reservations. We don't want to add this back when
2687 * the ticket/transaction gets cancelled.
2688 */
2689 tic->t_curr_res = 0;
2690 tic->t_cnt = 0; /* ungrant will give back unit_res * t_cnt. */
2691 GRANT_UNLOCK(log, s);
2692 return XFS_ERROR(EIO);
2693} /* xlog_regrant_write_log_space */
2694
2695
2696/* The first cnt-1 times through here we don't need to
2697 * move the grant write head because the permanent
2698 * reservation has reserved cnt times the unit amount.
2699 * Release part of current permanent unit reservation and
2700 * reset current reservation to be one units worth. Also
2701 * move grant reservation head forward.
2702 */
2703STATIC void
2704xlog_regrant_reserve_log_space(xlog_t *log,
2705 xlog_ticket_t *ticket)
2706{
2707 SPLDECL(s);
2708
2709 xlog_trace_loggrant(log, ticket,
2710 "xlog_regrant_reserve_log_space: enter");
2711 if (ticket->t_cnt > 0)
2712 ticket->t_cnt--;
2713
2714 s = GRANT_LOCK(log);
dd954c69 2715 xlog_grant_sub_space(log, ticket->t_curr_res);
1da177e4 2716 ticket->t_curr_res = ticket->t_unit_res;
7e9c6396 2717 XLOG_TIC_RESET_RES(ticket);
1da177e4
LT		 2718 xlog_trace_loggrant(log, ticket,
2719 "xlog_regrant_reserve_log_space: sub current res");
2720 xlog_verify_grant_head(log, 1);
2721
2722 /* just return if we still have some of the pre-reserved space */
2723 if (ticket->t_cnt > 0) {
2724 GRANT_UNLOCK(log, s);
2725 return;
2726 }
2727
dd954c69 2728 xlog_grant_add_space_reserve(log, ticket->t_unit_res);
1da177e4
LT		 2729 xlog_trace_loggrant(log, ticket,
2730 "xlog_regrant_reserve_log_space: exit");
2731 xlog_verify_grant_head(log, 0);
2732 GRANT_UNLOCK(log, s);
2733 ticket->t_curr_res = ticket->t_unit_res;
7e9c6396 2734 XLOG_TIC_RESET_RES(ticket);
1da177e4
LT		 2735} /* xlog_regrant_reserve_log_space */
2736
2737
2738/*
2739 * Give back the space left from a reservation.
2740 *
2741 * All the information we need to make a correct determination of space left
2742 * is present. For non-permanent reservations, things are quite easy. The
2743 * count should have been decremented to zero. We only need to deal with the
2744 * space remaining in the current reservation part of the ticket. If the
2745 * ticket contains a permanent reservation, there may be left over space which
2746 * needs to be released. A count of N means that N-1 refills of the current
2747 * reservation can be done before we need to ask for more space. The first
2748 * one goes to fill up the first current reservation. Once we run out of
2749 * space, the count will stay at zero and the only space remaining will be
2750 * in the current reservation field.
2751 */
2752STATIC void
2753xlog_ungrant_log_space(xlog_t *log,
2754 xlog_ticket_t *ticket)
2755{
2756 SPLDECL(s);
2757
2758 if (ticket->t_cnt > 0)
2759 ticket->t_cnt--;
2760
2761 s = GRANT_LOCK(log);
2762 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: enter");
2763
dd954c69 2764 xlog_grant_sub_space(log, ticket->t_curr_res);
1da177e4
LT		 2765
2766 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: sub current");
2767
2768 /* If this is a permanent reservation ticket, we may be able to free
2769 * up more space based on the remaining count.
2770 */
2771 if (ticket->t_cnt > 0) {
2772 ASSERT(ticket->t_flags & XLOG_TIC_PERM_RESERV);
dd954c69 2773 xlog_grant_sub_space(log, ticket->t_unit_res*ticket->t_cnt);
1da177e4
LT		 2774 }
2775
2776 xlog_trace_loggrant(log, ticket, "xlog_ungrant_log_space: exit");
2777 xlog_verify_grant_head(log, 1);
2778 GRANT_UNLOCK(log, s);
2779 xfs_log_move_tail(log->l_mp, 1);
2780} /* xlog_ungrant_log_space */
2781
2782
2783/*
2784 * Atomically put back used ticket.
2785 */
2786void
2787xlog_state_put_ticket(xlog_t *log,
2788 xlog_ticket_t *tic)
2789{
2790 unsigned long s;
2791
2792 s = LOG_LOCK(log);
2793 xlog_ticket_put(log, tic);
2794 LOG_UNLOCK(log, s);
2795} /* xlog_state_put_ticket */
2796
2797/*
2798 * Flush iclog to disk if this is the last reference to the given iclog and
2799 * the WANT_SYNC bit is set.
2800 *
2801 * When this function is entered, the iclog is not necessarily in the
2802 * WANT_SYNC state. It may be sitting around waiting to get filled.
2803 *
2804 *
2805 */
2806int
2807xlog_state_release_iclog(xlog_t *log,
2808 xlog_in_core_t *iclog)
2809{
2810 SPLDECL(s);
2811 int sync = 0; /* do we sync? */
2812
2813 xlog_assign_tail_lsn(log->l_mp);
2814
2815 s = LOG_LOCK(log);
2816
2817 if (iclog->ic_state & XLOG_STATE_IOERROR) {
2818 LOG_UNLOCK(log, s);
2819 return XFS_ERROR(EIO);
2820 }
2821
2822 ASSERT(iclog->ic_refcnt > 0);
2823 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE ||
2824 iclog->ic_state == XLOG_STATE_WANT_SYNC);
2825
2826 if (--iclog->ic_refcnt == 0 &&
2827 iclog->ic_state == XLOG_STATE_WANT_SYNC) {
2828 sync++;
2829 iclog->ic_state = XLOG_STATE_SYNCING;
2830 INT_SET(iclog->ic_header.h_tail_lsn, ARCH_CONVERT, log->l_tail_lsn);
2831 xlog_verify_tail_lsn(log, iclog, log->l_tail_lsn);
2832 /* cycle incremented when incrementing curr_block */
2833 }
2834
2835 LOG_UNLOCK(log, s);
2836
2837 /*
2838 * We let the log lock go, so it's possible that we hit a log I/O
c41564b5 2839 * error or some other SHUTDOWN condition that marks the iclog
1da177e4
LT		 2840 * as XLOG_STATE_IOERROR before the bwrite. However, we know that
2841 * this iclog has consistent data, so we ignore IOERROR
2842 * flags after this point.
2843 */
2844 if (sync) {
2845 return xlog_sync(log, iclog);
2846 }
014c2544 2847 return 0;
1da177e4
LT		 2848
2849} /* xlog_state_release_iclog */
2850
2851
2852/*
2853 * This routine will mark the current iclog in the ring as WANT_SYNC
2854 * and move the current iclog pointer to the next iclog in the ring.
2855 * When this routine is called from xlog_state_get_iclog_space(), the
2856 * exact size of the iclog has not yet been determined. All we know is
2857 * that every data block. We have run out of space in this log record.
2858 */
2859STATIC void
2860xlog_state_switch_iclogs(xlog_t *log,
2861 xlog_in_core_t *iclog,
2862 int eventual_size)
2863{
2864 ASSERT(iclog->ic_state == XLOG_STATE_ACTIVE);
2865 if (!eventual_size)
2866 eventual_size = iclog->ic_offset;
2867 iclog->ic_state = XLOG_STATE_WANT_SYNC;
2868 INT_SET(iclog->ic_header.h_prev_block, ARCH_CONVERT, log->l_prev_block);
2869 log->l_prev_block = log->l_curr_block;
2870 log->l_prev_cycle = log->l_curr_cycle;
2871
2872 /* roll log?: ic_offset changed later */
2873 log->l_curr_block += BTOBB(eventual_size)+BTOBB(log->l_iclog_hsize);
2874
2875 /* Round up to next log-sunit */
2876 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) &&
2877 log->l_mp->m_sb.sb_logsunit > 1) {
2878 __uint32_t sunit_bb = BTOBB(log->l_mp->m_sb.sb_logsunit);
2879 log->l_curr_block = roundup(log->l_curr_block, sunit_bb);
2880 }
2881
2882 if (log->l_curr_block >= log->l_logBBsize) {
2883 log->l_curr_cycle++;
2884 if (log->l_curr_cycle == XLOG_HEADER_MAGIC_NUM)
2885 log->l_curr_cycle++;
2886 log->l_curr_block -= log->l_logBBsize;
2887 ASSERT(log->l_curr_block >= 0);
2888 }
2889 ASSERT(iclog == log->l_iclog);
2890 log->l_iclog = iclog->ic_next;
2891} /* xlog_state_switch_iclogs */
2892
2893
2894/*
2895 * Write out all data in the in-core log as of this exact moment in time.
2896 *
2897 * Data may be written to the in-core log during this call. However,
2898 * we don't guarantee this data will be written out. A change from past
2899 * implementation means this routine will *not* write out zero length LRs.
2900 *
2901 * Basically, we try and perform an intelligent scan of the in-core logs.
2902 * If we determine there is no flushable data, we just return. There is no
2903 * flushable data if:
2904 *
2905 * 1. the current iclog is active and has no data; the previous iclog
2906 * is in the active or dirty state.
2907 * 2. the current iclog is drity, and the previous iclog is in the
2908 * active or dirty state.
2909 *
2910 * We may sleep (call psema) if:
2911 *
2912 * 1. the current iclog is not in the active nor dirty state.
2913 * 2. the current iclog dirty, and the previous iclog is not in the
2914 * active nor dirty state.
2915 * 3. the current iclog is active, and there is another thread writing
2916 * to this particular iclog.
2917 * 4. a) the current iclog is active and has no other writers
2918 * b) when we return from flushing out this iclog, it is still
2919 * not in the active nor dirty state.
2920 */
2921STATIC int
f538d4da 2922xlog_state_sync_all(xlog_t *log, uint flags, int *log_flushed)
1da177e4
LT		 2923{
2924 xlog_in_core_t *iclog;
2925 xfs_lsn_t lsn;
2926 SPLDECL(s);
2927
2928 s = LOG_LOCK(log);
2929
2930 iclog = log->l_iclog;
2931 if (iclog->ic_state & XLOG_STATE_IOERROR) {
2932 LOG_UNLOCK(log, s);
2933 return XFS_ERROR(EIO);
2934 }
2935
2936 /* If the head iclog is not active nor dirty, we just attach
2937 * ourselves to the head and go to sleep.
2938 */
2939 if (iclog->ic_state == XLOG_STATE_ACTIVE ||
2940 iclog->ic_state == XLOG_STATE_DIRTY) {
2941 /*
2942 * If the head is dirty or (active and empty), then
2943 * we need to look at the previous iclog. If the previous
2944 * iclog is active or dirty we are done. There is nothing
2945 * to sync out. Otherwise, we attach ourselves to the
2946 * previous iclog and go to sleep.
2947 */
2948 if (iclog->ic_state == XLOG_STATE_DIRTY ||
2949 (iclog->ic_refcnt == 0 && iclog->ic_offset == 0)) {
2950 iclog = iclog->ic_prev;
2951 if (iclog->ic_state == XLOG_STATE_ACTIVE ||
2952 iclog->ic_state == XLOG_STATE_DIRTY)
2953 goto no_sleep;
2954 else
2955 goto maybe_sleep;
2956 } else {
2957 if (iclog->ic_refcnt == 0) {
2958 /* We are the only one with access to this
2959 * iclog. Flush it out now. There should
2960 * be a roundoff of zero to show that someone
2961 * has already taken care of the roundoff from
2962 * the previous sync.
2963 */
2964 iclog->ic_refcnt++;
2965 lsn = INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT);
2966 xlog_state_switch_iclogs(log, iclog, 0);
2967 LOG_UNLOCK(log, s);
2968
2969 if (xlog_state_release_iclog(log, iclog))
2970 return XFS_ERROR(EIO);
f538d4da 2971 *log_flushed = 1;
1da177e4
LT		 2972 s = LOG_LOCK(log);
2973 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) == lsn &&
2974 iclog->ic_state != XLOG_STATE_DIRTY)
2975 goto maybe_sleep;
2976 else
2977 goto no_sleep;
2978 } else {
2979 /* Someone else is writing to this iclog.
2980 * Use its call to flush out the data. However,
2981 * the other thread may not force out this LR,
2982 * so we mark it WANT_SYNC.
2983 */
2984 xlog_state_switch_iclogs(log, iclog, 0);
2985 goto maybe_sleep;
2986 }
2987 }
2988 }
2989
2990 /* By the time we come around again, the iclog could've been filled
2991 * which would give it another lsn. If we have a new lsn, just
2992 * return because the relevant data has been flushed.
2993 */
2994maybe_sleep:
2995 if (flags & XFS_LOG_SYNC) {
2996 /*
2997 * We must check if we're shutting down here, before
2998 * we wait, while we're holding the LOG_LOCK.
2999 * Then we check again after waking up, in case our
3000 * sleep was disturbed by a bad news.
3001 */
3002 if (iclog->ic_state & XLOG_STATE_IOERROR) {
3003 LOG_UNLOCK(log, s);
3004 return XFS_ERROR(EIO);
3005 }
3006 XFS_STATS_INC(xs_log_force_sleep);
3007 sv_wait(&iclog->ic_forcesema, PINOD, &log->l_icloglock, s);
3008 /*
3009 * No need to grab the log lock here since we're
3010 * only deciding whether or not to return EIO
3011 * and the memory read should be atomic.
3012 */
3013 if (iclog->ic_state & XLOG_STATE_IOERROR)
3014 return XFS_ERROR(EIO);
f538d4da 3015 *log_flushed = 1;
1da177e4
LT		 3016
3017 } else {
3018
3019no_sleep:
3020 LOG_UNLOCK(log, s);
3021 }
3022 return 0;
3023} /* xlog_state_sync_all */
3024
3025
3026/*
3027 * Used by code which implements synchronous log forces.
3028 *
3029 * Find in-core log with lsn.
3030 * If it is in the DIRTY state, just return.
3031 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC
3032 * state and go to sleep or return.
3033 * If it is in any other state, go to sleep or return.
3034 *
3035 * If filesystem activity goes to zero, the iclog will get flushed only by
3036 * bdflush().
3037 */
3038int
3039xlog_state_sync(xlog_t *log,
3040 xfs_lsn_t lsn,
f538d4da
CH		 3041 uint flags,
3042 int *log_flushed)
1da177e4
LT		 3043{
3044 xlog_in_core_t *iclog;
3045 int already_slept = 0;
3046 SPLDECL(s);
3047
3048
3049try_again:
3050 s = LOG_LOCK(log);
3051 iclog = log->l_iclog;
3052
3053 if (iclog->ic_state & XLOG_STATE_IOERROR) {
3054 LOG_UNLOCK(log, s);
3055 return XFS_ERROR(EIO);
3056 }
3057
3058 do {
3059 if (INT_GET(iclog->ic_header.h_lsn, ARCH_CONVERT) != lsn) {
3060 iclog = iclog->ic_next;
3061 continue;
3062 }
3063
3064 if (iclog->ic_state == XLOG_STATE_DIRTY) {
3065 LOG_UNLOCK(log, s);
3066 return 0;
3067 }
3068
3069 if (iclog->ic_state == XLOG_STATE_ACTIVE) {
3070 /*
3071 * We sleep here if we haven't already slept (e.g.
3072 * this is the first time we've looked at the correct
3073 * iclog buf) and the buffer before us is going to
3074 * be sync'ed. The reason for this is that if we
3075 * are doing sync transactions here, by waiting for
3076 * the previous I/O to complete, we can allow a few
3077 * more transactions into this iclog before we close
3078 * it down.
3079 *
3080 * Otherwise, we mark the buffer WANT_SYNC, and bump
3081 * up the refcnt so we can release the log (which drops
3082 * the ref count). The state switch keeps new transaction
3083 * commits from using this buffer. When the current commits
3084 * finish writing into the buffer, the refcount will drop to
3085 * zero and the buffer will go out then.
3086 */
3087 if (!already_slept &&
3088 (iclog->ic_prev->ic_state & (XLOG_STATE_WANT_SYNC |
3089 XLOG_STATE_SYNCING))) {
3090 ASSERT(!(iclog->ic_state & XLOG_STATE_IOERROR));
3091 XFS_STATS_INC(xs_log_force_sleep);
3092 sv_wait(&iclog->ic_prev->ic_writesema, PSWP,
3093 &log->l_icloglock, s);
f538d4da 3094 *log_flushed = 1;
1da177e4
LT		 3095 already_slept = 1;
3096 goto try_again;
3097 } else {
3098 iclog->ic_refcnt++;
3099 xlog_state_switch_iclogs(log, iclog, 0);
3100 LOG_UNLOCK(log, s);
3101 if (xlog_state_release_iclog(log, iclog))
3102 return XFS_ERROR(EIO);
f538d4da 3103 *log_flushed = 1;
1da177e4
LT		 3104 s = LOG_LOCK(log);
3105 }
3106 }
3107
3108 if ((flags & XFS_LOG_SYNC) && /* sleep */
3109 !(iclog->ic_state & (XLOG_STATE_ACTIVE | XLOG_STATE_DIRTY))) {
3110
3111 /*
3112 * Don't wait on the forcesema if we know that we've
3113 * gotten a log write error.
3114 */
3115 if (iclog->ic_state & XLOG_STATE_IOERROR) {
3116 LOG_UNLOCK(log, s);
3117 return XFS_ERROR(EIO);
3118 }
3119 XFS_STATS_INC(xs_log_force_sleep);
3120 sv_wait(&iclog->ic_forcesema, PSWP, &log->l_icloglock, s);
3121 /*
3122 * No need to grab the log lock here since we're
3123 * only deciding whether or not to return EIO
3124 * and the memory read should be atomic.
3125 */
3126 if (iclog->ic_state & XLOG_STATE_IOERROR)
3127 return XFS_ERROR(EIO);
f538d4da 3128 *log_flushed = 1;
1da177e4
LT		 3129 } else { /* just return */
3130 LOG_UNLOCK(log, s);
3131 }
3132 return 0;
3133
3134 } while (iclog != log->l_iclog);
3135
3136 LOG_UNLOCK(log, s);
014c2544 3137 return 0;
1da177e4
LT		 3138} /* xlog_state_sync */
3139
3140
3141/*
3142 * Called when we want to mark the current iclog as being ready to sync to
3143 * disk.
3144 */
3145void
3146xlog_state_want_sync(xlog_t *log, xlog_in_core_t *iclog)
3147{
3148 SPLDECL(s);
3149
3150 s = LOG_LOCK(log);
3151
3152 if (iclog->ic_state == XLOG_STATE_ACTIVE) {
3153 xlog_state_switch_iclogs(log, iclog, 0);
3154 } else {
3155 ASSERT(iclog->ic_state &
3156 (XLOG_STATE_WANT_SYNC|XLOG_STATE_IOERROR));
3157 }
3158
3159 LOG_UNLOCK(log, s);
3160} /* xlog_state_want_sync */
3161
3162
3163
3164/*****************************************************************************
3165 *
3166 * TICKET functions
3167 *
3168 *****************************************************************************
3169 */
3170
3171/*
3172 * Algorithm doesn't take into account page size. ;-(
3173 */
3174STATIC void
3175xlog_state_ticket_alloc(xlog_t *log)
3176{
3177 xlog_ticket_t *t_list;
3178 xlog_ticket_t *next;
3179 xfs_caddr_t buf;
3180 uint i = (NBPP / sizeof(xlog_ticket_t)) - 2;
3181 SPLDECL(s);
3182
3183 /*
3184 * The kmem_zalloc may sleep, so we shouldn't be holding the
3185 * global lock. XXXmiken: may want to use zone allocator.
3186 */
3187 buf = (xfs_caddr_t) kmem_zalloc(NBPP, KM_SLEEP);
3188
3189 s = LOG_LOCK(log);
3190
3191 /* Attach 1st ticket to Q, so we can keep track of allocated memory */
3192 t_list = (xlog_ticket_t *)buf;
3193 t_list->t_next = log->l_unmount_free;
3194 log->l_unmount_free = t_list++;
3195 log->l_ticket_cnt++;
3196 log->l_ticket_tcnt++;
3197
3198 /* Next ticket becomes first ticket attached to ticket free list */
3199 if (log->l_freelist != NULL) {
3200 ASSERT(log->l_tail != NULL);
3201 log->l_tail->t_next = t_list;
3202 } else {
3203 log->l_freelist = t_list;
3204 }
3205 log->l_ticket_cnt++;
3206 log->l_ticket_tcnt++;
3207
3208 /* Cycle through rest of alloc'ed memory, building up free Q */
3209 for ( ; i > 0; i--) {
3210 next = t_list + 1;
3211 t_list->t_next = next;
3212 t_list = next;
3213 log->l_ticket_cnt++;
3214 log->l_ticket_tcnt++;
3215 }
3216 t_list->t_next = NULL;
3217 log->l_tail = t_list;
3218 LOG_UNLOCK(log, s);
3219} /* xlog_state_ticket_alloc */
3220
3221
3222/*
3223 * Put ticket into free list
3224 *
3225 * Assumption: log lock is held around this call.
3226 */
3227STATIC void
3228xlog_ticket_put(xlog_t *log,
3229 xlog_ticket_t *ticket)
3230{
3231 sv_destroy(&ticket->t_sema);
3232
3233 /*
3234 * Don't think caching will make that much difference. It's
3235 * more important to make debug easier.
3236 */
3237#if 0
3238 /* real code will want to use LIFO for caching */
3239 ticket->t_next = log->l_freelist;
3240 log->l_freelist = ticket;
3241 /* no need to clear fields */
3242#else
3243 /* When we debug, it is easier if tickets are cycled */
3244 ticket->t_next = NULL;
3245 if (log->l_tail != 0) {
3246 log->l_tail->t_next = ticket;
3247 } else {
3248 ASSERT(log->l_freelist == 0);
3249 log->l_freelist = ticket;
3250 }
3251 log->l_tail = ticket;
3252#endif /* DEBUG */
3253 log->l_ticket_cnt++;
3254} /* xlog_ticket_put */
3255
3256
3257/*
3258 * Grab ticket off freelist or allocation some more
3259 */
3260xlog_ticket_t *
3261xlog_ticket_get(xlog_t *log,
3262 int unit_bytes,
3263 int cnt,
3264 char client,
3265 uint xflags)
3266{
3267 xlog_ticket_t *tic;
3268 uint num_headers;
3269 SPLDECL(s);
3270
3271 alloc:
3272 if (log->l_freelist == NULL)
3273 xlog_state_ticket_alloc(log); /* potentially sleep */
3274
3275 s = LOG_LOCK(log);
3276 if (log->l_freelist == NULL) {
3277 LOG_UNLOCK(log, s);
3278 goto alloc;
3279 }
3280 tic = log->l_freelist;
3281 log->l_freelist = tic->t_next;
3282 if (log->l_freelist == NULL)
3283 log->l_tail = NULL;
3284 log->l_ticket_cnt--;
3285 LOG_UNLOCK(log, s);
3286
3287 /*
3288 * Permanent reservations have up to 'cnt'-1 active log operations
3289 * in the log. A unit in this case is the amount of space for one
3290 * of these log operations. Normal reservations have a cnt of 1
3291 * and their unit amount is the total amount of space required.
3292 *
3293 * The following lines of code account for non-transaction data
32fb9b57
TS		 3294 * which occupy space in the on-disk log.
3295 *
3296 * Normal form of a transaction is:
3297 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph>
3298 * and then there are LR hdrs, split-recs and roundoff at end of syncs.
3299 *
3300 * We need to account for all the leadup data and trailer data
3301 * around the transaction data.
3302 * And then we need to account for the worst case in terms of using
3303 * more space.
3304 * The worst case will happen if:
3305 * - the placement of the transaction happens to be such that the
3306 * roundoff is at its maximum
3307 * - the transaction data is synced before the commit record is synced
3308 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff>
3309 * Therefore the commit record is in its own Log Record.
3310 * This can happen as the commit record is called with its
3311 * own region to xlog_write().
3312 * This then means that in the worst case, roundoff can happen for
3313 * the commit-rec as well.
3314 * The commit-rec is smaller than padding in this scenario and so it is
3315 * not added separately.
1da177e4
LT		 3316 */
3317
32fb9b57
TS		 3318 /* for trans header */
3319 unit_bytes += sizeof(xlog_op_header_t);
3320 unit_bytes += sizeof(xfs_trans_header_t);
3321
1da177e4 3322 /* for start-rec */
32fb9b57
TS		 3323 unit_bytes += sizeof(xlog_op_header_t);
3324
3325 /* for LR headers */
3326 num_headers = ((unit_bytes + log->l_iclog_size-1) >> log->l_iclog_size_log);
3327 unit_bytes += log->l_iclog_hsize * num_headers;
1da177e4 3328
32fb9b57
TS		 3329 /* for commit-rec LR header - note: padding will subsume the ophdr */
3330 unit_bytes += log->l_iclog_hsize;
3331
3332 /* for split-recs - ophdrs added when data split over LRs */
3333 unit_bytes += sizeof(xlog_op_header_t) * num_headers;
3334
3335 /* for roundoff padding for transaction data and one for commit record */
1da177e4 3336 if (XFS_SB_VERSION_HASLOGV2(&log->l_mp->m_sb) &&
32fb9b57 3337 log->l_mp->m_sb.sb_logsunit > 1) {
1da177e4 3338 /* log su roundoff */
32fb9b57 3339 unit_bytes += 2*log->l_mp->m_sb.sb_logsunit;
1da177e4
LT		 3340 } else {
3341 /* BB roundoff */
32fb9b57 3342 unit_bytes += 2*BBSIZE;
1da177e4
LT		 3343 }
3344
1da177e4
LT		 3345 tic->t_unit_res = unit_bytes;
3346 tic->t_curr_res = unit_bytes;
3347 tic->t_cnt = cnt;
3348 tic->t_ocnt = cnt;
3349 tic->t_tid = (xlog_tid_t)((__psint_t)tic & 0xffffffff);
3350 tic->t_clientid = client;
3351 tic->t_flags = XLOG_TIC_INITED;
7e9c6396 3352 tic->t_trans_type = 0;
1da177e4
LT		 3353 if (xflags & XFS_LOG_PERM_RESERV)
3354 tic->t_flags |= XLOG_TIC_PERM_RESERV;
3355 sv_init(&(tic->t_sema), SV_DEFAULT, "logtick");
3356
7e9c6396
TS		 3357 XLOG_TIC_RESET_RES(tic);
3358
1da177e4
LT		 3359 return tic;
3360} /* xlog_ticket_get */
3361
3362
3363/******************************************************************************
3364 *
3365 * Log debug routines
3366 *
3367 ******************************************************************************
3368 */
cfcbbbd0 3369#if defined(DEBUG)
1da177e4
LT		 3370/*
3371 * Make sure that the destination ptr is within the valid data region of
3372 * one of the iclogs. This uses backup pointers stored in a different
3373 * part of the log in case we trash the log structure.
3374 */
3375void
3376xlog_verify_dest_ptr(xlog_t *log,
3377 __psint_t ptr)
3378{
3379 int i;
3380 int good_ptr = 0;
3381
3382 for (i=0; i < log->l_iclog_bufs; i++) {
3383 if (ptr >= (__psint_t)log->l_iclog_bak[i] &&
3384 ptr <= (__psint_t)log->l_iclog_bak[i]+log->l_iclog_size)
3385 good_ptr++;
3386 }
3387 if (! good_ptr)
3388 xlog_panic("xlog_verify_dest_ptr: invalid ptr");
3389} /* xlog_verify_dest_ptr */
3390
3391STATIC void
3392xlog_verify_grant_head(xlog_t *log, int equals)
3393{
3394 if (log->l_grant_reserve_cycle == log->l_grant_write_cycle) {
3395 if (equals)
3396 ASSERT(log->l_grant_reserve_bytes >= log->l_grant_write_bytes);
3397 else
3398 ASSERT(log->l_grant_reserve_bytes > log->l_grant_write_bytes);
3399 } else {
3400 ASSERT(log->l_grant_reserve_cycle-1 == log->l_grant_write_cycle);
3401 ASSERT(log->l_grant_write_bytes >= log->l_grant_reserve_bytes);
3402 }
3403} /* xlog_verify_grant_head */
3404
3405/* check if it will fit */
3406STATIC void
3407xlog_verify_tail_lsn(xlog_t *log,
3408 xlog_in_core_t *iclog,
3409 xfs_lsn_t tail_lsn)
3410{
3411 int blocks;
3412
3413 if (CYCLE_LSN(tail_lsn) == log->l_prev_cycle) {
3414 blocks =
3415 log->l_logBBsize - (log->l_prev_block - BLOCK_LSN(tail_lsn));
3416 if (blocks < BTOBB(iclog->ic_offset)+BTOBB(log->l_iclog_hsize))
3417 xlog_panic("xlog_verify_tail_lsn: ran out of log space");
3418 } else {
3419 ASSERT(CYCLE_LSN(tail_lsn)+1 == log->l_prev_cycle);
3420
3421 if (BLOCK_LSN(tail_lsn) == log->l_prev_block)
3422 xlog_panic("xlog_verify_tail_lsn: tail wrapped");
3423
3424 blocks = BLOCK_LSN(tail_lsn) - log->l_prev_block;
3425 if (blocks < BTOBB(iclog->ic_offset) + 1)
3426 xlog_panic("xlog_verify_tail_lsn: ran out of log space");
3427 }
3428} /* xlog_verify_tail_lsn */
3429
3430/*
3431 * Perform a number of checks on the iclog before writing to disk.
3432 *
3433 * 1. Make sure the iclogs are still circular
3434 * 2. Make sure we have a good magic number
3435 * 3. Make sure we don't have magic numbers in the data
3436 * 4. Check fields of each log operation header for:
3437 * A. Valid client identifier
3438 * B. tid ptr value falls in valid ptr space (user space code)
3439 * C. Length in log record header is correct according to the
3440 * individual operation headers within record.
3441 * 5. When a bwrite will occur within 5 blocks of the front of the physical
3442 * log, check the preceding blocks of the physical log to make sure all
3443 * the cycle numbers agree with the current cycle number.
3444 */
3445STATIC void
3446xlog_verify_iclog(xlog_t *log,
3447 xlog_in_core_t *iclog,
3448 int count,
3449 boolean_t syncing)
3450{
3451 xlog_op_header_t *ophead;
3452 xlog_in_core_t *icptr;
3453 xlog_in_core_2_t *xhdr;
3454 xfs_caddr_t ptr;
3455 xfs_caddr_t base_ptr;
3456 __psint_t field_offset;
3457 __uint8_t clientid;
3458 int len, i, j, k, op_len;
3459 int idx;
3460 SPLDECL(s);
3461
3462 /* check validity of iclog pointers */
3463 s = LOG_LOCK(log);
3464 icptr = log->l_iclog;
3465 for (i=0; i < log->l_iclog_bufs; i++) {
3466 if (icptr == 0)
3467 xlog_panic("xlog_verify_iclog: invalid ptr");
3468 icptr = icptr->ic_next;
3469 }
3470 if (icptr != log->l_iclog)
3471 xlog_panic("xlog_verify_iclog: corrupt iclog ring");
3472 LOG_UNLOCK(log, s);
3473
3474 /* check log magic numbers */
3475 ptr = (xfs_caddr_t) &(iclog->ic_header);
3476 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) != XLOG_HEADER_MAGIC_NUM)
3477 xlog_panic("xlog_verify_iclog: invalid magic num");
3478
3479 for (ptr += BBSIZE; ptr < ((xfs_caddr_t)&(iclog->ic_header))+count;
3480 ptr += BBSIZE) {
3481 if (INT_GET(*(uint *)ptr, ARCH_CONVERT) == XLOG_HEADER_MAGIC_NUM)
3482 xlog_panic("xlog_verify_iclog: unexpected magic num");
3483 }
3484
3485 /* check fields */
3486 len = INT_GET(iclog->ic_header.h_num_logops, ARCH_CONVERT);
3487 ptr = iclog->ic_datap;
3488 base_ptr = ptr;
3489 ophead = (xlog_op_header_t *)ptr;
3490 xhdr = (xlog_in_core_2_t *)&iclog->ic_header;
3491 for (i = 0; i < len; i++) {
3492 ophead = (xlog_op_header_t *)ptr;
3493
3494 /* clientid is only 1 byte */
3495 field_offset = (__psint_t)
3496 ((xfs_caddr_t)&(ophead->oh_clientid) - base_ptr);
3497 if (syncing == B_FALSE || (field_offset & 0x1ff)) {
3498 clientid = ophead->oh_clientid;
3499 } else {
3500 idx = BTOBBT((xfs_caddr_t)&(ophead->oh_clientid) - iclog->ic_datap);
3501 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
3502 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3503 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3504 clientid = GET_CLIENT_ID(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT);
3505 } else {
3506 clientid = GET_CLIENT_ID(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT);
3507 }
3508 }
3509 if (clientid != XFS_TRANSACTION && clientid != XFS_LOG)
da1650a5
CH		 3510 cmn_err(CE_WARN, "xlog_verify_iclog: "
3511 "invalid clientid %d op 0x%p offset 0x%lx",
3512 clientid, ophead, (unsigned long)field_offset);
1da177e4
LT		 3513
3514 /* check length */
3515 field_offset = (__psint_t)
3516 ((xfs_caddr_t)&(ophead->oh_len) - base_ptr);
3517 if (syncing == B_FALSE || (field_offset & 0x1ff)) {
3518 op_len = INT_GET(ophead->oh_len, ARCH_CONVERT);
3519 } else {
3520 idx = BTOBBT((__psint_t)&ophead->oh_len -
3521 (__psint_t)iclog->ic_datap);
3522 if (idx >= (XLOG_HEADER_CYCLE_SIZE / BBSIZE)) {
3523 j = idx / (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3524 k = idx % (XLOG_HEADER_CYCLE_SIZE / BBSIZE);
3525 op_len = INT_GET(xhdr[j].hic_xheader.xh_cycle_data[k], ARCH_CONVERT);
3526 } else {
3527 op_len = INT_GET(iclog->ic_header.h_cycle_data[idx], ARCH_CONVERT);
3528 }
3529 }
3530 ptr += sizeof(xlog_op_header_t) + op_len;
3531 }
3532} /* xlog_verify_iclog */
cfcbbbd0 3533#endif
1da177e4
LT		 3534
3535/*
3536 * Mark all iclogs IOERROR. LOG_LOCK is held by the caller.
3537 */
3538STATIC int
3539xlog_state_ioerror(
3540 xlog_t *log)
3541{
3542 xlog_in_core_t *iclog, *ic;
3543
3544 iclog = log->l_iclog;
3545 if (! (iclog->ic_state & XLOG_STATE_IOERROR)) {
3546 /*
3547 * Mark all the incore logs IOERROR.
3548 * From now on, no log flushes will result.
3549 */
3550 ic = iclog;
3551 do {
3552 ic->ic_state = XLOG_STATE_IOERROR;
3553 ic = ic->ic_next;
3554 } while (ic != iclog);
014c2544 3555 return 0;
1da177e4
LT		 3556 }
3557 /*
3558 * Return non-zero, if state transition has already happened.
3559 */
014c2544 3560 return 1;
1da177e4
LT		 3561}
3562
3563/*
3564 * This is called from xfs_force_shutdown, when we're forcibly
3565 * shutting down the filesystem, typically because of an IO error.
3566 * Our main objectives here are to make sure that:
3567 * a. the filesystem gets marked 'SHUTDOWN' for all interested
3568 * parties to find out, 'atomically'.
3569 * b. those who're sleeping on log reservations, pinned objects and
3570 * other resources get woken up, and be told the bad news.
3571 * c. nothing new gets queued up after (a) and (b) are done.
3572 * d. if !logerror, flush the iclogs to disk, then seal them off
3573 * for business.
3574 */
3575int
3576xfs_log_force_umount(
3577 struct xfs_mount *mp,
3578 int logerror)
3579{
3580 xlog_ticket_t *tic;
3581 xlog_t *log;
3582 int retval;
f538d4da 3583 int dummy;
1da177e4
LT		 3584 SPLDECL(s);
3585 SPLDECL(s2);
3586
3587 log = mp->m_log;
3588
3589 /*
3590 * If this happens during log recovery, don't worry about
3591 * locking; the log isn't open for business yet.
3592 */
3593 if (!log ||
3594 log->l_flags & XLOG_ACTIVE_RECOVERY) {
3595 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
3596 XFS_BUF_DONE(mp->m_sb_bp);
014c2544 3597 return 0;
1da177e4
LT		 3598 }
3599
3600 /*
3601 * Somebody could've already done the hard work for us.
3602 * No need to get locks for this.
3603 */
3604 if (logerror && log->l_iclog->ic_state & XLOG_STATE_IOERROR) {
3605 ASSERT(XLOG_FORCED_SHUTDOWN(log));
014c2544 3606 return 1;
1da177e4
LT		 3607 }
3608 retval = 0;
3609 /*
3610 * We must hold both the GRANT lock and the LOG lock,
3611 * before we mark the filesystem SHUTDOWN and wake
3612 * everybody up to tell the bad news.
3613 */
3614 s = GRANT_LOCK(log);
3615 s2 = LOG_LOCK(log);
3616 mp->m_flags |= XFS_MOUNT_FS_SHUTDOWN;
3617 XFS_BUF_DONE(mp->m_sb_bp);
3618 /*
3619 * This flag is sort of redundant because of the mount flag, but
3620 * it's good to maintain the separation between the log and the rest
3621 * of XFS.
3622 */
3623 log->l_flags |= XLOG_IO_ERROR;
3624
3625 /*
3626 * If we hit a log error, we want to mark all the iclogs IOERROR
3627 * while we're still holding the loglock.
3628 */
3629 if (logerror)
3630 retval = xlog_state_ioerror(log);
3631 LOG_UNLOCK(log, s2);
3632
3633 /*
3634 * We don't want anybody waiting for log reservations
3635 * after this. That means we have to wake up everybody
3636 * queued up on reserve_headq as well as write_headq.
3637 * In addition, we make sure in xlog_{re}grant_log_space
3638 * that we don't enqueue anything once the SHUTDOWN flag
3639 * is set, and this action is protected by the GRANTLOCK.
3640 */
3641 if ((tic = log->l_reserve_headq)) {
3642 do {
3643 sv_signal(&tic->t_sema);
3644 tic = tic->t_next;
3645 } while (tic != log->l_reserve_headq);
3646 }
3647
3648 if ((tic = log->l_write_headq)) {
3649 do {
3650 sv_signal(&tic->t_sema);
3651 tic = tic->t_next;
3652 } while (tic != log->l_write_headq);
3653 }
3654 GRANT_UNLOCK(log, s);
3655
3656 if (! (log->l_iclog->ic_state & XLOG_STATE_IOERROR)) {
3657 ASSERT(!logerror);
3658 /*
3659 * Force the incore logs to disk before shutting the
3660 * log down completely.
3661 */
f538d4da 3662 xlog_state_sync_all(log, XFS_LOG_FORCE|XFS_LOG_SYNC, &dummy);
1da177e4
LT		 3663 s2 = LOG_LOCK(log);
3664 retval = xlog_state_ioerror(log);
3665 LOG_UNLOCK(log, s2);
3666 }
3667 /*
3668 * Wake up everybody waiting on xfs_log_force.
3669 * Callback all log item committed functions as if the
3670 * log writes were completed.
3671 */
3672 xlog_state_do_callback(log, XFS_LI_ABORTED, NULL);
3673
3674#ifdef XFSERRORDEBUG
3675 {
3676 xlog_in_core_t *iclog;
3677
3678 s = LOG_LOCK(log);
3679 iclog = log->l_iclog;
3680 do {
3681 ASSERT(iclog->ic_callback == 0);
3682 iclog = iclog->ic_next;
3683 } while (iclog != log->l_iclog);
3684 LOG_UNLOCK(log, s);
3685 }
3686#endif
3687 /* return non-zero if log IOERROR transition had already happened */
014c2544 3688 return retval;
1da177e4
LT		 3689}
3690
ba0f32d4 3691STATIC int
1da177e4
LT		 3692xlog_iclogs_empty(xlog_t *log)
3693{
3694 xlog_in_core_t *iclog;
3695
3696 iclog = log->l_iclog;
3697 do {
3698 /* endianness does not matter here, zero is zero in
3699 * any language.
3700 */
3701 if (iclog->ic_header.h_num_logops)
014c2544 3702 return 0;
1da177e4
LT		 3703 iclog = iclog->ic_next;
3704 } while (iclog != log->l_iclog);
014c2544 3705 return 1;
1da177e4 3706}
Linux 6.x block layer and io_uring tree(s)