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2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
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
7 * published by the Free Software Foundation.
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.
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
20 #include "xfs_types.h"
24 #include "xfs_trans.h"
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"
33 #include "xfs_bmap_btree.h"
34 #include "xfs_alloc_btree.h"
35 #include "xfs_ialloc_btree.h"
36 #include "xfs_log_recover.h"
37 #include "xfs_trans_priv.h"
38 #include "xfs_dir2_sf.h"
39 #include "xfs_attr_sf.h"
40 #include "xfs_dinode.h"
41 #include "xfs_inode.h"
43 #include "xfs_trace.h"
45 kmem_zone_t
*xfs_log_ticket_zone
;
47 /* Local miscellaneous function prototypes */
48 STATIC
int xlog_commit_record(struct log
*log
, struct xlog_ticket
*ticket
,
49 xlog_in_core_t
**, xfs_lsn_t
*);
50 STATIC xlog_t
* xlog_alloc_log(xfs_mount_t
*mp
,
51 xfs_buftarg_t
*log_target
,
52 xfs_daddr_t blk_offset
,
54 STATIC
int xlog_space_left(xlog_t
*log
, int cycle
, int bytes
);
55 STATIC
int xlog_sync(xlog_t
*log
, xlog_in_core_t
*iclog
);
56 STATIC
void xlog_dealloc_log(xlog_t
*log
);
57 STATIC
int xlog_write(struct log
*log
, struct xfs_log_vec
*log_vector
,
58 struct xlog_ticket
*tic
, xfs_lsn_t
*start_lsn
,
59 xlog_in_core_t
**commit_iclog
, uint flags
);
61 /* local state machine functions */
62 STATIC
void xlog_state_done_syncing(xlog_in_core_t
*iclog
, int);
63 STATIC
void xlog_state_do_callback(xlog_t
*log
,int aborted
, xlog_in_core_t
*iclog
);
64 STATIC
int xlog_state_get_iclog_space(xlog_t
*log
,
66 xlog_in_core_t
**iclog
,
67 xlog_ticket_t
*ticket
,
70 STATIC
int xlog_state_release_iclog(xlog_t
*log
,
71 xlog_in_core_t
*iclog
);
72 STATIC
void xlog_state_switch_iclogs(xlog_t
*log
,
73 xlog_in_core_t
*iclog
,
75 STATIC
void xlog_state_want_sync(xlog_t
*log
, xlog_in_core_t
*iclog
);
77 /* local functions to manipulate grant head */
78 STATIC
int xlog_grant_log_space(xlog_t
*log
,
80 STATIC
void xlog_grant_push_ail(xfs_mount_t
*mp
,
82 STATIC
void xlog_regrant_reserve_log_space(xlog_t
*log
,
83 xlog_ticket_t
*ticket
);
84 STATIC
int xlog_regrant_write_log_space(xlog_t
*log
,
85 xlog_ticket_t
*ticket
);
86 STATIC
void xlog_ungrant_log_space(xlog_t
*log
,
87 xlog_ticket_t
*ticket
);
90 /* local ticket functions */
91 STATIC xlog_ticket_t
*xlog_ticket_alloc(xlog_t
*log
,
98 STATIC
void xlog_verify_dest_ptr(xlog_t
*log
, char *ptr
);
99 STATIC
void xlog_verify_grant_head(xlog_t
*log
, int equals
);
100 STATIC
void xlog_verify_iclog(xlog_t
*log
, xlog_in_core_t
*iclog
,
101 int count
, boolean_t syncing
);
102 STATIC
void xlog_verify_tail_lsn(xlog_t
*log
, xlog_in_core_t
*iclog
,
105 #define xlog_verify_dest_ptr(a,b)
106 #define xlog_verify_grant_head(a,b)
107 #define xlog_verify_iclog(a,b,c,d)
108 #define xlog_verify_tail_lsn(a,b,c)
111 STATIC
int xlog_iclogs_empty(xlog_t
*log
);
115 xlog_ins_ticketq(struct xlog_ticket
**qp
, struct xlog_ticket
*tic
)
119 tic
->t_prev
= (*qp
)->t_prev
;
120 (*qp
)->t_prev
->t_next
= tic
;
123 tic
->t_prev
= tic
->t_next
= tic
;
127 tic
->t_flags
|= XLOG_TIC_IN_Q
;
131 xlog_del_ticketq(struct xlog_ticket
**qp
, struct xlog_ticket
*tic
)
133 if (tic
== tic
->t_next
) {
137 tic
->t_next
->t_prev
= tic
->t_prev
;
138 tic
->t_prev
->t_next
= tic
->t_next
;
141 tic
->t_next
= tic
->t_prev
= NULL
;
142 tic
->t_flags
&= ~XLOG_TIC_IN_Q
;
146 xlog_grant_sub_space(struct log
*log
, int bytes
)
148 log
->l_grant_write_bytes
-= bytes
;
149 if (log
->l_grant_write_bytes
< 0) {
150 log
->l_grant_write_bytes
+= log
->l_logsize
;
151 log
->l_grant_write_cycle
--;
154 log
->l_grant_reserve_bytes
-= bytes
;
155 if ((log
)->l_grant_reserve_bytes
< 0) {
156 log
->l_grant_reserve_bytes
+= log
->l_logsize
;
157 log
->l_grant_reserve_cycle
--;
163 xlog_grant_add_space_write(struct log
*log
, int bytes
)
165 int tmp
= log
->l_logsize
- log
->l_grant_write_bytes
;
167 log
->l_grant_write_bytes
+= bytes
;
169 log
->l_grant_write_cycle
++;
170 log
->l_grant_write_bytes
= bytes
- tmp
;
175 xlog_grant_add_space_reserve(struct log
*log
, int bytes
)
177 int tmp
= log
->l_logsize
- log
->l_grant_reserve_bytes
;
179 log
->l_grant_reserve_bytes
+= bytes
;
181 log
->l_grant_reserve_cycle
++;
182 log
->l_grant_reserve_bytes
= bytes
- tmp
;
187 xlog_grant_add_space(struct log
*log
, int bytes
)
189 xlog_grant_add_space_write(log
, bytes
);
190 xlog_grant_add_space_reserve(log
, bytes
);
194 xlog_tic_reset_res(xlog_ticket_t
*tic
)
197 tic
->t_res_arr_sum
= 0;
198 tic
->t_res_num_ophdrs
= 0;
202 xlog_tic_add_region(xlog_ticket_t
*tic
, uint len
, uint type
)
204 if (tic
->t_res_num
== XLOG_TIC_LEN_MAX
) {
205 /* add to overflow and start again */
206 tic
->t_res_o_flow
+= tic
->t_res_arr_sum
;
208 tic
->t_res_arr_sum
= 0;
211 tic
->t_res_arr
[tic
->t_res_num
].r_len
= len
;
212 tic
->t_res_arr
[tic
->t_res_num
].r_type
= type
;
213 tic
->t_res_arr_sum
+= len
;
220 * 1. currblock field gets updated at startup and after in-core logs
221 * marked as with WANT_SYNC.
225 * This routine is called when a user of a log manager ticket is done with
226 * the reservation. If the ticket was ever used, then a commit record for
227 * the associated transaction is written out as a log operation header with
228 * no data. The flag XLOG_TIC_INITED is set when the first write occurs with
229 * a given ticket. If the ticket was one with a permanent reservation, then
230 * a few operations are done differently. Permanent reservation tickets by
231 * default don't release the reservation. They just commit the current
232 * transaction with the belief that the reservation is still needed. A flag
233 * must be passed in before permanent reservations are actually released.
234 * When these type of tickets are not released, they need to be set into
235 * the inited state again. By doing this, a start record will be written
236 * out when the next write occurs.
240 struct xfs_mount
*mp
,
241 struct xlog_ticket
*ticket
,
242 struct xlog_in_core
**iclog
,
245 struct log
*log
= mp
->m_log
;
248 if (XLOG_FORCED_SHUTDOWN(log
) ||
250 * If nothing was ever written, don't write out commit record.
251 * If we get an error, just continue and give back the log ticket.
253 (((ticket
->t_flags
& XLOG_TIC_INITED
) == 0) &&
254 (xlog_commit_record(log
, ticket
, iclog
, &lsn
)))) {
255 lsn
= (xfs_lsn_t
) -1;
256 if (ticket
->t_flags
& XLOG_TIC_PERM_RESERV
) {
257 flags
|= XFS_LOG_REL_PERM_RESERV
;
262 if ((ticket
->t_flags
& XLOG_TIC_PERM_RESERV
) == 0 ||
263 (flags
& XFS_LOG_REL_PERM_RESERV
)) {
264 trace_xfs_log_done_nonperm(log
, ticket
);
267 * Release ticket if not permanent reservation or a specific
268 * request has been made to release a permanent reservation.
270 xlog_ungrant_log_space(log
, ticket
);
271 xfs_log_ticket_put(ticket
);
273 trace_xfs_log_done_perm(log
, ticket
);
275 xlog_regrant_reserve_log_space(log
, ticket
);
276 /* If this ticket was a permanent reservation and we aren't
277 * trying to release it, reset the inited flags; so next time
278 * we write, a start record will be written out.
280 ticket
->t_flags
|= XLOG_TIC_INITED
;
287 * Attaches a new iclog I/O completion callback routine during
288 * transaction commit. If the log is in error state, a non-zero
289 * return code is handed back and the caller is responsible for
290 * executing the callback at an appropriate time.
294 struct xfs_mount
*mp
,
295 struct xlog_in_core
*iclog
,
296 xfs_log_callback_t
*cb
)
300 spin_lock(&iclog
->ic_callback_lock
);
301 abortflg
= (iclog
->ic_state
& XLOG_STATE_IOERROR
);
303 ASSERT_ALWAYS((iclog
->ic_state
== XLOG_STATE_ACTIVE
) ||
304 (iclog
->ic_state
== XLOG_STATE_WANT_SYNC
));
306 *(iclog
->ic_callback_tail
) = cb
;
307 iclog
->ic_callback_tail
= &(cb
->cb_next
);
309 spin_unlock(&iclog
->ic_callback_lock
);
314 xfs_log_release_iclog(
315 struct xfs_mount
*mp
,
316 struct xlog_in_core
*iclog
)
318 if (xlog_state_release_iclog(mp
->m_log
, iclog
)) {
319 xfs_force_shutdown(mp
, SHUTDOWN_LOG_IO_ERROR
);
327 * 1. Reserve an amount of on-disk log space and return a ticket corresponding
328 * to the reservation.
329 * 2. Potentially, push buffers at tail of log to disk.
331 * Each reservation is going to reserve extra space for a log record header.
332 * When writes happen to the on-disk log, we don't subtract the length of the
333 * log record header from any reservation. By wasting space in each
334 * reservation, we prevent over allocation problems.
338 struct xfs_mount
*mp
,
341 struct xlog_ticket
**ticket
,
346 struct log
*log
= mp
->m_log
;
347 struct xlog_ticket
*internal_ticket
;
350 ASSERT(client
== XFS_TRANSACTION
|| client
== XFS_LOG
);
351 ASSERT((flags
& XFS_LOG_NOSLEEP
) == 0);
353 if (XLOG_FORCED_SHUTDOWN(log
))
354 return XFS_ERROR(EIO
);
356 XFS_STATS_INC(xs_try_logspace
);
359 if (*ticket
!= NULL
) {
360 ASSERT(flags
& XFS_LOG_PERM_RESERV
);
361 internal_ticket
= *ticket
;
363 trace_xfs_log_reserve(log
, internal_ticket
);
365 xlog_grant_push_ail(mp
, internal_ticket
->t_unit_res
);
366 retval
= xlog_regrant_write_log_space(log
, internal_ticket
);
368 /* may sleep if need to allocate more tickets */
369 internal_ticket
= xlog_ticket_alloc(log
, unit_bytes
, cnt
,
371 if (!internal_ticket
)
372 return XFS_ERROR(ENOMEM
);
373 internal_ticket
->t_trans_type
= t_type
;
374 *ticket
= internal_ticket
;
376 trace_xfs_log_reserve(log
, internal_ticket
);
378 xlog_grant_push_ail(mp
,
379 (internal_ticket
->t_unit_res
*
380 internal_ticket
->t_cnt
));
381 retval
= xlog_grant_log_space(log
, internal_ticket
);
385 } /* xfs_log_reserve */
389 * Mount a log filesystem
391 * mp - ubiquitous xfs mount point structure
392 * log_target - buftarg of on-disk log device
393 * blk_offset - Start block # where block size is 512 bytes (BBSIZE)
394 * num_bblocks - Number of BBSIZE blocks in on-disk log
396 * Return error or zero.
401 xfs_buftarg_t
*log_target
,
402 xfs_daddr_t blk_offset
,
407 if (!(mp
->m_flags
& XFS_MOUNT_NORECOVERY
))
408 cmn_err(CE_NOTE
, "XFS mounting filesystem %s", mp
->m_fsname
);
411 "!Mounting filesystem \"%s\" in no-recovery mode. Filesystem will be inconsistent.",
413 ASSERT(mp
->m_flags
& XFS_MOUNT_RDONLY
);
416 mp
->m_log
= xlog_alloc_log(mp
, log_target
, blk_offset
, num_bblks
);
417 if (IS_ERR(mp
->m_log
)) {
418 error
= -PTR_ERR(mp
->m_log
);
423 * Initialize the AIL now we have a log.
425 error
= xfs_trans_ail_init(mp
);
427 cmn_err(CE_WARN
, "XFS: AIL initialisation failed: error %d", error
);
430 mp
->m_log
->l_ailp
= mp
->m_ail
;
433 * skip log recovery on a norecovery mount. pretend it all
436 if (!(mp
->m_flags
& XFS_MOUNT_NORECOVERY
)) {
437 int readonly
= (mp
->m_flags
& XFS_MOUNT_RDONLY
);
440 mp
->m_flags
&= ~XFS_MOUNT_RDONLY
;
442 error
= xlog_recover(mp
->m_log
);
445 mp
->m_flags
|= XFS_MOUNT_RDONLY
;
447 cmn_err(CE_WARN
, "XFS: log mount/recovery failed: error %d", error
);
448 goto out_destroy_ail
;
452 /* Normal transactions can now occur */
453 mp
->m_log
->l_flags
&= ~XLOG_ACTIVE_RECOVERY
;
458 xfs_trans_ail_destroy(mp
);
460 xlog_dealloc_log(mp
->m_log
);
466 * Finish the recovery of the file system. This is separate from
467 * the xfs_log_mount() call, because it depends on the code in
468 * xfs_mountfs() to read in the root and real-time bitmap inodes
469 * between calling xfs_log_mount() and here.
471 * mp - ubiquitous xfs mount point structure
474 xfs_log_mount_finish(xfs_mount_t
*mp
)
478 if (!(mp
->m_flags
& XFS_MOUNT_NORECOVERY
))
479 error
= xlog_recover_finish(mp
->m_log
);
482 ASSERT(mp
->m_flags
& XFS_MOUNT_RDONLY
);
489 * Final log writes as part of unmount.
491 * Mark the filesystem clean as unmount happens. Note that during relocation
492 * this routine needs to be executed as part of source-bag while the
493 * deallocation must not be done until source-end.
497 * Unmount record used to have a string "Unmount filesystem--" in the
498 * data section where the "Un" was really a magic number (XLOG_UNMOUNT_TYPE).
499 * We just write the magic number now since that particular field isn't
500 * currently architecture converted and "nUmount" is a bit foo.
501 * As far as I know, there weren't any dependencies on the old behaviour.
505 xfs_log_unmount_write(xfs_mount_t
*mp
)
507 xlog_t
*log
= mp
->m_log
;
508 xlog_in_core_t
*iclog
;
510 xlog_in_core_t
*first_iclog
;
512 xlog_ticket_t
*tic
= NULL
;
517 * Don't write out unmount record on read-only mounts.
518 * Or, if we are doing a forced umount (typically because of IO errors).
520 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
523 error
= _xfs_log_force(mp
, XFS_LOG_SYNC
, NULL
);
524 ASSERT(error
|| !(XLOG_FORCED_SHUTDOWN(log
)));
527 first_iclog
= iclog
= log
->l_iclog
;
529 if (!(iclog
->ic_state
& XLOG_STATE_IOERROR
)) {
530 ASSERT(iclog
->ic_state
& XLOG_STATE_ACTIVE
);
531 ASSERT(iclog
->ic_offset
== 0);
533 iclog
= iclog
->ic_next
;
534 } while (iclog
!= first_iclog
);
536 if (! (XLOG_FORCED_SHUTDOWN(log
))) {
537 error
= xfs_log_reserve(mp
, 600, 1, &tic
,
538 XFS_LOG
, 0, XLOG_UNMOUNT_REC_TYPE
);
540 /* the data section must be 32 bit size aligned */
544 __uint32_t pad2
; /* may as well make it 64 bits */
546 .magic
= XLOG_UNMOUNT_TYPE
,
548 struct xfs_log_iovec reg
= {
549 .i_addr
= (void *)&magic
,
550 .i_len
= sizeof(magic
),
551 .i_type
= XLOG_REG_TYPE_UNMOUNT
,
553 struct xfs_log_vec vec
= {
558 /* remove inited flag */
560 error
= xlog_write(log
, &vec
, tic
, &lsn
,
561 NULL
, XLOG_UNMOUNT_TRANS
);
563 * At this point, we're umounting anyway,
564 * so there's no point in transitioning log state
565 * to IOERROR. Just continue...
570 xfs_fs_cmn_err(CE_ALERT
, mp
,
571 "xfs_log_unmount: unmount record failed");
575 spin_lock(&log
->l_icloglock
);
576 iclog
= log
->l_iclog
;
577 atomic_inc(&iclog
->ic_refcnt
);
578 xlog_state_want_sync(log
, iclog
);
579 spin_unlock(&log
->l_icloglock
);
580 error
= xlog_state_release_iclog(log
, iclog
);
582 spin_lock(&log
->l_icloglock
);
583 if (!(iclog
->ic_state
== XLOG_STATE_ACTIVE
||
584 iclog
->ic_state
== XLOG_STATE_DIRTY
)) {
585 if (!XLOG_FORCED_SHUTDOWN(log
)) {
586 sv_wait(&iclog
->ic_force_wait
, PMEM
,
587 &log
->l_icloglock
, s
);
589 spin_unlock(&log
->l_icloglock
);
592 spin_unlock(&log
->l_icloglock
);
595 trace_xfs_log_umount_write(log
, tic
);
596 xlog_ungrant_log_space(log
, tic
);
597 xfs_log_ticket_put(tic
);
601 * We're already in forced_shutdown mode, couldn't
602 * even attempt to write out the unmount transaction.
604 * Go through the motions of sync'ing and releasing
605 * the iclog, even though no I/O will actually happen,
606 * we need to wait for other log I/Os that may already
607 * be in progress. Do this as a separate section of
608 * code so we'll know if we ever get stuck here that
609 * we're in this odd situation of trying to unmount
610 * a file system that went into forced_shutdown as
611 * the result of an unmount..
613 spin_lock(&log
->l_icloglock
);
614 iclog
= log
->l_iclog
;
615 atomic_inc(&iclog
->ic_refcnt
);
617 xlog_state_want_sync(log
, iclog
);
618 spin_unlock(&log
->l_icloglock
);
619 error
= xlog_state_release_iclog(log
, iclog
);
621 spin_lock(&log
->l_icloglock
);
623 if ( ! ( iclog
->ic_state
== XLOG_STATE_ACTIVE
624 || iclog
->ic_state
== XLOG_STATE_DIRTY
625 || iclog
->ic_state
== XLOG_STATE_IOERROR
) ) {
627 sv_wait(&iclog
->ic_force_wait
, PMEM
,
628 &log
->l_icloglock
, s
);
630 spin_unlock(&log
->l_icloglock
);
635 } /* xfs_log_unmount_write */
638 * Deallocate log structures for unmount/relocation.
640 * We need to stop the aild from running before we destroy
641 * and deallocate the log as the aild references the log.
644 xfs_log_unmount(xfs_mount_t
*mp
)
646 xfs_trans_ail_destroy(mp
);
647 xlog_dealloc_log(mp
->m_log
);
652 struct xfs_mount
*mp
,
653 struct xfs_log_item
*item
,
655 struct xfs_item_ops
*ops
)
657 item
->li_mountp
= mp
;
658 item
->li_ailp
= mp
->m_ail
;
659 item
->li_type
= type
;
664 * Write region vectors to log. The write happens using the space reservation
665 * of the ticket (tic). It is not a requirement that all writes for a given
666 * transaction occur with one call to xfs_log_write(). However, it is important
667 * to note that the transaction reservation code makes an assumption about the
668 * number of log headers a transaction requires that may be violated if you
669 * don't pass all the transaction vectors in one call....
673 struct xfs_mount
*mp
,
674 struct xfs_log_iovec reg
[],
676 struct xlog_ticket
*tic
,
677 xfs_lsn_t
*start_lsn
)
679 struct log
*log
= mp
->m_log
;
681 struct xfs_log_vec vec
= {
682 .lv_niovecs
= nentries
,
686 if (XLOG_FORCED_SHUTDOWN(log
))
687 return XFS_ERROR(EIO
);
689 error
= xlog_write(log
, &vec
, tic
, start_lsn
, NULL
, 0);
691 xfs_force_shutdown(mp
, SHUTDOWN_LOG_IO_ERROR
);
696 xfs_log_move_tail(xfs_mount_t
*mp
,
700 xlog_t
*log
= mp
->m_log
;
701 int need_bytes
, free_bytes
, cycle
, bytes
;
703 if (XLOG_FORCED_SHUTDOWN(log
))
707 /* needed since sync_lsn is 64 bits */
708 spin_lock(&log
->l_icloglock
);
709 tail_lsn
= log
->l_last_sync_lsn
;
710 spin_unlock(&log
->l_icloglock
);
713 spin_lock(&log
->l_grant_lock
);
715 /* Also an invalid lsn. 1 implies that we aren't passing in a valid
719 log
->l_tail_lsn
= tail_lsn
;
722 if ((tic
= log
->l_write_headq
)) {
724 if (log
->l_flags
& XLOG_ACTIVE_RECOVERY
)
725 panic("Recovery problem");
727 cycle
= log
->l_grant_write_cycle
;
728 bytes
= log
->l_grant_write_bytes
;
729 free_bytes
= xlog_space_left(log
, cycle
, bytes
);
731 ASSERT(tic
->t_flags
& XLOG_TIC_PERM_RESERV
);
733 if (free_bytes
< tic
->t_unit_res
&& tail_lsn
!= 1)
736 free_bytes
-= tic
->t_unit_res
;
737 sv_signal(&tic
->t_wait
);
739 } while (tic
!= log
->l_write_headq
);
741 if ((tic
= log
->l_reserve_headq
)) {
743 if (log
->l_flags
& XLOG_ACTIVE_RECOVERY
)
744 panic("Recovery problem");
746 cycle
= log
->l_grant_reserve_cycle
;
747 bytes
= log
->l_grant_reserve_bytes
;
748 free_bytes
= xlog_space_left(log
, cycle
, bytes
);
750 if (tic
->t_flags
& XLOG_TIC_PERM_RESERV
)
751 need_bytes
= tic
->t_unit_res
*tic
->t_cnt
;
753 need_bytes
= tic
->t_unit_res
;
754 if (free_bytes
< need_bytes
&& tail_lsn
!= 1)
757 free_bytes
-= need_bytes
;
758 sv_signal(&tic
->t_wait
);
760 } while (tic
!= log
->l_reserve_headq
);
762 spin_unlock(&log
->l_grant_lock
);
763 } /* xfs_log_move_tail */
766 * Determine if we have a transaction that has gone to disk
767 * that needs to be covered. To begin the transition to the idle state
768 * firstly the log needs to be idle (no AIL and nothing in the iclogs).
769 * If we are then in a state where covering is needed, the caller is informed
770 * that dummy transactions are required to move the log into the idle state.
772 * Because this is called as part of the sync process, we should also indicate
773 * that dummy transactions should be issued in anything but the covered or
774 * idle states. This ensures that the log tail is accurately reflected in
775 * the log at the end of the sync, hence if a crash occurrs avoids replay
776 * of transactions where the metadata is already on disk.
779 xfs_log_need_covered(xfs_mount_t
*mp
)
782 xlog_t
*log
= mp
->m_log
;
784 if (!xfs_fs_writable(mp
))
787 spin_lock(&log
->l_icloglock
);
788 switch (log
->l_covered_state
) {
789 case XLOG_STATE_COVER_DONE
:
790 case XLOG_STATE_COVER_DONE2
:
791 case XLOG_STATE_COVER_IDLE
:
793 case XLOG_STATE_COVER_NEED
:
794 case XLOG_STATE_COVER_NEED2
:
795 if (!xfs_trans_ail_tail(log
->l_ailp
) &&
796 xlog_iclogs_empty(log
)) {
797 if (log
->l_covered_state
== XLOG_STATE_COVER_NEED
)
798 log
->l_covered_state
= XLOG_STATE_COVER_DONE
;
800 log
->l_covered_state
= XLOG_STATE_COVER_DONE2
;
807 spin_unlock(&log
->l_icloglock
);
811 /******************************************************************************
815 ******************************************************************************
818 /* xfs_trans_tail_ail returns 0 when there is nothing in the list.
819 * The log manager must keep track of the last LR which was committed
820 * to disk. The lsn of this LR will become the new tail_lsn whenever
821 * xfs_trans_tail_ail returns 0. If we don't do this, we run into
822 * the situation where stuff could be written into the log but nothing
823 * was ever in the AIL when asked. Eventually, we panic since the
824 * tail hits the head.
826 * We may be holding the log iclog lock upon entering this routine.
829 xlog_assign_tail_lsn(xfs_mount_t
*mp
)
832 xlog_t
*log
= mp
->m_log
;
834 tail_lsn
= xfs_trans_ail_tail(mp
->m_ail
);
835 spin_lock(&log
->l_grant_lock
);
837 log
->l_tail_lsn
= tail_lsn
;
839 tail_lsn
= log
->l_tail_lsn
= log
->l_last_sync_lsn
;
841 spin_unlock(&log
->l_grant_lock
);
844 } /* xlog_assign_tail_lsn */
848 * Return the space in the log between the tail and the head. The head
849 * is passed in the cycle/bytes formal parms. In the special case where
850 * the reserve head has wrapped passed the tail, this calculation is no
851 * longer valid. In this case, just return 0 which means there is no space
852 * in the log. This works for all places where this function is called
853 * with the reserve head. Of course, if the write head were to ever
854 * wrap the tail, we should blow up. Rather than catch this case here,
855 * we depend on other ASSERTions in other parts of the code. XXXmiken
857 * This code also handles the case where the reservation head is behind
858 * the tail. The details of this case are described below, but the end
859 * result is that we return the size of the log as the amount of space left.
862 xlog_space_left(xlog_t
*log
, int cycle
, int bytes
)
868 tail_bytes
= BBTOB(BLOCK_LSN(log
->l_tail_lsn
));
869 tail_cycle
= CYCLE_LSN(log
->l_tail_lsn
);
870 if ((tail_cycle
== cycle
) && (bytes
>= tail_bytes
)) {
871 free_bytes
= log
->l_logsize
- (bytes
- tail_bytes
);
872 } else if ((tail_cycle
+ 1) < cycle
) {
874 } else if (tail_cycle
< cycle
) {
875 ASSERT(tail_cycle
== (cycle
- 1));
876 free_bytes
= tail_bytes
- bytes
;
879 * The reservation head is behind the tail.
880 * In this case we just want to return the size of the
881 * log as the amount of space left.
883 xfs_fs_cmn_err(CE_ALERT
, log
->l_mp
,
884 "xlog_space_left: head behind tail\n"
885 " tail_cycle = %d, tail_bytes = %d\n"
886 " GH cycle = %d, GH bytes = %d",
887 tail_cycle
, tail_bytes
, cycle
, bytes
);
889 free_bytes
= log
->l_logsize
;
892 } /* xlog_space_left */
896 * Log function which is called when an io completes.
898 * The log manager needs its own routine, in order to control what
899 * happens with the buffer after the write completes.
902 xlog_iodone(xfs_buf_t
*bp
)
904 xlog_in_core_t
*iclog
;
908 iclog
= XFS_BUF_FSPRIVATE(bp
, xlog_in_core_t
*);
909 ASSERT(XFS_BUF_FSPRIVATE2(bp
, unsigned long) == (unsigned long) 2);
910 XFS_BUF_SET_FSPRIVATE2(bp
, (unsigned long)1);
915 * If the _XFS_BARRIER_FAILED flag was set by a lower
916 * layer, it means the underlying device no longer supports
917 * barrier I/O. Warn loudly and turn off barriers.
919 if (bp
->b_flags
& _XFS_BARRIER_FAILED
) {
920 bp
->b_flags
&= ~_XFS_BARRIER_FAILED
;
921 l
->l_mp
->m_flags
&= ~XFS_MOUNT_BARRIER
;
922 xfs_fs_cmn_err(CE_WARN
, l
->l_mp
,
923 "xlog_iodone: Barriers are no longer supported"
924 " by device. Disabling barriers\n");
928 * Race to shutdown the filesystem if we see an error.
930 if (XFS_TEST_ERROR((XFS_BUF_GETERROR(bp
)), l
->l_mp
,
931 XFS_ERRTAG_IODONE_IOERR
, XFS_RANDOM_IODONE_IOERR
)) {
932 xfs_ioerror_alert("xlog_iodone", l
->l_mp
, bp
, XFS_BUF_ADDR(bp
));
934 xfs_force_shutdown(l
->l_mp
, SHUTDOWN_LOG_IO_ERROR
);
936 * This flag will be propagated to the trans-committed
937 * callback routines to let them know that the log-commit
940 aborted
= XFS_LI_ABORTED
;
941 } else if (iclog
->ic_state
& XLOG_STATE_IOERROR
) {
942 aborted
= XFS_LI_ABORTED
;
945 /* log I/O is always issued ASYNC */
946 ASSERT(XFS_BUF_ISASYNC(bp
));
947 xlog_state_done_syncing(iclog
, aborted
);
949 * do not reference the buffer (bp) here as we could race
950 * with it being freed after writing the unmount record to the
957 * Return size of each in-core log record buffer.
959 * All machines get 8 x 32kB buffers by default, unless tuned otherwise.
961 * If the filesystem blocksize is too large, we may need to choose a
962 * larger size since the directory code currently logs entire blocks.
966 xlog_get_iclog_buffer_size(xfs_mount_t
*mp
,
972 if (mp
->m_logbufs
<= 0)
973 log
->l_iclog_bufs
= XLOG_MAX_ICLOGS
;
975 log
->l_iclog_bufs
= mp
->m_logbufs
;
978 * Buffer size passed in from mount system call.
980 if (mp
->m_logbsize
> 0) {
981 size
= log
->l_iclog_size
= mp
->m_logbsize
;
982 log
->l_iclog_size_log
= 0;
984 log
->l_iclog_size_log
++;
988 if (xfs_sb_version_haslogv2(&mp
->m_sb
)) {
989 /* # headers = size / 32k
990 * one header holds cycles from 32k of data
993 xhdrs
= mp
->m_logbsize
/ XLOG_HEADER_CYCLE_SIZE
;
994 if (mp
->m_logbsize
% XLOG_HEADER_CYCLE_SIZE
)
996 log
->l_iclog_hsize
= xhdrs
<< BBSHIFT
;
997 log
->l_iclog_heads
= xhdrs
;
999 ASSERT(mp
->m_logbsize
<= XLOG_BIG_RECORD_BSIZE
);
1000 log
->l_iclog_hsize
= BBSIZE
;
1001 log
->l_iclog_heads
= 1;
1006 /* All machines use 32kB buffers by default. */
1007 log
->l_iclog_size
= XLOG_BIG_RECORD_BSIZE
;
1008 log
->l_iclog_size_log
= XLOG_BIG_RECORD_BSHIFT
;
1010 /* the default log size is 16k or 32k which is one header sector */
1011 log
->l_iclog_hsize
= BBSIZE
;
1012 log
->l_iclog_heads
= 1;
1015 /* are we being asked to make the sizes selected above visible? */
1016 if (mp
->m_logbufs
== 0)
1017 mp
->m_logbufs
= log
->l_iclog_bufs
;
1018 if (mp
->m_logbsize
== 0)
1019 mp
->m_logbsize
= log
->l_iclog_size
;
1020 } /* xlog_get_iclog_buffer_size */
1024 * This routine initializes some of the log structure for a given mount point.
1025 * Its primary purpose is to fill in enough, so recovery can occur. However,
1026 * some other stuff may be filled in too.
1029 xlog_alloc_log(xfs_mount_t
*mp
,
1030 xfs_buftarg_t
*log_target
,
1031 xfs_daddr_t blk_offset
,
1035 xlog_rec_header_t
*head
;
1036 xlog_in_core_t
**iclogp
;
1037 xlog_in_core_t
*iclog
, *prev_iclog
=NULL
;
1043 log
= kmem_zalloc(sizeof(xlog_t
), KM_MAYFAIL
);
1045 xlog_warn("XFS: Log allocation failed: No memory!");
1050 log
->l_targ
= log_target
;
1051 log
->l_logsize
= BBTOB(num_bblks
);
1052 log
->l_logBBstart
= blk_offset
;
1053 log
->l_logBBsize
= num_bblks
;
1054 log
->l_covered_state
= XLOG_STATE_COVER_IDLE
;
1055 log
->l_flags
|= XLOG_ACTIVE_RECOVERY
;
1057 log
->l_prev_block
= -1;
1058 log
->l_tail_lsn
= xlog_assign_lsn(1, 0);
1059 /* log->l_tail_lsn = 0x100000000LL; cycle = 1; current block = 0 */
1060 log
->l_last_sync_lsn
= log
->l_tail_lsn
;
1061 log
->l_curr_cycle
= 1; /* 0 is bad since this is initial value */
1062 log
->l_grant_reserve_cycle
= 1;
1063 log
->l_grant_write_cycle
= 1;
1065 error
= EFSCORRUPTED
;
1066 if (xfs_sb_version_hassector(&mp
->m_sb
)) {
1067 log
->l_sectbb_log
= mp
->m_sb
.sb_logsectlog
- BBSHIFT
;
1068 if (log
->l_sectbb_log
< 0 ||
1069 log
->l_sectbb_log
> mp
->m_sectbb_log
) {
1070 xlog_warn("XFS: Log sector size (0x%x) out of range.",
1075 /* for larger sector sizes, must have v2 or external log */
1076 if (log
->l_sectbb_log
!= 0 &&
1077 (log
->l_logBBstart
!= 0 &&
1078 !xfs_sb_version_haslogv2(&mp
->m_sb
))) {
1079 xlog_warn("XFS: log sector size (0x%x) invalid "
1080 "for configuration.", log
->l_sectbb_log
);
1083 if (mp
->m_sb
.sb_logsectlog
< BBSHIFT
) {
1084 xlog_warn("XFS: Log sector log (0x%x) too small.",
1085 mp
->m_sb
.sb_logsectlog
);
1089 log
->l_sectbb_mask
= (1 << log
->l_sectbb_log
) - 1;
1091 xlog_get_iclog_buffer_size(mp
, log
);
1094 bp
= xfs_buf_get_empty(log
->l_iclog_size
, mp
->m_logdev_targp
);
1097 XFS_BUF_SET_IODONE_FUNC(bp
, xlog_iodone
);
1098 XFS_BUF_SET_FSPRIVATE2(bp
, (unsigned long)1);
1099 ASSERT(XFS_BUF_ISBUSY(bp
));
1100 ASSERT(XFS_BUF_VALUSEMA(bp
) <= 0);
1103 spin_lock_init(&log
->l_icloglock
);
1104 spin_lock_init(&log
->l_grant_lock
);
1105 sv_init(&log
->l_flush_wait
, 0, "flush_wait");
1107 /* log record size must be multiple of BBSIZE; see xlog_rec_header_t */
1108 ASSERT((XFS_BUF_SIZE(bp
) & BBMASK
) == 0);
1110 iclogp
= &log
->l_iclog
;
1112 * The amount of memory to allocate for the iclog structure is
1113 * rather funky due to the way the structure is defined. It is
1114 * done this way so that we can use different sizes for machines
1115 * with different amounts of memory. See the definition of
1116 * xlog_in_core_t in xfs_log_priv.h for details.
1118 iclogsize
= log
->l_iclog_size
;
1119 ASSERT(log
->l_iclog_size
>= 4096);
1120 for (i
=0; i
< log
->l_iclog_bufs
; i
++) {
1121 *iclogp
= kmem_zalloc(sizeof(xlog_in_core_t
), KM_MAYFAIL
);
1123 goto out_free_iclog
;
1126 iclog
->ic_prev
= prev_iclog
;
1129 bp
= xfs_buf_get_noaddr(log
->l_iclog_size
, mp
->m_logdev_targp
);
1131 goto out_free_iclog
;
1132 if (!XFS_BUF_CPSEMA(bp
))
1134 XFS_BUF_SET_IODONE_FUNC(bp
, xlog_iodone
);
1135 XFS_BUF_SET_FSPRIVATE2(bp
, (unsigned long)1);
1137 iclog
->ic_data
= bp
->b_addr
;
1139 log
->l_iclog_bak
[i
] = (xfs_caddr_t
)&(iclog
->ic_header
);
1141 head
= &iclog
->ic_header
;
1142 memset(head
, 0, sizeof(xlog_rec_header_t
));
1143 head
->h_magicno
= cpu_to_be32(XLOG_HEADER_MAGIC_NUM
);
1144 head
->h_version
= cpu_to_be32(
1145 xfs_sb_version_haslogv2(&log
->l_mp
->m_sb
) ? 2 : 1);
1146 head
->h_size
= cpu_to_be32(log
->l_iclog_size
);
1148 head
->h_fmt
= cpu_to_be32(XLOG_FMT
);
1149 memcpy(&head
->h_fs_uuid
, &mp
->m_sb
.sb_uuid
, sizeof(uuid_t
));
1151 iclog
->ic_size
= XFS_BUF_SIZE(bp
) - log
->l_iclog_hsize
;
1152 iclog
->ic_state
= XLOG_STATE_ACTIVE
;
1153 iclog
->ic_log
= log
;
1154 atomic_set(&iclog
->ic_refcnt
, 0);
1155 spin_lock_init(&iclog
->ic_callback_lock
);
1156 iclog
->ic_callback_tail
= &(iclog
->ic_callback
);
1157 iclog
->ic_datap
= (char *)iclog
->ic_data
+ log
->l_iclog_hsize
;
1159 ASSERT(XFS_BUF_ISBUSY(iclog
->ic_bp
));
1160 ASSERT(XFS_BUF_VALUSEMA(iclog
->ic_bp
) <= 0);
1161 sv_init(&iclog
->ic_force_wait
, SV_DEFAULT
, "iclog-force");
1162 sv_init(&iclog
->ic_write_wait
, SV_DEFAULT
, "iclog-write");
1164 iclogp
= &iclog
->ic_next
;
1166 *iclogp
= log
->l_iclog
; /* complete ring */
1167 log
->l_iclog
->ic_prev
= prev_iclog
; /* re-write 1st prev ptr */
1172 for (iclog
= log
->l_iclog
; iclog
; iclog
= prev_iclog
) {
1173 prev_iclog
= iclog
->ic_next
;
1175 sv_destroy(&iclog
->ic_force_wait
);
1176 sv_destroy(&iclog
->ic_write_wait
);
1177 xfs_buf_free(iclog
->ic_bp
);
1181 spinlock_destroy(&log
->l_icloglock
);
1182 spinlock_destroy(&log
->l_grant_lock
);
1183 xfs_buf_free(log
->l_xbuf
);
1187 return ERR_PTR(-error
);
1188 } /* xlog_alloc_log */
1192 * Write out the commit record of a transaction associated with the given
1193 * ticket. Return the lsn of the commit record.
1198 struct xlog_ticket
*ticket
,
1199 struct xlog_in_core
**iclog
,
1200 xfs_lsn_t
*commitlsnp
)
1202 struct xfs_mount
*mp
= log
->l_mp
;
1204 struct xfs_log_iovec reg
= {
1207 .i_type
= XLOG_REG_TYPE_COMMIT
,
1209 struct xfs_log_vec vec
= {
1214 ASSERT_ALWAYS(iclog
);
1215 error
= xlog_write(log
, &vec
, ticket
, commitlsnp
, iclog
,
1218 xfs_force_shutdown(mp
, SHUTDOWN_LOG_IO_ERROR
);
1223 * Push on the buffer cache code if we ever use more than 75% of the on-disk
1224 * log space. This code pushes on the lsn which would supposedly free up
1225 * the 25% which we want to leave free. We may need to adopt a policy which
1226 * pushes on an lsn which is further along in the log once we reach the high
1227 * water mark. In this manner, we would be creating a low water mark.
1230 xlog_grant_push_ail(xfs_mount_t
*mp
,
1233 xlog_t
*log
= mp
->m_log
; /* pointer to the log */
1234 xfs_lsn_t tail_lsn
; /* lsn of the log tail */
1235 xfs_lsn_t threshold_lsn
= 0; /* lsn we'd like to be at */
1236 int free_blocks
; /* free blocks left to write to */
1237 int free_bytes
; /* free bytes left to write to */
1238 int threshold_block
; /* block in lsn we'd like to be at */
1239 int threshold_cycle
; /* lsn cycle we'd like to be at */
1242 ASSERT(BTOBB(need_bytes
) < log
->l_logBBsize
);
1244 spin_lock(&log
->l_grant_lock
);
1245 free_bytes
= xlog_space_left(log
,
1246 log
->l_grant_reserve_cycle
,
1247 log
->l_grant_reserve_bytes
);
1248 tail_lsn
= log
->l_tail_lsn
;
1249 free_blocks
= BTOBBT(free_bytes
);
1252 * Set the threshold for the minimum number of free blocks in the
1253 * log to the maximum of what the caller needs, one quarter of the
1254 * log, and 256 blocks.
1256 free_threshold
= BTOBB(need_bytes
);
1257 free_threshold
= MAX(free_threshold
, (log
->l_logBBsize
>> 2));
1258 free_threshold
= MAX(free_threshold
, 256);
1259 if (free_blocks
< free_threshold
) {
1260 threshold_block
= BLOCK_LSN(tail_lsn
) + free_threshold
;
1261 threshold_cycle
= CYCLE_LSN(tail_lsn
);
1262 if (threshold_block
>= log
->l_logBBsize
) {
1263 threshold_block
-= log
->l_logBBsize
;
1264 threshold_cycle
+= 1;
1266 threshold_lsn
= xlog_assign_lsn(threshold_cycle
, threshold_block
);
1268 /* Don't pass in an lsn greater than the lsn of the last
1269 * log record known to be on disk.
1271 if (XFS_LSN_CMP(threshold_lsn
, log
->l_last_sync_lsn
) > 0)
1272 threshold_lsn
= log
->l_last_sync_lsn
;
1274 spin_unlock(&log
->l_grant_lock
);
1277 * Get the transaction layer to kick the dirty buffers out to
1278 * disk asynchronously. No point in trying to do this if
1279 * the filesystem is shutting down.
1281 if (threshold_lsn
&&
1282 !XLOG_FORCED_SHUTDOWN(log
))
1283 xfs_trans_ail_push(log
->l_ailp
, threshold_lsn
);
1284 } /* xlog_grant_push_ail */
1287 * The bdstrat callback function for log bufs. This gives us a central
1288 * place to trap bufs in case we get hit by a log I/O error and need to
1289 * shutdown. Actually, in practice, even when we didn't get a log error,
1290 * we transition the iclogs to IOERROR state *after* flushing all existing
1291 * iclogs to disk. This is because we don't want anymore new transactions to be
1292 * started or completed afterwards.
1298 struct xlog_in_core
*iclog
;
1300 iclog
= XFS_BUF_FSPRIVATE(bp
, xlog_in_core_t
*);
1301 if (iclog
->ic_state
& XLOG_STATE_IOERROR
) {
1302 XFS_BUF_ERROR(bp
, EIO
);
1306 * It would seem logical to return EIO here, but we rely on
1307 * the log state machine to propagate I/O errors instead of
1313 bp
->b_flags
|= _XBF_RUN_QUEUES
;
1314 xfs_buf_iorequest(bp
);
1319 * Flush out the in-core log (iclog) to the on-disk log in an asynchronous
1320 * fashion. Previously, we should have moved the current iclog
1321 * ptr in the log to point to the next available iclog. This allows further
1322 * write to continue while this code syncs out an iclog ready to go.
1323 * Before an in-core log can be written out, the data section must be scanned
1324 * to save away the 1st word of each BBSIZE block into the header. We replace
1325 * it with the current cycle count. Each BBSIZE block is tagged with the
1326 * cycle count because there in an implicit assumption that drives will
1327 * guarantee that entire 512 byte blocks get written at once. In other words,
1328 * we can't have part of a 512 byte block written and part not written. By
1329 * tagging each block, we will know which blocks are valid when recovering
1330 * after an unclean shutdown.
1332 * This routine is single threaded on the iclog. No other thread can be in
1333 * this routine with the same iclog. Changing contents of iclog can there-
1334 * fore be done without grabbing the state machine lock. Updating the global
1335 * log will require grabbing the lock though.
1337 * The entire log manager uses a logical block numbering scheme. Only
1338 * log_sync (and then only bwrite()) know about the fact that the log may
1339 * not start with block zero on a given device. The log block start offset
1340 * is added immediately before calling bwrite().
1344 xlog_sync(xlog_t
*log
,
1345 xlog_in_core_t
*iclog
)
1347 xfs_caddr_t dptr
; /* pointer to byte sized element */
1350 uint count
; /* byte count of bwrite */
1351 uint count_init
; /* initial count before roundup */
1352 int roundoff
; /* roundoff to BB or stripe */
1353 int split
= 0; /* split write into two regions */
1355 int v2
= xfs_sb_version_haslogv2(&log
->l_mp
->m_sb
);
1357 XFS_STATS_INC(xs_log_writes
);
1358 ASSERT(atomic_read(&iclog
->ic_refcnt
) == 0);
1360 /* Add for LR header */
1361 count_init
= log
->l_iclog_hsize
+ iclog
->ic_offset
;
1363 /* Round out the log write size */
1364 if (v2
&& log
->l_mp
->m_sb
.sb_logsunit
> 1) {
1365 /* we have a v2 stripe unit to use */
1366 count
= XLOG_LSUNITTOB(log
, XLOG_BTOLSUNIT(log
, count_init
));
1368 count
= BBTOB(BTOBB(count_init
));
1370 roundoff
= count
- count_init
;
1371 ASSERT(roundoff
>= 0);
1372 ASSERT((v2
&& log
->l_mp
->m_sb
.sb_logsunit
> 1 &&
1373 roundoff
< log
->l_mp
->m_sb
.sb_logsunit
)
1375 (log
->l_mp
->m_sb
.sb_logsunit
<= 1 &&
1376 roundoff
< BBTOB(1)));
1378 /* move grant heads by roundoff in sync */
1379 spin_lock(&log
->l_grant_lock
);
1380 xlog_grant_add_space(log
, roundoff
);
1381 spin_unlock(&log
->l_grant_lock
);
1383 /* put cycle number in every block */
1384 xlog_pack_data(log
, iclog
, roundoff
);
1386 /* real byte length */
1388 iclog
->ic_header
.h_len
=
1389 cpu_to_be32(iclog
->ic_offset
+ roundoff
);
1391 iclog
->ic_header
.h_len
=
1392 cpu_to_be32(iclog
->ic_offset
);
1396 ASSERT(XFS_BUF_FSPRIVATE2(bp
, unsigned long) == (unsigned long)1);
1397 XFS_BUF_SET_FSPRIVATE2(bp
, (unsigned long)2);
1398 XFS_BUF_SET_ADDR(bp
, BLOCK_LSN(be64_to_cpu(iclog
->ic_header
.h_lsn
)));
1400 XFS_STATS_ADD(xs_log_blocks
, BTOBB(count
));
1402 /* Do we need to split this write into 2 parts? */
1403 if (XFS_BUF_ADDR(bp
) + BTOBB(count
) > log
->l_logBBsize
) {
1404 split
= count
- (BBTOB(log
->l_logBBsize
- XFS_BUF_ADDR(bp
)));
1405 count
= BBTOB(log
->l_logBBsize
- XFS_BUF_ADDR(bp
));
1406 iclog
->ic_bwritecnt
= 2; /* split into 2 writes */
1408 iclog
->ic_bwritecnt
= 1;
1410 XFS_BUF_SET_COUNT(bp
, count
);
1411 XFS_BUF_SET_FSPRIVATE(bp
, iclog
); /* save for later */
1412 XFS_BUF_ZEROFLAGS(bp
);
1415 bp
->b_flags
|= XBF_LOG_BUFFER
;
1417 * Do an ordered write for the log block.
1418 * Its unnecessary to flush the first split block in the log wrap case.
1420 if (!split
&& (log
->l_mp
->m_flags
& XFS_MOUNT_BARRIER
))
1421 XFS_BUF_ORDERED(bp
);
1423 ASSERT(XFS_BUF_ADDR(bp
) <= log
->l_logBBsize
-1);
1424 ASSERT(XFS_BUF_ADDR(bp
) + BTOBB(count
) <= log
->l_logBBsize
);
1426 xlog_verify_iclog(log
, iclog
, count
, B_TRUE
);
1428 /* account for log which doesn't start at block #0 */
1429 XFS_BUF_SET_ADDR(bp
, XFS_BUF_ADDR(bp
) + log
->l_logBBstart
);
1431 * Don't call xfs_bwrite here. We do log-syncs even when the filesystem
1436 if ((error
= xlog_bdstrat(bp
))) {
1437 xfs_ioerror_alert("xlog_sync", log
->l_mp
, bp
,
1442 bp
= iclog
->ic_log
->l_xbuf
;
1443 ASSERT(XFS_BUF_FSPRIVATE2(bp
, unsigned long) ==
1445 XFS_BUF_SET_FSPRIVATE2(bp
, (unsigned long)2);
1446 XFS_BUF_SET_ADDR(bp
, 0); /* logical 0 */
1447 XFS_BUF_SET_PTR(bp
, (xfs_caddr_t
)((__psint_t
)&(iclog
->ic_header
)+
1448 (__psint_t
)count
), split
);
1449 XFS_BUF_SET_FSPRIVATE(bp
, iclog
);
1450 XFS_BUF_ZEROFLAGS(bp
);
1453 bp
->b_flags
|= XBF_LOG_BUFFER
;
1454 if (log
->l_mp
->m_flags
& XFS_MOUNT_BARRIER
)
1455 XFS_BUF_ORDERED(bp
);
1456 dptr
= XFS_BUF_PTR(bp
);
1458 * Bump the cycle numbers at the start of each block
1459 * since this part of the buffer is at the start of
1460 * a new cycle. Watch out for the header magic number
1463 for (i
= 0; i
< split
; i
+= BBSIZE
) {
1464 be32_add_cpu((__be32
*)dptr
, 1);
1465 if (be32_to_cpu(*(__be32
*)dptr
) == XLOG_HEADER_MAGIC_NUM
)
1466 be32_add_cpu((__be32
*)dptr
, 1);
1470 ASSERT(XFS_BUF_ADDR(bp
) <= log
->l_logBBsize
-1);
1471 ASSERT(XFS_BUF_ADDR(bp
) + BTOBB(count
) <= log
->l_logBBsize
);
1473 /* account for internal log which doesn't start at block #0 */
1474 XFS_BUF_SET_ADDR(bp
, XFS_BUF_ADDR(bp
) + log
->l_logBBstart
);
1476 if ((error
= xlog_bdstrat(bp
))) {
1477 xfs_ioerror_alert("xlog_sync (split)", log
->l_mp
,
1478 bp
, XFS_BUF_ADDR(bp
));
1487 * Deallocate a log structure
1490 xlog_dealloc_log(xlog_t
*log
)
1492 xlog_in_core_t
*iclog
, *next_iclog
;
1495 iclog
= log
->l_iclog
;
1496 for (i
=0; i
<log
->l_iclog_bufs
; i
++) {
1497 sv_destroy(&iclog
->ic_force_wait
);
1498 sv_destroy(&iclog
->ic_write_wait
);
1499 xfs_buf_free(iclog
->ic_bp
);
1500 next_iclog
= iclog
->ic_next
;
1504 spinlock_destroy(&log
->l_icloglock
);
1505 spinlock_destroy(&log
->l_grant_lock
);
1507 xfs_buf_free(log
->l_xbuf
);
1508 log
->l_mp
->m_log
= NULL
;
1510 } /* xlog_dealloc_log */
1513 * Update counters atomically now that memcpy is done.
1517 xlog_state_finish_copy(xlog_t
*log
,
1518 xlog_in_core_t
*iclog
,
1522 spin_lock(&log
->l_icloglock
);
1524 be32_add_cpu(&iclog
->ic_header
.h_num_logops
, record_cnt
);
1525 iclog
->ic_offset
+= copy_bytes
;
1527 spin_unlock(&log
->l_icloglock
);
1528 } /* xlog_state_finish_copy */
1534 * print out info relating to regions written which consume
1538 xlog_print_tic_res(xfs_mount_t
*mp
, xlog_ticket_t
*ticket
)
1541 uint ophdr_spc
= ticket
->t_res_num_ophdrs
* (uint
)sizeof(xlog_op_header_t
);
1543 /* match with XLOG_REG_TYPE_* in xfs_log.h */
1544 static char *res_type_str
[XLOG_REG_TYPE_MAX
] = {
1565 static char *trans_type_str
[XFS_TRANS_TYPE_MAX
] = {
1608 xfs_fs_cmn_err(CE_WARN
, mp
,
1609 "xfs_log_write: reservation summary:\n"
1610 " trans type = %s (%u)\n"
1611 " unit res = %d bytes\n"
1612 " current res = %d bytes\n"
1613 " total reg = %u bytes (o/flow = %u bytes)\n"
1614 " ophdrs = %u (ophdr space = %u bytes)\n"
1615 " ophdr + reg = %u bytes\n"
1616 " num regions = %u\n",
1617 ((ticket
->t_trans_type
<= 0 ||
1618 ticket
->t_trans_type
> XFS_TRANS_TYPE_MAX
) ?
1619 "bad-trans-type" : trans_type_str
[ticket
->t_trans_type
-1]),
1620 ticket
->t_trans_type
,
1623 ticket
->t_res_arr_sum
, ticket
->t_res_o_flow
,
1624 ticket
->t_res_num_ophdrs
, ophdr_spc
,
1625 ticket
->t_res_arr_sum
+
1626 ticket
->t_res_o_flow
+ ophdr_spc
,
1629 for (i
= 0; i
< ticket
->t_res_num
; i
++) {
1630 uint r_type
= ticket
->t_res_arr
[i
].r_type
;
1632 "region[%u]: %s - %u bytes\n",
1634 ((r_type
<= 0 || r_type
> XLOG_REG_TYPE_MAX
) ?
1635 "bad-rtype" : res_type_str
[r_type
-1]),
1636 ticket
->t_res_arr
[i
].r_len
);
1641 * Calculate the potential space needed by the log vector. Each region gets
1642 * its own xlog_op_header_t and may need to be double word aligned.
1645 xlog_write_calc_vec_length(
1646 struct xlog_ticket
*ticket
,
1647 struct xfs_log_vec
*log_vector
)
1649 struct xfs_log_vec
*lv
;
1654 /* acct for start rec of xact */
1655 if (ticket
->t_flags
& XLOG_TIC_INITED
)
1658 for (lv
= log_vector
; lv
; lv
= lv
->lv_next
) {
1659 headers
+= lv
->lv_niovecs
;
1661 for (i
= 0; i
< lv
->lv_niovecs
; i
++) {
1662 struct xfs_log_iovec
*vecp
= &lv
->lv_iovecp
[i
];
1665 xlog_tic_add_region(ticket
, vecp
->i_len
, vecp
->i_type
);
1669 ticket
->t_res_num_ophdrs
+= headers
;
1670 len
+= headers
* sizeof(struct xlog_op_header
);
1676 * If first write for transaction, insert start record We can't be trying to
1677 * commit if we are inited. We can't have any "partial_copy" if we are inited.
1680 xlog_write_start_rec(
1681 struct xlog_op_header
*ophdr
,
1682 struct xlog_ticket
*ticket
)
1684 if (!(ticket
->t_flags
& XLOG_TIC_INITED
))
1687 ophdr
->oh_tid
= cpu_to_be32(ticket
->t_tid
);
1688 ophdr
->oh_clientid
= ticket
->t_clientid
;
1690 ophdr
->oh_flags
= XLOG_START_TRANS
;
1693 ticket
->t_flags
&= ~XLOG_TIC_INITED
;
1695 return sizeof(struct xlog_op_header
);
1698 static xlog_op_header_t
*
1699 xlog_write_setup_ophdr(
1701 struct xlog_op_header
*ophdr
,
1702 struct xlog_ticket
*ticket
,
1705 ophdr
->oh_tid
= cpu_to_be32(ticket
->t_tid
);
1706 ophdr
->oh_clientid
= ticket
->t_clientid
;
1709 /* are we copying a commit or unmount record? */
1710 ophdr
->oh_flags
= flags
;
1713 * We've seen logs corrupted with bad transaction client ids. This
1714 * makes sure that XFS doesn't generate them on. Turn this into an EIO
1715 * and shut down the filesystem.
1717 switch (ophdr
->oh_clientid
) {
1718 case XFS_TRANSACTION
:
1723 xfs_fs_cmn_err(CE_WARN
, log
->l_mp
,
1724 "Bad XFS transaction clientid 0x%x in ticket 0x%p",
1725 ophdr
->oh_clientid
, ticket
);
1733 * Set up the parameters of the region copy into the log. This has
1734 * to handle region write split across multiple log buffers - this
1735 * state is kept external to this function so that this code can
1736 * can be written in an obvious, self documenting manner.
1739 xlog_write_setup_copy(
1740 struct xlog_ticket
*ticket
,
1741 struct xlog_op_header
*ophdr
,
1742 int space_available
,
1746 int *last_was_partial_copy
,
1747 int *bytes_consumed
)
1751 still_to_copy
= space_required
- *bytes_consumed
;
1752 *copy_off
= *bytes_consumed
;
1754 if (still_to_copy
<= space_available
) {
1755 /* write of region completes here */
1756 *copy_len
= still_to_copy
;
1757 ophdr
->oh_len
= cpu_to_be32(*copy_len
);
1758 if (*last_was_partial_copy
)
1759 ophdr
->oh_flags
|= (XLOG_END_TRANS
|XLOG_WAS_CONT_TRANS
);
1760 *last_was_partial_copy
= 0;
1761 *bytes_consumed
= 0;
1765 /* partial write of region, needs extra log op header reservation */
1766 *copy_len
= space_available
;
1767 ophdr
->oh_len
= cpu_to_be32(*copy_len
);
1768 ophdr
->oh_flags
|= XLOG_CONTINUE_TRANS
;
1769 if (*last_was_partial_copy
)
1770 ophdr
->oh_flags
|= XLOG_WAS_CONT_TRANS
;
1771 *bytes_consumed
+= *copy_len
;
1772 (*last_was_partial_copy
)++;
1774 /* account for new log op header */
1775 ticket
->t_curr_res
-= sizeof(struct xlog_op_header
);
1776 ticket
->t_res_num_ophdrs
++;
1778 return sizeof(struct xlog_op_header
);
1782 xlog_write_copy_finish(
1784 struct xlog_in_core
*iclog
,
1789 int *partial_copy_len
,
1791 struct xlog_in_core
**commit_iclog
)
1793 if (*partial_copy
) {
1795 * This iclog has already been marked WANT_SYNC by
1796 * xlog_state_get_iclog_space.
1798 xlog_state_finish_copy(log
, iclog
, *record_cnt
, *data_cnt
);
1801 return xlog_state_release_iclog(log
, iclog
);
1805 *partial_copy_len
= 0;
1807 if (iclog
->ic_size
- log_offset
<= sizeof(xlog_op_header_t
)) {
1808 /* no more space in this iclog - push it. */
1809 xlog_state_finish_copy(log
, iclog
, *record_cnt
, *data_cnt
);
1813 spin_lock(&log
->l_icloglock
);
1814 xlog_state_want_sync(log
, iclog
);
1815 spin_unlock(&log
->l_icloglock
);
1818 return xlog_state_release_iclog(log
, iclog
);
1819 ASSERT(flags
& XLOG_COMMIT_TRANS
);
1820 *commit_iclog
= iclog
;
1827 * Write some region out to in-core log
1829 * This will be called when writing externally provided regions or when
1830 * writing out a commit record for a given transaction.
1832 * General algorithm:
1833 * 1. Find total length of this write. This may include adding to the
1834 * lengths passed in.
1835 * 2. Check whether we violate the tickets reservation.
1836 * 3. While writing to this iclog
1837 * A. Reserve as much space in this iclog as can get
1838 * B. If this is first write, save away start lsn
1839 * C. While writing this region:
1840 * 1. If first write of transaction, write start record
1841 * 2. Write log operation header (header per region)
1842 * 3. Find out if we can fit entire region into this iclog
1843 * 4. Potentially, verify destination memcpy ptr
1844 * 5. Memcpy (partial) region
1845 * 6. If partial copy, release iclog; otherwise, continue
1846 * copying more regions into current iclog
1847 * 4. Mark want sync bit (in simulation mode)
1848 * 5. Release iclog for potential flush to on-disk log.
1851 * 1. Panic if reservation is overrun. This should never happen since
1852 * reservation amounts are generated internal to the filesystem.
1854 * 1. Tickets are single threaded data structures.
1855 * 2. The XLOG_END_TRANS & XLOG_CONTINUE_TRANS flags are passed down to the
1856 * syncing routine. When a single log_write region needs to span
1857 * multiple in-core logs, the XLOG_CONTINUE_TRANS bit should be set
1858 * on all log operation writes which don't contain the end of the
1859 * region. The XLOG_END_TRANS bit is used for the in-core log
1860 * operation which contains the end of the continued log_write region.
1861 * 3. When xlog_state_get_iclog_space() grabs the rest of the current iclog,
1862 * we don't really know exactly how much space will be used. As a result,
1863 * we don't update ic_offset until the end when we know exactly how many
1864 * bytes have been written out.
1869 struct xfs_log_vec
*log_vector
,
1870 struct xlog_ticket
*ticket
,
1871 xfs_lsn_t
*start_lsn
,
1872 struct xlog_in_core
**commit_iclog
,
1875 struct xlog_in_core
*iclog
= NULL
;
1876 struct xfs_log_iovec
*vecp
;
1877 struct xfs_log_vec
*lv
;
1880 int partial_copy
= 0;
1881 int partial_copy_len
= 0;
1889 len
= xlog_write_calc_vec_length(ticket
, log_vector
);
1890 if (ticket
->t_curr_res
< len
) {
1891 xlog_print_tic_res(log
->l_mp
, ticket
);
1894 "xfs_log_write: reservation ran out. Need to up reservation");
1896 /* Customer configurable panic */
1897 xfs_cmn_err(XFS_PTAG_LOGRES
, CE_ALERT
, log
->l_mp
,
1898 "xfs_log_write: reservation ran out. Need to up reservation");
1900 /* If we did not panic, shutdown the filesystem */
1901 xfs_force_shutdown(log
->l_mp
, SHUTDOWN_CORRUPT_INCORE
);
1905 ticket
->t_curr_res
-= len
;
1909 vecp
= lv
->lv_iovecp
;
1910 while (lv
&& index
< lv
->lv_niovecs
) {
1914 error
= xlog_state_get_iclog_space(log
, len
, &iclog
, ticket
,
1915 &contwr
, &log_offset
);
1919 ASSERT(log_offset
<= iclog
->ic_size
- 1);
1920 ptr
= iclog
->ic_datap
+ log_offset
;
1922 /* start_lsn is the first lsn written to. That's all we need. */
1924 *start_lsn
= be64_to_cpu(iclog
->ic_header
.h_lsn
);
1927 * This loop writes out as many regions as can fit in the amount
1928 * of space which was allocated by xlog_state_get_iclog_space().
1930 while (lv
&& index
< lv
->lv_niovecs
) {
1931 struct xfs_log_iovec
*reg
= &vecp
[index
];
1932 struct xlog_op_header
*ophdr
;
1937 ASSERT(reg
->i_len
% sizeof(__int32_t
) == 0);
1938 ASSERT((unsigned long)ptr
% sizeof(__int32_t
) == 0);
1940 start_rec_copy
= xlog_write_start_rec(ptr
, ticket
);
1941 if (start_rec_copy
) {
1943 xlog_write_adv_cnt(&ptr
, &len
, &log_offset
,
1947 ophdr
= xlog_write_setup_ophdr(log
, ptr
, ticket
, flags
);
1949 return XFS_ERROR(EIO
);
1951 xlog_write_adv_cnt(&ptr
, &len
, &log_offset
,
1952 sizeof(struct xlog_op_header
));
1954 len
+= xlog_write_setup_copy(ticket
, ophdr
,
1955 iclog
->ic_size
-log_offset
,
1957 ©_off
, ©_len
,
1960 xlog_verify_dest_ptr(log
, ptr
);
1963 ASSERT(copy_len
>= 0);
1964 memcpy(ptr
, reg
->i_addr
+ copy_off
, copy_len
);
1965 xlog_write_adv_cnt(&ptr
, &len
, &log_offset
, copy_len
);
1967 copy_len
+= start_rec_copy
+ sizeof(xlog_op_header_t
);
1969 data_cnt
+= contwr
? copy_len
: 0;
1971 error
= xlog_write_copy_finish(log
, iclog
, flags
,
1972 &record_cnt
, &data_cnt
,
1981 * if we had a partial copy, we need to get more iclog
1982 * space but we don't want to increment the region
1983 * index because there is still more is this region to
1986 * If we completed writing this region, and we flushed
1987 * the iclog (indicated by resetting of the record
1988 * count), then we also need to get more log space. If
1989 * this was the last record, though, we are done and
1995 if (++index
== lv
->lv_niovecs
) {
1999 vecp
= lv
->lv_iovecp
;
2001 if (record_cnt
== 0) {
2011 xlog_state_finish_copy(log
, iclog
, record_cnt
, data_cnt
);
2013 return xlog_state_release_iclog(log
, iclog
);
2015 ASSERT(flags
& XLOG_COMMIT_TRANS
);
2016 *commit_iclog
= iclog
;
2021 /*****************************************************************************
2023 * State Machine functions
2025 *****************************************************************************
2028 /* Clean iclogs starting from the head. This ordering must be
2029 * maintained, so an iclog doesn't become ACTIVE beyond one that
2030 * is SYNCING. This is also required to maintain the notion that we use
2031 * a ordered wait queue to hold off would be writers to the log when every
2032 * iclog is trying to sync to disk.
2034 * State Change: DIRTY -> ACTIVE
2037 xlog_state_clean_log(xlog_t
*log
)
2039 xlog_in_core_t
*iclog
;
2042 iclog
= log
->l_iclog
;
2044 if (iclog
->ic_state
== XLOG_STATE_DIRTY
) {
2045 iclog
->ic_state
= XLOG_STATE_ACTIVE
;
2046 iclog
->ic_offset
= 0;
2047 ASSERT(iclog
->ic_callback
== NULL
);
2049 * If the number of ops in this iclog indicate it just
2050 * contains the dummy transaction, we can
2051 * change state into IDLE (the second time around).
2052 * Otherwise we should change the state into
2054 * We don't need to cover the dummy.
2057 (be32_to_cpu(iclog
->ic_header
.h_num_logops
) ==
2062 * We have two dirty iclogs so start over
2063 * This could also be num of ops indicates
2064 * this is not the dummy going out.
2068 iclog
->ic_header
.h_num_logops
= 0;
2069 memset(iclog
->ic_header
.h_cycle_data
, 0,
2070 sizeof(iclog
->ic_header
.h_cycle_data
));
2071 iclog
->ic_header
.h_lsn
= 0;
2072 } else if (iclog
->ic_state
== XLOG_STATE_ACTIVE
)
2075 break; /* stop cleaning */
2076 iclog
= iclog
->ic_next
;
2077 } while (iclog
!= log
->l_iclog
);
2079 /* log is locked when we are called */
2081 * Change state for the dummy log recording.
2082 * We usually go to NEED. But we go to NEED2 if the changed indicates
2083 * we are done writing the dummy record.
2084 * If we are done with the second dummy recored (DONE2), then
2088 switch (log
->l_covered_state
) {
2089 case XLOG_STATE_COVER_IDLE
:
2090 case XLOG_STATE_COVER_NEED
:
2091 case XLOG_STATE_COVER_NEED2
:
2092 log
->l_covered_state
= XLOG_STATE_COVER_NEED
;
2095 case XLOG_STATE_COVER_DONE
:
2097 log
->l_covered_state
= XLOG_STATE_COVER_NEED2
;
2099 log
->l_covered_state
= XLOG_STATE_COVER_NEED
;
2102 case XLOG_STATE_COVER_DONE2
:
2104 log
->l_covered_state
= XLOG_STATE_COVER_IDLE
;
2106 log
->l_covered_state
= XLOG_STATE_COVER_NEED
;
2113 } /* xlog_state_clean_log */
2116 xlog_get_lowest_lsn(
2119 xlog_in_core_t
*lsn_log
;
2120 xfs_lsn_t lowest_lsn
, lsn
;
2122 lsn_log
= log
->l_iclog
;
2125 if (!(lsn_log
->ic_state
& (XLOG_STATE_ACTIVE
|XLOG_STATE_DIRTY
))) {
2126 lsn
= be64_to_cpu(lsn_log
->ic_header
.h_lsn
);
2127 if ((lsn
&& !lowest_lsn
) ||
2128 (XFS_LSN_CMP(lsn
, lowest_lsn
) < 0)) {
2132 lsn_log
= lsn_log
->ic_next
;
2133 } while (lsn_log
!= log
->l_iclog
);
2139 xlog_state_do_callback(
2142 xlog_in_core_t
*ciclog
)
2144 xlog_in_core_t
*iclog
;
2145 xlog_in_core_t
*first_iclog
; /* used to know when we've
2146 * processed all iclogs once */
2147 xfs_log_callback_t
*cb
, *cb_next
;
2149 xfs_lsn_t lowest_lsn
;
2150 int ioerrors
; /* counter: iclogs with errors */
2151 int loopdidcallbacks
; /* flag: inner loop did callbacks*/
2152 int funcdidcallbacks
; /* flag: function did callbacks */
2153 int repeats
; /* for issuing console warnings if
2154 * looping too many times */
2157 spin_lock(&log
->l_icloglock
);
2158 first_iclog
= iclog
= log
->l_iclog
;
2160 funcdidcallbacks
= 0;
2165 * Scan all iclogs starting with the one pointed to by the
2166 * log. Reset this starting point each time the log is
2167 * unlocked (during callbacks).
2169 * Keep looping through iclogs until one full pass is made
2170 * without running any callbacks.
2172 first_iclog
= log
->l_iclog
;
2173 iclog
= log
->l_iclog
;
2174 loopdidcallbacks
= 0;
2179 /* skip all iclogs in the ACTIVE & DIRTY states */
2180 if (iclog
->ic_state
&
2181 (XLOG_STATE_ACTIVE
|XLOG_STATE_DIRTY
)) {
2182 iclog
= iclog
->ic_next
;
2187 * Between marking a filesystem SHUTDOWN and stopping
2188 * the log, we do flush all iclogs to disk (if there
2189 * wasn't a log I/O error). So, we do want things to
2190 * go smoothly in case of just a SHUTDOWN w/o a
2193 if (!(iclog
->ic_state
& XLOG_STATE_IOERROR
)) {
2195 * Can only perform callbacks in order. Since
2196 * this iclog is not in the DONE_SYNC/
2197 * DO_CALLBACK state, we skip the rest and
2198 * just try to clean up. If we set our iclog
2199 * to DO_CALLBACK, we will not process it when
2200 * we retry since a previous iclog is in the
2201 * CALLBACK and the state cannot change since
2202 * we are holding the l_icloglock.
2204 if (!(iclog
->ic_state
&
2205 (XLOG_STATE_DONE_SYNC
|
2206 XLOG_STATE_DO_CALLBACK
))) {
2207 if (ciclog
&& (ciclog
->ic_state
==
2208 XLOG_STATE_DONE_SYNC
)) {
2209 ciclog
->ic_state
= XLOG_STATE_DO_CALLBACK
;
2214 * We now have an iclog that is in either the
2215 * DO_CALLBACK or DONE_SYNC states. The other
2216 * states (WANT_SYNC, SYNCING, or CALLBACK were
2217 * caught by the above if and are going to
2218 * clean (i.e. we aren't doing their callbacks)
2223 * We will do one more check here to see if we
2224 * have chased our tail around.
2227 lowest_lsn
= xlog_get_lowest_lsn(log
);
2229 XFS_LSN_CMP(lowest_lsn
,
2230 be64_to_cpu(iclog
->ic_header
.h_lsn
)) < 0) {
2231 iclog
= iclog
->ic_next
;
2232 continue; /* Leave this iclog for
2236 iclog
->ic_state
= XLOG_STATE_CALLBACK
;
2238 spin_unlock(&log
->l_icloglock
);
2240 /* l_last_sync_lsn field protected by
2241 * l_grant_lock. Don't worry about iclog's lsn.
2242 * No one else can be here except us.
2244 spin_lock(&log
->l_grant_lock
);
2245 ASSERT(XFS_LSN_CMP(log
->l_last_sync_lsn
,
2246 be64_to_cpu(iclog
->ic_header
.h_lsn
)) <= 0);
2247 log
->l_last_sync_lsn
=
2248 be64_to_cpu(iclog
->ic_header
.h_lsn
);
2249 spin_unlock(&log
->l_grant_lock
);
2252 spin_unlock(&log
->l_icloglock
);
2257 * Keep processing entries in the callback list until
2258 * we come around and it is empty. We need to
2259 * atomically see that the list is empty and change the
2260 * state to DIRTY so that we don't miss any more
2261 * callbacks being added.
2263 spin_lock(&iclog
->ic_callback_lock
);
2264 cb
= iclog
->ic_callback
;
2266 iclog
->ic_callback_tail
= &(iclog
->ic_callback
);
2267 iclog
->ic_callback
= NULL
;
2268 spin_unlock(&iclog
->ic_callback_lock
);
2270 /* perform callbacks in the order given */
2271 for (; cb
; cb
= cb_next
) {
2272 cb_next
= cb
->cb_next
;
2273 cb
->cb_func(cb
->cb_arg
, aborted
);
2275 spin_lock(&iclog
->ic_callback_lock
);
2276 cb
= iclog
->ic_callback
;
2282 spin_lock(&log
->l_icloglock
);
2283 ASSERT(iclog
->ic_callback
== NULL
);
2284 spin_unlock(&iclog
->ic_callback_lock
);
2285 if (!(iclog
->ic_state
& XLOG_STATE_IOERROR
))
2286 iclog
->ic_state
= XLOG_STATE_DIRTY
;
2289 * Transition from DIRTY to ACTIVE if applicable.
2290 * NOP if STATE_IOERROR.
2292 xlog_state_clean_log(log
);
2294 /* wake up threads waiting in xfs_log_force() */
2295 sv_broadcast(&iclog
->ic_force_wait
);
2297 iclog
= iclog
->ic_next
;
2298 } while (first_iclog
!= iclog
);
2300 if (repeats
> 5000) {
2301 flushcnt
+= repeats
;
2303 xfs_fs_cmn_err(CE_WARN
, log
->l_mp
,
2304 "%s: possible infinite loop (%d iterations)",
2305 __func__
, flushcnt
);
2307 } while (!ioerrors
&& loopdidcallbacks
);
2310 * make one last gasp attempt to see if iclogs are being left in
2314 if (funcdidcallbacks
) {
2315 first_iclog
= iclog
= log
->l_iclog
;
2317 ASSERT(iclog
->ic_state
!= XLOG_STATE_DO_CALLBACK
);
2319 * Terminate the loop if iclogs are found in states
2320 * which will cause other threads to clean up iclogs.
2322 * SYNCING - i/o completion will go through logs
2323 * DONE_SYNC - interrupt thread should be waiting for
2325 * IOERROR - give up hope all ye who enter here
2327 if (iclog
->ic_state
== XLOG_STATE_WANT_SYNC
||
2328 iclog
->ic_state
== XLOG_STATE_SYNCING
||
2329 iclog
->ic_state
== XLOG_STATE_DONE_SYNC
||
2330 iclog
->ic_state
== XLOG_STATE_IOERROR
)
2332 iclog
= iclog
->ic_next
;
2333 } while (first_iclog
!= iclog
);
2337 if (log
->l_iclog
->ic_state
& (XLOG_STATE_ACTIVE
|XLOG_STATE_IOERROR
))
2339 spin_unlock(&log
->l_icloglock
);
2342 sv_broadcast(&log
->l_flush_wait
);
2347 * Finish transitioning this iclog to the dirty state.
2349 * Make sure that we completely execute this routine only when this is
2350 * the last call to the iclog. There is a good chance that iclog flushes,
2351 * when we reach the end of the physical log, get turned into 2 separate
2352 * calls to bwrite. Hence, one iclog flush could generate two calls to this
2353 * routine. By using the reference count bwritecnt, we guarantee that only
2354 * the second completion goes through.
2356 * Callbacks could take time, so they are done outside the scope of the
2357 * global state machine log lock.
2360 xlog_state_done_syncing(
2361 xlog_in_core_t
*iclog
,
2364 xlog_t
*log
= iclog
->ic_log
;
2366 spin_lock(&log
->l_icloglock
);
2368 ASSERT(iclog
->ic_state
== XLOG_STATE_SYNCING
||
2369 iclog
->ic_state
== XLOG_STATE_IOERROR
);
2370 ASSERT(atomic_read(&iclog
->ic_refcnt
) == 0);
2371 ASSERT(iclog
->ic_bwritecnt
== 1 || iclog
->ic_bwritecnt
== 2);
2375 * If we got an error, either on the first buffer, or in the case of
2376 * split log writes, on the second, we mark ALL iclogs STATE_IOERROR,
2377 * and none should ever be attempted to be written to disk
2380 if (iclog
->ic_state
!= XLOG_STATE_IOERROR
) {
2381 if (--iclog
->ic_bwritecnt
== 1) {
2382 spin_unlock(&log
->l_icloglock
);
2385 iclog
->ic_state
= XLOG_STATE_DONE_SYNC
;
2389 * Someone could be sleeping prior to writing out the next
2390 * iclog buffer, we wake them all, one will get to do the
2391 * I/O, the others get to wait for the result.
2393 sv_broadcast(&iclog
->ic_write_wait
);
2394 spin_unlock(&log
->l_icloglock
);
2395 xlog_state_do_callback(log
, aborted
, iclog
); /* also cleans log */
2396 } /* xlog_state_done_syncing */
2400 * If the head of the in-core log ring is not (ACTIVE or DIRTY), then we must
2401 * sleep. We wait on the flush queue on the head iclog as that should be
2402 * the first iclog to complete flushing. Hence if all iclogs are syncing,
2403 * we will wait here and all new writes will sleep until a sync completes.
2405 * The in-core logs are used in a circular fashion. They are not used
2406 * out-of-order even when an iclog past the head is free.
2409 * * log_offset where xlog_write() can start writing into the in-core
2411 * * in-core log pointer to which xlog_write() should write.
2412 * * boolean indicating this is a continued write to an in-core log.
2413 * If this is the last write, then the in-core log's offset field
2414 * needs to be incremented, depending on the amount of data which
2418 xlog_state_get_iclog_space(xlog_t
*log
,
2420 xlog_in_core_t
**iclogp
,
2421 xlog_ticket_t
*ticket
,
2422 int *continued_write
,
2426 xlog_rec_header_t
*head
;
2427 xlog_in_core_t
*iclog
;
2431 spin_lock(&log
->l_icloglock
);
2432 if (XLOG_FORCED_SHUTDOWN(log
)) {
2433 spin_unlock(&log
->l_icloglock
);
2434 return XFS_ERROR(EIO
);
2437 iclog
= log
->l_iclog
;
2438 if (iclog
->ic_state
!= XLOG_STATE_ACTIVE
) {
2439 XFS_STATS_INC(xs_log_noiclogs
);
2441 /* Wait for log writes to have flushed */
2442 sv_wait(&log
->l_flush_wait
, 0, &log
->l_icloglock
, 0);
2446 head
= &iclog
->ic_header
;
2448 atomic_inc(&iclog
->ic_refcnt
); /* prevents sync */
2449 log_offset
= iclog
->ic_offset
;
2451 /* On the 1st write to an iclog, figure out lsn. This works
2452 * if iclogs marked XLOG_STATE_WANT_SYNC always write out what they are
2453 * committing to. If the offset is set, that's how many blocks
2456 if (log_offset
== 0) {
2457 ticket
->t_curr_res
-= log
->l_iclog_hsize
;
2458 xlog_tic_add_region(ticket
,
2460 XLOG_REG_TYPE_LRHEADER
);
2461 head
->h_cycle
= cpu_to_be32(log
->l_curr_cycle
);
2462 head
->h_lsn
= cpu_to_be64(
2463 xlog_assign_lsn(log
->l_curr_cycle
, log
->l_curr_block
));
2464 ASSERT(log
->l_curr_block
>= 0);
2467 /* If there is enough room to write everything, then do it. Otherwise,
2468 * claim the rest of the region and make sure the XLOG_STATE_WANT_SYNC
2469 * bit is on, so this will get flushed out. Don't update ic_offset
2470 * until you know exactly how many bytes get copied. Therefore, wait
2471 * until later to update ic_offset.
2473 * xlog_write() algorithm assumes that at least 2 xlog_op_header_t's
2474 * can fit into remaining data section.
2476 if (iclog
->ic_size
- iclog
->ic_offset
< 2*sizeof(xlog_op_header_t
)) {
2477 xlog_state_switch_iclogs(log
, iclog
, iclog
->ic_size
);
2480 * If I'm the only one writing to this iclog, sync it to disk.
2481 * We need to do an atomic compare and decrement here to avoid
2482 * racing with concurrent atomic_dec_and_lock() calls in
2483 * xlog_state_release_iclog() when there is more than one
2484 * reference to the iclog.
2486 if (!atomic_add_unless(&iclog
->ic_refcnt
, -1, 1)) {
2487 /* we are the only one */
2488 spin_unlock(&log
->l_icloglock
);
2489 error
= xlog_state_release_iclog(log
, iclog
);
2493 spin_unlock(&log
->l_icloglock
);
2498 /* Do we have enough room to write the full amount in the remainder
2499 * of this iclog? Or must we continue a write on the next iclog and
2500 * mark this iclog as completely taken? In the case where we switch
2501 * iclogs (to mark it taken), this particular iclog will release/sync
2502 * to disk in xlog_write().
2504 if (len
<= iclog
->ic_size
- iclog
->ic_offset
) {
2505 *continued_write
= 0;
2506 iclog
->ic_offset
+= len
;
2508 *continued_write
= 1;
2509 xlog_state_switch_iclogs(log
, iclog
, iclog
->ic_size
);
2513 ASSERT(iclog
->ic_offset
<= iclog
->ic_size
);
2514 spin_unlock(&log
->l_icloglock
);
2516 *logoffsetp
= log_offset
;
2518 } /* xlog_state_get_iclog_space */
2521 * Atomically get the log space required for a log ticket.
2523 * Once a ticket gets put onto the reserveq, it will only return after
2524 * the needed reservation is satisfied.
2527 xlog_grant_log_space(xlog_t
*log
,
2538 if (log
->l_flags
& XLOG_ACTIVE_RECOVERY
)
2539 panic("grant Recovery problem");
2542 /* Is there space or do we need to sleep? */
2543 spin_lock(&log
->l_grant_lock
);
2545 trace_xfs_log_grant_enter(log
, tic
);
2547 /* something is already sleeping; insert new transaction at end */
2548 if (log
->l_reserve_headq
) {
2549 xlog_ins_ticketq(&log
->l_reserve_headq
, tic
);
2551 trace_xfs_log_grant_sleep1(log
, tic
);
2554 * Gotta check this before going to sleep, while we're
2555 * holding the grant lock.
2557 if (XLOG_FORCED_SHUTDOWN(log
))
2560 XFS_STATS_INC(xs_sleep_logspace
);
2561 sv_wait(&tic
->t_wait
, PINOD
|PLTWAIT
, &log
->l_grant_lock
, s
);
2563 * If we got an error, and the filesystem is shutting down,
2564 * we'll catch it down below. So just continue...
2566 trace_xfs_log_grant_wake1(log
, tic
);
2567 spin_lock(&log
->l_grant_lock
);
2569 if (tic
->t_flags
& XFS_LOG_PERM_RESERV
)
2570 need_bytes
= tic
->t_unit_res
*tic
->t_ocnt
;
2572 need_bytes
= tic
->t_unit_res
;
2575 if (XLOG_FORCED_SHUTDOWN(log
))
2578 free_bytes
= xlog_space_left(log
, log
->l_grant_reserve_cycle
,
2579 log
->l_grant_reserve_bytes
);
2580 if (free_bytes
< need_bytes
) {
2581 if ((tic
->t_flags
& XLOG_TIC_IN_Q
) == 0)
2582 xlog_ins_ticketq(&log
->l_reserve_headq
, tic
);
2584 trace_xfs_log_grant_sleep2(log
, tic
);
2586 spin_unlock(&log
->l_grant_lock
);
2587 xlog_grant_push_ail(log
->l_mp
, need_bytes
);
2588 spin_lock(&log
->l_grant_lock
);
2590 XFS_STATS_INC(xs_sleep_logspace
);
2591 sv_wait(&tic
->t_wait
, PINOD
|PLTWAIT
, &log
->l_grant_lock
, s
);
2593 spin_lock(&log
->l_grant_lock
);
2594 if (XLOG_FORCED_SHUTDOWN(log
))
2597 trace_xfs_log_grant_wake2(log
, tic
);
2600 } else if (tic
->t_flags
& XLOG_TIC_IN_Q
)
2601 xlog_del_ticketq(&log
->l_reserve_headq
, tic
);
2603 /* we've got enough space */
2604 xlog_grant_add_space(log
, need_bytes
);
2606 tail_lsn
= log
->l_tail_lsn
;
2608 * Check to make sure the grant write head didn't just over lap the
2609 * tail. If the cycles are the same, we can't be overlapping.
2610 * Otherwise, make sure that the cycles differ by exactly one and
2611 * check the byte count.
2613 if (CYCLE_LSN(tail_lsn
) != log
->l_grant_write_cycle
) {
2614 ASSERT(log
->l_grant_write_cycle
-1 == CYCLE_LSN(tail_lsn
));
2615 ASSERT(log
->l_grant_write_bytes
<= BBTOB(BLOCK_LSN(tail_lsn
)));
2618 trace_xfs_log_grant_exit(log
, tic
);
2619 xlog_verify_grant_head(log
, 1);
2620 spin_unlock(&log
->l_grant_lock
);
2624 if (tic
->t_flags
& XLOG_TIC_IN_Q
)
2625 xlog_del_ticketq(&log
->l_reserve_headq
, tic
);
2627 trace_xfs_log_grant_error(log
, tic
);
2630 * If we are failing, make sure the ticket doesn't have any
2631 * current reservations. We don't want to add this back when
2632 * the ticket/transaction gets cancelled.
2634 tic
->t_curr_res
= 0;
2635 tic
->t_cnt
= 0; /* ungrant will give back unit_res * t_cnt. */
2636 spin_unlock(&log
->l_grant_lock
);
2637 return XFS_ERROR(EIO
);
2638 } /* xlog_grant_log_space */
2642 * Replenish the byte reservation required by moving the grant write head.
2647 xlog_regrant_write_log_space(xlog_t
*log
,
2650 int free_bytes
, need_bytes
;
2651 xlog_ticket_t
*ntic
;
2656 tic
->t_curr_res
= tic
->t_unit_res
;
2657 xlog_tic_reset_res(tic
);
2663 if (log
->l_flags
& XLOG_ACTIVE_RECOVERY
)
2664 panic("regrant Recovery problem");
2667 spin_lock(&log
->l_grant_lock
);
2669 trace_xfs_log_regrant_write_enter(log
, tic
);
2671 if (XLOG_FORCED_SHUTDOWN(log
))
2674 /* If there are other waiters on the queue then give them a
2675 * chance at logspace before us. Wake up the first waiters,
2676 * if we do not wake up all the waiters then go to sleep waiting
2677 * for more free space, otherwise try to get some space for
2680 need_bytes
= tic
->t_unit_res
;
2681 if ((ntic
= log
->l_write_headq
)) {
2682 free_bytes
= xlog_space_left(log
, log
->l_grant_write_cycle
,
2683 log
->l_grant_write_bytes
);
2685 ASSERT(ntic
->t_flags
& XLOG_TIC_PERM_RESERV
);
2687 if (free_bytes
< ntic
->t_unit_res
)
2689 free_bytes
-= ntic
->t_unit_res
;
2690 sv_signal(&ntic
->t_wait
);
2691 ntic
= ntic
->t_next
;
2692 } while (ntic
!= log
->l_write_headq
);
2694 if (ntic
!= log
->l_write_headq
) {
2695 if ((tic
->t_flags
& XLOG_TIC_IN_Q
) == 0)
2696 xlog_ins_ticketq(&log
->l_write_headq
, tic
);
2698 trace_xfs_log_regrant_write_sleep1(log
, tic
);
2700 spin_unlock(&log
->l_grant_lock
);
2701 xlog_grant_push_ail(log
->l_mp
, need_bytes
);
2702 spin_lock(&log
->l_grant_lock
);
2704 XFS_STATS_INC(xs_sleep_logspace
);
2705 sv_wait(&tic
->t_wait
, PINOD
|PLTWAIT
,
2706 &log
->l_grant_lock
, s
);
2708 /* If we're shutting down, this tic is already
2710 spin_lock(&log
->l_grant_lock
);
2711 if (XLOG_FORCED_SHUTDOWN(log
))
2714 trace_xfs_log_regrant_write_wake1(log
, tic
);
2719 if (XLOG_FORCED_SHUTDOWN(log
))
2722 free_bytes
= xlog_space_left(log
, log
->l_grant_write_cycle
,
2723 log
->l_grant_write_bytes
);
2724 if (free_bytes
< need_bytes
) {
2725 if ((tic
->t_flags
& XLOG_TIC_IN_Q
) == 0)
2726 xlog_ins_ticketq(&log
->l_write_headq
, tic
);
2727 spin_unlock(&log
->l_grant_lock
);
2728 xlog_grant_push_ail(log
->l_mp
, need_bytes
);
2729 spin_lock(&log
->l_grant_lock
);
2731 XFS_STATS_INC(xs_sleep_logspace
);
2732 trace_xfs_log_regrant_write_sleep2(log
, tic
);
2734 sv_wait(&tic
->t_wait
, PINOD
|PLTWAIT
, &log
->l_grant_lock
, s
);
2736 /* If we're shutting down, this tic is already off the queue */
2737 spin_lock(&log
->l_grant_lock
);
2738 if (XLOG_FORCED_SHUTDOWN(log
))
2741 trace_xfs_log_regrant_write_wake2(log
, tic
);
2743 } else if (tic
->t_flags
& XLOG_TIC_IN_Q
)
2744 xlog_del_ticketq(&log
->l_write_headq
, tic
);
2746 /* we've got enough space */
2747 xlog_grant_add_space_write(log
, need_bytes
);
2749 tail_lsn
= log
->l_tail_lsn
;
2750 if (CYCLE_LSN(tail_lsn
) != log
->l_grant_write_cycle
) {
2751 ASSERT(log
->l_grant_write_cycle
-1 == CYCLE_LSN(tail_lsn
));
2752 ASSERT(log
->l_grant_write_bytes
<= BBTOB(BLOCK_LSN(tail_lsn
)));
2756 trace_xfs_log_regrant_write_exit(log
, tic
);
2758 xlog_verify_grant_head(log
, 1);
2759 spin_unlock(&log
->l_grant_lock
);
2764 if (tic
->t_flags
& XLOG_TIC_IN_Q
)
2765 xlog_del_ticketq(&log
->l_reserve_headq
, tic
);
2767 trace_xfs_log_regrant_write_error(log
, tic
);
2770 * If we are failing, make sure the ticket doesn't have any
2771 * current reservations. We don't want to add this back when
2772 * the ticket/transaction gets cancelled.
2774 tic
->t_curr_res
= 0;
2775 tic
->t_cnt
= 0; /* ungrant will give back unit_res * t_cnt. */
2776 spin_unlock(&log
->l_grant_lock
);
2777 return XFS_ERROR(EIO
);
2778 } /* xlog_regrant_write_log_space */
2781 /* The first cnt-1 times through here we don't need to
2782 * move the grant write head because the permanent
2783 * reservation has reserved cnt times the unit amount.
2784 * Release part of current permanent unit reservation and
2785 * reset current reservation to be one units worth. Also
2786 * move grant reservation head forward.
2789 xlog_regrant_reserve_log_space(xlog_t
*log
,
2790 xlog_ticket_t
*ticket
)
2792 trace_xfs_log_regrant_reserve_enter(log
, ticket
);
2794 if (ticket
->t_cnt
> 0)
2797 spin_lock(&log
->l_grant_lock
);
2798 xlog_grant_sub_space(log
, ticket
->t_curr_res
);
2799 ticket
->t_curr_res
= ticket
->t_unit_res
;
2800 xlog_tic_reset_res(ticket
);
2802 trace_xfs_log_regrant_reserve_sub(log
, ticket
);
2804 xlog_verify_grant_head(log
, 1);
2806 /* just return if we still have some of the pre-reserved space */
2807 if (ticket
->t_cnt
> 0) {
2808 spin_unlock(&log
->l_grant_lock
);
2812 xlog_grant_add_space_reserve(log
, ticket
->t_unit_res
);
2814 trace_xfs_log_regrant_reserve_exit(log
, ticket
);
2816 xlog_verify_grant_head(log
, 0);
2817 spin_unlock(&log
->l_grant_lock
);
2818 ticket
->t_curr_res
= ticket
->t_unit_res
;
2819 xlog_tic_reset_res(ticket
);
2820 } /* xlog_regrant_reserve_log_space */
2824 * Give back the space left from a reservation.
2826 * All the information we need to make a correct determination of space left
2827 * is present. For non-permanent reservations, things are quite easy. The
2828 * count should have been decremented to zero. We only need to deal with the
2829 * space remaining in the current reservation part of the ticket. If the
2830 * ticket contains a permanent reservation, there may be left over space which
2831 * needs to be released. A count of N means that N-1 refills of the current
2832 * reservation can be done before we need to ask for more space. The first
2833 * one goes to fill up the first current reservation. Once we run out of
2834 * space, the count will stay at zero and the only space remaining will be
2835 * in the current reservation field.
2838 xlog_ungrant_log_space(xlog_t
*log
,
2839 xlog_ticket_t
*ticket
)
2841 if (ticket
->t_cnt
> 0)
2844 spin_lock(&log
->l_grant_lock
);
2845 trace_xfs_log_ungrant_enter(log
, ticket
);
2847 xlog_grant_sub_space(log
, ticket
->t_curr_res
);
2849 trace_xfs_log_ungrant_sub(log
, ticket
);
2851 /* If this is a permanent reservation ticket, we may be able to free
2852 * up more space based on the remaining count.
2854 if (ticket
->t_cnt
> 0) {
2855 ASSERT(ticket
->t_flags
& XLOG_TIC_PERM_RESERV
);
2856 xlog_grant_sub_space(log
, ticket
->t_unit_res
*ticket
->t_cnt
);
2859 trace_xfs_log_ungrant_exit(log
, ticket
);
2861 xlog_verify_grant_head(log
, 1);
2862 spin_unlock(&log
->l_grant_lock
);
2863 xfs_log_move_tail(log
->l_mp
, 1);
2864 } /* xlog_ungrant_log_space */
2868 * Flush iclog to disk if this is the last reference to the given iclog and
2869 * the WANT_SYNC bit is set.
2871 * When this function is entered, the iclog is not necessarily in the
2872 * WANT_SYNC state. It may be sitting around waiting to get filled.
2877 xlog_state_release_iclog(
2879 xlog_in_core_t
*iclog
)
2881 int sync
= 0; /* do we sync? */
2883 if (iclog
->ic_state
& XLOG_STATE_IOERROR
)
2884 return XFS_ERROR(EIO
);
2886 ASSERT(atomic_read(&iclog
->ic_refcnt
) > 0);
2887 if (!atomic_dec_and_lock(&iclog
->ic_refcnt
, &log
->l_icloglock
))
2890 if (iclog
->ic_state
& XLOG_STATE_IOERROR
) {
2891 spin_unlock(&log
->l_icloglock
);
2892 return XFS_ERROR(EIO
);
2894 ASSERT(iclog
->ic_state
== XLOG_STATE_ACTIVE
||
2895 iclog
->ic_state
== XLOG_STATE_WANT_SYNC
);
2897 if (iclog
->ic_state
== XLOG_STATE_WANT_SYNC
) {
2898 /* update tail before writing to iclog */
2899 xlog_assign_tail_lsn(log
->l_mp
);
2901 iclog
->ic_state
= XLOG_STATE_SYNCING
;
2902 iclog
->ic_header
.h_tail_lsn
= cpu_to_be64(log
->l_tail_lsn
);
2903 xlog_verify_tail_lsn(log
, iclog
, log
->l_tail_lsn
);
2904 /* cycle incremented when incrementing curr_block */
2906 spin_unlock(&log
->l_icloglock
);
2909 * We let the log lock go, so it's possible that we hit a log I/O
2910 * error or some other SHUTDOWN condition that marks the iclog
2911 * as XLOG_STATE_IOERROR before the bwrite. However, we know that
2912 * this iclog has consistent data, so we ignore IOERROR
2913 * flags after this point.
2916 return xlog_sync(log
, iclog
);
2918 } /* xlog_state_release_iclog */
2922 * This routine will mark the current iclog in the ring as WANT_SYNC
2923 * and move the current iclog pointer to the next iclog in the ring.
2924 * When this routine is called from xlog_state_get_iclog_space(), the
2925 * exact size of the iclog has not yet been determined. All we know is
2926 * that every data block. We have run out of space in this log record.
2929 xlog_state_switch_iclogs(xlog_t
*log
,
2930 xlog_in_core_t
*iclog
,
2933 ASSERT(iclog
->ic_state
== XLOG_STATE_ACTIVE
);
2935 eventual_size
= iclog
->ic_offset
;
2936 iclog
->ic_state
= XLOG_STATE_WANT_SYNC
;
2937 iclog
->ic_header
.h_prev_block
= cpu_to_be32(log
->l_prev_block
);
2938 log
->l_prev_block
= log
->l_curr_block
;
2939 log
->l_prev_cycle
= log
->l_curr_cycle
;
2941 /* roll log?: ic_offset changed later */
2942 log
->l_curr_block
+= BTOBB(eventual_size
)+BTOBB(log
->l_iclog_hsize
);
2944 /* Round up to next log-sunit */
2945 if (xfs_sb_version_haslogv2(&log
->l_mp
->m_sb
) &&
2946 log
->l_mp
->m_sb
.sb_logsunit
> 1) {
2947 __uint32_t sunit_bb
= BTOBB(log
->l_mp
->m_sb
.sb_logsunit
);
2948 log
->l_curr_block
= roundup(log
->l_curr_block
, sunit_bb
);
2951 if (log
->l_curr_block
>= log
->l_logBBsize
) {
2952 log
->l_curr_cycle
++;
2953 if (log
->l_curr_cycle
== XLOG_HEADER_MAGIC_NUM
)
2954 log
->l_curr_cycle
++;
2955 log
->l_curr_block
-= log
->l_logBBsize
;
2956 ASSERT(log
->l_curr_block
>= 0);
2958 ASSERT(iclog
== log
->l_iclog
);
2959 log
->l_iclog
= iclog
->ic_next
;
2960 } /* xlog_state_switch_iclogs */
2963 * Write out all data in the in-core log as of this exact moment in time.
2965 * Data may be written to the in-core log during this call. However,
2966 * we don't guarantee this data will be written out. A change from past
2967 * implementation means this routine will *not* write out zero length LRs.
2969 * Basically, we try and perform an intelligent scan of the in-core logs.
2970 * If we determine there is no flushable data, we just return. There is no
2971 * flushable data if:
2973 * 1. the current iclog is active and has no data; the previous iclog
2974 * is in the active or dirty state.
2975 * 2. the current iclog is drity, and the previous iclog is in the
2976 * active or dirty state.
2980 * 1. the current iclog is not in the active nor dirty state.
2981 * 2. the current iclog dirty, and the previous iclog is not in the
2982 * active nor dirty state.
2983 * 3. the current iclog is active, and there is another thread writing
2984 * to this particular iclog.
2985 * 4. a) the current iclog is active and has no other writers
2986 * b) when we return from flushing out this iclog, it is still
2987 * not in the active nor dirty state.
2991 struct xfs_mount
*mp
,
2995 struct log
*log
= mp
->m_log
;
2996 struct xlog_in_core
*iclog
;
2999 XFS_STATS_INC(xs_log_force
);
3001 spin_lock(&log
->l_icloglock
);
3003 iclog
= log
->l_iclog
;
3004 if (iclog
->ic_state
& XLOG_STATE_IOERROR
) {
3005 spin_unlock(&log
->l_icloglock
);
3006 return XFS_ERROR(EIO
);
3009 /* If the head iclog is not active nor dirty, we just attach
3010 * ourselves to the head and go to sleep.
3012 if (iclog
->ic_state
== XLOG_STATE_ACTIVE
||
3013 iclog
->ic_state
== XLOG_STATE_DIRTY
) {
3015 * If the head is dirty or (active and empty), then
3016 * we need to look at the previous iclog. If the previous
3017 * iclog is active or dirty we are done. There is nothing
3018 * to sync out. Otherwise, we attach ourselves to the
3019 * previous iclog and go to sleep.
3021 if (iclog
->ic_state
== XLOG_STATE_DIRTY
||
3022 (atomic_read(&iclog
->ic_refcnt
) == 0
3023 && iclog
->ic_offset
== 0)) {
3024 iclog
= iclog
->ic_prev
;
3025 if (iclog
->ic_state
== XLOG_STATE_ACTIVE
||
3026 iclog
->ic_state
== XLOG_STATE_DIRTY
)
3031 if (atomic_read(&iclog
->ic_refcnt
) == 0) {
3032 /* We are the only one with access to this
3033 * iclog. Flush it out now. There should
3034 * be a roundoff of zero to show that someone
3035 * has already taken care of the roundoff from
3036 * the previous sync.
3038 atomic_inc(&iclog
->ic_refcnt
);
3039 lsn
= be64_to_cpu(iclog
->ic_header
.h_lsn
);
3040 xlog_state_switch_iclogs(log
, iclog
, 0);
3041 spin_unlock(&log
->l_icloglock
);
3043 if (xlog_state_release_iclog(log
, iclog
))
3044 return XFS_ERROR(EIO
);
3048 spin_lock(&log
->l_icloglock
);
3049 if (be64_to_cpu(iclog
->ic_header
.h_lsn
) == lsn
&&
3050 iclog
->ic_state
!= XLOG_STATE_DIRTY
)
3055 /* Someone else is writing to this iclog.
3056 * Use its call to flush out the data. However,
3057 * the other thread may not force out this LR,
3058 * so we mark it WANT_SYNC.
3060 xlog_state_switch_iclogs(log
, iclog
, 0);
3066 /* By the time we come around again, the iclog could've been filled
3067 * which would give it another lsn. If we have a new lsn, just
3068 * return because the relevant data has been flushed.
3071 if (flags
& XFS_LOG_SYNC
) {
3073 * We must check if we're shutting down here, before
3074 * we wait, while we're holding the l_icloglock.
3075 * Then we check again after waking up, in case our
3076 * sleep was disturbed by a bad news.
3078 if (iclog
->ic_state
& XLOG_STATE_IOERROR
) {
3079 spin_unlock(&log
->l_icloglock
);
3080 return XFS_ERROR(EIO
);
3082 XFS_STATS_INC(xs_log_force_sleep
);
3083 sv_wait(&iclog
->ic_force_wait
, PINOD
, &log
->l_icloglock
, s
);
3085 * No need to grab the log lock here since we're
3086 * only deciding whether or not to return EIO
3087 * and the memory read should be atomic.
3089 if (iclog
->ic_state
& XLOG_STATE_IOERROR
)
3090 return XFS_ERROR(EIO
);
3096 spin_unlock(&log
->l_icloglock
);
3102 * Wrapper for _xfs_log_force(), to be used when caller doesn't care
3103 * about errors or whether the log was flushed or not. This is the normal
3104 * interface to use when trying to unpin items or move the log forward.
3113 error
= _xfs_log_force(mp
, flags
, NULL
);
3115 xfs_fs_cmn_err(CE_WARN
, mp
, "xfs_log_force: "
3116 "error %d returned.", error
);
3121 * Force the in-core log to disk for a specific LSN.
3123 * Find in-core log with lsn.
3124 * If it is in the DIRTY state, just return.
3125 * If it is in the ACTIVE state, move the in-core log into the WANT_SYNC
3126 * state and go to sleep or return.
3127 * If it is in any other state, go to sleep or return.
3129 * Synchronous forces are implemented with a signal variable. All callers
3130 * to force a given lsn to disk will wait on a the sv attached to the
3131 * specific in-core log. When given in-core log finally completes its
3132 * write to disk, that thread will wake up all threads waiting on the
3137 struct xfs_mount
*mp
,
3142 struct log
*log
= mp
->m_log
;
3143 struct xlog_in_core
*iclog
;
3144 int already_slept
= 0;
3148 XFS_STATS_INC(xs_log_force
);
3151 spin_lock(&log
->l_icloglock
);
3152 iclog
= log
->l_iclog
;
3153 if (iclog
->ic_state
& XLOG_STATE_IOERROR
) {
3154 spin_unlock(&log
->l_icloglock
);
3155 return XFS_ERROR(EIO
);
3159 if (be64_to_cpu(iclog
->ic_header
.h_lsn
) != lsn
) {
3160 iclog
= iclog
->ic_next
;
3164 if (iclog
->ic_state
== XLOG_STATE_DIRTY
) {
3165 spin_unlock(&log
->l_icloglock
);
3169 if (iclog
->ic_state
== XLOG_STATE_ACTIVE
) {
3171 * We sleep here if we haven't already slept (e.g.
3172 * this is the first time we've looked at the correct
3173 * iclog buf) and the buffer before us is going to
3174 * be sync'ed. The reason for this is that if we
3175 * are doing sync transactions here, by waiting for
3176 * the previous I/O to complete, we can allow a few
3177 * more transactions into this iclog before we close
3180 * Otherwise, we mark the buffer WANT_SYNC, and bump
3181 * up the refcnt so we can release the log (which
3182 * drops the ref count). The state switch keeps new
3183 * transaction commits from using this buffer. When
3184 * the current commits finish writing into the buffer,
3185 * the refcount will drop to zero and the buffer will
3188 if (!already_slept
&&
3189 (iclog
->ic_prev
->ic_state
&
3190 (XLOG_STATE_WANT_SYNC
| XLOG_STATE_SYNCING
))) {
3191 ASSERT(!(iclog
->ic_state
& XLOG_STATE_IOERROR
));
3193 XFS_STATS_INC(xs_log_force_sleep
);
3195 sv_wait(&iclog
->ic_prev
->ic_write_wait
,
3196 PSWP
, &log
->l_icloglock
, s
);
3202 atomic_inc(&iclog
->ic_refcnt
);
3203 xlog_state_switch_iclogs(log
, iclog
, 0);
3204 spin_unlock(&log
->l_icloglock
);
3205 if (xlog_state_release_iclog(log
, iclog
))
3206 return XFS_ERROR(EIO
);
3209 spin_lock(&log
->l_icloglock
);
3212 if ((flags
& XFS_LOG_SYNC
) && /* sleep */
3214 (XLOG_STATE_ACTIVE
| XLOG_STATE_DIRTY
))) {
3216 * Don't wait on completion if we know that we've
3217 * gotten a log write error.
3219 if (iclog
->ic_state
& XLOG_STATE_IOERROR
) {
3220 spin_unlock(&log
->l_icloglock
);
3221 return XFS_ERROR(EIO
);
3223 XFS_STATS_INC(xs_log_force_sleep
);
3224 sv_wait(&iclog
->ic_force_wait
, PSWP
, &log
->l_icloglock
, s
);
3226 * No need to grab the log lock here since we're
3227 * only deciding whether or not to return EIO
3228 * and the memory read should be atomic.
3230 if (iclog
->ic_state
& XLOG_STATE_IOERROR
)
3231 return XFS_ERROR(EIO
);
3235 } else { /* just return */
3236 spin_unlock(&log
->l_icloglock
);
3240 } while (iclog
!= log
->l_iclog
);
3242 spin_unlock(&log
->l_icloglock
);
3247 * Wrapper for _xfs_log_force_lsn(), to be used when caller doesn't care
3248 * about errors or whether the log was flushed or not. This is the normal
3249 * interface to use when trying to unpin items or move the log forward.
3259 error
= _xfs_log_force_lsn(mp
, lsn
, flags
, NULL
);
3261 xfs_fs_cmn_err(CE_WARN
, mp
, "xfs_log_force: "
3262 "error %d returned.", error
);
3267 * Called when we want to mark the current iclog as being ready to sync to
3271 xlog_state_want_sync(xlog_t
*log
, xlog_in_core_t
*iclog
)
3273 assert_spin_locked(&log
->l_icloglock
);
3275 if (iclog
->ic_state
== XLOG_STATE_ACTIVE
) {
3276 xlog_state_switch_iclogs(log
, iclog
, 0);
3278 ASSERT(iclog
->ic_state
&
3279 (XLOG_STATE_WANT_SYNC
|XLOG_STATE_IOERROR
));
3284 /*****************************************************************************
3288 *****************************************************************************
3292 * Free a used ticket when its refcount falls to zero.
3296 xlog_ticket_t
*ticket
)
3298 ASSERT(atomic_read(&ticket
->t_ref
) > 0);
3299 if (atomic_dec_and_test(&ticket
->t_ref
)) {
3300 sv_destroy(&ticket
->t_wait
);
3301 kmem_zone_free(xfs_log_ticket_zone
, ticket
);
3307 xlog_ticket_t
*ticket
)
3309 ASSERT(atomic_read(&ticket
->t_ref
) > 0);
3310 atomic_inc(&ticket
->t_ref
);
3315 * Allocate and initialise a new log ticket.
3317 STATIC xlog_ticket_t
*
3325 struct xlog_ticket
*tic
;
3329 tic
= kmem_zone_zalloc(xfs_log_ticket_zone
, KM_SLEEP
|KM_MAYFAIL
);
3334 * Permanent reservations have up to 'cnt'-1 active log operations
3335 * in the log. A unit in this case is the amount of space for one
3336 * of these log operations. Normal reservations have a cnt of 1
3337 * and their unit amount is the total amount of space required.
3339 * The following lines of code account for non-transaction data
3340 * which occupy space in the on-disk log.
3342 * Normal form of a transaction is:
3343 * <oph><trans-hdr><start-oph><reg1-oph><reg1><reg2-oph>...<commit-oph>
3344 * and then there are LR hdrs, split-recs and roundoff at end of syncs.
3346 * We need to account for all the leadup data and trailer data
3347 * around the transaction data.
3348 * And then we need to account for the worst case in terms of using
3350 * The worst case will happen if:
3351 * - the placement of the transaction happens to be such that the
3352 * roundoff is at its maximum
3353 * - the transaction data is synced before the commit record is synced
3354 * i.e. <transaction-data><roundoff> | <commit-rec><roundoff>
3355 * Therefore the commit record is in its own Log Record.
3356 * This can happen as the commit record is called with its
3357 * own region to xlog_write().
3358 * This then means that in the worst case, roundoff can happen for
3359 * the commit-rec as well.
3360 * The commit-rec is smaller than padding in this scenario and so it is
3361 * not added separately.
3364 /* for trans header */
3365 unit_bytes
+= sizeof(xlog_op_header_t
);
3366 unit_bytes
+= sizeof(xfs_trans_header_t
);
3369 unit_bytes
+= sizeof(xlog_op_header_t
);
3372 * for LR headers - the space for data in an iclog is the size minus
3373 * the space used for the headers. If we use the iclog size, then we
3374 * undercalculate the number of headers required.
3376 * Furthermore - the addition of op headers for split-recs might
3377 * increase the space required enough to require more log and op
3378 * headers, so take that into account too.
3380 * IMPORTANT: This reservation makes the assumption that if this
3381 * transaction is the first in an iclog and hence has the LR headers
3382 * accounted to it, then the remaining space in the iclog is
3383 * exclusively for this transaction. i.e. if the transaction is larger
3384 * than the iclog, it will be the only thing in that iclog.
3385 * Fundamentally, this means we must pass the entire log vector to
3386 * xlog_write to guarantee this.
3388 iclog_space
= log
->l_iclog_size
- log
->l_iclog_hsize
;
3389 num_headers
= howmany(unit_bytes
, iclog_space
);
3391 /* for split-recs - ophdrs added when data split over LRs */
3392 unit_bytes
+= sizeof(xlog_op_header_t
) * num_headers
;
3394 /* add extra header reservations if we overrun */
3395 while (!num_headers
||
3396 howmany(unit_bytes
, iclog_space
) > num_headers
) {
3397 unit_bytes
+= sizeof(xlog_op_header_t
);
3400 unit_bytes
+= log
->l_iclog_hsize
* num_headers
;
3402 /* for commit-rec LR header - note: padding will subsume the ophdr */
3403 unit_bytes
+= log
->l_iclog_hsize
;
3405 /* for roundoff padding for transaction data and one for commit record */
3406 if (xfs_sb_version_haslogv2(&log
->l_mp
->m_sb
) &&
3407 log
->l_mp
->m_sb
.sb_logsunit
> 1) {
3408 /* log su roundoff */
3409 unit_bytes
+= 2*log
->l_mp
->m_sb
.sb_logsunit
;
3412 unit_bytes
+= 2*BBSIZE
;
3415 atomic_set(&tic
->t_ref
, 1);
3416 tic
->t_unit_res
= unit_bytes
;
3417 tic
->t_curr_res
= unit_bytes
;
3420 tic
->t_tid
= (xlog_tid_t
)((__psint_t
)tic
& 0xffffffff);
3421 tic
->t_clientid
= client
;
3422 tic
->t_flags
= XLOG_TIC_INITED
;
3423 tic
->t_trans_type
= 0;
3424 if (xflags
& XFS_LOG_PERM_RESERV
)
3425 tic
->t_flags
|= XLOG_TIC_PERM_RESERV
;
3426 sv_init(&tic
->t_wait
, SV_DEFAULT
, "logtick");
3428 xlog_tic_reset_res(tic
);
3434 /******************************************************************************
3436 * Log debug routines
3438 ******************************************************************************
3442 * Make sure that the destination ptr is within the valid data region of
3443 * one of the iclogs. This uses backup pointers stored in a different
3444 * part of the log in case we trash the log structure.
3447 xlog_verify_dest_ptr(
3454 for (i
= 0; i
< log
->l_iclog_bufs
; i
++) {
3455 if (ptr
>= log
->l_iclog_bak
[i
] &&
3456 ptr
<= log
->l_iclog_bak
[i
] + log
->l_iclog_size
)
3461 xlog_panic("xlog_verify_dest_ptr: invalid ptr");
3465 xlog_verify_grant_head(xlog_t
*log
, int equals
)
3467 if (log
->l_grant_reserve_cycle
== log
->l_grant_write_cycle
) {
3469 ASSERT(log
->l_grant_reserve_bytes
>= log
->l_grant_write_bytes
);
3471 ASSERT(log
->l_grant_reserve_bytes
> log
->l_grant_write_bytes
);
3473 ASSERT(log
->l_grant_reserve_cycle
-1 == log
->l_grant_write_cycle
);
3474 ASSERT(log
->l_grant_write_bytes
>= log
->l_grant_reserve_bytes
);
3476 } /* xlog_verify_grant_head */
3478 /* check if it will fit */
3480 xlog_verify_tail_lsn(xlog_t
*log
,
3481 xlog_in_core_t
*iclog
,
3486 if (CYCLE_LSN(tail_lsn
) == log
->l_prev_cycle
) {
3488 log
->l_logBBsize
- (log
->l_prev_block
- BLOCK_LSN(tail_lsn
));
3489 if (blocks
< BTOBB(iclog
->ic_offset
)+BTOBB(log
->l_iclog_hsize
))
3490 xlog_panic("xlog_verify_tail_lsn: ran out of log space");
3492 ASSERT(CYCLE_LSN(tail_lsn
)+1 == log
->l_prev_cycle
);
3494 if (BLOCK_LSN(tail_lsn
) == log
->l_prev_block
)
3495 xlog_panic("xlog_verify_tail_lsn: tail wrapped");
3497 blocks
= BLOCK_LSN(tail_lsn
) - log
->l_prev_block
;
3498 if (blocks
< BTOBB(iclog
->ic_offset
) + 1)
3499 xlog_panic("xlog_verify_tail_lsn: ran out of log space");
3501 } /* xlog_verify_tail_lsn */
3504 * Perform a number of checks on the iclog before writing to disk.
3506 * 1. Make sure the iclogs are still circular
3507 * 2. Make sure we have a good magic number
3508 * 3. Make sure we don't have magic numbers in the data
3509 * 4. Check fields of each log operation header for:
3510 * A. Valid client identifier
3511 * B. tid ptr value falls in valid ptr space (user space code)
3512 * C. Length in log record header is correct according to the
3513 * individual operation headers within record.
3514 * 5. When a bwrite will occur within 5 blocks of the front of the physical
3515 * log, check the preceding blocks of the physical log to make sure all
3516 * the cycle numbers agree with the current cycle number.
3519 xlog_verify_iclog(xlog_t
*log
,
3520 xlog_in_core_t
*iclog
,
3524 xlog_op_header_t
*ophead
;
3525 xlog_in_core_t
*icptr
;
3526 xlog_in_core_2_t
*xhdr
;
3528 xfs_caddr_t base_ptr
;
3529 __psint_t field_offset
;
3531 int len
, i
, j
, k
, op_len
;
3534 /* check validity of iclog pointers */
3535 spin_lock(&log
->l_icloglock
);
3536 icptr
= log
->l_iclog
;
3537 for (i
=0; i
< log
->l_iclog_bufs
; i
++) {
3539 xlog_panic("xlog_verify_iclog: invalid ptr");
3540 icptr
= icptr
->ic_next
;
3542 if (icptr
!= log
->l_iclog
)
3543 xlog_panic("xlog_verify_iclog: corrupt iclog ring");
3544 spin_unlock(&log
->l_icloglock
);
3546 /* check log magic numbers */
3547 if (be32_to_cpu(iclog
->ic_header
.h_magicno
) != XLOG_HEADER_MAGIC_NUM
)
3548 xlog_panic("xlog_verify_iclog: invalid magic num");
3550 ptr
= (xfs_caddr_t
) &iclog
->ic_header
;
3551 for (ptr
+= BBSIZE
; ptr
< ((xfs_caddr_t
)&iclog
->ic_header
) + count
;
3553 if (be32_to_cpu(*(__be32
*)ptr
) == XLOG_HEADER_MAGIC_NUM
)
3554 xlog_panic("xlog_verify_iclog: unexpected magic num");
3558 len
= be32_to_cpu(iclog
->ic_header
.h_num_logops
);
3559 ptr
= iclog
->ic_datap
;
3561 ophead
= (xlog_op_header_t
*)ptr
;
3562 xhdr
= iclog
->ic_data
;
3563 for (i
= 0; i
< len
; i
++) {
3564 ophead
= (xlog_op_header_t
*)ptr
;
3566 /* clientid is only 1 byte */
3567 field_offset
= (__psint_t
)
3568 ((xfs_caddr_t
)&(ophead
->oh_clientid
) - base_ptr
);
3569 if (syncing
== B_FALSE
|| (field_offset
& 0x1ff)) {
3570 clientid
= ophead
->oh_clientid
;
3572 idx
= BTOBBT((xfs_caddr_t
)&(ophead
->oh_clientid
) - iclog
->ic_datap
);
3573 if (idx
>= (XLOG_HEADER_CYCLE_SIZE
/ BBSIZE
)) {
3574 j
= idx
/ (XLOG_HEADER_CYCLE_SIZE
/ BBSIZE
);
3575 k
= idx
% (XLOG_HEADER_CYCLE_SIZE
/ BBSIZE
);
3576 clientid
= xlog_get_client_id(
3577 xhdr
[j
].hic_xheader
.xh_cycle_data
[k
]);
3579 clientid
= xlog_get_client_id(
3580 iclog
->ic_header
.h_cycle_data
[idx
]);
3583 if (clientid
!= XFS_TRANSACTION
&& clientid
!= XFS_LOG
)
3584 cmn_err(CE_WARN
, "xlog_verify_iclog: "
3585 "invalid clientid %d op 0x%p offset 0x%lx",
3586 clientid
, ophead
, (unsigned long)field_offset
);
3589 field_offset
= (__psint_t
)
3590 ((xfs_caddr_t
)&(ophead
->oh_len
) - base_ptr
);
3591 if (syncing
== B_FALSE
|| (field_offset
& 0x1ff)) {
3592 op_len
= be32_to_cpu(ophead
->oh_len
);
3594 idx
= BTOBBT((__psint_t
)&ophead
->oh_len
-
3595 (__psint_t
)iclog
->ic_datap
);
3596 if (idx
>= (XLOG_HEADER_CYCLE_SIZE
/ BBSIZE
)) {
3597 j
= idx
/ (XLOG_HEADER_CYCLE_SIZE
/ BBSIZE
);
3598 k
= idx
% (XLOG_HEADER_CYCLE_SIZE
/ BBSIZE
);
3599 op_len
= be32_to_cpu(xhdr
[j
].hic_xheader
.xh_cycle_data
[k
]);
3601 op_len
= be32_to_cpu(iclog
->ic_header
.h_cycle_data
[idx
]);
3604 ptr
+= sizeof(xlog_op_header_t
) + op_len
;
3606 } /* xlog_verify_iclog */
3610 * Mark all iclogs IOERROR. l_icloglock is held by the caller.
3616 xlog_in_core_t
*iclog
, *ic
;
3618 iclog
= log
->l_iclog
;
3619 if (! (iclog
->ic_state
& XLOG_STATE_IOERROR
)) {
3621 * Mark all the incore logs IOERROR.
3622 * From now on, no log flushes will result.
3626 ic
->ic_state
= XLOG_STATE_IOERROR
;
3628 } while (ic
!= iclog
);
3632 * Return non-zero, if state transition has already happened.
3638 * This is called from xfs_force_shutdown, when we're forcibly
3639 * shutting down the filesystem, typically because of an IO error.
3640 * Our main objectives here are to make sure that:
3641 * a. the filesystem gets marked 'SHUTDOWN' for all interested
3642 * parties to find out, 'atomically'.
3643 * b. those who're sleeping on log reservations, pinned objects and
3644 * other resources get woken up, and be told the bad news.
3645 * c. nothing new gets queued up after (a) and (b) are done.
3646 * d. if !logerror, flush the iclogs to disk, then seal them off
3650 xfs_log_force_umount(
3651 struct xfs_mount
*mp
,
3661 * If this happens during log recovery, don't worry about
3662 * locking; the log isn't open for business yet.
3665 log
->l_flags
& XLOG_ACTIVE_RECOVERY
) {
3666 mp
->m_flags
|= XFS_MOUNT_FS_SHUTDOWN
;
3668 XFS_BUF_DONE(mp
->m_sb_bp
);
3673 * Somebody could've already done the hard work for us.
3674 * No need to get locks for this.
3676 if (logerror
&& log
->l_iclog
->ic_state
& XLOG_STATE_IOERROR
) {
3677 ASSERT(XLOG_FORCED_SHUTDOWN(log
));
3682 * We must hold both the GRANT lock and the LOG lock,
3683 * before we mark the filesystem SHUTDOWN and wake
3684 * everybody up to tell the bad news.
3686 spin_lock(&log
->l_icloglock
);
3687 spin_lock(&log
->l_grant_lock
);
3688 mp
->m_flags
|= XFS_MOUNT_FS_SHUTDOWN
;
3690 XFS_BUF_DONE(mp
->m_sb_bp
);
3693 * This flag is sort of redundant because of the mount flag, but
3694 * it's good to maintain the separation between the log and the rest
3697 log
->l_flags
|= XLOG_IO_ERROR
;
3700 * If we hit a log error, we want to mark all the iclogs IOERROR
3701 * while we're still holding the loglock.
3704 retval
= xlog_state_ioerror(log
);
3705 spin_unlock(&log
->l_icloglock
);
3708 * We don't want anybody waiting for log reservations
3709 * after this. That means we have to wake up everybody
3710 * queued up on reserve_headq as well as write_headq.
3711 * In addition, we make sure in xlog_{re}grant_log_space
3712 * that we don't enqueue anything once the SHUTDOWN flag
3713 * is set, and this action is protected by the GRANTLOCK.
3715 if ((tic
= log
->l_reserve_headq
)) {
3717 sv_signal(&tic
->t_wait
);
3719 } while (tic
!= log
->l_reserve_headq
);
3722 if ((tic
= log
->l_write_headq
)) {
3724 sv_signal(&tic
->t_wait
);
3726 } while (tic
!= log
->l_write_headq
);
3728 spin_unlock(&log
->l_grant_lock
);
3730 if (!(log
->l_iclog
->ic_state
& XLOG_STATE_IOERROR
)) {
3733 * Force the incore logs to disk before shutting the
3734 * log down completely.
3736 _xfs_log_force(mp
, XFS_LOG_SYNC
, NULL
);
3738 spin_lock(&log
->l_icloglock
);
3739 retval
= xlog_state_ioerror(log
);
3740 spin_unlock(&log
->l_icloglock
);
3743 * Wake up everybody waiting on xfs_log_force.
3744 * Callback all log item committed functions as if the
3745 * log writes were completed.
3747 xlog_state_do_callback(log
, XFS_LI_ABORTED
, NULL
);
3749 #ifdef XFSERRORDEBUG
3751 xlog_in_core_t
*iclog
;
3753 spin_lock(&log
->l_icloglock
);
3754 iclog
= log
->l_iclog
;
3756 ASSERT(iclog
->ic_callback
== 0);
3757 iclog
= iclog
->ic_next
;
3758 } while (iclog
!= log
->l_iclog
);
3759 spin_unlock(&log
->l_icloglock
);
3762 /* return non-zero if log IOERROR transition had already happened */
3767 xlog_iclogs_empty(xlog_t
*log
)
3769 xlog_in_core_t
*iclog
;
3771 iclog
= log
->l_iclog
;
3773 /* endianness does not matter here, zero is zero in
3776 if (iclog
->ic_header
.h_num_logops
)
3778 iclog
= iclog
->ic_next
;
3779 } while (iclog
!= log
->l_iclog
);