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remarkable-linux/fs/xfs
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Dave Chinner d35e88faa3 xfs: only update the last_sync_lsn when a transaction completes 
The log write code stamps each iclog with the current tail LSN in
the iclog header so that recovery knows where to find the tail of
thelog once it has found the head. Normally this is taken from the
first item on the AIL - the log item that corresponds to the oldest
active item in the log.

The problem is that when the AIL is empty, the tail lsn is dervied
from the the l_last_sync_lsn, which is the LSN of the last iclog to
be written to the log. In most cases this doesn't happen, because
the AIL is rarely empty on an active filesystem. However, when it
does, it opens up an interesting case when the transaction being
committed to the iclog spans multiple iclogs.

That is, the first iclog is stamped with the l_last_sync_lsn, and IO
is issued. Then the next iclog is setup, the changes copied into the
iclog (takes some time), and then the l_last_sync_lsn is stamped
into the header and IO is issued. This is still the same
transaction, so the tail lsn of both iclogs must be the same for log
recovery to find the entire transaction to be able to replay it.

The problem arises in that the iclog buffer IO completion updates
the l_last_sync_lsn with it's own LSN. Therefore, If the first iclog
completes it's IO before the second iclog is filled and has the tail
lsn stamped in it, it will stamp the LSN of the first iclog into
it's tail lsn field. If the system fails at this point, log recovery
will not see a complete transaction, so the transaction will no be
replayed.

The fix is simple - the l_last_sync_lsn is updated when a iclog
buffer IO completes, and this is incorrect. The l_last_sync_lsn
shoul dbe updated when a transaction is completed by a iclog buffer
IO. That is, only iclog buffers that have transaction commit
callbacks attached to them should update the l_last_sync_lsn. This
means that the last_sync_lsn will only move forward when a commit
record it written, not in the middle of a large transaction that is
rolling through multiple iclog buffers.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-10-17 13:43:35 -05:00
..
Kconfig
kmem.c xfs: switch to proper __bitwise type for KM_... flags 2012-05-29 23:28:32 -04:00
kmem.h xfs: switch to proper __bitwise type for KM_... flags 2012-05-29 23:28:32 -04:00
Makefile xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
mrlock.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
time.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
uuid.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
uuid.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs.h xfs: don't expect xfs headers to be in subdirectories 2011-08-12 13:57:55 -05:00
xfs_acl.c userns: Pass a userns parameter into posix_acl_to_xattr and posix_acl_from_xattr 2012-09-18 01:01:35 -07:00
xfs_acl.h xfs: Fix build breakage in xfs_iops.c when CONFIG_FS_POSIX_ACL is not set 2011-08-01 02:35:04 -04:00
xfs_ag.h xfs: move busy extent handling to it's own file 2012-05-14 16:20:55 -05:00
xfs_alloc.c xfs: don't defer metadata allocation to the workqueue 2012-07-13 13:09:27 -05:00
xfs_alloc.h xfs: move busy extent handling to it's own file 2012-05-14 16:20:55 -05:00
xfs_alloc_btree.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_alloc_btree.h xfs: struct xfs_buf_log_format isn't variable sized. 2012-07-01 14:50:04 -05:00
xfs_aops.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
xfs_aops.h Prefix IO_XX flags with XFS_IO_XX to avoid namespace colision. 2012-07-22 11:00:55 -05:00
xfs_attr.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_attr.h
xfs_attr_leaf.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_attr_leaf.h xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_attr_sf.h
xfs_bit.c
xfs_bit.h
xfs_bmap.c xfs: make largest supported offset less shouty 2012-06-14 12:28:24 -05:00
xfs_bmap.h xfs: move xfs_fsb_to_db to xfs_bmap.h 2012-05-14 16:20:57 -05:00
xfs_bmap_btree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_bmap_btree.h
xfs_btree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_btree.h xfs: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_buf.c xfs: fix race while discarding buffers [V4] 2012-08-29 15:01:11 -05:00
xfs_buf.h xfs: fix race while discarding buffers [V4] 2012-08-29 15:01:11 -05:00
xfs_buf_item.c xfs: do not call xfs_bdstrat_cb in xfs_buf_iodone_callbacks 2012-07-13 13:09:49 -05:00
xfs_buf_item.h xfs: support discontiguous buffers in the xfs_buf_log_item 2012-07-01 14:50:06 -05:00
xfs_da_btree.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_da_btree.h xfs: fix comment typo of struct xfs_da_blkinfo. 2012-07-22 10:34:42 -05:00
xfs_dfrag.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
xfs_dfrag.h
xfs_dinode.h xfs: fix typo in comment of xfs_dinode_t. 2012-06-14 12:28:26 -05:00
xfs_dir2.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2.h xfs: reshuffle dir2 headers 2011-07-13 13:43:48 +02:00
xfs_dir2_block.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_data.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_format.h xfs: cleanup struct xfs_dir2_free 2011-07-13 13:43:48 +02:00
xfs_dir2_leaf.c xfs: factor buffer reading from xfs_dir2_leaf_getdents 2012-07-01 14:50:08 -05:00
xfs_dir2_node.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_priv.h xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_dir2_sf.c xfs: remove struct xfs_dabuf and infrastructure 2012-07-01 14:50:07 -05:00
xfs_discard.c xfs: check for possible overflow in xfs_ioc_trim 2012-08-23 14:48:44 -05:00
xfs_discard.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_dquot.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_dquot.h xfs: on-stack delayed write buffer lists 2012-05-14 16:20:31 -05:00
xfs_dquot_item.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_dquot_item.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_error.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_error.h
xfs_export.c xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_export.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_extent_busy.c xfs: make xfs_extent_busy_trim not static 2012-05-14 16:21:04 -05:00
xfs_extent_busy.h xfs: make xfs_extent_busy_trim not static 2012-05-14 16:21:04 -05:00
xfs_extfree_item.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_extfree_item.h
xfs_file.c xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_filestream.c xfs: rename allocation range fields in struct xfs_bmalloca 2011-10-11 21:15:06 -05:00
xfs_filestream.h
xfs_fs.h xfs: consolidate & clarify mount sanity checks 2011-07-08 11:32:51 -05:00
xfs_fs_subr.c xfs: remove the i_size field in struct xfs_inode 2012-01-17 15:08:53 -06:00
xfs_fsops.c xfs: make XBF_MAPPED the default behaviour 2012-05-14 16:21:03 -05:00
xfs_fsops.h
xfs_globals.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_ialloc.c xfs: Fix m_agirotor reset during AG selection 2012-09-26 15:42:42 -05:00
xfs_ialloc.h xfs: remove the alloc_done argument to xfs_dialloc 2012-07-29 16:00:31 -05:00
xfs_ialloc_btree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_ialloc_btree.h
xfs_icache.c xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_icache.h xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_inode.c xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_inode.h xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_inode_item.c xfs: check for stale inode before acquiring iflock on push 2012-06-21 14:20:06 -05:00
xfs_inode_item.h xfs: pass shutdown method into xfs_trans_ail_delete_bulk 2012-05-14 16:20:33 -05:00
xfs_inum.h xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_ioctl.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
xfs_ioctl.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_ioctl32.c xfs: Convert to new freezing code 2012-07-31 09:45:48 +04:00
xfs_ioctl32.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_iomap.c xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_iomap.h
xfs_iops.c xfs: update for 3.6-rc1 2012-07-30 13:37:53 -07:00
xfs_iops.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_itable.c xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_itable.h
xfs_linux.h xfs: revert to using a kthread for AIL pushing 2011-10-11 11:02:49 -05:00
xfs_log.c xfs: only update the last_sync_lsn when a transaction completes 2012-10-17 13:43:35 -05:00
xfs_log.h xfs: xfs_quiesce_attr() should quiesce the log like unmount 2012-10-17 13:39:14 -05:00
xfs_log_cil.c xfs: rename log structure to xlog 2012-06-21 14:21:11 -05:00
xfs_log_priv.h xfs: sync work is now only periodic log work 2012-10-17 11:53:29 -05:00
xfs_log_recover.c xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_log_recover.h
xfs_message.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_message.h treewide: use __printf not __attribute__((format(printf,...))) 2011-10-31 17:30:54 -07:00
xfs_mount.c xfs: rename xfs_sync.[ch] to xfs_icache.[ch] 2012-10-17 13:40:09 -05:00
xfs_mount.h xfs: rename xfs_sync.[ch] to xfs_icache.[ch] 2012-10-17 13:40:09 -05:00
xfs_mru_cache.c
xfs_mru_cache.h
xfs_qm.c xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_qm.h xfs: remove the global xfs_Gqm structure 2012-03-14 12:06:32 -05:00
xfs_qm_bhv.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_qm_syscalls.c xfs: rename xfs_sync.[ch] to xfs_icache.[ch] 2012-10-17 13:40:09 -05:00
xfs_quota.h Define new macro XFS_ALL_QUOTA_ACTIVE and simply some usage 2012-02-03 11:32:20 -06:00
xfs_quota_priv.h xfs: use per-filesystem radix trees for dquot lookup 2012-03-14 11:09:06 -05:00
xfs_quotaops.c userns: Convert qutoactl 2012-09-18 01:01:39 -07:00
xfs_rename.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_rtalloc.c xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_rtalloc.h xfs: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_sb.h xfs: kill the unused XFS_BB_FSB_OFFSET macro 2012-02-02 17:08:04 -06:00
xfs_stats.c xfs: use common code for quota statistics 2012-03-14 11:09:06 -05:00
xfs_stats.h xfs: use common code for quota statistics 2012-03-14 11:09:06 -05:00
xfs_super.c xfs: rename xfs_sync.[ch] to xfs_icache.[ch] 2012-10-17 13:40:09 -05:00
xfs_super.h xfs: xfs_sync_data is redundant. 2012-10-17 12:01:25 -05:00
xfs_sysctl.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_sysctl.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_trace.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_trace.h xfs: kill struct declarations in xfs_mount.h 2012-08-16 13:29:35 -05:00
xfs_trans.c xfs: Convert to new freezing code 2012-07-31 09:45:48 +04:00
xfs_trans.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
xfs_trans_ail.c xfs: re-enable xfsaild idle mode and fix associated races 2012-07-29 16:27:57 -05:00
xfs_trans_buf.c xfs: add discontiguous buffer support to transactions 2012-07-01 14:50:06 -05:00
xfs_trans_dquot.c userns: Convert quota netlink aka quota_send_warning 2012-09-18 01:01:40 -07:00
xfs_trans_extfree.c xfs: move xfsagino_t to xfs_types.h 2012-05-14 16:20:54 -05:00
xfs_trans_inode.c xfs: clean up xfs_bit.h includes 2012-05-14 16:21:00 -05:00
xfs_trans_priv.h xfs: re-enable xfsaild idle mode and fix associated races 2012-07-29 16:27:57 -05:00
xfs_trans_space.h
xfs_types.h xfs: struct xfs_buf_log_format isn't variable sized. 2012-07-01 14:50:04 -05:00
xfs_utils.c xfs: remove the alloc_done argument to xfs_dialloc 2012-07-29 16:00:31 -05:00
xfs_utils.h xfs: propagate umode_t 2012-01-03 22:55:00 -05:00
xfs_vnode.h xfs: remove remaining scraps of struct xfs_iomap 2012-03-15 13:40:16 -05:00
xfs_vnodeops.c xfs: remove xfs_iget.c 2012-10-17 13:42:25 -05:00
xfs_vnodeops.h xfs: remove remaining scraps of struct xfs_iomap 2012-03-15 13:40:16 -05:00
xfs_xattr.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00