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Dave Chinner 1a387d3be2 xfs: dummy transactions should not dirty VFS state 
When we  need to cover the log, we issue dummy transactions to ensure
the current log tail is on disk. Unfortunately we currently use the
root inode in the dummy transaction, and the act of committing the
transaction dirties the inode at the VFS level.

As a result, the VFS writeback of the dirty inode will prevent the
filesystem from idling long enough for the log covering state
machine to complete. The state machine gets stuck in a loop issuing
new dummy transactions to cover the log and never makes progress.

To avoid this problem, the dummy transactions should not cause
externally visible state changes. To ensure this occurs, make sure
that dummy transactions log an unchanging field in the superblock as
it's state is never propagated outside the filesystem. This allows
the log covering state machine to complete successfully and the
filesystem now correctly enters a fully idle state about 90s after
the last modification was made.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2010-08-24 11:46:31 +10:00
..
linux-2.6 xfs: dummy transactions should not dirty VFS state 2010-08-24 11:46:31 +10:00
quota Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-08-07 12:57:07 -07:00
support xfs: drop dmapi hooks 2010-07-26 13:16:33 -05:00
Kconfig
Makefile xfs: simplify log item descriptor tracking 2010-07-26 13:16:34 -05:00
xfs_acl.h xfs: constify xattr_handler 2010-05-21 18:31:19 -04:00
xfs_ag.h xfs: fix access to upper inodes without inode64 2010-05-28 15:19:56 -05:00
xfs_alloc_btree.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_alloc_btree.h
xfs_alloc.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_alloc.h xfs: do not use emums for flags used in tracing 2010-07-26 13:16:43 -05:00
xfs_arch.h
xfs_attr_leaf.c xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_attr_leaf.h
xfs_attr_sf.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_attr.c xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_attr.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_bit.c
xfs_bit.h
xfs_bmap_btree.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_bmap_btree.h xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_bmap.c xfs: clean up xfs_bmap_get_bp 2010-07-26 13:16:53 -05:00
xfs_bmap.h xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_btree_trace.c
xfs_btree_trace.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_btree.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_btree.h
xfs_buf_item.c xfs: kill the b_strat callback in xfs_buf 2010-07-26 13:16:52 -05:00
xfs_buf_item.h xfs: give li_cb callbacks the correct prototype 2010-07-26 13:16:35 -05:00
xfs_da_btree.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_da_btree.h xfs: convert dirnameops to unsigned char names 2010-01-20 10:47:17 +11:00
xfs_dfrag.c xfs: simplify inode to transaction joining 2010-07-26 13:16:36 -05:00
xfs_dfrag.h xfs: clean up inconsistent variable naming in xfs_swap_extent 2010-01-15 15:31:23 -06:00
xfs_dinode.h
xfs_dir2_block.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_dir2_block.h
xfs_dir2_data.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_dir2_data.h
xfs_dir2_leaf.c xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_dir2_leaf.h
xfs_dir2_node.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_dir2_node.h xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_dir2_sf.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_dir2_sf.h
xfs_dir2.c xfs: split xfs_itrace_entry 2010-07-26 13:16:44 -05:00
xfs_dir2.h xfs: make xfs_dir_cilookup_result use unsigned char 2010-01-20 10:47:25 +11:00
xfs_error.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_error.h xfs: add const qualifiers to xfs error function args 2010-05-19 09:58:11 -05:00
xfs_extfree_item.c xfs: fix the xfs_log_iovec i_addr type 2010-07-26 13:16:36 -05:00
xfs_extfree_item.h
xfs_filestream.c xfs: clean up filestreams helpers 2010-07-26 13:16:51 -05:00
xfs_filestream.h xfs: clean up filestreams helpers 2010-07-26 13:16:51 -05:00
xfs_fs.h xfs: return inode fork offset in bulkstat for fsr 2010-03-05 11:02:07 -06:00
xfs_fsops.c xfs: dummy transactions should not dirty VFS state 2010-08-24 11:46:31 +10:00
xfs_fsops.h xfs: dummy transactions should not dirty VFS state 2010-08-24 11:46:31 +10:00
xfs_ialloc_btree.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_ialloc_btree.h
xfs_ialloc.c xfs: fix untrusted inode number lookup 2010-08-24 11:42:30 +10:00
xfs_ialloc.h
xfs_iget.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_inode_item.c xfs: fix big endian build 2010-07-26 16:07:38 -05:00
xfs_inode_item.h xfs: simplify inode to transaction joining 2010-07-26 13:16:36 -05:00
xfs_inode.c xfs: ensure we mark all inodes in a freed cluster XFS_ISTALE 2010-08-24 11:42:41 +10:00
xfs_inode.h xfs: simplify and remove xfs_ireclaim 2010-07-26 13:16:48 -05:00
xfs_inum.h
xfs_iomap.c xfs: small cleanups for xfs_iomap / __xfs_get_blocks 2010-07-26 13:16:42 -05:00
xfs_iomap.h xfs: do not use emums for flags used in tracing 2010-07-26 13:16:43 -05:00
xfs_itable.c xfs: remove xfs_iput 2010-07-26 13:16:44 -05:00
xfs_itable.h xfs: remove block number from inode lookup code 2010-06-24 11:35:17 +10:00
xfs_log_cil.c xfs: unlock items before allowing the CIL to commit 2010-08-24 11:42:52 +10:00
xfs_log_priv.h xfs: enable background pushing of the CIL 2010-05-24 10:38:20 -05:00
xfs_log_recover.c xfs: fix the xfs_log_iovec i_addr type 2010-07-26 13:16:36 -05:00
xfs_log_recover.h xfs: Clean up XFS_BLI_* flag namespace 2010-05-24 10:33:39 -05:00
xfs_log.c xfs: fix gcc 4.6 set but not read and unused statement warnings 2010-07-26 13:16:51 -05:00
xfs_log.h xfs: remove the unused XFS_LOG_SLEEP and XFS_LOG_NOSLEEP flags 2010-07-26 13:16:38 -05:00
xfs_mount.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_mount.h xfs: remove obsolete osyncisosync mount option 2010-07-26 13:16:51 -05:00
xfs_mru_cache.c xfs: Kill filestreams cache flush 2010-01-15 15:34:22 -06:00
xfs_mru_cache.h xfs: Kill filestreams cache flush 2010-01-15 15:34:22 -06:00
xfs_quota.h xfs: removed unused XFS_QMOPT_ flags 2010-05-19 09:58:15 -05:00
xfs_refcache.h
xfs_rename.c xfs: split xfs_itrace_entry 2010-07-26 13:16:44 -05:00
xfs_rtalloc.c xfs: remove unused delta tracking code in xfs_bmapi 2010-07-26 13:16:39 -05:00
xfs_rtalloc.h xfs: be more explicit if RT mount fails due to config 2010-05-28 14:58:24 -05:00
xfs_rw.c xfs: remove unneeded #include statements 2010-07-26 13:16:33 -05:00
xfs_rw.h xfs: only clear the suid bit once in xfs_write 2010-02-12 13:43:57 -06:00
xfs_sb.h
xfs_trans_ail.c xfs: drop dmapi hooks 2010-07-26 13:16:33 -05:00
xfs_trans_buf.c xfs: give li_cb callbacks the correct prototype 2010-07-26 13:16:35 -05:00
xfs_trans_extfree.c xfs: simplify log item descriptor tracking 2010-07-26 13:16:34 -05:00
xfs_trans_inode.c xfs: simplify inode to transaction joining 2010-07-26 13:16:36 -05:00
xfs_trans_priv.h xfs: unlock items before allowing the CIL to commit 2010-08-24 11:42:52 +10:00
xfs_trans_space.h
xfs_trans.c xfs: unlock items before allowing the CIL to commit 2010-08-24 11:42:52 +10:00
xfs_trans.h xfs: remove the unused XFS_TRANS_NOSLEEP/XFS_TRANS_WAIT flags 2010-07-26 13:16:38 -05:00
xfs_types.h xfs: make the log ticket ID available outside the log infrastructure 2010-05-24 10:33:52 -05:00
xfs_utils.c xfs: simplify xfs_truncate_file 2010-07-26 13:16:52 -05:00
xfs_utils.h xfs: simplify xfs_truncate_file 2010-07-26 13:16:52 -05:00
xfs_vnodeops.c xfs: new truncate sequence 2010-08-09 16:47:42 -04:00
xfs_vnodeops.h xfs: kill xfs_lrw.h 2010-03-01 16:35:44 -06:00
xfs.h xfs: event tracing support 2009-12-14 23:08:16 -06:00