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alistair23-linux/fs/xfs
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Christoph Hellwig 07fec73625 xfs: log changed inodes instead of writing them synchronously 
When an inode has already be flushed delayed write,
xfs_inode_clean() returns true and hence xfs_fs_write_inode() can
return on a synchronous inode write without having written the
inode. Currently these sycnhronous writes only come sync(1),
unmount, a sycnhronous NFS export and cachefiles so should be
relatively rare and out of common performance paths.

Realistically, a synchronous inode write is not necessary here; we
can avoid writing the inode by logging any non-transactional changes
that are pending.  This needs to be done with synchronous
transactions, but it avoids seeking between the log and inode
clusters as we do now. We don't force the log if the inode is
pinned, though, so this differs from the fsync case.  For normal
sys_sync and unmount behaviour this is fine because we do a
synchronous log force in xfs_sync_data which is called from the
->sync_fs code.

It does however break the NFS synchronous export guarantees for now,
but work is under way to fix this at a higher level or for the
higher level to provide an additional flag in the writeback control
to tell us that a log force is needed.

Portions of this patch are based on work from Dave Chinner.

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Alex Elder <aelder@sgi.com>
2010-02-09 11:43:49 +11:00
..
linux-2.6 xfs: log changed inodes instead of writing them synchronously 2010-02-09 11:43:49 +11:00
quota xfs: kill the unused XFS_QMOPT_* flush flags V2 2010-02-04 09:48:58 +11:00
support xfs: event tracing support 2009-12-14 23:08:16 -06:00
Kconfig
Makefile xfs: turn off sign warnings 2010-01-26 15:10:15 +11:00
xfs.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_acl.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_ag.h xfs: embed the pagb_list array in the perag structure 2010-01-15 15:34:39 -06:00
xfs_alloc.c xfs: cleanup up xfs_log_force calling conventions 2010-01-21 13:44:49 -06:00
xfs_alloc.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_alloc_btree.c xfs: Don't directly reference m_perag in allocation code 2010-01-15 15:33:12 -06:00
xfs_alloc_btree.h
xfs_arch.h
xfs_attr.c xfs: remove duplicate buffer flags 2010-01-21 13:44:36 -06:00
xfs_attr.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_attr_leaf.c xfs: remove duplicate buffer flags 2010-01-21 13:44:36 -06:00
xfs_attr_leaf.h
xfs_attr_sf.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00
xfs_bit.c
xfs_bit.h
xfs_bmap.c xfs: suppress spurious uninitialised var warning in xfs_bmapi() 2010-01-20 10:50:06 +11:00
xfs_bmap.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_bmap_btree.c xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_bmap_btree.h xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_btree.c xfs: remove duplicate buffer flags 2010-01-21 13:44:36 -06:00
xfs_btree.h
xfs_btree_trace.c
xfs_btree_trace.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_buf_item.c xfs: Don't issue buffer IO direct from AIL push V2 2010-02-02 10:13:42 +11:00
xfs_buf_item.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_da_btree.c xfs: convert dirnameops to unsigned char names 2010-01-20 10:47:17 +11:00
xfs_da_btree.h xfs: convert dirnameops to unsigned char names 2010-01-20 10:47:17 +11:00
xfs_dfrag.c xfs: clean up inconsistent variable naming in xfs_swap_extent 2010-01-15 15:31:23 -06:00
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.c xfs: clean up sign warnings in dir2 code 2010-01-20 10:48:05 +11:00
xfs_dir2.h xfs: make xfs_dir_cilookup_result use unsigned char 2010-01-20 10:47:25 +11:00
xfs_dir2_block.c xfs: clean up sign warnings in dir2 code 2010-01-20 10:48:05 +11:00
xfs_dir2_block.h
xfs_dir2_data.c
xfs_dir2_data.h
xfs_dir2_leaf.c xfs: clean up sign warnings in dir2 code 2010-01-20 10:48:05 +11:00
xfs_dir2_leaf.h
xfs_dir2_node.c xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_dir2_node.h xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_dir2_sf.c xfs: clean up sign warnings in dir2 code 2010-01-20 10:48:05 +11:00
xfs_dir2_sf.h
xfs_dmapi.h
xfs_dmops.c
xfs_error.c
xfs_error.h
xfs_extfree_item.c xfs: kill XLOG_VEC_SET_TYPE 2010-01-21 13:44:43 -06:00
xfs_extfree_item.h
xfs_filestream.c xfs: Kill filestreams cache flush 2010-01-15 15:34:22 -06:00
xfs_filestream.h xfs: Kill filestreams cache flush 2010-01-15 15:34:22 -06:00
xfs_fs.h
xfs_fsops.c xfs: Replace per-ag array with a radix tree 2010-01-15 15:33:52 -06:00
xfs_fsops.h
xfs_ialloc.c xfs: remove duplicate buffer flags 2010-01-21 13:44:36 -06:00
xfs_ialloc.h
xfs_ialloc_btree.c
xfs_ialloc_btree.h
xfs_iget.c xfs: rename xfs_get_perag 2010-01-15 15:33:02 -06:00
xfs_inode.c xfs: Use delayed write for inodes rather than async V2 2010-02-06 12:39:36 +11:00
xfs_inode.h xfs: Use delayed write for inodes rather than async V2 2010-02-06 12:39:36 +11:00
xfs_inode_item.c xfs: Don't issue buffer IO direct from AIL push V2 2010-02-02 10:13:42 +11:00
xfs_inode_item.h xfs: Don't issue buffer IO direct from AIL push V2 2010-02-02 10:13:42 +11:00
xfs_inum.h
xfs_iomap.c xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_iomap.h xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_itable.c xfs: replace KM_LARGE with explicit vmalloc use 2010-01-21 13:44:56 -06:00
xfs_itable.h
xfs_log.c xfs: cleanup up xfs_log_force calling conventions 2010-01-21 13:44:49 -06:00
xfs_log.h xfs: cleanup up xfs_log_force calling conventions 2010-01-21 13:44:49 -06:00
xfs_log_priv.h xfs: make several more functions static 2010-01-15 15:31:38 -06:00
xfs_log_recover.c xfs: cleanup up xfs_log_force calling conventions 2010-01-21 13:44:49 -06:00
xfs_log_recover.h xfs: Use list_heads for log recovery item lists 2010-01-15 15:31:51 -06:00
xfs_mount.c xfs: Use delayed write for inodes rather than async V2 2010-02-06 12:39:36 +11:00
xfs_mount.h xfs: more reserved blocks fixups 2010-02-08 17:41:48 -06:00
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: kill the unused XFS_QMOPT_* flush flags V2 2010-02-04 09:48:58 +11:00
xfs_refcache.h
xfs_rename.c xfs: event tracing support 2009-12-14 23:08:16 -06:00
xfs_rtalloc.c xfs: fix missing error check in xfs_rtfree_range 2010-01-15 13:46:19 -06:00
xfs_rtalloc.h
xfs_rw.c xfs: move more buffer helpers into xfs_buf.c 2010-01-15 15:35:17 -06:00
xfs_rw.h xfs: move more buffer helpers into xfs_buf.c 2010-01-15 15:35:17 -06:00
xfs_sb.h
xfs_trans.c xfs: cleanup up xfs_log_force calling conventions 2010-01-21 13:44:49 -06:00
xfs_trans.h xfs: Don't issue buffer IO direct from AIL push V2 2010-02-02 10:13:42 +11:00
xfs_trans_ail.c xfs: Don't issue buffer IO direct from AIL push V2 2010-02-02 10:13:42 +11:00
xfs_trans_buf.c xfs: remove duplicate buffer flags 2010-01-21 13:44:36 -06:00
xfs_trans_extfree.c
xfs_trans_inode.c
xfs_trans_item.c
xfs_trans_priv.h
xfs_trans_space.h
xfs_types.h xfs: directory names are unsigned 2010-01-20 10:44:58 +11:00
xfs_utils.c
xfs_utils.h
xfs_vnodeops.c xfs: remove invalid barrier optimization from xfs_fsync 2010-02-02 10:16:26 +11:00
xfs_vnodeops.h xfs: convert attr to use unsigned names 2010-01-20 10:47:48 +11:00