Dave Chinner eda7798272 xfs: serialise unaligned direct IOs ... When two concurrent unaligned, non-overlapping direct IOs are issued to the same block, the direct Io layer will race to zero the block. The result is that one of the concurrent IOs will overwrite data written by the other IO with zeros. This is demonstrated by the xfsqa test 240. To avoid this problem, serialise all unaligned direct IOs to an inode with a big hammer. We need a big hammer approach as we need to serialise AIO as well, so we can't just block writes on locks. Hence, the big hammer is calling xfs_ioend_wait() while holding out other unaligned direct IOs from starting. We don't bother trying to serialised aligned vs unaligned IOs as they are overlapping IO and the result of concurrent overlapping IOs is undefined - the result of either IO is a valid result so we let them race. Hence we only penalise unaligned IO, which already has a major overhead compared to aligned IO so this isn't a major problem. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Alex Elder <aelder@sgi.com> Reviewed-by: Christoph Hellwig <hch@lst.de>		2011-01-11 10:22:40 +11:00
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linux-2.6	xfs: serialise unaligned direct IOs	2011-01-11 10:22:40 +11:00
quota	xfs: use wait queues directly for the log wait queues	2010-12-21 12:09:01 +11:00
support	xfs: drop dmapi hooks	2010-07-26 13:16:33 -05:00
Kconfig	quota: Make QUOTACTL config be selected by its users	2010-10-05 12:16:37 +02:00
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: convert pag_ici_lock to a spin lock	2010-12-16 17:08:41 +11:00
xfs_alloc_btree.c	xfs: remove the ->kill_root btree operation	2010-10-18 15:07:38 -05:00
xfs_alloc_btree.h	[XFS] Always use struct xfs_btree_block instead of short / longform	2008-10-30 17:14:34 +11:00
xfs_alloc.c	xfs: factor duplicate code in xfs_alloc_ag_vextent_near into a helper	2010-12-16 16:06:15 -06:00
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: use generic Posix ACL code	2009-06-10 17:07:47 +02:00
xfs_attr_leaf.c	xfs: use KM_NOFS for allocations during attribute list operations	2010-12-23 11:57:37 +11:00
xfs_attr_leaf.h	[XFS] Remove macro-to-function indirections in attr code	2009-01-09 15:46:44 +11:00
xfs_attr_sf.h	xfs: convert attr to use unsigned names	2010-01-20 10:47:48 +11:00
xfs_attr.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -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] Remove macro-to-function indirections in the mask code	2009-01-09 15:53:54 +11:00
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: delayed alloc blocks beyond EOF are valid after writeback	2010-12-01 07:40:20 -06:00
xfs_bmap.h	xfs: fix failed write truncation handling.	2010-12-01 07:40:19 -06:00
xfs_btree_trace.c	[XFS] make btree tracing generic	2008-10-30 16:58:50 +11:00
xfs_btree_trace.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00
xfs_btree.c	xfs: connect up buffer reclaim priority hooks	2010-12-02 16:31:13 +11:00
xfs_btree.h	xfs: remove the ->kill_root btree operation	2010-10-18 15:07:38 -05:00
xfs_buf_item.c	xfs: consume iodone callback items on buffers as they are processed	2010-12-03 17:00:52 +11:00
xfs_buf_item.h	xfs: use struct list_head for the buf cancel table	2010-12-16 16:05:22 -06:00
xfs_da_btree.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -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: delayed alloc blocks beyond EOF are valid after writeback	2010-12-01 07:40:20 -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: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
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: fix various typos	2009-03-29 09:55:42 +02:00
xfs_dir2_leaf.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -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] kill xfs_dinode_core_t	2008-12-01 11:37:35 +11:00
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: only run xfs_error_test if error injection is active	2010-12-01 07:40:20 -06:00
xfs_error.h	xfs: only run xfs_error_test if error injection is active	2010-12-01 07:40:20 -06:00
xfs_extfree_item.c	xfs: Pull EFI/EFD handling out from under the AIL lock	2010-12-20 11:59:49 +11:00
xfs_extfree_item.h	xfs: Pull EFI/EFD handling out from under the AIL lock	2010-12-20 11:59:49 +11:00
xfs_filestream.c	xfs: tell lockdep about parent iolock usage in filestreams	2010-11-10 12:00:48 -06:00
xfs_filestream.h	xfs: clean up filestreams helpers	2010-07-26 13:16:51 -05:00
xfs_fs.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_fsops.c	xfs: dynamic speculative EOF preallocation	2011-01-04 11:35:03 +11:00
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 the ->kill_root btree operation	2010-10-18 15:07:38 -05:00
xfs_ialloc_btree.h	xfs: remove superflous inobt macros	2009-02-09 08:37:14 +01:00
xfs_ialloc.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_ialloc.h	xfs: rationalize xfs_inobt_lookup*	2009-09-01 12:45:39 -05:00
xfs_iget.c	xfs: convert pag_ici_lock to a spin lock	2010-12-16 17:08:41 +11:00
xfs_inode_item.c	xfs: remove all the inodes on a buffer from the AIL in bulk	2010-12-20 12:03:17 +11:00
xfs_inode_item.h	xfs: simplify inode to transaction joining	2010-07-26 13:16:36 -05:00
xfs_inode.c	xfs: connect up buffer reclaim priority hooks	2010-12-02 16:31:13 +11:00
xfs_inode.h	xfs: don't truncate prealloc from frequently accessed inodes	2010-12-23 12:02:31 +11:00
xfs_inum.h	xfs: remove XFS_INO64_OFFSET	2009-08-31 14:46:22 -05:00
xfs_iomap.c	xfs: dynamic speculative EOF preallocation	2011-01-04 11:35:03 +11:00
xfs_iomap.h	xfs: kill xfs_iomap	2010-12-16 16:05:51 -06:00
xfs_itable.c	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -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: use wait queues directly for the log wait queues	2010-12-21 12:09:01 +11:00
xfs_log_priv.h	xfs: convert grant head manipulations to lockless algorithm	2010-12-21 12:29:14 +11:00
xfs_log_recover.c	xfs: convert l_tail_lsn to an atomic variable.	2010-12-21 12:28:39 +11:00
xfs_log_recover.h	xfs: Clean up XFS_BLI_* flag namespace	2010-05-24 10:33:39 -05:00
xfs_log.c	xfs: convert grant head manipulations to lockless algorithm	2010-12-21 12:29:14 +11:00
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: convert pag_ici_lock to a spin lock	2010-12-16 17:08:41 +11:00
xfs_mount.h	xfs: dynamic speculative EOF preallocation	2011-01-04 11:35:03 +11:00
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: fix a few compiler warnings with CONFIG_XFS_QUOTA=n	2010-11-10 12:00:48 -06:00
xfs_rename.c	xfs: log timestamp changes to the source inode in rename	2010-12-09 17:07:02 -06:00
xfs_rtalloc.c	xfs: use unhashed buffers for size checks	2010-10-18 15:07:50 -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: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_trans_ail.c	xfs: use AIL bulk delete function to implement single delete	2010-12-20 12:36:15 +11:00
xfs_trans_buf.c	xfs: remove xfs_buf wrappers	2010-10-18 15:08:07 -05:00
xfs_trans_extfree.c	xfs: Pull EFI/EFD handling out from under the AIL lock	2010-12-20 11:59:49 +11:00
xfs_trans_inode.c	xfs: don't use vfs writeback for pure metadata modifications	2010-10-18 15:07:45 -05:00
xfs_trans_priv.h	xfs: use AIL bulk delete function to implement single delete	2010-12-20 12:36:15 +11:00
xfs_trans_space.h	xfs: remove superflous inobt macros	2009-02-09 08:37:14 +01:00
xfs_trans.c	xfs: bulk AIL insertion during transaction commit	2010-12-20 12:02:19 +11:00
xfs_trans.h	xfs: connect up buffer reclaim priority hooks	2010-12-02 16:31:13 +11:00
xfs_types.h	xfs: Extend project quotas to support 32bit project ids	2010-10-18 15:08:08 -05:00
xfs_utils.c	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs_utils.h	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs_vnodeops.c	xfs: don't truncate prealloc from frequently accessed inodes	2010-12-23 12:02:31 +11:00
xfs_vnodeops.h	xfs: remove xfs_cred.h	2010-10-18 15:08:06 -05:00
xfs.h	xfs: event tracing support	2009-12-14 23:08:16 -06:00