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0c38a2512d
linux/fs/xfs
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Dave Chinner 0c38a2512d xfs: don't serialise direct IO reads on page cache checks 
There is no need to grab the i_mutex of the IO lock in exclusive
mode if we don't need to invalidate the page cache. Taking these
locks on every direct IO effective serialises them as taking the IO
lock in exclusive mode has to wait for all shared holders to drop
the lock. That only happens when IO is complete, so effective it
prevents dispatch of concurrent direct IO reads to the same inode.

Fix this by taking the IO lock shared to check the page cache state,
and only then drop it and take the IO lock exclusively if there is
work to be done. Hence for the normal direct IO case, no exclusive
locking will occur.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Tested-by: Joern Engel <joern@logfs.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
2011-10-11 21:14:59 -05:00
..
Kconfig
kmem.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
kmem.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
Makefile xfs: fix tracing builds inside the source tree 2011-08-22 16:37:24 -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_acl.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
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: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_alloc_btree.c xfs: remove leftovers of the old btree tracing code 2011-07-13 13:43:50 +02:00
xfs_alloc_btree.h
xfs_alloc.c xfs: Remove the macro XFS_BUF_ERROR and family 2011-07-25 14:57:46 -05:00
xfs_alloc.h xfs: do not discard alloc btree blocks 2011-05-24 11:17:22 -05:00
xfs_aops.c xfs: fix a use after free in xfs_end_io_direct_write 2011-09-14 08:56:35 -05:00
xfs_aops.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_attr_leaf.c xfs: byteswap constants instead of variables 2011-07-08 14:36:05 +02:00
xfs_attr_leaf.h
xfs_attr_sf.h
xfs_attr.c xfs: Remove the macro XFS_BUF_ERROR and family 2011-07-25 14:57:46 -05:00
xfs_attr.h
xfs_bit.c
xfs_bit.h
xfs_bmap_btree.c xfs: remove leftovers of the old btree tracing code 2011-07-13 13:43:50 +02:00
xfs_bmap_btree.h
xfs_bmap.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux 2011-08-08 07:06:24 -05:00
xfs_bmap.h xfs: remove the unused XFS_BMAPI_RSVBLOCKS flag 2011-05-25 10:48:36 -05:00
xfs_btree.c xfs: Remove the macro XFS_BUF_ERROR and family 2011-07-25 14:57:46 -05:00
xfs_btree.h xfs: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_buf_item.c "xfs: fix error handling for synchronous writes" revisited 2011-08-10 17:00:21 -05:00
xfs_buf_item.h
xfs_buf.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_buf.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_da_btree.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux 2011-08-08 07:06:24 -05:00
xfs_da_btree.h xfs: remove the dead XFS_DABUF_DEBUG code 2011-07-13 13:43:50 +02:00
xfs_dfrag.c xfs: cleanup duplicate initializations 2011-04-28 13:25:29 -05:00
xfs_dfrag.h
xfs_dinode.h xfs: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_dir2_block.c xfs: reshuffle dir2 headers 2011-07-13 13:43:48 +02:00
xfs_dir2_data.c xfs: reshuffle dir2 headers 2011-07-13 13:43:48 +02:00
xfs_dir2_format.h xfs: cleanup struct xfs_dir2_free 2011-07-13 13:43:48 +02:00
xfs_dir2_leaf.c xfs: factor out xfs_dir2_leaf_find_stale 2011-07-13 13:43:48 +02:00
xfs_dir2_node.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-07-25 13:56:39 -07:00
xfs_dir2_priv.h xfs: reshuffle dir2 headers 2011-07-13 13:43:48 +02:00
xfs_dir2_sf.c xfs: reshuffle dir2 headers 2011-07-13 13:43:48 +02:00
xfs_dir2.c xfs: get rid of open-coded S_ISREG(), etc. 2011-07-26 15:05:16 -04:00
xfs_dir2.h xfs: reshuffle dir2 headers 2011-07-13 13:43:48 +02:00
xfs_discard.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_discard.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_dquot_item.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_dquot_item.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_dquot.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_dquot.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_error.c
xfs_error.h
xfs_export.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_export.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_extfree_item.c
xfs_extfree_item.h
xfs_file.c xfs: don't serialise direct IO reads on page cache checks 2011-10-11 21:14:59 -05:00
xfs_filestream.c xfs: fix misspelled S_IS...() 2011-07-26 15:05:30 -04:00
xfs_filestream.h
xfs_fs_subr.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_fs.h xfs: consolidate & clarify mount sanity checks 2011-07-08 11:32:51 -05:00
xfs_fsops.c Revert "xfs: fix filesystsem freeze race in xfs_trans_alloc" 2011-07-11 10:21:03 -05:00
xfs_fsops.h
xfs_globals.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_ialloc_btree.c xfs: remove leftovers of the old btree tracing code 2011-07-13 13:43:50 +02:00
xfs_ialloc_btree.h
xfs_ialloc.c xfs: Remove the macro XFS_BUF_ERROR and family 2011-07-25 14:57:46 -05:00
xfs_ialloc.h
xfs_iget.c xfs: remove leftovers of the old btree tracing code 2011-07-13 13:43:50 +02:00
xfs_inode_item.c xfs: remove wrappers around b_fspriv 2011-07-13 13:43:49 +02:00
xfs_inode_item.h
xfs_inode.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux 2011-08-08 07:06:24 -05:00
xfs_inode.h xfs: get rid of open-coded S_ISREG(), etc. 2011-07-26 15:05:16 -04:00
xfs_inum.h xfs: cleanup shortform directory inode number handling 2011-07-08 14:35:03 +02:00
xfs_ioctl32.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_ioctl32.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_ioctl.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_ioctl.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_iomap.c Revert "xfs: fix filesystsem freeze race in xfs_trans_alloc" 2011-07-11 10:21:03 -05:00
xfs_iomap.h
xfs_iops.c xfs: fix xfs_mark_inode_dirty during umount 2011-08-31 17:59:39 -05:00
xfs_iops.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_itable.c xfs: fix variable set but not used warnings 2011-04-08 08:09:12 -05:00
xfs_itable.h
xfs_linux.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_log_cil.c xfs: add online discard support 2011-05-24 11:17:13 -05:00
xfs_log_priv.h xfs: exact busy extent tracking 2011-04-28 13:18:04 -05:00
xfs_log_recover.c xfs: replace xfs_buf_geterror() with bp->b_error 2011-08-12 13:39:40 -05:00
xfs_log_recover.h
xfs_log.c xfs: Remove the macro XFS_BUF_SET_PTR 2011-07-25 15:03:17 -05:00
xfs_log.h xfs: exact busy extent tracking 2011-04-28 13:18:04 -05:00
xfs_message.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_message.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_mount.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux 2011-08-08 07:06:24 -05:00
xfs_mount.h xfs: Remove the second parameter to xfs_sb_count() 2011-07-20 18:35:03 -05:00
xfs_mru_cache.c
xfs_mru_cache.h
xfs_qm_bhv.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_qm_stats.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_qm_stats.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_qm_syscalls.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_qm.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_qm.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_quota_priv.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_quota.h
xfs_quotaops.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_rename.c xfs: get rid of open-coded S_ISREG(), etc. 2011-07-26 15:05:16 -04:00
xfs_rtalloc.c xfs: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_rtalloc.h xfs: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_rw.c xfs: Remove the macro XFS_BUFTARG_NAME 2011-07-25 15:03:37 -05:00
xfs_rw.h
xfs_sb.h xfs: Remove the macro XFS_BUF_PTR 2011-07-25 15:03:13 -05:00
xfs_stats.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_stats.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_super.c xfs: fix ->write_inode return values 2011-09-01 09:46:11 -05:00
xfs_super.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_sync.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_sync.h xfs: remove subdirectories 2011-08-12 16:21:35 -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: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_trace.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_trans_ail.c xfs: set cursor in xfs_ail_splice() even when AIL was empty 2011-08-09 15:30:43 -05:00
xfs_trans_buf.c xfs: Remove the macro XFS_BUF_TARGET 2011-07-25 15:03:31 -05:00
xfs_trans_dquot.c xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_trans_extfree.c
xfs_trans_inode.c xfs: remove i_transp 2011-07-08 14:34:47 +02:00
xfs_trans_priv.h xfs: convert AIL cursors to use struct list_head 2011-07-20 18:37:46 -05:00
xfs_trans_space.h
xfs_trans.c xfs: use a cursor for bulk AIL insertion 2011-07-20 18:37:20 -05:00
xfs_trans.h Revert "xfs: fix filesystsem freeze race in xfs_trans_alloc" 2011-07-11 10:21:03 -05:00
xfs_types.h xfs: exact busy extent tracking 2011-04-28 13:18:04 -05:00
xfs_utils.c
xfs_utils.h
xfs_vnode.h xfs: remove subdirectories 2011-08-12 16:21:35 -05:00
xfs_vnodeops.c xfs: replace xfs_buf_geterror() with bp->b_error 2011-08-12 13:39:40 -05:00
xfs_vnodeops.h xfs: split xfs_setattr 2011-07-08 14:34:23 +02:00
xfs_xattr.c 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