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3d751af2cb
linux/fs/xfs
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Brian Foster 3d751af2cb xfs: flush entire file on dio read/write to cached file 
Filesystems are responsible to manage file coherency between the page
cache and direct I/O. The generic dio code flushes dirty pages over the
range of a dio to ensure that the dio read or a future buffered read
returns the correct data. XFS has generally followed this pattern,
though traditionally has flushed and invalidated the range from the
start of the I/O all the way to the end of the file. This changed after
the following commit:

	7d4ea3ce xfs: use ranged writeback and invalidation for direct IO

... as the full file flush was no longer necessary to deal with the
strange post-eof delalloc issues that were since fixed. Unfortunately,
we have since received complaints about performance degradation due to
the increased exclusive iolock cycles (which locks out parallel dio
submission) that occur when a file has cached pages. This does not occur
on filesystems that use the generic code as it also does not incorporate
locking.

The exclusive iolock is acquired any time the inode mapping has cached
pages, regardless of whether they reside in the range of the I/O or not.
If not, the flush/inval calls do no work and the lock was cycled for no
reason.

Under consideration of the cost of the exclusive iolock, update the dio
read and write handlers to flush and invalidate the entire mapping when
cached pages exist. In most cases, this increases the cost of the
initial flush sequence but eliminates the need for further lock cycles
and flushes so long as the workload does not actively mix direct and
buffered I/O. This also more closely matches historical behavior and
performance characteristics that users have come to expect.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2015-08-19 10:35:04 +10:00
..
libxfs xfs: Fix xfs_attr_leafblock definition 2015-08-19 10:34:32 +10:00
Kconfig xfs: require 64-bit sector_t 2014-07-30 09:12:05 +10:00
kmem.c xfs: change kmem_free to use generic kvfree() 2015-02-02 09:54:18 +11:00
kmem.h xfs: change kmem_free to use generic kvfree() 2015-02-02 09:54:18 +11:00
Makefile xfs: implement pNFS export operations 2015-02-16 11:49:23 +11:00
mrlock.h
uuid.c
uuid.h
xfs_acl.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_acl.h xfs: move acl structures to xfs_format.h 2014-11-28 14:24:37 +11:00
xfs_aops.c xfs: update for 4.2-rc1 2015-06-30 20:16:08 -07:00
xfs_aops.h xfs: add DAX file operations support 2015-06-04 09:18:53 +10:00
xfs_attr_inactive.c Merge branch 'xfs-misc-fixes-for-4.2-3' into for-next 2015-06-23 08:49:01 +10:00
xfs_attr_list.c xfs: pass attr geometry to attr leaf header conversion functions 2015-04-13 11:26:02 +10:00
xfs_attr.h
xfs_bit.c xfs: fix static and extern sparse warnings 2013-10-30 13:59:56 -05:00
xfs_bmap_util.c Merge branch 'xfs-commit-cleanup' into for-next 2015-06-04 13:55:48 +10:00
xfs_bmap_util.h xfs: Add support FALLOC_FL_INSERT_RANGE for fallocate 2015-03-25 15:08:56 +11:00
xfs_buf_item.c xfs: clarify async write failure ratelimit message 2015-02-24 10:14:04 +11:00
xfs_buf_item.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_buf.c xfs: return a void pointer from xfs_buf_offset 2015-06-22 09:44:29 +10:00
xfs_buf.h xfs: return a void pointer from xfs_buf_offset 2015-06-22 09:44:29 +10:00
xfs_dir2_readdir.c xfs: stop holding ILOCK over filldir callbacks 2015-08-19 10:33:00 +10:00
xfs_discard.c xfs: pass mp to XFS_WANT_CORRUPTED_GOTO 2015-02-23 22:39:08 +11:00
xfs_discard.h
xfs_dquot_item.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_dquot_item.h xfs: remove the quotaoff log format from the quotaoff log item 2013-12-13 11:34:08 +11:00
xfs_dquot.c xfs: dquots should be stamped with sb_meta_uuid 2015-08-19 10:32:01 +10:00
xfs_dquot.h xfs: fix implicit bool to int conversion 2015-01-09 10:48:58 +11:00
xfs_error.c xfs: remove inst_t 2015-06-22 09:44:02 +10:00
xfs_error.h xfs: remove inst_t 2015-06-22 09:44:02 +10:00
xfs_export.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
xfs_export.h
xfs_extent_busy.c xfs: merge xfs_ag.h into xfs_format.h 2014-11-28 14:25:04 +11:00
xfs_extent_busy.h xfs: decouple inode and bmap btree header files 2013-10-23 16:28:49 -05:00
xfs_extfree_item.c xfs: remove __psint_t and __psunsigned_t 2015-06-22 09:43:32 +10:00
xfs_extfree_item.h
xfs_file.c xfs: flush entire file on dio read/write to cached file 2015-08-19 10:35:04 +10:00
xfs_filestream.c xfs: clean up XFS_MIN_FREELIST macros 2015-06-22 10:13:30 +10:00
xfs_filestream.h xfs: add filestream allocator tracepoints 2014-04-23 07:11:52 +10:00
xfs_fsops.c xfs: growfs not aware of sb_meta_uuid 2015-08-19 10:31:41 +10:00
xfs_fsops.h
xfs_globals.c xfs: export log_recovery_delay to delay mount time log recovery 2014-09-09 11:56:13 +10:00
xfs_icache.c xfs: inodes are new until the dentry cache is set up 2015-02-23 22:38:08 +11:00
xfs_icache.h xfs: merge xfs_ag.h into xfs_format.h 2014-11-28 14:25:04 +11:00
xfs_icreate_item.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_icreate_item.h
xfs_inode_item.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_inode_item.h xfs: remove the inode log format from the inode log item 2013-12-13 11:34:05 +11:00
xfs_inode.c xfs: stop holding ILOCK over filldir callbacks 2015-08-19 10:33:00 +10:00
xfs_inode.h xfs: clean up inode lockdep annotations 2015-08-19 10:32:49 +10:00
xfs_ioctl32.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
xfs_ioctl32.h xfs: compat_xfs_bstat does not have forkoff 2014-10-02 09:17:58 +10:00
xfs_ioctl.c xfs: saner xfs_trans_commit interface 2015-06-04 13:48:08 +10:00
xfs_ioctl.h
xfs_iomap.c xfs: saner xfs_trans_commit interface 2015-06-04 13:48:08 +10:00
xfs_iomap.h xfs: pass a 64-bit count argument to xfs_iomap_write_unwritten 2015-01-09 10:48:12 +11:00
xfs_iops.c xfs: update for 4.2-rc1 2015-06-30 20:16:08 -07:00
xfs_iops.h xfs: inodes are new until the dentry cache is set up 2015-02-23 22:38:08 +11:00
xfs_itable.c xfs: use actual inode count for sparse records in bulkstat/inumbers 2015-05-29 09:04:19 +10:00
xfs_itable.h xfs: bulkstat chunk formatting cursor is broken 2014-11-07 08:30:30 +11:00
xfs_linux.h xfs: remove xfs_caddr_t 2015-06-22 09:45:10 +10:00
xfs_log_cil.c xfs: fix xfs_log_done interface 2015-06-04 13:48:20 +10:00
xfs_log_priv.h xfs: use void pointers in log validation helpers 2015-06-22 09:44:47 +10:00
xfs_log_recover.c xfs: log recovery needs to validate against sb_meta_uuid 2015-08-19 10:31:54 +10:00
xfs_log.c Merge branch 'xfs-misc-fixes-for-4.2-3' into for-next 2015-06-23 08:49:01 +10:00
xfs_log.h xfs: fix xfs_log_done interface 2015-06-04 13:48:20 +10:00
xfs_message.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_message.h
xfs_mount.c Merge branch 'xfs-sparse-inode' into for-next 2015-06-01 10:51:38 +10:00
xfs_mount.h Merge branch 'xfs-dax-support' into for-next 2015-06-04 13:01:49 +10:00
xfs_mru_cache.c xfs: xfs_mru_cache_insert() should use GFP_NOFS 2015-03-25 14:57:53 +11:00
xfs_mru_cache.h xfs: embedd mru_elem into parent structure 2014-04-23 07:11:51 +10:00
xfs_pnfs.c xfs: saner xfs_trans_commit interface 2015-06-04 13:48:08 +10:00
xfs_pnfs.h xfs: unlock i_mutex in xfs_break_layouts 2015-04-13 11:38:29 +10:00
xfs_qm_bhv.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_qm_syscalls.c xfs: saner xfs_trans_commit interface 2015-06-04 13:48:08 +10:00
xfs_qm.c xfs: saner xfs_trans_commit interface 2015-06-04 13:48:08 +10:00
xfs_qm.h xfs: Convert to using ->get_state callback 2015-03-04 16:06:36 +01:00
xfs_quota.h xfs: fix quota block reservation leak when tp allocates and frees blocks 2015-06-01 07:15:37 +10:00
xfs_quotaops.c xfs: Add support for Q_SETINFO 2015-03-04 16:06:38 +01:00
xfs_rtalloc.c xfs: saner xfs_trans_commit interface 2015-06-04 13:48:08 +10:00
xfs_rtalloc.h xfs: combine xfs_rtmodify_summary and xfs_rtget_summary 2014-09-09 11:58:42 +10:00
xfs_stats.c xfs: support the XFS_BTNUM_FINOBT free inode btree type 2014-04-24 16:00:52 +10:00
xfs_stats.h xfs: support the XFS_BTNUM_FINOBT free inode btree type 2014-04-24 16:00:52 +10:00
xfs_super.c xfs: relocate sparse inode mount warning 2015-08-19 10:32:14 +10:00
xfs_super.h xfs: Remove icsb infrastructure 2015-02-23 21:22:31 +11:00
xfs_symlink.c xfs: stop holding ILOCK over filldir callbacks 2015-08-19 10:33:00 +10:00
xfs_symlink.h xfs: push down inactive transaction mgmt for remote symlinks 2013-10-08 14:53:02 -05:00
xfs_sysctl.c xfs: remove deprecated sysctls 2015-01-09 10:47:43 +11:00
xfs_sysctl.h xfs: export log_recovery_delay to delay mount time log recovery 2014-09-09 11:56:13 +10:00
xfs_sysfs.c xfs: export log_recovery_delay to delay mount time log recovery 2014-09-09 11:56:13 +10:00
xfs_sysfs.h xfs: add debug sysfs attribute set 2014-09-09 11:52:42 +10:00
xfs_trace.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_trace.h xfs: allocate sparse inode chunks on full chunk allocation failure 2015-05-29 09:18:32 +10:00
xfs_trans_ail.c xfs: remove __psint_t and __psunsigned_t 2015-06-22 09:43:32 +10:00
xfs_trans_buf.c xfs: only trace buffer items if they exist 2015-02-10 09:23:40 +11:00
xfs_trans_dquot.c xfs: Clean up xfs_trans_dup_dqinfo 2015-06-01 10:50:00 +10:00
xfs_trans_extfree.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_trans_inode.c xfs: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_trans_priv.h xfs: pass a boolean flag to xfs_trans_free_items 2015-06-04 13:47:43 +10:00
xfs_trans.c xfs: fix xfs_log_done interface 2015-06-04 13:48:20 +10:00
xfs_trans.h xfs: saner xfs_trans_commit interface 2015-06-04 13:48:08 +10:00
xfs_xattr.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
xfs.h