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51446f5ba4
linux/fs/xfs
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Christoph Hellwig 51446f5ba4 xfs: rewrite and optimize the delalloc write path 
Currently xfs_iomap_write_delay does up to lookups in the inode
extent tree, which is rather costly especially with the new iomap
based write path and small write sizes.

But it turns out that the low-level xfs_bmap_search_extents gives us
all the information we need in the regular delalloc buffered write
path:

 - it will return us an extent covering the block we are looking up
   if it exists.  In that case we can simply return that extent to
   the caller and are done
 - it will tell us if we are beyoned the last current allocated
   block with an eof return parameter.  In that case we can create a
   delalloc reservation and use the also returned information about
   the last extent in the file as the hint to size our delalloc
   reservation.
 - it can tell us that we are writing into a hole, but that there is
   an extent beyoned this hole.  In this case we can create a
   delalloc reservation that covers the requested size (possible
   capped to the next existing allocation).

All that can be done in one single routine instead of bouncing up
and down a few layers.  This reduced the CPU overhead of the block
mapping routines and also simplified the code a lot.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
2016-09-19 11:10:21 +10:00
..
libxfs xfs: rewrite and optimize the delalloc write path 2016-09-19 11:10:21 +10:00
Kconfig xfs: implement iomap based buffered write path 2016-06-21 09:53:44 +10:00
kmem.c xfs: improve kmem_realloc 2016-04-06 09:47:01 +10:00
kmem.h xfs: improve kmem_realloc 2016-04-06 09:47:01 +10:00
Makefile xfs: reverse block mapping support for 4.8-rc1 2016-08-06 09:50:36 -04:00
mrlock.h
uuid.c
uuid.h
xfs_acl.c posix_acl: Inode acl caching fixes 2016-03-31 00:30:15 -04:00
xfs_acl.h xfs: Change how listxattr generates synthetic attributes 2015-12-06 21:34:16 -05:00
xfs_aops.c xfs: update for 4.8-rc1 2016-07-27 09:53:35 -07:00
xfs_aops.h xfs: direct calls in the direct I/O path 2016-07-20 11:38:01 +10:00
xfs_attr_inactive.c xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_attr_list.c xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_attr.h xfs: remove put_value from attr ->put_listent context 2016-04-06 07:57:45 +10:00
xfs_bmap_util.c xfs: disable XFS_IOC_SWAPEXT when rmap btree is enabled 2016-08-03 12:18:07 +10:00
xfs_bmap_util.h xfs: change xfs_bmap_{finish,cancel,init,free} -> xfs_defer_* 2016-08-03 11:18:10 +10:00
xfs_buf_item.c Merge branch 'xfs-4.8-misc-fixes-4' into for-next 2016-07-22 14:10:56 +10:00
xfs_buf_item.h
xfs_buf.c xfs: prevent dropping ioend completions during buftarg wait 2016-08-26 16:01:59 +10:00
xfs_buf.h xfs: track and serialize in-flight async buffers against unmount 2016-07-20 11:15:28 +10:00
xfs_dir2_readdir.c xfs: concurrent readdir hangs on data buffer locks 2016-05-18 13:20:21 -04:00
xfs_discard.c xfs: rmap btree requires more reserved free space 2016-08-03 11:38:24 +10:00
xfs_discard.h
xfs_dquot_item.c xfs: allocate log vector buffers outside CIL context lock 2016-07-22 09:52:35 +10:00
xfs_dquot_item.h
xfs_dquot.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_dquot.h
xfs_error.c Merge branch 'xfs-4.8-misc-fixes-3' into for-next 2016-07-20 11:51:08 +10:00
xfs_error.h xfs: propagate bmap updates to rmapbt 2016-08-03 12:16:05 +10:00
xfs_export.c xfs: abstract block export operations from nfsd layouts 2016-07-15 15:31:29 -04:00
xfs_export.h
xfs_extent_busy.c
xfs_extent_busy.h
xfs_extfree_item.c xfs: remove unnecessary parentheses from log redo item recovery functions 2016-08-03 12:29:32 +10:00
xfs_extfree_item.h xfs: refactor redo intent item processing 2016-08-03 11:23:49 +10:00
xfs_file.c xfs: don't invalidate whole file on DAX read/write 2016-08-17 08:31:33 +10:00
xfs_filestream.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_filestream.h
xfs_fsops.c xfs: store rmapbt block count in the AGF 2016-08-17 08:31:49 +10:00
xfs_fsops.h xfs: remove unused function definitions 2016-02-08 14:58:07 +11:00
xfs_globals.c
xfs_icache.c xfs: make xfs_inode_set_eofblocks_tag cheaper for the common case 2016-09-19 11:09:48 +10:00
xfs_icache.h xfs: cancel eofblocks background trimming on remount read-only 2016-06-21 11:53:28 +10:00
xfs_icreate_item.c
xfs_icreate_item.h
xfs_inode_item.c xfs: allocate log vector buffers outside CIL context lock 2016-07-22 09:52:35 +10:00
xfs_inode_item.h xfs: remove timestamps from incore inode 2016-02-09 16:54:58 +11:00
xfs_inode.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_inode.h xfs: make xfs_inode_set_eofblocks_tag cheaper for the common case 2016-09-19 11:09:48 +10:00
xfs_ioctl32.c xfs: don't pass ioflags around in the ioctl path 2016-07-20 11:29:35 +10:00
xfs_ioctl32.h
xfs_ioctl.c fs: return EPERM on immutable inode 2016-08-07 10:03:31 -04:00
xfs_ioctl.h xfs: don't pass ioflags around in the ioctl path 2016-07-20 11:29:35 +10:00
xfs_iomap.c xfs: rewrite and optimize the delalloc write path 2016-09-19 11:10:21 +10:00
xfs_iomap.h xfs: rewrite and optimize the delalloc write path 2016-09-19 11:10:21 +10:00
xfs_iops.c xfs: (re-)implement FIEMAP_FLAG_XATTR 2016-08-17 08:45:30 +10:00
xfs_iops.h
xfs_itable.c xfs: mode di_mode to vfs inode 2016-02-09 16:54:58 +11:00
xfs_itable.h
xfs_linux.h xfs: remove __arch_pack 2016-07-20 11:48:46 +10:00
xfs_log_cil.c xfs: allocate log vector buffers outside CIL context lock 2016-07-22 09:52:35 +10:00
xfs_log_priv.h xfs: remove transaction types 2016-04-06 09:20:36 +10:00
xfs_log_recover.c xfs: remove the extents array from the rmap update done log item 2016-08-03 12:28:43 +10:00
xfs_log.c Merge branch 'xfs-4.8-buf-fixes' into for-next 2016-07-20 11:53:35 +10:00
xfs_log.h xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_message.c xfs: more info from kmem deadlocks and high-level error msgs 2015-10-12 16:04:45 +11:00
xfs_message.h
xfs_mount.c xfs: rmap btree requires more reserved free space 2016-08-03 11:38:24 +10:00
xfs_mount.h xfs: rmap btree requires more reserved free space 2016-08-03 11:38:24 +10:00
xfs_mru_cache.c
xfs_mru_cache.h
xfs_ondisk.h xfs: define the on-disk rmap btree format 2016-08-03 11:36:07 +10:00
xfs_pnfs.c xfs: make xfs_bmbt_to_iomap available outside of xfs_pnfs.c 2016-06-21 09:52:47 +10:00
xfs_pnfs.h xfs: abstract block export operations from nfsd layouts 2016-07-15 15:31:29 -04:00
xfs_qm_bhv.c
xfs_qm_syscalls.c xfs: better xfs_trans_alloc interface 2016-04-06 09:19:55 +10:00
xfs_qm.c xfs: better xfs_trans_alloc interface 2016-04-06 09:19:55 +10:00
xfs_qm.h xfs: Split default quota limits by quota type 2016-02-08 11:27:55 +11:00
xfs_quota.h
xfs_quotaops.c xfs: wire up Q_XGETNEXTQUOTA / get_nextdqblk 2016-02-08 11:27:38 +11:00
xfs_rmap_item.c xfs: remove unnecessary parentheses from log redo item recovery functions 2016-08-03 12:29:32 +10:00
xfs_rmap_item.h xfs: remove the extents array from the rmap update done log item 2016-08-03 12:28:43 +10:00
xfs_rtalloc.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_rtalloc.h xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_stats.c xfs: reverse block mapping support for 4.8-rc1 2016-08-06 09:50:36 -04:00
xfs_stats.h xfs: add rmap btree stats infrastructure 2016-08-03 11:31:11 +10:00
xfs_super.c xfs: disallow mounting of realtime + rmap filesystems 2016-08-26 15:59:19 +10:00
xfs_super.h xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_symlink.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_symlink.h
xfs_sysctl.c
xfs_sysctl.h
xfs_sysfs.c xfs: fix xfs_error_get_cfg for negative errnos 2016-07-20 10:48:51 +10:00
xfs_sysfs.h xfs: configurable error behavior via sysfs 2016-05-18 10:58:51 +10:00
xfs_trace.c xfs: rework xfs_bmap_free callers to use xfs_defer_ops 2016-08-03 11:15:38 +10:00
xfs_trace.h xfs: track log done items directly in the deferred pending work item 2016-08-30 13:51:39 +10:00
xfs_trans_ail.c xfs: Make xfsaild freezeable again 2016-02-08 14:59:07 +11:00
xfs_trans_buf.c xfs: remove XBF_STALE flag wrapper macros 2016-02-10 15:01:11 +11:00
xfs_trans_dquot.c xfs: Split default quota limits by quota type 2016-02-08 11:27:55 +11:00
xfs_trans_extfree.c xfs: move (and rename) the deferred bmap-free tracepoints 2016-08-03 12:31:07 +10:00
xfs_trans_inode.c xfs: move di_changecount to VFS inode 2016-02-09 16:54:58 +11:00
xfs_trans_priv.h
xfs_trans_rmap.c xfs: collapse single use static functions 2016-08-03 12:30:31 +10:00
xfs_trans.c xfs: remove transaction types 2016-04-06 09:20:36 +10:00
xfs_trans.h xfs: remove the extents array from the rmap update done log item 2016-08-03 12:28:43 +10:00
xfs_xattr.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-05-27 17:14:05 -07:00
xfs.h