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Darrick J. Wong 0613f16cd2 xfs: implement CoW for directio writes 
For O_DIRECT writes to shared blocks, we have to CoW them just like
we would with buffered writes.  For writes that are not block-aligned,
just bounce them to the page cache.

For block-aligned writes, however, we can do better than that.  Use
the same mechanisms that we employ for buffered CoW to set up a
delalloc reservation, allocate all the blocks at once, issue the
writes against the new blocks and use the same ioend functions to
remap the blocks after the write.  This should be fairly performant.

Christoph discovered that xfs_reflink_allocate_cow_range may stumble
over invalid entries in the extent array given that it drops the ilock
but still expects the index to be stable.  Simple fixing it to a new
lookup for every iteration still isn't correct given that
xfs_bmapi_allocate will trigger a BUG_ON() if hitting a hole, and
there is nothing preventing a xfs_bunmapi_cow call removing extents
once we dropped the ilock either.

This patch duplicates the inner loop of xfs_bmapi_allocate into a
helper for xfs_reflink_allocate_cow_range so that it can be done under
the same ilock critical section as our CoW fork delayed allocation.
The directio CoW warts will be revisited in a later patch.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2016-10-05 16:26:04 -07:00
..
libxfs xfs: support removing extents from CoW fork 2016-10-05 13:55:40 -07:00
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: introduce the CoW fork 2016-10-04 18:06:40 -07:00
mrlock.h
uuid.c
uuid.h
xfs.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: implement CoW for directio writes 2016-10-05 16:26:04 -07:00
xfs_aops.h xfs: allocate delayed extents in CoW fork 2016-10-04 18:06:41 -07:00
xfs_attr.h xfs: remove put_value from attr ->put_listent context 2016-04-06 07:57:45 +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_bmap_item.c xfs: when replaying bmap operations, don't let unlinked inodes get reaped 2016-10-04 11:05:44 -07:00
xfs_bmap_item.h xfs: log bmap intent items 2016-10-04 11:05:44 -07:00
xfs_bmap_util.c xfs: remote attribute blocks aren't really userdata 2016-09-26 08:21:28 +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.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_buf_item.c xfs: normalize "infinite" retries in error configs 2016-09-14 07:51:30 +10:00
xfs_buf_item.h xfs: fix non-debug build warnings 2015-08-25 10:05:13 +10:00
xfs_dir2_readdir.c xfs: return an error when an inline directory is too small 2016-10-03 09:11:15 -07:00
xfs_discard.c xfs: rmap btree requires more reserved free space 2016-08-03 11:38:24 +10:00
xfs_discard.h
xfs_dquot.c xfs: rename flist/free_list to dfops 2016-08-03 11:19:29 +10:00
xfs_dquot.h xfs: fix implicit bool to int conversion 2015-01-09 10:48:58 +11:00
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_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: implement deferred bmbt map/unmap operations 2016-10-04 11:05:44 -07:00
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: remote attribute blocks aren't really userdata 2016-09-26 08:21:28 +10:00
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: implement CoW for directio writes 2016-10-05 16:26:04 -07:00
xfs_filestream.c Merge branch 'xfs-4.9-log-recovery-fixes' into for-next 2016-10-03 09:56:28 +11:00
xfs_filestream.h
xfs_fsops.c xfs: add reflink feature flag to geometry 2016-10-04 18:06:40 -07:00
xfs_fsops.h xfs: remove unused function definitions 2016-02-08 14:58:07 +11:00
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: introduce the CoW fork 2016-10-04 18:06:40 -07:00
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: move most of xfs_sb.h to xfs_format.h 2014-11-28 14:27:09 +11:00
xfs_icreate_item.h
xfs_inode.c xfs: when replaying bmap operations, don't let unlinked inodes get reaped 2016-10-04 11:05:44 -07:00
xfs_inode.h xfs: introduce the CoW fork 2016-10-04 18:06:40 -07:00
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_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_ioctl32.c xfs: don't pass ioflags around in the ioctl path 2016-07-20 11:29:35 +10:00
xfs_ioctl32.h xfs: compat_xfs_bstat does not have forkoff 2014-10-02 09:17:58 +10:00
xfs_iomap.c xfs: report shared extent mappings to userspace correctly 2016-10-05 16:26:04 -07:00
xfs_iomap.h xfs: support allocating delayed extents in CoW fork 2016-10-04 18:06:41 -07:00
xfs_iops.c xfs: (re-)implement FIEMAP_FLAG_XATTR 2016-08-17 08:45:30 +10:00
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: mode di_mode to vfs inode 2016-02-09 16:54:58 +11:00
xfs_itable.h xfs: bulkstat chunk formatting cursor is broken 2014-11-07 08:30:30 +11:00
xfs_linux.h xfs: remove __arch_pack 2016-07-20 11:48:46 +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_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: rework log recovery to submit buffers on LSN boundaries 2016-09-26 08:22:16 +10:00
xfs_log_recover.c xfs: when replaying bmap operations, don't let unlinked inodes get reaped 2016-10-04 11:05:44 -07:00
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: when replaying bmap operations, don't let unlinked inodes get reaped 2016-10-04 11:05:44 -07:00
xfs_mount.h xfs: define the on-disk refcount btree format 2016-10-03 09:11:18 -07:00
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_ondisk.h xfs: define the on-disk refcount btree format 2016-10-03 09:11:18 -07:00
xfs_pnfs.c xfs: introduce refcount btree definitions 2016-10-03 09:11:16 -07:00
xfs_pnfs.h xfs: abstract block export operations from nfsd layouts 2016-07-15 15:31:29 -04:00
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_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: better xfs_trans_alloc interface 2016-04-06 09:19:55 +10:00
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: wire up Q_XGETNEXTQUOTA / get_nextdqblk 2016-02-08 11:27:38 +11:00
xfs_refcount_item.c xfs: connect refcount adjust functions to upper layers 2016-10-03 09:11:22 -07:00
xfs_refcount_item.h xfs: log refcount intent items 2016-10-03 09:11:21 -07:00
xfs_reflink.c xfs: implement CoW for directio writes 2016-10-05 16:26:04 -07:00
xfs_reflink.h xfs: implement CoW for directio writes 2016-10-05 16:26:04 -07:00
xfs_rmap_item.c xfs: convert RUI log formats to use variable length arrays 2016-09-19 10:24:27 +10:00
xfs_rmap_item.h xfs: convert RUI log formats to use variable length arrays 2016-09-19 10:24:27 +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: introduce refcount btree definitions 2016-10-03 09:11:16 -07:00
xfs_stats.h xfs: introduce refcount btree definitions 2016-10-03 09:11:16 -07:00
xfs_super.c xfs: when replaying bmap operations, don't let unlinked inodes get reaped 2016-10-04 11:05:44 -07:00
xfs_super.h xfs: quiesce the filesystem after recovery on readonly mount 2016-09-26 08:21:44 +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: pass xfsstats structures to handlers and macros 2015-10-12 05:19:45 +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: normalize "infinite" retries in error configs 2016-09-14 07:51:30 +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: implement CoW for directio writes 2016-10-05 16:26:04 -07:00
xfs_trans.c Merge branch 'xfs-4.9-reflink-prep' into for-next 2016-10-03 09:52:31 +11:00
xfs_trans.h xfs: implement deferred bmbt map/unmap operations 2016-10-04 11:05:44 -07:00
xfs_trans_ail.c xfs: Make xfsaild freezeable again 2016-02-08 14:59:07 +11:00
xfs_trans_bmap.c xfs: implement deferred bmbt map/unmap operations 2016-10-04 11:05:44 -07:00
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: set up per-AG free space reservations 2016-09-19 10:30:52 +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: add helper to conditionally remove items from the AIL 2015-08-19 10:01:08 +10:00
xfs_trans_refcount.c xfs: connect refcount adjust functions to upper layers 2016-10-03 09:11:22 -07:00
xfs_trans_rmap.c xfs: collapse single use static functions 2016-08-03 12:30:31 +10:00
xfs_xattr.c Make __xfs_xattr_put_listen preperly report errors. 2016-09-14 07:40:35 +10:00