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authorDarrick J. Wong <darrick.wong@oracle.com>2016-10-03 09:11:34 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2016-10-04 18:06:41 -0700
commitef4736678fc3ea426968bc82f907798ed5f51e85 (patch)
tree8a1525ef991d72cf833030e0ff081a91f27cbeed /fs/xfs/xfs_aops.h
parent60b4984fc3924bff292ec46b95a3e98b34b8e259 (diff)
downloadlinux-ef4736678fc3ea426968bc82f907798ed5f51e85.tar.bz2
xfs: allocate delayed extents in CoW fork
Modify the writepage handler to find and convert pending delalloc extents to real allocations. Furthermore, when we're doing non-cow writes to a part of a file that already has a CoW reservation (the cowextsz hint that we set up in a subsequent patch facilitates this), promote the write to copy-on-write so that the entire extent can get written out as a single extent on disk, thereby reducing post-CoW fragmentation. Christoph moved the CoW support code in _map_blocks to a separate helper function, refactored other functions, and reduced the number of CoW fork lookups, so I merged those changes here to reduce churn. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_aops.h')
-rw-r--r--fs/xfs/xfs_aops.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h
index 1950e3bca2ac..b3c6634f9518 100644
--- a/fs/xfs/xfs_aops.h
+++ b/fs/xfs/xfs_aops.h
@@ -28,13 +28,15 @@ enum {
XFS_IO_DELALLOC, /* covers delalloc region */
XFS_IO_UNWRITTEN, /* covers allocated but uninitialized data */
XFS_IO_OVERWRITE, /* covers already allocated extent */
+ XFS_IO_COW, /* covers copy-on-write extent */
};
#define XFS_IO_TYPES \
{ XFS_IO_INVALID, "invalid" }, \
{ XFS_IO_DELALLOC, "delalloc" }, \
{ XFS_IO_UNWRITTEN, "unwritten" }, \
- { XFS_IO_OVERWRITE, "overwrite" }
+ { XFS_IO_OVERWRITE, "overwrite" }, \
+ { XFS_IO_COW, "CoW" }
/*
* Structure for buffered I/O completions.