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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2016-10-03 09:11:34 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2016-10-04 18:06:41 -0700 |
| commit | ef4736678fc3ea426968bc82f907798ed5f51e85 (patch) | |
| tree | 8a1525ef991d72cf833030e0ff081a91f27cbeed /fs/xfs/xfs_aops.h | |
| parent | 60b4984fc3924bff292ec46b95a3e98b34b8e259 (diff) | |
| download | linux-ef4736678fc3ea426968bc82f907798ed5f51e85.tar.gz linux-ef4736678fc3ea426968bc82f907798ed5f51e85.tar.bz2 linux-ef4736678fc3ea426968bc82f907798ed5f51e85.zip | |
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.h | 4 |
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. |