diff options
| author | Christoph Hellwig <hch@lst.de> | 2018-07-11 22:25:59 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-07-11 22:25:59 -0700 |
| commit | 5c665e5b5af6b8ad3e38ee73cb495ec695bcf589 (patch) | |
| tree | 6c19fff57b24ed5065d436bdec21e9c366f8072d /fs/xfs/xfs_aops.h | |
| parent | fca8c805425c0d9435097a6c780e95332e54613a (diff) | |
xfs: remove xfs_map_cow
We can handle the existing cow mapping case as a special case directly
in xfs_writepage_map, and share code for allocating delalloc blocks
with regular I/O in xfs_map_blocks. This means we need to always
call xfs_map_blocks for reflink inodes, but we can still skip most of
the work if it turns out that there is no COW mapping overlapping the
current block.
As a subtle detail we need to start caching holes in the wpc to deal
with the case of COW reservations between EOF. But we'll need that
infrastructure later anyway, so this is no big deal.
Based on a patch from Dave Chinner.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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 25bc6d4a1231..9af867951a10 100644 --- a/fs/xfs/xfs_aops.h +++ b/fs/xfs/xfs_aops.h @@ -17,6 +17,7 @@ enum { XFS_IO_UNWRITTEN, /* covers allocated but uninitialized data */ XFS_IO_OVERWRITE, /* covers already allocated extent */ XFS_IO_COW, /* covers copy-on-write extent */ + XFS_IO_HOLE, /* covers region without any block allocation */ }; #define XFS_IO_TYPES \ @@ -24,7 +25,8 @@ enum { { XFS_IO_DELALLOC, "delalloc" }, \ { XFS_IO_UNWRITTEN, "unwritten" }, \ { XFS_IO_OVERWRITE, "overwrite" }, \ - { XFS_IO_COW, "CoW" } + { XFS_IO_COW, "CoW" }, \ + { XFS_IO_HOLE, "hole" } /* * Structure for buffered I/O completions. |