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| author | Darrick J. Wong | 2016-10-03 18:11:32 +0200 |
|---|---|---|
| committer | Darrick J. Wong | 2016-10-05 03:06:40 +0200 |
| commit | 3993baeb3c52f497d243a4a3b5510df97b22596b (patch) | |
| tree | 2dab55892137a064012b352a0f9ac730797221fb /fs/xfs/libxfs/xfs_bmap.h | |
| parent | xfs: don't allow reflinked dir/dev/fifo/socket/pipe files (diff) | |
| download | kernel-qcow2-linux-3993baeb3c52f497d243a4a3b5510df97b22596b.tar.gz kernel-qcow2-linux-3993baeb3c52f497d243a4a3b5510df97b22596b.tar.xz kernel-qcow2-linux-3993baeb3c52f497d243a4a3b5510df97b22596b.zip | |
xfs: introduce the CoW fork
Introduce a new in-core fork for storing copy-on-write delalloc
reservations and allocated extents that are in the process of being
written out.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/libxfs/xfs_bmap.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.h | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 85e3b9d91ade..87741274c114 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -107,6 +107,9 @@ struct xfs_extent_free_item */ #define XFS_BMAPI_REMAP 0x100 +/* Map something in the CoW fork. */ +#define XFS_BMAPI_COWFORK 0x200 + #define XFS_BMAPI_FLAGS \ { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ { XFS_BMAPI_METADATA, "METADATA" }, \ @@ -116,12 +119,23 @@ struct xfs_extent_free_item { XFS_BMAPI_CONTIG, "CONTIG" }, \ { XFS_BMAPI_CONVERT, "CONVERT" }, \ { XFS_BMAPI_ZERO, "ZERO" }, \ - { XFS_BMAPI_REMAP, "REMAP" } + { XFS_BMAPI_REMAP, "REMAP" }, \ + { XFS_BMAPI_COWFORK, "COWFORK" } static inline int xfs_bmapi_aflag(int w) { - return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0); + return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : + (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0)); +} + +static inline int xfs_bmapi_whichfork(int bmapi_flags) +{ + if (bmapi_flags & XFS_BMAPI_COWFORK) + return XFS_COW_FORK; + else if (bmapi_flags & XFS_BMAPI_ATTRFORK) + return XFS_ATTR_FORK; + return XFS_DATA_FORK; } /* @@ -142,13 +156,15 @@ static inline int xfs_bmapi_aflag(int w) #define BMAP_LEFT_VALID (1 << 6) #define BMAP_RIGHT_VALID (1 << 7) #define BMAP_ATTRFORK (1 << 8) +#define BMAP_COWFORK (1 << 9) #define XFS_BMAP_EXT_FLAGS \ { BMAP_LEFT_CONTIG, "LC" }, \ { BMAP_RIGHT_CONTIG, "RC" }, \ { BMAP_LEFT_FILLING, "LF" }, \ { BMAP_RIGHT_FILLING, "RF" }, \ - { BMAP_ATTRFORK, "ATTR" } + { BMAP_ATTRFORK, "ATTR" }, \ + { BMAP_COWFORK, "COW" } /* |