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xfs: map an inode's offset to an exact physical block

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Teach the bmap routine to know how to map a range of file blocks to a
specific range of physical blocks, instead of simply allocating fresh
blocks.  This enables reflink to map a file to blocks that are already
in use.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong
2016-10-03 09:11:27 -07:00
parent 77d61fe45e
commit f65306ea52
3 changed files with 131 additions and 1 deletions
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10
fs/xfs/libxfs/xfs_bmap.h
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@@ -97,6 +97,13 @@ struct xfs_extent_free_item
*/
#define XFS_BMAPI_ZERO 0x080
/*
* Map the inode offset to the block given in ap->firstblock. Primarily
* used for reflink. The range must be in a hole, and this flag cannot be
* turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
*/
#define XFS_BMAPI_REMAP 0x100
#define XFS_BMAPI_FLAGS \
{ XFS_BMAPI_ENTIRE, "ENTIRE" }, \
{ XFS_BMAPI_METADATA, "METADATA" }, \
@@ -105,7 +112,8 @@ struct xfs_extent_free_item
{ XFS_BMAPI_IGSTATE, "IGSTATE" }, \
{ XFS_BMAPI_CONTIG, "CONTIG" }, \
{ XFS_BMAPI_CONVERT, "CONVERT" }, \
{ XFS_BMAPI_ZERO, "ZERO" }
{ XFS_BMAPI_ZERO, "ZERO" }, \
{ XFS_BMAPI_REMAP, "REMAP" }
static inline int xfs_bmapi_aflag(int w)