summaryrefslogtreecommitdiffstats
path: root/fs/xfs/libxfs/xfs_bmap.h
diff options
context:
space:
mode:
authorDarrick J. Wong <darrick.wong@oracle.com>2016-10-03 09:11:27 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2016-10-04 11:05:44 -0700
commitf65306ea5246ef3ff68a6abf85f5a73a04903366 (patch)
tree2c2f8ae61ce162c8c79cd5b8ea86266331ec83a6 /fs/xfs/libxfs/xfs_bmap.h
parent77d61fe45e720577a2cc0e9580fbc57d8faa7232 (diff)
downloadlinux-f65306ea5246ef3ff68a6abf85f5a73a04903366.tar.gz
linux-f65306ea5246ef3ff68a6abf85f5a73a04903366.tar.bz2
linux-f65306ea5246ef3ff68a6abf85f5a73a04903366.zip
xfs: map an inode's offset to an exact physical block
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>
Diffstat (limited to 'fs/xfs/libxfs/xfs_bmap.h')
-rw-r--r--fs/xfs/libxfs/xfs_bmap.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
index 7219207d58eb..8e69b5329629 100644
--- a/fs/xfs/libxfs/xfs_bmap.h
+++ b/fs/xfs/libxfs/xfs_bmap.h
@@ -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)