xfs: report shared extent mappings to userspace correctly

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Report shared extents through the iomap interface so that FIEMAP flags
shared blocks accurately.  Have xfs_vm_bmap return zero for reflinked
files because the bmap-based swap code requires static block mappings,
which is incompatible with copy on write.

NOTE: Existing userspace bmap users such as lilo will have the same
problem with reflink files.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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This commit is contained in:

Darrick J. Wong 2016-10-03 09:11:36 -07:00

parent 43caeb187d

commit db1327b16c

2 changed files with 22 additions and 1 deletions

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11

fs/xfs/xfs_aops.c

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12

fs/xfs/xfs_iomap.c

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