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xfs: implement the GETFSMAP ioctl

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Introduce a new ioctl that uses the reverse mapping btree to return
information about the physical layout of the filesystem.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2017-03-28 14:56:37 -07:00
commit e89c041338
12 changed files with 1048 additions and 0 deletions
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