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52 Commits

Author SHA1 Message Date
Darrick J. Wong
a1cae7283d xfs: have getfsmap fall back to the freesp btrees when rmap is not present 
If the reverse-mapping btree isn't available, fall back to the
free space btrees to provide partial reverse mapping information.
The online scrub tool can make use of even partial information to
speed up the data block scan.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
 2017-04-03 15:18:18 -07:00
Darrick J. Wong
e89c041338 xfs: implement the GETFSMAP ioctl 
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>
 2017-04-03 15:18:17 -07:00