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ext4: support GETFSMAP ioctls

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Support the GETFSMAP ioctls so that we can use the xfs free space
management tools to probe ext4 as well.  Note that this is a partial
implementation -- we only report fixed-location metadata and free space;
everything else is reported as "unknown".

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Darrick J. Wong 2017-04-30 00:36:53 -04:00 • committed by Theodore Ts'o
commit 0c9ec4beec
8 changed files with 1027 additions and 5 deletions
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