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xfs: wire up Q_XGETNEXTQUOTA / get_nextdqblk

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Add code to allow the Q_XGETNEXTQUOTA quotactl to quickly find
all active quotas by examining the quota inode, and skipping
over unallocated or uninitialized regions.

Userspace can then use this interface rather than i.e. a
getpwent() loop when asked to report all active quotas.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Eric Sandeen 2016-02-08 11:27:38 +11:00 • committed by Dave Chinner
commit 296c24e26e
5 changed files with 142 additions and 9 deletions
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