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xfs: add online discard support

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Now that we have reliably tracking of deleted extents in a
transaction we can easily implement "online" discard support
which calls blkdev_issue_discard once a transaction commits.

The actual discard is a two stage operation as we first have
to mark the busy extent as not available for reuse before we
can start the actual discard.  Note that we don't bother
supporting discard for the non-delaylog mode.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig
2011-05-20 13:45:32 +00:00
committed by Alex Elder
parent bf59170a66
commit e84661aa84
10 changed files with 96 additions and 8 deletions
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6
Documentation/filesystems/xfs.txt
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@@ -39,6 +39,12 @@ When mounting an XFS filesystem, the following options are accepted.
drive level write caching to be enabled, for devices that
support write barriers.
discard
Issue command to let the block device reclaim space freed by the
filesystem. This is useful for SSD devices, thinly provisioned
LUNs and virtual machine images, but may have a performance
impact. This option is incompatible with the nodelaylog option.
dmapi
Enable the DMAPI (Data Management API) event callouts.
Use with the "mtpt" option.