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authorDarrick J. Wong <darrick.wong@oracle.com>2016-08-03 04:16:05 +0200
committerDave Chinner <david@fromorbit.com>2016-08-03 04:16:05 +0200
commit9c19464469556a0cd342fc40a24926ab46d7d243 (patch)
treec4cd6d84d5e799734cefc169ef627103b485d511 /Documentation/phy
parentxfs: enable the xfs_defer mechanism to process rmaps to update (diff)
downloadlinux-9c19464469556a0cd342fc40a24926ab46d7d243.tar.xz
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xfs: propagate bmap updates to rmapbt
When we map, unmap, or convert an extent in a file's data or attr fork, schedule a respective update in the rmapbt. Previous versions of this patch required a 1:1 correspondence between bmap and rmap, but this is no longer true as we now have ability to make interval queries against the rmapbt. We use the deferred operations code to handle redo operations atomically and deadlock free. This plumbs in all five rmap actions (map, unmap, convert extent, alloc, free); we'll use the first three now for file data, and reflink will want the last two. We also add an error injection site to test log recovery. Finally, we need to fix the bmap shift extent code to adjust the rmaps correctly. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
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