xfs: add helpers to collect and sift btree block pointers during repair

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Add some helpers to assemble a list of fs block extents.  Generally,
repair functions will iterate the rmapbt to make a list (1) of all
extents owned by the nominal owner of the metadata structure; then they
will iterate all other structures with the same rmap owner to make a
list (2) of active blocks; and finally we have a subtraction function to
subtract all the blocks in (2) from (1), with the result that (1) is now
a list of blocks that were owned by the old btree and must be disposed.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

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Darrick J. Wong 2018-05-29 22:18:09 -07:00

parent 73d6b42aa4

commit 64a39d876e

2 changed files with 245 additions and 0 deletions

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217

fs/xfs/scrub/repair.c

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28

fs/xfs/scrub/repair.h

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