btrfs: scrub: implement raid stripe tree support

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A filesystem that uses the raid stripe tree for logical to physical
address translation can't use the regular scrub path, that reads all
stripes and then checks if a sector is unused afterwards.

When using the raid stripe tree, this will result in lookup errors, as
the stripe tree doesn't know the requested logical addresses.

In case we're scrubbing a filesystem which uses the RAID stripe tree for
multi-device logical to physical address translation, perform an extra
block mapping step to get the real on-disk stripe length from the stripe
tree when scrubbing the sectors.

This prevents a double completion of the btrfs_bio caused by splitting the
underlying bio and ultimately a use-after-free.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Johannes Thumshirn 2023-09-14 09:07:01 -07:00 • committed by David Sterba

parent 10e27980f2

commit 9acaa64187

4 changed files with 80 additions and 1 deletions

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2

fs/btrfs/bio.c

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7

fs/btrfs/raid-stripe-tree.c

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71

fs/btrfs/scrub.c

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1

fs/btrfs/volumes.h

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