btrfs: repair all known bad mirrors

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When there is more than a single level of redundancy there can also be
multiple bad mirrors, and the current read repair code only repairs the
last bad one.

Restructure btrfs_repair_one_sector so that it records the originally
failed mirror and the number of copies, and then repair all known bad
copies until we reach the originally failed copy in clean_io_failure.
Note that this also means the read repair reads will always start from
the next bad mirror and not mirror 0.

This fixes btrfs/265 in xfstests.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

Christoph Hellwig 2022-07-07 07:33:26 +02:00 • committed by David Sterba

parent d28beb3e81

commit c144c63fd3

2 changed files with 61 additions and 66 deletions

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126

fs/btrfs/extent_io.c

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1

fs/btrfs/extent_io.h

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