Btrfs: add RAID 5/6 BTRFS_RBIO_REBUILD_MISSING operation

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The current RAID 5/6 recovery code isn't quite prepared to handle
missing devices. In particular, it expects a bio that we previously
attempted to use in the read path, meaning that it has valid pages
allocated. However, missing devices have a NULL blkdev, and we can't
call bio_add_page() on a bio with a NULL blkdev. We could do manual
manipulation of bio->bi_io_vec, but that's pretty gross. So instead, add
a separate path that allows us to manually add pages to the rbio.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

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This commit is contained in:

Omar Sandoval 2015-06-19 11:52:50 -07:00 • committed by Chris Mason

parent 7cb2c4202e

commit b4ee178268

3 changed files with 86 additions and 14 deletions

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87

fs/btrfs/raid56.c

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10

fs/btrfs/raid56.h

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3

fs/btrfs/scrub.c

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