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Btrfs: replace: cache rbio when rebuild data on missing device 

Rebuild on missing device is as same as recover, after it's done, rbio
has data which is consistent with on-disk data, so it can be cached to
avoid further reads.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2018-03-22 09:20:11 +08:00 committed by David Sterba
parent 8a5a916d9a
commit 580c6efaf9
1 changed files with 7 additions and 3 deletions
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10
fs/btrfs/raid56.c
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@ -1987,7 +1987,13 @@ cleanup:
kfree(pointers);
cleanup_io:
if (rbio->operation == BTRFS_RBIO_READ_REBUILD) {
/*
* Similar to READ_REBUILD, REBUILD_MISSING at this point also has a
* valid rbio which is consistent with ondisk content, thus such a
* valid rbio can be cached to avoid further disk reads.
*/
if (rbio->operation == BTRFS_RBIO_READ_REBUILD ||
rbio->operation == BTRFS_RBIO_REBUILD_MISSING) {
/*
* - In case of two failures, where rbio->failb != -1:
*
@ -2008,8 +2014,6 @@ cleanup_io:
else
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
rbio_orig_end_io(rbio, err);
} else if (rbio->operation == BTRFS_RBIO_REBUILD_MISSING) {
rbio_orig_end_io(rbio, err);
} else if (err == BLK_STS_OK) {
rbio->faila = -1;