tree e1bea8143538fc3eaeeb8578c2f9231e32809a25
parent efeb53c0e57213e843b7ef3cc6ebcdea7d6186ac
author NeilBrown <neilb@suse.de> 1231450271 +1100
committer NeilBrown <neilb@suse.de> 1231450271 +1100

md: don't retry recovery of raid1 that fails due to error on source drive.

If a raid1 has only one working drive and it has a sector which
gives an error on read, then an attempt to recover onto a spare will
fail, but as the single remaining drive is not removed from the
array, the recovery will be immediately re-attempted, resulting
in an infinite recovery loop.

So detect this situation and don't retry recovery once an error
on the lone remaining drive is detected.

Allow recovery to be retried once every time a spare is added
in case the problem wasn't actually a media error.

Signed-off-by: NeilBrown <neilb@suse.de>