tree 58b0c604f4f4e55523d2c93971f79d80e406b9ce
parent 703ebe86a999861e833be4015aaf552837e9613a
author NeilBrown <neilb@suse.de> 1131514762 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1131551796 -0800

[PATCH] md: better handling of readerrors with raid5.

This patch changes the behaviour of raid5 when it gets a read error.
Instead of just failing the device, it tried to find out what should have
been there, and writes it over the bad block.  For some media-errors, this
has a reasonable chance of fixing the error.  If the write succeeds, and a
subsequent read succeeds as well, raid5 decided the address is OK and
conitnues.

Instead of failing a drive on read-error, we attempt to re-write the block,
and then re-read.  If that all works, we allow the device to remain in the
array.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>