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[PATCH] md: teach raid5 the difference between 'check' and 'repair'.

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With this, raid5 can be asked to check parity without repairing it.  It also
keeps a count of the number of incorrect parity blocks found (mismatches) and
reports them through sysfs.

Signed-off-by: Neil Brown <neilb@suse.de>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
2005-11-08 21:39:26 -08:00
committed by Linus Torvalds
parent 24dd469d72
commit 9d88883e68
3 changed files with 25 additions and 2 deletions
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5
drivers/md/raid5.c
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@ -1292,6 +1292,11 @@ static void handle_stripe(struct stripe_head *sh)
!memcmp(pagea, pagea+4, STRIPE_SIZE-4)) {
/* parity is correct (on disc, not in buffer any more) */
set_bit(STRIPE_INSYNC, &sh->state);
} else {
conf->mddev->resync_mismatches += STRIPE_SECTORS;
if (test_bit(MD_RECOVERY_CHECK, &conf->mddev->recovery))
/* don't try to repair!! */
set_bit(STRIPE_INSYNC, &sh->state);
}
}
if (!test_bit(STRIPE_INSYNC, &sh->state)) {