[PATCH] md: teach raid5 the difference between 'check' and 'repair'.
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>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 3740087..e58d61d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1758,16 +1758,29 @@
return len;
}
+static ssize_t
+md_show_mismatch(mddev_t *mddev, char *page)
+{
+ return sprintf(page, "%llu\n",
+ (unsigned long long) mddev->resync_mismatches);
+}
+
static struct md_sysfs_entry md_scan_mode = {
.attr = {.name = "scan_mode", .mode = S_IRUGO|S_IWUSR },
.show = md_show_scan,
.store = md_store_scan,
};
+static struct md_sysfs_entry md_mismatches = {
+ .attr = {.name = "mismatch_cnt", .mode = S_IRUGO },
+ .show = md_show_mismatch,
+};
+
static struct attribute *md_default_attrs[] = {
&md_level.attr,
&md_raid_disks.attr,
&md_scan_mode.attr,
+ &md_mismatches.attr,
NULL,
};
@@ -3888,12 +3901,13 @@
}
} while (mddev->curr_resync < 2);
- if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
/* resync follows the size requested by the personality,
* which defaults to physical size, but can be virtual size
*/
max_sectors = mddev->resync_max_sectors;
- else
+ mddev->resync_mismatches = 0;
+ } else
/* recovery follows the physical size of devices */
max_sectors = mddev->size << 1;