[PATCH] md: allow a manual resync with md
You can trigger a 'check' with
echo check > /sys/block/mdX/md/scan_mode
or a check-and-repair errors with
echo repair > /sys/block/mdX/md/scan_mode
and read the current state from the same file.
Note: personalities need to know the different between 'check' and 'repair',
but don't yet. Until they do, 'check' will be the same as 'repair' and will
just do a normal resync pass.
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 74520b5..3740087 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1714,9 +1714,60 @@
.show = md_show_rdisks,
};
+static ssize_t
+md_show_scan(mddev_t *mddev, char *page)
+{
+ char *type = "none";
+ if (mddev->recovery &
+ ((1<<MD_RECOVERY_RUNNING) || (1<<MD_RECOVERY_NEEDED))) {
+ if (mddev->recovery & (1<<MD_RECOVERY_SYNC)) {
+ if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
+ type = "resync";
+ else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
+ type = "check";
+ else
+ type = "repair";
+ } else
+ type = "recover";
+ }
+ return sprintf(page, "%s\n", type);
+}
+
+static ssize_t
+md_store_scan(mddev_t *mddev, const char *page, size_t len)
+{
+ int canscan=0;
+ if (mddev->recovery &
+ ((1<<MD_RECOVERY_RUNNING) || (1<<MD_RECOVERY_NEEDED)))
+ return -EBUSY;
+ down(&mddev->reconfig_sem);
+ if (mddev->pers && mddev->pers->sync_request)
+ canscan=1;
+ up(&mddev->reconfig_sem);
+ if (!canscan)
+ return -EINVAL;
+
+ if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
+ set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+ else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
+ return -EINVAL;
+ set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
+ set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ md_wakeup_thread(mddev->thread);
+ return len;
+}
+
+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 attribute *md_default_attrs[] = {
&md_level.attr,
&md_raid_disks.attr,
+ &md_scan_mode.attr,
NULL,
};
@@ -3855,7 +3906,8 @@
is_mddev_idle(mddev); /* this also initializes IO event counters */
/* we don't use the checkpoint if there's a bitmap */
- if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap)
+ if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
+ && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
j = mddev->recovery_cp;
else
j = 0;
@@ -4093,9 +4145,13 @@
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
goto unlock;
}
- if (mddev->recovery)
- /* probably just the RECOVERY_NEEDED flag */
- mddev->recovery = 0;
+ /* Clear some bits that don't mean anything, but
+ * might be left set
+ */
+ clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+ clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
+ clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
+ clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
/* no recovery is running.
* remove any failed drives, then
@@ -4129,14 +4185,17 @@
}
}
- if (!spares && (mddev->recovery_cp == MaxSector )) {
- /* nothing we can do ... */
+ if (spares) {
+ clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+ clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
+ } else if (mddev->recovery_cp < MaxSector) {
+ set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+ } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+ /* nothing to be done ... */
goto unlock;
- }
+
if (mddev->pers->sync_request) {
set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
- if (!spares)
- set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
if (spares && mddev->bitmap && ! mddev->bitmap->file) {
/* We are adding a device or devices to an array
* which has the bitmap stored on all devices.
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index d1dad32..efd04dc 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -182,6 +182,8 @@
* ERR: and IO error was detected - abort the resync/recovery
* INTR: someone requested a (clean) early abort.
* DONE: thread is done and is waiting to be reaped
+ * REQUEST: user-space has requested a sync (used with SYNC)
+ * CHECK: user-space request for for check-only, no repair
*/
#define MD_RECOVERY_RUNNING 0
#define MD_RECOVERY_SYNC 1
@@ -189,6 +191,8 @@
#define MD_RECOVERY_INTR 3
#define MD_RECOVERY_DONE 4
#define MD_RECOVERY_NEEDED 5
+#define MD_RECOVERY_REQUESTED 6
+#define MD_RECOVERY_CHECK 7
unsigned long recovery;
int in_sync; /* know to not need resync */