Allow setting start point for requested check/repair

This makes it possible to just resync a small part of an array.
e.g. if a drive reports that it has questionable sectors,
a 'repair' of just the region covering those sectors will
cause them to be read and, if there is an error, re-written
with correct data.

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

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2580ac1..2613227 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -278,6 +278,7 @@ static mddev_t * mddev_find(dev_t unit)
        init_waitqueue_head(&new->sb_wait);
        init_waitqueue_head(&new->recovery_wait);
        new->reshape_position = MaxSector;
+       new->resync_min = 0;
        new->resync_max = MaxSector;
        new->level = LEVEL_NONE;
 
@@ -3075,6 +3076,36 @@ sync_completed_show(mddev_t *mddev, char *page)
 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
 
 static ssize_t
+min_sync_show(mddev_t *mddev, char *page)
+{
+       return sprintf(page, "%llu\n",
+                      (unsigned long long)mddev->resync_min);
+}
+static ssize_t
+min_sync_store(mddev_t *mddev, const char *buf, size_t len)
+{
+       unsigned long long min;
+       if (strict_strtoull(buf, 10, &min))
+               return -EINVAL;
+       if (min > mddev->resync_max)
+               return -EINVAL;
+       if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
+               return -EBUSY;
+
+       /* Must be a multiple of chunk_size */
+       if (mddev->chunk_size) {
+               if (min & (sector_t)((mddev->chunk_size>>9)-1))
+                       return -EINVAL;
+       }
+       mddev->resync_min = min;
+
+       return len;
+}
+
+static struct md_sysfs_entry md_min_sync =
+__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
+
+static ssize_t
 max_sync_show(mddev_t *mddev, char *page)
 {
        if (mddev->resync_max == MaxSector)
@@ -3089,9 +3120,10 @@ max_sync_store(mddev_t *mddev, const char *buf, size_t len)
        if (strncmp(buf, "max", 3) == 0)
                mddev->resync_max = MaxSector;
        else {
-               char *ep;
-               unsigned long long max = simple_strtoull(buf, &ep, 10);
-               if (ep == buf || (*ep != 0 && *ep != '\n'))
+               unsigned long long max;
+               if (strict_strtoull(buf, 10, &max))
+                       return -EINVAL;
+               if (max < mddev->resync_min)
                        return -EINVAL;
                if (max < mddev->resync_max &&
                    test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
@@ -3222,6 +3254,7 @@ static struct attribute *md_redundancy_attrs[] = {
        &md_sync_speed.attr,
        &md_sync_force_parallel.attr,
        &md_sync_completed.attr,
+       &md_min_sync.attr,
        &md_max_sync.attr,
        &md_suspend_lo.attr,
        &md_suspend_hi.attr,
@@ -3777,6 +3810,7 @@ static int do_md_stop(mddev_t * mddev, int mode)
                mddev->size = 0;
                mddev->raid_disks = 0;
                mddev->recovery_cp = 0;
+               mddev->resync_min = 0;
                mddev->resync_max = MaxSector;
                mddev->reshape_position = MaxSector;
                mddev->external = 0;
@@ -5625,9 +5659,11 @@ void md_do_sync(mddev_t *mddev)
                max_sectors = mddev->resync_max_sectors;
                mddev->resync_mismatches = 0;
                /* we don't use the checkpoint if there's a bitmap */
-               if (!mddev->bitmap &&
-                   !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
+               if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
+                       j = mddev->resync_min;
+               else if (!mddev->bitmap)
                        j = mddev->recovery_cp;
+
        } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
                max_sectors = mddev->size << 1;
        else {
@@ -5796,6 +5832,7 @@ void md_do_sync(mddev_t *mddev)
 
  skip:
        mddev->curr_resync = 0;
+       mddev->resync_min = 0;
        mddev->resync_max = MaxSector;
        sysfs_notify(&mddev->kobj, NULL, "sync_completed");
        wake_up(&resync_wait);

diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 3dea9f5..780e061 100644 (file)
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -227,6 +227,8 @@ struct mddev_s
        atomic_t                        recovery_active; /* blocks scheduled, but not written */
        wait_queue_head_t               recovery_wait;
        sector_t                        recovery_cp;
+       sector_t                        resync_min;     /* user requested sync
+                                                        * starts here */
        sector_t                        resync_max;     /* resync should pause
                                                         * when it gets here */