md: Use revalidate_disk to effect changes in size of device.

As revalidate_disk calls check_disk_size_change, it will cause
any capacity change of a gendisk to be propagated to the blockdev
inode.  So use that instead of mucking about with locks and
i_size_write.

Also add a call to revalidate_disk in do_md_run and a few other places
where the gendisk capacity is changed.

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

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 54c8677..5fe39c2 100644 (file)
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -257,6 +257,7 @@ static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev)
        rcu_assign_pointer(mddev->private, newconf);
        md_set_array_sectors(mddev, linear_size(mddev, 0, 0));
        set_capacity(mddev->gendisk, mddev->array_sectors);
+       revalidate_disk(mddev->gendisk);
        call_rcu(&oldconf->rcu, free_conf);
        return 0;
 }

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 52c988b..5b98bea 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3741,17 +3741,8 @@ array_size_store(mddev_t *mddev, const char *buf, size_t len)
 
        mddev->array_sectors = sectors;
        set_capacity(mddev->gendisk, mddev->array_sectors);
-       if (mddev->pers) {
-               struct block_device *bdev = bdget_disk(mddev->gendisk, 0);
-
-               if (bdev) {
-                       mutex_lock(&bdev->bd_inode->i_mutex);
-                       i_size_write(bdev->bd_inode,
-                                    (loff_t)mddev->array_sectors << 9);
-                       mutex_unlock(&bdev->bd_inode->i_mutex);
-                       bdput(bdev);
-               }
-       }
+       if (mddev->pers)
+               revalidate_disk(mddev->gendisk);
 
        return len;
 }
@@ -4241,6 +4232,7 @@ static int do_md_run(mddev_t * mddev)
        md_wakeup_thread(mddev->thread);
        md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
 
+       revalidate_disk(mddev->gendisk);
        mddev->changed = 1;
        md_new_event(mddev);
        sysfs_notify_dirent(mddev->sysfs_state);
@@ -5139,18 +5131,8 @@ static int update_size(mddev_t *mddev, sector_t num_sectors)
                        return -ENOSPC;
        }
        rv = mddev->pers->resize(mddev, num_sectors);
-       if (!rv) {
-               struct block_device *bdev;
-
-               bdev = bdget_disk(mddev->gendisk, 0);
-               if (bdev) {
-                       mutex_lock(&bdev->bd_inode->i_mutex);
-                       i_size_write(bdev->bd_inode,
-                                    (loff_t)mddev->array_sectors << 9);
-                       mutex_unlock(&bdev->bd_inode->i_mutex);
-                       bdput(bdev);
-               }
-       }
+       if (!rv)
+               revalidate_disk(mddev->gendisk);
        return rv;
 }
 

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 67e794d..8726fd7 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2134,6 +2134,7 @@ static int raid1_resize(mddev_t *mddev, sector_t sectors)
                return -EINVAL;
        set_capacity(mddev->gendisk, mddev->array_sectors);
        mddev->changed = 1;
+       revalidate_disk(mddev->gendisk);
        if (sectors > mddev->dev_sectors &&
            mddev->recovery_cp == MaxSector) {
                mddev->recovery_cp = mddev->dev_sectors;

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 2dc35b4..2b521ee 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4858,6 +4858,7 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
                return -EINVAL;
        set_capacity(mddev->gendisk, mddev->array_sectors);
        mddev->changed = 1;
+       revalidate_disk(mddev->gendisk);
        if (sectors > mddev->dev_sectors && mddev->recovery_cp == MaxSector) {
                mddev->recovery_cp = mddev->dev_sectors;
                set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
@@ -5058,7 +5059,6 @@ static void end_reshape(raid5_conf_t *conf)
  */
 static void raid5_finish_reshape(mddev_t *mddev)
 {
-       struct block_device *bdev;
        raid5_conf_t *conf = mddev->private;
 
        if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
@@ -5067,15 +5067,7 @@ static void raid5_finish_reshape(mddev_t *mddev)
                        md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
                        set_capacity(mddev->gendisk, mddev->array_sectors);
                        mddev->changed = 1;
-
-                       bdev = bdget_disk(mddev->gendisk, 0);
-                       if (bdev) {
-                               mutex_lock(&bdev->bd_inode->i_mutex);
-                               i_size_write(bdev->bd_inode,
-                                            (loff_t)mddev->array_sectors << 9);
-                               mutex_unlock(&bdev->bd_inode->i_mutex);
-                               bdput(bdev);
-                       }
+                       revalidate_disk(mddev->gendisk);
                } else {
                        int d;
                        mddev->degraded = conf->raid_disks;