rbd: fix a bug in resizing a mapping

[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / block / rbd.c

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 3bd12ead509199799aaa8e0124d53eb84828af8c..83265adab19c27121f347fec389260e102292a90 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3034,15 +3034,17 @@ static void rbd_remove_all_snaps(struct rbd_device *rbd_dev)
 
 static void rbd_update_mapping_size(struct rbd_device *rbd_dev)
 {
-       sector_t size;
-
        if (rbd_dev->spec->snap_id != CEPH_NOSNAP)
                return;
 
-       size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE;
-       dout("setting size to %llu sectors", (unsigned long long) size);
-       rbd_dev->mapping.size = (u64) size;
-       set_capacity(rbd_dev->disk, size);
+       if (rbd_dev->mapping.size != rbd_dev->header.image_size) {
+               sector_t size;
+
+               rbd_dev->mapping.size = rbd_dev->header.image_size;
+               size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE;
+               dout("setting size to %llu sectors", (unsigned long long)size);
+               set_capacity(rbd_dev->disk, size);
+       }
 }
 
 /*