From a51aa0c042fa39946dd017d5f91a073300a71577 Mon Sep 17 00:00:00 2001 From: Josh Durgin Date: Mon, 5 Dec 2011 10:35:04 -0800 Subject: [PATCH] rbd: expose the correct size of the device in sysfs If an image was mapped to a snapshot, the size of the head version would be shown. Protect capacity with header_rwsem, since it may change. Signed-off-by: Josh Durgin Reviewed-by: Alex Elder --- drivers/block/rbd.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index f171cebabda9..9c3a1db49ac4 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -1724,6 +1724,8 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev) if (ret < 0) return ret; + down_write(&rbd_dev->header_rwsem); + /* resized? */ if (rbd_dev->snap_id == CEPH_NOSNAP) { sector_t size = (sector_t) h.image_size / SECTOR_SIZE; @@ -1732,8 +1734,6 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev) set_capacity(rbd_dev->disk, size); } - down_write(&rbd_dev->header_rwsem); - snap_seq = rbd_dev->header.snapc->seq; if (rbd_dev->header.total_snaps && rbd_dev->header.snapc->snaps[0] == snap_seq) @@ -1853,8 +1853,13 @@ static ssize_t rbd_size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); + sector_t size; - return sprintf(buf, "%llu\n", (unsigned long long)rbd_dev->header.image_size); + down_read(&rbd_dev->header_rwsem); + size = get_capacity(rbd_dev->disk); + up_read(&rbd_dev->header_rwsem); + + return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); } static ssize_t rbd_major_show(struct device *dev,