From 00a653e216a8427547774ab3f2cc92709c3e28c9 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 6 May 2013 07:40:30 -0500 Subject: [PATCH] rbd: update capacity in rbd_dev_refresh() When a mapped image changes size, we change the capacity recorded for the Linux disk associated with it, in rbd_update_mapping_size(). That function is called in two places--the format 1 and format 2 refresh routines. There is no need to set the capacity while holding the header semaphore. Instead, do it in the common rbd_dev_refresh(), using the logic that's already there to initiate disk revalidation. Add handling in the request function, just in case a request that exceeds the capacity of the device comes in (perhaps one that was started before a refresh shrunk the device). Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 5d5e3f0b5fb4..9c094c67d778 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -2874,6 +2874,13 @@ static void rbd_request_fn(struct request_queue *q) goto end_request; /* Shouldn't happen */ } + result = -EIO; + if (offset + length > rbd_dev->mapping.size) { + rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)\n", + offset, length, rbd_dev->mapping.size); + goto end_request; + } + result = -ENOMEM; img_request = rbd_img_request_create(rbd_dev, offset, length, write_request, false); @@ -3116,14 +3123,8 @@ static void rbd_update_mapping_size(struct rbd_device *rbd_dev) if (rbd_dev->spec->snap_id != CEPH_NOSNAP) return; - if (rbd_dev->mapping.size != rbd_dev->header.image_size) { - sector_t size; - + if (rbd_dev->mapping.size != rbd_dev->header.image_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); - } } /* @@ -3200,8 +3201,14 @@ static int rbd_dev_refresh(struct rbd_device *rbd_dev) rbd_exists_validate(rbd_dev); mutex_unlock(&ctl_mutex); - if (mapping_size != rbd_dev->mapping.size) + if (mapping_size != rbd_dev->mapping.size) { + sector_t 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); revalidate_disk(rbd_dev->disk); + } return ret; } -- 2.39.5