diff options
| author | Alex Elder <elder@inktank.com> | 2012-07-25 09:32:41 -0500 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2012-07-30 18:21:46 -0700 |
| commit | b813623ab95d0b4bbeb22e160bd5461965d0c571 (patch) | |
| tree | a40f3cc64c62b7ab643167a72c2789b7561b06b8 | |
| parent | ccece235d3737221e7a1118fdbd8474112adac84 (diff) | |
rbd: return obj version in __rbd_refresh_header()
Add a new parameter to __rbd_refresh_header() through which the
version of the header object is passed back to the caller. In most
cases this isn't needed. The main motivation is to normalize
(almost) all calls to __rbd_refresh_header() so they are all
wrapped immediately by mutex_lock()/mutex_unlock().
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
| -rw-r--r-- | drivers/block/rbd.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 34676937d2d..de981ac7236 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -240,7 +240,7 @@ static void rbd_put_dev(struct rbd_device *rbd_dev) put_device(&rbd_dev->dev); } -static int __rbd_refresh_header(struct rbd_device *rbd_dev); +static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver); static int rbd_open(struct block_device *bdev, fmode_t mode) { @@ -1226,8 +1226,7 @@ static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) rbd_dev->header_name, (unsigned long long) notify_id, (unsigned int) opcode); mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); - rc = __rbd_refresh_header(rbd_dev); - hver = rbd_dev->header.obj_version; + rc = __rbd_refresh_header(rbd_dev, &hver); mutex_unlock(&ctl_mutex); if (rc) pr_warning(RBD_DRV_NAME "%d got notification but failed to " @@ -1707,7 +1706,7 @@ static void __rbd_remove_all_snaps(struct rbd_device *rbd_dev) /* * only read the first part of the ondisk header, without the snaps info */ -static int __rbd_refresh_header(struct rbd_device *rbd_dev) +static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver) { int ret; struct rbd_image_header h; @@ -1732,6 +1731,8 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev) /* osd requests may still refer to snapc */ ceph_put_snap_context(rbd_dev->header.snapc); + if (hver) + *hver = h.obj_version; rbd_dev->header.obj_version = h.obj_version; rbd_dev->header.image_size = h.image_size; rbd_dev->header.total_snaps = h.total_snaps; @@ -1901,17 +1902,13 @@ static ssize_t rbd_image_refresh(struct device *dev, size_t size) { struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); - int rc; - int ret = size; + int ret; mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); - - rc = __rbd_refresh_header(rbd_dev); - if (rc < 0) - ret = rc; - + ret = __rbd_refresh_header(rbd_dev, NULL); mutex_unlock(&ctl_mutex); - return ret; + + return ret < 0 ? ret : size; } static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); @@ -2200,7 +2197,7 @@ static int rbd_init_watch_dev(struct rbd_device *rbd_dev) ret = rbd_req_sync_watch(rbd_dev); if (ret == -ERANGE) { mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); - rc = __rbd_refresh_header(rbd_dev); + rc = __rbd_refresh_header(rbd_dev, NULL); mutex_unlock(&ctl_mutex); if (rc < 0) return rc; @@ -2650,7 +2647,7 @@ static ssize_t rbd_snap_add(struct device *dev, if (ret < 0) goto err_unlock; - ret = __rbd_refresh_header(rbd_dev); + ret = __rbd_refresh_header(rbd_dev, NULL); if (ret < 0) goto err_unlock; |