On 07/26/2012 12:09 PM, Alex Elder wrote:
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@xxxxxxxxxxx>
Reviewed-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
---
drivers/block/rbd.c | 25 +++++++++++--------------
1 file changed, 11 insertions(+), 14 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 3daf8fb..31be4ca 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)
{
@@ -1223,8 +1223,7 @@ static void rbd_watch_cb(u64 ver, u64 notify_id,
u8 opcode, void *data)
dout("rbd_watch_cb %s notify_id=%lld opcode=%d\n",
rbd_dev->header_name, notify_id, (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 "
@@ -1702,7 +1701,7 @@ 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;
@@ -1727,6 +1726,8 @@ 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;
@@ -1896,17 +1897,13 @@ 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);
@@ -2195,7 +2192,7 @@ 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;
@@ -2645,7 +2642,7 @@ 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;
--
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