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rbd: create rbd_refresh_helper() 

Create a simple helper that handles the common case of calling
__rbd_refresh_header() while holding the ctl_mutex.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-07-25 09:32:41 -05:00 committed by Sage Weil
parent b813623ab9
commit 1fe5e99321
1 changed files with 15 additions and 10 deletions
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25
drivers/block/rbd.c
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@ -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, u64 *hver);
static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver);
static int rbd_open(struct block_device *bdev, fmode_t mode)
{
@ -1225,9 +1225,7 @@ static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n",
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);
mutex_unlock(&ctl_mutex);
rc = rbd_refresh_header(rbd_dev, &hver);
if (rc)
pr_warning(RBD_DRV_NAME "%d got notification but failed to "
" update snaps: %d\n", rbd_dev->major, rc);
@ -1751,6 +1749,17 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver)
return ret;
}
static int rbd_refresh_header(struct rbd_device *rbd_dev, u64 *hver)
{
int ret;
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
ret = __rbd_refresh_header(rbd_dev, hver);
mutex_unlock(&ctl_mutex);
return ret;
}
static int rbd_init_disk(struct rbd_device *rbd_dev)
{
struct gendisk *disk;
@ -1904,9 +1913,7 @@ static ssize_t rbd_image_refresh(struct device *dev,
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
int ret;
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
ret = __rbd_refresh_header(rbd_dev, NULL);
mutex_unlock(&ctl_mutex);
ret = rbd_refresh_header(rbd_dev, NULL);
return ret < 0 ? ret : size;
}
@ -2196,9 +2203,7 @@ static int rbd_init_watch_dev(struct rbd_device *rbd_dev)
do {
ret = rbd_req_sync_watch(rbd_dev);
if (ret == -ERANGE) {
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
rc = __rbd_refresh_header(rbd_dev, NULL);
mutex_unlock(&ctl_mutex);
rc = rbd_refresh_header(rbd_dev, NULL);
if (rc < 0)
return rc;
}