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rbd: return obj version in __rbd_refresh_header()

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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>
This commit is contained in:
Alex Elder 2012-07-25 09:32:41 -05:00 committed by Sage Weil
parent ccece235d3
commit b813623ab9
1 changed files with 11 additions and 14 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);
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;