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rbd: encapsulate new rbd id selection

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Move the loop that finds a new unique rbd id to use into
its own helper function.

Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Alex Elder 2012-01-29 13:57:43 -06:00
parent cc9d734c3d
commit b7f23c361b
1 changed files with 19 additions and 11 deletions
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30
drivers/block/rbd.c
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@ -2149,6 +2149,23 @@ static int rbd_init_watch_dev(struct rbd_device *rbd_dev)
return ret;
}
/* caller must hold ctl_mutex */
static int rbd_id_get(void)
{
struct list_head *tmp;
int new_id = 0;
list_for_each(tmp, &rbd_dev_list) {
struct rbd_device *rbd_dev;
rbd_dev = list_entry(tmp, struct rbd_device, node);
if (rbd_dev->id >= new_id)
new_id = rbd_dev->id + 1;
}
return new_id;
}
static ssize_t rbd_add(struct bus_type *bus,
const char *buf,
size_t count)
@ -2156,8 +2173,7 @@ static ssize_t rbd_add(struct bus_type *bus,
struct ceph_osd_client *osdc;
struct rbd_device *rbd_dev;
ssize_t rc = -ENOMEM;
int irc, new_id = 0;
struct list_head *tmp;
int irc;
char *mon_dev_name;
char *options;
@ -2187,15 +2203,7 @@ static ssize_t rbd_add(struct bus_type *bus,
/* generate unique id: find highest unique id, add one */
mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
list_for_each(tmp, &rbd_dev_list) {
struct rbd_device *rbd_dev;
rbd_dev = list_entry(tmp, struct rbd_device, node);
if (rbd_dev->id >= new_id)
new_id = rbd_dev->id + 1;
}
rbd_dev->id = new_id;
rbd_dev->id = rbd_id_get();
/* add to global list */
list_add_tail(&rbd_dev->node, &rbd_dev_list);