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rbd: define rbd_dev_{create,destroy}() helpers 

Encapsulate the creation/initialization and destruction of rbd
device structures.  The rbd_client and the rbd_spec structures
provided on creation hold references whose ownership is transferred
to the new rbd_device structure.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-10-25 23:34:42 -05:00
parent bd4ba6554d
commit c53d589337
1 changed files with 41 additions and 21 deletions
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62
drivers/block/rbd.c
View File

@ -504,7 +504,8 @@ static void rbd_client_release(struct kref *kref)
*/
static void rbd_put_client(struct rbd_client *rbdc)
{
kref_put(&rbdc->kref, rbd_client_release);
if (rbdc)
kref_put(&rbdc->kref, rbd_client_release);
}
/*
@ -2166,6 +2167,34 @@ static void rbd_spec_free(struct kref *kref)
kfree(spec);
}
struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
struct rbd_spec *spec)
{
struct rbd_device *rbd_dev;
rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL);
if (!rbd_dev)
return NULL;
spin_lock_init(&rbd_dev->lock);
INIT_LIST_HEAD(&rbd_dev->node);
INIT_LIST_HEAD(&rbd_dev->snaps);
init_rwsem(&rbd_dev->header_rwsem);
rbd_dev->spec = spec;
rbd_dev->rbd_client = rbdc;
return rbd_dev;
}
static void rbd_dev_destroy(struct rbd_device *rbd_dev)
{
kfree(rbd_dev->header_name);
rbd_put_client(rbd_dev->rbd_client);
rbd_spec_put(rbd_dev->spec);
kfree(rbd_dev);
}
static bool rbd_snap_registered(struct rbd_snap *snap)
{
bool ret = snap->dev.type == &rbd_snap_device_type;
@ -3242,7 +3271,7 @@ static ssize_t rbd_add(struct bus_type *bus,
rc = PTR_ERR(rbdc);
goto err_out_args;
}
ceph_opts = NULL; /* ceph_opts now owned by rbd_dev client */
ceph_opts = NULL; /* rbd_dev client now owns this */
/* pick the pool */
osdc = &rbdc->client->osdc;
@ -3251,22 +3280,19 @@ static ssize_t rbd_add(struct bus_type *bus,
goto err_out_client;
spec->pool_id = (u64) rc;
rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL);
rbd_dev = rbd_dev_create(rbdc, spec);
if (!rbd_dev)
goto err_out_client;
spin_lock_init(&rbd_dev->lock);
INIT_LIST_HEAD(&rbd_dev->node);
INIT_LIST_HEAD(&rbd_dev->snaps);
init_rwsem(&rbd_dev->header_rwsem);
rbd_dev->rbd_client = rbdc;
rbd_dev->spec = spec;
rbdc = NULL; /* rbd_dev now owns this */
spec = NULL; /* rbd_dev now owns this */
rbd_dev->mapping.read_only = rbd_opts->read_only;
kfree(rbd_opts);
rbd_opts = NULL; /* done with this */
rc = rbd_dev_probe(rbd_dev);
if (rc < 0)
goto err_out_mem;
goto err_out_rbd_dev;
/* no need to lock here, as rbd_dev is not registered yet */
rc = rbd_dev_snaps_update(rbd_dev);
@ -3317,8 +3343,6 @@ static ssize_t rbd_add(struct bus_type *bus,
if (rc)
goto err_out_bus;
kfree(rbd_opts);
/* Everything's ready. Announce the disk to the world. */
add_disk(rbd_dev->disk);
@ -3332,7 +3356,6 @@ err_out_bus:
/* this will also clean up rest of rbd_dev stuff */
rbd_bus_del_dev(rbd_dev);
kfree(rbd_opts);
return rc;
@ -3346,9 +3369,8 @@ err_out_snaps:
rbd_remove_all_snaps(rbd_dev);
err_out_probe:
rbd_header_free(&rbd_dev->header);
kfree(rbd_dev->header_name);
err_out_mem:
kfree(rbd_dev);
err_out_rbd_dev:
rbd_dev_destroy(rbd_dev);
err_out_client:
rbd_put_client(rbdc);
err_out_args:
@ -3394,7 +3416,6 @@ static void rbd_dev_release(struct device *dev)
if (rbd_dev->watch_event)
rbd_req_sync_unwatch(rbd_dev);
rbd_put_client(rbd_dev->rbd_client);
/* clean up and free blkdev */
rbd_free_disk(rbd_dev);
@ -3404,10 +3425,9 @@ static void rbd_dev_release(struct device *dev)
rbd_header_free(&rbd_dev->header);
/* done with the id, and with the rbd_dev */
kfree(rbd_dev->header_name);
rbd_dev_id_put(rbd_dev);
rbd_spec_put(rbd_dev->spec);
kfree(rbd_dev);
rbd_assert(rbd_dev->rbd_client != NULL);
rbd_dev_destroy(rbd_dev);
/* release module ref */
module_put(THIS_MODULE);