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path: root/drivers/block/rbd.c
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Diffstat (limited to 'drivers/block/rbd.c')
-rw-r--r--drivers/block/rbd.c109
1 files changed, 54 insertions, 55 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 8630a77ea..81ea69fee 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -418,8 +418,6 @@ MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (d
static int rbd_img_request_submit(struct rbd_img_request *img_request);
-static void rbd_dev_device_release(struct device *dev);
-
static ssize_t rbd_add(struct bus_type *bus, const char *buf,
size_t count);
static ssize_t rbd_remove(struct bus_type *bus, const char *buf,
@@ -3992,14 +3990,12 @@ static const struct attribute_group *rbd_attr_groups[] = {
NULL
};
-static void rbd_sysfs_dev_release(struct device *dev)
-{
-}
+static void rbd_dev_release(struct device *dev);
static struct device_type rbd_device_type = {
.name = "rbd",
.groups = rbd_attr_groups,
- .release = rbd_sysfs_dev_release,
+ .release = rbd_dev_release,
};
static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec)
@@ -4042,6 +4038,25 @@ static void rbd_spec_free(struct kref *kref)
kfree(spec);
}
+static void rbd_dev_release(struct device *dev)
+{
+ struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
+ bool need_put = !!rbd_dev->opts;
+
+ rbd_put_client(rbd_dev->rbd_client);
+ rbd_spec_put(rbd_dev->spec);
+ kfree(rbd_dev->opts);
+ kfree(rbd_dev);
+
+ /*
+ * This is racy, but way better than putting module outside of
+ * the release callback. The race window is pretty small, so
+ * doing something similar to dm (dm-builtin.c) is overkill.
+ */
+ if (need_put)
+ module_put(THIS_MODULE);
+}
+
static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
struct rbd_spec *spec,
struct rbd_options *opts)
@@ -4058,6 +4073,11 @@ static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
INIT_LIST_HEAD(&rbd_dev->node);
init_rwsem(&rbd_dev->header_rwsem);
+ rbd_dev->dev.bus = &rbd_bus_type;
+ rbd_dev->dev.type = &rbd_device_type;
+ rbd_dev->dev.parent = &rbd_root_dev;
+ device_initialize(&rbd_dev->dev);
+
rbd_dev->rbd_client = rbdc;
rbd_dev->spec = spec;
rbd_dev->opts = opts;
@@ -4069,15 +4089,21 @@ static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id);
+ /*
+ * If this is a mapping rbd_dev (as opposed to a parent one),
+ * pin our module. We have a ref from do_rbd_add(), so use
+ * __module_get().
+ */
+ if (rbd_dev->opts)
+ __module_get(THIS_MODULE);
+
return rbd_dev;
}
static void rbd_dev_destroy(struct rbd_device *rbd_dev)
{
- rbd_put_client(rbd_dev->rbd_client);
- rbd_spec_put(rbd_dev->spec);
- kfree(rbd_dev->opts);
- kfree(rbd_dev);
+ if (rbd_dev)
+ put_device(&rbd_dev->dev);
}
/*
@@ -4703,27 +4729,6 @@ static int rbd_dev_header_info(struct rbd_device *rbd_dev)
return rbd_dev_v2_header_info(rbd_dev);
}
-static int rbd_bus_add_dev(struct rbd_device *rbd_dev)
-{
- struct device *dev;
- int ret;
-
- dev = &rbd_dev->dev;
- dev->bus = &rbd_bus_type;
- dev->type = &rbd_device_type;
- dev->parent = &rbd_root_dev;
- dev->release = rbd_dev_device_release;
- dev_set_name(dev, "%d", rbd_dev->dev_id);
- ret = device_register(dev);
-
- return ret;
-}
-
-static void rbd_bus_del_dev(struct rbd_device *rbd_dev)
-{
- device_unregister(&rbd_dev->dev);
-}
-
/*
* Get a unique rbd identifier for the given new rbd_dev, and add
* the rbd_dev to the global list.
@@ -5226,7 +5231,8 @@ static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only);
- ret = rbd_bus_add_dev(rbd_dev);
+ dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id);
+ ret = device_add(&rbd_dev->dev);
if (ret)
goto err_out_mapping;
@@ -5249,8 +5255,6 @@ err_out_blkdev:
unregister_blkdev(rbd_dev->major, rbd_dev->name);
err_out_id:
rbd_dev_id_put(rbd_dev);
- rbd_dev_mapping_clear(rbd_dev);
-
return ret;
}
@@ -5398,7 +5402,7 @@ static ssize_t do_rbd_add(struct bus_type *bus,
struct rbd_spec *spec = NULL;
struct rbd_client *rbdc;
bool read_only;
- int rc = -ENOMEM;
+ int rc;
if (!try_module_get(THIS_MODULE))
return -ENODEV;
@@ -5406,7 +5410,7 @@ static ssize_t do_rbd_add(struct bus_type *bus,
/* parse add command */
rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec);
if (rc < 0)
- goto err_out_module;
+ goto out;
rbdc = rbd_get_client(ceph_opts);
if (IS_ERR(rbdc)) {
@@ -5433,8 +5437,10 @@ static ssize_t do_rbd_add(struct bus_type *bus,
}
rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts);
- if (!rbd_dev)
+ if (!rbd_dev) {
+ rc = -ENOMEM;
goto err_out_client;
+ }
rbdc = NULL; /* rbd_dev now owns this */
spec = NULL; /* rbd_dev now owns this */
rbd_opts = NULL; /* rbd_dev now owns this */
@@ -5459,10 +5465,13 @@ static ssize_t do_rbd_add(struct bus_type *bus,
*/
rbd_dev_header_unwatch_sync(rbd_dev);
rbd_dev_image_release(rbd_dev);
- goto err_out_module;
+ goto out;
}
- return count;
+ rc = count;
+out:
+ module_put(THIS_MODULE);
+ return rc;
err_out_rbd_dev:
rbd_dev_destroy(rbd_dev);
@@ -5471,12 +5480,7 @@ err_out_client:
err_out_args:
rbd_spec_put(spec);
kfree(rbd_opts);
-err_out_module:
- module_put(THIS_MODULE);
-
- dout("Error adding device %s\n", buf);
-
- return (ssize_t)rc;
+ goto out;
}
static ssize_t rbd_add(struct bus_type *bus,
@@ -5496,17 +5500,15 @@ static ssize_t rbd_add_single_major(struct bus_type *bus,
return do_rbd_add(bus, buf, count);
}
-static void rbd_dev_device_release(struct device *dev)
+static void rbd_dev_device_release(struct rbd_device *rbd_dev)
{
- struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
-
rbd_free_disk(rbd_dev);
clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
+ device_del(&rbd_dev->dev);
rbd_dev_mapping_clear(rbd_dev);
if (!single_major)
unregister_blkdev(rbd_dev->major, rbd_dev->name);
rbd_dev_id_put(rbd_dev);
- rbd_dev_mapping_clear(rbd_dev);
}
static void rbd_dev_remove_parent(struct rbd_device *rbd_dev)
@@ -5591,9 +5593,8 @@ static ssize_t do_rbd_remove(struct bus_type *bus,
* rbd_bus_del_dev() will race with rbd_watch_cb(), resulting
* in a potential use after free of rbd_dev->disk or rbd_dev.
*/
- rbd_bus_del_dev(rbd_dev);
+ rbd_dev_device_release(rbd_dev);
rbd_dev_image_release(rbd_dev);
- module_put(THIS_MODULE);
return count;
}
@@ -5664,10 +5665,8 @@ static int rbd_slab_init(void)
if (rbd_segment_name_cache)
return 0;
out_err:
- if (rbd_obj_request_cache) {
- kmem_cache_destroy(rbd_obj_request_cache);
- rbd_obj_request_cache = NULL;
- }
+ kmem_cache_destroy(rbd_obj_request_cache);
+ rbd_obj_request_cache = NULL;
kmem_cache_destroy(rbd_img_request_cache);
rbd_img_request_cache = NULL;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-04 10:58:11 +0000