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btrfs: introduce free_device helper

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A helper to free a device and all it's dynamically allocated members,
like the rcu_string name or flush_bio. This is going to replace all
open coded places.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-10-30 18:10:25 +01:00
parent f06c5965ab
commit 48dae9cf3f
1 changed files with 14 additions and 2 deletions
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16
fs/btrfs/volumes.c
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@ -180,6 +180,13 @@ static struct btrfs_fs_devices *alloc_fs_devices(const u8 *fsid)
return fs_devs; return fs_devs;
} }
static void free_device(struct btrfs_device *device)
{
rcu_string_free(device->name);
bio_put(device->flush_bio);
kfree(device);
}
static void free_fs_devices(struct btrfs_fs_devices *fs_devices) static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
{ {
struct btrfs_device *device; struct btrfs_device *device;
@ -220,6 +227,11 @@ void btrfs_cleanup_fs_uuids(void)
} }
} }
/*
* Returns a pointer to a new btrfs_device on success; ERR_PTR() on error.
* Returned struct is not linked onto any lists and must be destroyed using
* free_device.
*/
static struct btrfs_device *__alloc_device(void) static struct btrfs_device *__alloc_device(void)
{ {
struct btrfs_device *dev; struct btrfs_device *dev;
@ -6257,8 +6269,8 @@ static struct btrfs_device *add_missing_dev(struct btrfs_fs_devices *fs_devices,
* is generated. * is generated.
* *
* Return: a pointer to a new &struct btrfs_device on success; ERR_PTR() * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR()
* on error. Returned struct is not linked onto any lists and can be * on error. Returned struct is not linked onto any lists and must be
* destroyed with kfree() right away. * destroyed with free_device.
*/ */
struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
const u64 *devid, const u64 *devid,