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Btrfs: free btrfs_device in place

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It's pointless to defer it to a kthread helper as we're not under a
special context.

For reference, commit 1f78160ce1 ("Btrfs: using rcu lock in the reader
side of devices list") introduced RCU freeing for device structures.

Originally the blkdev_put was called from free_device and rcu_barrier had
to be called. This is no longer required, bdev and our device structures
are now freed separately.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ enhance changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-10-23 23:02:54 -06:00 committed by David Sterba
parent 1805f2ca3f
commit 9f5316c17b
2 changed files with 3 additions and 14 deletions
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16
fs/btrfs/volumes.c
View File

@ -824,24 +824,14 @@ void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices, int step)
mutex_unlock(&uuid_mutex);
}
static void __free_device(struct work_struct *work)
{
struct btrfs_device *device;
device = container_of(work, struct btrfs_device, rcu_work);
rcu_string_free(device->name);
bio_put(device->flush_bio);
kfree(device);
}
static void free_device(struct rcu_head *head)
{
struct btrfs_device *device;
device = container_of(head, struct btrfs_device, rcu);
INIT_WORK(&device->rcu_work, __free_device);
schedule_work(&device->rcu_work);
rcu_string_free(device->name);
bio_put(device->flush_bio);
kfree(device);
}
static void btrfs_close_bdev(struct btrfs_device *device)

1
fs/btrfs/volumes.h
View File

@ -133,7 +133,6 @@ struct btrfs_device {
struct btrfs_work work;
struct rcu_head rcu;
struct work_struct rcu_work;
/* readahead state */
spinlock_t reada_lock;