btrfs: dev-replace: remove unused members of btrfs_dev_replace

Lock owner and nesting level have been unused since day 1, probably
copy&pasted from the extent_buffer locking scheme without much thinking.
The locking of device replace is simpler and does not need any lock
nesting.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 4ca6c4e..5f6ec80 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -365,8 +365,6 @@ struct btrfs_dev_replace {
        struct btrfs_device *srcdev;
        struct btrfs_device *tgtdev;
 
-       pid_t lock_owner;
-       atomic_t nesting_level;
        struct mutex lock_finishing_cancel_unmount;
        rwlock_t lock;
        atomic_t read_locks;

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3830867..c1d287a 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2154,8 +2154,6 @@ static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
 
 static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
 {
-       fs_info->dev_replace.lock_owner = 0;
-       atomic_set(&fs_info->dev_replace.nesting_level, 0);
        mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
        rwlock_init(&fs_info->dev_replace.lock);
        atomic_set(&fs_info->dev_replace.read_locks, 0);