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btrfs: move commit out of sysfs when changing label 

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba 2014-05-30 19:29:05 +02:00
parent 0eae2747ec
commit a6f69dc801
1 changed files with 8 additions and 13 deletions
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21
fs/btrfs/sysfs.c
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@ -369,9 +369,6 @@ static ssize_t btrfs_label_store(struct kobject *kobj,
const char *buf, size_t len)
{
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
struct btrfs_trans_handle *trans;
struct btrfs_root *root = fs_info->fs_root;
int ret;
size_t p_len;
if (fs_info->sb->s_flags & MS_RDONLY)
@ -386,20 +383,18 @@ static ssize_t btrfs_label_store(struct kobject *kobj,
if (p_len >= BTRFS_LABEL_SIZE)
return -EINVAL;
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans))
return PTR_ERR(trans);
spin_lock(&root->fs_info->super_lock);
spin_lock(&fs_info->super_lock);
memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
memcpy(fs_info->super_copy->label, buf, p_len);
spin_unlock(&root->fs_info->super_lock);
ret = btrfs_commit_transaction(trans, root);
spin_unlock(&fs_info->super_lock);
if (!ret)
return len;
/*
* We don't want to do full transaction commit from inside sysfs
*/
btrfs_set_pending(fs_info, COMMIT);
wake_up_process(fs_info->transaction_kthread);
return ret;
return len;
}
BTRFS_ATTR_RW(label, btrfs_label_show, btrfs_label_store);