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Btrfs: fix unprotected alloc list insertion during the finishing procedure of replace

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the alloc list of the filesystem is protected by ->chunk_mutex, we need
get that mutex when we insert the new device into the list.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Miao Xie 2014-01-30 16:46:54 +08:00 committed by Josef Bacik
parent 23ad5b17dc
commit 391cd9df81
1 changed files with 3 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
fs/btrfs/dev-replace.c
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@ -484,6 +484,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
WARN_ON(ret);
/* keep away write_all_supers() during the finishing procedure */
mutex_lock(&root->fs_info->chunk_mutex);
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
btrfs_dev_replace_lock(dev_replace);
dev_replace->replace_state =
@ -503,6 +504,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
rcu_str_deref(tgt_device->name), scrub_ret);
btrfs_dev_replace_unlock(dev_replace);
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
mutex_unlock(&root->fs_info->chunk_mutex);
if (tgt_device)
btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device);
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
@ -543,6 +545,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
*/
btrfs_dev_replace_unlock(dev_replace);
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
mutex_unlock(&root->fs_info->chunk_mutex);
/* write back the superblocks */
trans = btrfs_start_transaction(root, 0);