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path: root/fs/btrfs/qgroup.c
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Diffstat (limited to 'fs/btrfs/qgroup.c')
-rw-r--r--fs/btrfs/qgroup.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index b53d2e7b938d..2272419ade7e 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1013,16 +1013,22 @@ out_add_root:
btrfs_abort_transaction(trans, ret);
goto out_free_path;
}
- spin_lock(&fs_info->qgroup_lock);
- fs_info->quota_root = quota_root;
- set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
- spin_unlock(&fs_info->qgroup_lock);
ret = btrfs_commit_transaction(trans);
trans = NULL;
if (ret)
goto out_free_path;
+ /*
+ * Set quota enabled flag after committing the transaction, to avoid
+ * deadlocks on fs_info->qgroup_ioctl_lock with concurrent snapshot
+ * creation.
+ */
+ spin_lock(&fs_info->qgroup_lock);
+ fs_info->quota_root = quota_root;
+ set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
+ spin_unlock(&fs_info->qgroup_lock);
+
ret = qgroup_rescan_init(fs_info, 0, 1);
if (!ret) {
qgroup_rescan_zero_tracking(fs_info);