Btrfs: fix a possible deadlock between scrub and transaction committing
btrfs_scrub_continue() will be called when cleaning up transaction.However,
this can only be called if btrfs_scrub_pause() is called before.
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 34cd831..84da666 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1578,8 +1578,6 @@
trace_btrfs_transaction_commit(root);
- btrfs_scrub_continue(root);
-
if (current->journal_info == trans)
current->journal_info = NULL;
@@ -1754,7 +1752,7 @@
/* ->aborted might be set after the previous check, so check it */
if (unlikely(ACCESS_ONCE(cur_trans->aborted))) {
ret = cur_trans->aborted;
- goto cleanup_transaction;
+ goto scrub_continue;
}
/*
* the reloc mutex makes sure that we stop
@@ -1771,7 +1769,7 @@
ret = create_pending_snapshots(trans, root->fs_info);
if (ret) {
mutex_unlock(&root->fs_info->reloc_mutex);
- goto cleanup_transaction;
+ goto scrub_continue;
}
/*
@@ -1787,13 +1785,13 @@
ret = btrfs_run_delayed_items(trans, root);
if (ret) {
mutex_unlock(&root->fs_info->reloc_mutex);
- goto cleanup_transaction;
+ goto scrub_continue;
}
ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
if (ret) {
mutex_unlock(&root->fs_info->reloc_mutex);
- goto cleanup_transaction;
+ goto scrub_continue;
}
/*
@@ -1823,7 +1821,7 @@
if (ret) {
mutex_unlock(&root->fs_info->tree_log_mutex);
mutex_unlock(&root->fs_info->reloc_mutex);
- goto cleanup_transaction;
+ goto scrub_continue;
}
/*
@@ -1844,7 +1842,7 @@
if (ret) {
mutex_unlock(&root->fs_info->tree_log_mutex);
mutex_unlock(&root->fs_info->reloc_mutex);
- goto cleanup_transaction;
+ goto scrub_continue;
}
/*
@@ -1855,7 +1853,7 @@
ret = cur_trans->aborted;
mutex_unlock(&root->fs_info->tree_log_mutex);
mutex_unlock(&root->fs_info->reloc_mutex);
- goto cleanup_transaction;
+ goto scrub_continue;
}
btrfs_prepare_extent_commit(trans, root);
@@ -1891,13 +1889,13 @@
btrfs_error(root->fs_info, ret,
"Error while writing out transaction");
mutex_unlock(&root->fs_info->tree_log_mutex);
- goto cleanup_transaction;
+ goto scrub_continue;
}
ret = write_ctree_super(trans, root, 0);
if (ret) {
mutex_unlock(&root->fs_info->tree_log_mutex);
- goto cleanup_transaction;
+ goto scrub_continue;
}
/*
@@ -1940,6 +1938,8 @@
return ret;
+scrub_continue:
+ btrfs_scrub_continue(root);
cleanup_transaction:
btrfs_trans_release_metadata(trans, root);
trans->block_rsv = NULL;