Wang Shilong
2014-Feb-19 11:24 UTC
[PATCH 1/4] 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>
---
fs/btrfs/transaction.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
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 @@ static void cleanup_transaction(struct btrfs_trans_handle
*trans,
trace_btrfs_transaction_commit(root);
- btrfs_scrub_continue(root);
-
if (current->journal_info == trans)
current->journal_info = NULL;
@@ -1754,7 +1752,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle
*trans,
/* ->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 @@ int btrfs_commit_transaction(struct btrfs_trans_handle
*trans,
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 @@ int btrfs_commit_transaction(struct btrfs_trans_handle
*trans,
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 @@ int btrfs_commit_transaction(struct btrfs_trans_handle
*trans,
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 @@ int btrfs_commit_transaction(struct btrfs_trans_handle
*trans,
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 @@ int btrfs_commit_transaction(struct btrfs_trans_handle
*trans,
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 @@ int btrfs_commit_transaction(struct btrfs_trans_handle
*trans,
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 @@ int btrfs_commit_transaction(struct btrfs_trans_handle
*trans,
return ret;
+scrub_continue:
+ btrfs_scrub_continue(root);
cleanup_transaction:
btrfs_trans_release_metadata(trans, root);
trans->block_rsv = NULL;
--
1.8.3.1
--
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