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authorYan Zheng <zheng.yan@oracle.com>2009-02-12 14:14:53 -0500
committerChris Mason <chris.mason@oracle.com>2009-02-12 14:14:53 -0500
commit2456242530a21cfee82646ebeeda65d3f74faa4c (patch)
treec0e8f5eda96cefeb44a48f05a248ea22b4259ad2 /fs/btrfs
parent4008c04a07c73ec3cb1be4c1391d2159a8f75d6d (diff)
downloadop-kernel-dev-2456242530a21cfee82646ebeeda65d3f74faa4c.zip
op-kernel-dev-2456242530a21cfee82646ebeeda65d3f74faa4c.tar.gz
Btrfs: hold trans_mutex when using btrfs_record_root_in_trans
btrfs_record_root_in_trans needs the trans_mutex held to make sure two callers don't race to setup the root in a given transaction. This adds it to all the places that were missing it. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/extent-tree.c2
-rw-r--r--fs/btrfs/transaction.c2
-rw-r--r--fs/btrfs/tree-log.c2
3 files changed, 6 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index cd86bff..0a5d796 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5658,7 +5658,9 @@ static noinline int relocate_one_extent(struct btrfs_root *extent_root,
prev_block = block_start;
}
+ mutex_lock(&extent_root->fs_info->trans_mutex);
btrfs_record_root_in_trans(found_root);
+ mutex_unlock(&extent_root->fs_info->trans_mutex);
if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
/*
* try to update data extent references while
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 919172de..4112d53 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -688,7 +688,9 @@ static noinline int drop_dirty_roots(struct btrfs_root *tree_root,
num_bytes -= btrfs_root_used(&dirty->root->root_item);
bytes_used = btrfs_root_used(&root->root_item);
if (num_bytes) {
+ mutex_lock(&root->fs_info->trans_mutex);
btrfs_record_root_in_trans(root);
+ mutex_unlock(&root->fs_info->trans_mutex);
btrfs_set_root_used(&root->root_item,
bytes_used - num_bytes);
}
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 2079429..9c462fb 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -2832,7 +2832,9 @@ again:
BUG_ON(!wc.replay_dest);
wc.replay_dest->log_root = log;
+ mutex_lock(&fs_info->trans_mutex);
btrfs_record_root_in_trans(wc.replay_dest);
+ mutex_unlock(&fs_info->trans_mutex);
ret = walk_log_tree(trans, log, &wc);
BUG_ON(ret);
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