From 0a3896d0f563d4472c75ab2c26afd8940d24b5a1 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 19 Apr 2013 14:37:26 -0400 Subject: [PATCH] Btrfs: fix possible infinite loop in slow caching So I noticed there is an infinite loop in the slow caching code. If we return 1 when we hit the end of the tree, so we could end up caching the last block group the slow way and suddenly we're looping forever because we just keep re-searching and trying again. Fix this by only doing btrfs_next_leaf() if we don't need_resched(). Thanks, Signed-off-by: Josef Bacik --- fs/btrfs/extent-tree.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 8464d369e478..fa57965f60a3 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -419,8 +419,7 @@ again: if (ret) break; - if (need_resched() || - btrfs_next_leaf(extent_root, path)) { + if (need_resched()) { caching_ctl->progress = last; btrfs_release_path(path); up_read(&fs_info->extent_commit_sem); @@ -428,6 +427,12 @@ again: cond_resched(); goto again; } + + ret = btrfs_next_leaf(extent_root, path); + if (ret < 0) + goto err; + if (ret) + break; leaf = path->nodes[0]; nritems = btrfs_header_nritems(leaf); continue; -- 2.20.1