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authorChao Yu <yuchao0@huawei.com>2018-02-03 17:44:39 +0800
committerJaegeuk Kim <jaegeuk@kernel.org>2018-03-13 08:05:40 +0900
commitfb0e72c8b94903be3a7e742ab0a4b53b89e7ee35 (patch)
treefdbc7f7837aeec1a0f453a17b2640cb41249bc4b /fs/f2fs
parent0f9ec2a8f65d72a454e99fb4f7351d7e01070385 (diff)
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f2fs: fix to handle looped node chain during recovery
There is no checksum in node block now, so bit-transition from hardware can make node_footer.next_blkaddr being corrupted w/o any detection, result in node chain becoming looped one. For this condition, during recovery, in order to avoid running into dead loop, let's detect it and just skip out. Signed-off-by: Yunlei He <heyunlei@huawei.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/recovery.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index c5e5c45130b5..1b23d3febe4c 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -242,6 +242,9 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
struct curseg_info *curseg;
struct page *page = NULL;
block_t blkaddr;
+ unsigned int loop_cnt = 0;
+ unsigned int free_blocks = sbi->user_block_count -
+ valid_user_blocks(sbi);
int err = 0;
/* get node pages in the current segment */
@@ -294,6 +297,17 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
if (IS_INODE(page) && is_dent_dnode(page))
entry->last_dentry = blkaddr;
next:
+ /* sanity check in order to detect looped node chain */
+ if (++loop_cnt >= free_blocks ||
+ blkaddr == next_blkaddr_of_node(page)) {
+ f2fs_msg(sbi->sb, KERN_NOTICE,
+ "%s: detect looped node chain, "
+ "blkaddr:%u, next:%u",
+ __func__, blkaddr, next_blkaddr_of_node(page));
+ err = -EINVAL;
+ break;
+ }
+
/* check next segment */
blkaddr = next_blkaddr_of_node(page);
f2fs_put_page(page, 1);