* [PATCH v4] f2fs: avoid dead loop in function find_fsync_dnodes
@ 2017-12-15 7:56 Yunlei He
2017-12-18 12:24 ` Chao Yu
0 siblings, 1 reply; 2+ messages in thread
From: Yunlei He @ 2017-12-15 7:56 UTC (permalink / raw)
To: jaegeuk, yuchao0, linux-f2fs-devel; +Cc: ning.jia, heyunlei
Came across a dead loop in recovery like this:
......
[ 24.680480s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597696
[ 24.698394s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597697
[ 24.724334s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
[ 24.724334s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
[ 24.724365s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
[ 24.724365s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
[ 24.724365s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
[ 24.724395s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
[ 24.724395s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
[ 24.724395s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
[ 24.724395s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
[ 24.724426s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
......
Mount process will block in dead loop and fsck can do nothing with this
error, This patch abandon recovery if node chain is cyclical.
Signed-off-by: Yunlei He <heyunlei@huawei.com>
---
fs/f2fs/recovery.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 7d63faf..f7fc2ed 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -106,6 +106,14 @@ static void del_fsync_inode(struct fsync_inode_entry *entry)
kmem_cache_free(fsync_entry_slab, entry);
}
+static void destroy_fsync_dnodes(struct list_head *head)
+{
+ struct fsync_inode_entry *entry, *tmp;
+
+ list_for_each_entry_safe(entry, tmp, head, list)
+ del_fsync_inode(entry);
+}
+
static int recover_dentry(struct inode *inode, struct page *ipage,
struct list_head *dir_list)
{
@@ -239,6 +247,17 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
return 0;
page = get_tmp_page(sbi, blkaddr);
+ if (PageChecked(page)) {
+ f2fs_msg(sbi->sb, KERN_ERR, "Abandon looped node block list");
+ destroy_fsync_dnodes(head);
+ break;
+ }
+
+ /*
+ * it's not needed to clear PG_checked flag in temp page since we
+ * will truncate all those pages in the end of recovery.
+ */
+ SetPageChecked(page);
if (!is_recoverable_dnode(page))
break;
@@ -288,14 +307,6 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
return err;
}
-static void destroy_fsync_dnodes(struct list_head *head)
-{
- struct fsync_inode_entry *entry, *tmp;
-
- list_for_each_entry_safe(entry, tmp, head, list)
- del_fsync_inode(entry);
-}
-
static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
block_t blkaddr, struct dnode_of_data *dn)
{
--
1.9.1
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v4] f2fs: avoid dead loop in function find_fsync_dnodes
2017-12-15 7:56 [PATCH v4] f2fs: avoid dead loop in function find_fsync_dnodes Yunlei He
@ 2017-12-18 12:24 ` Chao Yu
0 siblings, 0 replies; 2+ messages in thread
From: Chao Yu @ 2017-12-18 12:24 UTC (permalink / raw)
To: Yunlei He, jaegeuk, linux-f2fs-devel; +Cc: ning.jia
On 2017/12/15 15:56, Yunlei He wrote:
> Came across a dead loop in recovery like this:
>
> ......
> [ 24.680480s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597696
> [ 24.698394s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597697
> [ 24.724334s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> [ 24.724334s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> [ 24.724365s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> [ 24.724365s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> [ 24.724365s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> [ 24.724395s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> [ 24.724395s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> [ 24.724395s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> [ 24.724395s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> [ 24.724426s][pid:320,cpu0,init]find_fsync_dnodes: blkaddr =13597698
> ......
>
> Mount process will block in dead loop and fsck can do nothing with this
> error, This patch abandon recovery if node chain is cyclical.
>
> Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Thanks,
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