[PATCH] f2fs: fix a infinite loop in writting checkpoint

[Yunlei He <heyunlei@huawei.com>]

The loop reason is DIRTY IMETA always equal to 1:

Thread A:
-write_checkpoint
   -block_operations
       -f2fs_sync_inode_meta
           -igrab       <--- here igrab return NULL

Thread B:
-f2fs_evict_inode
   -remove_inode_page
       -truncate_xattr_node
          -__get_node_page
             -read_node_page   <---- here return -ENOENT

This patch walk around this cause.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
---
 fs/f2fs/node.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 2654c91..ec7a0e0 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -973,8 +973,9 @@ int truncate_xattr_node(struct inode *inode, struct page *page)
 		return 0;
 
 	npage = get_node_page(sbi, nid);
-	if (IS_ERR(npage))
+	if (IS_ERR(npage) && PTR_ERR(npage) != -ENOENT) {
 		return PTR_ERR(npage);
+	}
 
 	f2fs_i_xnid_write(inode, 0);
 
-- 
1.9.1


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