f2fs: fix to avoid panic when encountering corrupt node

With fault_injection option, generic/361 of fstests will complain us
with below message:

Call Trace:
 get_node_page+0x12/0x20 [f2fs]
 f2fs_iget+0x92/0x7d0 [f2fs]
 f2fs_fill_super+0x10fb/0x15e0 [f2fs]
 mount_bdev+0x184/0x1c0
 f2fs_mount+0x15/0x20 [f2fs]
 mount_fs+0x39/0x150
 vfs_kern_mount+0x67/0x110
 do_mount+0x1bb/0xc70
 SyS_mount+0x83/0xd0
 do_syscall_64+0x6e/0x160
 entry_SYSCALL64_slow_path+0x25/0x25

Since mkfs loop device in f2fs partition can be failed silently due to
checkpoint error injection, so root inode page can be corrupted, in order
to avoid needless panic, in get_node_page, it's better to leave message
and return error to caller, and let fsck repaire it later.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 05700e54f91e7b67c824d2d0294d42cf75c815f3..f522378224aaec2ad02f07095071f788f0daa178 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1157,6 +1157,7 @@ repeat:
                f2fs_put_page(page, 1);
                return ERR_PTR(err);
        } else if (err == LOCKED_PAGE) {
+               err = 0;
                goto page_hit;
        }
 
@@ -1170,15 +1171,22 @@ repeat:
                goto repeat;
        }
 
-       if (unlikely(!PageUptodate(page)))
+       if (unlikely(!PageUptodate(page))) {
+               err = -EIO;
                goto out_err;
+       }
 page_hit:
        if(unlikely(nid != nid_of_node(page))) {
-               f2fs_bug_on(sbi, 1);
+               f2fs_msg(sbi->sb, KERN_WARNING, "inconsistent node block, "
+                       "nid:%lu, node_footer[nid:%u,ino:%u,ofs:%u,cpver:%llu,blkaddr:%u]",
+                       nid, nid_of_node(page), ino_of_node(page),
+                       ofs_of_node(page), cpver_of_node(page),
+                       next_blkaddr_of_node(page));
                ClearPageUptodate(page);
+               err = -EINVAL;
 out_err:
                f2fs_put_page(page, 1);
-               return ERR_PTR(-EIO);
+               return ERR_PTR(err);
        }
        return page;
 }