From 8f9d8d38f2c4cea10d82d62286e6caa837d1bfd6 Mon Sep 17 00:00:00 2001
From: hexiaole <hexiaole@kylinos.cn>
Date: Wed, 13 Jul 2022 20:58:24 -0500
Subject: [PATCH] xfs: correct nlink printf specifier from hd to PRIu32

1. Description
libxfs/xfs_log_format.h declare 'di_nlink' as unsigned 32-bit integer:

typedef struct xfs_icdinode {
        ...
        __uint32_t      di_nlink;       /* number of links to file */
        ...
} xfs_icdinode_t;

But logprint/log_misc.c use '%hd' to print 'di_nlink':

void
xlog_print_trans_inode_core(xfs_icdinode_t *ip)
{
    ...
    printf(_("nlink %hd uid %d gid %d\n"),
           ip->di_nlink, ip->di_uid, ip->di_gid);
    ...
}

'%hd' can be 16-bit on many architectures, on these architectures, the 'printf' only print the low 16-bit of 'di_nlink'.

2. Reproducer
2.1. Commands
[root@localhost ~]# cd
[root@localhost ~]# xfs_mkfile 128m 128m.xfs
[root@localhost ~]# mkfs.xfs 128m.xfs
[root@localhost ~]# mount 128m.xfs /mnt/
[root@localhost ~]# cd /mnt/
[root@localhost mnt]# seq 1 65534|xargs mkdir -p
[root@localhost mnt]# cd
[root@localhost ~]# umount /mnt/
[root@localhost ~]# xfs_logprint 128m.xfs|grep nlink|tail -1

2.2. Expect result
nlink 65536

2.3. Actual result
nlink 0

Signed-off-by: hexiaole <hexiaole@kylinos.cn>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
---
 logprint/log_misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/logprint/log_misc.c b/logprint/log_misc.c
index 35e926a..6add28e 100644
--- a/logprint/log_misc.c
+++ b/logprint/log_misc.c
@@ -444,7 +444,7 @@ xlog_print_trans_inode_core(
     printf(_("magic 0x%hx mode 0%ho version %d format %d\n"),
 	   ip->di_magic, ip->di_mode, (int)ip->di_version,
 	   (int)ip->di_format);
-    printf(_("nlink %hd uid %d gid %d\n"),
+    printf(_("nlink %" PRIu32 " uid %d gid %d\n"),
 	   ip->di_nlink, ip->di_uid, ip->di_gid);
     printf(_("atime 0x%llx mtime 0x%llx ctime 0x%llx\n"),
 		xlog_extract_dinode_ts(ip->di_atime),
-- 
2.27.0

