Re: [BUG] debugfs: hard link count wrong

[tab@snarc.org (Vincent Hanquez)]

On Thu, Jan 26, 2006 at 11:17:49PM -0800, Greg KH wrote:
> I'm running 4.3.0, not 4.2.30.  I don't know where it came from either,
> gentoo's unstable tree has it, and caused me to download it from
> somewhere when I built it :)

looks like all fs that use simple_fill_super got a root inode with
i_nlink=1 at the start of day.

I've compared with shmem, the nlink is incremented to 2 by a call to
shmem_get_inode, when filling_super.

I've test the following patch with debugfs and securityfs, and its
seems to cure the problem.

------

Fix incorrect nlink of root inode for filesystems that use simple_fill_super

Signed-off-by: Vincent Hanquez <vincent@snarc.org>

diff -Naur a/fs/libfs.c a/fs/libfs.c
--- a/fs/libfs.c	2006-01-03 03:21:10.000000000 +0000
+++ b/fs/libfs.c	2006-01-27 17:43:31.000000000 +0000
@@ -388,6 +388,7 @@
 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 	inode->i_op = &simple_dir_inode_operations;
 	inode->i_fop = &simple_dir_operations;
+	inode->i_nlink = 2;
 	root = d_alloc_root(inode);
 	if (!root) {
 		iput(inode);