[RFC][PATCH 20/27] unix_find_other() elevate write count for touch_atime()

[Dave Hansen <haveblue@us.ibm.com>]

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---

 lxc-dave/net/unix/af_unix.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff -puN net/unix/af_unix.c~elevate-writers-opens-part4 net/unix/af_unix.c
--- lxc/net/unix/af_unix.c~elevate-writers-opens-part4	2006-06-07 16:53:24.000000000 -0700
+++ lxc-dave/net/unix/af_unix.c	2006-06-07 16:53:24.000000000 -0700
@@ -676,21 +676,27 @@ static struct sock *unix_find_other(stru
 		err = path_lookup(sunname->sun_path, LOOKUP_FOLLOW, &nd);
 		if (err)
 			goto fail;
+
+		err = mnt_want_write(nd.mnt);
+		if (err)
+			goto put_path_fail;
+
 		err = vfs_permission(&nd, MAY_WRITE);
 		if (err)
-			goto put_fail;
+			goto put_write_fail;
 
 		err = -ECONNREFUSED;
 		if (!S_ISSOCK(nd.dentry->d_inode->i_mode))
-			goto put_fail;
+			goto put_write_fail;
 		u=unix_find_socket_byinode(nd.dentry->d_inode);
 		if (!u)
-			goto put_fail;
+			goto put_write_fail;
 
 		if (u->sk_type == type)
 			touch_atime(nd.mnt, nd.dentry);
 
 		path_release(&nd);
+		mnt_drop_write(nd.mnt);
 
 		err=-EPROTOTYPE;
 		if (u->sk_type != type) {
@@ -710,7 +716,9 @@ static struct sock *unix_find_other(stru
 	}
 	return u;
 
-put_fail:
+put_write_fail:
+	mnt_drop_write(nd.mnt);
+put_path_fail:
 	path_release(&nd);
 fail:
 	*error=err;
_