linux-kernel - Re: [PATCH, v5] 9p: don't print IS

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Date:	Fri, 19 Dec 2008 22:22:48 +0000
From:	"Duane Griffin" <duaneg@...da.com>
To:	Eric Van Hensbergen <ericvh@...il.com>
Cc:	Duane Griffin <duaneg@...da.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ron Minnich <rminnich@...dia.gov>,
	Latchesar Ionkov <lucho@...kov.net>,
	v9fs-developer@...ts.sourceforge.net
Subject: Re: [PATCH, v5] 9p: don't print IS_ERR strings

On Fri, Dec 19, 2008 at 04:07:53PM -0600, Eric Van Hensbergen wrote:
> NAK - the print is a debug to mark function entry when debugging is on
> -- it is not intended to show only success.  If an erroneous s will
> cause the print to break then perhaps it should be parameterized, but
> the entire print shouldn't be pushed inside the if statement.

If s is an error then I suppose it will BUG when the printk tries to
dereference it. So I think a fix is necessary. How about this?

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 8fddfe8..e10c27d 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1022,7 +1022,9 @@ v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
 {
 	char *s = nd_get_link(nd);
 
-	P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
+	P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
+			IS_ERR(s) ? "<error>" : s);
+
 	if (!IS_ERR(s))
 		__putname(s);
 }

Cheers,
Duane.

-- 
"I never could learn to drink that blood and call it wine" - Bob Dylan
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