linux-kernel - [PATCH] autofs4-2.6.34-rc1

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Message-ID: <20100510051830.10353.31165.stgit@localhost.localdomain>
Date:	Mon, 10 May 2010 13:18:30 +0800
From:	Ian Kent <raven@...maw.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: [PATCH] autofs4-2.6.34-rc1 - fix link_count usage

Following the commit below in 2.6.34-rc1 autofs direct mounts stop
working. This is caused by current->link_count being 0 when
->follow_link() is called from do_filp_open().

I can't work out why this hasn't been seen before Als patch series.

This patch removes the autofs dependence on current->link_count.

1f36f774b22a0ceb7dd33eca626746c81a97b6a5 is the first bad commit
commit 1f36f774b22a0ceb7dd33eca626746c81a97b6a5
Author: Al Viro <viro@...iv.linux.org.uk>
Date:   Sat Dec 26 10:56:19 2009 -0500

    Switch !O_CREAT case to use of do_last()

    ... and now we have all intents crap well localized

    Signed-off-by: Al Viro <viro@...iv.linux.org.uk>

:040000 040000 53c1effc5b22746bb83cdbc6a419bf898067882d 9606f7275fde188a056fd174aa1d622ac0630893 M	fs
---

 fs/autofs4/root.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 109a6c6..a7e04ad 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -177,8 +177,7 @@ static int try_to_fill_dentry(struct dentry *dentry, int flags)
 		}
 	/* Trigger mount for path component or follow link */
 	} else if (ino->flags & AUTOFS_INF_PENDING ||
-			autofs4_need_mount(flags) ||
-			current->link_count) {
+			autofs4_need_mount(flags)) {
 		DPRINTK("waiting for mount name=%.*s",
 			dentry->d_name.len, dentry->d_name.name);
 
@@ -262,7 +261,7 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
 		spin_unlock(&dcache_lock);
 		spin_unlock(&sbi->fs_lock);
 
-		status = try_to_fill_dentry(dentry, 0);
+		status = try_to_fill_dentry(dentry, lookup_type);
 		if (status)
 			goto out_error;
 

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