linux-kernel - [PATCH 2/5] autofs4 - dont make expiring dentry negative fix

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Date:	Tue, 01 Jul 2008 17:25:58 +0800
From:	Ian Kent <raven@...maw.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	autofs mailing list <autofs@...ux.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/5] autofs4 - dont make expiring dentry negative fix

The correction to not make a dentry negative has an error.
Currently ->lookup() checks if an expire is in progress and removes
the entry from the list, before the expire is complete so if more
than one process is performing a lookup at this time only one will
wait for expire completion. We need to not remove the list entry
until after waiting for expire completion.

Signed-off-by: Ian Kent <raven@...maw.net>

---

 fs/autofs4/root.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)


diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 10add99..2a1a631 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -591,7 +591,6 @@ static struct dentry *autofs4_lookup_expiring(struct autofs_sb_info *sbi, struct
 			goto next;
 
 		if (d_unhashed(dentry)) {
-			list_del_init(&ino->expiring);
 			dget(dentry);
 			spin_unlock(&dentry->d_lock);
 			spin_unlock(&sbi->lookup_lock);
@@ -643,6 +642,10 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s
 			autofs4_wait(sbi, expiring, NFY_NONE);
 			DPRINTK("request completed");
 		}
+		spin_lock(&sbi->lookup_lock);
+		if (!list_empty(&ino->expiring))
+			list_del_init(&ino->expiring);
+		spin_unlock(&sbi->lookup_lock);
 		dput(expiring);
 	}
 
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