linux-kernel - [PATCH v5 13/19] vfs: make do_unlinkat retry on ESTALE errors

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Date:	Wed,  8 Aug 2012 09:21:36 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	viro@...IV.linux.org.uk
Cc:	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, michael.brantley@...haw.com,
	hch@...radead.org, miklos@...redi.hu, pstaubach@...grid.com
Subject: [PATCH v5 13/19] vfs: make do_unlinkat retry on ESTALE errors

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/namei.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/fs/namei.c b/fs/namei.c
index 7eb59cc..0c112c3 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3392,8 +3392,14 @@ static long do_unlinkat(int dfd, const char __user *pathname)
 	struct dentry *dentry;
 	struct nameidata nd;
 	struct inode *inode = NULL;
+	unsigned int try = 0;
+	unsigned int lookup_flags = LOOKUP_PARENT;
 
-	error = user_path_parent(dfd, pathname, &nd, &name);
+	name = getname(pathname);
+	if (IS_ERR(name))
+		return PTR_ERR(name);
+retry:
+	error = do_path_lookup(dfd, name, lookup_flags, &nd);
 	if (error)
 		return error;
 
@@ -3430,6 +3436,10 @@ exit2:
 	mnt_drop_write(nd.path.mnt);
 exit1:
 	path_put(&nd.path);
+	if (retry_estale(error, try++)) {
+		lookup_flags |= LOOKUP_REVAL;
+		goto retry;
+	}
 	putname(name);
 	return error;
 
-- 
1.7.11.2

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