linux-kernel - [PATCH 5/9] nfs: use check_submounts_and

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Date:	Thu,  8 Aug 2013 17:24:46 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	rwheeler@...hat.com, avati@...hat.com, viro@...IV.linux.org.uk
Cc:	bfoster@...hat.com, dhowells@...hat.com, eparis@...hat.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	mszeredi@...e.cz, Trond Myklebust <Trond.Myklebust@...app.com>
Subject: [PATCH 5/9] nfs: use check_submounts_and_drop()

From: Miklos Szeredi <mszeredi@...e.cz>

Do have_submounts(), shrink_dcache_parent() and d_drop() atomically.

check_submounts_and_drop() can deal with negative dentries and
non-directories as well.

Non-directories can also be mounted on.  And just like directories we don't
want these to disappear with invalidation.

Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
CC: Trond Myklebust <Trond.Myklebust@...app.com>
---
 fs/nfs/dir.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e474ca2b..7468735 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1135,14 +1135,13 @@ out_zap_parent:
 	if (inode && S_ISDIR(inode->i_mode)) {
 		/* Purge readdir caches. */
 		nfs_zap_caches(inode);
-		/* If we have submounts, don't unhash ! */
-		if (have_submounts(dentry))
-			goto out_valid;
 		if (dentry->d_flags & DCACHE_DISCONNECTED)
 			goto out_valid;
-		shrink_dcache_parent(dentry);
 	}
-	d_drop(dentry);
+	/* If we have submounts, don't unhash ! */
+	if (check_submounts_and_drop(dentry) != 0)
+		goto out_valid;
+
 	dput(parent);
 	dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n",
 			__func__, dentry->d_parent->d_name.name,
-- 
1.8.1.4

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