linux-kernel - [PATCH 07/10] sysfs: use check_submounts_and

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Message-Id: <1378303556-7220-8-git-send-email-miklos@szeredi.hu>
Date:	Wed,  4 Sep 2013 16:05:53 +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,
	raven@...maw.net, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, mszeredi@...e.cz,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 07/10] sysfs: 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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/sysfs/dir.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index e068e74..fde8856 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -297,7 +297,6 @@ static int sysfs_dentry_delete(const struct dentry *dentry)
 static int sysfs_dentry_revalidate(struct dentry *dentry, unsigned int flags)
 {
 	struct sysfs_dirent *sd;
-	int is_dir;
 	int type;
 
 	if (flags & LOOKUP_RCU)
@@ -341,18 +340,15 @@ out_bad:
 	 * is performed at its new name the dentry will be readded
 	 * to the dcache hashes.
 	 */
-	is_dir = (sysfs_type(sd) == SYSFS_DIR);
 	mutex_unlock(&sysfs_mutex);
-	if (is_dir) {
-		/* If we have submounts we must allow the vfs caches
-		 * to lie about the state of the filesystem to prevent
-		 * leaks and other nasty things.
-		 */
-		if (have_submounts(dentry))
-			goto out_valid;
-		shrink_dcache_parent(dentry);
-	}
-	d_drop(dentry);
+
+	/* If we have submounts we must allow the vfs caches
+	 * to lie about the state of the filesystem to prevent
+	 * leaks and other nasty things.
+	 */
+	if (check_submounts_and_drop(dentry) != 0)
+		goto out_valid;
+
 	return 0;
 }
 
-- 
1.8.1.4

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