From: Miklos Szeredi <miklos@szeredi.hu>
Date: Mon, 29 Jan 2007 21:19:54 +0000 (-0800)
Subject: [PATCH] fuse: fix bug in control filesystem mount
X-Git-Tag: v2.6.20-rc7~37
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff79544754631cf3d237ff47b7d0e7ab2d211fcf;p=linux-2.6

[PATCH] fuse: fix bug in control filesystem mount

The BUG in fuse_ctl_add_dentry() could be triggered if the control
filesystem was unmounted and mounted again while one or more fuse
filesystems were present.

The fix is to reset the dentry counter in fuse_ctl_kill_sb().

Bug reported by Florent Mertens.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 8c58bd4539..1794305f9e 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -193,8 +193,12 @@ static int fuse_ctl_get_sb(struct file_system_type *fs_type, int flags,
 
 static void fuse_ctl_kill_sb(struct super_block *sb)
 {
+	struct fuse_conn *fc;
+
 	mutex_lock(&fuse_mutex);
 	fuse_control_sb = NULL;
+	list_for_each_entry(fc, &fuse_conn_list, entry)
+		fc->ctl_ndents = 0;
 	mutex_unlock(&fuse_mutex);
 
 	kill_litter_super(sb);