From dd3e2c55a45fe75f3213b17b74f9a32380f4e84b Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 3 Oct 2013 21:21:39 -0400
Subject: [PATCH] fuse: rcu-delay freeing fuse_conn
makes ->permission() and ->d_revalidate() safety in RCU mode independent
from vfsmount_lock.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/fuse/cuse.c | 2 +-
fs/fuse/fuse_i.h | 2 ++
fs/fuse/inode.c | 2 +-
3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index adbfd66b380f..8ca88d716dd3 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -473,7 +473,7 @@ static int cuse_send_init(struct cuse_conn *cc)
static void cuse_fc_release(struct fuse_conn *fc)
{
struct cuse_conn *cc = fc_to_cc(fc);
- kfree(cc);
+ kfree_rcu(cc, fc.rcu);
}
/**
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index fe446c222e3f..4715674f050c 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -377,6 +377,8 @@ struct fuse_conn {
/** Refcount */
atomic_t count;
+ struct rcu_head rcu;
+
/** The user id for this mount */
kuid_t user_id;
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 1c15613c64f8..d468643a68b2 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -918,7 +918,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
static void fuse_free_conn(struct fuse_conn *fc)
{
- kfree(fc);
+ kfree_rcu(fc, rcu);
}
static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
--
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