UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

ceph: use READ_ONCE to access d_parent in RCU critical section 

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2019-05-23 10:22:55 +08:00 committed by Ilya Dryomov
parent feab6ac25d
commit 41883ba8ee
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/ceph/mds_client.c
View File

@ -913,7 +913,7 @@ static int __choose_mds(struct ceph_mds_client *mdsc,
struct inode *dir;
rcu_read_lock();
parent = req->r_dentry->d_parent;
parent = READ_ONCE(req->r_dentry->d_parent);
dir = req->r_parent ? : d_inode_rcu(parent);
if (!dir || dir->i_sb != mdsc->fsc->sb) {
@ -2145,7 +2145,7 @@ retry:
memcpy(path + pos, temp->d_name.name, temp->d_name.len);
}
spin_unlock(&temp->d_lock);
temp = temp->d_parent;
temp = READ_ONCE(temp->d_parent);
/* Are we at the root? */
if (IS_ROOT(temp))