From: Jeff Layton jlayton@kernel.org
commit 76a495d666e5043ffc315695f8241f5e94a98849 upstream.
Take the d_lock here to ensure that d_name doesn't change.
Cc: stable@vger.kernel.org Signed-off-by: Jeff Layton jlayton@kernel.org Reviewed-by: "Yan, Zheng" zyan@redhat.com Signed-off-by: Ilya Dryomov idryomov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/ceph/dir.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -1470,6 +1470,7 @@ void ceph_dentry_lru_del(struct dentry * unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) { struct ceph_inode_info *dci = ceph_inode(dir); + unsigned hash;
switch (dci->i_dir_layout.dl_dir_hash) { case 0: /* for backward compat */ @@ -1477,8 +1478,11 @@ unsigned ceph_dentry_hash(struct inode * return dn->d_name.hash;
default: - return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, + spin_lock(&dn->d_lock); + hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash, dn->d_name.name, dn->d_name.len); + spin_unlock(&dn->d_lock); + return hash; } }