Commit 76a495d6 authored by Jeff Layton's avatar Jeff Layton Committed by Ilya Dryomov

ceph: ensure d_name stability in ceph_dentry_hash()

Take the d_lock here to ensure that d_name doesn't change.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarJeff Layton <jlayton@kernel.org>
Reviewed-by: default avatar"Yan, Zheng" <zyan@redhat.com>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 1bcb3440
...@@ -1766,6 +1766,7 @@ static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, ...@@ -1766,6 +1766,7 @@ static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
{ {
struct ceph_inode_info *dci = ceph_inode(dir); struct ceph_inode_info *dci = ceph_inode(dir);
unsigned hash;
switch (dci->i_dir_layout.dl_dir_hash) { switch (dci->i_dir_layout.dl_dir_hash) {
case 0: /* for backward compat */ case 0: /* for backward compat */
...@@ -1773,8 +1774,11 @@ unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) ...@@ -1773,8 +1774,11 @@ unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
return dn->d_name.hash; return dn->d_name.hash;
default: 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); dn->d_name.name, dn->d_name.len);
spin_unlock(&dn->d_lock);
return hash;
} }
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment