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

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

fs/ceph/dir.c

+5 −1
Original line number Diff line number Diff line
@@ -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)

{

	struct ceph_inode_info *dci = ceph_inode(dir);

	unsigned hash;



	switch (dci->i_dir_layout.dl_dir_hash) {

	case 0:	/* for backward compat */
@@ -1773,8 +1774,11 @@ unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) 
		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;

	}

}