From: Jeff Layton <[email protected]> commit 76a495d666e5043ffc315695f8241f5e94a98849 upstream.
Take the d_lock here to ensure that d_name doesn't change. Cc: [email protected] Signed-off-by: Jeff Layton <[email protected]> Reviewed-by: "Yan, Zheng" <[email protected]> Signed-off-by: Ilya Dryomov <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- fs/ceph/dir.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -1308,6 +1308,7 @@ 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 */ @@ -1315,8 +1316,11 @@ 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; } }
