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Commit 56199016 authored by Yan, Zheng's avatar Yan, Zheng Committed by Ilya Dryomov
Browse files

ceph: use current_kernel_time() to get request time stamp 



ceph uses ktime_get_real_ts() to get request time stamp. In most
other cases, current_kernel_time() is used to get time stamp for
filesystem operations (called by current_time()).

There is granularity difference between ktime_get_real_ts() and
current_kernel_time(). The later one can be up to one jiffy behind
the former one. This can causes inode's ctime to go back.

Signed-off-by: default avatar"Yan, Zheng" <zyan@redhat.com>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 03f21904

fs/ceph/mds_client.c

+1 −3
Original line number Diff line number Diff line
@@ -1687,7 +1687,6 @@ struct ceph_mds_request * 
ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)

{

	struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);

	struct timespec ts;



	if (!req)

		return ERR_PTR(-ENOMEM);
@@ -1706,8 +1705,7 @@ ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) 
	init_completion(&req->r_safe_completion);

	INIT_LIST_HEAD(&req->r_unsafe_item);



	ktime_get_real_ts(&ts);

	req->r_stamp = timespec_trunc(ts, mdsc->fsc->sb->s_time_gran);

	req->r_stamp = timespec_trunc(current_kernel_time(), mdsc->fsc->sb->s_time_gran);



	req->r_op = op;

	req->r_direct_mode = mode;