>On Tue, 2 Jul 2013, majianpeng wrote:
>> Now, update atime only for CEPH_CAP_FILE_EXCL.Change this if
>> CEPH_CAP_FILE_RD.
>
>Can we introduce a global config optoin (bool mds_atime in
>common/config_opts.h, maybe) so that users can turn this off? And/or add
>a 'relatime' option? More users won't want this as it is very expensive
>to maintain this extra level of metadata.
>
I don't know other client except cephfs.So the patch is from the view of using cephfs.
For cephfs,we can mount using 'noatime' to indicate don't update atime.
But for the other client, i don't know.
I think this should controled by client not server.
>That aside, this approach looks right to me. :)
>
>Thanks!
>sage
>
>
> >
>> Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
>> ---
>> src/mds/Locker.cc | 15 +++++++++------
>> 1 file changed, 9 insertions(+), 6 deletions(-)
>>
>> diff --git a/src/mds/Locker.cc b/src/mds/Locker.cc
>> index 30e014a..58f953f 100644
>> --- a/src/mds/Locker.cc
>> +++ b/src/mds/Locker.cc
>> @@ -2676,8 +2676,9 @@ void Locker::_do_snap_update(CInode *in, snapid_t snap, int dirty, snapid_t foll
>> void Locker::_update_cap_fields(CInode *in, int dirty, MClientCaps *m, inode_t *pi)
>> {
>> // file
>> + utime_t atime = m->get_atime();
>> +
>> if (dirty & (CEPH_CAP_FILE_EXCL|CEPH_CAP_FILE_WR)) {
>> - utime_t atime = m->get_atime();
>> utime_t mtime = m->get_mtime();
>> utime_t ctime = m->get_ctime();
>> uint64_t size = m->get_size();
>> @@ -2700,11 +2701,7 @@ void Locker::_update_cap_fields(CInode *in, int dirty, MClientCaps *m, inode_t *
>> pi->size = size;
>> pi->rstat.rbytes = size;
>> }
>> - if ((dirty & CEPH_CAP_FILE_EXCL) && atime != pi->atime) {
>> - dout(7) << " atime " << pi->atime << " -> " << atime
>> - << " for " << *in << dendl;
>> - pi->atime = atime;
>> - }
>> +
>> if ((dirty & CEPH_CAP_FILE_EXCL) &&
>> ceph_seq_cmp(pi->time_warp_seq, m->get_time_warp_seq()) < 0) {
>> dout(7) << " time_warp_seq " << pi->time_warp_seq << " -> " << m->get_time_warp_seq()
>> @@ -2712,6 +2709,12 @@ void Locker::_update_cap_fields(CInode *in, int dirty, MClientCaps *m, inode_t *
>> pi->time_warp_seq = m->get_time_warp_seq();
>> }
>> }
>> +
>> + if ((dirty & CEPH_CAP_FILE_RD) && atime > pi->atime) {
>> + dout(7) << " atime " << pi->atime << " -> " << atime
>> + << " for " << *in << dendl;
>> + pi->atime = atime;
>> + }
>> // auth
>> if (dirty & CEPH_CAP_AUTH_EXCL) {
>> if (m->head.uid != pi->uid) {
>> --
>> 1.8.3.rc1.44.gb387c77
>> ?韬{.n?????%??檩??w?{.n????u朕?Ф?塄}?财??j:+v?? ? ???2??璀??摺?囤??z夸z罐?+?????w棹f
