rgw: don't write bucket_header when it is not changed in bucket_link/unlink

[shashalu]

Signed-off-by: Shasha Lu lu.shasha@eisoo.com

[ZVampirEM77]

@shashalu Have you passed the compiling in your local env? I can not find the definition of "header" in

if (op.log_op && !header.syncstopped) {

and I compile it in my local env, the result is
/home/vvv/ceph/src/cls/rgw/cls_rgw.cc: In function ‘int rgw_bucket_link_olh(cls_method_context_t, ceph::bufferlist*, ceph::bufferlist*)’: /home/vvv/ceph/src/cls/rgw/cls_rgw.cc:1518:21: error: ‘header’ was not declared in this scope if (op.log_op && !header.syncstopped) { ^ /home/vvv/ceph/src/cls/rgw/cls_rgw.cc:1519:34: error: redeclaration of ‘rgw_bucket_dir_header header’ struct rgw_bucket_dir_header header; ^ /home/vvv/ceph/src/cls/rgw/cls_rgw.cc:1518:21: error: ‘<typeprefixerror>header’ previously declared here if (op.log_op && !header.syncstopped) { ^ /home/vvv/ceph/src/cls/rgw/cls_rgw.cc: In function ‘int rgw_bucket_unlink_instance(cls_method_context_t, ceph::bufferlist*, ceph::bufferlist*)’: /home/vvv/new_ceph/ceph/src/cls/rgw/cls_rgw.cc:1676:21: error: ‘header’ was not declared in this scope if (op.log_op && !header.syncstopped) { ^ /home/vvv/ceph/src/cls/rgw/cls_rgw.cc:1677:34: error: redeclaration of ‘rgw_bucket_dir_header header’ struct rgw_bucket_dir_header header; ^ /home/vvv/ceph/src/cls/rgw/cls_rgw.cc:1676:21: error: ‘<typeprefixerror>header’ previously declared here if (op.log_op && !header.syncstopped) { ^ make[3]: *** [src/cls/CMakeFiles/cls_rgw.dir/rgw/cls_rgw.cc.o] Error 1 make[3]: *** Waiting for unfinished jobs....

[ZVampirEM77]

My local branch is the newest master branch
`git log

commit b133a6d95a08a4fc89508f439adf4518da16cb33
Author: lu.shasha lu.shasha@eisoo.com
Date: Wed Aug 30 11:41:12 2017 +0800

rgw: don't read/write bucket_header when bucket_header is not changed in bucket_link/unlink

Signed-off-by: Shasha Lu <lu.shasha@eisoo.com>

commit 5923e77
Merge: fb795f5 fee7666
Author: Haomai Wang haomaiwang@gmail.com
Date: Wed Aug 30 22:19:12 2017 -0700

Merge pull request #17145 from optimistyzy/822_bl

os/bluestore/NVMEDevice: change write_bl to bl

Reviewed-by: Haomai Wang <haomai@xsky.com>

...`

[shashalu]

@ZVampirEM77 sorry, I have made a mistake. Already revised.

[ZVampirEM77]

LGTM

[shashalu]

@cbodley Please take a look, thx

[yuriw]

http://pulpito.front.sepia.ceph.com:80/yuriw-2017-09-05_19:00:34-rgw-wip-yuri-testing2-2017-09-05-1600-distro-basic-smithi/

http://pulpito.ceph.com/yuriw-2017-09-05_21:20:16-rgw-wip-yuri-testing2-2017-09-05-1600-distro-basic-smithi/