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3af5ae2203
In ceph mainline it will allow to set the btime in the setattr request
and just add a 'btime' member in the union 'ceph_mds_request_args' and
then bump up the header version to 4. That means the total size of union
'ceph_mds_request_args' will increase sizeof(struct ceph_timespec) bytes,
but in kclient it will increase the sizeof(setattr_ext) bytes for each
request.
Since the MDS will always depend on the header's vesion and front_len
members to decode the 'ceph_mds_request_head' struct, at the same time
kclient hasn't supported the 'btime' feature yet in setattr request,
so it's safe to do this change here.
This will save 48 bytes memories for each request.
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.