Hi Peng,
If you are interested in the code path of Ceph, these blogs may help:
How does a Ceph OSD handle a read message ? (in Firefly and up)
How does a Ceph OSD handle a write message ? (up to Emperor)
Here is the note about rados write I took when I read the source code:
| rados put <obj-name> [infile]
L [tools/rados/rados.cc] main()
L rados_tool_common()
L do_put()L io_ctx.write()
L io_ctx_impl->write()
L [librados/IoCtxImpl.cc] write()
L operate()
L op_submit()
L [osdc/Objecter.cc] op_submit()
L _op_submit()
L recalc_op_target()
send_op()
L messenger->send_message()
L [msg/SimpleMessenger.cc] _send_message()
L submit_message()
L pipe->_send()
L [msg/Pipe.h] _send()
L [msg/Pipe.cc] witer()
L write_message()
L do_sendmsg()
L sendmsg()
Hope these could help.
Regards,
Kai Zhang
At 2014-04-30 00:04:55,peng <peng....@qq.com> wrote:
In the librados.cc , I found the following code:
Step 1 .
file : librados.cc
void librados::ObjectWriteOperation::write(uint64_t off, const bufferlist& bl)
{
::ObjectOperation *o = (::ObjectOperation *)impl;
bufferlist c = bl;
o->write(off, c);
}
Step 2 . to find ::ObjectOperation
File : Objecter.h
struct ObjectOperation {
void write( .. ) {} // call add_data
void add_data( .. ) {} // call add_op
void add_op(...) {} // need OSDOp
}
Step 3. to find OSDOp
File : osd_types.h
struct OSDOp { ... }
But , the question is : how to transfer the data to rados-cluster??? I
assume that there will be some socket connection(tcp,etc) to transfer data ,
but I find nothing about socket connection..
Besides, I found something in IoCtxImpl.cc and throught it I found
ceph_tid_t Objecter::_op_submit(Op *op) in Objecter.cc .. It looks like the
real operation is here.
confused..Appreciate any help~!
------------------ 原始邮件 ------------------
发件人: "John Spray";<john.sp...@inktank.com>;
发送时间: 2014年4月29日(星期二) 下午5:59
收件人: "peng"<peng....@qq.com>;
抄送: "ceph-users"<ceph-users@lists.ceph.com>;
主题: Re: [ceph-users] Hey, Where can I find the source code of "
classObjectOperationImpl " ?
It's not a real class, just a type definition used for the
ObjectOperation::impl pointer. The actual object is an ObjectOperation.
src/librados/librados.cc
1797: impl = (ObjectOperationImpl *)new ::ObjectOperation;
John
On Tue, Apr 29, 2014 at 10:49 AM, peng <peng....@qq.com> wrote:
Hey,
I can find a declaration in librados.hpp , but when I try to find the source
code of ObjectOperatoinImpl , I find nothing ..
Is it a ghost class??
Confused.. Appreciate any help .
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