[Gluster-users] question about nfs lookup result
cheneydeng88 at gmail.com
Wed Nov 16 14:08:14 UTC 2016
Thank you so much.Soumya,you make me more clear about the logic of the code.
I used to wonder the code was to handle the last resolve case.However i
the "nfs3_fh_resolve_entry_hard" and I thought it would get the ret == -2
case and went
into the "nfs3_lookup_op" branch,and finally call the
no chance to call "nfs3_fh_resolve_entry_lookup_cbk" because it was a LOOKUP
operation.Am i wrong again? :-)
2016-11-16 21:45 GMT+08:00 Soumya Koduri <skoduri at redhat.com>:
> On 11/16/2016 06:38 PM, Pranith Kumar Karampuri wrote:
>> Added people who know nfs code.
>> On Wed, Nov 16, 2016 at 6:21 PM, jin deng <cheneydeng88 at gmail.com
>> <mailto:cheneydeng88 at gmail.com>> wrote:
>> Hi all,
>> I'm reading the code of 3.6.9 version and got a question.And I'm
>> not very familiar with the code,so I have to confirm it(I checked
>> the master branch,it's same with 3.6.9).
>> The question is about the 'lookup' operation of NFS.And i'm with
>> this code flow:
>> nfs3_lookup (nfs3.c) ==> nfs3_fh_resolve_and_resume
>> ==> nfs3_fh_resolve_root ==> nfs3_fh_resolve_resume
>> ==> nfs3_fh_resolve_entry ==> nfs3_fh_resolve_entry_hard.
>> Now enter the "nfs_entry_loc_fill" and return with -1 which means
>> the "parent" not found,so we have to do hard resolve about the
>> parent. After doing a hard resolve,we get into the callback
>> "nfs3_fh_resolve_inode_lookup_cbk".And the callback has the
>> following code:
>> >>> memcpy (&cs->stbuf, buf, sizeof(*buf));
>> >>> memcpy (&cs->postparent, buf, sizeof(*postparent))
> This must had been done (and required) in case if this was the last
> entry(/inode) to be looked up
>> I think we've just done a parent resolve,how could we assign the
>> parent result into the "stbuf" and "postparent".The later two should
>> be the information of the child file/directory.Do i made a
> In case if it was not the last entry we fall through below code in
> "nfs3_fh_resolve_inode_lookup_cbk" -
> if (cs->resolventry)
> nfs3_fh_resolve_entry_hard (cs);
> Callback is "nfs3_fh_resolve_entry_lookup_cbk()" where in cs->stbuf and
> cs->postparent get overridden with the values corresponding to the child
>> Thanks advance for your help.
>> Gluster-users mailing list
>> Gluster-users at gluster.org <mailto:Gluster-users at gluster.org>
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