[Gluster-devel] How can add one fop after another fop?

[Tahereh Fattahi]

Thank you very much,
I check all of the alternative and see that
xlator/mount/fuse/src/fuse-bridge  fuse_create is the first

On Thu, Mar 30, 2017 at 5:18 PM, Niels de Vos <ndevos at redhat.com> wrote:

> On Thu, Mar 30, 2017 at 04:59:02PM +0430, Tahereh Fattahi wrote:
> > Yes, I know the architecture of translators, of course I dont want to
> > create a new translator.
>
> A new xlator, or an extension to an existing one (I can't think of any
> appropriate one though) would be the best solution.
>
> > If I understand that my idea is correct I will create one page in
> > uder_review tab, But I am not sure, I should test.
> > First I need to know which function firstly execute when a create
> operation
> > is running?
>
> There are create functions in the different 'master xlator' (which is
> the xlator that starts the top of the xlator-graph). For gfapi access
> this is the pub_glfs_creat() or pub_glfs_open() function. There are also
> functions in xlators/mount/fuse/src/fuse-bridge.c and under
> xlators/nfs/server/. If you place the function addition in its own
> xlator, it will be used by all access methods, and there would not be a
> need to make modifications everywhere.
>
> Niels
>
>
> >
> > On Thu, Mar 30, 2017 at 4:10 PM, Niels de Vos <ndevos at redhat.com> wrote:
> >
> > > On Thu, Mar 30, 2017 at 03:52:39PM +0430, Tahereh Fattahi wrote:
> > > > Thanks for your answer.
> > > > For example I want to save the number of files in directory as one
> > > extended
> > > > attribute.
> > > > After every create operation, this number should be added and set as
> > > > attribute, So after create I need a setxattr.
> > > > But I dont know where this create is completed, I tested in dht
> > > translator
> > > > and it was false because the creation is not complete in this
> translator.
> > >
> > > Each xlator receives the create procedure (and its callback). The
> > > "Glustr way" of doing this, could be to write your own xlator. Because
> > > this is a functionality we would like to see too, it would be a great
> > > opportunity to contribute such an xlator (or other approach?).
> > >
> > > My take on the functionality, is that the number of entries in a
> > > directory can be represented as (struct stat)->st_size of a directory
> > > inode. The Gluster internal representation could be stored as an xattr.
> > >
> > > You seem to be interested in implementing such a feature. If you write
> > > an email to this list with your proposal, we can work with you to get
> > > this included in one of the next versions.
> > >
> > > Once the approach has been settled upon, you can write a little design
> > > document for the glusterfs-specs repository [0].
> > >
> > > HTH,
> > > Niels
> > >
> > >
> > > 0. https://github.com/gluster/glusterfs-specs (use Gerrit to post
> docs)
> > >
> > >
> > > >
> > > > On Thu, Mar 30, 2017 at 3:44 PM, Niels de Vos <ndevos at redhat.com>
> wrote:
> > > >
> > > > > On Thu, Mar 30, 2017 at 07:03:28AM +0430, Tahereh Fattahi wrote:
> > > > > > Hi
> > > > > > I want after create any file, do one setxattr automatically ,
> where
> > > and
> > > > > how
> > > > > > I should add this operation, and in which translator?
> > > > >
> > > > > We would like to add support for compound (or composite) FOPs
> through
> > > > > libgfapi. This is currently not available yet, and I do not think
> > > anyone
> > > > > started working on it.
> > > > >
> > > > > Could you explain a little more about your use case for this?
> Concrete
> > > > > examples will help in understanding and pointing you to potential
> > > > > alternative solutions.
> > > > >
> > > > > Thanks,
> > > > > Niels
> > > > >
> > >
>
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