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@xxxxxxxxxx> 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@xxxxxxxxxx> 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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