Re: Adding one variable to inode structure

[Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx>]

Oh you want applications to do getfattr to find that it is there?

I think I understood what you are looking for now. So basically applications will keep doing creation of some files/directories, whenever a video file is created you want the bricks to set an extended attribute on the directory, so that the application can use it. I don't think this doesn't look like the job of index xlator either.

Why do you not want to set the extended attribute from client and want the fs to do it on-behalf of the application? Setting it from client has benefits like even when one brick is down it will automatically heal this extended attribute etc.

On Mon, Jun 5, 2017 at 12:10 PM, Tahereh Fattahi <t28.fattahi@xxxxxxxxx> wrote:

I want in in mount directory in client side

On Mon, Jun 5, 2017 at 11:07 AM, Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx> wrote:

On Mon, Jun 5, 2017 at 11:24 AM, Tahereh Fattahi <t28.fattahi@xxxxxxxxx> wrote:

Thank you

I see that this xlator is loaded in server side. 

How can I access to variable in index xlator in client side?

is it correct? getfattr trusted.index.myvar 

To which xlator do you want this information? Or do you want this on mount?

 

On Mon, Jun 5, 2017 at 10:00 AM, Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx> wrote:

On Mon, Jun 5, 2017 at 9:55 AM, Tahereh Fattahi <t28.fattahi@xxxxxxxxx> wrote:

Assume that one client wants to search it's directories for video files.

 I want use something that helps this client to search just directories that have this kind of file. 

like a extended attribute, but I want this attribute be set by server not by client.

I dont know which xlator is suitable for this work.

The xlator that comes close to it is:  index xlator xlators/features/index/src

You may have to track extra operations like create/mknod/link/rename/unlink to make sure you get the functionality you want. Basically this xlator helps you in indexing a behavior. We use this for indexing directories/files that need heal etc.

 

On Mon, Jun 5, 2017 at 7:13 AM, Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx> wrote:

This sounds hacky. In general anything that is specific about an inode, we try to store it in inode-ctx. Who uses this information about presence of video-file and how? May be with that knowledge there could be a possibility we can improve the solution. Do let us know the complete problem you are trying to solve.

On Mon, Jun 5, 2017 at 4:53 AM, Tahereh Fattahi <t28.fattahi@xxxxxxxxx> wrote:

Hi

I want to add one boolean field to inode structure for a directory.

 when it is 1 it means that directory has one or more video file. when it is 0 it means that there is no video file in that directory.

I can add this variable to inode structure and update it in server side, in posix_create function (when there is a create request for a video file).

question is about client knowledge about this variable. is it possible that client can see the amount of this variable of different servers (bricks) and OR them to one variable in cient's inode of the directory? in which xlator I should try in client side?

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