[Gluster-users] does Gluster support O_DIRECT ?

[Deepak C Shetty]

On 03/14/2012 07:29 AM, Bill Bao wrote:
>
> This might be a question asked before, but I just couldn't effectively 
> search the whole archives,
>
> So please bear me and kindly advise.
>
> We have a 3^rd party application (video streaming kind of) which uses 
> directIO (O_DIRECT).
>
> On the server side, in the posix translator, we added the "option 
> o-direct enable"
>
> On the client side, we mounted as "mount -t glusterfs -o 
> direct-io-mode=enable server1:/test-volume /mnt/glusterfs"
>
> But the application still fails with error (cannot create/open file 
> with O_DIRECT).
>
> Then we trace to the fuse module in the kernel, which has following 
> checking:
>
> int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
>
> {
>
>         struct fuse_conn *fc = get_fuse_conn(inode);
>
>         int err;
>
>         /* VFS checks this, but only _after_ ->open() */
>
> *  if (file->f_flags & O_DIRECT)*
>
> *                return -EINVAL;*
>
>         err = generic_file_open(inode, file);
>
> looks like regardless what we configure on the gluster side, the FUSE 
> still rejects the O_DIRECT.
>
> Could someone shed light ? we're also trying to take out the O_DIRECT 
> checking in FUSE module,
>
> to see what will happen, will report soon.
>
> Bill Bao
>
O_DIRECT support for fuse was added recently. Check the fsdevel archives.
>
>
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