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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