The O_DIRECT flag imposes alignment restrictions on the length and address
of userspace buffers and the file offset of I/Os.
While VirtFS/9P has plans to implement O_DIRECT behavior on the server,
for now we will stick to a behavior like NFS by bypassing the page cache
only on the client. Server may still cache the I/O.
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
if (s->proto_version == V9FS_PROTO_2000L) {
flags = vs->mode;
flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
+ /* Ignore direct disk access hint until the server supports it. */
+ flags &= ~O_DIRECT;
} else {
flags = omode_to_uflags(vs->mode);
}
v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
vs->name.data);
+ /* Ignore direct disk access hint until the server supports it. */
+ flags &= ~O_DIRECT;
+
vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid,
gid, flags, mode);
v9fs_lcreate_post_do_open2(s, vs, err);