fuse: use req->page_descs[] for argpages cases

Previously, anyone who set flag 'argpages' only filled req->pages[] and set
per-request page_offset. This patch re-works all cases where argpages=1 to
fill req->page_descs[] properly.

Having req->page_descs[] filled properly allows to re-work fuse_copy_pages()
to copy page fragments described by req->page_descs[]. This will be useful
for next patches optimizing direct_IO.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index 5cc838f320d4..fb9dcfdf040b 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -449,6 +449,7 @@ static int cuse_send_init(struct cuse_conn *cc)
         req->out.argvar = 1;
         req->out.argpages = 1;
         req->pages[0] = page;
+        req->page_descs[0].length = req->out.args[1].size;
         req->num_pages = 1;
         req->end = cuse_process_init_reply;
         fuse_request_send_background(fc, req);