fuse: add per-page descriptor <offset, length> to fuse_req

The ability to save page pointers along with lengths and offsets in fuse_req
will be useful to cover several iovec-s with a single fuse_req.

Per-request page_offset is removed because anybody who need it can use
req->page_descs[0].offset instead.

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

1 files changed, 12 insertions, 3 deletions

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 5b21e6ab9e75..70cef60afe0e 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -203,6 +203,12 @@ struct fuse_out {
         struct fuse_arg args[3];
 };
 
+/** FUSE page descriptor */
+struct fuse_page_desc {
+        unsigned int length;
+        unsigned int offset;
+};
+
 /** The request state */
 enum fuse_req_state {
         FUSE_REQ_INIT = 0,
@@ -296,18 +302,21 @@ struct fuse_req {
         /** page vector */
         struct page **pages;
 
+        /** page-descriptor vector */
+        struct fuse_page_desc *page_descs;
+
         /** size of the 'pages' array */
         unsigned max_pages;
 
         /** inline page vector */
         struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
 
+        /** inline page-descriptor vector */
+        struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
+
         /** number of pages in vector */
         unsigned num_pages;
 
-        /** offset of data on first page */
-        unsigned page_offset;
-
         /** File used in the request (or NULL) */
         struct fuse_file *ff;