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authorVenkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>2011-01-28 14:11:13 -0800
committerEric Van Hensbergen <ericvh@gmail.com>2011-03-15 09:57:34 -0500
commit022cae36551ba805bf82084047945b2901d75f36 (patch)
tree5d8a8ff0eb2102d0449f58ddfcb8907bd3625682 /net/9p/trans_common.h
parent6752a1ebd13f69b9d5ff08914fe29ee2813cbeea (diff)
[net/9p] Preparation and helper functions for zero copy
This patch prepares p9_fcall structure for zero copy. Added fields send the payload buffer information to the transport layer. In addition it adds a 'private' field for the transport layer to store mapped/pinned page information so that it can be freed/unpinned during req_done. This patch also creates trans_common.[ch] to house helper functions. It adds the following helper functions. p9_release_req_pages - Release pages after the transaction. p9_nr_pages - Return number of pages needed to accomodate the payload. payload_gup - Translates user buffer into kernel pages. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net/9p/trans_common.h')
-rw-r--r--net/9p/trans_common.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/net/9p/trans_common.h b/net/9p/trans_common.h
new file mode 100644
index 000000000000..04977e0ad938
--- /dev/null
+++ b/net/9p/trans_common.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Author Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+/**
+ * struct trans_rpage_info - To store mapped page information in PDU.
+ * @rp_alloc:Set if this structure is allocd, not a reuse unused space in pdu.
+ * @rp_nr_pages: Number of mapped pages
+ * @rp_data: Array of page pointers
+ */
+struct trans_rpage_info {
+ u8 rp_alloc;
+ int rp_nr_pages;
+ struct page *rp_data[0];
+};
+
+void p9_release_req_pages(struct trans_rpage_info *);
+int p9_payload_gup(struct p9_req_t *, size_t *, int *, int, u8);
+int p9_nr_pages(struct p9_req_t *);

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