linux-pinenote/net/9p/trans_common.h

/*
 * 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.
 *
 */

void p9_release_pages(struct page **, int);
int p9_payload_gup(char *, int *, struct page **, int);
int p9_nr_pages(char *, int);
[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> 2011-01-28 14:11:13 -08:00			`/*`
			`* 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.`
			`*`
			`*/`

fs/9p: Update zero-copy implementation in 9p * remove lot of update to different data structure * add a seperate callback for zero copy request. * above makes non zero copy code path simpler * remove conditionalizing TREAD/TREADDIR/TWRITE in the zero copy path * Fix the dotu p9_check_errors with zero copy. Add sufficient doc around * Add support for both in and output buffers in zero copy callback * pin and unpin pages in the same context * use helpers instead of defining page offset and rest of page ourself * Fix mem leak in p9_check_errors * Remove 'E' and 'F' in p9pdu_vwritef Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> 2011-08-16 10:50:10 +05:30			`void p9_release_pages(struct page **, int);`
			`int p9_payload_gup(char , int , struct page **, int);`
			`int p9_nr_pages(char *, int);`