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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright (C) 2001, 2002 Red Hat, Inc.
5 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
Ferenc Havasi8acff5e2005-09-09 16:12:01 +010010 * $Id: writev.c,v 1.8 2005/09/09 15:11:58 havasi Exp $
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/mtd/mtd.h>
16#include "nodelist.h"
17
18/* This ought to be in core MTD code. All registered MTD devices
19 without writev should have this put in place. Bug the MTD
20 maintainer */
21static inline int mtd_fake_writev(struct mtd_info *mtd, const struct kvec *vecs,
22 unsigned long count, loff_t to, size_t *retlen)
23{
24 unsigned long i;
25 size_t totlen = 0, thislen;
26 int ret = 0;
27
28 for (i=0; i<count; i++) {
29 if (!vecs[i].iov_len)
30 continue;
31 ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
32 totlen += thislen;
33 if (ret || thislen != vecs[i].iov_len)
34 break;
35 to += vecs[i].iov_len;
36 }
37 if (retlen)
38 *retlen = totlen;
39 return ret;
40}
41
42int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
43 unsigned long count, loff_t to, size_t *retlen)
44{
Ferenc Havasi8acff5e2005-09-09 16:12:01 +010045 if (!jffs2_is_writebuffered(c)) {
Ferenc Havasie631ddb2005-09-07 09:35:26 +010046 if (jffs2_sum_active()) {
47 int res;
Ferenc Havasie631ddb2005-09-07 09:35:26 +010048 res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to);
49 if (res) {
50 return res;
51 }
52 }
Ferenc Havasi8acff5e2005-09-09 16:12:01 +010053 }
Ferenc Havasie631ddb2005-09-07 09:35:26 +010054
Ferenc Havasi8acff5e2005-09-09 16:12:01 +010055 if (c->mtd->writev)
56 return c->mtd->writev(c->mtd, vecs, count, to, retlen);
57 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 return mtd_fake_writev(c->mtd, vecs, count, to, retlen);
Ferenc Havasie631ddb2005-09-07 09:35:26 +010059 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070060}
61
Ferenc Havasie631ddb2005-09-07 09:35:26 +010062int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
63 size_t *retlen, const u_char *buf)
64{
65 int ret;
66 ret = c->mtd->write(c->mtd, ofs, len, retlen, buf);
67
68 if (jffs2_sum_active()) {
69 struct kvec vecs[1];
70 int res;
71
72 vecs[0].iov_base = (unsigned char *) buf;
73 vecs[0].iov_len = len;
74
75 res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs);
76 if (res) {
77 return res;
78 }
79 }
80 return ret;
81}