1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright �� 2001-2007 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 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/mtd/mtd.h>
14#include "nodelist.h"
15
16/* This ought to be in core MTD code. All registered MTD devices
17   without writev should have this put in place. Bug the MTD
18   maintainer */
19static inline int mtd_fake_writev(struct mtd_info *mtd, const struct kvec *vecs,
20				  unsigned long count, loff_t to, size_t *retlen)
21{
22	unsigned long i;
23	size_t totlen = 0, thislen;
24	int ret = 0;
25
26	for (i=0; i<count; i++) {
27		if (!vecs[i].iov_len)
28			continue;
29		ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
30		totlen += thislen;
31		if (ret || thislen != vecs[i].iov_len)
32			break;
33		to += vecs[i].iov_len;
34	}
35	if (retlen)
36		*retlen = totlen;
37	return ret;
38}
39
40int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
41			      unsigned long count, loff_t to, size_t *retlen)
42{
43	if (!jffs2_is_writebuffered(c)) {
44		if (jffs2_sum_active()) {
45			int res;
46			res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to);
47			if (res) {
48				return res;
49			}
50		}
51	}
52
53	if (c->mtd->writev)
54		return c->mtd->writev(c->mtd, vecs, count, to, retlen);
55	else {
56		return mtd_fake_writev(c->mtd, vecs, count, to, retlen);
57	}
58}
59
60int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
61			size_t *retlen, const u_char *buf)
62{
63	int ret;
64	ret = c->mtd->write(c->mtd, ofs, len, retlen, buf);
65
66	if (jffs2_sum_active()) {
67		struct kvec vecs[1];
68		int res;
69
70		vecs[0].iov_base = (unsigned char *) buf;
71		vecs[0].iov_len = len;
72
73		res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs);
74		if (res) {
75			return res;
76		}
77	}
78	return ret;
79}
80