82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/*
|
|
* JFFS2 -- Journalling Flash File System, Version 2.
|
|
*
|
|
* Copyright (C) 2001, 2002 Red Hat, Inc.
|
|
*
|
|
* Created by David Woodhouse <dwmw2@infradead.org>
|
|
*
|
|
* For licensing information, see the file 'LICENCE' in this directory.
|
|
*
|
|
* $Id: writev.c,v 1.8 2005/09/09 15:11:58 havasi Exp $
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include "nodelist.h"
|
|
|
|
/* This ought to be in core MTD code. All registered MTD devices
|
|
without writev should have this put in place. Bug the MTD
|
|
maintainer */
|
|
static inline int mtd_fake_writev(struct mtd_info *mtd, const struct kvec *vecs,
|
|
unsigned long count, loff_t to, size_t *retlen)
|
|
{
|
|
unsigned long i;
|
|
size_t totlen = 0, thislen;
|
|
int ret = 0;
|
|
|
|
for (i=0; i<count; i++) {
|
|
if (!vecs[i].iov_len)
|
|
continue;
|
|
ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
|
|
totlen += thislen;
|
|
if (ret || thislen != vecs[i].iov_len)
|
|
break;
|
|
to += vecs[i].iov_len;
|
|
}
|
|
if (retlen)
|
|
*retlen = totlen;
|
|
return ret;
|
|
}
|
|
|
|
int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
|
|
unsigned long count, loff_t to, size_t *retlen)
|
|
{
|
|
if (!jffs2_is_writebuffered(c)) {
|
|
if (jffs2_sum_active()) {
|
|
int res;
|
|
res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to);
|
|
if (res) {
|
|
return res;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (c->mtd->writev)
|
|
return c->mtd->writev(c->mtd, vecs, count, to, retlen);
|
|
else {
|
|
return mtd_fake_writev(c->mtd, vecs, count, to, retlen);
|
|
}
|
|
}
|
|
|
|
int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
|
|
size_t *retlen, const u_char *buf)
|
|
{
|
|
int ret;
|
|
ret = c->mtd->write(c->mtd, ofs, len, retlen, buf);
|
|
|
|
if (jffs2_sum_active()) {
|
|
struct kvec vecs[1];
|
|
int res;
|
|
|
|
vecs[0].iov_base = (unsigned char *) buf;
|
|
vecs[0].iov_len = len;
|
|
|
|
res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs);
|
|
if (res) {
|
|
return res;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|