LXR linux/fs/jffs2/writev.c

   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
  16int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
  17                              unsigned long count, loff_t to, size_t *retlen)
  18{
  19        if (!jffs2_is_writebuffered(c)) {
  20                if (jffs2_sum_active()) {
  21                        int res;
  22                        res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to);
  23                        if (res) {
  24                                return res;
  25                        }
  26                }
  27        }
  28
  29        return mtd_writev(c->mtd, vecs, count, to, retlen);
  30}
  31
  32int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
  33                        size_t *retlen, const u_char *buf)
  34{
  35        int ret;
  36        ret = mtd_write(c->mtd, ofs, len, retlen, buf);
  37
  38        if (jffs2_sum_active()) {
  39                struct kvec vecs[1];
  40                int res;
  41
  42                vecs[0].iov_base = (unsigned char *) buf;
  43                vecs[0].iov_len = len;
  44
  45                res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs);
  46                if (res) {
  47                        return res;
  48                }
  49        }
  50        return ret;
  51}
  52