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
  16 int 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
  32 int 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 }