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