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by Alessio Igor Bogani
Import upstream version 3.2.0 |
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/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright © 2001-2007 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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*/
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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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