ia64/linux-2.6.18-xen.hg

view fs/jffs2/writev.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright (C) 2001, 2002 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 * $Id: writev.c,v 1.8 2005/09/09 15:11:58 havasi Exp $
11 *
12 */
14 #include <linux/kernel.h>
15 #include <linux/mtd/mtd.h>
16 #include "nodelist.h"
18 /* This ought to be in core MTD code. All registered MTD devices
19 without writev should have this put in place. Bug the MTD
20 maintainer */
21 static inline int mtd_fake_writev(struct mtd_info *mtd, const struct kvec *vecs,
22 unsigned long count, loff_t to, size_t *retlen)
23 {
24 unsigned long i;
25 size_t totlen = 0, thislen;
26 int ret = 0;
28 for (i=0; i<count; i++) {
29 if (!vecs[i].iov_len)
30 continue;
31 ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
32 totlen += thislen;
33 if (ret || thislen != vecs[i].iov_len)
34 break;
35 to += vecs[i].iov_len;
36 }
37 if (retlen)
38 *retlen = totlen;
39 return ret;
40 }
42 int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
43 unsigned long count, loff_t to, size_t *retlen)
44 {
45 if (!jffs2_is_writebuffered(c)) {
46 if (jffs2_sum_active()) {
47 int res;
48 res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to);
49 if (res) {
50 return res;
51 }
52 }
53 }
55 if (c->mtd->writev)
56 return c->mtd->writev(c->mtd, vecs, count, to, retlen);
57 else {
58 return mtd_fake_writev(c->mtd, vecs, count, to, retlen);
59 }
60 }
62 int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
63 size_t *retlen, const u_char *buf)
64 {
65 int ret;
66 ret = c->mtd->write(c->mtd, ofs, len, retlen, buf);
68 if (jffs2_sum_active()) {
69 struct kvec vecs[1];
70 int res;
72 vecs[0].iov_base = (unsigned char *) buf;
73 vecs[0].iov_len = len;
75 res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs);
76 if (res) {
77 return res;
78 }
79 }
80 return ret;
81 }