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1da177e4 LT |
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 1.6 2004/11/16 20:36:12 dwmw2 Exp $ | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/mtd/mtd.h> | |
16 | #include "nodelist.h" | |
17 | ||
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; | |
27 | ||
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 | } | |
41 | ||
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 (c->mtd->writev) | |
46 | return c->mtd->writev(c->mtd, vecs, count, to, retlen); | |
47 | else | |
48 | return mtd_fake_writev(c->mtd, vecs, count, to, retlen); | |
49 | } | |
50 |