xref: /openbmc/linux/fs/jffs2/writev.c (revision 8acff5e9)
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  */
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 (!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 	}
54 
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 }
61 
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);
67 
68 	if (jffs2_sum_active()) {
69 		struct kvec vecs[1];
70 		int res;
71 
72 		vecs[0].iov_base = (unsigned char *) buf;
73 		vecs[0].iov_len = len;
74 
75 		res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs);
76 		if (res) {
77 			return res;
78 		}
79 	}
80 	return ret;
81 }
82