projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
| 3 | * | |
| c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
| 1da177e4 LT |
5 | * |
| 6 | * Created by David Woodhouse <[email protected]> | |
| 7 | * | |
| 8 | * For licensing information, see the file 'LICENCE' in this directory. | |
| 9 | * | |
| 1da177e4 LT |
10 | */ |
| 11 | ||
| 12 | #include <linux/kernel.h> | |
| 13 | #include <linux/mtd/mtd.h> | |
| 14 | #include "nodelist.h" | |
| 15 | ||
| 16 | /* This ought to be in core MTD code. All registered MTD devices | |
| 17 | without writev should have this put in place. Bug the MTD | |
| 18 | maintainer */ | |
| 19 | static inline int mtd_fake_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
| 20 | unsigned long count, loff_t to, size_t *retlen) | |
| 21 | { | |
| 22 | unsigned long i; | |
| 23 | size_t totlen = 0, thislen; | |
| 24 | int ret = 0; | |
| 25 | ||
| 26 | for (i=0; i<count; i++) { | |
| 27 | if (!vecs[i].iov_len) | |
| 28 | continue; | |
| 29 | ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base); | |
| 30 | totlen += thislen; | |
| 31 | if (ret || thislen != vecs[i].iov_len) | |
| 32 | break; | |
| 33 | to += vecs[i].iov_len; | |
| 34 | } | |
| 35 | if (retlen) | |
| 36 | *retlen = totlen; | |
| 37 | return ret; | |
| 38 | } | |
| 39 | ||
| 40 | int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs, | |
| 41 | unsigned long count, loff_t to, size_t *retlen) | |
| 42 | { | |
| 8acff5e9 | 43 | if (!jffs2_is_writebuffered(c)) { |
| e631ddba FH |
44 | if (jffs2_sum_active()) { |
| 45 | int res; | |
| e631ddba FH |
46 | res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to); |
| 47 | if (res) { | |
| 48 | return res; | |
| 49 | } | |
| 50 | } | |
| 8acff5e9 | 51 | } |
| e631ddba | 52 | |
| 8acff5e9 FH |
53 | if (c->mtd->writev) |
| 54 | return c->mtd->writev(c->mtd, vecs, count, to, retlen); | |
| 55 | else { | |
| 1da177e4 | 56 | return mtd_fake_writev(c->mtd, vecs, count, to, retlen); |
| e631ddba | 57 | } |
| 1da177e4 LT |
58 | } |
| 59 | ||
| e631ddba FH |
60 | int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, |
| 61 | size_t *retlen, const u_char *buf) | |
| 62 | { | |
| 63 | int ret; | |
| 64 | ret = c->mtd->write(c->mtd, ofs, len, retlen, buf); | |
| 65 | ||
| 66 | if (jffs2_sum_active()) { | |
| 67 | struct kvec vecs[1]; | |
| 68 | int res; | |
| 69 | ||
| 70 | vecs[0].iov_base = (unsigned char *) buf; | |
| 71 | vecs[0].iov_len = len; | |
| 72 | ||
| 73 | res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs); | |
| 74 | if (res) { | |
| 75 | return res; | |
| 76 | } | |
| 77 | } | |
| 78 | return ret; | |
| 79 | } |