1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 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 */ 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 { 43 if (!jffs2_is_writebuffered(c)) { 44 if (jffs2_sum_active()) { 45 int res; 46 res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to); 47 if (res) { 48 return res; 49 } 50 } 51 } 52 53 if (c->mtd->writev) 54 return c->mtd->writev(c->mtd, vecs, count, to, retlen); 55 else { 56 return mtd_fake_writev(c->mtd, vecs, count, to, retlen); 57 } 58 } 59 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 } 80