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 1.7 2005/09/07 08:34:55 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 (c->mtd->writev) 46 return c->mtd->writev(c->mtd, vecs, count, to, retlen); 47 else { 48 if (jffs2_sum_active()) { 49 int res; 50 51 res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to); 52 if (res) { 53 return res; 54 } 55 } 56 57 return mtd_fake_writev(c->mtd, vecs, count, to, retlen); 58 } 59 } 60 61 int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, 62 size_t *retlen, const u_char *buf) 63 { 64 int ret; 65 ret = c->mtd->write(c->mtd, ofs, len, retlen, buf); 66 67 if (jffs2_sum_active()) { 68 struct kvec vecs[1]; 69 int res; 70 71 vecs[0].iov_base = (unsigned char *) buf; 72 vecs[0].iov_len = len; 73 74 res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs); 75 if (res) { 76 return res; 77 } 78 } 79 return ret; 80 } 81