11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * JFFS2 -- Journalling Flash File System, Version 2. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001, 2002 Red Hat, Inc. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Created by David Woodhouse <dwmw2@infradead.org> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * For licensing information, see the file 'LICENCE' in this directory. 91da177e4SLinus Torvalds * 108acff5e9SFerenc Havasi * $Id: writev.c,v 1.8 2005/09/09 15:11:58 havasi Exp $ 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds */ 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds #include <linux/kernel.h> 151da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 161da177e4SLinus Torvalds #include "nodelist.h" 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds /* This ought to be in core MTD code. All registered MTD devices 191da177e4SLinus Torvalds without writev should have this put in place. Bug the MTD 201da177e4SLinus Torvalds maintainer */ 211da177e4SLinus Torvalds static inline int mtd_fake_writev(struct mtd_info *mtd, const struct kvec *vecs, 221da177e4SLinus Torvalds unsigned long count, loff_t to, size_t *retlen) 231da177e4SLinus Torvalds { 241da177e4SLinus Torvalds unsigned long i; 251da177e4SLinus Torvalds size_t totlen = 0, thislen; 261da177e4SLinus Torvalds int ret = 0; 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds for (i=0; i<count; i++) { 291da177e4SLinus Torvalds if (!vecs[i].iov_len) 301da177e4SLinus Torvalds continue; 311da177e4SLinus Torvalds ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base); 321da177e4SLinus Torvalds totlen += thislen; 331da177e4SLinus Torvalds if (ret || thislen != vecs[i].iov_len) 341da177e4SLinus Torvalds break; 351da177e4SLinus Torvalds to += vecs[i].iov_len; 361da177e4SLinus Torvalds } 371da177e4SLinus Torvalds if (retlen) 381da177e4SLinus Torvalds *retlen = totlen; 391da177e4SLinus Torvalds return ret; 401da177e4SLinus Torvalds } 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs, 431da177e4SLinus Torvalds unsigned long count, loff_t to, size_t *retlen) 441da177e4SLinus Torvalds { 458acff5e9SFerenc Havasi if (!jffs2_is_writebuffered(c)) { 46e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 47e631ddbaSFerenc Havasi int res; 48e631ddbaSFerenc Havasi res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to); 49e631ddbaSFerenc Havasi if (res) { 50e631ddbaSFerenc Havasi return res; 51e631ddbaSFerenc Havasi } 521da177e4SLinus Torvalds } 538acff5e9SFerenc Havasi } 541da177e4SLinus Torvalds 558acff5e9SFerenc Havasi if (c->mtd->writev) 568acff5e9SFerenc Havasi return c->mtd->writev(c->mtd, vecs, count, to, retlen); 578acff5e9SFerenc Havasi else { 58e631ddbaSFerenc Havasi return mtd_fake_writev(c->mtd, vecs, count, to, retlen); 59e631ddbaSFerenc Havasi } 60e631ddbaSFerenc Havasi } 61e631ddbaSFerenc Havasi 62e631ddbaSFerenc Havasi int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, 63e631ddbaSFerenc Havasi size_t *retlen, const u_char *buf) 64e631ddbaSFerenc Havasi { 65e631ddbaSFerenc Havasi int ret; 66e631ddbaSFerenc Havasi ret = c->mtd->write(c->mtd, ofs, len, retlen, buf); 67e631ddbaSFerenc Havasi 68e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 69e631ddbaSFerenc Havasi struct kvec vecs[1]; 70e631ddbaSFerenc Havasi int res; 71e631ddbaSFerenc Havasi 72e631ddbaSFerenc Havasi vecs[0].iov_base = (unsigned char *) buf; 73e631ddbaSFerenc Havasi vecs[0].iov_len = len; 74e631ddbaSFerenc Havasi 75e631ddbaSFerenc Havasi res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs); 76e631ddbaSFerenc Havasi if (res) { 77e631ddbaSFerenc Havasi return res; 78e631ddbaSFerenc Havasi } 79e631ddbaSFerenc Havasi } 80e631ddbaSFerenc Havasi return ret; 81e631ddbaSFerenc Havasi } 82