11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * JFFS2 -- Journalling Flash File System, Version 2. 31da177e4SLinus Torvalds * 4c00c310eSDavid Woodhouse * Copyright © 2001-2007 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 * 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/mtd/mtd.h> 141da177e4SLinus Torvalds #include "nodelist.h" 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds /* This ought to be in core MTD code. All registered MTD devices 171da177e4SLinus Torvalds without writev should have this put in place. Bug the MTD 181da177e4SLinus Torvalds maintainer */ 191da177e4SLinus Torvalds static inline int mtd_fake_writev(struct mtd_info *mtd, const struct kvec *vecs, 201da177e4SLinus Torvalds unsigned long count, loff_t to, size_t *retlen) 211da177e4SLinus Torvalds { 221da177e4SLinus Torvalds unsigned long i; 231da177e4SLinus Torvalds size_t totlen = 0, thislen; 241da177e4SLinus Torvalds int ret = 0; 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds for (i=0; i<count; i++) { 271da177e4SLinus Torvalds if (!vecs[i].iov_len) 281da177e4SLinus Torvalds continue; 29eda95cbfSArtem Bityutskiy ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen, 30eda95cbfSArtem Bityutskiy vecs[i].iov_base); 311da177e4SLinus Torvalds totlen += thislen; 321da177e4SLinus Torvalds if (ret || thislen != vecs[i].iov_len) 331da177e4SLinus Torvalds break; 341da177e4SLinus Torvalds to += vecs[i].iov_len; 351da177e4SLinus Torvalds } 361da177e4SLinus Torvalds if (retlen) 371da177e4SLinus Torvalds *retlen = totlen; 381da177e4SLinus Torvalds return ret; 391da177e4SLinus Torvalds } 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs, 421da177e4SLinus Torvalds unsigned long count, loff_t to, size_t *retlen) 431da177e4SLinus Torvalds { 448acff5e9SFerenc Havasi if (!jffs2_is_writebuffered(c)) { 45e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 46e631ddbaSFerenc Havasi int res; 47e631ddbaSFerenc Havasi res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to); 48e631ddbaSFerenc Havasi if (res) { 49e631ddbaSFerenc Havasi return res; 50e631ddbaSFerenc Havasi } 511da177e4SLinus Torvalds } 528acff5e9SFerenc Havasi } 531da177e4SLinus Torvalds 548acff5e9SFerenc Havasi if (c->mtd->writev) 55b0a31f7bSArtem Bityutskiy return mtd_writev(c->mtd, vecs, count, to, retlen); 568acff5e9SFerenc Havasi else { 57e631ddbaSFerenc Havasi return mtd_fake_writev(c->mtd, vecs, count, to, retlen); 58e631ddbaSFerenc Havasi } 59e631ddbaSFerenc Havasi } 60e631ddbaSFerenc Havasi 61e631ddbaSFerenc Havasi int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, 62e631ddbaSFerenc Havasi size_t *retlen, const u_char *buf) 63e631ddbaSFerenc Havasi { 64e631ddbaSFerenc Havasi int ret; 65eda95cbfSArtem Bityutskiy ret = mtd_write(c->mtd, ofs, len, retlen, buf); 66e631ddbaSFerenc Havasi 67e631ddbaSFerenc Havasi if (jffs2_sum_active()) { 68e631ddbaSFerenc Havasi struct kvec vecs[1]; 69e631ddbaSFerenc Havasi int res; 70e631ddbaSFerenc Havasi 71e631ddbaSFerenc Havasi vecs[0].iov_base = (unsigned char *) buf; 72e631ddbaSFerenc Havasi vecs[0].iov_len = len; 73e631ddbaSFerenc Havasi 74e631ddbaSFerenc Havasi res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs); 75e631ddbaSFerenc Havasi if (res) { 76e631ddbaSFerenc Havasi return res; 77e631ddbaSFerenc Havasi } 78e631ddbaSFerenc Havasi } 79e631ddbaSFerenc Havasi return ret; 80e631ddbaSFerenc Havasi } 81