/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright © 2001-2007 Red Hat, Inc. * * Created by David Woodhouse <dwmw2@infradead.org> * * For licensing information, see the file 'LICENCE' in this directory. * */ #include <linux/kernel.h> #include <linux/mtd/mtd.h> #include "nodelist.h" /* This ought to be in core MTD code. All registered MTD devices without writev should have this put in place. Bug the MTD maintainer */ static inline int mtd_fake_writev(struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen) { unsigned long i; size_t totlen = 0, thislen; int ret = 0; for (i=0; i<count; i++) { if (!vecs[i].iov_len) continue; ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base); totlen += thislen; if (ret || thislen != vecs[i].iov_len) break; to += vecs[i].iov_len; } if (retlen) *retlen = totlen; return ret; } int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen) { if (!jffs2_is_writebuffered(c)) { if (jffs2_sum_active()) { int res; res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to); if (res) { return res; } } } if (c->mtd->writev) return c->mtd->writev(c->mtd, vecs, count, to, retlen); else { return mtd_fake_writev(c->mtd, vecs, count, to, retlen); } } int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, const u_char *buf) { int ret; ret = c->mtd->write(c->mtd, ofs, len, retlen, buf); if (jffs2_sum_active()) { struct kvec vecs[1]; int res; vecs[0].iov_base = (unsigned char *) buf; vecs[0].iov_len = len; res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs); if (res) { return res; } } return ret; }