diff options
Diffstat (limited to 'fs/jffs2/wbuf.c')
-rw-r--r-- | fs/jffs2/wbuf.c | 203 |
1 files changed, 67 insertions, 136 deletions
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c index 9c99859f5edd..58cb77baed8e 100644 --- a/fs/jffs2/wbuf.c +++ b/fs/jffs2/wbuf.c @@ -957,43 +957,48 @@ exit: return ret; } -#define NR_OOB_SCAN_PAGES 4 +#define NR_OOB_SCAN_PAGES 4 + +/* For historical reasons we use only 12 bytes for OOB clean marker */ +#define OOB_CM_SIZE 12 + +static const struct jffs2_unknown_node oob_cleanmarker = +{ + .magic = cpu_to_je16(JFFS2_MAGIC_BITMASK), + .nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER), + .totlen = cpu_to_je32(8) +}; /* - * Check, if the out of band area is empty + * Check, if the out of band area is empty. This function knows about the clean + * marker and if it is present in OOB, treats the OOB as empty anyway. */ int jffs2_check_oob_empty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int mode) { - int i, page, ret; - int oobsize = c->mtd->oobsize; + int i, ret; + int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE); struct mtd_oob_ops ops; - ops.ooblen = NR_OOB_SCAN_PAGES * oobsize; + ops.mode = MTD_OOB_AUTO; + ops.ooblen = NR_OOB_SCAN_PAGES * c->oobavail; ops.oobbuf = c->oobbuf; - ops.ooboffs = 0; + ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0; ops.datbuf = NULL; - ops.mode = MTD_OOB_PLACE; ret = c->mtd->read_oob(c->mtd, jeb->offset, &ops); - if (ret) { - D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB " - "failed %d for block at %08x\n", ret, jeb->offset)); + if (ret || ops.oobretlen != ops.ooblen) { + printk(KERN_ERR "cannot read OOB for EB at %08x, requested %d " + "bytes, read %d bytes, error %d\n", jeb->offset, + ops.ooblen, ops.oobretlen, ret); + if (!ret) + ret = -EIO; return ret; } - if (ops.oobretlen < ops.ooblen) { - D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB " - "returned short read (%zd bytes not %d) for block " - "at %08x\n", ops.oobretlen, ops.ooblen, jeb->offset)); - return -EIO; - } - - /* Special check for first page */ - for(i = 0; i < oobsize ; i++) { - /* Yeah, we know about the cleanmarker. */ - if (mode && i >= c->fsdata_pos && - i < c->fsdata_pos + c->fsdata_len) + for(i = 0; i < ops.ooblen; i++) { + if (mode && i < cmlen) + /* Yeah, we know about the cleanmarker */ continue; if (ops.oobbuf[i] != 0xFF) { @@ -1003,111 +1008,63 @@ int jffs2_check_oob_empty(struct jffs2_sb_info *c, } } - /* we know, we are aligned :) */ - for (page = oobsize; page < ops.ooblen; page += sizeof(long)) { - long dat = *(long *)(&ops.oobbuf[page]); - if(dat != -1) - return 1; - } return 0; } /* - * Scan for a valid cleanmarker and for bad blocks + * Check for a valid cleanmarker. + * Returns: 0 if a valid cleanmarker was found + * 1 if no cleanmarker was found + * negative error code if an error occurred */ -int jffs2_check_nand_cleanmarker (struct jffs2_sb_info *c, - struct jffs2_eraseblock *jeb) +int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, + struct jffs2_eraseblock *jeb) { - struct jffs2_unknown_node n; struct mtd_oob_ops ops; - int oobsize = c->mtd->oobsize; - unsigned char *p,*b; - int i, ret; - size_t offset = jeb->offset; - - /* Check first if the block is bad. */ - if (c->mtd->block_isbad(c->mtd, offset)) { - D1 (printk(KERN_WARNING "jffs2_check_nand_cleanmarker()" - ": Bad block at %08x\n", jeb->offset)); - return 2; - } + int ret, cmlen = min_t(int, c->oobavail, OOB_CM_SIZE); - ops.ooblen = oobsize; + ops.mode = MTD_OOB_AUTO; + ops.ooblen = cmlen; ops.oobbuf = c->oobbuf; - ops.ooboffs = 0; + ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0; ops.datbuf = NULL; - ops.mode = MTD_OOB_PLACE; - ret = c->mtd->read_oob(c->mtd, offset, &ops); - if (ret) { - D1 (printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): " - "Read OOB failed %d for block at %08x\n", - ret, jeb->offset)); + ret = c->mtd->read_oob(c->mtd, jeb->offset, &ops); + if (ret || ops.oobretlen != ops.ooblen) { + printk(KERN_ERR "cannot read OOB for EB at %08x, requested %d " + "bytes, read %d bytes, error %d\n", jeb->offset, + ops.ooblen, ops.oobretlen, ret); + if (!ret) + ret = -EIO; return ret; } - if (ops.oobretlen < ops.ooblen) { - D1 (printk (KERN_WARNING "jffs2_check_nand_cleanmarker(): " - "Read OOB return short read (%zd bytes not %d) " - "for block at %08x\n", ops.oobretlen, ops.ooblen, - jeb->offset)); - return -EIO; - } - - n.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK); - n.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER); - n.totlen = cpu_to_je32 (8); - p = (unsigned char *) &n; - b = c->oobbuf + c->fsdata_pos; - - for (i = c->fsdata_len; i; i--) { - if (*b++ != *p++) - ret = 1; - } - - D1(if (ret == 1) { - printk(KERN_WARNING "jffs2_check_nand_cleanmarker(): " - "Cleanmarker node not detected in block at %08x\n", - offset); - printk(KERN_WARNING "OOB at %08zx was ", offset); - for (i=0; i < oobsize; i++) - printk("%02x ", c->oobbuf[i]); - printk("\n"); - }); - return ret; + return !!memcmp(&oob_cleanmarker, c->oobbuf, cmlen); } int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) { - struct jffs2_unknown_node n; - int ret; + int ret; struct mtd_oob_ops ops; + int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE); - n.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); - n.nodetype = cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER); - n.totlen = cpu_to_je32(8); - - ops.ooblen = c->fsdata_len; - ops.oobbuf = (uint8_t *)&n; - ops.ooboffs = c->fsdata_pos; + ops.mode = MTD_OOB_AUTO; + ops.ooblen = cmlen; + ops.oobbuf = (uint8_t *)&oob_cleanmarker; + ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0; ops.datbuf = NULL; - ops.mode = MTD_OOB_PLACE; ret = c->mtd->write_oob(c->mtd, jeb->offset, &ops); - - if (ret) { - D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): " - "Write failed for block at %08x: error %d\n", - jeb->offset, ret)); + if (ret || ops.oobretlen != ops.ooblen) { + printk(KERN_ERR "cannot write OOB for EB at %08x, requested %d " + "bytes, read %d bytes, error %d\n", jeb->offset, + ops.ooblen, ops.oobretlen, ret); + if (!ret) + ret = -EIO; return ret; } - if (ops.oobretlen != ops.ooblen) { - D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): " - "Short write for block at %08x: %zd not %d\n", - jeb->offset, ops.oobretlen, ops.ooblen)); - return -EIO; - } + return 0; } @@ -1140,41 +1097,24 @@ int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock * return 1; } -static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c) +int jffs2_nand_flash_setup(struct jffs2_sb_info *c) { struct nand_ecclayout *oinfo = c->mtd->ecclayout; - /* Do this only, if we have an oob buffer */ if (!c->mtd->oobsize) return 0; /* Cleanmarker is out-of-band, so inline size zero */ c->cleanmarker_size = 0; - /* Should we use autoplacement ? */ - if (!oinfo) { - D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n")); + if (!oinfo || oinfo->oobavail == 0) { + printk(KERN_ERR "inconsistent device description\n"); return -EINVAL; } - D1(printk(KERN_DEBUG "JFFS2 using autoplace on NAND\n")); - /* Get the position of the free bytes */ - if (!oinfo->oobfree[0].length) { - printk (KERN_WARNING "jffs2_nand_set_oobinfo(): Eeep." - " Autoplacement selected and no empty space in oob\n"); - return -ENOSPC; - } - c->fsdata_pos = oinfo->oobfree[0].offset; - c->fsdata_len = oinfo->oobfree[0].length; - if (c->fsdata_len > 8) - c->fsdata_len = 8; + D1(printk(KERN_DEBUG "JFFS2 using OOB on NAND\n")); - return 0; -} - -int jffs2_nand_flash_setup(struct jffs2_sb_info *c) -{ - int res; + c->oobavail = oinfo->oobavail; /* Initialise write buffer */ init_rwsem(&c->wbuf_sem); @@ -1185,22 +1125,13 @@ int jffs2_nand_flash_setup(struct jffs2_sb_info *c) if (!c->wbuf) return -ENOMEM; - c->oobbuf = kmalloc(NR_OOB_SCAN_PAGES * c->mtd->oobsize, GFP_KERNEL); - if (!c->oobbuf) - return -ENOMEM; - - res = jffs2_nand_set_oobinfo(c); - -#ifdef BREAKME - if (!brokenbuf) - brokenbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL); - if (!brokenbuf) { + c->oobbuf = kmalloc(NR_OOB_SCAN_PAGES * c->oobavail, GFP_KERNEL); + if (!c->oobbuf) { kfree(c->wbuf); return -ENOMEM; } - memset(brokenbuf, 0xdb, c->wbuf_pagesize); -#endif - return res; + + return 0; } void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c) |