lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 27 Oct 2016 14:14:01 -0500 From: Zach Brown <zach.brown@...com> To: <dwmw2@...radead.org> CC: <computersforpeace@...il.com>, <boris.brezillon@...e-electrons.com>, <richard@....at>, <dedekind1@...il.com>, <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org> Subject: [RESEND PATCH v2 2/3] mtd: nand: implement 'max_bad_blocks' mtd function From: Jeff Westfahl <jeff.westfahl@...com> Implement the new mtd function 'max_bad_blocks'. Use the ONFI parameter page to find the maximum bad blocks to reserve for an MTD, taking into account how many LUNs the MTD spans. Signed-off-by: Jeff Westfahl <jeff.westfahl@...com> Signed-off-by: Zach Brown <zach.brown@...com> --- drivers/mtd/nand/nand_base.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index e5718e5..ac08224 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3226,6 +3226,39 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs) } /** + * nand_max_bad_blocks - [MTD Interface] Max number of bad blocks for an mtd + * @mtd: MTD device structure + * @ofs: offset relative to mtd start + * @len: length of mtd + */ +static int nand_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + uint32_t part_start_block; + uint32_t part_end_block; + uint32_t part_start_lun; + uint32_t part_end_lun; + + /* ONFI is used to determine the maximum bad block count. */ + if (!chip->onfi_version) + return -ENOTSUPP; + + /* Get the start and end of the partition in erase blocks. */ + part_start_block = mtd_div_by_eb(ofs, mtd); + part_end_block = mtd_div_by_eb(len, mtd) + part_start_block - 1; + + /* Get the start and end LUNs of the partition. */ + part_start_lun = part_start_block / chip->onfi_params.blocks_per_lun; + part_end_lun = part_end_block / chip->onfi_params.blocks_per_lun; + + /* Look up the bad blocks per unit and multiply by the number of units + * that the partition spans. + */ + return chip->onfi_params.bb_per_lun * + (part_end_lun - part_start_lun + 1); +} + +/** * nand_onfi_set_features- [REPLACEABLE] set features for ONFI nand * @mtd: MTD device structure * @chip: nand chip info structure @@ -4743,6 +4776,7 @@ int nand_scan_tail(struct mtd_info *mtd) mtd->_block_isreserved = nand_block_isreserved; mtd->_block_isbad = nand_block_isbad; mtd->_block_markbad = nand_block_markbad; + mtd->_max_bad_blocks = nand_max_bad_blocks; mtd->writebufsize = mtd->writesize; /* -- 2.7.4
Powered by blists - more mailing lists