From 86a720aafce5b2571af66b8d7e04b144c05b1b8b Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Wed, 21 May 2014 19:06:12 -0300 Subject: [PATCH] mtd: Introduce mtd_block_isreserved() In addition to mtd_block_isbad(), which checks if a block is bad or reserved, it's needed to check if a block is reserved only (but not bad). This commit adds an MTD interface for it, in a similar fashion to mtd_block_isbad(). While here, fix mtd_block_isbad() so the out-of-bounds checking is done before the callback check. Signed-off-by: Ezequiel Garcia Tested-by: Pekon Gupta Signed-off-by: Brian Norris [scottwood: Cherry-picked from Linux 8471bb73ba10ed67] Signed-off-by: Scott Wood --- drivers/mtd/mtdcore.c | 14 ++++++++++++-- drivers/mtd/mtdpart.c | 9 +++++++++ drivers/mtd/nand/nand_base.c | 18 ++++++++++++++++++ drivers/mtd/nand/nand_bbt.c | 14 ++++++++++++++ include/linux/mtd/mtd.h | 2 ++ include/linux/mtd/nand.h | 1 + 6 files changed, 56 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index cb27ff22be..2f2172b987 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -1125,12 +1125,22 @@ int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) } EXPORT_SYMBOL_GPL(mtd_is_locked); -int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) +int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs) { - if (!mtd->_block_isbad) + if (ofs < 0 || ofs > mtd->size) + return -EINVAL; + if (!mtd->_block_isreserved) return 0; + return mtd->_block_isreserved(mtd, ofs); +} +EXPORT_SYMBOL_GPL(mtd_block_isreserved); + +int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) +{ if (ofs < 0 || ofs > mtd->size) return -EINVAL; + if (!mtd->_block_isbad) + return 0; return mtd->_block_isbad(mtd, ofs); } EXPORT_SYMBOL_GPL(mtd_block_isbad); diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index cfbaa3d9a0..cddfb1609c 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -321,6 +321,13 @@ static void part_resume(struct mtd_info *mtd) } #endif +static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs) +{ + struct mtd_part *part = PART(mtd); + ofs += part->offset; + return part->master->_block_isreserved(part->master, ofs); +} + static int part_block_isbad(struct mtd_info *mtd, loff_t ofs) { struct mtd_part *part = PART(mtd); @@ -459,6 +466,8 @@ static struct mtd_part *allocate_partition(struct mtd_info *master, slave->mtd._unlock = part_unlock; if (master->_is_locked) slave->mtd._is_locked = part_is_locked; + if (master->_block_isreserved) + slave->mtd._block_isreserved = part_block_isreserved; if (master->_block_isbad) slave->mtd._block_isbad = part_block_isbad; if (master->_block_markbad) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index a488722ea6..bf4caa81eb 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -524,6 +524,23 @@ static int nand_check_wp(struct mtd_info *mtd) return (chip->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1; } +/** + * nand_block_checkbad - [GENERIC] Check if a block is marked bad + * @mtd: MTD device structure + * @ofs: offset from device start + * + * Check if the block is mark as reserved. + */ +static int nand_block_isreserved(struct mtd_info *mtd, loff_t ofs) +{ + struct nand_chip *chip = mtd->priv; + + if (!chip->bbt) + return 0; + /* Return info from the table */ + return nand_isreserved_bbt(mtd, ofs); +} + /** * nand_block_checkbad - [GENERIC] Check if a block is marked bad * @mtd: MTD device structure @@ -3883,6 +3900,7 @@ int nand_scan_tail(struct mtd_info *mtd) mtd->_sync = nand_sync; mtd->_lock = NULL; mtd->_unlock = NULL; + mtd->_block_isreserved = nand_block_isreserved; mtd->_block_isbad = nand_block_isbad; mtd->_block_markbad = nand_block_markbad; mtd->writebufsize = mtd->writesize; diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c index 18c32af9aa..34b8ddcbcb 100644 --- a/drivers/mtd/nand/nand_bbt.c +++ b/drivers/mtd/nand/nand_bbt.c @@ -1304,6 +1304,20 @@ int nand_default_bbt(struct mtd_info *mtd) return nand_scan_bbt(mtd, this->badblock_pattern); } +/** + * nand_isreserved_bbt - [NAND Interface] Check if a block is reserved + * @mtd: MTD device structure + * @offs: offset in the device + */ +int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs) +{ + struct nand_chip *this = mtd->priv; + int block; + + block = (int)(offs >> this->bbt_erase_shift); + return bbt_get_entry(this, block) == BBT_BLOCK_RESERVED; +} + /** * nand_isbad_bbt - [NAND Interface] Check if a block is bad * @mtd: MTD device structure diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 552d4d623f..cf5cda15d1 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -238,6 +238,7 @@ struct mtd_info { int (*_lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len); int (*_unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len); int (*_is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len); + int (*_block_isreserved) (struct mtd_info *mtd, loff_t ofs); int (*_block_isbad) (struct mtd_info *mtd, loff_t ofs); int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs); #ifndef __UBOOT__ @@ -328,6 +329,7 @@ static inline void mtd_sync(struct mtd_info *mtd) int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len); int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len); int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len); +int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs); int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs); int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs); diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 9dfba35046..7c07087394 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -830,6 +830,7 @@ extern struct nand_manufacturers nand_manuf_ids[]; extern int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd); extern int nand_default_bbt(struct mtd_info *mtd); extern int nand_markbad_bbt(struct mtd_info *mtd, loff_t offs); +extern int nand_isreserved_bbt(struct mtd_info *mtd, loff_t offs); extern int nand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt); extern int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr, int allowbbt); -- 2.39.5