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Subject[PATCH 1/3] mtd: introduce function max_bad_blocks
Date
From: Jeff Westfahl <jeff.westfahl@ni.com>

If implemented, 'max_bad_blocks' returns the maximum number of bad
blocks to reserve for an MTD.

Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com>
---
drivers/mtd/mtdpart.c | 12 ++++++++++++
include/linux/mtd/mtd.h | 1 +
2 files changed, 13 insertions(+)

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index cafdb88..d252df9 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -317,6 +317,16 @@ static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
return res;
}

+static int part_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+ struct mtd_part *part = PART(mtd);
+
+ if ((len + ofs) > mtd->size)
+ return -EINVAL;
+ return part->master->_max_bad_blocks(part->master,
+ ofs + part->offset, len);
+}
+
static inline void free_partition(struct mtd_part *p)
{
kfree(p->mtd.name);
@@ -442,6 +452,8 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
slave->mtd._block_isbad = part_block_isbad;
if (master->_block_markbad)
slave->mtd._block_markbad = part_block_markbad;
+ if (master->_max_bad_blocks)
+ slave->mtd._max_bad_blocks = part_max_bad_blocks;
slave->mtd._erase = part_erase;
slave->master = master;
slave->offset = part->offset;
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index f17fa75..ba607c2 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -225,6 +225,7 @@ struct mtd_info {
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);
+ int (*_max_bad_blocks) (struct mtd_info *mtd, loff_t ofs, size_t len);
int (*_suspend) (struct mtd_info *mtd);
void (*_resume) (struct mtd_info *mtd);
void (*_reboot) (struct mtd_info *mtd);
--
2.4.0


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