[PATCH v2 1/3] mtd: introduce function max_bad_blocks

[Zach Brown]

From: Jeff Westfahl <jeff.westf...@ni.com>

If implemented, 'max_bad_blocks' returns the maximum number of bad
blocks to reserve for an MTD. An implementation for NAND is coming soon.

Signed-off-by: Jeff Westfahl <jeff.westf...@ni.com>
Signed-off-by: Zach Brown <zach.br...@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 c1f34f0..65d3563 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -350,6 +350,16 @@ static const struct mtd_ooblayout_ops part_ooblayout_ops = 
{
        .free = part_ooblayout_free,
 };
 
+static int part_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+       struct mtd_part *part = mtd_to_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);
@@ -482,6 +492,8 @@ static struct mtd_part *allocate_partition(struct mtd_info 
*master,
        if (master->_put_device)
                slave->mtd._put_device = part_put_device;
 
+       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 13f8052..bd277eb 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -322,6 +322,7 @@ 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);
-- 
2.7.4