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Subject[PATCH 2/4] MTD parts: introduce mtd_get_device_size()
Date
mtd_get_device_size() returns the size of the whole MTD device, that is
the mtd_info master size.
This is used by UBI to calculate the maximum number of bad blocks (MBB)
on a MTD device.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
---
drivers/mtd/mtdpart.c | 14 ++++++++++++++
include/linux/mtd/partitions.h | 1 +
2 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 8500584..d12f583 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -760,3 +760,17 @@ int mtd_is_partition(const struct mtd_info *mtd)
return ispart;
}
EXPORT_SYMBOL_GPL(mtd_is_partition);
+
+/* returns the size of an MTD device */
+uint64_t mtd_get_device_size(const struct mtd_info *mtd)
+{
+ struct mtd_part *part;
+
+ if (!mtd_is_partition(mtd))
+ return mtd->size;
+
+ part = PART(mtd);
+
+ return part->master->size;
+}
+EXPORT_SYMBOL_GPL(mtd_get_device_size);
diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
index 02a5115..1f8d24b 100644
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -83,5 +83,6 @@ int mtd_is_partition(const struct mtd_info *mtd);
int mtd_add_partition(struct mtd_info *master, char *name,
long long offset, long long length);
int mtd_del_partition(struct mtd_info *master, int partno);
+uint64_t mtd_get_device_size(const struct mtd_info *mtd);

#endif
--
1.7.2.5


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