From patchwork Tue Jul 10 16:23:40 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [2/4] MTD parts: introduce mtd_get_device_size() From: Richard Genoud X-Patchwork-Id: 170245 Message-Id: <1341937423-16516-3-git-send-email-richard.genoud@gmail.com> To: Artem Bityutskiy Cc: Richard Genoud , linux-mtd@lists.infradead.org, David Woodhouse , linux-kernel@vger.kernel.org Date: Tue, 10 Jul 2012 18:23:40 +0200 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 --- 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