[PATCH 4/4] mtd: Account for BBT blocks when a partition is being allocated

Ezequiel Garcia
2014-03-21T11:58:37Z

With the introduction of mtd_block_isreserved(), it's now possible
to fix the bad and reserved block distribution exposed by ecc_stats,
instead of accounting all the bad or reserved blocks as 'bad'.

For instance, a device with eight blocks used for the BBT in the last
partition would now show (getting ECC stats from sysfs):

$ cat /sys/class/mtd/mtd2/ecc_stats
0 0 10 0
0 0 4 0
0 0 0 8

instead of the currently wrong stats:

$ cat /sys/class/mtd/mtd2/ecc_stats
0 0 10 0
0 0 4 0
0 0 8 0

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
drivers/mtd/mtdpart.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 921e8c6..a3e3a7d 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -535,7 +535,9 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
uint64_t offs = 0;

while (offs < slave->mtd.size) {
- if (mtd_block_isbad(master, offs + slave->offset))
+ if (mtd_block_isreserved(master, offs + slave->offset))
+ slave->mtd.ecc_stats.bbtblocks++;
+ else if (mtd_block_isbad(master, offs + slave->offset))
slave->mtd.ecc_stats.badblocks++;
offs += slave->mtd.erasesize;
}
--
1.9.0