lkml.org 
[lkml]   [2022]   [Apr]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 16/16] dm-zoned: ensure only power of 2 zone sizes are allowed
Date
From: Luis Chamberlain <mcgrof@kernel.org>

Today dm-zoned relies on the assumption that you have a zone size
with a power of 2. Even though the block layer today enforces this
requirement, these devices do exist and so provide a stop-gap measure
to ensure these devices cannot be used by mistake

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
---
drivers/md/dm-zone.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/drivers/md/dm-zone.c b/drivers/md/dm-zone.c
index 57daa86c19cf..221e0aa0f1a7 100644
--- a/drivers/md/dm-zone.c
+++ b/drivers/md/dm-zone.c
@@ -231,6 +231,18 @@ static int dm_revalidate_zones(struct mapped_device *md, struct dm_table *t)
struct request_queue *q = md->queue;
unsigned int noio_flag;
int ret;
+ struct block_device *bdev = md->disk->part0;
+ sector_t zone_sectors;
+ char bname[BDEVNAME_SIZE];
+
+ zone_sectors = bdev_zone_sectors(bdev);
+
+ if (!is_power_of_2(zone_sectors)) {
+ DMWARN("%s: %s only power of two zone size supported\n",
+ dm_device_name(md),
+ bdevname(bdev, bname));
+ return 1;
+ }

/*
* Check if something changed. If yes, cleanup the current resources
--
2.25.1
\
 
 \ /
  Last update: 2022-04-27 18:07    [W:0.358 / U:0.928 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site