[PATCH 15/16] f2fs: ensure only power of 2 zone sizes are allowed

[Pankaj Raghav]

From: Luis Chamberlain <mcgrof at kernel.org>

F2FS zoned support has power of 2 zone size assumption in many places
such as in __f2fs_issue_discard_zone, init_blkz_info. As the power of 2
requirement has been removed from the block layer, explicitly add a
condition in f2fs to allow only power of 2 zone size devices.

This condition will be relaxed once those calculation based on power of
2 is made generic.

Signed-off-by: Luis Chamberlain <mcgrof at kernel.org>
Signed-off-by: Pankaj Raghav <p.raghav at samsung.com>
---
 fs/f2fs/super.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f64761a15df7..db79abf30002 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3685,6 +3685,10 @@ static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
 		return 0;
 
 	zone_sectors = bdev_zone_sectors(bdev);
+	if (!is_power_of_2(zone_sectors)) {
+		f2fs_err(sbi, "F2FS does not support non power of 2 zone sizes\n");
+		return -EINVAL;
+	}
 
 	if (sbi->blocks_per_blkz && sbi->blocks_per_blkz !=
 				SECTOR_TO_BLOCK(zone_sectors))
-- 
2.25.1