Re: [PATCH 1/3] ext4: Add alignment check for DAX mount

diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 304c712..90a8670 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3421,6 +3421,12 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) "error: unsupported blocksize for dax"); goto failed_mount; } + if (sb->s_bdev->bd_part->start_sect % (PAGE_SIZE / 512) || + sb->s_bdev->bd_part->nr_sects % (PAGE_SIZE / 512)) { + ext4_msg(sb, KERN_ERR, + "error: unaligned partition for dax"); + goto failed_mount; + } if (!sb->s_bdev->bd_disk->fops->direct_access) { ext4_msg(sb, KERN_ERR, "error: device does not support dax");