linux-ext4 - Re: don't use ->bd_inode to access the block device size

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Message-ID: <e3d2f358-be1a-3413-fdb8-2e86718cde3e@youngman.org.uk>
Date:   Thu, 14 Oct 2021 16:35:49 +0100
From:   Wol <antlists@...ngman.org.uk>
To:     Kees Cook <keescook@...omium.org>,
        Dave Kleikamp <dave.kleikamp@...cle.com>
Cc:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "drbd-dev@...ts.linbit.com" <drbd-dev@...ts.linbit.com>,
        "linux-bcache@...r.kernel.org" <linux-bcache@...r.kernel.org>,
        "linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "jfs-discussion@...ts.sourceforge.net" 
        <jfs-discussion@...ts.sourceforge.net>,
        "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
        "linux-nilfs@...r.kernel.org" <linux-nilfs@...r.kernel.org>,
        "linux-ntfs-dev@...ts.sourceforge.net" 
        <linux-ntfs-dev@...ts.sourceforge.net>,
        "ntfs3@...ts.linux.dev" <ntfs3@...ts.linux.dev>,
        "reiserfs-devel@...r.kernel.org" <reiserfs-devel@...r.kernel.org>
Subject: Re: don't use ->bd_inode to access the block device size

On 14/10/2021 16:14, Kees Cook wrote:
>> I don't really mind bdev_size since it's analogous to i_size, but
>> bdev_nr_bytes seems good to me.

> I much prefer bdev_nr_bytes(), as "size" has no units.

Does it mean size IN bytes, or size OF A byte? :-)

Cheers,
Wol