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	id 91D7968BEB; Mon, 11 May 2026 09:45:56 +0200 (CEST)
Date: Mon, 11 May 2026 09:45:56 +0200
From: Christoph Hellwig <hch@lst.de>
To: Anders Larsen <al@alarsen.net>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
	Christian Brauner <brauner@kernel.org>,
	Christoph Hellwig <hch@lst.de>, Jan Kara <jack@suse.cz>,
	David Sterba <dsterba@suse.com>,
	Luis de Bethencourt <luisbg@kernel.org>,
	Salah Triki <salah.triki@gmail.com>,
	"Tigran A. Aivazian" <aivazian.tigran@gmail.com>,
	Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>,
	Dave Kleikamp <shaggy@kernel.org>,
	Konstantin Komarov <almaz.alexandrovich@paragon-software.com>,
	Bob Copeland <me@bobcopeland.com>, linux-fsdevel@vger.kernel.org,
	jfs-discussion@lists.sourceforge.net, ntfs3@lists.linux.dev,
	linux-karma-devel@lists.sourceforge.net
Subject: Re: [PATCH 03/10] qnx4: handle set_blocksize failures
Message-ID: <20260511074556.GA28186@lst.de>
References: <20260511071701.2456211-1-hch@lst.de> <20260511071701.2456211-4-hch@lst.de> <12893675.O9o76ZdvQC@oscar>
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User-Agent: Mutt/1.5.17 (2007-11-01)

On Mon, May 11, 2026 at 09:42:49AM +0200, Anders Larsen wrote:
> Hi,
> 
> On 2026-05-11 09:16 Christoph Hellwig wrote:
> > qnx4 uses buffer_heads, which don't handle block size > PAGE_SIZE well.
> 
> qnx4fs uses a fixed block size of 512 bytes, so this will never happen.
> 
> > -	sb_set_blocksize(s, QNX4_BLOCK_SIZE);
> > +	if (!sb_set_blocksize(s, QNX4_BLOCK_SIZE))
> > +		return -EINVAL;
> 
> QNX4_BLOCK_SIZE is a constant (512)...

Yes, which means that sb_set_blocksize fails when the device has an LBA
size larger than 512 bytes, and this failure should be handled.