Re: [PATCH] hfsplus: limit sb_maxbytes to partition size

Christoph Hellwig
2026-03-04T13:08:17Z

On Tue, Mar 03, 2026 at 05:28:07PM +0900, Hyunchul Lee wrote:
> s_maxbytes currently is set to MAX_LFS_FILESIZE,
> which allows writes beyond the partition size.

The "partition size" does not matter here. s_maxbytes is the maximum
size supported by the format and has nothing to do with the actual space
allocated to the file system (which in Linux terminology would be the
block device and not the partition anyway).

>
> As a result,
> large-offset writes on small partitions can fail late
> with ENOSPC.

That sounds like some other check is missing in hfsplus, but it
should be about the available free space, not the device size.