Re: [PATCH] fsverity: add dependency on 64K or smaller pages

[Eric Biggers <ebiggers@kernel.org>]

On Sat, Feb 21, 2026 at 12:45:25PM -0800, Eric Biggers wrote:
> Currently, all filesystems that support fsverity (ext4, f2fs, and btrfs)
> cache the Merkle tree in the pagecache at a 64K aligned offset after the
> end of the file data.  This offset needs to be a multiple of the page
> size, which is guaranteed only when the page size is 64K or smaller.
> 
> 64K was chosen to be the "largest reasonable page size".  But it isn't
> the largest *possible* page size: the hexagon and powerpc ports of Linux
> support 256K pages, though that configuration is rarely used.
> 
> For now, just disable support for FS_VERITY in these odd configurations
> to ensure it isn't used in cases where it would have incorrect behavior.
> 
> Fixes: 671e67b47e9f ("fs-verity: add Kconfig and the helper functions for hashing")
> Reported-by: Christoph Hellwig <hch@lst.de>
> Closes: https://lore.kernel.org/r/20260119063349.GA643@lst.de
> Signed-off-by: Eric Biggers <ebiggers@kernel.org>
> ---
>  fs/verity/Kconfig | 3 +++
>  1 file changed, 3 insertions(+)

Applied to https://git.kernel.org/pub/scm/fs/fsverity/linux.git/log/?h=for-current

- Eric