Re: [PATCH 01/13] ext4: refuse encryption when block size > page size

[sashiko-bot@kernel.org]

> From: Alberto Garcia <berto@igalia.com>
> 
> Encryption is not supported when a filesystem's block size is larger
> than the page size, and commit 709f0f1f1bf5 ("ext4: add checks for
> large folio incompatibilities when BS > PS") added a check to refuse
> mounting such a filesystem.
> 
> However, it is also possible to enable the "encrypt" feature on a
> filesystem that is already mounted (with tune2fs -O encrypt). Once
> that happens it won't be possible to mount the filesystem again in
> the future, but there is nothing preventing the user from setting an
> encryption policy while the filesystem is still mounted.
> 
> Fix this by refusing to set an fscrypt context in ext4_set_context()
> when the block size is larger than the page size.
> 
> Fixes: 709f0f1f1bf5 ("ext4: add checks for large folio incompatibilities when BS > PS")
> Cc: stable@vger.kernel.org # v6.19+
> Signed-off-by: Alberto Garcia <berto@igalia.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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