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Date:   Tue, 9 May 2023 23:50:36 -0700
From:   Eric Biggers <ebiggers@kernel.org>
To:     youling 257 <youling257@gmail.com>
Cc:     Theodore Ts'o <tytso@mit.edu>, jack@suse.cz, hch@infradead.org,
        hch@lst.de, linux-ext4@vger.kernel.org, ritesh.list@gmail.com,
        keescook@chromium.org
Subject: Re: [PATCH v4 12/13] ext4: Stop providing .writepage hook
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On Wed, May 10, 2023 at 01:47:58PM +0800, youling 257 wrote:
> I do more test, it is android esdfs or sdcardfs
> /storage/emulated/0/Android/data problem,
> "ext4: Stop providing .writepage hook" cause
> /storage/emulated/0/Android/data/com.android.gallery3d/cache/imgcache.0
> /storage/emulated/0/Android/data/com.android.gallery3d/cache/imgcache.1
> /storage/emulated/0/Android/data/com.android.gallery3d/cache/imgcache.idx
> unable read,
> 
> on linux 6.4, i use mount bind data/media on storage/emulated, chmod
> -R 0777 /data/media/0, rm
> /storage/emulated/0/Android/data/com.android.gallery3d/cache/*, open
> gallery app can read pictures thumbnail,
> /storage/emulated/0/Android/data/com.android.gallery3d/cache/imgcache.idx
> /storage/emulated/0/Android/data/com.android.gallery3d/cache/imgcache.0
> /storage/emulated/0/Android/data/com.android.gallery3d/cache/imgcache.1
> available read.

Maybe try reverting your commit that added esdfs to your kernel?  It should not
be needed at all.

- Eric