Hi Jaegeuk, Chao.

This is a revival from a patchset I sent about a year ago.

The original patchset's list was about 50 entries and we talked about
leaving too small room for the users to customize.
I made much more conservative choices here to made the new one to be
36(from 34), while still being very practical and relevant on both
regular Linux distros and Android.
I hope the explanation written in the commit message is enough to persuade you.

Thanks.


On Tue, Apr 16, 2019 at 3:44 PM Park Ju Hyung <[email protected]> wrote:
>
> Following extensions are removed:
>  - divx: deprecated video format and it's usually wrapped with avi
>  - asf: deprecated streaming format
>  - asx: redirecting file to asf(small)
>  - wmx: redirecting file to wma/wmv(small)
>  - rm: deprecated media container
>  - video: unused
>  - wv: unpopular audio format from 1998
>
> The extensions list is limited to 64 and those don't deserve to be
> on this space-precious list.
>
> Common prefixes are introduced and are checked with
> https://en.wikipedia.org/wiki/List_of_filename_extensions
> to avoid treating possible hot files as cold:
>  - mp: covers mp3, mp4, mpeg, mpg
>  - wm: covers wma, wmb, wmv
>  - og: covers oga, ogg, ogm, ogv
>  - jp: covers jpg, jpeg, jp2
>
> Following extensions are added:
>  - webm: extremely popular free media container format from Google
>          VP8/VP9/AV1 and Vorbis/Opus is often wrapped with this container
>  - wav: uncompressed audio format, commonly used with voice recorders
>  - svg: vector image format commonly used in web
>  - webp: free lossy image format commonly used in web
>  - jar: Java archive file
>  - deb: Debian software package
>  - iso: disk image file
>  - gz: gzip compressed file, unable to randomly update
>  - xz: xz compressed file, unable to randomly update
>  - zst: zstd compressed file, unable to randomly update
>  - pdf: PDF document
>  - pyc: Python bytecode automatically generated when
>         executing python to run .py files
>  - ttc, ttf: font files
>  - cnt: image alias files commonly used in Android apps
>  - exo: EXO player's cache files, commonly used in Android's YouTube app
>  - odex, vdex: Android RunTime files found in /data/app/*/oat
>
> Total entries on the list changed from 34 to 36.
>
> Signed-off-by: Park Ju Hyung <[email protected]>
> ---
>  mkfs/f2fs_format.c | 50 ++++++++++++++++++++++++++--------------------
>  1 file changed, 28 insertions(+), 22 deletions(-)
>
> diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
> index 0ae0df3..4560611 100644
> --- a/mkfs/f2fs_format.c
> +++ b/mkfs/f2fs_format.c
> @@ -38,48 +38,54 @@ struct f2fs_checkpoint *cp;
>  static unsigned int quotatype_bits = 0;
>
>  const char *media_ext_lists[] = {
> +       /* common prefix */
> +       "mp", // Covers mp3, mp4, mpeg, mpg
> +       "wm", // Covers wma, wmb, wmv
> +       "og", // Covers oga, ogg, ogm, ogv
> +       "jp", // Covers jpg, jpeg, jp2
> +
>         /* video */
>         "avi",
> -       "divx",
>         "m4v",
>         "m4p",
> -       "mp4",
> -       "wmv",
> -       "mpeg",
>         "mkv",
>         "mov",
> -       "asx",
> -       "asf",
> -       "wmx",
> -       "svi",
> -       "wvx",
> -       "wm",
> -       "mpg",
> -       "mpe",
> -       "rm",
> -       "video",
> +       "webm",
>
>         /* audio */
> +       "wav",
>         "m4a",
> -       "mp3",
>         "3gp",
> -       "wma",
> -       "wv",
> -       "ogg",
>         "opus",
>         "flac",
>
>         /* image */
> -       "jpeg",
> -       "jpg",
>         "gif",
>         "png",
> -
> -       /* other */
> +       "svg",
> +       "webp",
> +
> +       /* archives */
> +       "jar",
> +       "deb",
> +       "iso",
> +       "gz",
> +       "xz",
> +       "zst",
> +
> +       /* others */
> +       "pdf",
> +       "pyc", // Python bytecode
> +       "ttc",
> +       "ttf",
>         "exe",
>
>         /* android */
>         "apk",
> +       "cnt", // Image alias
> +       "exo", // YouTube
> +       "odex", // Android RunTime
> +       "vdex", // Android RunTime
>         "so",
>
>         NULL
> --
> 2.21.0
>


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