[PATCH 2/2] mkfs.f2fs: make the default extensions list much more sensical

[Park Ju Hyung <qkrwngud825@gmail.com>]

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 <qkrwngud825@gmail.com>
---
 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