File file-5.28-btrfs-image.dif of Package file.21098

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File file-5.28-btrfs-image.dif of Package file.21098

From 27ec95a88943d858433a492940c694bac4bc54d0 Mon Sep 17 00:00:00 2001
From: Jeff Mahoney <jeffm@jeffm.io>
Date: Thu, 20 Oct 2016 11:29:21 -0400
Subject: [PATCH] Add BTRFS Filesystem Metadata Image
Patch-mainline: Submitted to file@mx.gw.com, 20 Oct 2016

The btrfs-image in its uncompressed form contains a directly usable
superblock.  Rather than duplicate the superblock printer, split
that out and use it with both the on-disk superblock and the ones
contained within the image.

diff --git a/magic/Magdir/filesystems b/magic/Magdir/filesystems
--- a/magic/Magdir/filesystems
+++ b/magic/Magdir/filesystems
@@ -2245,20 +2245,29 @@
 >>0x10060        string          >\0             lockproto %s)
 
 # Russell Coker <russell@coker.com.au>
-0x10040		string	_BHRfS_M	BTRFS Filesystem
->0x1012b	string	>\0		label "%s",
->0x10090	lelong	x		sectorsize %d,
->0x10094	lelong	x		nodesize %d,
->0x10098	lelong	x		leafsize %d,
->0x10020	belong	x		UUID=%08x-
->0x10024	beshort	x		\b%04x-
->0x10026	beshort	x		\b%04x-
->0x10028	beshort	x		\b%04x-
->0x1002a	beshort	x		\b%04x
->0x1002c	belong	x		\b%08x,
->0x10078	lequad	x		%lld/
->0x10070	lequad	x		\b%lld bytes used,
->0x10088	lequad	x		%lld devices
+0x10040		string	_BHRfS_M
+>0x10000	use			btrfs_super_block
+0		name			btrfs_super_block
+>0x40		string	_BHRfS_M	BTRFS Filesystem
+>0x12b		string	>\0		label "%s",
+>0x90		lelong	x		sectorsize %d,
+>0x94		lelong	x		nodesize %d,
+>0x98		lelong	x		leafsize %d,
+>0x20		belong	x		UUID=%08x-
+>0x24		beshort	x		\b%04x-
+>0x26		beshort	x		\b%04x-
+>0x28		beshort	x		\b%04x-
+>0x2a		beshort	x		\b%04x
+>0x2c		belong	x		\b%08x,
+>0x78		lequad	x		%lld/
+>0x70		lequad	x		\b%lld bytes used,
+>0x88		lequad	x		%lld devices
+
+0		lequad	0xbd5c25e27295668b	BTRFS Filesystem Metadata Image
+>20		byte	1			\b, zlib compressed
+>20		byte	0			\b, uncompressed
+>>0x440		string	_BHRfS_M		\b, contains
+>>>0x400	use				btrfs_super_block
 
 # dvdisaster's .ecc
 # From: "Nelson A. de Oliveira" <naoliv@gmail.com>

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