linux-kernel - Subject: [PATCH 15/16] Squashfs: initrd support

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Message-Id: <E1KqrTX-0001yI-SL@dylan>
Date:	Fri, 17 Oct 2008 16:42:51 +0100
From:	Phillip Lougher <phillip@...gher.demon.co.uk>
To:	akpm@...ux-foundation.org, linux-embedded@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	tim.bird@...sony.com
Subject: Subject: [PATCH 15/16] Squashfs: initrd support


Signed-off-by: Phillip Lougher <phillip@...gher.demon.co.uk>
---
 init/do_mounts_rd.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index fedef93..30086a7 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -5,6 +5,7 @@
 #include <linux/ext2_fs.h>
 #include <linux/romfs_fs.h>
 #include <linux/cramfs_fs.h>
+#include <linux/squashfs_fs.h>
 #include <linux/initrd.h>
 #include <linux/string.h>
 
@@ -41,6 +42,7 @@ static int __init crd_load(int in_fd, int out_fd);
  * 	ext2
  *	romfs
  *	cramfs
+ *	squashfs
  * 	gzip
  */
 static int __init 
@@ -51,6 +53,7 @@ identify_ramdisk_image(int fd, int start_block)
 	struct ext2_super_block *ext2sb;
 	struct romfs_super_block *romfsb;
 	struct cramfs_super *cramfsb;
+	struct squashfs_super_block *squashfsb;
 	int nblocks = -1;
 	unsigned char *buf;
 
@@ -62,6 +65,7 @@ identify_ramdisk_image(int fd, int start_block)
 	ext2sb = (struct ext2_super_block *) buf;
 	romfsb = (struct romfs_super_block *) buf;
 	cramfsb = (struct cramfs_super *) buf;
+	squashfsb = (struct squashfs_super_block *) buf;
 	memset(buf, 0xe5, size);
 
 	/*
@@ -99,6 +103,16 @@ identify_ramdisk_image(int fd, int start_block)
 		goto done;
 	}
 
+	/* squashfs is at block zero too */
+	if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
+		printk(KERN_NOTICE
+		       "RAMDISK: squashfs filesystem found at block %d\n",
+		       start_block);
+		nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
+			 >> BLOCK_SIZE_BITS;
+		goto done;
+	}
+
 	/*
 	 * Read block 1 to test for minix and ext2 superblock
 	 */
-- 
1.5.2.5

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