From: Neil Armstrong <narmstrong@neotion.com>
Date: Wed, 2 Nov 2011 20:37:47 +0000 (-0700)
Subject: init/do_mounts_rd.c: fix ramdisk identification for padded cramfs
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f919b9235f930e649b374a50009c6c268bd9a073;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

init/do_mounts_rd.c: fix ramdisk identification for padded cramfs

When a cramfs ramdisk padded with 512 bytes is given to the kernel, the
current identify_ramdisk_image function fails to identify it.

Tested with a padded cramfs image on an ARM based board.

Signed-off-by: Neil Armstrong <narmstrong@neotion.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Davidlohr Bueso <dave@gnu.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index fe9acb0ae48..887629e24c5 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -119,6 +119,20 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
 		goto done;
 	}
 
+	/*
+	 * Read 512 bytes further to check if cramfs is padded
+	 */
+	sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
+	sys_read(fd, buf, size);
+
+	if (cramfsb->magic == CRAMFS_MAGIC) {
+		printk(KERN_NOTICE
+		       "RAMDISK: cramfs filesystem found at block %d\n",
+		       start_block);
+		nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
+		goto done;
+	}
+
 	/*
 	 * Read block 1 to test for minix and ext2 superblock
 	 */