From c28aae8bd381f77e66e6bac79761df7a484b054c Mon Sep 17 00:00:00 2001 From: Robert Yang Date: Fri, 2 Jan 2015 12:28:35 +0800 Subject: [PATCH] linux/syslinux: implement install_bootblock() Refer to the install_bootblock() in extlinux/main.c to make linux/syslinux.c's install_bootblock() which only supports ext2/3/4. Upstream-Status: Submitted Signed-off-by: Robert Yang Tested-by: Du Dolpher --- linux/syslinux.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/linux/syslinux.c b/linux/syslinux.c index 4e43921..93ed880 100755 --- a/linux/syslinux.c +++ b/linux/syslinux.c @@ -420,6 +420,26 @@ static int ext_file_write(ext2_file_t e2_file, const void *buf, size_t count, */ int install_bootblock(int fd, const char *device) { + struct ext2_super_block sb; + + if (xpread(fd, &sb, sizeof sb, EXT2_SUPER_OFFSET + opt.offset) != sizeof sb) { + perror("reading superblock"); + return 1; + } + + if (sb.s_magic != EXT2_SUPER_MAGIC) { + fprintf(stderr, + "no ext2/3/4 superblock found on %s\n", device); + return 1; + } + + if (xpwrite(fd, syslinux_bootsect, syslinux_bootsect_len, 0) + != (signed)syslinux_bootsect_len) { + perror("writing bootblock"); + return 1; + } + + return 0; } /* The file's block count */