From 07fb737fb60c08eaaa41989d531fc23009523546 Mon Sep 17 00:00:00 2001
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From: Robert Yang <liezhi.yang@windriver.com>
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Date: Wed, 31 Dec 2014 16:09:18 +0800
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Subject: [PATCH 2/9] linux/syslinux: implement open_ext2_fs()
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The open_ext2_fs() checks whether it is an ext2/ext3/ext4 device, and
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return:
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0: It is an ext2, ext3 or ext4.
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1: Not an ext2, ext3 or ext4.
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-1: unexpected error.
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Upstream-Status: Submitted
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Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
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Tested-by: Du Dolpher <dolpher.du@intel.com>
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---
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linux/Makefile | 2 +-
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linux/syslinux.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 81 insertions(+), 1 deletion(-)
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diff --git a/linux/Makefile b/linux/Makefile
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index 11667e1..ac1ac58 100644
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--- a/linux/Makefile
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+++ b/linux/Makefile
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@@ -51,7 +51,7 @@ spotless: clean
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installer: syslinux syslinux-nomtools
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syslinux: $(OBJS)
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- $(CC) $(LDFLAGS) -o $@ $^
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+ $(CC) $(LDFLAGS) -o $@ $^ -lext2fs
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syslinux-nomtools: syslinux
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ln -f $< $@
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diff --git a/linux/syslinux.c b/linux/syslinux.c
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index 36fc202..cc4e7da 100755
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--- a/linux/syslinux.c
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+++ b/linux/syslinux.c
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@@ -72,6 +72,7 @@
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#include "syslxfs.h"
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#include "setadv.h"
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#include "syslxopt.h" /* unified options */
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+#include <ext2fs/ext2fs.h>
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extern const char *program; /* Name of program */
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@@ -82,6 +83,9 @@ char *mntpath = NULL; /* Path on which to mount */
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int loop_fd = -1; /* Loop device */
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#endif
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+ext2_filsys e2fs = NULL; /* Ext2/3/4 filesystem */
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+ext2_ino_t root, cwd; /* The root and cwd of e2fs */
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+
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void __attribute__ ((noreturn)) die(const char *msg)
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{
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fprintf(stderr, "%s: %s\n", program, msg);
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@@ -266,6 +270,82 @@ int do_open_file(char *name)
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*/
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static int open_ext2_fs(const char *device, const char *subdir)
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{
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+ int retval;
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+ int open_flag = EXT2_FLAG_RW, mount_flags;
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+ ext2_ino_t dirino;
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+ char opt_string[40];
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+
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+ if (opt.offset) {
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+ sprintf(opt_string, "offset=%llu", (unsigned long long)opt.offset);
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+ retval = ext2fs_open2(device, opt_string, open_flag, 0, 0, unix_io_manager, &e2fs);
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+ } else
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+ retval = ext2fs_open(device, open_flag, 0, 0, unix_io_manager, &e2fs);
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+ if (retval) {
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+ /* It might not be an extN fs, so we need check magic firstly */
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+ if (retval == EXT2_ET_BAD_MAGIC) {
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+ /* Do nothing, return silently */
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+ return 1;
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+ } else {
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+ fprintf(stderr, "%s: error while trying to open: %s\n",
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+ program, device);
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+ return -1;
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+ }
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+ }
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+
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+ /* Stop if it is mounted */
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+ retval = ext2fs_check_if_mounted(device, &mount_flags);
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+ if (retval) {
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+ fprintf(stderr, "%s: ext2fs_check_if_mount() error on %s\n",
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+ program, device);
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+ goto fail;
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+ }
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+
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+ if (mount_flags & EXT2_MF_MOUNTED) {
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+ fprintf(stderr, "%s: %s is mounted\n", program, device);
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+ goto fail;
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+ }
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+
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+ e2fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
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+
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+ /* Read the inode map */
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+ retval = ext2fs_read_inode_bitmap(e2fs);
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+ if (retval) {
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+ fprintf(stderr, "%s: while reading inode bitmap: %s\n",
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+ program, device);
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+ goto fail;
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+ }
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+
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+ /* Read the block map */
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+ retval = ext2fs_read_block_bitmap(e2fs);
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+ if (retval) {
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+ fprintf(stderr, "%s: while reading block bitmap: %s\n",
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+ program, device);
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+ goto fail;
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+ }
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+
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+ root = cwd = EXT2_ROOT_INO;
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+ /* Check the subdir */
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+ if (strcmp(subdir, "/")) {
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+ retval = ext2fs_namei(e2fs, root, cwd, subdir, &dirino);
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+ if (retval) {
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+ fprintf(stderr, "%s: failed to find dir %s on %s\n",
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+ program, subdir, device);
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+ goto fail;
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+ }
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+
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+ retval = ext2fs_check_directory(e2fs, dirino);
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+ if (retval) {
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+ fprintf(stderr, "%s: failed to cd to: %s\n", program, subdir);
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+ goto fail;
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+ }
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+ cwd = dirino;
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+ }
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+
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+ return 0;
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+
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+fail:
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+ (void) ext2fs_close(e2fs);
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+ return -1;
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}
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/* The install func for ext2, ext3 and ext4 */
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--
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1.9.1
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