syslinux: support ext2/3/4 device

* Support ext2/3/4 deivce.
* The open_ext2_fs() checks whether it is an ext2/3/4 device,
  do the ext2/3/4 installation (install_to_ext2()) if yes, otherwise go
  on to the fat/ntfs.
* The ext2/3/4 support doesn't require root privileges since it doesn't need
  mount (but write permission is required).

Next:
* Get rid of fat filesystem from the boot image.

These patches have been sent to upstream, we may adjust them (maybe put
the extX support to syslinux-mtools), I will go on working with the
upstream.

(From OE-Core rev: d5af8539c0a1718a7254bcdcfa973e3c887dfbd6)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 84 insertions, 0 deletions

diff --git a/meta/recipes-devtools/syslinux/syslinux/0007-linux-syslinux-implement-ext_construct_sectmap_fs.patch b/meta/recipes-devtools/syslinux/syslinux/0007-linux-syslinux-implement-ext_construct_sectmap_fs.patch
new file mode 100644
index 0000000000..3913811917
--- /dev/null
+++ b/meta/recipes-devtools/syslinux/syslinux/0007-linux-syslinux-implement-ext_construct_sectmap_fs.patch
@@ -0,0 +1,84 @@
+From a95b831e18dd123f859bc5e6c4cecdcc0184ee37 Mon Sep 17 00:00:00 2001
+From: Robert Yang <liezhi.yang@windriver.com>
+Date: Fri, 2 Jan 2015 12:18:02 +0800
+Subject: [PATCH 7/9] linux/syslinux: implement ext_construct_sectmap_fs()
+
+The ext_construct_sectmap_fs() constucts the sector according to the
+bmap.
+
+Upstream-Status: Submitted
+
+Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
+Tested-by: Du Dolpher <dolpher.du@intel.com>
+---
+ linux/syslinux.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 50 insertions(+)
+
+diff --git a/linux/syslinux.c b/linux/syslinux.c
+index f0c97a8..c741750 100755
+--- a/linux/syslinux.c
++++ b/linux/syslinux.c
+@@ -421,10 +421,60 @@ int install_bootblock(int fd, const char *device)
+ {
+ }
+ 
++/* The file's block count */
++int block_count = 0;
++static int get_block_count(ext2_filsys fs EXT2FS_ATTR((unused)),
++                            blk64_t *blocknr EXT2FS_ATTR((unused)),
++                            e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
++                            blk64_t ref_block EXT2FS_ATTR((unused)),
++                            int ref_offset EXT2FS_ATTR((unused)),
++                            void *private EXT2FS_ATTR((unused)))
++{
++    block_count++;
++    return 0;
++}
++
+ /* Construct the boot file map */
+ int ext_construct_sectmap_fs(ext2_filsys fs, ext2_ino_t newino,
+                                 sector_t *sectors, int nsect)
+ {
++    blk64_t             pblk, blksize, blk = 0;
++    sector_t            sec;
++    unsigned int        i;
++    int                 retval;
++
++    blksize = fs->blocksize;
++    blksize >>= SECTOR_SHIFT;
++
++    /* Get the total blocks no. */
++    retval = ext2fs_block_iterate3(fs, newino, BLOCK_FLAG_READ_ONLY,
++            NULL, get_block_count, NULL);
++    if (retval) {
++        fprintf(stderr, "%s: ERROR: ext2fs_block_iterate3() failed.\n", program);
++        return -1;
++    }
++
++    while (nsect) {
++        if (block_count-- == 0)
++            break;
++
++        /* Get the physical block no. (bmap) */
++        retval = ext2fs_bmap2(fs, newino, 0, 0, 0, blk, 0, &pblk);
++        if (retval) {
++            fprintf(stderr, "%s: ERROR: ext2fs_bmap2() failed.\n", program);
++            return -1;
++        }
++
++        blk++;
++        sec = (sector_t)pblk * blksize;
++        for (i = 0; i < blksize; i++) {
++            *sectors++ = sec++;
++            if (! --nsect)
++                break;
++        }
++    }
++
++    return 0;
+ }
+ 
+ static int handle_adv_on_ext(void)
+-- 
+1.9.1
+