list ext2 data blocks from a filesystem and file path through it's inode, using two methods

list-blocks-from-file-through-inode.c

// gcc -l ext2fs % -pg && ./a.out dummy.ext2 a/4

#include <ext2fs/ext2fs.h>
#include <stdio.h>

int blk_iterate(ext2_filsys fs, blk_t *blocknr, int blockcnt, void *priv_data)
{
        printf("blk(%d)=%d\n", blockcnt, *blocknr);
        return 0;
}

void do_block_iterate(ext2_filsys fs, ext2_ino_t ino)
{
        printf("block_iterate\n");
        ext2fs_block_iterate(fs, ino, 0, 0, blk_iterate, 0);
}

void do_bmap(ext2_filsys fs, ext2_ino_t ino)
{
        printf("bmap\n");
        blk_t           blk=0, pblk=-1;
        while((ext2fs_bmap(fs, ino, 0, 0, 0, blk, &pblk) == 0) && pblk) {
                printf("blk(%d)=%d\n", blk, pblk);
                ++blk;
        }
}

int main(int argc, char *argv[])
{
        if(argc<2)
                return 1;

        char * fs_path = argv[1];
        char * file_path = argv[2];

        ext2_filsys fs = NULL;
        ext2fs_open(fs_path, 0, 0, 0, unix_io_manager, &fs);
        //ext2fs_read_bitmaps(fs);

        ext2_ino_t      ino;
        ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, file_path, &ino);
        printf("ino=%d\n",ino);

        #if 0
        struct ext2_inode ei;
        ext2fs_read_inode(fs, ino, &ei);
        uint nblk = ext2fs_inode_data_blocks(fs, &ei);
        printf("nblk=%d\n",nblk);
        #endif

        do_bmap(fs, ino);

        do_block_iterate(fs, ino);

        return 0;
}