JFFS2底层驱动的挂载

一．    Jffs2超级块的挂载

static struct file_system_typejffs2_fs_type = {

      .owner= THIS_MODULE,

      .name=          "jffs2",

      .get_sb= jffs2_get_sb,

      .kill_sb= jffs2_kill_sb,

};

 

jffs2_get_sb（）

------get_sb_mtd（）

      ------struct mtd_info *mtd;

           mtd = get_mtd_device(NULL, mtdnr);

                ------- ret = mtd_table[i]

                     return ret;

返回的mtd最后被赋值给：jffs2_sb_info *c;

                       c->mtd =sb->s_mtd;

二．MTD驱动端的挂载

static int s3c24xx_nand_probe(struct platform_device *pdev,

                          enum s3c_cpu_type cpu_type)

{

………………

s3c2410_nand_init_chip(info,nmtd, sets);

             nmtd->scan_res= nand_scan_ident(&nmtd->mtd,

                                          (sets) ? sets->nr_chips : 1);

             if(nmtd->scan_res == 0) {

                    s3c2410_nand_update_chip(info, nmtd);

                    nand_scan_tail(&nmtd->mtd);

                    s3c2410_nand_add_partition(info, nmtd,sets);

             }

……………….

}

 

 

 

 

int nand_scan_tail(struct mtd_info *mtd)

{

………………..

mtd->type = MTD_NANDFLASH;

      mtd->flags= MTD_CAP_NANDFLASH;

      mtd->erase= nand_erase;

      mtd->point= NULL;

      mtd->unpoint= NULL;

      mtd->read= nand_read;

      mtd->write= nand_write;

      mtd->read_oob= nand_read_oob;

      mtd->write_oob= nand_write_oob;

      mtd->sync= nand_sync;

      mtd->lock= NULL;

      mtd->unlock= NULL;

      mtd->suspend= nand_suspend;

      mtd->resume= nand_resume;

      mtd->block_isbad= nand_block_isbad;

      mtd->block_markbad= nand_block_markbad;

………………….

}

 

static int s3c2410_nand_add_partition(struct s3c2410_nand_info *info,

                                 struct s3c2410_nand_mtd *mtd,

                                 struct s3c2410_nand_set *set)

{

…………………..

      returnadd_mtd_device(&mtd->mtd);

…………………..

}

 

int add_mtd_device(struct mtd_info *mtd)

{

……………….

      mtd_table[i]= mtd;

……………….

}