code:badblock - ikarishinjieva/unixV6-code-analyze-chs GitHub Wiki

7030

7031 /*

7032  * Check that a block number is in the

7033  * range between the I list and the size

7034  * of the device.

7035  * This is used mainly to check that a

7036  * garbage file system has not been mounted.

7037  *

7038  * bad block on dev x/y -- not in range

7039  */

7040 badblock(afp, abn, dev)

7041 {

7042     register struct filsys *fp;

7043     register char *bn;

7044

7045     fp = afp;

7046     bn = abn;

7047     if (bn < fp->s_isize+2 || bn >= fp->s_fsize) {

7048          prdev("bad block", dev);

7049          return(1);

7050     }

• 若指定盘块不是一般盘块，例如是超级块或INODE块或越界，则
  • 输出错误信息
  • 函数返回1

7051     return(0);

7052 }

7053 /* ------------------------- */

7054 /* ------------------------- */

• 文件系统

• code:alloc
• code:free