Linux Certif

Toute la documentation sur la certification Linux LPI

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#include <linux/hdreg.h>        /* for HDIO_GETGEO */

#include <linux/fs.h>           /* for BLKGETSIZE and BLKRRPART */

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¤³¤Î¥Ö¥í¥Ã¥¯¥Ç¥Ð¥¤¥¹ (block device) ¤Î̾Á°¤Ï¡¢¼¡¤Î¤è¤¦¤Ê·Á¼°¤ò¤È¤ë: sdlp, ¤³¤Î¤¦¤Á¡¢ l ¤ÏʪÍý¥É¥é¥¤¥Ö¤ò°ÕÌ£¤¹¤ëʸ»ú¤Ç¤¢¤ê¡¢ p ¤Ï¤½¤ÎʪÍý¥É¥é¥¤¥Ö¾å¤Î¥Ñ¡¼¥Æ¥£¥·¥ç¥ó (partition) ¤ò°ÕÌ£¤¹¤ë¿ô»ú¤Ç¤¢¤ë¡£ ¥Ñ¡¼¥Æ¥£¥·¥ç¥ó¥Ê¥ó¥Ð¡¼ p ¤¬¤Ê¤¤¾ì¹ç¤Ï¡¢¤½¤Î¥Ç¥Ð¥¤¥¹¥Õ¥¡¥¤¥ë¤Ï¥É¥é¥¤¥ÖÁ´ÂΤò¤µ¤¹¡£

SCSI ¥Ç¥£¥¹¥¯¤Ï¥á¥¸¥ã¡¼¥Ê¥ó¥Ð¡¼ 8 ¤ò»ý¤Á¡¢¼¡¤Î¤è¤¦¤Ê·Á¼°¤Î¥Þ¥¤¥Ê¡¼¥Ê¥ó¥Ð¡¼ ¤ò»ý¤Ä¡£(16 * drive_number) + partition_number¡¢ ¤³¤Î drive_number ¤Ï¸¡½Ð¤µ¤ì¤¿ÊªÍý¥É¥é¥¤¥Ö¤ÎÈÖ¹æ¤Ç¤¢¤ê¡¢ partition_number ¤Ï¼¡¤Î¤è¤¦¤Ë¤Ê¤ë:

¥Ñ¡¼¥Æ¥£¥·¥ç¥ó 0 ¤Ï¥É¥é¥¤¥ÖÁ´ÂÎ
¥Ñ¡¼¥Æ¥£¥·¥ç¥ó 1 ¡Á 4 ¤Ï DOS ¤Î "´ðËÜ (primary)" ¥Ñ¡¼¥Æ¥£¥·¥ç¥ó
¥Ñ¡¼¥Æ¥£¥·¥ç¥ó 5 ¡Á 8 ¤Ï DOS ¤Î "³ÈÄ¥ (extended)" (¤Þ¤¿¤Ï¡¢"ÏÀÍý (logical)") ¥Ñ¡¼¥Æ¥£¥·¥ç¥ó¡£

Î㤨¤Ð¡¢ /dev/sda ¤Ï¥á¥¸¥ã¡¼¥Ê¥ó¥Ð¡¼ 8 ¥Þ¥¤¥Ê¡¼¥Ê¥ó¥Ð¡¼ 0 ¤ò»ý¤Á¡¢¥·¥¹¥Æ¥à¤ÎºÇ½é¤Î SCSI ¥É¥é¥¤¥ÖÁ´ÂΤò»²¾È¤¹¤ë¡£¤½¤·¤Æ¡¢ /dev/sdb3 ¤Ï¥á¥¸¥ã¡¼¥Ê¥ó¥Ð¡¼ 8 ¥Þ¥¤¥Ê¡¼¥Ê¥ó¥Ð¡¼ 19 ¤ò»ý¤Á¡¢¥·¥¹¥Æ¥à¤ÎÆó¤ÄÌܤΠSCSI ¥É¥é¥¤¥Ö¤Î»°ÈÖÌܤΠDOS "´ðËÜ" ¥Ñ¡¼¥Æ¥£¥·¥ç¥ó¤ò»²¾È¤¹¤ë¡£

¸½ºß¤Ï¡¢¥Ö¥í¥Ã¥¯¥Ç¥Ð¥¤¥¹¤À¤±¤¬Ä󶡤µ¤ì¤Æ¤¤¤ë¡£¥í¡¼¡¦¥Ç¥Ð¥¤¥¹ (raw device) ¤Ï¤Þ¤À¼ÂÁõ¤µ¤ì¤Æ¤¤¤Ê¤¤¡£

ÀâÌÀ

¼¡¤Î ioctl ¤¬Ä󶡤µ¤ì¤Æ¤¤¤ë:

HDIO_GETGEO

¼¡¤Î¤è¤¦¤Ê¹½Â¤ÂΤòÍѤ¤¤Æ BIOS ¤Î¥Ç¥£¥¹¥¯¥Ñ¥é¥á¡¼¥¿¤òÊÖ¤¹:

struct hd_geometry {

      unsigned char heads;

      unsigned char sectors;

      unsigned short cylinders;

      unsigned long start;

};

¤³¤Î¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤¬ ioctl(2) ¤Ø¤Î¥Ñ¥é¥á¡¼¥¿¤È¤·¤ÆÅϤµ¤ì¤ë¡£

¤³¤Î¥Ñ¥é¥á¡¼¥¿¤ËÆþ¤ì¤é¤ì¤ÆÊÖ¤µ¤ì¤ë¾ðÊó¤Ï¡¢ DOS ¤Ë¤è¤Ã¤ÆÍý²ò¤µ¤ì¤ë¤è¤¦¤Ê ¥É¥é¥¤¥Ö¤Î¥¸¥ª¥á¥È¥ê¤Ç¤¢¤ë¡£ ¤³¤Î¥¸¥ª¥á¥È¥ê¤Ï¡¢¥É¥é¥¤¥Ö¤ÎʪÍýŪ¤Ê¥¸¥ª¥á¥È¥ê ¤Ç¤Ï¤Ê¤¤¡£ ¤³¤Î¾ðÊó¤Ï¥É¥é¥¤¥Ö¤Î¥Ñ¡¼¥Æ¥£¥·¥ç¥ó¥Æ¡¼¥Ö¥ë¤òºîÀ®¤¹¤ë»þ¤ËÍѤ¤¤é¤ì¤ë¡¢ ¤Þ¤¿¡¢ fdisk(1), efdisk(1), lilo(1) ¤ÎŬÀÚ¤ÊÁàºî¤ËɬÍפǤ¢¤ë¡£ ¤â¤·¡¢¥¸¥ª¥á¥È¥ê¤Î¾ðÊó¤¬ÆÀ¤é¤ì¤Ê¤±¤ì¤Ð¡¢¤½¤ì¤¾¤ì¤ÎÃÍÁ´¤Æ¤Ë¥¼¥í¤¬Æþ¤ì ¤é¤ì¤ÆÊÖ¤µ¤ì¤ë¡£

BLKGETSIZE

¥»¥¯¥¿¤Î¿ô¤Çɽ¤·¤¿¥Ç¥Ð¥¤¥¹¤Î¥µ¥¤¥º¤¬ÊÖ¤µ¤ì¤ë¡£ ioctl(2) ¤Î¥Ñ¥é¥á¡¼¥¿¤Ï¡¢ long ¤Ø¤Î¥Ý¥¤¥ó¥¿¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

BLKRRPART

¶¯À©Åª¤Ë¡¢SCSI ¥Ç¥£¥¹¥¯¤Î¥Ñ¡¼¥Æ¥£¥·¥ç¥ó¥Æ¡¼¥Ö¥ë¤ÎºÆÆɤ߹þ¤ß¤ò¹Ô¤¦¡£ ¥Ñ¥é¥á¡¼¥¿¤ÏɬÍפʤ¤¡£

scsi(4) ¤Î ioctl(2) Áàºî¤âƱÍͤ˥µ¥Ý¡¼¥È¤µ¤ì¤ë¡£ ioctl(2) ¤Î¥Ñ¥é¥á¡¼¥¿¤¬É¬Íפǡ¢¤½¤ì¤¬ NULL ¤Ê¤é¤Ð¡¢ ioctl(2) ¤Ï -EINVAL ¤òÊÖ¤¹¡£

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