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Annotation of coherent/b/kernel/io.386/fdisk.c, revision 1.1

1.1     ! root        1: /**
        !             2:  *
        !             3:  * fdisk(dev, fp)      --      Fixed Disk Configuration
        !             4:  * dev_t dev;
        !             5:  * struct fdisk_s *fp;
        !             6:  *
        !             7:  *     Input:  dev = special device to read partition information from
        !             8:  *             fp  = pointer to memory-resident partition info (to update)
        !             9:  *
        !            10:  *     Action: Open special device for reading.
        !            11:  *             Read first block from the device.
        !            12:  *             If valid signature present on block,
        !            13:  *                     copy partition information to memory
        !            14:  *
        !            15:  *     Return: 1 = partition information successfully updated
        !            16:  *             0 = failure (could not read block, or bad signature)
        !            17:  */
        !            18: 
        !            19: #include <sys/coherent.h>
        !            20: #include <errno.h>
        !            21: #include <sys/inode.h>
        !            22: #include <sys/fdisk.h>
        !            23: #include <sys/buf.h>
        !            24: #include <sys/con.h>
        !            25: 
        !            26: fdisk(dev, fp)
        !            27: dev_t dev;
        !            28: register struct fdisk_s *fp;
        !            29: {
        !            30:        register struct hdisk_s *hp;
        !            31:        BUF *bp;
        !            32:        int s, i;
        !            33:        int ret = 0;
        !            34: 
        !            35:        s = sphi();
        !            36:        dopen(dev, IPR, DFBLK);
        !            37: 
        !            38:        if (u.u_error == 0) {           /* special device now open */
        !            39: 
        !            40:                if (bp = bread(dev, (daddr_t) 0, 1)) {  /* data read */
        !            41: 
        !            42:                        /* buffer cache is in kernel data space */
        !            43: #ifdef _I386
        !            44:                        hp = bp->b_vaddr;
        !            45: #else
        !            46:                        hp = FP_OFF(bp->b_faddr);
        !            47: #endif
        !            48: 
        !            49:                        if(hp->hd_sig==HDSIG) {
        !            50:                                for (i=0; i < NPARTN; ++i)
        !            51:                                        *fp++ = hp->hd_partn[i];
        !            52:                                ret   = 1;
        !            53:                        }
        !            54:                        brelease(bp);
        !            55:                }
        !            56:                dclose(dev);
        !            57:        }
        !            58:        spl(s);
        !            59:        return ret;
        !            60: }

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