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Annotation of coherent/b/kernel/io.386/fdisk.c, revision 1.1.1.1

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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