91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*
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* $Id: disksubr.c,v 1.6 1994/02/13 21:13:18 chopps Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/disklabel.h>
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#include <sys/syslog.h>
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/*
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* Attempt to read a disk label from a device
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* using the indicated stategy routine.
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* The label must be partly set up before this:
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* secpercyl and anything required in the strategy routine
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* (e.g., sector size) must be filled in before calling us.
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* Returns null on success and an error string on failure.
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*/
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char *
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readdisklabel(dev, strat, lp, osdep)
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dev_t dev;
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void (*strat)();
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register struct disklabel *lp;
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struct cpu_disklabel *osdep;
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{
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/* I don't want BSD to fiddle with the RDBs, let the user use
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HDToolbox under AmigaDOS to partition disk drives. */
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return "partition drive under AmigaDOS";
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}
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/*
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* Check new disk label for sensibility
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* before setting it.
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*/
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int
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setdisklabel(olp, nlp, openmask, osdep)
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register struct disklabel *olp, *nlp;
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u_long openmask;
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struct cpu_disklabel *osdep;
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{
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register i;
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register struct partition *opp, *npp;
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if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC ||
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dkcksum(nlp) != 0)
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return (EINVAL);
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while ((i = ffs((long)openmask)) != 0) {
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i--;
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openmask &= ~(1 << i);
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if (nlp->d_npartitions <= i)
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return (EBUSY);
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opp = &olp->d_partitions[i];
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npp = &nlp->d_partitions[i];
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if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
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return (EBUSY);
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/*
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* Copy internally-set partition information
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* if new label doesn't include it. XXX
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*/
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if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
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npp->p_fstype = opp->p_fstype;
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npp->p_fsize = opp->p_fsize;
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npp->p_frag = opp->p_frag;
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npp->p_cpg = opp->p_cpg;
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}
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}
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nlp->d_checksum = 0;
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nlp->d_checksum = dkcksum(nlp);
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*olp = *nlp;
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return (0);
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}
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/* encoding of disk minor numbers, should be elsewhere... */
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#define dkunit(dev) (minor(dev) >> 3)
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#define dkpart(dev) (minor(dev) & 07)
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#define dkminor(unit, part) (((unit) << 3) | (part))
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/*
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* Write disk label back to device after modification.
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*/
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writedisklabel(dev, strat, lp, osdep)
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dev_t dev;
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void (*strat)();
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register struct disklabel *lp;
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struct cpu_disklabel *osdep;
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{
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return EINVAL;
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}
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