mirror of
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d1f088dab5
Submitted by: phk
231 lines
5.0 KiB
C
231 lines
5.0 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*
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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/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/disk.h>
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#include <sys/malloc.h>
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#include <machine/md_var.h>
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MALLOC_DEFINE(M_DISK, "disk", "disk data");
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static d_strategy_t diskstrategy;
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static d_open_t diskopen;
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static d_close_t diskclose;
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static d_ioctl_t diskioctl;
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static d_psize_t diskpsize;
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dev_t
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disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto)
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{
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dev_t dev;
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bzero(dp, sizeof(*dp));
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dev = makedev(cdevsw->d_maj, 0);
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if (!devsw(dev)) {
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*proto = *cdevsw;
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proto->d_open = diskopen;
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proto->d_close = diskclose;
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proto->d_ioctl = diskioctl;
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proto->d_strategy = diskstrategy;
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proto->d_psize = diskpsize;
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cdevsw_add(proto);
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}
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printf("Creating DISK %s%d\n", cdevsw->d_name, unit);
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dev = make_dev(proto, dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART),
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0, 0, 0, "r%s%d", cdevsw->d_name, unit);
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dev->si_disk = dp;
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dp->d_dev = dev;
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dp->d_flags = flags;
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dp->d_devsw = cdevsw;
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return (dev);
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}
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int
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disk_dumpcheck(dev_t dev, u_int *count, u_int *blkno, u_int *secsize)
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{
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struct disk *dp;
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struct disklabel *dl;
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u_int boff;
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dp = dev->si_disk;
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if (!dp)
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return (ENXIO);
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if (!dp->d_slice)
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return (ENXIO);
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dl = dsgetlabel(dev, dp->d_slice);
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if (!dl)
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return (ENXIO);
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*count = (u_long)Maxmem * PAGE_SIZE / dl->d_secsize;
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if (dumplo < 0 ||
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(dumplo + *count > dl->d_partitions[dkpart(dev)].p_size))
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return (EINVAL);
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boff = dl->d_partitions[dkpart(dev)].p_offset +
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dp->d_slice->dss_slices[dkslice(dev)].ds_offset;
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*blkno = boff + dumplo;
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*secsize = dl->d_secsize;
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return (0);
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}
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void
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disk_invalidate (struct disk *disk)
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{
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dsgone(&disk->d_slice);
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}
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void
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disk_delete(dev_t dev)
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{
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return;
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}
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/*
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* The cdevsw functions
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*/
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static int
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diskopen(dev_t dev, int oflags, int devtype, struct proc *p)
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{
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dev_t pdev;
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struct disk *dp;
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int error;
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error = 0;
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pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
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dp = pdev->si_disk;
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if (!dp)
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return (ENXIO);
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if (!dsisopen(dp->d_slice)) {
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if (!pdev->si_iosize_max)
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pdev->si_iosize_max = dev->si_iosize_max;
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error = dp->d_devsw->d_open(pdev, oflags, devtype, p);
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}
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/* Inherit properties from the whole/raw dev_t */
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dev->si_disk = pdev->si_disk;
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dev->si_drv1 = pdev->si_drv1;
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dev->si_drv2 = pdev->si_drv2;
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dev->si_iosize_max = pdev->si_iosize_max;
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dev->si_bsize_phys = pdev->si_bsize_phys;
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dev->si_bsize_best = pdev->si_bsize_best;
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if (error)
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return(error);
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error = dsopen(dev, devtype, dp->d_flags, &dp->d_slice, &dp->d_label);
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if (!dsisopen(dp->d_slice))
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dp->d_devsw->d_close(pdev, oflags, devtype, p);
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return(error);
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}
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static int
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diskclose(dev_t dev, int fflag, int devtype, struct proc *p)
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{
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struct disk *dp;
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int error;
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error = 0;
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dp = dev->si_disk;
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dsclose(dev, devtype, dp->d_slice);
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if (!dsisopen(dp->d_slice)) {
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error = dp->d_devsw->d_close(dp->d_dev, fflag, devtype, p);
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}
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return (error);
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}
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static void
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diskstrategy(struct buf *bp)
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{
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dev_t pdev;
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struct disk *dp;
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dp = bp->b_dev->si_disk;
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if (!dp) {
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pdev = dkmodpart(dkmodslice(bp->b_dev, WHOLE_DISK_SLICE), RAW_PART);
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dp = bp->b_dev->si_disk = pdev->si_disk;
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bp->b_dev->si_drv1 = pdev->si_drv1;
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bp->b_dev->si_drv2 = pdev->si_drv2;
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bp->b_dev->si_iosize_max = pdev->si_iosize_max;
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bp->b_dev->si_bsize_phys = pdev->si_bsize_phys;
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bp->b_dev->si_bsize_best = pdev->si_bsize_best;
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}
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if (!dp) {
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bp->b_error = ENXIO;
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bp->b_flags |= B_ERROR;
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biodone(bp);
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return;
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}
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if (dscheck(bp, dp->d_slice) < 0) {
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biodone(bp);
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return;
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}
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dp->d_devsw->d_strategy(bp);
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return;
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}
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static int
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diskioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct proc *p)
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{
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struct disk *dp;
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int error;
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dp = dev->si_disk;
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error = dsioctl(dev, cmd, data, fflag, &dp->d_slice);
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if (error == ENOIOCTL)
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error = dp->d_devsw->d_ioctl(dev, cmd, data, fflag, p);
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return (error);
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}
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static int
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diskpsize(dev_t dev)
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{
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struct disk *dp;
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dev_t pdev;
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dp = dev->si_disk;
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if (!dp) {
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pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
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dp = pdev->si_disk;
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dev->si_drv1 = pdev->si_drv1;
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dev->si_drv2 = pdev->si_drv2;
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/* XXX: don't set bp->b_dev->si_disk (?) */
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}
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return (dssize(dev, &dp->d_slice));
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}
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SYSCTL_DECL(_debug_sizeof);
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SYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD,
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0, sizeof(struct disklabel), "sizeof(struct disklabel)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
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0, sizeof(struct diskslices), "sizeof(struct diskslices)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
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0, sizeof(struct disk), "sizeof(struct disk)");
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