Add micro "disk" layer which should enable us to pull all the slice/label
stuff out of the device drivers.
This commit is contained in:
Poul-Henning Kamp
parent
27108a1511
commit
da9e4f5550
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=50565
@ -326,6 +326,7 @@ kern/md5c.c standard
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kern/subr_autoconf.c standard
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kern/subr_bus.c standard
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kern/subr_devstat.c standard
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kern/subr_disk.c standard
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kern/subr_diskslice.c standard
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kern/subr_dkbad.c standard
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kern/subr_eventhandler.c standard
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183
sys/kern/subr_disk.c
Normal file
183
sys/kern/subr_disk.c
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@ -0,0 +1,183 @@
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/*
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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/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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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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static struct cdevsw disk_cdevsw = {
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/* open */ diskopen,
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/* close */ diskclose,
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/* read */ physread,
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/* write */ physwrite,
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/* ioctl */ diskioctl,
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/* stop */ nostop,
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/* reset */ noreset,
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/* devtotty */ nodevtotty,
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/* poll */ nopoll,
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/* mmap */ nommap,
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/* strategy */ diskstrategy,
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/* name */ "disk",
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/* parms */ noparms,
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/* maj */ -1,
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/* dump */ nodump,
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/* psize */ diskpsize,
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/* flags */ D_DISK,
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/* maxio */ 0,
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/* bmaj */ -1,
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};
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dev_t
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disk_create(int unit, struct disk *dp, struct cdevsw *cdevsw)
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{
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dev_t dev;
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struct cdevsw *cds;
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dp->d_devsw = cdevsw;
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dev = makedev(cdevsw->d_maj, 0);
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cds = devsw(dev);
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if (!cds) {
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/* Build the "real" cdevsw */
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MALLOC(cds, struct cdevsw *, sizeof(*cds), M_DISK, M_WAITOK);
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*cds = disk_cdevsw;
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cds->d_name = dp->d_devsw->d_name;
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cds->d_maj = dp->d_devsw->d_maj;
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cds->d_bmaj = dp->d_devsw->d_bmaj;
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cds->d_flags = dp->d_devsw->d_flags;
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cdevsw_add(cds);
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}
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printf("Creating DISK %s%d\n", cds->d_name, unit);
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dev = make_dev(cds, dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART),
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0, 0, 0, "r%s%d", cds->d_name, unit);
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dev->si_disk = dp;
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dp->d_dev = dev;
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return (dev);
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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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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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pdev = dkmodpart(dkmodslice(dev, WHOLE_DISK_SLICE), RAW_PART);
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dp = pdev->si_disk;
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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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if (!dp)
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return (ENXIO);
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dev->si_disk = dp;
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if (!dp->d_opencount++) {
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error = dp->d_devsw->d_open(dev, oflags, devtype, p);
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if (error)
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return(error);
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}
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error = dsopen(dev, devtype, 0, &dp->d_slice, &dp->d_label);
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if (error && !--dp->d_opencount)
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dp->d_devsw->d_close(dev, 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 (!--dp->d_opencount)
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error = dp->d_devsw->d_close(dev, fflag, devtype, p);
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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 = 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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/* XXX: don't set bp->b_dev->si_disk (?) */
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} else {
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pdev = dp->d_dev;
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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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dp = dev->si_disk;
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return (dssize(dev, &dp->d_slice));
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}
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@ -47,6 +47,7 @@
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#define SPECNAMELEN 15
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struct tty;
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struct disk;
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struct vnode;
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struct specinfo {
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@ -65,6 +66,7 @@ struct specinfo {
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struct tty *__sit_tty;
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} __si_tty;
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struct {
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struct disk *__sid_disk;
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struct mount *__sid_mountpoint;
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int __sid_bsize_phys; /* min physical block size */
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int __sid_bsize_best; /* optimal block size */
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@ -74,6 +76,7 @@ struct specinfo {
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};
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#define si_tty_tty __si_u.__si_tty.__sit_tty
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#define si_disk __si_u.__si_disk.__sid_disk
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#define si_mountpoint __si_u.__si_disk.__sid_mountpoint
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#define si_bsize_phys __si_u.__si_disk.__sid_bsize_phys
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#define si_bsize_best __si_u.__si_disk.__sid_bsize_best
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35
sys/sys/disk.h
Normal file
35
sys/sys/disk.h
Normal file
@ -0,0 +1,35 @@
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/*
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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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#ifndef _SYS_DISK_H_
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#define _SYS_DISK_H_
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#ifndef _SYS_DISKSLICE_H_
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#include <sys/diskslice.h>
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#endif /* _SYS_DISKSLICE_H_ */
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#ifndef _SYS_DISKLABEL
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#include <sys/disklabel.h>
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#endif /* _SYS_DISKLABEL */
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struct disk {
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int d_opencount;
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struct cdevsw *d_devsw;
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dev_t d_dev;
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struct diskslices *d_slice;
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struct disklabel d_label;
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};
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dev_t disk_create __P((int unit, struct disk *disk, struct cdevsw *cdevsw));
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void disk_delete __P((dev_t dev));
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#endif /* _SYS_DISK_H_ */
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@ -47,6 +47,7 @@
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#define SPECNAMELEN 15
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struct tty;
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struct disk;
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struct vnode;
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struct specinfo {
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@ -65,6 +66,7 @@ struct specinfo {
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struct tty *__sit_tty;
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} __si_tty;
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struct {
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struct disk *__sid_disk;
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struct mount *__sid_mountpoint;
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int __sid_bsize_phys; /* min physical block size */
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int __sid_bsize_best; /* optimal block size */
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@ -74,6 +76,7 @@ struct specinfo {
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};
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#define si_tty_tty __si_u.__si_tty.__sit_tty
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#define si_disk __si_u.__si_disk.__sid_disk
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#define si_mountpoint __si_u.__si_disk.__sid_mountpoint
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#define si_bsize_phys __si_u.__si_disk.__sid_bsize_phys
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#define si_bsize_best __si_u.__si_disk.__sid_bsize_best
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