mirror of
https://git.FreeBSD.org/src.git
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372 lines
7.8 KiB
C
372 lines
7.8 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/bio.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 <sys/sysctl.h>
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#include <machine/md_var.h>
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#include <sys/ctype.h>
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static 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 LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist);
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static void
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disk_clone(void *arg, char *name, int namelen, dev_t *dev)
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{
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struct disk *dp;
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char const *d;
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int i, u, s, p;
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dev_t pdev;
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if (*dev != NODEV)
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return;
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LIST_FOREACH(dp, &disklist, d_list) {
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d = dp->d_devsw->d_name;
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i = strlen(d);
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if (bcmp(d, name, i) != 0)
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continue;
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u = 0;
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if (!isdigit(name[i]))
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continue;
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while (isdigit(name[i])) {
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u *= 10;
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u += name[i++] - '0';
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}
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if (u > DKMAXUNIT)
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continue;
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p = RAW_PART;
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s = WHOLE_DISK_SLICE;
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pdev = makedev(dp->d_devsw->d_maj, dkmakeminor(u, s, p));
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if (pdev->si_disk == NULL)
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continue;
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if (name[i] != '\0') {
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if (name[i] == 's') {
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s = 0;
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i++;
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if (!isdigit(name[i]))
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continue;
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while (isdigit(name[i])) {
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s *= 10;
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s += name[i++] - '0';
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}
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s += BASE_SLICE - 1;
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} else {
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s = COMPATIBILITY_SLICE;
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}
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if (name[i] == '\0')
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;
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else if (name[i] < 'a' || name[i] > 'h')
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continue;
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else
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p = name[i] - 'a';
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}
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*dev = make_dev(pdev->si_devsw, dkmakeminor(u, s, p),
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UID_ROOT, GID_OPERATOR, 0640, name);
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dev_depends(pdev, *dev);
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return;
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}
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}
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static void
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inherit_raw(dev_t pdev, dev_t dev)
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{
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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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}
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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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static int once;
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dev_t dev;
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if (!once) {
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EVENTHANDLER_REGISTER(dev_clone, disk_clone, 0, 1000);
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once++;
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}
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bzero(dp, sizeof(*dp));
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if (proto->d_open != diskopen) {
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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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if (bootverbose)
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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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UID_ROOT, GID_OPERATOR, 0640, "%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_dsflags = flags;
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dp->d_devsw = cdevsw;
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LIST_INSERT_HEAD(&disklist, dp, d_list);
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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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if (disk->d_slice)
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dsgone(&disk->d_slice);
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}
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void
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disk_destroy(dev_t dev)
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{
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LIST_REMOVE(dev->si_disk, d_list);
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bzero(dev->si_disk, sizeof(*dev->si_disk));
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dev->si_disk = NULL;
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destroy_dev(dev);
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return;
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}
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struct disk *
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disk_enumerate(struct disk *disk)
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{
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if (!disk)
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return (LIST_FIRST(&disklist));
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else
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return (LIST_NEXT(disk, d_list));
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}
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static int
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sysctl_disks(SYSCTL_HANDLER_ARGS)
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{
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struct disk *disk;
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int error, first;
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disk = NULL;
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first = 1;
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while ((disk = disk_enumerate(disk))) {
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if (!first) {
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error = SYSCTL_OUT(req, " ", 1);
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if (error)
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return error;
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} else {
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first = 0;
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}
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error = SYSCTL_OUT(req, disk->d_dev->si_name, strlen(disk->d_dev->si_name));
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if (error)
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return error;
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}
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error = SYSCTL_OUT(req, "", 1);
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return error;
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}
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SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, 0, NULL,
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sysctl_disks, "A", "names of available disks");
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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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while (dp->d_flags & DISKFLAG_LOCK) {
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dp->d_flags |= DISKFLAG_WANTED;
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error = tsleep(dp, PRIBIO | PCATCH, "diskopen", hz);
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if (error)
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return (error);
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}
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dp->d_flags |= DISKFLAG_LOCK;
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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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inherit_raw(pdev, dev);
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if (error)
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goto out;
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error = dsopen(dev, devtype, dp->d_dsflags, &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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out:
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dp->d_flags &= ~DISKFLAG_LOCK;
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if (dp->d_flags & DISKFLAG_WANTED) {
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dp->d_flags &= ~DISKFLAG_WANTED;
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wakeup(dp);
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}
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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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dev_t pdev;
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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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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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return (error);
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}
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static void
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diskstrategy(struct bio *bp)
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{
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dev_t pdev;
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struct disk *dp;
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pdev = dkmodpart(dkmodslice(bp->bio_dev, WHOLE_DISK_SLICE), RAW_PART);
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dp = pdev->si_disk;
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bp->bio_resid = bp->bio_bcount;
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if (dp != bp->bio_dev->si_disk)
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inherit_raw(pdev, bp->bio_dev);
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if (!dp) {
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biofinish(bp, NULL, ENXIO);
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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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if (bp->bio_bcount == 0) {
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biodone(bp);
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return;
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}
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KASSERT(dp->d_devsw != NULL, ("NULL devsw"));
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KASSERT(dp->d_devsw->d_strategy != NULL, ("NULL d_strategy"));
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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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dev_t pdev;
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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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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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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 (-1);
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if (dp != dev->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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