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This is the first snapshot of the new all-singing-and-dancing md(4).

Browse Source 
Using the mdconfig(8) program you can now configure memory disks
on malloc(9), swap or a file/vnode.  preloaded md disks also work
as usual.
This commit is contained in:
Poul-Henning Kamp 2000-12-31 13:03:42 +00:00
parent 284f963cf5
commit 8f8def9e2c
2 changed files with 524 additions and 137 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
sbin/mdconfig/mdconfig.c
View File

@ -27,8 +27,9 @@ enum {UNSET, ATTACH, DETACH} action = UNSET;
void
usage()
{
fprintf(stderr, "Usage:\n\t");
fprintf(stderr, "mdconfig {-a|-d} -t type [-o [no]option]... [ -f file] [-s size] [-u unit]\n");
fprintf(stderr, "Usage:\n");
fprintf(stderr, "\tmdconfig -a -t type [-o [no]option]... [ -f file] [-s size] [-u unit]\n");
fprintf(stderr, "\tmdconfig -d -u unit\n");
fprintf(stderr, "\t\ttype = {malloc, preload, vnode, swap}\n");
fprintf(stderr, "\t\toption = {cluster, compress, reserve, autounit}\n");
fprintf(stderr, "\t\tsize = %%d (512 byte blocks), %%dk (kB), %%dm (MB) or %%dg (GB)\n");
@ -57,7 +58,8 @@ main(int argc, char **argv)
if (cmdline != 0)
usage();
action = DETACH;
cmdline = 1;
mdio.md_options = MD_AUTOUNIT;
cmdline = 3;
break;
case 't':
if (cmdline != 1)
@ -122,7 +124,7 @@ main(int argc, char **argv)
errx(1, "Unknown suffix on -s argument");
break;
case 'u':
if (cmdline != 2)
if (cmdline != 2 && cmdline != 3)
usage();
mdio.md_unit = strtoul(optarg, NULL, 0);
mdio.md_options &= ~MD_AUTOUNIT;
@ -135,12 +137,17 @@ main(int argc, char **argv)
fd = open("/dev/mdctl", O_RDWR, 0);
if (fd < 0)
err(1, "open(/dev/mdctl)");
if (action == ATTACH)
if (action == ATTACH) {
i = ioctl(fd, MDIOCATTACH, &mdio);
else
} else {
if (mdio.md_options & MD_AUTOUNIT)
usage();
i = ioctl(fd, MDIOCDETACH, &mdio);
}
if (i < 0)
err(1, "ioctl(/dev/mdctl)");
if (mdio.md_options & MD_AUTOUNIT)
printf("md%d\n", mdio.md_unit);
return (0);
}

642
sys/dev/md/md.c
View File

@ -24,6 +24,19 @@
#include <sys/sysctl.h>
#include <sys/linker.h>
#include <sys/queue.h>
#include <sys/mdioctl.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/fcntl.h>
#include <sys/proc.h>
#include <machine/atomic.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
#include <vm/vm_zone.h>
#include <vm/swap_pager.h>
#ifndef MD_NSECT
#define MD_NSECT (10000 * 2)
@ -52,17 +65,13 @@ static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here";
#endif
static int mdrootready;
static void mdcreate_malloc(int unit);
static int mdunits;
#define CDEV_MAJOR 95
#define BDEV_MAJOR 22
static d_strategy_t mdstrategy;
static d_strategy_t mdstrategy_preload;
static d_strategy_t mdstrategy_malloc;
static d_open_t mdopen;
static d_ioctl_t mdioctl;
static d_ioctl_t mdioctl, mdctlioctl;
static struct cdevsw md_cdevsw = {
/* open */ mdopen,
@ -78,7 +87,19 @@ static struct cdevsw md_cdevsw = {
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ D_DISK | D_CANFREE | D_MEMDISK,
/* bmaj */ BDEV_MAJOR
};
static struct cdevsw mdctl_cdevsw = {
/* open */ nullopen,
/* close */ nullclose,
/* read */ noread,
/* write */ nowrite,
/* ioctl */ mdctlioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "md",
/* maj */ CDEV_MAJOR
};
static struct cdevsw mddisk_cdevsw;
@ -93,8 +114,10 @@ struct md_s {
struct disk disk;
dev_t dev;
int busy;
enum {MD_MALLOC, MD_PRELOAD} type;
enum md_types type;
unsigned nsect;
unsigned secsize;
unsigned flags;
/* MD_MALLOC related fields */
unsigned nsecp;
@ -103,9 +126,14 @@ struct md_s {
/* MD_PRELOAD related fields */
u_char *pl_ptr;
unsigned pl_len;
};
static int mdunits;
/* MD_VNODE related fields */
struct vnode *vnode;
struct ucred *cred;
/* MD_OBJET related fields */
vm_object_t object;
};
static int
mdopen(dev_t dev, int flag, int fmt, struct proc *p)
@ -118,13 +146,12 @@ mdopen(dev_t dev, int flag, int fmt, struct proc *p)
devtoname(dev), flag, fmt, p);
sc = dev->si_drv1;
if ((!devfs_present) && sc->unit + 1 == mdunits)
mdcreate_malloc(-1);
dl = &sc->disk.d_label;
bzero(dl, sizeof(*dl));
dl->d_secsize = DEV_BSIZE;
dl->d_nsectors = 1024;
dl->d_secsize = sc->secsize;
if (sc->nsect > 1024)
dl->d_nsectors = sc->nsect > 1024 ? 1024 : sc->nsect;
dl->d_ntracks = 1;
dl->d_secpercyl = dl->d_nsectors * dl->d_ntracks;
dl->d_secperunit = sc->nsect;
@ -144,57 +171,20 @@ mdioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
}
static void
mdstrategy(struct bio *bp)
mdstart_malloc(struct md_s *sc)
{
struct md_s *sc;
if (md_debug > 1)
printf("mdstrategy(%p) %s %x, %d, %ld, %p)\n",
bp, devtoname(bp->bio_dev), bp->bio_flags, bp->bio_blkno,
bp->bio_bcount / DEV_BSIZE, bp->bio_data);
sc = bp->bio_dev->si_drv1;
if (sc->type == MD_MALLOC) {
mdstrategy_malloc(bp);
} else {
mdstrategy_preload(bp);
}
return;
}
static void
mdstrategy_malloc(struct bio *bp)
{
int s, i;
struct md_s *sc;
int i;
struct bio *bp;
devstat_trans_flags dop;
u_char *secp, **secpp, *dst;
unsigned secno, nsec, secval, uc;
if (md_debug > 1)
printf("mdstrategy_malloc(%p) %s %x, %d, %ld, %p)\n",
bp, devtoname(bp->bio_dev), bp->bio_flags, bp->bio_blkno,
bp->bio_bcount / DEV_BSIZE, bp->bio_data);
sc = bp->bio_dev->si_drv1;
s = splbio();
bioqdisksort(&sc->bio_queue, bp);
if (sc->busy) {
splx(s);
return;
}
sc->busy++;
while (1) {
for (;;) {
/* XXX: LOCK(unique unit numbers) */
bp = bioq_first(&sc->bio_queue);
if (bp)
bioq_remove(&sc->bio_queue, bp);
splx(s);
/* XXX: UNLOCK(unique unit numbers) */
if (!bp)
break;
@ -211,7 +201,6 @@ mdstrategy_malloc(struct bio *bp)
secno = bp->bio_pblkno;
dst = bp->bio_data;
while (nsec--) {
if (secno < sc->nsecp) {
secpp = &sc->secp[secno];
if ((uintptr_t)*secpp > 255) {
@ -231,7 +220,7 @@ mdstrategy_malloc(struct bio *bp)
bp->bio_flags, secpp, secp, secval);
if (bp->bio_cmd == BIO_DELETE) {
if (secpp) {
if (secpp && !(sc->flags & MD_RESERVE)) {
if (secp)
FREE(secp, M_MDSECT);
*secpp = 0;
@ -246,10 +235,15 @@ mdstrategy_malloc(struct bio *bp)
bzero(dst, DEV_BSIZE);
}
} else {
uc = dst[0];
for (i = 1; i < DEV_BSIZE; i++)
if (dst[i] != uc)
break;
if (sc->flags & MD_COMPRESS) {
uc = dst[0];
for (i = 1; i < DEV_BSIZE; i++)
if (dst[i] != uc)
break;
} else {
i = 0;
uc = 0;
}
if (i == DEV_BSIZE && !uc) {
if (secp)
FREE(secp, M_MDSECT);
@ -272,7 +266,6 @@ mdstrategy_malloc(struct bio *bp)
if (!secp)
MALLOC(secp, u_char *, DEV_BSIZE, M_MDSECT, M_WAITOK);
bcopy(dst, secp, DEV_BSIZE);
*secpp = secp;
}
}
@ -283,43 +276,23 @@ mdstrategy_malloc(struct bio *bp)
bp->bio_resid = 0;
devstat_end_transaction_bio(&sc->stats, bp);
biodone(bp);
s = splbio();
}
sc->busy = 0;
return;
}
static void
mdstrategy_preload(struct bio *bp)
mdstart_preload(struct md_s *sc)
{
int s;
struct md_s *sc;
struct bio *bp;
devstat_trans_flags dop;
if (md_debug > 1)
printf("mdstrategy_preload(%p) %s %x, %d, %ld, %p)\n",
bp, devtoname(bp->bio_dev), bp->bio_flags, bp->bio_blkno,
bp->bio_bcount / DEV_BSIZE, bp->bio_data);
sc = bp->bio_dev->si_drv1;
s = splbio();
bioqdisksort(&sc->bio_queue, bp);
if (sc->busy) {
splx(s);
return;
}
sc->busy++;
while (1) {
for (;;) {
/* XXX: LOCK(unique unit numbers) */
bp = bioq_first(&sc->bio_queue);
if (bp)
bioq_remove(&sc->bio_queue, bp);
splx(s);
/* XXX: UNLOCK(unique unit numbers) */
if (!bp)
break;
@ -337,27 +310,199 @@ mdstrategy_preload(struct bio *bp)
bp->bio_resid = 0;
devstat_end_transaction_bio(&sc->stats, bp);
biodone(bp);
s = splbio();
}
sc->busy = 0;
return;
}
static struct md_s *
mdcreate(int unit)
static void
mdstart_vnode(struct md_s *sc)
{
int error;
struct bio *bp;
struct uio auio;
struct iovec aiov;
struct mount *mp;
/*
* VNODE I/O
*
* If an error occurs, we set BIO_ERROR but we do not set
* B_INVAL because (for a write anyway), the buffer is
* still valid.
*/
for (;;) {
/* XXX: LOCK(unique unit numbers) */
bp = bioq_first(&sc->bio_queue);
if (bp)
bioq_remove(&sc->bio_queue, bp);
/* XXX: UNLOCK(unique unit numbers) */
if (!bp)
break;
devstat_start_transaction(&sc->stats);
bzero(&auio, sizeof(auio));
aiov.iov_base = bp->bio_data;
aiov.iov_len = bp->bio_bcount;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = (vm_ooffset_t)bp->bio_pblkno * sc->secsize;
auio.uio_segflg = UIO_SYSSPACE;
if(bp->bio_cmd == BIO_READ)
auio.uio_rw = UIO_READ;
else
auio.uio_rw = UIO_WRITE;
auio.uio_resid = bp->bio_bcount;
auio.uio_procp = curproc;
if (VOP_ISLOCKED(sc->vnode, NULL))
vprint("unexpected vn driver lock", sc->vnode);
if (bp->bio_cmd == BIO_READ) {
vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curproc);
error = VOP_READ(sc->vnode, &auio, 0, sc->cred);
} else {
(void) vn_start_write(sc->vnode, &mp, V_WAIT);
vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curproc);
error = VOP_WRITE(sc->vnode, &auio, 0, sc->cred);
vn_finished_write(mp);
}
VOP_UNLOCK(sc->vnode, 0, curproc);
bp->bio_resid = auio.uio_resid;
if (error) {
bp->bio_error = error;
bp->bio_flags |= BIO_ERROR;
}
devstat_end_transaction_bio(&sc->stats, bp);
biodone(bp);
}
return;
}
static void
mdstart_swap(struct md_s *sc)
{
struct bio *bp;
for (;;) {
/* XXX: LOCK(unique unit numbers) */
bp = bioq_first(&sc->bio_queue);
if (bp)
bioq_remove(&sc->bio_queue, bp);
/* XXX: UNLOCK(unique unit numbers) */
if (!bp)
break;
#if 0
devstat_start_transaction(&sc->stats);
#endif
if ((bp->bio_cmd == BIO_DELETE) && (sc->flags & MD_RESERVE))
biodone(bp);
else
vm_pager_strategy(sc->object, bp);
#if 0
devstat_end_transaction_bio(&sc->stats, bp);
#endif
}
return;
}
static void
mdstrategy(struct bio *bp)
{
struct md_s *sc;
if (unit == -1)
unit = mdunits++;
/* Make sure this unit isn't already in action */
if (md_debug > 1)
printf("mdstrategy(%p) %s %x, %d, %ld, %p)\n",
bp, devtoname(bp->bio_dev), bp->bio_flags, bp->bio_blkno,
bp->bio_bcount / DEV_BSIZE, bp->bio_data);
sc = bp->bio_dev->si_drv1;
/* XXX: LOCK(sc->lock) */
bioqdisksort(&sc->bio_queue, bp);
/* XXX: UNLOCK(sc->lock) */
if (atomic_cmpset_int(&sc->busy, 0, 1) == 0)
return;
switch (sc->type) {
case MD_MALLOC:
mdstart_malloc(sc);
break;
case MD_PRELOAD:
mdstart_preload(sc);
break;
case MD_VNODE:
mdstart_vnode(sc);
break;
case MD_SWAP:
mdstart_swap(sc);
break;
default:
panic("Impossible md(type)");
break;
}
sc->busy = 0;
}
static struct md_s *
mdfind(int unit)
{
struct md_s *sc;
/* XXX: LOCK(unique unit numbers) */
LIST_FOREACH(sc, &md_softc_list, list) {
if (sc->unit == unit)
return (NULL);
break;
}
/* XXX: UNLOCK(unique unit numbers) */
return (sc);
}
static struct md_s *
mdnew(int unit)
{
struct md_s *sc;
int max = -1;
/* XXX: LOCK(unique unit numbers) */
LIST_FOREACH(sc, &md_softc_list, list) {
if (sc->unit == unit) {
/* XXX: UNLOCK(unique unit numbers) */
return (NULL);
}
if (sc->unit > max)
max = sc->unit;
}
if (unit == -1)
unit = max + 1;
if (unit > DKMAXUNIT)
return (NULL);
MALLOC(sc, struct md_s *,sizeof(*sc), M_MD, M_WAITOK | M_ZERO);
LIST_INSERT_HEAD(&md_softc_list, sc, list);
sc->unit = unit;
LIST_INSERT_HEAD(&md_softc_list, sc, list);
/* XXX: UNLOCK(unique unit numbers) */
return (sc);
}
static void
mddelete(struct md_s *sc)
{
/* XXX: LOCK(unique unit numbers) */
LIST_REMOVE(sc, list);
/* XXX: UNLOCK(unique unit numbers) */
FREE(sc, M_MD);
}
static void
mdinit(struct md_s *sc)
{
bioq_init(&sc->bio_queue);
devstat_add_entry(&sc->stats, "md", sc->unit, DEV_BSIZE,
DEVSTAT_NO_ORDERED_TAGS,
@ -365,7 +510,6 @@ mdcreate(int unit)
DEVSTAT_PRIORITY_OTHER);
sc->dev = disk_create(sc->unit, &sc->disk, 0, &md_cdevsw, &mddisk_cdevsw);
sc->dev->si_drv1 = sc;
return (sc);
}
static void
@ -373,53 +517,291 @@ mdcreate_preload(u_char *image, unsigned length)
{
struct md_s *sc;
sc = mdcreate(-1);
sc = mdnew(-1);
if (sc == NULL)
return;
sc->type = MD_PRELOAD;
sc->secsize = DEV_BSIZE;
sc->nsect = length / DEV_BSIZE;
sc->pl_ptr = image;
sc->pl_len = length;
if (sc->unit == 0)
mdrootready = 1;
mdinit(sc);
}
static void
mdcreate_malloc(int unit)
static int
mdcreate_malloc(struct md_ioctl *mdio)
{
struct md_s *sc;
unsigned u;
sc = mdcreate(unit);
if (sc == NULL)
return;
if (mdio->md_size == 0)
return(EINVAL);
if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE))
return(EINVAL);
/* Compression doesn't make sense if we have reserved space */
if (mdio->md_options & MD_RESERVE)
mdio->md_options &= ~MD_COMPRESS;
if (mdio->md_options & MD_AUTOUNIT) {
sc = mdnew(-1);
if (sc == NULL)
return (ENOMEM);
mdio->md_unit = sc->unit;
} else {
sc = mdnew(mdio->md_unit);
if (sc == NULL)
return (EBUSY);
}
sc->type = MD_MALLOC;
sc->nsect = MD_NSECT; /* for now */
MALLOC(sc->secp, u_char **, sizeof(u_char *), M_MD, M_WAITOK | M_ZERO);
sc->nsecp = 1;
sc->secsize = DEV_BSIZE;
sc->nsect = mdio->md_size;
sc->flags = mdio->md_options & MD_COMPRESS;
if (!(mdio->md_options & MD_RESERVE)) {
MALLOC(sc->secp, u_char **, sizeof(u_char *), M_MD, M_WAITOK | M_ZERO);
sc->nsecp = 1;
} else {
MALLOC(sc->secp, u_char **, sc->nsect * sizeof(u_char *), M_MD, M_WAITOK | M_ZERO);
sc->nsecp = sc->nsect;
for (u = 0; u < sc->nsect; u++)
MALLOC(sc->secp[u], u_char *, DEV_BSIZE, M_MDSECT, M_WAITOK | M_ZERO);
}
printf("md%d: Malloc disk\n", sc->unit);
mdinit(sc);
return (0);
}
static void
md_clone (void *arg, char *name, int namelen, dev_t *dev)
{
int i, u;
if (*dev != NODEV)
return;
i = dev_stdclone(name, NULL, "md", &u);
if (i == 0)
return;
if (u > DKMAXUNIT)
return;
/* XXX: should check that next char is [\0sa-h] */
static int
mdsetcred(struct md_s *sc, struct ucred *cred)
{
char *tmpbuf;
int error = 0;
/*
* Now we cheat: We just create the disk, but don't match.
* Since we run before it, subr_disk.c::disk_clone() will
* find our disk and match the sought for device.
* Set credits in our softc
*/
mdcreate_malloc(u);
return;
if (sc->cred)
crfree(sc->cred);
sc->cred = crdup(cred);
/*
* Horrible kludge to establish credentials for NFS XXX.
*/
if (sc->vnode) {
struct uio auio;
struct iovec aiov;
tmpbuf = malloc(sc->secsize, M_TEMP, M_WAITOK);
bzero(&auio, sizeof(auio));
aiov.iov_base = tmpbuf;
aiov.iov_len = sc->secsize;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_resid = aiov.iov_len;
vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY, curproc);
error = VOP_READ(sc->vnode, &auio, 0, sc->cred);
VOP_UNLOCK(sc->vnode, 0, curproc);
free(tmpbuf, M_TEMP);
}
return (error);
}
static int
mdcreate_vnode(struct md_ioctl *mdio, struct proc *p)
{
struct md_s *sc;
struct vattr vattr;
struct nameidata nd;
int error, flags;
if (mdio->md_options & MD_AUTOUNIT) {
sc = mdnew(-1);
mdio->md_unit = sc->unit;
} else {
sc = mdnew(mdio->md_unit);
}
if (sc == NULL)
return (EBUSY);
sc->type = MD_VNODE;
flags = FREAD|FWRITE;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, mdio->md_file, p);
error = vn_open(&nd, &flags, 0);
if (error) {
if (error != EACCES && error != EPERM && error != EROFS)
return (error);
flags &= ~FWRITE;
sc->flags |= MD_READONLY;
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, mdio->md_file, p);
error = vn_open(&nd, &flags, 0);
if (error)
return (error);
}
NDFREE(&nd, NDF_ONLY_PNBUF);
if (nd.ni_vp->v_type != VREG ||
(error = VOP_GETATTR(nd.ni_vp, &vattr, p->p_ucred, p))) {
VOP_UNLOCK(nd.ni_vp, 0, p);
(void) vn_close(nd.ni_vp, flags, p->p_ucred, p);
return (error ? error : EINVAL);
}
VOP_UNLOCK(nd.ni_vp, 0, p);
sc->secsize = DEV_BSIZE;
sc->vnode = nd.ni_vp;
/*
* If the size is specified, override the file attributes.
*/
if (mdio->md_size)
sc->nsect = mdio->md_size;
else
sc->nsect = vattr.va_size / sc->secsize; /* XXX: round up ? */
error = mdsetcred(sc, p->p_ucred);
if (error) {
(void) vn_close(nd.ni_vp, flags, p->p_ucred, p);
return(error);
}
mdinit(sc);
return (0);
}
static int
mddestroy(struct md_s *sc, struct md_ioctl *mdio, struct proc *p)
{
unsigned u;
if (sc->dev != NULL)
disk_destroy(sc->dev);
if (sc->vnode != NULL)
(void)vn_close(sc->vnode, sc->flags & MD_READONLY ? FREAD : (FREAD|FWRITE), sc->cred, p);
if (sc->cred != NULL)
crfree(sc->cred);
if (sc->object != NULL)
vm_pager_deallocate(sc->object);
if (sc->secp != NULL) {
for (u = 0; u < sc->nsecp; u++)
if ((uintptr_t)sc->secp[u] > 255)
FREE(sc->secp[u], M_MDSECT);
FREE(sc->secp, M_MD);
}
mddelete(sc);
return (0);
}
static int
mdcreate_swap(struct md_ioctl *mdio, struct proc *p)
{
int error;
struct md_s *sc;
if (mdio->md_options & MD_AUTOUNIT) {
sc = mdnew(-1);
mdio->md_unit = sc->unit;
} else {
sc = mdnew(mdio->md_unit);
}
if (sc == NULL)
return (EBUSY);
sc->type = MD_SWAP;
/*
* Range check. Disallow negative sizes or any size less then the
* size of a page. Then round to a page.
*/
if (mdio->md_size == 0)
return(EDOM);
/*
* Allocate an OBJT_SWAP object.
*
* sc_secsize is PAGE_SIZE'd
*
* mdio->size is in DEV_BSIZE'd chunks.
* Note the truncation.
*/
sc->secsize = PAGE_SIZE;
sc->nsect = mdio->md_size / (PAGE_SIZE / DEV_BSIZE);
sc->object = vm_pager_allocate(OBJT_SWAP, NULL, sc->secsize * (vm_offset_t)sc->nsect, VM_PROT_DEFAULT, 0);
if (mdio->md_options & MD_RESERVE) {
if (swap_pager_reserve(sc->object, 0, sc->nsect) < 0) {
vm_pager_deallocate(sc->object);
sc->object = NULL;
return(EDOM);
}
}
error = mdsetcred(sc, p->p_ucred);
if (error)
mddestroy(sc, mdio, p);
else
mdinit(sc);
return(error);
}
static int
mdctlioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
{
struct md_ioctl *mdio;
struct md_s *sc;
if (md_debug)
printf("mdctlioctl(%s %lx %p %x %p)\n",
devtoname(dev), cmd, addr, flags, p);
mdio = (struct md_ioctl *)addr;
if (mdio->md_type != MD_VNODE)
mdio->md_file[0] = '\0';
switch (cmd) {
case MDIOCATTACH:
printf("A: u %u t %d n %s s %u o %u\n", mdio->md_unit,
mdio->md_type, mdio->md_file, mdio->md_size,
mdio->md_options);
switch (mdio->md_type) {
case MD_MALLOC:
return(mdcreate_malloc(mdio));
case MD_PRELOAD:
return (EINVAL);
case MD_VNODE:
return(mdcreate_vnode(mdio, p));
case MD_SWAP:
return(mdcreate_swap(mdio, p));
default:
return (EINVAL);
}
case MDIOCDETACH:
printf("D: u %u t %d n %s s %u o %u\n", mdio->md_unit,
mdio->md_type, mdio->md_file, mdio->md_size,
mdio->md_options);
if (*mdio->md_file != '\0')
return(EINVAL);
if (mdio->md_size != 0)
return(EINVAL);
if (mdio->md_options != 0)
return(EINVAL);
sc = mdfind(mdio->md_unit);
if (sc == NULL)
return (ENOENT);
switch(sc->type) {
case MD_VNODE:
case MD_SWAP:
case MD_MALLOC:
return(mddestroy(sc, mdio, p));
default:
return (EOPNOTSUPP);
}
default:
return (ENOIOCTL);
};
return (ENOIOCTL);
}
static void
@ -452,9 +834,7 @@ md_drvinit(void *unused)
mdunits, name, len, ptr);
mdcreate_preload(ptr, len);
}
EVENTHANDLER_REGISTER(dev_clone, md_clone, 0, 999);
if (!devfs_present)
mdcreate_malloc(-1);
make_dev(&mdctl_cdevsw, 0xffff00ff, UID_ROOT, GID_WHEEL, 0600, "mdctl");
}
SYSINIT(mddev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR, md_drvinit,NULL)