#include <sys/param.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/buf_internal.h>
#include <sys/mount_internal.h>
#include <sys/namei.h>
#include <sys/vnode_internal.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/user.h>
#include <sys/malloc.h>
#include <sys/disk.h>
#include <sys/uio_internal.h>
#include <sys/resource.h>
#include <miscfs/specfs/specdev.h>
#include <vfs/vfs_support.h>
#include <sys/kdebug.h>
extern int isdisk(dev_t dev, int type);
extern dev_t chrtoblk(dev_t dev);
extern int iskmemdev(dev_t dev);
struct vnode *speclisth[SPECHSZ];
char devopn[] = "devopn";
char devio[] = "devio";
char devwait[] = "devwait";
char devin[] = "devin";
char devout[] = "devout";
char devioc[] = "devioc";
char devcls[] = "devcls";
#define VOPFUNC int (*)(void *)
int (**spec_vnodeop_p)(void *);
struct vnodeopv_entry_desc spec_vnodeop_entries[] = {
{ &vnop_default_desc, (VOPFUNC)vn_default_error },
{ &vnop_lookup_desc, (VOPFUNC)spec_lookup },
{ &vnop_create_desc, (VOPFUNC)err_create },
{ &vnop_mknod_desc, (VOPFUNC)err_mknod },
{ &vnop_open_desc, (VOPFUNC)spec_open },
{ &vnop_close_desc, (VOPFUNC)spec_close },
{ &vnop_access_desc, (VOPFUNC)spec_access },
{ &vnop_getattr_desc, (VOPFUNC)spec_getattr },
{ &vnop_setattr_desc, (VOPFUNC)spec_setattr },
{ &vnop_read_desc, (VOPFUNC)spec_read },
{ &vnop_write_desc, (VOPFUNC)spec_write },
{ &vnop_ioctl_desc, (VOPFUNC)spec_ioctl },
{ &vnop_select_desc, (VOPFUNC)spec_select },
{ &vnop_revoke_desc, (VOPFUNC)nop_revoke },
{ &vnop_mmap_desc, (VOPFUNC)err_mmap },
{ &vnop_fsync_desc, (VOPFUNC)spec_fsync },
{ &vnop_remove_desc, (VOPFUNC)err_remove },
{ &vnop_link_desc, (VOPFUNC)err_link },
{ &vnop_rename_desc, (VOPFUNC)err_rename },
{ &vnop_mkdir_desc, (VOPFUNC)err_mkdir },
{ &vnop_rmdir_desc, (VOPFUNC)err_rmdir },
{ &vnop_symlink_desc, (VOPFUNC)err_symlink },
{ &vnop_readdir_desc, (VOPFUNC)err_readdir },
{ &vnop_readlink_desc, (VOPFUNC)err_readlink },
{ &vnop_inactive_desc, (VOPFUNC)nop_inactive },
{ &vnop_reclaim_desc, (VOPFUNC)nop_reclaim },
{ &vnop_strategy_desc, (VOPFUNC)spec_strategy },
{ &vnop_pathconf_desc, (VOPFUNC)spec_pathconf },
{ &vnop_advlock_desc, (VOPFUNC)err_advlock },
{ &vnop_bwrite_desc, (VOPFUNC)spec_bwrite },
{ &vnop_pagein_desc, (VOPFUNC)err_pagein },
{ &vnop_pageout_desc, (VOPFUNC)err_pageout },
{ &vnop_copyfile_desc, (VOPFUNC)err_copyfile },
{ &vnop_blktooff_desc, (VOPFUNC)spec_blktooff },
{ &vnop_offtoblk_desc, (VOPFUNC)spec_offtoblk },
{ &vnop_blockmap_desc, (VOPFUNC)spec_blockmap },
{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc spec_vnodeop_opv_desc =
{ &spec_vnodeop_p, spec_vnodeop_entries };
static void set_blocksize(vnode_t, dev_t);
int
spec_lookup(struct vnop_lookup_args *ap)
{
*ap->a_vpp = NULL;
return (ENOTDIR);
}
static void
set_blocksize(struct vnode *vp, dev_t dev)
{
int (*size)(dev_t);
int rsize;
if ((major(dev) < nblkdev) && (size = bdevsw[major(dev)].d_psize)) {
rsize = (*size)(dev);
if (rsize <= 0)
vp->v_specsize = DEV_BSIZE;
else
vp->v_specsize = rsize;
}
else
vp->v_specsize = DEV_BSIZE;
}
void
set_fsblocksize(struct vnode *vp)
{
if (vp->v_type == VBLK) {
dev_t dev = (dev_t)vp->v_rdev;
int maj = major(dev);
if ((u_int)maj >= (u_int)nblkdev)
return;
vnode_lock(vp);
set_blocksize(vp, dev);
vnode_unlock(vp);
}
}
int
spec_open(struct vnop_open_args *ap)
{
struct proc *p = vfs_context_proc(ap->a_context);
kauth_cred_t cred = vfs_context_ucred(ap->a_context);
struct vnode *vp = ap->a_vp;
dev_t bdev, dev = (dev_t)vp->v_rdev;
int maj = major(dev);
int error;
if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV))
return (ENXIO);
switch (vp->v_type) {
case VCHR:
if ((u_int)maj >= (u_int)nchrdev)
return (ENXIO);
if (cred != FSCRED && (ap->a_mode & FWRITE)) {
if (securelevel >= 2 && isdisk(dev, VCHR))
return (EPERM);
if (securelevel >= 1) {
if ((bdev = chrtoblk(dev)) != NODEV && check_mountedon(bdev, VBLK, &error))
return (error);
if (iskmemdev(dev))
return (EPERM);
}
}
if (cdevsw[maj].d_type == D_TTY) {
vnode_lock(vp);
vp->v_flag |= VISTTY;
vnode_unlock(vp);
}
error = (*cdevsw[maj].d_open)(dev, ap->a_mode, S_IFCHR, p);
return (error);
case VBLK:
if ((u_int)maj >= (u_int)nblkdev)
return (ENXIO);
if (securelevel >= 2 && cred != FSCRED &&
(ap->a_mode & FWRITE) && bdevsw[maj].d_type == D_DISK)
return (EPERM);
if ( (error = vfs_mountedon(vp)) )
return (error);
error = (*bdevsw[maj].d_open)(dev, ap->a_mode, S_IFBLK, p);
if (!error) {
u_int64_t blkcnt;
u_int32_t blksize;
int setsize = 0;
u_int32_t size512 = 512;
if (!VNOP_IOCTL(vp, DKIOCGETBLOCKSIZE, (caddr_t)&blksize, 0, ap->a_context)) {
if (!VNOP_IOCTL(vp, DKIOCSETBLOCKSIZE, (caddr_t)&size512, FWRITE, ap->a_context)) {
if (!VNOP_IOCTL(vp, DKIOCGETBLOCKCOUNT, (caddr_t)&blkcnt, 0, ap->a_context)) {
setsize = 1;
}
}
if (VNOP_IOCTL(vp, DKIOCSETBLOCKSIZE, (caddr_t)&blksize, FWRITE, ap->a_context))
error = ENXIO;
}
vnode_lock(vp);
set_blocksize(vp, dev);
if (setsize)
vp->v_specdevsize = blkcnt * (u_int64_t)size512;
else
vp->v_specdevsize = (u_int64_t)0;
vnode_unlock(vp);
}
return(error);
default:
panic("spec_open type");
}
return (0);
}
int
spec_read(struct vnop_read_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct buf *bp;
daddr64_t bn, nextbn;
long bsize, bscale;
int devBlockSize=0;
int n, on;
int error = 0;
dev_t dev;
#if DIAGNOSTIC
if (uio->uio_rw != UIO_READ)
panic("spec_read mode");
if (UIO_SEG_IS_USER_SPACE(uio->uio_segflg))
panic("spec_read proc");
#endif
if (uio_resid(uio) == 0)
return (0);
switch (vp->v_type) {
case VCHR:
error = (*cdevsw[major(vp->v_rdev)].d_read)
(vp->v_rdev, uio, ap->a_ioflag);
return (error);
case VBLK:
if (uio->uio_offset < 0)
return (EINVAL);
dev = vp->v_rdev;
devBlockSize = vp->v_specsize;
if (devBlockSize > PAGE_SIZE)
return (EINVAL);
bscale = PAGE_SIZE / devBlockSize;
bsize = bscale * devBlockSize;
do {
on = uio->uio_offset % bsize;
bn = (daddr64_t)((uio->uio_offset / devBlockSize) &~ (bscale - 1));
if (vp->v_speclastr + bscale == bn) {
nextbn = bn + bscale;
error = buf_breadn(vp, bn, (int)bsize, &nextbn,
(int *)&bsize, 1, NOCRED, &bp);
} else
error = buf_bread(vp, bn, (int)bsize, NOCRED, &bp);
vnode_lock(vp);
vp->v_speclastr = bn;
vnode_unlock(vp);
n = bsize - buf_resid(bp);
if ((on > n) || error) {
if (!error)
error = EINVAL;
buf_brelse(bp);
return (error);
}
n = min((unsigned)(n - on), uio_resid(uio));
error = uiomove((char *)0 + buf_dataptr(bp) + on, n, uio);
if (n + on == bsize)
buf_markaged(bp);
buf_brelse(bp);
} while (error == 0 && uio_resid(uio) > 0 && n != 0);
return (error);
default:
panic("spec_read type");
}
return (0);
}
int
spec_write(struct vnop_write_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct buf *bp;
daddr64_t bn;
int bsize, blkmask, bscale;
int io_sync;
int io_size;
int devBlockSize=0;
int n, on;
int error = 0;
dev_t dev;
#if DIAGNOSTIC
if (uio->uio_rw != UIO_WRITE)
panic("spec_write mode");
if (UIO_SEG_IS_USER_SPACE(uio->uio_segflg))
panic("spec_write proc");
#endif
switch (vp->v_type) {
case VCHR:
error = (*cdevsw[major(vp->v_rdev)].d_write)
(vp->v_rdev, uio, ap->a_ioflag);
return (error);
case VBLK:
if (uio_resid(uio) == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
io_sync = (ap->a_ioflag & IO_SYNC);
io_size = uio_resid(uio);
dev = (vp->v_rdev);
devBlockSize = vp->v_specsize;
if (devBlockSize > PAGE_SIZE)
return(EINVAL);
bscale = PAGE_SIZE / devBlockSize;
blkmask = bscale - 1;
bsize = bscale * devBlockSize;
do {
bn = (daddr64_t)((uio->uio_offset / devBlockSize) &~ blkmask);
on = uio->uio_offset % bsize;
n = min((unsigned)(bsize - on), uio_resid(uio));
if (n == bsize &&
vp->v_specdevsize != (u_int64_t)0 &&
(uio->uio_offset + (u_int64_t)n) > vp->v_specdevsize) {
n = (uio->uio_offset + (u_int64_t)n) - vp->v_specdevsize;
}
if (n == bsize)
bp = buf_getblk(vp, bn, bsize, 0, 0, BLK_WRITE);
else
error = (int)buf_bread(vp, bn, bsize, NOCRED, &bp);
if (!error)
error = (int)buf_error(bp);
if (error) {
buf_brelse(bp);
return (error);
}
n = min(n, bsize - buf_resid(bp));
error = uiomove((char *)0 + buf_dataptr(bp) + on, n, uio);
if (error) {
buf_brelse(bp);
return (error);
}
buf_markaged(bp);
if (io_sync)
error = buf_bwrite(bp);
else {
if ((n + on) == bsize)
error = buf_bawrite(bp);
else
error = buf_bdwrite(bp);
}
} while (error == 0 && uio_resid(uio) > 0 && n != 0);
return (error);
default:
panic("spec_write type");
}
return (0);
}
int
spec_ioctl(struct vnop_ioctl_args *ap)
{
proc_t p = vfs_context_proc(ap->a_context);
dev_t dev = ap->a_vp->v_rdev;
switch (ap->a_vp->v_type) {
case VCHR:
return ((*cdevsw[major(dev)].d_ioctl)(dev, ap->a_command, ap->a_data,
ap->a_fflag, p));
case VBLK:
if (ap->a_command == 0 && (unsigned int)ap->a_data == B_TAPE) {
if (bdevsw[major(dev)].d_type == D_TAPE)
return (0);
else
return (1);
}
return ((*bdevsw[major(dev)].d_ioctl)(dev, ap->a_command, ap->a_data,
ap->a_fflag, p));
default:
panic("spec_ioctl");
}
return (0);
}
int
spec_select(struct vnop_select_args *ap)
{
proc_t p = vfs_context_proc(ap->a_context);
dev_t dev;
switch (ap->a_vp->v_type) {
default:
return (1);
case VCHR:
dev = ap->a_vp->v_rdev;
return (*cdevsw[major(dev)].d_select)(dev, ap->a_which, ap->a_wql, p);
}
}
int
spec_fsync_internal(vnode_t vp, int waitfor, __unused vfs_context_t context)
{
if (vp->v_type == VCHR)
return (0);
buf_flushdirtyblks(vp, waitfor == MNT_WAIT, 0, "spec_fsync");
return (0);
}
int
spec_fsync(struct vnop_fsync_args *ap)
{
return spec_fsync_internal(ap->a_vp, ap->a_waitfor, ap->a_context);
}
extern int hard_throttle_on_root;
void IOSleep(int);
#define LOWPRI_INITIAL_WINDOW_MSECS 100
#define LOWPRI_WINDOW_MSECS_INC 50
#define LOWPRI_MAX_WINDOW_MSECS 200
#define LOWPRI_MAX_WAITING_MSECS 200
#define LOWPRI_SLEEP_INTERVAL 5
struct _throttle_io_info_t {
struct timeval last_normal_IO_timestamp;
SInt32 numthreads_throttling;
};
struct _throttle_io_info_t _throttle_io_info[LOWPRI_MAX_NUM_DEV];
int lowpri_IO_initial_window_msecs = LOWPRI_INITIAL_WINDOW_MSECS;
int lowpri_IO_window_msecs_inc = LOWPRI_WINDOW_MSECS_INC;
int lowpri_max_window_msecs = LOWPRI_MAX_WINDOW_MSECS;
int lowpri_max_waiting_msecs = LOWPRI_MAX_WAITING_MSECS;
SYSCTL_INT(_debug, OID_AUTO, lowpri_IO_initial_window_msecs, CTLFLAG_RW, &lowpri_IO_initial_window_msecs, LOWPRI_INITIAL_WINDOW_MSECS, "");
SYSCTL_INT(_debug, OID_AUTO, lowpri_IO_window_inc, CTLFLAG_RW, &lowpri_IO_window_msecs_inc, LOWPRI_INITIAL_WINDOW_MSECS, "");
SYSCTL_INT(_debug, OID_AUTO, lowpri_max_window_msecs, CTLFLAG_RW, &lowpri_max_window_msecs, LOWPRI_INITIAL_WINDOW_MSECS, "");
SYSCTL_INT(_debug, OID_AUTO, lowpri_max_waiting_msecs, CTLFLAG_RW, &lowpri_max_waiting_msecs, LOWPRI_INITIAL_WINDOW_MSECS, "");
int throttle_io_will_be_throttled(int lowpri_window_msecs, size_t devbsdunit)
{
struct timeval elapsed;
int elapsed_msecs;
microuptime(&elapsed);
timevalsub(&elapsed, &_throttle_io_info[devbsdunit].last_normal_IO_timestamp);
elapsed_msecs = elapsed.tv_sec * 1000 + elapsed.tv_usec / 1000;
if (lowpri_window_msecs == -1) lowpri_window_msecs = lowpri_max_waiting_msecs;
return elapsed_msecs < lowpri_window_msecs;
}
void throttle_lowpri_io(boolean_t ok_to_sleep)
{
int i;
int max_try_num;
struct uthread *ut;
ut = get_bsdthread_info(current_thread());
if (ut->uu_lowpri_window == 0)
return;
max_try_num = lowpri_max_waiting_msecs / LOWPRI_SLEEP_INTERVAL * MAX(1, _throttle_io_info[ut->uu_devbsdunit].numthreads_throttling);
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 97)) | DBG_FUNC_START,
ut->uu_lowpri_window, 0, 0, 0, 0);
if (ok_to_sleep == TRUE) {
for (i=0; i<max_try_num; i++) {
if (throttle_io_will_be_throttled(ut->uu_lowpri_window, ut->uu_devbsdunit)) {
IOSleep(LOWPRI_SLEEP_INTERVAL);
} else {
break;
}
}
}
KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 97)) | DBG_FUNC_END,
ut->uu_lowpri_window, i*5, 0, 0, 0);
SInt32 oldValue;
oldValue = OSDecrementAtomic(&_throttle_io_info[ut->uu_devbsdunit].numthreads_throttling);
ut->uu_lowpri_window = 0;
if (oldValue <= 0) {
panic("%s: numthreads negative", __func__);
}
}
int throttle_get_io_policy(struct uthread **ut)
{
int policy = IOPOL_DEFAULT;
proc_t p = current_proc();
*ut = get_bsdthread_info(current_thread());
if (p != NULL)
policy = p->p_iopol_disk;
if (*ut != NULL) {
if ((*ut)->uu_iopol_disk != IOPOL_DEFAULT)
policy = (*ut)->uu_iopol_disk;
}
return policy;
}
int
spec_strategy(struct vnop_strategy_args *ap)
{
buf_t bp;
int bflags;
dev_t bdev;
bp = ap->a_bp;
bdev = buf_device(bp);
bflags = buf_flags(bp);
if (kdebug_enable) {
int code = 0;
if (bflags & B_READ)
code |= DKIO_READ;
if (bflags & B_ASYNC)
code |= DKIO_ASYNC;
if (bflags & B_META)
code |= DKIO_META;
else if (bflags & B_PAGEIO)
code |= DKIO_PAGING;
KERNEL_DEBUG_CONSTANT(FSDBG_CODE(DBG_DKRW, code) | DBG_FUNC_NONE,
(unsigned int)bp, bdev, (int)buf_blkno(bp), buf_count(bp), 0);
}
if (((bflags & (B_PAGEIO | B_READ)) == (B_PAGEIO | B_READ)) &&
(buf_vnode(bp)->v_mount->mnt_kern_flag & MNTK_ROOTDEV))
hard_throttle_on_root = 1;
if (lowpri_IO_initial_window_msecs) {
struct uthread *ut;
int policy;
int is_throttleable_io = 0;
int is_passive_io = 0;
size_t devbsdunit;
SInt32 oldValue;
policy = throttle_get_io_policy(&ut);
switch (policy) {
case IOPOL_DEFAULT:
case IOPOL_NORMAL:
break;
case IOPOL_THROTTLE:
is_throttleable_io = 1;
break;
case IOPOL_PASSIVE:
is_passive_io = 1;
break;
default:
printf("unknown I/O policy %d", policy);
break;
}
if (!is_throttleable_io && ISSET(bflags, B_PASSIVE))
is_passive_io |= 1;
if (buf_vnode(bp)->v_mount != NULL)
devbsdunit = buf_vnode(bp)->v_mount->mnt_devbsdunit;
else
devbsdunit = LOWPRI_MAX_NUM_DEV - 1;
if (!is_throttleable_io) {
if (!is_passive_io){
microuptime(&_throttle_io_info[devbsdunit].last_normal_IO_timestamp);
}
} else {
if (ut->uu_lowpri_window == 0) {
ut->uu_devbsdunit = devbsdunit;
oldValue = OSIncrementAtomic(&_throttle_io_info[devbsdunit].numthreads_throttling);
if (oldValue < 0) {
panic("%s: numthreads negative", __func__);
}
ut->uu_lowpri_window = lowpri_IO_initial_window_msecs;
ut->uu_lowpri_window += lowpri_IO_window_msecs_inc * oldValue;
} else {
if (ut->uu_devbsdunit != devbsdunit) { OSDecrementAtomic(&_throttle_io_info[ut->uu_devbsdunit].numthreads_throttling);
OSIncrementAtomic(&_throttle_io_info[devbsdunit].numthreads_throttling);
ut->uu_devbsdunit = devbsdunit;
}
int numthreads = MAX(1, _throttle_io_info[devbsdunit].numthreads_throttling);
ut->uu_lowpri_window += lowpri_IO_window_msecs_inc * numthreads;
if (ut->uu_lowpri_window > lowpri_max_window_msecs * numthreads)
ut->uu_lowpri_window = lowpri_max_window_msecs * numthreads;
}
}
}
(*bdevsw[major(bdev)].d_strategy)(bp);
return (0);
}
int
spec_blockmap(__unused struct vnop_blockmap_args *ap)
{
return (ENOTSUP);
}
int
spec_close(struct vnop_close_args *ap)
{
struct vnode *vp = ap->a_vp;
dev_t dev = vp->v_rdev;
int (*devclose)(dev_t, int, int, struct proc *);
int mode, error;
int flags = ap->a_fflag;
struct proc *p = vfs_context_proc(ap->a_context);
struct session *sessp;
switch (vp->v_type) {
case VCHR:
sessp = proc_session(p);
if (sessp != SESSION_NULL) {
if ((vcount(vp) == 2) &&
(vp == sessp->s_ttyvp)) {
session_lock(sessp);
sessp->s_ttyvp = NULL;
sessp->s_ttyvid = 0;
sessp->s_ttyp = NULL;
sessp->s_ttypgrpid = NO_PID;
session_unlock(sessp);
vnode_rele(vp);
}
session_rele(sessp);
}
devclose = cdevsw[major(dev)].d_close;
mode = S_IFCHR;
if ((flags & IO_REVOKE) != 0)
break;
if (vcount(vp) > 1)
return (0);
break;
case VBLK:
#ifdef DEVFS_IMPLEMENTS_LOCKING
if ((error = spec_fsync_internal(vp, MNT_WAIT, ap->a_context)))
return (error);
error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0);
if (error)
return (error);
if (vcount(vp) > 0)
return (0);
#else
if (vcount(vp) > 0)
return (0);
if ((error = spec_fsync_internal(vp, MNT_WAIT, ap->a_context)))
return (error);
error = buf_invalidateblks(vp, BUF_WRITE_DATA, 0, 0);
if (error)
return (error);
#endif
devclose = bdevsw[major(dev)].d_close;
mode = S_IFBLK;
break;
default:
panic("spec_close: not special");
return(EBADF);
}
return ((*devclose)(dev, flags, mode, p));
}
int
spec_pathconf(struct vnop_pathconf_args *ap)
{
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_MAX_CANON:
*ap->a_retval = MAX_CANON;
return (0);
case _PC_MAX_INPUT:
*ap->a_retval = MAX_INPUT;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 200112;
return (0);
case _PC_VDISABLE:
*ap->a_retval = _POSIX_VDISABLE;
return (0);
default:
return (EINVAL);
}
}
int
spec_ebadf(__unused void *dummy)
{
return (EBADF);
}
int
spec_blktooff(struct vnop_blktooff_args *ap)
{
struct vnode *vp = ap->a_vp;
switch (vp->v_type) {
case VCHR:
*ap->a_offset = (off_t)-1;
return (ENOTSUP);
case VBLK:
printf("spec_blktooff: not implemented for VBLK\n");
*ap->a_offset = (off_t)-1;
return (ENOTSUP);
default:
panic("spec_blktooff type");
}
return (0);
}
int
spec_offtoblk(struct vnop_offtoblk_args *ap)
{
struct vnode *vp = ap->a_vp;
switch (vp->v_type) {
case VCHR:
*ap->a_lblkno = (daddr64_t)-1;
return (ENOTSUP);
case VBLK:
printf("spec_offtoblk: not implemented for VBLK\n");
*ap->a_lblkno = (daddr64_t)-1;
return (ENOTSUP);
default:
panic("spec_offtoblk type");
}
return (0);
}