summaryrefslogtreecommitdiff
path: root/sys/dev/slice/slice_device.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/dev/slice/slice_device.c')
-rw-r--r--sys/dev/slice/slice_device.c403
1 files changed, 0 insertions, 403 deletions
diff --git a/sys/dev/slice/slice_device.c b/sys/dev/slice/slice_device.c
deleted file mode 100644
index c861941328cb..000000000000
--- a/sys/dev/slice/slice_device.c
+++ /dev/null
@@ -1,403 +0,0 @@
-/*-
- * Copyright (C) 1997,1998 Julian Elischer. All rights reserved.
- * julian@freebsd.org
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
- * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE HOLDER OR CONTRIBUTORS BE LIABLE FOR
- * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $Id: slice_device.c,v 1.6 1998/06/07 18:44:03 sos Exp $
- */
-#define DIAGNOSTIC 1
-#include "opt_hw_wdog.h"
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/kernel.h> /* SYSINIT stuff */
-#include <sys/conf.h> /* cdevsw stuff */
-#include <sys/malloc.h> /* malloc region definitions */
-#include <sys/buf.h> /* bufs for describing IO */
-#include <sys/fcntl.h> /* file open modes etc. */
-#include <sys/queue.h> /* standard queue macros */
-#include <sys/stat.h> /* S_IFBLK, S_IFMT etc. */
-#include <sys/devfsext.h> /* DEVFS defintitions */
-#include <dev/slice/slice.h> /* temporary location */
-
-#include <vm/vm_param.h>
-#include <machine/md_var.h>
-#include <i386/i386/cons.h>
-
-/* Function prototypes (these should all be static except for slicenew()) */
-static d_open_t slcdevopen;
-static d_read_t slcdevread;
-static d_write_t slcdevwrite;
-static d_close_t slcdevclose;
-static d_ioctl_t slcdevioctl;
-static d_dump_t slcdevdump;
-static d_psize_t slcdevsize;
-static d_strategy_t slcdevstrategy;
-
-#define BDEV_MAJOR 14
-#define CDEV_MAJOR 20
-
-static struct cdevsw slice_cdevsw = {
- slcdevopen, slcdevclose, slcdevread, slcdevwrite,
- slcdevioctl, nostop, nullreset, nodevtotty,
- seltrue, nommap, slcdevstrategy, "slice",
- NULL, -1, slcdevdump, slcdevsize,
- D_DISK, 0, -1 };
-
-
-#define UNIT_HASH_SIZE 64
-LIST_HEAD(slice_bucket, slice) hash_table[UNIT_HASH_SIZE - 1];
-
-/*
- * Now for some driver initialisation. Occurs ONCE during boot (very early).
- */
-static void
-slice_drvinit(void *unused)
-{
- int i;
-
- /*
- * add bdevsw and cdevsw entries
- */
- cdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &slice_cdevsw);
-
- /*
- * clear out the hash table
- */
- for (i = 0; i < UNIT_HASH_SIZE; i++) {
- LIST_INIT(hash_table + i);
- }
-}
-
-SYSINIT(slicedev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE + CDEV_MAJOR,
- slice_drvinit, NULL);
-
-static int nextunit = 0;
-
-void
-slice_add_device(sl_p slice)
-{
- int unit = nextunit++;
- char *name = slice->name;
-RR;
- slice->minor = makedev(0,
- (((unit << 8) & 0xffff0000) | (unit & 0x000000ff)));
- /*
- * put it on the hash chain for it's bucket so we can find it again
- * later.
- */
- LIST_INSERT_HEAD(hash_table + (slice->minor % UNIT_HASH_SIZE),
- slice, hash_list);
- /*
- * Add an entry in the devfs for it. Possibly should happen later.
- */
- slice->devfs_ctoken = devfs_add_devswf(&slice_cdevsw, unit, DV_CHR,
- UID_ROOT, GID_OPERATOR, 0600, "r%s", name ? name : "-");
- slice->devfs_btoken = devfs_add_devswf(&slice_cdevsw, unit, DV_BLK,
- UID_ROOT, GID_OPERATOR, 0600, "%s", name ? name : "-");
- /* XXX link this node into upper list of caller */
-}
-
-/*
- * Given a minor number, find the slice which the operations are destined.
- * When DEVFS DDEV devices are enabled this is bypassed entirely.
- */
-static struct slice *
-minor_to_slice(unsigned int minor)
-{
- int hash = minor % UNIT_HASH_SIZE;
- struct slice *slice;
-
- slice = (hash_table + hash)->lh_first;
- while (slice) {
- if (slice->minor == minor) {
- return (slice);
- }
- slice = slice->hash_list.le_next;
- }
- return (NULL);
-}
-
-
-
-int
-slcdevioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc * p)
-{
- sl_p slice = minor_to_slice(minor(dev));
- int error = 0;
-
-RR;
-
- /*
- * Look for only some generic "inherrited" ioctls that apply to all
- * disk-like devices otherwise pass it down to the previous handler
- */
-
- switch (cmd) {
- /*
- * At present there are none, but eventually there would be
- * something that returns the basic partition parameters.
- * Whether this would be in the form of a disklabel or
- * similar I have not yet decided.
- */
- default:
- if (slice->handler_down->ioctl) {
- error = (*slice->handler_down->ioctl)
- (slice->private_down, cmd, data, flag, p);
- } else {
- error = ENOTTY;
- }
- if (error) {
- /*
- * If no disklabel was returned, let's make
- * up something that will satisfy the system's
- * need for a disklabel to mount an ffs on.
- * Don't overwrite error unless we get a dummy.
- * let the called routine decide
- * if it can handle any ioctl.
- */
- if (dkl_dummy_ioctl(slice, cmd, data, flag, p) == 0) {
- error = 0;
- }
- }
- break;
- }
- return (error);
-}
-
-/*
- * You also need read, write, open, close routines. This should get you
- * started.
- * The open MIGHT allow the caller to proceed if it is a READ
- * mode, and it is open at a higher layer.
- * All Accesses would have to be checked for READ
- * as the system doesn't enforce this at this time.
- */
-static int
-slcdevopen(dev_t dev, int flags, int mode, struct proc * p)
-{
- sl_p slice = minor_to_slice(minor(dev));
- int error;
-
-RR;
- if (slice == NULL)
- return (ENXIO);
-#if 1 /* the hack */
- if ((mode & S_IFMT) == S_IFBLK) {
- /*
- * XXX Because a mount -u does not re-open the device
- * The hack here, is to always open block devices
- * in full read/write mode. Eventually, if DEVFS
- * becomes ubiquitous, VOP to do a file upgrade
- * might be implemented. Other Filesystems need
- * not implement it..
- * THIS SHOULD BE DONE IN slice_device.c
- */
- flags |= FWRITE;
- }
-#endif /* the hack */
- return (sliceopen(slice, flags, mode, p, SLW_DEVICE));
-}
-
-static int
-slcdevclose(dev_t dev, int flags, int mode, struct proc * p)
-{
- sl_p slice = minor_to_slice(minor(dev));
-RR;
-#ifdef DIAGNOSTICX
- if ((flags & (FWRITE | FREAD)) != 0) {
- printf("sliceclose called with non 0 flags\n");
- }
-#endif
- /*
- * Close is just an open for non-read/nonwrite in this context.
- */
- sliceopen(slice, 0, mode, p, SLW_DEVICE);
- return(0);
-}
-
-static int
-slcdevsize(dev_t dev)
-{
- sl_p slice = minor_to_slice(minor(dev));
-
-RR;
- if (slice == NULL)
- return (-1);
-
-#if 0
- return (slice->limits.slicesize / slice->limits.blksize);
-#else
- return (slice->limits.slicesize / 512);
-#endif
-}
-
-
-static int
-slcdevread(dev_t dev, struct uio *uio, int ioflag)
-{
- return (physio(slcdevstrategy, NULL, dev, 1, minphys, uio));
-}
-
-static int
-slcdevwrite(dev_t dev, struct uio *uio, int ioflag)
-{
- return (physio(slcdevstrategy, NULL, dev, 0, minphys, uio));
-}
-static dev_t cdevnum, bdevnum;
-/*
- * Read/write routine for a buffer. Finds the proper unit, range checks
- * arguments, and schedules the transfer. Does not wait for the transfer to
- * complete. Multi-page transfers are supported. All I/O requests must be a
- * multiple of a sector in length.
- */
-void
-slcdevstrategy(struct buf * bp)
-{
- sl_p slice = minor_to_slice(minor(bp->b_dev));
- u_int64_t start, end;
- u_int32_t blksize;
- daddr_t blkno;
- int s;
-
-RR;
- if (slice == NULL) {
- bp->b_error = ENXIO;
- goto bad;
- }
- blksize = slice->limits.blksize;
- /* Check we are going to be able to do this kind of transfer */
- /* Check the start point too if DEV_BSIZE != reallity */
- if (bp->b_blkno < 0) {
- Debugger("Slice code got negative blocknumber");
- bp->b_error = EINVAL;
- goto bad;
- }
- start = (u_int64_t)bp->b_blkno * DEV_BSIZE;
- if (blksize != DEV_BSIZE) {
- if ((start % blksize) != 0) {
- Debugger("slice: request not on block boundary.");
- bp->b_error = EINVAL;
- goto bad;
- }
- blkno = start / blksize;
- } else {
- blkno = bp->b_blkno;
- }
-
- if ((bp->b_bcount % blksize) != 0) {
- printf("bcount = %d, blksize= %d(%d)\n",
- bp->b_bcount, blksize,
- slice->limits.blksize);
- Debugger("slice: request not multile of blocksize.");
- bp->b_error = EINVAL;
- goto bad;
- }
- /*
- * Do bounds checking, adjust transfer, and set b_pblkno.
- */
- bp->b_pblkno = blkno;
- end = start + (u_int64_t)bp->b_bcount; /* first byte BEYOND the IO */
-
- /*
- * Handle the cases near or beyond the end of the slice. Assumes IO
- * is < 2^63 bytes long. (pretty safe)
- */
- if (end > slice->limits.slicesize) {
- int64_t size;
- size = slice->limits.slicesize - start;
- /*
- * if exactly on end of slice, return EOF
- */
- if ((size == 0) && (bp->b_flags & B_READ)) {
- printf("slice: at end of slice.");
- bp->b_resid = bp->b_bcount;
- goto done;
- }
- if (size <= 0) {
- printf("slice: beyond end of slice.");
- bp->b_error = EINVAL;
- goto bad;
- }
- bp->b_bcount = size;
- }
- sliceio(slice, bp, SLW_DEVICE);
- return;
-
-done:
- s = splbio();
- /* toss transfer, we're done early */
- biodone(bp);
- splx(s);
- return;
-bad:
- bp->b_flags |= B_ERROR;
- goto done;
-
-}
-
-void
-slice_remove_device(sl_p slice)
-{
- /*
- * Remove the devfs entry, which revokes the vnode etc. XXX if
- * handler has madde more, we should tell it too. e.g. floppy driver
- * does this.
- */
-RR;
- devfs_remove_dev(slice->devfs_btoken);
- devfs_remove_dev(slice->devfs_ctoken);
-
- /*
- * Remove it from the hashtable.
- */
- LIST_REMOVE(slice, hash_list);
-}
-
-static int
-slcdevdump(dev_t dev)
-{
- sl_p slice = minor_to_slice(minor(dev));
- static int slcdoingdump = 0;
- int32_t num, nblocks, lo;
-RR;
- if (!slice || !(slice->flags & SLF_OPEN_DEV_WR) ||
- !slice->handler_down->dump)
- return (ENXIO);
-
- /* Toss any characters present prior to dump. */
- while (cncheckc() != -1)
- ;
-
- if (slcdoingdump)
- return (EFAULT);
-
- num = (int32_t)(Maxmem * PAGE_SIZE / slice->limits.blksize);
- nblocks = (int32_t)(slice->limits.slicesize / slice->limits.blksize);
- lo = dumplo * DEV_BSIZE / slice->limits.blksize;
- if (lo < 0 || lo + num > nblocks)
- return (EINVAL);
-
- slcdoingdump = 1;
- return (*slice->handler_down->dump)(slice->private_down, lo, num);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-09 18:57:47 +0000