f6dd28dc27
a single device to be opened multiple times concurrently unfortunately isn't sufficient with ZFS. This is due to the fact, that ZFS may open different partitions of a single device simultaneously. So the best we can do in this case is to cache the lastly used device path and close and open devices in ofwd_strategy() as needed. PR: 165025 Submitted by: Gavin Mu MFC after: 1 week
169 lines
4.2 KiB
C
169 lines
4.2 KiB
C
/*-
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* Copyright (C) 2000 Benno Rice.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Disk I/O routines using Open Firmware
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*/
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <machine/stdarg.h>
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#include <stand.h>
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#include "bootstrap.h"
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#include "libofw.h"
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static int ofwd_init(void);
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static int ofwd_strategy(void *devdata, int flag, daddr_t dblk,
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size_t size, char *buf, size_t *rsize);
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static int ofwd_open(struct open_file *f, ...);
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static int ofwd_close(struct open_file *f);
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static int ofwd_ioctl(struct open_file *f, u_long cmd, void *data);
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static void ofwd_print(int verbose);
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struct devsw ofwdisk = {
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"block",
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DEVT_DISK,
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ofwd_init,
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ofwd_strategy,
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ofwd_open,
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ofwd_close,
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ofwd_ioctl,
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ofwd_print
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};
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/*
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* We're not guaranteed to be able to open a device more than once and there
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* is no OFW standard method to determine whether a device is already opened.
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* Opening a device multiple times simultaneously happens to work with most
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* OFW block device drivers but triggers a trap with at least the driver for
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* the on-board controllers of Sun Fire V100 and Ultra 1. Upper layers and MI
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* code expect to be able to open a device more than once however. Given that
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* different partitions of the same device might be opened at the same time as
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* done by ZFS, we can't generally just keep track of the opened devices and
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* reuse the instance handle when asked to open an already opened device. So
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* the best we can do is to cache the lastly used device path and close and
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* open devices in ofwd_strategy() as needed.
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*/
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static struct ofw_devdesc *kdp;
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static int
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ofwd_init(void)
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{
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return (0);
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}
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static int
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ofwd_strategy(void *devdata, int flag __unused, daddr_t dblk, size_t size,
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char *buf, size_t *rsize)
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{
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struct ofw_devdesc *dp = (struct ofw_devdesc *)devdata;
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daddr_t pos;
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int n;
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if (dp != kdp) {
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if (kdp != NULL) {
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#if !defined(__powerpc__)
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OF_close(kdp->d_handle);
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#endif
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kdp = NULL;
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}
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if ((dp->d_handle = OF_open(dp->d_path)) == -1)
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return (ENOENT);
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kdp = dp;
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}
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pos = dblk * 512;
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do {
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if (OF_seek(dp->d_handle, pos) < 0)
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return (EIO);
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n = OF_read(dp->d_handle, buf, size);
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if (n < 0 && n != -2)
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return (EIO);
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} while (n == -2);
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*rsize = size;
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return (0);
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}
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static int
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ofwd_open(struct open_file *f, ...)
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{
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struct ofw_devdesc *dp;
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va_list vl;
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va_start(vl, f);
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dp = va_arg(vl, struct ofw_devdesc *);
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va_end(vl);
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if (dp != kdp) {
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if (kdp != NULL) {
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OF_close(kdp->d_handle);
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kdp = NULL;
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}
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if ((dp->d_handle = OF_open(dp->d_path)) == -1) {
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printf("%s: Could not open %s\n", __func__,
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dp->d_path);
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return (ENOENT);
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}
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kdp = dp;
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}
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return (0);
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}
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static int
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ofwd_close(struct open_file *f)
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{
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struct ofw_devdesc *dev = f->f_devdata;
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if (dev == kdp) {
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#if !defined(__powerpc__)
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OF_close(dev->d_handle);
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#endif
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kdp = NULL;
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}
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return (0);
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}
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static int
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ofwd_ioctl(struct open_file *f __unused, u_long cmd __unused,
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void *data __unused)
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{
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return (EINVAL);
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}
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static void
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ofwd_print(int verbose __unused)
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{
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}
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