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87ed2b7f5a
The block cache implementation in loader has proven to be almost useless, and in worst case even slowing down the disk reads due to insufficient cache size and extra memory copy. Also the current cache implementation does not cache reads from CDs, or work with zfs built on top of multiple disks. Instead of an LRU, this code uses a simple hash (O(1) read from cache), and instead of a single global cache, a separate cache per block device. The cache also implements limited read-ahead to increase performance. To simplify read ahead management, the read ahead will not wrap over bcache end, so in worst case, single block physical read will be performed to fill the last block in bcache. Booting from a virtual CD over IPMI: 0ms latency, before: 27 second, after: 7 seconds 60ms latency, before: over 12 minutes, after: under 5 minutes. Submitted by: Toomas Soome <tsoome@me.com> Reviewed by: delphij (previous version), emaste (previous version) Relnotes: yes Differential Revision: https://reviews.freebsd.org/D4713
168 lines
4.3 KiB
C
168 lines
4.3 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 offset, 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 offset,
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size_t size, 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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