702 lines
18 KiB
C
702 lines
18 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2009-2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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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 THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h> /* powerof2() */
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#include <sys/queue.h>
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#include <bitstring.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pjdlog.h>
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#include "activemap.h"
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#ifndef PJDLOG_ASSERT
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#include <assert.h>
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#define PJDLOG_ASSERT(...) assert(__VA_ARGS__)
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#endif
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#define ACTIVEMAP_MAGIC 0xac71e4
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struct activemap {
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int am_magic; /* Magic value. */
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off_t am_mediasize; /* Media size in bytes. */
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uint32_t am_extentsize; /* Extent size in bytes,
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must be power of 2. */
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uint8_t am_extentshift;/* 2 ^ extentbits == extentsize */
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int am_nextents; /* Number of extents. */
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size_t am_mapsize; /* Bitmap size in bytes. */
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uint16_t *am_memtab; /* An array that holds number of pending
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writes per extent. */
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bitstr_t *am_diskmap; /* On-disk bitmap of dirty extents. */
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bitstr_t *am_memmap; /* In-memory bitmap of dirty extents. */
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size_t am_diskmapsize; /* Map size rounded up to sector size. */
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uint64_t am_ndirty; /* Number of dirty regions. */
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bitstr_t *am_syncmap; /* Bitmap of extents to sync. */
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off_t am_syncoff; /* Next synchronization offset. */
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TAILQ_HEAD(skeepdirty, keepdirty) am_keepdirty; /* List of extents that
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we keep dirty to reduce bitmap
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updates. */
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int am_nkeepdirty; /* Number of am_keepdirty elements. */
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int am_nkeepdirty_limit; /* Maximum number of am_keepdirty
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elements. */
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};
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struct keepdirty {
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int kd_extent;
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TAILQ_ENTRY(keepdirty) kd_next;
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};
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/*
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* Helper function taken from sys/systm.h to calculate extentshift.
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*/
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static uint32_t
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bitcount32(uint32_t x)
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{
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x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
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x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
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x = (x + (x >> 4)) & 0x0f0f0f0f;
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x = (x + (x >> 8));
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x = (x + (x >> 16)) & 0x000000ff;
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return (x);
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}
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static __inline int
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off2ext(const struct activemap *amp, off_t offset)
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{
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int extent;
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PJDLOG_ASSERT(offset >= 0 && offset < amp->am_mediasize);
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extent = (offset >> amp->am_extentshift);
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PJDLOG_ASSERT(extent >= 0 && extent < amp->am_nextents);
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return (extent);
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}
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static __inline off_t
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ext2off(const struct activemap *amp, int extent)
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{
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off_t offset;
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PJDLOG_ASSERT(extent >= 0 && extent < amp->am_nextents);
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offset = ((off_t)extent << amp->am_extentshift);
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PJDLOG_ASSERT(offset >= 0 && offset < amp->am_mediasize);
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return (offset);
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}
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/*
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* Function calculates number of requests needed to synchronize the given
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* extent.
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*/
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static __inline int
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ext2reqs(const struct activemap *amp, int ext)
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{
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off_t left;
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if (ext < amp->am_nextents - 1)
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return (((amp->am_extentsize - 1) / MAXPHYS) + 1);
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PJDLOG_ASSERT(ext == amp->am_nextents - 1);
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left = amp->am_mediasize % amp->am_extentsize;
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if (left == 0)
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left = amp->am_extentsize;
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return (((left - 1) / MAXPHYS) + 1);
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}
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/*
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* Initialize activemap structure and allocate memory for internal needs.
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* Function returns 0 on success and -1 if any of the allocations failed.
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*/
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int
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activemap_init(struct activemap **ampp, uint64_t mediasize, uint32_t extentsize,
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uint32_t sectorsize, uint32_t keepdirty)
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{
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struct activemap *amp;
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PJDLOG_ASSERT(ampp != NULL);
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PJDLOG_ASSERT(mediasize > 0);
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PJDLOG_ASSERT(extentsize > 0);
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PJDLOG_ASSERT(powerof2(extentsize));
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PJDLOG_ASSERT(sectorsize > 0);
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PJDLOG_ASSERT(powerof2(sectorsize));
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PJDLOG_ASSERT(keepdirty > 0);
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amp = malloc(sizeof(*amp));
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if (amp == NULL)
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return (-1);
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amp->am_mediasize = mediasize;
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amp->am_nkeepdirty_limit = keepdirty;
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amp->am_extentsize = extentsize;
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amp->am_extentshift = bitcount32(extentsize - 1);
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amp->am_nextents = ((mediasize - 1) / extentsize) + 1;
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amp->am_mapsize = bitstr_size(amp->am_nextents);
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amp->am_diskmapsize = roundup2(amp->am_mapsize, sectorsize);
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amp->am_ndirty = 0;
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amp->am_syncoff = -2;
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TAILQ_INIT(&->am_keepdirty);
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amp->am_nkeepdirty = 0;
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amp->am_memtab = calloc(amp->am_nextents, sizeof(amp->am_memtab[0]));
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amp->am_diskmap = calloc(1, amp->am_diskmapsize);
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amp->am_memmap = bit_alloc(amp->am_nextents);
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amp->am_syncmap = bit_alloc(amp->am_nextents);
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/*
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* Check to see if any of the allocations above failed.
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*/
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if (amp->am_memtab == NULL || amp->am_diskmap == NULL ||
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amp->am_memmap == NULL || amp->am_syncmap == NULL) {
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if (amp->am_memtab != NULL)
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free(amp->am_memtab);
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if (amp->am_diskmap != NULL)
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free(amp->am_diskmap);
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if (amp->am_memmap != NULL)
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free(amp->am_memmap);
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if (amp->am_syncmap != NULL)
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free(amp->am_syncmap);
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amp->am_magic = 0;
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free(amp);
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errno = ENOMEM;
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return (-1);
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}
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amp->am_magic = ACTIVEMAP_MAGIC;
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*ampp = amp;
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return (0);
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}
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static struct keepdirty *
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keepdirty_find(struct activemap *amp, int extent)
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{
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struct keepdirty *kd;
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TAILQ_FOREACH(kd, &->am_keepdirty, kd_next) {
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if (kd->kd_extent == extent)
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break;
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}
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return (kd);
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}
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static bool
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keepdirty_add(struct activemap *amp, int extent)
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{
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struct keepdirty *kd;
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kd = keepdirty_find(amp, extent);
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if (kd != NULL) {
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/*
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* Only move element at the beginning.
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*/
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TAILQ_REMOVE(&->am_keepdirty, kd, kd_next);
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TAILQ_INSERT_HEAD(&->am_keepdirty, kd, kd_next);
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return (false);
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}
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/*
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* Add new element, but first remove the most unused one if
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* we have too many.
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*/
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if (amp->am_nkeepdirty >= amp->am_nkeepdirty_limit) {
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kd = TAILQ_LAST(&->am_keepdirty, skeepdirty);
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PJDLOG_ASSERT(kd != NULL);
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TAILQ_REMOVE(&->am_keepdirty, kd, kd_next);
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amp->am_nkeepdirty--;
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PJDLOG_ASSERT(amp->am_nkeepdirty > 0);
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}
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if (kd == NULL)
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kd = malloc(sizeof(*kd));
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/* We can ignore allocation failure. */
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if (kd != NULL) {
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kd->kd_extent = extent;
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amp->am_nkeepdirty++;
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TAILQ_INSERT_HEAD(&->am_keepdirty, kd, kd_next);
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}
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return (true);
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}
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static void
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keepdirty_fill(struct activemap *amp)
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{
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struct keepdirty *kd;
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TAILQ_FOREACH(kd, &->am_keepdirty, kd_next)
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bit_set(amp->am_diskmap, kd->kd_extent);
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}
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static void
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keepdirty_free(struct activemap *amp)
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{
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struct keepdirty *kd;
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while ((kd = TAILQ_FIRST(&->am_keepdirty)) != NULL) {
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TAILQ_REMOVE(&->am_keepdirty, kd, kd_next);
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amp->am_nkeepdirty--;
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free(kd);
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}
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PJDLOG_ASSERT(amp->am_nkeepdirty == 0);
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}
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/*
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* Function frees resources allocated by activemap_init() function.
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*/
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void
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activemap_free(struct activemap *amp)
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{
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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amp->am_magic = 0;
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keepdirty_free(amp);
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free(amp->am_memtab);
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free(amp->am_diskmap);
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free(amp->am_memmap);
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free(amp->am_syncmap);
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}
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/*
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* Function should be called before we handle write requests. It updates
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* internal structures and returns true if on-disk metadata should be updated.
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*/
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bool
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activemap_write_start(struct activemap *amp, off_t offset, off_t length)
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{
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bool modified;
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off_t end;
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int ext;
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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PJDLOG_ASSERT(length > 0);
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modified = false;
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end = offset + length - 1;
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for (ext = off2ext(amp, offset); ext <= off2ext(amp, end); ext++) {
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/*
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* If the number of pending writes is increased from 0,
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* we have to mark the extent as dirty also in on-disk bitmap.
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* By returning true we inform the caller that on-disk bitmap
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* was modified and has to be flushed to disk.
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*/
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if (amp->am_memtab[ext]++ == 0) {
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PJDLOG_ASSERT(!bit_test(amp->am_memmap, ext));
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bit_set(amp->am_memmap, ext);
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amp->am_ndirty++;
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}
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if (keepdirty_add(amp, ext))
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modified = true;
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}
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return (modified);
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}
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/*
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* Function should be called after receiving write confirmation. It updates
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* internal structures and returns true if on-disk metadata should be updated.
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*/
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bool
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activemap_write_complete(struct activemap *amp, off_t offset, off_t length)
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{
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bool modified;
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off_t end;
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int ext;
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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PJDLOG_ASSERT(length > 0);
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modified = false;
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end = offset + length - 1;
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for (ext = off2ext(amp, offset); ext <= off2ext(amp, end); ext++) {
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/*
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* If the number of pending writes goes down to 0, we have to
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* mark the extent as clean also in on-disk bitmap.
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* By returning true we inform the caller that on-disk bitmap
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* was modified and has to be flushed to disk.
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*/
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PJDLOG_ASSERT(amp->am_memtab[ext] > 0);
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PJDLOG_ASSERT(bit_test(amp->am_memmap, ext));
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if (--amp->am_memtab[ext] == 0) {
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bit_clear(amp->am_memmap, ext);
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amp->am_ndirty--;
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if (keepdirty_find(amp, ext) == NULL)
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modified = true;
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}
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}
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return (modified);
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}
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/*
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* Function should be called after finishing synchronization of one extent.
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* It returns true if on-disk metadata should be updated.
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*/
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bool
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activemap_extent_complete(struct activemap *amp, int extent)
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{
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bool modified;
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int reqs;
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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PJDLOG_ASSERT(extent >= 0 && extent < amp->am_nextents);
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modified = false;
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reqs = ext2reqs(amp, extent);
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PJDLOG_ASSERT(amp->am_memtab[extent] >= reqs);
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amp->am_memtab[extent] -= reqs;
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PJDLOG_ASSERT(bit_test(amp->am_memmap, extent));
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if (amp->am_memtab[extent] == 0) {
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bit_clear(amp->am_memmap, extent);
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amp->am_ndirty--;
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modified = true;
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}
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return (modified);
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}
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/*
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* Function returns number of dirty regions.
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*/
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uint64_t
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activemap_ndirty(const struct activemap *amp)
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{
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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return (amp->am_ndirty);
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}
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/*
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* Function compare on-disk bitmap and in-memory bitmap and returns true if
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* they differ and should be flushed to the disk.
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*/
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bool
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activemap_differ(const struct activemap *amp)
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{
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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return (memcmp(amp->am_diskmap, amp->am_memmap,
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amp->am_mapsize) != 0);
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}
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/*
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* Function returns number of bytes used by bitmap.
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*/
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size_t
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activemap_size(const struct activemap *amp)
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{
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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return (amp->am_mapsize);
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}
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/*
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* Function returns number of bytes needed for storing on-disk bitmap.
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* This is the same as activemap_size(), but rounded up to sector size.
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*/
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size_t
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activemap_ondisk_size(const struct activemap *amp)
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{
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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return (amp->am_diskmapsize);
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}
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/*
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* Function copies the given buffer read from disk to the internal bitmap.
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*/
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void
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activemap_copyin(struct activemap *amp, const unsigned char *buf, size_t size)
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{
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int ext;
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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PJDLOG_ASSERT(size >= amp->am_mapsize);
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memcpy(amp->am_diskmap, buf, amp->am_mapsize);
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memcpy(amp->am_memmap, buf, amp->am_mapsize);
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memcpy(amp->am_syncmap, buf, amp->am_mapsize);
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bit_ffs(amp->am_memmap, amp->am_nextents, &ext);
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if (ext == -1) {
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/* There are no dirty extents, so we can leave now. */
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return;
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}
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/*
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* Set synchronization offset to the first dirty extent.
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*/
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activemap_sync_rewind(amp);
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/*
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* We have dirty extents and we want them to stay that way until
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* we synchronize, so we set number of pending writes to number
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* of requests needed to synchronize one extent.
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*/
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amp->am_ndirty = 0;
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for (; ext < amp->am_nextents; ext++) {
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if (bit_test(amp->am_memmap, ext)) {
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amp->am_memtab[ext] = ext2reqs(amp, ext);
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amp->am_ndirty++;
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}
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}
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}
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/*
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* Function merges the given bitmap with existing one.
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*/
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void
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activemap_merge(struct activemap *amp, const unsigned char *buf, size_t size)
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{
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bitstr_t *remmap = __DECONST(bitstr_t *, buf);
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int ext;
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PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
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PJDLOG_ASSERT(size >= amp->am_mapsize);
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bit_ffs(remmap, amp->am_nextents, &ext);
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if (ext == -1) {
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/* There are no dirty extents, so we can leave now. */
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return;
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}
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/*
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* We have dirty extents and we want them to stay that way until
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* we synchronize, so we set number of pending writes to number
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* of requests needed to synchronize one extent.
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*/
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for (; ext < amp->am_nextents; ext++) {
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/* Local extent already dirty. */
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if (bit_test(amp->am_syncmap, ext))
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continue;
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/* Remote extent isn't dirty. */
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if (!bit_test(remmap, ext))
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continue;
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bit_set(amp->am_syncmap, ext);
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bit_set(amp->am_memmap, ext);
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bit_set(amp->am_diskmap, ext);
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if (amp->am_memtab[ext] == 0)
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amp->am_ndirty++;
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amp->am_memtab[ext] = ext2reqs(amp, ext);
|
|
}
|
|
/*
|
|
* Set synchronization offset to the first dirty extent.
|
|
*/
|
|
activemap_sync_rewind(amp);
|
|
}
|
|
|
|
/*
|
|
* Function returns pointer to internal bitmap that should be written to disk.
|
|
*/
|
|
const unsigned char *
|
|
activemap_bitmap(struct activemap *amp, size_t *sizep)
|
|
{
|
|
|
|
PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
|
|
|
|
if (sizep != NULL)
|
|
*sizep = amp->am_diskmapsize;
|
|
memcpy(amp->am_diskmap, amp->am_memmap, amp->am_mapsize);
|
|
keepdirty_fill(amp);
|
|
return ((const unsigned char *)amp->am_diskmap);
|
|
}
|
|
|
|
/*
|
|
* Function calculates size needed to store bitmap on disk.
|
|
*/
|
|
size_t
|
|
activemap_calc_ondisk_size(uint64_t mediasize, uint32_t extentsize,
|
|
uint32_t sectorsize)
|
|
{
|
|
uint64_t nextents, mapsize;
|
|
|
|
PJDLOG_ASSERT(mediasize > 0);
|
|
PJDLOG_ASSERT(extentsize > 0);
|
|
PJDLOG_ASSERT(powerof2(extentsize));
|
|
PJDLOG_ASSERT(sectorsize > 0);
|
|
PJDLOG_ASSERT(powerof2(sectorsize));
|
|
|
|
nextents = ((mediasize - 1) / extentsize) + 1;
|
|
mapsize = bitstr_size(nextents);
|
|
return (roundup2(mapsize, sectorsize));
|
|
}
|
|
|
|
/*
|
|
* Set synchronization offset to the first dirty extent.
|
|
*/
|
|
void
|
|
activemap_sync_rewind(struct activemap *amp)
|
|
{
|
|
int ext;
|
|
|
|
PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
|
|
|
|
bit_ffs(amp->am_syncmap, amp->am_nextents, &ext);
|
|
if (ext == -1) {
|
|
/* There are no extents to synchronize. */
|
|
amp->am_syncoff = -2;
|
|
return;
|
|
}
|
|
/*
|
|
* Mark that we want to start synchronization from the beginning.
|
|
*/
|
|
amp->am_syncoff = -1;
|
|
}
|
|
|
|
/*
|
|
* Return next offset of where we should synchronize.
|
|
*/
|
|
off_t
|
|
activemap_sync_offset(struct activemap *amp, off_t *lengthp, int *syncextp)
|
|
{
|
|
off_t syncoff, left;
|
|
int ext;
|
|
|
|
PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
|
|
PJDLOG_ASSERT(lengthp != NULL);
|
|
PJDLOG_ASSERT(syncextp != NULL);
|
|
|
|
*syncextp = -1;
|
|
|
|
if (amp->am_syncoff == -2)
|
|
return (-1);
|
|
|
|
if (amp->am_syncoff >= 0 &&
|
|
(amp->am_syncoff + MAXPHYS >= amp->am_mediasize ||
|
|
off2ext(amp, amp->am_syncoff) !=
|
|
off2ext(amp, amp->am_syncoff + MAXPHYS))) {
|
|
/*
|
|
* We are about to change extent, so mark previous one as clean.
|
|
*/
|
|
ext = off2ext(amp, amp->am_syncoff);
|
|
bit_clear(amp->am_syncmap, ext);
|
|
*syncextp = ext;
|
|
amp->am_syncoff = -1;
|
|
}
|
|
|
|
if (amp->am_syncoff == -1) {
|
|
/*
|
|
* Let's find first extent to synchronize.
|
|
*/
|
|
bit_ffs(amp->am_syncmap, amp->am_nextents, &ext);
|
|
if (ext == -1) {
|
|
amp->am_syncoff = -2;
|
|
return (-1);
|
|
}
|
|
amp->am_syncoff = ext2off(amp, ext);
|
|
} else {
|
|
/*
|
|
* We don't change extent, so just increase offset.
|
|
*/
|
|
amp->am_syncoff += MAXPHYS;
|
|
if (amp->am_syncoff >= amp->am_mediasize) {
|
|
amp->am_syncoff = -2;
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
syncoff = amp->am_syncoff;
|
|
left = ext2off(amp, off2ext(amp, syncoff)) +
|
|
amp->am_extentsize - syncoff;
|
|
if (syncoff + left > amp->am_mediasize)
|
|
left = amp->am_mediasize - syncoff;
|
|
if (left > MAXPHYS)
|
|
left = MAXPHYS;
|
|
|
|
PJDLOG_ASSERT(left >= 0 && left <= MAXPHYS);
|
|
PJDLOG_ASSERT(syncoff >= 0 && syncoff < amp->am_mediasize);
|
|
PJDLOG_ASSERT(syncoff + left >= 0 &&
|
|
syncoff + left <= amp->am_mediasize);
|
|
|
|
*lengthp = left;
|
|
return (syncoff);
|
|
}
|
|
|
|
/*
|
|
* Mark extent(s) containing the given region for synchronization.
|
|
* Most likely one of the components is unavailable.
|
|
*/
|
|
bool
|
|
activemap_need_sync(struct activemap *amp, off_t offset, off_t length)
|
|
{
|
|
bool modified;
|
|
off_t end;
|
|
int ext;
|
|
|
|
PJDLOG_ASSERT(amp->am_magic == ACTIVEMAP_MAGIC);
|
|
|
|
modified = false;
|
|
end = offset + length - 1;
|
|
|
|
for (ext = off2ext(amp, offset); ext <= off2ext(amp, end); ext++) {
|
|
if (bit_test(amp->am_syncmap, ext)) {
|
|
/* Already marked for synchronization. */
|
|
PJDLOG_ASSERT(bit_test(amp->am_memmap, ext));
|
|
continue;
|
|
}
|
|
bit_set(amp->am_syncmap, ext);
|
|
if (!bit_test(amp->am_memmap, ext)) {
|
|
bit_set(amp->am_memmap, ext);
|
|
amp->am_ndirty++;
|
|
}
|
|
amp->am_memtab[ext] += ext2reqs(amp, ext);
|
|
modified = true;
|
|
}
|
|
|
|
return (modified);
|
|
}
|
|
|
|
void
|
|
activemap_dump(const struct activemap *amp)
|
|
{
|
|
int bit;
|
|
|
|
printf("M: ");
|
|
for (bit = 0; bit < amp->am_nextents; bit++)
|
|
printf("%d", bit_test(amp->am_memmap, bit) ? 1 : 0);
|
|
printf("\n");
|
|
printf("D: ");
|
|
for (bit = 0; bit < amp->am_nextents; bit++)
|
|
printf("%d", bit_test(amp->am_diskmap, bit) ? 1 : 0);
|
|
printf("\n");
|
|
printf("S: ");
|
|
for (bit = 0; bit < amp->am_nextents; bit++)
|
|
printf("%d", bit_test(amp->am_syncmap, bit) ? 1 : 0);
|
|
printf("\n");
|
|
}
|