855761d5db
requests in parallel.
+ Add kern.geom.mirror.sync_requests tunable which defines how many parallel
I/O requests should be used.
+ Retire kern.geom.mirror.reqs_per_sync and kern.geom.mirror.syncs_per_sec
sysctls.
- Fix race between regular and synchronization requests.
- Reimplement mirror's data synchronization - do not use the topology lock
for this purpose, as it may case deadlocks.
- Stop synchronization from pre-sync hook.
- Fix some other minor issues.
MFC after: 3 days
483 lines
15 KiB
C
483 lines
15 KiB
C
/*-
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* Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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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 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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* $FreeBSD$
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*/
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#ifndef _G_MIRROR_H_
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#define _G_MIRROR_H_
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#include <sys/endian.h>
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#include <sys/md5.h>
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#define G_MIRROR_CLASS_NAME "MIRROR"
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#define G_MIRROR_MAGIC "GEOM::MIRROR"
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/*
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* Version history:
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* 0 - Initial version number.
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* 1 - Added 'prefer' balance algorithm.
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* 2 - Added md_genid field to metadata.
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* 3 - Added md_provsize field to metadata.
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*/
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#define G_MIRROR_VERSION 3
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#define G_MIRROR_BALANCE_NONE 0
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#define G_MIRROR_BALANCE_ROUND_ROBIN 1
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#define G_MIRROR_BALANCE_LOAD 2
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#define G_MIRROR_BALANCE_SPLIT 3
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#define G_MIRROR_BALANCE_PREFER 4
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#define G_MIRROR_BALANCE_MIN G_MIRROR_BALANCE_NONE
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#define G_MIRROR_BALANCE_MAX G_MIRROR_BALANCE_PREFER
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#define G_MIRROR_DISK_FLAG_DIRTY 0x0000000000000001ULL
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#define G_MIRROR_DISK_FLAG_SYNCHRONIZING 0x0000000000000002ULL
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#define G_MIRROR_DISK_FLAG_FORCE_SYNC 0x0000000000000004ULL
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#define G_MIRROR_DISK_FLAG_INACTIVE 0x0000000000000008ULL
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#define G_MIRROR_DISK_FLAG_HARDCODED 0x0000000000000010ULL
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#define G_MIRROR_DISK_FLAG_BROKEN 0x0000000000000020ULL
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#define G_MIRROR_DISK_FLAG_MASK (G_MIRROR_DISK_FLAG_DIRTY | \
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G_MIRROR_DISK_FLAG_SYNCHRONIZING | \
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G_MIRROR_DISK_FLAG_FORCE_SYNC | \
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G_MIRROR_DISK_FLAG_INACTIVE)
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#define G_MIRROR_DEVICE_FLAG_NOAUTOSYNC 0x0000000000000001ULL
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#define G_MIRROR_DEVICE_FLAG_MASK (G_MIRROR_DEVICE_FLAG_NOAUTOSYNC)
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#ifdef _KERNEL
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extern u_int g_mirror_debug;
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#define G_MIRROR_DEBUG(lvl, ...) do { \
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if (g_mirror_debug >= (lvl)) { \
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printf("GEOM_MIRROR"); \
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if (g_mirror_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf("\n"); \
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} \
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} while (0)
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#define G_MIRROR_LOGREQ(lvl, bp, ...) do { \
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if (g_mirror_debug >= (lvl)) { \
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printf("GEOM_MIRROR"); \
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if (g_mirror_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf(" "); \
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g_print_bio(bp); \
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printf("\n"); \
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} \
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} while (0)
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#define G_MIRROR_BIO_FLAG_REGULAR 0x01
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#define G_MIRROR_BIO_FLAG_SYNC 0x02
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/*
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* Informations needed for synchronization.
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*/
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struct g_mirror_disk_sync {
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struct g_consumer *ds_consumer; /* Consumer connected to our mirror. */
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off_t ds_offset; /* Offset of next request to send. */
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off_t ds_offset_done; /* Offset of already synchronized
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region. */
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u_int ds_syncid; /* Disk's synchronization ID. */
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u_int ds_inflight; /* Number of in-flight sync requests. */
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struct bio **ds_bios; /* BIOs for synchronization I/O. */
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};
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/*
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* Informations needed for synchronization.
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*/
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struct g_mirror_device_sync {
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struct g_geom *ds_geom; /* Synchronization geom. */
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u_int ds_ndisks; /* Number of disks in SYNCHRONIZING
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state. */
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};
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#define G_MIRROR_DISK_STATE_NONE 0
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#define G_MIRROR_DISK_STATE_NEW 1
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#define G_MIRROR_DISK_STATE_ACTIVE 2
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#define G_MIRROR_DISK_STATE_STALE 3
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#define G_MIRROR_DISK_STATE_SYNCHRONIZING 4
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#define G_MIRROR_DISK_STATE_DISCONNECTED 5
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#define G_MIRROR_DISK_STATE_DESTROY 6
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struct g_mirror_disk {
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uint32_t d_id; /* Disk ID. */
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struct g_consumer *d_consumer; /* Consumer. */
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struct g_mirror_softc *d_softc; /* Back-pointer to softc. */
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int d_state; /* Disk state. */
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u_int d_priority; /* Disk priority. */
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struct bintime d_delay; /* Disk delay. */
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struct bintime d_last_used; /* When disk was last used. */
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uint64_t d_flags; /* Additional flags. */
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u_int d_genid; /* Disk's generation ID. */
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struct g_mirror_disk_sync d_sync;/* Sync information. */
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LIST_ENTRY(g_mirror_disk) d_next;
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};
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#define d_name d_consumer->provider->name
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#define G_MIRROR_EVENT_DONTWAIT 0x1
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#define G_MIRROR_EVENT_WAIT 0x2
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#define G_MIRROR_EVENT_DEVICE 0x4
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#define G_MIRROR_EVENT_DONE 0x8
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struct g_mirror_event {
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struct g_mirror_disk *e_disk;
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int e_state;
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int e_flags;
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int e_error;
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TAILQ_ENTRY(g_mirror_event) e_next;
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};
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#define G_MIRROR_DEVICE_FLAG_DESTROY 0x0100000000000000ULL
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#define G_MIRROR_DEVICE_FLAG_WAIT 0x0200000000000000ULL
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#define G_MIRROR_DEVICE_STATE_STARTING 0
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#define G_MIRROR_DEVICE_STATE_RUNNING 1
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/* Bump syncid on first write. */
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#define G_MIRROR_BUMP_SYNCID 0x1
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/* Bump genid immediately. */
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#define G_MIRROR_BUMP_GENID 0x2
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struct g_mirror_softc {
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u_int sc_state; /* Device state. */
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uint32_t sc_slice; /* Slice size. */
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uint8_t sc_balance; /* Balance algorithm. */
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uint64_t sc_mediasize; /* Device size. */
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uint32_t sc_sectorsize; /* Sector size. */
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uint64_t sc_flags; /* Additional flags. */
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struct g_geom *sc_geom;
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struct g_provider *sc_provider;
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uint32_t sc_id; /* Mirror unique ID. */
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struct sx sc_lock;
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struct bio_queue_head sc_queue;
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struct mtx sc_queue_mtx;
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struct proc *sc_worker;
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struct bio_queue_head sc_regular_delayed; /* Delayed I/O requests due
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collision with sync
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requests. */
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struct bio_queue_head sc_inflight; /* In-flight regular write
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requests. */
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struct bio_queue_head sc_sync_delayed; /* Delayed sync requests due
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collision with regular
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requests. */
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LIST_HEAD(, g_mirror_disk) sc_disks;
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u_int sc_ndisks; /* Number of disks. */
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struct g_mirror_disk *sc_hint;
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u_int sc_genid; /* Generation ID. */
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u_int sc_syncid; /* Synchronization ID. */
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int sc_bump_id;
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struct g_mirror_device_sync sc_sync;
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int sc_idle; /* DIRTY flags removed. */
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time_t sc_last_write;
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u_int sc_writes;
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TAILQ_HEAD(, g_mirror_event) sc_events;
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struct mtx sc_events_mtx;
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struct callout sc_callout;
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struct root_hold_token *sc_rootmount;
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};
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#define sc_name sc_geom->name
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u_int g_mirror_ndisks(struct g_mirror_softc *sc, int state);
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int g_mirror_destroy(struct g_mirror_softc *sc, boolean_t force);
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int g_mirror_event_send(void *arg, int state, int flags);
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struct g_mirror_metadata;
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int g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp,
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struct g_mirror_metadata *md);
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int g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md);
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void g_mirror_fill_metadata(struct g_mirror_softc *sc,
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struct g_mirror_disk *disk, struct g_mirror_metadata *md);
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void g_mirror_update_metadata(struct g_mirror_disk *disk);
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g_ctl_req_t g_mirror_config;
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#endif /* _KERNEL */
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struct g_mirror_metadata {
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char md_magic[16]; /* Magic value. */
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uint32_t md_version; /* Version number. */
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char md_name[16]; /* Mirror name. */
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uint32_t md_mid; /* Mirror unique ID. */
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uint32_t md_did; /* Disk unique ID. */
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uint8_t md_all; /* Number of disks in mirror. */
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uint32_t md_genid; /* Generation ID. */
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uint32_t md_syncid; /* Synchronization ID. */
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uint8_t md_priority; /* Disk priority. */
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uint32_t md_slice; /* Slice size. */
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uint8_t md_balance; /* Balance type. */
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uint64_t md_mediasize; /* Size of the smallest
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disk in mirror. */
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uint32_t md_sectorsize; /* Sector size. */
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uint64_t md_sync_offset; /* Synchronized offset. */
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uint64_t md_mflags; /* Additional mirror flags. */
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uint64_t md_dflags; /* Additional disk flags. */
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char md_provider[16]; /* Hardcoded provider. */
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uint64_t md_provsize; /* Provider's size. */
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u_char md_hash[16]; /* MD5 hash. */
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};
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static __inline void
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mirror_metadata_encode(struct g_mirror_metadata *md, u_char *data)
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{
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MD5_CTX ctx;
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bcopy(md->md_magic, data, 16);
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le32enc(data + 16, md->md_version);
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bcopy(md->md_name, data + 20, 16);
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le32enc(data + 36, md->md_mid);
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le32enc(data + 40, md->md_did);
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*(data + 44) = md->md_all;
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le32enc(data + 45, md->md_genid);
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le32enc(data + 49, md->md_syncid);
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*(data + 53) = md->md_priority;
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le32enc(data + 54, md->md_slice);
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*(data + 58) = md->md_balance;
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le64enc(data + 59, md->md_mediasize);
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le32enc(data + 67, md->md_sectorsize);
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le64enc(data + 71, md->md_sync_offset);
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le64enc(data + 79, md->md_mflags);
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le64enc(data + 87, md->md_dflags);
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bcopy(md->md_provider, data + 95, 16);
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le64enc(data + 111, md->md_provsize);
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MD5Init(&ctx);
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MD5Update(&ctx, data, 119);
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MD5Final(md->md_hash, &ctx);
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bcopy(md->md_hash, data + 119, 16);
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}
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static __inline int
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mirror_metadata_decode_v0v1(const u_char *data, struct g_mirror_metadata *md)
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{
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MD5_CTX ctx;
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bcopy(data + 20, md->md_name, 16);
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md->md_mid = le32dec(data + 36);
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md->md_did = le32dec(data + 40);
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md->md_all = *(data + 44);
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md->md_syncid = le32dec(data + 45);
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md->md_priority = *(data + 49);
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md->md_slice = le32dec(data + 50);
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md->md_balance = *(data + 54);
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md->md_mediasize = le64dec(data + 55);
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md->md_sectorsize = le32dec(data + 63);
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md->md_sync_offset = le64dec(data + 67);
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md->md_mflags = le64dec(data + 75);
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md->md_dflags = le64dec(data + 83);
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bcopy(data + 91, md->md_provider, 16);
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bcopy(data + 107, md->md_hash, 16);
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MD5Init(&ctx);
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MD5Update(&ctx, data, 107);
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MD5Final(md->md_hash, &ctx);
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if (bcmp(md->md_hash, data + 107, 16) != 0)
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return (EINVAL);
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/* New fields. */
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md->md_genid = 0;
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md->md_provsize = 0;
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return (0);
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}
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static __inline int
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mirror_metadata_decode_v2(const u_char *data, struct g_mirror_metadata *md)
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{
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MD5_CTX ctx;
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bcopy(data + 20, md->md_name, 16);
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md->md_mid = le32dec(data + 36);
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md->md_did = le32dec(data + 40);
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md->md_all = *(data + 44);
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md->md_genid = le32dec(data + 45);
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md->md_syncid = le32dec(data + 49);
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md->md_priority = *(data + 53);
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md->md_slice = le32dec(data + 54);
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md->md_balance = *(data + 58);
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md->md_mediasize = le64dec(data + 59);
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md->md_sectorsize = le32dec(data + 67);
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md->md_sync_offset = le64dec(data + 71);
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md->md_mflags = le64dec(data + 79);
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md->md_dflags = le64dec(data + 87);
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bcopy(data + 95, md->md_provider, 16);
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bcopy(data + 111, md->md_hash, 16);
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MD5Init(&ctx);
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MD5Update(&ctx, data, 111);
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MD5Final(md->md_hash, &ctx);
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if (bcmp(md->md_hash, data + 111, 16) != 0)
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return (EINVAL);
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/* New fields. */
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md->md_provsize = 0;
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return (0);
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}
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static __inline int
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mirror_metadata_decode_v3(const u_char *data, struct g_mirror_metadata *md)
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{
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MD5_CTX ctx;
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bcopy(data + 20, md->md_name, 16);
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md->md_mid = le32dec(data + 36);
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md->md_did = le32dec(data + 40);
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md->md_all = *(data + 44);
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md->md_genid = le32dec(data + 45);
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md->md_syncid = le32dec(data + 49);
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md->md_priority = *(data + 53);
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md->md_slice = le32dec(data + 54);
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md->md_balance = *(data + 58);
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md->md_mediasize = le64dec(data + 59);
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md->md_sectorsize = le32dec(data + 67);
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md->md_sync_offset = le64dec(data + 71);
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md->md_mflags = le64dec(data + 79);
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md->md_dflags = le64dec(data + 87);
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bcopy(data + 95, md->md_provider, 16);
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md->md_provsize = le64dec(data + 111);
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bcopy(data + 119, md->md_hash, 16);
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MD5Init(&ctx);
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MD5Update(&ctx, data, 119);
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MD5Final(md->md_hash, &ctx);
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if (bcmp(md->md_hash, data + 119, 16) != 0)
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return (EINVAL);
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return (0);
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}
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static __inline int
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mirror_metadata_decode(const u_char *data, struct g_mirror_metadata *md)
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{
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int error;
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bcopy(data, md->md_magic, 16);
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md->md_version = le32dec(data + 16);
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switch (md->md_version) {
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case 0:
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case 1:
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error = mirror_metadata_decode_v0v1(data, md);
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break;
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case 2:
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error = mirror_metadata_decode_v2(data, md);
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break;
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case 3:
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error = mirror_metadata_decode_v3(data, md);
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break;
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default:
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error = EINVAL;
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break;
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}
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return (error);
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}
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static __inline const char *
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balance_name(u_int balance)
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{
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static const char *algorithms[] = {
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[G_MIRROR_BALANCE_NONE] = "none",
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[G_MIRROR_BALANCE_ROUND_ROBIN] = "round-robin",
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[G_MIRROR_BALANCE_LOAD] = "load",
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[G_MIRROR_BALANCE_SPLIT] = "split",
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[G_MIRROR_BALANCE_PREFER] = "prefer",
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[G_MIRROR_BALANCE_MAX + 1] = "unknown"
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};
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if (balance > G_MIRROR_BALANCE_MAX)
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balance = G_MIRROR_BALANCE_MAX + 1;
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return (algorithms[balance]);
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}
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static __inline int
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balance_id(const char *name)
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{
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static const char *algorithms[] = {
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[G_MIRROR_BALANCE_NONE] = "none",
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[G_MIRROR_BALANCE_ROUND_ROBIN] = "round-robin",
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[G_MIRROR_BALANCE_LOAD] = "load",
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[G_MIRROR_BALANCE_SPLIT] = "split",
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[G_MIRROR_BALANCE_PREFER] = "prefer"
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};
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int n;
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for (n = G_MIRROR_BALANCE_MIN; n <= G_MIRROR_BALANCE_MAX; n++) {
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if (strcmp(name, algorithms[n]) == 0)
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return (n);
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}
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return (-1);
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}
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static __inline void
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mirror_metadata_dump(const struct g_mirror_metadata *md)
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{
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static const char hex[] = "0123456789abcdef";
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char hash[16 * 2 + 1];
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u_int i;
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printf(" magic: %s\n", md->md_magic);
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printf(" version: %u\n", (u_int)md->md_version);
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printf(" name: %s\n", md->md_name);
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printf(" mid: %u\n", (u_int)md->md_mid);
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printf(" did: %u\n", (u_int)md->md_did);
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printf(" all: %u\n", (u_int)md->md_all);
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printf(" genid: %u\n", (u_int)md->md_genid);
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printf(" syncid: %u\n", (u_int)md->md_syncid);
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printf(" priority: %u\n", (u_int)md->md_priority);
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printf(" slice: %u\n", (u_int)md->md_slice);
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printf(" balance: %s\n", balance_name((u_int)md->md_balance));
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printf(" mediasize: %jd\n", (intmax_t)md->md_mediasize);
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printf("sectorsize: %u\n", (u_int)md->md_sectorsize);
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printf("syncoffset: %jd\n", (intmax_t)md->md_sync_offset);
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printf(" mflags:");
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if (md->md_mflags == 0)
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printf(" NONE");
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else {
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if ((md->md_mflags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0)
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printf(" NOAUTOSYNC");
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}
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printf("\n");
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printf(" dflags:");
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if (md->md_dflags == 0)
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printf(" NONE");
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else {
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if ((md->md_dflags & G_MIRROR_DISK_FLAG_DIRTY) != 0)
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printf(" DIRTY");
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if ((md->md_dflags & G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0)
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printf(" SYNCHRONIZING");
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if ((md->md_dflags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0)
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printf(" FORCE_SYNC");
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if ((md->md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0)
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printf(" INACTIVE");
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}
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printf("\n");
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printf("hcprovider: %s\n", md->md_provider);
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printf(" provsize: %ju\n", (uintmax_t)md->md_provsize);
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bzero(hash, sizeof(hash));
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for (i = 0; i < 16; i++) {
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hash[i * 2] = hex[md->md_hash[i] >> 4];
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hash[i * 2 + 1] = hex[md->md_hash[i] & 0x0f];
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}
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printf(" MD5 hash: %s\n", hash);
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}
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#endif /* !_G_MIRROR_H_ */
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