From patchwork Fri Feb 5 04:18:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Changlong Xie X-Patchwork-Id: 8231211 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 921AB9F1C1 for ; Fri, 5 Feb 2016 04:17:56 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4509320397 for ; Fri, 5 Feb 2016 04:17:55 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9761E2027D for ; Fri, 5 Feb 2016 04:17:53 +0000 (UTC) Received: from localhost ([::1]:45835 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRXqC-00051x-VC for patchwork-qemu-devel@patchwork.kernel.org; Thu, 04 Feb 2016 23:17:52 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40857) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRXpu-0004uL-J1 for qemu-devel@nongnu.org; Thu, 04 Feb 2016 23:17:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aRXpr-0006ZR-6s for qemu-devel@nongnu.org; Thu, 04 Feb 2016 23:17:34 -0500 Received: from [59.151.112.132] (port=16369 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRXpj-0006TR-1y; Thu, 04 Feb 2016 23:17:26 -0500 X-IronPort-AV: E=Sophos;i="5.20,346,1444665600"; d="scan'208";a="3343057" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 05 Feb 2016 12:17:03 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id 379DB41B7212; Fri, 5 Feb 2016 12:16:01 +0800 (CST) Received: from changlox.g08.fujitsu.local (10.167.225.55) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Fri, 5 Feb 2016 12:16:58 +0800 From: Changlong Xie To: qemu devel , Fam Zheng , Max Reitz , Paolo Bonzini , Kevin Wolf , Stefan Hajnoczi Date: Fri, 5 Feb 2016 12:18:07 +0800 Message-ID: <1454645888-28826-9-git-send-email-xiecl.fnst@cn.fujitsu.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1454645888-28826-1-git-send-email-xiecl.fnst@cn.fujitsu.com> References: <1454645888-28826-1-git-send-email-xiecl.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.225.55] X-yoursite-MailScanner-ID: 379DB41B7212.A263F X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: xiecl.fnst@cn.fujitsu.com X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Cc: qemu block , Jiang Yunhong , Dong Eddie , "Dr. David Alan Gilbert" , "Michael R. Hines" , Gonglei , zhanghailiang Subject: [Qemu-devel] [PATCH v15 8/9] Implement new driver for block replication X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Wen Congyang Signed-off-by: Wen Congyang Signed-off-by: zhanghailiang Signed-off-by: Gonglei Signed-off-by: Changlong Xie --- block/Makefile.objs | 1 + block/replication.c | 594 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 595 insertions(+) create mode 100644 block/replication.c diff --git a/block/Makefile.objs b/block/Makefile.objs index fa05f37..94c1d03 100644 --- a/block/Makefile.objs +++ b/block/Makefile.objs @@ -23,6 +23,7 @@ block-obj-$(CONFIG_LIBSSH2) += ssh.o block-obj-y += accounting.o block-obj-y += write-threshold.o block-obj-y += backup.o +block-obj-y += replication.o common-obj-y += stream.o common-obj-y += commit.o diff --git a/block/replication.c b/block/replication.c new file mode 100644 index 0000000..4631667 --- /dev/null +++ b/block/replication.c @@ -0,0 +1,594 @@ +/* + * Replication Block filter + * + * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. + * Copyright (c) 2016 Intel Corporation + * Copyright (c) 2016 FUJITSU LIMITED + * + * Author: + * Wen Congyang + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu-common.h" +#include "block/nbd.h" +#include "block/blockjob.h" +#include "block/block_int.h" +#include "replication.h" + +typedef struct BDRVReplicationState { + ReplicationMode mode; + int replication_state; + BdrvChild *active_disk; + BdrvChild *hidden_disk; + BdrvChild *secondary_disk; + BlockDriverState *top_bs; + ReplicationState *rs; + Error *blocker; + int orig_hidden_flags; + int orig_secondary_flags; + int error; +} BDRVReplicationState; + +enum { + BLOCK_REPLICATION_NONE, /* block replication is not started */ + BLOCK_REPLICATION_RUNNING, /* block replication is running */ + BLOCK_REPLICATION_FAILOVER, /* failover is running in background */ + BLOCK_REPLICATION_FAILOVER_FAILED, /* failover failed */ + BLOCK_REPLICATION_DONE, /* block replication is done(after failover) */ +}; + +static void replication_start(ReplicationState *rs, ReplicationMode mode, + Error **errp); +static void replication_do_checkpoint(ReplicationState *rs, Error **errp); +static void replication_get_error(ReplicationState *rs, Error **errp); +static void replication_stop(ReplicationState *rs, bool failover, + Error **errp); + +#define REPLICATION_MODE "mode" +static QemuOptsList replication_runtime_opts = { + .name = "replication", + .head = QTAILQ_HEAD_INITIALIZER(replication_runtime_opts.head), + .desc = { + { + .name = REPLICATION_MODE, + .type = QEMU_OPT_STRING, + }, + { /* end of list */ } + }, +}; + +static ReplicationOps replication_ops = { + .start = replication_start, + .checkpoint = replication_do_checkpoint, + .get_error = replication_get_error, + .stop = replication_stop, +}; + +static int replication_open(BlockDriverState *bs, QDict *options, + int flags, Error **errp) +{ + int ret; + BDRVReplicationState *s = bs->opaque; + Error *local_err = NULL; + QemuOpts *opts = NULL; + const char *mode; + + ret = -EINVAL; + opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort); + qemu_opts_absorb_qdict(opts, options, &local_err); + if (local_err) { + goto fail; + } + + mode = qemu_opt_get(opts, REPLICATION_MODE); + if (!mode) { + error_setg(&local_err, "Missing the option mode"); + goto fail; + } + + if (!strcmp(mode, "primary")) { + s->mode = REPLICATION_MODE_PRIMARY; + } else if (!strcmp(mode, "secondary")) { + s->mode = REPLICATION_MODE_SECONDARY; + } else { + error_setg(&local_err, + "The option mode's value should be primary or secondary"); + goto fail; + } + + s->rs = replication_new(bs, &replication_ops); + + ret = 0; + +fail: + qemu_opts_del(opts); + error_propagate(errp, local_err); + + return ret; +} + +static void replication_close(BlockDriverState *bs) +{ + BDRVReplicationState *s = bs->opaque; + + if (s->replication_state == BLOCK_REPLICATION_RUNNING) { + replication_stop(s->rs, false, NULL); + replication_remove(s->rs); + } +} + +static int64_t replication_getlength(BlockDriverState *bs) +{ + return bdrv_getlength(bs->file->bs); +} + +static int replication_get_io_status(BDRVReplicationState *s) +{ + switch (s->replication_state) { + case BLOCK_REPLICATION_NONE: + return -EIO; + case BLOCK_REPLICATION_RUNNING: + return 0; + case BLOCK_REPLICATION_FAILOVER: + return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; + case BLOCK_REPLICATION_FAILOVER_FAILED: + return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1; + case BLOCK_REPLICATION_DONE: + /* + * active commit job completes, and active disk and secondary_disk + * is swapped, so we can operate bs->file directly + */ + return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; + default: + abort(); + } +} + +static int replication_return_value(BDRVReplicationState *s, int ret) +{ + if (s->mode == REPLICATION_MODE_SECONDARY) { + return ret; + } + + if (ret < 0) { + s->error = ret; + ret = 0; + } + + return ret; +} + +static coroutine_fn int replication_co_readv(BlockDriverState *bs, + int64_t sector_num, + int remaining_sectors, + QEMUIOVector *qiov) +{ + BDRVReplicationState *s = bs->opaque; + int ret; + + if (s->mode == REPLICATION_MODE_PRIMARY) { + /* We only use it to forward primary write requests */ + return -EIO; + } + + ret = replication_get_io_status(s); + if (ret < 0) { + return ret; + } + + ret = bdrv_co_readv(bs->file->bs, sector_num, remaining_sectors, qiov); + return replication_return_value(s, ret); +} + +static coroutine_fn int replication_co_writev(BlockDriverState *bs, + int64_t sector_num, + int remaining_sectors, + QEMUIOVector *qiov) +{ + BDRVReplicationState *s = bs->opaque; + QEMUIOVector hd_qiov; + uint64_t bytes_done = 0; + BdrvChild *top = bs->file; + BdrvChild *base = s->secondary_disk; + BlockDriverState *target; + int ret, n; + + ret = replication_get_io_status(s); + if (ret < 0) { + return ret; + } + + if (ret == 0) { + ret = bdrv_co_writev(top->bs, sector_num, + remaining_sectors, qiov); + return replication_return_value(s, ret); + } + + /* + * Failover failed, only write to active disk if the sectors + * have already been allocated in active disk/hidden disk. + */ + qemu_iovec_init(&hd_qiov, qiov->niov); + while (remaining_sectors > 0) { + ret = bdrv_is_allocated_above(top->bs, base->bs, sector_num, + remaining_sectors, &n); + if (ret < 0) { + return ret; + } + + qemu_iovec_reset(&hd_qiov); + qemu_iovec_concat(&hd_qiov, qiov, bytes_done, n * BDRV_SECTOR_SIZE); + + target = ret ? (top->bs) : (base->bs); + ret = bdrv_co_writev(target, sector_num, n, &hd_qiov); + if (ret < 0) { + return ret; + } + + remaining_sectors -= n; + sector_num += n; + bytes_done += n * BDRV_SECTOR_SIZE; + } + + return 0; +} + +static bool replication_recurse_is_first_non_filter(BlockDriverState *bs, + BlockDriverState *candidate) +{ + return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate); +} + +static void secondary_do_checkpoint(BDRVReplicationState *s, Error **errp) +{ + Error *local_err = NULL; + int ret; + + if (!s->secondary_disk->bs->job) { + error_setg(errp, "Backup job was cancelled unexpectedly"); + return; + } + + backup_do_checkpoint(s->secondary_disk->bs->job, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + ret = s->active_disk->bs->drv->bdrv_make_empty(s->active_disk->bs); + if (ret < 0) { + error_setg(errp, "Cannot make active disk empty"); + return; + } + + ret = s->hidden_disk->bs->drv->bdrv_make_empty(s->hidden_disk->bs); + if (ret < 0) { + error_setg(errp, "Cannot make hidden disk empty"); + return; + } +} + +static void reopen_backing_file(BDRVReplicationState *s, bool writable, + Error **errp) +{ + BlockReopenQueue *reopen_queue = NULL; + int orig_hidden_flags, orig_secondary_flags; + int new_hidden_flags, new_secondary_flags; + Error *local_err = NULL; + + if (writable) { + orig_hidden_flags = s->orig_hidden_flags = + bdrv_get_flags(s->hidden_disk->bs); + new_hidden_flags = (orig_hidden_flags | BDRV_O_RDWR) & + ~BDRV_O_INACTIVE; + orig_secondary_flags = s->orig_secondary_flags = + bdrv_get_flags(s->secondary_disk->bs); + new_secondary_flags = (orig_secondary_flags | BDRV_O_RDWR) & + ~BDRV_O_INACTIVE; + } else { + orig_hidden_flags = (s->orig_hidden_flags | BDRV_O_RDWR) & + ~BDRV_O_INACTIVE; + new_hidden_flags = s->orig_hidden_flags; + orig_secondary_flags = (s->orig_secondary_flags | BDRV_O_RDWR) & + ~BDRV_O_INACTIVE; + new_secondary_flags = s->orig_secondary_flags; + } + + if (orig_hidden_flags != new_hidden_flags) { + reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs, NULL, + new_hidden_flags); + } + + if (!(orig_secondary_flags & BDRV_O_RDWR)) { + reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs, NULL, + new_secondary_flags); + } + + if (reopen_queue) { + bdrv_reopen_multiple(reopen_queue, &local_err); + error_propagate(errp, local_err); + } +} + +static void backup_job_cleanup(BDRVReplicationState *s) +{ + bdrv_op_unblock_all(s->top_bs, s->blocker); + error_free(s->blocker); + reopen_backing_file(s, false, NULL); +} + +static void backup_job_completed(void *opaque, int ret) +{ + BDRVReplicationState *s = opaque; + + if (s->replication_state != BLOCK_REPLICATION_FAILOVER) { + /* The backup job is cancelled unexpectedly */ + s->error = -EIO; + } + + backup_job_cleanup(s); +} + +static BlockDriverState *get_top_bs(BlockDriverState *bs) +{ + BdrvChild *child; + + while (!bs->blk) { + if (QLIST_EMPTY(&bs->parents)) { + return NULL; + } + + child = QLIST_FIRST(&bs->parents); + if (QLIST_NEXT(child, next_parent)) { + return NULL; + } + + bs = child->parent; + } + + return bs; +} + +static void replication_start(ReplicationState *rs, ReplicationMode mode, + Error **errp) +{ + BlockDriverState *bs = rs->opaque; + BDRVReplicationState *s = bs->opaque; + int64_t active_length, hidden_length, disk_length; + AioContext *aio_context; + Error *local_err = NULL; + + if (s->replication_state != BLOCK_REPLICATION_NONE) { + error_setg(errp, "Block replication is running or done"); + return; + } + + if (s->mode != mode) { + error_setg(errp, "The parameter mode's value is invalid, needs %d," + " but got %d", s->mode, mode); + return; + } + + aio_context = bdrv_get_aio_context(bs); + switch (s->mode) { + case REPLICATION_MODE_PRIMARY: + break; + case REPLICATION_MODE_SECONDARY: + s->active_disk = bs->file; + if (!s->active_disk || !s->active_disk->bs || + !s->active_disk->bs->backing) { + error_setg(errp, "Active disk doesn't have backing file"); + return; + } + + s->hidden_disk = s->active_disk->bs->backing; + if (!s->hidden_disk->bs || !s->hidden_disk->bs->backing) { + error_setg(errp, "Hidden disk doesn't have backing file"); + return; + } + + s->secondary_disk = s->hidden_disk->bs->backing; + if (!s->secondary_disk->bs || !s->secondary_disk->bs->blk) { + error_setg(errp, "The secondary disk doesn't have block backend"); + return; + } + + s->top_bs = get_top_bs(bs); + if (!s->top_bs) { + error_setg(errp, "Cannot get the top block driver state to do" + " internal backup"); + return; + } + + /* verify the length */ + active_length = bdrv_getlength(s->active_disk->bs); + hidden_length = bdrv_getlength(s->hidden_disk->bs); + disk_length = bdrv_getlength(s->secondary_disk->bs); + if (active_length < 0 || hidden_length < 0 || disk_length < 0 || + active_length != hidden_length || hidden_length != disk_length) { + error_setg(errp, "active disk, hidden disk, secondary disk's length" + " are not the same"); + return; + } + + if (!s->active_disk->bs->drv->bdrv_make_empty || + !s->hidden_disk->bs->drv->bdrv_make_empty) { + error_setg(errp, + "active disk or hidden disk doesn't support make_empty"); + return; + } + + /* reopen the backing file in r/w mode */ + reopen_backing_file(s, true, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + /* start backup job now */ + error_setg(&s->blocker, + "block device is in use by internal backup job"); + bdrv_op_block_all(s->top_bs, s->blocker); + bdrv_op_unblock(s->top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); + + /* + * Must protect backup target if backup job was stopped/cancelled + * unexpectedly + */ + bdrv_ref(s->hidden_disk->bs); + + aio_context_acquire(aio_context); + backup_start(s->secondary_disk->bs, s->hidden_disk->bs, 0, + MIRROR_SYNC_MODE_NONE, NULL, BLOCKDEV_ON_ERROR_REPORT, + BLOCKDEV_ON_ERROR_REPORT, backup_job_completed, + s, NULL, &local_err); + aio_context_release(aio_context); + if (local_err) { + error_propagate(errp, local_err); + backup_job_cleanup(s); + bdrv_unref(s->hidden_disk->bs); + return; + } + break; + default: + abort(); + } + + s->replication_state = BLOCK_REPLICATION_RUNNING; + + if (s->mode == REPLICATION_MODE_SECONDARY) { + aio_context_acquire(aio_context); + secondary_do_checkpoint(s, errp); + aio_context_release(aio_context); + } + + s->error = 0; +} + +static void replication_do_checkpoint(ReplicationState *rs, Error **errp) +{ + BlockDriverState *bs = rs->opaque; + BDRVReplicationState *s = bs->opaque; + AioContext *aio_context; + + if (s->mode == REPLICATION_MODE_SECONDARY) { + aio_context = bdrv_get_aio_context(bs); + aio_context_acquire(aio_context); + secondary_do_checkpoint(s, errp); + aio_context_release(aio_context); + } +} + +static void replication_get_error(ReplicationState *rs, Error **errp) +{ + BlockDriverState *bs = rs->opaque; + BDRVReplicationState *s = bs->opaque; + + if (s->replication_state != BLOCK_REPLICATION_RUNNING) { + error_setg(errp, "Block replication is not running"); + return; + } + + if (s->error) { + error_setg(errp, "I/O error occurred"); + return; + } +} + +static void replication_done(void *opaque, int ret) +{ + BlockDriverState *bs = opaque; + BDRVReplicationState *s = bs->opaque; + + if (ret == 0) { + s->replication_state = BLOCK_REPLICATION_DONE; + + /* refresh top bs's filename */ + bdrv_refresh_filename(bs); + s->active_disk = NULL; + s->secondary_disk = NULL; + s->hidden_disk = NULL; + s->error = 0; + } else { + s->replication_state = BLOCK_REPLICATION_FAILOVER_FAILED; + s->error = -EIO; + } +} + +static void replication_stop(ReplicationState *rs, bool failover, Error **errp) +{ + BlockDriverState *bs = rs->opaque; + BDRVReplicationState *s = bs->opaque; + AioContext *aio_context; + + if (s->replication_state != BLOCK_REPLICATION_RUNNING) { + error_setg(errp, "Block replication is not running"); + return; + } + + switch (s->mode) { + case REPLICATION_MODE_PRIMARY: + s->replication_state = BLOCK_REPLICATION_DONE; + s->error = 0; + break; + case REPLICATION_MODE_SECONDARY: + aio_context = bdrv_get_aio_context(bs); + if (!failover) { + /* + * This BDS will be closed, and the job should be completed + * before the BDS is closed, because we will access hidden + * disk, secondary disk in backup_job_completed(). + */ + if (s->secondary_disk->bs->job) { + block_job_cancel_sync(s->secondary_disk->bs->job); + } + aio_context_acquire(aio_context); + secondary_do_checkpoint(s, errp); + aio_context_release(aio_context); + s->replication_state = BLOCK_REPLICATION_DONE; + return; + } + + s->replication_state = BLOCK_REPLICATION_FAILOVER; + if (s->secondary_disk->bs->job) { + block_job_cancel(s->secondary_disk->bs->job); + } + + aio_context_acquire(aio_context); + commit_active_start(s->active_disk->bs, s->secondary_disk->bs, 0, + BLOCKDEV_ON_ERROR_REPORT, replication_done, + bs, errp, true); + aio_context_release(aio_context); + break; + default: + abort(); + } +} + +BlockDriver bdrv_replication = { + .format_name = "replication", + .protocol_name = "replication", + .instance_size = sizeof(BDRVReplicationState), + + .bdrv_open = replication_open, + .bdrv_close = replication_close, + + .bdrv_getlength = replication_getlength, + .bdrv_co_readv = replication_co_readv, + .bdrv_co_writev = replication_co_writev, + + .is_filter = true, + .bdrv_recurse_is_first_non_filter = replication_recurse_is_first_non_filter, + + .has_variable_length = true, +}; + +static void bdrv_replication_init(void) +{ + bdrv_register(&bdrv_replication); +} + +block_init(bdrv_replication_init);