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Wed, 2 Sep 2020 18:18:35 +0000 (UTC) Received: from blue.redhat.com (ovpn-113-128.phx2.redhat.com [10.3.113.128]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7020010013BD; Wed, 2 Sep 2020 18:18:34 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH v4 1/5] block: add bitmap-populate job Date: Wed, 2 Sep 2020 13:18:27 -0500 Message-Id: <20200902181831.2570048-2-eblake@redhat.com> In-Reply-To: <20200902181831.2570048-1-eblake@redhat.com> References: <20200902181831.2570048-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eblake@redhat.com X-Mimecast-Spam-Score: 0.003 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/02 01:13:52 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, pkrempa@redhat.com, qemu-block@nongnu.org, armbru@redhat.com, mreitz@redhat.com, vsementsov@virtuozzo.com, John Snow Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: John Snow This job copies the allocation map into a bitmap. It's a job because there's no guarantee that allocation interrogation will be quick (or won't hang), so it cannot be retrofitted into block-dirty-bitmap-merge. It was designed with different possible population patterns in mind, but only top layer allocation was implemented for now. Signed-off-by: John Snow Signed-off-by: Eric Blake --- qapi/block-core.json | 48 +++++++++ qapi/job.json | 6 +- include/block/block.h | 1 + include/block/block_int.h | 21 ++++ block/bitmap-populate.c | 207 ++++++++++++++++++++++++++++++++++++++ blockjob.c | 3 +- MAINTAINERS | 1 + block/meson.build | 1 + 8 files changed, 286 insertions(+), 2 deletions(-) create mode 100644 block/bitmap-populate.c diff --git a/qapi/block-core.json b/qapi/block-core.json index db08c58d788c..1cac9a9a8207 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -2216,6 +2216,54 @@ { 'command': 'block-dirty-bitmap-merge', 'data': 'BlockDirtyBitmapMerge' } +## +# @BitmapPattern: +# +# An enumeration of possible patterns that can be written into a bitmap. +# +# @allocation-top: The allocation status of the top layer +# of the attached storage node. +# +# Since: 5.2 +## +{ 'enum': 'BitmapPattern', + 'data': ['allocation-top'] } + +## +# @BlockDirtyBitmapPopulate: +# +# @job-id: identifier for the newly-created block job. +# +# @pattern: What pattern should be written into the bitmap? +# +# @on-error: the action to take if an error is encountered on a bitmap's +# attached node, default 'report'. +# 'stop' and 'enospc' can only be used if the block device supports +# io-status (see BlockInfo). +# +# @auto-finalize: When false, this job will wait in a PENDING state after it +# has finished its work, waiting for @block-job-finalize +# before making any block graph changes. +# When true, this job will automatically +# perform its abort or commit actions. +# Defaults to true. +# +# @auto-dismiss: When false, this job will wait in a CONCLUDED state after it +# has completely ceased all work, and awaits @block-job-dismiss. +# When true, this job will automatically disappear from the +# query list without user intervention. +# Defaults to true. +# +# Since: 5.2 +## +{ 'struct': 'BlockDirtyBitmapPopulate', + 'base': 'BlockDirtyBitmap', + 'data': { 'job-id': 'str', + 'pattern': 'BitmapPattern', + '*on-error': 'BlockdevOnError', + '*auto-finalize': 'bool', + '*auto-dismiss': 'bool' } } + ## # @BlockDirtyBitmapSha256: # diff --git a/qapi/job.json b/qapi/job.json index 280c2f76f136..fb0b606e868d 100644 --- a/qapi/job.json +++ b/qapi/job.json @@ -22,10 +22,14 @@ # # @amend: image options amend job type, see "x-blockdev-amend" (since 5.1) # +# @bitmap-populate: drive bitmap population job type, see +# "block-dirty-bitmap-populate" (since 5.2) +# # Since: 1.7 ## { 'enum': 'JobType', - 'data': ['commit', 'stream', 'mirror', 'backup', 'create', 'amend'] } + 'data': ['commit', 'stream', 'mirror', 'backup', 'create', 'amend', + 'bitmap-populate'] } ## # @JobStatus: diff --git a/include/block/block.h b/include/block/block.h index 6e36154061c1..f4b740857725 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -200,6 +200,7 @@ typedef struct BDRVReopenState { typedef enum BlockOpType { BLOCK_OP_TYPE_BACKUP_SOURCE, BLOCK_OP_TYPE_BACKUP_TARGET, + BLOCK_OP_TYPE_BITMAP_POPULATE, BLOCK_OP_TYPE_CHANGE, BLOCK_OP_TYPE_COMMIT_SOURCE, BLOCK_OP_TYPE_COMMIT_TARGET, diff --git a/include/block/block_int.h b/include/block/block_int.h index 9da7a42927eb..c85a79666524 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -1257,6 +1257,27 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs, BlockCompletionFunc *cb, void *opaque, JobTxn *txn, Error **errp); +/* + * bitpop_job_create: Create a new bitmap population job. + * + * @job_id: The id of the newly-created job. + * @bs: Block device associated with the @target_bitmap. + * @target_bitmap: The bitmap to populate. + * @on_error: What to do if an error on @bs is encountered. + * @creation_flags: Flags that control the behavior of the Job lifetime. + * See @BlockJobCreateFlags + * @cb: Completion function for the job. + * @opaque: Opaque pointer value passed to @cb. + * @txn: Transaction that this job is part of (may be NULL). + */ +BlockJob *bitpop_job_create(const char *job_id, BlockDriverState *bs, + BdrvDirtyBitmap *target_bitmap, + BitmapPattern pattern, + BlockdevOnError on_error, + int creation_flags, + BlockCompletionFunc *cb, void *opaque, + JobTxn *txn, Error **errp); + BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, const char *child_name, const BdrvChildClass *child_class, diff --git a/block/bitmap-populate.c b/block/bitmap-populate.c new file mode 100644 index 000000000000..aaf525c0ae74 --- /dev/null +++ b/block/bitmap-populate.c @@ -0,0 +1,207 @@ +/* + * Async Dirty Bitmap Populator + * + * Copyright (C) 2020 Red Hat, Inc. + * + * Authors: + * John Snow + * + * 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/osdep.h" + +#include "trace.h" +#include "block/block.h" +#include "block/block_int.h" +#include "block/blockjob_int.h" +#include "block/block_backup.h" +#include "block/block-copy.h" +#include "qapi/error.h" +#include "qapi/qmp/qerror.h" +#include "qemu/ratelimit.h" +#include "qemu/cutils.h" +#include "sysemu/block-backend.h" +#include "qemu/bitmap.h" +#include "qemu/error-report.h" + +typedef struct BitpopBlockJob { + BlockJob common; + BlockDriverState *bs; + BdrvDirtyBitmap *target_bitmap; + BdrvDirtyBitmap *new_bitmap; + BlockdevOnError on_error; + uint64_t len; +} BitpopBlockJob; + +static const BlockJobDriver bitpop_job_driver; + +static void bitpop_commit(Job *job) +{ + BitpopBlockJob *s = container_of(job, BitpopBlockJob, common.job); + + bdrv_dirty_bitmap_merge_internal(s->target_bitmap, s->new_bitmap, + NULL, true); +} + +/* no abort needed; just clean without committing. */ + +static void bitpop_clean(Job *job) +{ + BitpopBlockJob *s = container_of(job, BitpopBlockJob, common.job); + + bdrv_release_dirty_bitmap(s->new_bitmap); + bdrv_dirty_bitmap_set_busy(s->target_bitmap, false); +} + +static BlockErrorAction bitpop_error_action(BitpopBlockJob *job, int error) +{ + return block_job_error_action(&job->common, job->on_error, true, error); +} + +static bool coroutine_fn yield_and_check(Job *job) +{ + if (job_is_cancelled(job)) { + return true; + } + + job_sleep_ns(job, 0); + + if (job_is_cancelled(job)) { + return true; + } + + return false; +} + +static int coroutine_fn bitpop_run(Job *job, Error **errp) +{ + BitpopBlockJob *s = container_of(job, BitpopBlockJob, common.job); + int ret = 0; + int64_t offset; + int64_t count; + int64_t bytes; + + for (offset = 0; offset < s->len; ) { + if (yield_and_check(job)) { + ret = -ECANCELED; + break; + } + + bytes = s->len - offset; + ret = bdrv_is_allocated(s->bs, offset, bytes, &count); + if (ret < 0) { + if (bitpop_error_action(s, -ret) == BLOCK_ERROR_ACTION_REPORT) { + break; + } + continue; + } + + if (!count) { + ret = 0; + break; + } + + if (ret) { + bdrv_set_dirty_bitmap(s->new_bitmap, offset, count); + ret = 0; + } + + job_progress_update(job, count); + offset += count; + } + + return ret; +} + +static const BlockJobDriver bitpop_job_driver = { + .job_driver = { + .instance_size = sizeof(BitpopBlockJob), + .job_type = JOB_TYPE_BITMAP_POPULATE, + .free = block_job_free, + .user_resume = block_job_user_resume, + .run = bitpop_run, + .commit = bitpop_commit, + .clean = bitpop_clean, + } +}; + + +BlockJob *bitpop_job_create( + const char *job_id, + BlockDriverState *bs, + BdrvDirtyBitmap *target_bitmap, + BitmapPattern pattern, + BlockdevOnError on_error, + int creation_flags, + BlockCompletionFunc *cb, + void *opaque, + JobTxn *txn, + Error **errp) +{ + int64_t len; + BitpopBlockJob *job = NULL; + int64_t cluster_size; + BdrvDirtyBitmap *new_bitmap = NULL; + + assert(bs); + assert(target_bitmap); + + if (!bdrv_is_inserted(bs)) { + error_setg(errp, "Device is not inserted: %s", + bdrv_get_device_name(bs)); + return NULL; + } + + if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BITMAP_POPULATE, errp)) { + return NULL; + } + + if (bdrv_dirty_bitmap_check(target_bitmap, BDRV_BITMAP_DEFAULT, errp)) { + return NULL; + } + + if (pattern != BITMAP_PATTERN_ALLOCATION_TOP) { + error_setg(errp, "Unrecognized bitmap pattern"); + return NULL; + } + + len = bdrv_getlength(bs); + if (len < 0) { + error_setg_errno(errp, -len, "unable to get length for '%s'", + bdrv_get_device_or_node_name(bs)); + return NULL; + } + + /* NB: new bitmap is anonymous and enabled */ + cluster_size = bdrv_dirty_bitmap_granularity(target_bitmap); + new_bitmap = bdrv_create_dirty_bitmap(bs, cluster_size, NULL, errp); + if (!new_bitmap) { + return NULL; + } + + /* Take ownership; we reserve the right to write into this on-commit. */ + bdrv_dirty_bitmap_set_busy(target_bitmap, true); + + job = block_job_create(job_id, &bitpop_job_driver, txn, bs, + BLK_PERM_CONSISTENT_READ, + BLK_PERM_ALL & ~BLK_PERM_RESIZE, + 0, creation_flags, + cb, opaque, errp); + if (!job) { + bdrv_dirty_bitmap_set_busy(target_bitmap, false); + bdrv_release_dirty_bitmap(new_bitmap); + return NULL; + } + + job->bs = bs; + job->on_error = on_error; + job->target_bitmap = target_bitmap; + job->new_bitmap = new_bitmap; + job->len = len; + job_progress_set_remaining(&job->common.job, job->len); + + return &job->common; +} diff --git a/blockjob.c b/blockjob.c index 470facfd47a0..e6ee8376645d 100644 --- a/blockjob.c +++ b/blockjob.c @@ -56,7 +56,8 @@ static bool is_block_job(Job *job) return job_type(job) == JOB_TYPE_BACKUP || job_type(job) == JOB_TYPE_COMMIT || job_type(job) == JOB_TYPE_MIRROR || - job_type(job) == JOB_TYPE_STREAM; + job_type(job) == JOB_TYPE_STREAM || + job_type(job) == JOB_TYPE_BITMAP_POPULATE; } BlockJob *block_job_next(BlockJob *bjob) diff --git a/MAINTAINERS b/MAINTAINERS index b5ba553ee01a..b13b00774130 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2156,6 +2156,7 @@ S: Supported F: include/qemu/hbitmap.h F: include/block/dirty-bitmap.h F: block/monitor/bitmap-qmp-cmds.c +F: block/bitmap-populate.c F: block/dirty-bitmap.c F: block/qcow2-bitmap.c F: migration/block-dirty-bitmap.c diff --git a/block/meson.build b/block/meson.build index a3e56b7cd11d..8be5fd3c34fa 100644 --- a/block/meson.build +++ b/block/meson.build @@ -5,6 +5,7 @@ block_ss.add(files( 'amend.c', 'backup.c', 'backup-top.c', + 'bitmap-populate.c', 'blkdebug.c', 'blklogwrites.c', 'blkreplay.c', From patchwork Wed Sep 2 18:18:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 274791 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DECA9C433E2 for ; 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Wed, 02 Sep 2020 14:18:37 -0400 X-MC-Unique: rIRbEoUrO9SS370tbfqKdw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E22BC1019628; Wed, 2 Sep 2020 18:18:36 +0000 (UTC) Received: from blue.redhat.com (ovpn-113-128.phx2.redhat.com [10.3.113.128]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3E0D31002D6C; Wed, 2 Sep 2020 18:18:36 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH v4 3/5] qmp: expose block-dirty-bitmap-populate Date: Wed, 2 Sep 2020 13:18:29 -0500 Message-Id: <20200902181831.2570048-4-eblake@redhat.com> In-Reply-To: <20200902181831.2570048-1-eblake@redhat.com> References: <20200902181831.2570048-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eblake@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.120; envelope-from=eblake@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/02 02:07:24 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, pkrempa@redhat.com, qemu-block@nongnu.org, armbru@redhat.com, mreitz@redhat.com, vsementsov@virtuozzo.com, John Snow Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: John Snow This is a new job-creating command. Signed-off-by: John Snow Signed-off-by: Eric Blake --- qapi/block-core.json | 18 +++++++++++ qapi/transaction.json | 2 ++ blockdev.c | 74 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 94 insertions(+) diff --git a/qapi/block-core.json b/qapi/block-core.json index 1cac9a9a8207..ed05c0bfa720 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -2264,6 +2264,24 @@ '*auto-finalize': 'bool', '*auto-dismiss': 'bool' } } +## +# @block-dirty-bitmap-populate: +# +# Creates a new job that writes a pattern into a dirty bitmap. +# +# Since: 5.2 +# +# Example: +# +# -> { "execute": "block-dirty-bitmap-populate", +# "arguments": { "node": "drive0", "target": "bitmap0", +# "job-id": "job0", "pattern": "allocate-top" } } +# <- { "return": {} } +# +## +{ 'command': 'block-dirty-bitmap-populate', 'boxed': true, + 'data': 'BlockDirtyBitmapPopulate' } + ## # @BlockDirtyBitmapSha256: # diff --git a/qapi/transaction.json b/qapi/transaction.json index 15ddebdbc360..8302b824e4d5 100644 --- a/qapi/transaction.json +++ b/qapi/transaction.json @@ -51,6 +51,7 @@ # - @block-dirty-bitmap-enable: since 4.0 # - @block-dirty-bitmap-disable: since 4.0 # - @block-dirty-bitmap-merge: since 4.0 +# - @block-dirty-bitmap-populate: since 5.2 # - @blockdev-backup: since 2.3 # - @blockdev-snapshot: since 2.5 # - @blockdev-snapshot-internal-sync: since 1.7 @@ -68,6 +69,7 @@ 'block-dirty-bitmap-enable': 'BlockDirtyBitmap', 'block-dirty-bitmap-disable': 'BlockDirtyBitmap', 'block-dirty-bitmap-merge': 'BlockDirtyBitmapMerge', + 'block-dirty-bitmap-populate': 'BlockDirtyBitmapPopulate', 'blockdev-backup': 'BlockdevBackup', 'blockdev-snapshot': 'BlockdevSnapshot', 'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternal', diff --git a/blockdev.c b/blockdev.c index f177048a4fe8..3657377d2aca 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2190,6 +2190,63 @@ static void block_dirty_bitmap_remove_commit(BlkActionState *common) bdrv_release_dirty_bitmap(state->bitmap); } +static void block_dirty_bitmap_populate_prepare(BlkActionState *common, + Error **errp) +{ + BlockJobActionState *state = DO_UPCAST(BlockJobActionState, common, common); + BlockDirtyBitmapPopulate *bitpop; + BlockDriverState *bs; + AioContext *aio_context; + BdrvDirtyBitmap *bmap = NULL; + int job_flags = JOB_DEFAULT; + + assert(common->action->type == + TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_POPULATE); + bitpop = common->action->u.block_dirty_bitmap_populate.data; + + bmap = block_dirty_bitmap_lookup(bitpop->node, bitpop->name, &bs, errp); + if (!bmap) { + return; + } + + aio_context = bdrv_get_aio_context(bs); + aio_context_acquire(aio_context); + state->bs = bs; + + /* Paired with .clean() */ + bdrv_drained_begin(state->bs); + + if (!bitpop->has_on_error) { + bitpop->on_error = BLOCKDEV_ON_ERROR_REPORT; + } + if (!bitpop->has_auto_finalize) { + bitpop->auto_finalize = true; + } + if (!bitpop->has_auto_dismiss) { + bitpop->auto_dismiss = true; + } + + if (!bitpop->auto_finalize) { + job_flags |= JOB_MANUAL_FINALIZE; + } + if (!bitpop->auto_dismiss) { + job_flags |= JOB_MANUAL_DISMISS; + } + + state->job = bitpop_job_create( + bitpop->job_id, + bs, + bmap, + bitpop->pattern, + bitpop->on_error, + job_flags, + NULL, NULL, + common->block_job_txn, + errp); + + aio_context_release(aio_context); +} + static void abort_prepare(BlkActionState *common, Error **errp) { error_setg(errp, "Transaction aborted using Abort action"); @@ -2273,6 +2330,13 @@ static const BlkActionOps actions[] = { .commit = block_dirty_bitmap_remove_commit, .abort = block_dirty_bitmap_remove_abort, }, + [TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_POPULATE] = { + .instance_size = sizeof(BlockJobActionState), + .prepare = block_dirty_bitmap_populate_prepare, + .commit = blockdev_backup_commit, + .abort = blockdev_backup_abort, + .clean = blockdev_backup_clean, + }, /* Where are transactions for MIRROR, COMMIT and STREAM? * Although these blockjobs use transaction callbacks like the backup job, * these jobs do not necessarily adhere to transaction semantics. @@ -2392,6 +2456,16 @@ void qmp_block_passwd(bool has_device, const char *device, "Setting block passwords directly is no longer supported"); } +void qmp_block_dirty_bitmap_populate(BlockDirtyBitmapPopulate *bitpop, + Error **errp) +{ + TransactionAction action = { + .type = TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_POPULATE, + .u.block_dirty_bitmap_populate.data = bitpop, + }; + blockdev_do_action(&action, errp); +} + BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, const char *name, Error **errp)