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bh=jnj9zIISjvynJAb3iL34smTPNKHTz5UdnoDisyXaetk=; b=LEzdxmN/2c9Ys+gXQF5381sjWcIghqYcNB4yVUFVRVilNDxZfxHXuooEJ+DweQfoTiq/5L rew+uSQvCIlH7ePEqo6TFTRnKlBD3U786fzxmZsk7dGrG8MCJvqLDRxXhk6bSMQaSm5wei SePPNoEwZiYt95l7oSDNWWhgFp1u0K8= X-MC-Unique: gdennriqMnOyb5osbg190Q-1 From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH v3 6/6] nbd: Allow export of multiple bitmaps for one device Date: Thu, 8 Oct 2020 21:07:14 -0500 Message-Id: <20201009020714.1074061-7-eblake@redhat.com> In-Reply-To: <20201009020714.1074061-1-eblake@redhat.com> References: <20201009020714.1074061-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eblake@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" With this, 'qemu-nbd -B b0 -B b1 -f qcow2 img.qcow2' can let you sniff out multiple bitmaps from one server. qemu-img as client can still only read one bitmap per client connection, but other NBD clients (hello libnbd) can now read multiple bitmaps in a single pass. Signed-off-by: Eric Blake --- nbd/server.c | 89 +++++++++++++++++++++++++++++------------- tests/qemu-iotests/291 | 6 +-- 2 files changed, 63 insertions(+), 32 deletions(-) diff --git a/nbd/server.c b/nbd/server.c index 3664f9e744b4..0017e18254a3 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -96,7 +96,8 @@ struct NBDExport { Notifier eject_notifier; bool alloc_context; - BdrvDirtyBitmap *export_bitmap; + BdrvDirtyBitmap **export_bitmaps; + size_t nr_export_bitmaps; }; static QTAILQ_HEAD(, NBDExport) exports =3D QTAILQ_HEAD_INITIALIZER(export= s); @@ -109,7 +110,10 @@ typedef struct NBDExportMetaContexts { size_t count; /* number of negotiated contexts */ bool base_allocation; /* export base:allocation context (block status)= */ bool allocation_depth; /* export qemu:allocation-depth */ - bool bitmap; /* export qemu:dirty-bitmap: */ + bool *bitmaps; /* + * export qemu:dirty-bitmap:, + * sized by exp->nr_export_bitmaps + */ } NBDExportMetaContexts; struct NBDClient { @@ -861,6 +865,8 @@ static bool nbd_meta_base_query(NBDClient *client, NBDE= xportMetaContexts *meta, static bool nbd_meta_qemu_query(NBDClient *client, NBDExportMetaContexts *= meta, const char *query) { + size_t i; + if (!nbd_strshift(&query, "qemu:")) { return false; } @@ -869,7 +875,7 @@ static bool nbd_meta_qemu_query(NBDClient *client, NBDE= xportMetaContexts *meta, if (!*query) { if (client->opt =3D=3D NBD_OPT_LIST_META_CONTEXT) { meta->allocation_depth =3D meta->exp->alloc_context; - meta->bitmap =3D !!meta->exp->export_bitmap; + memset(meta->bitmaps, 1, meta->exp->nr_export_bitmaps); } trace_nbd_negotiate_meta_query_parse("empty"); return true; @@ -882,17 +888,26 @@ static bool nbd_meta_qemu_query(NBDClient *client, NB= DExportMetaContexts *meta, } if (nbd_strshift(&query, "dirty-bitmap:")) { - const char *bm_name; - trace_nbd_negotiate_meta_query_parse("dirty-bitmap:"); - if (!meta->exp->export_bitmap) { - trace_nbd_negotiate_meta_query_skip("no dirty-bitmap exported"= ); + if (!*query) { + if (client->opt =3D=3D NBD_OPT_LIST_META_CONTEXT) { + memset(meta->bitmaps, 1, meta->exp->nr_export_bitmaps); + } + trace_nbd_negotiate_meta_query_parse("empty"); return true; } - bm_name =3D bdrv_dirty_bitmap_name(meta->exp->export_bitmap); - if (nbd_meta_empty_or_pattern(client, bm_name, query)) { - meta->bitmap =3D true; + + for (i =3D 0; i < meta->exp->nr_export_bitmaps; i++) { + const char *bm_name; + + bm_name =3D bdrv_dirty_bitmap_name(meta->exp->export_bitmaps[i= ]); + if (strcmp(bm_name, query) =3D=3D 0) { + meta->bitmaps[i] =3D true; + trace_nbd_negotiate_meta_query_parse(query); + return true; + } } + trace_nbd_negotiate_meta_query_skip("no dirty-bitmap match"); return true; } @@ -954,9 +969,10 @@ static int nbd_negotiate_meta_queries(NBDClient *clien= t, { int ret; g_autofree char *export_name =3D NULL; - NBDExportMetaContexts local_meta; + g_autofree bool *bitmaps =3D NULL; + NBDExportMetaContexts local_meta =3D {0}; uint32_t nb_queries; - int i; + size_t i; size_t count =3D 0; if (!client->structured_reply) { @@ -971,6 +987,7 @@ static int nbd_negotiate_meta_queries(NBDClient *client, meta =3D &local_meta; } + g_free(meta->bitmaps); memset(meta, 0, sizeof(*meta)); ret =3D nbd_opt_read_name(client, &export_name, NULL, errp); @@ -985,6 +1002,10 @@ static int nbd_negotiate_meta_queries(NBDClient *clie= nt, return nbd_opt_drop(client, NBD_REP_ERR_UNKNOWN, errp, "export '%s' not present", sane_name); } + meta->bitmaps =3D g_new0(bool, meta->exp->nr_export_bitmaps); + if (client->opt =3D=3D NBD_OPT_LIST_META_CONTEXT) { + bitmaps =3D meta->bitmaps; + } ret =3D nbd_opt_read(client, &nb_queries, sizeof(nb_queries), false, e= rrp); if (ret <=3D 0) { @@ -998,7 +1019,7 @@ static int nbd_negotiate_meta_queries(NBDClient *clien= t, /* enable all known contexts */ meta->base_allocation =3D true; meta->allocation_depth =3D meta->exp->alloc_context; - meta->bitmap =3D !!meta->exp->export_bitmap; + memset(meta->bitmaps, 1, meta->exp->nr_export_bitmaps); } else { for (i =3D 0; i < nb_queries; ++i) { ret =3D nbd_negotiate_meta_query(client, meta, errp); @@ -1028,13 +1049,19 @@ static int nbd_negotiate_meta_queries(NBDClient *cl= ient, count++; } - if (meta->bitmap) { - const char *bm_name =3D bdrv_dirty_bitmap_name(meta->exp->export_b= itmap); - g_autofree char *context =3D g_strdup_printf("qemu:dirty-bitmap:%s= ", - bm_name); + for (i =3D 0; i < meta->exp->nr_export_bitmaps; i++) { + const char *bm_name; + g_autofree char *context =3D NULL; + + if (!meta->bitmaps[i]) { + continue; + } + + bm_name =3D bdrv_dirty_bitmap_name(meta->exp->export_bitmaps[i]); + context =3D g_strdup_printf("qemu:dirty-bitmap:%s", bm_name); ret =3D nbd_negotiate_send_meta_context(client, context, - NBD_META_ID_DIRTY_BITMAP, + NBD_META_ID_DIRTY_BITMAP + i, errp); if (ret < 0) { return ret; @@ -1388,6 +1415,7 @@ void nbd_client_put(NBDClient *client) QTAILQ_REMOVE(&client->exp->clients, client, next); blk_exp_unref(&client->exp->common); } + g_free(client->export_meta.bitmaps); g_free(client); } } @@ -1565,11 +1593,11 @@ static int nbd_export_create(BlockExport *blk_exp, = BlockExportOptions *exp_args, } exp->size =3D QEMU_ALIGN_DOWN(size, BDRV_SECTOR_SIZE); - /* XXX Allow more than one bitmap */ - if (arg->bitmaps && arg->bitmaps->next) { - error_setg(errp, "multiple bitmaps per export not supported yet"); - return -EOPNOTSUPP; + for (bitmaps =3D arg->bitmaps; bitmaps; bitmaps =3D bitmaps->next) { + exp->nr_export_bitmaps++; } + exp->export_bitmaps =3D g_new0(BdrvDirtyBitmap *, exp->nr_export_bitma= ps); + exp->nr_export_bitmaps =3D 0; for (bitmaps =3D arg->bitmaps; bitmaps; bitmaps =3D bitmaps->next) { const char *bitmap =3D bitmaps->value; BlockDriverState *bs =3D blk_bs(blk); @@ -1605,7 +1633,7 @@ static int nbd_export_create(BlockExport *blk_exp, Bl= ockExportOptions *exp_args, } bdrv_dirty_bitmap_set_busy(bm, true); - exp->export_bitmap =3D bm; + exp->export_bitmaps[exp->nr_export_bitmaps++] =3D bm; assert(strlen(bitmap) <=3D BDRV_BITMAP_MAX_NAME_SIZE); } @@ -1667,6 +1695,7 @@ static void nbd_export_request_shutdown(BlockExport *= blk_exp) static void nbd_export_delete(BlockExport *blk_exp) { + size_t i; NBDExport *exp =3D container_of(blk_exp, NBDExport, common); assert(exp->name =3D=3D NULL); @@ -1684,8 +1713,8 @@ static void nbd_export_delete(BlockExport *blk_exp) blk_aio_detach, exp); } - if (exp->export_bitmap) { - bdrv_dirty_bitmap_set_busy(exp->export_bitmap, false); + for (i =3D 0; i < exp->nr_export_bitmaps; i++) { + bdrv_dirty_bitmap_set_busy(exp->export_bitmaps[i], false); } } @@ -2332,6 +2361,7 @@ static coroutine_fn int nbd_handle_request(NBDClient = *client, int flags; NBDExport *exp =3D client->exp; char *msg; + size_t i; switch (request->type) { case NBD_CMD_CACHE: @@ -2435,12 +2465,15 @@ static coroutine_fn int nbd_handle_request(NBDClien= t *client, } } - if (client->export_meta.bitmap) { + for (i =3D 0; i < client->exp->nr_export_bitmaps; i++) { + if (!client->export_meta.bitmaps[i]) { + continue; + } ret =3D nbd_co_send_bitmap(client, request->handle, - client->exp->export_bitmap, + client->exp->export_bitmaps[i], request->from, request->len, dont_fragment, !--contexts_remain= ing, - NBD_META_ID_DIRTY_BITMAP, errp); + NBD_META_ID_DIRTY_BITMAP + i, err= p); if (ret < 0) { return ret; } diff --git a/tests/qemu-iotests/291 b/tests/qemu-iotests/291 index 4f837b205655..37848ac60bba 100755 --- a/tests/qemu-iotests/291 +++ b/tests/qemu-iotests/291 @@ -107,16 +107,14 @@ echo # x-dirty-bitmap is a hack for reading bitmaps; it abuses block status to # report "data":false for portions of the bitmap which are set IMG=3D"driver=3Dnbd,server.type=3Dunix,server.path=3D$nbd_unix_socket" -nbd_server_start_unix_socket -r -f qcow2 -B b0 "$TEST_IMG" +nbd_server_start_unix_socket -r -f qcow2 \ + -B b0 -B b1 -B b2 -B b3 "$TEST_IMG" $QEMU_IMG map --output=3Djson --image-opts \ "$IMG,x-dirty-bitmap=3Dqemu:dirty-bitmap:b0" | _filter_qemu_img_map -nbd_server_start_unix_socket -r -f qcow2 -B b1 "$TEST_IMG" $QEMU_IMG map --output=3Djson --image-opts \ "$IMG,x-dirty-bitmap=3Dqemu:dirty-bitmap:b1" | _filter_qemu_img_map -nbd_server_start_unix_socket -r -f qcow2 -B b2 "$TEST_IMG" $QEMU_IMG map --output=3Djson --image-opts \ "$IMG,x-dirty-bitmap=3Dqemu:dirty-bitmap:b2" | _filter_qemu_img_map -nbd_server_start_unix_socket -r -f qcow2 -B b3 "$TEST_IMG" $QEMU_IMG map --output=3Djson --image-opts \ "$IMG,x-dirty-bitmap=3Dqemu:dirty-bitmap:b3" | _filter_qemu_img_map --=20 2.28.0