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bh=vDhsjOxJJ17oolgE04i0yPAKFi3Ss1MM7vHXvbd8znQ=; b=HuOD1zot9hEqHZkWZSV46SbyZdn9F8sRqQgHkGgglAp6yrQ/VTSNIZTJlwcMEpoyP3fHpK avj5y1oHlJZayWc+yxvs0ZNM8apcURYLm2YqAUnS9rppUK/ywsI0UT5hSFnxortjkM3dtX TsUh+/CfrvqmzNetebfIG6pi/3Iu5Eo= X-MC-Unique: PZ9DiLDtM_eirZzuZZmPcw-1 From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH v4 4/7] nbd: Update qapi to support exporting multiple bitmaps Date: Fri, 9 Oct 2020 16:55:30 -0500 Message-Id: <20201009215533.1194742-5-eblake@redhat.com> In-Reply-To: <20201009215533.1194742-1-eblake@redhat.com> References: <20201009215533.1194742-1-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 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" Since 'nbd-server-add' is deprecated, and 'block-export-add' is new to 5.2, we can still tweak the interface. Allowing 'bitmaps':['str'] is nicer than 'bitmap':'str'. This wires up the qapi and qemu-nbd changes to permit passing multiple bitmaps as distinct metadata contexts that the NBD client may request, but the actual support for more than one will require a further patch to the server. Signed-off-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy --- qapi/block-export.json | 18 ++++++++++++------ blockdev-nbd.c | 14 ++++++++++++++ nbd/server.c | 19 +++++++++++++------ qemu-nbd.c | 13 ++++++++----- 4 files changed, 47 insertions(+), 17 deletions(-) diff --git a/qapi/block-export.json b/qapi/block-export.json index 893d5cde5dfe..c7c749d61097 100644 --- a/qapi/block-export.json +++ b/qapi/block-export.json @@ -74,10 +74,10 @@ # @description: Free-form description of the export, up to 4096 bytes. # (Since 5.0) # -# @bitmap: Also export the dirty bitmap reachable from @device, so the -# NBD client can use NBD_OPT_SET_META_CONTEXT with the -# metadata context name "qemu:dirty-bitmap:NAME" to inspect the -# bitmap. (since 4.0) +# @bitmaps: Also export each of the named dirty bitmaps reachable from +# @device, so the NBD client can use NBD_OPT_SET_META_CONTEXT wi= th +# the metadata context name "qemu:dirty-bitmap:BITMAP" to inspect +# each bitmap. (since 5.2) # # @allocation-depth: Also export the allocation depth map for @device, so # the NBD client can use NBD_OPT_SET_META_CONTEXT with @@ -88,7 +88,7 @@ ## { 'struct': 'BlockExportOptionsNbd', 'data': { '*name': 'str', '*description': 'str', - '*bitmap': 'str', '*allocation-depth': 'bool' } } + '*bitmaps': ['str'], '*allocation-depth': 'bool' } } ## # @NbdServerAddOptions: @@ -100,12 +100,18 @@ # @writable: Whether clients should be able to write to the device via the # NBD connection (default false). # +# @bitmap: Also export a single dirty bitmap reachable from @device, so the +# NBD client can use NBD_OPT_SET_META_CONTEXT with the metadata +# context name "qemu:dirty-bitmap:BITMAP" to inspect the bitmap +# (since 4.0). Mutually exclusive with @bitmaps, and newer +# clients should use that instead. +# # Since: 5.0 ## { 'struct': 'NbdServerAddOptions', 'base': 'BlockExportOptionsNbd', 'data': { 'device': 'str', - '*writable': 'bool' } } + '*writable': 'bool', '*bitmap': 'str' } } ## # @nbd-server-add: diff --git a/blockdev-nbd.c b/blockdev-nbd.c index 43856c1058a5..359a198de2c7 100644 --- a/blockdev-nbd.c +++ b/blockdev-nbd.c @@ -192,6 +192,20 @@ void qmp_nbd_server_add(NbdServerAddOptions *arg, Erro= r **errp) return; } + /* + * New code should use the list 'bitmaps'; but until this code is + * gone, we must support the older single 'bitmap'. Use only one. + */ + if (arg->has_bitmap) { + if (arg->has_bitmaps) { + error_setg(errp, "Can't mix 'bitmap' and 'bitmaps'"); + return; + } + arg->has_bitmaps =3D true; + arg->bitmaps =3D g_new0(strList, 1); + arg->bitmaps->value =3D g_strdup(arg->bitmap); + } + /* * block-export-add would default to the node-name, but we may have to= use * the device name as a default here for compatibility. diff --git a/nbd/server.c b/nbd/server.c index 30cfe0eee467..884ffa00f1bd 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1495,6 +1495,7 @@ static int nbd_export_create(BlockExport *blk_exp, Bl= ockExportOptions *exp_args, uint64_t perm, shared_perm; bool readonly =3D !exp_args->writable; bool shared =3D !exp_args->writable; + strList *bitmaps; int ret; assert(exp_args->type =3D=3D BLOCK_EXPORT_TYPE_NBD); @@ -1556,12 +1557,18 @@ static int nbd_export_create(BlockExport *blk_exp, = BlockExportOptions *exp_args, } exp->size =3D QEMU_ALIGN_DOWN(size, BDRV_SECTOR_SIZE); - if (arg->bitmap) { + /* 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) { + const char *bitmap =3D bitmaps->value; BlockDriverState *bs =3D blk_bs(blk); BdrvDirtyBitmap *bm =3D NULL; while (bs) { - bm =3D bdrv_find_dirty_bitmap(bs, arg->bitmap); + bm =3D bdrv_find_dirty_bitmap(bs, bitmap); if (bm !=3D NULL) { break; } @@ -1571,7 +1578,7 @@ static int nbd_export_create(BlockExport *blk_exp, Bl= ockExportOptions *exp_args, if (bm =3D=3D NULL) { ret =3D -ENOENT; - error_setg(errp, "Bitmap '%s' is not found", arg->bitmap); + error_setg(errp, "Bitmap '%s' is not found", bitmap); goto fail; } @@ -1585,15 +1592,15 @@ static int nbd_export_create(BlockExport *blk_exp, = BlockExportOptions *exp_args, ret =3D -EINVAL; error_setg(errp, "Enabled bitmap '%s' incompatible with readonly exp= ort", - arg->bitmap); + bitmap); goto fail; } bdrv_dirty_bitmap_set_busy(bm, true); exp->export_bitmap =3D bm; - assert(strlen(arg->bitmap) <=3D BDRV_BITMAP_MAX_NAME_SIZE); + assert(strlen(bitmap) <=3D BDRV_BITMAP_MAX_NAME_SIZE); exp->export_bitmap_context =3D g_strdup_printf("qemu:dirty-bitmap:= %s", - arg->bitmap); + bitmap); assert(strlen(exp->export_bitmap_context) < NBD_MAX_STRING_SIZE); } diff --git a/qemu-nbd.c b/qemu-nbd.c index 847fde435a7f..fa5c68749e8f 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -572,7 +572,7 @@ int main(int argc, char **argv) const char *export_name =3D NULL; /* defaults to "" later for server m= ode */ const char *export_description =3D NULL; bool alloc_depth =3D false; - const char *bitmap =3D NULL; + strList *bitmaps =3D NULL, *tmp; const char *tlscredsid =3D NULL; bool imageOpts =3D false; bool writethrough =3D true; @@ -701,7 +701,10 @@ int main(int argc, char **argv) alloc_depth =3D true; break; case 'B': - bitmap =3D optarg; + tmp =3D g_new(strList, 1); + tmp->value =3D g_strdup(optarg); + tmp->next =3D bitmaps; + bitmaps =3D tmp; break; case 'k': sockpath =3D optarg; @@ -798,7 +801,7 @@ int main(int argc, char **argv) } if (export_name || export_description || dev_offset || device || disconnect || fmt || sn_id_or_name || alloc_depth || - bitmap || seen_aio || seen_discard || seen_cache) { + bitmaps || seen_aio || seen_discard || seen_cache) { error_report("List mode is incompatible with per-device settin= gs"); exit(EXIT_FAILURE); } @@ -1082,8 +1085,8 @@ int main(int argc, char **argv) .name =3D g_strdup(export_name), .has_description =3D !!export_description, .description =3D g_strdup(export_description), - .has_bitmap =3D !!bitmap, - .bitmap =3D g_strdup(bitmap), + .has_bitmaps =3D !!bitmaps, + .bitmaps =3D bitmaps, .has_allocation_depth =3D alloc_depth, .allocation_depth =3D alloc_depth, }, --=20 2.28.0