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bh=c1fuJa5ieggS4PhAR64buGO6f6hS+qiZSVSigdWVwXs=; b=YyDFGE8S1UT6BlC8bFX56XybNCokNZu4jJE3MWF7culVRHBuEhTgsrxDwqx3/HbcUQsL+8 ErbEs6zo2XUCHg0lSJsk/u+EorMMzugdxHCbmlystXmUM/wSIZZzL8SJG1EwYmGIpizhsU bkjJFQG7jaSwPL+qCGt+s/QyTDYtk1w= X-MC-Unique: 4fvjKXScNESPioRLWtuYRQ-1 From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH v3 4/6] nbd: Simplify qemu bitmap context name Date: Thu, 8 Oct 2020 21:07:12 -0500 Message-Id: <20201009020714.1074061-5-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" Each dirty bitmap already knows its name; by reducing the scope of the places where we construct "qemu:dirty-bitmap:NAME" strings, tracking the name is more localized, and there are fewer per-export fields to worry about. This in turn will make it easier for an upcoming patch to export more than one bitmap at once. Signed-off-by: Eric Blake --- nbd/server.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/nbd/server.c b/nbd/server.c index ea5de0b503cd..6326d6fe3f3a 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -97,7 +97,6 @@ struct NBDExport { bool alloc_context; BdrvDirtyBitmap *export_bitmap; - char *export_bitmap_context; }; static QTAILQ_HEAD(, NBDExport) exports =3D QTAILQ_HEAD_INITIALIZER(export= s); @@ -882,14 +881,15 @@ 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"= ); return true; } - if (nbd_meta_empty_or_pattern(client, - meta->exp->export_bitmap_context + - strlen("qemu:dirty-bitmap:"), query)= ) { + 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; } return true; @@ -1025,8 +1025,11 @@ static int nbd_negotiate_meta_queries(NBDClient *cli= ent, } if (meta->bitmap) { - ret =3D nbd_negotiate_send_meta_context(client, - meta->exp->export_bitmap_con= text, + 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); + + ret =3D nbd_negotiate_send_meta_context(client, context, NBD_META_ID_DIRTY_BITMAP, errp); if (ret < 0) { @@ -1599,9 +1602,6 @@ static int nbd_export_create(BlockExport *blk_exp, Bl= ockExportOptions *exp_args, bdrv_dirty_bitmap_set_busy(bm, true); exp->export_bitmap =3D bm; assert(strlen(bitmap) <=3D BDRV_BITMAP_MAX_NAME_SIZE); - exp->export_bitmap_context =3D g_strdup_printf("qemu:dirty-bitmap:= %s", - bitmap); - assert(strlen(exp->export_bitmap_context) < NBD_MAX_STRING_SIZE); } exp->alloc_context =3D arg->alloc; @@ -1681,7 +1681,6 @@ static void nbd_export_delete(BlockExport *blk_exp) if (exp->export_bitmap) { bdrv_dirty_bitmap_set_busy(exp->export_bitmap, false); - g_free(exp->export_bitmap_context); } } --=20 2.28.0