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[46.116.102.127]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a073e5da4dsm9499765f8f.99.2025.04.27.15.59.05 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 27 Apr 2025 15:59:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1745794747; x=1746399547; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=JgTtq3pHpaj7n78orlTAZ+jsq9yxJtDldmhOoqc2tZs=; b=Y0XXuznKivFso3NfLigZVY84W422JA9Eiu6WogfVu0FTN7XIam7HMwNgjtErjmggHS 4XuwZNVuAj+yPO8qrj/rXBDmOcfPgkvMP3uObDitskW4gDf4KSCaPwZqIn1dR2xJBXEJ +6b4T2gufrpR3i53fPWA3cDgh/OpTN4EW+PjBfmla/5H2eB+ZJl8/TnDNHg4QkmIlGqP rqtdeJEu7aBtJYEzh0XdxqkEMfCOOCqNfy1nMqPSVO3OfCDKM1P0p7PDn05dmzwwaRj3 ZEZ2prk2Z/4rIkNRsOXPgK8sRDa9lZeNba9i0c7Gwqdd4b/SJmhU+u4pOJEW6jfscPFm PdyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1745794747; x=1746399547; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=JgTtq3pHpaj7n78orlTAZ+jsq9yxJtDldmhOoqc2tZs=; b=VG9n+CjZcq7ObeOtRICwAbV2hlecrzFuWDzUkdV8Zgu8j1fWvWIBWjpUHyvZat1fOP oJ3eefkXq3/GWYtV4FU8ZT/x+w4WxPLxp6Qt72D7vHx4nMOHo6jp6eLrR+R0nsZ1yOmt zIx3tRt/liOMrnSKG4tZDW2VQqumnZzwuUsff5l5P4F851wWc0/s7tg5BcKXnCRMdrDk E+2joEJUjzX3IzRk/4UfjdabyCZHq28gnpJxydV1/Q5sPr7zs8ADAagV7LBxKT5rvX/b nVi7Ac9u3zA9thaetPHNCGcN7UlNfMxaB76rDrKFR5jQE/VURj4M8wQTtZmSMe3bMMqd MEyQ== X-Forwarded-Encrypted: i=1; AJvYcCWW2MMkbG1lYUfP35txWAWIv1ciGJrYBb5jbLPq+X1WOt8pVKH/OiaQmXyAbcwY+iLaQtw5us8Dtkck@nongnu.org X-Gm-Message-State: AOJu0YxvQkvPe7a2M6ZD0TUMP/2HZUZkgJ6p5xefnOxM4Hw/xXgDZD+W TWs5vp/AM1WuuGaSvg53zXfkMOu1Z4OfVkloCasg0c62p9XFcAyb3JNNjYrQ X-Gm-Gg: ASbGnctsnGU8s2OGTOEYIn/QqJ8vCivE9n41MCZqetJvAtfHpfbWltNYgFuLRtxRcMJ HnHXHJfquwlTQNqlAhLEZHieV7Z+qUvVmoqSFghrt2wMvDhoyTfsQCR5axg0jvMglWywUSAXDX0 b9TDunDIF2jLwDKIf6xceRQcdhzWqQUGwbsQtMEJY9WlyqatrhTPL29swptSUSONc2ZjYn35Gk9 pjFGx2kGcs2UWZ5l0a6sLNOH4KEkdRzlkB+SHF5SMYwN7AP5qteAeNDwbWDOjnKXi4W0RQe8FLp yClH7+6pZeetaJr5T0G26vPPDpbBUwN5I2rLNfBb8jtIOTeyJir1S01QIwd2GZ5/i4BGMpHT86y cw1Z/aioeL+kOfUnW5urfMMjjC+YN X-Google-Smtp-Source: AGHT+IEc+nCVkp5ZU+1JUcEW70h2wTqtK2DjgoElMWgFwGC0VJZqg6Ed8iwRbHNn3kUgxiJ94c8QAA== X-Received: by 2002:a5d:6483:0:b0:3a0:84a5:4067 with SMTP id ffacd0b85a97d-3a084a5428amr859977f8f.54.1745794746924; Sun, 27 Apr 2025 15:59:06 -0700 (PDT) From: Nir Soffer To: qemu-devel@nongnu.org Cc: Hanna Reitz , Eric Blake , Markus Armbruster , qemu-block@nongnu.org, Fam Zheng , Kevin Wolf , Nir Soffer Subject: [PATCH 1/2] block/null: Report DATA if not reading zeroes Date: Mon, 28 Apr 2025 01:58:59 +0300 Message-Id: <20250427225900.24316-2-nirsof@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250427225900.24316-1-nirsof@gmail.com> References: <20250427225900.24316-1-nirsof@gmail.com> MIME-Version: 1.0 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; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::42b; envelope-from=nirsof@gmail.com; helo=mail-wr1-x42b.google.com 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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1745794820108019100 Content-Type: text/plain; charset="utf-8" If read-zeroes is not set, we did not report BDRV_BLOCK_DATA or BDRV_BLOCK_ZERO. This is not consistent with other drivers and can confuse users or other programs: % qemu-img map --output json "json:{'driver': 'raw', 'file': {'driver':= 'null-co', 'size': '1g'}}" [{ "start": 0, "length": 1073741824, "depth": 0, "present": false, "zer= o": false, "data": false, "compressed": false}] % qemu-nbd "json:{'driver': 'raw', 'file': {'driver': 'null-co', 'size'= : '1g'}}" & % nbdinfo --map nbd://127.0.0.1 0 1073741824 1 hole With this change we report DATA in this case: % ./qemu-img map --output json "json:{'driver': 'raw', 'file': {'driver= ': 'null-co', 'size': '1g'}}" [{ "start": 0, "length": 1073741824, "depth": 0, "present": true, "zero= ": false, "data": true, "compressed": false, "offset": 0}] % ./qemu-nbd "json:{'driver': 'raw', 'file': {'driver': 'null-co', 'siz= e': '1g'}}" & % nbdinfo --map nbd://127.0.0.1 0 1073741824 0 data Signed-off-by: Nir Soffer Reviewed-by: Eric Blake --- block/null.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/block/null.c b/block/null.c index dc0b1fdbd9..7ba87bd9a9 100644 --- a/block/null.c +++ b/block/null.c @@ -239,9 +239,7 @@ static int coroutine_fn null_co_block_status(BlockDrive= rState *bs, *map =3D offset; *file =3D bs; =20 - if (s->read_zeroes) { - ret |=3D BDRV_BLOCK_ZERO; - } + ret |=3D s->read_zeroes ? BDRV_BLOCK_ZERO : BDRV_BLOCK_DATA; return ret; } =20 --=20 2.39.5 (Apple Git-154)