From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 266A51487F6 for ; Tue, 18 Mar 2025 01:59:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.181 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742263144; cv=none; b=Ly33aAXzlP81bKaNfTHtbAbf5Wp5cTsZcCOaLM66nMMHSiEw2DJKX1txMcN/iNKWSmjvTdpNOavcEYID8Cf83kyOAZX5EhGb8e+yeauNE2QsysgzLBsDSlM6hduMwJ/IXYIGs/tRBGgCme7Dz9fZsrFkD4wiRsMoVNsYVjJGIRE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742263144; c=relaxed/simple; bh=L1Ne+QTLuSdegNnkSjDRJuIzUEEggu+Dwn3f9jsYy+M=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=W3jWRr3r2RCjz6nH2cWB/qk8LWWnubVTlJJxN6hwdAURb4dA3HLXZTBBXMEZSokyW1tf/D4AMJwgUCrHFQCW+Y4REsN07kAtK8Nf2hp72mRNGOV+WTI4sXKlgz0BnzYyPeoCa1VpsR28uO86BpG59KC3F8BS34sfGPKJoMWP45Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=furiosa.ai; spf=none smtp.mailfrom=furiosa.ai; dkim=pass (1024-bit key) header.d=furiosa.ai header.i=@furiosa.ai header.b=DDEOx4oT; arc=none smtp.client-ip=209.85.214.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=furiosa.ai Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=furiosa.ai Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=furiosa.ai header.i=@furiosa.ai header.b="DDEOx4oT" Received: by mail-pl1-f181.google.com with SMTP id d9443c01a7336-22622ddcc35so27187165ad.2 for ; Mon, 17 Mar 2025 18:59:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=furiosa.ai; s=google; t=1742263142; x=1742867942; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=yOwruOmPjgZz22CNw0HJ3t+DF5i9C0EpnBm3V/TK2zc=; b=DDEOx4oTrDtwtJdbXQOiMaw/Xiledcg/Op42tkWZvxSEDTTvnI7HKFRHD0vz9JmZe9 5rRDFh1n2N8RDaXMucjfPw6CEkGKVpxgNZuAQrMEW/ls85HUWi6B5/V6FRJYYNImxGIy G6zI2hErgZq3i1v6ygEA41/dZw5P8AcIfec9Y= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742263142; x=1742867942; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=yOwruOmPjgZz22CNw0HJ3t+DF5i9C0EpnBm3V/TK2zc=; b=kSg0gvgQw1xsv4Qb+/03Et4QHy562iG6WUrgvpJ4XnDxW4usw8JFQzlOh+Onh3XH9/ NNhoeNanI0Cv83XDhSb3h4lh/NxdRpEoPJUxnz6UKa7djfANXWzRN9zmmWCUNH7WSnk0 pPcTCuzAkcg7s+jsmdIC9PW4X5GKK/Gzw49uEhSFHCDkzJGFc5D4W3BnezMfb3oV3YIb crxv/9dq1RElnJFGgKlVnbVF/h2KSur2KdjIYeaxNuld8ePP0t0WvZp0+HZn6WDKbfmk AagDVy7JFoifHm62Ql7sMYYFlsQyXZ0A3aBdgP5ph9RWCEDdmB1pMaT3sn86fmC7yycJ rRAw== X-Forwarded-Encrypted: i=1; AJvYcCXDpYTECzY2ZvSW+SYcgIUjIsvAEmOh2tJQa9TDI6B5Tk7pgqNJrvJ6zRbd2MKd6UcS3wg922wSzTx7kTM=@vger.kernel.org X-Gm-Message-State: AOJu0YySYZyizMKjI7KaUefrFDNMM1+hhycEASx6DUlwp+p3Z7zApChN 9bBCR53/tIoz78R8lU8iqOOHLuag1hrBsvsjXe4E+7z3bkLY1P57eHj1xu5HnF4= X-Gm-Gg: ASbGnctXKVAsxJUzO+4FyYvYTiuIW68gp/drpXqxGaWnb+aqlc9Nazn7mPRc3PMwtFr buQs9PISiPPWPOpaBrkImskirVbmMP+sDW6JddbG8VJsZfnVMhahJ/RxD4JCppakzWEN5t32GBS vTTHTSObcbqgrXfh9DM1ar8jxpMaY0PV/Ych7EVA3SW4pFRHi5KIcYwfCfKbY/vLBFNeyL0Mo+Z zqTiYxpUcjzQqC9FZZNk9I44ORD0SZKsieO0Xrjv3s2PG7oN2og2esynxwJKgTksXbKeDxNxZd8 Ww4Qj13whDCSNsn9Y6s5cb9mpHDMZgpiex7qduC/b7i9/NrKCnBWHZEi/y1gE6yNZMsN4yawy7X lv1tWww== X-Google-Smtp-Source: AGHT+IHqhx0/CqW3BpT7+MPNBrTrcJBjwwRUne8O/7u2qtvmr8uSD5puhwybpej9PasKSNdyCQO0rg== X-Received: by 2002:a05:6a00:3d55:b0:736:ab48:18f0 with SMTP id d2e1a72fcca58-73757205e9cmr1957081b3a.1.1742263142384; Mon, 17 Mar 2025 18:59:02 -0700 (PDT) Received: from sidongui-MacBookPro.local ([221.148.76.1]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73711695b88sm8296766b3a.152.2025.03.17.18.59.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Mar 2025 18:59:01 -0700 (PDT) Date: Tue, 18 Mar 2025 10:58:57 +0900 From: Sidong Yang To: Jens Axboe Cc: Josef Bacik , David Sterba , Pavel Begunkov , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org Subject: Re: [RFC PATCH v4 4/5] btrfs: ioctl: introduce btrfs_uring_import_iovec() Message-ID: References: <20250317135742.4331-1-sidong.yang@furiosa.ai> <20250317135742.4331-5-sidong.yang@furiosa.ai> <3a883e1e-d822-4c89-a7b0-f8802b8cc261@kernel.dk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3a883e1e-d822-4c89-a7b0-f8802b8cc261@kernel.dk> On Mon, Mar 17, 2025 at 09:40:05AM -0600, Jens Axboe wrote: > On 3/17/25 7:57 AM, Sidong Yang wrote: > > This patch introduces btrfs_uring_import_iovec(). In encoded read/write > > with uring cmd, it uses import_iovec without supporting fixed buffer. > > btrfs_using_import_iovec() could use fixed buffer if cmd flags has > > IORING_URING_CMD_FIXED. > > > > Signed-off-by: Sidong Yang > > --- > > fs/btrfs/ioctl.c | 32 ++++++++++++++++++++++++-------- > > 1 file changed, 24 insertions(+), 8 deletions(-) > > > > diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c > > index 6c18bad53cd3..a7b52fd99059 100644 > > --- a/fs/btrfs/ioctl.c > > +++ b/fs/btrfs/ioctl.c > > @@ -4802,6 +4802,28 @@ struct btrfs_uring_encoded_data { > > struct iov_iter iter; > > }; > > > > +static int btrfs_uring_import_iovec(struct io_uring_cmd *cmd, > > + unsigned int issue_flags, int rw) > > +{ > > + struct btrfs_uring_encoded_data *data = > > + io_uring_cmd_get_async_data(cmd)->op_data; > > + int ret; > > + > > + if (cmd && (cmd->flags & IORING_URING_CMD_FIXED)) { > > + data->iov = NULL; > > + ret = io_uring_cmd_import_fixed_vec(cmd, data->args.iov, > > + data->args.iovcnt, > > + ITER_DEST, issue_flags, > > + &data->iter); > > + } else { > > + data->iov = data->iovstack; > > + ret = import_iovec(rw, data->args.iov, data->args.iovcnt, > > + ARRAY_SIZE(data->iovstack), &data->iov, > > + &data->iter); > > + } > > + return ret; > > +} > > How can 'cmd' be NULL here? It seems that there is no checkes for 'cmd' before and it works same as before. But I think it's better to add a check in function start for safety. > > > -- > Jens Axboe >