From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f175.google.com (mail-pf1-f175.google.com [209.85.210.175]) (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 31F932010EE for ; Tue, 23 Dec 2025 00:36:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.175 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766450205; cv=none; b=QFJWAJn+fG3UdRrpJeauhoZuiehYYGeXQLvUscoktoTsuaaeIjH383Ne706U94eQAmE+OI+86Lp6jWpGXT9h2XilyEiRBaiYyW33z4QZR1hcZi4Cpj8QCv8cw+0oijSku/aHCqQ2xSfKU6f9xwYbLEhR3YlqNAW9cOIj15PZyAs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766450205; c=relaxed/simple; bh=uy7rz7ANJzS8g9YfvJ6y+5dneuYaD0+ZB1BzdAjhmn0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=h4dk8jTjnkDVW4ZEAiKkz9xdRnzURKq45HV+VbuDps3fVQKcngwMrjnNZn49dYsfOrzw8Lnq16ME1RMXWA53QOsYAKtBoKK30ZCWLBgWgjbYs5TyD1VQmXB3A1V19KunVELj3ZpHo2SwKJUIYtT62C1OmfpuNeusFtw3eL1JaiM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=VSWFAJae; arc=none smtp.client-ip=209.85.210.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="VSWFAJae" Received: by mail-pf1-f175.google.com with SMTP id d2e1a72fcca58-7b8e49d8b35so5474104b3a.3 for ; Mon, 22 Dec 2025 16:36:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1766450202; x=1767055002; darn=vger.kernel.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=fgmTpRFxpbRQ6LsaGcERk0vIYiGREY+h+hCEQsZPeiA=; b=VSWFAJae1THOsatfqEwxhLem40t6RFjVU3uQ55VUE1WGOhDe6AYHkUt37NrWc+mGFh CFhUiK71ciyVeWCM9EAnptbSXqEm3eolv2GZcNqxWlBdhPlIuqXVbDXoSaZnQokDW12Y gppJO/AIMugpHIA20DSA9q43ccQeegOTAkU00dZ58DBLjK1yATHrOQp5VYjuYt9VeB6E v3YWzKhNgS0qhtLvCjiaAzak7MCDKaTJ83sDfYawFgLJdbAywmxvr8T7t2xCQW4PF21O GEjzfQVbefHLBLkS0fF4Q+6lml72pTKqaFA5EuCXF6q5iPcq/zYS58g++96vjTFyJO6I VAvQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1766450202; x=1767055002; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=fgmTpRFxpbRQ6LsaGcERk0vIYiGREY+h+hCEQsZPeiA=; b=ii1GKGq/EQK/u+XSDAHrRKOQ8Ftr3X/eS0Y3ulH02fTO4dntScx19ZO856ivu8px6o gSausJk1LWiytmMmhBdnuH0ZfMc6Y99XPHAFMPCXuz2aumHBylfGVZ/ddGhTJB+yzUrD 5T959e/J4mf7n2R92t4A5GTW22gzb8JB7wYX7qN1j9lpLsex1Jdq6SD1iOHSo/U5klOX XIGcnXxj6OFswWRkfiDcC+gcQe97IJ3Guq144tJKUWa5vNTSQWTSrdB8ipPJuUCcigox C5+LCc4GIweOrEhpvf1zhZ9JyFa7Y0pC/v2iJRHiksKokMfCMkmHrjfp5aLI1sbh8cet vCxA== X-Forwarded-Encrypted: i=1; AJvYcCUoL6vRcEM1ZuCd6wxjynaAi+Ci8JzLNDaQKF+IEvP+3vWXyp8e0m1stt1sJ3MyAEfk4slLHivlwA==@vger.kernel.org X-Gm-Message-State: AOJu0YzKKgLBrZJHVOdLP8Z89x6ATx2CmhY5DmIF9NqO8AWYr71daZzt 15C+wf726mxFw3vnhYPZBkGimRx2iZ4QY9hsa103F+yDS6ehb8XGMGBO X-Gm-Gg: AY/fxX5V5hUMpvvE0qJxzBY8z7tJLKLrDKzEjttgQYiwoXO7Asan2l8jte9z1GRF1MR BDCS7wE/rgeIPCokfHQFYyPiRLjt2/ROoaLvwz3ufyhAu4aSXpx/TzHeWpd81+1/D3xeAIYEUXd XA7fq5z/Zfd9FLYP6Vv0brFPCqJVbYpJSrHL3dyTQog6V0ZhAjxpzyCLB1i+gafPSWCO5iJiUB3 aMm3qmaQH2R70+FNoQYrINv3AgdPs2VYBOBjdrIRPj+/S1YN/i0IBLnxyZz1CaJU/dvuMRYhX6Z nqRNYUhOzFDHwUZquib1H2++0c3ZIqVBVpCs5LXkIQBtpIJMWY6BpStFrKhKPoKsxB5D/IuRw26 C3A+6rqflGxkdduTFqg9QnlGN4jTRigVIFilFlTrvYewbfzbCL27AqsF0R+4Sb45pQLN8/zusDH UslPbKX5zhxXcW2phJBg== X-Google-Smtp-Source: AGHT+IE3km850x6VB8Rw3kN8nyohSRgqkNwJM2WQb0FNQx9vgDMtz8EqwHbBVscLsGzUW9kN9y99gw== X-Received: by 2002:a05:6a21:32a3:b0:366:14ac:e1e1 with SMTP id adf61e73a8af0-376ab2e706dmr12057880637.71.1766450202488; Mon, 22 Dec 2025 16:36:42 -0800 (PST) Received: from localhost ([2a03:2880:ff:16::]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a2f3d77359sm109251095ad.95.2025.12.22.16.36.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Dec 2025 16:36:42 -0800 (PST) From: Joanne Koong To: miklos@szeredi.hu, axboe@kernel.dk Cc: bschubert@ddn.com, asml.silence@gmail.com, io-uring@vger.kernel.org, csander@purestorage.com, xiaobing.li@samsung.com, linux-fsdevel@vger.kernel.org Subject: [PATCH v3 10/25] io_uring/kbuf: export io_ring_buffer_select() Date: Mon, 22 Dec 2025 16:35:07 -0800 Message-ID: <20251223003522.3055912-11-joannelkoong@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251223003522.3055912-1-joannelkoong@gmail.com> References: <20251223003522.3055912-1-joannelkoong@gmail.com> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Export io_ring_buffer_select() so that it may be used by callers who pass in a pinned bufring without needing to grab the io_uring mutex. This is a preparatory patch that will be needed by fuse io-uring, which will need to select a buffer from a kernel-managed bufring while the uring mutex may already be held by in-progress commits, and may need to select a buffer in atomic contexts. Signed-off-by: Joanne Koong --- include/linux/io_uring/buf.h | 25 +++++++++++++++++++++++++ io_uring/kbuf.c | 8 +++++--- 2 files changed, 30 insertions(+), 3 deletions(-) create mode 100644 include/linux/io_uring/buf.h diff --git a/include/linux/io_uring/buf.h b/include/linux/io_uring/buf.h new file mode 100644 index 000000000000..3f7426ced3eb --- /dev/null +++ b/include/linux/io_uring/buf.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _LINUX_IO_URING_BUF_H +#define _LINUX_IO_URING_BUF_H + +#include + +#if defined(CONFIG_IO_URING) +struct io_br_sel io_ring_buffer_select(struct io_kiocb *req, size_t *len, + struct io_buffer_list *bl, + unsigned int issue_flags); +#else +static inline struct io_br_sel io_ring_buffer_select(struct io_kiocb *req, + size_t *len, + struct io_buffer_list *bl, + unsigned int issue_flags) +{ + struct io_br_sel sel = { + .val = -EOPNOTSUPP, + }; + + return sel; +} +#endif /* CONFIG_IO_URING */ + +#endif /* _LINUX_IO_URING_BUF_H */ diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c index 0524b22e60a5..3b9907f0a78e 100644 --- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -9,6 +9,7 @@ #include #include #include +#include #include @@ -223,9 +224,9 @@ static bool io_should_commit(struct io_kiocb *req, struct io_buffer_list *bl, return false; } -static struct io_br_sel io_ring_buffer_select(struct io_kiocb *req, size_t *len, - struct io_buffer_list *bl, - unsigned int issue_flags) +struct io_br_sel io_ring_buffer_select(struct io_kiocb *req, size_t *len, + struct io_buffer_list *bl, + unsigned int issue_flags) { struct io_uring_buf_ring *br = bl->buf_ring; __u16 tail, head = bl->head; @@ -259,6 +260,7 @@ static struct io_br_sel io_ring_buffer_select(struct io_kiocb *req, size_t *len, } return sel; } +EXPORT_SYMBOL_GPL(io_ring_buffer_select); struct io_br_sel io_buffer_select(struct io_kiocb *req, size_t *len, unsigned buf_group, unsigned int issue_flags) -- 2.47.3