From patchwork Thu Nov 7 17:03:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bernd Schubert X-Patchwork-Id: 13866752 Received: from outbound-ip168b.ess.barracuda.com (outbound-ip168b.ess.barracuda.com [209.222.82.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C66BA216449; Thu, 7 Nov 2024 17:04:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=209.222.82.102 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730999086; cv=fail; b=ofhVJhnS5wqpLxh/mWRVXA+gfyN2jKf68WkeVSkPc/CBwHA7mIN75Gyw1BmR0pWCKGKQUI6YbXQZdyIEXNLtH49tXtrH3me2wt9UonL8zP1ZweTpgzOPPzcrsSaa8C1GZzrJnlut8yFk1AQE+6o+BIs/lxpkVKLgTmfTuVcK5IQ= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730999086; c=relaxed/simple; bh=wc2mAxs2Kxeea0Xe+wGTfRrD9ppkb/SSUYT+pcFG8uc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=F2siUIIVVn7IzqY0hQnbsAHgyXRTwlK4+kWBN3yI+tCzUUMmFdDq989PzqorXPN5vUkkQMTBNr2E4/Hzqa0mJ24oZ9woJQ4Vl7ZAXZz5BrhoeK92qh4GIzcPvZ9mSwTpgEG+IFyMl4xhPf1BJF0WdSsTF7fauZrQnA9l1IrP7bQ= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=ddn.com; spf=pass smtp.mailfrom=ddn.com; dkim=pass (1024-bit key) header.d=ddn.com header.i=@ddn.com header.b=z2fkcI7T; arc=fail smtp.client-ip=209.222.82.102 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=ddn.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ddn.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ddn.com header.i=@ddn.com header.b="z2fkcI7T" Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12lp2170.outbound.protection.outlook.com [104.47.55.170]) by mx-outbound42-115.us-east-2c.ess.aws.cudaops.com (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 07 Nov 2024 17:04:28 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=hDklKdVXN3rLdvd0+kiCFL01avAXVvjdTdnLH6vQ/SfWtDeTsIXh+QIYuMjtiRbWpzgdKPtYFyWcImeOuHlIVnQEvsujHeu4achLL+mIa+bEQ6rCDwUQGLgq/JF5YzVYpUs+xLU/SMLqHfcLUbg6MBTPhOXR0tSXKIklkpHXTFUv56AWLLfB7ZF64QfJQbx/BKLVf7+cgpz9Rux+iFArZQt7RJtJoTG53Gz7735G5rDazNea7Kw6lUdRhM55tm/CHuRu/uzW1PONx8+zoXVdZ6R0oJzPug1W/QlocVzzCgKAcm6oxzbarXv3V+pfkdvMze5OqNqyruvTWxn7JDpRYw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=lR/i5NJSgjkHp+rLMUus/APsFY7JnE4vZFJkThJqjH0=; b=NQIDFuidJBy9JthMso/ebuz2ptFrJexssSMJem5VFPJIZ68rwbjPh7vuNcX/+RxvLDC5fRQLPL53byJpGFVsojbgxxlEJpzuqWhWc/gW0GZcUYJNMnobriiO4BpkdAsiIRXS+cGblRspoMrtXZMsnNIDjZ5E4mmJ+/5qHgK6nWHsBi3gt0IXCE8kquAbuu5+bQOZ4h7gExGrUmkV1wZXUQgIHYFQMoiEgTAg7X42XVt2ysiE4QgGIynTEP4USRilmRxqPeFJOxu7YqX04E0OECXJARllkiDR8juafDxhsRTRQ0HHJGhfYGkjjjbB8Nt5IOa9VDnNL/z5fcUBhk4D9A== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 50.222.100.11) smtp.rcpttodomain=bsbernd.com smtp.mailfrom=ddn.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=ddn.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ddn.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=lR/i5NJSgjkHp+rLMUus/APsFY7JnE4vZFJkThJqjH0=; b=z2fkcI7TNmD3+mSvTMHgaXhfV7Lz7JX4SVPxIzxe67d4EyywJSmKiRkvXDYIroX72lnwujGaz6dl/gkXHbDSY5fRGjaQWpY/tQMcxdaQAwCbXem0UhqMyABduIqhIOb+PSw8qT/K3sL9PHmp3Qam1eGQt/ssNEZLYHUSV2bo/7g= Received: from MW4P222CA0023.NAMP222.PROD.OUTLOOK.COM (2603:10b6:303:114::28) by SA1PR19MB4928.namprd19.prod.outlook.com (2603:10b6:806:185::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8137.21; Thu, 7 Nov 2024 17:04:20 +0000 Received: from CO1PEPF000044F5.namprd05.prod.outlook.com (2603:10b6:303:114:cafe::c1) by MW4P222CA0023.outlook.office365.com (2603:10b6:303:114::28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8137.19 via Frontend Transport; Thu, 7 Nov 2024 17:04:20 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 50.222.100.11) smtp.mailfrom=ddn.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=ddn.com; Received-SPF: Pass (protection.outlook.com: domain of ddn.com designates 50.222.100.11 as permitted sender) receiver=protection.outlook.com; client-ip=50.222.100.11; helo=uww-mrp-01.datadirectnet.com; pr=C Received: from uww-mrp-01.datadirectnet.com (50.222.100.11) by CO1PEPF000044F5.mail.protection.outlook.com (10.167.241.75) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8137.17 via Frontend Transport; Thu, 7 Nov 2024 17:04:19 +0000 Received: from localhost (unknown [10.68.0.8]) by uww-mrp-01.datadirectnet.com (Postfix) with ESMTP id 12AC9C6; Thu, 7 Nov 2024 17:04:18 +0000 (UTC) From: Bernd Schubert Date: Thu, 07 Nov 2024 18:03:53 +0100 Subject: [PATCH RFC v5 09/16] fuse: {uring} Add uring sqe commit and fetch support Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241107-fuse-uring-for-6-10-rfc4-v5-9-e8660a991499@ddn.com> References: <20241107-fuse-uring-for-6-10-rfc4-v5-0-e8660a991499@ddn.com> In-Reply-To: <20241107-fuse-uring-for-6-10-rfc4-v5-0-e8660a991499@ddn.com> To: Miklos Szeredi Cc: Jens Axboe , Pavel Begunkov , linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, Joanne Koong , Josef Bacik , Amir Goldstein , Ming Lei , David Wei , bernd@bsbernd.com, Bernd Schubert X-Mailer: b4 0.15-dev-2a633 X-Developer-Signature: v=1; a=ed25519-sha256; t=1730999049; l=18832; i=bschubert@ddn.com; s=20240529; h=from:subject:message-id; bh=wc2mAxs2Kxeea0Xe+wGTfRrD9ppkb/SSUYT+pcFG8uc=; b=nhLmFBi+c8jODrcCM+/bc59+pMBhprKATalO8aMCub0PqGdyC10K8BoXjyCPQeAPrqezmGtz8 LqPChMm8ICJDW/c+KCyEItz0IdmzOVI5pnPOuWn+HE8e2nNGAsquV6x X-Developer-Key: i=bschubert@ddn.com; a=ed25519; pk=EZVU4bq64+flgoWFCVQoj0URAs3Urjno+1fIq9ZJx8Y= X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000044F5:EE_|SA1PR19MB4928:EE_ X-MS-Office365-Filtering-Correlation-Id: 692fd557-f271-4d93-83e0-08dcff4e386c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|82310400026|1800799024|7416014|376014; X-Microsoft-Antispam-Message-Info: =?utf-8?q?SGNVWNWgRiXUUo6XOq9xw1HCCYwdrep?= =?utf-8?q?PeNc5itF6X7FyxfeUuXtzkvb13Vj/nct/uJnu3TCg4sqdTEN5/kOVsYlqYZt79FwQ?= =?utf-8?q?0cpPkIoDURBufEojxk6uwoLRNrVU8Wb+9q+KskkdfG9SmA4CWkiarjomJqcmE5rqk?= =?utf-8?q?D3H2LOXEsEnquwPwzm0Va2qguCJ3o6cenjc9hKybvv9z4KDTOQOd9Qi3DbY7ltdhC?= =?utf-8?q?iy/X2h4o9G4yadiPmTeTT/IMoOb+qiJ7Kl0zgTJLyIMefbXdKaRk+wSfuethg6qR8?= =?utf-8?q?vmP3csmRzTfCm05QjbJBG3t5l0MZNm9rXhyTVpNedfiKZm+ldfr7+NyajzGvqNqWC?= =?utf-8?q?94TdNIhi06r4NencfPLnqwsR+ZTFYFYxXaKc0gLXvNQxFmTDlTkLNcXWaWaJ78xVu?= =?utf-8?q?DA6GCUxwj0VH/5ZTknNTlSSraI8z4jXk4Lqg5RPoRMMhKhSUCLefnzT8TmMaNoSMa?= =?utf-8?q?DW6IRSaETXSZfqe86VAbIwcSpkTrLZhWQZEV8F7Ns4GtcI52U25T04B4n5RHACZl8?= =?utf-8?q?mw1tUL2KQr+ZiMB0+gRGPvG26oLakmB6Qg9z0uQ22Z6UZkk2PIonGapC99O+We5LP?= =?utf-8?q?LU8R2MweJUuRRSIxxZWXlxVnYXDDpeJ9fGLGRyyY8waCa4vE4aAl5WRkqm1VO60rj?= =?utf-8?q?m+gOACOiNPt6PdmxRuob/QcNuag5UsaJQpHTml+MiIaR7T/xgl60McvdfSFEIVD2p?= =?utf-8?q?4w3NeOMoBM7Q6iQjwSPngz5VmfKXPXKL0VXN16ELyFcgkGvr7l3sXE5aSQXUhWE7O?= =?utf-8?q?tb+lyRvFOdl1+nd+JmueuTOSxrlvQv11peFVyDA25DIyIbWcmO1MrH5N/U1roFgnz?= =?utf-8?q?LzD4ARKEQnO5n2pqjYLFnNsPpwEXKsmZSYKN6UadQ3FRrBgQELBE7sFUY8YTtMJuB?= =?utf-8?q?CLNBZmAc1gG3ZCClP+6D5n4UCnrkTNwHv/LLUMHKNwyRvEi0QL1+vque0jYkCwjVA?= =?utf-8?q?iPcbvE/g5KLqP8xWSBv6yXqMX2mIaGpwty8+SOCX07rQodd472PQfKcy/Dlu+fDrF?= =?utf-8?q?5jHAiXtLV4yZZqm9AZkQFmFuCTVgqZ7W2Xn4NjkMhc/vrCNb69vDEzq+FsnYuYer2?= =?utf-8?q?w4hcX/FPiNVsZ+K9IY2919NLlc5eUZ0aZjAC0RzrdwACEZV/EUyIci72LjpzQN2OZ?= =?utf-8?q?P+yis2zRxJOfMTuTc/lhA5pxfb9/i8bpTBWTjqnP9JthPmpRgLtJHKPB0ohqzOIwM?= =?utf-8?q?i/muCSvMDxKdaIAgJ15YUHnpS5zaxPh41v8nOLIbmHvLvR6dNu6ERb5U8X8b9PjbK?= =?utf-8?q?28o2+mEsxC0bNhxa2ZY2fLlvrxKNAlZb/q/diG71tFk21mvMpCb78PkNR1m3kwGfP?= =?utf-8?q?WPRtXZXmnsYCSc9OAfDDTFIRSBaGMynttQ=3D=3D?= X-Forefront-Antispam-Report: CIP:50.222.100.11;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:uww-mrp-01.datadirectnet.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(36860700013)(82310400026)(1800799024)(7416014)(376014);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: ddn.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Nov 2024 17:04:19.7998 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 692fd557-f271-4d93-83e0-08dcff4e386c X-MS-Exchange-CrossTenant-Id: 753b6e26-6fd3-43e6-8248-3f1735d59bb4 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=753b6e26-6fd3-43e6-8248-3f1735d59bb4;Ip=[50.222.100.11];Helo=[uww-mrp-01.datadirectnet.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000044F5.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR19MB4928 X-BESS-ID: 1730999068-110867-12758-13482-1 X-BESS-VER: 2019.1_20241029.2310 X-BESS-Apparent-Source-IP: 104.47.55.170 X-BESS-Parts: H4sIAAAAAAACA4uuVkqtKFGyUioBkjpK+cVKVoYWhuYGQGYGUDTN2NjY3MIwzR xIG5qmmaclJhqlGhobGqQYW5oYpJko1cYCAJ3hzPJCAAAA X-BESS-Outbound-Spam-Score: 0.50 X-BESS-Outbound-Spam-Report: Code version 3.2, rules version 3.2.2.260269 [from cloudscan8-205.us-east-2a.ess.aws.cudaops.com] Rule breakdown below pts rule name description ---- ---------------------- -------------------------------- 0.50 BSF_RULE7568M META: Custom Rule 7568M 0.00 BSF_BESS_OUTBOUND META: BESS Outbound X-BESS-Outbound-Spam-Status: SCORE=0.50 using account:ESS124931 scores of KILL_LEVEL=7.0 tests=BSF_RULE7568M, BSF_BESS_OUTBOUND X-BESS-BRTS-Status: 1 This adds support for fuse request completion through ring SQEs (FUSE_URING_REQ_COMMIT_AND_FETCH handling). After committing the ring entry it becomes available for new fuse requests. Handling of requests through the ring (SQE/CQE handling) is complete now. Fuse request data are copied through the mmaped ring buffer, there is no support for any zero copy yet. Signed-off-by: Bernd Schubert --- fs/fuse/dev.c | 6 +- fs/fuse/dev_uring.c | 449 ++++++++++++++++++++++++++++++++++++++++++++++++++ fs/fuse/dev_uring_i.h | 11 ++ fs/fuse/fuse_dev_i.h | 7 +- fs/fuse/fuse_i.h | 9 + fs/fuse/inode.c | 2 +- 6 files changed, 479 insertions(+), 5 deletions(-) diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 4ca67c8ae0e28072383478d6ee7ad7791566b6ce..b085176ea824bd612a8736e00c9b6f8f9e232208 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -188,7 +188,7 @@ u64 fuse_get_unique(struct fuse_iqueue *fiq) } EXPORT_SYMBOL_GPL(fuse_get_unique); -static unsigned int fuse_req_hash(u64 unique) +unsigned int fuse_req_hash(u64 unique) { return hash_long(unique & ~FUSE_INT_REQ_BIT, FUSE_PQ_HASH_BITS); } @@ -1860,7 +1860,7 @@ static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, } /* Look up request on processing list by unique ID */ -static struct fuse_req *request_find(struct fuse_pqueue *fpq, u64 unique) +struct fuse_req *fuse_request_find(struct fuse_pqueue *fpq, u64 unique) { unsigned int hash = fuse_req_hash(unique); struct fuse_req *req; @@ -1944,7 +1944,7 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud, spin_lock(&fpq->lock); req = NULL; if (fpq->connected) - req = request_find(fpq, oh.unique & ~FUSE_INT_REQ_BIT); + req = fuse_request_find(fpq, oh.unique & ~FUSE_INT_REQ_BIT); err = -ENOENT; if (!req) { diff --git a/fs/fuse/dev_uring.c b/fs/fuse/dev_uring.c index ce0a41b00613133ea1b8062290bc960b95254ac9..4f8a0bd1e2192bfbc310eb53dd8e89274e6f479b 100644 --- a/fs/fuse/dev_uring.c +++ b/fs/fuse/dev_uring.c @@ -19,6 +19,24 @@ MODULE_PARM_DESC(enable_uring, "Enable uring userspace communication through uring."); #endif +#define FUSE_URING_IOV_SEGS 2 /* header and payload */ + +/* + * Finalize a fuse request, then fetch and send the next entry, if available + */ +static void fuse_uring_req_end(struct fuse_ring_ent *ring_ent, bool set_err, + int error) +{ + struct fuse_req *req = ring_ent->fuse_req; + + if (set_err) + req->out.h.error = error; + + clear_bit(FR_SENT, &req->flags); + fuse_request_end(ring_ent->fuse_req); + ring_ent->fuse_req = NULL; +} + static int fuse_ring_ent_unset_userspace(struct fuse_ring_ent *ent) { struct fuse_ring_queue *queue = ent->queue; @@ -50,7 +68,9 @@ void fuse_uring_destruct(struct fuse_conn *fc) WARN_ON(!list_empty(&queue->ent_avail_queue)); WARN_ON(!list_empty(&queue->ent_intermediate_queue)); + WARN_ON(!list_empty(&queue->ent_in_userspace)); + kfree(queue->fpq.processing); kfree(queue); ring->queues[qid] = NULL; } @@ -109,13 +129,21 @@ static struct fuse_ring_queue *fuse_uring_create_queue(struct fuse_ring *ring, { struct fuse_conn *fc = ring->fc; struct fuse_ring_queue *queue; + struct list_head *pq; queue = kzalloc(sizeof(*queue), GFP_KERNEL_ACCOUNT); if (!queue) return ERR_PTR(-ENOMEM); + pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL); + if (!pq) { + kfree(queue); + return ERR_PTR(-ENOMEM); + } + spin_lock(&fc->lock); if (ring->queues[qid]) { spin_unlock(&fc->lock); + kfree(queue->fpq.processing); kfree(queue); return ring->queues[qid]; } @@ -127,12 +155,244 @@ static struct fuse_ring_queue *fuse_uring_create_queue(struct fuse_ring *ring, INIT_LIST_HEAD(&queue->ent_avail_queue); INIT_LIST_HEAD(&queue->ent_intermediate_queue); + INIT_LIST_HEAD(&queue->ent_in_userspace); + INIT_LIST_HEAD(&queue->fuse_req_queue); + + queue->fpq.processing = pq; + fuse_pqueue_init(&queue->fpq); spin_unlock(&fc->lock); return queue; } +static void +fuse_uring_async_send_to_ring(struct io_uring_cmd *cmd, + unsigned int issue_flags) +{ + io_uring_cmd_done(cmd, 0, 0, issue_flags); +} + +/* + * Checks for errors and stores it into the request + */ +static int fuse_uring_out_header_has_err(struct fuse_out_header *oh, + struct fuse_req *req, + struct fuse_conn *fc) +{ + int err; + + if (oh->unique == 0) { + /* Not supportd through request based uring, this needs another + * ring from user space to kernel + */ + pr_warn("Unsupported fuse-notify\n"); + err = -EINVAL; + goto seterr; + } + + if (oh->error <= -512 || oh->error > 0) { + err = -EINVAL; + goto seterr; + } + + if (oh->error) { + err = oh->error; + pr_devel("%s:%d err=%d op=%d req-ret=%d", __func__, __LINE__, + err, req->args->opcode, req->out.h.error); + goto err; /* error already set */ + } + + if ((oh->unique & ~FUSE_INT_REQ_BIT) != req->in.h.unique) { + pr_warn("Unpexted seqno mismatch, expected: %llu got %llu\n", + req->in.h.unique, oh->unique & ~FUSE_INT_REQ_BIT); + err = -ENOENT; + goto seterr; + } + + /* Is it an interrupt reply ID? */ + if (oh->unique & FUSE_INT_REQ_BIT) { + err = 0; + if (oh->error == -ENOSYS) + fc->no_interrupt = 1; + else if (oh->error == -EAGAIN) { + /* XXX Interrupts not handled yet */ + /* err = queue_interrupt(req); */ + pr_warn("Intrerupt EAGAIN not supported yet"); + err = -EINVAL; + } + + goto seterr; + } + + return 0; + +seterr: + pr_devel("%s:%d err=%d op=%d req-ret=%d", __func__, __LINE__, err, + req->args->opcode, req->out.h.error); + oh->error = err; +err: + return err; +} + +static int fuse_uring_copy_from_ring(struct fuse_ring *ring, + struct fuse_req *req, + struct fuse_ring_ent *ent) +{ + struct fuse_copy_state cs; + struct fuse_args *args = req->args; + struct iov_iter iter; + int err; + int res_arg_len; + + err = copy_from_user(&res_arg_len, &ent->headers->in_out_arg_len, + sizeof(res_arg_len)); + if (err) + return err; + + err = import_ubuf(ITER_SOURCE, ent->payload, ent->max_arg_len, &iter); + if (err) + return err; + + fuse_copy_init(&cs, 0, &iter); + cs.is_uring = 1; + cs.req = req; + + return fuse_copy_out_args(&cs, args, res_arg_len); +} + + /* + * Copy data from the req to the ring buffer + */ +static int fuse_uring_copy_to_ring(struct fuse_ring *ring, struct fuse_req *req, + struct fuse_ring_ent *ent) +{ + struct fuse_copy_state cs; + struct fuse_args *args = req->args; + struct fuse_in_arg *in_args = args->in_args; + int num_args = args->in_numargs; + int err, res; + struct iov_iter iter; + + if (num_args == 0) + return 0; + + err = import_ubuf(ITER_DEST, ent->payload, ent->max_arg_len, &iter); + if (err) { + pr_info_ratelimited("Import user buffer failed\n"); + return err; + } + + fuse_copy_init(&cs, 1, &iter); + cs.is_uring = 1; + cs.req = req; + + /* + * Expectation is that the first argument is the header, for some + * operations it might be zero. + */ + if (args->in_args[0].size > 0) { + res = copy_to_user(&ent->headers->op_in, in_args->value, + in_args->size); + err = res > 0 ? -EFAULT : res; + if (err) { + pr_info_ratelimited("Copying the header failed.\n"); + return err; + } + } + + /* Skip the already handled header */ + in_args++; + num_args--; + + err = fuse_copy_args(&cs, num_args, args->in_pages, + (struct fuse_arg *)in_args, 0); + if (err) { + pr_info_ratelimited("%s fuse_copy_args failed\n", __func__); + return err; + } + + BUILD_BUG_ON((sizeof(ent->headers->in_out_arg_len) != + sizeof(cs.ring.offset))); + res = copy_to_user(&ent->headers->in_out_arg_len, &cs.ring.offset, + sizeof(ent->headers->in_out_arg_len)); + err = res > 0 ? -EFAULT : res; + if (err) + return err; + + return 0; +} + +static int +fuse_uring_prepare_send(struct fuse_ring_ent *ring_ent) +{ + struct fuse_ring_queue *queue = ring_ent->queue; + struct fuse_ring *ring = queue->ring; + struct fuse_req *req = ring_ent->fuse_req; + int err = 0, res; + + if (WARN_ON(ring_ent->state != FRRS_FUSE_REQ)) { + pr_err("qid=%d ring-req=%p invalid state %d on send\n", + queue->qid, ring_ent, ring_ent->state); + err = -EIO; + } + + if (err) + return err; + + pr_devel("%s qid=%d state=%d cmd-done op=%d unique=%llu\n", __func__, + queue->qid, ring_ent->state, req->in.h.opcode, + req->in.h.unique); + + /* copy the request */ + err = fuse_uring_copy_to_ring(ring, req, ring_ent); + if (unlikely(err)) { + pr_info("Copy to ring failed: %d\n", err); + goto err; + } + + /* copy fuse_in_header */ + res = copy_to_user(&ring_ent->headers->in, &req->in.h, + sizeof(req->in.h)); + err = res > 0 ? -EFAULT : res; + if (err) + goto err; + + set_bit(FR_SENT, &req->flags); + return 0; + +err: + fuse_uring_req_end(ring_ent, true, err); + return err; +} + +/* + * Write data to the ring buffer and send the request to userspace, + * userspace will read it + * This is comparable with classical read(/dev/fuse) + */ +static int fuse_uring_send_next_to_ring(struct fuse_ring_ent *ring_ent) +{ + int err = 0; + struct fuse_ring_queue *queue = ring_ent->queue; + + err = fuse_uring_prepare_send(ring_ent); + if (err) + goto err; + + spin_lock(&queue->lock); + ring_ent->state = FRRS_USERSPACE; + list_move(&ring_ent->list, &queue->ent_in_userspace); + spin_unlock(&queue->lock); + + io_uring_cmd_complete_in_task(ring_ent->cmd, + fuse_uring_async_send_to_ring); + return 0; + +err: + return err; +} + /* * Put a ring request onto hold, it is no longer used for now. */ @@ -159,6 +419,192 @@ static void fuse_uring_ent_avail(struct fuse_ring_ent *ring_ent, ring_ent->state = FRRS_WAIT; } +/* Used to find the request on SQE commit */ +static void fuse_uring_add_to_pq(struct fuse_ring_ent *ring_ent) +{ + struct fuse_ring_queue *queue = ring_ent->queue; + struct fuse_req *req = ring_ent->fuse_req; + struct fuse_pqueue *fpq = &queue->fpq; + unsigned int hash; + + hash = fuse_req_hash(req->in.h.unique); + list_move_tail(&req->list, &fpq->processing[hash]); + req->ring_entry = ring_ent; +} + +/* + * Assign a fuse queue entry to the given entry + */ +static void fuse_uring_add_req_to_ring_ent(struct fuse_ring_ent *ring_ent, + struct fuse_req *req) +{ + lockdep_assert_held(&ring_ent->queue->lock); + + if (WARN_ON_ONCE(ring_ent->state != FRRS_WAIT && + ring_ent->state != FRRS_COMMIT)) { + pr_warn("%s qid=%d state=%d\n", __func__, ring_ent->queue->qid, + ring_ent->state); + } + list_del_init(&req->list); + clear_bit(FR_PENDING, &req->flags); + ring_ent->fuse_req = req; + ring_ent->state = FRRS_FUSE_REQ; + + fuse_uring_add_to_pq(ring_ent); +} + +/* + * Release the ring entry and fetch the next fuse request if available + * + * @return true if a new request has been fetched + */ +static bool fuse_uring_ent_assign_req(struct fuse_ring_ent *ring_ent) + __must_hold(&queue->lock) +{ + struct fuse_req *req = NULL; + struct fuse_ring_queue *queue = ring_ent->queue; + struct list_head *req_queue = &queue->fuse_req_queue; + + lockdep_assert_held(&queue->lock); + + /* get and assign the next entry while it is still holding the lock */ + if (!list_empty(req_queue)) { + req = list_first_entry(req_queue, struct fuse_req, list); + fuse_uring_add_req_to_ring_ent(ring_ent, req); + list_move(&ring_ent->list, &queue->ent_intermediate_queue); + } + + return req ? true : false; +} + +/* + * Read data from the ring buffer, which user space has written to + * This is comparible with handling of classical write(/dev/fuse). + * Also make the ring request available again for new fuse requests. + */ +static void fuse_uring_commit(struct fuse_ring_ent *ring_ent, + unsigned int issue_flags) +{ + struct fuse_ring *ring = ring_ent->queue->ring; + struct fuse_conn *fc = ring->fc; + struct fuse_req *req = ring_ent->fuse_req; + ssize_t err = 0; + bool set_err = false; + + err = copy_from_user(&req->out.h, &ring_ent->headers->out, + sizeof(req->out.h)); + if (err) { + req->out.h.error = err; + goto out; + } + + err = fuse_uring_out_header_has_err(&req->out.h, req, fc); + if (err) { + /* req->out.h.error already set */ + pr_devel("%s:%d err=%zd oh->err=%d\n", __func__, __LINE__, err, + req->out.h.error); + goto out; + } + + err = fuse_uring_copy_from_ring(ring, req, ring_ent); + if (err) + set_err = true; + +out: + pr_devel("%s:%d ret=%zd op=%d req-ret=%d\n", __func__, __LINE__, err, + req->args->opcode, req->out.h.error); + fuse_uring_req_end(ring_ent, set_err, err); +} + +/* + * Get the next fuse req and send it + */ +static void fuse_uring_next_fuse_req(struct fuse_ring_ent *ring_ent, + struct fuse_ring_queue *queue) +{ + int has_next, err; + int prev_state = ring_ent->state; + + do { + spin_lock(&queue->lock); + has_next = fuse_uring_ent_assign_req(ring_ent); + if (!has_next) { + fuse_uring_ent_avail(ring_ent, queue); + spin_unlock(&queue->lock); + break; /* no request left */ + } + spin_unlock(&queue->lock); + + err = fuse_uring_send_next_to_ring(ring_ent); + if (err) + ring_ent->state = prev_state; + } while (err); +} + +/* FUSE_URING_REQ_COMMIT_AND_FETCH handler */ +static int fuse_uring_commit_fetch(struct io_uring_cmd *cmd, int issue_flags, + struct fuse_conn *fc) +{ + const struct fuse_uring_cmd_req *cmd_req = io_uring_sqe_cmd(cmd->sqe); + struct fuse_ring_ent *ring_ent; + int err; + struct fuse_ring *ring = fc->ring; + struct fuse_ring_queue *queue; + uint64_t commit_id = cmd_req->commit_id; + struct fuse_pqueue fpq; + struct fuse_req *req; + + err = -ENOTCONN; + if (!ring) + return err; + + queue = ring->queues[cmd_req->qid]; + if (!queue) + return err; + fpq = queue->fpq; + + spin_lock(&queue->lock); + /* Find a request based on the unique ID of the fuse request + * This should get revised, as it needs a hash calculation and list + * search. And full struct fuse_pqueue is needed (memory overhead). + * As well as the link from req to ring_ent. + */ + req = fuse_request_find(&fpq, commit_id); + err = -ENOENT; + if (!req) { + pr_info("qid=%d commit_id %llu not found\n", queue->qid, + commit_id); + spin_unlock(&queue->lock); + return err; + } + list_del_init(&req->list); + ring_ent = req->ring_entry; + req->ring_entry = NULL; + + err = fuse_ring_ent_unset_userspace(ring_ent); + if (err != 0) { + pr_info_ratelimited("qid=%d commit_id %llu state %d", + queue->qid, commit_id, ring_ent->state); + spin_unlock(&queue->lock); + return err; + } + + ring_ent->cmd = cmd; + spin_unlock(&queue->lock); + + /* without the queue lock, as other locks are taken */ + fuse_uring_commit(ring_ent, issue_flags); + + /* + * Fetching the next request is absolutely required as queued + * fuse requests would otherwise not get processed - committing + * and fetching is done in one step vs legacy fuse, which has separated + * read (fetch request) and write (commit result). + */ + fuse_uring_next_fuse_req(ring_ent, queue); + return 0; +} + /* * fuse_uring_req_fetch command handling */ @@ -333,6 +779,9 @@ int fuse_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags) if (err) pr_info_once("fuse_uring_fetch failed err=%d\n", err); break; + case FUSE_URING_REQ_COMMIT_AND_FETCH: + err = fuse_uring_commit_fetch(cmd, issue_flags, fc); + break; default: err = -EINVAL; pr_devel("Unknown uring command %d", cmd_op); diff --git a/fs/fuse/dev_uring_i.h b/fs/fuse/dev_uring_i.h index 11798080896372c72692228ff7072bbee6a63e53..c7bac19e91b781fc9ccce540e39d99b39b751f6b 100644 --- a/fs/fuse/dev_uring_i.h +++ b/fs/fuse/dev_uring_i.h @@ -19,6 +19,9 @@ enum fuse_ring_req_state { /* The ring request waits for a new fuse request */ FRRS_WAIT, + /* The ring req got assigned a fuse req */ + FRRS_FUSE_REQ, + /* request is in or on the way to user space */ FRRS_USERSPACE, }; @@ -72,6 +75,14 @@ struct fuse_ring_queue { * to be send to userspace */ struct list_head ent_intermediate_queue; + + /* entries in userspace */ + struct list_head ent_in_userspace; + + /* fuse requests waiting for an entry slot */ + struct list_head fuse_req_queue; + + struct fuse_pqueue fpq; }; /** diff --git a/fs/fuse/fuse_dev_i.h b/fs/fuse/fuse_dev_i.h index 7ecb103af6f0feca99eb8940872c6a5ccf2e5186..a8d578b99a14239c05b4a496a4b3b1396eb768dd 100644 --- a/fs/fuse/fuse_dev_i.h +++ b/fs/fuse/fuse_dev_i.h @@ -7,7 +7,7 @@ #define _FS_FUSE_DEV_I_H #include - +#include /* Ordinary requests have even IDs, while interrupts IDs are odd */ #define FUSE_INT_REQ_BIT (1ULL << 0) @@ -15,6 +15,8 @@ struct fuse_arg; struct fuse_args; +struct fuse_pqueue; +struct fuse_req; struct fuse_copy_state { int write; @@ -44,6 +46,9 @@ static inline struct fuse_dev *fuse_get_dev(struct file *file) return READ_ONCE(file->private_data); } +unsigned int fuse_req_hash(u64 unique); +struct fuse_req *fuse_request_find(struct fuse_pqueue *fpq, u64 unique); + void fuse_dev_end_requests(struct list_head *head); void fuse_copy_init(struct fuse_copy_state *cs, int write, diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 91c2e7e35cdbd470894a8a9cd026b77368b7a4b6..8bb6bd1854e41afb52a0d0081fa5fc6bfdfa58d8 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -435,6 +435,10 @@ struct fuse_req { /** fuse_mount this request belongs to */ struct fuse_mount *fm; + +#ifdef CONFIG_FUSE_IO_URING + void *ring_entry; +#endif }; struct fuse_iqueue; @@ -1207,6 +1211,11 @@ void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o); */ struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); +/** + * Initialize the fuse processing queue + */ +void fuse_pqueue_init(struct fuse_pqueue *fpq); + /** * Initialize fuse_conn */ diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 59f8fb7b915f052f892d587a0f9a8dc17cf750ce..a1179c1e212b7a1cfd6e69f20dd5fcbe18c6202b 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -894,7 +894,7 @@ static void fuse_iqueue_init(struct fuse_iqueue *fiq, fiq->priv = priv; } -static void fuse_pqueue_init(struct fuse_pqueue *fpq) +void fuse_pqueue_init(struct fuse_pqueue *fpq) { unsigned int i;