From mboxrd@z Thu Jan 1 00:00:00 1970 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 386DC156E4 for ; Wed, 16 Oct 2024 00:39:52 +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=1729039194; cv=fail; b=B9QyyU1Sges+y8ABkOIqp1NeQnV0Qs+FGsO7Q4RCses4QBH0YHMJpwtAPsz6kinSBLmv1qqim1T/fnNS/Idcr1XWSfZOorO7St1FN67GDshgqbO7pLLpQGMK8p/A5aRviYNamq7k2S84AvzWak58FxIZO5U/HPuR3N9KSbU9QGI= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729039194; c=relaxed/simple; bh=Xyu4lzOIYK3rydC7fD7Qp2upw2uHgx6RcLTassdicXk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=djxJ4LO61OjR1+QHtWCtczRlumlaSRlQ4/G8QKlH0BW9pJR8CnAXCOuvHnwdGrSKf2cCTUR6UFd89yt6ut6ucZ6hvjKiGLwMSrBArnCX6n5qTCxstxofkRyk9hTSGr/QQyaDwbD7PEj2s3NrLXEqZvrDj3cmf8v0ljU2lh6aX5s= 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=Bwf0fltm; 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="Bwf0fltm" Received: from NAM04-DM6-obe.outbound.protection.outlook.com (mail-dm6nam04lp2041.outbound.protection.outlook.com [104.47.73.41]) by mx-outbound-ea22-15.us-east-2b.ess.aws.cudaops.com (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 16 Oct 2024 00:39:50 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=DHwKe0BQwZ8MNwQNOIZPp+5xbJ8CZoXzTXk3WHlHuuJF3DzX1CvTPfHQsS/yFKiI3kSQhSqFKRpD1xiqXnC1u1AhSHn6a6rcfG5lCTCw8DcAA3MRw6I3PfnsDdgvniz1NfAGzOOXifVkr5hvJfltASbkuh8LH3vamyhItGnOKRggQKH33cLHYhFBA3N/9mVOhePYOAMxzTB9ZWR1eGeo/04nnO6XrCdHUUBGnLt4BN9adxIkC9iqqNYCCpEfVCtPc+o57GU7ssoGviV5y3e8n6W62TnKJZtifYHqo4N5lzAdjNWG125oPytXXcTMHlDFtvm/Afi8sZ1s6SoQJ+dN8A== 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=N41cDtaw3XrpYKhdfFo1lNO2AIt7smgvknmSUcdyQ4I=; b=axlAlQlNSQ2Wzz+ICadaI9beB7XDJGNZxe72TeTP3X9u0A1vA3bScwJ0TdH+kJyxJ6iMRAPCcZX5pds9t6ggCWG4oVoGpwp8v57Smte+zKn9W0PwDcMap0GAv94NrJcbnjMrZX0kFbCAkbk3ds633RDg/PD0R/Ttz7zcJt7BTAD0kWbMcVy5U1KbO1FHXWBEN6TzwtiVZ+GGhw4cpN5uuhQi+GMUBL4nHH66SntGS5QoeBKmNVyocJLSnYJIAWRLbXSsQlYdgRuhAwptE7rVycZEtyFVBxi0E3JZmuuyzI6WwRlrvotRzQgIfIjj/A+PUJpq1ZXJ2GndWJtRB+4fXA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 50.222.100.11) smtp.rcpttodomain=ddn.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=N41cDtaw3XrpYKhdfFo1lNO2AIt7smgvknmSUcdyQ4I=; b=Bwf0fltm5qSmGr1z/691KSB3ZohdPXuZKz2hmisnRoVdmJHTm3OfR2gcD1vQNOVMJGeM1/HFGYIpVauMTb6/7GUHuXdvPcxhXiYlvk0AnjmRDeZKee/DICwOQbV+4/MD7kFZnvrhyImYXDAmr5c5gLx3SJB6RiEfB7UfnGEjGlw= Received: from SN6PR2101CA0024.namprd21.prod.outlook.com (2603:10b6:805:106::34) by MW5PR19MB5506.namprd19.prod.outlook.com (2603:10b6:303:192::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8048.26; Wed, 16 Oct 2024 00:05:33 +0000 Received: from SN1PEPF000397B3.namprd05.prod.outlook.com (2603:10b6:805:106:cafe::9e) by SN6PR2101CA0024.outlook.office365.com (2603:10b6:805:106::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8093.5 via Frontend Transport; Wed, 16 Oct 2024 00:05:32 +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 SN1PEPF000397B3.mail.protection.outlook.com (10.167.248.57) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8069.17 via Frontend Transport; Wed, 16 Oct 2024 00:05:32 +0000 Received: from localhost (unknown [10.68.0.8]) by uww-mrp-01.datadirectnet.com (Postfix) with ESMTP id BBF0929; Wed, 16 Oct 2024 00:05:31 +0000 (UTC) From: Bernd Schubert Date: Wed, 16 Oct 2024 02:05:20 +0200 Subject: [PATCH RFC v4 08/15] fuse: {uring} Add uring sqe commit and fetch support Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20241016-fuse-uring-for-6-10-rfc4-v4-8-9739c753666e@ddn.com> References: <20241016-fuse-uring-for-6-10-rfc4-v4-0-9739c753666e@ddn.com> In-Reply-To: <20241016-fuse-uring-for-6-10-rfc4-v4-0-9739c753666e@ddn.com> To: Miklos Szeredi Cc: Jens Axboe , Pavel Begunkov , linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, Joanne Koong , Amir Goldstein , Ming Lei , Bernd Schubert X-Mailer: b4 0.15-dev-2a633 X-Developer-Signature: v=1; a=ed25519-sha256; t=1729037122; l=18785; i=bschubert@ddn.com; s=20240529; h=from:subject:message-id; bh=Xyu4lzOIYK3rydC7fD7Qp2upw2uHgx6RcLTassdicXk=; b=WRqbtKM51kkY7AUij2BYE+0w3Yi3qrihVV8Itop01JgjVfbSB2WKvR/u9wN/0SkVtSjdhylrD UlhkQROQ5aICkzL8TcSCO0HueBBNTXYRoI7UNPpVlbEnXuSxOU9uF7s X-Developer-Key: i=bschubert@ddn.com; a=ed25519; pk=EZVU4bq64+flgoWFCVQoj0URAs3Urjno+1fIq9ZJx8Y= X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF000397B3:EE_|MW5PR19MB5506:EE_ X-MS-Office365-Filtering-Correlation-Id: f0a784b8-4142-43d2-86a9-08dced7640bc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700013|1800799024|82310400026; X-Microsoft-Antispam-Message-Info: =?utf-8?B?ZlVLNEVmUWZzRkppTDNONkg3eWZNNWdCK0NCd2daMnRDMTdWdUtXdGN5NG5U?= =?utf-8?B?SVdObVQvRG0yLzdYZmdtZllINFNrSWd6YmgyQkxBMGtoUWt3Y0dMUzhOZnZW?= =?utf-8?B?VzJNak5EUUVEcUg1TlQrM0Q1SXByV2taSENXK1VveUFRRVBHSHJ4VHh4RTdS?= =?utf-8?B?WVorMHczRWhna1lBTU9Pc0Z4bHZodHI1L2IwTmlkQ1Y0OWZiWXEwTStDODdy?= =?utf-8?B?TkZhbDVMRWMxRkUyczdBSWdmc01QcEh0bTJqTVBIR0htSm42aDBDMjRRQmlj?= =?utf-8?B?enpjZTRnRDRtT0c3M2Q1M1dIK3hLZS9jRGdRWXZBcjdEMUJkTWhBTmdyME03?= =?utf-8?B?MnlCa0RuUHdRUGljd0d3ZDE4YVdROXMvN0tFTkhqYmhhdXRtOVMvWDc5dUlo?= =?utf-8?B?SWswYktlUzg4aE5rWnk0OUFtU0V3bHBJdFg4dGVJRWZmVWpnWVVGU3hkMHZ0?= =?utf-8?B?RTcxTFVMc1B5MUJDQTcyRG1vcTFCR21jR0MvTlV1TDQrUjNONFNaWnQydDBi?= =?utf-8?B?M1lKcFk3YkhYU0dnR3VoUWxhcnhPWG9XYk1pOCtISWFyTW1hNjRLZnBoOWNo?= =?utf-8?B?N25ITmg0YzhQWU02MGRWaGpRVW0vZWQvOEs0UHU2STVnT2pxUDBFV29Sa3Js?= =?utf-8?B?ZDZCeVE2VVU1bEg2UXkvWkVDUXBBczJIRzF1QXpOR0E1S0ZDclhqZ3BoUjMz?= =?utf-8?B?RGdoZTNPOVNBTlgyU1JWeVhnUUxvLzUvSnpOcjdDN1UwMy9XRG9EYlhHR1Vz?= =?utf-8?B?R2l1VWg3VlQ3cER5T1N6bElrZTZvTE1veXk4TG9FRmxzSldoQTYrcWIxMnR6?= =?utf-8?B?MjFtbXFUNTg2Wmo2eTYrOVQxNmNwSmZTTGw2WjhrS1dnSFZQTzltb2tidWNY?= =?utf-8?B?cGw3NEhZem1odGpqNExpc3FGR3E2ak9oajhzZmlsTWp0Ky9WTUVlUzdubHFI?= =?utf-8?B?WDlOM21CMWl3ZTVibFpVZU1QazRkWlAvc05XaE5pVGUyaFpXbmZmc3JNbkFy?= =?utf-8?B?S3JId3NuelA5YXIwU2NYQ0R2MGVRdDhSYUM4anBXTnEvN0lQRW5DUW9hRUl0?= =?utf-8?B?WWliOGcxWjIzemp1MzhxOTdZdVI4bVpmQkg1MHY2NnI4OHFBemRwSGRtSnM3?= =?utf-8?B?OTUyUm00N29aTTJHYTg0NUFUaEJuTy9nRDQyZEQ2S29NeXpSankwYS9vUGdN?= =?utf-8?B?aS9aa2JvQXl3cTU0TlEvZ3ExcTZna0N1cHVXQUFPKy9ocjM3RGMrMUlZZVRN?= =?utf-8?B?bEVHODdiUUxTcW1vT04xbDhKdTE2U2lOQ1NFNWFyMzRVYVZGUytTTmI1S1VM?= =?utf-8?B?TGNVZUErZ0svbTJKRGQ5eWpSRkcyUFpKVGhGWTZ0cWRVYTF5em95MWdwc2ZE?= =?utf-8?B?QmhMNUo5czh5QVgxR01VeG9iV2hGaUtydW5NTGRuMWpncU1HRm1WOWtSUUF6?= =?utf-8?B?a2ZUc2dLa0hOQUY3TzJMeWxKMUlzVXdVRE9samNLNm1IRFF0QVdLR3Q3NDVC?= =?utf-8?B?TVB3bG1qeTVuaDJ1Nm80OXErWlFjUXNpNlpTMFdyVXpPUmZFVEczeTNFdG01?= =?utf-8?B?ampFSUpFejlmRWdKemQ3TU93UkNGT0FJYVNrQ2Z6UktTZzhUV2tJQnhoa1RU?= =?utf-8?B?RERlbG5PVGJTbVlSY0RiUWxXY2pKc0w5c1hUSy9Xbm9IRUxzSGg3bkI5eWxC?= =?utf-8?B?VlpySXZ2UmpSZDNBZlZpRDI0OVFWZm9jUG5aWk01SnNIRVBxczVDMWdLR2Vz?= =?utf-8?B?NjE4OE1IdXUvMEhKMmtYWWNXS2JXV2FHejN1cjU1ZlF1NWZLKzZnUUhBMW94?= =?utf-8?B?ZzFOR3lkMFl1aWFmZjEzWFhENVg3eVZwV3ZJL2hhYm1Ha0pYNEo1Sm1Pbktl?= =?utf-8?Q?syv8TTYXmHZyd?= 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)(376014)(36860700013)(1800799024)(82310400026);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2024 00:05:32.6851 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f0a784b8-4142-43d2-86a9-08dced7640bc 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: SN1PEPF000397B3.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW5PR19MB5506 X-OriginatorOrg: ddn.com X-BESS-ID: 1729039190-105647-17923-34648-1 X-BESS-VER: 2019.3_20241015.1555 X-BESS-Apparent-Source-IP: 104.47.73.41 X-BESS-Parts: H4sIAAAAAAACA4uuVkqtKFGyUioBkjpK+cVKVoYWhsbGQGYGUNTQ0tDYwszAON koMdEw1Sgxxdw8ydTQJM3Q1CjR3DzRXKk2FgDpjgbwQgAAAA== X-BESS-Outbound-Spam-Score: 0.50 X-BESS-Outbound-Spam-Report: Code version 3.2, rules version 3.2.2.259752 [from cloudscan21-66.us-east-2b.ess.aws.cudaops.com] Rule breakdown below pts rule name description ---- ---------------------- -------------------------------- 0.00 BSF_SC0_MISMATCH_TO META: Envelope rcpt doesn't match header 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_SC0_MISMATCH_TO, 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 | 430 ++++++++++++++++++++++++++++++++++++++++++++++++++ fs/fuse/dev_uring_i.h | 13 ++ fs/fuse/fuse_dev_i.h | 7 +- fs/fuse/fuse_i.h | 9 ++ fs/fuse/inode.c | 2 +- 6 files changed, 462 insertions(+), 5 deletions(-) diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 12836b44de9164e750f2a5f4c4d78c5c934a32b4..fdb43640db5fdbe6b6232e1b2e2259e3117d237d 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); } @@ -1844,7 +1844,7 @@ 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; @@ -1929,7 +1929,7 @@ 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 724ac6ae67d301a7bdc5b36a20d620ff8be63b18..0c39d5c1c62a1c496782e5c54b9f72a70cffdfa2 100644 --- a/fs/fuse/dev_uring.c +++ b/fs/fuse/dev_uring.c @@ -19,6 +19,22 @@ MODULE_PARM_DESC(enable_uring, "Enable uring userspace communication through uring."); #endif +/* + * 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_ring_ent_unset_userspace(struct fuse_ring_ent *ent) { struct fuse_ring_queue *queue = ent->queue; @@ -50,7 +66,9 @@ 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; } @@ -107,6 +125,7 @@ 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) @@ -114,6 +133,7 @@ static struct fuse_ring_queue *fuse_uring_create_queue(struct fuse_ring *ring, spin_lock(&fc->lock); if (ring->queues[qid]) { spin_unlock(&fc->lock); + kfree(queue->fpq.processing); kfree(queue); return ring->queues[qid]; } @@ -125,12 +145,228 @@ 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); + + pq = kcalloc(FUSE_PQ_HASH_SIZE, sizeof(struct list_head), GFP_KERNEL); + if (!pq) { + kfree(queue); + return ERR_PTR(-ENOMEM); + } + 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: + pr_devel("%s:%d err=%d op=%d req-ret=%d", __func__, __LINE__, err, + req->args->opcode, req->out.h.error); + return err; +} + +static int fuse_uring_copy_from_ring(struct fuse_ring *ring, + struct fuse_req *req, + struct fuse_ring_ent *ent) +{ + struct fuse_ring_req __user *rreq = ent->rreq; + 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, &rreq->in_out_arg_len, + sizeof(res_arg_len)); + if (err) + return err; + + err = import_ubuf(ITER_SOURCE, (void __user *)&rreq->in_out_arg, + 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_ring_req __user *rreq = ent->rreq; + struct fuse_copy_state cs; + struct fuse_args *args = req->args; + int err, res; + struct iov_iter iter; + + err = import_ubuf(ITER_DEST, (void __user *)&rreq->in_out_arg, + ent->max_arg_len, &iter); + if (err) { + pr_info("Import user buffer failed\n"); + return err; + } + + fuse_copy_init(&cs, 1, &iter); + cs.is_uring = 1; + cs.req = req; + err = fuse_copy_args(&cs, args->in_numargs, args->in_pages, + (struct fuse_arg *)args->in_args, 0); + if (err) { + pr_info("%s fuse_copy_args failed\n", __func__); + return err; + } + + BUILD_BUG_ON((sizeof(rreq->in_out_arg_len) != sizeof(cs.ring.offset))); + res = copy_to_user(&rreq->in_out_arg_len, &cs.ring.offset, + sizeof(rreq->in_out_arg_len)); + err = res > 0 ? -EFAULT : res; + + return err; +} + +static int +fuse_uring_prepare_send(struct fuse_ring_ent *ring_ent) +{ + struct fuse_ring_req *rreq = ring_ent->rreq; + 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 buf_req=%p invalid state %d on send\n", + queue->qid, ring_ent, rreq, 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(&rreq->in, &req->in.h, sizeof(rreq->in)); + 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. */ @@ -157,6 +393,197 @@ 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_ring_req *rreq = ring_ent->rreq; + struct fuse_req *req = ring_ent->fuse_req; + ssize_t err = 0; + bool set_err = false; + + err = copy_from_user(&req->out.h, &rreq->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; + continue; + } + + err = 0; + } 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; + unsigned int hash; + 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. + */ + hash = fuse_req_hash(commit_id); + 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; + } + ring_ent = req->ring_entry; + req->ring_entry = NULL; + + err = fuse_ring_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 */ @@ -281,6 +708,9 @@ int fuse_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags) case FUSE_URING_REQ_FETCH: err = fuse_uring_fetch(cmd, issue_flags, fc); break; + case FUSE_URING_REQ_COMMIT_AND_FETCH: + ret = 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 9a763262c6a5a781a36c3825529d729efef80e78..9bc7f490b02acb46aa7bbb31d5ce55a4d2787a60 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, }; @@ -43,6 +46,8 @@ struct fuse_ring_ent { /* struct fuse_ring_req::in_out_arg size*/ size_t max_arg_len; + + struct fuse_req *fuse_req; }; struct fuse_ring_queue { @@ -69,6 +74,14 @@ 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 33e81b895fee620b9c2fcc8d9312fec53e3dc227..f1ddaba92869518db8854512ec8dd5ed0a0eeaa7 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; @@ -1200,6 +1204,11 @@ 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; -- 2.43.0