From patchwork Tue Feb 13 21:57:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lokesh Gidra X-Patchwork-Id: 13555732 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (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 31D3E629FB for ; Tue, 13 Feb 2024 21:57:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707861477; cv=none; b=eREMmTWd6tUYmCi+/mIR3Gsyy9WCiqqdntrlzWuNKOoICciVNUFm5RP8/Q1o524mjDddrR3wCvNuwR1PfdeIhjjxlpTPhH+I+QkRqUU8CXUERA8G1bY3Wyk/PQe/JkFgcUdjA2w9en3lGNgbzCZIutCNO7vjJjvAYyZzos3tS3A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707861477; c=relaxed/simple; bh=z41+dvNtRXeKCs53H9ygm12hU6JxKhETApVU+NXe4U4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=OEb+gMohqsmpLklNe/M2wxWZkMBDKYJkskzcYhO1zOUXrK8xOru9Jb4RcJfGVq4ghoAWDCIgKICYQYDyYKk8N/M9DUvM0aq8FobmSEcCt5dNhKDT5KNoi3lKOpgNI/pFEDw1icPdQNdN738MAVWg8119n/+OCfMjVb9CHCc3ZCo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--lokeshgidra.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=nh3cUfB1; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--lokeshgidra.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="nh3cUfB1" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-5efe82b835fso109011827b3.0 for ; Tue, 13 Feb 2024 13:57:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1707861475; x=1708466275; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=FeTp34JzZtDcGzw26Xy4JuyVdUXeLDl6wgD9/498E4U=; b=nh3cUfB1Ln4GU+nYHusOfl2CI/raE/6IxRV2oZfUbNz9sPHFKb/yPT4r9YrUSFXbVZ K5g8gb7dZ4PejMDDxrZBNbYGaFkYAAF2kSOT1eLH9EY+ul/2HfzferF0/KiPFbOHIALo iJR03JFwDfGhgYZvwQRh1I/mAj3xOVxTJ37/PrhHeQDUnbJ+HkKRp+JFgWzCRSAgVEOr cipcqRAulXwyLNLkX9eVdQtOqZf8LPis8OlCt22FFyQcs8BWiX8CZlIVQM1BqOVO+fVO WDMoOD3PGyI0nEDSrFGGa49aFICpirpJG2GqjKtf1UniRwSVxQfe7Wjxbsltosc5tukc CP/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707861475; x=1708466275; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=FeTp34JzZtDcGzw26Xy4JuyVdUXeLDl6wgD9/498E4U=; b=O0rqjD1VUItWx1d8Yl8bKJnzq8Emop9kiAaBEgWjLwUrJINXXzJQDL8kW4Vvw9rmqK 1Fs7hB04+G4+cKItyPk5iXD4DOcQTVnvMALJqZL3MIkymb2lrv8HgVIQ23cDP0J4sxgt WfNEPJSzkddtlc25yOu5KwZ2CBtEKXxUtBfLaqBrVa0lrESiU1puf1R28MQJ1/aQ1JJK weSdJ0IEbcDhH/s7eEiLoAxv7lZ5RINz/NFYoTtOWstBp2MiT16iwjOrvHA7ES7LUrut GNW1roJfSTKN28fDgp/XVmdYPSCVcry6GTgsuQIPQDnPPF80KaW4R+oszn3uLe7lMcg+ qmJQ== X-Forwarded-Encrypted: i=1; AJvYcCWp/GCS1yNZJ8IjeS0SEdnFVjJWpLsLACxXep7XhCeKZrUGPvFh7EJSf9wPbKUdwrqvebwwQmr4D7mAbo4dNd8jt7V6w9R+YrApnUP9iQ== X-Gm-Message-State: AOJu0Yz+5FehmvTBi083ZLInA+7F1/DT9U4SL5xEsy9p3+JZbpS6Tyni 4Lnk0IyUcbPn9lAoXSr9sKViSCGmqjPTDh/XIGyFkPFrBgePsWlfamyRMtSetz+CUjL4LI9sHSR I6MWx3B2+BO+isbpFr5G2/Q== X-Google-Smtp-Source: AGHT+IF6FRAl67GGzZTs+uSDLQ3zEXnXXJGoppNG6Drbo0W+NjY2DiKJAS+tQbv/WS3Q7Q/R1NWID6lqQwyYNbHC0w== X-Received: from lg.mtv.corp.google.com ([2620:15c:211:202:ce6c:821f:a756:b4b8]) (user=lokeshgidra job=sendgmr) by 2002:a05:6902:1021:b0:dc6:fa35:b42 with SMTP id x1-20020a056902102100b00dc6fa350b42mr95095ybt.2.1707861475235; Tue, 13 Feb 2024 13:57:55 -0800 (PST) Date: Tue, 13 Feb 2024 13:57:39 -0800 In-Reply-To: <20240213215741.3816570-1-lokeshgidra@google.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240213215741.3816570-1-lokeshgidra@google.com> X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog Message-ID: <20240213215741.3816570-2-lokeshgidra@google.com> Subject: [PATCH v6 1/3] userfaultfd: move userfaultfd_ctx struct to header file From: Lokesh Gidra To: akpm@linux-foundation.org Cc: lokeshgidra@google.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, selinux@vger.kernel.org, surenb@google.com, kernel-team@android.com, aarcange@redhat.com, peterx@redhat.com, david@redhat.com, axelrasmussen@google.com, bgeffon@google.com, willy@infradead.org, jannh@google.com, kaleshsingh@google.com, ngeoffray@google.com, timmurray@google.com, rppt@kernel.org, Liam.Howlett@oracle.com Moving the struct to userfaultfd_k.h to be accessible from mm/userfaultfd.c. There are no other changes in the struct. This is required to prepare for using per-vma locks in userfaultfd operations. Signed-off-by: Lokesh Gidra Reviewed-by: Mike Rapoport (IBM) --- fs/userfaultfd.c | 39 ----------------------------------- include/linux/userfaultfd_k.h | 39 +++++++++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+), 39 deletions(-) diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 05c8e8a05427..58331b83d648 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -50,45 +50,6 @@ static struct ctl_table vm_userfaultfd_table[] = { static struct kmem_cache *userfaultfd_ctx_cachep __ro_after_init; -/* - * Start with fault_pending_wqh and fault_wqh so they're more likely - * to be in the same cacheline. - * - * Locking order: - * fd_wqh.lock - * fault_pending_wqh.lock - * fault_wqh.lock - * event_wqh.lock - * - * To avoid deadlocks, IRQs must be disabled when taking any of the above locks, - * since fd_wqh.lock is taken by aio_poll() while it's holding a lock that's - * also taken in IRQ context. - */ -struct userfaultfd_ctx { - /* waitqueue head for the pending (i.e. not read) userfaults */ - wait_queue_head_t fault_pending_wqh; - /* waitqueue head for the userfaults */ - wait_queue_head_t fault_wqh; - /* waitqueue head for the pseudo fd to wakeup poll/read */ - wait_queue_head_t fd_wqh; - /* waitqueue head for events */ - wait_queue_head_t event_wqh; - /* a refile sequence protected by fault_pending_wqh lock */ - seqcount_spinlock_t refile_seq; - /* pseudo fd refcounting */ - refcount_t refcount; - /* userfaultfd syscall flags */ - unsigned int flags; - /* features requested from the userspace */ - unsigned int features; - /* released */ - bool released; - /* memory mappings are changing because of non-cooperative event */ - atomic_t mmap_changing; - /* mm with one ore more vmas attached to this userfaultfd_ctx */ - struct mm_struct *mm; -}; - struct userfaultfd_fork_ctx { struct userfaultfd_ctx *orig; struct userfaultfd_ctx *new; diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h index e4056547fbe6..691d928ee864 100644 --- a/include/linux/userfaultfd_k.h +++ b/include/linux/userfaultfd_k.h @@ -36,6 +36,45 @@ #define UFFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK) #define UFFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS) +/* + * Start with fault_pending_wqh and fault_wqh so they're more likely + * to be in the same cacheline. + * + * Locking order: + * fd_wqh.lock + * fault_pending_wqh.lock + * fault_wqh.lock + * event_wqh.lock + * + * To avoid deadlocks, IRQs must be disabled when taking any of the above locks, + * since fd_wqh.lock is taken by aio_poll() while it's holding a lock that's + * also taken in IRQ context. + */ +struct userfaultfd_ctx { + /* waitqueue head for the pending (i.e. not read) userfaults */ + wait_queue_head_t fault_pending_wqh; + /* waitqueue head for the userfaults */ + wait_queue_head_t fault_wqh; + /* waitqueue head for the pseudo fd to wakeup poll/read */ + wait_queue_head_t fd_wqh; + /* waitqueue head for events */ + wait_queue_head_t event_wqh; + /* a refile sequence protected by fault_pending_wqh lock */ + seqcount_spinlock_t refile_seq; + /* pseudo fd refcounting */ + refcount_t refcount; + /* userfaultfd syscall flags */ + unsigned int flags; + /* features requested from the userspace */ + unsigned int features; + /* released */ + bool released; + /* memory mappings are changing because of non-cooperative event */ + atomic_t mmap_changing; + /* mm with one ore more vmas attached to this userfaultfd_ctx */ + struct mm_struct *mm; +}; + extern vm_fault_t handle_userfault(struct vm_fault *vmf, unsigned long reason); /* A combined operation mode + behavior flags. */