From patchwork Tue Feb 6 01:09:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lokesh Gidra X-Patchwork-Id: 13546493 Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) (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 C7E1C4A02 for ; Tue, 6 Feb 2024 01:09:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707181789; cv=none; b=a7k1LNUw3faiqRGSGdw8mA7YbBOxf3ngPqmc2GBXxrj63hZNkvHyVlGqnxz89fqdMboQa6dAjlvnyh8ACEOv9jQScFqr1caq4lay1T8sWaLtteAnZEzbNKFSeju4BYE22QgbXtcmiHKEVDmlkk/zyMkpZ7Q3f+mkBTed/WFhN5k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707181789; c=relaxed/simple; bh=bW5FqUi/xixapZsn2hg3bnkQMMB9OGn3jW6cVE5NBpw=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=P3/MDbtah/n/WAhXoZMV4VsIR6wdcGwXHcvXq64tsYqq3wWjVdtlGNBR4WYJSWcsjUo6uWY5ZWW/wOzsh1nhUgJMdSTxVXf8SDmiG+dnS6kRMWGwnMP05tkXv27yaCvuRm/lcQf23fD3grOh6jiMhPDRgfy9qgg+mXwNzxnaqPY= 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=IkJeKvR6; arc=none smtp.client-ip=209.85.219.201 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="IkJeKvR6" Received: by mail-yb1-f201.google.com with SMTP id 3f1490d57ef6-dc693399655so8096928276.1 for ; Mon, 05 Feb 2024 17:09:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1707181787; x=1707786587; 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=l0Wsa/otXfcNbNeX5OxfMRaNnAPGn+xliclZzLODRNs=; b=IkJeKvR6Iclv0F+scZfsBuvRqyDqE7LSd1FwFesYxaZLtceS+MwKQTBgbVler14khK xvdjNJ7wWY0wa8umpb2erSiE4BB3hH+VPMuqbP1pW/0GPTRUWCp27R0iFio4HlZT+x98 YIQetP6lbogEreqEZSGdSulXWUiK7xU6F38xQGn87dds+edeeRisB2QK8XSUBmp8isDD Wf5bZytpzM4e80MQnk55AQRRRwApV2ZtsTpOKxjfhJwruatI6//zN4v0tkVGaDzfD8wG DI2ZvYXKbDENTQa0bN2fQ+BY1dcNMECQd85AYTikexsFS0vJvhblABu+aPAuqu4UpGWs M0Wg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707181787; x=1707786587; 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=l0Wsa/otXfcNbNeX5OxfMRaNnAPGn+xliclZzLODRNs=; b=HC1JWzF1pDlQQifMg8ACj/6ZEMouW/B4UUwbhB4sdrfGkOfAumELE0x7oPzbnn0Y5C cChGyBANN36qle04Cud4hhzPUTsVYTQPghreK7+MilzzD190ugUtyXT8fQMbnkBFVo/5 iQ2iumx6JhYUnC4pLhPUQIBS/JuEoI5CMLu+TnVkfMN16B7ql2/LIvDr3G4DYdHedtBN HtaB/oB1j6vucvK8cbYxrTXG23dieulZUmYoKyb/8teC6+DG5kvwkv5RmRHBfX46H5rO znWDSlimld7vKNqkZfh4IXb6tUqMujhlAipdDNy8NpBOUH41QQNQZAcBvohfLH/YcAwT oMeg== X-Gm-Message-State: AOJu0YxpTLH1uVmIKvAQ0OQGKnJW06cr/CBUGXXtWUqFZf0Za+vAiClg +IQLrhnYF79yT2DAKlmgIHNL23BfDs9pnbFSU8+oCYNEa5aSa3fN7EgsMyNVfpcld7rnc0/GoAM OpyW4tOfq3Rh1dF1Zqv4UHw== X-Google-Smtp-Source: AGHT+IENlNSDcojoxWkSl049zlYz4bm/u4F+E9+JQ3HrIX9YrhW8LmpdpxXCyJfTB1mNb9KyDkiJPwezJtg2W5ykyQ== X-Received: from lg.mtv.corp.google.com ([2620:15c:211:202:713:bb2c:e0e8:becb]) (user=lokeshgidra job=sendgmr) by 2002:a05:6902:13ce:b0:dc6:e90a:7f2a with SMTP id y14-20020a05690213ce00b00dc6e90a7f2amr53474ybu.5.1707181786937; Mon, 05 Feb 2024 17:09:46 -0800 (PST) Date: Mon, 5 Feb 2024 17:09:17 -0800 In-Reply-To: <20240206010919.1109005-1-lokeshgidra@google.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240206010919.1109005-1-lokeshgidra@google.com> X-Mailer: git-send-email 2.43.0.594.gd9cf4e227d-goog Message-ID: <20240206010919.1109005-2-lokeshgidra@google.com> Subject: [PATCH v3 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. */