From patchwork Wed Sep 4 20:27:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josef Bacik X-Patchwork-Id: 13791343 Received: from mail-qk1-f170.google.com (mail-qk1-f170.google.com [209.85.222.170]) (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 DAA741714C1 for ; Wed, 4 Sep 2024 20:29:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.222.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725481770; cv=none; b=dFpSJvwPWv1mmre2nRH7eA3rnsxulM/XeD9qyK2oWce/dQCjQ831deeh82hLyxKOAxxTRW5uDMGmGm2z4Aoe91Rs9oyRXneESinGB8Lwe6qxZFNAeo16QTK3X8Fw/4l7lvP7iEtOZbhzczu2tU1eY3NzK7zVOKH50twpbP63GWw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725481770; c=relaxed/simple; bh=UkBoQACwZWNS66VUS7nQ/E+uy/3pz3xN2YqDEBSBDyw=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=A3vlJokbaIttDeFnQqlLZ9phAnPXSAqt1N24knSLIpf/jaTWwKkoNRVV5bhnYc4K85EWC0+w8m3WX0cqsW2SHk/soAoagc78ifrT+3YPXRnzzdKBbcErZXXi2TyQsTDk6o0c/XiJsHdf5TM6mrSINvq7vo6lTM8qpVLdpxy+kVU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=toxicpanda.com; spf=none smtp.mailfrom=toxicpanda.com; dkim=pass (2048-bit key) header.d=toxicpanda-com.20230601.gappssmtp.com header.i=@toxicpanda-com.20230601.gappssmtp.com header.b=mdhpT0tG; arc=none smtp.client-ip=209.85.222.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=toxicpanda.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=toxicpanda.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=toxicpanda-com.20230601.gappssmtp.com header.i=@toxicpanda-com.20230601.gappssmtp.com header.b="mdhpT0tG" Received: by mail-qk1-f170.google.com with SMTP id af79cd13be357-7a8049d4a4cso2839285a.0 for ; Wed, 04 Sep 2024 13:29:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=toxicpanda-com.20230601.gappssmtp.com; s=20230601; t=1725481768; x=1726086568; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=kdFADlNMi9J5+Jo97YgtLX17z0QeGZLAaqk7oAQuL90=; b=mdhpT0tGPDmH7J6XLzDodwE6DGwnaSrY0JW+v7D6TVPxyccLmEFXz/cxq37IdLQLEA AyvZO0deX815OA++zxzdqC3KDTmSV4gsUjiWE/K86wYLFRMbr01w5UeH0t5SNp4Vg2/4 meaw6/HNo724mJzJJU8iEPvnRNHHCzcaCkRq5/Embp/YyByUk9iAWru1YDscrfby7MvS 2+ycnd7/xJX5nlQfWsFq+yaErpj15Z6lqpQVU5kS/kJ6/xleoqmr9hHnI5UAh/wK7Ykp 04xmVLXCqSmr+phqe+tAsVECuQi/eiWgZLcIqEPdmgPRXqy7gA1wiA6sFQHggyU+SxII 3iRg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725481768; x=1726086568; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=kdFADlNMi9J5+Jo97YgtLX17z0QeGZLAaqk7oAQuL90=; b=Fa05nRKa1266I1LuF+IbKMCBnKeqwxNHfDWBoV9keiSi5BxVgov/sHSxG/HB2h+oDD mjUwv4lMKElcJ7VC002MpEqHBdBT03wzU8MXcRgqySgGwLBTI+S/rxT6jpsvN1zYR8mI KH7l3ejPymkN8jZFs+zO/93hv+XsEjwlTJ+tzmXmcH+DRKjz/KBle95CLDIsH9Ec/OGB IbkYMANe9DBM0E7n2rEPoXLBvhqg4tFpO6PkgEwmr2wicMmqyyRG//3UgjWWJhan51nF QQagbMv0KBtqiCASQuH+ayjV7D60ytapKvKkKLfWefZOuvcxkkuDtijGsLZ4DTM0ODTw ZPeg== X-Forwarded-Encrypted: i=1; AJvYcCVUo6UlEZJe0avBOml7DzU1Xam1lRUudZ2kGNOQqOOm2QILlXH/woREewQHAGkTTdVD2pFpje8FVD6NuePs@vger.kernel.org X-Gm-Message-State: AOJu0Yyo3l38UQr+P3T5sPjhs6q/H1jX7l+1jMVkuJdpZ0FmuN9FMKsI dSL0h8H/mxgSHqYza+ljstjZoGo7pORT8MRPzXobYod5sbPSw4D+knVwM7fXiaE= X-Google-Smtp-Source: AGHT+IGx6um9uXhEhda5h73KKWCoNW2FF/dwyP15+JSEZ33BwCH3HCg2dZ3AYVIuYxLr9QIEDkXCMg== X-Received: by 2002:a05:620a:1724:b0:79e:fc9c:4bcb with SMTP id af79cd13be357-7a8931ddae4mr1887788985a.11.1725481767911; Wed, 04 Sep 2024 13:29:27 -0700 (PDT) Received: from localhost (syn-076-182-020-124.res.spectrum.com. [76.182.20.124]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7a98ef4a2ebsm15638785a.67.2024.09.04.13.29.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Sep 2024 13:29:27 -0700 (PDT) From: Josef Bacik To: kernel-team@fb.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, amir73il@gmail.com, brauner@kernel.org, linux-xfs@vger.kernel.org, linux-bcachefs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v5 08/18] fanotify: report file range info with pre-content events Date: Wed, 4 Sep 2024 16:27:58 -0400 Message-ID: <0833eaada39f0a33e655b47f2d15a5a37cf39a78.1725481503.git.josef@toxicpanda.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Amir Goldstein With group class FAN_CLASS_PRE_CONTENT, report offset and length info along with FAN_PRE_ACCESS and FAN_PRE_MODIFY permission events. This information is meant to be used by hierarchical storage managers that want to fill partial content of files on first access to range. Signed-off-by: Amir Goldstein --- fs/notify/fanotify/fanotify.h | 8 +++++++ fs/notify/fanotify/fanotify_user.c | 38 ++++++++++++++++++++++++++++++ include/uapi/linux/fanotify.h | 8 +++++++ 3 files changed, 54 insertions(+) diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h index 93598b7d5952..7f06355afa1f 100644 --- a/fs/notify/fanotify/fanotify.h +++ b/fs/notify/fanotify/fanotify.h @@ -448,6 +448,14 @@ static inline bool fanotify_is_perm_event(u32 mask) mask & FANOTIFY_PERM_EVENTS; } +static inline bool fanotify_event_has_access_range(struct fanotify_event *event) +{ + if (!(event->mask & FANOTIFY_PRE_CONTENT_EVENTS)) + return false; + + return FANOTIFY_PERM(event)->ppos; +} + static inline struct fanotify_event *FANOTIFY_E(struct fsnotify_event *fse) { return container_of(fse, struct fanotify_event, fse); diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index 5ece186d5c50..ed56fe6f5ec7 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -123,6 +123,8 @@ struct kmem_cache *fanotify_perm_event_cachep __ro_after_init; sizeof(struct fanotify_event_info_pidfd) #define FANOTIFY_ERROR_INFO_LEN \ (sizeof(struct fanotify_event_info_error)) +#define FANOTIFY_RANGE_INFO_LEN \ + (sizeof(struct fanotify_event_info_range)) static int fanotify_fid_info_len(int fh_len, int name_len) { @@ -182,6 +184,9 @@ static size_t fanotify_event_len(unsigned int info_mode, if (info_mode & FAN_REPORT_PIDFD) event_len += FANOTIFY_PIDFD_INFO_LEN; + if (fanotify_event_has_access_range(event)) + event_len += FANOTIFY_RANGE_INFO_LEN; + return event_len; } @@ -526,6 +531,30 @@ static int copy_pidfd_info_to_user(int pidfd, return info_len; } +static size_t copy_range_info_to_user(struct fanotify_event *event, + char __user *buf, int count) +{ + struct fanotify_perm_event *pevent = FANOTIFY_PERM(event); + struct fanotify_event_info_range info = { }; + size_t info_len = FANOTIFY_RANGE_INFO_LEN; + + if (WARN_ON_ONCE(info_len > count)) + return -EFAULT; + + if (WARN_ON_ONCE(!pevent->ppos)) + return -EINVAL; + + info.hdr.info_type = FAN_EVENT_INFO_TYPE_RANGE; + info.hdr.len = info_len; + info.offset = *(pevent->ppos); + info.count = pevent->count; + + if (copy_to_user(buf, &info, info_len)) + return -EFAULT; + + return info_len; +} + static int copy_info_records_to_user(struct fanotify_event *event, struct fanotify_info *info, unsigned int info_mode, int pidfd, @@ -647,6 +676,15 @@ static int copy_info_records_to_user(struct fanotify_event *event, total_bytes += ret; } + if (fanotify_event_has_access_range(event)) { + ret = copy_range_info_to_user(event, buf, count); + if (ret < 0) + return ret; + buf += ret; + count -= ret; + total_bytes += ret; + } + return total_bytes; } diff --git a/include/uapi/linux/fanotify.h b/include/uapi/linux/fanotify.h index ac00fad66416..6136e8a9f9f3 100644 --- a/include/uapi/linux/fanotify.h +++ b/include/uapi/linux/fanotify.h @@ -145,6 +145,7 @@ struct fanotify_event_metadata { #define FAN_EVENT_INFO_TYPE_DFID 3 #define FAN_EVENT_INFO_TYPE_PIDFD 4 #define FAN_EVENT_INFO_TYPE_ERROR 5 +#define FAN_EVENT_INFO_TYPE_RANGE 6 /* Special info types for FAN_RENAME */ #define FAN_EVENT_INFO_TYPE_OLD_DFID_NAME 10 @@ -191,6 +192,13 @@ struct fanotify_event_info_error { __u32 error_count; }; +struct fanotify_event_info_range { + struct fanotify_event_info_header hdr; + __u32 pad; + __u64 offset; + __u64 count; +}; + /* * User space may need to record additional information about its decision. * The extra information type records what kind of information is included.