From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B12D8C4332F for ; Tue, 19 Oct 2021 00:03:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 954E161351 for ; Tue, 19 Oct 2021 00:03:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234014AbhJSAFU (ORCPT ); Mon, 18 Oct 2021 20:05:20 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:40920 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229710AbhJSAFT (ORCPT ); Mon, 18 Oct 2021 20:05:19 -0400 Received: from localhost (unknown [IPv6:2804:14c:124:8a08::1007]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: krisman) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 57C9B1F411B7; Tue, 19 Oct 2021 01:03:06 +0100 (BST) From: Gabriel Krisman Bertazi To: jack@suse.com, amir73il@gmail.com Cc: djwong@kernel.org, tytso@mit.edu, david@fromorbit.com, dhowells@redhat.com, khazhy@google.com, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-api@vger.kernel.org, Gabriel Krisman Bertazi , kernel@collabora.com Subject: [PATCH v8 20/32] fanotify: Dynamically resize the FAN_FS_ERROR pool Date: Mon, 18 Oct 2021 21:00:03 -0300 Message-Id: <20211019000015.1666608-21-krisman@collabora.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211019000015.1666608-1-krisman@collabora.com> References: <20211019000015.1666608-1-krisman@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Allow the FAN_FS_ERROR group mempool to grow up to an upper limit dynamically, instead of starting already at the limit. This doesn't bother resizing on mark removal, but next time a mark is added, the slot will be either reused or resized. Also, if several marks are being removed at once, most likely the group is going away anyway. Signed-off-by: Gabriel Krisman Bertazi --- fs/notify/fanotify/fanotify_user.c | 26 +++++++++++++++++++++----- include/linux/fsnotify_backend.h | 1 + 2 files changed, 22 insertions(+), 5 deletions(-) diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index f77581c5b97f..a860c286e885 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -959,6 +959,10 @@ static int fanotify_remove_mark(struct fsnotify_group *group, removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags, umask, &destroy_mark); + + if (removed & FAN_FS_ERROR) + group->fanotify_data.error_event_marks--; + if (removed & fsnotify_conn_mask(fsn_mark->connector)) fsnotify_recalc_mask(fsn_mark->connector); if (destroy_mark) @@ -1057,12 +1061,24 @@ static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group, static int fanotify_group_init_error_pool(struct fsnotify_group *group) { - if (mempool_initialized(&group->fanotify_data.error_events_pool)) - return 0; + int ret; + + if (group->fanotify_data.error_event_marks >= + FANOTIFY_DEFAULT_MAX_FEE_POOL) + return -ENOMEM; - return mempool_init_kmalloc_pool(&group->fanotify_data.error_events_pool, - FANOTIFY_DEFAULT_MAX_FEE_POOL, - sizeof(struct fanotify_error_event)); + if (!mempool_initialized(&group->fanotify_data.error_events_pool)) + ret = mempool_init_kmalloc_pool( + &group->fanotify_data.error_events_pool, + 1, sizeof(struct fanotify_error_event)); + else + ret = mempool_resize(&group->fanotify_data.error_events_pool, + group->fanotify_data.error_event_marks + 1); + + if (!ret) + group->fanotify_data.error_event_marks++; + + return ret; } static int fanotify_add_mark(struct fsnotify_group *group, diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index 9941c06b8c8a..96e1d31394ce 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -247,6 +247,7 @@ struct fsnotify_group { int f_flags; /* event_f_flags from fanotify_init() */ struct ucounts *ucounts; mempool_t error_events_pool; + unsigned int error_event_marks; } fanotify_data; #endif /* CONFIG_FANOTIFY */ }; -- 2.33.0