From patchwork Thu Jul 11 07:48:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Youling Tang X-Patchwork-Id: 13730129 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 lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 103B5C3DA41 for ; Thu, 11 Jul 2024 07:50:01 +0000 (UTC) Received: from [127.0.0.1] (helo=sfs-ml-1.v29.lw.sourceforge.com) by sfs-ml-1.v29.lw.sourceforge.com with esmtp (Exim 4.95) (envelope-from ) id 1sRoYx-0008VX-6t; Thu, 11 Jul 2024 07:50:00 +0000 Received: from [172.30.29.66] (helo=mx.sourceforge.net) by sfs-ml-1.v29.lw.sourceforge.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1sRoYv-0008VM-OW for linux-f2fs-devel@lists.sourceforge.net; Thu, 11 Jul 2024 07:49:58 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=XFljGRgWS+o+/FKeNHoSuAwsaBjm894r1O3P7vtGZus=; b=jPwt338jhoNVq4zljgX9nqM68j OEAj5csrliSRagSVwo+zjKmZnFLHYNBS3MN5kM8EzrF6xJ5uJw1fH4cREAsglMCw/n6EjTudkDRpC r0Fhr3GG7YgGIed+haR8rV6fI7z7BVcHZol7ZbApQQxPdDXjp8Lp0vYVQCE5nYrxUpxk=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=XFljGRgWS+o+/FKeNHoSuAwsaBjm894r1O3P7vtGZus=; b=j8eNnQYHSBpYYbKNST/5rWnopw 1JMyCgK3hH3uvyEro13V6ZGv1oEwFALT+kuQS9odSN74Mb/a2XvaTAg4rQ1l/NRBUtnLpwqdp9ldL 4EpgYDN355cClxIFsKJY2+dqJQuUUCQJ++2npVAB+ACwft4Eg2KJUrDa5XrJiWzIK66o=; Received: from out-171.mta1.migadu.com ([95.215.58.171]) by sfi-mx-2.v28.lw.sourceforge.com with esmtps (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.95) id 1sRoYs-0008VS-NX for linux-f2fs-devel@lists.sourceforge.net; Thu, 11 Jul 2024 07:49:55 +0000 X-Envelope-To: viro@zeniv.linux.org.uk DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1720684182; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XFljGRgWS+o+/FKeNHoSuAwsaBjm894r1O3P7vtGZus=; b=jSvwbqw3JyuWV/rQ+ZE2imPoy05s3NrdV5LAgLTjuyX+UDtp/EV2WTfYpEP+Emd5kSmXF7 7gAa6C0nAliSpduOxjQsD12PSVsToOrc5CnXNaemS/16UIWhsZIz0T2CwNZuE4mbd8j9XI HtdV9C6O9Qu2SOKnoEJC1WSdobq3lP0= X-Envelope-To: brauner@kernel.org X-Envelope-To: jack@suse.cz X-Envelope-To: clm@fb.com X-Envelope-To: josef@toxicpanda.com X-Envelope-To: dsterba@suse.com X-Envelope-To: tytso@mit.edu X-Envelope-To: adilger.kernel@dilger.ca X-Envelope-To: jaegeuk@kernel.org X-Envelope-To: chao@kernel.org X-Envelope-To: linux-fsdevel@vger.kernel.org X-Envelope-To: linux-btrfs@vger.kernel.org X-Envelope-To: linux-ext4@vger.kernel.org X-Envelope-To: linux-f2fs-devel@lists.sourceforge.net X-Envelope-To: linux-kernel@vger.kernel.org X-Envelope-To: youling.tang@linux.dev X-Envelope-To: tangyouling@kylinos.cn X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Youling Tang To: Alexander Viro , Christian Brauner , Jan Kara , Chris Mason , Josef Bacik , David Sterba , tytso@mit.edu, Andreas Dilger , Jaegeuk Kim , Chao Yu Date: Thu, 11 Jul 2024 15:48:58 +0800 Message-Id: <20240711074859.366088-3-youling.tang@linux.dev> In-Reply-To: <20240711074859.366088-1-youling.tang@linux.dev> References: <20240711074859.366088-1-youling.tang@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Headers-End: 1sRoYs-0008VS-NX Subject: [f2fs-dev] [PATCH 2/3] ext4: make ext4 init/exit match their sequence X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Youling Tang , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, youling.tang@linux.dev, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Youling Tang Use init_sequence to ensure that modules init and exit are in sequence and to simplify the code. Signed-off-by: Youling Tang --- fs/ext4/super.c | 175 +++++++++++++++++++++++++----------------------- 1 file changed, 93 insertions(+), 82 deletions(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index c682fb927b64..ec1e63facb10 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -7314,103 +7314,114 @@ static struct file_system_type ext4_fs_type = { }; MODULE_ALIAS_FS("ext4"); -/* Shared across all ext4 file systems */ -wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; - -static int __init ext4_init_fs(void) +static int register_ext(void) { - int i, err; - - ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64); - ext4_li_info = NULL; + register_as_ext3(); + register_as_ext2(); + return register_filesystem(&ext4_fs_type); +} - /* Build-time check for flags consistency */ - ext4_check_flag_values(); +static void unregister_ext(void) +{ + unregister_as_ext2(); + unregister_as_ext3(); + unregister_filesystem(&ext4_fs_type); +} - for (i = 0; i < EXT4_WQ_HASH_SZ; i++) - init_waitqueue_head(&ext4__ioend_wq[i]); +/* Helper structure for long init/exit functions. */ +struct init_sequence { + int (*init_func)(void); + /* Can be NULL if the init_func doesn't need cleanup. */ + void (*exit_func)(void); +}; - err = ext4_init_es(); - if (err) - return err; +static const struct init_sequence mod_init_seq[] = { + { + .init_func = ext4_init_es, + .exit_func = ext4_exit_es, + }, { + .init_func = ext4_init_pending, + .exit_func = ext4_exit_pending, + }, { + .init_func = ext4_init_post_read_processing, + .exit_func = ext4_exit_post_read_processing, + }, { + .init_func = ext4_init_pageio, + .exit_func = ext4_exit_pageio, + }, { + .init_func = ext4_init_system_zone, + .exit_func = ext4_exit_system_zone, + }, { + .init_func = ext4_init_sysfs, + .exit_func = ext4_exit_sysfs, + }, { + .init_func = ext4_init_mballoc, + .exit_func = ext4_exit_mballoc, + }, { + .init_func = init_inodecache, + .exit_func = destroy_inodecache, + }, { + .init_func = ext4_fc_init_dentry_cache, + .exit_func = ext4_fc_destroy_dentry_cache, + }, { + .init_func = register_ext, + .exit_func = unregister_ext, + } +}; - err = ext4_init_pending(); - if (err) - goto out7; +static bool mod_init_result[ARRAY_SIZE(mod_init_seq)]; - err = ext4_init_post_read_processing(); - if (err) - goto out6; +static __always_inline void ext4_exit_ext4_fs(void) +{ + int i; - err = ext4_init_pageio(); - if (err) - goto out5; + for (i = ARRAY_SIZE(mod_init_seq) - 1; i >= 0; i--) { + if (!mod_init_result[i]) + continue; + if (mod_init_seq[i].exit_func) + mod_init_seq[i].exit_func(); + mod_init_result[i] = false; + } +} - err = ext4_init_system_zone(); - if (err) - goto out4; +static void __exit ext4_exit_fs(void) +{ + ext4_destroy_lazyinit_thread(); + ext4_exit_ext4_fs(); +} - err = ext4_init_sysfs(); - if (err) - goto out3; +static __always_inline int ext4_init_ext4_fs(void) +{ + int ret; + int i; - err = ext4_init_mballoc(); - if (err) - goto out2; - err = init_inodecache(); - if (err) - goto out1; + for (i = 0; i < ARRAY_SIZE(mod_init_seq); i++) { + ASSERT(!mod_init_result[i]); + ret = mod_init_seq[i].init_func(); + if (ret < 0) { + ext4_exit_ext4_fs(); + return ret; + } + mod_init_result[i] = true; + } + return 0; +} - err = ext4_fc_init_dentry_cache(); - if (err) - goto out05; +/* Shared across all ext4 file systems */ +wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; - register_as_ext3(); - register_as_ext2(); - err = register_filesystem(&ext4_fs_type); - if (err) - goto out; +static int __init ext4_init_fs(void) +{ + ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64); + ext4_li_info = NULL; - return 0; -out: - unregister_as_ext2(); - unregister_as_ext3(); - ext4_fc_destroy_dentry_cache(); -out05: - destroy_inodecache(); -out1: - ext4_exit_mballoc(); -out2: - ext4_exit_sysfs(); -out3: - ext4_exit_system_zone(); -out4: - ext4_exit_pageio(); -out5: - ext4_exit_post_read_processing(); -out6: - ext4_exit_pending(); -out7: - ext4_exit_es(); + /* Build-time check for flags consistency */ + ext4_check_flag_values(); - return err; -} + for (int i = 0; i < EXT4_WQ_HASH_SZ; i++) + init_waitqueue_head(&ext4__ioend_wq[i]); -static void __exit ext4_exit_fs(void) -{ - ext4_destroy_lazyinit_thread(); - unregister_as_ext2(); - unregister_as_ext3(); - unregister_filesystem(&ext4_fs_type); - ext4_fc_destroy_dentry_cache(); - destroy_inodecache(); - ext4_exit_mballoc(); - ext4_exit_sysfs(); - ext4_exit_system_zone(); - ext4_exit_pageio(); - ext4_exit_post_read_processing(); - ext4_exit_es(); - ext4_exit_pending(); + return ext4_init_ext4_fs(); } MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");