From patchwork Thu Nov 26 13:03:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 1406614 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.infradead.org (client-ip=2001:8b0:10b:1231::1; helo=merlin.infradead.org; envelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; secure) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=merlin.20170209 header.b=jbaftc2r; dkim=fail reason="signature verification failed" (2048-bit key; secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=casper.20170209 header.b=T24et5TX; dkim-atps=neutral Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4ChdNv1Ytjz9sWg for ; Fri, 27 Nov 2020 00:08:31 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ECRdJMxKufX5G5lfQoZ/yuFOIvT6j5nuVYHroQHDYDA=; b=jbaftc2r04PUkG5Cu7x5JCBHD UbxPD459QAR6mVRaksLC8v9nshaPk79Klo8Pl6GJ0Hl7jLdMtti5mRp8sIyWcvvs9XTFx1M2+8LnV YuHiFZBmJEOe4sftCYaLYF8FGP65e16qKIkiVfAYaOm9bfzFGIrf68q7UKPrfTJ1Q5le9ao3iJ21a IHoGTZD6h7Tu9aC5kh+/9hIGdN+GtnZYjPe4HuKncwC81lk1jHY4paV3e9mcPxwTpxxcTrF0qeh+J XqrqhLmNnaHxOzIu6GV83Fp3/lu4hBpGRC3+hR3Il2UioiDK2UhvDNp7Weivk/YycpF6ZnyXZ4pf6 H+l87v6Cg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGzN-00087U-7d; Thu, 26 Nov 2020 13:07:10 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyt-00080T-UE for linux-mtd@merlin.infradead.org; Thu, 26 Nov 2020 13:06:40 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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; bh=XnXdcQtajIOk6W1AjzTgGSRfD1WpR1y99lVXhBEiUaA=; b=T24et5TXruOuaLikxde8zjbFq2 alZbvSGO8obX2HcQfQIUHBwxKBu//tTldFMU7kivVnN2YXfNGaruEWmEYBXmafcW39quZNdieUmmW 8gapO5pqJQ+oYJLHTVo8kH6afQIN4CIwUEKigO6kJ4rwfPpsHyd0rtj2fDeQTWQjswJjDqv0djcI7 NLOHaBT3nYHtkp54MPBjj8GQJfByZy+kD81CknCcdEJOFbaGX70dZTWrLXn9s++hmkP5TW0f2H1aF pdej/bw1qMMXVOH/CpM5Fj/qt2Unj9fnskMzEmPNsgwLChtTSLyjjGwt8J7dOflqco0Y2YRaY3guW s52OEbrQ==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGys-0003wR-ME; Thu, 26 Nov 2020 13:06:39 +0000 From: Christoph Hellwig To: Jens Axboe Subject: [PATCH 03/44] fs: remove get_super_thawed and get_super_exclusive_thawed Date: Thu, 26 Nov 2020 14:03:41 +0100 Message-Id: <20201126130422.92945-4-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-bcache@vger.kernel.org, Jan Kara , Mike Snitzer , linux-mm@kvack.org, Greg Kroah-Hartman , Jan Kara , Josef Bacik , Coly Li , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, dm-devel@redhat.com, linux-mtd@lists.infradead.org, Hannes Reinecke , Johannes Thumshirn , Tejun Heo Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Just open code the wait in the only caller of both functions. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Reviewed-by: Hannes Reinecke --- fs/internal.h | 2 ++ fs/quota/quota.c | 31 +++++++++++++++++++++------- fs/super.c | 51 ++-------------------------------------------- include/linux/fs.h | 4 +--- 4 files changed, 29 insertions(+), 59 deletions(-) diff --git a/fs/internal.h b/fs/internal.h index a7cd0f64faa4ab..47be21dfeebef5 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -114,7 +114,9 @@ extern struct file *alloc_empty_file_noaccount(int, const struct cred *); */ extern int reconfigure_super(struct fs_context *); extern bool trylock_super(struct super_block *sb); +struct super_block *__get_super(struct block_device *bdev, bool excl); extern struct super_block *user_get_super(dev_t); +void put_super(struct super_block *sb); extern bool mount_capable(struct fs_context *); /* diff --git a/fs/quota/quota.c b/fs/quota/quota.c index 9af95c7a0bbe3c..f3d32b0d9008f2 100644 --- a/fs/quota/quota.c +++ b/fs/quota/quota.c @@ -20,6 +20,7 @@ #include #include #include "compat.h" +#include "../internal.h" static int check_quotactl_permission(struct super_block *sb, int type, int cmd, qid_t id) @@ -868,6 +869,7 @@ static struct super_block *quotactl_block(const char __user *special, int cmd) struct block_device *bdev; struct super_block *sb; struct filename *tmp = getname(special); + bool excl = false, thawed = false; if (IS_ERR(tmp)) return ERR_CAST(tmp); @@ -875,17 +877,32 @@ static struct super_block *quotactl_block(const char __user *special, int cmd) putname(tmp); if (IS_ERR(bdev)) return ERR_CAST(bdev); - if (quotactl_cmd_onoff(cmd)) - sb = get_super_exclusive_thawed(bdev); - else if (quotactl_cmd_write(cmd)) - sb = get_super_thawed(bdev); - else - sb = get_super(bdev); + + if (quotactl_cmd_onoff(cmd)) { + excl = true; + thawed = true; + } else if (quotactl_cmd_write(cmd)) { + thawed = true; + } + +retry: + sb = __get_super(bdev, excl); + if (thawed && sb && sb->s_writers.frozen != SB_UNFROZEN) { + if (excl) + up_write(&sb->s_umount); + else + up_read(&sb->s_umount); + wait_event(sb->s_writers.wait_unfrozen, + sb->s_writers.frozen == SB_UNFROZEN); + put_super(sb); + goto retry; + } + bdput(bdev); if (!sb) return ERR_PTR(-ENODEV); - return sb; + #else return ERR_PTR(-ENODEV); #endif diff --git a/fs/super.c b/fs/super.c index 98bb0629ee108e..343e5c1e538d2a 100644 --- a/fs/super.c +++ b/fs/super.c @@ -307,7 +307,7 @@ static void __put_super(struct super_block *s) * Drops a temporary reference, frees superblock if there's no * references left. */ -static void put_super(struct super_block *sb) +void put_super(struct super_block *sb) { spin_lock(&sb_lock); __put_super(sb); @@ -740,7 +740,7 @@ void iterate_supers_type(struct file_system_type *type, EXPORT_SYMBOL(iterate_supers_type); -static struct super_block *__get_super(struct block_device *bdev, bool excl) +struct super_block *__get_super(struct block_device *bdev, bool excl) { struct super_block *sb; @@ -789,53 +789,6 @@ struct super_block *get_super(struct block_device *bdev) } EXPORT_SYMBOL(get_super); -static struct super_block *__get_super_thawed(struct block_device *bdev, - bool excl) -{ - while (1) { - struct super_block *s = __get_super(bdev, excl); - if (!s || s->s_writers.frozen == SB_UNFROZEN) - return s; - if (!excl) - up_read(&s->s_umount); - else - up_write(&s->s_umount); - wait_event(s->s_writers.wait_unfrozen, - s->s_writers.frozen == SB_UNFROZEN); - put_super(s); - } -} - -/** - * get_super_thawed - get thawed superblock of a device - * @bdev: device to get the superblock for - * - * Scans the superblock list and finds the superblock of the file system - * mounted on the device. The superblock is returned once it is thawed - * (or immediately if it was not frozen). %NULL is returned if no match - * is found. - */ -struct super_block *get_super_thawed(struct block_device *bdev) -{ - return __get_super_thawed(bdev, false); -} -EXPORT_SYMBOL(get_super_thawed); - -/** - * get_super_exclusive_thawed - get thawed superblock of a device - * @bdev: device to get the superblock for - * - * Scans the superblock list and finds the superblock of the file system - * mounted on the device. The superblock is returned once it is thawed - * (or immediately if it was not frozen) and s_umount semaphore is held - * in exclusive mode. %NULL is returned if no match is found. - */ -struct super_block *get_super_exclusive_thawed(struct block_device *bdev) -{ - return __get_super_thawed(bdev, true); -} -EXPORT_SYMBOL(get_super_exclusive_thawed); - /** * get_active_super - get an active reference to the superblock of a device * @bdev: device to get the superblock for diff --git a/include/linux/fs.h b/include/linux/fs.h index 8667d0cdc71e76..a61df0dd4f1989 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1409,7 +1409,7 @@ enum { struct sb_writers { int frozen; /* Is sb frozen? */ - wait_queue_head_t wait_unfrozen; /* for get_super_thawed() */ + wait_queue_head_t wait_unfrozen; /* wait for thaw */ struct percpu_rw_semaphore rw_sem[SB_FREEZE_LEVELS]; }; @@ -3132,8 +3132,6 @@ extern struct file_system_type *get_filesystem(struct file_system_type *fs); extern void put_filesystem(struct file_system_type *fs); extern struct file_system_type *get_fs_type(const char *name); extern struct super_block *get_super(struct block_device *); -extern struct super_block *get_super_thawed(struct block_device *); -extern struct super_block *get_super_exclusive_thawed(struct block_device *bdev); extern struct super_block *get_active_super(struct block_device *bdev); extern void drop_super(struct super_block *sb); extern void drop_super_exclusive(struct super_block *sb);