linux-kernel - [PATCH 3/6] super: skip dying superblocks early

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Message-ID: <20250328-work-freeze-v1-3-a2c3a6b0e7a6@kernel.org>
Date: Fri, 28 Mar 2025 17:15:55 +0100
From: Christian Brauner <brauner@...nel.org>
To: linux-fsdevel@...r.kernel.org,
	jack@...e.cz
Cc: Christian Brauner <brauner@...nel.org>,
	linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	mcgrof@...nel.org,
	hch@...radead.org,
	david@...morbit.com,
	rafael@...nel.org,
	djwong@...nel.org,
	pavel@...nel.org,
	peterz@...radead.org,
	mingo@...hat.com,
	will@...nel.org,
	boqun.feng@...il.com
Subject: [PATCH 3/6] super: skip dying superblocks early

Make all iterators uniform by performing an early check whether the
superblock is dying.

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 fs/super.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/super.c b/fs/super.c
index b1acfc38ba0c..c67ea3cdda41 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -925,6 +925,9 @@ void iterate_supers(void (*f)(struct super_block *, void *), void *arg)
 	list_for_each_entry(sb, &super_blocks, s_list) {
 		bool locked;
 
+		if (super_flags(sb, SB_DYING))
+			continue;
+
 		sb->s_count++;
 		spin_unlock(&sb_lock);
 
@@ -962,6 +965,9 @@ void iterate_supers_type(struct file_system_type *type,
 	hlist_for_each_entry(sb, &type->fs_supers, s_instances) {
 		bool locked;
 
+		if (super_flags(sb, SB_DYING))
+			continue;
+
 		sb->s_count++;
 		spin_unlock(&sb_lock);
 

-- 
2.47.2