linux-kernel - [PATCH 5.15 261/530] ext4: dont run ext4lazyinit for read-only filesystems

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Message-Id: <20221024113056.873876510@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:30:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Josh Triplett <josh@...htriplett.org>,
        Lukas Czerner <lczerner@...hat.com>,
        Theodore Tso <tytso@....edu>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 261/530] ext4: dont run ext4lazyinit for read-only filesystems

From: Josh Triplett <josh@...htriplett.org>

[ Upstream commit 426d15ad11419066f7042ffa8fbf1b5c21a1ecbe ]

On a read-only filesystem, we won't invoke the block allocator, so we
don't need to prefetch the block bitmaps.

This avoids starting and running the ext4lazyinit thread at all on a
system with no read-write ext4 filesystems (for instance, a container VM
with read-only filesystems underneath an overlayfs).

Fixes: 21175ca434c5 ("ext4: make prefetch_block_bitmaps default")
Signed-off-by: Josh Triplett <josh@...htriplett.org>
Reviewed-by: Lukas Czerner <lczerner@...hat.com>
Link: https://lore.kernel.org/r/48b41da1498fcac3287e2e06b660680646c1c050.1659323972.git.josh@joshtriplett.org
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ext4/super.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index eec41990fa65..985d79fb6128 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3587,9 +3587,9 @@ int ext4_register_li_request(struct super_block *sb,
 		goto out;
 	}
 
-	if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
-	    (first_not_zeroed == ngroups || sb_rdonly(sb) ||
-	     !test_opt(sb, INIT_INODE_TABLE)))
+	if (sb_rdonly(sb) ||
+	    (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
+	     (first_not_zeroed == ngroups || !test_opt(sb, INIT_INODE_TABLE))))
 		goto out;
 
 	elr = ext4_li_request_new(sb, first_not_zeroed);
-- 
2.35.1