This is a note to let you know that I've just added the patch titled ext4: don't run ext4lazyinit for read-only filesystems to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: ext4-don-t-run-ext4lazyinit-for-read-only-filesystem.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit ebff1dc71ffdc2112dbb9adef79b8f18b027da42 Author: Josh Triplett <josh@xxxxxxxxxxxxxxxx> Date: Sun Jul 31 20:24:53 2022 -0700 ext4: don't run ext4lazyinit for read-only filesystems [ 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@xxxxxxxxxxxxxxxx> Reviewed-by: Lukas Czerner <lczerner@xxxxxxxxxx> Link: https://lore.kernel.org/r/48b41da1498fcac3287e2e06b660680646c1c050.1659323972.git.josh@xxxxxxxxxxxxxxxx Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> 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);