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init: Initialize noop_backing_dev_info early

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[ Upstream commit 4bca7e80b6455772b4bf3f536dcbc19aac424d6a ]

noop_backing_dev_info is used by superblocks of various
pseudofilesystems such as kdevtmpfs. After commit 10e14073107d
("writeback: Fix inode->i_io_list not be protected by inode->i_lock
error") this broke because __mark_inode_dirty() started to access more
fields from noop_backing_dev_info and this led to crashes inside
locked_inode_to_wb_and_lock_list() called from __mark_inode_dirty().
Fix the problem by initializing noop_backing_dev_info before the
filesystems get mounted.

Fixes: 10e14073107d ("writeback: Fix inode->i_io_list not be protected by inode->i_lock error")
Reported-and-tested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reported-and-tested-by: Alexandru Elisei <alexandru.elisei@arm.com>
Reported-and-tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jan Kara
2022-06-15 15:22:29 +02:00
committed by Greg Kroah-Hartman
parent 04cdec4186
commit ca67881dce
3 changed files with 6 additions and 9 deletions
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2
include/linux/backing-dev.h
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@@ -121,6 +121,8 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio);
extern struct backing_dev_info noop_backing_dev_info;
int bdi_init(struct backing_dev_info *bdi);
/**
* writeback_in_progress - determine whether there is writeback in progress
* @wb: bdi_writeback of interest