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Al Viro afa5ceab9d better lockdep annotations for simple_recursive_removal() 
[ Upstream commit 2a8061ee5e ]

We want a class that nests outside of I_MUTEX_NORMAL (for the sake of
callbacks that might want to lock the victim) and inside I_MUTEX_PARENT
(so that a variant of that could be used with parent of the victim
held locked by the caller).

In reality, simple_recursive_removal()
	* never holds two locks at once
	* holds the lock on parent of dentry passed to callback
	* is used only on the trees with fixed topology, so the depths
are not changing.

So the locking order is actually fine.

AFAICS, the best solution is to assign I_MUTEX_CHILD to the locks
grabbed by that thing.

Reported-by: syzbot+169de184e9defe7fe709@syzkaller.appspotmail.com
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-20 18:30:20 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.