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Mark inodes without acls with cache_no_acl() in __ext4_iget() so that path lookup can run in RCU mode from the start. This is interesting in particular for the case where the file owner does the lookup because in that case end up constantly hitting the slow path otherwise. We drop out from the fast path (because ACL state is unknown) but never end up calling check_acl() to cache ACL state. The problem was originally analyzed by Linus and fix tested by Matheusz, I'm just putting it into mergeable form :). Link: https://lore.kernel.org/all/CAHk-=whSzc75TLLPWskV0xuaHR4tpWBr=LduqhcCFr4kCmme_w@mail.gmail.com Reported-by: Mateusz Guzik <mjguzik@gmail.com> Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Baokun Li <libaokun1@huawei.com> Message-ID: <20251125101340.24276-2-jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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.