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04f0955b60Mateusz Guzik <mjguzik@gmail.com> says: In short, MAY_WRITE checks are elided. This obsoletes the idea of pre-computing if perm checks are necessary as that turned out to be too hairy. The new code has 2 more branches per path component compared to that idea, but the perf difference for typical paths (< 6 components) was basically within noise. To be revisited if someone(tm) removes other slowdowns. Instead of the pre-computing thing I added IOP_FASTPERM_MAY_EXEC so that filesystems like btrfs can still avoid the hard work. * patches from https://patch.msgid.link/20251107142149.989998-1-mjguzik@gmail.com: fs: retire now stale MAY_WRITE predicts in inode_permission() btrfs: utilize IOP_FASTPERM_MAY_EXEC fs: speed up path lookup with cheaper handling of MAY_EXEC Link: https://patch.msgid.link/20251107142149.989998-1-mjguzik@gmail.com Signed-off-by: Christian Brauner <brauner@kernel.org> |
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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.