e9b10713e8
When a key is added, existing directory dentries in the DCACHE_NOKEY_NAME form are moved by the VFS to the plaintext version. But, since they have the DCACHE_OP_REVALIDATE flag set, revalidation will be done at each lookup only to return immediately, since plaintext dentries can't go stale until eviction. This patch optimizes this case, by dropping the flag once the nokey_name dentry becomes plain-text. Note that non-directory dentries are not moved this way, so they won't be affected. Of course, this can only be done if fscrypt is the only thing requiring revalidation for a dentry. For this reason, we only disable d_revalidate if the .d_revalidate hook is fscrypt_d_revalidate itself. It is safe to do it here because when moving the dentry to the plain-text version, we are holding the d_lock. We might race with a concurrent RCU lookup but this is harmless because, at worst, we will get an extra d_revalidate on the keyed dentry, which will still find the dentry to be valid. Finally, now that we do more than just clear the DCACHE_NOKEY_NAME in fscrypt_handle_d_move, skip it entirely for plaintext dentries, to avoid extra costs. Reviewed-by: Eric Biggers <ebiggers@google.com> Link: https://lore.kernel.org/r/20240221171412.10710-5-krisman@suse.de Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de> |
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|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 Restructured Text 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.