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2011067c64cachefiles uses some VFS interfaces (such as vfs_mkdir) which take an explicit mnt_idmap, and it passes &nop_mnt_idmap as cachefiles doesn't yet support idmapped mounts. It also uses the lookup_one_len() family of functions which implicitly use &nop_mnt_idmap. This mixture of implicit and explicit could be confusing. When we eventually update cachefiles to support idmap mounts it would be best if all places which need an idmap determined from the mount point were similar and easily found. So this patch changes cachefiles to use lookup_one(), lookup_one_unlocked(), and lookup_one_positive_unlocked(), passing &nop_mnt_idmap. This has the benefit of removing the remaining user of the lookup_one_len functions where permission checking is actually needed. Other callers don't care about permission checking and using these function only where permission checking is needed is a valuable simplification. This requires passing the name in a qstr. This is easily done with QSTR() as the name is always nul terminated, and often strlen is used anyway. ->d_name_len is removed as no longer useful. Signed-off-by: NeilBrown <neilb@suse.de> Link: https://lore.kernel.org/r/20250319031545.2999807-4-neil@brown.name 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.