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The locking around the ->get_parent() call brings no value. We are locking a child which is only used to find an inode and thence the parent inode number. All further activity involves the parent inode which may have several children so locking one child cannot protect the parent in any useful way. The filesystem must already ensure that only one 'struct inode' exists for a given inode, and will call d_obtain_alias() which contains the required locking to ensure only one dentry will be attached to that inode. So remove the unnecessary locking. Signed-off-by: NeilBrown <neil@brown.name> Link: https://lore.kernel.org/r/174190497326.9342.9313518146512158587@noble.neil.brown.name Signed-off-by: Christian Brauner <brauner@kernel.org>
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.