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[ Upstream commit4be5975aea] Further fix the file locking in the afs filesystem client in a number of ways, including: (1) Don't submit the operation to obtain a lock from the server in a work queue context, but rather do it in the process context of whoever issued the requesting system call. (2) The owner of the file_lock struct at the front of the pending_locks queue now owns right to talk to the server. (3) Write locks can be instantly granted if they don't overlap with any other locks *and* we have a write lock on the server. (4) In the event of an authentication/permission error, all other matching pending locks requests are also immediately aborted. (5) Properly use VFS core locks_lock_file_wait() to distribute the server lock amongst local client locks, including waiting for the lock to become available. Test with: sqlite3 /afs/.../scratch/billings.sqlite <<EOF CREATE TABLE hosts ( hostname varchar(80), shorthost varchar(80), room varchar(30), building varchar(30), PRIMARY KEY(shorthost) ); EOF With the version of sqlite3 that I have, this should fail consistently with EAGAIN, whether or not the program is straced (which introduces some delays between lock syscalls). Fixes:0fafdc9f88("afs: Fix file locking") Reported-by: Jonathan Billings <jsbillin@umich.edu> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <sashal@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 Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
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.