rmacklem bfcb2b538f Add non-blocking trylock variants for the rangelock functions.
A future patch that will add a Linux compatible copy_file_range(2) syscall
needs to be able to lock the byte ranges of two files concurrently.
To do this without a risk of deadlock, a non-blocking variant of
vn_rangelock_rlock() called vn_rangelock_tryrlock() was needed.
This patch adds this, along with vn_rangelock_trywlock(), in order to
do this.
The patch also adds a couple of comments, that I hope clarify how the
algorithm used in kern_rangelock.c works.

Reviewed by:	kib, asomers (previous version)
Differential Revision:	https://reviews.freebsd.org/D20645
2019-06-27 23:10:40 +00:00
2019-06-25 04:50:09 +00:00
2019-06-25 04:50:09 +00:00
2018-11-19 22:18:18 +00:00
2019-05-28 21:54:12 +00:00
2019-06-25 04:50:09 +00:00
2016-09-29 06:19:45 +00:00
2017-12-19 03:38:06 +00:00
2018-07-01 13:50:37 +00:00
2019-01-01 00:25:25 +00:00
2018-06-09 03:08:04 +00:00
2019-06-21 00:33:45 +00:00

FreeBSD Source:

This is the top level of the FreeBSD source directory. This file was last revised on: FreeBSD

FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.

For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.

The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.

Source Roadmap:

bin		System/user commands.

cddl		Various commands and libraries under the Common Development
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contrib		Packages contributed by 3rd parties.

crypto		Cryptography stuff (see crypto/README).

etc		Template files for /etc.

gnu		Various commands and libraries under the GNU Public License.
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include		System include files.

kerberos5	Kerberos5 (Heimdal) package.

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rescue		Build system for statically linked /rescue utilities.

sbin		System commands.

secure		Cryptographic libraries and commands.

share		Shared resources.

stand		Boot loader sources.

sys		Kernel sources.

sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
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tests		Regression tests which can be run by Kyua.  See tests/README
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tools		Utilities for regression testing and miscellaneous tasks.

usr.bin		User commands.

usr.sbin	System administration commands.

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https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html

Description
freebsd kernel with SKQ
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