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Xin LI 46413cedf7 Reduce disk write load in /usr/libexec/save-entropy.
Before this commit, the save-entropy script rotates entropy files
like logs. This involves creating a new file that holds the entropy
and renaming of all existing entropy files. However, the entropy
data do not really need to be kept in a particular order, and
replacing the oldest file is sufficient.

This commit replaces the rotation with a scan in the
[1..entropy_save_num] space that finds the first empty slot, or
the slot of the oldest file, and writes entropy into that slot.

This also fixes an issue that prevents save-entropy from saving
any entropy when there is one non-regular file in any slot as a
side effect.

Based on an earlier patch from peterj@.

PR:		134225
Reported by:	peterj
Reviewed by:	csprng (cem, markm)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D22612
2019-11-30 20:06:53 +00:00
bin Add iflag=fullblock to dd 2019-09-30 22:00:48 +00:00
cddl MFV r354383: 10592 misc. metaslab and vdev related ZoL bug fixes 2019-11-21 13:35:43 +00:00
contrib auditd(8): fix long-standing uninitialized memory use bug 2019-11-28 00:46:03 +00:00
crypto sshd: make getpwclass wrapper MON_ISAUTH not MON_AUTH 2019-11-20 16:30:37 +00:00
etc Create /etc/os-release file. 2019-11-20 23:45:31 +00:00
gnu Get the readline header from the installed header instead of the from the source 2019-09-12 15:50:14 +00:00
include Import devicetree files from Linux 5.4 2019-11-28 19:05:03 +00:00
kerberos5 Fix generation of krb5-config with LC_CTYPE=*.UTF-8 2019-07-01 11:47:45 +00:00
lib The fdlibm hypot() implementations shouldn't potentially left-shift 2019-11-26 22:01:09 +00:00
libexec Reduce disk write load in /usr/libexec/save-entropy. 2019-11-30 20:06:53 +00:00
release Remove picobsd build scripts and the remaining tinyware 2019-11-05 02:30:41 +00:00
rescue Remove unused defines since r147075 2019-07-12 04:44:50 +00:00
riscv/sifive Import riscv DTS files 2019-11-28 19:38:57 +00:00
sbin Capitalize some user-visible output messages in 2019-11-30 14:17:45 +00:00
secure caroot: commit initial bundle 2019-10-04 02:34:20 +00:00
share Remove the trm(4) driver 2019-11-28 02:32:17 +00:00
stand loader.efi: efipart needs better support detecting nested partitions 2019-11-30 09:11:28 +00:00
sys smp: cast the read in quiesce_all_critical through void * 2019-11-30 19:33:02 +00:00
targets - Retire pc-sysinstall(8) 2019-09-03 19:42:04 +00:00
tests procdesc: allow to collect status through wait(1) if process is traced 2019-11-25 18:33:21 +00:00
tools libclang_rt: enable on powerpc* 2019-11-23 19:35:09 +00:00
usr.bin Correct date and time of George Harrison's death. 2019-11-29 23:04:45 +00:00
usr.sbin Fix typos. 2019-11-27 10:26:37 +00:00
.arcconfig callsign isn't required anymore 2016-09-29 06:19:45 +00:00
.arclint arc lint: ignore /tests/ in chmod 2017-12-19 03:38:06 +00:00
.cirrus.yml cirrus.yml: stop fetching OVMF.fd now that we're using the pkg 2019-07-30 16:40:33 +00:00
.clang-format Add a basic clang-format configuration file 2019-06-07 15:23:52 +00:00
.gitattributes Add a basic clang-format configuration file 2019-06-07 15:23:52 +00:00
.gitignore .gitignore: Add LINT kernel configurations generated into SRCDIR 2019-08-10 18:22:22 +00:00
COPYRIGHT Happy New Year 2019! 2019-01-01 00:25:25 +00:00
LOCKS LOCKS: update current locks 2018-06-09 03:08:04 +00:00
MAINTAINERS [skip ci] Add me to MAINTAINERS for fusefs 2019-07-28 15:20:47 +00:00
Makefile Take arm.arm (armv5) out of universe 2019-11-03 19:36:34 +00:00
Makefile.inc1 Update Makefile.inc1 dtc comment 2019-11-26 14:25:50 +00:00
Makefile.libcompat libcompat: build 32-bit rtld and ldd as part of "everything" 2019-11-07 22:58:10 +00:00
Makefile.sys.inc AUTO_OBJ: For all top-level targets enforce using an OBJDIR. 2017-12-05 21:29:47 +00:00
ObsoleteFiles.inc Remove the trm(4) driver 2019-11-28 02:32:17 +00:00
README README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
README.md README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
RELNOTES Document iwm(4) support for 9000-series devices. 2019-11-08 00:01:37 +00:00
UPDATING Revert r354909: Make the warning for deprecated NO_ variables an error. 2019-11-22 18:41:09 +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
		and Distribution License.

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.
		Please see gnu/COPYING* for more information.

include		System include files.

kerberos5	Kerberos5 (Heimdal) package.

lib		System libraries.

libexec		System daemons.

release		Release building Makefile & associated tools.

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
		used in release builds. NOTES contains documentation of
		all possible entries.

tests		Regression tests which can be run by Kyua.  See tests/README
		for additional information.

tools		Utilities for regression testing and miscellaneous tasks.

usr.bin		User commands.

usr.sbin	System administration commands.

For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:

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