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Andriy Gapon 3385c74539 MFV r319950: 5220 L2ARC does not support devices that do not provide 512B access 
FreeBSD note: the actual change has been in FreeBSD since r297848.  This
commit accounts for integration of that change with subsequent changes,
especially r320156 (MFV of r318946) and r314274.

illumos/illumos-gate@403a8da73c
403a8da73c

https://www.illumos.org/issues/5220
  There are disk devices that have logical sector size larger than 512B, for
  example 4KB. That is, their physical sector size is larger than 512B and they
  do not provide emulation for 512B sector sizes. For such devices both a data
  offset and a data size must be properly aligned. L2ARC should arrange that
  because it uses physical I/O.
  zio_vdev_io_start() performs a necessary transformation if io_size is not
  aligned to vdev_ashift, but that is done only for logical I/O. Something
  similar should be done in L2ARC code.
      * a temporary write buffer should be allocated if the original buffer is
        not going to be compressed and its size is not aligned
      * size of a temporary compression buffer should be ashift aligned
      * for the reads, if a size of a target buffer is not sufficiently large and
        it is not aligned then a temporary read buffer should be allocated

Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Saso Kiselkov <saso.kiselkov@nexenta.com>
Approved by: Dan McDonald <danmcd@joyent.com>
Author: Andriy Gapon <avg@FreeBSD.org>

MFC after:	3 weeks
2017-06-22 17:10:34 +00:00
bin Don't expect :sF_flag to fail anymore 2017-06-20 20:50:54 +00:00
cddl zfsd(8): Remove pidfile on shutdown 2017-06-20 19:45:02 +00:00
contrib In poolnodcommand(): TTL (-T) is only valid when adding a node to a 2017-06-22 12:46:48 +00:00
crypto Merge OpenSSL 1.0.2l. 2017-05-25 20:52:16 +00:00
etc Replace md(4) usage in diskless(8) script rc.initdiskless with tmpfs(5). 2017-06-15 20:06:41 +00:00
gnu Utilize SYSROOT from r320119 in places where DESTDIR may be wanting WORLDTMP. 2017-06-19 20:47:24 +00:00
include Update the DTS file from Linux 4.11 2017-06-20 02:28:15 +00:00
kerberos5 Disconnect heimdal version of qsort.c from build because we are already 2017-05-26 06:09:11 +00:00
lib Fix use-after-free introduced in r300388. 2017-06-22 05:10:16 +00:00
libexec Add MLINKS for atf-sh(3) to each of the functions it implements 2017-06-07 21:18:28 +00:00
release Remove groff from base 2017-06-07 23:00:34 +00:00
rescue DIRDEPS_BUILD: Update dependencies. 2017-05-09 01:48:23 +00:00
sbin Allow '_' in labels when specifying -L to newfs. 2017-06-20 21:26:42 +00:00
secure Merge OpenSSL 1.0.2l. 2017-05-25 20:52:16 +00:00
share Rework logic for skipping .depend/.meta file read/stat/writes. 2017-06-22 05:34:41 +00:00
sys MFV r319950: 5220 L2ARC does not support devices that do not provide 512B access 2017-06-22 17:10:34 +00:00
targets buildworld: Pass which world phase the build is in down to submakes. 2017-06-20 22:08:02 +00:00
tests Add abstime kqueue(2) timers and expand struct kevent members. 2017-06-17 00:57:26 +00:00
tools Update scescx test to print syscall number and arguments. 2017-06-12 21:16:37 +00:00
usr.bin join(1): Fix field ordering for -v output 2017-06-22 02:19:39 +00:00
usr.sbin makefs: add copies of NetBSD makefs msdos source files 2017-06-22 02:46:36 +00:00
.arcconfig callsign isn't required anymore 2016-09-29 06:19:45 +00:00
.arclint
COPYRIGHT Bump copyright year. 2016-12-31 12:41:42 +00:00
LOCKS
MAINTAINERS Due to time constraints remove myself as a vmm(4) maintainer. 2017-04-15 22:42:23 +00:00
Makefile By popular demand: change MAKE_GENERIC_KERNELS to MAKE_LINT_KERNELS. 2017-06-13 01:12:37 +00:00
Makefile.inc1 buildworld: Pass which world phase the build is in down to submakes. 2017-06-20 22:08:02 +00:00
Makefile.libcompat buildworld: Define SYSROOT to WORLDTMP. 2017-06-19 18:08:20 +00:00
ObsoleteFiles.inc Add more simple positive tests for chown(1) 2017-06-11 19:31:42 +00:00
README Correct the URL to instructions for updated system sources. 2017-05-15 15:18:36 +00:00
README.md Remove hard line breaks from README.md 2017-03-01 15:39:58 +00:00
UPDATING Fix punctionation in UPDATING and regen src.conf after r320127 2017-06-20 03:44:21 +00:00

README.md

FreeBSD Source:

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

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) and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables.

The buildkernel and installkernel targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags.

Building a kernel is a somewhat more involved process. See build(7), config(8), and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information.

Note: If you want to build and install the kernel with the buildkernel and installkernel targets, you might need to build world before. More information is available in the handbook.

The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used.

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.

sys				Kernel sources.

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:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html