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Andriy Gapon ef56b0780c Account for ashift when gathering buffers to be written to l2arc device 
If we don't account for that, then we might end up overwriting disk
area of buffers that have not been evicted yet, because l2arc_evict
operates in terms of disk addresses.

The discrepancy between the write size calculation and the actual
increment to l2ad_hand was introduced in commit 3a17a7a9.

The change that introduced l2ad_hand alignment was almost correct
as the write size was accumulated as a sum of rounded buffer sizes.
See commit illumos/illumos-gate@e14bb32.

Also, we now consistently use asize / a_sz for the allocated size and
psize / p_sz for the physical size.  The latter accounts for a
possible size reduction because of the compression, whereas the
former accounts for a possible subsequent size expansion because of
the alignment requirements.

The code still assumes that either underlying storage subsystems or
hardware is able to do read-modify-write when an L2ARC buffer size is
not a multiple of a disk's block size.  This is true for 4KB sector disks
that provide 512B sector emulation, but may not be true in general.
In other words, we currently do not have any code to make sure that
an L2ARC buffer, whether compressed or not, which is used for physical
I/O has a suitable size.

Note that currently the cache device utilization is calculated based
on the physical size, not the allocated size.  The same applies to
l2_asize kstat. That is wrong, but this commit does not fix that.
The accounting problem was introduced partially in commit 3a17a7a9
and partially in 3038a2b (accounting became consistent but in favour
of the wrong size).

Porting Notes:

Reworked to be C90 compatible and the 'write_psize' variable was
removed because it is now unused.

References:
  https://reviews.csiden.org/r/229/
  https://reviews.freebsd.org/D2764

Ported-by: kernelOfTruth <kerneloftruth@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3400
Closes #3433
Closes #3451
2015-06-25 08:57:16 -07:00
cmd Unify mount and share for 'zfs create/clone' 2015-06-17 11:01:16 -07:00
config Add zfs_sb_prune_aliases() function 2015-06-22 10:22:49 -07:00
contrib Add bash completions by Aneurin Price. 2014-08-06 15:03:28 -07:00
dracut Update dracut README 2015-06-18 11:58:53 -07:00
etc Additional SYSV init script fixes. 2015-06-17 13:30:03 -07:00
include Illumos 5701 - zpool list reports incorrect "alloc" value for cache devices 2015-06-25 08:51:44 -07:00
lib Add IMPLY() and EQUIV() macros 2015-06-24 15:11:48 -07:00
man Make metaslab_aliquot a module parameter. 2015-06-22 14:19:38 -07:00
module Account for ashift when gathering buffers to be written to l2arc device 2015-06-25 08:57:16 -07:00
rpm Base init scripts for SYSV systems 2015-05-28 14:14:53 -07:00
scripts Set zfs_autoimport_disable default value to 1 2015-02-17 16:09:41 -08:00
udev Open pools asynchronously after module load 2013-07-03 09:24:38 -07:00
.gitignore Ignore *.{deb,rpm,tar.gz} files in the top directory. 2013-04-24 16:18:59 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
AUTHORS Add a missing > to AUTHORS 2014-09-02 14:18:53 -07:00
autogen.sh build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
configure.ac Add RHEL style kmod packages 2015-03-27 14:41:48 -07:00
copy-builtin Consistent menuconfig name 2012-08-26 13:49:37 -07:00
COPYRIGHT Update ZED copyright boilerplate 2015-05-11 15:07:00 -07:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am Style check shell scripts 2015-05-20 14:10:03 -07:00
META Tag zfs-0.6.4 2015-04-08 20:16:45 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
zfs-script-config.sh.in Initial implementation of zed (ZFS Event Daemon) 2014-04-02 13:10:03 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

Native ZFS for Linux!

ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.

ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.

Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org