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Brian Behlendorf cc79a5c263 Treat spill block dbufs as meta data 
When the system attributes (SAs) for an object exceed what can
can be stored in the bonus area of a dnode a spill block is
allocated.  These spill blocks are currently considered data
blocks.  However, they should be accounted for as meta data
because they are effectively an extension of the dnode.

While this may seem like a minor accounting issue it has broader
implications.  The key thing to be aware of is that each spill
block will hold a reference on its parent dnode.  The dnode in
turn holds a reference on its dbuf in the dnode object.  This
means that a single 512 byte data buffer for a spill block can
pin over 16k of meta data.  This is analogous to the small file
situation described in 2b13331 where a relatively small number
of data buffer can cause the ARC to exceed the meta limit.

However, unlike the small file case a spill block can legitimately
be considered meta data.  By changing the spill block to meta data
they will now be dropped from the cache when the meta limit is
reached.  This then allows the dnodes and dbufs which the spill
block was pinning to be released.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Prakash Surya <surya1@llnl.gov>
Closes #2294
2014-05-05 13:56:59 -07:00
cmd ztest: Switch to LWP rwlock interface 2014-05-01 15:53:58 -07:00
config Refactor inode_owner_or_capable() autotools check 2014-05-01 10:06:49 -07:00
dracut Refresh dracut module setup 2013-03-21 12:51:06 -07:00
etc Remove SELinux enforcing check from init scripts 2014-05-02 11:37:46 -07:00
include libspl: Implement LWP rwlock interface 2014-05-01 15:53:52 -07:00
lib libspl: Implement LWP rwlock interface 2014-05-01 15:53:52 -07:00
man Initial implementation of zed (ZFS Event Daemon) 2014-04-02 13:10:03 -07:00
module Treat spill block dbufs as meta data 2014-05-05 13:56:59 -07:00
patches Adding grub2 mkconfig support patch 2012-07-30 16:17:23 -07:00
rpm Initial implementation of zed (ZFS Event Daemon) 2014-04-02 13:10:03 -07:00
scripts Various zimport.sh fixes 2014-04-17 09:30:55 -07:00
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 Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
autogen.sh build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
configure.ac Initial implementation of zed (ZFS Event Daemon) 2014-04-02 13:10:03 -07:00
copy-builtin Consistent menuconfig name 2012-08-26 13:49:37 -07:00
COPYRIGHT Refresh links to web site 2013-03-06 15:46:41 -08:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am cstyle: Exclude several files from 'make checkstyle' 2013-12-18 16:46:35 -08:00
META Tag zfs-0.6.2 2013-08-22 13:33:26 -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