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Brian Behlendorf 3fd70ee6b0 Fix 'negative objects to delete' warning 
Normally when the arc_shrinker_func() function is called the return
value should be:

   >=0 - To indicate the number of freeable objects in the cache, or
   -1  - To indicate this cache should be skipped

However, when the shrinker callback is called with 'nr_to_scan' equal
to zero.  The caller simply wants the number of freeable objects in
the cache and we must never return -1.  This patch reorders the
first two conditionals in arc_shrinker_func() to ensure this behavior.

This patch also now explictly casts arc_size and arc_c_min to signed
int64_t types so MAX(x, 0) works as expected.  As unsigned types
we would never see an negative value which defeated the purpose of
the MAX() lower bound and broke the shrinker logic.

Finally, when nr_to_scan is non-zero we explictly prevent all reclaim
below arc_c_min.  This is done to prevent the Linux page cache from
completely crowding out the ARC.  This limit is tunable and some
experimentation is likely going to be required to set it exactly right.
For now we're sticking with the OpenSolaris defaults.

Closes #218
Closes #243
2011-05-18 10:29:22 -07:00
cmd Fix awk usage 2011-05-06 10:16:04 -07:00
config Fix distribution detection for gentoo 2011-05-14 08:54:48 -07:00
dracut Fix 'zfs set volsize=N pool/dataset' 2011-05-02 08:54:40 -07:00
etc Remove root 'ls' after mount workaround 2011-05-12 15:01:35 -07:00
include Disable direct reclaim for z_wr_* threads 2011-05-06 15:26:26 -07:00
lib Fix 'zfs set volsize=N pool/dataset' 2011-05-02 08:54:40 -07:00
man Fix 'zfs set volsize=N pool/dataset' 2011-05-02 08:54:40 -07:00
module Fix 'negative objects to delete' warning 2011-05-18 10:29:22 -07:00
patches Add build system 2010-08-31 13:41:27 -07:00
scripts Fix 'zfs set volsize=N pool/dataset' 2011-05-02 08:54:40 -07:00
.gitignore Ignore unsigned module build products 2010-03-09 14:14:09 -08:00
AUTHORS Add Gunnar Beutner to AUTHORS for his contributions 2011-04-19 14:14:51 -07:00
autogen.sh Minor packaging fixes 2010-09-01 15:42:32 -07:00
ChangeLog Add build system 2010-08-31 13:41:27 -07:00
configure Fix distribution detection for gentoo 2011-05-14 08:54:48 -07:00
configure.ac Set cmd paths in udev rules using --prefix 2011-03-25 10:05:09 -07:00
COPYING Relocate COPYING+COPYRIGHT, remove README cruft 2008-12-01 15:34:53 -08:00
COPYRIGHT Update COPYRIGHT to reference zpios CDDL exceptions. 2010-05-18 14:25:28 -07:00
DISCLAIMER Update COPYRIGHT and DISCLAIMER. 2010-05-18 10:32:23 -07:00
Makefile.am Add dracut support 2011-03-17 16:52:04 -07:00
Makefile.in Fix 'zfs set volsize=N pool/dataset' 2011-05-02 08:54:40 -07:00
META Prep zfs-0.6.0-rc4 tag 2011-05-03 10:29:05 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Fix markdown rendering 2010-09-15 09:09:37 -07:00
zfs_config.h.in Fix 'zfs set volsize=N pool/dataset' 2011-05-02 08:54:40 -07:00
zfs-modules.spec.in Fix rebuildable RPMs for el6/ch5 2011-04-08 10:22:42 -07:00
zfs-script-config.sh.in Unconditionally load core kernel modules 2010-11-11 11:38:25 -08:00
ZFS.RELEASE Update to onnv_147 2010-08-26 14:24:34 -07:00
zfs.spec.in Add parted and lsscsi dependencies to zfs-test 2011-04-19 15:22:46 -07:00

README.markdown

Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!

$ ./configure
$ make pkg

Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org