Tighten spl dependency on spl-kmod

Make spl depend on the same version of spl-kmod, rather than on same or
better. When yum repository contains a number of versions the dependency
resolution breaks on trying to install non-latest version.

Signed-off-by: Cyril Plisko <cyril.plisko@mountall.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes zfsonlinux/zfs#1677
Retroactively fix bogus %changelog date

New versions of rpmbuild detect the invalid date which was added
incorrectly to the changelog.  To silence this noise fix it.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #306
Document SPL module parameters.

This is a first draft of a spl-module-parameters(5) man page. I have
just extracted the parameter name and its description with modinfo,
then checked the source what type it is and its default value.

This will need more work, preferably someone that actually know these
values and what to use them for.  Similar to zfsonlinux/zfs#1856, but
for the spl.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes zfsonlinux/zfs#1856
Linux 3.13 compat: Remove unused flags variable from __cv_init()

GCC 4.8.1 complained about an unused flags variable when building
against Linux 2.6.26.8:

/var/tmp/portage/sys-kernel/spl-9999/work/spl-9999/module/spl/../../module/spl/spl-condvar.c:
In function ‘__cv_init’:
/var/tmp/portage/sys-kernel/spl-9999/work/spl-9999/module/spl/../../module/spl/spl-condvar.c:39:6:
error: variable ‘flags’ set but not used
[-Werror=unused-but-set-variable]
  int flags = KM_SLEEP;
        ^
	cc1: all warnings being treated as errors

Additionally, the superfluous code uses a preempt_count variable that is
no longer available on Linux 3.13. Deleting the unnecessary code fixes a
Linux 3.13 compatibility issue.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #312
Linux 3.13 compat: Pass NULL for new delegated inode argument

This check was originally added for SLES10, a093c6a, to check for
a 'struct vfsmount *' argument which they added.  However, since
SLES10 is based on a 2.6.16 kernel which is no longer supported
this functionality was dropped.  The checks were refactored to
support Linux 3.13 without concern for historical versions.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #312
Add module versioning

Use the standard Linux MODULE_VERSION macro to expose the installed
spl and splat module versions.  This will also automatically add a
checksum of the .c files and headers in "srcversion".  See:

  /sys/module/spl/version
  /sys/module/spl/srcversion
  /sys/module/splat/version
  /sys/module/splat/srcversion

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes zfsonlinux/zfs#1923

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Include linux/vmalloc.h for ARM and Sparc

Related to issue #257 which added Linux 3.10 compatibility.  For
ARM and Sparc architectures we must explicitly include the
<linux/vmalloc.h> header to ensure the vmalloc_info structure
is always defined when available.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #257
Closes #291
Remove default taskq thread to CPU bindings

When this code was written it appears to have been assumed that
every taskq would have a large number of threads.  In this case
it would make sense to attempt to evenly bind the threads over
all available CPUs.  However, it failed to consider that creating
taskqs with a small number of threads will cause the CPUs with
lower ids become over-subscribed.

For this reason the kthread_bind() call is being removed and
we're leaving the kernel to schedule these threads as it sees fit.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #325
Define the needed ISA types for Sparc

Add the minimum required ISA types to support the Sparc
architecture.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: marku89 <mar42@kola.li>
Closes #317
Remove incorrect use of EXTRA_DIST for man pages

Setting the 'dist_' prefix is the correct way to instruct Automake
to include these files in the distribution.  The EXTRA_DIST variable
is reserved for files which are not covered by the automatic rules.

  http://www.gnu.org/software/automake/manual/automake.html#Basics

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
splat kmem:slab_reclaim: Test cleanup

By setting __GFP_NORETRY the kernel memory reclaim logic was allowed to
abort early and dump a falled allocation stack to the console.  Since
this was done in a tight loop to fill memory it could result in a large
number of stacks being dumped to the console.  This in turn slowed down
the test sufficiently so it exceeded the time limit and failed.

To resolve this issue the __GFP_NORETRY flag is being removed.  This is
how it should have been called originally to ensure we're simulating
the behavior of most callers which will use the GFP_KERNEL flag.

In addition, the reclaim granularity of 1000 objects was far to coarse
for this to be a realistic test.  For kmem:slab_reclaim there might
only be a few thousand objects total in the cache.  Therefore, the
SPLAT_KMEM_OBJ_RECLAIM constant for these tests was lowered.  This
will cause the reclaim callback to run more frequently which makes
for a better test case.

The frequency of the cache reaping in kmem:slab_reap was increased
to accommodate the reduced number of objects released during the
reclaim.

These changes only impact the test cases and were done to remove
false positives caused by the test case itself.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
splat cred:groupmember: Fix false positives

Due to certain assumptions made in the the cred:groupmember test it
could result in false positives when run on specific distributions.
This was solely a bug in the test case and not in the groupmember()
function which the test case was validating.

To prevent future false positives the test case has been rewritten
to be both more rigerous and to make fewer assumptions about the
system.

Minor style cleanup was done to cr_groups_search() and groupmember()
functions.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Support post-3.13 kthread_create() semantics.

Provide spl_kthread_create() as a wrapper to the kernel's kthread_create()
to provide pre-3.13 semantics.  Re-try if the call is interrupted or if it
would have returned -ENOMEM.  Otherwise return NULL.

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #339
De-inline spl_kthread_create().

The function was defined as a static inline with variable arguments
which causes gcc to generate errors on some distros.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #346
Call kthread_create() correctly with fixed arguments.

The kernel's kthread_create() function is defined as "..." and there is
no va_list variant at the moment.  The task name is pre-formatted into
a local buffer and passed to kthread_create() with fixed arguments.

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #347
Simplify hostid logic

There is plenty of compatibility code for a hw_hostid
that isn't used by anything. At the same time, there are apparently
issues with the current hostid logic. coredumb in #zfsonlinux on
freenode reported that Fedora 17 changes its hostid on every boot, which
required force importing his pool. A suggestion by wca was to adopt
FreeBSD's behavior, where it treats hostid as zero if /etc/hostid does
not exist

Adopting FreeBSD's behavior permits us to eliminate plenty of code,
including a userland helper that invokes the system's hostid as a
fallback.

Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #224
This patch add a CTASSERT macro for compile time assertion.

This macro makes the compile to spit "mixed definition and code"
warning, I can't find a way to avoid it.

This patch lays some groundwork for the persistent l2arc feature.
See https://www.illumos.org/issues/3525.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #303
Add ddi_time_after and friends

When comparing times gotten from ddi_get_lbolt, we have to take account of
wrap around of jiffies. Therefore, we cannot use 't1 < t2'. Instead we should
use 't1 - t2 < 0'.

This patch add ddi_time_after and friends to address this issue. They have
strict type restriction, clock_t for vanilla and int64_t for 64 version, to
prevent type conversion from screwing things.

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #335
Expose max/min objs per slab and max slab size

By default maximal number of objects in slab can't exceed (16*2 - 1) and slab
size can't exceed 32M.
Today's high end servers having couple hundreds of RAM available for ARC may
run into a trouble with virtual memory because of the restriction mentioned
above.

Problem:
Reasons for very high number of virtual memory allocations:
	* Real slab size very small relative to the size of the entire RAM
	* Slabs allocated on virtual memory and fill entire ARC

The result is very high number of allocated virtual memory ranges (hundreds of
ranges). When virtual memory subsystem manages high number of ranges its
performance become so poor that it freezes from time to time.

Solution:
Number of objects per slab should be increased taking into account maximal
slab size which can also be increased if needed.

Signed-off-by: Andrey Vesnovaty <andrey.vesnovaty@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #337
Change spl_kmem_cache_expire default setting to 2

This behavior is more consistent with the way memory reclaim
is expected to work under Linux.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #349