Illumos #3422, #3425

3422 zpool create/syseventd race yield non-importable pool
3425 first write to a new zvol can fail with EFBIG

Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>

References:
  illumos/illumos-gate@bda8819455defbccd06981d9a13b240b682a3d50
  https://www.illumos.org/issues/3422
  https://www.illumos.org/issues/3425

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1390
Allow setting a lower ashift with -o ashift

Previous patches have allowed you to set an increased ashift to
avoid doing 512b IO with 4k sector devices.  However, it was not
possible to set the ashift lower than the reported physical sector
size even when a smaller logical size was supported.  In practice,
there are several cases where settong a lower ashift is useful:

* Most modern drives now correctly report their physical sector
  size as 4k.  This causes zfs to correctly default to using a 4k
  sector size (ashift=12).  However, for some usage models this
  new default ashift value causes an unacceptable increase in
  space usage.  Filesystems with many small files may see the
  total available space reduced to 30-40% which is unacceptable.

* When replacing a drive in an existing pool which was created
  with ashift=9 a modern 4k sector drive cannot be used.  The
  'zpool replace' command will issue an error that the new drive
  has an 'incompatible sector alignment'.  However, by allowing
  the ashift to be manual specified as smaller, non-optimal,
  value the device may still be safely used.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1381
Closes #1328
Issue #967
Issue #548
Remove .readdir from zpl_file_operations table

The zpl_readdir() function shouldn't be registered as part of
the zpl_file_operations table, it must only be part of the
zpl_dir_file_operations table.  By removing this callback
the VFS will now correctly return ENOTDIR when calling
getdents() on a file.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1404
Trivial spelling fix

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1411
Add date+branch to Release.
Correctly return ERANGE in getxattr(2)

According to the getxattr(2) man page the ERANGE errno should be
returned when the size of the value buffer is to small to hold the
result.  Prior to this patch the implementation would just truncate
the value to size bytes.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1408
Fix various generic kmod RPM spec issues.

There are a number of issues with the generic kmod RPM spec in its
current state:
 - The "%{__id_u}" macro seems to not be available on some systems (e.g.
   Debian squeeze). It appears it has been deprecated. Use "${__id} -u"
   instead.
 - The way the "--with-linux=" configure option is generated in the
   non-RHEL/Fedora case is completely wrong with various newline and
   escaping issues (also, $kernel_version is not available in the
   generator context).

The second issue made the generator shell snippet (almost) silently
fail, which under specific circumstances can result in broken builds
against the wrong kernel sources.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1416
Possibility to disable (not start) zfs at bootup.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1402
Support .nogitrelease file

When building a custom release in a git tree provide the ability
to prevent the release field from being overwritten by the
`git describe` output.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1402
Add --bump=0 to alien

Preserve the release field when creating Debian packages.  The
--keep-version option was not used because it results in a failure
when the git '<commit>_<hash>' syntax is used for the release.
The '_' is a valid character for RPM packages but not for DEBs.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Issue #1402
Issue #928
Set RPM_DEFINE_COMMON options

When the kmod packaging was introduced the ability to pass the
--enable-debug and --enable-dmu-tx options from configure all
the way through to `make rpm|deb` was accidenally lost.  Update
ZFS_AC_RPM to explicitlu set RPM_DEFINE_COMMON with these
rpmbuild defines.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1402
Ignore *.{deb,rpm,tar.gz} files in the top directory.

These are build products and should be ignored.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Issue #1402
Fix txg_quiesce thread deadlock

A deadlock was accidentally introduced by commit e95853a which
can occur when the system is under memory pressure.  What happens
is that while the txg_quiesce thread is holding the tx->tx_cpu
locks it enters memory reclaim.  In the context of this memory
reclaim it then issues synchronous I/O to a ZVOL swap device.
Because the txg_quiesce thread is holding the tx->tx_cpu locks
a new txg cannot be opened to handle the I/O.  Deadlock.

The fix is straight forward.  Move the memory allocation outside
the critical region where the tx->tx_cpu locks are held.  And for
good measure change the offending allocation to KM_PUSHPAGE to
ensure it never attempts to issue I/O during reclaim.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1274
Enable retrieving key from URI.
+ Enable the curl code that was already there.
+ Fixes #24.