Illumos 3557, 3558, 3559, 3560

3557 dumpvp_size is not updated correctly when a dump zvol's size is changed
3558 setting the volsize on a dump device does not return back ENOSPC
3559 setting a volsize larger than the space available sometimes succeeds
3560 dumpadm should be able to remove a dump device
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Approved by: Albert Lee <trisk@nexenta.com>

References:
  https://www.illumos.org/issues/3559
  https://github.com/illumos/illumos-gate/commit/c61ea56

Porting notes:
- Internal zvol.c changes not applied due to implementation differences.
  The external interface and behavior was already consistent with the
  latest upstream code.
- Retired 2.6.28 HAVE_CHECK_DISK_SIZE_CHANGE configure check.  All
  supported kernels (2.6.32 and newer) provide this interface.

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4217

config/kernel-check-disk-size-change.m4

@@ -1,18 +0,0 @@
-dnl #
-dnl # 2.6.28 API change
-dnl # Added check_disk_size_change() helper function.
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE],
-	[AC_MSG_CHECKING([whether check_disk_size_change() is available])
-	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		#include <linux/fs.h>
-	], [
-		check_disk_size_change(NULL, NULL);
-	], [check_disk_size_change], [fs/block_dev.c], [
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_CHECK_DISK_SIZE_CHANGE, 1,
-		          [check_disk_size_change() is available])
-	], [
-		AC_MSG_RESULT(no)
-	])
-])

config/kernel.m4

@@ -72,7 +72,6 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_D_SET_D_OP
 	ZFS_AC_KERNEL_D_REVALIDATE_NAMEIDATA
 	ZFS_AC_KERNEL_CONST_DENTRY_OPERATIONS
-	ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
 	ZFS_AC_KERNEL_TRUNCATE_SETSIZE
 	ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
 	ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY