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From: Xin LI <delphij@FreeBSD.org>
Date: Tue, 18 Nov 2014 18:40:02 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r274673 -
 head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: delphij
Date: Tue Nov 18 18:40:01 2014
New Revision: 274673
URL: https://svnweb.freebsd.org/changeset/base/274673

Log:
  Allow tuning zfs_max_recordsize via loader tunable.  Tuning is NOT
  recommended.
  
  Requested by:	Slawa Olhovchenkov <slw zxy spb ru>
  MFC after:	2 weeks

Modified:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c	Tue Nov 18 18:03:40 2014	(r274672)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c	Tue Nov 18 18:40:01 2014	(r274673)
@@ -51,6 +51,8 @@
 #include <sys/dsl_userhold.h>
 #include <sys/dsl_bookmark.h>
 
+SYSCTL_DECL(_vfs_zfs);
+
 /*
  * The SPA supports block sizes up to 16MB.  However, very large blocks
  * can have an impact on i/o latency (e.g. tying up a spinning disk for
@@ -61,6 +63,9 @@
  * of this setting.
  */
 int zfs_max_recordsize = 1 * 1024 * 1024;
+SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RDTUN,
+    &zfs_max_recordsize, 0,
+    "Maximum block size.  Expect dragons when tuning this.");
 
 #define	SWITCH64(x, y) \
 	{ \