svn commit: r273267 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

Xin LI delphij at FreeBSD.org
Sat Oct 18 22:11:11 UTC 2014


Author: delphij
Date: Sat Oct 18 22:11:10 2014
New Revision: 273267
URL: https://svnweb.freebsd.org/changeset/base/273267

Log:
  Add tunable vfs.zfs.space_map_blksz for space map's maximum block size.
  
  MFC after:	2 weeks

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

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c	Sat Oct 18 19:36:11 2014	(r273266)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/space_map.c	Sat Oct 18 22:11:10 2014	(r273267)
@@ -37,6 +37,8 @@
 #include <sys/refcount.h>
 #include <sys/zfeature.h>
 
+SYSCTL_DECL(_vfs_zfs);
+
 /*
  * The data for a given space map can be kept on blocks of any size.
  * Larger blocks entail fewer i/o operations, but they also cause the
@@ -44,6 +46,8 @@
  * when only a few blocks have changed since the last transaction group.
  */
 int space_map_blksz = (1 << 12);
+SYSCTL_INT(_vfs_zfs, OID_AUTO, space_map_blksz, CTLFLAG_RDTUN, &space_map_blksz, 0,
+    "Maximum block size for space map.  Must be power of 2 and greater than 4096.");
 
 /*
  * Load the space map disk into the specified range tree. Segments of maptype


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