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Illumos #3137 L2ARC compression

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3137 L2ARC compression
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Dan McDonald <danmcd@nexenta.com>

References:
  illumos/illumos-gate@aad02571bc
  https://www.illumos.org/issues/3137
  http://wiki.illumos.org/display/illumos/L2ARC+Compression

Notes for Linux port:

A l2arc_nocompress module option was added to prevent the
compression of l2arc buffers regardless of how a dataset's
compression property is set.  This allows the legacy behavior
to be preserved.

Ported by: James H <james@kagisoft.co.uk>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1379
This commit is contained in:
Saso Kiselkov
2013-08-01 13:02:10 -07:00
committed by Brian Behlendorf
parent c11a12bc3b
commit 3a17a7a99a
7 changed files with 423 additions and 79 deletions
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include/sys/dmu_objset.h
+3
View File
@@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
*/
/* Portions Copyright 2010 Robert Milkowski */
@@ -129,6 +130,8 @@ struct objset {
((os)->os_secondary_cache == ZFS_CACHE_ALL || \
(os)->os_secondary_cache == ZFS_CACHE_METADATA)
#define DMU_OS_IS_L2COMPRESSIBLE(os) ((os)->os_compress != ZIO_COMPRESS_OFF)
/* called from zpl */
int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
int dmu_objset_own(const char *name, dmu_objset_type_t type,