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Illumos #1092: zfs refratio property

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Add a "REFRATIO" property, which is the compression ratio based on
data referenced. For snapshots, this is the same as COMPRESSRATIO,
but for filesystems/volumes, the COMPRESSRATIO is based on the
data "USED" (ie, includes blocks in children, but not blocks
shared with the origin).

This is needed to figure out how much space a filesystem would
use if it were not compressed (ignoring snapshots).

Reviewed by: George Wilson <George.Wilson@delphix.com>
Reviewed by: Adam Leventhal <Adam.Leventhal@delphix.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Reviewed by: Richard Elling <richard.elling@richardelling.com>
Reviewed by: Mark Musante <Mark.Musante@oracle.com>
Reviewed by: Garrett D'Amore <garrett@nexenta.com>
Approved by: Garrett D'Amore <garrett@nexenta.com>

References to Illumos issue and patch:
- https://www.illumos.org/issues/1092
- https://github.com/illumos/illumos-gate/commit/187d6ac08a

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #340
This commit is contained in:
Matt Ahrens 2011-07-26 12:23:00 -07:00 committed by Brian Behlendorf
parent 6d974228ef
commit f5fc4acaa7
5 changed files with 31 additions and 7 deletions
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2
include/sys/fs/zfs.h
View File

@ -21,6 +21,7 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
/* Portions Copyright 2010 Robert Milkowski */
@ -122,6 +123,7 @@ typedef enum {
ZFS_PROP_DEDUP,
ZFS_PROP_MLSLABEL,
ZFS_PROP_SYNC,
ZFS_PROP_REFRATIO,
ZFS_NUM_PROPS
} zfs_prop_t;

2
lib/libzfs/libzfs_dataset.c
View File

@ -21,6 +21,7 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
#include <ctype.h>
@ -2025,6 +2026,7 @@ zfs_prop_get(zfs_handle_t *zhp, zfs_prop_t prop, char *propbuf, size_t proplen,
}
break;
case ZFS_PROP_REFRATIO:
case ZFS_PROP_COMPRESSRATIO:
if (get_numeric_property(zhp, prop, src, &source, &val) != 0)
return (-1);

17
man/man8/zfs.8
View File

@ -360,7 +360,7 @@ This property can also be referred to by its shortened column name, \fBavail\fR.
.ad
.sp .6
.RS 4n
The compression ratio achieved for this dataset, expressed as a multiplier. Compression can be turned on by running: \fBzfs set compression=on \fIdataset\fR\fR. The default value is \fBoff\fR.
For non-snapshots, the compression ratio achieved for the \fBused\fR space of this dataset, expressed as a multiplier. The \fBused\fR property includes descendant datasets, and, for clones, does not include the space shared with the origin snapshot. For snapshots, the \fBcompressratio\fR is the same as the \fBrefcompressratio\fR property. Compression can be turned on by running: \fBzfs set compression=on \fIdataset\fR\fR. The default value is \fBoff\fR.
.RE
.sp
@ -420,6 +420,19 @@ The amount of data that is accessible by this dataset, which may or may not be s
This property can also be referred to by its shortened column name, \fBrefer\fR.
.RE
.sp
.ne 2
.mk
.na
\fB\fBrefcompressratio\fR\fR
.ad
.sp .6
.RS 4n
The compression ratio achieved for the \fBreferenced\fR space of this
dataset, expressed as a multiplier. See also the \fBcompressratio\fR
property.
.RE
.sp
.ne 2
.mk
@ -1235,7 +1248,7 @@ Recursively destroy all dependents, including cloned file systems outside the ta
Force an unmount of any file systems using the \fBunmount -f\fR command. This option has no effect on non-file systems or unmounted file systems.
.RE
Extreme care should be taken when applying either the \fB-r\fR or the \fB-f\fR options, as they can destroy large portions of a pool and cause unexpected behavior for mounted file systems in use.
Extreme care should be taken when applying either the \fB-r\fR or the \fB-R\fR options, as they can destroy large portions of a pool and cause unexpected behavior for mounted file systems in use.
.RE
.sp

4
module/zcommon/zfs_prop.c
View File

@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
/* Portions Copyright 2010 Robert Milkowski */
@ -311,6 +312,9 @@ zfs_prop_init(void)
zprop_register_number(ZFS_PROP_COMPRESSRATIO, "compressratio", 0,
PROP_READONLY, ZFS_TYPE_DATASET,
"<1.00x or higher if compressed>", "RATIO");
zprop_register_number(ZFS_PROP_REFRATIO, "refcompressratio", 0,
PROP_READONLY, ZFS_TYPE_DATASET,
"<1.00x or higher if compressed>", "REFRATIO");
zprop_register_number(ZFS_PROP_VOLBLOCKSIZE, "volblocksize",
ZVOL_DEFAULT_BLOCKSIZE, PROP_ONETIME,
ZFS_TYPE_VOLUME, "512 to 128k, power of 2", "VOLBLOCK");

13
module/zfs/dsl_dataset.c
View File

@ -20,6 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2011 by Delphix. All rights reserved.
*/
#include <sys/dmu_objset.h>
@ -2153,7 +2154,7 @@ dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
void
dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
{
uint64_t refd, avail, uobjs, aobjs;
uint64_t refd, avail, uobjs, aobjs, ratio;
dsl_dir_stats(ds->ds_dir, nv);
@ -2180,6 +2181,11 @@ dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY,
DS_IS_DEFER_DESTROY(ds) ? 1 : 0);
ratio = ds->ds_phys->ds_compressed_bytes == 0 ? 100 :
(ds->ds_phys->ds_uncompressed_bytes * 100 /
ds->ds_phys->ds_compressed_bytes);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio);
if (ds->ds_phys->ds_next_snap_obj) {
/*
* This is a snapshot; override the dd's space used with
@ -2187,10 +2193,7 @@ dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
*/
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
ds->ds_phys->ds_unique_bytes);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
ds->ds_phys->ds_compressed_bytes == 0 ? 100 :
(ds->ds_phys->ds_uncompressed_bytes * 100 /
ds->ds_phys->ds_compressed_bytes));
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio);
}
}