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MFV r336944: 9286 want refreservation=auto

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When a ZFS volume is created with zfs create -V (but without -s), the
refreservation property is set to a value that is volsize plus the maximum
size of metadata. If refreservation is ever set to another value, it is
impossible to set it back to the automatically determined value. There are
other cases where refreservation may be wrong. These include receiving a
volume that was sent without properties and zfs clone.

We need:

zfs set refreservation=auto <volume>
zfs clone -o refreservation=auto <volume>

Each one would use the same function used by zfs create -V to determine the
proper value for refreservation.

illumos/illumos-gate@1c10ae76c0

Reviewed by: Allan Jude <allanjude@freebsd.org>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: Andy Stormont <astormont@racktopsystems.com>
Approved by: Richard Lowe <richlowe@richlowe.net>
Author: Mike Gerdts <mike.gerdts@joyent.com>
This commit is contained in:
Alexander Motin 2018-07-30 22:39:30 +00:00
commit 1960706625
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=336945
3 changed files with 141 additions and 10 deletions
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38
cddl/contrib/opensolaris/cmd/zfs/zfs.8
View File

@ -28,6 +28,7 @@
.\" Copyright (c) 2016 Nexenta Systems, Inc. All Rights Reserved.
.\" Copyright (c) 2014, Xin LI <delphij@FreeBSD.org>
.\" Copyright (c) 2014-2015, The FreeBSD Foundation, All Rights Reserved.
.\" Copyright 2018 Joyent, Inc.
.\"
.\" $FreeBSD$
.\"
@ -1311,7 +1312,7 @@ The default value is
Limits the amount of space a dataset can consume. This property enforces a hard
limit on the amount of space used. This hard limit does not include space used
by descendents, including file systems and snapshots.
.It Sy refreservation Ns = Ns Ar size | Cm none
.It Sy refreservation Ns = Ns Ar size | Cm none | Cm auto
The minimum amount of space guaranteed to a dataset, not including its
descendents. When the amount of space used is below this value, the dataset is
treated as if it were taking up the amount of space specified by
@ -1327,6 +1328,18 @@ is set, a snapshot is only allowed if there is enough free pool space outside
of this reservation to accommodate the current number of "referenced" bytes in
the dataset.
.Pp
If
.Sy refreservation
is set to
.Sy auto ,
a volume is thick provisioned or not sparse.
.Sy refreservation Ns = Cm auto
is only supported on volumes.
See
.Sy volsize
in the Native Properties
section for more information about sparse volumes.
.Pp
This property can also be referred to by its shortened column name,
.Sy refreserv .
.It Sy reservation Ns = Ns Ar size | Cm none
@ -1459,18 +1472,33 @@ on how the volume is used. These effects can also occur when the volume size is
changed while it is in use (particularly when shrinking the size). Extreme care
should be used when adjusting the volume size.
.Pp
Though not recommended, a "sparse volume" (also known as "thin provisioning")
Though not recommended, a "sparse volume" (also known as "thin provisioned")
can be created by specifying the
.Fl s
option to the
.Qq Nm Cm create Fl V
command, or by changing the reservation after the volume has been created. A
"sparse volume" is a volume where the reservation is less then the volume size.
command, or by changing the value of the
.Sy refreservation
property, or
.Sy reservation
property on pool version 8 or earlier
.Pc
after the volume has been created.
A "sparse volume" is a volume where the value of
.Sy refreservation
is less then the size of the volume plus the space required to store its
metadata.
Consequently, writes to a sparse volume can fail with
.Sy ENOSPC
when the pool is low on space. For a sparse volume, changes to
.Sy volsize
are not reflected in the reservation.
are not reflected in the
.Sy refreservation .
A volume that is not sparse is said to be "thick provisioned".
A sparse volume can become thick provisioned by setting
.Sy refreservation
to
.Sy auto .
.It Sy volmode Ns = Ns Cm default | geom | dev | none
This property specifies how volumes should be exposed to the OS.
Setting it to

80
cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c
View File

@ -21,7 +21,7 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013, Joyent, Inc. All rights reserved.
* Copyright (c) 2018, Joyent, Inc. All rights reserved.
* Copyright (c) 2011, 2016 by Delphix. All rights reserved.
* Copyright (c) 2012 DEY Storage Systems, Inc. All rights reserved.
* Copyright (c) 2011-2012 Pawel Jakub Dawidek. All rights reserved.
@ -1407,7 +1407,6 @@ zfs_valid_proplist(libzfs_handle_t *hdl, zfs_type_t type, nvlist_t *nvl,
switch (prop) {
case ZFS_PROP_RESERVATION:
case ZFS_PROP_REFRESERVATION:
if (intval > volsize) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"'%s' is greater than current "
@ -1418,6 +1417,17 @@ zfs_valid_proplist(libzfs_handle_t *hdl, zfs_type_t type, nvlist_t *nvl,
}
break;
case ZFS_PROP_REFRESERVATION:
if (intval > volsize && intval != UINT64_MAX) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"'%s' is greater than current "
"volume size"), propname);
(void) zfs_error(hdl, EZFS_BADPROP,
errbuf);
goto error;
}
break;
case ZFS_PROP_VOLSIZE:
if (intval % blocksize != 0) {
zfs_nicenum(blocksize, buf,
@ -1519,6 +1529,61 @@ zfs_add_synthetic_resv(zfs_handle_t *zhp, nvlist_t *nvl)
return (1);
}
/*
* Helper for 'zfs {set|clone} refreservation=auto'. Must be called after
* zfs_valid_proplist(), as it is what sets the UINT64_MAX sentinal value.
* Return codes must match zfs_add_synthetic_resv().
*/
static int
zfs_fix_auto_resv(zfs_handle_t *zhp, nvlist_t *nvl)
{
uint64_t volsize;
uint64_t resvsize;
zfs_prop_t prop;
nvlist_t *props;
if (!ZFS_IS_VOLUME(zhp)) {
return (0);
}
if (zfs_which_resv_prop(zhp, &prop) != 0) {
return (-1);
}
if (prop != ZFS_PROP_REFRESERVATION) {
return (0);
}
if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(prop), &resvsize) != 0) {
/* No value being set, so it can't be "auto" */
return (0);
}
if (resvsize != UINT64_MAX) {
/* Being set to a value other than "auto" */
return (0);
}
props = fnvlist_alloc();
fnvlist_add_uint64(props, zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
zfs_prop_get_int(zhp, ZFS_PROP_VOLBLOCKSIZE));
if (nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_VOLSIZE),
&volsize) != 0) {
volsize = zfs_prop_get_int(zhp, ZFS_PROP_VOLSIZE);
}
resvsize = zvol_volsize_to_reservation(volsize, props);
fnvlist_free(props);
(void) nvlist_remove_all(nvl, zfs_prop_to_name(prop));
if (nvlist_add_uint64(nvl, zfs_prop_to_name(prop), resvsize) != 0) {
(void) no_memory(zhp->zfs_hdl);
return (-1);
}
return (1);
}
void
zfs_setprop_error(libzfs_handle_t *hdl, zfs_prop_t prop, int err,
char *errbuf)
@ -1685,6 +1750,12 @@ zfs_prop_set_list(zfs_handle_t *zhp, nvlist_t *props)
goto error;
}
}
if (added_resv != 1 &&
(added_resv = zfs_fix_auto_resv(zhp, nvl)) == -1) {
goto error;
}
/*
* Check how many properties we're setting and allocate an array to
* store changelist pointers for postfix().
@ -3715,6 +3786,7 @@ zfs_clone(zfs_handle_t *zhp, const char *target, nvlist_t *props)
if (props) {
zfs_type_t type;
if (ZFS_IS_VOLUME(zhp)) {
type = ZFS_TYPE_VOLUME;
} else {
@ -3723,6 +3795,10 @@ zfs_clone(zfs_handle_t *zhp, const char *target, nvlist_t *props)
if ((props = zfs_valid_proplist(hdl, type, props, zoned,
zhp, zhp->zpool_hdl, errbuf)) == NULL)
return (-1);
if (zfs_fix_auto_resv(zhp, props) == -1) {
nvlist_free(props);
return (-1);
}
}
ret = lzc_clone(target, zhp->zfs_name, props);

33
cddl/contrib/opensolaris/lib/libzfs/common/libzfs_util.c
View File

@ -21,7 +21,7 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2013, Joyent, Inc. All rights reserved.
* Copyright (c) 2018 Joyent, Inc.
* Copyright (c) 2011, 2017 by Delphix. All rights reserved.
* Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
* Copyright (c) 2017 Datto Inc.
@ -1227,6 +1227,7 @@ zprop_parse_value(libzfs_handle_t *hdl, nvpair_t *elem, int prop,
const char *propname;
char *value;
boolean_t isnone = B_FALSE;
boolean_t isauto = B_FALSE;
if (type == ZFS_TYPE_POOL) {
proptype = zpool_prop_get_type(prop);
@ -1262,8 +1263,9 @@ zprop_parse_value(libzfs_handle_t *hdl, nvpair_t *elem, int prop,
(void) nvpair_value_string(elem, &value);
if (strcmp(value, "none") == 0) {
isnone = B_TRUE;
} else if (zfs_nicestrtonum(hdl, value, ivalp)
!= 0) {
} else if (strcmp(value, "auto") == 0) {
isauto = B_TRUE;
} else if (zfs_nicestrtonum(hdl, value, ivalp) != 0) {
goto error;
}
} else if (datatype == DATA_TYPE_UINT64) {
@ -1293,6 +1295,31 @@ zprop_parse_value(libzfs_handle_t *hdl, nvpair_t *elem, int prop,
prop == ZFS_PROP_SNAPSHOT_LIMIT)) {
*ivalp = UINT64_MAX;
}
/*
* Special handling for setting 'refreservation' to 'auto'. Use
* UINT64_MAX to tell the caller to use zfs_fix_auto_resv().
* 'auto' is only allowed on volumes.
*/
if (isauto) {
switch (prop) {
case ZFS_PROP_REFRESERVATION:
if ((type & ZFS_TYPE_VOLUME) == 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"'%s=auto' only allowed on "
"volumes"), nvpair_name(elem));
goto error;
}
*ivalp = UINT64_MAX;
break;
default:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"'auto' is invalid value for '%s'"),
nvpair_name(elem));
goto error;
}
}
break;
case PROP_TYPE_INDEX: