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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
*/
#ifdef _KERNEL
#include <sys/systm.h>
#else
#include <errno.h>
#include <string.h>
#endif
#include <sys/debug.h>
#include <sys/fs/zfs.h>
#include <sys/inttypes.h>
#include <sys/types.h>
#include "zfeature_common.h"
/*
* Set to disable all feature checks while opening pools, allowing pools with
* unsupported features to be opened. Set for testing only.
*/
boolean_t zfeature_checks_disable = B_FALSE;
zfeature_info_t spa_feature_table[SPA_FEATURES];
/*
* Valid characters for feature guids. This list is mainly for aesthetic
* purposes and could be expanded in the future. There are different allowed
* characters in the guids reverse dns portion (before the colon) and its
* short name (after the colon).
*/
static int
valid_char(char c, boolean_t after_colon)
{
return ((c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9') ||
c == (after_colon ? '_' : '.'));
}
/*
* Every feature guid must contain exactly one colon which separates a reverse
* dns organization name from the feature's "short" name (e.g.
* "com.company:feature_name").
*/
boolean_t
zfeature_is_valid_guid(const char *name)
{
int i;
boolean_t has_colon = B_FALSE;
i = 0;
while (name[i] != '\0') {
char c = name[i++];
if (c == ':') {
if (has_colon)
return (B_FALSE);
has_colon = B_TRUE;
continue;
}
if (!valid_char(c, has_colon))
return (B_FALSE);
}
return (has_colon);
}
boolean_t
zfeature_is_supported(const char *guid)
{
spa_feature_t i;
if (zfeature_checks_disable)
return (B_TRUE);
for (i = 0; i < SPA_FEATURES; i++) {
zfeature_info_t *feature = &spa_feature_table[i];
if (strcmp(guid, feature->fi_guid) == 0)
return (B_TRUE);
}
return (B_FALSE);
}
int
zfeature_lookup_name(const char *name, spa_feature_t *res)
{
spa_feature_t i;
for (i = 0; i < SPA_FEATURES; i++) {
zfeature_info_t *feature = &spa_feature_table[i];
if (strcmp(name, feature->fi_uname) == 0) {
if (res != NULL)
*res = i;
return (0);
}
}
return (ENOENT);
}
boolean_t
zfeature_depends_on(spa_feature_t fid, spa_feature_t check) {
zfeature_info_t *feature = &spa_feature_table[fid];
int i;
for (i = 0; feature->fi_depends[i] != SPA_FEATURE_NONE; i++) {
if (feature->fi_depends[i] == check)
return (B_TRUE);
}
return (B_FALSE);
}
static void
zfeature_register(spa_feature_t fid, const char *guid, const char *name,
const char *desc, boolean_t readonly, boolean_t mos,
boolean_t activate_on_enable, const spa_feature_t *deps)
{
zfeature_info_t *feature = &spa_feature_table[fid];
static spa_feature_t nodeps[] = { SPA_FEATURE_NONE };
ASSERT(name != NULL);
ASSERT(desc != NULL);
ASSERT(!readonly || !mos);
ASSERT3U(fid, <, SPA_FEATURES);
ASSERT(zfeature_is_valid_guid(guid));
if (deps == NULL)
deps = nodeps;
feature->fi_feature = fid;
feature->fi_guid = guid;
feature->fi_uname = name;
feature->fi_desc = desc;
feature->fi_can_readonly = readonly;
feature->fi_mos = mos;
feature->fi_activate_on_enable = activate_on_enable;
feature->fi_depends = deps;
}
void
zpool_feature_init(void)
{
zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
"com.delphix:async_destroy", "async_destroy",
"Destroy filesystems asynchronously.", B_TRUE, B_FALSE,
B_FALSE, NULL);
zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
"com.delphix:empty_bpobj", "empty_bpobj",
"Snapshots use less space.", B_TRUE, B_FALSE,
B_FALSE, NULL);
zfeature_register(SPA_FEATURE_LZ4_COMPRESS,
"org.illumos:lz4_compress", "lz4_compress",
"LZ4 compression algorithm support.", B_FALSE, B_FALSE,
B_FALSE, NULL);
zfeature_register(SPA_FEATURE_SPACEMAP_HISTOGRAM,
"com.delphix:spacemap_histogram", "spacemap_histogram",
"Spacemaps maintain space histograms.", B_TRUE, B_FALSE,
B_FALSE, NULL);
zfeature_register(SPA_FEATURE_ENABLED_TXG,
"com.delphix:enabled_txg", "enabled_txg",
"Record txg at which a feature is enabled", B_TRUE, B_FALSE,
B_FALSE, NULL);
{
static const spa_feature_t hole_birth_deps[] = {
SPA_FEATURE_ENABLED_TXG,
SPA_FEATURE_NONE
};
zfeature_register(SPA_FEATURE_HOLE_BIRTH,
"com.delphix:hole_birth", "hole_birth",
"Retain hole birth txg for more precise zfs send",
B_FALSE, B_TRUE, B_TRUE, hole_birth_deps);
}
zfeature_register(SPA_FEATURE_EXTENSIBLE_DATASET,
"com.delphix:extensible_dataset", "extensible_dataset",
"Enhanced dataset functionality, used by other features.",
B_FALSE, B_FALSE, B_FALSE, NULL);
{
static const spa_feature_t bookmarks_deps[] = {
SPA_FEATURE_EXTENSIBLE_DATASET,
SPA_FEATURE_NONE
};
zfeature_register(SPA_FEATURE_BOOKMARKS,
"com.delphix:bookmarks", "bookmarks",
"\"zfs bookmark\" command",
B_TRUE, B_FALSE, B_FALSE, bookmarks_deps);
}
}
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