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753c38392d
3104 eliminate empty bpobjs Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Christopher Siden <chris.siden@delphix.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Approved by: Eric Schrock <eric.schrock@delphix.com> References: illumos/illumos-gate@f174573681 illumos changeset: 13782:8f78aae28a63 https://www.illumos.org/issues/3104 Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
164 lines
3.9 KiB
C
164 lines
3.9 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2012 by Delphix. All rights reserved.
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*/
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#ifdef _KERNEL
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#include <sys/systm.h>
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#else
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#include <errno.h>
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#include <string.h>
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#endif
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#include <sys/debug.h>
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#include <sys/fs/zfs.h>
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#include <sys/inttypes.h>
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#include <sys/types.h>
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#include "zfeature_common.h"
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/*
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* Set to disable all feature checks while opening pools, allowing pools with
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* unsupported features to be opened. Set for testing only.
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*/
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boolean_t zfeature_checks_disable = B_FALSE;
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zfeature_info_t spa_feature_table[SPA_FEATURES];
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/*
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* Valid characters for feature guids. This list is mainly for aesthetic
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* purposes and could be expanded in the future. There are different allowed
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* characters in the guids reverse dns portion (before the colon) and its
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* short name (after the colon).
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*/
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static int
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valid_char(char c, boolean_t after_colon)
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{
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return ((c >= 'a' && c <= 'z') ||
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(c >= '0' && c <= '9') ||
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c == (after_colon ? '_' : '.'));
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}
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/*
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* Every feature guid must contain exactly one colon which separates a reverse
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* dns organization name from the feature's "short" name (e.g.
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* "com.company:feature_name").
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*/
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boolean_t
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zfeature_is_valid_guid(const char *name)
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{
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int i;
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boolean_t has_colon = B_FALSE;
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i = 0;
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while (name[i] != '\0') {
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char c = name[i++];
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if (c == ':') {
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if (has_colon)
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return (B_FALSE);
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has_colon = B_TRUE;
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continue;
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}
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if (!valid_char(c, has_colon))
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return (B_FALSE);
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}
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return (has_colon);
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}
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boolean_t
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zfeature_is_supported(const char *guid)
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{
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if (zfeature_checks_disable)
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return (B_TRUE);
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return (0 == zfeature_lookup_guid(guid, NULL));
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}
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int
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zfeature_lookup_guid(const char *guid, zfeature_info_t **res)
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{
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int i;
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for (i = 0; i < SPA_FEATURES; i++) {
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zfeature_info_t *feature = &spa_feature_table[i];
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if (strcmp(guid, feature->fi_guid) == 0) {
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if (res != NULL)
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*res = feature;
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return (0);
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}
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}
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return (ENOENT);
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}
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int
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zfeature_lookup_name(const char *name, zfeature_info_t **res)
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{
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int i;
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for (i = 0; i < SPA_FEATURES; i++) {
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zfeature_info_t *feature = &spa_feature_table[i];
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if (strcmp(name, feature->fi_uname) == 0) {
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if (res != NULL)
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*res = feature;
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return (0);
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}
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}
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return (ENOENT);
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}
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static void
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zfeature_register(int fid, const char *guid, const char *name, const char *desc,
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boolean_t readonly, boolean_t mos, zfeature_info_t **deps)
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{
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zfeature_info_t *feature = &spa_feature_table[fid];
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static zfeature_info_t *nodeps[] = { NULL };
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ASSERT(name != NULL);
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ASSERT(desc != NULL);
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ASSERT(!readonly || !mos);
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ASSERT3U(fid, <, SPA_FEATURES);
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ASSERT(zfeature_is_valid_guid(guid));
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if (deps == NULL)
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deps = nodeps;
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feature->fi_guid = guid;
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feature->fi_uname = name;
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feature->fi_desc = desc;
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feature->fi_can_readonly = readonly;
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feature->fi_mos = mos;
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feature->fi_depends = deps;
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}
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void
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zpool_feature_init(void)
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{
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zfeature_register(SPA_FEATURE_ASYNC_DESTROY,
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"com.delphix:async_destroy", "async_destroy",
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"Destroy filesystems asynchronously.", B_TRUE, B_FALSE, NULL);
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zfeature_register(SPA_FEATURE_EMPTY_BPOBJ,
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"com.delphix:empty_bpobj", "empty_bpobj",
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"Snapshots use less space.", B_TRUE, B_FALSE, NULL);
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}
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