include/zfeature_common.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 2013 by Delphix. All rights reserved.
  24  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  25  */
  26
  27 #ifndef _ZFEATURE_COMMON_H
  28 #define _ZFEATURE_COMMON_H
  29
  30 #include <sys/fs/zfs.h>
  31 #include <sys/inttypes.h>
  32 #include <sys/types.h>
  33
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37
  38 struct zfeature_info;
  39
  40 typedef enum spa_feature {
  41         SPA_FEATURE_NONE = -1,
  42         SPA_FEATURE_ASYNC_DESTROY,
  43         SPA_FEATURE_EMPTY_BPOBJ,
  44         SPA_FEATURE_LZ4_COMPRESS,
  45         SPA_FEATURE_SPACEMAP_HISTOGRAM,
  46         SPA_FEATURE_ENABLED_TXG,
  47         SPA_FEATURE_HOLE_BIRTH,
  48         SPA_FEATURE_EXTENSIBLE_DATASET,
  49         SPA_FEATURES
  50 } spa_feature_t;
  51
  52 #define SPA_FEATURE_DISABLED    (-1ULL)
  53
  54 typedef struct zfeature_info {
  55         spa_feature_t fi_feature;
  56         const char *fi_uname;   /* User-facing feature name */
  57         const char *fi_guid;    /* On-disk feature identifier */
  58         const char *fi_desc;    /* Feature description */
  59         boolean_t fi_can_readonly; /* Can open pool readonly w/o support? */
  60         boolean_t fi_mos;       /* Is the feature necessary to read the MOS? */
  61         /* Activate this feature at the same time it is enabled */
  62         boolean_t fi_activate_on_enable;
  63         /* array of dependencies, terminated by SPA_FEATURE_NONE */
  64         const spa_feature_t *fi_depends;
  65 } zfeature_info_t;
  66
  67 typedef int (zfeature_func_t)(zfeature_info_t *fi, void *arg);
  68
  69 #define ZFS_FEATURE_DEBUG
  70
  71 extern zfeature_info_t spa_feature_table[SPA_FEATURES];
  72
  73 extern boolean_t zfeature_is_valid_guid(const char *);
  74
  75 extern boolean_t zfeature_is_supported(const char *);
  76 extern int zfeature_lookup_name(const char *name, spa_feature_t *res);
  77 extern boolean_t zfeature_depends_on(spa_feature_t fid, spa_feature_t check);
  78
  79 extern void zpool_feature_init(void);
  80
  81 #ifdef  __cplusplus
  82 }
  83 #endif
  84
  85 #endif  /* _ZFEATURE_COMMON_H */