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) 2011, 2015 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_FEATURE_EMBEDDED_DATA,
  50         SPA_FEATURE_BOOKMARKS,
  51         SPA_FEATURE_FS_SS_LIMIT,
  52         SPA_FEATURE_LARGE_BLOCKS,
  53         SPA_FEATURE_LARGE_DNODE,
  54         SPA_FEATURES
  55 } spa_feature_t;
  56
  57 #define SPA_FEATURE_DISABLED    (-1ULL)
  58
  59 typedef enum zfeature_flags {
  60         /* Can open pool readonly even if this feature is not supported. */
  61         ZFEATURE_FLAG_READONLY_COMPAT =         (1 << 0),
  62         /* Is this feature necessary to read the MOS? */
  63         ZFEATURE_FLAG_MOS =                     (1 << 1),
  64         /* Activate this feature at the same time it is enabled. */
  65         ZFEATURE_FLAG_ACTIVATE_ON_ENABLE =      (1 << 2),
  66         /* Each dataset has a field set if it has ever used this feature. */
  67         ZFEATURE_FLAG_PER_DATASET =             (1 << 3)
  68 } zfeature_flags_t;
  69
  70 typedef struct zfeature_info {
  71         spa_feature_t fi_feature;
  72         const char *fi_uname;   /* User-facing feature name */
  73         const char *fi_guid;    /* On-disk feature identifier */
  74         const char *fi_desc;    /* Feature description */
  75         zfeature_flags_t fi_flags;
  76         /* array of dependencies, terminated by SPA_FEATURE_NONE */
  77         const spa_feature_t *fi_depends;
  78 } zfeature_info_t;
  79
  80 typedef int (zfeature_func_t)(zfeature_info_t *, void *);
  81
  82 #define ZFS_FEATURE_DEBUG
  83
  84 extern zfeature_info_t spa_feature_table[SPA_FEATURES];
  85
  86 extern boolean_t zfeature_is_valid_guid(const char *);
  87
  88 extern boolean_t zfeature_is_supported(const char *);
  89 extern int zfeature_lookup_name(const char *, spa_feature_t *);
  90 extern boolean_t zfeature_depends_on(spa_feature_t, spa_feature_t);
  91
  92 extern void zpool_feature_init(void);
  93
  94 #ifdef  __cplusplus
  95 }
  96 #endif
  97
  98 #endif  /* _ZFEATURE_COMMON_H */