Possibility to physically reserve space without writing leaf blocks

   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  * Copyright (c) 2013, Joyent, Inc. All rights reserved.
  26  */
  27 
  28 #ifndef _ZFEATURE_COMMON_H
  29 #define _ZFEATURE_COMMON_H
  30 
  31 #include <sys/fs/zfs.h>
  32 #include <sys/inttypes.h>
  33 #include <sys/types.h>
  34 
  35 #ifdef  __cplusplus
  36 extern "C" {
  37 #endif
  38 
  39 struct zfeature_info;
  40 
  41 typedef enum spa_feature {
  42         SPA_FEATURE_NONE = -1,
  43         SPA_FEATURE_ASYNC_DESTROY,
  44         SPA_FEATURE_EMPTY_BPOBJ,
  45         SPA_FEATURE_LZ4_COMPRESS,
  46         SPA_FEATURE_MULTI_VDEV_CRASH_DUMP,
  47         SPA_FEATURE_SPACEMAP_HISTOGRAM,
  48         SPA_FEATURE_ENABLED_TXG,
  49         SPA_FEATURE_HOLE_BIRTH,
  50         SPA_FEATURE_EXTENSIBLE_DATASET,
  51         SPA_FEATURE_EMBEDDED_DATA,
  52         SPA_FEATURE_BOOKMARKS,
  53         SPA_FEATURE_FS_SS_LIMIT,

  54         SPA_FEATURES
  55 } spa_feature_t;
  56 
  57 #define SPA_FEATURE_DISABLED    (-1ULL)
  58 
  59 typedef struct zfeature_info {
  60         spa_feature_t fi_feature;
  61         const char *fi_uname;   /* User-facing feature name */
  62         const char *fi_guid;    /* On-disk feature identifier */
  63         const char *fi_desc;    /* Feature description */
  64         boolean_t fi_can_readonly; /* Can open pool readonly w/o support? */
  65         boolean_t fi_mos;       /* Is the feature necessary to read the MOS? */
  66         /* Activate this feature at the same time it is enabled */
  67         boolean_t fi_activate_on_enable;
  68         /* array of dependencies, terminated by SPA_FEATURE_NONE */
  69         const spa_feature_t *fi_depends;
  70 } zfeature_info_t;
  71 
  72 typedef int (zfeature_func_t)(zfeature_info_t *, void *);
  73 
  74 #define ZFS_FEATURE_DEBUG
  75 
  76 extern zfeature_info_t spa_feature_table[SPA_FEATURES];
  77 
  78 extern boolean_t zfeature_is_valid_guid(const char *);
  79 
  80 extern boolean_t zfeature_is_supported(const char *);
  81 extern int zfeature_lookup_name(const char *, spa_feature_t *);
  82 extern boolean_t zfeature_depends_on(spa_feature_t, spa_feature_t);
  83 
  84 extern void zpool_feature_init(void);
  85 
  86 #ifdef  __cplusplus
  87 }
  88 #endif
  89 
  90 #endif  /* _ZFEATURE_COMMON_H */
--- EOF ---