sys/vfs/hammer/hammer_ioctl.h

   1 /*
   2  * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/vfs/hammer/hammer_ioctl.h,v 1.17 2008/07/07 00:24:31 dillon Exp $
  35  */
  36 /*
  37  * HAMMER ioctl's.  This file can be #included from userland
  38  */
  39
  40 #ifndef VFS_HAMMER_IOCTL_H_
  41 #define VFS_HAMMER_IOCTL_H_
  42
  43 #include <sys/types.h>
  44 #include <sys/ioccom.h>
  45 #include "hammer_disk.h"
  46
  47 /*
  48  * Common HAMMER ioctl header
  49  *
  50  * Global flags are stored in the upper 16 bits.
  51  */
  52 struct hammer_ioc_head {
  53         int32_t         flags;
  54         int32_t         reserved01;
  55         int32_t         reserved02[4];
  56 };
  57
  58 #define HAMMER_IOC_HEAD_INTR    0x00010000
  59 #define HAMMER_IOC_DO_BTREE     0x00020000      /* reblocker */
  60 #define HAMMER_IOC_DO_INODES    0x00040000      /* reblocker */
  61 #define HAMMER_IOC_DO_DATA      0x00080000      /* reblocker */
  62 #define HAMMER_IOC_DO_DIRS      0x00100000      /* reblocker */
  63
  64 #define HAMMER_IOC_DO_FLAGS     (HAMMER_IOC_DO_BTREE |  \
  65                                  HAMMER_IOC_DO_INODES | \
  66                                  HAMMER_IOC_DO_DATA |   \
  67                                  HAMMER_IOC_DO_DIRS)
  68
  69 /*
  70  * HAMMERIOC_PRUNE
  71  *
  72  * beg/end TID ranges in the element array must be sorted in descending
  73  * order, with the most recent (highest) range at elms[0].
  74  */
  75 struct hammer_ioc_prune_elm {
  76         hammer_tid_t    beg_tid;        /* starting tid */
  77         hammer_tid_t    end_tid;        /* ending tid (non inclusive) */
  78         hammer_tid_t    mod_tid;        /* modulo */
  79 };
  80
  81 #define HAMMER_MAX_PRUNE_ELMS   (1024*1024/24)
  82
  83 struct hammer_ioc_prune {
  84         struct hammer_ioc_head head;
  85         int             nelms;
  86         int             reserved01;
  87
  88         struct hammer_base_elm key_beg; /* stop forward scan (reverse scan) */
  89         struct hammer_base_elm key_end; /* start forward scan (reverse scan) */
  90         struct hammer_base_elm key_cur; /* scan interruption point */
  91
  92         int64_t         stat_scanrecords;/* number of records scanned */
  93         int64_t         stat_rawrecords; /* number of raw records pruned */
  94         int64_t         stat_dirrecords; /* number of dir records pruned */
  95         int64_t         stat_bytes;      /* number of data bytes pruned */
  96         int64_t         stat_realignments; /* number of raw records realigned */
  97         hammer_tid_t    stat_oldest_tid; /* oldest create_tid encountered */
  98         int64_t         reserved02[6];
  99         struct hammer_ioc_prune_elm *elms; /* user supplied array */
 100 };
 101
 102 #define HAMMER_IOC_PRUNE_ALL    0x0001
 103
 104
 105 /*
 106  * HAMMERIOC_GETHISTORY
 107  *
 108  * Retrieve an array of ordered transaction ids >= beg and < end indicating
 109  * all changes made to the specified object's inode up to the
 110  * maximum.
 111  *
 112  * If ATKEY is set the key field indicates a particular key within the
 113  * inode to retrieve the history for.
 114  *
 115  * On return count is set to the number of elements returned, nxt_tid is
 116  * set to the tid the caller should store in beg_tid to continue the
 117  * iteration, and nxt_key is set to the nearest key boundary > key
 118  * indicating the range key - nxt_key (nxt_key non-inclusive) the tid
 119  * array represents.  Also obj_id is set to the object's inode number.
 120  *
 121  * nxt_key can be used to iterate the contents of a single file but should
 122  * not be stored in key until all modifications at key have been retrieved.
 123  * To work properly nxt_key should be initialized to HAMMER_MAX_KEY.
 124  * Successive ioctl() calls will reduce nxt_key as appropriate so at the
 125  * end of your iterating for 'key', key to nxt_key will represent the
 126  * shortest range of keys that all returned TIDs apply to.
 127  */
 128
 129 #define HAMMER_MAX_HISTORY_ELMS 64
 130
 131 typedef struct hammer_ioc_hist_entry {
 132         hammer_tid_t    tid;
 133         u_int32_t       time32;
 134         u_int32_t       unused;
 135 } *hammer_ioc_hist_entry_t;
 136
 137 struct hammer_ioc_history {
 138         struct hammer_ioc_head head;
 139         int64_t         obj_id;
 140         hammer_tid_t    beg_tid;
 141         hammer_tid_t    nxt_tid;
 142         hammer_tid_t    end_tid;
 143         int64_t         key;
 144         int64_t         nxt_key;
 145         int             count;
 146         int             reserve01;
 147         struct hammer_ioc_hist_entry hist_ary[HAMMER_MAX_HISTORY_ELMS];
 148 };
 149
 150 #define HAMMER_IOC_HISTORY_ATKEY        0x0001
 151 #define HAMMER_IOC_HISTORY_NEXT_TID     0x0002  /* iterate via nxt_tid */
 152 #define HAMMER_IOC_HISTORY_NEXT_KEY     0x0004  /* iterate via nxt_key */
 153 #define HAMMER_IOC_HISTORY_EOF          0x0008  /* no more keys */
 154 #define HAMMER_IOC_HISTORY_UNSYNCED     0x0010  /* unsynced info in inode */
 155
 156 /*
 157  * Reblock request
 158  */
 159 struct hammer_ioc_reblock {
 160         struct hammer_ioc_head head;
 161         int32_t         free_level;             /* 0 for maximum compaction */
 162         u_int32_t       reserved01;
 163
 164         struct hammer_base_elm key_beg;         /* start forward scan */
 165         struct hammer_base_elm key_end;         /* stop forward scan */
 166         struct hammer_base_elm key_cur;         /* scan interruption point */
 167
 168         int64_t         btree_count;            /* B-Tree nodes checked */
 169         int64_t         record_count;           /* Records checked */
 170         int64_t         data_count;             /* Data segments checked */
 171         int64_t         data_byte_count;        /* Data bytes checked */
 172
 173         int64_t         btree_moves;            /* B-Tree nodes moved */
 174         int64_t         record_moves;           /* Records moved */
 175         int64_t         data_moves;             /* Data segments moved */
 176         int64_t         data_byte_moves;        /* Data bytes moved */
 177
 178         int32_t         unused02;
 179         int32_t         unused03;
 180 };
 181
 182 /*
 183  * HAMMERIOC_SYNCTID
 184  */
 185 enum hammer_synctid_op {
 186         HAMMER_SYNCTID_NONE,    /* no sync (TID will not be accurate) */
 187         HAMMER_SYNCTID_ASYNC,   /* async (TID will not be accurate) */
 188         HAMMER_SYNCTID_SYNC1,   /* single sync - might undo after crash */
 189         HAMMER_SYNCTID_SYNC2    /* double sync - guarantee no undo */
 190 };
 191
 192 struct hammer_ioc_synctid {
 193         struct hammer_ioc_head  head;
 194         enum hammer_synctid_op  op;
 195         hammer_tid_t            tid;
 196 };
 197
 198 /*
 199  * HAMMERIOC_GET_PSEUDOFS
 200  * HAMMERIOC_SET_PSEUDOFS
 201  */
 202 struct hammer_ioc_pseudofs_rw {
 203         struct hammer_ioc_head  head;
 204         u_int32_t               pseudoid;
 205         u_int32_t               bytes;
 206         u_int32_t               version;
 207         u_int32_t               flags;
 208         struct hammer_pseudofs_data *ondisk;
 209 };
 210
 211 #define HAMMER_IOC_PSEUDOFS_VERSION     1
 212
 213 #define HAMMER_IOC_PFS_SYNC_BEG         0x0001
 214 #define HAMMER_IOC_PFS_SYNC_END         0x0002
 215 #define HAMMER_IOC_PFS_SHARED_UUID      0x0004
 216 #define HAMMER_IOC_PFS_MIRROR_UUID      0x0008
 217 #define HAMMER_IOC_PFS_MASTER_ID        0x0010
 218 #define HAMMER_IOC_PFS_MIRROR_FLAGS     0x0020
 219 #define HAMMER_IOC_PFS_LABEL            0x0040
 220
 221 /*
 222  * HAMMERIOC_MIRROR_READ/WRITE
 223  */
 224 struct hammer_ioc_mirror_rw {
 225         struct hammer_ioc_head  head;
 226         struct hammer_base_elm  key_beg;        /* start forward scan */
 227         struct hammer_base_elm  key_end;        /* stop forward scan */
 228         struct hammer_base_elm  key_cur;        /* interruption point */
 229         hammer_tid_t            tid_beg;        /* filter modification range */
 230         hammer_tid_t            tid_end;        /* filter modification range */
 231         void                    *ubuf;          /* user buffer */
 232         int                     count;          /* current size */
 233         int                     size;           /* max size */
 234 };
 235
 236 /*
 237  * NOTE: crc is for the data block starting at rec_size, not including the
 238  * data[] array.
 239  */
 240 typedef struct hammer_ioc_mrecord {
 241         u_int32_t               signature;      /* signature for byte order */
 242         u_int32_t               rec_crc;
 243         u_int32_t               rec_size;
 244         u_int32_t               type;
 245         struct hammer_btree_leaf_elm leaf;
 246         /* extended by data */
 247 } *hammer_ioc_mrecord_t;
 248
 249 #define HAMMER_MREC_TYPE_RESERVED       0
 250 #define HAMMER_MREC_TYPE_REC            1
 251 #define HAMMER_MREC_TYPE_PFSD           2
 252 #define HAMMER_MREC_TYPE_UPDATE         3
 253 #define HAMMER_MREC_TYPE_SYNC           4
 254
 255 #define HAMMER_MREC_CRCOFF      (offsetof(struct hammer_ioc_mrecord, rec_size))
 256 #define HAMMER_MREC_HEADSIZE    sizeof(struct hammer_ioc_mrecord)
 257
 258 #define HAMMER_IOC_MIRROR_SIGNATURE     0x4dd97272U
 259 #define HAMMER_IOC_MIRROR_SIGNATURE_REV 0x7272d94dU
 260
 261 /*
 262  * Ioctl cmd ids
 263  */
 264
 265 #define HAMMERIOC_PRUNE         _IOWR('h',1,struct hammer_ioc_prune)
 266 #define HAMMERIOC_GETHISTORY    _IOWR('h',2,struct hammer_ioc_history)
 267 #define HAMMERIOC_REBLOCK       _IOWR('h',3,struct hammer_ioc_reblock)
 268 #define HAMMERIOC_SYNCTID       _IOWR('h',4,struct hammer_ioc_synctid)
 269 #define HAMMERIOC_SET_PSEUDOFS  _IOWR('h',5,struct hammer_ioc_pseudofs_rw)
 270 #define HAMMERIOC_GET_PSEUDOFS  _IOWR('h',6,struct hammer_ioc_pseudofs_rw)
 271 #define HAMMERIOC_MIRROR_READ   _IOWR('h',7,struct hammer_ioc_mirror_rw)
 272 #define HAMMERIOC_MIRROR_WRITE  _IOWR('h',8,struct hammer_ioc_mirror_rw)
 273
 274 #endif
 275