linux/fs/ocfs2/ocfs2_ioctl.h
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   1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * ocfs2_ioctl.h
   5 *
   6 * Defines OCFS2 ioctls.
   7 *
   8 * Copyright (C) 2010 Oracle.  All rights reserved.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public
  12 * License, version 2, as published by the Free Software Foundation.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17 * General Public License for more details.
  18 */
  19
  20#ifndef OCFS2_IOCTL_H
  21#define OCFS2_IOCTL_H
  22
  23/*
  24 * ioctl commands
  25 */
  26#define OCFS2_IOC_GETFLAGS      FS_IOC_GETFLAGS
  27#define OCFS2_IOC_SETFLAGS      FS_IOC_SETFLAGS
  28#define OCFS2_IOC32_GETFLAGS    FS_IOC32_GETFLAGS
  29#define OCFS2_IOC32_SETFLAGS    FS_IOC32_SETFLAGS
  30
  31/*
  32 * Space reservation / allocation / free ioctls and argument structure
  33 * are designed to be compatible with XFS.
  34 *
  35 * ALLOCSP* and FREESP* are not and will never be supported, but are
  36 * included here for completeness.
  37 */
  38struct ocfs2_space_resv {
  39        __s16           l_type;
  40        __s16           l_whence;
  41        __s64           l_start;
  42        __s64           l_len;          /* len == 0 means until end of file */
  43        __s32           l_sysid;
  44        __u32           l_pid;
  45        __s32           l_pad[4];       /* reserve area                     */
  46};
  47
  48#define OCFS2_IOC_ALLOCSP               _IOW ('X', 10, struct ocfs2_space_resv)
  49#define OCFS2_IOC_FREESP                _IOW ('X', 11, struct ocfs2_space_resv)
  50#define OCFS2_IOC_RESVSP                _IOW ('X', 40, struct ocfs2_space_resv)
  51#define OCFS2_IOC_UNRESVSP      _IOW ('X', 41, struct ocfs2_space_resv)
  52#define OCFS2_IOC_ALLOCSP64     _IOW ('X', 36, struct ocfs2_space_resv)
  53#define OCFS2_IOC_FREESP64      _IOW ('X', 37, struct ocfs2_space_resv)
  54#define OCFS2_IOC_RESVSP64      _IOW ('X', 42, struct ocfs2_space_resv)
  55#define OCFS2_IOC_UNRESVSP64    _IOW ('X', 43, struct ocfs2_space_resv)
  56
  57/* Used to pass group descriptor data when online resize is done */
  58struct ocfs2_new_group_input {
  59        __u64 group;            /* Group descriptor's blkno. */
  60        __u32 clusters;         /* Total number of clusters in this group */
  61        __u32 frees;            /* Total free clusters in this group */
  62        __u16 chain;            /* Chain for this group */
  63        __u16 reserved1;
  64        __u32 reserved2;
  65};
  66
  67#define OCFS2_IOC_GROUP_EXTEND  _IOW('o', 1, int)
  68#define OCFS2_IOC_GROUP_ADD     _IOW('o', 2,struct ocfs2_new_group_input)
  69#define OCFS2_IOC_GROUP_ADD64   _IOW('o', 3,struct ocfs2_new_group_input)
  70
  71/* Used to pass 2 file names to reflink. */
  72struct reflink_arguments {
  73        __u64 old_path;
  74        __u64 new_path;
  75        __u64 preserve;
  76};
  77#define OCFS2_IOC_REFLINK       _IOW('o', 4, struct reflink_arguments)
  78
  79/* Following definitions dedicated for ocfs2_info_request ioctls. */
  80#define OCFS2_INFO_MAX_REQUEST          (50)
  81#define OCFS2_TEXT_UUID_LEN             (OCFS2_VOL_UUID_LEN * 2)
  82
  83/* Magic number of all requests */
  84#define OCFS2_INFO_MAGIC                (0x4F32494E)
  85
  86/*
  87 * Always try to separate info request into small pieces to
  88 * guarantee the backward&forward compatibility.
  89 */
  90struct ocfs2_info {
  91        __u64 oi_requests;      /* Array of __u64 pointers to requests */
  92        __u32 oi_count;         /* Number of requests in info_requests */
  93        __u32 oi_pad;
  94};
  95
  96struct ocfs2_info_request {
  97/*00*/  __u32 ir_magic; /* Magic number */
  98        __u32 ir_code;  /* Info request code */
  99        __u32 ir_size;  /* Size of request */
 100        __u32 ir_flags; /* Request flags */
 101/*10*/                  /* Request specific fields */
 102};
 103
 104struct ocfs2_info_clustersize {
 105        struct ocfs2_info_request ic_req;
 106        __u32 ic_clustersize;
 107        __u32 ic_pad;
 108};
 109
 110struct ocfs2_info_blocksize {
 111        struct ocfs2_info_request ib_req;
 112        __u32 ib_blocksize;
 113        __u32 ib_pad;
 114};
 115
 116struct ocfs2_info_maxslots {
 117        struct ocfs2_info_request im_req;
 118        __u32 im_max_slots;
 119        __u32 im_pad;
 120};
 121
 122struct ocfs2_info_label {
 123        struct ocfs2_info_request il_req;
 124        __u8    il_label[OCFS2_MAX_VOL_LABEL_LEN];
 125} __attribute__ ((packed));
 126
 127struct ocfs2_info_uuid {
 128        struct ocfs2_info_request iu_req;
 129        __u8    iu_uuid_str[OCFS2_TEXT_UUID_LEN + 1];
 130} __attribute__ ((packed));
 131
 132struct ocfs2_info_fs_features {
 133        struct ocfs2_info_request if_req;
 134        __u32 if_compat_features;
 135        __u32 if_incompat_features;
 136        __u32 if_ro_compat_features;
 137        __u32 if_pad;
 138};
 139
 140struct ocfs2_info_journal_size {
 141        struct ocfs2_info_request ij_req;
 142        __u64 ij_journal_size;
 143};
 144
 145struct ocfs2_info_freeinode {
 146        struct ocfs2_info_request ifi_req;
 147        struct ocfs2_info_local_freeinode {
 148                __u64 lfi_total;
 149                __u64 lfi_free;
 150        } ifi_stat[OCFS2_MAX_SLOTS];
 151        __u32 ifi_slotnum; /* out */
 152        __u32 ifi_pad;
 153};
 154
 155#define OCFS2_INFO_MAX_HIST     (32)
 156
 157struct ocfs2_info_freefrag {
 158        struct ocfs2_info_request iff_req;
 159        struct ocfs2_info_freefrag_stats { /* (out) */
 160                struct ocfs2_info_free_chunk_list {
 161                        __u32 fc_chunks[OCFS2_INFO_MAX_HIST];
 162                        __u32 fc_clusters[OCFS2_INFO_MAX_HIST];
 163                } ffs_fc_hist;
 164                __u32 ffs_clusters;
 165                __u32 ffs_free_clusters;
 166                __u32 ffs_free_chunks;
 167                __u32 ffs_free_chunks_real;
 168                __u32 ffs_min; /* Minimum free chunksize in clusters */
 169                __u32 ffs_max;
 170                __u32 ffs_avg;
 171                __u32 ffs_pad;
 172        } iff_ffs;
 173        __u32 iff_chunksize; /* chunksize in clusters(in) */
 174        __u32 iff_pad;
 175};
 176
 177/* Codes for ocfs2_info_request */
 178enum ocfs2_info_type {
 179        OCFS2_INFO_CLUSTERSIZE = 1,
 180        OCFS2_INFO_BLOCKSIZE,
 181        OCFS2_INFO_MAXSLOTS,
 182        OCFS2_INFO_LABEL,
 183        OCFS2_INFO_UUID,
 184        OCFS2_INFO_FS_FEATURES,
 185        OCFS2_INFO_JOURNAL_SIZE,
 186        OCFS2_INFO_FREEINODE,
 187        OCFS2_INFO_FREEFRAG,
 188        OCFS2_INFO_NUM_TYPES
 189};
 190
 191/* Flags for struct ocfs2_info_request */
 192/* Filled by the caller */
 193#define OCFS2_INFO_FL_NON_COHERENT      (0x00000001)    /* Cluster coherency not
 194                                                           required. This is a hint.
 195                                                           It is up to ocfs2 whether
 196                                                           the request can be fulfilled
 197                                                           without locking. */
 198/* Filled by ocfs2 */
 199#define OCFS2_INFO_FL_FILLED            (0x40000000)    /* Filesystem understood
 200                                                           this request and
 201                                                           filled in the answer */
 202
 203#define OCFS2_INFO_FL_ERROR             (0x80000000)    /* Error happened during
 204                                                           request handling. */
 205
 206#define OCFS2_IOC_INFO          _IOR('o', 5, struct ocfs2_info)
 207
 208struct ocfs2_move_extents {
 209/* All values are in bytes */
 210        /* in */
 211        __u64 me_start;         /* Virtual start in the file to move */
 212        __u64 me_len;           /* Length of the extents to be moved */
 213        __u64 me_goal;          /* Physical offset of the goal,
 214                                   it's in block unit */
 215        __u64 me_threshold;     /* Maximum distance from goal or threshold
 216                                   for auto defragmentation */
 217        __u64 me_flags;         /* Flags for the operation:
 218                                 * - auto defragmentation.
 219                                 * - refcount,xattr cases.
 220                                 */
 221        /* out */
 222        __u64 me_moved_len;     /* Moved/defraged length */
 223        __u64 me_new_offset;    /* Resulting physical location */
 224        __u32 me_reserved[2];   /* Reserved for futhure */
 225};
 226
 227#define OCFS2_MOVE_EXT_FL_AUTO_DEFRAG   (0x00000001)    /* Kernel manages to
 228                                                           claim new clusters
 229                                                           as the goal place
 230                                                           for extents moving */
 231#define OCFS2_MOVE_EXT_FL_PART_DEFRAG   (0x00000002)    /* Allow partial extent
 232                                                           moving, is to make
 233                                                           movement less likely
 234                                                           to fail, may make fs
 235                                                           even more fragmented */
 236#define OCFS2_MOVE_EXT_FL_COMPLETE      (0x00000004)    /* Move or defragmenation
 237                                                           completely gets done.
 238                                                         */
 239
 240#define OCFS2_IOC_MOVE_EXT      _IOW('o', 6, struct ocfs2_move_extents)
 241
 242#endif /* OCFS2_IOCTL_H */
 243
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