fs/xfs/xfs_shared.h

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * Copyright (c) 2013 Red Hat, Inc.
   4  * All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it would be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write the Free Software Foundation,
  17  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19 #ifndef __XFS_SHARED_H__
  20 #define __XFS_SHARED_H__
  21
  22 /*
  23  * Definitions shared between kernel and userspace that don't fit into any other
  24  * header file that is shared with userspace.
  25  */
  26 struct xfs_ifork;
  27 struct xfs_buf;
  28 struct xfs_buf_ops;
  29 struct xfs_mount;
  30 struct xfs_trans;
  31 struct xfs_inode;
  32
  33 /*
  34  * Buffer verifier operations are widely used, including userspace tools
  35  */
  36 extern const struct xfs_buf_ops xfs_agf_buf_ops;
  37 extern const struct xfs_buf_ops xfs_agi_buf_ops;
  38 extern const struct xfs_buf_ops xfs_agf_buf_ops;
  39 extern const struct xfs_buf_ops xfs_agfl_buf_ops;
  40 extern const struct xfs_buf_ops xfs_allocbt_buf_ops;
  41 extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops;
  42 extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops;
  43 extern const struct xfs_buf_ops xfs_bmbt_buf_ops;
  44 extern const struct xfs_buf_ops xfs_da3_node_buf_ops;
  45 extern const struct xfs_buf_ops xfs_dquot_buf_ops;
  46 extern const struct xfs_buf_ops xfs_symlink_buf_ops;
  47 extern const struct xfs_buf_ops xfs_agi_buf_ops;
  48 extern const struct xfs_buf_ops xfs_inobt_buf_ops;
  49 extern const struct xfs_buf_ops xfs_inode_buf_ops;
  50 extern const struct xfs_buf_ops xfs_inode_buf_ra_ops;
  51 extern const struct xfs_buf_ops xfs_dquot_buf_ops;
  52 extern const struct xfs_buf_ops xfs_sb_buf_ops;
  53 extern const struct xfs_buf_ops xfs_sb_quiet_buf_ops;
  54 extern const struct xfs_buf_ops xfs_symlink_buf_ops;
  55
  56 /*
  57  * Transaction types.  Used to distinguish types of buffers. These never reach
  58  * the log.
  59  */
  60 #define XFS_TRANS_SETATTR_NOT_SIZE      1
  61 #define XFS_TRANS_SETATTR_SIZE          2
  62 #define XFS_TRANS_INACTIVE              3
  63 #define XFS_TRANS_CREATE                4
  64 #define XFS_TRANS_CREATE_TRUNC          5
  65 #define XFS_TRANS_TRUNCATE_FILE         6
  66 #define XFS_TRANS_REMOVE                7
  67 #define XFS_TRANS_LINK                  8
  68 #define XFS_TRANS_RENAME                9
  69 #define XFS_TRANS_MKDIR                 10
  70 #define XFS_TRANS_RMDIR                 11
  71 #define XFS_TRANS_SYMLINK               12
  72 #define XFS_TRANS_SET_DMATTRS           13
  73 #define XFS_TRANS_GROWFS                14
  74 #define XFS_TRANS_STRAT_WRITE           15
  75 #define XFS_TRANS_DIOSTRAT              16
  76 /* 17 was XFS_TRANS_WRITE_SYNC */
  77 #define XFS_TRANS_WRITEID               18
  78 #define XFS_TRANS_ADDAFORK              19
  79 #define XFS_TRANS_ATTRINVAL             20
  80 #define XFS_TRANS_ATRUNCATE             21
  81 #define XFS_TRANS_ATTR_SET              22
  82 #define XFS_TRANS_ATTR_RM               23
  83 #define XFS_TRANS_ATTR_FLAG             24
  84 #define XFS_TRANS_CLEAR_AGI_BUCKET      25
  85 #define XFS_TRANS_QM_SBCHANGE           26
  86 /*
  87  * Dummy entries since we use the transaction type to index into the
  88  * trans_type[] in xlog_recover_print_trans_head()
  89  */
  90 #define XFS_TRANS_DUMMY1                27
  91 #define XFS_TRANS_DUMMY2                28
  92 #define XFS_TRANS_QM_QUOTAOFF           29
  93 #define XFS_TRANS_QM_DQALLOC            30
  94 #define XFS_TRANS_QM_SETQLIM            31
  95 #define XFS_TRANS_QM_DQCLUSTER          32
  96 #define XFS_TRANS_QM_QINOCREATE         33
  97 #define XFS_TRANS_QM_QUOTAOFF_END       34
  98 #define XFS_TRANS_SB_UNIT               35
  99 #define XFS_TRANS_FSYNC_TS              36
 100 #define XFS_TRANS_GROWFSRT_ALLOC        37
 101 #define XFS_TRANS_GROWFSRT_ZERO         38
 102 #define XFS_TRANS_GROWFSRT_FREE         39
 103 #define XFS_TRANS_SWAPEXT               40
 104 #define XFS_TRANS_SB_COUNT              41
 105 #define XFS_TRANS_CHECKPOINT            42
 106 #define XFS_TRANS_ICREATE               43
 107 #define XFS_TRANS_TYPE_MAX              43
 108 /* new transaction types need to be reflected in xfs_logprint(8) */
 109
 110 #define XFS_TRANS_TYPES \
 111         { XFS_TRANS_SETATTR_NOT_SIZE,   "SETATTR_NOT_SIZE" }, \
 112         { XFS_TRANS_SETATTR_SIZE,       "SETATTR_SIZE" }, \
 113         { XFS_TRANS_INACTIVE,           "INACTIVE" }, \
 114         { XFS_TRANS_CREATE,             "CREATE" }, \
 115         { XFS_TRANS_CREATE_TRUNC,       "CREATE_TRUNC" }, \
 116         { XFS_TRANS_TRUNCATE_FILE,      "TRUNCATE_FILE" }, \
 117         { XFS_TRANS_REMOVE,             "REMOVE" }, \
 118         { XFS_TRANS_LINK,               "LINK" }, \
 119         { XFS_TRANS_RENAME,             "RENAME" }, \
 120         { XFS_TRANS_MKDIR,              "MKDIR" }, \
 121         { XFS_TRANS_RMDIR,              "RMDIR" }, \
 122         { XFS_TRANS_SYMLINK,            "SYMLINK" }, \
 123         { XFS_TRANS_SET_DMATTRS,        "SET_DMATTRS" }, \
 124         { XFS_TRANS_GROWFS,             "GROWFS" }, \
 125         { XFS_TRANS_STRAT_WRITE,        "STRAT_WRITE" }, \
 126         { XFS_TRANS_DIOSTRAT,           "DIOSTRAT" }, \
 127         { XFS_TRANS_WRITEID,            "WRITEID" }, \
 128         { XFS_TRANS_ADDAFORK,           "ADDAFORK" }, \
 129         { XFS_TRANS_ATTRINVAL,          "ATTRINVAL" }, \
 130         { XFS_TRANS_ATRUNCATE,          "ATRUNCATE" }, \
 131         { XFS_TRANS_ATTR_SET,           "ATTR_SET" }, \
 132         { XFS_TRANS_ATTR_RM,            "ATTR_RM" }, \
 133         { XFS_TRANS_ATTR_FLAG,          "ATTR_FLAG" }, \
 134         { XFS_TRANS_CLEAR_AGI_BUCKET,   "CLEAR_AGI_BUCKET" }, \
 135         { XFS_TRANS_QM_SBCHANGE,        "QM_SBCHANGE" }, \
 136         { XFS_TRANS_QM_QUOTAOFF,        "QM_QUOTAOFF" }, \
 137         { XFS_TRANS_QM_DQALLOC,         "QM_DQALLOC" }, \
 138         { XFS_TRANS_QM_SETQLIM,         "QM_SETQLIM" }, \
 139         { XFS_TRANS_QM_DQCLUSTER,       "QM_DQCLUSTER" }, \
 140         { XFS_TRANS_QM_QINOCREATE,      "QM_QINOCREATE" }, \
 141         { XFS_TRANS_QM_QUOTAOFF_END,    "QM_QOFF_END" }, \
 142         { XFS_TRANS_SB_UNIT,            "SB_UNIT" }, \
 143         { XFS_TRANS_FSYNC_TS,           "FSYNC_TS" }, \
 144         { XFS_TRANS_GROWFSRT_ALLOC,     "GROWFSRT_ALLOC" }, \
 145         { XFS_TRANS_GROWFSRT_ZERO,      "GROWFSRT_ZERO" }, \
 146         { XFS_TRANS_GROWFSRT_FREE,      "GROWFSRT_FREE" }, \
 147         { XFS_TRANS_SWAPEXT,            "SWAPEXT" }, \
 148         { XFS_TRANS_SB_COUNT,           "SB_COUNT" }, \
 149         { XFS_TRANS_CHECKPOINT,         "CHECKPOINT" }, \
 150         { XFS_TRANS_DUMMY1,             "DUMMY1" }, \
 151         { XFS_TRANS_DUMMY2,             "DUMMY2" }, \
 152         { XLOG_UNMOUNT_REC_TYPE,        "UNMOUNT" }
 153
 154 /*
 155  * This structure is used to track log items associated with
 156  * a transaction.  It points to the log item and keeps some
 157  * flags to track the state of the log item.  It also tracks
 158  * the amount of space needed to log the item it describes
 159  * once we get to commit processing (see xfs_trans_commit()).
 160  */
 161 struct xfs_log_item_desc {
 162         struct xfs_log_item     *lid_item;
 163         struct list_head        lid_trans;
 164         unsigned char           lid_flags;
 165 };
 166
 167 #define XFS_LID_DIRTY           0x1
 168
 169 /* log size calculation functions */
 170 int     xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes);
 171 int     xfs_log_calc_minimum_size(struct xfs_mount *);
 172
 173
 174 /*
 175  * Values for t_flags.
 176  */
 177 #define XFS_TRANS_DIRTY         0x01    /* something needs to be logged */
 178 #define XFS_TRANS_SB_DIRTY      0x02    /* superblock is modified */
 179 #define XFS_TRANS_PERM_LOG_RES  0x04    /* xact took a permanent log res */
 180 #define XFS_TRANS_SYNC          0x08    /* make commit synchronous */
 181 #define XFS_TRANS_DQ_DIRTY      0x10    /* at least one dquot in trx dirty */
 182 #define XFS_TRANS_RESERVE       0x20    /* OK to use reserved data blocks */
 183 #define XFS_TRANS_FREEZE_PROT   0x40    /* Transaction has elevated writer
 184                                            count in superblock */
 185 /*
 186  * Values for call flags parameter.
 187  */
 188 #define XFS_TRANS_RELEASE_LOG_RES       0x4
 189 #define XFS_TRANS_ABORT                 0x8
 190
 191 /*
 192  * Field values for xfs_trans_mod_sb.
 193  */
 194 #define XFS_TRANS_SB_ICOUNT             0x00000001
 195 #define XFS_TRANS_SB_IFREE              0x00000002
 196 #define XFS_TRANS_SB_FDBLOCKS           0x00000004
 197 #define XFS_TRANS_SB_RES_FDBLOCKS       0x00000008
 198 #define XFS_TRANS_SB_FREXTENTS          0x00000010
 199 #define XFS_TRANS_SB_RES_FREXTENTS      0x00000020
 200 #define XFS_TRANS_SB_DBLOCKS            0x00000040
 201 #define XFS_TRANS_SB_AGCOUNT            0x00000080
 202 #define XFS_TRANS_SB_IMAXPCT            0x00000100
 203 #define XFS_TRANS_SB_REXTSIZE           0x00000200
 204 #define XFS_TRANS_SB_RBMBLOCKS          0x00000400
 205 #define XFS_TRANS_SB_RBLOCKS            0x00000800
 206 #define XFS_TRANS_SB_REXTENTS           0x00001000
 207 #define XFS_TRANS_SB_REXTSLOG           0x00002000
 208
 209 /*
 210  * Here we centralize the specification of XFS meta-data buffer reference count
 211  * values.  This determines how hard the buffer cache tries to hold onto the
 212  * buffer.
 213  */
 214 #define XFS_AGF_REF             4
 215 #define XFS_AGI_REF             4
 216 #define XFS_AGFL_REF            3
 217 #define XFS_INO_BTREE_REF       3
 218 #define XFS_ALLOC_BTREE_REF     2
 219 #define XFS_BMAP_BTREE_REF      2
 220 #define XFS_DIR_BTREE_REF       2
 221 #define XFS_INO_REF             2
 222 #define XFS_ATTR_BTREE_REF      1
 223 #define XFS_DQUOT_REF           1
 224
 225 /*
 226  * Flags for xfs_trans_ichgtime().
 227  */
 228 #define XFS_ICHGTIME_MOD        0x1     /* data fork modification timestamp */
 229 #define XFS_ICHGTIME_CHG        0x2     /* inode field change timestamp */
 230 #define XFS_ICHGTIME_CREATE     0x4     /* inode create timestamp */
 231
 232
 233 /*
 234  * Symlink decoding/encoding functions
 235  */
 236 int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
 237 int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
 238                         uint32_t size, struct xfs_buf *bp);
 239 bool xfs_symlink_hdr_ok(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
 240                         uint32_t size, struct xfs_buf *bp);
 241 void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
 242                                  struct xfs_inode *ip, struct xfs_ifork *ifp);
 243
 244 #endif /* __XFS_SHARED_H__ */