fs/xfs/xfs_dinode.h

   1 /*
   2  * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_DINODE_H__
  19 #define __XFS_DINODE_H__
  20
  21 struct xfs_buf;
  22 struct xfs_mount;
  23
  24 #define XFS_DINODE_VERSION_1    1
  25 #define XFS_DINODE_VERSION_2    2
  26 #define XFS_DINODE_GOOD_VERSION(v)      \
  27         (((v) == XFS_DINODE_VERSION_1 || (v) == XFS_DINODE_VERSION_2))
  28 #define XFS_DINODE_MAGIC        0x494e  /* 'IN' */
  29
  30 /*
  31  * Disk inode structure.
  32  * This is just the header; the inode is expanded to fill a variable size
  33  * with the last field expanding.  It is split into the core and "other"
  34  * because we only need the core part in the in-core inode.
  35  */
  36 typedef struct xfs_timestamp {
  37         __int32_t       t_sec;          /* timestamp seconds */
  38         __int32_t       t_nsec;         /* timestamp nanoseconds */
  39 } xfs_timestamp_t;
  40
  41 /*
  42  * Note: Coordinate changes to this structure with the XFS_DI_* #defines
  43  * below and the offsets table in xfs_ialloc_log_di().
  44  */
  45 typedef struct xfs_dinode_core
  46 {
  47         __uint16_t      di_magic;       /* inode magic # = XFS_DINODE_MAGIC */
  48         __uint16_t      di_mode;        /* mode and type of file */
  49         __int8_t        di_version;     /* inode version */
  50         __int8_t        di_format;      /* format of di_c data */
  51         __uint16_t      di_onlink;      /* old number of links to file */
  52         __uint32_t      di_uid;         /* owner's user id */
  53         __uint32_t      di_gid;         /* owner's group id */
  54         __uint32_t      di_nlink;       /* number of links to file */
  55         __uint16_t      di_projid;      /* owner's project id */
  56         __uint8_t       di_pad[8];      /* unused, zeroed space */
  57         __uint16_t      di_flushiter;   /* incremented on flush */
  58         xfs_timestamp_t di_atime;       /* time last accessed */
  59         xfs_timestamp_t di_mtime;       /* time last modified */
  60         xfs_timestamp_t di_ctime;       /* time created/inode modified */
  61         xfs_fsize_t     di_size;        /* number of bytes in file */
  62         xfs_drfsbno_t   di_nblocks;     /* # of direct & btree blocks used */
  63         xfs_extlen_t    di_extsize;     /* basic/minimum extent size for file */
  64         xfs_extnum_t    di_nextents;    /* number of extents in data fork */
  65         xfs_aextnum_t   di_anextents;   /* number of extents in attribute fork*/
  66         __uint8_t       di_forkoff;     /* attr fork offs, <<3 for 64b align */
  67         __int8_t        di_aformat;     /* format of attr fork's data */
  68         __uint32_t      di_dmevmask;    /* DMIG event mask */
  69         __uint16_t      di_dmstate;     /* DMIG state info */
  70         __uint16_t      di_flags;       /* random flags, XFS_DIFLAG_... */
  71         __uint32_t      di_gen;         /* generation number */
  72 } xfs_dinode_core_t;
  73
  74 #define DI_MAX_FLUSH 0xffff
  75
  76 typedef struct xfs_dinode
  77 {
  78         xfs_dinode_core_t       di_core;
  79         /*
  80          * In adding anything between the core and the union, be
  81          * sure to update the macros like XFS_LITINO below and
  82          * XFS_BMAP_RBLOCK_DSIZE in xfs_bmap_btree.h.
  83          */
  84         xfs_agino_t             di_next_unlinked;/* agi unlinked list ptr */
  85         union {
  86                 xfs_bmdr_block_t di_bmbt;       /* btree root block */
  87                 xfs_bmbt_rec_32_t di_bmx[1];    /* extent list */
  88                 xfs_dir_shortform_t di_dirsf;   /* shortform directory */
  89                 xfs_dir2_sf_t   di_dir2sf;      /* shortform directory v2 */
  90                 char            di_c[1];        /* local contents */
  91                 xfs_dev_t       di_dev;         /* device for S_IFCHR/S_IFBLK */
  92                 uuid_t          di_muuid;       /* mount point value */
  93                 char            di_symlink[1];  /* local symbolic link */
  94         }               di_u;
  95         union {
  96                 xfs_bmdr_block_t di_abmbt;      /* btree root block */
  97                 xfs_bmbt_rec_32_t di_abmx[1];   /* extent list */
  98                 xfs_attr_shortform_t di_attrsf; /* shortform attribute list */
  99         }               di_a;
 100 } xfs_dinode_t;
 101
 102 /*
 103  * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
 104  * Since the pathconf interface is signed, we use 2^31 - 1 instead.
 105  * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
 106  */
 107 #define XFS_MAXLINK             ((1U << 31) - 1U)
 108 #define XFS_MAXLINK_1           65535U
 109
 110 /*
 111  * Bit names for logging disk inodes only
 112  */
 113 #define XFS_DI_MAGIC            0x0000001
 114 #define XFS_DI_MODE             0x0000002
 115 #define XFS_DI_VERSION          0x0000004
 116 #define XFS_DI_FORMAT           0x0000008
 117 #define XFS_DI_ONLINK           0x0000010
 118 #define XFS_DI_UID              0x0000020
 119 #define XFS_DI_GID              0x0000040
 120 #define XFS_DI_NLINK            0x0000080
 121 #define XFS_DI_PROJID           0x0000100
 122 #define XFS_DI_PAD              0x0000200
 123 #define XFS_DI_ATIME            0x0000400
 124 #define XFS_DI_MTIME            0x0000800
 125 #define XFS_DI_CTIME            0x0001000
 126 #define XFS_DI_SIZE             0x0002000
 127 #define XFS_DI_NBLOCKS          0x0004000
 128 #define XFS_DI_EXTSIZE          0x0008000
 129 #define XFS_DI_NEXTENTS         0x0010000
 130 #define XFS_DI_NAEXTENTS        0x0020000
 131 #define XFS_DI_FORKOFF          0x0040000
 132 #define XFS_DI_AFORMAT          0x0080000
 133 #define XFS_DI_DMEVMASK         0x0100000
 134 #define XFS_DI_DMSTATE          0x0200000
 135 #define XFS_DI_FLAGS            0x0400000
 136 #define XFS_DI_GEN              0x0800000
 137 #define XFS_DI_NEXT_UNLINKED    0x1000000
 138 #define XFS_DI_U                0x2000000
 139 #define XFS_DI_A                0x4000000
 140 #define XFS_DI_NUM_BITS         27
 141 #define XFS_DI_ALL_BITS         ((1 << XFS_DI_NUM_BITS) - 1)
 142 #define XFS_DI_CORE_BITS        (XFS_DI_ALL_BITS & ~(XFS_DI_U|XFS_DI_A))
 143
 144 /*
 145  * Values for di_format
 146  */
 147 typedef enum xfs_dinode_fmt
 148 {
 149         XFS_DINODE_FMT_DEV,             /* CHR, BLK: di_dev */
 150         XFS_DINODE_FMT_LOCAL,           /* DIR, REG: di_c */
 151                                         /* LNK: di_symlink */
 152         XFS_DINODE_FMT_EXTENTS,         /* DIR, REG, LNK: di_bmx */
 153         XFS_DINODE_FMT_BTREE,           /* DIR, REG, LNK: di_bmbt */
 154         XFS_DINODE_FMT_UUID             /* MNT: di_uuid */
 155 } xfs_dinode_fmt_t;
 156
 157 /*
 158  * Inode minimum and maximum sizes.
 159  */
 160 #define XFS_DINODE_MIN_LOG      8
 161 #define XFS_DINODE_MAX_LOG      11
 162 #define XFS_DINODE_MIN_SIZE     (1 << XFS_DINODE_MIN_LOG)
 163 #define XFS_DINODE_MAX_SIZE     (1 << XFS_DINODE_MAX_LOG)
 164
 165 /*
 166  * Inode size for given fs.
 167  */
 168 #define XFS_LITINO(mp)  ((mp)->m_litino)
 169 #define XFS_BROOT_SIZE_ADJ      \
 170         (sizeof(xfs_bmbt_block_t) - sizeof(xfs_bmdr_block_t))
 171
 172 /*
 173  * Inode data & attribute fork sizes, per inode.
 174  */
 175 #define XFS_CFORK_Q(dcp)                    ((dcp)->di_forkoff != 0)
 176 #define XFS_CFORK_Q_DISK(dcp)               ((dcp)->di_forkoff != 0)
 177
 178 #define XFS_CFORK_BOFF(dcp)                 ((int)((dcp)->di_forkoff << 3))
 179 #define XFS_CFORK_BOFF_DISK(dcp) \
 180         ((int)(INT_GET((dcp)->di_forkoff, ARCH_CONVERT) << 3))
 181
 182 #define XFS_CFORK_DSIZE_DISK(dcp,mp) \
 183         (XFS_CFORK_Q_DISK(dcp) ? XFS_CFORK_BOFF_DISK(dcp) : XFS_LITINO(mp))
 184 #define XFS_CFORK_DSIZE(dcp,mp) \
 185         (XFS_CFORK_Q(dcp) ? XFS_CFORK_BOFF(dcp) : XFS_LITINO(mp))
 186
 187 #define XFS_CFORK_ASIZE_DISK(dcp,mp) \
 188         (XFS_CFORK_Q_DISK(dcp) ? XFS_LITINO(mp) - XFS_CFORK_BOFF_DISK(dcp) : 0)
 189 #define XFS_CFORK_ASIZE(dcp,mp) \
 190         (XFS_CFORK_Q(dcp) ? XFS_LITINO(mp) - XFS_CFORK_BOFF(dcp) : 0)
 191
 192 #define XFS_CFORK_SIZE_DISK(dcp,mp,w) \
 193         ((w) == XFS_DATA_FORK ? \
 194                 XFS_CFORK_DSIZE_DISK(dcp, mp) : \
 195                 XFS_CFORK_ASIZE_DISK(dcp, mp))
 196 #define XFS_CFORK_SIZE(dcp,mp,w) \
 197         ((w) == XFS_DATA_FORK ? \
 198                 XFS_CFORK_DSIZE(dcp, mp) : XFS_CFORK_ASIZE(dcp, mp))
 199
 200 #define XFS_DFORK_DSIZE(dip,mp) \
 201         XFS_CFORK_DSIZE_DISK(&(dip)->di_core, mp)
 202 #define XFS_DFORK_ASIZE(dip,mp) \
 203         XFS_CFORK_ASIZE_DISK(&(dip)->di_core, mp)
 204 #define XFS_DFORK_SIZE(dip,mp,w) \
 205         XFS_CFORK_SIZE_DISK(&(dip)->di_core, mp, w)
 206
 207 #define XFS_DFORK_Q(dip)                    XFS_CFORK_Q_DISK(&(dip)->di_core)
 208 #define XFS_DFORK_BOFF(dip)                 XFS_CFORK_BOFF_DISK(&(dip)->di_core)
 209 #define XFS_DFORK_DPTR(dip)                 ((dip)->di_u.di_c)
 210 #define XFS_DFORK_APTR(dip)     \
 211         ((dip)->di_u.di_c + XFS_DFORK_BOFF(dip))
 212 #define XFS_DFORK_PTR(dip,w)    \
 213         ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
 214 #define XFS_CFORK_FORMAT(dcp,w) \
 215         ((w) == XFS_DATA_FORK ? (dcp)->di_format : (dcp)->di_aformat)
 216 #define XFS_CFORK_FMT_SET(dcp,w,n) \
 217         ((w) == XFS_DATA_FORK ? \
 218                 ((dcp)->di_format = (n)) : ((dcp)->di_aformat = (n)))
 219
 220 #define XFS_CFORK_NEXTENTS_DISK(dcp,w) \
 221         ((w) == XFS_DATA_FORK ? \
 222                 INT_GET((dcp)->di_nextents, ARCH_CONVERT) : \
 223                 INT_GET((dcp)->di_anextents, ARCH_CONVERT))
 224 #define XFS_CFORK_NEXTENTS(dcp,w) \
 225         ((w) == XFS_DATA_FORK ? (dcp)->di_nextents : (dcp)->di_anextents)
 226
 227 #define XFS_CFORK_NEXT_SET(dcp,w,n) \
 228         ((w) == XFS_DATA_FORK ? \
 229                 ((dcp)->di_nextents = (n)) : ((dcp)->di_anextents = (n)))
 230
 231 #define XFS_DFORK_NEXTENTS(dip,w) XFS_CFORK_NEXTENTS_DISK(&(dip)->di_core, w)
 232
 233 #define XFS_BUF_TO_DINODE(bp)   ((xfs_dinode_t *)XFS_BUF_PTR(bp))
 234
 235 /*
 236  * Values for di_flags
 237  * There should be a one-to-one correspondence between these flags and the
 238  * XFS_XFLAG_s.
 239  */
 240 #define XFS_DIFLAG_REALTIME_BIT  0      /* file's blocks come from rt area */
 241 #define XFS_DIFLAG_PREALLOC_BIT  1      /* file space has been preallocated */
 242 #define XFS_DIFLAG_NEWRTBM_BIT   2      /* for rtbitmap inode, new format */
 243 #define XFS_DIFLAG_IMMUTABLE_BIT 3      /* inode is immutable */
 244 #define XFS_DIFLAG_APPEND_BIT    4      /* inode is append-only */
 245 #define XFS_DIFLAG_SYNC_BIT      5      /* inode is written synchronously */
 246 #define XFS_DIFLAG_NOATIME_BIT   6      /* do not update atime */
 247 #define XFS_DIFLAG_NODUMP_BIT    7      /* do not dump */
 248 #define XFS_DIFLAG_RTINHERIT_BIT 8      /* create with realtime bit set */
 249 #define XFS_DIFLAG_PROJINHERIT_BIT  9   /* create with parents projid */
 250 #define XFS_DIFLAG_NOSYMLINKS_BIT  10   /* disallow symlink creation */
 251 #define XFS_DIFLAG_REALTIME      (1 << XFS_DIFLAG_REALTIME_BIT)
 252 #define XFS_DIFLAG_PREALLOC      (1 << XFS_DIFLAG_PREALLOC_BIT)
 253 #define XFS_DIFLAG_NEWRTBM       (1 << XFS_DIFLAG_NEWRTBM_BIT)
 254 #define XFS_DIFLAG_IMMUTABLE     (1 << XFS_DIFLAG_IMMUTABLE_BIT)
 255 #define XFS_DIFLAG_APPEND        (1 << XFS_DIFLAG_APPEND_BIT)
 256 #define XFS_DIFLAG_SYNC          (1 << XFS_DIFLAG_SYNC_BIT)
 257 #define XFS_DIFLAG_NOATIME       (1 << XFS_DIFLAG_NOATIME_BIT)
 258 #define XFS_DIFLAG_NODUMP        (1 << XFS_DIFLAG_NODUMP_BIT)
 259 #define XFS_DIFLAG_RTINHERIT     (1 << XFS_DIFLAG_RTINHERIT_BIT)
 260 #define XFS_DIFLAG_PROJINHERIT   (1 << XFS_DIFLAG_PROJINHERIT_BIT)
 261 #define XFS_DIFLAG_NOSYMLINKS    (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
 262
 263 #define XFS_DIFLAG_ANY \
 264         (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
 265          XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
 266          XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
 267          XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS)
 268
 269 #endif  /* __XFS_DINODE_H__ */