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         __be32          t_sec;          /* timestamp seconds */
  38         __be32          t_nsec;         /* timestamp nanoseconds */
  39 } xfs_timestamp_t;
  40
  41 /*
  42  * Note: Coordinate changes to this structure with the XFS_DI_* #defines
  43  * below, the offsets table in xfs_ialloc_log_di() and struct xfs_icdinode
  44  * in xfs_inode.h.
  45  */
  46 typedef struct xfs_dinode_core {
  47         __be16          di_magic;       /* inode magic # = XFS_DINODE_MAGIC */
  48         __be16          di_mode;        /* mode and type of file */
  49         __u8            di_version;     /* inode version */
  50         __u8            di_format;      /* format of di_c data */
  51         __be16          di_onlink;      /* old number of links to file */
  52         __be32          di_uid;         /* owner's user id */
  53         __be32          di_gid;         /* owner's group id */
  54         __be32          di_nlink;       /* number of links to file */
  55         __be16          di_projid;      /* owner's project id */
  56         __u8            di_pad[8];      /* unused, zeroed space */
  57         __be16          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         __be64          di_size;        /* number of bytes in file */
  62         __be64          di_nblocks;     /* # of direct & btree blocks used */
  63         __be32          di_extsize;     /* basic/minimum extent size for file */
  64         __be32          di_nextents;    /* number of extents in data fork */
  65         __be16          di_anextents;   /* number of extents in attribute fork*/
  66         __u8            di_forkoff;     /* attr fork offs, <<3 for 64b align */
  67         __s8            di_aformat;     /* format of attr fork's data */
  68         __be32          di_dmevmask;    /* DMIG event mask */
  69         __be16          di_dmstate;     /* DMIG state info */
  70         __be16          di_flags;       /* random flags, XFS_DIFLAG_... */
  71         __be32          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         __be32                  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_dir2_sf_t   di_dir2sf;      /* shortform directory v2 */
  89                 char            di_c[1];        /* local contents */
  90                 __be32          di_dev;         /* device for S_IFCHR/S_IFBLK */
  91                 uuid_t          di_muuid;       /* mount point value */
  92                 char            di_symlink[1];  /* local symbolic link */
  93         }               di_u;
  94         union {
  95                 xfs_bmdr_block_t di_abmbt;      /* btree root block */
  96                 xfs_bmbt_rec_32_t di_abmx[1];   /* extent list */
  97                 xfs_attr_shortform_t di_attrsf; /* shortform attribute list */
  98         }               di_a;
  99 } xfs_dinode_t;
 100
 101 /*
 102  * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
 103  * Since the pathconf interface is signed, we use 2^31 - 1 instead.
 104  * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
 105  */
 106 #define XFS_MAXLINK             ((1U << 31) - 1U)
 107 #define XFS_MAXLINK_1           65535U
 108
 109 /*
 110  * Bit names for logging disk inodes only
 111  */
 112 #define XFS_DI_MAGIC            0x0000001
 113 #define XFS_DI_MODE             0x0000002
 114 #define XFS_DI_VERSION          0x0000004
 115 #define XFS_DI_FORMAT           0x0000008
 116 #define XFS_DI_ONLINK           0x0000010
 117 #define XFS_DI_UID              0x0000020
 118 #define XFS_DI_GID              0x0000040
 119 #define XFS_DI_NLINK            0x0000080
 120 #define XFS_DI_PROJID           0x0000100
 121 #define XFS_DI_PAD              0x0000200
 122 #define XFS_DI_ATIME            0x0000400
 123 #define XFS_DI_MTIME            0x0000800
 124 #define XFS_DI_CTIME            0x0001000
 125 #define XFS_DI_SIZE             0x0002000
 126 #define XFS_DI_NBLOCKS          0x0004000
 127 #define XFS_DI_EXTSIZE          0x0008000
 128 #define XFS_DI_NEXTENTS         0x0010000
 129 #define XFS_DI_NAEXTENTS        0x0020000
 130 #define XFS_DI_FORKOFF          0x0040000
 131 #define XFS_DI_AFORMAT          0x0080000
 132 #define XFS_DI_DMEVMASK         0x0100000
 133 #define XFS_DI_DMSTATE          0x0200000
 134 #define XFS_DI_FLAGS            0x0400000
 135 #define XFS_DI_GEN              0x0800000
 136 #define XFS_DI_NEXT_UNLINKED    0x1000000
 137 #define XFS_DI_U                0x2000000
 138 #define XFS_DI_A                0x4000000
 139 #define XFS_DI_NUM_BITS         27
 140 #define XFS_DI_ALL_BITS         ((1 << XFS_DI_NUM_BITS) - 1)
 141 #define XFS_DI_CORE_BITS        (XFS_DI_ALL_BITS & ~(XFS_DI_U|XFS_DI_A))
 142
 143 /*
 144  * Values for di_format
 145  */
 146 typedef enum xfs_dinode_fmt
 147 {
 148         XFS_DINODE_FMT_DEV,             /* CHR, BLK: di_dev */
 149         XFS_DINODE_FMT_LOCAL,           /* DIR, REG: di_c */
 150                                         /* LNK: di_symlink */
 151         XFS_DINODE_FMT_EXTENTS,         /* DIR, REG, LNK: di_bmx */
 152         XFS_DINODE_FMT_BTREE,           /* DIR, REG, LNK: di_bmbt */
 153         XFS_DINODE_FMT_UUID             /* MNT: di_uuid */
 154 } xfs_dinode_fmt_t;
 155
 156 /*
 157  * Inode minimum and maximum sizes.
 158  */
 159 #define XFS_DINODE_MIN_LOG      8
 160 #define XFS_DINODE_MAX_LOG      11
 161 #define XFS_DINODE_MIN_SIZE     (1 << XFS_DINODE_MIN_LOG)
 162 #define XFS_DINODE_MAX_SIZE     (1 << XFS_DINODE_MAX_LOG)
 163
 164 /*
 165  * Inode size for given fs.
 166  */
 167 #define XFS_LITINO(mp)  ((mp)->m_litino)
 168 #define XFS_BROOT_SIZE_ADJ      \
 169         (sizeof(xfs_bmbt_block_t) - sizeof(xfs_bmdr_block_t))
 170
 171 /*
 172  * Inode data & attribute fork sizes, per inode.
 173  */
 174 #define XFS_DFORK_Q(dip)                ((dip)->di_core.di_forkoff != 0)
 175 #define XFS_DFORK_BOFF(dip)             ((int)((dip)->di_core.di_forkoff << 3))
 176
 177 #define XFS_DFORK_DSIZE(dip,mp) \
 178         (XFS_DFORK_Q(dip) ? \
 179                 XFS_DFORK_BOFF(dip) : \
 180                 XFS_LITINO(mp))
 181 #define XFS_DFORK_ASIZE(dip,mp) \
 182         (XFS_DFORK_Q(dip) ? \
 183                 XFS_LITINO(mp) - XFS_DFORK_BOFF(dip) : \
 184                 0)
 185 #define XFS_DFORK_SIZE(dip,mp,w) \
 186         ((w) == XFS_DATA_FORK ? \
 187                 XFS_DFORK_DSIZE(dip, mp) : \
 188                 XFS_DFORK_ASIZE(dip, mp))
 189
 190 #define XFS_DFORK_DPTR(dip)                 ((dip)->di_u.di_c)
 191 #define XFS_DFORK_APTR(dip)     \
 192         ((dip)->di_u.di_c + XFS_DFORK_BOFF(dip))
 193 #define XFS_DFORK_PTR(dip,w)    \
 194         ((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
 195 #define XFS_DFORK_FORMAT(dip,w) \
 196         ((w) == XFS_DATA_FORK ? \
 197                 (dip)->di_core.di_format : \
 198                 (dip)->di_core.di_aformat)
 199 #define XFS_DFORK_NEXTENTS(dip,w) \
 200         ((w) == XFS_DATA_FORK ? \
 201                 be32_to_cpu((dip)->di_core.di_nextents) : \
 202                 be16_to_cpu((dip)->di_core.di_anextents))
 203
 204 #define XFS_BUF_TO_DINODE(bp)   ((xfs_dinode_t *)XFS_BUF_PTR(bp))
 205
 206 /*
 207  * Values for di_flags
 208  * There should be a one-to-one correspondence between these flags and the
 209  * XFS_XFLAG_s.
 210  */
 211 #define XFS_DIFLAG_REALTIME_BIT  0      /* file's blocks come from rt area */
 212 #define XFS_DIFLAG_PREALLOC_BIT  1      /* file space has been preallocated */
 213 #define XFS_DIFLAG_NEWRTBM_BIT   2      /* for rtbitmap inode, new format */
 214 #define XFS_DIFLAG_IMMUTABLE_BIT 3      /* inode is immutable */
 215 #define XFS_DIFLAG_APPEND_BIT    4      /* inode is append-only */
 216 #define XFS_DIFLAG_SYNC_BIT      5      /* inode is written synchronously */
 217 #define XFS_DIFLAG_NOATIME_BIT   6      /* do not update atime */
 218 #define XFS_DIFLAG_NODUMP_BIT    7      /* do not dump */
 219 #define XFS_DIFLAG_RTINHERIT_BIT 8      /* create with realtime bit set */
 220 #define XFS_DIFLAG_PROJINHERIT_BIT   9  /* create with parents projid */
 221 #define XFS_DIFLAG_NOSYMLINKS_BIT   10  /* disallow symlink creation */
 222 #define XFS_DIFLAG_EXTSIZE_BIT      11  /* inode extent size allocator hint */
 223 #define XFS_DIFLAG_EXTSZINHERIT_BIT 12  /* inherit inode extent size */
 224 #define XFS_DIFLAG_NODEFRAG_BIT     13  /* do not reorganize/defragment */
 225 #define XFS_DIFLAG_FILESTREAM_BIT   14  /* use filestream allocator */
 226 #define XFS_DIFLAG_REALTIME      (1 << XFS_DIFLAG_REALTIME_BIT)
 227 #define XFS_DIFLAG_PREALLOC      (1 << XFS_DIFLAG_PREALLOC_BIT)
 228 #define XFS_DIFLAG_NEWRTBM       (1 << XFS_DIFLAG_NEWRTBM_BIT)
 229 #define XFS_DIFLAG_IMMUTABLE     (1 << XFS_DIFLAG_IMMUTABLE_BIT)
 230 #define XFS_DIFLAG_APPEND        (1 << XFS_DIFLAG_APPEND_BIT)
 231 #define XFS_DIFLAG_SYNC          (1 << XFS_DIFLAG_SYNC_BIT)
 232 #define XFS_DIFLAG_NOATIME       (1 << XFS_DIFLAG_NOATIME_BIT)
 233 #define XFS_DIFLAG_NODUMP        (1 << XFS_DIFLAG_NODUMP_BIT)
 234 #define XFS_DIFLAG_RTINHERIT     (1 << XFS_DIFLAG_RTINHERIT_BIT)
 235 #define XFS_DIFLAG_PROJINHERIT   (1 << XFS_DIFLAG_PROJINHERIT_BIT)
 236 #define XFS_DIFLAG_NOSYMLINKS    (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
 237 #define XFS_DIFLAG_EXTSIZE       (1 << XFS_DIFLAG_EXTSIZE_BIT)
 238 #define XFS_DIFLAG_EXTSZINHERIT  (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
 239 #define XFS_DIFLAG_NODEFRAG      (1 << XFS_DIFLAG_NODEFRAG_BIT)
 240 #define XFS_DIFLAG_FILESTREAM    (1 << XFS_DIFLAG_FILESTREAM_BIT)
 241
 242 #ifdef CONFIG_XFS_RT
 243 #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
 244 #else
 245 #define XFS_IS_REALTIME_INODE(ip) (0)
 246 #endif
 247
 248 #define XFS_DIFLAG_ANY \
 249         (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
 250          XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
 251          XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
 252          XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
 253          XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
 254
 255 #endif  /* __XFS_DINODE_H__ */