fs/xfs/libxfs/xfs_inode_fork.h

   1 /*
   2  * Copyright (c) 2000-2003,2005 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_INODE_FORK_H__
  19 #define __XFS_INODE_FORK_H__
  20
  21 struct xfs_inode_log_item;
  22 struct xfs_dinode;
  23
  24 /*
  25  * File incore extent information, present for each of data & attr forks.
  26  */
  27 typedef struct xfs_ifork {
  28         int                     if_bytes;       /* bytes in if_u1 */
  29         int                     if_real_bytes;  /* bytes allocated in if_u1 */
  30         struct xfs_btree_block  *if_broot;      /* file's incore btree root */
  31         short                   if_broot_bytes; /* bytes allocated for root */
  32         unsigned char           if_flags;       /* per-fork flags */
  33         int                     if_height;      /* height of the extent tree */
  34         union {
  35                 void            *if_root;       /* extent tree root */
  36                 char            *if_data;       /* inline file data */
  37         } if_u1;
  38 } xfs_ifork_t;
  39
  40 /*
  41  * Per-fork incore inode flags.
  42  */
  43 #define XFS_IFINLINE    0x01    /* Inline data is read in */
  44 #define XFS_IFEXTENTS   0x02    /* All extent pointers are read in */
  45 #define XFS_IFBROOT     0x04    /* i_broot points to the bmap b-tree root */
  46
  47 /*
  48  * Fork handling.
  49  */
  50
  51 #define XFS_IFORK_Q(ip)                 ((ip)->i_d.di_forkoff != 0)
  52 #define XFS_IFORK_BOFF(ip)              ((int)((ip)->i_d.di_forkoff << 3))
  53
  54 #define XFS_IFORK_PTR(ip,w)             \
  55         ((w) == XFS_DATA_FORK ? \
  56                 &(ip)->i_df : \
  57                 ((w) == XFS_ATTR_FORK ? \
  58                         (ip)->i_afp : \
  59                         (ip)->i_cowfp))
  60 #define XFS_IFORK_DSIZE(ip) \
  61         (XFS_IFORK_Q(ip) ? \
  62                 XFS_IFORK_BOFF(ip) : \
  63                 XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version))
  64 #define XFS_IFORK_ASIZE(ip) \
  65         (XFS_IFORK_Q(ip) ? \
  66                 XFS_LITINO((ip)->i_mount, (ip)->i_d.di_version) - \
  67                         XFS_IFORK_BOFF(ip) : \
  68                 0)
  69 #define XFS_IFORK_SIZE(ip,w) \
  70         ((w) == XFS_DATA_FORK ? \
  71                 XFS_IFORK_DSIZE(ip) : \
  72                 ((w) == XFS_ATTR_FORK ? \
  73                         XFS_IFORK_ASIZE(ip) : \
  74                         0))
  75 #define XFS_IFORK_FORMAT(ip,w) \
  76         ((w) == XFS_DATA_FORK ? \
  77                 (ip)->i_d.di_format : \
  78                 ((w) == XFS_ATTR_FORK ? \
  79                         (ip)->i_d.di_aformat : \
  80                         (ip)->i_cformat))
  81 #define XFS_IFORK_FMT_SET(ip,w,n) \
  82         ((w) == XFS_DATA_FORK ? \
  83                 ((ip)->i_d.di_format = (n)) : \
  84                 ((w) == XFS_ATTR_FORK ? \
  85                         ((ip)->i_d.di_aformat = (n)) : \
  86                         ((ip)->i_cformat = (n))))
  87 #define XFS_IFORK_NEXTENTS(ip,w) \
  88         ((w) == XFS_DATA_FORK ? \
  89                 (ip)->i_d.di_nextents : \
  90                 ((w) == XFS_ATTR_FORK ? \
  91                         (ip)->i_d.di_anextents : \
  92                         (ip)->i_cnextents))
  93 #define XFS_IFORK_NEXT_SET(ip,w,n) \
  94         ((w) == XFS_DATA_FORK ? \
  95                 ((ip)->i_d.di_nextents = (n)) : \
  96                 ((w) == XFS_ATTR_FORK ? \
  97                         ((ip)->i_d.di_anextents = (n)) : \
  98                         ((ip)->i_cnextents = (n))))
  99 #define XFS_IFORK_MAXEXT(ip, w) \
 100         (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))
 101
 102 struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
 103
 104 int             xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *);
 105 void            xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
 106                                 struct xfs_inode_log_item *, int);
 107 void            xfs_idestroy_fork(struct xfs_inode *, int);
 108 void            xfs_idata_realloc(struct xfs_inode *, int, int);
 109 void            xfs_iroot_realloc(struct xfs_inode *, int, int);
 110 int             xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
 111 int             xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
 112                                   int);
 113 void            xfs_init_local_fork(struct xfs_inode *, int, const void *, int);
 114
 115 xfs_extnum_t    xfs_iext_count(struct xfs_ifork *ifp);
 116 void            xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
 117                         struct xfs_bmbt_irec *, int);
 118 void            xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
 119                         int);
 120 void            xfs_iext_destroy(struct xfs_ifork *);
 121
 122 bool            xfs_iext_lookup_extent(struct xfs_inode *ip,
 123                         struct xfs_ifork *ifp, xfs_fileoff_t bno,
 124                         struct xfs_iext_cursor *cur,
 125                         struct xfs_bmbt_irec *gotp);
 126 bool            xfs_iext_lookup_extent_before(struct xfs_inode *ip,
 127                         struct xfs_ifork *ifp, xfs_fileoff_t *end,
 128                         struct xfs_iext_cursor *cur,
 129                         struct xfs_bmbt_irec *gotp);
 130 bool            xfs_iext_get_extent(struct xfs_ifork *ifp,
 131                         struct xfs_iext_cursor *cur,
 132                         struct xfs_bmbt_irec *gotp);
 133 void            xfs_iext_update_extent(struct xfs_inode *ip, int state,
 134                         struct xfs_iext_cursor *cur,
 135                         struct xfs_bmbt_irec *gotp);
 136
 137 void            xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
 138 void            xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
 139 void            xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
 140 void            xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
 141
 142 static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
 143                 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
 144 {
 145         xfs_iext_next(ifp, cur);
 146         return xfs_iext_get_extent(ifp, cur, gotp);
 147 }
 148
 149 static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
 150                 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
 151 {
 152         xfs_iext_prev(ifp, cur);
 153         return xfs_iext_get_extent(ifp, cur, gotp);
 154 }
 155
 156 /*
 157  * Return the extent after cur in gotp without updating the cursor.
 158  */
 159 static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
 160                 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
 161 {
 162         struct xfs_iext_cursor ncur = *cur;
 163
 164         xfs_iext_next(ifp, &ncur);
 165         return xfs_iext_get_extent(ifp, &ncur, gotp);
 166 }
 167
 168 /*
 169  * Return the extent before cur in gotp without updating the cursor.
 170  */
 171 static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
 172                 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
 173 {
 174         struct xfs_iext_cursor ncur = *cur;
 175
 176         xfs_iext_prev(ifp, &ncur);
 177         return xfs_iext_get_extent(ifp, &ncur, gotp);
 178 }
 179
 180 #define for_each_xfs_iext(ifp, ext, got)                \
 181         for (xfs_iext_first((ifp), (ext));              \
 182              xfs_iext_get_extent((ifp), (ext), (got));  \
 183              xfs_iext_next((ifp), (ext)))
 184
 185 extern struct kmem_zone *xfs_ifork_zone;
 186
 187 extern void xfs_ifork_init_cow(struct xfs_inode *ip);
 188
 189 #endif  /* __XFS_INODE_FORK_H__ */