libxfs/xfs_inode_fork.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_INODE_FORK_H__
   7 #define __XFS_INODE_FORK_H__
   8
   9 struct xfs_inode_log_item;
  10 struct xfs_dinode;
  11
  12 /*
  13  * File incore extent information, present for each of data & attr forks.
  14  */
  15 struct xfs_ifork {
  16         int64_t                 if_bytes;       /* bytes in if_u1 */
  17         struct xfs_btree_block  *if_broot;      /* file's incore btree root */
  18         unsigned int            if_seq;         /* fork mod counter */
  19         int                     if_height;      /* height of the extent tree */
  20         union {
  21                 void            *if_root;       /* extent tree root */
  22                 char            *if_data;       /* inline file data */
  23         } if_u1;
  24         short                   if_broot_bytes; /* bytes allocated for root */
  25         unsigned char           if_flags;       /* per-fork flags */
  26         int8_t                  if_format;      /* format of this fork */
  27         xfs_extnum_t            if_nextents;    /* # of extents in this fork */
  28 };
  29
  30 /*
  31  * Per-fork incore inode flags.
  32  */
  33 #define XFS_IFINLINE    0x01    /* Inline data is read in */
  34 #define XFS_IFEXTENTS   0x02    /* All extent pointers are read in */
  35 #define XFS_IFBROOT     0x04    /* i_broot points to the bmap b-tree root */
  36
  37 /*
  38  * Fork handling.
  39  */
  40
  41 #define XFS_IFORK_Q(ip)                 ((ip)->i_d.di_forkoff != 0)
  42 #define XFS_IFORK_BOFF(ip)              ((int)((ip)->i_d.di_forkoff << 3))
  43
  44 #define XFS_IFORK_PTR(ip,w)             \
  45         ((w) == XFS_DATA_FORK ? \
  46                 &(ip)->i_df : \
  47                 ((w) == XFS_ATTR_FORK ? \
  48                         (ip)->i_afp : \
  49                         (ip)->i_cowfp))
  50 #define XFS_IFORK_DSIZE(ip) \
  51         (XFS_IFORK_Q(ip) ? XFS_IFORK_BOFF(ip) : XFS_LITINO((ip)->i_mount))
  52 #define XFS_IFORK_ASIZE(ip) \
  53         (XFS_IFORK_Q(ip) ? XFS_LITINO((ip)->i_mount) - XFS_IFORK_BOFF(ip) : 0)
  54 #define XFS_IFORK_SIZE(ip,w) \
  55         ((w) == XFS_DATA_FORK ? \
  56                 XFS_IFORK_DSIZE(ip) : \
  57                 ((w) == XFS_ATTR_FORK ? \
  58                         XFS_IFORK_ASIZE(ip) : \
  59                         0))
  60 #define XFS_IFORK_MAXEXT(ip, w) \
  61         (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))
  62
  63 static inline bool xfs_ifork_has_extents(struct xfs_ifork *ifp)
  64 {
  65         return ifp->if_format == XFS_DINODE_FMT_EXTENTS ||
  66                 ifp->if_format == XFS_DINODE_FMT_BTREE;
  67 }
  68
  69 static inline xfs_extnum_t xfs_ifork_nextents(struct xfs_ifork *ifp)
  70 {
  71         if (!ifp)
  72                 return 0;
  73         return ifp->if_nextents;
  74 }
  75
  76 static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
  77 {
  78         if (!ifp)
  79                 return XFS_DINODE_FMT_EXTENTS;
  80         return ifp->if_format;
  81 }
  82
  83 struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
  84
  85 int             xfs_iformat_data_fork(struct xfs_inode *, struct xfs_dinode *);
  86 int             xfs_iformat_attr_fork(struct xfs_inode *, struct xfs_dinode *);
  87 void            xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
  88                                 struct xfs_inode_log_item *, int);
  89 void            xfs_idestroy_fork(struct xfs_inode *, int);
  90 void            xfs_idata_realloc(struct xfs_inode *ip, int64_t byte_diff,
  91                                 int whichfork);
  92 void            xfs_iroot_realloc(struct xfs_inode *, int, int);
  93 int             xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
  94 int             xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
  95                                   int);
  96 void            xfs_init_local_fork(struct xfs_inode *ip, int whichfork,
  97                                 const void *data, int64_t size);
  98
  99 xfs_extnum_t    xfs_iext_count(struct xfs_ifork *ifp);
 100 void            xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
 101                         struct xfs_bmbt_irec *, int);
 102 void            xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
 103                         int);
 104 void            xfs_iext_destroy(struct xfs_ifork *);
 105
 106 bool            xfs_iext_lookup_extent(struct xfs_inode *ip,
 107                         struct xfs_ifork *ifp, xfs_fileoff_t bno,
 108                         struct xfs_iext_cursor *cur,
 109                         struct xfs_bmbt_irec *gotp);
 110 bool            xfs_iext_lookup_extent_before(struct xfs_inode *ip,
 111                         struct xfs_ifork *ifp, xfs_fileoff_t *end,
 112                         struct xfs_iext_cursor *cur,
 113                         struct xfs_bmbt_irec *gotp);
 114 bool            xfs_iext_get_extent(struct xfs_ifork *ifp,
 115                         struct xfs_iext_cursor *cur,
 116                         struct xfs_bmbt_irec *gotp);
 117 void            xfs_iext_update_extent(struct xfs_inode *ip, int state,
 118                         struct xfs_iext_cursor *cur,
 119                         struct xfs_bmbt_irec *gotp);
 120
 121 void            xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
 122 void            xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
 123 void            xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
 124 void            xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
 125
 126 static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
 127                 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
 128 {
 129         xfs_iext_next(ifp, cur);
 130         return xfs_iext_get_extent(ifp, cur, gotp);
 131 }
 132
 133 static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
 134                 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
 135 {
 136         xfs_iext_prev(ifp, cur);
 137         return xfs_iext_get_extent(ifp, cur, gotp);
 138 }
 139
 140 /*
 141  * Return the extent after cur in gotp without updating the cursor.
 142  */
 143 static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
 144                 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
 145 {
 146         struct xfs_iext_cursor ncur = *cur;
 147
 148         xfs_iext_next(ifp, &ncur);
 149         return xfs_iext_get_extent(ifp, &ncur, gotp);
 150 }
 151
 152 /*
 153  * Return the extent before cur in gotp without updating the cursor.
 154  */
 155 static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
 156                 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
 157 {
 158         struct xfs_iext_cursor ncur = *cur;
 159
 160         xfs_iext_prev(ifp, &ncur);
 161         return xfs_iext_get_extent(ifp, &ncur, gotp);
 162 }
 163
 164 #define for_each_xfs_iext(ifp, ext, got)                \
 165         for (xfs_iext_first((ifp), (ext));              \
 166              xfs_iext_get_extent((ifp), (ext), (got));  \
 167              xfs_iext_next((ifp), (ext)))
 168
 169 extern struct kmem_zone *xfs_ifork_zone;
 170
 171 extern void xfs_ifork_init_cow(struct xfs_inode *ip);
 172
 173 int xfs_ifork_verify_local_data(struct xfs_inode *ip);
 174 int xfs_ifork_verify_local_attr(struct xfs_inode *ip);
 175
 176 #endif  /* __XFS_INODE_FORK_H__ */