LXR linux/fs/xfs/libxfs/xfs_inode

   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
  21struct xfs_inode_log_item;
  22struct xfs_dinode;
  23
  24/*
  25 * File incore extent information, present for each of data & attr forks.
  26 */
  27typedef 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
 102struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
 103
 104int             xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *);
 105void            xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
 106                                struct xfs_inode_log_item *, int);
 107void            xfs_idestroy_fork(struct xfs_inode *, int);
 108void            xfs_idata_realloc(struct xfs_inode *, int, int);
 109void            xfs_iroot_realloc(struct xfs_inode *, int, int);
 110int             xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
 111int             xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
 112                                  int);
 113void            xfs_init_local_fork(struct xfs_inode *, int, const void *, int);
 114
 115xfs_extnum_t    xfs_iext_count(struct xfs_ifork *ifp);
 116void            xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
 117                        struct xfs_bmbt_irec *, int);
 118void            xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
 119                        int);
 120void            xfs_iext_destroy(struct xfs_ifork *);
 121
 122bool            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);
 126bool            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);
 130bool            xfs_iext_get_extent(struct xfs_ifork *ifp,
 131                        struct xfs_iext_cursor *cur,
 132                        struct xfs_bmbt_irec *gotp);
 133void            xfs_iext_update_extent(struct xfs_inode *ip, int state,
 134                        struct xfs_iext_cursor *cur,
 135                        struct xfs_bmbt_irec *gotp);
 136
 137void            xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
 138void            xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
 139void            xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
 140void            xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
 141
 142static 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
 149static 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 */
 159static 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 */
 171static 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
 185extern struct kmem_zone *xfs_ifork_zone;
 186
 187extern void xfs_ifork_init_cow(struct xfs_inode *ip);
 188
 189typedef xfs_failaddr_t (*xfs_ifork_verifier_t)(struct xfs_inode *);
 190
 191struct xfs_ifork_ops {
 192        xfs_ifork_verifier_t    verify_symlink;
 193        xfs_ifork_verifier_t    verify_dir;
 194        xfs_ifork_verifier_t    verify_attr;
 195};
 196extern struct xfs_ifork_ops     xfs_default_ifork_ops;
 197
 198xfs_failaddr_t xfs_ifork_verify_data(struct xfs_inode *ip,
 199                struct xfs_ifork_ops *ops);
 200xfs_failaddr_t xfs_ifork_verify_attr(struct xfs_inode *ip,
 201                struct xfs_ifork_ops *ops);
 202
 203#endif  /* __XFS_INODE_FORK_H__ */
 204