libxfs/xfs_rmap.h

   1 /*
   2  * Copyright (C) 2016 Oracle.  All Rights Reserved.
   3  *
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it would be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write the Free Software Foundation,
  18  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
  19  */
  20 #ifndef __XFS_RMAP_H__
  21 #define __XFS_RMAP_H__
  22
  23 static inline void
  24 xfs_rmap_ag_owner(
  25         struct xfs_owner_info   *oi,
  26         uint64_t                owner)
  27 {
  28         oi->oi_owner = owner;
  29         oi->oi_offset = 0;
  30         oi->oi_flags = 0;
  31 }
  32
  33 static inline void
  34 xfs_rmap_ino_bmbt_owner(
  35         struct xfs_owner_info   *oi,
  36         xfs_ino_t               ino,
  37         int                     whichfork)
  38 {
  39         oi->oi_owner = ino;
  40         oi->oi_offset = 0;
  41         oi->oi_flags = XFS_OWNER_INFO_BMBT_BLOCK;
  42         if (whichfork == XFS_ATTR_FORK)
  43                 oi->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
  44 }
  45
  46 static inline void
  47 xfs_rmap_ino_owner(
  48         struct xfs_owner_info   *oi,
  49         xfs_ino_t               ino,
  50         int                     whichfork,
  51         xfs_fileoff_t           offset)
  52 {
  53         oi->oi_owner = ino;
  54         oi->oi_offset = offset;
  55         oi->oi_flags = 0;
  56         if (whichfork == XFS_ATTR_FORK)
  57                 oi->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
  58 }
  59
  60 static inline void
  61 xfs_rmap_skip_owner_update(
  62         struct xfs_owner_info   *oi)
  63 {
  64         oi->oi_owner = XFS_RMAP_OWN_UNKNOWN;
  65 }
  66
  67 /* Reverse mapping functions. */
  68
  69 struct xfs_buf;
  70
  71 static inline __u64
  72 xfs_rmap_irec_offset_pack(
  73         const struct xfs_rmap_irec      *irec)
  74 {
  75         __u64                   x;
  76
  77         x = XFS_RMAP_OFF(irec->rm_offset);
  78         if (irec->rm_flags & XFS_RMAP_ATTR_FORK)
  79                 x |= XFS_RMAP_OFF_ATTR_FORK;
  80         if (irec->rm_flags & XFS_RMAP_BMBT_BLOCK)
  81                 x |= XFS_RMAP_OFF_BMBT_BLOCK;
  82         if (irec->rm_flags & XFS_RMAP_UNWRITTEN)
  83                 x |= XFS_RMAP_OFF_UNWRITTEN;
  84         return x;
  85 }
  86
  87 static inline int
  88 xfs_rmap_irec_offset_unpack(
  89         __u64                   offset,
  90         struct xfs_rmap_irec    *irec)
  91 {
  92         if (offset & ~(XFS_RMAP_OFF_MASK | XFS_RMAP_OFF_FLAGS))
  93                 return -EFSCORRUPTED;
  94         irec->rm_offset = XFS_RMAP_OFF(offset);
  95         if (offset & XFS_RMAP_OFF_ATTR_FORK)
  96                 irec->rm_flags |= XFS_RMAP_ATTR_FORK;
  97         if (offset & XFS_RMAP_OFF_BMBT_BLOCK)
  98                 irec->rm_flags |= XFS_RMAP_BMBT_BLOCK;
  99         if (offset & XFS_RMAP_OFF_UNWRITTEN)
 100                 irec->rm_flags |= XFS_RMAP_UNWRITTEN;
 101         return 0;
 102 }
 103
 104 static inline void
 105 xfs_owner_info_unpack(
 106         struct xfs_owner_info   *oinfo,
 107         uint64_t                *owner,
 108         uint64_t                *offset,
 109         unsigned int            *flags)
 110 {
 111         unsigned int            r = 0;
 112
 113         *owner = oinfo->oi_owner;
 114         *offset = oinfo->oi_offset;
 115         if (oinfo->oi_flags & XFS_OWNER_INFO_ATTR_FORK)
 116                 r |= XFS_RMAP_ATTR_FORK;
 117         if (oinfo->oi_flags & XFS_OWNER_INFO_BMBT_BLOCK)
 118                 r |= XFS_RMAP_BMBT_BLOCK;
 119         *flags = r;
 120 }
 121
 122 static inline void
 123 xfs_owner_info_pack(
 124         struct xfs_owner_info   *oinfo,
 125         uint64_t                owner,
 126         uint64_t                offset,
 127         unsigned int            flags)
 128 {
 129         oinfo->oi_owner = owner;
 130         oinfo->oi_offset = XFS_RMAP_OFF(offset);
 131         oinfo->oi_flags = 0;
 132         if (flags & XFS_RMAP_ATTR_FORK)
 133                 oinfo->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
 134         if (flags & XFS_RMAP_BMBT_BLOCK)
 135                 oinfo->oi_flags |= XFS_OWNER_INFO_BMBT_BLOCK;
 136 }
 137
 138 int xfs_rmap_alloc(struct xfs_trans *tp, struct xfs_buf *agbp,
 139                    xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
 140                    struct xfs_owner_info *oinfo);
 141 int xfs_rmap_free(struct xfs_trans *tp, struct xfs_buf *agbp,
 142                   xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
 143                   struct xfs_owner_info *oinfo);
 144
 145 int xfs_rmap_lookup_le(struct xfs_btree_cur *cur, xfs_agblock_t bno,
 146                 xfs_extlen_t len, uint64_t owner, uint64_t offset,
 147                 unsigned int flags, int *stat);
 148 int xfs_rmap_lookup_eq(struct xfs_btree_cur *cur, xfs_agblock_t bno,
 149                 xfs_extlen_t len, uint64_t owner, uint64_t offset,
 150                 unsigned int flags, int *stat);
 151 int xfs_rmap_insert(struct xfs_btree_cur *rcur, xfs_agblock_t agbno,
 152                 xfs_extlen_t len, uint64_t owner, uint64_t offset,
 153                 unsigned int flags);
 154 int xfs_rmap_get_rec(struct xfs_btree_cur *cur, struct xfs_rmap_irec *irec,
 155                 int *stat);
 156
 157 typedef int (*xfs_rmap_query_range_fn)(
 158         struct xfs_btree_cur    *cur,
 159         struct xfs_rmap_irec    *rec,
 160         void                    *priv);
 161
 162 int xfs_rmap_query_range(struct xfs_btree_cur *cur,
 163                 struct xfs_rmap_irec *low_rec, struct xfs_rmap_irec *high_rec,
 164                 xfs_rmap_query_range_fn fn, void *priv);
 165
 166 enum xfs_rmap_intent_type {
 167         XFS_RMAP_MAP,
 168         XFS_RMAP_MAP_SHARED,
 169         XFS_RMAP_UNMAP,
 170         XFS_RMAP_UNMAP_SHARED,
 171         XFS_RMAP_CONVERT,
 172         XFS_RMAP_CONVERT_SHARED,
 173         XFS_RMAP_ALLOC,
 174         XFS_RMAP_FREE,
 175 };
 176
 177 struct xfs_rmap_intent {
 178         struct list_head                        ri_list;
 179         enum xfs_rmap_intent_type               ri_type;
 180         __uint64_t                              ri_owner;
 181         int                                     ri_whichfork;
 182         struct xfs_bmbt_irec                    ri_bmap;
 183 };
 184
 185 #endif  /* __XFS_RMAP_H__ */