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__ */ 190