1 /* 2 * Copyright (c) 2000-2006 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_BMAP_H__ 19 #define __XFS_BMAP_H__ 20 21 struct getbmap; 22 struct xfs_bmbt_irec; 23 struct xfs_ifork; 24 struct xfs_inode; 25 struct xfs_mount; 26 struct xfs_trans; 27 28 extern kmem_zone_t *xfs_bmap_free_item_zone; 29 30 /* 31 * Argument structure for xfs_bmap_alloc. 32 */ 33 struct xfs_bmalloca { 34 xfs_fsblock_t *firstblock; /* i/o first block allocated */ 35 struct xfs_defer_ops *dfops; /* bmap freelist */ 36 struct xfs_trans *tp; /* transaction pointer */ 37 struct xfs_inode *ip; /* incore inode pointer */ 38 struct xfs_bmbt_irec prev; /* extent before the new one */ 39 struct xfs_bmbt_irec got; /* extent after, or delayed */ 40 41 xfs_fileoff_t offset; /* offset in file filling in */ 42 xfs_extlen_t length; /* i/o length asked/allocated */ 43 xfs_fsblock_t blkno; /* starting block of new extent */ 44 45 struct xfs_btree_cur *cur; /* btree cursor */ 46 struct xfs_iext_cursor icur; /* incore extent cursor */ 47 int nallocs;/* number of extents alloc'd */ 48 int logflags;/* flags for transaction logging */ 49 50 xfs_extlen_t total; /* total blocks needed for xaction */ 51 xfs_extlen_t minlen; /* minimum allocation size (blocks) */ 52 xfs_extlen_t minleft; /* amount must be left after alloc */ 53 bool eof; /* set if allocating past last extent */ 54 bool wasdel; /* replacing a delayed allocation */ 55 bool aeof; /* allocated space at eof */ 56 bool conv; /* overwriting unwritten extents */ 57 int datatype;/* data type being allocated */ 58 int flags; 59 }; 60 61 /* 62 * List of extents to be free "later". 63 * The list is kept sorted on xbf_startblock. 64 */ 65 struct xfs_extent_free_item 66 { 67 xfs_fsblock_t xefi_startblock;/* starting fs block number */ 68 xfs_extlen_t xefi_blockcount;/* number of blocks in extent */ 69 struct list_head xefi_list; 70 struct xfs_owner_info xefi_oinfo; /* extent owner */ 71 }; 72 73 #define XFS_BMAP_MAX_NMAP 4 74 75 /* 76 * Flags for xfs_bmapi_* 77 */ 78 #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */ 79 #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */ 80 #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */ 81 #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */ 82 #define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */ 83 /* combine contig. space */ 84 #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */ 85 /* 86 * unwritten extent conversion - this needs write cache flushing and no additional 87 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts 88 * from written to unwritten, otherwise convert from unwritten to written. 89 */ 90 #define XFS_BMAPI_CONVERT 0x040 91 92 /* 93 * allocate zeroed extents - this requires all newly allocated user data extents 94 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set. 95 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found 96 * during the allocation range to zeroed written extents. 97 */ 98 #define XFS_BMAPI_ZERO 0x080 99 100 /* 101 * Map the inode offset to the block given in ap->firstblock. Primarily 102 * used for reflink. The range must be in a hole, and this flag cannot be 103 * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork. 104 * 105 * For bunmapi, this flag unmaps the range without adjusting quota, reducing 106 * refcount, or freeing the blocks. 107 */ 108 #define XFS_BMAPI_REMAP 0x100 109 110 /* Map something in the CoW fork. */ 111 #define XFS_BMAPI_COWFORK 0x200 112 113 /* Only convert delalloc space, don't allocate entirely new extents */ 114 #define XFS_BMAPI_DELALLOC 0x400 115 116 /* Only convert unwritten extents, don't allocate new blocks */ 117 #define XFS_BMAPI_CONVERT_ONLY 0x800 118 119 #define XFS_BMAPI_FLAGS \ 120 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ 121 { XFS_BMAPI_METADATA, "METADATA" }, \ 122 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ 123 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ 124 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ 125 { XFS_BMAPI_CONTIG, "CONTIG" }, \ 126 { XFS_BMAPI_CONVERT, "CONVERT" }, \ 127 { XFS_BMAPI_ZERO, "ZERO" }, \ 128 { XFS_BMAPI_REMAP, "REMAP" }, \ 129 { XFS_BMAPI_COWFORK, "COWFORK" }, \ 130 { XFS_BMAPI_DELALLOC, "DELALLOC" }, \ 131 { XFS_BMAPI_CONVERT_ONLY, "CONVERT_ONLY" } 132 133 134 static inline int xfs_bmapi_aflag(int w) 135 { 136 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 137 (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0)); 138 } 139 140 static inline int xfs_bmapi_whichfork(int bmapi_flags) 141 { 142 if (bmapi_flags & XFS_BMAPI_COWFORK) 143 return XFS_COW_FORK; 144 else if (bmapi_flags & XFS_BMAPI_ATTRFORK) 145 return XFS_ATTR_FORK; 146 return XFS_DATA_FORK; 147 } 148 149 /* 150 * Special values for xfs_bmbt_irec_t br_startblock field. 151 */ 152 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) 153 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) 154 155 /* 156 * Flags for xfs_bmap_add_extent*. 157 */ 158 #define BMAP_LEFT_CONTIG (1 << 0) 159 #define BMAP_RIGHT_CONTIG (1 << 1) 160 #define BMAP_LEFT_FILLING (1 << 2) 161 #define BMAP_RIGHT_FILLING (1 << 3) 162 #define BMAP_LEFT_DELAY (1 << 4) 163 #define BMAP_RIGHT_DELAY (1 << 5) 164 #define BMAP_LEFT_VALID (1 << 6) 165 #define BMAP_RIGHT_VALID (1 << 7) 166 #define BMAP_ATTRFORK (1 << 8) 167 #define BMAP_COWFORK (1 << 9) 168 169 #define XFS_BMAP_EXT_FLAGS \ 170 { BMAP_LEFT_CONTIG, "LC" }, \ 171 { BMAP_RIGHT_CONTIG, "RC" }, \ 172 { BMAP_LEFT_FILLING, "LF" }, \ 173 { BMAP_RIGHT_FILLING, "RF" }, \ 174 { BMAP_ATTRFORK, "ATTR" }, \ 175 { BMAP_COWFORK, "COW" } 176 177 178 /* 179 * Return true if the extent is a real, allocated extent, or false if it is a 180 * delayed allocation, and unwritten extent or a hole. 181 */ 182 static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec) 183 { 184 return irec->br_state != XFS_EXT_UNWRITTEN && 185 irec->br_startblock != HOLESTARTBLOCK && 186 irec->br_startblock != DELAYSTARTBLOCK && 187 !isnullstartblock(irec->br_startblock); 188 } 189 190 void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno, 191 xfs_filblks_t len); 192 void xfs_trim_extent_eof(struct xfs_bmbt_irec *, struct xfs_inode *); 193 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); 194 void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); 195 void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops, 196 xfs_fsblock_t bno, xfs_filblks_t len, 197 struct xfs_owner_info *oinfo); 198 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); 199 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, 200 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); 201 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, 202 xfs_fileoff_t *last_block, int whichfork); 203 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, 204 int whichfork); 205 int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); 206 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, 207 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 208 int *nmap, int flags); 209 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, 210 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 211 xfs_fsblock_t *firstblock, xfs_extlen_t total, 212 struct xfs_bmbt_irec *mval, int *nmap, 213 struct xfs_defer_ops *dfops); 214 int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 215 xfs_fileoff_t bno, xfs_filblks_t *rlen, int flags, 216 xfs_extnum_t nexts, xfs_fsblock_t *firstblock, 217 struct xfs_defer_ops *dfops); 218 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 219 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 220 xfs_extnum_t nexts, xfs_fsblock_t *firstblock, 221 struct xfs_defer_ops *dfops, int *done); 222 int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork, 223 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got, 224 struct xfs_bmbt_irec *del); 225 void xfs_bmap_del_extent_cow(struct xfs_inode *ip, 226 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got, 227 struct xfs_bmbt_irec *del); 228 uint xfs_default_attroffset(struct xfs_inode *ip); 229 int xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip, 230 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 231 bool *done, xfs_fsblock_t *firstblock, 232 struct xfs_defer_ops *dfops); 233 int xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip, 234 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 235 bool *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, 236 struct xfs_defer_ops *dfops); 237 int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset); 238 int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork, 239 xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc, 240 struct xfs_bmbt_irec *got, struct xfs_iext_cursor *cur, 241 int eof); 242 243 enum xfs_bmap_intent_type { 244 XFS_BMAP_MAP = 1, 245 XFS_BMAP_UNMAP, 246 }; 247 248 struct xfs_bmap_intent { 249 struct list_head bi_list; 250 enum xfs_bmap_intent_type bi_type; 251 struct xfs_inode *bi_owner; 252 int bi_whichfork; 253 struct xfs_bmbt_irec bi_bmap; 254 }; 255 256 int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_defer_ops *dfops, 257 struct xfs_inode *ip, enum xfs_bmap_intent_type type, 258 int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock, 259 xfs_filblks_t *blockcount, xfs_exntst_t state); 260 int xfs_bmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, 261 struct xfs_inode *ip, struct xfs_bmbt_irec *imap); 262 int xfs_bmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, 263 struct xfs_inode *ip, struct xfs_bmbt_irec *imap); 264 265 static inline int xfs_bmap_fork_to_state(int whichfork) 266 { 267 switch (whichfork) { 268 case XFS_ATTR_FORK: 269 return BMAP_ATTRFORK; 270 case XFS_COW_FORK: 271 return BMAP_COWFORK; 272 default: 273 return 0; 274 } 275 } 276 277 xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork, 278 struct xfs_bmbt_irec *irec); 279 280 #endif /* __XFS_BMAP_H__ */ 281