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 bool xefi_skip_discard; 72 }; 73 74 #define XFS_BMAP_MAX_NMAP 4 75 76 /* 77 * Flags for xfs_bmapi_* 78 */ 79 #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */ 80 #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */ 81 #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */ 82 #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */ 83 #define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */ 84 /* combine contig. space */ 85 #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */ 86 /* 87 * unwritten extent conversion - this needs write cache flushing and no additional 88 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts 89 * from written to unwritten, otherwise convert from unwritten to written. 90 */ 91 #define XFS_BMAPI_CONVERT 0x040 92 93 /* 94 * allocate zeroed extents - this requires all newly allocated user data extents 95 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set. 96 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found 97 * during the allocation range to zeroed written extents. 98 */ 99 #define XFS_BMAPI_ZERO 0x080 100 101 /* 102 * Map the inode offset to the block given in ap->firstblock. Primarily 103 * used for reflink. The range must be in a hole, and this flag cannot be 104 * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork. 105 * 106 * For bunmapi, this flag unmaps the range without adjusting quota, reducing 107 * refcount, or freeing the blocks. 108 */ 109 #define XFS_BMAPI_REMAP 0x100 110 111 /* Map something in the CoW fork. */ 112 #define XFS_BMAPI_COWFORK 0x200 113 114 /* Only convert delalloc space, don't allocate entirely new extents */ 115 #define XFS_BMAPI_DELALLOC 0x400 116 117 /* Only convert unwritten extents, don't allocate new blocks */ 118 #define XFS_BMAPI_CONVERT_ONLY 0x800 119 120 /* Skip online discard of freed extents */ 121 #define XFS_BMAPI_NODISCARD 0x1000 122 123 /* Do not update the rmap btree. Used for reconstructing bmbt from rmapbt. */ 124 #define XFS_BMAPI_NORMAP 0x2000 125 126 #define XFS_BMAPI_FLAGS \ 127 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ 128 { XFS_BMAPI_METADATA, "METADATA" }, \ 129 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ 130 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ 131 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ 132 { XFS_BMAPI_CONTIG, "CONTIG" }, \ 133 { XFS_BMAPI_CONVERT, "CONVERT" }, \ 134 { XFS_BMAPI_ZERO, "ZERO" }, \ 135 { XFS_BMAPI_REMAP, "REMAP" }, \ 136 { XFS_BMAPI_COWFORK, "COWFORK" }, \ 137 { XFS_BMAPI_DELALLOC, "DELALLOC" }, \ 138 { XFS_BMAPI_CONVERT_ONLY, "CONVERT_ONLY" }, \ 139 { XFS_BMAPI_NODISCARD, "NODISCARD" }, \ 140 { XFS_BMAPI_NORMAP, "NORMAP" } 141 142 143 static inline int xfs_bmapi_aflag(int w) 144 { 145 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 146 (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0)); 147 } 148 149 static inline int xfs_bmapi_whichfork(int bmapi_flags) 150 { 151 if (bmapi_flags & XFS_BMAPI_COWFORK) 152 return XFS_COW_FORK; 153 else if (bmapi_flags & XFS_BMAPI_ATTRFORK) 154 return XFS_ATTR_FORK; 155 return XFS_DATA_FORK; 156 } 157 158 /* 159 * Special values for xfs_bmbt_irec_t br_startblock field. 160 */ 161 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) 162 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) 163 164 /* 165 * Flags for xfs_bmap_add_extent*. 166 */ 167 #define BMAP_LEFT_CONTIG (1 << 0) 168 #define BMAP_RIGHT_CONTIG (1 << 1) 169 #define BMAP_LEFT_FILLING (1 << 2) 170 #define BMAP_RIGHT_FILLING (1 << 3) 171 #define BMAP_LEFT_DELAY (1 << 4) 172 #define BMAP_RIGHT_DELAY (1 << 5) 173 #define BMAP_LEFT_VALID (1 << 6) 174 #define BMAP_RIGHT_VALID (1 << 7) 175 #define BMAP_ATTRFORK (1 << 8) 176 #define BMAP_COWFORK (1 << 9) 177 178 #define XFS_BMAP_EXT_FLAGS \ 179 { BMAP_LEFT_CONTIG, "LC" }, \ 180 { BMAP_RIGHT_CONTIG, "RC" }, \ 181 { BMAP_LEFT_FILLING, "LF" }, \ 182 { BMAP_RIGHT_FILLING, "RF" }, \ 183 { BMAP_ATTRFORK, "ATTR" }, \ 184 { BMAP_COWFORK, "COW" } 185 186 187 /* 188 * Return true if the extent is a real, allocated extent, or false if it is a 189 * delayed allocation, and unwritten extent or a hole. 190 */ 191 static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec) 192 { 193 return irec->br_state != XFS_EXT_UNWRITTEN && 194 irec->br_startblock != HOLESTARTBLOCK && 195 irec->br_startblock != DELAYSTARTBLOCK && 196 !isnullstartblock(irec->br_startblock); 197 } 198 199 void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno, 200 xfs_filblks_t len); 201 void xfs_trim_extent_eof(struct xfs_bmbt_irec *, struct xfs_inode *); 202 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); 203 void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); 204 void __xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops, 205 xfs_fsblock_t bno, xfs_filblks_t len, 206 struct xfs_owner_info *oinfo, bool skip_discard); 207 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); 208 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, 209 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); 210 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, 211 xfs_fileoff_t *last_block, int whichfork); 212 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, 213 int whichfork); 214 int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); 215 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, 216 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 217 int *nmap, int flags); 218 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, 219 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 220 xfs_fsblock_t *firstblock, xfs_extlen_t total, 221 struct xfs_bmbt_irec *mval, int *nmap, 222 struct xfs_defer_ops *dfops); 223 int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 224 xfs_fileoff_t bno, xfs_filblks_t *rlen, int flags, 225 xfs_extnum_t nexts, xfs_fsblock_t *firstblock, 226 struct xfs_defer_ops *dfops); 227 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 228 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 229 xfs_extnum_t nexts, xfs_fsblock_t *firstblock, 230 struct xfs_defer_ops *dfops, int *done); 231 int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork, 232 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got, 233 struct xfs_bmbt_irec *del); 234 void xfs_bmap_del_extent_cow(struct xfs_inode *ip, 235 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got, 236 struct xfs_bmbt_irec *del); 237 uint xfs_default_attroffset(struct xfs_inode *ip); 238 int xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip, 239 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 240 bool *done, xfs_fsblock_t *firstblock, 241 struct xfs_defer_ops *dfops); 242 int xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip, 243 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 244 bool *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, 245 struct xfs_defer_ops *dfops); 246 int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset); 247 int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork, 248 xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc, 249 struct xfs_bmbt_irec *got, struct xfs_iext_cursor *cur, 250 int eof); 251 252 static inline void 253 xfs_bmap_add_free( 254 struct xfs_mount *mp, 255 struct xfs_defer_ops *dfops, 256 xfs_fsblock_t bno, 257 xfs_filblks_t len, 258 struct xfs_owner_info *oinfo) 259 { 260 __xfs_bmap_add_free(mp, dfops, bno, len, oinfo, false); 261 } 262 263 enum xfs_bmap_intent_type { 264 XFS_BMAP_MAP = 1, 265 XFS_BMAP_UNMAP, 266 }; 267 268 struct xfs_bmap_intent { 269 struct list_head bi_list; 270 enum xfs_bmap_intent_type bi_type; 271 struct xfs_inode *bi_owner; 272 int bi_whichfork; 273 struct xfs_bmbt_irec bi_bmap; 274 }; 275 276 int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_defer_ops *dfops, 277 struct xfs_inode *ip, enum xfs_bmap_intent_type type, 278 int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock, 279 xfs_filblks_t *blockcount, xfs_exntst_t state); 280 int xfs_bmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, 281 struct xfs_inode *ip, struct xfs_bmbt_irec *imap); 282 int xfs_bmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, 283 struct xfs_inode *ip, struct xfs_bmbt_irec *imap); 284 285 static inline int xfs_bmap_fork_to_state(int whichfork) 286 { 287 switch (whichfork) { 288 case XFS_ATTR_FORK: 289 return BMAP_ATTRFORK; 290 case XFS_COW_FORK: 291 return BMAP_COWFORK; 292 default: 293 return 0; 294 } 295 } 296 297 xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork, 298 struct xfs_bmbt_irec *irec); 299 300 int xfs_bmapi_remap(struct xfs_trans *tp, struct xfs_inode *ip, 301 xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock, 302 struct xfs_defer_ops *dfops, int flags); 303 304 #endif /* __XFS_BMAP_H__ */ 305