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 xfs_extnum_t idx; /* current extent index */ 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 #define XFS_BMAPI_FLAGS \ 114 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ 115 { XFS_BMAPI_METADATA, "METADATA" }, \ 116 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ 117 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ 118 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ 119 { XFS_BMAPI_CONTIG, "CONTIG" }, \ 120 { XFS_BMAPI_CONVERT, "CONVERT" }, \ 121 { XFS_BMAPI_ZERO, "ZERO" }, \ 122 { XFS_BMAPI_REMAP, "REMAP" }, \ 123 { XFS_BMAPI_COWFORK, "COWFORK" } 124 125 126 static inline int xfs_bmapi_aflag(int w) 127 { 128 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 129 (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0)); 130 } 131 132 static inline int xfs_bmapi_whichfork(int bmapi_flags) 133 { 134 if (bmapi_flags & XFS_BMAPI_COWFORK) 135 return XFS_COW_FORK; 136 else if (bmapi_flags & XFS_BMAPI_ATTRFORK) 137 return XFS_ATTR_FORK; 138 return XFS_DATA_FORK; 139 } 140 141 /* 142 * Special values for xfs_bmbt_irec_t br_startblock field. 143 */ 144 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) 145 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) 146 147 /* 148 * Flags for xfs_bmap_add_extent*. 149 */ 150 #define BMAP_LEFT_CONTIG (1 << 0) 151 #define BMAP_RIGHT_CONTIG (1 << 1) 152 #define BMAP_LEFT_FILLING (1 << 2) 153 #define BMAP_RIGHT_FILLING (1 << 3) 154 #define BMAP_LEFT_DELAY (1 << 4) 155 #define BMAP_RIGHT_DELAY (1 << 5) 156 #define BMAP_LEFT_VALID (1 << 6) 157 #define BMAP_RIGHT_VALID (1 << 7) 158 #define BMAP_ATTRFORK (1 << 8) 159 #define BMAP_COWFORK (1 << 9) 160 161 #define XFS_BMAP_EXT_FLAGS \ 162 { BMAP_LEFT_CONTIG, "LC" }, \ 163 { BMAP_RIGHT_CONTIG, "RC" }, \ 164 { BMAP_LEFT_FILLING, "LF" }, \ 165 { BMAP_RIGHT_FILLING, "RF" }, \ 166 { BMAP_ATTRFORK, "ATTR" }, \ 167 { BMAP_COWFORK, "COW" } 168 169 170 /* 171 * This macro is used to determine how many extents will be shifted 172 * in one write transaction. We could require two splits, 173 * an extent move on the first and an extent merge on the second, 174 * So it is proper that one extent is shifted inside write transaction 175 * at a time. 176 */ 177 #define XFS_BMAP_MAX_SHIFT_EXTENTS 1 178 179 enum shift_direction { 180 SHIFT_LEFT = 0, 181 SHIFT_RIGHT, 182 }; 183 184 #ifdef DEBUG 185 void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt, 186 int whichfork, unsigned long caller_ip); 187 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) \ 188 xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_) 189 #else 190 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) 191 #endif 192 193 void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno, 194 xfs_filblks_t len); 195 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); 196 void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); 197 void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops, 198 xfs_fsblock_t bno, xfs_filblks_t len, 199 struct xfs_owner_info *oinfo); 200 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); 201 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, 202 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); 203 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, 204 xfs_fileoff_t *last_block, int whichfork); 205 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, 206 int whichfork); 207 int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); 208 int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip, 209 int whichfork); 210 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, 211 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 212 int *nmap, int flags); 213 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, 214 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 215 xfs_fsblock_t *firstblock, xfs_extlen_t total, 216 struct xfs_bmbt_irec *mval, int *nmap, 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 *rlen, int flags, 220 xfs_extnum_t nexts, xfs_fsblock_t *firstblock, 221 struct xfs_defer_ops *dfops); 222 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 223 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 224 xfs_extnum_t nexts, xfs_fsblock_t *firstblock, 225 struct xfs_defer_ops *dfops, int *done); 226 int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork, 227 xfs_extnum_t *idx, struct xfs_bmbt_irec *got, 228 struct xfs_bmbt_irec *del); 229 void xfs_bmap_del_extent_cow(struct xfs_inode *ip, xfs_extnum_t *idx, 230 struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *del); 231 int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, 232 xfs_extnum_t num); 233 uint xfs_default_attroffset(struct xfs_inode *ip); 234 int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, 235 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 236 int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, 237 struct xfs_defer_ops *dfops, enum shift_direction direction, 238 int num_exts); 239 int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset); 240 int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork, 241 xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc, 242 struct xfs_bmbt_irec *got, xfs_extnum_t *lastx, int eof); 243 244 enum xfs_bmap_intent_type { 245 XFS_BMAP_MAP = 1, 246 XFS_BMAP_UNMAP, 247 }; 248 249 struct xfs_bmap_intent { 250 struct list_head bi_list; 251 enum xfs_bmap_intent_type bi_type; 252 struct xfs_inode *bi_owner; 253 int bi_whichfork; 254 struct xfs_bmbt_irec bi_bmap; 255 }; 256 257 int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_defer_ops *dfops, 258 struct xfs_inode *ip, enum xfs_bmap_intent_type type, 259 int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock, 260 xfs_filblks_t blockcount, xfs_exntst_t state); 261 int xfs_bmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, 262 struct xfs_inode *ip, struct xfs_bmbt_irec *imap); 263 int xfs_bmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, 264 struct xfs_inode *ip, struct xfs_bmbt_irec *imap); 265 266 #endif /* __XFS_BMAP_H__ */ 267