1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2000-2006 Silicon Graphics, Inc. 4 * All Rights Reserved. 5 */ 6 #ifndef __XFS_BMAP_H__ 7 #define __XFS_BMAP_H__ 8 9 struct getbmap; 10 struct xfs_bmbt_irec; 11 struct xfs_ifork; 12 struct xfs_inode; 13 struct xfs_mount; 14 struct xfs_trans; 15 struct xfs_alloc_arg; 16 17 /* 18 * Argument structure for xfs_bmap_alloc. 19 */ 20 struct xfs_bmalloca { 21 struct xfs_trans *tp; /* transaction pointer */ 22 struct xfs_inode *ip; /* incore inode pointer */ 23 struct xfs_bmbt_irec prev; /* extent before the new one */ 24 struct xfs_bmbt_irec got; /* extent after, or delayed */ 25 26 xfs_fileoff_t offset; /* offset in file filling in */ 27 xfs_extlen_t length; /* i/o length asked/allocated */ 28 xfs_fsblock_t blkno; /* starting block of new extent */ 29 30 struct xfs_btree_cur *cur; /* btree cursor */ 31 struct xfs_iext_cursor icur; /* incore extent cursor */ 32 int nallocs;/* number of extents alloc'd */ 33 int logflags;/* flags for transaction logging */ 34 35 xfs_extlen_t total; /* total blocks needed for xaction */ 36 xfs_extlen_t minlen; /* minimum allocation size (blocks) */ 37 xfs_extlen_t minleft; /* amount must be left after alloc */ 38 bool eof; /* set if allocating past last extent */ 39 bool wasdel; /* replacing a delayed allocation */ 40 bool aeof; /* allocated space at eof */ 41 bool conv; /* overwriting unwritten extents */ 42 int datatype;/* data type being allocated */ 43 uint32_t flags; 44 }; 45 46 #define XFS_BMAP_MAX_NMAP 4 47 48 /* 49 * Flags for xfs_bmapi_* 50 */ 51 #define XFS_BMAPI_ENTIRE (1u << 0) /* return entire extent untrimmed */ 52 #define XFS_BMAPI_METADATA (1u << 1) /* mapping metadata not user data */ 53 #define XFS_BMAPI_ATTRFORK (1u << 2) /* use attribute fork not data */ 54 #define XFS_BMAPI_PREALLOC (1u << 3) /* preallocating unwritten space */ 55 #define XFS_BMAPI_CONTIG (1u << 4) /* must allocate only one extent */ 56 /* 57 * unwritten extent conversion - this needs write cache flushing and no additional 58 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts 59 * from written to unwritten, otherwise convert from unwritten to written. 60 */ 61 #define XFS_BMAPI_CONVERT (1u << 5) 62 63 /* 64 * allocate zeroed extents - this requires all newly allocated user data extents 65 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set. 66 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found 67 * during the allocation range to zeroed written extents. 68 */ 69 #define XFS_BMAPI_ZERO (1u << 6) 70 71 /* 72 * Map the inode offset to the block given in ap->firstblock. Primarily 73 * used for reflink. The range must be in a hole, and this flag cannot be 74 * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork. 75 * 76 * For bunmapi, this flag unmaps the range without adjusting quota, reducing 77 * refcount, or freeing the blocks. 78 */ 79 #define XFS_BMAPI_REMAP (1u << 7) 80 81 /* Map something in the CoW fork. */ 82 #define XFS_BMAPI_COWFORK (1u << 8) 83 84 /* Skip online discard of freed extents */ 85 #define XFS_BMAPI_NODISCARD (1u << 9) 86 87 /* Do not update the rmap btree. Used for reconstructing bmbt from rmapbt. */ 88 #define XFS_BMAPI_NORMAP (1u << 10) 89 90 #define XFS_BMAPI_FLAGS \ 91 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ 92 { XFS_BMAPI_METADATA, "METADATA" }, \ 93 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ 94 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ 95 { XFS_BMAPI_CONTIG, "CONTIG" }, \ 96 { XFS_BMAPI_CONVERT, "CONVERT" }, \ 97 { XFS_BMAPI_ZERO, "ZERO" }, \ 98 { XFS_BMAPI_REMAP, "REMAP" }, \ 99 { XFS_BMAPI_COWFORK, "COWFORK" }, \ 100 { XFS_BMAPI_NODISCARD, "NODISCARD" }, \ 101 { XFS_BMAPI_NORMAP, "NORMAP" } 102 103 104 static inline int xfs_bmapi_aflag(int w) 105 { 106 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 107 (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0)); 108 } 109 110 static inline int xfs_bmapi_whichfork(uint32_t bmapi_flags) 111 { 112 if (bmapi_flags & XFS_BMAPI_COWFORK) 113 return XFS_COW_FORK; 114 else if (bmapi_flags & XFS_BMAPI_ATTRFORK) 115 return XFS_ATTR_FORK; 116 return XFS_DATA_FORK; 117 } 118 119 /* 120 * Special values for xfs_bmbt_irec_t br_startblock field. 121 */ 122 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) 123 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) 124 125 /* 126 * Flags for xfs_bmap_add_extent*. 127 */ 128 #define BMAP_LEFT_CONTIG (1u << 0) 129 #define BMAP_RIGHT_CONTIG (1u << 1) 130 #define BMAP_LEFT_FILLING (1u << 2) 131 #define BMAP_RIGHT_FILLING (1u << 3) 132 #define BMAP_LEFT_DELAY (1u << 4) 133 #define BMAP_RIGHT_DELAY (1u << 5) 134 #define BMAP_LEFT_VALID (1u << 6) 135 #define BMAP_RIGHT_VALID (1u << 7) 136 #define BMAP_ATTRFORK (1u << 8) 137 #define BMAP_COWFORK (1u << 9) 138 139 #define XFS_BMAP_EXT_FLAGS \ 140 { BMAP_LEFT_CONTIG, "LC" }, \ 141 { BMAP_RIGHT_CONTIG, "RC" }, \ 142 { BMAP_LEFT_FILLING, "LF" }, \ 143 { BMAP_RIGHT_FILLING, "RF" }, \ 144 { BMAP_ATTRFORK, "ATTR" }, \ 145 { BMAP_COWFORK, "COW" } 146 147 /* Return true if the extent is an allocated extent, written or not. */ 148 static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec) 149 { 150 return irec->br_startblock != HOLESTARTBLOCK && 151 irec->br_startblock != DELAYSTARTBLOCK && 152 !isnullstartblock(irec->br_startblock); 153 } 154 155 /* 156 * Return true if the extent is a real, allocated extent, or false if it is a 157 * delayed allocation, and unwritten extent or a hole. 158 */ 159 static inline bool xfs_bmap_is_written_extent(struct xfs_bmbt_irec *irec) 160 { 161 return xfs_bmap_is_real_extent(irec) && 162 irec->br_state != XFS_EXT_UNWRITTEN; 163 } 164 165 /* 166 * Check the mapping for obviously garbage allocations that could trash the 167 * filesystem immediately. 168 */ 169 #define xfs_valid_startblock(ip, startblock) \ 170 ((startblock) != 0 || XFS_IS_REALTIME_INODE(ip)) 171 172 int xfs_bmap_longest_free_extent(struct xfs_perag *pag, 173 struct xfs_trans *tp, xfs_extlen_t *blen); 174 void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno, 175 xfs_filblks_t len); 176 unsigned int xfs_bmap_compute_attr_offset(struct xfs_mount *mp); 177 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); 178 void xfs_bmap_local_to_extents_empty(struct xfs_trans *tp, 179 struct xfs_inode *ip, int whichfork); 180 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); 181 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, 182 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); 183 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, 184 xfs_fileoff_t *last_block, int whichfork); 185 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, 186 int whichfork); 187 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, 188 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 189 int *nmap, uint32_t flags); 190 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, 191 xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags, 192 xfs_extlen_t total, struct xfs_bmbt_irec *mval, int *nmap); 193 int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 194 xfs_fileoff_t bno, xfs_filblks_t *rlen, uint32_t flags, 195 xfs_extnum_t nexts); 196 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 197 xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags, 198 xfs_extnum_t nexts, int *done); 199 int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork, 200 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got, 201 struct xfs_bmbt_irec *del); 202 void xfs_bmap_del_extent_cow(struct xfs_inode *ip, 203 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got, 204 struct xfs_bmbt_irec *del); 205 uint xfs_default_attroffset(struct xfs_inode *ip); 206 int xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip, 207 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 208 bool *done); 209 int xfs_bmap_can_insert_extents(struct xfs_inode *ip, xfs_fileoff_t off, 210 xfs_fileoff_t shift); 211 int xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip, 212 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 213 bool *done, xfs_fileoff_t stop_fsb); 214 int xfs_bmap_split_extent(struct xfs_trans *tp, struct xfs_inode *ip, 215 xfs_fileoff_t split_offset); 216 int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork, 217 xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc, 218 struct xfs_bmbt_irec *got, struct xfs_iext_cursor *cur, 219 int eof); 220 int xfs_bmapi_convert_delalloc(struct xfs_inode *ip, int whichfork, 221 xfs_off_t offset, struct iomap *iomap, unsigned int *seq); 222 int xfs_bmap_add_extent_unwritten_real(struct xfs_trans *tp, 223 struct xfs_inode *ip, int whichfork, 224 struct xfs_iext_cursor *icur, struct xfs_btree_cur **curp, 225 struct xfs_bmbt_irec *new, int *logflagsp); 226 xfs_extlen_t xfs_bmapi_minleft(struct xfs_trans *tp, struct xfs_inode *ip, 227 int fork); 228 int xfs_bmap_btalloc_low_space(struct xfs_bmalloca *ap, 229 struct xfs_alloc_arg *args); 230 231 enum xfs_bmap_intent_type { 232 XFS_BMAP_MAP = 1, 233 XFS_BMAP_UNMAP, 234 }; 235 236 struct xfs_bmap_intent { 237 struct list_head bi_list; 238 enum xfs_bmap_intent_type bi_type; 239 int bi_whichfork; 240 struct xfs_inode *bi_owner; 241 struct xfs_bmbt_irec bi_bmap; 242 }; 243 244 int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_bmap_intent *bi); 245 void xfs_bmap_map_extent(struct xfs_trans *tp, struct xfs_inode *ip, 246 struct xfs_bmbt_irec *imap); 247 void xfs_bmap_unmap_extent(struct xfs_trans *tp, struct xfs_inode *ip, 248 struct xfs_bmbt_irec *imap); 249 250 static inline uint32_t xfs_bmap_fork_to_state(int whichfork) 251 { 252 switch (whichfork) { 253 case XFS_ATTR_FORK: 254 return BMAP_ATTRFORK; 255 case XFS_COW_FORK: 256 return BMAP_COWFORK; 257 default: 258 return 0; 259 } 260 } 261 262 xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork, 263 struct xfs_bmbt_irec *irec); 264 265 int xfs_bmapi_remap(struct xfs_trans *tp, struct xfs_inode *ip, 266 xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock, 267 uint32_t flags); 268 269 extern struct kmem_cache *xfs_bmap_intent_cache; 270 271 int __init xfs_bmap_intent_init_cache(void); 272 void xfs_bmap_intent_destroy_cache(void); 273 274 #endif /* __XFS_BMAP_H__ */ 275