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_bmap_free *flist; /* 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 char userdata;/* userdata mask */ 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 typedef struct xfs_bmap_free_item 66 { 67 xfs_fsblock_t xbfi_startblock;/* starting fs block number */ 68 xfs_extlen_t xbfi_blockcount;/* number of blocks in extent */ 69 struct xfs_bmap_free_item *xbfi_next; /* link to next entry */ 70 } xfs_bmap_free_item_t; 71 72 /* 73 * Header for free extent list. 74 * 75 * xbf_low is used by the allocator to activate the lowspace algorithm - 76 * when free space is running low the extent allocator may choose to 77 * allocate an extent from an AG without leaving sufficient space for 78 * a btree split when inserting the new extent. In this case the allocator 79 * will enable the lowspace algorithm which is supposed to allow further 80 * allocations (such as btree splits and newroots) to allocate from 81 * sequential AGs. In order to avoid locking AGs out of order the lowspace 82 * algorithm will start searching for free space from AG 0. If the correct 83 * transaction reservations have been made then this algorithm will eventually 84 * find all the space it needs. 85 */ 86 typedef struct xfs_bmap_free 87 { 88 xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */ 89 int xbf_count; /* count of items on list */ 90 int xbf_low; /* alloc in low mode */ 91 } xfs_bmap_free_t; 92 93 #define XFS_BMAP_MAX_NMAP 4 94 95 /* 96 * Flags for xfs_bmapi_* 97 */ 98 #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */ 99 #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */ 100 #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */ 101 #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */ 102 #define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */ 103 /* combine contig. space */ 104 #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */ 105 /* 106 * unwritten extent conversion - this needs write cache flushing and no additional 107 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts 108 * from written to unwritten, otherwise convert from unwritten to written. 109 */ 110 #define XFS_BMAPI_CONVERT 0x040 111 112 /* 113 * allocate zeroed extents - this requires all newly allocated user data extents 114 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set. 115 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found 116 * during the allocation range to zeroed written extents. 117 */ 118 #define XFS_BMAPI_ZERO 0x080 119 120 #define XFS_BMAPI_FLAGS \ 121 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ 122 { XFS_BMAPI_METADATA, "METADATA" }, \ 123 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ 124 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ 125 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ 126 { XFS_BMAPI_CONTIG, "CONTIG" }, \ 127 { XFS_BMAPI_CONVERT, "CONVERT" }, \ 128 { XFS_BMAPI_ZERO, "ZERO" } 129 130 131 static inline int xfs_bmapi_aflag(int w) 132 { 133 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0); 134 } 135 136 /* 137 * Special values for xfs_bmbt_irec_t br_startblock field. 138 */ 139 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) 140 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) 141 142 static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp) 143 { 144 ((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \ 145 (flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK); 146 } 147 148 /* 149 * Flags for xfs_bmap_add_extent*. 150 */ 151 #define BMAP_LEFT_CONTIG (1 << 0) 152 #define BMAP_RIGHT_CONTIG (1 << 1) 153 #define BMAP_LEFT_FILLING (1 << 2) 154 #define BMAP_RIGHT_FILLING (1 << 3) 155 #define BMAP_LEFT_DELAY (1 << 4) 156 #define BMAP_RIGHT_DELAY (1 << 5) 157 #define BMAP_LEFT_VALID (1 << 6) 158 #define BMAP_RIGHT_VALID (1 << 7) 159 #define BMAP_ATTRFORK (1 << 8) 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" } 167 168 169 /* 170 * This macro is used to determine how many extents will be shifted 171 * in one write transaction. We could require two splits, 172 * an extent move on the first and an extent merge on the second, 173 * So it is proper that one extent is shifted inside write transaction 174 * at a time. 175 */ 176 #define XFS_BMAP_MAX_SHIFT_EXTENTS 1 177 178 enum shift_direction { 179 SHIFT_LEFT = 0, 180 SHIFT_RIGHT, 181 }; 182 183 #ifdef DEBUG 184 void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt, 185 int whichfork, unsigned long caller_ip); 186 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) \ 187 xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_) 188 #else 189 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) 190 #endif 191 192 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); 193 void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); 194 void xfs_bmap_add_free(xfs_fsblock_t bno, xfs_filblks_t len, 195 struct xfs_bmap_free *flist, struct xfs_mount *mp); 196 void xfs_bmap_cancel(struct xfs_bmap_free *flist); 197 int xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist, 198 int *committed); 199 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); 200 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, 201 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); 202 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, 203 xfs_fileoff_t *last_block, int whichfork); 204 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, 205 int whichfork); 206 int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); 207 int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip, 208 int whichfork); 209 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, 210 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 211 int *nmap, int flags); 212 int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno, 213 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 214 int *nmap, int flags); 215 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, 216 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 217 xfs_fsblock_t *firstblock, xfs_extlen_t total, 218 struct xfs_bmbt_irec *mval, int *nmap, 219 struct xfs_bmap_free *flist); 220 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 221 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 222 xfs_extnum_t nexts, xfs_fsblock_t *firstblock, 223 struct xfs_bmap_free *flist, int *done); 224 int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, 225 xfs_extnum_t num); 226 uint xfs_default_attroffset(struct xfs_inode *ip); 227 int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, 228 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 229 int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, 230 struct xfs_bmap_free *flist, enum shift_direction direction, 231 int num_exts); 232 int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset); 233 234 #endif /* __XFS_BMAP_H__ */ 235