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 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 list_head xbfi_list; 70 }; 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 struct list_head xbf_flist; /* 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 INIT_LIST_HEAD(&flp->xbf_flist); 145 flp->xbf_count = 0; 146 flp->xbf_low = 0; 147 *fbp = NULLFSBLOCK; 148 } 149 150 /* 151 * Flags for xfs_bmap_add_extent*. 152 */ 153 #define BMAP_LEFT_CONTIG (1 << 0) 154 #define BMAP_RIGHT_CONTIG (1 << 1) 155 #define BMAP_LEFT_FILLING (1 << 2) 156 #define BMAP_RIGHT_FILLING (1 << 3) 157 #define BMAP_LEFT_DELAY (1 << 4) 158 #define BMAP_RIGHT_DELAY (1 << 5) 159 #define BMAP_LEFT_VALID (1 << 6) 160 #define BMAP_RIGHT_VALID (1 << 7) 161 #define BMAP_ATTRFORK (1 << 8) 162 163 #define XFS_BMAP_EXT_FLAGS \ 164 { BMAP_LEFT_CONTIG, "LC" }, \ 165 { BMAP_RIGHT_CONTIG, "RC" }, \ 166 { BMAP_LEFT_FILLING, "LF" }, \ 167 { BMAP_RIGHT_FILLING, "RF" }, \ 168 { BMAP_ATTRFORK, "ATTR" } 169 170 171 /* 172 * This macro is used to determine how many extents will be shifted 173 * in one write transaction. We could require two splits, 174 * an extent move on the first and an extent merge on the second, 175 * So it is proper that one extent is shifted inside write transaction 176 * at a time. 177 */ 178 #define XFS_BMAP_MAX_SHIFT_EXTENTS 1 179 180 enum shift_direction { 181 SHIFT_LEFT = 0, 182 SHIFT_RIGHT, 183 }; 184 185 #ifdef DEBUG 186 void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt, 187 int whichfork, unsigned long caller_ip); 188 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) \ 189 xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_) 190 #else 191 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) 192 #endif 193 194 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); 195 void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); 196 void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_bmap_free *flist, 197 xfs_fsblock_t bno, xfs_filblks_t len); 198 void xfs_bmap_cancel(struct xfs_bmap_free *flist); 199 int xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist, 200 struct xfs_inode *ip); 201 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); 202 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, 203 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); 204 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, 205 xfs_fileoff_t *last_block, int whichfork); 206 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, 207 int whichfork); 208 int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); 209 int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip, 210 int whichfork); 211 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, 212 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 213 int *nmap, int flags); 214 int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno, 215 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 216 int *nmap, int flags); 217 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, 218 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 219 xfs_fsblock_t *firstblock, xfs_extlen_t total, 220 struct xfs_bmbt_irec *mval, int *nmap, 221 struct xfs_bmap_free *flist); 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_bmap_free *flist, int *done); 226 int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, 227 xfs_extnum_t num); 228 uint xfs_default_attroffset(struct xfs_inode *ip); 229 int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, 230 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 231 int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, 232 struct xfs_bmap_free *flist, enum shift_direction direction, 233 int num_exts); 234 int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset); 235 236 #endif /* __XFS_BMAP_H__ */ 237