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 21struct getbmap; 22struct xfs_bmbt_irec; 23struct xfs_ifork; 24struct xfs_inode; 25struct xfs_mount; 26struct xfs_trans; 27 28extern kmem_zone_t *xfs_bmap_free_item_zone; 29 30/* 31 * Argument structure for xfs_bmap_alloc. 32 */ 33struct 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 userdata;/* set if is user data */ 56 bool aeof; /* allocated space at eof */ 57 bool conv; /* overwriting unwritten extents */ 58 int flags; 59}; 60 61/* 62 * List of extents to be free "later". 63 * The list is kept sorted on xbf_startblock. 64 */ 65typedef 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 */ 86typedef 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#define XFS_BMAPI_FLAGS \ 113 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ 114 { XFS_BMAPI_METADATA, "METADATA" }, \ 115 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ 116 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ 117 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ 118 { XFS_BMAPI_CONTIG, "CONTIG" }, \ 119 { XFS_BMAPI_CONVERT, "CONVERT" } 120 121 122static inline int xfs_bmapi_aflag(int w) 123{ 124 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0); 125} 126 127/* 128 * Special values for xfs_bmbt_irec_t br_startblock field. 129 */ 130#define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) 131#define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) 132 133static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp) 134{ 135 ((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \ 136 (flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK); 137} 138 139/* 140 * Flags for xfs_bmap_add_extent*. 141 */ 142#define BMAP_LEFT_CONTIG (1 << 0) 143#define BMAP_RIGHT_CONTIG (1 << 1) 144#define BMAP_LEFT_FILLING (1 << 2) 145#define BMAP_RIGHT_FILLING (1 << 3) 146#define BMAP_LEFT_DELAY (1 << 4) 147#define BMAP_RIGHT_DELAY (1 << 5) 148#define BMAP_LEFT_VALID (1 << 6) 149#define BMAP_RIGHT_VALID (1 << 7) 150#define BMAP_ATTRFORK (1 << 8) 151 152#define XFS_BMAP_EXT_FLAGS \ 153 { BMAP_LEFT_CONTIG, "LC" }, \ 154 { BMAP_RIGHT_CONTIG, "RC" }, \ 155 { BMAP_LEFT_FILLING, "LF" }, \ 156 { BMAP_RIGHT_FILLING, "RF" }, \ 157 { BMAP_ATTRFORK, "ATTR" } 158 159 160/* 161 * This macro is used to determine how many extents will be shifted 162 * in one write transaction. We could require two splits, 163 * an extent move on the first and an extent merge on the second, 164 * So it is proper that one extent is shifted inside write transaction 165 * at a time. 166 */ 167#define XFS_BMAP_MAX_SHIFT_EXTENTS 1 168 169enum shift_direction { 170 SHIFT_LEFT = 0, 171 SHIFT_RIGHT, 172}; 173 174#ifdef DEBUG 175void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt, 176 int whichfork, unsigned long caller_ip); 177#define XFS_BMAP_TRACE_EXLIST(ip,c,w) \ 178 xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_) 179#else 180#define XFS_BMAP_TRACE_EXLIST(ip,c,w) 181#endif 182 183int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); 184void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); 185void xfs_bmap_add_free(xfs_fsblock_t bno, xfs_filblks_t len, 186 struct xfs_bmap_free *flist, struct xfs_mount *mp); 187void xfs_bmap_cancel(struct xfs_bmap_free *flist); 188int xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist, 189 int *committed); 190void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); 191int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, 192 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); 193int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, 194 xfs_fileoff_t *last_block, int whichfork); 195int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, 196 int whichfork); 197int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); 198int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip, 199 int whichfork); 200int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, 201 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 202 int *nmap, int flags); 203int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno, 204 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 205 int *nmap, int flags); 206int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, 207 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 208 xfs_fsblock_t *firstblock, xfs_extlen_t total, 209 struct xfs_bmbt_irec *mval, int *nmap, 210 struct xfs_bmap_free *flist); 211int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 212 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 213 xfs_extnum_t nexts, xfs_fsblock_t *firstblock, 214 struct xfs_bmap_free *flist, int *done); 215int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, 216 xfs_extnum_t num); 217uint xfs_default_attroffset(struct xfs_inode *ip); 218int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, 219 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, 220 int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, 221 struct xfs_bmap_free *flist, enum shift_direction direction, 222 int num_exts); 223int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset); 224 225#endif /* __XFS_BMAP_H__ */ 226