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 * List of extents to be free "later". 32 * The list is kept sorted on xbf_startblock. 33 */ 34 typedef struct xfs_bmap_free_item 35 { 36 xfs_fsblock_t xbfi_startblock;/* starting fs block number */ 37 xfs_extlen_t xbfi_blockcount;/* number of blocks in extent */ 38 struct xfs_bmap_free_item *xbfi_next; /* link to next entry */ 39 } xfs_bmap_free_item_t; 40 41 /* 42 * Header for free extent list. 43 * 44 * xbf_low is used by the allocator to activate the lowspace algorithm - 45 * when free space is running low the extent allocator may choose to 46 * allocate an extent from an AG without leaving sufficient space for 47 * a btree split when inserting the new extent. In this case the allocator 48 * will enable the lowspace algorithm which is supposed to allow further 49 * allocations (such as btree splits and newroots) to allocate from 50 * sequential AGs. In order to avoid locking AGs out of order the lowspace 51 * algorithm will start searching for free space from AG 0. If the correct 52 * transaction reservations have been made then this algorithm will eventually 53 * find all the space it needs. 54 */ 55 typedef struct xfs_bmap_free 56 { 57 xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */ 58 int xbf_count; /* count of items on list */ 59 int xbf_low; /* alloc in low mode */ 60 } xfs_bmap_free_t; 61 62 #define XFS_BMAP_MAX_NMAP 4 63 64 /* 65 * Flags for xfs_bmapi_* 66 */ 67 #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */ 68 #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */ 69 #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */ 70 #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */ 71 #define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */ 72 /* combine contig. space */ 73 #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */ 74 /* 75 * unwritten extent conversion - this needs write cache flushing and no additional 76 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts 77 * from written to unwritten, otherwise convert from unwritten to written. 78 */ 79 #define XFS_BMAPI_CONVERT 0x040 80 81 #define XFS_BMAPI_FLAGS \ 82 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ 83 { XFS_BMAPI_METADATA, "METADATA" }, \ 84 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ 85 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ 86 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ 87 { XFS_BMAPI_CONTIG, "CONTIG" }, \ 88 { XFS_BMAPI_CONVERT, "CONVERT" } 89 90 91 static inline int xfs_bmapi_aflag(int w) 92 { 93 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0); 94 } 95 96 /* 97 * Special values for xfs_bmbt_irec_t br_startblock field. 98 */ 99 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) 100 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) 101 102 static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp) 103 { 104 ((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \ 105 (flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK); 106 } 107 108 /* 109 * Flags for xfs_bmap_add_extent*. 110 */ 111 #define BMAP_LEFT_CONTIG (1 << 0) 112 #define BMAP_RIGHT_CONTIG (1 << 1) 113 #define BMAP_LEFT_FILLING (1 << 2) 114 #define BMAP_RIGHT_FILLING (1 << 3) 115 #define BMAP_LEFT_DELAY (1 << 4) 116 #define BMAP_RIGHT_DELAY (1 << 5) 117 #define BMAP_LEFT_VALID (1 << 6) 118 #define BMAP_RIGHT_VALID (1 << 7) 119 #define BMAP_ATTRFORK (1 << 8) 120 121 #define XFS_BMAP_EXT_FLAGS \ 122 { BMAP_LEFT_CONTIG, "LC" }, \ 123 { BMAP_RIGHT_CONTIG, "RC" }, \ 124 { BMAP_LEFT_FILLING, "LF" }, \ 125 { BMAP_RIGHT_FILLING, "RF" }, \ 126 { BMAP_ATTRFORK, "ATTR" } 127 128 129 /* 130 * This macro is used to determine how many extents will be shifted 131 * in one write transaction. We could require two splits, 132 * an extent move on the first and an extent merge on the second, 133 * So it is proper that one extent is shifted inside write transaction 134 * at a time. 135 */ 136 #define XFS_BMAP_MAX_SHIFT_EXTENTS 1 137 138 #ifdef DEBUG 139 void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt, 140 int whichfork, unsigned long caller_ip); 141 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) \ 142 xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_) 143 #else 144 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) 145 #endif 146 147 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); 148 void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); 149 void xfs_bmap_add_free(xfs_fsblock_t bno, xfs_filblks_t len, 150 struct xfs_bmap_free *flist, struct xfs_mount *mp); 151 void xfs_bmap_cancel(struct xfs_bmap_free *flist); 152 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); 153 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, 154 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); 155 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, 156 xfs_fileoff_t *last_block, int whichfork); 157 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, 158 int whichfork); 159 int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); 160 int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip, 161 int whichfork); 162 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, 163 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 164 int *nmap, int flags); 165 int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno, 166 xfs_filblks_t len, struct xfs_bmbt_irec *mval, 167 int *nmap, int flags); 168 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, 169 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 170 xfs_fsblock_t *firstblock, xfs_extlen_t total, 171 struct xfs_bmbt_irec *mval, int *nmap, 172 struct xfs_bmap_free *flist); 173 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, 174 xfs_fileoff_t bno, xfs_filblks_t len, int flags, 175 xfs_extnum_t nexts, xfs_fsblock_t *firstblock, 176 struct xfs_bmap_free *flist, int *done); 177 int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, 178 xfs_extnum_t num); 179 uint xfs_default_attroffset(struct xfs_inode *ip); 180 int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, 181 xfs_fileoff_t start_fsb, xfs_fileoff_t offset_shift_fsb, 182 int *done, xfs_fileoff_t *next_fsb, xfs_fsblock_t *firstblock, 183 struct xfs_bmap_free *flist, int num_exts); 184 185 #endif /* __XFS_BMAP_H__ */ 186