2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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.
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.
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
18 #ifndef __XFS_BMAP_H__
19 #define __XFS_BMAP_H__
28 extern kmem_zone_t *xfs_bmap_free_item_zone;
31 * Argument structure for xfs_bmap_alloc.
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 */
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 */
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 */
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 */
62 * List of extents to be free "later".
63 * The list is kept sorted on xbf_startblock.
65 struct xfs_bmap_free_item
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;
72 #define XFS_BMAP_MAX_NMAP 4
75 * Flags for xfs_bmapi_*
77 #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */
78 #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */
79 #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */
80 #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */
81 #define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */
82 /* combine contig. space */
83 #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */
85 * unwritten extent conversion - this needs write cache flushing and no additional
86 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
87 * from written to unwritten, otherwise convert from unwritten to written.
89 #define XFS_BMAPI_CONVERT 0x040
92 * allocate zeroed extents - this requires all newly allocated user data extents
93 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
94 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
95 * during the allocation range to zeroed written extents.
97 #define XFS_BMAPI_ZERO 0x080
99 #define XFS_BMAPI_FLAGS \
100 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \
101 { XFS_BMAPI_METADATA, "METADATA" }, \
102 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
103 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \
104 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \
105 { XFS_BMAPI_CONTIG, "CONTIG" }, \
106 { XFS_BMAPI_CONVERT, "CONVERT" }, \
107 { XFS_BMAPI_ZERO, "ZERO" }
110 static inline int xfs_bmapi_aflag(int w)
112 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0);
116 * Special values for xfs_bmbt_irec_t br_startblock field.
118 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
119 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
122 * Flags for xfs_bmap_add_extent*.
124 #define BMAP_LEFT_CONTIG (1 << 0)
125 #define BMAP_RIGHT_CONTIG (1 << 1)
126 #define BMAP_LEFT_FILLING (1 << 2)
127 #define BMAP_RIGHT_FILLING (1 << 3)
128 #define BMAP_LEFT_DELAY (1 << 4)
129 #define BMAP_RIGHT_DELAY (1 << 5)
130 #define BMAP_LEFT_VALID (1 << 6)
131 #define BMAP_RIGHT_VALID (1 << 7)
132 #define BMAP_ATTRFORK (1 << 8)
134 #define XFS_BMAP_EXT_FLAGS \
135 { BMAP_LEFT_CONTIG, "LC" }, \
136 { BMAP_RIGHT_CONTIG, "RC" }, \
137 { BMAP_LEFT_FILLING, "LF" }, \
138 { BMAP_RIGHT_FILLING, "RF" }, \
139 { BMAP_ATTRFORK, "ATTR" }
143 * This macro is used to determine how many extents will be shifted
144 * in one write transaction. We could require two splits,
145 * an extent move on the first and an extent merge on the second,
146 * So it is proper that one extent is shifted inside write transaction
149 #define XFS_BMAP_MAX_SHIFT_EXTENTS 1
151 enum shift_direction {
157 void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt,
158 int whichfork, unsigned long caller_ip);
159 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) \
160 xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_)
162 #define XFS_BMAP_TRACE_EXLIST(ip,c,w)
165 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
166 void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
167 void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_bmap_free *flist,
168 xfs_fsblock_t bno, xfs_filblks_t len);
169 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
170 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
171 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
172 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
173 xfs_fileoff_t *last_block, int whichfork);
174 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
176 int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork);
177 int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip,
179 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
180 xfs_filblks_t len, struct xfs_bmbt_irec *mval,
181 int *nmap, int flags);
182 int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno,
183 xfs_filblks_t len, struct xfs_bmbt_irec *mval,
184 int *nmap, int flags);
185 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
186 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
187 xfs_fsblock_t *firstblock, xfs_extlen_t total,
188 struct xfs_bmbt_irec *mval, int *nmap,
189 struct xfs_bmap_free *flist);
190 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
191 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
192 xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
193 struct xfs_bmap_free *flist, int *done);
194 int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx,
196 uint xfs_default_attroffset(struct xfs_inode *ip);
197 int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip,
198 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
199 int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock,
200 struct xfs_bmap_free *flist, enum shift_direction direction,
202 int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset);
204 #endif /* __XFS_BMAP_H__ */