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_defer_ops *dfops; /* 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 int datatype;/* data type being allocated */
62 * List of extents to be free "later".
63 * The list is kept sorted on xbf_startblock.
65 struct xfs_extent_free_item
67 xfs_fsblock_t xefi_startblock;/* starting fs block number */
68 xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
69 struct list_head xefi_list;
70 struct xfs_owner_info xefi_oinfo; /* extent owner */
73 #define XFS_BMAP_MAX_NMAP 4
76 * Flags for xfs_bmapi_*
78 #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */
79 #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */
80 #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */
81 #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */
82 #define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */
83 /* combine contig. space */
84 #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */
86 * unwritten extent conversion - this needs write cache flushing and no additional
87 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
88 * from written to unwritten, otherwise convert from unwritten to written.
90 #define XFS_BMAPI_CONVERT 0x040
93 * allocate zeroed extents - this requires all newly allocated user data extents
94 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
95 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
96 * during the allocation range to zeroed written extents.
98 #define XFS_BMAPI_ZERO 0x080
101 * Map the inode offset to the block given in ap->firstblock. Primarily
102 * used for reflink. The range must be in a hole, and this flag cannot be
103 * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
105 #define XFS_BMAPI_REMAP 0x100
107 #define XFS_BMAPI_FLAGS \
108 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \
109 { XFS_BMAPI_METADATA, "METADATA" }, \
110 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
111 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \
112 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \
113 { XFS_BMAPI_CONTIG, "CONTIG" }, \
114 { XFS_BMAPI_CONVERT, "CONVERT" }, \
115 { XFS_BMAPI_ZERO, "ZERO" }, \
116 { XFS_BMAPI_REMAP, "REMAP" }
119 static inline int xfs_bmapi_aflag(int w)
121 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0);
125 * Special values for xfs_bmbt_irec_t br_startblock field.
127 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
128 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
131 * Flags for xfs_bmap_add_extent*.
133 #define BMAP_LEFT_CONTIG (1 << 0)
134 #define BMAP_RIGHT_CONTIG (1 << 1)
135 #define BMAP_LEFT_FILLING (1 << 2)
136 #define BMAP_RIGHT_FILLING (1 << 3)
137 #define BMAP_LEFT_DELAY (1 << 4)
138 #define BMAP_RIGHT_DELAY (1 << 5)
139 #define BMAP_LEFT_VALID (1 << 6)
140 #define BMAP_RIGHT_VALID (1 << 7)
141 #define BMAP_ATTRFORK (1 << 8)
143 #define XFS_BMAP_EXT_FLAGS \
144 { BMAP_LEFT_CONTIG, "LC" }, \
145 { BMAP_RIGHT_CONTIG, "RC" }, \
146 { BMAP_LEFT_FILLING, "LF" }, \
147 { BMAP_RIGHT_FILLING, "RF" }, \
148 { BMAP_ATTRFORK, "ATTR" }
152 * This macro is used to determine how many extents will be shifted
153 * in one write transaction. We could require two splits,
154 * an extent move on the first and an extent merge on the second,
155 * So it is proper that one extent is shifted inside write transaction
158 #define XFS_BMAP_MAX_SHIFT_EXTENTS 1
160 enum shift_direction {
166 void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt,
167 int whichfork, unsigned long caller_ip);
168 #define XFS_BMAP_TRACE_EXLIST(ip,c,w) \
169 xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_)
171 #define XFS_BMAP_TRACE_EXLIST(ip,c,w)
174 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
175 void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
176 void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
177 xfs_fsblock_t bno, xfs_filblks_t len,
178 struct xfs_owner_info *oinfo);
179 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
180 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
181 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
182 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
183 xfs_fileoff_t *last_block, int whichfork);
184 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
186 int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork);
187 int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip,
189 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
190 xfs_filblks_t len, struct xfs_bmbt_irec *mval,
191 int *nmap, int flags);
192 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
193 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
194 xfs_fsblock_t *firstblock, xfs_extlen_t total,
195 struct xfs_bmbt_irec *mval, int *nmap,
196 struct xfs_defer_ops *dfops);
197 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
198 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
199 xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
200 struct xfs_defer_ops *dfops, int *done);
201 int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx,
203 uint xfs_default_attroffset(struct xfs_inode *ip);
204 int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip,
205 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
206 int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock,
207 struct xfs_defer_ops *dfops, enum shift_direction direction,
209 int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset);
210 struct xfs_bmbt_rec_host *
211 xfs_bmap_search_extents(struct xfs_inode *ip, xfs_fileoff_t bno,
212 int fork, int *eofp, xfs_extnum_t *lastxp,
213 struct xfs_bmbt_irec *gotp, struct xfs_bmbt_irec *prevp);
214 int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, xfs_fileoff_t aoff,
215 xfs_filblks_t len, struct xfs_bmbt_irec *got,
216 struct xfs_bmbt_irec *prev, xfs_extnum_t *lastx, int eof);
218 enum xfs_bmap_intent_type {
223 struct xfs_bmap_intent {
224 struct list_head bi_list;
225 enum xfs_bmap_intent_type bi_type;
226 struct xfs_inode *bi_owner;
228 struct xfs_bmbt_irec bi_bmap;
231 #endif /* __XFS_BMAP_H__ */