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1da177e4 | 1 | /* |
3e57ecf6 | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
7b718769 | 3 | * All Rights Reserved. |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 LT |
17 | */ |
18 | #ifndef __XFS_BMAP_H__ | |
19 | #define __XFS_BMAP_H__ | |
20 | ||
21 | struct getbmap; | |
22 | struct xfs_bmbt_irec; | |
4eea22f0 | 23 | struct xfs_ifork; |
1da177e4 LT |
24 | struct xfs_inode; |
25 | struct xfs_mount; | |
26 | struct xfs_trans; | |
27 | ||
a8272ce0 DC |
28 | extern kmem_zone_t *xfs_bmap_free_item_zone; |
29 | ||
9799b438 DC |
30 | /* |
31 | * Argument structure for xfs_bmap_alloc. | |
32 | */ | |
33 | struct xfs_bmalloca { | |
34 | xfs_fsblock_t *firstblock; /* i/o first block allocated */ | |
2c3234d1 | 35 | struct xfs_defer_ops *dfops; /* bmap freelist */ |
9799b438 DC |
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 */ | |
9799b438 DC |
55 | bool aeof; /* allocated space at eof */ |
56 | bool conv; /* overwriting unwritten extents */ | |
292378ed | 57 | int datatype;/* data type being allocated */ |
9799b438 DC |
58 | int flags; |
59 | }; | |
60 | ||
1da177e4 LT |
61 | /* |
62 | * List of extents to be free "later". | |
63 | * The list is kept sorted on xbf_startblock. | |
64 | */ | |
310a75a3 | 65 | struct xfs_extent_free_item |
1da177e4 | 66 | { |
310a75a3 DW |
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; | |
340785cc | 70 | struct xfs_owner_info xefi_oinfo; /* extent owner */ |
e66a4c67 | 71 | }; |
1da177e4 | 72 | |
1da177e4 LT |
73 | #define XFS_BMAP_MAX_NMAP 4 |
74 | ||
75 | /* | |
c0dc7828 | 76 | * Flags for xfs_bmapi_* |
1da177e4 | 77 | */ |
c0dc7828 DC |
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 - */ | |
1da177e4 | 83 | /* combine contig. space */ |
c0dc7828 | 84 | #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */ |
44722352 DC |
85 | /* |
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. | |
89 | */ | |
c0dc7828 | 90 | #define XFS_BMAPI_CONVERT 0x040 |
1da177e4 | 91 | |
3fbbbea3 DC |
92 | /* |
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. | |
97 | */ | |
98 | #define XFS_BMAPI_ZERO 0x080 | |
99 | ||
f65306ea DW |
100 | /* |
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. | |
4847acf8 DW |
104 | * |
105 | * For bunmapi, this flag unmaps the range without adjusting quota, reducing | |
106 | * refcount, or freeing the blocks. | |
f65306ea DW |
107 | */ |
108 | #define XFS_BMAPI_REMAP 0x100 | |
109 | ||
3993baeb DW |
110 | /* Map something in the CoW fork. */ |
111 | #define XFS_BMAPI_COWFORK 0x200 | |
112 | ||
d2b3964a CH |
113 | /* Only convert delalloc space, don't allocate entirely new extents */ |
114 | #define XFS_BMAPI_DELALLOC 0x400 | |
115 | ||
0b1b213f | 116 | #define XFS_BMAPI_FLAGS \ |
0b1b213f CH |
117 | { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ |
118 | { XFS_BMAPI_METADATA, "METADATA" }, \ | |
0b1b213f | 119 | { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ |
0b1b213f CH |
120 | { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ |
121 | { XFS_BMAPI_IGSTATE, "IGSTATE" }, \ | |
122 | { XFS_BMAPI_CONTIG, "CONTIG" }, \ | |
3fbbbea3 | 123 | { XFS_BMAPI_CONVERT, "CONVERT" }, \ |
f65306ea | 124 | { XFS_BMAPI_ZERO, "ZERO" }, \ |
3993baeb | 125 | { XFS_BMAPI_REMAP, "REMAP" }, \ |
d2b3964a CH |
126 | { XFS_BMAPI_COWFORK, "COWFORK" }, \ |
127 | { XFS_BMAPI_DELALLOC, "DELALLOC" } | |
0b1b213f CH |
128 | |
129 | ||
a844f451 NS |
130 | static inline int xfs_bmapi_aflag(int w) |
131 | { | |
3993baeb DW |
132 | return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : |
133 | (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0)); | |
134 | } | |
135 | ||
136 | static inline int xfs_bmapi_whichfork(int bmapi_flags) | |
137 | { | |
138 | if (bmapi_flags & XFS_BMAPI_COWFORK) | |
139 | return XFS_COW_FORK; | |
140 | else if (bmapi_flags & XFS_BMAPI_ATTRFORK) | |
141 | return XFS_ATTR_FORK; | |
142 | return XFS_DATA_FORK; | |
a844f451 | 143 | } |
1da177e4 LT |
144 | |
145 | /* | |
146 | * Special values for xfs_bmbt_irec_t br_startblock field. | |
147 | */ | |
148 | #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) | |
149 | #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) | |
150 | ||
7574aa92 CH |
151 | /* |
152 | * Flags for xfs_bmap_add_extent*. | |
153 | */ | |
154 | #define BMAP_LEFT_CONTIG (1 << 0) | |
155 | #define BMAP_RIGHT_CONTIG (1 << 1) | |
156 | #define BMAP_LEFT_FILLING (1 << 2) | |
157 | #define BMAP_RIGHT_FILLING (1 << 3) | |
158 | #define BMAP_LEFT_DELAY (1 << 4) | |
159 | #define BMAP_RIGHT_DELAY (1 << 5) | |
160 | #define BMAP_LEFT_VALID (1 << 6) | |
161 | #define BMAP_RIGHT_VALID (1 << 7) | |
6ef35544 | 162 | #define BMAP_ATTRFORK (1 << 8) |
3993baeb | 163 | #define BMAP_COWFORK (1 << 9) |
7574aa92 | 164 | |
0b1b213f CH |
165 | #define XFS_BMAP_EXT_FLAGS \ |
166 | { BMAP_LEFT_CONTIG, "LC" }, \ | |
167 | { BMAP_RIGHT_CONTIG, "RC" }, \ | |
168 | { BMAP_LEFT_FILLING, "LF" }, \ | |
169 | { BMAP_RIGHT_FILLING, "RF" }, \ | |
3993baeb DW |
170 | { BMAP_ATTRFORK, "ATTR" }, \ |
171 | { BMAP_COWFORK, "COW" } | |
1da177e4 | 172 | |
e1d8fb88 | 173 | |
9c4f29d3 CH |
174 | /* |
175 | * Return true if the extent is a real, allocated extent, or false if it is a | |
176 | * delayed allocation, and unwritten extent or a hole. | |
177 | */ | |
178 | static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec) | |
179 | { | |
180 | return irec->br_state != XFS_EXT_UNWRITTEN && | |
181 | irec->br_startblock != HOLESTARTBLOCK && | |
182 | irec->br_startblock != DELAYSTARTBLOCK && | |
183 | !isnullstartblock(irec->br_startblock); | |
184 | } | |
185 | ||
e1d8fb88 NJ |
186 | /* |
187 | * This macro is used to determine how many extents will be shifted | |
188 | * in one write transaction. We could require two splits, | |
189 | * an extent move on the first and an extent merge on the second, | |
190 | * So it is proper that one extent is shifted inside write transaction | |
191 | * at a time. | |
192 | */ | |
193 | #define XFS_BMAP_MAX_SHIFT_EXTENTS 1 | |
194 | ||
a904b1ca NJ |
195 | enum shift_direction { |
196 | SHIFT_LEFT = 0, | |
197 | SHIFT_RIGHT, | |
198 | }; | |
199 | ||
b49a0c18 | 200 | #ifdef DEBUG |
d952e2f8 CH |
201 | void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt, |
202 | int whichfork, unsigned long caller_ip); | |
3a59c94c | 203 | #define XFS_BMAP_TRACE_EXLIST(ip,c,w) \ |
0b1b213f CH |
204 | xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_) |
205 | #else | |
3a59c94c | 206 | #define XFS_BMAP_TRACE_EXLIST(ip,c,w) |
0b1b213f | 207 | #endif |
1da177e4 | 208 | |
0a0af28c DW |
209 | void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno, |
210 | xfs_filblks_t len); | |
d952e2f8 | 211 | int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); |
f3508bcd | 212 | void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork); |
2c3234d1 | 213 | void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops, |
340785cc DW |
214 | xfs_fsblock_t bno, xfs_filblks_t len, |
215 | struct xfs_owner_info *oinfo); | |
d952e2f8 CH |
216 | void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); |
217 | int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, | |
218 | xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); | |
219 | int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, | |
220 | xfs_fileoff_t *last_block, int whichfork); | |
7fb2cd4d ES |
221 | int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, |
222 | int whichfork); | |
d952e2f8 CH |
223 | int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork); |
224 | int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip, | |
225 | int whichfork); | |
5c8ed202 DC |
226 | int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno, |
227 | xfs_filblks_t len, struct xfs_bmbt_irec *mval, | |
228 | int *nmap, int flags); | |
c0dc7828 DC |
229 | int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, |
230 | xfs_fileoff_t bno, xfs_filblks_t len, int flags, | |
231 | xfs_fsblock_t *firstblock, xfs_extlen_t total, | |
232 | struct xfs_bmbt_irec *mval, int *nmap, | |
2c3234d1 | 233 | struct xfs_defer_ops *dfops); |
4453593b DW |
234 | int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, |
235 | xfs_fileoff_t bno, xfs_filblks_t *rlen, int flags, | |
236 | xfs_extnum_t nexts, xfs_fsblock_t *firstblock, | |
237 | struct xfs_defer_ops *dfops); | |
d952e2f8 CH |
238 | int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, |
239 | xfs_fileoff_t bno, xfs_filblks_t len, int flags, | |
240 | xfs_extnum_t nexts, xfs_fsblock_t *firstblock, | |
2c3234d1 | 241 | struct xfs_defer_ops *dfops, int *done); |
fa5c836c CH |
242 | int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork, |
243 | xfs_extnum_t *idx, struct xfs_bmbt_irec *got, | |
244 | struct xfs_bmbt_irec *del); | |
245 | void xfs_bmap_del_extent_cow(struct xfs_inode *ip, xfs_extnum_t *idx, | |
246 | struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *del); | |
d952e2f8 CH |
247 | int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx, |
248 | xfs_extnum_t num); | |
249 | uint xfs_default_attroffset(struct xfs_inode *ip); | |
e1d8fb88 | 250 | int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip, |
a904b1ca NJ |
251 | xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb, |
252 | int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock, | |
2c3234d1 | 253 | struct xfs_defer_ops *dfops, enum shift_direction direction, |
a904b1ca NJ |
254 | int num_exts); |
255 | int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset); | |
be51f811 | 256 | int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork, |
974ae922 | 257 | xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc, |
65c5f419 | 258 | struct xfs_bmbt_irec *got, xfs_extnum_t *lastx, int eof); |
1a5902c5 | 259 | |
77d61fe4 DW |
260 | enum xfs_bmap_intent_type { |
261 | XFS_BMAP_MAP = 1, | |
262 | XFS_BMAP_UNMAP, | |
263 | }; | |
264 | ||
265 | struct xfs_bmap_intent { | |
266 | struct list_head bi_list; | |
267 | enum xfs_bmap_intent_type bi_type; | |
268 | struct xfs_inode *bi_owner; | |
269 | int bi_whichfork; | |
270 | struct xfs_bmbt_irec bi_bmap; | |
271 | }; | |
272 | ||
9f3afb57 DW |
273 | int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_defer_ops *dfops, |
274 | struct xfs_inode *ip, enum xfs_bmap_intent_type type, | |
275 | int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock, | |
276 | xfs_filblks_t blockcount, xfs_exntst_t state); | |
277 | int xfs_bmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, | |
278 | struct xfs_inode *ip, struct xfs_bmbt_irec *imap); | |
279 | int xfs_bmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops, | |
280 | struct xfs_inode *ip, struct xfs_bmbt_irec *imap); | |
281 | ||
1da177e4 | 282 | #endif /* __XFS_BMAP_H__ */ |