1 /*
2 * Copyright (c) 2000,2002-2005 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_BTREE_H__
19 #define __XFS_BMAP_BTREE_H__
20
21 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
22
23 struct xfs_btree_cur;
24 struct xfs_btree_lblock;
25 struct xfs_mount;
26 struct xfs_inode;
27
28 /*
29 * Bmap root header, on-disk form only.
30 */
31 typedef struct xfs_bmdr_block {
32 __be16 bb_level; /* 0 is a leaf */
33 __be16 bb_numrecs; /* current # of data records */
34 } xfs_bmdr_block_t;
35
36 /*
37 * Bmap btree record and extent descriptor.
38 * l0:63 is an extent flag (value 1 indicates non-normal).
39 * l0:9-62 are startoff.
40 * l0:0-8 and l1:21-63 are startblock.
41 * l1:0-20 are blockcount.
42 */
43 #define BMBT_EXNTFLAG_BITLEN 1
44 #define BMBT_STARTOFF_BITLEN 54
45 #define BMBT_STARTBLOCK_BITLEN 52
46 #define BMBT_BLOCKCOUNT_BITLEN 21
47
48
49 #define BMBT_USE_64 1
50
51 typedef struct xfs_bmbt_rec_32
52 {
53 __uint32_t l0, l1, l2, l3;
54 } xfs_bmbt_rec_32_t;
55 typedef struct xfs_bmbt_rec_64
56 {
57 __be64 l0, l1;
58 } xfs_bmbt_rec_64_t;
59
60 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
61 typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;
62
63 typedef struct xfs_bmbt_rec_host {
64 __uint64_t l0, l1;
65 } xfs_bmbt_rec_host_t;
66
67 /*
68 * Values and macros for delayed-allocation startblock fields.
69 */
70 #define STARTBLOCKVALBITS 17
71 #define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
72 #define DSTARTBLOCKMASKBITS (15 + 20)
73 #define STARTBLOCKMASK \
74 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
75 #define DSTARTBLOCKMASK \
76 (((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
77
78 #define ISNULLSTARTBLOCK(x) isnullstartblock(x)
79 static inline int isnullstartblock(xfs_fsblock_t x)
80 {
81 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
82 }
83
84 #define ISNULLDSTARTBLOCK(x) isnulldstartblock(x)
85 static inline int isnulldstartblock(xfs_dfsbno_t x)
86 {
87 return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
88 }
89
90 #define NULLSTARTBLOCK(k) nullstartblock(k)
91 static inline xfs_fsblock_t nullstartblock(int k)
92 {
93 ASSERT(k < (1 << STARTBLOCKVALBITS));
94 return STARTBLOCKMASK | (k);
95 }
96
97 #define STARTBLOCKVAL(x) startblockval(x)
98 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
99 {
100 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
101 }
102
103 /*
104 * Possible extent formats.
105 */
106 typedef enum {
107 XFS_EXTFMT_NOSTATE = 0,
108 XFS_EXTFMT_HASSTATE
109 } xfs_exntfmt_t;
110
111 /*
112 * Possible extent states.
113 */
114 typedef enum {
115 XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
116 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
117 } xfs_exntst_t;
118
119 /*
120 * Extent state and extent format macros.
121 */
122 #define XFS_EXTFMT_INODE(x) \
123 (xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
124 XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
125 #define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
126
127 /*
128 * Incore version of above.
129 */
130 typedef struct xfs_bmbt_irec
131 {
132 xfs_fileoff_t br_startoff; /* starting file offset */
133 xfs_fsblock_t br_startblock; /* starting block number */
134 xfs_filblks_t br_blockcount; /* number of blocks */
135 xfs_exntst_t br_state; /* extent state */
136 } xfs_bmbt_irec_t;
137
138 /*
139 * Key structure for non-leaf levels of the tree.
140 */
141 typedef struct xfs_bmbt_key {
142 __be64 br_startoff; /* starting file offset */
143 } xfs_bmbt_key_t, xfs_bmdr_key_t;
144
145 /* btree pointer type */
146 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
147
148 /* btree block header type */
149 typedef struct xfs_btree_lblock xfs_bmbt_block_t;
150
151 #define XFS_BUF_TO_BMBT_BLOCK(bp) ((xfs_bmbt_block_t *)XFS_BUF_PTR(bp))
152
153 #define XFS_BMAP_RBLOCK_DSIZE(lev,cur) ((cur)->bc_private.b.forksize)
154 #define XFS_BMAP_RBLOCK_ISIZE(lev,cur) \
155 ((int)XFS_IFORK_PTR((cur)->bc_private.b.ip, \
156 (cur)->bc_private.b.whichfork)->if_broot_bytes)
157
158 #define XFS_BMAP_BLOCK_DMAXRECS(lev,cur) \
159 (((lev) == (cur)->bc_nlevels - 1 ? \
160 XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur), \
161 xfs_bmdr, (lev) == 0) : \
162 ((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
163 #define XFS_BMAP_BLOCK_IMAXRECS(lev,cur) \
164 (((lev) == (cur)->bc_nlevels - 1 ? \
165 XFS_BTREE_BLOCK_MAXRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
166 xfs_bmbt, (lev) == 0) : \
167 ((cur)->bc_mp->m_bmap_dmxr[(lev) != 0])))
168
169 #define XFS_BMAP_BLOCK_DMINRECS(lev,cur) \
170 (((lev) == (cur)->bc_nlevels - 1 ? \
171 XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_DSIZE(lev,cur),\
172 xfs_bmdr, (lev) == 0) : \
173 ((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
174 #define XFS_BMAP_BLOCK_IMINRECS(lev,cur) \
175 (((lev) == (cur)->bc_nlevels - 1 ? \
176 XFS_BTREE_BLOCK_MINRECS(XFS_BMAP_RBLOCK_ISIZE(lev,cur),\
177 xfs_bmbt, (lev) == 0) : \
178 ((cur)->bc_mp->m_bmap_dmnr[(lev) != 0])))
179
180 #define XFS_BMAP_REC_DADDR(bb,i,cur) (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))
181
182 #define XFS_BMAP_REC_IADDR(bb,i,cur) (XFS_BTREE_REC_ADDR(xfs_bmbt, bb, i))
183
184 #define XFS_BMAP_KEY_DADDR(bb,i,cur) \
185 (XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))
186
187 #define XFS_BMAP_KEY_IADDR(bb,i,cur) \
188 (XFS_BTREE_KEY_ADDR(xfs_bmbt, bb, i))
189
190 #define XFS_BMAP_PTR_DADDR(bb,i,cur) \
191 (XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_DMAXRECS( \
192 be16_to_cpu((bb)->bb_level), cur)))
193 #define XFS_BMAP_PTR_IADDR(bb,i,cur) \
194 (XFS_BTREE_PTR_ADDR(xfs_bmbt, bb, i, XFS_BMAP_BLOCK_IMAXRECS( \
195 be16_to_cpu((bb)->bb_level), cur)))
196
197 /*
198 * These are to be used when we know the size of the block and
199 * we don't have a cursor.
200 */
201 #define XFS_BMAP_BROOT_REC_ADDR(bb,i,sz) \
202 (XFS_BTREE_REC_ADDR(xfs_bmbt,bb,i))
203 #define XFS_BMAP_BROOT_KEY_ADDR(bb,i,sz) \
204 (XFS_BTREE_KEY_ADDR(xfs_bmbt,bb,i))
205 #define XFS_BMAP_BROOT_PTR_ADDR(bb,i,sz) \
206 (XFS_BTREE_PTR_ADDR(xfs_bmbt,bb,i,XFS_BMAP_BROOT_MAXRECS(sz)))
207
208 #define XFS_BMAP_BROOT_NUMRECS(bb) be16_to_cpu((bb)->bb_numrecs)
209 #define XFS_BMAP_BROOT_MAXRECS(sz) XFS_BTREE_BLOCK_MAXRECS(sz,xfs_bmbt,0)
210
211 #define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
212 (int)(sizeof(xfs_bmbt_block_t) + \
213 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
214
215 #define XFS_BMAP_BROOT_SPACE(bb) \
216 (XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
217 #define XFS_BMDR_SPACE_CALC(nrecs) \
218 (int)(sizeof(xfs_bmdr_block_t) + \
219 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
220
221 /*
222 * Maximum number of bmap btree levels.
223 */
224 #define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
225
226 #define XFS_BMAP_SANITY_CHECK(mp,bb,level) \
227 (be32_to_cpu((bb)->bb_magic) == XFS_BMAP_MAGIC && \
228 be16_to_cpu((bb)->bb_level) == level && \
229 be16_to_cpu((bb)->bb_numrecs) > 0 && \
230 be16_to_cpu((bb)->bb_numrecs) <= (mp)->m_bmap_dmxr[(level) != 0])
231
232
233 #ifdef __KERNEL__
234
235 #if defined(XFS_BMBT_TRACE)
236 /*
237 * Trace buffer entry types.
238 */
239 #define XFS_BMBT_KTRACE_ARGBI 1
240 #define XFS_BMBT_KTRACE_ARGBII 2
241 #define XFS_BMBT_KTRACE_ARGFFFI 3
242 #define XFS_BMBT_KTRACE_ARGI 4
243 #define XFS_BMBT_KTRACE_ARGIFK 5
244 #define XFS_BMBT_KTRACE_ARGIFR 6
245 #define XFS_BMBT_KTRACE_ARGIK 7
246 #define XFS_BMBT_KTRACE_CUR 8
247
248 #define XFS_BMBT_TRACE_SIZE 4096 /* size of global trace buffer */
249 #define XFS_BMBT_KTRACE_SIZE 32 /* size of per-inode trace buffer */
250 extern ktrace_t *xfs_bmbt_trace_buf;
251 #endif
252
253 /*
254 * Prototypes for xfs_bmap.c to call.
255 */
256 extern void xfs_bmdr_to_bmbt(xfs_bmdr_block_t *, int, xfs_bmbt_block_t *, int);
257 extern int xfs_bmbt_decrement(struct xfs_btree_cur *, int, int *);
258 extern int xfs_bmbt_delete(struct xfs_btree_cur *, int *);
259 extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
260 extern xfs_bmbt_block_t *xfs_bmbt_get_block(struct xfs_btree_cur *cur,
261 int, struct xfs_buf **bpp);
262 extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
263 extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
264 extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
265 extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
266
267 extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
268 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
269 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
270
271 extern int xfs_bmbt_increment(struct xfs_btree_cur *, int, int *);
272 extern int xfs_bmbt_insert(struct xfs_btree_cur *, int *);
273 extern void xfs_bmbt_log_block(struct xfs_btree_cur *, struct xfs_buf *, int);
274 extern void xfs_bmbt_log_recs(struct xfs_btree_cur *, struct xfs_buf *, int,
275 int);
276 extern int xfs_bmbt_lookup_eq(struct xfs_btree_cur *, xfs_fileoff_t,
277 xfs_fsblock_t, xfs_filblks_t, int *);
278 extern int xfs_bmbt_lookup_ge(struct xfs_btree_cur *, xfs_fileoff_t,
279 xfs_fsblock_t, xfs_filblks_t, int *);
280
281 /*
282 * Give the bmap btree a new root block. Copy the old broot contents
283 * down into a real block and make the broot point to it.
284 */
285 extern int xfs_bmbt_newroot(struct xfs_btree_cur *cur, int *lflags, int *stat);
286
287 extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
288 extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
289 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
290 extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
291 extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
292 extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
293 extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
294
295 extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
296 extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
297 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
298
299 extern void xfs_bmbt_to_bmdr(xfs_bmbt_block_t *, int, xfs_bmdr_block_t *, int);
300 extern int xfs_bmbt_update(struct xfs_btree_cur *, xfs_fileoff_t,
301 xfs_fsblock_t, xfs_filblks_t, xfs_exntst_t);
302
303 #endif /* __KERNEL__ */
304
305 #endif /* __XFS_BMAP_BTREE_H__ */
306
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