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_block;
25 struct xfs_mount;
26 struct xfs_inode;
27 struct xfs_trans;
28
29 /*
30 * Bmap root header, on-disk form only.
31 */
32 typedef struct xfs_bmdr_block {
33 __be16 bb_level; /* 0 is a leaf */
34 __be16 bb_numrecs; /* current # of data records */
35 } xfs_bmdr_block_t;
36
37 /*
38 * Bmap btree record and extent descriptor.
39 * l0:63 is an extent flag (value 1 indicates non-normal).
40 * l0:9-62 are startoff.
41 * l0:0-8 and l1:21-63 are startblock.
42 * l1:0-20 are blockcount.
43 */
44 #define BMBT_EXNTFLAG_BITLEN 1
45 #define BMBT_STARTOFF_BITLEN 54
46 #define BMBT_STARTBLOCK_BITLEN 52
47 #define BMBT_BLOCKCOUNT_BITLEN 21
48
49
50 #define BMBT_USE_64 1
51
52 typedef struct xfs_bmbt_rec_32
53 {
54 __uint32_t l0, l1, l2, l3;
55 } xfs_bmbt_rec_32_t;
56 typedef struct xfs_bmbt_rec_64
57 {
58 __be64 l0, l1;
59 } xfs_bmbt_rec_64_t;
60
61 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
62 typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;
63
64 typedef struct xfs_bmbt_rec_host {
65 __uint64_t l0, l1;
66 } xfs_bmbt_rec_host_t;
67
68 /*
69 * Values and macros for delayed-allocation startblock fields.
70 */
71 #define STARTBLOCKVALBITS 17
72 #define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
73 #define DSTARTBLOCKMASKBITS (15 + 20)
74 #define STARTBLOCKMASK \
75 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
76 #define DSTARTBLOCKMASK \
77 (((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
78
79 static inline int isnullstartblock(xfs_fsblock_t x)
80 {
81 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
82 }
83
84 static inline int isnulldstartblock(xfs_dfsbno_t x)
85 {
86 return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
87 }
88
89 static inline xfs_fsblock_t nullstartblock(int k)
90 {
91 ASSERT(k < (1 << STARTBLOCKVALBITS));
92 return STARTBLOCKMASK | (k);
93 }
94
95 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
96 {
97 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
98 }
99
100 /*
101 * Possible extent formats.
102 */
103 typedef enum {
104 XFS_EXTFMT_NOSTATE = 0,
105 XFS_EXTFMT_HASSTATE
106 } xfs_exntfmt_t;
107
108 /*
109 * Possible extent states.
110 */
111 typedef enum {
112 XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
113 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
114 } xfs_exntst_t;
115
116 /*
117 * Extent state and extent format macros.
118 */
119 #define XFS_EXTFMT_INODE(x) \
120 (xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
121 XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
122 #define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
123
124 /*
125 * Incore version of above.
126 */
127 typedef struct xfs_bmbt_irec
128 {
129 xfs_fileoff_t br_startoff; /* starting file offset */
130 xfs_fsblock_t br_startblock; /* starting block number */
131 xfs_filblks_t br_blockcount; /* number of blocks */
132 xfs_exntst_t br_state; /* extent state */
133 } xfs_bmbt_irec_t;
134
135 /*
136 * Key structure for non-leaf levels of the tree.
137 */
138 typedef struct xfs_bmbt_key {
139 __be64 br_startoff; /* starting file offset */
140 } xfs_bmbt_key_t, xfs_bmdr_key_t;
141
142 /* btree pointer type */
143 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
144
145 /*
146 * Btree block header size depends on a superblock flag.
147 *
148 * (not quite yet, but soon)
149 */
150 #define XFS_BMBT_BLOCK_LEN(mp) XFS_BTREE_LBLOCK_LEN
151
152 #define XFS_BMBT_REC_ADDR(mp, block, index) \
153 ((xfs_bmbt_rec_t *) \
154 ((char *)(block) + \
155 XFS_BMBT_BLOCK_LEN(mp) + \
156 ((index) - 1) * sizeof(xfs_bmbt_rec_t)))
157
158 #define XFS_BMBT_KEY_ADDR(mp, block, index) \
159 ((xfs_bmbt_key_t *) \
160 ((char *)(block) + \
161 XFS_BMBT_BLOCK_LEN(mp) + \
162 ((index) - 1) * sizeof(xfs_bmbt_key_t)))
163
164 #define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
165 ((xfs_bmbt_ptr_t *) \
166 ((char *)(block) + \
167 XFS_BMBT_BLOCK_LEN(mp) + \
168 (maxrecs) * sizeof(xfs_bmbt_key_t) + \
169 ((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
170
171 #define XFS_BMDR_REC_ADDR(block, index) \
172 ((xfs_bmdr_rec_t *) \
173 ((char *)(block) + \
174 sizeof(struct xfs_bmdr_block) + \
175 ((index) - 1) * sizeof(xfs_bmdr_rec_t)))
176
177 #define XFS_BMDR_KEY_ADDR(block, index) \
178 ((xfs_bmdr_key_t *) \
179 ((char *)(block) + \
180 sizeof(struct xfs_bmdr_block) + \
181 ((index) - 1) * sizeof(xfs_bmdr_key_t)))
182
183 #define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
184 ((xfs_bmdr_ptr_t *) \
185 ((char *)(block) + \
186 sizeof(struct xfs_bmdr_block) + \
187 (maxrecs) * sizeof(xfs_bmdr_key_t) + \
188 ((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
189
190 /*
191 * These are to be used when we know the size of the block and
192 * we don't have a cursor.
193 */
194 #define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
195 XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
196
197 #define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
198 (int)(XFS_BTREE_LBLOCK_LEN + \
199 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
200
201 #define XFS_BMAP_BROOT_SPACE(bb) \
202 (XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
203 #define XFS_BMDR_SPACE_CALC(nrecs) \
204 (int)(sizeof(xfs_bmdr_block_t) + \
205 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
206
207 /*
208 * Maximum number of bmap btree levels.
209 */
210 #define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
211
212 /*
213 * Prototypes for xfs_bmap.c to call.
214 */
215 extern void xfs_bmdr_to_bmbt(struct xfs_mount *, xfs_bmdr_block_t *, int,
216 struct xfs_btree_block *, int);
217 extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
218 extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
219 extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
220 extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
221 extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
222
223 extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
224 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
225 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
226
227 extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
228 extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
229 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
230 extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
231 extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
232 extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
233 extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
234
235 extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
236 extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
237 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
238
239 extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
240 xfs_bmdr_block_t *, int);
241
242 extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
243 extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
244 extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
245
246 extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
247 struct xfs_trans *, struct xfs_inode *, int);
248
249
250 #endif /* __XFS_BMAP_BTREE_H__ */
251
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