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