2 * Copyright (c) 2000,2002-2005 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_BTREE_H__
19 #define __XFS_BMAP_BTREE_H__
21 #define XFS_BMAP_MAGIC 0x424d4150 /* 'BMAP' */
24 struct xfs_btree_block;
25 struct xfs_btree_lblock;
31 * Bmap root header, on-disk form only.
33 typedef struct xfs_bmdr_block {
34 __be16 bb_level; /* 0 is a leaf */
35 __be16 bb_numrecs; /* current # of data records */
39 * Bmap btree record and extent descriptor.
40 * l0:63 is an extent flag (value 1 indicates non-normal).
41 * l0:9-62 are startoff.
42 * l0:0-8 and l1:21-63 are startblock.
43 * l1:0-20 are blockcount.
45 #define BMBT_EXNTFLAG_BITLEN 1
46 #define BMBT_STARTOFF_BITLEN 54
47 #define BMBT_STARTBLOCK_BITLEN 52
48 #define BMBT_BLOCKCOUNT_BITLEN 21
53 typedef struct xfs_bmbt_rec_32
55 __uint32_t l0, l1, l2, l3;
57 typedef struct xfs_bmbt_rec_64
62 typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
63 typedef xfs_bmbt_rec_64_t xfs_bmbt_rec_t, xfs_bmdr_rec_t;
65 typedef struct xfs_bmbt_rec_host {
67 } xfs_bmbt_rec_host_t;
70 * Values and macros for delayed-allocation startblock fields.
72 #define STARTBLOCKVALBITS 17
73 #define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
74 #define DSTARTBLOCKMASKBITS (15 + 20)
75 #define STARTBLOCKMASK \
76 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
77 #define DSTARTBLOCKMASK \
78 (((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
80 #define ISNULLSTARTBLOCK(x) isnullstartblock(x)
81 static inline int isnullstartblock(xfs_fsblock_t x)
83 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
86 #define ISNULLDSTARTBLOCK(x) isnulldstartblock(x)
87 static inline int isnulldstartblock(xfs_dfsbno_t x)
89 return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
92 #define NULLSTARTBLOCK(k) nullstartblock(k)
93 static inline xfs_fsblock_t nullstartblock(int k)
95 ASSERT(k < (1 << STARTBLOCKVALBITS));
96 return STARTBLOCKMASK | (k);
99 #define STARTBLOCKVAL(x) startblockval(x)
100 static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
102 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
106 * Possible extent formats.
109 XFS_EXTFMT_NOSTATE = 0,
114 * Possible extent states.
117 XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
118 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
122 * Extent state and extent format macros.
124 #define XFS_EXTFMT_INODE(x) \
125 (xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
126 XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
127 #define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
130 * Incore version of above.
132 typedef struct xfs_bmbt_irec
134 xfs_fileoff_t br_startoff; /* starting file offset */
135 xfs_fsblock_t br_startblock; /* starting block number */
136 xfs_filblks_t br_blockcount; /* number of blocks */
137 xfs_exntst_t br_state; /* extent state */
141 * Key structure for non-leaf levels of the tree.
143 typedef struct xfs_bmbt_key {
144 __be64 br_startoff; /* starting file offset */
145 } xfs_bmbt_key_t, xfs_bmdr_key_t;
147 /* btree pointer type */
148 typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
150 /* btree block header type */
151 typedef struct xfs_btree_lblock xfs_bmbt_block_t;
153 #define XFS_BUF_TO_BMBT_BLOCK(bp) ((xfs_bmbt_block_t *)XFS_BUF_PTR(bp))
155 #define XFS_BMBT_REC_ADDR(mp, block, index) \
156 ((xfs_bmbt_rec_t *) \
158 sizeof(struct xfs_btree_lblock) + \
159 ((index) - 1) * sizeof(xfs_bmbt_rec_t)))
161 #define XFS_BMBT_KEY_ADDR(mp, block, index) \
162 ((xfs_bmbt_key_t *) \
164 sizeof(struct xfs_btree_lblock) + \
165 ((index) - 1) * sizeof(xfs_bmbt_key_t)))
167 #define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
168 ((xfs_bmbt_ptr_t *) \
170 sizeof(struct xfs_btree_lblock) + \
171 (maxrecs) * sizeof(xfs_bmbt_key_t) + \
172 ((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
174 #define XFS_BMDR_REC_ADDR(block, index) \
175 ((xfs_bmdr_rec_t *) \
177 sizeof(struct xfs_bmdr_block) + \
178 ((index) - 1) * sizeof(xfs_bmdr_rec_t)))
180 #define XFS_BMDR_KEY_ADDR(block, index) \
181 ((xfs_bmdr_key_t *) \
183 sizeof(struct xfs_bmdr_block) + \
184 ((index) - 1) * sizeof(xfs_bmdr_key_t)))
186 #define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
187 ((xfs_bmdr_ptr_t *) \
189 sizeof(struct xfs_bmdr_block) + \
190 (maxrecs) * sizeof(xfs_bmdr_key_t) + \
191 ((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
194 * These are to be used when we know the size of the block and
195 * we don't have a cursor.
197 #define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
198 XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
200 #define XFS_BMAP_BROOT_SPACE_CALC(nrecs) \
201 (int)(sizeof(xfs_bmbt_block_t) + \
202 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
204 #define XFS_BMAP_BROOT_SPACE(bb) \
205 (XFS_BMAP_BROOT_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
206 #define XFS_BMDR_SPACE_CALC(nrecs) \
207 (int)(sizeof(xfs_bmdr_block_t) + \
208 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
211 * Maximum number of bmap btree levels.
213 #define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
215 #define XFS_BMAP_SANITY_CHECK(mp,bb,level) \
216 (be32_to_cpu((bb)->bb_magic) == XFS_BMAP_MAGIC && \
217 be16_to_cpu((bb)->bb_level) == level && \
218 be16_to_cpu((bb)->bb_numrecs) > 0 && \
219 be16_to_cpu((bb)->bb_numrecs) <= (mp)->m_bmap_dmxr[(level) != 0])
223 * Prototypes for xfs_bmap.c to call.
225 extern void xfs_bmdr_to_bmbt(struct xfs_mount *, xfs_bmdr_block_t *, int,
226 xfs_bmbt_block_t *, int);
227 extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
228 extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
229 extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
230 extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
231 extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
233 extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
234 extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
235 extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
237 extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
238 extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
239 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
240 extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
241 extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
242 extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
243 extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
245 extern void xfs_bmbt_disk_set_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s);
246 extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
247 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
249 extern void xfs_bmbt_to_bmdr(struct xfs_mount *, xfs_bmbt_block_t *, int,
250 xfs_bmdr_block_t *, int);
252 extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
253 extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
254 extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
256 extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
257 struct xfs_trans *, struct xfs_inode *, int);
260 #endif /* __XFS_BMAP_BTREE_H__ */