tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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#define XFS_BMAP_CRC_MAGIC 0x424d4133 /* 'BMA3' */
23
24struct xfs_btree_cur;
25struct xfs_btree_block;
26struct xfs_mount;
27struct xfs_inode;
28struct xfs_trans;
29
30/*
31 * Bmap root header, on-disk form only.
32 */
33typedef struct xfs_bmdr_block {
34 __be16 bb_level; /* 0 is a leaf */
35 __be16 bb_numrecs; /* current # of data records */
36} xfs_bmdr_block_t;
37
38/*
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.
44 */
45#define BMBT_EXNTFLAG_BITLEN 1
46#define BMBT_STARTOFF_BITLEN 54
47#define BMBT_STARTBLOCK_BITLEN 52
48#define BMBT_BLOCKCOUNT_BITLEN 21
49
50typedef struct xfs_bmbt_rec {
51 __be64 l0, l1;
52} xfs_bmbt_rec_t;
53
54typedef __uint64_t xfs_bmbt_rec_base_t; /* use this for casts */
55typedef xfs_bmbt_rec_t xfs_bmdr_rec_t;
56
57typedef struct xfs_bmbt_rec_host {
58 __uint64_t l0, l1;
59} xfs_bmbt_rec_host_t;
60
61/*
62 * Values and macros for delayed-allocation startblock fields.
63 */
64#define STARTBLOCKVALBITS 17
65#define STARTBLOCKMASKBITS (15 + XFS_BIG_BLKNOS * 20)
66#define DSTARTBLOCKMASKBITS (15 + 20)
67#define STARTBLOCKMASK \
68 (((((xfs_fsblock_t)1) << STARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
69#define DSTARTBLOCKMASK \
70 (((((xfs_dfsbno_t)1) << DSTARTBLOCKMASKBITS) - 1) << STARTBLOCKVALBITS)
71
72static inline int isnullstartblock(xfs_fsblock_t x)
73{
74 return ((x) & STARTBLOCKMASK) == STARTBLOCKMASK;
75}
76
77static inline int isnulldstartblock(xfs_dfsbno_t x)
78{
79 return ((x) & DSTARTBLOCKMASK) == DSTARTBLOCKMASK;
80}
81
82static inline xfs_fsblock_t nullstartblock(int k)
83{
84 ASSERT(k < (1 << STARTBLOCKVALBITS));
85 return STARTBLOCKMASK | (k);
86}
87
88static inline xfs_filblks_t startblockval(xfs_fsblock_t x)
89{
90 return (xfs_filblks_t)((x) & ~STARTBLOCKMASK);
91}
92
93/*
94 * Possible extent formats.
95 */
96typedef enum {
97 XFS_EXTFMT_NOSTATE = 0,
98 XFS_EXTFMT_HASSTATE
99} xfs_exntfmt_t;
100
101/*
102 * Possible extent states.
103 */
104typedef enum {
105 XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
106 XFS_EXT_DMAPI_OFFLINE, XFS_EXT_INVALID
107} xfs_exntst_t;
108
109/*
110 * Extent state and extent format macros.
111 */
112#define XFS_EXTFMT_INODE(x) \
113 (xfs_sb_version_hasextflgbit(&((x)->i_mount->m_sb)) ? \
114 XFS_EXTFMT_HASSTATE : XFS_EXTFMT_NOSTATE)
115#define ISUNWRITTEN(x) ((x)->br_state == XFS_EXT_UNWRITTEN)
116
117/*
118 * Incore version of above.
119 */
120typedef struct xfs_bmbt_irec
121{
122 xfs_fileoff_t br_startoff; /* starting file offset */
123 xfs_fsblock_t br_startblock; /* starting block number */
124 xfs_filblks_t br_blockcount; /* number of blocks */
125 xfs_exntst_t br_state; /* extent state */
126} xfs_bmbt_irec_t;
127
128/*
129 * Key structure for non-leaf levels of the tree.
130 */
131typedef struct xfs_bmbt_key {
132 __be64 br_startoff; /* starting file offset */
133} xfs_bmbt_key_t, xfs_bmdr_key_t;
134
135/* btree pointer type */
136typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
137
138/*
139 * Btree block header size depends on a superblock flag.
140 */
141#define XFS_BMBT_BLOCK_LEN(mp) \
142 (xfs_sb_version_hascrc(&((mp)->m_sb)) ? \
143 XFS_BTREE_LBLOCK_CRC_LEN : XFS_BTREE_LBLOCK_LEN)
144
145#define XFS_BMBT_REC_ADDR(mp, block, index) \
146 ((xfs_bmbt_rec_t *) \
147 ((char *)(block) + \
148 XFS_BMBT_BLOCK_LEN(mp) + \
149 ((index) - 1) * sizeof(xfs_bmbt_rec_t)))
150
151#define XFS_BMBT_KEY_ADDR(mp, block, index) \
152 ((xfs_bmbt_key_t *) \
153 ((char *)(block) + \
154 XFS_BMBT_BLOCK_LEN(mp) + \
155 ((index) - 1) * sizeof(xfs_bmbt_key_t)))
156
157#define XFS_BMBT_PTR_ADDR(mp, block, index, maxrecs) \
158 ((xfs_bmbt_ptr_t *) \
159 ((char *)(block) + \
160 XFS_BMBT_BLOCK_LEN(mp) + \
161 (maxrecs) * sizeof(xfs_bmbt_key_t) + \
162 ((index) - 1) * sizeof(xfs_bmbt_ptr_t)))
163
164#define XFS_BMDR_REC_ADDR(block, index) \
165 ((xfs_bmdr_rec_t *) \
166 ((char *)(block) + \
167 sizeof(struct xfs_bmdr_block) + \
168 ((index) - 1) * sizeof(xfs_bmdr_rec_t)))
169
170#define XFS_BMDR_KEY_ADDR(block, index) \
171 ((xfs_bmdr_key_t *) \
172 ((char *)(block) + \
173 sizeof(struct xfs_bmdr_block) + \
174 ((index) - 1) * sizeof(xfs_bmdr_key_t)))
175
176#define XFS_BMDR_PTR_ADDR(block, index, maxrecs) \
177 ((xfs_bmdr_ptr_t *) \
178 ((char *)(block) + \
179 sizeof(struct xfs_bmdr_block) + \
180 (maxrecs) * sizeof(xfs_bmdr_key_t) + \
181 ((index) - 1) * sizeof(xfs_bmdr_ptr_t)))
182
183/*
184 * These are to be used when we know the size of the block and
185 * we don't have a cursor.
186 */
187#define XFS_BMAP_BROOT_PTR_ADDR(mp, bb, i, sz) \
188 XFS_BMBT_PTR_ADDR(mp, bb, i, xfs_bmbt_maxrecs(mp, sz, 0))
189
190#define XFS_BMAP_BROOT_SPACE_CALC(mp, nrecs) \
191 (int)(XFS_BMBT_BLOCK_LEN(mp) + \
192 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
193
194#define XFS_BMAP_BROOT_SPACE(mp, bb) \
195 (XFS_BMAP_BROOT_SPACE_CALC(mp, be16_to_cpu((bb)->bb_numrecs)))
196#define XFS_BMDR_SPACE_CALC(nrecs) \
197 (int)(sizeof(xfs_bmdr_block_t) + \
198 ((nrecs) * (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t))))
199#define XFS_BMAP_BMDR_SPACE(bb) \
200 (XFS_BMDR_SPACE_CALC(be16_to_cpu((bb)->bb_numrecs)))
201
202/*
203 * Maximum number of bmap btree levels.
204 */
205#define XFS_BM_MAXLEVELS(mp,w) ((mp)->m_bm_maxlevels[(w)])
206
207/*
208 * Prototypes for xfs_bmap.c to call.
209 */
210extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int,
211 struct xfs_btree_block *, int);
212extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
213extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r);
214extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r);
215extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r);
216extern xfs_exntst_t xfs_bmbt_get_state(xfs_bmbt_rec_host_t *r);
217
218extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r);
219extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r);
220
221extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s);
222extern void xfs_bmbt_set_allf(xfs_bmbt_rec_host_t *r, xfs_fileoff_t o,
223 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
224extern void xfs_bmbt_set_blockcount(xfs_bmbt_rec_host_t *r, xfs_filblks_t v);
225extern void xfs_bmbt_set_startblock(xfs_bmbt_rec_host_t *r, xfs_fsblock_t v);
226extern void xfs_bmbt_set_startoff(xfs_bmbt_rec_host_t *r, xfs_fileoff_t v);
227extern void xfs_bmbt_set_state(xfs_bmbt_rec_host_t *r, xfs_exntst_t v);
228
229extern void xfs_bmbt_disk_set_allf(xfs_bmbt_rec_t *r, xfs_fileoff_t o,
230 xfs_fsblock_t b, xfs_filblks_t c, xfs_exntst_t v);
231
232extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int,
233 xfs_bmdr_block_t *, int);
234
235extern int xfs_bmbt_get_maxrecs(struct xfs_btree_cur *, int level);
236extern int xfs_bmdr_maxrecs(struct xfs_mount *, int blocklen, int leaf);
237extern int xfs_bmbt_maxrecs(struct xfs_mount *, int blocklen, int leaf);
238
239extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
240 struct xfs_trans *, struct xfs_inode *, int);
241
242extern const struct xfs_buf_ops xfs_bmbt_buf_ops;
243
244#endif /* __XFS_BMAP_BTREE_H__ */