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[mirror_ubuntu-zesty-kernel.git] / fs / xfs / xfs_dir2_leaf.h
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1da177e4 1/*
7b718769
NS		 2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
1da177e4 4 *
7b718769
NS		 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
1da177e4
LT		 7 * published by the Free Software Foundation.
8 *
7b718769
NS		 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.
1da177e4 13 *
7b718769
NS		 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
1da177e4
LT		 17 */
18#ifndef __XFS_DIR2_LEAF_H__
19#define __XFS_DIR2_LEAF_H__
20
1da177e4
LT		 21struct uio;
22struct xfs_dabuf;
23struct xfs_da_args;
24struct xfs_inode;
25struct xfs_mount;
26struct xfs_trans;
27
1da177e4
LT		 28/*
29 * Offset of the leaf/node space. First block in this space
30 * is the btree root.
31 */
32#define XFS_DIR2_LEAF_SPACE 1
33#define XFS_DIR2_LEAF_OFFSET (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE)
34#define XFS_DIR2_LEAF_FIRSTDB(mp) \
35 XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_LEAF_OFFSET)
36
1da177e4
LT		 37/*
38 * Offset in data space of a data entry.
39 */
40typedef __uint32_t xfs_dir2_dataptr_t;
41#define XFS_DIR2_MAX_DATAPTR ((xfs_dir2_dataptr_t)0xffffffff)
42#define XFS_DIR2_NULL_DATAPTR ((xfs_dir2_dataptr_t)0)
43
1da177e4
LT		 44/*
45 * Leaf block header.
46 */
47typedef struct xfs_dir2_leaf_hdr {
48 xfs_da_blkinfo_t info; /* header for da routines */
49 __uint16_t count; /* count of entries */
50 __uint16_t stale; /* count of stale entries */
51} xfs_dir2_leaf_hdr_t;
52
53/*
54 * Leaf block entry.
55 */
56typedef struct xfs_dir2_leaf_entry {
57 xfs_dahash_t hashval; /* hash value of name */
58 xfs_dir2_dataptr_t address; /* address of data entry */
59} xfs_dir2_leaf_entry_t;
60
61/*
62 * Leaf block tail.
63 */
64typedef struct xfs_dir2_leaf_tail {
65 __uint32_t bestcount;
66} xfs_dir2_leaf_tail_t;
67
68/*
69 * Leaf block.
70 * bests and tail are at the end of the block for single-leaf only
71 * (magic = XFS_DIR2_LEAF1_MAGIC not XFS_DIR2_LEAFN_MAGIC).
72 */
73typedef struct xfs_dir2_leaf {
74 xfs_dir2_leaf_hdr_t hdr; /* leaf header */
75 xfs_dir2_leaf_entry_t ents[1]; /* entries */
76 /* ... */
77 xfs_dir2_data_off_t bests[1]; /* best free counts */
78 xfs_dir2_leaf_tail_t tail; /* leaf tail */
79} xfs_dir2_leaf_t;
80
81/*
a844f451 82 * DB blocks here are logical directory block numbers, not filesystem blocks.
1da177e4
LT		 83 */
84
a844f451
NS		 85#define XFS_DIR2_MAX_LEAF_ENTS(mp) xfs_dir2_max_leaf_ents(mp)
86static inline int xfs_dir2_max_leaf_ents(struct xfs_mount *mp)
87{
88 return (int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) /
89 (uint)sizeof(xfs_dir2_leaf_entry_t));
90}
1da177e4
LT		 91
92/*
93 * Get address of the bestcount field in the single-leaf block.
94 */
a844f451
NS		 95#define XFS_DIR2_LEAF_TAIL_P(mp,lp) xfs_dir2_leaf_tail_p(mp, lp)
96static inline xfs_dir2_leaf_tail_t *
97xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp)
98{
99 return (xfs_dir2_leaf_tail_t *)
100 ((char *)(lp) + (mp)->m_dirblksize -
101 (uint)sizeof(xfs_dir2_leaf_tail_t));
102}
1da177e4
LT		 103
104/*
105 * Get address of the bests array in the single-leaf block.
106 */
1da177e4 107#define XFS_DIR2_LEAF_BESTS_P(ltp) xfs_dir2_leaf_bests_p(ltp)
a844f451
NS		 108static inline xfs_dir2_data_off_t *
109xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp)
110{
111 return (xfs_dir2_data_off_t *)
112 (ltp) - INT_GET((ltp)->bestcount, ARCH_CONVERT);
113}
1da177e4
LT		 114
115/*
116 * Convert dataptr to byte in file space
117 */
1da177e4 118#define XFS_DIR2_DATAPTR_TO_BYTE(mp,dp) xfs_dir2_dataptr_to_byte(mp, dp)
a844f451
NS		 119static inline xfs_dir2_off_t
120xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
121{
122 return (xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG;
123}
1da177e4
LT		 124
125/*
126 * Convert byte in file space to dataptr. It had better be aligned.
127 */
1da177e4 128#define XFS_DIR2_BYTE_TO_DATAPTR(mp,by) xfs_dir2_byte_to_dataptr(mp,by)
a844f451
NS		 129static inline xfs_dir2_dataptr_t
130xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by)
131{
132 return (xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG);
133}
134
135/*
136 * Convert byte in space to (DB) block
137 */
138#define XFS_DIR2_BYTE_TO_DB(mp,by) xfs_dir2_byte_to_db(mp, by)
139static inline xfs_dir2_db_t
140xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by)
141{
142 return (xfs_dir2_db_t)((by) >> \
143 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog));
144}
1da177e4
LT		 145
146/*
147 * Convert dataptr to a block number
148 */
1da177e4 149#define XFS_DIR2_DATAPTR_TO_DB(mp,dp) xfs_dir2_dataptr_to_db(mp, dp)
a844f451
NS		 150static inline xfs_dir2_db_t
151xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
152{
153 return XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp));
154}
155
156/*
157 * Convert byte in space to offset in a block
158 */
159#define XFS_DIR2_BYTE_TO_OFF(mp,by) xfs_dir2_byte_to_off(mp, by)
160static inline xfs_dir2_data_aoff_t
161xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by)
162{
163 return (xfs_dir2_data_aoff_t)((by) & \
164 ((1 << ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) - 1));
165}
1da177e4
LT		 166
167/*
168 * Convert dataptr to a byte offset in a block
169 */
1da177e4 170#define XFS_DIR2_DATAPTR_TO_OFF(mp,dp) xfs_dir2_dataptr_to_off(mp, dp)
a844f451
NS		 171static inline xfs_dir2_data_aoff_t
172xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
173{
174 return XFS_DIR2_BYTE_TO_OFF(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp));
175}
1da177e4
LT		 176
177/*
178 * Convert block and offset to byte in space
179 */
1da177e4
LT		 180#define XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o) \
181 xfs_dir2_db_off_to_byte(mp, db, o)
a844f451
NS		 182static inline xfs_dir2_off_t
183xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db,
184 xfs_dir2_data_aoff_t o)
185{
186 return ((xfs_dir2_off_t)(db) << \
187 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o);
188}
1da177e4
LT		 189
190/*
a844f451 191 * Convert block (DB) to block (dablk)
1da177e4 192 */
a844f451
NS		 193#define XFS_DIR2_DB_TO_DA(mp,db) xfs_dir2_db_to_da(mp, db)
194static inline xfs_dablk_t
195xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db)
196{
197 return (xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog);
198}
1da177e4
LT		 199
200/*
201 * Convert byte in space to (DA) block
202 */
1da177e4 203#define XFS_DIR2_BYTE_TO_DA(mp,by) xfs_dir2_byte_to_da(mp, by)
a844f451
NS		 204static inline xfs_dablk_t
205xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by)
206{
207 return XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, by));
208}
1da177e4
LT		 209
210/*
211 * Convert block and offset to dataptr
212 */
1da177e4
LT		 213#define XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o) \
214 xfs_dir2_db_off_to_dataptr(mp, db, o)
a844f451
NS		 215static inline xfs_dir2_dataptr_t
216xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db,
217 xfs_dir2_data_aoff_t o)
218{
219 return XFS_DIR2_BYTE_TO_DATAPTR(mp, XFS_DIR2_DB_OFF_TO_BYTE(mp, db, o));
220}
1da177e4
LT		 221
222/*
223 * Convert block (dablk) to block (DB)
224 */
1da177e4 225#define XFS_DIR2_DA_TO_DB(mp,da) xfs_dir2_da_to_db(mp, da)
a844f451
NS		 226static inline xfs_dir2_db_t
227xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da)
228{
229 return (xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog);
230}
1da177e4
LT		 231
232/*
233 * Convert block (dablk) to byte offset in space
234 */
1da177e4 235#define XFS_DIR2_DA_TO_BYTE(mp,da) xfs_dir2_da_to_byte(mp, da)
a844f451
NS		 236static inline xfs_dir2_off_t
237xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da)
238{
239 return XFS_DIR2_DB_OFF_TO_BYTE(mp, XFS_DIR2_DA_TO_DB(mp, da), 0);
240}
1da177e4
LT		 241
242/*
243 * Function declarations.
244 */
a844f451
NS		 245extern int xfs_dir2_block_to_leaf(struct xfs_da_args *args,
246 struct xfs_dabuf *dbp);
247extern int xfs_dir2_leaf_addname(struct xfs_da_args *args);
248extern void xfs_dir2_leaf_compact(struct xfs_da_args *args,
249 struct xfs_dabuf *bp);
250extern void xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp,
251 int *lowstalep, int *highstalep,
252 int *lowlogp, int *highlogp);
253extern int xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
254 struct uio *uio, int *eofp,
255 struct xfs_dirent *dbp, xfs_dir2_put_t put);
256extern int xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno,
257 struct xfs_dabuf **bpp, int magic);
258extern void xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp,
259 int first, int last);
260extern void xfs_dir2_leaf_log_header(struct xfs_trans *tp,
261 struct xfs_dabuf *bp);
262extern int xfs_dir2_leaf_lookup(struct xfs_da_args *args);
263extern int xfs_dir2_leaf_removename(struct xfs_da_args *args);
264extern int xfs_dir2_leaf_replace(struct xfs_da_args *args);
265extern int xfs_dir2_leaf_search_hash(struct xfs_da_args *args,
266 struct xfs_dabuf *lbp);
267extern int xfs_dir2_leaf_trim_data(struct xfs_da_args *args,
268 struct xfs_dabuf *lbp, xfs_dir2_db_t db);
269extern int xfs_dir2_node_to_leaf(struct xfs_da_state *state);
1da177e4
LT		 270
271#endif /* __XFS_DIR2_LEAF_H__ */
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