2 * Copyright (c) 2000-2001,2005 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_DIR2_LEAF_H__
19 #define __XFS_DIR2_LEAF_H__
29 * Offset of the leaf/node space. First block in this space
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)
38 * Offset in data space of a data entry.
40 typedef __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)
47 typedef struct xfs_dir2_leaf_hdr {
48 xfs_da_blkinfo_t info; /* header for da routines */
49 __be16 count; /* count of entries */
50 __be16 stale; /* count of stale entries */
51 } xfs_dir2_leaf_hdr_t;
56 typedef struct xfs_dir2_leaf_entry {
57 __be32 hashval; /* hash value of name */
58 __be32 address; /* address of data entry */
59 } xfs_dir2_leaf_entry_t;
64 typedef struct xfs_dir2_leaf_tail {
66 } xfs_dir2_leaf_tail_t;
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).
73 typedef struct xfs_dir2_leaf {
74 xfs_dir2_leaf_hdr_t hdr; /* leaf header */
75 xfs_dir2_leaf_entry_t ents[1]; /* entries */
77 xfs_dir2_data_off_t bests[1]; /* best free counts */
78 xfs_dir2_leaf_tail_t tail; /* leaf tail */
82 * DB blocks here are logical directory block numbers, not filesystem blocks.
85 static inline int xfs_dir2_max_leaf_ents(struct xfs_mount *mp)
87 return (int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) /
88 (uint)sizeof(xfs_dir2_leaf_entry_t));
92 * Get address of the bestcount field in the single-leaf block.
94 static inline xfs_dir2_leaf_tail_t *
95 xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp)
97 return (xfs_dir2_leaf_tail_t *)
98 ((char *)(lp) + (mp)->m_dirblksize -
99 (uint)sizeof(xfs_dir2_leaf_tail_t));
103 * Get address of the bests array in the single-leaf block.
105 static inline __be16 *
106 xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp)
108 return (__be16 *)ltp - be32_to_cpu(ltp->bestcount);
112 * Convert dataptr to byte in file space
114 static inline xfs_dir2_off_t
115 xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
117 return (xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG;
121 * Convert byte in file space to dataptr. It had better be aligned.
123 static inline xfs_dir2_dataptr_t
124 xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by)
126 return (xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG);
130 * Convert byte in space to (DB) block
132 static inline xfs_dir2_db_t
133 xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by)
135 return (xfs_dir2_db_t)((by) >> \
136 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog));
140 * Convert dataptr to a block number
142 static inline xfs_dir2_db_t
143 xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
145 return xfs_dir2_byte_to_db(mp, xfs_dir2_dataptr_to_byte(mp, dp));
149 * Convert byte in space to offset in a block
151 static inline xfs_dir2_data_aoff_t
152 xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by)
154 return (xfs_dir2_data_aoff_t)((by) & \
155 ((1 << ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) - 1));
159 * Convert dataptr to a byte offset in a block
161 static inline xfs_dir2_data_aoff_t
162 xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
164 return xfs_dir2_byte_to_off(mp, xfs_dir2_dataptr_to_byte(mp, dp));
168 * Convert block and offset to byte in space
170 static inline xfs_dir2_off_t
171 xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db,
172 xfs_dir2_data_aoff_t o)
174 return ((xfs_dir2_off_t)(db) << \
175 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o);
179 * Convert block (DB) to block (dablk)
181 static inline xfs_dablk_t
182 xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db)
184 return (xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog);
188 * Convert byte in space to (DA) block
190 static inline xfs_dablk_t
191 xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by)
193 return xfs_dir2_db_to_da(mp, xfs_dir2_byte_to_db(mp, by));
197 * Convert block and offset to dataptr
199 static inline xfs_dir2_dataptr_t
200 xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db,
201 xfs_dir2_data_aoff_t o)
203 return xfs_dir2_byte_to_dataptr(mp, xfs_dir2_db_off_to_byte(mp, db, o));
207 * Convert block (dablk) to block (DB)
209 static inline xfs_dir2_db_t
210 xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da)
212 return (xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog);
216 * Convert block (dablk) to byte offset in space
218 static inline xfs_dir2_off_t
219 xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da)
221 return xfs_dir2_db_off_to_byte(mp, xfs_dir2_da_to_db(mp, da), 0);
225 * Function declarations.
227 extern int xfs_dir2_block_to_leaf(struct xfs_da_args *args,
228 struct xfs_dabuf *dbp);
229 extern int xfs_dir2_leaf_addname(struct xfs_da_args *args);
230 extern void xfs_dir2_leaf_compact(struct xfs_da_args *args,
231 struct xfs_dabuf *bp);
232 extern void xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp,
233 int *lowstalep, int *highstalep,
234 int *lowlogp, int *highlogp);
235 extern int xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
236 struct uio *uio, int *eofp,
237 struct xfs_dirent *dbp, xfs_dir2_put_t put);
238 extern int xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno,
239 struct xfs_dabuf **bpp, int magic);
240 extern void xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp,
241 int first, int last);
242 extern void xfs_dir2_leaf_log_header(struct xfs_trans *tp,
243 struct xfs_dabuf *bp);
244 extern int xfs_dir2_leaf_lookup(struct xfs_da_args *args);
245 extern int xfs_dir2_leaf_removename(struct xfs_da_args *args);
246 extern int xfs_dir2_leaf_replace(struct xfs_da_args *args);
247 extern int xfs_dir2_leaf_search_hash(struct xfs_da_args *args,
248 struct xfs_dabuf *lbp);
249 extern int xfs_dir2_leaf_trim_data(struct xfs_da_args *args,
250 struct xfs_dabuf *lbp, xfs_dir2_db_t db);
251 extern int xfs_dir2_node_to_leaf(struct xfs_da_state *state);
253 #endif /* __XFS_DIR2_LEAF_H__ */