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 #define XFS_DIR2_MAX_LEAF_ENTS(mp) xfs_dir2_max_leaf_ents(mp)
86 static inline int xfs_dir2_max_leaf_ents(struct xfs_mount *mp)
88 return (int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) /
89 (uint)sizeof(xfs_dir2_leaf_entry_t));
93 * Get address of the bestcount field in the single-leaf block.
95 #define XFS_DIR2_LEAF_TAIL_P(mp,lp) xfs_dir2_leaf_tail_p(mp, lp)
96 static inline xfs_dir2_leaf_tail_t *
97 xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp)
99 return (xfs_dir2_leaf_tail_t *)
100 ((char *)(lp) + (mp)->m_dirblksize -
101 (uint)sizeof(xfs_dir2_leaf_tail_t));
105 * Get address of the bests array in the single-leaf block.
107 #define XFS_DIR2_LEAF_BESTS_P(ltp) xfs_dir2_leaf_bests_p(ltp)
108 static inline __be16 *
109 xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp)
111 return (__be16 *)ltp - be32_to_cpu(ltp->bestcount);
115 * Convert dataptr to byte in file space
117 #define XFS_DIR2_DATAPTR_TO_BYTE(mp,dp) xfs_dir2_dataptr_to_byte(mp, dp)
118 static inline xfs_dir2_off_t
119 xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
121 return (xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG;
125 * Convert byte in file space to dataptr. It had better be aligned.
127 #define XFS_DIR2_BYTE_TO_DATAPTR(mp,by) xfs_dir2_byte_to_dataptr(mp,by)
128 static inline xfs_dir2_dataptr_t
129 xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by)
131 return (xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG);
135 * Convert byte in space to (DB) block
137 #define XFS_DIR2_BYTE_TO_DB(mp,by) xfs_dir2_byte_to_db(mp, by)
138 static inline xfs_dir2_db_t
139 xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by)
141 return (xfs_dir2_db_t)((by) >> \
142 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog));
146 * Convert dataptr to a block number
148 #define XFS_DIR2_DATAPTR_TO_DB(mp,dp) xfs_dir2_dataptr_to_db(mp, dp)
149 static inline xfs_dir2_db_t
150 xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
152 return XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp));
156 * Convert byte in space to offset in a block
158 #define XFS_DIR2_BYTE_TO_OFF(mp,by) xfs_dir2_byte_to_off(mp, by)
159 static inline xfs_dir2_data_aoff_t
160 xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by)
162 return (xfs_dir2_data_aoff_t)((by) & \
163 ((1 << ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) - 1));
167 * Convert dataptr to a byte offset in a block
169 #define XFS_DIR2_DATAPTR_TO_OFF(mp,dp) xfs_dir2_dataptr_to_off(mp, dp)
170 static inline xfs_dir2_data_aoff_t
171 xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp)
173 return XFS_DIR2_BYTE_TO_OFF(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp));
177 * Convert block and offset to byte in space
179 #define XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o) \
180 xfs_dir2_db_off_to_byte(mp, db, o)
181 static inline xfs_dir2_off_t
182 xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db,
183 xfs_dir2_data_aoff_t o)
185 return ((xfs_dir2_off_t)(db) << \
186 ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o);
190 * Convert block (DB) to block (dablk)
192 #define XFS_DIR2_DB_TO_DA(mp,db) xfs_dir2_db_to_da(mp, db)
193 static inline xfs_dablk_t
194 xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db)
196 return (xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog);
200 * Convert byte in space to (DA) block
202 #define XFS_DIR2_BYTE_TO_DA(mp,by) xfs_dir2_byte_to_da(mp, by)
203 static inline xfs_dablk_t
204 xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by)
206 return XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, by));
210 * Convert block and offset to dataptr
212 #define XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o) \
213 xfs_dir2_db_off_to_dataptr(mp, db, o)
214 static inline xfs_dir2_dataptr_t
215 xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db,
216 xfs_dir2_data_aoff_t o)
218 return XFS_DIR2_BYTE_TO_DATAPTR(mp, XFS_DIR2_DB_OFF_TO_BYTE(mp, db, o));
222 * Convert block (dablk) to block (DB)
224 #define XFS_DIR2_DA_TO_DB(mp,da) xfs_dir2_da_to_db(mp, da)
225 static inline xfs_dir2_db_t
226 xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da)
228 return (xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog);
232 * Convert block (dablk) to byte offset in space
234 #define XFS_DIR2_DA_TO_BYTE(mp,da) xfs_dir2_da_to_byte(mp, da)
235 static inline xfs_dir2_off_t
236 xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da)
238 return XFS_DIR2_DB_OFF_TO_BYTE(mp, XFS_DIR2_DA_TO_DB(mp, da), 0);
242 * Function declarations.
244 extern int xfs_dir2_block_to_leaf(struct xfs_da_args *args,
245 struct xfs_dabuf *dbp);
246 extern int xfs_dir2_leaf_addname(struct xfs_da_args *args);
247 extern void xfs_dir2_leaf_compact(struct xfs_da_args *args,
248 struct xfs_dabuf *bp);
249 extern void xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp,
250 int *lowstalep, int *highstalep,
251 int *lowlogp, int *highlogp);
252 extern int xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
253 struct uio *uio, int *eofp,
254 struct xfs_dirent *dbp, xfs_dir2_put_t put);
255 extern int xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno,
256 struct xfs_dabuf **bpp, int magic);
257 extern void xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp,
258 int first, int last);
259 extern void xfs_dir2_leaf_log_header(struct xfs_trans *tp,
260 struct xfs_dabuf *bp);
261 extern int xfs_dir2_leaf_lookup(struct xfs_da_args *args);
262 extern int xfs_dir2_leaf_removename(struct xfs_da_args *args);
263 extern int xfs_dir2_leaf_replace(struct xfs_da_args *args);
264 extern int xfs_dir2_leaf_search_hash(struct xfs_da_args *args,
265 struct xfs_dabuf *lbp);
266 extern int xfs_dir2_leaf_trim_data(struct xfs_da_args *args,
267 struct xfs_dabuf *lbp, xfs_dir2_db_t db);
268 extern int xfs_dir2_node_to_leaf(struct xfs_da_state *state);
270 #endif /* __XFS_DIR2_LEAF_H__ */