2 * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
32 #ifndef __XFS_DIR2_DATA_H__
33 #define __XFS_DIR2_DATA_H__
36 * Directory format 2, data block structures.
47 #define XFS_DIR2_DATA_MAGIC 0x58443244 /* XD2D: for multiblock dirs */
48 #define XFS_DIR2_DATA_ALIGN_LOG 3 /* i.e., 8 bytes */
49 #define XFS_DIR2_DATA_ALIGN (1 << XFS_DIR2_DATA_ALIGN_LOG)
50 #define XFS_DIR2_DATA_FREE_TAG 0xffff
51 #define XFS_DIR2_DATA_FD_COUNT 3
54 * Directory address space divided into sections,
55 * spaces separated by 32gb.
57 #define XFS_DIR2_SPACE_SIZE (1ULL << (32 + XFS_DIR2_DATA_ALIGN_LOG))
58 #define XFS_DIR2_DATA_SPACE 0
59 #define XFS_DIR2_DATA_OFFSET (XFS_DIR2_DATA_SPACE * XFS_DIR2_SPACE_SIZE)
60 #define XFS_DIR2_DATA_FIRSTDB(mp) \
61 XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATA_OFFSET)
64 * Offsets of . and .. in data space (always block 0)
66 #define XFS_DIR2_DATA_DOT_OFFSET \
67 ((xfs_dir2_data_aoff_t)sizeof(xfs_dir2_data_hdr_t))
68 #define XFS_DIR2_DATA_DOTDOT_OFFSET \
69 (XFS_DIR2_DATA_DOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(1))
70 #define XFS_DIR2_DATA_FIRST_OFFSET \
71 (XFS_DIR2_DATA_DOTDOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(2))
78 * Describe a free area in the data block.
79 * The freespace will be formatted as a xfs_dir2_data_unused_t.
81 typedef struct xfs_dir2_data_free {
82 xfs_dir2_data_off_t offset; /* start of freespace */
83 xfs_dir2_data_off_t length; /* length of freespace */
84 } xfs_dir2_data_free_t;
87 * Header for the data blocks.
88 * Always at the beginning of a directory-sized block.
89 * The code knows that XFS_DIR2_DATA_FD_COUNT is 3.
91 typedef struct xfs_dir2_data_hdr {
92 __uint32_t magic; /* XFS_DIR2_DATA_MAGIC */
93 /* or XFS_DIR2_BLOCK_MAGIC */
94 xfs_dir2_data_free_t bestfree[XFS_DIR2_DATA_FD_COUNT];
95 } xfs_dir2_data_hdr_t;
98 * Active entry in a data block. Aligned to 8 bytes.
99 * Tag appears as the last 2 bytes.
101 typedef struct xfs_dir2_data_entry {
102 xfs_ino_t inumber; /* inode number */
103 __uint8_t namelen; /* name length */
104 __uint8_t name[1]; /* name bytes, no null */
105 /* variable offset */
106 xfs_dir2_data_off_t tag; /* starting offset of us */
107 } xfs_dir2_data_entry_t;
110 * Unused entry in a data block. Aligned to 8 bytes.
111 * Tag appears as the last 2 bytes.
113 typedef struct xfs_dir2_data_unused {
114 __uint16_t freetag; /* XFS_DIR2_DATA_FREE_TAG */
115 xfs_dir2_data_off_t length; /* total free length */
116 /* variable offset */
117 xfs_dir2_data_off_t tag; /* starting offset of us */
118 } xfs_dir2_data_unused_t;
121 xfs_dir2_data_entry_t entry;
122 xfs_dir2_data_unused_t unused;
123 } xfs_dir2_data_union_t;
126 * Generic data block structure, for xfs_db.
128 typedef struct xfs_dir2_data {
129 xfs_dir2_data_hdr_t hdr; /* magic XFS_DIR2_DATA_MAGIC */
130 xfs_dir2_data_union_t u[1];
138 * Size of a data entry.
140 #if XFS_WANT_FUNCS || XFS_WANT_FUNCS_C || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTSIZE)
141 int xfs_dir2_data_entsize(int n);
144 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTSIZE)
145 #define XFS_DIR2_DATA_ENTSIZE(n) xfs_dir2_data_entsize(n)
147 #define XFS_DIR2_DATA_ENTSIZE(n) \
148 ((int)(roundup(offsetof(xfs_dir2_data_entry_t, name[0]) + (n) + \
149 (uint)sizeof(xfs_dir2_data_off_t), XFS_DIR2_DATA_ALIGN)))
153 * Pointer to an entry's tag word.
155 #if XFS_WANT_FUNCS || XFS_WANT_FUNCS_C || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTRY_TAG_P)
156 xfs_dir2_data_off_t *xfs_dir2_data_entry_tag_p(xfs_dir2_data_entry_t *dep);
159 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_ENTRY_TAG_P)
160 #define XFS_DIR2_DATA_ENTRY_TAG_P(dep) xfs_dir2_data_entry_tag_p(dep)
162 #define XFS_DIR2_DATA_ENTRY_TAG_P(dep) \
163 ((xfs_dir2_data_off_t *)\
164 ((char *)(dep) + XFS_DIR2_DATA_ENTSIZE((dep)->namelen) - \
165 (uint)sizeof(xfs_dir2_data_off_t)))
169 * Pointer to a freespace's tag word.
171 #if XFS_WANT_FUNCS || XFS_WANT_FUNCS_C || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_UNUSED_TAG_P)
172 xfs_dir2_data_off_t *xfs_dir2_data_unused_tag_p_arch(
173 xfs_dir2_data_unused_t *dup, xfs_arch_t arch);
176 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_DIR2_DATA_UNUSED_TAG_P)
177 #define XFS_DIR2_DATA_UNUSED_TAG_P_ARCH(dup,arch) \
178 xfs_dir2_data_unused_tag_p_arch(dup,arch)
180 #define XFS_DIR2_DATA_UNUSED_TAG_P_ARCH(dup,arch) \
181 ((xfs_dir2_data_off_t *)\
182 ((char *)(dup) + INT_GET((dup)->length, arch) \
183 - (uint)sizeof(xfs_dir2_data_off_t)))
187 * Function declarations.
192 xfs_dir2_data_check(struct xfs_inode *dp, struct xfs_dabuf *bp);
194 #define xfs_dir2_data_check(dp,bp)
197 extern xfs_dir2_data_free_t *
198 xfs_dir2_data_freefind(xfs_dir2_data_t *d,
199 xfs_dir2_data_unused_t *dup);
201 extern xfs_dir2_data_free_t *
202 xfs_dir2_data_freeinsert(xfs_dir2_data_t *d,
203 xfs_dir2_data_unused_t *dup, int *loghead);
206 xfs_dir2_data_freeremove(xfs_dir2_data_t *d,
207 xfs_dir2_data_free_t *dfp, int *loghead);
210 xfs_dir2_data_freescan(struct xfs_mount *mp, xfs_dir2_data_t *d,
211 int *loghead, char *aendp);
214 xfs_dir2_data_init(struct xfs_da_args *args, xfs_dir2_db_t blkno,
215 struct xfs_dabuf **bpp);
218 xfs_dir2_data_log_entry(struct xfs_trans *tp, struct xfs_dabuf *bp,
219 xfs_dir2_data_entry_t *dep);
222 xfs_dir2_data_log_header(struct xfs_trans *tp, struct xfs_dabuf *bp);
225 xfs_dir2_data_log_unused(struct xfs_trans *tp, struct xfs_dabuf *bp,
226 xfs_dir2_data_unused_t *dup);
229 xfs_dir2_data_make_free(struct xfs_trans *tp, struct xfs_dabuf *bp,
230 xfs_dir2_data_aoff_t offset,
231 xfs_dir2_data_aoff_t len, int *needlogp,
235 xfs_dir2_data_use_free(struct xfs_trans *tp, struct xfs_dabuf *bp,
236 xfs_dir2_data_unused_t *dup,
237 xfs_dir2_data_aoff_t offset,
238 xfs_dir2_data_aoff_t len, int *needlogp,
241 #endif /* __XFS_DIR2_DATA_H__ */