2 * Copyright (c) 2000,2005 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_DATA_H__
19 #define __XFS_DIR2_DATA_H__
22 * Directory format 2, data block structures.
33 #define XFS_DIR2_DATA_MAGIC 0x58443244 /* XD2D: for multiblock dirs */
34 #define XFS_DIR2_DATA_ALIGN_LOG 3 /* i.e., 8 bytes */
35 #define XFS_DIR2_DATA_ALIGN (1 << XFS_DIR2_DATA_ALIGN_LOG)
36 #define XFS_DIR2_DATA_FREE_TAG 0xffff
37 #define XFS_DIR2_DATA_FD_COUNT 3
40 * Directory address space divided into sections,
41 * spaces separated by 32gb.
43 #define XFS_DIR2_SPACE_SIZE (1ULL << (32 + XFS_DIR2_DATA_ALIGN_LOG))
44 #define XFS_DIR2_DATA_SPACE 0
45 #define XFS_DIR2_DATA_OFFSET (XFS_DIR2_DATA_SPACE * XFS_DIR2_SPACE_SIZE)
46 #define XFS_DIR2_DATA_FIRSTDB(mp) \
47 XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATA_OFFSET)
50 * Offsets of . and .. in data space (always block 0)
52 #define XFS_DIR2_DATA_DOT_OFFSET \
53 ((xfs_dir2_data_aoff_t)sizeof(xfs_dir2_data_hdr_t))
54 #define XFS_DIR2_DATA_DOTDOT_OFFSET \
55 (XFS_DIR2_DATA_DOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(1))
56 #define XFS_DIR2_DATA_FIRST_OFFSET \
57 (XFS_DIR2_DATA_DOTDOT_OFFSET + XFS_DIR2_DATA_ENTSIZE(2))
64 * Describe a free area in the data block.
65 * The freespace will be formatted as a xfs_dir2_data_unused_t.
67 typedef struct xfs_dir2_data_free
{
68 xfs_dir2_data_off_t offset
; /* start of freespace */
69 xfs_dir2_data_off_t length
; /* length of freespace */
70 } xfs_dir2_data_free_t
;
73 * Header for the data blocks.
74 * Always at the beginning of a directory-sized block.
75 * The code knows that XFS_DIR2_DATA_FD_COUNT is 3.
77 typedef struct xfs_dir2_data_hdr
{
78 __uint32_t magic
; /* XFS_DIR2_DATA_MAGIC */
79 /* or XFS_DIR2_BLOCK_MAGIC */
80 xfs_dir2_data_free_t bestfree
[XFS_DIR2_DATA_FD_COUNT
];
81 } xfs_dir2_data_hdr_t
;
84 * Active entry in a data block. Aligned to 8 bytes.
85 * Tag appears as the last 2 bytes.
87 typedef struct xfs_dir2_data_entry
{
88 xfs_ino_t inumber
; /* inode number */
89 __uint8_t namelen
; /* name length */
90 __uint8_t name
[1]; /* name bytes, no null */
92 xfs_dir2_data_off_t tag
; /* starting offset of us */
93 } xfs_dir2_data_entry_t
;
96 * Unused entry in a data block. Aligned to 8 bytes.
97 * Tag appears as the last 2 bytes.
99 typedef struct xfs_dir2_data_unused
{
100 __uint16_t freetag
; /* XFS_DIR2_DATA_FREE_TAG */
101 xfs_dir2_data_off_t length
; /* total free length */
102 /* variable offset */
103 xfs_dir2_data_off_t tag
; /* starting offset of us */
104 } xfs_dir2_data_unused_t
;
107 xfs_dir2_data_entry_t entry
;
108 xfs_dir2_data_unused_t unused
;
109 } xfs_dir2_data_union_t
;
112 * Generic data block structure, for xfs_db.
114 typedef struct xfs_dir2_data
{
115 xfs_dir2_data_hdr_t hdr
; /* magic XFS_DIR2_DATA_MAGIC */
116 xfs_dir2_data_union_t u
[1];
124 * Size of a data entry.
126 #define XFS_DIR2_DATA_ENTSIZE(n) xfs_dir2_data_entsize(n)
127 static inline int xfs_dir2_data_entsize(int n
)
129 return (int)roundup(offsetof(xfs_dir2_data_entry_t
, name
[0]) + (n
) + \
130 (uint
)sizeof(xfs_dir2_data_off_t
), XFS_DIR2_DATA_ALIGN
);
134 * Pointer to an entry's tag word.
136 #define XFS_DIR2_DATA_ENTRY_TAG_P(dep) xfs_dir2_data_entry_tag_p(dep)
137 static inline xfs_dir2_data_off_t
*
138 xfs_dir2_data_entry_tag_p(xfs_dir2_data_entry_t
*dep
)
140 return (xfs_dir2_data_off_t
*) \
141 ((char *)(dep
) + XFS_DIR2_DATA_ENTSIZE((dep
)->namelen
) - \
142 (uint
)sizeof(xfs_dir2_data_off_t
));
146 * Pointer to a freespace's tag word.
148 #define XFS_DIR2_DATA_UNUSED_TAG_P(dup) \
149 xfs_dir2_data_unused_tag_p(dup)
150 static inline xfs_dir2_data_off_t
*
151 xfs_dir2_data_unused_tag_p(xfs_dir2_data_unused_t
*dup
)
153 return (xfs_dir2_data_off_t
*) \
154 ((char *)(dup
) + INT_GET((dup
)->length
, ARCH_CONVERT
) \
155 - (uint
)sizeof(xfs_dir2_data_off_t
));
159 * Function declarations.
162 extern void xfs_dir2_data_check(struct xfs_inode
*dp
, struct xfs_dabuf
*bp
);
164 #define xfs_dir2_data_check(dp,bp)
166 extern xfs_dir2_data_free_t
*xfs_dir2_data_freefind(xfs_dir2_data_t
*d
,
167 xfs_dir2_data_unused_t
*dup
);
168 extern xfs_dir2_data_free_t
*xfs_dir2_data_freeinsert(xfs_dir2_data_t
*d
,
169 xfs_dir2_data_unused_t
*dup
, int *loghead
);
170 extern void xfs_dir2_data_freescan(struct xfs_mount
*mp
, xfs_dir2_data_t
*d
,
171 int *loghead
, char *aendp
);
172 extern int xfs_dir2_data_init(struct xfs_da_args
*args
, xfs_dir2_db_t blkno
,
173 struct xfs_dabuf
**bpp
);
174 extern void xfs_dir2_data_log_entry(struct xfs_trans
*tp
, struct xfs_dabuf
*bp
,
175 xfs_dir2_data_entry_t
*dep
);
176 extern void xfs_dir2_data_log_header(struct xfs_trans
*tp
,
177 struct xfs_dabuf
*bp
);
178 extern void xfs_dir2_data_log_unused(struct xfs_trans
*tp
, struct xfs_dabuf
*bp
,
179 xfs_dir2_data_unused_t
*dup
);
180 extern void xfs_dir2_data_make_free(struct xfs_trans
*tp
, struct xfs_dabuf
*bp
,
181 xfs_dir2_data_aoff_t offset
,
182 xfs_dir2_data_aoff_t len
, int *needlogp
,
184 extern void xfs_dir2_data_use_free(struct xfs_trans
*tp
, struct xfs_dabuf
*bp
,
185 xfs_dir2_data_unused_t
*dup
,
186 xfs_dir2_data_aoff_t offset
,
187 xfs_dir2_data_aoff_t len
, int *needlogp
,
190 #endif /* __XFS_DIR2_DATA_H__ */