aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_dir_sf.h
blob: 5b20b4d3f57ddba2423cf0e8a3d4cccbab5cbc90 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_DIR_SF_H__
#define	__XFS_DIR_SF_H__

/*
 * Directory layout when stored internal to an inode.
 *
 * Small directories are packed as tightly as possible so as to
 * fit into the literal area of the inode.
 */

typedef struct { __uint8_t i[sizeof(xfs_ino_t)]; } xfs_dir_ino_t;

/*
 * The parent directory has a dedicated field, and the self-pointer must
 * be calculated on the fly.
 *
 * Entries are packed toward the top as tight as possible.  The header
 * and the elements much be memcpy'd out into a work area to get correct
 * alignment for the inode number fields.
 */
typedef struct xfs_dir_sf_hdr {		/* constant-structure header block */
	xfs_dir_ino_t	parent;		/* parent dir inode number */
	__uint8_t	count;		/* count of active entries */
} xfs_dir_sf_hdr_t;

typedef struct xfs_dir_sf_entry {
	xfs_dir_ino_t	inumber;	/* referenced inode number */
	__uint8_t	namelen;	/* actual length of name (no NULL) */
	__uint8_t	name[1];	/* name */
} xfs_dir_sf_entry_t;

typedef struct xfs_dir_shortform {
	xfs_dir_sf_hdr_t	hdr;
	xfs_dir_sf_entry_t	list[1];	/* variable sized array */
} xfs_dir_shortform_t;

/*
 * We generate this then sort it, so that readdirs are returned in
 * hash-order.  Else seekdir won't work.
 */
typedef struct xfs_dir_sf_sort {
	__uint8_t	entno;		/* .=0, ..=1, else entry# + 2 */
	__uint8_t	seqno;		/* sequence # with same hash value */
	__uint8_t	namelen;	/* length of name value (no null) */
	xfs_dahash_t	hash;		/* this entry's hash value */
	xfs_intino_t	ino;		/* this entry's inode number */
	char		*name;		/* name value, pointer into buffer */
} xfs_dir_sf_sort_t;

#define	XFS_DIR_SF_GET_DIRINO(from,to)	xfs_dir_sf_get_dirino(from, to)
static inline void xfs_dir_sf_get_dirino(xfs_dir_ino_t *from, xfs_ino_t *to)
{
	*(to) = XFS_GET_DIR_INO8(*from);
}

#define	XFS_DIR_SF_PUT_DIRINO(from,to)	xfs_dir_sf_put_dirino(from, to)
static inline void xfs_dir_sf_put_dirino(xfs_ino_t *from, xfs_dir_ino_t *to)
{
	XFS_PUT_DIR_INO8(*(from), *(to));
}

#define XFS_DIR_SF_ENTSIZE_BYNAME(len)	xfs_dir_sf_entsize_byname(len)
static inline int xfs_dir_sf_entsize_byname(int len)
{
	return (uint)sizeof(xfs_dir_sf_entry_t)-1 + (len);
}

#define XFS_DIR_SF_ENTSIZE_BYENTRY(sfep)	xfs_dir_sf_entsize_byentry(sfep)
static inline int xfs_dir_sf_entsize_byentry(xfs_dir_sf_entry_t *sfep)
{
	return (uint)sizeof(xfs_dir_sf_entry_t)-1 + (sfep)->namelen;
}

#define XFS_DIR_SF_NEXTENTRY(sfep)		xfs_dir_sf_nextentry(sfep)
static inline xfs_dir_sf_entry_t *xfs_dir_sf_nextentry(xfs_dir_sf_entry_t *sfep)
{
	return (xfs_dir_sf_entry_t *) \
		((char *)(sfep) + XFS_DIR_SF_ENTSIZE_BYENTRY(sfep));
}

#define XFS_DIR_SF_ALLFIT(count,totallen)	\
	xfs_dir_sf_allfit(count,totallen)
static inline int xfs_dir_sf_allfit(int count, int totallen)
{
	return ((uint)sizeof(xfs_dir_sf_hdr_t) + \
	       ((uint)sizeof(xfs_dir_sf_entry_t)-1)*(count) + (totallen));
}

#if defined(XFS_DIR_TRACE)

/*
 * Kernel tracing support for directories.
 */
struct uio;
struct xfs_inode;
struct xfs_da_intnode;
struct xfs_dinode;
struct xfs_dir_leafblock;
struct xfs_dir_leaf_entry;

#define	XFS_DIR_TRACE_SIZE	4096	/* size of global trace buffer */
extern ktrace_t	*xfs_dir_trace_buf;

/*
 * Trace record types.
 */
#define	XFS_DIR_KTRACE_G_DU	1	/* dp, uio */
#define	XFS_DIR_KTRACE_G_DUB	2	/* dp, uio, bno */
#define	XFS_DIR_KTRACE_G_DUN	3	/* dp, uio, node */
#define	XFS_DIR_KTRACE_G_DUL	4	/* dp, uio, leaf */
#define	XFS_DIR_KTRACE_G_DUE	5	/* dp, uio, leaf entry */
#define	XFS_DIR_KTRACE_G_DUC	6	/* dp, uio, cookie */

void xfs_dir_trace_g_du(char *where, struct xfs_inode *dp, struct uio *uio);
void xfs_dir_trace_g_dub(char *where, struct xfs_inode *dp, struct uio *uio,
			      xfs_dablk_t bno);
void xfs_dir_trace_g_dun(char *where, struct xfs_inode *dp, struct uio *uio,
			      struct xfs_da_intnode *node);
void xfs_dir_trace_g_dul(char *where, struct xfs_inode *dp, struct uio *uio,
			      struct xfs_dir_leafblock *leaf);
void xfs_dir_trace_g_due(char *where, struct xfs_inode *dp, struct uio *uio,
			      struct xfs_dir_leaf_entry *entry);
void xfs_dir_trace_g_duc(char *where, struct xfs_inode *dp, struct uio *uio,
			      xfs_off_t cookie);
void xfs_dir_trace_enter(int type, char *where,
			     void *a0, void *a1, void *a2, void *a3,
			     void *a4, void *a5, void *a6, void *a7,
			     void *a8, void *a9, void *a10, void *a11);
#else
#define	xfs_dir_trace_g_du(w,d,u)
#define	xfs_dir_trace_g_dub(w,d,u,b)
#define	xfs_dir_trace_g_dun(w,d,u,n)
#define	xfs_dir_trace_g_dul(w,d,u,l)
#define	xfs_dir_trace_g_due(w,d,u,e)
#define	xfs_dir_trace_g_duc(w,d,u,c)
#endif /* DEBUG */

#endif	/* __XFS_DIR_SF_H__ */