summaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_dmapi.h
blob: 55c17adaaa37d64e3c7b22be419bbd6398a9c428 (plain)
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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/*
 * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#ifndef __XFS_DMAPI_H__
#define __XFS_DMAPI_H__

/*	Values used to define the on-disk version of dm_attrname_t. All
 *	on-disk attribute names start with the 8-byte string "SGI_DMI_".
 *
 *      In the on-disk inode, DMAPI attribute names consist of the user-provided
 *      name with the DMATTR_PREFIXSTRING pre-pended.  This string must NEVER be
 *      changed.
 */

#define DMATTR_PREFIXLEN	8
#define DMATTR_PREFIXSTRING	"SGI_DMI_"

typedef enum {
	DM_EVENT_INVALID	= -1,
	DM_EVENT_CANCEL		= 0,		/* not supported */
	DM_EVENT_MOUNT		= 1,
	DM_EVENT_PREUNMOUNT	= 2,
	DM_EVENT_UNMOUNT	= 3,
	DM_EVENT_DEBUT		= 4,		/* not supported */
	DM_EVENT_CREATE		= 5,
	DM_EVENT_CLOSE		= 6,		/* not supported */
	DM_EVENT_POSTCREATE	= 7,
	DM_EVENT_REMOVE		= 8,
	DM_EVENT_POSTREMOVE	= 9,
	DM_EVENT_RENAME		= 10,
	DM_EVENT_POSTRENAME	= 11,
	DM_EVENT_LINK		= 12,
	DM_EVENT_POSTLINK	= 13,
	DM_EVENT_SYMLINK	= 14,
	DM_EVENT_POSTSYMLINK	= 15,
	DM_EVENT_READ		= 16,
	DM_EVENT_WRITE		= 17,
	DM_EVENT_TRUNCATE	= 18,
	DM_EVENT_ATTRIBUTE	= 19,
	DM_EVENT_DESTROY	= 20,
	DM_EVENT_NOSPACE	= 21,
	DM_EVENT_USER		= 22,
	DM_EVENT_MAX		= 23
} dm_eventtype_t;
#define HAVE_DM_EVENTTYPE_T

typedef enum {
	DM_RIGHT_NULL,
	DM_RIGHT_SHARED,
	DM_RIGHT_EXCL
} dm_right_t;
#define HAVE_DM_RIGHT_T

/* Defines for determining if an event message should be sent. */
#define	DM_EVENT_ENABLED(vfsp, ip, event) ( \
	unlikely ((vfsp)->vfs_flag & VFS_DMI) && \
		( ((ip)->i_d.di_dmevmask & (1 << event)) || \
		  ((ip)->i_mount->m_dmevmask & (1 << event)) ) \
	)

#define	DM_EVENT_ENABLED_IO(vfsp, io, event) ( \
	unlikely ((vfsp)->vfs_flag & VFS_DMI) && \
		( ((io)->io_dmevmask & (1 << event)) || \
		  ((io)->io_mount->m_dmevmask & (1 << event)) ) \
	)

#define DM_XFS_VALID_FS_EVENTS		( \
	(1 << DM_EVENT_PREUNMOUNT)	| \
	(1 << DM_EVENT_UNMOUNT)		| \
	(1 << DM_EVENT_NOSPACE)		| \
	(1 << DM_EVENT_DEBUT)		| \
	(1 << DM_EVENT_CREATE)		| \
	(1 << DM_EVENT_POSTCREATE)	| \
	(1 << DM_EVENT_REMOVE)		| \
	(1 << DM_EVENT_POSTREMOVE)	| \
	(1 << DM_EVENT_RENAME)		| \
	(1 << DM_EVENT_POSTRENAME)	| \
	(1 << DM_EVENT_LINK)		| \
	(1 << DM_EVENT_POSTLINK)	| \
	(1 << DM_EVENT_SYMLINK)		| \
	(1 << DM_EVENT_POSTSYMLINK)	| \
	(1 << DM_EVENT_ATTRIBUTE)	| \
	(1 << DM_EVENT_DESTROY)		)

/* Events valid in dm_set_eventlist() when called with a file handle for
   a regular file or a symlink.  These events are persistent.
*/

#define	DM_XFS_VALID_FILE_EVENTS	( \
	(1 << DM_EVENT_ATTRIBUTE)	| \
	(1 << DM_EVENT_DESTROY)		)

/* Events valid in dm_set_eventlist() when called with a file handle for
   a directory.  These events are persistent.
*/

#define	DM_XFS_VALID_DIRECTORY_EVENTS	( \
	(1 << DM_EVENT_CREATE)		| \
	(1 << DM_EVENT_POSTCREATE)	| \
	(1 << DM_EVENT_REMOVE)		| \
	(1 << DM_EVENT_POSTREMOVE)	| \
	(1 << DM_EVENT_RENAME)		| \
	(1 << DM_EVENT_POSTRENAME)	| \
	(1 << DM_EVENT_LINK)		| \
	(1 << DM_EVENT_POSTLINK)	| \
	(1 << DM_EVENT_SYMLINK)		| \
	(1 << DM_EVENT_POSTSYMLINK)	| \
	(1 << DM_EVENT_ATTRIBUTE)	| \
	(1 << DM_EVENT_DESTROY)		)

/* Events supported by the XFS filesystem. */
#define	DM_XFS_SUPPORTED_EVENTS		( \
	(1 << DM_EVENT_MOUNT)		| \
	(1 << DM_EVENT_PREUNMOUNT)	| \
	(1 << DM_EVENT_UNMOUNT)		| \
	(1 << DM_EVENT_NOSPACE)		| \
	(1 << DM_EVENT_CREATE)		| \
	(1 << DM_EVENT_POSTCREATE)	| \
	(1 << DM_EVENT_REMOVE)		| \
	(1 << DM_EVENT_POSTREMOVE)	| \
	(1 << DM_EVENT_RENAME)		| \
	(1 << DM_EVENT_POSTRENAME)	| \
	(1 << DM_EVENT_LINK)		| \
	(1 << DM_EVENT_POSTLINK)	| \
	(1 << DM_EVENT_SYMLINK)		| \
	(1 << DM_EVENT_POSTSYMLINK)	| \
	(1 << DM_EVENT_READ)		| \
	(1 << DM_EVENT_WRITE)		| \
	(1 << DM_EVENT_TRUNCATE)	| \
	(1 << DM_EVENT_ATTRIBUTE)	| \
	(1 << DM_EVENT_DESTROY)		)


/*
 *	Definitions used for the flags field on dm_send_*_event().
 */

#define DM_FLAGS_NDELAY		0x001	/* return EAGAIN after dm_pending() */
#define DM_FLAGS_UNWANTED	0x002	/* event not in fsys dm_eventset_t */
#define DM_FLAGS_ISEM		0x004	/* thread holds i_sem */
#define DM_FLAGS_IALLOCSEM_RD	0x010	/* thread holds i_alloc_sem rd */
#define DM_FLAGS_IALLOCSEM_WR	0x020	/* thread holds i_alloc_sem wr */

/*
 *	Based on IO_ISDIRECT, decide which i_ flag is set.
 */
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
#define DM_SEM_FLAG_RD(ioflags) (((ioflags) & IO_ISDIRECT) ? \
			      DM_FLAGS_ISEM : 0)
#define DM_SEM_FLAG_WR	(DM_FLAGS_IALLOCSEM_WR | DM_FLAGS_ISEM)
#endif

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)) && \
    (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,22))
#define DM_SEM_FLAG_RD(ioflags) (((ioflags) & IO_ISDIRECT) ? \
			      DM_FLAGS_IALLOCSEM_RD : DM_FLAGS_ISEM)
#define DM_SEM_FLAG_WR	(DM_FLAGS_IALLOCSEM_WR | DM_FLAGS_ISEM)
#endif

#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,21)
#define DM_SEM_FLAG_RD(ioflags) (((ioflags) & IO_ISDIRECT) ? \
			      0 : DM_FLAGS_ISEM)
#define DM_SEM_FLAG_WR	(DM_FLAGS_ISEM)
#endif


/*
 *	Macros to turn caller specified delay/block flags into
 *	dm_send_xxxx_event flag DM_FLAGS_NDELAY.
 */

#define FILP_DELAY_FLAG(filp) ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) ? \
			DM_FLAGS_NDELAY : 0)
#define AT_DELAY_FLAG(f) ((f&ATTR_NONBLOCK) ? DM_FLAGS_NDELAY : 0)


extern struct bhv_vfsops xfs_dmops;

#ifdef CONFIG_XFS_DMAPI
void xfs_dm_init(struct file_system_type *);
void xfs_dm_exit(struct file_system_type *);
#define XFS_DM_INIT(fstype)	xfs_dm_init(fstype)
#define XFS_DM_EXIT(fstype)	xfs_dm_exit(fstype)
#else
#define XFS_DM_INIT(fstype)
#define XFS_DM_EXIT(fstype)
#endif

#endif  /* __XFS_DMAPI_H__ */