2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #ifndef _LINUX_SYSFS_H_
30 #define _LINUX_SYSFS_H_
32 #include <sys/sysctl.h>
41 ssize_t (*show)(struct kobject *, struct attribute *, char *);
42 ssize_t (*store)(struct kobject *, struct attribute *, const char *,
46 struct attribute_group {
48 mode_t (*is_visible)(struct kobject *,
49 struct attribute *, int);
50 struct attribute **attrs;
53 #define __ATTR(_name, _mode, _show, _store) { \
54 .attr = { .name = __stringify(_name), .mode = _mode }, \
55 .show = _show, .store = _store, \
58 #define __ATTR_RO(_name) { \
59 .attr = { .name = __stringify(_name), .mode = 0444 }, \
60 .show = _name##_show, \
63 #define __ATTR_NULL { .attr = { .name = NULL } }
66 * Handle our generic '\0' terminated 'C' string.
68 * a variable string: point arg1 at it, arg2 is max length.
69 * a constant string: point arg1 at it, arg2 is zero.
73 sysctl_handle_attr(SYSCTL_HANDLER_ARGS)
76 struct attribute *attr;
77 const struct sysfs_ops *ops;
83 attr = (struct attribute *)arg2;
84 buf = (void *)get_zeroed_page(GFP_KERNEL);
85 len = 1; /* Copy out a NULL byte at least. */
86 if (kobj->ktype == NULL || kobj->ktype->sysfs_ops == NULL)
88 ops = kobj->ktype->sysfs_ops;
92 len = ops->show(kobj, attr, buf);
94 * It's valid not to have a 'show' so we just return 1 byte
104 error = SYSCTL_OUT(req, buf, len);
105 if (error || !req->newptr || ops->store == NULL)
107 error = SYSCTL_IN(req, buf, PAGE_SIZE);
110 len = ops->store(kobj, attr, buf, req->newlen);
114 free_page((unsigned long)buf);
120 sysfs_create_file(struct kobject *kobj, const struct attribute *attr)
123 sysctl_add_oid(NULL, SYSCTL_CHILDREN(kobj->oidp), OID_AUTO,
124 attr->name, CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_MPSAFE, kobj,
125 (uintptr_t)attr, sysctl_handle_attr, "A", "");
131 sysfs_remove_file(struct kobject *kobj, const struct attribute *attr)
135 sysctl_remove_name(kobj->oidp, attr->name, 1, 1);
139 sysfs_remove_group(struct kobject *kobj, const struct attribute_group *grp)
143 sysctl_remove_name(kobj->oidp, grp->name, 1, 1);
147 sysfs_create_group(struct kobject *kobj, const struct attribute_group *grp)
149 struct attribute **attr;
150 struct sysctl_oid *oidp;
152 oidp = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(kobj->oidp),
153 OID_AUTO, grp->name, CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, grp->name);
154 for (attr = grp->attrs; *attr != NULL; attr++) {
155 sysctl_add_oid(NULL, SYSCTL_CHILDREN(oidp), OID_AUTO,
156 (*attr)->name, CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_MPSAFE,
157 kobj, (uintptr_t)*attr, sysctl_handle_attr, "A", "");
164 sysfs_create_dir(struct kobject *kobj)
167 kobj->oidp = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(kobj->parent->oidp),
168 OID_AUTO, kobj->name, CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, kobj->name);
174 sysfs_remove_dir(struct kobject *kobj)
177 if (kobj->oidp == NULL)
179 sysctl_remove_oid(kobj->oidp, 1, 1);
182 #endif /* _LINUX_SYSFS_H_ */