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 if (kobj->ktype == NULL || kobj->ktype->sysfs_ops == NULL)
86 buf = (char *)get_zeroed_page(GFP_KERNEL);
89 ops = kobj->ktype->sysfs_ops;
91 len = ops->show(kobj, attr, buf);
93 * It's valid to not have a 'show' so just return an
103 if (len >= PAGE_SIZE)
105 /* Trim trailing newline. */
110 /* Leave one trailing byte to append a newline. */
111 error = sysctl_handle_string(oidp, buf, PAGE_SIZE - 1, req);
112 if (error != 0 || req->newptr == NULL || ops->store == NULL)
114 len = strlcat(buf, "\n", PAGE_SIZE);
115 KASSERT(len < PAGE_SIZE, ("new attribute truncated"));
116 len = ops->store(kobj, attr, buf, len);
120 free_page((unsigned long)buf);
126 sysfs_create_file(struct kobject *kobj, const struct attribute *attr)
129 sysctl_add_oid(NULL, SYSCTL_CHILDREN(kobj->oidp), OID_AUTO,
130 attr->name, CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_MPSAFE, kobj,
131 (uintptr_t)attr, sysctl_handle_attr, "A", "");
137 sysfs_remove_file(struct kobject *kobj, const struct attribute *attr)
141 sysctl_remove_name(kobj->oidp, attr->name, 1, 1);
145 sysfs_remove_group(struct kobject *kobj, const struct attribute_group *grp)
149 sysctl_remove_name(kobj->oidp, grp->name, 1, 1);
153 sysfs_create_group(struct kobject *kobj, const struct attribute_group *grp)
155 struct attribute **attr;
156 struct sysctl_oid *oidp;
158 oidp = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(kobj->oidp),
159 OID_AUTO, grp->name, CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, grp->name);
160 for (attr = grp->attrs; *attr != NULL; attr++) {
161 sysctl_add_oid(NULL, SYSCTL_CHILDREN(oidp), OID_AUTO,
162 (*attr)->name, CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_MPSAFE,
163 kobj, (uintptr_t)*attr, sysctl_handle_attr, "A", "");
170 sysfs_create_dir(struct kobject *kobj)
173 kobj->oidp = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(kobj->parent->oidp),
174 OID_AUTO, kobj->name, CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, kobj->name);
180 sysfs_remove_dir(struct kobject *kobj)
183 if (kobj->oidp == NULL)
185 sysctl_remove_oid(kobj->oidp, 1, 1);
188 #define sysfs_attr_init(attr) do {} while(0)
190 #endif /* _LINUX_SYSFS_H_ */