Blame view
fs/configfs/item.c
5.43 KB
7063fbf22 [PATCH] configfs:... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 |
/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * item.c - library routines for handling generic config items * * 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; either * version 2 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will 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 to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. * * Based on kobject: |
f6b1fe7c2 fs/configs/item.c... |
22 |
* kobject is Copyright (c) 2002-2003 Patrick Mochel |
7063fbf22 [PATCH] configfs:... |
23 24 25 |
* * configfs Copyright (C) 2005 Oracle. All rights reserved. * |
395cf9691 doc: fix broken r... |
26 |
* Please see the file Documentation/filesystems/configfs/configfs.txt for |
7063fbf22 [PATCH] configfs:... |
27 28 29 30 31 32 33 34 35 |
* critical information about using the config_item interface. */ #include <linux/string.h> #include <linux/module.h> #include <linux/stat.h> #include <linux/slab.h> #include <linux/configfs.h> |
f6b1fe7c2 fs/configs/item.c... |
36 |
static inline struct config_item *to_item(struct list_head *entry) |
7063fbf22 [PATCH] configfs:... |
37 |
{ |
f6b1fe7c2 fs/configs/item.c... |
38 |
return container_of(entry, struct config_item, ci_entry); |
7063fbf22 [PATCH] configfs:... |
39 40 41 42 43 44 45 46 47 |
} /* Evil kernel */ static void config_item_release(struct kref *kref); /** * config_item_init - initialize item. * @item: item in question. */ |
5286d20c4 configfs: unexpor... |
48 |
static void config_item_init(struct config_item *item) |
7063fbf22 [PATCH] configfs:... |
49 50 51 52 53 54 55 56 |
{ kref_init(&item->ci_kref); INIT_LIST_HEAD(&item->ci_entry); } /** * config_item_set_name - Set the name of an item * @item: item. |
f6b1fe7c2 fs/configs/item.c... |
57 |
* @fmt: The vsnprintf()'s format string. |
7063fbf22 [PATCH] configfs:... |
58 59 60 61 62 |
* * If strlen(name) >= CONFIGFS_ITEM_NAME_LEN, then use a * dynamically allocated string that @item->ci_name points to. * Otherwise, use the static @item->ci_namebuf array. */ |
f6b1fe7c2 fs/configs/item.c... |
63 |
int config_item_set_name(struct config_item *item, const char *fmt, ...) |
7063fbf22 [PATCH] configfs:... |
64 65 66 67 68 |
{ int error = 0; int limit = CONFIGFS_ITEM_NAME_LEN; int need; va_list args; |
f6b1fe7c2 fs/configs/item.c... |
69 |
char *name; |
7063fbf22 [PATCH] configfs:... |
70 71 72 73 |
/* * First, try the static array */ |
f6b1fe7c2 fs/configs/item.c... |
74 75 |
va_start(args, fmt); need = vsnprintf(item->ci_namebuf, limit, fmt, args); |
7063fbf22 [PATCH] configfs:... |
76 77 78 79 80 81 82 83 |
va_end(args); if (need < limit) name = item->ci_namebuf; else { /* * Need more space? Allocate it and try again */ limit = need + 1; |
f6b1fe7c2 fs/configs/item.c... |
84 |
name = kmalloc(limit, GFP_KERNEL); |
7063fbf22 [PATCH] configfs:... |
85 86 87 88 |
if (!name) { error = -ENOMEM; goto Done; } |
f6b1fe7c2 fs/configs/item.c... |
89 90 |
va_start(args, fmt); need = vsnprintf(name, limit, fmt, args); |
7063fbf22 [PATCH] configfs:... |
91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 |
va_end(args); /* Still? Give up. */ if (need >= limit) { kfree(name); error = -EFAULT; goto Done; } } /* Free the old name, if necessary. */ if (item->ci_name && item->ci_name != item->ci_namebuf) kfree(item->ci_name); /* Now, set the new name */ item->ci_name = name; Done: return error; } |
7063fbf22 [PATCH] configfs:... |
110 111 112 113 114 115 |
EXPORT_SYMBOL(config_item_set_name); void config_item_init_type_name(struct config_item *item, const char *name, struct config_item_type *type) { |
3958b7926 configfs: fix ker... |
116 |
config_item_set_name(item, "%s", name); |
7063fbf22 [PATCH] configfs:... |
117 118 119 120 121 122 123 124 |
item->ci_type = type; config_item_init(item); } EXPORT_SYMBOL(config_item_init_type_name); void config_group_init_type_name(struct config_group *group, const char *name, struct config_item_type *type) { |
3958b7926 configfs: fix ker... |
125 |
config_item_set_name(&group->cg_item, "%s", name); |
7063fbf22 [PATCH] configfs:... |
126 127 128 129 |
group->cg_item.ci_type = type; config_group_init(group); } EXPORT_SYMBOL(config_group_init_type_name); |
f6b1fe7c2 fs/configs/item.c... |
130 |
struct config_item *config_item_get(struct config_item *item) |
7063fbf22 [PATCH] configfs:... |
131 132 133 134 135 |
{ if (item) kref_get(&item->ci_kref); return item; } |
f6b1fe7c2 fs/configs/item.c... |
136 |
EXPORT_SYMBOL(config_item_get); |
7063fbf22 [PATCH] configfs:... |
137 |
|
f6b1fe7c2 fs/configs/item.c... |
138 |
static void config_item_cleanup(struct config_item *item) |
7063fbf22 [PATCH] configfs:... |
139 |
{ |
f6b1fe7c2 fs/configs/item.c... |
140 141 142 |
struct config_item_type *t = item->ci_type; struct config_group *s = item->ci_group; struct config_item *parent = item->ci_parent; |
7063fbf22 [PATCH] configfs:... |
143 |
|
f6b1fe7c2 fs/configs/item.c... |
144 145 |
pr_debug("config_item %s: cleaning up ", config_item_name(item)); |
7063fbf22 [PATCH] configfs:... |
146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 |
if (item->ci_name != item->ci_namebuf) kfree(item->ci_name); item->ci_name = NULL; if (t && t->ct_item_ops && t->ct_item_ops->release) t->ct_item_ops->release(item); if (s) config_group_put(s); if (parent) config_item_put(parent); } static void config_item_release(struct kref *kref) { config_item_cleanup(container_of(kref, struct config_item, ci_kref)); } /** * config_item_put - decrement refcount for item. * @item: item. * * Decrement the refcount, and if 0, call config_item_cleanup(). */ |
f6b1fe7c2 fs/configs/item.c... |
168 |
void config_item_put(struct config_item *item) |
7063fbf22 [PATCH] configfs:... |
169 170 171 172 |
{ if (item) kref_put(&item->ci_kref, config_item_release); } |
f6b1fe7c2 fs/configs/item.c... |
173 |
EXPORT_SYMBOL(config_item_put); |
7063fbf22 [PATCH] configfs:... |
174 |
|
7063fbf22 [PATCH] configfs:... |
175 176 |
/** * config_group_init - initialize a group for use |
f6b1fe7c2 fs/configs/item.c... |
177 |
* @group: config_group |
7063fbf22 [PATCH] configfs:... |
178 |
*/ |
7063fbf22 [PATCH] configfs:... |
179 180 181 182 |
void config_group_init(struct config_group *group) { config_item_init(&group->cg_item); INIT_LIST_HEAD(&group->cg_children); |
1ae1602de configfs: switch ... |
183 |
INIT_LIST_HEAD(&group->default_groups); |
7063fbf22 [PATCH] configfs:... |
184 |
} |
f6b1fe7c2 fs/configs/item.c... |
185 |
EXPORT_SYMBOL(config_group_init); |
7063fbf22 [PATCH] configfs:... |
186 |
|
7063fbf22 [PATCH] configfs:... |
187 |
/** |
3fe6c5ce1 [PATCH] configfs+... |
188 |
* config_group_find_item - search for item in group. |
7063fbf22 [PATCH] configfs:... |
189 190 191 |
* @group: group we're looking in. * @name: item's name. * |
3fe6c5ce1 [PATCH] configfs+... |
192 193 194 |
* Iterate over @group->cg_list, looking for a matching config_item. * If matching item is found take a reference and return the item. * Caller must have locked group via @group->cg_subsys->su_mtx. |
7063fbf22 [PATCH] configfs:... |
195 |
*/ |
3fe6c5ce1 [PATCH] configfs+... |
196 197 |
struct config_item *config_group_find_item(struct config_group *group, const char *name) |
7063fbf22 [PATCH] configfs:... |
198 |
{ |
f6b1fe7c2 fs/configs/item.c... |
199 200 |
struct list_head *entry; struct config_item *ret = NULL; |
7063fbf22 [PATCH] configfs:... |
201 |
|
f6b1fe7c2 fs/configs/item.c... |
202 203 |
list_for_each(entry, &group->cg_children) { struct config_item *item = to_item(entry); |
7063fbf22 [PATCH] configfs:... |
204 |
if (config_item_name(item) && |
3fe6c5ce1 [PATCH] configfs+... |
205 |
!strcmp(config_item_name(item), name)) { |
7063fbf22 [PATCH] configfs:... |
206 207 208 209 210 211 |
ret = config_item_get(item); break; } } return ret; } |
3fe6c5ce1 [PATCH] configfs+... |
212 |
EXPORT_SYMBOL(config_group_find_item); |