2 * dir.c - Operations for sysfs directories.
8 #include <linux/mount.h>
9 #include <linux/module.h>
10 #include <linux/kobject.h>
13 static int init_dir(struct inode * inode)
15 inode->i_op = &simple_dir_inode_operations;
16 inode->i_fop = &simple_dir_operations;
18 /* directory inodes start off with i_nlink == 2 (for "." entry) */
24 static int create_dir(struct kobject * k, struct dentry * p,
25 const char * n, struct dentry ** d)
29 down(&p->d_inode->i_sem);
30 *d = sysfs_get_dentry(p,n);
32 error = sysfs_create(*d,
33 S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO,
37 p->d_inode->i_nlink++;
42 up(&p->d_inode->i_sem);
47 int sysfs_create_subdir(struct kobject * k, const char * n, struct dentry ** d)
49 return create_dir(k,k->dentry,n,d);
53 * sysfs_create_dir - create a directory for an object.
54 * @parent: parent parent object.
55 * @kobj: object we're creating directory for.
58 int sysfs_create_dir(struct kobject * kobj)
60 struct dentry * dentry = NULL;
61 struct dentry * parent;
68 parent = kobj->parent->dentry;
69 else if (sysfs_mount && sysfs_mount->mnt_sb)
70 parent = sysfs_mount->mnt_sb->s_root;
74 error = create_dir(kobj,parent,kobject_name(kobj),&dentry);
76 kobj->dentry = dentry;
81 static void remove_dir(struct dentry * d)
83 struct dentry * parent = dget(d->d_parent);
84 down(&parent->d_inode->i_sem);
87 simple_rmdir(parent->d_inode,d);
89 pr_debug(" o %s removing done (%d)\n",d->d_name.name,
90 atomic_read(&d->d_count));
92 up(&parent->d_inode->i_sem);
96 void sysfs_remove_subdir(struct dentry * d)
103 * sysfs_remove_dir - remove an object's directory.
106 * The only thing special about this is that we remove any files in
107 * the directory before we remove the directory, and we've inlined
108 * what used to be sysfs_rmdir() below, instead of calling separately.
111 void sysfs_remove_dir(struct kobject * kobj)
113 struct list_head * node;
114 struct dentry * dentry = dget(kobj->dentry);
119 pr_debug("sysfs %s: removing dir\n",dentry->d_name.name);
120 down(&dentry->d_inode->i_sem);
122 spin_lock(&dcache_lock);
124 node = dentry->d_subdirs.next;
125 while (node != &dentry->d_subdirs) {
126 struct dentry * d = list_entry(node,struct dentry,d_child);
129 pr_debug(" o %s (%d): ",d->d_name.name,atomic_read(&d->d_count));
130 if (!d_unhashed(d) && (d->d_inode)) {
132 pr_debug("removing");
137 spin_unlock(&dcache_lock);
139 simple_unlink(dentry->d_inode,d);
142 spin_lock(&dcache_lock);
143 /* re-acquired dcache_lock, need to restart */
147 spin_unlock(&dcache_lock);
148 up(&dentry->d_inode->i_sem);
152 * Drop reference from dget() on entrance.
157 void sysfs_rename_dir(struct kobject * kobj, const char *new_name)
159 struct dentry * new_dentry, * parent;
161 if (!strcmp(kobject_name(kobj), new_name))
167 parent = kobj->parent->dentry;
169 down(&parent->d_inode->i_sem);
171 new_dentry = sysfs_get_dentry(parent, new_name);
172 d_move(kobj->dentry, new_dentry);
173 kobject_set_name(kobj,new_name);
174 up(&parent->d_inode->i_sem);
177 EXPORT_SYMBOL(sysfs_create_dir);
178 EXPORT_SYMBOL(sysfs_remove_dir);
179 EXPORT_SYMBOL(sysfs_rename_dir);