#include "sysfs.h"
-static struct inode_operations sysfs_symlink_inode_operations = {
- .readlink = generic_readlink,
- .follow_link = sysfs_follow_link,
- .put_link = sysfs_put_link,
-};
-
-static int init_symlink(struct inode * inode)
-{
- inode->i_op = &sysfs_symlink_inode_operations;
- return 0;
-}
-
static int object_depth(struct kobject * kobj)
{
struct kobject * p = kobj;
}
}
+static int sysfs_add_link(struct dentry * parent, char * name, struct kobject * target)
+{
+ struct sysfs_dirent * parent_sd = parent->d_fsdata;
+ struct sysfs_symlink * sl;
+ int error = 0;
+
+ error = -ENOMEM;
+ sl = kmalloc(sizeof(*sl), GFP_KERNEL);
+ if (!sl)
+ goto exit1;
+
+ sl->link_name = kmalloc(strlen(name) + 1, GFP_KERNEL);
+ if (!sl->link_name)
+ goto exit2;
+
+ strcpy(sl->link_name, name);
+ sl->target_kobj = kobject_get(target);
+
+ error = sysfs_make_dirent(parent_sd, NULL, sl, S_IFLNK|S_IRWXUGO,
+ SYSFS_KOBJ_LINK);
+ if (!error)
+ return 0;
+
+ kfree(sl->link_name);
+exit2:
+ kfree(sl);
+exit1:
+ return error;
+}
+
/**
* sysfs_create_link - create symlink between two objects.
* @kobj: object whose directory we're creating the link in.
int sysfs_create_link(struct kobject * kobj, struct kobject * target, char * name)
{
struct dentry * dentry = kobj->dentry;
- struct dentry * d;
int error = 0;
+ BUG_ON(!kobj || !kobj->dentry || !name);
+
down(&dentry->d_inode->i_sem);
- d = sysfs_get_dentry(dentry,name);
- if (!IS_ERR(d)) {
- error = sysfs_create(d, S_IFLNK|S_IRWXUGO, init_symlink);
- if (!error)
- /*
- * associate the link dentry with the target kobject
- */
- d->d_fsdata = kobject_get(target);
- dput(d);
- } else
- error = PTR_ERR(d);
+ error = sysfs_add_link(dentry, name, target);
up(&dentry->d_inode->i_sem);
return error;
}
}
-int sysfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+static int sysfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
int error = -ENOMEM;
unsigned long page = get_zeroed_page(GFP_KERNEL);
return 0;
}
-void sysfs_put_link(struct dentry *dentry, struct nameidata *nd)
+static void sysfs_put_link(struct dentry *dentry, struct nameidata *nd)
{
char *page = nd_get_link(nd);
if (!IS_ERR(page))
free_page((unsigned long)page);
}
-EXPORT_SYMBOL(sysfs_create_link);
-EXPORT_SYMBOL(sysfs_remove_link);
+struct inode_operations sysfs_symlink_inode_operations = {
+ .readlink = generic_readlink,
+ .follow_link = sysfs_follow_link,
+ .put_link = sysfs_put_link,
+};
+
+
+EXPORT_SYMBOL_GPL(sysfs_create_link);
+EXPORT_SYMBOL_GPL(sysfs_remove_link);