2 * mount.c - operations for initializing and mounting sysfs.
8 #include <linux/mount.h>
9 #include <linux/pagemap.h>
10 #include <linux/init.h>
14 /* Random magic number */
15 #define SYSFS_MAGIC 0x62656572
17 struct vfsmount *sysfs_mount;
18 struct super_block * sysfs_sb = NULL;
20 static struct super_operations sysfs_ops = {
21 .statfs = simple_statfs,
22 .drop_inode = generic_delete_inode,
25 static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
30 sb->s_blocksize = PAGE_CACHE_SIZE;
31 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
32 sb->s_magic = SYSFS_MAGIC;
33 sb->s_op = &sysfs_ops;
36 inode = sysfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO);
38 inode->i_op = &simple_dir_inode_operations;
39 inode->i_fop = &simple_dir_operations;
40 /* directory inodes start off with i_nlink == 2 (for "." entry) */
43 pr_debug("sysfs: could not get root inode\n");
47 root = d_alloc_root(inode);
49 pr_debug("%s: could not get root dentry!\n",__FUNCTION__);
57 static struct super_block *sysfs_get_sb(struct file_system_type *fs_type,
58 int flags, const char *dev_name, void *data)
60 return get_sb_single(fs_type, flags, data, sysfs_fill_super);
63 static struct file_system_type sysfs_fs_type = {
65 .get_sb = sysfs_get_sb,
66 .kill_sb = kill_litter_super,
69 int __init sysfs_init(void)
73 err = register_filesystem(&sysfs_fs_type);
75 sysfs_mount = kern_mount(&sysfs_fs_type);
76 if (IS_ERR(sysfs_mount)) {
77 printk(KERN_ERR "sysfs: could not mount!\n");
78 err = PTR_ERR(sysfs_mount);