1 /*
2 * mount.c - operations for initializing and mounting sysfs.
3 */
4
5 #define DEBUG
6
7 #include <linux/fs.h>
8 #include <linux/mount.h>
9 #include <linux/pagemap.h>
10 #include <linux/init.h>
11
12 #include "sysfs.h"
13
14 /* Random magic number */
15 #define SYSFS_MAGIC 0x62656572
16
17 struct vfsmount *sysfs_mount;
18 struct super_block * sysfs_sb = NULL;
19 kmem_cache_t *sysfs_dir_cachep;
20
21 static struct super_operations sysfs_ops = {
22 .statfs = simple_statfs,
23 .drop_inode = generic_delete_inode,
24 };
25
26 static struct sysfs_dirent sysfs_root = {
27 .s_sibling = LIST_HEAD_INIT(sysfs_root.s_sibling),
28 .s_children = LIST_HEAD_INIT(sysfs_root.s_children),
29 .s_element = NULL,
30 .s_type = SYSFS_ROOT,
31 };
32
33 static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
34 {
35 struct inode *inode;
36 struct dentry *root;
37
38 sb->s_blocksize = PAGE_CACHE_SIZE;
39 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
40 sb->s_magic = SYSFS_MAGIC;
41 sb->s_op = &sysfs_ops;
42 sb->s_time_gran = 1;
43 sysfs_sb = sb;
44
45 inode = sysfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO);
46 if (inode) {
47 inode->i_op = &sysfs_dir_inode_operations;
48 inode->i_fop = &sysfs_dir_operations;
49 /* directory inodes start off with i_nlink == 2 (for "." entry) */
50 inode->i_nlink++;
51 } else {
52 pr_debug("sysfs: could not get root inode\n");
53 return -ENOMEM;
54 }
55
56 root = d_alloc_root(inode);
57 if (!root) {
58 pr_debug("%s: could not get root dentry!\n",__FUNCTION__);
59 iput(inode);
60 return -ENOMEM;
61 }
62 root->d_fsdata = &sysfs_root;
63 sb->s_root = root;
64 return 0;
65 }
66
67 static struct super_block *sysfs_get_sb(struct file_system_type *fs_type,
68 int flags, const char *dev_name, void *data)
69 {
70 return get_sb_single(fs_type, flags, data, sysfs_fill_super);
71 }
72
73 static struct file_system_type sysfs_fs_type = {
74 .name = "sysfs",
75 .get_sb = sysfs_get_sb,
76 .kill_sb = kill_litter_super,
77 };
78
79 int __init sysfs_init(void)
80 {
81 int err = -ENOMEM;
82
83 sysfs_dir_cachep = kmem_cache_create("sysfs_dir_cache",
84 sizeof(struct sysfs_dirent),
85 0, 0, NULL, NULL);
86 if (!sysfs_dir_cachep)
87 goto out;
88
89 err = register_filesystem(&sysfs_fs_type);
90 if (!err) {
91 sysfs_mount = kern_mount(&sysfs_fs_type);
92 if (IS_ERR(sysfs_mount)) {
93 printk(KERN_ERR "sysfs: could not mount!\n");
94 err = PTR_ERR(sysfs_mount);
95 sysfs_mount = NULL;
96 goto out_err;
97 }
98 } else
99 goto out_err;
100 out:
101 return err;
102 out_err:
103 kmem_cache_destroy(sysfs_dir_cachep);
104 goto out;
105 }
106
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