Contributors: 27
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| David S. Miller |
1090 |
52.86% |
3 |
4.05% |
| Linus Torvalds (pre-git) |
558 |
27.06% |
25 |
33.78% |
| Al Viro |
161 |
7.81% |
15 |
20.27% |
| David Howells |
133 |
6.45% |
3 |
4.05% |
| Rob Herring |
23 |
1.12% |
2 |
2.70% |
| Eric Sandeen |
16 |
0.78% |
1 |
1.35% |
| Art Haas |
10 |
0.48% |
1 |
1.35% |
| Linus Torvalds |
8 |
0.39% |
3 |
4.05% |
| Miklos Szeredi |
8 |
0.39% |
1 |
1.35% |
| Christoph Lameter |
6 |
0.29% |
3 |
4.05% |
| Andi Kleen |
6 |
0.29% |
1 |
1.35% |
| Jeff Johnson |
5 |
0.24% |
1 |
1.35% |
| Eric W. Biedermann |
5 |
0.24% |
1 |
1.35% |
| Christoph Hellwig |
5 |
0.24% |
1 |
1.35% |
| Theodore Y. Ts'o |
4 |
0.19% |
1 |
1.35% |
| Kirill A. Shutemov |
4 |
0.19% |
1 |
1.35% |
| Jeff Garzik |
4 |
0.19% |
1 |
1.35% |
| Song Muchun |
3 |
0.15% |
1 |
1.35% |
| Nicholas Piggin |
3 |
0.15% |
1 |
1.35% |
| Meelis Roos |
2 |
0.10% |
1 |
1.35% |
| Jeff Layton |
2 |
0.10% |
1 |
1.35% |
| Josef 'Jeff' Sipek |
1 |
0.05% |
1 |
1.35% |
| Thomas Gleixner |
1 |
0.05% |
1 |
1.35% |
| Vladimir Davydov |
1 |
0.05% |
1 |
1.35% |
| Jan Engelhardt |
1 |
0.05% |
1 |
1.35% |
| Arjan van de Ven |
1 |
0.05% |
1 |
1.35% |
| Trond Myklebust |
1 |
0.05% |
1 |
1.35% |
| Total |
2062 |
|
74 |
|
// SPDX-License-Identifier: GPL-2.0-only
/* inode.c: /proc/openprom handling routines
*
* Copyright (C) 1996-1999 Jakub Jelinek (jakub@redhat.com)
* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/fs_context.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/magic.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/prom.h>
#include <linux/uaccess.h>
static DEFINE_MUTEX(op_mutex);
#define OPENPROM_ROOT_INO 0
enum op_inode_type {
op_inode_node,
op_inode_prop,
};
union op_inode_data {
struct device_node *node;
struct property *prop;
};
struct op_inode_info {
struct inode vfs_inode;
enum op_inode_type type;
union op_inode_data u;
};
static struct inode *openprom_iget(struct super_block *sb, ino_t ino);
static inline struct op_inode_info *OP_I(struct inode *inode)
{
return container_of(inode, struct op_inode_info, vfs_inode);
}
static int is_string(unsigned char *p, int len)
{
int i;
for (i = 0; i < len; i++) {
unsigned char val = p[i];
if ((i && !val) ||
(val >= ' ' && val <= '~'))
continue;
return 0;
}
return 1;
}
static int property_show(struct seq_file *f, void *v)
{
struct property *prop = f->private;
void *pval;
int len;
len = prop->length;
pval = prop->value;
if (is_string(pval, len)) {
while (len > 0) {
int n = strlen(pval);
seq_printf(f, "%s", (char *) pval);
/* Skip over the NULL byte too. */
pval += n + 1;
len -= n + 1;
if (len > 0)
seq_printf(f, " + ");
}
} else {
if (len & 3) {
while (len) {
len--;
if (len)
seq_printf(f, "%02x.",
*(unsigned char *) pval);
else
seq_printf(f, "%02x",
*(unsigned char *) pval);
pval++;
}
} else {
while (len >= 4) {
len -= 4;
if (len)
seq_printf(f, "%08x.",
*(unsigned int *) pval);
else
seq_printf(f, "%08x",
*(unsigned int *) pval);
pval += 4;
}
}
}
seq_printf(f, "\n");
return 0;
}
static void *property_start(struct seq_file *f, loff_t *pos)
{
if (*pos == 0)
return pos;
return NULL;
}
static void *property_next(struct seq_file *f, void *v, loff_t *pos)
{
(*pos)++;
return NULL;
}
static void property_stop(struct seq_file *f, void *v)
{
/* Nothing to do */
}
static const struct seq_operations property_op = {
.start = property_start,
.next = property_next,
.stop = property_stop,
.show = property_show
};
static int property_open(struct inode *inode, struct file *file)
{
struct op_inode_info *oi = OP_I(inode);
int ret;
BUG_ON(oi->type != op_inode_prop);
ret = seq_open(file, &property_op);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = oi->u.prop;
}
return ret;
}
static const struct file_operations openpromfs_prop_ops = {
.open = property_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int openpromfs_readdir(struct file *, struct dir_context *);
static const struct file_operations openprom_operations = {
.read = generic_read_dir,
.iterate_shared = openpromfs_readdir,
.llseek = generic_file_llseek,
};
static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, unsigned int);
static const struct inode_operations openprom_inode_operations = {
.lookup = openpromfs_lookup,
};
static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
struct op_inode_info *ent_oi, *oi = OP_I(dir);
struct device_node *dp, *child;
struct property *prop;
enum op_inode_type ent_type;
union op_inode_data ent_data;
const char *name;
struct inode *inode;
unsigned int ino;
int len;
BUG_ON(oi->type != op_inode_node);
dp = oi->u.node;
name = dentry->d_name.name;
len = dentry->d_name.len;
mutex_lock(&op_mutex);
child = dp->child;
while (child) {
const char *node_name = kbasename(child->full_name);
int n = strlen(node_name);
if (len == n &&
!strncmp(node_name, name, len)) {
ent_type = op_inode_node;
ent_data.node = child;
ino = child->unique_id;
goto found;
}
child = child->sibling;
}
prop = dp->properties;
while (prop) {
int n = strlen(prop->name);
if (len == n && !strncmp(prop->name, name, len)) {
ent_type = op_inode_prop;
ent_data.prop = prop;
ino = prop->unique_id;
goto found;
}
prop = prop->next;
}
mutex_unlock(&op_mutex);
return ERR_PTR(-ENOENT);
found:
inode = openprom_iget(dir->i_sb, ino);
mutex_unlock(&op_mutex);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (inode->i_state & I_NEW) {
simple_inode_init_ts(inode);
ent_oi = OP_I(inode);
ent_oi->type = ent_type;
ent_oi->u = ent_data;
switch (ent_type) {
case op_inode_node:
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
inode->i_op = &openprom_inode_operations;
inode->i_fop = &openprom_operations;
set_nlink(inode, 2);
break;
case op_inode_prop:
if (of_node_name_eq(dp, "options") && (len == 17) &&
!strncmp (name, "security-password", 17))
inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
else
inode->i_mode = S_IFREG | S_IRUGO;
inode->i_fop = &openpromfs_prop_ops;
set_nlink(inode, 1);
inode->i_size = ent_oi->u.prop->length;
break;
}
unlock_new_inode(inode);
}
return d_splice_alias(inode, dentry);
}
static int openpromfs_readdir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
struct op_inode_info *oi = OP_I(inode);
struct device_node *dp = oi->u.node;
struct device_node *child;
struct property *prop;
int i;
mutex_lock(&op_mutex);
if (ctx->pos == 0) {
if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
goto out;
ctx->pos = 1;
}
if (ctx->pos == 1) {
if (!dir_emit(ctx, "..", 2,
(dp->parent == NULL ?
OPENPROM_ROOT_INO :
dp->parent->unique_id), DT_DIR))
goto out;
ctx->pos = 2;
}
i = ctx->pos - 2;
/* First, the children nodes as directories. */
child = dp->child;
while (i && child) {
child = child->sibling;
i--;
}
while (child) {
if (!dir_emit(ctx,
kbasename(child->full_name),
strlen(kbasename(child->full_name)),
child->unique_id, DT_DIR))
goto out;
ctx->pos++;
child = child->sibling;
}
/* Next, the properties as files. */
prop = dp->properties;
while (i && prop) {
prop = prop->next;
i--;
}
while (prop) {
if (!dir_emit(ctx, prop->name, strlen(prop->name),
prop->unique_id, DT_REG))
goto out;
ctx->pos++;
prop = prop->next;
}
out:
mutex_unlock(&op_mutex);
return 0;
}
static struct kmem_cache *op_inode_cachep;
static struct inode *openprom_alloc_inode(struct super_block *sb)
{
struct op_inode_info *oi;
oi = alloc_inode_sb(sb, op_inode_cachep, GFP_KERNEL);
if (!oi)
return NULL;
return &oi->vfs_inode;
}
static void openprom_free_inode(struct inode *inode)
{
kmem_cache_free(op_inode_cachep, OP_I(inode));
}
static struct inode *openprom_iget(struct super_block *sb, ino_t ino)
{
struct inode *inode = iget_locked(sb, ino);
if (!inode)
inode = ERR_PTR(-ENOMEM);
return inode;
}
static int openpromfs_reconfigure(struct fs_context *fc)
{
sync_filesystem(fc->root->d_sb);
fc->sb_flags |= SB_NOATIME;
return 0;
}
static const struct super_operations openprom_sops = {
.alloc_inode = openprom_alloc_inode,
.free_inode = openprom_free_inode,
.statfs = simple_statfs,
};
static int openprom_fill_super(struct super_block *s, struct fs_context *fc)
{
struct inode *root_inode;
struct op_inode_info *oi;
int ret;
s->s_flags |= SB_NOATIME;
s->s_blocksize = 1024;
s->s_blocksize_bits = 10;
s->s_magic = OPENPROM_SUPER_MAGIC;
s->s_op = &openprom_sops;
s->s_time_gran = 1;
root_inode = openprom_iget(s, OPENPROM_ROOT_INO);
if (IS_ERR(root_inode)) {
ret = PTR_ERR(root_inode);
goto out_no_root;
}
simple_inode_init_ts(root_inode);
root_inode->i_op = &openprom_inode_operations;
root_inode->i_fop = &openprom_operations;
root_inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
oi = OP_I(root_inode);
oi->type = op_inode_node;
oi->u.node = of_find_node_by_path("/");
unlock_new_inode(root_inode);
s->s_root = d_make_root(root_inode);
if (!s->s_root)
goto out_no_root_dentry;
return 0;
out_no_root_dentry:
ret = -ENOMEM;
out_no_root:
printk("openprom_fill_super: get root inode failed\n");
return ret;
}
static int openpromfs_get_tree(struct fs_context *fc)
{
return get_tree_single(fc, openprom_fill_super);
}
static const struct fs_context_operations openpromfs_context_ops = {
.get_tree = openpromfs_get_tree,
.reconfigure = openpromfs_reconfigure,
};
static int openpromfs_init_fs_context(struct fs_context *fc)
{
fc->ops = &openpromfs_context_ops;
return 0;
}
static struct file_system_type openprom_fs_type = {
.owner = THIS_MODULE,
.name = "openpromfs",
.init_fs_context = openpromfs_init_fs_context,
.kill_sb = kill_anon_super,
};
MODULE_ALIAS_FS("openpromfs");
static void op_inode_init_once(void *data)
{
struct op_inode_info *oi = (struct op_inode_info *) data;
inode_init_once(&oi->vfs_inode);
}
static int __init init_openprom_fs(void)
{
int err;
op_inode_cachep = kmem_cache_create("op_inode_cache",
sizeof(struct op_inode_info),
0,
(SLAB_RECLAIM_ACCOUNT |
SLAB_ACCOUNT),
op_inode_init_once);
if (!op_inode_cachep)
return -ENOMEM;
err = register_filesystem(&openprom_fs_type);
if (err)
kmem_cache_destroy(op_inode_cachep);
return err;
}
static void __exit exit_openprom_fs(void)
{
unregister_filesystem(&openprom_fs_type);
/*
* Make sure all delayed rcu free inodes are flushed before we
* destroy cache.
*/
rcu_barrier();
kmem_cache_destroy(op_inode_cachep);
}
module_init(init_openprom_fs)
module_exit(exit_openprom_fs)
MODULE_DESCRIPTION("OpenPROM filesystem support");
MODULE_LICENSE("GPL");