fs/openpromfs/inode.c - kernel/msm-5.4 - Gitiles

 /* 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/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 <asm/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 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 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 *, void *, filldir_t);

 static const struct file_operations openprom_operations = {
 	.read		= generic_read_dir,
 	.readdir	= openpromfs_readdir,
 };

 static struct dentry *openpromfs_lookup(struct inode *, struct dentry *, struct nameidata *);

 static const struct inode_operations openprom_inode_operations = {
 	.lookup		= openpromfs_lookup,
 };

 static struct dentry *openpromfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 {
 	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) {
 		int n = strlen(child->path_component_name);

 		if (len == n &&
 		    !strncmp(child->path_component_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 = iget(dir->i_sb, ino);
 	mutex_unlock(&op_mutex);
 	if (!inode)
 		return ERR_PTR(-EINVAL);
 	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;
 		inode->i_nlink = 2;
 		break;
 	case op_inode_prop:
 		if (!strcmp(dp->name, "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;
 		inode->i_nlink = 1;
 		inode->i_size = ent_oi->u.prop->length;
 		break;
 	}

 	inode->i_gid = 0;
 	inode->i_uid = 0;

 	d_add(dentry, inode);
 	return NULL;
 }

 static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 {
 	struct inode *inode = filp->f_path.dentry->d_inode;
 	struct op_inode_info *oi = OP_I(inode);
 	struct device_node *dp = oi->u.node;
 	struct device_node *child;
 	struct property *prop;
 	unsigned int ino;
 	int i;

 	mutex_lock(&op_mutex);

 	ino = inode->i_ino;
 	i = filp->f_pos;
 	switch (i) {
 	case 0:
 		if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
 			goto out;
 		i++;
 		filp->f_pos++;
 		/* fall thru */
 	case 1:
 		if (filldir(dirent, "..", 2, i,
 			    (dp->parent == NULL ?
 			     OPENPROM_ROOT_INO :
 			     dp->parent->unique_id), DT_DIR) < 0)
 			goto out;
 		i++;
 		filp->f_pos++;
 		/* fall thru */
 	default:
 		i -= 2;

 		/* First, the children nodes as directories.  */
 		child = dp->child;
 		while (i && child) {
 			child = child->sibling;
 			i--;
 		}
 		while (child) {
 			if (filldir(dirent,
 				    child->path_component_name,
 				    strlen(child->path_component_name),
 				    filp->f_pos, child->unique_id, DT_DIR) < 0)
 				goto out;

 			filp->f_pos++;
 			child = child->sibling;
 		}

 		/* Next, the properties as files.  */
 		prop = dp->properties;
 		while (i && prop) {
 			prop = prop->next;
 			i--;
 		}
 		while (prop) {
 			if (filldir(dirent, prop->name, strlen(prop->name),
 				    filp->f_pos, prop->unique_id, DT_REG) < 0)
 				goto out;

 			filp->f_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 = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL);
 	if (!oi)
 		return NULL;

 	return &oi->vfs_inode;
 }

 static void openprom_destroy_inode(struct inode *inode)
 {
 	kmem_cache_free(op_inode_cachep, OP_I(inode));
 }

 static void openprom_read_inode(struct inode * inode)
 {
 	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 	if (inode->i_ino == OPENPROM_ROOT_INO) {
 		inode->i_op = &openprom_inode_operations;
 		inode->i_fop = &openprom_operations;
 		inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
 	}
 }

 static int openprom_remount(struct super_block *sb, int *flags, char *data)
 {
 	*flags |= MS_NOATIME;
 	return 0;
 }

 static const struct super_operations openprom_sops = {
 	.alloc_inode	= openprom_alloc_inode,
 	.destroy_inode	= openprom_destroy_inode,
 	.read_inode	= openprom_read_inode,
 	.statfs		= simple_statfs,
 	.remount_fs	= openprom_remount,
 };

 static int openprom_fill_super(struct super_block *s, void *data, int silent)
 {
 	struct inode *root_inode;
 	struct op_inode_info *oi;

 	s->s_flags |= MS_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 = iget(s, OPENPROM_ROOT_INO);
 	if (!root_inode)
 		goto out_no_root;

 	oi = OP_I(root_inode);
 	oi->type = op_inode_node;
 	oi->u.node = of_find_node_by_path("/");

 	s->s_root = d_alloc_root(root_inode);
 	if (!s->s_root)
 		goto out_no_root;
 	return 0;

 out_no_root:
 	printk("openprom_fill_super: get root inode failed\n");
 	iput(root_inode);
 	return -ENOMEM;
 }

 static int openprom_get_sb(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
 	return get_sb_single(fs_type, flags, data, openprom_fill_super, mnt);
 }

 static struct file_system_type openprom_fs_type = {
 	.owner		= THIS_MODULE,
 	.name		= "openpromfs",
 	.get_sb		= openprom_get_sb,
 	.kill_sb	= kill_anon_super,
 };

 static void op_inode_init_once(void *data, struct kmem_cache * cachep, unsigned long flags)
 {
 	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_MEM_SPREAD),
 					    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);
 	kmem_cache_destroy(op_inode_cachep);
 }

 module_init(init_openprom_fs)
 module_exit(exit_openprom_fs)
 MODULE_LICENSE("GPL");
	/* 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/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 <asm/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 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 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 , void , filldir_t);

	static const struct file_operations openprom_operations = {
	.read = generic_read_dir,
	.readdir = openpromfs_readdir,
	};

	static struct dentry openpromfs_lookup(struct inode , struct dentry , struct nameidata );

	static const struct inode_operations openprom_inode_operations = {
	.lookup = openpromfs_lookup,
	};

	static struct dentry openpromfs_lookup(struct inode dir, struct dentry dentry, struct nameidata nd)
	{
	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) {
	int n = strlen(child->path_component_name);

	if (len == n &&
	!strncmp(child->path_component_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 = iget(dir->i_sb, ino);
	mutex_unlock(&op_mutex);
	if (!inode)
	return ERR_PTR(-EINVAL);
	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;
	inode->i_nlink = 2;
	break;
	case op_inode_prop:
	if (!strcmp(dp->name, "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;
	inode->i_nlink = 1;
	inode->i_size = ent_oi->u.prop->length;
	break;
	}

	inode->i_gid = 0;
	inode->i_uid = 0;

	d_add(dentry, inode);
	return NULL;
	}

	static int openpromfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
	{
	struct inode *inode = filp->f_path.dentry->d_inode;
	struct op_inode_info *oi = OP_I(inode);
	struct device_node *dp = oi->u.node;
	struct device_node *child;
	struct property *prop;
	unsigned int ino;
	int i;

	mutex_lock(&op_mutex);

	ino = inode->i_ino;
	i = filp->f_pos;
	switch (i) {
	case 0:
	if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
	goto out;
	i++;
	filp->f_pos++;
	/* fall thru */
	case 1:
	if (filldir(dirent, "..", 2, i,
	(dp->parent == NULL ?
	OPENPROM_ROOT_INO :
	dp->parent->unique_id), DT_DIR) < 0)
	goto out;
	i++;
	filp->f_pos++;
	/* fall thru */
	default:
	i -= 2;

	/* First, the children nodes as directories. */
	child = dp->child;
	while (i && child) {
	child = child->sibling;
	i--;
	}
	while (child) {
	if (filldir(dirent,
	child->path_component_name,
	strlen(child->path_component_name),
	filp->f_pos, child->unique_id, DT_DIR) < 0)
	goto out;

	filp->f_pos++;
	child = child->sibling;
	}

	/* Next, the properties as files. */
	prop = dp->properties;
	while (i && prop) {
	prop = prop->next;
	i--;
	}
	while (prop) {
	if (filldir(dirent, prop->name, strlen(prop->name),
	filp->f_pos, prop->unique_id, DT_REG) < 0)
	goto out;

	filp->f_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 = kmem_cache_alloc(op_inode_cachep, GFP_KERNEL);
	if (!oi)
	return NULL;

	return &oi->vfs_inode;
	}

	static void openprom_destroy_inode(struct inode *inode)
	{
	kmem_cache_free(op_inode_cachep, OP_I(inode));
	}

	static void openprom_read_inode(struct inode * inode)
	{
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	if (inode->i_ino == OPENPROM_ROOT_INO) {
	inode->i_op = &openprom_inode_operations;
	inode->i_fop = &openprom_operations;
	inode->i_mode = S_IFDIR \| S_IRUGO \| S_IXUGO;
	}
	}

	static int openprom_remount(struct super_block sb, int flags, char *data)
	{
	*flags \|= MS_NOATIME;
	return 0;
	}

	static const struct super_operations openprom_sops = {
	.alloc_inode = openprom_alloc_inode,
	.destroy_inode = openprom_destroy_inode,
	.read_inode = openprom_read_inode,
	.statfs = simple_statfs,
	.remount_fs = openprom_remount,
	};

	static int openprom_fill_super(struct super_block s, void data, int silent)
	{
	struct inode *root_inode;
	struct op_inode_info *oi;

	s->s_flags \|= MS_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 = iget(s, OPENPROM_ROOT_INO);
	if (!root_inode)
	goto out_no_root;

	oi = OP_I(root_inode);
	oi->type = op_inode_node;
	oi->u.node = of_find_node_by_path("/");

	s->s_root = d_alloc_root(root_inode);
	if (!s->s_root)
	goto out_no_root;
	return 0;

	out_no_root:
	printk("openprom_fill_super: get root inode failed\n");
	iput(root_inode);
	return -ENOMEM;
	}

	static int openprom_get_sb(struct file_system_type *fs_type,
	int flags, const char dev_name, void data, struct vfsmount *mnt)
	{
	return get_sb_single(fs_type, flags, data, openprom_fill_super, mnt);
	}

	static struct file_system_type openprom_fs_type = {
	.owner = THIS_MODULE,
	.name = "openpromfs",
	.get_sb = openprom_get_sb,
	.kill_sb = kill_anon_super,
	};

	static void op_inode_init_once(void data, struct kmem_cache cachep, unsigned long flags)
	{
	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_MEM_SPREAD),
	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);
	kmem_cache_destroy(op_inode_cachep);
	}

	module_init(init_openprom_fs)
	module_exit(exit_openprom_fs)
	MODULE_LICENSE("GPL");