[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / proc / inode.c

/*
 *  linux/fs/proc/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/completion.h>
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/limits.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/smp_lock.h>

#include <asm/system.h>
#include <asm/uaccess.h>

#include "internal.h"

struct proc_dir_entry *de_get(struct proc_dir_entry *de)
{
	if (de)
		atomic_inc(&de->count);
	return de;
}

/*
 * Decrements the use count and checks for deferred deletion.
 */
void de_put(struct proc_dir_entry *de)
{
	if (de) {	
		lock_kernel();		
		if (!atomic_read(&de->count)) {
			printk("de_put: entry %s already free!\n", de->name);
			unlock_kernel();
			return;
		}

		if (atomic_dec_and_test(&de->count))
			free_proc_entry(de);
		unlock_kernel();
	}
}

/*
 * Decrement the use count of the proc_dir_entry.
 */
static void proc_delete_inode(struct inode *inode)
{
	struct proc_dir_entry *de;

	truncate_inode_pages(&inode->i_data, 0);

	/* Stop tracking associated processes */
	put_pid(PROC_I(inode)->pid);

	/* Let go of any associated proc directory entry */
	de = PROC_I(inode)->pde;
	if (de) {
		if (de->owner)
			module_put(de->owner);
		de_put(de);
	}
	clear_inode(inode);
}

struct vfsmount *proc_mnt;

static struct kmem_cache * proc_inode_cachep;

static struct inode *proc_alloc_inode(struct super_block *sb)
{
	struct proc_inode *ei;
	struct inode *inode;

	ei = (struct proc_inode *)kmem_cache_alloc(proc_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	ei->pid = NULL;
	ei->fd = 0;
	ei->op.proc_get_link = NULL;
	ei->pde = NULL;
	inode = &ei->vfs_inode;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	return inode;
}

static void proc_destroy_inode(struct inode *inode)
{
	kmem_cache_free(proc_inode_cachep, PROC_I(inode));
}

static void init_once(struct kmem_cache * cachep, void *foo)
{
	struct proc_inode *ei = (struct proc_inode *) foo;

	inode_init_once(&ei->vfs_inode);
}

int __init proc_init_inodecache(void)
{
	proc_inode_cachep = kmem_cache_create("proc_inode_cache",
					     sizeof(struct proc_inode),
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD|SLAB_PANIC),
					     init_once);
	return 0;
}

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

static const struct super_operations proc_sops = {
	.alloc_inode	= proc_alloc_inode,
	.destroy_inode	= proc_destroy_inode,
	.drop_inode	= generic_delete_inode,
	.delete_inode	= proc_delete_inode,
	.statfs		= simple_statfs,
	.remount_fs	= proc_remount,
};

static void pde_users_dec(struct proc_dir_entry *pde)
{
	spin_lock(&pde->pde_unload_lock);
	pde->pde_users--;
	if (pde->pde_unload_completion && pde->pde_users == 0)
		complete(pde->pde_unload_completion);
	spin_unlock(&pde->pde_unload_lock);
}

static loff_t proc_reg_llseek(struct file *file, loff_t offset, int whence)
{
	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	loff_t rv = -EINVAL;
	loff_t (*llseek)(struct file *, loff_t, int);

	spin_lock(&pde->pde_unload_lock);
	/*
	 * remove_proc_entry() is going to delete PDE (as part of module
	 * cleanup sequence). No new callers into module allowed.
	 */
	if (!pde->proc_fops) {
		spin_unlock(&pde->pde_unload_lock);
		return rv;
	}
	/*
	 * Bump refcount so that remove_proc_entry will wail for ->llseek to
	 * complete.
	 */
	pde->pde_users++;
	/*
	 * Save function pointer under lock, to protect against ->proc_fops
	 * NULL'ifying right after ->pde_unload_lock is dropped.
	 */
	llseek = pde->proc_fops->llseek;
	spin_unlock(&pde->pde_unload_lock);

	if (!llseek)
		llseek = default_llseek;
	rv = llseek(file, offset, whence);

	pde_users_dec(pde);
	return rv;
}

static ssize_t proc_reg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	ssize_t rv = -EIO;
	ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);

	spin_lock(&pde->pde_unload_lock);
	if (!pde->proc_fops) {
		spin_unlock(&pde->pde_unload_lock);
		return rv;
	}
	pde->pde_users++;
	read = pde->proc_fops->read;
	spin_unlock(&pde->pde_unload_lock);

	if (read)
		rv = read(file, buf, count, ppos);

	pde_users_dec(pde);
	return rv;
}

static ssize_t proc_reg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	ssize_t rv = -EIO;
	ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);

	spin_lock(&pde->pde_unload_lock);
	if (!pde->proc_fops) {
		spin_unlock(&pde->pde_unload_lock);
		return rv;
	}
	pde->pde_users++;
	write = pde->proc_fops->write;
	spin_unlock(&pde->pde_unload_lock);

	if (write)
		rv = write(file, buf, count, ppos);

	pde_users_dec(pde);
	return rv;
}

static unsigned int proc_reg_poll(struct file *file, struct poll_table_struct *pts)
{
	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	unsigned int rv = DEFAULT_POLLMASK;
	unsigned int (*poll)(struct file *, struct poll_table_struct *);

	spin_lock(&pde->pde_unload_lock);
	if (!pde->proc_fops) {
		spin_unlock(&pde->pde_unload_lock);
		return rv;
	}
	pde->pde_users++;
	poll = pde->proc_fops->poll;
	spin_unlock(&pde->pde_unload_lock);

	if (poll)
		rv = poll(file, pts);

	pde_users_dec(pde);
	return rv;
}

static long proc_reg_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	long rv = -ENOTTY;
	long (*unlocked_ioctl)(struct file *, unsigned int, unsigned long);
	int (*ioctl)(struct inode *, struct file *, unsigned int, unsigned long);

	spin_lock(&pde->pde_unload_lock);
	if (!pde->proc_fops) {
		spin_unlock(&pde->pde_unload_lock);
		return rv;
	}
	pde->pde_users++;
	unlocked_ioctl = pde->proc_fops->unlocked_ioctl;
	ioctl = pde->proc_fops->ioctl;
	spin_unlock(&pde->pde_unload_lock);

	if (unlocked_ioctl) {
		rv = unlocked_ioctl(file, cmd, arg);
		if (rv == -ENOIOCTLCMD)
			rv = -EINVAL;
	} else if (ioctl) {
		lock_kernel();
		rv = ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
		unlock_kernel();
	}

	pde_users_dec(pde);
	return rv;
}

#ifdef CONFIG_COMPAT
static long proc_reg_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	long rv = -ENOTTY;
	long (*compat_ioctl)(struct file *, unsigned int, unsigned long);

	spin_lock(&pde->pde_unload_lock);
	if (!pde->proc_fops) {
		spin_unlock(&pde->pde_unload_lock);
		return rv;
	}
	pde->pde_users++;
	compat_ioctl = pde->proc_fops->compat_ioctl;
	spin_unlock(&pde->pde_unload_lock);

	if (compat_ioctl)
		rv = compat_ioctl(file, cmd, arg);

	pde_users_dec(pde);
	return rv;
}
#endif

static int proc_reg_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	int rv = -EIO;
	int (*mmap)(struct file *, struct vm_area_struct *);

	spin_lock(&pde->pde_unload_lock);
	if (!pde->proc_fops) {
		spin_unlock(&pde->pde_unload_lock);
		return rv;
	}
	pde->pde_users++;
	mmap = pde->proc_fops->mmap;
	spin_unlock(&pde->pde_unload_lock);

	if (mmap)
		rv = mmap(file, vma);

	pde_users_dec(pde);
	return rv;
}

static int proc_reg_open(struct inode *inode, struct file *file)
{
	struct proc_dir_entry *pde = PDE(inode);
	int rv = 0;
	int (*open)(struct inode *, struct file *);

	spin_lock(&pde->pde_unload_lock);
	if (!pde->proc_fops) {
		spin_unlock(&pde->pde_unload_lock);
		return rv;
	}
	pde->pde_users++;
	open = pde->proc_fops->open;
	spin_unlock(&pde->pde_unload_lock);

	if (open)
		rv = open(inode, file);

	pde_users_dec(pde);
	return rv;
}

static int proc_reg_release(struct inode *inode, struct file *file)
{
	struct proc_dir_entry *pde = PDE(inode);
	int rv = 0;
	int (*release)(struct inode *, struct file *);

	spin_lock(&pde->pde_unload_lock);
	if (!pde->proc_fops) {
		spin_unlock(&pde->pde_unload_lock);
		return rv;
	}
	pde->pde_users++;
	release = pde->proc_fops->release;
	spin_unlock(&pde->pde_unload_lock);

	if (release)
		rv = release(inode, file);

	pde_users_dec(pde);
	return rv;
}

static const struct file_operations proc_reg_file_ops = {
	.llseek		= proc_reg_llseek,
	.read		= proc_reg_read,
	.write		= proc_reg_write,
	.poll		= proc_reg_poll,
	.unlocked_ioctl	= proc_reg_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= proc_reg_compat_ioctl,
#endif
	.mmap		= proc_reg_mmap,
	.open		= proc_reg_open,
	.release	= proc_reg_release,
};

#ifdef CONFIG_COMPAT
static const struct file_operations proc_reg_file_ops_no_compat = {
	.llseek		= proc_reg_llseek,
	.read		= proc_reg_read,
	.write		= proc_reg_write,
	.poll		= proc_reg_poll,
	.unlocked_ioctl	= proc_reg_unlocked_ioctl,
	.mmap		= proc_reg_mmap,
	.open		= proc_reg_open,
	.release	= proc_reg_release,
};
#endif

struct inode *proc_get_inode(struct super_block *sb, unsigned int ino,
				struct proc_dir_entry *de)
{
	struct inode * inode;

	if (de != NULL && !try_module_get(de->owner))
		goto out_mod;

	inode = iget_locked(sb, ino);
	if (!inode)
		goto out_ino;
	if (inode->i_state & I_NEW) {
		inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
		PROC_I(inode)->fd = 0;
		PROC_I(inode)->pde = de;
		if (de) {
			if (de->mode) {
				inode->i_mode = de->mode;
				inode->i_uid = de->uid;
				inode->i_gid = de->gid;
			}
			if (de->size)
				inode->i_size = de->size;
			if (de->nlink)
				inode->i_nlink = de->nlink;
			if (de->proc_iops)
				inode->i_op = de->proc_iops;
			if (de->proc_fops) {
				if (S_ISREG(inode->i_mode)) {
#ifdef CONFIG_COMPAT
					if (!de->proc_fops->compat_ioctl)
						inode->i_fop =
							&proc_reg_file_ops_no_compat;
					else
#endif
						inode->i_fop = &proc_reg_file_ops;
				} else {
					inode->i_fop = de->proc_fops;
				}
			}
		}
		unlock_new_inode(inode);
	}
	return inode;

out_ino:
	if (de != NULL)
		module_put(de->owner);
out_mod:
	return NULL;
}			

int proc_fill_super(struct super_block *s)
{
	struct inode * root_inode;

	s->s_flags |= MS_NODIRATIME | MS_NOSUID | MS_NOEXEC;
	s->s_blocksize = 1024;
	s->s_blocksize_bits = 10;
	s->s_magic = PROC_SUPER_MAGIC;
	s->s_op = &proc_sops;
	s->s_time_gran = 1;
	
	de_get(&proc_root);
	root_inode = proc_get_inode(s, PROC_ROOT_INO, &proc_root);
	if (!root_inode)
		goto out_no_root;
	root_inode->i_uid = 0;
	root_inode->i_gid = 0;
	s->s_root = d_alloc_root(root_inode);
	if (!s->s_root)
		goto out_no_root;
	return 0;

out_no_root:
	printk("proc_read_super: get root inode failed\n");
	iput(root_inode);
	de_put(&proc_root);
	return -ENOMEM;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/proc/inode.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
	7	#include <linux/time.h>
	8	#include <linux/proc_fs.h>
	9	#include <linux/kernel.h>
	10	#include <linux/mm.h>
	11	#include <linux/string.h>
	12	#include <linux/stat.h>
786d7e16	13	#include <linux/completion.h>
dd23aae4	14	#include <linux/poll.h>
1da177e4 LT	15	#include <linux/file.h>
	16	#include <linux/limits.h>
	17	#include <linux/init.h>
	18	#include <linux/module.h>
	19	#include <linux/smp_lock.h>
	20
	21	#include <asm/system.h>
	22	#include <asm/uaccess.h>
	23
fee781e6	24	#include "internal.h"
1da177e4	25
7695650a	26	struct proc_dir_entry de_get(struct proc_dir_entry de)
1da177e4 LT	27	{
	28	if (de)
	29	atomic_inc(&de->count);
	30	return de;
	31	}
	32
	33	/*
	34	* Decrements the use count and checks for deferred deletion.
	35	*/
7695650a	36	void de_put(struct proc_dir_entry *de)
1da177e4 LT	37	{
	38	if (de) {
	39	lock_kernel();
	40	if (!atomic_read(&de->count)) {
	41	printk("de_put: entry %s already free!\n", de->name);
	42	unlock_kernel();
	43	return;
	44	}
	45
5a622f2d AD	46	if (atomic_dec_and_test(&de->count))
5a622f2d AD	47	free_proc_entry(de);
1da177e4 LT	48	unlock_kernel();
	49	}
	50	}
	51
	52	/*
	53	* Decrement the use count of the proc_dir_entry.
	54	*/
	55	static void proc_delete_inode(struct inode *inode)
	56	{
	57	struct proc_dir_entry *de;
1da177e4	58
fef26658 MF	59	truncate_inode_pages(&inode->i_data, 0);
fef26658 MF	60
99f89551	61	/* Stop tracking associated processes */
13b41b09	62	put_pid(PROC_I(inode)->pid);
1da177e4 LT	63
	64	/* Let go of any associated proc directory entry */
	65	de = PROC_I(inode)->pde;
	66	if (de) {
	67	if (de->owner)
	68	module_put(de->owner);
	69	de_put(de);
	70	}
	71	clear_inode(inode);
	72	}
	73
	74	struct vfsmount *proc_mnt;
	75
e18b890b	76	static struct kmem_cache * proc_inode_cachep;
1da177e4 LT	77
	78	static struct inode proc_alloc_inode(struct super_block sb)
	79	{
	80	struct proc_inode *ei;
	81	struct inode *inode;
	82
e94b1766	83	ei = (struct proc_inode *)kmem_cache_alloc(proc_inode_cachep, GFP_KERNEL);
1da177e4 LT	84	if (!ei)
1da177e4 LT	85	return NULL;
13b41b09	86	ei->pid = NULL;
aed7a6c4	87	ei->fd = 0;
1da177e4 LT	88	ei->op.proc_get_link = NULL;
	89	ei->pde = NULL;
	90	inode = &ei->vfs_inode;
	91	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	92	return inode;
	93	}
	94
	95	static void proc_destroy_inode(struct inode *inode)
	96	{
	97	kmem_cache_free(proc_inode_cachep, PROC_I(inode));
	98	}
	99
4ba9b9d0	100	static void init_once(struct kmem_cache * cachep, void *foo)
1da177e4 LT	101	{
	102	struct proc_inode ei = (struct proc_inode ) foo;
	103
a35afb83	104	inode_init_once(&ei->vfs_inode);
1da177e4	105	}
20c2df83	106
1da177e4 LT	107	int __init proc_init_inodecache(void)
	108	{
	109	proc_inode_cachep = kmem_cache_create("proc_inode_cache",
	110	sizeof(struct proc_inode),
fffb60f9	111	0, (SLAB_RECLAIM_ACCOUNT\|
040b5c6f	112	SLAB_MEM_SPREAD\|SLAB_PANIC),
20c2df83	113	init_once);
1da177e4 LT	114	return 0;
	115	}
	116
	117	static int proc_remount(struct super_block sb, int flags, char *data)
	118	{
	119	*flags \|= MS_NODIRATIME;
	120	return 0;
	121	}
	122
ee9b6d61	123	static const struct super_operations proc_sops = {
1da177e4 LT	124	.alloc_inode = proc_alloc_inode,
1da177e4 LT	125	.destroy_inode = proc_destroy_inode,
1da177e4 LT	126	.drop_inode = generic_delete_inode,
	127	.delete_inode = proc_delete_inode,
	128	.statfs = simple_statfs,
	129	.remount_fs = proc_remount,
	130	};
	131
786d7e16 AD	132	static void pde_users_dec(struct proc_dir_entry *pde)
	133	{
	134	spin_lock(&pde->pde_unload_lock);
	135	pde->pde_users--;
	136	if (pde->pde_unload_completion && pde->pde_users == 0)
	137	complete(pde->pde_unload_completion);
	138	spin_unlock(&pde->pde_unload_lock);
	139	}
	140
	141	static loff_t proc_reg_llseek(struct file *file, loff_t offset, int whence)
	142	{
	143	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	144	loff_t rv = -EINVAL;
	145	loff_t (llseek)(struct file , loff_t, int);
	146
	147	spin_lock(&pde->pde_unload_lock);
	148	/*
	149	* remove_proc_entry() is going to delete PDE (as part of module
	150	* cleanup sequence). No new callers into module allowed.
	151	*/
	152	if (!pde->proc_fops) {
	153	spin_unlock(&pde->pde_unload_lock);
	154	return rv;
	155	}
	156	/*
	157	* Bump refcount so that remove_proc_entry will wail for ->llseek to
	158	* complete.
	159	*/
	160	pde->pde_users++;
	161	/*
	162	* Save function pointer under lock, to protect against ->proc_fops
	163	* NULL'ifying right after ->pde_unload_lock is dropped.
	164	*/
	165	llseek = pde->proc_fops->llseek;
	166	spin_unlock(&pde->pde_unload_lock);
	167
	168	if (!llseek)
	169	llseek = default_llseek;
	170	rv = llseek(file, offset, whence);
	171
	172	pde_users_dec(pde);
	173	return rv;
	174	}
	175
	176	static ssize_t proc_reg_read(struct file file, char __user buf, size_t count, loff_t *ppos)
	177	{
	178	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	179	ssize_t rv = -EIO;
	180	ssize_t (read)(struct file , char __user , size_t, loff_t );
	181
	182	spin_lock(&pde->pde_unload_lock);
	183	if (!pde->proc_fops) {
	184	spin_unlock(&pde->pde_unload_lock);
	185	return rv;
	186	}
	187	pde->pde_users++;
	188	read = pde->proc_fops->read;
	189	spin_unlock(&pde->pde_unload_lock);
	190
	191	if (read)
	192	rv = read(file, buf, count, ppos);
	193
	194	pde_users_dec(pde);
	195	return rv;
196	}
197
198	static ssize_t proc_reg_write(struct file file, const char __user buf, size_t count, loff_t *ppos)
199	{
200	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
201	ssize_t rv = -EIO;
202	ssize_t (write)(struct file , const char __user , size_t, loff_t );
203
204	spin_lock(&pde->pde_unload_lock);
205	if (!pde->proc_fops) {
206	spin_unlock(&pde->pde_unload_lock);
207	return rv;
208	}
209	pde->pde_users++;
210	write = pde->proc_fops->write;
211	spin_unlock(&pde->pde_unload_lock);
212
213	if (write)
214	rv = write(file, buf, count, ppos);
215
216	pde_users_dec(pde);
217	return rv;
218	}
219
220	static unsigned int proc_reg_poll(struct file file, struct poll_table_struct pts)
221	{
222	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
dd23aae4	223	unsigned int rv = DEFAULT_POLLMASK;
786d7e16 AD	224	unsigned int (poll)(struct file , struct poll_table_struct *);
	225
	226	spin_lock(&pde->pde_unload_lock);
	227	if (!pde->proc_fops) {
	228	spin_unlock(&pde->pde_unload_lock);
	229	return rv;
	230	}
	231	pde->pde_users++;
	232	poll = pde->proc_fops->poll;
	233	spin_unlock(&pde->pde_unload_lock);
	234
	235	if (poll)
	236	rv = poll(file, pts);
	237
	238	pde_users_dec(pde);
	239	return rv;
	240	}
	241
	242	static long proc_reg_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	243	{
	244	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	245	long rv = -ENOTTY;
	246	long (unlocked_ioctl)(struct file , unsigned int, unsigned long);
	247	int (ioctl)(struct inode , struct file *, unsigned int, unsigned long);
	248
	249	spin_lock(&pde->pde_unload_lock);
	250	if (!pde->proc_fops) {
	251	spin_unlock(&pde->pde_unload_lock);
	252	return rv;
	253	}
	254	pde->pde_users++;
	255	unlocked_ioctl = pde->proc_fops->unlocked_ioctl;
	256	ioctl = pde->proc_fops->ioctl;
	257	spin_unlock(&pde->pde_unload_lock);
	258
	259	if (unlocked_ioctl) {
	260	rv = unlocked_ioctl(file, cmd, arg);
	261	if (rv == -ENOIOCTLCMD)
	262	rv = -EINVAL;
	263	} else if (ioctl) {
	264	lock_kernel();
	265	rv = ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
	266	unlock_kernel();
	267	}
	268
	269	pde_users_dec(pde);
	270	return rv;
	271	}
	272
	273	#ifdef CONFIG_COMPAT
	274	static long proc_reg_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	275	{
	276	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	277	long rv = -ENOTTY;
	278	long (compat_ioctl)(struct file , unsigned int, unsigned long);
	279
	280	spin_lock(&pde->pde_unload_lock);
	281	if (!pde->proc_fops) {
	282	spin_unlock(&pde->pde_unload_lock);
	283	return rv;
	284	}
	285	pde->pde_users++;
	286	compat_ioctl = pde->proc_fops->compat_ioctl;
	287	spin_unlock(&pde->pde_unload_lock);
288
289	if (compat_ioctl)
290	rv = compat_ioctl(file, cmd, arg);
291
292	pde_users_dec(pde);
293	return rv;
294	}
295	#endif
296
297	static int proc_reg_mmap(struct file file, struct vm_area_struct vma)
298	{
299	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
300	int rv = -EIO;
301	int (mmap)(struct file , struct vm_area_struct *);
302
303	spin_lock(&pde->pde_unload_lock);
304	if (!pde->proc_fops) {
305	spin_unlock(&pde->pde_unload_lock);
306	return rv;
307	}
308	pde->pde_users++;
309	mmap = pde->proc_fops->mmap;
310	spin_unlock(&pde->pde_unload_lock);
311
312	if (mmap)
313	rv = mmap(file, vma);
314
315	pde_users_dec(pde);
316	return rv;
317	}
318
319	static int proc_reg_open(struct inode inode, struct file file)
320	{
321	struct proc_dir_entry *pde = PDE(inode);
322	int rv = 0;
323	int (open)(struct inode , struct file *);
324
325	spin_lock(&pde->pde_unload_lock);
326	if (!pde->proc_fops) {
327	spin_unlock(&pde->pde_unload_lock);
328	return rv;
329	}
330	pde->pde_users++;
331	open = pde->proc_fops->open;
332	spin_unlock(&pde->pde_unload_lock);
333
334	if (open)
335	rv = open(inode, file);
336
337	pde_users_dec(pde);
338	return rv;
339	}
340
341	static int proc_reg_release(struct inode inode, struct file file)
342	{
343	struct proc_dir_entry *pde = PDE(inode);
344	int rv = 0;
345	int (release)(struct inode , struct file *);
346
347	spin_lock(&pde->pde_unload_lock);
348	if (!pde->proc_fops) {
349	spin_unlock(&pde->pde_unload_lock);
350	return rv;
351	}
352	pde->pde_users++;
353	release = pde->proc_fops->release;
354	spin_unlock(&pde->pde_unload_lock);
355
356	if (release)
357	rv = release(inode, file);
358
359	pde_users_dec(pde);
360	return rv;
361	}
362
363	static const struct file_operations proc_reg_file_ops = {
364	.llseek = proc_reg_llseek,
365	.read = proc_reg_read,
366	.write = proc_reg_write,
367	.poll = proc_reg_poll,
368	.unlocked_ioctl = proc_reg_unlocked_ioctl,
369	#ifdef CONFIG_COMPAT
370	.compat_ioctl = proc_reg_compat_ioctl,
371	#endif
372	.mmap = proc_reg_mmap,
373	.open = proc_reg_open,
374	.release = proc_reg_release,
375	};
376
778f3dd5 DM	377	#ifdef CONFIG_COMPAT
	378	static const struct file_operations proc_reg_file_ops_no_compat = {
	379	.llseek = proc_reg_llseek,
	380	.read = proc_reg_read,
	381	.write = proc_reg_write,
	382	.poll = proc_reg_poll,
	383	.unlocked_ioctl = proc_reg_unlocked_ioctl,
	384	.mmap = proc_reg_mmap,
	385	.open = proc_reg_open,
	386	.release = proc_reg_release,
	387	};
	388	#endif
	389
1da177e4 LT	390	struct inode proc_get_inode(struct super_block sb, unsigned int ino,
	391	struct proc_dir_entry *de)
	392	{
	393	struct inode * inode;
	394
e9543659 KK	395	if (de != NULL && !try_module_get(de->owner))
	396	goto out_mod;
	397
a1d4aebb	398	inode = iget_locked(sb, ino);
1da177e4	399	if (!inode)
e9543659	400	goto out_ino;
a1d4aebb DH	401	if (inode->i_state & I_NEW) {
	402	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	403	PROC_I(inode)->fd = 0;
	404	PROC_I(inode)->pde = de;
	405	if (de) {
	406	if (de->mode) {
	407	inode->i_mode = de->mode;
	408	inode->i_uid = de->uid;
	409	inode->i_gid = de->gid;
	410	}
	411	if (de->size)
	412	inode->i_size = de->size;
	413	if (de->nlink)
	414	inode->i_nlink = de->nlink;
	415	if (de->proc_iops)
	416	inode->i_op = de->proc_iops;
	417	if (de->proc_fops) {
	418	if (S_ISREG(inode->i_mode)) {
778f3dd5	419	#ifdef CONFIG_COMPAT
a1d4aebb DH	420	if (!de->proc_fops->compat_ioctl)
	421	inode->i_fop =
	422	&proc_reg_file_ops_no_compat;
	423	else
778f3dd5	424	#endif
a1d4aebb DH	425	inode->i_fop = &proc_reg_file_ops;
	426	} else {
	427	inode->i_fop = de->proc_fops;
	428	}
778f3dd5	429	}
786d7e16	430	}
a1d4aebb	431	unlock_new_inode(inode);
1da177e4	432	}
1da177e4 LT	433	return inode;
1da177e4 LT	434
e9543659 KK	435	out_ino:
	436	if (de != NULL)
	437	module_put(de->owner);
	438	out_mod:
e9543659	439	return NULL;
1da177e4 LT	440	}
1da177e4 LT	441
07543f5c	442	int proc_fill_super(struct super_block *s)
1da177e4 LT	443	{
	444	struct inode * root_inode;
	445
92d03285	446	s->s_flags \|= MS_NODIRATIME \| MS_NOSUID \| MS_NOEXEC;
1da177e4 LT	447	s->s_blocksize = 1024;
	448	s->s_blocksize_bits = 10;
	449	s->s_magic = PROC_SUPER_MAGIC;
	450	s->s_op = &proc_sops;
	451	s->s_time_gran = 1;
	452
7695650a	453	de_get(&proc_root);
1da177e4 LT	454	root_inode = proc_get_inode(s, PROC_ROOT_INO, &proc_root);
	455	if (!root_inode)
	456	goto out_no_root;
1da177e4 LT	457	root_inode->i_uid = 0;
	458	root_inode->i_gid = 0;
	459	s->s_root = d_alloc_root(root_inode);
	460	if (!s->s_root)
	461	goto out_no_root;
	462	return 0;
	463
	464	out_no_root:
	465	printk("proc_read_super: get root inode failed\n");
	466	iput(root_inode);
7695650a	467	de_put(&proc_root);
1da177e4 LT	468	return -ENOMEM;
1da177e4 LT	469	}