[deliverable/linux.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)
{
	atomic_inc(&de->count);
	return de;
}

/*
 * Decrements the use count and checks for deferred deletion.
 */
void de_put(struct proc_dir_entry *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 (!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->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);
	} else
	       module_put(de->owner);
	return inode;

out_ino:
	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	27	{
5e971dce	28	atomic_inc(&de->count);
1da177e4 LT	29	return de;
	30	}
	31
	32	/*
	33	* Decrements the use count and checks for deferred deletion.
	34	*/
7695650a	35	void de_put(struct proc_dir_entry *de)
1da177e4	36	{
5e971dce AD	37	lock_kernel();
	38	if (!atomic_read(&de->count)) {
	39	printk("de_put: entry %s already free!\n", de->name);
1da177e4	40	unlock_kernel();
5e971dce	41	return;
1da177e4	42	}
5e971dce AD	43
	44	if (atomic_dec_and_test(&de->count))
	45	free_proc_entry(de);
	46	unlock_kernel();
1da177e4 LT	47	}
	48
	49	/*
	50	* Decrement the use count of the proc_dir_entry.
	51	*/
	52	static void proc_delete_inode(struct inode *inode)
	53	{
	54	struct proc_dir_entry *de;
1da177e4	55
fef26658 MF	56	truncate_inode_pages(&inode->i_data, 0);
fef26658 MF	57
99f89551	58	/* Stop tracking associated processes */
13b41b09	59	put_pid(PROC_I(inode)->pid);
1da177e4 LT	60
	61	/* Let go of any associated proc directory entry */
	62	de = PROC_I(inode)->pde;
	63	if (de) {
	64	if (de->owner)
	65	module_put(de->owner);
	66	de_put(de);
	67	}
	68	clear_inode(inode);
	69	}
	70
	71	struct vfsmount *proc_mnt;
	72
e18b890b	73	static struct kmem_cache * proc_inode_cachep;
1da177e4 LT	74
	75	static struct inode proc_alloc_inode(struct super_block sb)
	76	{
	77	struct proc_inode *ei;
	78	struct inode *inode;
	79
e94b1766	80	ei = (struct proc_inode *)kmem_cache_alloc(proc_inode_cachep, GFP_KERNEL);
1da177e4 LT	81	if (!ei)
1da177e4 LT	82	return NULL;
13b41b09	83	ei->pid = NULL;
aed7a6c4	84	ei->fd = 0;
1da177e4 LT	85	ei->op.proc_get_link = NULL;
	86	ei->pde = NULL;
	87	inode = &ei->vfs_inode;
	88	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	89	return inode;
	90	}
	91
	92	static void proc_destroy_inode(struct inode *inode)
	93	{
	94	kmem_cache_free(proc_inode_cachep, PROC_I(inode));
	95	}
	96
4ba9b9d0	97	static void init_once(struct kmem_cache * cachep, void *foo)
1da177e4 LT	98	{
	99	struct proc_inode ei = (struct proc_inode ) foo;
	100
a35afb83	101	inode_init_once(&ei->vfs_inode);
1da177e4	102	}
20c2df83	103
1da177e4 LT	104	int __init proc_init_inodecache(void)
	105	{
	106	proc_inode_cachep = kmem_cache_create("proc_inode_cache",
	107	sizeof(struct proc_inode),
fffb60f9	108	0, (SLAB_RECLAIM_ACCOUNT\|
040b5c6f	109	SLAB_MEM_SPREAD\|SLAB_PANIC),
20c2df83	110	init_once);
1da177e4 LT	111	return 0;
	112	}
	113
	114	static int proc_remount(struct super_block sb, int flags, char *data)
	115	{
	116	*flags \|= MS_NODIRATIME;
	117	return 0;
	118	}
	119
ee9b6d61	120	static const struct super_operations proc_sops = {
1da177e4 LT	121	.alloc_inode = proc_alloc_inode,
1da177e4 LT	122	.destroy_inode = proc_destroy_inode,
1da177e4 LT	123	.drop_inode = generic_delete_inode,
	124	.delete_inode = proc_delete_inode,
	125	.statfs = simple_statfs,
	126	.remount_fs = proc_remount,
	127	};
	128
786d7e16 AD	129	static void pde_users_dec(struct proc_dir_entry *pde)
	130	{
	131	spin_lock(&pde->pde_unload_lock);
	132	pde->pde_users--;
	133	if (pde->pde_unload_completion && pde->pde_users == 0)
	134	complete(pde->pde_unload_completion);
	135	spin_unlock(&pde->pde_unload_lock);
	136	}
	137
	138	static loff_t proc_reg_llseek(struct file *file, loff_t offset, int whence)
	139	{
	140	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	141	loff_t rv = -EINVAL;
	142	loff_t (llseek)(struct file , loff_t, int);
	143
	144	spin_lock(&pde->pde_unload_lock);
	145	/*
	146	* remove_proc_entry() is going to delete PDE (as part of module
	147	* cleanup sequence). No new callers into module allowed.
	148	*/
	149	if (!pde->proc_fops) {
	150	spin_unlock(&pde->pde_unload_lock);
	151	return rv;
	152	}
	153	/*
	154	* Bump refcount so that remove_proc_entry will wail for ->llseek to
	155	* complete.
	156	*/
	157	pde->pde_users++;
	158	/*
	159	* Save function pointer under lock, to protect against ->proc_fops
	160	* NULL'ifying right after ->pde_unload_lock is dropped.
	161	*/
	162	llseek = pde->proc_fops->llseek;
	163	spin_unlock(&pde->pde_unload_lock);
	164
	165	if (!llseek)
	166	llseek = default_llseek;
	167	rv = llseek(file, offset, whence);
	168
	169	pde_users_dec(pde);
	170	return rv;
	171	}
	172
	173	static ssize_t proc_reg_read(struct file file, char __user buf, size_t count, loff_t *ppos)
	174	{
	175	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	176	ssize_t rv = -EIO;
	177	ssize_t (read)(struct file , char __user , size_t, loff_t );
	178
	179	spin_lock(&pde->pde_unload_lock);
	180	if (!pde->proc_fops) {
	181	spin_unlock(&pde->pde_unload_lock);
	182	return rv;
	183	}
	184	pde->pde_users++;
	185	read = pde->proc_fops->read;
	186	spin_unlock(&pde->pde_unload_lock);
	187
	188	if (read)
	189	rv = read(file, buf, count, ppos);
	190
	191	pde_users_dec(pde);
	192	return rv;
193	}
194
195	static ssize_t proc_reg_write(struct file file, const char __user buf, size_t count, loff_t *ppos)
196	{
197	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
198	ssize_t rv = -EIO;
199	ssize_t (write)(struct file , const char __user , size_t, loff_t );
200
201	spin_lock(&pde->pde_unload_lock);
202	if (!pde->proc_fops) {
203	spin_unlock(&pde->pde_unload_lock);
204	return rv;
205	}
206	pde->pde_users++;
207	write = pde->proc_fops->write;
208	spin_unlock(&pde->pde_unload_lock);
209
210	if (write)
211	rv = write(file, buf, count, ppos);
212
213	pde_users_dec(pde);
214	return rv;
215	}
216
217	static unsigned int proc_reg_poll(struct file file, struct poll_table_struct pts)
218	{
219	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
dd23aae4	220	unsigned int rv = DEFAULT_POLLMASK;
786d7e16 AD	221	unsigned int (poll)(struct file , struct poll_table_struct *);
	222
	223	spin_lock(&pde->pde_unload_lock);
	224	if (!pde->proc_fops) {
	225	spin_unlock(&pde->pde_unload_lock);
	226	return rv;
	227	}
	228	pde->pde_users++;
	229	poll = pde->proc_fops->poll;
	230	spin_unlock(&pde->pde_unload_lock);
	231
	232	if (poll)
	233	rv = poll(file, pts);
	234
	235	pde_users_dec(pde);
	236	return rv;
	237	}
	238
	239	static long proc_reg_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	240	{
	241	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	242	long rv = -ENOTTY;
	243	long (unlocked_ioctl)(struct file , unsigned int, unsigned long);
	244	int (ioctl)(struct inode , struct file *, unsigned int, unsigned long);
	245
	246	spin_lock(&pde->pde_unload_lock);
	247	if (!pde->proc_fops) {
	248	spin_unlock(&pde->pde_unload_lock);
	249	return rv;
	250	}
	251	pde->pde_users++;
	252	unlocked_ioctl = pde->proc_fops->unlocked_ioctl;
	253	ioctl = pde->proc_fops->ioctl;
	254	spin_unlock(&pde->pde_unload_lock);
	255
	256	if (unlocked_ioctl) {
	257	rv = unlocked_ioctl(file, cmd, arg);
	258	if (rv == -ENOIOCTLCMD)
	259	rv = -EINVAL;
	260	} else if (ioctl) {
	261	lock_kernel();
	262	rv = ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
	263	unlock_kernel();
	264	}
	265
	266	pde_users_dec(pde);
	267	return rv;
	268	}
	269
	270	#ifdef CONFIG_COMPAT
	271	static long proc_reg_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	272	{
	273	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
	274	long rv = -ENOTTY;
	275	long (compat_ioctl)(struct file , unsigned int, unsigned long);
	276
	277	spin_lock(&pde->pde_unload_lock);
	278	if (!pde->proc_fops) {
	279	spin_unlock(&pde->pde_unload_lock);
	280	return rv;
	281	}
	282	pde->pde_users++;
	283	compat_ioctl = pde->proc_fops->compat_ioctl;
	284	spin_unlock(&pde->pde_unload_lock);
285
286	if (compat_ioctl)
287	rv = compat_ioctl(file, cmd, arg);
288
289	pde_users_dec(pde);
290	return rv;
291	}
292	#endif
293
294	static int proc_reg_mmap(struct file file, struct vm_area_struct vma)
295	{
296	struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
297	int rv = -EIO;
298	int (mmap)(struct file , struct vm_area_struct *);
299
300	spin_lock(&pde->pde_unload_lock);
301	if (!pde->proc_fops) {
302	spin_unlock(&pde->pde_unload_lock);
303	return rv;
304	}
305	pde->pde_users++;
306	mmap = pde->proc_fops->mmap;
307	spin_unlock(&pde->pde_unload_lock);
308
309	if (mmap)
310	rv = mmap(file, vma);
311
312	pde_users_dec(pde);
313	return rv;
314	}
315
316	static int proc_reg_open(struct inode inode, struct file file)
317	{
318	struct proc_dir_entry *pde = PDE(inode);
319	int rv = 0;
320	int (open)(struct inode , struct file *);
321
322	spin_lock(&pde->pde_unload_lock);
323	if (!pde->proc_fops) {
324	spin_unlock(&pde->pde_unload_lock);
325	return rv;
326	}
327	pde->pde_users++;
328	open = pde->proc_fops->open;
329	spin_unlock(&pde->pde_unload_lock);
330
331	if (open)
332	rv = open(inode, file);
333
334	pde_users_dec(pde);
335	return rv;
336	}
337
338	static int proc_reg_release(struct inode inode, struct file file)
339	{
340	struct proc_dir_entry *pde = PDE(inode);
341	int rv = 0;
342	int (release)(struct inode , struct file *);
343
344	spin_lock(&pde->pde_unload_lock);
345	if (!pde->proc_fops) {
346	spin_unlock(&pde->pde_unload_lock);
347	return rv;
348	}
349	pde->pde_users++;
350	release = pde->proc_fops->release;
351	spin_unlock(&pde->pde_unload_lock);
352
353	if (release)
354	rv = release(inode, file);
355
356	pde_users_dec(pde);
357	return rv;
358	}
359
360	static const struct file_operations proc_reg_file_ops = {
361	.llseek = proc_reg_llseek,
362	.read = proc_reg_read,
363	.write = proc_reg_write,
364	.poll = proc_reg_poll,
365	.unlocked_ioctl = proc_reg_unlocked_ioctl,
366	#ifdef CONFIG_COMPAT
367	.compat_ioctl = proc_reg_compat_ioctl,
368	#endif
369	.mmap = proc_reg_mmap,
370	.open = proc_reg_open,
371	.release = proc_reg_release,
372	};
373
778f3dd5 DM	374	#ifdef CONFIG_COMPAT
	375	static const struct file_operations proc_reg_file_ops_no_compat = {
	376	.llseek = proc_reg_llseek,
	377	.read = proc_reg_read,
	378	.write = proc_reg_write,
	379	.poll = proc_reg_poll,
	380	.unlocked_ioctl = proc_reg_unlocked_ioctl,
	381	.mmap = proc_reg_mmap,
	382	.open = proc_reg_open,
	383	.release = proc_reg_release,
	384	};
	385	#endif
	386
1da177e4 LT	387	struct inode proc_get_inode(struct super_block sb, unsigned int ino,
	388	struct proc_dir_entry *de)
	389	{
	390	struct inode * inode;
	391
5e971dce	392	if (!try_module_get(de->owner))
e9543659 KK	393	goto out_mod;
e9543659 KK	394
a1d4aebb	395	inode = iget_locked(sb, ino);
1da177e4	396	if (!inode)
e9543659	397	goto out_ino;
a1d4aebb DH	398	if (inode->i_state & I_NEW) {
	399	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	400	PROC_I(inode)->fd = 0;
	401	PROC_I(inode)->pde = de;
5e971dce AD	402
	403	if (de->mode) {
	404	inode->i_mode = de->mode;
	405	inode->i_uid = de->uid;
	406	inode->i_gid = de->gid;
	407	}
	408	if (de->size)
	409	inode->i_size = de->size;
	410	if (de->nlink)
	411	inode->i_nlink = de->nlink;
	412	if (de->proc_iops)
	413	inode->i_op = de->proc_iops;
	414	if (de->proc_fops) {
	415	if (S_ISREG(inode->i_mode)) {
778f3dd5	416	#ifdef CONFIG_COMPAT
5e971dce AD	417	if (!de->proc_fops->compat_ioctl)
	418	inode->i_fop =
	419	&proc_reg_file_ops_no_compat;
	420	else
778f3dd5	421	#endif
5e971dce AD	422	inode->i_fop = &proc_reg_file_ops;
	423	} else {
	424	inode->i_fop = de->proc_fops;
778f3dd5	425	}
786d7e16	426	}
a1d4aebb	427	unlock_new_inode(inode);
c4185a0e DL	428	} else
c4185a0e DL	429	module_put(de->owner);
1da177e4 LT	430	return inode;
1da177e4 LT	431
e9543659	432	out_ino:
5e971dce	433	module_put(de->owner);
e9543659	434	out_mod:
e9543659	435	return NULL;
1da177e4 LT	436	}
1da177e4 LT	437
07543f5c	438	int proc_fill_super(struct super_block *s)
1da177e4 LT	439	{
	440	struct inode * root_inode;
	441
92d03285	442	s->s_flags \|= MS_NODIRATIME \| MS_NOSUID \| MS_NOEXEC;
1da177e4 LT	443	s->s_blocksize = 1024;
	444	s->s_blocksize_bits = 10;
	445	s->s_magic = PROC_SUPER_MAGIC;
	446	s->s_op = &proc_sops;
	447	s->s_time_gran = 1;
	448
7695650a	449	de_get(&proc_root);
1da177e4 LT	450	root_inode = proc_get_inode(s, PROC_ROOT_INO, &proc_root);
	451	if (!root_inode)
	452	goto out_no_root;
1da177e4 LT	453	root_inode->i_uid = 0;
	454	root_inode->i_gid = 0;
	455	s->s_root = d_alloc_root(root_inode);
	456	if (!s->s_root)
	457	goto out_no_root;
	458	return 0;
	459
	460	out_no_root:
	461	printk("proc_read_super: get root inode failed\n");
	462	iput(root_inode);
7695650a	463	de_put(&proc_root);
1da177e4 LT	464	return -ENOMEM;
1da177e4 LT	465	}