mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 00:40:03 +00:00
![Waiman Long](/assets/img/avatar_default.png)
The proc_subdir_lock spinlock is used to allow only one task to make change to the proc directory structure as well as looking up information in it. However, the information lookup part can actually be entered by more than one task as the pde_get() and pde_put() reference count update calls in the critical sections are atomic increment and decrement respectively and so are safe with concurrent updates. The x86 architecture has already used qrwlock which is fair and other architectures like ARM are in the process of switching to qrwlock. So unfairness shouldn't be a concern in that conversion. This patch changed the proc_subdir_lock to a rwlock in order to enable concurrent lookup. The following functions were modified to take a write lock: - proc_register() - remove_proc_entry() - remove_proc_subtree() The following functions were modified to take a read lock: - xlate_proc_name() - proc_lookup_de() - proc_readdir_de() A parallel /proc filesystem search with the "find" command (1000 threads) was run on a 4-socket Haswell-EX box (144 threads). Before the patch, the parallel search took about 39s. After the patch, the parallel find took only 25s, a saving of about 14s. The micro-benchmark that I used was artificial, but it was used to reproduce an exit hanging problem that I saw in real application. In fact, only allow one task to do a lookup seems too limiting to me. Signed-off-by: Waiman Long <Waiman.Long@hp.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Scott J Norton <scott.norton@hp.com> Cc: Douglas Hatch <doug.hatch@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
645 lines
14 KiB
C
645 lines
14 KiB
C
/*
|
|
* proc/fs/generic.c --- generic routines for the proc-fs
|
|
*
|
|
* This file contains generic proc-fs routines for handling
|
|
* directories and files.
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds.
|
|
* Copyright (C) 1997 Theodore Ts'o
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/time.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/printk.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/init.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/completion.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static DEFINE_RWLOCK(proc_subdir_lock);
|
|
|
|
static int proc_match(unsigned int len, const char *name, struct proc_dir_entry *de)
|
|
{
|
|
if (len < de->namelen)
|
|
return -1;
|
|
if (len > de->namelen)
|
|
return 1;
|
|
|
|
return memcmp(name, de->name, len);
|
|
}
|
|
|
|
static struct proc_dir_entry *pde_subdir_first(struct proc_dir_entry *dir)
|
|
{
|
|
return rb_entry_safe(rb_first(&dir->subdir), struct proc_dir_entry,
|
|
subdir_node);
|
|
}
|
|
|
|
static struct proc_dir_entry *pde_subdir_next(struct proc_dir_entry *dir)
|
|
{
|
|
return rb_entry_safe(rb_next(&dir->subdir_node), struct proc_dir_entry,
|
|
subdir_node);
|
|
}
|
|
|
|
static struct proc_dir_entry *pde_subdir_find(struct proc_dir_entry *dir,
|
|
const char *name,
|
|
unsigned int len)
|
|
{
|
|
struct rb_node *node = dir->subdir.rb_node;
|
|
|
|
while (node) {
|
|
struct proc_dir_entry *de = container_of(node,
|
|
struct proc_dir_entry,
|
|
subdir_node);
|
|
int result = proc_match(len, name, de);
|
|
|
|
if (result < 0)
|
|
node = node->rb_left;
|
|
else if (result > 0)
|
|
node = node->rb_right;
|
|
else
|
|
return de;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static bool pde_subdir_insert(struct proc_dir_entry *dir,
|
|
struct proc_dir_entry *de)
|
|
{
|
|
struct rb_root *root = &dir->subdir;
|
|
struct rb_node **new = &root->rb_node, *parent = NULL;
|
|
|
|
/* Figure out where to put new node */
|
|
while (*new) {
|
|
struct proc_dir_entry *this =
|
|
container_of(*new, struct proc_dir_entry, subdir_node);
|
|
int result = proc_match(de->namelen, de->name, this);
|
|
|
|
parent = *new;
|
|
if (result < 0)
|
|
new = &(*new)->rb_left;
|
|
else if (result > 0)
|
|
new = &(*new)->rb_right;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
/* Add new node and rebalance tree. */
|
|
rb_link_node(&de->subdir_node, parent, new);
|
|
rb_insert_color(&de->subdir_node, root);
|
|
return true;
|
|
}
|
|
|
|
static int proc_notify_change(struct dentry *dentry, struct iattr *iattr)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct proc_dir_entry *de = PDE(inode);
|
|
int error;
|
|
|
|
error = inode_change_ok(inode, iattr);
|
|
if (error)
|
|
return error;
|
|
|
|
setattr_copy(inode, iattr);
|
|
mark_inode_dirty(inode);
|
|
|
|
proc_set_user(de, inode->i_uid, inode->i_gid);
|
|
de->mode = inode->i_mode;
|
|
return 0;
|
|
}
|
|
|
|
static int proc_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct proc_dir_entry *de = PDE(inode);
|
|
if (de && de->nlink)
|
|
set_nlink(inode, de->nlink);
|
|
|
|
generic_fillattr(inode, stat);
|
|
return 0;
|
|
}
|
|
|
|
static const struct inode_operations proc_file_inode_operations = {
|
|
.setattr = proc_notify_change,
|
|
};
|
|
|
|
/*
|
|
* This function parses a name such as "tty/driver/serial", and
|
|
* returns the struct proc_dir_entry for "/proc/tty/driver", and
|
|
* returns "serial" in residual.
|
|
*/
|
|
static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret,
|
|
const char **residual)
|
|
{
|
|
const char *cp = name, *next;
|
|
struct proc_dir_entry *de;
|
|
unsigned int len;
|
|
|
|
de = *ret;
|
|
if (!de)
|
|
de = &proc_root;
|
|
|
|
while (1) {
|
|
next = strchr(cp, '/');
|
|
if (!next)
|
|
break;
|
|
|
|
len = next - cp;
|
|
de = pde_subdir_find(de, cp, len);
|
|
if (!de) {
|
|
WARN(1, "name '%s'\n", name);
|
|
return -ENOENT;
|
|
}
|
|
cp += len + 1;
|
|
}
|
|
*residual = cp;
|
|
*ret = de;
|
|
return 0;
|
|
}
|
|
|
|
static int xlate_proc_name(const char *name, struct proc_dir_entry **ret,
|
|
const char **residual)
|
|
{
|
|
int rv;
|
|
|
|
read_lock(&proc_subdir_lock);
|
|
rv = __xlate_proc_name(name, ret, residual);
|
|
read_unlock(&proc_subdir_lock);
|
|
return rv;
|
|
}
|
|
|
|
static DEFINE_IDA(proc_inum_ida);
|
|
static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */
|
|
|
|
#define PROC_DYNAMIC_FIRST 0xF0000000U
|
|
|
|
/*
|
|
* Return an inode number between PROC_DYNAMIC_FIRST and
|
|
* 0xffffffff, or zero on failure.
|
|
*/
|
|
int proc_alloc_inum(unsigned int *inum)
|
|
{
|
|
unsigned int i;
|
|
int error;
|
|
|
|
retry:
|
|
if (!ida_pre_get(&proc_inum_ida, GFP_KERNEL))
|
|
return -ENOMEM;
|
|
|
|
spin_lock_irq(&proc_inum_lock);
|
|
error = ida_get_new(&proc_inum_ida, &i);
|
|
spin_unlock_irq(&proc_inum_lock);
|
|
if (error == -EAGAIN)
|
|
goto retry;
|
|
else if (error)
|
|
return error;
|
|
|
|
if (i > UINT_MAX - PROC_DYNAMIC_FIRST) {
|
|
spin_lock_irq(&proc_inum_lock);
|
|
ida_remove(&proc_inum_ida, i);
|
|
spin_unlock_irq(&proc_inum_lock);
|
|
return -ENOSPC;
|
|
}
|
|
*inum = PROC_DYNAMIC_FIRST + i;
|
|
return 0;
|
|
}
|
|
|
|
void proc_free_inum(unsigned int inum)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&proc_inum_lock, flags);
|
|
ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
|
|
spin_unlock_irqrestore(&proc_inum_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Don't create negative dentries here, return -ENOENT by hand
|
|
* instead.
|
|
*/
|
|
struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct inode *inode;
|
|
|
|
read_lock(&proc_subdir_lock);
|
|
de = pde_subdir_find(de, dentry->d_name.name, dentry->d_name.len);
|
|
if (de) {
|
|
pde_get(de);
|
|
read_unlock(&proc_subdir_lock);
|
|
inode = proc_get_inode(dir->i_sb, de);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
d_set_d_op(dentry, &simple_dentry_operations);
|
|
d_add(dentry, inode);
|
|
return NULL;
|
|
}
|
|
read_unlock(&proc_subdir_lock);
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
struct dentry *proc_lookup(struct inode *dir, struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
return proc_lookup_de(PDE(dir), dir, dentry);
|
|
}
|
|
|
|
/*
|
|
* This returns non-zero if at EOF, so that the /proc
|
|
* root directory can use this and check if it should
|
|
* continue with the <pid> entries..
|
|
*
|
|
* Note that the VFS-layer doesn't care about the return
|
|
* value of the readdir() call, as long as it's non-negative
|
|
* for success..
|
|
*/
|
|
int proc_readdir_de(struct proc_dir_entry *de, struct file *file,
|
|
struct dir_context *ctx)
|
|
{
|
|
int i;
|
|
|
|
if (!dir_emit_dots(file, ctx))
|
|
return 0;
|
|
|
|
read_lock(&proc_subdir_lock);
|
|
de = pde_subdir_first(de);
|
|
i = ctx->pos - 2;
|
|
for (;;) {
|
|
if (!de) {
|
|
read_unlock(&proc_subdir_lock);
|
|
return 0;
|
|
}
|
|
if (!i)
|
|
break;
|
|
de = pde_subdir_next(de);
|
|
i--;
|
|
}
|
|
|
|
do {
|
|
struct proc_dir_entry *next;
|
|
pde_get(de);
|
|
read_unlock(&proc_subdir_lock);
|
|
if (!dir_emit(ctx, de->name, de->namelen,
|
|
de->low_ino, de->mode >> 12)) {
|
|
pde_put(de);
|
|
return 0;
|
|
}
|
|
read_lock(&proc_subdir_lock);
|
|
ctx->pos++;
|
|
next = pde_subdir_next(de);
|
|
pde_put(de);
|
|
de = next;
|
|
} while (de);
|
|
read_unlock(&proc_subdir_lock);
|
|
return 1;
|
|
}
|
|
|
|
int proc_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
|
|
return proc_readdir_de(PDE(inode), file, ctx);
|
|
}
|
|
|
|
/*
|
|
* These are the generic /proc directory operations. They
|
|
* use the in-memory "struct proc_dir_entry" tree to parse
|
|
* the /proc directory.
|
|
*/
|
|
static const struct file_operations proc_dir_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_read_dir,
|
|
.iterate = proc_readdir,
|
|
};
|
|
|
|
/*
|
|
* proc directories can do almost nothing..
|
|
*/
|
|
static const struct inode_operations proc_dir_inode_operations = {
|
|
.lookup = proc_lookup,
|
|
.getattr = proc_getattr,
|
|
.setattr = proc_notify_change,
|
|
};
|
|
|
|
static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp)
|
|
{
|
|
int ret;
|
|
|
|
ret = proc_alloc_inum(&dp->low_ino);
|
|
if (ret)
|
|
return ret;
|
|
|
|
write_lock(&proc_subdir_lock);
|
|
dp->parent = dir;
|
|
if (pde_subdir_insert(dir, dp) == false) {
|
|
WARN(1, "proc_dir_entry '%s/%s' already registered\n",
|
|
dir->name, dp->name);
|
|
write_unlock(&proc_subdir_lock);
|
|
proc_free_inum(dp->low_ino);
|
|
return -EEXIST;
|
|
}
|
|
write_unlock(&proc_subdir_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
|
|
const char *name,
|
|
umode_t mode,
|
|
nlink_t nlink)
|
|
{
|
|
struct proc_dir_entry *ent = NULL;
|
|
const char *fn;
|
|
struct qstr qstr;
|
|
|
|
if (xlate_proc_name(name, parent, &fn) != 0)
|
|
goto out;
|
|
qstr.name = fn;
|
|
qstr.len = strlen(fn);
|
|
if (qstr.len == 0 || qstr.len >= 256) {
|
|
WARN(1, "name len %u\n", qstr.len);
|
|
return NULL;
|
|
}
|
|
if (*parent == &proc_root && name_to_int(&qstr) != ~0U) {
|
|
WARN(1, "create '/proc/%s' by hand\n", qstr.name);
|
|
return NULL;
|
|
}
|
|
if (is_empty_pde(*parent)) {
|
|
WARN(1, "attempt to add to permanently empty directory");
|
|
return NULL;
|
|
}
|
|
|
|
ent = kzalloc(sizeof(struct proc_dir_entry) + qstr.len + 1, GFP_KERNEL);
|
|
if (!ent)
|
|
goto out;
|
|
|
|
memcpy(ent->name, fn, qstr.len + 1);
|
|
ent->namelen = qstr.len;
|
|
ent->mode = mode;
|
|
ent->nlink = nlink;
|
|
ent->subdir = RB_ROOT;
|
|
atomic_set(&ent->count, 1);
|
|
spin_lock_init(&ent->pde_unload_lock);
|
|
INIT_LIST_HEAD(&ent->pde_openers);
|
|
out:
|
|
return ent;
|
|
}
|
|
|
|
struct proc_dir_entry *proc_symlink(const char *name,
|
|
struct proc_dir_entry *parent, const char *dest)
|
|
{
|
|
struct proc_dir_entry *ent;
|
|
|
|
ent = __proc_create(&parent, name,
|
|
(S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1);
|
|
|
|
if (ent) {
|
|
ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL);
|
|
if (ent->data) {
|
|
strcpy((char*)ent->data,dest);
|
|
ent->proc_iops = &proc_link_inode_operations;
|
|
if (proc_register(parent, ent) < 0) {
|
|
kfree(ent->data);
|
|
kfree(ent);
|
|
ent = NULL;
|
|
}
|
|
} else {
|
|
kfree(ent);
|
|
ent = NULL;
|
|
}
|
|
}
|
|
return ent;
|
|
}
|
|
EXPORT_SYMBOL(proc_symlink);
|
|
|
|
struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode,
|
|
struct proc_dir_entry *parent, void *data)
|
|
{
|
|
struct proc_dir_entry *ent;
|
|
|
|
if (mode == 0)
|
|
mode = S_IRUGO | S_IXUGO;
|
|
|
|
ent = __proc_create(&parent, name, S_IFDIR | mode, 2);
|
|
if (ent) {
|
|
ent->data = data;
|
|
ent->proc_fops = &proc_dir_operations;
|
|
ent->proc_iops = &proc_dir_inode_operations;
|
|
parent->nlink++;
|
|
if (proc_register(parent, ent) < 0) {
|
|
kfree(ent);
|
|
parent->nlink--;
|
|
ent = NULL;
|
|
}
|
|
}
|
|
return ent;
|
|
}
|
|
EXPORT_SYMBOL_GPL(proc_mkdir_data);
|
|
|
|
struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode,
|
|
struct proc_dir_entry *parent)
|
|
{
|
|
return proc_mkdir_data(name, mode, parent, NULL);
|
|
}
|
|
EXPORT_SYMBOL(proc_mkdir_mode);
|
|
|
|
struct proc_dir_entry *proc_mkdir(const char *name,
|
|
struct proc_dir_entry *parent)
|
|
{
|
|
return proc_mkdir_data(name, 0, parent, NULL);
|
|
}
|
|
EXPORT_SYMBOL(proc_mkdir);
|
|
|
|
struct proc_dir_entry *proc_create_mount_point(const char *name)
|
|
{
|
|
umode_t mode = S_IFDIR | S_IRUGO | S_IXUGO;
|
|
struct proc_dir_entry *ent, *parent = NULL;
|
|
|
|
ent = __proc_create(&parent, name, mode, 2);
|
|
if (ent) {
|
|
ent->data = NULL;
|
|
ent->proc_fops = NULL;
|
|
ent->proc_iops = NULL;
|
|
if (proc_register(parent, ent) < 0) {
|
|
kfree(ent);
|
|
parent->nlink--;
|
|
ent = NULL;
|
|
}
|
|
}
|
|
return ent;
|
|
}
|
|
|
|
struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
|
|
struct proc_dir_entry *parent,
|
|
const struct file_operations *proc_fops,
|
|
void *data)
|
|
{
|
|
struct proc_dir_entry *pde;
|
|
if ((mode & S_IFMT) == 0)
|
|
mode |= S_IFREG;
|
|
|
|
if (!S_ISREG(mode)) {
|
|
WARN_ON(1); /* use proc_mkdir() */
|
|
return NULL;
|
|
}
|
|
|
|
BUG_ON(proc_fops == NULL);
|
|
|
|
if ((mode & S_IALLUGO) == 0)
|
|
mode |= S_IRUGO;
|
|
pde = __proc_create(&parent, name, mode, 1);
|
|
if (!pde)
|
|
goto out;
|
|
pde->proc_fops = proc_fops;
|
|
pde->data = data;
|
|
pde->proc_iops = &proc_file_inode_operations;
|
|
if (proc_register(parent, pde) < 0)
|
|
goto out_free;
|
|
return pde;
|
|
out_free:
|
|
kfree(pde);
|
|
out:
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(proc_create_data);
|
|
|
|
void proc_set_size(struct proc_dir_entry *de, loff_t size)
|
|
{
|
|
de->size = size;
|
|
}
|
|
EXPORT_SYMBOL(proc_set_size);
|
|
|
|
void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid)
|
|
{
|
|
de->uid = uid;
|
|
de->gid = gid;
|
|
}
|
|
EXPORT_SYMBOL(proc_set_user);
|
|
|
|
static void free_proc_entry(struct proc_dir_entry *de)
|
|
{
|
|
proc_free_inum(de->low_ino);
|
|
|
|
if (S_ISLNK(de->mode))
|
|
kfree(de->data);
|
|
kfree(de);
|
|
}
|
|
|
|
void pde_put(struct proc_dir_entry *pde)
|
|
{
|
|
if (atomic_dec_and_test(&pde->count))
|
|
free_proc_entry(pde);
|
|
}
|
|
|
|
/*
|
|
* Remove a /proc entry and free it if it's not currently in use.
|
|
*/
|
|
void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
|
|
{
|
|
struct proc_dir_entry *de = NULL;
|
|
const char *fn = name;
|
|
unsigned int len;
|
|
|
|
write_lock(&proc_subdir_lock);
|
|
if (__xlate_proc_name(name, &parent, &fn) != 0) {
|
|
write_unlock(&proc_subdir_lock);
|
|
return;
|
|
}
|
|
len = strlen(fn);
|
|
|
|
de = pde_subdir_find(parent, fn, len);
|
|
if (de)
|
|
rb_erase(&de->subdir_node, &parent->subdir);
|
|
write_unlock(&proc_subdir_lock);
|
|
if (!de) {
|
|
WARN(1, "name '%s'\n", name);
|
|
return;
|
|
}
|
|
|
|
proc_entry_rundown(de);
|
|
|
|
if (S_ISDIR(de->mode))
|
|
parent->nlink--;
|
|
de->nlink = 0;
|
|
WARN(pde_subdir_first(de),
|
|
"%s: removing non-empty directory '%s/%s', leaking at least '%s'\n",
|
|
__func__, de->parent->name, de->name, pde_subdir_first(de)->name);
|
|
pde_put(de);
|
|
}
|
|
EXPORT_SYMBOL(remove_proc_entry);
|
|
|
|
int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
|
|
{
|
|
struct proc_dir_entry *root = NULL, *de, *next;
|
|
const char *fn = name;
|
|
unsigned int len;
|
|
|
|
write_lock(&proc_subdir_lock);
|
|
if (__xlate_proc_name(name, &parent, &fn) != 0) {
|
|
write_unlock(&proc_subdir_lock);
|
|
return -ENOENT;
|
|
}
|
|
len = strlen(fn);
|
|
|
|
root = pde_subdir_find(parent, fn, len);
|
|
if (!root) {
|
|
write_unlock(&proc_subdir_lock);
|
|
return -ENOENT;
|
|
}
|
|
rb_erase(&root->subdir_node, &parent->subdir);
|
|
|
|
de = root;
|
|
while (1) {
|
|
next = pde_subdir_first(de);
|
|
if (next) {
|
|
rb_erase(&next->subdir_node, &de->subdir);
|
|
de = next;
|
|
continue;
|
|
}
|
|
write_unlock(&proc_subdir_lock);
|
|
|
|
proc_entry_rundown(de);
|
|
next = de->parent;
|
|
if (S_ISDIR(de->mode))
|
|
next->nlink--;
|
|
de->nlink = 0;
|
|
if (de == root)
|
|
break;
|
|
pde_put(de);
|
|
|
|
write_lock(&proc_subdir_lock);
|
|
de = next;
|
|
}
|
|
pde_put(root);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(remove_proc_subtree);
|
|
|
|
void *proc_get_parent_data(const struct inode *inode)
|
|
{
|
|
struct proc_dir_entry *de = PDE(inode);
|
|
return de->parent->data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(proc_get_parent_data);
|
|
|
|
void proc_remove(struct proc_dir_entry *de)
|
|
{
|
|
if (de)
|
|
remove_proc_subtree(de->name, de->parent);
|
|
}
|
|
EXPORT_SYMBOL(proc_remove);
|
|
|
|
void *PDE_DATA(const struct inode *inode)
|
|
{
|
|
return __PDE_DATA(inode);
|
|
}
|
|
EXPORT_SYMBOL(PDE_DATA);
|