Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
242
fs/devpts/inode.c
Normal file
242
fs/devpts/inode.c
Normal file
@@ -0,0 +1,242 @@
|
||||
/* -*- linux-c -*- --------------------------------------------------------- *
|
||||
*
|
||||
* linux/fs/devpts/inode.c
|
||||
*
|
||||
* Copyright 1998-2004 H. Peter Anvin -- All Rights Reserved
|
||||
*
|
||||
* This file is part of the Linux kernel and is made available under
|
||||
* the terms of the GNU General Public License, version 2, or at your
|
||||
* option, any later version, incorporated herein by reference.
|
||||
*
|
||||
* ------------------------------------------------------------------------- */
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/namei.h>
|
||||
#include <linux/mount.h>
|
||||
#include <linux/tty.h>
|
||||
#include <linux/devpts_fs.h>
|
||||
#include <linux/xattr.h>
|
||||
|
||||
#define DEVPTS_SUPER_MAGIC 0x1cd1
|
||||
|
||||
extern struct xattr_handler devpts_xattr_security_handler;
|
||||
|
||||
static struct xattr_handler *devpts_xattr_handlers[] = {
|
||||
#ifdef CONFIG_DEVPTS_FS_SECURITY
|
||||
&devpts_xattr_security_handler,
|
||||
#endif
|
||||
NULL
|
||||
};
|
||||
|
||||
static struct inode_operations devpts_file_inode_operations = {
|
||||
#ifdef CONFIG_DEVPTS_FS_XATTR
|
||||
.setxattr = generic_setxattr,
|
||||
.getxattr = generic_getxattr,
|
||||
.listxattr = generic_listxattr,
|
||||
.removexattr = generic_removexattr,
|
||||
#endif
|
||||
};
|
||||
|
||||
static struct vfsmount *devpts_mnt;
|
||||
static struct dentry *devpts_root;
|
||||
|
||||
static struct {
|
||||
int setuid;
|
||||
int setgid;
|
||||
uid_t uid;
|
||||
gid_t gid;
|
||||
umode_t mode;
|
||||
} config = {.mode = 0600};
|
||||
|
||||
static int devpts_remount(struct super_block *sb, int *flags, char *data)
|
||||
{
|
||||
int setuid = 0;
|
||||
int setgid = 0;
|
||||
uid_t uid = 0;
|
||||
gid_t gid = 0;
|
||||
umode_t mode = 0600;
|
||||
char *this_char;
|
||||
|
||||
this_char = NULL;
|
||||
while ((this_char = strsep(&data, ",")) != NULL) {
|
||||
int n;
|
||||
char dummy;
|
||||
if (!*this_char)
|
||||
continue;
|
||||
if (sscanf(this_char, "uid=%i%c", &n, &dummy) == 1) {
|
||||
setuid = 1;
|
||||
uid = n;
|
||||
} else if (sscanf(this_char, "gid=%i%c", &n, &dummy) == 1) {
|
||||
setgid = 1;
|
||||
gid = n;
|
||||
} else if (sscanf(this_char, "mode=%o%c", &n, &dummy) == 1)
|
||||
mode = n & ~S_IFMT;
|
||||
else {
|
||||
printk("devpts: called with bogus options\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
config.setuid = setuid;
|
||||
config.setgid = setgid;
|
||||
config.uid = uid;
|
||||
config.gid = gid;
|
||||
config.mode = mode;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct super_operations devpts_sops = {
|
||||
.statfs = simple_statfs,
|
||||
.remount_fs = devpts_remount,
|
||||
};
|
||||
|
||||
static int
|
||||
devpts_fill_super(struct super_block *s, void *data, int silent)
|
||||
{
|
||||
struct inode * inode;
|
||||
|
||||
s->s_blocksize = 1024;
|
||||
s->s_blocksize_bits = 10;
|
||||
s->s_magic = DEVPTS_SUPER_MAGIC;
|
||||
s->s_op = &devpts_sops;
|
||||
s->s_xattr = devpts_xattr_handlers;
|
||||
s->s_time_gran = 1;
|
||||
|
||||
inode = new_inode(s);
|
||||
if (!inode)
|
||||
goto fail;
|
||||
inode->i_ino = 1;
|
||||
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
||||
inode->i_blocks = 0;
|
||||
inode->i_blksize = 1024;
|
||||
inode->i_uid = inode->i_gid = 0;
|
||||
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR;
|
||||
inode->i_op = &simple_dir_inode_operations;
|
||||
inode->i_fop = &simple_dir_operations;
|
||||
inode->i_nlink = 2;
|
||||
|
||||
devpts_root = s->s_root = d_alloc_root(inode);
|
||||
if (s->s_root)
|
||||
return 0;
|
||||
|
||||
printk("devpts: get root dentry failed\n");
|
||||
iput(inode);
|
||||
fail:
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
static struct super_block *devpts_get_sb(struct file_system_type *fs_type,
|
||||
int flags, const char *dev_name, void *data)
|
||||
{
|
||||
return get_sb_single(fs_type, flags, data, devpts_fill_super);
|
||||
}
|
||||
|
||||
static struct file_system_type devpts_fs_type = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "devpts",
|
||||
.get_sb = devpts_get_sb,
|
||||
.kill_sb = kill_anon_super,
|
||||
};
|
||||
|
||||
/*
|
||||
* The normal naming convention is simply /dev/pts/<number>; this conforms
|
||||
* to the System V naming convention
|
||||
*/
|
||||
|
||||
static struct dentry *get_node(int num)
|
||||
{
|
||||
char s[12];
|
||||
struct dentry *root = devpts_root;
|
||||
down(&root->d_inode->i_sem);
|
||||
return lookup_one_len(s, root, sprintf(s, "%d", num));
|
||||
}
|
||||
|
||||
int devpts_pty_new(struct tty_struct *tty)
|
||||
{
|
||||
int number = tty->index;
|
||||
struct tty_driver *driver = tty->driver;
|
||||
dev_t device = MKDEV(driver->major, driver->minor_start+number);
|
||||
struct dentry *dentry;
|
||||
struct inode *inode = new_inode(devpts_mnt->mnt_sb);
|
||||
|
||||
/* We're supposed to be given the slave end of a pty */
|
||||
BUG_ON(driver->type != TTY_DRIVER_TYPE_PTY);
|
||||
BUG_ON(driver->subtype != PTY_TYPE_SLAVE);
|
||||
|
||||
if (!inode)
|
||||
return -ENOMEM;
|
||||
|
||||
inode->i_ino = number+2;
|
||||
inode->i_blksize = 1024;
|
||||
inode->i_uid = config.setuid ? config.uid : current->fsuid;
|
||||
inode->i_gid = config.setgid ? config.gid : current->fsgid;
|
||||
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
||||
init_special_inode(inode, S_IFCHR|config.mode, device);
|
||||
inode->i_op = &devpts_file_inode_operations;
|
||||
inode->u.generic_ip = tty;
|
||||
|
||||
dentry = get_node(number);
|
||||
if (!IS_ERR(dentry) && !dentry->d_inode)
|
||||
d_instantiate(dentry, inode);
|
||||
|
||||
up(&devpts_root->d_inode->i_sem);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct tty_struct *devpts_get_tty(int number)
|
||||
{
|
||||
struct dentry *dentry = get_node(number);
|
||||
struct tty_struct *tty;
|
||||
|
||||
tty = NULL;
|
||||
if (!IS_ERR(dentry)) {
|
||||
if (dentry->d_inode)
|
||||
tty = dentry->d_inode->u.generic_ip;
|
||||
dput(dentry);
|
||||
}
|
||||
|
||||
up(&devpts_root->d_inode->i_sem);
|
||||
|
||||
return tty;
|
||||
}
|
||||
|
||||
void devpts_pty_kill(int number)
|
||||
{
|
||||
struct dentry *dentry = get_node(number);
|
||||
|
||||
if (!IS_ERR(dentry)) {
|
||||
struct inode *inode = dentry->d_inode;
|
||||
if (inode) {
|
||||
inode->i_nlink--;
|
||||
d_delete(dentry);
|
||||
dput(dentry);
|
||||
}
|
||||
dput(dentry);
|
||||
}
|
||||
up(&devpts_root->d_inode->i_sem);
|
||||
}
|
||||
|
||||
static int __init init_devpts_fs(void)
|
||||
{
|
||||
int err = register_filesystem(&devpts_fs_type);
|
||||
if (!err) {
|
||||
devpts_mnt = kern_mount(&devpts_fs_type);
|
||||
if (IS_ERR(devpts_mnt))
|
||||
err = PTR_ERR(devpts_mnt);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit exit_devpts_fs(void)
|
||||
{
|
||||
unregister_filesystem(&devpts_fs_type);
|
||||
mntput(devpts_mnt);
|
||||
}
|
||||
|
||||
module_init(init_devpts_fs)
|
||||
module_exit(exit_devpts_fs)
|
||||
MODULE_LICENSE("GPL");
|
||||
Reference in New Issue
Block a user