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TTY: devpts, return created inode from devpts_pty_new 

The goal is to stop setting and using tty->driver_data in devpts code.
It should be used solely by the driver's code, pty in this case.

For the cleanup of layering, we will need the inode created in
devpts_pty_new to be stored into slave's driver_data. So we convert
devpts_pty_new to return the inode or an ERR_PTR-encoded error in case
of failure.

The move of 'inode = new_inode(sb);' from declarators to the code is
only cosmetical, but it makes the code easier to read.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2012-10-18 22:26:28 +02:00 committed by Greg Kroah-Hartman
parent 8fcbaa2b7f
commit 162b97cfa2
3 changed files with 15 additions and 12 deletions
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7
drivers/tty/pty.c
View File

@ -614,6 +614,7 @@ static const struct tty_operations pty_unix98_ops = {
static int ptmx_open(struct inode *inode, struct file *filp)
{
struct tty_struct *tty;
struct inode *slave_inode;
int retval;
int index;
@ -650,9 +651,11 @@ static int ptmx_open(struct inode *inode, struct file *filp)
tty_add_file(tty, filp);
retval = devpts_pty_new(inode, tty->link);
if (retval)
slave_inode = devpts_pty_new(inode, tty->link);
if (IS_ERR(slave_inode)) {
retval = PTR_ERR(slave_inode);
goto err_release;
}
retval = ptm_driver->ops->open(tty, filp);
if (retval)

12
fs/devpts/inode.c
View File

@ -545,7 +545,7 @@ void devpts_kill_index(struct inode *ptmx_inode, int idx)
mutex_unlock(&allocated_ptys_lock);
}
int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
struct inode *devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
{
/* tty layer puts index from devpts_new_index() in here */
int number = tty->index;
@ -553,19 +553,19 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
dev_t device = MKDEV(driver->major, driver->minor_start+number);
struct dentry *dentry;
struct super_block *sb = pts_sb_from_inode(ptmx_inode);
struct inode *inode = new_inode(sb);
struct inode *inode;
struct dentry *root = sb->s_root;
struct pts_fs_info *fsi = DEVPTS_SB(sb);
struct pts_mount_opts *opts = &fsi->mount_opts;
int ret = 0;
char s[12];
/* 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);
inode = new_inode(sb);
if (!inode)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
inode->i_ino = number + 3;
inode->i_uid = opts->setuid ? opts->uid : current_fsuid();
@ -585,12 +585,12 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
fsnotify_create(root->d_inode, dentry);
} else {
iput(inode);
ret = -ENOMEM;
inode = ERR_PTR(-ENOMEM);
}
mutex_unlock(&root->d_inode->i_mutex);
return ret;
return inode;
}
void *devpts_get_priv(struct inode *pts_inode)

8
include/linux/devpts_fs.h
View File

@ -20,7 +20,7 @@
int devpts_new_index(struct inode *ptmx_inode);
void devpts_kill_index(struct inode *ptmx_inode, int idx);
/* mknod in devpts */
int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty);
struct inode *devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty);
/* get private structure */
void *devpts_get_priv(struct inode *pts_inode);
/* unlink */
@ -31,10 +31,10 @@ void devpts_pty_kill(struct tty_struct *tty);
/* Dummy stubs in the no-pty case */
static inline int devpts_new_index(struct inode *ptmx_inode) { return -EINVAL; }
static inline void devpts_kill_index(struct inode *ptmx_inode, int idx) { }
static inline int devpts_pty_new(struct inode *ptmx_inode,
struct tty_struct *tty)
static inline struct inode *devpts_pty_new(struct inode *ptmx_inode,
struct tty_struct *tty)
{
return -EINVAL;
return ERR_PTR(-EINVAL);
}
static inline void *devpts_get_priv(struct inode *pts_inode)
{