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[NET]: cleanup sock_from_file() 

I believe dead code from sock_from_file() can be cleaned up.

All sockets are now built using sock_attach_fd(), that puts the 'sock' pointer 
into file->private_data and &socket_file_ops into file->f_op

I could not find a place where file->private_data could be set to NULL, 
keeping opened the file.

So to get 'sock' from a 'file' pointer, either :

- This is a socket file (f_op == &socket_file_ops), and we can directly get 
'sock' from private_data.
- This is not a socket, we return -ENOTSOCK and dont even try to find a socket 
via dentry/inode :)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2007-02-08 14:59:57 -08:00 committed by David S. Miller
parent dbca9b2750
commit 23bb80d215
1 changed files with 2 additions and 15 deletions
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13
net/socket.c
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@ -407,26 +407,13 @@ int sock_map_fd(struct socket *sock)
static struct socket *sock_from_file(struct file *file, int *err) static struct socket *sock_from_file(struct file *file, int *err)
{ {
struct inode *inode;
struct socket *sock;
if (file->f_op == &socket_file_ops) if (file->f_op == &socket_file_ops)
return file->private_data; /* set in sock_map_fd */ return file->private_data; /* set in sock_map_fd */
inode = file->f_path.dentry->d_inode;
if (!S_ISSOCK(inode->i_mode)) {
*err = -ENOTSOCK; *err = -ENOTSOCK;
return NULL; return NULL;
} }
sock = SOCKET_I(inode);
if (sock->file != file) {
printk(KERN_ERR "socki_lookup: socket file changed!\n");
sock->file = file;
}
return sock;
}
/** /**
* sockfd_lookup - Go from a file number to its socket slot * sockfd_lookup - Go from a file number to its socket slot
* @fd: file handle * @fd: file handle