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net: Allow to show socket-specific information in /proc/[pid]/fdinfo/[fd] 

This adds .show_fdinfo to socket_file_ops, so protocols will be able
to print their specific data in fdinfo.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kirill Tkhai 2019-12-09 13:03:40 +03:00 committed by David S. Miller
parent 6b8350a4b0
commit b4653342b1
2 changed files with 13 additions and 0 deletions
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1
include/linux/net.h
View File

@ -171,6 +171,7 @@ struct proto_ops {
int (*compat_getsockopt)(struct socket *sock, int level, int (*compat_getsockopt)(struct socket *sock, int level,
int optname, char __user *optval, int __user *optlen); int optname, char __user *optval, int __user *optlen);
#endif #endif
void (*show_fdinfo)(struct seq_file *m, struct socket *sock);
int (*sendmsg) (struct socket *sock, struct msghdr *m, int (*sendmsg) (struct socket *sock, struct msghdr *m,
size_t total_len); size_t total_len);
/* Notes for implementing recvmsg: /* Notes for implementing recvmsg:

12
net/socket.c
View File

@ -128,6 +128,7 @@ static ssize_t sock_sendpage(struct file *file, struct page *page,
static ssize_t sock_splice_read(struct file *file, loff_t *ppos, static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len, struct pipe_inode_info *pipe, size_t len,
unsigned int flags); unsigned int flags);
static void sock_show_fdinfo(struct seq_file *m, struct file *f);
/* /*
* Socket files have a set of 'special' operations as well as the generic file ones. These don't appear * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
@ -150,6 +151,9 @@ static const struct file_operations socket_file_ops = {
.sendpage = sock_sendpage, .sendpage = sock_sendpage,
.splice_write = generic_splice_sendpage, .splice_write = generic_splice_sendpage,
.splice_read = sock_splice_read, .splice_read = sock_splice_read,
#ifdef CONFIG_PROC_FS
.show_fdinfo = sock_show_fdinfo,
#endif
}; };
/* /*
@ -993,6 +997,14 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
return res; return res;
} }
static void sock_show_fdinfo(struct seq_file *m, struct file *f)
{
struct socket *sock = f->private_data;
if (sock->ops->show_fdinfo)
sock->ops->show_fdinfo(m, sock);
}
/* /*
* Atomic setting of ioctl hooks to avoid race * Atomic setting of ioctl hooks to avoid race
* with module unload. * with module unload.