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Subject[PATCH 13/16] show-pipesize-in-stat.diff

Show the fill status of a pipe (in bytes) when stat'ing one.

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>

fs/stat.c | 31 ++++++++++++++++++++++++++++++-
include/linux/un.h | 2 ++
include/net/af_unix.h | 3 +++
net/unix/af_unix.c | 10 ++++++++++
4 files changed, 45 insertions(+), 1 deletion(-)
Index: linux-2.6.21-rc5/fs/stat.c
===================================================================
--- linux-2.6.21-rc5.orig/fs/stat.c
+++ linux-2.6.21-rc5/fs/stat.c
@@ -14,6 +14,10 @@
#include <linux/namei.h>
#include <linux/security.h>
#include <linux/syscalls.h>
+#include <linux/blkdev.h>
+#include <linux/genhd.h>
+#include <linux/pipe_fs_i.h>
+#include <net/af_unix.h>
#include <linux/pagemap.h>

#include <asm/uaccess.h>
@@ -31,7 +35,32 @@ void generic_fillattr(struct inode *inod
stat->atime = inode->i_atime;
stat->mtime = inode->i_mtime;
stat->ctime = inode->i_ctime;
- stat->size = i_size_read(inode);
+ stat->size = 0;
+ if (S_ISFIFO(inode->i_mode)) {
+ const struct pipe_inode_info *info = inode->i_pipe;
+ int i;
+ stat->size = 0;
+ if (info != NULL) {
+ for (i = 0; i < PIPE_BUFFERS; ++i) {
+ const struct pipe_buffer *buf = &info->bufs[i];
+ if (buf != NULL && buf->page != NULL)
+ stat->size += buf->len;
+ }
+ }
+ } else if (S_ISSOCK(inode->i_mode)) {
+#ifdef CONFIG_UNIX_MODULE
+ loff_t (*uxsize)(struct inode *) = __symbol_get("unixsock_size");
+ if (uxsize != NULL) {
+ stat->size = uxsize(inode);
+ symbol_put("unixsock_size");
+ }
+#endif
+#if defined(CONFIG_UNIX) && !defined(CONFIG_UNIX_MODULE)
+ stat->size = unixsock_size(inode);
+#endif
+ } else {
+ stat->size = i_size_read(inode);
+ }
stat->blocks = inode->i_blocks;
stat->blksize = (1 << inode->i_blkbits);
}
Index: linux-2.6.21-rc5/include/linux/un.h
===================================================================
--- linux-2.6.21-rc5.orig/include/linux/un.h
+++ linux-2.6.21-rc5/include/linux/un.h
@@ -3,6 +3,8 @@

#define UNIX_PATH_MAX 108

+#include <linux/socket.h>
+
struct sockaddr_un {
sa_family_t sun_family; /* AF_UNIX */
char sun_path[UNIX_PATH_MAX]; /* pathname */
Index: linux-2.6.21-rc5/include/net/af_unix.h
===================================================================
--- linux-2.6.21-rc5.orig/include/net/af_unix.h
+++ linux-2.6.21-rc5/include/net/af_unix.h
@@ -2,6 +2,7 @@
#define __LINUX_NET_AFUNIX_H

#include <linux/socket.h>
+#include <linux/types.h>
#include <linux/un.h>
#include <linux/mutex.h>
#include <net/sock.h>
@@ -88,6 +89,8 @@ struct unix_sock {
};
#define unix_sk(__sk) ((struct unix_sock *)__sk)

+extern loff_t unixsock_size(struct inode *);
+
#ifdef CONFIG_SYSCTL
extern int sysctl_unix_max_dgram_qlen;
extern void unix_sysctl_register(void);
Index: linux-2.6.21-rc5/net/unix/af_unix.c
===================================================================
--- linux-2.6.21-rc5.orig/net/unix/af_unix.c
+++ linux-2.6.21-rc5/net/unix/af_unix.c
@@ -744,6 +744,16 @@ fail:
return NULL;
}

+loff_t unixsock_size(struct inode *inode) {
+ struct sock *sk = unix_find_socket_byinode(inode);
+ loff_t eax;
+
+ if(sk == NULL) { return 0; }
+ eax = sk->sk_rcvbuf;
+ sock_put(sk);
+ return eax;
+}
+EXPORT_SYMBOL(unixsock_size);

static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
#<EOF>
-
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