Hello Dave, all,
Please consider the patch below which makes use of file->private_data to
store the pointer to the socket, which avoids touching several unused
cachelines in the dentry and inode in sockfd_lookup.
diff -purN 00_v2.6.13-rc6/net/socket.c 01_net_file/net/socket.c
--- 00_v2.6.13-rc6/net/socket.c 2005-08-04 15:56:11.000000000 -0400
+++ 01_net_file/net/socket.c 2005-08-10 11:13:18.000000000 -0400
@@ -404,6 +404,7 @@ int sock_map_fd(struct socket *sock)
file->f_mode = FMODE_READ | FMODE_WRITE;
file->f_flags = O_RDWR;
file->f_pos = 0;
+ file->private_data = sock;
fd_install(fd, file);
}
@@ -436,6 +437,9 @@ struct socket *sockfd_lookup(int fd, int
return NULL;
}
+ if (file->f_op == &socket_file_ops)
+ return file->private_data; /* set in sock_map_fd */
+
inode = file->f_dentry->d_inode;
if (!S_ISSOCK(inode->i_mode)) {
*err = -ENOTSOCK;
-
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