linux-kernel - How to export information larger than PROC_BLOCK

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Message-ID: <BANLkTinQJ6wzOR++c-OSiCkf=MjOU=y=1A@mail.gmail.com>
Date:	Tue, 26 Apr 2011 20:54:07 -0400
From:	Jidong Xiao <jidong.xiao@...il.com>
To:	Kernel development list <linux-kernel@...r.kernel.org>
Subject: How to export information larger than PROC_BLOCK_SIZE via /proc file system?

Hi,

I am tracing some data inside the kernel, and I plan to export the
tracing data through /proc file system. I created a file under /proc
file system, and I use cat to display the tracing data. However, every
time there is only 3072 bytes data displayed, which is the size
defined by PROC_BLOCK_SIZE. And I wonder that how to export
information more than that limit? Judging from the function
fs/proc/generic.c/proc_file_read(), if the size returned by my
read_proc function is large than a PAGE_SIZE, then I will get a
KERN_ERR message which says "proc_file_read: Apparent buffer
overflow!". Any help would be appreciated!

Regards
Jidong
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