linux-kernel - Re: ecryptfs log spew from EINTR

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Message-ID: <20140305175316.GA20812@boyd>
Date:	Wed, 5 Mar 2014 11:53:16 -0600
From:	Tyler Hicks <tyhicks@...onical.com>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	ecryptfs@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: ecryptfs log spew from EINTR

On 2014-03-05 09:15:28, Dave Hansen wrote:
> I have a little program that uses mmap() to copy files.  Essentially:
> 
> 	addr1 = mmap(fd1);
> 	addr2 = mmap(fd2);
> 	memcpy(addr1, addr2, len);
> 
> If these files are on ecryptfs and I interrupt the memcpy() with ^C, I
> consistently get this in dmesg:
> 
> ecryptfs_decrypt_page: Error attempting to read lower page; rc = [-4]
> ecryptfs_readpage: Error decrypting page; rc = [-4]
> 
> -4 is, of course -EINTR because of the ^C.  Should we be suppressing the
> message when we see EINTR?

Yes. In fact, eCryptfs shouldn't print a KERN_ERR message at all in this
situation. KERN_DEBUG at most. eCryptfs is too chatty in many cases.

I'd like to switch over to the pr_* functions and downgrade many log
messages to pr_debug() at that time.

Tyler

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