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From: David Laight <David.Laight@ACULAB.COM>
To: 'Josef Bacik' <josef@toxicpanda.com>,
	Al Viro <viro@zeniv.linux.org.uk>, Christoph Hellwig <hch@lst.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"kernel-team@fb.com" <kernel-team@fb.com>,
	"willy@infradead.org" <willy@infradead.org>
Subject: RE: [PATCH][v2] proc: use vmalloc for our kernel buffer
Date: Thu, 13 Aug 2020 21:10:43 +0000	[thread overview]
Message-ID: <3612878ce143427b89a70de3abfb657d@AcuMS.aculab.com> (raw)
In-Reply-To: <9e4d3860-5829-df6f-aad4-44d07c62535b@toxicpanda.com>

From: Josef Bacik
> Sent: 13 August 2020 18:19
...
> We wouldn't even need the extra +1 part, since we're only copying in how much
> the user wants anyway, we could just go ahead and convert this to
> 
> left -= snprintf(buffer, left, "0x%04x\n", *(unsigned int *) table->data);
> 
> and be fine, right?  Or am I misunderstanding what you're looking for?  Thanks,

Doesn't that need to be scnprintf()?
IIRC snprintf() returns the number of bytes that would have been
written were the buffer infinite size?
(I suspect this is an 'accidental' return value from the original
SYSV? userspace implementation that just dumped characters that
wouldn't fit in the buffer somewhere.)

	David

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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

  parent reply	other threads:[~2020-08-13 21:10 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-13 14:53 [PATCH] " Josef Bacik
2020-08-13 14:59 ` Matthew Wilcox
2020-08-13 15:08   ` Josef Bacik
2020-08-13 15:33 ` [PATCH][v2] " Josef Bacik
2020-08-13 15:37   ` Christoph Hellwig
2020-08-13 15:40     ` Josef Bacik
2020-08-13 15:41       ` Christoph Hellwig
2020-08-13 16:20         ` Al Viro
2020-08-13 17:19           ` Josef Bacik
2020-08-13 17:31             ` Al Viro
2020-08-13 17:36               ` Josef Bacik
2020-08-13 21:10             ` David Laight [this message]
2020-08-13 21:31               ` Josef Bacik
2020-08-13 16:19 ` [PATCH] " David Laight
2020-08-13 16:21   ` Al Viro
2020-08-13 17:08   ` Josef Bacik

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