From: Jens Axboe <axboe@suse.de>
Date: Mon, 1 May 2006 17:50:48 +0000 (+0200)
Subject: [PATCH] splice: fix bugs in pipe_to_file()
X-Git-Tag: v2.6.17-rc4~63^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0568b409c74f7a125d92a09a3f386785700ef688;p=pandora-kernel.git

[PATCH] splice: fix bugs in pipe_to_file()

Found by Oleg Nesterov <oleg@tv-sign.ru>, fixed by me.

- Only allow full pages to go to the page cache.
- Check page != buf->page instead of using PIPE_BUF_FLAG_STOLEN.
- Remember to clear 'stolen' if add_to_page_cache() fails.

And as a cleanup on that:

- Make the bottom fall-through logic a little less convoluted. Also make
  the steal path hold an extra reference to the page, so we don't have
  to differentiate between stolen and non-stolen at the end.

Signed-off-by: Jens Axboe <axboe@suse.de>
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