libfs: make simple_read_from_buffer conventional
authorSteven Rostedt <rostedt@goodmis.org>
Fri, 18 Sep 2009 20:05:42 +0000 (13:05 -0700)
committerAl Viro <viro@zeniv.linux.org.uk>
Thu, 24 Sep 2009 11:47:22 +0000 (07:47 -0400)
commit14be27460e4722d7135de3c46d043b4fc4382247
treed7026e0e43c1f048f2a0f31a54beb93b91b5fb89
parent94a8d5caba74211ec76dac80fc6e2d5c391530df
libfs: make simple_read_from_buffer conventional

Impact: have simple_read_from_buffer conform to standards

It was brought to my attention by Andrew Morton, Theodore Tso, and H.
Peter Anvin that a read from userspace should only return -EFAULT if
nothing was actually read.

Looking at the simple_read_from_buffer I noticed that this function does
not conform to that rule.  This patch fixes that function.

[akpm@linux-foundation.org: simplification suggested by hpa]
[hpa@zytor.com: fix count==0 handling]
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
fs/libfs.c