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.

[[email protected]: simplification suggested by hpa]
[[email protected]: fix count==0 handling]
Signed-off-by: Steven Rostedt <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Al Viro <[email protected]>

0 files changed, 0 insertions, 0 deletions