idr: remove _idr_rc_to_errno() hack
authorTejun Heo <tj@kernel.org>
Thu, 28 Feb 2013 01:03:53 +0000 (17:03 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 28 Feb 2013 03:10:14 +0000 (19:10 -0800)
commit12d1b4393e0d8df36b2646a5e512f0513fb532d2
treea705b06b3d0ece29b0f34fedba87d18543ac1b80
parent49038ef4fbe2842bd4d8338f89ec5c9ba71b0ae1
idr: remove _idr_rc_to_errno() hack

idr uses -1, IDR_NEED_TO_GROW and IDR_NOMORE_SPACE to communicate
exception conditions internally.  The return value is later translated
to errno values using _idr_rc_to_errno().

This is confusing.  Drop the custom ones and consistently use -EAGAIN
for "tree needs to grow", -ENOMEM for "need more memory" and -ENOSPC for
"ran out of ID space".

Due to the weird memory preloading mechanism, [ra]_get_new*() return
-EAGAIN on memory shortage, so we need to substitute -ENOMEM w/
-EAGAIN on those interface functions.  They'll eventually be cleaned
up and the translations will go away.

This patch doesn't introduce any functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/idr.h
lib/idr.c