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authorEric Sandeen <sandeen@redhat.com>2009-08-17 23:55:24 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-08-17 23:55:24 -0400
commit38877f4e8dbbec12c6fde85ee1fce1dc27ef3290 (patch)
treec7cab3a9c5f5bc53f0ba7df269a630b0018dac8a /fs
parent0373130d5bc783751c1fbad948886916a21d4559 (diff)
simplify some logic in ext4_mb_normalize_request
While reading through some of the mballoc code it seems that a couple spots in the size normalization function could be streamlined. The test for non-overlapping PAs can be or'd for the start & end conditions, and the tests for adjacent PAs can be else-if'd - it's essentially independently testing: if (A + B <= C) ... if (A > C) ... These cannot both be true so it seems like the else-if might be slightly more efficient and/or informative. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/mballoc.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 833d8723688..1a9cd7de04d 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3184,23 +3184,18 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
BUG_ON(!(ac->ac_o_ex.fe_logical >= pa_end ||
ac->ac_o_ex.fe_logical < pa->pa_lstart));
- /* skip PA normalized request doesn't overlap with */
- if (pa->pa_lstart >= end) {
- spin_unlock(&pa->pa_lock);
- continue;
- }
- if (pa_end <= start) {
+ /* skip PAs this normalized request doesn't overlap with */
+ if (pa->pa_lstart >= end || pa_end <= start) {
spin_unlock(&pa->pa_lock);
continue;
}
BUG_ON(pa->pa_lstart <= start && pa_end >= end);
+ /* adjust start or end to be adjacent to this pa */
if (pa_end <= ac->ac_o_ex.fe_logical) {
BUG_ON(pa_end < start);
start = pa_end;
- }
-
- if (pa->pa_lstart > ac->ac_o_ex.fe_logical) {
+ } else if (pa->pa_lstart > ac->ac_o_ex.fe_logical) {
BUG_ON(pa->pa_lstart > end);
end = pa->pa_lstart;
}