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Btrfs: use fastpath in extent state ops as much as possible 

Fully utilize our extent state's new helper functions to use
fastpath as much as possible.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Reviewed-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Liu Bo 2012-05-10 18:10:39 +08:00 committed by Josef Bacik
parent f8c5d0b443
commit d1ac6e41d5
1 changed files with 18 additions and 26 deletions
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44
fs/btrfs/extent_io.c
View File

@ -569,10 +569,8 @@ hit_next:
if (err)
goto out;
if (state->end <= end) {
clear_state_bit(tree, state, &bits, wake);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
state = clear_state_bit(tree, state, &bits, wake);
goto next;
}
goto search_again;
}
@ -780,7 +778,6 @@ hit_next:
* Just lock what we found and keep going
*/
if (state->start == start && state->end <= end) {
struct rb_node *next_node;
if (state->state & exclusive_bits) {
*failed_start = state->start;
err = -EEXIST;
@ -788,20 +785,15 @@ hit_next:
}
set_state_bits(tree, state, &bits);
cache_state(state, cached_state);
merge_state(tree, state);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
next_node = rb_next(&state->rb_node);
if (next_node && start < end && prealloc && !need_resched()) {
state = rb_entry(next_node, struct extent_state,
rb_node);
if (state->start == start)
goto hit_next;
}
state = next_state(state);
if (start < end && state && state->start == start &&
!need_resched())
goto hit_next;
goto search_again;
}
@ -844,6 +836,10 @@ hit_next:
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
state = next_state(state);
if (start < end && state && state->start == start &&
!need_resched())
goto hit_next;
}
goto search_again;
}
@ -993,21 +989,14 @@ hit_next:
* Just lock what we found and keep going
*/
if (state->start == start && state->end <= end) {
struct rb_node *next_node;
set_state_bits(tree, state, &bits);
clear_state_bit(tree, state, &clear_bits, 0);
state = clear_state_bit(tree, state, &clear_bits, 0);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
next_node = rb_next(&state->rb_node);
if (next_node && start < end && prealloc && !need_resched()) {
state = rb_entry(next_node, struct extent_state,
rb_node);
if (state->start == start)
goto hit_next;
}
if (start < end && state && state->start == start &&
!need_resched())
goto hit_next;
goto search_again;
}
@ -1041,10 +1030,13 @@ hit_next:
goto out;
if (state->end <= end) {
set_state_bits(tree, state, &bits);
clear_state_bit(tree, state, &clear_bits, 0);
state = clear_state_bit(tree, state, &clear_bits, 0);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
if (start < end && state && state->start == start &&
!need_resched())
goto hit_next;
}
goto search_again;
}