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authorChris Mason <chris.mason@oracle.com>2009-08-05 12:57:59 -0400
committerChris Mason <chris.mason@oracle.com>2009-09-11 13:31:03 -0400
commit40431d6c1288793a682fc6f5e5b5c9d5cac34608 (patch)
treea840fb38459476ff0aecda8369f965c344a25562 /fs
parent9042846bc7ae69cc3288d85af6bad16208d93a95 (diff)
downloadop-kernel-dev-40431d6c1288793a682fc6f5e5b5c9d5cac34608.zip
op-kernel-dev-40431d6c1288793a682fc6f5e5b5c9d5cac34608.tar.gz
Btrfs: optimize set extent bit
The Btrfs set_extent_bit call currently searches the rbtree every time it needs to find more extent_state objects to fill the requested operation. This adds a simple test with rb_next to see if the next object in the tree was adjacent to the one we just found. If so, we skip the search and just use the next object. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/extent_io.c15
-rw-r--r--fs/btrfs/file.c2
2 files changed, 13 insertions, 4 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 6826018..7e5c5a0 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -694,8 +694,8 @@ again:
BUG_ON(err == -EEXIST);
goto out;
}
-
state = rb_entry(node, struct extent_state, rb_node);
+hit_next:
last_start = state->start;
last_end = state->end;
@@ -706,6 +706,7 @@ again:
* Just lock what we found and keep going
*/
if (state->start == start && state->end <= end) {
+ struct rb_node *next_node;
set = state->state & bits;
if (set && exclusive) {
*failed_start = state->start;
@@ -716,7 +717,17 @@ again:
merge_state(tree, state);
if (last_end == (u64)-1)
goto out;
+
start = last_end + 1;
+ if (start < end && prealloc && !need_resched()) {
+ next_node = rb_next(node);
+ if (next_node) {
+ state = rb_entry(next_node, struct extent_state,
+ rb_node);
+ if (state->start == start)
+ goto hit_next;
+ }
+ }
goto search_again;
}
@@ -852,7 +863,7 @@ int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask)
{
return set_extent_bit(tree, start, end,
- EXTENT_DELALLOC | EXTENT_DIRTY,
+ EXTENT_DELALLOC | EXTENT_DIRTY | EXTENT_UPTODATE,
0, NULL, mask);
}
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 7c3cd24..a760d97 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -136,8 +136,6 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
btrfs_set_trans_block_group(trans, inode);
hint_byte = 0;
- set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
-
/* check for reserved extents on each page, we don't want
* to reset the delalloc bit on things that already have
* extents reserved.
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