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btrfs: add fast path for extent_state insertion

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In two cases the exact location where to insert the extent state is
known at the call time so we don't need to pass it to insert_state that
takes the fast path.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-06-25 18:11:31 +02:00
parent 6d92b304ec
commit fb8f07d2d8
1 changed files with 16 additions and 7 deletions
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23
fs/btrfs/extent_io.c
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@ -569,6 +569,20 @@ insert_new:
return 0; return 0;
} }
/*
* Insert state to @tree to the location given by @node and @parent.
*/
static void insert_state_fast(struct extent_io_tree *tree,
struct extent_state *state, struct rb_node **node,
struct rb_node *parent, unsigned bits,
struct extent_changeset *changeset)
{
set_state_bits(tree, state, bits, changeset);
rb_link_node(&state->rb_node, parent, node);
rb_insert_color(&state->rb_node, &tree->state);
merge_state(tree, state);
}
/* /*
* split a given extent state struct in two, inserting the preallocated * split a given extent state struct in two, inserting the preallocated
* struct 'prealloc' as the newly created second half. 'split' indicates an * struct 'prealloc' as the newly created second half. 'split' indicates an
@ -1021,10 +1035,7 @@ again:
BUG_ON(!prealloc); BUG_ON(!prealloc);
prealloc->start = start; prealloc->start = start;
prealloc->end = end; prealloc->end = end;
err = insert_state(tree, prealloc, &p, &parent, bits, changeset); insert_state_fast(tree, prealloc, p, parent, bits, changeset);
if (err)
extent_io_tree_panic(tree, err);
cache_state(prealloc, cached_state); cache_state(prealloc, cached_state);
prealloc = NULL; prealloc = NULL;
goto out; goto out;
@ -1264,9 +1275,7 @@ again:
} }
prealloc->start = start; prealloc->start = start;
prealloc->end = end; prealloc->end = end;
err = insert_state(tree, prealloc, &p, &parent, bits, NULL); insert_state_fast(tree, prealloc, p, parent, bits, NULL);
if (err)
extent_io_tree_panic(tree, err);
cache_state(prealloc, cached_state); cache_state(prealloc, cached_state);
prealloc = NULL; prealloc = NULL;
goto out; goto out;