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btrfs: use next_state/prev_state in merge_state

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We use rb_next/rb_prev and then get the entry for the adjacent items in
an extent io tree.  We have helpers for this, so convert merge_state to
use next_state/prev_state and simplify the code.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2022-09-09 17:53:37 -04:00 • committed by David Sterba
parent 43b068cad5
commit e63b81aef2
1 changed files with 20 additions and 29 deletions
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49
fs/btrfs/extent-io-tree.c
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@ -340,40 +340,31 @@ static void extent_io_tree_panic(struct extent_io_tree *tree, int err)
static void merge_state(struct extent_io_tree *tree, struct extent_state *state)
{
struct extent_state *other;
struct rb_node *other_node;
if (state->state & (EXTENT_LOCKED | EXTENT_BOUNDARY))
return;
other_node = rb_prev(&state->rb_node);
if (other_node) {
other = rb_entry(other_node, struct extent_state, rb_node);
if (other->end == state->start - 1 &&
other->state == state->state) {
if (tree->private_data &&
is_data_inode(tree->private_data))
btrfs_merge_delalloc_extent(tree->private_data,
state, other);
state->start = other->start;
rb_erase(&other->rb_node, &tree->state);
RB_CLEAR_NODE(&other->rb_node);
free_extent_state(other);
}
other = prev_state(state);
if (other && other->end == state->start - 1 &&
other->state == state->state) {
if (tree->private_data && is_data_inode(tree->private_data))
btrfs_merge_delalloc_extent(tree->private_data,
state, other);
state->start = other->start;
rb_erase(&other->rb_node, &tree->state);
RB_CLEAR_NODE(&other->rb_node);
free_extent_state(other);
}
other_node = rb_next(&state->rb_node);
if (other_node) {
other = rb_entry(other_node, struct extent_state, rb_node);
if (other->start == state->end + 1 &&
other->state == state->state) {
if (tree->private_data &&
is_data_inode(tree->private_data))
btrfs_merge_delalloc_extent(tree->private_data,
state, other);
state->end = other->end;
rb_erase(&other->rb_node, &tree->state);
RB_CLEAR_NODE(&other->rb_node);
free_extent_state(other);
}
other = next_state(state);
if (other && other->start == state->end + 1 &&
other->state == state->state) {
if (tree->private_data && is_data_inode(tree->private_data))
btrfs_merge_delalloc_extent(tree->private_data, state,
other);
state->end = other->end;
rb_erase(&other->rb_node, &tree->state);
RB_CLEAR_NODE(&other->rb_node);
free_extent_state(other);
}
}