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btrfs: relocation: Cleanup while loop using rbtree_postorder_for_each_entry_safe 

And add one line comment explaining what we're doing for each loop.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2018-09-21 15:20:29 +08:00 committed by David Sterba
parent 3628b4ca64
commit 98ff7b94e4
1 changed files with 8 additions and 15 deletions
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23
fs/btrfs/relocation.c
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@ -2991,7 +2991,7 @@ int relocate_tree_blocks(struct btrfs_trans_handle *trans,
struct backref_node *node;
struct btrfs_path *path;
struct tree_block *block;
struct rb_node *rb_node;
struct tree_block *next;
int ret;
int err = 0;
@ -3001,29 +3001,23 @@ int relocate_tree_blocks(struct btrfs_trans_handle *trans,
goto out_free_blocks;
}
rb_node = rb_first(blocks);
while (rb_node) {
block = rb_entry(rb_node, struct tree_block, rb_node);
/* Kick in readahead for tree blocks with missing keys */
rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) {
if (!block->key_ready)
readahead_tree_block(fs_info, block->bytenr);
rb_node = rb_next(rb_node);
}
rb_node = rb_first(blocks);
while (rb_node) {
block = rb_entry(rb_node, struct tree_block, rb_node);
/* Get first keys */
rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) {
if (!block->key_ready) {
err = get_tree_block_key(fs_info, block);
if (err)
goto out_free_path;
}
rb_node = rb_next(rb_node);
}
rb_node = rb_first(blocks);
while (rb_node) {
block = rb_entry(rb_node, struct tree_block, rb_node);
/* Do tree relocation */
rbtree_postorder_for_each_entry_safe(block, next, blocks, rb_node) {
node = build_backref_tree(rc, &block->key,
block->level, block->bytenr);
if (IS_ERR(node)) {
@ -3034,11 +3028,10 @@ int relocate_tree_blocks(struct btrfs_trans_handle *trans,
ret = relocate_tree_block(trans, rc, node, &block->key,
path);
if (ret < 0) {
if (ret != -EAGAIN || rb_node == rb_first(blocks))
if (ret != -EAGAIN || &block->rb_node == rb_first(blocks))
err = ret;
goto out;
}
rb_node = rb_next(rb_node);
}
out:
err = finish_pending_nodes(trans, rc, path, err);