Btrfs: cleanup the code of used_block_group in find_free_extent()
used_block_group is just used for the space cluster which doesn't belong to the current block group, the other place needn't use it. Or the logic of code seems unclear. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
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@ -6159,7 +6159,6 @@ static noinline int find_free_extent(struct btrfs_root *orig_root,
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struct btrfs_root *root = orig_root->fs_info->extent_root;
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struct btrfs_free_cluster *last_ptr = NULL;
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struct btrfs_block_group_cache *block_group = NULL;
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struct btrfs_block_group_cache *used_block_group;
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u64 search_start = 0;
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u64 max_extent_size = 0;
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int empty_cluster = 2 * 1024 * 1024;
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@ -6220,7 +6219,6 @@ static noinline int find_free_extent(struct btrfs_root *orig_root,
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if (search_start == hint_byte) {
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block_group = btrfs_lookup_block_group(root->fs_info,
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search_start);
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used_block_group = block_group;
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/*
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* we don't want to use the block group if it doesn't match our
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* allocation bits, or if its not cached.
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@ -6257,7 +6255,6 @@ search:
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u64 offset;
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int cached;
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used_block_group = block_group;
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btrfs_get_block_group(block_group);
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search_start = block_group->key.objectid;
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@ -6300,6 +6297,7 @@ have_block_group:
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* lets look there
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*/
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if (last_ptr) {
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struct btrfs_block_group_cache *used_block_group;
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unsigned long aligned_cluster;
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/*
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* the refill lock keeps out other
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@ -6310,10 +6308,8 @@ have_block_group:
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if (used_block_group != block_group &&
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(!used_block_group ||
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used_block_group->ro ||
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!block_group_bits(used_block_group, flags))) {
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used_block_group = block_group;
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!block_group_bits(used_block_group, flags)))
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goto refill_cluster;
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}
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if (used_block_group != block_group)
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btrfs_get_block_group(used_block_group);
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@ -6328,16 +6324,17 @@ have_block_group:
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spin_unlock(&last_ptr->refill_lock);
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trace_btrfs_reserve_extent_cluster(root,
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block_group, search_start, num_bytes);
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if (used_block_group != block_group) {
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btrfs_put_block_group(block_group);
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block_group = used_block_group;
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}
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goto checks;
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}
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WARN_ON(last_ptr->block_group != used_block_group);
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if (used_block_group != block_group) {
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if (used_block_group != block_group)
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btrfs_put_block_group(used_block_group);
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used_block_group = block_group;
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}
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refill_cluster:
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BUG_ON(used_block_group != block_group);
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/* If we are on LOOP_NO_EMPTY_SIZE, we can't
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* set up a new clusters, so lets just skip it
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* and let the allocator find whatever block
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@ -6456,25 +6453,25 @@ unclustered_alloc:
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goto loop;
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}
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checks:
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search_start = stripe_align(root, used_block_group,
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search_start = stripe_align(root, block_group,
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offset, num_bytes);
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/* move on to the next group */
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if (search_start + num_bytes >
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used_block_group->key.objectid + used_block_group->key.offset) {
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btrfs_add_free_space(used_block_group, offset, num_bytes);
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block_group->key.objectid + block_group->key.offset) {
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btrfs_add_free_space(block_group, offset, num_bytes);
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goto loop;
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}
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if (offset < search_start)
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btrfs_add_free_space(used_block_group, offset,
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btrfs_add_free_space(block_group, offset,
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search_start - offset);
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BUG_ON(offset > search_start);
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ret = btrfs_update_reserved_bytes(used_block_group, num_bytes,
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ret = btrfs_update_reserved_bytes(block_group, num_bytes,
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alloc_type);
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if (ret == -EAGAIN) {
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btrfs_add_free_space(used_block_group, offset, num_bytes);
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btrfs_add_free_space(block_group, offset, num_bytes);
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goto loop;
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}
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@ -6484,16 +6481,12 @@ checks:
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trace_btrfs_reserve_extent(orig_root, block_group,
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search_start, num_bytes);
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if (used_block_group != block_group)
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btrfs_put_block_group(used_block_group);
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btrfs_put_block_group(block_group);
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break;
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loop:
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failed_cluster_refill = false;
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failed_alloc = false;
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BUG_ON(index != get_block_group_index(block_group));
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if (used_block_group != block_group)
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btrfs_put_block_group(used_block_group);
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btrfs_put_block_group(block_group);
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}
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up_read(&space_info->groups_sem);
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