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Btrfs: cleanup the code of used_block_group in find_free_extent()

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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>
This commit is contained in:
Miao Xie 2014-01-15 20:00:56 +08:00 committed by Chris Mason
parent 920e4a58d2
commit 215a63d139
1 changed files with 13 additions and 20 deletions
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33
fs/btrfs/extent-tree.c
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@ -6159,7 +6159,6 @@ static noinline int find_free_extent(struct btrfs_root *orig_root,
struct btrfs_root *root = orig_root->fs_info->extent_root;
struct btrfs_free_cluster *last_ptr = NULL;
struct btrfs_block_group_cache *block_group = NULL;
struct btrfs_block_group_cache *used_block_group;
u64 search_start = 0;
u64 max_extent_size = 0;
int empty_cluster = 2 * 1024 * 1024;
@ -6220,7 +6219,6 @@ static noinline int find_free_extent(struct btrfs_root *orig_root,
if (search_start == hint_byte) {
block_group = btrfs_lookup_block_group(root->fs_info,
search_start);
used_block_group = block_group;
/*
* we don't want to use the block group if it doesn't match our
* allocation bits, or if its not cached.
@ -6257,7 +6255,6 @@ search:
u64 offset;
int cached;
used_block_group = block_group;
btrfs_get_block_group(block_group);
search_start = block_group->key.objectid;
@ -6300,6 +6297,7 @@ have_block_group:
* lets look there
*/
if (last_ptr) {
struct btrfs_block_group_cache *used_block_group;
unsigned long aligned_cluster;
/*
* the refill lock keeps out other
@ -6310,10 +6308,8 @@ have_block_group:
if (used_block_group != block_group &&
(!used_block_group ||
used_block_group->ro ||
!block_group_bits(used_block_group, flags))) {
used_block_group = block_group;
!block_group_bits(used_block_group, flags)))
goto refill_cluster;
}
if (used_block_group != block_group)
btrfs_get_block_group(used_block_group);
@ -6328,16 +6324,17 @@ have_block_group:
spin_unlock(&last_ptr->refill_lock);
trace_btrfs_reserve_extent_cluster(root,
block_group, search_start, num_bytes);
if (used_block_group != block_group) {
btrfs_put_block_group(block_group);
block_group = used_block_group;
}
goto checks;
}
WARN_ON(last_ptr->block_group != used_block_group);
if (used_block_group != block_group) {
if (used_block_group != block_group)
btrfs_put_block_group(used_block_group);
used_block_group = block_group;
}
refill_cluster:
BUG_ON(used_block_group != block_group);
/* If we are on LOOP_NO_EMPTY_SIZE, we can't
* set up a new clusters, so lets just skip it
* and let the allocator find whatever block
@ -6456,25 +6453,25 @@ unclustered_alloc:
goto loop;
}
checks:
search_start = stripe_align(root, used_block_group,
search_start = stripe_align(root, block_group,
offset, num_bytes);
/* move on to the next group */
if (search_start + num_bytes >
used_block_group->key.objectid + used_block_group->key.offset) {
btrfs_add_free_space(used_block_group, offset, num_bytes);
block_group->key.objectid + block_group->key.offset) {
btrfs_add_free_space(block_group, offset, num_bytes);
goto loop;
}
if (offset < search_start)
btrfs_add_free_space(used_block_group, offset,
btrfs_add_free_space(block_group, offset,
search_start - offset);
BUG_ON(offset > search_start);
ret = btrfs_update_reserved_bytes(used_block_group, num_bytes,
ret = btrfs_update_reserved_bytes(block_group, num_bytes,
alloc_type);
if (ret == -EAGAIN) {
btrfs_add_free_space(used_block_group, offset, num_bytes);
btrfs_add_free_space(block_group, offset, num_bytes);
goto loop;
}
@ -6484,16 +6481,12 @@ checks:
trace_btrfs_reserve_extent(orig_root, block_group,
search_start, num_bytes);
if (used_block_group != block_group)
btrfs_put_block_group(used_block_group);
btrfs_put_block_group(block_group);
break;
loop:
failed_cluster_refill = false;
failed_alloc = false;
BUG_ON(index != get_block_group_index(block_group));
if (used_block_group != block_group)
btrfs_put_block_group(used_block_group);
btrfs_put_block_group(block_group);
}
up_read(&space_info->groups_sem);