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btrfs: extent-tree: Refactor add_pinned_bytes() to add|sub_pinned_bytes() 

Instead of using @sign to determine whether we're adding or subtracting.
Even it only has 3 callers, it's still (and in fact already caused
problem in the past) confusing to use.

Refactor add_pinned_bytes() to add_pinned_bytes() and sub_pinned_bytes()
to explicitly show what we're doing.

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 2019-05-15 07:33:48 +08:00 committed by David Sterba
parent 6fbc7275c7
commit 78192442d3
1 changed files with 27 additions and 16 deletions
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43
fs/btrfs/extent-tree.c
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@ -756,27 +756,38 @@ static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
return NULL;
}
static void add_pinned_bytes(struct btrfs_fs_info *fs_info,
struct btrfs_ref *ref, int sign)
static u64 generic_ref_to_space_flags(struct btrfs_ref *ref)
{
struct btrfs_space_info *space_info;
s64 num_bytes;
u64 flags;
ASSERT(sign == 1 || sign == -1);
num_bytes = sign * ref->len;
if (ref->type == BTRFS_REF_METADATA) {
if (ref->tree_ref.root == BTRFS_CHUNK_TREE_OBJECTID)
flags = BTRFS_BLOCK_GROUP_SYSTEM;
return BTRFS_BLOCK_GROUP_SYSTEM;
else
flags = BTRFS_BLOCK_GROUP_METADATA;
} else {
flags = BTRFS_BLOCK_GROUP_DATA;
return BTRFS_BLOCK_GROUP_METADATA;
}
return BTRFS_BLOCK_GROUP_DATA;
}
static void add_pinned_bytes(struct btrfs_fs_info *fs_info,
struct btrfs_ref *ref)
{
struct btrfs_space_info *space_info;
u64 flags = generic_ref_to_space_flags(ref);
space_info = __find_space_info(fs_info, flags);
ASSERT(space_info);
percpu_counter_add_batch(&space_info->total_bytes_pinned, num_bytes,
percpu_counter_add_batch(&space_info->total_bytes_pinned, ref->len,
BTRFS_TOTAL_BYTES_PINNED_BATCH);
}
static void sub_pinned_bytes(struct btrfs_fs_info *fs_info,
struct btrfs_ref *ref)
{
struct btrfs_space_info *space_info;
u64 flags = generic_ref_to_space_flags(ref);
space_info = __find_space_info(fs_info, flags);
ASSERT(space_info);
percpu_counter_add_batch(&space_info->total_bytes_pinned, -ref->len,
BTRFS_TOTAL_BYTES_PINNED_BATCH);
}
@ -2065,7 +2076,7 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
btrfs_ref_tree_mod(fs_info, generic_ref);
if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0)
add_pinned_bytes(fs_info, generic_ref, -1);
sub_pinned_bytes(fs_info, generic_ref);
return ret;
}
@ -7191,7 +7202,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
}
out:
if (pin)
add_pinned_bytes(fs_info, &generic_ref, 1);
add_pinned_bytes(fs_info, &generic_ref);
if (last_ref) {
/*
@ -7239,7 +7250,7 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref)
btrfs_ref_tree_mod(fs_info, ref);
if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0)
add_pinned_bytes(fs_info, ref, 1);
add_pinned_bytes(fs_info, ref);
return ret;
}