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btrfs: Simplify alloc_reserved_tree_block interface 

This function currently takes 7 parameters, most of which are proxies
for values from btrfs_delayed_ref_node struct which is not passed. This
patch simplifies the interface of the function by simply passing said
delayed ref node struct to the function. This enables us to:

1. Move locals variables and init code related to them from
   run_delayed_tree_ref which should only be used inside
   alloc_reserved_tree_block, such as skinny_metadata and the btrfs_key,
   representing the extent being inserted. This removes the need for the
   "ins" argument. Instead, it's replaced by a local var with a more
   verbose name - extent_key.

2. Now that we have a reference to the node in alloc_reserved_tree_block
   the delayed_tree_ref struct can be referenced inside the function and
   this enable removing the "ref->level", "parent" and "ref_root"
   arguments.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-05-21 12:27:21 +03:00 committed by David Sterba
parent 9dcdbe0144
commit 4e6bd4e0aa
1 changed files with 39 additions and 32 deletions
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71
fs/btrfs/extent-tree.c
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@ -66,9 +66,8 @@ static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
u64 flags, u64 owner, u64 offset,
struct btrfs_key *ins, int ref_mod);
static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
u64 parent, u64 root_objectid,
u64 flags, struct btrfs_disk_key *key,
int level, struct btrfs_key *ins);
struct btrfs_delayed_ref_node *node,
u64 flags, struct btrfs_disk_key *key);
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 flags,
int force);
@ -2430,10 +2429,8 @@ static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
{
int ret = 0;
struct btrfs_delayed_tree_ref *ref;
struct btrfs_key ins;
u64 parent = 0;
u64 ref_root = 0;
bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);
ref = btrfs_delayed_node_to_tree_ref(node);
trace_run_delayed_tree_ref(fs_info, node, ref, node->action);
@ -2442,15 +2439,6 @@ static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
parent = ref->parent;
ref_root = ref->root;
ins.objectid = node->bytenr;
if (skinny_metadata) {
ins.offset = ref->level;
ins.type = BTRFS_METADATA_ITEM_KEY;
} else {
ins.offset = node->num_bytes;
ins.type = BTRFS_EXTENT_ITEM_KEY;
}
if (node->ref_mod != 1) {
btrfs_err(fs_info,
"btree block(%llu) has %d references rather than 1: action %d ref_root %llu parent %llu",
@ -2460,10 +2448,9 @@ static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
}
if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) {
BUG_ON(!extent_op || !extent_op->update_flags);
ret = alloc_reserved_tree_block(trans, parent, ref_root,
ret = alloc_reserved_tree_block(trans, node,
extent_op->flags_to_set,
&extent_op->key,
ref->level, &ins);
&extent_op->key);
} else if (node->action == BTRFS_ADD_DELAYED_REF) {
ret = __btrfs_inc_extent_ref(trans, fs_info, node,
parent, ref_root,
@ -8144,37 +8131,57 @@ static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
}
static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
u64 parent, u64 root_objectid,
u64 flags, struct btrfs_disk_key *key,
int level, struct btrfs_key *ins)
struct btrfs_delayed_ref_node *node,
u64 flags, struct btrfs_disk_key *key)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
int ret;
struct btrfs_extent_item *extent_item;
struct btrfs_key extent_key;
struct btrfs_tree_block_info *block_info;
struct btrfs_extent_inline_ref *iref;
struct btrfs_path *path;
struct extent_buffer *leaf;
struct btrfs_delayed_tree_ref *ref;
u32 size = sizeof(*extent_item) + sizeof(*iref);
u64 num_bytes = ins->offset;
u64 num_bytes;
u64 parent;
bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);
if (!skinny_metadata)
ref = btrfs_delayed_node_to_tree_ref(node);
if (node->type == BTRFS_SHARED_BLOCK_REF_KEY)
parent = ref->parent;
else
parent = 0;
extent_key.objectid = node->bytenr;
if (skinny_metadata) {
extent_key.offset = ref->level;
extent_key.type = BTRFS_METADATA_ITEM_KEY;
num_bytes = fs_info->nodesize;
} else {
extent_key.offset = node->num_bytes;
extent_key.type = BTRFS_EXTENT_ITEM_KEY;
size += sizeof(*block_info);
num_bytes = node->num_bytes;
}
path = btrfs_alloc_path();
if (!path) {
btrfs_free_and_pin_reserved_extent(fs_info, ins->objectid,
btrfs_free_and_pin_reserved_extent(fs_info,
extent_key.objectid,
fs_info->nodesize);
return -ENOMEM;
}
path->leave_spinning = 1;
ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
ins, size);
&extent_key, size);
if (ret) {
btrfs_free_path(path);
btrfs_free_and_pin_reserved_extent(fs_info, ins->objectid,
btrfs_free_and_pin_reserved_extent(fs_info,
extent_key.objectid,
fs_info->nodesize);
return ret;
}
@ -8189,11 +8196,10 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
if (skinny_metadata) {
iref = (struct btrfs_extent_inline_ref *)(extent_item + 1);
num_bytes = fs_info->nodesize;
} else {
block_info = (struct btrfs_tree_block_info *)(extent_item + 1);
btrfs_set_tree_block_key(leaf, block_info, key);
btrfs_set_tree_block_level(leaf, block_info, level);
btrfs_set_tree_block_level(leaf, block_info, ref->level);
iref = (struct btrfs_extent_inline_ref *)(block_info + 1);
}
@ -8205,25 +8211,26 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
} else {
btrfs_set_extent_inline_ref_type(leaf, iref,
BTRFS_TREE_BLOCK_REF_KEY);
btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid);
btrfs_set_extent_inline_ref_offset(leaf, iref, ref->root);
}
btrfs_mark_buffer_dirty(leaf);
btrfs_free_path(path);
ret = remove_from_free_space_tree(trans, ins->objectid, num_bytes);
ret = remove_from_free_space_tree(trans, extent_key.objectid,
num_bytes);
if (ret)
return ret;
ret = update_block_group(trans, fs_info, ins->objectid,
ret = update_block_group(trans, fs_info, extent_key.objectid,
fs_info->nodesize, 1);
if (ret) { /* -ENOENT, logic error */
btrfs_err(fs_info, "update block group failed for %llu %llu",
ins->objectid, ins->offset);
extent_key.objectid, extent_key.offset);
BUG();
}
trace_btrfs_reserved_extent_alloc(fs_info, ins->objectid,
trace_btrfs_reserved_extent_alloc(fs_info, extent_key.objectid,
fs_info->nodesize);
return ret;
}