Now that the initialization part and the critical section code have
been split it's a lot easier to open code add_delayed_data_ref. Do
so in the following manner:
1. The common init function is put immediately after memory-to-be-init
is allocated, followed by the specific data ref initialization.
2. The only piece of code that remains in the critical section is
insert_delayed_ref call.
3. Tracing and memory freeing code is moved outside of the critical
section.
No functional changes, just an overall shorter critical section.
Signed-off-by: Nikolay Borisov <nbori...@suse.com>
---
fs/btrfs/delayed-ref.c | 63 ++++++++++++++++++--------------------------------
1 file changed, 22 insertions(+), 41 deletions(-)
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 54bed13ac8f9..8d8a86784fd1 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -709,45 +709,6 @@ static void init_delayed_ref_common(struct btrfs_fs_info
*fs_info,
}
/*
- * helper to insert a delayed data ref into the rbtree.
- */
-static noinline void
-add_delayed_data_ref(struct btrfs_trans_handle *trans,
- struct btrfs_delayed_ref_head *head_ref,
- struct btrfs_delayed_ref_node *ref, u64 bytenr,
- u64 num_bytes, u64 parent, u64 ref_root, u64 owner,
- u64 offset, int action)
-{
- struct btrfs_delayed_data_ref *full_ref;
- struct btrfs_delayed_ref_root *delayed_refs;
- u8 ref_type;
- int ret;
-
-
- delayed_refs = &trans->transaction->delayed_refs;
- full_ref = btrfs_delayed_node_to_data_ref(ref);
- if (parent)
- ref_type = BTRFS_SHARED_DATA_REF_KEY;
- else
- ref_type = BTRFS_EXTENT_DATA_REF_KEY;
-
- init_delayed_ref_common(trans->fs_info, ref, bytenr, num_bytes,
- ref_root, action, ref_type);
- full_ref->root = ref_root;
- full_ref->parent = parent;
- full_ref->objectid = owner;
- full_ref->offset = offset;
-
- trace_add_delayed_data_ref(trans->fs_info, ref, full_ref,
- action == BTRFS_ADD_DELAYED_EXTENT ?
- BTRFS_ADD_DELAYED_REF : action);
-
- ret = insert_delayed_ref(trans, delayed_refs, head_ref, ref);
- if (ret > 0)
- kmem_cache_free(btrfs_delayed_data_ref_cachep, full_ref);
-}
-
-/*
* add a delayed tree ref. This does all of the accounting required
* to make sure the delayed ref is eventually processed before this
* transaction commits.
@@ -846,11 +807,25 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info
*fs_info,
struct btrfs_delayed_ref_root *delayed_refs;
struct btrfs_qgroup_extent_record *record = NULL;
int qrecord_inserted;
+ int ret;
+ u8 ref_type;
ref = kmem_cache_alloc(btrfs_delayed_data_ref_cachep, GFP_NOFS);
if (!ref)
return -ENOMEM;
+ if (parent)
+ ref_type = BTRFS_SHARED_DATA_REF_KEY;
+ else
+ ref_type = BTRFS_EXTENT_DATA_REF_KEY;
+ init_delayed_ref_common(fs_info, &ref->node, bytenr, num_bytes,
+ ref_root, action, ref_type);
+ ref->root = ref_root;
+ ref->parent = parent;
+ ref->objectid = owner;
+ ref->offset = offset;
+
+
head_ref = kmem_cache_alloc(btrfs_delayed_ref_head_cachep, GFP_NOFS);
if (!head_ref) {
kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
@@ -882,10 +857,16 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info
*fs_info,
action, 1, &qrecord_inserted,
old_ref_mod, new_ref_mod);
- add_delayed_data_ref(trans, head_ref, &ref->node, bytenr, num_bytes,
- parent, ref_root, owner, offset, action);
+ ret = insert_delayed_ref(trans, delayed_refs, head_ref, &ref->node);
spin_unlock(&delayed_refs->lock);
+ trace_add_delayed_data_ref(trans->fs_info, &ref->node, ref,
+ action == BTRFS_ADD_DELAYED_EXTENT ?
+ BTRFS_ADD_DELAYED_REF : action);
+ if (ret > 0)
+ kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
+
+
if (qrecord_inserted)
return btrfs_qgroup_trace_extent_post(fs_info, record);
return 0;
--
2.7.4
--
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