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btrfs: remove delayed_ref_node from ref_head

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This is just excessive information in the ref_head, and makes the code
complicated.  It is a relic from when we had the heads and the refs in
the same tree, which is no longer the case.  With this removal I've
cleaned up a bunch of the cruft around this old assumption as well.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik
2017-09-29 15:43:57 -04:00
committed by David Sterba
parent c1103f7a5d
commit d278850eff
6 changed files with 120 additions and 176 deletions
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126
fs/btrfs/delayed-ref.c
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@@ -96,15 +96,15 @@ static struct btrfs_delayed_ref_head *htree_insert(struct rb_root *root,
u64 bytenr;
ins = rb_entry(node, struct btrfs_delayed_ref_head, href_node);
bytenr = ins->node.bytenr;
bytenr = ins->bytenr;
while (*p) {
parent_node = *p;
entry = rb_entry(parent_node, struct btrfs_delayed_ref_head,
href_node);
if (bytenr < entry->node.bytenr)
if (bytenr < entry->bytenr)
p = &(*p)->rb_left;
else if (bytenr > entry->node.bytenr)
else if (bytenr > entry->bytenr)
p = &(*p)->rb_right;
else
return entry;
@@ -133,15 +133,15 @@ find_ref_head(struct rb_root *root, u64 bytenr,
while (n) {
entry = rb_entry(n, struct btrfs_delayed_ref_head, href_node);
if (bytenr < entry->node.bytenr)
if (bytenr < entry->bytenr)
n = n->rb_left;
else if (bytenr > entry->node.bytenr)
else if (bytenr > entry->bytenr)
n = n->rb_right;
else
return entry;
}
if (entry && return_bigger) {
if (bytenr > entry->node.bytenr) {
if (bytenr > entry->bytenr) {
n = rb_next(&entry->href_node);
if (!n)
n = rb_first(root);
@@ -164,17 +164,17 @@ int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
if (mutex_trylock(&head->mutex))
return 0;
refcount_inc(&head->node.refs);
refcount_inc(&head->refs);
spin_unlock(&delayed_refs->lock);
mutex_lock(&head->mutex);
spin_lock(&delayed_refs->lock);
if (!head->node.in_tree) {
if (RB_EMPTY_NODE(&head->href_node)) {
mutex_unlock(&head->mutex);
btrfs_put_delayed_ref(&head->node);
btrfs_put_delayed_ref_head(head);
return -EAGAIN;
}
btrfs_put_delayed_ref(&head->node);
btrfs_put_delayed_ref_head(head);
return 0;
}
@@ -183,15 +183,10 @@ static inline void drop_delayed_ref(struct btrfs_trans_handle *trans,
struct btrfs_delayed_ref_head *head,
struct btrfs_delayed_ref_node *ref)
{
if (btrfs_delayed_ref_is_head(ref)) {
head = btrfs_delayed_node_to_head(ref);
rb_erase(&head->href_node, &delayed_refs->href_root);
} else {
assert_spin_locked(&head->lock);
list_del(&ref->list);
if (!list_empty(&ref->add_list))
list_del(&ref->add_list);
}
assert_spin_locked(&head->lock);
list_del(&ref->list);
if (!list_empty(&ref->add_list))
list_del(&ref->add_list);
ref->in_tree = 0;
btrfs_put_delayed_ref(ref);
atomic_dec(&delayed_refs->num_entries);
@@ -380,8 +375,8 @@ again:
head->processing = 1;
WARN_ON(delayed_refs->num_heads_ready == 0);
delayed_refs->num_heads_ready--;
delayed_refs->run_delayed_start = head->node.bytenr +
head->node.num_bytes;
delayed_refs->run_delayed_start = head->bytenr +
head->num_bytes;
return head;
}
@@ -469,20 +464,16 @@ add_tail:
*/
static noinline void
update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
struct btrfs_delayed_ref_node *existing,
struct btrfs_delayed_ref_node *update,
struct btrfs_delayed_ref_head *existing,
struct btrfs_delayed_ref_head *update,
int *old_ref_mod_ret)
{
struct btrfs_delayed_ref_head *existing_ref;
struct btrfs_delayed_ref_head *ref;
int old_ref_mod;
existing_ref = btrfs_delayed_node_to_head(existing);
ref = btrfs_delayed_node_to_head(update);
BUG_ON(existing_ref->is_data != ref->is_data);
BUG_ON(existing->is_data != update->is_data);
spin_lock(&existing_ref->lock);
if (ref->must_insert_reserved) {
spin_lock(&existing->lock);
if (update->must_insert_reserved) {
/* if the extent was freed and then
* reallocated before the delayed ref
* entries were processed, we can end up
@@ -490,7 +481,7 @@ update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
* the must_insert_reserved flag set.
* Set it again here
*/
existing_ref->must_insert_reserved = ref->must_insert_reserved;
existing->must_insert_reserved = update->must_insert_reserved;
/*
* update the num_bytes so we make sure the accounting
@@ -500,22 +491,22 @@ update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
}
if (ref->extent_op) {
if (!existing_ref->extent_op) {
existing_ref->extent_op = ref->extent_op;
if (update->extent_op) {
if (!existing->extent_op) {
existing->extent_op = update->extent_op;
} else {
if (ref->extent_op->update_key) {
memcpy(&existing_ref->extent_op->key,
&ref->extent_op->key,
sizeof(ref->extent_op->key));
existing_ref->extent_op->update_key = true;
if (update->extent_op->update_key) {
memcpy(&existing->extent_op->key,
&update->extent_op->key,
sizeof(update->extent_op->key));
existing->extent_op->update_key = true;
}
if (ref->extent_op->update_flags) {
existing_ref->extent_op->flags_to_set |=
ref->extent_op->flags_to_set;
existing_ref->extent_op->update_flags = true;
if (update->extent_op->update_flags) {
existing->extent_op->flags_to_set |=
update->extent_op->flags_to_set;
existing->extent_op->update_flags = true;
}
btrfs_free_delayed_extent_op(ref->extent_op);
btrfs_free_delayed_extent_op(update->extent_op);
}
}
/*
@@ -523,23 +514,23 @@ update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
* only need the lock for this case cause we could be processing it
* currently, for refs we just added we know we're a-ok.
*/
old_ref_mod = existing_ref->total_ref_mod;
old_ref_mod = existing->total_ref_mod;
if (old_ref_mod_ret)
*old_ref_mod_ret = old_ref_mod;
existing->ref_mod += update->ref_mod;
existing_ref->total_ref_mod += update->ref_mod;
existing->total_ref_mod += update->ref_mod;
/*
* If we are going to from a positive ref mod to a negative or vice
* versa we need to make sure to adjust pending_csums accordingly.
*/
if (existing_ref->is_data) {
if (existing_ref->total_ref_mod >= 0 && old_ref_mod < 0)
if (existing->is_data) {
if (existing->total_ref_mod >= 0 && old_ref_mod < 0)
delayed_refs->pending_csums -= existing->num_bytes;
if (existing_ref->total_ref_mod < 0 && old_ref_mod >= 0)
if (existing->total_ref_mod < 0 && old_ref_mod >= 0)
delayed_refs->pending_csums += existing->num_bytes;
}
spin_unlock(&existing_ref->lock);
spin_unlock(&existing->lock);
}
/*
@@ -550,14 +541,13 @@ update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
static noinline struct btrfs_delayed_ref_head *
add_delayed_ref_head(struct btrfs_fs_info *fs_info,
struct btrfs_trans_handle *trans,
struct btrfs_delayed_ref_node *ref,
struct btrfs_delayed_ref_head *head_ref,
struct btrfs_qgroup_extent_record *qrecord,
u64 bytenr, u64 num_bytes, u64 ref_root, u64 reserved,
int action, int is_data, int *qrecord_inserted_ret,
int *old_ref_mod, int *new_ref_mod)
{
struct btrfs_delayed_ref_head *existing;
struct btrfs_delayed_ref_head *head_ref = NULL;
struct btrfs_delayed_ref_root *delayed_refs;
int count_mod = 1;
int must_insert_reserved = 0;
@@ -593,26 +583,21 @@ add_delayed_ref_head(struct btrfs_fs_info *fs_info,
delayed_refs = &trans->transaction->delayed_refs;
/* first set the basic ref node struct up */
refcount_set(&ref->refs, 1);
ref->bytenr = bytenr;
ref->num_bytes = num_bytes;
ref->ref_mod = count_mod;
ref->type = 0;
ref->action = 0;
ref->is_head = 1;
ref->in_tree = 1;
ref->seq = 0;
head_ref = btrfs_delayed_node_to_head(ref);
refcount_set(&head_ref->refs, 1);
head_ref->bytenr = bytenr;
head_ref->num_bytes = num_bytes;
head_ref->ref_mod = count_mod;
head_ref->must_insert_reserved = must_insert_reserved;
head_ref->is_data = is_data;
INIT_LIST_HEAD(&head_ref->ref_list);
INIT_LIST_HEAD(&head_ref->ref_add_list);
RB_CLEAR_NODE(&head_ref->href_node);
head_ref->processing = 0;
head_ref->total_ref_mod = count_mod;
head_ref->qgroup_reserved = 0;
head_ref->qgroup_ref_root = 0;
spin_lock_init(&head_ref->lock);
mutex_init(&head_ref->mutex);
/* Record qgroup extent info if provided */
if (qrecord) {
@@ -632,17 +617,14 @@ add_delayed_ref_head(struct btrfs_fs_info *fs_info,
qrecord_inserted = 1;
}
spin_lock_init(&head_ref->lock);
mutex_init(&head_ref->mutex);
trace_add_delayed_ref_head(fs_info, ref, head_ref, action);
trace_add_delayed_ref_head(fs_info, head_ref, action);
existing = htree_insert(&delayed_refs->href_root,
&head_ref->href_node);
if (existing) {
WARN_ON(ref_root && reserved && existing->qgroup_ref_root
&& existing->qgroup_reserved);
update_existing_head_ref(delayed_refs, &existing->node, ref,
update_existing_head_ref(delayed_refs, existing, head_ref,
old_ref_mod);
/*
* we've updated the existing ref, free the newly
@@ -821,7 +803,7 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
* insert both the head node and the new ref without dropping
* the spin lock
*/
head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
head_ref = add_delayed_ref_head(fs_info, trans, head_ref, record,
bytenr, num_bytes, 0, 0, action, 0,
&qrecord_inserted, old_ref_mod,
new_ref_mod);
@@ -888,7 +870,7 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
* insert both the head node and the new ref without dropping
* the spin lock
*/
head_ref = add_delayed_ref_head(fs_info, trans, &head_ref->node, record,
head_ref = add_delayed_ref_head(fs_info, trans, head_ref, record,
bytenr, num_bytes, ref_root, reserved,
action, 1, &qrecord_inserted,
old_ref_mod, new_ref_mod);
@@ -920,7 +902,7 @@ int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
delayed_refs = &trans->transaction->delayed_refs;
spin_lock(&delayed_refs->lock);
add_delayed_ref_head(fs_info, trans, &head_ref->node, NULL, bytenr,
add_delayed_ref_head(fs_info, trans, head_ref, NULL, bytenr,
num_bytes, 0, 0, BTRFS_UPDATE_DELAYED_HEAD,
extent_op->is_data, NULL, NULL, NULL);