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-rw-r--r--fs/btrfs/backref.c4
-rw-r--r--fs/btrfs/delayed-ref.c126
-rw-r--r--fs/btrfs/delayed-ref.h49
-rw-r--r--fs/btrfs/disk-io.c12
-rw-r--r--fs/btrfs/extent-tree.c90
5 files changed, 114 insertions, 167 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index b517ef1477ea..33cba1abf8b6 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1178,7 +1178,7 @@ again:
head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
if (head) {
if (!mutex_trylock(&head->mutex)) {
- refcount_inc(&head->node.refs);
+ refcount_inc(&head->refs);
spin_unlock(&delayed_refs->lock);
btrfs_release_path(path);
@@ -1189,7 +1189,7 @@ again:
*/
mutex_lock(&head->mutex);
mutex_unlock(&head->mutex);
- btrfs_put_delayed_ref(&head->node);
+ btrfs_put_delayed_ref_head(head);
goto again;
}
spin_unlock(&delayed_refs->lock);
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 93ffa898df6d..b9b41c838da4 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -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);
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index ce88e4ac5276..1ce11858d727 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -26,15 +26,6 @@
#define BTRFS_ADD_DELAYED_EXTENT 3 /* record a full extent allocation */
#define BTRFS_UPDATE_DELAYED_HEAD 4 /* not changing ref count on head ref */
-/*
- * XXX: Qu: I really hate the design that ref_head and tree/data ref shares the
- * same ref_node structure.
- * Ref_head is in a higher logic level than tree/data ref, and duplicated
- * bytenr/num_bytes in ref_node is really a waste or memory, they should be
- * referred from ref_head.
- * This gets more disgusting after we use list to store tree/data ref in
- * ref_head. Must clean this mess up later.
- */
struct btrfs_delayed_ref_node {
/*data/tree ref use list, stored in ref_head->ref_list. */
struct list_head list;
@@ -91,8 +82,9 @@ struct btrfs_delayed_extent_op {
* reference count modifications we've queued up.
*/
struct btrfs_delayed_ref_head {
- struct btrfs_delayed_ref_node node;
-
+ u64 bytenr;
+ u64 num_bytes;
+ refcount_t refs;
/*
* the mutex is held while running the refs, and it is also
* held when checking the sum of reference modifications.
@@ -116,6 +108,14 @@ struct btrfs_delayed_ref_head {
int total_ref_mod;
/*
+ * This is the current outstanding mod references for this bytenr. This
+ * is used with lookup_extent_info to get an accurate reference count
+ * for a bytenr, so it is adjusted as delayed refs are run so that any
+ * on disk reference count + ref_mod is accurate.
+ */
+ int ref_mod;
+
+ /*
* For qgroup reserved space freeing.
*
* ref_root and reserved will be recorded after
@@ -234,15 +234,18 @@ static inline void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref)
case BTRFS_SHARED_DATA_REF_KEY:
kmem_cache_free(btrfs_delayed_data_ref_cachep, ref);
break;
- case 0:
- kmem_cache_free(btrfs_delayed_ref_head_cachep, ref);
- break;
default:
BUG();
}
}
}
+static inline void btrfs_put_delayed_ref_head(struct btrfs_delayed_ref_head *head)
+{
+ if (refcount_dec_and_test(&head->refs))
+ kmem_cache_free(btrfs_delayed_ref_head_cachep, head);
+}
+
int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes, u64 parent,
@@ -283,35 +286,17 @@ int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info,
u64 seq);
/*
- * a node might live in a head or a regular ref, this lets you
- * test for the proper type to use.
- */
-static int btrfs_delayed_ref_is_head(struct btrfs_delayed_ref_node *node)
-{
- return node->is_head;
-}
-
-/*
* helper functions to cast a node into its container
*/
static inline struct btrfs_delayed_tree_ref *
btrfs_delayed_node_to_tree_ref(struct btrfs_delayed_ref_node *node)
{
- WARN_ON(btrfs_delayed_ref_is_head(node));
return container_of(node, struct btrfs_delayed_tree_ref, node);
}
static inline struct btrfs_delayed_data_ref *
btrfs_delayed_node_to_data_ref(struct btrfs_delayed_ref_node *node)
{
- WARN_ON(btrfs_delayed_ref_is_head(node));
return container_of(node, struct btrfs_delayed_data_ref, node);
}
-
-static inline struct btrfs_delayed_ref_head *
-btrfs_delayed_node_to_head(struct btrfs_delayed_ref_node *node)
-{
- WARN_ON(!btrfs_delayed_ref_is_head(node));
- return container_of(node, struct btrfs_delayed_ref_head, node);
-}
#endif
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index f971d5680e6f..69ce738c00d0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4121,12 +4121,12 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
head = rb_entry(node, struct btrfs_delayed_ref_head,
href_node);
if (!mutex_trylock(&head->mutex)) {
- refcount_inc(&head->node.refs);
+ refcount_inc(&head->refs);
spin_unlock(&delayed_refs->lock);
mutex_lock(&head->mutex);
mutex_unlock(&head->mutex);
- btrfs_put_delayed_ref(&head->node);
+ btrfs_put_delayed_ref_head(head);
spin_lock(&delayed_refs->lock);
continue;
}
@@ -4147,16 +4147,16 @@ static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
if (head->processing == 0)
delayed_refs->num_heads_ready--;
atomic_dec(&delayed_refs->num_entries);
- head->node.in_tree = 0;
rb_erase(&head->href_node, &delayed_refs->href_root);
+ RB_CLEAR_NODE(&head->href_node);
spin_unlock(&head->lock);
spin_unlock(&delayed_refs->lock);
mutex_unlock(&head->mutex);
if (pin_bytes)
- btrfs_pin_extent(fs_info, head->node.bytenr,
- head->node.num_bytes, 1);
- btrfs_put_delayed_ref(&head->node);
+ btrfs_pin_extent(fs_info, head->bytenr,
+ head->num_bytes, 1);
+ btrfs_put_delayed_ref_head(head);
cond_resched();
spin_lock(&delayed_refs->lock);
}
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 628ae71094f2..423d89145bac 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -912,7 +912,7 @@ search_again:
head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
if (head) {
if (!mutex_trylock(&head->mutex)) {
- refcount_inc(&head->node.refs);
+ refcount_inc(&head->refs);
spin_unlock(&delayed_refs->lock);
btrfs_release_path(path);
@@ -923,7 +923,7 @@ search_again:
*/
mutex_lock(&head->mutex);
mutex_unlock(&head->mutex);
- btrfs_put_delayed_ref(&head->node);
+ btrfs_put_delayed_ref_head(head);
goto search_again;
}
spin_lock(&head->lock);
@@ -932,7 +932,7 @@ search_again:
else
BUG_ON(num_refs == 0);
- num_refs += head->node.ref_mod;
+ num_refs += head->ref_mod;
spin_unlock(&head->lock);
mutex_unlock(&head->mutex);
}
@@ -2337,7 +2337,7 @@ static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op,
static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
- struct btrfs_delayed_ref_node *node,
+ struct btrfs_delayed_ref_head *head,
struct btrfs_delayed_extent_op *extent_op)
{
struct btrfs_key key;
@@ -2359,14 +2359,14 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
- key.objectid = node->bytenr;
+ key.objectid = head->bytenr;
if (metadata) {
key.type = BTRFS_METADATA_ITEM_KEY;
key.offset = extent_op->level;
} else {
key.type = BTRFS_EXTENT_ITEM_KEY;
- key.offset = node->num_bytes;
+ key.offset = head->num_bytes;
}
again:
@@ -2383,17 +2383,17 @@ again:
path->slots[0]--;
btrfs_item_key_to_cpu(path->nodes[0], &key,
path->slots[0]);
- if (key.objectid == node->bytenr &&
+ if (key.objectid == head->bytenr &&
key.type == BTRFS_EXTENT_ITEM_KEY &&
- key.offset == node->num_bytes)
+ key.offset == head->num_bytes)
ret = 0;
}
if (ret > 0) {
btrfs_release_path(path);
metadata = 0;
- key.objectid = node->bytenr;
- key.offset = node->num_bytes;
+ key.objectid = head->bytenr;
+ key.offset = head->num_bytes;
key.type = BTRFS_EXTENT_ITEM_KEY;
goto again;
}
@@ -2562,7 +2562,7 @@ static int cleanup_extent_op(struct btrfs_trans_handle *trans,
return 0;
}
spin_unlock(&head->lock);
- ret = run_delayed_extent_op(trans, fs_info, &head->node, extent_op);
+ ret = run_delayed_extent_op(trans, fs_info, head, extent_op);
btrfs_free_delayed_extent_op(extent_op);
return ret ? ret : 1;
}
@@ -2597,39 +2597,37 @@ static int cleanup_ref_head(struct btrfs_trans_handle *trans,
spin_unlock(&delayed_refs->lock);
return 1;
}
- head->node.in_tree = 0;
delayed_refs->num_heads--;
rb_erase(&head->href_node, &delayed_refs->href_root);
+ RB_CLEAR_NODE(&head->href_node);
spin_unlock(&delayed_refs->lock);
spin_unlock(&head->lock);
atomic_dec(&delayed_refs->num_entries);
- trace_run_delayed_ref_head(fs_info, &head->node, head,
- head->node.action);
+ trace_run_delayed_ref_head(fs_info, head, 0);
if (head->total_ref_mod < 0) {
struct btrfs_block_group_cache *cache;
- cache = btrfs_lookup_block_group(fs_info, head->node.bytenr);
+ cache = btrfs_lookup_block_group(fs_info, head->bytenr);
ASSERT(cache);
percpu_counter_add(&cache->space_info->total_bytes_pinned,
- -head->node.num_bytes);
+ -head->num_bytes);
btrfs_put_block_group(cache);
if (head->is_data) {
spin_lock(&delayed_refs->lock);
- delayed_refs->pending_csums -= head->node.num_bytes;
+ delayed_refs->pending_csums -= head->num_bytes;
spin_unlock(&delayed_refs->lock);
}
}
if (head->must_insert_reserved) {
- btrfs_pin_extent(fs_info, head->node.bytenr,
- head->node.num_bytes, 1);
+ btrfs_pin_extent(fs_info, head->bytenr,
+ head->num_bytes, 1);
if (head->is_data) {
- ret = btrfs_del_csums(trans, fs_info,
- head->node.bytenr,
- head->node.num_bytes);
+ ret = btrfs_del_csums(trans, fs_info, head->bytenr,
+ head->num_bytes);
}
}
@@ -2637,7 +2635,7 @@ static int cleanup_ref_head(struct btrfs_trans_handle *trans,
btrfs_qgroup_free_delayed_ref(fs_info, head->qgroup_ref_root,
head->qgroup_reserved);
btrfs_delayed_ref_unlock(head);
- btrfs_put_delayed_ref(&head->node);
+ btrfs_put_delayed_ref_head(head);
return 0;
}
@@ -2751,10 +2749,10 @@ static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
switch (ref->action) {
case BTRFS_ADD_DELAYED_REF:
case BTRFS_ADD_DELAYED_EXTENT:
- locked_ref->node.ref_mod -= ref->ref_mod;
+ locked_ref->ref_mod -= ref->ref_mod;
break;
case BTRFS_DROP_DELAYED_REF:
- locked_ref->node.ref_mod += ref->ref_mod;
+ locked_ref->ref_mod += ref->ref_mod;
break;
default:
WARN_ON(1);
@@ -3087,33 +3085,16 @@ again:
spin_unlock(&delayed_refs->lock);
goto out;
}
+ head = rb_entry(node, struct btrfs_delayed_ref_head,
+ href_node);
+ refcount_inc(&head->refs);
+ spin_unlock(&delayed_refs->lock);
- while (node) {
- head = rb_entry(node, struct btrfs_delayed_ref_head,
- href_node);
- if (btrfs_delayed_ref_is_head(&head->node)) {
- struct btrfs_delayed_ref_node *ref;
-
- ref = &head->node;
- refcount_inc(&ref->refs);
-
- spin_unlock(&delayed_refs->lock);
- /*
- * Mutex was contended, block until it's
- * released and try again
- */
- mutex_lock(&head->mutex);
- mutex_unlock(&head->mutex);
+ /* Mutex was contended, block until it's released and retry. */
+ mutex_lock(&head->mutex);
+ mutex_unlock(&head->mutex);
- btrfs_put_delayed_ref(ref);
- cond_resched();
- goto again;
- } else {
- WARN_ON(1);
- }
- node = rb_next(node);
- }
- spin_unlock(&delayed_refs->lock);
+ btrfs_put_delayed_ref_head(head);
cond_resched();
goto again;
}
@@ -3171,7 +3152,7 @@ static noinline int check_delayed_ref(struct btrfs_root *root,
}
if (!mutex_trylock(&head->mutex)) {
- refcount_inc(&head->node.refs);
+ refcount_inc(&head->refs);
spin_unlock(&delayed_refs->lock);
btrfs_release_path(path);
@@ -3182,7 +3163,7 @@ static noinline int check_delayed_ref(struct btrfs_root *root,
*/
mutex_lock(&head->mutex);
mutex_unlock(&head->mutex);
- btrfs_put_delayed_ref(&head->node);
+ btrfs_put_delayed_ref_head(head);
return -EAGAIN;
}
spin_unlock(&delayed_refs->lock);
@@ -7235,9 +7216,8 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
* at this point we have a head with no other entries. Go
* ahead and process it.
*/
- head->node.in_tree = 0;
rb_erase(&head->href_node, &delayed_refs->href_root);
-
+ RB_CLEAR_NODE(&head->href_node);
atomic_dec(&delayed_refs->num_entries);
/*
@@ -7256,7 +7236,7 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
ret = 1;
mutex_unlock(&head->mutex);
- btrfs_put_delayed_ref(&head->node);
+ btrfs_put_delayed_ref_head(head);
return ret;
out:
spin_unlock(&head->lock);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 20:04:37 +0000