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-rw-r--r--fs/btrfs/backref.c30
-rw-r--r--fs/btrfs/backref.h3
-rw-r--r--fs/btrfs/ctree.c275
-rw-r--r--fs/btrfs/ctree.h31
-rw-r--r--fs/btrfs/delayed-ref.c44
-rw-r--r--fs/btrfs/delayed-ref.h49
-rw-r--r--fs/btrfs/disk-io.c2
-rw-r--r--fs/btrfs/extent-tree.c21
-rw-r--r--fs/btrfs/transaction.c4
9 files changed, 240 insertions, 219 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index a383c18..7d80ddd 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -773,9 +773,8 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
*/
static int find_parent_nodes(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 bytenr,
- u64 delayed_ref_seq, u64 time_seq,
- struct ulist *refs, struct ulist *roots,
- const u64 *extent_item_pos)
+ u64 time_seq, struct ulist *refs,
+ struct ulist *roots, const u64 *extent_item_pos)
{
struct btrfs_key key;
struct btrfs_path *path;
@@ -837,7 +836,7 @@ again:
btrfs_put_delayed_ref(&head->node);
goto again;
}
- ret = __add_delayed_refs(head, delayed_ref_seq,
+ ret = __add_delayed_refs(head, time_seq,
&prefs_delayed);
mutex_unlock(&head->mutex);
if (ret) {
@@ -981,8 +980,7 @@ static void free_leaf_list(struct ulist *blocks)
*/
static int btrfs_find_all_leafs(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 bytenr,
- u64 delayed_ref_seq, u64 time_seq,
- struct ulist **leafs,
+ u64 time_seq, struct ulist **leafs,
const u64 *extent_item_pos)
{
struct ulist *tmp;
@@ -997,7 +995,7 @@ static int btrfs_find_all_leafs(struct btrfs_trans_handle *trans,
return -ENOMEM;
}
- ret = find_parent_nodes(trans, fs_info, bytenr, delayed_ref_seq,
+ ret = find_parent_nodes(trans, fs_info, bytenr,
time_seq, *leafs, tmp, extent_item_pos);
ulist_free(tmp);
@@ -1024,8 +1022,7 @@ static int btrfs_find_all_leafs(struct btrfs_trans_handle *trans,
*/
int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 bytenr,
- u64 delayed_ref_seq, u64 time_seq,
- struct ulist **roots)
+ u64 time_seq, struct ulist **roots)
{
struct ulist *tmp;
struct ulist_node *node = NULL;
@@ -1043,7 +1040,7 @@ int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
ULIST_ITER_INIT(&uiter);
while (1) {
- ret = find_parent_nodes(trans, fs_info, bytenr, delayed_ref_seq,
+ ret = find_parent_nodes(trans, fs_info, bytenr,
time_seq, tmp, *roots, NULL);
if (ret < 0 && ret != -ENOENT) {
ulist_free(tmp);
@@ -1376,11 +1373,9 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
struct ulist *roots = NULL;
struct ulist_node *ref_node = NULL;
struct ulist_node *root_node = NULL;
- struct seq_list seq_elem = {};
struct seq_list tree_mod_seq_elem = {};
struct ulist_iterator ref_uiter;
struct ulist_iterator root_uiter;
- struct btrfs_delayed_ref_root *delayed_refs = NULL;
pr_debug("resolving all inodes for extent %llu\n",
extent_item_objectid);
@@ -1391,16 +1386,11 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
trans = btrfs_join_transaction(fs_info->extent_root);
if (IS_ERR(trans))
return PTR_ERR(trans);
-
- delayed_refs = &trans->transaction->delayed_refs;
- spin_lock(&delayed_refs->lock);
- btrfs_get_delayed_seq(delayed_refs, &seq_elem);
- spin_unlock(&delayed_refs->lock);
btrfs_get_tree_mod_seq(fs_info, &tree_mod_seq_elem);
}
ret = btrfs_find_all_leafs(trans, fs_info, extent_item_objectid,
- seq_elem.seq, tree_mod_seq_elem.seq, &refs,
+ tree_mod_seq_elem.seq, &refs,
&extent_item_pos);
if (ret)
goto out;
@@ -1408,8 +1398,7 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
ULIST_ITER_INIT(&ref_uiter);
while (!ret && (ref_node = ulist_next(refs, &ref_uiter))) {
ret = btrfs_find_all_roots(trans, fs_info, ref_node->val,
- seq_elem.seq,
- tree_mod_seq_elem.seq, &roots);
+ tree_mod_seq_elem.seq, &roots);
if (ret)
break;
ULIST_ITER_INIT(&root_uiter);
@@ -1431,7 +1420,6 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
out:
if (!search_commit_root) {
btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);
- btrfs_put_delayed_seq(delayed_refs, &seq_elem);
btrfs_end_transaction(trans, fs_info->extent_root);
}
diff --git a/fs/btrfs/backref.h b/fs/btrfs/backref.h
index c18d8ac..3a1ad3e 100644
--- a/fs/btrfs/backref.h
+++ b/fs/btrfs/backref.h
@@ -58,8 +58,7 @@ int paths_from_inode(u64 inum, struct inode_fs_paths *ipath);
int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 bytenr,
- u64 delayed_ref_seq, u64 time_seq,
- struct ulist **roots);
+ u64 time_seq, struct ulist **roots);
struct btrfs_data_container *init_data_container(u32 total_bytes);
struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root,
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 67fe46f..bef68ab 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -321,7 +321,7 @@ struct tree_mod_root {
struct tree_mod_elem {
struct rb_node node;
u64 index; /* shifted logical */
- struct seq_list elem;
+ u64 seq;
enum mod_log_op op;
/* this is used for MOD_LOG_KEY_* and MOD_LOG_MOVE_KEYS operations */
@@ -341,20 +341,50 @@ struct tree_mod_elem {
struct tree_mod_root old_root;
};
-static inline void
-__get_tree_mod_seq(struct btrfs_fs_info *fs_info, struct seq_list *elem)
+static inline void tree_mod_log_read_lock(struct btrfs_fs_info *fs_info)
{
- elem->seq = atomic_inc_return(&fs_info->tree_mod_seq);
- list_add_tail(&elem->list, &fs_info->tree_mod_seq_list);
+ read_lock(&fs_info->tree_mod_log_lock);
}
-void btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
- struct seq_list *elem)
+static inline void tree_mod_log_read_unlock(struct btrfs_fs_info *fs_info)
+{
+ read_unlock(&fs_info->tree_mod_log_lock);
+}
+
+static inline void tree_mod_log_write_lock(struct btrfs_fs_info *fs_info)
+{
+ write_lock(&fs_info->tree_mod_log_lock);
+}
+
+static inline void tree_mod_log_write_unlock(struct btrfs_fs_info *fs_info)
{
- elem->flags = 1;
+ write_unlock(&fs_info->tree_mod_log_lock);
+}
+
+/*
+ * This adds a new blocker to the tree mod log's blocker list if the @elem
+ * passed does not already have a sequence number set. So when a caller expects
+ * to record tree modifications, it should ensure to set elem->seq to zero
+ * before calling btrfs_get_tree_mod_seq.
+ * Returns a fresh, unused tree log modification sequence number, even if no new
+ * blocker was added.
+ */
+u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
+ struct seq_list *elem)
+{
+ u64 seq;
+
+ tree_mod_log_write_lock(fs_info);
spin_lock(&fs_info->tree_mod_seq_lock);
- __get_tree_mod_seq(fs_info, elem);
+ if (!elem->seq) {
+ elem->seq = btrfs_inc_tree_mod_seq(fs_info);
+ list_add_tail(&elem->list, &fs_info->tree_mod_seq_list);
+ }
+ seq = btrfs_inc_tree_mod_seq(fs_info);
spin_unlock(&fs_info->tree_mod_seq_lock);
+ tree_mod_log_write_unlock(fs_info);
+
+ return seq;
}
void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
@@ -371,41 +401,46 @@ void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
if (!seq_putting)
return;
- BUG_ON(!(elem->flags & 1));
spin_lock(&fs_info->tree_mod_seq_lock);
list_del(&elem->list);
+ elem->seq = 0;
list_for_each_entry(cur_elem, &fs_info->tree_mod_seq_list, list) {
- if ((cur_elem->flags & 1) && cur_elem->seq < min_seq) {
+ if (cur_elem->seq < min_seq) {
if (seq_putting > cur_elem->seq) {
/*
* blocker with lower sequence number exists, we
* cannot remove anything from the log
*/
- goto out;
+ spin_unlock(&fs_info->tree_mod_seq_lock);
+ return;
}
min_seq = cur_elem->seq;
}
}
+ spin_unlock(&fs_info->tree_mod_seq_lock);
+
+ /*
+ * we removed the lowest blocker from the blocker list, so there may be
+ * more processible delayed refs.
+ */
+ wake_up(&fs_info->tree_mod_seq_wait);
/*
* anything that's lower than the lowest existing (read: blocked)
* sequence number can be removed from the tree.
*/
- write_lock(&fs_info->tree_mod_log_lock);
+ tree_mod_log_write_lock(fs_info);
tm_root = &fs_info->tree_mod_log;
for (node = rb_first(tm_root); node; node = next) {
next = rb_next(node);
tm = container_of(node, struct tree_mod_elem, node);
- if (tm->elem.seq > min_seq)
+ if (tm->seq > min_seq)
continue;
rb_erase(node, tm_root);
- list_del(&tm->elem.list);
kfree(tm);
}
- write_unlock(&fs_info->tree_mod_log_lock);
-out:
- spin_unlock(&fs_info->tree_mod_seq_lock);
+ tree_mod_log_write_unlock(fs_info);
}
/*
@@ -423,11 +458,9 @@ __tree_mod_log_insert(struct btrfs_fs_info *fs_info, struct tree_mod_elem *tm)
struct rb_node **new;
struct rb_node *parent = NULL;
struct tree_mod_elem *cur;
- int ret = 0;
- BUG_ON(!tm || !tm->elem.seq);
+ BUG_ON(!tm || !tm->seq);
- write_lock(&fs_info->tree_mod_log_lock);
tm_root = &fs_info->tree_mod_log;
new = &tm_root->rb_node;
while (*new) {
@@ -437,88 +470,81 @@ __tree_mod_log_insert(struct btrfs_fs_info *fs_info, struct tree_mod_elem *tm)
new = &((*new)->rb_left);
else if (cur->index > tm->index)
new = &((*new)->rb_right);
- else if (cur->elem.seq < tm->elem.seq)
+ else if (cur->seq < tm->seq)
new = &((*new)->rb_left);
- else if (cur->elem.seq > tm->elem.seq)
+ else if (cur->seq > tm->seq)
new = &((*new)->rb_right);
else {
kfree(tm);
- ret = -EEXIST;
- goto unlock;
+ return -EEXIST;
}
}
rb_link_node(&tm->node, parent, new);
rb_insert_color(&tm->node, tm_root);
-unlock:
- write_unlock(&fs_info->tree_mod_log_lock);
- return ret;
+ return 0;
}
+/*
+ * Determines if logging can be omitted. Returns 1 if it can. Otherwise, it
+ * returns zero with the tree_mod_log_lock acquired. The caller must hold
+ * this until all tree mod log insertions are recorded in the rb tree and then
+ * call tree_mod_log_write_unlock() to release.
+ */
static inline int tree_mod_dont_log(struct btrfs_fs_info *fs_info,
struct extent_buffer *eb) {
smp_mb();
if (list_empty(&(fs_info)->tree_mod_seq_list))
return 1;
- if (!eb)
- return 0;
- if (btrfs_header_level(eb) == 0)
+ if (eb && btrfs_header_level(eb) == 0)
return 1;
+
+ tree_mod_log_write_lock(fs_info);
+ if (list_empty(&fs_info->tree_mod_seq_list)) {
+ /*
+ * someone emptied the list while we were waiting for the lock.
+ * we must not add to the list when no blocker exists.
+ */
+ tree_mod_log_write_unlock(fs_info);
+ return 1;
+ }
+
return 0;
}
/*
- * This allocates memory and gets a tree modification sequence number when
- * needed.
+ * This allocates memory and gets a tree modification sequence number.
*
- * Returns 0 when no sequence number is needed, < 0 on error.
- * Returns 1 when a sequence number was added. In this case,
- * fs_info->tree_mod_seq_lock was acquired and must be released by the caller
- * after inserting into the rb tree.
+ * Returns <0 on error.
+ * Returns >0 (the added sequence number) on success.
*/
static inline int tree_mod_alloc(struct btrfs_fs_info *fs_info, gfp_t flags,
struct tree_mod_elem **tm_ret)
{
struct tree_mod_elem *tm;
- int seq;
- if (tree_mod_dont_log(fs_info, NULL))
- return 0;
-
- tm = *tm_ret = kzalloc(sizeof(*tm), flags);
+ /*
+ * once we switch from spin locks to something different, we should
+ * honor the flags parameter here.
+ */
+ tm = *tm_ret = kzalloc(sizeof(*tm), GFP_ATOMIC);
if (!tm)
return -ENOMEM;
- tm->elem.flags = 0;
- spin_lock(&fs_info->tree_mod_seq_lock);
- if (list_empty(&fs_info->tree_mod_seq_list)) {
- /*
- * someone emptied the list while we were waiting for the lock.
- * we must not add to the list, because no blocker exists. items
- * are removed from the list only when the existing blocker is
- * removed from the list.
- */
- kfree(tm);
- seq = 0;
- spin_unlock(&fs_info->tree_mod_seq_lock);
- } else {
- __get_tree_mod_seq(fs_info, &tm->elem);
- seq = tm->elem.seq;
- }
-
- return seq;
+ tm->seq = btrfs_inc_tree_mod_seq(fs_info);
+ return tm->seq;
}
-static noinline int
-tree_mod_log_insert_key_mask(struct btrfs_fs_info *fs_info,
- struct extent_buffer *eb, int slot,
- enum mod_log_op op, gfp_t flags)
+static inline int
+__tree_mod_log_insert_key(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb, int slot,
+ enum mod_log_op op, gfp_t flags)
{
- struct tree_mod_elem *tm;
int ret;
+ struct tree_mod_elem *tm;
ret = tree_mod_alloc(fs_info, flags, &tm);
- if (ret <= 0)
+ if (ret < 0)
return ret;
tm->index = eb->start >> PAGE_CACHE_SHIFT;
@@ -530,8 +556,22 @@ tree_mod_log_insert_key_mask(struct btrfs_fs_info *fs_info,
tm->slot = slot;
tm->generation = btrfs_node_ptr_generation(eb, slot);
- ret = __tree_mod_log_insert(fs_info, tm);
- spin_unlock(&fs_info->tree_mod_seq_lock);
+ return __tree_mod_log_insert(fs_info, tm);
+}
+
+static noinline int
+tree_mod_log_insert_key_mask(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb, int slot,
+ enum mod_log_op op, gfp_t flags)
+{
+ int ret;
+
+ if (tree_mod_dont_log(fs_info, eb))
+ return 0;
+
+ ret = __tree_mod_log_insert_key(fs_info, eb, slot, op, flags);
+
+ tree_mod_log_write_unlock(fs_info);
return ret;
}
@@ -543,6 +583,14 @@ tree_mod_log_insert_key(struct btrfs_fs_info *fs_info, struct extent_buffer *eb,
}
static noinline int
+tree_mod_log_insert_key_locked(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb, int slot,
+ enum mod_log_op op)
+{
+ return __tree_mod_log_insert_key(fs_info, eb, slot, op, GFP_NOFS);
+}
+
+static noinline int
tree_mod_log_insert_move(struct btrfs_fs_info *fs_info,
struct extent_buffer *eb, int dst_slot, int src_slot,
int nr_items, gfp_t flags)
@@ -555,14 +603,14 @@ tree_mod_log_insert_move(struct btrfs_fs_info *fs_info,
return 0;
for (i = 0; i + dst_slot < src_slot && i < nr_items; i++) {
- ret = tree_mod_log_insert_key(fs_info, eb, i + dst_slot,
+ ret = tree_mod_log_insert_key_locked(fs_info, eb, i + dst_slot,
MOD_LOG_KEY_REMOVE_WHILE_MOVING);
BUG_ON(ret < 0);
}
ret = tree_mod_alloc(fs_info, flags, &tm);
- if (ret <= 0)
- return ret;
+ if (ret < 0)
+ goto out;
tm->index = eb->start >> PAGE_CACHE_SHIFT;
tm->slot = src_slot;
@@ -571,10 +619,26 @@ tree_mod_log_insert_move(struct btrfs_fs_info *fs_info,
tm->op = MOD_LOG_MOVE_KEYS;
ret = __tree_mod_log_insert(fs_info, tm);
- spin_unlock(&fs_info->tree_mod_seq_lock);
+out:
+ tree_mod_log_write_unlock(fs_info);
return ret;
}
+static inline void
+__tree_mod_log_free_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb)
+{
+ int i;
+ u32 nritems;
+ int ret;
+
+ nritems = btrfs_header_nritems(eb);
+ for (i = nritems - 1; i >= 0; i--) {
+ ret = tree_mod_log_insert_key_locked(fs_info, eb, i,
+ MOD_LOG_KEY_REMOVE_WHILE_FREEING);
+ BUG_ON(ret < 0);
+ }
+}
+
static noinline int
tree_mod_log_insert_root(struct btrfs_fs_info *fs_info,
struct extent_buffer *old_root,
@@ -583,9 +647,14 @@ tree_mod_log_insert_root(struct btrfs_fs_info *fs_info,
struct tree_mod_elem *tm;
int ret;
+ if (tree_mod_dont_log(fs_info, NULL))
+ return 0;
+
+ __tree_mod_log_free_eb(fs_info, old_root);
+
ret = tree_mod_alloc(fs_info, flags, &tm);
- if (ret <= 0)
- return ret;
+ if (ret < 0)
+ goto out;
tm->index = new_root->start >> PAGE_CACHE_SHIFT;
tm->old_root.logical = old_root->start;
@@ -594,7 +663,8 @@ tree_mod_log_insert_root(struct btrfs_fs_info *fs_info,
tm->op = MOD_LOG_ROOT_REPLACE;
ret = __tree_mod_log_insert(fs_info, tm);
- spin_unlock(&fs_info->tree_mod_seq_lock);
+out:
+ tree_mod_log_write_unlock(fs_info);
return ret;
}
@@ -608,7 +678,7 @@ __tree_mod_log_search(struct btrfs_fs_info *fs_info, u64 start, u64 min_seq,
struct tree_mod_elem *found = NULL;
u64 index = start >> PAGE_CACHE_SHIFT;
- read_lock(&fs_info->tree_mod_log_lock);
+ tree_mod_log_read_lock(fs_info);
tm_root = &fs_info->tree_mod_log;
node = tm_root->rb_node;
while (node) {
@@ -617,18 +687,18 @@ __tree_mod_log_search(struct btrfs_fs_info *fs_info, u64 start, u64 min_seq,
node = node->rb_left;
} else if (cur->index > index) {
node = node->rb_right;
- } else if (cur->elem.seq < min_seq) {
+ } else if (cur->seq < min_seq) {
node = node->rb_left;
} else if (!smallest) {
/* we want the node with the highest seq */
if (found)
- BUG_ON(found->elem.seq > cur->elem.seq);
+ BUG_ON(found->seq > cur->seq);
found = cur;
node = node->rb_left;
- } else if (cur->elem.seq > min_seq) {
+ } else if (cur->seq > min_seq) {
/* we want the node with the smallest seq */
if (found)
- BUG_ON(found->elem.seq < cur->elem.seq);
+ BUG_ON(found->seq < cur->seq);
found = cur;
node = node->rb_right;
} else {
@@ -636,7 +706,7 @@ __tree_mod_log_search(struct btrfs_fs_info *fs_info, u64 start, u64 min_seq,
break;
}
}
- read_unlock(&fs_info->tree_mod_log_lock);
+ tree_mod_log_read_unlock(fs_info);
return found;
}
@@ -664,7 +734,7 @@ tree_mod_log_search(struct btrfs_fs_info *fs_info, u64 start, u64 min_seq)
return __tree_mod_log_search(fs_info, start, min_seq, 0);
}
-static inline void
+static noinline void
tree_mod_log_eb_copy(struct btrfs_fs_info *fs_info, struct extent_buffer *dst,
struct extent_buffer *src, unsigned long dst_offset,
unsigned long src_offset, int nr_items)
@@ -675,18 +745,23 @@ tree_mod_log_eb_copy(struct btrfs_fs_info *fs_info, struct extent_buffer *dst,
if (tree_mod_dont_log(fs_info, NULL))
return;
- if (btrfs_header_level(dst) == 0 && btrfs_header_level(src) == 0)
+ if (btrfs_header_level(dst) == 0 && btrfs_header_level(src) == 0) {
+ tree_mod_log_write_unlock(fs_info);
return;
+ }
- /* speed this up by single seq for all operations? */
for (i = 0; i < nr_items; i++) {
- ret = tree_mod_log_insert_key(fs_info, src, i + src_offset,
- MOD_LOG_KEY_REMOVE);
+ ret = tree_mod_log_insert_key_locked(fs_info, src,
+ i + src_offset,
+ MOD_LOG_KEY_REMOVE);
BUG_ON(ret < 0);
- ret = tree_mod_log_insert_key(fs_info, dst, i + dst_offset,
- MOD_LOG_KEY_ADD);
+ ret = tree_mod_log_insert_key_locked(fs_info, dst,
+ i + dst_offset,
+ MOD_LOG_KEY_ADD);
BUG_ON(ret < 0);
}
+
+ tree_mod_log_write_unlock(fs_info);
}
static inline void
@@ -699,7 +774,7 @@ tree_mod_log_eb_move(struct btrfs_fs_info *fs_info, struct extent_buffer *dst,
BUG_ON(ret < 0);
}
-static inline void
+static noinline void
tree_mod_log_set_node_key(struct btrfs_fs_info *fs_info,
struct extent_buffer *eb,
struct btrfs_disk_key *disk_key, int slot, int atomic)
@@ -712,30 +787,22 @@ tree_mod_log_set_node_key(struct btrfs_fs_info *fs_info,
BUG_ON(ret < 0);
}
-static void tree_mod_log_free_eb(struct btrfs_fs_info *fs_info,
- struct extent_buffer *eb)
+static noinline void
+tree_mod_log_free_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb)
{
- int i;
- int ret;
- u32 nritems;
-
if (tree_mod_dont_log(fs_info, eb))
return;
- nritems = btrfs_header_nritems(eb);
- for (i = nritems - 1; i >= 0; i--) {
- ret = tree_mod_log_insert_key(fs_info, eb, i,
- MOD_LOG_KEY_REMOVE_WHILE_FREEING);
- BUG_ON(ret < 0);
- }
+ __tree_mod_log_free_eb(fs_info, eb);
+
+ tree_mod_log_write_unlock(fs_info);
}
-static inline void
+static noinline void
tree_mod_log_set_root_pointer(struct btrfs_root *root,
struct extent_buffer *new_root_node)
{
int ret;
- tree_mod_log_free_eb(root->fs_info, root->node);
ret = tree_mod_log_insert_root(root->fs_info, root->node,
new_root_node, GFP_NOFS);
BUG_ON(ret < 0);
@@ -1069,7 +1136,7 @@ __tree_mod_log_rewind(struct extent_buffer *eb, u64 time_seq,
unsigned long p_size = sizeof(struct btrfs_key_ptr);
n = btrfs_header_nritems(eb);
- while (tm && tm->elem.seq >= time_seq) {
+ while (tm && tm->seq >= time_seq) {
/*
* all the operations are recorded with the operator used for
* the modification. as we're going backwards, we do the
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 84ac723..8f8dc46 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1030,6 +1030,13 @@ struct btrfs_block_group_cache {
struct list_head cluster_list;
};
+/* delayed seq elem */
+struct seq_list {
+ struct list_head list;
+ u64 seq;
+};
+
+/* fs_info */
struct reloc_control;
struct btrfs_device;
struct btrfs_fs_devices;
@@ -1144,6 +1151,8 @@ struct btrfs_fs_info {
spinlock_t tree_mod_seq_lock;
atomic_t tree_mod_seq;
struct list_head tree_mod_seq_list;
+ struct seq_list tree_mod_seq_elem;
+ wait_queue_head_t tree_mod_seq_wait;
/* this protects tree_mod_log */
rwlock_t tree_mod_log_lock;
@@ -2798,6 +2807,16 @@ static inline void free_fs_info(struct btrfs_fs_info *fs_info)
kfree(fs_info);
}
+/* tree mod log functions from ctree.c */
+u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
+ struct seq_list *elem);
+void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
+ struct seq_list *elem);
+static inline u64 btrfs_inc_tree_mod_seq(struct btrfs_fs_info *fs_info)
+{
+ return atomic_inc_return(&fs_info->tree_mod_seq);
+}
+
/* root-item.c */
int btrfs_find_root_ref(struct btrfs_root *tree_root,
struct btrfs_path *path,
@@ -3157,18 +3176,6 @@ void btrfs_reada_detach(void *handle);
int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
u64 start, int err);
-/* delayed seq elem */
-struct seq_list {
- struct list_head list;
- u64 seq;
- u32 flags;
-};
-
-void btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
- struct seq_list *elem);
-void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
- struct seq_list *elem);
-
static inline int is_fstree(u64 rootid)
{
if (rootid == BTRFS_FS_TREE_OBJECTID ||
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 13ae7b0..21a7577 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -233,22 +233,26 @@ int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
return 0;
}
-int btrfs_check_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs,
+int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info,
+ struct btrfs_delayed_ref_root *delayed_refs,
u64 seq)
{
struct seq_list *elem;
-
- assert_spin_locked(&delayed_refs->lock);
- if (list_empty(&delayed_refs->seq_head))
- return 0;
-
- elem = list_first_entry(&delayed_refs->seq_head, struct seq_list, list);
- if (seq >= elem->seq) {
- pr_debug("holding back delayed_ref %llu, lowest is %llu (%p)\n",
- seq, elem->seq, delayed_refs);
- return 1;
+ int ret = 0;
+
+ spin_lock(&fs_info->tree_mod_seq_lock);
+ if (!list_empty(&fs_info->tree_mod_seq_list)) {
+ elem = list_first_entry(&fs_info->tree_mod_seq_list,
+ struct seq_list, list);
+ if (seq >= elem->seq) {
+ pr_debug("holding back delayed_ref %llu, lowest is "
+ "%llu (%p)\n", seq, elem->seq, delayed_refs);
+ ret = 1;
+ }
}
- return 0;
+
+ spin_unlock(&fs_info->tree_mod_seq_lock);
+ return ret;
}
int btrfs_find_ref_cluster(struct btrfs_trans_handle *trans,
@@ -526,7 +530,7 @@ static noinline void add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
ref->in_tree = 1;
if (is_fstree(ref_root))
- seq = inc_delayed_seq(delayed_refs);
+ seq = btrfs_inc_tree_mod_seq(fs_info);
ref->seq = seq;
full_ref = btrfs_delayed_node_to_tree_ref(ref);
@@ -585,7 +589,7 @@ static noinline void add_delayed_data_ref(struct btrfs_fs_info *fs_info,
ref->in_tree = 1;
if (is_fstree(ref_root))
- seq = inc_delayed_seq(delayed_refs);
+ seq = btrfs_inc_tree_mod_seq(fs_info);
ref->seq = seq;
full_ref = btrfs_delayed_node_to_data_ref(ref);
@@ -659,8 +663,8 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
num_bytes, parent, ref_root, level, action,
for_cow);
if (!is_fstree(ref_root) &&
- waitqueue_active(&delayed_refs->seq_wait))
- wake_up(&delayed_refs->seq_wait);
+ waitqueue_active(&fs_info->tree_mod_seq_wait))
+ wake_up(&fs_info->tree_mod_seq_wait);
spin_unlock(&delayed_refs->lock);
return 0;
@@ -708,8 +712,8 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
num_bytes, parent, ref_root, owner, offset,
action, for_cow);
if (!is_fstree(ref_root) &&
- waitqueue_active(&delayed_refs->seq_wait))
- wake_up(&delayed_refs->seq_wait);
+ waitqueue_active(&fs_info->tree_mod_seq_wait))
+ wake_up(&fs_info->tree_mod_seq_wait);
spin_unlock(&delayed_refs->lock);
return 0;
@@ -736,8 +740,8 @@ int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
num_bytes, BTRFS_UPDATE_DELAYED_HEAD,
extent_op->is_data);
- if (waitqueue_active(&delayed_refs->seq_wait))
- wake_up(&delayed_refs->seq_wait);
+ if (waitqueue_active(&fs_info->tree_mod_seq_wait))
+ wake_up(&fs_info->tree_mod_seq_wait);
spin_unlock(&delayed_refs->lock);
return 0;
}
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 413927f..2b5cb27 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -139,26 +139,6 @@ struct btrfs_delayed_ref_root {
int flushing;
u64 run_delayed_start;
-
- /*
- * seq number of delayed refs. We need to know if a backref was being
- * added before the currently processed ref or afterwards.
- */
- u64 seq;
-
- /*
- * seq_list holds a list of all seq numbers that are currently being
- * added to the list. While walking backrefs (btrfs_find_all_roots,
- * qgroups), which might take some time, no newer ref must be processed,
- * as it might influence the outcome of the walk.
- */
- struct list_head seq_head;
-
- /*
- * when the only refs we have in the list must not be processed, we want
- * to wait for more refs to show up or for the end of backref walking.
- */
- wait_queue_head_t seq_wait;
};
static inline void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref)
@@ -195,33 +175,8 @@ int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
int btrfs_find_ref_cluster(struct btrfs_trans_handle *trans,
struct list_head *cluster, u64 search_start);
-static inline u64 inc_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs)
-{
- assert_spin_locked(&delayed_refs->lock);
- ++delayed_refs->seq;
- return delayed_refs->seq;
-}
-
-static inline void
-btrfs_get_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs,
- struct seq_list *elem)
-{
- assert_spin_locked(&delayed_refs->lock);
- elem->seq = delayed_refs->seq;
- list_add_tail(&elem->list, &delayed_refs->seq_head);
-}
-
-static inline void
-btrfs_put_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs,
- struct seq_list *elem)
-{
- spin_lock(&delayed_refs->lock);
- list_del(&elem->list);
- wake_up(&delayed_refs->seq_wait);
- spin_unlock(&delayed_refs->lock);
-}
-
-int btrfs_check_delayed_seq(struct btrfs_delayed_ref_root *delayed_refs,
+int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info,
+ struct btrfs_delayed_ref_root *delayed_refs,
u64 seq);
/*
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 8cc4710..19a39e1 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1944,6 +1944,8 @@ int open_ctree(struct super_block *sb,
fs_info->free_chunk_space = 0;
fs_info->tree_mod_log = RB_ROOT;
+ init_waitqueue_head(&fs_info->tree_mod_seq_wait);
+
/* readahead state */
INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT);
spin_lock_init(&fs_info->reada_lock);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 6e1d367..94ce79f 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2217,6 +2217,7 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
struct btrfs_delayed_ref_node *ref;
struct btrfs_delayed_ref_head *locked_ref = NULL;
struct btrfs_delayed_extent_op *extent_op;
+ struct btrfs_fs_info *fs_info = root->fs_info;
int ret;
int count = 0;
int must_insert_reserved = 0;
@@ -2255,7 +2256,7 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
ref = select_delayed_ref(locked_ref);
if (ref && ref->seq &&
- btrfs_check_delayed_seq(delayed_refs, ref->seq)) {
+ btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) {
/*
* there are still refs with lower seq numbers in the
* process of being added. Don't run this ref yet.
@@ -2337,7 +2338,7 @@ static noinline int run_clustered_refs(struct btrfs_trans_handle *trans,
}
next:
- do_chunk_alloc(trans, root->fs_info->extent_root,
+ do_chunk_alloc(trans, fs_info->extent_root,
2 * 1024 * 1024,
btrfs_get_alloc_profile(root, 0),
CHUNK_ALLOC_NO_FORCE);
@@ -2347,18 +2348,19 @@ next:
return count;
}
-static void wait_for_more_refs(struct btrfs_delayed_ref_root *delayed_refs,
+static void wait_for_more_refs(struct btrfs_fs_info *fs_info,
+ struct btrfs_delayed_ref_root *delayed_refs,
unsigned long num_refs,
struct list_head *first_seq)
{
spin_unlock(&delayed_refs->lock);
pr_debug("waiting for more refs (num %ld, first %p)\n",
num_refs, first_seq);
- wait_event(delayed_refs->seq_wait,
+ wait_event(fs_info->tree_mod_seq_wait,
num_refs != delayed_refs->num_entries ||
- delayed_refs->seq_head.next != first_seq);
+ fs_info->tree_mod_seq_list.next != first_seq);
pr_debug("done waiting for more refs (num %ld, first %p)\n",
- delayed_refs->num_entries, delayed_refs->seq_head.next);
+ delayed_refs->num_entries, fs_info->tree_mod_seq_list.next);
spin_lock(&delayed_refs->lock);
}
@@ -2403,6 +2405,7 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
again:
consider_waiting = 0;
spin_lock(&delayed_refs->lock);
+
if (count == 0) {
count = delayed_refs->num_entries * 2;
run_most = 1;
@@ -2437,7 +2440,7 @@ again:
num_refs = delayed_refs->num_entries;
first_seq = root->fs_info->tree_mod_seq_list.next;
} else {
- wait_for_more_refs(delayed_refs,
+ wait_for_more_refs(root->fs_info, delayed_refs,
num_refs, first_seq);
/*
* after waiting, things have changed. we
@@ -5190,8 +5193,8 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
rb_erase(&head->node.rb_node, &delayed_refs->root);
delayed_refs->num_entries--;
- if (waitqueue_active(&delayed_refs->seq_wait))
- wake_up(&delayed_refs->seq_wait);
+ if (waitqueue_active(&root->fs_info->tree_mod_seq_wait))
+ wake_up(&root->fs_info->tree_mod_seq_wait);
/*
* we don't take a ref on the node because we're removing it from the
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index b72b068..621c8dc 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -38,7 +38,6 @@ void put_transaction(struct btrfs_transaction *transaction)
if (atomic_dec_and_test(&transaction->use_count)) {
BUG_ON(!list_empty(&transaction->list));
WARN_ON(transaction->delayed_refs.root.rb_node);
- WARN_ON(!list_empty(&transaction->delayed_refs.seq_head));
memset(transaction, 0, sizeof(*transaction));
kmem_cache_free(btrfs_transaction_cachep, transaction);
}
@@ -126,7 +125,6 @@ loop:
cur_trans->delayed_refs.num_heads = 0;
cur_trans->delayed_refs.flushing = 0;
cur_trans->delayed_refs.run_delayed_start = 0;
- cur_trans->delayed_refs.seq = 1;
/*
* although the tree mod log is per file system and not per transaction,
@@ -145,10 +143,8 @@ loop:
}
atomic_set(&fs_info->tree_mod_seq, 0);
- init_waitqueue_head(&cur_trans->delayed_refs.seq_wait);
spin_lock_init(&cur_trans->commit_lock);
spin_lock_init(&cur_trans->delayed_refs.lock);
- INIT_LIST_HEAD(&cur_trans->delayed_refs.seq_head);
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
list_add_tail(&cur_trans->list, &fs_info->trans_list);
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