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Diffstat (limited to 'fs/btrfs/backref.c')
-rw-r--r--fs/btrfs/backref.c84
1 files changed, 30 insertions, 54 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index aded3ef3d3d4..aad7201ad11b 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -220,7 +220,8 @@ static int __add_prelim_ref(struct list_head *head, u64 root_id,
static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
struct ulist *parents, struct __prelim_ref *ref,
- int level, u64 time_seq, const u64 *extent_item_pos)
+ int level, u64 time_seq, const u64 *extent_item_pos,
+ u64 total_refs)
{
int ret = 0;
int slot;
@@ -249,7 +250,7 @@ static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0]))
ret = btrfs_next_old_leaf(root, path, time_seq);
- while (!ret && count < ref->count) {
+ while (!ret && count < total_refs) {
eb = path->nodes[0];
slot = path->slots[0];
@@ -306,7 +307,7 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
struct btrfs_path *path, u64 time_seq,
struct __prelim_ref *ref,
struct ulist *parents,
- const u64 *extent_item_pos)
+ const u64 *extent_item_pos, u64 total_refs)
{
struct btrfs_root *root;
struct btrfs_key root_key;
@@ -361,7 +362,7 @@ static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
}
ret = add_all_parents(root, path, parents, ref, level, time_seq,
- extent_item_pos);
+ extent_item_pos, total_refs);
out:
path->lowest_level = 0;
btrfs_release_path(path);
@@ -374,7 +375,7 @@ out:
static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
struct btrfs_path *path, u64 time_seq,
struct list_head *head,
- const u64 *extent_item_pos)
+ const u64 *extent_item_pos, u64 total_refs)
{
int err;
int ret = 0;
@@ -400,7 +401,8 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
if (ref->count == 0)
continue;
err = __resolve_indirect_ref(fs_info, path, time_seq, ref,
- parents, extent_item_pos);
+ parents, extent_item_pos,
+ total_refs);
/*
* we can only tolerate ENOENT,otherwise,we should catch error
* and return directly.
@@ -557,7 +559,7 @@ static void __merge_refs(struct list_head *head, int mode)
* smaller or equal that seq to the list
*/
static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
- struct list_head *prefs)
+ struct list_head *prefs, u64 *total_refs)
{
struct btrfs_delayed_extent_op *extent_op = head->extent_op;
struct rb_node *n = &head->node.rb_node;
@@ -593,6 +595,7 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
default:
BUG_ON(1);
}
+ *total_refs += (node->ref_mod * sgn);
switch (node->type) {
case BTRFS_TREE_BLOCK_REF_KEY: {
struct btrfs_delayed_tree_ref *ref;
@@ -653,7 +656,8 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
*/
static int __add_inline_refs(struct btrfs_fs_info *fs_info,
struct btrfs_path *path, u64 bytenr,
- int *info_level, struct list_head *prefs)
+ int *info_level, struct list_head *prefs,
+ u64 *total_refs)
{
int ret = 0;
int slot;
@@ -677,6 +681,7 @@ static int __add_inline_refs(struct btrfs_fs_info *fs_info,
ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item);
flags = btrfs_extent_flags(leaf, ei);
+ *total_refs += btrfs_extent_refs(leaf, ei);
btrfs_item_key_to_cpu(leaf, &found_key, slot);
ptr = (unsigned long)(ei + 1);
@@ -859,6 +864,7 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
struct list_head prefs;
struct __prelim_ref *ref;
struct extent_inode_elem *eie = NULL;
+ u64 total_refs = 0;
INIT_LIST_HEAD(&prefs);
INIT_LIST_HEAD(&prefs_delayed);
@@ -873,8 +879,10 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
- if (!trans)
+ if (!trans) {
path->search_commit_root = 1;
+ path->skip_locking = 1;
+ }
/*
* grab both a lock on the path and a lock on the delayed ref head.
@@ -915,7 +923,7 @@ again:
}
spin_unlock(&delayed_refs->lock);
ret = __add_delayed_refs(head, time_seq,
- &prefs_delayed);
+ &prefs_delayed, &total_refs);
mutex_unlock(&head->mutex);
if (ret)
goto out;
@@ -936,7 +944,8 @@ again:
(key.type == BTRFS_EXTENT_ITEM_KEY ||
key.type == BTRFS_METADATA_ITEM_KEY)) {
ret = __add_inline_refs(fs_info, path, bytenr,
- &info_level, &prefs);
+ &info_level, &prefs,
+ &total_refs);
if (ret)
goto out;
ret = __add_keyed_refs(fs_info, path, bytenr,
@@ -956,7 +965,7 @@ again:
__merge_refs(&prefs, 1);
ret = __resolve_indirect_refs(fs_info, path, time_seq, &prefs,
- extent_item_pos);
+ extent_item_pos, total_refs);
if (ret)
goto out;
@@ -965,7 +974,7 @@ again:
while (!list_empty(&prefs)) {
ref = list_first_entry(&prefs, struct __prelim_ref, list);
WARN_ON(ref->count < 0);
- if (ref->count && ref->root_id && ref->parent == 0) {
+ if (roots && ref->count && ref->root_id && ref->parent == 0) {
/* no parent == root of tree */
ret = ulist_add(roots, ref->root_id, 0, GFP_NOFS);
if (ret < 0)
@@ -1061,22 +1070,14 @@ static int btrfs_find_all_leafs(struct btrfs_trans_handle *trans,
u64 time_seq, struct ulist **leafs,
const u64 *extent_item_pos)
{
- struct ulist *tmp;
int ret;
- tmp = ulist_alloc(GFP_NOFS);
- if (!tmp)
- return -ENOMEM;
*leafs = ulist_alloc(GFP_NOFS);
- if (!*leafs) {
- ulist_free(tmp);
+ if (!*leafs)
return -ENOMEM;
- }
ret = find_parent_nodes(trans, fs_info, bytenr,
- time_seq, *leafs, tmp, extent_item_pos);
- ulist_free(tmp);
-
+ time_seq, *leafs, NULL, extent_item_pos);
if (ret < 0 && ret != -ENOENT) {
free_leaf_list(*leafs);
return ret;
@@ -1333,38 +1334,13 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
if (ret < 0)
return ret;
- while (1) {
- u32 nritems;
- if (path->slots[0] == 0) {
- btrfs_set_path_blocking(path);
- ret = btrfs_prev_leaf(fs_info->extent_root, path);
- if (ret != 0) {
- if (ret > 0) {
- pr_debug("logical %llu is not within "
- "any extent\n", logical);
- ret = -ENOENT;
- }
- return ret;
- }
- } else {
- path->slots[0]--;
- }
- nritems = btrfs_header_nritems(path->nodes[0]);
- if (nritems == 0) {
- pr_debug("logical %llu is not within any extent\n",
- logical);
- return -ENOENT;
- }
- if (path->slots[0] == nritems)
- path->slots[0]--;
-
- btrfs_item_key_to_cpu(path->nodes[0], found_key,
- path->slots[0]);
- if (found_key->type == BTRFS_EXTENT_ITEM_KEY ||
- found_key->type == BTRFS_METADATA_ITEM_KEY)
- break;
+ ret = btrfs_previous_extent_item(fs_info->extent_root, path, 0);
+ if (ret) {
+ if (ret > 0)
+ ret = -ENOENT;
+ return ret;
}
-
+ btrfs_item_key_to_cpu(path->nodes[0], found_key, path->slots[0]);
if (found_key->type == BTRFS_METADATA_ITEM_KEY)
size = fs_info->extent_root->leafsize;
else if (found_key->type == BTRFS_EXTENT_ITEM_KEY)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 23:06:40 +0100