This enables backref resolving on life trees while they are changing. This
is a prerequisite for quota groups and just nice to have for everything
else.
Signed-off-by: Jan Schmidt <list.bt...@jan-o-sch.net>
---
fs/btrfs/backref.c | 43 +++++++++++++++++++++++++++----------------
fs/btrfs/backref.h | 3 ++-
2 files changed, 29 insertions(+), 17 deletions(-)
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index e6c54d8..b63c2c5 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -241,6 +241,7 @@ add_parent:
*/
static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info,
int search_commit_root,
+ u64 time_seq,
struct __prelim_ref *ref,
struct ulist *parents,
const u64 *extent_item_pos)
@@ -276,7 +277,7 @@ static int __resolve_indirect_ref(struct btrfs_fs_info
*fs_info,
goto out;
path->lowest_level = level;
- ret = btrfs_search_slot(NULL, root, &ref->key_for_search, path, 0, 0);
+ ret = btrfs_search_old_slot(root, &ref->key_for_search, path, time_seq);
pr_debug("search slot in root %llu (level %d, ref count %d) returned "
"%d for key (%llu %u %llu)\n",
(unsigned long long)ref->root_id, level, ref->count, ret,
@@ -315,7 +316,7 @@ out:
* resolve all indirect backrefs from the list
*/
static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
- int search_commit_root,
+ int search_commit_root, u64 time_seq,
struct list_head *head,
const u64 *extent_item_pos)
{
@@ -342,7 +343,8 @@ static int __resolve_indirect_refs(struct btrfs_fs_info
*fs_info,
if (ref->count == 0)
continue;
err = __resolve_indirect_ref(fs_info, search_commit_root,
- ref, parents, extent_item_pos);
+ time_seq, ref, parents,
+ extent_item_pos);
if (err) {
if (ret == 0)
ret = err;
@@ -762,7 +764,8 @@ 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 seq, struct ulist *refs, struct ulist *roots,
+ u64 delayed_ref_seq, u64 time_seq,
+ struct ulist *refs, struct ulist *roots,
const u64 *extent_item_pos)
{
struct btrfs_key key;
@@ -825,7 +828,8 @@ again:
btrfs_put_delayed_ref(&head->node);
goto again;
}
- ret = __add_delayed_refs(head, seq, &prefs_delayed);
+ ret = __add_delayed_refs(head, delayed_ref_seq,
+ &prefs_delayed);
if (ret) {
spin_unlock(&delayed_refs->lock);
goto out;
@@ -865,8 +869,8 @@ again:
if (ret)
goto out;
- ret = __resolve_indirect_refs(fs_info, search_commit_root, &prefs,
- extent_item_pos);
+ ret = __resolve_indirect_refs(fs_info, search_commit_root, time_seq,
+ &prefs, extent_item_pos);
if (ret)
goto out;
@@ -956,7 +960,8 @@ 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 seq, struct ulist **leafs,
+ u64 delayed_ref_seq, u64 time_seq,
+ struct ulist **leafs,
const u64 *extent_item_pos)
{
struct ulist *tmp;
@@ -971,8 +976,8 @@ static int btrfs_find_all_leafs(struct btrfs_trans_handle
*trans,
return -ENOMEM;
}
- ret = find_parent_nodes(trans, fs_info, bytenr, seq, *leafs, tmp,
- extent_item_pos);
+ ret = find_parent_nodes(trans, fs_info, bytenr, delayed_ref_seq,
+ time_seq, *leafs, tmp, extent_item_pos);
ulist_free(tmp);
if (ret < 0 && ret != -ENOENT) {
@@ -998,7 +1003,8 @@ 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 seq, struct ulist **roots)
+ u64 delayed_ref_seq, u64 time_seq,
+ struct ulist **roots)
{
struct ulist *tmp;
struct ulist_node *node = NULL;
@@ -1014,8 +1020,8 @@ int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
}
while (1) {
- ret = find_parent_nodes(trans, fs_info, bytenr, seq,
- tmp, *roots, NULL);
+ ret = find_parent_nodes(trans, fs_info, bytenr, delayed_ref_seq,
+ time_seq, tmp, *roots, NULL);
if (ret < 0 && ret != -ENOENT) {
ulist_free(tmp);
ulist_free(*roots);
@@ -1413,7 +1419,8 @@ 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 seq_elem = {};
+ struct seq_list tree_mod_seq_elem = {};
struct btrfs_delayed_ref_root *delayed_refs = NULL;
pr_debug("resolving all inodes for extent %llu\n",
@@ -1430,16 +1437,19 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
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, &refs, &extent_item_pos);
+ seq_elem.seq, tree_mod_seq_elem.seq, &refs,
+ &extent_item_pos);
if (ret)
goto out;
while (!ret && (ref_node = ulist_next(refs, ref_node))) {
ret = btrfs_find_all_roots(trans, fs_info, ref_node->val,
- seq_elem.seq, &roots);
+ seq_elem.seq,
+ tree_mod_seq_elem.seq, &roots);
if (ret)
break;
while (!ret && (root_node = ulist_next(roots, root_node))) {
@@ -1457,6 +1467,7 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
ulist_free(roots);
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 94ba1b2..c18d8ac 100644
--- a/fs/btrfs/backref.h
+++ b/fs/btrfs/backref.h
@@ -58,7 +58,8 @@ 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 seq, struct ulist **roots);
+ u64 delayed_ref_seq, 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,
--
1.7.3.4
--
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