From: Jan Schmidt Date: Wed, 16 May 2012 16:36:03 +0000 (+0200) Subject: Btrfs: use the tree modification log for backref resolving X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8445f61cad927b6efffdd4e042a51a783ff8853f;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git Btrfs: use the tree modification log for backref resolving 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 --- diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index fd13101aafa..0ac47f2834d 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -231,6 +231,7 @@ 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) @@ -266,7 +267,7 @@ 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, @@ -305,7 +306,7 @@ 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) { @@ -333,7 +334,8 @@ 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; @@ -750,7 +752,8 @@ 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; @@ -813,7 +816,8 @@ 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; @@ -854,8 +858,8 @@ 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; @@ -945,7 +949,8 @@ 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; @@ -960,8 +965,8 @@ 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) { @@ -987,7 +992,8 @@ 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; @@ -1005,8 +1011,8 @@ int btrfs_find_all_roots(struct btrfs_trans_handle *trans, ULIST_ITER_INIT(&uiter); 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); @@ -1338,7 +1344,8 @@ 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 ulist_iterator ref_uiter; struct ulist_iterator root_uiter; struct btrfs_delayed_ref_root *delayed_refs = NULL; @@ -1357,17 +1364,20 @@ 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; 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, &roots); + seq_elem.seq, + tree_mod_seq_elem.seq, &roots); if (ret) break; ULIST_ITER_INIT(&root_uiter); @@ -1388,6 +1398,7 @@ 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 94ba1b2e733..c18d8ac7b79 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,