btrfs-progs: check: switch to iterating over the backref_tree
We now have two data structures that can be used to iterate the same data set, and there may be quite a few of them in memory. Eliminating the list_head member will reduce memory consumption while iterating over the extent backrefs. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jeff Mahoney
David Sterba
parent
756105181e
commit
ad39e6252b
81
cmds-check.c
81
cmds-check.c
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@ -85,7 +85,6 @@ enum btrfs_check_mode {
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static enum btrfs_check_mode check_mode = CHECK_MODE_DEFAULT;
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struct extent_backref {
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struct list_head list;
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struct rb_node node;
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unsigned int is_data:1;
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unsigned int found_extent_tree:1;
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@ -94,11 +93,6 @@ struct extent_backref {
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unsigned int broken:1;
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};
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static inline struct extent_backref* to_extent_backref(struct list_head *entry)
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{
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return list_entry(entry, struct extent_backref, list);
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}
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static inline struct extent_backref* rb_node_to_extent_backref(struct rb_node *node)
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{
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return rb_entry(node, struct extent_backref, node);
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@ -5483,16 +5477,14 @@ static int do_check_fs_roots(struct btrfs_fs_info *fs_info,
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static int all_backpointers_checked(struct extent_record *rec, int print_errs)
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{
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struct list_head *cur = rec->backrefs.next;
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struct extent_backref *back;
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struct extent_backref *back, *tmp;
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struct tree_backref *tback;
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struct data_backref *dback;
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u64 found = 0;
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int err = 0;
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while(cur != &rec->backrefs) {
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back = to_extent_backref(cur);
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cur = cur->next;
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rbtree_postorder_for_each_entry_safe(back, tmp,
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&rec->backref_tree, node) {
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if (!back->found_extent_tree) {
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err = 1;
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if (!print_errs)
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@ -5595,17 +5587,16 @@ out:
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return err;
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}
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static int free_all_extent_backrefs(struct extent_record *rec)
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static void __free_one_backref(struct rb_node *node)
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{
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struct extent_backref *back;
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struct list_head *cur;
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while (!list_empty(&rec->backrefs)) {
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cur = rec->backrefs.next;
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back = to_extent_backref(cur);
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list_del(cur);
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struct extent_backref *back = rb_node_to_extent_backref(node);
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free(back);
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}
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return 0;
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}
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static void free_all_extent_backrefs(struct extent_record *rec)
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{
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rb_free_nodes(&rec->backref_tree, __free_one_backref);
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}
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static void free_extent_record_cache(struct cache_tree *extent_cache)
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@ -5644,7 +5635,7 @@ static int check_owner_ref(struct btrfs_root *root,
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struct extent_record *rec,
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struct extent_buffer *buf)
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{
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struct extent_backref *node;
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struct extent_backref *node, *tmp;
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struct tree_backref *back;
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struct btrfs_root *ref_root;
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struct btrfs_key key;
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@ -5654,7 +5645,8 @@ static int check_owner_ref(struct btrfs_root *root,
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int found = 0;
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int ret;
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list_for_each_entry(node, &rec->backrefs, list) {
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rbtree_postorder_for_each_entry_safe(node, tmp,
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&rec->backref_tree, node) {
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if (node->is_data)
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continue;
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if (!node->found_ref)
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@ -5699,14 +5691,12 @@ static int check_owner_ref(struct btrfs_root *root,
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static int is_extent_tree_record(struct extent_record *rec)
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{
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struct list_head *cur = rec->backrefs.next;
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struct extent_backref *node;
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struct extent_backref *node, *tmp;
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struct tree_backref *back;
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int is_extent = 0;
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while(cur != &rec->backrefs) {
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node = to_extent_backref(cur);
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cur = cur->next;
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rbtree_postorder_for_each_entry_safe(node, tmp,
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&rec->backref_tree, node) {
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if (node->is_data)
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return 0;
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back = to_tree_backref(node);
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@ -6116,7 +6106,6 @@ static struct tree_backref *alloc_tree_backref(struct extent_record *rec,
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ref->root = root;
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ref->node.full_backref = 0;
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}
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list_add_tail(&ref->node.list, &rec->backrefs);
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return ref;
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}
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@ -6186,7 +6175,6 @@ static struct data_backref *alloc_data_backref(struct extent_record *rec,
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ref->bytes = max_size;
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ref->found_ref = 0;
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ref->num_refs = 0;
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list_add_tail(&ref->node.list, &rec->backrefs);
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if (max_size > rec->max_size)
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rec->max_size = max_size;
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return ref;
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@ -6219,12 +6207,12 @@ static void check_extent_type(struct extent_record *rec)
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* Check SYSTEM extent, as it's also marked as metadata, we can only
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* make sure it's a SYSTEM extent by its backref
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*/
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if (!list_empty(&rec->backrefs)) {
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if (!RB_EMPTY_ROOT(&rec->backref_tree)) {
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struct extent_backref *node;
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struct tree_backref *tback;
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u64 bg_type;
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node = to_extent_backref(rec->backrefs.next);
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node = rb_node_to_extent_backref(rb_first(&rec->backref_tree));
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if (node->is_data) {
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/* tree block shouldn't have data backref */
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rec->wrong_chunk_type = 1;
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@ -8217,7 +8205,7 @@ static int free_extent_hook(struct btrfs_trans_handle *trans,
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back->node.found_extent_tree = 0;
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if (!back->node.found_extent_tree && back->node.found_ref) {
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list_del(&back->node.list);
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rb_erase(&back->node.node, &rec->backref_tree);
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free(back);
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}
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} else {
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@ -8236,7 +8224,7 @@ static int free_extent_hook(struct btrfs_trans_handle *trans,
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back->node.found_extent_tree = 0;
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}
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if (!back->node.found_extent_tree && back->node.found_ref) {
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list_del(&back->node.list);
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rb_erase(&back->node.node, &rec->backref_tree);
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free(back);
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}
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}
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@ -8677,7 +8665,7 @@ out:
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static int verify_backrefs(struct btrfs_fs_info *info, struct btrfs_path *path,
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struct extent_record *rec)
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{
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struct extent_backref *back;
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struct extent_backref *back, *tmp;
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struct data_backref *dback;
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struct extent_entry *entry, *best = NULL;
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LIST_HEAD(entries);
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@ -8693,7 +8681,8 @@ static int verify_backrefs(struct btrfs_fs_info *info, struct btrfs_path *path,
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if (rec->metadata)
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return 0;
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list_for_each_entry(back, &rec->backrefs, list) {
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rbtree_postorder_for_each_entry_safe(back, tmp,
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&rec->backref_tree, node) {
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if (back->full_backref || !back->is_data)
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continue;
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@ -8819,7 +8808,8 @@ static int verify_backrefs(struct btrfs_fs_info *info, struct btrfs_path *path,
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* Ok great we all agreed on an extent record, let's go find the real
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* references and fix up the ones that don't match.
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*/
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list_for_each_entry(back, &rec->backrefs, list) {
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rbtree_postorder_for_each_entry_safe(back, tmp,
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&rec->backref_tree, node) {
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if (back->full_backref || !back->is_data)
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continue;
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@ -9043,7 +9033,7 @@ static int find_possible_backrefs(struct btrfs_fs_info *info,
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struct extent_record *rec)
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{
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struct btrfs_root *root;
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struct extent_backref *back;
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struct extent_backref *back, *tmp;
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struct data_backref *dback;
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struct cache_extent *cache;
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struct btrfs_file_extent_item *fi;
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@ -9051,7 +9041,8 @@ static int find_possible_backrefs(struct btrfs_fs_info *info,
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u64 bytenr, bytes;
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int ret;
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list_for_each_entry(back, &rec->backrefs, list) {
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rbtree_postorder_for_each_entry_safe(back, tmp,
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&rec->backref_tree, node) {
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/* Don't care about full backrefs (poor unloved backrefs) */
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if (back->full_backref || !back->is_data)
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continue;
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@ -9139,7 +9130,7 @@ static int record_orphan_data_extents(struct btrfs_fs_info *fs_info,
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{
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struct btrfs_key key;
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struct btrfs_root *dest_root;
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struct extent_backref *back;
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struct extent_backref *back, *tmp;
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struct data_backref *dback;
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struct orphan_data_extent *orphan;
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struct btrfs_path path;
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@ -9149,7 +9140,8 @@ static int record_orphan_data_extents(struct btrfs_fs_info *fs_info,
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if (rec->metadata)
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return 1;
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btrfs_init_path(&path);
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list_for_each_entry(back, &rec->backrefs, list) {
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rbtree_postorder_for_each_entry_safe(back, tmp,
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&rec->backref_tree, node) {
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if (back->full_backref || !back->is_data ||
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!back->found_extent_tree)
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continue;
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@ -9217,9 +9209,8 @@ static int fixup_extent_refs(struct btrfs_fs_info *info,
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struct btrfs_trans_handle *trans = NULL;
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int ret;
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struct btrfs_path path;
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struct list_head *cur = rec->backrefs.next;
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struct cache_extent *cache;
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struct extent_backref *back;
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struct extent_backref *back, *tmp;
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int allocated = 0;
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u64 flags = 0;
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@ -9267,10 +9258,8 @@ static int fixup_extent_refs(struct btrfs_fs_info *info,
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}
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/* step three, recreate all the refs we did find */
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while(cur != &rec->backrefs) {
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back = to_extent_backref(cur);
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cur = cur->next;
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rbtree_postorder_for_each_entry_safe(back, tmp,
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&rec->backref_tree, node) {
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/*
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* if we didn't find any references, don't create a
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* new extent record
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