v4.19.13 snapshot.
diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
new file mode 100644
index 0000000..df49931
--- /dev/null
+++ b/fs/btrfs/print-tree.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ */
+
+#include "ctree.h"
+#include "disk-io.h"
+#include "print-tree.h"
+
+static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
+{
+ int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
+ int i;
+ pr_info("\t\tchunk length %llu owner %llu type %llu num_stripes %d\n",
+ btrfs_chunk_length(eb, chunk), btrfs_chunk_owner(eb, chunk),
+ btrfs_chunk_type(eb, chunk), num_stripes);
+ for (i = 0 ; i < num_stripes ; i++) {
+ pr_info("\t\t\tstripe %d devid %llu offset %llu\n", i,
+ btrfs_stripe_devid_nr(eb, chunk, i),
+ btrfs_stripe_offset_nr(eb, chunk, i));
+ }
+}
+static void print_dev_item(struct extent_buffer *eb,
+ struct btrfs_dev_item *dev_item)
+{
+ pr_info("\t\tdev item devid %llu total_bytes %llu bytes used %llu\n",
+ btrfs_device_id(eb, dev_item),
+ btrfs_device_total_bytes(eb, dev_item),
+ btrfs_device_bytes_used(eb, dev_item));
+}
+static void print_extent_data_ref(struct extent_buffer *eb,
+ struct btrfs_extent_data_ref *ref)
+{
+ pr_cont("extent data backref root %llu objectid %llu offset %llu count %u\n",
+ btrfs_extent_data_ref_root(eb, ref),
+ btrfs_extent_data_ref_objectid(eb, ref),
+ btrfs_extent_data_ref_offset(eb, ref),
+ btrfs_extent_data_ref_count(eb, ref));
+}
+
+static void print_extent_item(struct extent_buffer *eb, int slot, int type)
+{
+ struct btrfs_extent_item *ei;
+ struct btrfs_extent_inline_ref *iref;
+ struct btrfs_extent_data_ref *dref;
+ struct btrfs_shared_data_ref *sref;
+ struct btrfs_disk_key key;
+ unsigned long end;
+ unsigned long ptr;
+ u32 item_size = btrfs_item_size_nr(eb, slot);
+ u64 flags;
+ u64 offset;
+ int ref_index = 0;
+
+ if (unlikely(item_size < sizeof(*ei))) {
+ btrfs_print_v0_err(eb->fs_info);
+ btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
+ }
+
+ ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
+ flags = btrfs_extent_flags(eb, ei);
+
+ pr_info("\t\textent refs %llu gen %llu flags %llu\n",
+ btrfs_extent_refs(eb, ei), btrfs_extent_generation(eb, ei),
+ flags);
+
+ if ((type == BTRFS_EXTENT_ITEM_KEY) &&
+ flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
+ struct btrfs_tree_block_info *info;
+ info = (struct btrfs_tree_block_info *)(ei + 1);
+ btrfs_tree_block_key(eb, info, &key);
+ pr_info("\t\ttree block key (%llu %u %llu) level %d\n",
+ btrfs_disk_key_objectid(&key), key.type,
+ btrfs_disk_key_offset(&key),
+ btrfs_tree_block_level(eb, info));
+ iref = (struct btrfs_extent_inline_ref *)(info + 1);
+ } else {
+ iref = (struct btrfs_extent_inline_ref *)(ei + 1);
+ }
+
+ ptr = (unsigned long)iref;
+ end = (unsigned long)ei + item_size;
+ while (ptr < end) {
+ iref = (struct btrfs_extent_inline_ref *)ptr;
+ type = btrfs_extent_inline_ref_type(eb, iref);
+ offset = btrfs_extent_inline_ref_offset(eb, iref);
+ pr_info("\t\tref#%d: ", ref_index++);
+ switch (type) {
+ case BTRFS_TREE_BLOCK_REF_KEY:
+ pr_cont("tree block backref root %llu\n", offset);
+ break;
+ case BTRFS_SHARED_BLOCK_REF_KEY:
+ pr_cont("shared block backref parent %llu\n", offset);
+ /*
+ * offset is supposed to be a tree block which
+ * must be aligned to nodesize.
+ */
+ if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
+ pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
+ offset, (unsigned long long)eb->fs_info->nodesize);
+ break;
+ case BTRFS_EXTENT_DATA_REF_KEY:
+ dref = (struct btrfs_extent_data_ref *)(&iref->offset);
+ print_extent_data_ref(eb, dref);
+ break;
+ case BTRFS_SHARED_DATA_REF_KEY:
+ sref = (struct btrfs_shared_data_ref *)(iref + 1);
+ pr_cont("shared data backref parent %llu count %u\n",
+ offset, btrfs_shared_data_ref_count(eb, sref));
+ /*
+ * offset is supposed to be a tree block which
+ * must be aligned to nodesize.
+ */
+ if (!IS_ALIGNED(offset, eb->fs_info->nodesize))
+ pr_info("\t\t\t(parent %llu is NOT ALIGNED to nodesize %llu)\n",
+ offset, (unsigned long long)eb->fs_info->nodesize);
+ break;
+ default:
+ pr_cont("(extent %llu has INVALID ref type %d)\n",
+ eb->start, type);
+ return;
+ }
+ ptr += btrfs_extent_inline_ref_size(type);
+ }
+ WARN_ON(ptr > end);
+}
+
+static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
+ u32 item_size)
+{
+ if (!IS_ALIGNED(item_size, sizeof(u64))) {
+ pr_warn("BTRFS: uuid item with illegal size %lu!\n",
+ (unsigned long)item_size);
+ return;
+ }
+ while (item_size) {
+ __le64 subvol_id;
+
+ read_extent_buffer(l, &subvol_id, offset, sizeof(subvol_id));
+ pr_info("\t\tsubvol_id %llu\n",
+ (unsigned long long)le64_to_cpu(subvol_id));
+ item_size -= sizeof(u64);
+ offset += sizeof(u64);
+ }
+}
+
+/*
+ * Helper to output refs and locking status of extent buffer. Useful to debug
+ * race condition related problems.
+ */
+static void print_eb_refs_lock(struct extent_buffer *eb)
+{
+#ifdef CONFIG_BTRFS_DEBUG
+ btrfs_info(eb->fs_info,
+"refs %u lock (w:%d r:%d bw:%d br:%d sw:%d sr:%d) lock_owner %u current %u",
+ atomic_read(&eb->refs), atomic_read(&eb->write_locks),
+ atomic_read(&eb->read_locks),
+ atomic_read(&eb->blocking_writers),
+ atomic_read(&eb->blocking_readers),
+ atomic_read(&eb->spinning_writers),
+ atomic_read(&eb->spinning_readers),
+ eb->lock_owner, current->pid);
+#endif
+}
+
+void btrfs_print_leaf(struct extent_buffer *l)
+{
+ struct btrfs_fs_info *fs_info;
+ int i;
+ u32 type, nr;
+ struct btrfs_item *item;
+ struct btrfs_root_item *ri;
+ struct btrfs_dir_item *di;
+ struct btrfs_inode_item *ii;
+ struct btrfs_block_group_item *bi;
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_extent_data_ref *dref;
+ struct btrfs_shared_data_ref *sref;
+ struct btrfs_dev_extent *dev_extent;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+
+ if (!l)
+ return;
+
+ fs_info = l->fs_info;
+ nr = btrfs_header_nritems(l);
+
+ btrfs_info(fs_info,
+ "leaf %llu gen %llu total ptrs %d free space %d owner %llu",
+ btrfs_header_bytenr(l), btrfs_header_generation(l), nr,
+ btrfs_leaf_free_space(fs_info, l), btrfs_header_owner(l));
+ print_eb_refs_lock(l);
+ for (i = 0 ; i < nr ; i++) {
+ item = btrfs_item_nr(i);
+ btrfs_item_key_to_cpu(l, &key, i);
+ type = key.type;
+ pr_info("\titem %d key (%llu %u %llu) itemoff %d itemsize %d\n",
+ i, key.objectid, type, key.offset,
+ btrfs_item_offset(l, item), btrfs_item_size(l, item));
+ switch (type) {
+ case BTRFS_INODE_ITEM_KEY:
+ ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
+ pr_info("\t\tinode generation %llu size %llu mode %o\n",
+ btrfs_inode_generation(l, ii),
+ btrfs_inode_size(l, ii),
+ btrfs_inode_mode(l, ii));
+ break;
+ case BTRFS_DIR_ITEM_KEY:
+ di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
+ btrfs_dir_item_key_to_cpu(l, di, &found_key);
+ pr_info("\t\tdir oid %llu type %u\n",
+ found_key.objectid,
+ btrfs_dir_type(l, di));
+ break;
+ case BTRFS_ROOT_ITEM_KEY:
+ ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
+ pr_info("\t\troot data bytenr %llu refs %u\n",
+ btrfs_disk_root_bytenr(l, ri),
+ btrfs_disk_root_refs(l, ri));
+ break;
+ case BTRFS_EXTENT_ITEM_KEY:
+ case BTRFS_METADATA_ITEM_KEY:
+ print_extent_item(l, i, type);
+ break;
+ case BTRFS_TREE_BLOCK_REF_KEY:
+ pr_info("\t\ttree block backref\n");
+ break;
+ case BTRFS_SHARED_BLOCK_REF_KEY:
+ pr_info("\t\tshared block backref\n");
+ break;
+ case BTRFS_EXTENT_DATA_REF_KEY:
+ dref = btrfs_item_ptr(l, i,
+ struct btrfs_extent_data_ref);
+ print_extent_data_ref(l, dref);
+ break;
+ case BTRFS_SHARED_DATA_REF_KEY:
+ sref = btrfs_item_ptr(l, i,
+ struct btrfs_shared_data_ref);
+ pr_info("\t\tshared data backref count %u\n",
+ btrfs_shared_data_ref_count(l, sref));
+ break;
+ case BTRFS_EXTENT_DATA_KEY:
+ fi = btrfs_item_ptr(l, i,
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(l, fi) ==
+ BTRFS_FILE_EXTENT_INLINE) {
+ pr_info("\t\tinline extent data size %llu\n",
+ btrfs_file_extent_ram_bytes(l, fi));
+ break;
+ }
+ pr_info("\t\textent data disk bytenr %llu nr %llu\n",
+ btrfs_file_extent_disk_bytenr(l, fi),
+ btrfs_file_extent_disk_num_bytes(l, fi));
+ pr_info("\t\textent data offset %llu nr %llu ram %llu\n",
+ btrfs_file_extent_offset(l, fi),
+ btrfs_file_extent_num_bytes(l, fi),
+ btrfs_file_extent_ram_bytes(l, fi));
+ break;
+ case BTRFS_EXTENT_REF_V0_KEY:
+ btrfs_print_v0_err(fs_info);
+ btrfs_handle_fs_error(fs_info, -EINVAL, NULL);
+ break;
+ case BTRFS_BLOCK_GROUP_ITEM_KEY:
+ bi = btrfs_item_ptr(l, i,
+ struct btrfs_block_group_item);
+ pr_info(
+ "\t\tblock group used %llu chunk_objectid %llu flags %llu\n",
+ btrfs_disk_block_group_used(l, bi),
+ btrfs_disk_block_group_chunk_objectid(l, bi),
+ btrfs_disk_block_group_flags(l, bi));
+ break;
+ case BTRFS_CHUNK_ITEM_KEY:
+ print_chunk(l, btrfs_item_ptr(l, i,
+ struct btrfs_chunk));
+ break;
+ case BTRFS_DEV_ITEM_KEY:
+ print_dev_item(l, btrfs_item_ptr(l, i,
+ struct btrfs_dev_item));
+ break;
+ case BTRFS_DEV_EXTENT_KEY:
+ dev_extent = btrfs_item_ptr(l, i,
+ struct btrfs_dev_extent);
+ pr_info("\t\tdev extent chunk_tree %llu\n\t\tchunk objectid %llu chunk offset %llu length %llu\n",
+ btrfs_dev_extent_chunk_tree(l, dev_extent),
+ btrfs_dev_extent_chunk_objectid(l, dev_extent),
+ btrfs_dev_extent_chunk_offset(l, dev_extent),
+ btrfs_dev_extent_length(l, dev_extent));
+ break;
+ case BTRFS_PERSISTENT_ITEM_KEY:
+ pr_info("\t\tpersistent item objectid %llu offset %llu\n",
+ key.objectid, key.offset);
+ switch (key.objectid) {
+ case BTRFS_DEV_STATS_OBJECTID:
+ pr_info("\t\tdevice stats\n");
+ break;
+ default:
+ pr_info("\t\tunknown persistent item\n");
+ }
+ break;
+ case BTRFS_TEMPORARY_ITEM_KEY:
+ pr_info("\t\ttemporary item objectid %llu offset %llu\n",
+ key.objectid, key.offset);
+ switch (key.objectid) {
+ case BTRFS_BALANCE_OBJECTID:
+ pr_info("\t\tbalance status\n");
+ break;
+ default:
+ pr_info("\t\tunknown temporary item\n");
+ }
+ break;
+ case BTRFS_DEV_REPLACE_KEY:
+ pr_info("\t\tdev replace\n");
+ break;
+ case BTRFS_UUID_KEY_SUBVOL:
+ case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
+ print_uuid_item(l, btrfs_item_ptr_offset(l, i),
+ btrfs_item_size_nr(l, i));
+ break;
+ };
+ }
+}
+
+void btrfs_print_tree(struct extent_buffer *c, bool follow)
+{
+ struct btrfs_fs_info *fs_info;
+ int i; u32 nr;
+ struct btrfs_key key;
+ int level;
+
+ if (!c)
+ return;
+ fs_info = c->fs_info;
+ nr = btrfs_header_nritems(c);
+ level = btrfs_header_level(c);
+ if (level == 0) {
+ btrfs_print_leaf(c);
+ return;
+ }
+ btrfs_info(fs_info,
+ "node %llu level %d gen %llu total ptrs %d free spc %u owner %llu",
+ btrfs_header_bytenr(c), level, btrfs_header_generation(c),
+ nr, (u32)BTRFS_NODEPTRS_PER_BLOCK(fs_info) - nr,
+ btrfs_header_owner(c));
+ print_eb_refs_lock(c);
+ for (i = 0; i < nr; i++) {
+ btrfs_node_key_to_cpu(c, &key, i);
+ pr_info("\tkey %d (%llu %u %llu) block %llu gen %llu\n",
+ i, key.objectid, key.type, key.offset,
+ btrfs_node_blockptr(c, i),
+ btrfs_node_ptr_generation(c, i));
+ }
+ if (!follow)
+ return;
+ for (i = 0; i < nr; i++) {
+ struct btrfs_key first_key;
+ struct extent_buffer *next;
+
+ btrfs_node_key_to_cpu(c, &first_key, i);
+ next = read_tree_block(fs_info, btrfs_node_blockptr(c, i),
+ btrfs_node_ptr_generation(c, i),
+ level - 1, &first_key);
+ if (IS_ERR(next)) {
+ continue;
+ } else if (!extent_buffer_uptodate(next)) {
+ free_extent_buffer(next);
+ continue;
+ }
+
+ if (btrfs_is_leaf(next) &&
+ level != 1)
+ BUG();
+ if (btrfs_header_level(next) !=
+ level - 1)
+ BUG();
+ btrfs_print_tree(next, follow);
+ free_extent_buffer(next);
+ }
+}