1 files changed, 381 insertions, 0 deletions

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
new file mode 100644
index 000000000..4b217e9a5
--- /dev/null
+++ b/fs/btrfs/print-tree.c
@@ -0,0 +1,381 @@
+// 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->sectorsize))
+				pr_info(
+			"\t\t\t(parent %llu not aligned to sectorsize %u)\n",
+					offset, eb->fs_info->sectorsize);
+			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 not aligned to sectorsize %u)\n",
+				     offset, eb->fs_info->sectorsize);
+			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);
+	}
+}