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In order to implement simple quota groups, we need to be able to associate a data extent with the subvolume that created it. Once you account for reflink, this information cannot be recovered without explicitly storing it. Options for storing it are: - a new key/item - a new extent inline ref item The former is backwards compatible, but wastes space, the latter is incompat, but is efficient in space and reuses the existing inline ref machinery, while only abusing it a tiny amount -- specifically, the new item is not a ref, per-se. Signed-off-by: Boris Burkov <boris@bur.io> Signed-off-by: David Sterba <dsterba@suse.com>
450 lines
14 KiB
C
450 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#include "messages.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "print-tree.h"
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#include "accessors.h"
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#include "tree-checker.h"
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#include "volumes.h"
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#include "raid-stripe-tree.h"
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struct root_name_map {
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u64 id;
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char name[16];
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};
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static const struct root_name_map root_map[] = {
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{ BTRFS_ROOT_TREE_OBJECTID, "ROOT_TREE" },
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{ BTRFS_EXTENT_TREE_OBJECTID, "EXTENT_TREE" },
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{ BTRFS_CHUNK_TREE_OBJECTID, "CHUNK_TREE" },
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{ BTRFS_DEV_TREE_OBJECTID, "DEV_TREE" },
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{ BTRFS_FS_TREE_OBJECTID, "FS_TREE" },
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{ BTRFS_CSUM_TREE_OBJECTID, "CSUM_TREE" },
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{ BTRFS_TREE_LOG_OBJECTID, "TREE_LOG" },
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{ BTRFS_QUOTA_TREE_OBJECTID, "QUOTA_TREE" },
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{ BTRFS_UUID_TREE_OBJECTID, "UUID_TREE" },
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{ BTRFS_FREE_SPACE_TREE_OBJECTID, "FREE_SPACE_TREE" },
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{ BTRFS_BLOCK_GROUP_TREE_OBJECTID, "BLOCK_GROUP_TREE" },
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{ BTRFS_DATA_RELOC_TREE_OBJECTID, "DATA_RELOC_TREE" },
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{ BTRFS_RAID_STRIPE_TREE_OBJECTID, "RAID_STRIPE_TREE" },
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};
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const char *btrfs_root_name(const struct btrfs_key *key, char *buf)
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{
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int i;
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if (key->objectid == BTRFS_TREE_RELOC_OBJECTID) {
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snprintf(buf, BTRFS_ROOT_NAME_BUF_LEN,
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"TREE_RELOC offset=%llu", key->offset);
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return buf;
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}
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for (i = 0; i < ARRAY_SIZE(root_map); i++) {
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if (root_map[i].id == key->objectid)
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return root_map[i].name;
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}
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snprintf(buf, BTRFS_ROOT_NAME_BUF_LEN, "%llu", key->objectid);
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return buf;
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}
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static void print_chunk(const struct extent_buffer *eb, struct btrfs_chunk *chunk)
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{
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int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
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int i;
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pr_info("\t\tchunk length %llu owner %llu type %llu num_stripes %d\n",
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btrfs_chunk_length(eb, chunk), btrfs_chunk_owner(eb, chunk),
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btrfs_chunk_type(eb, chunk), num_stripes);
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for (i = 0 ; i < num_stripes ; i++) {
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pr_info("\t\t\tstripe %d devid %llu offset %llu\n", i,
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btrfs_stripe_devid_nr(eb, chunk, i),
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btrfs_stripe_offset_nr(eb, chunk, i));
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}
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}
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static void print_dev_item(const struct extent_buffer *eb,
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struct btrfs_dev_item *dev_item)
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{
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pr_info("\t\tdev item devid %llu total_bytes %llu bytes used %llu\n",
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btrfs_device_id(eb, dev_item),
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btrfs_device_total_bytes(eb, dev_item),
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btrfs_device_bytes_used(eb, dev_item));
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}
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static void print_extent_data_ref(const struct extent_buffer *eb,
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struct btrfs_extent_data_ref *ref)
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{
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pr_cont("extent data backref root %llu objectid %llu offset %llu count %u\n",
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btrfs_extent_data_ref_root(eb, ref),
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btrfs_extent_data_ref_objectid(eb, ref),
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btrfs_extent_data_ref_offset(eb, ref),
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btrfs_extent_data_ref_count(eb, ref));
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}
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static void print_extent_owner_ref(const struct extent_buffer *eb,
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const struct btrfs_extent_owner_ref *ref)
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{
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ASSERT(btrfs_fs_incompat(eb->fs_info, SIMPLE_QUOTA));
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pr_cont("extent data owner root %llu\n", btrfs_extent_owner_ref_root_id(eb, ref));
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}
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static void print_extent_item(const struct extent_buffer *eb, int slot, int type)
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{
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struct btrfs_extent_item *ei;
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struct btrfs_extent_inline_ref *iref;
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struct btrfs_extent_data_ref *dref;
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struct btrfs_shared_data_ref *sref;
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struct btrfs_extent_owner_ref *oref;
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struct btrfs_disk_key key;
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unsigned long end;
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unsigned long ptr;
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u32 item_size = btrfs_item_size(eb, slot);
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u64 flags;
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u64 offset;
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int ref_index = 0;
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if (unlikely(item_size < sizeof(*ei))) {
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btrfs_err(eb->fs_info,
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"unexpected extent item size, has %u expect >= %zu",
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item_size, sizeof(*ei));
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btrfs_handle_fs_error(eb->fs_info, -EUCLEAN, NULL);
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}
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ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
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flags = btrfs_extent_flags(eb, ei);
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pr_info("\t\textent refs %llu gen %llu flags %llu\n",
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btrfs_extent_refs(eb, ei), btrfs_extent_generation(eb, ei),
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flags);
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if ((type == BTRFS_EXTENT_ITEM_KEY) &&
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flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
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struct btrfs_tree_block_info *info;
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info = (struct btrfs_tree_block_info *)(ei + 1);
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btrfs_tree_block_key(eb, info, &key);
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pr_info("\t\ttree block key (%llu %u %llu) level %d\n",
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btrfs_disk_key_objectid(&key), key.type,
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btrfs_disk_key_offset(&key),
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btrfs_tree_block_level(eb, info));
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iref = (struct btrfs_extent_inline_ref *)(info + 1);
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} else {
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iref = (struct btrfs_extent_inline_ref *)(ei + 1);
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}
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ptr = (unsigned long)iref;
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end = (unsigned long)ei + item_size;
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while (ptr < end) {
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iref = (struct btrfs_extent_inline_ref *)ptr;
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type = btrfs_extent_inline_ref_type(eb, iref);
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offset = btrfs_extent_inline_ref_offset(eb, iref);
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pr_info("\t\tref#%d: ", ref_index++);
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switch (type) {
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case BTRFS_TREE_BLOCK_REF_KEY:
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pr_cont("tree block backref root %llu\n", offset);
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break;
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case BTRFS_SHARED_BLOCK_REF_KEY:
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pr_cont("shared block backref parent %llu\n", offset);
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/*
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* offset is supposed to be a tree block which
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* must be aligned to nodesize.
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*/
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if (!IS_ALIGNED(offset, eb->fs_info->sectorsize))
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pr_info(
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"\t\t\t(parent %llu not aligned to sectorsize %u)\n",
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offset, eb->fs_info->sectorsize);
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break;
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case BTRFS_EXTENT_DATA_REF_KEY:
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dref = (struct btrfs_extent_data_ref *)(&iref->offset);
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print_extent_data_ref(eb, dref);
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break;
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case BTRFS_SHARED_DATA_REF_KEY:
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sref = (struct btrfs_shared_data_ref *)(iref + 1);
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pr_cont("shared data backref parent %llu count %u\n",
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offset, btrfs_shared_data_ref_count(eb, sref));
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/*
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* Offset is supposed to be a tree block which must be
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* aligned to sectorsize.
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*/
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if (!IS_ALIGNED(offset, eb->fs_info->sectorsize))
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pr_info(
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"\t\t\t(parent %llu not aligned to sectorsize %u)\n",
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offset, eb->fs_info->sectorsize);
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break;
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case BTRFS_EXTENT_OWNER_REF_KEY:
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oref = (struct btrfs_extent_owner_ref *)(&iref->offset);
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print_extent_owner_ref(eb, oref);
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break;
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default:
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pr_cont("(extent %llu has INVALID ref type %d)\n",
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eb->start, type);
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return;
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}
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ptr += btrfs_extent_inline_ref_size(type);
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}
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WARN_ON(ptr > end);
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}
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static void print_uuid_item(const struct extent_buffer *l, unsigned long offset,
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u32 item_size)
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{
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if (!IS_ALIGNED(item_size, sizeof(u64))) {
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pr_warn("BTRFS: uuid item with illegal size %lu!\n",
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(unsigned long)item_size);
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return;
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}
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while (item_size) {
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__le64 subvol_id;
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read_extent_buffer(l, &subvol_id, offset, sizeof(subvol_id));
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pr_info("\t\tsubvol_id %llu\n", le64_to_cpu(subvol_id));
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item_size -= sizeof(u64);
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offset += sizeof(u64);
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}
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}
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static void print_raid_stripe_key(const struct extent_buffer *eb, u32 item_size,
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struct btrfs_stripe_extent *stripe)
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{
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const int num_stripes = btrfs_num_raid_stripes(item_size);
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const u8 encoding = btrfs_stripe_extent_encoding(eb, stripe);
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pr_info("\t\t\tencoding: %s\n",
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(encoding && encoding < BTRFS_NR_RAID_TYPES) ?
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btrfs_raid_array[encoding].raid_name : "unknown");
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for (int i = 0; i < num_stripes; i++)
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pr_info("\t\t\tstride %d devid %llu physical %llu\n",
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i, btrfs_raid_stride_devid(eb, &stripe->strides[i]),
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btrfs_raid_stride_physical(eb, &stripe->strides[i]));
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}
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/*
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* Helper to output refs and locking status of extent buffer. Useful to debug
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* race condition related problems.
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*/
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static void print_eb_refs_lock(const struct extent_buffer *eb)
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{
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#ifdef CONFIG_BTRFS_DEBUG
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btrfs_info(eb->fs_info, "refs %u lock_owner %u current %u",
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atomic_read(&eb->refs), eb->lock_owner, current->pid);
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#endif
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}
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void btrfs_print_leaf(const struct extent_buffer *l)
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{
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struct btrfs_fs_info *fs_info;
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int i;
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u32 type, nr;
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struct btrfs_root_item *ri;
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struct btrfs_dir_item *di;
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struct btrfs_inode_item *ii;
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struct btrfs_block_group_item *bi;
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struct btrfs_file_extent_item *fi;
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struct btrfs_extent_data_ref *dref;
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struct btrfs_shared_data_ref *sref;
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struct btrfs_dev_extent *dev_extent;
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struct btrfs_key key;
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struct btrfs_key found_key;
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if (!l)
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return;
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fs_info = l->fs_info;
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nr = btrfs_header_nritems(l);
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btrfs_info(fs_info,
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"leaf %llu gen %llu total ptrs %d free space %d owner %llu",
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btrfs_header_bytenr(l), btrfs_header_generation(l), nr,
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btrfs_leaf_free_space(l), btrfs_header_owner(l));
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print_eb_refs_lock(l);
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for (i = 0 ; i < nr ; i++) {
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btrfs_item_key_to_cpu(l, &key, i);
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type = key.type;
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pr_info("\titem %d key (%llu %u %llu) itemoff %d itemsize %d\n",
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i, key.objectid, type, key.offset,
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btrfs_item_offset(l, i), btrfs_item_size(l, i));
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switch (type) {
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case BTRFS_INODE_ITEM_KEY:
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ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);
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pr_info("\t\tinode generation %llu size %llu mode %o\n",
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btrfs_inode_generation(l, ii),
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btrfs_inode_size(l, ii),
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btrfs_inode_mode(l, ii));
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break;
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case BTRFS_DIR_ITEM_KEY:
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di = btrfs_item_ptr(l, i, struct btrfs_dir_item);
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btrfs_dir_item_key_to_cpu(l, di, &found_key);
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pr_info("\t\tdir oid %llu flags %u\n",
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found_key.objectid,
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btrfs_dir_flags(l, di));
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break;
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case BTRFS_ROOT_ITEM_KEY:
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ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
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pr_info("\t\troot data bytenr %llu refs %u\n",
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btrfs_disk_root_bytenr(l, ri),
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btrfs_disk_root_refs(l, ri));
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break;
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case BTRFS_EXTENT_ITEM_KEY:
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case BTRFS_METADATA_ITEM_KEY:
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print_extent_item(l, i, type);
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break;
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case BTRFS_TREE_BLOCK_REF_KEY:
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pr_info("\t\ttree block backref\n");
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break;
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case BTRFS_SHARED_BLOCK_REF_KEY:
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pr_info("\t\tshared block backref\n");
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break;
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case BTRFS_EXTENT_DATA_REF_KEY:
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dref = btrfs_item_ptr(l, i,
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struct btrfs_extent_data_ref);
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print_extent_data_ref(l, dref);
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break;
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case BTRFS_SHARED_DATA_REF_KEY:
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sref = btrfs_item_ptr(l, i,
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struct btrfs_shared_data_ref);
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pr_info("\t\tshared data backref count %u\n",
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btrfs_shared_data_ref_count(l, sref));
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break;
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case BTRFS_EXTENT_DATA_KEY:
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fi = btrfs_item_ptr(l, i,
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struct btrfs_file_extent_item);
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if (btrfs_file_extent_type(l, fi) ==
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BTRFS_FILE_EXTENT_INLINE) {
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pr_info("\t\tinline extent data size %llu\n",
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btrfs_file_extent_ram_bytes(l, fi));
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break;
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}
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pr_info("\t\textent data disk bytenr %llu nr %llu\n",
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btrfs_file_extent_disk_bytenr(l, fi),
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btrfs_file_extent_disk_num_bytes(l, fi));
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pr_info("\t\textent data offset %llu nr %llu ram %llu\n",
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btrfs_file_extent_offset(l, fi),
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btrfs_file_extent_num_bytes(l, fi),
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btrfs_file_extent_ram_bytes(l, fi));
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break;
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case BTRFS_BLOCK_GROUP_ITEM_KEY:
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bi = btrfs_item_ptr(l, i,
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struct btrfs_block_group_item);
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pr_info(
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"\t\tblock group used %llu chunk_objectid %llu flags %llu\n",
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btrfs_block_group_used(l, bi),
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btrfs_block_group_chunk_objectid(l, bi),
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btrfs_block_group_flags(l, bi));
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break;
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case BTRFS_CHUNK_ITEM_KEY:
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print_chunk(l, btrfs_item_ptr(l, i,
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struct btrfs_chunk));
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break;
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case BTRFS_DEV_ITEM_KEY:
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print_dev_item(l, btrfs_item_ptr(l, i,
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struct btrfs_dev_item));
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break;
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case BTRFS_DEV_EXTENT_KEY:
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dev_extent = btrfs_item_ptr(l, i,
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struct btrfs_dev_extent);
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pr_info("\t\tdev extent chunk_tree %llu\n\t\tchunk objectid %llu chunk offset %llu length %llu\n",
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btrfs_dev_extent_chunk_tree(l, dev_extent),
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btrfs_dev_extent_chunk_objectid(l, dev_extent),
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btrfs_dev_extent_chunk_offset(l, dev_extent),
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btrfs_dev_extent_length(l, dev_extent));
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break;
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case BTRFS_PERSISTENT_ITEM_KEY:
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pr_info("\t\tpersistent item objectid %llu offset %llu\n",
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key.objectid, key.offset);
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switch (key.objectid) {
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case BTRFS_DEV_STATS_OBJECTID:
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pr_info("\t\tdevice stats\n");
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break;
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default:
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pr_info("\t\tunknown persistent item\n");
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}
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break;
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case BTRFS_TEMPORARY_ITEM_KEY:
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pr_info("\t\ttemporary item objectid %llu offset %llu\n",
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key.objectid, key.offset);
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switch (key.objectid) {
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case BTRFS_BALANCE_OBJECTID:
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pr_info("\t\tbalance status\n");
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break;
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default:
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pr_info("\t\tunknown temporary item\n");
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}
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break;
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case BTRFS_DEV_REPLACE_KEY:
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pr_info("\t\tdev replace\n");
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break;
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case BTRFS_UUID_KEY_SUBVOL:
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case BTRFS_UUID_KEY_RECEIVED_SUBVOL:
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print_uuid_item(l, btrfs_item_ptr_offset(l, i),
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btrfs_item_size(l, i));
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break;
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case BTRFS_RAID_STRIPE_KEY:
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print_raid_stripe_key(l, btrfs_item_size(l, i),
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btrfs_item_ptr(l, i, struct btrfs_stripe_extent));
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break;
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}
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}
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}
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void btrfs_print_tree(const struct extent_buffer *c, bool follow)
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{
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struct btrfs_fs_info *fs_info;
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int i; u32 nr;
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struct btrfs_key key;
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int level;
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if (!c)
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return;
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fs_info = c->fs_info;
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nr = btrfs_header_nritems(c);
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level = btrfs_header_level(c);
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if (level == 0) {
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btrfs_print_leaf(c);
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return;
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}
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btrfs_info(fs_info,
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"node %llu level %d gen %llu total ptrs %d free spc %u owner %llu",
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btrfs_header_bytenr(c), level, btrfs_header_generation(c),
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nr, (u32)BTRFS_NODEPTRS_PER_BLOCK(fs_info) - nr,
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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_tree_parent_check check = {
|
|
.level = level - 1,
|
|
.transid = btrfs_node_ptr_generation(c, i),
|
|
.owner_root = btrfs_header_owner(c),
|
|
.has_first_key = true
|
|
};
|
|
struct extent_buffer *next;
|
|
|
|
btrfs_node_key_to_cpu(c, &check.first_key, i);
|
|
next = read_tree_block(fs_info, btrfs_node_blockptr(c, i), &check);
|
|
if (IS_ERR(next))
|
|
continue;
|
|
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);
|
|
}
|
|
}
|