print-tree.c

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/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#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;
    printk(KERN_INFO "\t\tchunk length %llu owner %llu type %llu "
           "num_stripes %d\n",
           (unsigned long long)btrfs_chunk_length(eb, chunk),
           (unsigned long long)btrfs_chunk_owner(eb, chunk),
           (unsigned long long)btrfs_chunk_type(eb, chunk),
           num_stripes);
    for (i = 0 ; i < num_stripes ; i++) {
        printk(KERN_INFO "\t\t\tstripe %d devid %llu offset %llu\n", i,
              (unsigned long long)btrfs_stripe_devid_nr(eb, chunk, i),
              (unsigned long long)btrfs_stripe_offset_nr(eb, chunk, i));
    }
}
static void print_dev_item(struct extent_buffer *eb,
               struct btrfs_dev_item *dev_item)
{
    printk(KERN_INFO "\t\tdev item devid %llu "
           "total_bytes %llu bytes used %llu\n",
           (unsigned long long)btrfs_device_id(eb, dev_item),
           (unsigned long long)btrfs_device_total_bytes(eb, dev_item),
           (unsigned long long)btrfs_device_bytes_used(eb, dev_item));
}
static void print_extent_data_ref(struct extent_buffer *eb,
                  struct btrfs_extent_data_ref *ref)
{
    printk(KERN_INFO "\t\textent data backref root %llu "
           "objectid %llu offset %llu count %u\n",
           (unsigned long long)btrfs_extent_data_ref_root(eb, ref),
           (unsigned long long)btrfs_extent_data_ref_objectid(eb, ref),
           (unsigned long long)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)
{
    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;
    int type;
    u32 item_size = btrfs_item_size_nr(eb, slot);
    u64 flags;
    u64 offset;

    if (item_size < sizeof(*ei)) {
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
        struct btrfs_extent_item_v0 *ei0;
        BUG_ON(item_size != sizeof(*ei0));
        ei0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_item_v0);
        printk(KERN_INFO "\t\textent refs %u\n",
               btrfs_extent_refs_v0(eb, ei0));
        return;
#else
        BUG();
#endif
    }

    ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
    flags = btrfs_extent_flags(eb, ei);

    printk(KERN_INFO "\t\textent refs %llu gen %llu flags %llu\n",
           (unsigned long long)btrfs_extent_refs(eb, ei),
           (unsigned long long)btrfs_extent_generation(eb, ei),
           (unsigned long long)flags);

    if (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);
        printk(KERN_INFO "\t\ttree block key (%llu %x %llu) "
               "level %d\n",
               (unsigned long long)btrfs_disk_key_objectid(&key),
               key.type,
               (unsigned long long)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);
        switch (type) {
        case BTRFS_TREE_BLOCK_REF_KEY:
            printk(KERN_INFO "\t\ttree block backref "
                "root %llu\n", (unsigned long long)offset);
            break;
        case BTRFS_SHARED_BLOCK_REF_KEY:
            printk(KERN_INFO "\t\tshared block backref "
                "parent %llu\n", (unsigned long long)offset);
            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);
            printk(KERN_INFO "\t\tshared data backref "
                   "parent %llu count %u\n",
                   (unsigned long long)offset,
                   btrfs_shared_data_ref_count(eb, sref));
            break;
        default:
            BUG();
        }
        ptr += btrfs_extent_inline_ref_size(type);
    }
    WARN_ON(ptr > end);
}

#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
static void print_extent_ref_v0(struct extent_buffer *eb, int slot)
{
    struct btrfs_extent_ref_v0 *ref0;

    ref0 = btrfs_item_ptr(eb, slot, struct btrfs_extent_ref_v0);
    printk("\t\textent back ref root %llu gen %llu "
        "owner %llu num_refs %lu\n",
        (unsigned long long)btrfs_ref_root_v0(eb, ref0),
        (unsigned long long)btrfs_ref_generation_v0(eb, ref0),
        (unsigned long long)btrfs_ref_objectid_v0(eb, ref0),
        (unsigned long)btrfs_ref_count_v0(eb, ref0));
}
#endif

void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
{
    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;

    nr = btrfs_header_nritems(l);

    printk(KERN_INFO "leaf %llu total ptrs %d free space %d\n",
        (unsigned long long)btrfs_header_bytenr(l), nr,
        btrfs_leaf_free_space(root, l));
    for (i = 0 ; i < nr ; i++) {
        item = btrfs_item_nr(l, i);
        btrfs_item_key_to_cpu(l, &key, i);
        type = btrfs_key_type(&key);
        printk(KERN_INFO "\titem %d key (%llu %x %llu) itemoff %d "
               "itemsize %d\n",
            i,
            (unsigned long long)key.objectid, type,
            (unsigned long long)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);
            printk(KERN_INFO "\t\tinode generation %llu size %llu "
                   "mode %o\n",
                   (unsigned long long)
                   btrfs_inode_generation(l, ii),
                  (unsigned long long)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);
            printk(KERN_INFO "\t\tdir oid %llu type %u\n",
                (unsigned long long)found_key.objectid,
                btrfs_dir_type(l, di));
            break;
        case BTRFS_ROOT_ITEM_KEY:
            ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
            printk(KERN_INFO "\t\troot data bytenr %llu refs %u\n",
                (unsigned long long)
                btrfs_disk_root_bytenr(l, ri),
                btrfs_disk_root_refs(l, ri));
            break;
        case BTRFS_EXTENT_ITEM_KEY:
            print_extent_item(l, i);
            break;
        case BTRFS_TREE_BLOCK_REF_KEY:
            printk(KERN_INFO "\t\ttree block backref\n");
            break;
        case BTRFS_SHARED_BLOCK_REF_KEY:
            printk(KERN_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);
            printk(KERN_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) {
                printk(KERN_INFO "\t\tinline extent data "
                       "size %u\n",
                       btrfs_file_extent_inline_len(l, fi));
                break;
            }
            printk(KERN_INFO "\t\textent data disk bytenr %llu "
                   "nr %llu\n",
                   (unsigned long long)
                   btrfs_file_extent_disk_bytenr(l, fi),
                   (unsigned long long)
                   btrfs_file_extent_disk_num_bytes(l, fi));
            printk(KERN_INFO "\t\textent data offset %llu "
                   "nr %llu ram %llu\n",
                   (unsigned long long)
                   btrfs_file_extent_offset(l, fi),
                   (unsigned long long)
                   btrfs_file_extent_num_bytes(l, fi),
                   (unsigned long long)
                   btrfs_file_extent_ram_bytes(l, fi));
            break;
        case BTRFS_EXTENT_REF_V0_KEY:
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
            print_extent_ref_v0(l, i);
#else
            BUG();
#endif
            break;
        case BTRFS_BLOCK_GROUP_ITEM_KEY:
            bi = btrfs_item_ptr(l, i,
                        struct btrfs_block_group_item);
            printk(KERN_INFO "\t\tblock group used %llu\n",
                   (unsigned long long)
                   btrfs_disk_block_group_used(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);
            printk(KERN_INFO "\t\tdev extent chunk_tree %llu\n"
                   "\t\tchunk objectid %llu chunk offset %llu "
                   "length %llu\n",
                   (unsigned long long)
                   btrfs_dev_extent_chunk_tree(l, dev_extent),
                   (unsigned long long)
                   btrfs_dev_extent_chunk_objectid(l, dev_extent),
                   (unsigned long long)
                   btrfs_dev_extent_chunk_offset(l, dev_extent),
                   (unsigned long long)
                   btrfs_dev_extent_length(l, dev_extent));
        case BTRFS_DEV_STATS_KEY:
            printk(KERN_INFO "\t\tdevice stats\n");
            break;
        };
    }
}

void btrfs_print_tree(struct btrfs_root *root, struct extent_buffer *c)
{
    int i; u32 nr;
    struct btrfs_key key;
    int level;

    if (!c)
        return;
    nr = btrfs_header_nritems(c);
    level = btrfs_header_level(c);
    if (level == 0) {
        btrfs_print_leaf(root, c);
        return;
    }
    printk(KERN_INFO "node %llu level %d total ptrs %d free spc %u\n",
           (unsigned long long)btrfs_header_bytenr(c),
          level, nr,
           (u32)BTRFS_NODEPTRS_PER_BLOCK(root) - nr);
    for (i = 0; i < nr; i++) {
        btrfs_node_key_to_cpu(c, &key, i);
        printk(KERN_INFO "\tkey %d (%llu %u %llu) block %llu\n",
               i,
               (unsigned long long)key.objectid,
               key.type,
               (unsigned long long)key.offset,
               (unsigned long long)btrfs_node_blockptr(c, i));
    }
    for (i = 0; i < nr; i++) {
        struct extent_buffer *next = read_tree_block(root,
                    btrfs_node_blockptr(c, i),
                    btrfs_level_size(root, level - 1),
                    btrfs_node_ptr_generation(c, i));
        if (btrfs_is_leaf(next) &&
           level != 1)
            BUG();
        if (btrfs_header_level(next) !=
               level - 1)
            BUG();
        btrfs_print_tree(root, next);
        free_extent_buffer(next);
    }
}