mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-18 04:15:32 +00:00
424 lines
11 KiB
C
424 lines
11 KiB
C
#define _XOPEN_SOURCE 500
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include "kerncompat.h"
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#include "radix-tree.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 "transaction.h"
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#include "bit-radix.h"
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u64 blocks_used = 0;
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struct extent_record {
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struct btrfs_disk_key parent_key;
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struct btrfs_disk_key node_key;
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u64 start;
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u64 nr;
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u64 owner;
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u32 refs;
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u32 extent_item_refs;
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};
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static int check_node(struct btrfs_root *root,
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struct btrfs_disk_key *parent_key,
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struct btrfs_node *node)
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{
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int i;
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u32 nritems = btrfs_header_nritems(&node->header);
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if (nritems == 0 || nritems > BTRFS_NODEPTRS_PER_BLOCK(root))
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return 1;
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if (parent_key->flags) {
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if (memcmp(parent_key, &node->ptrs[0].key,
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sizeof(struct btrfs_disk_key)))
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return 1;
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}
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for (i = 0; nritems > 1 && i < nritems - 2; i++) {
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struct btrfs_key cpukey;
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btrfs_disk_key_to_cpu(&cpukey, &node->ptrs[i + 1].key);
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if (btrfs_comp_keys(&node->ptrs[i].key, &cpukey) >= 0)
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return 1;
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}
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return 0;
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}
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static int check_leaf(struct btrfs_root *root,
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struct btrfs_disk_key *parent_key,
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struct btrfs_leaf *leaf)
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{
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int i;
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u32 nritems = btrfs_header_nritems(&leaf->header);
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if (btrfs_header_level(&leaf->header) != 0) {
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fprintf(stderr, "leaf is not a leaf %Lu\n",
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btrfs_header_blocknr(&leaf->header));
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return 1;
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}
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if (btrfs_leaf_free_space(root, leaf) < 0) {
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fprintf(stderr, "leaf free space incorrect %Lu %d\n",
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btrfs_header_blocknr(&leaf->header),
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btrfs_leaf_free_space(root, leaf));
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return 1;
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}
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if (nritems == 0)
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return 0;
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if (parent_key->flags) {
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if (memcmp(parent_key, &leaf->items[0].key,
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sizeof(struct btrfs_disk_key))) {
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fprintf(stderr, "leaf parent key incorrect %Lu\n",
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btrfs_header_blocknr(&leaf->header));
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return 1;
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}
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}
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for (i = 0; nritems > 1 && i < nritems - 2; i++) {
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struct btrfs_key cpukey;
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btrfs_disk_key_to_cpu(&cpukey, &leaf->items[i + 1].key);
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if (btrfs_comp_keys(&leaf->items[i].key,
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&cpukey) >= 0)
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return 1;
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if (btrfs_item_offset(leaf->items + i) !=
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btrfs_item_end(leaf->items + i + 1))
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return 1;
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if (i == 0) {
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if (btrfs_item_offset(leaf->items + i) +
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btrfs_item_size(leaf->items + i) !=
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BTRFS_LEAF_DATA_SIZE(root))
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return 1;
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}
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}
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return 0;
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}
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static int check_block(struct btrfs_root *root,
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struct radix_tree_root *extent_radix,
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struct btrfs_buffer *buf)
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{
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struct extent_record *rec;
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rec = radix_tree_lookup(extent_radix, buf->blocknr);
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if (!rec)
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return 1;
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if (btrfs_is_leaf(&buf->node)) {
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return check_leaf(root, &rec->parent_key, &buf->leaf);
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} else {
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return check_node(root, &rec->parent_key, &buf->node);
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}
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return 1;
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}
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static int add_extent_rec(struct radix_tree_root *extent_radix,
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struct btrfs_disk_key *parent_key,
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u64 ref, u64 start, u64 nr, u64 owner,
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u32 extent_item_refs, int inc_ref)
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{
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struct extent_record *rec;
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int ret = 0;
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rec = radix_tree_lookup(extent_radix, start);
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if (rec) {
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if (inc_ref)
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rec->refs++;
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if (start != rec->start) {
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fprintf(stderr, "warning, start mismatch %Lu %Lu\n",
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rec->start, start);
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ret = 1;
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}
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if (extent_item_refs)
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rec->extent_item_refs = extent_item_refs;
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return ret;
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}
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rec = malloc(sizeof(*rec));
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if (start == 0)
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extent_item_refs = 0;
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rec->start = start;
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rec->nr = nr;
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rec->owner = owner;
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if (inc_ref)
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rec->refs = 1;
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else
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rec->refs = 0;
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if (extent_item_refs)
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rec->extent_item_refs = extent_item_refs;
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else
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rec->extent_item_refs = 0;
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if (parent_key)
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memcpy(&rec->parent_key, parent_key, sizeof(*parent_key));
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else
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memset(&rec->parent_key, 0, sizeof(*parent_key));
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ret = radix_tree_insert(extent_radix, start, rec);
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BUG_ON(ret);
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blocks_used += nr;
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return ret;
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}
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static int add_pending(struct radix_tree_root *pending,
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struct radix_tree_root *seen, u64 blocknr)
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{
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if (test_radix_bit(seen, blocknr))
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return -EEXIST;
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set_radix_bit(pending, blocknr);
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set_radix_bit(seen, blocknr);
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return 0;
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}
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static int pick_next_pending(struct radix_tree_root *pending,
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struct radix_tree_root *reada,
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struct radix_tree_root *nodes,
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u64 last, unsigned long *bits, int bits_nr)
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{
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unsigned long node_start = last;
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int ret;
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ret = find_first_radix_bit(reada, bits, 0, 1);
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if (ret && ret > 16)
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return ret;
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if (node_start > 8)
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node_start -= 8;
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ret = find_first_radix_bit(nodes, bits, node_start, bits_nr);
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if (!ret)
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ret = find_first_radix_bit(nodes, bits, 0, bits_nr);
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if (ret)
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return ret;
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return find_first_radix_bit(pending, bits, 0, bits_nr);
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}
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static struct btrfs_buffer reada_buf;
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static int run_next_block(struct btrfs_root *root,
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unsigned long *bits,
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int bits_nr,
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u64 *last,
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struct radix_tree_root *pending,
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struct radix_tree_root *seen,
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struct radix_tree_root *reada,
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struct radix_tree_root *nodes,
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struct radix_tree_root *extent_radix)
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{
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struct btrfs_buffer *buf;
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u64 blocknr;
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int ret;
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int i;
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int nritems;
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struct btrfs_leaf *leaf;
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struct btrfs_node *node;
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u64 last_block = 0;
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ret = pick_next_pending(pending, reada, nodes, *last, bits, bits_nr);
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if (ret == 0) {
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return 1;
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}
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for(i = 0; i < ret; i++) {
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u64 offset;
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if (test_radix_bit(reada, bits[i]))
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continue;
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set_radix_bit(reada, bits[i]);
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btrfs_map_bh_to_logical(root, &reada_buf, bits[i]);
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offset = reada_buf.dev_blocknr * root->blocksize;
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last_block = bits[i];
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readahead(reada_buf.fd, offset, root->blocksize);
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}
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*last = bits[0];
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blocknr = bits[0];
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clear_radix_bit(pending, blocknr);
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clear_radix_bit(reada, blocknr);
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clear_radix_bit(nodes, blocknr);
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buf = read_tree_block(root, blocknr);
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nritems = btrfs_header_nritems(&buf->node.header);
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ret = check_block(root, extent_radix, buf);
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if (ret) {
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fprintf(stderr, "bad block %Lu\n", blocknr);
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}
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if (btrfs_is_leaf(&buf->node)) {
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leaf = &buf->leaf;
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for (i = 0; i < nritems; i++) {
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struct btrfs_file_extent_item *fi;
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if (btrfs_disk_key_type(&leaf->items[i].key) ==
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BTRFS_EXTENT_ITEM_KEY) {
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struct btrfs_key found;
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struct btrfs_extent_item *ei;
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btrfs_disk_key_to_cpu(&found,
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&leaf->items[i].key);
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ei = btrfs_item_ptr(leaf, i,
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struct btrfs_extent_item);
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add_extent_rec(extent_radix, NULL, 0,
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found.objectid,
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found.offset,
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btrfs_extent_owner(ei),
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btrfs_extent_refs(ei), 0);
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continue;
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}
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if (btrfs_disk_key_type(&leaf->items[i].key) !=
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BTRFS_EXTENT_DATA_KEY)
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continue;
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fi = btrfs_item_ptr(leaf, i,
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struct btrfs_file_extent_item);
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if (btrfs_file_extent_type(fi) !=
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BTRFS_FILE_EXTENT_REG)
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continue;
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ret = add_extent_rec(extent_radix, NULL, blocknr,
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btrfs_file_extent_disk_blocknr(fi),
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btrfs_file_extent_disk_num_blocks(fi),
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btrfs_disk_key_objectid(&leaf->items[i].key),
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0, 1);
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BUG_ON(ret);
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}
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} else {
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int level;
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node = &buf->node;
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level = btrfs_header_level(&node->header);
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for (i = 0; i < nritems; i++) {
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u64 ptr = btrfs_node_blockptr(node, i);
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ret = add_extent_rec(extent_radix,
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&node->ptrs[i].key,
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blocknr, ptr, 1,
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btrfs_header_owner(&node->header),
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0, 1);
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BUG_ON(ret);
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if (level > 1) {
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add_pending(nodes, seen, ptr);
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} else {
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add_pending(pending, seen, ptr);
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}
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}
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}
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btrfs_block_release(root, buf);
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return 0;
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}
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static int add_root_to_pending(struct btrfs_buffer *buf,
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unsigned long *bits,
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int bits_nr,
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struct radix_tree_root *extent_radix,
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struct radix_tree_root *pending,
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struct radix_tree_root *seen,
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struct radix_tree_root *reada,
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struct radix_tree_root *nodes)
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{
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if (btrfs_header_level(&buf->node.header) > 0)
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add_pending(nodes, seen, buf->blocknr);
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else
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add_pending(pending, seen, buf->blocknr);
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add_extent_rec(extent_radix, NULL, 0, buf->blocknr, 1,
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btrfs_header_owner(&buf->node.header), 0, 1);
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return 0;
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}
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int check_extent_refs(struct btrfs_root *root,
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struct radix_tree_root *extent_radix)
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{
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struct extent_record *rec[64];
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int i;
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int ret;
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int err = 0;
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while(1) {
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ret = radix_tree_gang_lookup(extent_radix, (void **)rec, 0,
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ARRAY_SIZE(rec));
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if (!ret)
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break;
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for (i = 0; i < ret; i++) {
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if (rec[i]->refs != rec[i]->extent_item_refs) {
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fprintf(stderr, "ref mismatch on [%Lu %Lu] ",
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rec[i]->start, rec[i]->nr);
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fprintf(stderr, "extent item %u, found %u\n",
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rec[i]->extent_item_refs,
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rec[i]->refs);
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err = 1;
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}
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radix_tree_delete(extent_radix, rec[i]->start);
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free(rec[i]);
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}
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}
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return err;
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}
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int main(int ac, char **av) {
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struct btrfs_super_block super;
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struct btrfs_root *root;
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struct radix_tree_root extent_radix;
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struct radix_tree_root seen;
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struct radix_tree_root pending;
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struct radix_tree_root reada;
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struct radix_tree_root nodes;
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struct btrfs_path path;
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struct btrfs_key key;
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struct btrfs_key found_key;
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int ret;
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u64 last = 0;
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unsigned long *bits;
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int bits_nr;
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struct btrfs_leaf *leaf;
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int slot;
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struct btrfs_root_item *ri;
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radix_tree_init();
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INIT_RADIX_TREE(&extent_radix, GFP_NOFS);
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init_bit_radix(&seen);
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init_bit_radix(&pending);
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init_bit_radix(&reada);
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init_bit_radix(&nodes);
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root = open_ctree(av[1], &super);
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bits_nr = 1024 * 1024 / root->blocksize;
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bits = malloc(bits_nr * sizeof(unsigned long));
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if (!bits) {
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perror("malloc");
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exit(1);
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}
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add_root_to_pending(root->fs_info->tree_root->node, bits, bits_nr,
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&extent_radix, &pending, &seen, &reada, &nodes);
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add_root_to_pending(root->fs_info->dev_root->node, bits, bits_nr,
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&extent_radix, &pending, &seen, &reada, &nodes);
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btrfs_init_path(&path);
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key.offset = 0;
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key.objectid = 0;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
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ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
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&key, &path, 0, 0);
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BUG_ON(ret < 0);
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while(1) {
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leaf = &path.nodes[0]->leaf;
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slot = path.slots[0];
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if (slot >= btrfs_header_nritems(&leaf->header)) {
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ret = btrfs_next_leaf(root, &path);
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if (ret != 0)
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break;
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leaf = &path.nodes[0]->leaf;
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slot = path.slots[0];
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}
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btrfs_disk_key_to_cpu(&found_key,
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&leaf->items[path.slots[0]].key);
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if (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) {
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struct btrfs_buffer *buf;
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ri = btrfs_item_ptr(leaf, path.slots[0],
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struct btrfs_root_item);
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buf = read_tree_block(root->fs_info->tree_root,
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btrfs_root_blocknr(ri));
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add_root_to_pending(buf, bits, bits_nr, &extent_radix,
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&pending, &seen, &reada, &nodes);
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btrfs_block_release(root->fs_info->tree_root, buf);
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}
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path.slots[0]++;
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}
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btrfs_release_path(root, &path);
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while(1) {
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ret = run_next_block(root, bits, bits_nr, &last, &pending,
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&seen, &reada, &nodes, &extent_radix);
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if (ret != 0)
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break;
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}
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ret = check_extent_refs(root, &extent_radix);
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close_ctree(root, &super);
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printf("found %Lu blocks used err is %d\n", blocks_used, ret);
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return ret;
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}
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