btrfs-progs/btrfs-calc-size.c

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/*
* Copyright (C) 2011 Red Hat. 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.
*/
#define _XOPEN_SOURCE 500
#define _GNU_SOURCE 1
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <zlib.h>
#include "kerncompat.h"
#include "ctree.h"
#include "disk-io.h"
#include "print-tree.h"
#include "transaction.h"
#include "list.h"
#include "version.h"
#include "volumes.h"
#include "utils.h"
static int verbose = 0;
static int no_pretty = 0;
struct root_stats {
u64 total_nodes;
u64 total_leaves;
u64 total_bytes;
u64 total_inline;
int total_levels;
};
struct fs_root {
struct btrfs_key key;
struct btrfs_key *snaps;
};
static int walk_leaf(struct btrfs_root *root, struct btrfs_path *path,
struct root_stats *stat, int find_inline)
{
struct extent_buffer *b = path->nodes[0];
struct btrfs_file_extent_item *fi;
struct btrfs_key found_key;
int i;
stat->total_bytes += root->leafsize;
stat->total_leaves++;
if (!find_inline)
return 0;
for (i = 0; i < btrfs_header_nritems(b); i++) {
btrfs_item_key_to_cpu(b, &found_key, i);
if (found_key.type != BTRFS_EXTENT_DATA_KEY)
continue;
fi = btrfs_item_ptr(b, i, struct btrfs_file_extent_item);
if (btrfs_file_extent_type(b, fi) == BTRFS_FILE_EXTENT_INLINE)
stat->total_inline +=
btrfs_file_extent_inline_item_len(b,
btrfs_item_nr(b, i));
}
return 0;
}
static int walk_nodes(struct btrfs_root *root, struct btrfs_path *path,
struct root_stats *stat, int level, int find_inline)
{
struct extent_buffer *b = path->nodes[level];
int i;
int ret = 0;
stat->total_bytes += root->nodesize;
stat->total_nodes++;
for (i = 0; i < btrfs_header_nritems(b); i++) {
struct extent_buffer *tmp = NULL;
path->slots[level] = i;
if ((level - 1) > 0 || find_inline) {
tmp = read_tree_block(root, btrfs_node_blockptr(b, i),
btrfs_level_size(root, level - 1),
btrfs_node_ptr_generation(b, i));
if (!tmp) {
fprintf(stderr, "Failed to read blocknr %Lu\n",
btrfs_node_blockptr(b, i));
continue;
}
path->nodes[level - 1] = tmp;
}
if (level - 1)
ret = walk_nodes(root, path, stat, level - 1,
find_inline);
else
ret = walk_leaf(root, path, stat, find_inline);
free_extent_buffer(tmp);
if (ret) {
fprintf(stderr, "Error walking down path\n");
break;
}
}
return ret;
}
static int calc_root_size(struct btrfs_root *tree_root, struct btrfs_key *key,
int find_inline)
{
struct btrfs_root *root;
struct btrfs_path *path;
struct root_stats stat;
int level;
int ret = 0;
int size_fail = 0;
root = btrfs_read_fs_root(tree_root->fs_info, key);
if (!root) {
fprintf(stderr, "Failed to read root %Lu\n", key->objectid);
return 1;
}
path = btrfs_alloc_path();
if (!path) {
fprintf(stderr, "Could not allocate path\n");
return 1;
}
memset(&stat, 0, sizeof(stat));
level = btrfs_header_level(root->node);
path->nodes[level] = root->node;
if (!level) {
ret = walk_leaf(root, path, &stat, find_inline);
if (ret)
goto out;
goto out_print;
}
ret = walk_nodes(root, path, &stat, level, find_inline);
if (ret)
goto out;
out_print:
if (no_pretty || size_fail) {
printf("\t%Lu total bytes, %Lu inline data bytes, %Lu nodes, "
"%Lu leaves, %d levels\n", stat.total_bytes,
stat.total_inline, stat.total_nodes, stat.total_leaves,
level + 1);
} else {
char *total_size;
char *inline_size;
total_size = pretty_sizes(stat.total_bytes);
inline_size = pretty_sizes(stat.total_inline);
printf("\t%s total size, %s inline data, %Lu nodes, "
"%Lu leaves, %d levels\n",
total_size, inline_size, stat.total_nodes,
stat.total_leaves, level + 1);
free(total_size);
free(inline_size);
}
out:
btrfs_free_path(path);
return ret;
}
static void usage()
{
fprintf(stderr, "Usage: calc-size [-v] [-b] <device>\n");
}
int main(int argc, char **argv)
{
struct btrfs_key key;
struct fs_root *roots;
struct btrfs_root *root;
size_t fs_roots_size = sizeof(struct fs_root);
int opt;
int ret = 0;
while ((opt = getopt(argc, argv, "vb")) != -1) {
switch (opt) {
case 'v':
verbose++;
break;
case 'b':
no_pretty = 1;
break;
default:
usage();
exit(1);
}
}
if (optind >= argc) {
usage();
exit(1);
}
/*
if ((ret = check_mounted(argv[optind])) < 0) {
fprintf(stderr, "Could not check mount status: %d\n", ret);
if (ret == -EACCES)
fprintf(stderr, "Maybe you need to run as root?\n");
return ret;
} else if (ret) {
fprintf(stderr, "%s is currently mounted. Aborting.\n",
argv[optind]);
return -EBUSY;
}
*/
root = open_ctree(argv[optind], 0, 0);
if (!root) {
fprintf(stderr, "Couldn't open ctree\n");
exit(1);
}
roots = malloc(fs_roots_size);
if (!roots) {
fprintf(stderr, "No memory\n");
goto out;
}
printf("Calculating size of root tree\n");
key.objectid = BTRFS_ROOT_TREE_OBJECTID;
ret = calc_root_size(root, &key, 0);
if (ret)
goto out;
printf("Calculating size of extent tree\n");
key.objectid = BTRFS_EXTENT_TREE_OBJECTID;
ret = calc_root_size(root, &key, 0);
if (ret)
goto out;
printf("Calculating size of csum tree\n");
key.objectid = BTRFS_CSUM_TREE_OBJECTID;
ret = calc_root_size(root, &key, 0);
if (ret)
goto out;
roots[0].key.objectid = BTRFS_FS_TREE_OBJECTID;
roots[0].key.offset = (u64)-1;
printf("Calculatin' size of fs tree\n");
ret = calc_root_size(root, &roots[0].key, 1);
if (ret)
goto out;
out:
close_ctree(root);
return ret;
}