blob: 50bb986332a59c5166e8000396eace2d1fb670df [file] [log] [blame]
/*
* e2freefrag - report filesystem free-space fragmentation
*
* Copyright (C) 2009 Sun Microsystems, Inc.
*
* Author: Rupesh Thakare <rupesh@sun.com>
* Andreas Dilger <adilger@sun.com>
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License version 2.
* %End-Header%
*/
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#else
extern char *optarg;
extern int optind;
#endif
#include "ext2fs/ext2_fs.h"
#include "ext2fs/ext2fs.h"
#include "e2freefrag.h"
void usage(const char *prog)
{
fprintf(stderr, "usage: %s [-c chunksize in kb] [-h] "
"device_name\n", prog);
exit(1);
}
static int ul_log2(unsigned long arg)
{
int l = 0;
arg >>= 1;
while (arg) {
l++;
arg >>= 1;
}
return l;
}
void init_chunk_info(ext2_filsys fs, struct chunk_info *info)
{
int i;
info->blocksize_bits = ul_log2((unsigned long)fs->blocksize);
if (info->chunkbytes) {
info->chunkbits = ul_log2(info->chunkbytes);
info->blks_in_chunk = info->chunkbytes >> info->blocksize_bits;
} else {
info->chunkbits = ul_log2(DEFAULT_CHUNKSIZE);
info->blks_in_chunk = DEFAULT_CHUNKSIZE >> info->blocksize_bits;
}
info->min = ~0UL;
info->max = info->avg = 0;
info->real_free_chunks = 0;
for (i = 0; i < MAX_HIST; i++) {
info->histogram.fc_chunks[i] = 0;
info->histogram.fc_blocks[i] = 0;
}
}
void update_chunk_stats(struct chunk_info *info, unsigned long chunk_size)
{
unsigned long index;
index = ul_log2(chunk_size) + 1;
if (index >= MAX_HIST)
index = MAX_HIST-1;
info->histogram.fc_chunks[index]++;
info->histogram.fc_blocks[index] += chunk_size;
if (chunk_size > info->max)
info->max = chunk_size;
if (chunk_size < info->min)
info->min = chunk_size;
info->avg += chunk_size;
info->real_free_chunks++;
}
void scan_block_bitmap(ext2_filsys fs, struct chunk_info *info)
{
unsigned long long blocks_count = fs->super->s_blocks_count;
unsigned long long chunks = (blocks_count + info->blks_in_chunk) >>
(info->chunkbits - info->blocksize_bits);
unsigned long long chunk_num;
unsigned long last_chunk_size = 0;
unsigned long long chunk_start_blk = 0;
int used;
for (chunk_num = 0; chunk_num < chunks; chunk_num++) {
unsigned long long blk, num_blks;
int chunk_free;
/* Last chunk may be smaller */
if (chunk_start_blk + info->blks_in_chunk > blocks_count)
num_blks = blocks_count - chunk_start_blk;
else
num_blks = info->blks_in_chunk;
chunk_free = 0;
/* Initialize starting block for first chunk correctly else
* there is a segfault when blocksize = 1024 in which case
* block_map->start = 1 */
for (blk = 0; blk < num_blks; blk++, chunk_start_blk++) {
if (chunk_num == 0 && blk == 0) {
blk = fs->super->s_first_data_block;
chunk_start_blk = blk;
}
used = ext2fs_fast_test_block_bitmap(fs->block_map,
chunk_start_blk);
if (!used) {
last_chunk_size++;
chunk_free++;
}
if (used && last_chunk_size != 0) {
update_chunk_stats(info, last_chunk_size);
last_chunk_size = 0;
}
}
if (chunk_free == info->blks_in_chunk)
info->free_chunks++;
}
if (last_chunk_size != 0)
update_chunk_stats(info, last_chunk_size);
}
errcode_t get_chunk_info(ext2_filsys fs, struct chunk_info *info)
{
unsigned long total_chunks;
char *unitp = "KMGTPEZY";
int units = 10;
unsigned long start = 0, end, cum;
int i, retval = 0;
scan_block_bitmap(fs, info);
printf("Total blocks: %u\nFree blocks: %u (%0.1f%%)\n",
fs->super->s_blocks_count, fs->super->s_free_blocks_count,
(double)fs->super->s_free_blocks_count * 100 /
fs->super->s_blocks_count);
if (info->chunkbytes) {
printf("\nChunksize: %lu bytes (%u blocks)\n",
info->chunkbytes, info->blks_in_chunk);
total_chunks = (fs->super->s_blocks_count +
info->blks_in_chunk) >>
(info->chunkbits - info->blocksize_bits);
printf("Total chunks: %lu\nFree chunks: %lu (%0.1f%%)\n",
total_chunks, info->free_chunks,
(double)info->free_chunks * 100 / total_chunks);
}
/* Display chunk information in KB */
if (info->real_free_chunks) {
info->min = (info->min * fs->blocksize) >> 10;
info->max = (info->max * fs->blocksize) >> 10;
info->avg = (info->avg / info->real_free_chunks *
fs->blocksize) >> 10;
} else {
info->min = 0;
}
printf("\nMin. free extent: %lu KB \nMax. free extent: %lu KB\n"
"Avg. free extent: %lu KB\n", info->min, info->max, info->avg);
printf("Num. free extent: %lu\n", info->real_free_chunks);
printf("\nHISTOGRAM OF FREE EXTENT SIZES:\n");
printf("%s : %12s %12s %7s\n", "Extent Size Range", "Free extents",
"Free Blocks", "Percent");
for (i = 0; i < MAX_HIST; i++) {
end = 1 << (i + info->blocksize_bits - units);
if (info->histogram.fc_chunks[i] != 0) {
char end_str[32];
sprintf(end_str, "%5lu%c-", end, *unitp);
if (i == MAX_HIST-1)
strcpy(end_str, "max ");
printf("%5lu%c...%7s : %12lu %12lu %6.2f%%\n",
start, *unitp, end_str,
info->histogram.fc_chunks[i],
info->histogram.fc_blocks[i],
(double)info->histogram.fc_blocks[i] * 100 /
fs->super->s_free_blocks_count);
}
start = end;
if (start == 1<<10) {
start = 1;
units += 10;
unitp++;
}
}
return retval;
}
void close_device(char *device_name, ext2_filsys fs)
{
int retval = ext2fs_close(fs);
if (retval)
com_err(device_name, retval, "while closing the filesystem.\n");
}
void collect_info(ext2_filsys fs, struct chunk_info *chunk_info)
{
unsigned int retval = 0, i, free_blks;
printf("Device: %s\n", fs->device_name);
printf("Blocksize: %u bytes\n", fs->blocksize);
retval = ext2fs_read_block_bitmap(fs);
if (retval) {
com_err(fs->device_name, retval, "while reading block bitmap");
close_device(fs->device_name, fs);
exit(1);
}
init_chunk_info(fs, chunk_info);
retval = get_chunk_info(fs, chunk_info);
if (retval) {
com_err(fs->device_name, retval, "while collecting chunk info");
close_device(fs->device_name, fs);
exit(1);
}
}
void open_device(char *device_name, ext2_filsys *fs)
{
int retval;
int flag = EXT2_FLAG_FORCE;
retval = ext2fs_open(device_name, flag, 0, 0, unix_io_manager, fs);
if (retval) {
com_err(device_name, retval, "while opening filesystem");
exit(1);
}
}
int main(int argc, char *argv[])
{
struct chunk_info chunk_info = { };
errcode_t retval = 0;
ext2_filsys fs = NULL;
char *device_name;
char *progname;
char *end;
int c;
add_error_table(&et_ext2_error_table);
progname = argv[0];
while ((c = getopt(argc, argv, "c:h")) != EOF) {
switch (c) {
case 'c':
chunk_info.chunkbytes = strtoull(optarg, &end, 0);
if (*end != '\0') {
fprintf(stderr, "%s: bad chunk size '%s'\n",
progname, optarg);
usage(progname);
}
if (chunk_info.chunkbytes &
(chunk_info.chunkbytes - 1)) {
fprintf(stderr, "%s: chunk size must be a "
"power of 2.\n", argv[0]);
usage(progname);
}
chunk_info.chunkbytes *= 1024;
break;
default:
fprintf(stderr, "%s: bad option '%c'\n",
progname, c);
case 'h':
usage(progname);
break;
}
}
if (optind == argc) {
fprintf(stderr, "%s: missing device name.\n", progname);
usage(progname);
}
device_name = argv[optind];
open_device(device_name, &fs);
if (chunk_info.chunkbytes && (chunk_info.chunkbytes < fs->blocksize)) {
fprintf(stderr, "%s: chunksize must be greater than or equal "
"to filesystem blocksize.\n", progname);
exit(1);
}
collect_info(fs, &chunk_info);
close_device(device_name, fs);
return retval;
}