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btrfs-progs
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btrfs-progs/btrfs-fragments.c

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/*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <uuid/uuid.h>
#include <ctype.h>
#include <gd.h>
#undef ULONG_MAX
#include "kerncompat.h"
#include "ctree.h"
#include "ioctl.h"
#include "common/utils.h"
static int use_color;
static void
push_im(gdImagePtr im, char *name, char *dir)
{
char fullname[2000];
FILE *pngout;
if (!im)
return;
snprintf(fullname, sizeof(fullname), "%s/%s", dir, name);
pngout = fopen(fullname, "w");
if (!pngout) {
printf("unable to create file %s\n", fullname);
exit(1);
}
gdImagePng(im, pngout);
fclose(pngout);
gdImageDestroy(im);
}
static char *
chunk_type(u64 flags)
{
switch (flags & (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_DATA |
BTRFS_BLOCK_GROUP_METADATA)) {
case BTRFS_BLOCK_GROUP_SYSTEM:
return "system";
case BTRFS_BLOCK_GROUP_DATA:
return "data";
case BTRFS_BLOCK_GROUP_METADATA:
return "metadata";
case BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA:
return "mixed";
default:
return "invalid";
}
}
static void
print_bg(FILE *html, char *name, u64 start, u64 len, u64 used, u64 flags,
u64 areas)
{
double frag = (double)areas / (len / 4096) * 2;
fprintf(html, "<p>%s chunk starts at %llu, size is %s, %.2f%% used, "
"%.2f%% fragmented</p>\n", chunk_type(flags), start,
pretty_size(len), 100.0 * used / len, 100.0 * frag);
fprintf(html, "<img src=\"%s\" border=\"1\" />\n", name);
}
enum tree_colors {
COLOR_ROOT = 0,
COLOR_EXTENT,
COLOR_CHUNK,
COLOR_DEV,
COLOR_FS,
COLOR_CSUM,
COLOR_RELOC,
COLOR_DATA,
COLOR_UNKNOWN,
COLOR_MAX
};
static int
get_color(struct btrfs_extent_item *item, int len)
{
u64 refs;
u64 flags;
u8 type;
u64 offset;
struct btrfs_extent_inline_ref *ref;
refs = btrfs_stack_extent_refs(item);
flags = btrfs_stack_extent_flags(item);
if (flags & BTRFS_EXTENT_FLAG_DATA)
return COLOR_DATA;
if (refs > 1) {
/* this must be an fs tree */
return COLOR_FS;
}
ref = (void *)item + sizeof(struct btrfs_extent_item) +
sizeof(struct btrfs_tree_block_info);
type = btrfs_stack_extent_inline_ref_type(ref);
offset = btrfs_stack_extent_inline_ref_offset(ref);
switch (type) {
case BTRFS_EXTENT_DATA_REF_KEY:
return COLOR_DATA;
case BTRFS_SHARED_BLOCK_REF_KEY:
case BTRFS_SHARED_DATA_REF_KEY:
return COLOR_FS;
case BTRFS_TREE_BLOCK_REF_KEY:
break;
default:
return COLOR_UNKNOWN;
}
switch (offset) {
case BTRFS_ROOT_TREE_OBJECTID:
return COLOR_ROOT;
case BTRFS_EXTENT_TREE_OBJECTID:
return COLOR_EXTENT;
case BTRFS_CHUNK_TREE_OBJECTID:
return COLOR_CHUNK;
case BTRFS_DEV_TREE_OBJECTID:
return COLOR_DEV;
case BTRFS_FS_TREE_OBJECTID:
return COLOR_FS;
case BTRFS_CSUM_TREE_OBJECTID:
return COLOR_CSUM;
case BTRFS_DATA_RELOC_TREE_OBJECTID:
return COLOR_RELOC;
}
return COLOR_UNKNOWN;
}
static void
init_colors(gdImagePtr im, int *colors)
{
colors[COLOR_ROOT] = gdImageColorAllocate(im, 255, 0, 0);
colors[COLOR_EXTENT] = gdImageColorAllocate(im, 0, 255, 0);
colors[COLOR_CHUNK] = gdImageColorAllocate(im, 255, 0, 0);
colors[COLOR_DEV] = gdImageColorAllocate(im, 255, 0, 0);
colors[COLOR_FS] = gdImageColorAllocate(im, 0, 0, 0);
colors[COLOR_CSUM] = gdImageColorAllocate(im, 0, 0, 255);
colors[COLOR_RELOC] = gdImageColorAllocate(im, 128, 128, 128);
colors[COLOR_DATA] = gdImageColorAllocate(im, 100, 0, 0);
colors[COLOR_UNKNOWN] = gdImageColorAllocate(im, 50, 50, 50);
}
int
list_fragments(int fd, u64 flags, char *dir)
{
int ret;
struct btrfs_ioctl_search_args args;
struct btrfs_ioctl_search_key *sk = &args.key;
int i;
struct btrfs_ioctl_search_header *sh;
unsigned long off = 0;
int bgnum = 0;
u64 bgstart = 0;
u64 bglen = 0;
u64 bgend = 0;
u64 bgflags = 0;
u64 bgused = 0;
u64 saved_extent = 0;
u64 saved_len = 0;
int saved_color = 0;
u64 last_end = 0;
u64 areas = 0;
long px;
char name[1000];
FILE *html;
int colors[COLOR_MAX];
gdImagePtr im = NULL;
int black = 0;
int width = 800;
snprintf(name, sizeof(name), "%s/index.html", dir);
html = fopen(name, "w");
if (!html) {
printf("unable to create %s\n", name);
exit(1);
}
fprintf(html, "<html><header>\n");
fprintf(html, "<title>Btrfs Block Group Allocation Map</title>\n");
fprintf(html, "<style type=\"text/css\">\n");
fprintf(html, "img {margin-left: 1em; margin-bottom: 2em;}\n");
fprintf(html, "</style>\n");
fprintf(html, "</header><body>\n");
memset(&args, 0, sizeof(args));
sk->tree_id = BTRFS_EXTENT_TREE_OBJECTID;
sk->max_type = -1;
sk->min_type = 0;
sk->max_objectid = (u64)-1;
sk->max_offset = (u64)-1;
sk->max_transid = (u64)-1;
/* just a big number, doesn't matter much */
sk->nr_items = 4096;
while(1) {
ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
if (ret < 0) {
fprintf(stderr, "ERROR: can't perform the search\n");
goto out_close;
}
/* the ioctl returns the number of item it found in nr_items */
if (sk->nr_items == 0)
break;
off = 0;
for (i = 0; i < sk->nr_items; i++) {
int j;
sh = (struct btrfs_ioctl_search_header *)(args.buf +
off);
off += sizeof(*sh);
if (btrfs_search_header_type(sh)
== BTRFS_BLOCK_GROUP_ITEM_KEY) {
struct btrfs_block_group_item *bg;
if (im) {
push_im(im, name, dir);
im = NULL;
print_bg(html, name, bgstart, bglen,
bgused, bgflags, areas);
}
++bgnum;
bg = (struct btrfs_block_group_item *)
(args.buf + off);
bgflags = btrfs_block_group_flags(bg);
bgused = btrfs_block_group_used(bg);
printf("found block group %llu len %llu "
"flags %llu\n",
btrfs_search_header_objectid(sh),
btrfs_search_header_offset(sh),
bgflags);
if (!(bgflags & flags)) {
/* skip this block group */
sk->min_objectid =
btrfs_search_header_objectid(sh) +
btrfs_search_header_offset(sh);
sk->min_type = 0;
sk->min_offset = 0;
break;
}
im = gdImageCreate(width,
(btrfs_search_header_offset(sh)
/ 4096 + 799) / width);
black = gdImageColorAllocate(im, 0, 0, 0);
for (j = 0; j < ARRAY_SIZE(colors); ++j)
colors[j] = black;
init_colors(im, colors);
bgstart = btrfs_search_header_objectid(sh);
bglen = btrfs_search_header_offset(sh);
bgend = bgstart + bglen;
snprintf(name, sizeof(name), "bg%d.png", bgnum);
last_end = bgstart;
if (saved_len) {
px = (saved_extent - bgstart) / 4096;
for (j = 0; j < saved_len / 4096; ++j) {
int x = (px + j) % width;
int y = (px + j) / width;
gdImageSetPixel(im, x, y,
saved_color);
}
last_end += saved_len;
}
areas = 0;
saved_len = 0;
}
if (im && btrfs_search_header_type(sh)
== BTRFS_EXTENT_ITEM_KEY) {
int c;
struct btrfs_extent_item *item;
item = (struct btrfs_extent_item *)
(args.buf + off);
if (use_color)
c = colors[get_color(item,
btrfs_search_header_len(sh))];
else
c = black;
if (btrfs_search_header_objectid(sh) > bgend) {
printf("WARN: extent %llu is without "
"block group\n",
btrfs_search_header_objectid(sh));
goto skip;
}
if (btrfs_search_header_objectid(sh) == bgend) {
saved_extent =
btrfs_search_header_objectid(sh);
saved_len =
btrfs_search_header_offset(sh);
saved_color = c;
goto skip;
}
px = (btrfs_search_header_objectid(sh)
- bgstart) / 4096;
for (j = 0;
j < btrfs_search_header_offset(sh) / 4096;
++j) {
int x = (px + j) % width;
int y = (px + j) / width;
gdImageSetPixel(im, x, y, c);
}
if (btrfs_search_header_objectid(sh) != last_end)
++areas;
last_end = btrfs_search_header_objectid(sh)
+ btrfs_search_header_offset(sh);
skip:;
}
off += btrfs_search_header_len(sh);
/*
* record the mins in sk so we can make sure the
* next search doesn't repeat this root
*/
sk->min_objectid = btrfs_search_header_objectid(sh);
sk->min_type = btrfs_search_header_type(sh);
sk->min_offset = btrfs_search_header_offset(sh);
}
sk->nr_items = 4096;
/* increment by one */
if (++sk->min_offset == 0)
if (++sk->min_type == 0)
if (++sk->min_objectid == 0)
break;
}
if (im) {
push_im(im, name, dir);
print_bg(html, name, bgstart, bglen, bgused, bgflags, areas);
}
if (use_color) {
fprintf(html, "<p>");
fprintf(html, "data - dark red, ");
fprintf(html, "fs tree - black, ");
fprintf(html, "extent tree - green, ");
fprintf(html, "csum tree - blue, ");
fprintf(html, "reloc tree - grey, ");
fprintf(html, "other trees - red, ");
fprintf(html, "unknown tree - dark grey");
fprintf(html, "</p>");
}
fprintf(html, "</body></html>\n");
out_close:
fclose(html);
return ret;
}
void fragments_usage(void)
{
printf("usage: btrfs-fragments [options] <path>\n");
printf(" -c use color\n");
printf(" -d print data chunks\n");
printf(" -m print metadata chunks\n");
printf(" -s print system chunks\n");
printf(" (default is data+metadata)\n");
printf(" -o <dir> output directory, default is html\n");
exit(1);
}
int main(int argc, char **argv)
{
char *path;
int fd;
int ret;
u64 flags = 0;
char *dir = "html";
DIR *dirstream = NULL;
while (1) {
int c = getopt(argc, argv, "cmso:h");
if (c < 0)
break;
switch (c) {
case 'c':
use_color = 1;
break;
case 'd':
flags |= BTRFS_BLOCK_GROUP_DATA;
break;
case 'm':
flags |= BTRFS_BLOCK_GROUP_METADATA;
break;
case 's':
flags |= BTRFS_BLOCK_GROUP_SYSTEM;
break;
case 'o':
dir = optarg;
break;
case 'h':
default:
fragments_usage();
}
}
set_argv0(argv);
if (check_argc_min(argc - optind, 1))
return 1;
path = argv[optind++];
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
exit(1);
if (flags == 0)
flags = BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA;
ret = list_fragments(fd, flags, dir);
close_file_or_dir(fd, dirstream);
if (ret)
exit(1);
exit(0);
}
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