debugreiserfs/scan.c

/*
 * Copyright 2000-2004 by Hans Reiser, licensing governed by
 * reiserfsprogs/README
 */

#include "debugreiserfs.h"
#include <regex.h>
#include <obstack.h>
#include <search.h>

#define obstack_chunk_alloc malloc
#define obstack_chunk_free free

/* -n pattern scans the area (on-disk bitmap, or all the device or extern
   bitmap) and looks for every name matching the pattern. All those names get
   stored in 'name_store' and are indexed by name (name_index) and by a key
   they point to (key_index) */

struct obstack name_store;
struct obstack item_store;

int saved_names;
int saved_items;
int skipped_names;
void *key_index;
void *name_index;

regex_t pattern;

struct saved_name {
	unsigned int dirid;	/* pointed object */
	unsigned int objectid;
	struct saved_name *first_name;	/* pointer to name which points to the
					   same object and contains list of file
					   items */

	unsigned int parent_dirid;	/* parent directory */
	unsigned int parent_objectid;
	unsigned long block;	/* where we saw the name for the first time */
	unsigned short count;	/* how many times the name appeared */

	void *items;
	struct saved_name *name_next;	/* list of identical names */

	unsigned short name_len;
	char name[1];
};

/* attach item to every name in the list */
static void store_item(struct saved_name *name, const struct buffer_head *bh,
		       const struct item_head *ih, int pos)
{
	struct saved_item *new;
	void *vp;
	struct saved_item *item_in;

	new = obstack_alloc(&item_store, sizeof(struct saved_item));
	new->si_ih = *ih;
	new->si_block = bh->b_blocknr;
	new->si_item_num = ih - item_head(bh, 0);
	new->si_next = 0;
	new->si_entry_pos = pos;

	vp = tfind(new, &name->items, comp_keys);
	if (vp) {
		item_in = *(void **)vp;
		/* add item to the end of list of items having this key */
		while (1) {
			if (!item_in->si_next) {
				item_in->si_next = new;
				break;
			}
			item_in = item_in->si_next;
		}
	} else
		tsearch(new, &name->items, comp_keys);

	saved_items++;
}

static int comp_names(const void *p1, const void *p2)
{
	struct saved_name *name1, *name2;

	name1 = (struct saved_name *)p1;
	name2 = (struct saved_name *)p2;

	return strcmp(name1->name, name2->name);
}

static int comp_pointed(const void *p1, const void *p2)
{
	struct saved_name *name1, *name2;

	name1 = (struct saved_name *)p1;
	name2 = (struct saved_name *)p2;

	return comp_short_keys(&name1->dirid, &name2->dirid);
}

/* we consider name found only if it points to the same object and from the
   same directory */
static int name_found(struct saved_name *name, struct saved_name **name_in)
{
	void *vp;
	struct saved_name *cur;

	vp = tfind(name, &name_index, comp_names);
	if (!vp) {
		*name_in = 0;
		return 0;
	}

	*name_in = *(void **)vp;

	/* check every name in the list */
	cur = *name_in;
	while (cur) {
		if (!not_of_one_file(&name->dirid, &cur->dirid) &&
		    !not_of_one_file(&name->parent_dirid, &cur->parent_dirid)) {
			cur->count++;
			*name_in = cur;
			return 1;
		}
		cur = cur->name_next;
	}

	return 0;
}

/* add key name is pointing to to the index of keys. If there was already name
   pointing to this key - add pointer to that name */
static void add_key(struct saved_name *name)
{
	void *vp;

	vp = tfind(name, &key_index, comp_pointed);
	if (vp) {
		/* */
		name->first_name = *(void **)vp;
	} else {
		tsearch(name, &key_index, comp_pointed);
	}
}

static void add_name(struct saved_name *name, struct saved_name *name_in)
{
	if (name_in) {
		/* add name to the end of list of identical names */
		while (1) {
			if (!name_in->name_next) {
				name_in->name_next = name;
				break;
			}
			name_in = name_in->name_next;
		}
	} else {
		/* add name into name index */
		tsearch(name, &name_index, comp_names);
	}
}

/* take each name matching to a given pattern, */
static void scan_for_name(struct buffer_head *bh)
{
	int i, j, i_num;
	struct item_head *ih;
	struct reiserfs_de_head *deh;
	int namelen;
	char *name;
	struct saved_name *new, *name_in;
	char ch;
	int retval;
	int min_entry_size = 1;
	int ih_entry_count = 0;

	ih = item_head(bh, 0);
	i_num = leaf_item_number_estimate(bh);
	for (i = 0; i < i_num; i++, ih++) {
		if (!is_direntry_ih(ih))
			continue;
		if (is_it_bad_item(fs, ih, ih_item_body(bh, ih), 0, 1))
			continue;

		deh = B_I_DEH(bh, ih);

		if ((get_ih_entry_count(ih) >
		     (get_ih_item_len(ih) / (DEH_SIZE + min_entry_size)))
		    || (get_ih_entry_count(ih) == 0))
			ih_entry_count =
			    get_ih_item_len(ih) / (DEH_SIZE + min_entry_size);
		else
			ih_entry_count = get_ih_entry_count(ih);

		for (j = 0; j < ih_entry_count; j++, deh++) {
			name = name_in_entry(deh, j);
			namelen = name_in_entry_length(ih, deh, j);
			ch = name[namelen];
			name[namelen] = 0;
			retval = regexec(&pattern, name, 0, NULL, 0);
			name[namelen] = ch;
			if (retval != 0)
				continue;

			/* name matching given pattern found */

			new =
			    obstack_alloc(&name_store,
					  sizeof(struct saved_name) + namelen);

			/* pointed object */
			new->dirid = get_deh_dirid(deh);
			new->objectid = get_deh_objectid(deh);

			/* pointer to first name which points the same key */
			new->first_name = 0;

			/* where this name is from */
			new->parent_dirid = get_key_dirid(&ih->ih_key);
			new->parent_objectid = get_key_objectid(&ih->ih_key);
			new->block = bh->b_blocknr;

			new->count = 1;
			new->items = 0;

			/* name */
			new->name_len = namelen;
			memcpy(new->name, name, namelen);
			new->name[namelen] = 0;
			new->name_next = 0;

			/*
			   reiserfs_warning (stdout, "\n(%K):%s-->(%K) - ", &new->parent_dirid,
			   new->name, &new->dirid);
			 */
			if (name_found(new, &name_in)) {
				/* there was already exactly this name */
				obstack_free(&name_store, new);
				continue;
			}

			saved_names++;
			add_name(new, name_in);
			add_key(new);
		}		/* for each entry */
	}			/* for each item */

	return;
}

static struct saved_name *scan_for_key(const struct reiserfs_key *key)
{
	char *name;
	struct saved_name *new, *name_in;

	asprintf(&name, "%u_%u", get_key_dirid(key), get_key_objectid(key));
	new =
	    obstack_alloc(&name_store,
			  sizeof(struct saved_name) + strlen(name));

	/* pointed object */
	new->dirid = get_key_dirid(key);
	new->objectid = get_key_objectid(key);

	/* pointer to first name which points the same key */
	new->first_name = 0;

	/* where this name is from */

	new->parent_dirid = 0;
	new->parent_objectid = 0;
	new->block = 0;
	new->count = 1;
	new->items = 0;

	/* name */
	new->name_len = strlen(name);
	memcpy(new->name, name, new->name_len);
	new->name[new->name_len] = 0;
	new->name_next = 0;

	free(name);

	if (name_found(new, &name_in)) {
		/* there was already exactly this name */
		obstack_free(&name_store, new);
		return name_in;
	}

	saved_names++;
	add_name(new, name_in);

	return new;
}

static int comp_token_key(const struct buffer_head *bh,
			  const struct item_head *ih,
			  const struct reiserfs_key *key)
{
	struct reiserfs_de_head *deh;
	int j, ih_entry_count = 0;
	int min_entry_size = 1;

	if ((get_key_dirid(&ih->ih_key) == get_key_dirid(key) ||
	     get_key_dirid(key) == ~(__u32) 0) &&
	    (get_key_objectid(&ih->ih_key) == get_key_objectid(key) ||
	     get_key_objectid(key) == ~(__u32) 0))
		return -1;

	if (!is_direntry_ih(ih))
		return 0;

	deh = B_I_DEH(bh, ih);

	if ((get_ih_entry_count(ih) >
	     (get_ih_item_len(ih) / (DEH_SIZE + min_entry_size)))
	    || (get_ih_entry_count(ih) == 0))
		ih_entry_count =
		    get_ih_item_len(ih) / (DEH_SIZE + min_entry_size);
	else
		ih_entry_count = get_ih_entry_count(ih);

	for (j = 0; j < ih_entry_count; j++, deh++) {
		if ((get_deh_dirid(deh) == get_key_dirid(key)
		     || (int)get_key_dirid(key) == -1)
		    && (get_deh_objectid(deh) == get_key_objectid(key)
			|| (int)get_key_objectid(key) == -1)) {
			return j;
		}
	}

	return 0;
}

/* take every item, look for its key in the key index, if it is found - store
   item in the sorted list of items of a file */
static void scan_items(const struct buffer_head *bh, const struct reiserfs_key *key)
{
	int i, i_num, pos;
	struct item_head *ih;
	struct saved_name *name_in_store;
	void *res;

	ih = item_head(bh, 0);
	i_num = leaf_item_number_estimate(bh);
	for (i = 0; i < i_num; i++, ih++) {
		if (key) {
			if (!(pos = comp_token_key(bh, ih, key)))
				continue;

			name_in_store = scan_for_key(&ih->ih_key);
		} else {
			if (!
			    (res =
			     tfind(&ih->ih_key, &key_index, comp_pointed)))
				continue;

			/* name pointing to this key found */
			name_in_store = *(struct saved_name **)res;
			pos = -1;
		}

		store_item(name_in_store, bh, ih, pos);
	}
}

/* FIXME: does not work for long files */
struct version {
	int flag;		/* direct or indirect */
	int len;
	__u32 from;
	int count;
	void *data;
};

struct tail {
	__u32 offset;
	int len;
	char *data;
};

struct file_map {
	int head_len;		/* number of unfm pointers */
	void *head;

	int tail_nr;		/* number of tails found */
	struct tail *tails;

	int version_nr;
	void *versions;		/* list of range versions */
};

struct file_map map;

static int have_to_append(struct item_head *ih)
{
	loff_t off = get_offset(&ih->ih_key);

	if (is_indirect_ih(ih)) {
		if (map.head_len * fs->fs_blocksize + 1 <= off)
			return 1;
		return 0;
	} else if (is_direct_ih(ih)) {
		int i;
		__u32 tail_start;

		tail_start = (off & ~(fs->fs_blocksize - 1)) + 1;

		// find correct tail first
		for (i = 0; i < map.tail_nr; i++) {
			if (map.tails[i].offset == tail_start) {
				if (map.tails[i].offset + map.tails[i].len <=
				    off)
					return 1;
				return 0;
			}
		}
		// there was no this tail yet
		return 1;
	}
	return 0;
}

static void do_append(struct item_head *ih, void *data)
{
	int i;
	int padd;
	unsigned long long off = get_offset(&ih->ih_key);

	if (is_indirect_ih(ih)) {

		padd = (off - 1) / fs->fs_blocksize - map.head_len;
		map.head =
		    realloc(map.head,
			    (map.head_len + padd + I_UNFM_NUM(ih)) * 4);
		if (!map.head)
			reiserfs_panic("realloc failed");
		memset((char *)map.head + map.head_len * 4, 0, padd * 4);
		memcpy((char *)map.head + (map.head_len + padd) * 4, data,
		       get_ih_item_len(ih));
		map.head_len += (padd + I_UNFM_NUM(ih));

	} else if (is_direct_ih(ih)) {
		unsigned int tail_start, skip;

		// find correct tail first
		tail_start = (off & ~(fs->fs_blocksize - 1)) + 1;
		skip = (off - 1) & (fs->fs_blocksize - 1);
		for (i = 0; i < map.tail_nr; i++) {
			if (map.tails[i].offset == tail_start) {
				map.tails[i].data = realloc(map.tails[i].data,
							    off - tail_start +
							    get_ih_item_len
							    (ih));
				if (!map.tails[i].data)
					reiserfs_panic("realloc failed");
				padd = skip - map.tails[i].len;
				memset(map.tails[i].data + map.tails[i].len, 0,
				       padd);
				memcpy(map.tails[i].data + map.tails[i].len +
				       padd, data, get_ih_item_len(ih));
				map.tails[i].len +=
				    (padd + get_ih_item_len(ih));
				return;
			}
		}
		// allocate memory for new tail
		map.tails =
		    realloc(map.tails, (map.tail_nr + 1) * sizeof(struct tail));
		if (!map.tails)
			reiserfs_panic("realloc failed");

		map.tails[map.tail_nr].offset = off;
		map.tails[map.tail_nr].len = skip + get_ih_item_len(ih);
		map.tails[map.tail_nr].data =
		    malloc(map.tails[map.tail_nr].len);
		memset(map.tails[map.tail_nr].data, 0, skip);
		memcpy(map.tails[map.tail_nr].data + skip, data,
		       get_ih_item_len(ih));
		map.tail_nr++;
	}
}

// map contains
static void do_overwrite(struct item_head *ih, void *data)
{
	unsigned long long off, skip;
	int to_compare, to_append;
	struct item_head tmp_ih;
	char *p;

	off = get_offset(&ih->ih_key);

	if (is_indirect_ih(ih)) {

		skip = (off - 1) / fs->fs_blocksize;
		to_compare = (map.head_len - skip > I_UNFM_NUM(ih)) ?
		    I_UNFM_NUM(ih) : (map.head_len - skip);
		to_append = I_UNFM_NUM(ih) - to_compare;

		p = (char *)map.head + skip * 4;

		if (memcmp(p, data, to_compare * 4))
			reiserfs_warning(stderr,
					 "overwrite (indirect): %H contains different data\n",
					 ih);

		if (to_append) {
			tmp_ih = *ih;
			set_ih_item_len(&tmp_ih,
					get_ih_item_len(ih) - to_compare * 4);
			set_offset(key_format(&ih->ih_key), &tmp_ih.ih_key,
				   off + to_compare * fs->fs_blocksize);
			do_append(&tmp_ih, (char *)data + to_compare * 4);
		}

	} else if (is_direct_ih(ih)) {
		unsigned int tail_start;
		int i;

		// find correct tail first
		tail_start = (off & ~(fs->fs_blocksize - 1)) + 1;
		for (i = 0; i < map.tail_nr; i++) {
			if (map.tails[i].offset == tail_start) {
				// ih is a part of this tail
				skip = (off - 1) & (fs->fs_blocksize - 1);
				to_compare =
				    (map.tails[i].len - skip >
				     get_ih_item_len(ih) ? get_ih_item_len(ih) :
				     map.tails[i].len - skip);
				to_append = get_ih_item_len(ih) - to_compare;

				p = (char *)map.tails[i].data + skip;

				if (memcmp(p, data, to_compare))
					reiserfs_warning(stderr,
							 "overwrite (direct): %H contains different data\n",
							 ih);

				if (to_append) {
					tmp_ih = *ih;
					set_ih_item_len(&tmp_ih,
							get_ih_item_len(ih) -
							to_compare);
					set_offset(key_format(&ih->ih_key),
						   &tmp_ih.ih_key,
						   off + to_compare);
					do_append(&tmp_ih,
						  (char *)data + to_compare);
				}
				return;
			}
		}
		reiserfs_panic("no appropriate tail found");
	}
}

static void map_one_item(struct saved_item *item)
{
	struct buffer_head *bh;
	struct item_head *ih;
	void *data;

	// read the block containing the item
	bh = bread(fs->fs_dev, item->si_block, fs->fs_blocksize);
	if (!bh) {
		reiserfs_warning(stderr, "bread failed\n");
		return;
	}

	ih = item_head(bh, item->si_item_num);
	data = ih_item_body(bh, ih);
	if (memcmp(&item->si_ih, ih, sizeof(*ih)))
		reiserfs_panic("wrong item");

	if (have_to_append(ih)) {
		do_append(ih, data);
	} else
		do_overwrite(ih, data);

	brelse(bh);
}

// flush map which is in variable map
static void flush_map(reiserfs_filsys_t fs,
		      const struct reiserfs_key *dir,
		      const char *name, const struct reiserfs_key *key)
{
	int i;
	FILE *fp;
	__u32 v32;

	if (!map_file(fs))
		asprintf(&map_file(fs), "%s", ".map");

	//reiserfs_warning (stderr, "Saving maps into %s\n", map_file (fs));
	fp = fopen(map_file(fs), "a");
	if (fp == 0) {
		reiserfs_warning(stderr, "flush_map: fopen failed: %m");
		return;
	}

	v32 = MAP_MAGIC;
	fwrite(&v32, sizeof(v32), 1, fp);

	// device name
	v32 = strlen(device_name(fs)) + 1;
	fwrite(&v32, sizeof(v32), 1, fp);
	fwrite(device_name(fs), v32, 1, fp);

	// name length and the name itself
	v32 = strlen(name) + 1;
	fwrite(&v32, sizeof(v32), 1, fp);
	fwrite(name, v32, 1, fp);

	// short key of a directory
	fwrite(dir, SHORT_KEY_SIZE, 1, fp);

	// short key of file
	fwrite(key, SHORT_KEY_SIZE, 1, fp);

	// list of data block pointers
	fwrite(&map.head_len, sizeof(map.head_len), 1, fp);
	fwrite(map.head, map.head_len * 4, 1, fp);

	// find correct tail first
	for (i = 0; i < map.tail_nr; i++) {
		if (map.tails[i].offset == map.head_len * fs->fs_blocksize) {
			// tail length and the tail itself
			fwrite(&map.tails[i].len, sizeof(map.tails[i].len), 1,
			       fp);
			fwrite(map.tails[i].data, map.tails[i].len, 1, fp);
			break;
		}
	}
	if (i == map.tail_nr) {
		// no tail
		v32 = 0;
		fwrite(&v32, sizeof(v32), 1, fp);
	}

	v32 = MAP_END_MAGIC;
	fwrite(&v32, sizeof(v32), 1, fp);

	fclose(fp);
}

// write map of file to a map file
/*

static void map_item_list (const void *nodep, VISIT value, int level)
{
    struct saved_item * item, * longest;
    int bytes, max_bytes;

    if (value != leaf && value != postorder)
	return;

    item = *(struct saved_item **)nodep;

    // 1. find the longest item
    max_bytes = get_bytes_number (&item->si_ih, fs->fs_blocksize);
    longest = item;
    while (item->si_next) {
	item = item->si_next;
	bytes = get_bytes_number (&item->si_ih, fs->fs_blocksize);
	if (bytes > max_bytes) {
	    longest = item;
	    max_bytes = bytes;
	}
    }

    map_one_item (longest);

    // map other items
    item = *(struct saved_item **)nodep;
    while (item) {
	if (item != longest)
	    map_one_item (item);
	item = item->si_next;
    }
}

static void make_file_map (const void *nodep, VISIT value, int level)
{
    struct saved_name * name;
    static int nr = 0;

    name = *(struct saved_name **)nodep;

    if (value == leaf || value == postorder) {
	while (name) {
	    reiserfs_warning (stdout, "%d - (%d): [%K]:\"%s\":\n", ++nr, name->count,
			      &name->parent_dirid, name->name);
	
	    if (name->items) {
		// initialize the map
		memset (&map, 0, sizeof (struct file_map));
		
		// make a map of file
		twalk (name->items, map_item_list);
		
		// write map to a file
		flush_map (fs, (struct reiserfs_key *)&name->parent_dirid, name->name,
			   (struct reiserfs_key *)&name->dirid);
		
	    } else if (name->first_name)
		reiserfs_warning (stdout, "[%K]:\"%s\" has item list\n",
				  &name->first_name->parent_dirid,
				  name->first_name->name);
	    else {
		reiserfs_warning (stdout, "No items of the file [%K] found\n",
				  &name->dirid);
	    }

	    name = name->name_next;
	}
    }
}
*/

static void print_items(FILE * fp, reiserfs_filsys_t fs)
{
	struct buffer_head *bh;
	struct item_head *ih;
	struct saved_item item;
	int size = sizeof(struct saved_item) - sizeof(struct saved_item *);

	while (fread(&item, size, 1, fp) == 1) {
		bh = bread(fs->fs_dev, item.si_block, fs->fs_blocksize);
		if (!bh) {
			reiserfs_warning(fp, "bread failed\n");
			continue;
		}
		ih = item_head(bh, item.si_item_num);
		reiserfs_print_item(stdout, bh, ih);
		brelse(bh);
	}
}

void print_map(reiserfs_filsys_t fs)
{
	FILE *fp;

	if (map_file(fs)) {
		fp = fopen(map_file(fs), "r");
		if (fp == 0) {
			reiserfs_warning(stderr, "fopen failed: %m\n");
			return;
		}
	} else {
		reiserfs_warning(stderr, "Reading file map from stdin..\n");
		fflush(stderr);
		fp = stdin;
	}

	print_items(fp, fs);

	if (fp != stdin) {
		fclose(fp);
		fp = NULL;
	}
}

static FILE *fp = 0;
FILE *log_to;

static void save_items(const void *nodep, VISIT value, int level)
{
	struct saved_item *item;

	if (value != leaf && value != postorder)
		return;

	item = *(struct saved_item **)nodep;

	while (item) {
		if (fp) {
			fwrite(item,
			       sizeof(struct saved_item) -
			       sizeof(struct saved_item *), 1, fp);
		} else {
			if (is_direntry_ih(&item->si_ih)
			    && item->si_entry_pos != -1) {
				reiserfs_warning(log_to,
						 "block %lu, item %d (%H): entry %d\n",
						 item->si_block,
						 item->si_item_num,
						 &item->si_ih,
						 item->si_entry_pos);
			} else {
				reiserfs_warning(log_to,
						 "block %lu, item %d belongs to file %K: %H\n",
						 item->si_block,
						 item->si_item_num,
						 &item->si_ih.ih_key,
						 &item->si_ih);

			}
		}

		item = item->si_next;
	}
}

static void make_map(const void *nodep, VISIT value, int level)
{
	struct saved_name *name;
	char *file_name = 0;
	static int nr = 0;

	name = *(struct saved_name **)nodep;

	if (value == leaf || value == postorder) {
		while (name) {
			if (map_file(fs)) {
				asprintf(&file_name, "%s.%d", map_file(fs),
					 ++nr);
				reiserfs_warning(log_to,
						 "%d - (%d): [%K]:\"%s\": stored in the %s\n",
						 nr, name->count,
						 &name->parent_dirid,
						 name->name, file_name);

				if (fp == 0) {
					fp = fopen(file_name, "w+");
					if (!fp) {
						reiserfs_exit(1,
							      "could open %s: %m",
							      file_name);
					}
				}
			}

			if (name->items)
				twalk(name->items, save_items);

			name = name->name_next;
			if (fp) {
				fclose(fp);
				fp = NULL;
				free(file_name);
			}
		}
	}
}

/* store map if it is a regular file */
static void locate_file(reiserfs_filsys_t fs, struct reiserfs_key *key)
{
	INITIALIZE_REISERFS_PATH(path);
	struct reiserfs_key *next_key;
	int retval;

	do {
		retval = reiserfs_search_by_key_4(fs, key, &path);
		if (retval != ITEM_FOUND)
			break;

		if (!is_stat_data_key(key) && !is_direntry_key(key)) {
			struct saved_item si;

			si.si_block = get_bh(&path)->b_blocknr;
			si.si_item_num = get_item_pos(&path);
			si.si_ih = *tp_item_head(&path);
			map_one_item(&si);
		}

		/*reiserfs_warning (stdout, "\t");
		   reiserfs_print_item (stdout, get_bh (&path), get_ih (&path)); */

		next_key = reiserfs_next_key(&path);
		if (!next_key || not_of_one_file(next_key, key))
			break;

		*key = *next_key;
		pathrelse(&path);
	} while (1);

	pathrelse(&path);
}

/* read stdin and look for specified name in the specified directory */
static void look_for_name(reiserfs_filsys_t fs)
{
	INITIALIZE_REISERFS_PATH(path);
	char *name, *objectid, *dirid;
	size_t n;
	struct reiserfs_key key = { 0, };

	reiserfs_warning(stderr,
			 "Enter dirid objectid \"name\" or press ^D to quit\n");
	while (1) {
		reiserfs_warning(stderr, ">");
		n = 0;
		dirid = 0;
		if (getdelim(&dirid, &n, ' ', stdin) == -1)
			break;
		if (!strcmp(dirid, "\n"))
			break;
		set_key_dirid(&key, atol(dirid));

		n = 0;
		objectid = 0;
		if (getdelim(&objectid, &n, ' ', stdin) == -1)
			break;
		set_key_objectid(&key, atol(objectid));

		n = 0;
		name = 0;
		if (getdelim(&name, &n, '\n', stdin) == -1)
			break;

		name[strlen(name) - 1] = 0;
		reiserfs_warning(stdout, "looking for file \"%s\" in (%K) - ",
				 name, &key);

		if (reiserfs_locate_entry(fs, &key, name, &path)) {
			struct reiserfs_key fkey = { 0, };
			struct reiserfs_de_head *deh;

			reiserfs_warning(stdout,
					 "name is found in block %lu (item %d, entry %d)\n",
					 get_bh(&path)->b_blocknr,
					 get_item_pos(&path), path.pos_in_item);
			deh =
			    B_I_DEH(get_bh(&path),
				    tp_item_head(&path)) + path.pos_in_item;
			set_key_dirid(&fkey, get_deh_dirid(deh));
			set_key_objectid(&fkey, get_deh_objectid(deh));

			pathrelse(&path);

			/* look for file and print its layout */
			memset(&map, 0, sizeof(struct file_map));

			locate_file(fs, &fkey);

			flush_map(fs, &key, name, &fkey);

		} else {
			reiserfs_warning(stdout, "name not found\n");
		}

		free(dirid);
		free(objectid);
		free(name);
	}
}

#if 0
static void scan_for_key(struct buffer_head *bh, struct reiserfs_key *key)
{
	int i, j, i_num;
	struct item_head *ih;
	struct reiserfs_de_head *deh;
	int min_entry_size = 1;
	int ih_entry_count = 0;

	ih = item_head(bh, 0);
	i_num = leaf_item_number_estimate(bh);
	for (i = 0; i < i_num; i++, ih++) {
		if ((get_key_dirid(&ih->ih_key) == get_key_dirid(key) ||
		     get_key_dirid(key) == ~(__u32) 0) &&
		    (get_key_objectid(&ih->ih_key) == get_key_objectid(key) ||
		     get_key_objectid(key) == ~(__u32) 0)) {
			reiserfs_warning(log_to,
					 "%d-th item of block %lu is item of file %K: %H\n",
					 i, bh->b_blocknr, key, ih);
		}
		if (!is_direntry_ih(ih))
			continue;
		deh = B_I_DEH(bh, ih);

		if ((get_ih_entry_count(ih) >
		     (get_ih_item_len(ih) / (DEH_SIZE + min_entry_size)))
		    || (get_ih_entry_count(ih) == 0))
			ih_entry_count =
			    get_ih_item_len(ih) / (DEH_SIZE + min_entry_size);
		else
			ih_entry_count = get_ih_entry_count(ih);

		for (j = 0; j < ih_entry_count; j++, deh++) {
			if ((get_deh_dirid(deh) == get_key_dirid(key)
			     || (int)get_key_dirid(key) == -1)
			    && (get_deh_objectid(deh) == get_key_objectid(key)
				|| (int)get_key_objectid(key) == -1)) {
				reiserfs_warning(log_to,
						 "dir item %d (%H) of block %lu has "
						 "entry (%d-th) %.*s pointing to %K\n",
						 i, ih, bh->b_blocknr, j,
						 name_in_entry_length(ih, deh,
								      j),
						 name_in_entry(deh, j), key);
			}
		}
	}
	return;
}
#endif

void do_scan(reiserfs_filsys_t fs)
{
	unsigned long i;
	struct buffer_head *bh;
	int type;
	char *answer = 0;
	size_t n = 0;
	struct reiserfs_key key = { 0, 0, };
	unsigned long done, total;

	if (debug_mode(fs) == DO_LOOK_FOR_NAME) {
		/* look for a file in using tree algorithms */
		look_for_name(fs);
		return;
	}

	/* scan area of disk and store all names matching the pattern */

	/* initialize storage and two indexes */
	obstack_init(&name_store);
	obstack_init(&item_store);
	key_index = 0;
	name_index = 0;

	total = reiserfs_bitmap_ones(input_bitmap(fs));

	log_to = fopen("scan.log", "w+");
	printf("Log file 'scan.log' is opened\n");

	if (debug_mode(fs) == DO_SCAN_FOR_NAME) {
		if (regcomp(&pattern, name_pattern(fs), 0)) {
			printf("regcomp failed");
			return;
		}

		printf("Looking for names matching %s\n", name_pattern(fs));
		set_key_dirid(&key, 1);
	} else {
		printf("What key do you want to find: dirid?");
		getline(&answer, &n, stdin);
		set_key_dirid(&key, atoi(answer));

		printf("objectid?");
		getline(&answer, &n, stdin);
		set_key_objectid(&key, atoi(answer));
		reiserfs_warning(stderr, "looking for (%K)\n", &key);
	}

	if (debug_mode(fs) == DO_SCAN_FOR_NAME) {
		done = 0;
		for (i = 0; i < get_sb_block_count(fs->fs_ondisk_sb); i++) {
			if (!reiserfs_bitmap_test_bit(input_bitmap(fs), i))
				continue;
			bh = bread(fs->fs_dev, i, fs->fs_blocksize);
			if (!bh) {
				printf("could not read block %lu\n", i);
				continue;
			}
			type = who_is_this(bh->b_data, bh->b_size);
			if (type == THE_LEAF || type == HAS_IH_ARRAY)
				scan_for_name(bh);
			else
				reiserfs_bitmap_clear_bit(input_bitmap(fs), i);
			brelse(bh);
			print_how_far(stderr, &done, total, 1, be_quiet(fs));
		}
	}

	fprintf(stderr, "\n");
	if (debug_mode(fs) == DO_SCAN_FOR_NAME)
		fprintf(stderr,
			"There were found %d names matching the pattern \"%s\", %d names skipped\n",
			saved_names, name_pattern(fs), skipped_names);
	fflush(stderr);

	/* step 2: */
	done = 0;
	total = reiserfs_bitmap_ones(input_bitmap(fs));
	printf("%lu bits set in bitmap\n", total);
	for (i = 0; i < get_sb_block_count(fs->fs_ondisk_sb); i++) {
		int type;

		if (!reiserfs_bitmap_test_bit(input_bitmap(fs), i))
			continue;
		bh = bread(fs->fs_dev, i, fs->fs_blocksize);
		if (!bh) {
			printf("could not read block %lu\n", i);
			continue;
		}
		type = who_is_this(bh->b_data, bh->b_size);
		switch (type) {
		case THE_JDESC:
			if (!get_key_dirid(&key))
				printf("block %lu is journal descriptor\n", i);
			break;
		case THE_SUPER:
			if (!get_key_dirid(&key))
				printf("block %lu is reiserfs super block\n",
				       i);
			break;
		case THE_INTERNAL:
			if (!get_key_dirid(&key))
				printf("block %lu is reiserfs internal node\n",
				       i);
			break;
		case THE_LEAF:
		case HAS_IH_ARRAY:
			scan_items(bh,
				   (debug_mode(fs) ==
				    DO_SCAN_FOR_NAME ? NULL : &key));
			break;
		default:
			break;
		}

		brelse(bh);
		print_how_far(stderr, &done, total, 1, be_quiet(fs));
	}
	fprintf(stderr, "\nThere were %d items saved\n", saved_items);

	/* ok, print what we found */
	/*twalk (name_index, print_file); */

	/* create map for every file in */
	twalk(name_index, make_map);

	/* print names of files we have map of in a file 'file.list' */
	/*twalk (name_index, print_name); */
}