dumpe2fs.c revision 8deb80a5d1078cbe43eaffcdeebf0a1a549d6a54 
1/*
2 * dumpe2fs.c		- List the control structures of a second
3 *			  extended filesystem
4 *
5 * Copyright (C) 1992, 1993, 1994  Remy Card <card@masi.ibp.fr>
6 *                                 Laboratoire MASI, Institut Blaise Pascal
7 *                                 Universite Pierre et Marie Curie (Paris VI)
8 *
9 * Copyright 1995, 1996, 1997 by Theodore Ts'o.
10 *
11 * %Begin-Header%
12 * This file may be redistributed under the terms of the GNU Public
13 * License.
14 * %End-Header%
15 */
16
17/*
18 * History:
19 * 94/01/09	- Creation
20 * 94/02/27	- Ported to use the ext2fs library
21 */
22
23#ifdef HAVE_GETOPT_H
24#include <getopt.h>
25#else
26extern char *optarg;
27extern int optind;
28#endif
29#include <fcntl.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <unistd.h>
34
35#include "ext2fs/ext2_fs.h"
36
37#include "ext2fs/ext2fs.h"
38#include "e2p/e2p.h"
39#include "jfs_user.h"
40#include <uuid/uuid.h>
41
42#include "../version.h"
43#include "nls-enable.h"
44
45#define in_use(m, x)	(ext2fs_test_bit ((x), (m)))
46
47const char * program_name = "dumpe2fs";
48char * device_name = NULL;
49int hex_format = 0;
50
51static void usage(void)
52{
53	fprintf (stderr, _("Usage: %s [-bfhixV] [-ob superblock] "
54		 "[-oB blocksize] device\n"), program_name);
55	exit (1);
56}
57
58static void print_number(unsigned long num)
59{
60	if (hex_format)
61		printf("0x%04lx", num);
62	else
63		printf("%lu", num);
64}
65
66static void print_range(unsigned long a, unsigned long b)
67{
68	if (hex_format)
69		printf("0x%04lx-0x%04lx", a, b);
70	else
71		printf("%lu-%lu", a, b);
72}
73
74static void print_free (unsigned long group, char * bitmap,
75			unsigned long nbytes, unsigned long offset)
76{
77	int p = 0;
78	unsigned long i;
79	unsigned long j;
80
81	offset += group * nbytes;
82	for (i = 0; i < nbytes; i++)
83		if (!in_use (bitmap, i))
84		{
85			if (p)
86				printf (", ");
87			print_number(i + offset);
88			for (j = i; j < nbytes && !in_use (bitmap, j); j++)
89				;
90			if (--j != i) {
91				fputc('-', stdout);
92				print_number(j + offset);
93				i = j;
94			}
95			p = 1;
96		}
97}
98
99static void list_desc (ext2_filsys fs)
100{
101	unsigned long i;
102	long diff;
103	blk_t	group_blk, next_blk;
104	blk_t	super_blk, old_desc_blk, new_desc_blk;
105	char *block_bitmap=NULL, *inode_bitmap=NULL;
106	int inode_blocks_per_group, old_desc_blocks, reserved_gdt;
107	int has_super;
108
109	if (fs->block_map)
110		block_bitmap = fs->block_map->bitmap;
111	if (fs->inode_map)
112		inode_bitmap = fs->inode_map->bitmap;
113
114	inode_blocks_per_group = ((fs->super->s_inodes_per_group *
115				   EXT2_INODE_SIZE(fs->super)) +
116				  EXT2_BLOCK_SIZE(fs->super) - 1) /
117				 EXT2_BLOCK_SIZE(fs->super);
118	reserved_gdt = fs->super->s_reserved_gdt_blocks;
119	fputc('\n', stdout);
120	group_blk = fs->super->s_first_data_block;
121	if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG)
122		old_desc_blocks = fs->super->s_first_meta_bg;
123	else
124		old_desc_blocks = fs->desc_blocks;
125	for (i = 0; i < fs->group_desc_count; i++) {
126		ext2fs_super_and_bgd_loc(fs, i, &super_blk,
127					 &old_desc_blk, &new_desc_blk, 0);
128		next_blk = group_blk + fs->super->s_blocks_per_group;
129		if (next_blk > fs->super->s_blocks_count)
130			next_blk = fs->super->s_blocks_count;
131		printf (_("Group %lu: (Blocks "), i);
132		print_range(group_blk, next_blk - 1);
133		fputs(")\n", stdout);
134		has_super = ((i==0) || super_blk);
135		if (has_super) {
136			printf (_("  %s superblock at "),
137				i == 0 ? _("Primary") : _("Backup"));
138			print_number(super_blk);
139		}
140		if (old_desc_blk) {
141			printf(_(", Group descriptors at "));
142			print_range(old_desc_blk,
143				    old_desc_blk + old_desc_blocks - 1);
144			if (reserved_gdt) {
145				printf(_("\n  Reserved GDT blocks at "));
146				print_range(old_desc_blk + old_desc_blocks,
147					    old_desc_blk + old_desc_blocks +
148					    reserved_gdt - 1);
149			}
150		} else if (new_desc_blk) {
151			fputc(has_super ? ',' : ' ', stdout);
152			printf(_(" Group descriptor at "));
153			print_number(new_desc_blk);
154			has_super++;
155		}
156		if (has_super)
157			fputc('\n', stdout);
158		fputs(_("  Block bitmap at "), stdout);
159		print_number(fs->group_desc[i].bg_block_bitmap);
160		diff = fs->group_desc[i].bg_block_bitmap - group_blk;
161		if (diff >= 0)
162			printf(" (+%ld)", diff);
163		fputs(_(", Inode bitmap at "), stdout);
164		print_number(fs->group_desc[i].bg_inode_bitmap);
165		diff = fs->group_desc[i].bg_inode_bitmap - group_blk;
166		if (diff >= 0)
167			printf(" (+%ld)", diff);
168		fputs(_("\n  Inode table at "), stdout);
169		print_range(fs->group_desc[i].bg_inode_table,
170			    fs->group_desc[i].bg_inode_table +
171			    inode_blocks_per_group - 1);
172		diff = fs->group_desc[i].bg_inode_table - group_blk;
173		if (diff > 0)
174			printf(" (+%ld)", diff);
175		printf (_("\n  %d free blocks, %d free inodes, "
176			  "%d directories\n"),
177			fs->group_desc[i].bg_free_blocks_count,
178			fs->group_desc[i].bg_free_inodes_count,
179			fs->group_desc[i].bg_used_dirs_count);
180		if (block_bitmap) {
181			fputs(_("  Free blocks: "), stdout);
182			print_free (i, block_bitmap,
183				    fs->super->s_blocks_per_group,
184				    fs->super->s_first_data_block);
185			fputc('\n', stdout);
186			block_bitmap += fs->super->s_blocks_per_group / 8;
187		}
188		if (inode_bitmap) {
189			fputs(_("  Free inodes: "), stdout);
190			print_free (i, inode_bitmap,
191				    fs->super->s_inodes_per_group, 1);
192			fputc('\n', stdout);
193			inode_bitmap += fs->super->s_inodes_per_group / 8;
194		}
195		group_blk = next_blk;
196	}
197}
198
199static void list_bad_blocks(ext2_filsys fs, int dump)
200{
201	badblocks_list		bb_list = 0;
202	badblocks_iterate	bb_iter;
203	blk_t			blk;
204	errcode_t		retval;
205	const char		*header, *fmt;
206
207	retval = ext2fs_read_bb_inode(fs, &bb_list);
208	if (retval) {
209		com_err("ext2fs_read_bb_inode", retval, 0);
210		return;
211	}
212	retval = ext2fs_badblocks_list_iterate_begin(bb_list, &bb_iter);
213	if (retval) {
214		com_err("ext2fs_badblocks_list_iterate_begin", retval,
215			_("while printing bad block list"));
216		return;
217	}
218	if (dump) {
219		header = fmt = "%d\n";
220	} else {
221		header =  _("Bad blocks: %d");
222		fmt = ", %d";
223	}
224	while (ext2fs_badblocks_list_iterate(bb_iter, &blk)) {
225		printf(header ? header : fmt, blk);
226		header = 0;
227	}
228	ext2fs_badblocks_list_iterate_end(bb_iter);
229	if (!dump)
230		fputc('\n', stdout);
231}
232
233static void print_journal_information(ext2_filsys fs)
234{
235	errcode_t	retval;
236	char		buf[1024];
237	char		str[80];
238	unsigned int	i;
239	journal_superblock_t	*jsb;
240
241	/* Get the journal superblock */
242	if ((retval = io_channel_read_blk(fs->io, fs->super->s_first_data_block+1, -1024, buf))) {
243		com_err(program_name, retval,
244			_("while reading journal superblock"));
245		exit(1);
246	}
247	jsb = (journal_superblock_t *) buf;
248	if ((jsb->s_header.h_magic != (unsigned) ntohl(JFS_MAGIC_NUMBER)) ||
249	    (jsb->s_header.h_blocktype !=
250	     (unsigned) ntohl(JFS_SUPERBLOCK_V2))) {
251		com_err(program_name, 0,
252			_("Couldn't find journal superblock magic numbers"));
253		exit(1);
254	}
255
256	printf(_("\nJournal block size:       %u\n"
257		 "Journal length:           %u\n"
258		 "Journal first block:      %u\n"
259		 "Journal sequence:         0x%08x\n"
260		 "Journal start:            %u\n"
261		 "Journal number of users:  %lu\n"),
262	       ntohl(jsb->s_blocksize),  ntohl(jsb->s_maxlen),
263	       ntohl(jsb->s_first), ntohl(jsb->s_sequence),
264	       ntohl(jsb->s_start), ntohl(jsb->s_nr_users));
265
266	for (i=0; i < ntohl(jsb->s_nr_users); i++) {
267		uuid_unparse(&jsb->s_users[i*16], str);
268		printf(i ? "                          %s\n"
269		       : _("Journal users:            %s\n"),
270		       str);
271	}
272}
273
274int main (int argc, char ** argv)
275{
276	errcode_t	retval;
277	ext2_filsys	fs;
278	int		print_badblocks = 0;
279	int		use_superblock = 0;
280	int		use_blocksize = 0;
281	int		image_dump = 0;
282	int		force = 0;
283	int		flags;
284	int		header_only = 0;
285	int		big_endian;
286	int		c;
287
288#ifdef ENABLE_NLS
289	setlocale(LC_MESSAGES, "");
290	setlocale(LC_CTYPE, "");
291	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
292	textdomain(NLS_CAT_NAME);
293#endif
294	initialize_ext2_error_table();
295	fprintf (stderr, "dumpe2fs %s (%s)\n", E2FSPROGS_VERSION,
296		 E2FSPROGS_DATE);
297	if (argc && *argv)
298		program_name = *argv;
299
300	while ((c = getopt (argc, argv, "bfhixVo:")) != EOF) {
301		switch (c) {
302		case 'b':
303			print_badblocks++;
304			break;
305		case 'f':
306			force++;
307			break;
308		case 'h':
309			header_only++;
310			break;
311		case 'i':
312			image_dump++;
313			break;
314		case 'o':
315			if (optarg[0] == 'b')
316				use_superblock = atoi(optarg+1);
317			else if (optarg[0] == 'B')
318				use_blocksize = atoi(optarg+1);
319			else
320				usage();
321			break;
322		case 'V':
323			/* Print version number and exit */
324			fprintf(stderr, _("\tUsing %s\n"),
325				error_message(EXT2_ET_BASE));
326			exit(0);
327		case 'x':
328			hex_format++;
329			break;
330		default:
331			usage();
332		}
333	}
334	if (optind > argc - 1)
335		usage();
336	device_name = argv[optind++];
337	if (use_superblock && !use_blocksize)
338		use_blocksize = 1024;
339	flags = EXT2_FLAG_JOURNAL_DEV_OK;
340	if (force)
341		flags |= EXT2_FLAG_FORCE;
342	if (image_dump)
343		flags |= EXT2_FLAG_IMAGE_FILE;
344
345	retval = ext2fs_open (device_name, flags, use_superblock,
346			      use_blocksize, unix_io_manager, &fs);
347	if (retval) {
348		com_err (program_name, retval, _("while trying to open %s"),
349			 device_name);
350		printf (_("Couldn't find valid filesystem superblock.\n"));
351		exit (1);
352	}
353	if (print_badblocks) {
354		list_bad_blocks(fs, 1);
355	} else {
356		big_endian = ((fs->flags & EXT2_FLAG_SWAP_BYTES) != 0);
357#ifdef WORDS_BIGENDIAN
358		big_endian = !big_endian;
359#endif
360		if (big_endian)
361			printf(_("Note: This is a byte-swapped filesystem\n"));
362		list_super (fs->super);
363		if (fs->super->s_feature_incompat &
364		      EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
365			print_journal_information(fs);
366			ext2fs_close(fs);
367			exit(0);
368		}
369		list_bad_blocks(fs, 0);
370		if (header_only) {
371			ext2fs_close (fs);
372			exit (0);
373		}
374		retval = ext2fs_read_bitmaps (fs);
375		list_desc (fs);
376		if (retval) {
377			printf(_("\n%s: %s: error reading bitmaps: %s\n"),
378			       program_name, device_name,
379			       error_message(retval));
380		}
381	}
382	ext2fs_close (fs);
383	exit (0);
384}
385