main.c revision 0d89e5acea99fc00d9b834eab6d228c47a71920a 
1/*
2 * main.c --- ext2 resizer main program
3 *
4 * Copyright (C) 1997, 1998 by Theodore Ts'o and
5 * 	PowerQuest, Inc.
6 *
7 * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o
8 *
9 * %Begin-Header%
10 * This file may be redistributed under the terms of the GNU Public
11 * License.
12 * %End-Header%
13 */
14
15#define _LARGEFILE_SOURCE
16#define _LARGEFILE64_SOURCE
17
18#include "config.h"
19#ifdef HAVE_GETOPT_H
20#include <getopt.h>
21#else
22extern char *optarg;
23extern int optind;
24#endif
25#include <unistd.h>
26#ifdef HAVE_STDLIB_H
27#include <stdlib.h>
28#endif
29#include <sys/types.h>
30#include <sys/stat.h>
31#include <fcntl.h>
32
33#include "e2p/e2p.h"
34
35#include "resize2fs.h"
36
37#include "../version.h"
38
39char *program_name, *device_name, *io_options;
40
41static void usage (char *prog)
42{
43	fprintf (stderr, _("Usage: %s [-d debug_flags] [-f] [-F] [-M] [-P] "
44			   "[-p] device [new_size]\n\n"), prog);
45
46	exit (1);
47}
48
49static errcode_t resize_progress_func(ext2_resize_t rfs, int pass,
50				      unsigned long cur, unsigned long max)
51{
52	ext2_sim_progmeter progress;
53	const char	*label;
54	errcode_t	retval;
55
56	progress = (ext2_sim_progmeter) rfs->prog_data;
57	if (max == 0)
58		return 0;
59	if (cur == 0) {
60		if (progress)
61			ext2fs_progress_close(progress);
62		progress = 0;
63		switch (pass) {
64		case E2_RSZ_EXTEND_ITABLE_PASS:
65			label = _("Extending the inode table");
66			break;
67		case E2_RSZ_BLOCK_RELOC_PASS:
68			label = _("Relocating blocks");
69			break;
70		case E2_RSZ_INODE_SCAN_PASS:
71			label = _("Scanning inode table");
72			break;
73		case E2_RSZ_INODE_REF_UPD_PASS:
74			label = _("Updating inode references");
75			break;
76		case E2_RSZ_MOVE_ITABLE_PASS:
77			label = _("Moving inode table");
78			break;
79		default:
80			label = _("Unknown pass?!?");
81			break;
82		}
83		printf(_("Begin pass %d (max = %lu)\n"), pass, max);
84		retval = ext2fs_progress_init(&progress, label, 30,
85					      40, max, 0);
86		if (retval)
87			progress = 0;
88		rfs->prog_data = (void *) progress;
89	}
90	if (progress)
91		ext2fs_progress_update(progress, cur);
92	if (cur >= max) {
93		if (progress)
94			ext2fs_progress_close(progress);
95		progress = 0;
96		rfs->prog_data = 0;
97	}
98	return 0;
99}
100
101static void determine_fs_stride(ext2_filsys fs)
102{
103	unsigned int	group;
104	unsigned long long sum;
105	unsigned int	has_sb, prev_has_sb = 0, num;
106	int		i_stride, b_stride;
107
108	if (fs->stride)
109		return;
110	num = 0; sum = 0;
111	for (group = 0; group < fs->group_desc_count; group++) {
112		has_sb = ext2fs_bg_has_super(fs, group);
113		if (group == 0 || has_sb != prev_has_sb)
114			goto next;
115		b_stride = ext2fs_block_bitmap_loc(fs, group) -
116			ext2fs_block_bitmap_loc(fs, group - 1) -
117			fs->super->s_blocks_per_group;
118		i_stride = ext2fs_inode_bitmap_loc(fs, group) -
119			ext2fs_inode_bitmap_loc(fs, group - 1) -
120			fs->super->s_blocks_per_group;
121		if (b_stride != i_stride ||
122		    b_stride < 0)
123			goto next;
124
125		/* printf("group %d has stride %d\n", group, b_stride); */
126		sum += b_stride;
127		num++;
128
129	next:
130		prev_has_sb = has_sb;
131	}
132
133	if (fs->group_desc_count > 12 && num < 3)
134		sum = 0;
135
136	if (num)
137		fs->stride = sum / num;
138	else
139		fs->stride = 0;
140
141	fs->super->s_raid_stride = fs->stride;
142	ext2fs_mark_super_dirty(fs);
143
144#if 0
145	if (fs->stride)
146		printf("Using RAID stride of %d\n", fs->stride);
147#endif
148}
149
150static void bigalloc_check(ext2_filsys fs, int force)
151{
152	if (!force && EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
153				EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
154		fprintf(stderr, _("\nResizing bigalloc file systems has "
155				  "not been fully tested.  Proceed\n"
156				  "at your own risk!  Use the force option "
157				  "if you want to go ahead anyway.\n\n"));
158		exit(1);
159	}
160}
161
162int main (int argc, char ** argv)
163{
164	errcode_t	retval;
165	ext2_filsys	fs;
166	int		c;
167	int		flags = 0;
168	int		flush = 0;
169	int		force = 0;
170	int		io_flags = 0;
171	int		force_min_size = 0;
172	int		print_min_size = 0;
173	int		fd, ret;
174	blk64_t		new_size = 0;
175	blk64_t		max_size = 0;
176	blk64_t		min_size = 0;
177	io_manager	io_ptr;
178	char		*new_size_str = 0;
179	int		use_stride = -1;
180	ext2fs_struct_stat st_buf;
181	__s64		new_file_size;
182	unsigned int	sys_page_size = 4096;
183	long		sysval;
184	int		len, mount_flags;
185	char		*mtpt;
186
187#ifdef ENABLE_NLS
188	setlocale(LC_MESSAGES, "");
189	setlocale(LC_CTYPE, "");
190	bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
191	textdomain(NLS_CAT_NAME);
192	set_com_err_gettext(gettext);
193#endif
194
195	add_error_table(&et_ext2_error_table);
196
197	fprintf (stderr, "resize2fs %s (%s)\n",
198		 E2FSPROGS_VERSION, E2FSPROGS_DATE);
199	if (argc && *argv)
200		program_name = *argv;
201
202	while ((c = getopt (argc, argv, "d:fFhMPpS:")) != EOF) {
203		switch (c) {
204		case 'h':
205			usage(program_name);
206			break;
207		case 'f':
208			force = 1;
209			break;
210		case 'F':
211			flush = 1;
212			break;
213		case 'M':
214			force_min_size = 1;
215			break;
216		case 'P':
217			print_min_size = 1;
218			break;
219		case 'd':
220			flags |= atoi(optarg);
221			break;
222		case 'p':
223			flags |= RESIZE_PERCENT_COMPLETE;
224			break;
225		case 'S':
226			use_stride = atoi(optarg);
227			break;
228		default:
229			usage(program_name);
230		}
231	}
232	if (optind == argc)
233		usage(program_name);
234
235	device_name = argv[optind++];
236	if (optind < argc)
237		new_size_str = argv[optind++];
238	if (optind < argc)
239		usage(program_name);
240
241	io_options = strchr(device_name, '?');
242	if (io_options)
243		*io_options++ = 0;
244
245	/*
246	 * Figure out whether or not the device is mounted, and if it is
247	 * where it is mounted.
248	 */
249	len=80;
250	while (1) {
251		mtpt = malloc(len);
252		if (!mtpt)
253			return ENOMEM;
254		mtpt[len-1] = 0;
255		retval = ext2fs_check_mount_point(device_name, &mount_flags,
256						  mtpt, len);
257		if (retval) {
258			com_err("ext2fs_check_mount_point", retval,
259				_("while determining whether %s is mounted."),
260				device_name);
261			exit(1);
262		}
263		if (!(mount_flags & EXT2_MF_MOUNTED) || (mtpt[len-1] == 0))
264			break;
265		free(mtpt);
266		len = 2 * len;
267	}
268
269	fd = ext2fs_open_file(device_name, O_RDWR, 0);
270	if (fd < 0) {
271		com_err("open", errno, _("while opening %s"),
272			device_name);
273		exit(1);
274	}
275
276	ret = ext2fs_fstat(fd, &st_buf);
277	if (ret < 0) {
278		com_err("open", errno,
279			_("while getting stat information for %s"),
280			device_name);
281		exit(1);
282	}
283
284	if (flush) {
285		retval = ext2fs_sync_device(fd, 1);
286		if (retval) {
287			com_err(argv[0], retval,
288				_("while trying to flush %s"),
289				device_name);
290			exit(1);
291		}
292	}
293
294	if (!S_ISREG(st_buf.st_mode )) {
295		close(fd);
296		fd = -1;
297	}
298
299#ifdef CONFIG_TESTIO_DEBUG
300	if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
301		io_ptr = test_io_manager;
302		test_io_backing_manager = unix_io_manager;
303	} else
304#endif
305		io_ptr = unix_io_manager;
306
307	if (!(mount_flags & EXT2_MF_MOUNTED))
308		io_flags = EXT2_FLAG_RW | EXT2_FLAG_EXCLUSIVE;
309
310	io_flags |= EXT2_FLAG_64BITS;
311
312	retval = ext2fs_open2(device_name, io_options, io_flags,
313			      0, 0, io_ptr, &fs);
314	if (retval) {
315		com_err (program_name, retval, _("while trying to open %s"),
316			 device_name);
317		printf (_("Couldn't find valid filesystem superblock.\n"));
318		exit (1);
319	}
320
321	/*
322	 * Check for compatibility with the feature sets.  We need to
323	 * be more stringent than ext2fs_open().
324	 */
325	if (fs->super->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) {
326		com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
327			"(%s)", device_name);
328		exit(1);
329	}
330
331	min_size = calculate_minimum_resize_size(fs);
332
333	if (print_min_size) {
334		if (!force && ((fs->super->s_state & EXT2_ERROR_FS) ||
335			       ((fs->super->s_state & EXT2_VALID_FS) == 0))) {
336			fprintf(stderr,
337				_("Please run 'e2fsck -f %s' first.\n\n"),
338				device_name);
339			exit(1);
340		}
341		printf(_("Estimated minimum size of the filesystem: %llu\n"),
342		       min_size);
343		exit(0);
344	}
345
346	/* Determine the system page size if possible */
347#ifdef HAVE_SYSCONF
348#if (!defined(_SC_PAGESIZE) && defined(_SC_PAGE_SIZE))
349#define _SC_PAGESIZE _SC_PAGE_SIZE
350#endif
351#ifdef _SC_PAGESIZE
352	sysval = sysconf(_SC_PAGESIZE);
353	if (sysval > 0)
354		sys_page_size = sysval;
355#endif /* _SC_PAGESIZE */
356#endif /* HAVE_SYSCONF */
357
358	/*
359	 * Get the size of the containing partition, and use this for
360	 * defaults and for making sure the new filesystem doesn't
361	 * exceed the partition size.
362	 */
363	retval = ext2fs_get_device_size2(device_name, fs->blocksize,
364					 &max_size);
365	if (retval) {
366		com_err(program_name, retval,
367			_("while trying to determine filesystem size"));
368		exit(1);
369	}
370	if (force_min_size)
371		new_size = min_size;
372	else if (new_size_str) {
373		new_size = parse_num_blocks2(new_size_str,
374					     fs->super->s_log_block_size);
375		if (new_size == 0) {
376			com_err(program_name, 0,
377				_("Invalid new size: %s\n"), new_size_str);
378			exit(1);
379		}
380	} else {
381		new_size = max_size;
382		/* Round down to an even multiple of a pagesize */
383		if (sys_page_size > fs->blocksize)
384			new_size &= ~((sys_page_size / fs->blocksize)-1);
385	}
386	if (!EXT2_HAS_INCOMPAT_FEATURE(fs->super,
387				       EXT4_FEATURE_INCOMPAT_64BIT)) {
388		/* Take 16T down to 2^32-1 blocks */
389		if (new_size == (1ULL << 32))
390			new_size--;
391		else if (new_size > (1ULL << 32)) {
392			com_err(program_name, 0,
393				_("New size too large to be "
394				  "expressed in 32 bits\n"));
395			exit(1);
396		}
397	}
398
399	if (!force && new_size < min_size) {
400		com_err(program_name, 0,
401			_("New size smaller than minimum (%llu)\n"), min_size);
402		exit(1);
403	}
404	if (use_stride >= 0) {
405		if (use_stride >= (int) fs->super->s_blocks_per_group) {
406			com_err(program_name, 0,
407				_("Invalid stride length"));
408			exit(1);
409		}
410		fs->stride = fs->super->s_raid_stride = use_stride;
411		ext2fs_mark_super_dirty(fs);
412	} else
413		  determine_fs_stride(fs);
414
415	/*
416	 * If we are resizing a plain file, and it's not big enough,
417	 * automatically extend it in a sparse fashion by writing the
418	 * last requested block.
419	 */
420	new_file_size = ((__u64) new_size) * fs->blocksize;
421	if ((__u64) new_file_size >
422	    (((__u64) 1) << (sizeof(st_buf.st_size)*8 - 1)) - 1)
423		fd = -1;
424	if ((new_file_size > st_buf.st_size) &&
425	    (fd > 0)) {
426		if ((ext2fs_llseek(fd, new_file_size-1, SEEK_SET) >= 0) &&
427		    (write(fd, "0", 1) == 1))
428			max_size = new_size;
429	}
430	if (!force && (new_size > max_size)) {
431		fprintf(stderr, _("The containing partition (or device)"
432			" is only %llu (%dk) blocks.\nYou requested a new size"
433			" of %llu blocks.\n\n"), max_size,
434			fs->blocksize / 1024, new_size);
435		exit(1);
436	}
437	if (new_size == ext2fs_blocks_count(fs->super)) {
438		fprintf(stderr, _("The filesystem is already %llu blocks "
439			"long.  Nothing to do!\n\n"), new_size);
440		exit(0);
441	}
442	if (mount_flags & EXT2_MF_MOUNTED) {
443		bigalloc_check(fs, force);
444		retval = online_resize_fs(fs, mtpt, &new_size, flags);
445	} else {
446		if (!force && ((fs->super->s_lastcheck < fs->super->s_mtime) ||
447			       (fs->super->s_state & EXT2_ERROR_FS) ||
448			       ((fs->super->s_state & EXT2_VALID_FS) == 0))) {
449			fprintf(stderr,
450				_("Please run 'e2fsck -f %s' first.\n\n"),
451				device_name);
452			exit(1);
453		}
454		bigalloc_check(fs, force);
455		printf(_("Resizing the filesystem on "
456			 "%s to %llu (%dk) blocks.\n"),
457		       device_name, new_size, fs->blocksize / 1024);
458		retval = resize_fs(fs, &new_size, flags,
459				   ((flags & RESIZE_PERCENT_COMPLETE) ?
460				    resize_progress_func : 0));
461	}
462	free(mtpt);
463	if (retval) {
464		com_err(program_name, retval, _("while trying to resize %s"),
465			device_name);
466		fprintf(stderr,
467			_("Please run 'e2fsck -fy %s' to fix the filesystem\n"
468			  "after the aborted resize operation.\n"),
469			device_name);
470		ext2fs_close(fs);
471		exit(1);
472	}
473	printf(_("The filesystem on %s is now %llu blocks long.\n\n"),
474	       device_name, new_size);
475
476	if ((st_buf.st_size > new_file_size) &&
477	    (fd > 0)) {
478#ifdef HAVE_FTRUNCATE64
479		retval = ftruncate64(fd, new_file_size);
480#else
481		retval = 0;
482		/* Only truncate if new_file_size doesn't overflow off_t */
483		if (((off_t) new_file_size) == new_file_size)
484			retval = ftruncate(fd, (off_t) new_file_size);
485#endif
486		if (retval)
487			com_err(program_name, retval,
488				_("while trying to truncate %s"),
489				device_name);
490	}
491	if (fd > 0)
492		close(fd);
493	remove_error_table(&et_ext2_error_table);
494	return (0);
495}
496