main.c revision 2a3013b80704b7d9128cbe2c746550e570eb5a02 
1/*
2 * main.c --- ext2 resizer main program
3 *
4 * Copyright (C) 1997 Theodore Ts'o
5 *
6 * %Begin-Header%
7 * All rights reserved.
8 * %End-Header%
9 */
10
11#ifdef HAVE_GETOPT_H
12#include <getopt.h>
13#endif
14#include <fcntl.h>
15#include <sys/ioctl.h>
16
17
18#include "resize2fs.h"
19
20#include "./version.h"
21
22char *program_name, *device_name;
23
24static volatile void usage (char *prog)
25{
26	fprintf (stderr, "usage: %s [-d debug_flags] [-f] [-F] [-p] device new-size\n", prog);
27	exit (1);
28}
29
30static errcode_t resize_progress_func(ext2_resize_t rfs, int pass,
31				      unsigned long cur, unsigned long max)
32{
33	ext2_sim_progmeter progress;
34	const char	*label;
35	errcode_t	retval;
36
37	progress = (ext2_sim_progmeter) rfs->prog_data;
38	if (max == 0)
39		return 0;
40	if (cur == 0) {
41		if (progress)
42			ext2fs_progress_close(progress);
43		progress = 0;
44		switch (pass) {
45		case E2_RSZ_EXTEND_ITABLE_PASS:
46			label = "Extending the inode table";
47			break;
48		case E2_RSZ_BLOCK_RELOC_PASS:
49			label = "Relocating blocks";
50			break;
51		case E2_RSZ_INODE_SCAN_PASS:
52			label = "Scanning inode table";
53			break;
54		case E2_RSZ_INODE_REF_UPD_PASS:
55			label = "Updating inode references";
56			break;
57		case E2_RSZ_MOVE_ITABLE_PASS:
58			label = "Moving inode table";
59			break;
60		default:
61			label = "Unknown pass?!?";
62			break;
63		}
64		printf("Begin pass %d (max = %lu)\n", pass, max);
65		retval = ext2fs_progress_init(&progress, label, 30,
66					      40, max, 0);
67		if (retval)
68			progress = 0;
69		rfs->prog_data = (void *) progress;
70	}
71	if (progress)
72		ext2fs_progress_update(progress, cur);
73	if (cur >= max) {
74		if (progress)
75			ext2fs_progress_close(progress);
76		progress = 0;
77		rfs->prog_data = 0;
78	}
79	return 0;
80}
81
82static void check_mount(char *device)
83{
84	errcode_t	retval;
85	int		mount_flags;
86
87	retval = ext2fs_check_if_mounted(device, &mount_flags);
88	if (retval) {
89		com_err("ext2fs_check_if_mount", retval,
90			"while determining whether %s is mounted.",
91			device);
92		return;
93	}
94	if (!(mount_flags & EXT2_MF_MOUNTED))
95		return;
96
97	fprintf(stderr, "%s is mounted; can't resize a "
98		"mounted filesystem!\n\n", device);
99	exit(1);
100}
101
102
103void main (int argc, char ** argv)
104{
105	errcode_t	retval;
106	ext2_filsys	fs;
107	int		c;
108	int		flags = 0;
109	int		flush = 0;
110	int		force = 0;
111	int		fd;
112	blk_t		new_size = 0;
113	blk_t		max_size = 0;
114	io_manager	io_ptr;
115	char		*tmp;
116	struct ext2fs_sb *s;
117
118	initialize_ext2_error_table();
119
120	fprintf (stderr, "resize2fs %s (%s)\n",
121		 E2FSPROGS_VERSION, E2FSPROGS_DATE);
122	fprintf(stderr, "Copyright 1998 by Theodore Ts'o and PowerQuest, Inc.  All Rights Reserved.\n\n");
123	if (argc && *argv)
124		program_name = *argv;
125
126	while ((c = getopt (argc, argv, "d:fFhp")) != EOF) {
127		switch (c) {
128		case 'h':
129			usage(program_name);
130			break;
131		case 'f':
132			force = 1;
133			break;
134		case 'F':
135			flush = 1;
136			break;
137		case 'd':
138			flags |= atoi(optarg);
139			break;
140		case 'p':
141			flags |= RESIZE_PERCENT_COMPLETE;
142			break;
143		default:
144			usage(program_name);
145		}
146	}
147	if (optind == argc)
148		usage(program_name);
149	device_name = argv[optind++];
150	if (optind < argc) {
151		new_size = strtoul(argv[optind++], &tmp, 0);
152		if (*tmp) {
153			com_err(program_name, 0, "bad filesystem size - %s",
154				argv[optind - 1]);
155			exit(1);
156		}
157	}
158	if (optind < argc)
159		usage(program_name);
160
161	check_mount(device_name);
162
163	if (flush) {
164#ifdef BLKFLSBUF
165		fd = open(device_name, O_RDONLY, 0);
166
167		if (fd < 0) {
168			com_err("open", errno, "while opening %s for flushing",
169				device_name);
170			exit(1);
171		}
172		if (ioctl(fd, BLKFLSBUF, 0) < 0) {
173			com_err("BLKFLSBUF", errno, "while trying to flush %s",
174				device_name);
175			exit(1);
176		}
177		close(fd);
178#else
179		fprintf(stderr, "BLKFLSBUF not supported");
180		exit(1);
181#endif /* BLKFLSBUF */
182	}
183
184	if (flags & RESIZE_DEBUG_IO) {
185		io_ptr = test_io_manager;
186		test_io_backing_manager = unix_io_manager;
187	} else
188		io_ptr = unix_io_manager;
189
190	retval = ext2fs_open (device_name, EXT2_FLAG_RW, 0, 0,
191			      io_ptr, &fs);
192	if (retval) {
193		com_err (program_name, retval, "while trying to open %s",
194			 device_name);
195		printf ("Couldn't find valid filesystem superblock.\n");
196		exit (1);
197	}
198	/*
199	 * Check for compatibility with the feature sets.  We need to
200	 * be more stringent than ext2fs_open().
201	 */
202	s = (struct ext2fs_sb *) fs->super;
203	if ((s->s_feature_compat & ~EXT2_LIB_FEATURE_COMPAT_SUPP) ||
204	    (s->s_feature_incompat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP)) {
205		com_err(program_name, EXT2_ET_UNSUPP_FEATURE,
206			"(%s)", device_name);
207		exit(1);
208	}
209
210	/*
211	 * Get the size of the containing partition, and use this for
212	 * defaults and for making sure the new filesystme doesn't
213	 * exceed the partition size.
214	 */
215	retval = ext2fs_get_device_size(device_name, fs->blocksize,
216					&max_size);
217	if (retval) {
218		com_err(program_name, retval,
219			"while trying to determine filesystem size");
220		exit(1);
221	}
222	if (!new_size)
223		new_size = max_size;
224	if (!force && (new_size > max_size)) {
225		fprintf(stderr, "The containing partition (or device)"
226			" is only %d blocks.\nYou requested a new size"
227			" of %d blocks.\n\n", max_size,
228			new_size);
229		exit(1);
230	}
231	if (new_size == fs->super->s_blocks_count) {
232		fprintf(stderr, "The filesystem is already %d blocks "
233			"long.  Nothing to do!\n\n", new_size);
234		exit(0);
235	}
236	if (!force && (fs->super->s_lastcheck < fs->super->s_mtime)) {
237		fprintf(stderr, "Please run 'e2fsck -f %s' first.\n\n",
238			device_name);
239		exit(1);
240	}
241	retval = resize_fs(fs, new_size, flags,
242			   ((flags & RESIZE_PERCENT_COMPLETE) ?
243			    resize_progress_func : 0));
244	if (retval) {
245		com_err(program_name, retval, "while trying to resize %s",
246			device_name);
247		ext2fs_close (fs);
248	}
249	exit (0);
250}
251