source: MondoRescue/branches/2.2.5/mindi-busybox/e2fsprogs/old_e2fsprogs/util.c @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 12 years ago

Update to busybox 1.7.2

  • Property svn:eol-style set to native
File size: 6.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * util.c --- helper functions used by tune2fs and mke2fs
4 *
5 * Copyright 1995, 1996, 1997, 1998, 1999, 2000 by Theodore Ts'o.
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Public
9 * License.
10 * %End-Header%
11 */
12
13#include <stdio.h>
14#include <string.h>
15#include <errno.h>
16#include <linux/major.h>
17#include <sys/stat.h>
18
19#include "e2fsbb.h"
20#include "e2p/e2p.h"
21#include "ext2fs/ext2_fs.h"
22#include "ext2fs/ext2fs.h"
23#include "blkid/blkid.h"
24#include "util.h"
25
26void proceed_question(void)
27{
28    fputs("Proceed anyway? (y,n) ", stdout);
29    if (bb_ask_confirmation() == 0)
30        exit(1);
31}
32
33void check_plausibility(const char *device, int force)
34{
35    int val;
36    struct stat s;
37    val = stat(device, &s);
38    if (force)
39        return;
40    if(val == -1)
41        bb_perror_msg_and_die("cannot stat %s", device);
42    if (!S_ISBLK(s.st_mode)) {
43        printf("%s is not a block special device.\n", device);
44        proceed_question();
45        return;
46    }
47
48#ifdef HAVE_LINUX_MAJOR_H
49#ifndef MAJOR
50#define MAJOR(dev)  ((dev)>>8)
51#define MINOR(dev)  ((dev) & 0xff)
52#endif
53#ifndef SCSI_BLK_MAJOR
54#ifdef SCSI_DISK0_MAJOR
55#ifdef SCSI_DISK8_MAJOR
56#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
57  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR) || \
58  ((M) >= SCSI_DISK8_MAJOR && (M) <= SCSI_DISK15_MAJOR))
59#else
60#define SCSI_DISK_MAJOR(M) ((M) == SCSI_DISK0_MAJOR || \
61  ((M) >= SCSI_DISK1_MAJOR && (M) <= SCSI_DISK7_MAJOR))
62#endif /* defined(SCSI_DISK8_MAJOR) */
63#define SCSI_BLK_MAJOR(M) (SCSI_DISK_MAJOR((M)) || (M) == SCSI_CDROM_MAJOR)
64#else
65#define SCSI_BLK_MAJOR(M)  ((M) == SCSI_DISK_MAJOR || (M) == SCSI_CDROM_MAJOR)
66#endif /* defined(SCSI_DISK0_MAJOR) */
67#endif /* defined(SCSI_BLK_MAJOR) */
68    if (((MAJOR(s.st_rdev) == HD_MAJOR &&
69          MINOR(s.st_rdev)%64 == 0) ||
70         (SCSI_BLK_MAJOR(MAJOR(s.st_rdev)) &&
71          MINOR(s.st_rdev)%16 == 0))) {
72        printf("%s is entire device, not just one partition!\n", device);
73        proceed_question();
74    }
75#endif
76}
77
78void check_mount(const char *device, int force, const char *type)
79{
80    errcode_t retval;
81    int mount_flags;
82
83    retval = ext2fs_check_if_mounted(device, &mount_flags);
84    if (retval) {
85        bb_error_msg("cannot determine if %s is mounted", device);
86        return;
87    }
88    if (mount_flags & EXT2_MF_MOUNTED) {
89        bb_error_msg("%s is mounted !", device);
90force_check:
91        if (force)
92            bb_error_msg("badblocks forced anyways");
93        else
94            bb_error_msg_and_die("it's not safe to run badblocks!");
95    }
96
97    if (mount_flags & EXT2_MF_BUSY) {
98        bb_error_msg("%s is apparently in use by the system", device);
99        goto force_check;
100    }
101
102}
103
104void parse_journal_opts(char **journal_device, int *journal_flags,
105            int *journal_size, const char *opts)
106{
107    char *buf, *token, *next, *p, *arg;
108    int journal_usage = 0;
109    buf = xstrdup(opts);
110    for (token = buf; token && *token; token = next) {
111        p = strchr(token, ',');
112        next = 0;
113        if (p) {
114            *p = 0;
115            next = p+1;
116        }
117        arg = strchr(token, '=');
118        if (arg) {
119            *arg = 0;
120            arg++;
121        }
122        if (strcmp(token, "device") == 0) {
123            *journal_device = blkid_get_devname(NULL, arg, NULL);
124            if (!journal_device) {
125                journal_usage++;
126                continue;
127            }
128        } else if (strcmp(token, "size") == 0) {
129            if (!arg) {
130                journal_usage++;
131                continue;
132            }
133            (*journal_size) = strtoul(arg, &p, 0);
134            if (*p)
135                journal_usage++;
136        } else if (strcmp(token, "v1_superblock") == 0) {
137            (*journal_flags) |= EXT2_MKJOURNAL_V1_SUPER;
138            continue;
139        } else
140            journal_usage++;
141    }
142    if (journal_usage)
143        bb_error_msg_and_die(
144            "\nBad journal options specified.\n\n"
145            "Journal options are separated by commas, "
146            "and may take an argument which\n"
147            "\tis set off by an equals ('=') sign.\n\n"
148            "Valid journal options are:\n"
149            "\tsize=<journal size in megabytes>\n"
150            "\tdevice=<journal device>\n\n"
151            "The journal size must be between "
152            "1024 and 102400 filesystem blocks.\n\n");
153}
154
155/*
156 * Determine the number of journal blocks to use, either via
157 * user-specified # of megabytes, or via some intelligently selected
158 * defaults.
159 *
160 * Find a reasonable journal file size (in blocks) given the number of blocks
161 * in the filesystem.  For very small filesystems, it is not reasonable to
162 * have a journal that fills more than half of the filesystem.
163 */
164int figure_journal_size(int size, ext2_filsys fs)
165{
166    blk_t j_blocks;
167
168    if (fs->super->s_blocks_count < 2048) {
169        bb_error_msg("Filesystem too small for a journal");
170        return 0;
171    }
172
173    if (size >= 0) {
174        j_blocks = size * 1024 / (fs->blocksize / 1024);
175        if (j_blocks < 1024 || j_blocks > 102400)
176            bb_error_msg_and_die("\nThe requested journal "
177                "size is %d blocks;\n it must be "
178                "between 1024 and 102400 blocks; Aborting",
179                j_blocks);
180        if (j_blocks > fs->super->s_free_blocks_count)
181            bb_error_msg_and_die("Journal size too big for filesystem");
182        return j_blocks;
183    }
184
185    if (fs->super->s_blocks_count < 32768)
186        j_blocks = 1024;
187    else if (fs->super->s_blocks_count < 256*1024)
188        j_blocks = 4096;
189    else if (fs->super->s_blocks_count < 512*1024)
190        j_blocks = 8192;
191    else if (fs->super->s_blocks_count < 1024*1024)
192        j_blocks = 16384;
193    else
194        j_blocks = 32768;
195
196    return j_blocks;
197}
198
199void print_check_message(ext2_filsys fs)
200{
201    printf("This filesystem will be automatically "
202         "checked every %d mounts or\n"
203         "%g days, whichever comes first.  "
204         "Use tune2fs -c or -i to override.\n",
205           fs->super->s_max_mnt_count,
206           (double)fs->super->s_checkinterval / (3600 * 24));
207}
208
209void make_journal_device(char *journal_device, ext2_filsys fs, int quiet, int force)
210{
211    errcode_t   retval;
212    ext2_filsys jfs;
213    io_manager  io_ptr;
214
215    check_plausibility(journal_device, force);
216    check_mount(journal_device, force, "journal");
217    io_ptr = unix_io_manager;
218    retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
219                    EXT2_FLAG_JOURNAL_DEV_OK, 0,
220                    fs->blocksize, io_ptr, &jfs);
221    if (retval)
222        bb_error_msg_and_die("cannot journal device %s", journal_device);
223    if(!quiet)
224        printf("Adding journal to device %s: ", journal_device);
225    fflush(stdout);
226    retval = ext2fs_add_journal_device(fs, jfs);
227    if(retval)
228        bb_error_msg_and_die("\nFailed to add journal to device %s", journal_device);
229    if(!quiet)
230        puts("done");
231    ext2fs_close(jfs);
232}
233
234void make_journal_blocks(ext2_filsys fs, int journal_size, int journal_flags, int quiet)
235{
236    unsigned long journal_blocks;
237    errcode_t   retval;
238
239    journal_blocks = figure_journal_size(journal_size, fs);
240    if (!journal_blocks) {
241        fs->super->s_feature_compat &=
242            ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
243        return;
244    }
245    if(!quiet)
246        printf("Creating journal (%ld blocks): ", journal_blocks);
247    fflush(stdout);
248    retval = ext2fs_add_journal_inode(fs, journal_blocks,
249                          journal_flags);
250    if(retval)
251        bb_error_msg_and_die("cannot create journal");
252    if(!quiet)
253        puts("done");
254}
255
256char *e2fs_set_sbin_path(void)
257{
258    char *oldpath = getenv("PATH");
259    /* Update our PATH to include /sbin  */
260#define PATH_SET "/sbin"
261    if (oldpath)
262        oldpath = xasprintf("%s:%s", PATH_SET, oldpath);
263     else
264        oldpath = PATH_SET;
265    putenv (oldpath);
266    return oldpath;
267}
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