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Commit | Line | Data |
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c6bd0c97 TT |
1 | /* |
2 | * setsuper.c --- set a superblock value | |
3 | */ | |
4 | ||
5 | #include <stdio.h> | |
6 | #include <unistd.h> | |
7 | #include <stdlib.h> | |
8 | #include <ctype.h> | |
9 | #include <string.h> | |
10 | #include <time.h> | |
11 | #include <sys/types.h> | |
12 | #include <sys/stat.h> | |
13 | #ifdef HAVE_ERRNO_H | |
14 | #include <errno.h> | |
15 | #endif | |
16 | #include <fcntl.h> | |
17 | #include <utime.h> | |
18 | ||
19 | #include "debugfs.h" | |
20 | ||
21 | static struct ext2_super_block set_sb; | |
22 | ||
23 | struct super_set_info { | |
b044c2e0 | 24 | const char *name; |
c6bd0c97 TT |
25 | void *ptr; |
26 | int size; | |
27 | errcode_t (*func)(struct super_set_info *info, char *arg); | |
28 | }; | |
29 | ||
30 | static errcode_t parse_uint(struct super_set_info *info, char *arg); | |
31 | static errcode_t parse_int(struct super_set_info *info, char *arg); | |
32 | static errcode_t parse_string(struct super_set_info *info, char *arg); | |
33 | ||
34 | static struct super_set_info super_fields[] = { | |
35 | { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, | |
36 | { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint }, | |
37 | { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint }, | |
38 | { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint }, | |
39 | { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint }, | |
40 | { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint }, | |
41 | { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint }, | |
42 | { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int }, | |
43 | { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint }, | |
44 | { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint }, | |
45 | { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint }, | |
46 | /* s_mtime (time_t) */ | |
47 | /* s_wtime (time_t) */ | |
48 | { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint }, | |
49 | { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int }, | |
50 | /* s_magic */ | |
51 | { "state", &set_sb.s_state, 2, parse_uint }, | |
52 | { "errors", &set_sb.s_errors, 2, parse_uint }, | |
53 | { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint }, | |
54 | /* s_lastcheck (time_t) */ | |
55 | { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint }, | |
56 | { "creator_os", &set_sb.s_creator_os, 4, parse_uint }, | |
57 | { "rev_level", &set_sb.s_rev_level, 4, parse_uint }, | |
58 | { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint }, | |
59 | { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint }, | |
60 | { "first_ino", &set_sb.s_first_ino, 4, parse_uint }, | |
426d734f | 61 | { "inode_size", &set_sb.s_inode_size, 2, parse_uint }, |
c6bd0c97 TT |
62 | { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint }, |
63 | { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint }, | |
64 | { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint }, | |
65 | { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint }, | |
66 | /* __u8 s_uuid[16]; */ | |
67 | { "volume_name", &set_sb.s_volume_name, 16, parse_string }, | |
68 | { "last_mounted", &set_sb.s_last_mounted, 64, parse_string }, | |
69 | { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, | |
70 | 4, parse_uint }, | |
71 | { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint }, | |
72 | { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1, | |
73 | parse_uint }, | |
74 | /* s_padding1 */ | |
75 | /* s_journal_uuid */ | |
76 | { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint }, | |
77 | { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint }, | |
78 | { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint }, | |
79 | ||
80 | { 0, 0, 0, 0 } | |
81 | }; | |
82 | ||
83 | static struct super_set_info *find_field(char *field) | |
84 | { | |
85 | struct super_set_info *ss; | |
86 | ||
3db9305a TT |
87 | if (strncmp(field, "s_", 2) == 0) |
88 | field += 2; | |
c6bd0c97 TT |
89 | for (ss = super_fields ; ss->name ; ss++) { |
90 | if (strcmp(ss->name, field) == 0) | |
91 | return ss; | |
92 | } | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | static errcode_t parse_uint(struct super_set_info *info, char *arg) | |
97 | { | |
98 | unsigned long num; | |
99 | char *tmp; | |
100 | __u32 *ptr32; | |
101 | __u16 *ptr16; | |
102 | __u8 *ptr8; | |
103 | ||
104 | num = strtoul(arg, &tmp, 0); | |
105 | if (*tmp) { | |
106 | fprintf(stderr, "Couldn't parse '%s' for field %s.\n", | |
107 | arg, info->name); | |
108 | return EINVAL; | |
109 | } | |
110 | switch (info->size) { | |
111 | case 4: | |
112 | ptr32 = (__u32 *) info->ptr; | |
113 | *ptr32 = num; | |
114 | break; | |
115 | case 2: | |
116 | ptr16 = (__u16 *) info->ptr; | |
117 | *ptr16 = num; | |
118 | break; | |
119 | case 1: | |
120 | ptr8 = (__u8 *) info->ptr; | |
121 | *ptr8 = num; | |
122 | break; | |
123 | } | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static errcode_t parse_int(struct super_set_info *info, char *arg) | |
128 | { | |
129 | long num; | |
130 | char *tmp; | |
131 | __s32 *ptr32; | |
132 | __s16 *ptr16; | |
133 | __s8 *ptr8; | |
134 | ||
135 | num = strtol(arg, &tmp, 0); | |
136 | if (*tmp) { | |
137 | fprintf(stderr, "Couldn't parse '%s' for field %s.\n", | |
138 | arg, info->name); | |
139 | return EINVAL; | |
140 | } | |
141 | switch (info->size) { | |
142 | case 4: | |
143 | ptr32 = (__s32 *) info->ptr; | |
144 | *ptr32 = num; | |
145 | break; | |
146 | case 2: | |
147 | ptr16 = (__s16 *) info->ptr; | |
148 | *ptr16 = num; | |
149 | break; | |
150 | case 1: | |
151 | ptr8 = (__s8 *) info->ptr; | |
152 | *ptr8 = num; | |
153 | break; | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static errcode_t parse_string(struct super_set_info *info, char *arg) | |
159 | { | |
160 | char *cp = (char *) info->ptr; | |
161 | ||
162 | if (strlen(arg) >= info->size) { | |
163 | fprintf(stderr, "Error maximum size for %s is %d.\n", | |
164 | info->name, info->size); | |
165 | return EINVAL; | |
166 | } | |
167 | strcpy(cp, arg); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | void do_set_super(int argc, char *argv[]) | |
172 | { | |
c6bd0c97 TT |
173 | static struct super_set_info *ss; |
174 | ||
175 | if (check_fs_open(argv[0])) | |
176 | return; | |
177 | ||
178 | if (argc != 3) { | |
179 | com_err(argv[0], 0, "Usage: set_super <field> <value>"); | |
180 | return; | |
181 | } | |
182 | ||
183 | if (check_fs_read_write(argv[0])) | |
184 | return; | |
185 | ||
186 | if ((ss = find_field(argv[1])) == 0) { | |
187 | com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); | |
188 | return; | |
189 | } | |
190 | set_sb = *current_fs->super; | |
191 | if (ss->func(ss, argv[2]) == 0) { | |
192 | *current_fs->super = set_sb; | |
193 | ext2fs_mark_super_dirty(current_fs); | |
194 | } | |
195 | } |