Contents of /tags/mkinitrd-6_1_3/busybox/e2fsprogs/e2fs_lib.c
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 4466 byte(s)
Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 4466 byte(s)
tagged 'mkinitrd-6_1_3'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * See README for additional information |
4 | * |
5 | * This file can be redistributed under the terms of the GNU Library General |
6 | * Public License |
7 | */ |
8 | |
9 | #include "libbb.h" |
10 | #include "e2fs_lib.h" |
11 | |
12 | #define HAVE_EXT2_IOCTLS 1 |
13 | |
14 | #if INT_MAX == LONG_MAX |
15 | #define IF_LONG_IS_SAME(...) __VA_ARGS__ |
16 | #define IF_LONG_IS_WIDER(...) |
17 | #else |
18 | #define IF_LONG_IS_SAME(...) |
19 | #define IF_LONG_IS_WIDER(...) __VA_ARGS__ |
20 | #endif |
21 | |
22 | static void close_silently(int fd) |
23 | { |
24 | int e = errno; |
25 | close(fd); |
26 | errno = e; |
27 | } |
28 | |
29 | |
30 | /* Iterate a function on each entry of a directory */ |
31 | int iterate_on_dir(const char *dir_name, |
32 | int (*func)(const char *, struct dirent *, void *), |
33 | void * private) |
34 | { |
35 | DIR *dir; |
36 | struct dirent *de, *dep; |
37 | int max_len, len; |
38 | |
39 | max_len = PATH_MAX + sizeof(struct dirent); |
40 | de = xmalloc(max_len+1); |
41 | memset(de, 0, max_len+1); |
42 | |
43 | dir = opendir(dir_name); |
44 | if (dir == NULL) { |
45 | free(de); |
46 | return -1; |
47 | } |
48 | while ((dep = readdir(dir))) { |
49 | len = sizeof(struct dirent); |
50 | if (len < dep->d_reclen) |
51 | len = dep->d_reclen; |
52 | if (len > max_len) |
53 | len = max_len; |
54 | memcpy(de, dep, len); |
55 | func(dir_name, de, private); |
56 | } |
57 | closedir(dir); |
58 | free(de); |
59 | return 0; |
60 | } |
61 | |
62 | |
63 | /* Get/set a file version on an ext2 file system */ |
64 | int fgetsetversion(const char *name, unsigned long *get_version, unsigned long set_version) |
65 | { |
66 | #if HAVE_EXT2_IOCTLS |
67 | int fd, r; |
68 | IF_LONG_IS_WIDER(int ver;) |
69 | |
70 | fd = open(name, O_NONBLOCK); |
71 | if (fd == -1) |
72 | return -1; |
73 | if (!get_version) { |
74 | IF_LONG_IS_WIDER( |
75 | ver = (int) set_version; |
76 | r = ioctl(fd, EXT2_IOC_SETVERSION, &ver); |
77 | ) |
78 | IF_LONG_IS_SAME( |
79 | r = ioctl(fd, EXT2_IOC_SETVERSION, (void*)&set_version); |
80 | ) |
81 | } else { |
82 | IF_LONG_IS_WIDER( |
83 | r = ioctl(fd, EXT2_IOC_GETVERSION, &ver); |
84 | *get_version = ver; |
85 | ) |
86 | IF_LONG_IS_SAME( |
87 | r = ioctl(fd, EXT2_IOC_GETVERSION, (void*)get_version); |
88 | ) |
89 | } |
90 | close_silently(fd); |
91 | return r; |
92 | #else /* ! HAVE_EXT2_IOCTLS */ |
93 | errno = EOPNOTSUPP; |
94 | return -1; |
95 | #endif /* ! HAVE_EXT2_IOCTLS */ |
96 | } |
97 | |
98 | |
99 | /* Get/set a file flags on an ext2 file system */ |
100 | int fgetsetflags(const char *name, unsigned long *get_flags, unsigned long set_flags) |
101 | { |
102 | #if HAVE_EXT2_IOCTLS |
103 | struct stat buf; |
104 | int fd, r; |
105 | IF_LONG_IS_WIDER(int f;) |
106 | |
107 | if (stat(name, &buf) == 0 /* stat is ok */ |
108 | && !S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) |
109 | ) { |
110 | goto notsupp; |
111 | } |
112 | fd = open(name, O_NONBLOCK); /* neither read nor write asked for */ |
113 | if (fd == -1) |
114 | return -1; |
115 | |
116 | if (!get_flags) { |
117 | IF_LONG_IS_WIDER( |
118 | f = (int) set_flags; |
119 | r = ioctl(fd, EXT2_IOC_SETFLAGS, &f); |
120 | ) |
121 | IF_LONG_IS_SAME( |
122 | r = ioctl(fd, EXT2_IOC_SETFLAGS, (void*)&set_flags); |
123 | ) |
124 | } else { |
125 | IF_LONG_IS_WIDER( |
126 | r = ioctl(fd, EXT2_IOC_GETFLAGS, &f); |
127 | *get_flags = f; |
128 | ) |
129 | IF_LONG_IS_SAME( |
130 | r = ioctl(fd, EXT2_IOC_GETFLAGS, (void*)get_flags); |
131 | ) |
132 | } |
133 | |
134 | close_silently(fd); |
135 | return r; |
136 | notsupp: |
137 | #endif /* HAVE_EXT2_IOCTLS */ |
138 | errno = EOPNOTSUPP; |
139 | return -1; |
140 | } |
141 | |
142 | |
143 | /* Print file attributes on an ext2 file system */ |
144 | const uint32_t e2attr_flags_value[] = { |
145 | #ifdef ENABLE_COMPRESSION |
146 | EXT2_COMPRBLK_FL, |
147 | EXT2_DIRTY_FL, |
148 | EXT2_NOCOMPR_FL, |
149 | EXT2_ECOMPR_FL, |
150 | #endif |
151 | EXT2_INDEX_FL, |
152 | EXT2_SECRM_FL, |
153 | EXT2_UNRM_FL, |
154 | EXT2_SYNC_FL, |
155 | EXT2_DIRSYNC_FL, |
156 | EXT2_IMMUTABLE_FL, |
157 | EXT2_APPEND_FL, |
158 | EXT2_NODUMP_FL, |
159 | EXT2_NOATIME_FL, |
160 | EXT2_COMPR_FL, |
161 | EXT3_JOURNAL_DATA_FL, |
162 | EXT2_NOTAIL_FL, |
163 | EXT2_TOPDIR_FL |
164 | }; |
165 | |
166 | const char e2attr_flags_sname[] = |
167 | #ifdef ENABLE_COMPRESSION |
168 | "BZXE" |
169 | #endif |
170 | "I" |
171 | "suSDiadAcjtT"; |
172 | |
173 | static const char e2attr_flags_lname[] = |
174 | #ifdef ENABLE_COMPRESSION |
175 | "Compressed_File" "\0" |
176 | "Compressed_Dirty_File" "\0" |
177 | "Compression_Raw_Access" "\0" |
178 | "Compression_Error" "\0" |
179 | #endif |
180 | "Indexed_directory" "\0" |
181 | "Secure_Deletion" "\0" |
182 | "Undelete" "\0" |
183 | "Synchronous_Updates" "\0" |
184 | "Synchronous_Directory_Updates" "\0" |
185 | "Immutable" "\0" |
186 | "Append_Only" "\0" |
187 | "No_Dump" "\0" |
188 | "No_Atime" "\0" |
189 | "Compression_Requested" "\0" |
190 | "Journaled_Data" "\0" |
191 | "No_Tailmerging" "\0" |
192 | "Top_of_Directory_Hierarchies" "\0" |
193 | /* Another trailing NUL is added by compiler */; |
194 | |
195 | void print_e2flags(FILE *f, unsigned long flags, unsigned options) |
196 | { |
197 | const uint32_t *fv; |
198 | const char *fn; |
199 | |
200 | fv = e2attr_flags_value; |
201 | if (options & PFOPT_LONG) { |
202 | int first = 1; |
203 | fn = e2attr_flags_lname; |
204 | do { |
205 | if (flags & *fv) { |
206 | if (!first) |
207 | fputs(", ", f); |
208 | fputs(fn, f); |
209 | first = 0; |
210 | } |
211 | fv++; |
212 | fn += strlen(fn) + 1; |
213 | } while (*fn); |
214 | if (first) |
215 | fputs("---", f); |
216 | } else { |
217 | fn = e2attr_flags_sname; |
218 | do { |
219 | char c = '-'; |
220 | if (flags & *fv) |
221 | c = *fn; |
222 | fputc(c, f); |
223 | fv++; |
224 | fn++; |
225 | } while (*fn); |
226 | } |
227 | } |