Contents of /trunk/mkinitrd-magellan/busybox/e2fsprogs/e2fs_lib.c
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Revision 532 -
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 4348 byte(s)
Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 4348 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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(x) x |
16 | #define IF_LONG_IS_WIDER(x) |
17 | #else |
18 | #define IF_LONG_IS_SAME(x) |
19 | #define IF_LONG_IS_WIDER(x) x |
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 | struct flags_name { |
145 | unsigned long flag; |
146 | char short_name; |
147 | const char *long_name; |
148 | }; |
149 | |
150 | static const struct flags_name flags_array[] = { |
151 | { EXT2_SECRM_FL, 's', "Secure_Deletion" }, |
152 | { EXT2_UNRM_FL, 'u' , "Undelete" }, |
153 | { EXT2_SYNC_FL, 'S', "Synchronous_Updates" }, |
154 | { EXT2_DIRSYNC_FL, 'D', "Synchronous_Directory_Updates" }, |
155 | { EXT2_IMMUTABLE_FL, 'i', "Immutable" }, |
156 | { EXT2_APPEND_FL, 'a', "Append_Only" }, |
157 | { EXT2_NODUMP_FL, 'd', "No_Dump" }, |
158 | { EXT2_NOATIME_FL, 'A', "No_Atime" }, |
159 | { EXT2_COMPR_FL, 'c', "Compression_Requested" }, |
160 | #ifdef ENABLE_COMPRESSION |
161 | { EXT2_COMPRBLK_FL, 'B', "Compressed_File" }, |
162 | { EXT2_DIRTY_FL, 'Z', "Compressed_Dirty_File" }, |
163 | { EXT2_NOCOMPR_FL, 'X', "Compression_Raw_Access" }, |
164 | { EXT2_ECOMPR_FL, 'E', "Compression_Error" }, |
165 | #endif |
166 | { EXT3_JOURNAL_DATA_FL, 'j', "Journaled_Data" }, |
167 | { EXT2_INDEX_FL, 'I', "Indexed_directory" }, |
168 | { EXT2_NOTAIL_FL, 't', "No_Tailmerging" }, |
169 | { EXT2_TOPDIR_FL, 'T', "Top_of_Directory_Hierarchies" }, |
170 | { 0, '\0', NULL } |
171 | }; |
172 | |
173 | void print_flags(FILE *f, unsigned long flags, unsigned options) |
174 | { |
175 | const struct flags_name *fp; |
176 | |
177 | if (options & PFOPT_LONG) { |
178 | int first = 1; |
179 | for (fp = flags_array; fp->short_name; fp++) { |
180 | if (flags & fp->flag) { |
181 | if (!first) |
182 | fputs(", ", f); |
183 | fputs(fp->long_name, f); |
184 | first = 0; |
185 | } |
186 | } |
187 | if (first) |
188 | fputs("---", f); |
189 | } else { |
190 | for (fp = flags_array; fp->short_name; fp++) { |
191 | char c = '-'; |
192 | if (flags & fp->flag) |
193 | c = fp->short_name; |
194 | fputc(c, f); |
195 | } |
196 | } |
197 | } |