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Commit | Line | Data |
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6dbe3af9 | 1 | /* |
39fde137 KZ |
2 | * Copyright (C) 2011 Karel Zak <kzak@redhat.com> |
3 | * Originally from Ted's losetup.c | |
4 | * | |
6dbe3af9 KZ |
5 | * losetup.c - setup and control loop devices |
6 | */ | |
896352d3 | 7 | #include <assert.h> |
6dbe3af9 KZ |
8 | #include <stdio.h> |
9 | #include <string.h> | |
fd6b7a7f | 10 | #include <errno.h> |
6dbe3af9 KZ |
11 | #include <stdlib.h> |
12 | #include <unistd.h> | |
13 | #include <sys/ioctl.h> | |
fd6b7a7f | 14 | #include <sys/stat.h> |
7711bc17 | 15 | #include <inttypes.h> |
65329058 | 16 | #include <getopt.h> |
6dbe3af9 | 17 | |
7e86cd54 OO |
18 | #include <libsmartcols.h> |
19 | ||
934df30d | 20 | #include "c.h" |
7eda085c | 21 | #include "nls.h" |
934df30d | 22 | #include "strutils.h" |
de4acb05 | 23 | #include "loopdev.h" |
efb8854f | 24 | #include "closestream.h" |
96801c48 | 25 | #include "optutils.h" |
896352d3 | 26 | #include "xalloc.h" |
114ade3d | 27 | #include "canonicalize.h" |
362f5d20 | 28 | #include "pathnames.h" |
96801c48 | 29 | |
39fde137 | 30 | enum { |
c7e0925d | 31 | A_CREATE = 1, /* setup a new device */ |
c654c4f0 KZ |
32 | A_DELETE, /* delete given device(s) */ |
33 | A_DELETE_ALL, /* delete all devices */ | |
39fde137 | 34 | A_SHOW, /* list devices */ |
09ec0c0a | 35 | A_SHOW_ONE, /* print info about one device */ |
39fde137 KZ |
36 | A_FIND_FREE, /* find first unused */ |
37 | A_SET_CAPACITY, /* set device capacity */ | |
64c3bb3c | 38 | A_SET_DIRECT_IO, /* set accessing backing file by direct io */ |
a1a41597 | 39 | A_SET_BLOCKSIZE, /* set logical block size of the loop device */ |
39fde137 KZ |
40 | }; |
41 | ||
896352d3 OO |
42 | enum { |
43 | COL_NAME = 0, | |
44 | COL_AUTOCLR, | |
45 | COL_BACK_FILE, | |
46 | COL_BACK_INO, | |
47 | COL_BACK_MAJMIN, | |
48 | COL_MAJMIN, | |
49 | COL_OFFSET, | |
50 | COL_PARTSCAN, | |
51 | COL_RO, | |
4ad996d7 | 52 | COL_SIZELIMIT, |
faeef4d2 | 53 | COL_DIO, |
76493ceb | 54 | COL_LOGSEC, |
896352d3 OO |
55 | }; |
56 | ||
7e86cd54 OO |
57 | /* basic output flags */ |
58 | static int no_headings; | |
59 | static int raw; | |
4827093d | 60 | static int json; |
896352d3 OO |
61 | |
62 | struct colinfo { | |
63 | const char *name; | |
64 | double whint; | |
65 | int flags; | |
66 | const char *help; | |
46de0fe6 KZ |
67 | |
68 | int json_type; /* default is string */ | |
896352d3 OO |
69 | }; |
70 | ||
71 | static struct colinfo infos[] = { | |
46de0fe6 | 72 | [COL_AUTOCLR] = { "AUTOCLEAR", 1, SCOLS_FL_RIGHT, N_("autoclear flag set"), SCOLS_JSON_BOOLEAN}, |
896352d3 | 73 | [COL_BACK_FILE] = { "BACK-FILE", 0.3, 0, N_("device backing file")}, |
46de0fe6 | 74 | [COL_BACK_INO] = { "BACK-INO", 4, SCOLS_FL_RIGHT, N_("backing file inode number"), SCOLS_JSON_NUMBER}, |
896352d3 OO |
75 | [COL_BACK_MAJMIN] = { "BACK-MAJ:MIN", 6, 0, N_("backing file major:minor device number")}, |
76 | [COL_NAME] = { "NAME", 0.25, 0, N_("loop device name")}, | |
46de0fe6 KZ |
77 | [COL_OFFSET] = { "OFFSET", 5, SCOLS_FL_RIGHT, N_("offset from the beginning"), SCOLS_JSON_NUMBER}, |
78 | [COL_PARTSCAN] = { "PARTSCAN", 1, SCOLS_FL_RIGHT, N_("partscan flag set"), SCOLS_JSON_BOOLEAN}, | |
79 | [COL_RO] = { "RO", 1, SCOLS_FL_RIGHT, N_("read-only device"), SCOLS_JSON_BOOLEAN}, | |
80 | [COL_SIZELIMIT] = { "SIZELIMIT", 5, SCOLS_FL_RIGHT, N_("size limit of the file in bytes"), SCOLS_JSON_NUMBER}, | |
896352d3 | 81 | [COL_MAJMIN] = { "MAJ:MIN", 3, 0, N_("loop device major:minor number")}, |
46de0fe6 KZ |
82 | [COL_DIO] = { "DIO", 1, SCOLS_FL_RIGHT, N_("access backing file with direct-io"), SCOLS_JSON_BOOLEAN}, |
83 | [COL_LOGSEC] = { "LOG-SEC", 4, SCOLS_FL_RIGHT, N_("logical sector size in bytes"), SCOLS_JSON_NUMBER}, | |
896352d3 OO |
84 | }; |
85 | ||
d78deddc | 86 | static int columns[ARRAY_SIZE(infos) * 2] = {-1}; |
40b17508 | 87 | static size_t ncolumns; |
6dbe3af9 | 88 | |
896352d3 OO |
89 | static int get_column_id(int num) |
90 | { | |
40b17508 KZ |
91 | assert(num >= 0); |
92 | assert((size_t) num < ncolumns); | |
d78deddc | 93 | assert(columns[num] < (int) ARRAY_SIZE(infos)); |
896352d3 OO |
94 | return columns[num]; |
95 | } | |
96 | ||
97 | static struct colinfo *get_column_info(int num) | |
98 | { | |
99 | return &infos[ get_column_id(num) ]; | |
100 | } | |
101 | ||
102 | static int column_name_to_id(const char *name, size_t namesz) | |
103 | { | |
104 | size_t i; | |
105 | ||
d78deddc | 106 | for (i = 0; i < ARRAY_SIZE(infos); i++) { |
896352d3 OO |
107 | const char *cn = infos[i].name; |
108 | ||
109 | if (!strncasecmp(name, cn, namesz) && !*(cn + namesz)) | |
110 | return i; | |
111 | } | |
112 | warnx(_("unknown column: %s"), name); | |
113 | return -1; | |
114 | } | |
d03dd608 | 115 | |
39fde137 KZ |
116 | static int printf_loopdev(struct loopdev_cxt *lc) |
117 | { | |
118 | uint64_t x; | |
119 | dev_t dev = 0; | |
120 | ino_t ino = 0; | |
1b504263 | 121 | char *fname; |
a3b421df | 122 | uint32_t type; |
39fde137 KZ |
123 | |
124 | fname = loopcxt_get_backing_file(lc); | |
125 | if (!fname) | |
126 | return -EINVAL; | |
127 | ||
128 | if (loopcxt_get_backing_devno(lc, &dev) == 0) | |
129 | loopcxt_get_backing_inode(lc, &ino); | |
130 | ||
131 | if (!dev && !ino) { | |
132 | /* | |
133 | * Probably non-root user (no permissions to | |
134 | * call LOOP_GET_STATUS ioctls). | |
135 | */ | |
136 | printf("%s: []: (%s)", | |
137 | loopcxt_get_device(lc), fname); | |
138 | ||
139 | if (loopcxt_get_offset(lc, &x) == 0 && x) | |
140 | printf(_(", offset %ju"), x); | |
141 | ||
142 | if (loopcxt_get_sizelimit(lc, &x) == 0 && x) | |
143 | printf(_(", sizelimit %ju"), x); | |
9c6af25c | 144 | goto done; |
39fde137 KZ |
145 | } |
146 | ||
147 | printf("%s: [%04d]:%" PRIu64 " (%s)", | |
a3b421df | 148 | loopcxt_get_device(lc), (int) dev, ino, fname); |
39fde137 KZ |
149 | |
150 | if (loopcxt_get_offset(lc, &x) == 0 && x) | |
151 | printf(_(", offset %ju"), x); | |
152 | ||
153 | if (loopcxt_get_sizelimit(lc, &x) == 0 && x) | |
154 | printf(_(", sizelimit %ju"), x); | |
155 | ||
156 | if (loopcxt_get_encrypt_type(lc, &type) == 0) { | |
157 | const char *e = loopcxt_get_crypt_name(lc); | |
158 | ||
159 | if ((!e || !*e) && type == 1) | |
160 | e = "XOR"; | |
161 | if (e && *e) | |
a3b421df | 162 | printf(_(", encryption %s (type %u)"), e, type); |
39fde137 | 163 | } |
9c6af25c KZ |
164 | |
165 | done: | |
166 | free(fname); | |
39fde137 KZ |
167 | printf("\n"); |
168 | return 0; | |
169 | } | |
170 | ||
bc0ac075 KZ |
171 | static int show_all_loops(struct loopdev_cxt *lc, const char *file, |
172 | uint64_t offset, int flags) | |
39fde137 | 173 | { |
bc0ac075 | 174 | struct stat sbuf, *st = &sbuf; |
6d62bc0f | 175 | char *cn_file = NULL; |
bc0ac075 | 176 | |
39fde137 | 177 | if (loopcxt_init_iterator(lc, LOOPITER_FL_USED)) |
6e90a44c | 178 | return -1; |
39fde137 | 179 | |
bc0ac075 KZ |
180 | if (!file || stat(file, st)) |
181 | st = NULL; | |
182 | ||
183 | while (loopcxt_next(lc) == 0) { | |
6d62bc0f KZ |
184 | if (file) { |
185 | int used; | |
186 | const char *bf = cn_file ? cn_file : file; | |
187 | ||
74a4705a | 188 | used = loopcxt_is_used(lc, st, bf, offset, 0, flags); |
6d62bc0f KZ |
189 | if (!used && !cn_file) { |
190 | bf = cn_file = canonicalize_path(file); | |
74a4705a | 191 | used = loopcxt_is_used(lc, st, bf, offset, 0, flags); |
6d62bc0f KZ |
192 | } |
193 | if (!used) | |
114ade3d SK |
194 | continue; |
195 | } | |
bc0ac075 KZ |
196 | printf_loopdev(lc); |
197 | } | |
c654c4f0 | 198 | loopcxt_deinit_iterator(lc); |
f614b73c | 199 | free(cn_file); |
6e90a44c KZ |
200 | return 0; |
201 | } | |
202 | ||
c654c4f0 KZ |
203 | static int delete_loop(struct loopdev_cxt *lc) |
204 | { | |
205 | if (loopcxt_delete_device(lc)) | |
206 | warn(_("%s: detach failed"), loopcxt_get_device(lc)); | |
207 | else | |
208 | return 0; | |
209 | ||
210 | return -1; | |
211 | } | |
212 | ||
213 | static int delete_all_loops(struct loopdev_cxt *lc) | |
214 | { | |
215 | int res = 0; | |
216 | ||
217 | if (loopcxt_init_iterator(lc, LOOPITER_FL_USED)) | |
218 | return -1; | |
219 | ||
220 | while (loopcxt_next(lc) == 0) | |
221 | res += delete_loop(lc); | |
222 | ||
223 | loopcxt_deinit_iterator(lc); | |
224 | return res; | |
39fde137 KZ |
225 | } |
226 | ||
7e86cd54 | 227 | static int set_scols_data(struct loopdev_cxt *lc, struct libscols_line *ln) |
896352d3 | 228 | { |
40b17508 | 229 | size_t i; |
896352d3 OO |
230 | |
231 | for (i = 0; i < ncolumns; i++) { | |
48f1f38b KZ |
232 | const char *p = NULL; /* external data */ |
233 | char *np = NULL; /* allocated here */ | |
896352d3 | 234 | uint64_t x = 0; |
a9e3ec19 | 235 | int rc = 0; |
896352d3 OO |
236 | |
237 | switch(get_column_id(i)) { | |
238 | case COL_NAME: | |
239 | p = loopcxt_get_device(lc); | |
896352d3 OO |
240 | break; |
241 | case COL_BACK_FILE: | |
242 | p = loopcxt_get_backing_file(lc); | |
896352d3 OO |
243 | break; |
244 | case COL_OFFSET: | |
245 | if (loopcxt_get_offset(lc, &x) == 0) | |
246 | xasprintf(&np, "%jd", x); | |
896352d3 | 247 | break; |
4ad996d7 | 248 | case COL_SIZELIMIT: |
896352d3 OO |
249 | if (loopcxt_get_sizelimit(lc, &x) == 0) |
250 | xasprintf(&np, "%jd", x); | |
896352d3 OO |
251 | break; |
252 | case COL_BACK_MAJMIN: | |
253 | { | |
254 | dev_t dev = 0; | |
255 | if (loopcxt_get_backing_devno(lc, &dev) == 0 && dev) | |
256 | xasprintf(&np, "%8u:%-3u", major(dev), minor(dev)); | |
896352d3 OO |
257 | break; |
258 | } | |
259 | case COL_MAJMIN: | |
260 | { | |
261 | struct stat st; | |
262 | ||
263 | if (loopcxt_get_device(lc) | |
264 | && stat(loopcxt_get_device(lc), &st) == 0 | |
265 | && S_ISBLK(st.st_mode) | |
266 | && major(st.st_rdev) == LOOPDEV_MAJOR) | |
267 | xasprintf(&np, "%3u:%-3u", major(st.st_rdev), | |
268 | minor(st.st_rdev)); | |
896352d3 OO |
269 | break; |
270 | } | |
271 | case COL_BACK_INO: | |
272 | { | |
273 | ino_t ino = 0; | |
274 | if (loopcxt_get_backing_inode(lc, &ino) == 0 && ino) | |
275 | xasprintf(&np, "%ju", ino); | |
896352d3 OO |
276 | break; |
277 | } | |
278 | case COL_AUTOCLR: | |
48f1f38b | 279 | p = loopcxt_is_autoclear(lc) ? "1" : "0"; |
896352d3 OO |
280 | break; |
281 | case COL_RO: | |
48f1f38b | 282 | p = loopcxt_is_readonly(lc) ? "1" : "0"; |
896352d3 | 283 | break; |
faeef4d2 ML |
284 | case COL_DIO: |
285 | p = loopcxt_is_dio(lc) ? "1" : "0"; | |
286 | break; | |
896352d3 | 287 | case COL_PARTSCAN: |
48f1f38b | 288 | p = loopcxt_is_partscan(lc) ? "1" : "0"; |
896352d3 | 289 | break; |
76493ceb | 290 | case COL_LOGSEC: |
a1a41597 SB |
291 | if (loopcxt_get_blocksize(lc, &x) == 0) |
292 | xasprintf(&np, "%jd", x); | |
293 | break; | |
896352d3 OO |
294 | default: |
295 | return -EINVAL; | |
296 | } | |
48f1f38b KZ |
297 | |
298 | ||
299 | if (p) | |
780ce22c | 300 | rc = scols_line_set_data(ln, i, p); /* calls strdup() */ |
48f1f38b | 301 | else if (np) |
780ce22c KZ |
302 | rc = scols_line_refer_data(ln, i, np); /* only refers */ |
303 | ||
304 | if (rc) | |
305 | err(EXIT_FAILURE, _("failed to add output data")); | |
896352d3 | 306 | } |
48f1f38b | 307 | |
896352d3 OO |
308 | return 0; |
309 | } | |
310 | ||
48f1f38b | 311 | static int show_table(struct loopdev_cxt *lc, |
9f56106d KZ |
312 | const char *file, |
313 | uint64_t offset, | |
7e86cd54 | 314 | int flags) |
896352d3 OO |
315 | { |
316 | struct stat sbuf, *st = &sbuf; | |
48f1f38b | 317 | struct libscols_table *tb; |
7e86cd54 | 318 | struct libscols_line *ln; |
40b17508 KZ |
319 | int rc = 0; |
320 | size_t i; | |
896352d3 | 321 | |
710ed55d KZ |
322 | scols_init_debug(0); |
323 | ||
0925a9dd | 324 | if (!(tb = scols_new_table())) |
780ce22c | 325 | err(EXIT_FAILURE, _("failed to allocate output table")); |
0925a9dd | 326 | scols_table_enable_raw(tb, raw); |
4827093d | 327 | scols_table_enable_json(tb, json); |
0925a9dd | 328 | scols_table_enable_noheadings(tb, no_headings); |
896352d3 | 329 | |
4827093d KZ |
330 | if (json) |
331 | scols_table_set_name(tb, "loopdevices"); | |
332 | ||
e0b06769 | 333 | for (i = 0; i < ncolumns; i++) { |
896352d3 | 334 | struct colinfo *ci = get_column_info(i); |
46de0fe6 | 335 | struct libscols_column *cl; |
896352d3 | 336 | |
46de0fe6 KZ |
337 | cl = scols_table_new_column(tb, ci->name, ci->whint, ci->flags); |
338 | if (!cl) | |
780ce22c | 339 | err(EXIT_FAILURE, _("failed to allocate output column")); |
46de0fe6 KZ |
340 | if (json) |
341 | scols_column_set_json_type(cl, ci->json_type); | |
896352d3 OO |
342 | } |
343 | ||
9f56106d | 344 | /* only one loopdev requested (already assigned to loopdev_cxt) */ |
896352d3 | 345 | if (loopcxt_get_device(lc)) { |
48f1f38b | 346 | ln = scols_table_new_line(tb, NULL); |
7e86cd54 | 347 | if (!ln) |
780ce22c | 348 | err(EXIT_FAILURE, _("failed to allocate output line")); |
48f1f38b | 349 | rc = set_scols_data(lc, ln); |
896352d3 | 350 | |
9f56106d | 351 | /* list all loopdevs */ |
48f1f38b KZ |
352 | } else { |
353 | char *cn_file = NULL; | |
896352d3 | 354 | |
48f1f38b KZ |
355 | rc = loopcxt_init_iterator(lc, LOOPITER_FL_USED); |
356 | if (rc) | |
357 | goto done; | |
358 | if (!file || stat(file, st)) | |
359 | st = NULL; | |
360 | ||
361 | while (loopcxt_next(lc) == 0) { | |
362 | if (file) { | |
363 | int used; | |
364 | const char *bf = cn_file ? cn_file : file; | |
6d62bc0f | 365 | |
74a4705a | 366 | used = loopcxt_is_used(lc, st, bf, offset, 0, flags); |
48f1f38b KZ |
367 | if (!used && !cn_file) { |
368 | bf = cn_file = canonicalize_path(file); | |
74a4705a | 369 | used = loopcxt_is_used(lc, st, bf, offset, 0, flags); |
48f1f38b KZ |
370 | } |
371 | if (!used) | |
372 | continue; | |
6d62bc0f | 373 | } |
48f1f38b KZ |
374 | |
375 | ln = scols_table_new_line(tb, NULL); | |
376 | if (!ln) | |
780ce22c | 377 | err(EXIT_FAILURE, _("failed to allocate output line")); |
48f1f38b KZ |
378 | rc = set_scols_data(lc, ln); |
379 | if (rc) | |
380 | break; | |
6d62bc0f | 381 | } |
896352d3 | 382 | |
48f1f38b KZ |
383 | loopcxt_deinit_iterator(lc); |
384 | free(cn_file); | |
896352d3 | 385 | } |
48f1f38b KZ |
386 | done: |
387 | if (rc == 0) | |
388 | rc = scols_print_table(tb); | |
389 | scols_unref_table(tb); | |
390 | return rc; | |
896352d3 OO |
391 | } |
392 | ||
6e1eda6f | 393 | static void __attribute__((__noreturn__)) usage(void) |
aadb9303 | 394 | { |
6e1eda6f | 395 | FILE *out = stdout; |
e0b06769 SK |
396 | size_t i; |
397 | ||
aadb9303 KZ |
398 | fputs(USAGE_HEADER, out); |
399 | ||
400 | fprintf(out, | |
401 | _(" %1$s [options] [<loopdev>]\n" | |
402 | " %1$s [options] -f | <loopdev> <file>\n"), | |
403 | program_invocation_short_name); | |
404 | ||
451dbcfa BS |
405 | fputs(USAGE_SEPARATOR, out); |
406 | fputs(_("Set up and control loop devices.\n"), out); | |
407 | ||
ec3624aa | 408 | /* commands */ |
aadb9303 | 409 | fputs(USAGE_OPTIONS, out); |
9c47f25e | 410 | fputs(_(" -a, --all list all used devices\n"), out); |
aa06617f | 411 | fputs(_(" -d, --detach <loopdev>... detach one or more devices\n"), out); |
9c47f25e BS |
412 | fputs(_(" -D, --detach-all detach all used devices\n"), out); |
413 | fputs(_(" -f, --find find first unused device\n"), out); | |
aa06617f | 414 | fputs(_(" -c, --set-capacity <loopdev> resize the device\n"), out); |
9c47f25e | 415 | fputs(_(" -j, --associated <file> list all devices associated with <file>\n"), out); |
9a94b634 | 416 | fputs(_(" -L, --nooverlap avoid possible conflict between devices\n"), out); |
9c47f25e | 417 | |
ec3624aa | 418 | /* commands options */ |
aadb9303 | 419 | fputs(USAGE_SEPARATOR, out); |
59a4ed11 | 420 | fputs(_(" -o, --offset <num> start at offset <num> into file\n"), out); |
aa06617f | 421 | fputs(_(" --sizelimit <num> device is limited to <num> bytes of the file\n"), out); |
ec06412c | 422 | fputs(_(" -b, --sector-size <num> set the logical sector size to <num>\n"), out); |
aa06617f BS |
423 | fputs(_(" -P, --partscan create a partitioned loop device\n"), out); |
424 | fputs(_(" -r, --read-only set up a read-only loop device\n"), out); | |
f98d9641 | 425 | fputs(_(" --direct-io[=<on|off>] open backing file with O_DIRECT\n"), out); |
59a4ed11 SK |
426 | fputs(_(" --show print device name after setup (with -f)\n"), out); |
427 | fputs(_(" -v, --verbose verbose mode\n"), out); | |
aadb9303 | 428 | |
ec3624aa | 429 | /* output options */ |
9f56106d | 430 | fputs(USAGE_SEPARATOR, out); |
ec3624aa | 431 | fputs(_(" -J, --json use JSON --list output format\n"), out); |
14576644 | 432 | fputs(_(" -l, --list list info about all or specified (default)\n"), out); |
0d0d12ad | 433 | fputs(_(" -n, --noheadings don't print headings for --list output\n"), out); |
ec3624aa | 434 | fputs(_(" -O, --output <cols> specify columns to output for --list\n"), out); |
289673b1 | 435 | fputs(_(" --output-all output all columns\n"), out); |
9f56106d KZ |
436 | fputs(_(" --raw use raw --list output format\n"), out); |
437 | ||
aadb9303 | 438 | fputs(USAGE_SEPARATOR, out); |
f45f3ec3 | 439 | printf(USAGE_HELP_OPTIONS(31)); |
aadb9303 | 440 | |
c3a4cfc5 | 441 | fputs(USAGE_COLUMNS, out); |
d78deddc | 442 | for (i = 0; i < ARRAY_SIZE(infos); i++) |
896352d3 OO |
443 | fprintf(out, " %12s %s\n", infos[i].name, _(infos[i].help)); |
444 | ||
f45f3ec3 | 445 | printf(USAGE_MAN_TAIL("losetup(8)")); |
6997468e | 446 | |
6e1eda6f | 447 | exit(EXIT_SUCCESS); |
aadb9303 | 448 | } |
22853e4a | 449 | |
6daf185c | 450 | static void warn_size(const char *filename, uint64_t size, uint64_t offset, int flags) |
35545456 KZ |
451 | { |
452 | struct stat st; | |
453 | ||
454 | if (!size) { | |
b048b8af | 455 | if (stat(filename, &st) || S_ISBLK(st.st_mode)) |
35545456 KZ |
456 | return; |
457 | size = st.st_size; | |
6daf185c KZ |
458 | |
459 | if (flags & LOOPDEV_FL_OFFSET) | |
460 | size -= offset; | |
35545456 KZ |
461 | } |
462 | ||
463 | if (size < 512) | |
97b820bf BS |
464 | warnx(_("%s: Warning: file is smaller than 512 bytes; the loop device " |
465 | "may be useless or invisible for system tools."), | |
35545456 KZ |
466 | filename); |
467 | else if (size % 512) | |
97b820bf | 468 | warnx(_("%s: Warning: file does not fit into a 512-byte sector; " |
35545456 KZ |
469 | "the end of the file will be ignored."), |
470 | filename); | |
471 | } | |
472 | ||
9a94b634 KZ |
473 | static int create_loop(struct loopdev_cxt *lc, |
474 | int nooverlap, int lo_flags, int flags, | |
422f0e9f KZ |
475 | const char *file, uint64_t offset, uint64_t sizelimit, |
476 | uint64_t blocksize) | |
9a94b634 KZ |
477 | { |
478 | int hasdev = loopcxt_has_device(lc); | |
479 | int rc = 0; | |
480 | ||
d8ba61fc | 481 | /* losetup --find --noverlap file.img */ |
9a94b634 KZ |
482 | if (!hasdev && nooverlap) { |
483 | rc = loopcxt_find_overlap(lc, file, offset, sizelimit); | |
484 | switch (rc) { | |
485 | case 0: /* not found */ | |
486 | break; | |
487 | ||
488 | case 1: /* overlap */ | |
489 | loopcxt_deinit(lc); | |
490 | errx(EXIT_FAILURE, _("%s: overlapping loop device exists"), file); | |
491 | ||
492 | case 2: /* overlap -- full size and offset match (reuse) */ | |
493 | { | |
494 | uint32_t lc_encrypt_type; | |
495 | ||
496 | /* Once a loop is initialized RO, there is no | |
497 | * way to change its parameters. */ | |
498 | if (loopcxt_is_readonly(lc) | |
499 | && !(lo_flags & LO_FLAGS_READ_ONLY)) { | |
500 | loopcxt_deinit(lc); | |
501 | errx(EXIT_FAILURE, _("%s: overlapping read-only loop device exists"), file); | |
502 | } | |
503 | ||
504 | /* This is no more supported, but check to be safe. */ | |
505 | if (loopcxt_get_encrypt_type(lc, &lc_encrypt_type) == 0 | |
506 | && lc_encrypt_type != LO_CRYPT_NONE) { | |
507 | loopcxt_deinit(lc); | |
508 | errx(EXIT_FAILURE, _("%s: overlapping encrypted loop device exists"), file); | |
509 | } | |
f27d989c | 510 | |
e9aa2a14 | 511 | lc->info.lo_flags &= ~LO_FLAGS_AUTOCLEAR; |
9fcc8936 | 512 | if (loopcxt_ioctl_status(lc)) { |
f27d989c SB |
513 | loopcxt_deinit(lc); |
514 | errx(EXIT_FAILURE, _("%s: failed to re-use loop device"), file); | |
515 | } | |
9a94b634 KZ |
516 | return 0; /* success, re-use */ |
517 | } | |
518 | default: /* error */ | |
519 | loopcxt_deinit(lc); | |
520 | errx(EXIT_FAILURE, _("failed to inspect loop devices")); | |
521 | return -errno; | |
522 | } | |
523 | } | |
524 | ||
525 | if (hasdev && !is_loopdev(loopcxt_get_device(lc))) | |
526 | loopcxt_add_device(lc); | |
527 | ||
d8ba61fc KZ |
528 | /* losetup --noverlap /dev/loopN file.img */ |
529 | if (hasdev && nooverlap) { | |
530 | struct loopdev_cxt lc2; | |
531 | ||
532 | if (loopcxt_init(&lc2, 0)) { | |
533 | loopcxt_deinit(lc); | |
534 | err(EXIT_FAILURE, _("failed to initialize loopcxt")); | |
535 | } | |
536 | rc = loopcxt_find_overlap(&lc2, file, offset, sizelimit); | |
537 | loopcxt_deinit(&lc2); | |
538 | ||
539 | if (rc) { | |
540 | loopcxt_deinit(lc); | |
541 | if (rc > 0) | |
542 | errx(EXIT_FAILURE, _("%s: overlapping loop device exists"), file); | |
543 | err(EXIT_FAILURE, _("%s: failed to check for conflicting loop devices"), file); | |
544 | } | |
545 | } | |
546 | ||
9a94b634 KZ |
547 | /* Create a new device */ |
548 | do { | |
549 | const char *errpre; | |
550 | ||
551 | /* Note that loopcxt_{find_unused,set_device}() resets | |
552 | * loopcxt struct. | |
553 | */ | |
554 | if (!hasdev && (rc = loopcxt_find_unused(lc))) { | |
555 | warnx(_("cannot find an unused loop device")); | |
556 | break; | |
557 | } | |
558 | if (flags & LOOPDEV_FL_OFFSET) | |
559 | loopcxt_set_offset(lc, offset); | |
560 | if (flags & LOOPDEV_FL_SIZELIMIT) | |
561 | loopcxt_set_sizelimit(lc, sizelimit); | |
562 | if (lo_flags) | |
563 | loopcxt_set_flags(lc, lo_flags); | |
422f0e9f KZ |
564 | if (blocksize > 0) |
565 | loopcxt_set_blocksize(lc, blocksize); | |
566 | ||
9a94b634 KZ |
567 | if ((rc = loopcxt_set_backing_file(lc, file))) { |
568 | warn(_("%s: failed to use backing file"), file); | |
569 | break; | |
570 | } | |
571 | errno = 0; | |
572 | rc = loopcxt_setup_device(lc); | |
573 | if (rc == 0) | |
574 | break; /* success */ | |
575 | if (errno == EBUSY && !hasdev) | |
576 | continue; | |
577 | ||
578 | /* errors */ | |
579 | errpre = hasdev && loopcxt_get_fd(lc) < 0 ? | |
580 | loopcxt_get_device(lc) : file; | |
581 | warn(_("%s: failed to set up loop device"), errpre); | |
582 | break; | |
583 | } while (hasdev == 0); | |
584 | ||
585 | return rc; | |
586 | } | |
587 | ||
39fde137 KZ |
588 | int main(int argc, char **argv) |
589 | { | |
590 | struct loopdev_cxt lc; | |
9a94b634 | 591 | int act = 0, flags = 0, no_overlap = 0, c; |
5cf05c71 | 592 | char *file = NULL; |
a1a41597 | 593 | uint64_t offset = 0, sizelimit = 0, blocksize = 0; |
7e86cd54 | 594 | int res = 0, showdev = 0, lo_flags = 0; |
896352d3 OO |
595 | char *outarg = NULL; |
596 | int list = 0; | |
a1a41597 | 597 | unsigned long use_dio = 0, set_dio = 0, set_blocksize = 0; |
6c7d5ae9 | 598 | |
aadb9303 KZ |
599 | enum { |
600 | OPT_SIZELIMIT = CHAR_MAX + 1, | |
9f56106d | 601 | OPT_SHOW, |
64c3bb3c | 602 | OPT_RAW, |
289673b1 SK |
603 | OPT_DIO, |
604 | OPT_OUTPUT_ALL | |
aadb9303 KZ |
605 | }; |
606 | static const struct option longopts[] = { | |
87918040 SK |
607 | { "all", no_argument, NULL, 'a' }, |
608 | { "set-capacity", required_argument, NULL, 'c' }, | |
609 | { "detach", required_argument, NULL, 'd' }, | |
610 | { "detach-all", no_argument, NULL, 'D' }, | |
611 | { "find", no_argument, NULL, 'f' }, | |
612 | { "nooverlap", no_argument, NULL, 'L' }, | |
613 | { "help", no_argument, NULL, 'h' }, | |
614 | { "associated", required_argument, NULL, 'j' }, | |
615 | { "json", no_argument, NULL, 'J' }, | |
616 | { "list", no_argument, NULL, 'l' }, | |
76493ceb | 617 | { "sector-size", required_argument, NULL, 'b' }, |
87918040 SK |
618 | { "noheadings", no_argument, NULL, 'n' }, |
619 | { "offset", required_argument, NULL, 'o' }, | |
620 | { "output", required_argument, NULL, 'O' }, | |
289673b1 | 621 | { "output-all", no_argument, NULL, OPT_OUTPUT_ALL }, |
87918040 SK |
622 | { "sizelimit", required_argument, NULL, OPT_SIZELIMIT }, |
623 | { "partscan", no_argument, NULL, 'P' }, | |
624 | { "read-only", no_argument, NULL, 'r' }, | |
625 | { "direct-io", optional_argument, NULL, OPT_DIO }, | |
626 | { "raw", no_argument, NULL, OPT_RAW }, | |
627 | { "show", no_argument, NULL, OPT_SHOW }, | |
628 | { "verbose", no_argument, NULL, 'v' }, | |
629 | { "version", no_argument, NULL, 'V' }, | |
630 | { NULL, 0, NULL, 0 } | |
d99f0140 | 631 | }; |
22853e4a | 632 | |
c1ac3144 KZ |
633 | static const ul_excl_t excl[] = { /* rows and cols in ASCII order */ |
634 | { 'D','a','c','d','f','j' }, | |
896352d3 | 635 | { 'D','c','d','f','l' }, |
65178cb3 | 636 | { 'D','c','d','f','O' }, |
4827093d | 637 | { 'J',OPT_RAW }, |
c1ac3144 KZ |
638 | { 0 } |
639 | }; | |
640 | int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT; | |
641 | ||
22853e4a KZ |
642 | setlocale(LC_ALL, ""); |
643 | bindtextdomain(PACKAGE, LOCALEDIR); | |
644 | textdomain(PACKAGE); | |
25b7045e | 645 | close_stdout_atexit(); |
22853e4a | 646 | |
defa0710 KZ |
647 | if (loopcxt_init(&lc, 0)) |
648 | err(EXIT_FAILURE, _("failed to initialize loopcxt")); | |
649 | ||
a1a41597 | 650 | while ((c = getopt_long(argc, argv, "ab:c:d:Dfhj:JlLno:O:PrvV", |
d99f0140 | 651 | longopts, NULL)) != -1) { |
c1ac3144 KZ |
652 | |
653 | err_exclusive_options(c, longopts, excl, excl_st); | |
654 | ||
22853e4a | 655 | switch (c) { |
8b125fae | 656 | case 'a': |
39fde137 | 657 | act = A_SHOW; |
8b125fae | 658 | break; |
a1a41597 SB |
659 | case 'b': |
660 | set_blocksize = 1; | |
661 | blocksize = strtosize_or_err(optarg, _("failed to parse logical block size")); | |
662 | break; | |
d34ac93a | 663 | case 'c': |
6e90a44c | 664 | act = A_SET_CAPACITY; |
21ce3f3a KZ |
665 | if (!is_loopdev(optarg) || |
666 | loopcxt_set_device(&lc, optarg)) | |
defa0710 KZ |
667 | err(EXIT_FAILURE, _("%s: failed to use device"), |
668 | optarg); | |
d34ac93a | 669 | break; |
faf142b6 | 670 | case 'r': |
c7e0925d | 671 | lo_flags |= LO_FLAGS_READ_ONLY; |
faf142b6 | 672 | break; |
22853e4a | 673 | case 'd': |
c654c4f0 | 674 | act = A_DELETE; |
21ce3f3a KZ |
675 | if (!is_loopdev(optarg) || |
676 | loopcxt_set_device(&lc, optarg)) | |
defa0710 KZ |
677 | err(EXIT_FAILURE, _("%s: failed to use device"), |
678 | optarg); | |
22853e4a | 679 | break; |
34f9b684 | 680 | case 'D': |
c654c4f0 | 681 | act = A_DELETE_ALL; |
34f9b684 | 682 | break; |
d162fcb5 | 683 | case 'f': |
bcdbdc72 | 684 | act = A_FIND_FREE; |
d162fcb5 | 685 | break; |
4827093d KZ |
686 | case 'J': |
687 | json = 1; | |
688 | break; | |
259fcc57 | 689 | case 'j': |
bc0ac075 KZ |
690 | act = A_SHOW; |
691 | file = optarg; | |
259fcc57 | 692 | break; |
896352d3 OO |
693 | case 'l': |
694 | list = 1; | |
695 | break; | |
9a94b634 KZ |
696 | case 'L': |
697 | no_overlap = 1; | |
698 | break; | |
9f56106d | 699 | case 'n': |
7e86cd54 | 700 | no_headings = 1; |
9f56106d KZ |
701 | break; |
702 | case OPT_RAW: | |
7e86cd54 | 703 | raw = 1; |
9f56106d | 704 | break; |
22853e4a | 705 | case 'o': |
e9e426eb | 706 | offset = strtosize_or_err(optarg, _("failed to parse offset")); |
bc0ac075 | 707 | flags |= LOOPDEV_FL_OFFSET; |
22853e4a | 708 | break; |
896352d3 OO |
709 | case 'O': |
710 | outarg = optarg; | |
65178cb3 | 711 | list = 1; |
896352d3 | 712 | break; |
289673b1 SK |
713 | case OPT_OUTPUT_ALL: |
714 | for (ncolumns = 0; ncolumns < ARRAY_SIZE(infos); ncolumns++) | |
715 | columns[ncolumns] = ncolumns; | |
716 | break; | |
916bf85e KZ |
717 | case 'P': |
718 | lo_flags |= LO_FLAGS_PARTSCAN; | |
719 | break; | |
aadb9303 | 720 | case OPT_SHOW: |
ba3809b0 KZ |
721 | showdev = 1; |
722 | break; | |
64c3bb3c | 723 | case OPT_DIO: |
f98d9641 KZ |
724 | use_dio = set_dio = 1; |
725 | if (optarg) | |
726 | use_dio = parse_switch(optarg, _("argument error"), "on", "off", NULL); | |
64c3bb3c | 727 | break; |
22853e4a | 728 | case 'v': |
22853e4a | 729 | break; |
aadb9303 | 730 | case OPT_SIZELIMIT: /* --sizelimit */ |
e9e426eb | 731 | sizelimit = strtosize_or_err(optarg, _("failed to parse size")); |
c7e0925d | 732 | flags |= LOOPDEV_FL_SIZELIMIT; |
7bcefc7f | 733 | break; |
2c308875 KZ |
734 | |
735 | case 'h': | |
736 | usage(); | |
737 | case 'V': | |
738 | print_version(EXIT_SUCCESS); | |
22853e4a | 739 | default: |
677ec86c | 740 | errtryhelp(EXIT_FAILURE); |
22853e4a KZ |
741 | } |
742 | } | |
d162fcb5 | 743 | |
bcf445fd KZ |
744 | ul_path_init_debug(); |
745 | ul_sysfs_init_debug(); | |
746 | ||
896352d3 OO |
747 | /* default is --list --all */ |
748 | if (argc == 1) { | |
749 | act = A_SHOW; | |
750 | list = 1; | |
751 | } | |
752 | ||
4827093d KZ |
753 | if (!act && argc == 2 && (raw || json)) { |
754 | act = A_SHOW; | |
755 | list = 1; | |
756 | } | |
757 | ||
896352d3 OO |
758 | /* default --list output columns */ |
759 | if (list && !ncolumns) { | |
760 | columns[ncolumns++] = COL_NAME; | |
4ad996d7 | 761 | columns[ncolumns++] = COL_SIZELIMIT; |
896352d3 OO |
762 | columns[ncolumns++] = COL_OFFSET; |
763 | columns[ncolumns++] = COL_AUTOCLR; | |
764 | columns[ncolumns++] = COL_RO; | |
765 | columns[ncolumns++] = COL_BACK_FILE; | |
faeef4d2 | 766 | columns[ncolumns++] = COL_DIO; |
76493ceb | 767 | columns[ncolumns++] = COL_LOGSEC; |
896352d3 | 768 | } |
39fde137 | 769 | |
c7e0925d KZ |
770 | if (act == A_FIND_FREE && optind < argc) { |
771 | /* | |
772 | * losetup -f <backing_file> | |
773 | */ | |
774 | act = A_CREATE; | |
775 | file = argv[optind++]; | |
c3f5a0f1 KZ |
776 | |
777 | if (optind < argc) | |
778 | errx(EXIT_FAILURE, _("unexpected arguments")); | |
c7e0925d | 779 | } |
896352d3 OO |
780 | |
781 | if (list && !act && optind == argc) | |
782 | /* | |
783 | * losetup --list defaults to --all | |
784 | */ | |
785 | act = A_SHOW; | |
786 | ||
09ec0c0a KZ |
787 | if (!act && optind + 1 == argc) { |
788 | /* | |
896352d3 | 789 | * losetup [--list] <device> |
64c3bb3c | 790 | * OR |
a1a41597 | 791 | * losetup {--direct-io[=off]|--logical-blocksize=size}... <device> |
09ec0c0a | 792 | */ |
a1a41597 | 793 | if (!(set_dio || set_blocksize)) |
64c3bb3c | 794 | act = A_SHOW_ONE; |
a1a41597 | 795 | if (set_dio) |
64c3bb3c | 796 | act = A_SET_DIRECT_IO; |
a1a41597 SB |
797 | if (set_blocksize) |
798 | act = A_SET_BLOCKSIZE; | |
21ce3f3a KZ |
799 | if (!is_loopdev(argv[optind]) || |
800 | loopcxt_set_device(&lc, argv[optind])) | |
defa0710 KZ |
801 | err(EXIT_FAILURE, _("%s: failed to use device"), |
802 | argv[optind]); | |
803 | optind++; | |
09ec0c0a | 804 | } |
c7e0925d KZ |
805 | if (!act) { |
806 | /* | |
807 | * losetup <loopdev> <backing_file> | |
808 | */ | |
809 | act = A_CREATE; | |
810 | ||
811 | if (optind >= argc) | |
812 | errx(EXIT_FAILURE, _("no loop device specified")); | |
21ce3f3a | 813 | /* don't use is_loopdev() here, the device does not have exist yet */ |
defa0710 | 814 | if (loopcxt_set_device(&lc, argv[optind])) |
e9e7698e | 815 | err(EXIT_FAILURE, _("%s: failed to use device"), |
defa0710 KZ |
816 | argv[optind]); |
817 | optind++; | |
c7e0925d KZ |
818 | |
819 | if (optind >= argc) | |
820 | errx(EXIT_FAILURE, _("no file specified")); | |
821 | file = argv[optind++]; | |
822 | } | |
823 | ||
824 | if (act != A_CREATE && | |
5cf05c71 | 825 | (sizelimit || lo_flags || showdev)) |
c7e0925d | 826 | errx(EXIT_FAILURE, |
136b23ef | 827 | _("the options %s are allowed during loop device setup only"), |
014e7eb3 | 828 | "--{sizelimit,partscan,read-only,show}"); |
c7e0925d | 829 | |
934df30d KZ |
830 | if ((flags & LOOPDEV_FL_OFFSET) && |
831 | act != A_CREATE && (act != A_SHOW || !file)) | |
136b23ef | 832 | errx(EXIT_FAILURE, _("the option --offset is not allowed in this context")); |
c654c4f0 | 833 | |
896352d3 OO |
834 | if (outarg && string_add_to_idarray(outarg, columns, ARRAY_SIZE(columns), |
835 | &ncolumns, column_name_to_id) < 0) | |
836 | return EXIT_FAILURE; | |
837 | ||
39fde137 | 838 | switch (act) { |
c7e0925d | 839 | case A_CREATE: |
422f0e9f KZ |
840 | res = create_loop(&lc, no_overlap, lo_flags, flags, file, |
841 | offset, sizelimit, blocksize); | |
35545456 KZ |
842 | if (res == 0) { |
843 | if (showdev) | |
844 | printf("%s\n", loopcxt_get_device(&lc)); | |
6daf185c | 845 | warn_size(file, sizelimit, offset, flags); |
422f0e9f KZ |
846 | if (set_dio) |
847 | goto lo_set_dio; | |
35545456 | 848 | } |
c7e0925d | 849 | break; |
c654c4f0 KZ |
850 | case A_DELETE: |
851 | res = delete_loop(&lc); | |
852 | while (optind < argc) { | |
21ce3f3a KZ |
853 | if (!is_loopdev(argv[optind]) || |
854 | loopcxt_set_device(&lc, argv[optind])) | |
defa0710 KZ |
855 | warn(_("%s: failed to use device"), |
856 | argv[optind]); | |
857 | optind++; | |
c654c4f0 KZ |
858 | res += delete_loop(&lc); |
859 | } | |
860 | break; | |
861 | case A_DELETE_ALL: | |
862 | res = delete_all_loops(&lc); | |
863 | break; | |
bcdbdc72 | 864 | case A_FIND_FREE: |
3e55659f | 865 | res = loopcxt_find_unused(&lc); |
362f5d20 KZ |
866 | if (res) { |
867 | int errsv = errno; | |
868 | ||
869 | if (access(_PATH_DEV_LOOPCTL, F_OK) == 0 && | |
870 | access(_PATH_DEV_LOOPCTL, W_OK) != 0) | |
871 | ; | |
872 | else | |
873 | errno = errsv; | |
874 | ||
136b23ef | 875 | warn(_("cannot find an unused loop device")); |
362f5d20 | 876 | } else |
bcdbdc72 KZ |
877 | printf("%s\n", loopcxt_get_device(&lc)); |
878 | break; | |
39fde137 | 879 | case A_SHOW: |
896352d3 | 880 | if (list) |
48f1f38b | 881 | res = show_table(&lc, file, offset, flags); |
896352d3 OO |
882 | else |
883 | res = show_all_loops(&lc, file, offset, flags); | |
bc0ac075 | 884 | break; |
09ec0c0a | 885 | case A_SHOW_ONE: |
896352d3 | 886 | if (list) |
48f1f38b | 887 | res = show_table(&lc, NULL, 0, 0); |
896352d3 OO |
888 | else |
889 | res = printf_loopdev(&lc); | |
09ec0c0a | 890 | if (res) |
136b23ef | 891 | warn("%s", loopcxt_get_device(&lc)); |
09ec0c0a | 892 | break; |
6e90a44c | 893 | case A_SET_CAPACITY: |
9fcc8936 | 894 | res = loopcxt_ioctl_capacity(&lc); |
293714c0 JM |
895 | if (res) |
896 | warn(_("%s: set capacity failed"), | |
897 | loopcxt_get_device(&lc)); | |
6e90a44c | 898 | break; |
64c3bb3c | 899 | case A_SET_DIRECT_IO: |
422f0e9f KZ |
900 | lo_set_dio: |
901 | res = loopcxt_ioctl_dio(&lc, use_dio); | |
902 | if (res) | |
903 | warn(_("%s: set direct io failed"), | |
904 | loopcxt_get_device(&lc)); | |
905 | break; | |
a1a41597 | 906 | case A_SET_BLOCKSIZE: |
422f0e9f KZ |
907 | res = loopcxt_ioctl_blocksize(&lc, blocksize); |
908 | if (res) | |
909 | warn(_("%s: set logical block size failed"), | |
910 | loopcxt_get_device(&lc)); | |
64c3bb3c | 911 | break; |
39fde137 | 912 | default: |
6e1eda6f RM |
913 | warnx(_("bad usage")); |
914 | errtryhelp(EXIT_FAILURE); | |
39fde137 KZ |
915 | break; |
916 | } | |
917 | ||
918 | loopcxt_deinit(&lc); | |
c7e0925d | 919 | return res ? EXIT_FAILURE : EXIT_SUCCESS; |
22853e4a KZ |
920 | } |
921 |