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b6e676ce LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2015 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <linux/fs.h> | |
23 | ||
24 | #include "sd-daemon.h" | |
25 | #include "sd-event.h" | |
26 | #include "util.h" | |
27 | #include "path-util.h" | |
28 | #include "btrfs-util.h" | |
29 | #include "copy.h" | |
30 | #include "mkdir.h" | |
c6878637 | 31 | #include "rm-rf.h" |
b6e676ce LP |
32 | #include "ratelimit.h" |
33 | #include "machine-pool.h" | |
34 | #include "qcow2-util.h" | |
35 | #include "import-compress.h" | |
36 | #include "import-common.h" | |
37 | #include "import-raw.h" | |
38 | ||
39 | struct RawImport { | |
40 | sd_event *event; | |
41 | ||
42 | char *image_root; | |
43 | ||
44 | RawImportFinished on_finished; | |
45 | void *userdata; | |
46 | ||
47 | char *local; | |
48 | bool force_local; | |
49 | bool read_only; | |
50 | bool grow_machine_directory; | |
51 | ||
52 | char *temp_path; | |
53 | char *final_path; | |
54 | ||
55 | int input_fd; | |
56 | int output_fd; | |
57 | ||
58 | ImportCompress compress; | |
59 | ||
60 | uint64_t written_since_last_grow; | |
61 | ||
62 | sd_event_source *input_event_source; | |
63 | ||
64 | uint8_t buffer[16*1024]; | |
65 | size_t buffer_size; | |
66 | ||
67 | uint64_t written_compressed; | |
68 | uint64_t written_uncompressed; | |
69 | ||
70 | struct stat st; | |
71 | ||
72 | unsigned last_percent; | |
73 | RateLimit progress_rate_limit; | |
74 | }; | |
75 | ||
76 | RawImport* raw_import_unref(RawImport *i) { | |
77 | if (!i) | |
78 | return NULL; | |
79 | ||
80 | sd_event_unref(i->event); | |
81 | ||
82 | if (i->temp_path) { | |
83 | (void) unlink(i->temp_path); | |
84 | free(i->temp_path); | |
85 | } | |
86 | ||
87 | import_compress_free(&i->compress); | |
88 | ||
89 | sd_event_source_unref(i->input_event_source); | |
90 | ||
91 | safe_close(i->output_fd); | |
92 | ||
93 | free(i->final_path); | |
94 | free(i->image_root); | |
95 | free(i->local); | |
96 | free(i); | |
97 | ||
98 | return NULL; | |
99 | } | |
100 | ||
101 | int raw_import_new( | |
102 | RawImport **ret, | |
103 | sd_event *event, | |
104 | const char *image_root, | |
105 | RawImportFinished on_finished, | |
106 | void *userdata) { | |
107 | ||
108 | _cleanup_(raw_import_unrefp) RawImport *i = NULL; | |
109 | int r; | |
110 | ||
111 | assert(ret); | |
112 | ||
113 | i = new0(RawImport, 1); | |
114 | if (!i) | |
115 | return -ENOMEM; | |
116 | ||
117 | i->input_fd = i->output_fd = -1; | |
118 | i->on_finished = on_finished; | |
119 | i->userdata = userdata; | |
120 | ||
587fec42 | 121 | RATELIMIT_INIT(i->progress_rate_limit, 100 * USEC_PER_MSEC, 1); |
b6e676ce LP |
122 | i->last_percent = (unsigned) -1; |
123 | ||
124 | i->image_root = strdup(image_root ?: "/var/lib/machines"); | |
125 | if (!i->image_root) | |
126 | return -ENOMEM; | |
127 | ||
128 | i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines"); | |
129 | ||
130 | if (event) | |
131 | i->event = sd_event_ref(event); | |
132 | else { | |
133 | r = sd_event_default(&i->event); | |
134 | if (r < 0) | |
135 | return r; | |
136 | } | |
137 | ||
138 | *ret = i; | |
139 | i = NULL; | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static void raw_import_report_progress(RawImport *i) { | |
145 | unsigned percent; | |
146 | assert(i); | |
147 | ||
148 | /* We have no size information, unless the source is a regular file */ | |
149 | if (!S_ISREG(i->st.st_mode)) | |
150 | return; | |
151 | ||
152 | if (i->written_compressed >= (uint64_t) i->st.st_size) | |
153 | percent = 100; | |
154 | else | |
155 | percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size); | |
156 | ||
157 | if (percent == i->last_percent) | |
158 | return; | |
159 | ||
160 | if (!ratelimit_test(&i->progress_rate_limit)) | |
161 | return; | |
162 | ||
163 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
164 | log_info("Imported %u%%.", percent); | |
165 | ||
166 | i->last_percent = percent; | |
167 | } | |
168 | ||
169 | static int raw_import_maybe_convert_qcow2(RawImport *i) { | |
170 | _cleanup_close_ int converted_fd = -1; | |
171 | _cleanup_free_ char *t = NULL; | |
172 | int r; | |
173 | ||
174 | assert(i); | |
175 | ||
176 | r = qcow2_detect(i->output_fd); | |
177 | if (r < 0) | |
178 | return log_error_errno(r, "Failed to detect whether this is a QCOW2 image: %m"); | |
179 | if (r == 0) | |
180 | return 0; | |
181 | ||
182 | /* This is a QCOW2 image, let's convert it */ | |
183 | r = tempfn_random(i->final_path, &t); | |
184 | if (r < 0) | |
185 | return log_oom(); | |
186 | ||
187 | converted_fd = open(t, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664); | |
188 | if (converted_fd < 0) | |
189 | return log_error_errno(errno, "Failed to create %s: %m", t); | |
190 | ||
1ed8f8c1 | 191 | r = chattr_fd(converted_fd, FS_NOCOW_FL, FS_NOCOW_FL); |
b6e676ce LP |
192 | if (r < 0) |
193 | log_warning_errno(errno, "Failed to set file attributes on %s: %m", t); | |
194 | ||
195 | log_info("Unpacking QCOW2 file."); | |
196 | ||
197 | r = qcow2_convert(i->output_fd, converted_fd); | |
198 | if (r < 0) { | |
199 | unlink(t); | |
200 | return log_error_errno(r, "Failed to convert qcow2 image: %m"); | |
201 | } | |
202 | ||
203 | (void) unlink(i->temp_path); | |
204 | free(i->temp_path); | |
205 | i->temp_path = t; | |
206 | t = NULL; | |
207 | ||
208 | safe_close(i->output_fd); | |
209 | i->output_fd = converted_fd; | |
210 | converted_fd = -1; | |
211 | ||
212 | return 1; | |
213 | } | |
214 | ||
215 | static int raw_import_finish(RawImport *i) { | |
216 | int r; | |
217 | ||
218 | assert(i); | |
219 | assert(i->output_fd >= 0); | |
220 | assert(i->temp_path); | |
221 | assert(i->final_path); | |
222 | ||
223 | /* In case this was a sparse file, make sure the file system is right */ | |
224 | if (i->written_uncompressed > 0) { | |
225 | if (ftruncate(i->output_fd, i->written_uncompressed) < 0) | |
226 | return log_error_errno(errno, "Failed to truncate file: %m"); | |
227 | } | |
228 | ||
229 | r = raw_import_maybe_convert_qcow2(i); | |
230 | if (r < 0) | |
231 | return r; | |
232 | ||
233 | if (S_ISREG(i->st.st_mode)) { | |
234 | (void) copy_times(i->input_fd, i->output_fd); | |
235 | (void) copy_xattr(i->input_fd, i->output_fd); | |
236 | } | |
237 | ||
238 | if (i->read_only) { | |
239 | r = import_make_read_only_fd(i->output_fd); | |
240 | if (r < 0) | |
241 | return r; | |
242 | } | |
243 | ||
d9e2daaf LP |
244 | if (i->force_local) |
245 | (void) rm_rf(i->final_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); | |
b6e676ce | 246 | |
f85ef957 AC |
247 | r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path); |
248 | if (r < 0) | |
249 | return log_error_errno(r, "Failed to move image into place: %m"); | |
b6e676ce LP |
250 | |
251 | free(i->temp_path); | |
252 | i->temp_path = NULL; | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static int raw_import_open_disk(RawImport *i) { | |
258 | int r; | |
259 | ||
260 | assert(i); | |
261 | ||
262 | assert(!i->final_path); | |
263 | assert(!i->temp_path); | |
264 | assert(i->output_fd < 0); | |
265 | ||
266 | i->final_path = strjoin(i->image_root, "/", i->local, ".raw", NULL); | |
267 | if (!i->final_path) | |
268 | return log_oom(); | |
269 | ||
270 | r = tempfn_random(i->final_path, &i->temp_path); | |
271 | if (r < 0) | |
272 | return log_oom(); | |
273 | ||
274 | (void) mkdir_parents_label(i->temp_path, 0700); | |
275 | ||
276 | i->output_fd = open(i->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664); | |
277 | if (i->output_fd < 0) | |
278 | return log_error_errno(errno, "Failed to open destination %s: %m", i->temp_path); | |
279 | ||
1ed8f8c1 | 280 | r = chattr_fd(i->output_fd, FS_NOCOW_FL, FS_NOCOW_FL); |
b6e676ce LP |
281 | if (r < 0) |
282 | log_warning_errno(errno, "Failed to set file attributes on %s: %m", i->temp_path); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static int raw_import_try_reflink(RawImport *i) { | |
288 | off_t p; | |
289 | int r; | |
290 | ||
291 | assert(i); | |
292 | assert(i->input_fd >= 0); | |
293 | assert(i->output_fd >= 0); | |
294 | ||
295 | if (i->compress.type != IMPORT_COMPRESS_UNCOMPRESSED) | |
296 | return 0; | |
297 | ||
298 | if (!S_ISREG(i->st.st_mode)) | |
299 | return 0; | |
300 | ||
301 | p = lseek(i->input_fd, 0, SEEK_CUR); | |
302 | if (p == (off_t) -1) | |
303 | return log_error_errno(errno, "Failed to read file offset of input file: %m"); | |
304 | ||
305 | /* Let's only try a btrfs reflink, if we are reading from the beginning of the file */ | |
306 | if ((uint64_t) p != (uint64_t) i->buffer_size) | |
307 | return 0; | |
308 | ||
309 | r = btrfs_reflink(i->input_fd, i->output_fd); | |
310 | if (r >= 0) | |
311 | return 1; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static int raw_import_write(const void *p, size_t sz, void *userdata) { | |
317 | RawImport *i = userdata; | |
318 | ssize_t n; | |
319 | ||
320 | if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) { | |
321 | i->written_since_last_grow = 0; | |
322 | grow_machine_directory(); | |
323 | } | |
324 | ||
325 | n = sparse_write(i->output_fd, p, sz, 64); | |
326 | if (n < 0) | |
327 | return -errno; | |
328 | if ((size_t) n < sz) | |
329 | return -EIO; | |
330 | ||
331 | i->written_uncompressed += sz; | |
332 | i->written_since_last_grow += sz; | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static int raw_import_process(RawImport *i) { | |
338 | ssize_t l; | |
339 | int r; | |
340 | ||
341 | assert(i); | |
342 | assert(i->buffer_size < sizeof(i->buffer)); | |
343 | ||
344 | l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size); | |
345 | if (l < 0) { | |
587fec42 LP |
346 | if (errno == EAGAIN) |
347 | return 0; | |
348 | ||
b6e676ce LP |
349 | r = log_error_errno(errno, "Failed to read input file: %m"); |
350 | goto finish; | |
351 | } | |
352 | if (l == 0) { | |
353 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
354 | log_error("Premature end of file: %m"); | |
355 | r = -EIO; | |
356 | goto finish; | |
357 | } | |
358 | ||
359 | r = raw_import_finish(i); | |
360 | goto finish; | |
361 | } | |
362 | ||
363 | i->buffer_size += l; | |
364 | ||
365 | if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { | |
366 | r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size); | |
367 | if (r < 0) { | |
368 | log_error("Failed to detect file compression: %m"); | |
369 | goto finish; | |
370 | } | |
371 | if (r == 0) /* Need more data */ | |
372 | return 0; | |
373 | ||
374 | r = raw_import_open_disk(i); | |
375 | if (r < 0) | |
376 | goto finish; | |
377 | ||
378 | r = raw_import_try_reflink(i); | |
379 | if (r < 0) | |
380 | goto finish; | |
381 | if (r > 0) { | |
382 | r = raw_import_finish(i); | |
383 | goto finish; | |
384 | } | |
385 | } | |
386 | ||
387 | r = import_uncompress(&i->compress, i->buffer, i->buffer_size, raw_import_write, i); | |
388 | if (r < 0) { | |
389 | log_error_errno(r, "Failed to decode and write: %m"); | |
390 | goto finish; | |
391 | } | |
392 | ||
393 | i->written_compressed += i->buffer_size; | |
394 | i->buffer_size = 0; | |
395 | ||
396 | raw_import_report_progress(i); | |
397 | ||
398 | return 0; | |
399 | ||
400 | finish: | |
401 | if (i->on_finished) | |
402 | i->on_finished(i, r, i->userdata); | |
403 | else | |
404 | sd_event_exit(i->event, r); | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | static int raw_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
410 | RawImport *i = userdata; | |
411 | ||
412 | return raw_import_process(i); | |
413 | } | |
414 | ||
415 | static int raw_import_on_defer(sd_event_source *s, void *userdata) { | |
416 | RawImport *i = userdata; | |
417 | ||
418 | return raw_import_process(i); | |
419 | } | |
420 | ||
421 | int raw_import_start(RawImport *i, int fd, const char *local, bool force_local, bool read_only) { | |
422 | int r; | |
423 | ||
424 | assert(i); | |
425 | assert(fd >= 0); | |
426 | assert(local); | |
427 | ||
428 | if (!machine_name_is_valid(local)) | |
429 | return -EINVAL; | |
430 | ||
431 | if (i->input_fd >= 0) | |
432 | return -EBUSY; | |
433 | ||
587fec42 LP |
434 | r = fd_nonblock(fd, true); |
435 | if (r < 0) | |
436 | return r; | |
437 | ||
b6e676ce LP |
438 | r = free_and_strdup(&i->local, local); |
439 | if (r < 0) | |
440 | return r; | |
441 | i->force_local = force_local; | |
442 | i->read_only = read_only; | |
443 | ||
444 | if (fstat(fd, &i->st) < 0) | |
445 | return -errno; | |
446 | ||
447 | r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, raw_import_on_input, i); | |
448 | if (r == -EPERM) { | |
449 | /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */ | |
450 | r = sd_event_add_defer(i->event, &i->input_event_source, raw_import_on_defer, i); | |
451 | if (r < 0) | |
452 | return r; | |
453 | ||
454 | r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON); | |
455 | } | |
456 | if (r < 0) | |
457 | return r; | |
458 | ||
459 | i->input_fd = fd; | |
460 | return r; | |
461 | } |