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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
587fec42 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2015 Lennart Poettering | |
587fec42 LP |
6 | ***/ |
7 | ||
8 | #include <sys/sendfile.h> | |
cf0fbc49 TA |
9 | |
10 | /* When we include libgen.h because we need dirname() we immediately | |
11 | * undefine basename() since libgen.h defines it as a macro to the POSIX | |
12 | * version which is really broken. We prefer GNU basename(). */ | |
587fec42 LP |
13 | #include <libgen.h> |
14 | #undef basename | |
15 | ||
16 | #include "sd-daemon.h" | |
07630cea | 17 | |
b5efdb8a | 18 | #include "alloc-util.h" |
587fec42 LP |
19 | #include "btrfs-util.h" |
20 | #include "copy.h" | |
587fec42 | 21 | #include "export-raw.h" |
3ffd4af2 | 22 | #include "fd-util.h" |
0d39fa9c | 23 | #include "fileio.h" |
07630cea | 24 | #include "import-common.h" |
4a6d3523 | 25 | #include "missing.h" |
07630cea | 26 | #include "ratelimit.h" |
3cc44114 | 27 | #include "stat-util.h" |
07630cea LP |
28 | #include "string-util.h" |
29 | #include "util.h" | |
587fec42 LP |
30 | |
31 | #define COPY_BUFFER_SIZE (16*1024) | |
32 | ||
33 | struct RawExport { | |
34 | sd_event *event; | |
35 | ||
36 | RawExportFinished on_finished; | |
37 | void *userdata; | |
38 | ||
39 | char *path; | |
40 | ||
41 | int input_fd; | |
42 | int output_fd; | |
43 | ||
44 | ImportCompress compress; | |
45 | ||
46 | sd_event_source *output_event_source; | |
47 | ||
48 | void *buffer; | |
49 | size_t buffer_size; | |
50 | size_t buffer_allocated; | |
51 | ||
52 | uint64_t written_compressed; | |
53 | uint64_t written_uncompressed; | |
54 | ||
55 | unsigned last_percent; | |
56 | RateLimit progress_rate_limit; | |
57 | ||
58 | struct stat st; | |
59 | ||
60 | bool eof; | |
61 | bool tried_reflink; | |
62 | bool tried_sendfile; | |
63 | }; | |
64 | ||
65 | RawExport *raw_export_unref(RawExport *e) { | |
66 | if (!e) | |
67 | return NULL; | |
68 | ||
69 | sd_event_source_unref(e->output_event_source); | |
70 | ||
71 | import_compress_free(&e->compress); | |
72 | ||
73 | sd_event_unref(e->event); | |
74 | ||
75 | safe_close(e->input_fd); | |
76 | ||
77 | free(e->buffer); | |
78 | free(e->path); | |
6b430fdb | 79 | return mfree(e); |
587fec42 LP |
80 | } |
81 | ||
82 | int raw_export_new( | |
83 | RawExport **ret, | |
84 | sd_event *event, | |
85 | RawExportFinished on_finished, | |
86 | void *userdata) { | |
87 | ||
88 | _cleanup_(raw_export_unrefp) RawExport *e = NULL; | |
89 | int r; | |
90 | ||
91 | assert(ret); | |
92 | ||
93 | e = new0(RawExport, 1); | |
94 | if (!e) | |
95 | return -ENOMEM; | |
96 | ||
97 | e->output_fd = e->input_fd = -1; | |
98 | e->on_finished = on_finished; | |
99 | e->userdata = userdata; | |
100 | ||
101 | RATELIMIT_INIT(e->progress_rate_limit, 100 * USEC_PER_MSEC, 1); | |
102 | e->last_percent = (unsigned) -1; | |
103 | ||
104 | if (event) | |
105 | e->event = sd_event_ref(event); | |
106 | else { | |
107 | r = sd_event_default(&e->event); | |
108 | if (r < 0) | |
109 | return r; | |
110 | } | |
111 | ||
1cc6c93a | 112 | *ret = TAKE_PTR(e); |
587fec42 LP |
113 | |
114 | return 0; | |
115 | } | |
116 | ||
117 | static void raw_export_report_progress(RawExport *e) { | |
118 | unsigned percent; | |
119 | assert(e); | |
120 | ||
121 | if (e->written_uncompressed >= (uint64_t) e->st.st_size) | |
122 | percent = 100; | |
123 | else | |
124 | percent = (unsigned) ((e->written_uncompressed * UINT64_C(100)) / (uint64_t) e->st.st_size); | |
125 | ||
126 | if (percent == e->last_percent) | |
127 | return; | |
128 | ||
129 | if (!ratelimit_test(&e->progress_rate_limit)) | |
130 | return; | |
131 | ||
132 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
133 | log_info("Exported %u%%.", percent); | |
134 | ||
135 | e->last_percent = percent; | |
136 | } | |
137 | ||
138 | static int raw_export_process(RawExport *e) { | |
139 | ssize_t l; | |
140 | int r; | |
141 | ||
142 | assert(e); | |
143 | ||
144 | if (!e->tried_reflink && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) { | |
145 | ||
146 | /* If we shall take an uncompressed snapshot we can | |
147 | * reflink source to destination directly. Let's see | |
148 | * if this works. */ | |
149 | ||
150 | r = btrfs_reflink(e->input_fd, e->output_fd); | |
151 | if (r >= 0) { | |
152 | r = 0; | |
153 | goto finish; | |
154 | } | |
155 | ||
156 | e->tried_reflink = true; | |
157 | } | |
158 | ||
159 | if (!e->tried_sendfile && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) { | |
160 | ||
161 | l = sendfile(e->output_fd, e->input_fd, NULL, COPY_BUFFER_SIZE); | |
162 | if (l < 0) { | |
163 | if (errno == EAGAIN) | |
164 | return 0; | |
165 | ||
166 | e->tried_sendfile = true; | |
167 | } else if (l == 0) { | |
168 | r = 0; | |
169 | goto finish; | |
170 | } else { | |
171 | e->written_uncompressed += l; | |
172 | e->written_compressed += l; | |
173 | ||
174 | raw_export_report_progress(e); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | } | |
179 | ||
180 | while (e->buffer_size <= 0) { | |
181 | uint8_t input[COPY_BUFFER_SIZE]; | |
182 | ||
183 | if (e->eof) { | |
184 | r = 0; | |
185 | goto finish; | |
186 | } | |
187 | ||
188 | l = read(e->input_fd, input, sizeof(input)); | |
189 | if (l < 0) { | |
190 | r = log_error_errno(errno, "Failed to read raw file: %m"); | |
191 | goto finish; | |
192 | } | |
193 | ||
194 | if (l == 0) { | |
195 | e->eof = true; | |
196 | r = import_compress_finish(&e->compress, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
197 | } else { | |
198 | e->written_uncompressed += l; | |
199 | r = import_compress(&e->compress, input, l, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
200 | } | |
201 | if (r < 0) { | |
202 | r = log_error_errno(r, "Failed to encode: %m"); | |
203 | goto finish; | |
204 | } | |
205 | } | |
206 | ||
207 | l = write(e->output_fd, e->buffer, e->buffer_size); | |
208 | if (l < 0) { | |
209 | if (errno == EAGAIN) | |
210 | return 0; | |
211 | ||
212 | r = log_error_errno(errno, "Failed to write output file: %m"); | |
213 | goto finish; | |
214 | } | |
215 | ||
216 | assert((size_t) l <= e->buffer_size); | |
217 | memmove(e->buffer, (uint8_t*) e->buffer + l, e->buffer_size - l); | |
218 | e->buffer_size -= l; | |
219 | e->written_compressed += l; | |
220 | ||
221 | raw_export_report_progress(e); | |
222 | ||
223 | return 0; | |
224 | ||
225 | finish: | |
226 | if (r >= 0) { | |
227 | (void) copy_times(e->input_fd, e->output_fd); | |
228 | (void) copy_xattr(e->input_fd, e->output_fd); | |
229 | } | |
230 | ||
231 | if (e->on_finished) | |
232 | e->on_finished(e, r, e->userdata); | |
233 | else | |
234 | sd_event_exit(e->event, r); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static int raw_export_on_output(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
240 | RawExport *i = userdata; | |
241 | ||
242 | return raw_export_process(i); | |
243 | } | |
244 | ||
245 | static int raw_export_on_defer(sd_event_source *s, void *userdata) { | |
246 | RawExport *i = userdata; | |
247 | ||
248 | return raw_export_process(i); | |
249 | } | |
250 | ||
251 | static int reflink_snapshot(int fd, const char *path) { | |
252 | char *p, *d; | |
253 | int new_fd, r; | |
254 | ||
255 | p = strdupa(path); | |
256 | d = dirname(p); | |
257 | ||
258 | new_fd = open(d, O_TMPFILE|O_CLOEXEC|O_NOCTTY|O_RDWR, 0600); | |
259 | if (new_fd < 0) { | |
260 | _cleanup_free_ char *t = NULL; | |
261 | ||
14bcf25c | 262 | r = tempfn_random(path, NULL, &t); |
587fec42 LP |
263 | if (r < 0) |
264 | return r; | |
265 | ||
266 | new_fd = open(t, O_CLOEXEC|O_CREAT|O_NOCTTY|O_RDWR, 0600); | |
267 | if (new_fd < 0) | |
268 | return -errno; | |
269 | ||
270 | (void) unlink(t); | |
271 | } | |
272 | ||
273 | r = btrfs_reflink(fd, new_fd); | |
274 | if (r < 0) { | |
275 | safe_close(new_fd); | |
276 | return r; | |
277 | } | |
278 | ||
279 | return new_fd; | |
280 | } | |
281 | ||
282 | int raw_export_start(RawExport *e, const char *path, int fd, ImportCompressType compress) { | |
283 | _cleanup_close_ int sfd = -1, tfd = -1; | |
284 | int r; | |
285 | ||
286 | assert(e); | |
287 | assert(path); | |
288 | assert(fd >= 0); | |
289 | assert(compress < _IMPORT_COMPRESS_TYPE_MAX); | |
290 | assert(compress != IMPORT_COMPRESS_UNKNOWN); | |
291 | ||
292 | if (e->output_fd >= 0) | |
293 | return -EBUSY; | |
294 | ||
295 | r = fd_nonblock(fd, true); | |
296 | if (r < 0) | |
297 | return r; | |
298 | ||
299 | r = free_and_strdup(&e->path, path); | |
300 | if (r < 0) | |
301 | return r; | |
302 | ||
303 | sfd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
304 | if (sfd < 0) | |
305 | return -errno; | |
306 | ||
307 | if (fstat(sfd, &e->st) < 0) | |
308 | return -errno; | |
3cc44114 LP |
309 | r = stat_verify_regular(&e->st); |
310 | if (r < 0) | |
311 | return r; | |
587fec42 LP |
312 | |
313 | /* Try to take a reflink snapshot of the file, if we can t make the export atomic */ | |
314 | tfd = reflink_snapshot(sfd, path); | |
c10d6bdb LP |
315 | if (tfd >= 0) |
316 | e->input_fd = TAKE_FD(tfd); | |
317 | else | |
318 | e->input_fd = TAKE_FD(sfd); | |
587fec42 LP |
319 | |
320 | r = import_compress_init(&e->compress, compress); | |
321 | if (r < 0) | |
322 | return r; | |
323 | ||
324 | r = sd_event_add_io(e->event, &e->output_event_source, fd, EPOLLOUT, raw_export_on_output, e); | |
325 | if (r == -EPERM) { | |
326 | r = sd_event_add_defer(e->event, &e->output_event_source, raw_export_on_defer, e); | |
327 | if (r < 0) | |
328 | return r; | |
329 | ||
330 | r = sd_event_source_set_enabled(e->output_event_source, SD_EVENT_ON); | |
331 | } | |
332 | if (r < 0) | |
333 | return r; | |
334 | ||
335 | e->output_fd = fd; | |
336 | return r; | |
337 | } |