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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
587fec42 | 2 | /*** |
587fec42 | 3 | Copyright 2015 Lennart Poettering |
587fec42 LP |
4 | ***/ |
5 | ||
6 | #include <sys/sendfile.h> | |
cf0fbc49 TA |
7 | |
8 | /* When we include libgen.h because we need dirname() we immediately | |
9 | * undefine basename() since libgen.h defines it as a macro to the POSIX | |
10 | * version which is really broken. We prefer GNU basename(). */ | |
587fec42 LP |
11 | #include <libgen.h> |
12 | #undef basename | |
13 | ||
14 | #include "sd-daemon.h" | |
07630cea | 15 | |
b5efdb8a | 16 | #include "alloc-util.h" |
587fec42 LP |
17 | #include "btrfs-util.h" |
18 | #include "copy.h" | |
587fec42 | 19 | #include "export-raw.h" |
3ffd4af2 | 20 | #include "fd-util.h" |
0d39fa9c | 21 | #include "fileio.h" |
07630cea | 22 | #include "import-common.h" |
4a6d3523 | 23 | #include "missing.h" |
07630cea | 24 | #include "ratelimit.h" |
3cc44114 | 25 | #include "stat-util.h" |
07630cea LP |
26 | #include "string-util.h" |
27 | #include "util.h" | |
587fec42 LP |
28 | |
29 | #define COPY_BUFFER_SIZE (16*1024) | |
30 | ||
31 | struct RawExport { | |
32 | sd_event *event; | |
33 | ||
34 | RawExportFinished on_finished; | |
35 | void *userdata; | |
36 | ||
37 | char *path; | |
38 | ||
39 | int input_fd; | |
40 | int output_fd; | |
41 | ||
42 | ImportCompress compress; | |
43 | ||
44 | sd_event_source *output_event_source; | |
45 | ||
46 | void *buffer; | |
47 | size_t buffer_size; | |
48 | size_t buffer_allocated; | |
49 | ||
50 | uint64_t written_compressed; | |
51 | uint64_t written_uncompressed; | |
52 | ||
53 | unsigned last_percent; | |
54 | RateLimit progress_rate_limit; | |
55 | ||
56 | struct stat st; | |
57 | ||
58 | bool eof; | |
59 | bool tried_reflink; | |
60 | bool tried_sendfile; | |
61 | }; | |
62 | ||
63 | RawExport *raw_export_unref(RawExport *e) { | |
64 | if (!e) | |
65 | return NULL; | |
66 | ||
67 | sd_event_source_unref(e->output_event_source); | |
68 | ||
69 | import_compress_free(&e->compress); | |
70 | ||
71 | sd_event_unref(e->event); | |
72 | ||
73 | safe_close(e->input_fd); | |
74 | ||
75 | free(e->buffer); | |
76 | free(e->path); | |
6b430fdb | 77 | return mfree(e); |
587fec42 LP |
78 | } |
79 | ||
80 | int raw_export_new( | |
81 | RawExport **ret, | |
82 | sd_event *event, | |
83 | RawExportFinished on_finished, | |
84 | void *userdata) { | |
85 | ||
86 | _cleanup_(raw_export_unrefp) RawExport *e = NULL; | |
87 | int r; | |
88 | ||
89 | assert(ret); | |
90 | ||
91 | e = new0(RawExport, 1); | |
92 | if (!e) | |
93 | return -ENOMEM; | |
94 | ||
95 | e->output_fd = e->input_fd = -1; | |
96 | e->on_finished = on_finished; | |
97 | e->userdata = userdata; | |
98 | ||
99 | RATELIMIT_INIT(e->progress_rate_limit, 100 * USEC_PER_MSEC, 1); | |
100 | e->last_percent = (unsigned) -1; | |
101 | ||
102 | if (event) | |
103 | e->event = sd_event_ref(event); | |
104 | else { | |
105 | r = sd_event_default(&e->event); | |
106 | if (r < 0) | |
107 | return r; | |
108 | } | |
109 | ||
1cc6c93a | 110 | *ret = TAKE_PTR(e); |
587fec42 LP |
111 | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static void raw_export_report_progress(RawExport *e) { | |
116 | unsigned percent; | |
117 | assert(e); | |
118 | ||
119 | if (e->written_uncompressed >= (uint64_t) e->st.st_size) | |
120 | percent = 100; | |
121 | else | |
122 | percent = (unsigned) ((e->written_uncompressed * UINT64_C(100)) / (uint64_t) e->st.st_size); | |
123 | ||
124 | if (percent == e->last_percent) | |
125 | return; | |
126 | ||
7994ac1d | 127 | if (!ratelimit_below(&e->progress_rate_limit)) |
587fec42 LP |
128 | return; |
129 | ||
130 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
131 | log_info("Exported %u%%.", percent); | |
132 | ||
133 | e->last_percent = percent; | |
134 | } | |
135 | ||
136 | static int raw_export_process(RawExport *e) { | |
137 | ssize_t l; | |
138 | int r; | |
139 | ||
140 | assert(e); | |
141 | ||
142 | if (!e->tried_reflink && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) { | |
143 | ||
144 | /* If we shall take an uncompressed snapshot we can | |
145 | * reflink source to destination directly. Let's see | |
146 | * if this works. */ | |
147 | ||
148 | r = btrfs_reflink(e->input_fd, e->output_fd); | |
149 | if (r >= 0) { | |
150 | r = 0; | |
151 | goto finish; | |
152 | } | |
153 | ||
154 | e->tried_reflink = true; | |
155 | } | |
156 | ||
157 | if (!e->tried_sendfile && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) { | |
158 | ||
159 | l = sendfile(e->output_fd, e->input_fd, NULL, COPY_BUFFER_SIZE); | |
160 | if (l < 0) { | |
161 | if (errno == EAGAIN) | |
162 | return 0; | |
163 | ||
164 | e->tried_sendfile = true; | |
165 | } else if (l == 0) { | |
166 | r = 0; | |
167 | goto finish; | |
168 | } else { | |
169 | e->written_uncompressed += l; | |
170 | e->written_compressed += l; | |
171 | ||
172 | raw_export_report_progress(e); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | } | |
177 | ||
178 | while (e->buffer_size <= 0) { | |
179 | uint8_t input[COPY_BUFFER_SIZE]; | |
180 | ||
181 | if (e->eof) { | |
182 | r = 0; | |
183 | goto finish; | |
184 | } | |
185 | ||
186 | l = read(e->input_fd, input, sizeof(input)); | |
187 | if (l < 0) { | |
188 | r = log_error_errno(errno, "Failed to read raw file: %m"); | |
189 | goto finish; | |
190 | } | |
191 | ||
192 | if (l == 0) { | |
193 | e->eof = true; | |
194 | r = import_compress_finish(&e->compress, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
195 | } else { | |
196 | e->written_uncompressed += l; | |
197 | r = import_compress(&e->compress, input, l, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
198 | } | |
199 | if (r < 0) { | |
200 | r = log_error_errno(r, "Failed to encode: %m"); | |
201 | goto finish; | |
202 | } | |
203 | } | |
204 | ||
205 | l = write(e->output_fd, e->buffer, e->buffer_size); | |
206 | if (l < 0) { | |
207 | if (errno == EAGAIN) | |
208 | return 0; | |
209 | ||
210 | r = log_error_errno(errno, "Failed to write output file: %m"); | |
211 | goto finish; | |
212 | } | |
213 | ||
214 | assert((size_t) l <= e->buffer_size); | |
215 | memmove(e->buffer, (uint8_t*) e->buffer + l, e->buffer_size - l); | |
216 | e->buffer_size -= l; | |
217 | e->written_compressed += l; | |
218 | ||
219 | raw_export_report_progress(e); | |
220 | ||
221 | return 0; | |
222 | ||
223 | finish: | |
224 | if (r >= 0) { | |
225 | (void) copy_times(e->input_fd, e->output_fd); | |
226 | (void) copy_xattr(e->input_fd, e->output_fd); | |
227 | } | |
228 | ||
229 | if (e->on_finished) | |
230 | e->on_finished(e, r, e->userdata); | |
231 | else | |
232 | sd_event_exit(e->event, r); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static int raw_export_on_output(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
238 | RawExport *i = userdata; | |
239 | ||
240 | return raw_export_process(i); | |
241 | } | |
242 | ||
243 | static int raw_export_on_defer(sd_event_source *s, void *userdata) { | |
244 | RawExport *i = userdata; | |
245 | ||
246 | return raw_export_process(i); | |
247 | } | |
248 | ||
249 | static int reflink_snapshot(int fd, const char *path) { | |
250 | char *p, *d; | |
251 | int new_fd, r; | |
252 | ||
253 | p = strdupa(path); | |
254 | d = dirname(p); | |
255 | ||
256 | new_fd = open(d, O_TMPFILE|O_CLOEXEC|O_NOCTTY|O_RDWR, 0600); | |
257 | if (new_fd < 0) { | |
258 | _cleanup_free_ char *t = NULL; | |
259 | ||
14bcf25c | 260 | r = tempfn_random(path, NULL, &t); |
587fec42 LP |
261 | if (r < 0) |
262 | return r; | |
263 | ||
264 | new_fd = open(t, O_CLOEXEC|O_CREAT|O_NOCTTY|O_RDWR, 0600); | |
265 | if (new_fd < 0) | |
266 | return -errno; | |
267 | ||
268 | (void) unlink(t); | |
269 | } | |
270 | ||
271 | r = btrfs_reflink(fd, new_fd); | |
272 | if (r < 0) { | |
273 | safe_close(new_fd); | |
274 | return r; | |
275 | } | |
276 | ||
277 | return new_fd; | |
278 | } | |
279 | ||
280 | int raw_export_start(RawExport *e, const char *path, int fd, ImportCompressType compress) { | |
281 | _cleanup_close_ int sfd = -1, tfd = -1; | |
282 | int r; | |
283 | ||
284 | assert(e); | |
285 | assert(path); | |
286 | assert(fd >= 0); | |
287 | assert(compress < _IMPORT_COMPRESS_TYPE_MAX); | |
288 | assert(compress != IMPORT_COMPRESS_UNKNOWN); | |
289 | ||
290 | if (e->output_fd >= 0) | |
291 | return -EBUSY; | |
292 | ||
293 | r = fd_nonblock(fd, true); | |
294 | if (r < 0) | |
295 | return r; | |
296 | ||
297 | r = free_and_strdup(&e->path, path); | |
298 | if (r < 0) | |
299 | return r; | |
300 | ||
301 | sfd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
302 | if (sfd < 0) | |
303 | return -errno; | |
304 | ||
305 | if (fstat(sfd, &e->st) < 0) | |
306 | return -errno; | |
3cc44114 LP |
307 | r = stat_verify_regular(&e->st); |
308 | if (r < 0) | |
309 | return r; | |
587fec42 LP |
310 | |
311 | /* Try to take a reflink snapshot of the file, if we can t make the export atomic */ | |
312 | tfd = reflink_snapshot(sfd, path); | |
c10d6bdb LP |
313 | if (tfd >= 0) |
314 | e->input_fd = TAKE_FD(tfd); | |
315 | else | |
316 | e->input_fd = TAKE_FD(sfd); | |
587fec42 LP |
317 | |
318 | r = import_compress_init(&e->compress, compress); | |
319 | if (r < 0) | |
320 | return r; | |
321 | ||
322 | r = sd_event_add_io(e->event, &e->output_event_source, fd, EPOLLOUT, raw_export_on_output, e); | |
323 | if (r == -EPERM) { | |
324 | r = sd_event_add_defer(e->event, &e->output_event_source, raw_export_on_defer, e); | |
325 | if (r < 0) | |
326 | return r; | |
327 | ||
328 | r = sd_event_source_set_enabled(e->output_event_source, SD_EVENT_ON); | |
329 | } | |
330 | if (r < 0) | |
331 | return r; | |
332 | ||
333 | e->output_fd = fd; | |
334 | return r; | |
335 | } |