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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
587fec42 LP |
2 | |
3 | #include <sys/sendfile.h> | |
cf0fbc49 TA |
4 | |
5 | /* When we include libgen.h because we need dirname() we immediately | |
6 | * undefine basename() since libgen.h defines it as a macro to the POSIX | |
7 | * version which is really broken. We prefer GNU basename(). */ | |
587fec42 LP |
8 | #include <libgen.h> |
9 | #undef basename | |
10 | ||
11 | #include "sd-daemon.h" | |
07630cea | 12 | |
b5efdb8a | 13 | #include "alloc-util.h" |
587fec42 LP |
14 | #include "btrfs-util.h" |
15 | #include "copy.h" | |
587fec42 | 16 | #include "export-raw.h" |
3ffd4af2 | 17 | #include "fd-util.h" |
0d39fa9c | 18 | #include "fileio.h" |
0c462ea4 | 19 | #include "fs-util.h" |
07630cea | 20 | #include "import-common.h" |
4a6d3523 | 21 | #include "missing.h" |
07630cea | 22 | #include "ratelimit.h" |
3cc44114 | 23 | #include "stat-util.h" |
07630cea LP |
24 | #include "string-util.h" |
25 | #include "util.h" | |
587fec42 LP |
26 | |
27 | #define COPY_BUFFER_SIZE (16*1024) | |
28 | ||
29 | struct RawExport { | |
30 | sd_event *event; | |
31 | ||
32 | RawExportFinished on_finished; | |
33 | void *userdata; | |
34 | ||
35 | char *path; | |
36 | ||
37 | int input_fd; | |
38 | int output_fd; | |
39 | ||
40 | ImportCompress compress; | |
41 | ||
42 | sd_event_source *output_event_source; | |
43 | ||
44 | void *buffer; | |
45 | size_t buffer_size; | |
46 | size_t buffer_allocated; | |
47 | ||
48 | uint64_t written_compressed; | |
49 | uint64_t written_uncompressed; | |
50 | ||
51 | unsigned last_percent; | |
52 | RateLimit progress_rate_limit; | |
53 | ||
54 | struct stat st; | |
55 | ||
56 | bool eof; | |
57 | bool tried_reflink; | |
58 | bool tried_sendfile; | |
59 | }; | |
60 | ||
61 | RawExport *raw_export_unref(RawExport *e) { | |
62 | if (!e) | |
63 | return NULL; | |
64 | ||
65 | sd_event_source_unref(e->output_event_source); | |
66 | ||
67 | import_compress_free(&e->compress); | |
68 | ||
69 | sd_event_unref(e->event); | |
70 | ||
71 | safe_close(e->input_fd); | |
72 | ||
73 | free(e->buffer); | |
74 | free(e->path); | |
6b430fdb | 75 | return mfree(e); |
587fec42 LP |
76 | } |
77 | ||
78 | int raw_export_new( | |
79 | RawExport **ret, | |
80 | sd_event *event, | |
81 | RawExportFinished on_finished, | |
82 | void *userdata) { | |
83 | ||
84 | _cleanup_(raw_export_unrefp) RawExport *e = NULL; | |
85 | int r; | |
86 | ||
87 | assert(ret); | |
88 | ||
89 | e = new0(RawExport, 1); | |
90 | if (!e) | |
91 | return -ENOMEM; | |
92 | ||
93 | e->output_fd = e->input_fd = -1; | |
94 | e->on_finished = on_finished; | |
95 | e->userdata = userdata; | |
96 | ||
97 | RATELIMIT_INIT(e->progress_rate_limit, 100 * USEC_PER_MSEC, 1); | |
98 | e->last_percent = (unsigned) -1; | |
99 | ||
100 | if (event) | |
101 | e->event = sd_event_ref(event); | |
102 | else { | |
103 | r = sd_event_default(&e->event); | |
104 | if (r < 0) | |
105 | return r; | |
106 | } | |
107 | ||
1cc6c93a | 108 | *ret = TAKE_PTR(e); |
587fec42 LP |
109 | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static void raw_export_report_progress(RawExport *e) { | |
114 | unsigned percent; | |
115 | assert(e); | |
116 | ||
117 | if (e->written_uncompressed >= (uint64_t) e->st.st_size) | |
118 | percent = 100; | |
119 | else | |
120 | percent = (unsigned) ((e->written_uncompressed * UINT64_C(100)) / (uint64_t) e->st.st_size); | |
121 | ||
122 | if (percent == e->last_percent) | |
123 | return; | |
124 | ||
7994ac1d | 125 | if (!ratelimit_below(&e->progress_rate_limit)) |
587fec42 LP |
126 | return; |
127 | ||
128 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
129 | log_info("Exported %u%%.", percent); | |
130 | ||
131 | e->last_percent = percent; | |
132 | } | |
133 | ||
134 | static int raw_export_process(RawExport *e) { | |
135 | ssize_t l; | |
136 | int r; | |
137 | ||
138 | assert(e); | |
139 | ||
140 | if (!e->tried_reflink && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) { | |
141 | ||
142 | /* If we shall take an uncompressed snapshot we can | |
143 | * reflink source to destination directly. Let's see | |
144 | * if this works. */ | |
145 | ||
146 | r = btrfs_reflink(e->input_fd, e->output_fd); | |
147 | if (r >= 0) { | |
148 | r = 0; | |
149 | goto finish; | |
150 | } | |
151 | ||
152 | e->tried_reflink = true; | |
153 | } | |
154 | ||
155 | if (!e->tried_sendfile && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) { | |
156 | ||
157 | l = sendfile(e->output_fd, e->input_fd, NULL, COPY_BUFFER_SIZE); | |
158 | if (l < 0) { | |
159 | if (errno == EAGAIN) | |
160 | return 0; | |
161 | ||
162 | e->tried_sendfile = true; | |
163 | } else if (l == 0) { | |
164 | r = 0; | |
165 | goto finish; | |
166 | } else { | |
167 | e->written_uncompressed += l; | |
168 | e->written_compressed += l; | |
169 | ||
170 | raw_export_report_progress(e); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | } | |
175 | ||
176 | while (e->buffer_size <= 0) { | |
177 | uint8_t input[COPY_BUFFER_SIZE]; | |
178 | ||
179 | if (e->eof) { | |
180 | r = 0; | |
181 | goto finish; | |
182 | } | |
183 | ||
184 | l = read(e->input_fd, input, sizeof(input)); | |
185 | if (l < 0) { | |
186 | r = log_error_errno(errno, "Failed to read raw file: %m"); | |
187 | goto finish; | |
188 | } | |
189 | ||
190 | if (l == 0) { | |
191 | e->eof = true; | |
192 | r = import_compress_finish(&e->compress, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
193 | } else { | |
194 | e->written_uncompressed += l; | |
195 | r = import_compress(&e->compress, input, l, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
196 | } | |
197 | if (r < 0) { | |
198 | r = log_error_errno(r, "Failed to encode: %m"); | |
199 | goto finish; | |
200 | } | |
201 | } | |
202 | ||
203 | l = write(e->output_fd, e->buffer, e->buffer_size); | |
204 | if (l < 0) { | |
205 | if (errno == EAGAIN) | |
206 | return 0; | |
207 | ||
208 | r = log_error_errno(errno, "Failed to write output file: %m"); | |
209 | goto finish; | |
210 | } | |
211 | ||
212 | assert((size_t) l <= e->buffer_size); | |
213 | memmove(e->buffer, (uint8_t*) e->buffer + l, e->buffer_size - l); | |
214 | e->buffer_size -= l; | |
215 | e->written_compressed += l; | |
216 | ||
217 | raw_export_report_progress(e); | |
218 | ||
219 | return 0; | |
220 | ||
221 | finish: | |
222 | if (r >= 0) { | |
223 | (void) copy_times(e->input_fd, e->output_fd); | |
224 | (void) copy_xattr(e->input_fd, e->output_fd); | |
225 | } | |
226 | ||
227 | if (e->on_finished) | |
228 | e->on_finished(e, r, e->userdata); | |
229 | else | |
230 | sd_event_exit(e->event, r); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static int raw_export_on_output(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
236 | RawExport *i = userdata; | |
237 | ||
238 | return raw_export_process(i); | |
239 | } | |
240 | ||
241 | static int raw_export_on_defer(sd_event_source *s, void *userdata) { | |
242 | RawExport *i = userdata; | |
243 | ||
244 | return raw_export_process(i); | |
245 | } | |
246 | ||
247 | static int reflink_snapshot(int fd, const char *path) { | |
587fec42 LP |
248 | int new_fd, r; |
249 | ||
0c462ea4 | 250 | new_fd = open_parent(path, O_TMPFILE|O_CLOEXEC|O_RDWR, 0600); |
587fec42 LP |
251 | if (new_fd < 0) { |
252 | _cleanup_free_ char *t = NULL; | |
253 | ||
14bcf25c | 254 | r = tempfn_random(path, NULL, &t); |
587fec42 LP |
255 | if (r < 0) |
256 | return r; | |
257 | ||
258 | new_fd = open(t, O_CLOEXEC|O_CREAT|O_NOCTTY|O_RDWR, 0600); | |
259 | if (new_fd < 0) | |
260 | return -errno; | |
261 | ||
262 | (void) unlink(t); | |
263 | } | |
264 | ||
265 | r = btrfs_reflink(fd, new_fd); | |
266 | if (r < 0) { | |
267 | safe_close(new_fd); | |
268 | return r; | |
269 | } | |
270 | ||
271 | return new_fd; | |
272 | } | |
273 | ||
274 | int raw_export_start(RawExport *e, const char *path, int fd, ImportCompressType compress) { | |
275 | _cleanup_close_ int sfd = -1, tfd = -1; | |
276 | int r; | |
277 | ||
278 | assert(e); | |
279 | assert(path); | |
280 | assert(fd >= 0); | |
281 | assert(compress < _IMPORT_COMPRESS_TYPE_MAX); | |
282 | assert(compress != IMPORT_COMPRESS_UNKNOWN); | |
283 | ||
284 | if (e->output_fd >= 0) | |
285 | return -EBUSY; | |
286 | ||
287 | r = fd_nonblock(fd, true); | |
288 | if (r < 0) | |
289 | return r; | |
290 | ||
291 | r = free_and_strdup(&e->path, path); | |
292 | if (r < 0) | |
293 | return r; | |
294 | ||
295 | sfd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
296 | if (sfd < 0) | |
297 | return -errno; | |
298 | ||
299 | if (fstat(sfd, &e->st) < 0) | |
300 | return -errno; | |
3cc44114 LP |
301 | r = stat_verify_regular(&e->st); |
302 | if (r < 0) | |
303 | return r; | |
587fec42 LP |
304 | |
305 | /* Try to take a reflink snapshot of the file, if we can t make the export atomic */ | |
306 | tfd = reflink_snapshot(sfd, path); | |
c10d6bdb LP |
307 | if (tfd >= 0) |
308 | e->input_fd = TAKE_FD(tfd); | |
309 | else | |
310 | e->input_fd = TAKE_FD(sfd); | |
587fec42 LP |
311 | |
312 | r = import_compress_init(&e->compress, compress); | |
313 | if (r < 0) | |
314 | return r; | |
315 | ||
316 | r = sd_event_add_io(e->event, &e->output_event_source, fd, EPOLLOUT, raw_export_on_output, e); | |
317 | if (r == -EPERM) { | |
318 | r = sd_event_add_defer(e->event, &e->output_event_source, raw_export_on_defer, e); | |
319 | if (r < 0) | |
320 | return r; | |
321 | ||
322 | r = sd_event_source_set_enabled(e->output_event_source, SD_EVENT_ON); | |
323 | } | |
324 | if (r < 0) | |
325 | return r; | |
326 | ||
327 | e->output_fd = fd; | |
328 | return r; | |
329 | } |