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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
587fec42 | 2 | |
587fec42 | 3 | #include "sd-daemon.h" |
07630cea | 4 | |
b5efdb8a | 5 | #include "alloc-util.h" |
587fec42 | 6 | #include "btrfs-util.h" |
3ffd4af2 LP |
7 | #include "export-tar.h" |
8 | #include "fd-util.h" | |
587fec42 | 9 | #include "import-common.h" |
0b452006 | 10 | #include "process-util.h" |
07630cea LP |
11 | #include "ratelimit.h" |
12 | #include "string-util.h" | |
e4de7287 | 13 | #include "tmpfile-util.h" |
587fec42 LP |
14 | |
15 | #define COPY_BUFFER_SIZE (16*1024) | |
16 | ||
17 | struct TarExport { | |
18 | sd_event *event; | |
19 | ||
20 | TarExportFinished on_finished; | |
21 | void *userdata; | |
22 | ||
23 | char *path; | |
24 | char *temp_path; | |
25 | ||
26 | int output_fd; | |
27 | int tar_fd; | |
28 | ||
29 | ImportCompress compress; | |
30 | ||
31 | sd_event_source *output_event_source; | |
32 | ||
33 | void *buffer; | |
34 | size_t buffer_size; | |
35 | size_t buffer_allocated; | |
36 | ||
37 | uint64_t written_compressed; | |
38 | uint64_t written_uncompressed; | |
39 | ||
40 | pid_t tar_pid; | |
41 | ||
42 | struct stat st; | |
43 | uint64_t quota_referenced; | |
44 | ||
45 | unsigned last_percent; | |
5ac1530e | 46 | RateLimit progress_ratelimit; |
587fec42 LP |
47 | |
48 | bool eof; | |
49 | bool tried_splice; | |
50 | }; | |
51 | ||
52 | TarExport *tar_export_unref(TarExport *e) { | |
53 | if (!e) | |
54 | return NULL; | |
55 | ||
56 | sd_event_source_unref(e->output_event_source); | |
57 | ||
7950211d LP |
58 | if (e->tar_pid > 1) |
59 | sigkill_wait(e->tar_pid); | |
587fec42 LP |
60 | |
61 | if (e->temp_path) { | |
5bcd08db | 62 | (void) btrfs_subvol_remove(e->temp_path, BTRFS_REMOVE_QUOTA); |
587fec42 LP |
63 | free(e->temp_path); |
64 | } | |
65 | ||
66 | import_compress_free(&e->compress); | |
67 | ||
68 | sd_event_unref(e->event); | |
69 | ||
70 | safe_close(e->tar_fd); | |
71 | ||
72 | free(e->buffer); | |
73 | free(e->path); | |
6b430fdb | 74 | return mfree(e); |
587fec42 LP |
75 | } |
76 | ||
77 | int tar_export_new( | |
78 | TarExport **ret, | |
79 | sd_event *event, | |
80 | TarExportFinished on_finished, | |
81 | void *userdata) { | |
82 | ||
83 | _cleanup_(tar_export_unrefp) TarExport *e = NULL; | |
84 | int r; | |
85 | ||
86 | assert(ret); | |
87 | ||
0d94088e | 88 | e = new(TarExport, 1); |
587fec42 LP |
89 | if (!e) |
90 | return -ENOMEM; | |
91 | ||
0d94088e | 92 | *e = (TarExport) { |
254d1313 ZJS |
93 | .output_fd = -EBADF, |
94 | .tar_fd = -EBADF, | |
0d94088e YW |
95 | .on_finished = on_finished, |
96 | .userdata = userdata, | |
f5fbe71d YW |
97 | .quota_referenced = UINT64_MAX, |
98 | .last_percent = UINT_MAX, | |
5ac1530e | 99 | .progress_ratelimit = { 100 * USEC_PER_MSEC, 1 }, |
0d94088e | 100 | }; |
587fec42 | 101 | |
587fec42 LP |
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 tar_export_report_progress(TarExport *e) { | |
116 | unsigned percent; | |
117 | assert(e); | |
118 | ||
e5f270f5 | 119 | /* Do we have any quota info? If not, we don't know anything about the progress */ |
f5fbe71d | 120 | if (e->quota_referenced == UINT64_MAX) |
587fec42 LP |
121 | return; |
122 | ||
123 | if (e->written_uncompressed >= e->quota_referenced) | |
124 | percent = 100; | |
125 | else | |
126 | percent = (unsigned) ((e->written_uncompressed * UINT64_C(100)) / e->quota_referenced); | |
127 | ||
128 | if (percent == e->last_percent) | |
129 | return; | |
130 | ||
5ac1530e | 131 | if (!ratelimit_below(&e->progress_ratelimit)) |
587fec42 LP |
132 | return; |
133 | ||
134 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
135 | log_info("Exported %u%%.", percent); | |
136 | ||
137 | e->last_percent = percent; | |
138 | } | |
139 | ||
82f299e7 LP |
140 | static int tar_export_finish(TarExport *e) { |
141 | int r; | |
142 | ||
143 | assert(e); | |
144 | assert(e->tar_fd >= 0); | |
145 | ||
146 | if (e->tar_pid > 0) { | |
8f03de53 | 147 | r = wait_for_terminate_and_check("tar", TAKE_PID(e->tar_pid), WAIT_LOG); |
82f299e7 LP |
148 | if (r < 0) |
149 | return r; | |
150 | if (r != EXIT_SUCCESS) | |
151 | return -EPROTO; | |
152 | } | |
153 | ||
154 | e->tar_fd = safe_close(e->tar_fd); | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
587fec42 LP |
159 | static int tar_export_process(TarExport *e) { |
160 | ssize_t l; | |
161 | int r; | |
162 | ||
163 | assert(e); | |
164 | ||
165 | if (!e->tried_splice && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) { | |
166 | ||
167 | l = splice(e->tar_fd, NULL, e->output_fd, NULL, COPY_BUFFER_SIZE, 0); | |
168 | if (l < 0) { | |
169 | if (errno == EAGAIN) | |
170 | return 0; | |
171 | ||
172 | e->tried_splice = true; | |
173 | } else if (l == 0) { | |
82f299e7 | 174 | r = tar_export_finish(e); |
587fec42 LP |
175 | goto finish; |
176 | } else { | |
177 | e->written_uncompressed += l; | |
178 | e->written_compressed += l; | |
179 | ||
180 | tar_export_report_progress(e); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | } | |
185 | ||
186 | while (e->buffer_size <= 0) { | |
187 | uint8_t input[COPY_BUFFER_SIZE]; | |
188 | ||
189 | if (e->eof) { | |
82f299e7 | 190 | r = tar_export_finish(e); |
587fec42 LP |
191 | goto finish; |
192 | } | |
193 | ||
194 | l = read(e->tar_fd, input, sizeof(input)); | |
195 | if (l < 0) { | |
196 | r = log_error_errno(errno, "Failed to read tar file: %m"); | |
197 | goto finish; | |
198 | } | |
199 | ||
200 | if (l == 0) { | |
201 | e->eof = true; | |
202 | r = import_compress_finish(&e->compress, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
203 | } else { | |
204 | e->written_uncompressed += l; | |
205 | r = import_compress(&e->compress, input, l, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
206 | } | |
207 | if (r < 0) { | |
208 | r = log_error_errno(r, "Failed to encode: %m"); | |
209 | goto finish; | |
210 | } | |
211 | } | |
212 | ||
213 | l = write(e->output_fd, e->buffer, e->buffer_size); | |
214 | if (l < 0) { | |
215 | if (errno == EAGAIN) | |
216 | return 0; | |
217 | ||
218 | r = log_error_errno(errno, "Failed to write output file: %m"); | |
219 | goto finish; | |
220 | } | |
221 | ||
222 | assert((size_t) l <= e->buffer_size); | |
223 | memmove(e->buffer, (uint8_t*) e->buffer + l, e->buffer_size - l); | |
224 | e->buffer_size -= l; | |
225 | e->written_compressed += l; | |
226 | ||
227 | tar_export_report_progress(e); | |
228 | ||
229 | return 0; | |
230 | ||
231 | finish: | |
232 | if (e->on_finished) | |
233 | e->on_finished(e, r, e->userdata); | |
234 | else | |
235 | sd_event_exit(e->event, r); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static int tar_export_on_output(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
241 | TarExport *i = userdata; | |
242 | ||
243 | return tar_export_process(i); | |
244 | } | |
245 | ||
246 | static int tar_export_on_defer(sd_event_source *s, void *userdata) { | |
247 | TarExport *i = userdata; | |
248 | ||
249 | return tar_export_process(i); | |
250 | } | |
251 | ||
252 | int tar_export_start(TarExport *e, const char *path, int fd, ImportCompressType compress) { | |
254d1313 | 253 | _cleanup_close_ int sfd = -EBADF; |
587fec42 LP |
254 | int r; |
255 | ||
256 | assert(e); | |
257 | assert(path); | |
258 | assert(fd >= 0); | |
259 | assert(compress < _IMPORT_COMPRESS_TYPE_MAX); | |
260 | assert(compress != IMPORT_COMPRESS_UNKNOWN); | |
261 | ||
262 | if (e->output_fd >= 0) | |
263 | return -EBUSY; | |
264 | ||
265 | sfd = open(path, O_DIRECTORY|O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
266 | if (sfd < 0) | |
267 | return -errno; | |
268 | ||
269 | if (fstat(sfd, &e->st) < 0) | |
270 | return -errno; | |
271 | ||
272 | r = fd_nonblock(fd, true); | |
273 | if (r < 0) | |
274 | return r; | |
275 | ||
276 | r = free_and_strdup(&e->path, path); | |
277 | if (r < 0) | |
278 | return r; | |
279 | ||
f5fbe71d | 280 | e->quota_referenced = UINT64_MAX; |
587fec42 | 281 | |
674b04ff | 282 | if (btrfs_might_be_subvol(&e->st)) { |
587fec42 LP |
283 | BtrfsQuotaInfo q; |
284 | ||
5bcd08db | 285 | r = btrfs_subvol_get_subtree_quota_fd(sfd, 0, &q); |
587fec42 | 286 | if (r >= 0) |
cb81cd80 | 287 | e->quota_referenced = q.referenced; |
587fec42 | 288 | |
a1e58e8e | 289 | e->temp_path = mfree(e->temp_path); |
587fec42 | 290 | |
14bcf25c | 291 | r = tempfn_random(path, NULL, &e->temp_path); |
587fec42 LP |
292 | if (r < 0) |
293 | return r; | |
294 | ||
295 | /* Let's try to make a snapshot, if we can, so that the export is atomic */ | |
f70a17f8 | 296 | r = btrfs_subvol_snapshot_fd(sfd, e->temp_path, BTRFS_SNAPSHOT_READ_ONLY|BTRFS_SNAPSHOT_RECURSIVE); |
587fec42 LP |
297 | if (r < 0) { |
298 | log_debug_errno(r, "Couldn't create snapshot %s of %s, not exporting atomically: %m", e->temp_path, path); | |
a1e58e8e | 299 | e->temp_path = mfree(e->temp_path); |
587fec42 LP |
300 | } |
301 | } | |
302 | ||
303 | r = import_compress_init(&e->compress, compress); | |
304 | if (r < 0) | |
305 | return r; | |
306 | ||
307 | r = sd_event_add_io(e->event, &e->output_event_source, fd, EPOLLOUT, tar_export_on_output, e); | |
308 | if (r == -EPERM) { | |
309 | r = sd_event_add_defer(e->event, &e->output_event_source, tar_export_on_defer, e); | |
310 | if (r < 0) | |
311 | return r; | |
312 | ||
313 | r = sd_event_source_set_enabled(e->output_event_source, SD_EVENT_ON); | |
314 | } | |
315 | if (r < 0) | |
316 | return r; | |
317 | ||
318 | e->tar_fd = import_fork_tar_c(e->temp_path ?: e->path, &e->tar_pid); | |
319 | if (e->tar_fd < 0) { | |
320 | e->output_event_source = sd_event_source_unref(e->output_event_source); | |
321 | return e->tar_fd; | |
322 | } | |
323 | ||
324 | e->output_fd = fd; | |
325 | return r; | |
326 | } |