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587fec42 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 | ||
587fec42 | 22 | #include "sd-daemon.h" |
07630cea | 23 | |
b5efdb8a | 24 | #include "alloc-util.h" |
587fec42 | 25 | #include "btrfs-util.h" |
3ffd4af2 LP |
26 | #include "export-tar.h" |
27 | #include "fd-util.h" | |
0d39fa9c | 28 | #include "fileio.h" |
587fec42 | 29 | #include "import-common.h" |
0b452006 | 30 | #include "process-util.h" |
07630cea LP |
31 | #include "ratelimit.h" |
32 | #include "string-util.h" | |
33 | #include "util.h" | |
587fec42 LP |
34 | |
35 | #define COPY_BUFFER_SIZE (16*1024) | |
36 | ||
37 | struct TarExport { | |
38 | sd_event *event; | |
39 | ||
40 | TarExportFinished on_finished; | |
41 | void *userdata; | |
42 | ||
43 | char *path; | |
44 | char *temp_path; | |
45 | ||
46 | int output_fd; | |
47 | int tar_fd; | |
48 | ||
49 | ImportCompress compress; | |
50 | ||
51 | sd_event_source *output_event_source; | |
52 | ||
53 | void *buffer; | |
54 | size_t buffer_size; | |
55 | size_t buffer_allocated; | |
56 | ||
57 | uint64_t written_compressed; | |
58 | uint64_t written_uncompressed; | |
59 | ||
60 | pid_t tar_pid; | |
61 | ||
62 | struct stat st; | |
63 | uint64_t quota_referenced; | |
64 | ||
65 | unsigned last_percent; | |
66 | RateLimit progress_rate_limit; | |
67 | ||
68 | bool eof; | |
69 | bool tried_splice; | |
70 | }; | |
71 | ||
72 | TarExport *tar_export_unref(TarExport *e) { | |
73 | if (!e) | |
74 | return NULL; | |
75 | ||
76 | sd_event_source_unref(e->output_event_source); | |
77 | ||
78 | if (e->tar_pid > 1) { | |
79 | (void) kill_and_sigcont(e->tar_pid, SIGKILL); | |
80 | (void) wait_for_terminate(e->tar_pid, NULL); | |
81 | } | |
82 | ||
83 | if (e->temp_path) { | |
5bcd08db | 84 | (void) btrfs_subvol_remove(e->temp_path, BTRFS_REMOVE_QUOTA); |
587fec42 LP |
85 | free(e->temp_path); |
86 | } | |
87 | ||
88 | import_compress_free(&e->compress); | |
89 | ||
90 | sd_event_unref(e->event); | |
91 | ||
92 | safe_close(e->tar_fd); | |
93 | ||
94 | free(e->buffer); | |
95 | free(e->path); | |
96 | free(e); | |
97 | ||
98 | return NULL; | |
99 | } | |
100 | ||
101 | int tar_export_new( | |
102 | TarExport **ret, | |
103 | sd_event *event, | |
104 | TarExportFinished on_finished, | |
105 | void *userdata) { | |
106 | ||
107 | _cleanup_(tar_export_unrefp) TarExport *e = NULL; | |
108 | int r; | |
109 | ||
110 | assert(ret); | |
111 | ||
112 | e = new0(TarExport, 1); | |
113 | if (!e) | |
114 | return -ENOMEM; | |
115 | ||
116 | e->output_fd = e->tar_fd = -1; | |
117 | e->on_finished = on_finished; | |
118 | e->userdata = userdata; | |
119 | e->quota_referenced = (uint64_t) -1; | |
120 | ||
121 | RATELIMIT_INIT(e->progress_rate_limit, 100 * USEC_PER_MSEC, 1); | |
122 | e->last_percent = (unsigned) -1; | |
123 | ||
124 | if (event) | |
125 | e->event = sd_event_ref(event); | |
126 | else { | |
127 | r = sd_event_default(&e->event); | |
128 | if (r < 0) | |
129 | return r; | |
130 | } | |
131 | ||
132 | *ret = e; | |
133 | e = NULL; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static void tar_export_report_progress(TarExport *e) { | |
139 | unsigned percent; | |
140 | assert(e); | |
141 | ||
e5f270f5 | 142 | /* Do we have any quota info? If not, we don't know anything about the progress */ |
587fec42 LP |
143 | if (e->quota_referenced == (uint64_t) -1) |
144 | return; | |
145 | ||
146 | if (e->written_uncompressed >= e->quota_referenced) | |
147 | percent = 100; | |
148 | else | |
149 | percent = (unsigned) ((e->written_uncompressed * UINT64_C(100)) / e->quota_referenced); | |
150 | ||
151 | if (percent == e->last_percent) | |
152 | return; | |
153 | ||
154 | if (!ratelimit_test(&e->progress_rate_limit)) | |
155 | return; | |
156 | ||
157 | sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); | |
158 | log_info("Exported %u%%.", percent); | |
159 | ||
160 | e->last_percent = percent; | |
161 | } | |
162 | ||
163 | static int tar_export_process(TarExport *e) { | |
164 | ssize_t l; | |
165 | int r; | |
166 | ||
167 | assert(e); | |
168 | ||
169 | if (!e->tried_splice && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) { | |
170 | ||
171 | l = splice(e->tar_fd, NULL, e->output_fd, NULL, COPY_BUFFER_SIZE, 0); | |
172 | if (l < 0) { | |
173 | if (errno == EAGAIN) | |
174 | return 0; | |
175 | ||
176 | e->tried_splice = true; | |
177 | } else if (l == 0) { | |
178 | r = 0; | |
179 | goto finish; | |
180 | } else { | |
181 | e->written_uncompressed += l; | |
182 | e->written_compressed += l; | |
183 | ||
184 | tar_export_report_progress(e); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | } | |
189 | ||
190 | while (e->buffer_size <= 0) { | |
191 | uint8_t input[COPY_BUFFER_SIZE]; | |
192 | ||
193 | if (e->eof) { | |
194 | r = 0; | |
195 | goto finish; | |
196 | } | |
197 | ||
198 | l = read(e->tar_fd, input, sizeof(input)); | |
199 | if (l < 0) { | |
200 | r = log_error_errno(errno, "Failed to read tar file: %m"); | |
201 | goto finish; | |
202 | } | |
203 | ||
204 | if (l == 0) { | |
205 | e->eof = true; | |
206 | r = import_compress_finish(&e->compress, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
207 | } else { | |
208 | e->written_uncompressed += l; | |
209 | r = import_compress(&e->compress, input, l, &e->buffer, &e->buffer_size, &e->buffer_allocated); | |
210 | } | |
211 | if (r < 0) { | |
212 | r = log_error_errno(r, "Failed to encode: %m"); | |
213 | goto finish; | |
214 | } | |
215 | } | |
216 | ||
217 | l = write(e->output_fd, e->buffer, e->buffer_size); | |
218 | if (l < 0) { | |
219 | if (errno == EAGAIN) | |
220 | return 0; | |
221 | ||
222 | r = log_error_errno(errno, "Failed to write output file: %m"); | |
223 | goto finish; | |
224 | } | |
225 | ||
226 | assert((size_t) l <= e->buffer_size); | |
227 | memmove(e->buffer, (uint8_t*) e->buffer + l, e->buffer_size - l); | |
228 | e->buffer_size -= l; | |
229 | e->written_compressed += l; | |
230 | ||
231 | tar_export_report_progress(e); | |
232 | ||
233 | return 0; | |
234 | ||
235 | finish: | |
236 | if (e->on_finished) | |
237 | e->on_finished(e, r, e->userdata); | |
238 | else | |
239 | sd_event_exit(e->event, r); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int tar_export_on_output(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
245 | TarExport *i = userdata; | |
246 | ||
247 | return tar_export_process(i); | |
248 | } | |
249 | ||
250 | static int tar_export_on_defer(sd_event_source *s, void *userdata) { | |
251 | TarExport *i = userdata; | |
252 | ||
253 | return tar_export_process(i); | |
254 | } | |
255 | ||
256 | int tar_export_start(TarExport *e, const char *path, int fd, ImportCompressType compress) { | |
257 | _cleanup_close_ int sfd = -1; | |
258 | int r; | |
259 | ||
260 | assert(e); | |
261 | assert(path); | |
262 | assert(fd >= 0); | |
263 | assert(compress < _IMPORT_COMPRESS_TYPE_MAX); | |
264 | assert(compress != IMPORT_COMPRESS_UNKNOWN); | |
265 | ||
266 | if (e->output_fd >= 0) | |
267 | return -EBUSY; | |
268 | ||
269 | sfd = open(path, O_DIRECTORY|O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
270 | if (sfd < 0) | |
271 | return -errno; | |
272 | ||
273 | if (fstat(sfd, &e->st) < 0) | |
274 | return -errno; | |
275 | ||
276 | r = fd_nonblock(fd, true); | |
277 | if (r < 0) | |
278 | return r; | |
279 | ||
280 | r = free_and_strdup(&e->path, path); | |
281 | if (r < 0) | |
282 | return r; | |
283 | ||
284 | e->quota_referenced = (uint64_t) -1; | |
285 | ||
286 | if (e->st.st_ino == 256) { /* might be a btrfs subvolume? */ | |
287 | BtrfsQuotaInfo q; | |
288 | ||
5bcd08db | 289 | r = btrfs_subvol_get_subtree_quota_fd(sfd, 0, &q); |
587fec42 | 290 | if (r >= 0) |
cb81cd80 | 291 | e->quota_referenced = q.referenced; |
587fec42 | 292 | |
a1e58e8e | 293 | e->temp_path = mfree(e->temp_path); |
587fec42 | 294 | |
14bcf25c | 295 | r = tempfn_random(path, NULL, &e->temp_path); |
587fec42 LP |
296 | if (r < 0) |
297 | return r; | |
298 | ||
299 | /* Let's try to make a snapshot, if we can, so that the export is atomic */ | |
f70a17f8 | 300 | r = btrfs_subvol_snapshot_fd(sfd, e->temp_path, BTRFS_SNAPSHOT_READ_ONLY|BTRFS_SNAPSHOT_RECURSIVE); |
587fec42 LP |
301 | if (r < 0) { |
302 | log_debug_errno(r, "Couldn't create snapshot %s of %s, not exporting atomically: %m", e->temp_path, path); | |
a1e58e8e | 303 | e->temp_path = mfree(e->temp_path); |
587fec42 LP |
304 | } |
305 | } | |
306 | ||
307 | r = import_compress_init(&e->compress, compress); | |
308 | if (r < 0) | |
309 | return r; | |
310 | ||
311 | r = sd_event_add_io(e->event, &e->output_event_source, fd, EPOLLOUT, tar_export_on_output, e); | |
312 | if (r == -EPERM) { | |
313 | r = sd_event_add_defer(e->event, &e->output_event_source, tar_export_on_defer, e); | |
314 | if (r < 0) | |
315 | return r; | |
316 | ||
317 | r = sd_event_source_set_enabled(e->output_event_source, SD_EVENT_ON); | |
318 | } | |
319 | if (r < 0) | |
320 | return r; | |
321 | ||
322 | e->tar_fd = import_fork_tar_c(e->temp_path ?: e->path, &e->tar_pid); | |
323 | if (e->tar_fd < 0) { | |
324 | e->output_event_source = sd_event_source_unref(e->output_event_source); | |
325 | return e->tar_fd; | |
326 | } | |
327 | ||
328 | e->output_fd = fd; | |
329 | return r; | |
330 | } |