1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2015 Lennart Poettering
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.
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.
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/>.
22 #include <sys/sendfile.h>
26 #include "sd-daemon.h"
28 #include "ratelimit.h"
29 #include "btrfs-util.h"
31 #include "import-common.h"
32 #include "export-raw.h"
34 #define COPY_BUFFER_SIZE (16*1024)
39 RawExportFinished on_finished;
47 ImportCompress compress;
49 sd_event_source *output_event_source;
53 size_t buffer_allocated;
55 uint64_t written_compressed;
56 uint64_t written_uncompressed;
58 unsigned last_percent;
59 RateLimit progress_rate_limit;
68 RawExport *raw_export_unref(RawExport *e) {
72 sd_event_source_unref(e->output_event_source);
74 import_compress_free(&e->compress);
76 sd_event_unref(e->event);
78 safe_close(e->input_fd);
90 RawExportFinished on_finished,
93 _cleanup_(raw_export_unrefp) RawExport *e = NULL;
98 e = new0(RawExport, 1);
102 e->output_fd = e->input_fd = -1;
103 e->on_finished = on_finished;
104 e->userdata = userdata;
106 RATELIMIT_INIT(e->progress_rate_limit, 100 * USEC_PER_MSEC, 1);
107 e->last_percent = (unsigned) -1;
110 e->event = sd_event_ref(event);
112 r = sd_event_default(&e->event);
123 static void raw_export_report_progress(RawExport *e) {
127 if (e->written_uncompressed >= (uint64_t) e->st.st_size)
130 percent = (unsigned) ((e->written_uncompressed * UINT64_C(100)) / (uint64_t) e->st.st_size);
132 if (percent == e->last_percent)
135 if (!ratelimit_test(&e->progress_rate_limit))
138 sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
139 log_info("Exported %u%%.", percent);
141 e->last_percent = percent;
144 static int raw_export_process(RawExport *e) {
150 if (!e->tried_reflink && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) {
152 /* If we shall take an uncompressed snapshot we can
153 * reflink source to destination directly. Let's see
156 r = btrfs_reflink(e->input_fd, e->output_fd);
162 e->tried_reflink = true;
165 if (!e->tried_sendfile && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) {
167 l = sendfile(e->output_fd, e->input_fd, NULL, COPY_BUFFER_SIZE);
172 e->tried_sendfile = true;
177 e->written_uncompressed += l;
178 e->written_compressed += l;
180 raw_export_report_progress(e);
186 while (e->buffer_size <= 0) {
187 uint8_t input[COPY_BUFFER_SIZE];
194 l = read(e->input_fd, input, sizeof(input));
196 r = log_error_errno(errno, "Failed to read raw file: %m");
202 r = import_compress_finish(&e->compress, &e->buffer, &e->buffer_size, &e->buffer_allocated);
204 e->written_uncompressed += l;
205 r = import_compress(&e->compress, input, l, &e->buffer, &e->buffer_size, &e->buffer_allocated);
208 r = log_error_errno(r, "Failed to encode: %m");
213 l = write(e->output_fd, e->buffer, e->buffer_size);
218 r = log_error_errno(errno, "Failed to write output file: %m");
222 assert((size_t) l <= e->buffer_size);
223 memmove(e->buffer, (uint8_t*) e->buffer + l, e->buffer_size - l);
225 e->written_compressed += l;
227 raw_export_report_progress(e);
233 (void) copy_times(e->input_fd, e->output_fd);
234 (void) copy_xattr(e->input_fd, e->output_fd);
238 e->on_finished(e, r, e->userdata);
240 sd_event_exit(e->event, r);
245 static int raw_export_on_output(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
246 RawExport *i = userdata;
248 return raw_export_process(i);
251 static int raw_export_on_defer(sd_event_source *s, void *userdata) {
252 RawExport *i = userdata;
254 return raw_export_process(i);
257 static int reflink_snapshot(int fd, const char *path) {
264 new_fd = open(d, O_TMPFILE|O_CLOEXEC|O_NOCTTY|O_RDWR, 0600);
266 _cleanup_free_ char *t = NULL;
268 r = tempfn_random(path, &t);
272 new_fd = open(t, O_CLOEXEC|O_CREAT|O_NOCTTY|O_RDWR, 0600);
279 r = btrfs_reflink(fd, new_fd);
288 int raw_export_start(RawExport *e, const char *path, int fd, ImportCompressType compress) {
289 _cleanup_close_ int sfd = -1, tfd = -1;
295 assert(compress < _IMPORT_COMPRESS_TYPE_MAX);
296 assert(compress != IMPORT_COMPRESS_UNKNOWN);
298 if (e->output_fd >= 0)
301 r = fd_nonblock(fd, true);
305 r = free_and_strdup(&e->path, path);
309 sfd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY);
313 if (fstat(sfd, &e->st) < 0)
315 if (!S_ISREG(e->st.st_mode))
318 /* Try to take a reflink snapshot of the file, if we can t make the export atomic */
319 tfd = reflink_snapshot(sfd, path);
328 r = import_compress_init(&e->compress, compress);
332 r = sd_event_add_io(e->event, &e->output_event_source, fd, EPOLLOUT, raw_export_on_output, e);
334 r = sd_event_add_defer(e->event, &e->output_event_source, raw_export_on_defer, e);
338 r = sd_event_source_set_enabled(e->output_event_source, SD_EVENT_ON);