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 "btrfs-util.h"
30 #include "export-raw.h"
32 #include "import-common.h"
33 #include "ratelimit.h"
34 #include "string-util.h"
37 #define COPY_BUFFER_SIZE (16*1024)
42 RawExportFinished on_finished
;
50 ImportCompress compress
;
52 sd_event_source
*output_event_source
;
56 size_t buffer_allocated
;
58 uint64_t written_compressed
;
59 uint64_t written_uncompressed
;
61 unsigned last_percent
;
62 RateLimit progress_rate_limit
;
71 RawExport
*raw_export_unref(RawExport
*e
) {
75 sd_event_source_unref(e
->output_event_source
);
77 import_compress_free(&e
->compress
);
79 sd_event_unref(e
->event
);
81 safe_close(e
->input_fd
);
93 RawExportFinished on_finished
,
96 _cleanup_(raw_export_unrefp
) RawExport
*e
= NULL
;
101 e
= new0(RawExport
, 1);
105 e
->output_fd
= e
->input_fd
= -1;
106 e
->on_finished
= on_finished
;
107 e
->userdata
= userdata
;
109 RATELIMIT_INIT(e
->progress_rate_limit
, 100 * USEC_PER_MSEC
, 1);
110 e
->last_percent
= (unsigned) -1;
113 e
->event
= sd_event_ref(event
);
115 r
= sd_event_default(&e
->event
);
126 static void raw_export_report_progress(RawExport
*e
) {
130 if (e
->written_uncompressed
>= (uint64_t) e
->st
.st_size
)
133 percent
= (unsigned) ((e
->written_uncompressed
* UINT64_C(100)) / (uint64_t) e
->st
.st_size
);
135 if (percent
== e
->last_percent
)
138 if (!ratelimit_test(&e
->progress_rate_limit
))
141 sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent
);
142 log_info("Exported %u%%.", percent
);
144 e
->last_percent
= percent
;
147 static int raw_export_process(RawExport
*e
) {
153 if (!e
->tried_reflink
&& e
->compress
.type
== IMPORT_COMPRESS_UNCOMPRESSED
) {
155 /* If we shall take an uncompressed snapshot we can
156 * reflink source to destination directly. Let's see
159 r
= btrfs_reflink(e
->input_fd
, e
->output_fd
);
165 e
->tried_reflink
= true;
168 if (!e
->tried_sendfile
&& e
->compress
.type
== IMPORT_COMPRESS_UNCOMPRESSED
) {
170 l
= sendfile(e
->output_fd
, e
->input_fd
, NULL
, COPY_BUFFER_SIZE
);
175 e
->tried_sendfile
= true;
180 e
->written_uncompressed
+= l
;
181 e
->written_compressed
+= l
;
183 raw_export_report_progress(e
);
189 while (e
->buffer_size
<= 0) {
190 uint8_t input
[COPY_BUFFER_SIZE
];
197 l
= read(e
->input_fd
, input
, sizeof(input
));
199 r
= log_error_errno(errno
, "Failed to read raw file: %m");
205 r
= import_compress_finish(&e
->compress
, &e
->buffer
, &e
->buffer_size
, &e
->buffer_allocated
);
207 e
->written_uncompressed
+= l
;
208 r
= import_compress(&e
->compress
, input
, l
, &e
->buffer
, &e
->buffer_size
, &e
->buffer_allocated
);
211 r
= log_error_errno(r
, "Failed to encode: %m");
216 l
= write(e
->output_fd
, e
->buffer
, e
->buffer_size
);
221 r
= log_error_errno(errno
, "Failed to write output file: %m");
225 assert((size_t) l
<= e
->buffer_size
);
226 memmove(e
->buffer
, (uint8_t*) e
->buffer
+ l
, e
->buffer_size
- l
);
228 e
->written_compressed
+= l
;
230 raw_export_report_progress(e
);
236 (void) copy_times(e
->input_fd
, e
->output_fd
);
237 (void) copy_xattr(e
->input_fd
, e
->output_fd
);
241 e
->on_finished(e
, r
, e
->userdata
);
243 sd_event_exit(e
->event
, r
);
248 static int raw_export_on_output(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
249 RawExport
*i
= userdata
;
251 return raw_export_process(i
);
254 static int raw_export_on_defer(sd_event_source
*s
, void *userdata
) {
255 RawExport
*i
= userdata
;
257 return raw_export_process(i
);
260 static int reflink_snapshot(int fd
, const char *path
) {
267 new_fd
= open(d
, O_TMPFILE
|O_CLOEXEC
|O_NOCTTY
|O_RDWR
, 0600);
269 _cleanup_free_
char *t
= NULL
;
271 r
= tempfn_random(path
, NULL
, &t
);
275 new_fd
= open(t
, O_CLOEXEC
|O_CREAT
|O_NOCTTY
|O_RDWR
, 0600);
282 r
= btrfs_reflink(fd
, new_fd
);
291 int raw_export_start(RawExport
*e
, const char *path
, int fd
, ImportCompressType compress
) {
292 _cleanup_close_
int sfd
= -1, tfd
= -1;
298 assert(compress
< _IMPORT_COMPRESS_TYPE_MAX
);
299 assert(compress
!= IMPORT_COMPRESS_UNKNOWN
);
301 if (e
->output_fd
>= 0)
304 r
= fd_nonblock(fd
, true);
308 r
= free_and_strdup(&e
->path
, path
);
312 sfd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
);
316 if (fstat(sfd
, &e
->st
) < 0)
318 if (!S_ISREG(e
->st
.st_mode
))
321 /* Try to take a reflink snapshot of the file, if we can t make the export atomic */
322 tfd
= reflink_snapshot(sfd
, path
);
331 r
= import_compress_init(&e
->compress
, compress
);
335 r
= sd_event_add_io(e
->event
, &e
->output_event_source
, fd
, EPOLLOUT
, raw_export_on_output
, e
);
337 r
= sd_event_add_defer(e
->event
, &e
->output_event_source
, raw_export_on_defer
, e
);
341 r
= sd_event_source_set_enabled(e
->output_event_source
, SD_EVENT_ON
);