1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
3 #include <sys/sendfile.h>
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(). */
11 #include "sd-daemon.h"
13 #include "alloc-util.h"
14 #include "btrfs-util.h"
16 #include "export-raw.h"
19 #include "import-common.h"
20 #include "missing_fcntl.h"
21 #include "ratelimit.h"
22 #include "stat-util.h"
23 #include "string-util.h"
24 #include "tmpfile-util.h"
27 #define COPY_BUFFER_SIZE (16*1024)
32 RawExportFinished on_finished
;
40 ImportCompress compress
;
42 sd_event_source
*output_event_source
;
46 size_t buffer_allocated
;
48 uint64_t written_compressed
;
49 uint64_t written_uncompressed
;
51 unsigned last_percent
;
52 RateLimit progress_ratelimit
;
61 RawExport
*raw_export_unref(RawExport
*e
) {
65 sd_event_source_unref(e
->output_event_source
);
67 import_compress_free(&e
->compress
);
69 sd_event_unref(e
->event
);
71 safe_close(e
->input_fd
);
81 RawExportFinished on_finished
,
84 _cleanup_(raw_export_unrefp
) RawExport
*e
= NULL
;
89 e
= new(RawExport
, 1);
96 .on_finished
= on_finished
,
98 .last_percent
= UINT_MAX
,
99 .progress_ratelimit
= { 100 * USEC_PER_MSEC
, 1 },
103 e
->event
= sd_event_ref(event
);
105 r
= sd_event_default(&e
->event
);
115 static void raw_export_report_progress(RawExport
*e
) {
119 if (e
->written_uncompressed
>= (uint64_t) e
->st
.st_size
)
122 percent
= (unsigned) ((e
->written_uncompressed
* UINT64_C(100)) / (uint64_t) e
->st
.st_size
);
124 if (percent
== e
->last_percent
)
127 if (!ratelimit_below(&e
->progress_ratelimit
))
130 sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent
);
131 log_info("Exported %u%%.", percent
);
133 e
->last_percent
= percent
;
136 static int raw_export_process(RawExport
*e
) {
142 if (!e
->tried_reflink
&& e
->compress
.type
== IMPORT_COMPRESS_UNCOMPRESSED
) {
144 /* If we shall take an uncompressed snapshot we can
145 * reflink source to destination directly. Let's see
148 r
= btrfs_reflink(e
->input_fd
, e
->output_fd
);
154 e
->tried_reflink
= true;
157 if (!e
->tried_sendfile
&& e
->compress
.type
== IMPORT_COMPRESS_UNCOMPRESSED
) {
159 l
= sendfile(e
->output_fd
, e
->input_fd
, NULL
, COPY_BUFFER_SIZE
);
164 e
->tried_sendfile
= true;
169 e
->written_uncompressed
+= l
;
170 e
->written_compressed
+= l
;
172 raw_export_report_progress(e
);
178 while (e
->buffer_size
<= 0) {
179 uint8_t input
[COPY_BUFFER_SIZE
];
186 l
= read(e
->input_fd
, input
, sizeof(input
));
188 r
= log_error_errno(errno
, "Failed to read raw file: %m");
194 r
= import_compress_finish(&e
->compress
, &e
->buffer
, &e
->buffer_size
, &e
->buffer_allocated
);
196 e
->written_uncompressed
+= l
;
197 r
= import_compress(&e
->compress
, input
, l
, &e
->buffer
, &e
->buffer_size
, &e
->buffer_allocated
);
200 r
= log_error_errno(r
, "Failed to encode: %m");
205 l
= write(e
->output_fd
, e
->buffer
, e
->buffer_size
);
210 r
= log_error_errno(errno
, "Failed to write output file: %m");
214 assert((size_t) l
<= e
->buffer_size
);
215 memmove(e
->buffer
, (uint8_t*) e
->buffer
+ l
, e
->buffer_size
- l
);
217 e
->written_compressed
+= l
;
219 raw_export_report_progress(e
);
225 (void) copy_times(e
->input_fd
, e
->output_fd
, COPY_CRTIME
);
226 (void) copy_xattr(e
->input_fd
, e
->output_fd
);
230 e
->on_finished(e
, r
, e
->userdata
);
232 sd_event_exit(e
->event
, r
);
237 static int raw_export_on_output(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
238 RawExport
*i
= userdata
;
240 return raw_export_process(i
);
243 static int raw_export_on_defer(sd_event_source
*s
, void *userdata
) {
244 RawExport
*i
= userdata
;
246 return raw_export_process(i
);
249 static int reflink_snapshot(int fd
, const char *path
) {
252 new_fd
= open_parent(path
, O_TMPFILE
|O_CLOEXEC
|O_RDWR
, 0600);
254 _cleanup_free_
char *t
= NULL
;
256 r
= tempfn_random(path
, NULL
, &t
);
260 new_fd
= open(t
, O_CLOEXEC
|O_CREAT
|O_NOCTTY
|O_RDWR
, 0600);
267 r
= btrfs_reflink(fd
, new_fd
);
276 int raw_export_start(RawExport
*e
, const char *path
, int fd
, ImportCompressType compress
) {
277 _cleanup_close_
int sfd
= -1, tfd
= -1;
283 assert(compress
< _IMPORT_COMPRESS_TYPE_MAX
);
284 assert(compress
!= IMPORT_COMPRESS_UNKNOWN
);
286 if (e
->output_fd
>= 0)
289 r
= fd_nonblock(fd
, true);
293 r
= free_and_strdup(&e
->path
, path
);
297 sfd
= open(path
, O_RDONLY
|O_CLOEXEC
|O_NOCTTY
);
301 if (fstat(sfd
, &e
->st
) < 0)
303 r
= stat_verify_regular(&e
->st
);
307 /* Try to take a reflink snapshot of the file, if we can t make the export atomic */
308 tfd
= reflink_snapshot(sfd
, path
);
310 e
->input_fd
= TAKE_FD(tfd
);
312 e
->input_fd
= TAKE_FD(sfd
);
314 r
= import_compress_init(&e
->compress
, compress
);
318 r
= sd_event_add_io(e
->event
, &e
->output_event_source
, fd
, EPOLLOUT
, raw_export_on_output
, e
);
320 r
= sd_event_add_defer(e
->event
, &e
->output_event_source
, raw_export_on_defer
, e
);
324 r
= sd_event_source_set_enabled(e
->output_event_source
, SD_EVENT_ON
);