static int tar_export_process(TarExport *e) {
ssize_t l;
int r;
assert(e);
if (!e->tried_splice && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) {
l = splice(e->tar_fd, NULL, e->output_fd, NULL, COPY_BUFFER_SIZE, 0);
if (l < 0) {
if (errno == EAGAIN)
return 0;
e->tried_splice = true;
} else if (l == 0) {
r = 0;
goto finish;
} else {
e->written_uncompressed += l;
e->written_compressed += l;
tar_export_report_progress(e);
return 0;
}
}
while (e->buffer_size <= 0) {
uint8_t input[COPY_BUFFER_SIZE];
if (e->eof) {
r = 0;
goto finish;
}
l = read(e->tar_fd, input, sizeof(input));
if (l < 0) {
r = log_error_errno(errno, "Failed to read tar file: %m");
goto finish;
}
if (l == 0) {
e->eof = true;
r = import_compress_finish(&e->compress, &e->buffer, &e->buffer_size, &e->buffer_allocated);
} else {
e->written_uncompressed += l;
r = import_compress(&e->compress, input, l, &e->buffer, &e->buffer_size, &e->buffer_allocated);
}
if (r < 0) {
r = log_error_errno(r, "Failed to encode: %m");
goto finish;
}
}
l = write(e->output_fd, e->buffer, e->buffer_size);
if (l < 0) {
if (errno == EAGAIN)
return 0;
r = log_error_errno(errno, "Failed to write output file: %m");
goto finish;
}
assert((size_t) l <= e->buffer_size);
memmove(e->buffer, (uint8_t*) e->buffer + l, e->buffer_size - l);
e->buffer_size -= l;
e->written_compressed += l;
tar_export_report_progress(e);
return 0;
finish:
if (e->on_finished)
e->on_finished(e, r, e->userdata);
else
sd_event_exit(e->event, r);
return 0;
}
static int raw_export_process(RawExport *e) {
ssize_t l;
int r;
assert(e);
if (!e->tried_reflink && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) {
/* If we shall take an uncompressed snapshot we can
* reflink source to destination directly. Let's see
* if this works. */
r = btrfs_reflink(e->input_fd, e->output_fd);
if (r >= 0) {
r = 0;
goto finish;
}
e->tried_reflink = true;
}
if (!e->tried_sendfile && e->compress.type == IMPORT_COMPRESS_UNCOMPRESSED) {
l = sendfile(e->output_fd, e->input_fd, NULL, COPY_BUFFER_SIZE);
if (l < 0) {
if (errno == EAGAIN)
return 0;
e->tried_sendfile = true;
} else if (l == 0) {
r = 0;
goto finish;
} else {
e->written_uncompressed += l;
e->written_compressed += l;
raw_export_report_progress(e);
return 0;
}
}
while (e->buffer_size <= 0) {
uint8_t input[COPY_BUFFER_SIZE];
if (e->eof) {
r = 0;
goto finish;
}
l = read(e->input_fd, input, sizeof(input));
if (l < 0) {
r = log_error_errno(errno, "Failed to read raw file: %m");
goto finish;
}
if (l == 0) {
e->eof = true;
r = import_compress_finish(&e->compress, &e->buffer, &e->buffer_size, &e->buffer_allocated);
} else {
e->written_uncompressed += l;
r = import_compress(&e->compress, input, l, &e->buffer, &e->buffer_size, &e->buffer_allocated);
}
if (r < 0) {
r = log_error_errno(r, "Failed to encode: %m");
goto finish;
}
}
l = write(e->output_fd, e->buffer, e->buffer_size);
if (l < 0) {
if (errno == EAGAIN)
return 0;
r = log_error_errno(errno, "Failed to write output file: %m");
goto finish;
}
assert((size_t) l <= e->buffer_size);
memmove(e->buffer, (uint8_t*) e->buffer + l, e->buffer_size - l);
e->buffer_size -= l;
e->written_compressed += l;
raw_export_report_progress(e);
return 0;
finish:
if (r >= 0) {
(void) copy_times(e->input_fd, e->output_fd);
(void) copy_xattr(e->input_fd, e->output_fd);
}
if (e->on_finished)
e->on_finished(e, r, e->userdata);
else
sd_event_exit(e->event, r);
return 0;
}