+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2015 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <sys/sendfile.h>
-#include <libgen.h>
-#undef basename
-
-#include "sd-daemon.h"
-#include "util.h"
-#include "ratelimit.h"
-#include "btrfs-util.h"
-#include "copy.h"
-#include "import-common.h"
-#include "export-raw.h"
-
-#define COPY_BUFFER_SIZE (16*1024)
-
-struct RawExport {
- sd_event *event;
-
- RawExportFinished on_finished;
- void *userdata;
-
- char *path;
-
- int input_fd;
- int output_fd;
-
- ImportCompress compress;
-
- sd_event_source *output_event_source;
-
- void *buffer;
- size_t buffer_size;
- size_t buffer_allocated;
-
- uint64_t written_compressed;
- uint64_t written_uncompressed;
-
- unsigned last_percent;
- RateLimit progress_rate_limit;
-
- struct stat st;
-
- bool eof;
- bool tried_reflink;
- bool tried_sendfile;
-};
-
-RawExport *raw_export_unref(RawExport *e) {
- if (!e)
- return NULL;
-
- sd_event_source_unref(e->output_event_source);
-
- import_compress_free(&e->compress);
-
- sd_event_unref(e->event);
-
- safe_close(e->input_fd);
-
- free(e->buffer);
- free(e->path);
- free(e);
-
- return NULL;
-}
-
-int raw_export_new(
- RawExport **ret,
- sd_event *event,
- RawExportFinished on_finished,
- void *userdata) {
-
- _cleanup_(raw_export_unrefp) RawExport *e = NULL;
- int r;
-
- assert(ret);
-
- e = new0(RawExport, 1);
- if (!e)
- return -ENOMEM;
-
- e->output_fd = e->input_fd = -1;
- e->on_finished = on_finished;
- e->userdata = userdata;
-
- RATELIMIT_INIT(e->progress_rate_limit, 100 * USEC_PER_MSEC, 1);
- e->last_percent = (unsigned) -1;
-
- if (event)
- e->event = sd_event_ref(event);
- else {
- r = sd_event_default(&e->event);
- if (r < 0)
- return r;
- }
-
- *ret = e;
- e = NULL;
-
- return 0;
-}
-
-static void raw_export_report_progress(RawExport *e) {
- unsigned percent;
- assert(e);
-
- if (e->written_uncompressed >= (uint64_t) e->st.st_size)
- percent = 100;
- else
- percent = (unsigned) ((e->written_uncompressed * UINT64_C(100)) / (uint64_t) e->st.st_size);
-
- if (percent == e->last_percent)
- return;
-
- if (!ratelimit_test(&e->progress_rate_limit))
- return;
-
- sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
- log_info("Exported %u%%.", percent);
-
- e->last_percent = percent;
-}
-
-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;
-}
-
-static int raw_export_on_output(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
- RawExport *i = userdata;
-
- return raw_export_process(i);
-}
-
-static int raw_export_on_defer(sd_event_source *s, void *userdata) {
- RawExport *i = userdata;
-
- return raw_export_process(i);
-}
-
-static int reflink_snapshot(int fd, const char *path) {
- char *p, *d;
- int new_fd, r;
-
- p = strdupa(path);
- d = dirname(p);
-
- new_fd = open(d, O_TMPFILE|O_CLOEXEC|O_NOCTTY|O_RDWR, 0600);
- if (new_fd < 0) {
- _cleanup_free_ char *t = NULL;
-
- r = tempfn_random(path, &t);
- if (r < 0)
- return r;
-
- new_fd = open(t, O_CLOEXEC|O_CREAT|O_NOCTTY|O_RDWR, 0600);
- if (new_fd < 0)
- return -errno;
-
- (void) unlink(t);
- }
-
- r = btrfs_reflink(fd, new_fd);
- if (r < 0) {
- safe_close(new_fd);
- return r;
- }
-
- return new_fd;
-}
-
-int raw_export_start(RawExport *e, const char *path, int fd, ImportCompressType compress) {
- _cleanup_close_ int sfd = -1, tfd = -1;
- int r;
-
- assert(e);
- assert(path);
- assert(fd >= 0);
- assert(compress < _IMPORT_COMPRESS_TYPE_MAX);
- assert(compress != IMPORT_COMPRESS_UNKNOWN);
-
- if (e->output_fd >= 0)
- return -EBUSY;
-
- r = fd_nonblock(fd, true);
- if (r < 0)
- return r;
-
- r = free_and_strdup(&e->path, path);
- if (r < 0)
- return r;
-
- sfd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (sfd < 0)
- return -errno;
-
- if (fstat(sfd, &e->st) < 0)
- return -errno;
- if (!S_ISREG(e->st.st_mode))
- return -ENOTTY;
-
- /* Try to take a reflink snapshot of the file, if we can t make the export atomic */
- tfd = reflink_snapshot(sfd, path);
- if (tfd >= 0) {
- e->input_fd = tfd;
- tfd = -1;
- } else {
- e->input_fd = sfd;
- sfd = -1;
- }
-
- r = import_compress_init(&e->compress, compress);
- if (r < 0)
- return r;
-
- r = sd_event_add_io(e->event, &e->output_event_source, fd, EPOLLOUT, raw_export_on_output, e);
- if (r == -EPERM) {
- r = sd_event_add_defer(e->event, &e->output_event_source, raw_export_on_defer, e);
- if (r < 0)
- return r;
-
- r = sd_event_source_set_enabled(e->output_event_source, SD_EVENT_ON);
- }
- if (r < 0)
- return r;
-
- e->output_fd = fd;
- return r;
-}
~ianmdlvl / elogind.git / blobdiff