+++ /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 <linux/fs.h>
-
-#include "sd-daemon.h"
-#include "sd-event.h"
-#include "util.h"
-#include "path-util.h"
-#include "btrfs-util.h"
-#include "copy.h"
-#include "mkdir.h"
-#include "ratelimit.h"
-#include "machine-pool.h"
-#include "qcow2-util.h"
-#include "import-compress.h"
-#include "import-common.h"
-#include "import-raw.h"
-
-struct RawImport {
- sd_event *event;
-
- char *image_root;
-
- RawImportFinished on_finished;
- void *userdata;
-
- char *local;
- bool force_local;
- bool read_only;
- bool grow_machine_directory;
-
- char *temp_path;
- char *final_path;
-
- int input_fd;
- int output_fd;
-
- ImportCompress compress;
-
- uint64_t written_since_last_grow;
-
- sd_event_source *input_event_source;
-
- uint8_t buffer[16*1024];
- size_t buffer_size;
-
- uint64_t written_compressed;
- uint64_t written_uncompressed;
-
- struct stat st;
-
- unsigned last_percent;
- RateLimit progress_rate_limit;
-};
-
-RawImport* raw_import_unref(RawImport *i) {
- if (!i)
- return NULL;
-
- sd_event_unref(i->event);
-
- if (i->temp_path) {
- (void) unlink(i->temp_path);
- free(i->temp_path);
- }
-
- import_compress_free(&i->compress);
-
- sd_event_source_unref(i->input_event_source);
-
- safe_close(i->output_fd);
-
- free(i->final_path);
- free(i->image_root);
- free(i->local);
- free(i);
-
- return NULL;
-}
-
-int raw_import_new(
- RawImport **ret,
- sd_event *event,
- const char *image_root,
- RawImportFinished on_finished,
- void *userdata) {
-
- _cleanup_(raw_import_unrefp) RawImport *i = NULL;
- int r;
-
- assert(ret);
-
- i = new0(RawImport, 1);
- if (!i)
- return -ENOMEM;
-
- i->input_fd = i->output_fd = -1;
- i->on_finished = on_finished;
- i->userdata = userdata;
-
- RATELIMIT_INIT(i->progress_rate_limit, 100 * USEC_PER_MSEC, 1);
- i->last_percent = (unsigned) -1;
-
- i->image_root = strdup(image_root ?: "/var/lib/machines");
- if (!i->image_root)
- return -ENOMEM;
-
- i->grow_machine_directory = path_startswith(i->image_root, "/var/lib/machines");
-
- if (event)
- i->event = sd_event_ref(event);
- else {
- r = sd_event_default(&i->event);
- if (r < 0)
- return r;
- }
-
- *ret = i;
- i = NULL;
-
- return 0;
-}
-
-static void raw_import_report_progress(RawImport *i) {
- unsigned percent;
- assert(i);
-
- /* We have no size information, unless the source is a regular file */
- if (!S_ISREG(i->st.st_mode))
- return;
-
- if (i->written_compressed >= (uint64_t) i->st.st_size)
- percent = 100;
- else
- percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size);
-
- if (percent == i->last_percent)
- return;
-
- if (!ratelimit_test(&i->progress_rate_limit))
- return;
-
- sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
- log_info("Imported %u%%.", percent);
-
- i->last_percent = percent;
-}
-
-static int raw_import_maybe_convert_qcow2(RawImport *i) {
- _cleanup_close_ int converted_fd = -1;
- _cleanup_free_ char *t = NULL;
- int r;
-
- assert(i);
-
- r = qcow2_detect(i->output_fd);
- if (r < 0)
- return log_error_errno(r, "Failed to detect whether this is a QCOW2 image: %m");
- if (r == 0)
- return 0;
-
- /* This is a QCOW2 image, let's convert it */
- r = tempfn_random(i->final_path, &t);
- if (r < 0)
- return log_oom();
-
- converted_fd = open(t, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
- if (converted_fd < 0)
- return log_error_errno(errno, "Failed to create %s: %m", t);
-
- r = chattr_fd(converted_fd, true, FS_NOCOW_FL);
- if (r < 0)
- log_warning_errno(errno, "Failed to set file attributes on %s: %m", t);
-
- log_info("Unpacking QCOW2 file.");
-
- r = qcow2_convert(i->output_fd, converted_fd);
- if (r < 0) {
- unlink(t);
- return log_error_errno(r, "Failed to convert qcow2 image: %m");
- }
-
- (void) unlink(i->temp_path);
- free(i->temp_path);
- i->temp_path = t;
- t = NULL;
-
- safe_close(i->output_fd);
- i->output_fd = converted_fd;
- converted_fd = -1;
-
- return 1;
-}
-
-static int raw_import_finish(RawImport *i) {
- int r;
-
- assert(i);
- assert(i->output_fd >= 0);
- assert(i->temp_path);
- assert(i->final_path);
-
- /* In case this was a sparse file, make sure the file system is right */
- if (i->written_uncompressed > 0) {
- if (ftruncate(i->output_fd, i->written_uncompressed) < 0)
- return log_error_errno(errno, "Failed to truncate file: %m");
- }
-
- r = raw_import_maybe_convert_qcow2(i);
- if (r < 0)
- return r;
-
- if (S_ISREG(i->st.st_mode)) {
- (void) copy_times(i->input_fd, i->output_fd);
- (void) copy_xattr(i->input_fd, i->output_fd);
- }
-
- if (i->read_only) {
- r = import_make_read_only_fd(i->output_fd);
- if (r < 0)
- return r;
- }
-
- if (i->force_local) {
- (void) btrfs_subvol_remove(i->final_path);
- (void) rm_rf_dangerous(i->final_path, false, true, false);
- }
-
- r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path);
- if (r < 0)
- return log_error_errno(r, "Failed to move image into place: %m");
-
- free(i->temp_path);
- i->temp_path = NULL;
-
- return 0;
-}
-
-static int raw_import_open_disk(RawImport *i) {
- int r;
-
- assert(i);
-
- assert(!i->final_path);
- assert(!i->temp_path);
- assert(i->output_fd < 0);
-
- i->final_path = strjoin(i->image_root, "/", i->local, ".raw", NULL);
- if (!i->final_path)
- return log_oom();
-
- r = tempfn_random(i->final_path, &i->temp_path);
- if (r < 0)
- return log_oom();
-
- (void) mkdir_parents_label(i->temp_path, 0700);
-
- i->output_fd = open(i->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
- if (i->output_fd < 0)
- return log_error_errno(errno, "Failed to open destination %s: %m", i->temp_path);
-
- r = chattr_fd(i->output_fd, true, FS_NOCOW_FL);
- if (r < 0)
- log_warning_errno(errno, "Failed to set file attributes on %s: %m", i->temp_path);
-
- return 0;
-}
-
-static int raw_import_try_reflink(RawImport *i) {
- off_t p;
- int r;
-
- assert(i);
- assert(i->input_fd >= 0);
- assert(i->output_fd >= 0);
-
- if (i->compress.type != IMPORT_COMPRESS_UNCOMPRESSED)
- return 0;
-
- if (!S_ISREG(i->st.st_mode))
- return 0;
-
- p = lseek(i->input_fd, 0, SEEK_CUR);
- if (p == (off_t) -1)
- return log_error_errno(errno, "Failed to read file offset of input file: %m");
-
- /* Let's only try a btrfs reflink, if we are reading from the beginning of the file */
- if ((uint64_t) p != (uint64_t) i->buffer_size)
- return 0;
-
- r = btrfs_reflink(i->input_fd, i->output_fd);
- if (r >= 0)
- return 1;
-
- return 0;
-}
-
-static int raw_import_write(const void *p, size_t sz, void *userdata) {
- RawImport *i = userdata;
- ssize_t n;
-
- if (i->grow_machine_directory && i->written_since_last_grow >= GROW_INTERVAL_BYTES) {
- i->written_since_last_grow = 0;
- grow_machine_directory();
- }
-
- n = sparse_write(i->output_fd, p, sz, 64);
- if (n < 0)
- return -errno;
- if ((size_t) n < sz)
- return -EIO;
-
- i->written_uncompressed += sz;
- i->written_since_last_grow += sz;
-
- return 0;
-}
-
-static int raw_import_process(RawImport *i) {
- ssize_t l;
- int r;
-
- assert(i);
- assert(i->buffer_size < sizeof(i->buffer));
-
- l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size);
- if (l < 0) {
- if (errno == EAGAIN)
- return 0;
-
- r = log_error_errno(errno, "Failed to read input file: %m");
- goto finish;
- }
- if (l == 0) {
- if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
- log_error("Premature end of file: %m");
- r = -EIO;
- goto finish;
- }
-
- r = raw_import_finish(i);
- goto finish;
- }
-
- i->buffer_size += l;
-
- if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
- r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size);
- if (r < 0) {
- log_error("Failed to detect file compression: %m");
- goto finish;
- }
- if (r == 0) /* Need more data */
- return 0;
-
- r = raw_import_open_disk(i);
- if (r < 0)
- goto finish;
-
- r = raw_import_try_reflink(i);
- if (r < 0)
- goto finish;
- if (r > 0) {
- r = raw_import_finish(i);
- goto finish;
- }
- }
-
- r = import_uncompress(&i->compress, i->buffer, i->buffer_size, raw_import_write, i);
- if (r < 0) {
- log_error_errno(r, "Failed to decode and write: %m");
- goto finish;
- }
-
- i->written_compressed += i->buffer_size;
- i->buffer_size = 0;
-
- raw_import_report_progress(i);
-
- return 0;
-
-finish:
- if (i->on_finished)
- i->on_finished(i, r, i->userdata);
- else
- sd_event_exit(i->event, r);
-
- return 0;
-}
-
-static int raw_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
- RawImport *i = userdata;
-
- return raw_import_process(i);
-}
-
-static int raw_import_on_defer(sd_event_source *s, void *userdata) {
- RawImport *i = userdata;
-
- return raw_import_process(i);
-}
-
-int raw_import_start(RawImport *i, int fd, const char *local, bool force_local, bool read_only) {
- int r;
-
- assert(i);
- assert(fd >= 0);
- assert(local);
-
- if (!machine_name_is_valid(local))
- return -EINVAL;
-
- if (i->input_fd >= 0)
- return -EBUSY;
-
- r = fd_nonblock(fd, true);
- if (r < 0)
- return r;
-
- r = free_and_strdup(&i->local, local);
- if (r < 0)
- return r;
- i->force_local = force_local;
- i->read_only = read_only;
-
- if (fstat(fd, &i->st) < 0)
- return -errno;
-
- r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, raw_import_on_input, i);
- if (r == -EPERM) {
- /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */
- r = sd_event_add_defer(i->event, &i->input_event_source, raw_import_on_defer, i);
- if (r < 0)
- return r;
-
- r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON);
- }
- if (r < 0)
- return r;
-
- i->input_fd = fd;
- return r;
-}
~ianmdlvl / elogind.git / blobdiff