diff options
Diffstat (limited to 'src/import/import-raw.c')
| -rw-r--r-- | src/import/import-raw.c | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/src/import/import-raw.c b/src/import/import-raw.c new file mode 100644 index 0000000000..15e5eb2ca2 --- /dev/null +++ b/src/import/import-raw.c @@ -0,0 +1,454 @@ +/*-*- 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, 500 * 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); + } + + if (renameat2(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path, RENAME_NOREPLACE) < 0) + return log_error_errno(errno, "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) { + 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 = 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; +} |