579afbea21
Fixes: Message: Process 806 (systemd-importd) of user 0 dumped core. Stack trace of thread 806: #0 0x00007f5eaeff7227 raise (libc.so.6) #1 0x00007f5eaeff8e8a abort (libc.so.6) #2 0x000055b6d3418f4f log_assert_failed (systemd-importd) #3 0x000055b6d3409daf safe_close (systemd-importd) #4 0x000055b6d33c25ea closep (systemd-importd) #5 0x000055b6d33c38d9 setup_machine_directory (systemd-importd) #6 0x000055b6d33b8536 method_pull_tar_or_raw (systemd-importd) #7 0x000055b6d33ed097 method_callbacks_run (systemd-importd) #8 0x000055b6d33ef929 object_find_and_run (systemd-importd) #9 0x000055b6d33eff6b bus_process_object (systemd-importd) #10 0x000055b6d3447f77 process_message (systemd-importd) #11 0x000055b6d344815a process_running (systemd-importd) #12 0x000055b6d3448a10 bus_process_internal (systemd-importd) #13 0x000055b6d3448ae1 sd_bus_process (systemd-importd) #14 0x000055b6d3449779 time_callback (systemd-importd) #15 0x000055b6d3454ff4 source_dispatch (systemd-importd) #16 0x000055b6d34562b9 sd_event_dispatch (systemd-importd) #17 0x000055b6d34566f8 sd_event_run (systemd-importd) #18 0x000055b6d33ba72a bus_event_loop_with_idle (systemd-importd) #19 0x000055b6d33b95bc manager_run (systemd-importd) #20 0x000055b6d33b9766 main (systemd-importd) #21 0x00007f5eaefe2a00 __libc_start_main (libc.so.6) #22 0x000055b6d33b5569 _start (systemd-importd)
427 lines
14 KiB
C
427 lines
14 KiB
C
/***
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This file is part of systemd.
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Copyright 2015 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/loop.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/prctl.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <sys/statvfs.h>
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#include <unistd.h>
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#include "sd-bus-protocol.h"
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#include "sd-bus.h"
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#include "alloc-util.h"
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#include "btrfs-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "lockfile-util.h"
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#include "log.h"
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#include "machine-pool.h"
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#include "macro.h"
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#include "missing.h"
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#include "mkdir.h"
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#include "mount-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "signal-util.h"
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#include "stat-util.h"
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#include "string-util.h"
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#define VAR_LIB_MACHINES_SIZE_START (1024UL*1024UL*500UL)
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#define VAR_LIB_MACHINES_FREE_MIN (1024UL*1024UL*750UL)
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static int check_btrfs(void) {
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struct statfs sfs;
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if (statfs("/var/lib/machines", &sfs) < 0) {
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if (errno != ENOENT)
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return -errno;
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if (statfs("/var/lib", &sfs) < 0)
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return -errno;
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}
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return F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC);
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}
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static int setup_machine_raw(uint64_t size, sd_bus_error *error) {
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_cleanup_free_ char *tmp = NULL;
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_cleanup_close_ int fd = -1;
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struct statvfs ss;
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pid_t pid = 0;
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siginfo_t si;
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int r;
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/* We want to be able to make use of btrfs-specific file
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* system features, in particular subvolumes, reflinks and
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* quota. Hence, if we detect that /var/lib/machines.raw is
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* not located on btrfs, let's create a loopback file, place a
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* btrfs file system into it, and mount it to
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* /var/lib/machines. */
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fd = open("/var/lib/machines.raw", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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if (fd >= 0) {
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r = fd;
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fd = -1;
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return r;
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}
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if (errno != ENOENT)
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return sd_bus_error_set_errnof(error, errno, "Failed to open /var/lib/machines.raw: %m");
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r = tempfn_xxxxxx("/var/lib/machines.raw", NULL, &tmp);
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if (r < 0)
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return r;
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(void) mkdir_p_label("/var/lib", 0755);
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fd = open(tmp, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0600);
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if (fd < 0)
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return sd_bus_error_set_errnof(error, errno, "Failed to create /var/lib/machines.raw: %m");
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if (fstatvfs(fd, &ss) < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to determine free space on /var/lib/machines.raw: %m");
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goto fail;
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}
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if (ss.f_bsize * ss.f_bavail < VAR_LIB_MACHINES_FREE_MIN) {
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r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Not enough free disk space to set up /var/lib/machines.");
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goto fail;
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}
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if (ftruncate(fd, size) < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to enlarge /var/lib/machines.raw: %m");
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goto fail;
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}
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pid = fork();
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if (pid < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to fork mkfs.btrfs: %m");
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goto fail;
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}
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if (pid == 0) {
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/* Child */
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(void) reset_all_signal_handlers();
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(void) reset_signal_mask();
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assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
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fd = safe_close(fd);
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execlp("mkfs.btrfs", "-Lvar-lib-machines", tmp, NULL);
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if (errno == ENOENT)
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_exit(99);
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_exit(EXIT_FAILURE);
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}
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r = wait_for_terminate(pid, &si);
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if (r < 0) {
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sd_bus_error_set_errnof(error, r, "Failed to wait for mkfs.btrfs: %m");
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goto fail;
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}
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pid = 0;
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if (si.si_code != CLD_EXITED) {
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r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "mkfs.btrfs died abnormally.");
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goto fail;
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}
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if (si.si_status == 99) {
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r = sd_bus_error_set_errnof(error, ENOENT, "Cannot set up /var/lib/machines, mkfs.btrfs is missing");
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goto fail;
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}
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if (si.si_status != 0) {
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r = sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "mkfs.btrfs failed with error code %i", si.si_status);
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goto fail;
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}
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r = rename_noreplace(AT_FDCWD, tmp, AT_FDCWD, "/var/lib/machines.raw");
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if (r < 0) {
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sd_bus_error_set_errnof(error, r, "Failed to move /var/lib/machines.raw into place: %m");
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goto fail;
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}
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r = fd;
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fd = -1;
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return r;
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fail:
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unlink_noerrno(tmp);
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if (pid > 1)
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kill_and_sigcont(pid, SIGKILL);
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return r;
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}
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int setup_machine_directory(uint64_t size, sd_bus_error *error) {
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_cleanup_release_lock_file_ LockFile lock_file = LOCK_FILE_INIT;
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struct loop_info64 info = {
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.lo_flags = LO_FLAGS_AUTOCLEAR,
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};
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_cleanup_close_ int fd = -1, control = -1, loop = -1;
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_cleanup_free_ char* loopdev = NULL;
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char tmpdir[] = "/tmp/machine-pool.XXXXXX", *mntdir = NULL;
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bool tmpdir_made = false, mntdir_made = false, mntdir_mounted = false;
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char buf[FORMAT_BYTES_MAX];
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int r, nr = -1;
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/* btrfs cannot handle file systems < 16M, hence use this as minimum */
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if (size == (uint64_t) -1)
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size = VAR_LIB_MACHINES_SIZE_START;
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else if (size < 16*1024*1024)
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size = 16*1024*1024;
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/* Make sure we only set the directory up once at a time */
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r = make_lock_file("/run/systemd/machines.lock", LOCK_EX, &lock_file);
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if (r < 0)
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return r;
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r = check_btrfs();
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if (r < 0)
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return sd_bus_error_set_errnof(error, r, "Failed to determine whether /var/lib/machines is located on btrfs: %m");
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if (r > 0) {
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(void) btrfs_subvol_make_label("/var/lib/machines");
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r = btrfs_quota_enable("/var/lib/machines", true);
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if (r < 0)
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log_warning_errno(r, "Failed to enable quota for /var/lib/machines, ignoring: %m");
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r = btrfs_subvol_auto_qgroup("/var/lib/machines", 0, true);
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if (r < 0)
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log_warning_errno(r, "Failed to set up default quota hierarchy for /var/lib/machines, ignoring: %m");
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return 1;
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}
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if (path_is_mount_point("/var/lib/machines", AT_SYMLINK_FOLLOW) > 0) {
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log_debug("/var/lib/machines is already a mount point, not creating loopback file for it.");
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return 0;
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}
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r = dir_is_populated("/var/lib/machines");
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if (r < 0 && r != -ENOENT)
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return r;
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if (r > 0) {
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log_debug("/var/log/machines is already populated, not creating loopback file for it.");
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return 0;
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}
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r = mkfs_exists("btrfs");
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if (r == 0)
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return sd_bus_error_set_errnof(error, ENOENT, "Cannot set up /var/lib/machines, mkfs.btrfs is missing");
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if (r < 0)
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return r;
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fd = setup_machine_raw(size, error);
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if (fd < 0)
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return fd;
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control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
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if (control < 0)
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return sd_bus_error_set_errnof(error, errno, "Failed to open /dev/loop-control: %m");
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nr = ioctl(control, LOOP_CTL_GET_FREE);
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if (nr < 0)
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return sd_bus_error_set_errnof(error, errno, "Failed to allocate loop device: %m");
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if (asprintf(&loopdev, "/dev/loop%i", nr) < 0) {
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r = -ENOMEM;
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goto fail;
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}
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loop = open(loopdev, O_CLOEXEC|O_RDWR|O_NOCTTY|O_NONBLOCK);
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if (loop < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to open loopback device: %m");
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goto fail;
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}
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if (ioctl(loop, LOOP_SET_FD, fd) < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to bind loopback device: %m");
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goto fail;
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}
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if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to enable auto-clear for loopback device: %m");
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goto fail;
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}
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/* We need to make sure the new /var/lib/machines directory
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* has an access mode of 0700 at the time it is first made
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* available. mkfs will create it with 0755 however. Hence,
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* let's mount the directory into an inaccessible directory
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* below /tmp first, fix the access mode, and move it to the
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* public place then. */
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if (!mkdtemp(tmpdir)) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to create temporary mount parent directory: %m");
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goto fail;
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}
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tmpdir_made = true;
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mntdir = strjoina(tmpdir, "/mnt");
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if (mkdir(mntdir, 0700) < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to create temporary mount directory: %m");
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goto fail;
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}
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mntdir_made = true;
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if (mount(loopdev, mntdir, "btrfs", 0, NULL) < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to mount loopback device: %m");
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goto fail;
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}
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mntdir_mounted = true;
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r = btrfs_quota_enable(mntdir, true);
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if (r < 0)
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log_warning_errno(r, "Failed to enable quota, ignoring: %m");
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r = btrfs_subvol_auto_qgroup(mntdir, 0, true);
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if (r < 0)
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log_warning_errno(r, "Failed to set up default quota hierarchy, ignoring: %m");
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if (chmod(mntdir, 0700) < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to fix owner: %m");
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goto fail;
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}
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(void) mkdir_p_label("/var/lib/machines", 0700);
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if (mount(mntdir, "/var/lib/machines", NULL, MS_BIND, NULL) < 0) {
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r = sd_bus_error_set_errnof(error, errno, "Failed to mount directory into right place: %m");
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goto fail;
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}
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(void) syncfs(fd);
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log_info("Set up /var/lib/machines as btrfs loopback file system of size %s mounted on /var/lib/machines.raw.", format_bytes(buf, sizeof(buf), size));
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(void) umount2(mntdir, MNT_DETACH);
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(void) rmdir(mntdir);
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(void) rmdir(tmpdir);
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return 1;
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fail:
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if (mntdir_mounted)
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(void) umount2(mntdir, MNT_DETACH);
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if (mntdir_made)
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(void) rmdir(mntdir);
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if (tmpdir_made)
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(void) rmdir(tmpdir);
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if (loop >= 0) {
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(void) ioctl(loop, LOOP_CLR_FD);
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loop = safe_close(loop);
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}
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if (control >= 0 && nr >= 0)
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(void) ioctl(control, LOOP_CTL_REMOVE, nr);
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return r;
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}
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static int sync_path(const char *p) {
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_cleanup_close_ int fd = -1;
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fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY);
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if (fd < 0)
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return -errno;
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if (syncfs(fd) < 0)
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return -errno;
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return 0;
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}
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int grow_machine_directory(void) {
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char buf[FORMAT_BYTES_MAX];
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struct statvfs a, b;
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uint64_t old_size, new_size, max_add;
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int r;
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/* Ensure the disk space data is accurate */
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sync_path("/var/lib/machines");
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sync_path("/var/lib/machines.raw");
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if (statvfs("/var/lib/machines.raw", &a) < 0)
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return -errno;
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if (statvfs("/var/lib/machines", &b) < 0)
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return -errno;
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/* Don't grow if not enough disk space is available on the host */
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if (((uint64_t) a.f_bavail * (uint64_t) a.f_bsize) <= VAR_LIB_MACHINES_FREE_MIN)
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return 0;
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/* Don't grow if at least 1/3th of the fs is still free */
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if (b.f_bavail > b.f_blocks / 3)
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return 0;
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/* Calculate how much we are willing to add at most */
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max_add = ((uint64_t) a.f_bavail * (uint64_t) a.f_bsize) - VAR_LIB_MACHINES_FREE_MIN;
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/* Calculate the old size */
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old_size = (uint64_t) b.f_blocks * (uint64_t) b.f_bsize;
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/* Calculate the new size as three times the size of what is used right now */
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new_size = ((uint64_t) b.f_blocks - (uint64_t) b.f_bavail) * (uint64_t) b.f_bsize * 3;
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/* Always, grow at least to the start size */
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if (new_size < VAR_LIB_MACHINES_SIZE_START)
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new_size = VAR_LIB_MACHINES_SIZE_START;
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/* If the new size is smaller than the old size, don't grow */
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if (new_size < old_size)
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return 0;
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/* Ensure we never add more than the maximum */
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if (new_size > old_size + max_add)
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new_size = old_size + max_add;
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r = btrfs_resize_loopback("/var/lib/machines", new_size, true);
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if (r <= 0)
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return r;
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/* Also bump the quota, of both the subvolume leaf qgroup, as
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* well as of any subtree quota group by the same id but a
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* higher level, if it exists. */
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(void) btrfs_qgroup_set_limit("/var/lib/machines", 0, new_size);
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(void) btrfs_subvol_set_subtree_quota_limit("/var/lib/machines", 0, new_size);
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log_info("Grew /var/lib/machines btrfs loopback file system to %s.", format_bytes(buf, sizeof(buf), new_size));
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return 1;
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}
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