170 lines
4.3 KiB
C
170 lines
4.3 KiB
C
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/*
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* QEMU Guest Agent BSD-specific command implementations
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*
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* Copyright (c) Virtuozzo International GmbH.
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*
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* Authors:
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* Alexander Ivanov <alexander.ivanov@virtuozzo.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qga-qapi-commands.h"
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#include "qapi/qmp/qerror.h"
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#include "qapi/error.h"
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#include "qemu/queue.h"
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#include "commands-common.h"
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/ucred.h>
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#include <sys/mount.h>
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#include <paths.h>
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#if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
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bool build_fs_mount_list(FsMountList *mounts, Error **errp)
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{
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FsMount *mount;
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struct statfs *mntbuf, *mntp;
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struct stat statbuf;
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int i, count, ret;
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count = getmntinfo(&mntbuf, MNT_NOWAIT);
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if (count == 0) {
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error_setg_errno(errp, errno, "getmntinfo failed");
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return false;
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}
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for (i = 0; i < count; i++) {
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mntp = &mntbuf[i];
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ret = stat(mntp->f_mntonname, &statbuf);
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if (ret != 0) {
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error_setg_errno(errp, errno, "stat failed on %s",
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mntp->f_mntonname);
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return false;
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}
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mount = g_new0(FsMount, 1);
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mount->dirname = g_strdup(mntp->f_mntonname);
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mount->devtype = g_strdup(mntp->f_fstypename);
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mount->devmajor = major(mount->dev);
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mount->devminor = minor(mount->dev);
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mount->fsid = mntp->f_fsid;
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mount->dev = statbuf.st_dev;
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QTAILQ_INSERT_TAIL(mounts, mount, next);
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}
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return true;
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}
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#endif /* CONFIG_FSFREEZE || CONFIG_FSTRIM */
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#if defined(CONFIG_FSFREEZE)
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static int ufssuspend_fd = -1;
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static int ufssuspend_cnt;
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int64_t qmp_guest_fsfreeze_do_freeze_list(bool has_mountpoints,
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strList *mountpoints,
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FsMountList mounts,
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Error **errp)
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{
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int ret;
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strList *list;
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struct FsMount *mount;
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if (ufssuspend_fd != -1) {
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error_setg(errp, "filesystems have already frozen");
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return -1;
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}
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ufssuspend_cnt = 0;
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ufssuspend_fd = qemu_open(_PATH_UFSSUSPEND, O_RDWR, errp);
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if (ufssuspend_fd == -1) {
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return -1;
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}
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QTAILQ_FOREACH_REVERSE(mount, &mounts, next) {
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/*
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* To issue fsfreeze in the reverse order of mounts, check if the
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* mount is listed in the list here
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*/
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if (has_mountpoints) {
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for (list = mountpoints; list; list = list->next) {
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if (g_str_equal(list->value, mount->dirname)) {
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break;
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}
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}
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if (!list) {
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continue;
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}
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}
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/* Only UFS supports suspend */
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if (!g_str_equal(mount->devtype, "ufs")) {
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continue;
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}
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ret = ioctl(ufssuspend_fd, UFSSUSPEND, &mount->fsid);
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if (ret == -1) {
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/*
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* ioctl returns EBUSY for all the FS except the first one
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* that was suspended
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*/
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if (errno == EBUSY) {
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continue;
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}
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error_setg_errno(errp, errno, "failed to freeze %s",
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mount->dirname);
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goto error;
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}
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ufssuspend_cnt++;
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}
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return ufssuspend_cnt;
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error:
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close(ufssuspend_fd);
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ufssuspend_fd = -1;
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return -1;
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}
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/*
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* We don't need to call UFSRESUME ioctl because all the frozen FS
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* are thawed on /dev/ufssuspend closing.
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*/
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int qmp_guest_fsfreeze_do_thaw(Error **errp)
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{
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int ret = ufssuspend_cnt;
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ufssuspend_cnt = 0;
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if (ufssuspend_fd != -1) {
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close(ufssuspend_fd);
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ufssuspend_fd = -1;
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}
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return ret;
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}
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GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
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{
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error_setg(errp, QERR_UNSUPPORTED);
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return NULL;
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}
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GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
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{
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error_setg(errp, QERR_UNSUPPORTED);
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return NULL;
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}
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GuestDiskStatsInfoList *qmp_guest_get_diskstats(Error **errp)
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{
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error_setg(errp, QERR_UNSUPPORTED);
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return NULL;
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}
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GuestCpuStatsList *qmp_guest_get_cpustats(Error **errp)
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{
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error_setg(errp, QERR_UNSUPPORTED);
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return NULL;
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}
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#endif /* CONFIG_FSFREEZE */
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