qga: Add guest-get-fsinfo command
Add command to get mounted filesystems information in the guest.
The returned value contains a list of mountpoint paths and
corresponding disks info such as disk bus type, drive address,
and the disk controllers' PCI addresses, so that management layer
such as libvirt can resolve the disk backends.
For example, when `lsblk' result is:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdb 8:16 0 1G 0 disk
`-sdb1 8:17 0 1024M 0 part
`-vg0-lv0 253:1 0 1.4G 0 lvm /mnt/test
sdc 8:32 0 1G 0 disk
`-sdc1 8:33 0 512M 0 part
`-vg0-lv0 253:1 0 1.4G 0 lvm /mnt/test
vda 252:0 0 25G 0 disk
`-vda1 252:1 0 25G 0 part /
where sdb is a SCSI disk with PCI controller 0000:00:0a.0 and ID=1,
sdc is an IDE disk with PCI controller 0000:00:01.1, and
vda is a virtio-blk disk with PCI device 0000:00:06.0,
guest-get-fsinfo command will return the following result:
{"return":
[{"name":"dm-1",
"mountpoint":"/mnt/test",
"disk":[
{"bus-type":"scsi","bus":0,"unit":1,"target":0,
"pci-controller":{"bus":0,"slot":10,"domain":0,"function":0}},
{"bus-type":"ide","bus":0,"unit":0,"target":0,
"pci-controller":{"bus":0,"slot":1,"domain":0,"function":1}}],
"type":"xfs"},
{"name":"vda1", "mountpoint":"/",
"disk":[
{"bus-type":"virtio","bus":0,"unit":0,"target":0,
"pci-controller":{"bus":0,"slot":6,"domain":0,"function":0}}],
"type":"ext4"}]}
In Linux guest, the disk information is resolved from sysfs. So far,
it only supports virtio-blk, virtio-scsi, IDE, SATA, SCSI disks on x86
hosts, and "disk" parameter may be empty for unsupported disk types.
Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
*updated schema to report 2.2 as initial supported version
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Tomoki Sekiyama
Michael Roth
parent
e99bce2021
commit
46d4c5723e
@ -18,6 +18,7 @@
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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@ -575,6 +576,7 @@ static void guest_file_init(void)
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typedef struct FsMount {
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char *dirname;
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char *devtype;
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unsigned int devmajor, devminor;
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QTAILQ_ENTRY(FsMount) next;
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} FsMount;
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@ -596,15 +598,40 @@ static void free_fs_mount_list(FsMountList *mounts)
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}
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}
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static int dev_major_minor(const char *devpath,
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unsigned int *devmajor, unsigned int *devminor)
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{
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struct stat st;
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*devmajor = 0;
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*devminor = 0;
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if (stat(devpath, &st) < 0) {
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slog("failed to stat device file '%s': %s", devpath, strerror(errno));
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return -1;
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}
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if (S_ISDIR(st.st_mode)) {
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/* It is bind mount */
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return -2;
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}
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if (S_ISBLK(st.st_mode)) {
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*devmajor = major(st.st_rdev);
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*devminor = minor(st.st_rdev);
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return 0;
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}
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return -1;
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}
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/*
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* Walk the mount table and build a list of local file systems
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*/
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static void build_fs_mount_list(FsMountList *mounts, Error **errp)
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static void build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp)
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{
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struct mntent *ment;
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FsMount *mount;
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char const *mtab = "/proc/self/mounts";
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FILE *fp;
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unsigned int devmajor, devminor;
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fp = setmntent(mtab, "r");
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if (!fp) {
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@ -624,20 +651,423 @@ static void build_fs_mount_list(FsMountList *mounts, Error **errp)
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(strcmp(ment->mnt_type, "cifs") == 0)) {
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continue;
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}
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if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) {
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/* Skip bind mounts */
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continue;
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}
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mount = g_malloc0(sizeof(FsMount));
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mount->dirname = g_strdup(ment->mnt_dir);
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mount->devtype = g_strdup(ment->mnt_type);
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mount->devmajor = devmajor;
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mount->devminor = devminor;
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QTAILQ_INSERT_TAIL(mounts, mount, next);
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}
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endmntent(fp);
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}
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static void decode_mntname(char *name, int len)
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{
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int i, j = 0;
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for (i = 0; i <= len; i++) {
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if (name[i] != '\\') {
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name[j++] = name[i];
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} else if (name[i + 1] == '\\') {
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name[j++] = '\\';
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i++;
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} else if (name[i + 1] >= '0' && name[i + 1] <= '3' &&
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name[i + 2] >= '0' && name[i + 2] <= '7' &&
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name[i + 3] >= '0' && name[i + 3] <= '7') {
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name[j++] = (name[i + 1] - '0') * 64 +
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(name[i + 2] - '0') * 8 +
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(name[i + 3] - '0');
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i += 3;
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} else {
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name[j++] = name[i];
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}
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}
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}
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static void build_fs_mount_list(FsMountList *mounts, Error **errp)
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{
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FsMount *mount;
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char const *mountinfo = "/proc/self/mountinfo";
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FILE *fp;
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char *line = NULL, *dash;
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size_t n;
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char check;
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unsigned int devmajor, devminor;
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int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e;
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fp = fopen(mountinfo, "r");
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if (!fp) {
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build_fs_mount_list_from_mtab(mounts, errp);
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return;
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}
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while (getline(&line, &n, fp) != -1) {
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ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c",
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&devmajor, &devminor, &dir_s, &dir_e, &check);
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if (ret < 3) {
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continue;
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}
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dash = strstr(line + dir_e, " - ");
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if (!dash) {
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continue;
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}
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ret = sscanf(dash, " - %n%*s%n %n%*s%n%c",
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&type_s, &type_e, &dev_s, &dev_e, &check);
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if (ret < 1) {
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continue;
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}
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line[dir_e] = 0;
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dash[type_e] = 0;
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dash[dev_e] = 0;
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decode_mntname(line + dir_s, dir_e - dir_s);
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decode_mntname(dash + dev_s, dev_e - dev_s);
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if (devmajor == 0) {
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/* btrfs reports major number = 0 */
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if (strcmp("btrfs", dash + type_s) != 0 ||
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dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) {
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continue;
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}
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}
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mount = g_malloc0(sizeof(FsMount));
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mount->dirname = g_strdup(line + dir_s);
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mount->devtype = g_strdup(dash + type_s);
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mount->devmajor = devmajor;
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mount->devminor = devminor;
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QTAILQ_INSERT_TAIL(mounts, mount, next);
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}
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free(line);
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fclose(fp);
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}
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#endif
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#if defined(CONFIG_FSFREEZE)
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static char *get_pci_driver(char const *syspath, int pathlen, Error **errp)
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{
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char *path;
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char *dpath;
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char *driver = NULL;
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char buf[PATH_MAX];
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ssize_t len;
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path = g_strndup(syspath, pathlen);
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dpath = g_strdup_printf("%s/driver", path);
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len = readlink(dpath, buf, sizeof(buf) - 1);
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if (len != -1) {
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buf[len] = 0;
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driver = g_strdup(basename(buf));
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}
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g_free(dpath);
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g_free(path);
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return driver;
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}
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static int compare_uint(const void *_a, const void *_b)
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{
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unsigned int a = *(unsigned int *)_a;
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unsigned int b = *(unsigned int *)_b;
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return a < b ? -1 : a > b ? 1 : 0;
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}
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/* Walk the specified sysfs and build a sorted list of host or ata numbers */
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static int build_hosts(char const *syspath, char const *host, bool ata,
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unsigned int *hosts, int hosts_max, Error **errp)
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{
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char *path;
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DIR *dir;
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struct dirent *entry;
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int i = 0;
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path = g_strndup(syspath, host - syspath);
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dir = opendir(path);
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if (!dir) {
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error_setg_errno(errp, errno, "opendir(\"%s\")", path);
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g_free(path);
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return -1;
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}
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while (i < hosts_max) {
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entry = readdir(dir);
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if (!entry) {
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break;
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}
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if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) {
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++i;
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} else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) {
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++i;
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}
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}
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qsort(hosts, i, sizeof(hosts[0]), compare_uint);
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g_free(path);
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closedir(dir);
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return i;
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}
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/* Store disk device info specified by @sysfs into @fs */
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static void build_guest_fsinfo_for_real_device(char const *syspath,
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GuestFilesystemInfo *fs,
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Error **errp)
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{
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unsigned int pci[4], host, hosts[8], tgt[3];
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int i, nhosts = 0, pcilen;
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GuestDiskAddress *disk;
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GuestPCIAddress *pciaddr;
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GuestDiskAddressList *list = NULL;
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bool has_ata = false, has_host = false, has_tgt = false;
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char *p, *q, *driver = NULL;
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p = strstr(syspath, "/devices/pci");
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if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n",
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pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) {
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g_debug("only pci device is supported: sysfs path \"%s\"", syspath);
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return;
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}
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driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp);
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if (!driver) {
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goto cleanup;
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}
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p = strstr(syspath, "/target");
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if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
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tgt, tgt + 1, tgt + 2) == 3) {
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has_tgt = true;
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}
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p = strstr(syspath, "/ata");
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if (p) {
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q = p + 4;
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has_ata = true;
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} else {
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p = strstr(syspath, "/host");
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q = p + 5;
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}
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if (p && sscanf(q, "%u", &host) == 1) {
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has_host = true;
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nhosts = build_hosts(syspath, p, has_ata, hosts,
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sizeof(hosts) / sizeof(hosts[0]), errp);
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if (nhosts < 0) {
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goto cleanup;
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}
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}
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pciaddr = g_malloc0(sizeof(*pciaddr));
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pciaddr->domain = pci[0];
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pciaddr->bus = pci[1];
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pciaddr->slot = pci[2];
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pciaddr->function = pci[3];
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disk = g_malloc0(sizeof(*disk));
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disk->pci_controller = pciaddr;
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list = g_malloc0(sizeof(*list));
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list->value = disk;
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if (strcmp(driver, "ata_piix") == 0) {
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/* a host per ide bus, target*:0:<unit>:0 */
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if (!has_host || !has_tgt) {
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g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
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goto cleanup;
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}
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for (i = 0; i < nhosts; i++) {
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if (host == hosts[i]) {
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disk->bus_type = GUEST_DISK_BUS_TYPE_IDE;
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disk->bus = i;
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disk->unit = tgt[1];
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break;
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}
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}
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if (i >= nhosts) {
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g_debug("no host for '%s' (driver '%s')", syspath, driver);
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goto cleanup;
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}
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} else if (strcmp(driver, "sym53c8xx") == 0) {
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/* scsi(LSI Logic): target*:0:<unit>:0 */
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if (!has_tgt) {
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g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
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goto cleanup;
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}
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disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
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disk->unit = tgt[1];
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} else if (strcmp(driver, "virtio-pci") == 0) {
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if (has_tgt) {
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/* virtio-scsi: target*:0:0:<unit> */
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disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
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disk->unit = tgt[2];
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} else {
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/* virtio-blk: 1 disk per 1 device */
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disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
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}
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} else if (strcmp(driver, "ahci") == 0) {
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/* ahci: 1 host per 1 unit */
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if (!has_host || !has_tgt) {
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g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
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goto cleanup;
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}
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for (i = 0; i < nhosts; i++) {
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if (host == hosts[i]) {
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disk->unit = i;
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disk->bus_type = GUEST_DISK_BUS_TYPE_SATA;
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break;
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}
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}
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if (i >= nhosts) {
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g_debug("no host for '%s' (driver '%s')", syspath, driver);
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goto cleanup;
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}
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} else {
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g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath);
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goto cleanup;
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}
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list->next = fs->disk;
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fs->disk = list;
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g_free(driver);
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return;
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cleanup:
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if (list) {
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qapi_free_GuestDiskAddressList(list);
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}
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g_free(driver);
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}
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static void build_guest_fsinfo_for_device(char const *devpath,
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GuestFilesystemInfo *fs,
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Error **errp);
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/* Store a list of slave devices of virtual volume specified by @syspath into
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* @fs */
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static void build_guest_fsinfo_for_virtual_device(char const *syspath,
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GuestFilesystemInfo *fs,
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Error **errp)
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{
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DIR *dir;
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char *dirpath;
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struct dirent entry, *result;
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dirpath = g_strdup_printf("%s/slaves", syspath);
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dir = opendir(dirpath);
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if (!dir) {
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error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath);
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g_free(dirpath);
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return;
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}
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g_free(dirpath);
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for (;;) {
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if (readdir_r(dir, &entry, &result) != 0) {
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error_setg_errno(errp, errno, "readdir_r(\"%s\")", dirpath);
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break;
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}
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if (!result) {
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break;
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}
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if (entry.d_type == DT_LNK) {
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g_debug(" slave device '%s'", entry.d_name);
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dirpath = g_strdup_printf("%s/slaves/%s", syspath, entry.d_name);
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build_guest_fsinfo_for_device(dirpath, fs, errp);
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g_free(dirpath);
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if (*errp) {
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break;
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}
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}
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}
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closedir(dir);
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}
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/* Dispatch to functions for virtual/real device */
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static void build_guest_fsinfo_for_device(char const *devpath,
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GuestFilesystemInfo *fs,
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Error **errp)
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{
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char *syspath = realpath(devpath, NULL);
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if (!syspath) {
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error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
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return;
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}
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if (!fs->name) {
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fs->name = g_strdup(basename(syspath));
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}
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g_debug(" parse sysfs path '%s'", syspath);
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if (strstr(syspath, "/devices/virtual/block/")) {
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build_guest_fsinfo_for_virtual_device(syspath, fs, errp);
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} else {
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build_guest_fsinfo_for_real_device(syspath, fs, errp);
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}
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free(syspath);
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}
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/* Return a list of the disk device(s)' info which @mount lies on */
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static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
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Error **errp)
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{
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GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
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char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
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mount->devmajor, mount->devminor);
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fs->mountpoint = g_strdup(mount->dirname);
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fs->type = g_strdup(mount->devtype);
|
||||
build_guest_fsinfo_for_device(devpath, fs, errp);
|
||||
|
||||
g_free(devpath);
|
||||
return fs;
|
||||
}
|
||||
|
||||
GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
|
||||
{
|
||||
FsMountList mounts;
|
||||
struct FsMount *mount;
|
||||
GuestFilesystemInfoList *new, *ret = NULL;
|
||||
Error *local_err = NULL;
|
||||
|
||||
QTAILQ_INIT(&mounts);
|
||||
build_fs_mount_list(&mounts, &local_err);
|
||||
if (local_err) {
|
||||
error_propagate(errp, local_err);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
QTAILQ_FOREACH(mount, &mounts, next) {
|
||||
g_debug("Building guest fsinfo for '%s'", mount->dirname);
|
||||
|
||||
new = g_malloc0(sizeof(*ret));
|
||||
new->value = build_guest_fsinfo(mount, &local_err);
|
||||
new->next = ret;
|
||||
ret = new;
|
||||
if (local_err) {
|
||||
error_propagate(errp, local_err);
|
||||
qapi_free_GuestFilesystemInfoList(ret);
|
||||
ret = NULL;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
free_fs_mount_list(&mounts);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
typedef enum {
|
||||
FSFREEZE_HOOK_THAW = 0,
|
||||
FSFREEZE_HOOK_FREEZE,
|
||||
@ -1481,6 +1911,12 @@ int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
|
||||
|
||||
#if !defined(CONFIG_FSFREEZE)
|
||||
|
||||
GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
|
||||
{
|
||||
error_set(errp, QERR_UNSUPPORTED);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
|
||||
{
|
||||
error_set(errp, QERR_UNSUPPORTED);
|
||||
|
||||
@ -152,6 +152,12 @@ void qmp_guest_file_flush(int64_t handle, Error **errp)
|
||||
error_set(errp, QERR_UNSUPPORTED);
|
||||
}
|
||||
|
||||
GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
|
||||
{
|
||||
error_set(errp, QERR_UNSUPPORTED);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Return status of freeze/thaw
|
||||
*/
|
||||
|
||||
@ -659,3 +659,82 @@
|
||||
{ 'command': 'guest-set-vcpus',
|
||||
'data': {'vcpus': ['GuestLogicalProcessor'] },
|
||||
'returns': 'int' }
|
||||
|
||||
##
|
||||
# @GuestDiskBusType
|
||||
#
|
||||
# An enumeration of bus type of disks
|
||||
#
|
||||
# @ide: IDE disks
|
||||
# @fdc: floppy disks
|
||||
# @scsi: SCSI disks
|
||||
# @virtio: virtio disks
|
||||
# @xen: Xen disks
|
||||
# @usb: USB disks
|
||||
# @uml: UML disks
|
||||
# @sata: SATA disks
|
||||
# @sd: SD cards
|
||||
#
|
||||
# Since: 2.2
|
||||
##
|
||||
{ 'enum': 'GuestDiskBusType',
|
||||
'data': [ 'ide', 'fdc', 'scsi', 'virtio', 'xen', 'usb', 'uml', 'sata',
|
||||
'sd' ] }
|
||||
|
||||
##
|
||||
# @GuestPCIAddress:
|
||||
#
|
||||
# @domain: domain id
|
||||
# @bus: bus id
|
||||
# @slot: slot id
|
||||
# @function: function id
|
||||
#
|
||||
# Since: 2.2
|
||||
##
|
||||
{ 'type': 'GuestPCIAddress',
|
||||
'data': {'domain': 'int', 'bus': 'int',
|
||||
'slot': 'int', 'function': 'int'} }
|
||||
|
||||
##
|
||||
# @GuestDiskAddress:
|
||||
#
|
||||
# @pci-controller: controller's PCI address
|
||||
# @type: bus type
|
||||
# @bus: bus id
|
||||
# @target: target id
|
||||
# @unit: unit id
|
||||
#
|
||||
# Since: 2.2
|
||||
##
|
||||
{ 'type': 'GuestDiskAddress',
|
||||
'data': {'pci-controller': 'GuestPCIAddress',
|
||||
'bus-type': 'GuestDiskBusType',
|
||||
'bus': 'int', 'target': 'int', 'unit': 'int'} }
|
||||
|
||||
##
|
||||
# @GuestFilesystemInfo
|
||||
#
|
||||
# @name: disk name
|
||||
# @mountpoint: mount point path
|
||||
# @type: file system type string
|
||||
# @disk: an array of disk hardware information that the volume lies on,
|
||||
# which may be empty if the disk type is not supported
|
||||
#
|
||||
# Since: 2.2
|
||||
##
|
||||
{ 'type': 'GuestFilesystemInfo',
|
||||
'data': {'name': 'str', 'mountpoint': 'str', 'type': 'str',
|
||||
'disk': ['GuestDiskAddress']} }
|
||||
|
||||
##
|
||||
# @guest-get-fsinfo:
|
||||
#
|
||||
# Returns: The list of filesystems information mounted in the guest.
|
||||
# The returned mountpoints may be specified to
|
||||
# @guest-fsfreeze-freeze-list.
|
||||
# Network filesystems (such as CIFS and NFS) are not listed.
|
||||
#
|
||||
# Since: 2.2
|
||||
##
|
||||
{ 'command': 'guest-get-fsinfo',
|
||||
'returns': ['GuestFilesystemInfo'] }
|
||||
|
||||
Loading…
Reference in New Issue
Block a user