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qemu: Also treat directories properly when using namespaces

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When recreating folders with namespaces, the directory type was not
being handled at all.  It's not special, we probably just didn't know
that that can be used as a volume path as well.  The code failed
gracefully, but we want to allow that so that we can use <disk
type='dir'> in domains again.

Partially-resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1443434

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Martin Kletzander 2017-08-18 17:33:08 +02:00
parent 3401e208ab
commit ed8661a309
1 changed files with 21 additions and 7 deletions
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28
src/qemu/qemu_domain.c
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@ -7981,6 +7981,7 @@ qemuDomainCreateDeviceRecursive(const char *device,
bool isLink = false;
bool isDev = false;
bool isReg = false;
bool isDir = false;
bool create = false;
#ifdef WITH_SELINUX
char *tcon = NULL;
@ -8005,6 +8006,7 @@ qemuDomainCreateDeviceRecursive(const char *device,
isLink = S_ISLNK(sb.st_mode);
isDev = S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode);
isReg = S_ISREG(sb.st_mode) || S_ISFIFO(sb.st_mode) || S_ISSOCK(sb.st_mode);
isDir = S_ISDIR(sb.st_mode);
/* Here, @device might be whatever path in the system. We
* should create the path in the namespace iff it's "/dev"
@ -8122,6 +8124,10 @@ qemuDomainCreateDeviceRecursive(const char *device,
goto cleanup;
/* Just create the file here so that code below sets
* proper owner and mode. Bind mount only after that. */
} else if (isDir) {
if (create &&
virFileMakePathWithMode(devicePath, sb.st_mode) < 0)
goto cleanup;
} else {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
_("unsupported device type %s 0%o"),
@ -8183,7 +8189,7 @@ qemuDomainCreateDeviceRecursive(const char *device,
#endif
/* Finish mount process started earlier. */
if (isReg &&
if ((isReg || isDir) &&
virFileBindMountDevice(device, devicePath) < 0)
goto cleanup;
@ -8812,6 +8818,7 @@ qemuDomainAttachDeviceMknodHelper(pid_t pid ATTRIBUTE_UNUSED,
bool isLink = S_ISLNK(data->sb.st_mode);
bool isDev = S_ISCHR(data->sb.st_mode) || S_ISBLK(data->sb.st_mode);
bool isReg = S_ISREG(data->sb.st_mode) || S_ISFIFO(data->sb.st_mode) || S_ISSOCK(data->sb.st_mode);
bool isDir = S_ISDIR(data->sb.st_mode);
qemuSecurityPostFork(data->driver->securityManager);
@ -8850,7 +8857,7 @@ qemuDomainAttachDeviceMknodHelper(pid_t pid ATTRIBUTE_UNUSED,
} else {
delDevice = true;
}
} else if (isReg) {
} else if (isReg || isDir) {
/* We are not cleaning up disks on virDomainDetachDevice
* because disk might be still in use by different disk
* as its backing chain. This might however clash here.
@ -8862,7 +8869,8 @@ qemuDomainAttachDeviceMknodHelper(pid_t pid ATTRIBUTE_UNUSED,
data->file);
goto cleanup;
}
if (virFileTouch(data->file, data->sb.st_mode) < 0)
if ((isReg && virFileTouch(data->file, data->sb.st_mode) < 0) ||
(isDir && virFileMakePathWithMode(data->file, data->sb.st_mode) < 0))
goto cleanup;
delDevice = true;
/* Just create the file here so that code below sets
@ -8914,14 +8922,18 @@ qemuDomainAttachDeviceMknodHelper(pid_t pid ATTRIBUTE_UNUSED,
# endif
/* Finish mount process started earlier. */
if (isReg &&
if ((isReg || isDir) &&
virFileMoveMount(data->target, data->file) < 0)
goto cleanup;
ret = 0;
cleanup:
if (ret < 0 && delDevice)
unlink(data->file);
if (ret < 0 && delDevice) {
if (isDir)
virFileDeleteTree(data->file);
else
unlink(data->file);
}
# ifdef WITH_SELINUX
freecon(data->tcon);
# endif
@ -8944,6 +8956,7 @@ qemuDomainAttachDeviceMknodRecursive(virQEMUDriverPtr driver,
char *target = NULL;
bool isLink;
bool isReg;
bool isDir;
if (!ttl) {
virReportSystemError(ELOOP,
@ -8966,8 +8979,9 @@ qemuDomainAttachDeviceMknodRecursive(virQEMUDriverPtr driver,
isLink = S_ISLNK(data.sb.st_mode);
isReg = S_ISREG(data.sb.st_mode) || S_ISFIFO(data.sb.st_mode) || S_ISSOCK(data.sb.st_mode);
isDir = S_ISDIR(data.sb.st_mode);
if (isReg && STRPREFIX(file, DEVPREFIX)) {
if ((isReg || isDir) && STRPREFIX(file, DEVPREFIX)) {
cfg = virQEMUDriverGetConfig(driver);
if (!(target = qemuDomainGetPreservedMountPath(cfg, vm, file)))
goto cleanup;