Breaks HVM guest creation (bugzilla #1221).
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
}
-static int launch_tapdisk_provider(char **argv)
+int launch_tapdisk(char *wrctldev, char *rdctldev)
{
+ char *argv[] = { "tapdisk", wrctldev, rdctldev, NULL };
pid_t child;
if ((child = fork()) < 0)
i != STDERR_FILENO)
close(i);
- execvp(argv[0], argv);
- DPRINTF("execvp failed: %d (%s)\n", errno, strerror(errno));
- DPRINTF("PATH = %s\n", getenv("PATH"));
+ execvp("tapdisk", argv);
_exit(1);
} else {
pid_t got;
got = waitpid(child, NULL, 0);
} while (got != child);
}
- return child;
-}
-
-static int launch_tapdisk(char *wrctldev, char *rdctldev)
-{
- char *argv[] = { "tapdisk", wrctldev, rdctldev, NULL };
-
- if (launch_tapdisk_provider(argv) < 0)
- return -1;
-
return 0;
}
-static int launch_tapdisk_ioemu(void)
-{
- char *argv[] = { "tapdisk-ioemu", NULL };
- return launch_tapdisk_provider(argv);
-}
-
-/*
- * Connect to an ioemu based disk provider (qemu-dm or tapdisk-ioemu)
- *
- * If the domain has a device model, connect to qemu-dm through the
- * domain specific pipe. Otherwise use a single tapdisk-ioemu instance
- * which is represented by domid 0 and provides access for Dom0 and
- * all DomUs without device model.
- */
-static int connect_qemu(blkif_t *blkif, int domid)
+/* Connect to qemu-dm */
+static int connect_qemu(blkif_t *blkif)
{
char *rdctldev, *wrctldev;
-
- static int tapdisk_ioemu_pid = 0;
- static int dom0_readfd = 0;
- static int dom0_writefd = 0;
- if (asprintf(&rdctldev, BLKTAP_CTRL_DIR "/qemu-read-%d", domid) < 0)
+ if (asprintf(&rdctldev, BLKTAP_CTRL_DIR "/qemu-read-%d",
+ blkif->domid) < 0)
return -1;
- if (asprintf(&wrctldev, BLKTAP_CTRL_DIR "/qemu-write-%d", domid) < 0) {
+ if (asprintf(&wrctldev, BLKTAP_CTRL_DIR "/qemu-write-%d",
+ blkif->domid) < 0) {
free(rdctldev);
return -1;
}
DPRINTF("Using qemu blktap pipe: %s\n", rdctldev);
- if (domid == 0) {
- /*
- * tapdisk-ioemu exits as soon as the last image is
- * disconnected. Check if it is still running.
- */
- if (tapdisk_ioemu_pid == 0 || kill(tapdisk_ioemu_pid, 0)) {
- /* No device model and tapdisk-ioemu doesn't run yet */
- DPRINTF("Launching tapdisk-ioemu\n");
- tapdisk_ioemu_pid = launch_tapdisk_ioemu();
-
- dom0_readfd = open_ctrl_socket(wrctldev);
- dom0_writefd = open_ctrl_socket(rdctldev);
- }
-
- DPRINTF("Using tapdisk-ioemu connection\n");
- blkif->fds[READ] = dom0_readfd;
- blkif->fds[WRITE] = dom0_writefd;
- } else if (access(rdctldev, R_OK | W_OK) == 0) {
- /* Use existing pipe to the device model */
- DPRINTF("Using qemu-dm connection\n");
- blkif->fds[READ] = open_ctrl_socket(wrctldev);
- blkif->fds[WRITE] = open_ctrl_socket(rdctldev);
- } else {
- /* No device model => try with tapdisk-ioemu */
- DPRINTF("No device model\n");
- connect_qemu(blkif, 0);
- }
+ blkif->fds[READ] = open_ctrl_socket(wrctldev);
+ blkif->fds[WRITE] = open_ctrl_socket(rdctldev);
free(rdctldev);
free(wrctldev);
if (!exist) {
if (type == DISK_TYPE_IOEMU) {
- if (connect_qemu(blkif, blkif->domid))
+ if (connect_qemu(blkif))
goto fail;
} else {
if (connect_tapdisk(blkif, minor))
DISK_TYPE_IOEMU,
"ioemu disk",
"ioemu",
- 1,
+ 0,
#ifdef TAPDISK
NULL
#endif
install: all $(if $(BUILD_DOCS),install-doc)
mkdir -p "$(DESTDIR)$(bindir)"
- $(INSTALL) -m 755 $(TOOLS) "$(DESTDIR)$(SBINDIR)"
+ $(INSTALL) -m 755 $(TOOLS) "$(DESTDIR)$(prefix)/sbin"
# mkdir -p "$(DESTDIR)$(datadir)"
# for x in bios.bin vgabios.bin vgabios-cirrus.bin ppc_rom.bin \
# video.x openbios-sparc32 linux_boot.bin pxe-ne2k_pci.bin \
*/
static int open_ctrl_socket(char *devname)
{
+ int ret;
int ipc_fd;
if (mkdir(BLKTAP_CTRL_DIR, 0755) == 0)
DPRINTF("Created %s directory\n", BLKTAP_CTRL_DIR);
- if (access(devname, R_OK | W_OK))
+ ret = mkfifo(devname,S_IRWXU|S_IRWXG|S_IRWXO);
+ if ( (ret != 0) && (errno != EEXIST) ) {
+ DPRINTF("ERROR: pipe failed (%d)\n", errno);
return -1;
+ }
ipc_fd = open(devname,O_RDWR|O_NONBLOCK);
return ipc_fd;
}
+/**
+ * Unmaps all disks and closes their pipes
+ */
+void shutdown_blktap(void)
+{
+ fd_list_entry_t *ptr;
+ struct td_state *s;
+ char *devname;
+
+ DPRINTF("Shutdown blktap\n");
+
+ /* Unmap all disks */
+ ptr = fd_start;
+ while (ptr != NULL) {
+ s = ptr->s;
+ unmap_disk(s);
+ close(ptr->tap_fd);
+ ptr = ptr->next;
+ }
+
+ /* Delete control pipes */
+ if (asprintf(&devname, BLKTAP_CTRL_DIR "/qemu-read-%d", domid) >= 0) {
+ DPRINTF("Delete %s\n", devname);
+ if (unlink(devname))
+ DPRINTF("Could not delete: %s\n", strerror(errno));
+ free(devname);
+ }
+
+ if (asprintf(&devname, BLKTAP_CTRL_DIR "/qemu-write-%d", domid) >= 0) {
+ DPRINTF("Delete %s\n", devname);
+ if (unlink(devname))
+ DPRINTF("Could not delete: %s\n", strerror(errno));
+ free(devname);
+ }
+}
+
/**
* Initialize the blktap interface, i.e. open a pair of pipes in /var/run/tap
* and register a fd handler.
/* Attach a handler to the read pipe (called from qemu main loop) */
qemu_set_fd_handler2(read_fd, NULL, &handle_blktap_ctrlmsg, NULL, NULL);
+ /* Register handler to clean up when the domain is destroyed */
+ atexit(&shutdown_blktap);
+
return 0;
}
#include <string.h>
#include <stdint.h>
#include <signal.h>
-#include <unistd.h>
#include <sys/time.h>
#include <assert.h>
extern void *qemu_mallocz(size_t size);
extern void qemu_free(void *ptr);
-extern void *fd_start;
-
int domid = 0;
FILE* logfile;
int max_fd;
fd_set rfds;
struct timeval tv;
- void *old_fd_start = NULL;
logfile = stderr;
bdrv_init();
qemu_aio_init();
init_blktap();
-
- /* Daemonize */
- if (fork() != 0)
- exit(0);
/*
* Main loop: Pass events to the corrsponding handlers and check for
} else
pioh = &ioh->next;
}
-
- /* Exit when the last image has been closed */
- if (old_fd_start != NULL && fd_start == NULL)
- exit(0);
-
- old_fd_start = fd_start;
}
return 0;
}
cpu_interrupt(cpu_single_env, CPU_INTERRUPT_EXIT);
}
+static void qemu_sighup_handler(int signal)
+{
+ fprintf(stderr, "Received SIGHUP, terminating.\n");
+ exit(0);
+}
+
void main_loop_wait(int timeout)
{
IOHandlerRecord *ioh;
#ifndef CONFIG_STUBDOM
/* Unblock SIGTERM and SIGHUP, which may have been blocked by the caller */
- signal(SIGHUP, SIG_DFL);
+ signal(SIGHUP, qemu_sighup_handler);
sigemptyset(&set);
sigaddset(&set, SIGTERM);
sigaddset(&set, SIGHUP);
@raise: VmError for invalid devices
"""
- if self.image:
- self.image.prepareEnvironment()
-
ordered_refs = self.info.ordered_device_refs()
for dev_uuid in ordered_refs:
devclass, config = self.info['devices'][dev_uuid]
"""Build the domain. Define in subclass."""
raise NotImplementedError()
- def prepareEnvironment(self):
- """Prepare the environment for the execution of the domain. This
- method is called before any devices are set up."""
-
- domid = self.vm.getDomid()
-
- # Delete left-over pipes
- try:
- os.unlink('/var/run/tap/qemu-read-%d' % domid)
- os.unlink('/var/run/tap/qemu-write-%d' % domid)
- except:
- pass
-
- # No device model, don't create pipes
- if self.device_model is None:
- return
-
- # If we use a device model, the pipes for communication between
- # blktapctrl and ioemu must be present before the devices are
- # created (blktapctrl must access them for new block devices)
- os.mkfifo('/var/run/tap/qemu-read-%d' % domid, 0600)
- os.mkfifo('/var/run/tap/qemu-write-%d' % domid, 0600)
-
-
# Return a list of cmd line args to the device models based on the
# xm config file
def parseDeviceModelArgs(self, vmConfig):
self.pid = None
state = xstransact.Remove("/local/domain/0/device-model/%i"
% self.vm.getDomid())
-
- try:
- os.unlink('/var/run/tap/qemu-read-%d' % self.vm.getDomid())
- os.unlink('/var/run/tap/qemu-write-%d' % self.vm.getDomid())
- except:
- pass
class LinuxImageHandler(ImageHandler):
projects / xen.git / commitdiff