void
tapdisk_vbd_close_vdi(td_vbd_t *vbd)
{
int err;
err = vbd_stats_destroy(vbd);
if (err) {
EPRINTF("failed to destroy RRD stats file: %s (error ignored)\n",
strerror(-err));
}
tapdisk_image_close_chain(&vbd->images);
if (vbd->secondary &&
vbd->secondary_mode != TD_VBD_SECONDARY_MIRROR) {
tapdisk_image_close(vbd->secondary);
vbd->secondary = NULL;
}
if (vbd->retired) {
tapdisk_image_close(vbd->retired);
vbd->retired = NULL;
}
td_flag_set(vbd->state, TD_VBD_CLOSED);
}
static int
vbd_stats_create(td_vbd_t *vbd) {
int err;
ASSERT(vbd);
err = mkdir("/dev/shm/metrics", S_IRUSR | S_IWUSR);
if (err && errno != EEXIST)
goto out;
/*
* FIXME we use tap-<tapdisk PID>-<minor number> for now, might want to
* reconsider
*/
err = asprintf(&vbd->rrd.path, "/dev/shm/metrics/tap-%d-%d", getpid(),
vbd->uuid);
if (err == -1) {
err = errno;
vbd->rrd.path = NULL;
EPRINTF("failed to create metric file: %s\n", strerror(err));
goto out;
}
err = 0;
vbd->rrd.fd = open(vbd->rrd.path, O_CREAT | O_TRUNC | O_RDWR | O_EXCL,
S_IRUSR | S_IWUSR);
if (vbd->rrd.fd == -1) {
err = errno;
EPRINTF("failed to open %s: %s\n", vbd->rrd.path, strerror(err));
goto out;
}
err = ftruncate(vbd->rrd.fd, RRD_SHM_SIZE);
if (err == -1) {
err = errno;
EPRINTF("failed to truncate %s: %s\n", vbd->rrd.path, strerror(err));
goto out;
}
vbd->rrd.mem = mmap(NULL, RRD_SHM_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
vbd->rrd.fd, 0);
if (vbd->rrd.mem == MAP_FAILED) {
err = errno;
EPRINTF("failed to mmap %s: %s\n", vbd->rrd.path, strerror(err));
goto out;
}
out:
if (err) {
int err2 = vbd_stats_destroy(vbd);
if (err2)
EPRINTF("failed to clean up failed RRD shared memory creation: "
"%s (error ignored)\n", strerror(-err2));
}
return -err;
}
static int
vbd_stats_create(td_vbd_t *vbd) {
int err;
ASSERT(vbd);
err = mkdir("/dev/shm/metrics", S_IRUSR | S_IWUSR);
if (likely(err)) {
err = errno;
if (unlikely(err != EEXIST))
goto out;
else
err = 0;
}
/*
* FIXME Rename this to something like "vbd3-domid-devid". Consider
* consolidating this with the io_ring shared memory file. Check if blkback
* exports the same information in some sysfs file and if so move this to
* the ring location.
*/
err = asprintf(&vbd->rrd.shm.path, "/dev/shm/metrics/tap-%d-%d", getpid(),
vbd->uuid);
if (err == -1) {
err = errno;
vbd->rrd.shm.path = NULL;
EPRINTF("failed to create metric file: %s\n", strerror(err));
goto out;
}
err = 0;
vbd->rrd.shm.size = PAGE_SIZE;
err = shm_create(&vbd->rrd.shm);
if (err)
EPRINTF("failed to create RRD: %s\n", strerror(err));
out:
if (err) {
int err2 = vbd_stats_destroy(vbd);
if (err2)
EPRINTF("failed to clean up failed RRD shared memory creation: "
"%s (error ignored)\n", strerror(-err2));
}
return -err;
}
