static int emit_e820_device(int loglevel, struct ndctl_test *test)
{
int err, fd;
char path[256];
const char *bdev;
struct ndctl_ctx *ctx;
struct ndctl_bus *bus;
struct ndctl_region *region;
struct ndctl_namespace *ndns;
enum ndctl_namespace_mode mode;
if (!ndctl_test_attempt(test, KERNEL_VERSION(4, 3, 0)))
return 77;
err = ndctl_new(&ctx);
if (err < 0)
return err;
ndctl_set_log_priority(ctx, loglevel);
err = -ENXIO;
bus = ndctl_bus_get_by_provider(ctx, "e820");
if (!bus)
goto out;
region = ndctl_region_get_first(bus);
if (!region)
goto out;
ndns = ndctl_namespace_get_first(region);
if (!ndns)
goto out;
mode = ndctl_namespace_get_mode(ndns);
if (mode >= 0 && mode != NDCTL_NS_MODE_MEMORY)
goto out;
bdev = ndctl_namespace_get_block_device(ndns);
if (!bdev)
goto out;
if (snprintf(path, sizeof(path), "/dev/%s", bdev) >= (int) sizeof(path))
goto out;
/*
* Note, if the bdev goes active after this check we'll still
* clobber it in the following tests, see test/dax.sh.
*/
fd = open(path, O_RDWR | O_EXCL);
if (fd < 0)
goto out;
err = 0;
fprintf(stdout, "%s\n", path);
out:
if (err)
fprintf(stderr, "%s: failed to find usable victim device\n",
__func__);
ndctl_unref(ctx);
return err;
}
static int emit_e820_device(int loglevel, struct ndctl_test *test)
{
int err, fd;
char path[256];
const char *bdev;
struct ndctl_ctx *ctx;
struct ndctl_bus *bus;
struct ndctl_dax *dax;
struct ndctl_pfn *pfn;
struct ndctl_region *region;
struct ndctl_namespace *ndns;
enum ndctl_namespace_mode mode;
if (!ndctl_test_attempt(test, KERNEL_VERSION(4, 3, 0)))
return 77;
err = ndctl_new(&ctx);
if (err < 0)
return err;
ndctl_set_log_priority(ctx, loglevel);
err = -ENXIO;
bus = ndctl_bus_get_by_provider(ctx, "e820");
if (!bus)
goto out;
region = ndctl_region_get_first(bus);
if (!region)
goto out;
ndns = ndctl_namespace_get_first(region);
if (!ndns)
goto out;
mode = ndctl_namespace_get_mode(ndns);
if (mode >= 0 && mode != NDCTL_NS_MODE_MEMORY)
goto out;
/* if device-dax mode already established it might contain user data */
pfn = ndctl_namespace_get_pfn(ndns);
dax = ndctl_namespace_get_dax(ndns);
if (dax || pfn)
goto out;
/* device is unconfigured, assume that was on purpose */
bdev = ndctl_namespace_get_block_device(ndns);
if (!bdev)
goto out;
if (snprintf(path, sizeof(path), "/dev/%s", bdev) >= (int) sizeof(path))
goto out;
/*
* Note, if the bdev goes active after this check we'll still
* clobber it in the following tests, see test/dax.sh and
* test/device-dax.sh.
*/
fd = open(path, O_RDWR | O_EXCL);
if (fd < 0)
goto out;
err = 0;
out:
if (err) {
fprintf(stderr, "%s: failed to find usable victim device\n",
__func__);
ndctl_test_skip(test);
err = 77;
} else
fprintf(stdout, "%s\n", ndctl_namespace_get_devname(ndns));
ndctl_unref(ctx);
return err;
}
