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device_mapper: reduce min_size for flatten

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For most ioctl() we do not need to pass so big buffers
and we can reduce amount of zeroed memory blocks.
This commit is contained in:
Zdenek Kabelac 2021-02-27 21:22:41 +01:00
parent 73bea16c92
commit 67790d7e3b
1 changed files with 13 additions and 1 deletions
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14
device_mapper/ioctl/libdm-iface.c
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@ -1118,7 +1118,7 @@ static int _add_params(int type)
static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
{
const size_t min_size = 16 * 1024;
size_t min_size;
const int (*version)[3];
struct dm_ioctl *dmi;
@ -1137,6 +1137,18 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
else if (dmt->head)
log_debug_activation(INTERNAL_ERROR "dm '%s' ioctl should not define parameters.",
_cmd_data_v4[dmt->type].name);
switch (dmt->type) {
case DM_DEVICE_CREATE:
case DM_DEVICE_DEPS:
case DM_DEVICE_INFO:
case DM_DEVICE_LIST:
case DM_DEVICE_STATUS:
case DM_DEVICE_TABLE:
case DM_DEVICE_TARGET_MSG:
min_size = 16 * 1024;
default:
min_size = 2 * 1024;
}
if (count && (dmt->sector || dmt->message)) {
log_error("targets and message are incompatible");