/*
* vmem_create -- create a memory pool in a temp file
*/
VMEM *
vmem_create(const char *dir, size_t size)
{
vmem_init();
LOG(3, "dir \"%s\" size %zu", dir, size);
if (size < VMEM_MIN_POOL) {
ERR("size %zu smaller than %zu", size, VMEM_MIN_POOL);
errno = EINVAL;
return NULL;
}
/* silently enforce multiple of page size */
size = roundup(size, Pagesize);
void *addr;
if ((addr = util_map_tmpfile(dir, size, 4 << 20)) == NULL)
return NULL;
/* store opaque info at beginning of mapped area */
struct vmem *vmp = addr;
memset(&vmp->hdr, '\0', sizeof (vmp->hdr));
memcpy(vmp->hdr.signature, VMEM_HDR_SIG, POOL_HDR_SIG_LEN);
vmp->addr = addr;
vmp->size = size;
vmp->caller_mapped = 0;
/* Prepare pool for jemalloc */
if (je_vmem_pool_create((void *)((uintptr_t)addr + Header_size),
size - Header_size, 1) == NULL) {
ERR("pool creation failed");
util_unmap(vmp->addr, vmp->size);
return NULL;
}
/*
* If possible, turn off all permissions on the pool header page.
*
* The prototype PMFS doesn't allow this when large pages are in
* use. It is not considered an error if this fails.
*/
util_range_none(addr, sizeof (struct pool_hdr));
LOG(3, "vmp %p", vmp);
return vmp;
}
/*
* is_pmem -- checks if given path points to pmem-aware filesystem
*/
static int
is_pmem(const char *path)
{
int ret;
void *addr = util_map_tmpfile(path, SIZE, 0);
if (addr == NULL) {
fprintf(stderr, "file creation failed\n");
return -1;
}
if (pmem_is_pmem(addr, SIZE))
ret = 1;
else
ret = 0;
util_unmap(addr, SIZE);
return ret;
}
