static void zram_free_page(struct zram *zram, size_t index)
{
struct zram_meta *meta = zram->meta;
unsigned long handle = meta->table[index].handle;
u16 size = meta->table[index].size;
if (unlikely(!handle)) {
/*
* No memory is allocated for zero filled pages.
* Simply clear zero page flag.
*/
if (zram_test_flag(meta, index, ZRAM_ZERO)) {
zram_clear_flag(meta, index, ZRAM_ZERO);
zram->stats.pages_zero--;
}
return;
}
if (unlikely(size > max_zpage_size))
zram->stats.bad_compress--;
zs_free(meta->mem_pool, handle);
if (size <= PAGE_SIZE / 2)
zram->stats.good_compress--;
zram_stat64_sub(zram, &zram->stats.compr_size,
meta->table[index].size);
zram->stats.pages_stored--;
meta->table[index].handle = 0;
meta->table[index].size = 0;
}
static void zram_free_page(struct zram *zram, size_t index)
{
u32 clen;
void *obj;
struct page *page = zram->table[index].page;
u32 offset = zram->table[index].offset;
if (unlikely(!page)) {
/*
* No memory is allocated for zero filled pages.
* Simply clear zero page flag.
*/
if (zram_test_flag(zram, index, ZRAM_ZERO)) {
zram_clear_flag(zram, index, ZRAM_ZERO);
zram_stat_dec(&zram->stats.pages_zero);
}
return;
}
if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED))) {
clen = PAGE_SIZE;
__free_page(page);
zram_clear_flag(zram, index, ZRAM_UNCOMPRESSED);
zram_stat_dec(&zram->stats.pages_expand);
goto out;
}
obj = kmap_atomic(page, KM_USER0) + offset;
clen = xv_get_object_size(obj) - sizeof(struct zobj_header);
kunmap_atomic(obj, KM_USER0);
xv_free(zram->mem_pool, page, offset);
if (clen <= PAGE_SIZE / 2)
zram_stat_dec(&zram->stats.good_compress);
out:
zram_stat64_sub(zram, &zram->stats.compr_size, clen);
zram_stat_dec(&zram->stats.pages_stored);
zram->table[index].page = NULL;
zram->table[index].offset = 0;
}