struct zram *zram_devices;
/* Module params (documentation at end) */
-unsigned int zram_num_devices;
+static unsigned int num_devices;
static void zram_stat_inc(u32 *v)
{
static void zram_free_page(struct zram *zram, size_t index)
{
- u32 clen;
- void *obj;
+ void *handle = zram->table[index].handle;
- struct page *page = zram->table[index].page;
- u32 offset = zram->table[index].offset;
-
- if (unlikely(!page)) {
+ if (unlikely(!handle)) {
/*
* No memory is allocated for zero filled pages.
* Simply clear zero page flag.
}
if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED))) {
- clen = PAGE_SIZE;
- __free_page(page);
+ __free_page(handle);
zram_clear_flag(zram, index, ZRAM_UNCOMPRESSED);
zram_stat_dec(&zram->stats.pages_expand);
goto out;
}
- obj = kmap_atomic(page) + offset;
- clen = xv_get_object_size(obj) - sizeof(struct zobj_header);
- kunmap_atomic(obj);
+ zs_free(zram->mem_pool, handle);
- xv_free(zram->mem_pool, page, offset);
- if (clen <= PAGE_SIZE / 2)
+ if (zram->table[index].size <= PAGE_SIZE / 2)
zram_stat_dec(&zram->stats.good_compress);
out:
- zram_stat64_sub(zram, &zram->stats.compr_size, clen);
+ zram_stat64_sub(zram, &zram->stats.compr_size,
+ zram->table[index].size);
zram_stat_dec(&zram->stats.pages_stored);
- zram->table[index].page = NULL;
- zram->table[index].offset = 0;
+ zram->table[index].handle = NULL;
+ zram->table[index].size = 0;
}
static void handle_zero_page(struct bio_vec *bvec)
unsigned char *user_mem, *cmem;
user_mem = kmap_atomic(page);
- cmem = kmap_atomic(zram->table[index].page);
+ cmem = kmap_atomic(zram->table[index].handle);
memcpy(user_mem + bvec->bv_offset, cmem + offset, bvec->bv_len);
kunmap_atomic(cmem);
}
/* Requested page is not present in compressed area */
- if (unlikely(!zram->table[index].page)) {
+ if (unlikely(!zram->table[index].handle)) {
pr_debug("Read before write: sector=%lu, size=%u",
(ulong)(bio->bi_sector), bio->bi_size);
handle_zero_page(bvec);
uncmem = user_mem;
clen = PAGE_SIZE;
- cmem = kmap_atomic(zram->table[index].page) +
- zram->table[index].offset;
+ cmem = zs_map_object(zram->mem_pool, zram->table[index].handle);
ret = lzo1x_decompress_safe(cmem + sizeof(*zheader),
- xv_get_object_size(cmem) - sizeof(*zheader),
+ zram->table[index].size,
uncmem, &clen);
if (is_partial_io(bvec)) {
kfree(uncmem);
}
- kunmap_atomic(cmem);
+ zs_unmap_object(zram->mem_pool, zram->table[index].handle);
kunmap_atomic(user_mem);
/* Should NEVER happen. Return bio error if it does. */
unsigned char *cmem;
if (zram_test_flag(zram, index, ZRAM_ZERO) ||
- !zram->table[index].page) {
+ !zram->table[index].handle) {
memset(mem, 0, PAGE_SIZE);
return 0;
}
- cmem = kmap_atomic(zram->table[index].page) +
- zram->table[index].offset;
+ cmem = zs_map_object(zram->mem_pool, zram->table[index].handle);
/* Page is stored uncompressed since it's incompressible */
if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED))) {
}
ret = lzo1x_decompress_safe(cmem + sizeof(*zheader),
- xv_get_object_size(cmem) - sizeof(*zheader),
+ zram->table[index].size,
mem, &clen);
- kunmap_atomic(cmem);
+ zs_unmap_object(zram->mem_pool, zram->table[index].handle);
/* Should NEVER happen. Return bio error if it does. */
if (unlikely(ret != LZO_E_OK)) {
int ret;
u32 store_offset;
size_t clen;
+ void *handle;
struct zobj_header *zheader;
struct page *page, *page_store;
unsigned char *user_mem, *cmem, *src, *uncmem = NULL;
* System overwrites unused sectors. Free memory associated
* with this sector now.
*/
- if (zram->table[index].page ||
+ if (zram->table[index].handle ||
zram_test_flag(zram, index, ZRAM_ZERO))
zram_free_page(zram, index);
store_offset = 0;
zram_set_flag(zram, index, ZRAM_UNCOMPRESSED);
zram_stat_inc(&zram->stats.pages_expand);
- zram->table[index].page = page_store;
+ handle = page_store;
src = kmap_atomic(page);
+ cmem = kmap_atomic(page_store);
goto memstore;
}
- if (xv_malloc(zram->mem_pool, clen + sizeof(*zheader),
- &zram->table[index].page, &store_offset,
- GFP_NOIO | __GFP_HIGHMEM)) {
+ handle = zs_malloc(zram->mem_pool, clen + sizeof(*zheader));
+ if (!handle) {
pr_info("Error allocating memory for compressed "
"page: %u, size=%zu\n", index, clen);
ret = -ENOMEM;
goto out;
}
+ cmem = zs_map_object(zram->mem_pool, handle);
memstore:
- zram->table[index].offset = store_offset;
-
- cmem = kmap_atomic(zram->table[index].page) +
- zram->table[index].offset;
-
#if 0
/* Back-reference needed for memory defragmentation */
if (!zram_test_flag(zram, index, ZRAM_UNCOMPRESSED)) {
memcpy(cmem, src, clen);
- kunmap_atomic(cmem);
- if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED)))
+ if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED))) {
+ kunmap_atomic(cmem);
kunmap_atomic(src);
+ } else {
+ zs_unmap_object(zram->mem_pool, handle);
+ }
+
+ zram->table[index].handle = handle;
+ zram->table[index].size = clen;
/* Update stats */
zram_stat64_add(zram, &zram->stats.compr_size, clen);
/* Free all pages that are still in this zram device */
for (index = 0; index < zram->disksize >> PAGE_SHIFT; index++) {
- struct page *page;
- u16 offset;
-
- page = zram->table[index].page;
- offset = zram->table[index].offset;
-
- if (!page)
+ void *handle = zram->table[index].handle;
+ if (!handle)
continue;
if (unlikely(zram_test_flag(zram, index, ZRAM_UNCOMPRESSED)))
- __free_page(page);
+ __free_page(handle);
else
- xv_free(zram->mem_pool, page, offset);
+ zs_free(zram->mem_pool, handle);
}
vfree(zram->table);
zram->table = NULL;
- xv_destroy_pool(zram->mem_pool);
+ zs_destroy_pool(zram->mem_pool);
zram->mem_pool = NULL;
/* Reset stats */
/* zram devices sort of resembles non-rotational disks */
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
- zram->mem_pool = xv_create_pool();
+ zram->mem_pool = zs_create_pool("zram", GFP_NOIO | __GFP_HIGHMEM);
if (!zram->mem_pool) {
pr_err("Error creating memory pool\n");
ret = -ENOMEM;
blk_cleanup_queue(zram->queue);
}
+unsigned int zram_get_num_devices(void)
+{
+ return num_devices;
+}
+
static int __init zram_init(void)
{
int ret, dev_id;
- if (zram_num_devices > max_num_devices) {
+ if (num_devices > max_num_devices) {
pr_warning("Invalid value for num_devices: %u\n",
- zram_num_devices);
+ num_devices);
ret = -EINVAL;
goto out;
}
goto out;
}
- if (!zram_num_devices) {
+ if (!num_devices) {
pr_info("num_devices not specified. Using default: 1\n");
- zram_num_devices = 1;
+ num_devices = 1;
}
/* Allocate the device array and initialize each one */
- pr_info("Creating %u devices ...\n", zram_num_devices);
- zram_devices = kzalloc(zram_num_devices * sizeof(struct zram), GFP_KERNEL);
+ pr_info("Creating %u devices ...\n", num_devices);
+ zram_devices = kzalloc(num_devices * sizeof(struct zram), GFP_KERNEL);
if (!zram_devices) {
ret = -ENOMEM;
goto unregister;
}
- for (dev_id = 0; dev_id < zram_num_devices; dev_id++) {
+ for (dev_id = 0; dev_id < num_devices; dev_id++) {
ret = create_device(&zram_devices[dev_id], dev_id);
if (ret)
goto free_devices;
int i;
struct zram *zram;
- for (i = 0; i < zram_num_devices; i++) {
+ for (i = 0; i < num_devices; i++) {
zram = &zram_devices[i];
destroy_device(zram);
pr_debug("Cleanup done!\n");
}
-module_param(zram_num_devices, uint, 0);
-MODULE_PARM_DESC(zram_num_devices, "Number of zram devices");
+module_param(num_devices, uint, 0);
+MODULE_PARM_DESC(num_devices, "Number of zram devices");
module_init(zram_init);
module_exit(zram_exit);
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / blobdiff