zram: use zcomp compressing backends
Do not perform direct LZO compress/decompress calls, initialise
and use zcomp LZO backend (single compression stream) instead.
[akpm@linux-foundation.org: resolve conflicts with zram-delete-zram_init_device-fix.patch]
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 76ba676..98823f9 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -29,7 +29,6 @@
#include <linux/genhd.h>
#include <linux/highmem.h>
#include <linux/slab.h>
-#include <linux/lzo.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
@@ -38,6 +37,7 @@
/* Globals */
static int zram_major;
static struct zram *zram_devices;
+static const char *default_compressor = "lzo";
/* Module params (documentation at end) */
static unsigned int num_devices = 1;
@@ -160,8 +160,6 @@
static void zram_meta_free(struct zram_meta *meta)
{
zs_destroy_pool(meta->mem_pool);
- kfree(meta->compress_workmem);
- free_pages((unsigned long)meta->compress_buffer, 1);
vfree(meta->table);
kfree(meta);
}
@@ -173,22 +171,11 @@
if (!meta)
goto out;
- meta->compress_workmem = kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
- if (!meta->compress_workmem)
- goto free_meta;
-
- meta->compress_buffer =
- (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
- if (!meta->compress_buffer) {
- pr_err("Error allocating compressor buffer space\n");
- goto free_workmem;
- }
-
num_pages = disksize >> PAGE_SHIFT;
meta->table = vzalloc(num_pages * sizeof(*meta->table));
if (!meta->table) {
pr_err("Error allocating zram address table\n");
- goto free_buffer;
+ goto free_meta;
}
meta->mem_pool = zs_create_pool(GFP_NOIO | __GFP_HIGHMEM);
@@ -198,15 +185,10 @@
}
rwlock_init(&meta->tb_lock);
- mutex_init(&meta->buffer_lock);
return meta;
free_table:
vfree(meta->table);
-free_buffer:
- free_pages((unsigned long)meta->compress_buffer, 1);
-free_workmem:
- kfree(meta->compress_workmem);
free_meta:
kfree(meta);
meta = NULL;
@@ -280,8 +262,7 @@
static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
{
- int ret = LZO_E_OK;
- size_t clen = PAGE_SIZE;
+ int ret = 0;
unsigned char *cmem;
struct zram_meta *meta = zram->meta;
unsigned long handle;
@@ -301,12 +282,12 @@
if (size == PAGE_SIZE)
copy_page(mem, cmem);
else
- ret = lzo1x_decompress_safe(cmem, size, mem, &clen);
+ ret = zcomp_decompress(zram->comp, cmem, size, mem);
zs_unmap_object(meta->mem_pool, handle);
read_unlock(&meta->tb_lock);
/* Should NEVER happen. Return bio error if it does. */
- if (unlikely(ret != LZO_E_OK)) {
+ if (unlikely(ret)) {
pr_err("Decompression failed! err=%d, page=%u\n", ret, index);
atomic64_inc(&zram->stats.failed_reads);
return ret;
@@ -349,7 +330,7 @@
ret = zram_decompress_page(zram, uncmem, index);
/* Should NEVER happen. Return bio error if it does. */
- if (unlikely(ret != LZO_E_OK))
+ if (unlikely(ret))
goto out_cleanup;
if (is_partial_io(bvec))
@@ -374,11 +355,10 @@
struct page *page;
unsigned char *user_mem, *cmem, *src, *uncmem = NULL;
struct zram_meta *meta = zram->meta;
+ struct zcomp_strm *zstrm;
bool locked = false;
page = bvec->bv_page;
- src = meta->compress_buffer;
-
if (is_partial_io(bvec)) {
/*
* This is a partial IO. We need to read the full page
@@ -394,7 +374,7 @@
goto out;
}
- mutex_lock(&meta->buffer_lock);
+ zstrm = zcomp_strm_find(zram->comp);
locked = true;
user_mem = kmap_atomic(page);
@@ -420,22 +400,20 @@
goto out;
}
- ret = lzo1x_1_compress(uncmem, PAGE_SIZE, src, &clen,
- meta->compress_workmem);
+ ret = zcomp_compress(zram->comp, zstrm, uncmem, &clen);
if (!is_partial_io(bvec)) {
kunmap_atomic(user_mem);
user_mem = NULL;
uncmem = NULL;
}
- if (unlikely(ret != LZO_E_OK)) {
+ if (unlikely(ret)) {
pr_err("Compression failed! err=%d\n", ret);
goto out;
}
-
+ src = zstrm->buffer;
if (unlikely(clen > max_zpage_size)) {
clen = PAGE_SIZE;
- src = NULL;
if (is_partial_io(bvec))
src = uncmem;
}
@@ -457,6 +435,8 @@
memcpy(cmem, src, clen);
}
+ zcomp_strm_release(zram->comp, zstrm);
+ locked = false;
zs_unmap_object(meta->mem_pool, handle);
/*
@@ -475,10 +455,9 @@
atomic64_inc(&zram->stats.pages_stored);
out:
if (locked)
- mutex_unlock(&meta->buffer_lock);
+ zcomp_strm_release(zram->comp, zstrm);
if (is_partial_io(bvec))
kfree(uncmem);
-
if (ret)
atomic64_inc(&zram->stats.failed_writes);
return ret;
@@ -522,6 +501,7 @@
zs_free(meta->mem_pool, handle);
}
+ zcomp_destroy(zram->comp);
zram_meta_free(zram->meta);
zram->meta = NULL;
/* Reset stats */
@@ -539,6 +519,7 @@
u64 disksize;
struct zram_meta *meta;
struct zram *zram = dev_to_zram(dev);
+ int err;
disksize = memparse(buf, NULL);
if (!disksize)
@@ -551,10 +532,17 @@
down_write(&zram->init_lock);
if (init_done(zram)) {
- zram_meta_free(meta);
- up_write(&zram->init_lock);
pr_info("Cannot change disksize for initialized device\n");
- return -EBUSY;
+ err = -EBUSY;
+ goto out_free_meta;
+ }
+
+ zram->comp = zcomp_create(default_compressor);
+ if (!zram->comp) {
+ pr_info("Cannot initialise %s compressing backend\n",
+ default_compressor);
+ err = -EINVAL;
+ goto out_free_meta;
}
zram->meta = meta;
@@ -563,6 +551,11 @@
up_write(&zram->init_lock);
return len;
+
+out_free_meta:
+ up_write(&zram->init_lock);
+ zram_meta_free(meta);
+ return err;
}
static ssize_t reset_store(struct device *dev,