static ssize_t disksize_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
int ret;
u64 disksize;
struct zram *zram = dev_to_zram(dev);
ret = kstrtoull(buf, 10, &disksize);
if (ret)
return ret;
down_write(&zram->init_lock);
if (zram->init_done) {
up_write(&zram->init_lock);
pr_info("Cannot change disksize for initialized device\n");
return -EBUSY;
}
zram->disksize = PAGE_ALIGN(disksize);
set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
up_write(&zram->init_lock);
if (zram_init_device(zram) != 0) {
printk(KERN_ALERT"\n\nzram_init_device failed!\n\n");
}
return len;
}
static ssize_t disksize_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
u64 disksize;
struct zram_meta *meta;
struct zram *zram = dev_to_zram(dev);
disksize = memparse(buf, NULL);
if (!disksize)
return -EINVAL;
disksize = PAGE_ALIGN(disksize);
meta = zram_meta_alloc(disksize);
down_write(&zram->init_lock);
if (zram->init_done) {
up_write(&zram->init_lock);
zram_meta_free(meta);
pr_info("Cannot change disksize for initialized device\n");
return -EBUSY;
}
zram->disksize = disksize;
set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
zram_init_device(zram, meta);
up_write(&zram->init_lock);
return len;
}
static ssize_t initstate_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t len)
{
int ret;
unsigned long do_init;
struct zram *zram = dev_to_zram(dev);
if (zram->init_done) {
pr_info("the device is initialized device\n");
return -EBUSY;
}
ret = strict_strtoul(buf, 10, &do_init);
if (ret)
return ret;
if (!do_init)
return -EINVAL;
zram_init_device(zram);
swapon("/dev/block/zram0", 0);
return len;
}