| /* |
| * Compressed RAM block device |
| * |
| * Copyright (C) 2008, 2009, 2010 Nitin Gupta |
| * |
| * This code is released using a dual license strategy: BSD/GPL |
| * You can choose the licence that better fits your requirements. |
| * |
| * Released under the terms of 3-clause BSD License |
| * Released under the terms of GNU General Public License Version 2.0 |
| * |
| * Project home: http://compcache.googlecode.com/ |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/genhd.h> |
| |
| #include "zram_drv.h" |
| |
| #ifdef CONFIG_SYSFS |
| |
| static u64 zram_stat64_read(struct zram *zram, u64 *v) |
| { |
| u64 val; |
| |
| spin_lock(&zram->stat64_lock); |
| val = *v; |
| spin_unlock(&zram->stat64_lock); |
| |
| return val; |
| } |
| |
| static struct zram *dev_to_zram(struct device *dev) |
| { |
| int i; |
| struct zram *zram = NULL; |
| |
| for (i = 0; i < num_devices; i++) { |
| zram = &devices[i]; |
| if (disk_to_dev(zram->disk) == dev) |
| break; |
| } |
| |
| return zram; |
| } |
| |
| static ssize_t disksize_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct zram *zram = dev_to_zram(dev); |
| |
| return sprintf(buf, "%llu\n", zram->disksize); |
| } |
| |
| static ssize_t disksize_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t len) |
| { |
| int ret; |
| struct zram *zram = dev_to_zram(dev); |
| |
| if (zram->init_done) { |
| pr_info("Cannot change disksize for initialized device\n"); |
| return -EBUSY; |
| } |
| |
| ret = strict_strtoull(buf, 10, &zram->disksize); |
| if (ret) |
| return ret; |
| |
| zram->disksize &= PAGE_MASK; |
| set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT); |
| |
| return len; |
| } |
| |
| static ssize_t initstate_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct zram *zram = dev_to_zram(dev); |
| |
| return sprintf(buf, "%u\n", zram->init_done); |
| } |
| |
| static ssize_t reset_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t len) |
| { |
| int ret; |
| unsigned long do_reset; |
| struct zram *zram; |
| struct block_device *bdev; |
| |
| zram = dev_to_zram(dev); |
| bdev = bdget_disk(zram->disk, 0); |
| |
| /* Do not reset an active device! */ |
| if (bdev->bd_holders) |
| return -EBUSY; |
| |
| ret = strict_strtoul(buf, 10, &do_reset); |
| if (ret) |
| return ret; |
| |
| if (!do_reset) |
| return -EINVAL; |
| |
| /* Make sure all pending I/O is finished */ |
| if (bdev) |
| fsync_bdev(bdev); |
| |
| if (zram->init_done) |
| zram_reset_device(zram); |
| |
| return len; |
| } |
| |
| static ssize_t num_reads_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct zram *zram = dev_to_zram(dev); |
| |
| return sprintf(buf, "%llu\n", |
| zram_stat64_read(zram, &zram->stats.num_reads)); |
| } |
| |
| static ssize_t num_writes_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct zram *zram = dev_to_zram(dev); |
| |
| return sprintf(buf, "%llu\n", |
| zram_stat64_read(zram, &zram->stats.num_writes)); |
| } |
| |
| static ssize_t invalid_io_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct zram *zram = dev_to_zram(dev); |
| |
| return sprintf(buf, "%llu\n", |
| zram_stat64_read(zram, &zram->stats.invalid_io)); |
| } |
| |
| static ssize_t notify_free_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct zram *zram = dev_to_zram(dev); |
| |
| return sprintf(buf, "%llu\n", |
| zram_stat64_read(zram, &zram->stats.notify_free)); |
| } |
| |
| static ssize_t zero_pages_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct zram *zram = dev_to_zram(dev); |
| |
| return sprintf(buf, "%u\n", zram->stats.pages_zero); |
| } |
| |
| static ssize_t orig_data_size_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct zram *zram = dev_to_zram(dev); |
| |
| return sprintf(buf, "%llu\n", |
| (u64)(zram->stats.pages_stored) << PAGE_SHIFT); |
| } |
| |
| static ssize_t compr_data_size_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct zram *zram = dev_to_zram(dev); |
| |
| return sprintf(buf, "%llu\n", |
| zram_stat64_read(zram, &zram->stats.compr_size)); |
| } |
| |
| static ssize_t mem_used_total_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| u64 val = 0; |
| struct zram *zram = dev_to_zram(dev); |
| |
| if (zram->init_done) { |
| val = xv_get_total_size_bytes(zram->mem_pool) + |
| ((u64)(zram->stats.pages_expand) << PAGE_SHIFT); |
| } |
| |
| return sprintf(buf, "%llu\n", val); |
| } |
| |
| static DEVICE_ATTR(disksize, S_IRUGO | S_IWUSR, |
| disksize_show, disksize_store); |
| static DEVICE_ATTR(initstate, S_IRUGO, initstate_show, NULL); |
| static DEVICE_ATTR(reset, S_IWUSR, NULL, reset_store); |
| static DEVICE_ATTR(num_reads, S_IRUGO, num_reads_show, NULL); |
| static DEVICE_ATTR(num_writes, S_IRUGO, num_writes_show, NULL); |
| static DEVICE_ATTR(invalid_io, S_IRUGO, invalid_io_show, NULL); |
| static DEVICE_ATTR(notify_free, S_IRUGO, notify_free_show, NULL); |
| static DEVICE_ATTR(zero_pages, S_IRUGO, zero_pages_show, NULL); |
| static DEVICE_ATTR(orig_data_size, S_IRUGO, orig_data_size_show, NULL); |
| static DEVICE_ATTR(compr_data_size, S_IRUGO, compr_data_size_show, NULL); |
| static DEVICE_ATTR(mem_used_total, S_IRUGO, mem_used_total_show, NULL); |
| |
| static struct attribute *zram_disk_attrs[] = { |
| &dev_attr_disksize.attr, |
| &dev_attr_initstate.attr, |
| &dev_attr_reset.attr, |
| &dev_attr_num_reads.attr, |
| &dev_attr_num_writes.attr, |
| &dev_attr_invalid_io.attr, |
| &dev_attr_notify_free.attr, |
| &dev_attr_zero_pages.attr, |
| &dev_attr_orig_data_size.attr, |
| &dev_attr_compr_data_size.attr, |
| &dev_attr_mem_used_total.attr, |
| NULL, |
| }; |
| |
| struct attribute_group zram_disk_attr_group = { |
| .attrs = zram_disk_attrs, |
| }; |
| |
| #endif /* CONFIG_SYSFS */ |