Staging: zram: Replace ioctls with sysfs interface
Creates per-device sysfs nodes in /sys/block/zram<id>/ Currently following stats are exported: - disksize - num_reads - num_writes - invalid_io - zero_pages - orig_data_size - compr_data_size - mem_used_total By default, disksize is set to 0. So, to start using a zram device, fist write a disksize value and then initialize device by writing any positive value to initstate. For example: # initialize /dev/zram0 with 50MB disksize echo 50*1024*1024 | bc > /sys/block/zram0/disksize echo 1 > /sys/block/zram0/initstate When done using a disk, issue reset to free its memory by writing any positive value to reset node: echo 1 > /sys/block/zram0/reset This change also obviates the need for 'rzscontrol' utility. Signed-off-by: Nitin Gupta <ngupta@vflare.org> Acked-by: Pekka Enberg <penberg@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
parent
e1a164d7a3
commit
33863c21e6
6 changed files with 305 additions and 231 deletions
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@ -15,15 +15,3 @@ config ZRAM
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See zram.txt for more information.
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Project home: http://compcache.googlecode.com/
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config ZRAM_STATS
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bool "Enable statistics for compressed RAM disks"
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depends on ZRAM
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default y
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help
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Enable statistics collection for compressed RAM devices. Statistics
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are exported through ioctl interface, so you have to use zramconfig
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program to get them. This adds only a minimal overhead.
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If unsure, say Y.
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@ -1,3 +1,3 @@
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zram-objs := zram_drv.o xvmalloc.o
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zram-objs := zram_drv.o zram_sysfs.o xvmalloc.o
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obj-$(CONFIG_ZRAM) += zram.o
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@ -33,10 +33,39 @@
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/* Globals */
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static int zram_major;
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static struct zram *devices;
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struct zram *devices;
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/* Module params (documentation at end) */
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static unsigned int num_devices;
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unsigned int num_devices;
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static void zram_stat_inc(u32 *v)
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{
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*v = *v + 1;
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}
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static void zram_stat_dec(u32 *v)
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{
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*v = *v - 1;
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}
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static void zram_stat64_add(struct zram *zram, u64 *v, u64 inc)
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{
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spin_lock(&zram->stat64_lock);
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*v = *v + inc;
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spin_unlock(&zram->stat64_lock);
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}
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static void zram_stat64_sub(struct zram *zram, u64 *v, u64 dec)
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{
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spin_lock(&zram->stat64_lock);
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*v = *v - dec;
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spin_unlock(&zram->stat64_lock);
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}
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static void zram_stat64_inc(struct zram *zram, u64 *v)
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{
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zram_stat64_add(zram, v, 1);
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}
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static int zram_test_flag(struct zram *zram, u32 index,
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enum zram_pageflags flag)
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@ -91,7 +120,7 @@ static void zram_set_disksize(struct zram *zram, size_t totalram_bytes)
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"the disk when not in use so a huge zram is "
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"wasteful.\n"
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"\tMemory Size: %zu kB\n"
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"\tSize you selected: %zu kB\n"
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"\tSize you selected: %llu kB\n"
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"Continuing anyway ...\n",
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totalram_bytes >> 10, zram->disksize
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);
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@ -100,49 +129,6 @@ static void zram_set_disksize(struct zram *zram, size_t totalram_bytes)
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zram->disksize &= PAGE_MASK;
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}
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static void zram_ioctl_get_stats(struct zram *zram,
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struct zram_ioctl_stats *s)
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{
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s->disksize = zram->disksize;
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#if defined(CONFIG_ZRAM_STATS)
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{
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struct zram_stats *rs = &zram->stats;
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size_t succ_writes, mem_used;
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unsigned int good_compress_perc = 0, no_compress_perc = 0;
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mem_used = xv_get_total_size_bytes(zram->mem_pool)
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+ (rs->pages_expand << PAGE_SHIFT);
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succ_writes = zram_stat64_read(zram, &rs->num_writes) -
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zram_stat64_read(zram, &rs->failed_writes);
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if (succ_writes && rs->pages_stored) {
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good_compress_perc = rs->good_compress * 100
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/ rs->pages_stored;
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no_compress_perc = rs->pages_expand * 100
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/ rs->pages_stored;
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}
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s->num_reads = zram_stat64_read(zram, &rs->num_reads);
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s->num_writes = zram_stat64_read(zram, &rs->num_writes);
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s->failed_reads = zram_stat64_read(zram, &rs->failed_reads);
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s->failed_writes = zram_stat64_read(zram, &rs->failed_writes);
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s->invalid_io = zram_stat64_read(zram, &rs->invalid_io);
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s->notify_free = zram_stat64_read(zram, &rs->notify_free);
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s->pages_zero = rs->pages_zero;
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s->good_compress_pct = good_compress_perc;
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s->pages_expand_pct = no_compress_perc;
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s->pages_stored = rs->pages_stored;
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s->pages_used = mem_used >> PAGE_SHIFT;
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s->orig_data_size = rs->pages_stored << PAGE_SHIFT;
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s->compr_data_size = rs->compr_size;
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s->mem_used_total = mem_used;
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}
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#endif /* CONFIG_ZRAM_STATS */
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}
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static void zram_free_page(struct zram *zram, size_t index)
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{
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u32 clen;
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@ -180,7 +166,7 @@ static void zram_free_page(struct zram *zram, size_t index)
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zram_stat_dec(&zram->stats.good_compress);
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out:
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zram->stats.compr_size -= clen;
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zram_stat64_sub(zram, &zram->stats.compr_size, clen);
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zram_stat_dec(&zram->stats.pages_stored);
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zram->table[index].page = NULL;
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@ -396,7 +382,7 @@ memstore:
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kunmap_atomic(src, KM_USER0);
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/* Update stats */
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zram->stats.compr_size += clen;
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zram_stat64_add(zram, &zram->stats.compr_size, clen);
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zram_stat_inc(&zram->stats.pages_stored);
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if (clen <= PAGE_SIZE / 2)
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zram_stat_inc(&zram->stats.good_compress);
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@ -463,7 +449,7 @@ static int zram_make_request(struct request_queue *queue, struct bio *bio)
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return ret;
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}
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static void reset_device(struct zram *zram)
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void zram_reset_device(struct zram *zram)
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{
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size_t index;
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@ -506,7 +492,7 @@ static void reset_device(struct zram *zram)
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zram->disksize = 0;
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}
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static int zram_ioctl_init_device(struct zram *zram)
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int zram_init_device(struct zram *zram)
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{
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int ret;
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size_t num_pages;
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@ -561,91 +547,12 @@ static int zram_ioctl_init_device(struct zram *zram)
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return 0;
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fail:
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reset_device(zram);
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zram_reset_device(zram);
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pr_err("Initialization failed: err=%d\n", ret);
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return ret;
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}
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static int zram_ioctl_reset_device(struct zram *zram)
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{
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if (zram->init_done)
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reset_device(zram);
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return 0;
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}
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static int zram_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg)
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{
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int ret = 0;
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size_t disksize_kb;
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struct zram *zram = bdev->bd_disk->private_data;
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switch (cmd) {
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case ZRAMIO_SET_DISKSIZE_KB:
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if (zram->init_done) {
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ret = -EBUSY;
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goto out;
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}
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if (copy_from_user(&disksize_kb, (void *)arg,
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_IOC_SIZE(cmd))) {
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ret = -EFAULT;
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goto out;
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}
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zram->disksize = disksize_kb << 10;
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pr_info("Disk size set to %zu kB\n", disksize_kb);
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break;
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case ZRAMIO_GET_STATS:
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{
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struct zram_ioctl_stats *stats;
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if (!zram->init_done) {
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ret = -ENOTTY;
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goto out;
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}
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stats = kzalloc(sizeof(*stats), GFP_KERNEL);
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if (!stats) {
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ret = -ENOMEM;
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goto out;
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}
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zram_ioctl_get_stats(zram, stats);
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if (copy_to_user((void *)arg, stats, sizeof(*stats))) {
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kfree(stats);
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ret = -EFAULT;
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goto out;
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}
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kfree(stats);
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break;
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}
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case ZRAMIO_INIT:
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ret = zram_ioctl_init_device(zram);
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break;
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case ZRAMIO_RESET:
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/* Do not reset an active device! */
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if (bdev->bd_holders) {
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ret = -EBUSY;
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goto out;
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}
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/* Make sure all pending I/O is finished */
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if (bdev)
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fsync_bdev(bdev);
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ret = zram_ioctl_reset_device(zram);
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break;
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default:
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pr_info("Invalid ioctl %u\n", cmd);
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ret = -ENOTTY;
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}
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out:
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return ret;
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}
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void zram_slot_free_notify(struct block_device *bdev, unsigned long index)
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{
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struct zram *zram;
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}
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static const struct block_device_operations zram_devops = {
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.ioctl = zram_ioctl,
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.swap_slot_free_notify = zram_slot_free_notify,
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.owner = THIS_MODULE
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};
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zram->disk->private_data = zram;
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snprintf(zram->disk->disk_name, 16, "zram%d", device_id);
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/* Actual capacity set using ZRAMIO_SET_DISKSIZE_KB ioctl */
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/* Actual capacity set using syfs (/sys/block/zram<id>/disksize */
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set_capacity(zram->disk, 0);
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/*
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add_disk(zram->disk);
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#ifdef CONFIG_SYSFS
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ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj,
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&zram_disk_attr_group);
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if (ret < 0) {
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pr_warning("Error creating sysfs group");
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goto out;
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}
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#endif
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zram->init_done = 0;
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out:
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static void destroy_device(struct zram *zram)
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{
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#ifdef CONFIG_SYSFS
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sysfs_remove_group(&disk_to_dev(zram->disk)->kobj,
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&zram_disk_attr_group);
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#endif
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if (zram->disk) {
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del_gendisk(zram->disk);
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put_disk(zram->disk);
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@ -785,7 +705,7 @@ static void __exit zram_exit(void)
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destroy_device(zram);
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if (zram->init_done)
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reset_device(zram);
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zram_reset_device(zram);
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}
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unregister_blkdev(zram_major, "zram");
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@ -18,7 +18,6 @@
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include "zram_ioctl.h"
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#include "xvmalloc.h"
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/*
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@ -85,11 +84,7 @@ struct table {
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} __attribute__((aligned(4)));
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struct zram_stats {
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/* basic stats */
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size_t compr_size; /* compressed size of pages stored -
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* needed to enforce memlimit */
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/* more stats */
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#if defined(CONFIG_ZRAM_STATS)
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u64 compr_size; /* compressed size of pages stored */
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u64 num_reads; /* failed + successful */
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u64 num_writes; /* --do-- */
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u64 failed_reads; /* should NEVER! happen */
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@ -100,7 +95,6 @@ struct zram_stats {
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u32 pages_stored; /* no. of pages currently stored */
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u32 good_compress; /* % of pages with compression ratio<=50% */
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u32 pages_expand; /* % of incompressible pages */
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#endif
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};
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struct zram {
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@ -118,47 +112,18 @@ struct zram {
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* This is the limit on amount of *uncompressed* worth of data
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* we can store in a disk.
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*/
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size_t disksize; /* bytes */
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u64 disksize; /* bytes */
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struct zram_stats stats;
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};
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/*-- */
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extern struct zram *devices;
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extern unsigned int num_devices;
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#ifdef CONFIG_SYSFS
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extern struct attribute_group zram_disk_attr_group;
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#endif
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/* Debugging and Stats */
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#if defined(CONFIG_ZRAM_STATS)
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static void zram_stat_inc(u32 *v)
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{
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*v = *v + 1;
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}
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static void zram_stat_dec(u32 *v)
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{
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*v = *v - 1;
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}
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static void zram_stat64_inc(struct zram *zram, u64 *v)
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{
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spin_lock(&zram->stat64_lock);
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*v = *v + 1;
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spin_unlock(&zram->stat64_lock);
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}
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static u64 zram_stat64_read(struct zram *zram, u64 *v)
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{
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u64 val;
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spin_lock(&zram->stat64_lock);
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val = *v;
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spin_unlock(&zram->stat64_lock);
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return val;
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}
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#else
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#define zram_stat_inc(v)
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#define zram_stat_dec(v)
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#define zram_stat64_inc(r, v)
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#define zram_stat64_read(r, v)
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#endif /* CONFIG_ZRAM_STATS */
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extern int zram_init_device(struct zram *zram);
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extern void zram_reset_device(struct zram *zram);
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#endif
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@ -1,41 +0,0 @@
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/*
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* Compressed RAM block device
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*
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* Copyright (C) 2008, 2009, 2010 Nitin Gupta
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*
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* This code is released using a dual license strategy: BSD/GPL
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* You can choose the licence that better fits your requirements.
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*
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* Released under the terms of 3-clause BSD License
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* Released under the terms of GNU General Public License Version 2.0
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*
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* Project home: http://compcache.googlecode.com
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*/
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#ifndef _ZRAM_IOCTL_H_
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#define _ZRAM_IOCTL_H_
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struct zram_ioctl_stats {
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u64 disksize; /* disksize in bytes (user specifies in KB) */
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u64 num_reads; /* failed + successful */
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u64 num_writes; /* --do-- */
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u64 failed_reads; /* should NEVER! happen */
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u64 failed_writes; /* can happen when memory is too low */
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u64 invalid_io; /* non-page-aligned I/O requests */
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u64 notify_free; /* no. of swap slot free notifications */
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u32 pages_zero; /* no. of zero filled pages */
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u32 good_compress_pct; /* no. of pages with compression ratio<=50% */
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u32 pages_expand_pct; /* no. of incompressible pages */
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u32 pages_stored;
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u32 pages_used;
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u64 orig_data_size;
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u64 compr_data_size;
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u64 mem_used_total;
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} __attribute__ ((packed, aligned(4)));
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#define ZRAMIO_SET_DISKSIZE_KB _IOW('z', 0, size_t)
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#define ZRAMIO_GET_STATS _IOR('z', 1, struct zram_ioctl_stats)
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#define ZRAMIO_INIT _IO('z', 2)
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#define ZRAMIO_RESET _IO('z', 3)
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#endif
|
242
drivers/staging/zram/zram_sysfs.c
Normal file
242
drivers/staging/zram/zram_sysfs.c
Normal file
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@ -0,0 +1,242 @@
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/*
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* Compressed RAM block device
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*
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* Copyright (C) 2008, 2009, 2010 Nitin Gupta
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*
|
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* This code is released using a dual license strategy: BSD/GPL
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* You can choose the licence that better fits your requirements.
|
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*
|
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* Released under the terms of 3-clause BSD License
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* Released under the terms of GNU General Public License Version 2.0
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*
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* Project home: http://compcache.googlecode.com/
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*/
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#include <linux/device.h>
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#include <linux/genhd.h>
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#include "zram_drv.h"
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#ifdef CONFIG_SYSFS
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|
||||
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)
|
||||
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 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);
|
||||
|
||||
ret = strict_strtoul(buf, 10, &do_init);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (!do_init)
|
||||
return -EINVAL;
|
||||
|
||||
zram_init_device(zram);
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
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_IWUGO,
|
||||
disksize_show, disksize_store);
|
||||
static DEVICE_ATTR(initstate, S_IRUGO | S_IWUGO,
|
||||
initstate_show, initstate_store);
|
||||
static DEVICE_ATTR(reset, S_IWUGO, 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 */
|
Loading…
Add table
Reference in a new issue