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/*
* Compressed RAM based swap 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
*/
#ifndef _RAMZSWAP_IOCTL_H_
#define _RAMZSWAP_IOCTL_H_
struct ramzswap_ioctl_stats {
u64 disksize; /* user specified or equal to backing swap
* size (if present) */
u64 num_reads; /* failed + successful */
u64 num_writes; /* --do-- */
u64 failed_reads; /* should NEVER! happen */
u64 failed_writes; /* can happen when memory is too low */
u64 invalid_io; /* non-swap I/O requests */
u64 notify_free; /* no. of swap slot free notifications */
u32 pages_zero; /* no. of zero filled pages */
u32 good_compress_pct; /* no. of pages with compression ratio<=50% */
u32 pages_expand_pct; /* no. of incompressible pages */
u32 pages_stored;
u32 pages_used;
u64 orig_data_size;
u64 compr_data_size;
u64 mem_used_total;
} __attribute__ ((packed, aligned(4)));
#define RZSIO_SET_DISKSIZE_KB _IOW('z', 0, size_t)
#define RZSIO_GET_STATS _IOR('z', 1, struct ramzswap_ioctl_stats)
#define RZSIO_INIT _IO('z', 2)
#define RZSIO_RESET _IO('z', 3)
#endif
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