Merge branch 'l2x0-pull-rmk' of git://dev.omapzoom.org/pub/scm/santosh/kernel-omap4...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / zram / zram_ioctl.h
blob5c415fa4f17bb599a9e1c445dbd41787ef7e0974
1 /*
2 * Compressed RAM block device
4 * Copyright (C) 2008, 2009, 2010 Nitin Gupta
6 * This code is released using a dual license strategy: BSD/GPL
7 * You can choose the licence that better fits your requirements.
9 * Released under the terms of 3-clause BSD License
10 * Released under the terms of GNU General Public License Version 2.0
12 * Project home: http://compcache.googlecode.com
15 #ifndef _ZRAM_IOCTL_H_
16 #define _ZRAM_IOCTL_H_
18 struct zram_ioctl_stats {
19 u64 disksize; /* disksize in bytes (user specifies in KB) */
20 u64 num_reads; /* failed + successful */
21 u64 num_writes; /* --do-- */
22 u64 failed_reads; /* should NEVER! happen */
23 u64 failed_writes; /* can happen when memory is too low */
24 u64 invalid_io; /* non-page-aligned I/O requests */
25 u64 notify_free; /* no. of swap slot free notifications */
26 u32 pages_zero; /* no. of zero filled pages */
27 u32 good_compress_pct; /* no. of pages with compression ratio<=50% */
28 u32 pages_expand_pct; /* no. of incompressible pages */
29 u32 pages_stored;
30 u32 pages_used;
31 u64 orig_data_size;
32 u64 compr_data_size;
33 u64 mem_used_total;
34 } __attribute__ ((packed, aligned(4)));
36 #define ZRAMIO_SET_DISKSIZE_KB _IOW('z', 0, size_t)
37 #define ZRAMIO_GET_STATS _IOR('z', 1, struct zram_ioctl_stats)
38 #define ZRAMIO_INIT _IO('z', 2)
39 #define ZRAMIO_RESET _IO('z', 3)
41 #endif