diff options
Diffstat (limited to 'drivers/staging/zram/zram_ioctl.h')
| -rw-r--r-- | drivers/staging/zram/zram_ioctl.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/staging/zram/zram_ioctl.h b/drivers/staging/zram/zram_ioctl.h new file mode 100644 index 000000000000..5c415fa4f17b --- /dev/null +++ b/drivers/staging/zram/zram_ioctl.h @@ -0,0 +1,41 @@ +/* + * 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 + */ + +#ifndef _ZRAM_IOCTL_H_ +#define _ZRAM_IOCTL_H_ + +struct zram_ioctl_stats { + u64 disksize; /* disksize in bytes (user specifies in KB) */ + 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-page-aligned 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 ZRAMIO_SET_DISKSIZE_KB _IOW('z', 0, size_t) +#define ZRAMIO_GET_STATS _IOR('z', 1, struct zram_ioctl_stats) +#define ZRAMIO_INIT _IO('z', 2) +#define ZRAMIO_RESET _IO('z', 3) + +#endif |