diff options
Diffstat (limited to 'drivers/staging/ramzswap/ramzswap_ioctl.h')
| -rw-r--r-- | drivers/staging/ramzswap/ramzswap_ioctl.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/staging/ramzswap/ramzswap_ioctl.h b/drivers/staging/ramzswap/ramzswap_ioctl.h new file mode 100644 index 000000000000..c713a09af580 --- /dev/null +++ b/drivers/staging/ramzswap/ramzswap_ioctl.h @@ -0,0 +1,49 @@ +/* + * Compressed RAM based swap device + * + * Copyright (C) 2008, 2009 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_ + +#define MAX_SWAP_NAME_LEN 128 + +struct ramzswap_ioctl_stats { + char backing_swap_name[MAX_SWAP_NAME_LEN]; + u64 memlimit; /* only applicable if backing swap present */ + u64 disksize; /* user specified or equal to backing swap + * size (if present) */ + u64 num_reads; /* failed + successful */ + u64 num_writes; /* --do-- */ + u64 failed_reads; /* can happen when memory is too low */ + u64 failed_writes; /* should NEVER! happen */ + u64 invalid_io; /* non-swap I/O requests */ + 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; + u64 bdev_num_reads; /* no. of reads on backing dev */ + u64 bdev_num_writes; /* no. of writes on backing dev */ +} __attribute__ ((packed, aligned(4))); + +#define RZSIO_SET_DISKSIZE_KB _IOW('z', 0, size_t) +#define RZSIO_SET_MEMLIMIT_KB _IOW('z', 1, size_t) +#define RZSIO_SET_BACKING_SWAP _IOW('z', 2, unsigned char[MAX_SWAP_NAME_LEN]) +#define RZSIO_GET_STATS _IOR('z', 3, struct ramzswap_ioctl_stats) +#define RZSIO_INIT _IO('z', 4) +#define RZSIO_RESET _IO('z', 5) + +#endif |