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| -rw-r--r-- | include/linux/zram_drv.h | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/include/linux/zram_drv.h b/include/linux/zram_drv.h deleted file mode 100644 index 3cca0003a..000000000 --- a/include/linux/zram_drv.h +++ /dev/null @@ -1,108 +0,0 @@ -/* - * Compressed RAM block device - * - * Copyright (C) 2008, 2009, 2010 Nitin Gupta - * 2012, 2013 Minchan Kim - * - * 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 - * - */ - -#ifndef _ZRAM_DRV_H_ -#define _ZRAM_DRV_H_ - -#include <linux/spinlock.h> -#include <linux/zsmalloc.h> - -#include "zcomp.h" - -/* - * Some arbitrary value. This is just to catch - * invalid value for num_devices module parameter. - */ -static const unsigned max_num_devices = 32; - -/*-- Configurable parameters */ - -/* - * Pages that compress to size greater than this are stored - * uncompressed in memory. - */ -static const size_t max_zpage_size = PAGE_SIZE / 4 * 3; - -/* - * NOTE: max_zpage_size must be less than or equal to: - * ZS_MAX_ALLOC_SIZE. Otherwise, zs_malloc() would - * always return failure. - */ - -/*-- End of configurable params */ - -#define SECTOR_SHIFT 9 -#define SECTOR_SIZE (1 << SECTOR_SHIFT) -#define SECTORS_PER_PAGE_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) -#define SECTORS_PER_PAGE (1 << SECTORS_PER_PAGE_SHIFT) -#define ZRAM_LOGICAL_BLOCK_SHIFT 12 -#define ZRAM_LOGICAL_BLOCK_SIZE (1 << ZRAM_LOGICAL_BLOCK_SHIFT) -#define ZRAM_SECTOR_PER_LOGICAL_BLOCK \ - (1 << (ZRAM_LOGICAL_BLOCK_SHIFT - SECTOR_SHIFT)) - -/* Flags for zram pages (table[page_no].flags) */ -enum zram_pageflags { - /* Page consists entirely of zeros */ - ZRAM_ZERO, - - __NR_ZRAM_PAGEFLAGS, -}; - -/*-- Data structures */ - -/* Allocated for each disk page */ -struct table { - unsigned long handle; - u16 size; /* object size (excluding header) */ - u8 flags; -} __aligned(4); - -struct zram_stats { - atomic64_t compr_data_size; /* compressed size of pages stored */ - atomic64_t num_reads; /* failed + successful */ - atomic64_t num_writes; /* --do-- */ - atomic64_t failed_reads; /* should NEVER! happen */ - atomic64_t failed_writes; /* can happen when memory is too low */ - atomic64_t invalid_io; /* non-page-aligned I/O requests */ - atomic64_t notify_free; /* no. of swap slot free notifications */ - atomic64_t zero_pages; /* no. of zero filled pages */ - atomic64_t pages_stored; /* no. of pages currently stored */ -}; - -struct zram_meta { - rwlock_t tb_lock; /* protect table */ - struct table *table; - struct zs_pool *mem_pool; -}; - -struct zram { - struct zram_meta *meta; - struct request_queue *queue; - struct gendisk *disk; - struct zcomp *comp; - - /* Prevent concurrent execution of device init, reset and R/W request */ - struct rw_semaphore init_lock; - /* - * This is the limit on amount of *uncompressed* worth of data - * we can store in a disk. - */ - u64 disksize; /* bytes */ - int max_comp_streams; - struct zram_stats stats; - char compressor[10]; -}; - -extern struct zram *zram_devices; -#endif |