| 1 |
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| 2 | #ifndef _PCACHE_CACHE_DEV_H
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| 3 | #define _PCACHE_CACHE_DEV_H
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| 4 |
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| 5 | #include <linux/device.h>
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| 6 | #include <linux/device-mapper.h>
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| 7 |
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| 8 | #include "pcache_internal.h"
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| 9 |
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| 10 | #define PCACHE_MAGIC 0x65B05EFA96C596EFULL
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| 11 |
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| 12 | #define PCACHE_SB_OFF (4 * PCACHE_KB)
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| 13 | #define PCACHE_SB_SIZE (4 * PCACHE_KB)
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| 14 |
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| 15 | #define PCACHE_CACHE_INFO_OFF (PCACHE_SB_OFF + PCACHE_SB_SIZE)
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| 16 | #define PCACHE_CACHE_INFO_SIZE (4 * PCACHE_KB)
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| 17 |
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| 18 | #define PCACHE_CACHE_CTRL_OFF (PCACHE_CACHE_INFO_OFF + (PCACHE_CACHE_INFO_SIZE * PCACHE_META_INDEX_MAX))
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| 19 | #define PCACHE_CACHE_CTRL_SIZE (4 * PCACHE_KB)
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| 20 |
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| 21 | #define PCACHE_SEGMENTS_OFF (PCACHE_CACHE_CTRL_OFF + PCACHE_CACHE_CTRL_SIZE)
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| 22 | #define PCACHE_SEG_INFO_SIZE (4 * PCACHE_KB)
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| 23 |
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| 24 | #define PCACHE_CACHE_DEV_SIZE_MIN (512 * PCACHE_MB)
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| 25 | #define PCACHE_SEG_SIZE (16 * PCACHE_MB)
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| 26 |
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| 27 | #define CACHE_DEV_SB(cache_dev) ((struct pcache_sb *)(cache_dev->mapping + PCACHE_SB_OFF))
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| 28 | #define CACHE_DEV_CACHE_INFO(cache_dev) ((void *)cache_dev->mapping + PCACHE_CACHE_INFO_OFF)
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| 29 | #define CACHE_DEV_CACHE_CTRL(cache_dev) ((void *)cache_dev->mapping + PCACHE_CACHE_CTRL_OFF)
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| 30 | #define CACHE_DEV_SEGMENTS(cache_dev) ((void *)cache_dev->mapping + PCACHE_SEGMENTS_OFF)
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| 31 | #define CACHE_DEV_SEGMENT(cache_dev, id) ((void *)CACHE_DEV_SEGMENTS(cache_dev) + (u64)id * PCACHE_SEG_SIZE)
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| 32 |
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| 33 | |
| 34 | * PCACHE SB flags configured during formatting
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| 35 | *
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| 36 | * The PCACHE_SB_F_xxx flags define registration requirements based on cache_dev
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| 37 | * formatting. For a machine to register a cache_dev:
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| 38 | * - PCACHE_SB_F_BIGENDIAN: Requires a big-endian machine.
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| 39 |
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| 40 | #define PCACHE_SB_F_BIGENDIAN BIT(0)
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| 41 |
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| 42 | struct pcache_sb {
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| 43 | __le32 crc;
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| 44 | __le32 flags;
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| 45 | __le64 magic;
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| 46 |
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| 47 | __le32 seg_num;
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| 48 | };
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| 49 |
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| 50 | struct pcache_cache_dev {
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| 51 | u32 sb_flags;
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| 52 | u32 seg_num;
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| 53 | void *mapping;
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| 54 | bool use_vmap;
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| 55 |
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| 56 | struct dm_dev *dm_dev;
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| 57 |
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| 58 | struct mutex seg_lock;
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| 59 | unsigned long *seg_bitmap;
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| 60 | };
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| 61 |
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| 62 | struct dm_pcache;
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| 63 | int cache_dev_start(struct dm_pcache *pcache);
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| 64 | void cache_dev_stop(struct dm_pcache *pcache);
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| 65 |
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| 66 | void cache_dev_zero_range(struct pcache_cache_dev *cache_dev, void *pos, u32 size);
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| 67 |
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| 68 | int cache_dev_get_empty_segment_id(struct pcache_cache_dev *cache_dev, u32 *seg_id);
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| 69 |
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| 70 | #endif
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