cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dm-region-hash.h (3182B)

      1/*
      2 * Copyright (C) 2003 Sistina Software Limited.
      3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
      4 *
      5 * Device-Mapper dirty region hash interface.
      6 *
      7 * This file is released under the GPL.
      8 */
      9
     10#ifndef DM_REGION_HASH_H
     11#define DM_REGION_HASH_H
     12
     13#include <linux/dm-dirty-log.h>
     14
     15/*-----------------------------------------------------------------
     16 * Region hash
     17 *----------------------------------------------------------------*/
     18struct dm_region_hash;
     19struct dm_region;
     20
     21/*
     22 * States a region can have.
     23 */
     24enum dm_rh_region_states {
     25	DM_RH_CLEAN	 = 0x01,	/* No writes in flight. */
     26	DM_RH_DIRTY	 = 0x02,	/* Writes in flight. */
     27	DM_RH_NOSYNC	 = 0x04,	/* Out of sync. */
     28	DM_RH_RECOVERING = 0x08,	/* Under resynchronization. */
     29};
     30
     31/*
     32 * Region hash create/destroy.
     33 */
     34struct bio_list;
     35struct dm_region_hash *dm_region_hash_create(
     36		void *context, void (*dispatch_bios)(void *context,
     37						     struct bio_list *bios),
     38		void (*wakeup_workers)(void *context),
     39		void (*wakeup_all_recovery_waiters)(void *context),
     40		sector_t target_begin, unsigned max_recovery,
     41		struct dm_dirty_log *log, uint32_t region_size,
     42		region_t nr_regions);
     43void dm_region_hash_destroy(struct dm_region_hash *rh);
     44
     45struct dm_dirty_log *dm_rh_dirty_log(struct dm_region_hash *rh);
     46
     47/*
     48 * Conversion functions.
     49 */
     50region_t dm_rh_bio_to_region(struct dm_region_hash *rh, struct bio *bio);
     51sector_t dm_rh_region_to_sector(struct dm_region_hash *rh, region_t region);
     52void *dm_rh_region_context(struct dm_region *reg);
     53
     54/*
     55 * Get region size and key (ie. number of the region).
     56 */
     57sector_t dm_rh_get_region_size(struct dm_region_hash *rh);
     58region_t dm_rh_get_region_key(struct dm_region *reg);
     59
     60/*
     61 * Get/set/update region state (and dirty log).
     62 *
     63 */
     64int dm_rh_get_state(struct dm_region_hash *rh, region_t region, int may_block);
     65void dm_rh_set_state(struct dm_region_hash *rh, region_t region,
     66		     enum dm_rh_region_states state, int may_block);
     67
     68/* Non-zero errors_handled leaves the state of the region NOSYNC */
     69void dm_rh_update_states(struct dm_region_hash *rh, int errors_handled);
     70
     71/* Flush the region hash and dirty log. */
     72int dm_rh_flush(struct dm_region_hash *rh);
     73
     74/* Inc/dec pending count on regions. */
     75void dm_rh_inc_pending(struct dm_region_hash *rh, struct bio_list *bios);
     76void dm_rh_dec(struct dm_region_hash *rh, region_t region);
     77
     78/* Delay bios on regions. */
     79void dm_rh_delay(struct dm_region_hash *rh, struct bio *bio);
     80
     81void dm_rh_mark_nosync(struct dm_region_hash *rh, struct bio *bio);
     82
     83/*
     84 * Region recovery control.
     85 */
     86
     87/* Prepare some regions for recovery by starting to quiesce them. */
     88void dm_rh_recovery_prepare(struct dm_region_hash *rh);
     89
     90/* Try fetching a quiesced region for recovery. */
     91struct dm_region *dm_rh_recovery_start(struct dm_region_hash *rh);
     92
     93/* Report recovery end on a region. */
     94void dm_rh_recovery_end(struct dm_region *reg, int error);
     95
     96/* Returns number of regions with recovery work outstanding. */
     97int dm_rh_recovery_in_flight(struct dm_region_hash *rh);
     98
     99/* Start/stop recovery. */
    100void dm_rh_start_recovery(struct dm_region_hash *rh);
    101void dm_rh_stop_recovery(struct dm_region_hash *rh);
    102
    103#endif /* DM_REGION_HASH_H */