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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 | *----------------------------------------------------------------*/ |
18 | struct dm_region_hash; |
19 | struct dm_region; |
20 | |
21 | /* |
22 | * States a region can have. |
23 | */ |
24 | enum 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 | */ |
34 | struct bio_list; |
35 | struct 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); |
43 | void dm_region_hash_destroy(struct dm_region_hash *rh); |
44 | |
45 | struct dm_dirty_log *dm_rh_dirty_log(struct dm_region_hash *rh); |
46 | |
47 | /* |
48 | * Conversion functions. |
49 | */ |
50 | region_t dm_rh_bio_to_region(struct dm_region_hash *rh, struct bio *bio); |
51 | sector_t dm_rh_region_to_sector(struct dm_region_hash *rh, region_t region); |
52 | void *dm_rh_region_context(struct dm_region *reg); |
53 | |
54 | /* |
55 | * Get region size and key (ie. number of the region). |
56 | */ |
57 | sector_t dm_rh_get_region_size(struct dm_region_hash *rh); |
58 | region_t dm_rh_get_region_key(struct dm_region *reg); |
59 | |
60 | /* |
61 | * Get/set/update region state (and dirty log). |
62 | * |
63 | */ |
64 | int dm_rh_get_state(struct dm_region_hash *rh, region_t region, int may_block); |
65 | void 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 */ |
69 | void dm_rh_update_states(struct dm_region_hash *rh, int errors_handled); |
70 | |
71 | /* Flush the region hash and dirty log. */ |
72 | int dm_rh_flush(struct dm_region_hash *rh); |
73 | |
74 | /* Inc/dec pending count on regions. */ |
75 | void dm_rh_inc_pending(struct dm_region_hash *rh, struct bio_list *bios); |
76 | void dm_rh_dec(struct dm_region_hash *rh, region_t region); |
77 | |
78 | /* Delay bios on regions. */ |
79 | void dm_rh_delay(struct dm_region_hash *rh, struct bio *bio); |
80 | |
81 | void 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. */ |
88 | void dm_rh_recovery_prepare(struct dm_region_hash *rh); |
89 | |
90 | /* Try fetching a quiesced region for recovery. */ |
91 | struct dm_region *dm_rh_recovery_start(struct dm_region_hash *rh); |
92 | |
93 | /* Report recovery end on a region. */ |
94 | void dm_rh_recovery_end(struct dm_region *reg, int error); |
95 | |
96 | /* Returns number of regions with recovery work outstanding. */ |
97 | int dm_rh_recovery_in_flight(struct dm_region_hash *rh); |
98 | |
99 | /* Start/stop recovery. */ |
100 | void dm_rh_start_recovery(struct dm_region_hash *rh); |
101 | void dm_rh_stop_recovery(struct dm_region_hash *rh); |
102 | |
103 | #endif /* DM_REGION_HASH_H */ |
104 |
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