raid5-ppl: PPL support for disks with write-back cache enabled
[sfrench/cifs-2.6.git] / drivers / md / raid5-log.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _RAID5_LOG_H
3 #define _RAID5_LOG_H
4
5 extern int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev);
6 extern void r5l_exit_log(struct r5conf *conf);
7 extern int r5l_write_stripe(struct r5l_log *log, struct stripe_head *head_sh);
8 extern void r5l_write_stripe_run(struct r5l_log *log);
9 extern void r5l_flush_stripe_to_raid(struct r5l_log *log);
10 extern void r5l_stripe_write_finished(struct stripe_head *sh);
11 extern int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio);
12 extern void r5l_quiesce(struct r5l_log *log, int quiesce);
13 extern bool r5l_log_disk_error(struct r5conf *conf);
14 extern bool r5c_is_writeback(struct r5l_log *log);
15 extern int
16 r5c_try_caching_write(struct r5conf *conf, struct stripe_head *sh,
17                       struct stripe_head_state *s, int disks);
18 extern void
19 r5c_finish_stripe_write_out(struct r5conf *conf, struct stripe_head *sh,
20                             struct stripe_head_state *s);
21 extern void r5c_release_extra_page(struct stripe_head *sh);
22 extern void r5c_use_extra_page(struct stripe_head *sh);
23 extern void r5l_wake_reclaim(struct r5l_log *log, sector_t space);
24 extern void r5c_handle_cached_data_endio(struct r5conf *conf,
25         struct stripe_head *sh, int disks);
26 extern int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh);
27 extern void r5c_make_stripe_write_out(struct stripe_head *sh);
28 extern void r5c_flush_cache(struct r5conf *conf, int num);
29 extern void r5c_check_stripe_cache_usage(struct r5conf *conf);
30 extern void r5c_check_cached_full_stripe(struct r5conf *conf);
31 extern struct md_sysfs_entry r5c_journal_mode;
32 extern void r5c_update_on_rdev_error(struct mddev *mddev,
33                                      struct md_rdev *rdev);
34 extern bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect);
35 extern int r5l_start(struct r5l_log *log);
36
37 extern struct dma_async_tx_descriptor *
38 ops_run_partial_parity(struct stripe_head *sh, struct raid5_percpu *percpu,
39                        struct dma_async_tx_descriptor *tx);
40 extern int ppl_init_log(struct r5conf *conf);
41 extern void ppl_exit_log(struct r5conf *conf);
42 extern int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh);
43 extern void ppl_write_stripe_run(struct r5conf *conf);
44 extern void ppl_stripe_write_finished(struct stripe_head *sh);
45 extern int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add);
46 extern void ppl_quiesce(struct r5conf *conf, int quiesce);
47
48 static inline bool raid5_has_ppl(struct r5conf *conf)
49 {
50         return test_bit(MD_HAS_PPL, &conf->mddev->flags);
51 }
52
53 static inline int log_stripe(struct stripe_head *sh, struct stripe_head_state *s)
54 {
55         struct r5conf *conf = sh->raid_conf;
56
57         if (conf->log) {
58                 if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) {
59                         /* writing out phase */
60                         if (s->waiting_extra_page)
61                                 return 0;
62                         return r5l_write_stripe(conf->log, sh);
63                 } else if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) {
64                         /* caching phase */
65                         return r5c_cache_data(conf->log, sh);
66                 }
67         } else if (raid5_has_ppl(conf)) {
68                 return ppl_write_stripe(conf, sh);
69         }
70
71         return -EAGAIN;
72 }
73
74 static inline void log_stripe_write_finished(struct stripe_head *sh)
75 {
76         struct r5conf *conf = sh->raid_conf;
77
78         if (conf->log)
79                 r5l_stripe_write_finished(sh);
80         else if (raid5_has_ppl(conf))
81                 ppl_stripe_write_finished(sh);
82 }
83
84 static inline void log_write_stripe_run(struct r5conf *conf)
85 {
86         if (conf->log)
87                 r5l_write_stripe_run(conf->log);
88         else if (raid5_has_ppl(conf))
89                 ppl_write_stripe_run(conf);
90 }
91
92 static inline void log_flush_stripe_to_raid(struct r5conf *conf)
93 {
94         if (conf->log)
95                 r5l_flush_stripe_to_raid(conf->log);
96         else if (raid5_has_ppl(conf))
97                 ppl_write_stripe_run(conf);
98 }
99
100 static inline int log_handle_flush_request(struct r5conf *conf, struct bio *bio)
101 {
102         int ret = -ENODEV;
103
104         if (conf->log)
105                 ret = r5l_handle_flush_request(conf->log, bio);
106         else if (raid5_has_ppl(conf))
107                 ret = 0;
108
109         return ret;
110 }
111
112 static inline void log_quiesce(struct r5conf *conf, int quiesce)
113 {
114         if (conf->log)
115                 r5l_quiesce(conf->log, quiesce);
116         else if (raid5_has_ppl(conf))
117                 ppl_quiesce(conf, quiesce);
118 }
119
120 static inline void log_exit(struct r5conf *conf)
121 {
122         if (conf->log)
123                 r5l_exit_log(conf);
124         else if (raid5_has_ppl(conf))
125                 ppl_exit_log(conf);
126 }
127
128 static inline int log_init(struct r5conf *conf, struct md_rdev *journal_dev,
129                            bool ppl)
130 {
131         if (journal_dev)
132                 return r5l_init_log(conf, journal_dev);
133         else if (ppl)
134                 return ppl_init_log(conf);
135
136         return 0;
137 }
138
139 static inline int log_modify(struct r5conf *conf, struct md_rdev *rdev, bool add)
140 {
141         if (raid5_has_ppl(conf))
142                 return ppl_modify_log(conf, rdev, add);
143
144         return 0;
145 }
146
147 #endif