]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/md/raid5-log.h
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[karo-tx-linux.git] / drivers / md / raid5-log.h
1 #ifndef _RAID5_LOG_H
2 #define _RAID5_LOG_H
3
4 extern int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev);
5 extern void r5l_exit_log(struct r5conf *conf);
6 extern int r5l_write_stripe(struct r5l_log *log, struct stripe_head *head_sh);
7 extern void r5l_write_stripe_run(struct r5l_log *log);
8 extern void r5l_flush_stripe_to_raid(struct r5l_log *log);
9 extern void r5l_stripe_write_finished(struct stripe_head *sh);
10 extern int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio);
11 extern void r5l_quiesce(struct r5l_log *log, int state);
12 extern bool r5l_log_disk_error(struct r5conf *conf);
13 extern bool r5c_is_writeback(struct r5l_log *log);
14 extern int
15 r5c_try_caching_write(struct r5conf *conf, struct stripe_head *sh,
16                       struct stripe_head_state *s, int disks);
17 extern void
18 r5c_finish_stripe_write_out(struct r5conf *conf, struct stripe_head *sh,
19                             struct stripe_head_state *s);
20 extern void r5c_release_extra_page(struct stripe_head *sh);
21 extern void r5c_use_extra_page(struct stripe_head *sh);
22 extern void r5l_wake_reclaim(struct r5l_log *log, sector_t space);
23 extern void r5c_handle_cached_data_endio(struct r5conf *conf,
24         struct stripe_head *sh, int disks);
25 extern int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh);
26 extern void r5c_make_stripe_write_out(struct stripe_head *sh);
27 extern void r5c_flush_cache(struct r5conf *conf, int num);
28 extern void r5c_check_stripe_cache_usage(struct r5conf *conf);
29 extern void r5c_check_cached_full_stripe(struct r5conf *conf);
30 extern struct md_sysfs_entry r5c_journal_mode;
31 extern void r5c_update_on_rdev_error(struct mddev *mddev,
32                                      struct md_rdev *rdev);
33 extern bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect);
34
35 extern struct dma_async_tx_descriptor *
36 ops_run_partial_parity(struct stripe_head *sh, struct raid5_percpu *percpu,
37                        struct dma_async_tx_descriptor *tx);
38 extern int ppl_init_log(struct r5conf *conf);
39 extern void ppl_exit_log(struct r5conf *conf);
40 extern int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh);
41 extern void ppl_write_stripe_run(struct r5conf *conf);
42 extern void ppl_stripe_write_finished(struct stripe_head *sh);
43 extern int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add);
44
45 static inline bool raid5_has_ppl(struct r5conf *conf)
46 {
47         return test_bit(MD_HAS_PPL, &conf->mddev->flags);
48 }
49
50 static inline int log_stripe(struct stripe_head *sh, struct stripe_head_state *s)
51 {
52         struct r5conf *conf = sh->raid_conf;
53
54         if (conf->log) {
55                 if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) {
56                         /* writing out phase */
57                         if (s->waiting_extra_page)
58                                 return 0;
59                         return r5l_write_stripe(conf->log, sh);
60                 } else if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) {
61                         /* caching phase */
62                         return r5c_cache_data(conf->log, sh);
63                 }
64         } else if (raid5_has_ppl(conf)) {
65                 return ppl_write_stripe(conf, sh);
66         }
67
68         return -EAGAIN;
69 }
70
71 static inline void log_stripe_write_finished(struct stripe_head *sh)
72 {
73         struct r5conf *conf = sh->raid_conf;
74
75         if (conf->log)
76                 r5l_stripe_write_finished(sh);
77         else if (raid5_has_ppl(conf))
78                 ppl_stripe_write_finished(sh);
79 }
80
81 static inline void log_write_stripe_run(struct r5conf *conf)
82 {
83         if (conf->log)
84                 r5l_write_stripe_run(conf->log);
85         else if (raid5_has_ppl(conf))
86                 ppl_write_stripe_run(conf);
87 }
88
89 static inline void log_exit(struct r5conf *conf)
90 {
91         if (conf->log)
92                 r5l_exit_log(conf);
93         else if (raid5_has_ppl(conf))
94                 ppl_exit_log(conf);
95 }
96
97 static inline int log_init(struct r5conf *conf, struct md_rdev *journal_dev,
98                            bool ppl)
99 {
100         if (journal_dev)
101                 return r5l_init_log(conf, journal_dev);
102         else if (ppl)
103                 return ppl_init_log(conf);
104
105         return 0;
106 }
107
108 static inline int log_modify(struct r5conf *conf, struct md_rdev *rdev, bool add)
109 {
110         if (raid5_has_ppl(conf))
111                 return ppl_modify_log(conf, rdev, add);
112
113         return 0;
114 }
115
116 #endif