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