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
  36 extern struct dma_async_tx_descriptor *
  37 ops_run_partial_parity(struct stripe_head *sh, struct raid5_percpu *percpu,
  38                        struct dma_async_tx_descriptor *tx);
  39 extern int ppl_init_log(struct r5conf *conf);
  40 extern void ppl_exit_log(struct r5conf *conf);
  41 extern int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh);
  42 extern void ppl_write_stripe_run(struct r5conf *conf);
  43 extern void ppl_stripe_write_finished(struct stripe_head *sh);
  44 extern int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add);
  45
  46 static inline bool raid5_has_log(struct r5conf *conf)
  47 {
  48         return test_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
  49 }
  50
  51 static inline bool raid5_has_ppl(struct r5conf *conf)
  52 {
  53         return test_bit(MD_HAS_PPL, &conf->mddev->flags);
  54 }
  55
  56 static inline int log_stripe(struct stripe_head *sh, struct stripe_head_state *s)
  57 {
  58         struct r5conf *conf = sh->raid_conf;
  59
  60         if (conf->log) {
  61                 if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) {
  62                         /* writing out phase */
  63                         if (s->waiting_extra_page)
  64                                 return 0;
  65                         return r5l_write_stripe(conf->log, sh);
  66                 } else if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) {
  67                         /* caching phase */
  68                         return r5c_cache_data(conf->log, sh);
  69                 }
  70         } else if (raid5_has_ppl(conf)) {
  71                 return ppl_write_stripe(conf, sh);
  72         }
  73
  74         return -EAGAIN;
  75 }
  76
  77 static inline void log_stripe_write_finished(struct stripe_head *sh)
  78 {
  79         struct r5conf *conf = sh->raid_conf;
  80
  81         if (conf->log)
  82                 r5l_stripe_write_finished(sh);
  83         else if (raid5_has_ppl(conf))
  84                 ppl_stripe_write_finished(sh);
  85 }
  86
  87 static inline void log_write_stripe_run(struct r5conf *conf)
  88 {
  89         if (conf->log)
  90                 r5l_write_stripe_run(conf->log);
  91         else if (raid5_has_ppl(conf))
  92                 ppl_write_stripe_run(conf);
  93 }
  94
  95 static inline void log_exit(struct r5conf *conf)
  96 {
  97         if (conf->log)
  98                 r5l_exit_log(conf);
  99         else if (raid5_has_ppl(conf))
 100                 ppl_exit_log(conf);
 101 }
 102
 103 static inline int log_init(struct r5conf *conf, struct md_rdev *journal_dev,
 104                            bool ppl)
 105 {
 106         if (journal_dev)
 107                 return r5l_init_log(conf, journal_dev);
 108         else if (ppl)
 109                 return ppl_init_log(conf);
 110
 111         return 0;
 112 }
 113
 114 static inline int log_modify(struct r5conf *conf, struct md_rdev *rdev, bool add)
 115 {
 116         if (raid5_has_ppl(conf))
 117                 return ppl_modify_log(conf, rdev, add);
 118
 119         return 0;
 120 }
 121
 122 #endif