diff options
Diffstat (limited to 'drivers/md/raid5-log.h')
| -rw-r--r-- | drivers/md/raid5-log.h | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/md/raid5-log.h b/drivers/md/raid5-log.h new file mode 100644 index 000000000000..27097101ccca --- /dev/null +++ b/drivers/md/raid5-log.h @@ -0,0 +1,115 @@ +#ifndef _RAID5_LOG_H +#define _RAID5_LOG_H + +extern int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev); +extern void r5l_exit_log(struct r5conf *conf); +extern int r5l_write_stripe(struct r5l_log *log, struct stripe_head *head_sh); +extern void r5l_write_stripe_run(struct r5l_log *log); +extern void r5l_flush_stripe_to_raid(struct r5l_log *log); +extern void r5l_stripe_write_finished(struct stripe_head *sh); +extern int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio); +extern void r5l_quiesce(struct r5l_log *log, int state); +extern bool r5l_log_disk_error(struct r5conf *conf); +extern bool r5c_is_writeback(struct r5l_log *log); +extern int +r5c_try_caching_write(struct r5conf *conf, struct stripe_head *sh, + struct stripe_head_state *s, int disks); +extern void +r5c_finish_stripe_write_out(struct r5conf *conf, struct stripe_head *sh, + struct stripe_head_state *s); +extern void r5c_release_extra_page(struct stripe_head *sh); +extern void r5c_use_extra_page(struct stripe_head *sh); +extern void r5l_wake_reclaim(struct r5l_log *log, sector_t space); +extern void r5c_handle_cached_data_endio(struct r5conf *conf, + struct stripe_head *sh, int disks); +extern int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh); +extern void r5c_make_stripe_write_out(struct stripe_head *sh); +extern void r5c_flush_cache(struct r5conf *conf, int num); +extern void r5c_check_stripe_cache_usage(struct r5conf *conf); +extern void r5c_check_cached_full_stripe(struct r5conf *conf); +extern struct md_sysfs_entry r5c_journal_mode; +extern void r5c_update_on_rdev_error(struct mddev *mddev); +extern bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect); + +extern struct dma_async_tx_descriptor * +ops_run_partial_parity(struct stripe_head *sh, struct raid5_percpu *percpu, + struct dma_async_tx_descriptor *tx); +extern int ppl_init_log(struct r5conf *conf); +extern void ppl_exit_log(struct r5conf *conf); +extern int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh); +extern void ppl_write_stripe_run(struct r5conf *conf); +extern void ppl_stripe_write_finished(struct stripe_head *sh); +extern int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add); + +static inline bool raid5_has_ppl(struct r5conf *conf) +{ + return test_bit(MD_HAS_PPL, &conf->mddev->flags); +} + +static inline int log_stripe(struct stripe_head *sh, struct stripe_head_state *s) +{ + struct r5conf *conf = sh->raid_conf; + + if (conf->log) { + if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) { + /* writing out phase */ + if (s->waiting_extra_page) + return 0; + return r5l_write_stripe(conf->log, sh); + } else if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) { + /* caching phase */ + return r5c_cache_data(conf->log, sh); + } + } else if (raid5_has_ppl(conf)) { + return ppl_write_stripe(conf, sh); + } + + return -EAGAIN; +} + +static inline void log_stripe_write_finished(struct stripe_head *sh) +{ + struct r5conf *conf = sh->raid_conf; + + if (conf->log) + r5l_stripe_write_finished(sh); + else if (raid5_has_ppl(conf)) + ppl_stripe_write_finished(sh); +} + +static inline void log_write_stripe_run(struct r5conf *conf) +{ + if (conf->log) + r5l_write_stripe_run(conf->log); + else if (raid5_has_ppl(conf)) + ppl_write_stripe_run(conf); +} + +static inline void log_exit(struct r5conf *conf) +{ + if (conf->log) + r5l_exit_log(conf); + else if (raid5_has_ppl(conf)) + ppl_exit_log(conf); +} + +static inline int log_init(struct r5conf *conf, struct md_rdev *journal_dev, + bool ppl) +{ + if (journal_dev) + return r5l_init_log(conf, journal_dev); + else if (ppl) + return ppl_init_log(conf); + + return 0; +} + +static inline int log_modify(struct r5conf *conf, struct md_rdev *rdev, bool add) +{ + if (raid5_has_ppl(conf)) + return ppl_modify_log(conf, rdev, add); + + return 0; +} + +#endif |