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845b9e229f
Use resize_stripes() instead of raid5_reset_stripe_cache() to allocate or free sh->ppl_page at runtime for all stripes in the stripe cache. raid5_reset_stripe_cache() required suspending the mddev and could deadlock because of GFP_KERNEL allocations. Move the 'newsize' check to check_reshape() to allow reallocating the stripes with the same number of disks. Allocate sh->ppl_page in alloc_stripe() instead of grow_buffers(). Pass 'struct r5conf *conf' as a parameter to alloc_stripe() because it is needed to check whether to allocate ppl_page. Add free_stripe() and use it to free stripes rather than directly call kmem_cache_free(). Also free sh->ppl_page in free_stripe(). Set MD_HAS_PPL at the end of ppl_init_log() instead of explicitly setting it in advance and add another parameter to log_init() to allow calling ppl_init_log() without the bit set. Don't try to calculate partial parity or add a stripe to log if it does not have ppl_page set. Enabling ppl can now be performed without suspending the mddev, because the log won't be used until new stripes are allocated with ppl_page. Calling mddev_suspend/resume is still necessary when disabling ppl, because we want all stripes to finish before stopping the log, but resize_stripes() can be called after mddev_resume() when ppl is no longer active. Suggested-by: NeilBrown <neilb@suse.com> Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com> Signed-off-by: Shaohua Li <shli@fb.com>
116 lines
3.7 KiB
C
116 lines
3.7 KiB
C
#ifndef _RAID5_LOG_H
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#define _RAID5_LOG_H
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extern int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev);
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extern void r5l_exit_log(struct r5conf *conf);
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extern int r5l_write_stripe(struct r5l_log *log, struct stripe_head *head_sh);
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extern void r5l_write_stripe_run(struct r5l_log *log);
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extern void r5l_flush_stripe_to_raid(struct r5l_log *log);
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extern void r5l_stripe_write_finished(struct stripe_head *sh);
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extern int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio);
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extern void r5l_quiesce(struct r5l_log *log, int state);
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extern bool r5l_log_disk_error(struct r5conf *conf);
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extern bool r5c_is_writeback(struct r5l_log *log);
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extern int
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r5c_try_caching_write(struct r5conf *conf, struct stripe_head *sh,
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struct stripe_head_state *s, int disks);
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extern void
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r5c_finish_stripe_write_out(struct r5conf *conf, struct stripe_head *sh,
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struct stripe_head_state *s);
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extern void r5c_release_extra_page(struct stripe_head *sh);
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extern void r5c_use_extra_page(struct stripe_head *sh);
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extern void r5l_wake_reclaim(struct r5l_log *log, sector_t space);
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extern void r5c_handle_cached_data_endio(struct r5conf *conf,
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struct stripe_head *sh, int disks);
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extern int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh);
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extern void r5c_make_stripe_write_out(struct stripe_head *sh);
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extern void r5c_flush_cache(struct r5conf *conf, int num);
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extern void r5c_check_stripe_cache_usage(struct r5conf *conf);
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extern void r5c_check_cached_full_stripe(struct r5conf *conf);
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extern struct md_sysfs_entry r5c_journal_mode;
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extern void r5c_update_on_rdev_error(struct mddev *mddev);
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extern bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect);
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extern struct dma_async_tx_descriptor *
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ops_run_partial_parity(struct stripe_head *sh, struct raid5_percpu *percpu,
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struct dma_async_tx_descriptor *tx);
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extern int ppl_init_log(struct r5conf *conf);
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extern void ppl_exit_log(struct r5conf *conf);
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extern int ppl_write_stripe(struct r5conf *conf, struct stripe_head *sh);
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extern void ppl_write_stripe_run(struct r5conf *conf);
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extern void ppl_stripe_write_finished(struct stripe_head *sh);
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extern int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add);
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static inline bool raid5_has_ppl(struct r5conf *conf)
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{
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return test_bit(MD_HAS_PPL, &conf->mddev->flags);
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}
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static inline int log_stripe(struct stripe_head *sh, struct stripe_head_state *s)
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{
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struct r5conf *conf = sh->raid_conf;
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if (conf->log) {
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if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) {
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/* writing out phase */
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if (s->waiting_extra_page)
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return 0;
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return r5l_write_stripe(conf->log, sh);
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} else if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) {
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/* caching phase */
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return r5c_cache_data(conf->log, sh);
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}
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} else if (raid5_has_ppl(conf)) {
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return ppl_write_stripe(conf, sh);
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}
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return -EAGAIN;
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}
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static inline void log_stripe_write_finished(struct stripe_head *sh)
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{
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struct r5conf *conf = sh->raid_conf;
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if (conf->log)
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r5l_stripe_write_finished(sh);
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else if (raid5_has_ppl(conf))
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ppl_stripe_write_finished(sh);
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}
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static inline void log_write_stripe_run(struct r5conf *conf)
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{
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if (conf->log)
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r5l_write_stripe_run(conf->log);
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else if (raid5_has_ppl(conf))
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ppl_write_stripe_run(conf);
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}
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static inline void log_exit(struct r5conf *conf)
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{
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if (conf->log)
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r5l_exit_log(conf);
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else if (raid5_has_ppl(conf))
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ppl_exit_log(conf);
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}
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static inline int log_init(struct r5conf *conf, struct md_rdev *journal_dev,
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bool ppl)
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{
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if (journal_dev)
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return r5l_init_log(conf, journal_dev);
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else if (ppl)
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return ppl_init_log(conf);
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return 0;
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}
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static inline int log_modify(struct r5conf *conf, struct md_rdev *rdev, bool add)
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{
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if (raid5_has_ppl(conf))
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return ppl_modify_log(conf, rdev, add);
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return 0;
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}
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#endif
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