Prepare for threads. Convert rwlock to spin lock. This patch converts existing rwlocks only. In the next one lock is used where required.
https://virtuozzo.atlassian.net/browse/VSTOR-91821 Signed-off-by: Alexander Atanasov <alexander.atana...@virtuozzo.com> --- drivers/md/dm-ploop-cmd.c | 8 ++++---- drivers/md/dm-ploop-map.c | 22 ++++++++++++---------- drivers/md/dm-ploop-target.c | 2 +- drivers/md/dm-ploop.h | 2 +- 4 files changed, 18 insertions(+), 16 deletions(-) diff --git a/drivers/md/dm-ploop-cmd.c b/drivers/md/dm-ploop-cmd.c index fa9f8c9d8d40..dc0be65261f1 100644 --- a/drivers/md/dm-ploop-cmd.c +++ b/drivers/md/dm-ploop-cmd.c @@ -34,7 +34,7 @@ static void ploop_advance_holes_bitmap(struct ploop *ploop, return; cmd->resize.stage++; - write_lock_irqsave(&ploop->bat_rwlock, flags); + spin_lock_irqsave(&ploop->bat_lock, flags); /* Copy and swap holes_bitmap */ size = DIV_ROUND_UP(ploop->hb_nr, 8); memcpy(cmd->resize.holes_bitmap, ploop->holes_bitmap, size); @@ -59,7 +59,7 @@ static void ploop_advance_holes_bitmap(struct ploop *ploop, } spin_unlock(&md->md_lock); } - write_unlock_irqrestore(&ploop->bat_rwlock, flags); + spin_unlock_irqrestore(&ploop->bat_lock, flags); } static int ploop_wait_for_completion_maybe_killable(struct completion *comp, @@ -451,7 +451,7 @@ static int ploop_process_resize_cmd(struct ploop *ploop, struct ploop_cmd *cmd) /* Update header metadata */ ret = ploop_grow_update_header(ploop, cmd); out: - write_lock_irq(&ploop->bat_rwlock); + spin_lock_irq(&ploop->bat_lock); if (ret) { /* Cleanup: mark new BAT overages as free clusters */ dst_clu = cmd->resize.dst_clu - 1; @@ -465,7 +465,7 @@ static int ploop_process_resize_cmd(struct ploop *ploop, struct ploop_cmd *cmd) ploop_add_md_pages(ploop, &cmd->resize.md_pages_root); swap(ploop->nr_bat_entries, cmd->resize.nr_bat_entries); } - write_unlock_irq(&ploop->bat_rwlock); + spin_unlock_irq(&ploop->bat_lock); return ret; } diff --git a/drivers/md/dm-ploop-map.c b/drivers/md/dm-ploop-map.c index 052dae188264..8b32f559fdb9 100644 --- a/drivers/md/dm-ploop-map.c +++ b/drivers/md/dm-ploop-map.c @@ -557,13 +557,13 @@ static bool ploop_md_make_dirty(struct ploop *ploop, struct md_page *md) unsigned long flags; bool new = false; - write_lock_irqsave(&ploop->bat_rwlock, flags); + spin_lock_irqsave(&ploop->bat_lock, flags); WARN_ON_ONCE(test_bit(MD_WRITEBACK, &md->status)); if (!test_and_set_bit(MD_DIRTY, &md->status)) { llist_add((struct llist_node *)&md->wb_link, &ploop->wb_batch_llist); new = true; } - write_unlock_irqrestore(&ploop->bat_rwlock, flags); + spin_unlock_irqrestore(&ploop->bat_lock, flags); md->dirty_timeout = jiffies + ploop->md_submit_delay_ms*HZ/1000; return new; @@ -573,7 +573,7 @@ static void ploop_md_up_prio(struct ploop *ploop, struct md_page *md) { unsigned long flags; - write_lock_irqsave(&ploop->bat_rwlock, flags); + spin_lock_irqsave(&ploop->bat_lock, flags); if (test_bit(MD_WRITEBACK, &md->status)) goto out; if (test_and_set_bit(MD_HIGHPRIO, &md->status)) @@ -581,7 +581,7 @@ static void ploop_md_up_prio(struct ploop *ploop, struct md_page *md) WARN_ON_ONCE(!test_bit(MD_DIRTY, &md->status)); out: - write_unlock_irqrestore(&ploop->bat_rwlock, flags); + spin_unlock_irqrestore(&ploop->bat_lock, flags); } void ploop_disable_writeback_delay(struct ploop *ploop) @@ -732,9 +732,9 @@ static void ploop_complete_cow(struct ploop_cow *cow, blk_status_t bi_status) ploop_del_cluster_lk(ploop, cow_pio); if (dst_clu != BAT_ENTRY_NONE && bi_status != BLK_STS_OK) { - read_lock_irqsave(&ploop->bat_rwlock, flags); + spin_lock_irqsave(&ploop->bat_lock, flags); ploop_hole_set_bit(dst_clu, ploop); - read_unlock_irqrestore(&ploop->bat_rwlock, flags); + spin_unlock_irqrestore(&ploop->bat_lock, flags); } ploop_queue_or_fail(ploop, blk_status_to_errno(bi_status), cow_pio); @@ -1844,6 +1844,7 @@ static void ploop_process_resubmit_pios(struct ploop *ploop, static void ploop_submit_metadata_writeback(struct ploop *ploop) { + unsigned long flags; LIST_HEAD(ll_skipped); unsigned long timeout = jiffies; struct md_page *md; @@ -1851,9 +1852,9 @@ static void ploop_submit_metadata_writeback(struct ploop *ploop) struct llist_node *ll_wb_batch; /* Lock here to protect against md_inflight counting */ - write_lock_irq(&ploop->bat_rwlock); + spin_lock_irqsave(&ploop->bat_lock, flags); ll_wb_batch = llist_del_all(&ploop->wb_batch_llist); - write_unlock_irq(&ploop->bat_rwlock); + spin_unlock_irqrestore(&ploop->bat_lock, flags); /* * Pages are set dirty so no one must touch lists * if new md entries are dirtied they are added at the start of the list @@ -2007,6 +2008,7 @@ static int ploop_prepare_flush(struct ploop *ploop, struct pio *pio) struct md_page *md; int md_inflight = 0; struct llist_node *pos, *t; + unsigned long flags; if (pio->bi_op & REQ_PREFLUSH && (pio->bi_op & REQ_OP_MASK) != REQ_OP_FLUSH) { flush_pio = ploop_alloc_pio(ploop, GFP_NOIO); @@ -2023,7 +2025,7 @@ static int ploop_prepare_flush(struct ploop *ploop, struct pio *pio) flush_pio->free_on_endio = true; } - write_lock_irq(&ploop->bat_rwlock); + spin_lock_irqsave(&ploop->bat_lock, flags); llist_for_each_safe(pos, t, ploop->wb_batch_llist.first) { md = list_entry((struct list_head *)pos, typeof(*md), wb_link); md_inflight++; @@ -2032,7 +2034,7 @@ static int ploop_prepare_flush(struct ploop *ploop, struct pio *pio) } atomic_set(&flush_pio->md_inflight, md_inflight); - write_unlock_irq(&ploop->bat_rwlock); + spin_unlock_irqrestore(&ploop->bat_lock, flags); return md_inflight; } diff --git a/drivers/md/dm-ploop-target.c b/drivers/md/dm-ploop-target.c index 9a4a4dc57bb5..dc63c18cece8 100644 --- a/drivers/md/dm-ploop-target.c +++ b/drivers/md/dm-ploop-target.c @@ -405,7 +405,7 @@ static int ploop_ctr(struct dm_target *ti, unsigned int argc, char **argv) goto err; } - rwlock_init(&ploop->bat_rwlock); + spin_lock_init(&ploop->bat_lock); spin_lock_init(&ploop->err_status_lock); init_rwsem(&ploop->ctl_rwsem); init_waitqueue_head(&ploop->service_wq); diff --git a/drivers/md/dm-ploop.h b/drivers/md/dm-ploop.h index bf4b15ddd69a..6f1b1e284fc3 100644 --- a/drivers/md/dm-ploop.h +++ b/drivers/md/dm-ploop.h @@ -174,7 +174,7 @@ struct ploop { */ void *holes_bitmap; /* Clearing a bit occurs from kwork only */ u32 hb_nr; /* holes_bitmap size in bits */ - rwlock_t bat_rwlock; + spinlock_t bat_lock; struct llist_head wb_batch_llist; -- 2.43.0 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
