From a44f53faf4674d84cba79f7ee574584e18ab8744 Mon Sep 17 00:00:00 2001 From: Javier González Date: Sat, 22 Apr 2017 01:32:49 +0200 Subject: lightnvm: pblk: fix erase counters on error fail MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When block erases fail, these blocks are marked bad. The number of valid blocks in the line was not updated, which could cause an infinite loop on the erase path. Fix this atomic counter and, in order to avoid taking an irq lock on the interrupt context, make the erase counters atomic too. Also, in the case that a significant number of blocks become bad in a line, the result is the double shared metadata buffer (emeta) to stop the pipeline until all metadata is flushed to the media. Increase the number of metadata lines from 2 to 4 to avoid this case. Fixes: a4bd217b4326 "lightnvm: physical block device (pblk) target" Signed-off-by: Javier González Reviewed-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/pblk-write.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/lightnvm/pblk-write.c') diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c index a896190c82f0..aef6fd7c4a0c 100644 --- a/drivers/lightnvm/pblk-write.c +++ b/drivers/lightnvm/pblk-write.c @@ -244,7 +244,7 @@ static int pblk_setup_w_rq(struct pblk *pblk, struct nvm_rq *rqd, } ppa_set_empty(&erase_ppa); - if (likely(!e_line || !e_line->left_eblks)) + if (likely(!e_line || !atomic_read(&e_line->left_eblks))) pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, valid, 0); else pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, @@ -257,7 +257,7 @@ out: struct nvm_geo *geo = &dev->geo; int bit; - e_line->left_eblks++; + atomic_inc(&e_line->left_eblks); bit = erase_ppa.g.lun * geo->nr_chnls + erase_ppa.g.ch; WARN_ON(!test_and_clear_bit(bit, e_line->erase_bitmap)); up(&pblk->erase_sem); -- cgit v1.2.3