[PATCH 10/20] lightnvm: pblk: delete redundant buffer pointer

[Javier GonzÃlez]

After refactoring the metadata path, the backpointer controlling
synced I/Os in a line becomes unnecessary; metadata is scheduled
on the write thread, thus we know when the end of the line is reached
and act on it directly.

Signed-off-by: Javier GonzÃlez <javier@xxxxxxxxxxxx>
Signed-off-by: Matias BjÃrling <matias@xxxxxxxxxxxx>
---
 drivers/lightnvm/pblk-core.c     | 18 +++---------------
 drivers/lightnvm/pblk-init.c     |  1 -
 drivers/lightnvm/pblk-map.c      |  2 +-
 drivers/lightnvm/pblk-recovery.c |  2 --
 drivers/lightnvm/pblk-sysfs.c    | 10 ++++------
 drivers/lightnvm/pblk-write.c    | 13 +------------
 drivers/lightnvm/pblk.h          |  6 ++----
 7 files changed, 11 insertions(+), 41 deletions(-)

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
index 6e4b06f841e7..beae1618483f 100644
--- a/drivers/lightnvm/pblk-core.c
+++ b/drivers/lightnvm/pblk-core.c
@@ -65,8 +65,8 @@ static void pblk_end_io_erase(struct nvm_rq *rqd)
 	mempool_free(rqd, pblk->g_rq_pool);
 }
 
-static void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
-				  u64 paddr)
+void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
+			   u64 paddr)
 {
 	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 	struct list_head *move_list = NULL;
@@ -129,18 +129,6 @@ void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa)
 	__pblk_map_invalidate(pblk, line, paddr);
 }
 
-void pblk_map_pad_invalidate(struct pblk *pblk, struct pblk_line *line,
-			     u64 paddr)
-{
-	__pblk_map_invalidate(pblk, line, paddr);
-
-	pblk_rb_sync_init(&pblk->rwb, NULL);
-	line->left_ssecs--;
-	if (!line->left_ssecs)
-		pblk_line_run_ws(pblk, line, NULL, pblk_line_close_ws);
-	pblk_rb_sync_end(&pblk->rwb, NULL);
-}
-
 static void pblk_invalidate_range(struct pblk *pblk, sector_t slba,
 				  unsigned int nr_secs)
 {
@@ -1057,7 +1045,7 @@ static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line,
 	line->sec_in_line -= lm->emeta_sec[0];
 	line->emeta_ssec = off;
 	line->nr_valid_lbas = 0;
-	line->left_ssecs = line->left_msecs = line->sec_in_line;
+	line->left_msecs = line->sec_in_line;
 	*line->vsc = cpu_to_le32(line->sec_in_line);
 
 	if (lm->sec_per_line - line->sec_in_line !=
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index e51b965ae6a9..968c2e390cef 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -889,7 +889,6 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
 	atomic_long_set(&pblk->req_writes, 0);
 	atomic_long_set(&pblk->sub_writes, 0);
 	atomic_long_set(&pblk->sync_writes, 0);
-	atomic_long_set(&pblk->compl_writes, 0);
 	atomic_long_set(&pblk->inflight_reads, 0);
 	atomic_long_set(&pblk->cache_reads, 0);
 	atomic_long_set(&pblk->sync_reads, 0);
diff --git a/drivers/lightnvm/pblk-map.c b/drivers/lightnvm/pblk-map.c
index 08580a649499..9942d9bc7b3a 100644
--- a/drivers/lightnvm/pblk-map.c
+++ b/drivers/lightnvm/pblk-map.c
@@ -56,7 +56,7 @@ static void pblk_map_page_data(struct pblk *pblk, unsigned int sentry,
 			u64 addr_empty = cpu_to_le64(ADDR_EMPTY);
 
 			lba_list[paddr] = meta_list[i].lba = addr_empty;
-			pblk_map_pad_invalidate(pblk, line, paddr);
+			__pblk_map_invalidate(pblk, line, paddr);
 		}
 	}
 
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
index ba02d0bc3e45..7b0ace2f4957 100644
--- a/drivers/lightnvm/pblk-recovery.c
+++ b/drivers/lightnvm/pblk-recovery.c
@@ -553,7 +553,6 @@ static int pblk_recov_scan_all_oob(struct pblk *pblk, struct pblk_line *line,
 		if (ret)
 			pr_err("pblk: OOB read failed (err:%d)\n", ret);
 
-		line->left_ssecs = line->left_msecs;
 		left_ppas = 0;
 	}
 
@@ -659,7 +658,6 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
 		/* Roll back failed sectors */
 		line->cur_sec -= nr_error_bits;
 		line->left_msecs += nr_error_bits;
-		line->left_ssecs = line->left_msecs;
 		bitmap_clear(line->map_bitmap, line->cur_sec, nr_error_bits);
 
 		left_ppas = 0;
diff --git a/drivers/lightnvm/pblk-sysfs.c b/drivers/lightnvm/pblk-sysfs.c
index 3d9a77646a3d..e1e92c9498a9 100644
--- a/drivers/lightnvm/pblk-sysfs.c
+++ b/drivers/lightnvm/pblk-sysfs.c
@@ -154,7 +154,7 @@ static ssize_t pblk_sysfs_lines(struct pblk *pblk, char *page)
 	int d_line_cnt = 0, l_line_cnt = 0;
 	int gc_full = 0, gc_high = 0, gc_mid = 0, gc_low = 0, gc_empty = 0;
 	int bad = 0, cor = 0;
-	int msecs = 0, ssecs = 0, cur_sec = 0, vsc = 0, sec_in_line = 0;
+	int msecs = 0, cur_sec = 0, vsc = 0, sec_in_line = 0;
 	int map_weight = 0, meta_weight = 0;
 
 	spin_lock(&l_mg->free_lock);
@@ -227,7 +227,6 @@ static ssize_t pblk_sysfs_lines(struct pblk *pblk, char *page)
 	if (l_mg->data_line) {
 		cur_sec = l_mg->data_line->cur_sec;
 		msecs = l_mg->data_line->left_msecs;
-		ssecs = l_mg->data_line->left_ssecs;
 		vsc = le32_to_cpu(*l_mg->data_line->vsc);
 		sec_in_line = l_mg->data_line->sec_in_line;
 		meta_weight = bitmap_weight(&l_mg->meta_bitmap,
@@ -259,8 +258,8 @@ static ssize_t pblk_sysfs_lines(struct pblk *pblk, char *page)
 			atomic_read(&pblk->gc.inflight_gc));
 
 	sz += snprintf(page + sz, PAGE_SIZE - sz,
-		"data (%d) cur:%d, left:%d/%d, vsc:%d, s:%d, map:%d/%d (%d)\n",
-			cur_data, cur_sec, msecs, ssecs, vsc, sec_in_line,
+		"data (%d) cur:%d, left:%d, vsc:%d, s:%d, map:%d/%d (%d)\n",
+			cur_data, cur_sec, msecs, vsc, sec_in_line,
 			map_weight, lm->sec_per_line, meta_weight);
 
 	return sz;
@@ -303,7 +302,7 @@ static ssize_t pblk_sysfs_get_sec_per_write(struct pblk *pblk, char *page)
 static ssize_t pblk_sysfs_stats_debug(struct pblk *pblk, char *page)
 {
 	return snprintf(page, PAGE_SIZE,
-		"%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\n",
+		"%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\n",
 			atomic_long_read(&pblk->inflight_writes),
 			atomic_long_read(&pblk->inflight_reads),
 			atomic_long_read(&pblk->req_writes),
@@ -312,7 +311,6 @@ static ssize_t pblk_sysfs_stats_debug(struct pblk *pblk, char *page)
 			atomic_long_read(&pblk->padded_wb),
 			atomic_long_read(&pblk->sub_writes),
 			atomic_long_read(&pblk->sync_writes),
-			atomic_long_read(&pblk->compl_writes),
 			atomic_long_read(&pblk->recov_writes),
 			atomic_long_read(&pblk->recov_gc_writes),
 			atomic_long_read(&pblk->recov_gc_reads),
diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
index 1739c970692e..a29a34786ac5 100644
--- a/drivers/lightnvm/pblk-write.c
+++ b/drivers/lightnvm/pblk-write.c
@@ -17,16 +17,6 @@
 
 #include "pblk.h"
 
-static void pblk_sync_line(struct pblk *pblk, struct pblk_line *line)
-{
-#ifdef CONFIG_NVM_DEBUG
-	atomic_long_inc(&pblk->sync_writes);
-#endif
-
-	/* Counter protected by rb sync lock */
-	line->left_ssecs--;
-}
-
 static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,
 				    struct pblk_c_ctx *c_ctx)
 {
@@ -44,14 +34,13 @@ static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,
 
 		p = rqd->ppa_list[i];
 		line = &pblk->lines[pblk_dev_ppa_to_line(p)];
-		pblk_sync_line(pblk, line);
 
 		while ((original_bio = bio_list_pop(&w_ctx->bios)))
 			bio_endio(original_bio);
 	}
 
 #ifdef CONFIG_NVM_DEBUG
-	atomic_long_add(c_ctx->nr_valid, &pblk->compl_writes);
+	atomic_long_add(c_ctx->nr_valid, &pblk->sync_writes);
 #endif
 
 	ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid);
diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
index 954a0733510b..407d15c69fb4 100644
--- a/drivers/lightnvm/pblk.h
+++ b/drivers/lightnvm/pblk.h
@@ -395,7 +395,6 @@ struct pblk_line {
 	atomic_t left_seblks;		/* Blocks left for sync erasing */
 
 	int left_msecs;			/* Sectors left for mapping */
-	int left_ssecs;			/* Sectors left to sync */
 	unsigned int cur_sec;		/* Sector map pointer */
 	unsigned int nr_valid_lbas;	/* Number of valid lbas in line */
 
@@ -555,7 +554,6 @@ struct pblk {
 	atomic_long_t req_writes;	/* Sectors stored on write buffer */
 	atomic_long_t sub_writes;	/* Sectors submitted from buffer */
 	atomic_long_t sync_writes;	/* Sectors synced to media */
-	atomic_long_t compl_writes;	/* Sectors completed in write bio */
 	atomic_long_t inflight_reads;	/* Inflight sector read requests */
 	atomic_long_t cache_reads;	/* Read requests that hit the cache */
 	atomic_long_t sync_reads;	/* Completed sector read requests */
@@ -706,11 +704,11 @@ void pblk_end_bio_sync(struct bio *bio);
 void pblk_end_io_sync(struct nvm_rq *rqd);
 int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
 		       int nr_pages);
-void pblk_map_pad_invalidate(struct pblk *pblk, struct pblk_line *line,
-			     u64 paddr);
 void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
 			 int nr_pages);
 void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa);
+void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
+			   u64 paddr);
 void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa);
 void pblk_update_map_cache(struct pblk *pblk, sector_t lba,
 			   struct ppa_addr ppa);
-- 
2.7.4