[PATCH 6/6] f2fs: show # of on-going flush and discard bios

[Jaegeuk Kim <jaegeuk@xxxxxxxxxx>]

This patch adds stat information for flush and discard commands.

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 fs/f2fs/debug.c   | 7 +++++--
 fs/f2fs/f2fs.h    | 3 ++-
 fs/f2fs/segment.c | 4 ++++
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index f9f6b0aeba02..e67cab2fafac 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -54,6 +54,8 @@ static void update_general_status(struct f2fs_sb_info *sbi)
 	si->max_aw_cnt = atomic_read(&sbi->max_aw_cnt);
 	si->nr_wb_cp_data = get_pages(sbi, F2FS_WB_CP_DATA);
 	si->nr_wb_data = get_pages(sbi, F2FS_WB_DATA);
+	si->nr_flush = atomic_read(&SM_I(sbi)->fcc_info->submit_flush);
+	si->nr_discard = atomic_read(&SM_I(sbi)->dcc_info->submit_discard);
 	si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
 	si->rsvd_segs = reserved_segments(sbi);
 	si->overp_segs = overprovision_segments(sbi);
@@ -318,8 +320,9 @@ static int stat_show(struct seq_file *s, void *v)
 		seq_printf(s, "  - Inner Struct Count: tree: %d(%d), node: %d\n",
 				si->ext_tree, si->zombie_tree, si->ext_node);
 		seq_puts(s, "\nBalancing F2FS Async:\n");
-		seq_printf(s, "  - IO (CP: %4d, Data: %4d)\n",
-			   si->nr_wb_cp_data, si->nr_wb_data);
+		seq_printf(s, "  - IO (CP: %4d, Data: %4d, Flush: %4d, Discard: %4d)\n",
+			   si->nr_wb_cp_data, si->nr_wb_data,
+			   si->nr_flush, si->nr_discard);
 		seq_printf(s, "  - inmem: %4d, atomic IO: %4d (Max. %4d)\n",
 			   si->inmem_pages, si->aw_cnt, si->max_aw_cnt);
 		seq_printf(s, "  - nodes: %4d in %4d\n",
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ef5e3709c161..d51bc18e7292 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -201,6 +201,7 @@ struct discard_cmd_control {
 	wait_queue_head_t discard_wait_queue;	/* waiting queue for wake-up */
 	struct mutex cmd_lock;
 	int max_discards;			/* max. discards to be issued */
+	atomic_t submit_discard;		/* # of issued discard */
 };
 
 /* for the list of fsync inodes, used only during recovery */
@@ -2254,7 +2255,7 @@ struct f2fs_stat_info {
 	unsigned int ndirty_dirs, ndirty_files, ndirty_all;
 	int nats, dirty_nats, sits, dirty_sits, free_nids, alloc_nids;
 	int total_count, utilization;
-	int bg_gc, nr_wb_cp_data, nr_wb_data;
+	int bg_gc, nr_wb_cp_data, nr_wb_data, nr_flush, nr_discard;
 	int inline_xattr, inline_inode, inline_dir, orphans;
 	int aw_cnt, max_aw_cnt;
 	unsigned int valid_count, valid_node_count, valid_inode_count, discard_blks;
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 74364006bfa6..5a2d380182d9 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -653,6 +653,8 @@ static void __remove_discard_cmd(struct f2fs_sb_info *sbi, struct discard_cmd *d
 {
 	int err = dc->bio->bi_error;
 
+	atomic_dec(&(SM_I(sbi)->dcc_info->submit_discard));
+
 	if (err == -EOPNOTSUPP)
 		err = 0;
 
@@ -678,6 +680,7 @@ void f2fs_wait_discard_bio(struct f2fs_sb_info *sbi, block_t blkaddr)
 			if (dc->state == D_PREP) {
 				dc->state = D_SUBMIT;
 				submit_bio(dc->bio);
+				atomic_inc(&dcc->submit_discard);
 			}
 			wait_for_completion_io(&dc->wait);
 
@@ -723,6 +726,7 @@ static int issue_discard_thread(void *data)
 		if (dc->state == D_PREP) {
 			dc->state = D_SUBMIT;
 			submit_bio(dc->bio);
+			atomic_inc(&dcc->submit_discard);
 			if (iter++ > DISCARD_ISSUE_RATE)
 				break;
 		} else if (dc->state == D_DONE) {
-- 
2.11.0

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