f2fs: add to account direct IO

This patch adds f2fs_dio_submit_bio() to hook submit_io/end_io functions
in direct IO path, in order to account DIO.

Later, we will add this count into is_idle() to let background GC/Discard
thread be aware of DIO.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index 0ba662315d93..1f1230f690ec 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -53,6 +53,8 @@ static void update_general_status(struct f2fs_sb_info *sbi)
         si->vw_cnt = atomic_read(&sbi->vw_cnt);
         si->max_aw_cnt = atomic_read(&sbi->max_aw_cnt);
         si->max_vw_cnt = atomic_read(&sbi->max_vw_cnt);
+        si->nr_dio_read = get_pages(sbi, F2FS_DIO_READ);
+        si->nr_dio_write = get_pages(sbi, F2FS_DIO_WRITE);
         si->nr_wb_cp_data = get_pages(sbi, F2FS_WB_CP_DATA);
         si->nr_wb_data = get_pages(sbi, F2FS_WB_DATA);
         si->nr_rd_data = get_pages(sbi, F2FS_RD_DATA);
@@ -374,6 +376,8 @@ 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, "  - DIO (R: %4d, W: %4d)\n",
+                           si->nr_dio_read, si->nr_dio_write);
                 seq_printf(s, "  - IO_R (Data: %4d, Node: %4d, Meta: %4d\n",
                            si->nr_rd_data, si->nr_rd_node, si->nr_rd_meta);
                 seq_printf(s, "  - IO_W (CP: %4d, Data: %4d, Flush: (%4d %4d %4d), "