f2fs: show the number of writeback pages in stat

This patch adds the # of writeback pages in stat info.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

2 files changed, 4 insertions, 3 deletions

diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
index 0f721f6a1147..ac2bd8e7eca9 100644
--- a/fs/f2fs/debug.c
+++ b/fs/f2fs/debug.c
@@ -40,6 +40,7 @@ static void update_general_status(struct f2fs_sb_info *sbi)
         si->ndirty_dirs = sbi->n_dirty_dirs;
         si->ndirty_meta = get_pages(sbi, F2FS_DIRTY_META);
         si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
+        si->wb_pages = get_pages(sbi, F2FS_WRITEBACK);
         si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
         si->rsvd_segs = reserved_segments(sbi);
         si->overp_segs = overprovision_segments(sbi);
@@ -266,8 +267,8 @@ static int stat_show(struct seq_file *s, void *v)
                 seq_printf(s, "\nExtent Hit Ratio: %d / %d\n",
                            si->hit_ext, si->total_ext);
                 seq_puts(s, "\nBalancing F2FS Async:\n");
-                seq_printf(s, "  - inmem: %4d\n",
-                           si->inmem_pages);
+                seq_printf(s, "  - inmem: %4d, wb: %4d\n",
+                           si->inmem_pages, si->wb_pages);
                 seq_printf(s, "  - nodes: %4d in %4d\n",
                            si->ndirty_node, si->node_pages);
                 seq_printf(s, "  - dents: %4d in dirs:%4d\n",
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 8231a599a305..964c240c287f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1549,7 +1549,7 @@ struct f2fs_stat_info {
         int ndirty_node, ndirty_dent, ndirty_dirs, ndirty_meta;
         int nats, dirty_nats, sits, dirty_sits, fnids;
         int total_count, utilization;
-        int bg_gc, inline_inode, inline_dir, inmem_pages;
+        int bg_gc, inline_inode, inline_dir, inmem_pages, wb_pages;
         unsigned int valid_count, valid_node_count, valid_inode_count;
         unsigned int bimodal, avg_vblocks;
         int util_free, util_valid, util_invalid;