f2fs: Fix the accounting of dcc->undiscard_blks

When a discard_cmd needs to be split due to dpolicy->max_requests, then
for the remaining length it will be either merged into another cmd or a
new discard_cmd will be created. In this case, there is double
accounting of dcc->undiscard_blks for the remaining len, due to which
it shows incorrect value in stats.

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 728ff6e..1c48ec8 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1214,8 +1214,10 @@ submit:
                len = total_len;
        }
 
-       if (!err && len)
+       if (!err && len) {
+               dcc->undiscard_blks -= len;
                __update_discard_tree_range(sbi, bdev, lstart, start, len);
+       }
        return err;
 }