f2fs: report # of free inodes more precisely

If the partition is small, we don't need to report total # of inodes including
hidden free nodes.

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

1 files changed, 11 insertions, 3 deletions

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 8e39b850bfc0..3da6fb276f8b 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -680,6 +680,7 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
         struct f2fs_sb_info *sbi = F2FS_SB(sb);
         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
         block_t total_count, user_block_count, start_count, ovp_count;
+        u64 avail_node_count;
 
         total_count = le64_to_cpu(sbi->raw_super->block_count);
         user_block_count = sbi->user_block_count;
@@ -692,9 +693,16 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
         buf->f_bfree = user_block_count - valid_user_blocks(sbi) + ovp_count;
         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 
-        buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
-        buf->f_ffree = min(buf->f_files - valid_node_count(sbi),
-                                                        buf->f_bavail);
+        avail_node_count = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
+
+        if (avail_node_count > user_block_count) {
+                buf->f_files = user_block_count;
+                buf->f_ffree = buf->f_bavail;
+        } else {
+                buf->f_files = avail_node_count;
+                buf->f_ffree = min(avail_node_count - valid_node_count(sbi),
+                                        buf->f_bavail);
+        }
 
         buf->f_namelen = F2FS_NAME_LEN;
         buf->f_fsid.val[0] = (u32)id;