f2fs: fix incorrect free inode count in ->statfs

While calculating inode count that we can create at most in the left space,
we should consider space which data/node blocks occupied, since we create
data/node mixly in main area. So fix the wrong calculation in ->statfs.

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

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 4ccbb860ad062b91aa04ad48a353d5bf73b33b4e..2852a0b34d64200ae5f11c4cc5ce25260908a55c 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -852,7 +852,8 @@ static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
        buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 
        buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
-       buf->f_ffree = buf->f_files - valid_inode_count(sbi);
+       buf->f_ffree = min(buf->f_files - valid_node_count(sbi),
+                                                       buf->f_bavail);
 
        buf->f_namelen = F2FS_NAME_LEN;
        buf->f_fsid.val[0] = (u32)id;