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>

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 8e39b850bfc0901bd672f3c4bedc7495d44276c1..3da6fb276f8b6cd5dc564d87b01852a1a228419b 100644 (file)
--- 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;