hugetlbfs: fix inaccurate comment in hugetlbfs_statfs()

In some cases, e.g.  when size option is not specified, f_blocks, f_bavail
and f_bfree will be set to -1 instead of 0.  Likewise, when nr_inodes
isn't specified, f_files and f_ffree will be set to -1 too.  Update the
comment to make this clear.

Link: https://lkml.kernel.org/r/20220726142918.51693-6-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 998672be99c5f2ea38f91faccaf322edae2b2ea0..be22cffbb5798e46d639d6321c94729aedd3aa0f 100644 (file)
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1090,7 +1090,7 @@ static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
        buf->f_bsize = huge_page_size(h);
        if (sbinfo) {
                spin_lock(&sbinfo->stat_lock);
-               /* If no limits set, just report 0 for max/free/used
+               /* If no limits set, just report 0 or -1 for max/free/used
                 * blocks, like simple_statfs() */
                if (sbinfo->spool) {
                        long free_pages;