[PATCH] hugetlbfs: report inode limits without a memory subpool

[PATCH] hugetlbfs: report inode limits without a memory subpool

[Hungyu Lin]

A hugetlbfs mount can limit inodes with nr_inodes independently of size
or min_size. hugetlbfs_statfs() only fills f_files and f_ffree when a
memory subpool exists, so an inode-only limit is enforced but its inode
counts are reported as zero.

For example, a fresh mount with nr_inodes=4 reports zero total and free
inodes instead of 4 and 3. This hides the inode limit from tools such
as df -i, even when creating another file fails with ENOSPC.

Report the inode counters when an inode limit is configured,
independently of the memory subpool. Preserve the existing zero and -1
results for unlimited inode counts.

Fixes: 74a8a65c5261 ("[PATCH] Fix hugetlbfs_statfs() reporting of block limits")
Signed-off-by: Hungyu Lin <dennylin0707@gmail.com>
---
 fs/hugetlbfs/inode.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 01c4d6f44ebe..e94ee8e17004 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1113,6 +1113,8 @@ static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 				- sbinfo->spool->used_hpages;
 			buf->f_bavail = buf->f_bfree = free_pages;
 			spin_unlock_irq(&sbinfo->spool->lock);
+		}
+		if (sbinfo->spool || sbinfo->max_inodes >= 0) {
 			buf->f_files = sbinfo->max_inodes;
 			buf->f_ffree = sbinfo->free_inodes;
 		}
-- 
2.43.0

Re: [PATCH] hugetlbfs: report inode limits without a memory subpool

[Aveline Noir]

Hi Hungyu,

On Sun, 01 Nov 2026 12:26:53 +0000 Hungyu Lin wrote:

> Report the inode counters when an inode limit is configured,
> independently of the memory subpool. Preserve the existing zero and -1
> results for unlimited inode counts.

Tested in an x86-64 QEMU/KVM guest and all checks passed.
Inode-only counts are fixed, and unlimited counts are unchanged.
Makes sense to me.

Reviewed-by: Aveline Noir <jm5905938@gmail.com>
Tested-by: Aveline Noir <jm5905938@gmail.com>

Thanks,
Aveline Noir