[PATCH 5.18 626/879] hugetlbfs: fix hugetlbfs_statfs() locking

Greg Kroah-Hartman
2022-06-08T00:58:15Z

From: Mina Almasry <almasrymina@google.com>

[ Upstream commit 4b25f030ae69ba710eff587cabb4c57cb7e7a8a1 ]

After commit db71ef79b59b ("hugetlb: make free_huge_page irq safe"), the
subpool lock should be locked with spin_lock_irq() and all call sites was
modified as such, except for the ones in hugetlbfs_statfs().

Link: https://lkml.kernel.org/r/20220429202207.3045-1-almasrymina@google.com
Fixes: db71ef79b59b ("hugetlb: make free_huge_page irq safe")
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/hugetlbfs/inode.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index dd3a088db11d..591599829e2a 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1048,12 +1048,12 @@ static int hugetlbfs_statfs(struct dentry *dentry, struct kstatfs *buf)
if (sbinfo->spool) {
long free_pages;

- spin_lock(&sbinfo->spool->lock);
+ spin_lock_irq(&sbinfo->spool->lock);
buf->f_blocks = sbinfo->spool->max_hpages;
free_pages = sbinfo->spool->max_hpages
- sbinfo->spool->used_hpages;
buf->f_bavail = buf->f_bfree = free_pages;
- spin_unlock(&sbinfo->spool->lock);
+ spin_unlock_irq(&sbinfo->spool->lock);
buf->f_files = sbinfo->max_inodes;
buf->f_ffree = sbinfo->free_inodes;
}
--
2.35.1