linux-kernel - [PATCH v2] fs/ceph/quota: ignore quota with CAP_SYS

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Message-ID: <20240911142452.4110190-1-max.kellermann@ionos.com>
Date: Wed, 11 Sep 2024 16:24:51 +0200
From: Max Kellermann <max.kellermann@...os.com>
To: xiubli@...hat.com,
	idryomov@...il.com,
	ceph-devel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Max Kellermann <max.kellermann@...os.com>
Subject: [PATCH v2] fs/ceph/quota: ignore quota with CAP_SYS_RESOURCE

CAP_SYS_RESOURCE allows users to "override disk quota limits".  Most
filesystems have a CAP_SYS_RESOURCE check in all quota check code
paths, but Ceph currently does not.  This patch implements the
feature.

Signed-off-by: Max Kellermann <max.kellermann@...os.com>
---
v1 -> v2: moved capable check to check_quota_exceeded()
---
 fs/ceph/quota.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c
index 06ee397e0c3a..c428dc8e8f23 100644
--- a/fs/ceph/quota.c
+++ b/fs/ceph/quota.c
@@ -334,6 +334,9 @@ static bool check_quota_exceeded(struct inode *inode, enum quota_check_op op,
 	u64 max, rvalue;
 	bool exceeded = false;
 
+	if (capable(CAP_SYS_RESOURCE))
+		return false;
+
 	if (ceph_snap(inode) != CEPH_NOSNAP)
 		return false;
 
-- 
2.45.2