[PATCH] fs/ceph/quota: ignore quota with CAP_SYS_RESOURCE

From: Max Kellermann
Date: Thu Aug 29 2024 - 06:57:58 EST


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@xxxxxxxxx>
---
fs/ceph/quota.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c
index 06ee397e0c3a..666315ec74d3 100644
--- a/fs/ceph/quota.c
+++ b/fs/ceph/quota.c
@@ -429,6 +429,9 @@ bool ceph_quota_is_max_files_exceeded(struct inode *inode)

WARN_ON(!S_ISDIR(inode->i_mode));

+ if (capable(CAP_SYS_RESOURCE))
+ return false;
+
return check_quota_exceeded(inode, QUOTA_CHECK_MAX_FILES_OP, 1);
}

@@ -451,6 +454,9 @@ bool ceph_quota_is_max_bytes_exceeded(struct inode *inode, loff_t newsize)
if (newsize <= size)
return false;

+ if (capable(CAP_SYS_RESOURCE))
+ return false;
+
return check_quota_exceeded(inode, QUOTA_CHECK_MAX_BYTES_OP, (newsize - size));
}

@@ -473,6 +479,9 @@ bool ceph_quota_is_max_bytes_approaching(struct inode *inode, loff_t newsize)
if (newsize <= size)
return false;

+ if (capable(CAP_SYS_RESOURCE))
+ return false;
+
return check_quota_exceeded(inode, QUOTA_CHECK_MAX_BYTES_APPROACHING_OP,
(newsize - size));
}
--
2.45.2