src/basic/quota-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <inttypes.h>
   5 #include <sys/quota.h>
   6 #include <sys/types.h>
   7
   8 /* Wrapper around the QCMD() macro of linux/quota.h that removes some undefined behaviour. A typical quota
   9  * command such as QCMD(Q_GETQUOTA, USRQUOTA) cannot be resolved on platforms where "int" is 32bit, as it is
  10  * larger than INT_MAX. Yikes, because that are basically all platforms Linux supports. Let's add a wrapper
  11  * that explicitly takes its arguments as unsigned 32bit, and then converts the shift result explicitly to
  12  * int, acknowledging the undefined behaviour of the kernel headers. This doesn't remove the undefined
  13  * behaviour, but it stops ubsan from complaining about it. */
  14 static inline int QCMD_FIXED(uint32_t cmd, uint32_t type) {
  15         return (int) QCMD(cmd, type);
  16 }
  17
  18 int quotactl_devno(int cmd, dev_t devno, int id, void *addr);
  19 int quotactl_path(int cmd, const char *path, int id, void *addr);