mount_attr

Linux kernel headers

#include <sys/mount.h>

struct mount_attr {
    u64 attr_set;     /* Mount properties to set */
    u64 attr_clr;     /* Mount properties to clear */
    u64 propagation;  /* Mount propagation type */
    u64 userns_fd;    /* User namespace file descriptor */
    /* ... */
};

Specifies which mount properties should be changed with mount_setattr(2).

The fields are as follows:

.attr_set

This field specifies which MOUNT_ATTR_* attribute flags to set.

.attr_clr

This field specifies which MOUNT_ATTR_* attribute flags to clear.

.propagation

This field specifies what mount propagation will be applied. The valid values of this field are the same propagation types described in mount_namespaces(7).

.userns_fd

This field specifies a file descriptor that indicates which user namespace to use as a reference for ID-mapped mounts with MOUNT_ATTR_IDMAP.

Linux.

Linux 5.12. glibc 2.36.

Extra fields may be appended to the structure, with a zero value in a new field resulting in the kernel behaving as though that extension field was not present. Therefore, a user must zero-fill this structure on initialization.

mount_setattr(2)