mount_attr(2type)                                            mount_attr(2type)

NAME
       mount_attr - what mount properties to set and clear

LIBRARY
       Linux kernel headers

SYNOPSIS
       #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 */
           /* ... */
       };

DESCRIPTION
       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.

STANDARDS
       Linux.

HISTORY
       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.

SEE ALSO
       mount_setattr(2)

Linux man-pages 6.17              2025-09-21                 mount_attr(2type)