On 28/05/2019 16:14, David Howells wrote:
+Then there are attributes that convey information about the mount topology: + + * ``FSINFO_ATTR_MOUNT_INFO`` + + This struct-type attribute conveys information about a mount topology node + rather than a superblock. This includes the ID of the superblock mounted + there and the ID of the mount node, its parent, group, master and + propagation source. It also contains the attribute flags for the mount and + a change notification counter so that it can be quickly determined if that + node changed. + + * ``FSINFO_ATTR_MOUNT_DEVNAME`` + + This string-type attribute returns the "device name" that was supplied when + the mount object was created. + + * ``FSINFO_ATTR_MOUNT_CHILDREN`` + + This is an array-type attribute that conveys a set of structs, each of + which indicates the mount ID of a child and the change counter for that + child. The kernel also tags an extra element on the end that indicates the + ID and change counter of the queried object. This allows a conflicting + change to be quickly detected by comparing the before and after counters. + + * ``FSINFO_ATTR_MOUNT_SUBMOUNT`` + + This is a string-type attribute that conveys the pathname of the Nth + mountpoint under the target mount, relative to the mount root or the + chroot, whichever is closer. These correspond on a 1:1 basis with the + eleemnts in the FSINFO_ATTR_MOUNT_CHROOT list.
FSINFO_ATTR_MOUNT_CHROOT -> FSINFO_ATTR_MOUNT_CHILDREN
