[Bug libc/23281] New: FTW_MOUNT must not rely on st_dev to check whether a file is in the same mountpoint

["fabian at ritter-vogt dot de" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23281

            Bug ID: 23281
           Summary: FTW_MOUNT must not rely on st_dev to check whether a
                    file is in the same mountpoint
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: fabian@ritter-vogt.de
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

st_dev is not guaranteed to be the same for files on the same mountpoint.

This is guaranteed to not be the case on overlayfs, where FTW_MOUNT results in
the callback not being called for *any* files.

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