Messages in this thread | | | From | Tavian Barnes <> | Date | Mon, 11 Feb 2019 14:59:29 -0500 | Subject | d_type and bind mounts |
| |
It seems that readdir()/getdents() fill d_type from the underlying filesystem, not respecting bind mounts of non-directories:
$ touch mount_point $ sudo mount --bind /dev/null mount_point $ find -name mount_point -type c $ find -name mount_point -type f ./mount_point
(Requires a fairly recent GNU findutils to reproduce, older ones always call stat().) I've seen similar discussions about d_ino being for the underlying file, not the mount point, which people have said is technically a POSIX violation but also unlikely to be fixed. Is the same true of d_type? And is there some workaround a program could use to get the actual type without the overhead of a whole stat() call? For example, a way to tell whether a directory entry is a mount point?
For reference, the relevant findutils bug is https://savannah.gnu.org/bugs/?54913.
(Please keep me cc'd, I'm not subscribed to lkml or fsdevel. Thanks!)
-- Tavian Barnes
| |