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From: Tavian Barnes <>
Subject: d_type and bind mounts
Date: Mon, 11 Feb 2019 14:59:29 -0500
Message-ID: <> (raw)

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

(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

For reference, the relevant findutils bug is

(Please keep me cc'd, I'm not subscribed to lkml or fsdevel.  Thanks!)

Tavian Barnes

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-11 19:59 Tavian Barnes [this message]
2019-02-11 20:59 ` Dave Chinner

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