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From: "ppluzhnikov at google dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug libc/12165] New: readdir() skips files with d_ino == 0
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http://sourceware.org/bugzilla/show_bug.cgi?id=12165

           Summary: readdir() skips files with d_ino == 0
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: ppluzhnikov@google.com


As far as I can tell, POSIX or the Single Unix Specification says absolutely
nothing about inode numbers (as far as d_ino == 0 meaning anything at all).

This thread: http://mail.nl.linux.org/kernelnewbies/2003-02/msg00075.html
implies that

A) d_ino == 0 is perfectly OK for a filesystem to have, and
B) there used to be a Linux kernel bug, but it has been fixed "long time ago"
in 2003, so now *really* long time ago.

We've just got a tmpfs directory, where the 32-bit d_ino overflowed and a file
with d_ino == 0 was created. This directory can't be removed, because e.g. 'rm
-rf' doesn't "see" the file -- it removes all the files it does see, then tries
to remove the directory, and gets ENOTEMPTY.

Relevant code in glibc/sysdeps/unix/readdir.c appears to be:

      /* Skip deleted files.  */
    } while (dp->d_ino == 0);

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