[Bugs] [Bug 1695399] With parallel-readdir enabled, deleting a directory containing stale linkto files fails with "Directory not empty"

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1695399



--- Comment #1 from Nithya Balachandran <nbalacha at redhat.com> ---
RCA:

rm -rf <dir> works by first listing and unlinking all entries in <dir> and then
calling an rmdir <dir>.
As DHT readdirp does not return linkto files in the listing, they are not
unlinked as part of the rm -rf itself. dht_rmdir handles this by performing a
readdirp internally on <dir> and deleting all stale linkto files before
proceeding with the actual rmdir operation.

When parallel-readdir is enabled, the rda xlator is loaded below dht in the
graph and proactively lists and caches entries when an opendir is performed.
Entries are returned from this cache for any subsequent readdirp calls on the
directory that was opened.
DHT uses the presence of the trusted.glusterfs.dht.linkto xattr to determine
whether a file is a linkto file. As this call to opendir does not set
trusted.glusterfs.dht.linkto in the list of requested xattrs for the opendir
call, the cached entries do not contain this xattr value.  As none of the
entries returned will have the xattr, DHT believes they are all data files and
fails the rmdir with ENOTEMPTY.

Turning off parallel-readdir allows the rm -rf to succeed.


Upstream master:  https://review.gluster.org/22160

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