[0/5] dfs fixes

Message

Paulo Alcantara Jan. 17, 2023, 12:09 a.m. UTC

Hi Steve,

The most important fix is 1/5 that should fix those random hangs that
we've observed while running dfs tests on buildbot.

I have run twice 50 dfs tests against Windows 2022 and samba 4.16 with
these mount options

	vers=3.1.1,echo_interval=10,{,hard}
	vers=3.0,echo_interval=10,{,hard}
	vers=3.0,echo_interval=10,{,sign}
	vers=3.0,echo_interval=10,{,seal}
	vers=2.1,echo_interval=10,{,hard}
	vers=1.0,echo_interval=10,{,hard}

The only tests which failed (2%) were with SMB1 UNIX extensions
against samba.  readdir(2) was getting STATUS_INVALID_LEVEL from
QUERY_PATH_INFO after failover for some reason -- I'll look into that
when time allows.  Those failures aren't related to this series,
though.

I also did some quick tests with kerberos.

Paulo Alcantara (5):
  cifs: fix potential deadlock in cache_refresh_path()
  cifs: avoid re-lookups in dfs_cache_find()
  cifs: don't take exclusive lock for updating target hints
  cifs: remove duplicate code in __refresh_tcon()
  cifs: handle cache lookup errors different than -ENOENT

 fs/cifs/dfs_cache.c | 185 ++++++++++++++++++++++----------------------
 1 file changed, 94 insertions(+), 91 deletions(-)