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  1. 03 May, 2010 2 commits
    • Neil Brown's avatar
      sunrpc: centralise most calls to svc_xprt_received · b48fa6b9
      Neil Brown authored 
      svc_xprt_received must be called when ->xpo_recvfrom has finished
receiving a message, so that the XPT_BUSY flag will be cleared and
if necessary, requeued for further work.

This call is currently made in each ->xpo_recvfrom function, often
from multiple different points.  In each case it is the earliest point
on a particular path where it is known that the protection provided by
XPT_BUSY is no longer needed.

However there are (still) some error paths which do not call
svc_xprt_received, and requiring each ->xpo_recvfrom to make the call
does not encourage robustness.

So: move the svc_xprt_received call to be made just after the
call to ->xpo_recvfrom(), and move it of the various ->xpo_recvfrom
methods.

This means that it may not be called at the earliest possible instant,
but this is unlikely to be a measurable performance issue.

Note that there are still other calls to svc_xprt_received as it is
also needed when an xprt is newly created.
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
      b48fa6b9
    • J. Bruce Fields's avatar
      nfsd4: fix unlikely race in session replay case · 26c0c75e
      J. Bruce Fields authored 
      In the replay case, the

	renew_client(session->se_client);

happens after we've droppped the sessionid_lock, and without holding a
reference on the session; so there's nothing preventing the session
being freed before we get here.

Thanks to Benny Halevy for catching a bug in an earlier version of this
patch.
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
Acked-by: default avatarBenny Halevy <bhalevy@panasas.com>
      26c0c75e
  3. 22 Apr, 2010 7 commits
  5. 19 Apr, 2010 1 commit
  7. 17 Apr, 2010 1 commit
  9. 02 Apr, 2010 4 commits
  11. 30 Mar, 2010 1 commit
  13. 24 Mar, 2010 1 commit
  15. 22 Mar, 2010 1 commit
    • Jeff Layton's avatar
      nfsd: don't break lease while servicing a COMMIT · 91885258
      Jeff Layton authored 
      This is the second attempt to fix the problem whereby a COMMIT call
causes a lease break and triggers a possible deadlock.

The problem is that nfsd attempts to break a lease on a COMMIT call.
This triggers a delegation recall if the lease is held for a delegation.
If the client is the one holding the delegation and it's the same one on
which it's issuing the COMMIT, then it can't return that delegation
until the COMMIT is complete. But, nfsd won't complete the COMMIT until
the delegation is returned. The client and server are essentially
deadlocked until the state is marked bad (due to the client not
responding on the callback channel).

The first patch attempted to deal with this by eliminating the open of
the file altogether and simply had nfsd_commit pass a NULL file pointer
to the vfs_fsync_range. That would conflict with some work in progress
by Christoph Hellwig to clean up the fsync interface, so this patch
takes a different approach.

This declares a new NFSD_MAY_NOT_BREAK_LEASE access flag that indicates
to nfsd_open that it should not break any leases when opening the file,
and has nfsd_commit set that flag on the nfsd_open call.

For now, this patch leaves nfsd_commit opening the file with write
access since I'm not clear on what sort of access would be more
appropriate.
Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Cc: stable@kernel.org
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
      91885258
  17. 16 Mar, 2010 1 commit
  19. 15 Mar, 2010 1 commit
    • NeilBrown's avatar
      sunrpc: never return expired entries in sunrpc_cache_lookup · d202cce8
      NeilBrown authored 
      If sunrpc_cache_lookup finds an expired entry, remove it from
the cache and return a freshly created non-VALID entry instead.
This ensures that we only ever get a usable entry, or an
entry that will become usable once an update arrives.
i.e. we will never need to repeat the lookup.

This allows us to remove the 'is_expired' test from cache_check
(i.e. from cache_is_valid).  cache_check should never get an expired
entry as 'lookup' will never return one.  If it does happen - due to
inconvenient timing - then just accept it as still valid, it won't be
very much past it's use-by date.
Signed-off-by: default avatarNeilBrown <neilb@suse.de>
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
      d202cce8
  21. 14 Mar, 2010 2 commits
  23. 09 Mar, 2010 1 commit
  25. 08 Mar, 2010 17 commits
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