[PATCH 0/4] Remove possible deadlocks in nfs_release_page() - V2

[NeilBrown <neilb@suse.de>]

These two patches are updated versions of the last two patches of this
series.  They include the use of congestion to avoid excessive
waiting.

(I'm not resenting 1/4 and 2/4, they are unchanged).

Without the congestion check, I've seen wait times in
try_to_free_pages as long as 208 seconds.
With no waiting at all in nfs_release_page() I've seen wait times as long
as 1.4 seconds.
With the 1 second wait, I've seen 2 seconds.
These numbers will vary based on numerous factors, but it does seem
to suggest that 1 second is a good ball-park number.

NeilBrown

---

NeilBrown (2):
      NFS: avoid deadlocks with loop-back mounted NFS filesystems.
      NFS/SUNRPC: Remove other deadlock-avoidance mechanisms in nfs_release_page()


 fs/nfs/file.c                   |   28 ++++++++++++++++++----------
 fs/nfs/write.c                  |    7 +++++++
 net/sunrpc/sched.c              |    2 --
 net/sunrpc/xprtrdma/transport.c |    2 --
 net/sunrpc/xprtsock.c           |   10 ----------
 5 files changed, 25 insertions(+), 24 deletions(-)

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