NFSv4: Fix a potential state manager deadlock when returning delegations

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The nfsv4 state manager could potentially deadlock inside
__nfs_inode_return_delegation() if the server reboots, so that the calls to
nfs_msync_inode() end up waiting on state recovery to complete.

Also ensure that if a server reboot or network partition causes us to have
to stop returning delegations, that NFS4CLNT_DELEGRETURN is set so that
the state manager can resume any outstanding delegation returns after it
has dealt with the state recovery situation.

Finally, ensure that the state manager doesn't wait for the DELEGRETURN
call to complete. It doesn't need to, and that too can cause a deadlock.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

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This commit is contained in:

Trond Myklebust 2009-12-03 08:10:17 -05:00

parent d327cf7449

commit d18cc1fda2

2 changed files with 29 additions and 15 deletions

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42

fs/nfs/delegation.c

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2

fs/nfs/delegation.h

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