Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 71/73] NFSv4.x: Fix handling of partially delegated locks | Date | Thu, 9 May 2013 15:32:34 -0700 |
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3.8-stable review patch. If anyone has any objections, please let me know.
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From: Trond Myklebust <Trond.Myklebust@netapp.com>
commit c5a2a15f8146fdfe45078df7873a6dc1006b3869 upstream.
If a NFS client receives a delegation for a file after it has taken a lock on that file, we can currently end up in a situation where we mistakenly skip unlocking that file.
The following patch swaps an erroneous check in nfs4_proc_unlck for whether or not the file has a delegation to one which checks whether or not we hold a lock stateid for that file.
Reported-by: Chuck Lever <Chuck.Lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Tested-by: Chuck Lever <Chuck.Lever@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/nfs/nfs4proc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -4513,9 +4513,9 @@ static int nfs4_proc_unlck(struct nfs4_s if (status != 0) goto out; /* Is this a delegated lock? */ - if (test_bit(NFS_DELEGATED_STATE, &state->flags)) - goto out; lsp = request->fl_u.nfs4_fl.owner; + if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) + goto out; seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); status = -ENOMEM; if (seqid == NULL)
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