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NFSv4: Ensure we honour NFS_DELEGATION_RETURNING in nfs_inode_set_delegation()

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Ensure that nfs_inode_set_delegation() doesn't inadvertently detach a
delegation that is already in the process of being returned.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-02-27 14:25:50 -05:00
parent b04b22f4ca
commit ade04647dd
1 changed files with 4 additions and 1 deletions
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3
fs/nfs/delegation.c
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@ -370,6 +370,9 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
delegation = NULL; delegation = NULL;
goto out; goto out;
} }
if (test_and_set_bit(NFS_DELEGATION_RETURNING,
&old_delegation->flags))
goto out;
freeme = nfs_detach_delegation_locked(nfsi, freeme = nfs_detach_delegation_locked(nfsi,
old_delegation, clp); old_delegation, clp);
if (freeme == NULL) if (freeme == NULL)