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NFSv4: Ensure that we recover from the OPEN + OPEN_CONFIRM BAD_STATEID race
If the server is in the unconfirmed OPEN state for a given open owner and receives a second OPEN for the same open owner, it will cancel the state of the first request and set up an OPEN_CONFIRM for the second. This can cause a race that is discussed in rfc3530 on page 181. The following patch allows the client to recover by retrying the original open request. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -785,6 +785,16 @@ static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry,
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exception.retry = 1;
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continue;
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}
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/*
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* BAD_STATEID on OPEN means that the server cancelled our
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* state before it received the OPEN_CONFIRM.
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* Recover by retrying the request as per the discussion
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* on Page 181 of RFC3530.
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*/
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if (status == -NFS4ERR_BAD_STATEID) {
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exception.retry = 1;
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continue;
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}
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res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
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status, &exception));
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} while (exception.retry);
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