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NFSv4: Ensure that we recover from the OPEN + OPEN_CONFIRM BAD_STATEID race

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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>
This commit is contained in:
Trond Myklebust 2005-10-18 14:20:21 -07:00
parent b8e5c4c297
commit 550f57470c
1 changed files with 10 additions and 0 deletions
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10
fs/nfs/nfs4proc.c
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@ -785,6 +785,16 @@ static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry,
exception.retry = 1;
continue;
}
/*
* BAD_STATEID on OPEN means that the server cancelled our
* state before it received the OPEN_CONFIRM.
* Recover by retrying the request as per the discussion
* on Page 181 of RFC3530.
*/
if (status == -NFS4ERR_BAD_STATEID) {
exception.retry = 1;
continue;
}
res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
status, &exception));
} while (exception.retry);