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nfsd4: don't pretend to support write delegations

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The delegation code mostly pretends to support either read or write
delegations.  However, correct support for write delegations would
require, for example, breaking of delegations (and/or implementation of
cb_getattr) on stat.  Currently all that stops us from handing out
delegations is a subtle reference-counting issue.

Avoid confusion by adding an earlier check that explicitly refuses write
delegations.

For now, though, I'm not going so far as to rip out existing
half-support for write delegations, in case we get around to using that
soon.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2010-07-28 10:08:57 -04:00
parent fa0a21269f
commit c3e4808086
1 changed files with 7 additions and 0 deletions
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7
fs/nfsd/nfs4state.c
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@ -170,6 +170,13 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_f
struct nfs4_cb_conn *cb = &stp->st_stateowner->so_client->cl_cb_conn;
dprintk("NFSD alloc_init_deleg\n");
/*
* Major work on the lease subsystem (for example, to support
* calbacks on stat) will be required before we can support
* write delegations properly.
*/
if (type != NFS4_OPEN_DELEGATE_READ)
return NULL;
if (fp->fi_had_conflict)
return NULL;
if (num_delegations > max_delegations)