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NFSD: Don't give out read delegations on creates

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When an exclusive create is done with the mode bits
set (aka open(testfile, O_CREAT | O_EXCL, 0777)) this
causes a OPEN op followed by a SETATTR op. When a
read delegation is given in the OPEN, it causes
the SETATTR to delay with EAGAIN until the
delegation is recalled.

This patch caused exclusive creates to give out
a write delegation (which turn into no delegation)
which allows the SETATTR seamlessly succeed.

Signed-off-by: Steve Dickson <steved@redhat.com>
[bfields: do this for any CREATE, not just exclusive; comment]
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Steve Dickson 2013-05-15 14:51:49 -04:00 committed by J. Bruce Fields
parent 57569a7070
commit 9a0590aec3
1 changed files with 9 additions and 0 deletions
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9
fs/nfsd/nfs4state.c
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@ -3113,8 +3113,17 @@ nfs4_open_delegation(struct net *net, struct svc_fh *fh,
goto out;
if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
goto out;
/*
* Also, if the file was opened for write or
* create, there's a good chance the client's
* about to write to it, resulting in an
* immediate recall (since we don't support
* write delegations):
*/
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
flag = NFS4_OPEN_DELEGATE_WRITE;
else if (open->op_create == NFS4_OPEN_CREATE)
flag = NFS4_OPEN_DELEGATE_WRITE;
else
flag = NFS4_OPEN_DELEGATE_READ;
break;