diff options
| author | Steve Dickson <steved@redhat.com> | 2013-05-15 14:51:49 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2013-07-01 17:23:07 -0400 |
| commit | 9a0590aec3ca5e86a64b87e004244abc4dd1faf9 (patch) | |
| tree | f3864074aa12bace1ff2fd082ae1a839cfc4b547 /fs/nfsd/nfs4state.c | |
| parent | 57569a707082a337e4a61a657521d79cac3528bf (diff) | |
| download | linux-9a0590aec3ca5e86a64b87e004244abc4dd1faf9.tar.bz2 | |
NFSD: Don't give out read delegations on creates
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>
Diffstat (limited to 'fs/nfsd/nfs4state.c')
| -rw-r--r-- | fs/nfsd/nfs4state.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index c4f63399832c..44dcea96bfcb 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -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; |