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nfsd: Ensure sampling of the write verifier is atomic with the write

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When doing an unstable write, we need to ensure that we sample the
write verifier before releasing the lock, and allowing a commit to
the same file to proceed.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust
2020-01-06 13:40:37 -05:00
committed by J. Bruce Fields
parent 524ff1af22
commit 19e0663ff9
7 changed files with 19 additions and 15 deletions
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8
fs/nfsd/nfs3xdr.c
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@@ -747,17 +747,13 @@ int
nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p)
{
struct nfsd3_writeres *resp = rqstp->rq_resp;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
__be32 verf[2];
p = encode_wcc_data(rqstp, p, &resp->fh);
if (resp->status == 0) {
*p++ = htonl(resp->count);
*p++ = htonl(resp->committed);
/* unique identifier, y2038 overflow can be ignored */
nfsd_copy_boot_verifier(verf, nn);
*p++ = verf[0];
*p++ = verf[1];
*p++ = resp->verf[0];
*p++ = resp->verf[1];
}
return xdr_ressize_check(rqstp, p);
}