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nfsd: ensure new clients break delegations 

[ Upstream commit 217fd6f625 ]

If nfsd already has an open file that it plans to use for IO from
another, it may not need to do another vfs open, but it still may need
to break any delegations in case the existing opens are for another
client.

Symptoms are that we may incorrectly fail to break a delegation on a
write open from a different client, when the delegation-holding client
already has a write open.

Fixes: 28df3d1539 ("nfsd: clients don't need to break their own delegations")
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
pull/345/head^2
J. Bruce Fields 2021-04-16 14:00:14 -04:00 committed by Greg Kroah-Hartman
parent b4bf335aca
commit 90e8fa8bdf
1 changed files with 19 additions and 5 deletions
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24
fs/nfsd/nfs4state.c
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@ -4874,6 +4874,11 @@ static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
if (nf)
nfsd_file_put(nf);
status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
access));
if (status)
goto out_put_access;
status = nfsd4_truncate(rqstp, cur_fh, open);
if (status)
goto out_put_access;
@ -6856,11 +6861,20 @@ out:
static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
{
struct nfsd_file *nf;
__be32 err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
if (!err) {
err = nfserrno(vfs_test_lock(nf->nf_file, lock));
nfsd_file_put(nf);
}
__be32 err;
err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
if (err)
return err;
fh_lock(fhp); /* to block new leases till after test_lock: */
err = nfserrno(nfsd_open_break_lease(fhp->fh_dentry->d_inode,
NFSD_MAY_READ));
if (err)
goto out;
err = nfserrno(vfs_test_lock(nf->nf_file, lock));
out:
fh_unlock(fhp);
nfsd_file_put(nf);
return err;
}