[PATCH 1/2] nfsd4: fix use of op_share_access

[PATCH 1/2] nfsd4: fix use of op_share_access

[J. Bruce Fields]

NFSv4.1 adds additional flags to the share_access argument of the open
call.  These flags need to be masked out in some of the existing code,
but current code does that inconsistently.

Tested-by: Michael Groshans <groshans@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
---
 fs/nfsd/nfs4state.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 12f7109..1176708 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2255,6 +2255,13 @@ find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
 	return NULL;
 }
 
+int share_access_to_flags(u32 share_access)
+{
+	share_access &= ~NFS4_SHARE_WANT_MASK;
+
+	return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
+}
+
 static __be32
 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
 		struct nfs4_delegation **dp)
@@ -2265,8 +2272,7 @@ nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
 	*dp = find_delegation_file(fp, &open->op_delegate_stateid);
 	if (*dp == NULL)
 		goto out;
-	flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
-						RD_STATE : WR_STATE;
+	flags = share_access_to_flags(open->op_share_access);
 	status = nfs4_check_delegmode(*dp, flags);
 	if (status)
 		*dp = NULL;
@@ -2358,6 +2364,7 @@ nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_sta
 	struct file *filp = stp->st_vfs_file;
 	struct inode *inode = filp->f_path.dentry->d_inode;
 	unsigned int share_access, new_writer;
+	u32 op_share_access;
 	__be32 status;
 
 	set_access(&share_access, stp->st_access_bmap);
@@ -2380,8 +2387,9 @@ nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_sta
 		return status;
 	}
 	/* remember the open */
-	filp->f_mode |= open->op_share_access;
-	__set_bit(open->op_share_access, &stp->st_access_bmap);
+	op_share_access = open->op_share_access & ~NFS4_SHARE_WANT_MASK;
+	filp->f_mode |= op_share_access;
+	__set_bit(op_share_access, &stp->st_access_bmap);
 	__set_bit(open->op_share_deny, &stp->st_deny_bmap);
 
 	return nfs_ok;
-- 
1.7.0.4

[PATCH 2/2] nfsd4: fix max_ops session negotiation

[J. Bruce Fields]

We shouldn't accept the client's (possibly lower) max_ops if we don't
actually intend to enforce it; according to the spec:

	For the fore channel, the server MAY change the requested value.
	After the session is created, if a requester sends a COMPOUND or
	CB_COMPOUND with more operations than ca_maxoperations, the
	replier MUST return NFS4ERR_TOO_MANY_OPS.

Reported-by: Michael Groshans <groshans@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
---
 fs/nfsd/nfs4state.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 1176708..0d08b0c 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -485,9 +485,7 @@ static int init_forechannel_attrs(struct svc_rqst *rqstp,
 		fchan->maxresp_sz = maxcount;
 	session_fchan->maxresp_sz = fchan->maxresp_sz;
 
-	/* Use the client's maxops if possible */
-	if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND)
-		fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
+	fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
 	session_fchan->maxops = fchan->maxops;
 
 	/* FIXME: Error means no more DRC pages so the server should
-- 
1.7.0.4