[PATCH 2/3] nfsd4: delay setting current_fh in open

J. Bruce Fields
2014-01-26T20:59:24Z

This is basically a no-op, to simplify a following patch.

Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
fs/nfsd/nfs4proc.c | 37 ++++++++++++++++++++-----------------
1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index dadff09..844813a 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -230,17 +230,16 @@ static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate
}

static __be32
-do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
+do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
{
struct svc_fh *current_fh = &cstate->current_fh;
- struct svc_fh *resfh;
int accmode;
__be32 status;

- resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
- if (!resfh)
+ *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
+ if (!*resfh)
return nfserr_jukebox;
- fh_init(resfh, NFS4_FHSIZE);
+ fh_init(*resfh, NFS4_FHSIZE);
open->op_truncate = 0;

if (open->op_create) {
@@ -265,12 +264,12 @@ do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, stru
*/
status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
open->op_fname.len, &open->op_iattr,
- resfh, open->op_createmode,
+ *resfh, open->op_createmode,
(u32 *)open->op_verf.data,
&open->op_truncate, &open->op_created);

if (!status && open->op_label.len)
- nfsd4_security_inode_setsecctx(resfh, &open->op_label, open->op_bmval);
+ nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);

/*
* Following rfc 3530 14.2.16, use the returned bitmask
@@ -282,29 +281,26 @@ do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, stru
FATTR4_WORD1_TIME_MODIFY);
} else {
status = nfsd_lookup(rqstp, current_fh,
- open->op_fname.data, open->op_fname.len, resfh);
+ open->op_fname.data, open->op_fname.len, *resfh);
fh_unlock(current_fh);
}
if (status)
goto out;
- status = nfsd_check_obj_isreg(resfh);
+ status = nfsd_check_obj_isreg(*resfh);
if (status)
goto out;

if (is_create_with_attrs(open) && open->op_acl != NULL)
- do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
+ do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);

- nfsd4_set_open_owner_reply_cache(cstate, open, resfh);
+ nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
accmode = NFSD_MAY_NOP;
if (open->op_created ||
open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
accmode |= NFSD_MAY_OWNER_OVERRIDE;
- status = do_open_permission(rqstp, resfh, open, accmode);
+ status = do_open_permission(rqstp, *resfh, open, accmode);
set_change_info(&open->op_cinfo, current_fh);
- fh_dup2(current_fh, resfh);
out:
- fh_put(resfh);
- kfree(resfh);
return status;
}

@@ -357,6 +353,7 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_open *open)
{
__be32 status;
+ struct svc_fh *resfh = NULL;
struct nfsd4_compoundres *resp;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
@@ -423,7 +420,7 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_DELEGATE_CUR:
case NFS4_OPEN_CLAIM_NULL:
- status = do_open_lookup(rqstp, cstate, open);
+ status = do_open_lookup(rqstp, cstate, open, &resfh);
if (status)
goto out;
break;
@@ -439,6 +436,7 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
status = do_open_fhandle(rqstp, cstate, open);
if (status)
goto out;
+ resfh = &cstate->current_fh;
break;
case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
case NFS4_OPEN_CLAIM_DELEGATE_PREV:
@@ -458,9 +456,14 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
* successful, it (1) truncates the file if open->op_truncate was
* set, (2) sets open->op_stateid, (3) sets open->op_delegation.
*/
- status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
+ status = nfsd4_process_open2(rqstp, resfh, open);
WARN_ON(status && open->op_created);
out:
+ if (resfh && resfh != &cstate->current_fh) {
+ fh_dup2(&cstate->current_fh, resfh);
+ fh_put(resfh);
+ kfree(resfh);
+ }
nfsd4_cleanup_open_state(open, status);
if (open->op_openowner && !nfsd4_has_session(cstate))
cstate->replay_owner = &open->op_openowner->oo_owner;
--
1.7.9.5