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NLM/lockd: Ensure client locking calls use correct credentials 

Now that we've added the 'generic' credentials (that are independent of the
rpc_client) to the nfs_open_context, we can use those in the NLM client to
ensure that the lock/unlock requests are authenticated to whoever
originally opened the file.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2008-04-02 14:44:05 -04:00
parent c4d7c402b7
commit d11d10cc05
1 changed files with 14 additions and 9 deletions
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23
fs/lockd/clntproc.c
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@ -247,7 +247,7 @@ static int nlm_wait_on_grace(wait_queue_head_t *queue)
* Generic NLM call
*/
static int
nlmclnt_call(struct nlm_rqst *req, u32 proc)
nlmclnt_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc)
{
struct nlm_host *host = req->a_host;
struct rpc_clnt *clnt;
@ -256,6 +256,7 @@ nlmclnt_call(struct nlm_rqst *req, u32 proc)
struct rpc_message msg = {
.rpc_argp = argp,
.rpc_resp = resp,
.rpc_cred = cred,
};
int status;
@ -390,11 +391,12 @@ int nlm_async_reply(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *t
* completion in order to be able to correctly track the lock
* state.
*/
static int nlmclnt_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
static int nlmclnt_async_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
{
struct rpc_message msg = {
.rpc_argp = &req->a_args,
.rpc_resp = &req->a_res,
.rpc_cred = cred,
};
struct rpc_task *task;
int err;
@ -415,7 +417,7 @@ nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl)
{
int status;
status = nlmclnt_call(req, NLMPROC_TEST);
status = nlmclnt_call(nfs_file_cred(fl->fl_file), req, NLMPROC_TEST);
if (status < 0)
goto out;
@ -506,6 +508,7 @@ static int do_vfs_lock(struct file_lock *fl)
static int
nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
{
struct rpc_cred *cred = nfs_file_cred(fl->fl_file);
struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
struct nlm_wait *block = NULL;
@ -534,7 +537,7 @@ again:
for(;;) {
/* Reboot protection */
fl->fl_u.nfs_fl.state = host->h_state;
status = nlmclnt_call(req, NLMPROC_LOCK);
status = nlmclnt_call(cred, req, NLMPROC_LOCK);
if (status < 0)
break;
/* Did a reclaimer thread notify us of a server reboot? */
@ -595,7 +598,7 @@ out_unlock:
up_read(&host->h_rwsem);
fl->fl_type = fl_type;
fl->fl_flags = fl_flags;
nlmclnt_async_call(req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
nlmclnt_async_call(cred, req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
return status;
}
@ -619,8 +622,8 @@ nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl)
nlmclnt_setlockargs(req, fl);
req->a_args.reclaim = 1;
if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0
&& req->a_res.status == nlm_granted)
status = nlmclnt_call(nfs_file_cred(fl->fl_file), req, NLMPROC_LOCK);
if (status >= 0 && req->a_res.status == nlm_granted)
return 0;
printk(KERN_WARNING "lockd: failed to reclaim lock for pid %d "
@ -669,7 +672,8 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
}
atomic_inc(&req->a_count);
status = nlmclnt_async_call(req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
status = nlmclnt_async_call(nfs_file_cred(fl->fl_file), req,
NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
if (status < 0)
goto out;
@ -738,7 +742,8 @@ static int nlmclnt_cancel(struct nlm_host *host, int block, struct file_lock *fl
req->a_args.block = block;
atomic_inc(&req->a_count);
status = nlmclnt_async_call(req, NLMPROC_CANCEL, &nlmclnt_cancel_ops);
status = nlmclnt_async_call(nfs_file_cred(fl->fl_file), req,
NLMPROC_CANCEL, &nlmclnt_cancel_ops);
if (status == 0 && req->a_res.status == nlm_lck_denied)
status = -ENOLCK;
nlm_release_call(req);