/*
* `Async' versions of the above service routines. They aren't really,
* because we send the callback before the reply proper. I hope this
* doesn't break any clients.
*/
static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
__be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *))
{
struct nlm_host *host;
struct nlm_rqst *call;
__be32 stat;
host = nlmsvc_lookup_host(rqstp,
argp->lock.caller,
argp->lock.len);
if (host == NULL)
return rpc_system_err;
call = nlm_alloc_call(host);
if (call == NULL)
return rpc_system_err;
stat = func(rqstp, argp, &call->a_res);
if (stat != 0) {
nlm_release_call(call);
return stat;
}
call->a_flags = RPC_TASK_ASYNC;
if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0)
return rpc_system_err;
return rpc_success;
}
/*
* Create a block and initialize it.
*
* Note: we explicitly set the cookie of the grant reply to that of
* the blocked lock request. The spec explicitly mentions that the client
* should _not_ rely on the callback containing the same cookie as the
* request, but (as I found out later) that's because some implementations
* do just this. Never mind the standards comittees, they support our
* logging industries.
*/
static inline struct nlm_block *
nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
struct nlm_lock *lock, struct nlm_cookie *cookie)
{
struct nlm_block *block;
struct nlm_host *host;
struct nlm_rqst *call;
/* Create host handle for callback */
host = nlmclnt_lookup_host(&rqstp->rq_addr,
rqstp->rq_prot, rqstp->rq_vers);
if (host == NULL)
return NULL;
/* Allocate memory for block, and initialize arguments */
if (!(block = (struct nlm_block *) kmalloc(sizeof(*block), GFP_KERNEL)))
goto failed;
memset(block, 0, sizeof(*block));
locks_init_lock(&block->b_call.a_args.lock.fl);
locks_init_lock(&block->b_call.a_res.lock.fl);
block->b_host = nlmsvc_lookup_host(rqstp);
if (block->b_host == NULL) {
goto failed_free;
}
if (!nlmclnt_setgrantargs(&block->b_call, lock))
goto failed_free;
/* Set notifier function for VFS, and init args */
block->b_call.a_args.lock.fl.fl_notify = nlmsvc_notify_blocked;
block->b_call.a_args.cookie = *cookie; /* see above */
dprintk("lockd: created block %p...\n", block);
/* Create and initialize the block */
block->b_daemon = rqstp->rq_server;
block->b_file = file;
/* Add to file's list of blocks */
block->b_fnext = file->f_blocks;
file->f_blocks = block;
/* Set up RPC arguments for callback */
call = &block->b_call;
call->a_host = host;
call->a_flags = RPC_TASK_ASYNC;
return block;
failed_free:
kfree(block);
failed:
nlm_release_host(host);
return NULL;
}
/*
* Obtain client and file from arguments
*/
static u32
nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_host **hostp, struct nlm_file **filp)
{
struct nlm_host *host = NULL;
struct nlm_file *file = NULL;
struct nlm_lock *lock = &argp->lock;
u32 error = 0;
/* nfsd callbacks must have been installed for this procedure */
if (!nlmsvc_ops)
return nlm_lck_denied_nolocks;
/* Obtain handle for client host */
if (rqstp->rq_client == NULL) {
printk(KERN_NOTICE
"lockd: unauthenticated request from (%08x:%d)\n",
ntohl(rqstp->rq_addr.sin_addr.s_addr),
ntohs(rqstp->rq_addr.sin_port));
return nlm_lck_denied_nolocks;
}
/* Obtain host handle */
if (!(host = nlmsvc_lookup_host(rqstp))
|| (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0))
goto no_locks;
*hostp = host;
/* Obtain file pointer. Not used by FREE_ALL call. */
if (filp != NULL) {
if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
goto no_locks;
*filp = file;
/* Set up the missing parts of the file_lock structure */
lock->fl.fl_file = &file->f_file;
lock->fl.fl_owner = (fl_owner_t) host;
}
return 0;
no_locks:
if (host)
nlm_release_host(host);
if (error)
return error;
return nlm_lck_denied_nolocks;
}
/*
* Obtain client and file from arguments
*/
static __be32
nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_host **hostp, struct nlm_file **filp)
{
struct nlm_host *host = NULL;
struct nlm_file *file = NULL;
struct nlm_lock *lock = &argp->lock;
__be32 error = 0;
/* nfsd callbacks must have been installed for this procedure */
if (!nlmsvc_ops)
return nlm_lck_denied_nolocks;
/* Obtain host handle */
if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
|| (argp->monitor && nsm_monitor(host) < 0))
goto no_locks;
*hostp = host;
/* Obtain file pointer. Not used by FREE_ALL call. */
if (filp != NULL) {
if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
goto no_locks;
*filp = file;
/* Set up the missing parts of the file_lock structure */
lock->fl.fl_file = file->f_file;
lock->fl.fl_owner = (fl_owner_t) host;
lock->fl.fl_lmops = &nlmsvc_lock_operations;
}
return 0;
no_locks:
if (host)
nlm_release_host(host);
if (error)
return error;
return nlm_lck_denied_nolocks;
}
static __be32
nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
struct nlm_host **hostp, struct nlm_file **filp)
{
struct nlm_host *host = NULL;
struct nlm_file *file = NULL;
struct nlm_lock *lock = &argp->lock;
__be32 error = 0;
if (!nlmsvc_ops)
return nlm_lck_denied_nolocks;
if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
|| (argp->monitor && nsm_monitor(host) < 0))
goto no_locks;
*hostp = host;
if (filp != NULL) {
error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
if (error != 0)
goto no_locks;
*filp = file;
lock->fl.fl_file = file->f_file;
lock->fl.fl_owner = (fl_owner_t) host;
lock->fl.fl_lmops = &nlmsvc_lock_operations;
}
return 0;
no_locks:
nlmsvc_release_host(host);
if (error)
return error;
return nlm_lck_denied_nolocks;
}