Release 4.11 fs/lockd/svc4proc.c

/*
 * linux/fs/lockd/svc4proc.c
 *
 * Lockd server procedures. We don't implement the NLM_*_RES 
 * procedures because we don't use the async procedures.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/time.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/sunrpc/svc_xprt.h>


#define NLMDBG_FACILITY		NLMDBG_CLIENT

/*
 * 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:
	nlmsvc_release_host(host);
 	if (error)
		return error;	
	return nlm_lck_denied_nolocks;
}

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2
1.02%
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1
0.51%
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197
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5
100.00%

/*
 * NULL: Test for presence of service
 */

static __be32

nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
{
	dprintk("lockd: NULL          called\n");
	return rpc_success;
}

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/*
 * TEST: Check for conflicting lock
 */

static __be32

nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;
	__be32 rc = rpc_success;

	dprintk("lockd: TEST4        called\n");
	resp->cookie = argp->cookie;

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now check for conflicting locks */
	resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
	if (resp->status == nlm_drop_reply)
		rc = rpc_drop_reply;
	else
		dprintk("lockd: TEST4        status %d\n", ntohl(resp->status));

	nlmsvc_release_host(host);
	nlm_release_file(file);
	return rc;
}

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8
5.37%
1
11.11%
Jeff Layton
2
1.34%
1
11.11%
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1
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1
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1
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static __be32

nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
				         struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;
	__be32 rc = rpc_success;

	dprintk("lockd: LOCK          called\n");

	resp->cookie = argp->cookie;

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

#if 0
	/* If supplied state doesn't match current state, we assume it's
         * an old request that time-warped somehow. Any error return would
         * do in this case because it's irrelevant anyway.
         *
         * NB: We don't retrieve the remote host's state yet.
         */
	if (host->h_nsmstate && host->h_nsmstate != argp->state) {
                resp->status = nlm_lck_denied_nolocks;
        } else
#endif

	/* Now try to lock the file */
	resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
					argp->block, &argp->cookie,
					argp->reclaim);
	if (resp->status == nlm_drop_reply)
		rc = rpc_drop_reply;
	else
		dprintk("lockd: LOCK         status %d\n", ntohl(resp->status));

	nlmsvc_release_host(host);
	nlm_release_file(file);
	return rc;
}

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Neil Brown
8
5.03%
1
11.11%
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4
2.52%
1
11.11%
Jeff Layton
2
1.26%
1
11.11%
Al Viro
1
0.63%
1
11.11%
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1
0.63%
1
11.11%
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1
0.63%
1
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159
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9
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static __be32

nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: CANCEL        called\n");

	resp->cookie = argp->cookie;

	/* Don't accept requests during grace period */
	if (locks_in_grace(SVC_NET(rqstp))) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Try to cancel request. */
	resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);

	dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
	nlmsvc_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

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8
5.56%
1
16.67%
Al Viro
1
0.69%
1
16.67%
J. Bruce Fields
1
0.69%
1
16.67%
Chuck Lever
1
0.69%
1
16.67%
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144
100.00%
6
100.00%

/*
 * UNLOCK: release a lock
 */

static __be32

nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
				           struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: UNLOCK        called\n");

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (locks_in_grace(SVC_NET(rqstp))) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to remove the lock */
	resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);

	dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
	nlmsvc_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

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8
5.56%
1
16.67%
Al Viro
1
0.69%
1
16.67%
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1
0.69%
1
16.67%
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1
0.69%
1
16.67%
Total
144
100.00%
6
100.00%

/*
 * GRANTED: A server calls us to tell that a process' lock request
 * was granted
 */

static __be32

nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	resp->cookie = argp->cookie;

	dprintk("lockd: GRANTED       called\n");
	resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
	dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
	return rpc_success;
}

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3
4.55%
1
20.00%
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1
1.52%
1
20.00%
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66
100.00%
5
100.00%

/*
 * This is the generic lockd callback for async RPC calls
 */


static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
{
	dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
			-task->tk_status);
}

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1
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static void nlm4svc_callback_release(void *data)
{
	nlmsvc_release_call(data);
}

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static const struct rpc_call_ops nlm4svc_callback_ops = {
	.rpc_call_done = nlm4svc_callback_exit,
	.rpc_release = nlm4svc_callback_release,
};

/*
 * `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 nlm4svc_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);
	nlmsvc_release_host(host);
	if (call == NULL)
		return rpc_system_err;

	stat = func(rqstp, argp, &call->a_res);
	if (stat != 0) {
		nlmsvc_release_call(call);
		return stat;
	}

	call->a_flags = RPC_TASK_ASYNC;
	if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
		return rpc_system_err;
	return rpc_success;
}

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1
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8
5.13%
2
28.57%
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3
1.92%
1
14.29%
Chuck Lever
1
0.64%
1
14.29%
Total
156
100.00%
7
100.00%



static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: TEST_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
}

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1
2.70%
1
25.00%
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37
100.00%
4
100.00%



static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void	     *resp)
{
	dprintk("lockd: LOCK_MSG      called\n");
	return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
}

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2
5.41%
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1
2.70%
1
25.00%
Total
37
100.00%
4
100.00%



static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
					       void	       *resp)
{
	dprintk("lockd: CANCEL_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
}

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static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                               void            *resp)
{
	dprintk("lockd: UNLOCK_MSG    called\n");
	return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
}

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static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
                                                void            *resp)
{
	dprintk("lockd: GRANTED_MSG   called\n");
	return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
}

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100.00%

/*
 * SHARE: create a DOS share or alter existing share.
 */

static __be32

nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
				          struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: SHARE         called\n");

	resp->cookie = argp->cookie;

	/* Don't accept new lock requests during grace period */
	if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to create the share */
	resp->status = nlmsvc_share_file(host, file, argp);

	dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
	nlmsvc_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

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4.20%
1
16.67%
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1
0.70%
1
16.67%
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1
0.70%
1
16.67%
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1
0.70%
1
16.67%
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143
100.00%
6
100.00%

/*
 * UNSHARE: Release a DOS share.
 */

static __be32

nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	struct nlm_host	*host;
	struct nlm_file	*file;

	dprintk("lockd: UNSHARE       called\n");

	resp->cookie = argp->cookie;

	/* Don't accept requests during grace period */
	if (locks_in_grace(SVC_NET(rqstp))) {
		resp->status = nlm_lck_denied_grace_period;
		return rpc_success;
	}

	/* Obtain client and file */
	if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
		return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;

	/* Now try to lock the file */
	resp->status = nlmsvc_unshare_file(host, file, argp);

	dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
	nlmsvc_release_host(host);
	nlm_release_file(file);
	return rpc_success;
}

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6
4.35%
1
16.67%
Chuck Lever
1
0.72%
1
16.67%
J. Bruce Fields
1
0.72%
1
16.67%
Al Viro
1
0.72%
1
16.67%
Total
138
100.00%
6
100.00%

/*
 * NM_LOCK: Create an unmonitored lock
 */

static __be32

nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
				            struct nlm_res  *resp)
{
	dprintk("lockd: NM_LOCK       called\n");

	argp->monitor = 0;		/* just clean the monitor flag */
	return nlm4svc_proc_lock(rqstp, argp, resp);
}

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2
100.00%

/*
 * FREE_ALL: Release all locks and shares held by client
 */

static __be32

nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
					     void            *resp)
{
	struct nlm_host	*host;

	/* Obtain client */
	if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
		return rpc_success;

	nlmsvc_free_host_resources(host);
	nlmsvc_release_host(host);
	return rpc_success;
}

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1.79%
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56
100.00%
3
100.00%

/*
 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 */

static __be32

nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
					      void	        *resp)
{
	dprintk("lockd: SM_NOTIFY     called\n");

	if (!nlm_privileged_requester(rqstp)) {
		char buf[RPC_MAX_ADDRBUFLEN];
		printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
				svc_print_addr(rqstp, buf, sizeof(buf)));
		return rpc_system_err;
	}

	nlm_host_rebooted(SVC_NET(rqstp), argp);
	return rpc_success;
}

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5
6.67%
1
16.67%
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1
1.33%
1
16.67%
Olaf Kirch
1
1.33%
1
16.67%
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75
100.00%
6
100.00%

/*
 * client sent a GRANTED_RES, let's remove the associated block
 */

static __be32

nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
                                                void            *resp)
{
        if (!nlmsvc_ops)
                return rpc_success;

        dprintk("lockd: GRANTED_RES   called\n");

        nlmsvc_grant_reply(&argp->cookie, argp->status);
        return rpc_success;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
47
97.92%
1
50.00%
Al Viro
1
2.08%
1
50.00%
Total
48
100.00%
2
100.00%

/*
 * NLM Server procedures.
 */


#define nlm4svc_encode_norep	nlm4svc_encode_void

#define nlm4svc_decode_norep	nlm4svc_decode_void

#define nlm4svc_decode_testres	nlm4svc_decode_void

#define nlm4svc_decode_lockres	nlm4svc_decode_void

#define nlm4svc_decode_unlockres	nlm4svc_decode_void

#define nlm4svc_decode_cancelres	nlm4svc_decode_void

#define nlm4svc_decode_grantedres	nlm4svc_decode_void


#define nlm4svc_proc_none	nlm4svc_proc_null

#define nlm4svc_proc_test_res	nlm4svc_proc_null

#define nlm4svc_proc_lock_res	nlm4svc_proc_null

#define nlm4svc_proc_cancel_res	nlm4svc_proc_null

#define nlm4svc_proc_unlock_res	nlm4svc_proc_null



struct nlm_void			{ int dummy; };


#define PROC(name, xargt, xrest, argt, rest, respsize)	\
 { .pc_func      = (svc_procfunc) nlm4svc_proc_##name,   \
   .pc_decode   = (kxdrproc_t) nlm4svc_decode_##xargt,  \
   .pc_encode   = (kxdrproc_t) nlm4svc_encode_##xrest,  \
   .pc_release  = NULL,                                 \
   .pc_argsize  = sizeof(struct nlm_##argt),            \
   .pc_ressize  = sizeof(struct nlm_##rest),            \
   .pc_xdrressize = respsize,                           \
 }

#define	Ck	(1+XDR_QUADLEN(NLM_MAXCOOKIELEN))	
/* cookie */

#define	No	(1+1024/4)				
/* netobj */

#define	St	1					
/* status */

#define	Rg	4					
/* range (offset + length) */

struct svc_procedure		nlmsvc_procedures4[] = {
  PROC(null,		void,		void,		void,	void, 1),
  PROC(test,		testargs,	testres,	args,	res, Ck+St+2+No+Rg),
  PROC(lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(cancel,		cancargs,	res,		args,	res, Ck+St),
  PROC(unlock,		unlockargs,	res,		args,	res, Ck+St),
  PROC(granted,		testargs,	res,		args,	res, Ck+St),
  PROC(test_msg,	testargs,	norep,		args,	void, 1),
  PROC(lock_msg,	lockargs,	norep,		args,	void, 1),
  PROC(cancel_msg,	cancargs,	norep,		args,	void, 1),
  PROC(unlock_msg,	unlockargs,	norep,		args,	void, 1),
  PROC(granted_msg,	testargs,	norep,		args,	void, 1),
  PROC(test_res,	testres,	norep,		res,	void, 1),
  PROC(lock_res,	lockres,	norep,		res,	void, 1),
  PROC(cancel_res,	cancelres,	norep,		res,	void, 1),
  PROC(unlock_res,	unlockres,	norep,		res,	void, 1),
  PROC(granted_res,	res,		norep,		res,	void, 1),
  /* statd callback */
  PROC(sm_notify,	reboot,		void,		reboot,	void, 1),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(none,		void,		void,		void,	void, 0),
  PROC(share,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(unshare,		shareargs,	shareres,	args,	res, Ck+St+1),
  PROC(nm_lock,		lockargs,	res,		args,	res, Ck+St),
  PROC(free_all,	notify,		void,		args,	void, 1),

};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
1706
73.73%
1
2.78%
Trond Myklebust
265
11.45%
4
11.11%
Neil Brown
157
6.78%
5
13.89%
Stanislav Kinsbursky
37
1.60%
1
2.78%
Chuck Lever
30
1.30%
7
19.44%
Al Viro
27
1.17%
3
8.33%
Marc Eshel
25
1.08%
3
8.33%
Olaf Kirch
21
0.91%
2
5.56%
Oleg Drokin
20
0.86%
1
2.78%
J. Bruce Fields
8
0.35%
2
5.56%
Andrey Ryabinin
5
0.22%
1
2.78%
Linus Torvalds
5
0.22%
1
2.78%
Jeff Layton
4
0.17%
2
5.56%
Harvey Harrison
2
0.09%
1
2.78%
Dave Jones
1
0.04%
1
2.78%
Ed Schouten
1
0.04%
1
2.78%
Total
2314
100.00%
36
100.00%
Directory: fs/lockd

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