[deliverable/linux.git] / drivers / staging / lustre / lustre / include / lustre_import.h

/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2012, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 */
/** \defgroup obd_import PtlRPC import definitions
 * Imports are client-side representation of remote obd target.
 *
 * @{
 */

#ifndef __IMPORT_H
#define __IMPORT_H

/** \defgroup export export
 *
 * @{
 */

#include "lustre_handles.h"
#include "lustre/lustre_idl.h"

/**
 * Adaptive Timeout stuff
 *
 * @{
 */
#define D_ADAPTTO D_OTHER
#define AT_BINS 4		  /* "bin" means "N seconds of history" */
#define AT_FLG_NOHIST 0x1	  /* use last reported value only */

struct adaptive_timeout {
	time64_t	at_binstart;	 /* bin start time */
	unsigned int	at_hist[AT_BINS];    /* timeout history bins */
	unsigned int	at_flags;
	unsigned int	at_current;	  /* current timeout value */
	unsigned int	at_worst_ever;       /* worst-ever timeout value */
	time64_t	at_worst_time;       /* worst-ever timeout timestamp */
	spinlock_t	at_lock;
};

struct ptlrpc_at_array {
	struct list_head       *paa_reqs_array; /** array to hold requests */
	__u32	     paa_size;       /** the size of array */
	__u32	     paa_count;      /** the total count of reqs */
	time64_t     paa_deadline;   /** the earliest deadline of reqs */
	__u32	    *paa_reqs_count; /** the count of reqs in each entry */
};

#define IMP_AT_MAX_PORTALS 8
struct imp_at {
	int		     iat_portal[IMP_AT_MAX_PORTALS];
	struct adaptive_timeout iat_net_latency;
	struct adaptive_timeout iat_service_estimate[IMP_AT_MAX_PORTALS];
};

/** @} */

/** Possible import states */
enum lustre_imp_state {
	LUSTRE_IMP_CLOSED     = 1,
	LUSTRE_IMP_NEW	= 2,
	LUSTRE_IMP_DISCON     = 3,
	LUSTRE_IMP_CONNECTING = 4,
	LUSTRE_IMP_REPLAY     = 5,
	LUSTRE_IMP_REPLAY_LOCKS = 6,
	LUSTRE_IMP_REPLAY_WAIT  = 7,
	LUSTRE_IMP_RECOVER    = 8,
	LUSTRE_IMP_FULL       = 9,
	LUSTRE_IMP_EVICTED    = 10,
};

/** Returns test string representation of numeric import state \a state */
static inline char *ptlrpc_import_state_name(enum lustre_imp_state state)
{
	static char *import_state_names[] = {
		"<UNKNOWN>", "CLOSED",  "NEW", "DISCONN",
		"CONNECTING", "REPLAY", "REPLAY_LOCKS", "REPLAY_WAIT",
		"RECOVER", "FULL", "EVICTED",
	};

	LASSERT(state <= LUSTRE_IMP_EVICTED);
	return import_state_names[state];
}

/**
 * List of import event types
 */
enum obd_import_event {
	IMP_EVENT_DISCON     = 0x808001,
	IMP_EVENT_INACTIVE   = 0x808002,
	IMP_EVENT_INVALIDATE = 0x808003,
	IMP_EVENT_ACTIVE     = 0x808004,
	IMP_EVENT_OCD	= 0x808005,
	IMP_EVENT_DEACTIVATE = 0x808006,
	IMP_EVENT_ACTIVATE   = 0x808007,
};

/**
 * Definition of import connection structure
 */
struct obd_import_conn {
	/** Item for linking connections together */
	struct list_head		oic_item;
	/** Pointer to actual PortalRPC connection */
	struct ptlrpc_connection *oic_conn;
	/** uuid of remote side */
	struct obd_uuid	   oic_uuid;
	/**
	 * Time (64 bit jiffies) of last connection attempt on this connection
	 */
	__u64		     oic_last_attempt;
};

/* state history */
#define IMP_STATE_HIST_LEN 16
struct import_state_hist {
	enum lustre_imp_state ish_state;
	time64_t	ish_time;
};

/**
 * Definition of PortalRPC import structure.
 * Imports are representing client-side view to remote target.
 */
struct obd_import {
	/** Local handle (== id) for this import. */
	struct portals_handle     imp_handle;
	/** Reference counter */
	atomic_t	      imp_refcount;
	struct lustre_handle      imp_dlm_handle; /* client's ldlm export */
	/** Currently active connection */
	struct ptlrpc_connection *imp_connection;
	/** PortalRPC client structure for this import */
	struct ptlrpc_client     *imp_client;
	/** List element for linking into pinger chain */
	struct list_head		imp_pinger_chain;
	/** List element for linking into chain for destruction */
	struct list_head		imp_zombie_chain;

	/**
	 * Lists of requests that are retained for replay, waiting for a reply,
	 * or waiting for recovery to complete, respectively.
	 * @{
	 */
	struct list_head		imp_replay_list;
	struct list_head		imp_sending_list;
	struct list_head		imp_delayed_list;
	/** @} */

	/**
	 * List of requests that are retained for committed open replay. Once
	 * open is committed, open replay request will be moved from the
	 * imp_replay_list into the imp_committed_list.
	 * The imp_replay_cursor is for accelerating searching during replay.
	 * @{
	 */
	struct list_head		imp_committed_list;
	struct list_head	       *imp_replay_cursor;
	/** @} */

	/** obd device for this import */
	struct obd_device	*imp_obd;

	/**
	 * some seciruty-related fields
	 * @{
	 */
	struct ptlrpc_sec	*imp_sec;
	struct mutex		  imp_sec_mutex;
	time64_t		imp_sec_expire;
	/** @} */

	/** Wait queue for those who need to wait for recovery completion */
	wait_queue_head_t	       imp_recovery_waitq;

	/** Number of requests currently in-flight */
	atomic_t	      imp_inflight;
	/** Number of requests currently unregistering */
	atomic_t	      imp_unregistering;
	/** Number of replay requests inflight */
	atomic_t	      imp_replay_inflight;
	/** Number of currently happening import invalidations */
	atomic_t	      imp_inval_count;
	/** Numbner of request timeouts */
	atomic_t	      imp_timeouts;
	/** Current import state */
	enum lustre_imp_state     imp_state;
	/** Last replay state */
	enum lustre_imp_state	  imp_replay_state;
	/** History of import states */
	struct import_state_hist  imp_state_hist[IMP_STATE_HIST_LEN];
	int		       imp_state_hist_idx;
	/** Current import generation. Incremented on every reconnect */
	int		       imp_generation;
	/** Incremented every time we send reconnection request */
	__u32		     imp_conn_cnt;
       /**
	* \see ptlrpc_free_committed remembers imp_generation value here
	* after a check to save on unnecessary replay list iterations
	*/
	int		       imp_last_generation_checked;
	/** Last transno we replayed */
	__u64		     imp_last_replay_transno;
	/** Last transno committed on remote side */
	__u64		     imp_peer_committed_transno;
	/**
	 * \see ptlrpc_free_committed remembers last_transno since its last
	 * check here and if last_transno did not change since last run of
	 * ptlrpc_free_committed and import generation is the same, we can
	 * skip looking for requests to remove from replay list as optimisation
	 */
	__u64		     imp_last_transno_checked;
	/**
	 * Remote export handle. This is how remote side knows what export
	 * we are talking to. Filled from response to connect request
	 */
	struct lustre_handle      imp_remote_handle;
	/** When to perform next ping. time in jiffies. */
	unsigned long		imp_next_ping;
	/** When we last successfully connected. time in 64bit jiffies */
	__u64		     imp_last_success_conn;

	/** List of all possible connection for import. */
	struct list_head		imp_conn_list;
	/**
	 * Current connection. \a imp_connection is imp_conn_current->oic_conn
	 */
	struct obd_import_conn   *imp_conn_current;

	/** Protects flags, level, generation, conn_cnt, *_list */
	spinlock_t		  imp_lock;

	/* flags */
	unsigned long	     imp_no_timeout:1, /* timeouts are disabled */
				  imp_invalid:1,    /* evicted */
				  /* administratively disabled */
				  imp_deactive:1,
				  /* try to recover the import */
				  imp_replayable:1,
				  /* don't run recovery (timeout instead) */
				  imp_dlm_fake:1,
				  /* use 1/2 timeout on MDS' OSCs */
				  imp_server_timeout:1,
				  /* VBR: imp in delayed recovery */
				  imp_delayed_recovery:1,
				  /* VBR: if gap was found then no lock replays
				   */
				  imp_no_lock_replay:1,
				  /* recovery by versions was failed */
				  imp_vbr_failed:1,
				  /* force an immediate ping */
				  imp_force_verify:1,
				  /* force a scheduled ping */
				  imp_force_next_verify:1,
				  /* pingable */
				  imp_pingable:1,
				  /* resend for replay */
				  imp_resend_replay:1,
				  /* disable normal recovery, for test only. */
				  imp_no_pinger_recover:1,
				  /* need IR MNE swab */
				  imp_need_mne_swab:1,
				  /* import must be reconnected instead of
				   * chosing new connection
				   */
				  imp_force_reconnect:1,
				  /* import has tried to connect with server */
				  imp_connect_tried:1;
	__u32		     imp_connect_op;
	struct obd_connect_data   imp_connect_data;
	__u64		     imp_connect_flags_orig;
	int		       imp_connect_error;

	__u32		     imp_msg_magic;
	__u32		     imp_msghdr_flags;       /* adjusted based on server capability */

	struct imp_at	     imp_at;		 /* adaptive timeout data */
	time64_t	     imp_last_reply_time;    /* for health check */
};

/* import.c */
static inline unsigned int at_est2timeout(unsigned int val)
{
	/* add an arbitrary minimum: 125% +5 sec */
	return (val + (val >> 2) + 5);
}

static inline unsigned int at_timeout2est(unsigned int val)
{
	/* restore estimate value from timeout: e=4/5(t-5) */
	LASSERT(val);
	return (max((val << 2) / 5, 5U) - 4);
}

static inline void at_reset(struct adaptive_timeout *at, int val)
{
	spin_lock(&at->at_lock);
	at->at_current = val;
	at->at_worst_ever = val;
	at->at_worst_time = ktime_get_real_seconds();
	spin_unlock(&at->at_lock);
}

static inline void at_init(struct adaptive_timeout *at, int val, int flags)
{
	memset(at, 0, sizeof(*at));
	spin_lock_init(&at->at_lock);
	at->at_flags = flags;
	at_reset(at, val);
}

extern unsigned int at_min;
static inline int at_get(struct adaptive_timeout *at)
{
	return (at->at_current > at_min) ? at->at_current : at_min;
}

int at_measured(struct adaptive_timeout *at, unsigned int val);
int import_at_get_index(struct obd_import *imp, int portal);
extern unsigned int at_max;
#define AT_OFF (at_max == 0)

/* genops.c */
struct obd_export;
struct obd_import *class_exp2cliimp(struct obd_export *);

/** @} import */

#endif /* __IMPORT_H */

/** @} obd_import */
Commit	Line	Data
d7e09d03 PT	1	/*
	2	* GPL HEADER START
	3	*
	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 only,
	8	* as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	* General Public License version 2 for more details (a copy is included
	14	* in the LICENSE file that accompanied this code).
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* version 2 along with this program; If not, see
6a5b99a4	18	* http://www.gnu.org/licenses/gpl-2.0.html
d7e09d03	19	*
d7e09d03 PT	20	* GPL HEADER END
	21	*/
	22	/*
	23	* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
	24	* Use is subject to license terms.
	25	*
	26	* Copyright (c) 2011, 2012, Intel Corporation.
	27	*/
	28	/*
	29	* This file is part of Lustre, http://www.lustre.org/
	30	* Lustre is a trademark of Sun Microsystems, Inc.
	31	*/
	32	/** \defgroup obd_import PtlRPC import definitions
	33	* Imports are client-side representation of remote obd target.
	34	*
	35	* @{
	36	*/
	37
	38	#ifndef __IMPORT_H
	39	#define __IMPORT_H
	40
	41	/** \defgroup export export
	42	*
	43	* @{
	44	*/
	45
1accaadf GKH	46	#include "lustre_handles.h"
1accaadf GKH	47	#include "lustre/lustre_idl.h"
d7e09d03	48
d7e09d03 PT	49	/**
	50	* Adaptive Timeout stuff
	51	*
	52	* @{
	53	*/
	54	#define D_ADAPTTO D_OTHER
	55	#define AT_BINS 4 /* "bin" means "N seconds of history" */
	56	#define AT_FLG_NOHIST 0x1 /* use last reported value only */
	57
	58	struct adaptive_timeout {
0ac0478b	59	time64_t at_binstart; /* bin start time */
d7e09d03 PT	60	unsigned int at_hist[AT_BINS]; /* timeout history bins */
	61	unsigned int at_flags;
	62	unsigned int at_current; /* current timeout value */
	63	unsigned int at_worst_ever; /* worst-ever timeout value */
0ac0478b	64	time64_t at_worst_time; /* worst-ever timeout timestamp */
d7e09d03 PT	65	spinlock_t at_lock;
	66	};
	67
	68	struct ptlrpc_at_array {
	69	struct list_head paa_reqs_array; /* array to hold requests */
	70	__u32 paa_size; /** the size of array */
	71	__u32 paa_count; /** the total count of reqs */
219e6de6	72	time64_t paa_deadline; /** the earliest deadline of reqs */
d7e09d03 PT	73	__u32 paa_reqs_count; /* the count of reqs in each entry */
	74	};
	75
	76	#define IMP_AT_MAX_PORTALS 8
	77	struct imp_at {
	78	int iat_portal[IMP_AT_MAX_PORTALS];
	79	struct adaptive_timeout iat_net_latency;
	80	struct adaptive_timeout iat_service_estimate[IMP_AT_MAX_PORTALS];
	81	};
	82
d7e09d03 PT	83	/** @} */
	84
	85	/** Possible import states */
	86	enum lustre_imp_state {
	87	LUSTRE_IMP_CLOSED = 1,
	88	LUSTRE_IMP_NEW = 2,
	89	LUSTRE_IMP_DISCON = 3,
	90	LUSTRE_IMP_CONNECTING = 4,
	91	LUSTRE_IMP_REPLAY = 5,
	92	LUSTRE_IMP_REPLAY_LOCKS = 6,
	93	LUSTRE_IMP_REPLAY_WAIT = 7,
	94	LUSTRE_IMP_RECOVER = 8,
	95	LUSTRE_IMP_FULL = 9,
	96	LUSTRE_IMP_EVICTED = 10,
	97	};
	98
	99	/** Returns test string representation of numeric import state \a state */
727543d6	100	static inline char *ptlrpc_import_state_name(enum lustre_imp_state state)
d7e09d03	101	{
727543d6	102	static char *import_state_names[] = {
d7e09d03 PT	103	"<UNKNOWN>", "CLOSED", "NEW", "DISCONN",
	104	"CONNECTING", "REPLAY", "REPLAY_LOCKS", "REPLAY_WAIT",
	105	"RECOVER", "FULL", "EVICTED",
	106	};
	107
e9570b49	108	LASSERT(state <= LUSTRE_IMP_EVICTED);
d7e09d03 PT	109	return import_state_names[state];
	110	}
	111
	112	/**
	113	* List of import event types
	114	*/
	115	enum obd_import_event {
	116	IMP_EVENT_DISCON = 0x808001,
	117	IMP_EVENT_INACTIVE = 0x808002,
	118	IMP_EVENT_INVALIDATE = 0x808003,
	119	IMP_EVENT_ACTIVE = 0x808004,
	120	IMP_EVENT_OCD = 0x808005,
	121	IMP_EVENT_DEACTIVATE = 0x808006,
	122	IMP_EVENT_ACTIVATE = 0x808007,
	123	};
	124
	125	/**
	126	* Definition of import connection structure
	127	*/
	128	struct obd_import_conn {
	129	/** Item for linking connections together */
	130	struct list_head oic_item;
	131	/** Pointer to actual PortalRPC connection */
	132	struct ptlrpc_connection *oic_conn;
	133	/** uuid of remote side */
	134	struct obd_uuid oic_uuid;
	135	/**
	136	* Time (64 bit jiffies) of last connection attempt on this connection
	137	*/
	138	__u64 oic_last_attempt;
	139	};
	140
	141	/* state history */
	142	#define IMP_STATE_HIST_LEN 16
	143	struct import_state_hist {
	144	enum lustre_imp_state ish_state;
74e489aa	145	time64_t ish_time;
d7e09d03 PT	146	};
	147
	148	/**
bd9070cb	149	* Definition of PortalRPC import structure.
d7e09d03 PT	150	* Imports are representing client-side view to remote target.
	151	*/
	152	struct obd_import {
	153	/** Local handle (== id) for this import. */
	154	struct portals_handle imp_handle;
	155	/** Reference counter */
	156	atomic_t imp_refcount;
	157	struct lustre_handle imp_dlm_handle; /* client's ldlm export */
	158	/** Currently active connection */
	159	struct ptlrpc_connection *imp_connection;
	160	/** PortalRPC client structure for this import */
	161	struct ptlrpc_client *imp_client;
	162	/** List element for linking into pinger chain */
	163	struct list_head imp_pinger_chain;
	164	/** List element for linking into chain for destruction */
	165	struct list_head imp_zombie_chain;
	166
	167	/**
	168	* Lists of requests that are retained for replay, waiting for a reply,
	169	* or waiting for recovery to complete, respectively.
	170	* @{
	171	*/
	172	struct list_head imp_replay_list;
	173	struct list_head imp_sending_list;
	174	struct list_head imp_delayed_list;
	175	/** @} */
	176
63d42578 HZ	177	/**
	178	* List of requests that are retained for committed open replay. Once
	179	* open is committed, open replay request will be moved from the
	180	* imp_replay_list into the imp_committed_list.
	181	* The imp_replay_cursor is for accelerating searching during replay.
	182	* @{
	183	*/
	184	struct list_head imp_committed_list;
	185	struct list_head *imp_replay_cursor;
	186	/** @} */
	187
d7e09d03 PT	188	/** obd device for this import */
	189	struct obd_device *imp_obd;
	190
	191	/**
	192	* some seciruty-related fields
	193	* @{
	194	*/
	195	struct ptlrpc_sec *imp_sec;
	196	struct mutex imp_sec_mutex;
986ef135	197	time64_t imp_sec_expire;
d7e09d03 PT	198	/** @} */
	199
	200	/** Wait queue for those who need to wait for recovery completion */
	201	wait_queue_head_t imp_recovery_waitq;
	202
	203	/** Number of requests currently in-flight */
	204	atomic_t imp_inflight;
	205	/** Number of requests currently unregistering */
	206	atomic_t imp_unregistering;
	207	/** Number of replay requests inflight */
	208	atomic_t imp_replay_inflight;
	209	/** Number of currently happening import invalidations */
	210	atomic_t imp_inval_count;
	211	/** Numbner of request timeouts */
	212	atomic_t imp_timeouts;
	213	/** Current import state */
	214	enum lustre_imp_state imp_state;
502cb58e AS	215	/** Last replay state */
502cb58e AS	216	enum lustre_imp_state imp_replay_state;
d7e09d03 PT	217	/** History of import states */
	218	struct import_state_hist imp_state_hist[IMP_STATE_HIST_LEN];
	219	int imp_state_hist_idx;
	220	/** Current import generation. Incremented on every reconnect */
	221	int imp_generation;
	222	/** Incremented every time we send reconnection request */
	223	__u32 imp_conn_cnt;
	224	/**
	225	* \see ptlrpc_free_committed remembers imp_generation value here
	226	* after a check to save on unnecessary replay list iterations
	227	*/
	228	int imp_last_generation_checked;
bd9070cb	229	/** Last transno we replayed */
d7e09d03 PT	230	__u64 imp_last_replay_transno;
	231	/** Last transno committed on remote side */
	232	__u64 imp_peer_committed_transno;
	233	/**
	234	* \see ptlrpc_free_committed remembers last_transno since its last
	235	* check here and if last_transno did not change since last run of
	236	* ptlrpc_free_committed and import generation is the same, we can
	237	* skip looking for requests to remove from replay list as optimisation
	238	*/
	239	__u64 imp_last_transno_checked;
	240	/**
	241	* Remote export handle. This is how remote side knows what export
	242	* we are talking to. Filled from response to connect request
	243	*/
	244	struct lustre_handle imp_remote_handle;
	245	/** When to perform next ping. time in jiffies. */
a649ad1d	246	unsigned long imp_next_ping;
bd9070cb	247	/** When we last successfully connected. time in 64bit jiffies */
d7e09d03 PT	248	__u64 imp_last_success_conn;
	249
	250	/** List of all possible connection for import. */
	251	struct list_head imp_conn_list;
	252	/**
	253	* Current connection. \a imp_connection is imp_conn_current->oic_conn
	254	*/
	255	struct obd_import_conn *imp_conn_current;
	256
	257	/** Protects flags, level, generation, conn_cnt, _list /
	258	spinlock_t imp_lock;
	259
	260	/* flags */
	261	unsigned long imp_no_timeout:1, /* timeouts are disabled */
	262	imp_invalid:1, /* evicted */
	263	/* administratively disabled */
	264	imp_deactive:1,
	265	/* try to recover the import */
	266	imp_replayable:1,
	267	/* don't run recovery (timeout instead) */
	268	imp_dlm_fake:1,
	269	/* use 1/2 timeout on MDS' OSCs */
	270	imp_server_timeout:1,
	271	/* VBR: imp in delayed recovery */
	272	imp_delayed_recovery:1,
	273	/* VBR: if gap was found then no lock replays
	274	*/
	275	imp_no_lock_replay:1,
	276	/* recovery by versions was failed */
	277	imp_vbr_failed:1,
bd9070cb	278	/* force an immediate ping */
d7e09d03 PT	279	imp_force_verify:1,
	280	/* force a scheduled ping */
	281	imp_force_next_verify:1,
	282	/* pingable */
	283	imp_pingable:1,
	284	/* resend for replay */
	285	imp_resend_replay:1,
	286	/* disable normal recovery, for test only. */
	287	imp_no_pinger_recover:1,
	288	/* need IR MNE swab */
	289	imp_need_mne_swab:1,
	290	/* import must be reconnected instead of
c56e256d OD	291	* chosing new connection
c56e256d OD	292	*/
d7e09d03 PT	293	imp_force_reconnect:1,
	294	/* import has tried to connect with server */
	295	imp_connect_tried:1;
	296	__u32 imp_connect_op;
	297	struct obd_connect_data imp_connect_data;
	298	__u64 imp_connect_flags_orig;
	299	int imp_connect_error;
	300
	301	__u32 imp_msg_magic;
	302	__u32 imp_msghdr_flags; /* adjusted based on server capability */
	303
d7e09d03	304	struct imp_at imp_at; /* adaptive timeout data */
74e489aa	305	time64_t imp_last_reply_time; /* for health check */
d7e09d03 PT	306	};
d7e09d03 PT	307
d7e09d03 PT	308	/* import.c */
	309	static inline unsigned int at_est2timeout(unsigned int val)
	310	{
	311	/* add an arbitrary minimum: 125% +5 sec */
	312	return (val + (val >> 2) + 5);
	313	}
	314
	315	static inline unsigned int at_timeout2est(unsigned int val)
	316	{
	317	/* restore estimate value from timeout: e=4/5(t-5) */
	318	LASSERT(val);
	319	return (max((val << 2) / 5, 5U) - 4);
	320	}
	321
db7b4b39 SB	322	static inline void at_reset(struct adaptive_timeout *at, int val)
db7b4b39 SB	323	{
f84d3d47	324	spin_lock(&at->at_lock);
d7e09d03 PT	325	at->at_current = val;
d7e09d03 PT	326	at->at_worst_ever = val;
0ac0478b	327	at->at_worst_time = ktime_get_real_seconds();
f84d3d47	328	spin_unlock(&at->at_lock);
d7e09d03	329	}
c9f6bb96	330
db7b4b39 SB	331	static inline void at_init(struct adaptive_timeout *at, int val, int flags)
db7b4b39 SB	332	{
d7e09d03 PT	333	memset(at, 0, sizeof(*at));
	334	spin_lock_init(&at->at_lock);
	335	at->at_flags = flags;
	336	at_reset(at, val);
	337	}
c9f6bb96	338
d7e09d03	339	extern unsigned int at_min;
db7b4b39 SB	340	static inline int at_get(struct adaptive_timeout *at)
db7b4b39 SB	341	{
d7e09d03 PT	342	return (at->at_current > at_min) ? at->at_current : at_min;
d7e09d03 PT	343	}
c9f6bb96	344
d7e09d03 PT	345	int at_measured(struct adaptive_timeout *at, unsigned int val);
	346	int import_at_get_index(struct obd_import *imp, int portal);
	347	extern unsigned int at_max;
	348	#define AT_OFF (at_max == 0)
	349
	350	/* genops.c */
	351	struct obd_export;
8150a97f	352	struct obd_import class_exp2cliimp(struct obd_export );
d7e09d03 PT	353
	354	/** @} import */
	355
	356	#endif /* __IMPORT_H */
	357
	358	/** @} obd_import */