[deliverable/linux.git] / fs / nfs / pnfs.h

/*
 *  pNFS client data structures.
 *
 *  Copyright (c) 2002
 *  The Regents of the University of Michigan
 *  All Rights Reserved
 *
 *  Dean Hildebrand <dhildebz@umich.edu>
 *
 *  Permission is granted to use, copy, create derivative works, and
 *  redistribute this software and such derivative works for any purpose,
 *  so long as the name of the University of Michigan is not used in
 *  any advertising or publicity pertaining to the use or distribution
 *  of this software without specific, written prior authorization. If
 *  the above copyright notice or any other identification of the
 *  University of Michigan is included in any copy of any portion of
 *  this software, then the disclaimer below must also be included.
 *
 *  This software is provided as is, without representation or warranty
 *  of any kind either express or implied, including without limitation
 *  the implied warranties of merchantability, fitness for a particular
 *  purpose, or noninfringement.  The Regents of the University of
 *  Michigan shall not be liable for any damages, including special,
 *  indirect, incidental, or consequential damages, with respect to any
 *  claim arising out of or in connection with the use of the software,
 *  even if it has been or is hereafter advised of the possibility of
 *  such damages.
 */

#ifndef FS_NFS_PNFS_H
#define FS_NFS_PNFS_H

#include <linux/nfs_page.h>

enum {
	NFS_LSEG_VALID = 0,	/* cleared when lseg is recalled/returned */
	NFS_LSEG_ROC,		/* roc bit received from server */
};

struct pnfs_layout_segment {
	struct list_head pls_list;
	struct pnfs_layout_range pls_range;
	atomic_t pls_refcount;
	unsigned long pls_flags;
	struct pnfs_layout_hdr *pls_layout;
};

enum pnfs_try_status {
	PNFS_ATTEMPTED     = 0,
	PNFS_NOT_ATTEMPTED = 1,
};

#ifdef CONFIG_NFS_V4_1

#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"

enum {
	NFS_LAYOUT_RO_FAILED = 0,	/* get ro layout failed stop trying */
	NFS_LAYOUT_RW_FAILED,		/* get rw layout failed stop trying */
	NFS_LAYOUT_BULK_RECALL,		/* bulk recall affecting layout */
	NFS_LAYOUT_ROC,			/* some lseg had roc bit set */
	NFS_LAYOUT_DESTROYED,		/* no new use of layout allowed */
};

/* Per-layout driver specific registration structure */
struct pnfs_layoutdriver_type {
	struct list_head pnfs_tblid;
	const u32 id;
	const char *name;
	struct module *owner;
	struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
	void (*free_lseg) (struct pnfs_layout_segment *lseg);

	/* test for nfs page cache coalescing */
	int (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);

	/* Returns true if layoutdriver wants to divert this request to
	 * driver's commit routine.
	 */
	bool (*mark_pnfs_commit)(struct pnfs_layout_segment *lseg);
	struct list_head * (*choose_commit_list) (struct nfs_page *req);
	int (*commit_pagelist)(struct inode *inode, struct list_head *mds_pages, int how);

	/*
	 * Return PNFS_ATTEMPTED to indicate the layout code has attempted
	 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
	 */
	enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
	enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
};

struct pnfs_layout_hdr {
	atomic_t		plh_refcount;
	struct list_head	plh_layouts;   /* other client layouts */
	struct list_head	plh_bulk_recall; /* clnt list of bulk recalls */
	struct list_head	plh_segs;      /* layout segments list */
	nfs4_stateid		plh_stateid;
	atomic_t		plh_outstanding; /* number of RPCs out */
	unsigned long		plh_block_lgets; /* block LAYOUTGET if >0 */
	u32			plh_barrier; /* ignore lower seqids */
	unsigned long		plh_flags;
	struct inode		*plh_inode;
};

struct pnfs_device {
	struct nfs4_deviceid dev_id;
	unsigned int  layout_type;
	unsigned int  mincount;
	struct page **pages;
	void          *area;
	unsigned int  pgbase;
	unsigned int  pglen;
};

extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);

/* nfs4proc.c */
extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
				   struct pnfs_device *dev);
extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);

/* pnfs.c */
void get_layout_hdr(struct pnfs_layout_hdr *lo);
void put_lseg(struct pnfs_layout_segment *lseg);
struct pnfs_layout_segment *
pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
		   enum pnfs_iomode access_type);
void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
void unset_pnfs_layoutdriver(struct nfs_server *);
enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
					     const struct rpc_call_ops *, int);
enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
					    const struct rpc_call_ops *);
void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *);
int pnfs_layout_process(struct nfs4_layoutget *lgp);
void pnfs_free_lseg_list(struct list_head *tmp_list);
void pnfs_destroy_layout(struct nfs_inode *);
void pnfs_destroy_all_layouts(struct nfs_client *);
void put_layout_hdr(struct pnfs_layout_hdr *lo);
void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
			     const nfs4_stateid *new,
			     bool update_barrier);
int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
				  struct pnfs_layout_hdr *lo,
				  struct nfs4_state *open_state);
int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
				struct list_head *tmp_list,
				u32 iomode);
bool pnfs_roc(struct inode *ino);
void pnfs_roc_release(struct inode *ino);
void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
bool pnfs_roc_drain(struct inode *ino, u32 *barrier);


static inline int lo_fail_bit(u32 iomode)
{
	return iomode == IOMODE_RW ?
			 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
}

static inline struct pnfs_layout_segment *
get_lseg(struct pnfs_layout_segment *lseg)
{
	if (lseg) {
		atomic_inc(&lseg->pls_refcount);
		smp_mb__after_atomic_inc();
	}
	return lseg;
}

/* Return true if a layout driver is being used for this mountpoint */
static inline int pnfs_enabled_sb(struct nfs_server *nfss)
{
	return nfss->pnfs_curr_ld != NULL;
}

static inline void
pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
{
	if (lseg) {
		struct pnfs_layoutdriver_type *ld;

		ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
		if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
			set_bit(PG_PNFS_COMMIT, &req->wb_flags);
			req->wb_commit_lseg = get_lseg(lseg);
		}
	}
}

static inline int
pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
{
	if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
		return PNFS_NOT_ATTEMPTED;
	return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
}

static inline struct list_head *
pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
{
	struct list_head *rv;

	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
		struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;

		set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
		rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
		/* matched by ref taken when PG_PNFS_COMMIT is set */
		put_lseg(req->wb_commit_lseg);
	} else
		rv = mds;
	return rv;
}

static inline void pnfs_clear_request_commit(struct nfs_page *req)
{
	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
		put_lseg(req->wb_commit_lseg);
}

#else  /* CONFIG_NFS_V4_1 */

static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
{
}

static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
{
}

static inline struct pnfs_layout_segment *
get_lseg(struct pnfs_layout_segment *lseg)
{
	return NULL;
}

static inline void put_lseg(struct pnfs_layout_segment *lseg)
{
}

static inline struct pnfs_layout_segment *
pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
		   enum pnfs_iomode access_type)
{
	return NULL;
}

static inline enum pnfs_try_status
pnfs_try_to_read_data(struct nfs_read_data *data,
		      const struct rpc_call_ops *call_ops)
{
	return PNFS_NOT_ATTEMPTED;
}

static inline enum pnfs_try_status
pnfs_try_to_write_data(struct nfs_write_data *data,
		       const struct rpc_call_ops *call_ops, int how)
{
	return PNFS_NOT_ATTEMPTED;
}

static inline bool
pnfs_roc(struct inode *ino)
{
	return false;
}

static inline void
pnfs_roc_release(struct inode *ino)
{
}

static inline void
pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
{
}

static inline bool
pnfs_roc_drain(struct inode *ino, u32 *barrier)
{
	return false;
}

static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
{
}

static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
{
}

static inline void
pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *ino)
{
	pgio->pg_test = NULL;
}

static inline void
pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *ino)
{
	pgio->pg_test = NULL;
}

static inline void
pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
{
}

static inline int
pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how)
{
	return PNFS_NOT_ATTEMPTED;
}

static inline struct list_head *
pnfs_choose_commit_list(struct nfs_page *req, struct list_head *mds)
{
	return mds;
}

static inline void pnfs_clear_request_commit(struct nfs_page *req)
{
}

#endif /* CONFIG_NFS_V4_1 */

#endif /* FS_NFS_PNFS_H */
Commit	Line	Data
85e174ba RL	1	/*
	2	* pNFS client data structures.
	3	*
	4	* Copyright (c) 2002
	5	* The Regents of the University of Michigan
	6	* All Rights Reserved
	7	*
	8	* Dean Hildebrand <dhildebz@umich.edu>
	9	*
	10	* Permission is granted to use, copy, create derivative works, and
	11	* redistribute this software and such derivative works for any purpose,
	12	* so long as the name of the University of Michigan is not used in
	13	* any advertising or publicity pertaining to the use or distribution
	14	* of this software without specific, written prior authorization. If
	15	* the above copyright notice or any other identification of the
	16	* University of Michigan is included in any copy of any portion of
	17	* this software, then the disclaimer below must also be included.
	18	*
	19	* This software is provided as is, without representation or warranty
	20	* of any kind either express or implied, including without limitation
	21	* the implied warranties of merchantability, fitness for a particular
	22	* purpose, or noninfringement. The Regents of the University of
	23	* Michigan shall not be liable for any damages, including special,
	24	* indirect, incidental, or consequential damages, with respect to any
	25	* claim arising out of or in connection with the use of the software,
	26	* even if it has been or is hereafter advised of the possibility of
	27	* such damages.
	28	*/
	29
	30	#ifndef FS_NFS_PNFS_H
	31	#define FS_NFS_PNFS_H
	32
94ad1c80 FI	33	#include <linux/nfs_page.h>
94ad1c80 FI	34
4541d16c FI	35	enum {
4541d16c FI	36	NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
f7e8917a	37	NFS_LSEG_ROC, /* roc bit received from server */
4541d16c FI	38	};
4541d16c FI	39
974cec8c	40	struct pnfs_layout_segment {
566052c5 FI	41	struct list_head pls_list;
566052c5 FI	42	struct pnfs_layout_range pls_range;
4541d16c FI	43	atomic_t pls_refcount;
4541d16c FI	44	unsigned long pls_flags;
566052c5	45	struct pnfs_layout_hdr *pls_layout;
974cec8c AA	46	};
974cec8c AA	47
64419a9b AA	48	enum pnfs_try_status {
	49	PNFS_ATTEMPTED = 0,
	50	PNFS_NOT_ATTEMPTED = 1,
	51	};
	52
85e174ba RL	53	#ifdef CONFIG_NFS_V4_1
	54
	55	#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
	56
e5e94017 BH	57	enum {
	58	NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
	59	NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
43f1b3da	60	NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
f7e8917a	61	NFS_LAYOUT_ROC, /* some lseg had roc bit set */
4541d16c	62	NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
e5e94017 BH	63	};
e5e94017 BH	64
85e174ba RL	65	/* Per-layout driver specific registration structure */
85e174ba RL	66	struct pnfs_layoutdriver_type {
02c35fca FI	67	struct list_head pnfs_tblid;
	68	const u32 id;
	69	const char *name;
	70	struct module *owner;
b1f69b75 AA	71	struct pnfs_layout_segment * (alloc_lseg) (struct pnfs_layout_hdr layoutid, struct nfs4_layoutget_res *lgr);
b1f69b75 AA	72	void (free_lseg) (struct pnfs_layout_segment lseg);
94ad1c80 FI	73
	74	/* test for nfs page cache coalescing */
	75	int (pg_test)(struct nfs_pageio_descriptor , struct nfs_page , struct nfs_page );
64419a9b	76
a861a1e1 FI	77	/* Returns true if layoutdriver wants to divert this request to
	78	* driver's commit routine.
	79	*/
	80	bool (mark_pnfs_commit)(struct pnfs_layout_segment lseg);
	81	struct list_head * (choose_commit_list) (struct nfs_page req);
	82	int (commit_pagelist)(struct inode inode, struct list_head *mds_pages, int how);
	83
64419a9b AA	84	/*
	85	* Return PNFS_ATTEMPTED to indicate the layout code has attempted
	86	* I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
	87	*/
	88	enum pnfs_try_status (read_pagelist) (struct nfs_read_data nfs_data);
0382b744	89	enum pnfs_try_status (write_pagelist) (struct nfs_write_data nfs_data, int how);
85e174ba RL	90	};
85e174ba RL	91
e5e94017	92	struct pnfs_layout_hdr {
cc6e5340	93	atomic_t plh_refcount;
b7edfaa1	94	struct list_head plh_layouts; /* other client layouts */
43f1b3da	95	struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
b7edfaa1	96	struct list_head plh_segs; /* layout segments list */
b7edfaa1	97	nfs4_stateid plh_stateid;
cf7d63f1	98	atomic_t plh_outstanding; /* number of RPCs out */
f7e8917a	99	unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
43f1b3da	100	u32 plh_barrier; /* ignore lower seqids */
566052c5	101	unsigned long plh_flags;
b7edfaa1	102	struct inode *plh_inode;
e5e94017 BH	103	};
e5e94017 BH	104
b1f69b75 AA	105	struct pnfs_device {
	106	struct nfs4_deviceid dev_id;
	107	unsigned int layout_type;
	108	unsigned int mincount;
	109	struct page **pages;
	110	void *area;
	111	unsigned int pgbase;
	112	unsigned int pglen;
	113	};
	114
02c35fca FI	115	extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
	116	extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
	117
b1f69b75 AA	118	/* nfs4proc.c */
	119	extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
	120	struct pnfs_device *dev);
	121	extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
	122
	123	/* pnfs.c */
43f1b3da	124	void get_layout_hdr(struct pnfs_layout_hdr *lo);
bae724ef	125	void put_lseg(struct pnfs_layout_segment *lseg);
e5e94017 BH	126	struct pnfs_layout_segment *
	127	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
	128	enum pnfs_iomode access_type);
85e174ba RL	129	void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
85e174ba RL	130	void unset_pnfs_layoutdriver(struct nfs_server *);
0382b744 AA	131	enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
0382b744 AA	132	const struct rpc_call_ops *, int);
64419a9b AA	133	enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
64419a9b AA	134	const struct rpc_call_ops *);
94ad1c80	135	void pnfs_pageio_init_read(struct nfs_pageio_descriptor , struct inode );
44b83799	136	void pnfs_pageio_init_write(struct nfs_pageio_descriptor , struct inode );
b1f69b75	137	int pnfs_layout_process(struct nfs4_layoutget *lgp);
43f1b3da	138	void pnfs_free_lseg_list(struct list_head *tmp_list);
e5e94017	139	void pnfs_destroy_layout(struct nfs_inode *);
974cec8c	140	void pnfs_destroy_all_layouts(struct nfs_client *);
cc6e5340	141	void put_layout_hdr(struct pnfs_layout_hdr *lo);
43f1b3da FI	142	void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
	143	const nfs4_stateid *new,
	144	bool update_barrier);
fd6002e9 FI	145	int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
	146	struct pnfs_layout_hdr *lo,
	147	struct nfs4_state *open_state);
43f1b3da FI	148	int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
	149	struct list_head *tmp_list,
	150	u32 iomode);
f7e8917a FI	151	bool pnfs_roc(struct inode *ino);
	152	void pnfs_roc_release(struct inode *ino);
	153	void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
	154	bool pnfs_roc_drain(struct inode ino, u32 barrier);
e5e94017 BH	155
	156
	157	static inline int lo_fail_bit(u32 iomode)
	158	{
	159	return iomode == IOMODE_RW ?
	160	NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
	161	}
	162
d684d2ae FI	163	static inline struct pnfs_layout_segment *
	164	get_lseg(struct pnfs_layout_segment *lseg)
	165	{
	166	if (lseg) {
	167	atomic_inc(&lseg->pls_refcount);
	168	smp_mb__after_atomic_inc();
	169	}
	170	return lseg;
	171	}
	172
e5e94017 BH	173	/* Return true if a layout driver is being used for this mountpoint */
	174	static inline int pnfs_enabled_sb(struct nfs_server *nfss)
	175	{
	176	return nfss->pnfs_curr_ld != NULL;
	177	}
85e174ba	178
a861a1e1 FI	179	static inline void
	180	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	181	{
	182	if (lseg) {
	183	struct pnfs_layoutdriver_type *ld;
	184
	185	ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
	186	if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
	187	set_bit(PG_PNFS_COMMIT, &req->wb_flags);
	188	req->wb_commit_lseg = get_lseg(lseg);
	189	}
	190	}
	191	}
	192
	193	static inline int
	194	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	195	{
	196	if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
	197	return PNFS_NOT_ATTEMPTED;
	198	return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
	199	}
	200
	201	static inline struct list_head *
	202	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	203	{
	204	struct list_head *rv;
	205
	206	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
	207	struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
	208
	209	set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
	210	rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
	211	/* matched by ref taken when PG_PNFS_COMMIT is set */
	212	put_lseg(req->wb_commit_lseg);
	213	} else
	214	rv = mds;
	215	return rv;
	216	}
	217
	218	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	219	{
	220	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
	221	put_lseg(req->wb_commit_lseg);
	222	}
	223
85e174ba RL	224	#else /* CONFIG_NFS_V4_1 */
85e174ba RL	225
974cec8c AA	226	static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
	227	{
	228	}
	229
e5e94017 BH	230	static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
	231	{
	232	}
	233
d684d2ae FI	234	static inline struct pnfs_layout_segment *
	235	get_lseg(struct pnfs_layout_segment *lseg)
	236	{
	237	return NULL;
	238	}
	239
	240	static inline void put_lseg(struct pnfs_layout_segment *lseg)
	241	{
	242	}
	243
e5e94017 BH	244	static inline struct pnfs_layout_segment *
	245	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
	246	enum pnfs_iomode access_type)
	247	{
	248	return NULL;
	249	}
	250
64419a9b AA	251	static inline enum pnfs_try_status
	252	pnfs_try_to_read_data(struct nfs_read_data *data,
	253	const struct rpc_call_ops *call_ops)
	254	{
	255	return PNFS_NOT_ATTEMPTED;
	256	}
	257
0382b744 AA	258	static inline enum pnfs_try_status
	259	pnfs_try_to_write_data(struct nfs_write_data *data,
	260	const struct rpc_call_ops *call_ops, int how)
	261	{
	262	return PNFS_NOT_ATTEMPTED;
	263	}
	264
f7e8917a FI	265	static inline bool
	266	pnfs_roc(struct inode *ino)
	267	{
	268	return false;
	269	}
	270
	271	static inline void
	272	pnfs_roc_release(struct inode *ino)
	273	{
	274	}
	275
	276	static inline void
	277	pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
	278	{
	279	}
	280
	281	static inline bool
	282	pnfs_roc_drain(struct inode ino, u32 barrier)
	283	{
	284	return false;
	285	}
	286
85e174ba RL	287	static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
	288	{
	289	}
	290
	291	static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
	292	{
	293	}
	294
94ad1c80 FI	295	static inline void
	296	pnfs_pageio_init_read(struct nfs_pageio_descriptor pgio, struct inode ino)
	297	{
	298	pgio->pg_test = NULL;
	299	}
	300
44b83799 FI	301	static inline void
	302	pnfs_pageio_init_write(struct nfs_pageio_descriptor pgio, struct inode ino)
	303	{
	304	pgio->pg_test = NULL;
	305	}
	306
a861a1e1 FI	307	static inline void
	308	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	309	{
	310	}
	311
	312	static inline int
	313	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	314	{
	315	return PNFS_NOT_ATTEMPTED;
	316	}
	317
	318	static inline struct list_head *
	319	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	320	{
	321	return mds;
	322	}
	323
	324	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	325	{
	326	}
	327
85e174ba RL	328	#endif /* CONFIG_NFS_V4_1 */
	329
	330	#endif /* FS_NFS_PNFS_H */