[linux-2.6-block.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;
	struct rpc_cred	*pls_lc_cred; /* LAYOUTCOMMIT credential */
	loff_t pls_end_pos; /* LAYOUTCOMMIT write end */
};

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);
void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
int pnfs_layoutcommit_inode(struct inode *inode, bool sync);

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)
{
}

static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
{
	return 0;
}
#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;
863a3c6c AA	46	struct rpc_cred pls_lc_cred; / LAYOUTCOMMIT credential */
863a3c6c AA	47	loff_t pls_end_pos; /* LAYOUTCOMMIT write end */
974cec8c AA	48	};
974cec8c AA	49
64419a9b AA	50	enum pnfs_try_status {
	51	PNFS_ATTEMPTED = 0,
	52	PNFS_NOT_ATTEMPTED = 1,
	53	};
	54
85e174ba RL	55	#ifdef CONFIG_NFS_V4_1
	56
	57	#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
	58
e5e94017 BH	59	enum {
	60	NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
	61	NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
43f1b3da	62	NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
f7e8917a	63	NFS_LAYOUT_ROC, /* some lseg had roc bit set */
4541d16c	64	NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
e5e94017 BH	65	};
e5e94017 BH	66
85e174ba RL	67	/* Per-layout driver specific registration structure */
85e174ba RL	68	struct pnfs_layoutdriver_type {
02c35fca FI	69	struct list_head pnfs_tblid;
	70	const u32 id;
	71	const char *name;
	72	struct module *owner;
b1f69b75 AA	73	struct pnfs_layout_segment * (alloc_lseg) (struct pnfs_layout_hdr layoutid, struct nfs4_layoutget_res *lgr);
b1f69b75 AA	74	void (free_lseg) (struct pnfs_layout_segment lseg);
94ad1c80 FI	75
	76	/* test for nfs page cache coalescing */
	77	int (pg_test)(struct nfs_pageio_descriptor , struct nfs_page , struct nfs_page );
64419a9b	78
a861a1e1 FI	79	/* Returns true if layoutdriver wants to divert this request to
	80	* driver's commit routine.
	81	*/
	82	bool (mark_pnfs_commit)(struct pnfs_layout_segment lseg);
	83	struct list_head * (choose_commit_list) (struct nfs_page req);
	84	int (commit_pagelist)(struct inode inode, struct list_head *mds_pages, int how);
	85
64419a9b AA	86	/*
	87	* Return PNFS_ATTEMPTED to indicate the layout code has attempted
	88	* I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
	89	*/
	90	enum pnfs_try_status (read_pagelist) (struct nfs_read_data nfs_data);
0382b744	91	enum pnfs_try_status (write_pagelist) (struct nfs_write_data nfs_data, int how);
85e174ba RL	92	};
85e174ba RL	93
e5e94017	94	struct pnfs_layout_hdr {
cc6e5340	95	atomic_t plh_refcount;
b7edfaa1	96	struct list_head plh_layouts; /* other client layouts */
43f1b3da	97	struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
b7edfaa1	98	struct list_head plh_segs; /* layout segments list */
b7edfaa1	99	nfs4_stateid plh_stateid;
cf7d63f1	100	atomic_t plh_outstanding; /* number of RPCs out */
f7e8917a	101	unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
43f1b3da	102	u32 plh_barrier; /* ignore lower seqids */
566052c5	103	unsigned long plh_flags;
b7edfaa1	104	struct inode *plh_inode;
e5e94017 BH	105	};
e5e94017 BH	106
b1f69b75 AA	107	struct pnfs_device {
	108	struct nfs4_deviceid dev_id;
	109	unsigned int layout_type;
	110	unsigned int mincount;
	111	struct page **pages;
	112	void *area;
	113	unsigned int pgbase;
	114	unsigned int pglen;
	115	};
	116
02c35fca FI	117	extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
	118	extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
	119
b1f69b75 AA	120	/* nfs4proc.c */
	121	extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
	122	struct pnfs_device *dev);
	123	extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
	124
	125	/* pnfs.c */
43f1b3da	126	void get_layout_hdr(struct pnfs_layout_hdr *lo);
bae724ef	127	void put_lseg(struct pnfs_layout_segment *lseg);
e5e94017 BH	128	struct pnfs_layout_segment *
	129	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
	130	enum pnfs_iomode access_type);
85e174ba RL	131	void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
85e174ba RL	132	void unset_pnfs_layoutdriver(struct nfs_server *);
0382b744 AA	133	enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
0382b744 AA	134	const struct rpc_call_ops *, int);
64419a9b AA	135	enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
64419a9b AA	136	const struct rpc_call_ops *);
94ad1c80	137	void pnfs_pageio_init_read(struct nfs_pageio_descriptor , struct inode );
44b83799	138	void pnfs_pageio_init_write(struct nfs_pageio_descriptor , struct inode );
b1f69b75	139	int pnfs_layout_process(struct nfs4_layoutget *lgp);
43f1b3da	140	void pnfs_free_lseg_list(struct list_head *tmp_list);
e5e94017	141	void pnfs_destroy_layout(struct nfs_inode *);
974cec8c	142	void pnfs_destroy_all_layouts(struct nfs_client *);
cc6e5340	143	void put_layout_hdr(struct pnfs_layout_hdr *lo);
43f1b3da FI	144	void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
	145	const nfs4_stateid *new,
	146	bool update_barrier);
fd6002e9 FI	147	int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
	148	struct pnfs_layout_hdr *lo,
	149	struct nfs4_state *open_state);
43f1b3da FI	150	int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
	151	struct list_head *tmp_list,
	152	u32 iomode);
f7e8917a FI	153	bool pnfs_roc(struct inode *ino);
	154	void pnfs_roc_release(struct inode *ino);
	155	void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
	156	bool pnfs_roc_drain(struct inode ino, u32 barrier);
863a3c6c	157	void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
ef311537	158	int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
e5e94017 BH	159
	160	static inline int lo_fail_bit(u32 iomode)
	161	{
	162	return iomode == IOMODE_RW ?
	163	NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
	164	}
	165
d684d2ae FI	166	static inline struct pnfs_layout_segment *
	167	get_lseg(struct pnfs_layout_segment *lseg)
	168	{
	169	if (lseg) {
	170	atomic_inc(&lseg->pls_refcount);
	171	smp_mb__after_atomic_inc();
	172	}
	173	return lseg;
	174	}
	175
e5e94017 BH	176	/* Return true if a layout driver is being used for this mountpoint */
	177	static inline int pnfs_enabled_sb(struct nfs_server *nfss)
	178	{
	179	return nfss->pnfs_curr_ld != NULL;
	180	}
85e174ba	181
a861a1e1 FI	182	static inline void
	183	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	184	{
	185	if (lseg) {
	186	struct pnfs_layoutdriver_type *ld;
	187
	188	ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
	189	if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
	190	set_bit(PG_PNFS_COMMIT, &req->wb_flags);
	191	req->wb_commit_lseg = get_lseg(lseg);
	192	}
	193	}
	194	}
	195
	196	static inline int
	197	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	198	{
	199	if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
	200	return PNFS_NOT_ATTEMPTED;
	201	return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
	202	}
	203
	204	static inline struct list_head *
	205	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	206	{
	207	struct list_head *rv;
	208
	209	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
	210	struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
	211
	212	set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
	213	rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
	214	/* matched by ref taken when PG_PNFS_COMMIT is set */
	215	put_lseg(req->wb_commit_lseg);
	216	} else
	217	rv = mds;
	218	return rv;
	219	}
	220
	221	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	222	{
	223	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
	224	put_lseg(req->wb_commit_lseg);
	225	}
	226
85e174ba RL	227	#else /* CONFIG_NFS_V4_1 */
85e174ba RL	228
974cec8c AA	229	static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
	230	{
	231	}
	232
e5e94017 BH	233	static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
	234	{
	235	}
	236
d684d2ae FI	237	static inline struct pnfs_layout_segment *
	238	get_lseg(struct pnfs_layout_segment *lseg)
	239	{
	240	return NULL;
	241	}
	242
	243	static inline void put_lseg(struct pnfs_layout_segment *lseg)
	244	{
	245	}
	246
e5e94017 BH	247	static inline struct pnfs_layout_segment *
	248	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
	249	enum pnfs_iomode access_type)
	250	{
	251	return NULL;
	252	}
	253
64419a9b AA	254	static inline enum pnfs_try_status
	255	pnfs_try_to_read_data(struct nfs_read_data *data,
	256	const struct rpc_call_ops *call_ops)
	257	{
	258	return PNFS_NOT_ATTEMPTED;
	259	}
	260
0382b744 AA	261	static inline enum pnfs_try_status
	262	pnfs_try_to_write_data(struct nfs_write_data *data,
	263	const struct rpc_call_ops *call_ops, int how)
	264	{
	265	return PNFS_NOT_ATTEMPTED;
	266	}
	267
f7e8917a FI	268	static inline bool
	269	pnfs_roc(struct inode *ino)
	270	{
	271	return false;
	272	}
	273
	274	static inline void
	275	pnfs_roc_release(struct inode *ino)
	276	{
	277	}
	278
	279	static inline void
	280	pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
	281	{
	282	}
	283
	284	static inline bool
	285	pnfs_roc_drain(struct inode ino, u32 barrier)
	286	{
	287	return false;
	288	}
	289
85e174ba RL	290	static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
	291	{
	292	}
	293
	294	static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
	295	{
	296	}
	297
94ad1c80 FI	298	static inline void
	299	pnfs_pageio_init_read(struct nfs_pageio_descriptor pgio, struct inode ino)
	300	{
	301	pgio->pg_test = NULL;
	302	}
	303
44b83799 FI	304	static inline void
	305	pnfs_pageio_init_write(struct nfs_pageio_descriptor pgio, struct inode ino)
	306	{
	307	pgio->pg_test = NULL;
	308	}
	309
a861a1e1 FI	310	static inline void
	311	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	312	{
	313	}
	314
	315	static inline int
	316	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	317	{
	318	return PNFS_NOT_ATTEMPTED;
	319	}
	320
	321	static inline struct list_head *
	322	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	323	{
	324	return mds;
	325	}
	326
	327	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	328	{
	329	}
	330
ef311537	331	static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
863a3c6c AA	332	{
	333	return 0;
	334	}
85e174ba RL	335	#endif /* CONFIG_NFS_V4_1 */
	336
	337	#endif /* FS_NFS_PNFS_H */