[mirror_ubuntu-zesty-kernel.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, gfp_t gfp_flags);
	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;
	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, gfp_t gfp_flags);
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, gfp_t gfp_flags)
{
	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;
a75b9df9	73	struct pnfs_layout_segment * (alloc_lseg) (struct pnfs_layout_hdr layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
b1f69b75	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;
b1f69b75 AA	112	unsigned int pgbase;
	113	unsigned int pglen;
	114	};
	115
02c35fca FI	116	extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
	117	extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
	118
b1f69b75 AA	119	/* nfs4proc.c */
	120	extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
	121	struct pnfs_device *dev);
	122	extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
	123
	124	/* pnfs.c */
43f1b3da	125	void get_layout_hdr(struct pnfs_layout_hdr *lo);
bae724ef	126	void put_lseg(struct pnfs_layout_segment *lseg);
e5e94017 BH	127	struct pnfs_layout_segment *
e5e94017 BH	128	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
a75b9df9	129	enum pnfs_iomode access_type, gfp_t gfp_flags);
85e174ba RL	130	void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
85e174ba RL	131	void unset_pnfs_layoutdriver(struct nfs_server *);
0382b744 AA	132	enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
0382b744 AA	133	const struct rpc_call_ops *, int);
64419a9b AA	134	enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
64419a9b AA	135	const struct rpc_call_ops *);
94ad1c80	136	void pnfs_pageio_init_read(struct nfs_pageio_descriptor , struct inode );
44b83799	137	void pnfs_pageio_init_write(struct nfs_pageio_descriptor , struct inode );
b1f69b75	138	int pnfs_layout_process(struct nfs4_layoutget *lgp);
43f1b3da	139	void pnfs_free_lseg_list(struct list_head *tmp_list);
e5e94017	140	void pnfs_destroy_layout(struct nfs_inode *);
974cec8c	141	void pnfs_destroy_all_layouts(struct nfs_client *);
cc6e5340	142	void put_layout_hdr(struct pnfs_layout_hdr *lo);
43f1b3da FI	143	void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
	144	const nfs4_stateid *new,
	145	bool update_barrier);
fd6002e9 FI	146	int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
	147	struct pnfs_layout_hdr *lo,
	148	struct nfs4_state *open_state);
43f1b3da FI	149	int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
	150	struct list_head *tmp_list,
	151	u32 iomode);
f7e8917a FI	152	bool pnfs_roc(struct inode *ino);
	153	void pnfs_roc_release(struct inode *ino);
	154	void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
	155	bool pnfs_roc_drain(struct inode ino, u32 barrier);
863a3c6c	156	void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
ef311537	157	int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
e5e94017 BH	158
	159	static inline int lo_fail_bit(u32 iomode)
	160	{
	161	return iomode == IOMODE_RW ?
	162	NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
	163	}
	164
d684d2ae FI	165	static inline struct pnfs_layout_segment *
	166	get_lseg(struct pnfs_layout_segment *lseg)
	167	{
	168	if (lseg) {
	169	atomic_inc(&lseg->pls_refcount);
	170	smp_mb__after_atomic_inc();
	171	}
	172	return lseg;
	173	}
	174
e5e94017 BH	175	/* Return true if a layout driver is being used for this mountpoint */
	176	static inline int pnfs_enabled_sb(struct nfs_server *nfss)
	177	{
	178	return nfss->pnfs_curr_ld != NULL;
	179	}
85e174ba	180
a861a1e1 FI	181	static inline void
	182	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	183	{
	184	if (lseg) {
	185	struct pnfs_layoutdriver_type *ld;
	186
	187	ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
	188	if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
	189	set_bit(PG_PNFS_COMMIT, &req->wb_flags);
	190	req->wb_commit_lseg = get_lseg(lseg);
	191	}
	192	}
	193	}
	194
	195	static inline int
	196	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	197	{
	198	if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
	199	return PNFS_NOT_ATTEMPTED;
	200	return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
	201	}
	202
	203	static inline struct list_head *
	204	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	205	{
	206	struct list_head *rv;
	207
	208	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
	209	struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
	210
	211	set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
	212	rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
	213	/* matched by ref taken when PG_PNFS_COMMIT is set */
	214	put_lseg(req->wb_commit_lseg);
	215	} else
	216	rv = mds;
	217	return rv;
	218	}
	219
	220	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	221	{
	222	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
	223	put_lseg(req->wb_commit_lseg);
	224	}
	225
85e174ba RL	226	#else /* CONFIG_NFS_V4_1 */
85e174ba RL	227
974cec8c AA	228	static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
	229	{
	230	}
	231
e5e94017 BH	232	static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
	233	{
	234	}
	235
d684d2ae FI	236	static inline struct pnfs_layout_segment *
	237	get_lseg(struct pnfs_layout_segment *lseg)
	238	{
	239	return NULL;
	240	}
	241
	242	static inline void put_lseg(struct pnfs_layout_segment *lseg)
	243	{
	244	}
	245
e5e94017 BH	246	static inline struct pnfs_layout_segment *
e5e94017 BH	247	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
a75b9df9	248	enum pnfs_iomode access_type, gfp_t gfp_flags)
e5e94017 BH	249	{
	250	return NULL;
	251	}
	252
64419a9b AA	253	static inline enum pnfs_try_status
	254	pnfs_try_to_read_data(struct nfs_read_data *data,
	255	const struct rpc_call_ops *call_ops)
	256	{
	257	return PNFS_NOT_ATTEMPTED;
	258	}
	259
0382b744 AA	260	static inline enum pnfs_try_status
	261	pnfs_try_to_write_data(struct nfs_write_data *data,
	262	const struct rpc_call_ops *call_ops, int how)
	263	{
	264	return PNFS_NOT_ATTEMPTED;
	265	}
	266
f7e8917a FI	267	static inline bool
	268	pnfs_roc(struct inode *ino)
	269	{
	270	return false;
	271	}
	272
	273	static inline void
	274	pnfs_roc_release(struct inode *ino)
	275	{
	276	}
	277
	278	static inline void
	279	pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
	280	{
	281	}
	282
	283	static inline bool
	284	pnfs_roc_drain(struct inode ino, u32 barrier)
	285	{
	286	return false;
	287	}
	288
85e174ba RL	289	static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
	290	{
	291	}
	292
	293	static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
	294	{
	295	}
	296
94ad1c80 FI	297	static inline void
	298	pnfs_pageio_init_read(struct nfs_pageio_descriptor pgio, struct inode ino)
	299	{
	300	pgio->pg_test = NULL;
	301	}
	302
44b83799 FI	303	static inline void
	304	pnfs_pageio_init_write(struct nfs_pageio_descriptor pgio, struct inode ino)
	305	{
	306	pgio->pg_test = NULL;
	307	}
	308
a861a1e1 FI	309	static inline void
	310	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	311	{
	312	}
	313
	314	static inline int
	315	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	316	{
	317	return PNFS_NOT_ATTEMPTED;
	318	}
	319
	320	static inline struct list_head *
	321	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	322	{
	323	return mds;
	324	}
	325
	326	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	327	{
	328	}
	329
ef311537	330	static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
863a3c6c AA	331	{
	332	return 0;
	333	}
85e174ba RL	334	#endif /* CONFIG_NFS_V4_1 */
	335
	336	#endif /* FS_NFS_PNFS_H */