[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_fs.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 */
};

struct nfs4_deviceid_node;

/* 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);

	void (*free_deviceid_node) (struct nfs4_deviceid_node *);
};

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,
		   loff_t pos, u64 count, 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,
				struct pnfs_layout_range *recall_range);
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);

/* pnfs_dev.c */
struct nfs4_deviceid_node {
	struct hlist_node		node;
	const struct pnfs_layoutdriver_type *ld;
	const struct nfs_client		*nfs_client;
	struct nfs4_deviceid		deviceid;
	atomic_t			ref;
};

void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
struct nfs4_deviceid_node *nfs4_unhash_put_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
			     const struct pnfs_layoutdriver_type *,
			     const struct nfs_client *,
			     const struct nfs4_deviceid *);
struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
void nfs4_deviceid_purge_client(const struct nfs_client *);

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,
		   loff_t pos, u64 count, 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;
}

static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl)
{
}
#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
45df3c8b	33	#include <linux/nfs_fs.h>
94ad1c80 FI	34	#include <linux/nfs_page.h>
94ad1c80 FI	35
4541d16c FI	36	enum {
4541d16c FI	37	NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */
f7e8917a	38	NFS_LSEG_ROC, /* roc bit received from server */
4541d16c FI	39	};
4541d16c FI	40
974cec8c	41	struct pnfs_layout_segment {
566052c5 FI	42	struct list_head pls_list;
566052c5 FI	43	struct pnfs_layout_range pls_range;
4541d16c FI	44	atomic_t pls_refcount;
4541d16c FI	45	unsigned long pls_flags;
566052c5	46	struct pnfs_layout_hdr *pls_layout;
863a3c6c AA	47	struct rpc_cred pls_lc_cred; / LAYOUTCOMMIT credential */
863a3c6c AA	48	loff_t pls_end_pos; /* LAYOUTCOMMIT write end */
974cec8c AA	49	};
974cec8c AA	50
64419a9b AA	51	enum pnfs_try_status {
	52	PNFS_ATTEMPTED = 0,
	53	PNFS_NOT_ATTEMPTED = 1,
	54	};
	55
85e174ba RL	56	#ifdef CONFIG_NFS_V4_1
	57
	58	#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
	59
e5e94017 BH	60	enum {
	61	NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
	62	NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
43f1b3da	63	NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */
f7e8917a	64	NFS_LAYOUT_ROC, /* some lseg had roc bit set */
4541d16c	65	NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
e5e94017 BH	66	};
e5e94017 BH	67
1775bc34 BH	68	struct nfs4_deviceid_node;
1775bc34 BH	69
85e174ba RL	70	/* Per-layout driver specific registration structure */
85e174ba RL	71	struct pnfs_layoutdriver_type {
02c35fca FI	72	struct list_head pnfs_tblid;
	73	const u32 id;
	74	const char *name;
	75	struct module *owner;
a75b9df9	76	struct pnfs_layout_segment * (alloc_lseg) (struct pnfs_layout_hdr layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
b1f69b75	77	void (free_lseg) (struct pnfs_layout_segment lseg);
94ad1c80 FI	78
	79	/* test for nfs page cache coalescing */
	80	int (pg_test)(struct nfs_pageio_descriptor , struct nfs_page , struct nfs_page );
64419a9b	81
a861a1e1 FI	82	/* Returns true if layoutdriver wants to divert this request to
	83	* driver's commit routine.
	84	*/
	85	bool (mark_pnfs_commit)(struct pnfs_layout_segment lseg);
	86	struct list_head * (choose_commit_list) (struct nfs_page req);
	87	int (commit_pagelist)(struct inode inode, struct list_head *mds_pages, int how);
	88
64419a9b AA	89	/*
	90	* Return PNFS_ATTEMPTED to indicate the layout code has attempted
	91	* I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
	92	*/
	93	enum pnfs_try_status (read_pagelist) (struct nfs_read_data nfs_data);
0382b744	94	enum pnfs_try_status (write_pagelist) (struct nfs_write_data nfs_data, int how);
1775bc34 BH	95
1775bc34 BH	96	void (free_deviceid_node) (struct nfs4_deviceid_node );
85e174ba RL	97	};
85e174ba RL	98
e5e94017	99	struct pnfs_layout_hdr {
cc6e5340	100	atomic_t plh_refcount;
b7edfaa1	101	struct list_head plh_layouts; /* other client layouts */
43f1b3da	102	struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
b7edfaa1	103	struct list_head plh_segs; /* layout segments list */
b7edfaa1	104	nfs4_stateid plh_stateid;
cf7d63f1	105	atomic_t plh_outstanding; /* number of RPCs out */
f7e8917a	106	unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
43f1b3da	107	u32 plh_barrier; /* ignore lower seqids */
566052c5	108	unsigned long plh_flags;
b7edfaa1	109	struct inode *plh_inode;
e5e94017 BH	110	};
e5e94017 BH	111
b1f69b75 AA	112	struct pnfs_device {
	113	struct nfs4_deviceid dev_id;
	114	unsigned int layout_type;
	115	unsigned int mincount;
	116	struct page **pages;
b1f69b75 AA	117	unsigned int pgbase;
	118	unsigned int pglen;
	119	};
	120
02c35fca FI	121	extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
	122	extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
	123
b1f69b75 AA	124	/* nfs4proc.c */
	125	extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
	126	struct pnfs_device *dev);
	127	extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
	128
	129	/* pnfs.c */
43f1b3da	130	void get_layout_hdr(struct pnfs_layout_hdr *lo);
bae724ef	131	void put_lseg(struct pnfs_layout_segment *lseg);
e5e94017 BH	132	struct pnfs_layout_segment *
e5e94017 BH	133	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
fb3296eb BH	134	loff_t pos, u64 count, enum pnfs_iomode access_type,
fb3296eb BH	135	gfp_t gfp_flags);
85e174ba RL	136	void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
85e174ba RL	137	void unset_pnfs_layoutdriver(struct nfs_server *);
0382b744 AA	138	enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
0382b744 AA	139	const struct rpc_call_ops *, int);
64419a9b AA	140	enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
64419a9b AA	141	const struct rpc_call_ops *);
94ad1c80	142	void pnfs_pageio_init_read(struct nfs_pageio_descriptor , struct inode );
44b83799	143	void pnfs_pageio_init_write(struct nfs_pageio_descriptor , struct inode );
b1f69b75	144	int pnfs_layout_process(struct nfs4_layoutget *lgp);
43f1b3da	145	void pnfs_free_lseg_list(struct list_head *tmp_list);
e5e94017	146	void pnfs_destroy_layout(struct nfs_inode *);
974cec8c	147	void pnfs_destroy_all_layouts(struct nfs_client *);
cc6e5340	148	void put_layout_hdr(struct pnfs_layout_hdr *lo);
43f1b3da FI	149	void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
	150	const nfs4_stateid *new,
	151	bool update_barrier);
fd6002e9 FI	152	int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
	153	struct pnfs_layout_hdr *lo,
	154	struct nfs4_state *open_state);
43f1b3da FI	155	int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
43f1b3da FI	156	struct list_head *tmp_list,
778b5502	157	struct pnfs_layout_range *recall_range);
f7e8917a FI	158	bool pnfs_roc(struct inode *ino);
	159	void pnfs_roc_release(struct inode *ino);
	160	void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
	161	bool pnfs_roc_drain(struct inode ino, u32 barrier);
863a3c6c	162	void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
ef311537	163	int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
e5e94017	164
a1eaecbc BH	165	/* pnfs_dev.c */
	166	struct nfs4_deviceid_node {
	167	struct hlist_node node;
1775bc34	168	const struct pnfs_layoutdriver_type *ld;
a1eaecbc BH	169	const struct nfs_client *nfs_client;
	170	struct nfs4_deviceid deviceid;
	171	atomic_t ref;
	172	};
	173
	174	void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
35c8bb54 BH	175	struct nfs4_deviceid_node nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type , const struct nfs_client , const struct nfs4_deviceid );
	176	struct nfs4_deviceid_node nfs4_unhash_put_deviceid(const struct pnfs_layoutdriver_type , const struct nfs_client , const struct nfs4_deviceid );
	177	void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type , const struct nfs_client , const struct nfs4_deviceid *);
a1eaecbc	178	void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
1775bc34	179	const struct pnfs_layoutdriver_type *,
a1eaecbc BH	180	const struct nfs_client *,
	181	const struct nfs4_deviceid *);
	182	struct nfs4_deviceid_node nfs4_insert_deviceid_node(struct nfs4_deviceid_node );
	183	bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
1775bc34	184	void nfs4_deviceid_purge_client(const struct nfs_client *);
a1eaecbc	185
e5e94017 BH	186	static inline int lo_fail_bit(u32 iomode)
	187	{
	188	return iomode == IOMODE_RW ?
	189	NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
	190	}
	191
d684d2ae FI	192	static inline struct pnfs_layout_segment *
	193	get_lseg(struct pnfs_layout_segment *lseg)
	194	{
	195	if (lseg) {
	196	atomic_inc(&lseg->pls_refcount);
	197	smp_mb__after_atomic_inc();
	198	}
	199	return lseg;
	200	}
	201
e5e94017 BH	202	/* Return true if a layout driver is being used for this mountpoint */
	203	static inline int pnfs_enabled_sb(struct nfs_server *nfss)
	204	{
	205	return nfss->pnfs_curr_ld != NULL;
	206	}
85e174ba	207
a861a1e1 FI	208	static inline void
	209	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	210	{
	211	if (lseg) {
	212	struct pnfs_layoutdriver_type *ld;
	213
	214	ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
	215	if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
	216	set_bit(PG_PNFS_COMMIT, &req->wb_flags);
	217	req->wb_commit_lseg = get_lseg(lseg);
	218	}
	219	}
	220	}
	221
	222	static inline int
	223	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	224	{
	225	if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
	226	return PNFS_NOT_ATTEMPTED;
	227	return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
	228	}
	229
	230	static inline struct list_head *
	231	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	232	{
	233	struct list_head *rv;
	234
	235	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
	236	struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
	237
	238	set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
	239	rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
	240	/* matched by ref taken when PG_PNFS_COMMIT is set */
	241	put_lseg(req->wb_commit_lseg);
	242	} else
	243	rv = mds;
	244	return rv;
	245	}
	246
	247	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	248	{
	249	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
	250	put_lseg(req->wb_commit_lseg);
	251	}
	252
85e174ba RL	253	#else /* CONFIG_NFS_V4_1 */
85e174ba RL	254
974cec8c AA	255	static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
	256	{
	257	}
	258
e5e94017 BH	259	static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
	260	{
	261	}
	262
d684d2ae FI	263	static inline struct pnfs_layout_segment *
	264	get_lseg(struct pnfs_layout_segment *lseg)
	265	{
	266	return NULL;
	267	}
	268
	269	static inline void put_lseg(struct pnfs_layout_segment *lseg)
	270	{
	271	}
	272
e5e94017 BH	273	static inline struct pnfs_layout_segment *
e5e94017 BH	274	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
fb3296eb BH	275	loff_t pos, u64 count, enum pnfs_iomode access_type,
fb3296eb BH	276	gfp_t gfp_flags)
e5e94017 BH	277	{
	278	return NULL;
	279	}
	280
64419a9b AA	281	static inline enum pnfs_try_status
	282	pnfs_try_to_read_data(struct nfs_read_data *data,
	283	const struct rpc_call_ops *call_ops)
	284	{
	285	return PNFS_NOT_ATTEMPTED;
	286	}
	287
0382b744 AA	288	static inline enum pnfs_try_status
	289	pnfs_try_to_write_data(struct nfs_write_data *data,
	290	const struct rpc_call_ops *call_ops, int how)
	291	{
	292	return PNFS_NOT_ATTEMPTED;
	293	}
	294
f7e8917a FI	295	static inline bool
	296	pnfs_roc(struct inode *ino)
	297	{
	298	return false;
	299	}
	300
	301	static inline void
	302	pnfs_roc_release(struct inode *ino)
	303	{
	304	}
	305
	306	static inline void
	307	pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
	308	{
	309	}
	310
	311	static inline bool
	312	pnfs_roc_drain(struct inode ino, u32 barrier)
	313	{
	314	return false;
	315	}
	316
85e174ba RL	317	static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
	318	{
	319	}
	320
	321	static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
	322	{
	323	}
	324
94ad1c80 FI	325	static inline void
	326	pnfs_pageio_init_read(struct nfs_pageio_descriptor pgio, struct inode ino)
	327	{
	328	pgio->pg_test = NULL;
	329	}
	330
44b83799 FI	331	static inline void
	332	pnfs_pageio_init_write(struct nfs_pageio_descriptor pgio, struct inode ino)
	333	{
	334	pgio->pg_test = NULL;
	335	}
	336
a861a1e1 FI	337	static inline void
	338	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	339	{
	340	}
	341
	342	static inline int
	343	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	344	{
	345	return PNFS_NOT_ATTEMPTED;
	346	}
	347
	348	static inline struct list_head *
	349	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	350	{
	351	return mds;
	352	}
	353
	354	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	355	{
	356	}
	357
ef311537	358	static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
863a3c6c AA	359	{
	360	return 0;
	361	}
1775bc34 BH	362
	363	static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl)
	364	{
	365	}
85e174ba RL	366	#endif /* CONFIG_NFS_V4_1 */
	367
	368	#endif /* FS_NFS_PNFS_H */