[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 */
};

enum layoutdriver_policy_flags {
	/* Should the pNFS client commit and return the layout upon a setattr */
	PNFS_LAYOUTRET_ON_SETATTR	= 1 << 0,
};

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;
	unsigned flags;

	struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
	void (*free_layout_hdr) (struct pnfs_layout_hdr *);

	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 */
	bool (*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 *);

	void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
				     struct xdr_stream *xdr,
				     const struct nfs4_layoutreturn_args *args);

	void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
				     struct xdr_stream *xdr,
				     const struct nfs4_layoutcommit_args *args);
};

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);
extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);

/* 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 *);
bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
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);
int _pnfs_return_layout(struct inode *);
int pnfs_ld_write_done(struct nfs_write_data *);
int pnfs_ld_read_done(struct nfs_read_data *);

/* 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);
}

/* Should the pNFS client commit and return the layout upon a setattr */
static inline bool
pnfs_ld_layoutret_on_setattr(struct inode *inode)
{
	if (!pnfs_enabled_sb(NFS_SERVER(inode)))
		return false;
	return NFS_SERVER(inode)->pnfs_curr_ld->flags &
		PNFS_LAYOUTRET_ON_SETATTR;
}

static inline int pnfs_return_layout(struct inode *ino)
{
	struct nfs_inode *nfsi = NFS_I(ino);
	struct nfs_server *nfss = NFS_SERVER(ino);

	if (pnfs_enabled_sb(nfss) && nfsi->layout)
		return _pnfs_return_layout(ino);

	return 0;
}

static inline void pnfs_pageio_init(struct nfs_pageio_descriptor *pgio,
				    struct inode *inode)
{
	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;

	if (ld)
		pgio->pg_test = ld->pg_test;
}

#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 int pnfs_return_layout(struct inode *ino)
{
	return 0;
}

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

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(struct nfs_pageio_descriptor *pgio,
				    struct inode *inode)
{
}

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
8a1636c4 BH	68	enum layoutdriver_policy_flags {
	69	/* Should the pNFS client commit and return the layout upon a setattr */
	70	PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
	71	};
	72
1775bc34 BH	73	struct nfs4_deviceid_node;
1775bc34 BH	74
85e174ba RL	75	/* Per-layout driver specific registration structure */
85e174ba RL	76	struct pnfs_layoutdriver_type {
02c35fca FI	77	struct list_head pnfs_tblid;
	78	const u32 id;
	79	const char *name;
	80	struct module *owner;
8a1636c4	81	unsigned flags;
636fb9c8 BH	82
	83	struct pnfs_layout_hdr * (alloc_layout_hdr) (struct inode inode, gfp_t gfp_flags);
	84	void (free_layout_hdr) (struct pnfs_layout_hdr );
	85
a75b9df9	86	struct pnfs_layout_segment * (alloc_lseg) (struct pnfs_layout_hdr layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
b1f69b75	87	void (free_lseg) (struct pnfs_layout_segment lseg);
94ad1c80 FI	88
94ad1c80 FI	89	/* test for nfs page cache coalescing */
18ad0a9f	90	bool (pg_test)(struct nfs_pageio_descriptor , struct nfs_page , struct nfs_page );
64419a9b	91
a861a1e1 FI	92	/* Returns true if layoutdriver wants to divert this request to
	93	* driver's commit routine.
	94	*/
	95	bool (mark_pnfs_commit)(struct pnfs_layout_segment lseg);
	96	struct list_head * (choose_commit_list) (struct nfs_page req);
	97	int (commit_pagelist)(struct inode inode, struct list_head *mds_pages, int how);
	98
64419a9b AA	99	/*
	100	* Return PNFS_ATTEMPTED to indicate the layout code has attempted
	101	* I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
	102	*/
	103	enum pnfs_try_status (read_pagelist) (struct nfs_read_data nfs_data);
0382b744	104	enum pnfs_try_status (write_pagelist) (struct nfs_write_data nfs_data, int how);
1775bc34 BH	105
1775bc34 BH	106	void (free_deviceid_node) (struct nfs4_deviceid_node );
04a55549 AA	107
	108	void (encode_layoutreturn) (struct pnfs_layout_hdr layoutid,
	109	struct xdr_stream *xdr,
	110	const struct nfs4_layoutreturn_args *args);
ac7db726 BH	111
	112	void (encode_layoutcommit) (struct pnfs_layout_hdr layoutid,
	113	struct xdr_stream *xdr,
	114	const struct nfs4_layoutcommit_args *args);
85e174ba RL	115	};
85e174ba RL	116
e5e94017	117	struct pnfs_layout_hdr {
cc6e5340	118	atomic_t plh_refcount;
b7edfaa1	119	struct list_head plh_layouts; /* other client layouts */
43f1b3da	120	struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
b7edfaa1	121	struct list_head plh_segs; /* layout segments list */
b7edfaa1	122	nfs4_stateid plh_stateid;
cf7d63f1	123	atomic_t plh_outstanding; /* number of RPCs out */
f7e8917a	124	unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
43f1b3da	125	u32 plh_barrier; /* ignore lower seqids */
566052c5	126	unsigned long plh_flags;
b7edfaa1	127	struct inode *plh_inode;
e5e94017 BH	128	};
e5e94017 BH	129
b1f69b75 AA	130	struct pnfs_device {
	131	struct nfs4_deviceid dev_id;
	132	unsigned int layout_type;
	133	unsigned int mincount;
	134	struct page **pages;
b1f69b75 AA	135	unsigned int pgbase;
	136	unsigned int pglen;
	137	};
	138
02c35fca FI	139	extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
	140	extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
	141
b1f69b75 AA	142	/* nfs4proc.c */
	143	extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
	144	struct pnfs_device *dev);
	145	extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
cbe82603	146	extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
b1f69b75 AA	147
b1f69b75 AA	148	/* pnfs.c */
43f1b3da	149	void get_layout_hdr(struct pnfs_layout_hdr *lo);
bae724ef	150	void put_lseg(struct pnfs_layout_segment *lseg);
e5e94017 BH	151	struct pnfs_layout_segment *
e5e94017 BH	152	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
fb3296eb BH	153	loff_t pos, u64 count, enum pnfs_iomode access_type,
fb3296eb BH	154	gfp_t gfp_flags);
85e174ba RL	155	void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
85e174ba RL	156	void unset_pnfs_layoutdriver(struct nfs_server *);
0382b744 AA	157	enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
0382b744 AA	158	const struct rpc_call_ops *, int);
64419a9b AA	159	enum pnfs_try_status pnfs_try_to_read_data(struct nfs_read_data *,
64419a9b AA	160	const struct rpc_call_ops *);
18ad0a9f	161	bool pnfs_generic_pg_test(struct nfs_pageio_descriptor pgio, struct nfs_page prev, struct nfs_page *req);
b1f69b75	162	int pnfs_layout_process(struct nfs4_layoutget *lgp);
43f1b3da	163	void pnfs_free_lseg_list(struct list_head *tmp_list);
e5e94017	164	void pnfs_destroy_layout(struct nfs_inode *);
974cec8c	165	void pnfs_destroy_all_layouts(struct nfs_client *);
cc6e5340	166	void put_layout_hdr(struct pnfs_layout_hdr *lo);
43f1b3da FI	167	void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
	168	const nfs4_stateid *new,
	169	bool update_barrier);
fd6002e9 FI	170	int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
	171	struct pnfs_layout_hdr *lo,
	172	struct nfs4_state *open_state);
43f1b3da FI	173	int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
43f1b3da FI	174	struct list_head *tmp_list,
778b5502	175	struct pnfs_layout_range *recall_range);
f7e8917a FI	176	bool pnfs_roc(struct inode *ino);
	177	void pnfs_roc_release(struct inode *ino);
	178	void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
	179	bool pnfs_roc_drain(struct inode ino, u32 barrier);
863a3c6c	180	void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
ef311537	181	int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
cbe82603	182	int _pnfs_return_layout(struct inode *);
d20581aa BH	183	int pnfs_ld_write_done(struct nfs_write_data *);
d20581aa BH	184	int pnfs_ld_read_done(struct nfs_read_data *);
e5e94017	185
a1eaecbc BH	186	/* pnfs_dev.c */
	187	struct nfs4_deviceid_node {
	188	struct hlist_node node;
1775bc34	189	const struct pnfs_layoutdriver_type *ld;
a1eaecbc BH	190	const struct nfs_client *nfs_client;
	191	struct nfs4_deviceid deviceid;
	192	atomic_t ref;
	193	};
	194
	195	void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
35c8bb54 BH	196	struct nfs4_deviceid_node nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type , const struct nfs_client , const struct nfs4_deviceid );
	197	struct nfs4_deviceid_node nfs4_unhash_put_deviceid(const struct pnfs_layoutdriver_type , const struct nfs_client , const struct nfs4_deviceid );
	198	void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type , const struct nfs_client , const struct nfs4_deviceid *);
a1eaecbc	199	void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
1775bc34	200	const struct pnfs_layoutdriver_type *,
a1eaecbc BH	201	const struct nfs_client *,
	202	const struct nfs4_deviceid *);
	203	struct nfs4_deviceid_node nfs4_insert_deviceid_node(struct nfs4_deviceid_node );
	204	bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
1775bc34	205	void nfs4_deviceid_purge_client(const struct nfs_client *);
a1eaecbc	206
e5e94017 BH	207	static inline int lo_fail_bit(u32 iomode)
	208	{
	209	return iomode == IOMODE_RW ?
	210	NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
	211	}
	212
d684d2ae FI	213	static inline struct pnfs_layout_segment *
	214	get_lseg(struct pnfs_layout_segment *lseg)
	215	{
	216	if (lseg) {
	217	atomic_inc(&lseg->pls_refcount);
	218	smp_mb__after_atomic_inc();
	219	}
	220	return lseg;
	221	}
	222
e5e94017 BH	223	/* Return true if a layout driver is being used for this mountpoint */
	224	static inline int pnfs_enabled_sb(struct nfs_server *nfss)
	225	{
	226	return nfss->pnfs_curr_ld != NULL;
	227	}
85e174ba	228
a861a1e1 FI	229	static inline void
	230	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	231	{
	232	if (lseg) {
	233	struct pnfs_layoutdriver_type *ld;
	234
	235	ld = NFS_SERVER(req->wb_page->mapping->host)->pnfs_curr_ld;
	236	if (ld->mark_pnfs_commit && ld->mark_pnfs_commit(lseg)) {
	237	set_bit(PG_PNFS_COMMIT, &req->wb_flags);
	238	req->wb_commit_lseg = get_lseg(lseg);
	239	}
	240	}
	241	}
	242
	243	static inline int
	244	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	245	{
	246	if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
	247	return PNFS_NOT_ATTEMPTED;
	248	return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
	249	}
	250
	251	static inline struct list_head *
	252	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	253	{
	254	struct list_head *rv;
	255
	256	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags)) {
	257	struct inode *inode = req->wb_commit_lseg->pls_layout->plh_inode;
	258
	259	set_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags);
	260	rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req);
	261	/* matched by ref taken when PG_PNFS_COMMIT is set */
	262	put_lseg(req->wb_commit_lseg);
	263	} else
	264	rv = mds;
	265	return rv;
	266	}
	267
	268	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	269	{
	270	if (test_and_clear_bit(PG_PNFS_COMMIT, &req->wb_flags))
	271	put_lseg(req->wb_commit_lseg);
	272	}
	273
8a1636c4 BH	274	/* Should the pNFS client commit and return the layout upon a setattr */
	275	static inline bool
	276	pnfs_ld_layoutret_on_setattr(struct inode *inode)
	277	{
	278	if (!pnfs_enabled_sb(NFS_SERVER(inode)))
	279	return false;
	280	return NFS_SERVER(inode)->pnfs_curr_ld->flags &
	281	PNFS_LAYOUTRET_ON_SETATTR;
	282	}
	283
cbe82603 BH	284	static inline int pnfs_return_layout(struct inode *ino)
	285	{
	286	struct nfs_inode *nfsi = NFS_I(ino);
	287	struct nfs_server *nfss = NFS_SERVER(ino);
	288
	289	if (pnfs_enabled_sb(nfss) && nfsi->layout)
	290	return _pnfs_return_layout(ino);
	291
	292	return 0;
	293	}
	294
dfed206b BH	295	static inline void pnfs_pageio_init(struct nfs_pageio_descriptor *pgio,
	296	struct inode *inode)
	297	{
89a58e32 BH	298	struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
	299
	300	if (ld)
	301	pgio->pg_test = ld->pg_test;
dfed206b BH	302	}
dfed206b BH	303
85e174ba RL	304	#else /* CONFIG_NFS_V4_1 */
85e174ba RL	305
974cec8c AA	306	static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
	307	{
	308	}
	309
e5e94017 BH	310	static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
	311	{
	312	}
	313
d684d2ae FI	314	static inline struct pnfs_layout_segment *
	315	get_lseg(struct pnfs_layout_segment *lseg)
	316	{
	317	return NULL;
	318	}
	319
	320	static inline void put_lseg(struct pnfs_layout_segment *lseg)
	321	{
	322	}
	323
e5e94017 BH	324	static inline struct pnfs_layout_segment *
e5e94017 BH	325	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
fb3296eb BH	326	loff_t pos, u64 count, enum pnfs_iomode access_type,
fb3296eb BH	327	gfp_t gfp_flags)
e5e94017 BH	328	{
	329	return NULL;
	330	}
	331
64419a9b AA	332	static inline enum pnfs_try_status
	333	pnfs_try_to_read_data(struct nfs_read_data *data,
	334	const struct rpc_call_ops *call_ops)
	335	{
	336	return PNFS_NOT_ATTEMPTED;
	337	}
	338
0382b744 AA	339	static inline enum pnfs_try_status
	340	pnfs_try_to_write_data(struct nfs_write_data *data,
	341	const struct rpc_call_ops *call_ops, int how)
	342	{
	343	return PNFS_NOT_ATTEMPTED;
	344	}
	345
cbe82603 BH	346	static inline int pnfs_return_layout(struct inode *ino)
	347	{
	348	return 0;
	349	}
	350
8a1636c4 BH	351	static inline bool
	352	pnfs_ld_layoutret_on_setattr(struct inode *inode)
	353	{
	354	return false;
	355	}
	356
f7e8917a FI	357	static inline bool
	358	pnfs_roc(struct inode *ino)
	359	{
	360	return false;
	361	}
	362
	363	static inline void
	364	pnfs_roc_release(struct inode *ino)
	365	{
	366	}
	367
	368	static inline void
	369	pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
	370	{
	371	}
	372
	373	static inline bool
	374	pnfs_roc_drain(struct inode ino, u32 barrier)
	375	{
	376	return false;
	377	}
	378
85e174ba RL	379	static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
	380	{
	381	}
	382
	383	static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
	384	{
	385	}
	386
dfed206b BH	387	static inline void pnfs_pageio_init(struct nfs_pageio_descriptor *pgio,
dfed206b BH	388	struct inode *inode)
44b83799	389	{
44b83799 FI	390	}
44b83799 FI	391
a861a1e1 FI	392	static inline void
	393	pnfs_mark_request_commit(struct nfs_page req, struct pnfs_layout_segment lseg)
	394	{
	395	}
	396
	397	static inline int
	398	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	399	{
	400	return PNFS_NOT_ATTEMPTED;
	401	}
	402
	403	static inline struct list_head *
	404	pnfs_choose_commit_list(struct nfs_page req, struct list_head mds)
	405	{
	406	return mds;
	407	}
	408
	409	static inline void pnfs_clear_request_commit(struct nfs_page *req)
	410	{
	411	}
	412
ef311537	413	static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
863a3c6c AA	414	{
	415	return 0;
	416	}
1775bc34 BH	417
	418	static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl)
	419	{
	420	}
85e174ba RL	421	#endif /* CONFIG_NFS_V4_1 */
	422
	423	#endif /* FS_NFS_PNFS_H */