[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 */
	NFS_LSEG_LAYOUTCOMMIT,	/* layoutcommit bit set for layoutcommit */
};

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

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

#ifdef CONFIG_NFS_V4_1

#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"

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

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

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;

	int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
	int (*clear_layoutdriver) (struct nfs_server *);

	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 */
	const struct nfs_pageio_ops *pg_read_ops;
	const struct nfs_pageio_ops *pg_write_ops;

	struct list_head * (*choose_commit_list) (struct nfs_page *req,
					struct pnfs_layout_segment *lseg);
	struct pnfs_layout_segment *(*remove_commit_req) (struct nfs_page *req);
	int (*scan_commit_lists) (struct inode *inode, int max);
	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 (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);

	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;
	loff_t			plh_lwb; /* last write byte for layoutcommit */
	struct rpc_cred		*plh_lc_cred; /* layoutcommit cred */
	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;
};

#define NFS4_PNFS_GETDEVLIST_MAXNUM 16

struct pnfs_devicelist {
	unsigned int		eof;
	unsigned int		num_devs;
	struct nfs4_deviceid	dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
};

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

/* nfs4proc.c */
extern int nfs4_proc_getdevicelist(struct nfs_server *server,
				   const struct nfs_fh *fh,
				   struct pnfs_devicelist *devlist);
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);

bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *, int);

void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
void unset_pnfs_layoutdriver(struct nfs_server *);
void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page *);
int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
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);
void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
int _pnfs_return_layout(struct inode *);
void pnfs_ld_write_done(struct nfs_write_data *);
void pnfs_ld_read_done(struct nfs_read_data *);
struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
					       struct nfs_open_context *ctx,
					       loff_t pos,
					       u64 count,
					       enum pnfs_iomode iomode,
					       gfp_t gfp_flags);

void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);

/* nfs4_deviceid_flags */
enum {
	NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
};

/* pnfs_dev.c */
struct nfs4_deviceid_node {
	struct hlist_node		node;
	struct hlist_node		tmpnode;
	const struct pnfs_layoutdriver_type *ld;
	const struct nfs_client		*nfs_client;
	unsigned long 			flags;
	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 *);
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 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 pnfs_layout_segment *lseg)
{
	struct inode *inode = req->wb_context->dentry->d_inode;
	struct list_head *rv;

	if (lseg && NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list)
		rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req, lseg);
	else
		rv = &NFS_I(inode)->commit_list;
	return rv;
}

static inline struct pnfs_layout_segment *
pnfs_clear_request_commit(struct nfs_page *req)
{
	struct inode *inode = req->wb_context->dentry->d_inode;

	if (NFS_SERVER(inode)->pnfs_curr_ld &&
	    NFS_SERVER(inode)->pnfs_curr_ld->remove_commit_req)
		return NFS_SERVER(inode)->pnfs_curr_ld->remove_commit_req(req);
	else
		return NULL;
}

static inline int
pnfs_scan_commit_lists(struct inode *inode, int max)
{
	if (NFS_SERVER(inode)->pnfs_curr_ld &&
	    NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists)
		return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(inode, max);
	else
		return 0;
}

/* 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;
}

#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 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,
					 const struct nfs_fh *mntfh, u32 id)
{
}

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

static inline bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
{
	return false;
}

static inline bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
{
	return false;
}

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 pnfs_layout_segment *lseg)
{
	struct inode *inode = req->wb_context->dentry->d_inode;

	return &NFS_I(inode)->commit_list;
}

static inline struct pnfs_layout_segment *
pnfs_clear_request_commit(struct nfs_page *req)
{
	return NULL;
}

static inline int
pnfs_scan_commit_lists(struct inode *inode, int max)
{
	return 0;
}

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
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 */
a9bae566	39	NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */
4541d16c FI	40	};
4541d16c FI	41
974cec8c	42	struct pnfs_layout_segment {
566052c5	43	struct list_head pls_list;
a9bae566	44	struct list_head pls_lc_list;
566052c5	45	struct pnfs_layout_range pls_range;
4541d16c FI	46	atomic_t pls_refcount;
4541d16c FI	47	unsigned long pls_flags;
566052c5	48	struct pnfs_layout_hdr *pls_layout;
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,
fe0fe835	71	PNFS_LAYOUTRET_ON_ERROR = 1 << 1,
8a1636c4 BH	72	};
8a1636c4 BH	73
1775bc34 BH	74	struct nfs4_deviceid_node;
1775bc34 BH	75
85e174ba RL	76	/* Per-layout driver specific registration structure */
85e174ba RL	77	struct pnfs_layoutdriver_type {
02c35fca FI	78	struct list_head pnfs_tblid;
	79	const u32 id;
	80	const char *name;
	81	struct module *owner;
8a1636c4	82	unsigned flags;
636fb9c8	83
738fd0f3 BH	84	int (set_layoutdriver) (struct nfs_server , const struct nfs_fh *);
	85	int (clear_layoutdriver) (struct nfs_server );
	86
636fb9c8 BH	87	struct pnfs_layout_hdr * (alloc_layout_hdr) (struct inode inode, gfp_t gfp_flags);
	88	void (free_layout_hdr) (struct pnfs_layout_hdr );
	89
a75b9df9	90	struct pnfs_layout_segment * (alloc_lseg) (struct pnfs_layout_hdr layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
b1f69b75	91	void (free_lseg) (struct pnfs_layout_segment lseg);
94ad1c80 FI	92
94ad1c80 FI	93	/* test for nfs page cache coalescing */
1751c363 TM	94	const struct nfs_pageio_ops *pg_read_ops;
1751c363 TM	95	const struct nfs_pageio_ops *pg_write_ops;
64419a9b	96
d6d6dc7c FI	97	struct list_head * (choose_commit_list) (struct nfs_page req,
	98	struct pnfs_layout_segment *lseg);
	99	struct pnfs_layout_segment (remove_commit_req) (struct nfs_page *req);
	100	int (scan_commit_lists) (struct inode inode, int max);
a861a1e1 FI	101	int (commit_pagelist)(struct inode inode, struct list_head *mds_pages, int how);
a861a1e1 FI	102
64419a9b AA	103	/*
	104	* Return PNFS_ATTEMPTED to indicate the layout code has attempted
	105	* I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
	106	*/
	107	enum pnfs_try_status (read_pagelist) (struct nfs_read_data nfs_data);
0382b744	108	enum pnfs_try_status (write_pagelist) (struct nfs_write_data nfs_data, int how);
1775bc34 BH	109
1775bc34 BH	110	void (free_deviceid_node) (struct nfs4_deviceid_node );
04a55549 AA	111
	112	void (encode_layoutreturn) (struct pnfs_layout_hdr layoutid,
	113	struct xdr_stream *xdr,
	114	const struct nfs4_layoutreturn_args *args);
ac7db726	115
db29c089 AA	116	void (cleanup_layoutcommit) (struct nfs4_layoutcommit_data data);
db29c089 AA	117
ac7db726 BH	118	void (encode_layoutcommit) (struct pnfs_layout_hdr layoutid,
	119	struct xdr_stream *xdr,
	120	const struct nfs4_layoutcommit_args *args);
85e174ba RL	121	};
85e174ba RL	122
e5e94017	123	struct pnfs_layout_hdr {
cc6e5340	124	atomic_t plh_refcount;
b7edfaa1	125	struct list_head plh_layouts; /* other client layouts */
43f1b3da	126	struct list_head plh_bulk_recall; /* clnt list of bulk recalls */
b7edfaa1	127	struct list_head plh_segs; /* layout segments list */
b7edfaa1	128	nfs4_stateid plh_stateid;
cf7d63f1	129	atomic_t plh_outstanding; /* number of RPCs out */
f7e8917a	130	unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */
43f1b3da	131	u32 plh_barrier; /* ignore lower seqids */
566052c5	132	unsigned long plh_flags;
acff5880	133	loff_t plh_lwb; /* last write byte for layoutcommit */
9fa40758	134	struct rpc_cred plh_lc_cred; / layoutcommit cred */
b7edfaa1	135	struct inode *plh_inode;
e5e94017 BH	136	};
e5e94017 BH	137
b1f69b75 AA	138	struct pnfs_device {
	139	struct nfs4_deviceid dev_id;
	140	unsigned int layout_type;
	141	unsigned int mincount;
	142	struct page **pages;
b1f69b75 AA	143	unsigned int pgbase;
	144	unsigned int pglen;
	145	};
	146
7f11d8d3 AA	147	#define NFS4_PNFS_GETDEVLIST_MAXNUM 16
	148
	149	struct pnfs_devicelist {
	150	unsigned int eof;
	151	unsigned int num_devs;
	152	struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
	153	};
	154
02c35fca FI	155	extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
	156	extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
	157
b1f69b75	158	/* nfs4proc.c */
7f11d8d3 AA	159	extern int nfs4_proc_getdevicelist(struct nfs_server *server,
	160	const struct nfs_fh *fh,
	161	struct pnfs_devicelist *devlist);
b1f69b75 AA	162	extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
	163	struct pnfs_device *dev);
	164	extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
cbe82603	165	extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
b1f69b75 AA	166
b1f69b75 AA	167	/* pnfs.c */
43f1b3da	168	void get_layout_hdr(struct pnfs_layout_hdr *lo);
bae724ef	169	void put_lseg(struct pnfs_layout_segment *lseg);
1751c363 TM	170
	171	bool pnfs_pageio_init_read(struct nfs_pageio_descriptor , struct inode );
	172	bool pnfs_pageio_init_write(struct nfs_pageio_descriptor , struct inode , int);
	173
738fd0f3	174	void set_pnfs_layoutdriver(struct nfs_server , const struct nfs_fh , u32);
85e174ba	175	void unset_pnfs_layoutdriver(struct nfs_server *);
d8007d4d	176	void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor , struct nfs_page );
493292dd	177	int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
d8007d4d	178	void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor , struct nfs_page );
dce81290	179	int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
18ad0a9f	180	bool pnfs_generic_pg_test(struct nfs_pageio_descriptor pgio, struct nfs_page prev, struct nfs_page *req);
1b0ae068	181	void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
b1f69b75	182	int pnfs_layout_process(struct nfs4_layoutget *lgp);
43f1b3da	183	void pnfs_free_lseg_list(struct list_head *tmp_list);
e5e94017	184	void pnfs_destroy_layout(struct nfs_inode *);
974cec8c	185	void pnfs_destroy_all_layouts(struct nfs_client *);
cc6e5340	186	void put_layout_hdr(struct pnfs_layout_hdr *lo);
43f1b3da FI	187	void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
	188	const nfs4_stateid *new,
	189	bool update_barrier);
fd6002e9 FI	190	int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
	191	struct pnfs_layout_hdr *lo,
	192	struct nfs4_state *open_state);
43f1b3da FI	193	int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
43f1b3da FI	194	struct list_head *tmp_list,
778b5502	195	struct pnfs_layout_range *recall_range);
f7e8917a FI	196	bool pnfs_roc(struct inode *ino);
	197	void pnfs_roc_release(struct inode *ino);
	198	void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
	199	bool pnfs_roc_drain(struct inode ino, u32 barrier);
863a3c6c	200	void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
db29c089	201	void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
ef311537	202	int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
cbe82603	203	int _pnfs_return_layout(struct inode *);
8ce160c5	204	void pnfs_ld_write_done(struct nfs_write_data *);
9b7eecdc	205	void pnfs_ld_read_done(struct nfs_read_data *);
7c24d948 AA	206	struct pnfs_layout_segment pnfs_update_layout(struct inode ino,
	207	struct nfs_open_context *ctx,
	208	loff_t pos,
	209	u64 count,
	210	enum pnfs_iomode iomode,
	211	gfp_t gfp_flags);
e5e94017	212
c47abcf8 AA	213	void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
	214
	215	/* nfs4_deviceid_flags */
	216	enum {
	217	NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */
	218	};
	219
a1eaecbc BH	220	/* pnfs_dev.c */
	221	struct nfs4_deviceid_node {
	222	struct hlist_node node;
9e3bd4e2	223	struct hlist_node tmpnode;
1775bc34	224	const struct pnfs_layoutdriver_type *ld;
a1eaecbc	225	const struct nfs_client *nfs_client;
c47abcf8	226	unsigned long flags;
a1eaecbc BH	227	struct nfs4_deviceid deviceid;
	228	atomic_t ref;
	229	};
	230
	231	void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
35c8bb54	232	struct nfs4_deviceid_node nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type , const struct nfs_client , const struct nfs4_deviceid );
35c8bb54	233	void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type , const struct nfs_client , const struct nfs4_deviceid *);
a1eaecbc	234	void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
1775bc34	235	const struct pnfs_layoutdriver_type *,
a1eaecbc BH	236	const struct nfs_client *,
	237	const struct nfs4_deviceid *);
	238	struct nfs4_deviceid_node nfs4_insert_deviceid_node(struct nfs4_deviceid_node );
	239	bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
1775bc34	240	void nfs4_deviceid_purge_client(const struct nfs_client *);
a1eaecbc	241
e5e94017 BH	242	static inline int lo_fail_bit(u32 iomode)
	243	{
	244	return iomode == IOMODE_RW ?
	245	NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
	246	}
	247
d684d2ae FI	248	static inline struct pnfs_layout_segment *
	249	get_lseg(struct pnfs_layout_segment *lseg)
	250	{
	251	if (lseg) {
	252	atomic_inc(&lseg->pls_refcount);
	253	smp_mb__after_atomic_inc();
	254	}
	255	return lseg;
	256	}
	257
e5e94017 BH	258	/* Return true if a layout driver is being used for this mountpoint */
	259	static inline int pnfs_enabled_sb(struct nfs_server *nfss)
	260	{
	261	return nfss->pnfs_curr_ld != NULL;
	262	}
85e174ba	263
a861a1e1 FI	264	static inline int
	265	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	266	{
	267	if (!test_and_clear_bit(NFS_INO_PNFS_COMMIT, &NFS_I(inode)->flags))
	268	return PNFS_NOT_ATTEMPTED;
	269	return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how);
	270	}
	271
	272	static inline struct list_head *
d6d6dc7c	273	pnfs_choose_commit_list(struct nfs_page req, struct pnfs_layout_segment lseg)
a861a1e1	274	{
d6d6dc7c	275	struct inode *inode = req->wb_context->dentry->d_inode;
a861a1e1 FI	276	struct list_head *rv;
a861a1e1 FI	277
d6d6dc7c FI	278	if (lseg && NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list)
	279	rv = NFS_SERVER(inode)->pnfs_curr_ld->choose_commit_list(req, lseg);
	280	else
	281	rv = &NFS_I(inode)->commit_list;
a861a1e1 FI	282	return rv;
	283	}
	284
d6d6dc7c FI	285	static inline struct pnfs_layout_segment *
d6d6dc7c FI	286	pnfs_clear_request_commit(struct nfs_page *req)
a861a1e1	287	{
d6d6dc7c FI	288	struct inode *inode = req->wb_context->dentry->d_inode;
	289
	290	if (NFS_SERVER(inode)->pnfs_curr_ld &&
	291	NFS_SERVER(inode)->pnfs_curr_ld->remove_commit_req)
	292	return NFS_SERVER(inode)->pnfs_curr_ld->remove_commit_req(req);
	293	else
	294	return NULL;
	295	}
	296
	297	static inline int
	298	pnfs_scan_commit_lists(struct inode *inode, int max)
	299	{
	300	if (NFS_SERVER(inode)->pnfs_curr_ld &&
	301	NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists)
	302	return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(inode, max);
	303	else
	304	return 0;
a861a1e1 FI	305	}
a861a1e1 FI	306
8a1636c4 BH	307	/* Should the pNFS client commit and return the layout upon a setattr */
	308	static inline bool
	309	pnfs_ld_layoutret_on_setattr(struct inode *inode)
	310	{
	311	if (!pnfs_enabled_sb(NFS_SERVER(inode)))
	312	return false;
	313	return NFS_SERVER(inode)->pnfs_curr_ld->flags &
	314	PNFS_LAYOUTRET_ON_SETATTR;
	315	}
	316
cbe82603 BH	317	static inline int pnfs_return_layout(struct inode *ino)
	318	{
	319	struct nfs_inode *nfsi = NFS_I(ino);
	320	struct nfs_server *nfss = NFS_SERVER(ino);
	321
	322	if (pnfs_enabled_sb(nfss) && nfsi->layout)
	323	return _pnfs_return_layout(ino);
	324
	325	return 0;
	326	}
	327
85e174ba RL	328	#else /* CONFIG_NFS_V4_1 */
85e174ba RL	329
974cec8c AA	330	static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
	331	{
	332	}
	333
e5e94017 BH	334	static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
	335	{
	336	}
	337
d684d2ae FI	338	static inline struct pnfs_layout_segment *
	339	get_lseg(struct pnfs_layout_segment *lseg)
	340	{
	341	return NULL;
	342	}
	343
	344	static inline void put_lseg(struct pnfs_layout_segment *lseg)
	345	{
	346	}
	347
cbe82603 BH	348	static inline int pnfs_return_layout(struct inode *ino)
	349	{
	350	return 0;
	351	}
	352
8a1636c4 BH	353	static inline bool
	354	pnfs_ld_layoutret_on_setattr(struct inode *inode)
	355	{
	356	return false;
	357	}
	358
f7e8917a FI	359	static inline bool
	360	pnfs_roc(struct inode *ino)
	361	{
	362	return false;
	363	}
	364
	365	static inline void
	366	pnfs_roc_release(struct inode *ino)
	367	{
	368	}
	369
	370	static inline void
	371	pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
	372	{
	373	}
	374
	375	static inline bool
	376	pnfs_roc_drain(struct inode ino, u32 barrier)
	377	{
	378	return false;
	379	}
	380
738fd0f3	381	static inline void set_pnfs_layoutdriver(struct nfs_server *s,
a00ed25c	382	const struct nfs_fh *mntfh, u32 id)
85e174ba RL	383	{
	384	}
	385
	386	static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
	387	{
	388	}
	389
1751c363	390	static inline bool pnfs_pageio_init_read(struct nfs_pageio_descriptor pgio, struct inode inode)
44b83799	391	{
1751c363 TM	392	return false;
	393	}
	394
	395	static inline bool pnfs_pageio_init_write(struct nfs_pageio_descriptor pgio, struct inode inode, int ioflags)
	396	{
	397	return false;
44b83799 FI	398	}
44b83799 FI	399
a861a1e1 FI	400	static inline int
	401	pnfs_commit_list(struct inode inode, struct list_head mds_pages, int how)
	402	{
	403	return PNFS_NOT_ATTEMPTED;
	404	}
	405
	406	static inline struct list_head *
d6d6dc7c	407	pnfs_choose_commit_list(struct nfs_page req, struct pnfs_layout_segment lseg)
a861a1e1	408	{
d6d6dc7c FI	409	struct inode *inode = req->wb_context->dentry->d_inode;
	410
	411	return &NFS_I(inode)->commit_list;
a861a1e1 FI	412	}
a861a1e1 FI	413
d6d6dc7c FI	414	static inline struct pnfs_layout_segment *
d6d6dc7c FI	415	pnfs_clear_request_commit(struct nfs_page *req)
a861a1e1	416	{
d6d6dc7c FI	417	return NULL;
	418	}
	419
	420	static inline int
	421	pnfs_scan_commit_lists(struct inode *inode, int max)
	422	{
	423	return 0;
a861a1e1 FI	424	}
a861a1e1 FI	425
ef311537	426	static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
863a3c6c AA	427	{
	428	return 0;
	429	}
1775bc34	430
85e174ba RL	431	#endif /* CONFIG_NFS_V4_1 */
	432
	433	#endif /* FS_NFS_PNFS_H */