[mirror_ubuntu-artful-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

#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 */
};

/* Per-layout driver specific registration structure */
struct pnfs_layoutdriver_type {
	struct list_head pnfs_tblid;
	const u32 id;
	const char *name;
	struct module *owner;
	int (*initialize_mountpoint) (struct nfs_server *);
	int (*uninitialize_mountpoint) (struct nfs_server *);
};

struct pnfs_layout_hdr {
	unsigned long		refcount;
	unsigned long		state;
	struct inode		*inode;
};

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

struct pnfs_layout_segment *
pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
		   enum pnfs_iomode access_type);
void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
void unset_pnfs_layoutdriver(struct nfs_server *);
void pnfs_destroy_layout(struct nfs_inode *);


static inline int lo_fail_bit(u32 iomode)
{
	return iomode == IOMODE_RW ?
			 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
}

/* 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;
}

#else  /* CONFIG_NFS_V4_1 */

static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
{
}

static inline struct pnfs_layout_segment *
pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
		   enum pnfs_iomode access_type)
{
	return NULL;
}

static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
{
}

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

#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
	33	#ifdef CONFIG_NFS_V4_1
	34
	35	#define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
	36
e5e94017 BH	37	enum {
	38	NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */
	39	NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */
	40	};
	41
85e174ba RL	42	/* Per-layout driver specific registration structure */
85e174ba RL	43	struct pnfs_layoutdriver_type {
02c35fca FI	44	struct list_head pnfs_tblid;
	45	const u32 id;
	46	const char *name;
	47	struct module *owner;
	48	int (initialize_mountpoint) (struct nfs_server );
	49	int (uninitialize_mountpoint) (struct nfs_server );
85e174ba RL	50	};
85e174ba RL	51
e5e94017 BH	52	struct pnfs_layout_hdr {
	53	unsigned long refcount;
	54	unsigned long state;
	55	struct inode *inode;
	56	};
	57
02c35fca FI	58	extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
	59	extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
	60
e5e94017 BH	61	struct pnfs_layout_segment *
	62	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
	63	enum pnfs_iomode access_type);
85e174ba RL	64	void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
85e174ba RL	65	void unset_pnfs_layoutdriver(struct nfs_server *);
e5e94017 BH	66	void pnfs_destroy_layout(struct nfs_inode *);
	67
	68
	69	static inline int lo_fail_bit(u32 iomode)
	70	{
	71	return iomode == IOMODE_RW ?
	72	NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
	73	}
	74
	75	/* Return true if a layout driver is being used for this mountpoint */
	76	static inline int pnfs_enabled_sb(struct nfs_server *nfss)
	77	{
	78	return nfss->pnfs_curr_ld != NULL;
	79	}
85e174ba RL	80
	81	#else /* CONFIG_NFS_V4_1 */
	82
e5e94017 BH	83	static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
	84	{
	85	}
	86
	87	static inline struct pnfs_layout_segment *
	88	pnfs_update_layout(struct inode ino, struct nfs_open_context ctx,
	89	enum pnfs_iomode access_type)
	90	{
	91	return NULL;
	92	}
	93
85e174ba RL	94	static inline void set_pnfs_layoutdriver(struct nfs_server *s, u32 id)
	95	{
	96	}
	97
	98	static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
	99	{
	100	}
	101
	102	#endif /* CONFIG_NFS_V4_1 */
	103
	104	#endif /* FS_NFS_PNFS_H */