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Release 4.12 include/linux/nfs_page.h

Directory: include/linux
 * linux/include/linux/nfs_page.h
 * Copyright (C) 2000 Trond Myklebust
 * NFS page cache wrapper.



#include <linux/list.h>
#include <linux/pagemap.h>
#include <linux/wait.h>
#include <linux/sunrpc/auth.h>
#include <linux/nfs_xdr.h>

#include <linux/kref.h>

 * Valid flags for a dirty buffer
enum {
PG_BUSY = 0,		/* nfs_{un}lock_request */
PG_MAPPED,		/* page private set for buffered io */
PG_CLEAN,		/* write succeeded */
PG_COMMIT_TO_DS,	/* used by pnfs layouts */
PG_INODE_REF,		/* extra ref held by inode when in writeback */
PG_HEADLOCK,		/* page group lock of wb_head */
PG_TEARDOWN,		/* page group sync for destroy */
PG_UNLOCKPAGE,		/* page group sync bit in read path */
PG_UPTODATE,		/* page group sync bit in read path */
PG_WB_END,		/* page group sync bit in write path */
PG_REMOVE,		/* page group sync bit in write path */

struct nfs_inode;

struct nfs_page {
struct list_head	wb_list;	/* Defines state of page: */
struct page		*wb_page;	/* page to read in/write out */
struct nfs_open_context	*wb_context;	/* File state context info */
struct nfs_lock_context	*wb_lock_context;	/* lock context info */
pgoff_t			wb_index;	/* Offset >> PAGE_SHIFT */
unsigned int		wb_offset,	/* Offset & ~PAGE_MASK */
wb_pgbase,	/* Start of page data */
wb_bytes;	/* Length of request */
struct kref		wb_kref;	/* reference count */
unsigned long		wb_flags;
struct nfs_write_verifier	wb_verf;	/* Commit cookie */
struct nfs_page		*wb_this_page;  /* list of reqs for this page */
struct nfs_page		*wb_head;       /* head pointer for req list */

struct nfs_pageio_descriptor;

struct nfs_pageio_ops {
void	(*pg_init)(struct nfs_pageio_descriptor *, struct nfs_page *);
size_t	(*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *,
			   struct nfs_page *);
int	(*pg_doio)(struct nfs_pageio_descriptor *);
unsigned int	(*pg_get_mirror_count)(struct nfs_pageio_descriptor *,
				       struct nfs_page *);
void	(*pg_cleanup)(struct nfs_pageio_descriptor *);

struct nfs_rw_ops {
struct nfs_pgio_header *(*rw_alloc_header)(void);
void (*rw_free_header)(struct nfs_pgio_header *);
int  (*rw_done)(struct rpc_task *, struct nfs_pgio_header *,
			struct inode *);
void (*rw_result)(struct rpc_task *, struct nfs_pgio_header *);
void (*rw_initiate)(struct nfs_pgio_header *, struct rpc_message *,
			    const struct nfs_rpc_ops *,
			    struct rpc_task_setup *, int);

struct nfs_pgio_mirror {
struct list_head	pg_list;
unsigned long		pg_bytes_written;
size_t			pg_count;
size_t			pg_bsize;
unsigned int		pg_base;
unsigned char		pg_recoalesce : 1;

struct nfs_pageio_descriptor {
unsigned char		pg_moreio : 1;
struct inode		*pg_inode;
const struct nfs_pageio_ops *pg_ops;
const struct nfs_rw_ops *pg_rw_ops;
int 			pg_ioflags;
int			pg_error;
const struct rpc_call_ops *pg_rpc_callops;
const struct nfs_pgio_completion_ops *pg_completion_ops;
struct pnfs_layout_segment *pg_lseg;
struct nfs_direct_req	*pg_dreq;
void			*pg_layout_private;
unsigned int		pg_bsize;	/* default bsize for mirrors */

u32			pg_mirror_count;
struct nfs_pgio_mirror	*pg_mirrors;
struct nfs_pgio_mirror	pg_mirrors_static[1];
struct nfs_pgio_mirror	*pg_mirrors_dynamic;
u32			pg_mirror_idx;	/* current mirror */

/* arbitrarily selected limit to number of mirrors */


#define NFS_WBACK_BUSY(req)	(test_bit(PG_BUSY,&(req)->wb_flags))

extern	struct nfs_page *nfs_create_request(struct nfs_open_context *ctx,
					    struct page *page,
					    struct nfs_page *last,
					    unsigned int offset,
					    unsigned int count);
extern	void nfs_release_request(struct nfs_page *);

extern	void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
			     struct inode *inode,
			     const struct nfs_pageio_ops *pg_ops,
			     const struct nfs_pgio_completion_ops *compl_ops,
			     const struct nfs_rw_ops *rw_ops,
			     size_t bsize,
			     int how,
			     gfp_t gfp_flags);
extern	int nfs_pageio_add_request(struct nfs_pageio_descriptor *,
				   struct nfs_page *);
extern  int nfs_pageio_resend(struct nfs_pageio_descriptor *,
			      struct nfs_pgio_header *);
extern	void nfs_pageio_complete(struct nfs_pageio_descriptor *desc);
extern	void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t);
extern size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
				struct nfs_page *prev,
				struct nfs_page *req);
extern  int nfs_wait_on_request(struct nfs_page *);
extern	void nfs_unlock_request(struct nfs_page *req);
extern	void nfs_unlock_and_release_request(struct nfs_page *);
extern int nfs_page_group_lock(struct nfs_page *, bool);
extern void nfs_page_group_lock_wait(struct nfs_page *);
extern void nfs_page_group_unlock(struct nfs_page *);
extern bool nfs_page_group_sync_on_bit(struct nfs_page *, unsigned int);
extern bool nfs_async_iocounter_wait(struct rpc_task *, struct nfs_lock_context *);

 * Lock the page of an asynchronous request

static inline int nfs_lock_request(struct nfs_page *req) { return !test_and_set_bit(PG_BUSY, &req->wb_flags); }


Trond Myklebust2187.50%250.00%
Linus Torvalds (pre-git)28.33%125.00%
Linus Torvalds14.17%125.00%

/** * nfs_list_add_request - Insert a request into a list * @req: request * @head: head of list into which to insert the request. */
static inline void nfs_list_add_request(struct nfs_page *req, struct list_head *head) { list_add_tail(&req->wb_list, head); }


Trond Myklebust27100.00%1100.00%

/** * nfs_list_remove_request - Remove a request from its wb_list * @req: request */
static inline void nfs_list_remove_request(struct nfs_page *req) { if (list_empty(&req->wb_list)) return; list_del_init(&req->wb_list); }


Linus Torvalds2993.55%150.00%
Linus Torvalds (pre-git)26.45%150.00%

static inline struct nfs_page * nfs_list_entry(struct list_head *head) { return list_entry(head, struct nfs_page, wb_list); }


Linus Torvalds (pre-git)1352.00%150.00%
Linus Torvalds1248.00%150.00%

static inline loff_t req_offset(struct nfs_page *req) { return (((loff_t)req->wb_index) << PAGE_SHIFT) + req->wb_offset; }


Trond Myklebust2996.67%150.00%
Kirill A. Shutemov13.33%150.00%

#endif /* _LINUX_NFS_PAGE_H */

Overall Contributors

Trond Myklebust30437.67%2644.83%
Weston Andros Adamson17721.93%1322.41%
Linus Torvalds (pre-git)11514.25%35.17%
Anna Schumaker8911.03%35.17%
Linus Torvalds496.07%11.72%
Fred Isaman242.97%46.90%
Benny Halevy192.35%11.72%
Benjamin Coddington161.98%23.45%
Tom Haynes50.62%11.72%
Peng Tao40.50%11.72%
Kirill A. Shutemov30.37%23.45%
Chuck Lever20.25%11.72%
Directory: include/linux
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