214 строки
6.6 KiB
C
214 строки
6.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* linux/include/linux/nfs_page.h
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*
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* Copyright (C) 2000 Trond Myklebust
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*
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* NFS page cache wrapper.
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*/
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#ifndef _LINUX_NFS_PAGE_H
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#define _LINUX_NFS_PAGE_H
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#include <linux/list.h>
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#include <linux/pagemap.h>
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#include <linux/wait.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/nfs_xdr.h>
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#include <linux/kref.h>
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/*
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* Valid flags for a dirty buffer
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*/
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enum {
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PG_BUSY = 0, /* nfs_{un}lock_request */
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PG_MAPPED, /* page private set for buffered io */
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PG_CLEAN, /* write succeeded */
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PG_COMMIT_TO_DS, /* used by pnfs layouts */
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PG_INODE_REF, /* extra ref held by inode when in writeback */
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PG_HEADLOCK, /* page group lock of wb_head */
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PG_TEARDOWN, /* page group sync for destroy */
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PG_UNLOCKPAGE, /* page group sync bit in read path */
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PG_UPTODATE, /* page group sync bit in read path */
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PG_WB_END, /* page group sync bit in write path */
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PG_REMOVE, /* page group sync bit in write path */
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PG_CONTENDED1, /* Is someone waiting for a lock? */
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PG_CONTENDED2, /* Is someone waiting for a lock? */
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};
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struct nfs_inode;
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struct nfs_page {
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struct list_head wb_list; /* Defines state of page: */
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struct page *wb_page; /* page to read in/write out */
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struct nfs_lock_context *wb_lock_context; /* lock context info */
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pgoff_t wb_index; /* Offset >> PAGE_SHIFT */
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unsigned int wb_offset, /* Offset & ~PAGE_MASK */
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wb_pgbase, /* Start of page data */
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wb_bytes; /* Length of request */
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struct kref wb_kref; /* reference count */
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unsigned long wb_flags;
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struct nfs_write_verifier wb_verf; /* Commit cookie */
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struct nfs_page *wb_this_page; /* list of reqs for this page */
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struct nfs_page *wb_head; /* head pointer for req list */
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unsigned short wb_nio; /* Number of I/O attempts */
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};
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struct nfs_pageio_descriptor;
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struct nfs_pageio_ops {
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void (*pg_init)(struct nfs_pageio_descriptor *, struct nfs_page *);
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size_t (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *,
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struct nfs_page *);
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int (*pg_doio)(struct nfs_pageio_descriptor *);
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unsigned int (*pg_get_mirror_count)(struct nfs_pageio_descriptor *,
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struct nfs_page *);
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void (*pg_cleanup)(struct nfs_pageio_descriptor *);
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};
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struct nfs_rw_ops {
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struct nfs_pgio_header *(*rw_alloc_header)(void);
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void (*rw_free_header)(struct nfs_pgio_header *);
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int (*rw_done)(struct rpc_task *, struct nfs_pgio_header *,
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struct inode *);
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void (*rw_result)(struct rpc_task *, struct nfs_pgio_header *);
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void (*rw_initiate)(struct nfs_pgio_header *, struct rpc_message *,
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const struct nfs_rpc_ops *,
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struct rpc_task_setup *, int);
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};
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struct nfs_pgio_mirror {
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struct list_head pg_list;
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unsigned long pg_bytes_written;
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size_t pg_count;
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size_t pg_bsize;
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unsigned int pg_base;
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unsigned char pg_recoalesce : 1;
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};
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struct nfs_pageio_descriptor {
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struct inode *pg_inode;
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const struct nfs_pageio_ops *pg_ops;
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const struct nfs_rw_ops *pg_rw_ops;
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int pg_ioflags;
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int pg_error;
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const struct rpc_call_ops *pg_rpc_callops;
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const struct nfs_pgio_completion_ops *pg_completion_ops;
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struct pnfs_layout_segment *pg_lseg;
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struct nfs_io_completion *pg_io_completion;
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struct nfs_direct_req *pg_dreq;
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unsigned int pg_bsize; /* default bsize for mirrors */
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u32 pg_mirror_count;
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struct nfs_pgio_mirror *pg_mirrors;
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struct nfs_pgio_mirror pg_mirrors_static[1];
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struct nfs_pgio_mirror *pg_mirrors_dynamic;
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u32 pg_mirror_idx; /* current mirror */
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unsigned short pg_maxretrans;
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unsigned char pg_moreio : 1;
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};
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/* arbitrarily selected limit to number of mirrors */
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#define NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX 16
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#define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags))
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extern struct nfs_page *nfs_create_request(struct nfs_open_context *ctx,
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struct page *page,
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unsigned int offset,
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unsigned int count);
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extern void nfs_release_request(struct nfs_page *);
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extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
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struct inode *inode,
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const struct nfs_pageio_ops *pg_ops,
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const struct nfs_pgio_completion_ops *compl_ops,
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const struct nfs_rw_ops *rw_ops,
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size_t bsize,
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int how);
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extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *,
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struct nfs_page *);
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extern int nfs_pageio_resend(struct nfs_pageio_descriptor *,
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struct nfs_pgio_header *);
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extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc);
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extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t);
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extern size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
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struct nfs_page *prev,
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struct nfs_page *req);
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extern int nfs_wait_on_request(struct nfs_page *);
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extern void nfs_unlock_request(struct nfs_page *req);
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extern void nfs_unlock_and_release_request(struct nfs_page *);
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extern struct nfs_page *nfs_page_group_lock_head(struct nfs_page *req);
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extern int nfs_page_group_lock_subrequests(struct nfs_page *head);
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extern void nfs_join_page_group(struct nfs_page *head, struct inode *inode);
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extern int nfs_page_group_lock(struct nfs_page *);
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extern void nfs_page_group_unlock(struct nfs_page *);
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extern bool nfs_page_group_sync_on_bit(struct nfs_page *, unsigned int);
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extern int nfs_page_set_headlock(struct nfs_page *req);
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extern void nfs_page_clear_headlock(struct nfs_page *req);
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extern bool nfs_async_iocounter_wait(struct rpc_task *, struct nfs_lock_context *);
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/*
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* Lock the page of an asynchronous request
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*/
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static inline int
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nfs_lock_request(struct nfs_page *req)
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{
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return !test_and_set_bit(PG_BUSY, &req->wb_flags);
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}
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/**
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* nfs_list_add_request - Insert a request into a list
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* @req: request
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* @head: head of list into which to insert the request.
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*/
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static inline void
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nfs_list_add_request(struct nfs_page *req, struct list_head *head)
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{
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list_add_tail(&req->wb_list, head);
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}
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/**
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* nfs_list_move_request - Move a request to a new list
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* @req: request
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* @head: head of list into which to insert the request.
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*/
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static inline void
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nfs_list_move_request(struct nfs_page *req, struct list_head *head)
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{
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list_move_tail(&req->wb_list, head);
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}
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/**
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* nfs_list_remove_request - Remove a request from its wb_list
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* @req: request
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*/
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static inline void
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nfs_list_remove_request(struct nfs_page *req)
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{
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if (list_empty(&req->wb_list))
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return;
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list_del_init(&req->wb_list);
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}
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static inline struct nfs_page *
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nfs_list_entry(struct list_head *head)
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{
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return list_entry(head, struct nfs_page, wb_list);
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}
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static inline
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loff_t req_offset(struct nfs_page *req)
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{
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return (((loff_t)req->wb_index) << PAGE_SHIFT) + req->wb_offset;
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}
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static inline struct nfs_open_context *
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nfs_req_openctx(struct nfs_page *req)
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{
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return req->wb_lock_context->open_context;
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}
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#endif /* _LINUX_NFS_PAGE_H */
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