diff options
Diffstat (limited to 'include/linux/nfs_page.h')
| -rw-r--r-- | include/linux/nfs_page.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h new file mode 100644 index 00000000..25311b3b --- /dev/null +++ b/include/linux/nfs_page.h @@ -0,0 +1,149 @@ +/* + * linux/include/linux/nfs_page.h + * + * Copyright (C) 2000 Trond Myklebust + * + * NFS page cache wrapper. + */ + +#ifndef _LINUX_NFS_PAGE_H +#define _LINUX_NFS_PAGE_H + + +#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 the radix tree + */ +#define NFS_PAGE_TAG_LOCKED 0 +#define NFS_PAGE_TAG_COMMIT 1 + +/* + * Valid flags for a dirty buffer + */ +enum { + PG_BUSY = 0, + PG_MAPPED, + PG_CLEAN, + PG_NEED_COMMIT, + PG_NEED_RESCHED, + PG_PNFS_COMMIT, +}; + +struct nfs_inode; +struct nfs_page { + union { + struct list_head wb_list; /* Defines state of page: */ + struct pnfs_layout_segment *wb_commit_lseg; /* Used when PG_PNFS_COMMIT set */ + }; + 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 */ + atomic_t wb_complete; /* i/os we're waiting for */ + pgoff_t wb_index; /* Offset >> PAGE_CACHE_SHIFT */ + unsigned int wb_offset, /* Offset & ~PAGE_CACHE_MASK */ + wb_pgbase, /* Start of page data */ + wb_bytes; /* Length of request */ + struct kref wb_kref; /* reference count */ + unsigned long wb_flags; + struct nfs_writeverf wb_verf; /* Commit cookie */ +}; + +struct nfs_pageio_descriptor { + struct list_head pg_list; + unsigned long pg_bytes_written; + size_t pg_count; + size_t pg_bsize; + unsigned int pg_base; + char pg_moreio; + + struct inode *pg_inode; + int (*pg_doio)(struct nfs_pageio_descriptor *); + int pg_ioflags; + int pg_error; + struct pnfs_layout_segment *pg_lseg; + bool (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *); +}; + +#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 inode *inode, + struct page *page, + unsigned int offset, + unsigned int count); +extern void nfs_release_request(struct nfs_page *req); + + +extern int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *dst, + pgoff_t idx_start, unsigned int npages, int tag); +extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc, + struct inode *inode, + int (*doio)(struct nfs_pageio_descriptor *desc), + size_t bsize, + int how); +extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *, + struct nfs_page *); +extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc); +extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t); +extern bool 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 int nfs_set_page_tag_locked(struct nfs_page *req); +extern void nfs_clear_page_tag_locked(struct nfs_page *req); + + +/* + * Lock the page of an asynchronous request without getting a new reference + */ +static inline int +nfs_lock_request_dontget(struct nfs_page *req) +{ + return !test_and_set_bit(PG_BUSY, &req->wb_flags); +} + +/** + * 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); +} + + +/** + * 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); +} + +static inline struct nfs_page * +nfs_list_entry(struct list_head *head) +{ + return list_entry(head, struct nfs_page, wb_list); +} + +static inline +loff_t req_offset(struct nfs_page *req) +{ + return (((loff_t)req->wb_index) << PAGE_CACHE_SHIFT) + req->wb_offset; +} + +#endif /* _LINUX_NFS_PAGE_H */ |