Release 4.15 include/linux/nfs_page.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* 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 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 */
PG_CONTENDED1, /* Is someone waiting for a lock? */
PG_CONTENDED2, /* Is someone waiting for a lock? */
};
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_io_completion *pg_io_completion;
struct nfs_direct_req *pg_dreq;
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_PAGEIO_DESCRIPTOR_MIRROR_MAX 16
#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);
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 *);
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Trond Myklebust | 21 | 87.50% | 2 | 50.00% |
| Linus Torvalds (pre-git) | 2 | 8.33% | 1 | 25.00% |
| Linus Torvalds | 1 | 4.17% | 1 | 25.00% |
| Total | 24 | 100.00% | 4 | 100.00% |
/**
* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Trond Myklebust | 27 | 100.00% | 1 | 100.00% |
| Total | 27 | 100.00% | 1 | 100.00% |
/**
* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds | 29 | 93.55% | 1 | 50.00% |
| Linus Torvalds (pre-git) | 2 | 6.45% | 1 | 50.00% |
| Total | 31 | 100.00% | 2 | 100.00% |
static inline struct nfs_page *
nfs_list_entry(struct list_head *head)
{
return list_entry(head, struct nfs_page, wb_list);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 13 | 52.00% | 1 | 50.00% |
| Linus Torvalds | 12 | 48.00% | 1 | 50.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
static inline
loff_t req_offset(struct nfs_page *req)
{
return (((loff_t)req->wb_index) << PAGE_SHIFT) + req->wb_offset;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Trond Myklebust | 29 | 96.67% | 1 | 50.00% |
| Kirill A. Shutemov | 1 | 3.33% | 1 | 50.00% |
| Total | 30 | 100.00% | 2 | 100.00% |
#endif /* _LINUX_NFS_PAGE_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Trond Myklebust | 315 | 39.33% | 28 | 47.46% |
| Weston Andros Adamson | 166 | 20.72% | 13 | 22.03% |
| Linus Torvalds (pre-git) | 115 | 14.36% | 3 | 5.08% |
| Anna Schumaker | 89 | 11.11% | 3 | 5.08% |
| Linus Torvalds | 49 | 6.12% | 1 | 1.69% |
| Fred Isaman | 24 | 3.00% | 4 | 6.78% |
| Benny Halevy | 19 | 2.37% | 1 | 1.69% |
| Benjamin Coddington | 13 | 1.62% | 1 | 1.69% |
| Tom Haynes | 5 | 0.62% | 1 | 1.69% |
| Kirill A. Shutemov | 3 | 0.37% | 2 | 3.39% |
| Chuck Lever | 2 | 0.25% | 1 | 1.69% |
| Greg Kroah-Hartman | 1 | 0.12% | 1 | 1.69% |
| Total | 801 | 100.00% | 59 | 100.00% |
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