245 строки
6.9 KiB
C
245 строки
6.9 KiB
C
/* NFS filesystem cache interface definitions
|
|
*
|
|
* Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _NFS_FSCACHE_H
|
|
#define _NFS_FSCACHE_H
|
|
|
|
#include <linux/nfs_fs.h>
|
|
#include <linux/nfs_mount.h>
|
|
#include <linux/nfs4_mount.h>
|
|
#include <linux/fscache.h>
|
|
|
|
#ifdef CONFIG_NFS_FSCACHE
|
|
|
|
/*
|
|
* set of NFS FS-Cache objects that form a superblock key
|
|
*/
|
|
struct nfs_fscache_key {
|
|
struct rb_node node;
|
|
struct nfs_client *nfs_client; /* the server */
|
|
|
|
/* the elements of the unique key - as used by nfs_compare_super() and
|
|
* nfs_compare_mount_options() to distinguish superblocks */
|
|
struct {
|
|
struct {
|
|
unsigned long s_flags; /* various flags
|
|
* (& NFS_MS_MASK) */
|
|
} super;
|
|
|
|
struct {
|
|
struct nfs_fsid fsid;
|
|
int flags;
|
|
unsigned int rsize; /* read size */
|
|
unsigned int wsize; /* write size */
|
|
unsigned int acregmin; /* attr cache timeouts */
|
|
unsigned int acregmax;
|
|
unsigned int acdirmin;
|
|
unsigned int acdirmax;
|
|
} nfs_server;
|
|
|
|
struct {
|
|
rpc_authflavor_t au_flavor;
|
|
} rpc_auth;
|
|
|
|
/* uniquifier - can be used if nfs_server.flags includes
|
|
* NFS_MOUNT_UNSHARED */
|
|
u8 uniq_len;
|
|
char uniquifier[0];
|
|
} key;
|
|
};
|
|
|
|
/*
|
|
* Definition of the auxiliary data attached to NFS inode storage objects
|
|
* within the cache.
|
|
*
|
|
* The contents of this struct are recorded in the on-disk local cache in the
|
|
* auxiliary data attached to the data storage object backing an inode. This
|
|
* permits coherency to be managed when a new inode binds to an already extant
|
|
* cache object.
|
|
*/
|
|
struct nfs_fscache_inode_auxdata {
|
|
struct timespec mtime;
|
|
struct timespec ctime;
|
|
u64 change_attr;
|
|
};
|
|
|
|
/*
|
|
* fscache-index.c
|
|
*/
|
|
extern struct fscache_netfs nfs_fscache_netfs;
|
|
extern const struct fscache_cookie_def nfs_fscache_server_index_def;
|
|
extern const struct fscache_cookie_def nfs_fscache_super_index_def;
|
|
extern const struct fscache_cookie_def nfs_fscache_inode_object_def;
|
|
|
|
extern int nfs_fscache_register(void);
|
|
extern void nfs_fscache_unregister(void);
|
|
|
|
/*
|
|
* fscache.c
|
|
*/
|
|
extern void nfs_fscache_get_client_cookie(struct nfs_client *);
|
|
extern void nfs_fscache_release_client_cookie(struct nfs_client *);
|
|
|
|
extern void nfs_fscache_get_super_cookie(struct super_block *, const char *, int);
|
|
extern void nfs_fscache_release_super_cookie(struct super_block *);
|
|
|
|
extern void nfs_fscache_init_inode(struct inode *);
|
|
extern void nfs_fscache_clear_inode(struct inode *);
|
|
extern void nfs_fscache_open_file(struct inode *, struct file *);
|
|
|
|
extern void __nfs_fscache_invalidate_page(struct page *, struct inode *);
|
|
extern int nfs_fscache_release_page(struct page *, gfp_t);
|
|
|
|
extern int __nfs_readpage_from_fscache(struct nfs_open_context *,
|
|
struct inode *, struct page *);
|
|
extern int __nfs_readpages_from_fscache(struct nfs_open_context *,
|
|
struct inode *, struct address_space *,
|
|
struct list_head *, unsigned *);
|
|
extern void __nfs_readpage_to_fscache(struct inode *, struct page *, int);
|
|
|
|
/*
|
|
* wait for a page to complete writing to the cache
|
|
*/
|
|
static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
|
|
struct page *page)
|
|
{
|
|
if (PageFsCache(page))
|
|
fscache_wait_on_page_write(nfsi->fscache, page);
|
|
}
|
|
|
|
/*
|
|
* release the caching state associated with a page if undergoing complete page
|
|
* invalidation
|
|
*/
|
|
static inline void nfs_fscache_invalidate_page(struct page *page,
|
|
struct inode *inode)
|
|
{
|
|
if (PageFsCache(page))
|
|
__nfs_fscache_invalidate_page(page, inode);
|
|
}
|
|
|
|
/*
|
|
* Retrieve a page from an inode data storage object.
|
|
*/
|
|
static inline int nfs_readpage_from_fscache(struct nfs_open_context *ctx,
|
|
struct inode *inode,
|
|
struct page *page)
|
|
{
|
|
if (NFS_I(inode)->fscache)
|
|
return __nfs_readpage_from_fscache(ctx, inode, page);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
/*
|
|
* Retrieve a set of pages from an inode data storage object.
|
|
*/
|
|
static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
|
|
struct inode *inode,
|
|
struct address_space *mapping,
|
|
struct list_head *pages,
|
|
unsigned *nr_pages)
|
|
{
|
|
if (NFS_I(inode)->fscache)
|
|
return __nfs_readpages_from_fscache(ctx, inode, mapping, pages,
|
|
nr_pages);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
/*
|
|
* Store a page newly fetched from the server in an inode data storage object
|
|
* in the cache.
|
|
*/
|
|
static inline void nfs_readpage_to_fscache(struct inode *inode,
|
|
struct page *page,
|
|
int sync)
|
|
{
|
|
if (PageFsCache(page))
|
|
__nfs_readpage_to_fscache(inode, page, sync);
|
|
}
|
|
|
|
/*
|
|
* Invalidate the contents of fscache for this inode. This will not sleep.
|
|
*/
|
|
static inline void nfs_fscache_invalidate(struct inode *inode)
|
|
{
|
|
fscache_invalidate(NFS_I(inode)->fscache);
|
|
}
|
|
|
|
/*
|
|
* Wait for an object to finish being invalidated.
|
|
*/
|
|
static inline void nfs_fscache_wait_on_invalidate(struct inode *inode)
|
|
{
|
|
fscache_wait_on_invalidate(NFS_I(inode)->fscache);
|
|
}
|
|
|
|
/*
|
|
* indicate the client caching state as readable text
|
|
*/
|
|
static inline const char *nfs_server_fscache_state(struct nfs_server *server)
|
|
{
|
|
if (server->fscache && (server->options & NFS_OPTION_FSCACHE))
|
|
return "yes";
|
|
return "no ";
|
|
}
|
|
|
|
#else /* CONFIG_NFS_FSCACHE */
|
|
static inline int nfs_fscache_register(void) { return 0; }
|
|
static inline void nfs_fscache_unregister(void) {}
|
|
|
|
static inline void nfs_fscache_get_client_cookie(struct nfs_client *clp) {}
|
|
static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
|
|
|
|
static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {}
|
|
|
|
static inline void nfs_fscache_init_inode(struct inode *inode) {}
|
|
static inline void nfs_fscache_clear_inode(struct inode *inode) {}
|
|
static inline void nfs_fscache_open_file(struct inode *inode,
|
|
struct file *filp) {}
|
|
|
|
static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp)
|
|
{
|
|
return 1; /* True: may release page */
|
|
}
|
|
static inline void nfs_fscache_invalidate_page(struct page *page,
|
|
struct inode *inode) {}
|
|
static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
|
|
struct page *page) {}
|
|
|
|
static inline int nfs_readpage_from_fscache(struct nfs_open_context *ctx,
|
|
struct inode *inode,
|
|
struct page *page)
|
|
{
|
|
return -ENOBUFS;
|
|
}
|
|
static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
|
|
struct inode *inode,
|
|
struct address_space *mapping,
|
|
struct list_head *pages,
|
|
unsigned *nr_pages)
|
|
{
|
|
return -ENOBUFS;
|
|
}
|
|
static inline void nfs_readpage_to_fscache(struct inode *inode,
|
|
struct page *page, int sync) {}
|
|
|
|
|
|
static inline void nfs_fscache_invalidate(struct inode *inode) {}
|
|
static inline void nfs_fscache_wait_on_invalidate(struct inode *inode) {}
|
|
|
|
static inline const char *nfs_server_fscache_state(struct nfs_server *server)
|
|
{
|
|
return "no ";
|
|
}
|
|
|
|
#endif /* CONFIG_NFS_FSCACHE */
|
|
#endif /* _NFS_FSCACHE_H */
|