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402cb8dda9
Attach copies of the index key and auxiliary data to the fscache cookie so
that:
(1) The callbacks to the netfs for this stuff can be eliminated. This
can simplify things in the cache as the information is still
available, even after the cache has relinquished the cookie.
(2) Simplifies the locking requirements of accessing the information as we
don't have to worry about the netfs object going away on us.
(3) The cache can do lazy updating of the coherency information on disk.
As long as the cache is flushed before reboot/poweroff, there's no
need to update the coherency info on disk every time it changes.
(4) Cookies can be hashed or put in a tree as the index key is easily
available. This allows:
(a) Checks for duplicate cookies can be made at the top fscache layer
rather than down in the bowels of the cache backend.
(b) Caching can be added to a netfs object that has a cookie if the
cache is brought online after the netfs object is allocated.
A certain amount of space is made in the cookie for inline copies of the
data, but if it won't fit there, extra memory will be allocated for it.
The downside of this is that live cache operation requires more memory.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Anna Schumaker <anna.schumaker@netapp.com>
Tested-by: Steve Dickson <steved@redhat.com>
246 lines
7.0 KiB
C
246 lines
7.0 KiB
C
/* NFS filesystem cache interface definitions
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*
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* Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _NFS_FSCACHE_H
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#define _NFS_FSCACHE_H
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/nfs4_mount.h>
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#include <linux/fscache.h>
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#ifdef CONFIG_NFS_FSCACHE
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/*
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* set of NFS FS-Cache objects that form a superblock key
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*/
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struct nfs_fscache_key {
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struct rb_node node;
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struct nfs_client *nfs_client; /* the server */
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/* the elements of the unique key - as used by nfs_compare_super() and
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* nfs_compare_mount_options() to distinguish superblocks */
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struct {
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struct {
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unsigned long s_flags; /* various flags
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* (& NFS_MS_MASK) */
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} super;
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struct {
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struct nfs_fsid fsid;
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int flags;
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unsigned int rsize; /* read size */
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unsigned int wsize; /* write size */
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unsigned int acregmin; /* attr cache timeouts */
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unsigned int acregmax;
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unsigned int acdirmin;
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unsigned int acdirmax;
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} nfs_server;
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struct {
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rpc_authflavor_t au_flavor;
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} rpc_auth;
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/* uniquifier - can be used if nfs_server.flags includes
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* NFS_MOUNT_UNSHARED */
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u8 uniq_len;
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char uniquifier[0];
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} key;
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};
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/*
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* Definition of the auxiliary data attached to NFS inode storage objects
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* within the cache.
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*
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* The contents of this struct are recorded in the on-disk local cache in the
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* auxiliary data attached to the data storage object backing an inode. This
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* permits coherency to be managed when a new inode binds to an already extant
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* cache object.
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*/
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struct nfs_fscache_inode_auxdata {
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struct timespec mtime;
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struct timespec ctime;
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loff_t size;
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u64 change_attr;
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};
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/*
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* fscache-index.c
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*/
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extern struct fscache_netfs nfs_fscache_netfs;
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extern const struct fscache_cookie_def nfs_fscache_server_index_def;
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extern const struct fscache_cookie_def nfs_fscache_super_index_def;
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extern const struct fscache_cookie_def nfs_fscache_inode_object_def;
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extern int nfs_fscache_register(void);
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extern void nfs_fscache_unregister(void);
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/*
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* fscache.c
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*/
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extern void nfs_fscache_get_client_cookie(struct nfs_client *);
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extern void nfs_fscache_release_client_cookie(struct nfs_client *);
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extern void nfs_fscache_get_super_cookie(struct super_block *, const char *, int);
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extern void nfs_fscache_release_super_cookie(struct super_block *);
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extern void nfs_fscache_init_inode(struct inode *);
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extern void nfs_fscache_clear_inode(struct inode *);
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extern void nfs_fscache_open_file(struct inode *, struct file *);
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extern void __nfs_fscache_invalidate_page(struct page *, struct inode *);
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extern int nfs_fscache_release_page(struct page *, gfp_t);
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extern int __nfs_readpage_from_fscache(struct nfs_open_context *,
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struct inode *, struct page *);
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extern int __nfs_readpages_from_fscache(struct nfs_open_context *,
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struct inode *, struct address_space *,
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struct list_head *, unsigned *);
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extern void __nfs_readpage_to_fscache(struct inode *, struct page *, int);
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/*
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* wait for a page to complete writing to the cache
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*/
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static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
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struct page *page)
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{
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if (PageFsCache(page))
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fscache_wait_on_page_write(nfsi->fscache, page);
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}
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/*
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* release the caching state associated with a page if undergoing complete page
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* invalidation
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*/
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static inline void nfs_fscache_invalidate_page(struct page *page,
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struct inode *inode)
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{
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if (PageFsCache(page))
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__nfs_fscache_invalidate_page(page, inode);
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}
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/*
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* Retrieve a page from an inode data storage object.
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*/
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static inline int nfs_readpage_from_fscache(struct nfs_open_context *ctx,
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struct inode *inode,
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struct page *page)
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{
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if (NFS_I(inode)->fscache)
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return __nfs_readpage_from_fscache(ctx, inode, page);
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return -ENOBUFS;
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}
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/*
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* Retrieve a set of pages from an inode data storage object.
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*/
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static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
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struct inode *inode,
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struct address_space *mapping,
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struct list_head *pages,
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unsigned *nr_pages)
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{
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if (NFS_I(inode)->fscache)
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return __nfs_readpages_from_fscache(ctx, inode, mapping, pages,
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nr_pages);
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return -ENOBUFS;
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}
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/*
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* Store a page newly fetched from the server in an inode data storage object
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* in the cache.
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*/
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static inline void nfs_readpage_to_fscache(struct inode *inode,
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struct page *page,
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int sync)
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{
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if (PageFsCache(page))
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__nfs_readpage_to_fscache(inode, page, sync);
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}
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/*
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* Invalidate the contents of fscache for this inode. This will not sleep.
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*/
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static inline void nfs_fscache_invalidate(struct inode *inode)
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{
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fscache_invalidate(NFS_I(inode)->fscache);
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}
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/*
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* Wait for an object to finish being invalidated.
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*/
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static inline void nfs_fscache_wait_on_invalidate(struct inode *inode)
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{
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fscache_wait_on_invalidate(NFS_I(inode)->fscache);
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}
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/*
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* indicate the client caching state as readable text
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*/
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static inline const char *nfs_server_fscache_state(struct nfs_server *server)
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{
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if (server->fscache && (server->options & NFS_OPTION_FSCACHE))
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return "yes";
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return "no ";
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}
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#else /* CONFIG_NFS_FSCACHE */
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static inline int nfs_fscache_register(void) { return 0; }
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static inline void nfs_fscache_unregister(void) {}
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static inline void nfs_fscache_get_client_cookie(struct nfs_client *clp) {}
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static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
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static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {}
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static inline void nfs_fscache_init_inode(struct inode *inode) {}
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static inline void nfs_fscache_clear_inode(struct inode *inode) {}
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static inline void nfs_fscache_open_file(struct inode *inode,
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struct file *filp) {}
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static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp)
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{
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return 1; /* True: may release page */
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}
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static inline void nfs_fscache_invalidate_page(struct page *page,
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struct inode *inode) {}
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static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
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struct page *page) {}
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static inline int nfs_readpage_from_fscache(struct nfs_open_context *ctx,
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struct inode *inode,
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struct page *page)
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{
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return -ENOBUFS;
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}
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static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
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struct inode *inode,
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struct address_space *mapping,
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struct list_head *pages,
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unsigned *nr_pages)
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{
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return -ENOBUFS;
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}
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static inline void nfs_readpage_to_fscache(struct inode *inode,
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struct page *page, int sync) {}
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static inline void nfs_fscache_invalidate(struct inode *inode) {}
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static inline void nfs_fscache_wait_on_invalidate(struct inode *inode) {}
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static inline const char *nfs_server_fscache_state(struct nfs_server *server)
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{
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return "no ";
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}
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#endif /* CONFIG_NFS_FSCACHE */
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#endif /* _NFS_FSCACHE_H */
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