2df5480638
Propagate the NFS 'fsc' mount option through NFS automounts of various types.
This is now required as commit:
commit c02d7adf8c
Author: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Mon Jun 22 15:09:14 2009 -0400
NFSv4: Replace nfs4_path_walk() with VFS path lookup in a private namespace
uses VFS-driven automounting to reach all submounts barring the root, thus
preventing fscaching from being enabled on any submount other than the root.
This patch gets around that by propagating the NFS_OPTION_FSCACHE flag across
automounts. If a uniquifier is supplied to a mount then this is propagated to
all automounts of that mount too.
Signed-off-by: David Howells <dhowells@redhat.com>
[Trond: Fixed up the definition of nfs_fscache_get_super_cookie for the
case of #undef CONFIG_NFS_FSCACHE]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
222 lines
6.4 KiB
C
222 lines
6.4 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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* 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 *,
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const char *,
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struct nfs_clone_mount *);
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extern void nfs_fscache_release_super_cookie(struct super_block *);
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extern void nfs_fscache_init_inode_cookie(struct inode *);
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extern void nfs_fscache_release_inode_cookie(struct inode *);
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extern void nfs_fscache_zap_inode_cookie(struct inode *);
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extern void nfs_fscache_set_inode_cookie(struct inode *, struct file *);
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extern void nfs_fscache_reset_inode_cookie(struct inode *);
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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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* 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_get_super_cookie(
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struct super_block *sb,
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const char *uniq,
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struct nfs_clone_mount *mntdata)
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{
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}
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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_cookie(struct inode *inode) {}
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static inline void nfs_fscache_release_inode_cookie(struct inode *inode) {}
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static inline void nfs_fscache_zap_inode_cookie(struct inode *inode) {}
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static inline void nfs_fscache_set_inode_cookie(struct inode *inode,
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struct file *filp) {}
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static inline void nfs_fscache_reset_inode_cookie(struct inode *inode) {}
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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 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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