157 строки
4.5 KiB
C
157 строки
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* 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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#ifndef _NFS_FSCACHE_H
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#define _NFS_FSCACHE_H
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#include <linux/swap.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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#include <linux/iversion.h>
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#ifdef CONFIG_NFS_FSCACHE
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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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s64 mtime_sec;
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s64 mtime_nsec;
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s64 ctime_sec;
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s64 ctime_nsec;
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u64 change_attr;
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};
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/*
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* fscache.c
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*/
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extern int 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_release_file(struct inode *, struct file *);
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extern int __nfs_readpage_from_fscache(struct inode *, struct page *);
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extern void __nfs_read_completion_to_fscache(struct nfs_pgio_header *hdr,
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unsigned long bytes);
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extern void __nfs_readpage_to_fscache(struct inode *, struct page *);
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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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if (PageFsCache(page)) {
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if (current_is_kswapd() || !(gfp & __GFP_FS))
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return false;
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wait_on_page_fscache(page);
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fscache_note_page_release(nfs_i_fscache(page->mapping->host));
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nfs_inc_fscache_stats(page->mapping->host,
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NFSIOS_FSCACHE_PAGES_UNCACHED);
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}
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return true;
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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 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(inode, page);
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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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{
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if (NFS_I(inode)->fscache)
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__nfs_readpage_to_fscache(inode, page);
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}
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static inline void nfs_fscache_update_auxdata(struct nfs_fscache_inode_auxdata *auxdata,
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struct nfs_inode *nfsi)
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{
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memset(auxdata, 0, sizeof(*auxdata));
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auxdata->mtime_sec = nfsi->vfs_inode.i_mtime.tv_sec;
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auxdata->mtime_nsec = nfsi->vfs_inode.i_mtime.tv_nsec;
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auxdata->ctime_sec = nfsi->vfs_inode.i_ctime.tv_sec;
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auxdata->ctime_nsec = nfsi->vfs_inode.i_ctime.tv_nsec;
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if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
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auxdata->change_attr = inode_peek_iversion_raw(&nfsi->vfs_inode);
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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, int flags)
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{
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struct nfs_fscache_inode_auxdata auxdata;
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struct nfs_inode *nfsi = NFS_I(inode);
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if (nfsi->fscache) {
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nfs_fscache_update_auxdata(&auxdata, nfsi);
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fscache_invalidate(nfsi->fscache, &auxdata,
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i_size_read(&nfsi->vfs_inode), flags);
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}
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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)
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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 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 void nfs_fscache_release_file(struct inode *inode, struct file *file) {}
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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 int nfs_readpage_from_fscache(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 void nfs_readpage_to_fscache(struct inode *inode,
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struct page *page) {}
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static inline void nfs_fscache_invalidate(struct inode *inode, int flags) {}
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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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