Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* NFS filesystem cache interface definitions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #ifndef _NFS_FSCACHE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #define _NFS_FSCACHE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/nfs_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/nfs_mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/nfs4_mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/fscache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #ifdef CONFIG_NFS_FSCACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * set of NFS FS-Cache objects that form a superblock key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) struct nfs_fscache_key {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	struct rb_node		node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	struct nfs_client	*nfs_client;	/* the server */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	/* the elements of the unique key - as used by nfs_compare_super() and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	 * nfs_compare_mount_options() to distinguish superblocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 			unsigned long	s_flags;	/* various flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 							 * (& NFS_MS_MASK) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 		} super;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 			struct nfs_fsid fsid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 			int		flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 			unsigned int	rsize;		/* read size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 			unsigned int	wsize;		/* write size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 			unsigned int	acregmin;	/* attr cache timeouts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 			unsigned int	acregmax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 			unsigned int	acdirmin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 			unsigned int	acdirmax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		} nfs_server;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			rpc_authflavor_t au_flavor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		} rpc_auth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		/* uniquifier - can be used if nfs_server.flags includes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		 * NFS_MOUNT_UNSHARED  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		u8 uniq_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		char uniquifier[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	} key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * Definition of the auxiliary data attached to NFS inode storage objects
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  * within the cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * The contents of this struct are recorded in the on-disk local cache in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * auxiliary data attached to the data storage object backing an inode.  This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  * permits coherency to be managed when a new inode binds to an already extant
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * cache object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) struct nfs_fscache_inode_auxdata {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	s64	mtime_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	s64	mtime_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	s64	ctime_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	s64	ctime_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	u64	change_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73)  * fscache-index.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) extern struct fscache_netfs nfs_fscache_netfs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) extern const struct fscache_cookie_def nfs_fscache_server_index_def;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) extern const struct fscache_cookie_def nfs_fscache_super_index_def;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) extern const struct fscache_cookie_def nfs_fscache_inode_object_def;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) extern int nfs_fscache_register(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) extern void nfs_fscache_unregister(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  * fscache.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) extern void nfs_fscache_get_client_cookie(struct nfs_client *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) extern void nfs_fscache_release_client_cookie(struct nfs_client *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) extern void nfs_fscache_get_super_cookie(struct super_block *, const char *, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) extern void nfs_fscache_release_super_cookie(struct super_block *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) extern void nfs_fscache_init_inode(struct inode *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) extern void nfs_fscache_clear_inode(struct inode *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) extern void nfs_fscache_open_file(struct inode *, struct file *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) extern void __nfs_fscache_invalidate_page(struct page *, struct inode *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) extern int nfs_fscache_release_page(struct page *, gfp_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) extern int __nfs_readpage_from_fscache(struct nfs_open_context *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 				       struct inode *, struct page *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) extern int __nfs_readpages_from_fscache(struct nfs_open_context *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 					struct inode *, struct address_space *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 					struct list_head *, unsigned *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) extern void __nfs_readpage_to_fscache(struct inode *, struct page *, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)  * wait for a page to complete writing to the cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 						  struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	if (PageFsCache(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		fscache_wait_on_page_write(nfsi->fscache, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)  * release the caching state associated with a page if undergoing complete page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)  * invalidation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static inline void nfs_fscache_invalidate_page(struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 					       struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (PageFsCache(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		__nfs_fscache_invalidate_page(page, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)  * Retrieve a page from an inode data storage object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static inline int nfs_readpage_from_fscache(struct nfs_open_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 					    struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 					    struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (NFS_I(inode)->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		return __nfs_readpage_from_fscache(ctx, inode, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * Retrieve a set of pages from an inode data storage object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 					     struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 					     struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 					     struct list_head *pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 					     unsigned *nr_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (NFS_I(inode)->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		return __nfs_readpages_from_fscache(ctx, inode, mapping, pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 						    nr_pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  * Store a page newly fetched from the server in an inode data storage object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)  * in the cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static inline void nfs_readpage_to_fscache(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 					   struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 					   int sync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (PageFsCache(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		__nfs_readpage_to_fscache(inode, page, sync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)  * Invalidate the contents of fscache for this inode.  This will not sleep.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static inline void nfs_fscache_invalidate(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	fscache_invalidate(NFS_I(inode)->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)  * Wait for an object to finish being invalidated.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static inline void nfs_fscache_wait_on_invalidate(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	fscache_wait_on_invalidate(NFS_I(inode)->fscache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  * indicate the client caching state as readable text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) static inline const char *nfs_server_fscache_state(struct nfs_server *server)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (server->fscache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		return "yes";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	return "no ";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) #else /* CONFIG_NFS_FSCACHE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static inline int nfs_fscache_register(void) { return 0; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static inline void nfs_fscache_unregister(void) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static inline void nfs_fscache_get_client_cookie(struct nfs_client *clp) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static inline void nfs_fscache_init_inode(struct inode *inode) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static inline void nfs_fscache_clear_inode(struct inode *inode) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static inline void nfs_fscache_open_file(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 					 struct file *filp) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	return 1; /* True: may release page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static inline void nfs_fscache_invalidate_page(struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 					       struct inode *inode) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static inline void nfs_fscache_wait_on_page_write(struct nfs_inode *nfsi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 						  struct page *page) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static inline int nfs_readpage_from_fscache(struct nfs_open_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 					    struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 					    struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 					     struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 					     struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 					     struct list_head *pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 					     unsigned *nr_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) static inline void nfs_readpage_to_fscache(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 					   struct page *page, int sync) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) static inline void nfs_fscache_invalidate(struct inode *inode) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) static inline void nfs_fscache_wait_on_invalidate(struct inode *inode) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static inline const char *nfs_server_fscache_state(struct nfs_server *server)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return "no ";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) #endif /* CONFIG_NFS_FSCACHE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) #endif /* _NFS_FSCACHE_H */