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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 | /* 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; }; /* * 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 */ |