fs/nfs/internal.h

   1 /*
   2  * NFS internal definitions
   3  */
   4
   5 #include "nfs4_fs.h"
   6 #include <linux/mount.h>
   7 #include <linux/security.h>
   8
   9 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
  10
  11 struct nfs_string;
  12
  13 /* Maximum number of readahead requests
  14  * FIXME: this should really be a sysctl so that users may tune it to suit
  15  *        their needs. People that do NFS over a slow network, might for
  16  *        instance want to reduce it to something closer to 1 for improved
  17  *        interactive response.
  18  */
  19 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
  20
  21 /*
  22  * Determine if sessions are in use.
  23  */
  24 static inline int nfs4_has_session(const struct nfs_client *clp)
  25 {
  26 #ifdef CONFIG_NFS_V4_1
  27         if (clp->cl_session)
  28                 return 1;
  29 #endif /* CONFIG_NFS_V4_1 */
  30         return 0;
  31 }
  32
  33 static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
  34 {
  35 #ifdef CONFIG_NFS_V4_1
  36         if (nfs4_has_session(clp))
  37                 return (clp->cl_session->flags & SESSION4_PERSIST);
  38 #endif /* CONFIG_NFS_V4_1 */
  39         return 0;
  40 }
  41
  42 struct nfs_clone_mount {
  43         const struct super_block *sb;
  44         const struct dentry *dentry;
  45         struct nfs_fh *fh;
  46         struct nfs_fattr *fattr;
  47         char *hostname;
  48         char *mnt_path;
  49         struct sockaddr *addr;
  50         size_t addrlen;
  51         rpc_authflavor_t authflavor;
  52 };
  53
  54 /*
  55  * Note: RFC 1813 doesn't limit the number of auth flavors that
  56  * a server can return, so make something up.
  57  */
  58 #define NFS_MAX_SECFLAVORS      (12)
  59
  60 /*
  61  * Value used if the user did not specify a port value.
  62  */
  63 #define NFS_UNSPEC_PORT         (-1)
  64
  65 /*
  66  * Maximum number of pages that readdir can use for creating
  67  * a vmapped array of pages.
  68  */
  69 #define NFS_MAX_READDIR_PAGES 8
  70
  71 /*
  72  * In-kernel mount arguments
  73  */
  74 struct nfs_parsed_mount_data {
  75         int                     flags;
  76         int                     rsize, wsize;
  77         int                     timeo, retrans;
  78         int                     acregmin, acregmax,
  79                                 acdirmin, acdirmax;
  80         int                     namlen;
  81         unsigned int            options;
  82         unsigned int            bsize;
  83         unsigned int            auth_flavor_len;
  84         rpc_authflavor_t        auth_flavors[1];
  85         char                    *client_address;
  86         unsigned int            version;
  87         unsigned int            minorversion;
  88         char                    *fscache_uniq;
  89
  90         struct {
  91                 struct sockaddr_storage address;
  92                 size_t                  addrlen;
  93                 char                    *hostname;
  94                 u32                     version;
  95                 int                     port;
  96                 unsigned short          protocol;
  97         } mount_server;
  98
  99         struct {
 100                 struct sockaddr_storage address;
 101                 size_t                  addrlen;
 102                 char                    *hostname;
 103                 char                    *export_path;
 104                 int                     port;
 105                 unsigned short          protocol;
 106         } nfs_server;
 107
 108         struct security_mnt_opts lsm_opts;
 109 };
 110
 111 /* mount_clnt.c */
 112 struct nfs_mount_request {
 113         struct sockaddr         *sap;
 114         size_t                  salen;
 115         char                    *hostname;
 116         char                    *dirpath;
 117         u32                     version;
 118         unsigned short          protocol;
 119         struct nfs_fh           *fh;
 120         int                     noresvport;
 121         unsigned int            *auth_flav_len;
 122         rpc_authflavor_t        *auth_flavs;
 123 };
 124
 125 extern int nfs_mount(struct nfs_mount_request *info);
 126 extern void nfs_umount(const struct nfs_mount_request *info);
 127
 128 /* client.c */
 129 extern struct rpc_program nfs_program;
 130
 131 extern void nfs_cleanup_cb_ident_idr(void);
 132 extern void nfs_put_client(struct nfs_client *);
 133 extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
 134 extern struct nfs_client *nfs4_find_client_ident(int);
 135 extern struct nfs_client *
 136 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);
 137 extern struct nfs_server *nfs_create_server(
 138                                         const struct nfs_parsed_mount_data *,
 139                                         struct nfs_fh *);
 140 extern struct nfs_server *nfs4_create_server(
 141                                         const struct nfs_parsed_mount_data *,
 142                                         struct nfs_fh *);
 143 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 144                                                       struct nfs_fh *);
 145 extern void nfs_free_server(struct nfs_server *server);
 146 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 147                                            struct nfs_fh *,
 148                                            struct nfs_fattr *);
 149 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 150 extern int nfs4_check_client_ready(struct nfs_client *clp);
 151 #ifdef CONFIG_PROC_FS
 152 extern int __init nfs_fs_proc_init(void);
 153 extern void nfs_fs_proc_exit(void);
 154 #else
 155 static inline int nfs_fs_proc_init(void)
 156 {
 157         return 0;
 158 }
 159 static inline void nfs_fs_proc_exit(void)
 160 {
 161 }
 162 #endif
 163
 164 /* nfs4namespace.c */
 165 #ifdef CONFIG_NFS_V4
 166 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
 167 #else
 168 static inline
 169 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
 170 {
 171         return ERR_PTR(-ENOENT);
 172 }
 173 #endif
 174
 175 /* callback_xdr.c */
 176 extern struct svc_version nfs4_callback_version1;
 177 extern struct svc_version nfs4_callback_version4;
 178
 179 /* pagelist.c */
 180 extern int __init nfs_init_nfspagecache(void);
 181 extern void nfs_destroy_nfspagecache(void);
 182 extern int __init nfs_init_readpagecache(void);
 183 extern void nfs_destroy_readpagecache(void);
 184 extern int __init nfs_init_writepagecache(void);
 185 extern void nfs_destroy_writepagecache(void);
 186
 187 extern int __init nfs_init_directcache(void);
 188 extern void nfs_destroy_directcache(void);
 189
 190 /* nfs2xdr.c */
 191 extern int nfs_stat_to_errno(enum nfs_stat);
 192 extern struct rpc_procinfo nfs_procedures[];
 193 extern int nfs2_decode_dirent(struct xdr_stream *,
 194                                 struct nfs_entry *, int);
 195
 196 /* nfs3xdr.c */
 197 extern struct rpc_procinfo nfs3_procedures[];
 198 extern int nfs3_decode_dirent(struct xdr_stream *,
 199                                 struct nfs_entry *, int);
 200
 201 /* nfs4xdr.c */
 202 #ifdef CONFIG_NFS_V4
 203 extern int nfs4_decode_dirent(struct xdr_stream *,
 204                                 struct nfs_entry *, int);
 205 #endif
 206 #ifdef CONFIG_NFS_V4_1
 207 extern const u32 nfs41_maxread_overhead;
 208 extern const u32 nfs41_maxwrite_overhead;
 209 #endif
 210
 211 /* nfs4proc.c */
 212 #ifdef CONFIG_NFS_V4
 213 extern struct rpc_procinfo nfs4_procedures[];
 214 #endif
 215
 216 /* proc.c */
 217 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 218
 219 /* dir.c */
 220 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
 221                                         int nr_to_scan, gfp_t gfp_mask);
 222
 223 /* inode.c */
 224 extern struct workqueue_struct *nfsiod_workqueue;
 225 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 226 extern void nfs_destroy_inode(struct inode *);
 227 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 228 extern void nfs_evict_inode(struct inode *);
 229 #ifdef CONFIG_NFS_V4
 230 extern void nfs4_evict_inode(struct inode *);
 231 #endif
 232 void nfs_zap_acl_cache(struct inode *inode);
 233 extern int nfs_wait_bit_killable(void *word);
 234
 235 /* super.c */
 236 extern struct file_system_type nfs_xdev_fs_type;
 237 #ifdef CONFIG_NFS_V4
 238 extern struct file_system_type nfs4_xdev_fs_type;
 239 extern struct file_system_type nfs4_referral_fs_type;
 240 #endif
 241
 242 extern struct rpc_stat nfs_rpcstat;
 243
 244 extern int __init register_nfs_fs(void);
 245 extern void __exit unregister_nfs_fs(void);
 246 extern void nfs_sb_active(struct super_block *sb);
 247 extern void nfs_sb_deactive(struct super_block *sb);
 248
 249 /* namespace.c */
 250 extern char *nfs_path(const char *base,
 251                       const struct dentry *droot,
 252                       const struct dentry *dentry,
 253                       char *buffer, ssize_t buflen);
 254 extern struct vfsmount *nfs_d_automount(struct path *path);
 255
 256 /* getroot.c */
 257 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
 258 #ifdef CONFIG_NFS_V4
 259 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
 260
 261 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
 262 #endif
 263
 264 /* read.c */
 265 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 266
 267 /* write.c */
 268 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 269 #ifdef CONFIG_MIGRATION
 270 extern int nfs_migrate_page(struct address_space *,
 271                 struct page *, struct page *);
 272 #else
 273 #define nfs_migrate_page NULL
 274 #endif
 275
 276 /* nfs4proc.c */
 277 extern int _nfs4_call_sync(struct nfs_server *server,
 278                            struct rpc_message *msg,
 279                            struct nfs4_sequence_args *args,
 280                            struct nfs4_sequence_res *res,
 281                            int cache_reply);
 282 extern int _nfs4_call_sync_session(struct nfs_server *server,
 283                                    struct rpc_message *msg,
 284                                    struct nfs4_sequence_args *args,
 285                                    struct nfs4_sequence_res *res,
 286                                    int cache_reply);
 287
 288 /*
 289  * Determine the device name as a string
 290  */
 291 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 292                                 const struct dentry *dentry,
 293                                 char *buffer, ssize_t buflen)
 294 {
 295         return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
 296                         dentry, buffer, buflen);
 297 }
 298
 299 /*
 300  * Determine the actual block size (and log2 thereof)
 301  */
 302 static inline
 303 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 304 {
 305         /* make sure blocksize is a power of two */
 306         if ((bsize & (bsize - 1)) || nrbitsp) {
 307                 unsigned char   nrbits;
 308
 309                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 310                         ;
 311                 bsize = 1 << nrbits;
 312                 if (nrbitsp)
 313                         *nrbitsp = nrbits;
 314         }
 315
 316         return bsize;
 317 }
 318
 319 /*
 320  * Calculate the number of 512byte blocks used.
 321  */
 322 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 323 {
 324         blkcnt_t used = (tsize + 511) >> 9;
 325         return (used > ULONG_MAX) ? ULONG_MAX : used;
 326 }
 327
 328 /*
 329  * Compute and set NFS server blocksize
 330  */
 331 static inline
 332 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 333 {
 334         if (bsize < NFS_MIN_FILE_IO_SIZE)
 335                 bsize = NFS_DEF_FILE_IO_SIZE;
 336         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 337                 bsize = NFS_MAX_FILE_IO_SIZE;
 338
 339         return nfs_block_bits(bsize, nrbitsp);
 340 }
 341
 342 /*
 343  * Determine the maximum file size for a superblock
 344  */
 345 static inline
 346 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 347 {
 348         sb->s_maxbytes = (loff_t)maxfilesize;
 349         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 350                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 351 }
 352
 353 /*
 354  * Determine the number of bytes of data the page contains
 355  */
 356 static inline
 357 unsigned int nfs_page_length(struct page *page)
 358 {
 359         loff_t i_size = i_size_read(page->mapping->host);
 360
 361         if (i_size > 0) {
 362                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 363                 if (page->index < end_index)
 364                         return PAGE_CACHE_SIZE;
 365                 if (page->index == end_index)
 366                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 367         }
 368         return 0;
 369 }
 370
 371 /*
 372  * Convert a umode to a dirent->d_type
 373  */
 374 static inline
 375 unsigned char nfs_umode_to_dtype(umode_t mode)
 376 {
 377         return (mode >> 12) & 15;
 378 }
 379
 380 /*
 381  * Determine the number of pages in an array of length 'len' and
 382  * with a base offset of 'base'
 383  */
 384 static inline
 385 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 386 {
 387         return ((unsigned long)len + (unsigned long)base +
 388                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 389 }
 390
 391 /*
 392  * Helper for restarting RPC calls in the possible presence of NFSv4.1
 393  * sessions.
 394  */
 395 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
 396 {
 397         if (nfs4_has_session(clp))
 398                 return rpc_restart_call_prepare(task);
 399         return rpc_restart_call(task);
 400 }