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_put_client(struct nfs_client *);
 132 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
 133 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
 134 extern struct nfs_server *nfs_create_server(
 135                                         const struct nfs_parsed_mount_data *,
 136                                         struct nfs_fh *);
 137 extern struct nfs_server *nfs4_create_server(
 138                                         const struct nfs_parsed_mount_data *,
 139                                         struct nfs_fh *);
 140 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 141                                                       struct nfs_fh *);
 142 extern void nfs_free_server(struct nfs_server *server);
 143 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 144                                            struct nfs_fh *,
 145                                            struct nfs_fattr *);
 146 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 147 extern int nfs4_check_client_ready(struct nfs_client *clp);
 148 #ifdef CONFIG_PROC_FS
 149 extern int __init nfs_fs_proc_init(void);
 150 extern void nfs_fs_proc_exit(void);
 151 #else
 152 static inline int nfs_fs_proc_init(void)
 153 {
 154         return 0;
 155 }
 156 static inline void nfs_fs_proc_exit(void)
 157 {
 158 }
 159 #endif
 160
 161 /* nfs4namespace.c */
 162 #ifdef CONFIG_NFS_V4
 163 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
 164 #else
 165 static inline
 166 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
 167 {
 168         return ERR_PTR(-ENOENT);
 169 }
 170 #endif
 171
 172 /* callback_xdr.c */
 173 extern struct svc_version nfs4_callback_version1;
 174 extern struct svc_version nfs4_callback_version4;
 175
 176 /* pagelist.c */
 177 extern int __init nfs_init_nfspagecache(void);
 178 extern void nfs_destroy_nfspagecache(void);
 179 extern int __init nfs_init_readpagecache(void);
 180 extern void nfs_destroy_readpagecache(void);
 181 extern int __init nfs_init_writepagecache(void);
 182 extern void nfs_destroy_writepagecache(void);
 183
 184 extern int __init nfs_init_directcache(void);
 185 extern void nfs_destroy_directcache(void);
 186
 187 /* nfs2xdr.c */
 188 extern int nfs_stat_to_errno(enum nfs_stat);
 189 extern struct rpc_procinfo nfs_procedures[];
 190 extern __be32 *nfs_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
 191
 192 /* nfs3xdr.c */
 193 extern struct rpc_procinfo nfs3_procedures[];
 194 extern __be32 *nfs3_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
 195
 196 /* nfs4xdr.c */
 197 #ifdef CONFIG_NFS_V4
 198 extern __be32 *nfs4_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
 199 #endif
 200 #ifdef CONFIG_NFS_V4_1
 201 extern const u32 nfs41_maxread_overhead;
 202 extern const u32 nfs41_maxwrite_overhead;
 203 #endif
 204
 205 /* nfs4proc.c */
 206 #ifdef CONFIG_NFS_V4
 207 extern struct rpc_procinfo nfs4_procedures[];
 208 #endif
 209
 210 /* proc.c */
 211 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 212
 213 /* dir.c */
 214 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
 215                                         int nr_to_scan, gfp_t gfp_mask);
 216
 217 /* inode.c */
 218 extern struct workqueue_struct *nfsiod_workqueue;
 219 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 220 extern void nfs_destroy_inode(struct inode *);
 221 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 222 extern void nfs_evict_inode(struct inode *);
 223 #ifdef CONFIG_NFS_V4
 224 extern void nfs4_evict_inode(struct inode *);
 225 #endif
 226 void nfs_zap_acl_cache(struct inode *inode);
 227 extern int nfs_wait_bit_killable(void *word);
 228
 229 /* super.c */
 230 extern struct file_system_type nfs_xdev_fs_type;
 231 #ifdef CONFIG_NFS_V4
 232 extern struct file_system_type nfs4_xdev_fs_type;
 233 extern struct file_system_type nfs4_referral_fs_type;
 234 #endif
 235
 236 extern struct rpc_stat nfs_rpcstat;
 237
 238 extern int __init register_nfs_fs(void);
 239 extern void __exit unregister_nfs_fs(void);
 240 extern void nfs_sb_active(struct super_block *sb);
 241 extern void nfs_sb_deactive(struct super_block *sb);
 242
 243 /* namespace.c */
 244 extern char *nfs_path(const char *base,
 245                       const struct dentry *droot,
 246                       const struct dentry *dentry,
 247                       char *buffer, ssize_t buflen);
 248
 249 /* getroot.c */
 250 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
 251 #ifdef CONFIG_NFS_V4
 252 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
 253
 254 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
 255 #endif
 256
 257 /* read.c */
 258 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 259
 260 /* write.c */
 261 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 262 #ifdef CONFIG_MIGRATION
 263 extern int nfs_migrate_page(struct address_space *,
 264                 struct page *, struct page *);
 265 #else
 266 #define nfs_migrate_page NULL
 267 #endif
 268
 269 /* nfs4proc.c */
 270 extern int _nfs4_call_sync(struct nfs_server *server,
 271                            struct rpc_message *msg,
 272                            struct nfs4_sequence_args *args,
 273                            struct nfs4_sequence_res *res,
 274                            int cache_reply);
 275 extern int _nfs4_call_sync_session(struct nfs_server *server,
 276                                    struct rpc_message *msg,
 277                                    struct nfs4_sequence_args *args,
 278                                    struct nfs4_sequence_res *res,
 279                                    int cache_reply);
 280
 281 /*
 282  * Determine the device name as a string
 283  */
 284 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 285                                 const struct dentry *dentry,
 286                                 char *buffer, ssize_t buflen)
 287 {
 288         return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
 289                         dentry, buffer, buflen);
 290 }
 291
 292 /*
 293  * Determine the actual block size (and log2 thereof)
 294  */
 295 static inline
 296 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 297 {
 298         /* make sure blocksize is a power of two */
 299         if ((bsize & (bsize - 1)) || nrbitsp) {
 300                 unsigned char   nrbits;
 301
 302                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 303                         ;
 304                 bsize = 1 << nrbits;
 305                 if (nrbitsp)
 306                         *nrbitsp = nrbits;
 307         }
 308
 309         return bsize;
 310 }
 311
 312 /*
 313  * Calculate the number of 512byte blocks used.
 314  */
 315 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 316 {
 317         blkcnt_t used = (tsize + 511) >> 9;
 318         return (used > ULONG_MAX) ? ULONG_MAX : used;
 319 }
 320
 321 /*
 322  * Compute and set NFS server blocksize
 323  */
 324 static inline
 325 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 326 {
 327         if (bsize < NFS_MIN_FILE_IO_SIZE)
 328                 bsize = NFS_DEF_FILE_IO_SIZE;
 329         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 330                 bsize = NFS_MAX_FILE_IO_SIZE;
 331
 332         return nfs_block_bits(bsize, nrbitsp);
 333 }
 334
 335 /*
 336  * Determine the maximum file size for a superblock
 337  */
 338 static inline
 339 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 340 {
 341         sb->s_maxbytes = (loff_t)maxfilesize;
 342         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 343                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 344 }
 345
 346 /*
 347  * Determine the number of bytes of data the page contains
 348  */
 349 static inline
 350 unsigned int nfs_page_length(struct page *page)
 351 {
 352         loff_t i_size = i_size_read(page->mapping->host);
 353
 354         if (i_size > 0) {
 355                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 356                 if (page->index < end_index)
 357                         return PAGE_CACHE_SIZE;
 358                 if (page->index == end_index)
 359                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 360         }
 361         return 0;
 362 }
 363
 364 /*
 365  * Convert a umode to a dirent->d_type
 366  */
 367 static inline
 368 unsigned char nfs_umode_to_dtype(umode_t mode)
 369 {
 370         return (mode >> 12) & 15;
 371 }
 372
 373 /*
 374  * Determine the number of pages in an array of length 'len' and
 375  * with a base offset of 'base'
 376  */
 377 static inline
 378 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 379 {
 380         return ((unsigned long)len + (unsigned long)base +
 381                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 382 }
 383
 384 /*
 385  * Helper for restarting RPC calls in the possible presence of NFSv4.1
 386  * sessions.
 387  */
 388 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
 389 {
 390         if (nfs4_has_session(clp))
 391                 return rpc_restart_call_prepare(task);
 392         return rpc_restart_call(task);
 393 }