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 struct nfs_clone_mount {
  34         const struct super_block *sb;
  35         const struct dentry *dentry;
  36         struct nfs_fh *fh;
  37         struct nfs_fattr *fattr;
  38         char *hostname;
  39         char *mnt_path;
  40         struct sockaddr *addr;
  41         size_t addrlen;
  42         rpc_authflavor_t authflavor;
  43 };
  44
  45 /*
  46  * Note: RFC 1813 doesn't limit the number of auth flavors that
  47  * a server can return, so make something up.
  48  */
  49 #define NFS_MAX_SECFLAVORS      (12)
  50
  51 /*
  52  * Value used if the user did not specify a port value.
  53  */
  54 #define NFS_UNSPEC_PORT         (-1)
  55
  56 /*
  57  * In-kernel mount arguments
  58  */
  59 struct nfs_parsed_mount_data {
  60         int                     flags;
  61         int                     rsize, wsize;
  62         int                     timeo, retrans;
  63         int                     acregmin, acregmax,
  64                                 acdirmin, acdirmax;
  65         int                     namlen;
  66         unsigned int            options;
  67         unsigned int            bsize;
  68         unsigned int            auth_flavor_len;
  69         rpc_authflavor_t        auth_flavors[1];
  70         char                    *client_address;
  71         unsigned int            minorversion;
  72         char                    *fscache_uniq;
  73
  74         struct {
  75                 struct sockaddr_storage address;
  76                 size_t                  addrlen;
  77                 char                    *hostname;
  78                 u32                     version;
  79                 int                     port;
  80                 unsigned short          protocol;
  81         } mount_server;
  82
  83         struct {
  84                 struct sockaddr_storage address;
  85                 size_t                  addrlen;
  86                 char                    *hostname;
  87                 char                    *export_path;
  88                 int                     port;
  89                 unsigned short          protocol;
  90         } nfs_server;
  91
  92         struct security_mnt_opts lsm_opts;
  93 };
  94
  95 /* mount_clnt.c */
  96 struct nfs_mount_request {
  97         struct sockaddr         *sap;
  98         size_t                  salen;
  99         char                    *hostname;
 100         char                    *dirpath;
 101         u32                     version;
 102         unsigned short          protocol;
 103         struct nfs_fh           *fh;
 104         int                     noresvport;
 105         unsigned int            *auth_flav_len;
 106         rpc_authflavor_t        *auth_flavs;
 107 };
 108
 109 extern int nfs_mount(struct nfs_mount_request *info);
 110 extern void nfs_umount(const struct nfs_mount_request *info);
 111
 112 /* client.c */
 113 extern struct rpc_program nfs_program;
 114
 115 extern void nfs_put_client(struct nfs_client *);
 116 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
 117 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
 118 extern struct nfs_server *nfs_create_server(
 119                                         const struct nfs_parsed_mount_data *,
 120                                         struct nfs_fh *);
 121 extern struct nfs_server *nfs4_create_server(
 122                                         const struct nfs_parsed_mount_data *,
 123                                         struct nfs_fh *);
 124 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 125                                                       struct nfs_fh *);
 126 extern void nfs_free_server(struct nfs_server *server);
 127 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 128                                            struct nfs_fh *,
 129                                            struct nfs_fattr *);
 130 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 131 extern int nfs4_check_client_ready(struct nfs_client *clp);
 132 #ifdef CONFIG_PROC_FS
 133 extern int __init nfs_fs_proc_init(void);
 134 extern void nfs_fs_proc_exit(void);
 135 #else
 136 static inline int nfs_fs_proc_init(void)
 137 {
 138         return 0;
 139 }
 140 static inline void nfs_fs_proc_exit(void)
 141 {
 142 }
 143 #endif
 144
 145 /* nfs4namespace.c */
 146 #ifdef CONFIG_NFS_V4
 147 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
 148 #else
 149 static inline
 150 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
 151 {
 152         return ERR_PTR(-ENOENT);
 153 }
 154 #endif
 155
 156 /* callback_xdr.c */
 157 extern struct svc_version nfs4_callback_version1;
 158
 159 /* pagelist.c */
 160 extern int __init nfs_init_nfspagecache(void);
 161 extern void nfs_destroy_nfspagecache(void);
 162 extern int __init nfs_init_readpagecache(void);
 163 extern void nfs_destroy_readpagecache(void);
 164 extern int __init nfs_init_writepagecache(void);
 165 extern void nfs_destroy_writepagecache(void);
 166
 167 extern int __init nfs_init_directcache(void);
 168 extern void nfs_destroy_directcache(void);
 169
 170 /* nfs2xdr.c */
 171 extern int nfs_stat_to_errno(int);
 172 extern struct rpc_procinfo nfs_procedures[];
 173 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
 174
 175 /* nfs3xdr.c */
 176 extern struct rpc_procinfo nfs3_procedures[];
 177 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
 178
 179 /* nfs4proc.c */
 180 static inline void nfs4_restart_rpc(struct rpc_task *task,
 181                                     const struct nfs_client *clp)
 182 {
 183 #ifdef CONFIG_NFS_V4_1
 184         if (nfs4_has_session(clp) &&
 185             test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
 186                 rpc_restart_call_prepare(task);
 187                 return;
 188         }
 189 #endif /* CONFIG_NFS_V4_1 */
 190         rpc_restart_call(task);
 191 }
 192
 193 /* nfs4xdr.c */
 194 #ifdef CONFIG_NFS_V4
 195 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
 196 #endif
 197
 198 /* nfs4proc.c */
 199 #ifdef CONFIG_NFS_V4
 200 extern struct rpc_procinfo nfs4_procedures[];
 201 #endif
 202
 203 /* proc.c */
 204 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 205
 206 /* dir.c */
 207 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
 208
 209 /* inode.c */
 210 extern struct workqueue_struct *nfsiod_workqueue;
 211 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 212 extern void nfs_destroy_inode(struct inode *);
 213 extern int nfs_write_inode(struct inode *,int);
 214 extern void nfs_clear_inode(struct inode *);
 215 #ifdef CONFIG_NFS_V4
 216 extern void nfs4_clear_inode(struct inode *);
 217 #endif
 218 void nfs_zap_acl_cache(struct inode *inode);
 219 extern int nfs_wait_bit_killable(void *word);
 220
 221 /* super.c */
 222 extern struct file_system_type nfs_xdev_fs_type;
 223 #ifdef CONFIG_NFS_V4
 224 extern struct file_system_type nfs4_xdev_fs_type;
 225 extern struct file_system_type nfs4_referral_fs_type;
 226 #endif
 227
 228 extern struct rpc_stat nfs_rpcstat;
 229
 230 extern int __init register_nfs_fs(void);
 231 extern void __exit unregister_nfs_fs(void);
 232 extern void nfs_sb_active(struct super_block *sb);
 233 extern void nfs_sb_deactive(struct super_block *sb);
 234
 235 /* namespace.c */
 236 extern char *nfs_path(const char *base,
 237                       const struct dentry *droot,
 238                       const struct dentry *dentry,
 239                       char *buffer, ssize_t buflen);
 240
 241 /* getroot.c */
 242 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
 243 #ifdef CONFIG_NFS_V4
 244 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
 245
 246 extern int nfs4_path_walk(struct nfs_server *server,
 247                           struct nfs_fh *mntfh,
 248                           const char *path);
 249 #endif
 250
 251 /* read.c */
 252 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 253
 254 /* write.c */
 255 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 256 #ifdef CONFIG_MIGRATION
 257 extern int nfs_migrate_page(struct address_space *,
 258                 struct page *, struct page *);
 259 #else
 260 #define nfs_migrate_page NULL
 261 #endif
 262
 263 /* nfs4proc.c */
 264 extern int _nfs4_call_sync(struct nfs_server *server,
 265                            struct rpc_message *msg,
 266                            struct nfs4_sequence_args *args,
 267                            struct nfs4_sequence_res *res,
 268                            int cache_reply);
 269 extern int _nfs4_call_sync_session(struct nfs_server *server,
 270                                    struct rpc_message *msg,
 271                                    struct nfs4_sequence_args *args,
 272                                    struct nfs4_sequence_res *res,
 273                                    int cache_reply);
 274
 275 #ifdef CONFIG_NFS_V4_1
 276 extern void nfs41_sequence_free_slot(const struct nfs_client *,
 277                                      struct nfs4_sequence_res *res);
 278 #endif /* CONFIG_NFS_V4_1 */
 279
 280 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
 281                                            struct nfs4_sequence_res *res)
 282 {
 283 #ifdef CONFIG_NFS_V4_1
 284         if (nfs4_has_session(clp))
 285                 nfs41_sequence_free_slot(clp, res);
 286 #endif /* CONFIG_NFS_V4_1 */
 287 }
 288
 289 /*
 290  * Determine the device name as a string
 291  */
 292 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 293                                 const struct dentry *dentry,
 294                                 char *buffer, ssize_t buflen)
 295 {
 296         return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
 297                         dentry, buffer, buflen);
 298 }
 299
 300 /*
 301  * Determine the actual block size (and log2 thereof)
 302  */
 303 static inline
 304 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 305 {
 306         /* make sure blocksize is a power of two */
 307         if ((bsize & (bsize - 1)) || nrbitsp) {
 308                 unsigned char   nrbits;
 309
 310                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 311                         ;
 312                 bsize = 1 << nrbits;
 313                 if (nrbitsp)
 314                         *nrbitsp = nrbits;
 315         }
 316
 317         return bsize;
 318 }
 319
 320 /*
 321  * Calculate the number of 512byte blocks used.
 322  */
 323 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 324 {
 325         blkcnt_t used = (tsize + 511) >> 9;
 326         return (used > ULONG_MAX) ? ULONG_MAX : used;
 327 }
 328
 329 /*
 330  * Compute and set NFS server blocksize
 331  */
 332 static inline
 333 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 334 {
 335         if (bsize < NFS_MIN_FILE_IO_SIZE)
 336                 bsize = NFS_DEF_FILE_IO_SIZE;
 337         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 338                 bsize = NFS_MAX_FILE_IO_SIZE;
 339
 340         return nfs_block_bits(bsize, nrbitsp);
 341 }
 342
 343 /*
 344  * Determine the maximum file size for a superblock
 345  */
 346 static inline
 347 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 348 {
 349         sb->s_maxbytes = (loff_t)maxfilesize;
 350         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 351                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 352 }
 353
 354 /*
 355  * Determine the number of bytes of data the page contains
 356  */
 357 static inline
 358 unsigned int nfs_page_length(struct page *page)
 359 {
 360         loff_t i_size = i_size_read(page->mapping->host);
 361
 362         if (i_size > 0) {
 363                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 364                 if (page->index < end_index)
 365                         return PAGE_CACHE_SIZE;
 366                 if (page->index == end_index)
 367                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 368         }
 369         return 0;
 370 }
 371
 372 /*
 373  * Determine the number of pages in an array of length 'len' and
 374  * with a base offset of 'base'
 375  */
 376 static inline
 377 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 378 {
 379         return ((unsigned long)len + (unsigned long)base +
 380                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 381 }