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