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 int nfs2_decode_dirent(struct xdr_stream *,
 191                                 struct nfs_entry *, int);
 192
 193 /* nfs3xdr.c */
 194 extern struct rpc_procinfo nfs3_procedures[];
 195 extern int nfs3_decode_dirent(struct xdr_stream *,
 196                                 struct nfs_entry *, int);
 197
 198 /* nfs4xdr.c */
 199 #ifdef CONFIG_NFS_V4
 200 extern int nfs4_decode_dirent(struct xdr_stream *,
 201                                 struct nfs_entry *, int);
 202 #endif
 203 #ifdef CONFIG_NFS_V4_1
 204 extern const u32 nfs41_maxread_overhead;
 205 extern const u32 nfs41_maxwrite_overhead;
 206 #endif
 207
 208 /* nfs4proc.c */
 209 #ifdef CONFIG_NFS_V4
 210 extern struct rpc_procinfo nfs4_procedures[];
 211 #endif
 212
 213 /* proc.c */
 214 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 215
 216 /* dir.c */
 217 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
 218                                         int nr_to_scan, gfp_t gfp_mask);
 219
 220 /* inode.c */
 221 extern struct workqueue_struct *nfsiod_workqueue;
 222 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 223 extern void nfs_destroy_inode(struct inode *);
 224 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 225 extern void nfs_evict_inode(struct inode *);
 226 #ifdef CONFIG_NFS_V4
 227 extern void nfs4_evict_inode(struct inode *);
 228 #endif
 229 void nfs_zap_acl_cache(struct inode *inode);
 230 extern int nfs_wait_bit_killable(void *word);
 231
 232 /* super.c */
 233 extern struct file_system_type nfs_xdev_fs_type;
 234 #ifdef CONFIG_NFS_V4
 235 extern struct file_system_type nfs4_xdev_fs_type;
 236 extern struct file_system_type nfs4_referral_fs_type;
 237 #endif
 238
 239 extern struct rpc_stat nfs_rpcstat;
 240
 241 extern int __init register_nfs_fs(void);
 242 extern void __exit unregister_nfs_fs(void);
 243 extern void nfs_sb_active(struct super_block *sb);
 244 extern void nfs_sb_deactive(struct super_block *sb);
 245
 246 /* namespace.c */
 247 extern char *nfs_path(const char *base,
 248                       const struct dentry *droot,
 249                       const struct dentry *dentry,
 250                       char *buffer, ssize_t buflen);
 251
 252 /* getroot.c */
 253 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
 254 #ifdef CONFIG_NFS_V4
 255 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
 256
 257 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
 258 #endif
 259
 260 /* read.c */
 261 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 262
 263 /* write.c */
 264 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 265 #ifdef CONFIG_MIGRATION
 266 extern int nfs_migrate_page(struct address_space *,
 267                 struct page *, struct page *);
 268 #else
 269 #define nfs_migrate_page NULL
 270 #endif
 271
 272 /* nfs4proc.c */
 273 extern int _nfs4_call_sync(struct nfs_server *server,
 274                            struct rpc_message *msg,
 275                            struct nfs4_sequence_args *args,
 276                            struct nfs4_sequence_res *res,
 277                            int cache_reply);
 278 extern int _nfs4_call_sync_session(struct nfs_server *server,
 279                                    struct rpc_message *msg,
 280                                    struct nfs4_sequence_args *args,
 281                                    struct nfs4_sequence_res *res,
 282                                    int cache_reply);
 283
 284 /*
 285  * Determine the device name as a string
 286  */
 287 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
 288                                 const struct dentry *dentry,
 289                                 char *buffer, ssize_t buflen)
 290 {
 291         return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
 292                         dentry, buffer, buflen);
 293 }
 294
 295 /*
 296  * Determine the actual block size (and log2 thereof)
 297  */
 298 static inline
 299 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 300 {
 301         /* make sure blocksize is a power of two */
 302         if ((bsize & (bsize - 1)) || nrbitsp) {
 303                 unsigned char   nrbits;
 304
 305                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 306                         ;
 307                 bsize = 1 << nrbits;
 308                 if (nrbitsp)
 309                         *nrbitsp = nrbits;
 310         }
 311
 312         return bsize;
 313 }
 314
 315 /*
 316  * Calculate the number of 512byte blocks used.
 317  */
 318 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 319 {
 320         blkcnt_t used = (tsize + 511) >> 9;
 321         return (used > ULONG_MAX) ? ULONG_MAX : used;
 322 }
 323
 324 /*
 325  * Compute and set NFS server blocksize
 326  */
 327 static inline
 328 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 329 {
 330         if (bsize < NFS_MIN_FILE_IO_SIZE)
 331                 bsize = NFS_DEF_FILE_IO_SIZE;
 332         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 333                 bsize = NFS_MAX_FILE_IO_SIZE;
 334
 335         return nfs_block_bits(bsize, nrbitsp);
 336 }
 337
 338 /*
 339  * Determine the maximum file size for a superblock
 340  */
 341 static inline
 342 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 343 {
 344         sb->s_maxbytes = (loff_t)maxfilesize;
 345         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 346                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 347 }
 348
 349 /*
 350  * Determine the number of bytes of data the page contains
 351  */
 352 static inline
 353 unsigned int nfs_page_length(struct page *page)
 354 {
 355         loff_t i_size = i_size_read(page->mapping->host);
 356
 357         if (i_size > 0) {
 358                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 359                 if (page->index < end_index)
 360                         return PAGE_CACHE_SIZE;
 361                 if (page->index == end_index)
 362                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 363         }
 364         return 0;
 365 }
 366
 367 /*
 368  * Convert a umode to a dirent->d_type
 369  */
 370 static inline
 371 unsigned char nfs_umode_to_dtype(umode_t mode)
 372 {
 373         return (mode >> 12) & 15;
 374 }
 375
 376 /*
 377  * Determine the number of pages in an array of length 'len' and
 378  * with a base offset of 'base'
 379  */
 380 static inline
 381 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 382 {
 383         return ((unsigned long)len + (unsigned long)base +
 384                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 385 }
 386
 387 /*
 388  * Helper for restarting RPC calls in the possible presence of NFSv4.1
 389  * sessions.
 390  */
 391 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
 392 {
 393         if (nfs4_has_session(clp))
 394                 return rpc_restart_call_prepare(task);
 395         return rpc_restart_call(task);
 396 }