include/linux/nfsd/nfsd.h

   1 /*
   2  * linux/include/linux/nfsd/nfsd.h
   3  *
   4  * Hodge-podge collection of knfsd-related stuff.
   5  * I will sort this out later.
   6  *
   7  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   8  */
   9
  10 #ifndef LINUX_NFSD_NFSD_H
  11 #define LINUX_NFSD_NFSD_H
  12
  13 #include <linux/types.h>
  14 #include <linux/unistd.h>
  15 #include <linux/dirent.h>
  16 #include <linux/fs.h>
  17 #include <linux/posix_acl.h>
  18 #include <linux/mount.h>
  19
  20 #include <linux/nfsd/debug.h>
  21 #include <linux/nfsd/nfsfh.h>
  22 #include <linux/nfsd/export.h>
  23 #include <linux/nfsd/stats.h>
  24 /*
  25  * nfsd version
  26  */
  27 #define NFSD_VERSION            "0.5"
  28 #define NFSD_SUPPORTED_MINOR_VERSION    0
  29
  30 /*
  31  * Special flags for nfsd_permission. These must be different from MAY_READ,
  32  * MAY_WRITE, and MAY_EXEC.
  33  */
  34 #define MAY_NOP                 0
  35 #define MAY_SATTR               8
  36 #define MAY_TRUNC               16
  37 #define MAY_LOCK                32
  38 #define MAY_OWNER_OVERRIDE      64
  39 #define MAY_LOCAL_ACCESS        128 /* IRIX doing local access check on device special file*/
  40 #if (MAY_SATTR | MAY_TRUNC | MAY_LOCK | MAY_OWNER_OVERRIDE | MAY_LOCAL_ACCESS) & (MAY_READ | MAY_WRITE | MAY_EXEC)
  41 # error "please use a different value for MAY_SATTR or MAY_TRUNC or MAY_LOCK or MAY_LOCAL_ACCESS or MAY_OWNER_OVERRIDE."
  42 #endif
  43 #define MAY_CREATE              (MAY_EXEC|MAY_WRITE)
  44 #define MAY_REMOVE              (MAY_EXEC|MAY_WRITE|MAY_TRUNC)
  45
  46 /*
  47  * Callback function for readdir
  48  */
  49 struct readdir_cd {
  50         __be32                  err;    /* 0, nfserr, or nfserr_eof */
  51 };
  52 typedef int (*nfsd_dirop_t)(struct inode *, struct dentry *, int, int);
  53
  54 extern struct svc_program       nfsd_program;
  55 extern struct svc_version       nfsd_version2, nfsd_version3,
  56                                 nfsd_version4;
  57 extern struct svc_serv          *nfsd_serv;
  58
  59 extern struct seq_operations nfs_exports_op;
  60
  61 /*
  62  * Function prototypes.
  63  */
  64 int             nfsd_svc(unsigned short port, int nrservs);
  65 int             nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
  66
  67 int             nfsd_nrthreads(void);
  68 int             nfsd_nrpools(void);
  69 int             nfsd_get_nrthreads(int n, int *);
  70 int             nfsd_set_nrthreads(int n, int *);
  71
  72 /* nfsd/vfs.c */
  73 int             fh_lock_parent(struct svc_fh *, struct dentry *);
  74 int             nfsd_racache_init(int);
  75 void            nfsd_racache_shutdown(void);
  76 int             nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
  77                                 struct svc_export **expp);
  78 __be32          nfsd_lookup(struct svc_rqst *, struct svc_fh *,
  79                                 const char *, unsigned int, struct svc_fh *);
  80 __be32           nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
  81                                 const char *, unsigned int,
  82                                 struct svc_export **, struct dentry **);
  83 __be32          nfsd_setattr(struct svc_rqst *, struct svc_fh *,
  84                                 struct iattr *, int, time_t);
  85 #ifdef CONFIG_NFSD_V4
  86 __be32          nfsd4_set_nfs4_acl(struct svc_rqst *, struct svc_fh *,
  87                     struct nfs4_acl *);
  88 int             nfsd4_get_nfs4_acl(struct svc_rqst *, struct dentry *, struct nfs4_acl **);
  89 #endif /* CONFIG_NFSD_V4 */
  90 __be32          nfsd_create(struct svc_rqst *, struct svc_fh *,
  91                                 char *name, int len, struct iattr *attrs,
  92                                 int type, dev_t rdev, struct svc_fh *res);
  93 #ifdef CONFIG_NFSD_V3
  94 __be32          nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
  95 __be32          nfsd_create_v3(struct svc_rqst *, struct svc_fh *,
  96                                 char *name, int len, struct iattr *attrs,
  97                                 struct svc_fh *res, int createmode,
  98                                 u32 *verifier, int *truncp, int *created);
  99 __be32          nfsd_commit(struct svc_rqst *, struct svc_fh *,
 100                                 loff_t, unsigned long);
 101 #endif /* CONFIG_NFSD_V3 */
 102 __be32          nfsd_open(struct svc_rqst *, struct svc_fh *, int,
 103                                 int, struct file **);
 104 void            nfsd_close(struct file *);
 105 __be32          nfsd_read(struct svc_rqst *, struct svc_fh *, struct file *,
 106                                 loff_t, struct kvec *, int, unsigned long *);
 107 __be32          nfsd_write(struct svc_rqst *, struct svc_fh *,struct file *,
 108                                 loff_t, struct kvec *,int, unsigned long, int *);
 109 __be32          nfsd_readlink(struct svc_rqst *, struct svc_fh *,
 110                                 char *, int *);
 111 __be32          nfsd_symlink(struct svc_rqst *, struct svc_fh *,
 112                                 char *name, int len, char *path, int plen,
 113                                 struct svc_fh *res, struct iattr *);
 114 __be32          nfsd_link(struct svc_rqst *, struct svc_fh *,
 115                                 char *, int, struct svc_fh *);
 116 __be32          nfsd_rename(struct svc_rqst *,
 117                                 struct svc_fh *, char *, int,
 118                                 struct svc_fh *, char *, int);
 119 __be32          nfsd_remove(struct svc_rqst *,
 120                                 struct svc_fh *, char *, int);
 121 __be32          nfsd_unlink(struct svc_rqst *, struct svc_fh *, int type,
 122                                 char *name, int len);
 123 int             nfsd_truncate(struct svc_rqst *, struct svc_fh *,
 124                                 unsigned long size);
 125 __be32          nfsd_readdir(struct svc_rqst *, struct svc_fh *,
 126                              loff_t *, struct readdir_cd *, filldir_t);
 127 __be32          nfsd_statfs(struct svc_rqst *, struct svc_fh *,
 128                                 struct kstatfs *);
 129
 130 int             nfsd_notify_change(struct inode *, struct iattr *);
 131 __be32          nfsd_permission(struct svc_rqst *, struct svc_export *,
 132                                 struct dentry *, int);
 133 int             nfsd_sync_dir(struct dentry *dp);
 134
 135 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
 136 #ifdef CONFIG_NFSD_V2_ACL
 137 extern struct svc_version nfsd_acl_version2;
 138 #else
 139 #define nfsd_acl_version2 NULL
 140 #endif
 141 #ifdef CONFIG_NFSD_V3_ACL
 142 extern struct svc_version nfsd_acl_version3;
 143 #else
 144 #define nfsd_acl_version3 NULL
 145 #endif
 146 struct posix_acl *nfsd_get_posix_acl(struct svc_fh *, int);
 147 int nfsd_set_posix_acl(struct svc_fh *, int, struct posix_acl *);
 148 #endif
 149
 150 enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
 151 int nfsd_vers(int vers, enum vers_op change);
 152 void nfsd_reset_versions(void);
 153 int nfsd_create_serv(void);
 154
 155 extern int nfsd_max_blksize;
 156
 157 /*
 158  * NFSv4 State
 159  */
 160 #ifdef CONFIG_NFSD_V4
 161 extern unsigned int max_delegations;
 162 int nfs4_state_init(void);
 163 void nfsd4_free_slabs(void);
 164 void nfs4_state_start(void);
 165 void nfs4_state_shutdown(void);
 166 time_t nfs4_lease_time(void);
 167 void nfs4_reset_lease(time_t leasetime);
 168 int nfs4_reset_recoverydir(char *recdir);
 169 #else
 170 static inline int nfs4_state_init(void) { return 0; }
 171 static inline void nfsd4_free_slabs(void) { }
 172 static inline void nfs4_state_start(void) { }
 173 static inline void nfs4_state_shutdown(void) { }
 174 static inline time_t nfs4_lease_time(void) { return 0; }
 175 static inline void nfs4_reset_lease(time_t leasetime) { }
 176 static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
 177 #endif
 178
 179 /*
 180  * lockd binding
 181  */
 182 void            nfsd_lockd_init(void);
 183 void            nfsd_lockd_shutdown(void);
 184
 185
 186 /*
 187  * These macros provide pre-xdr'ed values for faster operation.
 188  */
 189 #define nfs_ok                  __constant_htonl(NFS_OK)
 190 #define nfserr_perm             __constant_htonl(NFSERR_PERM)
 191 #define nfserr_noent            __constant_htonl(NFSERR_NOENT)
 192 #define nfserr_io               __constant_htonl(NFSERR_IO)
 193 #define nfserr_nxio             __constant_htonl(NFSERR_NXIO)
 194 #define nfserr_eagain           __constant_htonl(NFSERR_EAGAIN)
 195 #define nfserr_acces            __constant_htonl(NFSERR_ACCES)
 196 #define nfserr_exist            __constant_htonl(NFSERR_EXIST)
 197 #define nfserr_xdev             __constant_htonl(NFSERR_XDEV)
 198 #define nfserr_nodev            __constant_htonl(NFSERR_NODEV)
 199 #define nfserr_notdir           __constant_htonl(NFSERR_NOTDIR)
 200 #define nfserr_isdir            __constant_htonl(NFSERR_ISDIR)
 201 #define nfserr_inval            __constant_htonl(NFSERR_INVAL)
 202 #define nfserr_fbig             __constant_htonl(NFSERR_FBIG)
 203 #define nfserr_nospc            __constant_htonl(NFSERR_NOSPC)
 204 #define nfserr_rofs             __constant_htonl(NFSERR_ROFS)
 205 #define nfserr_mlink            __constant_htonl(NFSERR_MLINK)
 206 #define nfserr_opnotsupp        __constant_htonl(NFSERR_OPNOTSUPP)
 207 #define nfserr_nametoolong      __constant_htonl(NFSERR_NAMETOOLONG)
 208 #define nfserr_notempty         __constant_htonl(NFSERR_NOTEMPTY)
 209 #define nfserr_dquot            __constant_htonl(NFSERR_DQUOT)
 210 #define nfserr_stale            __constant_htonl(NFSERR_STALE)
 211 #define nfserr_remote           __constant_htonl(NFSERR_REMOTE)
 212 #define nfserr_wflush           __constant_htonl(NFSERR_WFLUSH)
 213 #define nfserr_badhandle        __constant_htonl(NFSERR_BADHANDLE)
 214 #define nfserr_notsync          __constant_htonl(NFSERR_NOT_SYNC)
 215 #define nfserr_badcookie        __constant_htonl(NFSERR_BAD_COOKIE)
 216 #define nfserr_notsupp          __constant_htonl(NFSERR_NOTSUPP)
 217 #define nfserr_toosmall         __constant_htonl(NFSERR_TOOSMALL)
 218 #define nfserr_serverfault      __constant_htonl(NFSERR_SERVERFAULT)
 219 #define nfserr_badtype          __constant_htonl(NFSERR_BADTYPE)
 220 #define nfserr_jukebox          __constant_htonl(NFSERR_JUKEBOX)
 221 #define nfserr_denied           __constant_htonl(NFSERR_DENIED)
 222 #define nfserr_deadlock         __constant_htonl(NFSERR_DEADLOCK)
 223 #define nfserr_expired          __constant_htonl(NFSERR_EXPIRED)
 224 #define nfserr_bad_cookie       __constant_htonl(NFSERR_BAD_COOKIE)
 225 #define nfserr_same             __constant_htonl(NFSERR_SAME)
 226 #define nfserr_clid_inuse       __constant_htonl(NFSERR_CLID_INUSE)
 227 #define nfserr_stale_clientid   __constant_htonl(NFSERR_STALE_CLIENTID)
 228 #define nfserr_resource         __constant_htonl(NFSERR_RESOURCE)
 229 #define nfserr_moved            __constant_htonl(NFSERR_MOVED)
 230 #define nfserr_nofilehandle     __constant_htonl(NFSERR_NOFILEHANDLE)
 231 #define nfserr_minor_vers_mismatch      __constant_htonl(NFSERR_MINOR_VERS_MISMATCH)
 232 #define nfserr_share_denied     __constant_htonl(NFSERR_SHARE_DENIED)
 233 #define nfserr_stale_stateid    __constant_htonl(NFSERR_STALE_STATEID)
 234 #define nfserr_old_stateid      __constant_htonl(NFSERR_OLD_STATEID)
 235 #define nfserr_bad_stateid      __constant_htonl(NFSERR_BAD_STATEID)
 236 #define nfserr_bad_seqid        __constant_htonl(NFSERR_BAD_SEQID)
 237 #define nfserr_symlink          __constant_htonl(NFSERR_SYMLINK)
 238 #define nfserr_not_same         __constant_htonl(NFSERR_NOT_SAME)
 239 #define nfserr_restorefh        __constant_htonl(NFSERR_RESTOREFH)
 240 #define nfserr_attrnotsupp      __constant_htonl(NFSERR_ATTRNOTSUPP)
 241 #define nfserr_bad_xdr          __constant_htonl(NFSERR_BAD_XDR)
 242 #define nfserr_openmode         __constant_htonl(NFSERR_OPENMODE)
 243 #define nfserr_locks_held       __constant_htonl(NFSERR_LOCKS_HELD)
 244 #define nfserr_op_illegal       __constant_htonl(NFSERR_OP_ILLEGAL)
 245 #define nfserr_grace            __constant_htonl(NFSERR_GRACE)
 246 #define nfserr_no_grace         __constant_htonl(NFSERR_NO_GRACE)
 247 #define nfserr_reclaim_bad      __constant_htonl(NFSERR_RECLAIM_BAD)
 248 #define nfserr_badname          __constant_htonl(NFSERR_BADNAME)
 249 #define nfserr_cb_path_down     __constant_htonl(NFSERR_CB_PATH_DOWN)
 250 #define nfserr_locked           __constant_htonl(NFSERR_LOCKED)
 251 #define nfserr_wrongsec         __constant_htonl(NFSERR_WRONGSEC)
 252 #define nfserr_replay_me        __constant_htonl(NFSERR_REPLAY_ME)
 253
 254 /* error codes for internal use */
 255 /* if a request fails due to kmalloc failure, it gets dropped.
 256  *  Client should resend eventually
 257  */
 258 #define nfserr_dropit           __constant_htonl(30000)
 259 /* end-of-file indicator in readdir */
 260 #define nfserr_eof              __constant_htonl(30001)
 261
 262 /* Check for dir entries '.' and '..' */
 263 #define isdotent(n, l)  (l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
 264
 265 /*
 266  * Time of server startup
 267  */
 268 extern struct timeval   nfssvc_boot;
 269
 270 #ifdef CONFIG_NFSD_V4
 271
 272 /* before processing a COMPOUND operation, we have to check that there
 273  * is enough space in the buffer for XDR encode to succeed.  otherwise,
 274  * we might process an operation with side effects, and be unable to
 275  * tell the client that the operation succeeded.
 276  *
 277  * COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
 278  * needed to encode an "ordinary" _successful_ operation.  (GETATTR,
 279  * READ, READDIR, and READLINK have their own buffer checks.)  if we
 280  * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
 281  *
 282  * COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
 283  * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
 284  * care is taken to ensure that we never fall below this level for any
 285  * reason.
 286  */
 287 #define COMPOUND_SLACK_SPACE            140    /* OP_GETFH */
 288 #define COMPOUND_ERR_SLACK_SPACE        12     /* OP_SETATTR */
 289
 290 #define NFSD_LEASE_TIME                 (nfs4_lease_time())
 291 #define NFSD_LAUNDROMAT_MINTIMEOUT      10   /* seconds */
 292
 293 /*
 294  * The following attributes are currently not supported by the NFSv4 server:
 295  *    ARCHIVE       (deprecated anyway)
 296  *    HIDDEN        (unlikely to be supported any time soon)
 297  *    MIMETYPE      (unlikely to be supported any time soon)
 298  *    QUOTA_*       (will be supported in a forthcoming patch)
 299  *    SYSTEM        (unlikely to be supported any time soon)
 300  *    TIME_BACKUP   (unlikely to be supported any time soon)
 301  *    TIME_CREATE   (unlikely to be supported any time soon)
 302  */
 303 #define NFSD_SUPPORTED_ATTRS_WORD0                                                          \
 304 (FATTR4_WORD0_SUPPORTED_ATTRS   | FATTR4_WORD0_TYPE         | FATTR4_WORD0_FH_EXPIRE_TYPE   \
 305  | FATTR4_WORD0_CHANGE          | FATTR4_WORD0_SIZE         | FATTR4_WORD0_LINK_SUPPORT     \
 306  | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR   | FATTR4_WORD0_FSID             \
 307  | FATTR4_WORD0_UNIQUE_HANDLES  | FATTR4_WORD0_LEASE_TIME   | FATTR4_WORD0_RDATTR_ERROR     \
 308  | FATTR4_WORD0_ACLSUPPORT      | FATTR4_WORD0_CANSETTIME   | FATTR4_WORD0_CASE_INSENSITIVE \
 309  | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED                             \
 310  | FATTR4_WORD0_FILEHANDLE      | FATTR4_WORD0_FILEID       | FATTR4_WORD0_FILES_AVAIL      \
 311  | FATTR4_WORD0_FILES_FREE      | FATTR4_WORD0_FILES_TOTAL  | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS      \
 312  | FATTR4_WORD0_MAXFILESIZE     | FATTR4_WORD0_MAXLINK      | FATTR4_WORD0_MAXNAME          \
 313  | FATTR4_WORD0_MAXREAD         | FATTR4_WORD0_MAXWRITE     | FATTR4_WORD0_ACL)
 314
 315 #define NFSD_SUPPORTED_ATTRS_WORD1                                                          \
 316 (FATTR4_WORD1_MODE              | FATTR4_WORD1_NO_TRUNC     | FATTR4_WORD1_NUMLINKS         \
 317  | FATTR4_WORD1_OWNER           | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
 318  | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
 319  | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
 320  | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
 321  | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
 322
 323 /* These will return ERR_INVAL if specified in GETATTR or READDIR. */
 324 #define NFSD_WRITEONLY_ATTRS_WORD1                                                          \
 325 (FATTR4_WORD1_TIME_ACCESS_SET   | FATTR4_WORD1_TIME_MODIFY_SET)
 326
 327 /* These are the only attrs allowed in CREATE/OPEN/SETATTR. */
 328 #define NFSD_WRITEABLE_ATTRS_WORD0                                                          \
 329 (FATTR4_WORD0_SIZE              | FATTR4_WORD0_ACL                                         )
 330 #define NFSD_WRITEABLE_ATTRS_WORD1                                                          \
 331 (FATTR4_WORD1_MODE              | FATTR4_WORD1_OWNER         | FATTR4_WORD1_OWNER_GROUP     \
 332  | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
 333
 334 #endif /* CONFIG_NFSD_V4 */
 335
 336 #endif /* LINUX_NFSD_NFSD_H */