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