fs/nfsd/nfsd.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Hodge-podge collection of knfsd-related stuff.
   4  * I will sort this out later.
   5  *
   6  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #ifndef LINUX_NFSD_NFSD_H
  10 #define LINUX_NFSD_NFSD_H
  11
  12 #include <linux/types.h>
  13 #include <linux/mount.h>
  14
  15 #include <linux/nfs.h>
  16 #include <linux/nfs2.h>
  17 #include <linux/nfs3.h>
  18 #include <linux/nfs4.h>
  19 #include <linux/sunrpc/svc.h>
  20 #include <linux/sunrpc/svc_xprt.h>
  21 #include <linux/sunrpc/msg_prot.h>
  22
  23 #include <uapi/linux/nfsd/debug.h>
  24
  25 #include "stats.h"
  26 #include "export.h"
  27
  28 #undef ifdebug
  29 #ifdef CONFIG_SUNRPC_DEBUG
  30 # define ifdebug(flag)          if (nfsd_debug & NFSDDBG_##flag)
  31 #else
  32 # define ifdebug(flag)          if (0)
  33 #endif
  34
  35 /*
  36  * nfsd version
  37  */
  38 #define NFSD_SUPPORTED_MINOR_VERSION    2
  39 /*
  40  * Maximum blocksizes supported by daemon under various circumstances.
  41  */
  42 #define NFSSVC_MAXBLKSIZE       RPCSVC_MAXPAYLOAD
  43 /* NFSv2 is limited by the protocol specification, see RFC 1094 */
  44 #define NFSSVC_MAXBLKSIZE_V2    (8*1024)
  45
  46
  47 /*
  48  * Largest number of bytes we need to allocate for an NFS
  49  * call or reply.  Used to control buffer sizes.  We use
  50  * the length of v3 WRITE, READDIR and READDIR replies
  51  * which are an RPC header, up to 26 XDR units of reply
  52  * data, and some page data.
  53  *
  54  * Note that accuracy here doesn't matter too much as the
  55  * size is rounded up to a page size when allocating space.
  56  */
  57 #define NFSD_BUFSIZE            ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)
  58
  59 struct readdir_cd {
  60         __be32                  err;    /* 0, nfserr, or nfserr_eof */
  61 };
  62
  63
  64 extern struct svc_program       nfsd_program;
  65 extern const struct svc_version nfsd_version2, nfsd_version3,
  66                                 nfsd_version4;
  67 extern struct mutex             nfsd_mutex;
  68 extern spinlock_t               nfsd_drc_lock;
  69 extern unsigned long            nfsd_drc_max_mem;
  70 extern unsigned long            nfsd_drc_mem_used;
  71
  72 extern const struct seq_operations nfs_exports_op;
  73
  74 /*
  75  * Function prototypes.
  76  */
  77 int             nfsd_svc(int nrservs, struct net *net, const struct cred *cred);
  78 int             nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
  79
  80 int             nfsd_nrthreads(struct net *);
  81 int             nfsd_nrpools(struct net *);
  82 int             nfsd_get_nrthreads(int n, int *, struct net *);
  83 int             nfsd_set_nrthreads(int n, int *, struct net *);
  84 int             nfsd_pool_stats_open(struct inode *, struct file *);
  85 int             nfsd_pool_stats_release(struct inode *, struct file *);
  86
  87 void            nfsd_destroy(struct net *net);
  88
  89 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
  90 #ifdef CONFIG_NFSD_V2_ACL
  91 extern const struct svc_version nfsd_acl_version2;
  92 #else
  93 #define nfsd_acl_version2 NULL
  94 #endif
  95 #ifdef CONFIG_NFSD_V3_ACL
  96 extern const struct svc_version nfsd_acl_version3;
  97 #else
  98 #define nfsd_acl_version3 NULL
  99 #endif
 100 #endif
 101
 102 struct nfsd_net;
 103
 104 enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
 105 int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change);
 106 int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change);
 107 void nfsd_reset_versions(struct nfsd_net *nn);
 108 int nfsd_create_serv(struct net *net);
 109
 110 extern int nfsd_max_blksize;
 111
 112 static inline int nfsd_v4client(struct svc_rqst *rq)
 113 {
 114         return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
 115 }
 116 static inline struct user_namespace *
 117 nfsd_user_namespace(const struct svc_rqst *rqstp)
 118 {
 119         const struct cred *cred = rqstp->rq_xprt->xpt_cred;
 120         return cred ? cred->user_ns : &init_user_ns;
 121 }
 122
 123 /*
 124  * NFSv4 State
 125  */
 126 #ifdef CONFIG_NFSD_V4
 127 extern unsigned long max_delegations;
 128 int nfsd4_init_slabs(void);
 129 void nfsd4_free_slabs(void);
 130 int nfs4_state_start(void);
 131 int nfs4_state_start_net(struct net *net);
 132 void nfs4_state_shutdown(void);
 133 void nfs4_state_shutdown_net(struct net *net);
 134 void nfs4_reset_lease(time_t leasetime);
 135 int nfs4_reset_recoverydir(char *recdir);
 136 char * nfs4_recoverydir(void);
 137 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp);
 138 #else
 139 static inline int nfsd4_init_slabs(void) { return 0; }
 140 static inline void nfsd4_free_slabs(void) { }
 141 static inline int nfs4_state_start(void) { return 0; }
 142 static inline int nfs4_state_start_net(struct net *net) { return 0; }
 143 static inline void nfs4_state_shutdown(void) { }
 144 static inline void nfs4_state_shutdown_net(struct net *net) { }
 145 static inline void nfs4_reset_lease(time_t leasetime) { }
 146 static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
 147 static inline char * nfs4_recoverydir(void) {return NULL; }
 148 static inline bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
 149 {
 150         return false;
 151 }
 152 #endif
 153
 154 /*
 155  * lockd binding
 156  */
 157 void            nfsd_lockd_init(void);
 158 void            nfsd_lockd_shutdown(void);
 159
 160
 161 /*
 162  * These macros provide pre-xdr'ed values for faster operation.
 163  */
 164 #define nfs_ok                  cpu_to_be32(NFS_OK)
 165 #define nfserr_perm             cpu_to_be32(NFSERR_PERM)
 166 #define nfserr_noent            cpu_to_be32(NFSERR_NOENT)
 167 #define nfserr_io               cpu_to_be32(NFSERR_IO)
 168 #define nfserr_nxio             cpu_to_be32(NFSERR_NXIO)
 169 #define nfserr_eagain           cpu_to_be32(NFSERR_EAGAIN)
 170 #define nfserr_acces            cpu_to_be32(NFSERR_ACCES)
 171 #define nfserr_exist            cpu_to_be32(NFSERR_EXIST)
 172 #define nfserr_xdev             cpu_to_be32(NFSERR_XDEV)
 173 #define nfserr_nodev            cpu_to_be32(NFSERR_NODEV)
 174 #define nfserr_notdir           cpu_to_be32(NFSERR_NOTDIR)
 175 #define nfserr_isdir            cpu_to_be32(NFSERR_ISDIR)
 176 #define nfserr_inval            cpu_to_be32(NFSERR_INVAL)
 177 #define nfserr_fbig             cpu_to_be32(NFSERR_FBIG)
 178 #define nfserr_nospc            cpu_to_be32(NFSERR_NOSPC)
 179 #define nfserr_rofs             cpu_to_be32(NFSERR_ROFS)
 180 #define nfserr_mlink            cpu_to_be32(NFSERR_MLINK)
 181 #define nfserr_opnotsupp        cpu_to_be32(NFSERR_OPNOTSUPP)
 182 #define nfserr_nametoolong      cpu_to_be32(NFSERR_NAMETOOLONG)
 183 #define nfserr_notempty         cpu_to_be32(NFSERR_NOTEMPTY)
 184 #define nfserr_dquot            cpu_to_be32(NFSERR_DQUOT)
 185 #define nfserr_stale            cpu_to_be32(NFSERR_STALE)
 186 #define nfserr_remote           cpu_to_be32(NFSERR_REMOTE)
 187 #define nfserr_wflush           cpu_to_be32(NFSERR_WFLUSH)
 188 #define nfserr_badhandle        cpu_to_be32(NFSERR_BADHANDLE)
 189 #define nfserr_notsync          cpu_to_be32(NFSERR_NOT_SYNC)
 190 #define nfserr_badcookie        cpu_to_be32(NFSERR_BAD_COOKIE)
 191 #define nfserr_notsupp          cpu_to_be32(NFSERR_NOTSUPP)
 192 #define nfserr_toosmall         cpu_to_be32(NFSERR_TOOSMALL)
 193 #define nfserr_serverfault      cpu_to_be32(NFSERR_SERVERFAULT)
 194 #define nfserr_badtype          cpu_to_be32(NFSERR_BADTYPE)
 195 #define nfserr_jukebox          cpu_to_be32(NFSERR_JUKEBOX)
 196 #define nfserr_denied           cpu_to_be32(NFSERR_DENIED)
 197 #define nfserr_deadlock         cpu_to_be32(NFSERR_DEADLOCK)
 198 #define nfserr_expired          cpu_to_be32(NFSERR_EXPIRED)
 199 #define nfserr_bad_cookie       cpu_to_be32(NFSERR_BAD_COOKIE)
 200 #define nfserr_same             cpu_to_be32(NFSERR_SAME)
 201 #define nfserr_clid_inuse       cpu_to_be32(NFSERR_CLID_INUSE)
 202 #define nfserr_stale_clientid   cpu_to_be32(NFSERR_STALE_CLIENTID)
 203 #define nfserr_resource         cpu_to_be32(NFSERR_RESOURCE)
 204 #define nfserr_moved            cpu_to_be32(NFSERR_MOVED)
 205 #define nfserr_nofilehandle     cpu_to_be32(NFSERR_NOFILEHANDLE)
 206 #define nfserr_minor_vers_mismatch      cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
 207 #define nfserr_share_denied     cpu_to_be32(NFSERR_SHARE_DENIED)
 208 #define nfserr_stale_stateid    cpu_to_be32(NFSERR_STALE_STATEID)
 209 #define nfserr_old_stateid      cpu_to_be32(NFSERR_OLD_STATEID)
 210 #define nfserr_bad_stateid      cpu_to_be32(NFSERR_BAD_STATEID)
 211 #define nfserr_bad_seqid        cpu_to_be32(NFSERR_BAD_SEQID)
 212 #define nfserr_symlink          cpu_to_be32(NFSERR_SYMLINK)
 213 #define nfserr_not_same         cpu_to_be32(NFSERR_NOT_SAME)
 214 #define nfserr_lock_range       cpu_to_be32(NFSERR_LOCK_RANGE)
 215 #define nfserr_restorefh        cpu_to_be32(NFSERR_RESTOREFH)
 216 #define nfserr_attrnotsupp      cpu_to_be32(NFSERR_ATTRNOTSUPP)
 217 #define nfserr_bad_xdr          cpu_to_be32(NFSERR_BAD_XDR)
 218 #define nfserr_openmode         cpu_to_be32(NFSERR_OPENMODE)
 219 #define nfserr_badowner         cpu_to_be32(NFSERR_BADOWNER)
 220 #define nfserr_locks_held       cpu_to_be32(NFSERR_LOCKS_HELD)
 221 #define nfserr_op_illegal       cpu_to_be32(NFSERR_OP_ILLEGAL)
 222 #define nfserr_grace            cpu_to_be32(NFSERR_GRACE)
 223 #define nfserr_no_grace         cpu_to_be32(NFSERR_NO_GRACE)
 224 #define nfserr_reclaim_bad      cpu_to_be32(NFSERR_RECLAIM_BAD)
 225 #define nfserr_badname          cpu_to_be32(NFSERR_BADNAME)
 226 #define nfserr_cb_path_down     cpu_to_be32(NFSERR_CB_PATH_DOWN)
 227 #define nfserr_locked           cpu_to_be32(NFSERR_LOCKED)
 228 #define nfserr_wrongsec         cpu_to_be32(NFSERR_WRONGSEC)
 229 #define nfserr_badiomode                cpu_to_be32(NFS4ERR_BADIOMODE)
 230 #define nfserr_badlayout                cpu_to_be32(NFS4ERR_BADLAYOUT)
 231 #define nfserr_bad_session_digest       cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
 232 #define nfserr_badsession               cpu_to_be32(NFS4ERR_BADSESSION)
 233 #define nfserr_badslot                  cpu_to_be32(NFS4ERR_BADSLOT)
 234 #define nfserr_complete_already         cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
 235 #define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
 236 #define nfserr_deleg_already_wanted     cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
 237 #define nfserr_back_chan_busy           cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
 238 #define nfserr_layouttrylater           cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
 239 #define nfserr_layoutunavailable        cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
 240 #define nfserr_nomatching_layout        cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
 241 #define nfserr_recallconflict           cpu_to_be32(NFS4ERR_RECALLCONFLICT)
 242 #define nfserr_unknown_layouttype       cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
 243 #define nfserr_seq_misordered           cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
 244 #define nfserr_sequence_pos             cpu_to_be32(NFS4ERR_SEQUENCE_POS)
 245 #define nfserr_req_too_big              cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
 246 #define nfserr_rep_too_big              cpu_to_be32(NFS4ERR_REP_TOO_BIG)
 247 #define nfserr_rep_too_big_to_cache     cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
 248 #define nfserr_retry_uncached_rep       cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
 249 #define nfserr_unsafe_compound          cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
 250 #define nfserr_too_many_ops             cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
 251 #define nfserr_op_not_in_session        cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
 252 #define nfserr_hash_alg_unsupp          cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
 253 #define nfserr_clientid_busy            cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
 254 #define nfserr_pnfs_io_hole             cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
 255 #define nfserr_seq_false_retry          cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
 256 #define nfserr_bad_high_slot            cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
 257 #define nfserr_deadsession              cpu_to_be32(NFS4ERR_DEADSESSION)
 258 #define nfserr_encr_alg_unsupp          cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
 259 #define nfserr_pnfs_no_layout           cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
 260 #define nfserr_not_only_op              cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
 261 #define nfserr_wrong_cred               cpu_to_be32(NFS4ERR_WRONG_CRED)
 262 #define nfserr_wrong_type               cpu_to_be32(NFS4ERR_WRONG_TYPE)
 263 #define nfserr_dirdeleg_unavail         cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
 264 #define nfserr_reject_deleg             cpu_to_be32(NFS4ERR_REJECT_DELEG)
 265 #define nfserr_returnconflict           cpu_to_be32(NFS4ERR_RETURNCONFLICT)
 266 #define nfserr_deleg_revoked            cpu_to_be32(NFS4ERR_DELEG_REVOKED)
 267 #define nfserr_partner_notsupp          cpu_to_be32(NFS4ERR_PARTNER_NOTSUPP)
 268 #define nfserr_partner_no_auth          cpu_to_be32(NFS4ERR_PARTNER_NO_AUTH)
 269 #define nfserr_union_notsupp            cpu_to_be32(NFS4ERR_UNION_NOTSUPP)
 270 #define nfserr_offload_denied           cpu_to_be32(NFS4ERR_OFFLOAD_DENIED)
 271 #define nfserr_wrong_lfs                cpu_to_be32(NFS4ERR_WRONG_LFS)
 272 #define nfserr_badlabel         cpu_to_be32(NFS4ERR_BADLABEL)
 273
 274 /* error codes for internal use */
 275 /* if a request fails due to kmalloc failure, it gets dropped.
 276  *  Client should resend eventually
 277  */
 278 #define nfserr_dropit           cpu_to_be32(30000)
 279 /* end-of-file indicator in readdir */
 280 #define nfserr_eof              cpu_to_be32(30001)
 281 /* replay detected */
 282 #define nfserr_replay_me        cpu_to_be32(11001)
 283 /* nfs41 replay detected */
 284 #define nfserr_replay_cache     cpu_to_be32(11002)
 285
 286 /* Check for dir entries '.' and '..' */
 287 #define isdotent(n, l)  (l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
 288
 289 #ifdef CONFIG_NFSD_V4
 290
 291 /* before processing a COMPOUND operation, we have to check that there
 292  * is enough space in the buffer for XDR encode to succeed.  otherwise,
 293  * we might process an operation with side effects, and be unable to
 294  * tell the client that the operation succeeded.
 295  *
 296  * COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
 297  * needed to encode an "ordinary" _successful_ operation.  (GETATTR,
 298  * READ, READDIR, and READLINK have their own buffer checks.)  if we
 299  * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
 300  *
 301  * COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
 302  * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
 303  * care is taken to ensure that we never fall below this level for any
 304  * reason.
 305  */
 306 #define COMPOUND_SLACK_SPACE            140    /* OP_GETFH */
 307 #define COMPOUND_ERR_SLACK_SPACE        16     /* OP_SETATTR */
 308
 309 #define NFSD_LAUNDROMAT_MINTIMEOUT      1   /* seconds */
 310
 311 /*
 312  * The following attributes are currently not supported by the NFSv4 server:
 313  *    ARCHIVE       (deprecated anyway)
 314  *    HIDDEN        (unlikely to be supported any time soon)
 315  *    MIMETYPE      (unlikely to be supported any time soon)
 316  *    QUOTA_*       (will be supported in a forthcoming patch)
 317  *    SYSTEM        (unlikely to be supported any time soon)
 318  *    TIME_BACKUP   (unlikely to be supported any time soon)
 319  *    TIME_CREATE   (unlikely to be supported any time soon)
 320  */
 321 #define NFSD4_SUPPORTED_ATTRS_WORD0                                                         \
 322 (FATTR4_WORD0_SUPPORTED_ATTRS   | FATTR4_WORD0_TYPE         | FATTR4_WORD0_FH_EXPIRE_TYPE   \
 323  | FATTR4_WORD0_CHANGE          | FATTR4_WORD0_SIZE         | FATTR4_WORD0_LINK_SUPPORT     \
 324  | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR   | FATTR4_WORD0_FSID             \
 325  | FATTR4_WORD0_UNIQUE_HANDLES  | FATTR4_WORD0_LEASE_TIME   | FATTR4_WORD0_RDATTR_ERROR     \
 326  | FATTR4_WORD0_ACLSUPPORT      | FATTR4_WORD0_CANSETTIME   | FATTR4_WORD0_CASE_INSENSITIVE \
 327  | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED                             \
 328  | FATTR4_WORD0_FILEHANDLE      | FATTR4_WORD0_FILEID       | FATTR4_WORD0_FILES_AVAIL      \
 329  | FATTR4_WORD0_FILES_FREE      | FATTR4_WORD0_FILES_TOTAL  | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS      \
 330  | FATTR4_WORD0_MAXFILESIZE     | FATTR4_WORD0_MAXLINK      | FATTR4_WORD0_MAXNAME          \
 331  | FATTR4_WORD0_MAXREAD         | FATTR4_WORD0_MAXWRITE     | FATTR4_WORD0_ACL)
 332
 333 #define NFSD4_SUPPORTED_ATTRS_WORD1                                                         \
 334 (FATTR4_WORD1_MODE              | FATTR4_WORD1_NO_TRUNC     | FATTR4_WORD1_NUMLINKS         \
 335  | FATTR4_WORD1_OWNER           | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
 336  | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
 337  | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
 338  | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
 339  | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
 340
 341 #define NFSD4_SUPPORTED_ATTRS_WORD2 0
 342
 343 /* 4.1 */
 344 #ifdef CONFIG_NFSD_PNFS
 345 #define PNFSD_SUPPORTED_ATTRS_WORD1     FATTR4_WORD1_FS_LAYOUT_TYPES
 346 #define PNFSD_SUPPORTED_ATTRS_WORD2 \
 347 (FATTR4_WORD2_LAYOUT_BLKSIZE    | FATTR4_WORD2_LAYOUT_TYPES)
 348 #else
 349 #define PNFSD_SUPPORTED_ATTRS_WORD1     0
 350 #define PNFSD_SUPPORTED_ATTRS_WORD2     0
 351 #endif /* CONFIG_NFSD_PNFS */
 352
 353 #define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
 354         NFSD4_SUPPORTED_ATTRS_WORD0
 355
 356 #define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
 357         (NFSD4_SUPPORTED_ATTRS_WORD1    | PNFSD_SUPPORTED_ATTRS_WORD1)
 358
 359 #define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
 360         (NFSD4_SUPPORTED_ATTRS_WORD2    | PNFSD_SUPPORTED_ATTRS_WORD2 | \
 361          FATTR4_WORD2_SUPPATTR_EXCLCREAT)
 362
 363 /* 4.2 */
 364 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 365 #define NFSD4_2_SECURITY_ATTRS          FATTR4_WORD2_SECURITY_LABEL
 366 #else
 367 #define NFSD4_2_SECURITY_ATTRS          0
 368 #endif
 369
 370 #define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
 371         (NFSD4_1_SUPPORTED_ATTRS_WORD2 | \
 372         FATTR4_WORD2_CHANGE_ATTR_TYPE | \
 373         FATTR4_WORD2_MODE_UMASK | \
 374         NFSD4_2_SECURITY_ATTRS)
 375
 376 extern const u32 nfsd_suppattrs[3][3];
 377
 378 static inline bool bmval_is_subset(const u32 *bm1, const u32 *bm2)
 379 {
 380         return !((bm1[0] & ~bm2[0]) ||
 381                  (bm1[1] & ~bm2[1]) ||
 382                  (bm1[2] & ~bm2[2]));
 383 }
 384
 385 static inline bool nfsd_attrs_supported(u32 minorversion, const u32 *bmval)
 386 {
 387         return bmval_is_subset(bmval, nfsd_suppattrs[minorversion]);
 388 }
 389
 390 /* These will return ERR_INVAL if specified in GETATTR or READDIR. */
 391 #define NFSD_WRITEONLY_ATTRS_WORD1 \
 392         (FATTR4_WORD1_TIME_ACCESS_SET   | FATTR4_WORD1_TIME_MODIFY_SET)
 393
 394 /*
 395  * These are the only attrs allowed in CREATE/OPEN/SETATTR. Don't add
 396  * a writeable attribute here without also adding code to parse it to
 397  * nfsd4_decode_fattr().
 398  */
 399 #define NFSD_WRITEABLE_ATTRS_WORD0 \
 400         (FATTR4_WORD0_SIZE | FATTR4_WORD0_ACL)
 401 #define NFSD_WRITEABLE_ATTRS_WORD1 \
 402         (FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP \
 403         | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
 404 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 405 #define MAYBE_FATTR4_WORD2_SECURITY_LABEL \
 406         FATTR4_WORD2_SECURITY_LABEL
 407 #else
 408 #define MAYBE_FATTR4_WORD2_SECURITY_LABEL 0
 409 #endif
 410 #define NFSD_WRITEABLE_ATTRS_WORD2 \
 411         (FATTR4_WORD2_MODE_UMASK \
 412         | MAYBE_FATTR4_WORD2_SECURITY_LABEL)
 413
 414 #define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
 415         NFSD_WRITEABLE_ATTRS_WORD0
 416 /*
 417  * we currently store the exclusive create verifier in the v_{a,m}time
 418  * attributes so the client can't set these at create time using EXCLUSIVE4_1
 419  */
 420 #define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
 421         (NFSD_WRITEABLE_ATTRS_WORD1 & \
 422          ~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
 423 #define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
 424         NFSD_WRITEABLE_ATTRS_WORD2
 425
 426 extern int nfsd4_is_junction(struct dentry *dentry);
 427 extern int register_cld_notifier(void);
 428 extern void unregister_cld_notifier(void);
 429 #else /* CONFIG_NFSD_V4 */
 430 static inline int nfsd4_is_junction(struct dentry *dentry)
 431 {
 432         return 0;
 433 }
 434
 435 #define register_cld_notifier() 0
 436 #define unregister_cld_notifier() do { } while(0)
 437
 438 #endif /* CONFIG_NFSD_V4 */
 439
 440 #endif /* LINUX_NFSD_NFSD_H */