fs/nfsd/nfsd.h - kernel/msm-4.9 - Gitiles

 /*
  * Hodge-podge collection of knfsd-related stuff.
  * I will sort this out later.
  *
  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
  */

 #ifndef LINUX_NFSD_NFSD_H
 #define LINUX_NFSD_NFSD_H

 #include <linux/types.h>
 #include <linux/mount.h>

 #include <linux/nfs.h>
 #include <linux/nfs2.h>
 #include <linux/nfs3.h>
 #include <linux/nfs4.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/sunrpc/msg_prot.h>

 #include <linux/nfsd/debug.h>
 #include <linux/nfsd/stats.h>

 #include "export.h"

 /*
  * nfsd version
  */
 #define NFSD_SUPPORTED_MINOR_VERSION	2
 /*
  * Maximum blocksizes supported by daemon under various circumstances.
  */
 #define NFSSVC_MAXBLKSIZE       RPCSVC_MAXPAYLOAD
 /* NFSv2 is limited by the protocol specification, see RFC 1094 */
 #define NFSSVC_MAXBLKSIZE_V2    (8*1024)


 /*
  * Largest number of bytes we need to allocate for an NFS
  * call or reply.  Used to control buffer sizes.  We use
  * the length of v3 WRITE, READDIR and READDIR replies
  * which are an RPC header, up to 26 XDR units of reply
  * data, and some page data.
  *
  * Note that accuracy here doesn't matter too much as the
  * size is rounded up to a page size when allocating space.
  */
 #define NFSD_BUFSIZE            ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)

 struct readdir_cd {
 	__be32			err;	/* 0, nfserr, or nfserr_eof */
 };


 extern struct svc_program	nfsd_program;
 extern struct svc_version	nfsd_version2, nfsd_version3,
 				nfsd_version4;
 extern struct mutex		nfsd_mutex;
 extern spinlock_t		nfsd_drc_lock;
 extern unsigned long		nfsd_drc_max_mem;
 extern unsigned long		nfsd_drc_mem_used;

 extern const struct seq_operations nfs_exports_op;

 /*
  * Function prototypes.
  */
 int		nfsd_svc(int nrservs, struct net *net);
 int		nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);

 int		nfsd_nrthreads(struct net *);
 int		nfsd_nrpools(struct net *);
 int		nfsd_get_nrthreads(int n, int *, struct net *);
 int		nfsd_set_nrthreads(int n, int *, struct net *);
 int		nfsd_pool_stats_open(struct inode *, struct file *);
 int		nfsd_pool_stats_release(struct inode *, struct file *);

 void		nfsd_destroy(struct net *net);

 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
 #ifdef CONFIG_NFSD_V2_ACL
 extern struct svc_version nfsd_acl_version2;
 #else
 #define nfsd_acl_version2 NULL
 #endif
 #ifdef CONFIG_NFSD_V3_ACL
 extern struct svc_version nfsd_acl_version3;
 #else
 #define nfsd_acl_version3 NULL
 #endif
 #endif

 enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
 int nfsd_vers(int vers, enum vers_op change);
 int nfsd_minorversion(u32 minorversion, enum vers_op change);
 void nfsd_reset_versions(void);
 int nfsd_create_serv(struct net *net);

 extern int nfsd_max_blksize;

 static inline int nfsd_v4client(struct svc_rqst *rq)
 {
 	return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
 }

 /*
  * NFSv4 State
  */
 #ifdef CONFIG_NFSD_V4
 extern unsigned long max_delegations;
 void nfs4_state_init(void);
 int nfsd4_init_slabs(void);
 void nfsd4_free_slabs(void);
 int nfs4_state_start(void);
 int nfs4_state_start_net(struct net *net);
 void nfs4_state_shutdown(void);
 void nfs4_state_shutdown_net(struct net *net);
 void nfs4_reset_lease(time_t leasetime);
 int nfs4_reset_recoverydir(char *recdir);
 char * nfs4_recoverydir(void);
 #else
 static inline void nfs4_state_init(void) { }
 static inline int nfsd4_init_slabs(void) { return 0; }
 static inline void nfsd4_free_slabs(void) { }
 static inline int nfs4_state_start(void) { return 0; }
 static inline int nfs4_state_start_net(struct net *net) { return 0; }
 static inline void nfs4_state_shutdown(void) { }
 static inline void nfs4_state_shutdown_net(struct net *net) { }
 static inline void nfs4_reset_lease(time_t leasetime) { }
 static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
 static inline char * nfs4_recoverydir(void) {return NULL; }
 #endif

 /*
  * lockd binding
  */
 void		nfsd_lockd_init(void);
 void		nfsd_lockd_shutdown(void);


 /*
  * These macros provide pre-xdr'ed values for faster operation.
  */
 #define	nfs_ok			cpu_to_be32(NFS_OK)
 #define	nfserr_perm		cpu_to_be32(NFSERR_PERM)
 #define	nfserr_noent		cpu_to_be32(NFSERR_NOENT)
 #define	nfserr_io		cpu_to_be32(NFSERR_IO)
 #define	nfserr_nxio		cpu_to_be32(NFSERR_NXIO)
 #define	nfserr_eagain		cpu_to_be32(NFSERR_EAGAIN)
 #define	nfserr_acces		cpu_to_be32(NFSERR_ACCES)
 #define	nfserr_exist		cpu_to_be32(NFSERR_EXIST)
 #define	nfserr_xdev		cpu_to_be32(NFSERR_XDEV)
 #define	nfserr_nodev		cpu_to_be32(NFSERR_NODEV)
 #define	nfserr_notdir		cpu_to_be32(NFSERR_NOTDIR)
 #define	nfserr_isdir		cpu_to_be32(NFSERR_ISDIR)
 #define	nfserr_inval		cpu_to_be32(NFSERR_INVAL)
 #define	nfserr_fbig		cpu_to_be32(NFSERR_FBIG)
 #define	nfserr_nospc		cpu_to_be32(NFSERR_NOSPC)
 #define	nfserr_rofs		cpu_to_be32(NFSERR_ROFS)
 #define	nfserr_mlink		cpu_to_be32(NFSERR_MLINK)
 #define	nfserr_opnotsupp	cpu_to_be32(NFSERR_OPNOTSUPP)
 #define	nfserr_nametoolong	cpu_to_be32(NFSERR_NAMETOOLONG)
 #define	nfserr_notempty		cpu_to_be32(NFSERR_NOTEMPTY)
 #define	nfserr_dquot		cpu_to_be32(NFSERR_DQUOT)
 #define	nfserr_stale		cpu_to_be32(NFSERR_STALE)
 #define	nfserr_remote		cpu_to_be32(NFSERR_REMOTE)
 #define	nfserr_wflush		cpu_to_be32(NFSERR_WFLUSH)
 #define	nfserr_badhandle	cpu_to_be32(NFSERR_BADHANDLE)
 #define	nfserr_notsync		cpu_to_be32(NFSERR_NOT_SYNC)
 #define	nfserr_badcookie	cpu_to_be32(NFSERR_BAD_COOKIE)
 #define	nfserr_notsupp		cpu_to_be32(NFSERR_NOTSUPP)
 #define	nfserr_toosmall		cpu_to_be32(NFSERR_TOOSMALL)
 #define	nfserr_serverfault	cpu_to_be32(NFSERR_SERVERFAULT)
 #define	nfserr_badtype		cpu_to_be32(NFSERR_BADTYPE)
 #define	nfserr_jukebox		cpu_to_be32(NFSERR_JUKEBOX)
 #define	nfserr_denied		cpu_to_be32(NFSERR_DENIED)
 #define	nfserr_deadlock		cpu_to_be32(NFSERR_DEADLOCK)
 #define nfserr_expired          cpu_to_be32(NFSERR_EXPIRED)
 #define	nfserr_bad_cookie	cpu_to_be32(NFSERR_BAD_COOKIE)
 #define	nfserr_same		cpu_to_be32(NFSERR_SAME)
 #define	nfserr_clid_inuse	cpu_to_be32(NFSERR_CLID_INUSE)
 #define	nfserr_stale_clientid	cpu_to_be32(NFSERR_STALE_CLIENTID)
 #define	nfserr_resource		cpu_to_be32(NFSERR_RESOURCE)
 #define	nfserr_moved		cpu_to_be32(NFSERR_MOVED)
 #define	nfserr_nofilehandle	cpu_to_be32(NFSERR_NOFILEHANDLE)
 #define	nfserr_minor_vers_mismatch	cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
 #define nfserr_share_denied	cpu_to_be32(NFSERR_SHARE_DENIED)
 #define nfserr_stale_stateid	cpu_to_be32(NFSERR_STALE_STATEID)
 #define nfserr_old_stateid	cpu_to_be32(NFSERR_OLD_STATEID)
 #define nfserr_bad_stateid	cpu_to_be32(NFSERR_BAD_STATEID)
 #define nfserr_bad_seqid	cpu_to_be32(NFSERR_BAD_SEQID)
 #define	nfserr_symlink		cpu_to_be32(NFSERR_SYMLINK)
 #define	nfserr_not_same		cpu_to_be32(NFSERR_NOT_SAME)
 #define nfserr_lock_range	cpu_to_be32(NFSERR_LOCK_RANGE)
 #define	nfserr_restorefh	cpu_to_be32(NFSERR_RESTOREFH)
 #define	nfserr_attrnotsupp	cpu_to_be32(NFSERR_ATTRNOTSUPP)
 #define	nfserr_bad_xdr		cpu_to_be32(NFSERR_BAD_XDR)
 #define	nfserr_openmode		cpu_to_be32(NFSERR_OPENMODE)
 #define	nfserr_badowner		cpu_to_be32(NFSERR_BADOWNER)
 #define	nfserr_locks_held	cpu_to_be32(NFSERR_LOCKS_HELD)
 #define	nfserr_op_illegal	cpu_to_be32(NFSERR_OP_ILLEGAL)
 #define	nfserr_grace		cpu_to_be32(NFSERR_GRACE)
 #define	nfserr_no_grace		cpu_to_be32(NFSERR_NO_GRACE)
 #define	nfserr_reclaim_bad	cpu_to_be32(NFSERR_RECLAIM_BAD)
 #define	nfserr_badname		cpu_to_be32(NFSERR_BADNAME)
 #define	nfserr_cb_path_down	cpu_to_be32(NFSERR_CB_PATH_DOWN)
 #define	nfserr_locked		cpu_to_be32(NFSERR_LOCKED)
 #define	nfserr_wrongsec		cpu_to_be32(NFSERR_WRONGSEC)
 #define nfserr_badiomode		cpu_to_be32(NFS4ERR_BADIOMODE)
 #define nfserr_badlayout		cpu_to_be32(NFS4ERR_BADLAYOUT)
 #define nfserr_bad_session_digest	cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
 #define nfserr_badsession		cpu_to_be32(NFS4ERR_BADSESSION)
 #define nfserr_badslot			cpu_to_be32(NFS4ERR_BADSLOT)
 #define nfserr_complete_already		cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
 #define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
 #define nfserr_deleg_already_wanted	cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
 #define nfserr_back_chan_busy		cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
 #define nfserr_layouttrylater		cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
 #define nfserr_layoutunavailable	cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
 #define nfserr_nomatching_layout	cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
 #define nfserr_recallconflict		cpu_to_be32(NFS4ERR_RECALLCONFLICT)
 #define nfserr_unknown_layouttype	cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
 #define nfserr_seq_misordered		cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
 #define nfserr_sequence_pos		cpu_to_be32(NFS4ERR_SEQUENCE_POS)
 #define nfserr_req_too_big		cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
 #define nfserr_rep_too_big		cpu_to_be32(NFS4ERR_REP_TOO_BIG)
 #define nfserr_rep_too_big_to_cache	cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
 #define nfserr_retry_uncached_rep	cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
 #define nfserr_unsafe_compound		cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
 #define nfserr_too_many_ops		cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
 #define nfserr_op_not_in_session	cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
 #define nfserr_hash_alg_unsupp		cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
 #define nfserr_clientid_busy		cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
 #define nfserr_pnfs_io_hole		cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
 #define nfserr_seq_false_retry		cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
 #define nfserr_bad_high_slot		cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
 #define nfserr_deadsession		cpu_to_be32(NFS4ERR_DEADSESSION)
 #define nfserr_encr_alg_unsupp		cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
 #define nfserr_pnfs_no_layout		cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
 #define nfserr_not_only_op		cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
 #define nfserr_wrong_cred		cpu_to_be32(NFS4ERR_WRONG_CRED)
 #define nfserr_wrong_type		cpu_to_be32(NFS4ERR_WRONG_TYPE)
 #define nfserr_dirdeleg_unavail		cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
 #define nfserr_reject_deleg		cpu_to_be32(NFS4ERR_REJECT_DELEG)
 #define nfserr_returnconflict		cpu_to_be32(NFS4ERR_RETURNCONFLICT)
 #define nfserr_deleg_revoked		cpu_to_be32(NFS4ERR_DELEG_REVOKED)
 #define nfserr_partner_notsupp		cpu_to_be32(NFS4ERR_PARTNER_NOTSUPP)
 #define nfserr_partner_no_auth		cpu_to_be32(NFS4ERR_PARTNER_NO_AUTH)
 #define nfserr_metadata_notsupp		cpu_to_be32(NFS4ERR_METADATA_NOTSUPP)
 #define nfserr_offload_denied		cpu_to_be32(NFS4ERR_OFFLOAD_DENIED)
 #define nfserr_wrong_lfs		cpu_to_be32(NFS4ERR_WRONG_LFS)
 #define nfserr_badlabel		cpu_to_be32(NFS4ERR_BADLABEL)

 /* error codes for internal use */
 /* if a request fails due to kmalloc failure, it gets dropped.
  *  Client should resend eventually
  */
 #define	nfserr_dropit		cpu_to_be32(30000)
 /* end-of-file indicator in readdir */
 #define	nfserr_eof		cpu_to_be32(30001)
 /* replay detected */
 #define	nfserr_replay_me	cpu_to_be32(11001)
 /* nfs41 replay detected */
 #define	nfserr_replay_cache	cpu_to_be32(11002)

 /* Check for dir entries '.' and '..' */
 #define isdotent(n, l)	(l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))

 #ifdef CONFIG_NFSD_V4

 /* before processing a COMPOUND operation, we have to check that there
  * is enough space in the buffer for XDR encode to succeed.  otherwise,
  * we might process an operation with side effects, and be unable to
  * tell the client that the operation succeeded.
  *
  * COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
  * needed to encode an "ordinary" _successful_ operation.  (GETATTR,
  * READ, READDIR, and READLINK have their own buffer checks.)  if we
  * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
  *
  * COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
  * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
  * care is taken to ensure that we never fall below this level for any
  * reason.
  */
 #define	COMPOUND_SLACK_SPACE		140    /* OP_GETFH */
 #define COMPOUND_ERR_SLACK_SPACE	16     /* OP_SETATTR */

 #define NFSD_LAUNDROMAT_MINTIMEOUT      1   /* seconds */

 /*
  * The following attributes are currently not supported by the NFSv4 server:
  *    ARCHIVE       (deprecated anyway)
  *    HIDDEN        (unlikely to be supported any time soon)
  *    MIMETYPE      (unlikely to be supported any time soon)
  *    QUOTA_*       (will be supported in a forthcoming patch)
  *    SYSTEM        (unlikely to be supported any time soon)
  *    TIME_BACKUP   (unlikely to be supported any time soon)
  *    TIME_CREATE   (unlikely to be supported any time soon)
  */
 #define NFSD4_SUPPORTED_ATTRS_WORD0                                                         \
 (FATTR4_WORD0_SUPPORTED_ATTRS   | FATTR4_WORD0_TYPE         | FATTR4_WORD0_FH_EXPIRE_TYPE   \
  | FATTR4_WORD0_CHANGE          | FATTR4_WORD0_SIZE         | FATTR4_WORD0_LINK_SUPPORT     \
  | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR   | FATTR4_WORD0_FSID             \
  | FATTR4_WORD0_UNIQUE_HANDLES  | FATTR4_WORD0_LEASE_TIME   | FATTR4_WORD0_RDATTR_ERROR     \
  | FATTR4_WORD0_ACLSUPPORT      | FATTR4_WORD0_CANSETTIME   | FATTR4_WORD0_CASE_INSENSITIVE \
  | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED                             \
  | FATTR4_WORD0_FILEHANDLE      | FATTR4_WORD0_FILEID       | FATTR4_WORD0_FILES_AVAIL      \
  | FATTR4_WORD0_FILES_FREE      | FATTR4_WORD0_FILES_TOTAL  | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS      \
  | FATTR4_WORD0_MAXFILESIZE     | FATTR4_WORD0_MAXLINK      | FATTR4_WORD0_MAXNAME          \
  | FATTR4_WORD0_MAXREAD         | FATTR4_WORD0_MAXWRITE     | FATTR4_WORD0_ACL)

 #define NFSD4_SUPPORTED_ATTRS_WORD1                                                         \
 (FATTR4_WORD1_MODE              | FATTR4_WORD1_NO_TRUNC     | FATTR4_WORD1_NUMLINKS         \
  | FATTR4_WORD1_OWNER	        | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
  | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
  | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
  | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
  | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)

 #define NFSD4_SUPPORTED_ATTRS_WORD2 0

 #define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
 	NFSD4_SUPPORTED_ATTRS_WORD0

 #define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
 	NFSD4_SUPPORTED_ATTRS_WORD1

 #define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
 	(NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)

 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 #define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
 	(NFSD4_1_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SECURITY_LABEL)
 #else
 #define NFSD4_2_SUPPORTED_ATTRS_WORD2 0
 #endif

 static inline u32 nfsd_suppattrs0(u32 minorversion)
 {
 	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
 			    : NFSD4_SUPPORTED_ATTRS_WORD0;
 }

 static inline u32 nfsd_suppattrs1(u32 minorversion)
 {
 	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1
 			    : NFSD4_SUPPORTED_ATTRS_WORD1;
 }

 static inline u32 nfsd_suppattrs2(u32 minorversion)
 {
 	switch (minorversion) {
 	default: return NFSD4_2_SUPPORTED_ATTRS_WORD2;
 	case 1:  return NFSD4_1_SUPPORTED_ATTRS_WORD2;
 	case 0:  return NFSD4_SUPPORTED_ATTRS_WORD2;
 	}
 }

 /* These will return ERR_INVAL if specified in GETATTR or READDIR. */
 #define NFSD_WRITEONLY_ATTRS_WORD1 \
 	(FATTR4_WORD1_TIME_ACCESS_SET   | FATTR4_WORD1_TIME_MODIFY_SET)

 /* These are the only attrs allowed in CREATE/OPEN/SETATTR. */
 #define NFSD_WRITEABLE_ATTRS_WORD0 \
 	(FATTR4_WORD0_SIZE | FATTR4_WORD0_ACL)
 #define NFSD_WRITEABLE_ATTRS_WORD1 \
 	(FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP \
 	| FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 #define NFSD_WRITEABLE_ATTRS_WORD2 FATTR4_WORD2_SECURITY_LABEL
 #else
 #define NFSD_WRITEABLE_ATTRS_WORD2 0
 #endif

 #define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
 	NFSD_WRITEABLE_ATTRS_WORD0
 /*
  * we currently store the exclusive create verifier in the v_{a,m}time
  * attributes so the client can't set these at create time using EXCLUSIVE4_1
  */
 #define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
 	(NFSD_WRITEABLE_ATTRS_WORD1 & \
 	 ~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
 #define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
 	NFSD_WRITEABLE_ATTRS_WORD2

 extern int nfsd4_is_junction(struct dentry *dentry);
 extern int register_cld_notifier(void);
 extern void unregister_cld_notifier(void);
 #else /* CONFIG_NFSD_V4 */
 static inline int nfsd4_is_junction(struct dentry *dentry)
 {
 	return 0;
 }

 #define register_cld_notifier() 0
 #define unregister_cld_notifier() do { } while(0)

 #endif /* CONFIG_NFSD_V4 */

 #endif /* LINUX_NFSD_NFSD_H */
	/*
	* Hodge-podge collection of knfsd-related stuff.
	* I will sort this out later.
	*
	* Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
	*/

	#ifndef LINUX_NFSD_NFSD_H
	#define LINUX_NFSD_NFSD_H

	#include <linux/types.h>
	#include <linux/mount.h>

	#include <linux/nfs.h>
	#include <linux/nfs2.h>
	#include <linux/nfs3.h>
	#include <linux/nfs4.h>
	#include <linux/sunrpc/svc.h>
	#include <linux/sunrpc/msg_prot.h>

	#include <linux/nfsd/debug.h>
	#include <linux/nfsd/stats.h>

	#include "export.h"

	/*
	* nfsd version
	*/
	#define NFSD_SUPPORTED_MINOR_VERSION 2
	/*
	* Maximum blocksizes supported by daemon under various circumstances.
	*/
	#define NFSSVC_MAXBLKSIZE RPCSVC_MAXPAYLOAD
	/* NFSv2 is limited by the protocol specification, see RFC 1094 */
	#define NFSSVC_MAXBLKSIZE_V2 (8*1024)


	/*
	* Largest number of bytes we need to allocate for an NFS
	* call or reply. Used to control buffer sizes. We use
	* the length of v3 WRITE, READDIR and READDIR replies
	* which are an RPC header, up to 26 XDR units of reply
	* data, and some page data.
	*
	* Note that accuracy here doesn't matter too much as the
	* size is rounded up to a page size when allocating space.
	*/
	#define NFSD_BUFSIZE ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)

	struct readdir_cd {
	__be32 err; /* 0, nfserr, or nfserr_eof */
	};


	extern struct svc_program nfsd_program;
	extern struct svc_version nfsd_version2, nfsd_version3,
	nfsd_version4;
	extern struct mutex nfsd_mutex;
	extern spinlock_t nfsd_drc_lock;
	extern unsigned long nfsd_drc_max_mem;
	extern unsigned long nfsd_drc_mem_used;

	extern const struct seq_operations nfs_exports_op;

	/*
	* Function prototypes.
	*/
	int nfsd_svc(int nrservs, struct net *net);
	int nfsd_dispatch(struct svc_rqst rqstp, __be32 statp);

	int nfsd_nrthreads(struct net *);
	int nfsd_nrpools(struct net *);
	int nfsd_get_nrthreads(int n, int , struct net );
	int nfsd_set_nrthreads(int n, int , struct net );
	int nfsd_pool_stats_open(struct inode , struct file );
	int nfsd_pool_stats_release(struct inode , struct file );

	void nfsd_destroy(struct net *net);

	#if defined(CONFIG_NFSD_V2_ACL) \|\| defined(CONFIG_NFSD_V3_ACL)
	#ifdef CONFIG_NFSD_V2_ACL
	extern struct svc_version nfsd_acl_version2;
	#else
	#define nfsd_acl_version2 NULL
	#endif
	#ifdef CONFIG_NFSD_V3_ACL
	extern struct svc_version nfsd_acl_version3;
	#else
	#define nfsd_acl_version3 NULL
	#endif
	#endif

	enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
	int nfsd_vers(int vers, enum vers_op change);
	int nfsd_minorversion(u32 minorversion, enum vers_op change);
	void nfsd_reset_versions(void);
	int nfsd_create_serv(struct net *net);

	extern int nfsd_max_blksize;

	static inline int nfsd_v4client(struct svc_rqst *rq)
	{
	return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
	}

	/*
	* NFSv4 State
	*/
	#ifdef CONFIG_NFSD_V4
	extern unsigned long max_delegations;
	void nfs4_state_init(void);
	int nfsd4_init_slabs(void);
	void nfsd4_free_slabs(void);
	int nfs4_state_start(void);
	int nfs4_state_start_net(struct net *net);
	void nfs4_state_shutdown(void);
	void nfs4_state_shutdown_net(struct net *net);
	void nfs4_reset_lease(time_t leasetime);
	int nfs4_reset_recoverydir(char *recdir);
	char * nfs4_recoverydir(void);
	#else
	static inline void nfs4_state_init(void) { }
	static inline int nfsd4_init_slabs(void) { return 0; }
	static inline void nfsd4_free_slabs(void) { }
	static inline int nfs4_state_start(void) { return 0; }
	static inline int nfs4_state_start_net(struct net *net) { return 0; }
	static inline void nfs4_state_shutdown(void) { }
	static inline void nfs4_state_shutdown_net(struct net *net) { }
	static inline void nfs4_reset_lease(time_t leasetime) { }
	static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
	static inline char * nfs4_recoverydir(void) {return NULL; }
	#endif

	/*
	* lockd binding
	*/
	void nfsd_lockd_init(void);
	void nfsd_lockd_shutdown(void);


	/*
	* These macros provide pre-xdr'ed values for faster operation.
	*/
	#define nfs_ok cpu_to_be32(NFS_OK)
	#define nfserr_perm cpu_to_be32(NFSERR_PERM)
	#define nfserr_noent cpu_to_be32(NFSERR_NOENT)
	#define nfserr_io cpu_to_be32(NFSERR_IO)
	#define nfserr_nxio cpu_to_be32(NFSERR_NXIO)
	#define nfserr_eagain cpu_to_be32(NFSERR_EAGAIN)
	#define nfserr_acces cpu_to_be32(NFSERR_ACCES)
	#define nfserr_exist cpu_to_be32(NFSERR_EXIST)
	#define nfserr_xdev cpu_to_be32(NFSERR_XDEV)
	#define nfserr_nodev cpu_to_be32(NFSERR_NODEV)
	#define nfserr_notdir cpu_to_be32(NFSERR_NOTDIR)
	#define nfserr_isdir cpu_to_be32(NFSERR_ISDIR)
	#define nfserr_inval cpu_to_be32(NFSERR_INVAL)
	#define nfserr_fbig cpu_to_be32(NFSERR_FBIG)
	#define nfserr_nospc cpu_to_be32(NFSERR_NOSPC)
	#define nfserr_rofs cpu_to_be32(NFSERR_ROFS)
	#define nfserr_mlink cpu_to_be32(NFSERR_MLINK)
	#define nfserr_opnotsupp cpu_to_be32(NFSERR_OPNOTSUPP)
	#define nfserr_nametoolong cpu_to_be32(NFSERR_NAMETOOLONG)
	#define nfserr_notempty cpu_to_be32(NFSERR_NOTEMPTY)
	#define nfserr_dquot cpu_to_be32(NFSERR_DQUOT)
	#define nfserr_stale cpu_to_be32(NFSERR_STALE)
	#define nfserr_remote cpu_to_be32(NFSERR_REMOTE)
	#define nfserr_wflush cpu_to_be32(NFSERR_WFLUSH)
	#define nfserr_badhandle cpu_to_be32(NFSERR_BADHANDLE)
	#define nfserr_notsync cpu_to_be32(NFSERR_NOT_SYNC)
	#define nfserr_badcookie cpu_to_be32(NFSERR_BAD_COOKIE)
	#define nfserr_notsupp cpu_to_be32(NFSERR_NOTSUPP)
	#define nfserr_toosmall cpu_to_be32(NFSERR_TOOSMALL)
	#define nfserr_serverfault cpu_to_be32(NFSERR_SERVERFAULT)
	#define nfserr_badtype cpu_to_be32(NFSERR_BADTYPE)
	#define nfserr_jukebox cpu_to_be32(NFSERR_JUKEBOX)
	#define nfserr_denied cpu_to_be32(NFSERR_DENIED)
	#define nfserr_deadlock cpu_to_be32(NFSERR_DEADLOCK)
	#define nfserr_expired cpu_to_be32(NFSERR_EXPIRED)
	#define nfserr_bad_cookie cpu_to_be32(NFSERR_BAD_COOKIE)
	#define nfserr_same cpu_to_be32(NFSERR_SAME)
	#define nfserr_clid_inuse cpu_to_be32(NFSERR_CLID_INUSE)
	#define nfserr_stale_clientid cpu_to_be32(NFSERR_STALE_CLIENTID)
	#define nfserr_resource cpu_to_be32(NFSERR_RESOURCE)
	#define nfserr_moved cpu_to_be32(NFSERR_MOVED)
	#define nfserr_nofilehandle cpu_to_be32(NFSERR_NOFILEHANDLE)
	#define nfserr_minor_vers_mismatch cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
	#define nfserr_share_denied cpu_to_be32(NFSERR_SHARE_DENIED)
	#define nfserr_stale_stateid cpu_to_be32(NFSERR_STALE_STATEID)
	#define nfserr_old_stateid cpu_to_be32(NFSERR_OLD_STATEID)
	#define nfserr_bad_stateid cpu_to_be32(NFSERR_BAD_STATEID)
	#define nfserr_bad_seqid cpu_to_be32(NFSERR_BAD_SEQID)
	#define nfserr_symlink cpu_to_be32(NFSERR_SYMLINK)
	#define nfserr_not_same cpu_to_be32(NFSERR_NOT_SAME)
	#define nfserr_lock_range cpu_to_be32(NFSERR_LOCK_RANGE)
	#define nfserr_restorefh cpu_to_be32(NFSERR_RESTOREFH)
	#define nfserr_attrnotsupp cpu_to_be32(NFSERR_ATTRNOTSUPP)
	#define nfserr_bad_xdr cpu_to_be32(NFSERR_BAD_XDR)
	#define nfserr_openmode cpu_to_be32(NFSERR_OPENMODE)
	#define nfserr_badowner cpu_to_be32(NFSERR_BADOWNER)
	#define nfserr_locks_held cpu_to_be32(NFSERR_LOCKS_HELD)
	#define nfserr_op_illegal cpu_to_be32(NFSERR_OP_ILLEGAL)
	#define nfserr_grace cpu_to_be32(NFSERR_GRACE)
	#define nfserr_no_grace cpu_to_be32(NFSERR_NO_GRACE)
	#define nfserr_reclaim_bad cpu_to_be32(NFSERR_RECLAIM_BAD)
	#define nfserr_badname cpu_to_be32(NFSERR_BADNAME)
	#define nfserr_cb_path_down cpu_to_be32(NFSERR_CB_PATH_DOWN)
	#define nfserr_locked cpu_to_be32(NFSERR_LOCKED)
	#define nfserr_wrongsec cpu_to_be32(NFSERR_WRONGSEC)
	#define nfserr_badiomode cpu_to_be32(NFS4ERR_BADIOMODE)
	#define nfserr_badlayout cpu_to_be32(NFS4ERR_BADLAYOUT)
	#define nfserr_bad_session_digest cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
	#define nfserr_badsession cpu_to_be32(NFS4ERR_BADSESSION)
	#define nfserr_badslot cpu_to_be32(NFS4ERR_BADSLOT)
	#define nfserr_complete_already cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
	#define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
	#define nfserr_deleg_already_wanted cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
	#define nfserr_back_chan_busy cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
	#define nfserr_layouttrylater cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
	#define nfserr_layoutunavailable cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
	#define nfserr_nomatching_layout cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
	#define nfserr_recallconflict cpu_to_be32(NFS4ERR_RECALLCONFLICT)
	#define nfserr_unknown_layouttype cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
	#define nfserr_seq_misordered cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
	#define nfserr_sequence_pos cpu_to_be32(NFS4ERR_SEQUENCE_POS)
	#define nfserr_req_too_big cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
	#define nfserr_rep_too_big cpu_to_be32(NFS4ERR_REP_TOO_BIG)
	#define nfserr_rep_too_big_to_cache cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
	#define nfserr_retry_uncached_rep cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
	#define nfserr_unsafe_compound cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
	#define nfserr_too_many_ops cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
	#define nfserr_op_not_in_session cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
	#define nfserr_hash_alg_unsupp cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
	#define nfserr_clientid_busy cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
	#define nfserr_pnfs_io_hole cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
	#define nfserr_seq_false_retry cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
	#define nfserr_bad_high_slot cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
	#define nfserr_deadsession cpu_to_be32(NFS4ERR_DEADSESSION)
	#define nfserr_encr_alg_unsupp cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
	#define nfserr_pnfs_no_layout cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
	#define nfserr_not_only_op cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
	#define nfserr_wrong_cred cpu_to_be32(NFS4ERR_WRONG_CRED)
	#define nfserr_wrong_type cpu_to_be32(NFS4ERR_WRONG_TYPE)
	#define nfserr_dirdeleg_unavail cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
	#define nfserr_reject_deleg cpu_to_be32(NFS4ERR_REJECT_DELEG)
	#define nfserr_returnconflict cpu_to_be32(NFS4ERR_RETURNCONFLICT)
	#define nfserr_deleg_revoked cpu_to_be32(NFS4ERR_DELEG_REVOKED)
	#define nfserr_partner_notsupp cpu_to_be32(NFS4ERR_PARTNER_NOTSUPP)
	#define nfserr_partner_no_auth cpu_to_be32(NFS4ERR_PARTNER_NO_AUTH)
	#define nfserr_metadata_notsupp cpu_to_be32(NFS4ERR_METADATA_NOTSUPP)
	#define nfserr_offload_denied cpu_to_be32(NFS4ERR_OFFLOAD_DENIED)
	#define nfserr_wrong_lfs cpu_to_be32(NFS4ERR_WRONG_LFS)
	#define nfserr_badlabel cpu_to_be32(NFS4ERR_BADLABEL)

	/* error codes for internal use */
	/* if a request fails due to kmalloc failure, it gets dropped.
	* Client should resend eventually
	*/
	#define nfserr_dropit cpu_to_be32(30000)
	/* end-of-file indicator in readdir */
	#define nfserr_eof cpu_to_be32(30001)
	/* replay detected */
	#define nfserr_replay_me cpu_to_be32(11001)
	/* nfs41 replay detected */
	#define nfserr_replay_cache cpu_to_be32(11002)

	/* Check for dir entries '.' and '..' */
	#define isdotent(n, l) (l < 3 && n[0] == '.' && (l == 1 \|\| n[1] == '.'))

	#ifdef CONFIG_NFSD_V4

	/* before processing a COMPOUND operation, we have to check that there
	* is enough space in the buffer for XDR encode to succeed. otherwise,
	* we might process an operation with side effects, and be unable to
	* tell the client that the operation succeeded.
	*
	* COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
	* needed to encode an "ordinary" _successful_ operation. (GETATTR,
	* READ, READDIR, and READLINK have their own buffer checks.) if we
	* fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
	*
	* COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
	* needed to encode an operation which has failed with NFS4ERR_RESOURCE.
	* care is taken to ensure that we never fall below this level for any
	* reason.
	*/
	#define COMPOUND_SLACK_SPACE 140 /* OP_GETFH */
	#define COMPOUND_ERR_SLACK_SPACE 16 /* OP_SETATTR */

	#define NFSD_LAUNDROMAT_MINTIMEOUT 1 /* seconds */

	/*
	* The following attributes are currently not supported by the NFSv4 server:
	* ARCHIVE (deprecated anyway)
	* HIDDEN (unlikely to be supported any time soon)
	* MIMETYPE (unlikely to be supported any time soon)
	* QUOTA_* (will be supported in a forthcoming patch)
	* SYSTEM (unlikely to be supported any time soon)
	* TIME_BACKUP (unlikely to be supported any time soon)
	* TIME_CREATE (unlikely to be supported any time soon)
	*/
	#define NFSD4_SUPPORTED_ATTRS_WORD0 \
	(FATTR4_WORD0_SUPPORTED_ATTRS \| FATTR4_WORD0_TYPE \| FATTR4_WORD0_FH_EXPIRE_TYPE \
	\| FATTR4_WORD0_CHANGE \| FATTR4_WORD0_SIZE \| FATTR4_WORD0_LINK_SUPPORT \
	\| FATTR4_WORD0_SYMLINK_SUPPORT \| FATTR4_WORD0_NAMED_ATTR \| FATTR4_WORD0_FSID \
	\| FATTR4_WORD0_UNIQUE_HANDLES \| FATTR4_WORD0_LEASE_TIME \| FATTR4_WORD0_RDATTR_ERROR \
	\| FATTR4_WORD0_ACLSUPPORT \| FATTR4_WORD0_CANSETTIME \| FATTR4_WORD0_CASE_INSENSITIVE \
	\| FATTR4_WORD0_CASE_PRESERVING \| FATTR4_WORD0_CHOWN_RESTRICTED \
	\| FATTR4_WORD0_FILEHANDLE \| FATTR4_WORD0_FILEID \| FATTR4_WORD0_FILES_AVAIL \
	\| FATTR4_WORD0_FILES_FREE \| FATTR4_WORD0_FILES_TOTAL \| FATTR4_WORD0_FS_LOCATIONS \| FATTR4_WORD0_HOMOGENEOUS \
	\| FATTR4_WORD0_MAXFILESIZE \| FATTR4_WORD0_MAXLINK \| FATTR4_WORD0_MAXNAME \
	\| FATTR4_WORD0_MAXREAD \| FATTR4_WORD0_MAXWRITE \| FATTR4_WORD0_ACL)

	#define NFSD4_SUPPORTED_ATTRS_WORD1 \
	(FATTR4_WORD1_MODE \| FATTR4_WORD1_NO_TRUNC \| FATTR4_WORD1_NUMLINKS \
	\| FATTR4_WORD1_OWNER \| FATTR4_WORD1_OWNER_GROUP \| FATTR4_WORD1_RAWDEV \
	\| FATTR4_WORD1_SPACE_AVAIL \| FATTR4_WORD1_SPACE_FREE \| FATTR4_WORD1_SPACE_TOTAL \
	\| FATTR4_WORD1_SPACE_USED \| FATTR4_WORD1_TIME_ACCESS \| FATTR4_WORD1_TIME_ACCESS_SET \
	\| FATTR4_WORD1_TIME_DELTA \| FATTR4_WORD1_TIME_METADATA \
	\| FATTR4_WORD1_TIME_MODIFY \| FATTR4_WORD1_TIME_MODIFY_SET \| FATTR4_WORD1_MOUNTED_ON_FILEID)

	#define NFSD4_SUPPORTED_ATTRS_WORD2 0

	#define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
	NFSD4_SUPPORTED_ATTRS_WORD0

	#define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
	NFSD4_SUPPORTED_ATTRS_WORD1

	#define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
	(NFSD4_SUPPORTED_ATTRS_WORD2 \| FATTR4_WORD2_SUPPATTR_EXCLCREAT)

	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
	#define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
	(NFSD4_1_SUPPORTED_ATTRS_WORD2 \| FATTR4_WORD2_SECURITY_LABEL)
	#else
	#define NFSD4_2_SUPPORTED_ATTRS_WORD2 0
	#endif

	static inline u32 nfsd_suppattrs0(u32 minorversion)
	{
	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
	: NFSD4_SUPPORTED_ATTRS_WORD0;
	}

	static inline u32 nfsd_suppattrs1(u32 minorversion)
	{
	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1
	: NFSD4_SUPPORTED_ATTRS_WORD1;
	}

	static inline u32 nfsd_suppattrs2(u32 minorversion)
	{
	switch (minorversion) {
	default: return NFSD4_2_SUPPORTED_ATTRS_WORD2;
	case 1: return NFSD4_1_SUPPORTED_ATTRS_WORD2;
	case 0: return NFSD4_SUPPORTED_ATTRS_WORD2;
	}
	}

	/* These will return ERR_INVAL if specified in GETATTR or READDIR. */
	#define NFSD_WRITEONLY_ATTRS_WORD1 \
	(FATTR4_WORD1_TIME_ACCESS_SET \| FATTR4_WORD1_TIME_MODIFY_SET)

	/* These are the only attrs allowed in CREATE/OPEN/SETATTR. */
	#define NFSD_WRITEABLE_ATTRS_WORD0 \
	(FATTR4_WORD0_SIZE \| FATTR4_WORD0_ACL)
	#define NFSD_WRITEABLE_ATTRS_WORD1 \
	(FATTR4_WORD1_MODE \| FATTR4_WORD1_OWNER \| FATTR4_WORD1_OWNER_GROUP \
	\| FATTR4_WORD1_TIME_ACCESS_SET \| FATTR4_WORD1_TIME_MODIFY_SET)
	#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
	#define NFSD_WRITEABLE_ATTRS_WORD2 FATTR4_WORD2_SECURITY_LABEL
	#else
	#define NFSD_WRITEABLE_ATTRS_WORD2 0
	#endif

	#define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
	NFSD_WRITEABLE_ATTRS_WORD0
	/*
	* we currently store the exclusive create verifier in the v_{a,m}time
	* attributes so the client can't set these at create time using EXCLUSIVE4_1
	*/
	#define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
	(NFSD_WRITEABLE_ATTRS_WORD1 & \
	~(FATTR4_WORD1_TIME_ACCESS_SET \| FATTR4_WORD1_TIME_MODIFY_SET))
	#define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
	NFSD_WRITEABLE_ATTRS_WORD2

	extern int nfsd4_is_junction(struct dentry *dentry);
	extern int register_cld_notifier(void);
	extern void unregister_cld_notifier(void);
	#else /* CONFIG_NFSD_V4 */
	static inline int nfsd4_is_junction(struct dentry *dentry)
	{
	return 0;
	}

	#define register_cld_notifier() 0
	#define unregister_cld_notifier() do { } while(0)

	#endif /* CONFIG_NFSD_V4 */

	#endif /* LINUX_NFSD_NFSD_H */