[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / nfsd / nfsd.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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 <uapi/linux/nfsd/debug.h>

#include "stats.h"
#include "export.h"

#undef ifdebug
#ifdef CONFIG_SUNRPC_DEBUG
# define ifdebug(flag)		if (nfsd_debug & NFSDDBG_##flag)
#else
# define ifdebug(flag)		if (0)
#endif

/*
 * 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 const 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 const struct svc_version nfsd_acl_version2;
#else
#define nfsd_acl_version2 NULL
#endif
#ifdef CONFIG_NFSD_V3_ACL
extern const 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;
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);
bool nfsd4_spo_must_allow(struct svc_rqst *rqstp);
#else
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; }
static inline bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
{
	return false;
}
#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_union_notsupp		cpu_to_be32(NFS4ERR_UNION_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

/* 4.1 */
#ifdef CONFIG_NFSD_PNFS
#define PNFSD_SUPPORTED_ATTRS_WORD1	FATTR4_WORD1_FS_LAYOUT_TYPES
#define PNFSD_SUPPORTED_ATTRS_WORD2 \
(FATTR4_WORD2_LAYOUT_BLKSIZE	| FATTR4_WORD2_LAYOUT_TYPES)
#else
#define PNFSD_SUPPORTED_ATTRS_WORD1	0
#define PNFSD_SUPPORTED_ATTRS_WORD2	0
#endif /* CONFIG_NFSD_PNFS */

#define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
	NFSD4_SUPPORTED_ATTRS_WORD0

#define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
	(NFSD4_SUPPORTED_ATTRS_WORD1	| PNFSD_SUPPORTED_ATTRS_WORD1)

#define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
	(NFSD4_SUPPORTED_ATTRS_WORD2	| PNFSD_SUPPORTED_ATTRS_WORD2 | \
	 FATTR4_WORD2_SUPPATTR_EXCLCREAT)

/* 4.2 */
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
#define NFSD4_2_SECURITY_ATTRS		FATTR4_WORD2_SECURITY_LABEL
#else
#define NFSD4_2_SECURITY_ATTRS		0
#endif

#define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
	(NFSD4_1_SUPPORTED_ATTRS_WORD2 | \
	FATTR4_WORD2_MODE_UMASK | \
	NFSD4_2_SECURITY_ATTRS)

extern const u32 nfsd_suppattrs[3][3];

static inline bool bmval_is_subset(const u32 *bm1, const u32 *bm2)
{
	return !((bm1[0] & ~bm2[0]) ||
	         (bm1[1] & ~bm2[1]) ||
		 (bm1[2] & ~bm2[2]));
}

static inline bool nfsd_attrs_supported(u32 minorversion, const u32 *bmval)
{
	return bmval_is_subset(bmval, nfsd_suppattrs[minorversion]);
}

/* 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. Don't add
 * a writeable attribute here without also adding code to parse it to
 * nfsd4_decode_fattr().
 */
#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 MAYBE_FATTR4_WORD2_SECURITY_LABEL \
	FATTR4_WORD2_SECURITY_LABEL
#else
#define MAYBE_FATTR4_WORD2_SECURITY_LABEL 0
#endif
#define NFSD_WRITEABLE_ATTRS_WORD2 \
	(FATTR4_WORD2_MODE_UMASK \
	| MAYBE_FATTR4_WORD2_SECURITY_LABEL)

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