static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_fsinfo *info)
{
	u32 bitmask[3];
	struct nfs4_lookup_root_arg args = {
		.bitmask = bitmask,
	};
	struct nfs4_lookup_res res = {
		.server = server,
		.fattr = info->fattr,
		.fh = fhandle,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};

	bitmask[0] = nfs4_fattr_bitmap[0];
	bitmask[1] = nfs4_fattr_bitmap[1];
	/*
	 * Process the label in the upcoming getfattr
	 */
	bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;

	nfs_fattr_init(info->fattr);
	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
}

struct nfs4_opendata

static int _nfs4_recover_proc_open(struct nfs4_opendata *data);

static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);

static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);

static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);

static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs_open_context *ctx, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);

static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		const struct cred *cred,
		struct nfs4_slot *slot,
		bool is_privileged);

static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		const struct cred *);

static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
		const struct cred *, bool);

const u32 nfs4_fattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY
	| FATTR4_WORD1_MOUNTED_ON_FILEID,
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_pnfs_open_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY,
	FATTR4_WORD2_MDSTHRESHOLD
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	| FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_open_noattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_FILEID,
};

const u32 nfs4_statfs_bitmap[3] = {
	FATTR4_WORD0_FILES_AVAIL
	| FATTR4_WORD0_FILES_FREE
	| FATTR4_WORD0_FILES_TOTAL,
	FATTR4_WORD1_SPACE_AVAIL
	| FATTR4_WORD1_SPACE_FREE
	| FATTR4_WORD1_SPACE_TOTAL
};

const u32 nfs4_pathconf_bitmap[3] = {
	FATTR4_WORD0_MAXLINK
	| FATTR4_WORD0_MAXNAME,
	0
};


encode_layoutreturn(struct xdr_stream *xdr,
		    const struct nfs4_layoutreturn_args *args,
		    struct compound_hdr *hdr)
{
}

nfs: Fix getxattr kernel panic and memory overflow

Move the buffer size check to decode_attr_security_label() before memcpy()
Only call memcpy() if the buffer is large enough

Fixes: aa9c2669626c ("NFS: Client implementation of Labeled-NFS")
Signed-off-by: Jeffrey Mitchell <jeffrey.mitchell@starlab.io>
[Trond: clean up duplicate test of label->len != 0]
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

struct compound_hdr

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


_nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
{
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_removeargs args = {
		.fh = NFS_FH(dir),
		.name = *name,
	};
	struct nfs_removeres res = {
		.server = server,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
	unsigned long timestamp = jiffies;
	int status;

	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
	if (status == 0) {
		spin_lock(&dir->i_lock);
		nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
					      NFS_INO_INVALID_DATA);
		/* Removing a directory decrements nlink in the parent */
		if (ftype == NF4DIR && dir->i_nlink > 2)
			nfs4_dec_nlink_locked(dir);
		spin_unlock(&dir->i_lock);
	}
	return status;
}


static int nfs4_run_open_task(struct nfs4_opendata *data,
			      struct nfs_open_context *ctx)
{
	struct inode *dir = d_inode(data->dir);
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs_openargs *o_arg = &data->o_arg;
	struct nfs_openres *o_res = &data->o_res;
	struct rpc_task *task;
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
		.rpc_argp = o_arg,
		.rpc_resp = o_res,
		.rpc_cred = data->owner->so_cred,
	};
	struct rpc_task_setup task_setup_data = {
		.rpc_client = server->client,
		.rpc_message = &msg,
		.callback_ops = &nfs4_open_ops,
		.callback_data = data,
		.workqueue = nfsiod_workqueue,
		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
	};
	int status;

	kref_get(&data->kref);
	data->rpc_done = false;
	data->rpc_status = 0;
	data->cancelled = false;
	data->is_recover = false;
	if (!ctx) {
		nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
		data->is_recover = true;
		task_setup_data.flags |= RPC_TASK_TIMEOUT;
	} else {
		nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
		pnfs_lgopen_prepare(data, ctx);
	}
	task = rpc_run_task(&task_setup_data);
	if (IS_ERR(task))
		return PTR_ERR(task);
	status = rpc_wait_for_completion_task(task);
	if (status != 0) {
		data->cancelled = true;
		smp_wmb();
	} else
		status = data->rpc_status;
	rpc_put_task(task);

	return status;
}

struct nfs4_opendata

static int _nfs4_recover_proc_open(struct nfs4_opendata *data);

static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);

static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);

static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);

static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs_open_context *ctx, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);

static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		const struct cred *cred,
		struct nfs4_slot *slot,
		bool is_privileged);

static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		const struct cred *);

static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
		const struct cred *, bool);

static const u32 nfs4_pnfs_open_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY,
	FATTR4_WORD2_MDSTHRESHOLD
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	| FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_open_noattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_FILEID,
};

struct nfs4_call_sync_data {
	const struct nfs_server *seq_server;
	struct nfs4_sequence_args *seq_args;
	struct nfs4_sequence_res *seq_res;
}

static const struct rpc_call_ops nfs41_call_sync_ops = {
	.rpc_call_prepare = nfs41_call_sync_prepare,
	.rpc_call_done = nfs41_call_sync_done,
};

static const struct rpc_call_ops nfs40_call_sync_ops = {
	.rpc_call_prepare = nfs40_call_sync_prepare,
	.rpc_call_done = nfs40_call_sync_done,
};

struct nfs4_open_createattrs {
	struct nfs4_label *label;
	struct iattr *sattr;
	const __u32 verf[2];
}

static const struct rpc_call_ops nfs4_open_confirm_ops = {
	.rpc_call_prepare = nfs4_open_confirm_prepare,
	.rpc_call_done = nfs4_open_confirm_done,
	.rpc_release = nfs4_open_confirm_release,
};

static const struct rpc_call_ops nfs4_open_ops = {
	.rpc_call_prepare = nfs4_open_prepare,
	.rpc_call_done = nfs4_open_done,
	.rpc_release = nfs4_open_release,
};

struct nfs4_closedata {
	struct inode *inode;
	struct nfs4_state *state;
	struct nfs_closeargs arg;
	struct nfs_closeres res;
	struct {
		struct nfs4_layoutreturn_args arg;
		struct nfs4_layoutreturn_res res;
		struct nfs4_xdr_opaque_data ld_private;
		u32 roc_barrier;
		bool roc;
	} lr;
	struct nfs_fattr fattr;
	unsigned long timestamp;
}


static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
{
	return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}

static struct {
	int stat;
	int errno;
} nfs_errtbl[] = {
	{ NFS4_OK,		0		},
	{ NFS4ERR_PERM,		-EPERM		},
	{ NFS4ERR_NOENT,	-ENOENT		},
	{ NFS4ERR_IO,		-errno_NFSERR_IO},
	{ NFS4ERR_NXIO,		-ENXIO		},
	{ NFS4ERR_ACCESS,	-EACCES		},
	{ NFS4ERR_EXIST,	-EEXIST		},
	{ NFS4ERR_XDEV,		-EXDEV		},
	{ NFS4ERR_NOTDIR,	-ENOTDIR	},
	{ NFS4ERR_ISDIR,	-EISDIR		},
	{ NFS4ERR_INVAL,	-EINVAL		},
	{ NFS4ERR_FBIG,		-EFBIG		},
	{ NFS4ERR_NOSPC,	-ENOSPC		},
	{ NFS4ERR_ROFS,		-EROFS		},
	{ NFS4ERR_MLINK,	-EMLINK		},
	{ NFS4ERR_NAMETOOLONG,	-ENAMETOOLONG	},
	{ NFS4ERR_NOTEMPTY,	-ENOTEMPTY	},
	{ NFS4ERR_DQUOT,	-EDQUOT		},
	{ NFS4ERR_STALE,	-ESTALE		},
	{ NFS4ERR_BADHANDLE,	-EBADHANDLE	},
	{ NFS4ERR_BAD_COOKIE,	-EBADCOOKIE	},
	{ NFS4ERR_NOTSUPP,	-ENOTSUPP	},
	{ NFS4ERR_TOOSMALL,	-ETOOSMALL	},
	{ NFS4ERR_SERVERFAULT,	-EREMOTEIO	},
	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
	{ NFS4ERR_LOCKED,	-EAGAIN		},
	{ NFS4ERR_SYMLINK,	-ELOOP		},
	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
	{ NFS4ERR_NOXATTR,	-ENODATA	},
	{ NFS4ERR_XATTR2BIG,	-E2BIG		},
	{ -1,			-EIO		}
};


static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const void *data)
{
	const struct nfs4_lookup_root_arg *args = data;
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putrootfh(xdr, &hdr);
	encode_getfh(xdr, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
{
	if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
		return true;
	if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
		return true;
	if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
		return true;
	return false;
}


static int decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
	stateid->type = NFS4_LAYOUT_STATEID_TYPE;
	return decode_stateid(xdr, stateid);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
				XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
				1 /* layout type */

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
				void *res)
{
	return nfs4_xdr_dec_create(rqstp, xdr, res);
}


static int _nfs4_do_setattr(struct inode *inode,
			    struct nfs_setattrargs *arg,
			    struct nfs_setattrres *res,
			    const struct cred *cred,
			    struct nfs_open_context *ctx)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct rpc_message msg = {
		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
		.rpc_argp	= arg,
		.rpc_resp	= res,
		.rpc_cred	= cred,
	};
	const struct cred *delegation_cred = NULL;
	unsigned long timestamp = jiffies;
	bool truncate;
	int status;

	nfs_fattr_init(res->fattr);

	/* Servers should only apply open mode checks for file size changes */
	truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
	if (!truncate)
		goto zero_stateid;

	if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
		/* Use that stateid */
	} else if (ctx != NULL && ctx->state) {
		struct nfs_lock_context *l_ctx;
		if (!nfs4_valid_open_stateid(ctx->state))
			return -EBADF;
		l_ctx = nfs_get_lock_context(ctx);
		if (IS_ERR(l_ctx))
			return PTR_ERR(l_ctx);
		status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
						&arg->stateid, &delegation_cred);
		nfs_put_lock_context(l_ctx);
		if (status == -EIO)
			return -EBADF;
		else if (status == -EAGAIN)
			goto zero_stateid;
	} else {
zero_stateid:
		nfs4_stateid_copy(&arg->stateid, &zero_stateid);
	}
	if (delegation_cred)
		msg.rpc_cred = delegation_cred;

	status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);

	put_cred(delegation_cred);
	if (status == 0 && ctx != NULL)
		renew_lease(server, timestamp);
	trace_nfs4_setattr(inode, &arg->stateid, status);
	return status;
}

#define NFS4_VALID_ATTRS (ATTR_MODE \
	| ATTR_UID \
	| ATTR_GID \
	| ATTR_SIZE \
	| ATTR_ATIME \
	| ATTR_MTIME \
	| ATTR_CTIME \
	| ATTR_ATIME_SET \
	| ATTR_MTIME_SET)

struct nfs4_opendata

static int _nfs4_recover_proc_open(struct nfs4_opendata *data);

static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);

static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);

static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);

static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs_open_context *ctx, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);

static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		const struct cred *cred,
		struct nfs4_slot *slot,
		bool is_privileged);

static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		const struct cred *);

static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
		const struct cred *, bool);

const u32 nfs4_fattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY
	| FATTR4_WORD1_MOUNTED_ON_FILEID,
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_pnfs_open_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY,
	FATTR4_WORD2_MDSTHRESHOLD
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	| FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_open_noattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_FILEID,
};

const u32 nfs4_statfs_bitmap[3] = {
	FATTR4_WORD0_FILES_AVAIL
	| FATTR4_WORD0_FILES_FREE
	| FATTR4_WORD0_FILES_TOTAL,
	FATTR4_WORD1_SPACE_AVAIL
	| FATTR4_WORD1_SPACE_FREE
	| FATTR4_WORD1_SPACE_TOTAL
};


static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
{
#if defined(CONFIG_NFS_V4_1)
	struct nfs4_session *session = args->sa_slot->table->session;
	if (session)
		return session->clp->cl_mvops->minor_version;
#endif /* CONFIG_NFS_V4_1 */
	return 0;
}


static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
				 const void *data)
{
	const struct nfs4_readdir_arg *args = data;
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_readdir(xdr, args, req, &hdr);

	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
				args->count, hdr.replen);
	encode_nops(&hdr);
}


static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
			decode_setclientid_confirm_maxsz, hdr);
	encode_uint64(xdr, arg->clientid);
	encode_nfs4_verifier(xdr, &arg->confirm);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define decode_setclientid_maxsz \
				(op_decode_hdr_maxsz + \
				2 /* clientid */

#define decode_setclientid_confirm_maxsz \
				(op_decode_hdr_maxsz)

#define NFS4_dec_setclientid_confirm_sz \
				(compound_decode_hdr_maxsz + \
				decode_setclientid_confirm_maxsz)

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
		struct dentry *dentry, struct nfs_fh *fhandle,
		struct nfs_fattr *fattr, struct nfs4_label *label)
{
	struct nfs_server *server = NFS_SERVER(dir);
	int		       status;
	struct nfs4_lookup_arg args = {
		.bitmask = server->attr_bitmask,
		.dir_fh = NFS_FH(dir),
		.name = &dentry->d_name,
	};
	struct nfs4_lookup_res res = {
		.server = server,
		.fattr = fattr,
		.label = label,
		.fh = fhandle,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
	unsigned short task_flags = 0;

	/* Is this is an attribute revalidation, subject to softreval? */
	if (nfs_lookup_is_soft_revalidate(dentry))
		task_flags |= RPC_TASK_TIMEOUT;

	args.bitmask = nfs4_bitmask(server, label);

	nfs_fattr_init(fattr);

	dprintk("NFS call  lookup %pd2\n", dentry);
	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
	status = nfs4_do_call_sync(clnt, server, &msg,
			&args.seq_args, &res.seq_res, task_flags);
	dprintk("NFS reply lookup: %d\n", status);
	return status;
}


int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
		struct page **pages)
{
	struct page *newpage, **spages;
	int rc = 0;
	size_t len;
	spages = pages;

	do {
		len = min_t(size_t, PAGE_SIZE, buflen);
		newpage = alloc_page(GFP_KERNEL);

		if (newpage == NULL)
			goto unwind;
		memcpy(page_address(newpage), buf, len);
		buf += len;
		buflen -= len;
		*pages++ = newpage;
		rc++;
	} while (buflen != 0);

	return rc;

unwind:
	for(; rc > 0; rc--)
		__free_page(spages[rc-1]);
	return -ENOMEM;
}


static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
{
	struct nfs_server *server = NFS_SERVER(state->inode);
	struct nfs4_exception exception = {
		.inode = state->inode,
	};
	int err;

	err = nfs4_set_lock_state(state, request);
	if (err != 0)
		return err;
	if (!recover_lost_locks) {
		set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
		return 0;
	}
	do {
		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
			return 0;
		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
		switch (err) {
		default:
			goto out;
		case -NFS4ERR_GRACE:
		case -NFS4ERR_DELAY:
			nfs4_handle_exception(server, err, &exception);
			err = 0;
		}
	} while (exception.retry);
out:
	return err;
}


static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp,
				 struct xdr_stream *xdr,
				 void *res)
{
	struct compound_hdr hdr;
	int status;

	status = decode_compound_hdr(xdr, &hdr);
	if (!status)
		status = decode_sequence(xdr, res, rqstp);
	return status;
}


int nfs4_proc_destroy_session(struct nfs4_session *session,
		const struct cred *cred)
{
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
		.rpc_argp = session,
		.rpc_cred = cred,
	};
	int status = 0;

	dprintk("--> nfs4_proc_destroy_session\n");

	/* session is still being setup */
	if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
		return 0;

	status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
			       RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
	trace_nfs4_destroy_session(session->clp, status);

	if (status)
		dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
			"Session has been destroyed regardless...\n", status);

	dprintk("<-- nfs4_proc_destroy_session\n");
	return status;
}


static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
				struct nfs_fattr *fattr, struct nfs4_label *label,
				struct inode *inode)
{
	__u32 bitmask[NFS4_BITMASK_SZ];
	struct nfs4_getattr_arg args = {
		.fh = fhandle,
		.bitmask = bitmask,
	};
	struct nfs4_getattr_res res = {
		.fattr = fattr,
		.label = label,
		.server = server,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
	unsigned short task_flags = 0;

	/* Is this is an attribute revalidation, subject to softreval? */
	if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
		task_flags |= RPC_TASK_TIMEOUT;

	nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);

	nfs_fattr_init(fattr);
	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
	return nfs4_do_call_sync(server->client, server, &msg,
			&args.seq_args, &res.seq_res, task_flags);
}

#define NFS4_BITMASK_SZ		3

struct nfs4_opendata

static int _nfs4_recover_proc_open(struct nfs4_opendata *data);

static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);

static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);

static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);

static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs_open_context *ctx, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);

static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		const struct cred *cred,
		struct nfs4_slot *slot,
		bool is_privileged);

static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		const struct cred *);

static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
		const struct cred *, bool);

static const u32 nfs4_pnfs_open_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY,
	FATTR4_WORD2_MDSTHRESHOLD
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	| FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_open_noattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_FILEID,
};

struct nfs4_call_sync_data {
	const struct nfs_server *seq_server;
	struct nfs4_sequence_args *seq_args;
	struct nfs4_sequence_res *seq_res;
}

static const struct rpc_call_ops nfs41_call_sync_ops = {
	.rpc_call_prepare = nfs41_call_sync_prepare,
	.rpc_call_done = nfs41_call_sync_done,
};

static const struct rpc_call_ops nfs40_call_sync_ops = {
	.rpc_call_prepare = nfs40_call_sync_prepare,
	.rpc_call_done = nfs40_call_sync_done,
};

struct nfs4_open_createattrs {
	struct nfs4_label *label;
	struct iattr *sattr;
	const __u32 verf[2];
}

static const struct rpc_call_ops nfs4_open_confirm_ops = {
	.rpc_call_prepare = nfs4_open_confirm_prepare,
	.rpc_call_done = nfs4_open_confirm_done,
	.rpc_release = nfs4_open_confirm_release,
};

static const struct rpc_call_ops nfs4_open_ops = {
	.rpc_call_prepare = nfs4_open_prepare,
	.rpc_call_done = nfs4_open_done,
	.rpc_release = nfs4_open_release,
};

struct nfs4_closedata {
	struct inode *inode;
	struct nfs4_state *state;
	struct nfs_closeargs arg;
	struct nfs_closeres res;
	struct {
		struct nfs4_layoutreturn_args arg;
		struct nfs4_layoutreturn_res res;
		struct nfs4_xdr_opaque_data ld_private;
		u32 roc_barrier;
		bool roc;
	} lr;
	struct nfs_fattr fattr;
	unsigned long timestamp;
}


static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
	encode_nfs4_stateid(xdr, stateid);
	encode_string(xdr, name->len, name->name);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define encode_setclientid_maxsz \
				(op_encode_hdr_maxsz + \
				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
				/* client name */

#define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
				encode_verifier_maxsz + \
				1 /* co_ownerid.len */

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


nfs4_label_release_security(struct nfs4_label *label)
{
	if (label)
		security_release_secctx(label->label, label->len);
}

struct nfs4_opendata

static int _nfs4_recover_proc_open(struct nfs4_opendata *data);

static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);

static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);

static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);

static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs_open_context *ctx, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);

static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		const struct cred *cred,
		struct nfs4_slot *slot,
		bool is_privileged);

static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		const struct cred *);

static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
		const struct cred *, bool);

struct nfs4_call_sync_data {
	const struct nfs_server *seq_server;
	struct nfs4_sequence_args *seq_args;
	struct nfs4_sequence_res *seq_res;
}

static const struct rpc_call_ops nfs41_call_sync_ops = {
	.rpc_call_prepare = nfs41_call_sync_prepare,
	.rpc_call_done = nfs41_call_sync_done,
};

static const struct rpc_call_ops nfs40_call_sync_ops = {
	.rpc_call_prepare = nfs40_call_sync_prepare,
	.rpc_call_done = nfs40_call_sync_done,
};

struct nfs4_open_createattrs {
	struct nfs4_label *label;
	struct iattr *sattr;
	const __u32 verf[2];
}

static const struct rpc_call_ops nfs4_open_confirm_ops = {
	.rpc_call_prepare = nfs4_open_confirm_prepare,
	.rpc_call_done = nfs4_open_confirm_done,
	.rpc_release = nfs4_open_confirm_release,
};

static const struct rpc_call_ops nfs4_open_ops = {
	.rpc_call_prepare = nfs4_open_prepare,
	.rpc_call_done = nfs4_open_done,
	.rpc_release = nfs4_open_release,
};

struct nfs4_closedata {
	struct inode *inode;
	struct nfs4_state *state;
	struct nfs_closeargs arg;
	struct nfs_closeres res;
	struct {
		struct nfs4_layoutreturn_args arg;
		struct nfs4_layoutreturn_res res;
		struct nfs4_xdr_opaque_data ld_private;
		u32 roc_barrier;
		bool roc;
	} lr;
	struct nfs_fattr fattr;
	unsigned long timestamp;
}

static const struct rpc_call_ops nfs4_close_ops = {
	.rpc_call_prepare = nfs4_close_prepare,
	.rpc_call_done = nfs4_close_done,
	.rpc_release = nfs4_free_closedata,
};

struct nfs4_createdata {
	struct rpc_message msg;
	struct nfs4_create_arg arg;
	struct nfs4_create_res res;
	struct nfs_fh fh;
	struct nfs_fattr fattr;
	struct nfs4_label *label;
}

struct nfs4_renewdata {
	struct nfs_client	*client;
	unsigned long		timestamp;
}

static const struct rpc_call_ops nfs4_renew_ops = {
	.rpc_call_done = nfs4_renew_done,
	.rpc_release = nfs4_renew_release,
};

struct nfs4_cached_acl {
	int cached;
	size_t len;
	char data[];
}

static const struct rpc_call_ops nfs4_setclientid_ops = {
	.rpc_call_done = nfs4_setclientid_done,
};


static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
{
	struct nfs_server *server = NFS_SERVER(state->inode);
	struct nfs4_exception exception = { };
	int err;
	do {
		err = _nfs4_do_open_reclaim(ctx, state);
		trace_nfs4_open_reclaim(ctx, 0, err);
		if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
			continue;
		if (err != -NFS4ERR_DELAY)
			break;
		nfs4_handle_exception(server, err, &exception);
	} while (exception.retry);
	return err;
}


nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
{
	if (inode == NULL || !nfs_have_layout(inode))
		return false;

	return pnfs_wait_on_layoutreturn(inode, task);
}


static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
{
	unsigned int savep;
	uint32_t attrlen, bitmap[3] = {0};
	int status;

	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
		goto xdr_error;
	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
		goto xdr_error;
	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
		goto xdr_error;

	if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
		goto xdr_error;
	if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
		goto xdr_error;
	if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
		goto xdr_error;

	status = -EIO;
	if (unlikely(bitmap[0]))
		goto xdr_error;

	if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
		goto xdr_error;
	if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
		goto xdr_error;
	if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
		goto xdr_error;

	status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
	dprintk("%s: xdr returned %d!\n", __func__, -status);
	return status;
}

#define errno_NFSERR_IO		EIO

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}

static struct {
	int stat;
	int errno;
} nfs_errtbl[] = {
	{ NFS4_OK,		0		},
	{ NFS4ERR_PERM,		-EPERM		},
	{ NFS4ERR_NOENT,	-ENOENT		},
	{ NFS4ERR_IO,		-errno_NFSERR_IO},
	{ NFS4ERR_NXIO,		-ENXIO		},
	{ NFS4ERR_ACCESS,	-EACCES		},
	{ NFS4ERR_EXIST,	-EEXIST		},
	{ NFS4ERR_XDEV,		-EXDEV		},
	{ NFS4ERR_NOTDIR,	-ENOTDIR	},
	{ NFS4ERR_ISDIR,	-EISDIR		},
	{ NFS4ERR_INVAL,	-EINVAL		},
	{ NFS4ERR_FBIG,		-EFBIG		},
	{ NFS4ERR_NOSPC,	-ENOSPC		},
	{ NFS4ERR_ROFS,		-EROFS		},
	{ NFS4ERR_MLINK,	-EMLINK		},
	{ NFS4ERR_NAMETOOLONG,	-ENAMETOOLONG	},
	{ NFS4ERR_NOTEMPTY,	-ENOTEMPTY	},
	{ NFS4ERR_DQUOT,	-EDQUOT		},
	{ NFS4ERR_STALE,	-ESTALE		},
	{ NFS4ERR_BADHANDLE,	-EBADHANDLE	},
	{ NFS4ERR_BAD_COOKIE,	-EBADCOOKIE	},
	{ NFS4ERR_NOTSUPP,	-ENOTSUPP	},
	{ NFS4ERR_TOOSMALL,	-ETOOSMALL	},
	{ NFS4ERR_SERVERFAULT,	-EREMOTEIO	},
	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
	{ NFS4ERR_LOCKED,	-EAGAIN		},
	{ NFS4ERR_SYMLINK,	-ELOOP		},
	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
	{ NFS4ERR_NOXATTR,	-ENODATA	},
	{ NFS4ERR_XATTR2BIG,	-E2BIG		},
	{ -1,			-EIO		}
};


static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
		u32 seqnr)
{
	if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
		slot->seq_nr_highest_sent = seqnr;
}


static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
{
	__be32 *p;
	int status = 0;

	*maxname = 1024;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			return -EIO;
		*maxname = be32_to_cpup(p);
		bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
	}
	dprintk("%s: maxname=%u\n", __func__, *maxname);
	return status;
}


static bool nfs4_write_stateid_changed(struct rpc_task *task,
		struct nfs_pgio_args *args)
{

	if (!nfs4_error_stateid_expired(task->tk_status) ||
		nfs4_stateid_is_current(&args->stateid,
				args->context,
				args->lock_context,
				FMODE_WRITE))
		return false;
	rpc_restart_call_prepare(task);
	return true;
}


static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
				  struct rpc_message *msg,
				  struct rpc_clnt **clnt)
{
	struct nfs_server *server = NFS_SERVER(hdr->inode);

	if (!nfs4_write_need_cache_consistency_data(hdr)) {
		hdr->args.bitmask = NULL;
		hdr->res.fattr = NULL;
	} else
		hdr->args.bitmask = server->cache_consistency_bitmask;

	if (!hdr->pgio_done_cb)
		hdr->pgio_done_cb = nfs4_write_done_cb;
	hdr->res.server = server;
	hdr->timestamp   = jiffies;

	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
	nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
	nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
}


static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
		struct nfs_pathconf *pathconf)
{
	struct nfs4_pathconf_arg args = {
		.fh = fhandle,
		.bitmask = server->attr_bitmask,
	};
	struct nfs4_pathconf_res res = {
		.pathconf = pathconf,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};

	/* None of the pathconf attributes are mandatory to implement */
	if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
		memset(pathconf, 0, sizeof(*pathconf));
		return 0;
	}

	nfs_fattr_init(pathconf->fattr);
	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
}


static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
{
	struct nfs4_cached_acl *acl;
	size_t buflen = sizeof(*acl) + acl_len;

	if (buflen <= PAGE_SIZE) {
		acl = kmalloc(buflen, GFP_KERNEL);
		if (acl == NULL)
			goto out;
		acl->cached = 1;
		_copy_from_pages(acl->data, pages, pgbase, acl_len);
	} else {
		acl = kmalloc(sizeof(*acl), GFP_KERNEL);
		if (acl == NULL)
			goto out;
		acl->cached = 0;
	}
	acl->len = acl_len;
out:
	nfs4_set_cached_acl(inode, acl);
}


_nfs4_proc_getdeviceinfo(struct nfs_server *server,
		struct pnfs_device *pdev,
		const struct cred *cred)
{
	struct nfs4_getdeviceinfo_args args = {
		.pdev = pdev,
		.notify_types = NOTIFY_DEVICEID4_CHANGE |
			NOTIFY_DEVICEID4_DELETE,
	};
	struct nfs4_getdeviceinfo_res res = {
		.pdev = pdev,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
		.rpc_argp = &args,
		.rpc_resp = &res,
		.rpc_cred = cred,
	};
	int status;

	dprintk("--> %s\n", __func__);
	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
	if (res.notification & ~args.notify_types)
		dprintk("%s: unsupported notification\n", __func__);
	if (res.notification != args.notify_types)
		pdev->nocache = 1;

	dprintk("<-- %s status=%d\n", __func__, status);

	return status;
}


decode_restorefh(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_RESTOREFH);
}

struct compound_hdr

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}

static struct {
	int stat;
	int errno;
} nfs_errtbl[] = {
	{ NFS4_OK,		0		},
	{ NFS4ERR_PERM,		-EPERM		},
	{ NFS4ERR_NOENT,	-ENOENT		},
	{ NFS4ERR_IO,		-errno_NFSERR_IO},
	{ NFS4ERR_NXIO,		-ENXIO		},
	{ NFS4ERR_ACCESS,	-EACCES		},
	{ NFS4ERR_EXIST,	-EEXIST		},
	{ NFS4ERR_XDEV,		-EXDEV		},
	{ NFS4ERR_NOTDIR,	-ENOTDIR	},
	{ NFS4ERR_ISDIR,	-EISDIR		},
	{ NFS4ERR_INVAL,	-EINVAL		},
	{ NFS4ERR_FBIG,		-EFBIG		},
	{ NFS4ERR_NOSPC,	-ENOSPC		},
	{ NFS4ERR_ROFS,		-EROFS		},
	{ NFS4ERR_MLINK,	-EMLINK		},
	{ NFS4ERR_NAMETOOLONG,	-ENAMETOOLONG	},
	{ NFS4ERR_NOTEMPTY,	-ENOTEMPTY	},
	{ NFS4ERR_DQUOT,	-EDQUOT		},
	{ NFS4ERR_STALE,	-ESTALE		},
	{ NFS4ERR_BADHANDLE,	-EBADHANDLE	},
	{ NFS4ERR_BAD_COOKIE,	-EBADCOOKIE	},
	{ NFS4ERR_NOTSUPP,	-ENOTSUPP	},
	{ NFS4ERR_TOOSMALL,	-ETOOSMALL	},
	{ NFS4ERR_SERVERFAULT,	-EREMOTEIO	},
	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
	{ NFS4ERR_LOCKED,	-EAGAIN		},
	{ NFS4ERR_SYMLINK,	-ELOOP		},
	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
	{ NFS4ERR_NOXATTR,	-ENODATA	},
	{ NFS4ERR_XATTR2BIG,	-E2BIG		},
	{ -1,			-EIO		}
};


static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
			       void *data)
{
	struct nfs_renameres *res = data;
	struct compound_hdr hdr;
	int status;

	status = decode_compound_hdr(xdr, &hdr);
	if (status)
		goto out;
	status = decode_sequence(xdr, &res->seq_res, rqstp);
	if (status)
		goto out;
	status = decode_putfh(xdr);
	if (status)
		goto out;
	status = decode_savefh(xdr);
	if (status)
		goto out;
	status = decode_putfh(xdr);
	if (status)
		goto out;
	status = decode_rename(xdr, &res->old_cinfo, &res->new_cinfo);
out:
	return status;
}


int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
{
	struct nfs_commitargs args = {
		.offset = offset,
		.count = count,
	};
	struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
	struct nfs4_exception exception = { };
	int status;

	do {
		status = _nfs4_proc_commit(dst, &args, res);
		status = nfs4_handle_exception(dst_server, status, &exception);
	} while (exception.retry);

	return status;
}


nfs4_label_release_security(struct nfs4_label *label)
{ return; }


static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
{
	__be32 *p;

	encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
	encode_uint32(xdr, create->ftype);

	switch (create->ftype) {
	case NF4LNK:
		p = reserve_space(xdr, 4);
		*p = cpu_to_be32(create->u.symlink.len);
		xdr_write_pages(xdr, create->u.symlink.pages, 0,
				create->u.symlink.len);
		xdr->buf->flags |= XDRBUF_WRITE;
		break;

	case NF4BLK: case NF4CHR:
		p = reserve_space(xdr, 8);
		*p++ = cpu_to_be32(create->u.device.specdata1);
		*p = cpu_to_be32(create->u.device.specdata2);
		break;

	default:
		break;
	}

	encode_string(xdr, create->name->len, create->name->name);
	encode_attrs(xdr, create->attrs, create->label, &create->umask,
			create->server, create->server->attr_bitmask);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define encode_setclientid_maxsz \
				(op_encode_hdr_maxsz + \
				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
				/* client name */

#define decode_create_maxsz	(op_decode_hdr_maxsz + \
				decode_change_info_maxsz + \
				nfs4_fattr_bitmap_maxsz)

#define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
				encode_verifier_maxsz + \
				1 /* co_ownerid.len */

#define NFS4_dec_create_sz	(compound_decode_hdr_maxsz + \
				decode_sequence_maxsz + \
				decode_putfh_maxsz + \
				decode_create_maxsz + \
				decode_getfh_maxsz + \
				decode_getattr_maxsz)

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
{
	int retval;

	__decode_op_hdr(xdr, expected, &retval);
	return retval;
}


static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
				    struct dentry *unused, struct inode *inode,
				    const char *key, void *buf, size_t buflen)
{
	struct nfs_access_entry cache;
	ssize_t ret;

	if (!nfs_server_capable(inode, NFS_CAP_XATTR))
		return -EOPNOTSUPP;

	if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
		if (!(cache.mask & NFS_ACCESS_XAREAD))
			return -EACCES;
	}

	ret = nfs_revalidate_inode(NFS_SERVER(inode), inode);
	if (ret)
		return ret;

	ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
	if (ret >= 0 || (ret < 0 && ret != -ENOENT))
		return ret;

	ret = nfs42_proc_getxattr(inode, key, buf, buflen);

	return ret;
}


static int can_open_cached(struct nfs4_state *state, fmode_t mode,
		int open_mode, enum open_claim_type4 claim)
{
	int ret = 0;

	if (open_mode & (O_EXCL|O_TRUNC))
		goto out;
	switch (claim) {
	case NFS4_OPEN_CLAIM_NULL:
	case NFS4_OPEN_CLAIM_FH:
		goto out;
	default:
		break;
	}
	switch (mode & (FMODE_READ|FMODE_WRITE)) {
		case FMODE_READ:
			ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
				&& state->n_rdonly != 0;
			break;
		case FMODE_WRITE:
			ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
				&& state->n_wronly != 0;
			break;
		case FMODE_READ|FMODE_WRITE:
			ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
				&& state->n_rdwr != 0;
	}
out:
	return ret;
}


static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
				 const void *data)
{
	const struct nfs_setattrargs *args = data;
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_setattr(xdr, args, args->server, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}


static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
				     struct dentry *unused, struct inode *inode,
				     const char *key, void *buf, size_t buflen)
{
	if (security_ismaclabel(key))
		return nfs4_get_security_label(inode, buf, buflen);
	return -EOPNOTSUPP;
}


static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
				  const void *data)
{
	const struct nfs4_pathconf_arg *args = data;
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_getattr(xdr, nfs4_pathconf_bitmap, args->bitmask,
			ARRAY_SIZE(nfs4_pathconf_bitmap), &hdr);
	encode_nops(&hdr);
}


static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
{
	__be32 *p;

	if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			return -EIO;
		bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
		*res = -be32_to_cpup(p);
	}
	return 0;
}


static int _nfs4_proc_lookupp(struct inode *inode,
		struct nfs_fh *fhandle, struct nfs_fattr *fattr,
		struct nfs4_label *label)
{
	struct rpc_clnt *clnt = NFS_CLIENT(inode);
	struct nfs_server *server = NFS_SERVER(inode);
	int		       status;
	struct nfs4_lookupp_arg args = {
		.bitmask = server->attr_bitmask,
		.fh = NFS_FH(inode),
	};
	struct nfs4_lookupp_res res = {
		.server = server,
		.fattr = fattr,
		.label = label,
		.fh = fhandle,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};

	args.bitmask = nfs4_bitmask(server, label);

	nfs_fattr_init(fattr);

	dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
	status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
				&res.seq_res, 0);
	dprintk("NFS reply lookupp: %d\n", status);
	return status;
}


static inline uint64_t nfs4_lock_length(struct file_lock *fl)
{
	if (fl->fl_end == OFFSET_MAX)
		return ~(uint64_t)0;
	return fl->fl_end - fl->fl_start + 1;
}


static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
				   struct nfs_server *server,
				   struct rpc_message *msg,
				   struct nfs4_sequence_args *args,
				   struct nfs4_sequence_res *res)
{
	return nfs4_do_call_sync(clnt, server, msg, args, res, 0);
}


nfs4_update_changeattr_locked(struct inode *inode,
		struct nfs4_change_info *cinfo,
		unsigned long timestamp, unsigned long cache_validity)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	nfsi->cache_validity |= NFS_INO_INVALID_CTIME
		| NFS_INO_INVALID_MTIME
		| cache_validity;

	if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(inode)) {
		nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
		nfsi->attrtimeo_timestamp = jiffies;
	} else {
		if (S_ISDIR(inode->i_mode)) {
			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
			nfs_force_lookup_revalidate(inode);
		} else {
			if (!NFS_PROTO(inode)->have_delegation(inode,
							       FMODE_READ))
				nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
		}

		if (cinfo->before != inode_peek_iversion_raw(inode))
			nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
						NFS_INO_INVALID_ACL |
						NFS_INO_INVALID_XATTR;
	}
	inode_set_iversion_raw(inode, cinfo->after);
	nfsi->read_cache_jiffies = timestamp;
	nfsi->attr_gencount = nfs_inc_attr_generation_counter();
	nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;

	if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
		nfs_fscache_invalidate(inode);
}


static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
{
	if (!nfs4_sequence_done(task, &hdr->res.seq_res))
		return -EAGAIN;
	if (nfs4_write_stateid_changed(task, &hdr->args))
		return -EAGAIN;
	return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
		nfs4_write_done_cb(task, hdr);
}


static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
{
	return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))

#define decode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))

#define encode_setclientid_maxsz \
				(op_encode_hdr_maxsz + \
				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
				/* client name */

#define encode_setclientid_confirm_maxsz \
				(op_encode_hdr_maxsz + \
				3 + (NFS4_VERIFIER_SIZE >> 2))

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
		const nfs4_stateid *stateid)
{
	struct nfs4_state *state = lsp->ls_state;
	bool ret = false;

	spin_lock(&state->state_lock);
	if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
		goto out_noupdate;
	if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
		goto out_noupdate;
	nfs4_stateid_copy(&lsp->ls_stateid, stateid);
	ret = true;
out_noupdate:
	spin_unlock(&state->state_lock);
	return ret;
}


int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
{
	struct nfs_server *server = NFS_SERVER(inode);
	struct nfs4_exception exception = { };
	int err;
	do {
		err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
		trace_nfs4_delegreturn(inode, stateid, err);
		switch (err) {
			case -NFS4ERR_STALE_STATEID:
			case -NFS4ERR_EXPIRED:
			case 0:
				return 0;
		}
		err = nfs4_handle_exception(server, err, &exception);
	} while (exception.retry);
	return err;
}


static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
{
	int status;

	status = decode_op_hdr(xdr, OP_LOCK);
	if (status == -EIO)
		goto out;
	if (status == 0) {
		status = decode_lock_stateid(xdr, &res->stateid);
		if (unlikely(status))
			goto out;
	} else if (status == -NFS4ERR_DENIED)
		status = decode_lock_denied(xdr, NULL);
	if (res->open_seqid != NULL)
		nfs_increment_open_seqid(status, res->open_seqid);
	nfs_increment_lock_seqid(status, res->lock_seqid);
out:
	return status;
}


static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
{
	if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
		return;
	if (state->n_wronly)
		set_bit(NFS_O_WRONLY_STATE, &state->flags);
	if (state->n_rdonly)
		set_bit(NFS_O_RDONLY_STATE, &state->flags);
	if (state->n_rdwr)
		set_bit(NFS_O_RDWR_STATE, &state->flags);
	set_bit(NFS_OPEN_STATE, &state->flags);
}


nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
{
	struct nfs4_state *state;
	struct inode *inode;

	inode = nfs4_opendata_get_inode(data);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (data->state != NULL && data->state->inode == inode) {
		state = data->state;
		refcount_inc(&state->count);
	} else
		state = nfs4_get_open_state(inode, data->owner);
	iput(inode);
	if (state == NULL)
		state = ERR_PTR(-ENOMEM);
	return state;
}


static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
{
	struct nfs4_layoutget *lgp = calldata;

	dprintk("--> %s\n", __func__);
	nfs41_sequence_process(task, &lgp->res.seq_res);
	dprintk("<-- %s\n", __func__);
}


static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
				const void *data)
{
	const struct nfs_removeargs *args = data;
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_remove(xdr, &args->name, &hdr);
	encode_nops(&hdr);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define encode_setclientid_maxsz \
				(op_encode_hdr_maxsz + \
				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
				/* client name */

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
	encode_nfs4_seqid(xdr, arg->seqid);
	encode_nfs4_stateid(xdr, &arg->stateid);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define decode_close_maxsz	(op_decode_hdr_maxsz + \
				 decode_stateid_maxsz)

#define NFS4_dec_close_sz	(compound_decode_hdr_maxsz + \
				 decode_sequence_maxsz + \
				 decode_putfh_maxsz + \
				 decode_layoutreturn_maxsz + \
				 decode_close_maxsz + \
				 decode_getattr_maxsz)

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
{
	__be32 *p;
	int ret = 0;

	*type = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			return -EIO;
		*type = be32_to_cpup(p);
		if (*type < NF4REG || *type > NF4NAMEDATTR) {
			dprintk("%s: bad type %d\n", __func__, *type);
			return -EIO;
		}
		bitmap[0] &= ~FATTR4_WORD0_TYPE;
		ret = NFS_ATTR_FATTR_TYPE;
	}
	dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
	return ret;
}

#define errno_NFSERR_IO		EIO

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
				XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
				1 /* layout type */

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


nfs41_same_server_scope(struct nfs41_server_scope *a,
			struct nfs41_server_scope *b)
{
	if (a->server_scope_sz != b->server_scope_sz)
		return false;
	return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
}


static int decode_chan_attrs(struct xdr_stream *xdr,
			     struct nfs4_channel_attrs *attrs)
{
	__be32 *p;
	u32 nr_attrs, val;

	p = xdr_inline_decode(xdr, 28);
	if (unlikely(!p))
		return -EIO;
	val = be32_to_cpup(p++);	/* headerpadsz */
	if (val)
		return -EINVAL;		/* no support for header padding yet */
	attrs->max_rqst_sz = be32_to_cpup(p++);
	attrs->max_resp_sz = be32_to_cpup(p++);
	attrs->max_resp_sz_cached = be32_to_cpup(p++);
	attrs->max_ops = be32_to_cpup(p++);
	attrs->max_reqs = be32_to_cpup(p++);
	nr_attrs = be32_to_cpup(p);
	if (unlikely(nr_attrs > 1)) {
		printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
			"count %u\n", __func__, nr_attrs);
		return -EINVAL;
	}
	if (nr_attrs == 1) {
		p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
		if (unlikely(!p))
			return -EIO;
	}
	return 0;
}

#define errno_NFSERR_IO		EIO

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
{
	struct rpc_bind_conn_calldata data = {
		.clp = clp,
		.cred = cred,
	};
	return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
			nfs4_proc_bind_conn_to_session_callback, &data);
}

struct nfs4_opendata

static int _nfs4_recover_proc_open(struct nfs4_opendata *data);

static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);

static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);

static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);

static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs_open_context *ctx, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);

static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		const struct cred *cred,
		struct nfs4_slot *slot,
		bool is_privileged);

static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		const struct cred *);

static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
		const struct cred *, bool);

const u32 nfs4_fattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY
	| FATTR4_WORD1_MOUNTED_ON_FILEID,
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_pnfs_open_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY,
	FATTR4_WORD2_MDSTHRESHOLD
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	| FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_open_noattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_FILEID,
};

const u32 nfs4_statfs_bitmap[3] = {
	FATTR4_WORD0_FILES_AVAIL
	| FATTR4_WORD0_FILES_FREE
	| FATTR4_WORD0_FILES_TOTAL,
	FATTR4_WORD1_SPACE_AVAIL
	| FATTR4_WORD1_SPACE_FREE
	| FATTR4_WORD1_SPACE_TOTAL
};

const u32 nfs4_pathconf_bitmap[3] = {
	FATTR4_WORD0_MAXLINK
	| FATTR4_WORD0_MAXNAME,
	0
};


static int decode_renew(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_RENEW);
}


nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
{
	struct nfs4_state *ret;

	if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
		ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
	else
		ret = _nfs4_opendata_to_nfs4_state(data);
	nfs4_sequence_free_slot(&data->o_res.seq_res);
	return ret;
}


static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
{
	struct nfs4_delegreturndata *d_data;
	struct pnfs_layout_hdr *lo;

	d_data = (struct nfs4_delegreturndata *)data;

	if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
		nfs4_sequence_done(task, &d_data->res.seq_res);
		return;
	}

	lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
	if (lo && !pnfs_layout_is_valid(lo)) {
		d_data->args.lr_args = NULL;
		d_data->res.lr_res = NULL;
	}

	nfs4_setup_sequence(d_data->res.server->nfs_client,
			&d_data->args.seq_args,
			&d_data->res.seq_res,
			task);
}

struct nfs4_opendata

static int _nfs4_recover_proc_open(struct nfs4_opendata *data);

static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);

static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);

static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);

static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs_open_context *ctx, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);

static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		const struct cred *cred,
		struct nfs4_slot *slot,
		bool is_privileged);

static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		const struct cred *);

static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
		const struct cred *, bool);

static const u32 nfs4_pnfs_open_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY,
	FATTR4_WORD2_MDSTHRESHOLD
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	| FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_open_noattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_FILEID,
};

struct nfs4_call_sync_data {
	const struct nfs_server *seq_server;
	struct nfs4_sequence_args *seq_args;
	struct nfs4_sequence_res *seq_res;
}

static const struct rpc_call_ops nfs41_call_sync_ops = {
	.rpc_call_prepare = nfs41_call_sync_prepare,
	.rpc_call_done = nfs41_call_sync_done,
};

static const struct rpc_call_ops nfs40_call_sync_ops = {
	.rpc_call_prepare = nfs40_call_sync_prepare,
	.rpc_call_done = nfs40_call_sync_done,
};

struct nfs4_open_createattrs {
	struct nfs4_label *label;
	struct iattr *sattr;
	const __u32 verf[2];
}

static const struct rpc_call_ops nfs4_open_confirm_ops = {
	.rpc_call_prepare = nfs4_open_confirm_prepare,
	.rpc_call_done = nfs4_open_confirm_done,
	.rpc_release = nfs4_open_confirm_release,
};

static const struct rpc_call_ops nfs4_open_ops = {
	.rpc_call_prepare = nfs4_open_prepare,
	.rpc_call_done = nfs4_open_done,
	.rpc_release = nfs4_open_release,
};

struct nfs4_closedata {
	struct inode *inode;
	struct nfs4_state *state;
	struct nfs_closeargs arg;
	struct nfs_closeres res;
	struct {
		struct nfs4_layoutreturn_args arg;
		struct nfs4_layoutreturn_res res;
		struct nfs4_xdr_opaque_data ld_private;
		u32 roc_barrier;
		bool roc;
	} lr;
	struct nfs_fattr fattr;
	unsigned long timestamp;
}


static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
{
	struct rpc_task *task;
	int ret = 0;

	if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
		return -EAGAIN;
	task = _nfs41_proc_sequence(clp, cred, NULL, false);
	if (IS_ERR(task))
		ret = PTR_ERR(task);
	else
		rpc_put_task_async(task);
	dprintk("<-- %s status=%d\n", __func__, ret);
	return ret;
}


static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
{
	nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
			&data->args.seq_args,
			&data->res.seq_res,
			task);
}


static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
{
	__be32 *p;
	uint32_t savewords, bmlen, i;
	int status;

	if (!__decode_op_hdr(xdr, OP_OPEN, &status))
		return status;
	nfs_increment_open_seqid(status, res->seqid);
	if (status)
		return status;
	status = decode_open_stateid(xdr, &res->stateid);
	if (unlikely(status))
		return status;

	decode_change_info(xdr, &res->cinfo);

	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		return -EIO;
	res->rflags = be32_to_cpup(p++);
	bmlen = be32_to_cpup(p);
	if (bmlen > 10)
		goto xdr_error;

	p = xdr_inline_decode(xdr, bmlen << 2);
	if (unlikely(!p))
		return -EIO;
	savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
	for (i = 0; i < savewords; ++i)
		res->attrset[i] = be32_to_cpup(p++);
	for (; i < NFS4_BITMAP_SIZE; i++)
		res->attrset[i] = 0;

	return decode_delegation(xdr, res);
xdr_error:
	dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
	return -EIO;
}

#define errno_NFSERR_IO		EIO

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define NFS4_enc_compound_sz	(1024)  /* XXX: large enough? */

#define NFS4_dec_compound_sz	(1024)  /* XXX: large enough? */

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
{
	encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define encode_stateid_maxsz	(XDR_QUADLEN(NFS4_STATEID_SIZE))

#define decode_stateid_maxsz	(XDR_QUADLEN(NFS4_STATEID_SIZE))

#define encode_test_stateid_maxsz	(op_encode_hdr_maxsz + 2 + \
					 XDR_QUADLEN(NFS4_STATEID_SIZE))

#define encode_free_stateid_maxsz	(op_encode_hdr_maxsz + 1 + \
					 XDR_QUADLEN(NFS4_STATEID_SIZE))

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
				struct iattr *sattr, struct nfs4_label **label)
{
	const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
	__u32 attrset[3];
	unsigned ret;
	unsigned i;

	for (i = 0; i < ARRAY_SIZE(attrset); i++) {
		attrset[i] = opendata->o_res.attrset[i];
		if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
			attrset[i] &= ~bitmask[i];
	}

	ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
		sattr->ia_valid : 0;

	if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
		if (sattr->ia_valid & ATTR_ATIME_SET)
			ret |= ATTR_ATIME_SET;
		else
			ret |= ATTR_ATIME;
	}

	if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
		if (sattr->ia_valid & ATTR_MTIME_SET)
			ret |= ATTR_MTIME_SET;
		else
			ret |= ATTR_MTIME;
	}

	if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
		*label = NULL;
	return ret;
}

#define NFS4_VALID_ATTRS (ATTR_MODE \
	| ATTR_UID \
	| ATTR_GID \
	| ATTR_SIZE \
	| ATTR_ATIME \
	| ATTR_MTIME \
	| ATTR_CTIME \
	| ATTR_ATIME_SET \
	| ATTR_MTIME_SET)

struct nfs4_opendata

static int _nfs4_recover_proc_open(struct nfs4_opendata *data);

static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);

static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);

static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);

static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs_open_context *ctx, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);

static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		const struct cred *cred,
		struct nfs4_slot *slot,
		bool is_privileged);

static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		const struct cred *);

static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
		const struct cred *, bool);

const u32 nfs4_fattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY
	| FATTR4_WORD1_MOUNTED_ON_FILEID,
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_pnfs_open_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY,
	FATTR4_WORD2_MDSTHRESHOLD
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	| FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_open_noattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_FILEID,
};

const u32 nfs4_statfs_bitmap[3] = {
	FATTR4_WORD0_FILES_AVAIL
	| FATTR4_WORD0_FILES_FREE
	| FATTR4_WORD0_FILES_TOTAL,
	FATTR4_WORD1_SPACE_AVAIL
	| FATTR4_WORD1_SPACE_FREE
	| FATTR4_WORD1_SPACE_TOTAL
};


static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
	__be32 *p;
	int status = 0;

	*res = 1024;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
		uint64_t maxwrite;
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			return -EIO;
		xdr_decode_hyper(p, &maxwrite);
		if (maxwrite > 0x7FFFFFFF)
			maxwrite = 0x7FFFFFFF;
		*res = (uint32_t)maxwrite;
		bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
	}
	dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
	return status;
}


static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
	__be32 *p;

	p = reserve_space(xdr, 4);
	switch (arg->open_flags & O_CREAT) {
	case 0:
		*p = cpu_to_be32(NFS4_OPEN_NOCREATE);
		break;
	default:
		*p = cpu_to_be32(NFS4_OPEN_CREATE);
		encode_createmode(xdr, arg);
	}
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static int decode_getfattr_label(struct xdr_stream *xdr, struct nfs_fattr *fattr,
		struct nfs4_label *label, const struct nfs_server *server)
{
	return decode_getfattr_generic(xdr, fattr, NULL, NULL, label, server);
}


static size_t mask_bitmap4(const __u32 *bitmap, const __u32 *mask,
		__u32 *res, size_t len)
{
	size_t i;
	__u32 tmp;

	while (len > 0 && (bitmap[len-1] == 0 || mask[len-1] == 0))
		len--;
	for (i = len; i-- > 0;) {
		tmp = bitmap[i] & mask[i];
		res[i] = tmp;
	}
	return len;
}

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
				encode_verifier_maxsz + \
				1 /* co_ownerid.len */

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};


nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
{
	return nfs4_retry_setlk_simple(state, cmd, request);
}


static int decode_exchange_id(struct xdr_stream *xdr,
			      struct nfs41_exchange_id_res *res)
{
	__be32 *p;
	uint32_t dummy;
	char *dummy_str;
	int status;
	uint32_t impl_id_count;

	status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
	if (status)
		return status;

	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		return -EIO;
	xdr_decode_hyper(p, &res->clientid);
	p = xdr_inline_decode(xdr, 12);
	if (unlikely(!p))
		return -EIO;
	res->seqid = be32_to_cpup(p++);
	res->flags = be32_to_cpup(p++);

	res->state_protect.how = be32_to_cpup(p);
	switch (res->state_protect.how) {
	case SP4_NONE:
		break;
	case SP4_MACH_CRED:
		status = decode_op_map(xdr, &res->state_protect.enforce);
		if (status)
			return status;
		status = decode_op_map(xdr, &res->state_protect.allow);
		if (status)
			return status;
		break;
	default:
		WARN_ON_ONCE(1);
		return -EIO;
	}

	/* server_owner4.so_minor_id */
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		return -EIO;
	p = xdr_decode_hyper(p, &res->server_owner->minor_id);

	/* server_owner4.so_major_id */
	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
	if (unlikely(status))
		return status;
	memcpy(res->server_owner->major_id, dummy_str, dummy);
	res->server_owner->major_id_sz = dummy;

	/* server_scope4 */
	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
	if (unlikely(status))
		return status;
	memcpy(res->server_scope->server_scope, dummy_str, dummy);
	res->server_scope->server_scope_sz = dummy;

	/* Implementation Id */
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		return -EIO;
	impl_id_count = be32_to_cpup(p++);

	if (impl_id_count) {
		/* nii_domain */
		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
		if (unlikely(status))
			return status;
		memcpy(res->impl_id->domain, dummy_str, dummy);

		/* nii_name */
		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
		if (unlikely(status))
			return status;
		memcpy(res->impl_id->name, dummy_str, dummy);

		/* nii_date */
		p = xdr_inline_decode(xdr, 12);
		if (unlikely(!p))
			return -EIO;
		p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
		res->impl_id->date.nseconds = be32_to_cpup(p);

		/* if there's more than one entry, ignore the rest */
	}
	return 0;
}

#define errno_NFSERR_IO		EIO

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

#define encode_setclientid_maxsz \
				(op_encode_hdr_maxsz + \
				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
				/* client name */

#define decode_setclientid_maxsz \
				(op_decode_hdr_maxsz + \
				2 /* clientid */

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
			       const void *data)
{
	const struct nfs_closeargs *args = data;
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	if (args->lr_args)
		encode_layoutreturn(xdr, args->lr_args, &hdr);
	if (args->bitmask != NULL)
		encode_getfattr(xdr, args->bitmask, &hdr);
	encode_close(xdr, args, &hdr);
	encode_nops(&hdr);
}


static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
{
	struct page **pages;
	struct nfs_getaclargs args = {
		.fh = NFS_FH(inode),
		.acl_len = buflen,
	};
	struct nfs_getaclres res = {
		.acl_len = buflen,
	};
	struct rpc_message msg = {
		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
		.rpc_argp = &args,
		.rpc_resp = &res,
	};
	unsigned int npages;
	int ret = -ENOMEM, i;
	struct nfs_server *server = NFS_SERVER(inode);

	if (buflen == 0)
		buflen = server->rsize;

	npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
	pages = kmalloc_array(npages, sizeof(struct page *), GFP_NOFS);
	if (!pages)
		return -ENOMEM;

	args.acl_pages = pages;

	for (i = 0; i < npages; i++) {
		pages[i] = alloc_page(GFP_KERNEL);
		if (!pages[i])
			goto out_free;
	}

	/* for decoding across pages */
	res.acl_scratch = alloc_page(GFP_KERNEL);
	if (!res.acl_scratch)
		goto out_free;

	args.acl_len = npages * PAGE_SIZE;

	dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
		__func__, buf, buflen, npages, args.acl_len);
	ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
			     &msg, &args.seq_args, &res.seq_res, 0);
	if (ret)
		goto out_free;

	/* Handle the case where the passed-in buffer is too short */
	if (res.acl_flags & NFS4_ACL_TRUNC) {
		/* Did the user only issue a request for the acl length? */
		if (buf == NULL)
			goto out_ok;
		ret = -ERANGE;
		goto out_free;
	}
	nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
	if (buf) {
		if (res.acl_len > buflen) {
			ret = -ERANGE;
			goto out_free;
		}
		_copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
	}
out_ok:
	ret = res.acl_len;
out_free:
	for (i = 0; i < npages; i++)
		if (pages[i])
			__free_page(pages[i]);
	if (res.acl_scratch)
		__free_page(res.acl_scratch);
	kfree(pages);
	return ret;
}


static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
				const void *data)
{
	const struct nfs4_fsinfo_arg *args = data;
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_fsinfo(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}


static struct nfs4_state *nfs4_do_open(struct inode *dir,
					struct nfs_open_context *ctx,
					int flags,
					struct iattr *sattr,
					struct nfs4_label *label,
					int *opened)
{
	struct nfs_server *server = NFS_SERVER(dir);
	struct nfs4_exception exception = {
		.interruptible = true,
	};
	struct nfs4_state *res;
	struct nfs4_open_createattrs c = {
		.label = label,
		.sattr = sattr,
		.verf = {
			[0] = (__u32)jiffies,
			[1] = (__u32)current->pid,
		},
	};
	int status;

	do {
		status = _nfs4_do_open(dir, ctx, flags, &c, opened);
		res = ctx->state;
		trace_nfs4_open_file(ctx, flags, status);
		if (status == 0)
			break;
		/* NOTE: BAD_SEQID means the server and client disagree about the
		 * book-keeping w.r.t. state-changing operations
		 * (OPEN/CLOSE/LOCK/LOCKU...)
		 * It is actually a sign of a bug on the client or on the server.
		 *
		 * If we receive a BAD_SEQID error in the particular case of
		 * doing an OPEN, we assume that nfs_increment_open_seqid() will
		 * have unhashed the old state_owner for us, and that we can
		 * therefore safely retry using a new one. We should still warn
		 * the user though...
		 */
		if (status == -NFS4ERR_BAD_SEQID) {
			pr_warn_ratelimited("NFS: v4 server %s "
					" returned a bad sequence-id error!\n",
					NFS_SERVER(dir)->nfs_client->cl_hostname);
			exception.retry = 1;
			continue;
		}
		/*
		 * BAD_STATEID on OPEN means that the server cancelled our
		 * state before it received the OPEN_CONFIRM.
		 * Recover by retrying the request as per the discussion
		 * on Page 181 of RFC3530.
		 */
		if (status == -NFS4ERR_BAD_STATEID) {
			exception.retry = 1;
			continue;
		}
		if (status == -NFS4ERR_EXPIRED) {
			nfs4_schedule_lease_recovery(server->nfs_client);
			exception.retry = 1;
			continue;
		}
		if (status == -EAGAIN) {
			/* We must have found a delegation */
			exception.retry = 1;
			continue;
		}
		if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
			continue;
		res = ERR_PTR(nfs4_handle_exception(server,
					status, &exception));
	} while (exception.retry);
	return res;
}


static void nfs4_init_boot_verifier(const struct nfs_client *clp,
				    nfs4_verifier *bootverf)
{
	__be32 verf[2];

	if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
		/* An impossible timestamp guarantees this value
		 * will never match a generated boot time. */
		verf[0] = cpu_to_be32(U32_MAX);
		verf[1] = cpu_to_be32(U32_MAX);
	} else {
		struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
		u64 ns = ktime_to_ns(nn->boot_time);

		verf[0] = cpu_to_be32(ns >> 32);
		verf[1] = cpu_to_be32(ns);
	}
	memcpy(bootverf->data, verf, sizeof(bootverf->data));
}


encode_layoutget(struct xdr_stream *xdr,
		      const struct nfs4_layoutget_args *args,
		      struct compound_hdr *hdr)
{
}

struct compound_hdr

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				      compound_encode_hdr_maxsz +
				      encode_sequence_maxsz +
				      encode_putfh_maxsz +
				      encode_getattr_maxsz) *
				     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
				     compound_decode_hdr_maxsz +
				     decode_sequence_maxsz +
				     decode_putfh_maxsz) *
				    XDR_UNIT);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
					   compound_decode_hdr_maxsz +
					   decode_sequence_maxsz) *
					  XDR_UNIT);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}


static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
				    uint32_t *bitmap,
				    struct nfs4_threshold *res)
{
	__be32 *p;
	int status = 0;
	uint32_t num;

	if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
		return -EIO;
	if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
		/* Did the server return an unrequested attribute? */
		if (unlikely(res == NULL))
			return -EREMOTEIO;
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			return -EIO;
		num = be32_to_cpup(p);
		if (num == 0)
			return 0;
		if (num > 1)
			printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
				"drivers per filesystem not supported\n",
				__func__);

		status = decode_first_threshold_item4(xdr, res);
		bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
	}
	return status;
}


static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
		struct inode *inode)
{
	unsigned long cache_validity;

	memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
	if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
		return;

	cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
	if (!(cache_validity & NFS_INO_REVAL_FORCED))
		cache_validity &= ~(NFS_INO_INVALID_CHANGE
				| NFS_INO_INVALID_SIZE);

	if (!(cache_validity & NFS_INO_INVALID_SIZE))
		dst[0] &= ~FATTR4_WORD0_SIZE;

	if (!(cache_validity & NFS_INO_INVALID_CHANGE))
		dst[0] &= ~FATTR4_WORD0_CHANGE;
}

#define NFS4_BITMASK_SZ		3

struct nfs4_opendata

static int _nfs4_recover_proc_open(struct nfs4_opendata *data);

static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);

static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);

static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);

static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
			    struct nfs_fattr *fattr, struct iattr *sattr,
			    struct nfs_open_context *ctx, struct nfs4_label *ilabel,
			    struct nfs4_label *olabel);

static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
		const struct cred *cred,
		struct nfs4_slot *slot,
		bool is_privileged);

static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
		const struct cred *);

static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
		const struct cred *, bool);

const u32 nfs4_fattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY
	| FATTR4_WORD1_MOUNTED_ON_FILEID,
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_pnfs_open_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_CHANGE
	| FATTR4_WORD0_SIZE
	| FATTR4_WORD0_FSID
	| FATTR4_WORD0_FILEID,
	FATTR4_WORD1_MODE
	| FATTR4_WORD1_NUMLINKS
	| FATTR4_WORD1_OWNER
	| FATTR4_WORD1_OWNER_GROUP
	| FATTR4_WORD1_RAWDEV
	| FATTR4_WORD1_SPACE_USED
	| FATTR4_WORD1_TIME_ACCESS
	| FATTR4_WORD1_TIME_METADATA
	| FATTR4_WORD1_TIME_MODIFY,
	FATTR4_WORD2_MDSTHRESHOLD
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
	| FATTR4_WORD2_SECURITY_LABEL
#endif
};

static const u32 nfs4_open_noattr_bitmap[3] = {
	FATTR4_WORD0_TYPE
	| FATTR4_WORD0_FILEID,
};

const u32 nfs4_statfs_bitmap[3] = {
	FATTR4_WORD0_FILES_AVAIL
	| FATTR4_WORD0_FILES_FREE
	| FATTR4_WORD0_FILES_TOTAL,
	FATTR4_WORD1_SPACE_AVAIL
	| FATTR4_WORD1_SPACE_FREE
	| FATTR4_WORD1_SPACE_TOTAL
};

const u32 nfs4_pathconf_bitmap[3] = {
	FATTR4_WORD0_MAXLINK
	| FATTR4_WORD0_MAXNAME,
	0
};


static int decode_lookupp(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_LOOKUPP);
}

struct compound_hdr

static int nfs4_stat_to_errno(int);

static void encode_layoutget(struct xdr_stream *xdr,
			     const struct nfs4_layoutget_args *args,
			     struct compound_hdr *hdr);

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
			     struct nfs4_layoutget_res *res);

static const umode_t nfs_type2fmt[] = {
	[NF4BAD] = 0,
	[NF4REG] = S_IFREG,
	[NF4DIR] = S_IFDIR,
	[NF4BLK] = S_IFBLK,
	[NF4CHR] = S_IFCHR,
	[NF4LNK] = S_IFLNK,
	[NF4SOCK] = S_IFSOCK,
	[NF4FIFO] = S_IFIFO,
	[NF4ATTRDIR] = 0,
	[NF4NAMEDATTR] = 0,
};

struct compound_hdr {
	int32_t		status;
	uint32_t	nops;
	__be32 *	nops_p;
	uint32_t	taglen;
	char *		tag;
	uint32_t	replen;		/* expected reply words */
	u32		minorversion;
}

static struct {
	int stat;
	int errno;
} nfs_errtbl[] = {
	{ NFS4_OK,		0		},
	{ NFS4ERR_PERM,		-EPERM		},
	{ NFS4ERR_NOENT,	-ENOENT		},
	{ NFS4ERR_IO,		-errno_NFSERR_IO},
	{ NFS4ERR_NXIO,		-ENXIO		},
	{ NFS4ERR_ACCESS,	-EACCES		},
	{ NFS4ERR_EXIST,	-EEXIST		},
	{ NFS4ERR_XDEV,		-EXDEV		},
	{ NFS4ERR_NOTDIR,	-ENOTDIR	},
	{ NFS4ERR_ISDIR,	-EISDIR		},
	{ NFS4ERR_INVAL,	-EINVAL		},
	{ NFS4ERR_FBIG,		-EFBIG		},
	{ NFS4ERR_NOSPC,	-ENOSPC		},
	{ NFS4ERR_ROFS,		-EROFS		},
	{ NFS4ERR_MLINK,	-EMLINK		},
	{ NFS4ERR_NAMETOOLONG,	-ENAMETOOLONG	},
	{ NFS4ERR_NOTEMPTY,	-ENOTEMPTY	},
	{ NFS4ERR_DQUOT,	-EDQUOT		},
	{ NFS4ERR_STALE,	-ESTALE		},
	{ NFS4ERR_BADHANDLE,	-EBADHANDLE	},
	{ NFS4ERR_BAD_COOKIE,	-EBADCOOKIE	},
	{ NFS4ERR_NOTSUPP,	-ENOTSUPP	},
	{ NFS4ERR_TOOSMALL,	-ETOOSMALL	},
	{ NFS4ERR_SERVERFAULT,	-EREMOTEIO	},
	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
	{ NFS4ERR_LOCKED,	-EAGAIN		},
	{ NFS4ERR_SYMLINK,	-ELOOP		},
	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
	{ NFS4ERR_NOXATTR,	-ENODATA	},
	{ NFS4ERR_XATTR2BIG,	-E2BIG		},
	{ -1,			-EIO		}
};


static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
				   struct dentry *unused, struct inode *inode,
				   const char *key, const void *buf,
				   size_t buflen, int flags)
{
	return nfs4_proc_set_acl(inode, buf, buflen);
}