cregit-Linux how code gets into the kernel

Release 4.10 fs/nfsd/nfs4callback.c

Directory: fs/nfsd
/*
 *  Copyright (c) 2001 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *  Andy Adamson <andros@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/xprt.h>
#include <linux/sunrpc/svc_xprt.h>
#include <linux/slab.h>
#include "nfsd.h"
#include "state.h"
#include "netns.h"
#include "xdr4cb.h"


#define NFSDDBG_FACILITY                NFSDDBG_PROC

static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);


#define NFSPROC4_CB_NULL 0

#define NFSPROC4_CB_COMPOUND 1

/* Index of predefined Linux callback client operations */


struct nfs4_cb_compound_hdr {
	/* args */
	
u32		ident;	/* minorversion 0 only */
	
u32		nops;
	
__be32		*nops_p;
	
u32		minorversion;
	/* res */
	
int		status;
};

/*
 * Handle decode buffer overflows out-of-line.
 */



static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
	dprintk("NFS: %s prematurely hit the end of our receive buffer. "
		"Remaining buffer length is %tu words.\n",
		func, xdr->end - xdr->p);
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever33100.00%1100.00%


Total33100.00%1100.00%






static __be32 *xdr_encode_empty_array(__be32 *p)
{
	*p++ = xdr_zero;
	return p;
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever20100.00%1100.00%


Total20100.00%1100.00%



/*
 * Encode/decode NFSv4 CB basic data types
 *
 * Basic NFSv4 callback data types are defined in section 15 of RFC
 * 3530: "Network File System (NFS) version 4 Protocol" and section
 * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
 * 1 Protocol"
 */

/*
 *      nfs_cb_opnum4
 *
 *      enum nfs_cb_opnum4 {
 *              OP_CB_GETATTR           = 3,
 *                ...
 *      };
 */

enum nfs_cb_opnum4 {
	
OP_CB_GETATTR			= 3,
	
OP_CB_RECALL			= 4,
	
OP_CB_LAYOUTRECALL		= 5,
	
OP_CB_NOTIFY			= 6,
	
OP_CB_PUSH_DELEG		= 7,
	
OP_CB_RECALL_ANY		= 8,
	
OP_CB_RECALLABLE_OBJ_AVAIL	= 9,
	
OP_CB_RECALL_SLOT		= 10,
	
OP_CB_SEQUENCE			= 11,
	
OP_CB_WANTS_CANCELLED		= 12,
	
OP_CB_NOTIFY_LOCK		= 13,
	
OP_CB_NOTIFY_DEVICEID		= 14,
	
OP_CB_ILLEGAL			= 10044
};




static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, 4);
	*p = cpu_to_be32(op);
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever36100.00%1100.00%


Total36100.00%1100.00%



/*
 * nfs_fh4
 *
 *      typedef opaque nfs_fh4<NFS4_FHSIZE>;
 */



static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
{
	u32 length = fh->fh_size;
	__be32 *p;

	BUG_ON(length > NFS4_FHSIZE);
	p = xdr_reserve_space(xdr, 4 + length);
	xdr_encode_opaque(p, &fh->fh_base, length);
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever58100.00%1100.00%


Total58100.00%1100.00%



/*
 * stateid4
 *
 *      struct stateid4 {
 *              uint32_t        seqid;
 *              opaque          other[12];
 *      };
 */



static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
	*p++ = cpu_to_be32(sid->si_generation);
	xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever52100.00%1100.00%


Total52100.00%1100.00%



/*
 * sessionid4
 *
 *      typedef opaque sessionid4[NFS4_SESSIONID_SIZE];
 */



static void encode_sessionid4(struct xdr_stream *xdr,
			      const struct nfsd4_session *session)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
	xdr_encode_opaque_fixed(p, session->se_sessionid.data,
					NFS4_MAX_SESSIONID_LEN);
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever3683.72%120.00%


neil brownneil brown49.30%240.00%


andy adamsonandy adamson36.98%240.00%


Total43100.00%5100.00%



/*
 * nfsstat4
 */
static const struct {
	
int stat;
	
int errno;
} 
nfs_cb_errtbl[] = {
	{ NFS4_OK,		0		},
	{ NFS4ERR_PERM,		-EPERM		},
	{ NFS4ERR_NOENT,	-ENOENT		},
	{ NFS4ERR_IO,		-EIO		},
	{ 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,	-ESERVERFAULT	},
	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
	{ NFS4ERR_LOCKED,	-EAGAIN		},
	{ NFS4ERR_RESOURCE,	-EREMOTEIO	},
	{ NFS4ERR_SYMLINK,	-ELOOP		},
	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
	{ -1,			-EIO		}
};

/*
 * If we cannot translate the error, the recovery routines should
 * handle it.
 *
 * Note: remaining NFSv4 error codes have values > 10000, so should
 * not conflict with native Linux error codes.
 */



static int nfs_cb_stat_to_errno(int status)
{
	int i;

	for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
		if (nfs_cb_errtbl[i].stat == status)
			return nfs_cb_errtbl[i].errno;
	}

	dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
	return -status;
}


Contributors
PersonTokensPropCommitsCommitProp
neil brownneil brown4977.78%133.33%


chuck leverchuck lever1422.22%266.67%


Total63100.00%3100.00%






static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected,
			       int *status)
{
	__be32 *p;
	u32 op;

	p = xdr_inline_decode(xdr, 4 + 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	op = be32_to_cpup(p++);
	if (unlikely(op != expected))
		goto out_unexpected;
	*status = nfs_cb_stat_to_errno(be32_to_cpup(p));
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
out_unexpected:
	dprintk("NFSD: Callback server returned operation %d but "
		"we issued a request for %d\n", op, expected);
	return -EIO;
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever10391.96%250.00%


benny halevybenny halevy54.46%125.00%


christoph hellwigchristoph hellwig43.57%125.00%


Total112100.00%4100.00%



/*
 * CB_COMPOUND4args
 *
 *      struct CB_COMPOUND4args {
 *              utf8str_cs      tag;
 *              uint32_t        minorversion;
 *              uint32_t        callback_ident;
 *              nfs_cb_argop4   argarray<>;
 *      };
*/



static void encode_cb_compound4args(struct xdr_stream *xdr,
				    struct nfs4_cb_compound_hdr *hdr)
{
	__be32 * p;

	p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
	p = xdr_encode_empty_array(p);		/* empty tag */
	*p++ = cpu_to_be32(hdr->minorversion);
	*p++ = cpu_to_be32(hdr->ident);

	hdr->nops_p = p;
	*p = cpu_to_be32(hdr->nops);		/* argarray element count */
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever7692.68%266.67%


benny halevybenny halevy67.32%133.33%


Total82100.00%3100.00%



/*
 * Update argarray element count
 */



static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
{
	BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
	*hdr->nops_p = cpu_to_be32(hdr->nops);
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever2784.38%266.67%


benny halevybenny halevy515.62%133.33%


Total32100.00%3100.00%



/*
 * CB_COMPOUND4res
 *
 *      struct CB_COMPOUND4res {
 *              nfsstat4        status;
 *              utf8str_cs      tag;
 *              nfs_cb_resop4   resarray<>;
 *      };
 */



static int decode_cb_compound4res(struct xdr_stream *xdr,
				  struct nfs4_cb_compound_hdr *hdr)
{
	u32 length;
	__be32 *p;

	p = xdr_inline_decode(xdr, 4 + 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	hdr->status = be32_to_cpup(p++);
	/* Ignore the tag */
	length = be32_to_cpup(p++);
	p = xdr_inline_decode(xdr, length + 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	hdr->nops = be32_to_cpup(p);
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever8070.80%233.33%


neil brownneil brown2723.89%116.67%


andy adamsonandy adamson43.54%116.67%


al viroal viro10.88%116.67%


benny halevybenny halevy10.88%116.67%


Total113100.00%6100.00%



/*
 * CB_RECALL4args
 *
 *      struct CB_RECALL4args {
 *              stateid4        stateid;
 *              bool            truncate;
 *              nfs_fh4         fh;
 *      };
 */



static void encode_cb_recall4args(struct xdr_stream *xdr,
				  const struct nfs4_delegation *dp,
				  struct nfs4_cb_compound_hdr *hdr)
{
	__be32 *p;

	encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
	encode_stateid4(xdr, &dp->dl_stid.sc_stateid);

	p = xdr_reserve_space(xdr, 4);
	*p++ = xdr_zero;			/* truncate */

	encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle);

	hdr->nops++;
}


Contributors
PersonTokensPropCommitsCommitProp
neil brownneil brown2632.50%19.09%


chuck leverchuck lever2126.25%19.09%


andy adamsonandy adamson1215.00%19.09%


j. bruce fieldsj. bruce fields810.00%327.27%


benny halevybenny halevy78.75%218.18%


trond myklebusttrond myklebust33.75%19.09%


jeff laytonjeff layton22.50%19.09%


al viroal viro11.25%19.09%


Total80100.00%11100.00%



/*
 * CB_SEQUENCE4args
 *
 *      struct CB_SEQUENCE4args {
 *              sessionid4              csa_sessionid;
 *              sequenceid4             csa_sequenceid;
 *              slotid4                 csa_slotid;
 *              slotid4                 csa_highest_slotid;
 *              bool                    csa_cachethis;
 *              referring_call_list4    csa_referring_call_lists<>;
 *      };
 */



static void encode_cb_sequence4args(struct xdr_stream *xdr,
				    const struct nfsd4_callback *cb,
				    struct nfs4_cb_compound_hdr *hdr)
{
	struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
	__be32 *p;

	if (hdr->minorversion == 0)
		return;

	encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
	encode_sessionid4(xdr, session);

	p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
	*p++ = cpu_to_be32(session->se_cb_seq_nr);	/* csa_sequenceid */
	*p++ = xdr_zero;			/* csa_slotid */
	*p++ = xdr_zero;			/* csa_highest_slotid */
	*p++ = xdr_zero;			/* csa_cachethis */
	xdr_encode_empty_array(p);		/* csa_referring_call_lists */

	hdr->nops++;
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever5646.28%116.67%


benny halevybenny halevy5142.15%116.67%


j. bruce fieldsj. bruce fields1310.74%350.00%


neil brownneil brown10.83%116.67%


Total121100.00%6100.00%



/*
 * CB_SEQUENCE4resok
 *
 *      struct CB_SEQUENCE4resok {
 *              sessionid4      csr_sessionid;
 *              sequenceid4     csr_sequenceid;
 *              slotid4         csr_slotid;
 *              slotid4         csr_highest_slotid;
 *              slotid4         csr_target_highest_slotid;
 *      };
 *
 *      union CB_SEQUENCE4res switch (nfsstat4 csr_status) {
 *      case NFS4_OK:
 *              CB_SEQUENCE4resok       csr_resok4;
 *      default:
 *              void;
 *      };
 *
 * Our current back channel implmentation supports a single backchannel
 * with a single slot.
 */



static int decode_cb_sequence4resok(struct xdr_stream *xdr,
				    struct nfsd4_callback *cb)
{
	struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
	struct nfs4_sessionid id;
	int status;
	__be32 *p;
	u32 dummy;

	status = -ESERVERFAULT;

	/*
         * If the server returns different values for sessionID, slotID or
         * sequence number, the server is looney tunes.
         */
	p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
	if (unlikely(p == NULL))
		goto out_overflow;
	memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
	if (memcmp(id.data, session->se_sessionid.data,
					NFS4_MAX_SESSIONID_LEN) != 0) {
		dprintk("NFS: %s Invalid session id\n", __func__);
		goto out;
	}
	p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);

	dummy = be32_to_cpup(p++);
	if (dummy != session->se_cb_seq_nr) {
		dprintk("NFS: %s Invalid sequence number\n", __func__);
		goto out;
	}

	dummy = be32_to_cpup(p++);
	if (dummy != 0) {
		dprintk("NFS: %s Invalid slotid\n", __func__);
		goto out;
	}

	/*
         * FIXME: process highest slotid and target highest slotid
         */
	status = 0;
out:
	cb->cb_seq_status = status;
	return status;
out_overflow:
	print_overflow_msg(__func__, xdr);
	status = -EIO;
	goto out;
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever15271.70%110.00%


neil brownneil brown2411.32%220.00%


ricardo labiagaricardo labiaga115.19%110.00%


benny halevybenny halevy94.25%330.00%


kinglong meekinglong mee83.77%110.00%


andy adamsonandy adamson52.36%110.00%


j. bruce fieldsj. bruce fields31.42%110.00%


Total212100.00%10100.00%






static int decode_cb_sequence4res(struct xdr_stream *xdr,
				  struct nfsd4_callback *cb)
{
	int status;

	if (cb->cb_clp->cl_minorversion == 0)
		return 0;

	status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status);
	if (unlikely(status || cb->cb_seq_status))
		return status;

	return decode_cb_sequence4resok(xdr, cb);
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever3145.59%116.67%


neil brownneil brown2333.82%116.67%


christoph hellwigchristoph hellwig811.76%116.67%


jeff laytonjeff layton34.41%116.67%


kinglong meekinglong mee22.94%116.67%


j. bruce fieldsj. bruce fields11.47%116.67%


Total68100.00%6100.00%



/*
 * NFSv4.0 and NFSv4.1 XDR encode functions
 *
 * NFSv4.0 callback argument types are defined in section 15 of RFC
 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
 * of RFC 5661:  "Network File System (NFS) Version 4 Minor Version 1
 * Protocol".
 */

/*
 * NB: Without this zero space reservation, callbacks over krb5p fail
 */



static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
				 void *__unused)
{
	xdr_reserve_space(xdr, 0);
}


Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever1762.96%266.67%


neil brownneil brown1037.04%133.33%


Total27100.00%3100.00%



/*
 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
 */



static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
				   const struct nfsd4_callback *cb)
{
	const struct nfs4_delegation *dp = cb_to_delegation(cb);
	struct nfs4_cb_compound_hdr hdr = {
		.ident = cb->cb_clp->cl_cb_ident,
		.minorversion = cb->cb_clp->cl_minorversion,
        };

	encode_cb_compound4args(xdr, &hdr);
	encode_cb_sequence4args(xdr, cb, &hdr);
	encode_cb_recall4args(xdr, dp, &hdr);
	encode_cb_nops(&hdr);
}



Contributors
PersonTokensPropCommitsCommitProp
chuck leverchuck lever4852.75%225.00%


benny halevybenny halevy2931.87%112.50%


j. bruce fieldsj. bruce fields66.59%225.00%


jeff laytonjeff layton44.40%225.00%


christoph hellwigchristoph hellwig44.40%112.50%


Total91100.00%8100.00%



/*
 * NFSv4.0 and NFSv4.1 XDR decode functions
 *
 * NFSv4.0 callback result types are defined in section 15 of RFC
 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
 * of RFC 5661:  "Network File System (NFS) Version 4 Minor Version 1
 * Protocol".
 */




static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
				void *__unused)
{
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
neil brownneil brown1669.57%133.33%


chuck leverchuck lever730.43%266.67%


Total23100.00%3100.00%



/*
 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
 */



static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
				  struct xdr_stream *xdr,
				  struct nfsd4_callback *cb)
{
	struct nfs4_cb_compound_hdr hdr;
	int status;

	status = decode_cb_compound4res(xdr, &hdr);
	if (unlikely(status))
		return status;

	if (cb != NULL) {
		status = decode_cb_sequence4res(xdr, cb);
		if (unlikely(status || cb->cb_seq_status))
			return status;
	}

	return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status);
}


Contributors
PersonTokensPropCommitsCommitProp
neil brownneil brown3841.30%114.29%


ricardo labiagaricardo labiaga1819.57%114.29%


chuck leverchuck lever1819.57%228.57%


christoph hellwigchristoph hellwig1314.13%114.29%


j. bruce fieldsj. bruce fields44.35%114.29%


kinglong meekinglong mee11.09%114.29%


Total92100.00%7100.00%



#ifdef CONFIG_NFSD_PNFS
/*
 * CB_LAYOUTRECALL4args
 *
 *      struct layoutrecall_file4 {
 *              nfs_fh4         lor_fh;
 *              offset4         lor_offset;
 *              length4         lor_length;
 *              stateid4        lor_stateid;
 *      };
 *
 *      union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) {
 *      case LAYOUTRECALL4_FILE:
 *              layoutrecall_file4 lor_layout;
 *      case LAYOUTRECALL4_FSID:
 *              fsid4              lor_fsid;
 *      case LAYOUTRECALL4_ALL:
 *              void;
 *      };
 *
 *      struct CB_LAYOUTRECALL4args {
 *              layouttype4             clora_type;
 *              layoutiomode4           clora_iomode;
 *              bool                    clora_changed;
 *              layoutrecall4           clora_recall;
 *      };
 */



static void encode_cb_layout4args(struct xdr_stream *xdr,
				  const struct nfs4_layout_stateid *ls,
				  struct nfs4_cb_compound_hdr *hdr)
{
	__be32 *p;

	BUG_ON(hdr->minorversion == 0);

	p = xdr_reserve_space(xdr, 5 * 4);
	*p++ = cpu_to_be32(OP_CB_LAYOUTRECALL);
	*p++ = cpu_to_be32(ls->ls_layout_type);
	*p++ = cpu_to_be32(IOMODE_ANY);
	*p++ = cpu_to_be32(1);
	*p = cpu_to_be32(RETURN_FILE);

	encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle);

	p = xdr_reserve_space(xdr, 2 * 8);
	p = xdr_encode_hyper(p, 0);
	xdr_encode_hyper(p, NFS4_MAX_UINT64);

	encode_stateid4(xdr, &ls->ls_recall_sid);

	hdr->nops++;
}


Contributors
PersonTokensPropCommitsCommitProp
christoph hellwigchristoph hellwig148100.00%1100.00%


Total148100.00%1100.00%






static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
				   const struct nfsd4_callback *cb)
{
	const struct nfs4_layout_stateid *ls =
		container_of(cb, struct nfs4_layout_stateid, ls_recall);
	struct nfs4_cb_compound_hdr hdr = {
		.ident = 0,
		.minorversion = cb->cb_clp->cl_minorversion,
        };

	encode_cb_compound4args(xdr, &hdr);
	encode_cb_sequence4args(xdr, cb, &hdr);
	encode_cb_layout4args(xdr, ls, &hdr);
	encode_cb_nops(&hdr);
}


Contributors
PersonTokensPropCommitsCommitProp
christoph hellwigchristoph hellwig8996.74%150.00%


jeff laytonjeff layton33.26%150.00%


Total92100.00%2100.00%






static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp,
				  struct xdr_stream *xdr,
				  struct nfsd4_callback *cb)
{
	struct nfs4_cb_compound_hdr hdr;
	int status;

	status = decode_cb_compound4res(xdr, &hdr);
	if (unlikely(status))
		return status;

	if (cb) {
		status = decode_cb_sequence4res(xdr, cb);
		if (unlikely(status || cb->cb_seq_status))
			return status;
	}
	return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status);
}

Contributors
PersonTokensPropCommitsCommitProp
christoph hellwigchristoph hellwig8998.89%266.67%


kinglong meekinglong mee11.11%133.33%


Total90100.00%3100.00%



#endif /* CONFIG_NFSD_PNFS */




static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so)
{
	__be32	*p;

	p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len);
	p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8);
	xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len);
}


Contributors
PersonTokensPropCommitsCommitProp
jeff laytonjeff layton70100.00%1100.00%


Total70100.00%1100.00%






static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req,
					struct xdr_stream *xdr,
					const struct nfsd4_callback *cb)
{
	const struct nfsd4_blocked_lock *nbl =
		container_of(cb, struct nfsd4_blocked_lock, nbl_cb);
	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner;
	struct nfs4_cb_compound_hdr hdr = {
		.ident = 0,
		.minorversion = cb->cb_clp->cl_minorversion,
        };

	__be32 *p;

	BUG_ON(hdr.minorversion == 0);

	encode_cb_compound4args(xdr, &hdr);
	encode_cb_sequence4args(xdr, cb, &hdr);

	p = xdr_reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_CB_NOTIFY_LOCK);
	encode_nfs_fh4(xdr, &nbl->nbl_fh);
	encode_stateowner(xdr, &lo->lo_owner);
	hdr.nops++;

	encode_cb_nops(&hdr);
}


Contributors
PersonTokensPropCommitsCommitProp
jeff laytonjeff layton153100.00%1100.00%


Total153100.00%1100.00%






static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp,
					struct xdr_stream *xdr,
					struct nfsd4_callback *cb)
{
	struct nfs4_cb_compound_hdr hdr;
	int status;

	status = decode_cb_compound4res(xdr, &hdr);
	if (unlikely(status))
		return status;

	if (cb) {
		status = decode_cb_sequence4res(xdr, cb);
		if (unlikely(status || cb->cb_seq_status))
			return status;
	}
	return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status);
}


Contributors
PersonTokensPropCommitsCommitProp
jeff laytonjeff layton90100.00%1100.00%


Total90100.00%1100.00%



/*
 * RPC procedure tables
 */

#define PROC(proc, call, argtype, restype)				\
[NFSPROC4_CLNT_##proc] = {                                              \
        .p_proc    = NFSPROC4_CB_##call,                                \
        .p_encode  = (kxdreproc_t)nfs4_xdr_enc_##argtype,               \
        .p_decode  = (kxdrdproc_t)nfs4_xdr_dec_##restype,               \
        .p_arglen  = NFS4_enc_##argtype##_sz,                           \
        .p_replen  = NFS4_dec_##restype##_sz,                           \
        .p_statidx = NFSPROC4_CB_##call,                                \
        .p_name    = #proc,                                             \
}


static struct rpc_procinfo nfs4_cb_procedures[] = {
	PROC(CB_NULL,	NULL,		cb_null,	cb_null),
	PROC(CB_RECALL,	COMPOUND,	cb_recall,	cb_recall),
#ifdef CONFIG_NFSD_PNFS
	PROC(CB_LAYOUT,	COMPOUND,	cb_layout,	cb_layout),
#endif
	PROC(CB_NOTIFY_LOCK,	COMPOUND,	cb_notify_lock,	cb_notify_lock),
};


static struct rpc_version nfs_cb_version4 = {
/*
 * Note on the callback rpc program version number: despite language in rfc
 * 5661 section 18.36.3 requiring servers to use 4 in this field, the
 * official xdr descriptions for both 4.0 and 4.1 specify version 1, and
 * in practice that appears to be what implementations use.  The section
 * 18.36.3 language is expected to be fixed in an erratum.
 */
	.number			= 1,
	.nrprocs		= ARRAY_SIZE(nfs4_cb_procedures),
	.procs			= nfs4_cb_procedures
};


static const struct rpc_version *nfs_cb_version[] = {
	&nfs_cb_version4,
};


static const struct rpc_program cb_program;


static struct rpc_stat cb_stats = {
	.program		= &cb_program
};


#define NFS4_CALLBACK 0x40000000

static const struct rpc_program cb_program = {
	.name			= "nfs4_cb",
	.number			= NFS4_CALLBACK,
	.nrvers			= ARRAY_SIZE(nfs_cb_version),
	.version		= nfs_cb_version,
	.stats			= &cb_stats,
	.pipe_dir_name		= "nfsd4_cb",
};




static int max_cb_time(struct net *net)
{
	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
	return max(nn->nfsd4_lease/10, (time_t)1) * HZ;
}


Contributors
PersonTokensPropCommitsCommitProp
j. bruce fieldsj. bruce fields2255.00%266.67%


stanislav kinsburskystanislav kinsbursky1845.00%133.33%


Total40100.00%3100.00%




static struct rpc_cred *callback_cred;




int set_callback_cred(void)
{
	if (callback_cred)
		return 0;
	callback_cred = rpc_lookup_machine_cred("nfs");
	if (!callback_cred)
		return -ENOMEM;
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
j. bruce fieldsj. bruce fields33100.00%1100.00%


Total33100.00%1100.00%






static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
{
	if (clp->cl_minorversion == 0) {
		return get_rpccred(callback_cred);
	} else {
		struct rpc_auth *auth = client->cl_auth;
		struct auth_cred acred = {};

		acred.uid = ses->se_cb_sec.uid;
		acred.gid = ses->se_cb_sec.gid;
		return auth->au_ops->lookup_cred(client->cl_auth, &acred, 0);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
j. bruce fieldsj. bruce fields9398.94%150.00%


fengguang wufengguang wu11.06%150.00%


Total94100.00%2100.00%






static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
{
	int maxtime = max_cb_time(clp->net);
	struct rpc_timeout	timeparms = {
		.to_initval	= maxtime,
		.to_retries	= 0,
		.to_maxval	= maxtime,
        };
	struct rpc_create_args args = {
		.net		= clp->net,
		.address	= (struct sockaddr *) &conn->cb_addr,
		.addrsize	= conn->cb_addrlen,
		.saddress	= (struct sockaddr *) &conn->cb_saddr,
		.timeout	= &timeparms,
		.program	= &cb_program,