nfs4xdr.c 90.7 KB
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/*
 *  Server-side XDR for NFSv4
 *
 *  Copyright (c) 2002 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.
 *
 * TODO: Neil Brown made the following observation:  We currently
 * initially reserve NFSD_BUFSIZE space on the transmit queue and
 * never release any of that until the request is complete.
 * It would be good to calculate a new maximum response size while
 * decoding the COMPOUND, and call svc_reserve with this number
 * at the end of nfs4svc_decode_compoundargs.
 */

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#include <linux/slab.h>
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#include <linux/namei.h>
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#include <linux/statfs.h>
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#include <linux/utsname.h>
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#include <linux/pagemap.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include "idmap.h"
#include "acl.h"
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#include "xdr4.h"
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#include "vfs.h"
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#include "state.h"
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#include "cache.h"
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#define NFSDDBG_FACILITY		NFSDDBG_XDR

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/*
 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
 * directory in order to indicate to the client that a filesystem boundary is present
 * We use a fixed fsid for a referral
 */
#define NFS4_REFERRAL_FSID_MAJOR	0x8000000ULL
#define NFS4_REFERRAL_FSID_MINOR	0x8000000ULL

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static __be32
check_filename(char *str, int len, __be32 err)
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{
	int i;

	if (len == 0)
		return nfserr_inval;
	if (isdotent(str, len))
		return err;
	for (i = 0; i < len; i++)
		if (str[i] == '/')
			return err;
	return 0;
}

#define DECODE_HEAD				\
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	__be32 *p;				\
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	__be32 status
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#define DECODE_TAIL				\
	status = 0;				\
out:						\
	return status;				\
xdr_error:					\
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	dprintk("NFSD: xdr error (%s:%d)\n",	\
			__FILE__, __LINE__);	\
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	status = nfserr_bad_xdr;		\
	goto out

#define READ32(x)         (x) = ntohl(*p++)
#define READ64(x)         do {			\
	(x) = (u64)ntohl(*p++) << 32;		\
	(x) |= ntohl(*p++);			\
} while (0)
#define READTIME(x)       do {			\
	p++;					\
	(x) = ntohl(*p++);			\
	p++;					\
} while (0)
#define READMEM(x,nbytes) do {			\
	x = (char *)p;				\
	p += XDR_QUADLEN(nbytes);		\
} while (0)
#define SAVEMEM(x,nbytes) do {			\
	if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 		savemem(argp, p, nbytes) :	\
 		(char *)p)) {			\
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		dprintk("NFSD: xdr error (%s:%d)\n", \
				__FILE__, __LINE__); \
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		goto xdr_error;			\
		}				\
	p += XDR_QUADLEN(nbytes);		\
} while (0)
#define COPYMEM(x,nbytes) do {			\
	memcpy((x), p, nbytes);			\
	p += XDR_QUADLEN(nbytes);		\
} while (0)

/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
#define READ_BUF(nbytes)  do {			\
	if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {	\
		p = argp->p;			\
		argp->p += XDR_QUADLEN(nbytes);	\
	} else if (!(p = read_buf(argp, nbytes))) { \
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		dprintk("NFSD: xdr error (%s:%d)\n", \
				__FILE__, __LINE__); \
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		goto xdr_error;			\
	}					\
} while (0)

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static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
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{
	/* We want more bytes than seem to be available.
	 * Maybe we need a new page, maybe we have just run out
	 */
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	unsigned int avail = (char *)argp->end - (char *)argp->p;
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	__be32 *p;
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	if (avail + argp->pagelen < nbytes)
		return NULL;
	if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
		return NULL;
	/* ok, we can do it with the current plus the next page */
	if (nbytes <= sizeof(argp->tmp))
		p = argp->tmp;
	else {
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		kfree(argp->tmpp);
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		p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
		if (!p)
			return NULL;
		
	}
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	/*
	 * The following memcpy is safe because read_buf is always
	 * called with nbytes > avail, and the two cases above both
	 * guarantee p points to at least nbytes bytes.
	 */
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	memcpy(p, argp->p, avail);
	/* step to next page */
	argp->p = page_address(argp->pagelist[0]);
	argp->pagelist++;
	if (argp->pagelen < PAGE_SIZE) {
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		argp->end = argp->p + (argp->pagelen>>2);
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		argp->pagelen = 0;
	} else {
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		argp->end = argp->p + (PAGE_SIZE>>2);
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		argp->pagelen -= PAGE_SIZE;
	}
	memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
	argp->p += XDR_QUADLEN(nbytes - avail);
	return p;
}

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static int zero_clientid(clientid_t *clid)
{
	return (clid->cl_boot == 0) && (clid->cl_id == 0);
}

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static int
defer_free(struct nfsd4_compoundargs *argp,
		void (*release)(const void *), void *p)
{
	struct tmpbuf *tb;

	tb = kmalloc(sizeof(*tb), GFP_KERNEL);
	if (!tb)
		return -ENOMEM;
	tb->buf = p;
	tb->release = release;
	tb->next = argp->to_free;
	argp->to_free = tb;
	return 0;
}

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static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
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{
	if (p == argp->tmp) {
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		p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
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		if (!p)
			return NULL;
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	} else {
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		BUG_ON(p != argp->tmpp);
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		argp->tmpp = NULL;
	}
	if (defer_free(argp, kfree, p)) {
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		kfree(p);
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		return NULL;
	} else
		return (char *)p;
}

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static __be32
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nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
{
	u32 bmlen;
	DECODE_HEAD;

	bmval[0] = 0;
	bmval[1] = 0;
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	bmval[2] = 0;
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	READ_BUF(4);
	READ32(bmlen);
	if (bmlen > 1000)
		goto xdr_error;

	READ_BUF(bmlen << 2);
	if (bmlen > 0)
		READ32(bmval[0]);
	if (bmlen > 1)
		READ32(bmval[1]);
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	if (bmlen > 2)
		READ32(bmval[2]);
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	DECODE_TAIL;
}

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static __be32
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nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
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		   struct iattr *iattr, struct nfs4_acl **acl)
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{
	int expected_len, len = 0;
	u32 dummy32;
	char *buf;
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	int host_err;
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	DECODE_HEAD;
	iattr->ia_valid = 0;
	if ((status = nfsd4_decode_bitmap(argp, bmval)))
		return status;

	READ_BUF(4);
	READ32(expected_len);

	if (bmval[0] & FATTR4_WORD0_SIZE) {
		READ_BUF(8);
		len += 8;
		READ64(iattr->ia_size);
		iattr->ia_valid |= ATTR_SIZE;
	}
	if (bmval[0] & FATTR4_WORD0_ACL) {
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		int nace;
		struct nfs4_ace *ace;
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		READ_BUF(4); len += 4;
		READ32(nace);

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		if (nace > NFS4_ACL_MAX)
			return nfserr_resource;

		*acl = nfs4_acl_new(nace);
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		if (*acl == NULL) {
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			host_err = -ENOMEM;
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			goto out_nfserr;
		}
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		defer_free(argp, kfree, *acl);
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		(*acl)->naces = nace;
		for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
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			READ_BUF(16); len += 16;
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			READ32(ace->type);
			READ32(ace->flag);
			READ32(ace->access_mask);
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			READ32(dummy32);
			READ_BUF(dummy32);
			len += XDR_QUADLEN(dummy32) << 2;
			READMEM(buf, dummy32);
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			ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
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			status = nfs_ok;
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			if (ace->whotype != NFS4_ACL_WHO_NAMED)
				ace->who = 0;
			else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
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				status = nfsd_map_name_to_gid(argp->rqstp,
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						buf, dummy32, &ace->who);
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			else
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				status = nfsd_map_name_to_uid(argp->rqstp,
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						buf, dummy32, &ace->who);
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			if (status)
				return status;
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		}
	} else
		*acl = NULL;
	if (bmval[1] & FATTR4_WORD1_MODE) {
		READ_BUF(4);
		len += 4;
		READ32(iattr->ia_mode);
		iattr->ia_mode &= (S_IFMT | S_IALLUGO);
		iattr->ia_valid |= ATTR_MODE;
	}
	if (bmval[1] & FATTR4_WORD1_OWNER) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		READ_BUF(dummy32);
		len += (XDR_QUADLEN(dummy32) << 2);
		READMEM(buf, dummy32);
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		if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
			return status;
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		iattr->ia_valid |= ATTR_UID;
	}
	if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		READ_BUF(dummy32);
		len += (XDR_QUADLEN(dummy32) << 2);
		READMEM(buf, dummy32);
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		if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
			return status;
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		iattr->ia_valid |= ATTR_GID;
	}
	if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		switch (dummy32) {
		case NFS4_SET_TO_CLIENT_TIME:
			/* We require the high 32 bits of 'seconds' to be 0, and we ignore
			   all 32 bits of 'nseconds'. */
			READ_BUF(12);
			len += 12;
			READ32(dummy32);
			if (dummy32)
				return nfserr_inval;
			READ32(iattr->ia_atime.tv_sec);
			READ32(iattr->ia_atime.tv_nsec);
			if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
				return nfserr_inval;
			iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
			break;
		case NFS4_SET_TO_SERVER_TIME:
			iattr->ia_valid |= ATTR_ATIME;
			break;
		default:
			goto xdr_error;
		}
	}
	if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		switch (dummy32) {
		case NFS4_SET_TO_CLIENT_TIME:
			/* We require the high 32 bits of 'seconds' to be 0, and we ignore
			   all 32 bits of 'nseconds'. */
			READ_BUF(12);
			len += 12;
			READ32(dummy32);
			if (dummy32)
				return nfserr_inval;
			READ32(iattr->ia_mtime.tv_sec);
			READ32(iattr->ia_mtime.tv_nsec);
			if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
				return nfserr_inval;
			iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
			break;
		case NFS4_SET_TO_SERVER_TIME:
			iattr->ia_valid |= ATTR_MTIME;
			break;
		default:
			goto xdr_error;
		}
	}
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	if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
	    || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
	    || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
		READ_BUF(expected_len - len);
	else if (len != expected_len)
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		goto xdr_error;

	DECODE_TAIL;

out_nfserr:
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	status = nfserrno(host_err);
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	goto out;
}

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static __be32
nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
{
	DECODE_HEAD;

	READ_BUF(sizeof(stateid_t));
	READ32(sid->si_generation);
	COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));

	DECODE_TAIL;
}

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static __be32
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nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(access->ac_req_access);

	DECODE_TAIL;
}

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static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
{
	DECODE_HEAD;
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	u32 dummy, uid, gid;
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	char *machine_name;
	int i;
	int nr_secflavs;

	/* callback_sec_params4 */
	READ_BUF(4);
	READ32(nr_secflavs);
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	cbs->flavor = (u32)(-1);
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	for (i = 0; i < nr_secflavs; ++i) {
		READ_BUF(4);
		READ32(dummy);
		switch (dummy) {
		case RPC_AUTH_NULL:
			/* Nothing to read */
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			if (cbs->flavor == (u32)(-1))
				cbs->flavor = RPC_AUTH_NULL;
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			break;
		case RPC_AUTH_UNIX:
			READ_BUF(8);
			/* stamp */
			READ32(dummy);

			/* machine name */
			READ32(dummy);
			READ_BUF(dummy);
			SAVEMEM(machine_name, dummy);

			/* uid, gid */
			READ_BUF(8);
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			READ32(uid);
			READ32(gid);
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			/* more gids */
			READ_BUF(4);
			READ32(dummy);
			READ_BUF(dummy * 4);
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			if (cbs->flavor == (u32)(-1)) {
				cbs->uid = uid;
				cbs->gid = gid;
				cbs->flavor = RPC_AUTH_UNIX;
			}
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			break;
		case RPC_AUTH_GSS:
			dprintk("RPC_AUTH_GSS callback secflavor "
				"not supported!\n");
			READ_BUF(8);
			/* gcbp_service */
			READ32(dummy);
			/* gcbp_handle_from_server */
			READ32(dummy);
			READ_BUF(dummy);
			p += XDR_QUADLEN(dummy);
			/* gcbp_handle_from_client */
			READ_BUF(4);
			READ32(dummy);
			READ_BUF(dummy);
			break;
		default:
			dprintk("Illegal callback secflavor\n");
			return nfserr_inval;
		}
	}
	DECODE_TAIL;
}

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static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(bc->bc_cb_program);
	nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);

	DECODE_TAIL;
}

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static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
{
	DECODE_HEAD;

	READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
	COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
	READ32(bcts->dir);
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	/* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
	 * could help us figure out we should be using it. */
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	DECODE_TAIL;
}

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static __be32
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nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
{
	DECODE_HEAD;

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	READ_BUF(4);
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	READ32(close->cl_seqid);
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	return nfsd4_decode_stateid(argp, &close->cl_stateid);
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	DECODE_TAIL;
}


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static __be32
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nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
{
	DECODE_HEAD;

	READ_BUF(12);
	READ64(commit->co_offset);
	READ32(commit->co_count);

	DECODE_TAIL;
}

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static __be32
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nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(create->cr_type);
	switch (create->cr_type) {
	case NF4LNK:
		READ_BUF(4);
		READ32(create->cr_linklen);
		READ_BUF(create->cr_linklen);
		SAVEMEM(create->cr_linkname, create->cr_linklen);
		break;
	case NF4BLK:
	case NF4CHR:
		READ_BUF(8);
		READ32(create->cr_specdata1);
		READ32(create->cr_specdata2);
		break;
	case NF4SOCK:
	case NF4FIFO:
	case NF4DIR:
	default:
		break;
	}

	READ_BUF(4);
	READ32(create->cr_namelen);
	READ_BUF(create->cr_namelen);
	SAVEMEM(create->cr_name, create->cr_namelen);
	if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
		return status;

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	status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
				    &create->cr_acl);
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	if (status)
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		goto out;

	DECODE_TAIL;
}

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static inline __be32
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Linus Torvalds 已提交
585 586
nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
{
587
	return nfsd4_decode_stateid(argp, &dr->dr_stateid);
L
Linus Torvalds 已提交
588 589
}

590
static inline __be32
L
Linus Torvalds 已提交
591 592 593 594 595
nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
{
	return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
}

596
static __be32
L
Linus Torvalds 已提交
597 598 599 600 601 602 603 604 605 606 607 608 609 610
nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(link->li_namelen);
	READ_BUF(link->li_namelen);
	SAVEMEM(link->li_name, link->li_namelen);
	if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
		return status;

	DECODE_TAIL;
}

611
static __be32
L
Linus Torvalds 已提交
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628
nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
{
	DECODE_HEAD;

	/*
	* type, reclaim(boolean), offset, length, new_lock_owner(boolean)
	*/
	READ_BUF(28);
	READ32(lock->lk_type);
	if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
		goto xdr_error;
	READ32(lock->lk_reclaim);
	READ64(lock->lk_offset);
	READ64(lock->lk_length);
	READ32(lock->lk_is_new);

	if (lock->lk_is_new) {
629
		READ_BUF(4);
L
Linus Torvalds 已提交
630
		READ32(lock->lk_new_open_seqid);
631 632 633 634
		status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
		if (status)
			return status;
		READ_BUF(8 + sizeof(clientid_t));
L
Linus Torvalds 已提交
635 636 637 638 639 640
		READ32(lock->lk_new_lock_seqid);
		COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
		READ32(lock->lk_new_owner.len);
		READ_BUF(lock->lk_new_owner.len);
		READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
	} else {
641 642 643 644
		status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
		if (status)
			return status;
		READ_BUF(4);
L
Linus Torvalds 已提交
645 646 647 648 649 650
		READ32(lock->lk_old_lock_seqid);
	}

	DECODE_TAIL;
}

651
static __be32
L
Linus Torvalds 已提交
652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669
nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
{
	DECODE_HEAD;
		        
	READ_BUF(32);
	READ32(lockt->lt_type);
	if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
		goto xdr_error;
	READ64(lockt->lt_offset);
	READ64(lockt->lt_length);
	COPYMEM(&lockt->lt_clientid, 8);
	READ32(lockt->lt_owner.len);
	READ_BUF(lockt->lt_owner.len);
	READMEM(lockt->lt_owner.data, lockt->lt_owner.len);

	DECODE_TAIL;
}

670
static __be32
L
Linus Torvalds 已提交
671 672 673 674
nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
{
	DECODE_HEAD;

675
	READ_BUF(8);
L
Linus Torvalds 已提交
676 677 678 679
	READ32(locku->lu_type);
	if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
		goto xdr_error;
	READ32(locku->lu_seqid);
680 681 682 683
	status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
	if (status)
		return status;
	READ_BUF(16);
L
Linus Torvalds 已提交
684 685 686 687 688 689
	READ64(locku->lu_offset);
	READ64(locku->lu_length);

	DECODE_TAIL;
}

690
static __be32
L
Linus Torvalds 已提交
691 692 693 694 695 696 697 698 699 700 701 702 703 704
nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(lookup->lo_len);
	READ_BUF(lookup->lo_len);
	SAVEMEM(lookup->lo_name, lookup->lo_len);
	if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
		return status;

	DECODE_TAIL;
}

705
static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
706 707 708 709 710 711
{
	__be32 *p;
	u32 w;

	READ_BUF(4);
	READ32(w);
712 713 714 715 716
	*share_access = w & NFS4_SHARE_ACCESS_MASK;
	*deleg_want = w & NFS4_SHARE_WANT_MASK;
	if (deleg_when)
		*deleg_when = w & NFS4_SHARE_WHEN_MASK;

717 718 719 720 721 722 723 724
	switch (w & NFS4_SHARE_ACCESS_MASK) {
	case NFS4_SHARE_ACCESS_READ:
	case NFS4_SHARE_ACCESS_WRITE:
	case NFS4_SHARE_ACCESS_BOTH:
		break;
	default:
		return nfserr_bad_xdr;
	}
725
	w &= ~NFS4_SHARE_ACCESS_MASK;
726 727 728 729 730 731 732 733 734 735 736 737 738 739 740
	if (!w)
		return nfs_ok;
	if (!argp->minorversion)
		return nfserr_bad_xdr;
	switch (w & NFS4_SHARE_WANT_MASK) {
	case NFS4_SHARE_WANT_NO_PREFERENCE:
	case NFS4_SHARE_WANT_READ_DELEG:
	case NFS4_SHARE_WANT_WRITE_DELEG:
	case NFS4_SHARE_WANT_ANY_DELEG:
	case NFS4_SHARE_WANT_NO_DELEG:
	case NFS4_SHARE_WANT_CANCEL:
		break;
	default:
		return nfserr_bad_xdr;
	}
741
	w &= ~NFS4_SHARE_WANT_MASK;
742 743
	if (!w)
		return nfs_ok;
744 745 746

	if (!deleg_when)	/* open_downgrade */
		return nfserr_inval;
747 748 749
	switch (w) {
	case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
	case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
750 751
	case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
	      NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
752 753 754 755 756 757 758 759 760 761 762 763 764
		return nfs_ok;
	}
xdr_error:
	return nfserr_bad_xdr;
}

static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
{
	__be32 *p;

	READ_BUF(4);
	READ32(*x);
	/* Note: unlinke access bits, deny bits may be zero. */
765
	if (*x & ~NFS4_SHARE_DENY_BOTH)
766 767 768 769 770 771
		return nfserr_bad_xdr;
	return nfs_ok;
xdr_error:
	return nfserr_bad_xdr;
}

772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
{
	__be32 *p;

	READ_BUF(4);
	READ32(o->len);

	if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
		return nfserr_bad_xdr;

	READ_BUF(o->len);
	SAVEMEM(o->data, o->len);
	return nfs_ok;
xdr_error:
	return nfserr_bad_xdr;
}

789
static __be32
L
Linus Torvalds 已提交
790 791 792
nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
{
	DECODE_HEAD;
793
	u32 dummy;
L
Linus Torvalds 已提交
794 795 796

	memset(open->op_bmval, 0, sizeof(open->op_bmval));
	open->op_iattr.ia_valid = 0;
797
	open->op_openowner = NULL;
L
Linus Torvalds 已提交
798 799

	/* seqid, share_access, share_deny, clientid, ownerlen */
800
	READ_BUF(4);
L
Linus Torvalds 已提交
801
	READ32(open->op_seqid);
802 803 804
	/* decode, yet ignore deleg_when until supported */
	status = nfsd4_decode_share_access(argp, &open->op_share_access,
					   &open->op_deleg_want, &dummy);
805 806 807 808 809
	if (status)
		goto xdr_error;
	status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
	if (status)
		goto xdr_error;
810
	READ_BUF(sizeof(clientid_t));
L
Linus Torvalds 已提交
811
	COPYMEM(&open->op_clientid, sizeof(clientid_t));
812 813 814 815
	status = nfsd4_decode_opaque(argp, &open->op_owner);
	if (status)
		goto xdr_error;
	READ_BUF(4);
L
Linus Torvalds 已提交
816 817 818 819 820 821 822 823 824 825
	READ32(open->op_create);
	switch (open->op_create) {
	case NFS4_OPEN_NOCREATE:
		break;
	case NFS4_OPEN_CREATE:
		READ_BUF(4);
		READ32(open->op_createmode);
		switch (open->op_createmode) {
		case NFS4_CREATE_UNCHECKED:
		case NFS4_CREATE_GUARDED:
826
			status = nfsd4_decode_fattr(argp, open->op_bmval,
827
				&open->op_iattr, &open->op_acl);
828
			if (status)
L
Linus Torvalds 已提交
829 830 831
				goto out;
			break;
		case NFS4_CREATE_EXCLUSIVE:
832 833
			READ_BUF(NFS4_VERIFIER_SIZE);
			COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
834
			break;
B
Benny Halevy 已提交
835 836 837
		case NFS4_CREATE_EXCLUSIVE4_1:
			if (argp->minorversion < 1)
				goto xdr_error;
838 839
			READ_BUF(NFS4_VERIFIER_SIZE);
			COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
B
Benny Halevy 已提交
840
			status = nfsd4_decode_fattr(argp, open->op_bmval,
841
				&open->op_iattr, &open->op_acl);
B
Benny Halevy 已提交
842 843 844
			if (status)
				goto out;
			break;
L
Linus Torvalds 已提交
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
		default:
			goto xdr_error;
		}
		break;
	default:
		goto xdr_error;
	}

	/* open_claim */
	READ_BUF(4);
	READ32(open->op_claim_type);
	switch (open->op_claim_type) {
	case NFS4_OPEN_CLAIM_NULL:
	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
		READ_BUF(4);
		READ32(open->op_fname.len);
		READ_BUF(open->op_fname.len);
		SAVEMEM(open->op_fname.data, open->op_fname.len);
		if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
			return status;
		break;
	case NFS4_OPEN_CLAIM_PREVIOUS:
		READ_BUF(4);
		READ32(open->op_delegate_type);
		break;
	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
871 872 873 874
		status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
		if (status)
			return status;
		READ_BUF(4);
L
Linus Torvalds 已提交
875 876 877 878 879 880
		READ32(open->op_fname.len);
		READ_BUF(open->op_fname.len);
		SAVEMEM(open->op_fname.data, open->op_fname.len);
		if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
			return status;
		break;
881 882 883 884 885 886 887 888 889 890 891 892 893
	case NFS4_OPEN_CLAIM_FH:
	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
		if (argp->minorversion < 1)
			goto xdr_error;
		/* void */
		break;
	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
		if (argp->minorversion < 1)
			goto xdr_error;
		status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
		if (status)
			return status;
		break;
L
Linus Torvalds 已提交
894 895 896 897 898 899 900
	default:
		goto xdr_error;
	}

	DECODE_TAIL;
}

901
static __be32
L
Linus Torvalds 已提交
902 903 904 905
nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
{
	DECODE_HEAD;
		    
906 907 908 909
	status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
	if (status)
		return status;
	READ_BUF(4);
L
Linus Torvalds 已提交
910 911 912 913 914
	READ32(open_conf->oc_seqid);
						        
	DECODE_TAIL;
}

915
static __be32
L
Linus Torvalds 已提交
916 917 918 919
nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
{
	DECODE_HEAD;
		    
920 921 922
	status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
	if (status)
		return status;
923
	READ_BUF(4);
L
Linus Torvalds 已提交
924
	READ32(open_down->od_seqid);
925 926
	status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
					   &open_down->od_deleg_want, NULL);
927 928 929 930 931
	if (status)
		return status;
	status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
	if (status)
		return status;
L
Linus Torvalds 已提交
932 933 934
	DECODE_TAIL;
}

935
static __be32
L
Linus Torvalds 已提交
936 937 938 939 940 941 942 943 944 945 946 947 948 949
nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(putfh->pf_fhlen);
	if (putfh->pf_fhlen > NFS4_FHSIZE)
		goto xdr_error;
	READ_BUF(putfh->pf_fhlen);
	SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);

	DECODE_TAIL;
}

950
static __be32
L
Linus Torvalds 已提交
951 952 953 954
nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
{
	DECODE_HEAD;

955 956 957 958
	status = nfsd4_decode_stateid(argp, &read->rd_stateid);
	if (status)
		return status;
	READ_BUF(12);
L
Linus Torvalds 已提交
959 960 961 962 963 964
	READ64(read->rd_offset);
	READ32(read->rd_length);

	DECODE_TAIL;
}

965
static __be32
L
Linus Torvalds 已提交
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
{
	DECODE_HEAD;

	READ_BUF(24);
	READ64(readdir->rd_cookie);
	COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
	READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
	READ32(readdir->rd_maxcount);
	if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
		goto out;

	DECODE_TAIL;
}

981
static __be32
L
Linus Torvalds 已提交
982 983 984 985 986 987 988 989 990 991 992 993 994 995
nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(remove->rm_namelen);
	READ_BUF(remove->rm_namelen);
	SAVEMEM(remove->rm_name, remove->rm_namelen);
	if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
		return status;

	DECODE_TAIL;
}

996
static __be32
L
Linus Torvalds 已提交
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(rename->rn_snamelen);
	READ_BUF(rename->rn_snamelen + 4);
	SAVEMEM(rename->rn_sname, rename->rn_snamelen);
	READ32(rename->rn_tnamelen);
	READ_BUF(rename->rn_tnamelen);
	SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
	if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
		return status;
	if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
		return status;

	DECODE_TAIL;
}

1016
static __be32
L
Linus Torvalds 已提交
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
{
	DECODE_HEAD;

	READ_BUF(sizeof(clientid_t));
	COPYMEM(clientid, sizeof(clientid_t));

	DECODE_TAIL;
}

A
Andy Adamson 已提交
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
static __be32
nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
		     struct nfsd4_secinfo *secinfo)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(secinfo->si_namelen);
	READ_BUF(secinfo->si_namelen);
	SAVEMEM(secinfo->si_name, secinfo->si_namelen);
	status = check_filename(secinfo->si_name, secinfo->si_namelen,
								nfserr_noent);
	if (status)
		return status;
	DECODE_TAIL;
}

J
J. Bruce Fields 已提交
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
static __be32
nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
		     struct nfsd4_secinfo_no_name *sin)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(sin->sin_style);
	DECODE_TAIL;
}

1055
static __be32
L
Linus Torvalds 已提交
1056 1057
nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
{
1058
	__be32 status;
L
Linus Torvalds 已提交
1059

1060 1061 1062
	status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
	if (status)
		return status;
1063 1064
	return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
				  &setattr->sa_acl);
L
Linus Torvalds 已提交
1065 1066
}

1067
static __be32
L
Linus Torvalds 已提交
1068 1069 1070 1071
nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
{
	DECODE_HEAD;

1072 1073
	READ_BUF(NFS4_VERIFIER_SIZE);
	COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
1074

1075 1076 1077 1078
	status = nfsd4_decode_opaque(argp, &setclientid->se_name);
	if (status)
		return nfserr_bad_xdr;
	READ_BUF(8);
L
Linus Torvalds 已提交
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
	READ32(setclientid->se_callback_prog);
	READ32(setclientid->se_callback_netid_len);

	READ_BUF(setclientid->se_callback_netid_len + 4);
	SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
	READ32(setclientid->se_callback_addr_len);

	READ_BUF(setclientid->se_callback_addr_len + 4);
	SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
	READ32(setclientid->se_callback_ident);

	DECODE_TAIL;
}

1093
static __be32
L
Linus Torvalds 已提交
1094 1095 1096 1097
nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
{
	DECODE_HEAD;

1098
	READ_BUF(8 + NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
1099
	COPYMEM(&scd_c->sc_clientid, 8);
1100
	COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
1101 1102 1103 1104 1105

	DECODE_TAIL;
}

/* Also used for NVERIFY */
1106
static __be32
L
Linus Torvalds 已提交
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
{
#if 0
	struct nfsd4_compoundargs save = {
		.p = argp->p,
		.end = argp->end,
		.rqstp = argp->rqstp,
	};
	u32             ve_bmval[2];
	struct iattr    ve_iattr;           /* request */
	struct nfs4_acl *ve_acl;            /* request */
#endif
	DECODE_HEAD;

	if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
		goto out;

	/* For convenience's sake, we compare raw xdr'd attributes in
	 * nfsd4_proc_verify; however we still decode here just to return
	 * correct error in case of bad xdr. */
#if 0
	status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
	if (status == nfserr_inval) {
		status = nfserrno(status);
		goto out;
	}
#endif
	READ_BUF(4);
	READ32(verify->ve_attrlen);
	READ_BUF(verify->ve_attrlen);
	SAVEMEM(verify->ve_attrval, verify->ve_attrlen);

	DECODE_TAIL;
}

J
J. Bruce Fields 已提交
1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
static int fill_in_write_vector(struct kvec *vec, struct kvec *head, struct page **pagelist, int buflen)
{
	int i = 1;

	vec[0].iov_base = head->iov_base;
	vec[0].iov_len = min_t(int, buflen, head->iov_len);
	buflen -= vec[0].iov_len;

	while (buflen) {
		vec[i].iov_base = page_address(pagelist[i - 1]);
		vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
		buflen -= vec[i].iov_len;
		i++;
	}
	return i;
}

1159
static __be32
L
Linus Torvalds 已提交
1160 1161 1162 1163
nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
{
	int avail;
	int len;
J
J. Bruce Fields 已提交
1164 1165
	struct page **pagelist;
	struct kvec head;
L
Linus Torvalds 已提交
1166 1167
	DECODE_HEAD;

1168 1169 1170 1171
	status = nfsd4_decode_stateid(argp, &write->wr_stateid);
	if (status)
		return status;
	READ_BUF(16);
L
Linus Torvalds 已提交
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
	READ64(write->wr_offset);
	READ32(write->wr_stable_how);
	if (write->wr_stable_how > 2)
		goto xdr_error;
	READ32(write->wr_buflen);

	/* Sorry .. no magic macros for this.. *
	 * READ_BUF(write->wr_buflen);
	 * SAVEMEM(write->wr_buf, write->wr_buflen);
	 */
	avail = (char*)argp->end - (char*)argp->p;
	if (avail + argp->pagelen < write->wr_buflen) {
1184 1185
		dprintk("NFSD: xdr error (%s:%d)\n",
				__FILE__, __LINE__);
L
Linus Torvalds 已提交
1186 1187
		goto xdr_error;
	}
J
J. Bruce Fields 已提交
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
	head.iov_base = p;
	head.iov_len = avail;
	WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
	pagelist = argp->pagelist;

	len = XDR_QUADLEN(write->wr_buflen) << 2;
	if (len >= avail) {
		int pages;

		len -= avail;

		pages = len >> PAGE_SHIFT;
		argp->pagelist += pages;
		argp->pagelen -= pages * PAGE_SIZE;
		len -= pages * PAGE_SIZE;

		argp->p = (__be32 *)page_address(argp->pagelist[0]);
		argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
L
Linus Torvalds 已提交
1206
	}
J
J. Bruce Fields 已提交
1207 1208 1209 1210
	argp->p += XDR_QUADLEN(len);
	write->wr_vlen = fill_in_write_vector(argp->rqstp->rq_vec,
		&head, pagelist, write->wr_buflen);
	WARN_ON_ONCE(write->wr_vlen > ARRAY_SIZE(argp->rqstp->rq_vec));
L
Linus Torvalds 已提交
1211 1212 1213 1214

	DECODE_TAIL;
}

1215
static __be32
L
Linus Torvalds 已提交
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
{
	DECODE_HEAD;

	READ_BUF(12);
	COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
	READ32(rlockowner->rl_owner.len);
	READ_BUF(rlockowner->rl_owner.len);
	READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);

A
Andy Adamson 已提交
1226 1227
	if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
		return nfserr_inval;
L
Linus Torvalds 已提交
1228 1229 1230
	DECODE_TAIL;
}

A
Andy Adamson 已提交
1231 1232
static __be32
nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
A
Andy Adamson 已提交
1233
			 struct nfsd4_exchange_id *exid)
A
Andy Adamson 已提交
1234
{
1235
	int dummy, tmp;
A
Andy Adamson 已提交
1236 1237 1238 1239 1240
	DECODE_HEAD;

	READ_BUF(NFS4_VERIFIER_SIZE);
	COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);

1241 1242 1243
	status = nfsd4_decode_opaque(argp, &exid->clname);
	if (status)
		return nfserr_bad_xdr;
A
Andy Adamson 已提交
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280

	READ_BUF(4);
	READ32(exid->flags);

	/* Ignore state_protect4_a */
	READ_BUF(4);
	READ32(exid->spa_how);
	switch (exid->spa_how) {
	case SP4_NONE:
		break;
	case SP4_MACH_CRED:
		/* spo_must_enforce */
		READ_BUF(4);
		READ32(dummy);
		READ_BUF(dummy * 4);
		p += dummy;

		/* spo_must_allow */
		READ_BUF(4);
		READ32(dummy);
		READ_BUF(dummy * 4);
		p += dummy;
		break;
	case SP4_SSV:
		/* ssp_ops */
		READ_BUF(4);
		READ32(dummy);
		READ_BUF(dummy * 4);
		p += dummy;

		READ_BUF(4);
		READ32(dummy);
		READ_BUF(dummy * 4);
		p += dummy;

		/* ssp_hash_algs<> */
		READ_BUF(4);
1281 1282 1283 1284 1285 1286 1287
		READ32(tmp);
		while (tmp--) {
			READ_BUF(4);
			READ32(dummy);
			READ_BUF(dummy);
			p += XDR_QUADLEN(dummy);
		}
A
Andy Adamson 已提交
1288 1289 1290

		/* ssp_encr_algs<> */
		READ_BUF(4);
1291 1292 1293 1294 1295 1296 1297
		READ32(tmp);
		while (tmp--) {
			READ_BUF(4);
			READ32(dummy);
			READ_BUF(dummy);
			p += XDR_QUADLEN(dummy);
		}
A
Andy Adamson 已提交
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332

		/* ssp_window and ssp_num_gss_handles */
		READ_BUF(8);
		READ32(dummy);
		READ32(dummy);
		break;
	default:
		goto xdr_error;
	}

	/* Ignore Implementation ID */
	READ_BUF(4);    /* nfs_impl_id4 array length */
	READ32(dummy);

	if (dummy > 1)
		goto xdr_error;

	if (dummy == 1) {
		/* nii_domain */
		READ_BUF(4);
		READ32(dummy);
		READ_BUF(dummy);
		p += XDR_QUADLEN(dummy);

		/* nii_name */
		READ_BUF(4);
		READ32(dummy);
		READ_BUF(dummy);
		p += XDR_QUADLEN(dummy);

		/* nii_date */
		READ_BUF(12);
		p += 3;
	}
	DECODE_TAIL;
A
Andy Adamson 已提交
1333 1334 1335 1336 1337 1338
}

static __be32
nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
			    struct nfsd4_create_session *sess)
{
A
Andy Adamson 已提交
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380
	DECODE_HEAD;
	u32 dummy;

	READ_BUF(16);
	COPYMEM(&sess->clientid, 8);
	READ32(sess->seqid);
	READ32(sess->flags);

	/* Fore channel attrs */
	READ_BUF(28);
	READ32(dummy); /* headerpadsz is always 0 */
	READ32(sess->fore_channel.maxreq_sz);
	READ32(sess->fore_channel.maxresp_sz);
	READ32(sess->fore_channel.maxresp_cached);
	READ32(sess->fore_channel.maxops);
	READ32(sess->fore_channel.maxreqs);
	READ32(sess->fore_channel.nr_rdma_attrs);
	if (sess->fore_channel.nr_rdma_attrs == 1) {
		READ_BUF(4);
		READ32(sess->fore_channel.rdma_attrs);
	} else if (sess->fore_channel.nr_rdma_attrs > 1) {
		dprintk("Too many fore channel attr bitmaps!\n");
		goto xdr_error;
	}

	/* Back channel attrs */
	READ_BUF(28);
	READ32(dummy); /* headerpadsz is always 0 */
	READ32(sess->back_channel.maxreq_sz);
	READ32(sess->back_channel.maxresp_sz);
	READ32(sess->back_channel.maxresp_cached);
	READ32(sess->back_channel.maxops);
	READ32(sess->back_channel.maxreqs);
	READ32(sess->back_channel.nr_rdma_attrs);
	if (sess->back_channel.nr_rdma_attrs == 1) {
		READ_BUF(4);
		READ32(sess->back_channel.rdma_attrs);
	} else if (sess->back_channel.nr_rdma_attrs > 1) {
		dprintk("Too many back channel attr bitmaps!\n");
		goto xdr_error;
	}

1381
	READ_BUF(4);
A
Andy Adamson 已提交
1382
	READ32(sess->callback_prog);
1383
	nfsd4_decode_cb_sec(argp, &sess->cb_sec);
A
Andy Adamson 已提交
1384
	DECODE_TAIL;
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1385 1386 1387 1388 1389 1390
}

static __be32
nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
			     struct nfsd4_destroy_session *destroy_session)
{
B
Benny Halevy 已提交
1391 1392 1393 1394 1395
	DECODE_HEAD;
	READ_BUF(NFS4_MAX_SESSIONID_LEN);
	COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);

	DECODE_TAIL;
A
Andy Adamson 已提交
1396 1397
}

1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410
static __be32
nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
			  struct nfsd4_free_stateid *free_stateid)
{
	DECODE_HEAD;

	READ_BUF(sizeof(stateid_t));
	READ32(free_stateid->fr_stateid.si_generation);
	COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));

	DECODE_TAIL;
}

A
Andy Adamson 已提交
1411 1412 1413 1414
static __be32
nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
		      struct nfsd4_sequence *seq)
{
B
Benny Halevy 已提交
1415 1416 1417 1418 1419 1420 1421 1422 1423 1424
	DECODE_HEAD;

	READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
	COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
	READ32(seq->seqid);
	READ32(seq->slotid);
	READ32(seq->maxslots);
	READ32(seq->cachethis);

	DECODE_TAIL;
A
Andy Adamson 已提交
1425 1426
}

1427 1428 1429 1430
static __be32
nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
{
	int i;
1431 1432
	__be32 *p, status;
	struct nfsd4_test_stateid_id *stateid;
1433 1434 1435 1436

	READ_BUF(4);
	test_stateid->ts_num_ids = ntohl(*p++);

1437
	INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1438 1439

	for (i = 0; i < test_stateid->ts_num_ids; i++) {
1440 1441
		stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
		if (!stateid) {
1442
			status = nfserrno(-ENOMEM);
1443 1444 1445 1446 1447 1448 1449 1450
			goto out;
		}

		defer_free(argp, kfree, stateid);
		INIT_LIST_HEAD(&stateid->ts_id_list);
		list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);

		status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1451
		if (status)
1452
			goto out;
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463
	}

	status = 0;
out:
	return status;
xdr_error:
	dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
	status = nfserr_bad_xdr;
	goto out;
}

1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
{
	DECODE_HEAD;

	READ_BUF(8);
	COPYMEM(&dc->clientid, 8);

	DECODE_TAIL;
}

1474 1475 1476 1477 1478 1479 1480 1481 1482 1483
static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(rc->rca_one_fs);

	DECODE_TAIL;
}

1484 1485 1486 1487 1488 1489
static __be32
nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
{
	return nfs_ok;
}

1490 1491 1492
static __be32
nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
{
1493
	return nfserr_notsupp;
1494 1495
}

1496 1497 1498
typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);

static nfsd4_dec nfsd4_dec_ops[] = {
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
	[OP_ACCESS]		= (nfsd4_dec)nfsd4_decode_access,
	[OP_CLOSE]		= (nfsd4_dec)nfsd4_decode_close,
	[OP_COMMIT]		= (nfsd4_dec)nfsd4_decode_commit,
	[OP_CREATE]		= (nfsd4_dec)nfsd4_decode_create,
	[OP_DELEGPURGE]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_DELEGRETURN]	= (nfsd4_dec)nfsd4_decode_delegreturn,
	[OP_GETATTR]		= (nfsd4_dec)nfsd4_decode_getattr,
	[OP_GETFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_LINK]		= (nfsd4_dec)nfsd4_decode_link,
	[OP_LOCK]		= (nfsd4_dec)nfsd4_decode_lock,
	[OP_LOCKT]		= (nfsd4_dec)nfsd4_decode_lockt,
	[OP_LOCKU]		= (nfsd4_dec)nfsd4_decode_locku,
	[OP_LOOKUP]		= (nfsd4_dec)nfsd4_decode_lookup,
	[OP_LOOKUPP]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_NVERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
	[OP_OPEN]		= (nfsd4_dec)nfsd4_decode_open,
	[OP_OPENATTR]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_OPEN_CONFIRM]	= (nfsd4_dec)nfsd4_decode_open_confirm,
	[OP_OPEN_DOWNGRADE]	= (nfsd4_dec)nfsd4_decode_open_downgrade,
	[OP_PUTFH]		= (nfsd4_dec)nfsd4_decode_putfh,
1519
	[OP_PUTPUBFH]		= (nfsd4_dec)nfsd4_decode_noop,
1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
	[OP_PUTROOTFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_READ]		= (nfsd4_dec)nfsd4_decode_read,
	[OP_READDIR]		= (nfsd4_dec)nfsd4_decode_readdir,
	[OP_READLINK]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_REMOVE]		= (nfsd4_dec)nfsd4_decode_remove,
	[OP_RENAME]		= (nfsd4_dec)nfsd4_decode_rename,
	[OP_RENEW]		= (nfsd4_dec)nfsd4_decode_renew,
	[OP_RESTOREFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_SAVEFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_SECINFO]		= (nfsd4_dec)nfsd4_decode_secinfo,
	[OP_SETATTR]		= (nfsd4_dec)nfsd4_decode_setattr,
	[OP_SETCLIENTID]	= (nfsd4_dec)nfsd4_decode_setclientid,
	[OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
	[OP_VERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
	[OP_WRITE]		= (nfsd4_dec)nfsd4_decode_write,
	[OP_RELEASE_LOCKOWNER]	= (nfsd4_dec)nfsd4_decode_release_lockowner,
1536 1537
};

A
Andy Adamson 已提交
1538
static nfsd4_dec nfsd41_dec_ops[] = {
R
Randy Dunlap 已提交
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575
	[OP_ACCESS]		= (nfsd4_dec)nfsd4_decode_access,
	[OP_CLOSE]		= (nfsd4_dec)nfsd4_decode_close,
	[OP_COMMIT]		= (nfsd4_dec)nfsd4_decode_commit,
	[OP_CREATE]		= (nfsd4_dec)nfsd4_decode_create,
	[OP_DELEGPURGE]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_DELEGRETURN]	= (nfsd4_dec)nfsd4_decode_delegreturn,
	[OP_GETATTR]		= (nfsd4_dec)nfsd4_decode_getattr,
	[OP_GETFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_LINK]		= (nfsd4_dec)nfsd4_decode_link,
	[OP_LOCK]		= (nfsd4_dec)nfsd4_decode_lock,
	[OP_LOCKT]		= (nfsd4_dec)nfsd4_decode_lockt,
	[OP_LOCKU]		= (nfsd4_dec)nfsd4_decode_locku,
	[OP_LOOKUP]		= (nfsd4_dec)nfsd4_decode_lookup,
	[OP_LOOKUPP]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_NVERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
	[OP_OPEN]		= (nfsd4_dec)nfsd4_decode_open,
	[OP_OPENATTR]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_OPEN_CONFIRM]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_OPEN_DOWNGRADE]	= (nfsd4_dec)nfsd4_decode_open_downgrade,
	[OP_PUTFH]		= (nfsd4_dec)nfsd4_decode_putfh,
	[OP_PUTPUBFH]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_PUTROOTFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_READ]		= (nfsd4_dec)nfsd4_decode_read,
	[OP_READDIR]		= (nfsd4_dec)nfsd4_decode_readdir,
	[OP_READLINK]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_REMOVE]		= (nfsd4_dec)nfsd4_decode_remove,
	[OP_RENAME]		= (nfsd4_dec)nfsd4_decode_rename,
	[OP_RENEW]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_RESTOREFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_SAVEFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_SECINFO]		= (nfsd4_dec)nfsd4_decode_secinfo,
	[OP_SETATTR]		= (nfsd4_dec)nfsd4_decode_setattr,
	[OP_SETCLIENTID]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_VERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
	[OP_WRITE]		= (nfsd4_dec)nfsd4_decode_write,
	[OP_RELEASE_LOCKOWNER]	= (nfsd4_dec)nfsd4_decode_notsupp,
A
Andy Adamson 已提交
1576 1577

	/* new operations for NFSv4.1 */
1578
	[OP_BACKCHANNEL_CTL]	= (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1579
	[OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
R
Randy Dunlap 已提交
1580 1581 1582
	[OP_EXCHANGE_ID]	= (nfsd4_dec)nfsd4_decode_exchange_id,
	[OP_CREATE_SESSION]	= (nfsd4_dec)nfsd4_decode_create_session,
	[OP_DESTROY_SESSION]	= (nfsd4_dec)nfsd4_decode_destroy_session,
1583
	[OP_FREE_STATEID]	= (nfsd4_dec)nfsd4_decode_free_stateid,
R
Randy Dunlap 已提交
1584 1585 1586 1587 1588 1589
	[OP_GET_DIR_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_GETDEVICEINFO]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_GETDEVICELIST]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_LAYOUTCOMMIT]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_LAYOUTGET]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_LAYOUTRETURN]	= (nfsd4_dec)nfsd4_decode_notsupp,
J
J. Bruce Fields 已提交
1590
	[OP_SECINFO_NO_NAME]	= (nfsd4_dec)nfsd4_decode_secinfo_no_name,
R
Randy Dunlap 已提交
1591 1592
	[OP_SEQUENCE]		= (nfsd4_dec)nfsd4_decode_sequence,
	[OP_SET_SSV]		= (nfsd4_dec)nfsd4_decode_notsupp,
1593
	[OP_TEST_STATEID]	= (nfsd4_dec)nfsd4_decode_test_stateid,
R
Randy Dunlap 已提交
1594
	[OP_WANT_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,
1595
	[OP_DESTROY_CLIENTID]	= (nfsd4_dec)nfsd4_decode_destroy_clientid,
1596
	[OP_RECLAIM_COMPLETE]	= (nfsd4_dec)nfsd4_decode_reclaim_complete,
A
Andy Adamson 已提交
1597 1598
};

1599 1600 1601 1602 1603 1604
struct nfsd4_minorversion_ops {
	nfsd4_dec *decoders;
	int nops;
};

static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1605
	[0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
A
Andy Adamson 已提交
1606
	[1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1607 1608
};

1609
static __be32
L
Linus Torvalds 已提交
1610 1611 1612 1613
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
	DECODE_HEAD;
	struct nfsd4_op *op;
1614
	struct nfsd4_minorversion_ops *ops;
1615
	bool cachethis = false;
L
Linus Torvalds 已提交
1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
	int i;

	READ_BUF(4);
	READ32(argp->taglen);
	READ_BUF(argp->taglen + 8);
	SAVEMEM(argp->tag, argp->taglen);
	READ32(argp->minorversion);
	READ32(argp->opcnt);

	if (argp->taglen > NFSD4_MAX_TAGLEN)
		goto xdr_error;
	if (argp->opcnt > 100)
		goto xdr_error;

1630
	if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
L
Linus Torvalds 已提交
1631 1632 1633
		argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
		if (!argp->ops) {
			argp->ops = argp->iops;
1634
			dprintk("nfsd: couldn't allocate room for COMPOUND\n");
L
Linus Torvalds 已提交
1635 1636 1637 1638
			goto xdr_error;
		}
	}

1639
	if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1640 1641
		argp->opcnt = 0;

1642
	ops = &nfsd4_minorversion[argp->minorversion];
L
Linus Torvalds 已提交
1643 1644 1645 1646
	for (i = 0; i < argp->opcnt; i++) {
		op = &argp->ops[i];
		op->replay = NULL;

J
J. Bruce Fields 已提交
1647 1648
		READ_BUF(4);
		READ32(op->opnum);
L
Linus Torvalds 已提交
1649

1650
		if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1651
			op->status = ops->decoders[op->opnum](argp, &op->u);
1652
		else {
L
Linus Torvalds 已提交
1653 1654 1655 1656 1657 1658 1659 1660
			op->opnum = OP_ILLEGAL;
			op->status = nfserr_op_illegal;
		}

		if (op->status) {
			argp->opcnt = i+1;
			break;
		}
1661 1662 1663 1664 1665
		/*
		 * We'll try to cache the result in the DRC if any one
		 * op in the compound wants to be cached:
		 */
		cachethis |= nfsd4_cache_this_op(op);
L
Linus Torvalds 已提交
1666
	}
1667 1668 1669 1670
	/* Sessions make the DRC unnecessary: */
	if (argp->minorversion)
		cachethis = false;
	argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
L
Linus Torvalds 已提交
1671 1672 1673 1674 1675 1676 1677 1678 1679

	DECODE_TAIL;
}

#define WRITE32(n)               *p++ = htonl(n)
#define WRITE64(n)               do {				\
	*p++ = htonl((u32)((n) >> 32));				\
	*p++ = htonl((u32)(n));					\
} while (0)
1680
#define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {		\
L
Linus Torvalds 已提交
1681 1682 1683
	*(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
	memcpy(p, ptr, nbytes);					\
	p += XDR_QUADLEN(nbytes);				\
1684
}} while (0)
J
J. Bruce Fields 已提交
1685 1686 1687

static void write32(__be32 **p, u32 n)
{
1688
	*(*p)++ = htonl(n);
J
J. Bruce Fields 已提交
1689 1690 1691 1692
}

static void write64(__be32 **p, u64 n)
{
1693
	write32(p, (n >> 32));
J
J. Bruce Fields 已提交
1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
	write32(p, (u32)n);
}

static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
{
	if (IS_I_VERSION(inode)) {
		write64(p, inode->i_version);
	} else {
		write32(p, stat->ctime.tv_sec);
		write32(p, stat->ctime.tv_nsec);
	}
}

static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
{
	write32(p, c->atomic);
	if (c->change_supported) {
		write64(p, c->before_change);
		write64(p, c->after_change);
	} else {
		write32(p, c->before_ctime_sec);
		write32(p, c->before_ctime_nsec);
		write32(p, c->after_ctime_sec);
		write32(p, c->after_ctime_nsec);
	}
}
L
Linus Torvalds 已提交
1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730

#define RESERVE_SPACE(nbytes)	do {				\
	p = resp->p;						\
	BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);		\
} while (0)
#define ADJUST_ARGS()		resp->p = p

/*
 * Header routine to setup seqid operation replay cache
 */
#define ENCODE_SEQID_OP_HEAD					\
A
Al Viro 已提交
1731
	__be32 *save;						\
L
Linus Torvalds 已提交
1732 1733 1734 1735
								\
	save = resp->p;

/*
N
NeilBrown 已提交
1736 1737 1738 1739
 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
 * is where sequence id's are incremented, and the replay cache is filled.
 * Note that we increment sequence id's here, at the last moment, so we're sure
 * we know whether the error to be returned is a sequence id mutating error.
L
Linus Torvalds 已提交
1740 1741
 */

1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752
static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
{
	struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;

	if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
		stateowner->so_seqid++;
		stateowner->so_replay.rp_status = nfserr;
		stateowner->so_replay.rp_buflen =
			  (char *)resp->p - (char *)save;
		memcpy(stateowner->so_replay.rp_buf, save,
			stateowner->so_replay.rp_buflen);
1753
		nfsd4_purge_closed_stateid(stateowner);
1754 1755
	}
}
L
Linus Torvalds 已提交
1756

1757
/* Encode as an array of strings the string given with components
1758
 * separated @sep, escaped with esc_enter and esc_exit.
1759
 */
1760 1761 1762
static __be32 nfsd4_encode_components_esc(char sep, char *components,
				   __be32 **pp, int *buflen,
				   char esc_enter, char esc_exit)
1763
{
A
Al Viro 已提交
1764 1765
	__be32 *p = *pp;
	__be32 *countp = p;
1766
	int strlen, count=0;
1767
	char *str, *end, *next;
1768 1769 1770 1771 1772 1773 1774

	dprintk("nfsd4_encode_components(%s)\n", components);
	if ((*buflen -= 4) < 0)
		return nfserr_resource;
	WRITE32(0); /* We will fill this in with @count later */
	end = str = components;
	while (*end) {
1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791
		bool found_esc = false;

		/* try to parse as esc_start, ..., esc_end, sep */
		if (*str == esc_enter) {
			for (; *end && (*end != esc_exit); end++)
				/* find esc_exit or end of string */;
			next = end + 1;
			if (*end && (!*next || *next == sep)) {
				str++;
				found_esc = true;
			}
		}

		if (!found_esc)
			for (; *end && (*end != sep); end++)
				/* find sep or end of string */;

1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
		strlen = end - str;
		if (strlen) {
			if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
				return nfserr_resource;
			WRITE32(strlen);
			WRITEMEM(str, strlen);
			count++;
		}
		else
			end++;
		str = end;
	}
	*pp = p;
	p = countp;
	WRITE32(count);
	return 0;
}

1810 1811 1812 1813 1814 1815 1816 1817 1818
/* Encode as an array of strings the string given with components
 * separated @sep.
 */
static __be32 nfsd4_encode_components(char sep, char *components,
				   __be32 **pp, int *buflen)
{
	return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
}

1819 1820 1821
/*
 * encode a location element of a fs_locations structure
 */
1822
static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
A
Al Viro 已提交
1823
				    __be32 **pp, int *buflen)
1824
{
1825
	__be32 status;
A
Al Viro 已提交
1826
	__be32 *p = *pp;
1827

1828 1829
	status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
						'[', ']');
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839
	if (status)
		return status;
	status = nfsd4_encode_components('/', location->path, &p, buflen);
	if (status)
		return status;
	*pp = p;
	return 0;
}

/*
T
Trond Myklebust 已提交
1840
 * Encode a path in RFC3530 'pathname4' format
1841
 */
T
Trond Myklebust 已提交
1842 1843
static __be32 nfsd4_encode_path(const struct path *root,
		const struct path *path, __be32 **pp, int *buflen)
1844
{
T
Trond Myklebust 已提交
1845 1846 1847 1848 1849 1850 1851 1852
	struct path cur = {
		.mnt = path->mnt,
		.dentry = path->dentry,
	};
	__be32 *p = *pp;
	struct dentry **components = NULL;
	unsigned int ncomponents = 0;
	__be32 err = nfserr_jukebox;
1853

T
Trond Myklebust 已提交
1854
	dprintk("nfsd4_encode_components(");
1855

T
Trond Myklebust 已提交
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
	path_get(&cur);
	/* First walk the path up to the nfsd root, and store the
	 * dentries/path components in an array.
	 */
	for (;;) {
		if (cur.dentry == root->dentry && cur.mnt == root->mnt)
			break;
		if (cur.dentry == cur.mnt->mnt_root) {
			if (follow_up(&cur))
				continue;
			goto out_free;
		}
		if ((ncomponents & 15) == 0) {
			struct dentry **new;
			new = krealloc(components,
					sizeof(*new) * (ncomponents + 16),
					GFP_KERNEL);
			if (!new)
				goto out_free;
			components = new;
		}
		components[ncomponents++] = cur.dentry;
		cur.dentry = dget_parent(cur.dentry);
	}
1880

T
Trond Myklebust 已提交
1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897
	*buflen -= 4;
	if (*buflen < 0)
		goto out_free;
	WRITE32(ncomponents);

	while (ncomponents) {
		struct dentry *dentry = components[ncomponents - 1];
		unsigned int len = dentry->d_name.len;

		*buflen -= 4 + (XDR_QUADLEN(len) << 2);
		if (*buflen < 0)
			goto out_free;
		WRITE32(len);
		WRITEMEM(dentry->d_name.name, len);
		dprintk("/%s", dentry->d_name.name);
		dput(dentry);
		ncomponents--;
1898
	}
T
Trond Myklebust 已提交
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922

	*pp = p;
	err = 0;
out_free:
	dprintk(")\n");
	while (ncomponents)
		dput(components[--ncomponents]);
	kfree(components);
	path_put(&cur);
	return err;
}

static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
		const struct path *path, __be32 **pp, int *buflen)
{
	struct svc_export *exp_ps;
	__be32 res;

	exp_ps = rqst_find_fsidzero_export(rqstp);
	if (IS_ERR(exp_ps))
		return nfserrno(PTR_ERR(exp_ps));
	res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
	exp_put(exp_ps);
	return res;
1923 1924 1925 1926 1927
}

/*
 *  encode a fs_locations structure
 */
1928
static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1929
				     struct svc_export *exp,
A
Al Viro 已提交
1930
				     __be32 **pp, int *buflen)
1931
{
1932
	__be32 status;
1933
	int i;
A
Al Viro 已提交
1934
	__be32 *p = *pp;
1935 1936
	struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;

T
Trond Myklebust 已提交
1937
	status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
	if (status)
		return status;
	if ((*buflen -= 4) < 0)
		return nfserr_resource;
	WRITE32(fslocs->locations_count);
	for (i=0; i<fslocs->locations_count; i++) {
		status = nfsd4_encode_fs_location4(&fslocs->locations[i],
						   &p, buflen);
		if (status)
			return status;
	}
	*pp = p;
	return 0;
}
L
Linus Torvalds 已提交
1952

1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
static u32 nfs4_file_type(umode_t mode)
{
	switch (mode & S_IFMT) {
	case S_IFIFO:	return NF4FIFO;
	case S_IFCHR:	return NF4CHR;
	case S_IFDIR:	return NF4DIR;
	case S_IFBLK:	return NF4BLK;
	case S_IFLNK:	return NF4LNK;
	case S_IFREG:	return NF4REG;
	case S_IFSOCK:	return NF4SOCK;
	default:	return NF4BAD;
	};
}
L
Linus Torvalds 已提交
1966

1967
static __be32
L
Linus Torvalds 已提交
1968
nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
A
Al Viro 已提交
1969
			__be32 **p, int *buflen)
L
Linus Torvalds 已提交
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
{
	int status;

	if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
		return nfserr_resource;
	if (whotype != NFS4_ACL_WHO_NAMED)
		status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
	else if (group)
		status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
	else
		status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
	if (status < 0)
		return nfserrno(status);
	*p = xdr_encode_opaque(*p, NULL, status);
	*buflen -= (XDR_QUADLEN(status) << 2) + 4;
	BUG_ON(*buflen < 0);
	return 0;
}

1989
static inline __be32
A
Al Viro 已提交
1990
nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
L
Linus Torvalds 已提交
1991 1992 1993 1994
{
	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
}

1995
static inline __be32
A
Al Viro 已提交
1996
nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
L
Linus Torvalds 已提交
1997 1998 1999 2000
{
	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
}

2001
static inline __be32
L
Linus Torvalds 已提交
2002
nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
A
Al Viro 已提交
2003
		__be32 **p, int *buflen)
L
Linus Torvalds 已提交
2004 2005 2006 2007
{
	return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
}

2008 2009 2010 2011
#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
			      FATTR4_WORD0_RDATTR_ERROR)
#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID

2012
static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
{
	/* As per referral draft:  */
	if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
	    *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
		if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
	            *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
			*rdattr_err = NFSERR_MOVED;
		else
			return nfserr_moved;
	}
	*bmval0 &= WORD0_ABSENT_FS_ATTRS;
	*bmval1 &= WORD1_ABSENT_FS_ATTRS;
	return 0;
}
L
Linus Torvalds 已提交
2027

2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043

static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
{
	struct path path = exp->ex_path;
	int err;

	path_get(&path);
	while (follow_up(&path)) {
		if (path.dentry != path.mnt->mnt_root)
			break;
	}
	err = vfs_getattr(path.mnt, path.dentry, stat);
	path_put(&path);
	return err;
}

L
Linus Torvalds 已提交
2044 2045 2046 2047 2048 2049 2050
/*
 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
 * ourselves.
 *
 * @countp is the buffer size in _words_; upon successful return this becomes
 * replaced with the number of words written.
 */
2051
__be32
L
Linus Torvalds 已提交
2052
nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
A
Al Viro 已提交
2053
		struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2054
		struct svc_rqst *rqstp, int ignore_crossmnt)
L
Linus Torvalds 已提交
2055 2056 2057
{
	u32 bmval0 = bmval[0];
	u32 bmval1 = bmval[1];
2058
	u32 bmval2 = bmval[2];
L
Linus Torvalds 已提交
2059 2060 2061 2062
	struct kstat stat;
	struct svc_fh tempfh;
	struct kstatfs statfs;
	int buflen = *countp << 2;
A
Al Viro 已提交
2063
	__be32 *attrlenp;
L
Linus Torvalds 已提交
2064 2065
	u32 dummy;
	u64 dummy64;
2066
	u32 rdattr_err = 0;
A
Al Viro 已提交
2067
	__be32 *p = buffer;
2068
	__be32 status;
2069
	int err;
L
Linus Torvalds 已提交
2070 2071
	int aclsupport = 0;
	struct nfs4_acl *acl = NULL;
2072 2073
	struct nfsd4_compoundres *resp = rqstp->rq_resp;
	u32 minorversion = resp->cstate.minorversion;
2074 2075 2076 2077
	struct path path = {
		.mnt	= exp->ex_path.mnt,
		.dentry	= dentry,
	};
L
Linus Torvalds 已提交
2078 2079

	BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2080 2081 2082
	BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
	BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
	BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
L
Linus Torvalds 已提交
2083

2084
	if (exp->ex_fslocs.migrated) {
2085
		BUG_ON(bmval[2]);
2086 2087 2088 2089 2090
		status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
		if (status)
			goto out;
	}

2091
	err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2092
	if (err)
L
Linus Torvalds 已提交
2093
		goto out_nfserr;
2094 2095
	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
			FATTR4_WORD0_MAXNAME)) ||
L
Linus Torvalds 已提交
2096 2097
	    (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
		       FATTR4_WORD1_SPACE_TOTAL))) {
2098
		err = vfs_statfs(&path, &statfs);
2099
		if (err)
L
Linus Torvalds 已提交
2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110
			goto out_nfserr;
	}
	if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
		fh_init(&tempfh, NFS4_FHSIZE);
		status = fh_compose(&tempfh, exp, dentry, NULL);
		if (status)
			goto out;
		fhp = &tempfh;
	}
	if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
			| FATTR4_WORD0_SUPPORTED_ATTRS)) {
2111 2112
		err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
		aclsupport = (err == 0);
L
Linus Torvalds 已提交
2113
		if (bmval0 & FATTR4_WORD0_ACL) {
2114
			if (err == -EOPNOTSUPP)
L
Linus Torvalds 已提交
2115
				bmval0 &= ~FATTR4_WORD0_ACL;
2116
			else if (err == -EINVAL) {
L
Linus Torvalds 已提交
2117 2118
				status = nfserr_attrnotsupp;
				goto out;
2119
			} else if (err != 0)
L
Linus Torvalds 已提交
2120 2121 2122 2123
				goto out_nfserr;
		}
	}

2124 2125 2126
	if (bmval2) {
		if ((buflen -= 16) < 0)
			goto out_resource;
2127 2128 2129 2130
		WRITE32(3);
		WRITE32(bmval0);
		WRITE32(bmval1);
		WRITE32(bmval2);
2131 2132 2133
	} else if (bmval1) {
		if ((buflen -= 12) < 0)
			goto out_resource;
2134 2135 2136 2137
		WRITE32(2);
		WRITE32(bmval0);
		WRITE32(bmval1);
	} else {
2138 2139
		if ((buflen -= 8) < 0)
			goto out_resource;
2140 2141 2142
		WRITE32(1);
		WRITE32(bmval0);
	}
L
Linus Torvalds 已提交
2143 2144 2145
	attrlenp = p++;                /* to be backfilled later */

	if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2146 2147 2148 2149
		u32 word0 = nfsd_suppattrs0(minorversion);
		u32 word1 = nfsd_suppattrs1(minorversion);
		u32 word2 = nfsd_suppattrs2(minorversion);

2150 2151
		if (!aclsupport)
			word0 &= ~FATTR4_WORD0_ACL;
2152
		if (!word2) {
2153 2154
			if ((buflen -= 12) < 0)
				goto out_resource;
2155 2156 2157 2158
			WRITE32(2);
			WRITE32(word0);
			WRITE32(word1);
		} else {
2159 2160
			if ((buflen -= 16) < 0)
				goto out_resource;
2161 2162 2163 2164 2165
			WRITE32(3);
			WRITE32(word0);
			WRITE32(word1);
			WRITE32(word2);
		}
L
Linus Torvalds 已提交
2166 2167 2168 2169
	}
	if (bmval0 & FATTR4_WORD0_TYPE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
2170
		dummy = nfs4_file_type(stat.mode);
L
Linus Torvalds 已提交
2171 2172 2173 2174 2175 2176 2177
		if (dummy == NF4BAD)
			goto out_serverfault;
		WRITE32(dummy);
	}
	if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
N
NeilBrown 已提交
2178
		if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
N
NeilBrown 已提交
2179
			WRITE32(NFS4_FH_PERSISTENT);
N
NeilBrown 已提交
2180
		else
N
NeilBrown 已提交
2181
			WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
L
Linus Torvalds 已提交
2182 2183 2184 2185
	}
	if (bmval0 & FATTR4_WORD0_CHANGE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
J
J. Bruce Fields 已提交
2186
		write_change(&p, &stat, dentry->d_inode);
L
Linus Torvalds 已提交
2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210
	}
	if (bmval0 & FATTR4_WORD0_SIZE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64(stat.size);
	}
	if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_FSID) {
		if ((buflen -= 16) < 0)
			goto out_resource;
2211 2212 2213
		if (exp->ex_fslocs.migrated) {
			WRITE64(NFS4_REFERRAL_FSID_MAJOR);
			WRITE64(NFS4_REFERRAL_FSID_MINOR);
2214 2215
		} else switch(fsid_source(fhp)) {
		case FSIDSOURCE_FSID:
L
Linus Torvalds 已提交
2216 2217
			WRITE64((u64)exp->ex_fsid);
			WRITE64((u64)0);
2218 2219
			break;
		case FSIDSOURCE_DEV:
L
Linus Torvalds 已提交
2220 2221 2222 2223
			WRITE32(0);
			WRITE32(MAJOR(stat.dev));
			WRITE32(0);
			WRITE32(MINOR(stat.dev));
2224 2225 2226 2227
			break;
		case FSIDSOURCE_UUID:
			WRITEMEM(exp->ex_uuid, 16);
			break;
L
Linus Torvalds 已提交
2228 2229 2230 2231 2232 2233 2234 2235 2236 2237
		}
	}
	if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
		if ((buflen -= 4) < 0)
			goto out_resource;
2238
		WRITE32(nfsd4_lease);
L
Linus Torvalds 已提交
2239 2240 2241 2242
	}
	if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
		if ((buflen -= 4) < 0)
			goto out_resource;
2243
		WRITE32(rdattr_err);
L
Linus Torvalds 已提交
2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258
	}
	if (bmval0 & FATTR4_WORD0_ACL) {
		struct nfs4_ace *ace;

		if (acl == NULL) {
			if ((buflen -= 4) < 0)
				goto out_resource;

			WRITE32(0);
			goto out_acl;
		}
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(acl->naces);

2259
		for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
L
Linus Torvalds 已提交
2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288
			if ((buflen -= 4*3) < 0)
				goto out_resource;
			WRITE32(ace->type);
			WRITE32(ace->flag);
			WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
			status = nfsd4_encode_aclname(rqstp, ace->whotype,
				ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
				&p, &buflen);
			if (status == nfserr_resource)
				goto out_resource;
			if (status)
				goto out;
		}
	}
out_acl:
	if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(aclsupport ?
			ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
	}
	if (bmval0 & FATTR4_WORD0_CANSETTIME) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
2289
		WRITE32(0);
L
Linus Torvalds 已提交
2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310
	}
	if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
		buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
		if (buflen < 0)
			goto out_resource;
		WRITE32(fhp->fh_handle.fh_size);
		WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
	}
	if (bmval0 & FATTR4_WORD0_FILEID) {
		if ((buflen -= 8) < 0)
			goto out_resource;
2311
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327
	}
	if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_FREE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64((u64) statfs.f_files);
	}
2328 2329 2330 2331 2332 2333 2334
	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
		status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
		if (status == nfserr_resource)
			goto out_resource;
		if (status)
			goto out;
	}
L
Linus Torvalds 已提交
2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352
	if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64(~(u64)0);
	}
	if (bmval0 & FATTR4_WORD0_MAXLINK) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(255);
	}
	if (bmval0 & FATTR4_WORD0_MAXNAME) {
		if ((buflen -= 4) < 0)
			goto out_resource;
2353
		WRITE32(statfs.f_namelen);
L
Linus Torvalds 已提交
2354 2355 2356 2357
	}
	if (bmval0 & FATTR4_WORD0_MAXREAD) {
		if ((buflen -= 8) < 0)
			goto out_resource;
2358
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
2359 2360 2361 2362
	}
	if (bmval0 & FATTR4_WORD0_MAXWRITE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
2363
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454
	}
	if (bmval1 & FATTR4_WORD1_MODE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(stat.mode & S_IALLUGO);
	}
	if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval1 & FATTR4_WORD1_NUMLINKS) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(stat.nlink);
	}
	if (bmval1 & FATTR4_WORD1_OWNER) {
		status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
		if (status == nfserr_resource)
			goto out_resource;
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
		status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
		if (status == nfserr_resource)
			goto out_resource;
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_RAWDEV) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE32((u32) MAJOR(stat.rdev));
		WRITE32((u32) MINOR(stat.rdev));
	}
	if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_USED) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)stat.blocks << 9;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(stat.atime.tv_sec);
		WRITE32(stat.atime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(1);
		WRITE32(0);
	}
	if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(stat.ctime.tv_sec);
		WRITE32(stat.ctime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(stat.mtime.tv_sec);
		WRITE32(stat.mtime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
		if ((buflen -= 8) < 0)
                	goto out_resource;
2455 2456 2457 2458 2459
		/*
		 * Get parent's attributes if not ignoring crossmount
		 * and this is the root of a cross-mounted filesystem.
		 */
		if (ignore_crossmnt == 0 &&
2460 2461
		    dentry == exp->ex_path.mnt->mnt_root)
			get_parent_attributes(exp, &stat);
2462
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
2463
	}
2464 2465 2466 2467 2468 2469
	if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
		WRITE32(3);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
	}
2470

L
Linus Torvalds 已提交
2471 2472 2473 2474 2475
	*attrlenp = htonl((char *)p - (char *)attrlenp - 4);
	*countp = p - buffer;
	status = nfs_ok;

out:
2476
	kfree(acl);
L
Linus Torvalds 已提交
2477 2478 2479 2480
	if (fhp == &tempfh)
		fh_put(&tempfh);
	return status;
out_nfserr:
2481
	status = nfserrno(err);
L
Linus Torvalds 已提交
2482 2483 2484 2485 2486 2487 2488 2489 2490 2491
	goto out;
out_resource:
	*countp = 0;
	status = nfserr_resource;
	goto out;
out_serverfault:
	status = nfserr_serverfault;
	goto out;
}

2492 2493 2494 2495 2496 2497 2498 2499 2500
static inline int attributes_need_mount(u32 *bmval)
{
	if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
		return 1;
	if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
		return 1;
	return 0;
}

2501
static __be32
L
Linus Torvalds 已提交
2502
nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
A
Al Viro 已提交
2503
		const char *name, int namlen, __be32 *p, int *buflen)
L
Linus Torvalds 已提交
2504 2505 2506
{
	struct svc_export *exp = cd->rd_fhp->fh_export;
	struct dentry *dentry;
2507
	__be32 nfserr;
2508
	int ignore_crossmnt = 0;
L
Linus Torvalds 已提交
2509 2510 2511 2512

	dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
	if (IS_ERR(dentry))
		return nfserrno(PTR_ERR(dentry));
2513 2514 2515 2516 2517 2518 2519 2520 2521
	if (!dentry->d_inode) {
		/*
		 * nfsd_buffered_readdir drops the i_mutex between
		 * readdir and calling this callback, leaving a window
		 * where this directory entry could have gone away.
		 */
		dput(dentry);
		return nfserr_noent;
	}
L
Linus Torvalds 已提交
2522 2523

	exp_get(exp);
2524 2525 2526 2527 2528 2529 2530
	/*
	 * In the case of a mountpoint, the client may be asking for
	 * attributes that are only properties of the underlying filesystem
	 * as opposed to the cross-mounted file system. In such a case,
	 * we will not follow the cross mount and will fill the attribtutes
	 * directly from the mountpoint dentry.
	 */
2531
	if (nfsd_mountpoint(dentry, exp)) {
2532 2533
		int err;

2534 2535 2536 2537 2538
		if (!(exp->ex_flags & NFSEXP_V4ROOT)
				&& !attributes_need_mount(cd->rd_bmval)) {
			ignore_crossmnt = 1;
			goto out_encode;
		}
A
Andy Adamson 已提交
2539 2540 2541 2542 2543
		/*
		 * Why the heck aren't we just using nfsd_lookup??
		 * Different "."/".." handling?  Something else?
		 * At least, add a comment here to explain....
		 */
2544 2545 2546
		err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
		if (err) {
			nfserr = nfserrno(err);
L
Linus Torvalds 已提交
2547 2548
			goto out_put;
		}
A
Andy Adamson 已提交
2549 2550 2551
		nfserr = check_nfsd_access(exp, cd->rd_rqstp);
		if (nfserr)
			goto out_put;
L
Linus Torvalds 已提交
2552 2553

	}
2554
out_encode:
L
Linus Torvalds 已提交
2555
	nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2556
					cd->rd_rqstp, ignore_crossmnt);
L
Linus Torvalds 已提交
2557 2558 2559 2560 2561 2562
out_put:
	dput(dentry);
	exp_put(exp);
	return nfserr;
}

A
Al Viro 已提交
2563
static __be32 *
2564
nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
L
Linus Torvalds 已提交
2565
{
A
Al Viro 已提交
2566
	__be32 *attrlenp;
L
Linus Torvalds 已提交
2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580

	if (buflen < 6)
		return NULL;
	*p++ = htonl(2);
	*p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
	*p++ = htonl(0);			 /* bmval1 */

	attrlenp = p++;
	*p++ = nfserr;       /* no htonl */
	*attrlenp = htonl((char *)p - (char *)attrlenp - 4);
	return p;
}

static int
2581 2582
nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
		    loff_t offset, u64 ino, unsigned int d_type)
L
Linus Torvalds 已提交
2583
{
2584
	struct readdir_cd *ccd = ccdv;
L
Linus Torvalds 已提交
2585 2586
	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
	int buflen;
A
Al Viro 已提交
2587
	__be32 *p = cd->buffer;
2588
	__be32 *cookiep;
2589
	__be32 nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604

	/* In nfsv4, "." and ".." never make it onto the wire.. */
	if (name && isdotent(name, namlen)) {
		cd->common.err = nfs_ok;
		return 0;
	}

	if (cd->offset)
		xdr_encode_hyper(cd->offset, (u64) offset);

	buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
	if (buflen < 0)
		goto fail;

	*p++ = xdr_one;                             /* mark entry present */
2605
	cookiep = p;
L
Linus Torvalds 已提交
2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616
	p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
	p = xdr_encode_array(p, name, namlen);      /* name length & name */

	nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
	switch (nfserr) {
	case nfs_ok:
		p += buflen;
		break;
	case nfserr_resource:
		nfserr = nfserr_toosmall;
		goto fail;
2617 2618
	case nfserr_noent:
		goto skip_entry;
L
Linus Torvalds 已提交
2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629
	default:
		/*
		 * If the client requested the RDATTR_ERROR attribute,
		 * we stuff the error code into this attribute
		 * and continue.  If this attribute was not requested,
		 * then in accordance with the spec, we fail the
		 * entire READDIR operation(!)
		 */
		if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
			goto fail;
		p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2630 2631
		if (p == NULL) {
			nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
2632
			goto fail;
2633
		}
L
Linus Torvalds 已提交
2634 2635 2636
	}
	cd->buflen -= (p - cd->buffer);
	cd->buffer = p;
2637 2638
	cd->offset = cookiep;
skip_entry:
L
Linus Torvalds 已提交
2639 2640 2641 2642 2643 2644 2645
	cd->common.err = nfs_ok;
	return 0;
fail:
	cd->common.err = nfserr;
	return -EINVAL;
}

2646 2647 2648
static void
nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
{
2649
	__be32 *p;
2650 2651 2652 2653 2654 2655 2656

	RESERVE_SPACE(sizeof(stateid_t));
	WRITE32(sid->si_generation);
	WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
	ADJUST_ARGS();
}

2657
static __be32
2658
nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
L
Linus Torvalds 已提交
2659
{
2660
	__be32 *p;
L
Linus Torvalds 已提交
2661 2662 2663 2664 2665 2666 2667

	if (!nfserr) {
		RESERVE_SPACE(8);
		WRITE32(access->ac_supported);
		WRITE32(access->ac_resp_access);
		ADJUST_ARGS();
	}
2668
	return nfserr;
L
Linus Torvalds 已提交
2669 2670
}

2671 2672 2673 2674 2675 2676 2677 2678
static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
{
	__be32 *p;

	if (!nfserr) {
		RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
		WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
		WRITE32(bcts->dir);
2679
		/* Sorry, we do not yet support RDMA over 4.1: */
2680 2681 2682 2683 2684 2685
		WRITE32(0);
		ADJUST_ARGS();
	}
	return nfserr;
}

2686
static __be32
2687
nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
L
Linus Torvalds 已提交
2688 2689 2690
{
	ENCODE_SEQID_OP_HEAD;

2691 2692 2693
	if (!nfserr)
		nfsd4_encode_stateid(resp, &close->cl_stateid);

2694
	encode_seqid_op_tail(resp, save, nfserr);
2695
	return nfserr;
L
Linus Torvalds 已提交
2696 2697 2698
}


2699
static __be32
2700
nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
L
Linus Torvalds 已提交
2701
{
2702
	__be32 *p;
L
Linus Torvalds 已提交
2703 2704

	if (!nfserr) {
2705 2706
		RESERVE_SPACE(NFS4_VERIFIER_SIZE);
		WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
2707 2708
		ADJUST_ARGS();
	}
2709
	return nfserr;
L
Linus Torvalds 已提交
2710 2711
}

2712
static __be32
2713
nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
L
Linus Torvalds 已提交
2714
{
2715
	__be32 *p;
L
Linus Torvalds 已提交
2716 2717 2718

	if (!nfserr) {
		RESERVE_SPACE(32);
J
J. Bruce Fields 已提交
2719
		write_cinfo(&p, &create->cr_cinfo);
L
Linus Torvalds 已提交
2720 2721 2722 2723 2724
		WRITE32(2);
		WRITE32(create->cr_bmval[0]);
		WRITE32(create->cr_bmval[1]);
		ADJUST_ARGS();
	}
2725
	return nfserr;
L
Linus Torvalds 已提交
2726 2727
}

2728 2729
static __be32
nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
L
Linus Torvalds 已提交
2730 2731 2732 2733 2734 2735 2736 2737 2738 2739
{
	struct svc_fh *fhp = getattr->ga_fhp;
	int buflen;

	if (nfserr)
		return nfserr;

	buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
	nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
				    resp->p, &buflen, getattr->ga_bmval,
2740
				    resp->rqstp, 0);
L
Linus Torvalds 已提交
2741 2742 2743 2744 2745
	if (!nfserr)
		resp->p += buflen;
	return nfserr;
}

2746 2747
static __be32
nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
L
Linus Torvalds 已提交
2748
{
2749
	struct svc_fh *fhp = *fhpp;
L
Linus Torvalds 已提交
2750
	unsigned int len;
2751
	__be32 *p;
L
Linus Torvalds 已提交
2752 2753 2754 2755 2756 2757 2758 2759

	if (!nfserr) {
		len = fhp->fh_handle.fh_size;
		RESERVE_SPACE(len + 4);
		WRITE32(len);
		WRITEMEM(&fhp->fh_handle.fh_base, len);
		ADJUST_ARGS();
	}
2760
	return nfserr;
L
Linus Torvalds 已提交
2761 2762 2763 2764 2765 2766 2767 2768 2769
}

/*
* Including all fields other than the name, a LOCK4denied structure requires
*   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
*/
static void
nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
{
2770
	struct xdr_netobj *conf = &ld->ld_owner;
2771
	__be32 *p;
L
Linus Torvalds 已提交
2772

2773
	RESERVE_SPACE(32 + XDR_LEN(conf->len));
L
Linus Torvalds 已提交
2774 2775 2776
	WRITE64(ld->ld_start);
	WRITE64(ld->ld_length);
	WRITE32(ld->ld_type);
2777
	if (conf->len) {
L
Linus Torvalds 已提交
2778
		WRITEMEM(&ld->ld_clientid, 8);
2779 2780 2781
		WRITE32(conf->len);
		WRITEMEM(conf->data, conf->len);
		kfree(conf->data);
L
Linus Torvalds 已提交
2782 2783 2784 2785 2786 2787 2788
	}  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
		WRITE64((u64)0); /* clientid */
		WRITE32(0); /* length of owner name */
	}
	ADJUST_ARGS();
}

2789
static __be32
2790
nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
L
Linus Torvalds 已提交
2791 2792 2793
{
	ENCODE_SEQID_OP_HEAD;

2794 2795 2796
	if (!nfserr)
		nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
	else if (nfserr == nfserr_denied)
L
Linus Torvalds 已提交
2797 2798
		nfsd4_encode_lock_denied(resp, &lock->lk_denied);

2799
	encode_seqid_op_tail(resp, save, nfserr);
2800
	return nfserr;
L
Linus Torvalds 已提交
2801 2802
}

2803
static __be32
2804
nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
L
Linus Torvalds 已提交
2805 2806 2807
{
	if (nfserr == nfserr_denied)
		nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2808
	return nfserr;
L
Linus Torvalds 已提交
2809 2810
}

2811
static __be32
2812
nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
L
Linus Torvalds 已提交
2813 2814 2815
{
	ENCODE_SEQID_OP_HEAD;

2816 2817 2818
	if (!nfserr)
		nfsd4_encode_stateid(resp, &locku->lu_stateid);

2819
	encode_seqid_op_tail(resp, save, nfserr);
2820
	return nfserr;
L
Linus Torvalds 已提交
2821 2822 2823
}


2824
static __be32
2825
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
L
Linus Torvalds 已提交
2826
{
2827
	__be32 *p;
L
Linus Torvalds 已提交
2828 2829 2830

	if (!nfserr) {
		RESERVE_SPACE(20);
J
J. Bruce Fields 已提交
2831
		write_cinfo(&p, &link->li_cinfo);
L
Linus Torvalds 已提交
2832 2833
		ADJUST_ARGS();
	}
2834
	return nfserr;
L
Linus Torvalds 已提交
2835 2836 2837
}


2838
static __be32
2839
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
L
Linus Torvalds 已提交
2840
{
2841
	__be32 *p;
L
Linus Torvalds 已提交
2842 2843 2844 2845 2846
	ENCODE_SEQID_OP_HEAD;

	if (nfserr)
		goto out;

2847 2848
	nfsd4_encode_stateid(resp, &open->op_stateid);
	RESERVE_SPACE(40);
J
J. Bruce Fields 已提交
2849
	write_cinfo(&p, &open->op_cinfo);
L
Linus Torvalds 已提交
2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860
	WRITE32(open->op_rflags);
	WRITE32(2);
	WRITE32(open->op_bmval[0]);
	WRITE32(open->op_bmval[1]);
	WRITE32(open->op_delegate_type);
	ADJUST_ARGS();

	switch (open->op_delegate_type) {
	case NFS4_OPEN_DELEGATE_NONE:
		break;
	case NFS4_OPEN_DELEGATE_READ:
2861 2862
		nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
		RESERVE_SPACE(20);
2863
		WRITE32(open->op_recall);
L
Linus Torvalds 已提交
2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874

		/*
		 * TODO: ACE's in delegations
		 */
		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
		WRITE32(0);
		WRITE32(0);
		WRITE32(0);   /* XXX: is NULL principal ok? */
		ADJUST_ARGS();
		break;
	case NFS4_OPEN_DELEGATE_WRITE:
2875 2876
		nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
		RESERVE_SPACE(32);
L
Linus Torvalds 已提交
2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894
		WRITE32(0);

		/*
		 * TODO: space_limit's in delegations
		 */
		WRITE32(NFS4_LIMIT_SIZE);
		WRITE32(~(u32)0);
		WRITE32(~(u32)0);

		/*
		 * TODO: ACE's in delegations
		 */
		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
		WRITE32(0);
		WRITE32(0);
		WRITE32(0);   /* XXX: is NULL principal ok? */
		ADJUST_ARGS();
		break;
2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908
	case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
		switch (open->op_why_no_deleg) {
		case WND4_CONTENTION:
		case WND4_RESOURCE:
			RESERVE_SPACE(8);
			WRITE32(open->op_why_no_deleg);
			WRITE32(0);	/* deleg signaling not supported yet */
			break;
		default:
			RESERVE_SPACE(4);
			WRITE32(open->op_why_no_deleg);
		}
		ADJUST_ARGS();
		break;
L
Linus Torvalds 已提交
2909 2910 2911 2912 2913
	default:
		BUG();
	}
	/* XXX save filehandle here */
out:
2914
	encode_seqid_op_tail(resp, save, nfserr);
2915
	return nfserr;
L
Linus Torvalds 已提交
2916 2917
}

2918
static __be32
2919
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
L
Linus Torvalds 已提交
2920 2921
{
	ENCODE_SEQID_OP_HEAD;
2922 2923 2924

	if (!nfserr)
		nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
L
Linus Torvalds 已提交
2925

2926
	encode_seqid_op_tail(resp, save, nfserr);
2927
	return nfserr;
L
Linus Torvalds 已提交
2928 2929
}

2930
static __be32
2931
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
L
Linus Torvalds 已提交
2932 2933
{
	ENCODE_SEQID_OP_HEAD;
2934 2935 2936

	if (!nfserr)
		nfsd4_encode_stateid(resp, &od->od_stateid);
L
Linus Torvalds 已提交
2937

2938
	encode_seqid_op_tail(resp, save, nfserr);
2939
	return nfserr;
L
Linus Torvalds 已提交
2940 2941
}

2942 2943
static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2944
		  struct nfsd4_read *read)
L
Linus Torvalds 已提交
2945 2946 2947 2948 2949
{
	u32 eof;
	int v, pn;
	unsigned long maxcount; 
	long len;
2950
	__be32 *p;
L
Linus Torvalds 已提交
2951 2952 2953 2954 2955 2956 2957 2958

	if (nfserr)
		return nfserr;
	if (resp->xbuf->page_len)
		return nfserr_resource;

	RESERVE_SPACE(8); /* eof flag and byte count */

2959
	maxcount = svc_max_payload(resp->rqstp);
L
Linus Torvalds 已提交
2960 2961 2962 2963 2964 2965
	if (maxcount > read->rd_length)
		maxcount = read->rd_length;

	len = maxcount;
	v = 0;
	while (len > 0) {
2966
		pn = resp->rqstp->rq_resused++;
2967
		resp->rqstp->rq_vec[v].iov_base =
2968
			page_address(resp->rqstp->rq_respages[pn]);
2969
		resp->rqstp->rq_vec[v].iov_len =
2970
			len < PAGE_SIZE ? len : PAGE_SIZE;
L
Linus Torvalds 已提交
2971 2972 2973 2974 2975
		v++;
		len -= PAGE_SIZE;
	}
	read->rd_vlen = v;

2976
	nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2977
			read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
L
Linus Torvalds 已提交
2978 2979 2980 2981
			&maxcount);

	if (nfserr)
		return nfserr;
2982 2983
	eof = (read->rd_offset + maxcount >=
	       read->rd_fhp->fh_dentry->d_inode->i_size);
L
Linus Torvalds 已提交
2984 2985 2986 2987

	WRITE32(eof);
	WRITE32(maxcount);
	ADJUST_ARGS();
2988 2989
	resp->xbuf->head[0].iov_len = (char*)p
					- (char*)resp->xbuf->head[0].iov_base;
L
Linus Torvalds 已提交
2990 2991
	resp->xbuf->page_len = maxcount;

2992 2993
	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = p;
L
Linus Torvalds 已提交
2994 2995
	resp->xbuf->tail[0].iov_len = 0;
	if (maxcount&3) {
2996 2997
		RESERVE_SPACE(4);
		WRITE32(0);
L
Linus Torvalds 已提交
2998 2999
		resp->xbuf->tail[0].iov_base += maxcount&3;
		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3000
		ADJUST_ARGS();
L
Linus Torvalds 已提交
3001 3002 3003 3004
	}
	return 0;
}

3005 3006
static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
L
Linus Torvalds 已提交
3007 3008 3009
{
	int maxcount;
	char *page;
3010
	__be32 *p;
L
Linus Torvalds 已提交
3011 3012 3013 3014 3015 3016

	if (nfserr)
		return nfserr;
	if (resp->xbuf->page_len)
		return nfserr_resource;

3017
	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
L
Linus Torvalds 已提交
3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035

	maxcount = PAGE_SIZE;
	RESERVE_SPACE(4);

	/*
	 * XXX: By default, the ->readlink() VFS op will truncate symlinks
	 * if they would overflow the buffer.  Is this kosher in NFSv4?  If
	 * not, one easy fix is: if ->readlink() precisely fills the buffer,
	 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
	 */
	nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
	if (nfserr == nfserr_isdir)
		return nfserr_inval;
	if (nfserr)
		return nfserr;

	WRITE32(maxcount);
	ADJUST_ARGS();
3036 3037 3038
	resp->xbuf->head[0].iov_len = (char*)p
				- (char*)resp->xbuf->head[0].iov_base;
	resp->xbuf->page_len = maxcount;
L
Linus Torvalds 已提交
3039

3040 3041
	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = p;
L
Linus Torvalds 已提交
3042 3043
	resp->xbuf->tail[0].iov_len = 0;
	if (maxcount&3) {
3044 3045
		RESERVE_SPACE(4);
		WRITE32(0);
L
Linus Torvalds 已提交
3046 3047
		resp->xbuf->tail[0].iov_base += maxcount&3;
		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3048
		ADJUST_ARGS();
L
Linus Torvalds 已提交
3049 3050 3051 3052
	}
	return 0;
}

3053 3054
static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
L
Linus Torvalds 已提交
3055 3056 3057
{
	int maxcount;
	loff_t offset;
A
Al Viro 已提交
3058
	__be32 *page, *savep, *tailbase;
3059
	__be32 *p;
L
Linus Torvalds 已提交
3060 3061 3062 3063 3064 3065

	if (nfserr)
		return nfserr;
	if (resp->xbuf->page_len)
		return nfserr_resource;

3066
	RESERVE_SPACE(NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3067 3068 3069 3070 3071 3072 3073
	savep = p;

	/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
	WRITE32(0);
	WRITE32(0);
	ADJUST_ARGS();
	resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3074
	tailbase = p;
L
Linus Torvalds 已提交
3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090

	maxcount = PAGE_SIZE;
	if (maxcount > readdir->rd_maxcount)
		maxcount = readdir->rd_maxcount;

	/*
	 * Convert from bytes to words, account for the two words already
	 * written, make sure to leave two words at the end for the next
	 * pointer and eof field.
	 */
	maxcount = (maxcount >> 2) - 4;
	if (maxcount < 0) {
		nfserr =  nfserr_toosmall;
		goto err_no_verf;
	}

3091
	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
L
Linus Torvalds 已提交
3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113
	readdir->common.err = 0;
	readdir->buflen = maxcount;
	readdir->buffer = page;
	readdir->offset = NULL;

	offset = readdir->rd_cookie;
	nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
			      &offset,
			      &readdir->common, nfsd4_encode_dirent);
	if (nfserr == nfs_ok &&
	    readdir->common.err == nfserr_toosmall &&
	    readdir->buffer == page) 
		nfserr = nfserr_toosmall;
	if (nfserr)
		goto err_no_verf;

	if (readdir->offset)
		xdr_encode_hyper(readdir->offset, offset);

	p = readdir->buffer;
	*p++ = 0;	/* no more entries */
	*p++ = htonl(readdir->common.err == nfserr_eof);
3114 3115
	resp->xbuf->page_len = ((char*)p) - (char*)page_address(
		resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
L
Linus Torvalds 已提交
3116

3117 3118
	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = tailbase;
L
Linus Torvalds 已提交
3119 3120
	resp->xbuf->tail[0].iov_len = 0;
	resp->p = resp->xbuf->tail[0].iov_base;
3121
	resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
L
Linus Torvalds 已提交
3122 3123 3124 3125 3126 3127 3128 3129

	return 0;
err_no_verf:
	p = savep;
	ADJUST_ARGS();
	return nfserr;
}

3130
static __be32
3131
nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
L
Linus Torvalds 已提交
3132
{
3133
	__be32 *p;
L
Linus Torvalds 已提交
3134 3135 3136

	if (!nfserr) {
		RESERVE_SPACE(20);
J
J. Bruce Fields 已提交
3137
		write_cinfo(&p, &remove->rm_cinfo);
L
Linus Torvalds 已提交
3138 3139
		ADJUST_ARGS();
	}
3140
	return nfserr;
L
Linus Torvalds 已提交
3141 3142
}

3143
static __be32
3144
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
L
Linus Torvalds 已提交
3145
{
3146
	__be32 *p;
L
Linus Torvalds 已提交
3147 3148 3149

	if (!nfserr) {
		RESERVE_SPACE(40);
J
J. Bruce Fields 已提交
3150 3151
		write_cinfo(&p, &rename->rn_sinfo);
		write_cinfo(&p, &rename->rn_tinfo);
L
Linus Torvalds 已提交
3152 3153
		ADJUST_ARGS();
	}
3154
	return nfserr;
L
Linus Torvalds 已提交
3155 3156
}

3157
static __be32
3158 3159
nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
			 __be32 nfserr,struct svc_export *exp)
A
Andy Adamson 已提交
3160 3161
{
	int i = 0;
3162 3163 3164
	u32 nflavs;
	struct exp_flavor_info *flavs;
	struct exp_flavor_info def_flavs[2];
3165
	__be32 *p;
A
Andy Adamson 已提交
3166 3167 3168

	if (nfserr)
		goto out;
3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188
	if (exp->ex_nflavors) {
		flavs = exp->ex_flavors;
		nflavs = exp->ex_nflavors;
	} else { /* Handling of some defaults in absence of real secinfo: */
		flavs = def_flavs;
		if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
			nflavs = 2;
			flavs[0].pseudoflavor = RPC_AUTH_UNIX;
			flavs[1].pseudoflavor = RPC_AUTH_NULL;
		} else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
			nflavs = 1;
			flavs[0].pseudoflavor
					= svcauth_gss_flavor(exp->ex_client);
		} else {
			nflavs = 1;
			flavs[0].pseudoflavor
					= exp->ex_client->flavour->flavour;
		}
	}

A
Andy Adamson 已提交
3189
	RESERVE_SPACE(4);
3190
	WRITE32(nflavs);
A
Andy Adamson 已提交
3191
	ADJUST_ARGS();
3192 3193
	for (i = 0; i < nflavs; i++) {
		u32 flav = flavs[i].pseudoflavor;
A
Andy Adamson 已提交
3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219
		struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);

		if (gm) {
			RESERVE_SPACE(4);
			WRITE32(RPC_AUTH_GSS);
			ADJUST_ARGS();
			RESERVE_SPACE(4 + gm->gm_oid.len);
			WRITE32(gm->gm_oid.len);
			WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
			ADJUST_ARGS();
			RESERVE_SPACE(4);
			WRITE32(0); /* qop */
			ADJUST_ARGS();
			RESERVE_SPACE(4);
			WRITE32(gss_pseudoflavor_to_service(gm, flav));
			ADJUST_ARGS();
			gss_mech_put(gm);
		} else {
			RESERVE_SPACE(4);
			WRITE32(flav);
			ADJUST_ARGS();
		}
	}
out:
	if (exp)
		exp_put(exp);
3220
	return nfserr;
A
Andy Adamson 已提交
3221 3222
}

3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236
static __be32
nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
		     struct nfsd4_secinfo *secinfo)
{
	return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
}

static __be32
nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
		     struct nfsd4_secinfo_no_name *secinfo)
{
	return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
}

L
Linus Torvalds 已提交
3237 3238 3239 3240
/*
 * The SETATTR encode routine is special -- it always encodes a bitmap,
 * regardless of the error status.
 */
3241
static __be32
3242
nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
L
Linus Torvalds 已提交
3243
{
3244
	__be32 *p;
L
Linus Torvalds 已提交
3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257

	RESERVE_SPACE(12);
	if (nfserr) {
		WRITE32(2);
		WRITE32(0);
		WRITE32(0);
	}
	else {
		WRITE32(2);
		WRITE32(setattr->sa_bmval[0]);
		WRITE32(setattr->sa_bmval[1]);
	}
	ADJUST_ARGS();
3258
	return nfserr;
L
Linus Torvalds 已提交
3259 3260
}

3261
static __be32
3262
nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
L
Linus Torvalds 已提交
3263
{
3264
	__be32 *p;
L
Linus Torvalds 已提交
3265 3266

	if (!nfserr) {
3267
		RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3268
		WRITEMEM(&scd->se_clientid, 8);
3269
		WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3270 3271 3272 3273 3274 3275 3276 3277
		ADJUST_ARGS();
	}
	else if (nfserr == nfserr_clid_inuse) {
		RESERVE_SPACE(8);
		WRITE32(0);
		WRITE32(0);
		ADJUST_ARGS();
	}
3278
	return nfserr;
L
Linus Torvalds 已提交
3279 3280
}

3281
static __be32
3282
nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
L
Linus Torvalds 已提交
3283
{
3284
	__be32 *p;
L
Linus Torvalds 已提交
3285 3286 3287 3288 3289

	if (!nfserr) {
		RESERVE_SPACE(16);
		WRITE32(write->wr_bytes_written);
		WRITE32(write->wr_how_written);
3290
		WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3291 3292
		ADJUST_ARGS();
	}
3293
	return nfserr;
L
Linus Torvalds 已提交
3294 3295
}

A
Andy Adamson 已提交
3296
static __be32
J
J. Bruce Fields 已提交
3297
nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3298 3299
			 struct nfsd4_exchange_id *exid)
{
3300
	__be32 *p;
A
Andy Adamson 已提交
3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348
	char *major_id;
	char *server_scope;
	int major_id_sz;
	int server_scope_sz;
	uint64_t minor_id = 0;

	if (nfserr)
		return nfserr;

	major_id = utsname()->nodename;
	major_id_sz = strlen(major_id);
	server_scope = utsname()->nodename;
	server_scope_sz = strlen(server_scope);

	RESERVE_SPACE(
		8 /* eir_clientid */ +
		4 /* eir_sequenceid */ +
		4 /* eir_flags */ +
		4 /* spr_how (SP4_NONE) */ +
		8 /* so_minor_id */ +
		4 /* so_major_id.len */ +
		(XDR_QUADLEN(major_id_sz) * 4) +
		4 /* eir_server_scope.len */ +
		(XDR_QUADLEN(server_scope_sz) * 4) +
		4 /* eir_server_impl_id.count (0) */);

	WRITEMEM(&exid->clientid, 8);
	WRITE32(exid->seqid);
	WRITE32(exid->flags);

	/* state_protect4_r. Currently only support SP4_NONE */
	BUG_ON(exid->spa_how != SP4_NONE);
	WRITE32(exid->spa_how);

	/* The server_owner struct */
	WRITE64(minor_id);      /* Minor id */
	/* major id */
	WRITE32(major_id_sz);
	WRITEMEM(major_id, major_id_sz);

	/* Server scope */
	WRITE32(server_scope_sz);
	WRITEMEM(server_scope, server_scope_sz);

	/* Implementation id */
	WRITE32(0);	/* zero length nfs_impl_id4 array */
	ADJUST_ARGS();
	return 0;
A
Andy Adamson 已提交
3349 3350 3351
}

static __be32
J
J. Bruce Fields 已提交
3352
nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3353 3354
			    struct nfsd4_create_session *sess)
{
3355
	__be32 *p;
A
Andy Adamson 已提交
3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397

	if (nfserr)
		return nfserr;

	RESERVE_SPACE(24);
	WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
	WRITE32(sess->seqid);
	WRITE32(sess->flags);
	ADJUST_ARGS();

	RESERVE_SPACE(28);
	WRITE32(0); /* headerpadsz */
	WRITE32(sess->fore_channel.maxreq_sz);
	WRITE32(sess->fore_channel.maxresp_sz);
	WRITE32(sess->fore_channel.maxresp_cached);
	WRITE32(sess->fore_channel.maxops);
	WRITE32(sess->fore_channel.maxreqs);
	WRITE32(sess->fore_channel.nr_rdma_attrs);
	ADJUST_ARGS();

	if (sess->fore_channel.nr_rdma_attrs) {
		RESERVE_SPACE(4);
		WRITE32(sess->fore_channel.rdma_attrs);
		ADJUST_ARGS();
	}

	RESERVE_SPACE(28);
	WRITE32(0); /* headerpadsz */
	WRITE32(sess->back_channel.maxreq_sz);
	WRITE32(sess->back_channel.maxresp_sz);
	WRITE32(sess->back_channel.maxresp_cached);
	WRITE32(sess->back_channel.maxops);
	WRITE32(sess->back_channel.maxreqs);
	WRITE32(sess->back_channel.nr_rdma_attrs);
	ADJUST_ARGS();

	if (sess->back_channel.nr_rdma_attrs) {
		RESERVE_SPACE(4);
		WRITE32(sess->back_channel.rdma_attrs);
		ADJUST_ARGS();
	}
	return 0;
A
Andy Adamson 已提交
3398 3399 3400
}

static __be32
J
J. Bruce Fields 已提交
3401
nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3402 3403 3404 3405 3406
			     struct nfsd4_destroy_session *destroy_session)
{
	return nfserr;
}

3407
static __be32
3408
nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3409 3410 3411 3412 3413 3414 3415 3416
			  struct nfsd4_free_stateid *free_stateid)
{
	__be32 *p;

	if (nfserr)
		return nfserr;

	RESERVE_SPACE(4);
3417
	*p++ = nfserr;
3418 3419 3420 3421
	ADJUST_ARGS();
	return nfserr;
}

D
Daniel Mack 已提交
3422
static __be32
J
J. Bruce Fields 已提交
3423
nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3424 3425
		      struct nfsd4_sequence *seq)
{
3426
	__be32 *p;
B
Benny Halevy 已提交
3427 3428 3429 3430 3431 3432 3433 3434

	if (nfserr)
		return nfserr;

	RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
	WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
	WRITE32(seq->seqid);
	WRITE32(seq->slotid);
3435 3436 3437
	/* Note slotid's are numbered from zero: */
	WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
	WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3438
	WRITE32(seq->status_flags);
B
Benny Halevy 已提交
3439 3440

	ADJUST_ARGS();
3441
	resp->cstate.datap = p; /* DRC cache data pointer */
B
Benny Halevy 已提交
3442
	return 0;
A
Andy Adamson 已提交
3443 3444
}

J
J. Bruce Fields 已提交
3445
static __be32
J
J. Bruce Fields 已提交
3446
nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3447 3448
			  struct nfsd4_test_stateid *test_stateid)
{
3449
	struct nfsd4_test_stateid_id *stateid, *next;
3450 3451
	__be32 *p;

3452
	RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3453 3454
	*p++ = htonl(test_stateid->ts_num_ids);

3455
	list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3456
		*p++ = stateid->ts_id_status;
3457 3458
	}

3459
	ADJUST_ARGS();
3460 3461 3462
	return nfserr;
}

3463 3464 3465 3466 3467 3468 3469 3470
static __be32
nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
{
	return nfserr;
}

typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);

A
Andy Adamson 已提交
3471 3472 3473 3474 3475
/*
 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
 * since we don't need to filter out obsolete ops as this is
 * done in the decoding phase.
 */
3476
static nfsd4_enc nfsd4_enc_ops[] = {
3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492
	[OP_ACCESS]		= (nfsd4_enc)nfsd4_encode_access,
	[OP_CLOSE]		= (nfsd4_enc)nfsd4_encode_close,
	[OP_COMMIT]		= (nfsd4_enc)nfsd4_encode_commit,
	[OP_CREATE]		= (nfsd4_enc)nfsd4_encode_create,
	[OP_DELEGPURGE]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_DELEGRETURN]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_GETATTR]		= (nfsd4_enc)nfsd4_encode_getattr,
	[OP_GETFH]		= (nfsd4_enc)nfsd4_encode_getfh,
	[OP_LINK]		= (nfsd4_enc)nfsd4_encode_link,
	[OP_LOCK]		= (nfsd4_enc)nfsd4_encode_lock,
	[OP_LOCKT]		= (nfsd4_enc)nfsd4_encode_lockt,
	[OP_LOCKU]		= (nfsd4_enc)nfsd4_encode_locku,
	[OP_LOOKUP]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_LOOKUPP]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_NVERIFY]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_OPEN]		= (nfsd4_enc)nfsd4_encode_open,
3493
	[OP_OPENATTR]		= (nfsd4_enc)nfsd4_encode_noop,
3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513
	[OP_OPEN_CONFIRM]	= (nfsd4_enc)nfsd4_encode_open_confirm,
	[OP_OPEN_DOWNGRADE]	= (nfsd4_enc)nfsd4_encode_open_downgrade,
	[OP_PUTFH]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_PUTPUBFH]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_PUTROOTFH]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_READ]		= (nfsd4_enc)nfsd4_encode_read,
	[OP_READDIR]		= (nfsd4_enc)nfsd4_encode_readdir,
	[OP_READLINK]		= (nfsd4_enc)nfsd4_encode_readlink,
	[OP_REMOVE]		= (nfsd4_enc)nfsd4_encode_remove,
	[OP_RENAME]		= (nfsd4_enc)nfsd4_encode_rename,
	[OP_RENEW]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_RESTOREFH]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_SAVEFH]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_SECINFO]		= (nfsd4_enc)nfsd4_encode_secinfo,
	[OP_SETATTR]		= (nfsd4_enc)nfsd4_encode_setattr,
	[OP_SETCLIENTID]	= (nfsd4_enc)nfsd4_encode_setclientid,
	[OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
	[OP_VERIFY]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_WRITE]		= (nfsd4_enc)nfsd4_encode_write,
	[OP_RELEASE_LOCKOWNER]	= (nfsd4_enc)nfsd4_encode_noop,
A
Andy Adamson 已提交
3514 3515 3516

	/* NFSv4.1 operations */
	[OP_BACKCHANNEL_CTL]	= (nfsd4_enc)nfsd4_encode_noop,
3517
	[OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
A
Andy Adamson 已提交
3518 3519 3520
	[OP_EXCHANGE_ID]	= (nfsd4_enc)nfsd4_encode_exchange_id,
	[OP_CREATE_SESSION]	= (nfsd4_enc)nfsd4_encode_create_session,
	[OP_DESTROY_SESSION]	= (nfsd4_enc)nfsd4_encode_destroy_session,
3521
	[OP_FREE_STATEID]	= (nfsd4_enc)nfsd4_encode_free_stateid,
A
Andy Adamson 已提交
3522 3523 3524 3525 3526 3527
	[OP_GET_DIR_DELEGATION]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_GETDEVICEINFO]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_GETDEVICELIST]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_LAYOUTCOMMIT]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_LAYOUTGET]		= (nfsd4_enc)nfsd4_encode_noop,
	[OP_LAYOUTRETURN]	= (nfsd4_enc)nfsd4_encode_noop,
3528
	[OP_SECINFO_NO_NAME]	= (nfsd4_enc)nfsd4_encode_secinfo_no_name,
A
Andy Adamson 已提交
3529 3530
	[OP_SEQUENCE]		= (nfsd4_enc)nfsd4_encode_sequence,
	[OP_SET_SSV]		= (nfsd4_enc)nfsd4_encode_noop,
3531
	[OP_TEST_STATEID]	= (nfsd4_enc)nfsd4_encode_test_stateid,
A
Andy Adamson 已提交
3532 3533 3534
	[OP_WANT_DELEGATION]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_DESTROY_CLIENTID]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_RECLAIM_COMPLETE]	= (nfsd4_enc)nfsd4_encode_noop,
3535 3536
};

3537 3538
/*
 * Calculate the total amount of memory that the compound response has taken
3539
 * after encoding the current operation with pad.
3540
 *
3541 3542
 * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
 *      which was specified at nfsd4_operation, else pad is zero.
3543
 *
3544
 * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3545 3546 3547 3548
 *
 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
 * will be at least a page and will therefore hold the xdr_buf head.
 */
J
J. Bruce Fields 已提交
3549
__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3550 3551 3552 3553
{
	struct xdr_buf *xb = &resp->rqstp->rq_res;
	struct nfsd4_session *session = NULL;
	struct nfsd4_slot *slot = resp->cstate.slot;
3554
	u32 length, tlen = 0;
3555 3556

	if (!nfsd4_has_session(&resp->cstate))
3557
		return 0;
3558 3559

	session = resp->cstate.session;
3560 3561
	if (session == NULL)
		return 0;
3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573

	if (xb->page_len == 0) {
		length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
	} else {
		if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
			tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;

		length = xb->head[0].iov_len + xb->page_len + tlen + pad;
	}
	dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
		length, xb->page_len, tlen, pad);

3574 3575 3576
	if (length > session->se_fchannel.maxresp_sz)
		return nfserr_rep_too_big;

3577
	if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3578
	    length > session->se_fchannel.maxresp_cached)
3579
		return nfserr_rep_too_big_to_cache;
3580 3581

	return 0;
3582 3583
}

L
Linus Torvalds 已提交
3584 3585 3586
void
nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
A
Al Viro 已提交
3587
	__be32 *statp;
3588
	__be32 *p;
L
Linus Torvalds 已提交
3589 3590 3591 3592 3593 3594

	RESERVE_SPACE(8);
	WRITE32(op->opnum);
	statp = p++;	/* to be backfilled at the end */
	ADJUST_ARGS();

3595 3596 3597 3598 3599
	if (op->opnum == OP_ILLEGAL)
		goto status;
	BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
	       !nfsd4_enc_ops[op->opnum]);
	op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3600
	/* nfsd4_check_drc_limit guarantees enough room for error status */
3601 3602
	if (!op->status)
		op->status = nfsd4_check_resp_size(resp, 0);
3603
status:
L
Linus Torvalds 已提交
3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621
	/*
	 * Note: We write the status directly, instead of using WRITE32(),
	 * since it is already in network byte order.
	 */
	*statp = op->status;
}

/* 
 * Encode the reply stored in the stateowner reply cache 
 * 
 * XDR note: do not encode rp->rp_buflen: the buffer contains the
 * previously sent already encoded operation.
 *
 * called with nfs4_lock_state() held
 */
void
nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
3622
	__be32 *p;
L
Linus Torvalds 已提交
3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637
	struct nfs4_replay *rp = op->replay;

	BUG_ON(!rp);

	RESERVE_SPACE(8);
	WRITE32(op->opnum);
	*p++ = rp->rp_status;  /* already xdr'ed */
	ADJUST_ARGS();

	RESERVE_SPACE(rp->rp_buflen);
	WRITEMEM(rp->rp_buf, rp->rp_buflen);
	ADJUST_ARGS();
}

int
A
Al Viro 已提交
3638
nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
L
Linus Torvalds 已提交
3639 3640 3641 3642
{
        return xdr_ressize_check(rqstp, p);
}

3643
int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
L
Linus Torvalds 已提交
3644
{
3645 3646 3647
	struct svc_rqst *rqstp = rq;
	struct nfsd4_compoundargs *args = rqstp->rq_argp;

L
Linus Torvalds 已提交
3648 3649 3650 3651
	if (args->ops != args->iops) {
		kfree(args->ops);
		args->ops = args->iops;
	}
J
Jesper Juhl 已提交
3652 3653
	kfree(args->tmpp);
	args->tmpp = NULL;
L
Linus Torvalds 已提交
3654 3655 3656 3657 3658 3659
	while (args->to_free) {
		struct tmpbuf *tb = args->to_free;
		args->to_free = tb->next;
		tb->release(tb->buf);
		kfree(tb);
	}
3660
	return 1;
L
Linus Torvalds 已提交
3661 3662 3663
}

int
A
Al Viro 已提交
3664
nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
L
Linus Torvalds 已提交
3665 3666 3667 3668 3669 3670 3671 3672 3673 3674
{
	args->p = p;
	args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
	args->pagelist = rqstp->rq_arg.pages;
	args->pagelen = rqstp->rq_arg.page_len;
	args->tmpp = NULL;
	args->to_free = NULL;
	args->ops = args->iops;
	args->rqstp = rqstp;

3675
	return !nfsd4_decode_compound(args);
L
Linus Torvalds 已提交
3676 3677 3678
}

int
A
Al Viro 已提交
3679
nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
L
Linus Torvalds 已提交
3680 3681 3682 3683
{
	/*
	 * All that remains is to write the tag and operation count...
	 */
3684
	struct nfsd4_compound_state *cs = &resp->cstate;
L
Linus Torvalds 已提交
3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697
	struct kvec *iov;
	p = resp->tagp;
	*p++ = htonl(resp->taglen);
	memcpy(p, resp->tag, resp->taglen);
	p += XDR_QUADLEN(resp->taglen);
	*p++ = htonl(resp->opcnt);

	if (rqstp->rq_res.page_len) 
		iov = &rqstp->rq_res.tail[0];
	else
		iov = &rqstp->rq_res.head[0];
	iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
	BUG_ON(iov->iov_len > PAGE_SIZE);
3698 3699 3700
	if (nfsd4_has_session(cs)) {
		if (cs->status != nfserr_replay_cache) {
			nfsd4_store_cache_entry(resp);
3701
			cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3702
		}
3703 3704
		/* Renew the clientid on success and on replay */
		release_session_client(cs->session);
3705
		nfsd4_put_session(cs->session);
A
Andy Adamson 已提交
3706
	}
L
Linus Torvalds 已提交
3707 3708 3709 3710 3711 3712 3713 3714
	return 1;
}

/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */