nfs4xdr.c 96.1 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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#include "netns.h"
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#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
#include <linux/security.h>
#endif


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

	if (len == 0)
		return nfserr_inval;
	if (isdotent(str, len))
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		return nfserr_badname;
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	for (i = 0; i < len; i++)
		if (str[i] == '/')
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			return nfserr_badname;
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	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 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 void next_decode_page(struct nfsd4_compoundargs *argp)
{
	argp->p = page_address(argp->pagelist[0]);
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	argp->pagelist++;
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	if (argp->pagelen < PAGE_SIZE) {
		argp->end = argp->p + (argp->pagelen>>2);
		argp->pagelen = 0;
	} else {
		argp->end = argp->p + (PAGE_SIZE>>2);
		argp->pagelen -= PAGE_SIZE;
	}
}

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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);
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	next_decode_page(argp);
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	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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/**
 * defer_free - mark an allocation as deferred freed
 * @argp: NFSv4 compound argument structure to be freed with
 * @release: release callback to free @p, typically kfree()
 * @p: pointer to be freed
 *
 * Marks @p to be freed when processing the compound operation
 * described in @argp finishes.
 */
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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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/**
 * savemem - duplicate a chunk of memory for later processing
 * @argp: NFSv4 compound argument structure to be freed with
 * @p: pointer to be duplicated
 * @nbytes: length to be duplicated
 *
 * Returns a pointer to a copy of @nbytes bytes of memory at @p
 * that are preserved until processing of the NFSv4 compound
 * operation described by @argp finishes.
 */
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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,
		   struct xdr_netobj *label)
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{
	int expected_len, len = 0;
	u32 dummy32;
	char *buf;

	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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		u32 nace;
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		struct nfs4_ace *ace;
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		READ_BUF(4); len += 4;
		READ32(nace);

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		if (nace > NFS4_ACL_MAX)
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			return nfserr_fbig;
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		*acl = nfs4_acl_new(nace);
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		if (*acl == NULL)
			return nfserr_jukebox;

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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)
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				;
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			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_gid);
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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_uid);
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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;
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			READ64(iattr->ia_atime.tv_sec);
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			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;
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			READ64(iattr->ia_mtime.tv_sec);
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			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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	label->len = 0;
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
	if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32); /* lfs: we don't use it */
		READ_BUF(4);
		len += 4;
		READ32(dummy32); /* pi: we don't use it either */
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		READ_BUF(dummy32);
		if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
			return nfserr_badlabel;
		len += (XDR_QUADLEN(dummy32) << 2);
		READMEM(buf, dummy32);
		label->data = kzalloc(dummy32 + 1, GFP_KERNEL);
		if (!label->data)
			return nfserr_jukebox;
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		label->len = dummy32;
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		defer_free(argp, kfree, label->data);
		memcpy(label->data, buf, dummy32);
	}
#endif

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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;
}

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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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	if (nr_secflavs)
		cbs->flavor = (u32)(-1);
	else
		/* Is this legal? Be generous, take it to mean AUTH_NONE: */
		cbs->flavor = 0;
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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)) {
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				kuid_t kuid = make_kuid(&init_user_ns, uid);
				kgid_t kgid = make_kgid(&init_user_ns, gid);
				if (uid_valid(kuid) && gid_valid(kgid)) {
					cbs->uid = kuid;
					cbs->gid = kgid;
					cbs->flavor = RPC_AUTH_UNIX;
				} else {
					dprintk("RPC_AUTH_UNIX with invalid"
						"uid or gid ignoring!\n");
				}
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			}
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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);
575
	return nfsd4_decode_stateid(argp, &close->cl_stateid);
L
Linus Torvalds 已提交
576 577 578 579 580

	DECODE_TAIL;
}


581
static __be32
L
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582 583 584 585 586 587 588 589 590 591 592
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;
}

593
static __be32
L
Linus Torvalds 已提交
594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623
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);
624
	if ((status = check_filename(create->cr_name, create->cr_namelen)))
L
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625 626
		return status;

627
	status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
628
				    &create->cr_acl, &create->cr_label);
629
	if (status)
L
Linus Torvalds 已提交
630 631 632 633 634
		goto out;

	DECODE_TAIL;
}

635
static inline __be32
L
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636 637
nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
{
638
	return nfsd4_decode_stateid(argp, &dr->dr_stateid);
L
Linus Torvalds 已提交
639 640
}

641
static inline __be32
L
Linus Torvalds 已提交
642 643 644 645 646
nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
{
	return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
}

647
static __be32
L
Linus Torvalds 已提交
648 649 650 651 652 653 654 655
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);
656
	if ((status = check_filename(link->li_name, link->li_namelen)))
L
Linus Torvalds 已提交
657 658 659 660 661
		return status;

	DECODE_TAIL;
}

662
static __be32
L
Linus Torvalds 已提交
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
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) {
680
		READ_BUF(4);
L
Linus Torvalds 已提交
681
		READ32(lock->lk_new_open_seqid);
682 683 684 685
		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
686 687 688 689 690 691
		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 {
692 693 694 695
		status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
		if (status)
			return status;
		READ_BUF(4);
L
Linus Torvalds 已提交
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		READ32(lock->lk_old_lock_seqid);
	}

	DECODE_TAIL;
}

702
static __be32
L
Linus Torvalds 已提交
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720
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;
}

721
static __be32
L
Linus Torvalds 已提交
722 723 724 725
nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
{
	DECODE_HEAD;

726
	READ_BUF(8);
L
Linus Torvalds 已提交
727 728 729 730
	READ32(locku->lu_type);
	if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
		goto xdr_error;
	READ32(locku->lu_seqid);
731 732 733 734
	status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
	if (status)
		return status;
	READ_BUF(16);
L
Linus Torvalds 已提交
735 736 737 738 739 740
	READ64(locku->lu_offset);
	READ64(locku->lu_length);

	DECODE_TAIL;
}

741
static __be32
L
Linus Torvalds 已提交
742 743 744 745 746 747 748 749
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);
750
	if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
L
Linus Torvalds 已提交
751 752 753 754 755
		return status;

	DECODE_TAIL;
}

756
static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
757 758 759 760 761 762
{
	__be32 *p;
	u32 w;

	READ_BUF(4);
	READ32(w);
763 764 765 766 767
	*share_access = w & NFS4_SHARE_ACCESS_MASK;
	*deleg_want = w & NFS4_SHARE_WANT_MASK;
	if (deleg_when)
		*deleg_when = w & NFS4_SHARE_WHEN_MASK;

768 769 770 771 772 773 774 775
	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;
	}
776
	w &= ~NFS4_SHARE_ACCESS_MASK;
777 778 779 780 781 782 783 784 785 786 787 788 789 790 791
	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;
	}
792
	w &= ~NFS4_SHARE_WANT_MASK;
793 794
	if (!w)
		return nfs_ok;
795 796 797

	if (!deleg_when)	/* open_downgrade */
		return nfserr_inval;
798 799 800
	switch (w) {
	case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
	case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
801 802
	case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
	      NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
803 804 805 806 807 808 809 810 811 812 813 814 815
		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. */
816
	if (*x & ~NFS4_SHARE_DENY_BOTH)
817 818 819 820 821 822
		return nfserr_bad_xdr;
	return nfs_ok;
xdr_error:
	return nfserr_bad_xdr;
}

823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
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;
}

840
static __be32
L
Linus Torvalds 已提交
841 842 843
nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
{
	DECODE_HEAD;
844
	u32 dummy;
L
Linus Torvalds 已提交
845 846 847

	memset(open->op_bmval, 0, sizeof(open->op_bmval));
	open->op_iattr.ia_valid = 0;
848
	open->op_openowner = NULL;
L
Linus Torvalds 已提交
849

850
	open->op_xdr_error = 0;
L
Linus Torvalds 已提交
851
	/* seqid, share_access, share_deny, clientid, ownerlen */
852
	READ_BUF(4);
L
Linus Torvalds 已提交
853
	READ32(open->op_seqid);
854 855 856
	/* decode, yet ignore deleg_when until supported */
	status = nfsd4_decode_share_access(argp, &open->op_share_access,
					   &open->op_deleg_want, &dummy);
857 858 859 860 861
	if (status)
		goto xdr_error;
	status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
	if (status)
		goto xdr_error;
862
	READ_BUF(sizeof(clientid_t));
L
Linus Torvalds 已提交
863
	COPYMEM(&open->op_clientid, sizeof(clientid_t));
864 865 866 867
	status = nfsd4_decode_opaque(argp, &open->op_owner);
	if (status)
		goto xdr_error;
	READ_BUF(4);
L
Linus Torvalds 已提交
868 869 870 871 872 873 874 875 876 877
	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:
878
			status = nfsd4_decode_fattr(argp, open->op_bmval,
879
				&open->op_iattr, &open->op_acl, &open->op_label);
880
			if (status)
L
Linus Torvalds 已提交
881 882 883
				goto out;
			break;
		case NFS4_CREATE_EXCLUSIVE:
884 885
			READ_BUF(NFS4_VERIFIER_SIZE);
			COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
886
			break;
B
Benny Halevy 已提交
887 888 889
		case NFS4_CREATE_EXCLUSIVE4_1:
			if (argp->minorversion < 1)
				goto xdr_error;
890 891
			READ_BUF(NFS4_VERIFIER_SIZE);
			COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
B
Benny Halevy 已提交
892
			status = nfsd4_decode_fattr(argp, open->op_bmval,
893
				&open->op_iattr, &open->op_acl, &open->op_label);
B
Benny Halevy 已提交
894 895 896
			if (status)
				goto out;
			break;
L
Linus Torvalds 已提交
897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914
		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);
915
		if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
L
Linus Torvalds 已提交
916 917 918 919 920 921 922
			return status;
		break;
	case NFS4_OPEN_CLAIM_PREVIOUS:
		READ_BUF(4);
		READ32(open->op_delegate_type);
		break;
	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
923 924 925 926
		status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
		if (status)
			return status;
		READ_BUF(4);
L
Linus Torvalds 已提交
927 928 929
		READ32(open->op_fname.len);
		READ_BUF(open->op_fname.len);
		SAVEMEM(open->op_fname.data, open->op_fname.len);
930
		if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
L
Linus Torvalds 已提交
931 932
			return status;
		break;
933 934 935 936 937 938 939 940 941 942 943 944 945
	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
946 947 948 949 950 951 952
	default:
		goto xdr_error;
	}

	DECODE_TAIL;
}

953
static __be32
L
Linus Torvalds 已提交
954 955 956
nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
{
	DECODE_HEAD;
957 958 959 960

	if (argp->minorversion >= 1)
		return nfserr_notsupp;

961 962 963 964
	status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
	if (status)
		return status;
	READ_BUF(4);
L
Linus Torvalds 已提交
965
	READ32(open_conf->oc_seqid);
966

L
Linus Torvalds 已提交
967 968 969
	DECODE_TAIL;
}

970
static __be32
L
Linus Torvalds 已提交
971 972 973 974
nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
{
	DECODE_HEAD;
		    
975 976 977
	status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
	if (status)
		return status;
978
	READ_BUF(4);
L
Linus Torvalds 已提交
979
	READ32(open_down->od_seqid);
980 981
	status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
					   &open_down->od_deleg_want, NULL);
982 983 984 985 986
	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
987 988 989
	DECODE_TAIL;
}

990
static __be32
L
Linus Torvalds 已提交
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
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;
}

1005 1006 1007 1008 1009 1010 1011 1012
static __be32
nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
{
	if (argp->minorversion == 0)
		return nfs_ok;
	return nfserr_notsupp;
}

1013
static __be32
L
Linus Torvalds 已提交
1014 1015 1016 1017
nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
{
	DECODE_HEAD;

1018 1019 1020 1021
	status = nfsd4_decode_stateid(argp, &read->rd_stateid);
	if (status)
		return status;
	READ_BUF(12);
L
Linus Torvalds 已提交
1022 1023 1024 1025 1026 1027
	READ64(read->rd_offset);
	READ32(read->rd_length);

	DECODE_TAIL;
}

1028
static __be32
L
Linus Torvalds 已提交
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043
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;
}

1044
static __be32
L
Linus Torvalds 已提交
1045 1046 1047 1048 1049 1050 1051 1052
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);
1053
	if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
L
Linus Torvalds 已提交
1054 1055 1056 1057 1058
		return status;

	DECODE_TAIL;
}

1059
static __be32
L
Linus Torvalds 已提交
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
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);
1071
	if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
L
Linus Torvalds 已提交
1072
		return status;
1073
	if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
L
Linus Torvalds 已提交
1074 1075 1076 1077 1078
		return status;

	DECODE_TAIL;
}

1079
static __be32
L
Linus Torvalds 已提交
1080 1081 1082 1083
nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
{
	DECODE_HEAD;

1084 1085 1086
	if (argp->minorversion >= 1)
		return nfserr_notsupp;

L
Linus Torvalds 已提交
1087 1088 1089 1090 1091 1092
	READ_BUF(sizeof(clientid_t));
	COPYMEM(clientid, sizeof(clientid_t));

	DECODE_TAIL;
}

A
Andy Adamson 已提交
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102
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);
1103
	status = check_filename(secinfo->si_name, secinfo->si_namelen);
A
Andy Adamson 已提交
1104 1105 1106 1107 1108
	if (status)
		return status;
	DECODE_TAIL;
}

J
J. Bruce Fields 已提交
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
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;
}

1120
static __be32
L
Linus Torvalds 已提交
1121 1122
nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
{
1123
	__be32 status;
L
Linus Torvalds 已提交
1124

1125 1126 1127
	status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
	if (status)
		return status;
1128
	return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1129
				  &setattr->sa_acl, &setattr->sa_label);
L
Linus Torvalds 已提交
1130 1131
}

1132
static __be32
L
Linus Torvalds 已提交
1133 1134 1135 1136
nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
{
	DECODE_HEAD;

1137 1138 1139
	if (argp->minorversion >= 1)
		return nfserr_notsupp;

1140 1141
	READ_BUF(NFS4_VERIFIER_SIZE);
	COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
1142

1143 1144 1145 1146
	status = nfsd4_decode_opaque(argp, &setclientid->se_name);
	if (status)
		return nfserr_bad_xdr;
	READ_BUF(8);
L
Linus Torvalds 已提交
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160
	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;
}

1161
static __be32
L
Linus Torvalds 已提交
1162 1163 1164 1165
nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
{
	DECODE_HEAD;

1166 1167 1168
	if (argp->minorversion >= 1)
		return nfserr_notsupp;

1169
	READ_BUF(8 + NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
1170
	COPYMEM(&scd_c->sc_clientid, 8);
1171
	COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
1172 1173 1174 1175 1176

	DECODE_TAIL;
}

/* Also used for NVERIFY */
1177
static __be32
L
Linus Torvalds 已提交
1178 1179 1180 1181 1182 1183 1184 1185
nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
{
	DECODE_HEAD;

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

	/* For convenience's sake, we compare raw xdr'd attributes in
1186 1187
	 * nfsd4_proc_verify */

L
Linus Torvalds 已提交
1188 1189 1190 1191 1192 1193 1194 1195
	READ_BUF(4);
	READ32(verify->ve_attrlen);
	READ_BUF(verify->ve_attrlen);
	SAVEMEM(verify->ve_attrval, verify->ve_attrlen);

	DECODE_TAIL;
}

1196
static __be32
L
Linus Torvalds 已提交
1197 1198 1199 1200 1201 1202
nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
{
	int avail;
	int len;
	DECODE_HEAD;

1203 1204 1205 1206
	status = nfsd4_decode_stateid(argp, &write->wr_stateid);
	if (status)
		return status;
	READ_BUF(16);
L
Linus Torvalds 已提交
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
	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) {
1219 1220
		dprintk("NFSD: xdr error (%s:%d)\n",
				__FILE__, __LINE__);
L
Linus Torvalds 已提交
1221 1222
		goto xdr_error;
	}
1223 1224 1225
	write->wr_head.iov_base = p;
	write->wr_head.iov_len = avail;
	write->wr_pagelist = argp->pagelist;
J
J. Bruce Fields 已提交
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238

	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]);
1239
		argp->pagelist++;
J
J. Bruce Fields 已提交
1240
		argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
L
Linus Torvalds 已提交
1241
	}
J
J. Bruce Fields 已提交
1242
	argp->p += XDR_QUADLEN(len);
L
Linus Torvalds 已提交
1243 1244 1245 1246

	DECODE_TAIL;
}

1247
static __be32
L
Linus Torvalds 已提交
1248 1249 1250 1251
nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
{
	DECODE_HEAD;

1252 1253 1254
	if (argp->minorversion >= 1)
		return nfserr_notsupp;

L
Linus Torvalds 已提交
1255 1256 1257 1258 1259 1260
	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
1261 1262
	if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
		return nfserr_inval;
L
Linus Torvalds 已提交
1263 1264 1265
	DECODE_TAIL;
}

A
Andy Adamson 已提交
1266 1267
static __be32
nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
A
Andy Adamson 已提交
1268
			 struct nfsd4_exchange_id *exid)
A
Andy Adamson 已提交
1269
{
1270
	int dummy, tmp;
A
Andy Adamson 已提交
1271 1272 1273 1274 1275
	DECODE_HEAD;

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

1276 1277 1278
	status = nfsd4_decode_opaque(argp, &exid->clname);
	if (status)
		return nfserr_bad_xdr;
A
Andy Adamson 已提交
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315

	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);
1316 1317 1318 1319 1320 1321 1322
		READ32(tmp);
		while (tmp--) {
			READ_BUF(4);
			READ32(dummy);
			READ_BUF(dummy);
			p += XDR_QUADLEN(dummy);
		}
A
Andy Adamson 已提交
1323 1324 1325

		/* ssp_encr_algs<> */
		READ_BUF(4);
1326 1327 1328 1329 1330 1331 1332
		READ32(tmp);
		while (tmp--) {
			READ_BUF(4);
			READ32(dummy);
			READ_BUF(dummy);
			p += XDR_QUADLEN(dummy);
		}
A
Andy Adamson 已提交
1333 1334 1335 1336 1337 1338 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

		/* 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
1368 1369 1370 1371 1372 1373
}

static __be32
nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
			    struct nfsd4_create_session *sess)
{
A
Andy Adamson 已提交
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
	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;
	}

1416
	READ_BUF(4);
A
Andy Adamson 已提交
1417
	READ32(sess->callback_prog);
1418
	nfsd4_decode_cb_sec(argp, &sess->cb_sec);
A
Andy Adamson 已提交
1419
	DECODE_TAIL;
A
Andy Adamson 已提交
1420 1421 1422 1423 1424 1425
}

static __be32
nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
			     struct nfsd4_destroy_session *destroy_session)
{
B
Benny Halevy 已提交
1426 1427 1428 1429 1430
	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
1431 1432
}

1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
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
1446 1447 1448 1449
static __be32
nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
		      struct nfsd4_sequence *seq)
{
B
Benny Halevy 已提交
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
	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
1460 1461
}

1462 1463 1464 1465
static __be32
nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
{
	int i;
1466 1467
	__be32 *p, status;
	struct nfsd4_test_stateid_id *stateid;
1468 1469 1470 1471

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

1472
	INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1473 1474

	for (i = 0; i < test_stateid->ts_num_ids; i++) {
1475 1476
		stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
		if (!stateid) {
1477
			status = nfserrno(-ENOMEM);
1478 1479 1480 1481 1482 1483 1484 1485
			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);
1486
		if (status)
1487
			goto out;
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498
	}

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

1499 1500 1501 1502 1503 1504 1505 1506 1507 1508
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;
}

1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
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;
}

1519 1520 1521 1522 1523 1524
static __be32
nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
{
	return nfs_ok;
}

1525 1526 1527
static __be32
nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
{
1528
	return nfserr_notsupp;
1529 1530
}

1531 1532 1533
typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);

static nfsd4_dec nfsd4_dec_ops[] = {
1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553
	[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,
1554
	[OP_PUTPUBFH]		= (nfsd4_dec)nfsd4_decode_putpubfh,
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570
	[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,
A
Andy Adamson 已提交
1571 1572

	/* new operations for NFSv4.1 */
1573
	[OP_BACKCHANNEL_CTL]	= (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1574
	[OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
R
Randy Dunlap 已提交
1575 1576 1577
	[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,
1578
	[OP_FREE_STATEID]	= (nfsd4_dec)nfsd4_decode_free_stateid,
R
Randy Dunlap 已提交
1579 1580 1581 1582 1583 1584
	[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
1585
	[OP_SECINFO_NO_NAME]	= (nfsd4_dec)nfsd4_decode_secinfo_no_name,
R
Randy Dunlap 已提交
1586 1587
	[OP_SEQUENCE]		= (nfsd4_dec)nfsd4_decode_sequence,
	[OP_SET_SSV]		= (nfsd4_dec)nfsd4_decode_notsupp,
1588
	[OP_TEST_STATEID]	= (nfsd4_dec)nfsd4_decode_test_stateid,
R
Randy Dunlap 已提交
1589
	[OP_WANT_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,
1590
	[OP_DESTROY_CLIENTID]	= (nfsd4_dec)nfsd4_decode_destroy_clientid,
1591
	[OP_RECLAIM_COMPLETE]	= (nfsd4_dec)nfsd4_decode_reclaim_complete,
A
Andy Adamson 已提交
1592 1593
};

1594 1595 1596
static inline bool
nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
{
1597
	if (op->opnum < FIRST_NFS4_OP)
1598
		return false;
1599
	else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1600
		return false;
1601 1602 1603
	else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
		return false;
	else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1604 1605 1606
		return false;
	return true;
}
1607

1608
static __be32
L
Linus Torvalds 已提交
1609 1610 1611 1612
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
	DECODE_HEAD;
	struct nfsd4_op *op;
1613
	bool cachethis = false;
1614
	int max_reply = 2 * RPC_MAX_AUTH_SIZE + 8; /* opcnt, status */
L
Linus Torvalds 已提交
1615 1616 1617 1618 1619 1620 1621 1622
	int i;

	READ_BUF(4);
	READ32(argp->taglen);
	READ_BUF(argp->taglen + 8);
	SAVEMEM(argp->tag, argp->taglen);
	READ32(argp->minorversion);
	READ32(argp->opcnt);
1623
	max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
L
Linus Torvalds 已提交
1624 1625 1626 1627 1628 1629

	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 > NFSD_SUPPORTED_MINOR_VERSION)
1640 1641
		argp->opcnt = 0;

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

J
J. Bruce Fields 已提交
1646 1647
		READ_BUF(4);
		READ32(op->opnum);
L
Linus Torvalds 已提交
1648

1649 1650
		if (nfsd4_opnum_in_range(argp, op))
			op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1651
		else {
L
Linus Torvalds 已提交
1652 1653 1654
			op->opnum = OP_ILLEGAL;
			op->status = nfserr_op_illegal;
		}
1655 1656 1657 1658 1659
		/*
		 * 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);
1660

1661
		max_reply += nfsd4_max_reply(argp->rqstp, op);
1662 1663 1664 1665 1666

		if (op->status) {
			argp->opcnt = i+1;
			break;
		}
L
Linus Torvalds 已提交
1667
	}
1668 1669 1670
	/* Sessions make the DRC unnecessary: */
	if (argp->minorversion)
		cachethis = false;
1671
	svc_reserve(argp->rqstp, max_reply);
1672
	argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
L
Linus Torvalds 已提交
1673 1674 1675 1676 1677 1678 1679 1680 1681

	DECODE_TAIL;
}

#define WRITE32(n)               *p++ = htonl(n)
#define WRITE64(n)               do {				\
	*p++ = htonl((u32)((n) >> 32));				\
	*p++ = htonl((u32)(n));					\
} while (0)
1682
#define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {		\
L
Linus Torvalds 已提交
1683 1684 1685
	*(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
	memcpy(p, ptr, nbytes);					\
	p += XDR_QUADLEN(nbytes);				\
1686
}} while (0)
J
J. Bruce Fields 已提交
1687 1688 1689

static void write32(__be32 **p, u32 n)
{
1690
	*(*p)++ = htonl(n);
J
J. Bruce Fields 已提交
1691 1692 1693 1694
}

static void write64(__be32 **p, u64 n)
{
1695
	write32(p, (n >> 32));
J
J. Bruce Fields 已提交
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
	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
1722

1723
/* Encode as an array of strings the string given with components
1724
 * separated @sep, escaped with esc_enter and esc_exit.
1725
 */
1726 1727 1728
static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
					  char *components, char esc_enter,
					  char esc_exit)
1729
{
1730
	__be32 *p;
1731 1732
	__be32 pathlen;
	int pathlen_offset;
1733
	int strlen, count=0;
1734
	char *str, *end, *next;
1735 1736

	dprintk("nfsd4_encode_components(%s)\n", components);
1737 1738

	pathlen_offset = xdr->buf->len;
1739 1740
	p = xdr_reserve_space(xdr, 4);
	if (!p)
1741
		return nfserr_resource;
1742 1743
	p++; /* We will fill this in with @count later */

1744 1745
	end = str = components;
	while (*end) {
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762
		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 */;

1763 1764
		strlen = end - str;
		if (strlen) {
1765 1766
			p = xdr_reserve_space(xdr, strlen + 4);
			if (!p)
1767 1768 1769 1770 1771 1772 1773 1774 1775
				return nfserr_resource;
			WRITE32(strlen);
			WRITEMEM(str, strlen);
			count++;
		}
		else
			end++;
		str = end;
	}
1776 1777
	pathlen = htonl(xdr->buf->len - pathlen_offset);
	write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1778 1779 1780
	return 0;
}

1781 1782 1783
/* Encode as an array of strings the string given with components
 * separated @sep.
 */
1784 1785
static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
				      char *components)
1786
{
1787
	return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1788 1789
}

1790 1791 1792
/*
 * encode a location element of a fs_locations structure
 */
1793 1794
static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
					struct nfsd4_fs_location *location)
1795
{
1796
	__be32 status;
1797

1798
	status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1799
						'[', ']');
1800 1801
	if (status)
		return status;
1802
	status = nfsd4_encode_components(xdr, '/', location->path);
1803 1804 1805 1806 1807 1808
	if (status)
		return status;
	return 0;
}

/*
T
Trond Myklebust 已提交
1809
 * Encode a path in RFC3530 'pathname4' format
1810
 */
1811 1812 1813
static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
				const struct path *root,
				const struct path *path)
1814
{
1815
	struct path cur = *path;
1816
	__be32 *p;
T
Trond Myklebust 已提交
1817 1818 1819
	struct dentry **components = NULL;
	unsigned int ncomponents = 0;
	__be32 err = nfserr_jukebox;
1820

T
Trond Myklebust 已提交
1821
	dprintk("nfsd4_encode_components(");
1822

T
Trond Myklebust 已提交
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846
	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);
	}
1847 1848 1849
	err = nfserr_resource;
	p = xdr_reserve_space(xdr, 4);
	if (!p)
T
Trond Myklebust 已提交
1850 1851 1852 1853 1854
		goto out_free;
	WRITE32(ncomponents);

	while (ncomponents) {
		struct dentry *dentry = components[ncomponents - 1];
1855
		unsigned int len;
T
Trond Myklebust 已提交
1856

1857 1858
		spin_lock(&dentry->d_lock);
		len = dentry->d_name.len;
1859 1860
		p = xdr_reserve_space(xdr, len + 4);
		if (!p) {
1861
			spin_unlock(&dentry->d_lock);
T
Trond Myklebust 已提交
1862
			goto out_free;
1863
		}
T
Trond Myklebust 已提交
1864 1865 1866
		WRITE32(len);
		WRITEMEM(dentry->d_name.name, len);
		dprintk("/%s", dentry->d_name.name);
1867
		spin_unlock(&dentry->d_lock);
T
Trond Myklebust 已提交
1868 1869
		dput(dentry);
		ncomponents--;
1870
	}
T
Trond Myklebust 已提交
1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881

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

1882 1883
static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
			struct svc_rqst *rqstp, const struct path *path)
T
Trond Myklebust 已提交
1884 1885 1886 1887 1888 1889 1890
{
	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));
1891
	res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
T
Trond Myklebust 已提交
1892 1893
	exp_put(exp_ps);
	return res;
1894 1895 1896 1897 1898
}

/*
 *  encode a fs_locations structure
 */
1899 1900
static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
			struct svc_rqst *rqstp, struct svc_export *exp)
1901
{
1902
	__be32 status;
1903
	int i;
1904
	__be32 *p;
1905 1906
	struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;

1907
	status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1908 1909
	if (status)
		return status;
1910 1911
	p = xdr_reserve_space(xdr, 4);
	if (!p)
1912 1913 1914
		return nfserr_resource;
	WRITE32(fslocs->locations_count);
	for (i=0; i<fslocs->locations_count; i++) {
1915
		status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1916 1917 1918 1919 1920
		if (status)
			return status;
	}
	return 0;
}
L
Linus Torvalds 已提交
1921

1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934
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
1935

1936
static inline __be32
1937 1938
nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
		     struct nfs4_ace *ace)
L
Linus Torvalds 已提交
1939
{
1940
	if (ace->whotype != NFS4_ACL_WHO_NAMED)
1941
		return nfs4_acl_write_who(xdr, ace->whotype);
1942
	else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1943
		return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1944
	else
1945
		return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
L
Linus Torvalds 已提交
1946 1947
}

1948 1949 1950 1951
#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

1952 1953
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
static inline __be32
1954 1955
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
			    void *context, int len)
1956
{
1957
	__be32 *p;
1958

1959 1960
	p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
	if (!p)
1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973
		return nfserr_resource;

	/*
	 * For now we use a 0 here to indicate the null translation; in
	 * the future we may place a call to translation code here.
	 */
	WRITE32(0); /* lfs */
	WRITE32(0); /* pi */
	p = xdr_encode_opaque(p, context, len);
	return 0;
}
#else
static inline __be32
1974 1975
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
			    void *context, int len)
1976 1977 1978
{ return 0; }
#endif

1979
static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
{
	/* 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
1994

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005

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;
	}
A
Al Viro 已提交
2006
	err = vfs_getattr(&path, stat);
2007 2008 2009 2010
	path_put(&path);
	return err;
}

L
Linus Torvalds 已提交
2011 2012 2013 2014
/*
 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
 * ourselves.
 */
2015
__be32
2016 2017 2018
nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
		struct svc_export *exp,
		struct dentry *dentry, u32 *bmval,
2019
		struct svc_rqst *rqstp, int ignore_crossmnt)
L
Linus Torvalds 已提交
2020 2021 2022
{
	u32 bmval0 = bmval[0];
	u32 bmval1 = bmval[1];
2023
	u32 bmval2 = bmval[2];
L
Linus Torvalds 已提交
2024
	struct kstat stat;
2025
	struct svc_fh *tempfh = NULL;
L
Linus Torvalds 已提交
2026
	struct kstatfs statfs;
2027
	__be32 *p;
J
J. Bruce Fields 已提交
2028
	int starting_len = xdr->buf->len;
2029 2030
	int attrlen_offset;
	__be32 attrlen;
L
Linus Torvalds 已提交
2031 2032
	u32 dummy;
	u64 dummy64;
2033
	u32 rdattr_err = 0;
2034
	__be32 status;
2035
	int err;
L
Linus Torvalds 已提交
2036 2037
	int aclsupport = 0;
	struct nfs4_acl *acl = NULL;
2038 2039 2040
	void *context = NULL;
	int contextlen;
	bool contextsupport = false;
2041 2042
	struct nfsd4_compoundres *resp = rqstp->rq_resp;
	u32 minorversion = resp->cstate.minorversion;
2043 2044 2045 2046
	struct path path = {
		.mnt	= exp->ex_path.mnt,
		.dentry	= dentry,
	};
2047
	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
L
Linus Torvalds 已提交
2048 2049

	BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2050 2051 2052
	BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
	BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
	BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
L
Linus Torvalds 已提交
2053

2054
	if (exp->ex_fslocs.migrated) {
2055
		BUG_ON(bmval[2]);
2056 2057 2058 2059 2060
		status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
		if (status)
			goto out;
	}

A
Al Viro 已提交
2061
	err = vfs_getattr(&path, &stat);
2062
	if (err)
L
Linus Torvalds 已提交
2063
		goto out_nfserr;
2064 2065
	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
			FATTR4_WORD0_MAXNAME)) ||
L
Linus Torvalds 已提交
2066 2067
	    (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
		       FATTR4_WORD1_SPACE_TOTAL))) {
2068
		err = vfs_statfs(&path, &statfs);
2069
		if (err)
L
Linus Torvalds 已提交
2070 2071 2072
			goto out_nfserr;
	}
	if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2073 2074 2075 2076 2077 2078
		tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
		status = nfserr_jukebox;
		if (!tempfh)
			goto out;
		fh_init(tempfh, NFS4_FHSIZE);
		status = fh_compose(tempfh, exp, dentry, NULL);
L
Linus Torvalds 已提交
2079 2080
		if (status)
			goto out;
2081
		fhp = tempfh;
L
Linus Torvalds 已提交
2082 2083 2084
	}
	if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
			| FATTR4_WORD0_SUPPORTED_ATTRS)) {
2085 2086
		err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
		aclsupport = (err == 0);
L
Linus Torvalds 已提交
2087
		if (bmval0 & FATTR4_WORD0_ACL) {
2088
			if (err == -EOPNOTSUPP)
L
Linus Torvalds 已提交
2089
				bmval0 &= ~FATTR4_WORD0_ACL;
2090
			else if (err == -EINVAL) {
L
Linus Torvalds 已提交
2091 2092
				status = nfserr_attrnotsupp;
				goto out;
2093
			} else if (err != 0)
L
Linus Torvalds 已提交
2094 2095 2096 2097
				goto out_nfserr;
		}
	}

2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
	if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
			bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
		err = security_inode_getsecctx(dentry->d_inode,
						&context, &contextlen);
		contextsupport = (err == 0);
		if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
			if (err == -EOPNOTSUPP)
				bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
			else if (err)
				goto out_nfserr;
		}
	}
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */

2113
	if (bmval2) {
2114 2115
		p = xdr_reserve_space(xdr, 16);
		if (!p)
2116
			goto out_resource;
2117 2118 2119 2120
		WRITE32(3);
		WRITE32(bmval0);
		WRITE32(bmval1);
		WRITE32(bmval2);
2121
	} else if (bmval1) {
2122 2123
		p = xdr_reserve_space(xdr, 12);
		if (!p)
2124
			goto out_resource;
2125 2126 2127 2128
		WRITE32(2);
		WRITE32(bmval0);
		WRITE32(bmval1);
	} else {
2129 2130
		p = xdr_reserve_space(xdr, 8);
		if (!p)
2131
			goto out_resource;
2132 2133 2134
		WRITE32(1);
		WRITE32(bmval0);
	}
2135 2136

	attrlen_offset = xdr->buf->len;
2137 2138 2139
	p = xdr_reserve_space(xdr, 4);
	if (!p)
		goto out_resource;
2140
	p++;                /* to be backfilled later */
L
Linus Torvalds 已提交
2141 2142

	if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2143 2144 2145 2146
		u32 word0 = nfsd_suppattrs0(minorversion);
		u32 word1 = nfsd_suppattrs1(minorversion);
		u32 word2 = nfsd_suppattrs2(minorversion);

2147 2148
		if (!aclsupport)
			word0 &= ~FATTR4_WORD0_ACL;
2149 2150
		if (!contextsupport)
			word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2151
		if (!word2) {
2152 2153
			p = xdr_reserve_space(xdr, 12);
			if (!p)
2154
				goto out_resource;
2155 2156 2157 2158
			WRITE32(2);
			WRITE32(word0);
			WRITE32(word1);
		} else {
2159 2160
			p = xdr_reserve_space(xdr, 16);
			if (!p)
2161
				goto out_resource;
2162 2163 2164 2165 2166
			WRITE32(3);
			WRITE32(word0);
			WRITE32(word1);
			WRITE32(word2);
		}
L
Linus Torvalds 已提交
2167 2168
	}
	if (bmval0 & FATTR4_WORD0_TYPE) {
2169 2170
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2171
			goto out_resource;
2172
		dummy = nfs4_file_type(stat.mode);
2173 2174 2175 2176
		if (dummy == NF4BAD) {
			status = nfserr_serverfault;
			goto out;
		}
L
Linus Torvalds 已提交
2177 2178 2179
		WRITE32(dummy);
	}
	if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2180 2181
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2182
			goto out_resource;
N
NeilBrown 已提交
2183
		if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
N
NeilBrown 已提交
2184
			WRITE32(NFS4_FH_PERSISTENT);
N
NeilBrown 已提交
2185
		else
N
NeilBrown 已提交
2186
			WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
L
Linus Torvalds 已提交
2187 2188
	}
	if (bmval0 & FATTR4_WORD0_CHANGE) {
2189 2190
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2191
			goto out_resource;
J
J. Bruce Fields 已提交
2192
		write_change(&p, &stat, dentry->d_inode);
L
Linus Torvalds 已提交
2193 2194
	}
	if (bmval0 & FATTR4_WORD0_SIZE) {
2195 2196
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2197 2198 2199 2200
			goto out_resource;
		WRITE64(stat.size);
	}
	if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2201 2202
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2203 2204 2205 2206
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2207 2208
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2209 2210 2211 2212
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2213 2214
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2215 2216 2217 2218
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_FSID) {
2219 2220
		p = xdr_reserve_space(xdr, 16);
		if (!p)
L
Linus Torvalds 已提交
2221
			goto out_resource;
2222 2223 2224
		if (exp->ex_fslocs.migrated) {
			WRITE64(NFS4_REFERRAL_FSID_MAJOR);
			WRITE64(NFS4_REFERRAL_FSID_MINOR);
2225 2226
		} else switch(fsid_source(fhp)) {
		case FSIDSOURCE_FSID:
L
Linus Torvalds 已提交
2227 2228
			WRITE64((u64)exp->ex_fsid);
			WRITE64((u64)0);
2229 2230
			break;
		case FSIDSOURCE_DEV:
L
Linus Torvalds 已提交
2231 2232 2233 2234
			WRITE32(0);
			WRITE32(MAJOR(stat.dev));
			WRITE32(0);
			WRITE32(MINOR(stat.dev));
2235 2236 2237 2238
			break;
		case FSIDSOURCE_UUID:
			WRITEMEM(exp->ex_uuid, 16);
			break;
L
Linus Torvalds 已提交
2239 2240 2241
		}
	}
	if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2242 2243
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2244 2245 2246 2247
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2248 2249
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2250
			goto out_resource;
2251
		WRITE32(nn->nfsd4_lease);
L
Linus Torvalds 已提交
2252 2253
	}
	if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2254 2255
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2256
			goto out_resource;
2257
		WRITE32(rdattr_err);
L
Linus Torvalds 已提交
2258 2259 2260 2261 2262
	}
	if (bmval0 & FATTR4_WORD0_ACL) {
		struct nfs4_ace *ace;

		if (acl == NULL) {
2263 2264
			p = xdr_reserve_space(xdr, 4);
			if (!p)
L
Linus Torvalds 已提交
2265 2266 2267 2268 2269
				goto out_resource;

			WRITE32(0);
			goto out_acl;
		}
2270 2271
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2272 2273 2274
			goto out_resource;
		WRITE32(acl->naces);

2275
		for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2276 2277
			p = xdr_reserve_space(xdr, 4*3);
			if (!p)
L
Linus Torvalds 已提交
2278 2279 2280 2281
				goto out_resource;
			WRITE32(ace->type);
			WRITE32(ace->flag);
			WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2282
			status = nfsd4_encode_aclname(xdr, rqstp, ace);
L
Linus Torvalds 已提交
2283 2284 2285 2286 2287 2288
			if (status)
				goto out;
		}
	}
out_acl:
	if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2289 2290
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2291 2292 2293 2294 2295
			goto out_resource;
		WRITE32(aclsupport ?
			ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
	}
	if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2296 2297
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2298 2299 2300 2301
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2302 2303
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2304
			goto out_resource;
2305
		WRITE32(0);
L
Linus Torvalds 已提交
2306 2307
	}
	if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2308 2309
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2310 2311 2312 2313
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2314 2315
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2316 2317 2318 2319
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2320 2321
		p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
		if (!p)
L
Linus Torvalds 已提交
2322 2323 2324 2325 2326
			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) {
2327 2328
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2329
			goto out_resource;
2330
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
2331 2332
	}
	if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2333 2334
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2335 2336 2337 2338
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2339 2340
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2341 2342 2343 2344
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2345 2346
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2347 2348 2349
			goto out_resource;
		WRITE64((u64) statfs.f_files);
	}
2350
	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2351
		status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2352 2353 2354
		if (status)
			goto out;
	}
L
Linus Torvalds 已提交
2355
	if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2356 2357
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2358 2359 2360 2361
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2362 2363
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2364
			goto out_resource;
2365
		WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
L
Linus Torvalds 已提交
2366 2367
	}
	if (bmval0 & FATTR4_WORD0_MAXLINK) {
2368 2369
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2370 2371 2372 2373
			goto out_resource;
		WRITE32(255);
	}
	if (bmval0 & FATTR4_WORD0_MAXNAME) {
2374 2375
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2376
			goto out_resource;
2377
		WRITE32(statfs.f_namelen);
L
Linus Torvalds 已提交
2378 2379
	}
	if (bmval0 & FATTR4_WORD0_MAXREAD) {
2380 2381
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2382
			goto out_resource;
2383
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
2384 2385
	}
	if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2386 2387
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2388
			goto out_resource;
2389
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
2390 2391
	}
	if (bmval1 & FATTR4_WORD1_MODE) {
2392 2393
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2394 2395 2396 2397
			goto out_resource;
		WRITE32(stat.mode & S_IALLUGO);
	}
	if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2398 2399
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2400 2401 2402 2403
			goto out_resource;
		WRITE32(1);
	}
	if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2404 2405
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2406 2407 2408 2409
			goto out_resource;
		WRITE32(stat.nlink);
	}
	if (bmval1 & FATTR4_WORD1_OWNER) {
2410
		status = nfsd4_encode_user(xdr, rqstp, stat.uid);
L
Linus Torvalds 已提交
2411 2412 2413 2414
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2415
		status = nfsd4_encode_group(xdr, rqstp, stat.gid);
L
Linus Torvalds 已提交
2416 2417 2418 2419
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_RAWDEV) {
2420 2421
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2422 2423 2424 2425 2426
			goto out_resource;
		WRITE32((u32) MAJOR(stat.rdev));
		WRITE32((u32) MINOR(stat.rdev));
	}
	if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2427 2428
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2429 2430 2431 2432 2433
			goto out_resource;
		dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2434 2435
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2436 2437 2438 2439 2440
			goto out_resource;
		dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2441 2442
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2443 2444 2445 2446 2447
			goto out_resource;
		dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2448 2449
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2450 2451 2452 2453 2454
			goto out_resource;
		dummy64 = (u64)stat.blocks << 9;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2455 2456
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2457
			goto out_resource;
2458
		WRITE64((s64)stat.atime.tv_sec);
L
Linus Torvalds 已提交
2459 2460 2461
		WRITE32(stat.atime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2462 2463
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2464 2465 2466 2467 2468 2469
			goto out_resource;
		WRITE32(0);
		WRITE32(1);
		WRITE32(0);
	}
	if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2470 2471
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2472
			goto out_resource;
2473
		WRITE64((s64)stat.ctime.tv_sec);
L
Linus Torvalds 已提交
2474 2475 2476
		WRITE32(stat.ctime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2477 2478
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2479
			goto out_resource;
2480
		WRITE64((s64)stat.mtime.tv_sec);
L
Linus Torvalds 已提交
2481 2482 2483
		WRITE32(stat.mtime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2484 2485
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2486
                	goto out_resource;
2487 2488 2489 2490 2491
		/*
		 * Get parent's attributes if not ignoring crossmount
		 * and this is the root of a cross-mounted filesystem.
		 */
		if (ignore_crossmnt == 0 &&
2492 2493
		    dentry == exp->ex_path.mnt->mnt_root)
			get_parent_attributes(exp, &stat);
2494
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
2495
	}
2496
	if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2497 2498
		status = nfsd4_encode_security_label(xdr, rqstp, context,
								contextlen);
2499 2500 2501
		if (status)
			goto out;
	}
2502
	if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2503 2504
		p = xdr_reserve_space(xdr, 16);
		if (!p)
2505
			goto out_resource;
2506 2507 2508 2509 2510
		WRITE32(3);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
	}
2511

2512 2513
	attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
	write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
L
Linus Torvalds 已提交
2514 2515 2516
	status = nfs_ok;

out:
2517
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2518 2519
	if (context)
		security_release_secctx(context, contextlen);
2520
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2521
	kfree(acl);
2522
	if (tempfh) {
2523
		fh_put(tempfh);
2524 2525
		kfree(tempfh);
	}
J
J. Bruce Fields 已提交
2526 2527
	if (status)
		xdr_truncate_encode(xdr, starting_len);
L
Linus Torvalds 已提交
2528 2529
	return status;
out_nfserr:
2530
	status = nfserrno(err);
L
Linus Torvalds 已提交
2531 2532 2533 2534 2535 2536
	goto out;
out_resource:
	status = nfserr_resource;
	goto out;
}

2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551
static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
				struct xdr_buf *buf, __be32 *p, int bytes)
{
	xdr->scratch.iov_len = 0;
	memset(buf, 0, sizeof(struct xdr_buf));
	buf->head[0].iov_base = p;
	buf->head[0].iov_len = 0;
	buf->len = 0;
	xdr->buf = buf;
	xdr->iov = buf->head;
	xdr->p = p;
	xdr->end = (void *)p + bytes;
	buf->buflen = bytes;
}

2552 2553 2554 2555 2556
__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
			struct svc_fh *fhp, struct svc_export *exp,
			struct dentry *dentry, u32 *bmval,
			struct svc_rqst *rqstp, int ignore_crossmnt)
{
2557
	struct xdr_buf dummy;
2558 2559 2560
	struct xdr_stream xdr;
	__be32 ret;

2561
	svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2562 2563 2564 2565 2566 2567
	ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
							ignore_crossmnt);
	*p = xdr.p;
	return ret;
}

2568 2569 2570 2571 2572 2573 2574 2575 2576
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;
}

2577
static __be32
L
Linus Torvalds 已提交
2578
nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2579
		const char *name, int namlen, __be32 **p, int buflen)
L
Linus Torvalds 已提交
2580 2581 2582
{
	struct svc_export *exp = cd->rd_fhp->fh_export;
	struct dentry *dentry;
2583
	__be32 nfserr;
2584
	int ignore_crossmnt = 0;
L
Linus Torvalds 已提交
2585 2586 2587 2588

	dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
	if (IS_ERR(dentry))
		return nfserrno(PTR_ERR(dentry));
2589 2590 2591 2592 2593 2594 2595 2596 2597
	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
2598 2599

	exp_get(exp);
2600 2601 2602 2603 2604 2605 2606
	/*
	 * 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.
	 */
2607
	if (nfsd_mountpoint(dentry, exp)) {
2608 2609
		int err;

2610 2611 2612 2613 2614
		if (!(exp->ex_flags & NFSEXP_V4ROOT)
				&& !attributes_need_mount(cd->rd_bmval)) {
			ignore_crossmnt = 1;
			goto out_encode;
		}
A
Andy Adamson 已提交
2615 2616 2617 2618 2619
		/*
		 * Why the heck aren't we just using nfsd_lookup??
		 * Different "."/".." handling?  Something else?
		 * At least, add a comment here to explain....
		 */
2620 2621 2622
		err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
		if (err) {
			nfserr = nfserrno(err);
L
Linus Torvalds 已提交
2623 2624
			goto out_put;
		}
A
Andy Adamson 已提交
2625 2626 2627
		nfserr = check_nfsd_access(exp, cd->rd_rqstp);
		if (nfserr)
			goto out_put;
L
Linus Torvalds 已提交
2628 2629

	}
2630
out_encode:
2631 2632
	nfserr = nfsd4_encode_fattr_to_buf(p, buflen, NULL, exp, dentry,
					cd->rd_bmval,
2633
					cd->rd_rqstp, ignore_crossmnt);
L
Linus Torvalds 已提交
2634 2635 2636 2637 2638 2639
out_put:
	dput(dentry);
	exp_put(exp);
	return nfserr;
}

A
Al Viro 已提交
2640
static __be32 *
2641
nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
L
Linus Torvalds 已提交
2642 2643 2644 2645 2646 2647 2648
{
	if (buflen < 6)
		return NULL;
	*p++ = htonl(2);
	*p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
	*p++ = htonl(0);			 /* bmval1 */

2649
	*p++ = htonl(4);     /* attribute length */
L
Linus Torvalds 已提交
2650 2651 2652 2653 2654
	*p++ = nfserr;       /* no htonl */
	return p;
}

static int
2655 2656
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
2657
{
2658
	struct readdir_cd *ccd = ccdv;
L
Linus Torvalds 已提交
2659 2660
	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
	int buflen;
A
Al Viro 已提交
2661
	__be32 *p = cd->buffer;
2662
	__be32 *cookiep;
2663
	__be32 nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678

	/* 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 */
2679
	cookiep = p;
L
Linus Torvalds 已提交
2680 2681 2682
	p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
	p = xdr_encode_array(p, name, namlen);      /* name length & name */

2683
	nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
L
Linus Torvalds 已提交
2684 2685 2686 2687 2688 2689
	switch (nfserr) {
	case nfs_ok:
		break;
	case nfserr_resource:
		nfserr = nfserr_toosmall;
		goto fail;
2690 2691
	case nfserr_noent:
		goto skip_entry;
L
Linus Torvalds 已提交
2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702
	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);
2703 2704
		if (p == NULL) {
			nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
2705
			goto fail;
2706
		}
L
Linus Torvalds 已提交
2707 2708 2709
	}
	cd->buflen -= (p - cd->buffer);
	cd->buffer = p;
2710 2711
	cd->offset = cookiep;
skip_entry:
L
Linus Torvalds 已提交
2712 2713 2714 2715 2716 2717 2718
	cd->common.err = nfs_ok;
	return 0;
fail:
	cd->common.err = nfserr;
	return -EINVAL;
}

2719 2720
static __be32
nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2721
{
2722
	__be32 *p;
2723

2724 2725 2726
	p = xdr_reserve_space(xdr, sizeof(stateid_t));
	if (!p)
		return nfserr_resource;
2727 2728
	WRITE32(sid->si_generation);
	WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2729
	return 0;
2730 2731
}

2732
static __be32
2733
nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
L
Linus Torvalds 已提交
2734
{
2735
	struct xdr_stream *xdr = &resp->xdr;
2736
	__be32 *p;
L
Linus Torvalds 已提交
2737 2738

	if (!nfserr) {
2739 2740 2741
		p = xdr_reserve_space(xdr, 8);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
2742 2743 2744
		WRITE32(access->ac_supported);
		WRITE32(access->ac_resp_access);
	}
2745
	return nfserr;
L
Linus Torvalds 已提交
2746 2747
}

2748 2749
static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
{
2750
	struct xdr_stream *xdr = &resp->xdr;
2751 2752 2753
	__be32 *p;

	if (!nfserr) {
2754 2755 2756
		p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
		if (!p)
			return nfserr_resource;
2757 2758
		WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
		WRITE32(bcts->dir);
2759
		/* Sorry, we do not yet support RDMA over 4.1: */
2760 2761 2762 2763 2764
		WRITE32(0);
	}
	return nfserr;
}

2765
static __be32
2766
nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
L
Linus Torvalds 已提交
2767
{
2768 2769
	struct xdr_stream *xdr = &resp->xdr;

2770
	if (!nfserr)
2771
		nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2772

2773
	return nfserr;
L
Linus Torvalds 已提交
2774 2775 2776
}


2777
static __be32
2778
nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
L
Linus Torvalds 已提交
2779
{
2780
	struct xdr_stream *xdr = &resp->xdr;
2781
	__be32 *p;
L
Linus Torvalds 已提交
2782 2783

	if (!nfserr) {
2784 2785 2786
		p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
		if (!p)
			return nfserr_resource;
2787
		WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
2788
	}
2789
	return nfserr;
L
Linus Torvalds 已提交
2790 2791
}

2792
static __be32
2793
nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
L
Linus Torvalds 已提交
2794
{
2795
	struct xdr_stream *xdr = &resp->xdr;
2796
	__be32 *p;
L
Linus Torvalds 已提交
2797 2798

	if (!nfserr) {
2799 2800 2801
		p = xdr_reserve_space(xdr, 32);
		if (!p)
			return nfserr_resource;
J
J. Bruce Fields 已提交
2802
		write_cinfo(&p, &create->cr_cinfo);
L
Linus Torvalds 已提交
2803 2804 2805 2806
		WRITE32(2);
		WRITE32(create->cr_bmval[0]);
		WRITE32(create->cr_bmval[1]);
	}
2807
	return nfserr;
L
Linus Torvalds 已提交
2808 2809
}

2810 2811
static __be32
nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
L
Linus Torvalds 已提交
2812 2813
{
	struct svc_fh *fhp = getattr->ga_fhp;
2814
	struct xdr_stream *xdr = &resp->xdr;
L
Linus Torvalds 已提交
2815 2816 2817 2818

	if (nfserr)
		return nfserr;

2819 2820
	nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
				    getattr->ga_bmval,
2821
				    resp->rqstp, 0);
L
Linus Torvalds 已提交
2822 2823 2824
	return nfserr;
}

2825 2826
static __be32
nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
L
Linus Torvalds 已提交
2827
{
2828
	struct xdr_stream *xdr = &resp->xdr;
2829
	struct svc_fh *fhp = *fhpp;
L
Linus Torvalds 已提交
2830
	unsigned int len;
2831
	__be32 *p;
L
Linus Torvalds 已提交
2832 2833 2834

	if (!nfserr) {
		len = fhp->fh_handle.fh_size;
2835 2836 2837
		p = xdr_reserve_space(xdr, len + 4);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
2838 2839 2840
		WRITE32(len);
		WRITEMEM(&fhp->fh_handle.fh_base, len);
	}
2841
	return nfserr;
L
Linus Torvalds 已提交
2842 2843 2844 2845 2846 2847
}

/*
* Including all fields other than the name, a LOCK4denied structure requires
*   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
*/
2848 2849
static __be32
nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
L
Linus Torvalds 已提交
2850
{
2851
	struct xdr_netobj *conf = &ld->ld_owner;
2852
	__be32 *p;
L
Linus Torvalds 已提交
2853

2854
again:
2855
	p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2856 2857 2858 2859 2860 2861 2862 2863 2864 2865
	if (!p) {
		/*
		 * Don't fail to return the result just because we can't
		 * return the conflicting open:
		 */
		if (conf->len) {
			conf->len = 0;
			conf->data = NULL;
			goto again;
		}
2866
		return nfserr_resource;
2867
	}
L
Linus Torvalds 已提交
2868 2869 2870
	WRITE64(ld->ld_start);
	WRITE64(ld->ld_length);
	WRITE32(ld->ld_type);
2871
	if (conf->len) {
L
Linus Torvalds 已提交
2872
		WRITEMEM(&ld->ld_clientid, 8);
2873 2874
		WRITE32(conf->len);
		WRITEMEM(conf->data, conf->len);
L
Linus Torvalds 已提交
2875 2876 2877 2878
	}  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
		WRITE64((u64)0); /* clientid */
		WRITE32(0); /* length of owner name */
	}
2879
	return nfserr_denied;
L
Linus Torvalds 已提交
2880 2881
}

2882
static __be32
2883
nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
L
Linus Torvalds 已提交
2884
{
2885 2886
	struct xdr_stream *xdr = &resp->xdr;

2887
	if (!nfserr)
2888
		nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2889
	else if (nfserr == nfserr_denied)
2890
		nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2891
	kfree(lock->lk_denied.ld_owner.data);
2892
	return nfserr;
L
Linus Torvalds 已提交
2893 2894
}

2895
static __be32
2896
nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
L
Linus Torvalds 已提交
2897
{
2898 2899
	struct xdr_stream *xdr = &resp->xdr;

L
Linus Torvalds 已提交
2900
	if (nfserr == nfserr_denied)
2901
		nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2902
	return nfserr;
L
Linus Torvalds 已提交
2903 2904
}

2905
static __be32
2906
nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
L
Linus Torvalds 已提交
2907
{
2908 2909
	struct xdr_stream *xdr = &resp->xdr;

2910
	if (!nfserr)
2911
		nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2912

2913
	return nfserr;
L
Linus Torvalds 已提交
2914 2915 2916
}


2917
static __be32
2918
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
L
Linus Torvalds 已提交
2919
{
2920
	struct xdr_stream *xdr = &resp->xdr;
2921
	__be32 *p;
L
Linus Torvalds 已提交
2922 2923

	if (!nfserr) {
2924 2925 2926
		p = xdr_reserve_space(xdr, 20);
		if (!p)
			return nfserr_resource;
J
J. Bruce Fields 已提交
2927
		write_cinfo(&p, &link->li_cinfo);
L
Linus Torvalds 已提交
2928
	}
2929
	return nfserr;
L
Linus Torvalds 已提交
2930 2931 2932
}


2933
static __be32
2934
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
L
Linus Torvalds 已提交
2935
{
2936
	struct xdr_stream *xdr = &resp->xdr;
2937
	__be32 *p;
L
Linus Torvalds 已提交
2938 2939 2940 2941

	if (nfserr)
		goto out;

2942 2943 2944 2945 2946 2947
	nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
	if (nfserr)
		goto out;
	p = xdr_reserve_space(xdr, 40);
	if (!p)
		return nfserr_resource;
J
J. Bruce Fields 已提交
2948
	write_cinfo(&p, &open->op_cinfo);
L
Linus Torvalds 已提交
2949 2950 2951 2952 2953 2954 2955 2956 2957 2958
	WRITE32(open->op_rflags);
	WRITE32(2);
	WRITE32(open->op_bmval[0]);
	WRITE32(open->op_bmval[1]);
	WRITE32(open->op_delegate_type);

	switch (open->op_delegate_type) {
	case NFS4_OPEN_DELEGATE_NONE:
		break;
	case NFS4_OPEN_DELEGATE_READ:
2959 2960 2961 2962 2963 2964
		nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
		if (nfserr)
			return nfserr;
		p = xdr_reserve_space(xdr, 20);
		if (!p)
			return nfserr_resource;
2965
		WRITE32(open->op_recall);
L
Linus Torvalds 已提交
2966 2967 2968 2969 2970 2971 2972 2973 2974 2975

		/*
		 * TODO: ACE's in delegations
		 */
		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
		WRITE32(0);
		WRITE32(0);
		WRITE32(0);   /* XXX: is NULL principal ok? */
		break;
	case NFS4_OPEN_DELEGATE_WRITE:
2976 2977 2978 2979 2980 2981
		nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
		if (nfserr)
			return nfserr;
		p = xdr_reserve_space(xdr, 32);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998
		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? */
		break;
2999 3000 3001 3002
	case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
		switch (open->op_why_no_deleg) {
		case WND4_CONTENTION:
		case WND4_RESOURCE:
3003 3004 3005
			p = xdr_reserve_space(xdr, 8);
			if (!p)
				return nfserr_resource;
3006 3007 3008 3009
			WRITE32(open->op_why_no_deleg);
			WRITE32(0);	/* deleg signaling not supported yet */
			break;
		default:
3010 3011 3012
			p = xdr_reserve_space(xdr, 4);
			if (!p)
				return nfserr_resource;
3013 3014 3015
			WRITE32(open->op_why_no_deleg);
		}
		break;
L
Linus Torvalds 已提交
3016 3017 3018 3019 3020
	default:
		BUG();
	}
	/* XXX save filehandle here */
out:
3021
	return nfserr;
L
Linus Torvalds 已提交
3022 3023
}

3024
static __be32
3025
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
L
Linus Torvalds 已提交
3026
{
3027 3028
	struct xdr_stream *xdr = &resp->xdr;

3029
	if (!nfserr)
3030
		nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
L
Linus Torvalds 已提交
3031

3032
	return nfserr;
L
Linus Torvalds 已提交
3033 3034
}

3035
static __be32
3036
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
L
Linus Torvalds 已提交
3037
{
3038 3039
	struct xdr_stream *xdr = &resp->xdr;

3040
	if (!nfserr)
3041
		nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
L
Linus Torvalds 已提交
3042

3043
	return nfserr;
L
Linus Torvalds 已提交
3044 3045
}

3046 3047
static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3048
		  struct nfsd4_read *read)
L
Linus Torvalds 已提交
3049 3050
{
	u32 eof;
3051 3052
	int v;
	struct page *page;
L
Linus Torvalds 已提交
3053
	unsigned long maxcount; 
3054
	struct xdr_stream *xdr = &resp->xdr;
J
J. Bruce Fields 已提交
3055
	int starting_len = xdr->buf->len;
3056
	int space_left;
L
Linus Torvalds 已提交
3057
	long len;
3058
	__be32 *p;
L
Linus Torvalds 已提交
3059 3060 3061 3062

	if (nfserr)
		return nfserr;

3063 3064 3065
	p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
	if (!p)
		return nfserr_resource;
L
Linus Torvalds 已提交
3066

3067 3068 3069 3070
	/* Make sure there will be room for padding if needed: */
	if (xdr->end - xdr->p < 1)
		return nfserr_resource;

3071 3072 3073
	if (resp->xdr.buf->page_len)
		return nfserr_resource;

3074
	maxcount = svc_max_payload(resp->rqstp);
L
Linus Torvalds 已提交
3075 3076 3077 3078 3079
	if (maxcount > read->rd_length)
		maxcount = read->rd_length;

	len = maxcount;
	v = 0;
3080 3081 3082
	while (len) {
		int thislen;

3083 3084
		page = *(resp->rqstp->rq_next_page);
		if (!page) { /* ran out of pages */
3085 3086 3087
			maxcount -= len;
			break;
		}
3088
		thislen = min_t(long, len, PAGE_SIZE);
3089
		resp->rqstp->rq_vec[v].iov_base = page_address(page);
3090
		resp->rqstp->rq_vec[v].iov_len = thislen;
3091
		resp->rqstp->rq_next_page++;
L
Linus Torvalds 已提交
3092
		v++;
3093
		len -= thislen;
L
Linus Torvalds 已提交
3094 3095 3096
	}
	read->rd_vlen = v;

3097
	nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
3098
			read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
L
Linus Torvalds 已提交
3099 3100
			&maxcount);

3101
	if (nfserr) {
J
J. Bruce Fields 已提交
3102 3103 3104 3105 3106 3107 3108
		/*
		 * nfsd_splice_actor may have already messed with the
		 * page length; reset it so as not to confuse
		 * xdr_truncate_encode:
		 */
		xdr->buf->page_len = 0;
		xdr_truncate_encode(xdr, starting_len);
L
Linus Torvalds 已提交
3109
		return nfserr;
3110
	}
3111 3112
	eof = (read->rd_offset + maxcount >=
	       read->rd_fhp->fh_dentry->d_inode->i_size);
L
Linus Torvalds 已提交
3113 3114 3115

	WRITE32(eof);
	WRITE32(maxcount);
3116 3117
	WARN_ON_ONCE(resp->xdr.buf->head[0].iov_len != (char *)p
				- (char *)resp->xdr.buf->head[0].iov_base);
3118
	resp->xdr.buf->page_len = maxcount;
3119
	xdr->buf->len += maxcount;
3120
	xdr->page_ptr += v;
3121
	xdr->iov = xdr->buf->tail;
L
Linus Torvalds 已提交
3122

3123
	/* Use rest of head for padding and remaining ops: */
3124 3125
	resp->xdr.buf->tail[0].iov_base = p;
	resp->xdr.buf->tail[0].iov_len = 0;
L
Linus Torvalds 已提交
3126
	if (maxcount&3) {
3127
		p = xdr_reserve_space(xdr, 4);
3128
		WRITE32(0);
3129 3130
		resp->xdr.buf->tail[0].iov_base += maxcount&3;
		resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
3131
		xdr->buf->len -= (maxcount&3);
L
Linus Torvalds 已提交
3132
	}
3133 3134 3135 3136 3137 3138

	space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
				xdr->buf->buflen - xdr->buf->len);
	xdr->buf->buflen = xdr->buf->len + space_left;
	xdr->end = (__be32 *)((void *)xdr->end + space_left);

L
Linus Torvalds 已提交
3139 3140 3141
	return 0;
}

3142 3143
static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
L
Linus Torvalds 已提交
3144 3145
{
	int maxcount;
3146
	struct xdr_stream *xdr = &resp->xdr;
L
Linus Torvalds 已提交
3147
	char *page;
J
J. Bruce Fields 已提交
3148
	int length_offset = xdr->buf->len;
3149
	__be32 *p;
L
Linus Torvalds 已提交
3150 3151 3152

	if (nfserr)
		return nfserr;
3153 3154 3155 3156 3157

	p = xdr_reserve_space(xdr, 4);
	if (!p)
		return nfserr_resource;

3158
	if (resp->xdr.buf->page_len)
L
Linus Torvalds 已提交
3159
		return nfserr_resource;
3160
	if (!*resp->rqstp->rq_next_page)
3161
		return nfserr_resource;
L
Linus Torvalds 已提交
3162

3163
	page = page_address(*(resp->rqstp->rq_next_page++));
L
Linus Torvalds 已提交
3164 3165

	maxcount = PAGE_SIZE;
3166

3167 3168 3169
	if (xdr->end - xdr->p < 1)
		return nfserr_resource;

L
Linus Torvalds 已提交
3170 3171 3172 3173 3174 3175 3176 3177
	/*
	 * 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)
3178 3179
		nfserr = nfserr_inval;
	if (nfserr) {
J
J. Bruce Fields 已提交
3180
		xdr_truncate_encode(xdr, length_offset);
L
Linus Torvalds 已提交
3181
		return nfserr;
3182
	}
L
Linus Torvalds 已提交
3183 3184

	WRITE32(maxcount);
3185 3186 3187
	resp->xdr.buf->head[0].iov_len = (char *)p
				- (char *)resp->xdr.buf->head[0].iov_base;
	resp->xdr.buf->page_len = maxcount;
3188
	xdr->buf->len += maxcount;
3189 3190
	xdr->page_ptr += 1;
	xdr->buf->buflen -= PAGE_SIZE;
3191
	xdr->iov = xdr->buf->tail;
L
Linus Torvalds 已提交
3192

3193
	/* Use rest of head for padding and remaining ops: */
3194 3195
	resp->xdr.buf->tail[0].iov_base = p;
	resp->xdr.buf->tail[0].iov_len = 0;
L
Linus Torvalds 已提交
3196
	if (maxcount&3) {
3197
		p = xdr_reserve_space(xdr, 4);
3198
		WRITE32(0);
3199 3200
		resp->xdr.buf->tail[0].iov_base += maxcount&3;
		resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
L
Linus Torvalds 已提交
3201 3202 3203 3204
	}
	return 0;
}

3205 3206
static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
L
Linus Torvalds 已提交
3207 3208 3209
{
	int maxcount;
	loff_t offset;
3210
	struct xdr_stream *xdr = &resp->xdr;
J
J. Bruce Fields 已提交
3211 3212
	int starting_len = xdr->buf->len;
	__be32 *page, *tailbase;
3213
	__be32 *p;
L
Linus Torvalds 已提交
3214 3215 3216 3217

	if (nfserr)
		return nfserr;

3218 3219 3220
	p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
	if (!p)
		return nfserr_resource;
L
Linus Torvalds 已提交
3221

3222 3223 3224 3225 3226
	if (resp->xdr.buf->page_len)
		return nfserr_resource;
	if (!*resp->rqstp->rq_next_page)
		return nfserr_resource;

L
Linus Torvalds 已提交
3227 3228 3229
	/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
	WRITE32(0);
	WRITE32(0);
3230 3231
	resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
				- (char *)resp->xdr.buf->head[0].iov_base;
3232
	tailbase = p;
L
Linus Torvalds 已提交
3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248

	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;
	}

3249
	page = page_address(*(resp->rqstp->rq_next_page++));
L
Linus Torvalds 已提交
3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271
	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);
3272
	resp->xdr.buf->page_len = ((char *)p) -
3273
		(char*)page_address(*(resp->rqstp->rq_next_page-1));
3274
	xdr->buf->len += xdr->buf->page_len;
L
Linus Torvalds 已提交
3275

3276 3277
	xdr->iov = xdr->buf->tail;

3278 3279 3280 3281
	xdr->page_ptr++;
	xdr->buf->buflen -= PAGE_SIZE;
	xdr->iov = xdr->buf->tail;

3282
	/* Use rest of head for padding and remaining ops: */
3283 3284 3285 3286 3287
	resp->xdr.buf->tail[0].iov_base = tailbase;
	resp->xdr.buf->tail[0].iov_len = 0;
	resp->xdr.p = resp->xdr.buf->tail[0].iov_base;
	resp->xdr.end = resp->xdr.p +
			(PAGE_SIZE - resp->xdr.buf->head[0].iov_len)/4;
L
Linus Torvalds 已提交
3288 3289 3290

	return 0;
err_no_verf:
J
J. Bruce Fields 已提交
3291
	xdr_truncate_encode(xdr, starting_len);
L
Linus Torvalds 已提交
3292 3293 3294
	return nfserr;
}

3295
static __be32
3296
nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
L
Linus Torvalds 已提交
3297
{
3298
	struct xdr_stream *xdr = &resp->xdr;
3299
	__be32 *p;
L
Linus Torvalds 已提交
3300 3301

	if (!nfserr) {
3302 3303 3304
		p = xdr_reserve_space(xdr, 20);
		if (!p)
			return nfserr_resource;
J
J. Bruce Fields 已提交
3305
		write_cinfo(&p, &remove->rm_cinfo);
L
Linus Torvalds 已提交
3306
	}
3307
	return nfserr;
L
Linus Torvalds 已提交
3308 3309
}

3310
static __be32
3311
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
L
Linus Torvalds 已提交
3312
{
3313
	struct xdr_stream *xdr = &resp->xdr;
3314
	__be32 *p;
L
Linus Torvalds 已提交
3315 3316

	if (!nfserr) {
3317 3318 3319
		p = xdr_reserve_space(xdr, 40);
		if (!p)
			return nfserr_resource;
J
J. Bruce Fields 已提交
3320 3321
		write_cinfo(&p, &rename->rn_sinfo);
		write_cinfo(&p, &rename->rn_tinfo);
L
Linus Torvalds 已提交
3322
	}
3323
	return nfserr;
L
Linus Torvalds 已提交
3324 3325
}

3326
static __be32
3327
nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3328
			 __be32 nfserr, struct svc_export *exp)
A
Andy Adamson 已提交
3329
{
3330
	u32 i, nflavs, supported;
3331 3332
	struct exp_flavor_info *flavs;
	struct exp_flavor_info def_flavs[2];
3333 3334
	__be32 *p, *flavorsp;
	static bool report = true;
A
Andy Adamson 已提交
3335 3336 3337

	if (nfserr)
		goto out;
3338
	nfserr = nfserr_resource;
3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358
	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;
		}
	}

3359
	supported = 0;
3360 3361 3362
	p = xdr_reserve_space(xdr, 4);
	if (!p)
		goto out;
3363 3364
	flavorsp = p++;		/* to be backfilled later */

3365
	for (i = 0; i < nflavs; i++) {
3366
		rpc_authflavor_t pf = flavs[i].pseudoflavor;
3367
		struct rpcsec_gss_info info;
A
Andy Adamson 已提交
3368

3369 3370
		if (rpcauth_get_gssinfo(pf, &info) == 0) {
			supported++;
3371 3372 3373 3374
			p = xdr_reserve_space(xdr, 4 + 4 +
					      XDR_LEN(info.oid.len) + 4 + 4);
			if (!p)
				goto out;
A
Andy Adamson 已提交
3375
			WRITE32(RPC_AUTH_GSS);
3376 3377 3378 3379
			WRITE32(info.oid.len);
			WRITEMEM(info.oid.data, info.oid.len);
			WRITE32(info.qop);
			WRITE32(info.service);
3380 3381
		} else if (pf < RPC_AUTH_MAXFLAVOR) {
			supported++;
3382 3383 3384
			p = xdr_reserve_space(xdr, 4);
			if (!p)
				goto out;
3385 3386 3387 3388 3389
			WRITE32(pf);
		} else {
			if (report)
				pr_warn("NFS: SECINFO: security flavor %u "
					"is not supported\n", pf);
A
Andy Adamson 已提交
3390 3391
		}
	}
3392

3393 3394 3395
	if (nflavs != supported)
		report = false;
	*flavorsp = htonl(supported);
3396
	nfserr = 0;
A
Andy Adamson 已提交
3397 3398 3399
out:
	if (exp)
		exp_put(exp);
3400
	return nfserr;
A
Andy Adamson 已提交
3401 3402
}

3403 3404 3405 3406
static __be32
nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
		     struct nfsd4_secinfo *secinfo)
{
3407 3408 3409
	struct xdr_stream *xdr = &resp->xdr;

	return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3410 3411 3412 3413 3414 3415
}

static __be32
nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
		     struct nfsd4_secinfo_no_name *secinfo)
{
3416 3417 3418
	struct xdr_stream *xdr = &resp->xdr;

	return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3419 3420
}

L
Linus Torvalds 已提交
3421 3422 3423 3424
/*
 * The SETATTR encode routine is special -- it always encodes a bitmap,
 * regardless of the error status.
 */
3425
static __be32
3426
nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
L
Linus Torvalds 已提交
3427
{
3428
	struct xdr_stream *xdr = &resp->xdr;
3429
	__be32 *p;
L
Linus Torvalds 已提交
3430

3431 3432 3433
	p = xdr_reserve_space(xdr, 16);
	if (!p)
		return nfserr_resource;
L
Linus Torvalds 已提交
3434
	if (nfserr) {
3435 3436
		WRITE32(3);
		WRITE32(0);
L
Linus Torvalds 已提交
3437 3438 3439 3440
		WRITE32(0);
		WRITE32(0);
	}
	else {
3441
		WRITE32(3);
L
Linus Torvalds 已提交
3442 3443
		WRITE32(setattr->sa_bmval[0]);
		WRITE32(setattr->sa_bmval[1]);
3444
		WRITE32(setattr->sa_bmval[2]);
L
Linus Torvalds 已提交
3445
	}
3446
	return nfserr;
L
Linus Torvalds 已提交
3447 3448
}

3449
static __be32
3450
nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
L
Linus Torvalds 已提交
3451
{
3452
	struct xdr_stream *xdr = &resp->xdr;
3453
	__be32 *p;
L
Linus Torvalds 已提交
3454 3455

	if (!nfserr) {
3456 3457 3458
		p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
3459
		WRITEMEM(&scd->se_clientid, 8);
3460
		WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3461 3462
	}
	else if (nfserr == nfserr_clid_inuse) {
3463 3464 3465
		p = xdr_reserve_space(xdr, 8);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
3466 3467 3468
		WRITE32(0);
		WRITE32(0);
	}
3469
	return nfserr;
L
Linus Torvalds 已提交
3470 3471
}

3472
static __be32
3473
nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
L
Linus Torvalds 已提交
3474
{
3475
	struct xdr_stream *xdr = &resp->xdr;
3476
	__be32 *p;
L
Linus Torvalds 已提交
3477 3478

	if (!nfserr) {
3479 3480 3481
		p = xdr_reserve_space(xdr, 16);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
3482 3483
		WRITE32(write->wr_bytes_written);
		WRITE32(write->wr_how_written);
3484
		WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3485
	}
3486
	return nfserr;
L
Linus Torvalds 已提交
3487 3488
}

3489 3490 3491 3492 3493 3494 3495 3496
static const u32 nfs4_minimal_spo_must_enforce[2] = {
	[1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
	      1 << (OP_EXCHANGE_ID - 32) |
	      1 << (OP_CREATE_SESSION - 32) |
	      1 << (OP_DESTROY_SESSION - 32) |
	      1 << (OP_DESTROY_CLIENTID - 32)
};

A
Andy Adamson 已提交
3497
static __be32
J
J. Bruce Fields 已提交
3498
nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3499 3500
			 struct nfsd4_exchange_id *exid)
{
3501
	struct xdr_stream *xdr = &resp->xdr;
3502
	__be32 *p;
A
Andy Adamson 已提交
3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516
	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);

3517
	p = xdr_reserve_space(xdr,
A
Andy Adamson 已提交
3518 3519 3520
		8 /* eir_clientid */ +
		4 /* eir_sequenceid */ +
		4 /* eir_flags */ +
3521
		4 /* spr_how */);
3522 3523
	if (!p)
		return nfserr_resource;
A
Andy Adamson 已提交
3524 3525 3526 3527 3528 3529

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

	WRITE32(exid->spa_how);
3530

3531 3532 3533 3534
	switch (exid->spa_how) {
	case SP4_NONE:
		break;
	case SP4_MACH_CRED:
3535
		/* spo_must_enforce, spo_must_allow */
3536 3537 3538
		p = xdr_reserve_space(xdr, 16);
		if (!p)
			return nfserr_resource;
3539

3540 3541 3542 3543 3544 3545
		/* spo_must_enforce bitmap: */
		WRITE32(2);
		WRITE32(nfs4_minimal_spo_must_enforce[0]);
		WRITE32(nfs4_minimal_spo_must_enforce[1]);
		/* empty spo_must_allow bitmap: */
		WRITE32(0);
3546

3547 3548 3549 3550
		break;
	default:
		WARN_ON_ONCE(1);
	}
A
Andy Adamson 已提交
3551

3552
	p = xdr_reserve_space(xdr,
3553 3554 3555 3556 3557 3558
		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) */);
3559 3560
	if (!p)
		return nfserr_resource;
3561

A
Andy Adamson 已提交
3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574
	/* 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 */
	return 0;
A
Andy Adamson 已提交
3575 3576 3577
}

static __be32
J
J. Bruce Fields 已提交
3578
nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3579 3580
			    struct nfsd4_create_session *sess)
{
3581
	struct xdr_stream *xdr = &resp->xdr;
3582
	__be32 *p;
A
Andy Adamson 已提交
3583 3584 3585 3586

	if (nfserr)
		return nfserr;

3587 3588 3589
	p = xdr_reserve_space(xdr, 24);
	if (!p)
		return nfserr_resource;
A
Andy Adamson 已提交
3590 3591 3592 3593
	WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
	WRITE32(sess->seqid);
	WRITE32(sess->flags);

3594 3595 3596
	p = xdr_reserve_space(xdr, 28);
	if (!p)
		return nfserr_resource;
A
Andy Adamson 已提交
3597 3598 3599 3600 3601 3602 3603 3604 3605
	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);

	if (sess->fore_channel.nr_rdma_attrs) {
3606 3607 3608
		p = xdr_reserve_space(xdr, 4);
		if (!p)
			return nfserr_resource;
A
Andy Adamson 已提交
3609 3610 3611
		WRITE32(sess->fore_channel.rdma_attrs);
	}

3612 3613 3614
	p = xdr_reserve_space(xdr, 28);
	if (!p)
		return nfserr_resource;
A
Andy Adamson 已提交
3615 3616 3617 3618 3619 3620 3621 3622 3623
	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);

	if (sess->back_channel.nr_rdma_attrs) {
3624 3625 3626
		p = xdr_reserve_space(xdr, 4);
		if (!p)
			return nfserr_resource;
A
Andy Adamson 已提交
3627 3628 3629
		WRITE32(sess->back_channel.rdma_attrs);
	}
	return 0;
A
Andy Adamson 已提交
3630 3631
}

D
Daniel Mack 已提交
3632
static __be32
J
J. Bruce Fields 已提交
3633
nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3634 3635
		      struct nfsd4_sequence *seq)
{
3636
	struct xdr_stream *xdr = &resp->xdr;
3637
	__be32 *p;
B
Benny Halevy 已提交
3638 3639 3640 3641

	if (nfserr)
		return nfserr;

3642 3643 3644
	p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
	if (!p)
		return nfserr_resource;
B
Benny Halevy 已提交
3645 3646 3647
	WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
	WRITE32(seq->seqid);
	WRITE32(seq->slotid);
3648 3649 3650
	/* Note slotid's are numbered from zero: */
	WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
	WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3651
	WRITE32(seq->status_flags);
B
Benny Halevy 已提交
3652

3653
	resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
B
Benny Halevy 已提交
3654
	return 0;
A
Andy Adamson 已提交
3655 3656
}

J
J. Bruce Fields 已提交
3657
static __be32
J
J. Bruce Fields 已提交
3658
nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3659 3660
			  struct nfsd4_test_stateid *test_stateid)
{
3661
	struct xdr_stream *xdr = &resp->xdr;
3662
	struct nfsd4_test_stateid_id *stateid, *next;
3663 3664
	__be32 *p;

3665 3666 3667
	if (nfserr)
		return nfserr;

3668 3669 3670
	p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
	if (!p)
		return nfserr_resource;
3671 3672
	*p++ = htonl(test_stateid->ts_num_ids);

3673
	list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3674
		*p++ = stateid->ts_id_status;
3675 3676 3677 3678 3679
	}

	return nfserr;
}

3680 3681 3682 3683 3684 3685 3686 3687
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
3688 3689 3690 3691 3692
/*
 * 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.
 */
3693
static nfsd4_enc nfsd4_enc_ops[] = {
3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709
	[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,
3710
	[OP_OPENATTR]		= (nfsd4_enc)nfsd4_encode_noop,
3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730
	[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
3731 3732 3733

	/* NFSv4.1 operations */
	[OP_BACKCHANNEL_CTL]	= (nfsd4_enc)nfsd4_encode_noop,
3734
	[OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
A
Andy Adamson 已提交
3735 3736
	[OP_EXCHANGE_ID]	= (nfsd4_enc)nfsd4_encode_exchange_id,
	[OP_CREATE_SESSION]	= (nfsd4_enc)nfsd4_encode_create_session,
3737 3738
	[OP_DESTROY_SESSION]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_FREE_STATEID]	= (nfsd4_enc)nfsd4_encode_noop,
A
Andy Adamson 已提交
3739 3740 3741 3742 3743 3744
	[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,
3745
	[OP_SECINFO_NO_NAME]	= (nfsd4_enc)nfsd4_encode_secinfo_no_name,
A
Andy Adamson 已提交
3746 3747
	[OP_SEQUENCE]		= (nfsd4_enc)nfsd4_encode_sequence,
	[OP_SET_SSV]		= (nfsd4_enc)nfsd4_encode_noop,
3748
	[OP_TEST_STATEID]	= (nfsd4_enc)nfsd4_encode_test_stateid,
A
Andy Adamson 已提交
3749 3750 3751
	[OP_WANT_DELEGATION]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_DESTROY_CLIENTID]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_RECLAIM_COMPLETE]	= (nfsd4_enc)nfsd4_encode_noop,
3752 3753
};

3754
/*
J
J. Bruce Fields 已提交
3755 3756 3757 3758 3759 3760
 * Calculate whether we still have space to encode repsize bytes.
 * There are two considerations:
 *     - For NFS versions >=4.1, the size of the reply must stay within
 *       session limits
 *     - For all NFS versions, we must stay within limited preallocated
 *       buffer space.
3761
 *
J
J. Bruce Fields 已提交
3762 3763 3764 3765
 * This is called before the operation is processed, so can only provide
 * an upper estimate.  For some nonidempotent operations (such as
 * getattr), it's not necessarily a problem if that estimate is wrong,
 * as we can fail it after processing without significant side effects.
3766
 */
J
J. Bruce Fields 已提交
3767
__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3768
{
3769
	struct xdr_buf *buf = &resp->rqstp->rq_res;
3770
	struct nfsd4_session *session = resp->cstate.session;
3771

3772
	if (nfsd4_has_session(&resp->cstate)) {
J
J. Bruce Fields 已提交
3773
		struct nfsd4_slot *slot = resp->cstate.slot;
3774

J
J. Bruce Fields 已提交
3775
		if (buf->len + respsize > session->se_fchannel.maxresp_sz)
3776
			return nfserr_rep_too_big;
3777

3778
		if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
J
J. Bruce Fields 已提交
3779
		    buf->len + respsize > session->se_fchannel.maxresp_cached)
3780 3781
			return nfserr_rep_too_big_to_cache;
	}
3782

3783
	if (buf->len + respsize > buf->buflen) {
3784 3785 3786
		WARN_ON_ONCE(nfsd4_has_session(&resp->cstate));
		return nfserr_resource;
	}
3787 3788

	return 0;
3789 3790
}

L
Linus Torvalds 已提交
3791 3792 3793
void
nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
3794
	struct xdr_stream *xdr = &resp->xdr;
3795
	struct nfs4_stateowner *so = resp->cstate.replay_owner;
3796
	struct svc_rqst *rqstp = resp->rqstp;
3797
	int post_err_offset;
3798
	nfsd4_enc encoder;
3799
	__be32 *p;
L
Linus Torvalds 已提交
3800

3801 3802 3803 3804 3805
	p = xdr_reserve_space(xdr, 8);
	if (!p) {
		WARN_ON_ONCE(1);
		return;
	}
L
Linus Torvalds 已提交
3806
	WRITE32(op->opnum);
3807
	post_err_offset = xdr->buf->len;
L
Linus Torvalds 已提交
3808

3809 3810 3811 3812
	if (op->opnum == OP_ILLEGAL)
		goto status;
	BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
	       !nfsd4_enc_ops[op->opnum]);
3813 3814
	encoder = nfsd4_enc_ops[op->opnum];
	op->status = encoder(resp, op->status, &op->u);
3815 3816
	xdr_commit_encode(xdr);

3817
	/* nfsd4_check_resp_size guarantees enough room for error status */
3818 3819 3820 3821 3822 3823
	if (!op->status) {
		int space_needed = 0;
		if (!nfsd4_last_compound_op(rqstp))
			space_needed = COMPOUND_ERR_SLACK_SPACE;
		op->status = nfsd4_check_resp_size(resp, space_needed);
	}
3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834
	if (op->status == nfserr_resource ||
	    op->status == nfserr_rep_too_big ||
	    op->status == nfserr_rep_too_big_to_cache) {
		/*
		 * The operation may have already been encoded or
		 * partially encoded.  No op returns anything additional
		 * in the case of one of these three errors, so we can
		 * just truncate back to after the status.  But it's a
		 * bug if we had to do this on a non-idempotent op:
		 */
		warn_on_nonidempotent_op(op);
3835
		xdr_truncate_encode(xdr, post_err_offset);
3836
	}
3837
	if (so) {
3838 3839
		int len = xdr->buf->len - post_err_offset;

3840
		so->so_replay.rp_status = op->status;
3841 3842 3843
		so->so_replay.rp_buflen = len;
		read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
						so->so_replay.rp_buf, len);
3844
	}
3845
status:
3846 3847
	/* Note that op->status is already in network byte order: */
	write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
L
Linus Torvalds 已提交
3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858
}

/* 
 * 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
3859
nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
L
Linus Torvalds 已提交
3860
{
3861
	__be32 *p;
L
Linus Torvalds 已提交
3862 3863 3864 3865
	struct nfs4_replay *rp = op->replay;

	BUG_ON(!rp);

3866 3867 3868 3869 3870
	p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
	if (!p) {
		WARN_ON_ONCE(1);
		return;
	}
L
Linus Torvalds 已提交
3871 3872 3873 3874 3875 3876 3877
	WRITE32(op->opnum);
	*p++ = rp->rp_status;  /* already xdr'ed */

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

int
A
Al Viro 已提交
3878
nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
L
Linus Torvalds 已提交
3879 3880 3881 3882
{
        return xdr_ressize_check(rqstp, p);
}

3883
int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
L
Linus Torvalds 已提交
3884
{
3885 3886 3887
	struct svc_rqst *rqstp = rq;
	struct nfsd4_compoundargs *args = rqstp->rq_argp;

L
Linus Torvalds 已提交
3888 3889 3890 3891
	if (args->ops != args->iops) {
		kfree(args->ops);
		args->ops = args->iops;
	}
J
Jesper Juhl 已提交
3892 3893
	kfree(args->tmpp);
	args->tmpp = NULL;
L
Linus Torvalds 已提交
3894 3895 3896 3897 3898 3899
	while (args->to_free) {
		struct tmpbuf *tb = args->to_free;
		args->to_free = tb->next;
		tb->release(tb->buf);
		kfree(tb);
	}
3900
	return 1;
L
Linus Torvalds 已提交
3901 3902 3903
}

int
A
Al Viro 已提交
3904
nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
L
Linus Torvalds 已提交
3905
{
3906 3907 3908 3909 3910 3911
	if (rqstp->rq_arg.head[0].iov_len % 4) {
		/* client is nuts */
		dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
			__func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
		return 0;
	}
L
Linus Torvalds 已提交
3912 3913 3914 3915 3916 3917 3918 3919 3920
	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;

3921
	return !nfsd4_decode_compound(args);
L
Linus Torvalds 已提交
3922 3923 3924
}

int
A
Al Viro 已提交
3925
nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
L
Linus Torvalds 已提交
3926 3927 3928 3929
{
	/*
	 * All that remains is to write the tag and operation count...
	 */
3930
	struct nfsd4_compound_state *cs = &resp->cstate;
3931 3932 3933 3934
	struct xdr_buf *buf = resp->xdr.buf;

	WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
				 buf->tail[0].iov_len);
3935

3936 3937
	rqstp->rq_next_page = resp->xdr.page_ptr + 1;

L
Linus Torvalds 已提交
3938 3939 3940 3941 3942 3943
	p = resp->tagp;
	*p++ = htonl(resp->taglen);
	memcpy(p, resp->tag, resp->taglen);
	p += XDR_QUADLEN(resp->taglen);
	*p++ = htonl(resp->opcnt);

3944
	if (nfsd4_has_session(cs)) {
3945 3946
		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
		struct nfs4_client *clp = cs->session->se_client;
3947 3948
		if (cs->status != nfserr_replay_cache) {
			nfsd4_store_cache_entry(resp);
3949
			cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3950
		}
3951
		/* Renew the clientid on success and on replay */
3952
		spin_lock(&nn->client_lock);
3953
		nfsd4_put_session(cs->session);
3954 3955
		spin_unlock(&nn->client_lock);
		put_client_renew(clp);
A
Andy Adamson 已提交
3956
	}
L
Linus Torvalds 已提交
3957 3958 3959 3960 3961 3962 3963 3964
	return 1;
}

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