nfs4xdr.c 92.8 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 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633
/*
 * Return a rough estimate of the maximum possible reply size.  Note the
 * estimate includes rpc headers so is meant to be passed to
 * svc_reserve, not svc_reserve_auth.
 *
 * Also note the current compound encoding permits only one operation to
 * use pages beyond the first one, so the maximum possible length is the
 * maximum over these values, not the sum.
 */
static int nfsd4_max_reply(u32 opnum)
{
	switch (opnum) {
	case OP_READLINK:
	case OP_READDIR:
		/*
		 * Both of these ops take a single page for data and put
		 * the head and tail in another page:
		 */
		return 2 * PAGE_SIZE;
	case OP_READ:
		return INT_MAX;
	default:
		return PAGE_SIZE;
	}
}

1634
static __be32
L
Linus Torvalds 已提交
1635 1636 1637 1638
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
	DECODE_HEAD;
	struct nfsd4_op *op;
1639
	bool cachethis = false;
1640
	int max_reply = PAGE_SIZE;
L
Linus Torvalds 已提交
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654
	int i;

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

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

1655
	if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
L
Linus Torvalds 已提交
1656 1657 1658
		argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
		if (!argp->ops) {
			argp->ops = argp->iops;
1659
			dprintk("nfsd: couldn't allocate room for COMPOUND\n");
L
Linus Torvalds 已提交
1660 1661 1662 1663
			goto xdr_error;
		}
	}

1664
	if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1665 1666
		argp->opcnt = 0;

L
Linus Torvalds 已提交
1667 1668 1669 1670
	for (i = 0; i < argp->opcnt; i++) {
		op = &argp->ops[i];
		op->replay = NULL;

J
J. Bruce Fields 已提交
1671 1672
		READ_BUF(4);
		READ32(op->opnum);
L
Linus Torvalds 已提交
1673

1674 1675
		if (nfsd4_opnum_in_range(argp, op))
			op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1676
		else {
L
Linus Torvalds 已提交
1677 1678 1679
			op->opnum = OP_ILLEGAL;
			op->status = nfserr_op_illegal;
		}
1680 1681 1682 1683 1684
		/*
		 * 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);
1685 1686

		max_reply = max(max_reply, nfsd4_max_reply(op->opnum));
1687 1688 1689 1690 1691

		if (op->status) {
			argp->opcnt = i+1;
			break;
		}
L
Linus Torvalds 已提交
1692
	}
1693 1694 1695
	/* Sessions make the DRC unnecessary: */
	if (argp->minorversion)
		cachethis = false;
1696 1697
	if (max_reply != INT_MAX)
		svc_reserve(argp->rqstp, max_reply);
1698
	argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
L
Linus Torvalds 已提交
1699 1700 1701 1702 1703 1704 1705 1706 1707

	DECODE_TAIL;
}

#define WRITE32(n)               *p++ = htonl(n)
#define WRITE64(n)               do {				\
	*p++ = htonl((u32)((n) >> 32));				\
	*p++ = htonl((u32)(n));					\
} while (0)
1708
#define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {		\
L
Linus Torvalds 已提交
1709 1710 1711
	*(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
	memcpy(p, ptr, nbytes);					\
	p += XDR_QUADLEN(nbytes);				\
1712
}} while (0)
J
J. Bruce Fields 已提交
1713 1714 1715

static void write32(__be32 **p, u32 n)
{
1716
	*(*p)++ = htonl(n);
J
J. Bruce Fields 已提交
1717 1718 1719 1720
}

static void write64(__be32 **p, u64 n)
{
1721
	write32(p, (n >> 32));
J
J. Bruce Fields 已提交
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747
	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
1748 1749

#define RESERVE_SPACE(nbytes)	do {				\
1750 1751
	p = xdr_reserve_space(&resp->xdr, nbytes);		\
	BUG_ON(!p);						\
L
Linus Torvalds 已提交
1752 1753
} while (0)

1754
/* Encode as an array of strings the string given with components
1755
 * separated @sep, escaped with esc_enter and esc_exit.
1756
 */
1757 1758 1759
static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
					  char *components, char esc_enter,
					  char esc_exit)
1760
{
1761 1762
	__be32 *p;
	__be32 *countp;
1763
	int strlen, count=0;
1764
	char *str, *end, *next;
1765 1766

	dprintk("nfsd4_encode_components(%s)\n", components);
1767 1768
	p = xdr_reserve_space(xdr, 4);
	if (!p)
1769
		return nfserr_resource;
1770
	countp = p;
1771 1772 1773
	WRITE32(0); /* We will fill this in with @count later */
	end = str = components;
	while (*end) {
1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790
		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 */;

1791 1792
		strlen = end - str;
		if (strlen) {
1793 1794
			p = xdr_reserve_space(xdr, strlen + 4);
			if (!p)
1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808
				return nfserr_resource;
			WRITE32(strlen);
			WRITEMEM(str, strlen);
			count++;
		}
		else
			end++;
		str = end;
	}
	p = countp;
	WRITE32(count);
	return 0;
}

1809 1810 1811
/* Encode as an array of strings the string given with components
 * separated @sep.
 */
1812 1813
static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
				      char *components)
1814
{
1815
	return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1816 1817
}

1818 1819 1820
/*
 * encode a location element of a fs_locations structure
 */
1821 1822
static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
					struct nfsd4_fs_location *location)
1823
{
1824
	__be32 status;
1825

1826
	status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1827
						'[', ']');
1828 1829
	if (status)
		return status;
1830
	status = nfsd4_encode_components(xdr, '/', location->path);
1831 1832 1833 1834 1835 1836
	if (status)
		return status;
	return 0;
}

/*
T
Trond Myklebust 已提交
1837
 * Encode a path in RFC3530 'pathname4' format
1838
 */
1839 1840 1841
static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
				const struct path *root,
				const struct path *path)
1842
{
1843
	struct path cur = *path;
1844
	__be32 *p;
T
Trond Myklebust 已提交
1845 1846 1847
	struct dentry **components = NULL;
	unsigned int ncomponents = 0;
	__be32 err = nfserr_jukebox;
1848

T
Trond Myklebust 已提交
1849
	dprintk("nfsd4_encode_components(");
1850

T
Trond Myklebust 已提交
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
	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);
	}
1875 1876 1877
	err = nfserr_resource;
	p = xdr_reserve_space(xdr, 4);
	if (!p)
T
Trond Myklebust 已提交
1878 1879 1880 1881 1882
		goto out_free;
	WRITE32(ncomponents);

	while (ncomponents) {
		struct dentry *dentry = components[ncomponents - 1];
1883
		unsigned int len;
T
Trond Myklebust 已提交
1884

1885 1886
		spin_lock(&dentry->d_lock);
		len = dentry->d_name.len;
1887 1888
		p = xdr_reserve_space(xdr, len + 4);
		if (!p) {
1889
			spin_unlock(&dentry->d_lock);
T
Trond Myklebust 已提交
1890
			goto out_free;
1891
		}
T
Trond Myklebust 已提交
1892 1893 1894
		WRITE32(len);
		WRITEMEM(dentry->d_name.name, len);
		dprintk("/%s", dentry->d_name.name);
1895
		spin_unlock(&dentry->d_lock);
T
Trond Myklebust 已提交
1896 1897
		dput(dentry);
		ncomponents--;
1898
	}
T
Trond Myklebust 已提交
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909

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

1910 1911
static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
			struct svc_rqst *rqstp, const struct path *path)
T
Trond Myklebust 已提交
1912 1913 1914 1915 1916 1917 1918
{
	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));
1919
	res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
T
Trond Myklebust 已提交
1920 1921
	exp_put(exp_ps);
	return res;
1922 1923 1924 1925 1926
}

/*
 *  encode a fs_locations structure
 */
1927 1928
static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
			struct svc_rqst *rqstp, struct svc_export *exp)
1929
{
1930
	__be32 status;
1931
	int i;
1932
	__be32 *p;
1933 1934
	struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;

1935
	status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1936 1937
	if (status)
		return status;
1938 1939
	p = xdr_reserve_space(xdr, 4);
	if (!p)
1940 1941 1942
		return nfserr_resource;
	WRITE32(fslocs->locations_count);
	for (i=0; i<fslocs->locations_count; i++) {
1943
		status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1944 1945 1946 1947 1948
		if (status)
			return status;
	}
	return 0;
}
L
Linus Torvalds 已提交
1949

1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962
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
1963

1964
static inline __be32
1965 1966
nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
		     struct nfs4_ace *ace)
L
Linus Torvalds 已提交
1967
{
1968
	if (ace->whotype != NFS4_ACL_WHO_NAMED)
1969
		return nfs4_acl_write_who(xdr, ace->whotype);
1970
	else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1971
		return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1972
	else
1973
		return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
L
Linus Torvalds 已提交
1974 1975
}

1976 1977 1978 1979
#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

1980 1981
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
static inline __be32
1982 1983
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
			    void *context, int len)
1984
{
1985
	__be32 *p;
1986

1987 1988
	p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
	if (!p)
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
		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
2002 2003
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
			    void *context, int len)
2004 2005 2006
{ return 0; }
#endif

2007
static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
{
	/* 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
2022

2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033

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
2034
	err = vfs_getattr(&path, stat);
2035 2036 2037 2038
	path_put(&path);
	return err;
}

L
Linus Torvalds 已提交
2039 2040 2041 2042
/*
 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
 * ourselves.
 */
2043
__be32
2044 2045 2046
nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
		struct svc_export *exp,
		struct dentry *dentry, u32 *bmval,
2047
		struct svc_rqst *rqstp, int ignore_crossmnt)
L
Linus Torvalds 已提交
2048 2049 2050
{
	u32 bmval0 = bmval[0];
	u32 bmval1 = bmval[1];
2051
	u32 bmval2 = bmval[2];
L
Linus Torvalds 已提交
2052
	struct kstat stat;
2053
	struct svc_fh *tempfh = NULL;
L
Linus Torvalds 已提交
2054
	struct kstatfs statfs;
2055 2056
	__be32 *p;
	__be32 *start = xdr->p;
A
Al Viro 已提交
2057
	__be32 *attrlenp;
L
Linus Torvalds 已提交
2058 2059
	u32 dummy;
	u64 dummy64;
2060
	u32 rdattr_err = 0;
2061
	__be32 status;
2062
	int err;
L
Linus Torvalds 已提交
2063 2064
	int aclsupport = 0;
	struct nfs4_acl *acl = NULL;
2065 2066 2067
	void *context = NULL;
	int contextlen;
	bool contextsupport = false;
2068 2069
	struct nfsd4_compoundres *resp = rqstp->rq_resp;
	u32 minorversion = resp->cstate.minorversion;
2070 2071 2072 2073
	struct path path = {
		.mnt	= exp->ex_path.mnt,
		.dentry	= dentry,
	};
2074
	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
L
Linus Torvalds 已提交
2075 2076

	BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2077 2078 2079
	BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
	BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
	BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
L
Linus Torvalds 已提交
2080

2081
	if (exp->ex_fslocs.migrated) {
2082
		BUG_ON(bmval[2]);
2083 2084 2085 2086 2087
		status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
		if (status)
			goto out;
	}

A
Al Viro 已提交
2088
	err = vfs_getattr(&path, &stat);
2089
	if (err)
L
Linus Torvalds 已提交
2090
		goto out_nfserr;
2091 2092
	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
			FATTR4_WORD0_MAXNAME)) ||
L
Linus Torvalds 已提交
2093 2094
	    (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
		       FATTR4_WORD1_SPACE_TOTAL))) {
2095
		err = vfs_statfs(&path, &statfs);
2096
		if (err)
L
Linus Torvalds 已提交
2097 2098 2099
			goto out_nfserr;
	}
	if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2100 2101 2102 2103 2104 2105
		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
2106 2107
		if (status)
			goto out;
2108
		fhp = tempfh;
L
Linus Torvalds 已提交
2109 2110 2111
	}
	if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
			| FATTR4_WORD0_SUPPORTED_ATTRS)) {
2112 2113
		err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
		aclsupport = (err == 0);
L
Linus Torvalds 已提交
2114
		if (bmval0 & FATTR4_WORD0_ACL) {
2115
			if (err == -EOPNOTSUPP)
L
Linus Torvalds 已提交
2116
				bmval0 &= ~FATTR4_WORD0_ACL;
2117
			else if (err == -EINVAL) {
L
Linus Torvalds 已提交
2118 2119
				status = nfserr_attrnotsupp;
				goto out;
2120
			} else if (err != 0)
L
Linus Torvalds 已提交
2121 2122 2123 2124
				goto out_nfserr;
		}
	}

2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139
#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 */

2140
	if (bmval2) {
2141 2142
		p = xdr_reserve_space(xdr, 16);
		if (!p)
2143
			goto out_resource;
2144 2145 2146 2147
		WRITE32(3);
		WRITE32(bmval0);
		WRITE32(bmval1);
		WRITE32(bmval2);
2148
	} else if (bmval1) {
2149 2150
		p = xdr_reserve_space(xdr, 12);
		if (!p)
2151
			goto out_resource;
2152 2153 2154 2155
		WRITE32(2);
		WRITE32(bmval0);
		WRITE32(bmval1);
	} else {
2156 2157
		p = xdr_reserve_space(xdr, 8);
		if (!p)
2158
			goto out_resource;
2159 2160 2161
		WRITE32(1);
		WRITE32(bmval0);
	}
2162 2163 2164
	p = xdr_reserve_space(xdr, 4);
	if (!p)
		goto out_resource;
L
Linus Torvalds 已提交
2165 2166 2167
	attrlenp = p++;                /* to be backfilled later */

	if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2168 2169 2170 2171
		u32 word0 = nfsd_suppattrs0(minorversion);
		u32 word1 = nfsd_suppattrs1(minorversion);
		u32 word2 = nfsd_suppattrs2(minorversion);

2172 2173
		if (!aclsupport)
			word0 &= ~FATTR4_WORD0_ACL;
2174 2175
		if (!contextsupport)
			word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2176
		if (!word2) {
2177 2178
			p = xdr_reserve_space(xdr, 12);
			if (!p)
2179
				goto out_resource;
2180 2181 2182 2183
			WRITE32(2);
			WRITE32(word0);
			WRITE32(word1);
		} else {
2184 2185
			p = xdr_reserve_space(xdr, 16);
			if (!p)
2186
				goto out_resource;
2187 2188 2189 2190 2191
			WRITE32(3);
			WRITE32(word0);
			WRITE32(word1);
			WRITE32(word2);
		}
L
Linus Torvalds 已提交
2192 2193
	}
	if (bmval0 & FATTR4_WORD0_TYPE) {
2194 2195
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2196
			goto out_resource;
2197
		dummy = nfs4_file_type(stat.mode);
2198 2199 2200 2201
		if (dummy == NF4BAD) {
			status = nfserr_serverfault;
			goto out;
		}
L
Linus Torvalds 已提交
2202 2203 2204
		WRITE32(dummy);
	}
	if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2205 2206
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2207
			goto out_resource;
N
NeilBrown 已提交
2208
		if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
N
NeilBrown 已提交
2209
			WRITE32(NFS4_FH_PERSISTENT);
N
NeilBrown 已提交
2210
		else
N
NeilBrown 已提交
2211
			WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
L
Linus Torvalds 已提交
2212 2213
	}
	if (bmval0 & FATTR4_WORD0_CHANGE) {
2214 2215
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2216
			goto out_resource;
J
J. Bruce Fields 已提交
2217
		write_change(&p, &stat, dentry->d_inode);
L
Linus Torvalds 已提交
2218 2219
	}
	if (bmval0 & FATTR4_WORD0_SIZE) {
2220 2221
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2222 2223 2224 2225
			goto out_resource;
		WRITE64(stat.size);
	}
	if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2226 2227
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2228 2229 2230 2231
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2232 2233
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2234 2235 2236 2237
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2238 2239
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2240 2241 2242 2243
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_FSID) {
2244 2245
		p = xdr_reserve_space(xdr, 16);
		if (!p)
L
Linus Torvalds 已提交
2246
			goto out_resource;
2247 2248 2249
		if (exp->ex_fslocs.migrated) {
			WRITE64(NFS4_REFERRAL_FSID_MAJOR);
			WRITE64(NFS4_REFERRAL_FSID_MINOR);
2250 2251
		} else switch(fsid_source(fhp)) {
		case FSIDSOURCE_FSID:
L
Linus Torvalds 已提交
2252 2253
			WRITE64((u64)exp->ex_fsid);
			WRITE64((u64)0);
2254 2255
			break;
		case FSIDSOURCE_DEV:
L
Linus Torvalds 已提交
2256 2257 2258 2259
			WRITE32(0);
			WRITE32(MAJOR(stat.dev));
			WRITE32(0);
			WRITE32(MINOR(stat.dev));
2260 2261 2262 2263
			break;
		case FSIDSOURCE_UUID:
			WRITEMEM(exp->ex_uuid, 16);
			break;
L
Linus Torvalds 已提交
2264 2265 2266
		}
	}
	if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2267 2268
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2269 2270 2271 2272
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2273 2274
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2275
			goto out_resource;
2276
		WRITE32(nn->nfsd4_lease);
L
Linus Torvalds 已提交
2277 2278
	}
	if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2279 2280
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2281
			goto out_resource;
2282
		WRITE32(rdattr_err);
L
Linus Torvalds 已提交
2283 2284 2285 2286 2287
	}
	if (bmval0 & FATTR4_WORD0_ACL) {
		struct nfs4_ace *ace;

		if (acl == NULL) {
2288 2289
			p = xdr_reserve_space(xdr, 4);
			if (!p)
L
Linus Torvalds 已提交
2290 2291 2292 2293 2294
				goto out_resource;

			WRITE32(0);
			goto out_acl;
		}
2295 2296
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2297 2298 2299
			goto out_resource;
		WRITE32(acl->naces);

2300
		for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2301 2302
			p = xdr_reserve_space(xdr, 4*3);
			if (!p)
L
Linus Torvalds 已提交
2303 2304 2305 2306
				goto out_resource;
			WRITE32(ace->type);
			WRITE32(ace->flag);
			WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2307
			status = nfsd4_encode_aclname(xdr, rqstp, ace);
L
Linus Torvalds 已提交
2308 2309 2310 2311 2312 2313
			if (status)
				goto out;
		}
	}
out_acl:
	if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2314 2315
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2316 2317 2318 2319 2320
			goto out_resource;
		WRITE32(aclsupport ?
			ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
	}
	if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2321 2322
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2323 2324 2325 2326
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2327 2328
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2329
			goto out_resource;
2330
		WRITE32(0);
L
Linus Torvalds 已提交
2331 2332
	}
	if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2333 2334
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2335 2336 2337 2338
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2339 2340
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2341 2342 2343 2344
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2345 2346
		p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
		if (!p)
L
Linus Torvalds 已提交
2347 2348 2349 2350 2351
			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) {
2352 2353
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2354
			goto out_resource;
2355
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
2356 2357
	}
	if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2358 2359
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2360 2361 2362 2363
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2364 2365
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2366 2367 2368 2369
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2370 2371
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2372 2373 2374
			goto out_resource;
		WRITE64((u64) statfs.f_files);
	}
2375
	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2376
		status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2377 2378 2379
		if (status)
			goto out;
	}
L
Linus Torvalds 已提交
2380
	if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2381 2382
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2383 2384 2385 2386
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2387 2388
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2389
			goto out_resource;
2390
		WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
L
Linus Torvalds 已提交
2391 2392
	}
	if (bmval0 & FATTR4_WORD0_MAXLINK) {
2393 2394
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2395 2396 2397 2398
			goto out_resource;
		WRITE32(255);
	}
	if (bmval0 & FATTR4_WORD0_MAXNAME) {
2399 2400
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2401
			goto out_resource;
2402
		WRITE32(statfs.f_namelen);
L
Linus Torvalds 已提交
2403 2404
	}
	if (bmval0 & FATTR4_WORD0_MAXREAD) {
2405 2406
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2407
			goto out_resource;
2408
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
2409 2410
	}
	if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2411 2412
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2413
			goto out_resource;
2414
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
2415 2416
	}
	if (bmval1 & FATTR4_WORD1_MODE) {
2417 2418
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2419 2420 2421 2422
			goto out_resource;
		WRITE32(stat.mode & S_IALLUGO);
	}
	if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2423 2424
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2425 2426 2427 2428
			goto out_resource;
		WRITE32(1);
	}
	if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2429 2430
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2431 2432 2433 2434
			goto out_resource;
		WRITE32(stat.nlink);
	}
	if (bmval1 & FATTR4_WORD1_OWNER) {
2435
		status = nfsd4_encode_user(xdr, rqstp, stat.uid);
L
Linus Torvalds 已提交
2436 2437 2438 2439
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2440
		status = nfsd4_encode_group(xdr, rqstp, stat.gid);
L
Linus Torvalds 已提交
2441 2442 2443 2444
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_RAWDEV) {
2445 2446
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2447 2448 2449 2450 2451
			goto out_resource;
		WRITE32((u32) MAJOR(stat.rdev));
		WRITE32((u32) MINOR(stat.rdev));
	}
	if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2452 2453
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2454 2455 2456 2457 2458
			goto out_resource;
		dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2459 2460
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2461 2462 2463 2464 2465
			goto out_resource;
		dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2466 2467
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2468 2469 2470 2471 2472
			goto out_resource;
		dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2473 2474
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2475 2476 2477 2478 2479
			goto out_resource;
		dummy64 = (u64)stat.blocks << 9;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2480 2481
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2482
			goto out_resource;
2483
		WRITE64((s64)stat.atime.tv_sec);
L
Linus Torvalds 已提交
2484 2485 2486
		WRITE32(stat.atime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2487 2488
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2489 2490 2491 2492 2493 2494
			goto out_resource;
		WRITE32(0);
		WRITE32(1);
		WRITE32(0);
	}
	if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2495 2496
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2497
			goto out_resource;
2498
		WRITE64((s64)stat.ctime.tv_sec);
L
Linus Torvalds 已提交
2499 2500 2501
		WRITE32(stat.ctime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2502 2503
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2504
			goto out_resource;
2505
		WRITE64((s64)stat.mtime.tv_sec);
L
Linus Torvalds 已提交
2506 2507 2508
		WRITE32(stat.mtime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2509 2510
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2511
                	goto out_resource;
2512 2513 2514 2515 2516
		/*
		 * Get parent's attributes if not ignoring crossmount
		 * and this is the root of a cross-mounted filesystem.
		 */
		if (ignore_crossmnt == 0 &&
2517 2518
		    dentry == exp->ex_path.mnt->mnt_root)
			get_parent_attributes(exp, &stat);
2519
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
2520
	}
2521
	if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2522 2523
		status = nfsd4_encode_security_label(xdr, rqstp, context,
								contextlen);
2524 2525 2526
		if (status)
			goto out;
	}
2527
	if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2528 2529
		p = xdr_reserve_space(xdr, 16);
		if (!p)
2530
			goto out_resource;
2531 2532 2533 2534 2535
		WRITE32(3);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
	}
2536

2537
	*attrlenp = htonl((char *)xdr->p - (char *)attrlenp - 4);
L
Linus Torvalds 已提交
2538 2539 2540
	status = nfs_ok;

out:
2541
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2542 2543
	if (context)
		security_release_secctx(context, contextlen);
2544
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2545
	kfree(acl);
2546
	if (tempfh) {
2547
		fh_put(tempfh);
2548 2549
		kfree(tempfh);
	}
2550 2551 2552 2553 2554 2555 2556
	if (status) {
		int nbytes = (char *)xdr->p - (char *)start;
		/* open code what *should* be xdr_truncate(xdr, len); */
		xdr->iov->iov_len -= nbytes;
		xdr->buf->len -= nbytes;
		xdr->p = start;
	}
L
Linus Torvalds 已提交
2557 2558
	return status;
out_nfserr:
2559
	status = nfserrno(err);
L
Linus Torvalds 已提交
2560 2561 2562 2563 2564 2565
	goto out;
out_resource:
	status = nfserr_resource;
	goto out;
}

2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586
__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)
{
	struct xdr_buf dummy = {
			.head[0] = {
				.iov_base = *p,
			},
			.buflen = words << 2,
		};
	struct xdr_stream xdr;
	__be32 ret;

	xdr_init_encode(&xdr, &dummy, NULL);
	ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
							ignore_crossmnt);
	*p = xdr.p;
	return ret;
}

2587 2588 2589 2590 2591 2592 2593 2594 2595
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;
}

2596
static __be32
L
Linus Torvalds 已提交
2597
nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2598
		const char *name, int namlen, __be32 **p, int buflen)
L
Linus Torvalds 已提交
2599 2600 2601
{
	struct svc_export *exp = cd->rd_fhp->fh_export;
	struct dentry *dentry;
2602
	__be32 nfserr;
2603
	int ignore_crossmnt = 0;
L
Linus Torvalds 已提交
2604 2605 2606 2607

	dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
	if (IS_ERR(dentry))
		return nfserrno(PTR_ERR(dentry));
2608 2609 2610 2611 2612 2613 2614 2615 2616
	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
2617 2618

	exp_get(exp);
2619 2620 2621 2622 2623 2624 2625
	/*
	 * 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.
	 */
2626
	if (nfsd_mountpoint(dentry, exp)) {
2627 2628
		int err;

2629 2630 2631 2632 2633
		if (!(exp->ex_flags & NFSEXP_V4ROOT)
				&& !attributes_need_mount(cd->rd_bmval)) {
			ignore_crossmnt = 1;
			goto out_encode;
		}
A
Andy Adamson 已提交
2634 2635 2636 2637 2638
		/*
		 * Why the heck aren't we just using nfsd_lookup??
		 * Different "."/".." handling?  Something else?
		 * At least, add a comment here to explain....
		 */
2639 2640 2641
		err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
		if (err) {
			nfserr = nfserrno(err);
L
Linus Torvalds 已提交
2642 2643
			goto out_put;
		}
A
Andy Adamson 已提交
2644 2645 2646
		nfserr = check_nfsd_access(exp, cd->rd_rqstp);
		if (nfserr)
			goto out_put;
L
Linus Torvalds 已提交
2647 2648

	}
2649
out_encode:
2650 2651
	nfserr = nfsd4_encode_fattr_to_buf(p, buflen, NULL, exp, dentry,
					cd->rd_bmval,
2652
					cd->rd_rqstp, ignore_crossmnt);
L
Linus Torvalds 已提交
2653 2654 2655 2656 2657 2658
out_put:
	dput(dentry);
	exp_put(exp);
	return nfserr;
}

A
Al Viro 已提交
2659
static __be32 *
2660
nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
L
Linus Torvalds 已提交
2661 2662 2663 2664 2665 2666 2667
{
	if (buflen < 6)
		return NULL;
	*p++ = htonl(2);
	*p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
	*p++ = htonl(0);			 /* bmval1 */

2668
	*p++ = htonl(4);     /* attribute length */
L
Linus Torvalds 已提交
2669 2670 2671 2672 2673
	*p++ = nfserr;       /* no htonl */
	return p;
}

static int
2674 2675
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
2676
{
2677
	struct readdir_cd *ccd = ccdv;
L
Linus Torvalds 已提交
2678 2679
	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
	int buflen;
A
Al Viro 已提交
2680
	__be32 *p = cd->buffer;
2681
	__be32 *cookiep;
2682
	__be32 nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697

	/* 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 */
2698
	cookiep = p;
L
Linus Torvalds 已提交
2699 2700 2701
	p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
	p = xdr_encode_array(p, name, namlen);      /* name length & name */

2702
	nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
L
Linus Torvalds 已提交
2703 2704 2705 2706 2707 2708
	switch (nfserr) {
	case nfs_ok:
		break;
	case nfserr_resource:
		nfserr = nfserr_toosmall;
		goto fail;
2709 2710
	case nfserr_noent:
		goto skip_entry;
L
Linus Torvalds 已提交
2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721
	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);
2722 2723
		if (p == NULL) {
			nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
2724
			goto fail;
2725
		}
L
Linus Torvalds 已提交
2726 2727 2728
	}
	cd->buflen -= (p - cd->buffer);
	cd->buffer = p;
2729 2730
	cd->offset = cookiep;
skip_entry:
L
Linus Torvalds 已提交
2731 2732 2733 2734 2735 2736 2737
	cd->common.err = nfs_ok;
	return 0;
fail:
	cd->common.err = nfserr;
	return -EINVAL;
}

2738 2739 2740
static void
nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
{
2741
	__be32 *p;
2742 2743 2744 2745 2746 2747

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

2748
static __be32
2749
nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
L
Linus Torvalds 已提交
2750
{
2751
	__be32 *p;
L
Linus Torvalds 已提交
2752 2753 2754 2755 2756 2757

	if (!nfserr) {
		RESERVE_SPACE(8);
		WRITE32(access->ac_supported);
		WRITE32(access->ac_resp_access);
	}
2758
	return nfserr;
L
Linus Torvalds 已提交
2759 2760
}

2761 2762 2763 2764 2765 2766 2767 2768
static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
{
	__be32 *p;

	if (!nfserr) {
		RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
		WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
		WRITE32(bcts->dir);
2769
		/* Sorry, we do not yet support RDMA over 4.1: */
2770 2771 2772 2773 2774
		WRITE32(0);
	}
	return nfserr;
}

2775
static __be32
2776
nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
L
Linus Torvalds 已提交
2777
{
2778 2779 2780
	if (!nfserr)
		nfsd4_encode_stateid(resp, &close->cl_stateid);

2781
	return nfserr;
L
Linus Torvalds 已提交
2782 2783 2784
}


2785
static __be32
2786
nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
L
Linus Torvalds 已提交
2787
{
2788
	__be32 *p;
L
Linus Torvalds 已提交
2789 2790

	if (!nfserr) {
2791 2792
		RESERVE_SPACE(NFS4_VERIFIER_SIZE);
		WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
2793
	}
2794
	return nfserr;
L
Linus Torvalds 已提交
2795 2796
}

2797
static __be32
2798
nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
L
Linus Torvalds 已提交
2799
{
2800
	__be32 *p;
L
Linus Torvalds 已提交
2801 2802 2803

	if (!nfserr) {
		RESERVE_SPACE(32);
J
J. Bruce Fields 已提交
2804
		write_cinfo(&p, &create->cr_cinfo);
L
Linus Torvalds 已提交
2805 2806 2807 2808
		WRITE32(2);
		WRITE32(create->cr_bmval[0]);
		WRITE32(create->cr_bmval[1]);
	}
2809
	return nfserr;
L
Linus Torvalds 已提交
2810 2811
}

2812 2813
static __be32
nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
L
Linus Torvalds 已提交
2814 2815
{
	struct svc_fh *fhp = getattr->ga_fhp;
2816
	struct xdr_stream *xdr = &resp->xdr;
L
Linus Torvalds 已提交
2817 2818 2819 2820

	if (nfserr)
		return nfserr;

2821 2822
	nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
				    getattr->ga_bmval,
2823
				    resp->rqstp, 0);
L
Linus Torvalds 已提交
2824 2825 2826
	return nfserr;
}

2827 2828
static __be32
nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
L
Linus Torvalds 已提交
2829
{
2830
	struct svc_fh *fhp = *fhpp;
L
Linus Torvalds 已提交
2831
	unsigned int len;
2832
	__be32 *p;
L
Linus Torvalds 已提交
2833 2834 2835 2836 2837 2838 2839

	if (!nfserr) {
		len = fhp->fh_handle.fh_size;
		RESERVE_SPACE(len + 4);
		WRITE32(len);
		WRITEMEM(&fhp->fh_handle.fh_base, len);
	}
2840
	return nfserr;
L
Linus Torvalds 已提交
2841 2842 2843 2844 2845 2846 2847 2848 2849
}

/*
* Including all fields other than the name, a LOCK4denied structure requires
*   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
*/
static void
nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
{
2850
	struct xdr_netobj *conf = &ld->ld_owner;
2851
	__be32 *p;
L
Linus Torvalds 已提交
2852

2853
	RESERVE_SPACE(32 + XDR_LEN(conf->len));
L
Linus Torvalds 已提交
2854 2855 2856
	WRITE64(ld->ld_start);
	WRITE64(ld->ld_length);
	WRITE32(ld->ld_type);
2857
	if (conf->len) {
L
Linus Torvalds 已提交
2858
		WRITEMEM(&ld->ld_clientid, 8);
2859 2860 2861
		WRITE32(conf->len);
		WRITEMEM(conf->data, conf->len);
		kfree(conf->data);
L
Linus Torvalds 已提交
2862 2863 2864 2865 2866 2867
	}  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
		WRITE64((u64)0); /* clientid */
		WRITE32(0); /* length of owner name */
	}
}

2868
static __be32
2869
nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
L
Linus Torvalds 已提交
2870
{
2871 2872 2873
	if (!nfserr)
		nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
	else if (nfserr == nfserr_denied)
L
Linus Torvalds 已提交
2874 2875
		nfsd4_encode_lock_denied(resp, &lock->lk_denied);

2876
	return nfserr;
L
Linus Torvalds 已提交
2877 2878
}

2879
static __be32
2880
nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
L
Linus Torvalds 已提交
2881 2882 2883
{
	if (nfserr == nfserr_denied)
		nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2884
	return nfserr;
L
Linus Torvalds 已提交
2885 2886
}

2887
static __be32
2888
nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
L
Linus Torvalds 已提交
2889
{
2890 2891 2892
	if (!nfserr)
		nfsd4_encode_stateid(resp, &locku->lu_stateid);

2893
	return nfserr;
L
Linus Torvalds 已提交
2894 2895 2896
}


2897
static __be32
2898
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
L
Linus Torvalds 已提交
2899
{
2900
	__be32 *p;
L
Linus Torvalds 已提交
2901 2902 2903

	if (!nfserr) {
		RESERVE_SPACE(20);
J
J. Bruce Fields 已提交
2904
		write_cinfo(&p, &link->li_cinfo);
L
Linus Torvalds 已提交
2905
	}
2906
	return nfserr;
L
Linus Torvalds 已提交
2907 2908 2909
}


2910
static __be32
2911
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
L
Linus Torvalds 已提交
2912
{
2913
	__be32 *p;
L
Linus Torvalds 已提交
2914 2915 2916 2917

	if (nfserr)
		goto out;

2918 2919
	nfsd4_encode_stateid(resp, &open->op_stateid);
	RESERVE_SPACE(40);
J
J. Bruce Fields 已提交
2920
	write_cinfo(&p, &open->op_cinfo);
L
Linus Torvalds 已提交
2921 2922 2923 2924 2925 2926 2927 2928 2929 2930
	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:
2931 2932
		nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
		RESERVE_SPACE(20);
2933
		WRITE32(open->op_recall);
L
Linus Torvalds 已提交
2934 2935 2936 2937 2938 2939 2940 2941 2942 2943

		/*
		 * 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:
2944 2945
		nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
		RESERVE_SPACE(32);
L
Linus Torvalds 已提交
2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962
		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;
2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975
	case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
		switch (open->op_why_no_deleg) {
		case WND4_CONTENTION:
		case WND4_RESOURCE:
			RESERVE_SPACE(8);
			WRITE32(open->op_why_no_deleg);
			WRITE32(0);	/* deleg signaling not supported yet */
			break;
		default:
			RESERVE_SPACE(4);
			WRITE32(open->op_why_no_deleg);
		}
		break;
L
Linus Torvalds 已提交
2976 2977 2978 2979 2980
	default:
		BUG();
	}
	/* XXX save filehandle here */
out:
2981
	return nfserr;
L
Linus Torvalds 已提交
2982 2983
}

2984
static __be32
2985
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
L
Linus Torvalds 已提交
2986
{
2987 2988
	if (!nfserr)
		nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
L
Linus Torvalds 已提交
2989

2990
	return nfserr;
L
Linus Torvalds 已提交
2991 2992
}

2993
static __be32
2994
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
L
Linus Torvalds 已提交
2995
{
2996 2997
	if (!nfserr)
		nfsd4_encode_stateid(resp, &od->od_stateid);
L
Linus Torvalds 已提交
2998

2999
	return nfserr;
L
Linus Torvalds 已提交
3000 3001
}

3002 3003
static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3004
		  struct nfsd4_read *read)
L
Linus Torvalds 已提交
3005 3006
{
	u32 eof;
3007 3008
	int v;
	struct page *page;
L
Linus Torvalds 已提交
3009
	unsigned long maxcount; 
3010
	struct xdr_stream *xdr = &resp->xdr;
L
Linus Torvalds 已提交
3011
	long len;
3012
	__be32 *p;
L
Linus Torvalds 已提交
3013 3014 3015

	if (nfserr)
		return nfserr;
3016
	if (resp->xdr.buf->page_len)
L
Linus Torvalds 已提交
3017 3018 3019 3020
		return nfserr_resource;

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

3021
	maxcount = svc_max_payload(resp->rqstp);
L
Linus Torvalds 已提交
3022 3023 3024 3025 3026 3027
	if (maxcount > read->rd_length)
		maxcount = read->rd_length;

	len = maxcount;
	v = 0;
	while (len > 0) {
3028 3029
		page = *(resp->rqstp->rq_next_page);
		if (!page) { /* ran out of pages */
3030 3031 3032
			maxcount -= len;
			break;
		}
3033
		resp->rqstp->rq_vec[v].iov_base = page_address(page);
3034
		resp->rqstp->rq_vec[v].iov_len =
3035
			len < PAGE_SIZE ? len : PAGE_SIZE;
3036
		resp->rqstp->rq_next_page++;
L
Linus Torvalds 已提交
3037 3038 3039 3040 3041
		v++;
		len -= PAGE_SIZE;
	}
	read->rd_vlen = v;

3042
	nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
3043
			read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
L
Linus Torvalds 已提交
3044 3045
			&maxcount);

3046 3047 3048
	if (nfserr) {
		xdr->p -= 2;
		xdr->iov->iov_len -= 8;
3049
		xdr->buf->len -= 8;
L
Linus Torvalds 已提交
3050
		return nfserr;
3051
	}
3052 3053
	eof = (read->rd_offset + maxcount >=
	       read->rd_fhp->fh_dentry->d_inode->i_size);
L
Linus Torvalds 已提交
3054 3055 3056

	WRITE32(eof);
	WRITE32(maxcount);
3057 3058
	WARN_ON_ONCE(resp->xdr.buf->head[0].iov_len != (char *)p
				- (char *)resp->xdr.buf->head[0].iov_base);
3059
	resp->xdr.buf->page_len = maxcount;
3060
	xdr->buf->len += maxcount;
3061
	xdr->iov = xdr->buf->tail;
L
Linus Torvalds 已提交
3062

3063
	/* Use rest of head for padding and remaining ops: */
3064 3065
	resp->xdr.buf->tail[0].iov_base = p;
	resp->xdr.buf->tail[0].iov_len = 0;
L
Linus Torvalds 已提交
3066
	if (maxcount&3) {
3067 3068
		RESERVE_SPACE(4);
		WRITE32(0);
3069 3070
		resp->xdr.buf->tail[0].iov_base += maxcount&3;
		resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
3071
		xdr->buf->len -= (maxcount&3);
L
Linus Torvalds 已提交
3072 3073 3074 3075
	}
	return 0;
}

3076 3077
static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
L
Linus Torvalds 已提交
3078 3079
{
	int maxcount;
3080
	struct xdr_stream *xdr = &resp->xdr;
L
Linus Torvalds 已提交
3081
	char *page;
3082
	__be32 *p;
L
Linus Torvalds 已提交
3083 3084 3085

	if (nfserr)
		return nfserr;
3086
	if (resp->xdr.buf->page_len)
L
Linus Torvalds 已提交
3087
		return nfserr_resource;
3088
	if (!*resp->rqstp->rq_next_page)
3089
		return nfserr_resource;
L
Linus Torvalds 已提交
3090

3091
	page = page_address(*(resp->rqstp->rq_next_page++));
L
Linus Torvalds 已提交
3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103

	maxcount = PAGE_SIZE;
	RESERVE_SPACE(4);

	/*
	 * XXX: By default, the ->readlink() VFS op will truncate symlinks
	 * if they would overflow the buffer.  Is this kosher in NFSv4?  If
	 * not, one easy fix is: if ->readlink() precisely fills the buffer,
	 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
	 */
	nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
	if (nfserr == nfserr_isdir)
3104 3105 3106 3107
		nfserr = nfserr_inval;
	if (nfserr) {
		xdr->p--;
		xdr->iov->iov_len -= 4;
3108
		xdr->buf->len -= 4;
L
Linus Torvalds 已提交
3109
		return nfserr;
3110
	}
L
Linus Torvalds 已提交
3111 3112

	WRITE32(maxcount);
3113 3114 3115
	resp->xdr.buf->head[0].iov_len = (char *)p
				- (char *)resp->xdr.buf->head[0].iov_base;
	resp->xdr.buf->page_len = maxcount;
3116
	xdr->buf->len += maxcount;
3117
	xdr->iov = xdr->buf->tail;
L
Linus Torvalds 已提交
3118

3119
	/* Use rest of head for padding and remaining ops: */
3120 3121
	resp->xdr.buf->tail[0].iov_base = p;
	resp->xdr.buf->tail[0].iov_len = 0;
L
Linus Torvalds 已提交
3122
	if (maxcount&3) {
3123 3124
		RESERVE_SPACE(4);
		WRITE32(0);
3125 3126
		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
3127 3128 3129 3130
	}
	return 0;
}

3131 3132
static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
L
Linus Torvalds 已提交
3133 3134 3135
{
	int maxcount;
	loff_t offset;
3136
	struct xdr_stream *xdr = &resp->xdr;
A
Al Viro 已提交
3137
	__be32 *page, *savep, *tailbase;
3138
	__be32 *p;
L
Linus Torvalds 已提交
3139 3140 3141

	if (nfserr)
		return nfserr;
3142
	if (resp->xdr.buf->page_len)
L
Linus Torvalds 已提交
3143
		return nfserr_resource;
3144
	if (!*resp->rqstp->rq_next_page)
3145
		return nfserr_resource;
L
Linus Torvalds 已提交
3146

3147
	RESERVE_SPACE(NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3148 3149 3150 3151 3152
	savep = p;

	/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
	WRITE32(0);
	WRITE32(0);
3153 3154
	resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
				- (char *)resp->xdr.buf->head[0].iov_base;
3155
	tailbase = p;
L
Linus Torvalds 已提交
3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171

	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;
	}

3172
	page = page_address(*(resp->rqstp->rq_next_page++));
L
Linus Torvalds 已提交
3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194
	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);
3195
	resp->xdr.buf->page_len = ((char *)p) -
3196
		(char*)page_address(*(resp->rqstp->rq_next_page-1));
3197
	xdr->buf->len += xdr->buf->page_len;
L
Linus Torvalds 已提交
3198

3199 3200
	xdr->iov = xdr->buf->tail;

3201
	/* Use rest of head for padding and remaining ops: */
3202 3203 3204 3205 3206
	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
3207 3208 3209

	return 0;
err_no_verf:
3210 3211 3212
	xdr->p = savep;
	xdr->iov->iov_len = ((char *)resp->xdr.p)
				- (char *)resp->xdr.buf->head[0].iov_base;
3213
	xdr->buf->len = xdr->iov->iov_len;
L
Linus Torvalds 已提交
3214 3215 3216
	return nfserr;
}

3217
static __be32
3218
nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
L
Linus Torvalds 已提交
3219
{
3220
	__be32 *p;
L
Linus Torvalds 已提交
3221 3222 3223

	if (!nfserr) {
		RESERVE_SPACE(20);
J
J. Bruce Fields 已提交
3224
		write_cinfo(&p, &remove->rm_cinfo);
L
Linus Torvalds 已提交
3225
	}
3226
	return nfserr;
L
Linus Torvalds 已提交
3227 3228
}

3229
static __be32
3230
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
L
Linus Torvalds 已提交
3231
{
3232
	__be32 *p;
L
Linus Torvalds 已提交
3233 3234 3235

	if (!nfserr) {
		RESERVE_SPACE(40);
J
J. Bruce Fields 已提交
3236 3237
		write_cinfo(&p, &rename->rn_sinfo);
		write_cinfo(&p, &rename->rn_tinfo);
L
Linus Torvalds 已提交
3238
	}
3239
	return nfserr;
L
Linus Torvalds 已提交
3240 3241
}

3242
static __be32
3243
nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3244
			 __be32 nfserr, struct svc_export *exp)
A
Andy Adamson 已提交
3245
{
3246
	u32 i, nflavs, supported;
3247 3248
	struct exp_flavor_info *flavs;
	struct exp_flavor_info def_flavs[2];
3249 3250
	__be32 *p, *flavorsp;
	static bool report = true;
A
Andy Adamson 已提交
3251 3252 3253

	if (nfserr)
		goto out;
3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273
	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;
		}
	}

3274
	supported = 0;
A
Andy Adamson 已提交
3275
	RESERVE_SPACE(4);
3276 3277
	flavorsp = p++;		/* to be backfilled later */

3278
	for (i = 0; i < nflavs; i++) {
3279
		rpc_authflavor_t pf = flavs[i].pseudoflavor;
3280
		struct rpcsec_gss_info info;
A
Andy Adamson 已提交
3281

3282 3283
		if (rpcauth_get_gssinfo(pf, &info) == 0) {
			supported++;
3284
			RESERVE_SPACE(4 + 4 + XDR_LEN(info.oid.len) + 4 + 4);
A
Andy Adamson 已提交
3285
			WRITE32(RPC_AUTH_GSS);
3286 3287 3288 3289
			WRITE32(info.oid.len);
			WRITEMEM(info.oid.data, info.oid.len);
			WRITE32(info.qop);
			WRITE32(info.service);
3290 3291
		} else if (pf < RPC_AUTH_MAXFLAVOR) {
			supported++;
A
Andy Adamson 已提交
3292
			RESERVE_SPACE(4);
3293 3294 3295 3296 3297
			WRITE32(pf);
		} else {
			if (report)
				pr_warn("NFS: SECINFO: security flavor %u "
					"is not supported\n", pf);
A
Andy Adamson 已提交
3298 3299
		}
	}
3300

3301 3302 3303 3304
	if (nflavs != supported)
		report = false;
	*flavorsp = htonl(supported);

A
Andy Adamson 已提交
3305 3306 3307
out:
	if (exp)
		exp_put(exp);
3308
	return nfserr;
A
Andy Adamson 已提交
3309 3310
}

3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324
static __be32
nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
		     struct nfsd4_secinfo *secinfo)
{
	return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
}

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

L
Linus Torvalds 已提交
3325 3326 3327 3328
/*
 * The SETATTR encode routine is special -- it always encodes a bitmap,
 * regardless of the error status.
 */
3329
static __be32
3330
nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
L
Linus Torvalds 已提交
3331
{
3332
	__be32 *p;
L
Linus Torvalds 已提交
3333

3334
	RESERVE_SPACE(16);
L
Linus Torvalds 已提交
3335
	if (nfserr) {
3336 3337
		WRITE32(3);
		WRITE32(0);
L
Linus Torvalds 已提交
3338 3339 3340 3341
		WRITE32(0);
		WRITE32(0);
	}
	else {
3342
		WRITE32(3);
L
Linus Torvalds 已提交
3343 3344
		WRITE32(setattr->sa_bmval[0]);
		WRITE32(setattr->sa_bmval[1]);
3345
		WRITE32(setattr->sa_bmval[2]);
L
Linus Torvalds 已提交
3346
	}
3347
	return nfserr;
L
Linus Torvalds 已提交
3348 3349
}

3350
static __be32
3351
nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
L
Linus Torvalds 已提交
3352
{
3353
	__be32 *p;
L
Linus Torvalds 已提交
3354 3355

	if (!nfserr) {
3356
		RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3357
		WRITEMEM(&scd->se_clientid, 8);
3358
		WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3359 3360 3361 3362 3363 3364
	}
	else if (nfserr == nfserr_clid_inuse) {
		RESERVE_SPACE(8);
		WRITE32(0);
		WRITE32(0);
	}
3365
	return nfserr;
L
Linus Torvalds 已提交
3366 3367
}

3368
static __be32
3369
nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
L
Linus Torvalds 已提交
3370
{
3371
	__be32 *p;
L
Linus Torvalds 已提交
3372 3373 3374 3375 3376

	if (!nfserr) {
		RESERVE_SPACE(16);
		WRITE32(write->wr_bytes_written);
		WRITE32(write->wr_how_written);
3377
		WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3378
	}
3379
	return nfserr;
L
Linus Torvalds 已提交
3380 3381
}

3382 3383 3384 3385 3386 3387 3388 3389
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
3390
static __be32
J
J. Bruce Fields 已提交
3391
nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3392 3393
			 struct nfsd4_exchange_id *exid)
{
3394
	__be32 *p;
A
Andy Adamson 已提交
3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412
	char *major_id;
	char *server_scope;
	int major_id_sz;
	int server_scope_sz;
	uint64_t minor_id = 0;

	if (nfserr)
		return nfserr;

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

	RESERVE_SPACE(
		8 /* eir_clientid */ +
		4 /* eir_sequenceid */ +
		4 /* eir_flags */ +
3413
		4 /* spr_how */);
A
Andy Adamson 已提交
3414 3415 3416 3417 3418 3419

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

	WRITE32(exid->spa_how);
3420

3421 3422 3423 3424
	switch (exid->spa_how) {
	case SP4_NONE:
		break;
	case SP4_MACH_CRED:
3425 3426 3427
		/* spo_must_enforce, spo_must_allow */
		RESERVE_SPACE(16);

3428 3429 3430 3431 3432 3433
		/* 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);
3434

3435 3436 3437 3438
		break;
	default:
		WARN_ON_ONCE(1);
	}
A
Andy Adamson 已提交
3439

3440 3441 3442 3443 3444 3445 3446 3447
	RESERVE_SPACE(
		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) */);

A
Andy Adamson 已提交
3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460
	/* 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
3461 3462 3463
}

static __be32
J
J. Bruce Fields 已提交
3464
nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3465 3466
			    struct nfsd4_create_session *sess)
{
3467
	__be32 *p;
A
Andy Adamson 已提交
3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504

	if (nfserr)
		return nfserr;

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

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

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

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

	if (sess->back_channel.nr_rdma_attrs) {
		RESERVE_SPACE(4);
		WRITE32(sess->back_channel.rdma_attrs);
	}
	return 0;
A
Andy Adamson 已提交
3505 3506
}

D
Daniel Mack 已提交
3507
static __be32
J
J. Bruce Fields 已提交
3508
nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3509 3510
		      struct nfsd4_sequence *seq)
{
3511
	__be32 *p;
B
Benny Halevy 已提交
3512 3513 3514 3515 3516 3517 3518 3519

	if (nfserr)
		return nfserr;

	RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
	WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
	WRITE32(seq->seqid);
	WRITE32(seq->slotid);
3520 3521 3522
	/* Note slotid's are numbered from zero: */
	WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
	WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3523
	WRITE32(seq->status_flags);
B
Benny Halevy 已提交
3524

3525
	resp->cstate.datap = p; /* DRC cache data pointer */
B
Benny Halevy 已提交
3526
	return 0;
A
Andy Adamson 已提交
3527 3528
}

J
J. Bruce Fields 已提交
3529
static __be32
J
J. Bruce Fields 已提交
3530
nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3531 3532
			  struct nfsd4_test_stateid *test_stateid)
{
3533
	struct nfsd4_test_stateid_id *stateid, *next;
3534 3535
	__be32 *p;

3536 3537 3538
	if (nfserr)
		return nfserr;

3539
	RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3540 3541
	*p++ = htonl(test_stateid->ts_num_ids);

3542
	list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3543
		*p++ = stateid->ts_id_status;
3544 3545 3546 3547 3548
	}

	return nfserr;
}

3549 3550 3551 3552 3553 3554 3555 3556
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
3557 3558 3559 3560 3561
/*
 * 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.
 */
3562
static nfsd4_enc nfsd4_enc_ops[] = {
3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578
	[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,
3579
	[OP_OPENATTR]		= (nfsd4_enc)nfsd4_encode_noop,
3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599
	[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
3600 3601 3602

	/* NFSv4.1 operations */
	[OP_BACKCHANNEL_CTL]	= (nfsd4_enc)nfsd4_encode_noop,
3603
	[OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
A
Andy Adamson 已提交
3604 3605
	[OP_EXCHANGE_ID]	= (nfsd4_enc)nfsd4_encode_exchange_id,
	[OP_CREATE_SESSION]	= (nfsd4_enc)nfsd4_encode_create_session,
3606 3607
	[OP_DESTROY_SESSION]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_FREE_STATEID]	= (nfsd4_enc)nfsd4_encode_noop,
A
Andy Adamson 已提交
3608 3609 3610 3611 3612 3613
	[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,
3614
	[OP_SECINFO_NO_NAME]	= (nfsd4_enc)nfsd4_encode_secinfo_no_name,
A
Andy Adamson 已提交
3615 3616
	[OP_SEQUENCE]		= (nfsd4_enc)nfsd4_encode_sequence,
	[OP_SET_SSV]		= (nfsd4_enc)nfsd4_encode_noop,
3617
	[OP_TEST_STATEID]	= (nfsd4_enc)nfsd4_encode_test_stateid,
A
Andy Adamson 已提交
3618 3619 3620
	[OP_WANT_DELEGATION]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_DESTROY_CLIENTID]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_RECLAIM_COMPLETE]	= (nfsd4_enc)nfsd4_encode_noop,
3621 3622
};

3623 3624
/*
 * Calculate the total amount of memory that the compound response has taken
3625
 * after encoding the current operation with pad.
3626
 *
3627 3628
 * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
 *      which was specified at nfsd4_operation, else pad is zero.
3629
 *
3630
 * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3631 3632 3633 3634
 *
 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
 * will be at least a page and will therefore hold the xdr_buf head.
 */
J
J. Bruce Fields 已提交
3635
__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3636 3637 3638 3639
{
	struct xdr_buf *xb = &resp->rqstp->rq_res;
	struct nfsd4_session *session = NULL;
	struct nfsd4_slot *slot = resp->cstate.slot;
3640
	u32 length, tlen = 0;
3641 3642

	if (!nfsd4_has_session(&resp->cstate))
3643
		return 0;
3644 3645 3646 3647

	session = resp->cstate.session;

	if (xb->page_len == 0) {
3648
		length = (char *)resp->xdr.p - (char *)xb->head[0].iov_base + pad;
3649 3650
	} else {
		if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3651
			tlen = (char *)resp->xdr.p - (char *)xb->tail[0].iov_base;
3652 3653 3654 3655 3656 3657

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

3658 3659 3660
	if (length > session->se_fchannel.maxresp_sz)
		return nfserr_rep_too_big;

3661
	if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3662
	    length > session->se_fchannel.maxresp_cached)
3663
		return nfserr_rep_too_big_to_cache;
3664 3665

	return 0;
3666 3667
}

L
Linus Torvalds 已提交
3668 3669 3670
void
nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
3671
	struct nfs4_stateowner *so = resp->cstate.replay_owner;
3672
	struct svc_rqst *rqstp = resp->rqstp;
A
Al Viro 已提交
3673
	__be32 *statp;
3674
	nfsd4_enc encoder;
3675
	__be32 *p;
L
Linus Torvalds 已提交
3676 3677 3678 3679 3680

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

3681 3682 3683 3684
	if (op->opnum == OP_ILLEGAL)
		goto status;
	BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
	       !nfsd4_enc_ops[op->opnum]);
3685 3686
	encoder = nfsd4_enc_ops[op->opnum];
	op->status = encoder(resp, op->status, &op->u);
3687
	/* nfsd4_check_resp_size guarantees enough room for error status */
3688 3689 3690 3691 3692 3693
	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);
	}
3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706
	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);
		resp->xdr.p = statp + 1;
	}
3707 3708
	if (so) {
		so->so_replay.rp_status = op->status;
3709 3710
		so->so_replay.rp_buflen = (char *)resp->xdr.p
						- (char *)(statp+1);
3711 3712
		memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
	}
3713
status:
L
Linus Torvalds 已提交
3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731
	/*
	 * Note: We write the status directly, instead of using WRITE32(),
	 * since it is already in network byte order.
	 */
	*statp = op->status;
}

/* 
 * Encode the reply stored in the stateowner reply cache 
 * 
 * XDR note: do not encode rp->rp_buflen: the buffer contains the
 * previously sent already encoded operation.
 *
 * called with nfs4_lock_state() held
 */
void
nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
3732
	__be32 *p;
L
Linus Torvalds 已提交
3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745
	struct nfs4_replay *rp = op->replay;

	BUG_ON(!rp);

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

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

int
A
Al Viro 已提交
3746
nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
L
Linus Torvalds 已提交
3747 3748 3749 3750
{
        return xdr_ressize_check(rqstp, p);
}

3751
int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
L
Linus Torvalds 已提交
3752
{
3753 3754 3755
	struct svc_rqst *rqstp = rq;
	struct nfsd4_compoundargs *args = rqstp->rq_argp;

L
Linus Torvalds 已提交
3756 3757 3758 3759
	if (args->ops != args->iops) {
		kfree(args->ops);
		args->ops = args->iops;
	}
J
Jesper Juhl 已提交
3760 3761
	kfree(args->tmpp);
	args->tmpp = NULL;
L
Linus Torvalds 已提交
3762 3763 3764 3765 3766 3767
	while (args->to_free) {
		struct tmpbuf *tb = args->to_free;
		args->to_free = tb->next;
		tb->release(tb->buf);
		kfree(tb);
	}
3768
	return 1;
L
Linus Torvalds 已提交
3769 3770 3771
}

int
A
Al Viro 已提交
3772
nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
L
Linus Torvalds 已提交
3773
{
3774 3775 3776 3777 3778 3779
	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
3780 3781 3782 3783 3784 3785 3786 3787 3788
	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;

3789
	return !nfsd4_decode_compound(args);
L
Linus Torvalds 已提交
3790 3791 3792
}

int
A
Al Viro 已提交
3793
nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
L
Linus Torvalds 已提交
3794 3795 3796 3797
{
	/*
	 * All that remains is to write the tag and operation count...
	 */
3798
	struct nfsd4_compound_state *cs = &resp->cstate;
3799 3800 3801 3802
	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);
3803

L
Linus Torvalds 已提交
3804 3805 3806 3807 3808 3809
	p = resp->tagp;
	*p++ = htonl(resp->taglen);
	memcpy(p, resp->tag, resp->taglen);
	p += XDR_QUADLEN(resp->taglen);
	*p++ = htonl(resp->opcnt);

3810
	if (nfsd4_has_session(cs)) {
3811 3812
		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
		struct nfs4_client *clp = cs->session->se_client;
3813 3814
		if (cs->status != nfserr_replay_cache) {
			nfsd4_store_cache_entry(resp);
3815
			cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3816
		}
3817
		/* Renew the clientid on success and on replay */
3818
		spin_lock(&nn->client_lock);
3819
		nfsd4_put_session(cs->session);
3820 3821
		spin_unlock(&nn->client_lock);
		put_client_renew(clp);
A
Andy Adamson 已提交
3822
	}
L
Linus Torvalds 已提交
3823 3824 3825 3826 3827 3828 3829 3830
	return 1;
}

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