nfs4xdr.c 98.4 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
Linus Torvalds 已提交
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
696 697 698 699 700 701
		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
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));
J
J. Bruce Fields 已提交
1036
	READ32(readdir->rd_dircount);
L
Linus Torvalds 已提交
1037 1038 1039 1040 1041 1042 1043
	READ32(readdir->rd_maxcount);
	if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
		goto out;

	DECODE_TAIL;
}

1044
static __be32
L
Linus Torvalds 已提交
1045 1046 1047 1048 1049 1050 1051 1052
nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(remove->rm_namelen);
	READ_BUF(remove->rm_namelen);
	SAVEMEM(remove->rm_name, remove->rm_namelen);
1053
	if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
L
Linus Torvalds 已提交
1054 1055 1056 1057 1058
		return status;

	DECODE_TAIL;
}

1059
static __be32
L
Linus Torvalds 已提交
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070
nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(rename->rn_snamelen);
	READ_BUF(rename->rn_snamelen + 4);
	SAVEMEM(rename->rn_sname, rename->rn_snamelen);
	READ32(rename->rn_tnamelen);
	READ_BUF(rename->rn_tnamelen);
	SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1071
	if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
L
Linus Torvalds 已提交
1072
		return status;
1073
	if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
L
Linus Torvalds 已提交
1074 1075 1076 1077 1078
		return status;

	DECODE_TAIL;
}

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

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

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

	DECODE_TAIL;
}

A
Andy Adamson 已提交
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102
static __be32
nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
		     struct nfsd4_secinfo *secinfo)
{
	DECODE_HEAD;

	READ_BUF(4);
	READ32(secinfo->si_namelen);
	READ_BUF(secinfo->si_namelen);
	SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1103
	status = check_filename(secinfo->si_name, secinfo->si_namelen);
A
Andy Adamson 已提交
1104 1105 1106 1107 1108
	if (status)
		return status;
	DECODE_TAIL;
}

J
J. Bruce Fields 已提交
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
static __be32
nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
		     struct nfsd4_secinfo_no_name *sin)
{
	DECODE_HEAD;

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

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

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

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

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

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

1143 1144 1145 1146
	status = nfsd4_decode_opaque(argp, &setclientid->se_name);
	if (status)
		return nfserr_bad_xdr;
	READ_BUF(8);
L
Linus Torvalds 已提交
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160
	READ32(setclientid->se_callback_prog);
	READ32(setclientid->se_callback_netid_len);

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

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

	DECODE_TAIL;
}

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

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

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

	DECODE_TAIL;
}

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

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

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

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

	DECODE_TAIL;
}

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

1203 1204 1205 1206
	status = nfsd4_decode_stateid(argp, &write->wr_stateid);
	if (status)
		return status;
	READ_BUF(16);
L
Linus Torvalds 已提交
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
	READ64(write->wr_offset);
	READ32(write->wr_stable_how);
	if (write->wr_stable_how > 2)
		goto xdr_error;
	READ32(write->wr_buflen);

	/* Sorry .. no magic macros for this.. *
	 * READ_BUF(write->wr_buflen);
	 * SAVEMEM(write->wr_buf, write->wr_buflen);
	 */
	avail = (char*)argp->end - (char*)argp->p;
	if (avail + argp->pagelen < write->wr_buflen) {
1219 1220
		dprintk("NFSD: xdr error (%s:%d)\n",
				__FILE__, __LINE__);
L
Linus Torvalds 已提交
1221 1222
		goto xdr_error;
	}
1223 1224 1225
	write->wr_head.iov_base = p;
	write->wr_head.iov_len = avail;
	write->wr_pagelist = argp->pagelist;
J
J. Bruce Fields 已提交
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238

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

		len -= avail;

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

		argp->p = (__be32 *)page_address(argp->pagelist[0]);
1239
		argp->pagelist++;
J
J. Bruce Fields 已提交
1240
		argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
L
Linus Torvalds 已提交
1241
	}
J
J. Bruce Fields 已提交
1242
	argp->p += XDR_QUADLEN(len);
L
Linus Torvalds 已提交
1243 1244 1245 1246

	DECODE_TAIL;
}

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

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

L
Linus Torvalds 已提交
1255 1256 1257 1258 1259 1260
	READ_BUF(12);
	COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
	READ32(rlockowner->rl_owner.len);
	READ_BUF(rlockowner->rl_owner.len);
	READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);

A
Andy Adamson 已提交
1261 1262
	if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
		return nfserr_inval;
L
Linus Torvalds 已提交
1263 1264 1265
	DECODE_TAIL;
}

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

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

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

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

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

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

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

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

		/* ssp_encr_algs<> */
		READ_BUF(4);
1326 1327 1328 1329 1330 1331 1332
		READ32(tmp);
		while (tmp--) {
			READ_BUF(4);
			READ32(dummy);
			READ_BUF(dummy);
			p += XDR_QUADLEN(dummy);
		}
A
Andy Adamson 已提交
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367

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

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

	if (dummy > 1)
		goto xdr_error;

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

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

		/* nii_date */
		READ_BUF(12);
		p += 3;
	}
	DECODE_TAIL;
A
Andy Adamson 已提交
1368 1369 1370 1371 1372 1373
}

static __be32
nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
			    struct nfsd4_create_session *sess)
{
A
Andy Adamson 已提交
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
	DECODE_HEAD;
	u32 dummy;

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

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

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

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

static __be32
nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
			     struct nfsd4_destroy_session *destroy_session)
{
B
Benny Halevy 已提交
1426 1427 1428 1429 1430
	DECODE_HEAD;
	READ_BUF(NFS4_MAX_SESSIONID_LEN);
	COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);

	DECODE_TAIL;
A
Andy Adamson 已提交
1431 1432
}

1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
static __be32
nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
			  struct nfsd4_free_stateid *free_stateid)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

A
Andy Adamson 已提交
1446 1447 1448 1449
static __be32
nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
		      struct nfsd4_sequence *seq)
{
B
Benny Halevy 已提交
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
	DECODE_HEAD;

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

	DECODE_TAIL;
A
Andy Adamson 已提交
1460 1461
}

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

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

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

	for (i = 0; i < test_stateid->ts_num_ids; i++) {
1475 1476
		stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
		if (!stateid) {
1477
			status = nfserrno(-ENOMEM);
1478 1479 1480 1481 1482 1483 1484 1485
			goto out;
		}

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

		status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1486
		if (status)
1487
			goto out;
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498
	}

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

1499 1500 1501 1502 1503 1504 1505 1506 1507 1508
static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

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

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

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

static nfsd4_dec nfsd4_dec_ops[] = {
1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553
	[OP_ACCESS]		= (nfsd4_dec)nfsd4_decode_access,
	[OP_CLOSE]		= (nfsd4_dec)nfsd4_decode_close,
	[OP_COMMIT]		= (nfsd4_dec)nfsd4_decode_commit,
	[OP_CREATE]		= (nfsd4_dec)nfsd4_decode_create,
	[OP_DELEGPURGE]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_DELEGRETURN]	= (nfsd4_dec)nfsd4_decode_delegreturn,
	[OP_GETATTR]		= (nfsd4_dec)nfsd4_decode_getattr,
	[OP_GETFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_LINK]		= (nfsd4_dec)nfsd4_decode_link,
	[OP_LOCK]		= (nfsd4_dec)nfsd4_decode_lock,
	[OP_LOCKT]		= (nfsd4_dec)nfsd4_decode_lockt,
	[OP_LOCKU]		= (nfsd4_dec)nfsd4_decode_locku,
	[OP_LOOKUP]		= (nfsd4_dec)nfsd4_decode_lookup,
	[OP_LOOKUPP]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_NVERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
	[OP_OPEN]		= (nfsd4_dec)nfsd4_decode_open,
	[OP_OPENATTR]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_OPEN_CONFIRM]	= (nfsd4_dec)nfsd4_decode_open_confirm,
	[OP_OPEN_DOWNGRADE]	= (nfsd4_dec)nfsd4_decode_open_downgrade,
	[OP_PUTFH]		= (nfsd4_dec)nfsd4_decode_putfh,
1554
	[OP_PUTPUBFH]		= (nfsd4_dec)nfsd4_decode_putpubfh,
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570
	[OP_PUTROOTFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_READ]		= (nfsd4_dec)nfsd4_decode_read,
	[OP_READDIR]		= (nfsd4_dec)nfsd4_decode_readdir,
	[OP_READLINK]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_REMOVE]		= (nfsd4_dec)nfsd4_decode_remove,
	[OP_RENAME]		= (nfsd4_dec)nfsd4_decode_rename,
	[OP_RENEW]		= (nfsd4_dec)nfsd4_decode_renew,
	[OP_RESTOREFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_SAVEFH]		= (nfsd4_dec)nfsd4_decode_noop,
	[OP_SECINFO]		= (nfsd4_dec)nfsd4_decode_secinfo,
	[OP_SETATTR]		= (nfsd4_dec)nfsd4_decode_setattr,
	[OP_SETCLIENTID]	= (nfsd4_dec)nfsd4_decode_setclientid,
	[OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
	[OP_VERIFY]		= (nfsd4_dec)nfsd4_decode_verify,
	[OP_WRITE]		= (nfsd4_dec)nfsd4_decode_write,
	[OP_RELEASE_LOCKOWNER]	= (nfsd4_dec)nfsd4_decode_release_lockowner,
A
Andy Adamson 已提交
1571 1572

	/* new operations for NFSv4.1 */
1573
	[OP_BACKCHANNEL_CTL]	= (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1574
	[OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
R
Randy Dunlap 已提交
1575 1576 1577
	[OP_EXCHANGE_ID]	= (nfsd4_dec)nfsd4_decode_exchange_id,
	[OP_CREATE_SESSION]	= (nfsd4_dec)nfsd4_decode_create_session,
	[OP_DESTROY_SESSION]	= (nfsd4_dec)nfsd4_decode_destroy_session,
1578
	[OP_FREE_STATEID]	= (nfsd4_dec)nfsd4_decode_free_stateid,
R
Randy Dunlap 已提交
1579 1580 1581 1582 1583 1584
	[OP_GET_DIR_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_GETDEVICEINFO]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_GETDEVICELIST]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_LAYOUTCOMMIT]	= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_LAYOUTGET]		= (nfsd4_dec)nfsd4_decode_notsupp,
	[OP_LAYOUTRETURN]	= (nfsd4_dec)nfsd4_decode_notsupp,
J
J. Bruce Fields 已提交
1585
	[OP_SECINFO_NO_NAME]	= (nfsd4_dec)nfsd4_decode_secinfo_no_name,
R
Randy Dunlap 已提交
1586 1587
	[OP_SEQUENCE]		= (nfsd4_dec)nfsd4_decode_sequence,
	[OP_SET_SSV]		= (nfsd4_dec)nfsd4_decode_notsupp,
1588
	[OP_TEST_STATEID]	= (nfsd4_dec)nfsd4_decode_test_stateid,
R
Randy Dunlap 已提交
1589
	[OP_WANT_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,
1590
	[OP_DESTROY_CLIENTID]	= (nfsd4_dec)nfsd4_decode_destroy_clientid,
1591
	[OP_RECLAIM_COMPLETE]	= (nfsd4_dec)nfsd4_decode_reclaim_complete,
A
Andy Adamson 已提交
1592 1593
};

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

1608
static __be32
L
Linus Torvalds 已提交
1609 1610 1611 1612
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
	DECODE_HEAD;
	struct nfsd4_op *op;
1613
	bool cachethis = false;
1614
	int max_reply = 2 * RPC_MAX_AUTH_SIZE + 8; /* opcnt, status */
1615 1616
	int readcount = 0;
	int readbytes = 0;
L
Linus Torvalds 已提交
1617 1618 1619 1620 1621 1622 1623 1624
	int i;

	READ_BUF(4);
	READ32(argp->taglen);
	READ_BUF(argp->taglen + 8);
	SAVEMEM(argp->tag, argp->taglen);
	READ32(argp->minorversion);
	READ32(argp->opcnt);
1625
	max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
L
Linus Torvalds 已提交
1626 1627 1628 1629 1630 1631

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

1632
	if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
L
Linus Torvalds 已提交
1633 1634 1635
		argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
		if (!argp->ops) {
			argp->ops = argp->iops;
1636
			dprintk("nfsd: couldn't allocate room for COMPOUND\n");
L
Linus Torvalds 已提交
1637 1638 1639 1640
			goto xdr_error;
		}
	}

1641
	if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1642 1643
		argp->opcnt = 0;

L
Linus Torvalds 已提交
1644 1645 1646 1647
	for (i = 0; i < argp->opcnt; i++) {
		op = &argp->ops[i];
		op->replay = NULL;

J
J. Bruce Fields 已提交
1648 1649
		READ_BUF(4);
		READ32(op->opnum);
L
Linus Torvalds 已提交
1650

1651 1652
		if (nfsd4_opnum_in_range(argp, op))
			op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1653
		else {
L
Linus Torvalds 已提交
1654 1655 1656
			op->opnum = OP_ILLEGAL;
			op->status = nfserr_op_illegal;
		}
1657 1658 1659 1660 1661
		/*
		 * 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);
1662

1663 1664 1665 1666 1667
		if (op->opnum == OP_READ) {
			readcount++;
			readbytes += nfsd4_max_reply(argp->rqstp, op);
		} else
			max_reply += nfsd4_max_reply(argp->rqstp, op);
1668 1669 1670 1671 1672

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

1680 1681 1682
	if (readcount > 1 || max_reply > PAGE_SIZE - 2*RPC_MAX_AUTH_SIZE)
		argp->rqstp->rq_splice_ok = false;

L
Linus Torvalds 已提交
1683 1684 1685 1686 1687 1688 1689 1690
	DECODE_TAIL;
}

#define WRITE32(n)               *p++ = htonl(n)
#define WRITE64(n)               do {				\
	*p++ = htonl((u32)((n) >> 32));				\
	*p++ = htonl((u32)(n));					\
} while (0)
1691
#define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {		\
L
Linus Torvalds 已提交
1692 1693 1694
	*(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
	memcpy(p, ptr, nbytes);					\
	p += XDR_QUADLEN(nbytes);				\
1695
}} while (0)
J
J. Bruce Fields 已提交
1696 1697 1698

static void write32(__be32 **p, u32 n)
{
1699
	*(*p)++ = htonl(n);
J
J. Bruce Fields 已提交
1700 1701 1702 1703
}

static void write64(__be32 **p, u64 n)
{
1704
	write32(p, (n >> 32));
J
J. Bruce Fields 已提交
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730
	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
1731

1732
/* Encode as an array of strings the string given with components
1733
 * separated @sep, escaped with esc_enter and esc_exit.
1734
 */
1735 1736 1737
static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
					  char *components, char esc_enter,
					  char esc_exit)
1738
{
1739
	__be32 *p;
1740 1741
	__be32 pathlen;
	int pathlen_offset;
1742
	int strlen, count=0;
1743
	char *str, *end, *next;
1744 1745

	dprintk("nfsd4_encode_components(%s)\n", components);
1746 1747

	pathlen_offset = xdr->buf->len;
1748 1749
	p = xdr_reserve_space(xdr, 4);
	if (!p)
1750
		return nfserr_resource;
1751 1752
	p++; /* We will fill this in with @count later */

1753 1754
	end = str = components;
	while (*end) {
1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771
		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 */;

1772 1773
		strlen = end - str;
		if (strlen) {
1774 1775
			p = xdr_reserve_space(xdr, strlen + 4);
			if (!p)
1776 1777 1778 1779 1780 1781 1782 1783 1784
				return nfserr_resource;
			WRITE32(strlen);
			WRITEMEM(str, strlen);
			count++;
		}
		else
			end++;
		str = end;
	}
1785 1786
	pathlen = htonl(xdr->buf->len - pathlen_offset);
	write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1787 1788 1789
	return 0;
}

1790 1791 1792
/* Encode as an array of strings the string given with components
 * separated @sep.
 */
1793 1794
static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
				      char *components)
1795
{
1796
	return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1797 1798
}

1799 1800 1801
/*
 * encode a location element of a fs_locations structure
 */
1802 1803
static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
					struct nfsd4_fs_location *location)
1804
{
1805
	__be32 status;
1806

1807
	status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1808
						'[', ']');
1809 1810
	if (status)
		return status;
1811
	status = nfsd4_encode_components(xdr, '/', location->path);
1812 1813 1814 1815 1816 1817
	if (status)
		return status;
	return 0;
}

/*
T
Trond Myklebust 已提交
1818
 * Encode a path in RFC3530 'pathname4' format
1819
 */
1820 1821 1822
static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
				const struct path *root,
				const struct path *path)
1823
{
1824
	struct path cur = *path;
1825
	__be32 *p;
T
Trond Myklebust 已提交
1826 1827 1828
	struct dentry **components = NULL;
	unsigned int ncomponents = 0;
	__be32 err = nfserr_jukebox;
1829

T
Trond Myklebust 已提交
1830
	dprintk("nfsd4_encode_components(");
1831

T
Trond Myklebust 已提交
1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855
	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);
	}
1856 1857 1858
	err = nfserr_resource;
	p = xdr_reserve_space(xdr, 4);
	if (!p)
T
Trond Myklebust 已提交
1859 1860 1861 1862 1863
		goto out_free;
	WRITE32(ncomponents);

	while (ncomponents) {
		struct dentry *dentry = components[ncomponents - 1];
1864
		unsigned int len;
T
Trond Myklebust 已提交
1865

1866 1867
		spin_lock(&dentry->d_lock);
		len = dentry->d_name.len;
1868 1869
		p = xdr_reserve_space(xdr, len + 4);
		if (!p) {
1870
			spin_unlock(&dentry->d_lock);
T
Trond Myklebust 已提交
1871
			goto out_free;
1872
		}
T
Trond Myklebust 已提交
1873 1874 1875
		WRITE32(len);
		WRITEMEM(dentry->d_name.name, len);
		dprintk("/%s", dentry->d_name.name);
1876
		spin_unlock(&dentry->d_lock);
T
Trond Myklebust 已提交
1877 1878
		dput(dentry);
		ncomponents--;
1879
	}
T
Trond Myklebust 已提交
1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890

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

1891 1892
static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
			struct svc_rqst *rqstp, const struct path *path)
T
Trond Myklebust 已提交
1893 1894 1895 1896 1897 1898 1899
{
	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));
1900
	res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
T
Trond Myklebust 已提交
1901 1902
	exp_put(exp_ps);
	return res;
1903 1904 1905 1906 1907
}

/*
 *  encode a fs_locations structure
 */
1908 1909
static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
			struct svc_rqst *rqstp, struct svc_export *exp)
1910
{
1911
	__be32 status;
1912
	int i;
1913
	__be32 *p;
1914 1915
	struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;

1916
	status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1917 1918
	if (status)
		return status;
1919 1920
	p = xdr_reserve_space(xdr, 4);
	if (!p)
1921 1922 1923
		return nfserr_resource;
	WRITE32(fslocs->locations_count);
	for (i=0; i<fslocs->locations_count; i++) {
1924
		status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1925 1926 1927 1928 1929
		if (status)
			return status;
	}
	return 0;
}
L
Linus Torvalds 已提交
1930

1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
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
1944

1945
static inline __be32
1946 1947
nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
		     struct nfs4_ace *ace)
L
Linus Torvalds 已提交
1948
{
1949
	if (ace->whotype != NFS4_ACL_WHO_NAMED)
1950
		return nfs4_acl_write_who(xdr, ace->whotype);
1951
	else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1952
		return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1953
	else
1954
		return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
L
Linus Torvalds 已提交
1955 1956
}

1957 1958 1959 1960
#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

1961 1962
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
static inline __be32
1963 1964
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
			    void *context, int len)
1965
{
1966
	__be32 *p;
1967

1968 1969
	p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
	if (!p)
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
		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
1983 1984
nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
			    void *context, int len)
1985 1986 1987
{ return 0; }
#endif

1988
static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
{
	/* 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
2003

2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014

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
2015
	err = vfs_getattr(&path, stat);
2016 2017 2018 2019
	path_put(&path);
	return err;
}

L
Linus Torvalds 已提交
2020 2021 2022 2023
/*
 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
 * ourselves.
 */
2024
__be32
2025 2026 2027
nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
		struct svc_export *exp,
		struct dentry *dentry, u32 *bmval,
2028
		struct svc_rqst *rqstp, int ignore_crossmnt)
L
Linus Torvalds 已提交
2029 2030 2031
{
	u32 bmval0 = bmval[0];
	u32 bmval1 = bmval[1];
2032
	u32 bmval2 = bmval[2];
L
Linus Torvalds 已提交
2033
	struct kstat stat;
2034
	struct svc_fh *tempfh = NULL;
L
Linus Torvalds 已提交
2035
	struct kstatfs statfs;
2036
	__be32 *p;
J
J. Bruce Fields 已提交
2037
	int starting_len = xdr->buf->len;
2038 2039
	int attrlen_offset;
	__be32 attrlen;
L
Linus Torvalds 已提交
2040 2041
	u32 dummy;
	u64 dummy64;
2042
	u32 rdattr_err = 0;
2043
	__be32 status;
2044
	int err;
L
Linus Torvalds 已提交
2045 2046
	int aclsupport = 0;
	struct nfs4_acl *acl = NULL;
2047 2048 2049
	void *context = NULL;
	int contextlen;
	bool contextsupport = false;
2050 2051
	struct nfsd4_compoundres *resp = rqstp->rq_resp;
	u32 minorversion = resp->cstate.minorversion;
2052 2053 2054 2055
	struct path path = {
		.mnt	= exp->ex_path.mnt,
		.dentry	= dentry,
	};
2056
	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
L
Linus Torvalds 已提交
2057 2058

	BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2059 2060 2061
	BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
	BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
	BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
L
Linus Torvalds 已提交
2062

2063
	if (exp->ex_fslocs.migrated) {
2064
		BUG_ON(bmval[2]);
2065 2066 2067 2068 2069
		status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
		if (status)
			goto out;
	}

A
Al Viro 已提交
2070
	err = vfs_getattr(&path, &stat);
2071
	if (err)
L
Linus Torvalds 已提交
2072
		goto out_nfserr;
2073 2074
	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
			FATTR4_WORD0_MAXNAME)) ||
L
Linus Torvalds 已提交
2075 2076
	    (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
		       FATTR4_WORD1_SPACE_TOTAL))) {
2077
		err = vfs_statfs(&path, &statfs);
2078
		if (err)
L
Linus Torvalds 已提交
2079 2080 2081
			goto out_nfserr;
	}
	if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2082 2083 2084 2085 2086 2087
		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
2088 2089
		if (status)
			goto out;
2090
		fhp = tempfh;
L
Linus Torvalds 已提交
2091 2092 2093
	}
	if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
			| FATTR4_WORD0_SUPPORTED_ATTRS)) {
2094 2095
		err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
		aclsupport = (err == 0);
L
Linus Torvalds 已提交
2096
		if (bmval0 & FATTR4_WORD0_ACL) {
2097
			if (err == -EOPNOTSUPP)
L
Linus Torvalds 已提交
2098
				bmval0 &= ~FATTR4_WORD0_ACL;
2099
			else if (err == -EINVAL) {
L
Linus Torvalds 已提交
2100 2101
				status = nfserr_attrnotsupp;
				goto out;
2102
			} else if (err != 0)
L
Linus Torvalds 已提交
2103 2104 2105 2106
				goto out_nfserr;
		}
	}

2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121
#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 */

2122
	if (bmval2) {
2123 2124
		p = xdr_reserve_space(xdr, 16);
		if (!p)
2125
			goto out_resource;
2126 2127 2128 2129
		WRITE32(3);
		WRITE32(bmval0);
		WRITE32(bmval1);
		WRITE32(bmval2);
2130
	} else if (bmval1) {
2131 2132
		p = xdr_reserve_space(xdr, 12);
		if (!p)
2133
			goto out_resource;
2134 2135 2136 2137
		WRITE32(2);
		WRITE32(bmval0);
		WRITE32(bmval1);
	} else {
2138 2139
		p = xdr_reserve_space(xdr, 8);
		if (!p)
2140
			goto out_resource;
2141 2142 2143
		WRITE32(1);
		WRITE32(bmval0);
	}
2144 2145

	attrlen_offset = xdr->buf->len;
2146 2147 2148
	p = xdr_reserve_space(xdr, 4);
	if (!p)
		goto out_resource;
2149
	p++;                /* to be backfilled later */
L
Linus Torvalds 已提交
2150 2151

	if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2152 2153 2154 2155
		u32 word0 = nfsd_suppattrs0(minorversion);
		u32 word1 = nfsd_suppattrs1(minorversion);
		u32 word2 = nfsd_suppattrs2(minorversion);

2156 2157
		if (!aclsupport)
			word0 &= ~FATTR4_WORD0_ACL;
2158 2159
		if (!contextsupport)
			word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2160
		if (!word2) {
2161 2162
			p = xdr_reserve_space(xdr, 12);
			if (!p)
2163
				goto out_resource;
2164 2165 2166 2167
			WRITE32(2);
			WRITE32(word0);
			WRITE32(word1);
		} else {
2168 2169
			p = xdr_reserve_space(xdr, 16);
			if (!p)
2170
				goto out_resource;
2171 2172 2173 2174 2175
			WRITE32(3);
			WRITE32(word0);
			WRITE32(word1);
			WRITE32(word2);
		}
L
Linus Torvalds 已提交
2176 2177
	}
	if (bmval0 & FATTR4_WORD0_TYPE) {
2178 2179
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2180
			goto out_resource;
2181
		dummy = nfs4_file_type(stat.mode);
2182 2183 2184 2185
		if (dummy == NF4BAD) {
			status = nfserr_serverfault;
			goto out;
		}
L
Linus Torvalds 已提交
2186 2187 2188
		WRITE32(dummy);
	}
	if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2189 2190
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2191
			goto out_resource;
N
NeilBrown 已提交
2192
		if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
N
NeilBrown 已提交
2193
			WRITE32(NFS4_FH_PERSISTENT);
N
NeilBrown 已提交
2194
		else
N
NeilBrown 已提交
2195
			WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
L
Linus Torvalds 已提交
2196 2197
	}
	if (bmval0 & FATTR4_WORD0_CHANGE) {
2198 2199
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2200
			goto out_resource;
J
J. Bruce Fields 已提交
2201
		write_change(&p, &stat, dentry->d_inode);
L
Linus Torvalds 已提交
2202 2203
	}
	if (bmval0 & FATTR4_WORD0_SIZE) {
2204 2205
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2206 2207 2208 2209
			goto out_resource;
		WRITE64(stat.size);
	}
	if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2210 2211
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2212 2213 2214 2215
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2216 2217
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2218 2219 2220 2221
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2222 2223
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2224 2225 2226 2227
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_FSID) {
2228 2229
		p = xdr_reserve_space(xdr, 16);
		if (!p)
L
Linus Torvalds 已提交
2230
			goto out_resource;
2231 2232 2233
		if (exp->ex_fslocs.migrated) {
			WRITE64(NFS4_REFERRAL_FSID_MAJOR);
			WRITE64(NFS4_REFERRAL_FSID_MINOR);
2234 2235
		} else switch(fsid_source(fhp)) {
		case FSIDSOURCE_FSID:
L
Linus Torvalds 已提交
2236 2237
			WRITE64((u64)exp->ex_fsid);
			WRITE64((u64)0);
2238 2239
			break;
		case FSIDSOURCE_DEV:
L
Linus Torvalds 已提交
2240 2241 2242 2243
			WRITE32(0);
			WRITE32(MAJOR(stat.dev));
			WRITE32(0);
			WRITE32(MINOR(stat.dev));
2244 2245 2246 2247
			break;
		case FSIDSOURCE_UUID:
			WRITEMEM(exp->ex_uuid, 16);
			break;
L
Linus Torvalds 已提交
2248 2249 2250
		}
	}
	if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2251 2252
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2253 2254 2255 2256
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2257 2258
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2259
			goto out_resource;
2260
		WRITE32(nn->nfsd4_lease);
L
Linus Torvalds 已提交
2261 2262
	}
	if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2263 2264
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2265
			goto out_resource;
2266
		WRITE32(rdattr_err);
L
Linus Torvalds 已提交
2267 2268 2269 2270 2271
	}
	if (bmval0 & FATTR4_WORD0_ACL) {
		struct nfs4_ace *ace;

		if (acl == NULL) {
2272 2273
			p = xdr_reserve_space(xdr, 4);
			if (!p)
L
Linus Torvalds 已提交
2274 2275 2276 2277 2278
				goto out_resource;

			WRITE32(0);
			goto out_acl;
		}
2279 2280
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2281 2282 2283
			goto out_resource;
		WRITE32(acl->naces);

2284
		for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2285 2286
			p = xdr_reserve_space(xdr, 4*3);
			if (!p)
L
Linus Torvalds 已提交
2287 2288 2289 2290
				goto out_resource;
			WRITE32(ace->type);
			WRITE32(ace->flag);
			WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2291
			status = nfsd4_encode_aclname(xdr, rqstp, ace);
L
Linus Torvalds 已提交
2292 2293 2294 2295 2296 2297
			if (status)
				goto out;
		}
	}
out_acl:
	if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2298 2299
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2300 2301 2302 2303 2304
			goto out_resource;
		WRITE32(aclsupport ?
			ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
	}
	if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2305 2306
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2307 2308 2309 2310
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2311 2312
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2313
			goto out_resource;
2314
		WRITE32(0);
L
Linus Torvalds 已提交
2315 2316
	}
	if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2317 2318
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2319 2320 2321 2322
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2323 2324
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2325 2326 2327 2328
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2329 2330
		p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
		if (!p)
L
Linus Torvalds 已提交
2331 2332 2333 2334 2335
			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) {
2336 2337
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2338
			goto out_resource;
2339
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
2340 2341
	}
	if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2342 2343
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2344 2345 2346 2347
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2348 2349
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2350 2351 2352 2353
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2354 2355
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2356 2357 2358
			goto out_resource;
		WRITE64((u64) statfs.f_files);
	}
2359
	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2360
		status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2361 2362 2363
		if (status)
			goto out;
	}
L
Linus Torvalds 已提交
2364
	if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2365 2366
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2367 2368 2369 2370
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2371 2372
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2373
			goto out_resource;
2374
		WRITE64(exp->ex_path.mnt->mnt_sb->s_maxbytes);
L
Linus Torvalds 已提交
2375 2376
	}
	if (bmval0 & FATTR4_WORD0_MAXLINK) {
2377 2378
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2379 2380 2381 2382
			goto out_resource;
		WRITE32(255);
	}
	if (bmval0 & FATTR4_WORD0_MAXNAME) {
2383 2384
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2385
			goto out_resource;
2386
		WRITE32(statfs.f_namelen);
L
Linus Torvalds 已提交
2387 2388
	}
	if (bmval0 & FATTR4_WORD0_MAXREAD) {
2389 2390
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2391
			goto out_resource;
2392
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
2393 2394
	}
	if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2395 2396
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2397
			goto out_resource;
2398
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
2399 2400
	}
	if (bmval1 & FATTR4_WORD1_MODE) {
2401 2402
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2403 2404 2405 2406
			goto out_resource;
		WRITE32(stat.mode & S_IALLUGO);
	}
	if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2407 2408
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2409 2410 2411 2412
			goto out_resource;
		WRITE32(1);
	}
	if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2413 2414
		p = xdr_reserve_space(xdr, 4);
		if (!p)
L
Linus Torvalds 已提交
2415 2416 2417 2418
			goto out_resource;
		WRITE32(stat.nlink);
	}
	if (bmval1 & FATTR4_WORD1_OWNER) {
2419
		status = nfsd4_encode_user(xdr, rqstp, stat.uid);
L
Linus Torvalds 已提交
2420 2421 2422 2423
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2424
		status = nfsd4_encode_group(xdr, rqstp, stat.gid);
L
Linus Torvalds 已提交
2425 2426 2427 2428
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_RAWDEV) {
2429 2430
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2431 2432 2433 2434 2435
			goto out_resource;
		WRITE32((u32) MAJOR(stat.rdev));
		WRITE32((u32) MINOR(stat.rdev));
	}
	if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2436 2437
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2438 2439 2440 2441 2442
			goto out_resource;
		dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2443 2444
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2445 2446 2447 2448 2449
			goto out_resource;
		dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2450 2451
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2452 2453 2454 2455 2456
			goto out_resource;
		dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2457 2458
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2459 2460 2461 2462 2463
			goto out_resource;
		dummy64 = (u64)stat.blocks << 9;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2464 2465
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2466
			goto out_resource;
2467
		WRITE64((s64)stat.atime.tv_sec);
L
Linus Torvalds 已提交
2468 2469 2470
		WRITE32(stat.atime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2471 2472
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2473 2474 2475 2476 2477 2478
			goto out_resource;
		WRITE32(0);
		WRITE32(1);
		WRITE32(0);
	}
	if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2479 2480
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2481
			goto out_resource;
2482
		WRITE64((s64)stat.ctime.tv_sec);
L
Linus Torvalds 已提交
2483 2484 2485
		WRITE32(stat.ctime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2486 2487
		p = xdr_reserve_space(xdr, 12);
		if (!p)
L
Linus Torvalds 已提交
2488
			goto out_resource;
2489
		WRITE64((s64)stat.mtime.tv_sec);
L
Linus Torvalds 已提交
2490 2491 2492
		WRITE32(stat.mtime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2493 2494
		p = xdr_reserve_space(xdr, 8);
		if (!p)
L
Linus Torvalds 已提交
2495
                	goto out_resource;
2496 2497 2498 2499 2500
		/*
		 * Get parent's attributes if not ignoring crossmount
		 * and this is the root of a cross-mounted filesystem.
		 */
		if (ignore_crossmnt == 0 &&
2501 2502
		    dentry == exp->ex_path.mnt->mnt_root)
			get_parent_attributes(exp, &stat);
2503
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
2504
	}
2505
	if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2506 2507
		status = nfsd4_encode_security_label(xdr, rqstp, context,
								contextlen);
2508 2509 2510
		if (status)
			goto out;
	}
2511
	if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2512 2513
		p = xdr_reserve_space(xdr, 16);
		if (!p)
2514
			goto out_resource;
2515 2516 2517 2518 2519
		WRITE32(3);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
		WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
	}
2520

2521 2522
	attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
	write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
L
Linus Torvalds 已提交
2523 2524 2525
	status = nfs_ok;

out:
2526
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2527 2528
	if (context)
		security_release_secctx(context, contextlen);
2529
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2530
	kfree(acl);
2531
	if (tempfh) {
2532
		fh_put(tempfh);
2533 2534
		kfree(tempfh);
	}
J
J. Bruce Fields 已提交
2535 2536
	if (status)
		xdr_truncate_encode(xdr, starting_len);
L
Linus Torvalds 已提交
2537 2538
	return status;
out_nfserr:
2539
	status = nfserrno(err);
L
Linus Torvalds 已提交
2540 2541 2542 2543 2544 2545
	goto out;
out_resource:
	status = nfserr_resource;
	goto out;
}

2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560
static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
				struct xdr_buf *buf, __be32 *p, int bytes)
{
	xdr->scratch.iov_len = 0;
	memset(buf, 0, sizeof(struct xdr_buf));
	buf->head[0].iov_base = p;
	buf->head[0].iov_len = 0;
	buf->len = 0;
	xdr->buf = buf;
	xdr->iov = buf->head;
	xdr->p = p;
	xdr->end = (void *)p + bytes;
	buf->buflen = bytes;
}

2561 2562 2563 2564 2565
__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)
{
2566
	struct xdr_buf dummy;
2567 2568 2569
	struct xdr_stream xdr;
	__be32 ret;

2570
	svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2571 2572 2573 2574 2575 2576
	ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
							ignore_crossmnt);
	*p = xdr.p;
	return ret;
}

2577 2578 2579 2580 2581 2582 2583 2584 2585
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;
}

2586
static __be32
J
J. Bruce Fields 已提交
2587 2588
nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
			const char *name, int namlen)
L
Linus Torvalds 已提交
2589 2590 2591
{
	struct svc_export *exp = cd->rd_fhp->fh_export;
	struct dentry *dentry;
2592
	__be32 nfserr;
2593
	int ignore_crossmnt = 0;
L
Linus Torvalds 已提交
2594 2595 2596 2597

	dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
	if (IS_ERR(dentry))
		return nfserrno(PTR_ERR(dentry));
2598 2599 2600 2601 2602 2603 2604 2605 2606
	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
2607 2608

	exp_get(exp);
2609 2610 2611 2612 2613 2614 2615
	/*
	 * 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.
	 */
2616
	if (nfsd_mountpoint(dentry, exp)) {
2617 2618
		int err;

2619 2620 2621 2622 2623
		if (!(exp->ex_flags & NFSEXP_V4ROOT)
				&& !attributes_need_mount(cd->rd_bmval)) {
			ignore_crossmnt = 1;
			goto out_encode;
		}
A
Andy Adamson 已提交
2624 2625 2626 2627 2628
		/*
		 * Why the heck aren't we just using nfsd_lookup??
		 * Different "."/".." handling?  Something else?
		 * At least, add a comment here to explain....
		 */
2629 2630 2631
		err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
		if (err) {
			nfserr = nfserrno(err);
L
Linus Torvalds 已提交
2632 2633
			goto out_put;
		}
A
Andy Adamson 已提交
2634 2635 2636
		nfserr = check_nfsd_access(exp, cd->rd_rqstp);
		if (nfserr)
			goto out_put;
L
Linus Torvalds 已提交
2637 2638

	}
2639
out_encode:
J
J. Bruce Fields 已提交
2640
	nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2641
					cd->rd_rqstp, ignore_crossmnt);
L
Linus Torvalds 已提交
2642 2643 2644 2645 2646 2647
out_put:
	dput(dentry);
	exp_put(exp);
	return nfserr;
}

A
Al Viro 已提交
2648
static __be32 *
J
J. Bruce Fields 已提交
2649
nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
L
Linus Torvalds 已提交
2650
{
J
J. Bruce Fields 已提交
2651 2652 2653 2654
	__be32 *p;

	p = xdr_reserve_space(xdr, 6);
	if (!p)
L
Linus Torvalds 已提交
2655 2656 2657 2658 2659
		return NULL;
	*p++ = htonl(2);
	*p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
	*p++ = htonl(0);			 /* bmval1 */

2660
	*p++ = htonl(4);     /* attribute length */
L
Linus Torvalds 已提交
2661 2662 2663 2664 2665
	*p++ = nfserr;       /* no htonl */
	return p;
}

static int
2666 2667
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
2668
{
2669
	struct readdir_cd *ccd = ccdv;
L
Linus Torvalds 已提交
2670
	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
J
J. Bruce Fields 已提交
2671 2672 2673 2674
	struct xdr_stream *xdr = cd->xdr;
	int start_offset = xdr->buf->len;
	int cookie_offset;
	int entry_bytes;
2675
	__be32 nfserr = nfserr_toosmall;
J
J. Bruce Fields 已提交
2676 2677
	__be64 wire_offset;
	__be32 *p;
L
Linus Torvalds 已提交
2678 2679 2680 2681 2682 2683 2684

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

J
J. Bruce Fields 已提交
2685 2686 2687 2688 2689
	if (cd->cookie_offset) {
		wire_offset = cpu_to_be64(offset);
		write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
							&wire_offset, 8);
	}
L
Linus Torvalds 已提交
2690

J
J. Bruce Fields 已提交
2691 2692
	p = xdr_reserve_space(xdr, 4);
	if (!p)
L
Linus Torvalds 已提交
2693 2694
		goto fail;
	*p++ = xdr_one;                             /* mark entry present */
J
J. Bruce Fields 已提交
2695 2696 2697 2698
	cookie_offset = xdr->buf->len;
	p = xdr_reserve_space(xdr, 3*4 + namlen);
	if (!p)
		goto fail;
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 */

J
J. Bruce Fields 已提交
2702
	nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
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
	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;
J
J. Bruce Fields 已提交
2721
		p = nfsd4_encode_rdattr_error(xdr, 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
	}
J
J. Bruce Fields 已提交
2727 2728 2729 2730 2731
	nfserr = nfserr_toosmall;
	entry_bytes = xdr->buf->len - start_offset;
	if (entry_bytes > cd->rd_maxcount)
		goto fail;
	cd->rd_maxcount -= entry_bytes;
J
J. Bruce Fields 已提交
2732 2733 2734
	if (!cd->rd_dircount)
		goto fail;
	cd->rd_dircount--;
J
J. Bruce Fields 已提交
2735
	cd->cookie_offset = cookie_offset;
2736
skip_entry:
L
Linus Torvalds 已提交
2737 2738 2739
	cd->common.err = nfs_ok;
	return 0;
fail:
J
J. Bruce Fields 已提交
2740
	xdr_truncate_encode(xdr, start_offset);
L
Linus Torvalds 已提交
2741 2742 2743 2744
	cd->common.err = nfserr;
	return -EINVAL;
}

2745 2746
static __be32
nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2747
{
2748
	__be32 *p;
2749

2750 2751 2752
	p = xdr_reserve_space(xdr, sizeof(stateid_t));
	if (!p)
		return nfserr_resource;
2753 2754
	WRITE32(sid->si_generation);
	WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2755
	return 0;
2756 2757
}

2758
static __be32
2759
nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
L
Linus Torvalds 已提交
2760
{
2761
	struct xdr_stream *xdr = &resp->xdr;
2762
	__be32 *p;
L
Linus Torvalds 已提交
2763 2764

	if (!nfserr) {
2765 2766 2767
		p = xdr_reserve_space(xdr, 8);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
2768 2769 2770
		WRITE32(access->ac_supported);
		WRITE32(access->ac_resp_access);
	}
2771
	return nfserr;
L
Linus Torvalds 已提交
2772 2773
}

2774 2775
static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
{
2776
	struct xdr_stream *xdr = &resp->xdr;
2777 2778 2779
	__be32 *p;

	if (!nfserr) {
2780 2781 2782
		p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
		if (!p)
			return nfserr_resource;
2783 2784
		WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
		WRITE32(bcts->dir);
2785
		/* Sorry, we do not yet support RDMA over 4.1: */
2786 2787 2788 2789 2790
		WRITE32(0);
	}
	return nfserr;
}

2791
static __be32
2792
nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
L
Linus Torvalds 已提交
2793
{
2794 2795
	struct xdr_stream *xdr = &resp->xdr;

2796
	if (!nfserr)
2797
		nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2798

2799
	return nfserr;
L
Linus Torvalds 已提交
2800 2801 2802
}


2803
static __be32
2804
nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
L
Linus Torvalds 已提交
2805
{
2806
	struct xdr_stream *xdr = &resp->xdr;
2807
	__be32 *p;
L
Linus Torvalds 已提交
2808 2809

	if (!nfserr) {
2810 2811 2812
		p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
		if (!p)
			return nfserr_resource;
2813
		WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
2814
	}
2815
	return nfserr;
L
Linus Torvalds 已提交
2816 2817
}

2818
static __be32
2819
nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
L
Linus Torvalds 已提交
2820
{
2821
	struct xdr_stream *xdr = &resp->xdr;
2822
	__be32 *p;
L
Linus Torvalds 已提交
2823 2824

	if (!nfserr) {
2825 2826 2827
		p = xdr_reserve_space(xdr, 32);
		if (!p)
			return nfserr_resource;
J
J. Bruce Fields 已提交
2828
		write_cinfo(&p, &create->cr_cinfo);
L
Linus Torvalds 已提交
2829 2830 2831 2832
		WRITE32(2);
		WRITE32(create->cr_bmval[0]);
		WRITE32(create->cr_bmval[1]);
	}
2833
	return nfserr;
L
Linus Torvalds 已提交
2834 2835
}

2836 2837
static __be32
nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
L
Linus Torvalds 已提交
2838 2839
{
	struct svc_fh *fhp = getattr->ga_fhp;
2840
	struct xdr_stream *xdr = &resp->xdr;
L
Linus Torvalds 已提交
2841 2842 2843 2844

	if (nfserr)
		return nfserr;

2845 2846
	nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
				    getattr->ga_bmval,
2847
				    resp->rqstp, 0);
L
Linus Torvalds 已提交
2848 2849 2850
	return nfserr;
}

2851 2852
static __be32
nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
L
Linus Torvalds 已提交
2853
{
2854
	struct xdr_stream *xdr = &resp->xdr;
2855
	struct svc_fh *fhp = *fhpp;
L
Linus Torvalds 已提交
2856
	unsigned int len;
2857
	__be32 *p;
L
Linus Torvalds 已提交
2858 2859 2860

	if (!nfserr) {
		len = fhp->fh_handle.fh_size;
2861 2862 2863
		p = xdr_reserve_space(xdr, len + 4);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
2864 2865 2866
		WRITE32(len);
		WRITEMEM(&fhp->fh_handle.fh_base, len);
	}
2867
	return nfserr;
L
Linus Torvalds 已提交
2868 2869 2870 2871 2872 2873
}

/*
* Including all fields other than the name, a LOCK4denied structure requires
*   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
*/
2874 2875
static __be32
nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
L
Linus Torvalds 已提交
2876
{
2877
	struct xdr_netobj *conf = &ld->ld_owner;
2878
	__be32 *p;
L
Linus Torvalds 已提交
2879

2880
again:
2881
	p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2882 2883 2884 2885 2886 2887 2888 2889 2890 2891
	if (!p) {
		/*
		 * Don't fail to return the result just because we can't
		 * return the conflicting open:
		 */
		if (conf->len) {
			conf->len = 0;
			conf->data = NULL;
			goto again;
		}
2892
		return nfserr_resource;
2893
	}
L
Linus Torvalds 已提交
2894 2895 2896
	WRITE64(ld->ld_start);
	WRITE64(ld->ld_length);
	WRITE32(ld->ld_type);
2897
	if (conf->len) {
L
Linus Torvalds 已提交
2898
		WRITEMEM(&ld->ld_clientid, 8);
2899 2900
		WRITE32(conf->len);
		WRITEMEM(conf->data, conf->len);
L
Linus Torvalds 已提交
2901 2902 2903 2904
	}  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
		WRITE64((u64)0); /* clientid */
		WRITE32(0); /* length of owner name */
	}
2905
	return nfserr_denied;
L
Linus Torvalds 已提交
2906 2907
}

2908
static __be32
2909
nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
L
Linus Torvalds 已提交
2910
{
2911 2912
	struct xdr_stream *xdr = &resp->xdr;

2913
	if (!nfserr)
2914
		nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2915
	else if (nfserr == nfserr_denied)
2916
		nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2917
	kfree(lock->lk_denied.ld_owner.data);
2918
	return nfserr;
L
Linus Torvalds 已提交
2919 2920
}

2921
static __be32
2922
nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
L
Linus Torvalds 已提交
2923
{
2924 2925
	struct xdr_stream *xdr = &resp->xdr;

L
Linus Torvalds 已提交
2926
	if (nfserr == nfserr_denied)
2927
		nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2928
	return nfserr;
L
Linus Torvalds 已提交
2929 2930
}

2931
static __be32
2932
nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
L
Linus Torvalds 已提交
2933
{
2934 2935
	struct xdr_stream *xdr = &resp->xdr;

2936
	if (!nfserr)
2937
		nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2938

2939
	return nfserr;
L
Linus Torvalds 已提交
2940 2941 2942
}


2943
static __be32
2944
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
L
Linus Torvalds 已提交
2945
{
2946
	struct xdr_stream *xdr = &resp->xdr;
2947
	__be32 *p;
L
Linus Torvalds 已提交
2948 2949

	if (!nfserr) {
2950 2951 2952
		p = xdr_reserve_space(xdr, 20);
		if (!p)
			return nfserr_resource;
J
J. Bruce Fields 已提交
2953
		write_cinfo(&p, &link->li_cinfo);
L
Linus Torvalds 已提交
2954
	}
2955
	return nfserr;
L
Linus Torvalds 已提交
2956 2957 2958
}


2959
static __be32
2960
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
L
Linus Torvalds 已提交
2961
{
2962
	struct xdr_stream *xdr = &resp->xdr;
2963
	__be32 *p;
L
Linus Torvalds 已提交
2964 2965 2966 2967

	if (nfserr)
		goto out;

2968 2969 2970 2971 2972 2973
	nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
	if (nfserr)
		goto out;
	p = xdr_reserve_space(xdr, 40);
	if (!p)
		return nfserr_resource;
J
J. Bruce Fields 已提交
2974
	write_cinfo(&p, &open->op_cinfo);
L
Linus Torvalds 已提交
2975 2976 2977 2978 2979 2980 2981 2982 2983 2984
	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:
2985 2986 2987 2988 2989 2990
		nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
		if (nfserr)
			return nfserr;
		p = xdr_reserve_space(xdr, 20);
		if (!p)
			return nfserr_resource;
2991
		WRITE32(open->op_recall);
L
Linus Torvalds 已提交
2992 2993 2994 2995 2996 2997 2998 2999 3000 3001

		/*
		 * 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:
3002 3003 3004 3005 3006 3007
		nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
		if (nfserr)
			return nfserr;
		p = xdr_reserve_space(xdr, 32);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024
		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;
3025 3026 3027 3028
	case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
		switch (open->op_why_no_deleg) {
		case WND4_CONTENTION:
		case WND4_RESOURCE:
3029 3030 3031
			p = xdr_reserve_space(xdr, 8);
			if (!p)
				return nfserr_resource;
3032 3033 3034 3035
			WRITE32(open->op_why_no_deleg);
			WRITE32(0);	/* deleg signaling not supported yet */
			break;
		default:
3036 3037 3038
			p = xdr_reserve_space(xdr, 4);
			if (!p)
				return nfserr_resource;
3039 3040 3041
			WRITE32(open->op_why_no_deleg);
		}
		break;
L
Linus Torvalds 已提交
3042 3043 3044 3045 3046
	default:
		BUG();
	}
	/* XXX save filehandle here */
out:
3047
	return nfserr;
L
Linus Torvalds 已提交
3048 3049
}

3050
static __be32
3051
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
L
Linus Torvalds 已提交
3052
{
3053 3054
	struct xdr_stream *xdr = &resp->xdr;

3055
	if (!nfserr)
3056
		nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
L
Linus Torvalds 已提交
3057

3058
	return nfserr;
L
Linus Torvalds 已提交
3059 3060
}

3061
static __be32
3062
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
L
Linus Torvalds 已提交
3063
{
3064 3065
	struct xdr_stream *xdr = &resp->xdr;

3066
	if (!nfserr)
3067
		nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
L
Linus Torvalds 已提交
3068

3069
	return nfserr;
L
Linus Torvalds 已提交
3070 3071
}

3072 3073 3074 3075
static __be32 nfsd4_encode_splice_read(
				struct nfsd4_compoundres *resp,
				struct nfsd4_read *read,
				struct file *file, unsigned long maxcount)
L
Linus Torvalds 已提交
3076
{
3077
	struct xdr_stream *xdr = &resp->xdr;
3078 3079
	u32 eof;
	int starting_len = xdr->buf->len - 8;
3080
	int space_left;
3081 3082
	__be32 nfserr;
	__be32 tmp;
3083
	__be32 *p;
L
Linus Torvalds 已提交
3084

3085 3086 3087 3088 3089
	/*
	 * Don't inline pages unless we know there's room for eof,
	 * count, and possible padding:
	 */
	if (xdr->end - xdr->p < 3)
3090
		return nfserr_resource;
3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101

	nfserr = nfsd_splice_read(read->rd_rqstp, file,
				  read->rd_offset, &maxcount);
	if (nfserr) {
		/*
		 * nfsd_splice_actor may have already messed with the
		 * page length; reset it so as not to confuse
		 * xdr_truncate_encode:
		 */
		xdr->buf->page_len = 0;
		return nfserr;
3102
	}
L
Linus Torvalds 已提交
3103

3104 3105
	eof = (read->rd_offset + maxcount >=
	       read->rd_fhp->fh_dentry->d_inode->i_size);
3106

3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125
	tmp = htonl(eof);
	write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
	tmp = htonl(maxcount);
	write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);

	resp->xdr.buf->page_len = maxcount;
	xdr->buf->len += maxcount;
	xdr->page_ptr += (maxcount + PAGE_SIZE - 1) / PAGE_SIZE;
	xdr->iov = xdr->buf->tail;

	/* Use rest of head for padding and remaining ops: */
	resp->xdr.buf->tail[0].iov_base = xdr->p;
	resp->xdr.buf->tail[0].iov_len = 0;
	if (maxcount&3) {
		p = xdr_reserve_space(xdr, 4);
		WRITE32(0);
		resp->xdr.buf->tail[0].iov_base += maxcount&3;
		resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
		xdr->buf->len -= (maxcount&3);
3126
	}
3127

3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149
	space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
				xdr->buf->buflen - xdr->buf->len);
	xdr->buf->buflen = xdr->buf->len + space_left;
	xdr->end = (__be32 *)((void *)xdr->end + space_left);

	return 0;
}

static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
				 struct nfsd4_read *read,
				 struct file *file, unsigned long maxcount)
{
	struct xdr_stream *xdr = &resp->xdr;
	u32 eof;
	int v;
	struct page *page;
	int starting_len = xdr->buf->len - 8;
	int space_left;
	long len;
	__be32 nfserr;
	__be32 tmp;
	__be32 *p;
L
Linus Torvalds 已提交
3150 3151 3152

	len = maxcount;
	v = 0;
3153 3154 3155
	while (len) {
		int thislen;

3156 3157
		page = *(resp->rqstp->rq_next_page);
		if (!page) { /* ran out of pages */
3158 3159 3160
			maxcount -= len;
			break;
		}
3161
		thislen = min_t(long, len, PAGE_SIZE);
3162
		resp->rqstp->rq_vec[v].iov_base = page_address(page);
3163
		resp->rqstp->rq_vec[v].iov_len = thislen;
3164
		resp->rqstp->rq_next_page++;
L
Linus Torvalds 已提交
3165
		v++;
3166
		len -= thislen;
L
Linus Torvalds 已提交
3167 3168 3169
	}
	read->rd_vlen = v;

3170 3171 3172
	nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
			read->rd_vlen, &maxcount);
	if (nfserr)
L
Linus Torvalds 已提交
3173
		return nfserr;
3174

3175 3176
	eof = (read->rd_offset + maxcount >=
	       read->rd_fhp->fh_dentry->d_inode->i_size);
L
Linus Torvalds 已提交
3177

3178 3179 3180 3181 3182
	tmp = htonl(eof);
	write_bytes_to_xdr_buf(xdr->buf, starting_len    , &tmp, 4);
	tmp = htonl(maxcount);
	write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);

3183
	resp->xdr.buf->page_len = maxcount;
3184
	xdr->buf->len += maxcount;
3185
	xdr->page_ptr += v;
3186
	xdr->iov = xdr->buf->tail;
L
Linus Torvalds 已提交
3187

3188
	/* Use rest of head for padding and remaining ops: */
3189
	resp->xdr.buf->tail[0].iov_base = xdr->p;
3190
	resp->xdr.buf->tail[0].iov_len = 0;
L
Linus Torvalds 已提交
3191
	if (maxcount&3) {
3192
		p = xdr_reserve_space(xdr, 4);
3193
		WRITE32(0);
3194 3195
		resp->xdr.buf->tail[0].iov_base += maxcount&3;
		resp->xdr.buf->tail[0].iov_len = 4 - (maxcount&3);
3196
		xdr->buf->len -= (maxcount&3);
L
Linus Torvalds 已提交
3197
	}
3198 3199 3200 3201 3202 3203

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

L
Linus Torvalds 已提交
3204
	return 0;
3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258

}

static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
		  struct nfsd4_read *read)
{
	unsigned long maxcount;
	struct xdr_stream *xdr = &resp->xdr;
	struct file *file = read->rd_filp;
	int starting_len = xdr->buf->len;
	struct raparms *ra;
	__be32 *p;
	__be32 err;

	if (nfserr)
		return nfserr;

	p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
	if (!p) {
		WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
		return nfserr_resource;
	}

	if (resp->xdr.buf->page_len) {
		WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
		return nfserr_resource;
	}

	xdr_commit_encode(xdr);

	maxcount = svc_max_payload(resp->rqstp);
	if (maxcount > read->rd_length)
		maxcount = read->rd_length;

	if (!read->rd_filp) {
		err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
						&file, &ra);
		if (err)
			goto err_truncate;
	}

	if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
		err = nfsd4_encode_splice_read(resp, read, file, maxcount);
	else
		err = nfsd4_encode_readv(resp, read, file, maxcount);

	if (!read->rd_filp)
		nfsd_put_tmp_read_open(file, ra);

err_truncate:
	if (err)
		xdr_truncate_encode(xdr, starting_len);
	return err;
L
Linus Torvalds 已提交
3259 3260
}

3261 3262
static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
L
Linus Torvalds 已提交
3263 3264
{
	int maxcount;
3265 3266
	__be32 wire_count;
	int zero = 0;
3267
	struct xdr_stream *xdr = &resp->xdr;
J
J. Bruce Fields 已提交
3268
	int length_offset = xdr->buf->len;
3269
	__be32 *p;
L
Linus Torvalds 已提交
3270 3271 3272

	if (nfserr)
		return nfserr;
3273 3274 3275 3276

	p = xdr_reserve_space(xdr, 4);
	if (!p)
		return nfserr_resource;
L
Linus Torvalds 已提交
3277
	maxcount = PAGE_SIZE;
3278

3279 3280
	p = xdr_reserve_space(xdr, maxcount);
	if (!p)
3281
		return nfserr_resource;
L
Linus Torvalds 已提交
3282 3283 3284 3285 3286 3287
	/*
	 * 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.
	 */
3288 3289
	nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
						(char *)p, &maxcount);
L
Linus Torvalds 已提交
3290
	if (nfserr == nfserr_isdir)
3291 3292
		nfserr = nfserr_inval;
	if (nfserr) {
J
J. Bruce Fields 已提交
3293
		xdr_truncate_encode(xdr, length_offset);
L
Linus Torvalds 已提交
3294
		return nfserr;
3295
	}
L
Linus Torvalds 已提交
3296

3297 3298 3299 3300 3301 3302
	wire_count = htonl(maxcount);
	write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
	xdr_truncate_encode(xdr, length_offset + 4 + maxcount);
	if (maxcount & 3)
		write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
						&zero, 4 - (maxcount&3));
L
Linus Torvalds 已提交
3303 3304 3305
	return 0;
}

3306 3307
static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
L
Linus Torvalds 已提交
3308 3309
{
	int maxcount;
J
J. Bruce Fields 已提交
3310
	int bytes_left;
L
Linus Torvalds 已提交
3311
	loff_t offset;
J
J. Bruce Fields 已提交
3312
	__be64 wire_offset;
3313
	struct xdr_stream *xdr = &resp->xdr;
J
J. Bruce Fields 已提交
3314
	int starting_len = xdr->buf->len;
3315
	__be32 *p;
L
Linus Torvalds 已提交
3316 3317 3318 3319

	if (nfserr)
		return nfserr;

3320 3321 3322
	p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
	if (!p)
		return nfserr_resource;
L
Linus Torvalds 已提交
3323 3324 3325 3326

	/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
	WRITE32(0);
	WRITE32(0);
3327 3328
	resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
				- (char *)resp->xdr.buf->head[0].iov_base;
L
Linus Torvalds 已提交
3329 3330

	/*
J
J. Bruce Fields 已提交
3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344
	 * Number of bytes left for directory entries allowing for the
	 * final 8 bytes of the readdir and a following failed op:
	 */
	bytes_left = xdr->buf->buflen - xdr->buf->len
			- COMPOUND_ERR_SLACK_SPACE - 8;
	if (bytes_left < 0) {
		nfserr = nfserr_resource;
		goto err_no_verf;
	}
	maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
	/*
	 * Note the rfc defines rd_maxcount as the size of the
	 * READDIR4resok structure, which includes the verifier above
	 * and the 8 bytes encoded at the end of this function:
L
Linus Torvalds 已提交
3345
	 */
J
J. Bruce Fields 已提交
3346 3347
	if (maxcount < 16) {
		nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
3348 3349
		goto err_no_verf;
	}
J
J. Bruce Fields 已提交
3350
	maxcount = min_t(int, maxcount-16, bytes_left);
L
Linus Torvalds 已提交
3351

J
J. Bruce Fields 已提交
3352 3353
	readdir->xdr = xdr;
	readdir->rd_maxcount = maxcount;
L
Linus Torvalds 已提交
3354
	readdir->common.err = 0;
J
J. Bruce Fields 已提交
3355
	readdir->cookie_offset = 0;
L
Linus Torvalds 已提交
3356 3357 3358 3359 3360 3361 3362

	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 &&
J
J. Bruce Fields 已提交
3363 3364 3365 3366 3367 3368 3369 3370 3371
	    xdr->buf->len == starting_len + 8) {
		/* nothing encoded; which limit did we hit?: */
		if (maxcount - 16 < bytes_left)
			/* It was the fault of rd_maxcount: */
			nfserr = nfserr_toosmall;
		else
			/* We ran out of buffer space: */
			nfserr = nfserr_resource;
	}
L
Linus Torvalds 已提交
3372 3373 3374
	if (nfserr)
		goto err_no_verf;

J
J. Bruce Fields 已提交
3375 3376 3377 3378 3379
	if (readdir->cookie_offset) {
		wire_offset = cpu_to_be64(offset);
		write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
							&wire_offset, 8);
	}
L
Linus Torvalds 已提交
3380

J
J. Bruce Fields 已提交
3381 3382 3383 3384 3385
	p = xdr_reserve_space(xdr, 8);
	if (!p) {
		WARN_ON_ONCE(1);
		goto err_no_verf;
	}
L
Linus Torvalds 已提交
3386 3387 3388 3389 3390
	*p++ = 0;	/* no more entries */
	*p++ = htonl(readdir->common.err == nfserr_eof);

	return 0;
err_no_verf:
J
J. Bruce Fields 已提交
3391
	xdr_truncate_encode(xdr, starting_len);
L
Linus Torvalds 已提交
3392 3393 3394
	return nfserr;
}

3395
static __be32
3396
nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
L
Linus Torvalds 已提交
3397
{
3398
	struct xdr_stream *xdr = &resp->xdr;
3399
	__be32 *p;
L
Linus Torvalds 已提交
3400 3401

	if (!nfserr) {
3402 3403 3404
		p = xdr_reserve_space(xdr, 20);
		if (!p)
			return nfserr_resource;
J
J. Bruce Fields 已提交
3405
		write_cinfo(&p, &remove->rm_cinfo);
L
Linus Torvalds 已提交
3406
	}
3407
	return nfserr;
L
Linus Torvalds 已提交
3408 3409
}

3410
static __be32
3411
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
L
Linus Torvalds 已提交
3412
{
3413
	struct xdr_stream *xdr = &resp->xdr;
3414
	__be32 *p;
L
Linus Torvalds 已提交
3415 3416

	if (!nfserr) {
3417 3418 3419
		p = xdr_reserve_space(xdr, 40);
		if (!p)
			return nfserr_resource;
J
J. Bruce Fields 已提交
3420 3421
		write_cinfo(&p, &rename->rn_sinfo);
		write_cinfo(&p, &rename->rn_tinfo);
L
Linus Torvalds 已提交
3422
	}
3423
	return nfserr;
L
Linus Torvalds 已提交
3424 3425
}

3426
static __be32
3427
nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3428
			 __be32 nfserr, struct svc_export *exp)
A
Andy Adamson 已提交
3429
{
3430
	u32 i, nflavs, supported;
3431 3432
	struct exp_flavor_info *flavs;
	struct exp_flavor_info def_flavs[2];
3433 3434
	__be32 *p, *flavorsp;
	static bool report = true;
A
Andy Adamson 已提交
3435 3436 3437

	if (nfserr)
		goto out;
3438
	nfserr = nfserr_resource;
3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458
	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;
		}
	}

3459
	supported = 0;
3460 3461 3462
	p = xdr_reserve_space(xdr, 4);
	if (!p)
		goto out;
3463 3464
	flavorsp = p++;		/* to be backfilled later */

3465
	for (i = 0; i < nflavs; i++) {
3466
		rpc_authflavor_t pf = flavs[i].pseudoflavor;
3467
		struct rpcsec_gss_info info;
A
Andy Adamson 已提交
3468

3469 3470
		if (rpcauth_get_gssinfo(pf, &info) == 0) {
			supported++;
3471 3472 3473 3474
			p = xdr_reserve_space(xdr, 4 + 4 +
					      XDR_LEN(info.oid.len) + 4 + 4);
			if (!p)
				goto out;
A
Andy Adamson 已提交
3475
			WRITE32(RPC_AUTH_GSS);
3476 3477 3478 3479
			WRITE32(info.oid.len);
			WRITEMEM(info.oid.data, info.oid.len);
			WRITE32(info.qop);
			WRITE32(info.service);
3480 3481
		} else if (pf < RPC_AUTH_MAXFLAVOR) {
			supported++;
3482 3483 3484
			p = xdr_reserve_space(xdr, 4);
			if (!p)
				goto out;
3485 3486 3487 3488 3489
			WRITE32(pf);
		} else {
			if (report)
				pr_warn("NFS: SECINFO: security flavor %u "
					"is not supported\n", pf);
A
Andy Adamson 已提交
3490 3491
		}
	}
3492

3493 3494 3495
	if (nflavs != supported)
		report = false;
	*flavorsp = htonl(supported);
3496
	nfserr = 0;
A
Andy Adamson 已提交
3497 3498 3499
out:
	if (exp)
		exp_put(exp);
3500
	return nfserr;
A
Andy Adamson 已提交
3501 3502
}

3503 3504 3505 3506
static __be32
nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
		     struct nfsd4_secinfo *secinfo)
{
3507 3508 3509
	struct xdr_stream *xdr = &resp->xdr;

	return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3510 3511 3512 3513 3514 3515
}

static __be32
nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
		     struct nfsd4_secinfo_no_name *secinfo)
{
3516 3517 3518
	struct xdr_stream *xdr = &resp->xdr;

	return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3519 3520
}

L
Linus Torvalds 已提交
3521 3522 3523 3524
/*
 * The SETATTR encode routine is special -- it always encodes a bitmap,
 * regardless of the error status.
 */
3525
static __be32
3526
nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
L
Linus Torvalds 已提交
3527
{
3528
	struct xdr_stream *xdr = &resp->xdr;
3529
	__be32 *p;
L
Linus Torvalds 已提交
3530

3531 3532 3533
	p = xdr_reserve_space(xdr, 16);
	if (!p)
		return nfserr_resource;
L
Linus Torvalds 已提交
3534
	if (nfserr) {
3535 3536
		WRITE32(3);
		WRITE32(0);
L
Linus Torvalds 已提交
3537 3538 3539 3540
		WRITE32(0);
		WRITE32(0);
	}
	else {
3541
		WRITE32(3);
L
Linus Torvalds 已提交
3542 3543
		WRITE32(setattr->sa_bmval[0]);
		WRITE32(setattr->sa_bmval[1]);
3544
		WRITE32(setattr->sa_bmval[2]);
L
Linus Torvalds 已提交
3545
	}
3546
	return nfserr;
L
Linus Torvalds 已提交
3547 3548
}

3549
static __be32
3550
nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
L
Linus Torvalds 已提交
3551
{
3552
	struct xdr_stream *xdr = &resp->xdr;
3553
	__be32 *p;
L
Linus Torvalds 已提交
3554 3555

	if (!nfserr) {
3556 3557 3558
		p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
3559
		WRITEMEM(&scd->se_clientid, 8);
3560
		WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3561 3562
	}
	else if (nfserr == nfserr_clid_inuse) {
3563 3564 3565
		p = xdr_reserve_space(xdr, 8);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
3566 3567 3568
		WRITE32(0);
		WRITE32(0);
	}
3569
	return nfserr;
L
Linus Torvalds 已提交
3570 3571
}

3572
static __be32
3573
nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
L
Linus Torvalds 已提交
3574
{
3575
	struct xdr_stream *xdr = &resp->xdr;
3576
	__be32 *p;
L
Linus Torvalds 已提交
3577 3578

	if (!nfserr) {
3579 3580 3581
		p = xdr_reserve_space(xdr, 16);
		if (!p)
			return nfserr_resource;
L
Linus Torvalds 已提交
3582 3583
		WRITE32(write->wr_bytes_written);
		WRITE32(write->wr_how_written);
3584
		WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
L
Linus Torvalds 已提交
3585
	}
3586
	return nfserr;
L
Linus Torvalds 已提交
3587 3588
}

3589 3590 3591 3592 3593 3594 3595 3596
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
3597
static __be32
J
J. Bruce Fields 已提交
3598
nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3599 3600
			 struct nfsd4_exchange_id *exid)
{
3601
	struct xdr_stream *xdr = &resp->xdr;
3602
	__be32 *p;
A
Andy Adamson 已提交
3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616
	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);

3617
	p = xdr_reserve_space(xdr,
A
Andy Adamson 已提交
3618 3619 3620
		8 /* eir_clientid */ +
		4 /* eir_sequenceid */ +
		4 /* eir_flags */ +
3621
		4 /* spr_how */);
3622 3623
	if (!p)
		return nfserr_resource;
A
Andy Adamson 已提交
3624 3625 3626 3627 3628 3629

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

	WRITE32(exid->spa_how);
3630

3631 3632 3633 3634
	switch (exid->spa_how) {
	case SP4_NONE:
		break;
	case SP4_MACH_CRED:
3635
		/* spo_must_enforce, spo_must_allow */
3636 3637 3638
		p = xdr_reserve_space(xdr, 16);
		if (!p)
			return nfserr_resource;
3639

3640 3641 3642 3643 3644 3645
		/* 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);
3646

3647 3648 3649 3650
		break;
	default:
		WARN_ON_ONCE(1);
	}
A
Andy Adamson 已提交
3651

3652
	p = xdr_reserve_space(xdr,
3653 3654 3655 3656 3657 3658
		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) */);
3659 3660
	if (!p)
		return nfserr_resource;
3661

A
Andy Adamson 已提交
3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674
	/* 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
3675 3676 3677
}

static __be32
J
J. Bruce Fields 已提交
3678
nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3679 3680
			    struct nfsd4_create_session *sess)
{
3681
	struct xdr_stream *xdr = &resp->xdr;
3682
	__be32 *p;
A
Andy Adamson 已提交
3683 3684 3685 3686

	if (nfserr)
		return nfserr;

3687 3688 3689
	p = xdr_reserve_space(xdr, 24);
	if (!p)
		return nfserr_resource;
A
Andy Adamson 已提交
3690 3691 3692 3693
	WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
	WRITE32(sess->seqid);
	WRITE32(sess->flags);

3694 3695 3696
	p = xdr_reserve_space(xdr, 28);
	if (!p)
		return nfserr_resource;
A
Andy Adamson 已提交
3697 3698 3699 3700 3701 3702 3703 3704 3705
	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) {
3706 3707 3708
		p = xdr_reserve_space(xdr, 4);
		if (!p)
			return nfserr_resource;
A
Andy Adamson 已提交
3709 3710 3711
		WRITE32(sess->fore_channel.rdma_attrs);
	}

3712 3713 3714
	p = xdr_reserve_space(xdr, 28);
	if (!p)
		return nfserr_resource;
A
Andy Adamson 已提交
3715 3716 3717 3718 3719 3720 3721 3722 3723
	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) {
3724 3725 3726
		p = xdr_reserve_space(xdr, 4);
		if (!p)
			return nfserr_resource;
A
Andy Adamson 已提交
3727 3728 3729
		WRITE32(sess->back_channel.rdma_attrs);
	}
	return 0;
A
Andy Adamson 已提交
3730 3731
}

D
Daniel Mack 已提交
3732
static __be32
J
J. Bruce Fields 已提交
3733
nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
3734 3735
		      struct nfsd4_sequence *seq)
{
3736
	struct xdr_stream *xdr = &resp->xdr;
3737
	__be32 *p;
B
Benny Halevy 已提交
3738 3739 3740 3741

	if (nfserr)
		return nfserr;

3742 3743 3744
	p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
	if (!p)
		return nfserr_resource;
B
Benny Halevy 已提交
3745 3746 3747
	WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
	WRITE32(seq->seqid);
	WRITE32(seq->slotid);
3748 3749 3750
	/* Note slotid's are numbered from zero: */
	WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
	WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3751
	WRITE32(seq->status_flags);
B
Benny Halevy 已提交
3752

3753
	resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
B
Benny Halevy 已提交
3754
	return 0;
A
Andy Adamson 已提交
3755 3756
}

J
J. Bruce Fields 已提交
3757
static __be32
J
J. Bruce Fields 已提交
3758
nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3759 3760
			  struct nfsd4_test_stateid *test_stateid)
{
3761
	struct xdr_stream *xdr = &resp->xdr;
3762
	struct nfsd4_test_stateid_id *stateid, *next;
3763 3764
	__be32 *p;

3765 3766 3767
	if (nfserr)
		return nfserr;

3768 3769 3770
	p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
	if (!p)
		return nfserr_resource;
3771 3772
	*p++ = htonl(test_stateid->ts_num_ids);

3773
	list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3774
		*p++ = stateid->ts_id_status;
3775 3776 3777 3778 3779
	}

	return nfserr;
}

3780 3781 3782 3783 3784 3785 3786 3787
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
3788 3789 3790 3791 3792
/*
 * 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.
 */
3793
static nfsd4_enc nfsd4_enc_ops[] = {
3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809
	[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,
3810
	[OP_OPENATTR]		= (nfsd4_enc)nfsd4_encode_noop,
3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830
	[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
3831 3832 3833

	/* NFSv4.1 operations */
	[OP_BACKCHANNEL_CTL]	= (nfsd4_enc)nfsd4_encode_noop,
3834
	[OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
A
Andy Adamson 已提交
3835 3836
	[OP_EXCHANGE_ID]	= (nfsd4_enc)nfsd4_encode_exchange_id,
	[OP_CREATE_SESSION]	= (nfsd4_enc)nfsd4_encode_create_session,
3837 3838
	[OP_DESTROY_SESSION]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_FREE_STATEID]	= (nfsd4_enc)nfsd4_encode_noop,
A
Andy Adamson 已提交
3839 3840 3841 3842 3843 3844
	[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,
3845
	[OP_SECINFO_NO_NAME]	= (nfsd4_enc)nfsd4_encode_secinfo_no_name,
A
Andy Adamson 已提交
3846 3847
	[OP_SEQUENCE]		= (nfsd4_enc)nfsd4_encode_sequence,
	[OP_SET_SSV]		= (nfsd4_enc)nfsd4_encode_noop,
3848
	[OP_TEST_STATEID]	= (nfsd4_enc)nfsd4_encode_test_stateid,
A
Andy Adamson 已提交
3849 3850 3851
	[OP_WANT_DELEGATION]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_DESTROY_CLIENTID]	= (nfsd4_enc)nfsd4_encode_noop,
	[OP_RECLAIM_COMPLETE]	= (nfsd4_enc)nfsd4_encode_noop,
3852 3853
};

3854
/*
J
J. Bruce Fields 已提交
3855 3856 3857 3858 3859 3860
 * Calculate whether we still have space to encode repsize bytes.
 * There are two considerations:
 *     - For NFS versions >=4.1, the size of the reply must stay within
 *       session limits
 *     - For all NFS versions, we must stay within limited preallocated
 *       buffer space.
3861
 *
J
J. Bruce Fields 已提交
3862 3863 3864 3865
 * This is called before the operation is processed, so can only provide
 * an upper estimate.  For some nonidempotent operations (such as
 * getattr), it's not necessarily a problem if that estimate is wrong,
 * as we can fail it after processing without significant side effects.
3866
 */
J
J. Bruce Fields 已提交
3867
__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3868
{
3869
	struct xdr_buf *buf = &resp->rqstp->rq_res;
3870
	struct nfsd4_slot *slot = resp->cstate.slot;
3871

3872 3873 3874
	if (buf->len + respsize <= buf->buflen)
		return nfs_ok;
	if (!nfsd4_has_session(&resp->cstate))
3875
		return nfserr_resource;
3876 3877 3878
	if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
		WARN_ON_ONCE(1);
		return nfserr_rep_too_big_to_cache;
3879
	}
3880
	return nfserr_rep_too_big;
3881 3882
}

L
Linus Torvalds 已提交
3883 3884 3885
void
nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
3886
	struct xdr_stream *xdr = &resp->xdr;
3887
	struct nfs4_stateowner *so = resp->cstate.replay_owner;
3888
	struct svc_rqst *rqstp = resp->rqstp;
3889
	int post_err_offset;
3890
	nfsd4_enc encoder;
3891
	__be32 *p;
L
Linus Torvalds 已提交
3892

3893 3894 3895 3896 3897
	p = xdr_reserve_space(xdr, 8);
	if (!p) {
		WARN_ON_ONCE(1);
		return;
	}
L
Linus Torvalds 已提交
3898
	WRITE32(op->opnum);
3899
	post_err_offset = xdr->buf->len;
L
Linus Torvalds 已提交
3900

3901 3902 3903 3904
	if (op->opnum == OP_ILLEGAL)
		goto status;
	BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
	       !nfsd4_enc_ops[op->opnum]);
3905 3906
	encoder = nfsd4_enc_ops[op->opnum];
	op->status = encoder(resp, op->status, &op->u);
3907 3908
	xdr_commit_encode(xdr);

3909
	/* nfsd4_check_resp_size guarantees enough room for error status */
3910 3911 3912 3913 3914 3915
	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);
	}
3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926
	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);
3927
		xdr_truncate_encode(xdr, post_err_offset);
3928
	}
3929
	if (so) {
3930 3931
		int len = xdr->buf->len - post_err_offset;

3932
		so->so_replay.rp_status = op->status;
3933 3934 3935
		so->so_replay.rp_buflen = len;
		read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
						so->so_replay.rp_buf, len);
3936
	}
3937
status:
3938 3939
	/* Note that op->status is already in network byte order: */
	write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
L
Linus Torvalds 已提交
3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950
}

/* 
 * 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
3951
nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
L
Linus Torvalds 已提交
3952
{
3953
	__be32 *p;
L
Linus Torvalds 已提交
3954 3955 3956 3957
	struct nfs4_replay *rp = op->replay;

	BUG_ON(!rp);

3958 3959 3960 3961 3962
	p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
	if (!p) {
		WARN_ON_ONCE(1);
		return;
	}
L
Linus Torvalds 已提交
3963 3964 3965 3966 3967 3968 3969
	WRITE32(op->opnum);
	*p++ = rp->rp_status;  /* already xdr'ed */

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

int
A
Al Viro 已提交
3970
nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
L
Linus Torvalds 已提交
3971 3972 3973 3974
{
        return xdr_ressize_check(rqstp, p);
}

3975
int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
L
Linus Torvalds 已提交
3976
{
3977 3978 3979
	struct svc_rqst *rqstp = rq;
	struct nfsd4_compoundargs *args = rqstp->rq_argp;

L
Linus Torvalds 已提交
3980 3981 3982 3983
	if (args->ops != args->iops) {
		kfree(args->ops);
		args->ops = args->iops;
	}
J
Jesper Juhl 已提交
3984 3985
	kfree(args->tmpp);
	args->tmpp = NULL;
L
Linus Torvalds 已提交
3986 3987 3988 3989 3990 3991
	while (args->to_free) {
		struct tmpbuf *tb = args->to_free;
		args->to_free = tb->next;
		tb->release(tb->buf);
		kfree(tb);
	}
3992
	return 1;
L
Linus Torvalds 已提交
3993 3994 3995
}

int
A
Al Viro 已提交
3996
nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
L
Linus Torvalds 已提交
3997
{
3998 3999 4000 4001 4002 4003
	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
4004 4005 4006 4007 4008 4009 4010 4011 4012
	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;

4013
	return !nfsd4_decode_compound(args);
L
Linus Torvalds 已提交
4014 4015 4016
}

int
A
Al Viro 已提交
4017
nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
L
Linus Torvalds 已提交
4018 4019 4020 4021
{
	/*
	 * All that remains is to write the tag and operation count...
	 */
4022
	struct nfsd4_compound_state *cs = &resp->cstate;
4023 4024 4025 4026
	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);
4027

4028 4029
	rqstp->rq_next_page = resp->xdr.page_ptr + 1;

L
Linus Torvalds 已提交
4030 4031 4032 4033 4034 4035
	p = resp->tagp;
	*p++ = htonl(resp->taglen);
	memcpy(p, resp->tag, resp->taglen);
	p += XDR_QUADLEN(resp->taglen);
	*p++ = htonl(resp->opcnt);

4036
	if (nfsd4_has_session(cs)) {
4037 4038
		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
		struct nfs4_client *clp = cs->session->se_client;
4039 4040
		if (cs->status != nfserr_replay_cache) {
			nfsd4_store_cache_entry(resp);
4041
			cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4042
		}
4043
		/* Renew the clientid on success and on replay */
4044
		spin_lock(&nn->client_lock);
4045
		nfsd4_put_session(cs->session);
4046 4047
		spin_unlock(&nn->client_lock);
		put_client_renew(clp);
A
Andy Adamson 已提交
4048
	}
L
Linus Torvalds 已提交
4049 4050 4051 4052 4053 4054 4055 4056
	return 1;
}

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