nfs4xdr.c 69.0 KB
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/*
 *  fs/nfs/nfs4xdr.c
 *
 *  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.
 */

#include <linux/param.h>
#include <linux/smp.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/vfs.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/state.h>
#include <linux/nfsd/xdr4.h>
#include <linux/nfsd_idmap.h>
#include <linux/nfs4.h>
#include <linux/nfs4_acl.h>
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#include <linux/sunrpc/gss_api.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#define NFSDDBG_FACILITY		NFSDDBG_XDR

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

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

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

/*
 * START OF "GENERIC" DECODE ROUTINES.
 *   These may look a little ugly since they are imported from a "generic"
 * set of XDR encode/decode routines which are intended to be shared by
 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
 *
 * If the pain of reading these is too great, it should be a straightforward
 * task to translate them into Linux-specific versions which are more
 * consistent with the style used in NFSv2/v3...
 */
#define DECODE_HEAD				\
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	__be32 *p;				\
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	__be32 status
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#define DECODE_TAIL				\
	status = 0;				\
out:						\
	return status;				\
xdr_error:					\
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	dprintk("NFSD: xdr error (%s:%d)\n",	\
			__FILE__, __LINE__);	\
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	status = nfserr_bad_xdr;		\
	goto out

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

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

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

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

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

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static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
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{
	if (p == argp->tmp) {
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		p = kmalloc(nbytes, GFP_KERNEL);
		if (!p)
			return NULL;
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		memcpy(p, argp->tmp, nbytes);
	} 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;

	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]);

	DECODE_TAIL;
}

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

	/*
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	 * According to spec, unsupported attributes return ERR_ATTRNOTSUPP;
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	 * read-only attributes return ERR_INVAL.
	 */
	if ((bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0) || (bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
		return nfserr_attrnotsupp;
	if ((bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0) || (bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1))
		return nfserr_inval;

	READ_BUF(4);
	READ32(expected_len);

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

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		if (nace > NFS4_ACL_MAX)
			return nfserr_resource;

		*acl = nfs4_acl_new(nace);
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		if (*acl == NULL) {
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			host_err = -ENOMEM;
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			goto out_nfserr;
		}
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		defer_free(argp, kfree, *acl);
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		(*acl)->naces = nace;
		for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
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			READ_BUF(16); len += 16;
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			READ32(ace->type);
			READ32(ace->flag);
			READ32(ace->access_mask);
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			READ32(dummy32);
			READ_BUF(dummy32);
			len += XDR_QUADLEN(dummy32) << 2;
			READMEM(buf, dummy32);
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			ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
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			host_err = 0;
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			if (ace->whotype != NFS4_ACL_WHO_NAMED)
				ace->who = 0;
			else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
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				host_err = nfsd_map_name_to_gid(argp->rqstp,
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						buf, dummy32, &ace->who);
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			else
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				host_err = nfsd_map_name_to_uid(argp->rqstp,
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						buf, dummy32, &ace->who);
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			if (host_err)
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				goto out_nfserr;
		}
	} 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 ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
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			goto out_nfserr;
		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 ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
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			goto out_nfserr;
		iattr->ia_valid |= ATTR_GID;
	}
	if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		switch (dummy32) {
		case NFS4_SET_TO_CLIENT_TIME:
			/* We require the high 32 bits of 'seconds' to be 0, and we ignore
			   all 32 bits of 'nseconds'. */
			READ_BUF(12);
			len += 12;
			READ32(dummy32);
			if (dummy32)
				return nfserr_inval;
			READ32(iattr->ia_atime.tv_sec);
			READ32(iattr->ia_atime.tv_nsec);
			if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
				return nfserr_inval;
			iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
			break;
		case NFS4_SET_TO_SERVER_TIME:
			iattr->ia_valid |= ATTR_ATIME;
			break;
		default:
			goto xdr_error;
		}
	}
	if (bmval[1] & FATTR4_WORD1_TIME_METADATA) {
		/* We require the high 32 bits of 'seconds' to be 0, and we ignore
		   all 32 bits of 'nseconds'. */
		READ_BUF(12);
		len += 12;
		READ32(dummy32);
		if (dummy32)
			return nfserr_inval;
		READ32(iattr->ia_ctime.tv_sec);
		READ32(iattr->ia_ctime.tv_nsec);
		if (iattr->ia_ctime.tv_nsec >= (u32)1000000000)
			return nfserr_inval;
		iattr->ia_valid |= ATTR_CTIME;
	}
	if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
		READ_BUF(4);
		len += 4;
		READ32(dummy32);
		switch (dummy32) {
		case NFS4_SET_TO_CLIENT_TIME:
			/* We require the high 32 bits of 'seconds' to be 0, and we ignore
			   all 32 bits of 'nseconds'. */
			READ_BUF(12);
			len += 12;
			READ32(dummy32);
			if (dummy32)
				return nfserr_inval;
			READ32(iattr->ia_mtime.tv_sec);
			READ32(iattr->ia_mtime.tv_nsec);
			if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
				return nfserr_inval;
			iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
			break;
		case NFS4_SET_TO_SERVER_TIME:
			iattr->ia_valid |= ATTR_MTIME;
			break;
		default:
			goto xdr_error;
		}
	}
	if (len != expected_len)
		goto xdr_error;

	DECODE_TAIL;

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

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

	close->cl_stateowner = NULL;
	READ_BUF(4 + sizeof(stateid_t));
	READ32(close->cl_seqid);
	READ32(close->cl_stateid.si_generation);
	COPYMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));

	DECODE_TAIL;
}


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

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

	DECODE_TAIL;
}

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

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

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

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

	DECODE_TAIL;
}

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static inline __be32
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nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

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static inline __be32
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nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
{
	return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
}

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static __be32
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nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

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static __be32
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nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
{
	DECODE_HEAD;

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	lock->lk_replay_owner = NULL;
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	/*
	* 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) {
		READ_BUF(36);
		READ32(lock->lk_new_open_seqid);
		READ32(lock->lk_new_open_stateid.si_generation);

		COPYMEM(&lock->lk_new_open_stateid.si_opaque, sizeof(stateid_opaque_t));
		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 {
		READ_BUF(20);
		READ32(lock->lk_old_lock_stateid.si_generation);
		COPYMEM(&lock->lk_old_lock_stateid.si_opaque, sizeof(stateid_opaque_t));
		READ32(lock->lk_old_lock_seqid);
	}

	DECODE_TAIL;
}

579
static __be32
L
Linus Torvalds 已提交
580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597
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;
}

598
static __be32
L
Linus Torvalds 已提交
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616
nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
{
	DECODE_HEAD;

	locku->lu_stateowner = NULL;
	READ_BUF(24 + sizeof(stateid_t));
	READ32(locku->lu_type);
	if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
		goto xdr_error;
	READ32(locku->lu_seqid);
	READ32(locku->lu_stateid.si_generation);
	COPYMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
	READ64(locku->lu_offset);
	READ64(locku->lu_length);

	DECODE_TAIL;
}

617
static __be32
L
Linus Torvalds 已提交
618 619 620 621 622 623 624 625 626 627 628 629 630 631
nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

632
static __be32
L
Linus Torvalds 已提交
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709
nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
{
	DECODE_HEAD;

	memset(open->op_bmval, 0, sizeof(open->op_bmval));
	open->op_iattr.ia_valid = 0;
	open->op_stateowner = NULL;

	/* seqid, share_access, share_deny, clientid, ownerlen */
	READ_BUF(16 + sizeof(clientid_t));
	READ32(open->op_seqid);
	READ32(open->op_share_access);
	READ32(open->op_share_deny);
	COPYMEM(&open->op_clientid, sizeof(clientid_t));
	READ32(open->op_owner.len);

	/* owner, open_flag */
	READ_BUF(open->op_owner.len + 4);
	SAVEMEM(open->op_owner.data, open->op_owner.len);
	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:
			if ((status = nfsd4_decode_fattr(argp, open->op_bmval, &open->op_iattr, &open->op_acl)))
				goto out;
			break;
		case NFS4_CREATE_EXCLUSIVE:
			READ_BUF(8);
			COPYMEM(open->op_verf.data, 8);
			break;
		default:
			goto xdr_error;
		}
		break;
	default:
		goto xdr_error;
	}

	/* open_claim */
	READ_BUF(4);
	READ32(open->op_claim_type);
	switch (open->op_claim_type) {
	case NFS4_OPEN_CLAIM_NULL:
	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
		READ_BUF(4);
		READ32(open->op_fname.len);
		READ_BUF(open->op_fname.len);
		SAVEMEM(open->op_fname.data, open->op_fname.len);
		if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
			return status;
		break;
	case NFS4_OPEN_CLAIM_PREVIOUS:
		READ_BUF(4);
		READ32(open->op_delegate_type);
		break;
	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
		READ_BUF(sizeof(stateid_t) + 4);
		COPYMEM(&open->op_delegate_stateid, sizeof(stateid_t));
		READ32(open->op_fname.len);
		READ_BUF(open->op_fname.len);
		SAVEMEM(open->op_fname.data, open->op_fname.len);
		if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
			return status;
		break;
	default:
		goto xdr_error;
	}

	DECODE_TAIL;
}

710
static __be32
L
Linus Torvalds 已提交
711 712 713 714 715 716 717 718 719 720 721 722 723
nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
{
	DECODE_HEAD;
		    
	open_conf->oc_stateowner = NULL;
	READ_BUF(4 + sizeof(stateid_t));
	READ32(open_conf->oc_req_stateid.si_generation);
	COPYMEM(&open_conf->oc_req_stateid.si_opaque, sizeof(stateid_opaque_t));
	READ32(open_conf->oc_seqid);
						        
	DECODE_TAIL;
}

724
static __be32
L
Linus Torvalds 已提交
725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
{
	DECODE_HEAD;
		    
	open_down->od_stateowner = NULL;
	READ_BUF(12 + sizeof(stateid_t));
	READ32(open_down->od_stateid.si_generation);
	COPYMEM(&open_down->od_stateid.si_opaque, sizeof(stateid_opaque_t));
	READ32(open_down->od_seqid);
	READ32(open_down->od_share_access);
	READ32(open_down->od_share_deny);
						        
	DECODE_TAIL;
}

740
static __be32
L
Linus Torvalds 已提交
741 742 743 744 745 746 747 748 749 750 751 752 753 754
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;
}

755
static __be32
L
Linus Torvalds 已提交
756 757 758 759 760 761 762 763 764 765 766 767 768
nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
{
	DECODE_HEAD;

	READ_BUF(sizeof(stateid_t) + 12);
	READ32(read->rd_stateid.si_generation);
	COPYMEM(&read->rd_stateid.si_opaque, sizeof(stateid_opaque_t));
	READ64(read->rd_offset);
	READ32(read->rd_length);

	DECODE_TAIL;
}

769
static __be32
L
Linus Torvalds 已提交
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784
nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

785
static __be32
L
Linus Torvalds 已提交
786 787 788 789 790 791 792 793 794 795 796 797 798 799
nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

800
static __be32
L
Linus Torvalds 已提交
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

820
static __be32
L
Linus Torvalds 已提交
821 822 823 824 825 826 827 828 829 830
nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

A
Andy Adamson 已提交
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847
static __be32
nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
		     struct nfsd4_secinfo *secinfo)
{
	DECODE_HEAD;

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

848
static __be32
L
Linus Torvalds 已提交
849 850 851 852 853 854 855 856 857 858 859 860 861
nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
{
	DECODE_HEAD;

	READ_BUF(sizeof(stateid_t));
	READ32(setattr->sa_stateid.si_generation);
	COPYMEM(&setattr->sa_stateid.si_opaque, sizeof(stateid_opaque_t));
	if ((status = nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr, &setattr->sa_acl)))
		goto out;

	DECODE_TAIL;
}

862
static __be32
L
Linus Torvalds 已提交
863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886
nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
{
	DECODE_HEAD;

	READ_BUF(12);
	COPYMEM(setclientid->se_verf.data, 8);
	READ32(setclientid->se_namelen);

	READ_BUF(setclientid->se_namelen + 8);
	SAVEMEM(setclientid->se_name, setclientid->se_namelen);
	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;
}

887
static __be32
L
Linus Torvalds 已提交
888 889 890 891 892 893 894 895 896 897 898 899
nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
{
	DECODE_HEAD;

	READ_BUF(8 + sizeof(nfs4_verifier));
	COPYMEM(&scd_c->sc_clientid, 8);
	COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));

	DECODE_TAIL;
}

/* Also used for NVERIFY */
900
static __be32
L
Linus Torvalds 已提交
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935
nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
{
#if 0
	struct nfsd4_compoundargs save = {
		.p = argp->p,
		.end = argp->end,
		.rqstp = argp->rqstp,
	};
	u32             ve_bmval[2];
	struct iattr    ve_iattr;           /* request */
	struct nfs4_acl *ve_acl;            /* request */
#endif
	DECODE_HEAD;

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

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

	DECODE_TAIL;
}

936
static __be32
L
Linus Torvalds 已提交
937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958
nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
{
	int avail;
	int v;
	int len;
	DECODE_HEAD;

	READ_BUF(sizeof(stateid_opaque_t) + 20);
	READ32(write->wr_stateid.si_generation);
	COPYMEM(&write->wr_stateid.si_opaque, sizeof(stateid_opaque_t));
	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) {
959 960
		dprintk("NFSD: xdr error (%s:%d)\n",
				__FILE__, __LINE__);
L
Linus Torvalds 已提交
961 962
		goto xdr_error;
	}
963 964
	argp->rqstp->rq_vec[0].iov_base = p;
	argp->rqstp->rq_vec[0].iov_len = avail;
L
Linus Torvalds 已提交
965 966
	v = 0;
	len = write->wr_buflen;
967 968
	while (len > argp->rqstp->rq_vec[v].iov_len) {
		len -= argp->rqstp->rq_vec[v].iov_len;
L
Linus Torvalds 已提交
969
		v++;
970
		argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
L
Linus Torvalds 已提交
971 972
		argp->pagelist++;
		if (argp->pagelen >= PAGE_SIZE) {
973
			argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
L
Linus Torvalds 已提交
974 975
			argp->pagelen -= PAGE_SIZE;
		} else {
976
			argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
L
Linus Torvalds 已提交
977 978 979
			argp->pagelen -= len;
		}
	}
A
Al Viro 已提交
980 981
	argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
	argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
982
	argp->rqstp->rq_vec[v].iov_len = len;
L
Linus Torvalds 已提交
983 984 985 986 987
	write->wr_vlen = v+1;

	DECODE_TAIL;
}

988
static __be32
L
Linus Torvalds 已提交
989 990 991 992 993 994 995 996 997 998 999 1000 1001
nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
{
	DECODE_HEAD;

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

	DECODE_TAIL;
}

1002
static __be32
L
Linus Torvalds 已提交
1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
{
	DECODE_HEAD;
	struct nfsd4_op *op;
	int i;

	/*
	 * XXX: According to spec, we should check the tag
	 * for UTF-8 compliance.  I'm postponing this for
	 * now because it seems that some clients do use
	 * binary tags.
	 */
	READ_BUF(4);
	READ32(argp->taglen);
	READ_BUF(argp->taglen + 8);
	SAVEMEM(argp->tag, argp->taglen);
	READ32(argp->minorversion);
	READ32(argp->opcnt);

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

1027
	if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
L
Linus Torvalds 已提交
1028 1029 1030
		argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
		if (!argp->ops) {
			argp->ops = argp->iops;
1031
			dprintk("nfsd: couldn't allocate room for COMPOUND\n");
L
Linus Torvalds 已提交
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
			goto xdr_error;
		}
	}

	for (i = 0; i < argp->opcnt; i++) {
		op = &argp->ops[i];
		op->replay = NULL;

		/*
		 * We can't use READ_BUF() here because we need to handle
		 * a missing opcode as an OP_WRITE + 1. So we need to check
		 * to see if we're truly at the end of our buffer or if there
		 * is another page we need to flip to.
		 */

		if (argp->p == argp->end) {
			if (argp->pagelen < 4) {
				/* There isn't an opcode still on the wire */
				op->opnum = OP_WRITE + 1;
				op->status = nfserr_bad_xdr;
				argp->opcnt = i+1;
				break;
			}

			/*
			 * False alarm. We just hit a page boundary, but there
			 * is still data available.  Move pointer across page
			 * boundary.  *snip from READ_BUF*
			 */
			argp->p = page_address(argp->pagelist[0]);
			argp->pagelist++;
			if (argp->pagelen < PAGE_SIZE) {
				argp->end = p + (argp->pagelen>>2);
				argp->pagelen = 0;
			} else {
				argp->end = p + (PAGE_SIZE>>2);
				argp->pagelen -= PAGE_SIZE;
			}
		}
		op->opnum = ntohl(*argp->p++);

		switch (op->opnum) {
		case 2: /* Reserved operation */
			op->opnum = OP_ILLEGAL;
			if (argp->minorversion == 0)
				op->status = nfserr_op_illegal;
			else
				op->status = nfserr_minor_vers_mismatch;
			break;
		case OP_ACCESS:
			op->status = nfsd4_decode_access(argp, &op->u.access);
			break;
		case OP_CLOSE:
			op->status = nfsd4_decode_close(argp, &op->u.close);
			break;
		case OP_COMMIT:
			op->status = nfsd4_decode_commit(argp, &op->u.commit);
			break;
		case OP_CREATE:
			op->status = nfsd4_decode_create(argp, &op->u.create);
			break;
		case OP_DELEGRETURN:
			op->status = nfsd4_decode_delegreturn(argp, &op->u.delegreturn);
			break;
		case OP_GETATTR:
			op->status = nfsd4_decode_getattr(argp, &op->u.getattr);
			break;
		case OP_GETFH:
			op->status = nfs_ok;
			break;
		case OP_LINK:
			op->status = nfsd4_decode_link(argp, &op->u.link);
			break;
		case OP_LOCK:
			op->status = nfsd4_decode_lock(argp, &op->u.lock);
			break;
		case OP_LOCKT:
			op->status = nfsd4_decode_lockt(argp, &op->u.lockt);
			break;
		case OP_LOCKU:
			op->status = nfsd4_decode_locku(argp, &op->u.locku);
			break;
		case OP_LOOKUP:
			op->status = nfsd4_decode_lookup(argp, &op->u.lookup);
			break;
		case OP_LOOKUPP:
			op->status = nfs_ok;
			break;
		case OP_NVERIFY:
			op->status = nfsd4_decode_verify(argp, &op->u.nverify);
			break;
		case OP_OPEN:
			op->status = nfsd4_decode_open(argp, &op->u.open);
			break;
		case OP_OPEN_CONFIRM:
			op->status = nfsd4_decode_open_confirm(argp, &op->u.open_confirm);
			break;
		case OP_OPEN_DOWNGRADE:
			op->status = nfsd4_decode_open_downgrade(argp, &op->u.open_downgrade);
			break;
		case OP_PUTFH:
			op->status = nfsd4_decode_putfh(argp, &op->u.putfh);
			break;
		case OP_PUTROOTFH:
			op->status = nfs_ok;
			break;
		case OP_READ:
			op->status = nfsd4_decode_read(argp, &op->u.read);
			break;
		case OP_READDIR:
			op->status = nfsd4_decode_readdir(argp, &op->u.readdir);
			break;
		case OP_READLINK:
			op->status = nfs_ok;
			break;
		case OP_REMOVE:
			op->status = nfsd4_decode_remove(argp, &op->u.remove);
			break;
		case OP_RENAME:
			op->status = nfsd4_decode_rename(argp, &op->u.rename);
			break;
		case OP_RESTOREFH:
			op->status = nfs_ok;
			break;
		case OP_RENEW:
			op->status = nfsd4_decode_renew(argp, &op->u.renew);
			break;
		case OP_SAVEFH:
			op->status = nfs_ok;
			break;
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Andy Adamson 已提交
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		case OP_SECINFO:
			op->status = nfsd4_decode_secinfo(argp, &op->u.secinfo);
			break;
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		case OP_SETATTR:
			op->status = nfsd4_decode_setattr(argp, &op->u.setattr);
			break;
		case OP_SETCLIENTID:
			op->status = nfsd4_decode_setclientid(argp, &op->u.setclientid);
			break;
		case OP_SETCLIENTID_CONFIRM:
			op->status = nfsd4_decode_setclientid_confirm(argp, &op->u.setclientid_confirm);
			break;
		case OP_VERIFY:
			op->status = nfsd4_decode_verify(argp, &op->u.verify);
			break;
		case OP_WRITE:
			op->status = nfsd4_decode_write(argp, &op->u.write);
			break;
		case OP_RELEASE_LOCKOWNER:
			op->status = nfsd4_decode_release_lockowner(argp, &op->u.release_lockowner);
			break;
		default:
			op->opnum = OP_ILLEGAL;
			op->status = nfserr_op_illegal;
			break;
		}

		if (op->status) {
			argp->opcnt = i+1;
			break;
		}
	}

	DECODE_TAIL;
}
/*
 * END OF "GENERIC" DECODE ROUTINES.
 */

/*
 * START OF "GENERIC" ENCODE ROUTINES.
 *   These may look a little ugly since they are imported from a "generic"
 * set of XDR encode/decode routines which are intended to be shared by
 * all of our NFSv4 implementations (OpenBSD, MacOS X...).
 *
 * If the pain of reading these is too great, it should be a straightforward
 * task to translate them into Linux-specific versions which are more
 * consistent with the style used in NFSv2/v3...
 */
A
Al Viro 已提交
1211
#define ENCODE_HEAD              __be32 *p
L
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1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240

#define WRITE32(n)               *p++ = htonl(n)
#define WRITE64(n)               do {				\
	*p++ = htonl((u32)((n) >> 32));				\
	*p++ = htonl((u32)(n));					\
} while (0)
#define WRITEMEM(ptr,nbytes)     do {				\
	*(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
	memcpy(p, ptr, nbytes);					\
	p += XDR_QUADLEN(nbytes);				\
} while (0)
#define WRITECINFO(c)		do {				\
	*p++ = htonl(c.atomic);					\
	*p++ = htonl(c.before_ctime_sec);				\
	*p++ = htonl(c.before_ctime_nsec);				\
	*p++ = htonl(c.after_ctime_sec);				\
	*p++ = htonl(c.after_ctime_nsec);				\
} while (0)

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

/*
 * Header routine to setup seqid operation replay cache
 */
#define ENCODE_SEQID_OP_HEAD					\
A
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	__be32 *p;						\
	__be32 *save;						\
L
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1243 1244 1245 1246
								\
	save = resp->p;

/*
N
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1247 1248 1249 1250
 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
 * is where sequence id's are incremented, and the replay cache is filled.
 * Note that we increment sequence id's here, at the last moment, so we're sure
 * we know whether the error to be returned is a sequence id mutating error.
L
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 */

#define ENCODE_SEQID_OP_TAIL(stateowner) do {			\
	if (seqid_mutating_err(nfserr) && stateowner) { 	\
1255
		stateowner->so_seqid++;				\
L
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		stateowner->so_replay.rp_status = nfserr;   	\
		stateowner->so_replay.rp_buflen = 		\
			  (((char *)(resp)->p - (char *)save)); \
		memcpy(stateowner->so_replay.rp_buf, save,      \
 			stateowner->so_replay.rp_buflen); 	\
	} } while (0);

1263 1264 1265
/* Encode as an array of strings the string given with components
 * seperated @sep.
 */
1266
static __be32 nfsd4_encode_components(char sep, char *components,
A
Al Viro 已提交
1267
				   __be32 **pp, int *buflen)
1268
{
A
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1269 1270
	__be32 *p = *pp;
	__be32 *countp = p;
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	int strlen, count=0;
	char *str, *end;

	dprintk("nfsd4_encode_components(%s)\n", components);
	if ((*buflen -= 4) < 0)
		return nfserr_resource;
	WRITE32(0); /* We will fill this in with @count later */
	end = str = components;
	while (*end) {
		for (; *end && (*end != sep); end++)
			; /* Point to end of component */
		strlen = end - str;
		if (strlen) {
			if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
				return nfserr_resource;
			WRITE32(strlen);
			WRITEMEM(str, strlen);
			count++;
		}
		else
			end++;
		str = end;
	}
	*pp = p;
	p = countp;
	WRITE32(count);
	return 0;
}

/*
 * encode a location element of a fs_locations structure
 */
1303
static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
A
Al Viro 已提交
1304
				    __be32 **pp, int *buflen)
1305
{
1306
	__be32 status;
A
Al Viro 已提交
1307
	__be32 *p = *pp;
1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323

	status = nfsd4_encode_components(':', location->hosts, &p, buflen);
	if (status)
		return status;
	status = nfsd4_encode_components('/', location->path, &p, buflen);
	if (status)
		return status;
	*pp = p;
	return 0;
}

/*
 * Return the path to an export point in the pseudo filesystem namespace
 * Returned string is safe to use as long as the caller holds a reference
 * to @exp.
 */
1324
static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1325 1326 1327 1328 1329
{
	struct svc_fh tmp_fh;
	char *path, *rootpath;

	fh_init(&tmp_fh, NFS4_FHSIZE);
1330
	*stat = exp_pseudoroot(rqstp, &tmp_fh);
1331 1332
	if (*stat)
		return NULL;
1333 1334 1335 1336 1337
	rootpath = tmp_fh.fh_export->ex_path;

	path = exp->ex_path;

	if (strncmp(path, rootpath, strlen(rootpath))) {
1338
		dprintk("nfsd: fs_locations failed;"
1339
			"%s is not contained in %s\n", path, rootpath);
1340 1341
		*stat = nfserr_notsupp;
		return NULL;
1342 1343 1344 1345 1346 1347 1348 1349
	}

	return path + strlen(rootpath);
}

/*
 *  encode a fs_locations structure
 */
1350
static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1351
				     struct svc_export *exp,
A
Al Viro 已提交
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				     __be32 **pp, int *buflen)
1353
{
1354
	__be32 status;
1355
	int i;
A
Al Viro 已提交
1356
	__be32 *p = *pp;
1357
	struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1358
	char *root = nfsd4_path(rqstp, exp, &status);
1359

1360 1361
	if (status)
		return status;
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
	status = nfsd4_encode_components('/', root, &p, buflen);
	if (status)
		return status;
	if ((*buflen -= 4) < 0)
		return nfserr_resource;
	WRITE32(fslocs->locations_count);
	for (i=0; i<fslocs->locations_count; i++) {
		status = nfsd4_encode_fs_location4(&fslocs->locations[i],
						   &p, buflen);
		if (status)
			return status;
	}
	*pp = p;
	return 0;
}
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static u32 nfs4_ftypes[16] = {
        NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
        NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
        NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
        NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
};

1385
static __be32
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nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
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			__be32 **p, int *buflen)
L
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{
	int status;

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

1407
static inline __be32
A
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nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
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{
	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
}

1413
static inline __be32
A
Al Viro 已提交
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nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
L
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{
	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
}

1419
static inline __be32
L
Linus Torvalds 已提交
1420
nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
A
Al Viro 已提交
1421
		__be32 **p, int *buflen)
L
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1422 1423 1424 1425
{
	return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
}

1426 1427 1428 1429
#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

1430
static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
{
	/* 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
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1445 1446 1447 1448 1449 1450 1451 1452

/*
 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
 * ourselves.
 *
 * @countp is the buffer size in _words_; upon successful return this becomes
 * replaced with the number of words written.
 */
1453
__be32
L
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1454
nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
A
Al Viro 已提交
1455
		struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1456
		struct svc_rqst *rqstp, int ignore_crossmnt)
L
Linus Torvalds 已提交
1457 1458 1459 1460 1461 1462 1463
{
	u32 bmval0 = bmval[0];
	u32 bmval1 = bmval[1];
	struct kstat stat;
	struct svc_fh tempfh;
	struct kstatfs statfs;
	int buflen = *countp << 2;
A
Al Viro 已提交
1464
	__be32 *attrlenp;
L
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1465 1466
	u32 dummy;
	u64 dummy64;
1467
	u32 rdattr_err = 0;
A
Al Viro 已提交
1468
	__be32 *p = buffer;
1469
	__be32 status;
1470
	int err;
L
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1471 1472 1473 1474 1475 1476 1477
	int aclsupport = 0;
	struct nfs4_acl *acl = NULL;

	BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
	BUG_ON(bmval0 & ~NFSD_SUPPORTED_ATTRS_WORD0);
	BUG_ON(bmval1 & ~NFSD_SUPPORTED_ATTRS_WORD1);

1478 1479 1480 1481 1482 1483
	if (exp->ex_fslocs.migrated) {
		status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
		if (status)
			goto out;
	}

1484 1485
	err = vfs_getattr(exp->ex_mnt, dentry, &stat);
	if (err)
L
Linus Torvalds 已提交
1486
		goto out_nfserr;
1487 1488
	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
			FATTR4_WORD0_MAXNAME)) ||
L
Linus Torvalds 已提交
1489 1490
	    (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
		       FATTR4_WORD1_SPACE_TOTAL))) {
1491 1492
		err = vfs_statfs(dentry, &statfs);
		if (err)
L
Linus Torvalds 已提交
1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503
			goto out_nfserr;
	}
	if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
		fh_init(&tempfh, NFS4_FHSIZE);
		status = fh_compose(&tempfh, exp, dentry, NULL);
		if (status)
			goto out;
		fhp = &tempfh;
	}
	if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
			| FATTR4_WORD0_SUPPORTED_ATTRS)) {
1504 1505
		err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
		aclsupport = (err == 0);
L
Linus Torvalds 已提交
1506
		if (bmval0 & FATTR4_WORD0_ACL) {
1507
			if (err == -EOPNOTSUPP)
L
Linus Torvalds 已提交
1508
				bmval0 &= ~FATTR4_WORD0_ACL;
1509
			else if (err == -EINVAL) {
L
Linus Torvalds 已提交
1510 1511
				status = nfserr_attrnotsupp;
				goto out;
1512
			} else if (err != 0)
L
Linus Torvalds 已提交
1513 1514 1515
				goto out_nfserr;
		}
	}
1516 1517 1518 1519 1520
	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
		if (exp->ex_fslocs.locations == NULL) {
			bmval0 &= ~FATTR4_WORD0_FS_LOCATIONS;
		}
	}
L
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1521 1522 1523 1524 1525 1526 1527 1528 1529
	if ((buflen -= 16) < 0)
		goto out_resource;

	WRITE32(2);
	WRITE32(bmval0);
	WRITE32(bmval1);
	attrlenp = p++;                /* to be backfilled later */

	if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1530
		u32 word0 = NFSD_SUPPORTED_ATTRS_WORD0;
L
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1531 1532
		if ((buflen -= 12) < 0)
			goto out_resource;
1533 1534 1535 1536
		if (!aclsupport)
			word0 &= ~FATTR4_WORD0_ACL;
		if (!exp->ex_fslocs.locations)
			word0 &= ~FATTR4_WORD0_FS_LOCATIONS;
L
Linus Torvalds 已提交
1537
		WRITE32(2);
1538
		WRITE32(word0);
L
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1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551
		WRITE32(NFSD_SUPPORTED_ATTRS_WORD1);
	}
	if (bmval0 & FATTR4_WORD0_TYPE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
		if (dummy == NF4BAD)
			goto out_serverfault;
		WRITE32(dummy);
	}
	if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
N
NeilBrown 已提交
1552
		if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
N
NeilBrown 已提交
1553
			WRITE32(NFS4_FH_PERSISTENT);
N
NeilBrown 已提交
1554
		else
N
NeilBrown 已提交
1555
			WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
L
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1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
	}
	if (bmval0 & FATTR4_WORD0_CHANGE) {
		/*
		 * Note: This _must_ be consistent with the scheme for writing
		 * change_info, so any changes made here must be reflected there
		 * as well.  (See xdr4.h:set_change_info() and the WRITECINFO()
		 * macro above.)
		 */
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE32(stat.ctime.tv_sec);
		WRITE32(stat.ctime.tv_nsec);
	}
	if (bmval0 & FATTR4_WORD0_SIZE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64(stat.size);
	}
	if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_FSID) {
		if ((buflen -= 16) < 0)
			goto out_resource;
1592 1593 1594
		if (exp->ex_fslocs.migrated) {
			WRITE64(NFS4_REFERRAL_FSID_MAJOR);
			WRITE64(NFS4_REFERRAL_FSID_MINOR);
1595 1596
		} else switch(fsid_source(fhp)) {
		case FSIDSOURCE_FSID:
L
Linus Torvalds 已提交
1597 1598
			WRITE64((u64)exp->ex_fsid);
			WRITE64((u64)0);
1599 1600
			break;
		case FSIDSOURCE_DEV:
L
Linus Torvalds 已提交
1601 1602 1603 1604
			WRITE32(0);
			WRITE32(MAJOR(stat.dev));
			WRITE32(0);
			WRITE32(MINOR(stat.dev));
1605 1606 1607 1608
			break;
		case FSIDSOURCE_UUID:
			WRITEMEM(exp->ex_uuid, 16);
			break;
L
Linus Torvalds 已提交
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
		}
	}
	if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(0);
	}
	if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(NFSD_LEASE_TIME);
	}
	if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
		if ((buflen -= 4) < 0)
			goto out_resource;
1624
		WRITE32(rdattr_err);
L
Linus Torvalds 已提交
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
	}
	if (bmval0 & FATTR4_WORD0_ACL) {
		struct nfs4_ace *ace;

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

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

1640
		for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
L
Linus Torvalds 已提交
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
			if ((buflen -= 4*3) < 0)
				goto out_resource;
			WRITE32(ace->type);
			WRITE32(ace->flag);
			WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
			status = nfsd4_encode_aclname(rqstp, ace->whotype,
				ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
				&p, &buflen);
			if (status == nfserr_resource)
				goto out_resource;
			if (status)
				goto out;
		}
	}
out_acl:
	if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(aclsupport ?
			ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
	}
	if (bmval0 & FATTR4_WORD0_CANSETTIME) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
		buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
		if (buflen < 0)
			goto out_resource;
		WRITE32(fhp->fh_handle.fh_size);
		WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
	}
	if (bmval0 & FATTR4_WORD0_FILEID) {
		if ((buflen -= 8) < 0)
			goto out_resource;
1692
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
	}
	if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_FREE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64((u64) statfs.f_ffree);
	}
	if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64((u64) statfs.f_files);
	}
1709 1710 1711 1712 1713 1714 1715
	if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
		status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
		if (status == nfserr_resource)
			goto out_resource;
		if (status)
			goto out;
	}
L
Linus Torvalds 已提交
1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
	if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE64(~(u64)0);
	}
	if (bmval0 & FATTR4_WORD0_MAXLINK) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(255);
	}
	if (bmval0 & FATTR4_WORD0_MAXNAME) {
		if ((buflen -= 4) < 0)
			goto out_resource;
1734
		WRITE32(statfs.f_namelen);
L
Linus Torvalds 已提交
1735 1736 1737 1738
	}
	if (bmval0 & FATTR4_WORD0_MAXREAD) {
		if ((buflen -= 8) < 0)
			goto out_resource;
1739
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
1740 1741 1742 1743
	}
	if (bmval0 & FATTR4_WORD0_MAXWRITE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
1744
		WRITE64((u64) svc_max_payload(rqstp));
L
Linus Torvalds 已提交
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
	}
	if (bmval1 & FATTR4_WORD1_MODE) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(stat.mode & S_IALLUGO);
	}
	if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(1);
	}
	if (bmval1 & FATTR4_WORD1_NUMLINKS) {
		if ((buflen -= 4) < 0)
			goto out_resource;
		WRITE32(stat.nlink);
	}
	if (bmval1 & FATTR4_WORD1_OWNER) {
		status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
		if (status == nfserr_resource)
			goto out_resource;
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
		status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
		if (status == nfserr_resource)
			goto out_resource;
		if (status)
			goto out;
	}
	if (bmval1 & FATTR4_WORD1_RAWDEV) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		WRITE32((u32) MAJOR(stat.rdev));
		WRITE32((u32) MINOR(stat.rdev));
	}
	if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_SPACE_USED) {
		if ((buflen -= 8) < 0)
			goto out_resource;
		dummy64 = (u64)stat.blocks << 9;
		WRITE64(dummy64);
	}
	if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(stat.atime.tv_sec);
		WRITE32(stat.atime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(1);
		WRITE32(0);
	}
	if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(stat.ctime.tv_sec);
		WRITE32(stat.ctime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
		if ((buflen -= 12) < 0)
			goto out_resource;
		WRITE32(0);
		WRITE32(stat.mtime.tv_sec);
		WRITE32(stat.mtime.tv_nsec);
	}
	if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
		if ((buflen -= 8) < 0)
                	goto out_resource;
1836 1837 1838 1839 1840 1841
		/*
		 * Get parent's attributes if not ignoring crossmount
		 * and this is the root of a cross-mounted filesystem.
		 */
		if (ignore_crossmnt == 0 &&
		    exp->ex_mnt->mnt_root->d_inode == dentry->d_inode) {
1842 1843 1844 1845 1846 1847
			err = vfs_getattr(exp->ex_mnt->mnt_parent,
				exp->ex_mnt->mnt_mountpoint, &stat);
			if (err)
				goto out_nfserr;
		}
		WRITE64(stat.ino);
L
Linus Torvalds 已提交
1848 1849 1850 1851 1852 1853
	}
	*attrlenp = htonl((char *)p - (char *)attrlenp - 4);
	*countp = p - buffer;
	status = nfs_ok;

out:
1854
	kfree(acl);
L
Linus Torvalds 已提交
1855 1856 1857 1858
	if (fhp == &tempfh)
		fh_put(&tempfh);
	return status;
out_nfserr:
1859
	status = nfserrno(err);
L
Linus Torvalds 已提交
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869
	goto out;
out_resource:
	*countp = 0;
	status = nfserr_resource;
	goto out;
out_serverfault:
	status = nfserr_serverfault;
	goto out;
}

1870
static __be32
L
Linus Torvalds 已提交
1871
nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
A
Al Viro 已提交
1872
		const char *name, int namlen, __be32 *p, int *buflen)
L
Linus Torvalds 已提交
1873 1874 1875
{
	struct svc_export *exp = cd->rd_fhp->fh_export;
	struct dentry *dentry;
1876
	__be32 nfserr;
1877
	int ignore_crossmnt = 0;
L
Linus Torvalds 已提交
1878 1879 1880 1881 1882 1883

	dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
	if (IS_ERR(dentry))
		return nfserrno(PTR_ERR(dentry));

	exp_get(exp);
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895
	/*
	 * 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.
	 */
	if (d_mountpoint(dentry) &&
	    (cd->rd_bmval[0] & ~FATTR4_WORD0_RDATTR_ERROR) == 0 &&
	    (cd->rd_bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID) == 0)
		ignore_crossmnt = 1;
	else if (d_mountpoint(dentry)) {
1896 1897
		int err;

A
Andy Adamson 已提交
1898 1899 1900 1901 1902
		/*
		 * Why the heck aren't we just using nfsd_lookup??
		 * Different "."/".." handling?  Something else?
		 * At least, add a comment here to explain....
		 */
1903 1904 1905
		err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
		if (err) {
			nfserr = nfserrno(err);
L
Linus Torvalds 已提交
1906 1907
			goto out_put;
		}
A
Andy Adamson 已提交
1908 1909 1910
		nfserr = check_nfsd_access(exp, cd->rd_rqstp);
		if (nfserr)
			goto out_put;
L
Linus Torvalds 已提交
1911 1912 1913

	}
	nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
1914
					cd->rd_rqstp, ignore_crossmnt);
L
Linus Torvalds 已提交
1915 1916 1917 1918 1919 1920
out_put:
	dput(dentry);
	exp_put(exp);
	return nfserr;
}

A
Al Viro 已提交
1921
static __be32 *
1922
nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
L
Linus Torvalds 已提交
1923
{
A
Al Viro 已提交
1924
	__be32 *attrlenp;
L
Linus Torvalds 已提交
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938

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

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

static int
1939 1940
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
1941
{
1942
	struct readdir_cd *ccd = ccdv;
L
Linus Torvalds 已提交
1943 1944
	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
	int buflen;
A
Al Viro 已提交
1945
	__be32 *p = cd->buffer;
1946
	__be32 nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986

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

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

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

	*p++ = xdr_one;                             /* mark entry present */
	cd->offset = p;                             /* remember pointer */
	p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
	p = xdr_encode_array(p, name, namlen);      /* name length & name */

	nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
	switch (nfserr) {
	case nfs_ok:
		p += buflen;
		break;
	case nfserr_resource:
		nfserr = nfserr_toosmall;
		goto fail;
	case nfserr_dropit:
		goto fail;
	default:
		/*
		 * If the client requested the RDATTR_ERROR attribute,
		 * we stuff the error code into this attribute
		 * and continue.  If this attribute was not requested,
		 * then in accordance with the spec, we fail the
		 * entire READDIR operation(!)
		 */
		if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
			goto fail;
		p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
1987 1988
		if (p == NULL) {
			nfserr = nfserr_toosmall;
L
Linus Torvalds 已提交
1989
			goto fail;
1990
		}
L
Linus Torvalds 已提交
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
	}
	cd->buflen -= (p - cd->buffer);
	cd->buffer = p;
	cd->common.err = nfs_ok;
	return 0;
fail:
	cd->common.err = nfserr;
	return -EINVAL;
}

static void
2002
nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
L
Linus Torvalds 已提交
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(8);
		WRITE32(access->ac_supported);
		WRITE32(access->ac_resp_access);
		ADJUST_ARGS();
	}
}

static void
2015
nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
L
Linus Torvalds 已提交
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
{
	ENCODE_SEQID_OP_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(close->cl_stateid.si_generation);
		WRITEMEM(&close->cl_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}
	ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
}


static void
2030
nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
L
Linus Torvalds 已提交
2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(8);
		WRITEMEM(commit->co_verf.data, 8);
		ADJUST_ARGS();
	}
}

static void
2042
nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
L
Linus Torvalds 已提交
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(32);
		WRITECINFO(create->cr_cinfo);
		WRITE32(2);
		WRITE32(create->cr_bmval[0]);
		WRITE32(create->cr_bmval[1]);
		ADJUST_ARGS();
	}
}

2056 2057
static __be32
nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
L
Linus Torvalds 已提交
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067
{
	struct svc_fh *fhp = getattr->ga_fhp;
	int buflen;

	if (nfserr)
		return nfserr;

	buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
	nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
				    resp->p, &buflen, getattr->ga_bmval,
2068
				    resp->rqstp, 0);
L
Linus Torvalds 已提交
2069 2070 2071 2072 2073 2074
	if (!nfserr)
		resp->p += buflen;
	return nfserr;
}

static void
2075
nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh *fhp)
L
Linus Torvalds 已提交
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114
{
	unsigned int len;
	ENCODE_HEAD;

	if (!nfserr) {
		len = fhp->fh_handle.fh_size;
		RESERVE_SPACE(len + 4);
		WRITE32(len);
		WRITEMEM(&fhp->fh_handle.fh_base, len);
		ADJUST_ARGS();
	}
}

/*
* Including all fields other than the name, a LOCK4denied structure requires
*   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
*/
static void
nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
{
	ENCODE_HEAD;

	RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
	WRITE64(ld->ld_start);
	WRITE64(ld->ld_length);
	WRITE32(ld->ld_type);
	if (ld->ld_sop) {
		WRITEMEM(&ld->ld_clientid, 8);
		WRITE32(ld->ld_sop->so_owner.len);
		WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
		kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
	}  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
		WRITE64((u64)0); /* clientid */
		WRITE32(0); /* length of owner name */
	}
	ADJUST_ARGS();
}

static void
2115
nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
L
Linus Torvalds 已提交
2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126
{
	ENCODE_SEQID_OP_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(4 + sizeof(stateid_t));
		WRITE32(lock->lk_resp_stateid.si_generation);
		WRITEMEM(&lock->lk_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	} else if (nfserr == nfserr_denied)
		nfsd4_encode_lock_denied(resp, &lock->lk_denied);

2127
	ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
L
Linus Torvalds 已提交
2128 2129 2130
}

static void
2131
nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
L
Linus Torvalds 已提交
2132 2133 2134 2135 2136 2137
{
	if (nfserr == nfserr_denied)
		nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
}

static void
2138
nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
L
Linus Torvalds 已提交
2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153
{
	ENCODE_SEQID_OP_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(locku->lu_stateid.si_generation);
		WRITEMEM(&locku->lu_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}
				        
	ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
}


static void
2154
nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
L
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2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(20);
		WRITECINFO(link->li_cinfo);
		ADJUST_ARGS();
	}
}


static void
2167
nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
L
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2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190
{
	ENCODE_SEQID_OP_HEAD;

	if (nfserr)
		goto out;

	RESERVE_SPACE(36 + sizeof(stateid_t));
	WRITE32(open->op_stateid.si_generation);
	WRITEMEM(&open->op_stateid.si_opaque, sizeof(stateid_opaque_t));
	WRITECINFO(open->op_cinfo);
	WRITE32(open->op_rflags);
	WRITE32(2);
	WRITE32(open->op_bmval[0]);
	WRITE32(open->op_bmval[1]);
	WRITE32(open->op_delegate_type);
	ADJUST_ARGS();

	switch (open->op_delegate_type) {
	case NFS4_OPEN_DELEGATE_NONE:
		break;
	case NFS4_OPEN_DELEGATE_READ:
		RESERVE_SPACE(20 + sizeof(stateid_t));
		WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
2191
		WRITE32(open->op_recall);
L
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2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231

		/*
		 * TODO: ACE's in delegations
		 */
		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
		WRITE32(0);
		WRITE32(0);
		WRITE32(0);   /* XXX: is NULL principal ok? */
		ADJUST_ARGS();
		break;
	case NFS4_OPEN_DELEGATE_WRITE:
		RESERVE_SPACE(32 + sizeof(stateid_t));
		WRITEMEM(&open->op_delegate_stateid, sizeof(stateid_t));
		WRITE32(0);

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

		/*
		 * TODO: ACE's in delegations
		 */
		WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
		WRITE32(0);
		WRITE32(0);
		WRITE32(0);   /* XXX: is NULL principal ok? */
		ADJUST_ARGS();
		break;
	default:
		BUG();
	}
	/* XXX save filehandle here */
out:
	ENCODE_SEQID_OP_TAIL(open->op_stateowner);
}

static void
2232
nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
L
Linus Torvalds 已提交
2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246
{
	ENCODE_SEQID_OP_HEAD;
				        
	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(oc->oc_resp_stateid.si_generation);
		WRITEMEM(&oc->oc_resp_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}

	ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
}

static void
2247
nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
L
Linus Torvalds 已提交
2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260
{
	ENCODE_SEQID_OP_HEAD;
				        
	if (!nfserr) {
		RESERVE_SPACE(sizeof(stateid_t));
		WRITE32(od->od_stateid.si_generation);
		WRITEMEM(&od->od_stateid.si_opaque, sizeof(stateid_opaque_t));
		ADJUST_ARGS();
	}

	ENCODE_SEQID_OP_TAIL(od->od_stateowner);
}

2261 2262
static __be32
nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2263
		  struct nfsd4_read *read)
L
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2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
{
	u32 eof;
	int v, pn;
	unsigned long maxcount; 
	long len;
	ENCODE_HEAD;

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

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

2278
	maxcount = svc_max_payload(resp->rqstp);
L
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2279 2280 2281 2282 2283 2284
	if (maxcount > read->rd_length)
		maxcount = read->rd_length;

	len = maxcount;
	v = 0;
	while (len > 0) {
2285
		pn = resp->rqstp->rq_resused++;
2286
		resp->rqstp->rq_vec[v].iov_base =
2287
			page_address(resp->rqstp->rq_respages[pn]);
2288
		resp->rqstp->rq_vec[v].iov_len =
2289
			len < PAGE_SIZE ? len : PAGE_SIZE;
L
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2290 2291 2292 2293 2294 2295
		v++;
		len -= PAGE_SIZE;
	}
	read->rd_vlen = v;

	nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2296
			read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
L
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2297 2298 2299 2300 2301 2302
			&maxcount);

	if (nfserr == nfserr_symlink)
		nfserr = nfserr_inval;
	if (nfserr)
		return nfserr;
2303 2304
	eof = (read->rd_offset + maxcount >=
	       read->rd_fhp->fh_dentry->d_inode->i_size);
L
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2305 2306 2307 2308

	WRITE32(eof);
	WRITE32(maxcount);
	ADJUST_ARGS();
2309 2310
	resp->xbuf->head[0].iov_len = (char*)p
					- (char*)resp->xbuf->head[0].iov_base;
L
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2311 2312
	resp->xbuf->page_len = maxcount;

2313 2314
	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = p;
L
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2315 2316
	resp->xbuf->tail[0].iov_len = 0;
	if (maxcount&3) {
2317 2318
		RESERVE_SPACE(4);
		WRITE32(0);
L
Linus Torvalds 已提交
2319 2320
		resp->xbuf->tail[0].iov_base += maxcount&3;
		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2321
		ADJUST_ARGS();
L
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2322 2323 2324 2325
	}
	return 0;
}

2326 2327
static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
L
Linus Torvalds 已提交
2328 2329 2330 2331 2332 2333 2334 2335 2336 2337
{
	int maxcount;
	char *page;
	ENCODE_HEAD;

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

2338
	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
L
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2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356

	maxcount = PAGE_SIZE;
	RESERVE_SPACE(4);

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

	WRITE32(maxcount);
	ADJUST_ARGS();
2357 2358 2359
	resp->xbuf->head[0].iov_len = (char*)p
				- (char*)resp->xbuf->head[0].iov_base;
	resp->xbuf->page_len = maxcount;
L
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2360

2361 2362
	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = p;
L
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2363 2364
	resp->xbuf->tail[0].iov_len = 0;
	if (maxcount&3) {
2365 2366
		RESERVE_SPACE(4);
		WRITE32(0);
L
Linus Torvalds 已提交
2367 2368
		resp->xbuf->tail[0].iov_base += maxcount&3;
		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2369
		ADJUST_ARGS();
L
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2370 2371 2372 2373
	}
	return 0;
}

2374 2375
static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
L
Linus Torvalds 已提交
2376 2377 2378
{
	int maxcount;
	loff_t offset;
A
Al Viro 已提交
2379
	__be32 *page, *savep, *tailbase;
L
Linus Torvalds 已提交
2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394
	ENCODE_HEAD;

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

	RESERVE_SPACE(8);  /* verifier */
	savep = p;

	/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
	WRITE32(0);
	WRITE32(0);
	ADJUST_ARGS();
	resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2395
	tailbase = p;
L
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2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411

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

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

2412
	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
L
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2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
	readdir->common.err = 0;
	readdir->buflen = maxcount;
	readdir->buffer = page;
	readdir->offset = NULL;

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

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

	p = readdir->buffer;
	*p++ = 0;	/* no more entries */
	*p++ = htonl(readdir->common.err == nfserr_eof);
2437 2438
	resp->xbuf->page_len = ((char*)p) - (char*)page_address(
		resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
L
Linus Torvalds 已提交
2439

2440 2441
	/* Use rest of head for padding and remaining ops: */
	resp->xbuf->tail[0].iov_base = tailbase;
L
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2442 2443
	resp->xbuf->tail[0].iov_len = 0;
	resp->p = resp->xbuf->tail[0].iov_base;
2444
	resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
L
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2445 2446 2447 2448 2449 2450 2451 2452 2453

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

static void
2454
nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
L
Linus Torvalds 已提交
2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(20);
		WRITECINFO(remove->rm_cinfo);
		ADJUST_ARGS();
	}
}

static void
2466
nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
L
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2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(40);
		WRITECINFO(rename->rn_sinfo);
		WRITECINFO(rename->rn_tinfo);
		ADJUST_ARGS();
	}
}

A
Andy Adamson 已提交
2478
static void
2479
nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
A
Andy Adamson 已提交
2480 2481 2482 2483
		     struct nfsd4_secinfo *secinfo)
{
	int i = 0;
	struct svc_export *exp = secinfo->si_exp;
2484 2485 2486
	u32 nflavs;
	struct exp_flavor_info *flavs;
	struct exp_flavor_info def_flavs[2];
A
Andy Adamson 已提交
2487 2488 2489 2490
	ENCODE_HEAD;

	if (nfserr)
		goto out;
2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510
	if (exp->ex_nflavors) {
		flavs = exp->ex_flavors;
		nflavs = exp->ex_nflavors;
	} else { /* Handling of some defaults in absence of real secinfo: */
		flavs = def_flavs;
		if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
			nflavs = 2;
			flavs[0].pseudoflavor = RPC_AUTH_UNIX;
			flavs[1].pseudoflavor = RPC_AUTH_NULL;
		} else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
			nflavs = 1;
			flavs[0].pseudoflavor
					= svcauth_gss_flavor(exp->ex_client);
		} else {
			nflavs = 1;
			flavs[0].pseudoflavor
					= exp->ex_client->flavour->flavour;
		}
	}

A
Andy Adamson 已提交
2511
	RESERVE_SPACE(4);
2512
	WRITE32(nflavs);
A
Andy Adamson 已提交
2513
	ADJUST_ARGS();
2514 2515
	for (i = 0; i < nflavs; i++) {
		u32 flav = flavs[i].pseudoflavor;
A
Andy Adamson 已提交
2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543
		struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);

		if (gm) {
			RESERVE_SPACE(4);
			WRITE32(RPC_AUTH_GSS);
			ADJUST_ARGS();
			RESERVE_SPACE(4 + gm->gm_oid.len);
			WRITE32(gm->gm_oid.len);
			WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
			ADJUST_ARGS();
			RESERVE_SPACE(4);
			WRITE32(0); /* qop */
			ADJUST_ARGS();
			RESERVE_SPACE(4);
			WRITE32(gss_pseudoflavor_to_service(gm, flav));
			ADJUST_ARGS();
			gss_mech_put(gm);
		} else {
			RESERVE_SPACE(4);
			WRITE32(flav);
			ADJUST_ARGS();
		}
	}
out:
	if (exp)
		exp_put(exp);
}

L
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2544 2545 2546 2547 2548
/*
 * The SETATTR encode routine is special -- it always encodes a bitmap,
 * regardless of the error status.
 */
static void
2549
nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
L
Linus Torvalds 已提交
2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567
{
	ENCODE_HEAD;

	RESERVE_SPACE(12);
	if (nfserr) {
		WRITE32(2);
		WRITE32(0);
		WRITE32(0);
	}
	else {
		WRITE32(2);
		WRITE32(setattr->sa_bmval[0]);
		WRITE32(setattr->sa_bmval[1]);
	}
	ADJUST_ARGS();
}

static void
2568
nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
L
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2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(8 + sizeof(nfs4_verifier));
		WRITEMEM(&scd->se_clientid, 8);
		WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
		ADJUST_ARGS();
	}
	else if (nfserr == nfserr_clid_inuse) {
		RESERVE_SPACE(8);
		WRITE32(0);
		WRITE32(0);
		ADJUST_ARGS();
	}
}

static void
2587
nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
L
Linus Torvalds 已提交
2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602
{
	ENCODE_HEAD;

	if (!nfserr) {
		RESERVE_SPACE(16);
		WRITE32(write->wr_bytes_written);
		WRITE32(write->wr_how_written);
		WRITEMEM(write->wr_verifier.data, 8);
		ADJUST_ARGS();
	}
}

void
nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
A
Al Viro 已提交
2603
	__be32 *statp;
L
Linus Torvalds 已提交
2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683
	ENCODE_HEAD;

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

	switch (op->opnum) {
	case OP_ACCESS:
		nfsd4_encode_access(resp, op->status, &op->u.access);
		break;
	case OP_CLOSE:
		nfsd4_encode_close(resp, op->status, &op->u.close);
		break;
	case OP_COMMIT:
		nfsd4_encode_commit(resp, op->status, &op->u.commit);
		break;
	case OP_CREATE:
		nfsd4_encode_create(resp, op->status, &op->u.create);
		break;
	case OP_DELEGRETURN:
		break;
	case OP_GETATTR:
		op->status = nfsd4_encode_getattr(resp, op->status, &op->u.getattr);
		break;
	case OP_GETFH:
		nfsd4_encode_getfh(resp, op->status, op->u.getfh);
		break;
	case OP_LINK:
		nfsd4_encode_link(resp, op->status, &op->u.link);
		break;
	case OP_LOCK:
		nfsd4_encode_lock(resp, op->status, &op->u.lock);
		break;
	case OP_LOCKT:
		nfsd4_encode_lockt(resp, op->status, &op->u.lockt);
		break;
	case OP_LOCKU:
		nfsd4_encode_locku(resp, op->status, &op->u.locku);
		break;
	case OP_LOOKUP:
		break;
	case OP_LOOKUPP:
		break;
	case OP_NVERIFY:
		break;
	case OP_OPEN:
		nfsd4_encode_open(resp, op->status, &op->u.open);
		break;
	case OP_OPEN_CONFIRM:
		nfsd4_encode_open_confirm(resp, op->status, &op->u.open_confirm);
		break;
	case OP_OPEN_DOWNGRADE:
		nfsd4_encode_open_downgrade(resp, op->status, &op->u.open_downgrade);
		break;
	case OP_PUTFH:
		break;
	case OP_PUTROOTFH:
		break;
	case OP_READ:
		op->status = nfsd4_encode_read(resp, op->status, &op->u.read);
		break;
	case OP_READDIR:
		op->status = nfsd4_encode_readdir(resp, op->status, &op->u.readdir);
		break;
	case OP_READLINK:
		op->status = nfsd4_encode_readlink(resp, op->status, &op->u.readlink);
		break;
	case OP_REMOVE:
		nfsd4_encode_remove(resp, op->status, &op->u.remove);
		break;
	case OP_RENAME:
		nfsd4_encode_rename(resp, op->status, &op->u.rename);
		break;
	case OP_RENEW:
		break;
	case OP_RESTOREFH:
		break;
	case OP_SAVEFH:
		break;
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	case OP_SECINFO:
		nfsd4_encode_secinfo(resp, op->status, &op->u.secinfo);
		break;
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	case OP_SETATTR:
		nfsd4_encode_setattr(resp, op->status, &op->u.setattr);
		break;
	case OP_SETCLIENTID:
		nfsd4_encode_setclientid(resp, op->status, &op->u.setclientid);
		break;
	case OP_SETCLIENTID_CONFIRM:
		break;
	case OP_VERIFY:
		break;
	case OP_WRITE:
		nfsd4_encode_write(resp, op->status, &op->u.write);
		break;
	case OP_RELEASE_LOCKOWNER:
		break;
	default:
		break;
	}

	/*
	 * Note: We write the status directly, instead of using WRITE32(),
	 * since it is already in network byte order.
	 */
	*statp = op->status;
}

/* 
 * Encode the reply stored in the stateowner reply cache 
 * 
 * XDR note: do not encode rp->rp_buflen: the buffer contains the
 * previously sent already encoded operation.
 *
 * called with nfs4_lock_state() held
 */
void
nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
{
	ENCODE_HEAD;
	struct nfs4_replay *rp = op->replay;

	BUG_ON(!rp);

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

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

/*
 * END OF "GENERIC" ENCODE ROUTINES.
 */

int
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nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
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{
        return xdr_ressize_check(rqstp, p);
}

void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
{
	if (args->ops != args->iops) {
		kfree(args->ops);
		args->ops = args->iops;
	}
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	kfree(args->tmpp);
	args->tmpp = NULL;
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	while (args->to_free) {
		struct tmpbuf *tb = args->to_free;
		args->to_free = tb->next;
		tb->release(tb->buf);
		kfree(tb);
	}
}

int
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nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
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{
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	__be32 status;
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	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;

	status = nfsd4_decode_compound(args);
	if (status) {
		nfsd4_release_compoundargs(args);
	}
	return !status;
}

int
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nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
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{
	/*
	 * All that remains is to write the tag and operation count...
	 */
	struct kvec *iov;
	p = resp->tagp;
	*p++ = htonl(resp->taglen);
	memcpy(p, resp->tag, resp->taglen);
	p += XDR_QUADLEN(resp->taglen);
	*p++ = htonl(resp->opcnt);

	if (rqstp->rq_res.page_len) 
		iov = &rqstp->rq_res.tail[0];
	else
		iov = &rqstp->rq_res.head[0];
	iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
	BUG_ON(iov->iov_len > PAGE_SIZE);
	return 1;
}

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