Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2536 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
new file mode 100644
index 000000000000..36a058a112d5
--- /dev/null
+++ b/fs/nfsd/nfs4xdr.c
@@ -0,0 +1,2536 @@
+/*
+ *  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/smp_lock.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>
+
+#define NFSDDBG_FACILITY		NFSDDBG_XDR
+
+static int
+check_filename(char *str, int len, int err)
+{
+	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				\
+	u32 *p;					\
+	int status
+#define DECODE_TAIL				\
+	status = 0;				\
+out:						\
+	return status;				\
+xdr_error:					\
+	printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__);	\
+	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)) {			\
+		printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
+		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))) { \
+		printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); \
+		goto xdr_error;			\
+	}					\
+} while (0)
+
+u32 *read_buf(struct nfsd4_compoundargs *argp, int nbytes)
+{
+	/* We want more bytes than seem to be available.
+	 * Maybe we need a new page, maybe we have just run out
+	 */
+	int avail = (char*)argp->end - (char*)argp->p;
+	u32 *p;
+	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 {
+		if (argp->tmpp)
+			kfree(argp->tmpp);
+		p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
+		if (!p)
+			return NULL;
+		
+	}
+	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;
+}
+
+char *savemem(struct nfsd4_compoundargs *argp, u32 *p, int nbytes)
+{
+	void *new = NULL;
+	if (p == argp->tmp) {
+		new = kmalloc(nbytes, GFP_KERNEL);
+		if (!new) return NULL;
+		p = new;
+		memcpy(p, argp->tmp, nbytes);
+	} else {
+		if (p != argp->tmpp)
+			BUG();
+		argp->tmpp = NULL;
+	}
+	if (defer_free(argp, kfree, p)) {
+		kfree(new);
+		return NULL;
+	} else
+		return (char *)p;
+}
+
+
+static int
+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;
+}
+
+static int
+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;
+
+	DECODE_HEAD;
+	iattr->ia_valid = 0;
+	if ((status = nfsd4_decode_bitmap(argp, bmval)))
+		return status;
+
+	/*
+	 * According to spec, unsupported attributes return ERR_NOTSUPP;
+	 * 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) {
+		int nace, i;
+		struct nfs4_ace ace;
+
+		READ_BUF(4); len += 4;
+		READ32(nace);
+
+		*acl = nfs4_acl_new();
+		if (*acl == NULL) {
+			status = -ENOMEM;
+			goto out_nfserr;
+		}
+		defer_free(argp, (void (*)(const void *))nfs4_acl_free, *acl);
+
+		for (i = 0; i < nace; i++) {
+			READ_BUF(16); len += 16;
+			READ32(ace.type);
+			READ32(ace.flag);
+			READ32(ace.access_mask);
+			READ32(dummy32);
+			READ_BUF(dummy32);
+			len += XDR_QUADLEN(dummy32) << 2;
+			READMEM(buf, dummy32);
+			ace.whotype = nfs4_acl_get_whotype(buf, dummy32);
+			status = 0;
+			if (ace.whotype != NFS4_ACL_WHO_NAMED)
+				ace.who = 0;
+			else if (ace.flag & NFS4_ACE_IDENTIFIER_GROUP)
+				status = nfsd_map_name_to_gid(argp->rqstp,
+						buf, dummy32, &ace.who);
+			else
+				status = nfsd_map_name_to_uid(argp->rqstp,
+						buf, dummy32, &ace.who);
+			if (status)
+				goto out_nfserr;
+			if (nfs4_acl_add_ace(*acl, ace.type, ace.flag,
+				 ace.access_mask, ace.whotype, ace.who) != 0) {
+				status = -ENOMEM;
+				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);
+		if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
+			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);
+		if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
+			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:
+	status = nfserrno(status);
+	goto out;
+}
+
+static int
+nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
+{
+	DECODE_HEAD;
+
+	READ_BUF(4);
+	READ32(access->ac_req_access);
+
+	DECODE_TAIL;
+}
+
+static int
+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;
+}
+
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static inline int
+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;
+}
+
+static inline int
+nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
+{
+	return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
+}
+
+static int
+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;
+}
+
+static int
+nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
+{
+	DECODE_HEAD;
+
+	lock->lk_stateowner = NULL;
+	/*
+	* 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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
+{
+	DECODE_HEAD;
+
+	READ_BUF(sizeof(clientid_t));
+	COPYMEM(clientid, sizeof(clientid_t));
+
+	DECODE_TAIL;
+}
+
+static int
+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;
+}
+
+static int
+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;
+}
+
+static int
+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 */
+static int
+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;
+}
+
+static int
+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) {
+		printk(KERN_NOTICE "xdr error! (%s:%d)\n", __FILE__, __LINE__); 
+		goto xdr_error;
+	}
+	write->wr_vec[0].iov_base = p;
+	write->wr_vec[0].iov_len = avail;
+	v = 0;
+	len = write->wr_buflen;
+	while (len > write->wr_vec[v].iov_len) {
+		len -= write->wr_vec[v].iov_len;
+		v++;
+		write->wr_vec[v].iov_base = page_address(argp->pagelist[0]);
+		argp->pagelist++;
+		if (argp->pagelen >= PAGE_SIZE) {
+			write->wr_vec[v].iov_len = PAGE_SIZE;
+			argp->pagelen -= PAGE_SIZE;
+		} else {
+			write->wr_vec[v].iov_len = argp->pagelen;
+			argp->pagelen -= len;
+		}
+	}
+	argp->end = (u32*) (write->wr_vec[v].iov_base + write->wr_vec[v].iov_len);
+	argp->p = (u32*)  (write->wr_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
+	write->wr_vec[v].iov_len = len;
+	write->wr_vlen = v+1;
+
+	DECODE_TAIL;
+}
+
+static int
+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;
+}
+
+static int
+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;
+
+	if (argp->opcnt > sizeof(argp->iops)/sizeof(argp->iops[0])) {
+		argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
+		if (!argp->ops) {
+			argp->ops = argp->iops;
+			printk(KERN_INFO "nfsd: couldn't allocate room for COMPOUND\n");
+			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;
+		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...
+ */
+#define ENCODE_HEAD              u32 *p
+
+#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					\
+	u32 *p;							\
+	u32 *save;						\
+								\
+	save = resp->p;
+
+/*
+ * Routine for encoding the result of a
+ * "seqid-mutating" NFSv4 operation.  This is
+ * where seqids are incremented, and the
+ * replay cache is filled.
+ */
+
+#define ENCODE_SEQID_OP_TAIL(stateowner) do {			\
+	if (seqid_mutating_err(nfserr) && stateowner) { 	\
+		if (stateowner->so_confirmed)			\
+			stateowner->so_seqid++;			\
+		stateowner->so_replay.rp_status = nfserr;   	\
+		stateowner->so_replay.rp_buflen = 		\
+			  (((char *)(resp)->p - (char *)save)); \
+		memcpy(stateowner->so_replay.rp_buf, save,      \
+ 			stateowner->so_replay.rp_buflen); 	\
+	} } while (0);
+
+
+static u32 nfs4_ftypes[16] = {
+        NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
+        NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
+        NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
+        NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
+};
+
+static int
+nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
+			u32 **p, int *buflen)
+{
+	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;
+}
+
+static inline int
+nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, u32 **p, int *buflen)
+{
+	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
+}
+
+static inline int
+nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, u32 **p, int *buflen)
+{
+	return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
+}
+
+static inline int
+nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
+		u32 **p, int *buflen)
+{
+	return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
+}
+
+
+/*
+ * 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.
+ */
+int
+nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
+		struct dentry *dentry, u32 *buffer, int *countp, u32 *bmval,
+		struct svc_rqst *rqstp)
+{
+	u32 bmval0 = bmval[0];
+	u32 bmval1 = bmval[1];
+	struct kstat stat;
+	struct svc_fh tempfh;
+	struct kstatfs statfs;
+	int buflen = *countp << 2;
+	u32 *attrlenp;
+	u32 dummy;
+	u64 dummy64;
+	u32 *p = buffer;
+	int status;
+	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);
+
+	status = vfs_getattr(exp->ex_mnt, dentry, &stat);
+	if (status)
+		goto out_nfserr;
+	if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL)) ||
+	    (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
+		       FATTR4_WORD1_SPACE_TOTAL))) {
+		status = vfs_statfs(dentry->d_inode->i_sb, &statfs);
+		if (status)
+			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)) {
+		status = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
+		aclsupport = (status == 0);
+		if (bmval0 & FATTR4_WORD0_ACL) {
+			if (status == -EOPNOTSUPP)
+				bmval0 &= ~FATTR4_WORD0_ACL;
+			else if (status == -EINVAL) {
+				status = nfserr_attrnotsupp;
+				goto out;
+			} else if (status != 0)
+				goto out_nfserr;
+		}
+	}
+	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) {
+		if ((buflen -= 12) < 0)
+			goto out_resource;
+		WRITE32(2);
+		WRITE32(aclsupport ?
+			NFSD_SUPPORTED_ATTRS_WORD0 :
+			NFSD_SUPPORTED_ATTRS_WORD0 & ~FATTR4_WORD0_ACL);
+		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;
+		WRITE32( NFS4_FH_NOEXPIRE_WITH_OPEN | NFS4_FH_VOL_RENAME );
+	}
+	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;
+		if (is_fsid(fhp, rqstp->rq_reffh)) {
+			WRITE64((u64)exp->ex_fsid);
+			WRITE64((u64)0);
+		} else {
+			WRITE32(0);
+			WRITE32(MAJOR(stat.dev));
+			WRITE32(0);
+			WRITE32(MINOR(stat.dev));
+		}
+	}
+	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;
+		WRITE32(0);
+	}
+	if (bmval0 & FATTR4_WORD0_ACL) {
+		struct nfs4_ace *ace;
+		struct list_head *h;
+
+		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);
+
+		list_for_each(h, &acl->ace_head) {
+			ace = list_entry(h, struct nfs4_ace, l_ace);
+
+			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;
+		WRITE64((u64) stat.ino);
+	}
+	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);
+	}
+	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;
+		WRITE32(~(u32) 0);
+	}
+	if (bmval0 & FATTR4_WORD0_MAXREAD) {
+		if ((buflen -= 8) < 0)
+			goto out_resource;
+		WRITE64((u64) NFSSVC_MAXBLKSIZE);
+	}
+	if (bmval0 & FATTR4_WORD0_MAXWRITE) {
+		if ((buflen -= 8) < 0)
+			goto out_resource;
+		WRITE64((u64) NFSSVC_MAXBLKSIZE);
+	}
+	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) {
+		struct dentry *mnt_pnt, *mnt_root;
+
+		if ((buflen -= 8) < 0)
+                	goto out_resource;
+		mnt_root = exp->ex_mnt->mnt_root;
+		if (mnt_root->d_inode == dentry->d_inode) {
+			mnt_pnt = exp->ex_mnt->mnt_mountpoint;
+			WRITE64((u64) mnt_pnt->d_inode->i_ino);
+		} else
+                	WRITE64((u64) stat.ino);
+	}
+	*attrlenp = htonl((char *)p - (char *)attrlenp - 4);
+	*countp = p - buffer;
+	status = nfs_ok;
+
+out:
+	nfs4_acl_free(acl);
+	if (fhp == &tempfh)
+		fh_put(&tempfh);
+	return status;
+out_nfserr:
+	status = nfserrno(status);
+	goto out;
+out_resource:
+	*countp = 0;
+	status = nfserr_resource;
+	goto out;
+out_serverfault:
+	status = nfserr_serverfault;
+	goto out;
+}
+
+static int
+nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
+		const char *name, int namlen, u32 *p, int *buflen)
+{
+	struct svc_export *exp = cd->rd_fhp->fh_export;
+	struct dentry *dentry;
+	int nfserr;
+
+	dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
+	if (IS_ERR(dentry))
+		return nfserrno(PTR_ERR(dentry));
+
+	exp_get(exp);
+	if (d_mountpoint(dentry)) {
+		if (nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp)) {
+		/*
+		 * -EAGAIN is the only error returned from
+		 * nfsd_cross_mnt() and it indicates that an
+		 * up-call has  been initiated to fill in the export
+		 * options on exp.  When the answer comes back,
+		 * this call will be retried.
+		 */
+			nfserr = nfserr_dropit;
+			goto out_put;
+		}
+
+	}
+	nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
+					cd->rd_rqstp);
+out_put:
+	dput(dentry);
+	exp_put(exp);
+	return nfserr;
+}
+
+static u32 *
+nfsd4_encode_rdattr_error(u32 *p, int buflen, int nfserr)
+{
+	u32 *attrlenp;
+
+	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
+nfsd4_encode_dirent(struct readdir_cd *ccd, const char *name, int namlen,
+		    loff_t offset, ino_t ino, unsigned int d_type)
+{
+	struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
+	int buflen;
+	u32 *p = cd->buffer;
+	int nfserr = nfserr_toosmall;
+
+	/* 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;
+		nfserr = nfserr_toosmall;
+		p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
+		if (p == NULL)
+			goto fail;
+	}
+	cd->buflen -= (p - cd->buffer);
+	cd->buffer = p;
+	cd->common.err = nfs_ok;
+	return 0;
+fail:
+	cd->common.err = nfserr;
+	return -EINVAL;
+}
+
+static void
+nfsd4_encode_access(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_access *access)
+{
+	ENCODE_HEAD;
+
+	if (!nfserr) {
+		RESERVE_SPACE(8);
+		WRITE32(access->ac_supported);
+		WRITE32(access->ac_resp_access);
+		ADJUST_ARGS();
+	}
+}
+
+static void
+nfsd4_encode_close(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_close *close)
+{
+	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
+nfsd4_encode_commit(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_commit *commit)
+{
+	ENCODE_HEAD;
+
+	if (!nfserr) {
+		RESERVE_SPACE(8);
+		WRITEMEM(commit->co_verf.data, 8);
+		ADJUST_ARGS();
+	}
+}
+
+static void
+nfsd4_encode_create(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_create *create)
+{
+	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();
+	}
+}
+
+static int
+nfsd4_encode_getattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_getattr *getattr)
+{
+	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,
+				    resp->rqstp);
+
+	if (!nfserr)
+		resp->p += buflen;
+	return nfserr;
+}
+
+static void
+nfsd4_encode_getfh(struct nfsd4_compoundres *resp, int nfserr, struct svc_fh *fhp)
+{
+	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
+nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
+{
+
+	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);
+
+	ENCODE_SEQID_OP_TAIL(lock->lk_stateowner);
+}
+
+static void
+nfsd4_encode_lockt(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lockt *lockt)
+{
+	if (nfserr == nfserr_denied)
+		nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
+}
+
+static void
+nfsd4_encode_locku(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_locku *locku)
+{
+	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
+nfsd4_encode_link(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_link *link)
+{
+	ENCODE_HEAD;
+
+	if (!nfserr) {
+		RESERVE_SPACE(20);
+		WRITECINFO(link->li_cinfo);
+		ADJUST_ARGS();
+	}
+}
+
+
+static void
+nfsd4_encode_open(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open *open)
+{
+	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));
+		WRITE32(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;
+	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
+nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_confirm *oc)
+{
+	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
+nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_open_downgrade *od)
+{
+	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);
+}
+
+static int
+nfsd4_encode_read(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_read *read)
+{
+	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 */
+
+	maxcount = NFSSVC_MAXBLKSIZE;
+	if (maxcount > read->rd_length)
+		maxcount = read->rd_length;
+
+	len = maxcount;
+	v = 0;
+	while (len > 0) {
+		pn = resp->rqstp->rq_resused;
+		svc_take_page(resp->rqstp);
+		read->rd_iov[v].iov_base = page_address(resp->rqstp->rq_respages[pn]);
+		read->rd_iov[v].iov_len = len < PAGE_SIZE ? len : PAGE_SIZE;
+		v++;
+		len -= PAGE_SIZE;
+	}
+	read->rd_vlen = v;
+
+	nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
+			read->rd_offset, read->rd_iov, read->rd_vlen,
+			&maxcount);
+
+	if (nfserr == nfserr_symlink)
+		nfserr = nfserr_inval;
+	if (nfserr)
+		return nfserr;
+	eof = (read->rd_offset + maxcount >= read->rd_fhp->fh_dentry->d_inode->i_size);
+
+	WRITE32(eof);
+	WRITE32(maxcount);
+	ADJUST_ARGS();
+	resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
+
+	resp->xbuf->page_len = maxcount;
+
+	/* read zero bytes -> don't set up tail */
+	if(!maxcount)
+		return 0;        
+
+	/* set up page for remaining responses */
+	svc_take_page(resp->rqstp);
+	resp->xbuf->tail[0].iov_base = 
+		page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
+	resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
+	resp->xbuf->tail[0].iov_len = 0;
+	resp->p = resp->xbuf->tail[0].iov_base;
+	resp->end = resp->p + PAGE_SIZE/4;
+
+	if (maxcount&3) {
+		*(resp->p)++ = 0;
+		resp->xbuf->tail[0].iov_base += maxcount&3;
+		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
+	}
+	return 0;
+}
+
+static int
+nfsd4_encode_readlink(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readlink *readlink)
+{
+	int maxcount;
+	char *page;
+	ENCODE_HEAD;
+
+	if (nfserr)
+		return nfserr;
+	if (resp->xbuf->page_len)
+		return nfserr_resource;
+
+	svc_take_page(resp->rqstp);
+	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
+
+	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();
+	resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
+
+	svc_take_page(resp->rqstp);
+	resp->xbuf->tail[0].iov_base = 
+		page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
+	resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
+	resp->xbuf->tail[0].iov_len = 0;
+	resp->p = resp->xbuf->tail[0].iov_base;
+	resp->end = resp->p + PAGE_SIZE/4;
+
+	resp->xbuf->page_len = maxcount;
+	if (maxcount&3) {
+		*(resp->p)++ = 0;
+		resp->xbuf->tail[0].iov_base += maxcount&3;
+		resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
+	}
+	return 0;
+}
+
+static int
+nfsd4_encode_readdir(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_readdir *readdir)
+{
+	int maxcount;
+	loff_t offset;
+	u32 *page, *savep;
+	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;
+
+	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;
+	}
+
+	svc_take_page(resp->rqstp);
+	page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
+	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);
+	resp->xbuf->page_len = ((char*)p) - (char*)page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
+
+	/* allocate a page for the tail */
+	svc_take_page(resp->rqstp);
+	resp->xbuf->tail[0].iov_base = 
+		page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
+	resp->rqstp->rq_restailpage = resp->rqstp->rq_resused-1;
+	resp->xbuf->tail[0].iov_len = 0;
+	resp->p = resp->xbuf->tail[0].iov_base;
+	resp->end = resp->p + PAGE_SIZE/4;
+
+	return 0;
+err_no_verf:
+	p = savep;
+	ADJUST_ARGS();
+	return nfserr;
+}
+
+static void
+nfsd4_encode_remove(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_remove *remove)
+{
+	ENCODE_HEAD;
+
+	if (!nfserr) {
+		RESERVE_SPACE(20);
+		WRITECINFO(remove->rm_cinfo);
+		ADJUST_ARGS();
+	}
+}
+
+static void
+nfsd4_encode_rename(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_rename *rename)
+{
+	ENCODE_HEAD;
+
+	if (!nfserr) {
+		RESERVE_SPACE(40);
+		WRITECINFO(rename->rn_sinfo);
+		WRITECINFO(rename->rn_tinfo);
+		ADJUST_ARGS();
+	}
+}
+
+/*
+ * The SETATTR encode routine is special -- it always encodes a bitmap,
+ * regardless of the error status.
+ */
+static void
+nfsd4_encode_setattr(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setattr *setattr)
+{
+	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
+nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_setclientid *scd)
+{
+	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
+nfsd4_encode_write(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_write *write)
+{
+	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)
+{
+	u32 *statp;
+	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;
+	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
+nfs4svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy)
+{
+        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;
+	}
+	if (args->tmpp) {
+		kfree(args->tmpp);
+		args->tmpp = NULL;
+	}
+	while (args->to_free) {
+		struct tmpbuf *tb = args->to_free;
+		args->to_free = tb->next;
+		tb->release(tb->buf);
+		kfree(tb);
+	}
+}
+
+int
+nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundargs *args)
+{
+	int status;
+
+	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
+nfs4svc_encode_compoundres(struct svc_rqst *rqstp, u32 *p, struct nfsd4_compoundres *resp)
+{
+	/*
+	 * 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:
+ */