text: /* AFS File Server client stubs
   *
   * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version
   * 2 of the License, or (at your option) any later version.
   */
  
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/sched.h>
  #include <linux/circ_buf.h>
  #include "internal.h"
  #include "afs_fs.h"
  
  /*
   * decode an AFSFid block
   */
  static void xdr_decode_AFSFid(const __be32 **_bp, struct afs_fid *fid)
  {
  	const __be32 *bp = *_bp;
  
  	fid->vid		= ntohl(*bp++);
  	fid->vnode		= ntohl(*bp++);
  	fid->unique		= ntohl(*bp++);
  	*_bp = bp;
  }
  
  /*
   * decode an AFSFetchStatus block
   */
  static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
  				      struct afs_file_status *status,
  				      struct afs_vnode *vnode,
  				      afs_dataversion_t *store_version)
  {
  	afs_dataversion_t expected_version;
  	const __be32 *bp = *_bp;
  	umode_t mode;
  	u64 data_version, size;
  	u32 changed = 0; /* becomes non-zero if ctime-type changes seen */
  	kuid_t owner;
  	kgid_t group;
  
  #define EXTRACT(DST)				\
  	do {					\
  		u32 x = ntohl(*bp++);		\
  		changed |= DST - x;		\
  		DST = x;			\
  	} while (0)
  
  	status->if_version = ntohl(*bp++);
  	EXTRACT(status->type);
  	EXTRACT(status->nlink);
  	size = ntohl(*bp++);
  	data_version = ntohl(*bp++);
  	EXTRACT(status->author);
  	owner = make_kuid(&init_user_ns, ntohl(*bp++));
  	changed |= !uid_eq(owner, status->owner);
  	status->owner = owner;
  	EXTRACT(status->caller_access); /* call ticket dependent */
  	EXTRACT(status->anon_access);
  	EXTRACT(status->mode);
  	EXTRACT(status->parent.vnode);
  	EXTRACT(status->parent.unique);
  	bp++; /* seg size */
  	status->mtime_client = ntohl(*bp++);
  	status->mtime_server = ntohl(*bp++);
  	group = make_kgid(&init_user_ns, ntohl(*bp++));
  	changed |= !gid_eq(group, status->group);
  	status->group = group;
  	bp++; /* sync counter */
  	data_version |= (u64) ntohl(*bp++) << 32;
  	EXTRACT(status->lock_count);
  	size |= (u64) ntohl(*bp++) << 32;
  	bp++; /* spare 4 */
  	*_bp = bp;
  
  	if (size != status->size) {
  		status->size = size;
  		changed |= true;
  	}
  	status->mode &= S_IALLUGO;
  
  	_debug("vnode time %lx, %lx",
  	       status->mtime_client, status->mtime_server);
  
  	if (vnode) {
  		status->parent.vid = vnode->fid.vid;
  		if (changed && !test_bit(AFS_VNODE_UNSET, &vnode->flags)) {
  			_debug("vnode changed");
  			i_size_write(&vnode->vfs_inode, size);
  			vnode->vfs_inode.i_uid = status->owner;
  			vnode->vfs_inode.i_gid = status->group;
  			vnode->vfs_inode.i_generation = vnode->fid.unique;
  			set_nlink(&vnode->vfs_inode, status->nlink);
  
  			mode = vnode->vfs_inode.i_mode;
  			mode &= ~S_IALLUGO;
  			mode |= status->mode;
  			barrier();
  			vnode->vfs_inode.i_mode = mode;
  		}
  
  		vnode->vfs_inode.i_ctime.tv_sec	= status->mtime_server;
  		vnode->vfs_inode.i_mtime	= vnode->vfs_inode.i_ctime;
  		vnode->vfs_inode.i_atime	= vnode->vfs_inode.i_ctime;
  		vnode->vfs_inode.i_version	= data_version;
  	}
  
  	expected_version = status->data_version;
  	if (store_version)
  		expected_version = *store_version;
  
  	if (expected_version != data_version) {
  		status->data_version = data_version;
  		if (vnode && !test_bit(AFS_VNODE_UNSET, &vnode->flags)) {
  			_debug("vnode modified %llx on {%x:%u}",
  			       (unsigned long long) data_version,
  			       vnode->fid.vid, vnode->fid.vnode);
  			set_bit(AFS_VNODE_MODIFIED, &vnode->flags);
  			set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
  		}
  	} else if (store_version) {
  		status->data_version = data_version;
  	}
  }
  
  /*
   * decode an AFSCallBack block
   */
  static void xdr_decode_AFSCallBack(const __be32 **_bp, struct afs_vnode *vnode)
  {
  	const __be32 *bp = *_bp;
  
  	vnode->cb_version	= ntohl(*bp++);
  	vnode->cb_expiry	= ntohl(*bp++);
  	vnode->cb_type		= ntohl(*bp++);
  	vnode->cb_expires	= vnode->cb_expiry + get_seconds();
  	*_bp = bp;
  }
  
  static void xdr_decode_AFSCallBack_raw(const __be32 **_bp,
  				       struct afs_callback *cb)
  {
  	const __be32 *bp = *_bp;
  
  	cb->version	= ntohl(*bp++);
  	cb->expiry	= ntohl(*bp++);
  	cb->type	= ntohl(*bp++);
  	*_bp = bp;
  }
  
  /*
   * decode an AFSVolSync block
   */
  static void xdr_decode_AFSVolSync(const __be32 **_bp,
  				  struct afs_volsync *volsync)
  {
  	const __be32 *bp = *_bp;
  
  	volsync->creation = ntohl(*bp++);
  	bp++; /* spare2 */
  	bp++; /* spare3 */
  	bp++; /* spare4 */
  	bp++; /* spare5 */
  	bp++; /* spare6 */
  	*_bp = bp;
  }
  
  /*
   * encode the requested attributes into an AFSStoreStatus block
   */
  static void xdr_encode_AFS_StoreStatus(__be32 **_bp, struct iattr *attr)
  {
  	__be32 *bp = *_bp;
  	u32 mask = 0, mtime = 0, owner = 0, group = 0, mode = 0;
  
  	mask = 0;
  	if (attr->ia_valid & ATTR_MTIME) {
  		mask |= AFS_SET_MTIME;
  		mtime = attr->ia_mtime.tv_sec;
  	}
  
  	if (attr->ia_valid & ATTR_UID) {
  		mask |= AFS_SET_OWNER;
  		owner = from_kuid(&init_user_ns, attr->ia_uid);
  	}
  
  	if (attr->ia_valid & ATTR_GID) {
  		mask |= AFS_SET_GROUP;
  		group = from_kgid(&init_user_ns, attr->ia_gid);
  	}
  
  	if (attr->ia_valid & ATTR_MODE) {
  		mask |= AFS_SET_MODE;
  		mode = attr->ia_mode & S_IALLUGO;
  	}
  
  	*bp++ = htonl(mask);
  	*bp++ = htonl(mtime);
  	*bp++ = htonl(owner);
  	*bp++ = htonl(group);
  	*bp++ = htonl(mode);
  	*bp++ = 0;		/* segment size */
  	*_bp = bp;
  }
  
  /*
   * decode an AFSFetchVolumeStatus block
   */
  static void xdr_decode_AFSFetchVolumeStatus(const __be32 **_bp,
  					    struct afs_volume_status *vs)
  {
  	const __be32 *bp = *_bp;
  
  	vs->vid			= ntohl(*bp++);
  	vs->parent_id		= ntohl(*bp++);
  	vs->online		= ntohl(*bp++);
  	vs->in_service		= ntohl(*bp++);
  	vs->blessed		= ntohl(*bp++);
  	vs->needs_salvage	= ntohl(*bp++);
  	vs->type		= ntohl(*bp++);
  	vs->min_quota		= ntohl(*bp++);
  	vs->max_quota		= ntohl(*bp++);
  	vs->blocks_in_use	= ntohl(*bp++);
  	vs->part_blocks_avail	= ntohl(*bp++);
  	vs->part_max_blocks	= ntohl(*bp++);
  	*_bp = bp;
  }
  
  /*
   * deliver reply data to an FS.FetchStatus
   */
  static int afs_deliver_fs_fetch_status(struct afs_call *call,
  				       struct sk_buff *skb, bool last)
  {
  	struct afs_vnode *vnode = call->reply;
  	const __be32 *bp;
  
  	_enter(",,%u", last);
  
  	afs_transfer_reply(call, skb);
  	if (!last)
  		return 0;
  
  	if (call->reply_size != call->reply_max)
  		return -EBADMSG;
  
  	/* unmarshall the reply once we've received all of it */
  	bp = call->buffer;
  	xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
  	xdr_decode_AFSCallBack(&bp, vnode);
  	if (call->reply2)
  		xdr_decode_AFSVolSync(&bp, call->reply2);
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.FetchStatus operation type
   */
  static const struct afs_call_type afs_RXFSFetchStatus = {
  	.name		= "FS.FetchStatus",
  	.deliver	= afs_deliver_fs_fetch_status,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * fetch the status information for a file
   */
  int afs_fs_fetch_file_status(struct afs_server *server,
  			     struct key *key,
  			     struct afs_vnode *vnode,
  			     struct afs_volsync *volsync,
  			     const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  
  	_enter(",%x,{%x:%u},,",
  	       key_serial(key), vnode->fid.vid, vnode->fid.vnode);
  
  	call = afs_alloc_flat_call(&afs_RXFSFetchStatus, 16, (21 + 3 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->reply2 = volsync;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	bp[0] = htonl(FSFETCHSTATUS);
  	bp[1] = htonl(vnode->fid.vid);
  	bp[2] = htonl(vnode->fid.vnode);
  	bp[3] = htonl(vnode->fid.unique);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.FetchData
   */
  static int afs_deliver_fs_fetch_data(struct afs_call *call,
  				     struct sk_buff *skb, bool last)
  {
  	struct afs_vnode *vnode = call->reply;
  	const __be32 *bp;
  	struct page *page;
  	void *buffer;
  	int ret;
  
  	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
  
  	switch (call->unmarshall) {
  	case 0:
  		call->offset = 0;
  		call->unmarshall++;
  		if (call->operation_ID != FSFETCHDATA64) {
  			call->unmarshall++;
  			goto no_msw;
  		}
  
  		/* extract the upper part of the returned data length of an
  		 * FSFETCHDATA64 op (which should always be 0 using this
  		 * client) */
  	case 1:
  		_debug("extract data length (MSW)");
  		ret = afs_extract_data(call, skb, last, &call->tmp, 4);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		call->count = ntohl(call->tmp);
  		_debug("DATA length MSW: %u", call->count);
  		if (call->count > 0)
  			return -EBADMSG;
  		call->offset = 0;
  		call->unmarshall++;
  
  	no_msw:
  		/* extract the returned data length */
  	case 2:
  		_debug("extract data length");
  		ret = afs_extract_data(call, skb, last, &call->tmp, 4);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		call->count = ntohl(call->tmp);
  		_debug("DATA length: %u", call->count);
  		if (call->count > PAGE_SIZE)
  			return -EBADMSG;
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the returned data */
  	case 3:
  		_debug("extract data");
  		if (call->count > 0) {
  			page = call->reply3;
  			buffer = kmap_atomic(page);
  			ret = afs_extract_data(call, skb, last, buffer,
  					       call->count);
  			kunmap_atomic(buffer);
  			switch (ret) {
  			case 0:		break;
  			case -EAGAIN:	return 0;
  			default:	return ret;
  			}
  		}
  
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the metadata */
  	case 4:
  		ret = afs_extract_data(call, skb, last, call->buffer,
  				       (21 + 3 + 6) * 4);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		bp = call->buffer;
  		xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
  		xdr_decode_AFSCallBack(&bp, vnode);
  		if (call->reply2)
  			xdr_decode_AFSVolSync(&bp, call->reply2);
  
  		call->offset = 0;
  		call->unmarshall++;
  
  	case 5:
  		_debug("trailer");
  		if (skb->len != 0)
  			return -EBADMSG;
  		break;
  	}
  
  	if (!last)
  		return 0;
  
  	if (call->count < PAGE_SIZE) {
  		_debug("clear");
  		page = call->reply3;
  		buffer = kmap_atomic(page);
  		memset(buffer + call->count, 0, PAGE_SIZE - call->count);
  		kunmap_atomic(buffer);
  	}
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.FetchData operation type
   */
  static const struct afs_call_type afs_RXFSFetchData = {
  	.name		= "FS.FetchData",
  	.deliver	= afs_deliver_fs_fetch_data,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  static const struct afs_call_type afs_RXFSFetchData64 = {
  	.name		= "FS.FetchData64",
  	.deliver	= afs_deliver_fs_fetch_data,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * fetch data from a very large file
   */
  static int afs_fs_fetch_data64(struct afs_server *server,
  			       struct key *key,
  			       struct afs_vnode *vnode,
  			       off_t offset, size_t length,
  			       struct page *buffer,
  			       const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  
  	_enter("");
  
  	ASSERTCMP(length, <, ULONG_MAX);
  
  	call = afs_alloc_flat_call(&afs_RXFSFetchData64, 32, (21 + 3 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->reply2 = NULL; /* volsync */
  	call->reply3 = buffer;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  	call->operation_ID = FSFETCHDATA64;
  
  	/* marshall the parameters */
  	bp = call->request;
  	bp[0] = htonl(FSFETCHDATA64);
  	bp[1] = htonl(vnode->fid.vid);
  	bp[2] = htonl(vnode->fid.vnode);
  	bp[3] = htonl(vnode->fid.unique);
  	bp[4] = htonl(upper_32_bits(offset));
  	bp[5] = htonl((u32) offset);
  	bp[6] = 0;
  	bp[7] = htonl((u32) length);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * fetch data from a file
   */
  int afs_fs_fetch_data(struct afs_server *server,
  		      struct key *key,
  		      struct afs_vnode *vnode,
  		      off_t offset, size_t length,
  		      struct page *buffer,
  		      const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  
  	if (upper_32_bits(offset) || upper_32_bits(offset + length))
  		return afs_fs_fetch_data64(server, key, vnode, offset, length,
  					   buffer, wait_mode);
  
  	_enter("");
  
  	call = afs_alloc_flat_call(&afs_RXFSFetchData, 24, (21 + 3 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->reply2 = NULL; /* volsync */
  	call->reply3 = buffer;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  	call->operation_ID = FSFETCHDATA;
  
  	/* marshall the parameters */
  	bp = call->request;
  	bp[0] = htonl(FSFETCHDATA);
  	bp[1] = htonl(vnode->fid.vid);
  	bp[2] = htonl(vnode->fid.vnode);
  	bp[3] = htonl(vnode->fid.unique);
  	bp[4] = htonl(offset);
  	bp[5] = htonl(length);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.GiveUpCallBacks
   */
  static int afs_deliver_fs_give_up_callbacks(struct afs_call *call,
  					    struct sk_buff *skb, bool last)
  {
  	_enter(",{%u},%d", skb->len, last);
  
  	if (skb->len > 0)
  		return -EBADMSG; /* shouldn't be any reply data */
  	return 0;
  }
  
  /*
   * FS.GiveUpCallBacks operation type
   */
  static const struct afs_call_type afs_RXFSGiveUpCallBacks = {
  	.name		= "FS.GiveUpCallBacks",
  	.deliver	= afs_deliver_fs_give_up_callbacks,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * give up a set of callbacks
   * - the callbacks are held in the server->cb_break ring
   */
  int afs_fs_give_up_callbacks(struct afs_server *server,
  			     const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	size_t ncallbacks;
  	__be32 *bp, *tp;
  	int loop;
  
  	ncallbacks = CIRC_CNT(server->cb_break_head, server->cb_break_tail,
  			      ARRAY_SIZE(server->cb_break));
  
  	_enter("{%zu},", ncallbacks);
  
  	if (ncallbacks == 0)
  		return 0;
  	if (ncallbacks > AFSCBMAX)
  		ncallbacks = AFSCBMAX;
  
  	_debug("break %zu callbacks", ncallbacks);
  
  	call = afs_alloc_flat_call(&afs_RXFSGiveUpCallBacks,
  				   12 + ncallbacks * 6 * 4, 0);
  	if (!call)
  		return -ENOMEM;
  
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	tp = bp + 2 + ncallbacks * 3;
  	*bp++ = htonl(FSGIVEUPCALLBACKS);
  	*bp++ = htonl(ncallbacks);
  	*tp++ = htonl(ncallbacks);
  
  	atomic_sub(ncallbacks, &server->cb_break_n);
  	for (loop = ncallbacks; loop > 0; loop--) {
  		struct afs_callback *cb =
  			&server->cb_break[server->cb_break_tail];
  
  		*bp++ = htonl(cb->fid.vid);
  		*bp++ = htonl(cb->fid.vnode);
  		*bp++ = htonl(cb->fid.unique);
  		*tp++ = htonl(cb->version);
  		*tp++ = htonl(cb->expiry);
  		*tp++ = htonl(cb->type);
  		smp_mb();
  		server->cb_break_tail =
  			(server->cb_break_tail + 1) &
  			(ARRAY_SIZE(server->cb_break) - 1);
  	}
  
  	ASSERT(ncallbacks > 0);
  	wake_up_nr(&server->cb_break_waitq, ncallbacks);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.CreateFile or an FS.MakeDir
   */
  static int afs_deliver_fs_create_vnode(struct afs_call *call,
  				       struct sk_buff *skb, bool last)
  {
  	struct afs_vnode *vnode = call->reply;
  	const __be32 *bp;
  
  	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
  
  	afs_transfer_reply(call, skb);
  	if (!last)
  		return 0;
  
  	if (call->reply_size != call->reply_max)
  		return -EBADMSG;
  
  	/* unmarshall the reply once we've received all of it */
  	bp = call->buffer;
  	xdr_decode_AFSFid(&bp, call->reply2);
  	xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL, NULL);
  	xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
  	xdr_decode_AFSCallBack_raw(&bp, call->reply4);
  	/* xdr_decode_AFSVolSync(&bp, call->replyX); */
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.CreateFile and FS.MakeDir operation type
   */
  static const struct afs_call_type afs_RXFSCreateXXXX = {
  	.name		= "FS.CreateXXXX",
  	.deliver	= afs_deliver_fs_create_vnode,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * create a file or make a directory
   */
  int afs_fs_create(struct afs_server *server,
  		  struct key *key,
  		  struct afs_vnode *vnode,
  		  const char *name,
  		  umode_t mode,
  		  struct afs_fid *newfid,
  		  struct afs_file_status *newstatus,
  		  struct afs_callback *newcb,
  		  const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	size_t namesz, reqsz, padsz;
  	__be32 *bp;
  
  	_enter("");
  
  	namesz = strlen(name);
  	padsz = (4 - (namesz & 3)) & 3;
  	reqsz = (5 * 4) + namesz + padsz + (6 * 4);
  
  	call = afs_alloc_flat_call(&afs_RXFSCreateXXXX, reqsz,
  				   (3 + 21 + 21 + 3 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->reply2 = newfid;
  	call->reply3 = newstatus;
  	call->reply4 = newcb;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(S_ISDIR(mode) ? FSMAKEDIR : FSCREATEFILE);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  	*bp++ = htonl(namesz);
  	memcpy(bp, name, namesz);
  	bp = (void *) bp + namesz;
  	if (padsz > 0) {
  		memset(bp, 0, padsz);
  		bp = (void *) bp + padsz;
  	}
  	*bp++ = htonl(AFS_SET_MODE);
  	*bp++ = 0; /* mtime */
  	*bp++ = 0; /* owner */
  	*bp++ = 0; /* group */
  	*bp++ = htonl(mode & S_IALLUGO); /* unix mode */
  	*bp++ = 0; /* segment size */
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.RemoveFile or FS.RemoveDir
   */
  static int afs_deliver_fs_remove(struct afs_call *call,
  				 struct sk_buff *skb, bool last)
  {
  	struct afs_vnode *vnode = call->reply;
  	const __be32 *bp;
  
  	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
  
  	afs_transfer_reply(call, skb);
  	if (!last)
  		return 0;
  
  	if (call->reply_size != call->reply_max)
  		return -EBADMSG;
  
  	/* unmarshall the reply once we've received all of it */
  	bp = call->buffer;
  	xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
  	/* xdr_decode_AFSVolSync(&bp, call->replyX); */
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.RemoveDir/FS.RemoveFile operation type
   */
  static const struct afs_call_type afs_RXFSRemoveXXXX = {
  	.name		= "FS.RemoveXXXX",
  	.deliver	= afs_deliver_fs_remove,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * remove a file or directory
   */
  int afs_fs_remove(struct afs_server *server,
  		  struct key *key,
  		  struct afs_vnode *vnode,
  		  const char *name,
  		  bool isdir,
  		  const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	size_t namesz, reqsz, padsz;
  	__be32 *bp;
  
  	_enter("");
  
  	namesz = strlen(name);
  	padsz = (4 - (namesz & 3)) & 3;
  	reqsz = (5 * 4) + namesz + padsz;
  
  	call = afs_alloc_flat_call(&afs_RXFSRemoveXXXX, reqsz, (21 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(isdir ? FSREMOVEDIR : FSREMOVEFILE);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  	*bp++ = htonl(namesz);
  	memcpy(bp, name, namesz);
  	bp = (void *) bp + namesz;
  	if (padsz > 0) {
  		memset(bp, 0, padsz);
  		bp = (void *) bp + padsz;
  	}
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.Link
   */
  static int afs_deliver_fs_link(struct afs_call *call,
  			       struct sk_buff *skb, bool last)
  {
  	struct afs_vnode *dvnode = call->reply, *vnode = call->reply2;
  	const __be32 *bp;
  
  	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
  
  	afs_transfer_reply(call, skb);
  	if (!last)
  		return 0;
  
  	if (call->reply_size != call->reply_max)
  		return -EBADMSG;
  
  	/* unmarshall the reply once we've received all of it */
  	bp = call->buffer;
  	xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
  	xdr_decode_AFSFetchStatus(&bp, &dvnode->status, dvnode, NULL);
  	/* xdr_decode_AFSVolSync(&bp, call->replyX); */
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.Link operation type
   */
  static const struct afs_call_type afs_RXFSLink = {
  	.name		= "FS.Link",
  	.deliver	= afs_deliver_fs_link,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * make a hard link
   */
  int afs_fs_link(struct afs_server *server,
  		struct key *key,
  		struct afs_vnode *dvnode,
  		struct afs_vnode *vnode,
  		const char *name,
  		const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	size_t namesz, reqsz, padsz;
  	__be32 *bp;
  
  	_enter("");
  
  	namesz = strlen(name);
  	padsz = (4 - (namesz & 3)) & 3;
  	reqsz = (5 * 4) + namesz + padsz + (3 * 4);
  
  	call = afs_alloc_flat_call(&afs_RXFSLink, reqsz, (21 + 21 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = dvnode;
  	call->reply2 = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSLINK);
  	*bp++ = htonl(dvnode->fid.vid);
  	*bp++ = htonl(dvnode->fid.vnode);
  	*bp++ = htonl(dvnode->fid.unique);
  	*bp++ = htonl(namesz);
  	memcpy(bp, name, namesz);
  	bp = (void *) bp + namesz;
  	if (padsz > 0) {
  		memset(bp, 0, padsz);
  		bp = (void *) bp + padsz;
  	}
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.Symlink
   */
  static int afs_deliver_fs_symlink(struct afs_call *call,
  				  struct sk_buff *skb, bool last)
  {
  	struct afs_vnode *vnode = call->reply;
  	const __be32 *bp;
  
  	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
  
  	afs_transfer_reply(call, skb);
  	if (!last)
  		return 0;
  
  	if (call->reply_size != call->reply_max)
  		return -EBADMSG;
  
  	/* unmarshall the reply once we've received all of it */
  	bp = call->buffer;
  	xdr_decode_AFSFid(&bp, call->reply2);
  	xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL, NULL);
  	xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, NULL);
  	/* xdr_decode_AFSVolSync(&bp, call->replyX); */
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.Symlink operation type
   */
  static const struct afs_call_type afs_RXFSSymlink = {
  	.name		= "FS.Symlink",
  	.deliver	= afs_deliver_fs_symlink,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * create a symbolic link
   */
  int afs_fs_symlink(struct afs_server *server,
  		   struct key *key,
  		   struct afs_vnode *vnode,
  		   const char *name,
  		   const char *contents,
  		   struct afs_fid *newfid,
  		   struct afs_file_status *newstatus,
  		   const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	size_t namesz, reqsz, padsz, c_namesz, c_padsz;
  	__be32 *bp;
  
  	_enter("");
  
  	namesz = strlen(name);
  	padsz = (4 - (namesz & 3)) & 3;
  
  	c_namesz = strlen(contents);
  	c_padsz = (4 - (c_namesz & 3)) & 3;
  
  	reqsz = (6 * 4) + namesz + padsz + c_namesz + c_padsz + (6 * 4);
  
  	call = afs_alloc_flat_call(&afs_RXFSSymlink, reqsz,
  				   (3 + 21 + 21 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->reply2 = newfid;
  	call->reply3 = newstatus;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSSYMLINK);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  	*bp++ = htonl(namesz);
  	memcpy(bp, name, namesz);
  	bp = (void *) bp + namesz;
  	if (padsz > 0) {
  		memset(bp, 0, padsz);
  		bp = (void *) bp + padsz;
  	}
  	*bp++ = htonl(c_namesz);
  	memcpy(bp, contents, c_namesz);
  	bp = (void *) bp + c_namesz;
  	if (c_padsz > 0) {
  		memset(bp, 0, c_padsz);
  		bp = (void *) bp + c_padsz;
  	}
  	*bp++ = htonl(AFS_SET_MODE);
  	*bp++ = 0; /* mtime */
  	*bp++ = 0; /* owner */
  	*bp++ = 0; /* group */
  	*bp++ = htonl(S_IRWXUGO); /* unix mode */
  	*bp++ = 0; /* segment size */
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.Rename
   */
  static int afs_deliver_fs_rename(struct afs_call *call,
  				  struct sk_buff *skb, bool last)
  {
  	struct afs_vnode *orig_dvnode = call->reply, *new_dvnode = call->reply2;
  	const __be32 *bp;
  
  	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
  
  	afs_transfer_reply(call, skb);
  	if (!last)
  		return 0;
  
  	if (call->reply_size != call->reply_max)
  		return -EBADMSG;
  
  	/* unmarshall the reply once we've received all of it */
  	bp = call->buffer;
  	xdr_decode_AFSFetchStatus(&bp, &orig_dvnode->status, orig_dvnode, NULL);
  	if (new_dvnode != orig_dvnode)
  		xdr_decode_AFSFetchStatus(&bp, &new_dvnode->status, new_dvnode,
  					  NULL);
  	/* xdr_decode_AFSVolSync(&bp, call->replyX); */
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.Rename operation type
   */
  static const struct afs_call_type afs_RXFSRename = {
  	.name		= "FS.Rename",
  	.deliver	= afs_deliver_fs_rename,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * create a symbolic link
   */
  int afs_fs_rename(struct afs_server *server,
  		  struct key *key,
  		  struct afs_vnode *orig_dvnode,
  		  const char *orig_name,
  		  struct afs_vnode *new_dvnode,
  		  const char *new_name,
  		  const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	size_t reqsz, o_namesz, o_padsz, n_namesz, n_padsz;
  	__be32 *bp;
  
  	_enter("");
  
  	o_namesz = strlen(orig_name);
  	o_padsz = (4 - (o_namesz & 3)) & 3;
  
  	n_namesz = strlen(new_name);
  	n_padsz = (4 - (n_namesz & 3)) & 3;
  
  	reqsz = (4 * 4) +
  		4 + o_namesz + o_padsz +
  		(3 * 4) +
  		4 + n_namesz + n_padsz;
  
  	call = afs_alloc_flat_call(&afs_RXFSRename, reqsz, (21 + 21 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = orig_dvnode;
  	call->reply2 = new_dvnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSRENAME);
  	*bp++ = htonl(orig_dvnode->fid.vid);
  	*bp++ = htonl(orig_dvnode->fid.vnode);
  	*bp++ = htonl(orig_dvnode->fid.unique);
  	*bp++ = htonl(o_namesz);
  	memcpy(bp, orig_name, o_namesz);
  	bp = (void *) bp + o_namesz;
  	if (o_padsz > 0) {
  		memset(bp, 0, o_padsz);
  		bp = (void *) bp + o_padsz;
  	}
  
  	*bp++ = htonl(new_dvnode->fid.vid);
  	*bp++ = htonl(new_dvnode->fid.vnode);
  	*bp++ = htonl(new_dvnode->fid.unique);
  	*bp++ = htonl(n_namesz);
  	memcpy(bp, new_name, n_namesz);
  	bp = (void *) bp + n_namesz;
  	if (n_padsz > 0) {
  		memset(bp, 0, n_padsz);
  		bp = (void *) bp + n_padsz;
  	}
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.StoreData
   */
  static int afs_deliver_fs_store_data(struct afs_call *call,
  				     struct sk_buff *skb, bool last)
  {
  	struct afs_vnode *vnode = call->reply;
  	const __be32 *bp;
  
  	_enter(",,%u", last);
  
  	afs_transfer_reply(call, skb);
  	if (!last) {
  		_leave(" = 0 [more]");
  		return 0;
  	}
  
  	if (call->reply_size != call->reply_max) {
  		_leave(" = -EBADMSG [%u != %u]",
  		       call->reply_size, call->reply_max);
  		return -EBADMSG;
  	}
  
  	/* unmarshall the reply once we've received all of it */
  	bp = call->buffer;
  	xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode,
  				  &call->store_version);
  	/* xdr_decode_AFSVolSync(&bp, call->replyX); */
  
  	afs_pages_written_back(vnode, call);
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.StoreData operation type
   */
  static const struct afs_call_type afs_RXFSStoreData = {
  	.name		= "FS.StoreData",
  	.deliver	= afs_deliver_fs_store_data,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  static const struct afs_call_type afs_RXFSStoreData64 = {
  	.name		= "FS.StoreData64",
  	.deliver	= afs_deliver_fs_store_data,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * store a set of pages to a very large file
   */
  static int afs_fs_store_data64(struct afs_server *server,
  			       struct afs_writeback *wb,
  			       pgoff_t first, pgoff_t last,
  			       unsigned offset, unsigned to,
  			       loff_t size, loff_t pos, loff_t i_size,
  			       const struct afs_wait_mode *wait_mode)
  {
  	struct afs_vnode *vnode = wb->vnode;
  	struct afs_call *call;
  	__be32 *bp;
  
  	_enter(",%x,{%x:%u},,",
  	       key_serial(wb->key), vnode->fid.vid, vnode->fid.vnode);
  
  	call = afs_alloc_flat_call(&afs_RXFSStoreData64,
  				   (4 + 6 + 3 * 2) * 4,
  				   (21 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->wb = wb;
  	call->key = wb->key;
  	call->reply = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  	call->mapping = vnode->vfs_inode.i_mapping;
  	call->first = first;
  	call->last = last;
  	call->first_offset = offset;
  	call->last_to = to;
  	call->send_pages = true;
  	call->store_version = vnode->status.data_version + 1;
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSSTOREDATA64);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  
  	*bp++ = 0; /* mask */
  	*bp++ = 0; /* mtime */
  	*bp++ = 0; /* owner */
  	*bp++ = 0; /* group */
  	*bp++ = 0; /* unix mode */
  	*bp++ = 0; /* segment size */
  
  	*bp++ = htonl(pos >> 32);
  	*bp++ = htonl((u32) pos);
  	*bp++ = htonl(size >> 32);
  	*bp++ = htonl((u32) size);
  	*bp++ = htonl(i_size >> 32);
  	*bp++ = htonl((u32) i_size);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * store a set of pages
   */
  int afs_fs_store_data(struct afs_server *server, struct afs_writeback *wb,
  		      pgoff_t first, pgoff_t last,
  		      unsigned offset, unsigned to,
  		      const struct afs_wait_mode *wait_mode)
  {
  	struct afs_vnode *vnode = wb->vnode;
  	struct afs_call *call;
  	loff_t size, pos, i_size;
  	__be32 *bp;
  
  	_enter(",%x,{%x:%u},,",
  	       key_serial(wb->key), vnode->fid.vid, vnode->fid.vnode);
  
  	size = to - offset;
  	if (first != last)
  		size += (loff_t)(last - first) << PAGE_SHIFT;
  	pos = (loff_t)first << PAGE_SHIFT;
  	pos += offset;
  
  	i_size = i_size_read(&vnode->vfs_inode);
  	if (pos + size > i_size)
  		i_size = size + pos;
  
  	_debug("size %llx, at %llx, i_size %llx",
  	       (unsigned long long) size, (unsigned long long) pos,
  	       (unsigned long long) i_size);
  
  	if (pos >> 32 || i_size >> 32 || size >> 32 || (pos + size) >> 32)
  		return afs_fs_store_data64(server, wb, first, last, offset, to,
  					   size, pos, i_size, wait_mode);
  
  	call = afs_alloc_flat_call(&afs_RXFSStoreData,
  				   (4 + 6 + 3) * 4,
  				   (21 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->wb = wb;
  	call->key = wb->key;
  	call->reply = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  	call->mapping = vnode->vfs_inode.i_mapping;
  	call->first = first;
  	call->last = last;
  	call->first_offset = offset;
  	call->last_to = to;
  	call->send_pages = true;
  	call->store_version = vnode->status.data_version + 1;
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSSTOREDATA);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  
  	*bp++ = 0; /* mask */
  	*bp++ = 0; /* mtime */
  	*bp++ = 0; /* owner */
  	*bp++ = 0; /* group */
  	*bp++ = 0; /* unix mode */
  	*bp++ = 0; /* segment size */
  
  	*bp++ = htonl(pos);
  	*bp++ = htonl(size);
  	*bp++ = htonl(i_size);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.StoreStatus
   */
  static int afs_deliver_fs_store_status(struct afs_call *call,
  				       struct sk_buff *skb, bool last)
  {
  	afs_dataversion_t *store_version;
  	struct afs_vnode *vnode = call->reply;
  	const __be32 *bp;
  
  	_enter(",,%u", last);
  
  	afs_transfer_reply(call, skb);
  	if (!last) {
  		_leave(" = 0 [more]");
  		return 0;
  	}
  
  	if (call->reply_size != call->reply_max) {
  		_leave(" = -EBADMSG [%u != %u]",
  		       call->reply_size, call->reply_max);
  		return -EBADMSG;
  	}
  
  	/* unmarshall the reply once we've received all of it */
  	store_version = NULL;
  	if (call->operation_ID == FSSTOREDATA)
  		store_version = &call->store_version;
  
  	bp = call->buffer;
  	xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode, store_version);
  	/* xdr_decode_AFSVolSync(&bp, call->replyX); */
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.StoreStatus operation type
   */
  static const struct afs_call_type afs_RXFSStoreStatus = {
  	.name		= "FS.StoreStatus",
  	.deliver	= afs_deliver_fs_store_status,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  static const struct afs_call_type afs_RXFSStoreData_as_Status = {
  	.name		= "FS.StoreData",
  	.deliver	= afs_deliver_fs_store_status,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  static const struct afs_call_type afs_RXFSStoreData64_as_Status = {
  	.name		= "FS.StoreData64",
  	.deliver	= afs_deliver_fs_store_status,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * set the attributes on a very large file, using FS.StoreData rather than
   * FS.StoreStatus so as to alter the file size also
   */
  static int afs_fs_setattr_size64(struct afs_server *server, struct key *key,
  				 struct afs_vnode *vnode, struct iattr *attr,
  				 const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  
  	_enter(",%x,{%x:%u},,",
  	       key_serial(key), vnode->fid.vid, vnode->fid.vnode);
  
  	ASSERT(attr->ia_valid & ATTR_SIZE);
  
  	call = afs_alloc_flat_call(&afs_RXFSStoreData64_as_Status,
  				   (4 + 6 + 3 * 2) * 4,
  				   (21 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  	call->store_version = vnode->status.data_version + 1;
  	call->operation_ID = FSSTOREDATA;
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSSTOREDATA64);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  
  	xdr_encode_AFS_StoreStatus(&bp, attr);
  
  	*bp++ = 0;				/* position of start of write */
  	*bp++ = 0;
  	*bp++ = 0;				/* size of write */
  	*bp++ = 0;
  	*bp++ = htonl(attr->ia_size >> 32);	/* new file length */
  	*bp++ = htonl((u32) attr->ia_size);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * set the attributes on a file, using FS.StoreData rather than FS.StoreStatus
   * so as to alter the file size also
   */
  static int afs_fs_setattr_size(struct afs_server *server, struct key *key,
  			       struct afs_vnode *vnode, struct iattr *attr,
  			       const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  
  	_enter(",%x,{%x:%u},,",
  	       key_serial(key), vnode->fid.vid, vnode->fid.vnode);
  
  	ASSERT(attr->ia_valid & ATTR_SIZE);
  	if (attr->ia_size >> 32)
  		return afs_fs_setattr_size64(server, key, vnode, attr,
  					     wait_mode);
  
  	call = afs_alloc_flat_call(&afs_RXFSStoreData_as_Status,
  				   (4 + 6 + 3) * 4,
  				   (21 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  	call->store_version = vnode->status.data_version + 1;
  	call->operation_ID = FSSTOREDATA;
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSSTOREDATA);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  
  	xdr_encode_AFS_StoreStatus(&bp, attr);
  
  	*bp++ = 0;				/* position of start of write */
  	*bp++ = 0;				/* size of write */
  	*bp++ = htonl(attr->ia_size);		/* new file length */
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * set the attributes on a file, using FS.StoreData if there's a change in file
   * size, and FS.StoreStatus otherwise
   */
  int afs_fs_setattr(struct afs_server *server, struct key *key,
  		   struct afs_vnode *vnode, struct iattr *attr,
  		   const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  
  	if (attr->ia_valid & ATTR_SIZE)
  		return afs_fs_setattr_size(server, key, vnode, attr,
  					   wait_mode);
  
  	_enter(",%x,{%x:%u},,",
  	       key_serial(key), vnode->fid.vid, vnode->fid.vnode);
  
  	call = afs_alloc_flat_call(&afs_RXFSStoreStatus,
  				   (4 + 6) * 4,
  				   (21 + 6) * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  	call->operation_ID = FSSTORESTATUS;
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSSTORESTATUS);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  
  	xdr_encode_AFS_StoreStatus(&bp, attr);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.GetVolumeStatus
   */
  static int afs_deliver_fs_get_volume_status(struct afs_call *call,
  					    struct sk_buff *skb, bool last)
  {
  	const __be32 *bp;
  	char *p;
  	int ret;
  
  	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
  
  	switch (call->unmarshall) {
  	case 0:
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the returned status record */
  	case 1:
  		_debug("extract status");
  		ret = afs_extract_data(call, skb, last, call->buffer,
  				       12 * 4);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		bp = call->buffer;
  		xdr_decode_AFSFetchVolumeStatus(&bp, call->reply2);
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the volume name length */
  	case 2:
  		ret = afs_extract_data(call, skb, last, &call->tmp, 4);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		call->count = ntohl(call->tmp);
  		_debug("volname length: %u", call->count);
  		if (call->count >= AFSNAMEMAX)
  			return -EBADMSG;
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the volume name */
  	case 3:
  		_debug("extract volname");
  		if (call->count > 0) {
  			ret = afs_extract_data(call, skb, last, call->reply3,
  					       call->count);
  			switch (ret) {
  			case 0:		break;
  			case -EAGAIN:	return 0;
  			default:	return ret;
  			}
  		}
  
  		p = call->reply3;
  		p[call->count] = 0;
  		_debug("volname '%s'", p);
  
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the volume name padding */
  		if ((call->count & 3) == 0) {
  			call->unmarshall++;
  			goto no_volname_padding;
  		}
  		call->count = 4 - (call->count & 3);
  
  	case 4:
  		ret = afs_extract_data(call, skb, last, call->buffer,
  				       call->count);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		call->offset = 0;
  		call->unmarshall++;
  	no_volname_padding:
  
  		/* extract the offline message length */
  	case 5:
  		ret = afs_extract_data(call, skb, last, &call->tmp, 4);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		call->count = ntohl(call->tmp);
  		_debug("offline msg length: %u", call->count);
  		if (call->count >= AFSNAMEMAX)
  			return -EBADMSG;
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the offline message */
  	case 6:
  		_debug("extract offline");
  		if (call->count > 0) {
  			ret = afs_extract_data(call, skb, last, call->reply3,
  					       call->count);
  			switch (ret) {
  			case 0:		break;
  			case -EAGAIN:	return 0;
  			default:	return ret;
  			}
  		}
  
  		p = call->reply3;
  		p[call->count] = 0;
  		_debug("offline '%s'", p);
  
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the offline message padding */
  		if ((call->count & 3) == 0) {
  			call->unmarshall++;
  			goto no_offline_padding;
  		}
  		call->count = 4 - (call->count & 3);
  
  	case 7:
  		ret = afs_extract_data(call, skb, last, call->buffer,
  				       call->count);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		call->offset = 0;
  		call->unmarshall++;
  	no_offline_padding:
  
  		/* extract the message of the day length */
  	case 8:
  		ret = afs_extract_data(call, skb, last, &call->tmp, 4);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		call->count = ntohl(call->tmp);
  		_debug("motd length: %u", call->count);
  		if (call->count >= AFSNAMEMAX)
  			return -EBADMSG;
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the message of the day */
  	case 9:
  		_debug("extract motd");
  		if (call->count > 0) {
  			ret = afs_extract_data(call, skb, last, call->reply3,
  					       call->count);
  			switch (ret) {
  			case 0:		break;
  			case -EAGAIN:	return 0;
  			default:	return ret;
  			}
  		}
  
  		p = call->reply3;
  		p[call->count] = 0;
  		_debug("motd '%s'", p);
  
  		call->offset = 0;
  		call->unmarshall++;
  
  		/* extract the message of the day padding */
  		if ((call->count & 3) == 0) {
  			call->unmarshall++;
  			goto no_motd_padding;
  		}
  		call->count = 4 - (call->count & 3);
  
  	case 10:
  		ret = afs_extract_data(call, skb, last, call->buffer,
  				       call->count);
  		switch (ret) {
  		case 0:		break;
  		case -EAGAIN:	return 0;
  		default:	return ret;
  		}
  
  		call->offset = 0;
  		call->unmarshall++;
  	no_motd_padding:
  
  	case 11:
  		_debug("trailer %d", skb->len);
  		if (skb->len != 0)
  			return -EBADMSG;
  		break;
  	}
  
  	if (!last)
  		return 0;
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * destroy an FS.GetVolumeStatus call
   */
  static void afs_get_volume_status_call_destructor(struct afs_call *call)
  {
  	kfree(call->reply3);
  	call->reply3 = NULL;
  	afs_flat_call_destructor(call);
  }
  
  /*
   * FS.GetVolumeStatus operation type
   */
  static const struct afs_call_type afs_RXFSGetVolumeStatus = {
  	.name		= "FS.GetVolumeStatus",
  	.deliver	= afs_deliver_fs_get_volume_status,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_get_volume_status_call_destructor,
  };
  
  /*
   * fetch the status of a volume
   */
  int afs_fs_get_volume_status(struct afs_server *server,
  			     struct key *key,
  			     struct afs_vnode *vnode,
  			     struct afs_volume_status *vs,
  			     const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  	void *tmpbuf;
  
  	_enter("");
  
  	tmpbuf = kmalloc(AFSOPAQUEMAX, GFP_KERNEL);
  	if (!tmpbuf)
  		return -ENOMEM;
  
  	call = afs_alloc_flat_call(&afs_RXFSGetVolumeStatus, 2 * 4, 12 * 4);
  	if (!call) {
  		kfree(tmpbuf);
  		return -ENOMEM;
  	}
  
  	call->key = key;
  	call->reply = vnode;
  	call->reply2 = vs;
  	call->reply3 = tmpbuf;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	bp[0] = htonl(FSGETVOLUMESTATUS);
  	bp[1] = htonl(vnode->fid.vid);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * deliver reply data to an FS.SetLock, FS.ExtendLock or FS.ReleaseLock
   */
  static int afs_deliver_fs_xxxx_lock(struct afs_call *call,
  				    struct sk_buff *skb, bool last)
  {
  	const __be32 *bp;
  
  	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
  
  	afs_transfer_reply(call, skb);
  	if (!last)
  		return 0;
  
  	if (call->reply_size != call->reply_max)
  		return -EBADMSG;
  
  	/* unmarshall the reply once we've received all of it */
  	bp = call->buffer;
  	/* xdr_decode_AFSVolSync(&bp, call->replyX); */
  
  	_leave(" = 0 [done]");
  	return 0;
  }
  
  /*
   * FS.SetLock operation type
   */
  static const struct afs_call_type afs_RXFSSetLock = {
  	.name		= "FS.SetLock",
  	.deliver	= afs_deliver_fs_xxxx_lock,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * FS.ExtendLock operation type
   */
  static const struct afs_call_type afs_RXFSExtendLock = {
  	.name		= "FS.ExtendLock",
  	.deliver	= afs_deliver_fs_xxxx_lock,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * FS.ReleaseLock operation type
   */
  static const struct afs_call_type afs_RXFSReleaseLock = {
  	.name		= "FS.ReleaseLock",
  	.deliver	= afs_deliver_fs_xxxx_lock,
  	.abort_to_error	= afs_abort_to_error,
  	.destructor	= afs_flat_call_destructor,
  };
  
  /*
   * get a lock on a file
   */
  int afs_fs_set_lock(struct afs_server *server,
  		    struct key *key,
  		    struct afs_vnode *vnode,
  		    afs_lock_type_t type,
  		    const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  
  	_enter("");
  
  	call = afs_alloc_flat_call(&afs_RXFSSetLock, 5 * 4, 6 * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSSETLOCK);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  	*bp++ = htonl(type);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * extend a lock on a file
   */
  int afs_fs_extend_lock(struct afs_server *server,
  		       struct key *key,
  		       struct afs_vnode *vnode,
  		       const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  
  	_enter("");
  
  	call = afs_alloc_flat_call(&afs_RXFSExtendLock, 4 * 4, 6 * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSEXTENDLOCK);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  
  /*
   * release a lock on a file
   */
  int afs_fs_release_lock(struct afs_server *server,
  			struct key *key,
  			struct afs_vnode *vnode,
  			const struct afs_wait_mode *wait_mode)
  {
  	struct afs_call *call;
  	__be32 *bp;
  
  	_enter("");
  
  	call = afs_alloc_flat_call(&afs_RXFSReleaseLock, 4 * 4, 6 * 4);
  	if (!call)
  		return -ENOMEM;
  
  	call->key = key;
  	call->reply = vnode;
  	call->service_id = FS_SERVICE;
  	call->port = htons(AFS_FS_PORT);
  
  	/* marshall the parameters */
  	bp = call->request;
  	*bp++ = htonl(FSRELEASELOCK);
  	*bp++ = htonl(vnode->fid.vid);
  	*bp++ = htonl(vnode->fid.vnode);
  	*bp++ = htonl(vnode->fid.unique);
  
  	return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
  }
  