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d001648ec7
Don't expose skbs to in-kernel users, such as the AFS filesystem, but instead provide a notification hook the indicates that a call needs attention and another that indicates that there's a new call to be collected. This makes the following possibilities more achievable: (1) Call refcounting can be made simpler if skbs don't hold refs to calls. (2) skbs referring to non-data events will be able to be freed much sooner rather than being queued for AFS to pick up as rxrpc_kernel_recv_data will be able to consult the call state. (3) We can shortcut the receive phase when a call is remotely aborted because we don't have to go through all the packets to get to the one cancelling the operation. (4) It makes it easier to do encryption/decryption directly between AFS's buffers and sk_buffs. (5) Encryption/decryption can more easily be done in the AFS's thread contexts - usually that of the userspace process that issued a syscall - rather than in one of rxrpc's background threads on a workqueue. (6) AFS will be able to wait synchronously on a call inside AF_RXRPC. To make this work, the following interface function has been added: int rxrpc_kernel_recv_data( struct socket *sock, struct rxrpc_call *call, void *buffer, size_t bufsize, size_t *_offset, bool want_more, u32 *_abort_code); This is the recvmsg equivalent. It allows the caller to find out about the state of a specific call and to transfer received data into a buffer piecemeal. afs_extract_data() and rxrpc_kernel_recv_data() now do all the extraction logic between them. They don't wait synchronously yet because the socket lock needs to be dealt with. Five interface functions have been removed: rxrpc_kernel_is_data_last() rxrpc_kernel_get_abort_code() rxrpc_kernel_get_error_number() rxrpc_kernel_free_skb() rxrpc_kernel_data_consumed() As a temporary hack, sk_buffs going to an in-kernel call are queued on the rxrpc_call struct (->knlrecv_queue) rather than being handed over to the in-kernel user. To process the queue internally, a temporary function, temp_deliver_data() has been added. This will be replaced with common code between the rxrpc_recvmsg() path and the kernel_rxrpc_recv_data() path in a future patch. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
216 lines
5.3 KiB
C
216 lines
5.3 KiB
C
/* AFS Volume Location Service client
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include "internal.h"
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/*
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* map volume locator abort codes to error codes
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*/
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static int afs_vl_abort_to_error(u32 abort_code)
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{
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_enter("%u", abort_code);
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switch (abort_code) {
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case AFSVL_IDEXIST: return -EEXIST;
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case AFSVL_IO: return -EREMOTEIO;
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case AFSVL_NAMEEXIST: return -EEXIST;
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case AFSVL_CREATEFAIL: return -EREMOTEIO;
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case AFSVL_NOENT: return -ENOMEDIUM;
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case AFSVL_EMPTY: return -ENOMEDIUM;
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case AFSVL_ENTDELETED: return -ENOMEDIUM;
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case AFSVL_BADNAME: return -EINVAL;
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case AFSVL_BADINDEX: return -EINVAL;
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case AFSVL_BADVOLTYPE: return -EINVAL;
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case AFSVL_BADSERVER: return -EINVAL;
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case AFSVL_BADPARTITION: return -EINVAL;
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case AFSVL_REPSFULL: return -EFBIG;
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case AFSVL_NOREPSERVER: return -ENOENT;
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case AFSVL_DUPREPSERVER: return -EEXIST;
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case AFSVL_RWNOTFOUND: return -ENOENT;
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case AFSVL_BADREFCOUNT: return -EINVAL;
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case AFSVL_SIZEEXCEEDED: return -EINVAL;
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case AFSVL_BADENTRY: return -EINVAL;
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case AFSVL_BADVOLIDBUMP: return -EINVAL;
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case AFSVL_IDALREADYHASHED: return -EINVAL;
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case AFSVL_ENTRYLOCKED: return -EBUSY;
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case AFSVL_BADVOLOPER: return -EBADRQC;
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case AFSVL_BADRELLOCKTYPE: return -EINVAL;
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case AFSVL_RERELEASE: return -EREMOTEIO;
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case AFSVL_BADSERVERFLAG: return -EINVAL;
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case AFSVL_PERM: return -EACCES;
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case AFSVL_NOMEM: return -EREMOTEIO;
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default:
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return afs_abort_to_error(abort_code);
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}
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}
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/*
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* deliver reply data to a VL.GetEntryByXXX call
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*/
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static int afs_deliver_vl_get_entry_by_xxx(struct afs_call *call)
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{
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struct afs_cache_vlocation *entry;
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__be32 *bp;
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u32 tmp;
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int loop, ret;
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_enter("");
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ret = afs_transfer_reply(call);
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if (ret < 0)
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return ret;
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/* unmarshall the reply once we've received all of it */
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entry = call->reply;
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bp = call->buffer;
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for (loop = 0; loop < 64; loop++)
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entry->name[loop] = ntohl(*bp++);
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entry->name[loop] = 0;
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bp++; /* final NUL */
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bp++; /* type */
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entry->nservers = ntohl(*bp++);
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for (loop = 0; loop < 8; loop++)
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entry->servers[loop].s_addr = *bp++;
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bp += 8; /* partition IDs */
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for (loop = 0; loop < 8; loop++) {
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tmp = ntohl(*bp++);
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entry->srvtmask[loop] = 0;
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if (tmp & AFS_VLSF_RWVOL)
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entry->srvtmask[loop] |= AFS_VOL_VTM_RW;
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if (tmp & AFS_VLSF_ROVOL)
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entry->srvtmask[loop] |= AFS_VOL_VTM_RO;
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if (tmp & AFS_VLSF_BACKVOL)
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entry->srvtmask[loop] |= AFS_VOL_VTM_BAK;
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}
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entry->vid[0] = ntohl(*bp++);
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entry->vid[1] = ntohl(*bp++);
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entry->vid[2] = ntohl(*bp++);
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bp++; /* clone ID */
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tmp = ntohl(*bp++); /* flags */
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entry->vidmask = 0;
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if (tmp & AFS_VLF_RWEXISTS)
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entry->vidmask |= AFS_VOL_VTM_RW;
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if (tmp & AFS_VLF_ROEXISTS)
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entry->vidmask |= AFS_VOL_VTM_RO;
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if (tmp & AFS_VLF_BACKEXISTS)
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entry->vidmask |= AFS_VOL_VTM_BAK;
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if (!entry->vidmask)
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return -EBADMSG;
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_leave(" = 0 [done]");
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return 0;
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}
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/*
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* VL.GetEntryByName operation type
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*/
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static const struct afs_call_type afs_RXVLGetEntryByName = {
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.name = "VL.GetEntryByName",
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.deliver = afs_deliver_vl_get_entry_by_xxx,
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.abort_to_error = afs_vl_abort_to_error,
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.destructor = afs_flat_call_destructor,
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};
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/*
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* VL.GetEntryById operation type
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*/
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static const struct afs_call_type afs_RXVLGetEntryById = {
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.name = "VL.GetEntryById",
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.deliver = afs_deliver_vl_get_entry_by_xxx,
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.abort_to_error = afs_vl_abort_to_error,
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.destructor = afs_flat_call_destructor,
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};
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/*
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* dispatch a get volume entry by name operation
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*/
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int afs_vl_get_entry_by_name(struct in_addr *addr,
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struct key *key,
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const char *volname,
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struct afs_cache_vlocation *entry,
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const struct afs_wait_mode *wait_mode)
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{
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struct afs_call *call;
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size_t volnamesz, reqsz, padsz;
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__be32 *bp;
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_enter("");
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volnamesz = strlen(volname);
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padsz = (4 - (volnamesz & 3)) & 3;
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reqsz = 8 + volnamesz + padsz;
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call = afs_alloc_flat_call(&afs_RXVLGetEntryByName, reqsz, 384);
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if (!call)
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return -ENOMEM;
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call->key = key;
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call->reply = entry;
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call->service_id = VL_SERVICE;
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call->port = htons(AFS_VL_PORT);
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/* marshall the parameters */
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bp = call->request;
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*bp++ = htonl(VLGETENTRYBYNAME);
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*bp++ = htonl(volnamesz);
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memcpy(bp, volname, volnamesz);
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if (padsz > 0)
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memset((void *) bp + volnamesz, 0, padsz);
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/* initiate the call */
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return afs_make_call(addr, call, GFP_KERNEL, wait_mode);
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}
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/*
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* dispatch a get volume entry by ID operation
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*/
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int afs_vl_get_entry_by_id(struct in_addr *addr,
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struct key *key,
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afs_volid_t volid,
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afs_voltype_t voltype,
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struct afs_cache_vlocation *entry,
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const struct afs_wait_mode *wait_mode)
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{
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struct afs_call *call;
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__be32 *bp;
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_enter("");
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call = afs_alloc_flat_call(&afs_RXVLGetEntryById, 12, 384);
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if (!call)
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return -ENOMEM;
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call->key = key;
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call->reply = entry;
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call->service_id = VL_SERVICE;
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call->port = htons(AFS_VL_PORT);
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/* marshall the parameters */
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bp = call->request;
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*bp++ = htonl(VLGETENTRYBYID);
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*bp++ = htonl(volid);
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*bp = htonl(voltype);
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/* initiate the call */
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return afs_make_call(addr, call, GFP_KERNEL, wait_mode);
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}
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