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759 lines
18 KiB
759 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* 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 ([email protected]) |
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*/ |
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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 "afs_fs.h" |
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#include "internal.h" |
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|
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/* |
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* Deliver reply data to a VL.GetEntryByNameU call. |
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*/ |
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static int afs_deliver_vl_get_entry_by_name_u(struct afs_call *call) |
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{ |
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struct afs_uvldbentry__xdr *uvldb; |
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struct afs_vldb_entry *entry; |
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bool new_only = false; |
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u32 tmp, nr_servers, vlflags; |
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int i, 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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|
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/* unmarshall the reply once we've received all of it */ |
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uvldb = call->buffer; |
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entry = call->ret_vldb; |
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nr_servers = ntohl(uvldb->nServers); |
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if (nr_servers > AFS_NMAXNSERVERS) |
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nr_servers = AFS_NMAXNSERVERS; |
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for (i = 0; i < ARRAY_SIZE(uvldb->name) - 1; i++) |
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entry->name[i] = (u8)ntohl(uvldb->name[i]); |
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entry->name[i] = 0; |
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entry->name_len = strlen(entry->name); |
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|
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/* If there is a new replication site that we can use, ignore all the |
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* sites that aren't marked as new. |
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*/ |
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for (i = 0; i < nr_servers; i++) { |
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tmp = ntohl(uvldb->serverFlags[i]); |
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if (!(tmp & AFS_VLSF_DONTUSE) && |
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(tmp & AFS_VLSF_NEWREPSITE)) |
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new_only = true; |
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} |
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|
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vlflags = ntohl(uvldb->flags); |
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for (i = 0; i < nr_servers; i++) { |
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struct afs_uuid__xdr *xdr; |
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struct afs_uuid *uuid; |
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int j; |
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int n = entry->nr_servers; |
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tmp = ntohl(uvldb->serverFlags[i]); |
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if (tmp & AFS_VLSF_DONTUSE || |
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(new_only && !(tmp & AFS_VLSF_NEWREPSITE))) |
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continue; |
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if (tmp & AFS_VLSF_RWVOL) { |
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entry->fs_mask[n] |= AFS_VOL_VTM_RW; |
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if (vlflags & AFS_VLF_BACKEXISTS) |
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entry->fs_mask[n] |= AFS_VOL_VTM_BAK; |
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} |
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if (tmp & AFS_VLSF_ROVOL) |
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entry->fs_mask[n] |= AFS_VOL_VTM_RO; |
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if (!entry->fs_mask[n]) |
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continue; |
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|
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xdr = &uvldb->serverNumber[i]; |
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uuid = (struct afs_uuid *)&entry->fs_server[n]; |
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uuid->time_low = xdr->time_low; |
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uuid->time_mid = htons(ntohl(xdr->time_mid)); |
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uuid->time_hi_and_version = htons(ntohl(xdr->time_hi_and_version)); |
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uuid->clock_seq_hi_and_reserved = (u8)ntohl(xdr->clock_seq_hi_and_reserved); |
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uuid->clock_seq_low = (u8)ntohl(xdr->clock_seq_low); |
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for (j = 0; j < 6; j++) |
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uuid->node[j] = (u8)ntohl(xdr->node[j]); |
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|
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entry->addr_version[n] = ntohl(uvldb->serverUnique[i]); |
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entry->nr_servers++; |
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} |
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for (i = 0; i < AFS_MAXTYPES; i++) |
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entry->vid[i] = ntohl(uvldb->volumeId[i]); |
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if (vlflags & AFS_VLF_RWEXISTS) |
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__set_bit(AFS_VLDB_HAS_RW, &entry->flags); |
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if (vlflags & AFS_VLF_ROEXISTS) |
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__set_bit(AFS_VLDB_HAS_RO, &entry->flags); |
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if (vlflags & AFS_VLF_BACKEXISTS) |
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__set_bit(AFS_VLDB_HAS_BAK, &entry->flags); |
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if (!(vlflags & (AFS_VLF_RWEXISTS | AFS_VLF_ROEXISTS | AFS_VLF_BACKEXISTS))) { |
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entry->error = -ENOMEDIUM; |
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__set_bit(AFS_VLDB_QUERY_ERROR, &entry->flags); |
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} |
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__set_bit(AFS_VLDB_QUERY_VALID, &entry->flags); |
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_leave(" = 0 [done]"); |
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return 0; |
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} |
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static void afs_destroy_vl_get_entry_by_name_u(struct afs_call *call) |
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{ |
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kfree(call->ret_vldb); |
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afs_flat_call_destructor(call); |
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} |
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/* |
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* VL.GetEntryByNameU operation type. |
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*/ |
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static const struct afs_call_type afs_RXVLGetEntryByNameU = { |
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.name = "VL.GetEntryByNameU", |
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.op = afs_VL_GetEntryByNameU, |
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.deliver = afs_deliver_vl_get_entry_by_name_u, |
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.destructor = afs_destroy_vl_get_entry_by_name_u, |
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}; |
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/* |
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* Dispatch a get volume entry by name or ID operation (uuid variant). If the |
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* volname is a decimal number then it's a volume ID not a volume name. |
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*/ |
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struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *vc, |
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const char *volname, |
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int volnamesz) |
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{ |
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struct afs_vldb_entry *entry; |
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struct afs_call *call; |
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struct afs_net *net = vc->cell->net; |
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size_t reqsz, padsz; |
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__be32 *bp; |
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_enter(""); |
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padsz = (4 - (volnamesz & 3)) & 3; |
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reqsz = 8 + volnamesz + padsz; |
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entry = kzalloc(sizeof(struct afs_vldb_entry), GFP_KERNEL); |
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if (!entry) |
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return ERR_PTR(-ENOMEM); |
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call = afs_alloc_flat_call(net, &afs_RXVLGetEntryByNameU, reqsz, |
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sizeof(struct afs_uvldbentry__xdr)); |
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if (!call) { |
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kfree(entry); |
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return ERR_PTR(-ENOMEM); |
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} |
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call->key = vc->key; |
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call->ret_vldb = entry; |
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call->max_lifespan = AFS_VL_MAX_LIFESPAN; |
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/* Marshall the parameters */ |
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bp = call->request; |
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*bp++ = htonl(VLGETENTRYBYNAMEU); |
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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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trace_afs_make_vl_call(call); |
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afs_make_call(&vc->ac, call, GFP_KERNEL); |
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return (struct afs_vldb_entry *)afs_wait_for_call_to_complete(call, &vc->ac); |
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} |
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/* |
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* Deliver reply data to a VL.GetAddrsU call. |
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* |
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* GetAddrsU(IN ListAddrByAttributes *inaddr, |
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* OUT afsUUID *uuidp1, |
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* OUT uint32_t *uniquifier, |
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* OUT uint32_t *nentries, |
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* OUT bulkaddrs *blkaddrs); |
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*/ |
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static int afs_deliver_vl_get_addrs_u(struct afs_call *call) |
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{ |
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struct afs_addr_list *alist; |
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__be32 *bp; |
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u32 uniquifier, nentries, count; |
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int i, ret; |
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_enter("{%u,%zu/%u}", |
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call->unmarshall, iov_iter_count(call->iter), call->count); |
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|
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switch (call->unmarshall) { |
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case 0: |
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afs_extract_to_buf(call, |
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sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32)); |
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call->unmarshall++; |
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|
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/* Extract the returned uuid, uniquifier, nentries and |
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* blkaddrs size */ |
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fallthrough; |
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case 1: |
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ret = afs_extract_data(call, true); |
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if (ret < 0) |
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return ret; |
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bp = call->buffer + sizeof(struct afs_uuid__xdr); |
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uniquifier = ntohl(*bp++); |
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nentries = ntohl(*bp++); |
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count = ntohl(*bp); |
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nentries = min(nentries, count); |
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alist = afs_alloc_addrlist(nentries, FS_SERVICE, AFS_FS_PORT); |
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if (!alist) |
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return -ENOMEM; |
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alist->version = uniquifier; |
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call->ret_alist = alist; |
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call->count = count; |
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call->count2 = nentries; |
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call->unmarshall++; |
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more_entries: |
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count = min(call->count, 4U); |
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afs_extract_to_buf(call, count * sizeof(__be32)); |
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|
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fallthrough; /* and extract entries */ |
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case 2: |
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ret = afs_extract_data(call, call->count > 4); |
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if (ret < 0) |
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return ret; |
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alist = call->ret_alist; |
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bp = call->buffer; |
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count = min(call->count, 4U); |
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for (i = 0; i < count; i++) |
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if (alist->nr_addrs < call->count2) |
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afs_merge_fs_addr4(alist, *bp++, AFS_FS_PORT); |
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call->count -= count; |
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if (call->count > 0) |
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goto more_entries; |
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call->unmarshall++; |
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break; |
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} |
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_leave(" = 0 [done]"); |
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return 0; |
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} |
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static void afs_vl_get_addrs_u_destructor(struct afs_call *call) |
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{ |
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afs_put_addrlist(call->ret_alist); |
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return afs_flat_call_destructor(call); |
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} |
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/* |
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* VL.GetAddrsU operation type. |
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*/ |
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static const struct afs_call_type afs_RXVLGetAddrsU = { |
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.name = "VL.GetAddrsU", |
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.op = afs_VL_GetAddrsU, |
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.deliver = afs_deliver_vl_get_addrs_u, |
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.destructor = afs_vl_get_addrs_u_destructor, |
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}; |
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/* |
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* Dispatch an operation to get the addresses for a server, where the server is |
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* nominated by UUID. |
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*/ |
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struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *vc, |
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const uuid_t *uuid) |
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{ |
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struct afs_ListAddrByAttributes__xdr *r; |
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const struct afs_uuid *u = (const struct afs_uuid *)uuid; |
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struct afs_call *call; |
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struct afs_net *net = vc->cell->net; |
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__be32 *bp; |
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int i; |
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_enter(""); |
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call = afs_alloc_flat_call(net, &afs_RXVLGetAddrsU, |
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sizeof(__be32) + sizeof(struct afs_ListAddrByAttributes__xdr), |
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sizeof(struct afs_uuid__xdr) + 3 * sizeof(__be32)); |
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if (!call) |
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return ERR_PTR(-ENOMEM); |
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call->key = vc->key; |
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call->ret_alist = NULL; |
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call->max_lifespan = AFS_VL_MAX_LIFESPAN; |
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/* Marshall the parameters */ |
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bp = call->request; |
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*bp++ = htonl(VLGETADDRSU); |
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r = (struct afs_ListAddrByAttributes__xdr *)bp; |
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r->Mask = htonl(AFS_VLADDR_UUID); |
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r->ipaddr = 0; |
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r->index = 0; |
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r->spare = 0; |
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r->uuid.time_low = u->time_low; |
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r->uuid.time_mid = htonl(ntohs(u->time_mid)); |
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r->uuid.time_hi_and_version = htonl(ntohs(u->time_hi_and_version)); |
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r->uuid.clock_seq_hi_and_reserved = htonl(u->clock_seq_hi_and_reserved); |
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r->uuid.clock_seq_low = htonl(u->clock_seq_low); |
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for (i = 0; i < 6; i++) |
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r->uuid.node[i] = htonl(u->node[i]); |
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trace_afs_make_vl_call(call); |
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afs_make_call(&vc->ac, call, GFP_KERNEL); |
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return (struct afs_addr_list *)afs_wait_for_call_to_complete(call, &vc->ac); |
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} |
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/* |
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* Deliver reply data to an VL.GetCapabilities operation. |
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*/ |
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static int afs_deliver_vl_get_capabilities(struct afs_call *call) |
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{ |
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u32 count; |
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int ret; |
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_enter("{%u,%zu/%u}", |
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call->unmarshall, iov_iter_count(call->iter), call->count); |
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switch (call->unmarshall) { |
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case 0: |
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afs_extract_to_tmp(call); |
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call->unmarshall++; |
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|
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fallthrough; /* and extract the capabilities word count */ |
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case 1: |
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ret = afs_extract_data(call, true); |
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if (ret < 0) |
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return ret; |
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count = ntohl(call->tmp); |
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call->count = count; |
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call->count2 = count; |
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call->unmarshall++; |
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afs_extract_discard(call, count * sizeof(__be32)); |
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|
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fallthrough; /* and extract capabilities words */ |
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case 2: |
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ret = afs_extract_data(call, false); |
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if (ret < 0) |
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return ret; |
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/* TODO: Examine capabilities */ |
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call->unmarshall++; |
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break; |
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} |
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_leave(" = 0 [done]"); |
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return 0; |
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} |
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static void afs_destroy_vl_get_capabilities(struct afs_call *call) |
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{ |
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afs_put_vlserver(call->net, call->vlserver); |
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afs_flat_call_destructor(call); |
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} |
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|
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/* |
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* VL.GetCapabilities operation type |
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*/ |
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static const struct afs_call_type afs_RXVLGetCapabilities = { |
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.name = "VL.GetCapabilities", |
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.op = afs_VL_GetCapabilities, |
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.deliver = afs_deliver_vl_get_capabilities, |
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.done = afs_vlserver_probe_result, |
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.destructor = afs_destroy_vl_get_capabilities, |
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}; |
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|
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/* |
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* Probe a volume server for the capabilities that it supports. This can |
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* return up to 196 words. |
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* |
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* We use this to probe for service upgrade to determine what the server at the |
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* other end supports. |
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*/ |
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struct afs_call *afs_vl_get_capabilities(struct afs_net *net, |
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struct afs_addr_cursor *ac, |
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struct key *key, |
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struct afs_vlserver *server, |
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unsigned int server_index) |
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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(net, &afs_RXVLGetCapabilities, 1 * 4, 16 * 4); |
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if (!call) |
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return ERR_PTR(-ENOMEM); |
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call->key = key; |
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call->vlserver = afs_get_vlserver(server); |
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call->server_index = server_index; |
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call->upgrade = true; |
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call->async = true; |
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call->max_lifespan = AFS_PROBE_MAX_LIFESPAN; |
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|
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/* marshall the parameters */ |
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bp = call->request; |
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*bp++ = htonl(VLGETCAPABILITIES); |
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|
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/* Can't take a ref on server */ |
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trace_afs_make_vl_call(call); |
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afs_make_call(ac, call, GFP_KERNEL); |
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return call; |
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} |
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|
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/* |
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* Deliver reply data to a YFSVL.GetEndpoints call. |
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* |
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* GetEndpoints(IN yfsServerAttributes *attr, |
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* OUT opr_uuid *uuid, |
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* OUT afs_int32 *uniquifier, |
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* OUT endpoints *fsEndpoints, |
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* OUT endpoints *volEndpoints) |
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*/ |
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static int afs_deliver_yfsvl_get_endpoints(struct afs_call *call) |
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{ |
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struct afs_addr_list *alist; |
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__be32 *bp; |
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u32 uniquifier, size; |
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int ret; |
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|
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_enter("{%u,%zu,%u}", |
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call->unmarshall, iov_iter_count(call->iter), call->count2); |
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|
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switch (call->unmarshall) { |
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case 0: |
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afs_extract_to_buf(call, sizeof(uuid_t) + 3 * sizeof(__be32)); |
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call->unmarshall = 1; |
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|
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/* Extract the returned uuid, uniquifier, fsEndpoints count and |
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* either the first fsEndpoint type or the volEndpoints |
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* count if there are no fsEndpoints. */ |
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fallthrough; |
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case 1: |
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ret = afs_extract_data(call, true); |
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if (ret < 0) |
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return ret; |
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|
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bp = call->buffer + sizeof(uuid_t); |
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uniquifier = ntohl(*bp++); |
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call->count = ntohl(*bp++); |
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call->count2 = ntohl(*bp); /* Type or next count */ |
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|
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if (call->count > YFS_MAXENDPOINTS) |
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return afs_protocol_error(call, afs_eproto_yvl_fsendpt_num); |
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|
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alist = afs_alloc_addrlist(call->count, FS_SERVICE, AFS_FS_PORT); |
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if (!alist) |
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return -ENOMEM; |
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alist->version = uniquifier; |
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call->ret_alist = alist; |
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|
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if (call->count == 0) |
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goto extract_volendpoints; |
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|
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next_fsendpoint: |
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switch (call->count2) { |
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case YFS_ENDPOINT_IPV4: |
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size = sizeof(__be32) * (1 + 1 + 1); |
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break; |
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case YFS_ENDPOINT_IPV6: |
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size = sizeof(__be32) * (1 + 4 + 1); |
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break; |
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default: |
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return afs_protocol_error(call, afs_eproto_yvl_fsendpt_type); |
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} |
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|
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size += sizeof(__be32); |
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afs_extract_to_buf(call, size); |
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call->unmarshall = 2; |
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|
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fallthrough; /* and extract fsEndpoints[] entries */ |
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case 2: |
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ret = afs_extract_data(call, true); |
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if (ret < 0) |
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return ret; |
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|
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alist = call->ret_alist; |
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bp = call->buffer; |
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switch (call->count2) { |
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case YFS_ENDPOINT_IPV4: |
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if (ntohl(bp[0]) != sizeof(__be32) * 2) |
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return afs_protocol_error( |
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call, afs_eproto_yvl_fsendpt4_len); |
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afs_merge_fs_addr4(alist, bp[1], ntohl(bp[2])); |
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bp += 3; |
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break; |
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case YFS_ENDPOINT_IPV6: |
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if (ntohl(bp[0]) != sizeof(__be32) * 5) |
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return afs_protocol_error( |
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call, afs_eproto_yvl_fsendpt6_len); |
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afs_merge_fs_addr6(alist, bp + 1, ntohl(bp[5])); |
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bp += 6; |
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break; |
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default: |
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return afs_protocol_error(call, afs_eproto_yvl_fsendpt_type); |
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} |
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|
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/* Got either the type of the next entry or the count of |
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* volEndpoints if no more fsEndpoints. |
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*/ |
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call->count2 = ntohl(*bp++); |
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|
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call->count--; |
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if (call->count > 0) |
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goto next_fsendpoint; |
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|
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extract_volendpoints: |
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/* Extract the list of volEndpoints. */ |
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call->count = call->count2; |
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if (!call->count) |
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goto end; |
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if (call->count > YFS_MAXENDPOINTS) |
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return afs_protocol_error(call, afs_eproto_yvl_vlendpt_type); |
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|
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afs_extract_to_buf(call, 1 * sizeof(__be32)); |
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call->unmarshall = 3; |
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|
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/* Extract the type of volEndpoints[0]. Normally we would |
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* extract the type of the next endpoint when we extract the |
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* data of the current one, but this is the first... |
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*/ |
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fallthrough; |
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case 3: |
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ret = afs_extract_data(call, true); |
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if (ret < 0) |
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return ret; |
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|
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bp = call->buffer; |
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|
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next_volendpoint: |
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call->count2 = ntohl(*bp++); |
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switch (call->count2) { |
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case YFS_ENDPOINT_IPV4: |
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size = sizeof(__be32) * (1 + 1 + 1); |
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break; |
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case YFS_ENDPOINT_IPV6: |
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size = sizeof(__be32) * (1 + 4 + 1); |
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break; |
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default: |
|
return afs_protocol_error(call, afs_eproto_yvl_vlendpt_type); |
|
} |
|
|
|
if (call->count > 1) |
|
size += sizeof(__be32); /* Get next type too */ |
|
afs_extract_to_buf(call, size); |
|
call->unmarshall = 4; |
|
|
|
fallthrough; /* and extract volEndpoints[] entries */ |
|
case 4: |
|
ret = afs_extract_data(call, true); |
|
if (ret < 0) |
|
return ret; |
|
|
|
bp = call->buffer; |
|
switch (call->count2) { |
|
case YFS_ENDPOINT_IPV4: |
|
if (ntohl(bp[0]) != sizeof(__be32) * 2) |
|
return afs_protocol_error( |
|
call, afs_eproto_yvl_vlendpt4_len); |
|
bp += 3; |
|
break; |
|
case YFS_ENDPOINT_IPV6: |
|
if (ntohl(bp[0]) != sizeof(__be32) * 5) |
|
return afs_protocol_error( |
|
call, afs_eproto_yvl_vlendpt6_len); |
|
bp += 6; |
|
break; |
|
default: |
|
return afs_protocol_error(call, afs_eproto_yvl_vlendpt_type); |
|
} |
|
|
|
/* Got either the type of the next entry or the count of |
|
* volEndpoints if no more fsEndpoints. |
|
*/ |
|
call->count--; |
|
if (call->count > 0) |
|
goto next_volendpoint; |
|
|
|
end: |
|
afs_extract_discard(call, 0); |
|
call->unmarshall = 5; |
|
|
|
fallthrough; /* Done */ |
|
case 5: |
|
ret = afs_extract_data(call, false); |
|
if (ret < 0) |
|
return ret; |
|
call->unmarshall = 6; |
|
fallthrough; |
|
|
|
case 6: |
|
break; |
|
} |
|
|
|
_leave(" = 0 [done]"); |
|
return 0; |
|
} |
|
|
|
/* |
|
* YFSVL.GetEndpoints operation type. |
|
*/ |
|
static const struct afs_call_type afs_YFSVLGetEndpoints = { |
|
.name = "YFSVL.GetEndpoints", |
|
.op = afs_YFSVL_GetEndpoints, |
|
.deliver = afs_deliver_yfsvl_get_endpoints, |
|
.destructor = afs_vl_get_addrs_u_destructor, |
|
}; |
|
|
|
/* |
|
* Dispatch an operation to get the addresses for a server, where the server is |
|
* nominated by UUID. |
|
*/ |
|
struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *vc, |
|
const uuid_t *uuid) |
|
{ |
|
struct afs_call *call; |
|
struct afs_net *net = vc->cell->net; |
|
__be32 *bp; |
|
|
|
_enter(""); |
|
|
|
call = afs_alloc_flat_call(net, &afs_YFSVLGetEndpoints, |
|
sizeof(__be32) * 2 + sizeof(*uuid), |
|
sizeof(struct in6_addr) + sizeof(__be32) * 3); |
|
if (!call) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
call->key = vc->key; |
|
call->ret_alist = NULL; |
|
call->max_lifespan = AFS_VL_MAX_LIFESPAN; |
|
|
|
/* Marshall the parameters */ |
|
bp = call->request; |
|
*bp++ = htonl(YVLGETENDPOINTS); |
|
*bp++ = htonl(YFS_SERVER_UUID); |
|
memcpy(bp, uuid, sizeof(*uuid)); /* Type opr_uuid */ |
|
|
|
trace_afs_make_vl_call(call); |
|
afs_make_call(&vc->ac, call, GFP_KERNEL); |
|
return (struct afs_addr_list *)afs_wait_for_call_to_complete(call, &vc->ac); |
|
} |
|
|
|
/* |
|
* Deliver reply data to a YFSVL.GetCellName operation. |
|
*/ |
|
static int afs_deliver_yfsvl_get_cell_name(struct afs_call *call) |
|
{ |
|
char *cell_name; |
|
u32 namesz, paddedsz; |
|
int ret; |
|
|
|
_enter("{%u,%zu/%u}", |
|
call->unmarshall, iov_iter_count(call->iter), call->count); |
|
|
|
switch (call->unmarshall) { |
|
case 0: |
|
afs_extract_to_tmp(call); |
|
call->unmarshall++; |
|
|
|
fallthrough; /* and extract the cell name length */ |
|
case 1: |
|
ret = afs_extract_data(call, true); |
|
if (ret < 0) |
|
return ret; |
|
|
|
namesz = ntohl(call->tmp); |
|
if (namesz > AFS_MAXCELLNAME) |
|
return afs_protocol_error(call, afs_eproto_cellname_len); |
|
paddedsz = (namesz + 3) & ~3; |
|
call->count = namesz; |
|
call->count2 = paddedsz - namesz; |
|
|
|
cell_name = kmalloc(namesz + 1, GFP_KERNEL); |
|
if (!cell_name) |
|
return -ENOMEM; |
|
cell_name[namesz] = 0; |
|
call->ret_str = cell_name; |
|
|
|
afs_extract_begin(call, cell_name, namesz); |
|
call->unmarshall++; |
|
|
|
fallthrough; /* and extract cell name */ |
|
case 2: |
|
ret = afs_extract_data(call, true); |
|
if (ret < 0) |
|
return ret; |
|
|
|
afs_extract_discard(call, call->count2); |
|
call->unmarshall++; |
|
|
|
fallthrough; /* and extract padding */ |
|
case 3: |
|
ret = afs_extract_data(call, false); |
|
if (ret < 0) |
|
return ret; |
|
|
|
call->unmarshall++; |
|
break; |
|
} |
|
|
|
_leave(" = 0 [done]"); |
|
return 0; |
|
} |
|
|
|
static void afs_destroy_yfsvl_get_cell_name(struct afs_call *call) |
|
{ |
|
kfree(call->ret_str); |
|
afs_flat_call_destructor(call); |
|
} |
|
|
|
/* |
|
* VL.GetCapabilities operation type |
|
*/ |
|
static const struct afs_call_type afs_YFSVLGetCellName = { |
|
.name = "YFSVL.GetCellName", |
|
.op = afs_YFSVL_GetCellName, |
|
.deliver = afs_deliver_yfsvl_get_cell_name, |
|
.destructor = afs_destroy_yfsvl_get_cell_name, |
|
}; |
|
|
|
/* |
|
* Probe a volume server for the capabilities that it supports. This can |
|
* return up to 196 words. |
|
* |
|
* We use this to probe for service upgrade to determine what the server at the |
|
* other end supports. |
|
*/ |
|
char *afs_yfsvl_get_cell_name(struct afs_vl_cursor *vc) |
|
{ |
|
struct afs_call *call; |
|
struct afs_net *net = vc->cell->net; |
|
__be32 *bp; |
|
|
|
_enter(""); |
|
|
|
call = afs_alloc_flat_call(net, &afs_YFSVLGetCellName, 1 * 4, 0); |
|
if (!call) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
call->key = vc->key; |
|
call->ret_str = NULL; |
|
call->max_lifespan = AFS_VL_MAX_LIFESPAN; |
|
|
|
/* marshall the parameters */ |
|
bp = call->request; |
|
*bp++ = htonl(YVLGETCELLNAME); |
|
|
|
/* Can't take a ref on server */ |
|
trace_afs_make_vl_call(call); |
|
afs_make_call(&vc->ac, call, GFP_KERNEL); |
|
return (char *)afs_wait_for_call_to_complete(call, &vc->ac); |
|
}
|
|
|