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![Linus Torvalds](/assets/img/avatar_default.png)
Pull AFS updates from Al Viro: "Assorted AFS stuff - ended up in vfs.git since most of that consists of David's AFS-related followups to Christoph's procfs series" * 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: afs: Optimise callback breaking by not repeating volume lookup afs: Display manually added cells in dynamic root mount afs: Enable IPv6 DNS lookups afs: Show all of a server's addresses in /proc/fs/afs/servers afs: Handle CONFIG_PROC_FS=n proc: Make inline name size calculation automatic afs: Implement network namespacing afs: Mark afs_net::ws_cell as __rcu and set using rcu functions afs: Fix a Sparse warning in xdr_decode_AFSFetchStatus() proc: Add a way to make network proc files writable afs: Rearrange fs/afs/proc.c to remove remaining predeclarations. afs: Rearrange fs/afs/proc.c to move the show routines up afs: Rearrange fs/afs/proc.c by moving fops and open functions down afs: Move /proc management functions to the end of the file
581 lines
14 KiB
C
581 lines
14 KiB
C
/* AFS Cache Manager Service
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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/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/ip.h>
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#include "internal.h"
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#include "afs_cm.h"
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static int afs_deliver_cb_init_call_back_state(struct afs_call *);
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static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
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static int afs_deliver_cb_probe(struct afs_call *);
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static int afs_deliver_cb_callback(struct afs_call *);
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static int afs_deliver_cb_probe_uuid(struct afs_call *);
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static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
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static void afs_cm_destructor(struct afs_call *);
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static void SRXAFSCB_CallBack(struct work_struct *);
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static void SRXAFSCB_InitCallBackState(struct work_struct *);
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static void SRXAFSCB_Probe(struct work_struct *);
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static void SRXAFSCB_ProbeUuid(struct work_struct *);
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static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
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#define CM_NAME(name) \
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const char afs_SRXCB##name##_name[] __tracepoint_string = \
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"CB." #name
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/*
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* CB.CallBack operation type
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*/
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static CM_NAME(CallBack);
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static const struct afs_call_type afs_SRXCBCallBack = {
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.name = afs_SRXCBCallBack_name,
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.deliver = afs_deliver_cb_callback,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_CallBack,
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};
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/*
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* CB.InitCallBackState operation type
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*/
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static CM_NAME(InitCallBackState);
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static const struct afs_call_type afs_SRXCBInitCallBackState = {
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.name = afs_SRXCBInitCallBackState_name,
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.deliver = afs_deliver_cb_init_call_back_state,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_InitCallBackState,
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};
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/*
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* CB.InitCallBackState3 operation type
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*/
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static CM_NAME(InitCallBackState3);
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static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
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.name = afs_SRXCBInitCallBackState3_name,
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.deliver = afs_deliver_cb_init_call_back_state3,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_InitCallBackState,
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};
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/*
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* CB.Probe operation type
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*/
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static CM_NAME(Probe);
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static const struct afs_call_type afs_SRXCBProbe = {
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.name = afs_SRXCBProbe_name,
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.deliver = afs_deliver_cb_probe,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_Probe,
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};
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/*
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* CB.ProbeUuid operation type
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*/
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static CM_NAME(ProbeUuid);
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static const struct afs_call_type afs_SRXCBProbeUuid = {
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.name = afs_SRXCBProbeUuid_name,
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.deliver = afs_deliver_cb_probe_uuid,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_ProbeUuid,
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};
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/*
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* CB.TellMeAboutYourself operation type
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*/
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static CM_NAME(TellMeAboutYourself);
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static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
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.name = afs_SRXCBTellMeAboutYourself_name,
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.deliver = afs_deliver_cb_tell_me_about_yourself,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_TellMeAboutYourself,
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};
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/*
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* route an incoming cache manager call
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* - return T if supported, F if not
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*/
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bool afs_cm_incoming_call(struct afs_call *call)
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{
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_enter("{CB.OP %u}", call->operation_ID);
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switch (call->operation_ID) {
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case CBCallBack:
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call->type = &afs_SRXCBCallBack;
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return true;
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case CBInitCallBackState:
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call->type = &afs_SRXCBInitCallBackState;
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return true;
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case CBInitCallBackState3:
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call->type = &afs_SRXCBInitCallBackState3;
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return true;
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case CBProbe:
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call->type = &afs_SRXCBProbe;
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return true;
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case CBProbeUuid:
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call->type = &afs_SRXCBProbeUuid;
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return true;
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case CBTellMeAboutYourself:
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call->type = &afs_SRXCBTellMeAboutYourself;
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return true;
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default:
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return false;
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}
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}
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/*
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* Clean up a cache manager call.
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*/
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static void afs_cm_destructor(struct afs_call *call)
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{
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kfree(call->buffer);
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call->buffer = NULL;
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}
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/*
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* The server supplied a list of callbacks that it wanted to break.
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*/
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static void SRXAFSCB_CallBack(struct work_struct *work)
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{
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struct afs_call *call = container_of(work, struct afs_call, work);
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_enter("");
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/* We need to break the callbacks before sending the reply as the
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* server holds up change visibility till it receives our reply so as
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* to maintain cache coherency.
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*/
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if (call->cm_server)
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afs_break_callbacks(call->cm_server, call->count, call->request);
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afs_send_empty_reply(call);
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afs_put_call(call);
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_leave("");
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}
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/*
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* deliver request data to a CB.CallBack call
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*/
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static int afs_deliver_cb_callback(struct afs_call *call)
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{
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struct afs_callback_break *cb;
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struct sockaddr_rxrpc srx;
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__be32 *bp;
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int ret, loop;
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_enter("{%u}", call->unmarshall);
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switch (call->unmarshall) {
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case 0:
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call->offset = 0;
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call->unmarshall++;
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/* extract the FID array and its count in two steps */
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case 1:
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_debug("extract FID count");
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ret = afs_extract_data(call, &call->tmp, 4, true);
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if (ret < 0)
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return ret;
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call->count = ntohl(call->tmp);
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_debug("FID count: %u", call->count);
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if (call->count > AFSCBMAX)
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return afs_protocol_error(call, -EBADMSG);
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call->buffer = kmalloc(array3_size(call->count, 3, 4),
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GFP_KERNEL);
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if (!call->buffer)
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return -ENOMEM;
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call->offset = 0;
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call->unmarshall++;
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case 2:
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_debug("extract FID array");
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ret = afs_extract_data(call, call->buffer,
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call->count * 3 * 4, true);
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if (ret < 0)
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return ret;
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_debug("unmarshall FID array");
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call->request = kcalloc(call->count,
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sizeof(struct afs_callback_break),
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GFP_KERNEL);
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if (!call->request)
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return -ENOMEM;
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cb = call->request;
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bp = call->buffer;
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for (loop = call->count; loop > 0; loop--, cb++) {
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cb->fid.vid = ntohl(*bp++);
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cb->fid.vnode = ntohl(*bp++);
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cb->fid.unique = ntohl(*bp++);
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cb->cb.type = AFSCM_CB_UNTYPED;
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}
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call->offset = 0;
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call->unmarshall++;
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/* extract the callback array and its count in two steps */
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case 3:
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_debug("extract CB count");
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ret = afs_extract_data(call, &call->tmp, 4, true);
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if (ret < 0)
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return ret;
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call->count2 = ntohl(call->tmp);
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_debug("CB count: %u", call->count2);
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if (call->count2 != call->count && call->count2 != 0)
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return afs_protocol_error(call, -EBADMSG);
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call->offset = 0;
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call->unmarshall++;
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case 4:
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_debug("extract CB array");
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ret = afs_extract_data(call, call->buffer,
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call->count2 * 3 * 4, false);
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if (ret < 0)
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return ret;
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_debug("unmarshall CB array");
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cb = call->request;
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bp = call->buffer;
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for (loop = call->count2; loop > 0; loop--, cb++) {
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cb->cb.version = ntohl(*bp++);
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cb->cb.expiry = ntohl(*bp++);
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cb->cb.type = ntohl(*bp++);
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}
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call->offset = 0;
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call->unmarshall++;
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case 5:
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break;
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}
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if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
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return -EIO;
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/* we'll need the file server record as that tells us which set of
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* vnodes to operate upon */
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rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
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call->cm_server = afs_find_server(call->net, &srx);
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if (!call->cm_server)
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trace_afs_cm_no_server(call, &srx);
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return afs_queue_call_work(call);
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}
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/*
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* allow the fileserver to request callback state (re-)initialisation
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*/
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static void SRXAFSCB_InitCallBackState(struct work_struct *work)
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{
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struct afs_call *call = container_of(work, struct afs_call, work);
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_enter("{%p}", call->cm_server);
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if (call->cm_server)
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afs_init_callback_state(call->cm_server);
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afs_send_empty_reply(call);
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afs_put_call(call);
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_leave("");
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}
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/*
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* deliver request data to a CB.InitCallBackState call
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*/
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static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
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{
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struct sockaddr_rxrpc srx;
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int ret;
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_enter("");
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rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
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ret = afs_extract_data(call, NULL, 0, false);
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if (ret < 0)
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return ret;
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/* we'll need the file server record as that tells us which set of
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* vnodes to operate upon */
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call->cm_server = afs_find_server(call->net, &srx);
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if (!call->cm_server)
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trace_afs_cm_no_server(call, &srx);
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return afs_queue_call_work(call);
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}
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/*
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* deliver request data to a CB.InitCallBackState3 call
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*/
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static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
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{
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struct afs_uuid *r;
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unsigned loop;
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__be32 *b;
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int ret;
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_enter("");
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_enter("{%u}", call->unmarshall);
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switch (call->unmarshall) {
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case 0:
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call->offset = 0;
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call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
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if (!call->buffer)
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return -ENOMEM;
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call->unmarshall++;
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case 1:
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_debug("extract UUID");
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ret = afs_extract_data(call, call->buffer,
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11 * sizeof(__be32), false);
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switch (ret) {
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case 0: break;
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case -EAGAIN: return 0;
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default: return ret;
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}
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_debug("unmarshall UUID");
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call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
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if (!call->request)
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return -ENOMEM;
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b = call->buffer;
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r = call->request;
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r->time_low = b[0];
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r->time_mid = htons(ntohl(b[1]));
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r->time_hi_and_version = htons(ntohl(b[2]));
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r->clock_seq_hi_and_reserved = ntohl(b[3]);
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r->clock_seq_low = ntohl(b[4]);
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for (loop = 0; loop < 6; loop++)
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r->node[loop] = ntohl(b[loop + 5]);
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call->offset = 0;
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call->unmarshall++;
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case 2:
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break;
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}
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if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
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return -EIO;
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/* we'll need the file server record as that tells us which set of
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* vnodes to operate upon */
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rcu_read_lock();
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call->cm_server = afs_find_server_by_uuid(call->net, call->request);
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rcu_read_unlock();
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if (!call->cm_server)
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trace_afs_cm_no_server_u(call, call->request);
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return afs_queue_call_work(call);
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}
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/*
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* allow the fileserver to see if the cache manager is still alive
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*/
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static void SRXAFSCB_Probe(struct work_struct *work)
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{
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struct afs_call *call = container_of(work, struct afs_call, work);
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_enter("");
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afs_send_empty_reply(call);
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afs_put_call(call);
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_leave("");
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}
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/*
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* deliver request data to a CB.Probe call
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*/
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static int afs_deliver_cb_probe(struct afs_call *call)
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{
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int ret;
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_enter("");
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ret = afs_extract_data(call, NULL, 0, false);
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if (ret < 0)
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return ret;
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if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
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return -EIO;
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return afs_queue_call_work(call);
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}
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/*
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* allow the fileserver to quickly find out if the fileserver has been rebooted
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*/
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static void SRXAFSCB_ProbeUuid(struct work_struct *work)
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{
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struct afs_call *call = container_of(work, struct afs_call, work);
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struct afs_uuid *r = call->request;
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struct {
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__be32 match;
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} reply;
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_enter("");
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if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
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reply.match = htonl(0);
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else
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reply.match = htonl(1);
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afs_send_simple_reply(call, &reply, sizeof(reply));
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afs_put_call(call);
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_leave("");
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}
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/*
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* deliver request data to a CB.ProbeUuid call
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*/
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static int afs_deliver_cb_probe_uuid(struct afs_call *call)
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{
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struct afs_uuid *r;
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unsigned loop;
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__be32 *b;
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int ret;
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_enter("{%u}", call->unmarshall);
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switch (call->unmarshall) {
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case 0:
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call->offset = 0;
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call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
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if (!call->buffer)
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return -ENOMEM;
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call->unmarshall++;
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case 1:
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_debug("extract UUID");
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ret = afs_extract_data(call, call->buffer,
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11 * sizeof(__be32), false);
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switch (ret) {
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case 0: break;
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case -EAGAIN: return 0;
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default: return ret;
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}
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_debug("unmarshall UUID");
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call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
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if (!call->request)
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return -ENOMEM;
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b = call->buffer;
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r = call->request;
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r->time_low = b[0];
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r->time_mid = htons(ntohl(b[1]));
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r->time_hi_and_version = htons(ntohl(b[2]));
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r->clock_seq_hi_and_reserved = ntohl(b[3]);
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r->clock_seq_low = ntohl(b[4]);
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for (loop = 0; loop < 6; loop++)
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r->node[loop] = ntohl(b[loop + 5]);
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call->offset = 0;
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call->unmarshall++;
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case 2:
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break;
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}
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if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
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return -EIO;
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return afs_queue_call_work(call);
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}
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/*
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* allow the fileserver to ask about the cache manager's capabilities
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*/
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static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
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{
|
|
struct afs_interface *ifs;
|
|
struct afs_call *call = container_of(work, struct afs_call, work);
|
|
int loop, nifs;
|
|
|
|
struct {
|
|
struct /* InterfaceAddr */ {
|
|
__be32 nifs;
|
|
__be32 uuid[11];
|
|
__be32 ifaddr[32];
|
|
__be32 netmask[32];
|
|
__be32 mtu[32];
|
|
} ia;
|
|
struct /* Capabilities */ {
|
|
__be32 capcount;
|
|
__be32 caps[1];
|
|
} cap;
|
|
} reply;
|
|
|
|
_enter("");
|
|
|
|
nifs = 0;
|
|
ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
|
|
if (ifs) {
|
|
nifs = afs_get_ipv4_interfaces(call->net, ifs, 32, false);
|
|
if (nifs < 0) {
|
|
kfree(ifs);
|
|
ifs = NULL;
|
|
nifs = 0;
|
|
}
|
|
}
|
|
|
|
memset(&reply, 0, sizeof(reply));
|
|
reply.ia.nifs = htonl(nifs);
|
|
|
|
reply.ia.uuid[0] = call->net->uuid.time_low;
|
|
reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
|
|
reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
|
|
reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
|
|
reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
|
|
for (loop = 0; loop < 6; loop++)
|
|
reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
|
|
|
|
if (ifs) {
|
|
for (loop = 0; loop < nifs; loop++) {
|
|
reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
|
|
reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
|
|
reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
|
|
}
|
|
kfree(ifs);
|
|
}
|
|
|
|
reply.cap.capcount = htonl(1);
|
|
reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
|
|
afs_send_simple_reply(call, &reply, sizeof(reply));
|
|
afs_put_call(call);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* deliver request data to a CB.TellMeAboutYourself call
|
|
*/
|
|
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
|
|
{
|
|
int ret;
|
|
|
|
_enter("");
|
|
|
|
ret = afs_extract_data(call, NULL, 0, false);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
|
|
return -EIO;
|
|
|
|
return afs_queue_call_work(call);
|
|
}
|