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![Tejun Heo](/assets/img/avatar_default.png)
flush_scheduled_work() is going away. afs needs to make sure all the works it has queued have finished before being unloaded and there can be arbitrary number of pending works. Add afs_wq and use it as the flush domain instead of the system workqueue. Also, convert cancel_delayed_work() + flush_scheduled_work() to cancel_delayed_work_sync() in afs_mntpt_kill_timer(). Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: David Howells <dhowells@redhat.com> Cc: linux-afs@lists.infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
585 lines
13 KiB
C
585 lines
13 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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#if 0
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struct workqueue_struct *afs_cm_workqueue;
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#endif /* 0 */
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static int afs_deliver_cb_init_call_back_state(struct afs_call *,
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struct sk_buff *, bool);
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static int afs_deliver_cb_init_call_back_state3(struct afs_call *,
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struct sk_buff *, bool);
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static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
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static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
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static int afs_deliver_cb_probe_uuid(struct afs_call *, struct sk_buff *, bool);
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static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *,
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struct sk_buff *, bool);
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static void afs_cm_destructor(struct afs_call *);
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/*
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* CB.CallBack operation type
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*/
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static const struct afs_call_type afs_SRXCBCallBack = {
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.name = "CB.CallBack",
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.deliver = afs_deliver_cb_callback,
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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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 const struct afs_call_type afs_SRXCBInitCallBackState = {
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.name = "CB.InitCallBackState",
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.deliver = afs_deliver_cb_init_call_back_state,
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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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 const struct afs_call_type afs_SRXCBInitCallBackState3 = {
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.name = "CB.InitCallBackState3",
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.deliver = afs_deliver_cb_init_call_back_state3,
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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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 const struct afs_call_type afs_SRXCBProbe = {
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.name = "CB.Probe",
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.deliver = afs_deliver_cb_probe,
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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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 const struct afs_call_type afs_SRXCBProbeUuid = {
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.name = "CB.ProbeUuid",
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.deliver = afs_deliver_cb_probe_uuid,
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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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 const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
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.name = "CB.TellMeAboutYourself",
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.deliver = afs_deliver_cb_tell_me_about_yourself,
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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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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u32 operation_id = ntohl(call->operation_ID);
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_enter("{CB.OP %u}", operation_id);
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switch (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 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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_enter("");
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afs_put_server(call->server);
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call->server = NULL;
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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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* allow the fileserver to see if the cache manager is still alive
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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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/* be sure to send the reply *before* attempting to spam the AFS server
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* with FSFetchStatus requests on the vnodes with broken callbacks lest
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* the AFS server get into a vicious cycle of trying to break further
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* callbacks because it hadn't received completion of the CBCallBack op
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* yet */
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afs_send_empty_reply(call);
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afs_break_callbacks(call->server, call->count, call->request);
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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, struct sk_buff *skb,
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bool last)
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{
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struct afs_callback *cb;
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struct afs_server *server;
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struct in_addr addr;
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__be32 *bp;
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u32 tmp;
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int ret, loop;
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_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
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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, skb, last, &call->tmp, 4);
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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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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 -EBADMSG;
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call->buffer = kmalloc(call->count * 3 * 4, 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, skb, last, call->buffer,
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call->count * 3 * 4);
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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 FID array");
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call->request = kcalloc(call->count,
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sizeof(struct afs_callback),
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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->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, skb, last, &call->tmp, 4);
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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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tmp = ntohl(call->tmp);
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_debug("CB count: %u", tmp);
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if (tmp != call->count && tmp != 0)
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return -EBADMSG;
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call->offset = 0;
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call->unmarshall++;
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if (tmp == 0)
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goto empty_cb_array;
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case 4:
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_debug("extract CB array");
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ret = afs_extract_data(call, skb, last, call->request,
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call->count * 3 * 4);
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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 CB array");
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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->version = ntohl(*bp++);
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cb->expiry = ntohl(*bp++);
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cb->type = ntohl(*bp++);
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}
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empty_cb_array:
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call->offset = 0;
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call->unmarshall++;
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case 5:
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_debug("trailer");
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if (skb->len != 0)
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return -EBADMSG;
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break;
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}
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if (!last)
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return 0;
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call->state = AFS_CALL_REPLYING;
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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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memcpy(&addr, &ip_hdr(skb)->saddr, 4);
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server = afs_find_server(&addr);
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if (!server)
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return -ENOTCONN;
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call->server = server;
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INIT_WORK(&call->work, SRXAFSCB_CallBack);
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queue_work(afs_wq, &call->work);
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return 0;
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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->server);
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afs_init_callback_state(call->server);
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afs_send_empty_reply(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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struct sk_buff *skb,
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bool last)
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{
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struct afs_server *server;
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struct in_addr addr;
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_enter(",{%u},%d", skb->len, last);
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if (skb->len > 0)
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return -EBADMSG;
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if (!last)
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return 0;
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/* no unmarshalling required */
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call->state = AFS_CALL_REPLYING;
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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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memcpy(&addr, &ip_hdr(skb)->saddr, 4);
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server = afs_find_server(&addr);
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if (!server)
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return -ENOTCONN;
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call->server = server;
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INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
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queue_work(afs_wq, &call->work);
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return 0;
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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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struct sk_buff *skb,
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bool last)
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{
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struct afs_server *server;
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struct in_addr addr;
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_enter(",{%u},%d", skb->len, last);
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if (!last)
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return 0;
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/* no unmarshalling required */
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call->state = AFS_CALL_REPLYING;
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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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memcpy(&addr, &ip_hdr(skb)->saddr, 4);
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server = afs_find_server(&addr);
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if (!server)
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return -ENOTCONN;
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call->server = server;
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INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
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queue_work(afs_wq, &call->work);
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return 0;
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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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_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, struct sk_buff *skb,
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bool last)
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{
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_enter(",{%u},%d", skb->len, last);
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if (skb->len > 0)
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return -EBADMSG;
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if (!last)
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return 0;
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/* no unmarshalling required */
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call->state = AFS_CALL_REPLYING;
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INIT_WORK(&call->work, SRXAFSCB_Probe);
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queue_work(afs_wq, &call->work);
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return 0;
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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, &afs_uuid, sizeof(afs_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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_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, struct sk_buff *skb,
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bool last)
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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},{%u},%d", call->unmarshall, skb->len, last);
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if (skb->len > 0)
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return -EBADMSG;
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if (!last)
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return 0;
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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(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, skb, last, call->buffer,
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11 * sizeof(__be32));
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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 = ntohl(b[0]);
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r->time_mid = ntohl(b[1]);
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r->time_hi_and_version = 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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_debug("trailer");
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if (skb->len != 0)
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return -EBADMSG;
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break;
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}
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if (!last)
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return 0;
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call->state = AFS_CALL_REPLYING;
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INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
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queue_work(afs_wq, &call->work);
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return 0;
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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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{
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struct afs_interface *ifs;
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struct afs_call *call = container_of(work, struct afs_call, work);
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int loop, nifs;
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struct {
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struct /* InterfaceAddr */ {
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__be32 nifs;
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__be32 uuid[11];
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__be32 ifaddr[32];
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__be32 netmask[32];
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__be32 mtu[32];
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} ia;
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struct /* Capabilities */ {
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__be32 capcount;
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__be32 caps[1];
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} cap;
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} reply;
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_enter("");
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nifs = 0;
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ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
|
|
if (ifs) {
|
|
nifs = afs_get_ipv4_interfaces(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] = htonl(afs_uuid.time_low);
|
|
reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
|
|
reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
|
|
reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
|
|
reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
|
|
for (loop = 0; loop < 6; loop++)
|
|
reply.ia.uuid[loop + 5] = htonl((s8) afs_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));
|
|
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* deliver request data to a CB.TellMeAboutYourself call
|
|
*/
|
|
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call,
|
|
struct sk_buff *skb, bool last)
|
|
{
|
|
_enter(",{%u},%d", skb->len, last);
|
|
|
|
if (skb->len > 0)
|
|
return -EBADMSG;
|
|
if (!last)
|
|
return 0;
|
|
|
|
/* no unmarshalling required */
|
|
call->state = AFS_CALL_REPLYING;
|
|
|
|
INIT_WORK(&call->work, SRXAFSCB_TellMeAboutYourself);
|
|
queue_work(afs_wq, &call->work);
|
|
return 0;
|
|
}
|