mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-14 15:54:15 +08:00
0ad53eeefc
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>
586 lines
13 KiB
C
586 lines
13 KiB
C
/* AFS Cache Manager Service
|
|
*
|
|
* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/ip.h>
|
|
#include "internal.h"
|
|
#include "afs_cm.h"
|
|
|
|
#if 0
|
|
struct workqueue_struct *afs_cm_workqueue;
|
|
#endif /* 0 */
|
|
|
|
static int afs_deliver_cb_init_call_back_state(struct afs_call *,
|
|
struct sk_buff *, bool);
|
|
static int afs_deliver_cb_init_call_back_state3(struct afs_call *,
|
|
struct sk_buff *, bool);
|
|
static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
|
|
static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
|
|
static int afs_deliver_cb_probe_uuid(struct afs_call *, struct sk_buff *, bool);
|
|
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *,
|
|
struct sk_buff *, bool);
|
|
static void afs_cm_destructor(struct afs_call *);
|
|
|
|
/*
|
|
* CB.CallBack operation type
|
|
*/
|
|
static const struct afs_call_type afs_SRXCBCallBack = {
|
|
.name = "CB.CallBack",
|
|
.deliver = afs_deliver_cb_callback,
|
|
.abort_to_error = afs_abort_to_error,
|
|
.destructor = afs_cm_destructor,
|
|
};
|
|
|
|
/*
|
|
* CB.InitCallBackState operation type
|
|
*/
|
|
static const struct afs_call_type afs_SRXCBInitCallBackState = {
|
|
.name = "CB.InitCallBackState",
|
|
.deliver = afs_deliver_cb_init_call_back_state,
|
|
.abort_to_error = afs_abort_to_error,
|
|
.destructor = afs_cm_destructor,
|
|
};
|
|
|
|
/*
|
|
* CB.InitCallBackState3 operation type
|
|
*/
|
|
static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
|
|
.name = "CB.InitCallBackState3",
|
|
.deliver = afs_deliver_cb_init_call_back_state3,
|
|
.abort_to_error = afs_abort_to_error,
|
|
.destructor = afs_cm_destructor,
|
|
};
|
|
|
|
/*
|
|
* CB.Probe operation type
|
|
*/
|
|
static const struct afs_call_type afs_SRXCBProbe = {
|
|
.name = "CB.Probe",
|
|
.deliver = afs_deliver_cb_probe,
|
|
.abort_to_error = afs_abort_to_error,
|
|
.destructor = afs_cm_destructor,
|
|
};
|
|
|
|
/*
|
|
* CB.ProbeUuid operation type
|
|
*/
|
|
static const struct afs_call_type afs_SRXCBProbeUuid = {
|
|
.name = "CB.ProbeUuid",
|
|
.deliver = afs_deliver_cb_probe_uuid,
|
|
.abort_to_error = afs_abort_to_error,
|
|
.destructor = afs_cm_destructor,
|
|
};
|
|
|
|
/*
|
|
* CB.TellMeAboutYourself operation type
|
|
*/
|
|
static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
|
|
.name = "CB.TellMeAboutYourself",
|
|
.deliver = afs_deliver_cb_tell_me_about_yourself,
|
|
.abort_to_error = afs_abort_to_error,
|
|
.destructor = afs_cm_destructor,
|
|
};
|
|
|
|
/*
|
|
* route an incoming cache manager call
|
|
* - return T if supported, F if not
|
|
*/
|
|
bool afs_cm_incoming_call(struct afs_call *call)
|
|
{
|
|
u32 operation_id = ntohl(call->operation_ID);
|
|
|
|
_enter("{CB.OP %u}", operation_id);
|
|
|
|
switch (operation_id) {
|
|
case CBCallBack:
|
|
call->type = &afs_SRXCBCallBack;
|
|
return true;
|
|
case CBInitCallBackState:
|
|
call->type = &afs_SRXCBInitCallBackState;
|
|
return true;
|
|
case CBInitCallBackState3:
|
|
call->type = &afs_SRXCBInitCallBackState3;
|
|
return true;
|
|
case CBProbe:
|
|
call->type = &afs_SRXCBProbe;
|
|
return true;
|
|
case CBTellMeAboutYourself:
|
|
call->type = &afs_SRXCBTellMeAboutYourself;
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* clean up a cache manager call
|
|
*/
|
|
static void afs_cm_destructor(struct afs_call *call)
|
|
{
|
|
_enter("");
|
|
|
|
afs_put_server(call->server);
|
|
call->server = NULL;
|
|
kfree(call->buffer);
|
|
call->buffer = NULL;
|
|
}
|
|
|
|
/*
|
|
* allow the fileserver to see if the cache manager is still alive
|
|
*/
|
|
static void SRXAFSCB_CallBack(struct work_struct *work)
|
|
{
|
|
struct afs_call *call = container_of(work, struct afs_call, work);
|
|
|
|
_enter("");
|
|
|
|
/* be sure to send the reply *before* attempting to spam the AFS server
|
|
* with FSFetchStatus requests on the vnodes with broken callbacks lest
|
|
* the AFS server get into a vicious cycle of trying to break further
|
|
* callbacks because it hadn't received completion of the CBCallBack op
|
|
* yet */
|
|
afs_send_empty_reply(call);
|
|
|
|
afs_break_callbacks(call->server, call->count, call->request);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* deliver request data to a CB.CallBack call
|
|
*/
|
|
static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
|
|
bool last)
|
|
{
|
|
struct afs_callback *cb;
|
|
struct afs_server *server;
|
|
struct in_addr addr;
|
|
__be32 *bp;
|
|
u32 tmp;
|
|
int ret, loop;
|
|
|
|
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
|
|
|
|
switch (call->unmarshall) {
|
|
case 0:
|
|
call->offset = 0;
|
|
call->unmarshall++;
|
|
|
|
/* extract the FID array and its count in two steps */
|
|
case 1:
|
|
_debug("extract FID count");
|
|
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
|
|
switch (ret) {
|
|
case 0: break;
|
|
case -EAGAIN: return 0;
|
|
default: return ret;
|
|
}
|
|
|
|
call->count = ntohl(call->tmp);
|
|
_debug("FID count: %u", call->count);
|
|
if (call->count > AFSCBMAX)
|
|
return -EBADMSG;
|
|
|
|
call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
|
|
if (!call->buffer)
|
|
return -ENOMEM;
|
|
call->offset = 0;
|
|
call->unmarshall++;
|
|
|
|
case 2:
|
|
_debug("extract FID array");
|
|
ret = afs_extract_data(call, skb, last, call->buffer,
|
|
call->count * 3 * 4);
|
|
switch (ret) {
|
|
case 0: break;
|
|
case -EAGAIN: return 0;
|
|
default: return ret;
|
|
}
|
|
|
|
_debug("unmarshall FID array");
|
|
call->request = kcalloc(call->count,
|
|
sizeof(struct afs_callback),
|
|
GFP_KERNEL);
|
|
if (!call->request)
|
|
return -ENOMEM;
|
|
|
|
cb = call->request;
|
|
bp = call->buffer;
|
|
for (loop = call->count; loop > 0; loop--, cb++) {
|
|
cb->fid.vid = ntohl(*bp++);
|
|
cb->fid.vnode = ntohl(*bp++);
|
|
cb->fid.unique = ntohl(*bp++);
|
|
cb->type = AFSCM_CB_UNTYPED;
|
|
}
|
|
|
|
call->offset = 0;
|
|
call->unmarshall++;
|
|
|
|
/* extract the callback array and its count in two steps */
|
|
case 3:
|
|
_debug("extract CB count");
|
|
ret = afs_extract_data(call, skb, last, &call->tmp, 4);
|
|
switch (ret) {
|
|
case 0: break;
|
|
case -EAGAIN: return 0;
|
|
default: return ret;
|
|
}
|
|
|
|
tmp = ntohl(call->tmp);
|
|
_debug("CB count: %u", tmp);
|
|
if (tmp != call->count && tmp != 0)
|
|
return -EBADMSG;
|
|
call->offset = 0;
|
|
call->unmarshall++;
|
|
if (tmp == 0)
|
|
goto empty_cb_array;
|
|
|
|
case 4:
|
|
_debug("extract CB array");
|
|
ret = afs_extract_data(call, skb, last, call->request,
|
|
call->count * 3 * 4);
|
|
switch (ret) {
|
|
case 0: break;
|
|
case -EAGAIN: return 0;
|
|
default: return ret;
|
|
}
|
|
|
|
_debug("unmarshall CB array");
|
|
cb = call->request;
|
|
bp = call->buffer;
|
|
for (loop = call->count; loop > 0; loop--, cb++) {
|
|
cb->version = ntohl(*bp++);
|
|
cb->expiry = ntohl(*bp++);
|
|
cb->type = ntohl(*bp++);
|
|
}
|
|
|
|
empty_cb_array:
|
|
call->offset = 0;
|
|
call->unmarshall++;
|
|
|
|
case 5:
|
|
_debug("trailer");
|
|
if (skb->len != 0)
|
|
return -EBADMSG;
|
|
break;
|
|
}
|
|
|
|
if (!last)
|
|
return 0;
|
|
|
|
call->state = AFS_CALL_REPLYING;
|
|
|
|
/* we'll need the file server record as that tells us which set of
|
|
* vnodes to operate upon */
|
|
memcpy(&addr, &ip_hdr(skb)->saddr, 4);
|
|
server = afs_find_server(&addr);
|
|
if (!server)
|
|
return -ENOTCONN;
|
|
call->server = server;
|
|
|
|
INIT_WORK(&call->work, SRXAFSCB_CallBack);
|
|
queue_work(afs_wq, &call->work);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* allow the fileserver to request callback state (re-)initialisation
|
|
*/
|
|
static void SRXAFSCB_InitCallBackState(struct work_struct *work)
|
|
{
|
|
struct afs_call *call = container_of(work, struct afs_call, work);
|
|
|
|
_enter("{%p}", call->server);
|
|
|
|
afs_init_callback_state(call->server);
|
|
afs_send_empty_reply(call);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* deliver request data to a CB.InitCallBackState call
|
|
*/
|
|
static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
|
|
struct sk_buff *skb,
|
|
bool last)
|
|
{
|
|
struct afs_server *server;
|
|
struct in_addr addr;
|
|
|
|
_enter(",{%u},%d", skb->len, last);
|
|
|
|
if (skb->len > 0)
|
|
return -EBADMSG;
|
|
if (!last)
|
|
return 0;
|
|
|
|
/* no unmarshalling required */
|
|
call->state = AFS_CALL_REPLYING;
|
|
|
|
/* we'll need the file server record as that tells us which set of
|
|
* vnodes to operate upon */
|
|
memcpy(&addr, &ip_hdr(skb)->saddr, 4);
|
|
server = afs_find_server(&addr);
|
|
if (!server)
|
|
return -ENOTCONN;
|
|
call->server = server;
|
|
|
|
INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
|
|
queue_work(afs_wq, &call->work);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* deliver request data to a CB.InitCallBackState3 call
|
|
*/
|
|
static int afs_deliver_cb_init_call_back_state3(struct afs_call *call,
|
|
struct sk_buff *skb,
|
|
bool last)
|
|
{
|
|
struct afs_server *server;
|
|
struct in_addr addr;
|
|
|
|
_enter(",{%u},%d", skb->len, last);
|
|
|
|
if (!last)
|
|
return 0;
|
|
|
|
/* no unmarshalling required */
|
|
call->state = AFS_CALL_REPLYING;
|
|
|
|
/* we'll need the file server record as that tells us which set of
|
|
* vnodes to operate upon */
|
|
memcpy(&addr, &ip_hdr(skb)->saddr, 4);
|
|
server = afs_find_server(&addr);
|
|
if (!server)
|
|
return -ENOTCONN;
|
|
call->server = server;
|
|
|
|
INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
|
|
queue_work(afs_wq, &call->work);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* allow the fileserver to see if the cache manager is still alive
|
|
*/
|
|
static void SRXAFSCB_Probe(struct work_struct *work)
|
|
{
|
|
struct afs_call *call = container_of(work, struct afs_call, work);
|
|
|
|
_enter("");
|
|
afs_send_empty_reply(call);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* deliver request data to a CB.Probe call
|
|
*/
|
|
static int afs_deliver_cb_probe(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_Probe);
|
|
queue_work(afs_wq, &call->work);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* allow the fileserver to quickly find out if the fileserver has been rebooted
|
|
*/
|
|
static void SRXAFSCB_ProbeUuid(struct work_struct *work)
|
|
{
|
|
struct afs_call *call = container_of(work, struct afs_call, work);
|
|
struct afs_uuid *r = call->request;
|
|
|
|
struct {
|
|
__be32 match;
|
|
} reply;
|
|
|
|
_enter("");
|
|
|
|
|
|
if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
|
|
reply.match = htonl(0);
|
|
else
|
|
reply.match = htonl(1);
|
|
|
|
afs_send_simple_reply(call, &reply, sizeof(reply));
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* deliver request data to a CB.ProbeUuid call
|
|
*/
|
|
static int afs_deliver_cb_probe_uuid(struct afs_call *call, struct sk_buff *skb,
|
|
bool last)
|
|
{
|
|
struct afs_uuid *r;
|
|
unsigned loop;
|
|
__be32 *b;
|
|
int ret;
|
|
|
|
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
|
|
|
|
if (skb->len > 0)
|
|
return -EBADMSG;
|
|
if (!last)
|
|
return 0;
|
|
|
|
switch (call->unmarshall) {
|
|
case 0:
|
|
call->offset = 0;
|
|
call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
|
|
if (!call->buffer)
|
|
return -ENOMEM;
|
|
call->unmarshall++;
|
|
|
|
case 1:
|
|
_debug("extract UUID");
|
|
ret = afs_extract_data(call, skb, last, call->buffer,
|
|
11 * sizeof(__be32));
|
|
switch (ret) {
|
|
case 0: break;
|
|
case -EAGAIN: return 0;
|
|
default: return ret;
|
|
}
|
|
|
|
_debug("unmarshall UUID");
|
|
call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
|
|
if (!call->request)
|
|
return -ENOMEM;
|
|
|
|
b = call->buffer;
|
|
r = call->request;
|
|
r->time_low = ntohl(b[0]);
|
|
r->time_mid = ntohl(b[1]);
|
|
r->time_hi_and_version = ntohl(b[2]);
|
|
r->clock_seq_hi_and_reserved = ntohl(b[3]);
|
|
r->clock_seq_low = ntohl(b[4]);
|
|
|
|
for (loop = 0; loop < 6; loop++)
|
|
r->node[loop] = ntohl(b[loop + 5]);
|
|
|
|
call->offset = 0;
|
|
call->unmarshall++;
|
|
|
|
case 2:
|
|
_debug("trailer");
|
|
if (skb->len != 0)
|
|
return -EBADMSG;
|
|
break;
|
|
}
|
|
|
|
if (!last)
|
|
return 0;
|
|
|
|
call->state = AFS_CALL_REPLYING;
|
|
|
|
INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
|
|
queue_work(afs_wq, &call->work);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* allow the fileserver to ask about the cache manager's capabilities
|
|
*/
|
|
static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
|
|
{
|
|
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(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;
|
|
}
|