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linux/fs/afs/cmservice.c
David Howells 57af281e53 rxrpc: Tidy up abort generation infrastructure 
Tidy up the abort generation infrastructure in the following ways:

 (1) Create an enum and string mapping table to list the reasons an abort
     might be generated in tracing.

 (2) Replace the 3-char string with the values from (1) in the places that
     use that to log the abort source.  This gets rid of a memcpy() in the
     tracepoint.

 (3) Subsume the rxrpc_rx_eproto tracepoint with the rxrpc_abort tracepoint
     and use values from (1) to indicate the trace reason.

 (4) Always make a call to an abort function at the point of the abort
     rather than stashing the values into variables and using goto to get
     to a place where it reported.  The C optimiser will collapse the calls
     together as appropriate.  The abort functions return a value that can
     be returned directly if appropriate.

Note that this extends into afs also at the points where that generates an
abort.  To aid with this, the afs sources need to #define
RXRPC_TRACE_ONLY_DEFINE_ENUMS before including the rxrpc tracing header
because they don't have access to the rxrpc internal structures that some
of the tracepoints make use of.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
2023-01-06 09:43:32 +00:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/* AFS Cache Manager Service
*
* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#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"
#include "protocol_yfs.h"
#define RXRPC_TRACE_ONLY_DEFINE_ENUMS
#include <trace/events/rxrpc.h>
static int afs_deliver_cb_init_call_back_state(struct afs_call *);
static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
static int afs_deliver_cb_probe(struct afs_call *);
static int afs_deliver_cb_callback(struct afs_call *);
static int afs_deliver_cb_probe_uuid(struct afs_call *);
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
static void afs_cm_destructor(struct afs_call *);
static void SRXAFSCB_CallBack(struct work_struct *);
static void SRXAFSCB_InitCallBackState(struct work_struct *);
static void SRXAFSCB_Probe(struct work_struct *);
static void SRXAFSCB_ProbeUuid(struct work_struct *);
static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
static int afs_deliver_yfs_cb_callback(struct afs_call *);
/*
* CB.CallBack operation type
*/
static const struct afs_call_type afs_SRXCBCallBack = {
.name = "CB.CallBack",
.deliver = afs_deliver_cb_callback,
.destructor = afs_cm_destructor,
.work = SRXAFSCB_CallBack,
};
/*
* CB.InitCallBackState operation type
*/
static const struct afs_call_type afs_SRXCBInitCallBackState = {
.name = "CB.InitCallBackState",
.deliver = afs_deliver_cb_init_call_back_state,
.destructor = afs_cm_destructor,
.work = SRXAFSCB_InitCallBackState,
};
/*
* CB.InitCallBackState3 operation type
*/
static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
.name = "CB.InitCallBackState3",
.deliver = afs_deliver_cb_init_call_back_state3,
.destructor = afs_cm_destructor,
.work = SRXAFSCB_InitCallBackState,
};
/*
* CB.Probe operation type
*/
static const struct afs_call_type afs_SRXCBProbe = {
.name = "CB.Probe",
.deliver = afs_deliver_cb_probe,
.destructor = afs_cm_destructor,
.work = SRXAFSCB_Probe,
};
/*
* CB.ProbeUuid operation type
*/
static const struct afs_call_type afs_SRXCBProbeUuid = {
.name = "CB.ProbeUuid",
.deliver = afs_deliver_cb_probe_uuid,
.destructor = afs_cm_destructor,
.work = SRXAFSCB_ProbeUuid,
};
/*
* CB.TellMeAboutYourself operation type
*/
static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
.name = "CB.TellMeAboutYourself",
.deliver = afs_deliver_cb_tell_me_about_yourself,
.destructor = afs_cm_destructor,
.work = SRXAFSCB_TellMeAboutYourself,
};
/*
* YFS CB.CallBack operation type
*/
static const struct afs_call_type afs_SRXYFSCB_CallBack = {
.name = "YFSCB.CallBack",
.deliver = afs_deliver_yfs_cb_callback,
.destructor = afs_cm_destructor,
.work = SRXAFSCB_CallBack,
};
/*
* route an incoming cache manager call
* - return T if supported, F if not
*/
bool afs_cm_incoming_call(struct afs_call *call)
{
_enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);
switch (call->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 CBProbeUuid:
call->type = &afs_SRXCBProbeUuid;
return true;
case CBTellMeAboutYourself:
call->type = &afs_SRXCBTellMeAboutYourself;
return true;
case YFSCBCallBack:
if (call->service_id != YFS_CM_SERVICE)
return false;
call->type = &afs_SRXYFSCB_CallBack;
return true;
default:
return false;
}
}
/*
* Find the server record by peer address and record a probe to the cache
* manager from a server.
*/
static int afs_find_cm_server_by_peer(struct afs_call *call)
{
struct sockaddr_rxrpc srx;
struct afs_server *server;
rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
server = afs_find_server(call->net, &srx);
if (!server) {
trace_afs_cm_no_server(call, &srx);
return 0;
}
call->server = server;
return 0;
}
/*
* Find the server record by server UUID and record a probe to the cache
* manager from a server.
*/
static int afs_find_cm_server_by_uuid(struct afs_call *call,
struct afs_uuid *uuid)
{
struct afs_server *server;
rcu_read_lock();
server = afs_find_server_by_uuid(call->net, call->request);
rcu_read_unlock();
if (!server) {
trace_afs_cm_no_server_u(call, call->request);
return 0;
}
call->server = server;
return 0;
}
/*
* Clean up a cache manager call.
*/
static void afs_cm_destructor(struct afs_call *call)
{
kfree(call->buffer);
call->buffer = NULL;
}
/*
* Abort a service call from within an action function.
*/
static void afs_abort_service_call(struct afs_call *call, u32 abort_code, int error,
enum rxrpc_abort_reason why)
{
rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
abort_code, error, why);
afs_set_call_complete(call, error, 0);
}
/*
* The server supplied a list of callbacks that it wanted to break.
*/
static void SRXAFSCB_CallBack(struct work_struct *work)
{
struct afs_call *call = container_of(work, struct afs_call, work);
_enter("");
/* We need to break the callbacks before sending the reply as the
* server holds up change visibility till it receives our reply so as
* to maintain cache coherency.
*/
if (call->server) {
trace_afs_server(call->server->debug_id,
refcount_read(&call->server->ref),
atomic_read(&call->server->active),
afs_server_trace_callback);
afs_break_callbacks(call->server, call->count, call->request);
}
afs_send_empty_reply(call);
afs_put_call(call);
_leave("");
}
/*
* deliver request data to a CB.CallBack call
*/
static int afs_deliver_cb_callback(struct afs_call *call)
{
struct afs_callback_break *cb;
__be32 *bp;
int ret, loop;
_enter("{%u}", call->unmarshall);
switch (call->unmarshall) {
case 0:
afs_extract_to_tmp(call);
call->unmarshall++;
/* extract the FID array and its count in two steps */
fallthrough;
case 1:
_debug("extract FID count");
ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
call->count = ntohl(call->tmp);
_debug("FID count: %u", call->count);
if (call->count > AFSCBMAX)
return afs_protocol_error(call, afs_eproto_cb_fid_count);
call->buffer = kmalloc(array3_size(call->count, 3, 4),
GFP_KERNEL);
if (!call->buffer)
return -ENOMEM;
afs_extract_to_buf(call, call->count * 3 * 4);
call->unmarshall++;
fallthrough;
case 2:
_debug("extract FID array");
ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
_debug("unmarshall FID array");
call->request = kcalloc(call->count,
sizeof(struct afs_callback_break),
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++);
}
afs_extract_to_tmp(call);
call->unmarshall++;
/* extract the callback array and its count in two steps */
fallthrough;
case 3:
_debug("extract CB count");
ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
call->count2 = ntohl(call->tmp);
_debug("CB count: %u", call->count2);
if (call->count2 != call->count && call->count2 != 0)
return afs_protocol_error(call, afs_eproto_cb_count);
call->iter = &call->def_iter;
iov_iter_discard(&call->def_iter, ITER_DEST, call->count2 * 3 * 4);
call->unmarshall++;
fallthrough;
case 4:
_debug("extract discard %zu/%u",
iov_iter_count(call->iter), call->count2 * 3 * 4);
ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
call->unmarshall++;
fallthrough;
case 5:
break;
}
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
return afs_io_error(call, afs_io_error_cm_reply);
/* we'll need the file server record as that tells us which set of
* vnodes to operate upon */
return afs_find_cm_server_by_peer(call);
}
/*
* 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);
if (call->server)
afs_init_callback_state(call->server);
afs_send_empty_reply(call);
afs_put_call(call);
_leave("");
}
/*
* deliver request data to a CB.InitCallBackState call
*/
static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
{
int ret;
_enter("");
afs_extract_discard(call, 0);
ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
/* we'll need the file server record as that tells us which set of
* vnodes to operate upon */
return afs_find_cm_server_by_peer(call);
}
/*
* deliver request data to a CB.InitCallBackState3 call
*/
static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
{
struct afs_uuid *r;
unsigned loop;
__be32 *b;
int ret;
_enter("");
_enter("{%u}", call->unmarshall);
switch (call->unmarshall) {
case 0:
call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
if (!call->buffer)
return -ENOMEM;
afs_extract_to_buf(call, 11 * sizeof(__be32));
call->unmarshall++;
fallthrough;
case 1:
_debug("extract UUID");
ret = afs_extract_data(call, false);
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 = b[0];
r->time_mid = htons(ntohl(b[1]));
r->time_hi_and_version = htons(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->unmarshall++;
fallthrough;
case 2:
break;
}
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
return afs_io_error(call, afs_io_error_cm_reply);
/* we'll need the file server record as that tells us which set of
* vnodes to operate upon */
return afs_find_cm_server_by_uuid(call, call->request);
}
/*
* 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);
afs_put_call(call);
_leave("");
}
/*
* deliver request data to a CB.Probe call
*/
static int afs_deliver_cb_probe(struct afs_call *call)
{
int ret;
_enter("");
afs_extract_discard(call, 0);
ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
return afs_io_error(call, afs_io_error_cm_reply);
return afs_find_cm_server_by_peer(call);
}
/*
* Allow the fileserver to quickly find out if the cache manager 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;
_enter("");
if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
afs_send_empty_reply(call);
else
afs_abort_service_call(call, 1, 1, afs_abort_probeuuid_negative);
afs_put_call(call);
_leave("");
}
/*
* deliver request data to a CB.ProbeUuid call
*/
static int afs_deliver_cb_probe_uuid(struct afs_call *call)
{
struct afs_uuid *r;
unsigned loop;
__be32 *b;
int ret;
_enter("{%u}", call->unmarshall);
switch (call->unmarshall) {
case 0:
call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
if (!call->buffer)
return -ENOMEM;
afs_extract_to_buf(call, 11 * sizeof(__be32));
call->unmarshall++;
fallthrough;
case 1:
_debug("extract UUID");
ret = afs_extract_data(call, false);
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 = b[0];
r->time_mid = htons(ntohl(b[1]));
r->time_hi_and_version = htons(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->unmarshall++;
fallthrough;
case 2:
break;
}
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
return afs_io_error(call, afs_io_error_cm_reply);
return afs_find_cm_server_by_peer(call);
}
/*
* allow the fileserver to ask about the cache manager's capabilities
*/
static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
{
struct afs_call *call = container_of(work, struct afs_call, work);
int loop;
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("");
memset(&reply, 0, sizeof(reply));
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]);
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("");
afs_extract_discard(call, 0);
ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
return afs_io_error(call, afs_io_error_cm_reply);
return afs_find_cm_server_by_peer(call);
}
/*
* deliver request data to a YFS CB.CallBack call
*/
static int afs_deliver_yfs_cb_callback(struct afs_call *call)
{
struct afs_callback_break *cb;
struct yfs_xdr_YFSFid *bp;
size_t size;
int ret, loop;
_enter("{%u}", call->unmarshall);
switch (call->unmarshall) {
case 0:
afs_extract_to_tmp(call);
call->unmarshall++;
/* extract the FID array and its count in two steps */
fallthrough;
case 1:
_debug("extract FID count");
ret = afs_extract_data(call, true);
if (ret < 0)
return ret;
call->count = ntohl(call->tmp);
_debug("FID count: %u", call->count);
if (call->count > YFSCBMAX)
return afs_protocol_error(call, afs_eproto_cb_fid_count);
size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
call->buffer = kmalloc(size, GFP_KERNEL);
if (!call->buffer)
return -ENOMEM;
afs_extract_to_buf(call, size);
call->unmarshall++;
fallthrough;
case 2:
_debug("extract FID array");
ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
_debug("unmarshall FID array");
call->request = kcalloc(call->count,
sizeof(struct afs_callback_break),
GFP_KERNEL);
if (!call->request)
return -ENOMEM;
cb = call->request;
bp = call->buffer;
for (loop = call->count; loop > 0; loop--, cb++) {
cb->fid.vid = xdr_to_u64(bp->volume);
cb->fid.vnode = xdr_to_u64(bp->vnode.lo);
cb->fid.vnode_hi = ntohl(bp->vnode.hi);
cb->fid.unique = ntohl(bp->vnode.unique);
bp++;
}
afs_extract_to_tmp(call);
call->unmarshall++;
fallthrough;
case 3:
break;
}
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
return afs_io_error(call, afs_io_error_cm_reply);
/* We'll need the file server record as that tells us which set of
* vnodes to operate upon.
*/
return afs_find_cm_server_by_peer(call);
}
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