diff options
Diffstat (limited to 'fs/afs/cmservice.c')
| -rw-r--r-- | fs/afs/cmservice.c | 577 |
1 files changed, 577 insertions, 0 deletions
diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c new file mode 100644 index 000000000..40c6860d4 --- /dev/null +++ b/fs/afs/cmservice.c @@ -0,0 +1,577 @@ +/* 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" + +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 *); + +#define CM_NAME(name) \ + const char afs_SRXCB##name##_name[] __tracepoint_string = \ + "CB." #name + +/* + * CB.CallBack operation type + */ +static CM_NAME(CallBack); +static const struct afs_call_type afs_SRXCBCallBack = { + .name = afs_SRXCBCallBack_name, + .deliver = afs_deliver_cb_callback, + .destructor = afs_cm_destructor, + .work = SRXAFSCB_CallBack, +}; + +/* + * CB.InitCallBackState operation type + */ +static CM_NAME(InitCallBackState); +static const struct afs_call_type afs_SRXCBInitCallBackState = { + .name = afs_SRXCBInitCallBackState_name, + .deliver = afs_deliver_cb_init_call_back_state, + .destructor = afs_cm_destructor, + .work = SRXAFSCB_InitCallBackState, +}; + +/* + * CB.InitCallBackState3 operation type + */ +static CM_NAME(InitCallBackState3); +static const struct afs_call_type afs_SRXCBInitCallBackState3 = { + .name = afs_SRXCBInitCallBackState3_name, + .deliver = afs_deliver_cb_init_call_back_state3, + .destructor = afs_cm_destructor, + .work = SRXAFSCB_InitCallBackState, +}; + +/* + * CB.Probe operation type + */ +static CM_NAME(Probe); +static const struct afs_call_type afs_SRXCBProbe = { + .name = afs_SRXCBProbe_name, + .deliver = afs_deliver_cb_probe, + .destructor = afs_cm_destructor, + .work = SRXAFSCB_Probe, +}; + +/* + * CB.ProbeUuid operation type + */ +static CM_NAME(ProbeUuid); +static const struct afs_call_type afs_SRXCBProbeUuid = { + .name = afs_SRXCBProbeUuid_name, + .deliver = afs_deliver_cb_probe_uuid, + .destructor = afs_cm_destructor, + .work = SRXAFSCB_ProbeUuid, +}; + +/* + * CB.TellMeAboutYourself operation type + */ +static CM_NAME(TellMeAboutYourself); +static const struct afs_call_type afs_SRXCBTellMeAboutYourself = { + .name = afs_SRXCBTellMeAboutYourself_name, + .deliver = afs_deliver_cb_tell_me_about_yourself, + .destructor = afs_cm_destructor, + .work = SRXAFSCB_TellMeAboutYourself, +}; + +/* + * route an incoming cache manager call + * - return T if supported, F if not + */ +bool afs_cm_incoming_call(struct afs_call *call) +{ + _enter("{CB.OP %u}", 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; + default: + return false; + } +} + +/* + * Clean up a cache manager call. + */ +static void afs_cm_destructor(struct afs_call *call) +{ + kfree(call->buffer); + call->buffer = NULL; +} + +/* + * 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->cm_server) + afs_break_callbacks(call->cm_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; + struct sockaddr_rxrpc srx; + __be32 *bp; + int ret, loop; + + _enter("{%u}", call->unmarshall); + + 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, &call->tmp, 4, 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, -EBADMSG); + + call->buffer = kmalloc(array3_size(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, call->buffer, + call->count * 3 * 4, 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++); + cb->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, &call->tmp, 4, 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, -EBADMSG); + call->offset = 0; + call->unmarshall++; + + case 4: + _debug("extract CB array"); + ret = afs_extract_data(call, call->buffer, + call->count2 * 3 * 4, false); + if (ret < 0) + return ret; + + _debug("unmarshall CB array"); + cb = call->request; + bp = call->buffer; + for (loop = call->count2; loop > 0; loop--, cb++) { + cb->cb.version = ntohl(*bp++); + cb->cb.expiry = ntohl(*bp++); + cb->cb.type = ntohl(*bp++); + } + + call->offset = 0; + call->unmarshall++; + case 5: + break; + } + + if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) + return -EIO; + + /* we'll need the file server record as that tells us which set of + * vnodes to operate upon */ + rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx); + call->cm_server = afs_find_server(call->net, &srx); + if (!call->cm_server) + trace_afs_cm_no_server(call, &srx); + + return afs_queue_call_work(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->cm_server); + + if (call->cm_server) + afs_init_callback_state(call->cm_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) +{ + struct sockaddr_rxrpc srx; + int ret; + + _enter(""); + + rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx); + + ret = afs_extract_data(call, NULL, 0, false); + if (ret < 0) + return ret; + + /* we'll need the file server record as that tells us which set of + * vnodes to operate upon */ + call->cm_server = afs_find_server(call->net, &srx); + if (!call->cm_server) + trace_afs_cm_no_server(call, &srx); + + return afs_queue_call_work(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->offset = 0; + call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL); + if (!call->buffer) + return -ENOMEM; + call->unmarshall++; + + case 1: + _debug("extract UUID"); + ret = afs_extract_data(call, call->buffer, + 11 * sizeof(__be32), 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->offset = 0; + call->unmarshall++; + + case 2: + break; + } + + if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) + return -EIO; + + /* we'll need the file server record as that tells us which set of + * vnodes to operate upon */ + rcu_read_lock(); + call->cm_server = afs_find_server_by_uuid(call->net, call->request); + rcu_read_unlock(); + if (!call->cm_server) + trace_afs_cm_no_server_u(call, call->request); + + return afs_queue_call_work(call); +} + +/* + * 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(""); + + 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); +} + +/* + * 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; + + _enter(""); + + if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0) + afs_send_empty_reply(call); + else + rxrpc_kernel_abort_call(call->net->socket, call->rxcall, + 1, 1, "K-1"); + + 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->offset = 0; + call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL); + if (!call->buffer) + return -ENOMEM; + call->unmarshall++; + + case 1: + _debug("extract UUID"); + ret = afs_extract_data(call, call->buffer, + 11 * sizeof(__be32), 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->offset = 0; + call->unmarshall++; + + case 2: + break; + } + + if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) + return -EIO; + + return afs_queue_call_work(call); +} + +/* + * 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(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); +} |