diff options
Diffstat (limited to 'fs/afs/cmservice.c')
| -rw-r--r-- | fs/afs/cmservice.c | 672 |
1 files changed, 672 insertions, 0 deletions
diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c new file mode 100644 index 000000000..7dcd59693 --- /dev/null +++ b/fs/afs/cmservice.c @@ -0,0 +1,672 @@ +// 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" + +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, + const char *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, "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->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); +} |