diff options
Diffstat (limited to 'fs/afs/vlclient.c')
| -rw-r--r-- | fs/afs/vlclient.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/fs/afs/vlclient.c b/fs/afs/vlclient.c new file mode 100644 index 00000000000..7b0e3192ee3 --- /dev/null +++ b/fs/afs/vlclient.c @@ -0,0 +1,695 @@ +/* vlclient.c: AFS Volume Location Service client + * + * 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/init.h> +#include <linux/sched.h> +#include <rxrpc/rxrpc.h> +#include <rxrpc/transport.h> +#include <rxrpc/connection.h> +#include <rxrpc/call.h> +#include "server.h" +#include "volume.h" +#include "vlclient.h" +#include "kafsasyncd.h" +#include "kafstimod.h" +#include "errors.h" +#include "internal.h" + +#define VLGETENTRYBYID 503 /* AFS Get Cache Entry By ID operation ID */ +#define VLGETENTRYBYNAME 504 /* AFS Get Cache Entry By Name operation ID */ +#define VLPROBE 514 /* AFS Probe Volume Location Service operation ID */ + +static void afs_rxvl_get_entry_by_id_attn(struct rxrpc_call *call); +static void afs_rxvl_get_entry_by_id_error(struct rxrpc_call *call); + +/*****************************************************************************/ +/* + * map afs VL abort codes to/from Linux error codes + * - called with call->lock held + */ +static void afs_rxvl_aemap(struct rxrpc_call *call) +{ + int err; + + _enter("{%u,%u,%d}", + call->app_err_state, call->app_abort_code, call->app_errno); + + switch (call->app_err_state) { + case RXRPC_ESTATE_LOCAL_ABORT: + call->app_abort_code = -call->app_errno; + return; + + case RXRPC_ESTATE_PEER_ABORT: + switch (call->app_abort_code) { + case AFSVL_IDEXIST: err = -EEXIST; break; + case AFSVL_IO: err = -EREMOTEIO; break; + case AFSVL_NAMEEXIST: err = -EEXIST; break; + case AFSVL_CREATEFAIL: err = -EREMOTEIO; break; + case AFSVL_NOENT: err = -ENOMEDIUM; break; + case AFSVL_EMPTY: err = -ENOMEDIUM; break; + case AFSVL_ENTDELETED: err = -ENOMEDIUM; break; + case AFSVL_BADNAME: err = -EINVAL; break; + case AFSVL_BADINDEX: err = -EINVAL; break; + case AFSVL_BADVOLTYPE: err = -EINVAL; break; + case AFSVL_BADSERVER: err = -EINVAL; break; + case AFSVL_BADPARTITION: err = -EINVAL; break; + case AFSVL_REPSFULL: err = -EFBIG; break; + case AFSVL_NOREPSERVER: err = -ENOENT; break; + case AFSVL_DUPREPSERVER: err = -EEXIST; break; + case AFSVL_RWNOTFOUND: err = -ENOENT; break; + case AFSVL_BADREFCOUNT: err = -EINVAL; break; + case AFSVL_SIZEEXCEEDED: err = -EINVAL; break; + case AFSVL_BADENTRY: err = -EINVAL; break; + case AFSVL_BADVOLIDBUMP: err = -EINVAL; break; + case AFSVL_IDALREADYHASHED: err = -EINVAL; break; + case AFSVL_ENTRYLOCKED: err = -EBUSY; break; + case AFSVL_BADVOLOPER: err = -EBADRQC; break; + case AFSVL_BADRELLOCKTYPE: err = -EINVAL; break; + case AFSVL_RERELEASE: err = -EREMOTEIO; break; + case AFSVL_BADSERVERFLAG: err = -EINVAL; break; + case AFSVL_PERM: err = -EACCES; break; + case AFSVL_NOMEM: err = -EREMOTEIO; break; + default: + err = afs_abort_to_error(call->app_abort_code); + break; + } + call->app_errno = err; + return; + + default: + return; + } +} /* end afs_rxvl_aemap() */ + +#if 0 +/*****************************************************************************/ +/* + * probe a volume location server to see if it is still alive -- unused + */ +static int afs_rxvl_probe(struct afs_server *server, int alloc_flags) +{ + struct rxrpc_connection *conn; + struct rxrpc_call *call; + struct kvec piov[1]; + size_t sent; + int ret; + __be32 param[1]; + + DECLARE_WAITQUEUE(myself, current); + + /* get hold of the vlserver connection */ + ret = afs_server_get_vlconn(server, &conn); + if (ret < 0) + goto out; + + /* create a call through that connection */ + ret = rxrpc_create_call(conn, NULL, NULL, afs_rxvl_aemap, &call); + if (ret < 0) { + printk("kAFS: Unable to create call: %d\n", ret); + goto out_put_conn; + } + call->app_opcode = VLPROBE; + + /* we want to get event notifications from the call */ + add_wait_queue(&call->waitq, &myself); + + /* marshall the parameters */ + param[0] = htonl(VLPROBE); + piov[0].iov_len = sizeof(param); + piov[0].iov_base = param; + + /* send the parameters to the server */ + ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET, + alloc_flags, 0, &sent); + if (ret < 0) + goto abort; + + /* wait for the reply to completely arrive */ + for (;;) { + set_current_state(TASK_INTERRUPTIBLE); + if (call->app_call_state != RXRPC_CSTATE_CLNT_RCV_REPLY || + signal_pending(current)) + break; + schedule(); + } + set_current_state(TASK_RUNNING); + + ret = -EINTR; + if (signal_pending(current)) + goto abort; + + switch (call->app_call_state) { + case RXRPC_CSTATE_ERROR: + ret = call->app_errno; + goto out_unwait; + + case RXRPC_CSTATE_CLNT_GOT_REPLY: + ret = 0; + goto out_unwait; + + default: + BUG(); + } + + abort: + set_current_state(TASK_UNINTERRUPTIBLE); + rxrpc_call_abort(call, ret); + schedule(); + + out_unwait: + set_current_state(TASK_RUNNING); + remove_wait_queue(&call->waitq, &myself); + rxrpc_put_call(call); + out_put_conn: + rxrpc_put_connection(conn); + out: + return ret; + +} /* end afs_rxvl_probe() */ +#endif + +/*****************************************************************************/ +/* + * look up a volume location database entry by name + */ +int afs_rxvl_get_entry_by_name(struct afs_server *server, + const char *volname, + unsigned volnamesz, + struct afs_cache_vlocation *entry) +{ + DECLARE_WAITQUEUE(myself, current); + + struct rxrpc_connection *conn; + struct rxrpc_call *call; + struct kvec piov[3]; + unsigned tmp; + size_t sent; + int ret, loop; + __be32 *bp, param[2], zero; + + _enter(",%*.*s,%u,", volnamesz, volnamesz, volname, volnamesz); + + memset(entry, 0, sizeof(*entry)); + + /* get hold of the vlserver connection */ + ret = afs_server_get_vlconn(server, &conn); + if (ret < 0) + goto out; + + /* create a call through that connection */ + ret = rxrpc_create_call(conn, NULL, NULL, afs_rxvl_aemap, &call); + if (ret < 0) { + printk("kAFS: Unable to create call: %d\n", ret); + goto out_put_conn; + } + call->app_opcode = VLGETENTRYBYNAME; + + /* we want to get event notifications from the call */ + add_wait_queue(&call->waitq, &myself); + + /* marshall the parameters */ + piov[1].iov_len = volnamesz; + piov[1].iov_base = (char *) volname; + + zero = 0; + piov[2].iov_len = (4 - (piov[1].iov_len & 3)) & 3; + piov[2].iov_base = &zero; + + param[0] = htonl(VLGETENTRYBYNAME); + param[1] = htonl(piov[1].iov_len); + + piov[0].iov_len = sizeof(param); + piov[0].iov_base = param; + + /* send the parameters to the server */ + ret = rxrpc_call_write_data(call, 3, piov, RXRPC_LAST_PACKET, GFP_NOFS, + 0, &sent); + if (ret < 0) + goto abort; + + /* wait for the reply to completely arrive */ + bp = rxrpc_call_alloc_scratch(call, 384); + + ret = rxrpc_call_read_data(call, bp, 384, + RXRPC_CALL_READ_BLOCK | + RXRPC_CALL_READ_ALL); + if (ret < 0) { + if (ret == -ECONNABORTED) { + ret = call->app_errno; + goto out_unwait; + } + goto abort; + } + + /* unmarshall the reply */ + for (loop = 0; loop < 64; loop++) + entry->name[loop] = ntohl(*bp++); + bp++; /* final NUL */ + + bp++; /* type */ + entry->nservers = ntohl(*bp++); + + for (loop = 0; loop < 8; loop++) + entry->servers[loop].s_addr = *bp++; + + bp += 8; /* partition IDs */ + + for (loop = 0; loop < 8; loop++) { + tmp = ntohl(*bp++); + if (tmp & AFS_VLSF_RWVOL) + entry->srvtmask[loop] |= AFS_VOL_VTM_RW; + if (tmp & AFS_VLSF_ROVOL) + entry->srvtmask[loop] |= AFS_VOL_VTM_RO; + if (tmp & AFS_VLSF_BACKVOL) + entry->srvtmask[loop] |= AFS_VOL_VTM_BAK; + } + + entry->vid[0] = ntohl(*bp++); + entry->vid[1] = ntohl(*bp++); + entry->vid[2] = ntohl(*bp++); + + bp++; /* clone ID */ + + tmp = ntohl(*bp++); /* flags */ + if (tmp & AFS_VLF_RWEXISTS) + entry->vidmask |= AFS_VOL_VTM_RW; + if (tmp & AFS_VLF_ROEXISTS) + entry->vidmask |= AFS_VOL_VTM_RO; + if (tmp & AFS_VLF_BACKEXISTS) + entry->vidmask |= AFS_VOL_VTM_BAK; + + ret = -ENOMEDIUM; + if (!entry->vidmask) + goto abort; + + /* success */ + entry->rtime = get_seconds(); + ret = 0; + + out_unwait: + set_current_state(TASK_RUNNING); + remove_wait_queue(&call->waitq, &myself); + rxrpc_put_call(call); + out_put_conn: + rxrpc_put_connection(conn); + out: + _leave(" = %d", ret); + return ret; + + abort: + set_current_state(TASK_UNINTERRUPTIBLE); + rxrpc_call_abort(call, ret); + schedule(); + goto out_unwait; +} /* end afs_rxvl_get_entry_by_name() */ + +/*****************************************************************************/ +/* + * look up a volume location database entry by ID + */ +int afs_rxvl_get_entry_by_id(struct afs_server *server, + afs_volid_t volid, + afs_voltype_t voltype, + struct afs_cache_vlocation *entry) +{ + DECLARE_WAITQUEUE(myself, current); + + struct rxrpc_connection *conn; + struct rxrpc_call *call; + struct kvec piov[1]; + unsigned tmp; + size_t sent; + int ret, loop; + __be32 *bp, param[3]; + + _enter(",%x,%d,", volid, voltype); + + memset(entry, 0, sizeof(*entry)); + + /* get hold of the vlserver connection */ + ret = afs_server_get_vlconn(server, &conn); + if (ret < 0) + goto out; + + /* create a call through that connection */ + ret = rxrpc_create_call(conn, NULL, NULL, afs_rxvl_aemap, &call); + if (ret < 0) { + printk("kAFS: Unable to create call: %d\n", ret); + goto out_put_conn; + } + call->app_opcode = VLGETENTRYBYID; + + /* we want to get event notifications from the call */ + add_wait_queue(&call->waitq, &myself); + + /* marshall the parameters */ + param[0] = htonl(VLGETENTRYBYID); + param[1] = htonl(volid); + param[2] = htonl(voltype); + + piov[0].iov_len = sizeof(param); + piov[0].iov_base = param; + + /* send the parameters to the server */ + ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET, GFP_NOFS, + 0, &sent); + if (ret < 0) + goto abort; + + /* wait for the reply to completely arrive */ + bp = rxrpc_call_alloc_scratch(call, 384); + + ret = rxrpc_call_read_data(call, bp, 384, + RXRPC_CALL_READ_BLOCK | + RXRPC_CALL_READ_ALL); + if (ret < 0) { + if (ret == -ECONNABORTED) { + ret = call->app_errno; + goto out_unwait; + } + goto abort; + } + + /* unmarshall the reply */ + for (loop = 0; loop < 64; loop++) + entry->name[loop] = ntohl(*bp++); + bp++; /* final NUL */ + + bp++; /* type */ + entry->nservers = ntohl(*bp++); + + for (loop = 0; loop < 8; loop++) + entry->servers[loop].s_addr = *bp++; + + bp += 8; /* partition IDs */ + + for (loop = 0; loop < 8; loop++) { + tmp = ntohl(*bp++); + if (tmp & AFS_VLSF_RWVOL) + entry->srvtmask[loop] |= AFS_VOL_VTM_RW; + if (tmp & AFS_VLSF_ROVOL) + entry->srvtmask[loop] |= AFS_VOL_VTM_RO; + if (tmp & AFS_VLSF_BACKVOL) + entry->srvtmask[loop] |= AFS_VOL_VTM_BAK; + } + + entry->vid[0] = ntohl(*bp++); + entry->vid[1] = ntohl(*bp++); + entry->vid[2] = ntohl(*bp++); + + bp++; /* clone ID */ + + tmp = ntohl(*bp++); /* flags */ + if (tmp & AFS_VLF_RWEXISTS) + entry->vidmask |= AFS_VOL_VTM_RW; + if (tmp & AFS_VLF_ROEXISTS) + entry->vidmask |= AFS_VOL_VTM_RO; + if (tmp & AFS_VLF_BACKEXISTS) + entry->vidmask |= AFS_VOL_VTM_BAK; + + ret = -ENOMEDIUM; + if (!entry->vidmask) + goto abort; + +#if 0 /* TODO: remove */ + entry->nservers = 3; + entry->servers[0].s_addr = htonl(0xac101249); + entry->servers[1].s_addr = htonl(0xac101243); + entry->servers[2].s_addr = htonl(0xac10125b /*0xac10125b*/); + + entry->srvtmask[0] = AFS_VOL_VTM_RO; + entry->srvtmask[1] = AFS_VOL_VTM_RO; + entry->srvtmask[2] = AFS_VOL_VTM_RO | AFS_VOL_VTM_RW; +#endif + + /* success */ + entry->rtime = get_seconds(); + ret = 0; + + out_unwait: + set_current_state(TASK_RUNNING); + remove_wait_queue(&call->waitq, &myself); + rxrpc_put_call(call); + out_put_conn: + rxrpc_put_connection(conn); + out: + _leave(" = %d", ret); + return ret; + + abort: + set_current_state(TASK_UNINTERRUPTIBLE); + rxrpc_call_abort(call, ret); + schedule(); + goto out_unwait; +} /* end afs_rxvl_get_entry_by_id() */ + +/*****************************************************************************/ +/* + * look up a volume location database entry by ID asynchronously + */ +int afs_rxvl_get_entry_by_id_async(struct afs_async_op *op, + afs_volid_t volid, + afs_voltype_t voltype) +{ + struct rxrpc_connection *conn; + struct rxrpc_call *call; + struct kvec piov[1]; + size_t sent; + int ret; + __be32 param[3]; + + _enter(",%x,%d,", volid, voltype); + + /* get hold of the vlserver connection */ + ret = afs_server_get_vlconn(op->server, &conn); + if (ret < 0) { + _leave(" = %d", ret); + return ret; + } + + /* create a call through that connection */ + ret = rxrpc_create_call(conn, + afs_rxvl_get_entry_by_id_attn, + afs_rxvl_get_entry_by_id_error, + afs_rxvl_aemap, + &op->call); + rxrpc_put_connection(conn); + + if (ret < 0) { + printk("kAFS: Unable to create call: %d\n", ret); + _leave(" = %d", ret); + return ret; + } + + op->call->app_opcode = VLGETENTRYBYID; + op->call->app_user = op; + + call = op->call; + rxrpc_get_call(call); + + /* send event notifications from the call to kafsasyncd */ + afs_kafsasyncd_begin_op(op); + + /* marshall the parameters */ + param[0] = htonl(VLGETENTRYBYID); + param[1] = htonl(volid); + param[2] = htonl(voltype); + + piov[0].iov_len = sizeof(param); + piov[0].iov_base = param; + + /* allocate result read buffer in scratch space */ + call->app_scr_ptr = rxrpc_call_alloc_scratch(op->call, 384); + + /* send the parameters to the server */ + ret = rxrpc_call_write_data(call, 1, piov, RXRPC_LAST_PACKET, GFP_NOFS, + 0, &sent); + if (ret < 0) { + rxrpc_call_abort(call, ret); /* handle from kafsasyncd */ + ret = 0; + goto out; + } + + /* wait for the reply to completely arrive */ + ret = rxrpc_call_read_data(call, call->app_scr_ptr, 384, 0); + switch (ret) { + case 0: + case -EAGAIN: + case -ECONNABORTED: + ret = 0; + break; /* all handled by kafsasyncd */ + + default: + rxrpc_call_abort(call, ret); /* make kafsasyncd handle it */ + ret = 0; + break; + } + + out: + rxrpc_put_call(call); + _leave(" = %d", ret); + return ret; + +} /* end afs_rxvl_get_entry_by_id_async() */ + +/*****************************************************************************/ +/* + * attend to the asynchronous get VLDB entry by ID + */ +int afs_rxvl_get_entry_by_id_async2(struct afs_async_op *op, + struct afs_cache_vlocation *entry) +{ + __be32 *bp; + __u32 tmp; + int loop, ret; + + _enter("{op=%p cst=%u}", op, op->call->app_call_state); + + memset(entry, 0, sizeof(*entry)); + + if (op->call->app_call_state == RXRPC_CSTATE_COMPLETE) { + /* operation finished */ + afs_kafsasyncd_terminate_op(op); + + bp = op->call->app_scr_ptr; + + /* unmarshall the reply */ + for (loop = 0; loop < 64; loop++) + entry->name[loop] = ntohl(*bp++); + bp++; /* final NUL */ + + bp++; /* type */ + entry->nservers = ntohl(*bp++); + + for (loop = 0; loop < 8; loop++) + entry->servers[loop].s_addr = *bp++; + + bp += 8; /* partition IDs */ + + for (loop = 0; loop < 8; loop++) { + tmp = ntohl(*bp++); + if (tmp & AFS_VLSF_RWVOL) + entry->srvtmask[loop] |= AFS_VOL_VTM_RW; + if (tmp & AFS_VLSF_ROVOL) + entry->srvtmask[loop] |= AFS_VOL_VTM_RO; + if (tmp & AFS_VLSF_BACKVOL) + entry->srvtmask[loop] |= AFS_VOL_VTM_BAK; + } + + entry->vid[0] = ntohl(*bp++); + entry->vid[1] = ntohl(*bp++); + entry->vid[2] = ntohl(*bp++); + + bp++; /* clone ID */ + + tmp = ntohl(*bp++); /* flags */ + if (tmp & AFS_VLF_RWEXISTS) + entry->vidmask |= AFS_VOL_VTM_RW; + if (tmp & AFS_VLF_ROEXISTS) + entry->vidmask |= AFS_VOL_VTM_RO; + if (tmp & AFS_VLF_BACKEXISTS) + entry->vidmask |= AFS_VOL_VTM_BAK; + + ret = -ENOMEDIUM; + if (!entry->vidmask) { + rxrpc_call_abort(op->call, ret); + goto done; + } + +#if 0 /* TODO: remove */ + entry->nservers = 3; + entry->servers[0].s_addr = htonl(0xac101249); + entry->servers[1].s_addr = htonl(0xac101243); + entry->servers[2].s_addr = htonl(0xac10125b /*0xac10125b*/); + + entry->srvtmask[0] = AFS_VOL_VTM_RO; + entry->srvtmask[1] = AFS_VOL_VTM_RO; + entry->srvtmask[2] = AFS_VOL_VTM_RO | AFS_VOL_VTM_RW; +#endif + + /* success */ + entry->rtime = get_seconds(); + ret = 0; + goto done; + } + + if (op->call->app_call_state == RXRPC_CSTATE_ERROR) { + /* operation error */ + ret = op->call->app_errno; + goto done; + } + + _leave(" = -EAGAIN"); + return -EAGAIN; + + done: + rxrpc_put_call(op->call); + op->call = NULL; + _leave(" = %d", ret); + return ret; +} /* end afs_rxvl_get_entry_by_id_async2() */ + +/*****************************************************************************/ +/* + * handle attention events on an async get-entry-by-ID op + * - called from krxiod + */ +static void afs_rxvl_get_entry_by_id_attn(struct rxrpc_call *call) +{ + struct afs_async_op *op = call->app_user; + + _enter("{op=%p cst=%u}", op, call->app_call_state); + + switch (call->app_call_state) { + case RXRPC_CSTATE_COMPLETE: + afs_kafsasyncd_attend_op(op); + break; + case RXRPC_CSTATE_CLNT_RCV_REPLY: + if (call->app_async_read) + break; + case RXRPC_CSTATE_CLNT_GOT_REPLY: + if (call->app_read_count == 0) + break; + printk("kAFS: Reply bigger than expected" + " {cst=%u asyn=%d mark=%Zu rdy=%Zu pr=%u%s}", + call->app_call_state, + call->app_async_read, + call->app_mark, + call->app_ready_qty, + call->pkt_rcv_count, + call->app_last_rcv ? " last" : ""); + + rxrpc_call_abort(call, -EBADMSG); + break; + default: + BUG(); + } + + _leave(""); + +} /* end afs_rxvl_get_entry_by_id_attn() */ + +/*****************************************************************************/ +/* + * handle error events on an async get-entry-by-ID op + * - called from krxiod + */ +static void afs_rxvl_get_entry_by_id_error(struct rxrpc_call *call) +{ + struct afs_async_op *op = call->app_user; + + _enter("{op=%p cst=%u}", op, call->app_call_state); + + afs_kafsasyncd_attend_op(op); + + _leave(""); + +} /* end afs_rxvl_get_entry_by_id_error() */ |