lustre/osc/osc_request.c

   1 /*
   2  * Copryright (C) 2001 Cluster File Systems, Inc.
   3  *
   4  *  This code is issued under the GNU General Public License.
   5  *  See the file COPYING in this distribution
   6  *
   7  *  Author Peter Braam <braam@clusterfs.com>
   8  *
   9  *  This server is single threaded at present (but can easily be multi
  10  *  threaded). For testing and management it is treated as an
  11  *  obd_device, although it does not export a full OBD method table
  12  *  (the requests are coming in over the wire, so object target
  13  *  modules do not have a full method table.)
  14  *
  15  */
  16
  17 #define EXPORT_SYMTAB
  18
  19 #include <linux/config.h>
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/mm.h>
  23 #include <linux/string.h>
  24 #include <linux/stat.h>
  25 #include <linux/errno.h>
  26 #include <linux/locks.h>
  27 #include <linux/unistd.h>
  28
  29 #include <asm/system.h>
  30 #include <asm/uaccess.h>
  31
  32 #include <linux/fs.h>
  33 #include <linux/stat.h>
  34 #include <asm/uaccess.h>
  35 #include <linux/vmalloc.h>
  36 #include <asm/segment.h>
  37 #include <linux/miscdevice.h>
  38
  39 #include <linux/obd_support.h>
  40 #include <linux/obd_class.h>
  41 #include <linux/lustre_lib.h>
  42 #include <linux/lustre_idl.h>
  43
  44 extern int ost_queue_req(struct obd_device *, struct ptlrpc_request *);
  45
  46 /* FIXME: this belongs in some sort of service struct */
  47 static int osc_xid = 1;
  48
  49 struct ptlrpc_request *ost_prep_req(int opcode, int buflen1, char *buf1,
  50                                  int buflen2, char *buf2)
  51 {
  52         struct ptlrpc_request *request;
  53         int rc;
  54         ENTRY;
  55
  56         request = (struct ptlrpc_request *)kmalloc(sizeof(*request), GFP_KERNEL);
  57         if (!request) {
  58                 printk("osc_prep_req: request allocation out of memory\n");
  59                 return NULL;
  60         }
  61
  62         memset(request, 0, sizeof(*request));
  63         request->rq_xid = osc_xid++;
  64
  65         rc = ost_pack_req(buf1, buflen1,  buf2, buflen2,
  66                           &request->rq_reqhdr, &request->rq_req.ost,
  67                           &request->rq_reqlen, &request->rq_reqbuf);
  68         if (rc) {
  69                 printk("llight request: cannot pack request %d\n", rc);
  70                 return NULL;
  71         }
  72         request->rq_reqhdr->opc = opcode;
  73
  74         EXIT;
  75         return request;
  76 }
  77
  78 /* XXX: unify with mdc_queue_wait */
  79 extern int osc_queue_wait(struct obd_conn *conn, struct ptlrpc_request *req)
  80 {
  81         struct obd_device *client = conn->oc_dev;
  82         struct lustre_peer *peer = &conn->oc_dev->u.osc.osc_peer;
  83         int rc;
  84
  85         ENTRY;
  86
  87         /* set the connection id */
  88         req->rq_req.ost->connid = conn->oc_id;
  89
  90         /* XXX fix the race here (wait_for_event?)*/
  91         if (peer == NULL) {
  92                 /* Local delivery */
  93                 CDEBUG(D_INODE, "\n");
  94                 rc = ost_queue_req(client, req);
  95         } else {
  96                 /* Remote delivery via portals. */
  97                 req->rq_req_portal = OST_REQUEST_PORTAL;
  98                 req->rq_reply_portal = OST_REPLY_PORTAL;
  99                 rc = ptl_send_rpc(req, peer);
 100         }
 101         if (rc) {
 102                 printk(__FUNCTION__ ": error %d, opcode %d\n", rc,
 103                        req->rq_reqhdr->opc);
 104                 return -rc;
 105         }
 106
 107         CDEBUG(D_INODE, "tgt at %p, conn id %d, opcode %d request at: %p\n",
 108                &conn->oc_dev->u.osc.osc_tgt->u.ost,
 109                conn->oc_id, req->rq_reqhdr->opc, req);
 110
 111         /* wait for the reply */
 112         init_waitqueue_head(&req->rq_wait_for_rep);
 113         CDEBUG(D_INODE, "-- sleeping\n");
 114         interruptible_sleep_on(&req->rq_wait_for_rep);
 115         CDEBUG(D_INODE, "-- done\n");
 116
 117         rc = ost_unpack_rep(req->rq_repbuf, req->rq_replen, &req->rq_rephdr,
 118                             &req->rq_rep.ost);
 119         if (rc) {
 120                 printk(__FUNCTION__ ": mds_unpack_rep failed: %d\n", rc);
 121                 return rc;
 122         }
 123
 124         if ( req->rq_rephdr->status == 0 )
 125                 CDEBUG(D_INODE, "buf %p len %d status %d\n",
 126                        req->rq_repbuf, req->rq_replen,
 127                        req->rq_rephdr->status);
 128
 129         EXIT;
 130         return 0;
 131 }
 132
 133 static void osc_free_req(struct ptlrpc_request *request)
 134 {
 135         kfree(request);
 136 }
 137
 138 static int osc_connect(struct obd_conn *conn)
 139 {
 140         struct ptlrpc_request *request;
 141         int rc;
 142         ENTRY;
 143
 144         request = ost_prep_req(OST_CONNECT, 0, NULL, 0, NULL);
 145         if (!request) {
 146                 printk(__FUNCTION__ ": cannot pack req!\n");
 147                 return -ENOMEM;
 148         }
 149
 150         request->rq_replen =
 151                 sizeof(struct ptlrep_hdr) + sizeof(struct ost_rep);
 152
 153         rc = osc_queue_wait(conn, request);
 154         if (rc) {
 155                 EXIT;
 156                 goto out;
 157         }
 158
 159         CDEBUG(D_INODE, "received connid %d\n", request->rq_rep.ost->connid);
 160
 161         conn->oc_id = request->rq_rep.ost->connid;
 162  out:
 163         osc_free_req(request);
 164         EXIT;
 165         return rc;
 166 }
 167
 168 static int osc_disconnect(struct obd_conn *conn)
 169 {
 170         struct ptlrpc_request *request;
 171         int rc;
 172         ENTRY;
 173
 174         request = ost_prep_req(OST_DISCONNECT, 0, NULL, 0, NULL);
 175         if (!request) {
 176                 printk(__FUNCTION__ ": cannot pack req!\n");
 177                 return -ENOMEM;
 178         }
 179
 180         request->rq_replen =
 181                 sizeof(struct ptlrep_hdr) + sizeof(struct ost_rep);
 182
 183         rc = osc_queue_wait(conn, request);
 184         if (rc) {
 185                 EXIT;
 186                 goto out;
 187         }
 188  out:
 189         osc_free_req(request);
 190         EXIT;
 191         return rc;
 192 }
 193
 194
 195 static int osc_getattr(struct obd_conn *conn, struct obdo *oa)
 196 {
 197         struct ptlrpc_request *request;
 198         int rc;
 199
 200         request = ost_prep_req(OST_GETATTR, 0, NULL, 0, NULL);
 201         if (!request) {
 202                 printk(__FUNCTION__ ": cannot pack req!\n");
 203                 return -ENOMEM;
 204         }
 205
 206         memcpy(&request->rq_req.ost->oa, oa, sizeof(*oa));
 207         request->rq_req.ost->oa.o_valid = ~0;
 208         request->rq_replen =
 209                 sizeof(struct ptlrep_hdr) + sizeof(struct ost_rep);
 210
 211         rc = osc_queue_wait(conn, request);
 212         if (rc) {
 213                 EXIT;
 214                 goto out;
 215         }
 216
 217         CDEBUG(D_INODE, "mode: %o\n", request->rq_rep.ost->oa.o_mode);
 218         if (oa) {
 219                 memcpy(oa, &request->rq_rep.ost->oa, sizeof(*oa));
 220         }
 221
 222  out:
 223         osc_free_req(request);
 224         return 0;
 225 }
 226
 227 static int osc_setattr(struct obd_conn *conn, struct obdo *oa)
 228 {
 229         struct ptlrpc_request *request;
 230         int rc;
 231
 232         request = ost_prep_req(OST_SETATTR, 0, NULL, 0, NULL);
 233         if (!request) {
 234                 printk(__FUNCTION__ ": cannot pack req!\n");
 235                 return -ENOMEM;
 236         }
 237
 238         memcpy(&request->rq_req.ost->oa, oa, sizeof(*oa));
 239         request->rq_replen =
 240                 sizeof(struct ptlrep_hdr) + sizeof(struct ost_rep);
 241
 242         rc = osc_queue_wait(conn, request);
 243         if (rc) {
 244                 EXIT;
 245                 goto out;
 246         }
 247
 248  out:
 249         osc_free_req(request);
 250         return 0;
 251 }
 252
 253 static int osc_create(struct obd_conn *conn, struct obdo *oa)
 254 {
 255         struct ptlrpc_request *request;
 256         int rc;
 257
 258         if (!oa) {
 259                 printk(__FUNCTION__ ": oa NULL\n");
 260         }
 261         request = ost_prep_req(OST_CREATE, 0, NULL, 0, NULL);
 262         if (!request) {
 263                 printk("osc_connect: cannot pack req!\n");
 264                 return -ENOMEM;
 265         }
 266
 267         memcpy(&request->rq_req.ost->oa, oa, sizeof(*oa));
 268         request->rq_req.ost->oa.o_valid = ~0;
 269         request->rq_replen =
 270                 sizeof(struct ptlrep_hdr) + sizeof(struct ost_rep);
 271
 272         rc = osc_queue_wait(conn, request);
 273         if (rc) {
 274                 EXIT;
 275                 goto out;
 276         }
 277         memcpy(oa, &request->rq_rep.ost->oa, sizeof(*oa));
 278
 279  out:
 280         osc_free_req(request);
 281         return 0;
 282 }
 283
 284 static int osc_destroy(struct obd_conn *conn, struct obdo *oa)
 285 {
 286         struct ptlrpc_request *request;
 287         int rc;
 288
 289         if (!oa) {
 290                 printk(__FUNCTION__ ": oa NULL\n");
 291         }
 292         request = ost_prep_req(OST_DESTROY, 0, NULL, 0, NULL);
 293         if (!request) {
 294                 printk("osc_connect: cannot pack req!\n");
 295                 return -ENOMEM;
 296         }
 297
 298         memcpy(&request->rq_req.ost->oa, oa, sizeof(*oa));
 299         request->rq_req.ost->oa.o_valid = ~0;
 300         request->rq_replen =
 301                 sizeof(struct ptlrep_hdr) + sizeof(struct ost_rep);
 302
 303         rc = osc_queue_wait(conn, request);
 304         if (rc) {
 305                 EXIT;
 306                 goto out;
 307         }
 308         memcpy(oa, &request->rq_rep.ost->oa, sizeof(*oa));
 309
 310  out:
 311         osc_free_req(request);
 312         return 0;
 313 }
 314
 315
 316 /* mount the file system (secretly) */
 317 static int osc_setup(struct obd_device *obddev, obd_count len,
 318                         void *buf)
 319
 320 {
 321         struct obd_ioctl_data* data = buf;
 322         struct osc_obd *osc = &obddev->u.osc;
 323         ENTRY;
 324
 325         if (data->ioc_dev >= 0 && data->ioc_dev < MAX_OBD_DEVICES) {
 326                 /* This is a local connection */
 327                 osc->osc_tgt = &obd_dev[data->ioc_dev];
 328
 329                 printk("OSC: tgt %d ost at %p\n", data->ioc_dev,
 330                        &osc->osc_tgt->u.ost);
 331                 if ( ! (osc->osc_tgt->obd_flags & OBD_ATTACHED) ||
 332                      ! (osc->osc_tgt->obd_flags & OBD_SET_UP) ){
 333                         printk("device not attached or not set up (%d)\n",
 334                                data->ioc_dev);
 335                         EXIT;
 336                         return -EINVAL;
 337                 }
 338         } else {
 339                 int err;
 340                 /* This is a remote connection using Portals */
 341
 342                 /* XXX: this should become something like ioc_inlbuf1 */
 343                 err = kportal_uuid_to_peer("ost", &osc->osc_peer);
 344                 if (err != 0) {
 345                         printk("Cannot find 'ost' peer.\n");
 346                         EXIT;
 347                         return -EINVAL;
 348                 }
 349         }
 350
 351         MOD_INC_USE_COUNT;
 352         EXIT;
 353         return 0;
 354 }
 355
 356 void osc_sendpage(struct niobuf *dst, struct niobuf *src)
 357 {
 358         memcpy((char *)(unsigned long)dst->addr,
 359                (char *)(unsigned long)src->addr,
 360                src->len);
 361         return;
 362 }
 363
 364
 365 int osc_brw(int rw, struct obd_conn *conn, obd_count num_oa,
 366               struct obdo **oa, obd_count *oa_bufs, struct page **buf,
 367               obd_size *count, obd_off *offset, obd_flag *flags)
 368 {
 369         struct ptlrpc_request *request;
 370         int rc;
 371         struct obd_ioobj ioo;
 372         struct niobuf src;
 373         int size1, size2 = 0;
 374         void *ptr1, *ptr2;
 375         int i, j, n;
 376
 377         size1 = num_oa * sizeof(ioo);
 378         for (i = 0; i < num_oa; i++) {
 379                 size2 += oa_bufs[i] * sizeof(src);
 380         }
 381
 382         request = ost_prep_req(OST_BRW, size1, NULL, size2, NULL);
 383         if (!request) {
 384                 printk("osc_connect: cannot pack req!\n");
 385                 return -ENOMEM;
 386         }
 387
 388         n = 0;
 389         request->rq_req.ost->cmd = rw;
 390         ptr1 = ost_req_buf1(request->rq_req.ost);
 391         ptr2 = ost_req_buf2(request->rq_req.ost);
 392         for (i=0; i < num_oa; i++) {
 393                 ost_pack_ioo(&ptr1, oa[i], oa_bufs[i]);
 394                 for (j = 0 ; j < oa_bufs[i] ; j++) {
 395                         ost_pack_niobuf(&ptr2, kmap(buf[n]), offset[n],
 396                                         count[n], flags[n]);
 397                         n++;
 398                 }
 399         }
 400
 401         request->rq_replen =
 402                 sizeof(struct ptlrep_hdr) + sizeof(struct ost_rep) + size2;
 403
 404         rc = osc_queue_wait(conn, request);
 405         if (rc) {
 406                 EXIT;
 407                 goto out;
 408         }
 409
 410 #if 0
 411         ptr2 = ost_rep_buf2(request->rq_rep.ost);
 412         if (request->rq_rep.ost->buflen2 != n * sizeof(struct niobuf)) {
 413                 printk(__FUNCTION__ ": buffer length wrong\n");
 414                 goto out;
 415         }
 416
 417         if (rw == OBD_BRW_READ)
 418                 goto out;
 419
 420         for (i=0; i < num_oa; i++) {
 421                 for (j = 0 ; j < oa_bufs[i] ; j++) {
 422                         struct niobuf *dst;
 423                         src.addr = (__u64)(unsigned long)buf[n];
 424                         src.len = count[n];
 425                         ost_unpack_niobuf(&ptr2, &dst);
 426                         osc_sendpage(dst, &src);
 427                         n++;
 428                 }
 429         }
 430 #endif
 431
 432  out:
 433         if (request->rq_rephdr)
 434                 kfree(request->rq_rephdr);
 435         n = 0;
 436         for (i=0; i < num_oa; i++) {
 437                 for (j = 0 ; j < oa_bufs[i] ; j++) {
 438                         kunmap(buf[n]);
 439                         n++;
 440                 }
 441         }
 442
 443         osc_free_req(request);
 444         return 0;
 445 }
 446
 447 static int osc_cleanup(struct obd_device * obddev)
 448 {
 449         MOD_DEC_USE_COUNT;
 450         return 0;
 451 }
 452
 453 struct obd_ops osc_obd_ops = {
 454         o_setup:   osc_setup,
 455         o_cleanup: osc_cleanup,
 456         o_create: osc_create,
 457         o_destroy: osc_destroy,
 458         o_getattr: osc_getattr,
 459         o_setattr: osc_setattr,
 460         o_connect: osc_connect,
 461         o_disconnect: osc_disconnect,
 462         o_brw: osc_brw
 463 };
 464
 465 static int __init osc_init(void)
 466 {
 467         obd_register_type(&osc_obd_ops, LUSTRE_OSC_NAME);
 468         return 0;
 469 }
 470
 471 static void __exit osc_exit(void)
 472 {
 473         obd_unregister_type(LUSTRE_OSC_NAME);
 474 }
 475
 476 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 477 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC) v1.0");
 478 MODULE_LICENSE("GPL");
 479
 480 module_init(osc_init);
 481 module_exit(osc_exit);
 482