kernel/fs/nfs/filelayout/filelayout.c

   1 /*
   2  *  Module for the pnfs nfs4 file layout driver.
   3  *  Defines all I/O and Policy interface operations, plus code
   4  *  to register itself with the pNFS client.
   5  *
   6  *  Copyright (c) 2002
   7  *  The Regents of the University of Michigan
   8  *  All Rights Reserved
   9  *
  10  *  Dean Hildebrand <dhildebz@umich.edu>
  11  *
  12  *  Permission is granted to use, copy, create derivative works, and
  13  *  redistribute this software and such derivative works for any purpose,
  14  *  so long as the name of the University of Michigan is not used in
  15  *  any advertising or publicity pertaining to the use or distribution
  16  *  of this software without specific, written prior authorization. If
  17  *  the above copyright notice or any other identification of the
  18  *  University of Michigan is included in any copy of any portion of
  19  *  this software, then the disclaimer below must also be included.
  20  *
  21  *  This software is provided as is, without representation or warranty
  22  *  of any kind either express or implied, including without limitation
  23  *  the implied warranties of merchantability, fitness for a particular
  24  *  purpose, or noninfringement.  The Regents of the University of
  25  *  Michigan shall not be liable for any damages, including special,
  26  *  indirect, incidental, or consequential damages, with respect to any
  27  *  claim arising out of or in connection with the use of the software,
  28  *  even if it has been or is hereafter advised of the possibility of
  29  *  such damages.
  30  */
  31
  32 #include <linux/nfs_fs.h>
  33 #include <linux/nfs_page.h>
  34 #include <linux/module.h>
  35
  36 #include <linux/sunrpc/metrics.h>
  37
  38 #include "../nfs4session.h"
  39 #include "../internal.h"
  40 #include "../delegation.h"
  41 #include "filelayout.h"
  42 #include "../nfs4trace.h"
  43
  44 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
  45
  46 MODULE_LICENSE("GPL");
  47 MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
  48 MODULE_DESCRIPTION("The NFSv4 file layout driver");
  49
  50 #define FILELAYOUT_POLL_RETRY_MAX     (15*HZ)
  51
  52 static loff_t
  53 filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
  54                             loff_t offset)
  55 {
  56         u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
  57         u64 stripe_no;
  58         u32 rem;
  59
  60         offset -= flseg->pattern_offset;
  61         stripe_no = div_u64(offset, stripe_width);
  62         div_u64_rem(offset, flseg->stripe_unit, &rem);
  63
  64         return stripe_no * flseg->stripe_unit + rem;
  65 }
  66
  67 /* This function is used by the layout driver to calculate the
  68  * offset of the file on the dserver based on whether the
  69  * layout type is STRIPE_DENSE or STRIPE_SPARSE
  70  */
  71 static loff_t
  72 filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
  73 {
  74         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
  75
  76         switch (flseg->stripe_type) {
  77         case STRIPE_SPARSE:
  78                 return offset;
  79
  80         case STRIPE_DENSE:
  81                 return filelayout_get_dense_offset(flseg, offset);
  82         }
  83
  84         BUG();
  85 }
  86
  87 static void filelayout_reset_write(struct nfs_pgio_header *hdr)
  88 {
  89         struct rpc_task *task = &hdr->task;
  90
  91         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
  92                 dprintk("%s Reset task %5u for i/o through MDS "
  93                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
  94                         hdr->task.tk_pid,
  95                         hdr->inode->i_sb->s_id,
  96                         (unsigned long long)NFS_FILEID(hdr->inode),
  97                         hdr->args.count,
  98                         (unsigned long long)hdr->args.offset);
  99
 100                 task->tk_status = pnfs_write_done_resend_to_mds(hdr);
 101         }
 102 }
 103
 104 static void filelayout_reset_read(struct nfs_pgio_header *hdr)
 105 {
 106         struct rpc_task *task = &hdr->task;
 107
 108         if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
 109                 dprintk("%s Reset task %5u for i/o through MDS "
 110                         "(req %s/%llu, %u bytes @ offset %llu)\n", __func__,
 111                         hdr->task.tk_pid,
 112                         hdr->inode->i_sb->s_id,
 113                         (unsigned long long)NFS_FILEID(hdr->inode),
 114                         hdr->args.count,
 115                         (unsigned long long)hdr->args.offset);
 116
 117                 task->tk_status = pnfs_read_done_resend_to_mds(hdr);
 118         }
 119 }
 120
 121 static int filelayout_async_handle_error(struct rpc_task *task,
 122                                          struct nfs4_state *state,
 123                                          struct nfs_client *clp,
 124                                          struct pnfs_layout_segment *lseg)
 125 {
 126         struct pnfs_layout_hdr *lo = lseg->pls_layout;
 127         struct inode *inode = lo->plh_inode;
 128         struct nfs_server *mds_server = NFS_SERVER(inode);
 129         struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
 130         struct nfs_client *mds_client = mds_server->nfs_client;
 131         struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
 132
 133         if (task->tk_status >= 0)
 134                 return 0;
 135
 136         switch (task->tk_status) {
 137         /* MDS state errors */
 138         case -NFS4ERR_DELEG_REVOKED:
 139         case -NFS4ERR_ADMIN_REVOKED:
 140         case -NFS4ERR_BAD_STATEID:
 141         case -NFS4ERR_OPENMODE:
 142                 if (state == NULL)
 143                         break;
 144                 if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
 145                         goto out_bad_stateid;
 146                 goto wait_on_recovery;
 147         case -NFS4ERR_EXPIRED:
 148                 if (state != NULL) {
 149                         if (nfs4_schedule_stateid_recovery(mds_server, state) < 0)
 150                                 goto out_bad_stateid;
 151                 }
 152                 nfs4_schedule_lease_recovery(mds_client);
 153                 goto wait_on_recovery;
 154         /* DS session errors */
 155         case -NFS4ERR_BADSESSION:
 156         case -NFS4ERR_BADSLOT:
 157         case -NFS4ERR_BAD_HIGH_SLOT:
 158         case -NFS4ERR_DEADSESSION:
 159         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 160         case -NFS4ERR_SEQ_FALSE_RETRY:
 161         case -NFS4ERR_SEQ_MISORDERED:
 162                 dprintk("%s ERROR %d, Reset session. Exchangeid "
 163                         "flags 0x%x\n", __func__, task->tk_status,
 164                         clp->cl_exchange_flags);
 165                 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
 166                 break;
 167         case -NFS4ERR_DELAY:
 168         case -NFS4ERR_GRACE:
 169                 rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
 170                 break;
 171         case -NFS4ERR_RETRY_UNCACHED_REP:
 172                 break;
 173         /* Invalidate Layout errors */
 174         case -NFS4ERR_PNFS_NO_LAYOUT:
 175         case -ESTALE:           /* mapped NFS4ERR_STALE */
 176         case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
 177         case -EISDIR:           /* mapped NFS4ERR_ISDIR */
 178         case -NFS4ERR_FHEXPIRED:
 179         case -NFS4ERR_WRONG_TYPE:
 180                 dprintk("%s Invalid layout error %d\n", __func__,
 181                         task->tk_status);
 182                 /*
 183                  * Destroy layout so new i/o will get a new layout.
 184                  * Layout will not be destroyed until all current lseg
 185                  * references are put. Mark layout as invalid to resend failed
 186                  * i/o and all i/o waiting on the slot table to the MDS until
 187                  * layout is destroyed and a new valid layout is obtained.
 188                  */
 189                 pnfs_destroy_layout(NFS_I(inode));
 190                 rpc_wake_up(&tbl->slot_tbl_waitq);
 191                 goto reset;
 192         /* RPC connection errors */
 193         case -ECONNREFUSED:
 194         case -EHOSTDOWN:
 195         case -EHOSTUNREACH:
 196         case -ENETUNREACH:
 197         case -EIO:
 198         case -ETIMEDOUT:
 199         case -EPIPE:
 200                 dprintk("%s DS connection error %d\n", __func__,
 201                         task->tk_status);
 202                 nfs4_mark_deviceid_unavailable(devid);
 203                 pnfs_error_mark_layout_for_return(inode, lseg);
 204                 rpc_wake_up(&tbl->slot_tbl_waitq);
 205                 /* fall through */
 206         default:
 207 reset:
 208                 dprintk("%s Retry through MDS. Error %d\n", __func__,
 209                         task->tk_status);
 210                 return -NFS4ERR_RESET_TO_MDS;
 211         }
 212 out:
 213         task->tk_status = 0;
 214         return -EAGAIN;
 215 out_bad_stateid:
 216         task->tk_status = -EIO;
 217         return 0;
 218 wait_on_recovery:
 219         rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
 220         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
 221                 rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
 222         goto out;
 223 }
 224
 225 /* NFS_PROTO call done callback routines */
 226
 227 static int filelayout_read_done_cb(struct rpc_task *task,
 228                                 struct nfs_pgio_header *hdr)
 229 {
 230         int err;
 231
 232         trace_nfs4_pnfs_read(hdr, task->tk_status);
 233         err = filelayout_async_handle_error(task, hdr->args.context->state,
 234                                             hdr->ds_clp, hdr->lseg);
 235
 236         switch (err) {
 237         case -NFS4ERR_RESET_TO_MDS:
 238                 filelayout_reset_read(hdr);
 239                 return task->tk_status;
 240         case -EAGAIN:
 241                 rpc_restart_call_prepare(task);
 242                 return -EAGAIN;
 243         }
 244
 245         return 0;
 246 }
 247
 248 /*
 249  * We reference the rpc_cred of the first WRITE that triggers the need for
 250  * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
 251  * rfc5661 is not clear about which credential should be used.
 252  */
 253 static void
 254 filelayout_set_layoutcommit(struct nfs_pgio_header *hdr)
 255 {
 256
 257         if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
 258             hdr->res.verf->committed != NFS_DATA_SYNC)
 259                 return;
 260
 261         pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
 262                         hdr->mds_offset + hdr->res.count);
 263         dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
 264                 (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
 265 }
 266
 267 bool
 268 filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node)
 269 {
 270         return filelayout_test_devid_invalid(node) ||
 271                 nfs4_test_deviceid_unavailable(node);
 272 }
 273
 274 static bool
 275 filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
 276 {
 277         struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg);
 278
 279         return filelayout_test_devid_unavailable(node);
 280 }
 281
 282 /*
 283  * Call ops for the async read/write cases
 284  * In the case of dense layouts, the offset needs to be reset to its
 285  * original value.
 286  */
 287 static void filelayout_read_prepare(struct rpc_task *task, void *data)
 288 {
 289         struct nfs_pgio_header *hdr = data;
 290
 291         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
 292                 rpc_exit(task, -EIO);
 293                 return;
 294         }
 295         if (filelayout_reset_to_mds(hdr->lseg)) {
 296                 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
 297                 filelayout_reset_read(hdr);
 298                 rpc_exit(task, 0);
 299                 return;
 300         }
 301         hdr->pgio_done_cb = filelayout_read_done_cb;
 302
 303         if (nfs41_setup_sequence(hdr->ds_clp->cl_session,
 304                         &hdr->args.seq_args,
 305                         &hdr->res.seq_res,
 306                         task))
 307                 return;
 308         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
 309                         hdr->args.lock_context, FMODE_READ) == -EIO)
 310                 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
 311 }
 312
 313 static void filelayout_read_call_done(struct rpc_task *task, void *data)
 314 {
 315         struct nfs_pgio_header *hdr = data;
 316
 317         dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
 318
 319         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
 320             task->tk_status == 0) {
 321                 nfs41_sequence_done(task, &hdr->res.seq_res);
 322                 return;
 323         }
 324
 325         /* Note this may cause RPC to be resent */
 326         hdr->mds_ops->rpc_call_done(task, data);
 327 }
 328
 329 static void filelayout_read_count_stats(struct rpc_task *task, void *data)
 330 {
 331         struct nfs_pgio_header *hdr = data;
 332
 333         rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics);
 334 }
 335
 336 static int filelayout_write_done_cb(struct rpc_task *task,
 337                                 struct nfs_pgio_header *hdr)
 338 {
 339         int err;
 340
 341         trace_nfs4_pnfs_write(hdr, task->tk_status);
 342         err = filelayout_async_handle_error(task, hdr->args.context->state,
 343                                             hdr->ds_clp, hdr->lseg);
 344
 345         switch (err) {
 346         case -NFS4ERR_RESET_TO_MDS:
 347                 filelayout_reset_write(hdr);
 348                 return task->tk_status;
 349         case -EAGAIN:
 350                 rpc_restart_call_prepare(task);
 351                 return -EAGAIN;
 352         }
 353
 354         filelayout_set_layoutcommit(hdr);
 355         return 0;
 356 }
 357
 358 static int filelayout_commit_done_cb(struct rpc_task *task,
 359                                      struct nfs_commit_data *data)
 360 {
 361         int err;
 362
 363         trace_nfs4_pnfs_commit_ds(data, task->tk_status);
 364         err = filelayout_async_handle_error(task, NULL, data->ds_clp,
 365                                             data->lseg);
 366
 367         switch (err) {
 368         case -NFS4ERR_RESET_TO_MDS:
 369                 pnfs_generic_prepare_to_resend_writes(data);
 370                 return -EAGAIN;
 371         case -EAGAIN:
 372                 rpc_restart_call_prepare(task);
 373                 return -EAGAIN;
 374         }
 375
 376         if (data->verf.committed == NFS_UNSTABLE)
 377                 pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb);
 378
 379         return 0;
 380 }
 381
 382 static void filelayout_write_prepare(struct rpc_task *task, void *data)
 383 {
 384         struct nfs_pgio_header *hdr = data;
 385
 386         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) {
 387                 rpc_exit(task, -EIO);
 388                 return;
 389         }
 390         if (filelayout_reset_to_mds(hdr->lseg)) {
 391                 dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
 392                 filelayout_reset_write(hdr);
 393                 rpc_exit(task, 0);
 394                 return;
 395         }
 396         if (nfs41_setup_sequence(hdr->ds_clp->cl_session,
 397                         &hdr->args.seq_args,
 398                         &hdr->res.seq_res,
 399                         task))
 400                 return;
 401         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
 402                         hdr->args.lock_context, FMODE_WRITE) == -EIO)
 403                 rpc_exit(task, -EIO); /* lost lock, terminate I/O */
 404 }
 405
 406 static void filelayout_write_call_done(struct rpc_task *task, void *data)
 407 {
 408         struct nfs_pgio_header *hdr = data;
 409
 410         if (test_bit(NFS_IOHDR_REDO, &hdr->flags) &&
 411             task->tk_status == 0) {
 412                 nfs41_sequence_done(task, &hdr->res.seq_res);
 413                 return;
 414         }
 415
 416         /* Note this may cause RPC to be resent */
 417         hdr->mds_ops->rpc_call_done(task, data);
 418 }
 419
 420 static void filelayout_write_count_stats(struct rpc_task *task, void *data)
 421 {
 422         struct nfs_pgio_header *hdr = data;
 423
 424         rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics);
 425 }
 426
 427 static void filelayout_commit_prepare(struct rpc_task *task, void *data)
 428 {
 429         struct nfs_commit_data *wdata = data;
 430
 431         nfs41_setup_sequence(wdata->ds_clp->cl_session,
 432                         &wdata->args.seq_args,
 433                         &wdata->res.seq_res,
 434                         task);
 435 }
 436
 437 static void filelayout_commit_count_stats(struct rpc_task *task, void *data)
 438 {
 439         struct nfs_commit_data *cdata = data;
 440
 441         rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics);
 442 }
 443
 444 static const struct rpc_call_ops filelayout_read_call_ops = {
 445         .rpc_call_prepare = filelayout_read_prepare,
 446         .rpc_call_done = filelayout_read_call_done,
 447         .rpc_count_stats = filelayout_read_count_stats,
 448         .rpc_release = pnfs_generic_rw_release,
 449 };
 450
 451 static const struct rpc_call_ops filelayout_write_call_ops = {
 452         .rpc_call_prepare = filelayout_write_prepare,
 453         .rpc_call_done = filelayout_write_call_done,
 454         .rpc_count_stats = filelayout_write_count_stats,
 455         .rpc_release = pnfs_generic_rw_release,
 456 };
 457
 458 static const struct rpc_call_ops filelayout_commit_call_ops = {
 459         .rpc_call_prepare = filelayout_commit_prepare,
 460         .rpc_call_done = pnfs_generic_write_commit_done,
 461         .rpc_count_stats = filelayout_commit_count_stats,
 462         .rpc_release = pnfs_generic_commit_release,
 463 };
 464
 465 static enum pnfs_try_status
 466 filelayout_read_pagelist(struct nfs_pgio_header *hdr)
 467 {
 468         struct pnfs_layout_segment *lseg = hdr->lseg;
 469         struct nfs4_pnfs_ds *ds;
 470         struct rpc_clnt *ds_clnt;
 471         loff_t offset = hdr->args.offset;
 472         u32 j, idx;
 473         struct nfs_fh *fh;
 474
 475         dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
 476                 __func__, hdr->inode->i_ino,
 477                 hdr->args.pgbase, (size_t)hdr->args.count, offset);
 478
 479         /* Retrieve the correct rpc_client for the byte range */
 480         j = nfs4_fl_calc_j_index(lseg, offset);
 481         idx = nfs4_fl_calc_ds_index(lseg, j);
 482         ds = nfs4_fl_prepare_ds(lseg, idx);
 483         if (!ds)
 484                 return PNFS_NOT_ATTEMPTED;
 485
 486         ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
 487         if (IS_ERR(ds_clnt))
 488                 return PNFS_NOT_ATTEMPTED;
 489
 490         dprintk("%s USE DS: %s cl_count %d\n", __func__,
 491                 ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
 492
 493         /* No multipath support. Use first DS */
 494         atomic_inc(&ds->ds_clp->cl_count);
 495         hdr->ds_clp = ds->ds_clp;
 496         hdr->ds_commit_idx = idx;
 497         fh = nfs4_fl_select_ds_fh(lseg, j);
 498         if (fh)
 499                 hdr->args.fh = fh;
 500
 501         hdr->args.offset = filelayout_get_dserver_offset(lseg, offset);
 502         hdr->mds_offset = offset;
 503
 504         /* Perform an asynchronous read to ds */
 505         nfs_initiate_pgio(ds_clnt, hdr, hdr->cred,
 506                           NFS_PROTO(hdr->inode), &filelayout_read_call_ops,
 507                           0, RPC_TASK_SOFTCONN);
 508         return PNFS_ATTEMPTED;
 509 }
 510
 511 /* Perform async writes. */
 512 static enum pnfs_try_status
 513 filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
 514 {
 515         struct pnfs_layout_segment *lseg = hdr->lseg;
 516         struct nfs4_pnfs_ds *ds;
 517         struct rpc_clnt *ds_clnt;
 518         loff_t offset = hdr->args.offset;
 519         u32 j, idx;
 520         struct nfs_fh *fh;
 521
 522         /* Retrieve the correct rpc_client for the byte range */
 523         j = nfs4_fl_calc_j_index(lseg, offset);
 524         idx = nfs4_fl_calc_ds_index(lseg, j);
 525         ds = nfs4_fl_prepare_ds(lseg, idx);
 526         if (!ds)
 527                 return PNFS_NOT_ATTEMPTED;
 528
 529         ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode);
 530         if (IS_ERR(ds_clnt))
 531                 return PNFS_NOT_ATTEMPTED;
 532
 533         dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
 534                 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count,
 535                 offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
 536
 537         hdr->pgio_done_cb = filelayout_write_done_cb;
 538         atomic_inc(&ds->ds_clp->cl_count);
 539         hdr->ds_clp = ds->ds_clp;
 540         hdr->ds_commit_idx = idx;
 541         fh = nfs4_fl_select_ds_fh(lseg, j);
 542         if (fh)
 543                 hdr->args.fh = fh;
 544         hdr->args.offset = filelayout_get_dserver_offset(lseg, offset);
 545
 546         /* Perform an asynchronous write */
 547         nfs_initiate_pgio(ds_clnt, hdr, hdr->cred,
 548                           NFS_PROTO(hdr->inode), &filelayout_write_call_ops,
 549                           sync, RPC_TASK_SOFTCONN);
 550         return PNFS_ATTEMPTED;
 551 }
 552
 553 /*
 554  * filelayout_check_layout()
 555  *
 556  * Make sure layout segment parameters are sane WRT the device.
 557  * At this point no generic layer initialization of the lseg has occurred,
 558  * and nothing has been added to the layout_hdr cache.
 559  *
 560  */
 561 static int
 562 filelayout_check_layout(struct pnfs_layout_hdr *lo,
 563                         struct nfs4_filelayout_segment *fl,
 564                         struct nfs4_layoutget_res *lgr,
 565                         struct nfs4_deviceid *id,
 566                         gfp_t gfp_flags)
 567 {
 568         struct nfs4_deviceid_node *d;
 569         struct nfs4_file_layout_dsaddr *dsaddr;
 570         int status = -EINVAL;
 571
 572         dprintk("--> %s\n", __func__);
 573
 574         /* FIXME: remove this check when layout segment support is added */
 575         if (lgr->range.offset != 0 ||
 576             lgr->range.length != NFS4_MAX_UINT64) {
 577                 dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
 578                         __func__);
 579                 goto out;
 580         }
 581
 582         if (fl->pattern_offset > lgr->range.offset) {
 583                 dprintk("%s pattern_offset %lld too large\n",
 584                                 __func__, fl->pattern_offset);
 585                 goto out;
 586         }
 587
 588         if (!fl->stripe_unit) {
 589                 dprintk("%s Invalid stripe unit (%u)\n",
 590                         __func__, fl->stripe_unit);
 591                 goto out;
 592         }
 593
 594         /* find and reference the deviceid */
 595         d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), id,
 596                         lo->plh_lc_cred, gfp_flags);
 597         if (d == NULL)
 598                 goto out;
 599
 600         dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
 601         /* Found deviceid is unavailable */
 602         if (filelayout_test_devid_unavailable(&dsaddr->id_node))
 603                 goto out_put;
 604
 605         fl->dsaddr = dsaddr;
 606
 607         if (fl->first_stripe_index >= dsaddr->stripe_count) {
 608                 dprintk("%s Bad first_stripe_index %u\n",
 609                                 __func__, fl->first_stripe_index);
 610                 goto out_put;
 611         }
 612
 613         if ((fl->stripe_type == STRIPE_SPARSE &&
 614             fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
 615             (fl->stripe_type == STRIPE_DENSE &&
 616             fl->num_fh != dsaddr->stripe_count)) {
 617                 dprintk("%s num_fh %u not valid for given packing\n",
 618                         __func__, fl->num_fh);
 619                 goto out_put;
 620         }
 621
 622         status = 0;
 623 out:
 624         dprintk("--> %s returns %d\n", __func__, status);
 625         return status;
 626 out_put:
 627         nfs4_fl_put_deviceid(dsaddr);
 628         goto out;
 629 }
 630
 631 static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
 632 {
 633         int i;
 634
 635         for (i = 0; i < fl->num_fh; i++) {
 636                 if (!fl->fh_array[i])
 637                         break;
 638                 kfree(fl->fh_array[i]);
 639         }
 640         kfree(fl->fh_array);
 641         fl->fh_array = NULL;
 642 }
 643
 644 static void
 645 _filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
 646 {
 647         filelayout_free_fh_array(fl);
 648         kfree(fl);
 649 }
 650
 651 static int
 652 filelayout_decode_layout(struct pnfs_layout_hdr *flo,
 653                          struct nfs4_filelayout_segment *fl,
 654                          struct nfs4_layoutget_res *lgr,
 655                          struct nfs4_deviceid *id,
 656                          gfp_t gfp_flags)
 657 {
 658         struct xdr_stream stream;
 659         struct xdr_buf buf;
 660         struct page *scratch;
 661         __be32 *p;
 662         uint32_t nfl_util;
 663         int i;
 664
 665         dprintk("%s: set_layout_map Begin\n", __func__);
 666
 667         scratch = alloc_page(gfp_flags);
 668         if (!scratch)
 669                 return -ENOMEM;
 670
 671         xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
 672         xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
 673
 674         /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
 675          * num_fh (4) */
 676         p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
 677         if (unlikely(!p))
 678                 goto out_err;
 679
 680         memcpy(id, p, sizeof(*id));
 681         p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
 682         nfs4_print_deviceid(id);
 683
 684         nfl_util = be32_to_cpup(p++);
 685         if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
 686                 fl->commit_through_mds = 1;
 687         if (nfl_util & NFL4_UFLG_DENSE)
 688                 fl->stripe_type = STRIPE_DENSE;
 689         else
 690                 fl->stripe_type = STRIPE_SPARSE;
 691         fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
 692
 693         fl->first_stripe_index = be32_to_cpup(p++);
 694         p = xdr_decode_hyper(p, &fl->pattern_offset);
 695         fl->num_fh = be32_to_cpup(p++);
 696
 697         dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
 698                 __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
 699                 fl->pattern_offset);
 700
 701         /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
 702          * Futher checking is done in filelayout_check_layout */
 703         if (fl->num_fh >
 704             max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
 705                 goto out_err;
 706
 707         if (fl->num_fh > 0) {
 708                 fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]),
 709                                        gfp_flags);
 710                 if (!fl->fh_array)
 711                         goto out_err;
 712         }
 713
 714         for (i = 0; i < fl->num_fh; i++) {
 715                 /* Do we want to use a mempool here? */
 716                 fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
 717                 if (!fl->fh_array[i])
 718                         goto out_err_free;
 719
 720                 p = xdr_inline_decode(&stream, 4);
 721                 if (unlikely(!p))
 722                         goto out_err_free;
 723                 fl->fh_array[i]->size = be32_to_cpup(p++);
 724                 if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
 725                         printk(KERN_ERR "NFS: Too big fh %d received %d\n",
 726                                i, fl->fh_array[i]->size);
 727                         goto out_err_free;
 728                 }
 729
 730                 p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
 731                 if (unlikely(!p))
 732                         goto out_err_free;
 733                 memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
 734                 dprintk("DEBUG: %s: fh len %d\n", __func__,
 735                         fl->fh_array[i]->size);
 736         }
 737
 738         __free_page(scratch);
 739         return 0;
 740
 741 out_err_free:
 742         filelayout_free_fh_array(fl);
 743 out_err:
 744         __free_page(scratch);
 745         return -EIO;
 746 }
 747
 748 static void
 749 filelayout_free_lseg(struct pnfs_layout_segment *lseg)
 750 {
 751         struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
 752
 753         dprintk("--> %s\n", __func__);
 754         nfs4_fl_put_deviceid(fl->dsaddr);
 755         /* This assumes a single RW lseg */
 756         if (lseg->pls_range.iomode == IOMODE_RW) {
 757                 struct nfs4_filelayout *flo;
 758
 759                 flo = FILELAYOUT_FROM_HDR(lseg->pls_layout);
 760                 flo->commit_info.nbuckets = 0;
 761                 kfree(flo->commit_info.buckets);
 762                 flo->commit_info.buckets = NULL;
 763         }
 764         _filelayout_free_lseg(fl);
 765 }
 766
 767 static int
 768 filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg,
 769                              struct nfs_commit_info *cinfo,
 770                              gfp_t gfp_flags)
 771 {
 772         struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
 773         struct pnfs_commit_bucket *buckets;
 774         int size, i;
 775
 776         if (fl->commit_through_mds)
 777                 return 0;
 778
 779         size = (fl->stripe_type == STRIPE_SPARSE) ?
 780                 fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
 781
 782         if (cinfo->ds->nbuckets >= size) {
 783                 /* This assumes there is only one IOMODE_RW lseg.  What
 784                  * we really want to do is have a layout_hdr level
 785                  * dictionary of <multipath_list4, fh> keys, each
 786                  * associated with a struct list_head, populated by calls
 787                  * to filelayout_write_pagelist().
 788                  * */
 789                 return 0;
 790         }
 791
 792         buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
 793                           gfp_flags);
 794         if (!buckets)
 795                 return -ENOMEM;
 796         for (i = 0; i < size; i++) {
 797                 INIT_LIST_HEAD(&buckets[i].written);
 798                 INIT_LIST_HEAD(&buckets[i].committing);
 799                 /* mark direct verifier as unset */
 800                 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
 801         }
 802
 803         spin_lock(cinfo->lock);
 804         if (cinfo->ds->nbuckets >= size)
 805                 goto out;
 806         for (i = 0; i < cinfo->ds->nbuckets; i++) {
 807                 list_splice(&cinfo->ds->buckets[i].written,
 808                             &buckets[i].written);
 809                 list_splice(&cinfo->ds->buckets[i].committing,
 810                             &buckets[i].committing);
 811                 buckets[i].direct_verf.committed =
 812                         cinfo->ds->buckets[i].direct_verf.committed;
 813                 buckets[i].wlseg = cinfo->ds->buckets[i].wlseg;
 814                 buckets[i].clseg = cinfo->ds->buckets[i].clseg;
 815         }
 816         swap(cinfo->ds->buckets, buckets);
 817         cinfo->ds->nbuckets = size;
 818 out:
 819         spin_unlock(cinfo->lock);
 820         kfree(buckets);
 821         return 0;
 822 }
 823
 824 static struct pnfs_layout_segment *
 825 filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
 826                       struct nfs4_layoutget_res *lgr,
 827                       gfp_t gfp_flags)
 828 {
 829         struct nfs4_filelayout_segment *fl;
 830         int rc;
 831         struct nfs4_deviceid id;
 832
 833         dprintk("--> %s\n", __func__);
 834         fl = kzalloc(sizeof(*fl), gfp_flags);
 835         if (!fl)
 836                 return NULL;
 837
 838         rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
 839         if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
 840                 _filelayout_free_lseg(fl);
 841                 return NULL;
 842         }
 843         return &fl->generic_hdr;
 844 }
 845
 846 /*
 847  * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
 848  *
 849  * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
 850  * of bytes (maximum @req->wb_bytes) that can be coalesced.
 851  */
 852 static size_t
 853 filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
 854                    struct nfs_page *req)
 855 {
 856         unsigned int size;
 857         u64 p_stripe, r_stripe;
 858         u32 stripe_offset;
 859         u64 segment_offset = pgio->pg_lseg->pls_range.offset;
 860         u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
 861
 862         /* calls nfs_generic_pg_test */
 863         size = pnfs_generic_pg_test(pgio, prev, req);
 864         if (!size)
 865                 return 0;
 866
 867         /* see if req and prev are in the same stripe */
 868         if (prev) {
 869                 p_stripe = (u64)req_offset(prev) - segment_offset;
 870                 r_stripe = (u64)req_offset(req) - segment_offset;
 871                 do_div(p_stripe, stripe_unit);
 872                 do_div(r_stripe, stripe_unit);
 873
 874                 if (p_stripe != r_stripe)
 875                         return 0;
 876         }
 877
 878         /* calculate remaining bytes in the current stripe */
 879         div_u64_rem((u64)req_offset(req) - segment_offset,
 880                         stripe_unit,
 881                         &stripe_offset);
 882         WARN_ON_ONCE(stripe_offset > stripe_unit);
 883         if (stripe_offset >= stripe_unit)
 884                 return 0;
 885         return min(stripe_unit - (unsigned int)stripe_offset, size);
 886 }
 887
 888 static void
 889 filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
 890                         struct nfs_page *req)
 891 {
 892         if (!pgio->pg_lseg)
 893                 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 894                                            req->wb_context,
 895                                            0,
 896                                            NFS4_MAX_UINT64,
 897                                            IOMODE_READ,
 898                                            GFP_KERNEL);
 899         /* If no lseg, fall back to read through mds */
 900         if (pgio->pg_lseg == NULL)
 901                 nfs_pageio_reset_read_mds(pgio);
 902 }
 903
 904 static void
 905 filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
 906                          struct nfs_page *req)
 907 {
 908         struct nfs_commit_info cinfo;
 909         int status;
 910
 911         if (!pgio->pg_lseg)
 912                 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 913                                            req->wb_context,
 914                                            0,
 915                                            NFS4_MAX_UINT64,
 916                                            IOMODE_RW,
 917                                            GFP_NOFS);
 918         /* If no lseg, fall back to write through mds */
 919         if (pgio->pg_lseg == NULL)
 920                 goto out_mds;
 921         nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
 922         status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
 923         if (status < 0) {
 924                 pnfs_put_lseg(pgio->pg_lseg);
 925                 pgio->pg_lseg = NULL;
 926                 goto out_mds;
 927         }
 928         return;
 929 out_mds:
 930         nfs_pageio_reset_write_mds(pgio);
 931 }
 932
 933 static const struct nfs_pageio_ops filelayout_pg_read_ops = {
 934         .pg_init = filelayout_pg_init_read,
 935         .pg_test = filelayout_pg_test,
 936         .pg_doio = pnfs_generic_pg_readpages,
 937         .pg_cleanup = pnfs_generic_pg_cleanup,
 938 };
 939
 940 static const struct nfs_pageio_ops filelayout_pg_write_ops = {
 941         .pg_init = filelayout_pg_init_write,
 942         .pg_test = filelayout_pg_test,
 943         .pg_doio = pnfs_generic_pg_writepages,
 944         .pg_cleanup = pnfs_generic_pg_cleanup,
 945 };
 946
 947 static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
 948 {
 949         if (fl->stripe_type == STRIPE_SPARSE)
 950                 return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
 951         else
 952                 return j;
 953 }
 954
 955 static void
 956 filelayout_mark_request_commit(struct nfs_page *req,
 957                                struct pnfs_layout_segment *lseg,
 958                                struct nfs_commit_info *cinfo,
 959                                u32 ds_commit_idx)
 960
 961 {
 962         struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
 963         u32 i, j;
 964
 965         if (fl->commit_through_mds) {
 966                 nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo);
 967         } else {
 968                 /* Note that we are calling nfs4_fl_calc_j_index on each page
 969                  * that ends up being committed to a data server.  An attractive
 970                  * alternative is to add a field to nfs_write_data and nfs_page
 971                  * to store the value calculated in filelayout_write_pagelist
 972                  * and just use that here.
 973                  */
 974                 j = nfs4_fl_calc_j_index(lseg, req_offset(req));
 975                 i = select_bucket_index(fl, j);
 976                 pnfs_layout_mark_request_commit(req, lseg, cinfo, i);
 977         }
 978 }
 979
 980 static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
 981 {
 982         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
 983
 984         if (flseg->stripe_type == STRIPE_SPARSE)
 985                 return i;
 986         else
 987                 return nfs4_fl_calc_ds_index(lseg, i);
 988 }
 989
 990 static struct nfs_fh *
 991 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
 992 {
 993         struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
 994
 995         if (flseg->stripe_type == STRIPE_SPARSE) {
 996                 if (flseg->num_fh == 1)
 997                         i = 0;
 998                 else if (flseg->num_fh == 0)
 999                         /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
1000                         return NULL;
1001         }
1002         return flseg->fh_array[i];
1003 }
1004
1005 static int filelayout_initiate_commit(struct nfs_commit_data *data, int how)
1006 {
1007         struct pnfs_layout_segment *lseg = data->lseg;
1008         struct nfs4_pnfs_ds *ds;
1009         struct rpc_clnt *ds_clnt;
1010         u32 idx;
1011         struct nfs_fh *fh;
1012
1013         idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1014         ds = nfs4_fl_prepare_ds(lseg, idx);
1015         if (!ds)
1016                 goto out_err;
1017
1018         ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode);
1019         if (IS_ERR(ds_clnt))
1020                 goto out_err;
1021
1022         dprintk("%s ino %lu, how %d cl_count %d\n", __func__,
1023                 data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count));
1024         data->commit_done_cb = filelayout_commit_done_cb;
1025         atomic_inc(&ds->ds_clp->cl_count);
1026         data->ds_clp = ds->ds_clp;
1027         fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1028         if (fh)
1029                 data->args.fh = fh;
1030         return nfs_initiate_commit(ds_clnt, data, NFS_PROTO(data->inode),
1031                                    &filelayout_commit_call_ops, how,
1032                                    RPC_TASK_SOFTCONN);
1033 out_err:
1034         pnfs_generic_prepare_to_resend_writes(data);
1035         pnfs_generic_commit_release(data);
1036         return -EAGAIN;
1037 }
1038
1039 /* filelayout_search_commit_reqs - Search lists in @cinfo for the head reqest
1040  *                                 for @page
1041  * @cinfo - commit info for current inode
1042  * @page - page to search for matching head request
1043  *
1044  * Returns a the head request if one is found, otherwise returns NULL.
1045  */
1046 static struct nfs_page *
1047 filelayout_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page)
1048 {
1049         struct nfs_page *freq, *t;
1050         struct pnfs_commit_bucket *b;
1051         int i;
1052
1053         /* Linearly search the commit lists for each bucket until a matching
1054          * request is found */
1055         for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
1056                 list_for_each_entry_safe(freq, t, &b->written, wb_list) {
1057                         if (freq->wb_page == page)
1058                                 return freq->wb_head;
1059                 }
1060                 list_for_each_entry_safe(freq, t, &b->committing, wb_list) {
1061                         if (freq->wb_page == page)
1062                                 return freq->wb_head;
1063                 }
1064         }
1065
1066         return NULL;
1067 }
1068
1069 static int
1070 filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1071                            int how, struct nfs_commit_info *cinfo)
1072 {
1073         return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo,
1074                                             filelayout_initiate_commit);
1075 }
1076
1077 static struct nfs4_deviceid_node *
1078 filelayout_alloc_deviceid_node(struct nfs_server *server,
1079                 struct pnfs_device *pdev, gfp_t gfp_flags)
1080 {
1081         struct nfs4_file_layout_dsaddr *dsaddr;
1082
1083         dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags);
1084         if (!dsaddr)
1085                 return NULL;
1086         return &dsaddr->id_node;
1087 }
1088
1089 static void
1090 filelayout_free_deviceid_node(struct nfs4_deviceid_node *d)
1091 {
1092         nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
1093 }
1094
1095 static struct pnfs_layout_hdr *
1096 filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
1097 {
1098         struct nfs4_filelayout *flo;
1099
1100         flo = kzalloc(sizeof(*flo), gfp_flags);
1101         return flo != NULL ? &flo->generic_hdr : NULL;
1102 }
1103
1104 static void
1105 filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
1106 {
1107         kfree(FILELAYOUT_FROM_HDR(lo));
1108 }
1109
1110 static struct pnfs_ds_commit_info *
1111 filelayout_get_ds_info(struct inode *inode)
1112 {
1113         struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1114
1115         if (layout == NULL)
1116                 return NULL;
1117         else
1118                 return &FILELAYOUT_FROM_HDR(layout)->commit_info;
1119 }
1120
1121 static struct pnfs_layoutdriver_type filelayout_type = {
1122         .id                     = LAYOUT_NFSV4_1_FILES,
1123         .name                   = "LAYOUT_NFSV4_1_FILES",
1124         .owner                  = THIS_MODULE,
1125         .alloc_layout_hdr       = filelayout_alloc_layout_hdr,
1126         .free_layout_hdr        = filelayout_free_layout_hdr,
1127         .alloc_lseg             = filelayout_alloc_lseg,
1128         .free_lseg              = filelayout_free_lseg,
1129         .pg_read_ops            = &filelayout_pg_read_ops,
1130         .pg_write_ops           = &filelayout_pg_write_ops,
1131         .get_ds_info            = &filelayout_get_ds_info,
1132         .mark_request_commit    = filelayout_mark_request_commit,
1133         .clear_request_commit   = pnfs_generic_clear_request_commit,
1134         .scan_commit_lists      = pnfs_generic_scan_commit_lists,
1135         .recover_commit_reqs    = pnfs_generic_recover_commit_reqs,
1136         .search_commit_reqs     = filelayout_search_commit_reqs,
1137         .commit_pagelist        = filelayout_commit_pagelist,
1138         .read_pagelist          = filelayout_read_pagelist,
1139         .write_pagelist         = filelayout_write_pagelist,
1140         .alloc_deviceid_node    = filelayout_alloc_deviceid_node,
1141         .free_deviceid_node     = filelayout_free_deviceid_node,
1142         .sync                   = pnfs_nfs_generic_sync,
1143 };
1144
1145 static int __init nfs4filelayout_init(void)
1146 {
1147         printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
1148                __func__);
1149         return pnfs_register_layoutdriver(&filelayout_type);
1150 }
1151
1152 static void __exit nfs4filelayout_exit(void)
1153 {
1154         printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
1155                __func__);
1156         pnfs_unregister_layoutdriver(&filelayout_type);
1157 }
1158
1159 MODULE_ALIAS("nfs-layouttype4-1");
1160
1161 module_init(nfs4filelayout_init);
1162 module_exit(nfs4filelayout_exit);