linux/fs/nfs/nfs4filelayout.c
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   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 "internal.h"
  39#include "delegation.h"
  40#include "nfs4filelayout.h"
  41
  42#define NFSDBG_FACILITY         NFSDBG_PNFS_LD
  43
  44MODULE_LICENSE("GPL");
  45MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>");
  46MODULE_DESCRIPTION("The NFSv4 file layout driver");
  47
  48#define FILELAYOUT_POLL_RETRY_MAX     (15*HZ)
  49
  50static loff_t
  51filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
  52                            loff_t offset)
  53{
  54        u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count;
  55        u64 stripe_no;
  56        u32 rem;
  57
  58        offset -= flseg->pattern_offset;
  59        stripe_no = div_u64(offset, stripe_width);
  60        div_u64_rem(offset, flseg->stripe_unit, &rem);
  61
  62        return stripe_no * flseg->stripe_unit + rem;
  63}
  64
  65/* This function is used by the layout driver to calculate the
  66 * offset of the file on the dserver based on whether the
  67 * layout type is STRIPE_DENSE or STRIPE_SPARSE
  68 */
  69static loff_t
  70filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset)
  71{
  72        struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
  73
  74        switch (flseg->stripe_type) {
  75        case STRIPE_SPARSE:
  76                return offset;
  77
  78        case STRIPE_DENSE:
  79                return filelayout_get_dense_offset(flseg, offset);
  80        }
  81
  82        BUG();
  83}
  84
  85static void filelayout_reset_write(struct nfs_write_data *data)
  86{
  87        struct nfs_pgio_header *hdr = data->header;
  88        struct rpc_task *task = &data->task;
  89
  90        if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
  91                dprintk("%s Reset task %5u for i/o through MDS "
  92                        "(req %s/%lld, %u bytes @ offset %llu)\n", __func__,
  93                        data->task.tk_pid,
  94                        hdr->inode->i_sb->s_id,
  95                        (long long)NFS_FILEID(hdr->inode),
  96                        data->args.count,
  97                        (unsigned long long)data->args.offset);
  98
  99                task->tk_status = pnfs_write_done_resend_to_mds(hdr->inode,
 100                                                        &hdr->pages,
 101                                                        hdr->completion_ops);
 102        }
 103}
 104
 105static void filelayout_reset_read(struct nfs_read_data *data)
 106{
 107        struct nfs_pgio_header *hdr = data->header;
 108        struct rpc_task *task = &data->task;
 109
 110        if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) {
 111                dprintk("%s Reset task %5u for i/o through MDS "
 112                        "(req %s/%lld, %u bytes @ offset %llu)\n", __func__,
 113                        data->task.tk_pid,
 114                        hdr->inode->i_sb->s_id,
 115                        (long long)NFS_FILEID(hdr->inode),
 116                        data->args.count,
 117                        (unsigned long long)data->args.offset);
 118
 119                task->tk_status = pnfs_read_done_resend_to_mds(hdr->inode,
 120                                                        &hdr->pages,
 121                                                        hdr->completion_ops);
 122        }
 123}
 124
 125static int filelayout_async_handle_error(struct rpc_task *task,
 126                                         struct nfs4_state *state,
 127                                         struct nfs_client *clp,
 128                                         struct pnfs_layout_segment *lseg)
 129{
 130        struct inode *inode = lseg->pls_layout->plh_inode;
 131        struct nfs_server *mds_server = NFS_SERVER(inode);
 132        struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
 133        struct nfs_client *mds_client = mds_server->nfs_client;
 134        struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
 135
 136        if (task->tk_status >= 0)
 137                return 0;
 138
 139        switch (task->tk_status) {
 140        /* MDS state errors */
 141        case -NFS4ERR_DELEG_REVOKED:
 142        case -NFS4ERR_ADMIN_REVOKED:
 143        case -NFS4ERR_BAD_STATEID:
 144                if (state == NULL)
 145                        break;
 146                nfs_remove_bad_delegation(state->inode);
 147        case -NFS4ERR_OPENMODE:
 148                if (state == NULL)
 149                        break;
 150                nfs4_schedule_stateid_recovery(mds_server, state);
 151                goto wait_on_recovery;
 152        case -NFS4ERR_EXPIRED:
 153                if (state != NULL)
 154                        nfs4_schedule_stateid_recovery(mds_server, state);
 155                nfs4_schedule_lease_recovery(mds_client);
 156                goto wait_on_recovery;
 157        /* DS session errors */
 158        case -NFS4ERR_BADSESSION:
 159        case -NFS4ERR_BADSLOT:
 160        case -NFS4ERR_BAD_HIGH_SLOT:
 161        case -NFS4ERR_DEADSESSION:
 162        case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 163        case -NFS4ERR_SEQ_FALSE_RETRY:
 164        case -NFS4ERR_SEQ_MISORDERED:
 165                dprintk("%s ERROR %d, Reset session. Exchangeid "
 166                        "flags 0x%x\n", __func__, task->tk_status,
 167                        clp->cl_exchange_flags);
 168                nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
 169                break;
 170        case -NFS4ERR_DELAY:
 171        case -NFS4ERR_GRACE:
 172        case -EKEYEXPIRED:
 173                rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
 174                break;
 175        case -NFS4ERR_RETRY_UNCACHED_REP:
 176                break;
 177        /* Invalidate Layout errors */
 178        case -NFS4ERR_PNFS_NO_LAYOUT:
 179        case -ESTALE:           /* mapped NFS4ERR_STALE */
 180        case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
 181        case -EISDIR:           /* mapped NFS4ERR_ISDIR */
 182        case -NFS4ERR_FHEXPIRED:
 183        case -NFS4ERR_WRONG_TYPE:
 184                dprintk("%s Invalid layout error %d\n", __func__,
 185                        task->tk_status);
 186                /*
 187                 * Destroy layout so new i/o will get a new layout.
 188                 * Layout will not be destroyed until all current lseg
 189                 * references are put. Mark layout as invalid to resend failed
 190                 * i/o and all i/o waiting on the slot table to the MDS until
 191                 * layout is destroyed and a new valid layout is obtained.
 192                 */
 193                set_bit(NFS_LAYOUT_INVALID,
 194                                &NFS_I(inode)->layout->plh_flags);
 195                pnfs_destroy_layout(NFS_I(inode));
 196                rpc_wake_up(&tbl->slot_tbl_waitq);
 197                goto reset;
 198        /* RPC connection errors */
 199        case -ECONNREFUSED:
 200        case -EHOSTDOWN:
 201        case -EHOSTUNREACH:
 202        case -ENETUNREACH:
 203        case -EIO:
 204        case -ETIMEDOUT:
 205        case -EPIPE:
 206                dprintk("%s DS connection error %d\n", __func__,
 207                        task->tk_status);
 208                filelayout_mark_devid_invalid(devid);
 209                clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags);
 210                _pnfs_return_layout(inode);
 211                rpc_wake_up(&tbl->slot_tbl_waitq);
 212                nfs4_ds_disconnect(clp);
 213                /* fall through */
 214        default:
 215reset:
 216                dprintk("%s Retry through MDS. Error %d\n", __func__,
 217                        task->tk_status);
 218                return -NFS4ERR_RESET_TO_MDS;
 219        }
 220out:
 221        task->tk_status = 0;
 222        return -EAGAIN;
 223wait_on_recovery:
 224        rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
 225        if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
 226                rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
 227        goto out;
 228}
 229
 230/* NFS_PROTO call done callback routines */
 231
 232static int filelayout_read_done_cb(struct rpc_task *task,
 233                                struct nfs_read_data *data)
 234{
 235        struct nfs_pgio_header *hdr = data->header;
 236        int err;
 237
 238        err = filelayout_async_handle_error(task, data->args.context->state,
 239                                            data->ds_clp, hdr->lseg);
 240
 241        switch (err) {
 242        case -NFS4ERR_RESET_TO_MDS:
 243                filelayout_reset_read(data);
 244                return task->tk_status;
 245        case -EAGAIN:
 246                rpc_restart_call_prepare(task);
 247                return -EAGAIN;
 248        }
 249
 250        return 0;
 251}
 252
 253/*
 254 * We reference the rpc_cred of the first WRITE that triggers the need for
 255 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
 256 * rfc5661 is not clear about which credential should be used.
 257 */
 258static void
 259filelayout_set_layoutcommit(struct nfs_write_data *wdata)
 260{
 261        struct nfs_pgio_header *hdr = wdata->header;
 262
 263        if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
 264            wdata->res.verf->committed == NFS_FILE_SYNC)
 265                return;
 266
 267        pnfs_set_layoutcommit(wdata);
 268        dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
 269                (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
 270}
 271
 272/*
 273 * Call ops for the async read/write cases
 274 * In the case of dense layouts, the offset needs to be reset to its
 275 * original value.
 276 */
 277static void filelayout_read_prepare(struct rpc_task *task, void *data)
 278{
 279        struct nfs_read_data *rdata = data;
 280
 281        if (filelayout_reset_to_mds(rdata->header->lseg)) {
 282                dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
 283                filelayout_reset_read(rdata);
 284                rpc_exit(task, 0);
 285                return;
 286        }
 287        rdata->read_done_cb = filelayout_read_done_cb;
 288
 289        if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
 290                                &rdata->args.seq_args, &rdata->res.seq_res,
 291                                task))
 292                return;
 293
 294        rpc_call_start(task);
 295}
 296
 297static void filelayout_read_call_done(struct rpc_task *task, void *data)
 298{
 299        struct nfs_read_data *rdata = data;
 300
 301        dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
 302
 303        if (test_bit(NFS_IOHDR_REDO, &rdata->header->flags) &&
 304            task->tk_status == 0)
 305                return;
 306
 307        /* Note this may cause RPC to be resent */
 308        rdata->header->mds_ops->rpc_call_done(task, data);
 309}
 310
 311static void filelayout_read_count_stats(struct rpc_task *task, void *data)
 312{
 313        struct nfs_read_data *rdata = data;
 314
 315        rpc_count_iostats(task, NFS_SERVER(rdata->header->inode)->client->cl_metrics);
 316}
 317
 318static void filelayout_read_release(void *data)
 319{
 320        struct nfs_read_data *rdata = data;
 321
 322        nfs_put_client(rdata->ds_clp);
 323        rdata->header->mds_ops->rpc_release(data);
 324}
 325
 326static int filelayout_write_done_cb(struct rpc_task *task,
 327                                struct nfs_write_data *data)
 328{
 329        struct nfs_pgio_header *hdr = data->header;
 330        int err;
 331
 332        err = filelayout_async_handle_error(task, data->args.context->state,
 333                                            data->ds_clp, hdr->lseg);
 334
 335        switch (err) {
 336        case -NFS4ERR_RESET_TO_MDS:
 337                filelayout_reset_write(data);
 338                return task->tk_status;
 339        case -EAGAIN:
 340                rpc_restart_call_prepare(task);
 341                return -EAGAIN;
 342        }
 343
 344        filelayout_set_layoutcommit(data);
 345        return 0;
 346}
 347
 348/* Fake up some data that will cause nfs_commit_release to retry the writes. */
 349static void prepare_to_resend_writes(struct nfs_commit_data *data)
 350{
 351        struct nfs_page *first = nfs_list_entry(data->pages.next);
 352
 353        data->task.tk_status = 0;
 354        memcpy(&data->verf.verifier, &first->wb_verf,
 355               sizeof(data->verf.verifier));
 356        data->verf.verifier.data[0]++; /* ensure verifier mismatch */
 357}
 358
 359static int filelayout_commit_done_cb(struct rpc_task *task,
 360                                     struct nfs_commit_data *data)
 361{
 362        int err;
 363
 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                prepare_to_resend_writes(data);
 370                return -EAGAIN;
 371        case -EAGAIN:
 372                rpc_restart_call_prepare(task);
 373                return -EAGAIN;
 374        }
 375
 376        return 0;
 377}
 378
 379static void filelayout_write_prepare(struct rpc_task *task, void *data)
 380{
 381        struct nfs_write_data *wdata = data;
 382
 383        if (filelayout_reset_to_mds(wdata->header->lseg)) {
 384                dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
 385                filelayout_reset_write(wdata);
 386                rpc_exit(task, 0);
 387                return;
 388        }
 389        if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
 390                                &wdata->args.seq_args, &wdata->res.seq_res,
 391                                task))
 392                return;
 393
 394        rpc_call_start(task);
 395}
 396
 397static void filelayout_write_call_done(struct rpc_task *task, void *data)
 398{
 399        struct nfs_write_data *wdata = data;
 400
 401        if (test_bit(NFS_IOHDR_REDO, &wdata->header->flags) &&
 402            task->tk_status == 0)
 403                return;
 404
 405        /* Note this may cause RPC to be resent */
 406        wdata->header->mds_ops->rpc_call_done(task, data);
 407}
 408
 409static void filelayout_write_count_stats(struct rpc_task *task, void *data)
 410{
 411        struct nfs_write_data *wdata = data;
 412
 413        rpc_count_iostats(task, NFS_SERVER(wdata->header->inode)->client->cl_metrics);
 414}
 415
 416static void filelayout_write_release(void *data)
 417{
 418        struct nfs_write_data *wdata = data;
 419
 420        nfs_put_client(wdata->ds_clp);
 421        wdata->header->mds_ops->rpc_release(data);
 422}
 423
 424static void filelayout_commit_prepare(struct rpc_task *task, void *data)
 425{
 426        struct nfs_commit_data *wdata = data;
 427
 428        if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
 429                                &wdata->args.seq_args, &wdata->res.seq_res,
 430                                task))
 431                return;
 432
 433        rpc_call_start(task);
 434}
 435
 436static void filelayout_write_commit_done(struct rpc_task *task, void *data)
 437{
 438        struct nfs_commit_data *wdata = data;
 439
 440        /* Note this may cause RPC to be resent */
 441        wdata->mds_ops->rpc_call_done(task, data);
 442}
 443
 444static void filelayout_commit_count_stats(struct rpc_task *task, void *data)
 445{
 446        struct nfs_commit_data *cdata = data;
 447
 448        rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics);
 449}
 450
 451static void filelayout_commit_release(void *calldata)
 452{
 453        struct nfs_commit_data *data = calldata;
 454
 455        data->completion_ops->completion(data);
 456        put_lseg(data->lseg);
 457        nfs_put_client(data->ds_clp);
 458        nfs_commitdata_release(data);
 459}
 460
 461static const struct rpc_call_ops filelayout_read_call_ops = {
 462        .rpc_call_prepare = filelayout_read_prepare,
 463        .rpc_call_done = filelayout_read_call_done,
 464        .rpc_count_stats = filelayout_read_count_stats,
 465        .rpc_release = filelayout_read_release,
 466};
 467
 468static const struct rpc_call_ops filelayout_write_call_ops = {
 469        .rpc_call_prepare = filelayout_write_prepare,
 470        .rpc_call_done = filelayout_write_call_done,
 471        .rpc_count_stats = filelayout_write_count_stats,
 472        .rpc_release = filelayout_write_release,
 473};
 474
 475static const struct rpc_call_ops filelayout_commit_call_ops = {
 476        .rpc_call_prepare = filelayout_commit_prepare,
 477        .rpc_call_done = filelayout_write_commit_done,
 478        .rpc_count_stats = filelayout_commit_count_stats,
 479        .rpc_release = filelayout_commit_release,
 480};
 481
 482static enum pnfs_try_status
 483filelayout_read_pagelist(struct nfs_read_data *data)
 484{
 485        struct nfs_pgio_header *hdr = data->header;
 486        struct pnfs_layout_segment *lseg = hdr->lseg;
 487        struct nfs4_pnfs_ds *ds;
 488        loff_t offset = data->args.offset;
 489        u32 j, idx;
 490        struct nfs_fh *fh;
 491        int status;
 492
 493        dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
 494                __func__, hdr->inode->i_ino,
 495                data->args.pgbase, (size_t)data->args.count, offset);
 496
 497        /* Retrieve the correct rpc_client for the byte range */
 498        j = nfs4_fl_calc_j_index(lseg, offset);
 499        idx = nfs4_fl_calc_ds_index(lseg, j);
 500        ds = nfs4_fl_prepare_ds(lseg, idx);
 501        if (!ds)
 502                return PNFS_NOT_ATTEMPTED;
 503        dprintk("%s USE DS: %s cl_count %d\n", __func__,
 504                ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
 505
 506        /* No multipath support. Use first DS */
 507        atomic_inc(&ds->ds_clp->cl_count);
 508        data->ds_clp = ds->ds_clp;
 509        fh = nfs4_fl_select_ds_fh(lseg, j);
 510        if (fh)
 511                data->args.fh = fh;
 512
 513        data->args.offset = filelayout_get_dserver_offset(lseg, offset);
 514        data->mds_offset = offset;
 515
 516        /* Perform an asynchronous read to ds */
 517        status = nfs_initiate_read(ds->ds_clp->cl_rpcclient, data,
 518                                  &filelayout_read_call_ops, RPC_TASK_SOFTCONN);
 519        BUG_ON(status != 0);
 520        return PNFS_ATTEMPTED;
 521}
 522
 523/* Perform async writes. */
 524static enum pnfs_try_status
 525filelayout_write_pagelist(struct nfs_write_data *data, int sync)
 526{
 527        struct nfs_pgio_header *hdr = data->header;
 528        struct pnfs_layout_segment *lseg = hdr->lseg;
 529        struct nfs4_pnfs_ds *ds;
 530        loff_t offset = data->args.offset;
 531        u32 j, idx;
 532        struct nfs_fh *fh;
 533        int status;
 534
 535        /* Retrieve the correct rpc_client for the byte range */
 536        j = nfs4_fl_calc_j_index(lseg, offset);
 537        idx = nfs4_fl_calc_ds_index(lseg, j);
 538        ds = nfs4_fl_prepare_ds(lseg, idx);
 539        if (!ds)
 540                return PNFS_NOT_ATTEMPTED;
 541        dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
 542                __func__, hdr->inode->i_ino, sync, (size_t) data->args.count,
 543                offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
 544
 545        data->write_done_cb = filelayout_write_done_cb;
 546        atomic_inc(&ds->ds_clp->cl_count);
 547        data->ds_clp = ds->ds_clp;
 548        fh = nfs4_fl_select_ds_fh(lseg, j);
 549        if (fh)
 550                data->args.fh = fh;
 551        /*
 552         * Get the file offset on the dserver. Set the write offset to
 553         * this offset and save the original offset.
 554         */
 555        data->args.offset = filelayout_get_dserver_offset(lseg, offset);
 556
 557        /* Perform an asynchronous write */
 558        status = nfs_initiate_write(ds->ds_clp->cl_rpcclient, data,
 559                                    &filelayout_write_call_ops, sync,
 560                                    RPC_TASK_SOFTCONN);
 561        BUG_ON(status != 0);
 562        return PNFS_ATTEMPTED;
 563}
 564
 565/*
 566 * filelayout_check_layout()
 567 *
 568 * Make sure layout segment parameters are sane WRT the device.
 569 * At this point no generic layer initialization of the lseg has occurred,
 570 * and nothing has been added to the layout_hdr cache.
 571 *
 572 */
 573static int
 574filelayout_check_layout(struct pnfs_layout_hdr *lo,
 575                        struct nfs4_filelayout_segment *fl,
 576                        struct nfs4_layoutget_res *lgr,
 577                        struct nfs4_deviceid *id,
 578                        gfp_t gfp_flags)
 579{
 580        struct nfs4_deviceid_node *d;
 581        struct nfs4_file_layout_dsaddr *dsaddr;
 582        int status = -EINVAL;
 583        struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
 584
 585        dprintk("--> %s\n", __func__);
 586
 587        /* FIXME: remove this check when layout segment support is added */
 588        if (lgr->range.offset != 0 ||
 589            lgr->range.length != NFS4_MAX_UINT64) {
 590                dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
 591                        __func__);
 592                goto out;
 593        }
 594
 595        if (fl->pattern_offset > lgr->range.offset) {
 596                dprintk("%s pattern_offset %lld too large\n",
 597                                __func__, fl->pattern_offset);
 598                goto out;
 599        }
 600
 601        if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
 602                dprintk("%s Invalid stripe unit (%u)\n",
 603                        __func__, fl->stripe_unit);
 604                goto out;
 605        }
 606
 607        /* find and reference the deviceid */
 608        d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
 609                                   NFS_SERVER(lo->plh_inode)->nfs_client, id);
 610        if (d == NULL) {
 611                dsaddr = get_device_info(lo->plh_inode, id, gfp_flags);
 612                if (dsaddr == NULL)
 613                        goto out;
 614        } else
 615                dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
 616        /* Found deviceid is being reaped */
 617        if (test_bit(NFS_DEVICEID_INVALID, &dsaddr->id_node.flags))
 618                        goto out_put;
 619
 620        fl->dsaddr = dsaddr;
 621
 622        if (fl->first_stripe_index >= dsaddr->stripe_count) {
 623                dprintk("%s Bad first_stripe_index %u\n",
 624                                __func__, fl->first_stripe_index);
 625                goto out_put;
 626        }
 627
 628        if ((fl->stripe_type == STRIPE_SPARSE &&
 629            fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
 630            (fl->stripe_type == STRIPE_DENSE &&
 631            fl->num_fh != dsaddr->stripe_count)) {
 632                dprintk("%s num_fh %u not valid for given packing\n",
 633                        __func__, fl->num_fh);
 634                goto out_put;
 635        }
 636
 637        if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
 638                dprintk("%s Stripe unit (%u) not aligned with rsize %u "
 639                        "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
 640                        nfss->wsize);
 641        }
 642
 643        status = 0;
 644out:
 645        dprintk("--> %s returns %d\n", __func__, status);
 646        return status;
 647out_put:
 648        nfs4_fl_put_deviceid(dsaddr);
 649        goto out;
 650}
 651
 652static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
 653{
 654        int i;
 655
 656        for (i = 0; i < fl->num_fh; i++) {
 657                if (!fl->fh_array[i])
 658                        break;
 659                kfree(fl->fh_array[i]);
 660        }
 661        kfree(fl->fh_array);
 662        fl->fh_array = NULL;
 663}
 664
 665static void
 666_filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
 667{
 668        filelayout_free_fh_array(fl);
 669        kfree(fl);
 670}
 671
 672static int
 673filelayout_decode_layout(struct pnfs_layout_hdr *flo,
 674                         struct nfs4_filelayout_segment *fl,
 675                         struct nfs4_layoutget_res *lgr,
 676                         struct nfs4_deviceid *id,
 677                         gfp_t gfp_flags)
 678{
 679        struct xdr_stream stream;
 680        struct xdr_buf buf;
 681        struct page *scratch;
 682        __be32 *p;
 683        uint32_t nfl_util;
 684        int i;
 685
 686        dprintk("%s: set_layout_map Begin\n", __func__);
 687
 688        scratch = alloc_page(gfp_flags);
 689        if (!scratch)
 690                return -ENOMEM;
 691
 692        xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
 693        xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
 694
 695        /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
 696         * num_fh (4) */
 697        p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
 698        if (unlikely(!p))
 699                goto out_err;
 700
 701        memcpy(id, p, sizeof(*id));
 702        p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
 703        nfs4_print_deviceid(id);
 704
 705        nfl_util = be32_to_cpup(p++);
 706        if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
 707                fl->commit_through_mds = 1;
 708        if (nfl_util & NFL4_UFLG_DENSE)
 709                fl->stripe_type = STRIPE_DENSE;
 710        else
 711                fl->stripe_type = STRIPE_SPARSE;
 712        fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
 713
 714        fl->first_stripe_index = be32_to_cpup(p++);
 715        p = xdr_decode_hyper(p, &fl->pattern_offset);
 716        fl->num_fh = be32_to_cpup(p++);
 717
 718        dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
 719                __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
 720                fl->pattern_offset);
 721
 722        /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
 723         * Futher checking is done in filelayout_check_layout */
 724        if (fl->num_fh >
 725            max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
 726                goto out_err;
 727
 728        if (fl->num_fh > 0) {
 729                fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
 730                                       gfp_flags);
 731                if (!fl->fh_array)
 732                        goto out_err;
 733        }
 734
 735        for (i = 0; i < fl->num_fh; i++) {
 736                /* Do we want to use a mempool here? */
 737                fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
 738                if (!fl->fh_array[i])
 739                        goto out_err_free;
 740
 741                p = xdr_inline_decode(&stream, 4);
 742                if (unlikely(!p))
 743                        goto out_err_free;
 744                fl->fh_array[i]->size = be32_to_cpup(p++);
 745                if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
 746                        printk(KERN_ERR "NFS: Too big fh %d received %d\n",
 747                               i, fl->fh_array[i]->size);
 748                        goto out_err_free;
 749                }
 750
 751                p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
 752                if (unlikely(!p))
 753                        goto out_err_free;
 754                memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
 755                dprintk("DEBUG: %s: fh len %d\n", __func__,
 756                        fl->fh_array[i]->size);
 757        }
 758
 759        __free_page(scratch);
 760        return 0;
 761
 762out_err_free:
 763        filelayout_free_fh_array(fl);
 764out_err:
 765        __free_page(scratch);
 766        return -EIO;
 767}
 768
 769static void
 770filelayout_free_lseg(struct pnfs_layout_segment *lseg)
 771{
 772        struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
 773
 774        dprintk("--> %s\n", __func__);
 775        nfs4_fl_put_deviceid(fl->dsaddr);
 776        /* This assumes a single RW lseg */
 777        if (lseg->pls_range.iomode == IOMODE_RW) {
 778                struct nfs4_filelayout *flo;
 779
 780                flo = FILELAYOUT_FROM_HDR(lseg->pls_layout);
 781                flo->commit_info.nbuckets = 0;
 782                kfree(flo->commit_info.buckets);
 783                flo->commit_info.buckets = NULL;
 784        }
 785        _filelayout_free_lseg(fl);
 786}
 787
 788static int
 789filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg,
 790                             struct nfs_commit_info *cinfo,
 791                             gfp_t gfp_flags)
 792{
 793        struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
 794        struct pnfs_commit_bucket *buckets;
 795        int size;
 796
 797        if (fl->commit_through_mds)
 798                return 0;
 799        if (cinfo->ds->nbuckets != 0) {
 800                /* This assumes there is only one IOMODE_RW lseg.  What
 801                 * we really want to do is have a layout_hdr level
 802                 * dictionary of <multipath_list4, fh> keys, each
 803                 * associated with a struct list_head, populated by calls
 804                 * to filelayout_write_pagelist().
 805                 * */
 806                return 0;
 807        }
 808
 809        size = (fl->stripe_type == STRIPE_SPARSE) ?
 810                fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
 811
 812        buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
 813                          gfp_flags);
 814        if (!buckets)
 815                return -ENOMEM;
 816        else {
 817                int i;
 818
 819                spin_lock(cinfo->lock);
 820                if (cinfo->ds->nbuckets != 0)
 821                        kfree(buckets);
 822                else {
 823                        cinfo->ds->buckets = buckets;
 824                        cinfo->ds->nbuckets = size;
 825                        for (i = 0; i < size; i++) {
 826                                INIT_LIST_HEAD(&buckets[i].written);
 827                                INIT_LIST_HEAD(&buckets[i].committing);
 828                        }
 829                }
 830                spin_unlock(cinfo->lock);
 831                return 0;
 832        }
 833}
 834
 835static struct pnfs_layout_segment *
 836filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
 837                      struct nfs4_layoutget_res *lgr,
 838                      gfp_t gfp_flags)
 839{
 840        struct nfs4_filelayout_segment *fl;
 841        int rc;
 842        struct nfs4_deviceid id;
 843
 844        dprintk("--> %s\n", __func__);
 845        fl = kzalloc(sizeof(*fl), gfp_flags);
 846        if (!fl)
 847                return NULL;
 848
 849        rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
 850        if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
 851                _filelayout_free_lseg(fl);
 852                return NULL;
 853        }
 854        return &fl->generic_hdr;
 855}
 856
 857/*
 858 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
 859 *
 860 * return true  : coalesce page
 861 * return false : don't coalesce page
 862 */
 863static bool
 864filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
 865                   struct nfs_page *req)
 866{
 867        u64 p_stripe, r_stripe;
 868        u32 stripe_unit;
 869
 870        if (!pnfs_generic_pg_test(pgio, prev, req) ||
 871            !nfs_generic_pg_test(pgio, prev, req))
 872                return false;
 873
 874        p_stripe = (u64)req_offset(prev);
 875        r_stripe = (u64)req_offset(req);
 876        stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
 877
 878        do_div(p_stripe, stripe_unit);
 879        do_div(r_stripe, stripe_unit);
 880
 881        return (p_stripe == r_stripe);
 882}
 883
 884static void
 885filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
 886                        struct nfs_page *req)
 887{
 888        BUG_ON(pgio->pg_lseg != NULL);
 889
 890        if (req->wb_offset != req->wb_pgbase) {
 891                /*
 892                 * Handling unaligned pages is difficult, because have to
 893                 * somehow split a req in two in certain cases in the
 894                 * pg.test code.  Avoid this by just not using pnfs
 895                 * in this case.
 896                 */
 897                nfs_pageio_reset_read_mds(pgio);
 898                return;
 899        }
 900        pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 901                                           req->wb_context,
 902                                           0,
 903                                           NFS4_MAX_UINT64,
 904                                           IOMODE_READ,
 905                                           GFP_KERNEL);
 906        /* If no lseg, fall back to read through mds */
 907        if (pgio->pg_lseg == NULL)
 908                nfs_pageio_reset_read_mds(pgio);
 909}
 910
 911static void
 912filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
 913                         struct nfs_page *req)
 914{
 915        struct nfs_commit_info cinfo;
 916        int status;
 917
 918        BUG_ON(pgio->pg_lseg != NULL);
 919
 920        if (req->wb_offset != req->wb_pgbase)
 921                goto out_mds;
 922        pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 923                                           req->wb_context,
 924                                           0,
 925                                           NFS4_MAX_UINT64,
 926                                           IOMODE_RW,
 927                                           GFP_NOFS);
 928        /* If no lseg, fall back to write through mds */
 929        if (pgio->pg_lseg == NULL)
 930                goto out_mds;
 931        nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
 932        status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
 933        if (status < 0) {
 934                put_lseg(pgio->pg_lseg);
 935                pgio->pg_lseg = NULL;
 936                goto out_mds;
 937        }
 938        return;
 939out_mds:
 940        nfs_pageio_reset_write_mds(pgio);
 941}
 942
 943static const struct nfs_pageio_ops filelayout_pg_read_ops = {
 944        .pg_init = filelayout_pg_init_read,
 945        .pg_test = filelayout_pg_test,
 946        .pg_doio = pnfs_generic_pg_readpages,
 947};
 948
 949static const struct nfs_pageio_ops filelayout_pg_write_ops = {
 950        .pg_init = filelayout_pg_init_write,
 951        .pg_test = filelayout_pg_test,
 952        .pg_doio = pnfs_generic_pg_writepages,
 953};
 954
 955static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
 956{
 957        if (fl->stripe_type == STRIPE_SPARSE)
 958                return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
 959        else
 960                return j;
 961}
 962
 963/* The generic layer is about to remove the req from the commit list.
 964 * If this will make the bucket empty, it will need to put the lseg reference.
 965 */
 966static void
 967filelayout_clear_request_commit(struct nfs_page *req,
 968                                struct nfs_commit_info *cinfo)
 969{
 970        struct pnfs_layout_segment *freeme = NULL;
 971
 972        spin_lock(cinfo->lock);
 973        if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
 974                goto out;
 975        cinfo->ds->nwritten--;
 976        if (list_is_singular(&req->wb_list)) {
 977                struct pnfs_commit_bucket *bucket;
 978
 979                bucket = list_first_entry(&req->wb_list,
 980                                          struct pnfs_commit_bucket,
 981                                          written);
 982                freeme = bucket->wlseg;
 983                bucket->wlseg = NULL;
 984        }
 985out:
 986        nfs_request_remove_commit_list(req, cinfo);
 987        spin_unlock(cinfo->lock);
 988        put_lseg(freeme);
 989}
 990
 991static struct list_head *
 992filelayout_choose_commit_list(struct nfs_page *req,
 993                              struct pnfs_layout_segment *lseg,
 994                              struct nfs_commit_info *cinfo)
 995{
 996        struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
 997        u32 i, j;
 998        struct list_head *list;
 999        struct pnfs_commit_bucket *buckets;
1000
1001        if (fl->commit_through_mds)
1002                return &cinfo->mds->list;
1003
1004        /* Note that we are calling nfs4_fl_calc_j_index on each page
1005         * that ends up being committed to a data server.  An attractive
1006         * alternative is to add a field to nfs_write_data and nfs_page
1007         * to store the value calculated in filelayout_write_pagelist
1008         * and just use that here.
1009         */
1010        j = nfs4_fl_calc_j_index(lseg, req_offset(req));
1011        i = select_bucket_index(fl, j);
1012        buckets = cinfo->ds->buckets;
1013        list = &buckets[i].written;
1014        if (list_empty(list)) {
1015                /* Non-empty buckets hold a reference on the lseg.  That ref
1016                 * is normally transferred to the COMMIT call and released
1017                 * there.  It could also be released if the last req is pulled
1018                 * off due to a rewrite, in which case it will be done in
1019                 * filelayout_clear_request_commit
1020                 */
1021                buckets[i].wlseg = get_lseg(lseg);
1022        }
1023        set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1024        cinfo->ds->nwritten++;
1025        return list;
1026}
1027
1028static void
1029filelayout_mark_request_commit(struct nfs_page *req,
1030                               struct pnfs_layout_segment *lseg,
1031                               struct nfs_commit_info *cinfo)
1032{
1033        struct list_head *list;
1034
1035        list = filelayout_choose_commit_list(req, lseg, cinfo);
1036        nfs_request_add_commit_list(req, list, cinfo);
1037}
1038
1039static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1040{
1041        struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1042
1043        if (flseg->stripe_type == STRIPE_SPARSE)
1044                return i;
1045        else
1046                return nfs4_fl_calc_ds_index(lseg, i);
1047}
1048
1049static struct nfs_fh *
1050select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1051{
1052        struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1053
1054        if (flseg->stripe_type == STRIPE_SPARSE) {
1055                if (flseg->num_fh == 1)
1056                        i = 0;
1057                else if (flseg->num_fh == 0)
1058                        /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
1059                        return NULL;
1060        }
1061        return flseg->fh_array[i];
1062}
1063
1064static int filelayout_initiate_commit(struct nfs_commit_data *data, int how)
1065{
1066        struct pnfs_layout_segment *lseg = data->lseg;
1067        struct nfs4_pnfs_ds *ds;
1068        u32 idx;
1069        struct nfs_fh *fh;
1070
1071        idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1072        ds = nfs4_fl_prepare_ds(lseg, idx);
1073        if (!ds) {
1074                prepare_to_resend_writes(data);
1075                filelayout_commit_release(data);
1076                return -EAGAIN;
1077        }
1078        dprintk("%s ino %lu, how %d cl_count %d\n", __func__,
1079                data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count));
1080        data->commit_done_cb = filelayout_commit_done_cb;
1081        atomic_inc(&ds->ds_clp->cl_count);
1082        data->ds_clp = ds->ds_clp;
1083        fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1084        if (fh)
1085                data->args.fh = fh;
1086        return nfs_initiate_commit(ds->ds_clp->cl_rpcclient, data,
1087                                   &filelayout_commit_call_ops, how,
1088                                   RPC_TASK_SOFTCONN);
1089}
1090
1091static int
1092transfer_commit_list(struct list_head *src, struct list_head *dst,
1093                     struct nfs_commit_info *cinfo, int max)
1094{
1095        struct nfs_page *req, *tmp;
1096        int ret = 0;
1097
1098        list_for_each_entry_safe(req, tmp, src, wb_list) {
1099                if (!nfs_lock_request(req))
1100                        continue;
1101                kref_get(&req->wb_kref);
1102                if (cond_resched_lock(cinfo->lock))
1103                        list_safe_reset_next(req, tmp, wb_list);
1104                nfs_request_remove_commit_list(req, cinfo);
1105                clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1106                nfs_list_add_request(req, dst);
1107                ret++;
1108                if ((ret == max) && !cinfo->dreq)
1109                        break;
1110        }
1111        return ret;
1112}
1113
1114static int
1115filelayout_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
1116                               struct nfs_commit_info *cinfo,
1117                               int max)
1118{
1119        struct list_head *src = &bucket->written;
1120        struct list_head *dst = &bucket->committing;
1121        int ret;
1122
1123        ret = transfer_commit_list(src, dst, cinfo, max);
1124        if (ret) {
1125                cinfo->ds->nwritten -= ret;
1126                cinfo->ds->ncommitting += ret;
1127                bucket->clseg = bucket->wlseg;
1128                if (list_empty(src))
1129                        bucket->wlseg = NULL;
1130                else
1131                        get_lseg(bucket->clseg);
1132        }
1133        return ret;
1134}
1135
1136/* Move reqs from written to committing lists, returning count of number moved.
1137 * Note called with cinfo->lock held.
1138 */
1139static int filelayout_scan_commit_lists(struct nfs_commit_info *cinfo,
1140                                        int max)
1141{
1142        int i, rv = 0, cnt;
1143
1144        for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
1145                cnt = filelayout_scan_ds_commit_list(&cinfo->ds->buckets[i],
1146                                                     cinfo, max);
1147                max -= cnt;
1148                rv += cnt;
1149        }
1150        return rv;
1151}
1152
1153/* Pull everything off the committing lists and dump into @dst */
1154static void filelayout_recover_commit_reqs(struct list_head *dst,
1155                                           struct nfs_commit_info *cinfo)
1156{
1157        struct pnfs_commit_bucket *b;
1158        int i;
1159
1160        /* NOTE cinfo->lock is NOT held, relying on fact that this is
1161         * only called on single thread per dreq.
1162         * Can't take the lock because need to do put_lseg
1163         */
1164        for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
1165                if (transfer_commit_list(&b->written, dst, cinfo, 0)) {
1166                        BUG_ON(!list_empty(&b->written));
1167                        put_lseg(b->wlseg);
1168                        b->wlseg = NULL;
1169                }
1170        }
1171        cinfo->ds->nwritten = 0;
1172}
1173
1174static unsigned int
1175alloc_ds_commits(struct nfs_commit_info *cinfo, struct list_head *list)
1176{
1177        struct pnfs_ds_commit_info *fl_cinfo;
1178        struct pnfs_commit_bucket *bucket;
1179        struct nfs_commit_data *data;
1180        int i, j;
1181        unsigned int nreq = 0;
1182
1183        fl_cinfo = cinfo->ds;
1184        bucket = fl_cinfo->buckets;
1185        for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
1186                if (list_empty(&bucket->committing))
1187                        continue;
1188                data = nfs_commitdata_alloc();
1189                if (!data)
1190                        break;
1191                data->ds_commit_index = i;
1192                data->lseg = bucket->clseg;
1193                bucket->clseg = NULL;
1194                list_add(&data->pages, list);
1195                nreq++;
1196        }
1197
1198        /* Clean up on error */
1199        for (j = i; j < fl_cinfo->nbuckets; j++, bucket++) {
1200                if (list_empty(&bucket->committing))
1201                        continue;
1202                nfs_retry_commit(&bucket->committing, bucket->clseg, cinfo);
1203                put_lseg(bucket->clseg);
1204                bucket->clseg = NULL;
1205        }
1206        /* Caller will clean up entries put on list */
1207        return nreq;
1208}
1209
1210/* This follows nfs_commit_list pretty closely */
1211static int
1212filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1213                           int how, struct nfs_commit_info *cinfo)
1214{
1215        struct nfs_commit_data *data, *tmp;
1216        LIST_HEAD(list);
1217        unsigned int nreq = 0;
1218
1219        if (!list_empty(mds_pages)) {
1220                data = nfs_commitdata_alloc();
1221                if (data != NULL) {
1222                        data->lseg = NULL;
1223                        list_add(&data->pages, &list);
1224                        nreq++;
1225                } else
1226                        nfs_retry_commit(mds_pages, NULL, cinfo);
1227        }
1228
1229        nreq += alloc_ds_commits(cinfo, &list);
1230
1231        if (nreq == 0) {
1232                cinfo->completion_ops->error_cleanup(NFS_I(inode));
1233                goto out;
1234        }
1235
1236        atomic_add(nreq, &cinfo->mds->rpcs_out);
1237
1238        list_for_each_entry_safe(data, tmp, &list, pages) {
1239                list_del_init(&data->pages);
1240                if (!data->lseg) {
1241                        nfs_init_commit(data, mds_pages, NULL, cinfo);
1242                        nfs_initiate_commit(NFS_CLIENT(inode), data,
1243                                            data->mds_ops, how, 0);
1244                } else {
1245                        struct pnfs_commit_bucket *buckets;
1246
1247                        buckets = cinfo->ds->buckets;
1248                        nfs_init_commit(data, &buckets[data->ds_commit_index].committing, data->lseg, cinfo);
1249                        filelayout_initiate_commit(data, how);
1250                }
1251        }
1252out:
1253        cinfo->ds->ncommitting = 0;
1254        return PNFS_ATTEMPTED;
1255}
1256
1257static void
1258filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
1259{
1260        nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
1261}
1262
1263static struct pnfs_layout_hdr *
1264filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
1265{
1266        struct nfs4_filelayout *flo;
1267
1268        flo = kzalloc(sizeof(*flo), gfp_flags);
1269        return &flo->generic_hdr;
1270}
1271
1272static void
1273filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
1274{
1275        kfree(FILELAYOUT_FROM_HDR(lo));
1276}
1277
1278static struct pnfs_ds_commit_info *
1279filelayout_get_ds_info(struct inode *inode)
1280{
1281        struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1282
1283        if (layout == NULL)
1284                return NULL;
1285        else
1286                return &FILELAYOUT_FROM_HDR(layout)->commit_info;
1287}
1288
1289static struct pnfs_layoutdriver_type filelayout_type = {
1290        .id                     = LAYOUT_NFSV4_1_FILES,
1291        .name                   = "LAYOUT_NFSV4_1_FILES",
1292        .owner                  = THIS_MODULE,
1293        .alloc_layout_hdr       = filelayout_alloc_layout_hdr,
1294        .free_layout_hdr        = filelayout_free_layout_hdr,
1295        .alloc_lseg             = filelayout_alloc_lseg,
1296        .free_lseg              = filelayout_free_lseg,
1297        .pg_read_ops            = &filelayout_pg_read_ops,
1298        .pg_write_ops           = &filelayout_pg_write_ops,
1299        .get_ds_info            = &filelayout_get_ds_info,
1300        .mark_request_commit    = filelayout_mark_request_commit,
1301        .clear_request_commit   = filelayout_clear_request_commit,
1302        .scan_commit_lists      = filelayout_scan_commit_lists,
1303        .recover_commit_reqs    = filelayout_recover_commit_reqs,
1304        .commit_pagelist        = filelayout_commit_pagelist,
1305        .read_pagelist          = filelayout_read_pagelist,
1306        .write_pagelist         = filelayout_write_pagelist,
1307        .free_deviceid_node     = filelayout_free_deveiceid_node,
1308};
1309
1310static int __init nfs4filelayout_init(void)
1311{
1312        printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
1313               __func__);
1314        return pnfs_register_layoutdriver(&filelayout_type);
1315}
1316
1317static void __exit nfs4filelayout_exit(void)
1318{
1319        printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
1320               __func__);
1321        pnfs_unregister_layoutdriver(&filelayout_type);
1322}
1323
1324MODULE_ALIAS("nfs-layouttype4-1");
1325
1326module_init(nfs4filelayout_init);
1327module_exit(nfs4filelayout_exit);
1328
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