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 void filelayout_fenceme(struct inode *inode, struct pnfs_layout_hdr *lo)
 126{
 127        if (!test_and_clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
 128                return;
 129        clear_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags);
 130        pnfs_return_layout(inode);
 131}
 132
 133static int filelayout_async_handle_error(struct rpc_task *task,
 134                                         struct nfs4_state *state,
 135                                         struct nfs_client *clp,
 136                                         struct pnfs_layout_segment *lseg)
 137{
 138        struct pnfs_layout_hdr *lo = lseg->pls_layout;
 139        struct inode *inode = lo->plh_inode;
 140        struct nfs_server *mds_server = NFS_SERVER(inode);
 141        struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg);
 142        struct nfs_client *mds_client = mds_server->nfs_client;
 143        struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table;
 144
 145        if (task->tk_status >= 0)
 146                return 0;
 147
 148        switch (task->tk_status) {
 149        /* MDS state errors */
 150        case -NFS4ERR_DELEG_REVOKED:
 151        case -NFS4ERR_ADMIN_REVOKED:
 152        case -NFS4ERR_BAD_STATEID:
 153                if (state == NULL)
 154                        break;
 155                nfs_remove_bad_delegation(state->inode);
 156        case -NFS4ERR_OPENMODE:
 157                if (state == NULL)
 158                        break;
 159                nfs4_schedule_stateid_recovery(mds_server, state);
 160                goto wait_on_recovery;
 161        case -NFS4ERR_EXPIRED:
 162                if (state != NULL)
 163                        nfs4_schedule_stateid_recovery(mds_server, state);
 164                nfs4_schedule_lease_recovery(mds_client);
 165                goto wait_on_recovery;
 166        /* DS session errors */
 167        case -NFS4ERR_BADSESSION:
 168        case -NFS4ERR_BADSLOT:
 169        case -NFS4ERR_BAD_HIGH_SLOT:
 170        case -NFS4ERR_DEADSESSION:
 171        case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 172        case -NFS4ERR_SEQ_FALSE_RETRY:
 173        case -NFS4ERR_SEQ_MISORDERED:
 174                dprintk("%s ERROR %d, Reset session. Exchangeid "
 175                        "flags 0x%x\n", __func__, task->tk_status,
 176                        clp->cl_exchange_flags);
 177                nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
 178                break;
 179        case -NFS4ERR_DELAY:
 180        case -NFS4ERR_GRACE:
 181        case -EKEYEXPIRED:
 182                rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX);
 183                break;
 184        case -NFS4ERR_RETRY_UNCACHED_REP:
 185                break;
 186        /* Invalidate Layout errors */
 187        case -NFS4ERR_PNFS_NO_LAYOUT:
 188        case -ESTALE:           /* mapped NFS4ERR_STALE */
 189        case -EBADHANDLE:       /* mapped NFS4ERR_BADHANDLE */
 190        case -EISDIR:           /* mapped NFS4ERR_ISDIR */
 191        case -NFS4ERR_FHEXPIRED:
 192        case -NFS4ERR_WRONG_TYPE:
 193                dprintk("%s Invalid layout error %d\n", __func__,
 194                        task->tk_status);
 195                /*
 196                 * Destroy layout so new i/o will get a new layout.
 197                 * Layout will not be destroyed until all current lseg
 198                 * references are put. Mark layout as invalid to resend failed
 199                 * i/o and all i/o waiting on the slot table to the MDS until
 200                 * layout is destroyed and a new valid layout is obtained.
 201                 */
 202                pnfs_destroy_layout(NFS_I(inode));
 203                rpc_wake_up(&tbl->slot_tbl_waitq);
 204                goto reset;
 205        /* RPC connection errors */
 206        case -ECONNREFUSED:
 207        case -EHOSTDOWN:
 208        case -EHOSTUNREACH:
 209        case -ENETUNREACH:
 210        case -EIO:
 211        case -ETIMEDOUT:
 212        case -EPIPE:
 213                dprintk("%s DS connection error %d\n", __func__,
 214                        task->tk_status);
 215                nfs4_mark_deviceid_unavailable(devid);
 216                set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
 217                rpc_wake_up(&tbl->slot_tbl_waitq);
 218                /* fall through */
 219        default:
 220reset:
 221                dprintk("%s Retry through MDS. Error %d\n", __func__,
 222                        task->tk_status);
 223                return -NFS4ERR_RESET_TO_MDS;
 224        }
 225out:
 226        task->tk_status = 0;
 227        return -EAGAIN;
 228wait_on_recovery:
 229        rpc_sleep_on(&mds_client->cl_rpcwaitq, task, NULL);
 230        if (test_bit(NFS4CLNT_MANAGER_RUNNING, &mds_client->cl_state) == 0)
 231                rpc_wake_up_queued_task(&mds_client->cl_rpcwaitq, task);
 232        goto out;
 233}
 234
 235/* NFS_PROTO call done callback routines */
 236
 237static int filelayout_read_done_cb(struct rpc_task *task,
 238                                struct nfs_read_data *data)
 239{
 240        struct nfs_pgio_header *hdr = data->header;
 241        int err;
 242
 243        err = filelayout_async_handle_error(task, data->args.context->state,
 244                                            data->ds_clp, hdr->lseg);
 245
 246        switch (err) {
 247        case -NFS4ERR_RESET_TO_MDS:
 248                filelayout_reset_read(data);
 249                return task->tk_status;
 250        case -EAGAIN:
 251                rpc_restart_call_prepare(task);
 252                return -EAGAIN;
 253        }
 254
 255        return 0;
 256}
 257
 258/*
 259 * We reference the rpc_cred of the first WRITE that triggers the need for
 260 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound.
 261 * rfc5661 is not clear about which credential should be used.
 262 */
 263static void
 264filelayout_set_layoutcommit(struct nfs_write_data *wdata)
 265{
 266        struct nfs_pgio_header *hdr = wdata->header;
 267
 268        if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
 269            wdata->res.verf->committed == NFS_FILE_SYNC)
 270                return;
 271
 272        pnfs_set_layoutcommit(wdata);
 273        dprintk("%s ionde %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
 274                (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
 275}
 276
 277bool
 278filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node)
 279{
 280        return filelayout_test_devid_invalid(node) ||
 281                nfs4_test_deviceid_unavailable(node);
 282}
 283
 284static bool
 285filelayout_reset_to_mds(struct pnfs_layout_segment *lseg)
 286{
 287        struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg);
 288
 289        return filelayout_test_devid_unavailable(node);
 290}
 291
 292/*
 293 * Call ops for the async read/write cases
 294 * In the case of dense layouts, the offset needs to be reset to its
 295 * original value.
 296 */
 297static void filelayout_read_prepare(struct rpc_task *task, void *data)
 298{
 299        struct nfs_read_data *rdata = data;
 300
 301        if (filelayout_reset_to_mds(rdata->header->lseg)) {
 302                dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
 303                filelayout_reset_read(rdata);
 304                rpc_exit(task, 0);
 305                return;
 306        }
 307        rdata->read_done_cb = filelayout_read_done_cb;
 308
 309        if (nfs41_setup_sequence(rdata->ds_clp->cl_session,
 310                                &rdata->args.seq_args, &rdata->res.seq_res,
 311                                task))
 312                return;
 313
 314        rpc_call_start(task);
 315}
 316
 317static void filelayout_read_call_done(struct rpc_task *task, void *data)
 318{
 319        struct nfs_read_data *rdata = data;
 320
 321        dprintk("--> %s task->tk_status %d\n", __func__, task->tk_status);
 322
 323        if (test_bit(NFS_IOHDR_REDO, &rdata->header->flags) &&
 324            task->tk_status == 0)
 325                return;
 326
 327        /* Note this may cause RPC to be resent */
 328        rdata->header->mds_ops->rpc_call_done(task, data);
 329}
 330
 331static void filelayout_read_count_stats(struct rpc_task *task, void *data)
 332{
 333        struct nfs_read_data *rdata = data;
 334
 335        rpc_count_iostats(task, NFS_SERVER(rdata->header->inode)->client->cl_metrics);
 336}
 337
 338static void filelayout_read_release(void *data)
 339{
 340        struct nfs_read_data *rdata = data;
 341        struct pnfs_layout_hdr *lo = rdata->header->lseg->pls_layout;
 342
 343        filelayout_fenceme(lo->plh_inode, lo);
 344        nfs_put_client(rdata->ds_clp);
 345        rdata->header->mds_ops->rpc_release(data);
 346}
 347
 348static int filelayout_write_done_cb(struct rpc_task *task,
 349                                struct nfs_write_data *data)
 350{
 351        struct nfs_pgio_header *hdr = data->header;
 352        int err;
 353
 354        err = filelayout_async_handle_error(task, data->args.context->state,
 355                                            data->ds_clp, hdr->lseg);
 356
 357        switch (err) {
 358        case -NFS4ERR_RESET_TO_MDS:
 359                filelayout_reset_write(data);
 360                return task->tk_status;
 361        case -EAGAIN:
 362                rpc_restart_call_prepare(task);
 363                return -EAGAIN;
 364        }
 365
 366        filelayout_set_layoutcommit(data);
 367        return 0;
 368}
 369
 370/* Fake up some data that will cause nfs_commit_release to retry the writes. */
 371static void prepare_to_resend_writes(struct nfs_commit_data *data)
 372{
 373        struct nfs_page *first = nfs_list_entry(data->pages.next);
 374
 375        data->task.tk_status = 0;
 376        memcpy(&data->verf.verifier, &first->wb_verf,
 377               sizeof(data->verf.verifier));
 378        data->verf.verifier.data[0]++; /* ensure verifier mismatch */
 379}
 380
 381static int filelayout_commit_done_cb(struct rpc_task *task,
 382                                     struct nfs_commit_data *data)
 383{
 384        int err;
 385
 386        err = filelayout_async_handle_error(task, NULL, data->ds_clp,
 387                                            data->lseg);
 388
 389        switch (err) {
 390        case -NFS4ERR_RESET_TO_MDS:
 391                prepare_to_resend_writes(data);
 392                return -EAGAIN;
 393        case -EAGAIN:
 394                rpc_restart_call_prepare(task);
 395                return -EAGAIN;
 396        }
 397
 398        return 0;
 399}
 400
 401static void filelayout_write_prepare(struct rpc_task *task, void *data)
 402{
 403        struct nfs_write_data *wdata = data;
 404
 405        if (filelayout_reset_to_mds(wdata->header->lseg)) {
 406                dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid);
 407                filelayout_reset_write(wdata);
 408                rpc_exit(task, 0);
 409                return;
 410        }
 411        if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
 412                                &wdata->args.seq_args, &wdata->res.seq_res,
 413                                task))
 414                return;
 415
 416        rpc_call_start(task);
 417}
 418
 419static void filelayout_write_call_done(struct rpc_task *task, void *data)
 420{
 421        struct nfs_write_data *wdata = data;
 422
 423        if (test_bit(NFS_IOHDR_REDO, &wdata->header->flags) &&
 424            task->tk_status == 0)
 425                return;
 426
 427        /* Note this may cause RPC to be resent */
 428        wdata->header->mds_ops->rpc_call_done(task, data);
 429}
 430
 431static void filelayout_write_count_stats(struct rpc_task *task, void *data)
 432{
 433        struct nfs_write_data *wdata = data;
 434
 435        rpc_count_iostats(task, NFS_SERVER(wdata->header->inode)->client->cl_metrics);
 436}
 437
 438static void filelayout_write_release(void *data)
 439{
 440        struct nfs_write_data *wdata = data;
 441        struct pnfs_layout_hdr *lo = wdata->header->lseg->pls_layout;
 442
 443        filelayout_fenceme(lo->plh_inode, lo);
 444        nfs_put_client(wdata->ds_clp);
 445        wdata->header->mds_ops->rpc_release(data);
 446}
 447
 448static void filelayout_commit_prepare(struct rpc_task *task, void *data)
 449{
 450        struct nfs_commit_data *wdata = data;
 451
 452        if (nfs41_setup_sequence(wdata->ds_clp->cl_session,
 453                                &wdata->args.seq_args, &wdata->res.seq_res,
 454                                task))
 455                return;
 456
 457        rpc_call_start(task);
 458}
 459
 460static void filelayout_write_commit_done(struct rpc_task *task, void *data)
 461{
 462        struct nfs_commit_data *wdata = data;
 463
 464        /* Note this may cause RPC to be resent */
 465        wdata->mds_ops->rpc_call_done(task, data);
 466}
 467
 468static void filelayout_commit_count_stats(struct rpc_task *task, void *data)
 469{
 470        struct nfs_commit_data *cdata = data;
 471
 472        rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics);
 473}
 474
 475static void filelayout_commit_release(void *calldata)
 476{
 477        struct nfs_commit_data *data = calldata;
 478
 479        data->completion_ops->completion(data);
 480        pnfs_put_lseg(data->lseg);
 481        nfs_put_client(data->ds_clp);
 482        nfs_commitdata_release(data);
 483}
 484
 485static const struct rpc_call_ops filelayout_read_call_ops = {
 486        .rpc_call_prepare = filelayout_read_prepare,
 487        .rpc_call_done = filelayout_read_call_done,
 488        .rpc_count_stats = filelayout_read_count_stats,
 489        .rpc_release = filelayout_read_release,
 490};
 491
 492static const struct rpc_call_ops filelayout_write_call_ops = {
 493        .rpc_call_prepare = filelayout_write_prepare,
 494        .rpc_call_done = filelayout_write_call_done,
 495        .rpc_count_stats = filelayout_write_count_stats,
 496        .rpc_release = filelayout_write_release,
 497};
 498
 499static const struct rpc_call_ops filelayout_commit_call_ops = {
 500        .rpc_call_prepare = filelayout_commit_prepare,
 501        .rpc_call_done = filelayout_write_commit_done,
 502        .rpc_count_stats = filelayout_commit_count_stats,
 503        .rpc_release = filelayout_commit_release,
 504};
 505
 506static enum pnfs_try_status
 507filelayout_read_pagelist(struct nfs_read_data *data)
 508{
 509        struct nfs_pgio_header *hdr = data->header;
 510        struct pnfs_layout_segment *lseg = hdr->lseg;
 511        struct nfs4_pnfs_ds *ds;
 512        loff_t offset = data->args.offset;
 513        u32 j, idx;
 514        struct nfs_fh *fh;
 515        int status;
 516
 517        dprintk("--> %s ino %lu pgbase %u req %Zu@%llu\n",
 518                __func__, hdr->inode->i_ino,
 519                data->args.pgbase, (size_t)data->args.count, offset);
 520
 521        /* Retrieve the correct rpc_client for the byte range */
 522        j = nfs4_fl_calc_j_index(lseg, offset);
 523        idx = nfs4_fl_calc_ds_index(lseg, j);
 524        ds = nfs4_fl_prepare_ds(lseg, idx);
 525        if (!ds)
 526                return PNFS_NOT_ATTEMPTED;
 527        dprintk("%s USE DS: %s cl_count %d\n", __func__,
 528                ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
 529
 530        /* No multipath support. Use first DS */
 531        atomic_inc(&ds->ds_clp->cl_count);
 532        data->ds_clp = ds->ds_clp;
 533        fh = nfs4_fl_select_ds_fh(lseg, j);
 534        if (fh)
 535                data->args.fh = fh;
 536
 537        data->args.offset = filelayout_get_dserver_offset(lseg, offset);
 538        data->mds_offset = offset;
 539
 540        /* Perform an asynchronous read to ds */
 541        status = nfs_initiate_read(ds->ds_clp->cl_rpcclient, data,
 542                                  &filelayout_read_call_ops, RPC_TASK_SOFTCONN);
 543        BUG_ON(status != 0);
 544        return PNFS_ATTEMPTED;
 545}
 546
 547/* Perform async writes. */
 548static enum pnfs_try_status
 549filelayout_write_pagelist(struct nfs_write_data *data, int sync)
 550{
 551        struct nfs_pgio_header *hdr = data->header;
 552        struct pnfs_layout_segment *lseg = hdr->lseg;
 553        struct nfs4_pnfs_ds *ds;
 554        loff_t offset = data->args.offset;
 555        u32 j, idx;
 556        struct nfs_fh *fh;
 557        int status;
 558
 559        /* Retrieve the correct rpc_client for the byte range */
 560        j = nfs4_fl_calc_j_index(lseg, offset);
 561        idx = nfs4_fl_calc_ds_index(lseg, j);
 562        ds = nfs4_fl_prepare_ds(lseg, idx);
 563        if (!ds)
 564                return PNFS_NOT_ATTEMPTED;
 565        dprintk("%s ino %lu sync %d req %Zu@%llu DS: %s cl_count %d\n",
 566                __func__, hdr->inode->i_ino, sync, (size_t) data->args.count,
 567                offset, ds->ds_remotestr, atomic_read(&ds->ds_clp->cl_count));
 568
 569        data->write_done_cb = filelayout_write_done_cb;
 570        atomic_inc(&ds->ds_clp->cl_count);
 571        data->ds_clp = ds->ds_clp;
 572        fh = nfs4_fl_select_ds_fh(lseg, j);
 573        if (fh)
 574                data->args.fh = fh;
 575        /*
 576         * Get the file offset on the dserver. Set the write offset to
 577         * this offset and save the original offset.
 578         */
 579        data->args.offset = filelayout_get_dserver_offset(lseg, offset);
 580
 581        /* Perform an asynchronous write */
 582        status = nfs_initiate_write(ds->ds_clp->cl_rpcclient, data,
 583                                    &filelayout_write_call_ops, sync,
 584                                    RPC_TASK_SOFTCONN);
 585        BUG_ON(status != 0);
 586        return PNFS_ATTEMPTED;
 587}
 588
 589/*
 590 * filelayout_check_layout()
 591 *
 592 * Make sure layout segment parameters are sane WRT the device.
 593 * At this point no generic layer initialization of the lseg has occurred,
 594 * and nothing has been added to the layout_hdr cache.
 595 *
 596 */
 597static int
 598filelayout_check_layout(struct pnfs_layout_hdr *lo,
 599                        struct nfs4_filelayout_segment *fl,
 600                        struct nfs4_layoutget_res *lgr,
 601                        struct nfs4_deviceid *id,
 602                        gfp_t gfp_flags)
 603{
 604        struct nfs4_deviceid_node *d;
 605        struct nfs4_file_layout_dsaddr *dsaddr;
 606        int status = -EINVAL;
 607        struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
 608
 609        dprintk("--> %s\n", __func__);
 610
 611        /* FIXME: remove this check when layout segment support is added */
 612        if (lgr->range.offset != 0 ||
 613            lgr->range.length != NFS4_MAX_UINT64) {
 614                dprintk("%s Only whole file layouts supported. Use MDS i/o\n",
 615                        __func__);
 616                goto out;
 617        }
 618
 619        if (fl->pattern_offset > lgr->range.offset) {
 620                dprintk("%s pattern_offset %lld too large\n",
 621                                __func__, fl->pattern_offset);
 622                goto out;
 623        }
 624
 625        if (!fl->stripe_unit || fl->stripe_unit % PAGE_SIZE) {
 626                dprintk("%s Invalid stripe unit (%u)\n",
 627                        __func__, fl->stripe_unit);
 628                goto out;
 629        }
 630
 631        /* find and reference the deviceid */
 632        d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
 633                                   NFS_SERVER(lo->plh_inode)->nfs_client, id);
 634        if (d == NULL) {
 635                dsaddr = filelayout_get_device_info(lo->plh_inode, id, gfp_flags);
 636                if (dsaddr == NULL)
 637                        goto out;
 638        } else
 639                dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
 640        /* Found deviceid is unavailable */
 641        if (filelayout_test_devid_unavailable(&dsaddr->id_node))
 642                        goto out_put;
 643
 644        fl->dsaddr = dsaddr;
 645
 646        if (fl->first_stripe_index >= dsaddr->stripe_count) {
 647                dprintk("%s Bad first_stripe_index %u\n",
 648                                __func__, fl->first_stripe_index);
 649                goto out_put;
 650        }
 651
 652        if ((fl->stripe_type == STRIPE_SPARSE &&
 653            fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
 654            (fl->stripe_type == STRIPE_DENSE &&
 655            fl->num_fh != dsaddr->stripe_count)) {
 656                dprintk("%s num_fh %u not valid for given packing\n",
 657                        __func__, fl->num_fh);
 658                goto out_put;
 659        }
 660
 661        if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
 662                dprintk("%s Stripe unit (%u) not aligned with rsize %u "
 663                        "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
 664                        nfss->wsize);
 665        }
 666
 667        status = 0;
 668out:
 669        dprintk("--> %s returns %d\n", __func__, status);
 670        return status;
 671out_put:
 672        nfs4_fl_put_deviceid(dsaddr);
 673        goto out;
 674}
 675
 676static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
 677{
 678        int i;
 679
 680        for (i = 0; i < fl->num_fh; i++) {
 681                if (!fl->fh_array[i])
 682                        break;
 683                kfree(fl->fh_array[i]);
 684        }
 685        kfree(fl->fh_array);
 686        fl->fh_array = NULL;
 687}
 688
 689static void
 690_filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
 691{
 692        filelayout_free_fh_array(fl);
 693        kfree(fl);
 694}
 695
 696static int
 697filelayout_decode_layout(struct pnfs_layout_hdr *flo,
 698                         struct nfs4_filelayout_segment *fl,
 699                         struct nfs4_layoutget_res *lgr,
 700                         struct nfs4_deviceid *id,
 701                         gfp_t gfp_flags)
 702{
 703        struct xdr_stream stream;
 704        struct xdr_buf buf;
 705        struct page *scratch;
 706        __be32 *p;
 707        uint32_t nfl_util;
 708        int i;
 709
 710        dprintk("%s: set_layout_map Begin\n", __func__);
 711
 712        scratch = alloc_page(gfp_flags);
 713        if (!scratch)
 714                return -ENOMEM;
 715
 716        xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len);
 717        xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
 718
 719        /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8),
 720         * num_fh (4) */
 721        p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20);
 722        if (unlikely(!p))
 723                goto out_err;
 724
 725        memcpy(id, p, sizeof(*id));
 726        p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
 727        nfs4_print_deviceid(id);
 728
 729        nfl_util = be32_to_cpup(p++);
 730        if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
 731                fl->commit_through_mds = 1;
 732        if (nfl_util & NFL4_UFLG_DENSE)
 733                fl->stripe_type = STRIPE_DENSE;
 734        else
 735                fl->stripe_type = STRIPE_SPARSE;
 736        fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
 737
 738        fl->first_stripe_index = be32_to_cpup(p++);
 739        p = xdr_decode_hyper(p, &fl->pattern_offset);
 740        fl->num_fh = be32_to_cpup(p++);
 741
 742        dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
 743                __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
 744                fl->pattern_offset);
 745
 746        /* Note that a zero value for num_fh is legal for STRIPE_SPARSE.
 747         * Futher checking is done in filelayout_check_layout */
 748        if (fl->num_fh >
 749            max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT))
 750                goto out_err;
 751
 752        if (fl->num_fh > 0) {
 753                fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]),
 754                                       gfp_flags);
 755                if (!fl->fh_array)
 756                        goto out_err;
 757        }
 758
 759        for (i = 0; i < fl->num_fh; i++) {
 760                /* Do we want to use a mempool here? */
 761                fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags);
 762                if (!fl->fh_array[i])
 763                        goto out_err_free;
 764
 765                p = xdr_inline_decode(&stream, 4);
 766                if (unlikely(!p))
 767                        goto out_err_free;
 768                fl->fh_array[i]->size = be32_to_cpup(p++);
 769                if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
 770                        printk(KERN_ERR "NFS: Too big fh %d received %d\n",
 771                               i, fl->fh_array[i]->size);
 772                        goto out_err_free;
 773                }
 774
 775                p = xdr_inline_decode(&stream, fl->fh_array[i]->size);
 776                if (unlikely(!p))
 777                        goto out_err_free;
 778                memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
 779                dprintk("DEBUG: %s: fh len %d\n", __func__,
 780                        fl->fh_array[i]->size);
 781        }
 782
 783        __free_page(scratch);
 784        return 0;
 785
 786out_err_free:
 787        filelayout_free_fh_array(fl);
 788out_err:
 789        __free_page(scratch);
 790        return -EIO;
 791}
 792
 793static void
 794filelayout_free_lseg(struct pnfs_layout_segment *lseg)
 795{
 796        struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
 797
 798        dprintk("--> %s\n", __func__);
 799        nfs4_fl_put_deviceid(fl->dsaddr);
 800        /* This assumes a single RW lseg */
 801        if (lseg->pls_range.iomode == IOMODE_RW) {
 802                struct nfs4_filelayout *flo;
 803
 804                flo = FILELAYOUT_FROM_HDR(lseg->pls_layout);
 805                flo->commit_info.nbuckets = 0;
 806                kfree(flo->commit_info.buckets);
 807                flo->commit_info.buckets = NULL;
 808        }
 809        _filelayout_free_lseg(fl);
 810}
 811
 812static int
 813filelayout_alloc_commit_info(struct pnfs_layout_segment *lseg,
 814                             struct nfs_commit_info *cinfo,
 815                             gfp_t gfp_flags)
 816{
 817        struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
 818        struct pnfs_commit_bucket *buckets;
 819        int size;
 820
 821        if (fl->commit_through_mds)
 822                return 0;
 823        if (cinfo->ds->nbuckets != 0) {
 824                /* This assumes there is only one IOMODE_RW lseg.  What
 825                 * we really want to do is have a layout_hdr level
 826                 * dictionary of <multipath_list4, fh> keys, each
 827                 * associated with a struct list_head, populated by calls
 828                 * to filelayout_write_pagelist().
 829                 * */
 830                return 0;
 831        }
 832
 833        size = (fl->stripe_type == STRIPE_SPARSE) ?
 834                fl->dsaddr->ds_num : fl->dsaddr->stripe_count;
 835
 836        buckets = kcalloc(size, sizeof(struct pnfs_commit_bucket),
 837                          gfp_flags);
 838        if (!buckets)
 839                return -ENOMEM;
 840        else {
 841                int i;
 842
 843                spin_lock(cinfo->lock);
 844                if (cinfo->ds->nbuckets != 0)
 845                        kfree(buckets);
 846                else {
 847                        cinfo->ds->buckets = buckets;
 848                        cinfo->ds->nbuckets = size;
 849                        for (i = 0; i < size; i++) {
 850                                INIT_LIST_HEAD(&buckets[i].written);
 851                                INIT_LIST_HEAD(&buckets[i].committing);
 852                        }
 853                }
 854                spin_unlock(cinfo->lock);
 855                return 0;
 856        }
 857}
 858
 859static struct pnfs_layout_segment *
 860filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
 861                      struct nfs4_layoutget_res *lgr,
 862                      gfp_t gfp_flags)
 863{
 864        struct nfs4_filelayout_segment *fl;
 865        int rc;
 866        struct nfs4_deviceid id;
 867
 868        dprintk("--> %s\n", __func__);
 869        fl = kzalloc(sizeof(*fl), gfp_flags);
 870        if (!fl)
 871                return NULL;
 872
 873        rc = filelayout_decode_layout(layoutid, fl, lgr, &id, gfp_flags);
 874        if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id, gfp_flags)) {
 875                _filelayout_free_lseg(fl);
 876                return NULL;
 877        }
 878        return &fl->generic_hdr;
 879}
 880
 881/*
 882 * filelayout_pg_test(). Called by nfs_can_coalesce_requests()
 883 *
 884 * return true  : coalesce page
 885 * return false : don't coalesce page
 886 */
 887static bool
 888filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
 889                   struct nfs_page *req)
 890{
 891        u64 p_stripe, r_stripe;
 892        u32 stripe_unit;
 893
 894        if (!pnfs_generic_pg_test(pgio, prev, req) ||
 895            !nfs_generic_pg_test(pgio, prev, req))
 896                return false;
 897
 898        p_stripe = (u64)req_offset(prev);
 899        r_stripe = (u64)req_offset(req);
 900        stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit;
 901
 902        do_div(p_stripe, stripe_unit);
 903        do_div(r_stripe, stripe_unit);
 904
 905        return (p_stripe == r_stripe);
 906}
 907
 908static void
 909filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
 910                        struct nfs_page *req)
 911{
 912        BUG_ON(pgio->pg_lseg != NULL);
 913
 914        if (req->wb_offset != req->wb_pgbase) {
 915                /*
 916                 * Handling unaligned pages is difficult, because have to
 917                 * somehow split a req in two in certain cases in the
 918                 * pg.test code.  Avoid this by just not using pnfs
 919                 * in this case.
 920                 */
 921                nfs_pageio_reset_read_mds(pgio);
 922                return;
 923        }
 924        pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 925                                           req->wb_context,
 926                                           0,
 927                                           NFS4_MAX_UINT64,
 928                                           IOMODE_READ,
 929                                           GFP_KERNEL);
 930        /* If no lseg, fall back to read through mds */
 931        if (pgio->pg_lseg == NULL)
 932                nfs_pageio_reset_read_mds(pgio);
 933}
 934
 935static void
 936filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
 937                         struct nfs_page *req)
 938{
 939        struct nfs_commit_info cinfo;
 940        int status;
 941
 942        BUG_ON(pgio->pg_lseg != NULL);
 943
 944        if (req->wb_offset != req->wb_pgbase)
 945                goto out_mds;
 946        pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
 947                                           req->wb_context,
 948                                           0,
 949                                           NFS4_MAX_UINT64,
 950                                           IOMODE_RW,
 951                                           GFP_NOFS);
 952        /* If no lseg, fall back to write through mds */
 953        if (pgio->pg_lseg == NULL)
 954                goto out_mds;
 955        nfs_init_cinfo(&cinfo, pgio->pg_inode, pgio->pg_dreq);
 956        status = filelayout_alloc_commit_info(pgio->pg_lseg, &cinfo, GFP_NOFS);
 957        if (status < 0) {
 958                pnfs_put_lseg(pgio->pg_lseg);
 959                pgio->pg_lseg = NULL;
 960                goto out_mds;
 961        }
 962        return;
 963out_mds:
 964        nfs_pageio_reset_write_mds(pgio);
 965}
 966
 967static const struct nfs_pageio_ops filelayout_pg_read_ops = {
 968        .pg_init = filelayout_pg_init_read,
 969        .pg_test = filelayout_pg_test,
 970        .pg_doio = pnfs_generic_pg_readpages,
 971};
 972
 973static const struct nfs_pageio_ops filelayout_pg_write_ops = {
 974        .pg_init = filelayout_pg_init_write,
 975        .pg_test = filelayout_pg_test,
 976        .pg_doio = pnfs_generic_pg_writepages,
 977};
 978
 979static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j)
 980{
 981        if (fl->stripe_type == STRIPE_SPARSE)
 982                return nfs4_fl_calc_ds_index(&fl->generic_hdr, j);
 983        else
 984                return j;
 985}
 986
 987/* The generic layer is about to remove the req from the commit list.
 988 * If this will make the bucket empty, it will need to put the lseg reference.
 989 */
 990static void
 991filelayout_clear_request_commit(struct nfs_page *req,
 992                                struct nfs_commit_info *cinfo)
 993{
 994        struct pnfs_layout_segment *freeme = NULL;
 995
 996        spin_lock(cinfo->lock);
 997        if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
 998                goto out;
 999        cinfo->ds->nwritten--;
1000        if (list_is_singular(&req->wb_list)) {
1001                struct pnfs_commit_bucket *bucket;
1002
1003                bucket = list_first_entry(&req->wb_list,
1004                                          struct pnfs_commit_bucket,
1005                                          written);
1006                freeme = bucket->wlseg;
1007                bucket->wlseg = NULL;
1008        }
1009out:
1010        nfs_request_remove_commit_list(req, cinfo);
1011        spin_unlock(cinfo->lock);
1012        pnfs_put_lseg(freeme);
1013}
1014
1015static struct list_head *
1016filelayout_choose_commit_list(struct nfs_page *req,
1017                              struct pnfs_layout_segment *lseg,
1018                              struct nfs_commit_info *cinfo)
1019{
1020        struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
1021        u32 i, j;
1022        struct list_head *list;
1023        struct pnfs_commit_bucket *buckets;
1024
1025        if (fl->commit_through_mds)
1026                return &cinfo->mds->list;
1027
1028        /* Note that we are calling nfs4_fl_calc_j_index on each page
1029         * that ends up being committed to a data server.  An attractive
1030         * alternative is to add a field to nfs_write_data and nfs_page
1031         * to store the value calculated in filelayout_write_pagelist
1032         * and just use that here.
1033         */
1034        j = nfs4_fl_calc_j_index(lseg, req_offset(req));
1035        i = select_bucket_index(fl, j);
1036        buckets = cinfo->ds->buckets;
1037        list = &buckets[i].written;
1038        if (list_empty(list)) {
1039                /* Non-empty buckets hold a reference on the lseg.  That ref
1040                 * is normally transferred to the COMMIT call and released
1041                 * there.  It could also be released if the last req is pulled
1042                 * off due to a rewrite, in which case it will be done in
1043                 * filelayout_clear_request_commit
1044                 */
1045                buckets[i].wlseg = pnfs_get_lseg(lseg);
1046        }
1047        set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1048        cinfo->ds->nwritten++;
1049        return list;
1050}
1051
1052static void
1053filelayout_mark_request_commit(struct nfs_page *req,
1054                               struct pnfs_layout_segment *lseg,
1055                               struct nfs_commit_info *cinfo)
1056{
1057        struct list_head *list;
1058
1059        list = filelayout_choose_commit_list(req, lseg, cinfo);
1060        nfs_request_add_commit_list(req, list, cinfo);
1061}
1062
1063static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1064{
1065        struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1066
1067        if (flseg->stripe_type == STRIPE_SPARSE)
1068                return i;
1069        else
1070                return nfs4_fl_calc_ds_index(lseg, i);
1071}
1072
1073static struct nfs_fh *
1074select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i)
1075{
1076        struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg);
1077
1078        if (flseg->stripe_type == STRIPE_SPARSE) {
1079                if (flseg->num_fh == 1)
1080                        i = 0;
1081                else if (flseg->num_fh == 0)
1082                        /* Use the MDS OPEN fh set in nfs_read_rpcsetup */
1083                        return NULL;
1084        }
1085        return flseg->fh_array[i];
1086}
1087
1088static int filelayout_initiate_commit(struct nfs_commit_data *data, int how)
1089{
1090        struct pnfs_layout_segment *lseg = data->lseg;
1091        struct nfs4_pnfs_ds *ds;
1092        u32 idx;
1093        struct nfs_fh *fh;
1094
1095        idx = calc_ds_index_from_commit(lseg, data->ds_commit_index);
1096        ds = nfs4_fl_prepare_ds(lseg, idx);
1097        if (!ds) {
1098                prepare_to_resend_writes(data);
1099                filelayout_commit_release(data);
1100                return -EAGAIN;
1101        }
1102        dprintk("%s ino %lu, how %d cl_count %d\n", __func__,
1103                data->inode->i_ino, how, atomic_read(&ds->ds_clp->cl_count));
1104        data->commit_done_cb = filelayout_commit_done_cb;
1105        atomic_inc(&ds->ds_clp->cl_count);
1106        data->ds_clp = ds->ds_clp;
1107        fh = select_ds_fh_from_commit(lseg, data->ds_commit_index);
1108        if (fh)
1109                data->args.fh = fh;
1110        return nfs_initiate_commit(ds->ds_clp->cl_rpcclient, data,
1111                                   &filelayout_commit_call_ops, how,
1112                                   RPC_TASK_SOFTCONN);
1113}
1114
1115static int
1116transfer_commit_list(struct list_head *src, struct list_head *dst,
1117                     struct nfs_commit_info *cinfo, int max)
1118{
1119        struct nfs_page *req, *tmp;
1120        int ret = 0;
1121
1122        list_for_each_entry_safe(req, tmp, src, wb_list) {
1123                if (!nfs_lock_request(req))
1124                        continue;
1125                kref_get(&req->wb_kref);
1126                if (cond_resched_lock(cinfo->lock))
1127                        list_safe_reset_next(req, tmp, wb_list);
1128                nfs_request_remove_commit_list(req, cinfo);
1129                clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1130                nfs_list_add_request(req, dst);
1131                ret++;
1132                if ((ret == max) && !cinfo->dreq)
1133                        break;
1134        }
1135        return ret;
1136}
1137
1138static int
1139filelayout_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
1140                               struct nfs_commit_info *cinfo,
1141                               int max)
1142{
1143        struct list_head *src = &bucket->written;
1144        struct list_head *dst = &bucket->committing;
1145        int ret;
1146
1147        ret = transfer_commit_list(src, dst, cinfo, max);
1148        if (ret) {
1149                cinfo->ds->nwritten -= ret;
1150                cinfo->ds->ncommitting += ret;
1151                bucket->clseg = bucket->wlseg;
1152                if (list_empty(src))
1153                        bucket->wlseg = NULL;
1154                else
1155                        pnfs_get_lseg(bucket->clseg);
1156        }
1157        return ret;
1158}
1159
1160/* Move reqs from written to committing lists, returning count of number moved.
1161 * Note called with cinfo->lock held.
1162 */
1163static int filelayout_scan_commit_lists(struct nfs_commit_info *cinfo,
1164                                        int max)
1165{
1166        int i, rv = 0, cnt;
1167
1168        for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
1169                cnt = filelayout_scan_ds_commit_list(&cinfo->ds->buckets[i],
1170                                                     cinfo, max);
1171                max -= cnt;
1172                rv += cnt;
1173        }
1174        return rv;
1175}
1176
1177/* Pull everything off the committing lists and dump into @dst */
1178static void filelayout_recover_commit_reqs(struct list_head *dst,
1179                                           struct nfs_commit_info *cinfo)
1180{
1181        struct pnfs_commit_bucket *b;
1182        int i;
1183
1184        /* NOTE cinfo->lock is NOT held, relying on fact that this is
1185         * only called on single thread per dreq.
1186         * Can't take the lock because need to do pnfs_put_lseg
1187         */
1188        for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
1189                if (transfer_commit_list(&b->written, dst, cinfo, 0)) {
1190                        BUG_ON(!list_empty(&b->written));
1191                        pnfs_put_lseg(b->wlseg);
1192                        b->wlseg = NULL;
1193                }
1194        }
1195        cinfo->ds->nwritten = 0;
1196}
1197
1198static unsigned int
1199alloc_ds_commits(struct nfs_commit_info *cinfo, struct list_head *list)
1200{
1201        struct pnfs_ds_commit_info *fl_cinfo;
1202        struct pnfs_commit_bucket *bucket;
1203        struct nfs_commit_data *data;
1204        int i, j;
1205        unsigned int nreq = 0;
1206
1207        fl_cinfo = cinfo->ds;
1208        bucket = fl_cinfo->buckets;
1209        for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
1210                if (list_empty(&bucket->committing))
1211                        continue;
1212                data = nfs_commitdata_alloc();
1213                if (!data)
1214                        break;
1215                data->ds_commit_index = i;
1216                data->lseg = bucket->clseg;
1217                bucket->clseg = NULL;
1218                list_add(&data->pages, list);
1219                nreq++;
1220        }
1221
1222        /* Clean up on error */
1223        for (j = i; j < fl_cinfo->nbuckets; j++, bucket++) {
1224                if (list_empty(&bucket->committing))
1225                        continue;
1226                nfs_retry_commit(&bucket->committing, bucket->clseg, cinfo);
1227                pnfs_put_lseg(bucket->clseg);
1228                bucket->clseg = NULL;
1229        }
1230        /* Caller will clean up entries put on list */
1231        return nreq;
1232}
1233
1234/* This follows nfs_commit_list pretty closely */
1235static int
1236filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
1237                           int how, struct nfs_commit_info *cinfo)
1238{
1239        struct nfs_commit_data *data, *tmp;
1240        LIST_HEAD(list);
1241        unsigned int nreq = 0;
1242
1243        if (!list_empty(mds_pages)) {
1244                data = nfs_commitdata_alloc();
1245                if (data != NULL) {
1246                        data->lseg = NULL;
1247                        list_add(&data->pages, &list);
1248                        nreq++;
1249                } else
1250                        nfs_retry_commit(mds_pages, NULL, cinfo);
1251        }
1252
1253        nreq += alloc_ds_commits(cinfo, &list);
1254
1255        if (nreq == 0) {
1256                cinfo->completion_ops->error_cleanup(NFS_I(inode));
1257                goto out;
1258        }
1259
1260        atomic_add(nreq, &cinfo->mds->rpcs_out);
1261
1262        list_for_each_entry_safe(data, tmp, &list, pages) {
1263                list_del_init(&data->pages);
1264                if (!data->lseg) {
1265                        nfs_init_commit(data, mds_pages, NULL, cinfo);
1266                        nfs_initiate_commit(NFS_CLIENT(inode), data,
1267                                            data->mds_ops, how, 0);
1268                } else {
1269                        struct pnfs_commit_bucket *buckets;
1270
1271                        buckets = cinfo->ds->buckets;
1272                        nfs_init_commit(data, &buckets[data->ds_commit_index].committing, data->lseg, cinfo);
1273                        filelayout_initiate_commit(data, how);
1274                }
1275        }
1276out:
1277        cinfo->ds->ncommitting = 0;
1278        return PNFS_ATTEMPTED;
1279}
1280
1281static void
1282filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
1283{
1284        nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node));
1285}
1286
1287static struct pnfs_layout_hdr *
1288filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags)
1289{
1290        struct nfs4_filelayout *flo;
1291
1292        flo = kzalloc(sizeof(*flo), gfp_flags);
1293        return &flo->generic_hdr;
1294}
1295
1296static void
1297filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo)
1298{
1299        kfree(FILELAYOUT_FROM_HDR(lo));
1300}
1301
1302static struct pnfs_ds_commit_info *
1303filelayout_get_ds_info(struct inode *inode)
1304{
1305        struct pnfs_layout_hdr *layout = NFS_I(inode)->layout;
1306
1307        if (layout == NULL)
1308                return NULL;
1309        else
1310                return &FILELAYOUT_FROM_HDR(layout)->commit_info;
1311}
1312
1313static struct pnfs_layoutdriver_type filelayout_type = {
1314        .id                     = LAYOUT_NFSV4_1_FILES,
1315        .name                   = "LAYOUT_NFSV4_1_FILES",
1316        .owner                  = THIS_MODULE,
1317        .alloc_layout_hdr       = filelayout_alloc_layout_hdr,
1318        .free_layout_hdr        = filelayout_free_layout_hdr,
1319        .alloc_lseg             = filelayout_alloc_lseg,
1320        .free_lseg              = filelayout_free_lseg,
1321        .pg_read_ops            = &filelayout_pg_read_ops,
1322        .pg_write_ops           = &filelayout_pg_write_ops,
1323        .get_ds_info            = &filelayout_get_ds_info,
1324        .mark_request_commit    = filelayout_mark_request_commit,
1325        .clear_request_commit   = filelayout_clear_request_commit,
1326        .scan_commit_lists      = filelayout_scan_commit_lists,
1327        .recover_commit_reqs    = filelayout_recover_commit_reqs,
1328        .commit_pagelist        = filelayout_commit_pagelist,
1329        .read_pagelist          = filelayout_read_pagelist,
1330        .write_pagelist         = filelayout_write_pagelist,
1331        .free_deviceid_node     = filelayout_free_deveiceid_node,
1332};
1333
1334static int __init nfs4filelayout_init(void)
1335{
1336        printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
1337               __func__);
1338        return pnfs_register_layoutdriver(&filelayout_type);
1339}
1340
1341static void __exit nfs4filelayout_exit(void)
1342{
1343        printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
1344               __func__);
1345        pnfs_unregister_layoutdriver(&filelayout_type);
1346}
1347
1348MODULE_ALIAS("nfs-layouttype4-1");
1349
1350module_init(nfs4filelayout_init);
1351module_exit(nfs4filelayout_exit);
1352
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