fs/nfs/nfs42proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
   4  */
   5 #include <linux/fs.h>
   6 #include <linux/sunrpc/sched.h>
   7 #include <linux/nfs.h>
   8 #include <linux/nfs3.h>
   9 #include <linux/nfs4.h>
  10 #include <linux/nfs_xdr.h>
  11 #include <linux/nfs_fs.h>
  12 #include "nfs4_fs.h"
  13 #include "nfs42.h"
  14 #include "iostat.h"
  15 #include "pnfs.h"
  16 #include "nfs4session.h"
  17 #include "internal.h"
  18
  19 #define NFSDBG_FACILITY NFSDBG_PROC
  20 static int nfs42_do_offload_cancel_async(struct file *dst, nfs4_stateid *std);
  21
  22 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  23                 struct nfs_lock_context *lock, loff_t offset, loff_t len)
  24 {
  25         struct inode *inode = file_inode(filep);
  26         struct nfs_server *server = NFS_SERVER(inode);
  27         struct nfs42_falloc_args args = {
  28                 .falloc_fh      = NFS_FH(inode),
  29                 .falloc_offset  = offset,
  30                 .falloc_length  = len,
  31                 .falloc_bitmask = server->cache_consistency_bitmask,
  32         };
  33         struct nfs42_falloc_res res = {
  34                 .falloc_server  = server,
  35         };
  36         int status;
  37
  38         msg->rpc_argp = &args;
  39         msg->rpc_resp = &res;
  40
  41         status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
  42                         lock, FMODE_WRITE);
  43         if (status)
  44                 return status;
  45
  46         res.falloc_fattr = nfs_alloc_fattr();
  47         if (!res.falloc_fattr)
  48                 return -ENOMEM;
  49
  50         status = nfs4_call_sync(server->client, server, msg,
  51                                 &args.seq_args, &res.seq_res, 0);
  52         if (status == 0)
  53                 status = nfs_post_op_update_inode(inode, res.falloc_fattr);
  54
  55         kfree(res.falloc_fattr);
  56         return status;
  57 }
  58
  59 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  60                                 loff_t offset, loff_t len)
  61 {
  62         struct nfs_server *server = NFS_SERVER(file_inode(filep));
  63         struct nfs4_exception exception = { };
  64         struct nfs_lock_context *lock;
  65         int err;
  66
  67         lock = nfs_get_lock_context(nfs_file_open_context(filep));
  68         if (IS_ERR(lock))
  69                 return PTR_ERR(lock);
  70
  71         exception.inode = file_inode(filep);
  72         exception.state = lock->open_context->state;
  73
  74         do {
  75                 err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
  76                 if (err == -ENOTSUPP) {
  77                         err = -EOPNOTSUPP;
  78                         break;
  79                 }
  80                 err = nfs4_handle_exception(server, err, &exception);
  81         } while (exception.retry);
  82
  83         nfs_put_lock_context(lock);
  84         return err;
  85 }
  86
  87 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
  88 {
  89         struct rpc_message msg = {
  90                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
  91         };
  92         struct inode *inode = file_inode(filep);
  93         int err;
  94
  95         if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
  96                 return -EOPNOTSUPP;
  97
  98         inode_lock(inode);
  99
 100         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 101         if (err == -EOPNOTSUPP)
 102                 NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
 103
 104         inode_unlock(inode);
 105         return err;
 106 }
 107
 108 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
 109 {
 110         struct rpc_message msg = {
 111                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
 112         };
 113         struct inode *inode = file_inode(filep);
 114         int err;
 115
 116         if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
 117                 return -EOPNOTSUPP;
 118
 119         inode_lock(inode);
 120         err = nfs_sync_inode(inode);
 121         if (err)
 122                 goto out_unlock;
 123
 124         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 125         if (err == 0)
 126                 truncate_pagecache_range(inode, offset, (offset + len) -1);
 127         if (err == -EOPNOTSUPP)
 128                 NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
 129 out_unlock:
 130         inode_unlock(inode);
 131         return err;
 132 }
 133
 134 static int handle_async_copy(struct nfs42_copy_res *res,
 135                              struct nfs_server *server,
 136                              struct file *src,
 137                              struct file *dst,
 138                              nfs4_stateid *src_stateid)
 139 {
 140         struct nfs4_copy_state *copy, *tmp_copy;
 141         int status = NFS4_OK;
 142         bool found_pending = false;
 143         struct nfs_open_context *ctx = nfs_file_open_context(dst);
 144
 145         copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
 146         if (!copy)
 147                 return -ENOMEM;
 148
 149         spin_lock(&server->nfs_client->cl_lock);
 150         list_for_each_entry(tmp_copy, &server->nfs_client->pending_cb_stateids,
 151                                 copies) {
 152                 if (memcmp(&res->write_res.stateid, &tmp_copy->stateid,
 153                                 NFS4_STATEID_SIZE))
 154                         continue;
 155                 found_pending = true;
 156                 list_del(&tmp_copy->copies);
 157                 break;
 158         }
 159         if (found_pending) {
 160                 spin_unlock(&server->nfs_client->cl_lock);
 161                 kfree(copy);
 162                 copy = tmp_copy;
 163                 goto out;
 164         }
 165
 166         memcpy(&copy->stateid, &res->write_res.stateid, NFS4_STATEID_SIZE);
 167         init_completion(&copy->completion);
 168         copy->parent_state = ctx->state;
 169
 170         list_add_tail(&copy->copies, &server->ss_copies);
 171         spin_unlock(&server->nfs_client->cl_lock);
 172
 173         status = wait_for_completion_interruptible(&copy->completion);
 174         spin_lock(&server->nfs_client->cl_lock);
 175         list_del_init(&copy->copies);
 176         spin_unlock(&server->nfs_client->cl_lock);
 177         if (status == -ERESTARTSYS) {
 178                 goto out_cancel;
 179         } else if (copy->flags) {
 180                 status = -EAGAIN;
 181                 goto out_cancel;
 182         }
 183 out:
 184         res->write_res.count = copy->count;
 185         memcpy(&res->write_res.verifier, &copy->verf, sizeof(copy->verf));
 186         status = -copy->error;
 187
 188         kfree(copy);
 189         return status;
 190 out_cancel:
 191         nfs42_do_offload_cancel_async(dst, &copy->stateid);
 192         kfree(copy);
 193         return status;
 194 }
 195
 196 static int process_copy_commit(struct file *dst, loff_t pos_dst,
 197                                struct nfs42_copy_res *res)
 198 {
 199         struct nfs_commitres cres;
 200         int status = -ENOMEM;
 201
 202         cres.verf = kzalloc(sizeof(struct nfs_writeverf), GFP_NOFS);
 203         if (!cres.verf)
 204                 goto out;
 205
 206         status = nfs4_proc_commit(dst, pos_dst, res->write_res.count, &cres);
 207         if (status)
 208                 goto out_free;
 209         if (nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
 210                                     &cres.verf->verifier)) {
 211                 dprintk("commit verf differs from copy verf\n");
 212                 status = -EAGAIN;
 213         }
 214 out_free:
 215         kfree(cres.verf);
 216 out:
 217         return status;
 218 }
 219
 220 static ssize_t _nfs42_proc_copy(struct file *src,
 221                                 struct nfs_lock_context *src_lock,
 222                                 struct file *dst,
 223                                 struct nfs_lock_context *dst_lock,
 224                                 struct nfs42_copy_args *args,
 225                                 struct nfs42_copy_res *res)
 226 {
 227         struct rpc_message msg = {
 228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
 229                 .rpc_argp = args,
 230                 .rpc_resp = res,
 231         };
 232         struct inode *dst_inode = file_inode(dst);
 233         struct nfs_server *server = NFS_SERVER(dst_inode);
 234         loff_t pos_src = args->src_pos;
 235         loff_t pos_dst = args->dst_pos;
 236         size_t count = args->count;
 237         ssize_t status;
 238
 239         status = nfs4_set_rw_stateid(&args->src_stateid, src_lock->open_context,
 240                                      src_lock, FMODE_READ);
 241         if (status)
 242                 return status;
 243
 244         status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping,
 245                         pos_src, pos_src + (loff_t)count - 1);
 246         if (status)
 247                 return status;
 248
 249         status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context,
 250                                      dst_lock, FMODE_WRITE);
 251         if (status)
 252                 return status;
 253
 254         status = nfs_sync_inode(dst_inode);
 255         if (status)
 256                 return status;
 257
 258         res->commit_res.verf = NULL;
 259         if (args->sync) {
 260                 res->commit_res.verf =
 261                         kzalloc(sizeof(struct nfs_writeverf), GFP_NOFS);
 262                 if (!res->commit_res.verf)
 263                         return -ENOMEM;
 264         }
 265         set_bit(NFS_CLNT_DST_SSC_COPY_STATE,
 266                 &dst_lock->open_context->state->flags);
 267
 268         status = nfs4_call_sync(server->client, server, &msg,
 269                                 &args->seq_args, &res->seq_res, 0);
 270         if (status == -ENOTSUPP)
 271                 server->caps &= ~NFS_CAP_COPY;
 272         if (status)
 273                 goto out;
 274
 275         if (args->sync &&
 276                 nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
 277                                     &res->commit_res.verf->verifier)) {
 278                 status = -EAGAIN;
 279                 goto out;
 280         }
 281
 282         if (!res->synchronous) {
 283                 status = handle_async_copy(res, server, src, dst,
 284                                 &args->src_stateid);
 285                 if (status)
 286                         return status;
 287         }
 288
 289         if ((!res->synchronous || !args->sync) &&
 290                         res->write_res.verifier.committed != NFS_FILE_SYNC) {
 291                 status = process_copy_commit(dst, pos_dst, res);
 292                 if (status)
 293                         return status;
 294         }
 295
 296         truncate_pagecache_range(dst_inode, pos_dst,
 297                                  pos_dst + res->write_res.count);
 298
 299         status = res->write_res.count;
 300 out:
 301         if (args->sync)
 302                 kfree(res->commit_res.verf);
 303         return status;
 304 }
 305
 306 ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 307                         struct file *dst, loff_t pos_dst,
 308                         size_t count)
 309 {
 310         struct nfs_server *server = NFS_SERVER(file_inode(dst));
 311         struct nfs_lock_context *src_lock;
 312         struct nfs_lock_context *dst_lock;
 313         struct nfs42_copy_args args = {
 314                 .src_fh         = NFS_FH(file_inode(src)),
 315                 .src_pos        = pos_src,
 316                 .dst_fh         = NFS_FH(file_inode(dst)),
 317                 .dst_pos        = pos_dst,
 318                 .count          = count,
 319                 .sync           = false,
 320         };
 321         struct nfs42_copy_res res;
 322         struct nfs4_exception src_exception = {
 323                 .inode          = file_inode(src),
 324                 .stateid        = &args.src_stateid,
 325         };
 326         struct nfs4_exception dst_exception = {
 327                 .inode          = file_inode(dst),
 328                 .stateid        = &args.dst_stateid,
 329         };
 330         ssize_t err, err2;
 331
 332         if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
 333                 return -EOPNOTSUPP;
 334
 335         src_lock = nfs_get_lock_context(nfs_file_open_context(src));
 336         if (IS_ERR(src_lock))
 337                 return PTR_ERR(src_lock);
 338
 339         src_exception.state = src_lock->open_context->state;
 340
 341         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
 342         if (IS_ERR(dst_lock)) {
 343                 err = PTR_ERR(dst_lock);
 344                 goto out_put_src_lock;
 345         }
 346
 347         dst_exception.state = dst_lock->open_context->state;
 348
 349         do {
 350                 inode_lock(file_inode(dst));
 351                 err = _nfs42_proc_copy(src, src_lock,
 352                                 dst, dst_lock,
 353                                 &args, &res);
 354                 inode_unlock(file_inode(dst));
 355
 356                 if (err >= 0)
 357                         break;
 358                 if (err == -ENOTSUPP) {
 359                         err = -EOPNOTSUPP;
 360                         break;
 361                 } else if (err == -EAGAIN) {
 362                         dst_exception.retry = 1;
 363                         continue;
 364                 } else if (err == -NFS4ERR_OFFLOAD_NO_REQS && !args.sync) {
 365                         args.sync = true;
 366                         dst_exception.retry = 1;
 367                         continue;
 368                 }
 369
 370                 err2 = nfs4_handle_exception(server, err, &src_exception);
 371                 err  = nfs4_handle_exception(server, err, &dst_exception);
 372                 if (!err)
 373                         err = err2;
 374         } while (src_exception.retry || dst_exception.retry);
 375
 376         nfs_put_lock_context(dst_lock);
 377 out_put_src_lock:
 378         nfs_put_lock_context(src_lock);
 379         return err;
 380 }
 381
 382 struct nfs42_offloadcancel_data {
 383         struct nfs_server *seq_server;
 384         struct nfs42_offload_status_args args;
 385         struct nfs42_offload_status_res res;
 386 };
 387
 388 static void nfs42_offload_cancel_prepare(struct rpc_task *task, void *calldata)
 389 {
 390         struct nfs42_offloadcancel_data *data = calldata;
 391
 392         nfs4_setup_sequence(data->seq_server->nfs_client,
 393                                 &data->args.osa_seq_args,
 394                                 &data->res.osr_seq_res, task);
 395 }
 396
 397 static void nfs42_offload_cancel_done(struct rpc_task *task, void *calldata)
 398 {
 399         struct nfs42_offloadcancel_data *data = calldata;
 400
 401         nfs41_sequence_done(task, &data->res.osr_seq_res);
 402         if (task->tk_status &&
 403                 nfs4_async_handle_error(task, data->seq_server, NULL,
 404                         NULL) == -EAGAIN)
 405                 rpc_restart_call_prepare(task);
 406 }
 407
 408 static void nfs42_free_offloadcancel_data(void *data)
 409 {
 410         kfree(data);
 411 }
 412
 413 static const struct rpc_call_ops nfs42_offload_cancel_ops = {
 414         .rpc_call_prepare = nfs42_offload_cancel_prepare,
 415         .rpc_call_done = nfs42_offload_cancel_done,
 416         .rpc_release = nfs42_free_offloadcancel_data,
 417 };
 418
 419 static int nfs42_do_offload_cancel_async(struct file *dst,
 420                                          nfs4_stateid *stateid)
 421 {
 422         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
 423         struct nfs42_offloadcancel_data *data = NULL;
 424         struct nfs_open_context *ctx = nfs_file_open_context(dst);
 425         struct rpc_task *task;
 426         struct rpc_message msg = {
 427                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OFFLOAD_CANCEL],
 428                 .rpc_cred = ctx->cred,
 429         };
 430         struct rpc_task_setup task_setup_data = {
 431                 .rpc_client = dst_server->client,
 432                 .rpc_message = &msg,
 433                 .callback_ops = &nfs42_offload_cancel_ops,
 434                 .workqueue = nfsiod_workqueue,
 435                 .flags = RPC_TASK_ASYNC,
 436         };
 437         int status;
 438
 439         if (!(dst_server->caps & NFS_CAP_OFFLOAD_CANCEL))
 440                 return -EOPNOTSUPP;
 441
 442         data = kzalloc(sizeof(struct nfs42_offloadcancel_data), GFP_NOFS);
 443         if (data == NULL)
 444                 return -ENOMEM;
 445
 446         data->seq_server = dst_server;
 447         data->args.osa_src_fh = NFS_FH(file_inode(dst));
 448         memcpy(&data->args.osa_stateid, stateid,
 449                 sizeof(data->args.osa_stateid));
 450         msg.rpc_argp = &data->args;
 451         msg.rpc_resp = &data->res;
 452         task_setup_data.callback_data = data;
 453         nfs4_init_sequence(&data->args.osa_seq_args, &data->res.osr_seq_res,
 454                            1, 0);
 455         task = rpc_run_task(&task_setup_data);
 456         if (IS_ERR(task))
 457                 return PTR_ERR(task);
 458         status = rpc_wait_for_completion_task(task);
 459         if (status == -ENOTSUPP)
 460                 dst_server->caps &= ~NFS_CAP_OFFLOAD_CANCEL;
 461         rpc_put_task(task);
 462         return status;
 463 }
 464
 465 static loff_t _nfs42_proc_llseek(struct file *filep,
 466                 struct nfs_lock_context *lock, loff_t offset, int whence)
 467 {
 468         struct inode *inode = file_inode(filep);
 469         struct nfs42_seek_args args = {
 470                 .sa_fh          = NFS_FH(inode),
 471                 .sa_offset      = offset,
 472                 .sa_what        = (whence == SEEK_HOLE) ?
 473                                         NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
 474         };
 475         struct nfs42_seek_res res;
 476         struct rpc_message msg = {
 477                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
 478                 .rpc_argp = &args,
 479                 .rpc_resp = &res,
 480         };
 481         struct nfs_server *server = NFS_SERVER(inode);
 482         int status;
 483
 484         if (!nfs_server_capable(inode, NFS_CAP_SEEK))
 485                 return -ENOTSUPP;
 486
 487         status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
 488                         lock, FMODE_READ);
 489         if (status)
 490                 return status;
 491
 492         status = nfs_filemap_write_and_wait_range(inode->i_mapping,
 493                         offset, LLONG_MAX);
 494         if (status)
 495                 return status;
 496
 497         status = nfs4_call_sync(server->client, server, &msg,
 498                                 &args.seq_args, &res.seq_res, 0);
 499         if (status == -ENOTSUPP)
 500                 server->caps &= ~NFS_CAP_SEEK;
 501         if (status)
 502                 return status;
 503
 504         return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
 505 }
 506
 507 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 508 {
 509         struct nfs_server *server = NFS_SERVER(file_inode(filep));
 510         struct nfs4_exception exception = { };
 511         struct nfs_lock_context *lock;
 512         loff_t err;
 513
 514         lock = nfs_get_lock_context(nfs_file_open_context(filep));
 515         if (IS_ERR(lock))
 516                 return PTR_ERR(lock);
 517
 518         exception.inode = file_inode(filep);
 519         exception.state = lock->open_context->state;
 520
 521         do {
 522                 err = _nfs42_proc_llseek(filep, lock, offset, whence);
 523                 if (err >= 0)
 524                         break;
 525                 if (err == -ENOTSUPP) {
 526                         err = -EOPNOTSUPP;
 527                         break;
 528                 }
 529                 err = nfs4_handle_exception(server, err, &exception);
 530         } while (exception.retry);
 531
 532         nfs_put_lock_context(lock);
 533         return err;
 534 }
 535
 536
 537 static void
 538 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
 539 {
 540         struct nfs42_layoutstat_data *data = calldata;
 541         struct inode *inode = data->inode;
 542         struct nfs_server *server = NFS_SERVER(inode);
 543         struct pnfs_layout_hdr *lo;
 544
 545         spin_lock(&inode->i_lock);
 546         lo = NFS_I(inode)->layout;
 547         if (!pnfs_layout_is_valid(lo)) {
 548                 spin_unlock(&inode->i_lock);
 549                 rpc_exit(task, 0);
 550                 return;
 551         }
 552         nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
 553         spin_unlock(&inode->i_lock);
 554         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
 555                             &data->res.seq_res, task);
 556 }
 557
 558 static void
 559 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
 560 {
 561         struct nfs42_layoutstat_data *data = calldata;
 562         struct inode *inode = data->inode;
 563         struct pnfs_layout_hdr *lo;
 564
 565         if (!nfs4_sequence_done(task, &data->res.seq_res))
 566                 return;
 567
 568         switch (task->tk_status) {
 569         case 0:
 570                 break;
 571         case -NFS4ERR_BADHANDLE:
 572         case -ESTALE:
 573                 pnfs_destroy_layout(NFS_I(inode));
 574                 break;
 575         case -NFS4ERR_EXPIRED:
 576         case -NFS4ERR_ADMIN_REVOKED:
 577         case -NFS4ERR_DELEG_REVOKED:
 578         case -NFS4ERR_STALE_STATEID:
 579         case -NFS4ERR_BAD_STATEID:
 580                 spin_lock(&inode->i_lock);
 581                 lo = NFS_I(inode)->layout;
 582                 if (pnfs_layout_is_valid(lo) &&
 583                     nfs4_stateid_match(&data->args.stateid,
 584                                              &lo->plh_stateid)) {
 585                         LIST_HEAD(head);
 586
 587                         /*
 588                          * Mark the bad layout state as invalid, then retry
 589                          * with the current stateid.
 590                          */
 591                         pnfs_mark_layout_stateid_invalid(lo, &head);
 592                         spin_unlock(&inode->i_lock);
 593                         pnfs_free_lseg_list(&head);
 594                         nfs_commit_inode(inode, 0);
 595                 } else
 596                         spin_unlock(&inode->i_lock);
 597                 break;
 598         case -NFS4ERR_OLD_STATEID:
 599                 spin_lock(&inode->i_lock);
 600                 lo = NFS_I(inode)->layout;
 601                 if (pnfs_layout_is_valid(lo) &&
 602                     nfs4_stateid_match_other(&data->args.stateid,
 603                                         &lo->plh_stateid)) {
 604                         /* Do we need to delay before resending? */
 605                         if (!nfs4_stateid_is_newer(&lo->plh_stateid,
 606                                                 &data->args.stateid))
 607                                 rpc_delay(task, HZ);
 608                         rpc_restart_call_prepare(task);
 609                 }
 610                 spin_unlock(&inode->i_lock);
 611                 break;
 612         case -ENOTSUPP:
 613         case -EOPNOTSUPP:
 614                 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
 615         }
 616 }
 617
 618 static void
 619 nfs42_layoutstat_release(void *calldata)
 620 {
 621         struct nfs42_layoutstat_data *data = calldata;
 622         struct nfs42_layoutstat_devinfo *devinfo = data->args.devinfo;
 623         int i;
 624
 625         for (i = 0; i < data->args.num_dev; i++) {
 626                 if (devinfo[i].ld_private.ops && devinfo[i].ld_private.ops->free)
 627                         devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
 628         }
 629
 630         pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
 631         smp_mb__before_atomic();
 632         clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
 633         smp_mb__after_atomic();
 634         nfs_iput_and_deactive(data->inode);
 635         kfree(data->args.devinfo);
 636         kfree(data);
 637 }
 638
 639 static const struct rpc_call_ops nfs42_layoutstat_ops = {
 640         .rpc_call_prepare = nfs42_layoutstat_prepare,
 641         .rpc_call_done = nfs42_layoutstat_done,
 642         .rpc_release = nfs42_layoutstat_release,
 643 };
 644
 645 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
 646                                    struct nfs42_layoutstat_data *data)
 647 {
 648         struct rpc_message msg = {
 649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
 650                 .rpc_argp = &data->args,
 651                 .rpc_resp = &data->res,
 652         };
 653         struct rpc_task_setup task_setup = {
 654                 .rpc_client = server->client,
 655                 .rpc_message = &msg,
 656                 .callback_ops = &nfs42_layoutstat_ops,
 657                 .callback_data = data,
 658                 .flags = RPC_TASK_ASYNC,
 659         };
 660         struct rpc_task *task;
 661
 662         data->inode = nfs_igrab_and_active(data->args.inode);
 663         if (!data->inode) {
 664                 nfs42_layoutstat_release(data);
 665                 return -EAGAIN;
 666         }
 667         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
 668         task = rpc_run_task(&task_setup);
 669         if (IS_ERR(task))
 670                 return PTR_ERR(task);
 671         rpc_put_task(task);
 672         return 0;
 673 }
 674
 675 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
 676                 struct file *dst_f, struct nfs_lock_context *src_lock,
 677                 struct nfs_lock_context *dst_lock, loff_t src_offset,
 678                 loff_t dst_offset, loff_t count)
 679 {
 680         struct inode *src_inode = file_inode(src_f);
 681         struct inode *dst_inode = file_inode(dst_f);
 682         struct nfs_server *server = NFS_SERVER(dst_inode);
 683         struct nfs42_clone_args args = {
 684                 .src_fh = NFS_FH(src_inode),
 685                 .dst_fh = NFS_FH(dst_inode),
 686                 .src_offset = src_offset,
 687                 .dst_offset = dst_offset,
 688                 .count = count,
 689                 .dst_bitmask = server->cache_consistency_bitmask,
 690         };
 691         struct nfs42_clone_res res = {
 692                 .server = server,
 693         };
 694         int status;
 695
 696         msg->rpc_argp = &args;
 697         msg->rpc_resp = &res;
 698
 699         status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 700                         src_lock, FMODE_READ);
 701         if (status)
 702                 return status;
 703
 704         status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 705                         dst_lock, FMODE_WRITE);
 706         if (status)
 707                 return status;
 708
 709         res.dst_fattr = nfs_alloc_fattr();
 710         if (!res.dst_fattr)
 711                 return -ENOMEM;
 712
 713         status = nfs4_call_sync(server->client, server, msg,
 714                                 &args.seq_args, &res.seq_res, 0);
 715         if (status == 0)
 716                 status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
 717
 718         kfree(res.dst_fattr);
 719         return status;
 720 }
 721
 722 int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
 723                      loff_t src_offset, loff_t dst_offset, loff_t count)
 724 {
 725         struct rpc_message msg = {
 726                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
 727         };
 728         struct inode *inode = file_inode(src_f);
 729         struct nfs_server *server = NFS_SERVER(file_inode(src_f));
 730         struct nfs_lock_context *src_lock;
 731         struct nfs_lock_context *dst_lock;
 732         struct nfs4_exception src_exception = { };
 733         struct nfs4_exception dst_exception = { };
 734         int err, err2;
 735
 736         if (!nfs_server_capable(inode, NFS_CAP_CLONE))
 737                 return -EOPNOTSUPP;
 738
 739         src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
 740         if (IS_ERR(src_lock))
 741                 return PTR_ERR(src_lock);
 742
 743         src_exception.inode = file_inode(src_f);
 744         src_exception.state = src_lock->open_context->state;
 745
 746         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
 747         if (IS_ERR(dst_lock)) {
 748                 err = PTR_ERR(dst_lock);
 749                 goto out_put_src_lock;
 750         }
 751
 752         dst_exception.inode = file_inode(dst_f);
 753         dst_exception.state = dst_lock->open_context->state;
 754
 755         do {
 756                 err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
 757                                         src_offset, dst_offset, count);
 758                 if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
 759                         NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
 760                         err = -EOPNOTSUPP;
 761                         break;
 762                 }
 763
 764                 err2 = nfs4_handle_exception(server, err, &src_exception);
 765                 err = nfs4_handle_exception(server, err, &dst_exception);
 766                 if (!err)
 767                         err = err2;
 768         } while (src_exception.retry || dst_exception.retry);
 769
 770         nfs_put_lock_context(dst_lock);
 771 out_put_src_lock:
 772         nfs_put_lock_context(src_lock);
 773         return err;
 774 }