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                         goto out;
 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                         goto out;
 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         src_lock = nfs_get_lock_context(nfs_file_open_context(src));
 333         if (IS_ERR(src_lock))
 334                 return PTR_ERR(src_lock);
 335
 336         src_exception.state = src_lock->open_context->state;
 337
 338         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
 339         if (IS_ERR(dst_lock)) {
 340                 err = PTR_ERR(dst_lock);
 341                 goto out_put_src_lock;
 342         }
 343
 344         dst_exception.state = dst_lock->open_context->state;
 345
 346         do {
 347                 inode_lock(file_inode(dst));
 348                 err = _nfs42_proc_copy(src, src_lock,
 349                                 dst, dst_lock,
 350                                 &args, &res);
 351                 inode_unlock(file_inode(dst));
 352
 353                 if (err >= 0)
 354                         break;
 355                 if (err == -ENOTSUPP) {
 356                         err = -EOPNOTSUPP;
 357                         break;
 358                 } else if (err == -EAGAIN) {
 359                         dst_exception.retry = 1;
 360                         continue;
 361                 } else if (err == -NFS4ERR_OFFLOAD_NO_REQS && !args.sync) {
 362                         args.sync = true;
 363                         dst_exception.retry = 1;
 364                         continue;
 365                 }
 366
 367                 err2 = nfs4_handle_exception(server, err, &src_exception);
 368                 err  = nfs4_handle_exception(server, err, &dst_exception);
 369                 if (!err)
 370                         err = err2;
 371         } while (src_exception.retry || dst_exception.retry);
 372
 373         nfs_put_lock_context(dst_lock);
 374 out_put_src_lock:
 375         nfs_put_lock_context(src_lock);
 376         return err;
 377 }
 378
 379 struct nfs42_offloadcancel_data {
 380         struct nfs_server *seq_server;
 381         struct nfs42_offload_status_args args;
 382         struct nfs42_offload_status_res res;
 383 };
 384
 385 static void nfs42_offload_cancel_prepare(struct rpc_task *task, void *calldata)
 386 {
 387         struct nfs42_offloadcancel_data *data = calldata;
 388
 389         nfs4_setup_sequence(data->seq_server->nfs_client,
 390                                 &data->args.osa_seq_args,
 391                                 &data->res.osr_seq_res, task);
 392 }
 393
 394 static void nfs42_offload_cancel_done(struct rpc_task *task, void *calldata)
 395 {
 396         struct nfs42_offloadcancel_data *data = calldata;
 397
 398         nfs41_sequence_done(task, &data->res.osr_seq_res);
 399         if (task->tk_status &&
 400                 nfs4_async_handle_error(task, data->seq_server, NULL,
 401                         NULL) == -EAGAIN)
 402                 rpc_restart_call_prepare(task);
 403 }
 404
 405 static void nfs42_free_offloadcancel_data(void *data)
 406 {
 407         kfree(data);
 408 }
 409
 410 static const struct rpc_call_ops nfs42_offload_cancel_ops = {
 411         .rpc_call_prepare = nfs42_offload_cancel_prepare,
 412         .rpc_call_done = nfs42_offload_cancel_done,
 413         .rpc_release = nfs42_free_offloadcancel_data,
 414 };
 415
 416 static int nfs42_do_offload_cancel_async(struct file *dst,
 417                                          nfs4_stateid *stateid)
 418 {
 419         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
 420         struct nfs42_offloadcancel_data *data = NULL;
 421         struct nfs_open_context *ctx = nfs_file_open_context(dst);
 422         struct rpc_task *task;
 423         struct rpc_message msg = {
 424                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OFFLOAD_CANCEL],
 425                 .rpc_cred = ctx->cred,
 426         };
 427         struct rpc_task_setup task_setup_data = {
 428                 .rpc_client = dst_server->client,
 429                 .rpc_message = &msg,
 430                 .callback_ops = &nfs42_offload_cancel_ops,
 431                 .workqueue = nfsiod_workqueue,
 432                 .flags = RPC_TASK_ASYNC,
 433         };
 434         int status;
 435
 436         if (!(dst_server->caps & NFS_CAP_OFFLOAD_CANCEL))
 437                 return -EOPNOTSUPP;
 438
 439         data = kzalloc(sizeof(struct nfs42_offloadcancel_data), GFP_NOFS);
 440         if (data == NULL)
 441                 return -ENOMEM;
 442
 443         data->seq_server = dst_server;
 444         data->args.osa_src_fh = NFS_FH(file_inode(dst));
 445         memcpy(&data->args.osa_stateid, stateid,
 446                 sizeof(data->args.osa_stateid));
 447         msg.rpc_argp = &data->args;
 448         msg.rpc_resp = &data->res;
 449         task_setup_data.callback_data = data;
 450         nfs4_init_sequence(&data->args.osa_seq_args, &data->res.osr_seq_res,
 451                            1, 0);
 452         task = rpc_run_task(&task_setup_data);
 453         if (IS_ERR(task))
 454                 return PTR_ERR(task);
 455         status = rpc_wait_for_completion_task(task);
 456         if (status == -ENOTSUPP)
 457                 dst_server->caps &= ~NFS_CAP_OFFLOAD_CANCEL;
 458         rpc_put_task(task);
 459         return status;
 460 }
 461
 462 static loff_t _nfs42_proc_llseek(struct file *filep,
 463                 struct nfs_lock_context *lock, loff_t offset, int whence)
 464 {
 465         struct inode *inode = file_inode(filep);
 466         struct nfs42_seek_args args = {
 467                 .sa_fh          = NFS_FH(inode),
 468                 .sa_offset      = offset,
 469                 .sa_what        = (whence == SEEK_HOLE) ?
 470                                         NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
 471         };
 472         struct nfs42_seek_res res;
 473         struct rpc_message msg = {
 474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
 475                 .rpc_argp = &args,
 476                 .rpc_resp = &res,
 477         };
 478         struct nfs_server *server = NFS_SERVER(inode);
 479         int status;
 480
 481         if (!nfs_server_capable(inode, NFS_CAP_SEEK))
 482                 return -ENOTSUPP;
 483
 484         status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
 485                         lock, FMODE_READ);
 486         if (status)
 487                 return status;
 488
 489         status = nfs_filemap_write_and_wait_range(inode->i_mapping,
 490                         offset, LLONG_MAX);
 491         if (status)
 492                 return status;
 493
 494         status = nfs4_call_sync(server->client, server, &msg,
 495                                 &args.seq_args, &res.seq_res, 0);
 496         if (status == -ENOTSUPP)
 497                 server->caps &= ~NFS_CAP_SEEK;
 498         if (status)
 499                 return status;
 500
 501         return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
 502 }
 503
 504 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 505 {
 506         struct nfs_server *server = NFS_SERVER(file_inode(filep));
 507         struct nfs4_exception exception = { };
 508         struct nfs_lock_context *lock;
 509         loff_t err;
 510
 511         lock = nfs_get_lock_context(nfs_file_open_context(filep));
 512         if (IS_ERR(lock))
 513                 return PTR_ERR(lock);
 514
 515         exception.inode = file_inode(filep);
 516         exception.state = lock->open_context->state;
 517
 518         do {
 519                 err = _nfs42_proc_llseek(filep, lock, offset, whence);
 520                 if (err >= 0)
 521                         break;
 522                 if (err == -ENOTSUPP) {
 523                         err = -EOPNOTSUPP;
 524                         break;
 525                 }
 526                 err = nfs4_handle_exception(server, err, &exception);
 527         } while (exception.retry);
 528
 529         nfs_put_lock_context(lock);
 530         return err;
 531 }
 532
 533
 534 static void
 535 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
 536 {
 537         struct nfs42_layoutstat_data *data = calldata;
 538         struct inode *inode = data->inode;
 539         struct nfs_server *server = NFS_SERVER(inode);
 540         struct pnfs_layout_hdr *lo;
 541
 542         spin_lock(&inode->i_lock);
 543         lo = NFS_I(inode)->layout;
 544         if (!pnfs_layout_is_valid(lo)) {
 545                 spin_unlock(&inode->i_lock);
 546                 rpc_exit(task, 0);
 547                 return;
 548         }
 549         nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
 550         spin_unlock(&inode->i_lock);
 551         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
 552                             &data->res.seq_res, task);
 553 }
 554
 555 static void
 556 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
 557 {
 558         struct nfs42_layoutstat_data *data = calldata;
 559         struct inode *inode = data->inode;
 560         struct pnfs_layout_hdr *lo;
 561
 562         if (!nfs4_sequence_done(task, &data->res.seq_res))
 563                 return;
 564
 565         switch (task->tk_status) {
 566         case 0:
 567                 break;
 568         case -NFS4ERR_BADHANDLE:
 569         case -ESTALE:
 570                 pnfs_destroy_layout(NFS_I(inode));
 571                 break;
 572         case -NFS4ERR_EXPIRED:
 573         case -NFS4ERR_ADMIN_REVOKED:
 574         case -NFS4ERR_DELEG_REVOKED:
 575         case -NFS4ERR_STALE_STATEID:
 576         case -NFS4ERR_BAD_STATEID:
 577                 spin_lock(&inode->i_lock);
 578                 lo = NFS_I(inode)->layout;
 579                 if (pnfs_layout_is_valid(lo) &&
 580                     nfs4_stateid_match(&data->args.stateid,
 581                                              &lo->plh_stateid)) {
 582                         LIST_HEAD(head);
 583
 584                         /*
 585                          * Mark the bad layout state as invalid, then retry
 586                          * with the current stateid.
 587                          */
 588                         pnfs_mark_layout_stateid_invalid(lo, &head);
 589                         spin_unlock(&inode->i_lock);
 590                         pnfs_free_lseg_list(&head);
 591                         nfs_commit_inode(inode, 0);
 592                 } else
 593                         spin_unlock(&inode->i_lock);
 594                 break;
 595         case -NFS4ERR_OLD_STATEID:
 596                 spin_lock(&inode->i_lock);
 597                 lo = NFS_I(inode)->layout;
 598                 if (pnfs_layout_is_valid(lo) &&
 599                     nfs4_stateid_match_other(&data->args.stateid,
 600                                         &lo->plh_stateid)) {
 601                         /* Do we need to delay before resending? */
 602                         if (!nfs4_stateid_is_newer(&lo->plh_stateid,
 603                                                 &data->args.stateid))
 604                                 rpc_delay(task, HZ);
 605                         rpc_restart_call_prepare(task);
 606                 }
 607                 spin_unlock(&inode->i_lock);
 608                 break;
 609         case -ENOTSUPP:
 610         case -EOPNOTSUPP:
 611                 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
 612         }
 613 }
 614
 615 static void
 616 nfs42_layoutstat_release(void *calldata)
 617 {
 618         struct nfs42_layoutstat_data *data = calldata;
 619         struct nfs42_layoutstat_devinfo *devinfo = data->args.devinfo;
 620         int i;
 621
 622         for (i = 0; i < data->args.num_dev; i++) {
 623                 if (devinfo[i].ld_private.ops && devinfo[i].ld_private.ops->free)
 624                         devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
 625         }
 626
 627         pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
 628         smp_mb__before_atomic();
 629         clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
 630         smp_mb__after_atomic();
 631         nfs_iput_and_deactive(data->inode);
 632         kfree(data->args.devinfo);
 633         kfree(data);
 634 }
 635
 636 static const struct rpc_call_ops nfs42_layoutstat_ops = {
 637         .rpc_call_prepare = nfs42_layoutstat_prepare,
 638         .rpc_call_done = nfs42_layoutstat_done,
 639         .rpc_release = nfs42_layoutstat_release,
 640 };
 641
 642 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
 643                                    struct nfs42_layoutstat_data *data)
 644 {
 645         struct rpc_message msg = {
 646                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
 647                 .rpc_argp = &data->args,
 648                 .rpc_resp = &data->res,
 649         };
 650         struct rpc_task_setup task_setup = {
 651                 .rpc_client = server->client,
 652                 .rpc_message = &msg,
 653                 .callback_ops = &nfs42_layoutstat_ops,
 654                 .callback_data = data,
 655                 .flags = RPC_TASK_ASYNC,
 656         };
 657         struct rpc_task *task;
 658
 659         data->inode = nfs_igrab_and_active(data->args.inode);
 660         if (!data->inode) {
 661                 nfs42_layoutstat_release(data);
 662                 return -EAGAIN;
 663         }
 664         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
 665         task = rpc_run_task(&task_setup);
 666         if (IS_ERR(task))
 667                 return PTR_ERR(task);
 668         rpc_put_task(task);
 669         return 0;
 670 }
 671
 672 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
 673                 struct file *dst_f, struct nfs_lock_context *src_lock,
 674                 struct nfs_lock_context *dst_lock, loff_t src_offset,
 675                 loff_t dst_offset, loff_t count)
 676 {
 677         struct inode *src_inode = file_inode(src_f);
 678         struct inode *dst_inode = file_inode(dst_f);
 679         struct nfs_server *server = NFS_SERVER(dst_inode);
 680         struct nfs42_clone_args args = {
 681                 .src_fh = NFS_FH(src_inode),
 682                 .dst_fh = NFS_FH(dst_inode),
 683                 .src_offset = src_offset,
 684                 .dst_offset = dst_offset,
 685                 .count = count,
 686                 .dst_bitmask = server->cache_consistency_bitmask,
 687         };
 688         struct nfs42_clone_res res = {
 689                 .server = server,
 690         };
 691         int status;
 692
 693         msg->rpc_argp = &args;
 694         msg->rpc_resp = &res;
 695
 696         status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 697                         src_lock, FMODE_READ);
 698         if (status)
 699                 return status;
 700
 701         status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 702                         dst_lock, FMODE_WRITE);
 703         if (status)
 704                 return status;
 705
 706         res.dst_fattr = nfs_alloc_fattr();
 707         if (!res.dst_fattr)
 708                 return -ENOMEM;
 709
 710         status = nfs4_call_sync(server->client, server, msg,
 711                                 &args.seq_args, &res.seq_res, 0);
 712         if (status == 0)
 713                 status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
 714
 715         kfree(res.dst_fattr);
 716         return status;
 717 }
 718
 719 int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
 720                      loff_t src_offset, loff_t dst_offset, loff_t count)
 721 {
 722         struct rpc_message msg = {
 723                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
 724         };
 725         struct inode *inode = file_inode(src_f);
 726         struct nfs_server *server = NFS_SERVER(file_inode(src_f));
 727         struct nfs_lock_context *src_lock;
 728         struct nfs_lock_context *dst_lock;
 729         struct nfs4_exception src_exception = { };
 730         struct nfs4_exception dst_exception = { };
 731         int err, err2;
 732
 733         if (!nfs_server_capable(inode, NFS_CAP_CLONE))
 734                 return -EOPNOTSUPP;
 735
 736         src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
 737         if (IS_ERR(src_lock))
 738                 return PTR_ERR(src_lock);
 739
 740         src_exception.inode = file_inode(src_f);
 741         src_exception.state = src_lock->open_context->state;
 742
 743         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
 744         if (IS_ERR(dst_lock)) {
 745                 err = PTR_ERR(dst_lock);
 746                 goto out_put_src_lock;
 747         }
 748
 749         dst_exception.inode = file_inode(dst_f);
 750         dst_exception.state = dst_lock->open_context->state;
 751
 752         do {
 753                 err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
 754                                         src_offset, dst_offset, count);
 755                 if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
 756                         NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
 757                         err = -EOPNOTSUPP;
 758                         break;
 759                 }
 760
 761                 err2 = nfs4_handle_exception(server, err, &src_exception);
 762                 err = nfs4_handle_exception(server, err, &dst_exception);
 763                 if (!err)
 764                         err = err2;
 765         } while (src_exception.retry || dst_exception.retry);
 766
 767         nfs_put_lock_context(dst_lock);
 768 out_put_src_lock:
 769         nfs_put_lock_context(src_lock);
 770         return err;
 771 }