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
  21 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  22                 struct nfs_lock_context *lock, loff_t offset, loff_t len)
  23 {
  24         struct inode *inode = file_inode(filep);
  25         struct nfs_server *server = NFS_SERVER(inode);
  26         struct nfs42_falloc_args args = {
  27                 .falloc_fh      = NFS_FH(inode),
  28                 .falloc_offset  = offset,
  29                 .falloc_length  = len,
  30                 .falloc_bitmask = server->cache_consistency_bitmask,
  31         };
  32         struct nfs42_falloc_res res = {
  33                 .falloc_server  = server,
  34         };
  35         int status;
  36
  37         msg->rpc_argp = &args;
  38         msg->rpc_resp = &res;
  39
  40         status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
  41                         lock, FMODE_WRITE);
  42         if (status)
  43                 return status;
  44
  45         res.falloc_fattr = nfs_alloc_fattr();
  46         if (!res.falloc_fattr)
  47                 return -ENOMEM;
  48
  49         status = nfs4_call_sync(server->client, server, msg,
  50                                 &args.seq_args, &res.seq_res, 0);
  51         if (status == 0)
  52                 status = nfs_post_op_update_inode(inode, res.falloc_fattr);
  53
  54         kfree(res.falloc_fattr);
  55         return status;
  56 }
  57
  58 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  59                                 loff_t offset, loff_t len)
  60 {
  61         struct nfs_server *server = NFS_SERVER(file_inode(filep));
  62         struct nfs4_exception exception = { };
  63         struct nfs_lock_context *lock;
  64         int err;
  65
  66         lock = nfs_get_lock_context(nfs_file_open_context(filep));
  67         if (IS_ERR(lock))
  68                 return PTR_ERR(lock);
  69
  70         exception.inode = file_inode(filep);
  71         exception.state = lock->open_context->state;
  72
  73         do {
  74                 err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
  75                 if (err == -ENOTSUPP) {
  76                         err = -EOPNOTSUPP;
  77                         break;
  78                 }
  79                 err = nfs4_handle_exception(server, err, &exception);
  80         } while (exception.retry);
  81
  82         nfs_put_lock_context(lock);
  83         return err;
  84 }
  85
  86 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
  87 {
  88         struct rpc_message msg = {
  89                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
  90         };
  91         struct inode *inode = file_inode(filep);
  92         int err;
  93
  94         if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
  95                 return -EOPNOTSUPP;
  96
  97         inode_lock(inode);
  98
  99         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 100         if (err == -EOPNOTSUPP)
 101                 NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
 102
 103         inode_unlock(inode);
 104         return err;
 105 }
 106
 107 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
 108 {
 109         struct rpc_message msg = {
 110                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
 111         };
 112         struct inode *inode = file_inode(filep);
 113         int err;
 114
 115         if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
 116                 return -EOPNOTSUPP;
 117
 118         inode_lock(inode);
 119         err = nfs_sync_inode(inode);
 120         if (err)
 121                 goto out_unlock;
 122
 123         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 124         if (err == 0)
 125                 truncate_pagecache_range(inode, offset, (offset + len) -1);
 126         if (err == -EOPNOTSUPP)
 127                 NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
 128 out_unlock:
 129         inode_unlock(inode);
 130         return err;
 131 }
 132
 133 static ssize_t _nfs42_proc_copy(struct file *src,
 134                                 struct nfs_lock_context *src_lock,
 135                                 struct file *dst,
 136                                 struct nfs_lock_context *dst_lock,
 137                                 struct nfs42_copy_args *args,
 138                                 struct nfs42_copy_res *res)
 139 {
 140         struct rpc_message msg = {
 141                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
 142                 .rpc_argp = args,
 143                 .rpc_resp = res,
 144         };
 145         struct inode *dst_inode = file_inode(dst);
 146         struct nfs_server *server = NFS_SERVER(dst_inode);
 147         loff_t pos_src = args->src_pos;
 148         loff_t pos_dst = args->dst_pos;
 149         size_t count = args->count;
 150         ssize_t status;
 151
 152         status = nfs4_set_rw_stateid(&args->src_stateid, src_lock->open_context,
 153                                      src_lock, FMODE_READ);
 154         if (status)
 155                 return status;
 156
 157         status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping,
 158                         pos_src, pos_src + (loff_t)count - 1);
 159         if (status)
 160                 return status;
 161
 162         status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context,
 163                                      dst_lock, FMODE_WRITE);
 164         if (status)
 165                 return status;
 166
 167         status = nfs_sync_inode(dst_inode);
 168         if (status)
 169                 return status;
 170
 171         res->commit_res.verf = kzalloc(sizeof(struct nfs_writeverf), GFP_NOFS);
 172         if (!res->commit_res.verf)
 173                 return -ENOMEM;
 174         status = nfs4_call_sync(server->client, server, &msg,
 175                                 &args->seq_args, &res->seq_res, 0);
 176         if (status == -ENOTSUPP)
 177                 server->caps &= ~NFS_CAP_COPY;
 178         if (status)
 179                 goto out;
 180
 181         if (nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
 182                                     &res->commit_res.verf->verifier)) {
 183                 status = -EAGAIN;
 184                 goto out;
 185         }
 186
 187         truncate_pagecache_range(dst_inode, pos_dst,
 188                                  pos_dst + res->write_res.count);
 189
 190         status = res->write_res.count;
 191 out:
 192         kfree(res->commit_res.verf);
 193         return status;
 194 }
 195
 196 ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 197                         struct file *dst, loff_t pos_dst,
 198                         size_t count)
 199 {
 200         struct nfs_server *server = NFS_SERVER(file_inode(dst));
 201         struct nfs_lock_context *src_lock;
 202         struct nfs_lock_context *dst_lock;
 203         struct nfs42_copy_args args = {
 204                 .src_fh         = NFS_FH(file_inode(src)),
 205                 .src_pos        = pos_src,
 206                 .dst_fh         = NFS_FH(file_inode(dst)),
 207                 .dst_pos        = pos_dst,
 208                 .count          = count,
 209         };
 210         struct nfs42_copy_res res;
 211         struct nfs4_exception src_exception = {
 212                 .inode          = file_inode(src),
 213                 .stateid        = &args.src_stateid,
 214         };
 215         struct nfs4_exception dst_exception = {
 216                 .inode          = file_inode(dst),
 217                 .stateid        = &args.dst_stateid,
 218         };
 219         ssize_t err, err2;
 220
 221         if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
 222                 return -EOPNOTSUPP;
 223
 224         src_lock = nfs_get_lock_context(nfs_file_open_context(src));
 225         if (IS_ERR(src_lock))
 226                 return PTR_ERR(src_lock);
 227
 228         src_exception.state = src_lock->open_context->state;
 229
 230         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
 231         if (IS_ERR(dst_lock)) {
 232                 err = PTR_ERR(dst_lock);
 233                 goto out_put_src_lock;
 234         }
 235
 236         dst_exception.state = dst_lock->open_context->state;
 237
 238         do {
 239                 inode_lock(file_inode(dst));
 240                 err = _nfs42_proc_copy(src, src_lock,
 241                                 dst, dst_lock,
 242                                 &args, &res);
 243                 inode_unlock(file_inode(dst));
 244
 245                 if (err >= 0)
 246                         break;
 247                 if (err == -ENOTSUPP) {
 248                         err = -EOPNOTSUPP;
 249                         break;
 250                 } if (err == -EAGAIN) {
 251                         dst_exception.retry = 1;
 252                         continue;
 253                 }
 254
 255                 err2 = nfs4_handle_exception(server, err, &src_exception);
 256                 err  = nfs4_handle_exception(server, err, &dst_exception);
 257                 if (!err)
 258                         err = err2;
 259         } while (src_exception.retry || dst_exception.retry);
 260
 261         nfs_put_lock_context(dst_lock);
 262 out_put_src_lock:
 263         nfs_put_lock_context(src_lock);
 264         return err;
 265 }
 266
 267 static loff_t _nfs42_proc_llseek(struct file *filep,
 268                 struct nfs_lock_context *lock, loff_t offset, int whence)
 269 {
 270         struct inode *inode = file_inode(filep);
 271         struct nfs42_seek_args args = {
 272                 .sa_fh          = NFS_FH(inode),
 273                 .sa_offset      = offset,
 274                 .sa_what        = (whence == SEEK_HOLE) ?
 275                                         NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
 276         };
 277         struct nfs42_seek_res res;
 278         struct rpc_message msg = {
 279                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
 280                 .rpc_argp = &args,
 281                 .rpc_resp = &res,
 282         };
 283         struct nfs_server *server = NFS_SERVER(inode);
 284         int status;
 285
 286         if (!nfs_server_capable(inode, NFS_CAP_SEEK))
 287                 return -ENOTSUPP;
 288
 289         status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
 290                         lock, FMODE_READ);
 291         if (status)
 292                 return status;
 293
 294         status = nfs_filemap_write_and_wait_range(inode->i_mapping,
 295                         offset, LLONG_MAX);
 296         if (status)
 297                 return status;
 298
 299         status = nfs4_call_sync(server->client, server, &msg,
 300                                 &args.seq_args, &res.seq_res, 0);
 301         if (status == -ENOTSUPP)
 302                 server->caps &= ~NFS_CAP_SEEK;
 303         if (status)
 304                 return status;
 305
 306         return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
 307 }
 308
 309 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 310 {
 311         struct nfs_server *server = NFS_SERVER(file_inode(filep));
 312         struct nfs4_exception exception = { };
 313         struct nfs_lock_context *lock;
 314         loff_t err;
 315
 316         lock = nfs_get_lock_context(nfs_file_open_context(filep));
 317         if (IS_ERR(lock))
 318                 return PTR_ERR(lock);
 319
 320         exception.inode = file_inode(filep);
 321         exception.state = lock->open_context->state;
 322
 323         do {
 324                 err = _nfs42_proc_llseek(filep, lock, offset, whence);
 325                 if (err >= 0)
 326                         break;
 327                 if (err == -ENOTSUPP) {
 328                         err = -EOPNOTSUPP;
 329                         break;
 330                 }
 331                 err = nfs4_handle_exception(server, err, &exception);
 332         } while (exception.retry);
 333
 334         nfs_put_lock_context(lock);
 335         return err;
 336 }
 337
 338
 339 static void
 340 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
 341 {
 342         struct nfs42_layoutstat_data *data = calldata;
 343         struct inode *inode = data->inode;
 344         struct nfs_server *server = NFS_SERVER(inode);
 345         struct pnfs_layout_hdr *lo;
 346
 347         spin_lock(&inode->i_lock);
 348         lo = NFS_I(inode)->layout;
 349         if (!pnfs_layout_is_valid(lo)) {
 350                 spin_unlock(&inode->i_lock);
 351                 rpc_exit(task, 0);
 352                 return;
 353         }
 354         nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
 355         spin_unlock(&inode->i_lock);
 356         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
 357                             &data->res.seq_res, task);
 358 }
 359
 360 static void
 361 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
 362 {
 363         struct nfs42_layoutstat_data *data = calldata;
 364         struct inode *inode = data->inode;
 365         struct pnfs_layout_hdr *lo;
 366
 367         if (!nfs4_sequence_done(task, &data->res.seq_res))
 368                 return;
 369
 370         switch (task->tk_status) {
 371         case 0:
 372                 break;
 373         case -NFS4ERR_BADHANDLE:
 374         case -ESTALE:
 375                 pnfs_destroy_layout(NFS_I(inode));
 376                 break;
 377         case -NFS4ERR_EXPIRED:
 378         case -NFS4ERR_ADMIN_REVOKED:
 379         case -NFS4ERR_DELEG_REVOKED:
 380         case -NFS4ERR_STALE_STATEID:
 381         case -NFS4ERR_BAD_STATEID:
 382                 spin_lock(&inode->i_lock);
 383                 lo = NFS_I(inode)->layout;
 384                 if (pnfs_layout_is_valid(lo) &&
 385                     nfs4_stateid_match(&data->args.stateid,
 386                                              &lo->plh_stateid)) {
 387                         LIST_HEAD(head);
 388
 389                         /*
 390                          * Mark the bad layout state as invalid, then retry
 391                          * with the current stateid.
 392                          */
 393                         pnfs_mark_layout_stateid_invalid(lo, &head);
 394                         spin_unlock(&inode->i_lock);
 395                         pnfs_free_lseg_list(&head);
 396                         nfs_commit_inode(inode, 0);
 397                 } else
 398                         spin_unlock(&inode->i_lock);
 399                 break;
 400         case -NFS4ERR_OLD_STATEID:
 401                 spin_lock(&inode->i_lock);
 402                 lo = NFS_I(inode)->layout;
 403                 if (pnfs_layout_is_valid(lo) &&
 404                     nfs4_stateid_match_other(&data->args.stateid,
 405                                         &lo->plh_stateid)) {
 406                         /* Do we need to delay before resending? */
 407                         if (!nfs4_stateid_is_newer(&lo->plh_stateid,
 408                                                 &data->args.stateid))
 409                                 rpc_delay(task, HZ);
 410                         rpc_restart_call_prepare(task);
 411                 }
 412                 spin_unlock(&inode->i_lock);
 413                 break;
 414         case -ENOTSUPP:
 415         case -EOPNOTSUPP:
 416                 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
 417         }
 418 }
 419
 420 static void
 421 nfs42_layoutstat_release(void *calldata)
 422 {
 423         struct nfs42_layoutstat_data *data = calldata;
 424         struct nfs42_layoutstat_devinfo *devinfo = data->args.devinfo;
 425         int i;
 426
 427         for (i = 0; i < data->args.num_dev; i++) {
 428                 if (devinfo[i].ld_private.ops && devinfo[i].ld_private.ops->free)
 429                         devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
 430         }
 431
 432         pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
 433         smp_mb__before_atomic();
 434         clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
 435         smp_mb__after_atomic();
 436         nfs_iput_and_deactive(data->inode);
 437         kfree(data->args.devinfo);
 438         kfree(data);
 439 }
 440
 441 static const struct rpc_call_ops nfs42_layoutstat_ops = {
 442         .rpc_call_prepare = nfs42_layoutstat_prepare,
 443         .rpc_call_done = nfs42_layoutstat_done,
 444         .rpc_release = nfs42_layoutstat_release,
 445 };
 446
 447 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
 448                                    struct nfs42_layoutstat_data *data)
 449 {
 450         struct rpc_message msg = {
 451                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
 452                 .rpc_argp = &data->args,
 453                 .rpc_resp = &data->res,
 454         };
 455         struct rpc_task_setup task_setup = {
 456                 .rpc_client = server->client,
 457                 .rpc_message = &msg,
 458                 .callback_ops = &nfs42_layoutstat_ops,
 459                 .callback_data = data,
 460                 .flags = RPC_TASK_ASYNC,
 461         };
 462         struct rpc_task *task;
 463
 464         data->inode = nfs_igrab_and_active(data->args.inode);
 465         if (!data->inode) {
 466                 nfs42_layoutstat_release(data);
 467                 return -EAGAIN;
 468         }
 469         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
 470         task = rpc_run_task(&task_setup);
 471         if (IS_ERR(task))
 472                 return PTR_ERR(task);
 473         rpc_put_task(task);
 474         return 0;
 475 }
 476
 477 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
 478                 struct file *dst_f, struct nfs_lock_context *src_lock,
 479                 struct nfs_lock_context *dst_lock, loff_t src_offset,
 480                 loff_t dst_offset, loff_t count)
 481 {
 482         struct inode *src_inode = file_inode(src_f);
 483         struct inode *dst_inode = file_inode(dst_f);
 484         struct nfs_server *server = NFS_SERVER(dst_inode);
 485         struct nfs42_clone_args args = {
 486                 .src_fh = NFS_FH(src_inode),
 487                 .dst_fh = NFS_FH(dst_inode),
 488                 .src_offset = src_offset,
 489                 .dst_offset = dst_offset,
 490                 .count = count,
 491                 .dst_bitmask = server->cache_consistency_bitmask,
 492         };
 493         struct nfs42_clone_res res = {
 494                 .server = server,
 495         };
 496         int status;
 497
 498         msg->rpc_argp = &args;
 499         msg->rpc_resp = &res;
 500
 501         status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 502                         src_lock, FMODE_READ);
 503         if (status)
 504                 return status;
 505
 506         status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 507                         dst_lock, FMODE_WRITE);
 508         if (status)
 509                 return status;
 510
 511         res.dst_fattr = nfs_alloc_fattr();
 512         if (!res.dst_fattr)
 513                 return -ENOMEM;
 514
 515         status = nfs4_call_sync(server->client, server, msg,
 516                                 &args.seq_args, &res.seq_res, 0);
 517         if (status == 0)
 518                 status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
 519
 520         kfree(res.dst_fattr);
 521         return status;
 522 }
 523
 524 int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
 525                      loff_t src_offset, loff_t dst_offset, loff_t count)
 526 {
 527         struct rpc_message msg = {
 528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
 529         };
 530         struct inode *inode = file_inode(src_f);
 531         struct nfs_server *server = NFS_SERVER(file_inode(src_f));
 532         struct nfs_lock_context *src_lock;
 533         struct nfs_lock_context *dst_lock;
 534         struct nfs4_exception src_exception = { };
 535         struct nfs4_exception dst_exception = { };
 536         int err, err2;
 537
 538         if (!nfs_server_capable(inode, NFS_CAP_CLONE))
 539                 return -EOPNOTSUPP;
 540
 541         src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
 542         if (IS_ERR(src_lock))
 543                 return PTR_ERR(src_lock);
 544
 545         src_exception.inode = file_inode(src_f);
 546         src_exception.state = src_lock->open_context->state;
 547
 548         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
 549         if (IS_ERR(dst_lock)) {
 550                 err = PTR_ERR(dst_lock);
 551                 goto out_put_src_lock;
 552         }
 553
 554         dst_exception.inode = file_inode(dst_f);
 555         dst_exception.state = dst_lock->open_context->state;
 556
 557         do {
 558                 err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
 559                                         src_offset, dst_offset, count);
 560                 if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
 561                         NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
 562                         err = -EOPNOTSUPP;
 563                         break;
 564                 }
 565
 566                 err2 = nfs4_handle_exception(server, err, &src_exception);
 567                 err = nfs4_handle_exception(server, err, &dst_exception);
 568                 if (!err)
 569                         err = err2;
 570         } while (src_exception.retry || dst_exception.retry);
 571
 572         nfs_put_lock_context(dst_lock);
 573 out_put_src_lock:
 574         nfs_put_lock_context(src_lock);
 575         return err;
 576 }