fs/nfs/nfs42proc.c

   1 /*
   2  * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
   3  */
   4 #include <linux/fs.h>
   5 #include <linux/sunrpc/sched.h>
   6 #include <linux/nfs.h>
   7 #include <linux/nfs3.h>
   8 #include <linux/nfs4.h>
   9 #include <linux/nfs_xdr.h>
  10 #include <linux/nfs_fs.h>
  11 #include "nfs4_fs.h"
  12 #include "nfs42.h"
  13 #include "iostat.h"
  14 #include "pnfs.h"
  15 #include "nfs4session.h"
  16 #include "internal.h"
  17
  18 #define NFSDBG_FACILITY NFSDBG_PROC
  19
  20 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  21                 struct nfs_lock_context *lock, loff_t offset, loff_t len)
  22 {
  23         struct inode *inode = file_inode(filep);
  24         struct nfs_server *server = NFS_SERVER(inode);
  25         struct nfs42_falloc_args args = {
  26                 .falloc_fh      = NFS_FH(inode),
  27                 .falloc_offset  = offset,
  28                 .falloc_length  = len,
  29                 .falloc_bitmask = server->cache_consistency_bitmask,
  30         };
  31         struct nfs42_falloc_res res = {
  32                 .falloc_server  = server,
  33         };
  34         int status;
  35
  36         msg->rpc_argp = &args;
  37         msg->rpc_resp = &res;
  38
  39         status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
  40                         lock, FMODE_WRITE);
  41         if (status)
  42                 return status;
  43
  44         res.falloc_fattr = nfs_alloc_fattr();
  45         if (!res.falloc_fattr)
  46                 return -ENOMEM;
  47
  48         status = nfs4_call_sync(server->client, server, msg,
  49                                 &args.seq_args, &res.seq_res, 0);
  50         if (status == 0)
  51                 status = nfs_post_op_update_inode(inode, res.falloc_fattr);
  52
  53         kfree(res.falloc_fattr);
  54         return status;
  55 }
  56
  57 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  58                                 loff_t offset, loff_t len)
  59 {
  60         struct nfs_server *server = NFS_SERVER(file_inode(filep));
  61         struct nfs4_exception exception = { };
  62         struct nfs_lock_context *lock;
  63         int err;
  64
  65         lock = nfs_get_lock_context(nfs_file_open_context(filep));
  66         if (IS_ERR(lock))
  67                 return PTR_ERR(lock);
  68
  69         exception.inode = file_inode(filep);
  70         exception.state = lock->open_context->state;
  71
  72         do {
  73                 err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
  74                 if (err == -ENOTSUPP) {
  75                         err = -EOPNOTSUPP;
  76                         break;
  77                 }
  78                 err = nfs4_handle_exception(server, err, &exception);
  79         } while (exception.retry);
  80
  81         nfs_put_lock_context(lock);
  82         return err;
  83 }
  84
  85 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
  86 {
  87         struct rpc_message msg = {
  88                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
  89         };
  90         struct inode *inode = file_inode(filep);
  91         int err;
  92
  93         if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
  94                 return -EOPNOTSUPP;
  95
  96         inode_lock(inode);
  97
  98         err = nfs42_proc_fallocate(&msg, filep, offset, len);
  99         if (err == -EOPNOTSUPP)
 100                 NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
 101
 102         inode_unlock(inode);
 103         return err;
 104 }
 105
 106 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
 107 {
 108         struct rpc_message msg = {
 109                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
 110         };
 111         struct inode *inode = file_inode(filep);
 112         int err;
 113
 114         if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
 115                 return -EOPNOTSUPP;
 116
 117         inode_lock(inode);
 118         err = nfs_sync_inode(inode);
 119         if (err)
 120                 goto out_unlock;
 121
 122         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 123         if (err == 0)
 124                 truncate_pagecache_range(inode, offset, (offset + len) -1);
 125         if (err == -EOPNOTSUPP)
 126                 NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
 127 out_unlock:
 128         inode_unlock(inode);
 129         return err;
 130 }
 131
 132 static ssize_t _nfs42_proc_copy(struct file *src,
 133                                 struct nfs_lock_context *src_lock,
 134                                 struct file *dst,
 135                                 struct nfs_lock_context *dst_lock,
 136                                 struct nfs42_copy_args *args,
 137                                 struct nfs42_copy_res *res)
 138 {
 139         struct rpc_message msg = {
 140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
 141                 .rpc_argp = args,
 142                 .rpc_resp = res,
 143         };
 144         struct inode *dst_inode = file_inode(dst);
 145         struct nfs_server *server = NFS_SERVER(dst_inode);
 146         loff_t pos_src = args->src_pos;
 147         loff_t pos_dst = args->dst_pos;
 148         size_t count = args->count;
 149         ssize_t status;
 150
 151         status = nfs4_set_rw_stateid(&args->src_stateid, src_lock->open_context,
 152                                      src_lock, FMODE_READ);
 153         if (status)
 154                 return status;
 155
 156         status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping,
 157                         pos_src, pos_src + (loff_t)count - 1);
 158         if (status)
 159                 return status;
 160
 161         status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context,
 162                                      dst_lock, FMODE_WRITE);
 163         if (status)
 164                 return status;
 165
 166         status = nfs_sync_inode(dst_inode);
 167         if (status)
 168                 return status;
 169
 170         res->commit_res.verf = kzalloc(sizeof(struct nfs_writeverf), GFP_NOFS);
 171         if (!res->commit_res.verf)
 172                 return -ENOMEM;
 173         status = nfs4_call_sync(server->client, server, &msg,
 174                                 &args->seq_args, &res->seq_res, 0);
 175         if (status == -ENOTSUPP)
 176                 server->caps &= ~NFS_CAP_COPY;
 177         if (status)
 178                 goto out;
 179
 180         if (nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
 181                                     &res->commit_res.verf->verifier)) {
 182                 status = -EAGAIN;
 183                 goto out;
 184         }
 185
 186         truncate_pagecache_range(dst_inode, pos_dst,
 187                                  pos_dst + res->write_res.count);
 188
 189         status = res->write_res.count;
 190 out:
 191         kfree(res->commit_res.verf);
 192         return status;
 193 }
 194
 195 ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 196                         struct file *dst, loff_t pos_dst,
 197                         size_t count)
 198 {
 199         struct nfs_server *server = NFS_SERVER(file_inode(dst));
 200         struct nfs_lock_context *src_lock;
 201         struct nfs_lock_context *dst_lock;
 202         struct nfs42_copy_args args = {
 203                 .src_fh         = NFS_FH(file_inode(src)),
 204                 .src_pos        = pos_src,
 205                 .dst_fh         = NFS_FH(file_inode(dst)),
 206                 .dst_pos        = pos_dst,
 207                 .count          = count,
 208         };
 209         struct nfs42_copy_res res;
 210         struct nfs4_exception src_exception = {
 211                 .inode          = file_inode(src),
 212                 .stateid        = &args.src_stateid,
 213         };
 214         struct nfs4_exception dst_exception = {
 215                 .inode          = file_inode(dst),
 216                 .stateid        = &args.dst_stateid,
 217         };
 218         ssize_t err, err2;
 219
 220         if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
 221                 return -EOPNOTSUPP;
 222
 223         src_lock = nfs_get_lock_context(nfs_file_open_context(src));
 224         if (IS_ERR(src_lock))
 225                 return PTR_ERR(src_lock);
 226
 227         src_exception.state = src_lock->open_context->state;
 228
 229         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
 230         if (IS_ERR(dst_lock)) {
 231                 err = PTR_ERR(dst_lock);
 232                 goto out_put_src_lock;
 233         }
 234
 235         dst_exception.state = dst_lock->open_context->state;
 236
 237         do {
 238                 inode_lock(file_inode(dst));
 239                 err = _nfs42_proc_copy(src, src_lock,
 240                                 dst, dst_lock,
 241                                 &args, &res);
 242                 inode_unlock(file_inode(dst));
 243
 244                 if (err >= 0)
 245                         break;
 246                 if (err == -ENOTSUPP) {
 247                         err = -EOPNOTSUPP;
 248                         break;
 249                 } if (err == -EAGAIN) {
 250                         dst_exception.retry = 1;
 251                         continue;
 252                 }
 253
 254                 err2 = nfs4_handle_exception(server, err, &src_exception);
 255                 err  = nfs4_handle_exception(server, err, &dst_exception);
 256                 if (!err)
 257                         err = err2;
 258         } while (src_exception.retry || dst_exception.retry);
 259
 260         nfs_put_lock_context(dst_lock);
 261 out_put_src_lock:
 262         nfs_put_lock_context(src_lock);
 263         return err;
 264 }
 265
 266 static loff_t _nfs42_proc_llseek(struct file *filep,
 267                 struct nfs_lock_context *lock, loff_t offset, int whence)
 268 {
 269         struct inode *inode = file_inode(filep);
 270         struct nfs42_seek_args args = {
 271                 .sa_fh          = NFS_FH(inode),
 272                 .sa_offset      = offset,
 273                 .sa_what        = (whence == SEEK_HOLE) ?
 274                                         NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
 275         };
 276         struct nfs42_seek_res res;
 277         struct rpc_message msg = {
 278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
 279                 .rpc_argp = &args,
 280                 .rpc_resp = &res,
 281         };
 282         struct nfs_server *server = NFS_SERVER(inode);
 283         int status;
 284
 285         if (!nfs_server_capable(inode, NFS_CAP_SEEK))
 286                 return -ENOTSUPP;
 287
 288         status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
 289                         lock, FMODE_READ);
 290         if (status)
 291                 return status;
 292
 293         status = nfs_filemap_write_and_wait_range(inode->i_mapping,
 294                         offset, LLONG_MAX);
 295         if (status)
 296                 return status;
 297
 298         status = nfs4_call_sync(server->client, server, &msg,
 299                                 &args.seq_args, &res.seq_res, 0);
 300         if (status == -ENOTSUPP)
 301                 server->caps &= ~NFS_CAP_SEEK;
 302         if (status)
 303                 return status;
 304
 305         return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
 306 }
 307
 308 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 309 {
 310         struct nfs_server *server = NFS_SERVER(file_inode(filep));
 311         struct nfs4_exception exception = { };
 312         struct nfs_lock_context *lock;
 313         loff_t err;
 314
 315         lock = nfs_get_lock_context(nfs_file_open_context(filep));
 316         if (IS_ERR(lock))
 317                 return PTR_ERR(lock);
 318
 319         exception.inode = file_inode(filep);
 320         exception.state = lock->open_context->state;
 321
 322         do {
 323                 err = _nfs42_proc_llseek(filep, lock, offset, whence);
 324                 if (err >= 0)
 325                         break;
 326                 if (err == -ENOTSUPP) {
 327                         err = -EOPNOTSUPP;
 328                         break;
 329                 }
 330                 err = nfs4_handle_exception(server, err, &exception);
 331         } while (exception.retry);
 332
 333         nfs_put_lock_context(lock);
 334         return err;
 335 }
 336
 337
 338 static void
 339 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
 340 {
 341         struct nfs42_layoutstat_data *data = calldata;
 342         struct inode *inode = data->inode;
 343         struct nfs_server *server = NFS_SERVER(inode);
 344         struct pnfs_layout_hdr *lo;
 345
 346         spin_lock(&inode->i_lock);
 347         lo = NFS_I(inode)->layout;
 348         if (!pnfs_layout_is_valid(lo)) {
 349                 spin_unlock(&inode->i_lock);
 350                 rpc_exit(task, 0);
 351                 return;
 352         }
 353         nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
 354         spin_unlock(&inode->i_lock);
 355         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
 356                             &data->res.seq_res, task);
 357 }
 358
 359 static void
 360 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
 361 {
 362         struct nfs42_layoutstat_data *data = calldata;
 363         struct inode *inode = data->inode;
 364         struct pnfs_layout_hdr *lo;
 365
 366         if (!nfs4_sequence_done(task, &data->res.seq_res))
 367                 return;
 368
 369         switch (task->tk_status) {
 370         case 0:
 371                 break;
 372         case -NFS4ERR_EXPIRED:
 373         case -NFS4ERR_ADMIN_REVOKED:
 374         case -NFS4ERR_DELEG_REVOKED:
 375         case -NFS4ERR_STALE_STATEID:
 376         case -NFS4ERR_BAD_STATEID:
 377                 spin_lock(&inode->i_lock);
 378                 lo = NFS_I(inode)->layout;
 379                 if (pnfs_layout_is_valid(lo) &&
 380                     nfs4_stateid_match(&data->args.stateid,
 381                                              &lo->plh_stateid)) {
 382                         LIST_HEAD(head);
 383
 384                         /*
 385                          * Mark the bad layout state as invalid, then retry
 386                          * with the current stateid.
 387                          */
 388                         pnfs_mark_layout_stateid_invalid(lo, &head);
 389                         spin_unlock(&inode->i_lock);
 390                         pnfs_free_lseg_list(&head);
 391                         nfs_commit_inode(inode, 0);
 392                 } else
 393                         spin_unlock(&inode->i_lock);
 394                 break;
 395         case -NFS4ERR_OLD_STATEID:
 396                 spin_lock(&inode->i_lock);
 397                 lo = NFS_I(inode)->layout;
 398                 if (pnfs_layout_is_valid(lo) &&
 399                     nfs4_stateid_match_other(&data->args.stateid,
 400                                         &lo->plh_stateid)) {
 401                         /* Do we need to delay before resending? */
 402                         if (!nfs4_stateid_is_newer(&lo->plh_stateid,
 403                                                 &data->args.stateid))
 404                                 rpc_delay(task, HZ);
 405                         rpc_restart_call_prepare(task);
 406                 }
 407                 spin_unlock(&inode->i_lock);
 408                 break;
 409         case -ENOTSUPP:
 410         case -EOPNOTSUPP:
 411                 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
 412         }
 413 }
 414
 415 static void
 416 nfs42_layoutstat_release(void *calldata)
 417 {
 418         struct nfs42_layoutstat_data *data = calldata;
 419         struct nfs42_layoutstat_devinfo *devinfo = data->args.devinfo;
 420         int i;
 421
 422         for (i = 0; i < data->args.num_dev; i++) {
 423                 if (devinfo[i].ld_private.ops && devinfo[i].ld_private.ops->free)
 424                         devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
 425         }
 426
 427         pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
 428         smp_mb__before_atomic();
 429         clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
 430         smp_mb__after_atomic();
 431         nfs_iput_and_deactive(data->inode);
 432         kfree(data->args.devinfo);
 433         kfree(data);
 434 }
 435
 436 static const struct rpc_call_ops nfs42_layoutstat_ops = {
 437         .rpc_call_prepare = nfs42_layoutstat_prepare,
 438         .rpc_call_done = nfs42_layoutstat_done,
 439         .rpc_release = nfs42_layoutstat_release,
 440 };
 441
 442 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
 443                                    struct nfs42_layoutstat_data *data)
 444 {
 445         struct rpc_message msg = {
 446                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
 447                 .rpc_argp = &data->args,
 448                 .rpc_resp = &data->res,
 449         };
 450         struct rpc_task_setup task_setup = {
 451                 .rpc_client = server->client,
 452                 .rpc_message = &msg,
 453                 .callback_ops = &nfs42_layoutstat_ops,
 454                 .callback_data = data,
 455                 .flags = RPC_TASK_ASYNC,
 456         };
 457         struct rpc_task *task;
 458
 459         data->inode = nfs_igrab_and_active(data->args.inode);
 460         if (!data->inode) {
 461                 nfs42_layoutstat_release(data);
 462                 return -EAGAIN;
 463         }
 464         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
 465         task = rpc_run_task(&task_setup);
 466         if (IS_ERR(task))
 467                 return PTR_ERR(task);
 468         rpc_put_task(task);
 469         return 0;
 470 }
 471
 472 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
 473                 struct file *dst_f, struct nfs_lock_context *src_lock,
 474                 struct nfs_lock_context *dst_lock, loff_t src_offset,
 475                 loff_t dst_offset, loff_t count)
 476 {
 477         struct inode *src_inode = file_inode(src_f);
 478         struct inode *dst_inode = file_inode(dst_f);
 479         struct nfs_server *server = NFS_SERVER(dst_inode);
 480         struct nfs42_clone_args args = {
 481                 .src_fh = NFS_FH(src_inode),
 482                 .dst_fh = NFS_FH(dst_inode),
 483                 .src_offset = src_offset,
 484                 .dst_offset = dst_offset,
 485                 .count = count,
 486                 .dst_bitmask = server->cache_consistency_bitmask,
 487         };
 488         struct nfs42_clone_res res = {
 489                 .server = server,
 490         };
 491         int status;
 492
 493         msg->rpc_argp = &args;
 494         msg->rpc_resp = &res;
 495
 496         status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 497                         src_lock, FMODE_READ);
 498         if (status)
 499                 return status;
 500
 501         status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 502                         dst_lock, FMODE_WRITE);
 503         if (status)
 504                 return status;
 505
 506         res.dst_fattr = nfs_alloc_fattr();
 507         if (!res.dst_fattr)
 508                 return -ENOMEM;
 509
 510         status = nfs4_call_sync(server->client, server, msg,
 511                                 &args.seq_args, &res.seq_res, 0);
 512         if (status == 0)
 513                 status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
 514
 515         kfree(res.dst_fattr);
 516         return status;
 517 }
 518
 519 int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
 520                      loff_t src_offset, loff_t dst_offset, loff_t count)
 521 {
 522         struct rpc_message msg = {
 523                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
 524         };
 525         struct inode *inode = file_inode(src_f);
 526         struct nfs_server *server = NFS_SERVER(file_inode(src_f));
 527         struct nfs_lock_context *src_lock;
 528         struct nfs_lock_context *dst_lock;
 529         struct nfs4_exception src_exception = { };
 530         struct nfs4_exception dst_exception = { };
 531         int err, err2;
 532
 533         if (!nfs_server_capable(inode, NFS_CAP_CLONE))
 534                 return -EOPNOTSUPP;
 535
 536         src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
 537         if (IS_ERR(src_lock))
 538                 return PTR_ERR(src_lock);
 539
 540         src_exception.inode = file_inode(src_f);
 541         src_exception.state = src_lock->open_context->state;
 542
 543         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
 544         if (IS_ERR(dst_lock)) {
 545                 err = PTR_ERR(dst_lock);
 546                 goto out_put_src_lock;
 547         }
 548
 549         dst_exception.inode = file_inode(dst_f);
 550         dst_exception.state = dst_lock->open_context->state;
 551
 552         do {
 553                 err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
 554                                         src_offset, dst_offset, count);
 555                 if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
 556                         NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
 557                         err = -EOPNOTSUPP;
 558                         break;
 559                 }
 560
 561                 err2 = nfs4_handle_exception(server, err, &src_exception);
 562                 err = nfs4_handle_exception(server, err, &dst_exception);
 563                 if (!err)
 564                         err = err2;
 565         } while (src_exception.retry || dst_exception.retry);
 566
 567         nfs_put_lock_context(dst_lock);
 568 out_put_src_lock:
 569         nfs_put_lock_context(src_lock);
 570         return err;
 571 }