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 "internal.h"
  16
  17 #define NFSDBG_FACILITY NFSDBG_PROC
  18
  19 static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  20                 struct nfs_lock_context *lock, loff_t offset, loff_t len)
  21 {
  22         struct inode *inode = file_inode(filep);
  23         struct nfs_server *server = NFS_SERVER(inode);
  24         struct nfs42_falloc_args args = {
  25                 .falloc_fh      = NFS_FH(inode),
  26                 .falloc_offset  = offset,
  27                 .falloc_length  = len,
  28                 .falloc_bitmask = server->cache_consistency_bitmask,
  29         };
  30         struct nfs42_falloc_res res = {
  31                 .falloc_server  = server,
  32         };
  33         int status;
  34
  35         msg->rpc_argp = &args;
  36         msg->rpc_resp = &res;
  37
  38         status = nfs4_set_rw_stateid(&args.falloc_stateid, lock->open_context,
  39                         lock, FMODE_WRITE);
  40         if (status)
  41                 return status;
  42
  43         res.falloc_fattr = nfs_alloc_fattr();
  44         if (!res.falloc_fattr)
  45                 return -ENOMEM;
  46
  47         status = nfs4_call_sync(server->client, server, msg,
  48                                 &args.seq_args, &res.seq_res, 0);
  49         if (status == 0)
  50                 status = nfs_post_op_update_inode(inode, res.falloc_fattr);
  51
  52         kfree(res.falloc_fattr);
  53         return status;
  54 }
  55
  56 static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
  57                                 loff_t offset, loff_t len)
  58 {
  59         struct nfs_server *server = NFS_SERVER(file_inode(filep));
  60         struct nfs4_exception exception = { };
  61         struct nfs_lock_context *lock;
  62         int err;
  63
  64         lock = nfs_get_lock_context(nfs_file_open_context(filep));
  65         if (IS_ERR(lock))
  66                 return PTR_ERR(lock);
  67
  68         exception.inode = file_inode(filep);
  69         exception.state = lock->open_context->state;
  70
  71         do {
  72                 err = _nfs42_proc_fallocate(msg, filep, lock, offset, len);
  73                 if (err == -ENOTSUPP) {
  74                         err = -EOPNOTSUPP;
  75                         break;
  76                 }
  77                 err = nfs4_handle_exception(server, err, &exception);
  78         } while (exception.retry);
  79
  80         nfs_put_lock_context(lock);
  81         return err;
  82 }
  83
  84 int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
  85 {
  86         struct rpc_message msg = {
  87                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
  88         };
  89         struct inode *inode = file_inode(filep);
  90         int err;
  91
  92         if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
  93                 return -EOPNOTSUPP;
  94
  95         inode_lock(inode);
  96
  97         err = nfs42_proc_fallocate(&msg, filep, offset, len);
  98         if (err == -EOPNOTSUPP)
  99                 NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
 100
 101         inode_unlock(inode);
 102         return err;
 103 }
 104
 105 int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
 106 {
 107         struct rpc_message msg = {
 108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
 109         };
 110         struct inode *inode = file_inode(filep);
 111         int err;
 112
 113         if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
 114                 return -EOPNOTSUPP;
 115
 116         inode_lock(inode);
 117         err = nfs_sync_inode(inode);
 118         if (err)
 119                 goto out_unlock;
 120
 121         err = nfs42_proc_fallocate(&msg, filep, offset, len);
 122         if (err == 0)
 123                 truncate_pagecache_range(inode, offset, (offset + len) -1);
 124         if (err == -EOPNOTSUPP)
 125                 NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
 126 out_unlock:
 127         inode_unlock(inode);
 128         return err;
 129 }
 130
 131 static ssize_t _nfs42_proc_copy(struct file *src,
 132                                 struct nfs_lock_context *src_lock,
 133                                 struct file *dst,
 134                                 struct nfs_lock_context *dst_lock,
 135                                 struct nfs42_copy_args *args,
 136                                 struct nfs42_copy_res *res)
 137 {
 138         struct rpc_message msg = {
 139                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
 140                 .rpc_argp = args,
 141                 .rpc_resp = res,
 142         };
 143         struct inode *dst_inode = file_inode(dst);
 144         struct nfs_server *server = NFS_SERVER(dst_inode);
 145         loff_t pos_src = args->src_pos;
 146         loff_t pos_dst = args->dst_pos;
 147         size_t count = args->count;
 148         int status;
 149
 150         status = nfs4_set_rw_stateid(&args->src_stateid, src_lock->open_context,
 151                                      src_lock, FMODE_READ);
 152         if (status)
 153                 return status;
 154
 155         status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping,
 156                         pos_src, pos_src + (loff_t)count - 1);
 157         if (status)
 158                 return status;
 159
 160         status = nfs4_set_rw_stateid(&args->dst_stateid, dst_lock->open_context,
 161                                      dst_lock, FMODE_WRITE);
 162         if (status)
 163                 return status;
 164
 165         status = nfs_sync_inode(dst_inode);
 166         if (status)
 167                 return status;
 168
 169         status = nfs4_call_sync(server->client, server, &msg,
 170                                 &args->seq_args, &res->seq_res, 0);
 171         if (status == -ENOTSUPP)
 172                 server->caps &= ~NFS_CAP_COPY;
 173         if (status)
 174                 return status;
 175
 176         if (res->write_res.verifier.committed != NFS_FILE_SYNC) {
 177                 status = nfs_commit_file(dst, &res->write_res.verifier.verifier);
 178                 if (status)
 179                         return status;
 180         }
 181
 182         truncate_pagecache_range(dst_inode, pos_dst,
 183                                  pos_dst + res->write_res.count);
 184
 185         return res->write_res.count;
 186 }
 187
 188 ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 189                         struct file *dst, loff_t pos_dst,
 190                         size_t count)
 191 {
 192         struct nfs_server *server = NFS_SERVER(file_inode(dst));
 193         struct nfs_lock_context *src_lock;
 194         struct nfs_lock_context *dst_lock;
 195         struct nfs42_copy_args args = {
 196                 .src_fh         = NFS_FH(file_inode(src)),
 197                 .src_pos        = pos_src,
 198                 .dst_fh         = NFS_FH(file_inode(dst)),
 199                 .dst_pos        = pos_dst,
 200                 .count          = count,
 201         };
 202         struct nfs42_copy_res res;
 203         struct nfs4_exception src_exception = {
 204                 .inode          = file_inode(src),
 205                 .stateid        = &args.src_stateid,
 206         };
 207         struct nfs4_exception dst_exception = {
 208                 .inode          = file_inode(dst),
 209                 .stateid        = &args.dst_stateid,
 210         };
 211         ssize_t err, err2;
 212
 213         if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
 214                 return -EOPNOTSUPP;
 215
 216         src_lock = nfs_get_lock_context(nfs_file_open_context(src));
 217         if (IS_ERR(src_lock))
 218                 return PTR_ERR(src_lock);
 219
 220         src_exception.state = src_lock->open_context->state;
 221
 222         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
 223         if (IS_ERR(dst_lock)) {
 224                 err = PTR_ERR(dst_lock);
 225                 goto out_put_src_lock;
 226         }
 227
 228         dst_exception.state = dst_lock->open_context->state;
 229
 230         do {
 231                 inode_lock(file_inode(dst));
 232                 err = _nfs42_proc_copy(src, src_lock,
 233                                 dst, dst_lock,
 234                                 &args, &res);
 235                 inode_unlock(file_inode(dst));
 236
 237                 if (err >= 0)
 238                         break;
 239                 if (err == -ENOTSUPP) {
 240                         err = -EOPNOTSUPP;
 241                         break;
 242                 }
 243
 244                 err2 = nfs4_handle_exception(server, err, &src_exception);
 245                 err  = nfs4_handle_exception(server, err, &dst_exception);
 246                 if (!err)
 247                         err = err2;
 248         } while (src_exception.retry || dst_exception.retry);
 249
 250         nfs_put_lock_context(dst_lock);
 251 out_put_src_lock:
 252         nfs_put_lock_context(src_lock);
 253         return err;
 254 }
 255
 256 static loff_t _nfs42_proc_llseek(struct file *filep,
 257                 struct nfs_lock_context *lock, loff_t offset, int whence)
 258 {
 259         struct inode *inode = file_inode(filep);
 260         struct nfs42_seek_args args = {
 261                 .sa_fh          = NFS_FH(inode),
 262                 .sa_offset      = offset,
 263                 .sa_what        = (whence == SEEK_HOLE) ?
 264                                         NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
 265         };
 266         struct nfs42_seek_res res;
 267         struct rpc_message msg = {
 268                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
 269                 .rpc_argp = &args,
 270                 .rpc_resp = &res,
 271         };
 272         struct nfs_server *server = NFS_SERVER(inode);
 273         int status;
 274
 275         if (!nfs_server_capable(inode, NFS_CAP_SEEK))
 276                 return -ENOTSUPP;
 277
 278         status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
 279                         lock, FMODE_READ);
 280         if (status)
 281                 return status;
 282
 283         status = nfs_filemap_write_and_wait_range(inode->i_mapping,
 284                         offset, LLONG_MAX);
 285         if (status)
 286                 return status;
 287
 288         status = nfs4_call_sync(server->client, server, &msg,
 289                                 &args.seq_args, &res.seq_res, 0);
 290         if (status == -ENOTSUPP)
 291                 server->caps &= ~NFS_CAP_SEEK;
 292         if (status)
 293                 return status;
 294
 295         return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
 296 }
 297
 298 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 299 {
 300         struct nfs_server *server = NFS_SERVER(file_inode(filep));
 301         struct nfs4_exception exception = { };
 302         struct nfs_lock_context *lock;
 303         loff_t err;
 304
 305         lock = nfs_get_lock_context(nfs_file_open_context(filep));
 306         if (IS_ERR(lock))
 307                 return PTR_ERR(lock);
 308
 309         exception.inode = file_inode(filep);
 310         exception.state = lock->open_context->state;
 311
 312         do {
 313                 err = _nfs42_proc_llseek(filep, lock, offset, whence);
 314                 if (err >= 0)
 315                         break;
 316                 if (err == -ENOTSUPP) {
 317                         err = -EOPNOTSUPP;
 318                         break;
 319                 }
 320                 err = nfs4_handle_exception(server, err, &exception);
 321         } while (exception.retry);
 322
 323         nfs_put_lock_context(lock);
 324         return err;
 325 }
 326
 327
 328 static void
 329 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
 330 {
 331         struct nfs42_layoutstat_data *data = calldata;
 332         struct inode *inode = data->inode;
 333         struct nfs_server *server = NFS_SERVER(inode);
 334         struct pnfs_layout_hdr *lo;
 335
 336         spin_lock(&inode->i_lock);
 337         lo = NFS_I(inode)->layout;
 338         if (!pnfs_layout_is_valid(lo)) {
 339                 spin_unlock(&inode->i_lock);
 340                 rpc_exit(task, 0);
 341                 return;
 342         }
 343         nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
 344         spin_unlock(&inode->i_lock);
 345         nfs41_setup_sequence(nfs4_get_session(server), &data->args.seq_args,
 346                              &data->res.seq_res, task);
 347
 348 }
 349
 350 static void
 351 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
 352 {
 353         struct nfs42_layoutstat_data *data = calldata;
 354         struct inode *inode = data->inode;
 355         struct pnfs_layout_hdr *lo;
 356
 357         if (!nfs4_sequence_done(task, &data->res.seq_res))
 358                 return;
 359
 360         switch (task->tk_status) {
 361         case 0:
 362                 break;
 363         case -NFS4ERR_EXPIRED:
 364         case -NFS4ERR_ADMIN_REVOKED:
 365         case -NFS4ERR_DELEG_REVOKED:
 366         case -NFS4ERR_STALE_STATEID:
 367         case -NFS4ERR_BAD_STATEID:
 368                 spin_lock(&inode->i_lock);
 369                 lo = NFS_I(inode)->layout;
 370                 if (pnfs_layout_is_valid(lo) &&
 371                     nfs4_stateid_match(&data->args.stateid,
 372                                              &lo->plh_stateid)) {
 373                         LIST_HEAD(head);
 374
 375                         /*
 376                          * Mark the bad layout state as invalid, then retry
 377                          * with the current stateid.
 378                          */
 379                         pnfs_mark_layout_stateid_invalid(lo, &head);
 380                         spin_unlock(&inode->i_lock);
 381                         pnfs_free_lseg_list(&head);
 382                 } else
 383                         spin_unlock(&inode->i_lock);
 384                 break;
 385         case -NFS4ERR_OLD_STATEID:
 386                 spin_lock(&inode->i_lock);
 387                 lo = NFS_I(inode)->layout;
 388                 if (pnfs_layout_is_valid(lo) &&
 389                     nfs4_stateid_match_other(&data->args.stateid,
 390                                         &lo->plh_stateid)) {
 391                         /* Do we need to delay before resending? */
 392                         if (!nfs4_stateid_is_newer(&lo->plh_stateid,
 393                                                 &data->args.stateid))
 394                                 rpc_delay(task, HZ);
 395                         rpc_restart_call_prepare(task);
 396                 }
 397                 spin_unlock(&inode->i_lock);
 398                 break;
 399         case -ENOTSUPP:
 400         case -EOPNOTSUPP:
 401                 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
 402         }
 403
 404         dprintk("%s server returns %d\n", __func__, task->tk_status);
 405 }
 406
 407 static void
 408 nfs42_layoutstat_release(void *calldata)
 409 {
 410         struct nfs42_layoutstat_data *data = calldata;
 411         struct nfs42_layoutstat_devinfo *devinfo = data->args.devinfo;
 412         int i;
 413
 414         for (i = 0; i < data->args.num_dev; i++) {
 415                 if (devinfo[i].ld_private.ops && devinfo[i].ld_private.ops->free)
 416                         devinfo[i].ld_private.ops->free(&devinfo[i].ld_private);
 417         }
 418
 419         pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
 420         smp_mb__before_atomic();
 421         clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
 422         smp_mb__after_atomic();
 423         nfs_iput_and_deactive(data->inode);
 424         kfree(data->args.devinfo);
 425         kfree(data);
 426 }
 427
 428 static const struct rpc_call_ops nfs42_layoutstat_ops = {
 429         .rpc_call_prepare = nfs42_layoutstat_prepare,
 430         .rpc_call_done = nfs42_layoutstat_done,
 431         .rpc_release = nfs42_layoutstat_release,
 432 };
 433
 434 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
 435                                    struct nfs42_layoutstat_data *data)
 436 {
 437         struct rpc_message msg = {
 438                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
 439                 .rpc_argp = &data->args,
 440                 .rpc_resp = &data->res,
 441         };
 442         struct rpc_task_setup task_setup = {
 443                 .rpc_client = server->client,
 444                 .rpc_message = &msg,
 445                 .callback_ops = &nfs42_layoutstat_ops,
 446                 .callback_data = data,
 447                 .flags = RPC_TASK_ASYNC,
 448         };
 449         struct rpc_task *task;
 450
 451         data->inode = nfs_igrab_and_active(data->args.inode);
 452         if (!data->inode) {
 453                 nfs42_layoutstat_release(data);
 454                 return -EAGAIN;
 455         }
 456         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
 457         task = rpc_run_task(&task_setup);
 458         if (IS_ERR(task))
 459                 return PTR_ERR(task);
 460         rpc_put_task(task);
 461         return 0;
 462 }
 463
 464 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
 465                 struct file *dst_f, struct nfs_lock_context *src_lock,
 466                 struct nfs_lock_context *dst_lock, loff_t src_offset,
 467                 loff_t dst_offset, loff_t count)
 468 {
 469         struct inode *src_inode = file_inode(src_f);
 470         struct inode *dst_inode = file_inode(dst_f);
 471         struct nfs_server *server = NFS_SERVER(dst_inode);
 472         struct nfs42_clone_args args = {
 473                 .src_fh = NFS_FH(src_inode),
 474                 .dst_fh = NFS_FH(dst_inode),
 475                 .src_offset = src_offset,
 476                 .dst_offset = dst_offset,
 477                 .count = count,
 478                 .dst_bitmask = server->cache_consistency_bitmask,
 479         };
 480         struct nfs42_clone_res res = {
 481                 .server = server,
 482         };
 483         int status;
 484
 485         msg->rpc_argp = &args;
 486         msg->rpc_resp = &res;
 487
 488         status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 489                         src_lock, FMODE_READ);
 490         if (status)
 491                 return status;
 492
 493         status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 494                         dst_lock, FMODE_WRITE);
 495         if (status)
 496                 return status;
 497
 498         res.dst_fattr = nfs_alloc_fattr();
 499         if (!res.dst_fattr)
 500                 return -ENOMEM;
 501
 502         status = nfs4_call_sync(server->client, server, msg,
 503                                 &args.seq_args, &res.seq_res, 0);
 504         if (status == 0)
 505                 status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
 506
 507         kfree(res.dst_fattr);
 508         return status;
 509 }
 510
 511 int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
 512                      loff_t src_offset, loff_t dst_offset, loff_t count)
 513 {
 514         struct rpc_message msg = {
 515                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
 516         };
 517         struct inode *inode = file_inode(src_f);
 518         struct nfs_server *server = NFS_SERVER(file_inode(src_f));
 519         struct nfs_lock_context *src_lock;
 520         struct nfs_lock_context *dst_lock;
 521         struct nfs4_exception src_exception = { };
 522         struct nfs4_exception dst_exception = { };
 523         int err, err2;
 524
 525         if (!nfs_server_capable(inode, NFS_CAP_CLONE))
 526                 return -EOPNOTSUPP;
 527
 528         src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
 529         if (IS_ERR(src_lock))
 530                 return PTR_ERR(src_lock);
 531
 532         src_exception.inode = file_inode(src_f);
 533         src_exception.state = src_lock->open_context->state;
 534
 535         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
 536         if (IS_ERR(dst_lock)) {
 537                 err = PTR_ERR(dst_lock);
 538                 goto out_put_src_lock;
 539         }
 540
 541         dst_exception.inode = file_inode(dst_f);
 542         dst_exception.state = dst_lock->open_context->state;
 543
 544         do {
 545                 err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
 546                                         src_offset, dst_offset, count);
 547                 if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
 548                         NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
 549                         err = -EOPNOTSUPP;
 550                         break;
 551                 }
 552
 553                 err2 = nfs4_handle_exception(server, err, &src_exception);
 554                 err = nfs4_handle_exception(server, err, &dst_exception);
 555                 if (!err)
 556                         err = err2;
 557         } while (src_exception.retry || dst_exception.retry);
 558
 559         nfs_put_lock_context(dst_lock);
 560 out_put_src_lock:
 561         nfs_put_lock_context(src_lock);
 562         return err;
 563 }