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, loff_t pos_src,
 132                                 struct nfs_lock_context *src_lock,
 133                                 struct file *dst, loff_t pos_dst,
 134                                 struct nfs_lock_context *dst_lock,
 135                                 size_t count)
 136 {
 137         struct nfs42_copy_args args = {
 138                 .src_fh         = NFS_FH(file_inode(src)),
 139                 .src_pos        = pos_src,
 140                 .dst_fh         = NFS_FH(file_inode(dst)),
 141                 .dst_pos        = pos_dst,
 142                 .count          = count,
 143         };
 144         struct nfs42_copy_res res;
 145         struct rpc_message msg = {
 146                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COPY],
 147                 .rpc_argp = &args,
 148                 .rpc_resp = &res,
 149         };
 150         struct inode *dst_inode = file_inode(dst);
 151         struct nfs_server *server = NFS_SERVER(dst_inode);
 152         int status;
 153
 154         status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 155                                      src_lock, FMODE_READ);
 156         if (status)
 157                 return status;
 158
 159         status = nfs_filemap_write_and_wait_range(file_inode(src)->i_mapping,
 160                         pos_src, pos_src + (loff_t)count - 1);
 161         if (status)
 162                 return status;
 163
 164         status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 165                                      dst_lock, FMODE_WRITE);
 166         if (status)
 167                 return status;
 168
 169         status = nfs_sync_inode(dst_inode);
 170         if (status)
 171                 return status;
 172
 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                 return status;
 179
 180         if (res.write_res.verifier.committed != NFS_FILE_SYNC) {
 181                 status = nfs_commit_file(dst, &res.write_res.verifier.verifier);
 182                 if (status)
 183                         return status;
 184         }
 185
 186         truncate_pagecache_range(dst_inode, pos_dst,
 187                                  pos_dst + res.write_res.count);
 188
 189         return res.write_res.count;
 190 }
 191
 192 ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
 193                         struct file *dst, loff_t pos_dst,
 194                         size_t count)
 195 {
 196         struct nfs_server *server = NFS_SERVER(file_inode(dst));
 197         struct nfs_lock_context *src_lock;
 198         struct nfs_lock_context *dst_lock;
 199         struct nfs4_exception src_exception = { };
 200         struct nfs4_exception dst_exception = { };
 201         ssize_t err, err2;
 202
 203         if (!nfs_server_capable(file_inode(dst), NFS_CAP_COPY))
 204                 return -EOPNOTSUPP;
 205
 206         src_lock = nfs_get_lock_context(nfs_file_open_context(src));
 207         if (IS_ERR(src_lock))
 208                 return PTR_ERR(src_lock);
 209
 210         src_exception.inode = file_inode(src);
 211         src_exception.state = src_lock->open_context->state;
 212
 213         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst));
 214         if (IS_ERR(dst_lock)) {
 215                 err = PTR_ERR(dst_lock);
 216                 goto out_put_src_lock;
 217         }
 218
 219         dst_exception.inode = file_inode(dst);
 220         dst_exception.state = dst_lock->open_context->state;
 221
 222         do {
 223                 inode_lock(file_inode(dst));
 224                 err = _nfs42_proc_copy(src, pos_src, src_lock,
 225                                        dst, pos_dst, dst_lock, count);
 226                 inode_unlock(file_inode(dst));
 227
 228                 if (err == -ENOTSUPP) {
 229                         err = -EOPNOTSUPP;
 230                         break;
 231                 }
 232
 233                 err2 = nfs4_handle_exception(server, err, &src_exception);
 234                 err  = nfs4_handle_exception(server, err, &dst_exception);
 235                 if (!err)
 236                         err = err2;
 237         } while (src_exception.retry || dst_exception.retry);
 238
 239         nfs_put_lock_context(dst_lock);
 240 out_put_src_lock:
 241         nfs_put_lock_context(src_lock);
 242         return err;
 243 }
 244
 245 static loff_t _nfs42_proc_llseek(struct file *filep,
 246                 struct nfs_lock_context *lock, loff_t offset, int whence)
 247 {
 248         struct inode *inode = file_inode(filep);
 249         struct nfs42_seek_args args = {
 250                 .sa_fh          = NFS_FH(inode),
 251                 .sa_offset      = offset,
 252                 .sa_what        = (whence == SEEK_HOLE) ?
 253                                         NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
 254         };
 255         struct nfs42_seek_res res;
 256         struct rpc_message msg = {
 257                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
 258                 .rpc_argp = &args,
 259                 .rpc_resp = &res,
 260         };
 261         struct nfs_server *server = NFS_SERVER(inode);
 262         int status;
 263
 264         if (!nfs_server_capable(inode, NFS_CAP_SEEK))
 265                 return -ENOTSUPP;
 266
 267         status = nfs4_set_rw_stateid(&args.sa_stateid, lock->open_context,
 268                         lock, FMODE_READ);
 269         if (status)
 270                 return status;
 271
 272         status = nfs_filemap_write_and_wait_range(inode->i_mapping,
 273                         offset, LLONG_MAX);
 274         if (status)
 275                 return status;
 276
 277         status = nfs4_call_sync(server->client, server, &msg,
 278                                 &args.seq_args, &res.seq_res, 0);
 279         if (status == -ENOTSUPP)
 280                 server->caps &= ~NFS_CAP_SEEK;
 281         if (status)
 282                 return status;
 283
 284         return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
 285 }
 286
 287 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
 288 {
 289         struct nfs_server *server = NFS_SERVER(file_inode(filep));
 290         struct nfs4_exception exception = { };
 291         struct nfs_lock_context *lock;
 292         loff_t err;
 293
 294         lock = nfs_get_lock_context(nfs_file_open_context(filep));
 295         if (IS_ERR(lock))
 296                 return PTR_ERR(lock);
 297
 298         exception.inode = file_inode(filep);
 299         exception.state = lock->open_context->state;
 300
 301         do {
 302                 err = _nfs42_proc_llseek(filep, lock, offset, whence);
 303                 if (err >= 0)
 304                         break;
 305                 if (err == -ENOTSUPP) {
 306                         err = -EOPNOTSUPP;
 307                         break;
 308                 }
 309                 err = nfs4_handle_exception(server, err, &exception);
 310         } while (exception.retry);
 311
 312         nfs_put_lock_context(lock);
 313         return err;
 314 }
 315
 316
 317 static void
 318 nfs42_layoutstat_prepare(struct rpc_task *task, void *calldata)
 319 {
 320         struct nfs42_layoutstat_data *data = calldata;
 321         struct inode *inode = data->inode;
 322         struct nfs_server *server = NFS_SERVER(inode);
 323         struct pnfs_layout_hdr *lo;
 324
 325         spin_lock(&inode->i_lock);
 326         lo = NFS_I(inode)->layout;
 327         if (!pnfs_layout_is_valid(lo)) {
 328                 spin_unlock(&inode->i_lock);
 329                 rpc_exit(task, 0);
 330                 return;
 331         }
 332         nfs4_stateid_copy(&data->args.stateid, &lo->plh_stateid);
 333         spin_unlock(&inode->i_lock);
 334         nfs41_setup_sequence(nfs4_get_session(server), &data->args.seq_args,
 335                              &data->res.seq_res, task);
 336
 337 }
 338
 339 static void
 340 nfs42_layoutstat_done(struct rpc_task *task, void *calldata)
 341 {
 342         struct nfs42_layoutstat_data *data = calldata;
 343         struct inode *inode = data->inode;
 344         struct pnfs_layout_hdr *lo;
 345
 346         if (!nfs4_sequence_done(task, &data->res.seq_res))
 347                 return;
 348
 349         switch (task->tk_status) {
 350         case 0:
 351                 break;
 352         case -NFS4ERR_EXPIRED:
 353         case -NFS4ERR_ADMIN_REVOKED:
 354         case -NFS4ERR_DELEG_REVOKED:
 355         case -NFS4ERR_STALE_STATEID:
 356         case -NFS4ERR_BAD_STATEID:
 357                 spin_lock(&inode->i_lock);
 358                 lo = NFS_I(inode)->layout;
 359                 if (pnfs_layout_is_valid(lo) &&
 360                     nfs4_stateid_match(&data->args.stateid,
 361                                              &lo->plh_stateid)) {
 362                         LIST_HEAD(head);
 363
 364                         /*
 365                          * Mark the bad layout state as invalid, then retry
 366                          * with the current stateid.
 367                          */
 368                         pnfs_mark_layout_stateid_invalid(lo, &head);
 369                         spin_unlock(&inode->i_lock);
 370                         pnfs_free_lseg_list(&head);
 371                 } else
 372                         spin_unlock(&inode->i_lock);
 373                 break;
 374         case -NFS4ERR_OLD_STATEID:
 375                 spin_lock(&inode->i_lock);
 376                 lo = NFS_I(inode)->layout;
 377                 if (pnfs_layout_is_valid(lo) &&
 378                     nfs4_stateid_match_other(&data->args.stateid,
 379                                         &lo->plh_stateid)) {
 380                         /* Do we need to delay before resending? */
 381                         if (!nfs4_stateid_is_newer(&lo->plh_stateid,
 382                                                 &data->args.stateid))
 383                                 rpc_delay(task, HZ);
 384                         rpc_restart_call_prepare(task);
 385                 }
 386                 spin_unlock(&inode->i_lock);
 387                 break;
 388         case -ENOTSUPP:
 389         case -EOPNOTSUPP:
 390                 NFS_SERVER(inode)->caps &= ~NFS_CAP_LAYOUTSTATS;
 391         }
 392
 393         dprintk("%s server returns %d\n", __func__, task->tk_status);
 394 }
 395
 396 static void
 397 nfs42_layoutstat_release(void *calldata)
 398 {
 399         struct nfs42_layoutstat_data *data = calldata;
 400         struct nfs_server *nfss = NFS_SERVER(data->args.inode);
 401
 402         if (nfss->pnfs_curr_ld->cleanup_layoutstats)
 403                 nfss->pnfs_curr_ld->cleanup_layoutstats(data);
 404
 405         pnfs_put_layout_hdr(NFS_I(data->args.inode)->layout);
 406         smp_mb__before_atomic();
 407         clear_bit(NFS_INO_LAYOUTSTATS, &NFS_I(data->args.inode)->flags);
 408         smp_mb__after_atomic();
 409         nfs_iput_and_deactive(data->inode);
 410         kfree(data->args.devinfo);
 411         kfree(data);
 412 }
 413
 414 static const struct rpc_call_ops nfs42_layoutstat_ops = {
 415         .rpc_call_prepare = nfs42_layoutstat_prepare,
 416         .rpc_call_done = nfs42_layoutstat_done,
 417         .rpc_release = nfs42_layoutstat_release,
 418 };
 419
 420 int nfs42_proc_layoutstats_generic(struct nfs_server *server,
 421                                    struct nfs42_layoutstat_data *data)
 422 {
 423         struct rpc_message msg = {
 424                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTSTATS],
 425                 .rpc_argp = &data->args,
 426                 .rpc_resp = &data->res,
 427         };
 428         struct rpc_task_setup task_setup = {
 429                 .rpc_client = server->client,
 430                 .rpc_message = &msg,
 431                 .callback_ops = &nfs42_layoutstat_ops,
 432                 .callback_data = data,
 433                 .flags = RPC_TASK_ASYNC,
 434         };
 435         struct rpc_task *task;
 436
 437         data->inode = nfs_igrab_and_active(data->args.inode);
 438         if (!data->inode) {
 439                 nfs42_layoutstat_release(data);
 440                 return -EAGAIN;
 441         }
 442         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
 443         task = rpc_run_task(&task_setup);
 444         if (IS_ERR(task))
 445                 return PTR_ERR(task);
 446         return 0;
 447 }
 448
 449 static int _nfs42_proc_clone(struct rpc_message *msg, struct file *src_f,
 450                 struct file *dst_f, struct nfs_lock_context *src_lock,
 451                 struct nfs_lock_context *dst_lock, loff_t src_offset,
 452                 loff_t dst_offset, loff_t count)
 453 {
 454         struct inode *src_inode = file_inode(src_f);
 455         struct inode *dst_inode = file_inode(dst_f);
 456         struct nfs_server *server = NFS_SERVER(dst_inode);
 457         struct nfs42_clone_args args = {
 458                 .src_fh = NFS_FH(src_inode),
 459                 .dst_fh = NFS_FH(dst_inode),
 460                 .src_offset = src_offset,
 461                 .dst_offset = dst_offset,
 462                 .count = count,
 463                 .dst_bitmask = server->cache_consistency_bitmask,
 464         };
 465         struct nfs42_clone_res res = {
 466                 .server = server,
 467         };
 468         int status;
 469
 470         msg->rpc_argp = &args;
 471         msg->rpc_resp = &res;
 472
 473         status = nfs4_set_rw_stateid(&args.src_stateid, src_lock->open_context,
 474                         src_lock, FMODE_READ);
 475         if (status)
 476                 return status;
 477
 478         status = nfs4_set_rw_stateid(&args.dst_stateid, dst_lock->open_context,
 479                         dst_lock, FMODE_WRITE);
 480         if (status)
 481                 return status;
 482
 483         res.dst_fattr = nfs_alloc_fattr();
 484         if (!res.dst_fattr)
 485                 return -ENOMEM;
 486
 487         status = nfs4_call_sync(server->client, server, msg,
 488                                 &args.seq_args, &res.seq_res, 0);
 489         if (status == 0)
 490                 status = nfs_post_op_update_inode(dst_inode, res.dst_fattr);
 491
 492         kfree(res.dst_fattr);
 493         return status;
 494 }
 495
 496 int nfs42_proc_clone(struct file *src_f, struct file *dst_f,
 497                      loff_t src_offset, loff_t dst_offset, loff_t count)
 498 {
 499         struct rpc_message msg = {
 500                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLONE],
 501         };
 502         struct inode *inode = file_inode(src_f);
 503         struct nfs_server *server = NFS_SERVER(file_inode(src_f));
 504         struct nfs_lock_context *src_lock;
 505         struct nfs_lock_context *dst_lock;
 506         struct nfs4_exception src_exception = { };
 507         struct nfs4_exception dst_exception = { };
 508         int err, err2;
 509
 510         if (!nfs_server_capable(inode, NFS_CAP_CLONE))
 511                 return -EOPNOTSUPP;
 512
 513         src_lock = nfs_get_lock_context(nfs_file_open_context(src_f));
 514         if (IS_ERR(src_lock))
 515                 return PTR_ERR(src_lock);
 516
 517         src_exception.inode = file_inode(src_f);
 518         src_exception.state = src_lock->open_context->state;
 519
 520         dst_lock = nfs_get_lock_context(nfs_file_open_context(dst_f));
 521         if (IS_ERR(dst_lock)) {
 522                 err = PTR_ERR(dst_lock);
 523                 goto out_put_src_lock;
 524         }
 525
 526         dst_exception.inode = file_inode(dst_f);
 527         dst_exception.state = dst_lock->open_context->state;
 528
 529         do {
 530                 err = _nfs42_proc_clone(&msg, src_f, dst_f, src_lock, dst_lock,
 531                                         src_offset, dst_offset, count);
 532                 if (err == -ENOTSUPP || err == -EOPNOTSUPP) {
 533                         NFS_SERVER(inode)->caps &= ~NFS_CAP_CLONE;
 534                         err = -EOPNOTSUPP;
 535                         break;
 536                 }
 537
 538                 err2 = nfs4_handle_exception(server, err, &src_exception);
 539                 err = nfs4_handle_exception(server, err, &dst_exception);
 540                 if (!err)
 541                         err = err2;
 542         } while (src_exception.retry || dst_exception.retry);
 543
 544         nfs_put_lock_context(dst_lock);
 545 out_put_src_lock:
 546         nfs_put_lock_context(src_lock);
 547         return err;
 548 }