fs/orangefs/file.c

   1 /*
   2  * (C) 2001 Clemson University and The University of Chicago
   3  *
   4  * See COPYING in top-level directory.
   5  */
   6
   7 /*
   8  *  Linux VFS file operations.
   9  */
  10
  11 #include "protocol.h"
  12 #include "orangefs-kernel.h"
  13 #include "orangefs-bufmap.h"
  14 #include <linux/fs.h>
  15 #include <linux/pagemap.h>
  16
  17 static int flush_racache(struct inode *inode)
  18 {
  19         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
  20         struct orangefs_kernel_op_s *new_op;
  21         int ret;
  22
  23         gossip_debug(GOSSIP_UTILS_DEBUG,
  24             "%s: %pU: Handle is %pU | fs_id %d\n", __func__,
  25             get_khandle_from_ino(inode), &orangefs_inode->refn.khandle,
  26             orangefs_inode->refn.fs_id);
  27
  28         new_op = op_alloc(ORANGEFS_VFS_OP_RA_FLUSH);
  29         if (!new_op)
  30                 return -ENOMEM;
  31         new_op->upcall.req.ra_cache_flush.refn = orangefs_inode->refn;
  32
  33         ret = service_operation(new_op, "orangefs_flush_racache",
  34             get_interruptible_flag(inode));
  35
  36         gossip_debug(GOSSIP_UTILS_DEBUG, "%s: got return value of %d\n",
  37             __func__, ret);
  38
  39         op_release(new_op);
  40         return ret;
  41 }
  42
  43 /*
  44  * Copy to client-core's address space from the buffers specified
  45  * by the iovec upto total_size bytes.
  46  * NOTE: the iovector can either contain addresses which
  47  *       can futher be kernel-space or user-space addresses.
  48  *       or it can pointers to struct page's
  49  */
  50 static int precopy_buffers(int buffer_index,
  51                            struct iov_iter *iter,
  52                            size_t total_size)
  53 {
  54         int ret = 0;
  55         /*
  56          * copy data from application/kernel by pulling it out
  57          * of the iovec.
  58          */
  59
  60
  61         if (total_size) {
  62                 ret = orangefs_bufmap_copy_from_iovec(iter,
  63                                                       buffer_index,
  64                                                       total_size);
  65                 if (ret < 0)
  66                 gossip_err("%s: Failed to copy-in buffers. Please make sure that the pvfs2-client is running. %ld\n",
  67                            __func__,
  68                            (long)ret);
  69         }
  70
  71         if (ret < 0)
  72                 gossip_err("%s: Failed to copy-in buffers. Please make sure that the pvfs2-client is running. %ld\n",
  73                         __func__,
  74                         (long)ret);
  75         return ret;
  76 }
  77
  78 /*
  79  * Copy from client-core's address space to the buffers specified
  80  * by the iovec upto total_size bytes.
  81  * NOTE: the iovector can either contain addresses which
  82  *       can futher be kernel-space or user-space addresses.
  83  *       or it can pointers to struct page's
  84  */
  85 static int postcopy_buffers(int buffer_index,
  86                             struct iov_iter *iter,
  87                             size_t total_size)
  88 {
  89         int ret = 0;
  90         /*
  91          * copy data to application/kernel by pushing it out to
  92          * the iovec. NOTE; target buffers can be addresses or
  93          * struct page pointers.
  94          */
  95         if (total_size) {
  96                 ret = orangefs_bufmap_copy_to_iovec(iter,
  97                                                     buffer_index,
  98                                                     total_size);
  99                 if (ret < 0)
 100                         gossip_err("%s: Failed to copy-out buffers. Please make sure that the pvfs2-client is running (%ld)\n",
 101                                 __func__,
 102                                 (long)ret);
 103         }
 104         return ret;
 105 }
 106
 107 /*
 108  * Post and wait for the I/O upcall to finish
 109  */
 110 static ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inode,
 111                 loff_t *offset, struct iov_iter *iter,
 112                 size_t total_size, loff_t readahead_size)
 113 {
 114         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 115         struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
 116         struct orangefs_kernel_op_s *new_op = NULL;
 117         int buffer_index = -1;
 118         ssize_t ret;
 119
 120         new_op = op_alloc(ORANGEFS_VFS_OP_FILE_IO);
 121         if (!new_op)
 122                 return -ENOMEM;
 123
 124         /* synchronous I/O */
 125         new_op->upcall.req.io.readahead_size = readahead_size;
 126         new_op->upcall.req.io.io_type = type;
 127         new_op->upcall.req.io.refn = orangefs_inode->refn;
 128
 129 populate_shared_memory:
 130         /* get a shared buffer index */
 131         buffer_index = orangefs_bufmap_get();
 132         if (buffer_index < 0) {
 133                 ret = buffer_index;
 134                 gossip_debug(GOSSIP_FILE_DEBUG,
 135                              "%s: orangefs_bufmap_get failure (%zd)\n",
 136                              __func__, ret);
 137                 goto out;
 138         }
 139         gossip_debug(GOSSIP_FILE_DEBUG,
 140                      "%s(%pU): GET op %p -> buffer_index %d\n",
 141                      __func__,
 142                      handle,
 143                      new_op,
 144                      buffer_index);
 145
 146         new_op->uses_shared_memory = 1;
 147         new_op->upcall.req.io.buf_index = buffer_index;
 148         new_op->upcall.req.io.count = total_size;
 149         new_op->upcall.req.io.offset = *offset;
 150
 151         gossip_debug(GOSSIP_FILE_DEBUG,
 152                      "%s(%pU): offset: %llu total_size: %zd\n",
 153                      __func__,
 154                      handle,
 155                      llu(*offset),
 156                      total_size);
 157         /*
 158          * Stage 1: copy the buffers into client-core's address space
 159          * precopy_buffers only pertains to writes.
 160          */
 161         if (type == ORANGEFS_IO_WRITE) {
 162                 ret = precopy_buffers(buffer_index,
 163                                       iter,
 164                                       total_size);
 165                 if (ret < 0)
 166                         goto out;
 167         }
 168
 169         gossip_debug(GOSSIP_FILE_DEBUG,
 170                      "%s(%pU): Calling post_io_request with tag (%llu)\n",
 171                      __func__,
 172                      handle,
 173                      llu(new_op->tag));
 174
 175         /* Stage 2: Service the I/O operation */
 176         ret = service_operation(new_op,
 177                                 type == ORANGEFS_IO_WRITE ?
 178                                         "file_write" :
 179                                         "file_read",
 180                                 get_interruptible_flag(inode));
 181
 182         /*
 183          * If service_operation() returns -EAGAIN #and# the operation was
 184          * purged from orangefs_request_list or htable_ops_in_progress, then
 185          * we know that the client was restarted, causing the shared memory
 186          * area to be wiped clean.  To restart a  write operation in this
 187          * case, we must re-copy the data from the user's iovec to a NEW
 188          * shared memory location. To restart a read operation, we must get
 189          * a new shared memory location.
 190          */
 191         if (ret == -EAGAIN && op_state_purged(new_op)) {
 192                 orangefs_bufmap_put(buffer_index);
 193                 buffer_index = -1;
 194                 if (type == ORANGEFS_IO_WRITE)
 195                         iov_iter_revert(iter, total_size);
 196                 gossip_debug(GOSSIP_FILE_DEBUG,
 197                              "%s:going to repopulate_shared_memory.\n",
 198                              __func__);
 199                 goto populate_shared_memory;
 200         }
 201
 202         if (ret < 0) {
 203                 if (ret == -EINTR) {
 204                         /*
 205                          * We can't return EINTR if any data was written,
 206                          * it's not POSIX. It is minimally acceptable
 207                          * to give a partial write, the way NFS does.
 208                          *
 209                          * It would be optimal to return all or nothing,
 210                          * but if a userspace write is bigger than
 211                          * an IO buffer, and the interrupt occurs
 212                          * between buffer writes, that would not be
 213                          * possible.
 214                          */
 215                         switch (new_op->op_state - OP_VFS_STATE_GIVEN_UP) {
 216                         /*
 217                          * If the op was waiting when the interrupt
 218                          * occurred, then the client-core did not
 219                          * trigger the write.
 220                          */
 221                         case OP_VFS_STATE_WAITING:
 222                                 if (*offset == 0)
 223                                         ret = -EINTR;
 224                                 else
 225                                         ret = 0;
 226                                 break;
 227                         /*
 228                          * If the op was in progress when the interrupt
 229                          * occurred, then the client-core was able to
 230                          * trigger the write.
 231                          */
 232                         case OP_VFS_STATE_INPROGR:
 233                                 ret = total_size;
 234                                 break;
 235                         default:
 236                                 gossip_err("%s: unexpected op state :%d:.\n",
 237                                            __func__,
 238                                            new_op->op_state);
 239                                 ret = 0;
 240                                 break;
 241                         }
 242                         gossip_debug(GOSSIP_FILE_DEBUG,
 243                                      "%s: got EINTR, state:%d: %p\n",
 244                                      __func__,
 245                                      new_op->op_state,
 246                                      new_op);
 247                 } else {
 248                         gossip_err("%s: error in %s handle %pU, returning %zd\n",
 249                                 __func__,
 250                                 type == ORANGEFS_IO_READ ?
 251                                         "read from" : "write to",
 252                                 handle, ret);
 253                 }
 254                 if (orangefs_cancel_op_in_progress(new_op))
 255                         return ret;
 256
 257                 goto out;
 258         }
 259
 260         /*
 261          * Stage 3: Post copy buffers from client-core's address space
 262          * postcopy_buffers only pertains to reads.
 263          */
 264         if (type == ORANGEFS_IO_READ) {
 265                 ret = postcopy_buffers(buffer_index,
 266                                        iter,
 267                                        new_op->downcall.resp.io.amt_complete);
 268                 if (ret < 0)
 269                         goto out;
 270         }
 271         gossip_debug(GOSSIP_FILE_DEBUG,
 272             "%s(%pU): Amount %s, returned by the sys-io call:%d\n",
 273             __func__,
 274             handle,
 275             type == ORANGEFS_IO_READ ?  "read" : "written",
 276             (int)new_op->downcall.resp.io.amt_complete);
 277
 278         ret = new_op->downcall.resp.io.amt_complete;
 279
 280 out:
 281         if (buffer_index >= 0) {
 282                 orangefs_bufmap_put(buffer_index);
 283                 gossip_debug(GOSSIP_FILE_DEBUG,
 284                              "%s(%pU): PUT buffer_index %d\n",
 285                              __func__, handle, buffer_index);
 286                 buffer_index = -1;
 287         }
 288         op_release(new_op);
 289         return ret;
 290 }
 291
 292 /*
 293  * Common entry point for read/write/readv/writev
 294  * This function will dispatch it to either the direct I/O
 295  * or buffered I/O path depending on the mount options and/or
 296  * augmented/extended metadata attached to the file.
 297  * Note: File extended attributes override any mount options.
 298  */
 299 static ssize_t do_readv_writev(enum ORANGEFS_io_type type, struct file *file,
 300                 loff_t *offset, struct iov_iter *iter)
 301 {
 302         struct inode *inode = file->f_mapping->host;
 303         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 304         struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
 305         size_t count = iov_iter_count(iter);
 306         ssize_t total_count = 0;
 307         ssize_t ret = -EINVAL;
 308
 309         gossip_debug(GOSSIP_FILE_DEBUG,
 310                 "%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
 311                 __func__,
 312                 handle,
 313                 (int)count);
 314
 315         if (type == ORANGEFS_IO_WRITE) {
 316                 gossip_debug(GOSSIP_FILE_DEBUG,
 317                              "%s(%pU): proceeding with offset : %llu, "
 318                              "size %d\n",
 319                              __func__,
 320                              handle,
 321                              llu(*offset),
 322                              (int)count);
 323         }
 324
 325         if (count == 0) {
 326                 ret = 0;
 327                 goto out;
 328         }
 329
 330         while (iov_iter_count(iter)) {
 331                 size_t each_count = iov_iter_count(iter);
 332                 size_t amt_complete;
 333
 334                 /* how much to transfer in this loop iteration */
 335                 if (each_count > orangefs_bufmap_size_query())
 336                         each_count = orangefs_bufmap_size_query();
 337
 338                 gossip_debug(GOSSIP_FILE_DEBUG,
 339                              "%s(%pU): size of each_count(%d)\n",
 340                              __func__,
 341                              handle,
 342                              (int)each_count);
 343                 gossip_debug(GOSSIP_FILE_DEBUG,
 344                              "%s(%pU): BEFORE wait_for_io: offset is %d\n",
 345                              __func__,
 346                              handle,
 347                              (int)*offset);
 348
 349                 ret = wait_for_direct_io(type, inode, offset, iter,
 350                                 each_count, 0);
 351                 gossip_debug(GOSSIP_FILE_DEBUG,
 352                              "%s(%pU): return from wait_for_io:%d\n",
 353                              __func__,
 354                              handle,
 355                              (int)ret);
 356
 357                 if (ret < 0)
 358                         goto out;
 359
 360                 *offset += ret;
 361                 total_count += ret;
 362                 amt_complete = ret;
 363
 364                 gossip_debug(GOSSIP_FILE_DEBUG,
 365                              "%s(%pU): AFTER wait_for_io: offset is %d\n",
 366                              __func__,
 367                              handle,
 368                              (int)*offset);
 369
 370                 /*
 371                  * if we got a short I/O operations,
 372                  * fall out and return what we got so far
 373                  */
 374                 if (amt_complete < each_count)
 375                         break;
 376         } /*end while */
 377
 378 out:
 379         if (total_count > 0)
 380                 ret = total_count;
 381         if (ret > 0) {
 382                 if (type == ORANGEFS_IO_READ) {
 383                         file_accessed(file);
 384                 } else {
 385                         SetMtimeFlag(orangefs_inode);
 386                         inode->i_mtime = current_time(inode);
 387                         mark_inode_dirty_sync(inode);
 388                 }
 389         }
 390
 391         gossip_debug(GOSSIP_FILE_DEBUG,
 392                      "%s(%pU): Value(%d) returned.\n",
 393                      __func__,
 394                      handle,
 395                      (int)ret);
 396
 397         return ret;
 398 }
 399
 400 /*
 401  * Read data from a specified offset in a file (referenced by inode).
 402  * Data may be placed either in a user or kernel buffer.
 403  */
 404 ssize_t orangefs_inode_read(struct inode *inode,
 405                             struct iov_iter *iter,
 406                             loff_t *offset,
 407                             loff_t readahead_size)
 408 {
 409         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 410         size_t count = iov_iter_count(iter);
 411         size_t bufmap_size;
 412         ssize_t ret = -EINVAL;
 413
 414         orangefs_stats.reads++;
 415
 416         bufmap_size = orangefs_bufmap_size_query();
 417         if (count > bufmap_size) {
 418                 gossip_debug(GOSSIP_FILE_DEBUG,
 419                              "%s: count is too large (%zd/%zd)!\n",
 420                              __func__, count, bufmap_size);
 421                 return -EINVAL;
 422         }
 423
 424         gossip_debug(GOSSIP_FILE_DEBUG,
 425                      "%s(%pU) %zd@%llu\n",
 426                      __func__,
 427                      &orangefs_inode->refn.khandle,
 428                      count,
 429                      llu(*offset));
 430
 431         ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, offset, iter,
 432                         count, readahead_size);
 433         if (ret > 0)
 434                 *offset += ret;
 435
 436         gossip_debug(GOSSIP_FILE_DEBUG,
 437                      "%s(%pU): Value(%zd) returned.\n",
 438                      __func__,
 439                      &orangefs_inode->refn.khandle,
 440                      ret);
 441
 442         return ret;
 443 }
 444
 445 static ssize_t orangefs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 446 {
 447         struct file *file = iocb->ki_filp;
 448         loff_t pos = *(&iocb->ki_pos);
 449         ssize_t rc = 0;
 450
 451         BUG_ON(iocb->private);
 452
 453         gossip_debug(GOSSIP_FILE_DEBUG, "orangefs_file_read_iter\n");
 454
 455         orangefs_stats.reads++;
 456
 457         rc = do_readv_writev(ORANGEFS_IO_READ, file, &pos, iter);
 458         iocb->ki_pos = pos;
 459
 460         return rc;
 461 }
 462
 463 static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
 464 {
 465         struct file *file = iocb->ki_filp;
 466         loff_t pos;
 467         ssize_t rc;
 468
 469         BUG_ON(iocb->private);
 470
 471         gossip_debug(GOSSIP_FILE_DEBUG, "orangefs_file_write_iter\n");
 472
 473         inode_lock(file->f_mapping->host);
 474
 475         /* Make sure generic_write_checks sees an up to date inode size. */
 476         if (file->f_flags & O_APPEND) {
 477                 rc = orangefs_inode_getattr(file->f_mapping->host, 0, 1,
 478                     STATX_SIZE);
 479                 if (rc == -ESTALE)
 480                         rc = -EIO;
 481                 if (rc) {
 482                         gossip_err("%s: orangefs_inode_getattr failed, "
 483                             "rc:%zd:.\n", __func__, rc);
 484                         goto out;
 485                 }
 486         }
 487
 488         if (file->f_pos > i_size_read(file->f_mapping->host))
 489                 orangefs_i_size_write(file->f_mapping->host, file->f_pos);
 490
 491         rc = generic_write_checks(iocb, iter);
 492
 493         if (rc <= 0) {
 494                 gossip_err("%s: generic_write_checks failed, rc:%zd:.\n",
 495                            __func__, rc);
 496                 goto out;
 497         }
 498
 499         /*
 500          * if we are appending, generic_write_checks would have updated
 501          * pos to the end of the file, so we will wait till now to set
 502          * pos...
 503          */
 504         pos = *(&iocb->ki_pos);
 505
 506         rc = do_readv_writev(ORANGEFS_IO_WRITE,
 507                              file,
 508                              &pos,
 509                              iter);
 510         if (rc < 0) {
 511                 gossip_err("%s: do_readv_writev failed, rc:%zd:.\n",
 512                            __func__, rc);
 513                 goto out;
 514         }
 515
 516         iocb->ki_pos = pos;
 517         orangefs_stats.writes++;
 518
 519 out:
 520
 521         inode_unlock(file->f_mapping->host);
 522         return rc;
 523 }
 524
 525 /*
 526  * Perform a miscellaneous operation on a file.
 527  */
 528 static long orangefs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 529 {
 530         int ret = -ENOTTY;
 531         __u64 val = 0;
 532         unsigned long uval;
 533
 534         gossip_debug(GOSSIP_FILE_DEBUG,
 535                      "orangefs_ioctl: called with cmd %d\n",
 536                      cmd);
 537
 538         /*
 539          * we understand some general ioctls on files, such as the immutable
 540          * and append flags
 541          */
 542         if (cmd == FS_IOC_GETFLAGS) {
 543                 val = 0;
 544                 ret = orangefs_inode_getxattr(file_inode(file),
 545                                               "user.pvfs2.meta_hint",
 546                                               &val, sizeof(val));
 547                 if (ret < 0 && ret != -ENODATA)
 548                         return ret;
 549                 else if (ret == -ENODATA)
 550                         val = 0;
 551                 uval = val;
 552                 gossip_debug(GOSSIP_FILE_DEBUG,
 553                              "orangefs_ioctl: FS_IOC_GETFLAGS: %llu\n",
 554                              (unsigned long long)uval);
 555                 return put_user(uval, (int __user *)arg);
 556         } else if (cmd == FS_IOC_SETFLAGS) {
 557                 ret = 0;
 558                 if (get_user(uval, (int __user *)arg))
 559                         return -EFAULT;
 560                 /*
 561                  * ORANGEFS_MIRROR_FL is set internally when the mirroring mode
 562                  * is turned on for a file. The user is not allowed to turn
 563                  * on this bit, but the bit is present if the user first gets
 564                  * the flags and then updates the flags with some new
 565                  * settings. So, we ignore it in the following edit. bligon.
 566                  */
 567                 if ((uval & ~ORANGEFS_MIRROR_FL) &
 568                     (~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NOATIME_FL))) {
 569                         gossip_err("orangefs_ioctl: the FS_IOC_SETFLAGS only supports setting one of FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NOATIME_FL\n");
 570                         return -EINVAL;
 571                 }
 572                 val = uval;
 573                 gossip_debug(GOSSIP_FILE_DEBUG,
 574                              "orangefs_ioctl: FS_IOC_SETFLAGS: %llu\n",
 575                              (unsigned long long)val);
 576                 ret = orangefs_inode_setxattr(file_inode(file),
 577                                               "user.pvfs2.meta_hint",
 578                                               &val, sizeof(val), 0);
 579         }
 580
 581         return ret;
 582 }
 583
 584 /*
 585  * Memory map a region of a file.
 586  */
 587 static int orangefs_file_mmap(struct file *file, struct vm_area_struct *vma)
 588 {
 589         gossip_debug(GOSSIP_FILE_DEBUG,
 590                      "orangefs_file_mmap: called on %s\n",
 591                      (file ?
 592                         (char *)file->f_path.dentry->d_name.name :
 593                         (char *)"Unknown"));
 594
 595         /* set the sequential readahead hint */
 596         vma->vm_flags |= VM_SEQ_READ;
 597         vma->vm_flags &= ~VM_RAND_READ;
 598
 599         /* Use readonly mmap since we cannot support writable maps. */
 600         return generic_file_readonly_mmap(file, vma);
 601 }
 602
 603 #define mapping_nrpages(idata) ((idata)->nrpages)
 604
 605 /*
 606  * Called to notify the module that there are no more references to
 607  * this file (i.e. no processes have it open).
 608  *
 609  * \note Not called when each file is closed.
 610  */
 611 static int orangefs_file_release(struct inode *inode, struct file *file)
 612 {
 613         gossip_debug(GOSSIP_FILE_DEBUG,
 614                      "orangefs_file_release: called on %pD\n",
 615                      file);
 616
 617         orangefs_flush_inode(inode);
 618
 619         /*
 620          * remove all associated inode pages from the page cache and
 621          * readahead cache (if any); this forces an expensive refresh of
 622          * data for the next caller of mmap (or 'get_block' accesses)
 623          */
 624         if (file_inode(file) &&
 625             file_inode(file)->i_mapping &&
 626             mapping_nrpages(&file_inode(file)->i_data)) {
 627                 if (orangefs_features & ORANGEFS_FEATURE_READAHEAD) {
 628                         gossip_debug(GOSSIP_INODE_DEBUG,
 629                             "calling flush_racache on %pU\n",
 630                             get_khandle_from_ino(inode));
 631                         flush_racache(inode);
 632                         gossip_debug(GOSSIP_INODE_DEBUG,
 633                             "flush_racache finished\n");
 634                 }
 635                 truncate_inode_pages(file_inode(file)->i_mapping,
 636                                      0);
 637         }
 638         return 0;
 639 }
 640
 641 /*
 642  * Push all data for a specific file onto permanent storage.
 643  */
 644 static int orangefs_fsync(struct file *file,
 645                        loff_t start,
 646                        loff_t end,
 647                        int datasync)
 648 {
 649         int ret;
 650         struct orangefs_inode_s *orangefs_inode =
 651                 ORANGEFS_I(file_inode(file));
 652         struct orangefs_kernel_op_s *new_op = NULL;
 653
 654         new_op = op_alloc(ORANGEFS_VFS_OP_FSYNC);
 655         if (!new_op)
 656                 return -ENOMEM;
 657         new_op->upcall.req.fsync.refn = orangefs_inode->refn;
 658
 659         ret = service_operation(new_op,
 660                         "orangefs_fsync",
 661                         get_interruptible_flag(file_inode(file)));
 662
 663         gossip_debug(GOSSIP_FILE_DEBUG,
 664                      "orangefs_fsync got return value of %d\n",
 665                      ret);
 666
 667         op_release(new_op);
 668
 669         orangefs_flush_inode(file_inode(file));
 670         return ret;
 671 }
 672
 673 /*
 674  * Change the file pointer position for an instance of an open file.
 675  *
 676  * \note If .llseek is overriden, we must acquire lock as described in
 677  *       Documentation/filesystems/Locking.
 678  *
 679  * Future upgrade could support SEEK_DATA and SEEK_HOLE but would
 680  * require much changes to the FS
 681  */
 682 static loff_t orangefs_file_llseek(struct file *file, loff_t offset, int origin)
 683 {
 684         int ret = -EINVAL;
 685         struct inode *inode = file_inode(file);
 686
 687         if (origin == SEEK_END) {
 688                 /*
 689                  * revalidate the inode's file size.
 690                  * NOTE: We are only interested in file size here,
 691                  * so we set mask accordingly.
 692                  */
 693                 ret = orangefs_inode_getattr(file->f_mapping->host, 0, 1,
 694                     STATX_SIZE);
 695                 if (ret == -ESTALE)
 696                         ret = -EIO;
 697                 if (ret) {
 698                         gossip_debug(GOSSIP_FILE_DEBUG,
 699                                      "%s:%s:%d calling make bad inode\n",
 700                                      __FILE__,
 701                                      __func__,
 702                                      __LINE__);
 703                         return ret;
 704                 }
 705         }
 706
 707         gossip_debug(GOSSIP_FILE_DEBUG,
 708                      "orangefs_file_llseek: offset is %ld | origin is %d"
 709                      " | inode size is %lu\n",
 710                      (long)offset,
 711                      origin,
 712                      (unsigned long)i_size_read(inode));
 713
 714         return generic_file_llseek(file, offset, origin);
 715 }
 716
 717 /*
 718  * Support local locks (locks that only this kernel knows about)
 719  * if Orangefs was mounted -o local_lock.
 720  */
 721 static int orangefs_lock(struct file *filp, int cmd, struct file_lock *fl)
 722 {
 723         int rc = -EINVAL;
 724
 725         if (ORANGEFS_SB(file_inode(filp)->i_sb)->flags & ORANGEFS_OPT_LOCAL_LOCK) {
 726                 if (cmd == F_GETLK) {
 727                         rc = 0;
 728                         posix_test_lock(filp, fl);
 729                 } else {
 730                         rc = posix_lock_file(filp, fl, NULL);
 731                 }
 732         }
 733
 734         return rc;
 735 }
 736
 737 /** ORANGEFS implementation of VFS file operations */
 738 const struct file_operations orangefs_file_operations = {
 739         .llseek         = orangefs_file_llseek,
 740         .read_iter      = orangefs_file_read_iter,
 741         .write_iter     = orangefs_file_write_iter,
 742         .lock           = orangefs_lock,
 743         .unlocked_ioctl = orangefs_ioctl,
 744         .mmap           = orangefs_file_mmap,
 745         .open           = generic_file_open,
 746         .release        = orangefs_file_release,
 747         .fsync          = orangefs_fsync,
 748 };