fs/orangefs/inode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) 2001 Clemson University and The University of Chicago
   4  * Copyright 2018 Omnibond Systems, L.L.C.
   5  *
   6  * See COPYING in top-level directory.
   7  */
   8
   9 /*
  10  *  Linux VFS inode operations.
  11  */
  12
  13 #include <linux/bvec.h>
  14 #include "protocol.h"
  15 #include "orangefs-kernel.h"
  16 #include "orangefs-bufmap.h"
  17
  18 static int orangefs_writepage_locked(struct page *page,
  19     struct writeback_control *wbc)
  20 {
  21         struct inode *inode = page->mapping->host;
  22         struct orangefs_write_range *wr = NULL;
  23         struct iov_iter iter;
  24         struct bio_vec bv;
  25         size_t len, wlen;
  26         ssize_t ret;
  27         loff_t off;
  28
  29         set_page_writeback(page);
  30
  31         len = i_size_read(inode);
  32         if (PagePrivate(page)) {
  33                 wr = (struct orangefs_write_range *)page_private(page);
  34                 WARN_ON(wr->pos >= len);
  35                 off = wr->pos;
  36                 if (off + wr->len > len)
  37                         wlen = len - off;
  38                 else
  39                         wlen = wr->len;
  40         } else {
  41                 WARN_ON(1);
  42                 off = page_offset(page);
  43                 if (off + PAGE_SIZE > len)
  44                         wlen = len - off;
  45                 else
  46                         wlen = PAGE_SIZE;
  47         }
  48         /* Should've been handled in orangefs_invalidatepage. */
  49         WARN_ON(off == len || off + wlen > len);
  50
  51         bv.bv_page = page;
  52         bv.bv_len = wlen;
  53         bv.bv_offset = off % PAGE_SIZE;
  54         WARN_ON(wlen == 0);
  55         iov_iter_bvec(&iter, WRITE, &bv, 1, wlen);
  56
  57         ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, wlen,
  58             len, wr, NULL);
  59         if (ret < 0) {
  60                 SetPageError(page);
  61                 mapping_set_error(page->mapping, ret);
  62         } else {
  63                 ret = 0;
  64         }
  65         if (wr) {
  66                 kfree(wr);
  67                 set_page_private(page, 0);
  68                 ClearPagePrivate(page);
  69                 put_page(page);
  70         }
  71         return ret;
  72 }
  73
  74 static int orangefs_writepage(struct page *page, struct writeback_control *wbc)
  75 {
  76         int ret;
  77         ret = orangefs_writepage_locked(page, wbc);
  78         unlock_page(page);
  79         end_page_writeback(page);
  80         return ret;
  81 }
  82
  83 struct orangefs_writepages {
  84         loff_t off;
  85         size_t len;
  86         kuid_t uid;
  87         kgid_t gid;
  88         int maxpages;
  89         int npages;
  90         struct page **pages;
  91         struct bio_vec *bv;
  92 };
  93
  94 static int orangefs_writepages_work(struct orangefs_writepages *ow,
  95     struct writeback_control *wbc)
  96 {
  97         struct inode *inode = ow->pages[0]->mapping->host;
  98         struct orangefs_write_range *wrp, wr;
  99         struct iov_iter iter;
 100         ssize_t ret;
 101         size_t len;
 102         loff_t off;
 103         int i;
 104
 105         len = i_size_read(inode);
 106
 107         for (i = 0; i < ow->npages; i++) {
 108                 set_page_writeback(ow->pages[i]);
 109                 ow->bv[i].bv_page = ow->pages[i];
 110                 ow->bv[i].bv_len = min(page_offset(ow->pages[i]) + PAGE_SIZE,
 111                     ow->off + ow->len) -
 112                     max(ow->off, page_offset(ow->pages[i]));
 113                 if (i == 0)
 114                         ow->bv[i].bv_offset = ow->off -
 115                             page_offset(ow->pages[i]);
 116                 else
 117                         ow->bv[i].bv_offset = 0;
 118         }
 119         iov_iter_bvec(&iter, WRITE, ow->bv, ow->npages, ow->len);
 120
 121         WARN_ON(ow->off >= len);
 122         if (ow->off + ow->len > len)
 123                 ow->len = len - ow->off;
 124
 125         off = ow->off;
 126         wr.uid = ow->uid;
 127         wr.gid = ow->gid;
 128         ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, ow->len,
 129             0, &wr, NULL);
 130         if (ret < 0) {
 131                 for (i = 0; i < ow->npages; i++) {
 132                         SetPageError(ow->pages[i]);
 133                         mapping_set_error(ow->pages[i]->mapping, ret);
 134                         if (PagePrivate(ow->pages[i])) {
 135                                 wrp = (struct orangefs_write_range *)
 136                                     page_private(ow->pages[i]);
 137                                 ClearPagePrivate(ow->pages[i]);
 138                                 put_page(ow->pages[i]);
 139                                 kfree(wrp);
 140                         }
 141                         end_page_writeback(ow->pages[i]);
 142                         unlock_page(ow->pages[i]);
 143                 }
 144         } else {
 145                 ret = 0;
 146                 for (i = 0; i < ow->npages; i++) {
 147                         if (PagePrivate(ow->pages[i])) {
 148                                 wrp = (struct orangefs_write_range *)
 149                                     page_private(ow->pages[i]);
 150                                 ClearPagePrivate(ow->pages[i]);
 151                                 put_page(ow->pages[i]);
 152                                 kfree(wrp);
 153                         }
 154                         end_page_writeback(ow->pages[i]);
 155                         unlock_page(ow->pages[i]);
 156                 }
 157         }
 158         return ret;
 159 }
 160
 161 static int orangefs_writepages_callback(struct page *page,
 162     struct writeback_control *wbc, void *data)
 163 {
 164         struct orangefs_writepages *ow = data;
 165         struct orangefs_write_range *wr;
 166         int ret;
 167
 168         if (!PagePrivate(page)) {
 169                 unlock_page(page);
 170                 /* It's not private so there's nothing to write, right? */
 171                 printk("writepages_callback not private!\n");
 172                 BUG();
 173                 return 0;
 174         }
 175         wr = (struct orangefs_write_range *)page_private(page);
 176
 177         ret = -1;
 178         if (ow->npages == 0) {
 179                 ow->off = wr->pos;
 180                 ow->len = wr->len;
 181                 ow->uid = wr->uid;
 182                 ow->gid = wr->gid;
 183                 ow->pages[ow->npages++] = page;
 184                 ret = 0;
 185                 goto done;
 186         }
 187         if (!uid_eq(ow->uid, wr->uid) || !gid_eq(ow->gid, wr->gid)) {
 188                 orangefs_writepages_work(ow, wbc);
 189                 ow->npages = 0;
 190                 ret = -1;
 191                 goto done;
 192         }
 193         if (ow->off + ow->len == wr->pos) {
 194                 ow->len += wr->len;
 195                 ow->pages[ow->npages++] = page;
 196                 ret = 0;
 197                 goto done;
 198         }
 199 done:
 200         if (ret == -1) {
 201                 if (ow->npages) {
 202                         orangefs_writepages_work(ow, wbc);
 203                         ow->npages = 0;
 204                 }
 205                 ret = orangefs_writepage_locked(page, wbc);
 206                 mapping_set_error(page->mapping, ret);
 207                 unlock_page(page);
 208                 end_page_writeback(page);
 209         } else {
 210                 if (ow->npages == ow->maxpages) {
 211                         orangefs_writepages_work(ow, wbc);
 212                         ow->npages = 0;
 213                 }
 214         }
 215         return ret;
 216 }
 217
 218 static int orangefs_writepages(struct address_space *mapping,
 219     struct writeback_control *wbc)
 220 {
 221         struct orangefs_writepages *ow;
 222         struct blk_plug plug;
 223         int ret;
 224         ow = kzalloc(sizeof(struct orangefs_writepages), GFP_KERNEL);
 225         if (!ow)
 226                 return -ENOMEM;
 227         ow->maxpages = orangefs_bufmap_size_query()/PAGE_SIZE;
 228         ow->pages = kcalloc(ow->maxpages, sizeof(struct page *), GFP_KERNEL);
 229         if (!ow->pages) {
 230                 kfree(ow);
 231                 return -ENOMEM;
 232         }
 233         ow->bv = kcalloc(ow->maxpages, sizeof(struct bio_vec), GFP_KERNEL);
 234         if (!ow->bv) {
 235                 kfree(ow->pages);
 236                 kfree(ow);
 237                 return -ENOMEM;
 238         }
 239         blk_start_plug(&plug);
 240         ret = write_cache_pages(mapping, wbc, orangefs_writepages_callback, ow);
 241         if (ow->npages)
 242                 ret = orangefs_writepages_work(ow, wbc);
 243         blk_finish_plug(&plug);
 244         kfree(ow->pages);
 245         kfree(ow->bv);
 246         kfree(ow);
 247         return ret;
 248 }
 249
 250 static int orangefs_launder_page(struct page *);
 251
 252 static int orangefs_readpage(struct file *file, struct page *page)
 253 {
 254         struct inode *inode = page->mapping->host;
 255         struct iov_iter iter;
 256         struct bio_vec bv;
 257         ssize_t ret;
 258         loff_t off; /* offset into this page */
 259         pgoff_t index; /* which page */
 260         struct page *next_page;
 261         char *kaddr;
 262         struct orangefs_read_options *ro = file->private_data;
 263         loff_t read_size;
 264         loff_t roundedup;
 265         int buffer_index = -1; /* orangefs shared memory slot */
 266         int slot_index;   /* index into slot */
 267         int remaining;
 268
 269         /*
 270          * If they set some miniscule size for "count" in read(2)
 271          * (for example) then let's try to read a page, or the whole file
 272          * if it is smaller than a page. Once "count" goes over a page
 273          * then lets round up to the highest page size multiple that is
 274          * less than or equal to "count" and do that much orangefs IO and
 275          * try to fill as many pages as we can from it.
 276          *
 277          * "count" should be represented in ro->blksiz.
 278          *
 279          * inode->i_size = file size.
 280          */
 281         if (ro) {
 282                 if (ro->blksiz < PAGE_SIZE) {
 283                         if (inode->i_size < PAGE_SIZE)
 284                                 read_size = inode->i_size;
 285                         else
 286                                 read_size = PAGE_SIZE;
 287                 } else {
 288                         roundedup = ((PAGE_SIZE - 1) & ro->blksiz) ?
 289                                 ((ro->blksiz + PAGE_SIZE) & ~(PAGE_SIZE -1)) :
 290                                 ro->blksiz;
 291                         if (roundedup > inode->i_size)
 292                                 read_size = inode->i_size;
 293                         else
 294                                 read_size = roundedup;
 295
 296                 }
 297         } else {
 298                 read_size = PAGE_SIZE;
 299         }
 300         if (!read_size)
 301                 read_size = PAGE_SIZE;
 302
 303         if (PageDirty(page))
 304                 orangefs_launder_page(page);
 305
 306         off = page_offset(page);
 307         index = off >> PAGE_SHIFT;
 308         bv.bv_page = page;
 309         bv.bv_len = PAGE_SIZE;
 310         bv.bv_offset = 0;
 311         iov_iter_bvec(&iter, READ, &bv, 1, PAGE_SIZE);
 312
 313         ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, &off, &iter,
 314             read_size, inode->i_size, NULL, &buffer_index);
 315         remaining = ret;
 316         /* this will only zero remaining unread portions of the page data */
 317         iov_iter_zero(~0U, &iter);
 318         /* takes care of potential aliasing */
 319         flush_dcache_page(page);
 320         if (ret < 0) {
 321                 SetPageError(page);
 322                 unlock_page(page);
 323                 goto out;
 324         } else {
 325                 SetPageUptodate(page);
 326                 if (PageError(page))
 327                         ClearPageError(page);
 328                 ret = 0;
 329         }
 330         /* unlock the page after the ->readpage() routine completes */
 331         unlock_page(page);
 332
 333         if (remaining > PAGE_SIZE) {
 334                 slot_index = 0;
 335                 while ((remaining - PAGE_SIZE) >= PAGE_SIZE) {
 336                         remaining -= PAGE_SIZE;
 337                         /*
 338                          * It is an optimization to try and fill more than one
 339                          * page... by now we've already gotten the single
 340                          * page we were after, if stuff doesn't seem to
 341                          * be going our way at this point just return
 342                          * and hope for the best.
 343                          *
 344                          * If we look for pages and they're already there is
 345                          * one reason to give up, and if they're not there
 346                          * and we can't create them is another reason.
 347                          */
 348
 349                         index++;
 350                         slot_index++;
 351                         next_page = find_get_page(inode->i_mapping, index);
 352                         if (next_page) {
 353                                 gossip_debug(GOSSIP_FILE_DEBUG,
 354                                         "%s: found next page, quitting\n",
 355                                         __func__);
 356                                 put_page(next_page);
 357                                 goto out;
 358                         }
 359                         next_page = find_or_create_page(inode->i_mapping,
 360                                                         index,
 361                                                         GFP_KERNEL);
 362                         /*
 363                          * I've never hit this, leave it as a printk for
 364                          * now so it will be obvious.
 365                          */
 366                         if (!next_page) {
 367                                 printk("%s: can't create next page, quitting\n",
 368                                         __func__);
 369                                 goto out;
 370                         }
 371                         kaddr = kmap_atomic(next_page);
 372                         orangefs_bufmap_page_fill(kaddr,
 373                                                 buffer_index,
 374                                                 slot_index);
 375                         kunmap_atomic(kaddr);
 376                         SetPageUptodate(next_page);
 377                         unlock_page(next_page);
 378                         put_page(next_page);
 379                 }
 380         }
 381
 382 out:
 383         if (buffer_index != -1)
 384                 orangefs_bufmap_put(buffer_index);
 385         return ret;
 386 }
 387
 388 static int orangefs_write_begin(struct file *file,
 389     struct address_space *mapping,
 390     loff_t pos, unsigned len, unsigned flags, struct page **pagep,
 391     void **fsdata)
 392 {
 393         struct orangefs_write_range *wr;
 394         struct page *page;
 395         pgoff_t index;
 396         int ret;
 397
 398         index = pos >> PAGE_SHIFT;
 399
 400         page = grab_cache_page_write_begin(mapping, index, flags);
 401         if (!page)
 402                 return -ENOMEM;
 403
 404         *pagep = page;
 405
 406         if (PageDirty(page) && !PagePrivate(page)) {
 407                 /*
 408                  * Should be impossible.  If it happens, launder the page
 409                  * since we don't know what's dirty.  This will WARN in
 410                  * orangefs_writepage_locked.
 411                  */
 412                 ret = orangefs_launder_page(page);
 413                 if (ret)
 414                         return ret;
 415         }
 416         if (PagePrivate(page)) {
 417                 struct orangefs_write_range *wr;
 418                 wr = (struct orangefs_write_range *)page_private(page);
 419                 if (wr->pos + wr->len == pos &&
 420                     uid_eq(wr->uid, current_fsuid()) &&
 421                     gid_eq(wr->gid, current_fsgid())) {
 422                         wr->len += len;
 423                         goto okay;
 424                 } else {
 425                         ret = orangefs_launder_page(page);
 426                         if (ret)
 427                                 return ret;
 428                 }
 429         }
 430
 431         wr = kmalloc(sizeof *wr, GFP_KERNEL);
 432         if (!wr)
 433                 return -ENOMEM;
 434
 435         wr->pos = pos;
 436         wr->len = len;
 437         wr->uid = current_fsuid();
 438         wr->gid = current_fsgid();
 439         SetPagePrivate(page);
 440         set_page_private(page, (unsigned long)wr);
 441         get_page(page);
 442 okay:
 443         return 0;
 444 }
 445
 446 static int orangefs_write_end(struct file *file, struct address_space *mapping,
 447     loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
 448 {
 449         struct inode *inode = page->mapping->host;
 450         loff_t last_pos = pos + copied;
 451
 452         /*
 453          * No need to use i_size_read() here, the i_size
 454          * cannot change under us because we hold the i_mutex.
 455          */
 456         if (last_pos > inode->i_size)
 457                 i_size_write(inode, last_pos);
 458
 459         /* zero the stale part of the page if we did a short copy */
 460         if (!PageUptodate(page)) {
 461                 unsigned from = pos & (PAGE_SIZE - 1);
 462                 if (copied < len) {
 463                         zero_user(page, from + copied, len - copied);
 464                 }
 465                 /* Set fully written pages uptodate. */
 466                 if (pos == page_offset(page) &&
 467                     (len == PAGE_SIZE || pos + len == inode->i_size)) {
 468                         zero_user_segment(page, from + copied, PAGE_SIZE);
 469                         SetPageUptodate(page);
 470                 }
 471         }
 472
 473         set_page_dirty(page);
 474         unlock_page(page);
 475         put_page(page);
 476
 477         mark_inode_dirty_sync(file_inode(file));
 478         return copied;
 479 }
 480
 481 static void orangefs_invalidatepage(struct page *page,
 482                                  unsigned int offset,
 483                                  unsigned int length)
 484 {
 485         struct orangefs_write_range *wr;
 486         wr = (struct orangefs_write_range *)page_private(page);
 487
 488         if (offset == 0 && length == PAGE_SIZE) {
 489                 kfree((struct orangefs_write_range *)page_private(page));
 490                 set_page_private(page, 0);
 491                 ClearPagePrivate(page);
 492                 put_page(page);
 493                 return;
 494         /* write range entirely within invalidate range (or equal) */
 495         } else if (page_offset(page) + offset <= wr->pos &&
 496             wr->pos + wr->len <= page_offset(page) + offset + length) {
 497                 kfree((struct orangefs_write_range *)page_private(page));
 498                 set_page_private(page, 0);
 499                 ClearPagePrivate(page);
 500                 put_page(page);
 501                 /* XXX is this right? only caller in fs */
 502                 cancel_dirty_page(page);
 503                 return;
 504         /* invalidate range chops off end of write range */
 505         } else if (wr->pos < page_offset(page) + offset &&
 506             wr->pos + wr->len <= page_offset(page) + offset + length &&
 507              page_offset(page) + offset < wr->pos + wr->len) {
 508                 size_t x;
 509                 x = wr->pos + wr->len - (page_offset(page) + offset);
 510                 WARN_ON(x > wr->len);
 511                 wr->len -= x;
 512                 wr->uid = current_fsuid();
 513                 wr->gid = current_fsgid();
 514         /* invalidate range chops off beginning of write range */
 515         } else if (page_offset(page) + offset <= wr->pos &&
 516             page_offset(page) + offset + length < wr->pos + wr->len &&
 517             wr->pos < page_offset(page) + offset + length) {
 518                 size_t x;
 519                 x = page_offset(page) + offset + length - wr->pos;
 520                 WARN_ON(x > wr->len);
 521                 wr->pos += x;
 522                 wr->len -= x;
 523                 wr->uid = current_fsuid();
 524                 wr->gid = current_fsgid();
 525         /* invalidate range entirely within write range (punch hole) */
 526         } else if (wr->pos < page_offset(page) + offset &&
 527             page_offset(page) + offset + length < wr->pos + wr->len) {
 528                 /* XXX what do we do here... should not WARN_ON */
 529                 WARN_ON(1);
 530                 /* punch hole */
 531                 /*
 532                  * should we just ignore this and write it out anyway?
 533                  * it hardly makes sense
 534                  */
 535                 return;
 536         /* non-overlapping ranges */
 537         } else {
 538                 /* WARN if they do overlap */
 539                 if (!((page_offset(page) + offset + length <= wr->pos) ^
 540                     (wr->pos + wr->len <= page_offset(page) + offset))) {
 541                         WARN_ON(1);
 542                         printk("invalidate range offset %llu length %u\n",
 543                             page_offset(page) + offset, length);
 544                         printk("write range offset %llu length %zu\n",
 545                             wr->pos, wr->len);
 546                 }
 547                 return;
 548         }
 549
 550         /*
 551          * Above there are returns where wr is freed or where we WARN.
 552          * Thus the following runs if wr was modified above.
 553          */
 554
 555         orangefs_launder_page(page);
 556 }
 557
 558 static int orangefs_releasepage(struct page *page, gfp_t foo)
 559 {
 560         return !PagePrivate(page);
 561 }
 562
 563 static void orangefs_freepage(struct page *page)
 564 {
 565         if (PagePrivate(page)) {
 566                 kfree((struct orangefs_write_range *)page_private(page));
 567                 set_page_private(page, 0);
 568                 ClearPagePrivate(page);
 569                 put_page(page);
 570         }
 571 }
 572
 573 static int orangefs_launder_page(struct page *page)
 574 {
 575         int r = 0;
 576         struct writeback_control wbc = {
 577                 .sync_mode = WB_SYNC_ALL,
 578                 .nr_to_write = 0,
 579         };
 580         wait_on_page_writeback(page);
 581         if (clear_page_dirty_for_io(page)) {
 582                 r = orangefs_writepage_locked(page, &wbc);
 583                 end_page_writeback(page);
 584         }
 585         return r;
 586 }
 587
 588 static ssize_t orangefs_direct_IO(struct kiocb *iocb,
 589                                   struct iov_iter *iter)
 590 {
 591         /*
 592          * Comment from original do_readv_writev:
 593          * Common entry point for read/write/readv/writev
 594          * This function will dispatch it to either the direct I/O
 595          * or buffered I/O path depending on the mount options and/or
 596          * augmented/extended metadata attached to the file.
 597          * Note: File extended attributes override any mount options.
 598          */
 599         struct file *file = iocb->ki_filp;
 600         loff_t pos = iocb->ki_pos;
 601         enum ORANGEFS_io_type type = iov_iter_rw(iter) == WRITE ?
 602             ORANGEFS_IO_WRITE : ORANGEFS_IO_READ;
 603         loff_t *offset = &pos;
 604         struct inode *inode = file->f_mapping->host;
 605         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 606         struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
 607         size_t count = iov_iter_count(iter);
 608         ssize_t total_count = 0;
 609         ssize_t ret = -EINVAL;
 610         int i = 0;
 611
 612         gossip_debug(GOSSIP_FILE_DEBUG,
 613                 "%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
 614                 __func__,
 615                 handle,
 616                 (int)count);
 617
 618         if (type == ORANGEFS_IO_WRITE) {
 619                 gossip_debug(GOSSIP_FILE_DEBUG,
 620                              "%s(%pU): proceeding with offset : %llu, "
 621                              "size %d\n",
 622                              __func__,
 623                              handle,
 624                              llu(*offset),
 625                              (int)count);
 626         }
 627
 628         if (count == 0) {
 629                 ret = 0;
 630                 goto out;
 631         }
 632
 633         while (iov_iter_count(iter)) {
 634                 size_t each_count = iov_iter_count(iter);
 635                 size_t amt_complete;
 636                 i++;
 637
 638                 /* how much to transfer in this loop iteration */
 639                 if (each_count > orangefs_bufmap_size_query())
 640                         each_count = orangefs_bufmap_size_query();
 641
 642                 gossip_debug(GOSSIP_FILE_DEBUG,
 643                              "%s(%pU): size of each_count(%d)\n",
 644                              __func__,
 645                              handle,
 646                              (int)each_count);
 647                 gossip_debug(GOSSIP_FILE_DEBUG,
 648                              "%s(%pU): BEFORE wait_for_io: offset is %d\n",
 649                              __func__,
 650                              handle,
 651                              (int)*offset);
 652
 653                 ret = wait_for_direct_io(type, inode, offset, iter,
 654                                 each_count, 0, NULL, NULL);
 655                 gossip_debug(GOSSIP_FILE_DEBUG,
 656                              "%s(%pU): return from wait_for_io:%d\n",
 657                              __func__,
 658                              handle,
 659                              (int)ret);
 660
 661                 if (ret < 0)
 662                         goto out;
 663
 664                 *offset += ret;
 665                 total_count += ret;
 666                 amt_complete = ret;
 667
 668                 gossip_debug(GOSSIP_FILE_DEBUG,
 669                              "%s(%pU): AFTER wait_for_io: offset is %d\n",
 670                              __func__,
 671                              handle,
 672                              (int)*offset);
 673
 674                 /*
 675                  * if we got a short I/O operations,
 676                  * fall out and return what we got so far
 677                  */
 678                 if (amt_complete < each_count)
 679                         break;
 680         } /*end while */
 681
 682 out:
 683         if (total_count > 0)
 684                 ret = total_count;
 685         if (ret > 0) {
 686                 if (type == ORANGEFS_IO_READ) {
 687                         file_accessed(file);
 688                 } else {
 689                         file_update_time(file);
 690                         if (*offset > i_size_read(inode))
 691                                 i_size_write(inode, *offset);
 692                 }
 693         }
 694
 695         gossip_debug(GOSSIP_FILE_DEBUG,
 696                      "%s(%pU): Value(%d) returned.\n",
 697                      __func__,
 698                      handle,
 699                      (int)ret);
 700
 701         return ret;
 702 }
 703
 704 /** ORANGEFS2 implementation of address space operations */
 705 static const struct address_space_operations orangefs_address_operations = {
 706         .writepage = orangefs_writepage,
 707         .readpage = orangefs_readpage,
 708         .writepages = orangefs_writepages,
 709         .set_page_dirty = __set_page_dirty_nobuffers,
 710         .write_begin = orangefs_write_begin,
 711         .write_end = orangefs_write_end,
 712         .invalidatepage = orangefs_invalidatepage,
 713         .releasepage = orangefs_releasepage,
 714         .freepage = orangefs_freepage,
 715         .launder_page = orangefs_launder_page,
 716         .direct_IO = orangefs_direct_IO,
 717 };
 718
 719 vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
 720 {
 721         struct page *page = vmf->page;
 722         struct inode *inode = file_inode(vmf->vma->vm_file);
 723         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 724         unsigned long *bitlock = &orangefs_inode->bitlock;
 725         vm_fault_t ret;
 726         struct orangefs_write_range *wr;
 727
 728         sb_start_pagefault(inode->i_sb);
 729
 730         if (wait_on_bit(bitlock, 1, TASK_KILLABLE)) {
 731                 ret = VM_FAULT_RETRY;
 732                 goto out;
 733         }
 734
 735         lock_page(page);
 736         if (PageDirty(page) && !PagePrivate(page)) {
 737                 /*
 738                  * Should be impossible.  If it happens, launder the page
 739                  * since we don't know what's dirty.  This will WARN in
 740                  * orangefs_writepage_locked.
 741                  */
 742                 if (orangefs_launder_page(page)) {
 743                         ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
 744                         goto out;
 745                 }
 746         }
 747         if (PagePrivate(page)) {
 748                 wr = (struct orangefs_write_range *)page_private(page);
 749                 if (uid_eq(wr->uid, current_fsuid()) &&
 750                     gid_eq(wr->gid, current_fsgid())) {
 751                         wr->pos = page_offset(page);
 752                         wr->len = PAGE_SIZE;
 753                         goto okay;
 754                 } else {
 755                         if (orangefs_launder_page(page)) {
 756                                 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
 757                                 goto out;
 758                         }
 759                 }
 760         }
 761         wr = kmalloc(sizeof *wr, GFP_KERNEL);
 762         if (!wr) {
 763                 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
 764                 goto out;
 765         }
 766         wr->pos = page_offset(page);
 767         wr->len = PAGE_SIZE;
 768         wr->uid = current_fsuid();
 769         wr->gid = current_fsgid();
 770         SetPagePrivate(page);
 771         set_page_private(page, (unsigned long)wr);
 772         get_page(page);
 773 okay:
 774
 775         file_update_time(vmf->vma->vm_file);
 776         if (page->mapping != inode->i_mapping) {
 777                 unlock_page(page);
 778                 ret = VM_FAULT_LOCKED|VM_FAULT_NOPAGE;
 779                 goto out;
 780         }
 781
 782         /*
 783          * We mark the page dirty already here so that when freeze is in
 784          * progress, we are guaranteed that writeback during freezing will
 785          * see the dirty page and writeprotect it again.
 786          */
 787         set_page_dirty(page);
 788         wait_for_stable_page(page);
 789         ret = VM_FAULT_LOCKED;
 790 out:
 791         sb_end_pagefault(inode->i_sb);
 792         return ret;
 793 }
 794
 795 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
 796 {
 797         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 798         struct orangefs_kernel_op_s *new_op;
 799         loff_t orig_size;
 800         int ret = -EINVAL;
 801
 802         gossip_debug(GOSSIP_INODE_DEBUG,
 803                      "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
 804                      __func__,
 805                      get_khandle_from_ino(inode),
 806                      &orangefs_inode->refn.khandle,
 807                      orangefs_inode->refn.fs_id,
 808                      iattr->ia_size);
 809
 810         /* Ensure that we have a up to date size, so we know if it changed. */
 811         ret = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_SIZE);
 812         if (ret == -ESTALE)
 813                 ret = -EIO;
 814         if (ret) {
 815                 gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
 816                     __func__, ret);
 817                 return ret;
 818         }
 819         orig_size = i_size_read(inode);
 820
 821         /* This is truncate_setsize in a different order. */
 822         truncate_pagecache(inode, iattr->ia_size);
 823         i_size_write(inode, iattr->ia_size);
 824         if (iattr->ia_size > orig_size)
 825                 pagecache_isize_extended(inode, orig_size, iattr->ia_size);
 826
 827         new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
 828         if (!new_op)
 829                 return -ENOMEM;
 830
 831         new_op->upcall.req.truncate.refn = orangefs_inode->refn;
 832         new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
 833
 834         ret = service_operation(new_op,
 835                 __func__,
 836                 get_interruptible_flag(inode));
 837
 838         /*
 839          * the truncate has no downcall members to retrieve, but
 840          * the status value tells us if it went through ok or not
 841          */
 842         gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
 843
 844         op_release(new_op);
 845
 846         if (ret != 0)
 847                 return ret;
 848
 849         if (orig_size != i_size_read(inode))
 850                 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
 851
 852         return ret;
 853 }
 854
 855 int __orangefs_setattr(struct inode *inode, struct iattr *iattr)
 856 {
 857         int ret;
 858
 859         if (iattr->ia_valid & ATTR_MODE) {
 860                 if (iattr->ia_mode & (S_ISVTX)) {
 861                         if (is_root_handle(inode)) {
 862                                 /*
 863                                  * allow sticky bit to be set on root (since
 864                                  * it shows up that way by default anyhow),
 865                                  * but don't show it to the server
 866                                  */
 867                                 iattr->ia_mode -= S_ISVTX;
 868                         } else {
 869                                 gossip_debug(GOSSIP_UTILS_DEBUG,
 870                                              "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
 871                                 ret = -EINVAL;
 872                                 goto out;
 873                         }
 874                 }
 875                 if (iattr->ia_mode & (S_ISUID)) {
 876                         gossip_debug(GOSSIP_UTILS_DEBUG,
 877                                      "Attempting to set setuid bit (not supported); returning EINVAL.\n");
 878                         ret = -EINVAL;
 879                         goto out;
 880                 }
 881         }
 882
 883         if (iattr->ia_valid & ATTR_SIZE) {
 884                 ret = orangefs_setattr_size(inode, iattr);
 885                 if (ret)
 886                         goto out;
 887         }
 888
 889 again:
 890         spin_lock(&inode->i_lock);
 891         if (ORANGEFS_I(inode)->attr_valid) {
 892                 if (uid_eq(ORANGEFS_I(inode)->attr_uid, current_fsuid()) &&
 893                     gid_eq(ORANGEFS_I(inode)->attr_gid, current_fsgid())) {
 894                         ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
 895                 } else {
 896                         spin_unlock(&inode->i_lock);
 897                         write_inode_now(inode, 1);
 898                         goto again;
 899                 }
 900         } else {
 901                 ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
 902                 ORANGEFS_I(inode)->attr_uid = current_fsuid();
 903                 ORANGEFS_I(inode)->attr_gid = current_fsgid();
 904         }
 905         setattr_copy(inode, iattr);
 906         spin_unlock(&inode->i_lock);
 907         mark_inode_dirty(inode);
 908
 909         if (iattr->ia_valid & ATTR_MODE)
 910                 /* change mod on a file that has ACLs */
 911                 ret = posix_acl_chmod(inode, inode->i_mode);
 912
 913         ret = 0;
 914 out:
 915         return ret;
 916 }
 917
 918 /*
 919  * Change attributes of an object referenced by dentry.
 920  */
 921 int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
 922 {
 923         int ret;
 924         gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
 925             dentry);
 926         ret = setattr_prepare(dentry, iattr);
 927         if (ret)
 928                 goto out;
 929         ret = __orangefs_setattr(d_inode(dentry), iattr);
 930         sync_inode_metadata(d_inode(dentry), 1);
 931 out:
 932         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
 933             ret);
 934         return ret;
 935 }
 936
 937 /*
 938  * Obtain attributes of an object given a dentry
 939  */
 940 int orangefs_getattr(const struct path *path, struct kstat *stat,
 941                      u32 request_mask, unsigned int flags)
 942 {
 943         int ret = -ENOENT;
 944         struct inode *inode = path->dentry->d_inode;
 945
 946         gossip_debug(GOSSIP_INODE_DEBUG,
 947                      "orangefs_getattr: called on %pd mask %u\n",
 948                      path->dentry, request_mask);
 949
 950         ret = orangefs_inode_getattr(inode,
 951             request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
 952         if (ret == 0) {
 953                 generic_fillattr(inode, stat);
 954
 955                 /* override block size reported to stat */
 956                 if (!(request_mask & STATX_SIZE))
 957                         stat->result_mask &= ~STATX_SIZE;
 958
 959                 stat->attributes_mask = STATX_ATTR_IMMUTABLE |
 960                     STATX_ATTR_APPEND;
 961                 if (inode->i_flags & S_IMMUTABLE)
 962                         stat->attributes |= STATX_ATTR_IMMUTABLE;
 963                 if (inode->i_flags & S_APPEND)
 964                         stat->attributes |= STATX_ATTR_APPEND;
 965         }
 966         return ret;
 967 }
 968
 969 int orangefs_permission(struct inode *inode, int mask)
 970 {
 971         int ret;
 972
 973         if (mask & MAY_NOT_BLOCK)
 974                 return -ECHILD;
 975
 976         gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
 977
 978         /* Make sure the permission (and other common attrs) are up to date. */
 979         ret = orangefs_inode_getattr(inode, 0);
 980         if (ret < 0)
 981                 return ret;
 982
 983         return generic_permission(inode, mask);
 984 }
 985
 986 int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
 987 {
 988         struct iattr iattr;
 989         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
 990             get_khandle_from_ino(inode));
 991         generic_update_time(inode, time, flags);
 992         memset(&iattr, 0, sizeof iattr);
 993         if (flags & S_ATIME)
 994                 iattr.ia_valid |= ATTR_ATIME;
 995         if (flags & S_CTIME)
 996                 iattr.ia_valid |= ATTR_CTIME;
 997         if (flags & S_MTIME)
 998                 iattr.ia_valid |= ATTR_MTIME;
 999         return __orangefs_setattr(inode, &iattr);
1000 }
1001
1002 /* ORANGEFS2 implementation of VFS inode operations for files */
1003 static const struct inode_operations orangefs_file_inode_operations = {
1004         .get_acl = orangefs_get_acl,
1005         .set_acl = orangefs_set_acl,
1006         .setattr = orangefs_setattr,
1007         .getattr = orangefs_getattr,
1008         .listxattr = orangefs_listxattr,
1009         .permission = orangefs_permission,
1010         .update_time = orangefs_update_time,
1011 };
1012
1013 static int orangefs_init_iops(struct inode *inode)
1014 {
1015         inode->i_mapping->a_ops = &orangefs_address_operations;
1016
1017         switch (inode->i_mode & S_IFMT) {
1018         case S_IFREG:
1019                 inode->i_op = &orangefs_file_inode_operations;
1020                 inode->i_fop = &orangefs_file_operations;
1021                 break;
1022         case S_IFLNK:
1023                 inode->i_op = &orangefs_symlink_inode_operations;
1024                 break;
1025         case S_IFDIR:
1026                 inode->i_op = &orangefs_dir_inode_operations;
1027                 inode->i_fop = &orangefs_dir_operations;
1028                 break;
1029         default:
1030                 gossip_debug(GOSSIP_INODE_DEBUG,
1031                              "%s: unsupported mode\n",
1032                              __func__);
1033                 return -EINVAL;
1034         }
1035
1036         return 0;
1037 }
1038
1039 /*
1040  * Given an ORANGEFS object identifier (fsid, handle), convert it into
1041  * a ino_t type that will be used as a hash-index from where the handle will
1042  * be searched for in the VFS hash table of inodes.
1043  */
1044 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
1045 {
1046         if (!ref)
1047                 return 0;
1048         return orangefs_khandle_to_ino(&(ref->khandle));
1049 }
1050
1051 /*
1052  * Called to set up an inode from iget5_locked.
1053  */
1054 static int orangefs_set_inode(struct inode *inode, void *data)
1055 {
1056         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1057         ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
1058         ORANGEFS_I(inode)->refn.khandle = ref->khandle;
1059         ORANGEFS_I(inode)->attr_valid = 0;
1060         hash_init(ORANGEFS_I(inode)->xattr_cache);
1061         ORANGEFS_I(inode)->mapping_time = jiffies - 1;
1062         ORANGEFS_I(inode)->bitlock = 0;
1063         return 0;
1064 }
1065
1066 /*
1067  * Called to determine if handles match.
1068  */
1069 static int orangefs_test_inode(struct inode *inode, void *data)
1070 {
1071         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1072         struct orangefs_inode_s *orangefs_inode = NULL;
1073
1074         orangefs_inode = ORANGEFS_I(inode);
1075         /* test handles and fs_ids... */
1076         return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
1077                                 &(ref->khandle)) &&
1078                         orangefs_inode->refn.fs_id == ref->fs_id);
1079 }
1080
1081 /*
1082  * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
1083  * file handle.
1084  *
1085  * @sb: the file system super block instance.
1086  * @ref: The ORANGEFS object for which we are trying to locate an inode.
1087  */
1088 struct inode *orangefs_iget(struct super_block *sb,
1089                 struct orangefs_object_kref *ref)
1090 {
1091         struct inode *inode = NULL;
1092         unsigned long hash;
1093         int error;
1094
1095         hash = orangefs_handle_hash(ref);
1096         inode = iget5_locked(sb,
1097                         hash,
1098                         orangefs_test_inode,
1099                         orangefs_set_inode,
1100                         ref);
1101
1102         if (!inode)
1103                 return ERR_PTR(-ENOMEM);
1104
1105         if (!(inode->i_state & I_NEW))
1106                 return inode;
1107
1108         error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1109         if (error) {
1110                 iget_failed(inode);
1111                 return ERR_PTR(error);
1112         }
1113
1114         inode->i_ino = hash;    /* needed for stat etc */
1115         orangefs_init_iops(inode);
1116         unlock_new_inode(inode);
1117
1118         gossip_debug(GOSSIP_INODE_DEBUG,
1119                      "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
1120                      &ref->khandle,
1121                      ref->fs_id,
1122                      hash,
1123                      inode->i_ino);
1124
1125         return inode;
1126 }
1127
1128 /*
1129  * Allocate an inode for a newly created file and insert it into the inode hash.
1130  */
1131 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
1132                 int mode, dev_t dev, struct orangefs_object_kref *ref)
1133 {
1134         unsigned long hash = orangefs_handle_hash(ref);
1135         struct inode *inode;
1136         int error;
1137
1138         gossip_debug(GOSSIP_INODE_DEBUG,
1139                      "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
1140                      __func__,
1141                      sb,
1142                      MAJOR(dev),
1143                      MINOR(dev),
1144                      mode);
1145
1146         inode = new_inode(sb);
1147         if (!inode)
1148                 return ERR_PTR(-ENOMEM);
1149
1150         orangefs_set_inode(inode, ref);
1151         inode->i_ino = hash;    /* needed for stat etc */
1152
1153         error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1154         if (error)
1155                 goto out_iput;
1156
1157         orangefs_init_iops(inode);
1158         inode->i_rdev = dev;
1159
1160         error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
1161         if (error < 0)
1162                 goto out_iput;
1163
1164         gossip_debug(GOSSIP_INODE_DEBUG,
1165                      "Initializing ACL's for inode %pU\n",
1166                      get_khandle_from_ino(inode));
1167         orangefs_init_acl(inode, dir);
1168         return inode;
1169
1170 out_iput:
1171         iput(inode);
1172         return ERR_PTR(error);
1173 }