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/blkdev.h>
  14 #include <linux/fileattr.h>
  15 #include "protocol.h"
  16 #include "orangefs-kernel.h"
  17 #include "orangefs-bufmap.h"
  18
  19 static int orangefs_writepage_locked(struct page *page,
  20     struct writeback_control *wbc)
  21 {
  22         struct inode *inode = page->mapping->host;
  23         struct orangefs_write_range *wr = NULL;
  24         struct iov_iter iter;
  25         struct bio_vec bv;
  26         size_t len, wlen;
  27         ssize_t ret;
  28         loff_t off;
  29
  30         set_page_writeback(page);
  31
  32         len = i_size_read(inode);
  33         if (PagePrivate(page)) {
  34                 wr = (struct orangefs_write_range *)page_private(page);
  35                 WARN_ON(wr->pos >= len);
  36                 off = wr->pos;
  37                 if (off + wr->len > len)
  38                         wlen = len - off;
  39                 else
  40                         wlen = wr->len;
  41         } else {
  42                 WARN_ON(1);
  43                 off = page_offset(page);
  44                 if (off + PAGE_SIZE > len)
  45                         wlen = len - off;
  46                 else
  47                         wlen = PAGE_SIZE;
  48         }
  49         /* Should've been handled in orangefs_invalidate_folio. */
  50         WARN_ON(off == len || off + wlen > len);
  51
  52         WARN_ON(wlen == 0);
  53         bvec_set_page(&bv, page, wlen, off % PAGE_SIZE);
  54         iov_iter_bvec(&iter, ITER_SOURCE, &bv, 1, wlen);
  55
  56         ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, wlen,
  57             len, wr, NULL, NULL);
  58         if (ret < 0) {
  59                 SetPageError(page);
  60                 mapping_set_error(page->mapping, ret);
  61         } else {
  62                 ret = 0;
  63         }
  64         kfree(detach_page_private(page));
  65         return ret;
  66 }
  67
  68 static int orangefs_writepage(struct page *page, struct writeback_control *wbc)
  69 {
  70         int ret;
  71         ret = orangefs_writepage_locked(page, wbc);
  72         unlock_page(page);
  73         end_page_writeback(page);
  74         return ret;
  75 }
  76
  77 struct orangefs_writepages {
  78         loff_t off;
  79         size_t len;
  80         kuid_t uid;
  81         kgid_t gid;
  82         int maxpages;
  83         int npages;
  84         struct page **pages;
  85         struct bio_vec *bv;
  86 };
  87
  88 static int orangefs_writepages_work(struct orangefs_writepages *ow,
  89     struct writeback_control *wbc)
  90 {
  91         struct inode *inode = ow->pages[0]->mapping->host;
  92         struct orangefs_write_range *wrp, wr;
  93         struct iov_iter iter;
  94         ssize_t ret;
  95         size_t len;
  96         loff_t off;
  97         int i;
  98
  99         len = i_size_read(inode);
 100
 101         for (i = 0; i < ow->npages; i++) {
 102                 set_page_writeback(ow->pages[i]);
 103                 bvec_set_page(&ow->bv[i], ow->pages[i],
 104                               min(page_offset(ow->pages[i]) + PAGE_SIZE,
 105                                   ow->off + ow->len) -
 106                               max(ow->off, page_offset(ow->pages[i])),
 107                               i == 0 ? ow->off - page_offset(ow->pages[i]) : 0);
 108         }
 109         iov_iter_bvec(&iter, ITER_SOURCE, ow->bv, ow->npages, ow->len);
 110
 111         WARN_ON(ow->off >= len);
 112         if (ow->off + ow->len > len)
 113                 ow->len = len - ow->off;
 114
 115         off = ow->off;
 116         wr.uid = ow->uid;
 117         wr.gid = ow->gid;
 118         ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, ow->len,
 119             0, &wr, NULL, NULL);
 120         if (ret < 0) {
 121                 for (i = 0; i < ow->npages; i++) {
 122                         SetPageError(ow->pages[i]);
 123                         mapping_set_error(ow->pages[i]->mapping, ret);
 124                         if (PagePrivate(ow->pages[i])) {
 125                                 wrp = (struct orangefs_write_range *)
 126                                     page_private(ow->pages[i]);
 127                                 ClearPagePrivate(ow->pages[i]);
 128                                 put_page(ow->pages[i]);
 129                                 kfree(wrp);
 130                         }
 131                         end_page_writeback(ow->pages[i]);
 132                         unlock_page(ow->pages[i]);
 133                 }
 134         } else {
 135                 ret = 0;
 136                 for (i = 0; i < ow->npages; i++) {
 137                         if (PagePrivate(ow->pages[i])) {
 138                                 wrp = (struct orangefs_write_range *)
 139                                     page_private(ow->pages[i]);
 140                                 ClearPagePrivate(ow->pages[i]);
 141                                 put_page(ow->pages[i]);
 142                                 kfree(wrp);
 143                         }
 144                         end_page_writeback(ow->pages[i]);
 145                         unlock_page(ow->pages[i]);
 146                 }
 147         }
 148         return ret;
 149 }
 150
 151 static int orangefs_writepages_callback(struct folio *folio,
 152                 struct writeback_control *wbc, void *data)
 153 {
 154         struct orangefs_writepages *ow = data;
 155         struct orangefs_write_range *wr = folio->private;
 156         int ret;
 157
 158         if (!wr) {
 159                 folio_unlock(folio);
 160                 /* It's not private so there's nothing to write, right? */
 161                 printk("writepages_callback not private!\n");
 162                 BUG();
 163                 return 0;
 164         }
 165
 166         ret = -1;
 167         if (ow->npages == 0) {
 168                 ow->off = wr->pos;
 169                 ow->len = wr->len;
 170                 ow->uid = wr->uid;
 171                 ow->gid = wr->gid;
 172                 ow->pages[ow->npages++] = &folio->page;
 173                 ret = 0;
 174                 goto done;
 175         }
 176         if (!uid_eq(ow->uid, wr->uid) || !gid_eq(ow->gid, wr->gid)) {
 177                 orangefs_writepages_work(ow, wbc);
 178                 ow->npages = 0;
 179                 ret = -1;
 180                 goto done;
 181         }
 182         if (ow->off + ow->len == wr->pos) {
 183                 ow->len += wr->len;
 184                 ow->pages[ow->npages++] = &folio->page;
 185                 ret = 0;
 186                 goto done;
 187         }
 188 done:
 189         if (ret == -1) {
 190                 if (ow->npages) {
 191                         orangefs_writepages_work(ow, wbc);
 192                         ow->npages = 0;
 193                 }
 194                 ret = orangefs_writepage_locked(&folio->page, wbc);
 195                 mapping_set_error(folio->mapping, ret);
 196                 folio_unlock(folio);
 197                 folio_end_writeback(folio);
 198         } else {
 199                 if (ow->npages == ow->maxpages) {
 200                         orangefs_writepages_work(ow, wbc);
 201                         ow->npages = 0;
 202                 }
 203         }
 204         return ret;
 205 }
 206
 207 static int orangefs_writepages(struct address_space *mapping,
 208     struct writeback_control *wbc)
 209 {
 210         struct orangefs_writepages *ow;
 211         struct blk_plug plug;
 212         int ret;
 213         ow = kzalloc(sizeof(struct orangefs_writepages), GFP_KERNEL);
 214         if (!ow)
 215                 return -ENOMEM;
 216         ow->maxpages = orangefs_bufmap_size_query()/PAGE_SIZE;
 217         ow->pages = kcalloc(ow->maxpages, sizeof(struct page *), GFP_KERNEL);
 218         if (!ow->pages) {
 219                 kfree(ow);
 220                 return -ENOMEM;
 221         }
 222         ow->bv = kcalloc(ow->maxpages, sizeof(struct bio_vec), GFP_KERNEL);
 223         if (!ow->bv) {
 224                 kfree(ow->pages);
 225                 kfree(ow);
 226                 return -ENOMEM;
 227         }
 228         blk_start_plug(&plug);
 229         ret = write_cache_pages(mapping, wbc, orangefs_writepages_callback, ow);
 230         if (ow->npages)
 231                 ret = orangefs_writepages_work(ow, wbc);
 232         blk_finish_plug(&plug);
 233         kfree(ow->pages);
 234         kfree(ow->bv);
 235         kfree(ow);
 236         return ret;
 237 }
 238
 239 static int orangefs_launder_folio(struct folio *);
 240
 241 static void orangefs_readahead(struct readahead_control *rac)
 242 {
 243         loff_t offset;
 244         struct iov_iter iter;
 245         struct inode *inode = rac->mapping->host;
 246         struct xarray *i_pages;
 247         struct page *page;
 248         loff_t new_start = readahead_pos(rac);
 249         int ret;
 250         size_t new_len = 0;
 251
 252         loff_t bytes_remaining = inode->i_size - readahead_pos(rac);
 253         loff_t pages_remaining = bytes_remaining / PAGE_SIZE;
 254
 255         if (pages_remaining >= 1024)
 256                 new_len = 4194304;
 257         else if (pages_remaining > readahead_count(rac))
 258                 new_len = bytes_remaining;
 259
 260         if (new_len)
 261                 readahead_expand(rac, new_start, new_len);
 262
 263         offset = readahead_pos(rac);
 264         i_pages = &rac->mapping->i_pages;
 265
 266         iov_iter_xarray(&iter, ITER_DEST, i_pages, offset, readahead_length(rac));
 267
 268         /* read in the pages. */
 269         if ((ret = wait_for_direct_io(ORANGEFS_IO_READ, inode,
 270                         &offset, &iter, readahead_length(rac),
 271                         inode->i_size, NULL, NULL, rac->file)) < 0)
 272                 gossip_debug(GOSSIP_FILE_DEBUG,
 273                         "%s: wait_for_direct_io failed. \n", __func__);
 274         else
 275                 ret = 0;
 276
 277         /* clean up. */
 278         while ((page = readahead_page(rac))) {
 279                 page_endio(page, false, ret);
 280                 put_page(page);
 281         }
 282 }
 283
 284 static int orangefs_read_folio(struct file *file, struct folio *folio)
 285 {
 286         struct inode *inode = folio->mapping->host;
 287         struct iov_iter iter;
 288         struct bio_vec bv;
 289         ssize_t ret;
 290         loff_t off; /* offset of this folio in the file */
 291
 292         if (folio_test_dirty(folio))
 293                 orangefs_launder_folio(folio);
 294
 295         off = folio_pos(folio);
 296         bvec_set_folio(&bv, folio, folio_size(folio), 0);
 297         iov_iter_bvec(&iter, ITER_DEST, &bv, 1, folio_size(folio));
 298
 299         ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, &off, &iter,
 300                         folio_size(folio), inode->i_size, NULL, NULL, file);
 301         /* this will only zero remaining unread portions of the folio data */
 302         iov_iter_zero(~0U, &iter);
 303         /* takes care of potential aliasing */
 304         flush_dcache_folio(folio);
 305         if (ret < 0) {
 306                 folio_set_error(folio);
 307         } else {
 308                 folio_mark_uptodate(folio);
 309                 ret = 0;
 310         }
 311         /* unlock the folio after the ->read_folio() routine completes */
 312         folio_unlock(folio);
 313         return ret;
 314 }
 315
 316 static int orangefs_write_begin(struct file *file,
 317                 struct address_space *mapping, loff_t pos, unsigned len,
 318                 struct page **pagep, void **fsdata)
 319 {
 320         struct orangefs_write_range *wr;
 321         struct folio *folio;
 322         struct page *page;
 323         pgoff_t index;
 324         int ret;
 325
 326         index = pos >> PAGE_SHIFT;
 327
 328         page = grab_cache_page_write_begin(mapping, index);
 329         if (!page)
 330                 return -ENOMEM;
 331
 332         *pagep = page;
 333         folio = page_folio(page);
 334
 335         if (folio_test_dirty(folio) && !folio_test_private(folio)) {
 336                 /*
 337                  * Should be impossible.  If it happens, launder the page
 338                  * since we don't know what's dirty.  This will WARN in
 339                  * orangefs_writepage_locked.
 340                  */
 341                 ret = orangefs_launder_folio(folio);
 342                 if (ret)
 343                         return ret;
 344         }
 345         if (folio_test_private(folio)) {
 346                 struct orangefs_write_range *wr;
 347                 wr = folio_get_private(folio);
 348                 if (wr->pos + wr->len == pos &&
 349                     uid_eq(wr->uid, current_fsuid()) &&
 350                     gid_eq(wr->gid, current_fsgid())) {
 351                         wr->len += len;
 352                         goto okay;
 353                 } else {
 354                         ret = orangefs_launder_folio(folio);
 355                         if (ret)
 356                                 return ret;
 357                 }
 358         }
 359
 360         wr = kmalloc(sizeof *wr, GFP_KERNEL);
 361         if (!wr)
 362                 return -ENOMEM;
 363
 364         wr->pos = pos;
 365         wr->len = len;
 366         wr->uid = current_fsuid();
 367         wr->gid = current_fsgid();
 368         folio_attach_private(folio, wr);
 369 okay:
 370         return 0;
 371 }
 372
 373 static int orangefs_write_end(struct file *file, struct address_space *mapping,
 374     loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
 375 {
 376         struct inode *inode = page->mapping->host;
 377         loff_t last_pos = pos + copied;
 378
 379         /*
 380          * No need to use i_size_read() here, the i_size
 381          * cannot change under us because we hold the i_mutex.
 382          */
 383         if (last_pos > inode->i_size)
 384                 i_size_write(inode, last_pos);
 385
 386         /* zero the stale part of the page if we did a short copy */
 387         if (!PageUptodate(page)) {
 388                 unsigned from = pos & (PAGE_SIZE - 1);
 389                 if (copied < len) {
 390                         zero_user(page, from + copied, len - copied);
 391                 }
 392                 /* Set fully written pages uptodate. */
 393                 if (pos == page_offset(page) &&
 394                     (len == PAGE_SIZE || pos + len == inode->i_size)) {
 395                         zero_user_segment(page, from + copied, PAGE_SIZE);
 396                         SetPageUptodate(page);
 397                 }
 398         }
 399
 400         set_page_dirty(page);
 401         unlock_page(page);
 402         put_page(page);
 403
 404         mark_inode_dirty_sync(file_inode(file));
 405         return copied;
 406 }
 407
 408 static void orangefs_invalidate_folio(struct folio *folio,
 409                                  size_t offset, size_t length)
 410 {
 411         struct orangefs_write_range *wr = folio_get_private(folio);
 412
 413         if (offset == 0 && length == PAGE_SIZE) {
 414                 kfree(folio_detach_private(folio));
 415                 return;
 416         /* write range entirely within invalidate range (or equal) */
 417         } else if (folio_pos(folio) + offset <= wr->pos &&
 418             wr->pos + wr->len <= folio_pos(folio) + offset + length) {
 419                 kfree(folio_detach_private(folio));
 420                 /* XXX is this right? only caller in fs */
 421                 folio_cancel_dirty(folio);
 422                 return;
 423         /* invalidate range chops off end of write range */
 424         } else if (wr->pos < folio_pos(folio) + offset &&
 425             wr->pos + wr->len <= folio_pos(folio) + offset + length &&
 426              folio_pos(folio) + offset < wr->pos + wr->len) {
 427                 size_t x;
 428                 x = wr->pos + wr->len - (folio_pos(folio) + offset);
 429                 WARN_ON(x > wr->len);
 430                 wr->len -= x;
 431                 wr->uid = current_fsuid();
 432                 wr->gid = current_fsgid();
 433         /* invalidate range chops off beginning of write range */
 434         } else if (folio_pos(folio) + offset <= wr->pos &&
 435             folio_pos(folio) + offset + length < wr->pos + wr->len &&
 436             wr->pos < folio_pos(folio) + offset + length) {
 437                 size_t x;
 438                 x = folio_pos(folio) + offset + length - wr->pos;
 439                 WARN_ON(x > wr->len);
 440                 wr->pos += x;
 441                 wr->len -= x;
 442                 wr->uid = current_fsuid();
 443                 wr->gid = current_fsgid();
 444         /* invalidate range entirely within write range (punch hole) */
 445         } else if (wr->pos < folio_pos(folio) + offset &&
 446             folio_pos(folio) + offset + length < wr->pos + wr->len) {
 447                 /* XXX what do we do here... should not WARN_ON */
 448                 WARN_ON(1);
 449                 /* punch hole */
 450                 /*
 451                  * should we just ignore this and write it out anyway?
 452                  * it hardly makes sense
 453                  */
 454                 return;
 455         /* non-overlapping ranges */
 456         } else {
 457                 /* WARN if they do overlap */
 458                 if (!((folio_pos(folio) + offset + length <= wr->pos) ^
 459                     (wr->pos + wr->len <= folio_pos(folio) + offset))) {
 460                         WARN_ON(1);
 461                         printk("invalidate range offset %llu length %zu\n",
 462                             folio_pos(folio) + offset, length);
 463                         printk("write range offset %llu length %zu\n",
 464                             wr->pos, wr->len);
 465                 }
 466                 return;
 467         }
 468
 469         /*
 470          * Above there are returns where wr is freed or where we WARN.
 471          * Thus the following runs if wr was modified above.
 472          */
 473
 474         orangefs_launder_folio(folio);
 475 }
 476
 477 static bool orangefs_release_folio(struct folio *folio, gfp_t foo)
 478 {
 479         return !folio_test_private(folio);
 480 }
 481
 482 static void orangefs_free_folio(struct folio *folio)
 483 {
 484         kfree(folio_detach_private(folio));
 485 }
 486
 487 static int orangefs_launder_folio(struct folio *folio)
 488 {
 489         int r = 0;
 490         struct writeback_control wbc = {
 491                 .sync_mode = WB_SYNC_ALL,
 492                 .nr_to_write = 0,
 493         };
 494         folio_wait_writeback(folio);
 495         if (folio_clear_dirty_for_io(folio)) {
 496                 r = orangefs_writepage_locked(&folio->page, &wbc);
 497                 folio_end_writeback(folio);
 498         }
 499         return r;
 500 }
 501
 502 static ssize_t orangefs_direct_IO(struct kiocb *iocb,
 503                                   struct iov_iter *iter)
 504 {
 505         /*
 506          * Comment from original do_readv_writev:
 507          * Common entry point for read/write/readv/writev
 508          * This function will dispatch it to either the direct I/O
 509          * or buffered I/O path depending on the mount options and/or
 510          * augmented/extended metadata attached to the file.
 511          * Note: File extended attributes override any mount options.
 512          */
 513         struct file *file = iocb->ki_filp;
 514         loff_t pos = iocb->ki_pos;
 515         enum ORANGEFS_io_type type = iov_iter_rw(iter) == WRITE ?
 516             ORANGEFS_IO_WRITE : ORANGEFS_IO_READ;
 517         loff_t *offset = &pos;
 518         struct inode *inode = file->f_mapping->host;
 519         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 520         struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
 521         size_t count = iov_iter_count(iter);
 522         ssize_t total_count = 0;
 523         ssize_t ret = -EINVAL;
 524
 525         gossip_debug(GOSSIP_FILE_DEBUG,
 526                 "%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
 527                 __func__,
 528                 handle,
 529                 (int)count);
 530
 531         if (type == ORANGEFS_IO_WRITE) {
 532                 gossip_debug(GOSSIP_FILE_DEBUG,
 533                              "%s(%pU): proceeding with offset : %llu, "
 534                              "size %d\n",
 535                              __func__,
 536                              handle,
 537                              llu(*offset),
 538                              (int)count);
 539         }
 540
 541         if (count == 0) {
 542                 ret = 0;
 543                 goto out;
 544         }
 545
 546         while (iov_iter_count(iter)) {
 547                 size_t each_count = iov_iter_count(iter);
 548                 size_t amt_complete;
 549
 550                 /* how much to transfer in this loop iteration */
 551                 if (each_count > orangefs_bufmap_size_query())
 552                         each_count = orangefs_bufmap_size_query();
 553
 554                 gossip_debug(GOSSIP_FILE_DEBUG,
 555                              "%s(%pU): size of each_count(%d)\n",
 556                              __func__,
 557                              handle,
 558                              (int)each_count);
 559                 gossip_debug(GOSSIP_FILE_DEBUG,
 560                              "%s(%pU): BEFORE wait_for_io: offset is %d\n",
 561                              __func__,
 562                              handle,
 563                              (int)*offset);
 564
 565                 ret = wait_for_direct_io(type, inode, offset, iter,
 566                                 each_count, 0, NULL, NULL, file);
 567                 gossip_debug(GOSSIP_FILE_DEBUG,
 568                              "%s(%pU): return from wait_for_io:%d\n",
 569                              __func__,
 570                              handle,
 571                              (int)ret);
 572
 573                 if (ret < 0)
 574                         goto out;
 575
 576                 *offset += ret;
 577                 total_count += ret;
 578                 amt_complete = ret;
 579
 580                 gossip_debug(GOSSIP_FILE_DEBUG,
 581                              "%s(%pU): AFTER wait_for_io: offset is %d\n",
 582                              __func__,
 583                              handle,
 584                              (int)*offset);
 585
 586                 /*
 587                  * if we got a short I/O operations,
 588                  * fall out and return what we got so far
 589                  */
 590                 if (amt_complete < each_count)
 591                         break;
 592         } /*end while */
 593
 594 out:
 595         if (total_count > 0)
 596                 ret = total_count;
 597         if (ret > 0) {
 598                 if (type == ORANGEFS_IO_READ) {
 599                         file_accessed(file);
 600                 } else {
 601                         file_update_time(file);
 602                         if (*offset > i_size_read(inode))
 603                                 i_size_write(inode, *offset);
 604                 }
 605         }
 606
 607         gossip_debug(GOSSIP_FILE_DEBUG,
 608                      "%s(%pU): Value(%d) returned.\n",
 609                      __func__,
 610                      handle,
 611                      (int)ret);
 612
 613         return ret;
 614 }
 615
 616 /** ORANGEFS2 implementation of address space operations */
 617 static const struct address_space_operations orangefs_address_operations = {
 618         .writepage = orangefs_writepage,
 619         .readahead = orangefs_readahead,
 620         .read_folio = orangefs_read_folio,
 621         .writepages = orangefs_writepages,
 622         .dirty_folio = filemap_dirty_folio,
 623         .write_begin = orangefs_write_begin,
 624         .write_end = orangefs_write_end,
 625         .invalidate_folio = orangefs_invalidate_folio,
 626         .release_folio = orangefs_release_folio,
 627         .free_folio = orangefs_free_folio,
 628         .launder_folio = orangefs_launder_folio,
 629         .direct_IO = orangefs_direct_IO,
 630 };
 631
 632 vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
 633 {
 634         struct folio *folio = page_folio(vmf->page);
 635         struct inode *inode = file_inode(vmf->vma->vm_file);
 636         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 637         unsigned long *bitlock = &orangefs_inode->bitlock;
 638         vm_fault_t ret;
 639         struct orangefs_write_range *wr;
 640
 641         sb_start_pagefault(inode->i_sb);
 642
 643         if (wait_on_bit(bitlock, 1, TASK_KILLABLE)) {
 644                 ret = VM_FAULT_RETRY;
 645                 goto out;
 646         }
 647
 648         folio_lock(folio);
 649         if (folio_test_dirty(folio) && !folio_test_private(folio)) {
 650                 /*
 651                  * Should be impossible.  If it happens, launder the folio
 652                  * since we don't know what's dirty.  This will WARN in
 653                  * orangefs_writepage_locked.
 654                  */
 655                 if (orangefs_launder_folio(folio)) {
 656                         ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
 657                         goto out;
 658                 }
 659         }
 660         if (folio_test_private(folio)) {
 661                 wr = folio_get_private(folio);
 662                 if (uid_eq(wr->uid, current_fsuid()) &&
 663                     gid_eq(wr->gid, current_fsgid())) {
 664                         wr->pos = page_offset(vmf->page);
 665                         wr->len = PAGE_SIZE;
 666                         goto okay;
 667                 } else {
 668                         if (orangefs_launder_folio(folio)) {
 669                                 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
 670                                 goto out;
 671                         }
 672                 }
 673         }
 674         wr = kmalloc(sizeof *wr, GFP_KERNEL);
 675         if (!wr) {
 676                 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
 677                 goto out;
 678         }
 679         wr->pos = page_offset(vmf->page);
 680         wr->len = PAGE_SIZE;
 681         wr->uid = current_fsuid();
 682         wr->gid = current_fsgid();
 683         folio_attach_private(folio, wr);
 684 okay:
 685
 686         file_update_time(vmf->vma->vm_file);
 687         if (folio->mapping != inode->i_mapping) {
 688                 folio_unlock(folio);
 689                 ret = VM_FAULT_LOCKED|VM_FAULT_NOPAGE;
 690                 goto out;
 691         }
 692
 693         /*
 694          * We mark the folio dirty already here so that when freeze is in
 695          * progress, we are guaranteed that writeback during freezing will
 696          * see the dirty folio and writeprotect it again.
 697          */
 698         folio_mark_dirty(folio);
 699         folio_wait_stable(folio);
 700         ret = VM_FAULT_LOCKED;
 701 out:
 702         sb_end_pagefault(inode->i_sb);
 703         return ret;
 704 }
 705
 706 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
 707 {
 708         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 709         struct orangefs_kernel_op_s *new_op;
 710         loff_t orig_size;
 711         int ret = -EINVAL;
 712
 713         gossip_debug(GOSSIP_INODE_DEBUG,
 714                      "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
 715                      __func__,
 716                      get_khandle_from_ino(inode),
 717                      &orangefs_inode->refn.khandle,
 718                      orangefs_inode->refn.fs_id,
 719                      iattr->ia_size);
 720
 721         /* Ensure that we have a up to date size, so we know if it changed. */
 722         ret = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_SIZE);
 723         if (ret == -ESTALE)
 724                 ret = -EIO;
 725         if (ret) {
 726                 gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
 727                     __func__, ret);
 728                 return ret;
 729         }
 730         orig_size = i_size_read(inode);
 731
 732         /* This is truncate_setsize in a different order. */
 733         truncate_pagecache(inode, iattr->ia_size);
 734         i_size_write(inode, iattr->ia_size);
 735         if (iattr->ia_size > orig_size)
 736                 pagecache_isize_extended(inode, orig_size, iattr->ia_size);
 737
 738         new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
 739         if (!new_op)
 740                 return -ENOMEM;
 741
 742         new_op->upcall.req.truncate.refn = orangefs_inode->refn;
 743         new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
 744
 745         ret = service_operation(new_op,
 746                 __func__,
 747                 get_interruptible_flag(inode));
 748
 749         /*
 750          * the truncate has no downcall members to retrieve, but
 751          * the status value tells us if it went through ok or not
 752          */
 753         gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
 754
 755         op_release(new_op);
 756
 757         if (ret != 0)
 758                 return ret;
 759
 760         if (orig_size != i_size_read(inode))
 761                 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
 762
 763         return ret;
 764 }
 765
 766 int __orangefs_setattr(struct inode *inode, struct iattr *iattr)
 767 {
 768         int ret;
 769
 770         if (iattr->ia_valid & ATTR_MODE) {
 771                 if (iattr->ia_mode & (S_ISVTX)) {
 772                         if (is_root_handle(inode)) {
 773                                 /*
 774                                  * allow sticky bit to be set on root (since
 775                                  * it shows up that way by default anyhow),
 776                                  * but don't show it to the server
 777                                  */
 778                                 iattr->ia_mode -= S_ISVTX;
 779                         } else {
 780                                 gossip_debug(GOSSIP_UTILS_DEBUG,
 781                                              "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
 782                                 ret = -EINVAL;
 783                                 goto out;
 784                         }
 785                 }
 786                 if (iattr->ia_mode & (S_ISUID)) {
 787                         gossip_debug(GOSSIP_UTILS_DEBUG,
 788                                      "Attempting to set setuid bit (not supported); returning EINVAL.\n");
 789                         ret = -EINVAL;
 790                         goto out;
 791                 }
 792         }
 793
 794         if (iattr->ia_valid & ATTR_SIZE) {
 795                 ret = orangefs_setattr_size(inode, iattr);
 796                 if (ret)
 797                         goto out;
 798         }
 799
 800 again:
 801         spin_lock(&inode->i_lock);
 802         if (ORANGEFS_I(inode)->attr_valid) {
 803                 if (uid_eq(ORANGEFS_I(inode)->attr_uid, current_fsuid()) &&
 804                     gid_eq(ORANGEFS_I(inode)->attr_gid, current_fsgid())) {
 805                         ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
 806                 } else {
 807                         spin_unlock(&inode->i_lock);
 808                         write_inode_now(inode, 1);
 809                         goto again;
 810                 }
 811         } else {
 812                 ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
 813                 ORANGEFS_I(inode)->attr_uid = current_fsuid();
 814                 ORANGEFS_I(inode)->attr_gid = current_fsgid();
 815         }
 816         setattr_copy(&nop_mnt_idmap, inode, iattr);
 817         spin_unlock(&inode->i_lock);
 818         mark_inode_dirty(inode);
 819
 820         ret = 0;
 821 out:
 822         return ret;
 823 }
 824
 825 int __orangefs_setattr_mode(struct dentry *dentry, struct iattr *iattr)
 826 {
 827         int ret;
 828         struct inode *inode = d_inode(dentry);
 829
 830         ret = __orangefs_setattr(inode, iattr);
 831         /* change mode on a file that has ACLs */
 832         if (!ret && (iattr->ia_valid & ATTR_MODE))
 833                 ret = posix_acl_chmod(&nop_mnt_idmap, dentry, inode->i_mode);
 834         return ret;
 835 }
 836
 837 /*
 838  * Change attributes of an object referenced by dentry.
 839  */
 840 int orangefs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 841                      struct iattr *iattr)
 842 {
 843         int ret;
 844         gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
 845             dentry);
 846         ret = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
 847         if (ret)
 848                 goto out;
 849         ret = __orangefs_setattr_mode(dentry, iattr);
 850         sync_inode_metadata(d_inode(dentry), 1);
 851 out:
 852         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
 853             ret);
 854         return ret;
 855 }
 856
 857 /*
 858  * Obtain attributes of an object given a dentry
 859  */
 860 int orangefs_getattr(struct mnt_idmap *idmap, const struct path *path,
 861                      struct kstat *stat, u32 request_mask, unsigned int flags)
 862 {
 863         int ret;
 864         struct inode *inode = path->dentry->d_inode;
 865
 866         gossip_debug(GOSSIP_INODE_DEBUG,
 867                      "orangefs_getattr: called on %pd mask %u\n",
 868                      path->dentry, request_mask);
 869
 870         ret = orangefs_inode_getattr(inode,
 871             request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
 872         if (ret == 0) {
 873                 generic_fillattr(&nop_mnt_idmap, inode, stat);
 874
 875                 /* override block size reported to stat */
 876                 if (!(request_mask & STATX_SIZE))
 877                         stat->result_mask &= ~STATX_SIZE;
 878
 879                 generic_fill_statx_attr(inode, stat);
 880         }
 881         return ret;
 882 }
 883
 884 int orangefs_permission(struct mnt_idmap *idmap,
 885                         struct inode *inode, int mask)
 886 {
 887         int ret;
 888
 889         if (mask & MAY_NOT_BLOCK)
 890                 return -ECHILD;
 891
 892         gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
 893
 894         /* Make sure the permission (and other common attrs) are up to date. */
 895         ret = orangefs_inode_getattr(inode, 0);
 896         if (ret < 0)
 897                 return ret;
 898
 899         return generic_permission(&nop_mnt_idmap, inode, mask);
 900 }
 901
 902 int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
 903 {
 904         struct iattr iattr;
 905         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
 906             get_khandle_from_ino(inode));
 907         generic_update_time(inode, time, flags);
 908         memset(&iattr, 0, sizeof iattr);
 909         if (flags & S_ATIME)
 910                 iattr.ia_valid |= ATTR_ATIME;
 911         if (flags & S_CTIME)
 912                 iattr.ia_valid |= ATTR_CTIME;
 913         if (flags & S_MTIME)
 914                 iattr.ia_valid |= ATTR_MTIME;
 915         return __orangefs_setattr(inode, &iattr);
 916 }
 917
 918 static int orangefs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 919 {
 920         u64 val = 0;
 921         int ret;
 922
 923         gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
 924                      dentry);
 925
 926         ret = orangefs_inode_getxattr(d_inode(dentry),
 927                                       "user.pvfs2.meta_hint",
 928                                       &val, sizeof(val));
 929         if (ret < 0 && ret != -ENODATA)
 930                 return ret;
 931
 932         gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
 933
 934         fileattr_fill_flags(fa, val);
 935         return 0;
 936 }
 937
 938 static int orangefs_fileattr_set(struct mnt_idmap *idmap,
 939                                  struct dentry *dentry, struct fileattr *fa)
 940 {
 941         u64 val = 0;
 942
 943         gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
 944                      dentry);
 945         /*
 946          * ORANGEFS_MIRROR_FL is set internally when the mirroring mode is
 947          * turned on for a file. The user is not allowed to turn on this bit,
 948          * but the bit is present if the user first gets the flags and then
 949          * updates the flags with some new settings. So, we ignore it in the
 950          * following edit. bligon.
 951          */
 952         if (fileattr_has_fsx(fa) ||
 953             (fa->flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NOATIME_FL | ORANGEFS_MIRROR_FL))) {
 954                 gossip_err("%s: only supports setting one of FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NOATIME_FL\n",
 955                            __func__);
 956                 return -EOPNOTSUPP;
 957         }
 958         val = fa->flags;
 959         gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
 960         return orangefs_inode_setxattr(d_inode(dentry),
 961                                        "user.pvfs2.meta_hint",
 962                                        &val, sizeof(val), 0);
 963 }
 964
 965 /* ORANGEFS2 implementation of VFS inode operations for files */
 966 static const struct inode_operations orangefs_file_inode_operations = {
 967         .get_inode_acl = orangefs_get_acl,
 968         .set_acl = orangefs_set_acl,
 969         .setattr = orangefs_setattr,
 970         .getattr = orangefs_getattr,
 971         .listxattr = orangefs_listxattr,
 972         .permission = orangefs_permission,
 973         .update_time = orangefs_update_time,
 974         .fileattr_get = orangefs_fileattr_get,
 975         .fileattr_set = orangefs_fileattr_set,
 976 };
 977
 978 static int orangefs_init_iops(struct inode *inode)
 979 {
 980         inode->i_mapping->a_ops = &orangefs_address_operations;
 981
 982         switch (inode->i_mode & S_IFMT) {
 983         case S_IFREG:
 984                 inode->i_op = &orangefs_file_inode_operations;
 985                 inode->i_fop = &orangefs_file_operations;
 986                 break;
 987         case S_IFLNK:
 988                 inode->i_op = &orangefs_symlink_inode_operations;
 989                 break;
 990         case S_IFDIR:
 991                 inode->i_op = &orangefs_dir_inode_operations;
 992                 inode->i_fop = &orangefs_dir_operations;
 993                 break;
 994         default:
 995                 gossip_debug(GOSSIP_INODE_DEBUG,
 996                              "%s: unsupported mode\n",
 997                              __func__);
 998                 return -EINVAL;
 999         }
1000
1001         return 0;
1002 }
1003
1004 /*
1005  * Given an ORANGEFS object identifier (fsid, handle), convert it into
1006  * a ino_t type that will be used as a hash-index from where the handle will
1007  * be searched for in the VFS hash table of inodes.
1008  */
1009 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
1010 {
1011         if (!ref)
1012                 return 0;
1013         return orangefs_khandle_to_ino(&(ref->khandle));
1014 }
1015
1016 /*
1017  * Called to set up an inode from iget5_locked.
1018  */
1019 static int orangefs_set_inode(struct inode *inode, void *data)
1020 {
1021         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1022         ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
1023         ORANGEFS_I(inode)->refn.khandle = ref->khandle;
1024         ORANGEFS_I(inode)->attr_valid = 0;
1025         hash_init(ORANGEFS_I(inode)->xattr_cache);
1026         ORANGEFS_I(inode)->mapping_time = jiffies - 1;
1027         ORANGEFS_I(inode)->bitlock = 0;
1028         return 0;
1029 }
1030
1031 /*
1032  * Called to determine if handles match.
1033  */
1034 static int orangefs_test_inode(struct inode *inode, void *data)
1035 {
1036         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1037         struct orangefs_inode_s *orangefs_inode = NULL;
1038
1039         orangefs_inode = ORANGEFS_I(inode);
1040         /* test handles and fs_ids... */
1041         return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
1042                                 &(ref->khandle)) &&
1043                         orangefs_inode->refn.fs_id == ref->fs_id);
1044 }
1045
1046 /*
1047  * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
1048  * file handle.
1049  *
1050  * @sb: the file system super block instance.
1051  * @ref: The ORANGEFS object for which we are trying to locate an inode.
1052  */
1053 struct inode *orangefs_iget(struct super_block *sb,
1054                 struct orangefs_object_kref *ref)
1055 {
1056         struct inode *inode = NULL;
1057         unsigned long hash;
1058         int error;
1059
1060         hash = orangefs_handle_hash(ref);
1061         inode = iget5_locked(sb,
1062                         hash,
1063                         orangefs_test_inode,
1064                         orangefs_set_inode,
1065                         ref);
1066
1067         if (!inode)
1068                 return ERR_PTR(-ENOMEM);
1069
1070         if (!(inode->i_state & I_NEW))
1071                 return inode;
1072
1073         error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1074         if (error) {
1075                 iget_failed(inode);
1076                 return ERR_PTR(error);
1077         }
1078
1079         inode->i_ino = hash;    /* needed for stat etc */
1080         orangefs_init_iops(inode);
1081         unlock_new_inode(inode);
1082
1083         gossip_debug(GOSSIP_INODE_DEBUG,
1084                      "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
1085                      &ref->khandle,
1086                      ref->fs_id,
1087                      hash,
1088                      inode->i_ino);
1089
1090         return inode;
1091 }
1092
1093 /*
1094  * Allocate an inode for a newly created file and insert it into the inode hash.
1095  */
1096 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
1097                 umode_t mode, dev_t dev, struct orangefs_object_kref *ref)
1098 {
1099         struct posix_acl *acl = NULL, *default_acl = NULL;
1100         unsigned long hash = orangefs_handle_hash(ref);
1101         struct inode *inode;
1102         int error;
1103
1104         gossip_debug(GOSSIP_INODE_DEBUG,
1105                      "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
1106                      __func__,
1107                      sb,
1108                      MAJOR(dev),
1109                      MINOR(dev),
1110                      mode);
1111
1112         inode = new_inode(sb);
1113         if (!inode)
1114                 return ERR_PTR(-ENOMEM);
1115
1116         error = posix_acl_create(dir, &mode, &default_acl, &acl);
1117         if (error)
1118                 goto out_iput;
1119
1120         orangefs_set_inode(inode, ref);
1121         inode->i_ino = hash;    /* needed for stat etc */
1122
1123         error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1124         if (error)
1125                 goto out_iput;
1126
1127         orangefs_init_iops(inode);
1128         inode->i_rdev = dev;
1129
1130         if (default_acl) {
1131                 error = __orangefs_set_acl(inode, default_acl,
1132                                            ACL_TYPE_DEFAULT);
1133                 if (error)
1134                         goto out_iput;
1135         }
1136
1137         if (acl) {
1138                 error = __orangefs_set_acl(inode, acl, ACL_TYPE_ACCESS);
1139                 if (error)
1140                         goto out_iput;
1141         }
1142
1143         error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
1144         if (error < 0)
1145                 goto out_iput;
1146
1147         gossip_debug(GOSSIP_INODE_DEBUG,
1148                      "Initializing ACL's for inode %pU\n",
1149                      get_khandle_from_ino(inode));
1150         if (mode != inode->i_mode) {
1151                 struct iattr iattr = {
1152                         .ia_mode = mode,
1153                         .ia_valid = ATTR_MODE,
1154                 };
1155                 inode->i_mode = mode;
1156                 __orangefs_setattr(inode, &iattr);
1157                 __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
1158         }
1159         posix_acl_release(acl);
1160         posix_acl_release(default_acl);
1161         return inode;
1162
1163 out_iput:
1164         iput(inode);
1165         posix_acl_release(acl);
1166         posix_acl_release(default_acl);
1167         return ERR_PTR(error);
1168 }