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