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 <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_invalidatepage. */
  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, WRITE, &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, WRITE, 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_page(struct page *);
 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, READ, 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_readpage(struct file *file, struct page *page)
 292 {
 293         struct inode *inode = page->mapping->host;
 294         struct iov_iter iter;
 295         struct bio_vec bv;
 296         ssize_t ret;
 297         loff_t off; /* offset into this page */
 298
 299         if (PageDirty(page))
 300                 orangefs_launder_page(page);
 301
 302         off = page_offset(page);
 303         bv.bv_page = page;
 304         bv.bv_len = PAGE_SIZE;
 305         bv.bv_offset = 0;
 306         iov_iter_bvec(&iter, READ, &bv, 1, PAGE_SIZE);
 307
 308         ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, &off, &iter,
 309             PAGE_SIZE, inode->i_size, NULL, NULL, file);
 310         /* this will only zero remaining unread portions of the page data */
 311         iov_iter_zero(~0U, &iter);
 312         /* takes care of potential aliasing */
 313         flush_dcache_page(page);
 314         if (ret < 0) {
 315                 SetPageError(page);
 316         } else {
 317                 SetPageUptodate(page);
 318                 if (PageError(page))
 319                         ClearPageError(page);
 320                 ret = 0;
 321         }
 322         /* unlock the page after the ->readpage() routine completes */
 323         unlock_page(page);
 324         return ret;
 325 }
 326
 327 static int orangefs_write_begin(struct file *file,
 328     struct address_space *mapping,
 329     loff_t pos, unsigned len, unsigned flags, struct page **pagep,
 330     void **fsdata)
 331 {
 332         struct orangefs_write_range *wr;
 333         struct page *page;
 334         pgoff_t index;
 335         int ret;
 336
 337         index = pos >> PAGE_SHIFT;
 338
 339         page = grab_cache_page_write_begin(mapping, index, flags);
 340         if (!page)
 341                 return -ENOMEM;
 342
 343         *pagep = page;
 344
 345         if (PageDirty(page) && !PagePrivate(page)) {
 346                 /*
 347                  * Should be impossible.  If it happens, launder the page
 348                  * since we don't know what's dirty.  This will WARN in
 349                  * orangefs_writepage_locked.
 350                  */
 351                 ret = orangefs_launder_page(page);
 352                 if (ret)
 353                         return ret;
 354         }
 355         if (PagePrivate(page)) {
 356                 struct orangefs_write_range *wr;
 357                 wr = (struct orangefs_write_range *)page_private(page);
 358                 if (wr->pos + wr->len == pos &&
 359                     uid_eq(wr->uid, current_fsuid()) &&
 360                     gid_eq(wr->gid, current_fsgid())) {
 361                         wr->len += len;
 362                         goto okay;
 363                 } else {
 364                         ret = orangefs_launder_page(page);
 365                         if (ret)
 366                                 return ret;
 367                 }
 368         }
 369
 370         wr = kmalloc(sizeof *wr, GFP_KERNEL);
 371         if (!wr)
 372                 return -ENOMEM;
 373
 374         wr->pos = pos;
 375         wr->len = len;
 376         wr->uid = current_fsuid();
 377         wr->gid = current_fsgid();
 378         attach_page_private(page, wr);
 379 okay:
 380         return 0;
 381 }
 382
 383 static int orangefs_write_end(struct file *file, struct address_space *mapping,
 384     loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
 385 {
 386         struct inode *inode = page->mapping->host;
 387         loff_t last_pos = pos + copied;
 388
 389         /*
 390          * No need to use i_size_read() here, the i_size
 391          * cannot change under us because we hold the i_mutex.
 392          */
 393         if (last_pos > inode->i_size)
 394                 i_size_write(inode, last_pos);
 395
 396         /* zero the stale part of the page if we did a short copy */
 397         if (!PageUptodate(page)) {
 398                 unsigned from = pos & (PAGE_SIZE - 1);
 399                 if (copied < len) {
 400                         zero_user(page, from + copied, len - copied);
 401                 }
 402                 /* Set fully written pages uptodate. */
 403                 if (pos == page_offset(page) &&
 404                     (len == PAGE_SIZE || pos + len == inode->i_size)) {
 405                         zero_user_segment(page, from + copied, PAGE_SIZE);
 406                         SetPageUptodate(page);
 407                 }
 408         }
 409
 410         set_page_dirty(page);
 411         unlock_page(page);
 412         put_page(page);
 413
 414         mark_inode_dirty_sync(file_inode(file));
 415         return copied;
 416 }
 417
 418 static void orangefs_invalidatepage(struct page *page,
 419                                  unsigned int offset,
 420                                  unsigned int length)
 421 {
 422         struct orangefs_write_range *wr;
 423         wr = (struct orangefs_write_range *)page_private(page);
 424
 425         if (offset == 0 && length == PAGE_SIZE) {
 426                 kfree(detach_page_private(page));
 427                 return;
 428         /* write range entirely within invalidate range (or equal) */
 429         } else if (page_offset(page) + offset <= wr->pos &&
 430             wr->pos + wr->len <= page_offset(page) + offset + length) {
 431                 kfree(detach_page_private(page));
 432                 /* XXX is this right? only caller in fs */
 433                 cancel_dirty_page(page);
 434                 return;
 435         /* invalidate range chops off end of write range */
 436         } else if (wr->pos < page_offset(page) + offset &&
 437             wr->pos + wr->len <= page_offset(page) + offset + length &&
 438              page_offset(page) + offset < wr->pos + wr->len) {
 439                 size_t x;
 440                 x = wr->pos + wr->len - (page_offset(page) + offset);
 441                 WARN_ON(x > wr->len);
 442                 wr->len -= x;
 443                 wr->uid = current_fsuid();
 444                 wr->gid = current_fsgid();
 445         /* invalidate range chops off beginning of write range */
 446         } else if (page_offset(page) + offset <= wr->pos &&
 447             page_offset(page) + offset + length < wr->pos + wr->len &&
 448             wr->pos < page_offset(page) + offset + length) {
 449                 size_t x;
 450                 x = page_offset(page) + offset + length - wr->pos;
 451                 WARN_ON(x > wr->len);
 452                 wr->pos += x;
 453                 wr->len -= x;
 454                 wr->uid = current_fsuid();
 455                 wr->gid = current_fsgid();
 456         /* invalidate range entirely within write range (punch hole) */
 457         } else if (wr->pos < page_offset(page) + offset &&
 458             page_offset(page) + offset + length < wr->pos + wr->len) {
 459                 /* XXX what do we do here... should not WARN_ON */
 460                 WARN_ON(1);
 461                 /* punch hole */
 462                 /*
 463                  * should we just ignore this and write it out anyway?
 464                  * it hardly makes sense
 465                  */
 466                 return;
 467         /* non-overlapping ranges */
 468         } else {
 469                 /* WARN if they do overlap */
 470                 if (!((page_offset(page) + offset + length <= wr->pos) ^
 471                     (wr->pos + wr->len <= page_offset(page) + offset))) {
 472                         WARN_ON(1);
 473                         printk("invalidate range offset %llu length %u\n",
 474                             page_offset(page) + offset, length);
 475                         printk("write range offset %llu length %zu\n",
 476                             wr->pos, wr->len);
 477                 }
 478                 return;
 479         }
 480
 481         /*
 482          * Above there are returns where wr is freed or where we WARN.
 483          * Thus the following runs if wr was modified above.
 484          */
 485
 486         orangefs_launder_page(page);
 487 }
 488
 489 static int orangefs_releasepage(struct page *page, gfp_t foo)
 490 {
 491         return !PagePrivate(page);
 492 }
 493
 494 static void orangefs_freepage(struct page *page)
 495 {
 496         kfree(detach_page_private(page));
 497 }
 498
 499 static int orangefs_launder_page(struct page *page)
 500 {
 501         int r = 0;
 502         struct writeback_control wbc = {
 503                 .sync_mode = WB_SYNC_ALL,
 504                 .nr_to_write = 0,
 505         };
 506         wait_on_page_writeback(page);
 507         if (clear_page_dirty_for_io(page)) {
 508                 r = orangefs_writepage_locked(page, &wbc);
 509                 end_page_writeback(page);
 510         }
 511         return r;
 512 }
 513
 514 static ssize_t orangefs_direct_IO(struct kiocb *iocb,
 515                                   struct iov_iter *iter)
 516 {
 517         /*
 518          * Comment from original do_readv_writev:
 519          * Common entry point for read/write/readv/writev
 520          * This function will dispatch it to either the direct I/O
 521          * or buffered I/O path depending on the mount options and/or
 522          * augmented/extended metadata attached to the file.
 523          * Note: File extended attributes override any mount options.
 524          */
 525         struct file *file = iocb->ki_filp;
 526         loff_t pos = iocb->ki_pos;
 527         enum ORANGEFS_io_type type = iov_iter_rw(iter) == WRITE ?
 528             ORANGEFS_IO_WRITE : ORANGEFS_IO_READ;
 529         loff_t *offset = &pos;
 530         struct inode *inode = file->f_mapping->host;
 531         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 532         struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
 533         size_t count = iov_iter_count(iter);
 534         ssize_t total_count = 0;
 535         ssize_t ret = -EINVAL;
 536         int i = 0;
 537
 538         gossip_debug(GOSSIP_FILE_DEBUG,
 539                 "%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
 540                 __func__,
 541                 handle,
 542                 (int)count);
 543
 544         if (type == ORANGEFS_IO_WRITE) {
 545                 gossip_debug(GOSSIP_FILE_DEBUG,
 546                              "%s(%pU): proceeding with offset : %llu, "
 547                              "size %d\n",
 548                              __func__,
 549                              handle,
 550                              llu(*offset),
 551                              (int)count);
 552         }
 553
 554         if (count == 0) {
 555                 ret = 0;
 556                 goto out;
 557         }
 558
 559         while (iov_iter_count(iter)) {
 560                 size_t each_count = iov_iter_count(iter);
 561                 size_t amt_complete;
 562                 i++;
 563
 564                 /* how much to transfer in this loop iteration */
 565                 if (each_count > orangefs_bufmap_size_query())
 566                         each_count = orangefs_bufmap_size_query();
 567
 568                 gossip_debug(GOSSIP_FILE_DEBUG,
 569                              "%s(%pU): size of each_count(%d)\n",
 570                              __func__,
 571                              handle,
 572                              (int)each_count);
 573                 gossip_debug(GOSSIP_FILE_DEBUG,
 574                              "%s(%pU): BEFORE wait_for_io: offset is %d\n",
 575                              __func__,
 576                              handle,
 577                              (int)*offset);
 578
 579                 ret = wait_for_direct_io(type, inode, offset, iter,
 580                                 each_count, 0, NULL, NULL, file);
 581                 gossip_debug(GOSSIP_FILE_DEBUG,
 582                              "%s(%pU): return from wait_for_io:%d\n",
 583                              __func__,
 584                              handle,
 585                              (int)ret);
 586
 587                 if (ret < 0)
 588                         goto out;
 589
 590                 *offset += ret;
 591                 total_count += ret;
 592                 amt_complete = ret;
 593
 594                 gossip_debug(GOSSIP_FILE_DEBUG,
 595                              "%s(%pU): AFTER wait_for_io: offset is %d\n",
 596                              __func__,
 597                              handle,
 598                              (int)*offset);
 599
 600                 /*
 601                  * if we got a short I/O operations,
 602                  * fall out and return what we got so far
 603                  */
 604                 if (amt_complete < each_count)
 605                         break;
 606         } /*end while */
 607
 608 out:
 609         if (total_count > 0)
 610                 ret = total_count;
 611         if (ret > 0) {
 612                 if (type == ORANGEFS_IO_READ) {
 613                         file_accessed(file);
 614                 } else {
 615                         file_update_time(file);
 616                         if (*offset > i_size_read(inode))
 617                                 i_size_write(inode, *offset);
 618                 }
 619         }
 620
 621         gossip_debug(GOSSIP_FILE_DEBUG,
 622                      "%s(%pU): Value(%d) returned.\n",
 623                      __func__,
 624                      handle,
 625                      (int)ret);
 626
 627         return ret;
 628 }
 629
 630 /** ORANGEFS2 implementation of address space operations */
 631 static const struct address_space_operations orangefs_address_operations = {
 632         .writepage = orangefs_writepage,
 633         .readahead = orangefs_readahead,
 634         .readpage = orangefs_readpage,
 635         .writepages = orangefs_writepages,
 636         .set_page_dirty = __set_page_dirty_nobuffers,
 637         .write_begin = orangefs_write_begin,
 638         .write_end = orangefs_write_end,
 639         .invalidatepage = orangefs_invalidatepage,
 640         .releasepage = orangefs_releasepage,
 641         .freepage = orangefs_freepage,
 642         .launder_page = orangefs_launder_page,
 643         .direct_IO = orangefs_direct_IO,
 644 };
 645
 646 vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
 647 {
 648         struct page *page = vmf->page;
 649         struct inode *inode = file_inode(vmf->vma->vm_file);
 650         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 651         unsigned long *bitlock = &orangefs_inode->bitlock;
 652         vm_fault_t ret;
 653         struct orangefs_write_range *wr;
 654
 655         sb_start_pagefault(inode->i_sb);
 656
 657         if (wait_on_bit(bitlock, 1, TASK_KILLABLE)) {
 658                 ret = VM_FAULT_RETRY;
 659                 goto out;
 660         }
 661
 662         lock_page(page);
 663         if (PageDirty(page) && !PagePrivate(page)) {
 664                 /*
 665                  * Should be impossible.  If it happens, launder the page
 666                  * since we don't know what's dirty.  This will WARN in
 667                  * orangefs_writepage_locked.
 668                  */
 669                 if (orangefs_launder_page(page)) {
 670                         ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
 671                         goto out;
 672                 }
 673         }
 674         if (PagePrivate(page)) {
 675                 wr = (struct orangefs_write_range *)page_private(page);
 676                 if (uid_eq(wr->uid, current_fsuid()) &&
 677                     gid_eq(wr->gid, current_fsgid())) {
 678                         wr->pos = page_offset(page);
 679                         wr->len = PAGE_SIZE;
 680                         goto okay;
 681                 } else {
 682                         if (orangefs_launder_page(page)) {
 683                                 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
 684                                 goto out;
 685                         }
 686                 }
 687         }
 688         wr = kmalloc(sizeof *wr, GFP_KERNEL);
 689         if (!wr) {
 690                 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
 691                 goto out;
 692         }
 693         wr->pos = page_offset(page);
 694         wr->len = PAGE_SIZE;
 695         wr->uid = current_fsuid();
 696         wr->gid = current_fsgid();
 697         attach_page_private(page, wr);
 698 okay:
 699
 700         file_update_time(vmf->vma->vm_file);
 701         if (page->mapping != inode->i_mapping) {
 702                 unlock_page(page);
 703                 ret = VM_FAULT_LOCKED|VM_FAULT_NOPAGE;
 704                 goto out;
 705         }
 706
 707         /*
 708          * We mark the page dirty already here so that when freeze is in
 709          * progress, we are guaranteed that writeback during freezing will
 710          * see the dirty page and writeprotect it again.
 711          */
 712         set_page_dirty(page);
 713         wait_for_stable_page(page);
 714         ret = VM_FAULT_LOCKED;
 715 out:
 716         sb_end_pagefault(inode->i_sb);
 717         return ret;
 718 }
 719
 720 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
 721 {
 722         struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
 723         struct orangefs_kernel_op_s *new_op;
 724         loff_t orig_size;
 725         int ret = -EINVAL;
 726
 727         gossip_debug(GOSSIP_INODE_DEBUG,
 728                      "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
 729                      __func__,
 730                      get_khandle_from_ino(inode),
 731                      &orangefs_inode->refn.khandle,
 732                      orangefs_inode->refn.fs_id,
 733                      iattr->ia_size);
 734
 735         /* Ensure that we have a up to date size, so we know if it changed. */
 736         ret = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_SIZE);
 737         if (ret == -ESTALE)
 738                 ret = -EIO;
 739         if (ret) {
 740                 gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
 741                     __func__, ret);
 742                 return ret;
 743         }
 744         orig_size = i_size_read(inode);
 745
 746         /* This is truncate_setsize in a different order. */
 747         truncate_pagecache(inode, iattr->ia_size);
 748         i_size_write(inode, iattr->ia_size);
 749         if (iattr->ia_size > orig_size)
 750                 pagecache_isize_extended(inode, orig_size, iattr->ia_size);
 751
 752         new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
 753         if (!new_op)
 754                 return -ENOMEM;
 755
 756         new_op->upcall.req.truncate.refn = orangefs_inode->refn;
 757         new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
 758
 759         ret = service_operation(new_op,
 760                 __func__,
 761                 get_interruptible_flag(inode));
 762
 763         /*
 764          * the truncate has no downcall members to retrieve, but
 765          * the status value tells us if it went through ok or not
 766          */
 767         gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
 768
 769         op_release(new_op);
 770
 771         if (ret != 0)
 772                 return ret;
 773
 774         if (orig_size != i_size_read(inode))
 775                 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
 776
 777         return ret;
 778 }
 779
 780 int __orangefs_setattr(struct inode *inode, struct iattr *iattr)
 781 {
 782         int ret;
 783
 784         if (iattr->ia_valid & ATTR_MODE) {
 785                 if (iattr->ia_mode & (S_ISVTX)) {
 786                         if (is_root_handle(inode)) {
 787                                 /*
 788                                  * allow sticky bit to be set on root (since
 789                                  * it shows up that way by default anyhow),
 790                                  * but don't show it to the server
 791                                  */
 792                                 iattr->ia_mode -= S_ISVTX;
 793                         } else {
 794                                 gossip_debug(GOSSIP_UTILS_DEBUG,
 795                                              "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
 796                                 ret = -EINVAL;
 797                                 goto out;
 798                         }
 799                 }
 800                 if (iattr->ia_mode & (S_ISUID)) {
 801                         gossip_debug(GOSSIP_UTILS_DEBUG,
 802                                      "Attempting to set setuid bit (not supported); returning EINVAL.\n");
 803                         ret = -EINVAL;
 804                         goto out;
 805                 }
 806         }
 807
 808         if (iattr->ia_valid & ATTR_SIZE) {
 809                 ret = orangefs_setattr_size(inode, iattr);
 810                 if (ret)
 811                         goto out;
 812         }
 813
 814 again:
 815         spin_lock(&inode->i_lock);
 816         if (ORANGEFS_I(inode)->attr_valid) {
 817                 if (uid_eq(ORANGEFS_I(inode)->attr_uid, current_fsuid()) &&
 818                     gid_eq(ORANGEFS_I(inode)->attr_gid, current_fsgid())) {
 819                         ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
 820                 } else {
 821                         spin_unlock(&inode->i_lock);
 822                         write_inode_now(inode, 1);
 823                         goto again;
 824                 }
 825         } else {
 826                 ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
 827                 ORANGEFS_I(inode)->attr_uid = current_fsuid();
 828                 ORANGEFS_I(inode)->attr_gid = current_fsgid();
 829         }
 830         setattr_copy(&init_user_ns, inode, iattr);
 831         spin_unlock(&inode->i_lock);
 832         mark_inode_dirty(inode);
 833
 834         if (iattr->ia_valid & ATTR_MODE)
 835                 /* change mod on a file that has ACLs */
 836                 ret = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
 837
 838         ret = 0;
 839 out:
 840         return ret;
 841 }
 842
 843 /*
 844  * Change attributes of an object referenced by dentry.
 845  */
 846 int orangefs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 847                      struct iattr *iattr)
 848 {
 849         int ret;
 850         gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
 851             dentry);
 852         ret = setattr_prepare(&init_user_ns, dentry, iattr);
 853         if (ret)
 854                 goto out;
 855         ret = __orangefs_setattr(d_inode(dentry), iattr);
 856         sync_inode_metadata(d_inode(dentry), 1);
 857 out:
 858         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
 859             ret);
 860         return ret;
 861 }
 862
 863 /*
 864  * Obtain attributes of an object given a dentry
 865  */
 866 int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path,
 867                      struct kstat *stat, u32 request_mask, unsigned int flags)
 868 {
 869         int ret;
 870         struct inode *inode = path->dentry->d_inode;
 871
 872         gossip_debug(GOSSIP_INODE_DEBUG,
 873                      "orangefs_getattr: called on %pd mask %u\n",
 874                      path->dentry, request_mask);
 875
 876         ret = orangefs_inode_getattr(inode,
 877             request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
 878         if (ret == 0) {
 879                 generic_fillattr(&init_user_ns, inode, stat);
 880
 881                 /* override block size reported to stat */
 882                 if (!(request_mask & STATX_SIZE))
 883                         stat->result_mask &= ~STATX_SIZE;
 884
 885                 generic_fill_statx_attr(inode, stat);
 886         }
 887         return ret;
 888 }
 889
 890 int orangefs_permission(struct user_namespace *mnt_userns,
 891                         struct inode *inode, int mask)
 892 {
 893         int ret;
 894
 895         if (mask & MAY_NOT_BLOCK)
 896                 return -ECHILD;
 897
 898         gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
 899
 900         /* Make sure the permission (and other common attrs) are up to date. */
 901         ret = orangefs_inode_getattr(inode, 0);
 902         if (ret < 0)
 903                 return ret;
 904
 905         return generic_permission(&init_user_ns, inode, mask);
 906 }
 907
 908 int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
 909 {
 910         struct iattr iattr;
 911         gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
 912             get_khandle_from_ino(inode));
 913         generic_update_time(inode, time, flags);
 914         memset(&iattr, 0, sizeof iattr);
 915         if (flags & S_ATIME)
 916                 iattr.ia_valid |= ATTR_ATIME;
 917         if (flags & S_CTIME)
 918                 iattr.ia_valid |= ATTR_CTIME;
 919         if (flags & S_MTIME)
 920                 iattr.ia_valid |= ATTR_MTIME;
 921         return __orangefs_setattr(inode, &iattr);
 922 }
 923
 924 static int orangefs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 925 {
 926         u64 val = 0;
 927         int ret;
 928
 929         gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
 930                      dentry);
 931
 932         ret = orangefs_inode_getxattr(d_inode(dentry),
 933                                       "user.pvfs2.meta_hint",
 934                                       &val, sizeof(val));
 935         if (ret < 0 && ret != -ENODATA)
 936                 return ret;
 937
 938         gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
 939
 940         fileattr_fill_flags(fa, val);
 941         return 0;
 942 }
 943
 944 static int orangefs_fileattr_set(struct user_namespace *mnt_userns,
 945                                  struct dentry *dentry, struct fileattr *fa)
 946 {
 947         u64 val = 0;
 948
 949         gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
 950                      dentry);
 951         /*
 952          * ORANGEFS_MIRROR_FL is set internally when the mirroring mode is
 953          * turned on for a file. The user is not allowed to turn on this bit,
 954          * but the bit is present if the user first gets the flags and then
 955          * updates the flags with some new settings. So, we ignore it in the
 956          * following edit. bligon.
 957          */
 958         if (fileattr_has_fsx(fa) ||
 959             (fa->flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NOATIME_FL | ORANGEFS_MIRROR_FL))) {
 960                 gossip_err("%s: only supports setting one of FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NOATIME_FL\n",
 961                            __func__);
 962                 return -EOPNOTSUPP;
 963         }
 964         val = fa->flags;
 965         gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
 966         return orangefs_inode_setxattr(d_inode(dentry),
 967                                        "user.pvfs2.meta_hint",
 968                                        &val, sizeof(val), 0);
 969 }
 970
 971 /* ORANGEFS2 implementation of VFS inode operations for files */
 972 static const struct inode_operations orangefs_file_inode_operations = {
 973         .get_acl = orangefs_get_acl,
 974         .set_acl = orangefs_set_acl,
 975         .setattr = orangefs_setattr,
 976         .getattr = orangefs_getattr,
 977         .listxattr = orangefs_listxattr,
 978         .permission = orangefs_permission,
 979         .update_time = orangefs_update_time,
 980         .fileattr_get = orangefs_fileattr_get,
 981         .fileattr_set = orangefs_fileattr_set,
 982 };
 983
 984 static int orangefs_init_iops(struct inode *inode)
 985 {
 986         inode->i_mapping->a_ops = &orangefs_address_operations;
 987
 988         switch (inode->i_mode & S_IFMT) {
 989         case S_IFREG:
 990                 inode->i_op = &orangefs_file_inode_operations;
 991                 inode->i_fop = &orangefs_file_operations;
 992                 break;
 993         case S_IFLNK:
 994                 inode->i_op = &orangefs_symlink_inode_operations;
 995                 break;
 996         case S_IFDIR:
 997                 inode->i_op = &orangefs_dir_inode_operations;
 998                 inode->i_fop = &orangefs_dir_operations;
 999                 break;
1000         default:
1001                 gossip_debug(GOSSIP_INODE_DEBUG,
1002                              "%s: unsupported mode\n",
1003                              __func__);
1004                 return -EINVAL;
1005         }
1006
1007         return 0;
1008 }
1009
1010 /*
1011  * Given an ORANGEFS object identifier (fsid, handle), convert it into
1012  * a ino_t type that will be used as a hash-index from where the handle will
1013  * be searched for in the VFS hash table of inodes.
1014  */
1015 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
1016 {
1017         if (!ref)
1018                 return 0;
1019         return orangefs_khandle_to_ino(&(ref->khandle));
1020 }
1021
1022 /*
1023  * Called to set up an inode from iget5_locked.
1024  */
1025 static int orangefs_set_inode(struct inode *inode, void *data)
1026 {
1027         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1028         ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
1029         ORANGEFS_I(inode)->refn.khandle = ref->khandle;
1030         ORANGEFS_I(inode)->attr_valid = 0;
1031         hash_init(ORANGEFS_I(inode)->xattr_cache);
1032         ORANGEFS_I(inode)->mapping_time = jiffies - 1;
1033         ORANGEFS_I(inode)->bitlock = 0;
1034         return 0;
1035 }
1036
1037 /*
1038  * Called to determine if handles match.
1039  */
1040 static int orangefs_test_inode(struct inode *inode, void *data)
1041 {
1042         struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1043         struct orangefs_inode_s *orangefs_inode = NULL;
1044
1045         orangefs_inode = ORANGEFS_I(inode);
1046         /* test handles and fs_ids... */
1047         return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
1048                                 &(ref->khandle)) &&
1049                         orangefs_inode->refn.fs_id == ref->fs_id);
1050 }
1051
1052 /*
1053  * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
1054  * file handle.
1055  *
1056  * @sb: the file system super block instance.
1057  * @ref: The ORANGEFS object for which we are trying to locate an inode.
1058  */
1059 struct inode *orangefs_iget(struct super_block *sb,
1060                 struct orangefs_object_kref *ref)
1061 {
1062         struct inode *inode = NULL;
1063         unsigned long hash;
1064         int error;
1065
1066         hash = orangefs_handle_hash(ref);
1067         inode = iget5_locked(sb,
1068                         hash,
1069                         orangefs_test_inode,
1070                         orangefs_set_inode,
1071                         ref);
1072
1073         if (!inode)
1074                 return ERR_PTR(-ENOMEM);
1075
1076         if (!(inode->i_state & I_NEW))
1077                 return inode;
1078
1079         error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1080         if (error) {
1081                 iget_failed(inode);
1082                 return ERR_PTR(error);
1083         }
1084
1085         inode->i_ino = hash;    /* needed for stat etc */
1086         orangefs_init_iops(inode);
1087         unlock_new_inode(inode);
1088
1089         gossip_debug(GOSSIP_INODE_DEBUG,
1090                      "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
1091                      &ref->khandle,
1092                      ref->fs_id,
1093                      hash,
1094                      inode->i_ino);
1095
1096         return inode;
1097 }
1098
1099 /*
1100  * Allocate an inode for a newly created file and insert it into the inode hash.
1101  */
1102 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
1103                 int mode, dev_t dev, struct orangefs_object_kref *ref)
1104 {
1105         unsigned long hash = orangefs_handle_hash(ref);
1106         struct inode *inode;
1107         int error;
1108
1109         gossip_debug(GOSSIP_INODE_DEBUG,
1110                      "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
1111                      __func__,
1112                      sb,
1113                      MAJOR(dev),
1114                      MINOR(dev),
1115                      mode);
1116
1117         inode = new_inode(sb);
1118         if (!inode)
1119                 return ERR_PTR(-ENOMEM);
1120
1121         orangefs_set_inode(inode, ref);
1122         inode->i_ino = hash;    /* needed for stat etc */
1123
1124         error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1125         if (error)
1126                 goto out_iput;
1127
1128         orangefs_init_iops(inode);
1129         inode->i_rdev = dev;
1130
1131         error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
1132         if (error < 0)
1133                 goto out_iput;
1134
1135         gossip_debug(GOSSIP_INODE_DEBUG,
1136                      "Initializing ACL's for inode %pU\n",
1137                      get_khandle_from_ino(inode));
1138         orangefs_init_acl(inode, dir);
1139         return inode;
1140
1141 out_iput:
1142         iput(inode);
1143         return ERR_PTR(error);
1144 }