fs/exofs/inode.c

   1 /*
   2  * Copyright (C) 2005, 2006
   3  * Avishay Traeger (avishay@gmail.com)
   4  * Copyright (C) 2008, 2009
   5  * Boaz Harrosh <bharrosh@panasas.com>
   6  *
   7  * Copyrights for code taken from ext2:
   8  *     Copyright (C) 1992, 1993, 1994, 1995
   9  *     Remy Card (card@masi.ibp.fr)
  10  *     Laboratoire MASI - Institut Blaise Pascal
  11  *     Universite Pierre et Marie Curie (Paris VI)
  12  *     from
  13  *     linux/fs/minix/inode.c
  14  *     Copyright (C) 1991, 1992  Linus Torvalds
  15  *
  16  * This file is part of exofs.
  17  *
  18  * exofs is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License as published by
  20  * the Free Software Foundation.  Since it is based on ext2, and the only
  21  * valid version of GPL for the Linux kernel is version 2, the only valid
  22  * version of GPL for exofs is version 2.
  23  *
  24  * exofs is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License
  30  * along with exofs; if not, write to the Free Software
  31  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  32  */
  33
  34 #include <linux/slab.h>
  35
  36 #include "exofs.h"
  37
  38 #define EXOFS_DBGMSG2(M...) do {} while (0)
  39
  40 enum {MAX_PAGES_KMALLOC = PAGE_SIZE / sizeof(struct page *), };
  41
  42 unsigned exofs_max_io_pages(struct ore_layout *layout,
  43                             unsigned expected_pages)
  44 {
  45         unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC);
  46
  47         /* TODO: easily support bio chaining */
  48         pages =  min_t(unsigned, pages, layout->max_io_length / PAGE_SIZE);
  49         return pages;
  50 }
  51
  52 struct page_collect {
  53         struct exofs_sb_info *sbi;
  54         struct inode *inode;
  55         unsigned expected_pages;
  56         struct ore_io_state *ios;
  57
  58         struct page **pages;
  59         unsigned alloc_pages;
  60         unsigned nr_pages;
  61         unsigned long length;
  62         loff_t pg_first; /* keep 64bit also in 32-arches */
  63         bool read_4_write; /* This means two things: that the read is sync
  64                             * And the pages should not be unlocked.
  65                             */
  66 };
  67
  68 static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
  69                        struct inode *inode)
  70 {
  71         struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
  72
  73         pcol->sbi = sbi;
  74         pcol->inode = inode;
  75         pcol->expected_pages = expected_pages;
  76
  77         pcol->ios = NULL;
  78         pcol->pages = NULL;
  79         pcol->alloc_pages = 0;
  80         pcol->nr_pages = 0;
  81         pcol->length = 0;
  82         pcol->pg_first = -1;
  83         pcol->read_4_write = false;
  84 }
  85
  86 static void _pcol_reset(struct page_collect *pcol)
  87 {
  88         pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
  89
  90         pcol->pages = NULL;
  91         pcol->alloc_pages = 0;
  92         pcol->nr_pages = 0;
  93         pcol->length = 0;
  94         pcol->pg_first = -1;
  95         pcol->ios = NULL;
  96
  97         /* this is probably the end of the loop but in writes
  98          * it might not end here. don't be left with nothing
  99          */
 100         if (!pcol->expected_pages)
 101                 pcol->expected_pages = MAX_PAGES_KMALLOC;
 102 }
 103
 104 static int pcol_try_alloc(struct page_collect *pcol)
 105 {
 106         unsigned pages;
 107
 108         /* TODO: easily support bio chaining */
 109         pages =  exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages);
 110
 111         for (; pages; pages >>= 1) {
 112                 pcol->pages = kmalloc(pages * sizeof(struct page *),
 113                                       GFP_KERNEL);
 114                 if (likely(pcol->pages)) {
 115                         pcol->alloc_pages = pages;
 116                         return 0;
 117                 }
 118         }
 119
 120         EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
 121                   pcol->expected_pages);
 122         return -ENOMEM;
 123 }
 124
 125 static void pcol_free(struct page_collect *pcol)
 126 {
 127         kfree(pcol->pages);
 128         pcol->pages = NULL;
 129
 130         if (pcol->ios) {
 131                 ore_put_io_state(pcol->ios);
 132                 pcol->ios = NULL;
 133         }
 134 }
 135
 136 static int pcol_add_page(struct page_collect *pcol, struct page *page,
 137                          unsigned len)
 138 {
 139         if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
 140                 return -ENOMEM;
 141
 142         pcol->pages[pcol->nr_pages++] = page;
 143         pcol->length += len;
 144         return 0;
 145 }
 146
 147 enum {PAGE_WAS_NOT_IN_IO = 17};
 148 static int update_read_page(struct page *page, int ret)
 149 {
 150         switch (ret) {
 151         case 0:
 152                 /* Everything is OK */
 153                 SetPageUptodate(page);
 154                 if (PageError(page))
 155                         ClearPageError(page);
 156                 break;
 157         case -EFAULT:
 158                 /* In this case we were trying to read something that wasn't on
 159                  * disk yet - return a page full of zeroes.  This should be OK,
 160                  * because the object should be empty (if there was a write
 161                  * before this read, the read would be waiting with the page
 162                  * locked */
 163                 clear_highpage(page);
 164
 165                 SetPageUptodate(page);
 166                 if (PageError(page))
 167                         ClearPageError(page);
 168                 EXOFS_DBGMSG("recovered read error\n");
 169                 /* fall through */
 170         case PAGE_WAS_NOT_IN_IO:
 171                 ret = 0; /* recovered error */
 172                 break;
 173         default:
 174                 SetPageError(page);
 175         }
 176         return ret;
 177 }
 178
 179 static void update_write_page(struct page *page, int ret)
 180 {
 181         if (unlikely(ret == PAGE_WAS_NOT_IN_IO))
 182                 return; /* don't pass start don't collect $200 */
 183
 184         if (ret) {
 185                 mapping_set_error(page->mapping, ret);
 186                 SetPageError(page);
 187         }
 188         end_page_writeback(page);
 189 }
 190
 191 /* Called at the end of reads, to optionally unlock pages and update their
 192  * status.
 193  */
 194 static int __readpages_done(struct page_collect *pcol)
 195 {
 196         int i;
 197         u64 resid;
 198         u64 good_bytes;
 199         u64 length = 0;
 200         int ret = ore_check_io(pcol->ios, &resid);
 201
 202         if (likely(!ret)) {
 203                 good_bytes = pcol->length;
 204                 ret = PAGE_WAS_NOT_IN_IO;
 205         } else {
 206                 good_bytes = pcol->length - resid;
 207         }
 208         if (good_bytes > pcol->ios->length)
 209                 good_bytes = pcol->ios->length;
 210
 211         EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
 212                      " length=0x%lx nr_pages=%u\n",
 213                      pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
 214                      pcol->nr_pages);
 215
 216         for (i = 0; i < pcol->nr_pages; i++) {
 217                 struct page *page = pcol->pages[i];
 218                 struct inode *inode = page->mapping->host;
 219                 int page_stat;
 220
 221                 if (inode != pcol->inode)
 222                         continue; /* osd might add more pages at end */
 223
 224                 if (likely(length < good_bytes))
 225                         page_stat = 0;
 226                 else
 227                         page_stat = ret;
 228
 229                 EXOFS_DBGMSG2("    readpages_done(0x%lx, 0x%lx) %s\n",
 230                           inode->i_ino, page->index,
 231                           page_stat ? "bad_bytes" : "good_bytes");
 232
 233                 ret = update_read_page(page, page_stat);
 234                 if (!pcol->read_4_write)
 235                         unlock_page(page);
 236                 length += PAGE_SIZE;
 237         }
 238
 239         pcol_free(pcol);
 240         EXOFS_DBGMSG2("readpages_done END\n");
 241         return ret;
 242 }
 243
 244 /* callback of async reads */
 245 static void readpages_done(struct ore_io_state *ios, void *p)
 246 {
 247         struct page_collect *pcol = p;
 248
 249         __readpages_done(pcol);
 250         atomic_dec(&pcol->sbi->s_curr_pending);
 251         kfree(pcol);
 252 }
 253
 254 static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
 255 {
 256         int i;
 257
 258         for (i = 0; i < pcol->nr_pages; i++) {
 259                 struct page *page = pcol->pages[i];
 260
 261                 if (rw == READ)
 262                         update_read_page(page, ret);
 263                 else
 264                         update_write_page(page, ret);
 265
 266                 unlock_page(page);
 267         }
 268 }
 269
 270 static int _maybe_not_all_in_one_io(struct ore_io_state *ios,
 271         struct page_collect *pcol_src, struct page_collect *pcol)
 272 {
 273         /* length was wrong or offset was not page aligned */
 274         BUG_ON(pcol_src->nr_pages < ios->nr_pages);
 275
 276         if (pcol_src->nr_pages > ios->nr_pages) {
 277                 struct page **src_page;
 278                 unsigned pages_less = pcol_src->nr_pages - ios->nr_pages;
 279                 unsigned long len_less = pcol_src->length - ios->length;
 280                 unsigned i;
 281                 int ret;
 282
 283                 /* This IO was trimmed */
 284                 pcol_src->nr_pages = ios->nr_pages;
 285                 pcol_src->length = ios->length;
 286
 287                 /* Left over pages are passed to the next io */
 288                 pcol->expected_pages += pages_less;
 289                 pcol->nr_pages = pages_less;
 290                 pcol->length = len_less;
 291                 src_page = pcol_src->pages + pcol_src->nr_pages;
 292                 pcol->pg_first = (*src_page)->index;
 293
 294                 ret = pcol_try_alloc(pcol);
 295                 if (unlikely(ret))
 296                         return ret;
 297
 298                 for (i = 0; i < pages_less; ++i)
 299                         pcol->pages[i] = *src_page++;
 300
 301                 EXOFS_DBGMSG("Length was adjusted nr_pages=0x%x "
 302                         "pages_less=0x%x expected_pages=0x%x "
 303                         "next_offset=0x%llx next_len=0x%lx\n",
 304                         pcol_src->nr_pages, pages_less, pcol->expected_pages,
 305                         pcol->pg_first * PAGE_SIZE, pcol->length);
 306         }
 307         return 0;
 308 }
 309
 310 static int read_exec(struct page_collect *pcol)
 311 {
 312         struct exofs_i_info *oi = exofs_i(pcol->inode);
 313         struct ore_io_state *ios;
 314         struct page_collect *pcol_copy = NULL;
 315         int ret;
 316
 317         if (!pcol->pages)
 318                 return 0;
 319
 320         if (!pcol->ios) {
 321                 int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true,
 322                                              pcol->pg_first << PAGE_CACHE_SHIFT,
 323                                              pcol->length, &pcol->ios);
 324
 325                 if (ret)
 326                         return ret;
 327         }
 328
 329         ios = pcol->ios;
 330         ios->pages = pcol->pages;
 331
 332         if (pcol->read_4_write) {
 333                 ore_read(pcol->ios);
 334                 return __readpages_done(pcol);
 335         }
 336
 337         pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
 338         if (!pcol_copy) {
 339                 ret = -ENOMEM;
 340                 goto err;
 341         }
 342
 343         *pcol_copy = *pcol;
 344         ios->done = readpages_done;
 345         ios->private = pcol_copy;
 346
 347         /* pages ownership was passed to pcol_copy */
 348         _pcol_reset(pcol);
 349
 350         ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
 351         if (unlikely(ret))
 352                 goto err;
 353
 354         EXOFS_DBGMSG2("read_exec(0x%lx) offset=0x%llx length=0x%llx\n",
 355                 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
 356
 357         ret = ore_read(ios);
 358         if (unlikely(ret))
 359                 goto err;
 360
 361         atomic_inc(&pcol->sbi->s_curr_pending);
 362
 363         return 0;
 364
 365 err:
 366         if (!pcol->read_4_write)
 367                 _unlock_pcol_pages(pcol, ret, READ);
 368
 369         pcol_free(pcol);
 370
 371         kfree(pcol_copy);
 372         return ret;
 373 }
 374
 375 /* readpage_strip is called either directly from readpage() or by the VFS from
 376  * within read_cache_pages(), to add one more page to be read. It will try to
 377  * collect as many contiguous pages as posible. If a discontinuity is
 378  * encountered, or it runs out of resources, it will submit the previous segment
 379  * and will start a new collection. Eventually caller must submit the last
 380  * segment if present.
 381  */
 382 static int readpage_strip(void *data, struct page *page)
 383 {
 384         struct page_collect *pcol = data;
 385         struct inode *inode = pcol->inode;
 386         struct exofs_i_info *oi = exofs_i(inode);
 387         loff_t i_size = i_size_read(inode);
 388         pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 389         size_t len;
 390         int ret;
 391
 392         /* FIXME: Just for debugging, will be removed */
 393         if (PageUptodate(page))
 394                 EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
 395                           page->index);
 396
 397         if (page->index < end_index)
 398                 len = PAGE_CACHE_SIZE;
 399         else if (page->index == end_index)
 400                 len = i_size & ~PAGE_CACHE_MASK;
 401         else
 402                 len = 0;
 403
 404         if (!len || !obj_created(oi)) {
 405                 /* this will be out of bounds, or doesn't exist yet.
 406                  * Current page is cleared and the request is split
 407                  */
 408                 clear_highpage(page);
 409
 410                 SetPageUptodate(page);
 411                 if (PageError(page))
 412                         ClearPageError(page);
 413
 414                 if (!pcol->read_4_write)
 415                         unlock_page(page);
 416                 EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx "
 417                              "read_4_write=%d index=0x%lx end_index=0x%lx "
 418                              "splitting\n", inode->i_ino, len,
 419                              pcol->read_4_write, page->index, end_index);
 420
 421                 return read_exec(pcol);
 422         }
 423
 424 try_again:
 425
 426         if (unlikely(pcol->pg_first == -1)) {
 427                 pcol->pg_first = page->index;
 428         } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
 429                    page->index)) {
 430                 /* Discontinuity detected, split the request */
 431                 ret = read_exec(pcol);
 432                 if (unlikely(ret))
 433                         goto fail;
 434                 goto try_again;
 435         }
 436
 437         if (!pcol->pages) {
 438                 ret = pcol_try_alloc(pcol);
 439                 if (unlikely(ret))
 440                         goto fail;
 441         }
 442
 443         if (len != PAGE_CACHE_SIZE)
 444                 zero_user(page, len, PAGE_CACHE_SIZE - len);
 445
 446         EXOFS_DBGMSG2("    readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
 447                      inode->i_ino, page->index, len);
 448
 449         ret = pcol_add_page(pcol, page, len);
 450         if (ret) {
 451                 EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
 452                           "this_len=0x%zx nr_pages=%u length=0x%lx\n",
 453                           page, len, pcol->nr_pages, pcol->length);
 454
 455                 /* split the request, and start again with current page */
 456                 ret = read_exec(pcol);
 457                 if (unlikely(ret))
 458                         goto fail;
 459
 460                 goto try_again;
 461         }
 462
 463         return 0;
 464
 465 fail:
 466         /* SetPageError(page); ??? */
 467         unlock_page(page);
 468         return ret;
 469 }
 470
 471 static int exofs_readpages(struct file *file, struct address_space *mapping,
 472                            struct list_head *pages, unsigned nr_pages)
 473 {
 474         struct page_collect pcol;
 475         int ret;
 476
 477         _pcol_init(&pcol, nr_pages, mapping->host);
 478
 479         ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
 480         if (ret) {
 481                 EXOFS_ERR("read_cache_pages => %d\n", ret);
 482                 return ret;
 483         }
 484
 485         ret = read_exec(&pcol);
 486         if (unlikely(ret))
 487                 return ret;
 488
 489         return read_exec(&pcol);
 490 }
 491
 492 static int _readpage(struct page *page, bool read_4_write)
 493 {
 494         struct page_collect pcol;
 495         int ret;
 496
 497         _pcol_init(&pcol, 1, page->mapping->host);
 498
 499         pcol.read_4_write = read_4_write;
 500         ret = readpage_strip(&pcol, page);
 501         if (ret) {
 502                 EXOFS_ERR("_readpage => %d\n", ret);
 503                 return ret;
 504         }
 505
 506         return read_exec(&pcol);
 507 }
 508
 509 /*
 510  * We don't need the file
 511  */
 512 static int exofs_readpage(struct file *file, struct page *page)
 513 {
 514         return _readpage(page, false);
 515 }
 516
 517 /* Callback for osd_write. All writes are asynchronous */
 518 static void writepages_done(struct ore_io_state *ios, void *p)
 519 {
 520         struct page_collect *pcol = p;
 521         int i;
 522         u64 resid;
 523         u64  good_bytes;
 524         u64  length = 0;
 525         int ret = ore_check_io(ios, &resid);
 526
 527         atomic_dec(&pcol->sbi->s_curr_pending);
 528
 529         if (likely(!ret)) {
 530                 good_bytes = pcol->length;
 531                 ret = PAGE_WAS_NOT_IN_IO;
 532         } else {
 533                 good_bytes = pcol->length - resid;
 534         }
 535         if (good_bytes > pcol->ios->length)
 536                 good_bytes = pcol->ios->length;
 537
 538         EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
 539                      " length=0x%lx nr_pages=%u\n",
 540                      pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
 541                      pcol->nr_pages);
 542
 543         for (i = 0; i < pcol->nr_pages; i++) {
 544                 struct page *page = pcol->pages[i];
 545                 struct inode *inode = page->mapping->host;
 546                 int page_stat;
 547
 548                 if (inode != pcol->inode)
 549                         continue; /* osd might add more pages to a bio */
 550
 551                 if (likely(length < good_bytes))
 552                         page_stat = 0;
 553                 else
 554                         page_stat = ret;
 555
 556                 update_write_page(page, page_stat);
 557                 unlock_page(page);
 558                 EXOFS_DBGMSG2("    writepages_done(0x%lx, 0x%lx) status=%d\n",
 559                              inode->i_ino, page->index, page_stat);
 560
 561                 length += PAGE_SIZE;
 562         }
 563
 564         pcol_free(pcol);
 565         kfree(pcol);
 566         EXOFS_DBGMSG2("writepages_done END\n");
 567 }
 568
 569 static int write_exec(struct page_collect *pcol)
 570 {
 571         struct exofs_i_info *oi = exofs_i(pcol->inode);
 572         struct ore_io_state *ios;
 573         struct page_collect *pcol_copy = NULL;
 574         int ret;
 575
 576         if (!pcol->pages)
 577                 return 0;
 578
 579         BUG_ON(pcol->ios);
 580         ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false,
 581                                  pcol->pg_first << PAGE_CACHE_SHIFT,
 582                                  pcol->length, &pcol->ios);
 583         if (unlikely(ret))
 584                 goto err;
 585
 586         pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
 587         if (!pcol_copy) {
 588                 EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
 589                 ret = -ENOMEM;
 590                 goto err;
 591         }
 592
 593         *pcol_copy = *pcol;
 594
 595         ios = pcol->ios;
 596         ios->pages = pcol_copy->pages;
 597         ios->done = writepages_done;
 598         ios->private = pcol_copy;
 599
 600         /* pages ownership was passed to pcol_copy */
 601         _pcol_reset(pcol);
 602
 603         ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
 604         if (unlikely(ret))
 605                 goto err;
 606
 607         EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n",
 608                 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
 609
 610         ret = ore_write(ios);
 611         if (unlikely(ret)) {
 612                 EXOFS_ERR("write_exec: ore_write() Failed\n");
 613                 goto err;
 614         }
 615
 616         atomic_inc(&pcol->sbi->s_curr_pending);
 617         return 0;
 618
 619 err:
 620         _unlock_pcol_pages(pcol, ret, WRITE);
 621         pcol_free(pcol);
 622         kfree(pcol_copy);
 623
 624         return ret;
 625 }
 626
 627 /* writepage_strip is called either directly from writepage() or by the VFS from
 628  * within write_cache_pages(), to add one more page to be written to storage.
 629  * It will try to collect as many contiguous pages as possible. If a
 630  * discontinuity is encountered or it runs out of resources it will submit the
 631  * previous segment and will start a new collection.
 632  * Eventually caller must submit the last segment if present.
 633  */
 634 static int writepage_strip(struct page *page,
 635                            struct writeback_control *wbc_unused, void *data)
 636 {
 637         struct page_collect *pcol = data;
 638         struct inode *inode = pcol->inode;
 639         struct exofs_i_info *oi = exofs_i(inode);
 640         loff_t i_size = i_size_read(inode);
 641         pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 642         size_t len;
 643         int ret;
 644
 645         BUG_ON(!PageLocked(page));
 646
 647         ret = wait_obj_created(oi);
 648         if (unlikely(ret))
 649                 goto fail;
 650
 651         if (page->index < end_index)
 652                 /* in this case, the page is within the limits of the file */
 653                 len = PAGE_CACHE_SIZE;
 654         else {
 655                 len = i_size & ~PAGE_CACHE_MASK;
 656
 657                 if (page->index > end_index || !len) {
 658                         /* in this case, the page is outside the limits
 659                          * (truncate in progress)
 660                          */
 661                         ret = write_exec(pcol);
 662                         if (unlikely(ret))
 663                                 goto fail;
 664                         if (PageError(page))
 665                                 ClearPageError(page);
 666                         unlock_page(page);
 667                         EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
 668                                      "outside the limits\n",
 669                                      inode->i_ino, page->index);
 670                         return 0;
 671                 }
 672         }
 673
 674 try_again:
 675
 676         if (unlikely(pcol->pg_first == -1)) {
 677                 pcol->pg_first = page->index;
 678         } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
 679                    page->index)) {
 680                 /* Discontinuity detected, split the request */
 681                 ret = write_exec(pcol);
 682                 if (unlikely(ret))
 683                         goto fail;
 684
 685                 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
 686                              inode->i_ino, page->index);
 687                 goto try_again;
 688         }
 689
 690         if (!pcol->pages) {
 691                 ret = pcol_try_alloc(pcol);
 692                 if (unlikely(ret))
 693                         goto fail;
 694         }
 695
 696         EXOFS_DBGMSG2("    writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
 697                      inode->i_ino, page->index, len);
 698
 699         ret = pcol_add_page(pcol, page, len);
 700         if (unlikely(ret)) {
 701                 EXOFS_DBGMSG2("Failed pcol_add_page "
 702                              "nr_pages=%u total_length=0x%lx\n",
 703                              pcol->nr_pages, pcol->length);
 704
 705                 /* split the request, next loop will start again */
 706                 ret = write_exec(pcol);
 707                 if (unlikely(ret)) {
 708                         EXOFS_DBGMSG("write_exec failed => %d", ret);
 709                         goto fail;
 710                 }
 711
 712                 goto try_again;
 713         }
 714
 715         BUG_ON(PageWriteback(page));
 716         set_page_writeback(page);
 717
 718         return 0;
 719
 720 fail:
 721         EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
 722                      inode->i_ino, page->index, ret);
 723         set_bit(AS_EIO, &page->mapping->flags);
 724         unlock_page(page);
 725         return ret;
 726 }
 727
 728 static int exofs_writepages(struct address_space *mapping,
 729                        struct writeback_control *wbc)
 730 {
 731         struct page_collect pcol;
 732         long start, end, expected_pages;
 733         int ret;
 734
 735         start = wbc->range_start >> PAGE_CACHE_SHIFT;
 736         end = (wbc->range_end == LLONG_MAX) ?
 737                         start + mapping->nrpages :
 738                         wbc->range_end >> PAGE_CACHE_SHIFT;
 739
 740         if (start || end)
 741                 expected_pages = end - start + 1;
 742         else
 743                 expected_pages = mapping->nrpages;
 744
 745         if (expected_pages < 32L)
 746                 expected_pages = 32L;
 747
 748         EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
 749                      "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
 750                      mapping->host->i_ino, wbc->range_start, wbc->range_end,
 751                      mapping->nrpages, start, end, expected_pages);
 752
 753         _pcol_init(&pcol, expected_pages, mapping->host);
 754
 755         ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
 756         if (unlikely(ret)) {
 757                 EXOFS_ERR("write_cache_pages => %d\n", ret);
 758                 return ret;
 759         }
 760
 761         ret = write_exec(&pcol);
 762         if (unlikely(ret))
 763                 return ret;
 764
 765         if (wbc->sync_mode == WB_SYNC_ALL) {
 766                 return write_exec(&pcol); /* pump the last reminder */
 767         } else if (pcol.nr_pages) {
 768                 /* not SYNC let the reminder join the next writeout */
 769                 unsigned i;
 770
 771                 for (i = 0; i < pcol.nr_pages; i++) {
 772                         struct page *page = pcol.pages[i];
 773
 774                         end_page_writeback(page);
 775                         set_page_dirty(page);
 776                         unlock_page(page);
 777                 }
 778         }
 779         return 0;
 780 }
 781
 782 static int exofs_writepage(struct page *page, struct writeback_control *wbc)
 783 {
 784         struct page_collect pcol;
 785         int ret;
 786
 787         _pcol_init(&pcol, 1, page->mapping->host);
 788
 789         ret = writepage_strip(page, NULL, &pcol);
 790         if (ret) {
 791                 EXOFS_ERR("exofs_writepage => %d\n", ret);
 792                 return ret;
 793         }
 794
 795         return write_exec(&pcol);
 796 }
 797
 798 /* i_mutex held using inode->i_size directly */
 799 static void _write_failed(struct inode *inode, loff_t to)
 800 {
 801         if (to > inode->i_size)
 802                 truncate_pagecache(inode, to, inode->i_size);
 803 }
 804
 805 int exofs_write_begin(struct file *file, struct address_space *mapping,
 806                 loff_t pos, unsigned len, unsigned flags,
 807                 struct page **pagep, void **fsdata)
 808 {
 809         int ret = 0;
 810         struct page *page;
 811
 812         page = *pagep;
 813         if (page == NULL) {
 814                 ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
 815                                          fsdata);
 816                 if (ret) {
 817                         EXOFS_DBGMSG("simple_write_begin failed\n");
 818                         goto out;
 819                 }
 820
 821                 page = *pagep;
 822         }
 823
 824          /* read modify write */
 825         if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
 826                 loff_t i_size = i_size_read(mapping->host);
 827                 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 828                 size_t rlen;
 829
 830                 if (page->index < end_index)
 831                         rlen = PAGE_CACHE_SIZE;
 832                 else if (page->index == end_index)
 833                         rlen = i_size & ~PAGE_CACHE_MASK;
 834                 else
 835                         rlen = 0;
 836
 837                 if (!rlen) {
 838                         clear_highpage(page);
 839                         SetPageUptodate(page);
 840                         goto out;
 841                 }
 842
 843                 ret = _readpage(page, true);
 844                 if (ret) {
 845                         /*SetPageError was done by _readpage. Is it ok?*/
 846                         unlock_page(page);
 847                         EXOFS_DBGMSG("__readpage failed\n");
 848                 }
 849         }
 850 out:
 851         if (unlikely(ret))
 852                 _write_failed(mapping->host, pos + len);
 853
 854         return ret;
 855 }
 856
 857 static int exofs_write_begin_export(struct file *file,
 858                 struct address_space *mapping,
 859                 loff_t pos, unsigned len, unsigned flags,
 860                 struct page **pagep, void **fsdata)
 861 {
 862         *pagep = NULL;
 863
 864         return exofs_write_begin(file, mapping, pos, len, flags, pagep,
 865                                         fsdata);
 866 }
 867
 868 static int exofs_write_end(struct file *file, struct address_space *mapping,
 869                         loff_t pos, unsigned len, unsigned copied,
 870                         struct page *page, void *fsdata)
 871 {
 872         struct inode *inode = mapping->host;
 873         /* According to comment in simple_write_end i_mutex is held */
 874         loff_t i_size = inode->i_size;
 875         int ret;
 876
 877         ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
 878         if (unlikely(ret))
 879                 _write_failed(inode, pos + len);
 880
 881         /* TODO: once simple_write_end marks inode dirty remove */
 882         if (i_size != inode->i_size)
 883                 mark_inode_dirty(inode);
 884         return ret;
 885 }
 886
 887 static int exofs_releasepage(struct page *page, gfp_t gfp)
 888 {
 889         EXOFS_DBGMSG("page 0x%lx\n", page->index);
 890         WARN_ON(1);
 891         return 0;
 892 }
 893
 894 static void exofs_invalidatepage(struct page *page, unsigned long offset)
 895 {
 896         EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset);
 897         WARN_ON(1);
 898 }
 899
 900 const struct address_space_operations exofs_aops = {
 901         .readpage       = exofs_readpage,
 902         .readpages      = exofs_readpages,
 903         .writepage      = exofs_writepage,
 904         .writepages     = exofs_writepages,
 905         .write_begin    = exofs_write_begin_export,
 906         .write_end      = exofs_write_end,
 907         .releasepage    = exofs_releasepage,
 908         .set_page_dirty = __set_page_dirty_nobuffers,
 909         .invalidatepage = exofs_invalidatepage,
 910
 911         /* Not implemented Yet */
 912         .bmap           = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
 913         .direct_IO      = NULL, /* TODO: Should be trivial to do */
 914
 915         /* With these NULL has special meaning or default is not exported */
 916         .get_xip_mem    = NULL,
 917         .migratepage    = NULL,
 918         .launder_page   = NULL,
 919         .is_partially_uptodate = NULL,
 920         .error_remove_page = NULL,
 921 };
 922
 923 /******************************************************************************
 924  * INODE OPERATIONS
 925  *****************************************************************************/
 926
 927 /*
 928  * Test whether an inode is a fast symlink.
 929  */
 930 static inline int exofs_inode_is_fast_symlink(struct inode *inode)
 931 {
 932         struct exofs_i_info *oi = exofs_i(inode);
 933
 934         return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
 935 }
 936
 937 static int _do_truncate(struct inode *inode, loff_t newsize)
 938 {
 939         struct exofs_i_info *oi = exofs_i(inode);
 940         struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
 941         int ret;
 942
 943         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 944
 945         ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize);
 946         if (likely(!ret))
 947                 truncate_setsize(inode, newsize);
 948
 949         EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n",
 950                      inode->i_ino, newsize, ret);
 951         return ret;
 952 }
 953
 954 /*
 955  * Set inode attributes - update size attribute on OSD if needed,
 956  *                        otherwise just call generic functions.
 957  */
 958 int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
 959 {
 960         struct inode *inode = dentry->d_inode;
 961         int error;
 962
 963         /* if we are about to modify an object, and it hasn't been
 964          * created yet, wait
 965          */
 966         error = wait_obj_created(exofs_i(inode));
 967         if (unlikely(error))
 968                 return error;
 969
 970         error = inode_change_ok(inode, iattr);
 971         if (unlikely(error))
 972                 return error;
 973
 974         if ((iattr->ia_valid & ATTR_SIZE) &&
 975             iattr->ia_size != i_size_read(inode)) {
 976                 error = _do_truncate(inode, iattr->ia_size);
 977                 if (unlikely(error))
 978                         return error;
 979         }
 980
 981         setattr_copy(inode, iattr);
 982         mark_inode_dirty(inode);
 983         return 0;
 984 }
 985
 986 static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
 987         EXOFS_APAGE_FS_DATA,
 988         EXOFS_ATTR_INODE_FILE_LAYOUT,
 989         0);
 990 static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
 991         EXOFS_APAGE_FS_DATA,
 992         EXOFS_ATTR_INODE_DIR_LAYOUT,
 993         0);
 994
 995 /*
 996  * Read the Linux inode info from the OSD, and return it as is. In exofs the
 997  * inode info is in an application specific page/attribute of the osd-object.
 998  */
 999 static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
1000                     struct exofs_fcb *inode)
1001 {
1002         struct exofs_sb_info *sbi = sb->s_fs_info;
1003         struct osd_attr attrs[] = {
1004                 [0] = g_attr_inode_data,
1005                 [1] = g_attr_inode_file_layout,
1006                 [2] = g_attr_inode_dir_layout,
1007         };
1008         struct ore_io_state *ios;
1009         struct exofs_on_disk_inode_layout *layout;
1010         int ret;
1011
1012         ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1013         if (unlikely(ret)) {
1014                 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1015                 return ret;
1016         }
1017
1018         attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1019         attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1020
1021         ios->in_attr = attrs;
1022         ios->in_attr_len = ARRAY_SIZE(attrs);
1023
1024         ret = ore_read(ios);
1025         if (unlikely(ret)) {
1026                 EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
1027                           _LLU(oi->one_comp.obj.id), ret);
1028                 memset(inode, 0, sizeof(*inode));
1029                 inode->i_mode = 0040000 | (0777 & ~022);
1030                 /* If object is lost on target we might as well enable it's
1031                  * delete.
1032                  */
1033                 if ((ret == -ENOENT) || (ret == -EINVAL))
1034                         ret = 0;
1035                 goto out;
1036         }
1037
1038         ret = extract_attr_from_ios(ios, &attrs[0]);
1039         if (ret) {
1040                 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1041                 goto out;
1042         }
1043         WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
1044         memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
1045
1046         ret = extract_attr_from_ios(ios, &attrs[1]);
1047         if (ret) {
1048                 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1049                 goto out;
1050         }
1051         if (attrs[1].len) {
1052                 layout = attrs[1].val_ptr;
1053                 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1054                         EXOFS_ERR("%s: unsupported files layout %d\n",
1055                                 __func__, layout->gen_func);
1056                         ret = -ENOTSUPP;
1057                         goto out;
1058                 }
1059         }
1060
1061         ret = extract_attr_from_ios(ios, &attrs[2]);
1062         if (ret) {
1063                 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1064                 goto out;
1065         }
1066         if (attrs[2].len) {
1067                 layout = attrs[2].val_ptr;
1068                 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1069                         EXOFS_ERR("%s: unsupported meta-data layout %d\n",
1070                                 __func__, layout->gen_func);
1071                         ret = -ENOTSUPP;
1072                         goto out;
1073                 }
1074         }
1075
1076 out:
1077         ore_put_io_state(ios);
1078         return ret;
1079 }
1080
1081 static void __oi_init(struct exofs_i_info *oi)
1082 {
1083         init_waitqueue_head(&oi->i_wq);
1084         oi->i_flags = 0;
1085 }
1086 /*
1087  * Fill in an inode read from the OSD and set it up for use
1088  */
1089 struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
1090 {
1091         struct exofs_i_info *oi;
1092         struct exofs_fcb fcb;
1093         struct inode *inode;
1094         int ret;
1095
1096         inode = iget_locked(sb, ino);
1097         if (!inode)
1098                 return ERR_PTR(-ENOMEM);
1099         if (!(inode->i_state & I_NEW))
1100                 return inode;
1101         oi = exofs_i(inode);
1102         __oi_init(oi);
1103         exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1104                          exofs_oi_objno(oi));
1105
1106         /* read the inode from the osd */
1107         ret = exofs_get_inode(sb, oi, &fcb);
1108         if (ret)
1109                 goto bad_inode;
1110
1111         set_obj_created(oi);
1112
1113         /* copy stuff from on-disk struct to in-memory struct */
1114         inode->i_mode = le16_to_cpu(fcb.i_mode);
1115         inode->i_uid = le32_to_cpu(fcb.i_uid);
1116         inode->i_gid = le32_to_cpu(fcb.i_gid);
1117         inode->i_nlink = le16_to_cpu(fcb.i_links_count);
1118         inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
1119         inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
1120         inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
1121         inode->i_ctime.tv_nsec =
1122                 inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
1123         oi->i_commit_size = le64_to_cpu(fcb.i_size);
1124         i_size_write(inode, oi->i_commit_size);
1125         inode->i_blkbits = EXOFS_BLKSHIFT;
1126         inode->i_generation = le32_to_cpu(fcb.i_generation);
1127
1128         oi->i_dir_start_lookup = 0;
1129
1130         if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
1131                 ret = -ESTALE;
1132                 goto bad_inode;
1133         }
1134
1135         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1136                 if (fcb.i_data[0])
1137                         inode->i_rdev =
1138                                 old_decode_dev(le32_to_cpu(fcb.i_data[0]));
1139                 else
1140                         inode->i_rdev =
1141                                 new_decode_dev(le32_to_cpu(fcb.i_data[1]));
1142         } else {
1143                 memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
1144         }
1145
1146         inode->i_mapping->backing_dev_info = sb->s_bdi;
1147         if (S_ISREG(inode->i_mode)) {
1148                 inode->i_op = &exofs_file_inode_operations;
1149                 inode->i_fop = &exofs_file_operations;
1150                 inode->i_mapping->a_ops = &exofs_aops;
1151         } else if (S_ISDIR(inode->i_mode)) {
1152                 inode->i_op = &exofs_dir_inode_operations;
1153                 inode->i_fop = &exofs_dir_operations;
1154                 inode->i_mapping->a_ops = &exofs_aops;
1155         } else if (S_ISLNK(inode->i_mode)) {
1156                 if (exofs_inode_is_fast_symlink(inode))
1157                         inode->i_op = &exofs_fast_symlink_inode_operations;
1158                 else {
1159                         inode->i_op = &exofs_symlink_inode_operations;
1160                         inode->i_mapping->a_ops = &exofs_aops;
1161                 }
1162         } else {
1163                 inode->i_op = &exofs_special_inode_operations;
1164                 if (fcb.i_data[0])
1165                         init_special_inode(inode, inode->i_mode,
1166                            old_decode_dev(le32_to_cpu(fcb.i_data[0])));
1167                 else
1168                         init_special_inode(inode, inode->i_mode,
1169                            new_decode_dev(le32_to_cpu(fcb.i_data[1])));
1170         }
1171
1172         unlock_new_inode(inode);
1173         return inode;
1174
1175 bad_inode:
1176         iget_failed(inode);
1177         return ERR_PTR(ret);
1178 }
1179
1180 int __exofs_wait_obj_created(struct exofs_i_info *oi)
1181 {
1182         if (!obj_created(oi)) {
1183                 EXOFS_DBGMSG("!obj_created\n");
1184                 BUG_ON(!obj_2bcreated(oi));
1185                 wait_event(oi->i_wq, obj_created(oi));
1186                 EXOFS_DBGMSG("wait_event done\n");
1187         }
1188         return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
1189 }
1190
1191 /*
1192  * Callback function from exofs_new_inode().  The important thing is that we
1193  * set the obj_created flag so that other methods know that the object exists on
1194  * the OSD.
1195  */
1196 static void create_done(struct ore_io_state *ios, void *p)
1197 {
1198         struct inode *inode = p;
1199         struct exofs_i_info *oi = exofs_i(inode);
1200         struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1201         int ret;
1202
1203         ret = ore_check_io(ios, NULL);
1204         ore_put_io_state(ios);
1205
1206         atomic_dec(&sbi->s_curr_pending);
1207
1208         if (unlikely(ret)) {
1209                 EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx",
1210                           _LLU(exofs_oi_objno(oi)),
1211                           _LLU(oi->one_comp.obj.partition));
1212                 /*TODO: When FS is corrupted creation can fail, object already
1213                  * exist. Get rid of this asynchronous creation, if exist
1214                  * increment the obj counter and try the next object. Until we
1215                  * succeed. All these dangling objects will be made into lost
1216                  * files by chkfs.exofs
1217                  */
1218         }
1219
1220         set_obj_created(oi);
1221
1222         wake_up(&oi->i_wq);
1223 }
1224
1225 /*
1226  * Set up a new inode and create an object for it on the OSD
1227  */
1228 struct inode *exofs_new_inode(struct inode *dir, int mode)
1229 {
1230         struct super_block *sb = dir->i_sb;
1231         struct exofs_sb_info *sbi = sb->s_fs_info;
1232         struct inode *inode;
1233         struct exofs_i_info *oi;
1234         struct ore_io_state *ios;
1235         int ret;
1236
1237         inode = new_inode(sb);
1238         if (!inode)
1239                 return ERR_PTR(-ENOMEM);
1240
1241         oi = exofs_i(inode);
1242         __oi_init(oi);
1243
1244         set_obj_2bcreated(oi);
1245
1246         inode->i_mapping->backing_dev_info = sb->s_bdi;
1247         inode_init_owner(inode, dir, mode);
1248         inode->i_ino = sbi->s_nextid++;
1249         inode->i_blkbits = EXOFS_BLKSHIFT;
1250         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1251         oi->i_commit_size = inode->i_size = 0;
1252         spin_lock(&sbi->s_next_gen_lock);
1253         inode->i_generation = sbi->s_next_generation++;
1254         spin_unlock(&sbi->s_next_gen_lock);
1255         insert_inode_hash(inode);
1256
1257         exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1258                          exofs_oi_objno(oi));
1259         exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
1260
1261         mark_inode_dirty(inode);
1262
1263         ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1264         if (unlikely(ret)) {
1265                 EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n");
1266                 return ERR_PTR(ret);
1267         }
1268
1269         ios->done = create_done;
1270         ios->private = inode;
1271
1272         ret = ore_create(ios);
1273         if (ret) {
1274                 ore_put_io_state(ios);
1275                 return ERR_PTR(ret);
1276         }
1277         atomic_inc(&sbi->s_curr_pending);
1278
1279         return inode;
1280 }
1281
1282 /*
1283  * struct to pass two arguments to update_inode's callback
1284  */
1285 struct updatei_args {
1286         struct exofs_sb_info    *sbi;
1287         struct exofs_fcb        fcb;
1288 };
1289
1290 /*
1291  * Callback function from exofs_update_inode().
1292  */
1293 static void updatei_done(struct ore_io_state *ios, void *p)
1294 {
1295         struct updatei_args *args = p;
1296
1297         ore_put_io_state(ios);
1298
1299         atomic_dec(&args->sbi->s_curr_pending);
1300
1301         kfree(args);
1302 }
1303
1304 /*
1305  * Write the inode to the OSD.  Just fill up the struct, and set the attribute
1306  * synchronously or asynchronously depending on the do_sync flag.
1307  */
1308 static int exofs_update_inode(struct inode *inode, int do_sync)
1309 {
1310         struct exofs_i_info *oi = exofs_i(inode);
1311         struct super_block *sb = inode->i_sb;
1312         struct exofs_sb_info *sbi = sb->s_fs_info;
1313         struct ore_io_state *ios;
1314         struct osd_attr attr;
1315         struct exofs_fcb *fcb;
1316         struct updatei_args *args;
1317         int ret;
1318
1319         args = kzalloc(sizeof(*args), GFP_KERNEL);
1320         if (!args) {
1321                 EXOFS_DBGMSG("Failed kzalloc of args\n");
1322                 return -ENOMEM;
1323         }
1324
1325         fcb = &args->fcb;
1326
1327         fcb->i_mode = cpu_to_le16(inode->i_mode);
1328         fcb->i_uid = cpu_to_le32(inode->i_uid);
1329         fcb->i_gid = cpu_to_le32(inode->i_gid);
1330         fcb->i_links_count = cpu_to_le16(inode->i_nlink);
1331         fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
1332         fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
1333         fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
1334         oi->i_commit_size = i_size_read(inode);
1335         fcb->i_size = cpu_to_le64(oi->i_commit_size);
1336         fcb->i_generation = cpu_to_le32(inode->i_generation);
1337
1338         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1339                 if (old_valid_dev(inode->i_rdev)) {
1340                         fcb->i_data[0] =
1341                                 cpu_to_le32(old_encode_dev(inode->i_rdev));
1342                         fcb->i_data[1] = 0;
1343                 } else {
1344                         fcb->i_data[0] = 0;
1345                         fcb->i_data[1] =
1346                                 cpu_to_le32(new_encode_dev(inode->i_rdev));
1347                         fcb->i_data[2] = 0;
1348                 }
1349         } else
1350                 memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
1351
1352         ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1353         if (unlikely(ret)) {
1354                 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1355                 goto free_args;
1356         }
1357
1358         attr = g_attr_inode_data;
1359         attr.val_ptr = fcb;
1360         ios->out_attr_len = 1;
1361         ios->out_attr = &attr;
1362
1363         wait_obj_created(oi);
1364
1365         if (!do_sync) {
1366                 args->sbi = sbi;
1367                 ios->done = updatei_done;
1368                 ios->private = args;
1369         }
1370
1371         ret = ore_write(ios);
1372         if (!do_sync && !ret) {
1373                 atomic_inc(&sbi->s_curr_pending);
1374                 goto out; /* deallocation in updatei_done */
1375         }
1376
1377         ore_put_io_state(ios);
1378 free_args:
1379         kfree(args);
1380 out:
1381         EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
1382                      inode->i_ino, do_sync, ret);
1383         return ret;
1384 }
1385
1386 int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
1387 {
1388         /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */
1389         return exofs_update_inode(inode, 1);
1390 }
1391
1392 /*
1393  * Callback function from exofs_delete_inode() - don't have much cleaning up to
1394  * do.
1395  */
1396 static void delete_done(struct ore_io_state *ios, void *p)
1397 {
1398         struct exofs_sb_info *sbi = p;
1399
1400         ore_put_io_state(ios);
1401
1402         atomic_dec(&sbi->s_curr_pending);
1403 }
1404
1405 /*
1406  * Called when the refcount of an inode reaches zero.  We remove the object
1407  * from the OSD here.  We make sure the object was created before we try and
1408  * delete it.
1409  */
1410 void exofs_evict_inode(struct inode *inode)
1411 {
1412         struct exofs_i_info *oi = exofs_i(inode);
1413         struct super_block *sb = inode->i_sb;
1414         struct exofs_sb_info *sbi = sb->s_fs_info;
1415         struct ore_io_state *ios;
1416         int ret;
1417
1418         truncate_inode_pages(&inode->i_data, 0);
1419
1420         /* TODO: should do better here */
1421         if (inode->i_nlink || is_bad_inode(inode))
1422                 goto no_delete;
1423
1424         inode->i_size = 0;
1425         end_writeback(inode);
1426
1427         /* if we are deleting an obj that hasn't been created yet, wait.
1428          * This also makes sure that create_done cannot be called with an
1429          * already evicted inode.
1430          */
1431         wait_obj_created(oi);
1432         /* ignore the error, attempt a remove anyway */
1433
1434         /* Now Remove the OSD objects */
1435         ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1436         if (unlikely(ret)) {
1437                 EXOFS_ERR("%s: ore_get_io_state failed\n", __func__);
1438                 return;
1439         }
1440
1441         ios->done = delete_done;
1442         ios->private = sbi;
1443
1444         ret = ore_remove(ios);
1445         if (ret) {
1446                 EXOFS_ERR("%s: ore_remove failed\n", __func__);
1447                 ore_put_io_state(ios);
1448                 return;
1449         }
1450         atomic_inc(&sbi->s_curr_pending);
1451
1452         return;
1453
1454 no_delete:
1455         end_writeback(inode);
1456 }