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 { BIO_MAX_PAGES_KMALLOC =
  41                 (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
  42         MAX_PAGES_KMALLOC =
  43                 PAGE_SIZE / sizeof(struct page *),
  44 };
  45
  46 unsigned exofs_max_io_pages(struct ore_layout *layout,
  47                             unsigned expected_pages)
  48 {
  49         unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC);
  50
  51         /* TODO: easily support bio chaining */
  52         pages =  min_t(unsigned, pages,
  53                        layout->group_width * BIO_MAX_PAGES_KMALLOC);
  54         return pages;
  55 }
  56
  57 struct page_collect {
  58         struct exofs_sb_info *sbi;
  59         struct inode *inode;
  60         unsigned expected_pages;
  61         struct ore_io_state *ios;
  62
  63         struct page **pages;
  64         unsigned alloc_pages;
  65         unsigned nr_pages;
  66         unsigned long length;
  67         loff_t pg_first; /* keep 64bit also in 32-arches */
  68         bool read_4_write; /* This means two things: that the read is sync
  69                             * And the pages should not be unlocked.
  70                             */
  71 };
  72
  73 static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
  74                        struct inode *inode)
  75 {
  76         struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
  77
  78         pcol->sbi = sbi;
  79         pcol->inode = inode;
  80         pcol->expected_pages = expected_pages;
  81
  82         pcol->ios = NULL;
  83         pcol->pages = NULL;
  84         pcol->alloc_pages = 0;
  85         pcol->nr_pages = 0;
  86         pcol->length = 0;
  87         pcol->pg_first = -1;
  88         pcol->read_4_write = false;
  89 }
  90
  91 static void _pcol_reset(struct page_collect *pcol)
  92 {
  93         pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
  94
  95         pcol->pages = NULL;
  96         pcol->alloc_pages = 0;
  97         pcol->nr_pages = 0;
  98         pcol->length = 0;
  99         pcol->pg_first = -1;
 100         pcol->ios = NULL;
 101
 102         /* this is probably the end of the loop but in writes
 103          * it might not end here. don't be left with nothing
 104          */
 105         if (!pcol->expected_pages)
 106                 pcol->expected_pages = MAX_PAGES_KMALLOC;
 107 }
 108
 109 static int pcol_try_alloc(struct page_collect *pcol)
 110 {
 111         unsigned pages;
 112
 113         /* TODO: easily support bio chaining */
 114         pages =  exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages);
 115
 116         for (; pages; pages >>= 1) {
 117                 pcol->pages = kmalloc(pages * sizeof(struct page *),
 118                                       GFP_KERNEL);
 119                 if (likely(pcol->pages)) {
 120                         pcol->alloc_pages = pages;
 121                         return 0;
 122                 }
 123         }
 124
 125         EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
 126                   pcol->expected_pages);
 127         return -ENOMEM;
 128 }
 129
 130 static void pcol_free(struct page_collect *pcol)
 131 {
 132         kfree(pcol->pages);
 133         pcol->pages = NULL;
 134
 135         if (pcol->ios) {
 136                 ore_put_io_state(pcol->ios);
 137                 pcol->ios = NULL;
 138         }
 139 }
 140
 141 static int pcol_add_page(struct page_collect *pcol, struct page *page,
 142                          unsigned len)
 143 {
 144         if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
 145                 return -ENOMEM;
 146
 147         pcol->pages[pcol->nr_pages++] = page;
 148         pcol->length += len;
 149         return 0;
 150 }
 151
 152 enum {PAGE_WAS_NOT_IN_IO = 17};
 153 static int update_read_page(struct page *page, int ret)
 154 {
 155         switch (ret) {
 156         case 0:
 157                 /* Everything is OK */
 158                 SetPageUptodate(page);
 159                 if (PageError(page))
 160                         ClearPageError(page);
 161                 break;
 162         case -EFAULT:
 163                 /* In this case we were trying to read something that wasn't on
 164                  * disk yet - return a page full of zeroes.  This should be OK,
 165                  * because the object should be empty (if there was a write
 166                  * before this read, the read would be waiting with the page
 167                  * locked */
 168                 clear_highpage(page);
 169
 170                 SetPageUptodate(page);
 171                 if (PageError(page))
 172                         ClearPageError(page);
 173                 EXOFS_DBGMSG("recovered read error\n");
 174                 /* fall through */
 175         case PAGE_WAS_NOT_IN_IO:
 176                 ret = 0; /* recovered error */
 177                 break;
 178         default:
 179                 SetPageError(page);
 180         }
 181         return ret;
 182 }
 183
 184 static void update_write_page(struct page *page, int ret)
 185 {
 186         if (unlikely(ret == PAGE_WAS_NOT_IN_IO))
 187                 return; /* don't pass start don't collect $200 */
 188
 189         if (ret) {
 190                 mapping_set_error(page->mapping, ret);
 191                 SetPageError(page);
 192         }
 193         end_page_writeback(page);
 194 }
 195
 196 /* Called at the end of reads, to optionally unlock pages and update their
 197  * status.
 198  */
 199 static int __readpages_done(struct page_collect *pcol)
 200 {
 201         int i;
 202         u64 resid;
 203         u64 good_bytes;
 204         u64 length = 0;
 205         int ret = ore_check_io(pcol->ios, &resid);
 206
 207         if (likely(!ret)) {
 208                 good_bytes = pcol->length;
 209                 ret = PAGE_WAS_NOT_IN_IO;
 210         } else {
 211                 good_bytes = pcol->length - resid;
 212         }
 213         if (good_bytes > pcol->ios->length)
 214                 good_bytes = pcol->ios->length;
 215
 216         EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
 217                      " length=0x%lx nr_pages=%u\n",
 218                      pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
 219                      pcol->nr_pages);
 220
 221         for (i = 0; i < pcol->nr_pages; i++) {
 222                 struct page *page = pcol->pages[i];
 223                 struct inode *inode = page->mapping->host;
 224                 int page_stat;
 225
 226                 if (inode != pcol->inode)
 227                         continue; /* osd might add more pages at end */
 228
 229                 if (likely(length < good_bytes))
 230                         page_stat = 0;
 231                 else
 232                         page_stat = ret;
 233
 234                 EXOFS_DBGMSG2("    readpages_done(0x%lx, 0x%lx) %s\n",
 235                           inode->i_ino, page->index,
 236                           page_stat ? "bad_bytes" : "good_bytes");
 237
 238                 ret = update_read_page(page, page_stat);
 239                 if (!pcol->read_4_write)
 240                         unlock_page(page);
 241                 length += PAGE_SIZE;
 242         }
 243
 244         pcol_free(pcol);
 245         EXOFS_DBGMSG2("readpages_done END\n");
 246         return ret;
 247 }
 248
 249 /* callback of async reads */
 250 static void readpages_done(struct ore_io_state *ios, void *p)
 251 {
 252         struct page_collect *pcol = p;
 253
 254         __readpages_done(pcol);
 255         atomic_dec(&pcol->sbi->s_curr_pending);
 256         kfree(pcol);
 257 }
 258
 259 static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
 260 {
 261         int i;
 262
 263         for (i = 0; i < pcol->nr_pages; i++) {
 264                 struct page *page = pcol->pages[i];
 265
 266                 if (rw == READ)
 267                         update_read_page(page, ret);
 268                 else
 269                         update_write_page(page, ret);
 270
 271                 unlock_page(page);
 272         }
 273 }
 274
 275 static int _maybe_not_all_in_one_io(struct ore_io_state *ios,
 276         struct page_collect *pcol_src, struct page_collect *pcol)
 277 {
 278         /* length was wrong or offset was not page aligned */
 279         BUG_ON(pcol_src->nr_pages < ios->nr_pages);
 280
 281         if (pcol_src->nr_pages > ios->nr_pages) {
 282                 struct page **src_page;
 283                 unsigned pages_less = pcol_src->nr_pages - ios->nr_pages;
 284                 unsigned long len_less = pcol_src->length - ios->length;
 285                 unsigned i;
 286                 int ret;
 287
 288                 /* This IO was trimmed */
 289                 pcol_src->nr_pages = ios->nr_pages;
 290                 pcol_src->length = ios->length;
 291
 292                 /* Left over pages are passed to the next io */
 293                 pcol->expected_pages += pages_less;
 294                 pcol->nr_pages = pages_less;
 295                 pcol->length = len_less;
 296                 src_page = pcol_src->pages + pcol_src->nr_pages;
 297                 pcol->pg_first = (*src_page)->index;
 298
 299                 ret = pcol_try_alloc(pcol);
 300                 if (unlikely(ret))
 301                         return ret;
 302
 303                 for (i = 0; i < pages_less; ++i)
 304                         pcol->pages[i] = *src_page++;
 305
 306                 EXOFS_DBGMSG("Length was adjusted nr_pages=0x%x "
 307                         "pages_less=0x%x expected_pages=0x%x "
 308                         "next_offset=0x%llx next_len=0x%lx\n",
 309                         pcol_src->nr_pages, pages_less, pcol->expected_pages,
 310                         pcol->pg_first * PAGE_SIZE, pcol->length);
 311         }
 312         return 0;
 313 }
 314
 315 static int read_exec(struct page_collect *pcol)
 316 {
 317         struct exofs_i_info *oi = exofs_i(pcol->inode);
 318         struct ore_io_state *ios;
 319         struct page_collect *pcol_copy = NULL;
 320         int ret;
 321
 322         if (!pcol->pages)
 323                 return 0;
 324
 325         if (!pcol->ios) {
 326                 int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true,
 327                                              pcol->pg_first << PAGE_CACHE_SHIFT,
 328                                              pcol->length, &pcol->ios);
 329
 330                 if (ret)
 331                         return ret;
 332         }
 333
 334         ios = pcol->ios;
 335         ios->pages = pcol->pages;
 336
 337         if (pcol->read_4_write) {
 338                 ore_read(pcol->ios);
 339                 return __readpages_done(pcol);
 340         }
 341
 342         pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
 343         if (!pcol_copy) {
 344                 ret = -ENOMEM;
 345                 goto err;
 346         }
 347
 348         *pcol_copy = *pcol;
 349         ios->done = readpages_done;
 350         ios->private = pcol_copy;
 351
 352         /* pages ownership was passed to pcol_copy */
 353         _pcol_reset(pcol);
 354
 355         ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
 356         if (unlikely(ret))
 357                 goto err;
 358
 359         EXOFS_DBGMSG2("read_exec(0x%lx) offset=0x%llx length=0x%llx\n",
 360                 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
 361
 362         ret = ore_read(ios);
 363         if (unlikely(ret))
 364                 goto err;
 365
 366         atomic_inc(&pcol->sbi->s_curr_pending);
 367
 368         return 0;
 369
 370 err:
 371         if (!pcol->read_4_write)
 372                 _unlock_pcol_pages(pcol, ret, READ);
 373
 374         pcol_free(pcol);
 375
 376         kfree(pcol_copy);
 377         return ret;
 378 }
 379
 380 /* readpage_strip is called either directly from readpage() or by the VFS from
 381  * within read_cache_pages(), to add one more page to be read. It will try to
 382  * collect as many contiguous pages as posible. If a discontinuity is
 383  * encountered, or it runs out of resources, it will submit the previous segment
 384  * and will start a new collection. Eventually caller must submit the last
 385  * segment if present.
 386  */
 387 static int readpage_strip(void *data, struct page *page)
 388 {
 389         struct page_collect *pcol = data;
 390         struct inode *inode = pcol->inode;
 391         struct exofs_i_info *oi = exofs_i(inode);
 392         loff_t i_size = i_size_read(inode);
 393         pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 394         size_t len;
 395         int ret;
 396
 397         /* FIXME: Just for debugging, will be removed */
 398         if (PageUptodate(page))
 399                 EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
 400                           page->index);
 401
 402         if (page->index < end_index)
 403                 len = PAGE_CACHE_SIZE;
 404         else if (page->index == end_index)
 405                 len = i_size & ~PAGE_CACHE_MASK;
 406         else
 407                 len = 0;
 408
 409         if (!len || !obj_created(oi)) {
 410                 /* this will be out of bounds, or doesn't exist yet.
 411                  * Current page is cleared and the request is split
 412                  */
 413                 clear_highpage(page);
 414
 415                 SetPageUptodate(page);
 416                 if (PageError(page))
 417                         ClearPageError(page);
 418
 419                 if (!pcol->read_4_write)
 420                         unlock_page(page);
 421                 EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx "
 422                              "read_4_write=%d index=0x%lx end_index=0x%lx "
 423                              "splitting\n", inode->i_ino, len,
 424                              pcol->read_4_write, page->index, end_index);
 425
 426                 return read_exec(pcol);
 427         }
 428
 429 try_again:
 430
 431         if (unlikely(pcol->pg_first == -1)) {
 432                 pcol->pg_first = page->index;
 433         } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
 434                    page->index)) {
 435                 /* Discontinuity detected, split the request */
 436                 ret = read_exec(pcol);
 437                 if (unlikely(ret))
 438                         goto fail;
 439                 goto try_again;
 440         }
 441
 442         if (!pcol->pages) {
 443                 ret = pcol_try_alloc(pcol);
 444                 if (unlikely(ret))
 445                         goto fail;
 446         }
 447
 448         if (len != PAGE_CACHE_SIZE)
 449                 zero_user(page, len, PAGE_CACHE_SIZE - len);
 450
 451         EXOFS_DBGMSG2("    readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
 452                      inode->i_ino, page->index, len);
 453
 454         ret = pcol_add_page(pcol, page, len);
 455         if (ret) {
 456                 EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
 457                           "this_len=0x%zx nr_pages=%u length=0x%lx\n",
 458                           page, len, pcol->nr_pages, pcol->length);
 459
 460                 /* split the request, and start again with current page */
 461                 ret = read_exec(pcol);
 462                 if (unlikely(ret))
 463                         goto fail;
 464
 465                 goto try_again;
 466         }
 467
 468         return 0;
 469
 470 fail:
 471         /* SetPageError(page); ??? */
 472         unlock_page(page);
 473         return ret;
 474 }
 475
 476 static int exofs_readpages(struct file *file, struct address_space *mapping,
 477                            struct list_head *pages, unsigned nr_pages)
 478 {
 479         struct page_collect pcol;
 480         int ret;
 481
 482         _pcol_init(&pcol, nr_pages, mapping->host);
 483
 484         ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
 485         if (ret) {
 486                 EXOFS_ERR("read_cache_pages => %d\n", ret);
 487                 return ret;
 488         }
 489
 490         ret = read_exec(&pcol);
 491         if (unlikely(ret))
 492                 return ret;
 493
 494         return read_exec(&pcol);
 495 }
 496
 497 static int _readpage(struct page *page, bool read_4_write)
 498 {
 499         struct page_collect pcol;
 500         int ret;
 501
 502         _pcol_init(&pcol, 1, page->mapping->host);
 503
 504         pcol.read_4_write = read_4_write;
 505         ret = readpage_strip(&pcol, page);
 506         if (ret) {
 507                 EXOFS_ERR("_readpage => %d\n", ret);
 508                 return ret;
 509         }
 510
 511         return read_exec(&pcol);
 512 }
 513
 514 /*
 515  * We don't need the file
 516  */
 517 static int exofs_readpage(struct file *file, struct page *page)
 518 {
 519         return _readpage(page, false);
 520 }
 521
 522 /* Callback for osd_write. All writes are asynchronous */
 523 static void writepages_done(struct ore_io_state *ios, void *p)
 524 {
 525         struct page_collect *pcol = p;
 526         int i;
 527         u64 resid;
 528         u64  good_bytes;
 529         u64  length = 0;
 530         int ret = ore_check_io(ios, &resid);
 531
 532         atomic_dec(&pcol->sbi->s_curr_pending);
 533
 534         if (likely(!ret)) {
 535                 good_bytes = pcol->length;
 536                 ret = PAGE_WAS_NOT_IN_IO;
 537         } else {
 538                 good_bytes = pcol->length - resid;
 539         }
 540         if (good_bytes > pcol->ios->length)
 541                 good_bytes = pcol->ios->length;
 542
 543         EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
 544                      " length=0x%lx nr_pages=%u\n",
 545                      pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
 546                      pcol->nr_pages);
 547
 548         for (i = 0; i < pcol->nr_pages; i++) {
 549                 struct page *page = pcol->pages[i];
 550                 struct inode *inode = page->mapping->host;
 551                 int page_stat;
 552
 553                 if (inode != pcol->inode)
 554                         continue; /* osd might add more pages to a bio */
 555
 556                 if (likely(length < good_bytes))
 557                         page_stat = 0;
 558                 else
 559                         page_stat = ret;
 560
 561                 update_write_page(page, page_stat);
 562                 unlock_page(page);
 563                 EXOFS_DBGMSG2("    writepages_done(0x%lx, 0x%lx) status=%d\n",
 564                              inode->i_ino, page->index, page_stat);
 565
 566                 length += PAGE_SIZE;
 567         }
 568
 569         pcol_free(pcol);
 570         kfree(pcol);
 571         EXOFS_DBGMSG2("writepages_done END\n");
 572 }
 573
 574 static int write_exec(struct page_collect *pcol)
 575 {
 576         struct exofs_i_info *oi = exofs_i(pcol->inode);
 577         struct ore_io_state *ios;
 578         struct page_collect *pcol_copy = NULL;
 579         int ret;
 580
 581         if (!pcol->pages)
 582                 return 0;
 583
 584         BUG_ON(pcol->ios);
 585         ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false,
 586                                  pcol->pg_first << PAGE_CACHE_SHIFT,
 587                                  pcol->length, &pcol->ios);
 588         if (unlikely(ret))
 589                 goto err;
 590
 591         pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
 592         if (!pcol_copy) {
 593                 EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
 594                 ret = -ENOMEM;
 595                 goto err;
 596         }
 597
 598         *pcol_copy = *pcol;
 599
 600         ios = pcol->ios;
 601         ios->pages = pcol_copy->pages;
 602         ios->done = writepages_done;
 603         ios->private = pcol_copy;
 604
 605         /* pages ownership was passed to pcol_copy */
 606         _pcol_reset(pcol);
 607
 608         ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
 609         if (unlikely(ret))
 610                 goto err;
 611
 612         EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n",
 613                 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
 614
 615         ret = ore_write(ios);
 616         if (unlikely(ret)) {
 617                 EXOFS_ERR("write_exec: ore_write() Failed\n");
 618                 goto err;
 619         }
 620
 621         atomic_inc(&pcol->sbi->s_curr_pending);
 622         return 0;
 623
 624 err:
 625         _unlock_pcol_pages(pcol, ret, WRITE);
 626         pcol_free(pcol);
 627         kfree(pcol_copy);
 628
 629         return ret;
 630 }
 631
 632 /* writepage_strip is called either directly from writepage() or by the VFS from
 633  * within write_cache_pages(), to add one more page to be written to storage.
 634  * It will try to collect as many contiguous pages as possible. If a
 635  * discontinuity is encountered or it runs out of resources it will submit the
 636  * previous segment and will start a new collection.
 637  * Eventually caller must submit the last segment if present.
 638  */
 639 static int writepage_strip(struct page *page,
 640                            struct writeback_control *wbc_unused, void *data)
 641 {
 642         struct page_collect *pcol = data;
 643         struct inode *inode = pcol->inode;
 644         struct exofs_i_info *oi = exofs_i(inode);
 645         loff_t i_size = i_size_read(inode);
 646         pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 647         size_t len;
 648         int ret;
 649
 650         BUG_ON(!PageLocked(page));
 651
 652         ret = wait_obj_created(oi);
 653         if (unlikely(ret))
 654                 goto fail;
 655
 656         if (page->index < end_index)
 657                 /* in this case, the page is within the limits of the file */
 658                 len = PAGE_CACHE_SIZE;
 659         else {
 660                 len = i_size & ~PAGE_CACHE_MASK;
 661
 662                 if (page->index > end_index || !len) {
 663                         /* in this case, the page is outside the limits
 664                          * (truncate in progress)
 665                          */
 666                         ret = write_exec(pcol);
 667                         if (unlikely(ret))
 668                                 goto fail;
 669                         if (PageError(page))
 670                                 ClearPageError(page);
 671                         unlock_page(page);
 672                         EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
 673                                      "outside the limits\n",
 674                                      inode->i_ino, page->index);
 675                         return 0;
 676                 }
 677         }
 678
 679 try_again:
 680
 681         if (unlikely(pcol->pg_first == -1)) {
 682                 pcol->pg_first = page->index;
 683         } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
 684                    page->index)) {
 685                 /* Discontinuity detected, split the request */
 686                 ret = write_exec(pcol);
 687                 if (unlikely(ret))
 688                         goto fail;
 689
 690                 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
 691                              inode->i_ino, page->index);
 692                 goto try_again;
 693         }
 694
 695         if (!pcol->pages) {
 696                 ret = pcol_try_alloc(pcol);
 697                 if (unlikely(ret))
 698                         goto fail;
 699         }
 700
 701         EXOFS_DBGMSG2("    writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
 702                      inode->i_ino, page->index, len);
 703
 704         ret = pcol_add_page(pcol, page, len);
 705         if (unlikely(ret)) {
 706                 EXOFS_DBGMSG2("Failed pcol_add_page "
 707                              "nr_pages=%u total_length=0x%lx\n",
 708                              pcol->nr_pages, pcol->length);
 709
 710                 /* split the request, next loop will start again */
 711                 ret = write_exec(pcol);
 712                 if (unlikely(ret)) {
 713                         EXOFS_DBGMSG("write_exec failed => %d", ret);
 714                         goto fail;
 715                 }
 716
 717                 goto try_again;
 718         }
 719
 720         BUG_ON(PageWriteback(page));
 721         set_page_writeback(page);
 722
 723         return 0;
 724
 725 fail:
 726         EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
 727                      inode->i_ino, page->index, ret);
 728         set_bit(AS_EIO, &page->mapping->flags);
 729         unlock_page(page);
 730         return ret;
 731 }
 732
 733 static int exofs_writepages(struct address_space *mapping,
 734                        struct writeback_control *wbc)
 735 {
 736         struct page_collect pcol;
 737         long start, end, expected_pages;
 738         int ret;
 739
 740         start = wbc->range_start >> PAGE_CACHE_SHIFT;
 741         end = (wbc->range_end == LLONG_MAX) ?
 742                         start + mapping->nrpages :
 743                         wbc->range_end >> PAGE_CACHE_SHIFT;
 744
 745         if (start || end)
 746                 expected_pages = end - start + 1;
 747         else
 748                 expected_pages = mapping->nrpages;
 749
 750         if (expected_pages < 32L)
 751                 expected_pages = 32L;
 752
 753         EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
 754                      "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
 755                      mapping->host->i_ino, wbc->range_start, wbc->range_end,
 756                      mapping->nrpages, start, end, expected_pages);
 757
 758         _pcol_init(&pcol, expected_pages, mapping->host);
 759
 760         ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
 761         if (unlikely(ret)) {
 762                 EXOFS_ERR("write_cache_pages => %d\n", ret);
 763                 return ret;
 764         }
 765
 766         ret = write_exec(&pcol);
 767         if (unlikely(ret))
 768                 return ret;
 769
 770         if (wbc->sync_mode == WB_SYNC_ALL) {
 771                 return write_exec(&pcol); /* pump the last reminder */
 772         } else if (pcol.nr_pages) {
 773                 /* not SYNC let the reminder join the next writeout */
 774                 unsigned i;
 775
 776                 for (i = 0; i < pcol.nr_pages; i++) {
 777                         struct page *page = pcol.pages[i];
 778
 779                         end_page_writeback(page);
 780                         set_page_dirty(page);
 781                         unlock_page(page);
 782                 }
 783         }
 784         return 0;
 785 }
 786
 787 static int exofs_writepage(struct page *page, struct writeback_control *wbc)
 788 {
 789         struct page_collect pcol;
 790         int ret;
 791
 792         _pcol_init(&pcol, 1, page->mapping->host);
 793
 794         ret = writepage_strip(page, NULL, &pcol);
 795         if (ret) {
 796                 EXOFS_ERR("exofs_writepage => %d\n", ret);
 797                 return ret;
 798         }
 799
 800         return write_exec(&pcol);
 801 }
 802
 803 /* i_mutex held using inode->i_size directly */
 804 static void _write_failed(struct inode *inode, loff_t to)
 805 {
 806         if (to > inode->i_size)
 807                 truncate_pagecache(inode, to, inode->i_size);
 808 }
 809
 810 int exofs_write_begin(struct file *file, struct address_space *mapping,
 811                 loff_t pos, unsigned len, unsigned flags,
 812                 struct page **pagep, void **fsdata)
 813 {
 814         int ret = 0;
 815         struct page *page;
 816
 817         page = *pagep;
 818         if (page == NULL) {
 819                 ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
 820                                          fsdata);
 821                 if (ret) {
 822                         EXOFS_DBGMSG("simple_write_begin failed\n");
 823                         goto out;
 824                 }
 825
 826                 page = *pagep;
 827         }
 828
 829          /* read modify write */
 830         if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
 831                 loff_t i_size = i_size_read(mapping->host);
 832                 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 833                 size_t rlen;
 834
 835                 if (page->index < end_index)
 836                         rlen = PAGE_CACHE_SIZE;
 837                 else if (page->index == end_index)
 838                         rlen = i_size & ~PAGE_CACHE_MASK;
 839                 else
 840                         rlen = 0;
 841
 842                 if (!rlen) {
 843                         clear_highpage(page);
 844                         SetPageUptodate(page);
 845                         goto out;
 846                 }
 847
 848                 ret = _readpage(page, true);
 849                 if (ret) {
 850                         /*SetPageError was done by _readpage. Is it ok?*/
 851                         unlock_page(page);
 852                         EXOFS_DBGMSG("__readpage failed\n");
 853                 }
 854         }
 855 out:
 856         if (unlikely(ret))
 857                 _write_failed(mapping->host, pos + len);
 858
 859         return ret;
 860 }
 861
 862 static int exofs_write_begin_export(struct file *file,
 863                 struct address_space *mapping,
 864                 loff_t pos, unsigned len, unsigned flags,
 865                 struct page **pagep, void **fsdata)
 866 {
 867         *pagep = NULL;
 868
 869         return exofs_write_begin(file, mapping, pos, len, flags, pagep,
 870                                         fsdata);
 871 }
 872
 873 static int exofs_write_end(struct file *file, struct address_space *mapping,
 874                         loff_t pos, unsigned len, unsigned copied,
 875                         struct page *page, void *fsdata)
 876 {
 877         struct inode *inode = mapping->host;
 878         /* According to comment in simple_write_end i_mutex is held */
 879         loff_t i_size = inode->i_size;
 880         int ret;
 881
 882         ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
 883         if (unlikely(ret))
 884                 _write_failed(inode, pos + len);
 885
 886         /* TODO: once simple_write_end marks inode dirty remove */
 887         if (i_size != inode->i_size)
 888                 mark_inode_dirty(inode);
 889         return ret;
 890 }
 891
 892 static int exofs_releasepage(struct page *page, gfp_t gfp)
 893 {
 894         EXOFS_DBGMSG("page 0x%lx\n", page->index);
 895         WARN_ON(1);
 896         return 0;
 897 }
 898
 899 static void exofs_invalidatepage(struct page *page, unsigned long offset)
 900 {
 901         EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset);
 902         WARN_ON(1);
 903 }
 904
 905 const struct address_space_operations exofs_aops = {
 906         .readpage       = exofs_readpage,
 907         .readpages      = exofs_readpages,
 908         .writepage      = exofs_writepage,
 909         .writepages     = exofs_writepages,
 910         .write_begin    = exofs_write_begin_export,
 911         .write_end      = exofs_write_end,
 912         .releasepage    = exofs_releasepage,
 913         .set_page_dirty = __set_page_dirty_nobuffers,
 914         .invalidatepage = exofs_invalidatepage,
 915
 916         /* Not implemented Yet */
 917         .bmap           = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
 918         .direct_IO      = NULL, /* TODO: Should be trivial to do */
 919
 920         /* With these NULL has special meaning or default is not exported */
 921         .get_xip_mem    = NULL,
 922         .migratepage    = NULL,
 923         .launder_page   = NULL,
 924         .is_partially_uptodate = NULL,
 925         .error_remove_page = NULL,
 926 };
 927
 928 /******************************************************************************
 929  * INODE OPERATIONS
 930  *****************************************************************************/
 931
 932 /*
 933  * Test whether an inode is a fast symlink.
 934  */
 935 static inline int exofs_inode_is_fast_symlink(struct inode *inode)
 936 {
 937         struct exofs_i_info *oi = exofs_i(inode);
 938
 939         return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
 940 }
 941
 942 static int _do_truncate(struct inode *inode, loff_t newsize)
 943 {
 944         struct exofs_i_info *oi = exofs_i(inode);
 945         struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
 946         int ret;
 947
 948         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 949
 950         ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize);
 951         if (likely(!ret))
 952                 truncate_setsize(inode, newsize);
 953
 954         EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n",
 955                      inode->i_ino, newsize, ret);
 956         return ret;
 957 }
 958
 959 /*
 960  * Set inode attributes - update size attribute on OSD if needed,
 961  *                        otherwise just call generic functions.
 962  */
 963 int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
 964 {
 965         struct inode *inode = dentry->d_inode;
 966         int error;
 967
 968         /* if we are about to modify an object, and it hasn't been
 969          * created yet, wait
 970          */
 971         error = wait_obj_created(exofs_i(inode));
 972         if (unlikely(error))
 973                 return error;
 974
 975         error = inode_change_ok(inode, iattr);
 976         if (unlikely(error))
 977                 return error;
 978
 979         if ((iattr->ia_valid & ATTR_SIZE) &&
 980             iattr->ia_size != i_size_read(inode)) {
 981                 error = _do_truncate(inode, iattr->ia_size);
 982                 if (unlikely(error))
 983                         return error;
 984         }
 985
 986         setattr_copy(inode, iattr);
 987         mark_inode_dirty(inode);
 988         return 0;
 989 }
 990
 991 static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
 992         EXOFS_APAGE_FS_DATA,
 993         EXOFS_ATTR_INODE_FILE_LAYOUT,
 994         0);
 995 static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
 996         EXOFS_APAGE_FS_DATA,
 997         EXOFS_ATTR_INODE_DIR_LAYOUT,
 998         0);
 999
1000 /*
1001  * Read the Linux inode info from the OSD, and return it as is. In exofs the
1002  * inode info is in an application specific page/attribute of the osd-object.
1003  */
1004 static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
1005                     struct exofs_fcb *inode)
1006 {
1007         struct exofs_sb_info *sbi = sb->s_fs_info;
1008         struct osd_attr attrs[] = {
1009                 [0] = g_attr_inode_data,
1010                 [1] = g_attr_inode_file_layout,
1011                 [2] = g_attr_inode_dir_layout,
1012         };
1013         struct ore_io_state *ios;
1014         struct exofs_on_disk_inode_layout *layout;
1015         int ret;
1016
1017         ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1018         if (unlikely(ret)) {
1019                 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1020                 return ret;
1021         }
1022
1023         attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1024         attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1025
1026         ios->in_attr = attrs;
1027         ios->in_attr_len = ARRAY_SIZE(attrs);
1028
1029         ret = ore_read(ios);
1030         if (unlikely(ret)) {
1031                 EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
1032                           _LLU(oi->one_comp.obj.id), ret);
1033                 memset(inode, 0, sizeof(*inode));
1034                 inode->i_mode = 0040000 | (0777 & ~022);
1035                 /* If object is lost on target we might as well enable it's
1036                  * delete.
1037                  */
1038                 if ((ret == -ENOENT) || (ret == -EINVAL))
1039                         ret = 0;
1040                 goto out;
1041         }
1042
1043         ret = extract_attr_from_ios(ios, &attrs[0]);
1044         if (ret) {
1045                 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1046                 goto out;
1047         }
1048         WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
1049         memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
1050
1051         ret = extract_attr_from_ios(ios, &attrs[1]);
1052         if (ret) {
1053                 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1054                 goto out;
1055         }
1056         if (attrs[1].len) {
1057                 layout = attrs[1].val_ptr;
1058                 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1059                         EXOFS_ERR("%s: unsupported files layout %d\n",
1060                                 __func__, layout->gen_func);
1061                         ret = -ENOTSUPP;
1062                         goto out;
1063                 }
1064         }
1065
1066         ret = extract_attr_from_ios(ios, &attrs[2]);
1067         if (ret) {
1068                 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1069                 goto out;
1070         }
1071         if (attrs[2].len) {
1072                 layout = attrs[2].val_ptr;
1073                 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1074                         EXOFS_ERR("%s: unsupported meta-data layout %d\n",
1075                                 __func__, layout->gen_func);
1076                         ret = -ENOTSUPP;
1077                         goto out;
1078                 }
1079         }
1080
1081 out:
1082         ore_put_io_state(ios);
1083         return ret;
1084 }
1085
1086 static void __oi_init(struct exofs_i_info *oi)
1087 {
1088         init_waitqueue_head(&oi->i_wq);
1089         oi->i_flags = 0;
1090 }
1091 /*
1092  * Fill in an inode read from the OSD and set it up for use
1093  */
1094 struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
1095 {
1096         struct exofs_i_info *oi;
1097         struct exofs_fcb fcb;
1098         struct inode *inode;
1099         int ret;
1100
1101         inode = iget_locked(sb, ino);
1102         if (!inode)
1103                 return ERR_PTR(-ENOMEM);
1104         if (!(inode->i_state & I_NEW))
1105                 return inode;
1106         oi = exofs_i(inode);
1107         __oi_init(oi);
1108         exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1109                          exofs_oi_objno(oi));
1110
1111         /* read the inode from the osd */
1112         ret = exofs_get_inode(sb, oi, &fcb);
1113         if (ret)
1114                 goto bad_inode;
1115
1116         set_obj_created(oi);
1117
1118         /* copy stuff from on-disk struct to in-memory struct */
1119         inode->i_mode = le16_to_cpu(fcb.i_mode);
1120         inode->i_uid = le32_to_cpu(fcb.i_uid);
1121         inode->i_gid = le32_to_cpu(fcb.i_gid);
1122         inode->i_nlink = le16_to_cpu(fcb.i_links_count);
1123         inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
1124         inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
1125         inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
1126         inode->i_ctime.tv_nsec =
1127                 inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
1128         oi->i_commit_size = le64_to_cpu(fcb.i_size);
1129         i_size_write(inode, oi->i_commit_size);
1130         inode->i_blkbits = EXOFS_BLKSHIFT;
1131         inode->i_generation = le32_to_cpu(fcb.i_generation);
1132
1133         oi->i_dir_start_lookup = 0;
1134
1135         if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
1136                 ret = -ESTALE;
1137                 goto bad_inode;
1138         }
1139
1140         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1141                 if (fcb.i_data[0])
1142                         inode->i_rdev =
1143                                 old_decode_dev(le32_to_cpu(fcb.i_data[0]));
1144                 else
1145                         inode->i_rdev =
1146                                 new_decode_dev(le32_to_cpu(fcb.i_data[1]));
1147         } else {
1148                 memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
1149         }
1150
1151         inode->i_mapping->backing_dev_info = sb->s_bdi;
1152         if (S_ISREG(inode->i_mode)) {
1153                 inode->i_op = &exofs_file_inode_operations;
1154                 inode->i_fop = &exofs_file_operations;
1155                 inode->i_mapping->a_ops = &exofs_aops;
1156         } else if (S_ISDIR(inode->i_mode)) {
1157                 inode->i_op = &exofs_dir_inode_operations;
1158                 inode->i_fop = &exofs_dir_operations;
1159                 inode->i_mapping->a_ops = &exofs_aops;
1160         } else if (S_ISLNK(inode->i_mode)) {
1161                 if (exofs_inode_is_fast_symlink(inode))
1162                         inode->i_op = &exofs_fast_symlink_inode_operations;
1163                 else {
1164                         inode->i_op = &exofs_symlink_inode_operations;
1165                         inode->i_mapping->a_ops = &exofs_aops;
1166                 }
1167         } else {
1168                 inode->i_op = &exofs_special_inode_operations;
1169                 if (fcb.i_data[0])
1170                         init_special_inode(inode, inode->i_mode,
1171                            old_decode_dev(le32_to_cpu(fcb.i_data[0])));
1172                 else
1173                         init_special_inode(inode, inode->i_mode,
1174                            new_decode_dev(le32_to_cpu(fcb.i_data[1])));
1175         }
1176
1177         unlock_new_inode(inode);
1178         return inode;
1179
1180 bad_inode:
1181         iget_failed(inode);
1182         return ERR_PTR(ret);
1183 }
1184
1185 int __exofs_wait_obj_created(struct exofs_i_info *oi)
1186 {
1187         if (!obj_created(oi)) {
1188                 EXOFS_DBGMSG("!obj_created\n");
1189                 BUG_ON(!obj_2bcreated(oi));
1190                 wait_event(oi->i_wq, obj_created(oi));
1191                 EXOFS_DBGMSG("wait_event done\n");
1192         }
1193         return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
1194 }
1195
1196 /*
1197  * Callback function from exofs_new_inode().  The important thing is that we
1198  * set the obj_created flag so that other methods know that the object exists on
1199  * the OSD.
1200  */
1201 static void create_done(struct ore_io_state *ios, void *p)
1202 {
1203         struct inode *inode = p;
1204         struct exofs_i_info *oi = exofs_i(inode);
1205         struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1206         int ret;
1207
1208         ret = ore_check_io(ios, NULL);
1209         ore_put_io_state(ios);
1210
1211         atomic_dec(&sbi->s_curr_pending);
1212
1213         if (unlikely(ret)) {
1214                 EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx",
1215                           _LLU(exofs_oi_objno(oi)),
1216                           _LLU(oi->one_comp.obj.partition));
1217                 /*TODO: When FS is corrupted creation can fail, object already
1218                  * exist. Get rid of this asynchronous creation, if exist
1219                  * increment the obj counter and try the next object. Until we
1220                  * succeed. All these dangling objects will be made into lost
1221                  * files by chkfs.exofs
1222                  */
1223         }
1224
1225         set_obj_created(oi);
1226
1227         wake_up(&oi->i_wq);
1228 }
1229
1230 /*
1231  * Set up a new inode and create an object for it on the OSD
1232  */
1233 struct inode *exofs_new_inode(struct inode *dir, int mode)
1234 {
1235         struct super_block *sb = dir->i_sb;
1236         struct exofs_sb_info *sbi = sb->s_fs_info;
1237         struct inode *inode;
1238         struct exofs_i_info *oi;
1239         struct ore_io_state *ios;
1240         int ret;
1241
1242         inode = new_inode(sb);
1243         if (!inode)
1244                 return ERR_PTR(-ENOMEM);
1245
1246         oi = exofs_i(inode);
1247         __oi_init(oi);
1248
1249         set_obj_2bcreated(oi);
1250
1251         inode->i_mapping->backing_dev_info = sb->s_bdi;
1252         inode_init_owner(inode, dir, mode);
1253         inode->i_ino = sbi->s_nextid++;
1254         inode->i_blkbits = EXOFS_BLKSHIFT;
1255         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1256         oi->i_commit_size = inode->i_size = 0;
1257         spin_lock(&sbi->s_next_gen_lock);
1258         inode->i_generation = sbi->s_next_generation++;
1259         spin_unlock(&sbi->s_next_gen_lock);
1260         insert_inode_hash(inode);
1261
1262         exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1263                          exofs_oi_objno(oi));
1264         exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
1265
1266         mark_inode_dirty(inode);
1267
1268         ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1269         if (unlikely(ret)) {
1270                 EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n");
1271                 return ERR_PTR(ret);
1272         }
1273
1274         ios->done = create_done;
1275         ios->private = inode;
1276
1277         ret = ore_create(ios);
1278         if (ret) {
1279                 ore_put_io_state(ios);
1280                 return ERR_PTR(ret);
1281         }
1282         atomic_inc(&sbi->s_curr_pending);
1283
1284         return inode;
1285 }
1286
1287 /*
1288  * struct to pass two arguments to update_inode's callback
1289  */
1290 struct updatei_args {
1291         struct exofs_sb_info    *sbi;
1292         struct exofs_fcb        fcb;
1293 };
1294
1295 /*
1296  * Callback function from exofs_update_inode().
1297  */
1298 static void updatei_done(struct ore_io_state *ios, void *p)
1299 {
1300         struct updatei_args *args = p;
1301
1302         ore_put_io_state(ios);
1303
1304         atomic_dec(&args->sbi->s_curr_pending);
1305
1306         kfree(args);
1307 }
1308
1309 /*
1310  * Write the inode to the OSD.  Just fill up the struct, and set the attribute
1311  * synchronously or asynchronously depending on the do_sync flag.
1312  */
1313 static int exofs_update_inode(struct inode *inode, int do_sync)
1314 {
1315         struct exofs_i_info *oi = exofs_i(inode);
1316         struct super_block *sb = inode->i_sb;
1317         struct exofs_sb_info *sbi = sb->s_fs_info;
1318         struct ore_io_state *ios;
1319         struct osd_attr attr;
1320         struct exofs_fcb *fcb;
1321         struct updatei_args *args;
1322         int ret;
1323
1324         args = kzalloc(sizeof(*args), GFP_KERNEL);
1325         if (!args) {
1326                 EXOFS_DBGMSG("Failed kzalloc of args\n");
1327                 return -ENOMEM;
1328         }
1329
1330         fcb = &args->fcb;
1331
1332         fcb->i_mode = cpu_to_le16(inode->i_mode);
1333         fcb->i_uid = cpu_to_le32(inode->i_uid);
1334         fcb->i_gid = cpu_to_le32(inode->i_gid);
1335         fcb->i_links_count = cpu_to_le16(inode->i_nlink);
1336         fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
1337         fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
1338         fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
1339         oi->i_commit_size = i_size_read(inode);
1340         fcb->i_size = cpu_to_le64(oi->i_commit_size);
1341         fcb->i_generation = cpu_to_le32(inode->i_generation);
1342
1343         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1344                 if (old_valid_dev(inode->i_rdev)) {
1345                         fcb->i_data[0] =
1346                                 cpu_to_le32(old_encode_dev(inode->i_rdev));
1347                         fcb->i_data[1] = 0;
1348                 } else {
1349                         fcb->i_data[0] = 0;
1350                         fcb->i_data[1] =
1351                                 cpu_to_le32(new_encode_dev(inode->i_rdev));
1352                         fcb->i_data[2] = 0;
1353                 }
1354         } else
1355                 memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
1356
1357         ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1358         if (unlikely(ret)) {
1359                 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1360                 goto free_args;
1361         }
1362
1363         attr = g_attr_inode_data;
1364         attr.val_ptr = fcb;
1365         ios->out_attr_len = 1;
1366         ios->out_attr = &attr;
1367
1368         wait_obj_created(oi);
1369
1370         if (!do_sync) {
1371                 args->sbi = sbi;
1372                 ios->done = updatei_done;
1373                 ios->private = args;
1374         }
1375
1376         ret = ore_write(ios);
1377         if (!do_sync && !ret) {
1378                 atomic_inc(&sbi->s_curr_pending);
1379                 goto out; /* deallocation in updatei_done */
1380         }
1381
1382         ore_put_io_state(ios);
1383 free_args:
1384         kfree(args);
1385 out:
1386         EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
1387                      inode->i_ino, do_sync, ret);
1388         return ret;
1389 }
1390
1391 int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
1392 {
1393         /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */
1394         return exofs_update_inode(inode, 1);
1395 }
1396
1397 /*
1398  * Callback function from exofs_delete_inode() - don't have much cleaning up to
1399  * do.
1400  */
1401 static void delete_done(struct ore_io_state *ios, void *p)
1402 {
1403         struct exofs_sb_info *sbi = p;
1404
1405         ore_put_io_state(ios);
1406
1407         atomic_dec(&sbi->s_curr_pending);
1408 }
1409
1410 /*
1411  * Called when the refcount of an inode reaches zero.  We remove the object
1412  * from the OSD here.  We make sure the object was created before we try and
1413  * delete it.
1414  */
1415 void exofs_evict_inode(struct inode *inode)
1416 {
1417         struct exofs_i_info *oi = exofs_i(inode);
1418         struct super_block *sb = inode->i_sb;
1419         struct exofs_sb_info *sbi = sb->s_fs_info;
1420         struct ore_io_state *ios;
1421         int ret;
1422
1423         truncate_inode_pages(&inode->i_data, 0);
1424
1425         /* TODO: should do better here */
1426         if (inode->i_nlink || is_bad_inode(inode))
1427                 goto no_delete;
1428
1429         inode->i_size = 0;
1430         end_writeback(inode);
1431
1432         /* if we are deleting an obj that hasn't been created yet, wait.
1433          * This also makes sure that create_done cannot be called with an
1434          * already evicted inode.
1435          */
1436         wait_obj_created(oi);
1437         /* ignore the error, attempt a remove anyway */
1438
1439         /* Now Remove the OSD objects */
1440         ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1441         if (unlikely(ret)) {
1442                 EXOFS_ERR("%s: ore_get_io_state failed\n", __func__);
1443                 return;
1444         }
1445
1446         ios->done = delete_done;
1447         ios->private = sbi;
1448
1449         ret = ore_remove(ios);
1450         if (ret) {
1451                 EXOFS_ERR("%s: ore_remove failed\n", __func__);
1452                 ore_put_io_state(ios);
1453                 return;
1454         }
1455         atomic_inc(&sbi->s_curr_pending);
1456
1457         return;
1458
1459 no_delete:
1460         end_writeback(inode);
1461 }