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