linux/fs/exofs/inode.c
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   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
  40unsigned exofs_max_io_pages(struct ore_layout *layout,
  41                            unsigned expected_pages)
  42{
  43        unsigned pages = min_t(unsigned, expected_pages,
  44                               layout->max_io_length / PAGE_SIZE);
  45
  46        return pages;
  47}
  48
  49struct page_collect {
  50        struct exofs_sb_info *sbi;
  51        struct inode *inode;
  52        unsigned expected_pages;
  53        struct ore_io_state *ios;
  54
  55        struct page **pages;
  56        unsigned alloc_pages;
  57        unsigned nr_pages;
  58        unsigned long length;
  59        loff_t pg_first; /* keep 64bit also in 32-arches */
  60        bool read_4_write; /* This means two things: that the read is sync
  61                            * And the pages should not be unlocked.
  62                            */
  63        struct page *that_locked_page;
  64};
  65
  66static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
  67                       struct inode *inode)
  68{
  69        struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
  70
  71        pcol->sbi = sbi;
  72        pcol->inode = inode;
  73        pcol->expected_pages = expected_pages;
  74
  75        pcol->ios = NULL;
  76        pcol->pages = NULL;
  77        pcol->alloc_pages = 0;
  78        pcol->nr_pages = 0;
  79        pcol->length = 0;
  80        pcol->pg_first = -1;
  81        pcol->read_4_write = false;
  82        pcol->that_locked_page = NULL;
  83}
  84
  85static void _pcol_reset(struct page_collect *pcol)
  86{
  87        pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
  88
  89        pcol->pages = NULL;
  90        pcol->alloc_pages = 0;
  91        pcol->nr_pages = 0;
  92        pcol->length = 0;
  93        pcol->pg_first = -1;
  94        pcol->ios = NULL;
  95        pcol->that_locked_page = NULL;
  96
  97        /* this is probably the end of the loop but in writes
  98         * it might not end here. don't be left with nothing
  99         */
 100        if (!pcol->expected_pages)
 101                pcol->expected_pages =
 102                                exofs_max_io_pages(&pcol->sbi->layout, ~0);
 103}
 104
 105static int pcol_try_alloc(struct page_collect *pcol)
 106{
 107        unsigned pages;
 108
 109        /* TODO: easily support bio chaining */
 110        pages =  exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages);
 111
 112        for (; pages; pages >>= 1) {
 113                pcol->pages = kmalloc(pages * sizeof(struct page *),
 114                                      GFP_KERNEL);
 115                if (likely(pcol->pages)) {
 116                        pcol->alloc_pages = pages;
 117                        return 0;
 118                }
 119        }
 120
 121        EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
 122                  pcol->expected_pages);
 123        return -ENOMEM;
 124}
 125
 126static void pcol_free(struct page_collect *pcol)
 127{
 128        kfree(pcol->pages);
 129        pcol->pages = NULL;
 130
 131        if (pcol->ios) {
 132                ore_put_io_state(pcol->ios);
 133                pcol->ios = NULL;
 134        }
 135}
 136
 137static int pcol_add_page(struct page_collect *pcol, struct page *page,
 138                         unsigned len)
 139{
 140        if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
 141                return -ENOMEM;
 142
 143        pcol->pages[pcol->nr_pages++] = page;
 144        pcol->length += len;
 145        return 0;
 146}
 147
 148enum {PAGE_WAS_NOT_IN_IO = 17};
 149static int update_read_page(struct page *page, int ret)
 150{
 151        switch (ret) {
 152        case 0:
 153                /* Everything is OK */
 154                SetPageUptodate(page);
 155                if (PageError(page))
 156                        ClearPageError(page);
 157                break;
 158        case -EFAULT:
 159                /* In this case we were trying to read something that wasn't on
 160                 * disk yet - return a page full of zeroes.  This should be OK,
 161                 * because the object should be empty (if there was a write
 162                 * before this read, the read would be waiting with the page
 163                 * locked */
 164                clear_highpage(page);
 165
 166                SetPageUptodate(page);
 167                if (PageError(page))
 168                        ClearPageError(page);
 169                EXOFS_DBGMSG("recovered read error\n");
 170                /* fall through */
 171        case PAGE_WAS_NOT_IN_IO:
 172                ret = 0; /* recovered error */
 173                break;
 174        default:
 175                SetPageError(page);
 176        }
 177        return ret;
 178}
 179
 180static void update_write_page(struct page *page, int ret)
 181{
 182        if (unlikely(ret == PAGE_WAS_NOT_IN_IO))
 183                return; /* don't pass start don't collect $200 */
 184
 185        if (ret) {
 186                mapping_set_error(page->mapping, ret);
 187                SetPageError(page);
 188        }
 189        end_page_writeback(page);
 190}
 191
 192/* Called at the end of reads, to optionally unlock pages and update their
 193 * status.
 194 */
 195static int __readpages_done(struct page_collect *pcol)
 196{
 197        int i;
 198        u64 good_bytes;
 199        u64 length = 0;
 200        int ret = ore_check_io(pcol->ios, NULL);
 201
 202        if (likely(!ret)) {
 203                good_bytes = pcol->length;
 204                ret = PAGE_WAS_NOT_IN_IO;
 205        } else {
 206                good_bytes = 0;
 207        }
 208
 209        EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
 210                     " length=0x%lx nr_pages=%u\n",
 211                     pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
 212                     pcol->nr_pages);
 213
 214        for (i = 0; i < pcol->nr_pages; i++) {
 215                struct page *page = pcol->pages[i];
 216                struct inode *inode = page->mapping->host;
 217                int page_stat;
 218
 219                if (inode != pcol->inode)
 220                        continue; /* osd might add more pages at end */
 221
 222                if (likely(length < good_bytes))
 223                        page_stat = 0;
 224                else
 225                        page_stat = ret;
 226
 227                EXOFS_DBGMSG2("    readpages_done(0x%lx, 0x%lx) %s\n",
 228                          inode->i_ino, page->index,
 229                          page_stat ? "bad_bytes" : "good_bytes");
 230
 231                ret = update_read_page(page, page_stat);
 232                if (!pcol->read_4_write)
 233                        unlock_page(page);
 234                length += PAGE_SIZE;
 235        }
 236
 237        pcol_free(pcol);
 238        EXOFS_DBGMSG2("readpages_done END\n");
 239        return ret;
 240}
 241
 242/* callback of async reads */
 243static void readpages_done(struct ore_io_state *ios, void *p)
 244{
 245        struct page_collect *pcol = p;
 246
 247        __readpages_done(pcol);
 248        atomic_dec(&pcol->sbi->s_curr_pending);
 249        kfree(pcol);
 250}
 251
 252static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
 253{
 254        int i;
 255
 256        for (i = 0; i < pcol->nr_pages; i++) {
 257                struct page *page = pcol->pages[i];
 258
 259                if (rw == READ)
 260                        update_read_page(page, ret);
 261                else
 262                        update_write_page(page, ret);
 263
 264                unlock_page(page);
 265        }
 266}
 267
 268static int _maybe_not_all_in_one_io(struct ore_io_state *ios,
 269        struct page_collect *pcol_src, struct page_collect *pcol)
 270{
 271        /* length was wrong or offset was not page aligned */
 272        BUG_ON(pcol_src->nr_pages < ios->nr_pages);
 273
 274        if (pcol_src->nr_pages > ios->nr_pages) {
 275                struct page **src_page;
 276                unsigned pages_less = pcol_src->nr_pages - ios->nr_pages;
 277                unsigned long len_less = pcol_src->length - ios->length;
 278                unsigned i;
 279                int ret;
 280
 281                /* This IO was trimmed */
 282                pcol_src->nr_pages = ios->nr_pages;
 283                pcol_src->length = ios->length;
 284
 285                /* Left over pages are passed to the next io */
 286                pcol->expected_pages += pages_less;
 287                pcol->nr_pages = pages_less;
 288                pcol->length = len_less;
 289                src_page = pcol_src->pages + pcol_src->nr_pages;
 290                pcol->pg_first = (*src_page)->index;
 291
 292                ret = pcol_try_alloc(pcol);
 293                if (unlikely(ret))
 294                        return ret;
 295
 296                for (i = 0; i < pages_less; ++i)
 297                        pcol->pages[i] = *src_page++;
 298
 299                EXOFS_DBGMSG("Length was adjusted nr_pages=0x%x "
 300                        "pages_less=0x%x expected_pages=0x%x "
 301                        "next_offset=0x%llx next_len=0x%lx\n",
 302                        pcol_src->nr_pages, pages_less, pcol->expected_pages,
 303                        pcol->pg_first * PAGE_SIZE, pcol->length);
 304        }
 305        return 0;
 306}
 307
 308static int read_exec(struct page_collect *pcol)
 309{
 310        struct exofs_i_info *oi = exofs_i(pcol->inode);
 311        struct ore_io_state *ios;
 312        struct page_collect *pcol_copy = NULL;
 313        int ret;
 314
 315        if (!pcol->pages)
 316                return 0;
 317
 318        if (!pcol->ios) {
 319                int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true,
 320                                             pcol->pg_first << PAGE_CACHE_SHIFT,
 321                                             pcol->length, &pcol->ios);
 322
 323                if (ret)
 324                        return ret;
 325        }
 326
 327        ios = pcol->ios;
 328        ios->pages = pcol->pages;
 329
 330        if (pcol->read_4_write) {
 331                ore_read(pcol->ios);
 332                return __readpages_done(pcol);
 333        }
 334
 335        pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
 336        if (!pcol_copy) {
 337                ret = -ENOMEM;
 338                goto err;
 339        }
 340
 341        *pcol_copy = *pcol;
 342        ios->done = readpages_done;
 343        ios->private = pcol_copy;
 344
 345        /* pages ownership was passed to pcol_copy */
 346        _pcol_reset(pcol);
 347
 348        ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
 349        if (unlikely(ret))
 350                goto err;
 351
 352        EXOFS_DBGMSG2("read_exec(0x%lx) offset=0x%llx length=0x%llx\n",
 353                pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
 354
 355        ret = ore_read(ios);
 356        if (unlikely(ret))
 357                goto err;
 358
 359        atomic_inc(&pcol->sbi->s_curr_pending);
 360
 361        return 0;
 362
 363err:
 364        if (!pcol_copy) /* Failed before ownership transfer */
 365                pcol_copy = pcol;
 366        _unlock_pcol_pages(pcol_copy, ret, READ);
 367        pcol_free(pcol_copy);
 368        kfree(pcol_copy);
 369
 370        return ret;
 371}
 372
 373/* readpage_strip is called either directly from readpage() or by the VFS from
 374 * within read_cache_pages(), to add one more page to be read. It will try to
 375 * collect as many contiguous pages as posible. If a discontinuity is
 376 * encountered, or it runs out of resources, it will submit the previous segment
 377 * and will start a new collection. Eventually caller must submit the last
 378 * segment if present.
 379 */
 380static int readpage_strip(void *data, struct page *page)
 381{
 382        struct page_collect *pcol = data;
 383        struct inode *inode = pcol->inode;
 384        struct exofs_i_info *oi = exofs_i(inode);
 385        loff_t i_size = i_size_read(inode);
 386        pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 387        size_t len;
 388        int ret;
 389
 390        BUG_ON(!PageLocked(page));
 391
 392        /* FIXME: Just for debugging, will be removed */
 393        if (PageUptodate(page))
 394                EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
 395                          page->index);
 396
 397        pcol->that_locked_page = page;
 398
 399        if (page->index < end_index)
 400                len = PAGE_CACHE_SIZE;
 401        else if (page->index == end_index)
 402                len = i_size & ~PAGE_CACHE_MASK;
 403        else
 404                len = 0;
 405
 406        if (!len || !obj_created(oi)) {
 407                /* this will be out of bounds, or doesn't exist yet.
 408                 * Current page is cleared and the request is split
 409                 */
 410                clear_highpage(page);
 411
 412                SetPageUptodate(page);
 413                if (PageError(page))
 414                        ClearPageError(page);
 415
 416                if (!pcol->read_4_write)
 417                        unlock_page(page);
 418                EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx "
 419                             "read_4_write=%d index=0x%lx end_index=0x%lx "
 420                             "splitting\n", inode->i_ino, len,
 421                             pcol->read_4_write, page->index, end_index);
 422
 423                return read_exec(pcol);
 424        }
 425
 426try_again:
 427
 428        if (unlikely(pcol->pg_first == -1)) {
 429                pcol->pg_first = page->index;
 430        } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
 431                   page->index)) {
 432                /* Discontinuity detected, split the request */
 433                ret = read_exec(pcol);
 434                if (unlikely(ret))
 435                        goto fail;
 436                goto try_again;
 437        }
 438
 439        if (!pcol->pages) {
 440                ret = pcol_try_alloc(pcol);
 441                if (unlikely(ret))
 442                        goto fail;
 443        }
 444
 445        if (len != PAGE_CACHE_SIZE)
 446                zero_user(page, len, PAGE_CACHE_SIZE - len);
 447
 448        EXOFS_DBGMSG2("    readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
 449                     inode->i_ino, page->index, len);
 450
 451        ret = pcol_add_page(pcol, page, len);
 452        if (ret) {
 453                EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
 454                          "this_len=0x%zx nr_pages=%u length=0x%lx\n",
 455                          page, len, pcol->nr_pages, pcol->length);
 456
 457                /* split the request, and start again with current page */
 458                ret = read_exec(pcol);
 459                if (unlikely(ret))
 460                        goto fail;
 461
 462                goto try_again;
 463        }
 464
 465        return 0;
 466
 467fail:
 468        /* SetPageError(page); ??? */
 469        unlock_page(page);
 470        return ret;
 471}
 472
 473static int exofs_readpages(struct file *file, struct address_space *mapping,
 474                           struct list_head *pages, unsigned nr_pages)
 475{
 476        struct page_collect pcol;
 477        int ret;
 478
 479        _pcol_init(&pcol, nr_pages, mapping->host);
 480
 481        ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
 482        if (ret) {
 483                EXOFS_ERR("read_cache_pages => %d\n", ret);
 484                return ret;
 485        }
 486
 487        ret = read_exec(&pcol);
 488        if (unlikely(ret))
 489                return ret;
 490
 491        return read_exec(&pcol);
 492}
 493
 494static int _readpage(struct page *page, bool read_4_write)
 495{
 496        struct page_collect pcol;
 497        int ret;
 498
 499        _pcol_init(&pcol, 1, page->mapping->host);
 500
 501        pcol.read_4_write = read_4_write;
 502        ret = readpage_strip(&pcol, page);
 503        if (ret) {
 504                EXOFS_ERR("_readpage => %d\n", ret);
 505                return ret;
 506        }
 507
 508        return read_exec(&pcol);
 509}
 510
 511/*
 512 * We don't need the file
 513 */
 514static int exofs_readpage(struct file *file, struct page *page)
 515{
 516        return _readpage(page, false);
 517}
 518
 519/* Callback for osd_write. All writes are asynchronous */
 520static void writepages_done(struct ore_io_state *ios, void *p)
 521{
 522        struct page_collect *pcol = p;
 523        int i;
 524        u64  good_bytes;
 525        u64  length = 0;
 526        int ret = ore_check_io(ios, NULL);
 527
 528        atomic_dec(&pcol->sbi->s_curr_pending);
 529
 530        if (likely(!ret)) {
 531                good_bytes = pcol->length;
 532                ret = PAGE_WAS_NOT_IN_IO;
 533        } else {
 534                good_bytes = 0;
 535        }
 536
 537        EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
 538                     " length=0x%lx nr_pages=%u\n",
 539                     pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
 540                     pcol->nr_pages);
 541
 542        for (i = 0; i < pcol->nr_pages; i++) {
 543                struct page *page = pcol->pages[i];
 544                struct inode *inode = page->mapping->host;
 545                int page_stat;
 546
 547                if (inode != pcol->inode)
 548                        continue; /* osd might add more pages to a bio */
 549
 550                if (likely(length < good_bytes))
 551                        page_stat = 0;
 552                else
 553                        page_stat = ret;
 554
 555                update_write_page(page, page_stat);
 556                unlock_page(page);
 557                EXOFS_DBGMSG2("    writepages_done(0x%lx, 0x%lx) status=%d\n",
 558                             inode->i_ino, page->index, page_stat);
 559
 560                length += PAGE_SIZE;
 561        }
 562
 563        pcol_free(pcol);
 564        kfree(pcol);
 565        EXOFS_DBGMSG2("writepages_done END\n");
 566}
 567
 568static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate)
 569{
 570        struct page_collect *pcol = priv;
 571        pgoff_t index = offset / PAGE_SIZE;
 572
 573        if (!pcol->that_locked_page ||
 574            (pcol->that_locked_page->index != index)) {
 575                struct page *page;
 576                loff_t i_size = i_size_read(pcol->inode);
 577
 578                if (offset >= i_size) {
 579                        *uptodate = true;
 580                        EXOFS_DBGMSG("offset >= i_size index=0x%lx\n", index);
 581                        return ZERO_PAGE(0);
 582                }
 583
 584                page =  find_get_page(pcol->inode->i_mapping, index);
 585                if (!page) {
 586                        page = find_or_create_page(pcol->inode->i_mapping,
 587                                                   index, GFP_NOFS);
 588                        if (unlikely(!page)) {
 589                                EXOFS_DBGMSG("grab_cache_page Failed "
 590                                        "index=0x%llx\n", _LLU(index));
 591                                return NULL;
 592                        }
 593                        unlock_page(page);
 594                }
 595                if (PageDirty(page) || PageWriteback(page))
 596                        *uptodate = true;
 597                else
 598                        *uptodate = PageUptodate(page);
 599                EXOFS_DBGMSG("index=0x%lx uptodate=%d\n", index, *uptodate);
 600                return page;
 601        } else {
 602                EXOFS_DBGMSG("YES that_locked_page index=0x%lx\n",
 603                             pcol->that_locked_page->index);
 604                *uptodate = true;
 605                return pcol->that_locked_page;
 606        }
 607}
 608
 609static void __r4w_put_page(void *priv, struct page *page)
 610{
 611        struct page_collect *pcol = priv;
 612
 613        if ((pcol->that_locked_page != page) && (ZERO_PAGE(0) != page)) {
 614                EXOFS_DBGMSG("index=0x%lx\n", page->index);
 615                page_cache_release(page);
 616                return;
 617        }
 618        EXOFS_DBGMSG("that_locked_page index=0x%lx\n",
 619                     ZERO_PAGE(0) == page ? -1 : page->index);
 620}
 621
 622static const struct _ore_r4w_op _r4w_op = {
 623        .get_page = &__r4w_get_page,
 624        .put_page = &__r4w_put_page,
 625};
 626
 627static int write_exec(struct page_collect *pcol)
 628{
 629        struct exofs_i_info *oi = exofs_i(pcol->inode);
 630        struct ore_io_state *ios;
 631        struct page_collect *pcol_copy = NULL;
 632        int ret;
 633
 634        if (!pcol->pages)
 635                return 0;
 636
 637        BUG_ON(pcol->ios);
 638        ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false,
 639                                 pcol->pg_first << PAGE_CACHE_SHIFT,
 640                                 pcol->length, &pcol->ios);
 641        if (unlikely(ret))
 642                goto err;
 643
 644        pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
 645        if (!pcol_copy) {
 646                EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
 647                ret = -ENOMEM;
 648                goto err;
 649        }
 650
 651        *pcol_copy = *pcol;
 652
 653        ios = pcol->ios;
 654        ios->pages = pcol_copy->pages;
 655        ios->done = writepages_done;
 656        ios->r4w = &_r4w_op;
 657        ios->private = pcol_copy;
 658
 659        /* pages ownership was passed to pcol_copy */
 660        _pcol_reset(pcol);
 661
 662        ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
 663        if (unlikely(ret))
 664                goto err;
 665
 666        EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n",
 667                pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
 668
 669        ret = ore_write(ios);
 670        if (unlikely(ret)) {
 671                EXOFS_ERR("write_exec: ore_write() Failed\n");
 672                goto err;
 673        }
 674
 675        atomic_inc(&pcol->sbi->s_curr_pending);
 676        return 0;
 677
 678err:
 679        if (!pcol_copy) /* Failed before ownership transfer */
 680                pcol_copy = pcol;
 681        _unlock_pcol_pages(pcol_copy, ret, WRITE);
 682        pcol_free(pcol_copy);
 683        kfree(pcol_copy);
 684
 685        return ret;
 686}
 687
 688/* writepage_strip is called either directly from writepage() or by the VFS from
 689 * within write_cache_pages(), to add one more page to be written to storage.
 690 * It will try to collect as many contiguous pages as possible. If a
 691 * discontinuity is encountered or it runs out of resources it will submit the
 692 * previous segment and will start a new collection.
 693 * Eventually caller must submit the last segment if present.
 694 */
 695static int writepage_strip(struct page *page,
 696                           struct writeback_control *wbc_unused, void *data)
 697{
 698        struct page_collect *pcol = data;
 699        struct inode *inode = pcol->inode;
 700        struct exofs_i_info *oi = exofs_i(inode);
 701        loff_t i_size = i_size_read(inode);
 702        pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 703        size_t len;
 704        int ret;
 705
 706        BUG_ON(!PageLocked(page));
 707
 708        ret = wait_obj_created(oi);
 709        if (unlikely(ret))
 710                goto fail;
 711
 712        if (page->index < end_index)
 713                /* in this case, the page is within the limits of the file */
 714                len = PAGE_CACHE_SIZE;
 715        else {
 716                len = i_size & ~PAGE_CACHE_MASK;
 717
 718                if (page->index > end_index || !len) {
 719                        /* in this case, the page is outside the limits
 720                         * (truncate in progress)
 721                         */
 722                        ret = write_exec(pcol);
 723                        if (unlikely(ret))
 724                                goto fail;
 725                        if (PageError(page))
 726                                ClearPageError(page);
 727                        unlock_page(page);
 728                        EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
 729                                     "outside the limits\n",
 730                                     inode->i_ino, page->index);
 731                        return 0;
 732                }
 733        }
 734
 735try_again:
 736
 737        if (unlikely(pcol->pg_first == -1)) {
 738                pcol->pg_first = page->index;
 739        } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
 740                   page->index)) {
 741                /* Discontinuity detected, split the request */
 742                ret = write_exec(pcol);
 743                if (unlikely(ret))
 744                        goto fail;
 745
 746                EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
 747                             inode->i_ino, page->index);
 748                goto try_again;
 749        }
 750
 751        if (!pcol->pages) {
 752                ret = pcol_try_alloc(pcol);
 753                if (unlikely(ret))
 754                        goto fail;
 755        }
 756
 757        EXOFS_DBGMSG2("    writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
 758                     inode->i_ino, page->index, len);
 759
 760        ret = pcol_add_page(pcol, page, len);
 761        if (unlikely(ret)) {
 762                EXOFS_DBGMSG2("Failed pcol_add_page "
 763                             "nr_pages=%u total_length=0x%lx\n",
 764                             pcol->nr_pages, pcol->length);
 765
 766                /* split the request, next loop will start again */
 767                ret = write_exec(pcol);
 768                if (unlikely(ret)) {
 769                        EXOFS_DBGMSG("write_exec failed => %d", ret);
 770                        goto fail;
 771                }
 772
 773                goto try_again;
 774        }
 775
 776        BUG_ON(PageWriteback(page));
 777        set_page_writeback(page);
 778
 779        return 0;
 780
 781fail:
 782        EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
 783                     inode->i_ino, page->index, ret);
 784        set_bit(AS_EIO, &page->mapping->flags);
 785        unlock_page(page);
 786        return ret;
 787}
 788
 789static int exofs_writepages(struct address_space *mapping,
 790                       struct writeback_control *wbc)
 791{
 792        struct page_collect pcol;
 793        long start, end, expected_pages;
 794        int ret;
 795
 796        start = wbc->range_start >> PAGE_CACHE_SHIFT;
 797        end = (wbc->range_end == LLONG_MAX) ?
 798                        start + mapping->nrpages :
 799                        wbc->range_end >> PAGE_CACHE_SHIFT;
 800
 801        if (start || end)
 802                expected_pages = end - start + 1;
 803        else
 804                expected_pages = mapping->nrpages;
 805
 806        if (expected_pages < 32L)
 807                expected_pages = 32L;
 808
 809        EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
 810                     "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
 811                     mapping->host->i_ino, wbc->range_start, wbc->range_end,
 812                     mapping->nrpages, start, end, expected_pages);
 813
 814        _pcol_init(&pcol, expected_pages, mapping->host);
 815
 816        ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
 817        if (unlikely(ret)) {
 818                EXOFS_ERR("write_cache_pages => %d\n", ret);
 819                return ret;
 820        }
 821
 822        ret = write_exec(&pcol);
 823        if (unlikely(ret))
 824                return ret;
 825
 826        if (wbc->sync_mode == WB_SYNC_ALL) {
 827                return write_exec(&pcol); /* pump the last reminder */
 828        } else if (pcol.nr_pages) {
 829                /* not SYNC let the reminder join the next writeout */
 830                unsigned i;
 831
 832                for (i = 0; i < pcol.nr_pages; i++) {
 833                        struct page *page = pcol.pages[i];
 834
 835                        end_page_writeback(page);
 836                        set_page_dirty(page);
 837                        unlock_page(page);
 838                }
 839        }
 840        return 0;
 841}
 842
 843/*
 844static int exofs_writepage(struct page *page, struct writeback_control *wbc)
 845{
 846        struct page_collect pcol;
 847        int ret;
 848
 849        _pcol_init(&pcol, 1, page->mapping->host);
 850
 851        ret = writepage_strip(page, NULL, &pcol);
 852        if (ret) {
 853                EXOFS_ERR("exofs_writepage => %d\n", ret);
 854                return ret;
 855        }
 856
 857        return write_exec(&pcol);
 858}
 859*/
 860/* i_mutex held using inode->i_size directly */
 861static void _write_failed(struct inode *inode, loff_t to)
 862{
 863        if (to > inode->i_size)
 864                truncate_pagecache(inode, to, inode->i_size);
 865}
 866
 867int exofs_write_begin(struct file *file, struct address_space *mapping,
 868                loff_t pos, unsigned len, unsigned flags,
 869                struct page **pagep, void **fsdata)
 870{
 871        int ret = 0;
 872        struct page *page;
 873
 874        page = *pagep;
 875        if (page == NULL) {
 876                ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
 877                                         fsdata);
 878                if (ret) {
 879                        EXOFS_DBGMSG("simple_write_begin failed\n");
 880                        goto out;
 881                }
 882
 883                page = *pagep;
 884        }
 885
 886         /* read modify write */
 887        if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
 888                loff_t i_size = i_size_read(mapping->host);
 889                pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 890                size_t rlen;
 891
 892                if (page->index < end_index)
 893                        rlen = PAGE_CACHE_SIZE;
 894                else if (page->index == end_index)
 895                        rlen = i_size & ~PAGE_CACHE_MASK;
 896                else
 897                        rlen = 0;
 898
 899                if (!rlen) {
 900                        clear_highpage(page);
 901                        SetPageUptodate(page);
 902                        goto out;
 903                }
 904
 905                ret = _readpage(page, true);
 906                if (ret) {
 907                        /*SetPageError was done by _readpage. Is it ok?*/
 908                        unlock_page(page);
 909                        EXOFS_DBGMSG("__readpage failed\n");
 910                }
 911        }
 912out:
 913        if (unlikely(ret))
 914                _write_failed(mapping->host, pos + len);
 915
 916        return ret;
 917}
 918
 919static int exofs_write_begin_export(struct file *file,
 920                struct address_space *mapping,
 921                loff_t pos, unsigned len, unsigned flags,
 922                struct page **pagep, void **fsdata)
 923{
 924        *pagep = NULL;
 925
 926        return exofs_write_begin(file, mapping, pos, len, flags, pagep,
 927                                        fsdata);
 928}
 929
 930static int exofs_write_end(struct file *file, struct address_space *mapping,
 931                        loff_t pos, unsigned len, unsigned copied,
 932                        struct page *page, void *fsdata)
 933{
 934        struct inode *inode = mapping->host;
 935        /* According to comment in simple_write_end i_mutex is held */
 936        loff_t i_size = inode->i_size;
 937        int ret;
 938
 939        ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
 940        if (unlikely(ret))
 941                _write_failed(inode, pos + len);
 942
 943        /* TODO: once simple_write_end marks inode dirty remove */
 944        if (i_size != inode->i_size)
 945                mark_inode_dirty(inode);
 946        return ret;
 947}
 948
 949static int exofs_releasepage(struct page *page, gfp_t gfp)
 950{
 951        EXOFS_DBGMSG("page 0x%lx\n", page->index);
 952        WARN_ON(1);
 953        return 0;
 954}
 955
 956static void exofs_invalidatepage(struct page *page, unsigned int offset,
 957                                 unsigned int length)
 958{
 959        EXOFS_DBGMSG("page 0x%lx offset 0x%x length 0x%x\n",
 960                     page->index, offset, length);
 961        WARN_ON(1);
 962}
 963
 964const struct address_space_operations exofs_aops = {
 965        .readpage       = exofs_readpage,
 966        .readpages      = exofs_readpages,
 967        .writepage      = NULL,
 968        .writepages     = exofs_writepages,
 969        .write_begin    = exofs_write_begin_export,
 970        .write_end      = exofs_write_end,
 971        .releasepage    = exofs_releasepage,
 972        .set_page_dirty = __set_page_dirty_nobuffers,
 973        .invalidatepage = exofs_invalidatepage,
 974
 975        /* Not implemented Yet */
 976        .bmap           = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
 977        .direct_IO      = NULL, /* TODO: Should be trivial to do */
 978
 979        /* With these NULL has special meaning or default is not exported */
 980        .get_xip_mem    = NULL,
 981        .migratepage    = NULL,
 982        .launder_page   = NULL,
 983        .is_partially_uptodate = NULL,
 984        .error_remove_page = NULL,
 985};
 986
 987/******************************************************************************
 988 * INODE OPERATIONS
 989 *****************************************************************************/
 990
 991/*
 992 * Test whether an inode is a fast symlink.
 993 */
 994static inline int exofs_inode_is_fast_symlink(struct inode *inode)
 995{
 996        struct exofs_i_info *oi = exofs_i(inode);
 997
 998        return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
 999}
1000
1001static int _do_truncate(struct inode *inode, loff_t newsize)
1002{
1003        struct exofs_i_info *oi = exofs_i(inode);
1004        struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1005        int ret;
1006
1007        inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1008
1009        ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize);
1010        if (likely(!ret))
1011                truncate_setsize(inode, newsize);
1012
1013        EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n",
1014                     inode->i_ino, newsize, ret);
1015        return ret;
1016}
1017
1018/*
1019 * Set inode attributes - update size attribute on OSD if needed,
1020 *                        otherwise just call generic functions.
1021 */
1022int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
1023{
1024        struct inode *inode = dentry->d_inode;
1025        int error;
1026
1027        /* if we are about to modify an object, and it hasn't been
1028         * created yet, wait
1029         */
1030        error = wait_obj_created(exofs_i(inode));
1031        if (unlikely(error))
1032                return error;
1033
1034        error = inode_change_ok(inode, iattr);
1035        if (unlikely(error))
1036                return error;
1037
1038        if ((iattr->ia_valid & ATTR_SIZE) &&
1039            iattr->ia_size != i_size_read(inode)) {
1040                error = _do_truncate(inode, iattr->ia_size);
1041                if (unlikely(error))
1042                        return error;
1043        }
1044
1045        setattr_copy(inode, iattr);
1046        mark_inode_dirty(inode);
1047        return 0;
1048}
1049
1050static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
1051        EXOFS_APAGE_FS_DATA,
1052        EXOFS_ATTR_INODE_FILE_LAYOUT,
1053        0);
1054static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
1055        EXOFS_APAGE_FS_DATA,
1056        EXOFS_ATTR_INODE_DIR_LAYOUT,
1057        0);
1058
1059/*
1060 * Read the Linux inode info from the OSD, and return it as is. In exofs the
1061 * inode info is in an application specific page/attribute of the osd-object.
1062 */
1063static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
1064                    struct exofs_fcb *inode)
1065{
1066        struct exofs_sb_info *sbi = sb->s_fs_info;
1067        struct osd_attr attrs[] = {
1068                [0] = g_attr_inode_data,
1069                [1] = g_attr_inode_file_layout,
1070                [2] = g_attr_inode_dir_layout,
1071        };
1072        struct ore_io_state *ios;
1073        struct exofs_on_disk_inode_layout *layout;
1074        int ret;
1075
1076        ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1077        if (unlikely(ret)) {
1078                EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1079                return ret;
1080        }
1081
1082        attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1083        attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1084
1085        ios->in_attr = attrs;
1086        ios->in_attr_len = ARRAY_SIZE(attrs);
1087
1088        ret = ore_read(ios);
1089        if (unlikely(ret)) {
1090                EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
1091                          _LLU(oi->one_comp.obj.id), ret);
1092                memset(inode, 0, sizeof(*inode));
1093                inode->i_mode = 0040000 | (0777 & ~022);
1094                /* If object is lost on target we might as well enable it's
1095                 * delete.
1096                 */
1097                if ((ret == -ENOENT) || (ret == -EINVAL))
1098                        ret = 0;
1099                goto out;
1100        }
1101
1102        ret = extract_attr_from_ios(ios, &attrs[0]);
1103        if (ret) {
1104                EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1105                goto out;
1106        }
1107        WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
1108        memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
1109
1110        ret = extract_attr_from_ios(ios, &attrs[1]);
1111        if (ret) {
1112                EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1113                goto out;
1114        }
1115        if (attrs[1].len) {
1116                layout = attrs[1].val_ptr;
1117                if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1118                        EXOFS_ERR("%s: unsupported files layout %d\n",
1119                                __func__, layout->gen_func);
1120                        ret = -ENOTSUPP;
1121                        goto out;
1122                }
1123        }
1124
1125        ret = extract_attr_from_ios(ios, &attrs[2]);
1126        if (ret) {
1127                EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1128                goto out;
1129        }
1130        if (attrs[2].len) {
1131                layout = attrs[2].val_ptr;
1132                if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1133                        EXOFS_ERR("%s: unsupported meta-data layout %d\n",
1134                                __func__, layout->gen_func);
1135                        ret = -ENOTSUPP;
1136                        goto out;
1137                }
1138        }
1139
1140out:
1141        ore_put_io_state(ios);
1142        return ret;
1143}
1144
1145static void __oi_init(struct exofs_i_info *oi)
1146{
1147        init_waitqueue_head(&oi->i_wq);
1148        oi->i_flags = 0;
1149}
1150/*
1151 * Fill in an inode read from the OSD and set it up for use
1152 */
1153struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
1154{
1155        struct exofs_i_info *oi;
1156        struct exofs_fcb fcb;
1157        struct inode *inode;
1158        int ret;
1159
1160        inode = iget_locked(sb, ino);
1161        if (!inode)
1162                return ERR_PTR(-ENOMEM);
1163        if (!(inode->i_state & I_NEW))
1164                return inode;
1165        oi = exofs_i(inode);
1166        __oi_init(oi);
1167        exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1168                         exofs_oi_objno(oi));
1169
1170        /* read the inode from the osd */
1171        ret = exofs_get_inode(sb, oi, &fcb);
1172        if (ret)
1173                goto bad_inode;
1174
1175        set_obj_created(oi);
1176
1177        /* copy stuff from on-disk struct to in-memory struct */
1178        inode->i_mode = le16_to_cpu(fcb.i_mode);
1179        i_uid_write(inode, le32_to_cpu(fcb.i_uid));
1180        i_gid_write(inode, le32_to_cpu(fcb.i_gid));
1181        set_nlink(inode, le16_to_cpu(fcb.i_links_count));
1182        inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
1183        inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
1184        inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
1185        inode->i_ctime.tv_nsec =
1186                inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
1187        oi->i_commit_size = le64_to_cpu(fcb.i_size);
1188        i_size_write(inode, oi->i_commit_size);
1189        inode->i_blkbits = EXOFS_BLKSHIFT;
1190        inode->i_generation = le32_to_cpu(fcb.i_generation);
1191
1192        oi->i_dir_start_lookup = 0;
1193
1194        if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
1195                ret = -ESTALE;
1196                goto bad_inode;
1197        }
1198
1199        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1200                if (fcb.i_data[0])
1201                        inode->i_rdev =
1202                                old_decode_dev(le32_to_cpu(fcb.i_data[0]));
1203                else
1204                        inode->i_rdev =
1205                                new_decode_dev(le32_to_cpu(fcb.i_data[1]));
1206        } else {
1207                memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
1208        }
1209
1210        inode->i_mapping->backing_dev_info = sb->s_bdi;
1211        if (S_ISREG(inode->i_mode)) {
1212                inode->i_op = &exofs_file_inode_operations;
1213                inode->i_fop = &exofs_file_operations;
1214                inode->i_mapping->a_ops = &exofs_aops;
1215        } else if (S_ISDIR(inode->i_mode)) {
1216                inode->i_op = &exofs_dir_inode_operations;
1217                inode->i_fop = &exofs_dir_operations;
1218                inode->i_mapping->a_ops = &exofs_aops;
1219        } else if (S_ISLNK(inode->i_mode)) {
1220                if (exofs_inode_is_fast_symlink(inode))
1221                        inode->i_op = &exofs_fast_symlink_inode_operations;
1222                else {
1223                        inode->i_op = &exofs_symlink_inode_operations;
1224                        inode->i_mapping->a_ops = &exofs_aops;
1225                }
1226        } else {
1227                inode->i_op = &exofs_special_inode_operations;
1228                if (fcb.i_data[0])
1229                        init_special_inode(inode, inode->i_mode,
1230                           old_decode_dev(le32_to_cpu(fcb.i_data[0])));
1231                else
1232                        init_special_inode(inode, inode->i_mode,
1233                           new_decode_dev(le32_to_cpu(fcb.i_data[1])));
1234        }
1235
1236        unlock_new_inode(inode);
1237        return inode;
1238
1239bad_inode:
1240        iget_failed(inode);
1241        return ERR_PTR(ret);
1242}
1243
1244int __exofs_wait_obj_created(struct exofs_i_info *oi)
1245{
1246        if (!obj_created(oi)) {
1247                EXOFS_DBGMSG("!obj_created\n");
1248                BUG_ON(!obj_2bcreated(oi));
1249                wait_event(oi->i_wq, obj_created(oi));
1250                EXOFS_DBGMSG("wait_event done\n");
1251        }
1252        return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
1253}
1254
1255/*
1256 * Callback function from exofs_new_inode().  The important thing is that we
1257 * set the obj_created flag so that other methods know that the object exists on
1258 * the OSD.
1259 */
1260static void create_done(struct ore_io_state *ios, void *p)
1261{
1262        struct inode *inode = p;
1263        struct exofs_i_info *oi = exofs_i(inode);
1264        struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1265        int ret;
1266
1267        ret = ore_check_io(ios, NULL);
1268        ore_put_io_state(ios);
1269
1270        atomic_dec(&sbi->s_curr_pending);
1271
1272        if (unlikely(ret)) {
1273                EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx",
1274                          _LLU(exofs_oi_objno(oi)),
1275                          _LLU(oi->one_comp.obj.partition));
1276                /*TODO: When FS is corrupted creation can fail, object already
1277                 * exist. Get rid of this asynchronous creation, if exist
1278                 * increment the obj counter and try the next object. Until we
1279                 * succeed. All these dangling objects will be made into lost
1280                 * files by chkfs.exofs
1281                 */
1282        }
1283
1284        set_obj_created(oi);
1285
1286        wake_up(&oi->i_wq);
1287}
1288
1289/*
1290 * Set up a new inode and create an object for it on the OSD
1291 */
1292struct inode *exofs_new_inode(struct inode *dir, umode_t mode)
1293{
1294        struct super_block *sb = dir->i_sb;
1295        struct exofs_sb_info *sbi = sb->s_fs_info;
1296        struct inode *inode;
1297        struct exofs_i_info *oi;
1298        struct ore_io_state *ios;
1299        int ret;
1300
1301        inode = new_inode(sb);
1302        if (!inode)
1303                return ERR_PTR(-ENOMEM);
1304
1305        oi = exofs_i(inode);
1306        __oi_init(oi);
1307
1308        set_obj_2bcreated(oi);
1309
1310        inode->i_mapping->backing_dev_info = sb->s_bdi;
1311        inode_init_owner(inode, dir, mode);
1312        inode->i_ino = sbi->s_nextid++;
1313        inode->i_blkbits = EXOFS_BLKSHIFT;
1314        inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1315        oi->i_commit_size = inode->i_size = 0;
1316        spin_lock(&sbi->s_next_gen_lock);
1317        inode->i_generation = sbi->s_next_generation++;
1318        spin_unlock(&sbi->s_next_gen_lock);
1319        insert_inode_hash(inode);
1320
1321        exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1322                         exofs_oi_objno(oi));
1323        exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
1324
1325        mark_inode_dirty(inode);
1326
1327        ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1328        if (unlikely(ret)) {
1329                EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n");
1330                return ERR_PTR(ret);
1331        }
1332
1333        ios->done = create_done;
1334        ios->private = inode;
1335
1336        ret = ore_create(ios);
1337        if (ret) {
1338                ore_put_io_state(ios);
1339                return ERR_PTR(ret);
1340        }
1341        atomic_inc(&sbi->s_curr_pending);
1342
1343        return inode;
1344}
1345
1346/*
1347 * struct to pass two arguments to update_inode's callback
1348 */
1349struct updatei_args {
1350        struct exofs_sb_info    *sbi;
1351        struct exofs_fcb        fcb;
1352};
1353
1354/*
1355 * Callback function from exofs_update_inode().
1356 */
1357static void updatei_done(struct ore_io_state *ios, void *p)
1358{
1359        struct updatei_args *args = p;
1360
1361        ore_put_io_state(ios);
1362
1363        atomic_dec(&args->sbi->s_curr_pending);
1364
1365        kfree(args);
1366}
1367
1368/*
1369 * Write the inode to the OSD.  Just fill up the struct, and set the attribute
1370 * synchronously or asynchronously depending on the do_sync flag.
1371 */
1372static int exofs_update_inode(struct inode *inode, int do_sync)
1373{
1374        struct exofs_i_info *oi = exofs_i(inode);
1375        struct super_block *sb = inode->i_sb;
1376        struct exofs_sb_info *sbi = sb->s_fs_info;
1377        struct ore_io_state *ios;
1378        struct osd_attr attr;
1379        struct exofs_fcb *fcb;
1380        struct updatei_args *args;
1381        int ret;
1382
1383        args = kzalloc(sizeof(*args), GFP_KERNEL);
1384        if (!args) {
1385                EXOFS_DBGMSG("Failed kzalloc of args\n");
1386                return -ENOMEM;
1387        }
1388
1389        fcb = &args->fcb;
1390
1391        fcb->i_mode = cpu_to_le16(inode->i_mode);
1392        fcb->i_uid = cpu_to_le32(i_uid_read(inode));
1393        fcb->i_gid = cpu_to_le32(i_gid_read(inode));
1394        fcb->i_links_count = cpu_to_le16(inode->i_nlink);
1395        fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
1396        fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
1397        fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
1398        oi->i_commit_size = i_size_read(inode);
1399        fcb->i_size = cpu_to_le64(oi->i_commit_size);
1400        fcb->i_generation = cpu_to_le32(inode->i_generation);
1401
1402        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1403                if (old_valid_dev(inode->i_rdev)) {
1404                        fcb->i_data[0] =
1405                                cpu_to_le32(old_encode_dev(inode->i_rdev));
1406                        fcb->i_data[1] = 0;
1407                } else {
1408                        fcb->i_data[0] = 0;
1409                        fcb->i_data[1] =
1410                                cpu_to_le32(new_encode_dev(inode->i_rdev));
1411                        fcb->i_data[2] = 0;
1412                }
1413        } else
1414                memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
1415
1416        ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1417        if (unlikely(ret)) {
1418                EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1419                goto free_args;
1420        }
1421
1422        attr = g_attr_inode_data;
1423        attr.val_ptr = fcb;
1424        ios->out_attr_len = 1;
1425        ios->out_attr = &attr;
1426
1427        wait_obj_created(oi);
1428
1429        if (!do_sync) {
1430                args->sbi = sbi;
1431                ios->done = updatei_done;
1432                ios->private = args;
1433        }
1434
1435        ret = ore_write(ios);
1436        if (!do_sync && !ret) {
1437                atomic_inc(&sbi->s_curr_pending);
1438                goto out; /* deallocation in updatei_done */
1439        }
1440
1441        ore_put_io_state(ios);
1442free_args:
1443        kfree(args);
1444out:
1445        EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
1446                     inode->i_ino, do_sync, ret);
1447        return ret;
1448}
1449
1450int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
1451{
1452        /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */
1453        return exofs_update_inode(inode, 1);
1454}
1455
1456/*
1457 * Callback function from exofs_delete_inode() - don't have much cleaning up to
1458 * do.
1459 */
1460static void delete_done(struct ore_io_state *ios, void *p)
1461{
1462        struct exofs_sb_info *sbi = p;
1463
1464        ore_put_io_state(ios);
1465
1466        atomic_dec(&sbi->s_curr_pending);
1467}
1468
1469/*
1470 * Called when the refcount of an inode reaches zero.  We remove the object
1471 * from the OSD here.  We make sure the object was created before we try and
1472 * delete it.
1473 */
1474void exofs_evict_inode(struct inode *inode)
1475{
1476        struct exofs_i_info *oi = exofs_i(inode);
1477        struct super_block *sb = inode->i_sb;
1478        struct exofs_sb_info *sbi = sb->s_fs_info;
1479        struct ore_io_state *ios;
1480        int ret;
1481
1482        truncate_inode_pages(&inode->i_data, 0);
1483
1484        /* TODO: should do better here */
1485        if (inode->i_nlink || is_bad_inode(inode))
1486                goto no_delete;
1487
1488        inode->i_size = 0;
1489        clear_inode(inode);
1490
1491        /* if we are deleting an obj that hasn't been created yet, wait.
1492         * This also makes sure that create_done cannot be called with an
1493         * already evicted inode.
1494         */
1495        wait_obj_created(oi);
1496        /* ignore the error, attempt a remove anyway */
1497
1498        /* Now Remove the OSD objects */
1499        ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1500        if (unlikely(ret)) {
1501                EXOFS_ERR("%s: ore_get_io_state failed\n", __func__);
1502                return;
1503        }
1504
1505        ios->done = delete_done;
1506        ios->private = sbi;
1507
1508        ret = ore_remove(ios);
1509        if (ret) {
1510                EXOFS_ERR("%s: ore_remove failed\n", __func__);
1511                ore_put_io_state(ios);
1512                return;
1513        }
1514        atomic_inc(&sbi->s_curr_pending);
1515
1516        return;
1517
1518no_delete:
1519        clear_inode(inode);
1520}
1521
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