linux/fs/reiserfs/inode.c
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   1/*
   2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3 */
   4
   5#include <linux/time.h>
   6#include <linux/fs.h>
   7#include "reiserfs.h"
   8#include "acl.h"
   9#include "xattr.h"
  10#include <linux/exportfs.h>
  11#include <linux/pagemap.h>
  12#include <linux/highmem.h>
  13#include <linux/slab.h>
  14#include <asm/uaccess.h>
  15#include <asm/unaligned.h>
  16#include <linux/buffer_head.h>
  17#include <linux/mpage.h>
  18#include <linux/writeback.h>
  19#include <linux/quotaops.h>
  20#include <linux/swap.h>
  21
  22int reiserfs_commit_write(struct file *f, struct page *page,
  23                          unsigned from, unsigned to);
  24
  25void reiserfs_evict_inode(struct inode *inode)
  26{
  27        /* We need blocks for transaction + (user+group) quota update (possibly delete) */
  28        int jbegin_count =
  29            JOURNAL_PER_BALANCE_CNT * 2 +
  30            2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb);
  31        struct reiserfs_transaction_handle th;
  32        int depth;
  33        int err;
  34
  35        if (!inode->i_nlink && !is_bad_inode(inode))
  36                dquot_initialize(inode);
  37
  38        truncate_inode_pages(&inode->i_data, 0);
  39        if (inode->i_nlink)
  40                goto no_delete;
  41
  42        depth = reiserfs_write_lock_once(inode->i_sb);
  43
  44        /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
  45        if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) {  /* also handles bad_inode case */
  46                reiserfs_delete_xattrs(inode);
  47
  48                if (journal_begin(&th, inode->i_sb, jbegin_count))
  49                        goto out;
  50                reiserfs_update_inode_transaction(inode);
  51
  52                reiserfs_discard_prealloc(&th, inode);
  53
  54                err = reiserfs_delete_object(&th, inode);
  55
  56                /* Do quota update inside a transaction for journaled quotas. We must do that
  57                 * after delete_object so that quota updates go into the same transaction as
  58                 * stat data deletion */
  59                if (!err) 
  60                        dquot_free_inode(inode);
  61
  62                if (journal_end(&th, inode->i_sb, jbegin_count))
  63                        goto out;
  64
  65                /* check return value from reiserfs_delete_object after
  66                 * ending the transaction
  67                 */
  68                if (err)
  69                    goto out;
  70
  71                /* all items of file are deleted, so we can remove "save" link */
  72                remove_save_link(inode, 0 /* not truncate */ ); /* we can't do anything
  73                                                                 * about an error here */
  74        } else {
  75                /* no object items are in the tree */
  76                ;
  77        }
  78      out:
  79        reiserfs_write_unlock_once(inode->i_sb, depth);
  80        clear_inode(inode);     /* note this must go after the journal_end to prevent deadlock */
  81        dquot_drop(inode);
  82        inode->i_blocks = 0;
  83        return;
  84
  85no_delete:
  86        clear_inode(inode);
  87        dquot_drop(inode);
  88}
  89
  90static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid,
  91                          __u32 objectid, loff_t offset, int type, int length)
  92{
  93        key->version = version;
  94
  95        key->on_disk_key.k_dir_id = dirid;
  96        key->on_disk_key.k_objectid = objectid;
  97        set_cpu_key_k_offset(key, offset);
  98        set_cpu_key_k_type(key, type);
  99        key->key_length = length;
 100}
 101
 102/* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set
 103   offset and type of key */
 104void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset,
 105                  int type, int length)
 106{
 107        _make_cpu_key(key, get_inode_item_key_version(inode),
 108                      le32_to_cpu(INODE_PKEY(inode)->k_dir_id),
 109                      le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type,
 110                      length);
 111}
 112
 113//
 114// when key is 0, do not set version and short key
 115//
 116inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
 117                              int version,
 118                              loff_t offset, int type, int length,
 119                              int entry_count /*or ih_free_space */ )
 120{
 121        if (key) {
 122                ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id);
 123                ih->ih_key.k_objectid =
 124                    cpu_to_le32(key->on_disk_key.k_objectid);
 125        }
 126        put_ih_version(ih, version);
 127        set_le_ih_k_offset(ih, offset);
 128        set_le_ih_k_type(ih, type);
 129        put_ih_item_len(ih, length);
 130        /*    set_ih_free_space (ih, 0); */
 131        // for directory items it is entry count, for directs and stat
 132        // datas - 0xffff, for indirects - 0
 133        put_ih_entry_count(ih, entry_count);
 134}
 135
 136//
 137// FIXME: we might cache recently accessed indirect item
 138
 139// Ugh.  Not too eager for that....
 140//  I cut the code until such time as I see a convincing argument (benchmark).
 141// I don't want a bloated inode struct..., and I don't like code complexity....
 142
 143/* cutting the code is fine, since it really isn't in use yet and is easy
 144** to add back in.  But, Vladimir has a really good idea here.  Think
 145** about what happens for reading a file.  For each page,
 146** The VFS layer calls reiserfs_readpage, who searches the tree to find
 147** an indirect item.  This indirect item has X number of pointers, where
 148** X is a big number if we've done the block allocation right.  But,
 149** we only use one or two of these pointers during each call to readpage,
 150** needlessly researching again later on.
 151**
 152** The size of the cache could be dynamic based on the size of the file.
 153**
 154** I'd also like to see us cache the location the stat data item, since
 155** we are needlessly researching for that frequently.
 156**
 157** --chris
 158*/
 159
 160/* If this page has a file tail in it, and
 161** it was read in by get_block_create_0, the page data is valid,
 162** but tail is still sitting in a direct item, and we can't write to
 163** it.  So, look through this page, and check all the mapped buffers
 164** to make sure they have valid block numbers.  Any that don't need
 165** to be unmapped, so that __block_write_begin will correctly call
 166** reiserfs_get_block to convert the tail into an unformatted node
 167*/
 168static inline void fix_tail_page_for_writing(struct page *page)
 169{
 170        struct buffer_head *head, *next, *bh;
 171
 172        if (page && page_has_buffers(page)) {
 173                head = page_buffers(page);
 174                bh = head;
 175                do {
 176                        next = bh->b_this_page;
 177                        if (buffer_mapped(bh) && bh->b_blocknr == 0) {
 178                                reiserfs_unmap_buffer(bh);
 179                        }
 180                        bh = next;
 181                } while (bh != head);
 182        }
 183}
 184
 185/* reiserfs_get_block does not need to allocate a block only if it has been
 186   done already or non-hole position has been found in the indirect item */
 187static inline int allocation_needed(int retval, b_blocknr_t allocated,
 188                                    struct item_head *ih,
 189                                    __le32 * item, int pos_in_item)
 190{
 191        if (allocated)
 192                return 0;
 193        if (retval == POSITION_FOUND && is_indirect_le_ih(ih) &&
 194            get_block_num(item, pos_in_item))
 195                return 0;
 196        return 1;
 197}
 198
 199static inline int indirect_item_found(int retval, struct item_head *ih)
 200{
 201        return (retval == POSITION_FOUND) && is_indirect_le_ih(ih);
 202}
 203
 204static inline void set_block_dev_mapped(struct buffer_head *bh,
 205                                        b_blocknr_t block, struct inode *inode)
 206{
 207        map_bh(bh, inode->i_sb, block);
 208}
 209
 210//
 211// files which were created in the earlier version can not be longer,
 212// than 2 gb
 213//
 214static int file_capable(struct inode *inode, sector_t block)
 215{
 216        if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 ||      // it is new file.
 217            block < (1 << (31 - inode->i_sb->s_blocksize_bits)))        // old file, but 'block' is inside of 2gb
 218                return 1;
 219
 220        return 0;
 221}
 222
 223static int restart_transaction(struct reiserfs_transaction_handle *th,
 224                               struct inode *inode, struct treepath *path)
 225{
 226        struct super_block *s = th->t_super;
 227        int len = th->t_blocks_allocated;
 228        int err;
 229
 230        BUG_ON(!th->t_trans_id);
 231        BUG_ON(!th->t_refcount);
 232
 233        pathrelse(path);
 234
 235        /* we cannot restart while nested */
 236        if (th->t_refcount > 1) {
 237                return 0;
 238        }
 239        reiserfs_update_sd(th, inode);
 240        err = journal_end(th, s, len);
 241        if (!err) {
 242                err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6);
 243                if (!err)
 244                        reiserfs_update_inode_transaction(inode);
 245        }
 246        return err;
 247}
 248
 249// it is called by get_block when create == 0. Returns block number
 250// for 'block'-th logical block of file. When it hits direct item it
 251// returns 0 (being called from bmap) or read direct item into piece
 252// of page (bh_result)
 253
 254// Please improve the english/clarity in the comment above, as it is
 255// hard to understand.
 256
 257static int _get_block_create_0(struct inode *inode, sector_t block,
 258                               struct buffer_head *bh_result, int args)
 259{
 260        INITIALIZE_PATH(path);
 261        struct cpu_key key;
 262        struct buffer_head *bh;
 263        struct item_head *ih, tmp_ih;
 264        b_blocknr_t blocknr;
 265        char *p = NULL;
 266        int chars;
 267        int ret;
 268        int result;
 269        int done = 0;
 270        unsigned long offset;
 271
 272        // prepare the key to look for the 'block'-th block of file
 273        make_cpu_key(&key, inode,
 274                     (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY,
 275                     3);
 276
 277        result = search_for_position_by_key(inode->i_sb, &key, &path);
 278        if (result != POSITION_FOUND) {
 279                pathrelse(&path);
 280                if (p)
 281                        kunmap(bh_result->b_page);
 282                if (result == IO_ERROR)
 283                        return -EIO;
 284                // We do not return -ENOENT if there is a hole but page is uptodate, because it means
 285                // That there is some MMAPED data associated with it that is yet to be written to disk.
 286                if ((args & GET_BLOCK_NO_HOLE)
 287                    && !PageUptodate(bh_result->b_page)) {
 288                        return -ENOENT;
 289                }
 290                return 0;
 291        }
 292        //
 293        bh = get_last_bh(&path);
 294        ih = get_ih(&path);
 295        if (is_indirect_le_ih(ih)) {
 296                __le32 *ind_item = (__le32 *) B_I_PITEM(bh, ih);
 297
 298                /* FIXME: here we could cache indirect item or part of it in
 299                   the inode to avoid search_by_key in case of subsequent
 300                   access to file */
 301                blocknr = get_block_num(ind_item, path.pos_in_item);
 302                ret = 0;
 303                if (blocknr) {
 304                        map_bh(bh_result, inode->i_sb, blocknr);
 305                        if (path.pos_in_item ==
 306                            ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) {
 307                                set_buffer_boundary(bh_result);
 308                        }
 309                } else
 310                        // We do not return -ENOENT if there is a hole but page is uptodate, because it means
 311                        // That there is some MMAPED data associated with it that is yet to  be written to disk.
 312                if ((args & GET_BLOCK_NO_HOLE)
 313                            && !PageUptodate(bh_result->b_page)) {
 314                        ret = -ENOENT;
 315                }
 316
 317                pathrelse(&path);
 318                if (p)
 319                        kunmap(bh_result->b_page);
 320                return ret;
 321        }
 322        // requested data are in direct item(s)
 323        if (!(args & GET_BLOCK_READ_DIRECT)) {
 324                // we are called by bmap. FIXME: we can not map block of file
 325                // when it is stored in direct item(s)
 326                pathrelse(&path);
 327                if (p)
 328                        kunmap(bh_result->b_page);
 329                return -ENOENT;
 330        }
 331
 332        /* if we've got a direct item, and the buffer or page was uptodate,
 333         ** we don't want to pull data off disk again.  skip to the
 334         ** end, where we map the buffer and return
 335         */
 336        if (buffer_uptodate(bh_result)) {
 337                goto finished;
 338        } else
 339                /*
 340                 ** grab_tail_page can trigger calls to reiserfs_get_block on up to date
 341                 ** pages without any buffers.  If the page is up to date, we don't want
 342                 ** read old data off disk.  Set the up to date bit on the buffer instead
 343                 ** and jump to the end
 344                 */
 345        if (!bh_result->b_page || PageUptodate(bh_result->b_page)) {
 346                set_buffer_uptodate(bh_result);
 347                goto finished;
 348        }
 349        // read file tail into part of page
 350        offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1);
 351        copy_item_head(&tmp_ih, ih);
 352
 353        /* we only want to kmap if we are reading the tail into the page.
 354         ** this is not the common case, so we don't kmap until we are
 355         ** sure we need to.  But, this means the item might move if
 356         ** kmap schedules
 357         */
 358        if (!p)
 359                p = (char *)kmap(bh_result->b_page);
 360
 361        p += offset;
 362        memset(p, 0, inode->i_sb->s_blocksize);
 363        do {
 364                if (!is_direct_le_ih(ih)) {
 365                        BUG();
 366                }
 367                /* make sure we don't read more bytes than actually exist in
 368                 ** the file.  This can happen in odd cases where i_size isn't
 369                 ** correct, and when direct item padding results in a few
 370                 ** extra bytes at the end of the direct item
 371                 */
 372                if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size)
 373                        break;
 374                if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) {
 375                        chars =
 376                            inode->i_size - (le_ih_k_offset(ih) - 1) -
 377                            path.pos_in_item;
 378                        done = 1;
 379                } else {
 380                        chars = ih_item_len(ih) - path.pos_in_item;
 381                }
 382                memcpy(p, B_I_PITEM(bh, ih) + path.pos_in_item, chars);
 383
 384                if (done)
 385                        break;
 386
 387                p += chars;
 388
 389                if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1))
 390                        // we done, if read direct item is not the last item of
 391                        // node FIXME: we could try to check right delimiting key
 392                        // to see whether direct item continues in the right
 393                        // neighbor or rely on i_size
 394                        break;
 395
 396                // update key to look for the next piece
 397                set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars);
 398                result = search_for_position_by_key(inode->i_sb, &key, &path);
 399                if (result != POSITION_FOUND)
 400                        // i/o error most likely
 401                        break;
 402                bh = get_last_bh(&path);
 403                ih = get_ih(&path);
 404        } while (1);
 405
 406        flush_dcache_page(bh_result->b_page);
 407        kunmap(bh_result->b_page);
 408
 409      finished:
 410        pathrelse(&path);
 411
 412        if (result == IO_ERROR)
 413                return -EIO;
 414
 415        /* this buffer has valid data, but isn't valid for io.  mapping it to
 416         * block #0 tells the rest of reiserfs it just has a tail in it
 417         */
 418        map_bh(bh_result, inode->i_sb, 0);
 419        set_buffer_uptodate(bh_result);
 420        return 0;
 421}
 422
 423// this is called to create file map. So, _get_block_create_0 will not
 424// read direct item
 425static int reiserfs_bmap(struct inode *inode, sector_t block,
 426                         struct buffer_head *bh_result, int create)
 427{
 428        if (!file_capable(inode, block))
 429                return -EFBIG;
 430
 431        reiserfs_write_lock(inode->i_sb);
 432        /* do not read the direct item */
 433        _get_block_create_0(inode, block, bh_result, 0);
 434        reiserfs_write_unlock(inode->i_sb);
 435        return 0;
 436}
 437
 438/* special version of get_block that is only used by grab_tail_page right
 439** now.  It is sent to __block_write_begin, and when you try to get a
 440** block past the end of the file (or a block from a hole) it returns
 441** -ENOENT instead of a valid buffer.  __block_write_begin expects to
 442** be able to do i/o on the buffers returned, unless an error value
 443** is also returned.
 444**
 445** So, this allows __block_write_begin to be used for reading a single block
 446** in a page.  Where it does not produce a valid page for holes, or past the
 447** end of the file.  This turns out to be exactly what we need for reading
 448** tails for conversion.
 449**
 450** The point of the wrapper is forcing a certain value for create, even
 451** though the VFS layer is calling this function with create==1.  If you
 452** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block,
 453** don't use this function.
 454*/
 455static int reiserfs_get_block_create_0(struct inode *inode, sector_t block,
 456                                       struct buffer_head *bh_result,
 457                                       int create)
 458{
 459        return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE);
 460}
 461
 462/* This is special helper for reiserfs_get_block in case we are executing
 463   direct_IO request. */
 464static int reiserfs_get_blocks_direct_io(struct inode *inode,
 465                                         sector_t iblock,
 466                                         struct buffer_head *bh_result,
 467                                         int create)
 468{
 469        int ret;
 470
 471        bh_result->b_page = NULL;
 472
 473        /* We set the b_size before reiserfs_get_block call since it is
 474           referenced in convert_tail_for_hole() that may be called from
 475           reiserfs_get_block() */
 476        bh_result->b_size = (1 << inode->i_blkbits);
 477
 478        ret = reiserfs_get_block(inode, iblock, bh_result,
 479                                 create | GET_BLOCK_NO_DANGLE);
 480        if (ret)
 481                goto out;
 482
 483        /* don't allow direct io onto tail pages */
 484        if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
 485                /* make sure future calls to the direct io funcs for this offset
 486                 ** in the file fail by unmapping the buffer
 487                 */
 488                clear_buffer_mapped(bh_result);
 489                ret = -EINVAL;
 490        }
 491        /* Possible unpacked tail. Flush the data before pages have
 492           disappeared */
 493        if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) {
 494                int err;
 495
 496                reiserfs_write_lock(inode->i_sb);
 497
 498                err = reiserfs_commit_for_inode(inode);
 499                REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
 500
 501                reiserfs_write_unlock(inode->i_sb);
 502
 503                if (err < 0)
 504                        ret = err;
 505        }
 506      out:
 507        return ret;
 508}
 509
 510/*
 511** helper function for when reiserfs_get_block is called for a hole
 512** but the file tail is still in a direct item
 513** bh_result is the buffer head for the hole
 514** tail_offset is the offset of the start of the tail in the file
 515**
 516** This calls prepare_write, which will start a new transaction
 517** you should not be in a transaction, or have any paths held when you
 518** call this.
 519*/
 520static int convert_tail_for_hole(struct inode *inode,
 521                                 struct buffer_head *bh_result,
 522                                 loff_t tail_offset)
 523{
 524        unsigned long index;
 525        unsigned long tail_end;
 526        unsigned long tail_start;
 527        struct page *tail_page;
 528        struct page *hole_page = bh_result->b_page;
 529        int retval = 0;
 530
 531        if ((tail_offset & (bh_result->b_size - 1)) != 1)
 532                return -EIO;
 533
 534        /* always try to read until the end of the block */
 535        tail_start = tail_offset & (PAGE_CACHE_SIZE - 1);
 536        tail_end = (tail_start | (bh_result->b_size - 1)) + 1;
 537
 538        index = tail_offset >> PAGE_CACHE_SHIFT;
 539        /* hole_page can be zero in case of direct_io, we are sure
 540           that we cannot get here if we write with O_DIRECT into
 541           tail page */
 542        if (!hole_page || index != hole_page->index) {
 543                tail_page = grab_cache_page(inode->i_mapping, index);
 544                retval = -ENOMEM;
 545                if (!tail_page) {
 546                        goto out;
 547                }
 548        } else {
 549                tail_page = hole_page;
 550        }
 551
 552        /* we don't have to make sure the conversion did not happen while
 553         ** we were locking the page because anyone that could convert
 554         ** must first take i_mutex.
 555         **
 556         ** We must fix the tail page for writing because it might have buffers
 557         ** that are mapped, but have a block number of 0.  This indicates tail
 558         ** data that has been read directly into the page, and
 559         ** __block_write_begin won't trigger a get_block in this case.
 560         */
 561        fix_tail_page_for_writing(tail_page);
 562        retval = __reiserfs_write_begin(tail_page, tail_start,
 563                                      tail_end - tail_start);
 564        if (retval)
 565                goto unlock;
 566
 567        /* tail conversion might change the data in the page */
 568        flush_dcache_page(tail_page);
 569
 570        retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end);
 571
 572      unlock:
 573        if (tail_page != hole_page) {
 574                unlock_page(tail_page);
 575                page_cache_release(tail_page);
 576        }
 577      out:
 578        return retval;
 579}
 580
 581static inline int _allocate_block(struct reiserfs_transaction_handle *th,
 582                                  sector_t block,
 583                                  struct inode *inode,
 584                                  b_blocknr_t * allocated_block_nr,
 585                                  struct treepath *path, int flags)
 586{
 587        BUG_ON(!th->t_trans_id);
 588
 589#ifdef REISERFS_PREALLOCATE
 590        if (!(flags & GET_BLOCK_NO_IMUX)) {
 591                return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr,
 592                                                  path, block);
 593        }
 594#endif
 595        return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path,
 596                                         block);
 597}
 598
 599int reiserfs_get_block(struct inode *inode, sector_t block,
 600                       struct buffer_head *bh_result, int create)
 601{
 602        int repeat, retval = 0;
 603        b_blocknr_t allocated_block_nr = 0;     // b_blocknr_t is (unsigned) 32 bit int
 604        INITIALIZE_PATH(path);
 605        int pos_in_item;
 606        struct cpu_key key;
 607        struct buffer_head *bh, *unbh = NULL;
 608        struct item_head *ih, tmp_ih;
 609        __le32 *item;
 610        int done;
 611        int fs_gen;
 612        int lock_depth;
 613        struct reiserfs_transaction_handle *th = NULL;
 614        /* space reserved in transaction batch:
 615           . 3 balancings in direct->indirect conversion
 616           . 1 block involved into reiserfs_update_sd()
 617           XXX in practically impossible worst case direct2indirect()
 618           can incur (much) more than 3 balancings.
 619           quota update for user, group */
 620        int jbegin_count =
 621            JOURNAL_PER_BALANCE_CNT * 3 + 1 +
 622            2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
 623        int version;
 624        int dangle = 1;
 625        loff_t new_offset =
 626            (((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;
 627
 628        lock_depth = reiserfs_write_lock_once(inode->i_sb);
 629        version = get_inode_item_key_version(inode);
 630
 631        if (!file_capable(inode, block)) {
 632                reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 633                return -EFBIG;
 634        }
 635
 636        /* if !create, we aren't changing the FS, so we don't need to
 637         ** log anything, so we don't need to start a transaction
 638         */
 639        if (!(create & GET_BLOCK_CREATE)) {
 640                int ret;
 641                /* find number of block-th logical block of the file */
 642                ret = _get_block_create_0(inode, block, bh_result,
 643                                          create | GET_BLOCK_READ_DIRECT);
 644                reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 645                return ret;
 646        }
 647        /*
 648         * if we're already in a transaction, make sure to close
 649         * any new transactions we start in this func
 650         */
 651        if ((create & GET_BLOCK_NO_DANGLE) ||
 652            reiserfs_transaction_running(inode->i_sb))
 653                dangle = 0;
 654
 655        /* If file is of such a size, that it might have a tail and tails are enabled
 656         ** we should mark it as possibly needing tail packing on close
 657         */
 658        if ((have_large_tails(inode->i_sb)
 659             && inode->i_size < i_block_size(inode) * 4)
 660            || (have_small_tails(inode->i_sb)
 661                && inode->i_size < i_block_size(inode)))
 662                REISERFS_I(inode)->i_flags |= i_pack_on_close_mask;
 663
 664        /* set the key of the first byte in the 'block'-th block of file */
 665        make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ );
 666        if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) {
 667              start_trans:
 668                th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count);
 669                if (!th) {
 670                        retval = -ENOMEM;
 671                        goto failure;
 672                }
 673                reiserfs_update_inode_transaction(inode);
 674        }
 675      research:
 676
 677        retval = search_for_position_by_key(inode->i_sb, &key, &path);
 678        if (retval == IO_ERROR) {
 679                retval = -EIO;
 680                goto failure;
 681        }
 682
 683        bh = get_last_bh(&path);
 684        ih = get_ih(&path);
 685        item = get_item(&path);
 686        pos_in_item = path.pos_in_item;
 687
 688        fs_gen = get_generation(inode->i_sb);
 689        copy_item_head(&tmp_ih, ih);
 690
 691        if (allocation_needed
 692            (retval, allocated_block_nr, ih, item, pos_in_item)) {
 693                /* we have to allocate block for the unformatted node */
 694                if (!th) {
 695                        pathrelse(&path);
 696                        goto start_trans;
 697                }
 698
 699                repeat =
 700                    _allocate_block(th, block, inode, &allocated_block_nr,
 701                                    &path, create);
 702
 703                if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) {
 704                        /* restart the transaction to give the journal a chance to free
 705                         ** some blocks.  releases the path, so we have to go back to
 706                         ** research if we succeed on the second try
 707                         */
 708                        SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1;
 709                        retval = restart_transaction(th, inode, &path);
 710                        if (retval)
 711                                goto failure;
 712                        repeat =
 713                            _allocate_block(th, block, inode,
 714                                            &allocated_block_nr, NULL, create);
 715
 716                        if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) {
 717                                goto research;
 718                        }
 719                        if (repeat == QUOTA_EXCEEDED)
 720                                retval = -EDQUOT;
 721                        else
 722                                retval = -ENOSPC;
 723                        goto failure;
 724                }
 725
 726                if (fs_changed(fs_gen, inode->i_sb)
 727                    && item_moved(&tmp_ih, &path)) {
 728                        goto research;
 729                }
 730        }
 731
 732        if (indirect_item_found(retval, ih)) {
 733                b_blocknr_t unfm_ptr;
 734                /* 'block'-th block is in the file already (there is
 735                   corresponding cell in some indirect item). But it may be
 736                   zero unformatted node pointer (hole) */
 737                unfm_ptr = get_block_num(item, pos_in_item);
 738                if (unfm_ptr == 0) {
 739                        /* use allocated block to plug the hole */
 740                        reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
 741                        if (fs_changed(fs_gen, inode->i_sb)
 742                            && item_moved(&tmp_ih, &path)) {
 743                                reiserfs_restore_prepared_buffer(inode->i_sb,
 744                                                                 bh);
 745                                goto research;
 746                        }
 747                        set_buffer_new(bh_result);
 748                        if (buffer_dirty(bh_result)
 749                            && reiserfs_data_ordered(inode->i_sb))
 750                                reiserfs_add_ordered_list(inode, bh_result);
 751                        put_block_num(item, pos_in_item, allocated_block_nr);
 752                        unfm_ptr = allocated_block_nr;
 753                        journal_mark_dirty(th, inode->i_sb, bh);
 754                        reiserfs_update_sd(th, inode);
 755                }
 756                set_block_dev_mapped(bh_result, unfm_ptr, inode);
 757                pathrelse(&path);
 758                retval = 0;
 759                if (!dangle && th)
 760                        retval = reiserfs_end_persistent_transaction(th);
 761
 762                reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 763
 764                /* the item was found, so new blocks were not added to the file
 765                 ** there is no need to make sure the inode is updated with this
 766                 ** transaction
 767                 */
 768                return retval;
 769        }
 770
 771        if (!th) {
 772                pathrelse(&path);
 773                goto start_trans;
 774        }
 775
 776        /* desired position is not found or is in the direct item. We have
 777           to append file with holes up to 'block'-th block converting
 778           direct items to indirect one if necessary */
 779        done = 0;
 780        do {
 781                if (is_statdata_le_ih(ih)) {
 782                        __le32 unp = 0;
 783                        struct cpu_key tmp_key;
 784
 785                        /* indirect item has to be inserted */
 786                        make_le_item_head(&tmp_ih, &key, version, 1,
 787                                          TYPE_INDIRECT, UNFM_P_SIZE,
 788                                          0 /* free_space */ );
 789
 790                        if (cpu_key_k_offset(&key) == 1) {
 791                                /* we are going to add 'block'-th block to the file. Use
 792                                   allocated block for that */
 793                                unp = cpu_to_le32(allocated_block_nr);
 794                                set_block_dev_mapped(bh_result,
 795                                                     allocated_block_nr, inode);
 796                                set_buffer_new(bh_result);
 797                                done = 1;
 798                        }
 799                        tmp_key = key;  // ;)
 800                        set_cpu_key_k_offset(&tmp_key, 1);
 801                        PATH_LAST_POSITION(&path)++;
 802
 803                        retval =
 804                            reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih,
 805                                                 inode, (char *)&unp);
 806                        if (retval) {
 807                                reiserfs_free_block(th, inode,
 808                                                    allocated_block_nr, 1);
 809                                goto failure;   // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST
 810                        }
 811                        //mark_tail_converted (inode);
 812                } else if (is_direct_le_ih(ih)) {
 813                        /* direct item has to be converted */
 814                        loff_t tail_offset;
 815
 816                        tail_offset =
 817                            ((le_ih_k_offset(ih) -
 818                              1) & ~(inode->i_sb->s_blocksize - 1)) + 1;
 819                        if (tail_offset == cpu_key_k_offset(&key)) {
 820                                /* direct item we just found fits into block we have
 821                                   to map. Convert it into unformatted node: use
 822                                   bh_result for the conversion */
 823                                set_block_dev_mapped(bh_result,
 824                                                     allocated_block_nr, inode);
 825                                unbh = bh_result;
 826                                done = 1;
 827                        } else {
 828                                /* we have to padd file tail stored in direct item(s)
 829                                   up to block size and convert it to unformatted
 830                                   node. FIXME: this should also get into page cache */
 831
 832                                pathrelse(&path);
 833                                /*
 834                                 * ugly, but we can only end the transaction if
 835                                 * we aren't nested
 836                                 */
 837                                BUG_ON(!th->t_refcount);
 838                                if (th->t_refcount == 1) {
 839                                        retval =
 840                                            reiserfs_end_persistent_transaction
 841                                            (th);
 842                                        th = NULL;
 843                                        if (retval)
 844                                                goto failure;
 845                                }
 846
 847                                retval =
 848                                    convert_tail_for_hole(inode, bh_result,
 849                                                          tail_offset);
 850                                if (retval) {
 851                                        if (retval != -ENOSPC)
 852                                                reiserfs_error(inode->i_sb,
 853                                                        "clm-6004",
 854                                                        "convert tail failed "
 855                                                        "inode %lu, error %d",
 856                                                        inode->i_ino,
 857                                                        retval);
 858                                        if (allocated_block_nr) {
 859                                                /* the bitmap, the super, and the stat data == 3 */
 860                                                if (!th)
 861                                                        th = reiserfs_persistent_transaction(inode->i_sb, 3);
 862                                                if (th)
 863                                                        reiserfs_free_block(th,
 864                                                                            inode,
 865                                                                            allocated_block_nr,
 866                                                                            1);
 867                                        }
 868                                        goto failure;
 869                                }
 870                                goto research;
 871                        }
 872                        retval =
 873                            direct2indirect(th, inode, &path, unbh,
 874                                            tail_offset);
 875                        if (retval) {
 876                                reiserfs_unmap_buffer(unbh);
 877                                reiserfs_free_block(th, inode,
 878                                                    allocated_block_nr, 1);
 879                                goto failure;
 880                        }
 881                        /* it is important the set_buffer_uptodate is done after
 882                         ** the direct2indirect.  The buffer might contain valid
 883                         ** data newer than the data on disk (read by readpage, changed,
 884                         ** and then sent here by writepage).  direct2indirect needs
 885                         ** to know if unbh was already up to date, so it can decide
 886                         ** if the data in unbh needs to be replaced with data from
 887                         ** the disk
 888                         */
 889                        set_buffer_uptodate(unbh);
 890
 891                        /* unbh->b_page == NULL in case of DIRECT_IO request, this means
 892                           buffer will disappear shortly, so it should not be added to
 893                         */
 894                        if (unbh->b_page) {
 895                                /* we've converted the tail, so we must
 896                                 ** flush unbh before the transaction commits
 897                                 */
 898                                reiserfs_add_tail_list(inode, unbh);
 899
 900                                /* mark it dirty now to prevent commit_write from adding
 901                                 ** this buffer to the inode's dirty buffer list
 902                                 */
 903                                /*
 904                                 * AKPM: changed __mark_buffer_dirty to mark_buffer_dirty().
 905                                 * It's still atomic, but it sets the page dirty too,
 906                                 * which makes it eligible for writeback at any time by the
 907                                 * VM (which was also the case with __mark_buffer_dirty())
 908                                 */
 909                                mark_buffer_dirty(unbh);
 910                        }
 911                } else {
 912                        /* append indirect item with holes if needed, when appending
 913                           pointer to 'block'-th block use block, which is already
 914                           allocated */
 915                        struct cpu_key tmp_key;
 916                        unp_t unf_single = 0;   // We use this in case we need to allocate only
 917                        // one block which is a fastpath
 918                        unp_t *un;
 919                        __u64 max_to_insert =
 920                            MAX_ITEM_LEN(inode->i_sb->s_blocksize) /
 921                            UNFM_P_SIZE;
 922                        __u64 blocks_needed;
 923
 924                        RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE,
 925                               "vs-804: invalid position for append");
 926                        /* indirect item has to be appended, set up key of that position */
 927                        make_cpu_key(&tmp_key, inode,
 928                                     le_key_k_offset(version,
 929                                                     &(ih->ih_key)) +
 930                                     op_bytes_number(ih,
 931                                                     inode->i_sb->s_blocksize),
 932                                     //pos_in_item * inode->i_sb->s_blocksize,
 933                                     TYPE_INDIRECT, 3); // key type is unimportant
 934
 935                        RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key),
 936                               "green-805: invalid offset");
 937                        blocks_needed =
 938                            1 +
 939                            ((cpu_key_k_offset(&key) -
 940                              cpu_key_k_offset(&tmp_key)) >> inode->i_sb->
 941                             s_blocksize_bits);
 942
 943                        if (blocks_needed == 1) {
 944                                un = &unf_single;
 945                        } else {
 946                                un = kzalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_NOFS);
 947                                if (!un) {
 948                                        un = &unf_single;
 949                                        blocks_needed = 1;
 950                                        max_to_insert = 0;
 951                                }
 952                        }
 953                        if (blocks_needed <= max_to_insert) {
 954                                /* we are going to add target block to the file. Use allocated
 955                                   block for that */
 956                                un[blocks_needed - 1] =
 957                                    cpu_to_le32(allocated_block_nr);
 958                                set_block_dev_mapped(bh_result,
 959                                                     allocated_block_nr, inode);
 960                                set_buffer_new(bh_result);
 961                                done = 1;
 962                        } else {
 963                                /* paste hole to the indirect item */
 964                                /* If kmalloc failed, max_to_insert becomes zero and it means we
 965                                   only have space for one block */
 966                                blocks_needed =
 967                                    max_to_insert ? max_to_insert : 1;
 968                        }
 969                        retval =
 970                            reiserfs_paste_into_item(th, &path, &tmp_key, inode,
 971                                                     (char *)un,
 972                                                     UNFM_P_SIZE *
 973                                                     blocks_needed);
 974
 975                        if (blocks_needed != 1)
 976                                kfree(un);
 977
 978                        if (retval) {
 979                                reiserfs_free_block(th, inode,
 980                                                    allocated_block_nr, 1);
 981                                goto failure;
 982                        }
 983                        if (!done) {
 984                                /* We need to mark new file size in case this function will be
 985                                   interrupted/aborted later on. And we may do this only for
 986                                   holes. */
 987                                inode->i_size +=
 988                                    inode->i_sb->s_blocksize * blocks_needed;
 989                        }
 990                }
 991
 992                if (done == 1)
 993                        break;
 994
 995                /* this loop could log more blocks than we had originally asked
 996                 ** for.  So, we have to allow the transaction to end if it is
 997                 ** too big or too full.  Update the inode so things are
 998                 ** consistent if we crash before the function returns
 999                 **
1000                 ** release the path so that anybody waiting on the path before
1001                 ** ending their transaction will be able to continue.
1002                 */
1003                if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
1004                        retval = restart_transaction(th, inode, &path);
1005                        if (retval)
1006                                goto failure;
1007                }
1008                /*
1009                 * inserting indirect pointers for a hole can take a
1010                 * long time.  reschedule if needed and also release the write
1011                 * lock for others.
1012                 */
1013                if (need_resched()) {
1014                        reiserfs_write_unlock_once(inode->i_sb, lock_depth);
1015                        schedule();
1016                        lock_depth = reiserfs_write_lock_once(inode->i_sb);
1017                }
1018
1019                retval = search_for_position_by_key(inode->i_sb, &key, &path);
1020                if (retval == IO_ERROR) {
1021                        retval = -EIO;
1022                        goto failure;
1023                }
1024                if (retval == POSITION_FOUND) {
1025                        reiserfs_warning(inode->i_sb, "vs-825",
1026                                         "%K should not be found", &key);
1027                        retval = -EEXIST;
1028                        if (allocated_block_nr)
1029                                reiserfs_free_block(th, inode,
1030                                                    allocated_block_nr, 1);
1031                        pathrelse(&path);
1032                        goto failure;
1033                }
1034                bh = get_last_bh(&path);
1035                ih = get_ih(&path);
1036                item = get_item(&path);
1037                pos_in_item = path.pos_in_item;
1038        } while (1);
1039
1040        retval = 0;
1041
1042      failure:
1043        if (th && (!dangle || (retval && !th->t_trans_id))) {
1044                int err;
1045                if (th->t_trans_id)
1046                        reiserfs_update_sd(th, inode);
1047                err = reiserfs_end_persistent_transaction(th);
1048                if (err)
1049                        retval = err;
1050        }
1051
1052        reiserfs_write_unlock_once(inode->i_sb, lock_depth);
1053        reiserfs_check_path(&path);
1054        return retval;
1055}
1056
1057static int
1058reiserfs_readpages(struct file *file, struct address_space *mapping,
1059                   struct list_head *pages, unsigned nr_pages)
1060{
1061        return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
1062}
1063
1064/* Compute real number of used bytes by file
1065 * Following three functions can go away when we'll have enough space in stat item
1066 */
1067static int real_space_diff(struct inode *inode, int sd_size)
1068{
1069        int bytes;
1070        loff_t blocksize = inode->i_sb->s_blocksize;
1071
1072        if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
1073                return sd_size;
1074
1075        /* End of file is also in full block with indirect reference, so round
1076         ** up to the next block.
1077         **
1078         ** there is just no way to know if the tail is actually packed
1079         ** on the file, so we have to assume it isn't.  When we pack the
1080         ** tail, we add 4 bytes to pretend there really is an unformatted
1081         ** node pointer
1082         */
1083        bytes =
1084            ((inode->i_size +
1085              (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE +
1086            sd_size;
1087        return bytes;
1088}
1089
1090static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
1091                                        int sd_size)
1092{
1093        if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1094                return inode->i_size +
1095                    (loff_t) (real_space_diff(inode, sd_size));
1096        }
1097        return ((loff_t) real_space_diff(inode, sd_size)) +
1098            (((loff_t) blocks) << 9);
1099}
1100
1101/* Compute number of blocks used by file in ReiserFS counting */
1102static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
1103{
1104        loff_t bytes = inode_get_bytes(inode);
1105        loff_t real_space = real_space_diff(inode, sd_size);
1106
1107        /* keeps fsck and non-quota versions of reiserfs happy */
1108        if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1109                bytes += (loff_t) 511;
1110        }
1111
1112        /* files from before the quota patch might i_blocks such that
1113         ** bytes < real_space.  Deal with that here to prevent it from
1114         ** going negative.
1115         */
1116        if (bytes < real_space)
1117                return 0;
1118        return (bytes - real_space) >> 9;
1119}
1120
1121//
1122// BAD: new directories have stat data of new type and all other items
1123// of old type. Version stored in the inode says about body items, so
1124// in update_stat_data we can not rely on inode, but have to check
1125// item version directly
1126//
1127
1128// called by read_locked_inode
1129static void init_inode(struct inode *inode, struct treepath *path)
1130{
1131        struct buffer_head *bh;
1132        struct item_head *ih;
1133        __u32 rdev;
1134        //int version = ITEM_VERSION_1;
1135
1136        bh = PATH_PLAST_BUFFER(path);
1137        ih = PATH_PITEM_HEAD(path);
1138
1139        copy_key(INODE_PKEY(inode), &(ih->ih_key));
1140
1141        INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1142        REISERFS_I(inode)->i_flags = 0;
1143        REISERFS_I(inode)->i_prealloc_block = 0;
1144        REISERFS_I(inode)->i_prealloc_count = 0;
1145        REISERFS_I(inode)->i_trans_id = 0;
1146        REISERFS_I(inode)->i_jl = NULL;
1147        reiserfs_init_xattr_rwsem(inode);
1148
1149        if (stat_data_v1(ih)) {
1150                struct stat_data_v1 *sd =
1151                    (struct stat_data_v1 *)B_I_PITEM(bh, ih);
1152                unsigned long blocks;
1153
1154                set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1155                set_inode_sd_version(inode, STAT_DATA_V1);
1156                inode->i_mode = sd_v1_mode(sd);
1157                set_nlink(inode, sd_v1_nlink(sd));
1158                inode->i_uid = sd_v1_uid(sd);
1159                inode->i_gid = sd_v1_gid(sd);
1160                inode->i_size = sd_v1_size(sd);
1161                inode->i_atime.tv_sec = sd_v1_atime(sd);
1162                inode->i_mtime.tv_sec = sd_v1_mtime(sd);
1163                inode->i_ctime.tv_sec = sd_v1_ctime(sd);
1164                inode->i_atime.tv_nsec = 0;
1165                inode->i_ctime.tv_nsec = 0;
1166                inode->i_mtime.tv_nsec = 0;
1167
1168                inode->i_blocks = sd_v1_blocks(sd);
1169                inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1170                blocks = (inode->i_size + 511) >> 9;
1171                blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
1172                if (inode->i_blocks > blocks) {
1173                        // there was a bug in <=3.5.23 when i_blocks could take negative
1174                        // values. Starting from 3.5.17 this value could even be stored in
1175                        // stat data. For such files we set i_blocks based on file
1176                        // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be
1177                        // only updated if file's inode will ever change
1178                        inode->i_blocks = blocks;
1179                }
1180
1181                rdev = sd_v1_rdev(sd);
1182                REISERFS_I(inode)->i_first_direct_byte =
1183                    sd_v1_first_direct_byte(sd);
1184                /* an early bug in the quota code can give us an odd number for the
1185                 ** block count.  This is incorrect, fix it here.
1186                 */
1187                if (inode->i_blocks & 1) {
1188                        inode->i_blocks++;
1189                }
1190                inode_set_bytes(inode,
1191                                to_real_used_space(inode, inode->i_blocks,
1192                                                   SD_V1_SIZE));
1193                /* nopack is initially zero for v1 objects. For v2 objects,
1194                   nopack is initialised from sd_attrs */
1195                REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
1196        } else {
1197                // new stat data found, but object may have old items
1198                // (directories and symlinks)
1199                struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih);
1200
1201                inode->i_mode = sd_v2_mode(sd);
1202                set_nlink(inode, sd_v2_nlink(sd));
1203                inode->i_uid = sd_v2_uid(sd);
1204                inode->i_size = sd_v2_size(sd);
1205                inode->i_gid = sd_v2_gid(sd);
1206                inode->i_mtime.tv_sec = sd_v2_mtime(sd);
1207                inode->i_atime.tv_sec = sd_v2_atime(sd);
1208                inode->i_ctime.tv_sec = sd_v2_ctime(sd);
1209                inode->i_ctime.tv_nsec = 0;
1210                inode->i_mtime.tv_nsec = 0;
1211                inode->i_atime.tv_nsec = 0;
1212                inode->i_blocks = sd_v2_blocks(sd);
1213                rdev = sd_v2_rdev(sd);
1214                if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1215                        inode->i_generation =
1216                            le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1217                else
1218                        inode->i_generation = sd_v2_generation(sd);
1219
1220                if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1221                        set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1222                else
1223                        set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1224                REISERFS_I(inode)->i_first_direct_byte = 0;
1225                set_inode_sd_version(inode, STAT_DATA_V2);
1226                inode_set_bytes(inode,
1227                                to_real_used_space(inode, inode->i_blocks,
1228                                                   SD_V2_SIZE));
1229                /* read persistent inode attributes from sd and initialise
1230                   generic inode flags from them */
1231                REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
1232                sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
1233        }
1234
1235        pathrelse(path);
1236        if (S_ISREG(inode->i_mode)) {
1237                inode->i_op = &reiserfs_file_inode_operations;
1238                inode->i_fop = &reiserfs_file_operations;
1239                inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1240        } else if (S_ISDIR(inode->i_mode)) {
1241                inode->i_op = &reiserfs_dir_inode_operations;
1242                inode->i_fop = &reiserfs_dir_operations;
1243        } else if (S_ISLNK(inode->i_mode)) {
1244                inode->i_op = &reiserfs_symlink_inode_operations;
1245                inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1246        } else {
1247                inode->i_blocks = 0;
1248                inode->i_op = &reiserfs_special_inode_operations;
1249                init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
1250        }
1251}
1252
1253// update new stat data with inode fields
1254static void inode2sd(void *sd, struct inode *inode, loff_t size)
1255{
1256        struct stat_data *sd_v2 = (struct stat_data *)sd;
1257        __u16 flags;
1258
1259        set_sd_v2_mode(sd_v2, inode->i_mode);
1260        set_sd_v2_nlink(sd_v2, inode->i_nlink);
1261        set_sd_v2_uid(sd_v2, inode->i_uid);
1262        set_sd_v2_size(sd_v2, size);
1263        set_sd_v2_gid(sd_v2, inode->i_gid);
1264        set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec);
1265        set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec);
1266        set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec);
1267        set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE));
1268        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1269                set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev));
1270        else
1271                set_sd_v2_generation(sd_v2, inode->i_generation);
1272        flags = REISERFS_I(inode)->i_attrs;
1273        i_attrs_to_sd_attrs(inode, &flags);
1274        set_sd_v2_attrs(sd_v2, flags);
1275}
1276
1277// used to copy inode's fields to old stat data
1278static void inode2sd_v1(void *sd, struct inode *inode, loff_t size)
1279{
1280        struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd;
1281
1282        set_sd_v1_mode(sd_v1, inode->i_mode);
1283        set_sd_v1_uid(sd_v1, inode->i_uid);
1284        set_sd_v1_gid(sd_v1, inode->i_gid);
1285        set_sd_v1_nlink(sd_v1, inode->i_nlink);
1286        set_sd_v1_size(sd_v1, size);
1287        set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec);
1288        set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec);
1289        set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec);
1290
1291        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1292                set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
1293        else
1294                set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
1295
1296        // Sigh. i_first_direct_byte is back
1297        set_sd_v1_first_direct_byte(sd_v1,
1298                                    REISERFS_I(inode)->i_first_direct_byte);
1299}
1300
1301/* NOTE, you must prepare the buffer head before sending it here,
1302** and then log it after the call
1303*/
1304static void update_stat_data(struct treepath *path, struct inode *inode,
1305                             loff_t size)
1306{
1307        struct buffer_head *bh;
1308        struct item_head *ih;
1309
1310        bh = PATH_PLAST_BUFFER(path);
1311        ih = PATH_PITEM_HEAD(path);
1312
1313        if (!is_statdata_le_ih(ih))
1314                reiserfs_panic(inode->i_sb, "vs-13065", "key %k, found item %h",
1315                               INODE_PKEY(inode), ih);
1316
1317        if (stat_data_v1(ih)) {
1318                // path points to old stat data
1319                inode2sd_v1(B_I_PITEM(bh, ih), inode, size);
1320        } else {
1321                inode2sd(B_I_PITEM(bh, ih), inode, size);
1322        }
1323
1324        return;
1325}
1326
1327void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
1328                             struct inode *inode, loff_t size)
1329{
1330        struct cpu_key key;
1331        INITIALIZE_PATH(path);
1332        struct buffer_head *bh;
1333        int fs_gen;
1334        struct item_head *ih, tmp_ih;
1335        int retval;
1336
1337        BUG_ON(!th->t_trans_id);
1338
1339        make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3);        //key type is unimportant
1340
1341        for (;;) {
1342                int pos;
1343                /* look for the object's stat data */
1344                retval = search_item(inode->i_sb, &key, &path);
1345                if (retval == IO_ERROR) {
1346                        reiserfs_error(inode->i_sb, "vs-13050",
1347                                       "i/o failure occurred trying to "
1348                                       "update %K stat data", &key);
1349                        return;
1350                }
1351                if (retval == ITEM_NOT_FOUND) {
1352                        pos = PATH_LAST_POSITION(&path);
1353                        pathrelse(&path);
1354                        if (inode->i_nlink == 0) {
1355                                /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */
1356                                return;
1357                        }
1358                        reiserfs_warning(inode->i_sb, "vs-13060",
1359                                         "stat data of object %k (nlink == %d) "
1360                                         "not found (pos %d)",
1361                                         INODE_PKEY(inode), inode->i_nlink,
1362                                         pos);
1363                        reiserfs_check_path(&path);
1364                        return;
1365                }
1366
1367                /* sigh, prepare_for_journal might schedule.  When it schedules the
1368                 ** FS might change.  We have to detect that, and loop back to the
1369                 ** search if the stat data item has moved
1370                 */
1371                bh = get_last_bh(&path);
1372                ih = get_ih(&path);
1373                copy_item_head(&tmp_ih, ih);
1374                fs_gen = get_generation(inode->i_sb);
1375                reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
1376                if (fs_changed(fs_gen, inode->i_sb)
1377                    && item_moved(&tmp_ih, &path)) {
1378                        reiserfs_restore_prepared_buffer(inode->i_sb, bh);
1379                        continue;       /* Stat_data item has been moved after scheduling. */
1380                }
1381                break;
1382        }
1383        update_stat_data(&path, inode, size);
1384        journal_mark_dirty(th, th->t_super, bh);
1385        pathrelse(&path);
1386        return;
1387}
1388
1389/* reiserfs_read_locked_inode is called to read the inode off disk, and it
1390** does a make_bad_inode when things go wrong.  But, we need to make sure
1391** and clear the key in the private portion of the inode, otherwise a
1392** corresponding iput might try to delete whatever object the inode last
1393** represented.
1394*/
1395static void reiserfs_make_bad_inode(struct inode *inode)
1396{
1397        memset(INODE_PKEY(inode), 0, KEY_SIZE);
1398        make_bad_inode(inode);
1399}
1400
1401//
1402// initially this function was derived from minix or ext2's analog and
1403// evolved as the prototype did
1404//
1405
1406int reiserfs_init_locked_inode(struct inode *inode, void *p)
1407{
1408        struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p;
1409        inode->i_ino = args->objectid;
1410        INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
1411        return 0;
1412}
1413
1414/* looks for stat data in the tree, and fills up the fields of in-core
1415   inode stat data fields */
1416void reiserfs_read_locked_inode(struct inode *inode,
1417                                struct reiserfs_iget_args *args)
1418{
1419        INITIALIZE_PATH(path_to_sd);
1420        struct cpu_key key;
1421        unsigned long dirino;
1422        int retval;
1423
1424        dirino = args->dirid;
1425
1426        /* set version 1, version 2 could be used too, because stat data
1427           key is the same in both versions */
1428        key.version = KEY_FORMAT_3_5;
1429        key.on_disk_key.k_dir_id = dirino;
1430        key.on_disk_key.k_objectid = inode->i_ino;
1431        key.on_disk_key.k_offset = 0;
1432        key.on_disk_key.k_type = 0;
1433
1434        /* look for the object's stat data */
1435        retval = search_item(inode->i_sb, &key, &path_to_sd);
1436        if (retval == IO_ERROR) {
1437                reiserfs_error(inode->i_sb, "vs-13070",
1438                               "i/o failure occurred trying to find "
1439                               "stat data of %K", &key);
1440                reiserfs_make_bad_inode(inode);
1441                return;
1442        }
1443        if (retval != ITEM_FOUND) {
1444                /* a stale NFS handle can trigger this without it being an error */
1445                pathrelse(&path_to_sd);
1446                reiserfs_make_bad_inode(inode);
1447                clear_nlink(inode);
1448                return;
1449        }
1450
1451        init_inode(inode, &path_to_sd);
1452
1453        /* It is possible that knfsd is trying to access inode of a file
1454           that is being removed from the disk by some other thread. As we
1455           update sd on unlink all that is required is to check for nlink
1456           here. This bug was first found by Sizif when debugging
1457           SquidNG/Butterfly, forgotten, and found again after Philippe
1458           Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
1459
1460           More logical fix would require changes in fs/inode.c:iput() to
1461           remove inode from hash-table _after_ fs cleaned disk stuff up and
1462           in iget() to return NULL if I_FREEING inode is found in
1463           hash-table. */
1464        /* Currently there is one place where it's ok to meet inode with
1465           nlink==0: processing of open-unlinked and half-truncated files
1466           during mount (fs/reiserfs/super.c:finish_unfinished()). */
1467        if ((inode->i_nlink == 0) &&
1468            !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
1469                reiserfs_warning(inode->i_sb, "vs-13075",
1470                                 "dead inode read from disk %K. "
1471                                 "This is likely to be race with knfsd. Ignore",
1472                                 &key);
1473                reiserfs_make_bad_inode(inode);
1474        }
1475
1476        reiserfs_check_path(&path_to_sd);       /* init inode should be relsing */
1477
1478        /*
1479         * Stat data v1 doesn't support ACLs.
1480         */
1481        if (get_inode_sd_version(inode) == STAT_DATA_V1)
1482                cache_no_acl(inode);
1483}
1484
1485/**
1486 * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
1487 *
1488 * @inode:    inode from hash table to check
1489 * @opaque:   "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
1490 *
1491 * This function is called by iget5_locked() to distinguish reiserfs inodes
1492 * having the same inode numbers. Such inodes can only exist due to some
1493 * error condition. One of them should be bad. Inodes with identical
1494 * inode numbers (objectids) are distinguished by parent directory ids.
1495 *
1496 */
1497int reiserfs_find_actor(struct inode *inode, void *opaque)
1498{
1499        struct reiserfs_iget_args *args;
1500
1501        args = opaque;
1502        /* args is already in CPU order */
1503        return (inode->i_ino == args->objectid) &&
1504            (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
1505}
1506
1507struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
1508{
1509        struct inode *inode;
1510        struct reiserfs_iget_args args;
1511
1512        args.objectid = key->on_disk_key.k_objectid;
1513        args.dirid = key->on_disk_key.k_dir_id;
1514        reiserfs_write_unlock(s);
1515        inode = iget5_locked(s, key->on_disk_key.k_objectid,
1516                             reiserfs_find_actor, reiserfs_init_locked_inode,
1517                             (void *)(&args));
1518        reiserfs_write_lock(s);
1519        if (!inode)
1520                return ERR_PTR(-ENOMEM);
1521
1522        if (inode->i_state & I_NEW) {
1523                reiserfs_read_locked_inode(inode, &args);
1524                unlock_new_inode(inode);
1525        }
1526
1527        if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
1528                /* either due to i/o error or a stale NFS handle */
1529                iput(inode);
1530                inode = NULL;
1531        }
1532        return inode;
1533}
1534
1535static struct dentry *reiserfs_get_dentry(struct super_block *sb,
1536        u32 objectid, u32 dir_id, u32 generation)
1537
1538{
1539        struct cpu_key key;
1540        struct inode *inode;
1541
1542        key.on_disk_key.k_objectid = objectid;
1543        key.on_disk_key.k_dir_id = dir_id;
1544        reiserfs_write_lock(sb);
1545        inode = reiserfs_iget(sb, &key);
1546        if (inode && !IS_ERR(inode) && generation != 0 &&
1547            generation != inode->i_generation) {
1548                iput(inode);
1549                inode = NULL;
1550        }
1551        reiserfs_write_unlock(sb);
1552
1553        return d_obtain_alias(inode);
1554}
1555
1556struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1557                int fh_len, int fh_type)
1558{
1559        /* fhtype happens to reflect the number of u32s encoded.
1560         * due to a bug in earlier code, fhtype might indicate there
1561         * are more u32s then actually fitted.
1562         * so if fhtype seems to be more than len, reduce fhtype.
1563         * Valid types are:
1564         *   2 - objectid + dir_id - legacy support
1565         *   3 - objectid + dir_id + generation
1566         *   4 - objectid + dir_id + objectid and dirid of parent - legacy
1567         *   5 - objectid + dir_id + generation + objectid and dirid of parent
1568         *   6 - as above plus generation of directory
1569         * 6 does not fit in NFSv2 handles
1570         */
1571        if (fh_type > fh_len) {
1572                if (fh_type != 6 || fh_len != 5)
1573                        reiserfs_warning(sb, "reiserfs-13077",
1574                                "nfsd/reiserfs, fhtype=%d, len=%d - odd",
1575                                fh_type, fh_len);
1576                fh_type = 5;
1577        }
1578
1579        return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
1580                (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
1581}
1582
1583struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1584                int fh_len, int fh_type)
1585{
1586        if (fh_type < 4)
1587                return NULL;
1588
1589        return reiserfs_get_dentry(sb,
1590                (fh_type >= 5) ? fid->raw[3] : fid->raw[2],
1591                (fh_type >= 5) ? fid->raw[4] : fid->raw[3],
1592                (fh_type == 6) ? fid->raw[5] : 0);
1593}
1594
1595int reiserfs_encode_fh(struct inode *inode, __u32 * data, int *lenp,
1596                       struct inode *parent)
1597{
1598        int maxlen = *lenp;
1599
1600        if (parent && (maxlen < 5)) {
1601                *lenp = 5;
1602                return 255;
1603        } else if (maxlen < 3) {
1604                *lenp = 3;
1605                return 255;
1606        }
1607
1608        data[0] = inode->i_ino;
1609        data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1610        data[2] = inode->i_generation;
1611        *lenp = 3;
1612        if (parent) {
1613                data[3] = parent->i_ino;
1614                data[4] = le32_to_cpu(INODE_PKEY(parent)->k_dir_id);
1615                *lenp = 5;
1616                if (maxlen >= 6) {
1617                        data[5] = parent->i_generation;
1618                        *lenp = 6;
1619                }
1620        }
1621        return *lenp;
1622}
1623
1624/* looks for stat data, then copies fields to it, marks the buffer
1625   containing stat data as dirty */
1626/* reiserfs inodes are never really dirty, since the dirty inode call
1627** always logs them.  This call allows the VFS inode marking routines
1628** to properly mark inodes for datasync and such, but only actually
1629** does something when called for a synchronous update.
1630*/
1631int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1632{
1633        struct reiserfs_transaction_handle th;
1634        int jbegin_count = 1;
1635
1636        if (inode->i_sb->s_flags & MS_RDONLY)
1637                return -EROFS;
1638        /* memory pressure can sometimes initiate write_inode calls with sync == 1,
1639         ** these cases are just when the system needs ram, not when the
1640         ** inode needs to reach disk for safety, and they can safely be
1641         ** ignored because the altered inode has already been logged.
1642         */
1643        if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) {
1644                reiserfs_write_lock(inode->i_sb);
1645                if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
1646                        reiserfs_update_sd(&th, inode);
1647                        journal_end_sync(&th, inode->i_sb, jbegin_count);
1648                }
1649                reiserfs_write_unlock(inode->i_sb);
1650        }
1651        return 0;
1652}
1653
1654/* stat data of new object is inserted already, this inserts the item
1655   containing "." and ".." entries */
1656static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
1657                                  struct inode *inode,
1658                                  struct item_head *ih, struct treepath *path,
1659                                  struct inode *dir)
1660{
1661        struct super_block *sb = th->t_super;
1662        char empty_dir[EMPTY_DIR_SIZE];
1663        char *body = empty_dir;
1664        struct cpu_key key;
1665        int retval;
1666
1667        BUG_ON(!th->t_trans_id);
1668
1669        _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
1670                      le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
1671                      TYPE_DIRENTRY, 3 /*key length */ );
1672
1673        /* compose item head for new item. Directories consist of items of
1674           old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
1675           is done by reiserfs_new_inode */
1676        if (old_format_only(sb)) {
1677                make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1678                                  TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
1679
1680                make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
1681                                       ih->ih_key.k_objectid,
1682                                       INODE_PKEY(dir)->k_dir_id,
1683                                       INODE_PKEY(dir)->k_objectid);
1684        } else {
1685                make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1686                                  TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
1687
1688                make_empty_dir_item(body, ih->ih_key.k_dir_id,
1689                                    ih->ih_key.k_objectid,
1690                                    INODE_PKEY(dir)->k_dir_id,
1691                                    INODE_PKEY(dir)->k_objectid);
1692        }
1693
1694        /* look for place in the tree for new item */
1695        retval = search_item(sb, &key, path);
1696        if (retval == IO_ERROR) {
1697                reiserfs_error(sb, "vs-13080",
1698                               "i/o failure occurred creating new directory");
1699                return -EIO;
1700        }
1701        if (retval == ITEM_FOUND) {
1702                pathrelse(path);
1703                reiserfs_warning(sb, "vs-13070",
1704                                 "object with this key exists (%k)",
1705                                 &(ih->ih_key));
1706                return -EEXIST;
1707        }
1708
1709        /* insert item, that is empty directory item */
1710        return reiserfs_insert_item(th, path, &key, ih, inode, body);
1711}
1712
1713/* stat data of object has been inserted, this inserts the item
1714   containing the body of symlink */
1715static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode,    /* Inode of symlink */
1716                                struct item_head *ih,
1717                                struct treepath *path, const char *symname,
1718                                int item_len)
1719{
1720        struct super_block *sb = th->t_super;
1721        struct cpu_key key;
1722        int retval;
1723
1724        BUG_ON(!th->t_trans_id);
1725
1726        _make_cpu_key(&key, KEY_FORMAT_3_5,
1727                      le32_to_cpu(ih->ih_key.k_dir_id),
1728                      le32_to_cpu(ih->ih_key.k_objectid),
1729                      1, TYPE_DIRECT, 3 /*key length */ );
1730
1731        make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
1732                          0 /*free_space */ );
1733
1734        /* look for place in the tree for new item */
1735        retval = search_item(sb, &key, path);
1736        if (retval == IO_ERROR) {
1737                reiserfs_error(sb, "vs-13080",
1738                               "i/o failure occurred creating new symlink");
1739                return -EIO;
1740        }
1741        if (retval == ITEM_FOUND) {
1742                pathrelse(path);
1743                reiserfs_warning(sb, "vs-13080",
1744                                 "object with this key exists (%k)",
1745                                 &(ih->ih_key));
1746                return -EEXIST;
1747        }
1748
1749        /* insert item, that is body of symlink */
1750        return reiserfs_insert_item(th, path, &key, ih, inode, symname);
1751}
1752
1753/* inserts the stat data into the tree, and then calls
1754   reiserfs_new_directory (to insert ".", ".." item if new object is
1755   directory) or reiserfs_new_symlink (to insert symlink body if new
1756   object is symlink) or nothing (if new object is regular file)
1757
1758   NOTE! uid and gid must already be set in the inode.  If we return
1759   non-zero due to an error, we have to drop the quota previously allocated
1760   for the fresh inode.  This can only be done outside a transaction, so
1761   if we return non-zero, we also end the transaction.  */
1762int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1763                       struct inode *dir, umode_t mode, const char *symname,
1764                       /* 0 for regular, EMTRY_DIR_SIZE for dirs,
1765                          strlen (symname) for symlinks) */
1766                       loff_t i_size, struct dentry *dentry,
1767                       struct inode *inode,
1768                       struct reiserfs_security_handle *security)
1769{
1770        struct super_block *sb;
1771        struct reiserfs_iget_args args;
1772        INITIALIZE_PATH(path_to_key);
1773        struct cpu_key key;
1774        struct item_head ih;
1775        struct stat_data sd;
1776        int retval;
1777        int err;
1778
1779        BUG_ON(!th->t_trans_id);
1780
1781        dquot_initialize(inode);
1782        err = dquot_alloc_inode(inode);
1783        if (err)
1784                goto out_end_trans;
1785        if (!dir->i_nlink) {
1786                err = -EPERM;
1787                goto out_bad_inode;
1788        }
1789
1790        sb = dir->i_sb;
1791
1792        /* item head of new item */
1793        ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
1794        ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
1795        if (!ih.ih_key.k_objectid) {
1796                err = -ENOMEM;
1797                goto out_bad_inode;
1798        }
1799        args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
1800        if (old_format_only(sb))
1801                make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
1802                                  TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
1803        else
1804                make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
1805                                  TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
1806        memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
1807        args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
1808        if (insert_inode_locked4(inode, args.objectid,
1809                             reiserfs_find_actor, &args) < 0) {
1810                err = -EINVAL;
1811                goto out_bad_inode;
1812        }
1813        if (old_format_only(sb))
1814                /* not a perfect generation count, as object ids can be reused, but
1815                 ** this is as good as reiserfs can do right now.
1816                 ** note that the private part of inode isn't filled in yet, we have
1817                 ** to use the directory.
1818                 */
1819                inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
1820        else
1821#if defined( USE_INODE_GENERATION_COUNTER )
1822                inode->i_generation =
1823                    le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
1824#else
1825                inode->i_generation = ++event;
1826#endif
1827
1828        /* fill stat data */
1829        set_nlink(inode, (S_ISDIR(mode) ? 2 : 1));
1830
1831        /* uid and gid must already be set by the caller for quota init */
1832
1833        /* symlink cannot be immutable or append only, right? */
1834        if (S_ISLNK(inode->i_mode))
1835                inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
1836
1837        inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1838        inode->i_size = i_size;
1839        inode->i_blocks = 0;
1840        inode->i_bytes = 0;
1841        REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
1842            U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
1843
1844        INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1845        REISERFS_I(inode)->i_flags = 0;
1846        REISERFS_I(inode)->i_prealloc_block = 0;
1847        REISERFS_I(inode)->i_prealloc_count = 0;
1848        REISERFS_I(inode)->i_trans_id = 0;
1849        REISERFS_I(inode)->i_jl = NULL;
1850        REISERFS_I(inode)->i_attrs =
1851            REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
1852        sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
1853        reiserfs_init_xattr_rwsem(inode);
1854
1855        /* key to search for correct place for new stat data */
1856        _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
1857                      le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
1858                      TYPE_STAT_DATA, 3 /*key length */ );
1859
1860        /* find proper place for inserting of stat data */
1861        retval = search_item(sb, &key, &path_to_key);
1862        if (retval == IO_ERROR) {
1863                err = -EIO;
1864                goto out_bad_inode;
1865        }
1866        if (retval == ITEM_FOUND) {
1867                pathrelse(&path_to_key);
1868                err = -EEXIST;
1869                goto out_bad_inode;
1870        }
1871        if (old_format_only(sb)) {
1872                if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
1873                        pathrelse(&path_to_key);
1874                        /* i_uid or i_gid is too big to be stored in stat data v3.5 */
1875                        err = -EINVAL;
1876                        goto out_bad_inode;
1877                }
1878                inode2sd_v1(&sd, inode, inode->i_size);
1879        } else {
1880                inode2sd(&sd, inode, inode->i_size);
1881        }
1882        // store in in-core inode the key of stat data and version all
1883        // object items will have (directory items will have old offset
1884        // format, other new objects will consist of new items)
1885        if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
1886                set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1887        else
1888                set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1889        if (old_format_only(sb))
1890                set_inode_sd_version(inode, STAT_DATA_V1);
1891        else
1892                set_inode_sd_version(inode, STAT_DATA_V2);
1893
1894        /* insert the stat data into the tree */
1895#ifdef DISPLACE_NEW_PACKING_LOCALITIES
1896        if (REISERFS_I(dir)->new_packing_locality)
1897                th->displace_new_blocks = 1;
1898#endif
1899        retval =
1900            reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
1901                                 (char *)(&sd));
1902        if (retval) {
1903                err = retval;
1904                reiserfs_check_path(&path_to_key);
1905                goto out_bad_inode;
1906        }
1907#ifdef DISPLACE_NEW_PACKING_LOCALITIES
1908        if (!th->displace_new_blocks)
1909                REISERFS_I(dir)->new_packing_locality = 0;
1910#endif
1911        if (S_ISDIR(mode)) {
1912                /* insert item with "." and ".." */
1913                retval =
1914                    reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
1915        }
1916
1917        if (S_ISLNK(mode)) {
1918                /* insert body of symlink */
1919                if (!old_format_only(sb))
1920                        i_size = ROUND_UP(i_size);
1921                retval =
1922                    reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
1923                                         i_size);
1924        }
1925        if (retval) {
1926                err = retval;
1927                reiserfs_check_path(&path_to_key);
1928                journal_end(th, th->t_super, th->t_blocks_allocated);
1929                goto out_inserted_sd;
1930        }
1931
1932        if (reiserfs_posixacl(inode->i_sb)) {
1933                retval = reiserfs_inherit_default_acl(th, dir, dentry, inode);
1934                if (retval) {
1935                        err = retval;
1936                        reiserfs_check_path(&path_to_key);
1937                        journal_end(th, th->t_super, th->t_blocks_allocated);
1938                        goto out_inserted_sd;
1939                }
1940        } else if (inode->i_sb->s_flags & MS_POSIXACL) {
1941                reiserfs_warning(inode->i_sb, "jdm-13090",
1942                                 "ACLs aren't enabled in the fs, "
1943                                 "but vfs thinks they are!");
1944        } else if (IS_PRIVATE(dir))
1945                inode->i_flags |= S_PRIVATE;
1946
1947        if (security->name) {
1948                retval = reiserfs_security_write(th, inode, security);
1949                if (retval) {
1950                        err = retval;
1951                        reiserfs_check_path(&path_to_key);
1952                        retval = journal_end(th, th->t_super,
1953                                             th->t_blocks_allocated);
1954                        if (retval)
1955                                err = retval;
1956                        goto out_inserted_sd;
1957                }
1958        }
1959
1960        reiserfs_update_sd(th, inode);
1961        reiserfs_check_path(&path_to_key);
1962
1963        return 0;
1964
1965/* it looks like you can easily compress these two goto targets into
1966 * one.  Keeping it like this doesn't actually hurt anything, and they
1967 * are place holders for what the quota code actually needs.
1968 */
1969      out_bad_inode:
1970        /* Invalidate the object, nothing was inserted yet */
1971        INODE_PKEY(inode)->k_objectid = 0;
1972
1973        /* Quota change must be inside a transaction for journaling */
1974        dquot_free_inode(inode);
1975
1976      out_end_trans:
1977        journal_end(th, th->t_super, th->t_blocks_allocated);
1978        /* Drop can be outside and it needs more credits so it's better to have it outside */
1979        dquot_drop(inode);
1980        inode->i_flags |= S_NOQUOTA;
1981        make_bad_inode(inode);
1982
1983      out_inserted_sd:
1984        clear_nlink(inode);
1985        th->t_trans_id = 0;     /* so the caller can't use this handle later */
1986        unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
1987        iput(inode);
1988        return err;
1989}
1990
1991/*
1992** finds the tail page in the page cache,
1993** reads the last block in.
1994**
1995** On success, page_result is set to a locked, pinned page, and bh_result
1996** is set to an up to date buffer for the last block in the file.  returns 0.
1997**
1998** tail conversion is not done, so bh_result might not be valid for writing
1999** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
2000** trying to write the block.
2001**
2002** on failure, nonzero is returned, page_result and bh_result are untouched.
2003*/
2004static int grab_tail_page(struct inode *inode,
2005                          struct page **page_result,
2006                          struct buffer_head **bh_result)
2007{
2008
2009        /* we want the page with the last byte in the file,
2010         ** not the page that will hold the next byte for appending
2011         */
2012        unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
2013        unsigned long pos = 0;
2014        unsigned long start = 0;
2015        unsigned long blocksize = inode->i_sb->s_blocksize;
2016        unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1);
2017        struct buffer_head *bh;
2018        struct buffer_head *head;
2019        struct page *page;
2020        int error;
2021
2022        /* we know that we are only called with inode->i_size > 0.
2023         ** we also know that a file tail can never be as big as a block
2024         ** If i_size % blocksize == 0, our file is currently block aligned
2025         ** and it won't need converting or zeroing after a truncate.
2026         */
2027        if ((offset & (blocksize - 1)) == 0) {
2028                return -ENOENT;
2029        }
2030        page = grab_cache_page(inode->i_mapping, index);
2031        error = -ENOMEM;
2032        if (!page) {
2033                goto out;
2034        }
2035        /* start within the page of the last block in the file */
2036        start = (offset / blocksize) * blocksize;
2037
2038        error = __block_write_begin(page, start, offset - start,
2039                                    reiserfs_get_block_create_0);
2040        if (error)
2041                goto unlock;
2042
2043        head = page_buffers(page);
2044        bh = head;
2045        do {
2046                if (pos >= start) {
2047                        break;
2048                }
2049                bh = bh->b_this_page;
2050                pos += blocksize;
2051        } while (bh != head);
2052
2053        if (!buffer_uptodate(bh)) {
2054                /* note, this should never happen, prepare_write should
2055                 ** be taking care of this for us.  If the buffer isn't up to date,
2056                 ** I've screwed up the code to find the buffer, or the code to
2057                 ** call prepare_write
2058                 */
2059                reiserfs_error(inode->i_sb, "clm-6000",
2060                               "error reading block %lu", bh->b_blocknr);
2061                error = -EIO;
2062                goto unlock;
2063        }
2064        *bh_result = bh;
2065        *page_result = page;
2066
2067      out:
2068        return error;
2069
2070      unlock:
2071        unlock_page(page);
2072        page_cache_release(page);
2073        return error;
2074}
2075
2076/*
2077** vfs version of truncate file.  Must NOT be called with
2078** a transaction already started.
2079**
2080** some code taken from block_truncate_page
2081*/
2082int reiserfs_truncate_file(struct inode *inode, int update_timestamps)
2083{
2084        struct reiserfs_transaction_handle th;
2085        /* we want the offset for the first byte after the end of the file */
2086        unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2087        unsigned blocksize = inode->i_sb->s_blocksize;
2088        unsigned length;
2089        struct page *page = NULL;
2090        int error;
2091        struct buffer_head *bh = NULL;
2092        int err2;
2093        int lock_depth;
2094
2095        lock_depth = reiserfs_write_lock_once(inode->i_sb);
2096
2097        if (inode->i_size > 0) {
2098                error = grab_tail_page(inode, &page, &bh);
2099                if (error) {
2100                        // -ENOENT means we truncated past the end of the file,
2101                        // and get_block_create_0 could not find a block to read in,
2102                        // which is ok.
2103                        if (error != -ENOENT)
2104                                reiserfs_error(inode->i_sb, "clm-6001",
2105                                               "grab_tail_page failed %d",
2106                                               error);
2107                        page = NULL;
2108                        bh = NULL;
2109                }
2110        }
2111
2112        /* so, if page != NULL, we have a buffer head for the offset at
2113         ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
2114         ** then we have an unformatted node.  Otherwise, we have a direct item,
2115         ** and no zeroing is required on disk.  We zero after the truncate,
2116         ** because the truncate might pack the item anyway
2117         ** (it will unmap bh if it packs).
2118         */
2119        /* it is enough to reserve space in transaction for 2 balancings:
2120           one for "save" link adding and another for the first
2121           cut_from_item. 1 is for update_sd */
2122        error = journal_begin(&th, inode->i_sb,
2123                              JOURNAL_PER_BALANCE_CNT * 2 + 1);
2124        if (error)
2125                goto out;
2126        reiserfs_update_inode_transaction(inode);
2127        if (update_timestamps)
2128                /* we are doing real truncate: if the system crashes before the last
2129                   transaction of truncating gets committed - on reboot the file
2130                   either appears truncated properly or not truncated at all */
2131                add_save_link(&th, inode, 1);
2132        err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps);
2133        error =
2134            journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
2135        if (error)
2136                goto out;
2137
2138        /* check reiserfs_do_truncate after ending the transaction */
2139        if (err2) {
2140                error = err2;
2141                goto out;
2142        }
2143        
2144        if (update_timestamps) {
2145                error = remove_save_link(inode, 1 /* truncate */);
2146                if (error)
2147                        goto out;
2148        }
2149
2150        if (page) {
2151                length = offset & (blocksize - 1);
2152                /* if we are not on a block boundary */
2153                if (length) {
2154                        length = blocksize - length;
2155                        zero_user(page, offset, length);
2156                        if (buffer_mapped(bh) && bh->b_blocknr != 0) {
2157                                mark_buffer_dirty(bh);
2158                        }
2159                }
2160                unlock_page(page);
2161                page_cache_release(page);
2162        }
2163
2164        reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2165
2166        return 0;
2167      out:
2168        if (page) {
2169                unlock_page(page);
2170                page_cache_release(page);
2171        }
2172
2173        reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2174
2175        return error;
2176}
2177
2178static int map_block_for_writepage(struct inode *inode,
2179                                   struct buffer_head *bh_result,
2180                                   unsigned long block)
2181{
2182        struct reiserfs_transaction_handle th;
2183        int fs_gen;
2184        struct item_head tmp_ih;
2185        struct item_head *ih;
2186        struct buffer_head *bh;
2187        __le32 *item;
2188        struct cpu_key key;
2189        INITIALIZE_PATH(path);
2190        int pos_in_item;
2191        int jbegin_count = JOURNAL_PER_BALANCE_CNT;
2192        loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
2193        int retval;
2194        int use_get_block = 0;
2195        int bytes_copied = 0;
2196        int copy_size;
2197        int trans_running = 0;
2198
2199        /* catch places below that try to log something without starting a trans */
2200        th.t_trans_id = 0;
2201
2202        if (!buffer_uptodate(bh_result)) {
2203                return -EIO;
2204        }
2205
2206        kmap(bh_result->b_page);
2207      start_over:
2208        reiserfs_write_lock(inode->i_sb);
2209        make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
2210
2211      research:
2212        retval = search_for_position_by_key(inode->i_sb, &key, &path);
2213        if (retval != POSITION_FOUND) {
2214                use_get_block = 1;
2215                goto out;
2216        }
2217
2218        bh = get_last_bh(&path);
2219        ih = get_ih(&path);
2220        item = get_item(&path);
2221        pos_in_item = path.pos_in_item;
2222
2223        /* we've found an unformatted node */
2224        if (indirect_item_found(retval, ih)) {
2225                if (bytes_copied > 0) {
2226                        reiserfs_warning(inode->i_sb, "clm-6002",
2227                                         "bytes_copied %d", bytes_copied);
2228                }
2229                if (!get_block_num(item, pos_in_item)) {
2230                        /* crap, we are writing to a hole */
2231                        use_get_block = 1;
2232                        goto out;
2233                }
2234                set_block_dev_mapped(bh_result,
2235                                     get_block_num(item, pos_in_item), inode);
2236        } else if (is_direct_le_ih(ih)) {
2237                char *p;
2238                p = page_address(bh_result->b_page);
2239                p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
2240                copy_size = ih_item_len(ih) - pos_in_item;
2241
2242                fs_gen = get_generation(inode->i_sb);
2243                copy_item_head(&tmp_ih, ih);
2244
2245                if (!trans_running) {
2246                        /* vs-3050 is gone, no need to drop the path */
2247                        retval = journal_begin(&th, inode->i_sb, jbegin_count);
2248                        if (retval)
2249                                goto out;
2250                        reiserfs_update_inode_transaction(inode);
2251                        trans_running = 1;
2252                        if (fs_changed(fs_gen, inode->i_sb)
2253                            && item_moved(&tmp_ih, &path)) {
2254                                reiserfs_restore_prepared_buffer(inode->i_sb,
2255                                                                 bh);
2256                                goto research;
2257                        }
2258                }
2259
2260                reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
2261
2262                if (fs_changed(fs_gen, inode->i_sb)
2263                    && item_moved(&tmp_ih, &path)) {
2264                        reiserfs_restore_prepared_buffer(inode->i_sb, bh);
2265                        goto research;
2266                }
2267
2268                memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied,
2269                       copy_size);
2270
2271                journal_mark_dirty(&th, inode->i_sb, bh);
2272                bytes_copied += copy_size;
2273                set_block_dev_mapped(bh_result, 0, inode);
2274
2275                /* are there still bytes left? */
2276                if (bytes_copied < bh_result->b_size &&
2277                    (byte_offset + bytes_copied) < inode->i_size) {
2278                        set_cpu_key_k_offset(&key,
2279                                             cpu_key_k_offset(&key) +
2280                                             copy_size);
2281                        goto research;
2282                }
2283        } else {
2284                reiserfs_warning(inode->i_sb, "clm-6003",
2285                                 "bad item inode %lu", inode->i_ino);
2286                retval = -EIO;
2287                goto out;
2288        }
2289        retval = 0;
2290
2291      out:
2292        pathrelse(&path);
2293        if (trans_running) {
2294                int err = journal_end(&th, inode->i_sb, jbegin_count);
2295                if (err)
2296                        retval = err;
2297                trans_running = 0;
2298        }
2299        reiserfs_write_unlock(inode->i_sb);
2300
2301        /* this is where we fill in holes in the file. */
2302        if (use_get_block) {
2303                retval = reiserfs_get_block(inode, block, bh_result,
2304                                            GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
2305                                            | GET_BLOCK_NO_DANGLE);
2306                if (!retval) {
2307                        if (!buffer_mapped(bh_result)
2308                            || bh_result->b_blocknr == 0) {
2309                                /* get_block failed to find a mapped unformatted node. */
2310                                use_get_block = 0;
2311                                goto start_over;
2312                        }
2313                }
2314        }
2315        kunmap(bh_result->b_page);
2316
2317        if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
2318                /* we've copied data from the page into the direct item, so the
2319                 * buffer in the page is now clean, mark it to reflect that.
2320                 */
2321                lock_buffer(bh_result);
2322                clear_buffer_dirty(bh_result);
2323                unlock_buffer(bh_result);
2324        }
2325        return retval;
2326}
2327
2328/*
2329 * mason@suse.com: updated in 2.5.54 to follow the same general io
2330 * start/recovery path as __block_write_full_page, along with special
2331 * code to handle reiserfs tails.
2332 */
2333static int reiserfs_write_full_page(struct page *page,
2334                                    struct writeback_control *wbc)
2335{
2336        struct inode *inode = page->mapping->host;
2337        unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
2338        int error = 0;
2339        unsigned long block;
2340        sector_t last_block;
2341        struct buffer_head *head, *bh;
2342        int partial = 0;
2343        int nr = 0;
2344        int checked = PageChecked(page);
2345        struct reiserfs_transaction_handle th;
2346        struct super_block *s = inode->i_sb;
2347        int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
2348        th.t_trans_id = 0;
2349
2350        /* no logging allowed when nonblocking or from PF_MEMALLOC */
2351        if (checked && (current->flags & PF_MEMALLOC)) {
2352                redirty_page_for_writepage(wbc, page);
2353                unlock_page(page);
2354                return 0;
2355        }
2356
2357        /* The page dirty bit is cleared before writepage is called, which
2358         * means we have to tell create_empty_buffers to make dirty buffers
2359         * The page really should be up to date at this point, so tossing
2360         * in the BH_Uptodate is just a sanity check.
2361         */
2362        if (!page_has_buffers(page)) {
2363                create_empty_buffers(page, s->s_blocksize,
2364                                     (1 << BH_Dirty) | (1 << BH_Uptodate));
2365        }
2366        head = page_buffers(page);
2367
2368        /* last page in the file, zero out any contents past the
2369         ** last byte in the file
2370         */
2371        if (page->index >= end_index) {
2372                unsigned last_offset;
2373
2374                last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2375                /* no file contents in this page */
2376                if (page->index >= end_index + 1 || !last_offset) {
2377                        unlock_page(page);
2378                        return 0;
2379                }
2380                zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
2381        }
2382        bh = head;
2383        block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
2384        last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
2385        /* first map all the buffers, logging any direct items we find */
2386        do {
2387                if (block > last_block) {
2388                        /*
2389                         * This can happen when the block size is less than
2390                         * the page size.  The corresponding bytes in the page
2391                         * were zero filled above
2392                         */
2393                        clear_buffer_dirty(bh);
2394                        set_buffer_uptodate(bh);
2395                } else if ((checked || buffer_dirty(bh)) &&
2396                           (!buffer_mapped(bh) || (buffer_mapped(bh)
2397                                                       && bh->b_blocknr ==
2398                                                       0))) {
2399                        /* not mapped yet, or it points to a direct item, search
2400                         * the btree for the mapping info, and log any direct
2401                         * items found
2402                         */
2403                        if ((error = map_block_for_writepage(inode, bh, block))) {
2404                                goto fail;
2405                        }
2406                }
2407                bh = bh->b_this_page;
2408                block++;
2409        } while (bh != head);
2410
2411        /*
2412         * we start the transaction after map_block_for_writepage,
2413         * because it can create holes in the file (an unbounded operation).
2414         * starting it here, we can make a reliable estimate for how many
2415         * blocks we're going to log
2416         */
2417        if (checked) {
2418                ClearPageChecked(page);
2419                reiserfs_write_lock(s);
2420                error = journal_begin(&th, s, bh_per_page + 1);
2421                if (error) {
2422                        reiserfs_write_unlock(s);
2423                        goto fail;
2424                }
2425                reiserfs_update_inode_transaction(inode);
2426        }
2427        /* now go through and lock any dirty buffers on the page */
2428        do {
2429                get_bh(bh);
2430                if (!buffer_mapped(bh))
2431                        continue;
2432                if (buffer_mapped(bh) && bh->b_blocknr == 0)
2433                        continue;
2434
2435                if (checked) {
2436                        reiserfs_prepare_for_journal(s, bh, 1);
2437                        journal_mark_dirty(&th, s, bh);
2438                        continue;
2439                }
2440                /* from this point on, we know the buffer is mapped to a
2441                 * real block and not a direct item
2442                 */
2443                if (wbc->sync_mode != WB_SYNC_NONE) {
2444                        lock_buffer(bh);
2445                } else {
2446                        if (!trylock_buffer(bh)) {
2447                                redirty_page_for_writepage(wbc, page);
2448                                continue;
2449                        }
2450                }
2451                if (test_clear_buffer_dirty(bh)) {
2452                        mark_buffer_async_write(bh);
2453                } else {
2454                        unlock_buffer(bh);
2455                }
2456        } while ((bh = bh->b_this_page) != head);
2457
2458        if (checked) {
2459                error = journal_end(&th, s, bh_per_page + 1);
2460                reiserfs_write_unlock(s);
2461                if (error)
2462                        goto fail;
2463        }
2464        BUG_ON(PageWriteback(page));
2465        set_page_writeback(page);
2466        unlock_page(page);
2467
2468        /*
2469         * since any buffer might be the only dirty buffer on the page,
2470         * the first submit_bh can bring the page out of writeback.
2471         * be careful with the buffers.
2472         */
2473        do {
2474                struct buffer_head *next = bh->b_this_page;
2475                if (buffer_async_write(bh)) {
2476                        submit_bh(WRITE, bh);
2477                        nr++;
2478                }
2479                put_bh(bh);
2480                bh = next;
2481        } while (bh != head);
2482
2483        error = 0;
2484      done:
2485        if (nr == 0) {
2486                /*
2487                 * if this page only had a direct item, it is very possible for
2488                 * no io to be required without there being an error.  Or,
2489                 * someone else could have locked them and sent them down the
2490                 * pipe without locking the page
2491                 */
2492                bh = head;
2493                do {
2494                        if (!buffer_uptodate(bh)) {
2495                                partial = 1;
2496                                break;
2497                        }
2498                        bh = bh->b_this_page;
2499                } while (bh != head);
2500                if (!partial)
2501                        SetPageUptodate(page);
2502                end_page_writeback(page);
2503        }
2504        return error;
2505
2506      fail:
2507        /* catches various errors, we need to make sure any valid dirty blocks
2508         * get to the media.  The page is currently locked and not marked for
2509         * writeback
2510         */
2511        ClearPageUptodate(page);
2512        bh = head;
2513        do {
2514                get_bh(bh);
2515                if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
2516                        lock_buffer(bh);
2517                        mark_buffer_async_write(bh);
2518                } else {
2519                        /*
2520                         * clear any dirty bits that might have come from getting
2521                         * attached to a dirty page
2522                         */
2523                        clear_buffer_dirty(bh);
2524                }
2525                bh = bh->b_this_page;
2526        } while (bh != head);
2527        SetPageError(page);
2528        BUG_ON(PageWriteback(page));
2529        set_page_writeback(page);
2530        unlock_page(page);
2531        do {
2532                struct buffer_head *next = bh->b_this_page;
2533                if (buffer_async_write(bh)) {
2534                        clear_buffer_dirty(bh);
2535                        submit_bh(WRITE, bh);
2536                        nr++;
2537                }
2538                put_bh(bh);
2539                bh = next;
2540        } while (bh != head);
2541        goto done;
2542}
2543
2544static int reiserfs_readpage(struct file *f, struct page *page)
2545{
2546        return block_read_full_page(page, reiserfs_get_block);
2547}
2548
2549static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
2550{
2551        struct inode *inode = page->mapping->host;
2552        reiserfs_wait_on_write_block(inode->i_sb);
2553        return reiserfs_write_full_page(page, wbc);
2554}
2555
2556static void reiserfs_truncate_failed_write(struct inode *inode)
2557{
2558        truncate_inode_pages(inode->i_mapping, inode->i_size);
2559        reiserfs_truncate_file(inode, 0);
2560}
2561
2562static int reiserfs_write_begin(struct file *file,
2563                                struct address_space *mapping,
2564                                loff_t pos, unsigned len, unsigned flags,
2565                                struct page **pagep, void **fsdata)
2566{
2567        struct inode *inode;
2568        struct page *page;
2569        pgoff_t index;
2570        int ret;
2571        int old_ref = 0;
2572
2573        inode = mapping->host;
2574        *fsdata = 0;
2575        if (flags & AOP_FLAG_CONT_EXPAND &&
2576            (pos & (inode->i_sb->s_blocksize - 1)) == 0) {
2577                pos ++;
2578                *fsdata = (void *)(unsigned long)flags;
2579        }
2580
2581        index = pos >> PAGE_CACHE_SHIFT;
2582        page = grab_cache_page_write_begin(mapping, index, flags);
2583        if (!page)
2584                return -ENOMEM;
2585        *pagep = page;
2586
2587        reiserfs_wait_on_write_block(inode->i_sb);
2588        fix_tail_page_for_writing(page);
2589        if (reiserfs_transaction_running(inode->i_sb)) {
2590                struct reiserfs_transaction_handle *th;
2591                th = (struct reiserfs_transaction_handle *)current->
2592                    journal_info;
2593                BUG_ON(!th->t_refcount);
2594                BUG_ON(!th->t_trans_id);
2595                old_ref = th->t_refcount;
2596                th->t_refcount++;
2597        }
2598        ret = __block_write_begin(page, pos, len, reiserfs_get_block);
2599        if (ret && reiserfs_transaction_running(inode->i_sb)) {
2600                struct reiserfs_transaction_handle *th = current->journal_info;
2601                /* this gets a little ugly.  If reiserfs_get_block returned an
2602                 * error and left a transacstion running, we've got to close it,
2603                 * and we've got to free handle if it was a persistent transaction.
2604                 *
2605                 * But, if we had nested into an existing transaction, we need
2606                 * to just drop the ref count on the handle.
2607                 *
2608                 * If old_ref == 0, the transaction is from reiserfs_get_block,
2609                 * and it was a persistent trans.  Otherwise, it was nested above.
2610                 */
2611                if (th->t_refcount > old_ref) {
2612                        if (old_ref)
2613                                th->t_refcount--;
2614                        else {
2615                                int err;
2616                                reiserfs_write_lock(inode->i_sb);
2617                                err = reiserfs_end_persistent_transaction(th);
2618                                reiserfs_write_unlock(inode->i_sb);
2619                                if (err)
2620                                        ret = err;
2621                        }
2622                }
2623        }
2624        if (ret) {
2625                unlock_page(page);
2626                page_cache_release(page);
2627                /* Truncate allocated blocks */
2628                reiserfs_truncate_failed_write(inode);
2629        }
2630        return ret;
2631}
2632
2633int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len)
2634{
2635        struct inode *inode = page->mapping->host;
2636        int ret;
2637        int old_ref = 0;
2638
2639        reiserfs_write_unlock(inode->i_sb);
2640        reiserfs_wait_on_write_block(inode->i_sb);
2641        reiserfs_write_lock(inode->i_sb);
2642
2643        fix_tail_page_for_writing(page);
2644        if (reiserfs_transaction_running(inode->i_sb)) {
2645                struct reiserfs_transaction_handle *th;
2646                th = (struct reiserfs_transaction_handle *)current->
2647                    journal_info;
2648                BUG_ON(!th->t_refcount);
2649                BUG_ON(!th->t_trans_id);
2650                old_ref = th->t_refcount;
2651                th->t_refcount++;
2652        }
2653
2654        ret = __block_write_begin(page, from, len, reiserfs_get_block);
2655        if (ret && reiserfs_transaction_running(inode->i_sb)) {
2656                struct reiserfs_transaction_handle *th = current->journal_info;
2657                /* this gets a little ugly.  If reiserfs_get_block returned an
2658                 * error and left a transacstion running, we've got to close it,
2659                 * and we've got to free handle if it was a persistent transaction.
2660                 *
2661                 * But, if we had nested into an existing transaction, we need
2662                 * to just drop the ref count on the handle.
2663                 *
2664                 * If old_ref == 0, the transaction is from reiserfs_get_block,
2665                 * and it was a persistent trans.  Otherwise, it was nested above.
2666                 */
2667                if (th->t_refcount > old_ref) {
2668                        if (old_ref)
2669                                th->t_refcount--;
2670                        else {
2671                                int err;
2672                                reiserfs_write_lock(inode->i_sb);
2673                                err = reiserfs_end_persistent_transaction(th);
2674                                reiserfs_write_unlock(inode->i_sb);
2675                                if (err)
2676                                        ret = err;
2677                        }
2678                }
2679        }
2680        return ret;
2681
2682}
2683
2684static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
2685{
2686        return generic_block_bmap(as, block, reiserfs_bmap);
2687}
2688
2689static int reiserfs_write_end(struct file *file, struct address_space *mapping,
2690                              loff_t pos, unsigned len, unsigned copied,
2691                              struct page *page, void *fsdata)
2692{
2693        struct inode *inode = page->mapping->host;
2694        int ret = 0;
2695        int update_sd = 0;
2696        struct reiserfs_transaction_handle *th;
2697        unsigned start;
2698        int lock_depth = 0;
2699        bool locked = false;
2700
2701        if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
2702                pos ++;
2703
2704        reiserfs_wait_on_write_block(inode->i_sb);
2705        if (reiserfs_transaction_running(inode->i_sb))
2706                th = current->journal_info;
2707        else
2708                th = NULL;
2709
2710        start = pos & (PAGE_CACHE_SIZE - 1);
2711        if (unlikely(copied < len)) {
2712                if (!PageUptodate(page))
2713                        copied = 0;
2714
2715                page_zero_new_buffers(page, start + copied, start + len);
2716        }
2717        flush_dcache_page(page);
2718
2719        reiserfs_commit_page(inode, page, start, start + copied);
2720
2721        /* generic_commit_write does this for us, but does not update the
2722         ** transaction tracking stuff when the size changes.  So, we have
2723         ** to do the i_size updates here.
2724         */
2725        if (pos + copied > inode->i_size) {
2726                struct reiserfs_transaction_handle myth;
2727                lock_depth = reiserfs_write_lock_once(inode->i_sb);
2728                locked = true;
2729                /* If the file have grown beyond the border where it
2730                   can have a tail, unmark it as needing a tail
2731                   packing */
2732                if ((have_large_tails(inode->i_sb)
2733                     && inode->i_size > i_block_size(inode) * 4)
2734                    || (have_small_tails(inode->i_sb)
2735                        && inode->i_size > i_block_size(inode)))
2736                        REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2737
2738                ret = journal_begin(&myth, inode->i_sb, 1);
2739                if (ret)
2740                        goto journal_error;
2741
2742                reiserfs_update_inode_transaction(inode);
2743                inode->i_size = pos + copied;
2744                /*
2745                 * this will just nest into our transaction.  It's important
2746                 * to use mark_inode_dirty so the inode gets pushed around on the
2747                 * dirty lists, and so that O_SYNC works as expected
2748                 */
2749                mark_inode_dirty(inode);
2750                reiserfs_update_sd(&myth, inode);
2751                update_sd = 1;
2752                ret = journal_end(&myth, inode->i_sb, 1);
2753                if (ret)
2754                        goto journal_error;
2755        }
2756        if (th) {
2757                if (!locked) {
2758                        lock_depth = reiserfs_write_lock_once(inode->i_sb);
2759                        locked = true;
2760                }
2761                if (!update_sd)
2762                        mark_inode_dirty(inode);
2763                ret = reiserfs_end_persistent_transaction(th);
2764                if (ret)
2765                        goto out;
2766        }
2767
2768      out:
2769        if (locked)
2770                reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2771        unlock_page(page);
2772        page_cache_release(page);
2773
2774        if (pos + len > inode->i_size)
2775                reiserfs_truncate_failed_write(inode);
2776
2777        return ret == 0 ? copied : ret;
2778
2779      journal_error:
2780        reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2781        locked = false;
2782        if (th) {
2783                if (!update_sd)
2784                        reiserfs_update_sd(th, inode);
2785                ret = reiserfs_end_persistent_transaction(th);
2786        }
2787        goto out;
2788}
2789
2790int reiserfs_commit_write(struct file *f, struct page *page,
2791                          unsigned from, unsigned to)
2792{
2793        struct inode *inode = page->mapping->host;
2794        loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
2795        int ret = 0;
2796        int update_sd = 0;
2797        struct reiserfs_transaction_handle *th = NULL;
2798
2799        reiserfs_write_unlock(inode->i_sb);
2800        reiserfs_wait_on_write_block(inode->i_sb);
2801        reiserfs_write_lock(inode->i_sb);
2802
2803        if (reiserfs_transaction_running(inode->i_sb)) {
2804                th = current->journal_info;
2805        }
2806        reiserfs_commit_page(inode, page, from, to);
2807
2808        /* generic_commit_write does this for us, but does not update the
2809         ** transaction tracking stuff when the size changes.  So, we have
2810         ** to do the i_size updates here.
2811         */
2812        if (pos > inode->i_size) {
2813                struct reiserfs_transaction_handle myth;
2814                /* If the file have grown beyond the border where it
2815                   can have a tail, unmark it as needing a tail
2816                   packing */
2817                if ((have_large_tails(inode->i_sb)
2818                     && inode->i_size > i_block_size(inode) * 4)
2819                    || (have_small_tails(inode->i_sb)
2820                        && inode->i_size > i_block_size(inode)))
2821                        REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2822
2823                ret = journal_begin(&myth, inode->i_sb, 1);
2824                if (ret)
2825                        goto journal_error;
2826
2827                reiserfs_update_inode_transaction(inode);
2828                inode->i_size = pos;
2829                /*
2830                 * this will just nest into our transaction.  It's important
2831                 * to use mark_inode_dirty so the inode gets pushed around on the
2832                 * dirty lists, and so that O_SYNC works as expected
2833                 */
2834                mark_inode_dirty(inode);
2835                reiserfs_update_sd(&myth, inode);
2836                update_sd = 1;
2837                ret = journal_end(&myth, inode->i_sb, 1);
2838                if (ret)
2839                        goto journal_error;
2840        }
2841        if (th) {
2842                if (!update_sd)
2843                        mark_inode_dirty(inode);
2844                ret = reiserfs_end_persistent_transaction(th);
2845                if (ret)
2846                        goto out;
2847        }
2848
2849      out:
2850        return ret;
2851
2852      journal_error:
2853        if (th) {
2854                if (!update_sd)
2855                        reiserfs_update_sd(th, inode);
2856                ret = reiserfs_end_persistent_transaction(th);
2857        }
2858
2859        return ret;
2860}
2861
2862void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
2863{
2864        if (reiserfs_attrs(inode->i_sb)) {
2865                if (sd_attrs & REISERFS_SYNC_FL)
2866                        inode->i_flags |= S_SYNC;
2867                else
2868                        inode->i_flags &= ~S_SYNC;
2869                if (sd_attrs & REISERFS_IMMUTABLE_FL)
2870                        inode->i_flags |= S_IMMUTABLE;
2871                else
2872                        inode->i_flags &= ~S_IMMUTABLE;
2873                if (sd_attrs & REISERFS_APPEND_FL)
2874                        inode->i_flags |= S_APPEND;
2875                else
2876                        inode->i_flags &= ~S_APPEND;
2877                if (sd_attrs & REISERFS_NOATIME_FL)
2878                        inode->i_flags |= S_NOATIME;
2879                else
2880                        inode->i_flags &= ~S_NOATIME;
2881                if (sd_attrs & REISERFS_NOTAIL_FL)
2882                        REISERFS_I(inode)->i_flags |= i_nopack_mask;
2883                else
2884                        REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
2885        }
2886}
2887
2888void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
2889{
2890        if (reiserfs_attrs(inode->i_sb)) {
2891                if (inode->i_flags & S_IMMUTABLE)
2892                        *sd_attrs |= REISERFS_IMMUTABLE_FL;
2893                else
2894                        *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
2895                if (inode->i_flags & S_SYNC)
2896                        *sd_attrs |= REISERFS_SYNC_FL;
2897                else
2898                        *sd_attrs &= ~REISERFS_SYNC_FL;
2899                if (inode->i_flags & S_NOATIME)
2900                        *sd_attrs |= REISERFS_NOATIME_FL;
2901                else
2902                        *sd_attrs &= ~REISERFS_NOATIME_FL;
2903                if (REISERFS_I(inode)->i_flags & i_nopack_mask)
2904                        *sd_attrs |= REISERFS_NOTAIL_FL;
2905                else
2906                        *sd_attrs &= ~REISERFS_NOTAIL_FL;
2907        }
2908}
2909
2910/* decide if this buffer needs to stay around for data logging or ordered
2911** write purposes
2912*/
2913static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
2914{
2915        int ret = 1;
2916        struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
2917
2918        lock_buffer(bh);
2919        spin_lock(&j->j_dirty_buffers_lock);
2920        if (!buffer_mapped(bh)) {
2921                goto free_jh;
2922        }
2923        /* the page is locked, and the only places that log a data buffer
2924         * also lock the page.
2925         */
2926        if (reiserfs_file_data_log(inode)) {
2927                /*
2928                 * very conservative, leave the buffer pinned if
2929                 * anyone might need it.
2930                 */
2931                if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
2932                        ret = 0;
2933                }
2934        } else  if (buffer_dirty(bh)) {
2935                struct reiserfs_journal_list *jl;
2936                struct reiserfs_jh *jh = bh->b_private;
2937
2938                /* why is this safe?
2939                 * reiserfs_setattr updates i_size in the on disk
2940                 * stat data before allowing vmtruncate to be called.
2941                 *
2942                 * If buffer was put onto the ordered list for this
2943                 * transaction, we know for sure either this transaction
2944                 * or an older one already has updated i_size on disk,
2945                 * and this ordered data won't be referenced in the file
2946                 * if we crash.
2947                 *
2948                 * if the buffer was put onto the ordered list for an older
2949                 * transaction, we need to leave it around
2950                 */
2951                if (jh && (jl = jh->jl)
2952                    && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
2953                        ret = 0;
2954        }
2955      free_jh:
2956        if (ret && bh->b_private) {
2957                reiserfs_free_jh(bh);
2958        }
2959        spin_unlock(&j->j_dirty_buffers_lock);
2960        unlock_buffer(bh);
2961        return ret;
2962}
2963
2964/* clm -- taken from fs/buffer.c:block_invalidate_page */
2965static void reiserfs_invalidatepage(struct page *page, unsigned long offset)
2966{
2967        struct buffer_head *head, *bh, *next;
2968        struct inode *inode = page->mapping->host;
2969        unsigned int curr_off = 0;
2970        int ret = 1;
2971
2972        BUG_ON(!PageLocked(page));
2973
2974        if (offset == 0)
2975                ClearPageChecked(page);
2976
2977        if (!page_has_buffers(page))
2978                goto out;
2979
2980        head = page_buffers(page);
2981        bh = head;
2982        do {
2983                unsigned int next_off = curr_off + bh->b_size;
2984                next = bh->b_this_page;
2985
2986                /*
2987                 * is this block fully invalidated?
2988                 */
2989                if (offset <= curr_off) {
2990                        if (invalidatepage_can_drop(inode, bh))
2991                                reiserfs_unmap_buffer(bh);
2992                        else
2993                                ret = 0;
2994                }
2995                curr_off = next_off;
2996                bh = next;
2997        } while (bh != head);
2998
2999        /*
3000         * We release buffers only if the entire page is being invalidated.
3001         * The get_block cached value has been unconditionally invalidated,
3002         * so real IO is not possible anymore.
3003         */
3004        if (!offset && ret) {
3005                ret = try_to_release_page(page, 0);
3006                /* maybe should BUG_ON(!ret); - neilb */
3007        }
3008      out:
3009        return;
3010}
3011
3012static int reiserfs_set_page_dirty(struct page *page)
3013{
3014        struct inode *inode = page->mapping->host;
3015        if (reiserfs_file_data_log(inode)) {
3016                SetPageChecked(page);
3017                return __set_page_dirty_nobuffers(page);
3018        }
3019        return __set_page_dirty_buffers(page);
3020}
3021
3022/*
3023 * Returns 1 if the page's buffers were dropped.  The page is locked.
3024 *
3025 * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
3026 * in the buffers at page_buffers(page).
3027 *
3028 * even in -o notail mode, we can't be sure an old mount without -o notail
3029 * didn't create files with tails.
3030 */
3031static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
3032{
3033        struct inode *inode = page->mapping->host;
3034        struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3035        struct buffer_head *head;
3036        struct buffer_head *bh;
3037        int ret = 1;
3038
3039        WARN_ON(PageChecked(page));
3040        spin_lock(&j->j_dirty_buffers_lock);
3041        head = page_buffers(page);
3042        bh = head;
3043        do {
3044                if (bh->b_private) {
3045                        if (!buffer_dirty(bh) && !buffer_locked(bh)) {
3046                                reiserfs_free_jh(bh);
3047                        } else {
3048                                ret = 0;
3049                                break;
3050                        }
3051                }
3052                bh = bh->b_this_page;
3053        } while (bh != head);
3054        if (ret)
3055                ret = try_to_free_buffers(page);
3056        spin_unlock(&j->j_dirty_buffers_lock);
3057        return ret;
3058}
3059
3060/* We thank Mingming Cao for helping us understand in great detail what
3061   to do in this section of the code. */
3062static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
3063                                  const struct iovec *iov, loff_t offset,
3064                                  unsigned long nr_segs)
3065{
3066        struct file *file = iocb->ki_filp;
3067        struct inode *inode = file->f_mapping->host;
3068        ssize_t ret;
3069
3070        ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
3071                                  reiserfs_get_blocks_direct_io);
3072
3073        /*
3074         * In case of error extending write may have instantiated a few
3075         * blocks outside i_size. Trim these off again.
3076         */
3077        if (unlikely((rw & WRITE) && ret < 0)) {
3078                loff_t isize = i_size_read(inode);
3079                loff_t end = offset + iov_length(iov, nr_segs);
3080
3081                if (end > isize)
3082                        vmtruncate(inode, isize);
3083        }
3084
3085        return ret;
3086}
3087
3088int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
3089{
3090        struct inode *inode = dentry->d_inode;
3091        unsigned int ia_valid;
3092        int depth;
3093        int error;
3094
3095        error = inode_change_ok(inode, attr);
3096        if (error)
3097                return error;
3098
3099        /* must be turned off for recursive notify_change calls */
3100        ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
3101
3102        depth = reiserfs_write_lock_once(inode->i_sb);
3103        if (is_quota_modification(inode, attr))
3104                dquot_initialize(inode);
3105
3106        if (attr->ia_valid & ATTR_SIZE) {
3107                /* version 2 items will be caught by the s_maxbytes check
3108                 ** done for us in vmtruncate
3109                 */
3110                if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
3111                    attr->ia_size > MAX_NON_LFS) {
3112                        error = -EFBIG;
3113                        goto out;
3114                }
3115
3116                inode_dio_wait(inode);
3117
3118                /* fill in hole pointers in the expanding truncate case. */
3119                if (attr->ia_size > inode->i_size) {
3120                        error = generic_cont_expand_simple(inode, attr->ia_size);
3121                        if (REISERFS_I(inode)->i_prealloc_count > 0) {
3122                                int err;
3123                                struct reiserfs_transaction_handle th;
3124                                /* we're changing at most 2 bitmaps, inode + super */
3125                                err = journal_begin(&th, inode->i_sb, 4);
3126                                if (!err) {
3127                                        reiserfs_discard_prealloc(&th, inode);
3128                                        err = journal_end(&th, inode->i_sb, 4);
3129                                }
3130                                if (err)
3131                                        error = err;
3132                        }
3133                        if (error)
3134                                goto out;
3135                        /*
3136                         * file size is changed, ctime and mtime are
3137                         * to be updated
3138                         */
3139                        attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
3140                }
3141        }
3142
3143        if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
3144             ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
3145            (get_inode_sd_version(inode) == STAT_DATA_V1)) {
3146                /* stat data of format v3.5 has 16 bit uid and gid */
3147                error = -EINVAL;
3148                goto out;
3149        }
3150
3151        if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
3152            (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
3153                struct reiserfs_transaction_handle th;
3154                int jbegin_count =
3155                    2 *
3156                    (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
3157                     REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
3158                    2;
3159
3160                error = reiserfs_chown_xattrs(inode, attr);
3161
3162                if (error)
3163                        return error;
3164
3165                /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
3166                error = journal_begin(&th, inode->i_sb, jbegin_count);
3167                if (error)
3168                        goto out;
3169                error = dquot_transfer(inode, attr);
3170                if (error) {
3171                        journal_end(&th, inode->i_sb, jbegin_count);
3172                        goto out;
3173                }
3174
3175                /* Update corresponding info in inode so that everything is in
3176                 * one transaction */
3177                if (attr->ia_valid & ATTR_UID)
3178                        inode->i_uid = attr->ia_uid;
3179                if (attr->ia_valid & ATTR_GID)
3180                        inode->i_gid = attr->ia_gid;
3181                mark_inode_dirty(inode);
3182                error = journal_end(&th, inode->i_sb, jbegin_count);
3183                if (error)
3184                        goto out;
3185        }
3186
3187        /*
3188         * Relax the lock here, as it might truncate the
3189         * inode pages and wait for inode pages locks.
3190         * To release such page lock, the owner needs the
3191         * reiserfs lock
3192         */
3193        reiserfs_write_unlock_once(inode->i_sb, depth);
3194        if ((attr->ia_valid & ATTR_SIZE) &&
3195            attr->ia_size != i_size_read(inode))
3196                error = vmtruncate(inode, attr->ia_size);
3197
3198        if (!error) {
3199                setattr_copy(inode, attr);
3200                mark_inode_dirty(inode);
3201        }
3202        depth = reiserfs_write_lock_once(inode->i_sb);
3203
3204        if (!error && reiserfs_posixacl(inode->i_sb)) {
3205                if (attr->ia_valid & ATTR_MODE)
3206                        error = reiserfs_acl_chmod(inode);
3207        }
3208
3209      out:
3210        reiserfs_write_unlock_once(inode->i_sb, depth);
3211
3212        return error;
3213}
3214
3215const struct address_space_operations reiserfs_address_space_operations = {
3216        .writepage = reiserfs_writepage,
3217        .readpage = reiserfs_readpage,
3218        .readpages = reiserfs_readpages,
3219        .releasepage = reiserfs_releasepage,
3220        .invalidatepage = reiserfs_invalidatepage,
3221        .write_begin = reiserfs_write_begin,
3222        .write_end = reiserfs_write_end,
3223        .bmap = reiserfs_aop_bmap,
3224        .direct_IO = reiserfs_direct_IO,
3225        .set_page_dirty = reiserfs_set_page_dirty,
3226};
3227
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