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 = fh_len;
1577        }
1578        if (fh_len < 2)
1579                return NULL;
1580
1581        return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
1582                (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
1583}
1584
1585struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1586                int fh_len, int fh_type)
1587{
1588        if (fh_type > fh_len)
1589                fh_type = fh_len;
1590        if (fh_type < 4)
1591                return NULL;
1592
1593        return reiserfs_get_dentry(sb,
1594                (fh_type >= 5) ? fid->raw[3] : fid->raw[2],
1595                (fh_type >= 5) ? fid->raw[4] : fid->raw[3],
1596                (fh_type == 6) ? fid->raw[5] : 0);
1597}
1598
1599int reiserfs_encode_fh(struct inode *inode, __u32 * data, int *lenp,
1600                       struct inode *parent)
1601{
1602        int maxlen = *lenp;
1603
1604        if (parent && (maxlen < 5)) {
1605                *lenp = 5;
1606                return 255;
1607        } else if (maxlen < 3) {
1608                *lenp = 3;
1609                return 255;
1610        }
1611
1612        data[0] = inode->i_ino;
1613        data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1614        data[2] = inode->i_generation;
1615        *lenp = 3;
1616        if (parent) {
1617                data[3] = parent->i_ino;
1618                data[4] = le32_to_cpu(INODE_PKEY(parent)->k_dir_id);
1619                *lenp = 5;
1620                if (maxlen >= 6) {
1621                        data[5] = parent->i_generation;
1622                        *lenp = 6;
1623                }
1624        }
1625        return *lenp;
1626}
1627
1628/* looks for stat data, then copies fields to it, marks the buffer
1629   containing stat data as dirty */
1630/* reiserfs inodes are never really dirty, since the dirty inode call
1631** always logs them.  This call allows the VFS inode marking routines
1632** to properly mark inodes for datasync and such, but only actually
1633** does something when called for a synchronous update.
1634*/
1635int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1636{
1637        struct reiserfs_transaction_handle th;
1638        int jbegin_count = 1;
1639
1640        if (inode->i_sb->s_flags & MS_RDONLY)
1641                return -EROFS;
1642        /* memory pressure can sometimes initiate write_inode calls with sync == 1,
1643         ** these cases are just when the system needs ram, not when the
1644         ** inode needs to reach disk for safety, and they can safely be
1645         ** ignored because the altered inode has already been logged.
1646         */
1647        if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) {
1648                reiserfs_write_lock(inode->i_sb);
1649                if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
1650                        reiserfs_update_sd(&th, inode);
1651                        journal_end_sync(&th, inode->i_sb, jbegin_count);
1652                }
1653                reiserfs_write_unlock(inode->i_sb);
1654        }
1655        return 0;
1656}
1657
1658/* stat data of new object is inserted already, this inserts the item
1659   containing "." and ".." entries */
1660static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
1661                                  struct inode *inode,
1662                                  struct item_head *ih, struct treepath *path,
1663                                  struct inode *dir)
1664{
1665        struct super_block *sb = th->t_super;
1666        char empty_dir[EMPTY_DIR_SIZE];
1667        char *body = empty_dir;
1668        struct cpu_key key;
1669        int retval;
1670
1671        BUG_ON(!th->t_trans_id);
1672
1673        _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
1674                      le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
1675                      TYPE_DIRENTRY, 3 /*key length */ );
1676
1677        /* compose item head for new item. Directories consist of items of
1678           old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
1679           is done by reiserfs_new_inode */
1680        if (old_format_only(sb)) {
1681                make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1682                                  TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
1683
1684                make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
1685                                       ih->ih_key.k_objectid,
1686                                       INODE_PKEY(dir)->k_dir_id,
1687                                       INODE_PKEY(dir)->k_objectid);
1688        } else {
1689                make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1690                                  TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
1691
1692                make_empty_dir_item(body, ih->ih_key.k_dir_id,
1693                                    ih->ih_key.k_objectid,
1694                                    INODE_PKEY(dir)->k_dir_id,
1695                                    INODE_PKEY(dir)->k_objectid);
1696        }
1697
1698        /* look for place in the tree for new item */
1699        retval = search_item(sb, &key, path);
1700        if (retval == IO_ERROR) {
1701                reiserfs_error(sb, "vs-13080",
1702                               "i/o failure occurred creating new directory");
1703                return -EIO;
1704        }
1705        if (retval == ITEM_FOUND) {
1706                pathrelse(path);
1707                reiserfs_warning(sb, "vs-13070",
1708                                 "object with this key exists (%k)",
1709                                 &(ih->ih_key));
1710                return -EEXIST;
1711        }
1712
1713        /* insert item, that is empty directory item */
1714        return reiserfs_insert_item(th, path, &key, ih, inode, body);
1715}
1716
1717/* stat data of object has been inserted, this inserts the item
1718   containing the body of symlink */
1719static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode,    /* Inode of symlink */
1720                                struct item_head *ih,
1721                                struct treepath *path, const char *symname,
1722                                int item_len)
1723{
1724        struct super_block *sb = th->t_super;
1725        struct cpu_key key;
1726        int retval;
1727
1728        BUG_ON(!th->t_trans_id);
1729
1730        _make_cpu_key(&key, KEY_FORMAT_3_5,
1731                      le32_to_cpu(ih->ih_key.k_dir_id),
1732                      le32_to_cpu(ih->ih_key.k_objectid),
1733                      1, TYPE_DIRECT, 3 /*key length */ );
1734
1735        make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
1736                          0 /*free_space */ );
1737
1738        /* look for place in the tree for new item */
1739        retval = search_item(sb, &key, path);
1740        if (retval == IO_ERROR) {
1741                reiserfs_error(sb, "vs-13080",
1742                               "i/o failure occurred creating new symlink");
1743                return -EIO;
1744        }
1745        if (retval == ITEM_FOUND) {
1746                pathrelse(path);
1747                reiserfs_warning(sb, "vs-13080",
1748                                 "object with this key exists (%k)",
1749                                 &(ih->ih_key));
1750                return -EEXIST;
1751        }
1752
1753        /* insert item, that is body of symlink */
1754        return reiserfs_insert_item(th, path, &key, ih, inode, symname);
1755}
1756
1757/* inserts the stat data into the tree, and then calls
1758   reiserfs_new_directory (to insert ".", ".." item if new object is
1759   directory) or reiserfs_new_symlink (to insert symlink body if new
1760   object is symlink) or nothing (if new object is regular file)
1761
1762   NOTE! uid and gid must already be set in the inode.  If we return
1763   non-zero due to an error, we have to drop the quota previously allocated
1764   for the fresh inode.  This can only be done outside a transaction, so
1765   if we return non-zero, we also end the transaction.  */
1766int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1767                       struct inode *dir, umode_t mode, const char *symname,
1768                       /* 0 for regular, EMTRY_DIR_SIZE for dirs,
1769                          strlen (symname) for symlinks) */
1770                       loff_t i_size, struct dentry *dentry,
1771                       struct inode *inode,
1772                       struct reiserfs_security_handle *security)
1773{
1774        struct super_block *sb;
1775        struct reiserfs_iget_args args;
1776        INITIALIZE_PATH(path_to_key);
1777        struct cpu_key key;
1778        struct item_head ih;
1779        struct stat_data sd;
1780        int retval;
1781        int err;
1782
1783        BUG_ON(!th->t_trans_id);
1784
1785        reiserfs_write_unlock(inode->i_sb);
1786        err = dquot_alloc_inode(inode);
1787        reiserfs_write_lock(inode->i_sb);
1788        if (err)
1789                goto out_end_trans;
1790        if (!dir->i_nlink) {
1791                err = -EPERM;
1792                goto out_bad_inode;
1793        }
1794
1795        sb = dir->i_sb;
1796
1797        /* item head of new item */
1798        ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
1799        ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
1800        if (!ih.ih_key.k_objectid) {
1801                err = -ENOMEM;
1802                goto out_bad_inode;
1803        }
1804        args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
1805        if (old_format_only(sb))
1806                make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
1807                                  TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
1808        else
1809                make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
1810                                  TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
1811        memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
1812        args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
1813        if (insert_inode_locked4(inode, args.objectid,
1814                             reiserfs_find_actor, &args) < 0) {
1815                err = -EINVAL;
1816                goto out_bad_inode;
1817        }
1818        if (old_format_only(sb))
1819                /* not a perfect generation count, as object ids can be reused, but
1820                 ** this is as good as reiserfs can do right now.
1821                 ** note that the private part of inode isn't filled in yet, we have
1822                 ** to use the directory.
1823                 */
1824                inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
1825        else
1826#if defined( USE_INODE_GENERATION_COUNTER )
1827                inode->i_generation =
1828                    le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
1829#else
1830                inode->i_generation = ++event;
1831#endif
1832
1833        /* fill stat data */
1834        set_nlink(inode, (S_ISDIR(mode) ? 2 : 1));
1835
1836        /* uid and gid must already be set by the caller for quota init */
1837
1838        /* symlink cannot be immutable or append only, right? */
1839        if (S_ISLNK(inode->i_mode))
1840                inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
1841
1842        inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1843        inode->i_size = i_size;
1844        inode->i_blocks = 0;
1845        inode->i_bytes = 0;
1846        REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
1847            U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
1848
1849        INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1850        REISERFS_I(inode)->i_flags = 0;
1851        REISERFS_I(inode)->i_prealloc_block = 0;
1852        REISERFS_I(inode)->i_prealloc_count = 0;
1853        REISERFS_I(inode)->i_trans_id = 0;
1854        REISERFS_I(inode)->i_jl = NULL;
1855        REISERFS_I(inode)->i_attrs =
1856            REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
1857        sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
1858        reiserfs_init_xattr_rwsem(inode);
1859
1860        /* key to search for correct place for new stat data */
1861        _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
1862                      le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
1863                      TYPE_STAT_DATA, 3 /*key length */ );
1864
1865        /* find proper place for inserting of stat data */
1866        retval = search_item(sb, &key, &path_to_key);
1867        if (retval == IO_ERROR) {
1868                err = -EIO;
1869                goto out_bad_inode;
1870        }
1871        if (retval == ITEM_FOUND) {
1872                pathrelse(&path_to_key);
1873                err = -EEXIST;
1874                goto out_bad_inode;
1875        }
1876        if (old_format_only(sb)) {
1877                if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
1878                        pathrelse(&path_to_key);
1879                        /* i_uid or i_gid is too big to be stored in stat data v3.5 */
1880                        err = -EINVAL;
1881                        goto out_bad_inode;
1882                }
1883                inode2sd_v1(&sd, inode, inode->i_size);
1884        } else {
1885                inode2sd(&sd, inode, inode->i_size);
1886        }
1887        // store in in-core inode the key of stat data and version all
1888        // object items will have (directory items will have old offset
1889        // format, other new objects will consist of new items)
1890        if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
1891                set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1892        else
1893                set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1894        if (old_format_only(sb))
1895                set_inode_sd_version(inode, STAT_DATA_V1);
1896        else
1897                set_inode_sd_version(inode, STAT_DATA_V2);
1898
1899        /* insert the stat data into the tree */
1900#ifdef DISPLACE_NEW_PACKING_LOCALITIES
1901        if (REISERFS_I(dir)->new_packing_locality)
1902                th->displace_new_blocks = 1;
1903#endif
1904        retval =
1905            reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
1906                                 (char *)(&sd));
1907        if (retval) {
1908                err = retval;
1909                reiserfs_check_path(&path_to_key);
1910                goto out_bad_inode;
1911        }
1912#ifdef DISPLACE_NEW_PACKING_LOCALITIES
1913        if (!th->displace_new_blocks)
1914                REISERFS_I(dir)->new_packing_locality = 0;
1915#endif
1916        if (S_ISDIR(mode)) {
1917                /* insert item with "." and ".." */
1918                retval =
1919                    reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
1920        }
1921
1922        if (S_ISLNK(mode)) {
1923                /* insert body of symlink */
1924                if (!old_format_only(sb))
1925                        i_size = ROUND_UP(i_size);
1926                retval =
1927                    reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
1928                                         i_size);
1929        }
1930        if (retval) {
1931                err = retval;
1932                reiserfs_check_path(&path_to_key);
1933                journal_end(th, th->t_super, th->t_blocks_allocated);
1934                goto out_inserted_sd;
1935        }
1936
1937        if (reiserfs_posixacl(inode->i_sb)) {
1938                retval = reiserfs_inherit_default_acl(th, dir, dentry, inode);
1939                if (retval) {
1940                        err = retval;
1941                        reiserfs_check_path(&path_to_key);
1942                        journal_end(th, th->t_super, th->t_blocks_allocated);
1943                        goto out_inserted_sd;
1944                }
1945        } else if (inode->i_sb->s_flags & MS_POSIXACL) {
1946                reiserfs_warning(inode->i_sb, "jdm-13090",
1947                                 "ACLs aren't enabled in the fs, "
1948                                 "but vfs thinks they are!");
1949        } else if (IS_PRIVATE(dir))
1950                inode->i_flags |= S_PRIVATE;
1951
1952        if (security->name) {
1953                retval = reiserfs_security_write(th, inode, security);
1954                if (retval) {
1955                        err = retval;
1956                        reiserfs_check_path(&path_to_key);
1957                        retval = journal_end(th, th->t_super,
1958                                             th->t_blocks_allocated);
1959                        if (retval)
1960                                err = retval;
1961                        goto out_inserted_sd;
1962                }
1963        }
1964
1965        reiserfs_update_sd(th, inode);
1966        reiserfs_check_path(&path_to_key);
1967
1968        return 0;
1969
1970/* it looks like you can easily compress these two goto targets into
1971 * one.  Keeping it like this doesn't actually hurt anything, and they
1972 * are place holders for what the quota code actually needs.
1973 */
1974      out_bad_inode:
1975        /* Invalidate the object, nothing was inserted yet */
1976        INODE_PKEY(inode)->k_objectid = 0;
1977
1978        /* Quota change must be inside a transaction for journaling */
1979        dquot_free_inode(inode);
1980
1981      out_end_trans:
1982        journal_end(th, th->t_super, th->t_blocks_allocated);
1983        reiserfs_write_unlock(inode->i_sb);
1984        /* Drop can be outside and it needs more credits so it's better to have it outside */
1985        dquot_drop(inode);
1986        reiserfs_write_lock(inode->i_sb);
1987        inode->i_flags |= S_NOQUOTA;
1988        make_bad_inode(inode);
1989
1990      out_inserted_sd:
1991        clear_nlink(inode);
1992        th->t_trans_id = 0;     /* so the caller can't use this handle later */
1993        unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
1994        iput(inode);
1995        return err;
1996}
1997
1998/*
1999** finds the tail page in the page cache,
2000** reads the last block in.
2001**
2002** On success, page_result is set to a locked, pinned page, and bh_result
2003** is set to an up to date buffer for the last block in the file.  returns 0.
2004**
2005** tail conversion is not done, so bh_result might not be valid for writing
2006** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
2007** trying to write the block.
2008**
2009** on failure, nonzero is returned, page_result and bh_result are untouched.
2010*/
2011static int grab_tail_page(struct inode *inode,
2012                          struct page **page_result,
2013                          struct buffer_head **bh_result)
2014{
2015
2016        /* we want the page with the last byte in the file,
2017         ** not the page that will hold the next byte for appending
2018         */
2019        unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
2020        unsigned long pos = 0;
2021        unsigned long start = 0;
2022        unsigned long blocksize = inode->i_sb->s_blocksize;
2023        unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1);
2024        struct buffer_head *bh;
2025        struct buffer_head *head;
2026        struct page *page;
2027        int error;
2028
2029        /* we know that we are only called with inode->i_size > 0.
2030         ** we also know that a file tail can never be as big as a block
2031         ** If i_size % blocksize == 0, our file is currently block aligned
2032         ** and it won't need converting or zeroing after a truncate.
2033         */
2034        if ((offset & (blocksize - 1)) == 0) {
2035                return -ENOENT;
2036        }
2037        page = grab_cache_page(inode->i_mapping, index);
2038        error = -ENOMEM;
2039        if (!page) {
2040                goto out;
2041        }
2042        /* start within the page of the last block in the file */
2043        start = (offset / blocksize) * blocksize;
2044
2045        error = __block_write_begin(page, start, offset - start,
2046                                    reiserfs_get_block_create_0);
2047        if (error)
2048                goto unlock;
2049
2050        head = page_buffers(page);
2051        bh = head;
2052        do {
2053                if (pos >= start) {
2054                        break;
2055                }
2056                bh = bh->b_this_page;
2057                pos += blocksize;
2058        } while (bh != head);
2059
2060        if (!buffer_uptodate(bh)) {
2061                /* note, this should never happen, prepare_write should
2062                 ** be taking care of this for us.  If the buffer isn't up to date,
2063                 ** I've screwed up the code to find the buffer, or the code to
2064                 ** call prepare_write
2065                 */
2066                reiserfs_error(inode->i_sb, "clm-6000",
2067                               "error reading block %lu", bh->b_blocknr);
2068                error = -EIO;
2069                goto unlock;
2070        }
2071        *bh_result = bh;
2072        *page_result = page;
2073
2074      out:
2075        return error;
2076
2077      unlock:
2078        unlock_page(page);
2079        page_cache_release(page);
2080        return error;
2081}
2082
2083/*
2084** vfs version of truncate file.  Must NOT be called with
2085** a transaction already started.
2086**
2087** some code taken from block_truncate_page
2088*/
2089int reiserfs_truncate_file(struct inode *inode, int update_timestamps)
2090{
2091        struct reiserfs_transaction_handle th;
2092        /* we want the offset for the first byte after the end of the file */
2093        unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2094        unsigned blocksize = inode->i_sb->s_blocksize;
2095        unsigned length;
2096        struct page *page = NULL;
2097        int error;
2098        struct buffer_head *bh = NULL;
2099        int err2;
2100        int lock_depth;
2101
2102        lock_depth = reiserfs_write_lock_once(inode->i_sb);
2103
2104        if (inode->i_size > 0) {
2105                error = grab_tail_page(inode, &page, &bh);
2106                if (error) {
2107                        // -ENOENT means we truncated past the end of the file,
2108                        // and get_block_create_0 could not find a block to read in,
2109                        // which is ok.
2110                        if (error != -ENOENT)
2111                                reiserfs_error(inode->i_sb, "clm-6001",
2112                                               "grab_tail_page failed %d",
2113                                               error);
2114                        page = NULL;
2115                        bh = NULL;
2116                }
2117        }
2118
2119        /* so, if page != NULL, we have a buffer head for the offset at
2120         ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
2121         ** then we have an unformatted node.  Otherwise, we have a direct item,
2122         ** and no zeroing is required on disk.  We zero after the truncate,
2123         ** because the truncate might pack the item anyway
2124         ** (it will unmap bh if it packs).
2125         */
2126        /* it is enough to reserve space in transaction for 2 balancings:
2127           one for "save" link adding and another for the first
2128           cut_from_item. 1 is for update_sd */
2129        error = journal_begin(&th, inode->i_sb,
2130                              JOURNAL_PER_BALANCE_CNT * 2 + 1);
2131        if (error)
2132                goto out;
2133        reiserfs_update_inode_transaction(inode);
2134        if (update_timestamps)
2135                /* we are doing real truncate: if the system crashes before the last
2136                   transaction of truncating gets committed - on reboot the file
2137                   either appears truncated properly or not truncated at all */
2138                add_save_link(&th, inode, 1);
2139        err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps);
2140        error =
2141            journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
2142        if (error)
2143                goto out;
2144
2145        /* check reiserfs_do_truncate after ending the transaction */
2146        if (err2) {
2147                error = err2;
2148                goto out;
2149        }
2150        
2151        if (update_timestamps) {
2152                error = remove_save_link(inode, 1 /* truncate */);
2153                if (error)
2154                        goto out;
2155        }
2156
2157        if (page) {
2158                length = offset & (blocksize - 1);
2159                /* if we are not on a block boundary */
2160                if (length) {
2161                        length = blocksize - length;
2162                        zero_user(page, offset, length);
2163                        if (buffer_mapped(bh) && bh->b_blocknr != 0) {
2164                                mark_buffer_dirty(bh);
2165                        }
2166                }
2167                unlock_page(page);
2168                page_cache_release(page);
2169        }
2170
2171        reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2172
2173        return 0;
2174      out:
2175        if (page) {
2176                unlock_page(page);
2177                page_cache_release(page);
2178        }
2179
2180        reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2181
2182        return error;
2183}
2184
2185static int map_block_for_writepage(struct inode *inode,
2186                                   struct buffer_head *bh_result,
2187                                   unsigned long block)
2188{
2189        struct reiserfs_transaction_handle th;
2190        int fs_gen;
2191        struct item_head tmp_ih;
2192        struct item_head *ih;
2193        struct buffer_head *bh;
2194        __le32 *item;
2195        struct cpu_key key;
2196        INITIALIZE_PATH(path);
2197        int pos_in_item;
2198        int jbegin_count = JOURNAL_PER_BALANCE_CNT;
2199        loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
2200        int retval;
2201        int use_get_block = 0;
2202        int bytes_copied = 0;
2203        int copy_size;
2204        int trans_running = 0;
2205
2206        /* catch places below that try to log something without starting a trans */
2207        th.t_trans_id = 0;
2208
2209        if (!buffer_uptodate(bh_result)) {
2210                return -EIO;
2211        }
2212
2213        kmap(bh_result->b_page);
2214      start_over:
2215        reiserfs_write_lock(inode->i_sb);
2216        make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
2217
2218      research:
2219        retval = search_for_position_by_key(inode->i_sb, &key, &path);
2220        if (retval != POSITION_FOUND) {
2221                use_get_block = 1;
2222                goto out;
2223        }
2224
2225        bh = get_last_bh(&path);
2226        ih = get_ih(&path);
2227        item = get_item(&path);
2228        pos_in_item = path.pos_in_item;
2229
2230        /* we've found an unformatted node */
2231        if (indirect_item_found(retval, ih)) {
2232                if (bytes_copied > 0) {
2233                        reiserfs_warning(inode->i_sb, "clm-6002",
2234                                         "bytes_copied %d", bytes_copied);
2235                }
2236                if (!get_block_num(item, pos_in_item)) {
2237                        /* crap, we are writing to a hole */
2238                        use_get_block = 1;
2239                        goto out;
2240                }
2241                set_block_dev_mapped(bh_result,
2242                                     get_block_num(item, pos_in_item), inode);
2243        } else if (is_direct_le_ih(ih)) {
2244                char *p;
2245                p = page_address(bh_result->b_page);
2246                p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
2247                copy_size = ih_item_len(ih) - pos_in_item;
2248
2249                fs_gen = get_generation(inode->i_sb);
2250                copy_item_head(&tmp_ih, ih);
2251
2252                if (!trans_running) {
2253                        /* vs-3050 is gone, no need to drop the path */
2254                        retval = journal_begin(&th, inode->i_sb, jbegin_count);
2255                        if (retval)
2256                                goto out;
2257                        reiserfs_update_inode_transaction(inode);
2258                        trans_running = 1;
2259                        if (fs_changed(fs_gen, inode->i_sb)
2260                            && item_moved(&tmp_ih, &path)) {
2261                                reiserfs_restore_prepared_buffer(inode->i_sb,
2262                                                                 bh);
2263                                goto research;
2264                        }
2265                }
2266
2267                reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
2268
2269                if (fs_changed(fs_gen, inode->i_sb)
2270                    && item_moved(&tmp_ih, &path)) {
2271                        reiserfs_restore_prepared_buffer(inode->i_sb, bh);
2272                        goto research;
2273                }
2274
2275                memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied,
2276                       copy_size);
2277
2278                journal_mark_dirty(&th, inode->i_sb, bh);
2279                bytes_copied += copy_size;
2280                set_block_dev_mapped(bh_result, 0, inode);
2281
2282                /* are there still bytes left? */
2283                if (bytes_copied < bh_result->b_size &&
2284                    (byte_offset + bytes_copied) < inode->i_size) {
2285                        set_cpu_key_k_offset(&key,
2286                                             cpu_key_k_offset(&key) +
2287                                             copy_size);
2288                        goto research;
2289                }
2290        } else {
2291                reiserfs_warning(inode->i_sb, "clm-6003",
2292                                 "bad item inode %lu", inode->i_ino);
2293                retval = -EIO;
2294                goto out;
2295        }
2296        retval = 0;
2297
2298      out:
2299        pathrelse(&path);
2300        if (trans_running) {
2301                int err = journal_end(&th, inode->i_sb, jbegin_count);
2302                if (err)
2303                        retval = err;
2304                trans_running = 0;
2305        }
2306        reiserfs_write_unlock(inode->i_sb);
2307
2308        /* this is where we fill in holes in the file. */
2309        if (use_get_block) {
2310                retval = reiserfs_get_block(inode, block, bh_result,
2311                                            GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
2312                                            | GET_BLOCK_NO_DANGLE);
2313                if (!retval) {
2314                        if (!buffer_mapped(bh_result)
2315                            || bh_result->b_blocknr == 0) {
2316                                /* get_block failed to find a mapped unformatted node. */
2317                                use_get_block = 0;
2318                                goto start_over;
2319                        }
2320                }
2321        }
2322        kunmap(bh_result->b_page);
2323
2324        if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
2325                /* we've copied data from the page into the direct item, so the
2326                 * buffer in the page is now clean, mark it to reflect that.
2327                 */
2328                lock_buffer(bh_result);
2329                clear_buffer_dirty(bh_result);
2330                unlock_buffer(bh_result);
2331        }
2332        return retval;
2333}
2334
2335/*
2336 * mason@suse.com: updated in 2.5.54 to follow the same general io
2337 * start/recovery path as __block_write_full_page, along with special
2338 * code to handle reiserfs tails.
2339 */
2340static int reiserfs_write_full_page(struct page *page,
2341                                    struct writeback_control *wbc)
2342{
2343        struct inode *inode = page->mapping->host;
2344        unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
2345        int error = 0;
2346        unsigned long block;
2347        sector_t last_block;
2348        struct buffer_head *head, *bh;
2349        int partial = 0;
2350        int nr = 0;
2351        int checked = PageChecked(page);
2352        struct reiserfs_transaction_handle th;
2353        struct super_block *s = inode->i_sb;
2354        int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
2355        th.t_trans_id = 0;
2356
2357        /* no logging allowed when nonblocking or from PF_MEMALLOC */
2358        if (checked && (current->flags & PF_MEMALLOC)) {
2359                redirty_page_for_writepage(wbc, page);
2360                unlock_page(page);
2361                return 0;
2362        }
2363
2364        /* The page dirty bit is cleared before writepage is called, which
2365         * means we have to tell create_empty_buffers to make dirty buffers
2366         * The page really should be up to date at this point, so tossing
2367         * in the BH_Uptodate is just a sanity check.
2368         */
2369        if (!page_has_buffers(page)) {
2370                create_empty_buffers(page, s->s_blocksize,
2371                                     (1 << BH_Dirty) | (1 << BH_Uptodate));
2372        }
2373        head = page_buffers(page);
2374
2375        /* last page in the file, zero out any contents past the
2376         ** last byte in the file
2377         */
2378        if (page->index >= end_index) {
2379                unsigned last_offset;
2380
2381                last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2382                /* no file contents in this page */
2383                if (page->index >= end_index + 1 || !last_offset) {
2384                        unlock_page(page);
2385                        return 0;
2386                }
2387                zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
2388        }
2389        bh = head;
2390        block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
2391        last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
2392        /* first map all the buffers, logging any direct items we find */
2393        do {
2394                if (block > last_block) {
2395                        /*
2396                         * This can happen when the block size is less than
2397                         * the page size.  The corresponding bytes in the page
2398                         * were zero filled above
2399                         */
2400                        clear_buffer_dirty(bh);
2401                        set_buffer_uptodate(bh);
2402                } else if ((checked || buffer_dirty(bh)) &&
2403                           (!buffer_mapped(bh) || (buffer_mapped(bh)
2404                                                       && bh->b_blocknr ==
2405                                                       0))) {
2406                        /* not mapped yet, or it points to a direct item, search
2407                         * the btree for the mapping info, and log any direct
2408                         * items found
2409                         */
2410                        if ((error = map_block_for_writepage(inode, bh, block))) {
2411                                goto fail;
2412                        }
2413                }
2414                bh = bh->b_this_page;
2415                block++;
2416        } while (bh != head);
2417
2418        /*
2419         * we start the transaction after map_block_for_writepage,
2420         * because it can create holes in the file (an unbounded operation).
2421         * starting it here, we can make a reliable estimate for how many
2422         * blocks we're going to log
2423         */
2424        if (checked) {
2425                ClearPageChecked(page);
2426                reiserfs_write_lock(s);
2427                error = journal_begin(&th, s, bh_per_page + 1);
2428                if (error) {
2429                        reiserfs_write_unlock(s);
2430                        goto fail;
2431                }
2432                reiserfs_update_inode_transaction(inode);
2433        }
2434        /* now go through and lock any dirty buffers on the page */
2435        do {
2436                get_bh(bh);
2437                if (!buffer_mapped(bh))
2438                        continue;
2439                if (buffer_mapped(bh) && bh->b_blocknr == 0)
2440                        continue;
2441
2442                if (checked) {
2443                        reiserfs_prepare_for_journal(s, bh, 1);
2444                        journal_mark_dirty(&th, s, bh);
2445                        continue;
2446                }
2447                /* from this point on, we know the buffer is mapped to a
2448                 * real block and not a direct item
2449                 */
2450                if (wbc->sync_mode != WB_SYNC_NONE) {
2451                        lock_buffer(bh);
2452                } else {
2453                        if (!trylock_buffer(bh)) {
2454                                redirty_page_for_writepage(wbc, page);
2455                                continue;
2456                        }
2457                }
2458                if (test_clear_buffer_dirty(bh)) {
2459                        mark_buffer_async_write(bh);
2460                } else {
2461                        unlock_buffer(bh);
2462                }
2463        } while ((bh = bh->b_this_page) != head);
2464
2465        if (checked) {
2466                error = journal_end(&th, s, bh_per_page + 1);
2467                reiserfs_write_unlock(s);
2468                if (error)
2469                        goto fail;
2470        }
2471        BUG_ON(PageWriteback(page));
2472        set_page_writeback(page);
2473        unlock_page(page);
2474
2475        /*
2476         * since any buffer might be the only dirty buffer on the page,
2477         * the first submit_bh can bring the page out of writeback.
2478         * be careful with the buffers.
2479         */
2480        do {
2481                struct buffer_head *next = bh->b_this_page;
2482                if (buffer_async_write(bh)) {
2483                        submit_bh(WRITE, bh);
2484                        nr++;
2485                }
2486                put_bh(bh);
2487                bh = next;
2488        } while (bh != head);
2489
2490        error = 0;
2491      done:
2492        if (nr == 0) {
2493                /*
2494                 * if this page only had a direct item, it is very possible for
2495                 * no io to be required without there being an error.  Or,
2496                 * someone else could have locked them and sent them down the
2497                 * pipe without locking the page
2498                 */
2499                bh = head;
2500                do {
2501                        if (!buffer_uptodate(bh)) {
2502                                partial = 1;
2503                                break;
2504                        }
2505                        bh = bh->b_this_page;
2506                } while (bh != head);
2507                if (!partial)
2508                        SetPageUptodate(page);
2509                end_page_writeback(page);
2510        }
2511        return error;
2512
2513      fail:
2514        /* catches various errors, we need to make sure any valid dirty blocks
2515         * get to the media.  The page is currently locked and not marked for
2516         * writeback
2517         */
2518        ClearPageUptodate(page);
2519        bh = head;
2520        do {
2521                get_bh(bh);
2522                if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
2523                        lock_buffer(bh);
2524                        mark_buffer_async_write(bh);
2525                } else {
2526                        /*
2527                         * clear any dirty bits that might have come from getting
2528                         * attached to a dirty page
2529                         */
2530                        clear_buffer_dirty(bh);
2531                }
2532                bh = bh->b_this_page;
2533        } while (bh != head);
2534        SetPageError(page);
2535        BUG_ON(PageWriteback(page));
2536        set_page_writeback(page);
2537        unlock_page(page);
2538        do {
2539                struct buffer_head *next = bh->b_this_page;
2540                if (buffer_async_write(bh)) {
2541                        clear_buffer_dirty(bh);
2542                        submit_bh(WRITE, bh);
2543                        nr++;
2544                }
2545                put_bh(bh);
2546                bh = next;
2547        } while (bh != head);
2548        goto done;
2549}
2550
2551static int reiserfs_readpage(struct file *f, struct page *page)
2552{
2553        return block_read_full_page(page, reiserfs_get_block);
2554}
2555
2556static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
2557{
2558        struct inode *inode = page->mapping->host;
2559        reiserfs_wait_on_write_block(inode->i_sb);
2560        return reiserfs_write_full_page(page, wbc);
2561}
2562
2563static void reiserfs_truncate_failed_write(struct inode *inode)
2564{
2565        truncate_inode_pages(inode->i_mapping, inode->i_size);
2566        reiserfs_truncate_file(inode, 0);
2567}
2568
2569static int reiserfs_write_begin(struct file *file,
2570                                struct address_space *mapping,
2571                                loff_t pos, unsigned len, unsigned flags,
2572                                struct page **pagep, void **fsdata)
2573{
2574        struct inode *inode;
2575        struct page *page;
2576        pgoff_t index;
2577        int ret;
2578        int old_ref = 0;
2579
2580        inode = mapping->host;
2581        *fsdata = 0;
2582        if (flags & AOP_FLAG_CONT_EXPAND &&
2583            (pos & (inode->i_sb->s_blocksize - 1)) == 0) {
2584                pos ++;
2585                *fsdata = (void *)(unsigned long)flags;
2586        }
2587
2588        index = pos >> PAGE_CACHE_SHIFT;
2589        page = grab_cache_page_write_begin(mapping, index, flags);
2590        if (!page)
2591                return -ENOMEM;
2592        *pagep = page;
2593
2594        reiserfs_wait_on_write_block(inode->i_sb);
2595        fix_tail_page_for_writing(page);
2596        if (reiserfs_transaction_running(inode->i_sb)) {
2597                struct reiserfs_transaction_handle *th;
2598                th = (struct reiserfs_transaction_handle *)current->
2599                    journal_info;
2600                BUG_ON(!th->t_refcount);
2601                BUG_ON(!th->t_trans_id);
2602                old_ref = th->t_refcount;
2603                th->t_refcount++;
2604        }
2605        ret = __block_write_begin(page, pos, len, reiserfs_get_block);
2606        if (ret && reiserfs_transaction_running(inode->i_sb)) {
2607                struct reiserfs_transaction_handle *th = current->journal_info;
2608                /* this gets a little ugly.  If reiserfs_get_block returned an
2609                 * error and left a transacstion running, we've got to close it,
2610                 * and we've got to free handle if it was a persistent transaction.
2611                 *
2612                 * But, if we had nested into an existing transaction, we need
2613                 * to just drop the ref count on the handle.
2614                 *
2615                 * If old_ref == 0, the transaction is from reiserfs_get_block,
2616                 * and it was a persistent trans.  Otherwise, it was nested above.
2617                 */
2618                if (th->t_refcount > old_ref) {
2619                        if (old_ref)
2620                                th->t_refcount--;
2621                        else {
2622                                int err;
2623                                reiserfs_write_lock(inode->i_sb);
2624                                err = reiserfs_end_persistent_transaction(th);
2625                                reiserfs_write_unlock(inode->i_sb);
2626                                if (err)
2627                                        ret = err;
2628                        }
2629                }
2630        }
2631        if (ret) {
2632                unlock_page(page);
2633                page_cache_release(page);
2634                /* Truncate allocated blocks */
2635                reiserfs_truncate_failed_write(inode);
2636        }
2637        return ret;
2638}
2639
2640int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len)
2641{
2642        struct inode *inode = page->mapping->host;
2643        int ret;
2644        int old_ref = 0;
2645
2646        reiserfs_write_unlock(inode->i_sb);
2647        reiserfs_wait_on_write_block(inode->i_sb);
2648        reiserfs_write_lock(inode->i_sb);
2649
2650        fix_tail_page_for_writing(page);
2651        if (reiserfs_transaction_running(inode->i_sb)) {
2652                struct reiserfs_transaction_handle *th;
2653                th = (struct reiserfs_transaction_handle *)current->
2654                    journal_info;
2655                BUG_ON(!th->t_refcount);
2656                BUG_ON(!th->t_trans_id);
2657                old_ref = th->t_refcount;
2658                th->t_refcount++;
2659        }
2660
2661        ret = __block_write_begin(page, from, len, reiserfs_get_block);
2662        if (ret && reiserfs_transaction_running(inode->i_sb)) {
2663                struct reiserfs_transaction_handle *th = current->journal_info;
2664                /* this gets a little ugly.  If reiserfs_get_block returned an
2665                 * error and left a transacstion running, we've got to close it,
2666                 * and we've got to free handle if it was a persistent transaction.
2667                 *
2668                 * But, if we had nested into an existing transaction, we need
2669                 * to just drop the ref count on the handle.
2670                 *
2671                 * If old_ref == 0, the transaction is from reiserfs_get_block,
2672                 * and it was a persistent trans.  Otherwise, it was nested above.
2673                 */
2674                if (th->t_refcount > old_ref) {
2675                        if (old_ref)
2676                                th->t_refcount--;
2677                        else {
2678                                int err;
2679                                reiserfs_write_lock(inode->i_sb);
2680                                err = reiserfs_end_persistent_transaction(th);
2681                                reiserfs_write_unlock(inode->i_sb);
2682                                if (err)
2683                                        ret = err;
2684                        }
2685                }
2686        }
2687        return ret;
2688
2689}
2690
2691static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
2692{
2693        return generic_block_bmap(as, block, reiserfs_bmap);
2694}
2695
2696static int reiserfs_write_end(struct file *file, struct address_space *mapping,
2697                              loff_t pos, unsigned len, unsigned copied,
2698                              struct page *page, void *fsdata)
2699{
2700        struct inode *inode = page->mapping->host;
2701        int ret = 0;
2702        int update_sd = 0;
2703        struct reiserfs_transaction_handle *th;
2704        unsigned start;
2705        int lock_depth = 0;
2706        bool locked = false;
2707
2708        if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
2709                pos ++;
2710
2711        reiserfs_wait_on_write_block(inode->i_sb);
2712        if (reiserfs_transaction_running(inode->i_sb))
2713                th = current->journal_info;
2714        else
2715                th = NULL;
2716
2717        start = pos & (PAGE_CACHE_SIZE - 1);
2718        if (unlikely(copied < len)) {
2719                if (!PageUptodate(page))
2720                        copied = 0;
2721
2722                page_zero_new_buffers(page, start + copied, start + len);
2723        }
2724        flush_dcache_page(page);
2725
2726        reiserfs_commit_page(inode, page, start, start + copied);
2727
2728        /* generic_commit_write does this for us, but does not update the
2729         ** transaction tracking stuff when the size changes.  So, we have
2730         ** to do the i_size updates here.
2731         */
2732        if (pos + copied > inode->i_size) {
2733                struct reiserfs_transaction_handle myth;
2734                lock_depth = reiserfs_write_lock_once(inode->i_sb);
2735                locked = true;
2736                /* If the file have grown beyond the border where it
2737                   can have a tail, unmark it as needing a tail
2738                   packing */
2739                if ((have_large_tails(inode->i_sb)
2740                     && inode->i_size > i_block_size(inode) * 4)
2741                    || (have_small_tails(inode->i_sb)
2742                        && inode->i_size > i_block_size(inode)))
2743                        REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2744
2745                ret = journal_begin(&myth, inode->i_sb, 1);
2746                if (ret)
2747                        goto journal_error;
2748
2749                reiserfs_update_inode_transaction(inode);
2750                inode->i_size = pos + copied;
2751                /*
2752                 * this will just nest into our transaction.  It's important
2753                 * to use mark_inode_dirty so the inode gets pushed around on the
2754                 * dirty lists, and so that O_SYNC works as expected
2755                 */
2756                mark_inode_dirty(inode);
2757                reiserfs_update_sd(&myth, inode);
2758                update_sd = 1;
2759                ret = journal_end(&myth, inode->i_sb, 1);
2760                if (ret)
2761                        goto journal_error;
2762        }
2763        if (th) {
2764                if (!locked) {
2765                        lock_depth = reiserfs_write_lock_once(inode->i_sb);
2766                        locked = true;
2767                }
2768                if (!update_sd)
2769                        mark_inode_dirty(inode);
2770                ret = reiserfs_end_persistent_transaction(th);
2771                if (ret)
2772                        goto out;
2773        }
2774
2775      out:
2776        if (locked)
2777                reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2778        unlock_page(page);
2779        page_cache_release(page);
2780
2781        if (pos + len > inode->i_size)
2782                reiserfs_truncate_failed_write(inode);
2783
2784        return ret == 0 ? copied : ret;
2785
2786      journal_error:
2787        reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2788        locked = false;
2789        if (th) {
2790                if (!update_sd)
2791                        reiserfs_update_sd(th, inode);
2792                ret = reiserfs_end_persistent_transaction(th);
2793        }
2794        goto out;
2795}
2796
2797int reiserfs_commit_write(struct file *f, struct page *page,
2798                          unsigned from, unsigned to)
2799{
2800        struct inode *inode = page->mapping->host;
2801        loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
2802        int ret = 0;
2803        int update_sd = 0;
2804        struct reiserfs_transaction_handle *th = NULL;
2805
2806        reiserfs_write_unlock(inode->i_sb);
2807        reiserfs_wait_on_write_block(inode->i_sb);
2808        reiserfs_write_lock(inode->i_sb);
2809
2810        if (reiserfs_transaction_running(inode->i_sb)) {
2811                th = current->journal_info;
2812        }
2813        reiserfs_commit_page(inode, page, from, to);
2814
2815        /* generic_commit_write does this for us, but does not update the
2816         ** transaction tracking stuff when the size changes.  So, we have
2817         ** to do the i_size updates here.
2818         */
2819        if (pos > inode->i_size) {
2820                struct reiserfs_transaction_handle myth;
2821                /* If the file have grown beyond the border where it
2822                   can have a tail, unmark it as needing a tail
2823                   packing */
2824                if ((have_large_tails(inode->i_sb)
2825                     && inode->i_size > i_block_size(inode) * 4)
2826                    || (have_small_tails(inode->i_sb)
2827                        && inode->i_size > i_block_size(inode)))
2828                        REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2829
2830                ret = journal_begin(&myth, inode->i_sb, 1);
2831                if (ret)
2832                        goto journal_error;
2833
2834                reiserfs_update_inode_transaction(inode);
2835                inode->i_size = pos;
2836                /*
2837                 * this will just nest into our transaction.  It's important
2838                 * to use mark_inode_dirty so the inode gets pushed around on the
2839                 * dirty lists, and so that O_SYNC works as expected
2840                 */
2841                mark_inode_dirty(inode);
2842                reiserfs_update_sd(&myth, inode);
2843                update_sd = 1;
2844                ret = journal_end(&myth, inode->i_sb, 1);
2845                if (ret)
2846                        goto journal_error;
2847        }
2848        if (th) {
2849                if (!update_sd)
2850                        mark_inode_dirty(inode);
2851                ret = reiserfs_end_persistent_transaction(th);
2852                if (ret)
2853                        goto out;
2854        }
2855
2856      out:
2857        return ret;
2858
2859      journal_error:
2860        if (th) {
2861                if (!update_sd)
2862                        reiserfs_update_sd(th, inode);
2863                ret = reiserfs_end_persistent_transaction(th);
2864        }
2865
2866        return ret;
2867}
2868
2869void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
2870{
2871        if (reiserfs_attrs(inode->i_sb)) {
2872                if (sd_attrs & REISERFS_SYNC_FL)
2873                        inode->i_flags |= S_SYNC;
2874                else
2875                        inode->i_flags &= ~S_SYNC;
2876                if (sd_attrs & REISERFS_IMMUTABLE_FL)
2877                        inode->i_flags |= S_IMMUTABLE;
2878                else
2879                        inode->i_flags &= ~S_IMMUTABLE;
2880                if (sd_attrs & REISERFS_APPEND_FL)
2881                        inode->i_flags |= S_APPEND;
2882                else
2883                        inode->i_flags &= ~S_APPEND;
2884                if (sd_attrs & REISERFS_NOATIME_FL)
2885                        inode->i_flags |= S_NOATIME;
2886                else
2887                        inode->i_flags &= ~S_NOATIME;
2888                if (sd_attrs & REISERFS_NOTAIL_FL)
2889                        REISERFS_I(inode)->i_flags |= i_nopack_mask;
2890                else
2891                        REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
2892        }
2893}
2894
2895void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
2896{
2897        if (reiserfs_attrs(inode->i_sb)) {
2898                if (inode->i_flags & S_IMMUTABLE)
2899                        *sd_attrs |= REISERFS_IMMUTABLE_FL;
2900                else
2901                        *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
2902                if (inode->i_flags & S_SYNC)
2903                        *sd_attrs |= REISERFS_SYNC_FL;
2904                else
2905                        *sd_attrs &= ~REISERFS_SYNC_FL;
2906                if (inode->i_flags & S_NOATIME)
2907                        *sd_attrs |= REISERFS_NOATIME_FL;
2908                else
2909                        *sd_attrs &= ~REISERFS_NOATIME_FL;
2910                if (REISERFS_I(inode)->i_flags & i_nopack_mask)
2911                        *sd_attrs |= REISERFS_NOTAIL_FL;
2912                else
2913                        *sd_attrs &= ~REISERFS_NOTAIL_FL;
2914        }
2915}
2916
2917/* decide if this buffer needs to stay around for data logging or ordered
2918** write purposes
2919*/
2920static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
2921{
2922        int ret = 1;
2923        struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
2924
2925        lock_buffer(bh);
2926        spin_lock(&j->j_dirty_buffers_lock);
2927        if (!buffer_mapped(bh)) {
2928                goto free_jh;
2929        }
2930        /* the page is locked, and the only places that log a data buffer
2931         * also lock the page.
2932         */
2933        if (reiserfs_file_data_log(inode)) {
2934                /*
2935                 * very conservative, leave the buffer pinned if
2936                 * anyone might need it.
2937                 */
2938                if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
2939                        ret = 0;
2940                }
2941        } else  if (buffer_dirty(bh)) {
2942                struct reiserfs_journal_list *jl;
2943                struct reiserfs_jh *jh = bh->b_private;
2944
2945                /* why is this safe?
2946                 * reiserfs_setattr updates i_size in the on disk
2947                 * stat data before allowing vmtruncate to be called.
2948                 *
2949                 * If buffer was put onto the ordered list for this
2950                 * transaction, we know for sure either this transaction
2951                 * or an older one already has updated i_size on disk,
2952                 * and this ordered data won't be referenced in the file
2953                 * if we crash.
2954                 *
2955                 * if the buffer was put onto the ordered list for an older
2956                 * transaction, we need to leave it around
2957                 */
2958                if (jh && (jl = jh->jl)
2959                    && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
2960                        ret = 0;
2961        }
2962      free_jh:
2963        if (ret && bh->b_private) {
2964                reiserfs_free_jh(bh);
2965        }
2966        spin_unlock(&j->j_dirty_buffers_lock);
2967        unlock_buffer(bh);
2968        return ret;
2969}
2970
2971/* clm -- taken from fs/buffer.c:block_invalidate_page */
2972static void reiserfs_invalidatepage(struct page *page, unsigned long offset)
2973{
2974        struct buffer_head *head, *bh, *next;
2975        struct inode *inode = page->mapping->host;
2976        unsigned int curr_off = 0;
2977        int ret = 1;
2978
2979        BUG_ON(!PageLocked(page));
2980
2981        if (offset == 0)
2982                ClearPageChecked(page);
2983
2984        if (!page_has_buffers(page))
2985                goto out;
2986
2987        head = page_buffers(page);
2988        bh = head;
2989        do {
2990                unsigned int next_off = curr_off + bh->b_size;
2991                next = bh->b_this_page;
2992
2993                /*
2994                 * is this block fully invalidated?
2995                 */
2996                if (offset <= curr_off) {
2997                        if (invalidatepage_can_drop(inode, bh))
2998                                reiserfs_unmap_buffer(bh);
2999                        else
3000                                ret = 0;
3001                }
3002                curr_off = next_off;
3003                bh = next;
3004        } while (bh != head);
3005
3006        /*
3007         * We release buffers only if the entire page is being invalidated.
3008         * The get_block cached value has been unconditionally invalidated,
3009         * so real IO is not possible anymore.
3010         */
3011        if (!offset && ret) {
3012                ret = try_to_release_page(page, 0);
3013                /* maybe should BUG_ON(!ret); - neilb */
3014        }
3015      out:
3016        return;
3017}
3018
3019static int reiserfs_set_page_dirty(struct page *page)
3020{
3021        struct inode *inode = page->mapping->host;
3022        if (reiserfs_file_data_log(inode)) {
3023                SetPageChecked(page);
3024                return __set_page_dirty_nobuffers(page);
3025        }
3026        return __set_page_dirty_buffers(page);
3027}
3028
3029/*
3030 * Returns 1 if the page's buffers were dropped.  The page is locked.
3031 *
3032 * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
3033 * in the buffers at page_buffers(page).
3034 *
3035 * even in -o notail mode, we can't be sure an old mount without -o notail
3036 * didn't create files with tails.
3037 */
3038static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
3039{
3040        struct inode *inode = page->mapping->host;
3041        struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3042        struct buffer_head *head;
3043        struct buffer_head *bh;
3044        int ret = 1;
3045
3046        WARN_ON(PageChecked(page));
3047        spin_lock(&j->j_dirty_buffers_lock);
3048        head = page_buffers(page);
3049        bh = head;
3050        do {
3051                if (bh->b_private) {
3052                        if (!buffer_dirty(bh) && !buffer_locked(bh)) {
3053                                reiserfs_free_jh(bh);
3054                        } else {
3055                                ret = 0;
3056                                break;
3057                        }
3058                }
3059                bh = bh->b_this_page;
3060        } while (bh != head);
3061        if (ret)
3062                ret = try_to_free_buffers(page);
3063        spin_unlock(&j->j_dirty_buffers_lock);
3064        return ret;
3065}
3066
3067/* We thank Mingming Cao for helping us understand in great detail what
3068   to do in this section of the code. */
3069static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
3070                                  const struct iovec *iov, loff_t offset,
3071                                  unsigned long nr_segs)
3072{
3073        struct file *file = iocb->ki_filp;
3074        struct inode *inode = file->f_mapping->host;
3075        ssize_t ret;
3076
3077        ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
3078                                  reiserfs_get_blocks_direct_io);
3079
3080        /*
3081         * In case of error extending write may have instantiated a few
3082         * blocks outside i_size. Trim these off again.
3083         */
3084        if (unlikely((rw & WRITE) && ret < 0)) {
3085                loff_t isize = i_size_read(inode);
3086                loff_t end = offset + iov_length(iov, nr_segs);
3087
3088                if (end > isize)
3089                        vmtruncate(inode, isize);
3090        }
3091
3092        return ret;
3093}
3094
3095int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
3096{
3097        struct inode *inode = dentry->d_inode;
3098        unsigned int ia_valid;
3099        int depth;
3100        int error;
3101
3102        error = inode_change_ok(inode, attr);
3103        if (error)
3104                return error;
3105
3106        /* must be turned off for recursive notify_change calls */
3107        ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
3108
3109        if (is_quota_modification(inode, attr))
3110                dquot_initialize(inode);
3111        depth = reiserfs_write_lock_once(inode->i_sb);
3112        if (attr->ia_valid & ATTR_SIZE) {
3113                /* version 2 items will be caught by the s_maxbytes check
3114                 ** done for us in vmtruncate
3115                 */
3116                if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
3117                    attr->ia_size > MAX_NON_LFS) {
3118                        error = -EFBIG;
3119                        goto out;
3120                }
3121
3122                inode_dio_wait(inode);
3123
3124                /* fill in hole pointers in the expanding truncate case. */
3125                if (attr->ia_size > inode->i_size) {
3126                        error = generic_cont_expand_simple(inode, attr->ia_size);
3127                        if (REISERFS_I(inode)->i_prealloc_count > 0) {
3128                                int err;
3129                                struct reiserfs_transaction_handle th;
3130                                /* we're changing at most 2 bitmaps, inode + super */
3131                                err = journal_begin(&th, inode->i_sb, 4);
3132                                if (!err) {
3133                                        reiserfs_discard_prealloc(&th, inode);
3134                                        err = journal_end(&th, inode->i_sb, 4);
3135                                }
3136                                if (err)
3137                                        error = err;
3138                        }
3139                        if (error)
3140                                goto out;
3141                        /*
3142                         * file size is changed, ctime and mtime are
3143                         * to be updated
3144                         */
3145                        attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
3146                }
3147        }
3148
3149        if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
3150             ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
3151            (get_inode_sd_version(inode) == STAT_DATA_V1)) {
3152                /* stat data of format v3.5 has 16 bit uid and gid */
3153                error = -EINVAL;
3154                goto out;
3155        }
3156
3157        if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
3158            (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
3159                struct reiserfs_transaction_handle th;
3160                int jbegin_count =
3161                    2 *
3162                    (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
3163                     REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
3164                    2;
3165
3166                error = reiserfs_chown_xattrs(inode, attr);
3167
3168                if (error)
3169                        return error;
3170
3171                /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
3172                error = journal_begin(&th, inode->i_sb, jbegin_count);
3173                if (error)
3174                        goto out;
3175                reiserfs_write_unlock_once(inode->i_sb, depth);
3176                error = dquot_transfer(inode, attr);
3177                depth = reiserfs_write_lock_once(inode->i_sb);
3178                if (error) {
3179                        journal_end(&th, inode->i_sb, jbegin_count);
3180                        goto out;
3181                }
3182
3183                /* Update corresponding info in inode so that everything is in
3184                 * one transaction */
3185                if (attr->ia_valid & ATTR_UID)
3186                        inode->i_uid = attr->ia_uid;
3187                if (attr->ia_valid & ATTR_GID)
3188                        inode->i_gid = attr->ia_gid;
3189                mark_inode_dirty(inode);
3190                error = journal_end(&th, inode->i_sb, jbegin_count);
3191                if (error)
3192                        goto out;
3193        }
3194
3195        /*
3196         * Relax the lock here, as it might truncate the
3197         * inode pages and wait for inode pages locks.
3198         * To release such page lock, the owner needs the
3199         * reiserfs lock
3200         */
3201        reiserfs_write_unlock_once(inode->i_sb, depth);
3202        if ((attr->ia_valid & ATTR_SIZE) &&
3203            attr->ia_size != i_size_read(inode))
3204                error = vmtruncate(inode, attr->ia_size);
3205
3206        if (!error) {
3207                setattr_copy(inode, attr);
3208                mark_inode_dirty(inode);
3209        }
3210        depth = reiserfs_write_lock_once(inode->i_sb);
3211
3212        if (!error && reiserfs_posixacl(inode->i_sb)) {
3213                if (attr->ia_valid & ATTR_MODE)
3214                        error = reiserfs_acl_chmod(inode);
3215        }
3216
3217      out:
3218        reiserfs_write_unlock_once(inode->i_sb, depth);
3219
3220        return error;
3221}
3222
3223const struct address_space_operations reiserfs_address_space_operations = {
3224        .writepage = reiserfs_writepage,
3225        .readpage = reiserfs_readpage,
3226        .readpages = reiserfs_readpages,
3227        .releasepage = reiserfs_releasepage,
3228        .invalidatepage = reiserfs_invalidatepage,
3229        .write_begin = reiserfs_write_begin,
3230        .write_end = reiserfs_write_end,
3231        .bmap = reiserfs_aop_bmap,
3232        .direct_IO = reiserfs_direct_IO,
3233        .set_page_dirty = reiserfs_set_page_dirty,
3234};
3235
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