fs/reiserfs/inode.c

   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 <linux/reiserfs_fs.h>
   8 #include <linux/reiserfs_acl.h>
   9 #include <linux/reiserfs_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
  22 int reiserfs_commit_write(struct file *f, struct page *page,
  23                           unsigned from, unsigned to);
  24
  25 void 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         end_writeback(inode);   /* note this must go after the journal_end to prevent deadlock */
  80         dquot_drop(inode);
  81         inode->i_blocks = 0;
  82         reiserfs_write_unlock_once(inode->i_sb, depth);
  83         return;
  84
  85 no_delete:
  86         end_writeback(inode);
  87         dquot_drop(inode);
  88 }
  89
  90 static 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 */
 104 void 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 //
 116 inline 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 */
 168 static 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 */
 187 static 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
 199 static inline int indirect_item_found(int retval, struct item_head *ih)
 200 {
 201         return (retval == POSITION_FOUND) && is_indirect_le_ih(ih);
 202 }
 203
 204 static 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 //
 214 static 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
 223 static 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
 257 static 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
 425 static 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 */
 455 static 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. */
 464 static 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 */
 520 static 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
 581 static 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
 599 int 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
1057 static int
1058 reiserfs_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  */
1067 static 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
1090 static 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 */
1102 static 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
1129 static 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                 inode->i_nlink = 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                 inode->i_nlink = 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
1254 static 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
1278 static 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 */
1304 static 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
1327 void 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 */
1395 static 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
1406 int 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 */
1416 void 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                 inode->i_nlink = 0;
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
1480 /**
1481  * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
1482  *
1483  * @inode:    inode from hash table to check
1484  * @opaque:   "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
1485  *
1486  * This function is called by iget5_locked() to distinguish reiserfs inodes
1487  * having the same inode numbers. Such inodes can only exist due to some
1488  * error condition. One of them should be bad. Inodes with identical
1489  * inode numbers (objectids) are distinguished by parent directory ids.
1490  *
1491  */
1492 int reiserfs_find_actor(struct inode *inode, void *opaque)
1493 {
1494         struct reiserfs_iget_args *args;
1495
1496         args = opaque;
1497         /* args is already in CPU order */
1498         return (inode->i_ino == args->objectid) &&
1499             (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
1500 }
1501
1502 struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
1503 {
1504         struct inode *inode;
1505         struct reiserfs_iget_args args;
1506
1507         args.objectid = key->on_disk_key.k_objectid;
1508         args.dirid = key->on_disk_key.k_dir_id;
1509         reiserfs_write_unlock(s);
1510         inode = iget5_locked(s, key->on_disk_key.k_objectid,
1511                              reiserfs_find_actor, reiserfs_init_locked_inode,
1512                              (void *)(&args));
1513         reiserfs_write_lock(s);
1514         if (!inode)
1515                 return ERR_PTR(-ENOMEM);
1516
1517         if (inode->i_state & I_NEW) {
1518                 reiserfs_read_locked_inode(inode, &args);
1519                 unlock_new_inode(inode);
1520         }
1521
1522         if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
1523                 /* either due to i/o error or a stale NFS handle */
1524                 iput(inode);
1525                 inode = NULL;
1526         }
1527         return inode;
1528 }
1529
1530 static struct dentry *reiserfs_get_dentry(struct super_block *sb,
1531         u32 objectid, u32 dir_id, u32 generation)
1532
1533 {
1534         struct cpu_key key;
1535         struct inode *inode;
1536
1537         key.on_disk_key.k_objectid = objectid;
1538         key.on_disk_key.k_dir_id = dir_id;
1539         reiserfs_write_lock(sb);
1540         inode = reiserfs_iget(sb, &key);
1541         if (inode && !IS_ERR(inode) && generation != 0 &&
1542             generation != inode->i_generation) {
1543                 iput(inode);
1544                 inode = NULL;
1545         }
1546         reiserfs_write_unlock(sb);
1547
1548         return d_obtain_alias(inode);
1549 }
1550
1551 struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1552                 int fh_len, int fh_type)
1553 {
1554         /* fhtype happens to reflect the number of u32s encoded.
1555          * due to a bug in earlier code, fhtype might indicate there
1556          * are more u32s then actually fitted.
1557          * so if fhtype seems to be more than len, reduce fhtype.
1558          * Valid types are:
1559          *   2 - objectid + dir_id - legacy support
1560          *   3 - objectid + dir_id + generation
1561          *   4 - objectid + dir_id + objectid and dirid of parent - legacy
1562          *   5 - objectid + dir_id + generation + objectid and dirid of parent
1563          *   6 - as above plus generation of directory
1564          * 6 does not fit in NFSv2 handles
1565          */
1566         if (fh_type > fh_len) {
1567                 if (fh_type != 6 || fh_len != 5)
1568                         reiserfs_warning(sb, "reiserfs-13077",
1569                                 "nfsd/reiserfs, fhtype=%d, len=%d - odd",
1570                                 fh_type, fh_len);
1571                 fh_type = 5;
1572         }
1573
1574         return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
1575                 (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
1576 }
1577
1578 struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1579                 int fh_len, int fh_type)
1580 {
1581         if (fh_type < 4)
1582                 return NULL;
1583
1584         return reiserfs_get_dentry(sb,
1585                 (fh_type >= 5) ? fid->raw[3] : fid->raw[2],
1586                 (fh_type >= 5) ? fid->raw[4] : fid->raw[3],
1587                 (fh_type == 6) ? fid->raw[5] : 0);
1588 }
1589
1590 int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
1591                        int need_parent)
1592 {
1593         struct inode *inode = dentry->d_inode;
1594         int maxlen = *lenp;
1595
1596         if (need_parent && (maxlen < 5)) {
1597                 *lenp = 5;
1598                 return 255;
1599         } else if (maxlen < 3) {
1600                 *lenp = 3;
1601                 return 255;
1602         }
1603
1604         data[0] = inode->i_ino;
1605         data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1606         data[2] = inode->i_generation;
1607         *lenp = 3;
1608         /* no room for directory info? return what we've stored so far */
1609         if (maxlen < 5 || !need_parent)
1610                 return 3;
1611
1612         spin_lock(&dentry->d_lock);
1613         inode = dentry->d_parent->d_inode;
1614         data[3] = inode->i_ino;
1615         data[4] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1616         *lenp = 5;
1617         if (maxlen >= 6) {
1618                 data[5] = inode->i_generation;
1619                 *lenp = 6;
1620         }
1621         spin_unlock(&dentry->d_lock);
1622         return *lenp;
1623 }
1624
1625 /* looks for stat data, then copies fields to it, marks the buffer
1626    containing stat data as dirty */
1627 /* reiserfs inodes are never really dirty, since the dirty inode call
1628 ** always logs them.  This call allows the VFS inode marking routines
1629 ** to properly mark inodes for datasync and such, but only actually
1630 ** does something when called for a synchronous update.
1631 */
1632 int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1633 {
1634         struct reiserfs_transaction_handle th;
1635         int jbegin_count = 1;
1636
1637         if (inode->i_sb->s_flags & MS_RDONLY)
1638                 return -EROFS;
1639         /* memory pressure can sometimes initiate write_inode calls with sync == 1,
1640          ** these cases are just when the system needs ram, not when the
1641          ** inode needs to reach disk for safety, and they can safely be
1642          ** ignored because the altered inode has already been logged.
1643          */
1644         if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) {
1645                 reiserfs_write_lock(inode->i_sb);
1646                 if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
1647                         reiserfs_update_sd(&th, inode);
1648                         journal_end_sync(&th, inode->i_sb, jbegin_count);
1649                 }
1650                 reiserfs_write_unlock(inode->i_sb);
1651         }
1652         return 0;
1653 }
1654
1655 /* stat data of new object is inserted already, this inserts the item
1656    containing "." and ".." entries */
1657 static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
1658                                   struct inode *inode,
1659                                   struct item_head *ih, struct treepath *path,
1660                                   struct inode *dir)
1661 {
1662         struct super_block *sb = th->t_super;
1663         char empty_dir[EMPTY_DIR_SIZE];
1664         char *body = empty_dir;
1665         struct cpu_key key;
1666         int retval;
1667
1668         BUG_ON(!th->t_trans_id);
1669
1670         _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
1671                       le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
1672                       TYPE_DIRENTRY, 3 /*key length */ );
1673
1674         /* compose item head for new item. Directories consist of items of
1675            old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
1676            is done by reiserfs_new_inode */
1677         if (old_format_only(sb)) {
1678                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1679                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
1680
1681                 make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
1682                                        ih->ih_key.k_objectid,
1683                                        INODE_PKEY(dir)->k_dir_id,
1684                                        INODE_PKEY(dir)->k_objectid);
1685         } else {
1686                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1687                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
1688
1689                 make_empty_dir_item(body, ih->ih_key.k_dir_id,
1690                                     ih->ih_key.k_objectid,
1691                                     INODE_PKEY(dir)->k_dir_id,
1692                                     INODE_PKEY(dir)->k_objectid);
1693         }
1694
1695         /* look for place in the tree for new item */
1696         retval = search_item(sb, &key, path);
1697         if (retval == IO_ERROR) {
1698                 reiserfs_error(sb, "vs-13080",
1699                                "i/o failure occurred creating new directory");
1700                 return -EIO;
1701         }
1702         if (retval == ITEM_FOUND) {
1703                 pathrelse(path);
1704                 reiserfs_warning(sb, "vs-13070",
1705                                  "object with this key exists (%k)",
1706                                  &(ih->ih_key));
1707                 return -EEXIST;
1708         }
1709
1710         /* insert item, that is empty directory item */
1711         return reiserfs_insert_item(th, path, &key, ih, inode, body);
1712 }
1713
1714 /* stat data of object has been inserted, this inserts the item
1715    containing the body of symlink */
1716 static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode,    /* Inode of symlink */
1717                                 struct item_head *ih,
1718                                 struct treepath *path, const char *symname,
1719                                 int item_len)
1720 {
1721         struct super_block *sb = th->t_super;
1722         struct cpu_key key;
1723         int retval;
1724
1725         BUG_ON(!th->t_trans_id);
1726
1727         _make_cpu_key(&key, KEY_FORMAT_3_5,
1728                       le32_to_cpu(ih->ih_key.k_dir_id),
1729                       le32_to_cpu(ih->ih_key.k_objectid),
1730                       1, TYPE_DIRECT, 3 /*key length */ );
1731
1732         make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
1733                           0 /*free_space */ );
1734
1735         /* look for place in the tree for new item */
1736         retval = search_item(sb, &key, path);
1737         if (retval == IO_ERROR) {
1738                 reiserfs_error(sb, "vs-13080",
1739                                "i/o failure occurred creating new symlink");
1740                 return -EIO;
1741         }
1742         if (retval == ITEM_FOUND) {
1743                 pathrelse(path);
1744                 reiserfs_warning(sb, "vs-13080",
1745                                  "object with this key exists (%k)",
1746                                  &(ih->ih_key));
1747                 return -EEXIST;
1748         }
1749
1750         /* insert item, that is body of symlink */
1751         return reiserfs_insert_item(th, path, &key, ih, inode, symname);
1752 }
1753
1754 /* inserts the stat data into the tree, and then calls
1755    reiserfs_new_directory (to insert ".", ".." item if new object is
1756    directory) or reiserfs_new_symlink (to insert symlink body if new
1757    object is symlink) or nothing (if new object is regular file)
1758
1759    NOTE! uid and gid must already be set in the inode.  If we return
1760    non-zero due to an error, we have to drop the quota previously allocated
1761    for the fresh inode.  This can only be done outside a transaction, so
1762    if we return non-zero, we also end the transaction.  */
1763 int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1764                        struct inode *dir, int mode, const char *symname,
1765                        /* 0 for regular, EMTRY_DIR_SIZE for dirs,
1766                           strlen (symname) for symlinks) */
1767                        loff_t i_size, struct dentry *dentry,
1768                        struct inode *inode,
1769                        struct reiserfs_security_handle *security)
1770 {
1771         struct super_block *sb;
1772         struct reiserfs_iget_args args;
1773         INITIALIZE_PATH(path_to_key);
1774         struct cpu_key key;
1775         struct item_head ih;
1776         struct stat_data sd;
1777         int retval;
1778         int err;
1779
1780         BUG_ON(!th->t_trans_id);
1781
1782         dquot_initialize(inode);
1783         err = dquot_alloc_inode(inode);
1784         if (err)
1785                 goto out_end_trans;
1786         if (!dir->i_nlink) {
1787                 err = -EPERM;
1788                 goto out_bad_inode;
1789         }
1790
1791         sb = dir->i_sb;
1792
1793         /* item head of new item */
1794         ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
1795         ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
1796         if (!ih.ih_key.k_objectid) {
1797                 err = -ENOMEM;
1798                 goto out_bad_inode;
1799         }
1800         args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
1801         if (old_format_only(sb))
1802                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
1803                                   TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
1804         else
1805                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
1806                                   TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
1807         memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
1808         args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
1809         if (insert_inode_locked4(inode, args.objectid,
1810                              reiserfs_find_actor, &args) < 0) {
1811                 err = -EINVAL;
1812                 goto out_bad_inode;
1813         }
1814         if (old_format_only(sb))
1815                 /* not a perfect generation count, as object ids can be reused, but
1816                  ** this is as good as reiserfs can do right now.
1817                  ** note that the private part of inode isn't filled in yet, we have
1818                  ** to use the directory.
1819                  */
1820                 inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
1821         else
1822 #if defined( USE_INODE_GENERATION_COUNTER )
1823                 inode->i_generation =
1824                     le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
1825 #else
1826                 inode->i_generation = ++event;
1827 #endif
1828
1829         /* fill stat data */
1830         inode->i_nlink = (S_ISDIR(mode) ? 2 : 1);
1831
1832         /* uid and gid must already be set by the caller for quota init */
1833
1834         /* symlink cannot be immutable or append only, right? */
1835         if (S_ISLNK(inode->i_mode))
1836                 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
1837
1838         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1839         inode->i_size = i_size;
1840         inode->i_blocks = 0;
1841         inode->i_bytes = 0;
1842         REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
1843             U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
1844
1845         INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1846         REISERFS_I(inode)->i_flags = 0;
1847         REISERFS_I(inode)->i_prealloc_block = 0;
1848         REISERFS_I(inode)->i_prealloc_count = 0;
1849         REISERFS_I(inode)->i_trans_id = 0;
1850         REISERFS_I(inode)->i_jl = NULL;
1851         REISERFS_I(inode)->i_attrs =
1852             REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
1853         sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
1854         reiserfs_init_xattr_rwsem(inode);
1855
1856         /* key to search for correct place for new stat data */
1857         _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
1858                       le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
1859                       TYPE_STAT_DATA, 3 /*key length */ );
1860
1861         /* find proper place for inserting of stat data */
1862         retval = search_item(sb, &key, &path_to_key);
1863         if (retval == IO_ERROR) {
1864                 err = -EIO;
1865                 goto out_bad_inode;
1866         }
1867         if (retval == ITEM_FOUND) {
1868                 pathrelse(&path_to_key);
1869                 err = -EEXIST;
1870                 goto out_bad_inode;
1871         }
1872         if (old_format_only(sb)) {
1873                 if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
1874                         pathrelse(&path_to_key);
1875                         /* i_uid or i_gid is too big to be stored in stat data v3.5 */
1876                         err = -EINVAL;
1877                         goto out_bad_inode;
1878                 }
1879                 inode2sd_v1(&sd, inode, inode->i_size);
1880         } else {
1881                 inode2sd(&sd, inode, inode->i_size);
1882         }
1883         // store in in-core inode the key of stat data and version all
1884         // object items will have (directory items will have old offset
1885         // format, other new objects will consist of new items)
1886         if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
1887                 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1888         else
1889                 set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1890         if (old_format_only(sb))
1891                 set_inode_sd_version(inode, STAT_DATA_V1);
1892         else
1893                 set_inode_sd_version(inode, STAT_DATA_V2);
1894
1895         /* insert the stat data into the tree */
1896 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
1897         if (REISERFS_I(dir)->new_packing_locality)
1898                 th->displace_new_blocks = 1;
1899 #endif
1900         retval =
1901             reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
1902                                  (char *)(&sd));
1903         if (retval) {
1904                 err = retval;
1905                 reiserfs_check_path(&path_to_key);
1906                 goto out_bad_inode;
1907         }
1908 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
1909         if (!th->displace_new_blocks)
1910                 REISERFS_I(dir)->new_packing_locality = 0;
1911 #endif
1912         if (S_ISDIR(mode)) {
1913                 /* insert item with "." and ".." */
1914                 retval =
1915                     reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
1916         }
1917
1918         if (S_ISLNK(mode)) {
1919                 /* insert body of symlink */
1920                 if (!old_format_only(sb))
1921                         i_size = ROUND_UP(i_size);
1922                 retval =
1923                     reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
1924                                          i_size);
1925         }
1926         if (retval) {
1927                 err = retval;
1928                 reiserfs_check_path(&path_to_key);
1929                 journal_end(th, th->t_super, th->t_blocks_allocated);
1930                 goto out_inserted_sd;
1931         }
1932
1933         if (reiserfs_posixacl(inode->i_sb)) {
1934                 retval = reiserfs_inherit_default_acl(th, dir, dentry, inode);
1935                 if (retval) {
1936                         err = retval;
1937                         reiserfs_check_path(&path_to_key);
1938                         journal_end(th, th->t_super, th->t_blocks_allocated);
1939                         goto out_inserted_sd;
1940                 }
1941         } else if (inode->i_sb->s_flags & MS_POSIXACL) {
1942                 reiserfs_warning(inode->i_sb, "jdm-13090",
1943                                  "ACLs aren't enabled in the fs, "
1944                                  "but vfs thinks they are!");
1945         } else if (IS_PRIVATE(dir))
1946                 inode->i_flags |= S_PRIVATE;
1947
1948         if (security->name) {
1949                 retval = reiserfs_security_write(th, inode, security);
1950                 if (retval) {
1951                         err = retval;
1952                         reiserfs_check_path(&path_to_key);
1953                         retval = journal_end(th, th->t_super,
1954                                              th->t_blocks_allocated);
1955                         if (retval)
1956                                 err = retval;
1957                         goto out_inserted_sd;
1958                 }
1959         }
1960
1961         reiserfs_update_sd(th, inode);
1962         reiserfs_check_path(&path_to_key);
1963
1964         return 0;
1965
1966 /* it looks like you can easily compress these two goto targets into
1967  * one.  Keeping it like this doesn't actually hurt anything, and they
1968  * are place holders for what the quota code actually needs.
1969  */
1970       out_bad_inode:
1971         /* Invalidate the object, nothing was inserted yet */
1972         INODE_PKEY(inode)->k_objectid = 0;
1973
1974         /* Quota change must be inside a transaction for journaling */
1975         dquot_free_inode(inode);
1976
1977       out_end_trans:
1978         journal_end(th, th->t_super, th->t_blocks_allocated);
1979         /* Drop can be outside and it needs more credits so it's better to have it outside */
1980         dquot_drop(inode);
1981         inode->i_flags |= S_NOQUOTA;
1982         make_bad_inode(inode);
1983
1984       out_inserted_sd:
1985         inode->i_nlink = 0;
1986         th->t_trans_id = 0;     /* so the caller can't use this handle later */
1987         unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
1988         iput(inode);
1989         return err;
1990 }
1991
1992 /*
1993 ** finds the tail page in the page cache,
1994 ** reads the last block in.
1995 **
1996 ** On success, page_result is set to a locked, pinned page, and bh_result
1997 ** is set to an up to date buffer for the last block in the file.  returns 0.
1998 **
1999 ** tail conversion is not done, so bh_result might not be valid for writing
2000 ** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
2001 ** trying to write the block.
2002 **
2003 ** on failure, nonzero is returned, page_result and bh_result are untouched.
2004 */
2005 static int grab_tail_page(struct inode *inode,
2006                           struct page **page_result,
2007                           struct buffer_head **bh_result)
2008 {
2009
2010         /* we want the page with the last byte in the file,
2011          ** not the page that will hold the next byte for appending
2012          */
2013         unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
2014         unsigned long pos = 0;
2015         unsigned long start = 0;
2016         unsigned long blocksize = inode->i_sb->s_blocksize;
2017         unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1);
2018         struct buffer_head *bh;
2019         struct buffer_head *head;
2020         struct page *page;
2021         int error;
2022
2023         /* we know that we are only called with inode->i_size > 0.
2024          ** we also know that a file tail can never be as big as a block
2025          ** If i_size % blocksize == 0, our file is currently block aligned
2026          ** and it won't need converting or zeroing after a truncate.
2027          */
2028         if ((offset & (blocksize - 1)) == 0) {
2029                 return -ENOENT;
2030         }
2031         page = grab_cache_page(inode->i_mapping, index);
2032         error = -ENOMEM;
2033         if (!page) {
2034                 goto out;
2035         }
2036         /* start within the page of the last block in the file */
2037         start = (offset / blocksize) * blocksize;
2038
2039         error = __block_write_begin(page, start, offset - start,
2040                                     reiserfs_get_block_create_0);
2041         if (error)
2042                 goto unlock;
2043
2044         head = page_buffers(page);
2045         bh = head;
2046         do {
2047                 if (pos >= start) {
2048                         break;
2049                 }
2050                 bh = bh->b_this_page;
2051                 pos += blocksize;
2052         } while (bh != head);
2053
2054         if (!buffer_uptodate(bh)) {
2055                 /* note, this should never happen, prepare_write should
2056                  ** be taking care of this for us.  If the buffer isn't up to date,
2057                  ** I've screwed up the code to find the buffer, or the code to
2058                  ** call prepare_write
2059                  */
2060                 reiserfs_error(inode->i_sb, "clm-6000",
2061                                "error reading block %lu", bh->b_blocknr);
2062                 error = -EIO;
2063                 goto unlock;
2064         }
2065         *bh_result = bh;
2066         *page_result = page;
2067
2068       out:
2069         return error;
2070
2071       unlock:
2072         unlock_page(page);
2073         page_cache_release(page);
2074         return error;
2075 }
2076
2077 /*
2078 ** vfs version of truncate file.  Must NOT be called with
2079 ** a transaction already started.
2080 **
2081 ** some code taken from block_truncate_page
2082 */
2083 int reiserfs_truncate_file(struct inode *inode, int update_timestamps)
2084 {
2085         struct reiserfs_transaction_handle th;
2086         /* we want the offset for the first byte after the end of the file */
2087         unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2088         unsigned blocksize = inode->i_sb->s_blocksize;
2089         unsigned length;
2090         struct page *page = NULL;
2091         int error;
2092         struct buffer_head *bh = NULL;
2093         int err2;
2094         int lock_depth;
2095
2096         lock_depth = reiserfs_write_lock_once(inode->i_sb);
2097
2098         if (inode->i_size > 0) {
2099                 error = grab_tail_page(inode, &page, &bh);
2100                 if (error) {
2101                         // -ENOENT means we truncated past the end of the file,
2102                         // and get_block_create_0 could not find a block to read in,
2103                         // which is ok.
2104                         if (error != -ENOENT)
2105                                 reiserfs_error(inode->i_sb, "clm-6001",
2106                                                "grab_tail_page failed %d",
2107                                                error);
2108                         page = NULL;
2109                         bh = NULL;
2110                 }
2111         }
2112
2113         /* so, if page != NULL, we have a buffer head for the offset at
2114          ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
2115          ** then we have an unformatted node.  Otherwise, we have a direct item,
2116          ** and no zeroing is required on disk.  We zero after the truncate,
2117          ** because the truncate might pack the item anyway
2118          ** (it will unmap bh if it packs).
2119          */
2120         /* it is enough to reserve space in transaction for 2 balancings:
2121            one for "save" link adding and another for the first
2122            cut_from_item. 1 is for update_sd */
2123         error = journal_begin(&th, inode->i_sb,
2124                               JOURNAL_PER_BALANCE_CNT * 2 + 1);
2125         if (error)
2126                 goto out;
2127         reiserfs_update_inode_transaction(inode);
2128         if (update_timestamps)
2129                 /* we are doing real truncate: if the system crashes before the last
2130                    transaction of truncating gets committed - on reboot the file
2131                    either appears truncated properly or not truncated at all */
2132                 add_save_link(&th, inode, 1);
2133         err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps);
2134         error =
2135             journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
2136         if (error)
2137                 goto out;
2138
2139         /* check reiserfs_do_truncate after ending the transaction */
2140         if (err2) {
2141                 error = err2;
2142                 goto out;
2143         }
2144
2145         if (update_timestamps) {
2146                 error = remove_save_link(inode, 1 /* truncate */);
2147                 if (error)
2148                         goto out;
2149         }
2150
2151         if (page) {
2152                 length = offset & (blocksize - 1);
2153                 /* if we are not on a block boundary */
2154                 if (length) {
2155                         length = blocksize - length;
2156                         zero_user(page, offset, length);
2157                         if (buffer_mapped(bh) && bh->b_blocknr != 0) {
2158                                 mark_buffer_dirty(bh);
2159                         }
2160                 }
2161                 unlock_page(page);
2162                 page_cache_release(page);
2163         }
2164
2165         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2166
2167         return 0;
2168       out:
2169         if (page) {
2170                 unlock_page(page);
2171                 page_cache_release(page);
2172         }
2173
2174         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2175
2176         return error;
2177 }
2178
2179 static int map_block_for_writepage(struct inode *inode,
2180                                    struct buffer_head *bh_result,
2181                                    unsigned long block)
2182 {
2183         struct reiserfs_transaction_handle th;
2184         int fs_gen;
2185         struct item_head tmp_ih;
2186         struct item_head *ih;
2187         struct buffer_head *bh;
2188         __le32 *item;
2189         struct cpu_key key;
2190         INITIALIZE_PATH(path);
2191         int pos_in_item;
2192         int jbegin_count = JOURNAL_PER_BALANCE_CNT;
2193         loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
2194         int retval;
2195         int use_get_block = 0;
2196         int bytes_copied = 0;
2197         int copy_size;
2198         int trans_running = 0;
2199
2200         /* catch places below that try to log something without starting a trans */
2201         th.t_trans_id = 0;
2202
2203         if (!buffer_uptodate(bh_result)) {
2204                 return -EIO;
2205         }
2206
2207         kmap(bh_result->b_page);
2208       start_over:
2209         reiserfs_write_lock(inode->i_sb);
2210         make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
2211
2212       research:
2213         retval = search_for_position_by_key(inode->i_sb, &key, &path);
2214         if (retval != POSITION_FOUND) {
2215                 use_get_block = 1;
2216                 goto out;
2217         }
2218
2219         bh = get_last_bh(&path);
2220         ih = get_ih(&path);
2221         item = get_item(&path);
2222         pos_in_item = path.pos_in_item;
2223
2224         /* we've found an unformatted node */
2225         if (indirect_item_found(retval, ih)) {
2226                 if (bytes_copied > 0) {
2227                         reiserfs_warning(inode->i_sb, "clm-6002",
2228                                          "bytes_copied %d", bytes_copied);
2229                 }
2230                 if (!get_block_num(item, pos_in_item)) {
2231                         /* crap, we are writing to a hole */
2232                         use_get_block = 1;
2233                         goto out;
2234                 }
2235                 set_block_dev_mapped(bh_result,
2236                                      get_block_num(item, pos_in_item), inode);
2237         } else if (is_direct_le_ih(ih)) {
2238                 char *p;
2239                 p = page_address(bh_result->b_page);
2240                 p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
2241                 copy_size = ih_item_len(ih) - pos_in_item;
2242
2243                 fs_gen = get_generation(inode->i_sb);
2244                 copy_item_head(&tmp_ih, ih);
2245
2246                 if (!trans_running) {
2247                         /* vs-3050 is gone, no need to drop the path */
2248                         retval = journal_begin(&th, inode->i_sb, jbegin_count);
2249                         if (retval)
2250                                 goto out;
2251                         reiserfs_update_inode_transaction(inode);
2252                         trans_running = 1;
2253                         if (fs_changed(fs_gen, inode->i_sb)
2254                             && item_moved(&tmp_ih, &path)) {
2255                                 reiserfs_restore_prepared_buffer(inode->i_sb,
2256                                                                  bh);
2257                                 goto research;
2258                         }
2259                 }
2260
2261                 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
2262
2263                 if (fs_changed(fs_gen, inode->i_sb)
2264                     && item_moved(&tmp_ih, &path)) {
2265                         reiserfs_restore_prepared_buffer(inode->i_sb, bh);
2266                         goto research;
2267                 }
2268
2269                 memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied,
2270                        copy_size);
2271
2272                 journal_mark_dirty(&th, inode->i_sb, bh);
2273                 bytes_copied += copy_size;
2274                 set_block_dev_mapped(bh_result, 0, inode);
2275
2276                 /* are there still bytes left? */
2277                 if (bytes_copied < bh_result->b_size &&
2278                     (byte_offset + bytes_copied) < inode->i_size) {
2279                         set_cpu_key_k_offset(&key,
2280                                              cpu_key_k_offset(&key) +
2281                                              copy_size);
2282                         goto research;
2283                 }
2284         } else {
2285                 reiserfs_warning(inode->i_sb, "clm-6003",
2286                                  "bad item inode %lu", inode->i_ino);
2287                 retval = -EIO;
2288                 goto out;
2289         }
2290         retval = 0;
2291
2292       out:
2293         pathrelse(&path);
2294         if (trans_running) {
2295                 int err = journal_end(&th, inode->i_sb, jbegin_count);
2296                 if (err)
2297                         retval = err;
2298                 trans_running = 0;
2299         }
2300         reiserfs_write_unlock(inode->i_sb);
2301
2302         /* this is where we fill in holes in the file. */
2303         if (use_get_block) {
2304                 retval = reiserfs_get_block(inode, block, bh_result,
2305                                             GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
2306                                             | GET_BLOCK_NO_DANGLE);
2307                 if (!retval) {
2308                         if (!buffer_mapped(bh_result)
2309                             || bh_result->b_blocknr == 0) {
2310                                 /* get_block failed to find a mapped unformatted node. */
2311                                 use_get_block = 0;
2312                                 goto start_over;
2313                         }
2314                 }
2315         }
2316         kunmap(bh_result->b_page);
2317
2318         if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
2319                 /* we've copied data from the page into the direct item, so the
2320                  * buffer in the page is now clean, mark it to reflect that.
2321                  */
2322                 lock_buffer(bh_result);
2323                 clear_buffer_dirty(bh_result);
2324                 unlock_buffer(bh_result);
2325         }
2326         return retval;
2327 }
2328
2329 /*
2330  * mason@suse.com: updated in 2.5.54 to follow the same general io
2331  * start/recovery path as __block_write_full_page, along with special
2332  * code to handle reiserfs tails.
2333  */
2334 static int reiserfs_write_full_page(struct page *page,
2335                                     struct writeback_control *wbc)
2336 {
2337         struct inode *inode = page->mapping->host;
2338         unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
2339         int error = 0;
2340         unsigned long block;
2341         sector_t last_block;
2342         struct buffer_head *head, *bh;
2343         int partial = 0;
2344         int nr = 0;
2345         int checked = PageChecked(page);
2346         struct reiserfs_transaction_handle th;
2347         struct super_block *s = inode->i_sb;
2348         int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
2349         th.t_trans_id = 0;
2350
2351         /* no logging allowed when nonblocking or from PF_MEMALLOC */
2352         if (checked && (current->flags & PF_MEMALLOC)) {
2353                 redirty_page_for_writepage(wbc, page);
2354                 unlock_page(page);
2355                 return 0;
2356         }
2357
2358         /* The page dirty bit is cleared before writepage is called, which
2359          * means we have to tell create_empty_buffers to make dirty buffers
2360          * The page really should be up to date at this point, so tossing
2361          * in the BH_Uptodate is just a sanity check.
2362          */
2363         if (!page_has_buffers(page)) {
2364                 create_empty_buffers(page, s->s_blocksize,
2365                                      (1 << BH_Dirty) | (1 << BH_Uptodate));
2366         }
2367         head = page_buffers(page);
2368
2369         /* last page in the file, zero out any contents past the
2370          ** last byte in the file
2371          */
2372         if (page->index >= end_index) {
2373                 unsigned last_offset;
2374
2375                 last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2376                 /* no file contents in this page */
2377                 if (page->index >= end_index + 1 || !last_offset) {
2378                         unlock_page(page);
2379                         return 0;
2380                 }
2381                 zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
2382         }
2383         bh = head;
2384         block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
2385         last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
2386         /* first map all the buffers, logging any direct items we find */
2387         do {
2388                 if (block > last_block) {
2389                         /*
2390                          * This can happen when the block size is less than
2391                          * the page size.  The corresponding bytes in the page
2392                          * were zero filled above
2393                          */
2394                         clear_buffer_dirty(bh);
2395                         set_buffer_uptodate(bh);
2396                 } else if ((checked || buffer_dirty(bh)) &&
2397                            (!buffer_mapped(bh) || (buffer_mapped(bh)
2398                                                        && bh->b_blocknr ==
2399                                                        0))) {
2400                         /* not mapped yet, or it points to a direct item, search
2401                          * the btree for the mapping info, and log any direct
2402                          * items found
2403                          */
2404                         if ((error = map_block_for_writepage(inode, bh, block))) {
2405                                 goto fail;
2406                         }
2407                 }
2408                 bh = bh->b_this_page;
2409                 block++;
2410         } while (bh != head);
2411
2412         /*
2413          * we start the transaction after map_block_for_writepage,
2414          * because it can create holes in the file (an unbounded operation).
2415          * starting it here, we can make a reliable estimate for how many
2416          * blocks we're going to log
2417          */
2418         if (checked) {
2419                 ClearPageChecked(page);
2420                 reiserfs_write_lock(s);
2421                 error = journal_begin(&th, s, bh_per_page + 1);
2422                 if (error) {
2423                         reiserfs_write_unlock(s);
2424                         goto fail;
2425                 }
2426                 reiserfs_update_inode_transaction(inode);
2427         }
2428         /* now go through and lock any dirty buffers on the page */
2429         do {
2430                 get_bh(bh);
2431                 if (!buffer_mapped(bh))
2432                         continue;
2433                 if (buffer_mapped(bh) && bh->b_blocknr == 0)
2434                         continue;
2435
2436                 if (checked) {
2437                         reiserfs_prepare_for_journal(s, bh, 1);
2438                         journal_mark_dirty(&th, s, bh);
2439                         continue;
2440                 }
2441                 /* from this point on, we know the buffer is mapped to a
2442                  * real block and not a direct item
2443                  */
2444                 if (wbc->sync_mode != WB_SYNC_NONE) {
2445                         lock_buffer(bh);
2446                 } else {
2447                         if (!trylock_buffer(bh)) {
2448                                 redirty_page_for_writepage(wbc, page);
2449                                 continue;
2450                         }
2451                 }
2452                 if (test_clear_buffer_dirty(bh)) {
2453                         mark_buffer_async_write(bh);
2454                 } else {
2455                         unlock_buffer(bh);
2456                 }
2457         } while ((bh = bh->b_this_page) != head);
2458
2459         if (checked) {
2460                 error = journal_end(&th, s, bh_per_page + 1);
2461                 reiserfs_write_unlock(s);
2462                 if (error)
2463                         goto fail;
2464         }
2465         BUG_ON(PageWriteback(page));
2466         set_page_writeback(page);
2467         unlock_page(page);
2468
2469         /*
2470          * since any buffer might be the only dirty buffer on the page,
2471          * the first submit_bh can bring the page out of writeback.
2472          * be careful with the buffers.
2473          */
2474         do {
2475                 struct buffer_head *next = bh->b_this_page;
2476                 if (buffer_async_write(bh)) {
2477                         submit_bh(WRITE, bh);
2478                         nr++;
2479                 }
2480                 put_bh(bh);
2481                 bh = next;
2482         } while (bh != head);
2483
2484         error = 0;
2485       done:
2486         if (nr == 0) {
2487                 /*
2488                  * if this page only had a direct item, it is very possible for
2489                  * no io to be required without there being an error.  Or,
2490                  * someone else could have locked them and sent them down the
2491                  * pipe without locking the page
2492                  */
2493                 bh = head;
2494                 do {
2495                         if (!buffer_uptodate(bh)) {
2496                                 partial = 1;
2497                                 break;
2498                         }
2499                         bh = bh->b_this_page;
2500                 } while (bh != head);
2501                 if (!partial)
2502                         SetPageUptodate(page);
2503                 end_page_writeback(page);
2504         }
2505         return error;
2506
2507       fail:
2508         /* catches various errors, we need to make sure any valid dirty blocks
2509          * get to the media.  The page is currently locked and not marked for
2510          * writeback
2511          */
2512         ClearPageUptodate(page);
2513         bh = head;
2514         do {
2515                 get_bh(bh);
2516                 if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
2517                         lock_buffer(bh);
2518                         mark_buffer_async_write(bh);
2519                 } else {
2520                         /*
2521                          * clear any dirty bits that might have come from getting
2522                          * attached to a dirty page
2523                          */
2524                         clear_buffer_dirty(bh);
2525                 }
2526                 bh = bh->b_this_page;
2527         } while (bh != head);
2528         SetPageError(page);
2529         BUG_ON(PageWriteback(page));
2530         set_page_writeback(page);
2531         unlock_page(page);
2532         do {
2533                 struct buffer_head *next = bh->b_this_page;
2534                 if (buffer_async_write(bh)) {
2535                         clear_buffer_dirty(bh);
2536                         submit_bh(WRITE, bh);
2537                         nr++;
2538                 }
2539                 put_bh(bh);
2540                 bh = next;
2541         } while (bh != head);
2542         goto done;
2543 }
2544
2545 static int reiserfs_readpage(struct file *f, struct page *page)
2546 {
2547         return block_read_full_page(page, reiserfs_get_block);
2548 }
2549
2550 static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
2551 {
2552         struct inode *inode = page->mapping->host;
2553         reiserfs_wait_on_write_block(inode->i_sb);
2554         return reiserfs_write_full_page(page, wbc);
2555 }
2556
2557 static void reiserfs_truncate_failed_write(struct inode *inode)
2558 {
2559         truncate_inode_pages(inode->i_mapping, inode->i_size);
2560         reiserfs_truncate_file(inode, 0);
2561 }
2562
2563 static int reiserfs_write_begin(struct file *file,
2564                                 struct address_space *mapping,
2565                                 loff_t pos, unsigned len, unsigned flags,
2566                                 struct page **pagep, void **fsdata)
2567 {
2568         struct inode *inode;
2569         struct page *page;
2570         pgoff_t index;
2571         int ret;
2572         int old_ref = 0;
2573
2574         inode = mapping->host;
2575         *fsdata = 0;
2576         if (flags & AOP_FLAG_CONT_EXPAND &&
2577             (pos & (inode->i_sb->s_blocksize - 1)) == 0) {
2578                 pos ++;
2579                 *fsdata = (void *)(unsigned long)flags;
2580         }
2581
2582         index = pos >> PAGE_CACHE_SHIFT;
2583         page = grab_cache_page_write_begin(mapping, index, flags);
2584         if (!page)
2585                 return -ENOMEM;
2586         *pagep = page;
2587
2588         reiserfs_wait_on_write_block(inode->i_sb);
2589         fix_tail_page_for_writing(page);
2590         if (reiserfs_transaction_running(inode->i_sb)) {
2591                 struct reiserfs_transaction_handle *th;
2592                 th = (struct reiserfs_transaction_handle *)current->
2593                     journal_info;
2594                 BUG_ON(!th->t_refcount);
2595                 BUG_ON(!th->t_trans_id);
2596                 old_ref = th->t_refcount;
2597                 th->t_refcount++;
2598         }
2599         ret = __block_write_begin(page, pos, len, reiserfs_get_block);
2600         if (ret && reiserfs_transaction_running(inode->i_sb)) {
2601                 struct reiserfs_transaction_handle *th = current->journal_info;
2602                 /* this gets a little ugly.  If reiserfs_get_block returned an
2603                  * error and left a transacstion running, we've got to close it,
2604                  * and we've got to free handle if it was a persistent transaction.
2605                  *
2606                  * But, if we had nested into an existing transaction, we need
2607                  * to just drop the ref count on the handle.
2608                  *
2609                  * If old_ref == 0, the transaction is from reiserfs_get_block,
2610                  * and it was a persistent trans.  Otherwise, it was nested above.
2611                  */
2612                 if (th->t_refcount > old_ref) {
2613                         if (old_ref)
2614                                 th->t_refcount--;
2615                         else {
2616                                 int err;
2617                                 reiserfs_write_lock(inode->i_sb);
2618                                 err = reiserfs_end_persistent_transaction(th);
2619                                 reiserfs_write_unlock(inode->i_sb);
2620                                 if (err)
2621                                         ret = err;
2622                         }
2623                 }
2624         }
2625         if (ret) {
2626                 unlock_page(page);
2627                 page_cache_release(page);
2628                 /* Truncate allocated blocks */
2629                 reiserfs_truncate_failed_write(inode);
2630         }
2631         return ret;
2632 }
2633
2634 int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len)
2635 {
2636         struct inode *inode = page->mapping->host;
2637         int ret;
2638         int old_ref = 0;
2639
2640         reiserfs_write_unlock(inode->i_sb);
2641         reiserfs_wait_on_write_block(inode->i_sb);
2642         reiserfs_write_lock(inode->i_sb);
2643
2644         fix_tail_page_for_writing(page);
2645         if (reiserfs_transaction_running(inode->i_sb)) {
2646                 struct reiserfs_transaction_handle *th;
2647                 th = (struct reiserfs_transaction_handle *)current->
2648                     journal_info;
2649                 BUG_ON(!th->t_refcount);
2650                 BUG_ON(!th->t_trans_id);
2651                 old_ref = th->t_refcount;
2652                 th->t_refcount++;
2653         }
2654
2655         ret = __block_write_begin(page, from, len, reiserfs_get_block);
2656         if (ret && reiserfs_transaction_running(inode->i_sb)) {
2657                 struct reiserfs_transaction_handle *th = current->journal_info;
2658                 /* this gets a little ugly.  If reiserfs_get_block returned an
2659                  * error and left a transacstion running, we've got to close it,
2660                  * and we've got to free handle if it was a persistent transaction.
2661                  *
2662                  * But, if we had nested into an existing transaction, we need
2663                  * to just drop the ref count on the handle.
2664                  *
2665                  * If old_ref == 0, the transaction is from reiserfs_get_block,
2666                  * and it was a persistent trans.  Otherwise, it was nested above.
2667                  */
2668                 if (th->t_refcount > old_ref) {
2669                         if (old_ref)
2670                                 th->t_refcount--;
2671                         else {
2672                                 int err;
2673                                 reiserfs_write_lock(inode->i_sb);
2674                                 err = reiserfs_end_persistent_transaction(th);
2675                                 reiserfs_write_unlock(inode->i_sb);
2676                                 if (err)
2677                                         ret = err;
2678                         }
2679                 }
2680         }
2681         return ret;
2682
2683 }
2684
2685 static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
2686 {
2687         return generic_block_bmap(as, block, reiserfs_bmap);
2688 }
2689
2690 static int reiserfs_write_end(struct file *file, struct address_space *mapping,
2691                               loff_t pos, unsigned len, unsigned copied,
2692                               struct page *page, void *fsdata)
2693 {
2694         struct inode *inode = page->mapping->host;
2695         int ret = 0;
2696         int update_sd = 0;
2697         struct reiserfs_transaction_handle *th;
2698         unsigned start;
2699         int lock_depth = 0;
2700         bool locked = false;
2701
2702         if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
2703                 pos ++;
2704
2705         reiserfs_wait_on_write_block(inode->i_sb);
2706         if (reiserfs_transaction_running(inode->i_sb))
2707                 th = current->journal_info;
2708         else
2709                 th = NULL;
2710
2711         start = pos & (PAGE_CACHE_SIZE - 1);
2712         if (unlikely(copied < len)) {
2713                 if (!PageUptodate(page))
2714                         copied = 0;
2715
2716                 page_zero_new_buffers(page, start + copied, start + len);
2717         }
2718         flush_dcache_page(page);
2719
2720         reiserfs_commit_page(inode, page, start, start + copied);
2721
2722         /* generic_commit_write does this for us, but does not update the
2723          ** transaction tracking stuff when the size changes.  So, we have
2724          ** to do the i_size updates here.
2725          */
2726         if (pos + copied > inode->i_size) {
2727                 struct reiserfs_transaction_handle myth;
2728                 lock_depth = reiserfs_write_lock_once(inode->i_sb);
2729                 locked = true;
2730                 /* If the file have grown beyond the border where it
2731                    can have a tail, unmark it as needing a tail
2732                    packing */
2733                 if ((have_large_tails(inode->i_sb)
2734                      && inode->i_size > i_block_size(inode) * 4)
2735                     || (have_small_tails(inode->i_sb)
2736                         && inode->i_size > i_block_size(inode)))
2737                         REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2738
2739                 ret = journal_begin(&myth, inode->i_sb, 1);
2740                 if (ret)
2741                         goto journal_error;
2742
2743                 reiserfs_update_inode_transaction(inode);
2744                 inode->i_size = pos + copied;
2745                 /*
2746                  * this will just nest into our transaction.  It's important
2747                  * to use mark_inode_dirty so the inode gets pushed around on the
2748                  * dirty lists, and so that O_SYNC works as expected
2749                  */
2750                 mark_inode_dirty(inode);
2751                 reiserfs_update_sd(&myth, inode);
2752                 update_sd = 1;
2753                 ret = journal_end(&myth, inode->i_sb, 1);
2754                 if (ret)
2755                         goto journal_error;
2756         }
2757         if (th) {
2758                 if (!locked) {
2759                         lock_depth = reiserfs_write_lock_once(inode->i_sb);
2760                         locked = true;
2761                 }
2762                 if (!update_sd)
2763                         mark_inode_dirty(inode);
2764                 ret = reiserfs_end_persistent_transaction(th);
2765                 if (ret)
2766                         goto out;
2767         }
2768
2769       out:
2770         if (locked)
2771                 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2772         unlock_page(page);
2773         page_cache_release(page);
2774
2775         if (pos + len > inode->i_size)
2776                 reiserfs_truncate_failed_write(inode);
2777
2778         return ret == 0 ? copied : ret;
2779
2780       journal_error:
2781         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2782         locked = false;
2783         if (th) {
2784                 if (!update_sd)
2785                         reiserfs_update_sd(th, inode);
2786                 ret = reiserfs_end_persistent_transaction(th);
2787         }
2788         goto out;
2789 }
2790
2791 int reiserfs_commit_write(struct file *f, struct page *page,
2792                           unsigned from, unsigned to)
2793 {
2794         struct inode *inode = page->mapping->host;
2795         loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
2796         int ret = 0;
2797         int update_sd = 0;
2798         struct reiserfs_transaction_handle *th = NULL;
2799
2800         reiserfs_write_unlock(inode->i_sb);
2801         reiserfs_wait_on_write_block(inode->i_sb);
2802         reiserfs_write_lock(inode->i_sb);
2803
2804         if (reiserfs_transaction_running(inode->i_sb)) {
2805                 th = current->journal_info;
2806         }
2807         reiserfs_commit_page(inode, page, from, to);
2808
2809         /* generic_commit_write does this for us, but does not update the
2810          ** transaction tracking stuff when the size changes.  So, we have
2811          ** to do the i_size updates here.
2812          */
2813         if (pos > inode->i_size) {
2814                 struct reiserfs_transaction_handle myth;
2815                 /* If the file have grown beyond the border where it
2816                    can have a tail, unmark it as needing a tail
2817                    packing */
2818                 if ((have_large_tails(inode->i_sb)
2819                      && inode->i_size > i_block_size(inode) * 4)
2820                     || (have_small_tails(inode->i_sb)
2821                         && inode->i_size > i_block_size(inode)))
2822                         REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2823
2824                 ret = journal_begin(&myth, inode->i_sb, 1);
2825                 if (ret)
2826                         goto journal_error;
2827
2828                 reiserfs_update_inode_transaction(inode);
2829                 inode->i_size = pos;
2830                 /*
2831                  * this will just nest into our transaction.  It's important
2832                  * to use mark_inode_dirty so the inode gets pushed around on the
2833                  * dirty lists, and so that O_SYNC works as expected
2834                  */
2835                 mark_inode_dirty(inode);
2836                 reiserfs_update_sd(&myth, inode);
2837                 update_sd = 1;
2838                 ret = journal_end(&myth, inode->i_sb, 1);
2839                 if (ret)
2840                         goto journal_error;
2841         }
2842         if (th) {
2843                 if (!update_sd)
2844                         mark_inode_dirty(inode);
2845                 ret = reiserfs_end_persistent_transaction(th);
2846                 if (ret)
2847                         goto out;
2848         }
2849
2850       out:
2851         return ret;
2852
2853       journal_error:
2854         if (th) {
2855                 if (!update_sd)
2856                         reiserfs_update_sd(th, inode);
2857                 ret = reiserfs_end_persistent_transaction(th);
2858         }
2859
2860         return ret;
2861 }
2862
2863 void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
2864 {
2865         if (reiserfs_attrs(inode->i_sb)) {
2866                 if (sd_attrs & REISERFS_SYNC_FL)
2867                         inode->i_flags |= S_SYNC;
2868                 else
2869                         inode->i_flags &= ~S_SYNC;
2870                 if (sd_attrs & REISERFS_IMMUTABLE_FL)
2871                         inode->i_flags |= S_IMMUTABLE;
2872                 else
2873                         inode->i_flags &= ~S_IMMUTABLE;
2874                 if (sd_attrs & REISERFS_APPEND_FL)
2875                         inode->i_flags |= S_APPEND;
2876                 else
2877                         inode->i_flags &= ~S_APPEND;
2878                 if (sd_attrs & REISERFS_NOATIME_FL)
2879                         inode->i_flags |= S_NOATIME;
2880                 else
2881                         inode->i_flags &= ~S_NOATIME;
2882                 if (sd_attrs & REISERFS_NOTAIL_FL)
2883                         REISERFS_I(inode)->i_flags |= i_nopack_mask;
2884                 else
2885                         REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
2886         }
2887 }
2888
2889 void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
2890 {
2891         if (reiserfs_attrs(inode->i_sb)) {
2892                 if (inode->i_flags & S_IMMUTABLE)
2893                         *sd_attrs |= REISERFS_IMMUTABLE_FL;
2894                 else
2895                         *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
2896                 if (inode->i_flags & S_SYNC)
2897                         *sd_attrs |= REISERFS_SYNC_FL;
2898                 else
2899                         *sd_attrs &= ~REISERFS_SYNC_FL;
2900                 if (inode->i_flags & S_NOATIME)
2901                         *sd_attrs |= REISERFS_NOATIME_FL;
2902                 else
2903                         *sd_attrs &= ~REISERFS_NOATIME_FL;
2904                 if (REISERFS_I(inode)->i_flags & i_nopack_mask)
2905                         *sd_attrs |= REISERFS_NOTAIL_FL;
2906                 else
2907                         *sd_attrs &= ~REISERFS_NOTAIL_FL;
2908         }
2909 }
2910
2911 /* decide if this buffer needs to stay around for data logging or ordered
2912 ** write purposes
2913 */
2914 static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
2915 {
2916         int ret = 1;
2917         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
2918
2919         lock_buffer(bh);
2920         spin_lock(&j->j_dirty_buffers_lock);
2921         if (!buffer_mapped(bh)) {
2922                 goto free_jh;
2923         }
2924         /* the page is locked, and the only places that log a data buffer
2925          * also lock the page.
2926          */
2927         if (reiserfs_file_data_log(inode)) {
2928                 /*
2929                  * very conservative, leave the buffer pinned if
2930                  * anyone might need it.
2931                  */
2932                 if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
2933                         ret = 0;
2934                 }
2935         } else  if (buffer_dirty(bh)) {
2936                 struct reiserfs_journal_list *jl;
2937                 struct reiserfs_jh *jh = bh->b_private;
2938
2939                 /* why is this safe?
2940                  * reiserfs_setattr updates i_size in the on disk
2941                  * stat data before allowing vmtruncate to be called.
2942                  *
2943                  * If buffer was put onto the ordered list for this
2944                  * transaction, we know for sure either this transaction
2945                  * or an older one already has updated i_size on disk,
2946                  * and this ordered data won't be referenced in the file
2947                  * if we crash.
2948                  *
2949                  * if the buffer was put onto the ordered list for an older
2950                  * transaction, we need to leave it around
2951                  */
2952                 if (jh && (jl = jh->jl)
2953                     && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
2954                         ret = 0;
2955         }
2956       free_jh:
2957         if (ret && bh->b_private) {
2958                 reiserfs_free_jh(bh);
2959         }
2960         spin_unlock(&j->j_dirty_buffers_lock);
2961         unlock_buffer(bh);
2962         return ret;
2963 }
2964
2965 /* clm -- taken from fs/buffer.c:block_invalidate_page */
2966 static void reiserfs_invalidatepage(struct page *page, unsigned long offset)
2967 {
2968         struct buffer_head *head, *bh, *next;
2969         struct inode *inode = page->mapping->host;
2970         unsigned int curr_off = 0;
2971         int ret = 1;
2972
2973         BUG_ON(!PageLocked(page));
2974
2975         if (offset == 0)
2976                 ClearPageChecked(page);
2977
2978         if (!page_has_buffers(page))
2979                 goto out;
2980
2981         head = page_buffers(page);
2982         bh = head;
2983         do {
2984                 unsigned int next_off = curr_off + bh->b_size;
2985                 next = bh->b_this_page;
2986
2987                 /*
2988                  * is this block fully invalidated?
2989                  */
2990                 if (offset <= curr_off) {
2991                         if (invalidatepage_can_drop(inode, bh))
2992                                 reiserfs_unmap_buffer(bh);
2993                         else
2994                                 ret = 0;
2995                 }
2996                 curr_off = next_off;
2997                 bh = next;
2998         } while (bh != head);
2999
3000         /*
3001          * We release buffers only if the entire page is being invalidated.
3002          * The get_block cached value has been unconditionally invalidated,
3003          * so real IO is not possible anymore.
3004          */
3005         if (!offset && ret) {
3006                 ret = try_to_release_page(page, 0);
3007                 /* maybe should BUG_ON(!ret); - neilb */
3008         }
3009       out:
3010         return;
3011 }
3012
3013 static int reiserfs_set_page_dirty(struct page *page)
3014 {
3015         struct inode *inode = page->mapping->host;
3016         if (reiserfs_file_data_log(inode)) {
3017                 SetPageChecked(page);
3018                 return __set_page_dirty_nobuffers(page);
3019         }
3020         return __set_page_dirty_buffers(page);
3021 }
3022
3023 /*
3024  * Returns 1 if the page's buffers were dropped.  The page is locked.
3025  *
3026  * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
3027  * in the buffers at page_buffers(page).
3028  *
3029  * even in -o notail mode, we can't be sure an old mount without -o notail
3030  * didn't create files with tails.
3031  */
3032 static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
3033 {
3034         struct inode *inode = page->mapping->host;
3035         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3036         struct buffer_head *head;
3037         struct buffer_head *bh;
3038         int ret = 1;
3039
3040         WARN_ON(PageChecked(page));
3041         spin_lock(&j->j_dirty_buffers_lock);
3042         head = page_buffers(page);
3043         bh = head;
3044         do {
3045                 if (bh->b_private) {
3046                         if (!buffer_dirty(bh) && !buffer_locked(bh)) {
3047                                 reiserfs_free_jh(bh);
3048                         } else {
3049                                 ret = 0;
3050                                 break;
3051                         }
3052                 }
3053                 bh = bh->b_this_page;
3054         } while (bh != head);
3055         if (ret)
3056                 ret = try_to_free_buffers(page);
3057         spin_unlock(&j->j_dirty_buffers_lock);
3058         return ret;
3059 }
3060
3061 /* We thank Mingming Cao for helping us understand in great detail what
3062    to do in this section of the code. */
3063 static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
3064                                   const struct iovec *iov, loff_t offset,
3065                                   unsigned long nr_segs)
3066 {
3067         struct file *file = iocb->ki_filp;
3068         struct inode *inode = file->f_mapping->host;
3069         ssize_t ret;
3070
3071         ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
3072                                   offset, nr_segs,
3073                                   reiserfs_get_blocks_direct_io, NULL);
3074
3075         /*
3076          * In case of error extending write may have instantiated a few
3077          * blocks outside i_size. Trim these off again.
3078          */
3079         if (unlikely((rw & WRITE) && ret < 0)) {
3080                 loff_t isize = i_size_read(inode);
3081                 loff_t end = offset + iov_length(iov, nr_segs);
3082
3083                 if (end > isize)
3084                         vmtruncate(inode, isize);
3085         }
3086
3087         return ret;
3088 }
3089
3090 int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
3091 {
3092         struct inode *inode = dentry->d_inode;
3093         unsigned int ia_valid;
3094         int depth;
3095         int error;
3096
3097         error = inode_change_ok(inode, attr);
3098         if (error)
3099                 return error;
3100
3101         /* must be turned off for recursive notify_change calls */
3102         ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
3103
3104         depth = reiserfs_write_lock_once(inode->i_sb);
3105         if (is_quota_modification(inode, attr))
3106                 dquot_initialize(inode);
3107
3108         if (attr->ia_valid & ATTR_SIZE) {
3109                 /* version 2 items will be caught by the s_maxbytes check
3110                  ** done for us in vmtruncate
3111                  */
3112                 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
3113                     attr->ia_size > MAX_NON_LFS) {
3114                         error = -EFBIG;
3115                         goto out;
3116                 }
3117                 /* fill in hole pointers in the expanding truncate case. */
3118                 if (attr->ia_size > inode->i_size) {
3119                         error = generic_cont_expand_simple(inode, attr->ia_size);
3120                         if (REISERFS_I(inode)->i_prealloc_count > 0) {
3121                                 int err;
3122                                 struct reiserfs_transaction_handle th;
3123                                 /* we're changing at most 2 bitmaps, inode + super */
3124                                 err = journal_begin(&th, inode->i_sb, 4);
3125                                 if (!err) {
3126                                         reiserfs_discard_prealloc(&th, inode);
3127                                         err = journal_end(&th, inode->i_sb, 4);
3128                                 }
3129                                 if (err)
3130                                         error = err;
3131                         }
3132                         if (error)
3133                                 goto out;
3134                         /*
3135                          * file size is changed, ctime and mtime are
3136                          * to be updated
3137                          */
3138                         attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
3139                 }
3140         }
3141
3142         if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
3143              ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
3144             (get_inode_sd_version(inode) == STAT_DATA_V1)) {
3145                 /* stat data of format v3.5 has 16 bit uid and gid */
3146                 error = -EINVAL;
3147                 goto out;
3148         }
3149
3150         if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
3151             (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
3152                 struct reiserfs_transaction_handle th;
3153                 int jbegin_count =
3154                     2 *
3155                     (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
3156                      REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
3157                     2;
3158
3159                 error = reiserfs_chown_xattrs(inode, attr);
3160
3161                 if (error)
3162                         return error;
3163
3164                 /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
3165                 error = journal_begin(&th, inode->i_sb, jbegin_count);
3166                 if (error)
3167                         goto out;
3168                 error = dquot_transfer(inode, attr);
3169                 if (error) {
3170                         journal_end(&th, inode->i_sb, jbegin_count);
3171                         goto out;
3172                 }
3173
3174                 /* Update corresponding info in inode so that everything is in
3175                  * one transaction */
3176                 if (attr->ia_valid & ATTR_UID)
3177                         inode->i_uid = attr->ia_uid;
3178                 if (attr->ia_valid & ATTR_GID)
3179                         inode->i_gid = attr->ia_gid;
3180                 mark_inode_dirty(inode);
3181                 error = journal_end(&th, inode->i_sb, jbegin_count);
3182                 if (error)
3183                         goto out;
3184         }
3185
3186         /*
3187          * Relax the lock here, as it might truncate the
3188          * inode pages and wait for inode pages locks.
3189          * To release such page lock, the owner needs the
3190          * reiserfs lock
3191          */
3192         reiserfs_write_unlock_once(inode->i_sb, depth);
3193         if ((attr->ia_valid & ATTR_SIZE) &&
3194             attr->ia_size != i_size_read(inode))
3195                 error = vmtruncate(inode, attr->ia_size);
3196
3197         if (!error) {
3198                 setattr_copy(inode, attr);
3199                 mark_inode_dirty(inode);
3200         }
3201         depth = reiserfs_write_lock_once(inode->i_sb);
3202
3203         if (!error && reiserfs_posixacl(inode->i_sb)) {
3204                 if (attr->ia_valid & ATTR_MODE)
3205                         error = reiserfs_acl_chmod(inode);
3206         }
3207
3208       out:
3209         reiserfs_write_unlock_once(inode->i_sb, depth);
3210
3211         return error;
3212 }
3213
3214 const struct address_space_operations reiserfs_address_space_operations = {
3215         .writepage = reiserfs_writepage,
3216         .readpage = reiserfs_readpage,
3217         .readpages = reiserfs_readpages,
3218         .releasepage = reiserfs_releasepage,
3219         .invalidatepage = reiserfs_invalidatepage,
3220         .write_begin = reiserfs_write_begin,
3221         .write_end = reiserfs_write_end,
3222         .bmap = reiserfs_aop_bmap,
3223         .direct_IO = reiserfs_direct_IO,
3224         .set_page_dirty = reiserfs_set_page_dirty,
3225 };