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                 set_nlink(inode, sd_v1_nlink(sd));
1158                 inode->i_uid = sd_v1_uid(sd);
1159                 inode->i_gid = sd_v1_gid(sd);
1160                 inode->i_size = sd_v1_size(sd);
1161                 inode->i_atime.tv_sec = sd_v1_atime(sd);
1162                 inode->i_mtime.tv_sec = sd_v1_mtime(sd);
1163                 inode->i_ctime.tv_sec = sd_v1_ctime(sd);
1164                 inode->i_atime.tv_nsec = 0;
1165                 inode->i_ctime.tv_nsec = 0;
1166                 inode->i_mtime.tv_nsec = 0;
1167
1168                 inode->i_blocks = sd_v1_blocks(sd);
1169                 inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1170                 blocks = (inode->i_size + 511) >> 9;
1171                 blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
1172                 if (inode->i_blocks > blocks) {
1173                         // there was a bug in <=3.5.23 when i_blocks could take negative
1174                         // values. Starting from 3.5.17 this value could even be stored in
1175                         // stat data. For such files we set i_blocks based on file
1176                         // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be
1177                         // only updated if file's inode will ever change
1178                         inode->i_blocks = blocks;
1179                 }
1180
1181                 rdev = sd_v1_rdev(sd);
1182                 REISERFS_I(inode)->i_first_direct_byte =
1183                     sd_v1_first_direct_byte(sd);
1184                 /* an early bug in the quota code can give us an odd number for the
1185                  ** block count.  This is incorrect, fix it here.
1186                  */
1187                 if (inode->i_blocks & 1) {
1188                         inode->i_blocks++;
1189                 }
1190                 inode_set_bytes(inode,
1191                                 to_real_used_space(inode, inode->i_blocks,
1192                                                    SD_V1_SIZE));
1193                 /* nopack is initially zero for v1 objects. For v2 objects,
1194                    nopack is initialised from sd_attrs */
1195                 REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
1196         } else {
1197                 // new stat data found, but object may have old items
1198                 // (directories and symlinks)
1199                 struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih);
1200
1201                 inode->i_mode = sd_v2_mode(sd);
1202                 set_nlink(inode, sd_v2_nlink(sd));
1203                 inode->i_uid = sd_v2_uid(sd);
1204                 inode->i_size = sd_v2_size(sd);
1205                 inode->i_gid = sd_v2_gid(sd);
1206                 inode->i_mtime.tv_sec = sd_v2_mtime(sd);
1207                 inode->i_atime.tv_sec = sd_v2_atime(sd);
1208                 inode->i_ctime.tv_sec = sd_v2_ctime(sd);
1209                 inode->i_ctime.tv_nsec = 0;
1210                 inode->i_mtime.tv_nsec = 0;
1211                 inode->i_atime.tv_nsec = 0;
1212                 inode->i_blocks = sd_v2_blocks(sd);
1213                 rdev = sd_v2_rdev(sd);
1214                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1215                         inode->i_generation =
1216                             le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1217                 else
1218                         inode->i_generation = sd_v2_generation(sd);
1219
1220                 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1221                         set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1222                 else
1223                         set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1224                 REISERFS_I(inode)->i_first_direct_byte = 0;
1225                 set_inode_sd_version(inode, STAT_DATA_V2);
1226                 inode_set_bytes(inode,
1227                                 to_real_used_space(inode, inode->i_blocks,
1228                                                    SD_V2_SIZE));
1229                 /* read persistent inode attributes from sd and initialise
1230                    generic inode flags from them */
1231                 REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
1232                 sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
1233         }
1234
1235         pathrelse(path);
1236         if (S_ISREG(inode->i_mode)) {
1237                 inode->i_op = &reiserfs_file_inode_operations;
1238                 inode->i_fop = &reiserfs_file_operations;
1239                 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1240         } else if (S_ISDIR(inode->i_mode)) {
1241                 inode->i_op = &reiserfs_dir_inode_operations;
1242                 inode->i_fop = &reiserfs_dir_operations;
1243         } else if (S_ISLNK(inode->i_mode)) {
1244                 inode->i_op = &reiserfs_symlink_inode_operations;
1245                 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1246         } else {
1247                 inode->i_blocks = 0;
1248                 inode->i_op = &reiserfs_special_inode_operations;
1249                 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
1250         }
1251 }
1252
1253 // update new stat data with inode fields
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                 clear_nlink(inode);
1448                 return;
1449         }
1450
1451         init_inode(inode, &path_to_sd);
1452
1453         /* It is possible that knfsd is trying to access inode of a file
1454            that is being removed from the disk by some other thread. As we
1455            update sd on unlink all that is required is to check for nlink
1456            here. This bug was first found by Sizif when debugging
1457            SquidNG/Butterfly, forgotten, and found again after Philippe
1458            Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
1459
1460            More logical fix would require changes in fs/inode.c:iput() to
1461            remove inode from hash-table _after_ fs cleaned disk stuff up and
1462            in iget() to return NULL if I_FREEING inode is found in
1463            hash-table. */
1464         /* Currently there is one place where it's ok to meet inode with
1465            nlink==0: processing of open-unlinked and half-truncated files
1466            during mount (fs/reiserfs/super.c:finish_unfinished()). */
1467         if ((inode->i_nlink == 0) &&
1468             !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
1469                 reiserfs_warning(inode->i_sb, "vs-13075",
1470                                  "dead inode read from disk %K. "
1471                                  "This is likely to be race with knfsd. Ignore",
1472                                  &key);
1473                 reiserfs_make_bad_inode(inode);
1474         }
1475
1476         reiserfs_check_path(&path_to_sd);       /* init inode should be relsing */
1477
1478         /*
1479          * Stat data v1 doesn't support ACLs.
1480          */
1481         if (get_inode_sd_version(inode) == STAT_DATA_V1)
1482                 cache_no_acl(inode);
1483 }
1484
1485 /**
1486  * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
1487  *
1488  * @inode:    inode from hash table to check
1489  * @opaque:   "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
1490  *
1491  * This function is called by iget5_locked() to distinguish reiserfs inodes
1492  * having the same inode numbers. Such inodes can only exist due to some
1493  * error condition. One of them should be bad. Inodes with identical
1494  * inode numbers (objectids) are distinguished by parent directory ids.
1495  *
1496  */
1497 int reiserfs_find_actor(struct inode *inode, void *opaque)
1498 {
1499         struct reiserfs_iget_args *args;
1500
1501         args = opaque;
1502         /* args is already in CPU order */
1503         return (inode->i_ino == args->objectid) &&
1504             (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
1505 }
1506
1507 struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
1508 {
1509         struct inode *inode;
1510         struct reiserfs_iget_args args;
1511
1512         args.objectid = key->on_disk_key.k_objectid;
1513         args.dirid = key->on_disk_key.k_dir_id;
1514         reiserfs_write_unlock(s);
1515         inode = iget5_locked(s, key->on_disk_key.k_objectid,
1516                              reiserfs_find_actor, reiserfs_init_locked_inode,
1517                              (void *)(&args));
1518         reiserfs_write_lock(s);
1519         if (!inode)
1520                 return ERR_PTR(-ENOMEM);
1521
1522         if (inode->i_state & I_NEW) {
1523                 reiserfs_read_locked_inode(inode, &args);
1524                 unlock_new_inode(inode);
1525         }
1526
1527         if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
1528                 /* either due to i/o error or a stale NFS handle */
1529                 iput(inode);
1530                 inode = NULL;
1531         }
1532         return inode;
1533 }
1534
1535 static struct dentry *reiserfs_get_dentry(struct super_block *sb,
1536         u32 objectid, u32 dir_id, u32 generation)
1537
1538 {
1539         struct cpu_key key;
1540         struct inode *inode;
1541
1542         key.on_disk_key.k_objectid = objectid;
1543         key.on_disk_key.k_dir_id = dir_id;
1544         reiserfs_write_lock(sb);
1545         inode = reiserfs_iget(sb, &key);
1546         if (inode && !IS_ERR(inode) && generation != 0 &&
1547             generation != inode->i_generation) {
1548                 iput(inode);
1549                 inode = NULL;
1550         }
1551         reiserfs_write_unlock(sb);
1552
1553         return d_obtain_alias(inode);
1554 }
1555
1556 struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1557                 int fh_len, int fh_type)
1558 {
1559         /* fhtype happens to reflect the number of u32s encoded.
1560          * due to a bug in earlier code, fhtype might indicate there
1561          * are more u32s then actually fitted.
1562          * so if fhtype seems to be more than len, reduce fhtype.
1563          * Valid types are:
1564          *   2 - objectid + dir_id - legacy support
1565          *   3 - objectid + dir_id + generation
1566          *   4 - objectid + dir_id + objectid and dirid of parent - legacy
1567          *   5 - objectid + dir_id + generation + objectid and dirid of parent
1568          *   6 - as above plus generation of directory
1569          * 6 does not fit in NFSv2 handles
1570          */
1571         if (fh_type > fh_len) {
1572                 if (fh_type != 6 || fh_len != 5)
1573                         reiserfs_warning(sb, "reiserfs-13077",
1574                                 "nfsd/reiserfs, fhtype=%d, len=%d - odd",
1575                                 fh_type, fh_len);
1576                 fh_type = fh_len;
1577         }
1578         if (fh_len < 2)
1579                 return NULL;
1580
1581         return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
1582                 (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
1583 }
1584
1585 struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1586                 int fh_len, int fh_type)
1587 {
1588         if (fh_type > fh_len)
1589                 fh_type = fh_len;
1590         if (fh_type < 4)
1591                 return NULL;
1592
1593         return reiserfs_get_dentry(sb,
1594                 (fh_type >= 5) ? fid->raw[3] : fid->raw[2],
1595                 (fh_type >= 5) ? fid->raw[4] : fid->raw[3],
1596                 (fh_type == 6) ? fid->raw[5] : 0);
1597 }
1598
1599 int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
1600                        int need_parent)
1601 {
1602         struct inode *inode = dentry->d_inode;
1603         int maxlen = *lenp;
1604
1605         if (need_parent && (maxlen < 5)) {
1606                 *lenp = 5;
1607                 return 255;
1608         } else if (maxlen < 3) {
1609                 *lenp = 3;
1610                 return 255;
1611         }
1612
1613         data[0] = inode->i_ino;
1614         data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1615         data[2] = inode->i_generation;
1616         *lenp = 3;
1617         /* no room for directory info? return what we've stored so far */
1618         if (maxlen < 5 || !need_parent)
1619                 return 3;
1620
1621         spin_lock(&dentry->d_lock);
1622         inode = dentry->d_parent->d_inode;
1623         data[3] = inode->i_ino;
1624         data[4] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1625         *lenp = 5;
1626         if (maxlen >= 6) {
1627                 data[5] = inode->i_generation;
1628                 *lenp = 6;
1629         }
1630         spin_unlock(&dentry->d_lock);
1631         return *lenp;
1632 }
1633
1634 /* looks for stat data, then copies fields to it, marks the buffer
1635    containing stat data as dirty */
1636 /* reiserfs inodes are never really dirty, since the dirty inode call
1637 ** always logs them.  This call allows the VFS inode marking routines
1638 ** to properly mark inodes for datasync and such, but only actually
1639 ** does something when called for a synchronous update.
1640 */
1641 int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1642 {
1643         struct reiserfs_transaction_handle th;
1644         int jbegin_count = 1;
1645
1646         if (inode->i_sb->s_flags & MS_RDONLY)
1647                 return -EROFS;
1648         /* memory pressure can sometimes initiate write_inode calls with sync == 1,
1649          ** these cases are just when the system needs ram, not when the
1650          ** inode needs to reach disk for safety, and they can safely be
1651          ** ignored because the altered inode has already been logged.
1652          */
1653         if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) {
1654                 reiserfs_write_lock(inode->i_sb);
1655                 if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
1656                         reiserfs_update_sd(&th, inode);
1657                         journal_end_sync(&th, inode->i_sb, jbegin_count);
1658                 }
1659                 reiserfs_write_unlock(inode->i_sb);
1660         }
1661         return 0;
1662 }
1663
1664 /* stat data of new object is inserted already, this inserts the item
1665    containing "." and ".." entries */
1666 static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
1667                                   struct inode *inode,
1668                                   struct item_head *ih, struct treepath *path,
1669                                   struct inode *dir)
1670 {
1671         struct super_block *sb = th->t_super;
1672         char empty_dir[EMPTY_DIR_SIZE];
1673         char *body = empty_dir;
1674         struct cpu_key key;
1675         int retval;
1676
1677         BUG_ON(!th->t_trans_id);
1678
1679         _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
1680                       le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
1681                       TYPE_DIRENTRY, 3 /*key length */ );
1682
1683         /* compose item head for new item. Directories consist of items of
1684            old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
1685            is done by reiserfs_new_inode */
1686         if (old_format_only(sb)) {
1687                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1688                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
1689
1690                 make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
1691                                        ih->ih_key.k_objectid,
1692                                        INODE_PKEY(dir)->k_dir_id,
1693                                        INODE_PKEY(dir)->k_objectid);
1694         } else {
1695                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1696                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
1697
1698                 make_empty_dir_item(body, ih->ih_key.k_dir_id,
1699                                     ih->ih_key.k_objectid,
1700                                     INODE_PKEY(dir)->k_dir_id,
1701                                     INODE_PKEY(dir)->k_objectid);
1702         }
1703
1704         /* look for place in the tree for new item */
1705         retval = search_item(sb, &key, path);
1706         if (retval == IO_ERROR) {
1707                 reiserfs_error(sb, "vs-13080",
1708                                "i/o failure occurred creating new directory");
1709                 return -EIO;
1710         }
1711         if (retval == ITEM_FOUND) {
1712                 pathrelse(path);
1713                 reiserfs_warning(sb, "vs-13070",
1714                                  "object with this key exists (%k)",
1715                                  &(ih->ih_key));
1716                 return -EEXIST;
1717         }
1718
1719         /* insert item, that is empty directory item */
1720         return reiserfs_insert_item(th, path, &key, ih, inode, body);
1721 }
1722
1723 /* stat data of object has been inserted, this inserts the item
1724    containing the body of symlink */
1725 static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode,    /* Inode of symlink */
1726                                 struct item_head *ih,
1727                                 struct treepath *path, const char *symname,
1728                                 int item_len)
1729 {
1730         struct super_block *sb = th->t_super;
1731         struct cpu_key key;
1732         int retval;
1733
1734         BUG_ON(!th->t_trans_id);
1735
1736         _make_cpu_key(&key, KEY_FORMAT_3_5,
1737                       le32_to_cpu(ih->ih_key.k_dir_id),
1738                       le32_to_cpu(ih->ih_key.k_objectid),
1739                       1, TYPE_DIRECT, 3 /*key length */ );
1740
1741         make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
1742                           0 /*free_space */ );
1743
1744         /* look for place in the tree for new item */
1745         retval = search_item(sb, &key, path);
1746         if (retval == IO_ERROR) {
1747                 reiserfs_error(sb, "vs-13080",
1748                                "i/o failure occurred creating new symlink");
1749                 return -EIO;
1750         }
1751         if (retval == ITEM_FOUND) {
1752                 pathrelse(path);
1753                 reiserfs_warning(sb, "vs-13080",
1754                                  "object with this key exists (%k)",
1755                                  &(ih->ih_key));
1756                 return -EEXIST;
1757         }
1758
1759         /* insert item, that is body of symlink */
1760         return reiserfs_insert_item(th, path, &key, ih, inode, symname);
1761 }
1762
1763 /* inserts the stat data into the tree, and then calls
1764    reiserfs_new_directory (to insert ".", ".." item if new object is
1765    directory) or reiserfs_new_symlink (to insert symlink body if new
1766    object is symlink) or nothing (if new object is regular file)
1767
1768    NOTE! uid and gid must already be set in the inode.  If we return
1769    non-zero due to an error, we have to drop the quota previously allocated
1770    for the fresh inode.  This can only be done outside a transaction, so
1771    if we return non-zero, we also end the transaction.  */
1772 int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1773                        struct inode *dir, int mode, const char *symname,
1774                        /* 0 for regular, EMTRY_DIR_SIZE for dirs,
1775                           strlen (symname) for symlinks) */
1776                        loff_t i_size, struct dentry *dentry,
1777                        struct inode *inode,
1778                        struct reiserfs_security_handle *security)
1779 {
1780         struct super_block *sb;
1781         struct reiserfs_iget_args args;
1782         INITIALIZE_PATH(path_to_key);
1783         struct cpu_key key;
1784         struct item_head ih;
1785         struct stat_data sd;
1786         int retval;
1787         int err;
1788
1789         BUG_ON(!th->t_trans_id);
1790
1791         reiserfs_write_unlock(inode->i_sb);
1792         err = dquot_alloc_inode(inode);
1793         reiserfs_write_lock(inode->i_sb);
1794         if (err)
1795                 goto out_end_trans;
1796         if (!dir->i_nlink) {
1797                 err = -EPERM;
1798                 goto out_bad_inode;
1799         }
1800
1801         sb = dir->i_sb;
1802
1803         /* item head of new item */
1804         ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
1805         ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
1806         if (!ih.ih_key.k_objectid) {
1807                 err = -ENOMEM;
1808                 goto out_bad_inode;
1809         }
1810         args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
1811         if (old_format_only(sb))
1812                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
1813                                   TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
1814         else
1815                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
1816                                   TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
1817         memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
1818         args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
1819         if (insert_inode_locked4(inode, args.objectid,
1820                              reiserfs_find_actor, &args) < 0) {
1821                 err = -EINVAL;
1822                 goto out_bad_inode;
1823         }
1824         if (old_format_only(sb))
1825                 /* not a perfect generation count, as object ids can be reused, but
1826                  ** this is as good as reiserfs can do right now.
1827                  ** note that the private part of inode isn't filled in yet, we have
1828                  ** to use the directory.
1829                  */
1830                 inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
1831         else
1832 #if defined( USE_INODE_GENERATION_COUNTER )
1833                 inode->i_generation =
1834                     le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
1835 #else
1836                 inode->i_generation = ++event;
1837 #endif
1838
1839         /* fill stat data */
1840         set_nlink(inode, (S_ISDIR(mode) ? 2 : 1));
1841
1842         /* uid and gid must already be set by the caller for quota init */
1843
1844         /* symlink cannot be immutable or append only, right? */
1845         if (S_ISLNK(inode->i_mode))
1846                 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
1847
1848         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1849         inode->i_size = i_size;
1850         inode->i_blocks = 0;
1851         inode->i_bytes = 0;
1852         REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
1853             U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
1854
1855         INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1856         REISERFS_I(inode)->i_flags = 0;
1857         REISERFS_I(inode)->i_prealloc_block = 0;
1858         REISERFS_I(inode)->i_prealloc_count = 0;
1859         REISERFS_I(inode)->i_trans_id = 0;
1860         REISERFS_I(inode)->i_jl = NULL;
1861         REISERFS_I(inode)->i_attrs =
1862             REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
1863         sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
1864         reiserfs_init_xattr_rwsem(inode);
1865
1866         /* key to search for correct place for new stat data */
1867         _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
1868                       le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
1869                       TYPE_STAT_DATA, 3 /*key length */ );
1870
1871         /* find proper place for inserting of stat data */
1872         retval = search_item(sb, &key, &path_to_key);
1873         if (retval == IO_ERROR) {
1874                 err = -EIO;
1875                 goto out_bad_inode;
1876         }
1877         if (retval == ITEM_FOUND) {
1878                 pathrelse(&path_to_key);
1879                 err = -EEXIST;
1880                 goto out_bad_inode;
1881         }
1882         if (old_format_only(sb)) {
1883                 if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
1884                         pathrelse(&path_to_key);
1885                         /* i_uid or i_gid is too big to be stored in stat data v3.5 */
1886                         err = -EINVAL;
1887                         goto out_bad_inode;
1888                 }
1889                 inode2sd_v1(&sd, inode, inode->i_size);
1890         } else {
1891                 inode2sd(&sd, inode, inode->i_size);
1892         }
1893         // store in in-core inode the key of stat data and version all
1894         // object items will have (directory items will have old offset
1895         // format, other new objects will consist of new items)
1896         if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
1897                 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1898         else
1899                 set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1900         if (old_format_only(sb))
1901                 set_inode_sd_version(inode, STAT_DATA_V1);
1902         else
1903                 set_inode_sd_version(inode, STAT_DATA_V2);
1904
1905         /* insert the stat data into the tree */
1906 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
1907         if (REISERFS_I(dir)->new_packing_locality)
1908                 th->displace_new_blocks = 1;
1909 #endif
1910         retval =
1911             reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
1912                                  (char *)(&sd));
1913         if (retval) {
1914                 err = retval;
1915                 reiserfs_check_path(&path_to_key);
1916                 goto out_bad_inode;
1917         }
1918 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
1919         if (!th->displace_new_blocks)
1920                 REISERFS_I(dir)->new_packing_locality = 0;
1921 #endif
1922         if (S_ISDIR(mode)) {
1923                 /* insert item with "." and ".." */
1924                 retval =
1925                     reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
1926         }
1927
1928         if (S_ISLNK(mode)) {
1929                 /* insert body of symlink */
1930                 if (!old_format_only(sb))
1931                         i_size = ROUND_UP(i_size);
1932                 retval =
1933                     reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
1934                                          i_size);
1935         }
1936         if (retval) {
1937                 err = retval;
1938                 reiserfs_check_path(&path_to_key);
1939                 journal_end(th, th->t_super, th->t_blocks_allocated);
1940                 goto out_inserted_sd;
1941         }
1942
1943         if (reiserfs_posixacl(inode->i_sb)) {
1944                 retval = reiserfs_inherit_default_acl(th, dir, dentry, inode);
1945                 if (retval) {
1946                         err = retval;
1947                         reiserfs_check_path(&path_to_key);
1948                         journal_end(th, th->t_super, th->t_blocks_allocated);
1949                         goto out_inserted_sd;
1950                 }
1951         } else if (inode->i_sb->s_flags & MS_POSIXACL) {
1952                 reiserfs_warning(inode->i_sb, "jdm-13090",
1953                                  "ACLs aren't enabled in the fs, "
1954                                  "but vfs thinks they are!");
1955         } else if (IS_PRIVATE(dir))
1956                 inode->i_flags |= S_PRIVATE;
1957
1958         if (security->name) {
1959                 retval = reiserfs_security_write(th, inode, security);
1960                 if (retval) {
1961                         err = retval;
1962                         reiserfs_check_path(&path_to_key);
1963                         retval = journal_end(th, th->t_super,
1964                                              th->t_blocks_allocated);
1965                         if (retval)
1966                                 err = retval;
1967                         goto out_inserted_sd;
1968                 }
1969         }
1970
1971         reiserfs_update_sd(th, inode);
1972         reiserfs_check_path(&path_to_key);
1973
1974         return 0;
1975
1976 /* it looks like you can easily compress these two goto targets into
1977  * one.  Keeping it like this doesn't actually hurt anything, and they
1978  * are place holders for what the quota code actually needs.
1979  */
1980       out_bad_inode:
1981         /* Invalidate the object, nothing was inserted yet */
1982         INODE_PKEY(inode)->k_objectid = 0;
1983
1984         /* Quota change must be inside a transaction for journaling */
1985         dquot_free_inode(inode);
1986
1987       out_end_trans:
1988         journal_end(th, th->t_super, th->t_blocks_allocated);
1989         reiserfs_write_unlock(inode->i_sb);
1990         /* Drop can be outside and it needs more credits so it's better to have it outside */
1991         dquot_drop(inode);
1992         reiserfs_write_lock(inode->i_sb);
1993         inode->i_flags |= S_NOQUOTA;
1994         make_bad_inode(inode);
1995
1996       out_inserted_sd:
1997         clear_nlink(inode);
1998         th->t_trans_id = 0;     /* so the caller can't use this handle later */
1999         unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
2000         iput(inode);
2001         return err;
2002 }
2003
2004 /*
2005 ** finds the tail page in the page cache,
2006 ** reads the last block in.
2007 **
2008 ** On success, page_result is set to a locked, pinned page, and bh_result
2009 ** is set to an up to date buffer for the last block in the file.  returns 0.
2010 **
2011 ** tail conversion is not done, so bh_result might not be valid for writing
2012 ** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
2013 ** trying to write the block.
2014 **
2015 ** on failure, nonzero is returned, page_result and bh_result are untouched.
2016 */
2017 static int grab_tail_page(struct inode *inode,
2018                           struct page **page_result,
2019                           struct buffer_head **bh_result)
2020 {
2021
2022         /* we want the page with the last byte in the file,
2023          ** not the page that will hold the next byte for appending
2024          */
2025         unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
2026         unsigned long pos = 0;
2027         unsigned long start = 0;
2028         unsigned long blocksize = inode->i_sb->s_blocksize;
2029         unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1);
2030         struct buffer_head *bh;
2031         struct buffer_head *head;
2032         struct page *page;
2033         int error;
2034
2035         /* we know that we are only called with inode->i_size > 0.
2036          ** we also know that a file tail can never be as big as a block
2037          ** If i_size % blocksize == 0, our file is currently block aligned
2038          ** and it won't need converting or zeroing after a truncate.
2039          */
2040         if ((offset & (blocksize - 1)) == 0) {
2041                 return -ENOENT;
2042         }
2043         page = grab_cache_page(inode->i_mapping, index);
2044         error = -ENOMEM;
2045         if (!page) {
2046                 goto out;
2047         }
2048         /* start within the page of the last block in the file */
2049         start = (offset / blocksize) * blocksize;
2050
2051         error = __block_write_begin(page, start, offset - start,
2052                                     reiserfs_get_block_create_0);
2053         if (error)
2054                 goto unlock;
2055
2056         head = page_buffers(page);
2057         bh = head;
2058         do {
2059                 if (pos >= start) {
2060                         break;
2061                 }
2062                 bh = bh->b_this_page;
2063                 pos += blocksize;
2064         } while (bh != head);
2065
2066         if (!buffer_uptodate(bh)) {
2067                 /* note, this should never happen, prepare_write should
2068                  ** be taking care of this for us.  If the buffer isn't up to date,
2069                  ** I've screwed up the code to find the buffer, or the code to
2070                  ** call prepare_write
2071                  */
2072                 reiserfs_error(inode->i_sb, "clm-6000",
2073                                "error reading block %lu", bh->b_blocknr);
2074                 error = -EIO;
2075                 goto unlock;
2076         }
2077         *bh_result = bh;
2078         *page_result = page;
2079
2080       out:
2081         return error;
2082
2083       unlock:
2084         unlock_page(page);
2085         page_cache_release(page);
2086         return error;
2087 }
2088
2089 /*
2090 ** vfs version of truncate file.  Must NOT be called with
2091 ** a transaction already started.
2092 **
2093 ** some code taken from block_truncate_page
2094 */
2095 int reiserfs_truncate_file(struct inode *inode, int update_timestamps)
2096 {
2097         struct reiserfs_transaction_handle th;
2098         /* we want the offset for the first byte after the end of the file */
2099         unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2100         unsigned blocksize = inode->i_sb->s_blocksize;
2101         unsigned length;
2102         struct page *page = NULL;
2103         int error;
2104         struct buffer_head *bh = NULL;
2105         int err2;
2106         int lock_depth;
2107
2108         lock_depth = reiserfs_write_lock_once(inode->i_sb);
2109
2110         if (inode->i_size > 0) {
2111                 error = grab_tail_page(inode, &page, &bh);
2112                 if (error) {
2113                         // -ENOENT means we truncated past the end of the file,
2114                         // and get_block_create_0 could not find a block to read in,
2115                         // which is ok.
2116                         if (error != -ENOENT)
2117                                 reiserfs_error(inode->i_sb, "clm-6001",
2118                                                "grab_tail_page failed %d",
2119                                                error);
2120                         page = NULL;
2121                         bh = NULL;
2122                 }
2123         }
2124
2125         /* so, if page != NULL, we have a buffer head for the offset at
2126          ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
2127          ** then we have an unformatted node.  Otherwise, we have a direct item,
2128          ** and no zeroing is required on disk.  We zero after the truncate,
2129          ** because the truncate might pack the item anyway
2130          ** (it will unmap bh if it packs).
2131          */
2132         /* it is enough to reserve space in transaction for 2 balancings:
2133            one for "save" link adding and another for the first
2134            cut_from_item. 1 is for update_sd */
2135         error = journal_begin(&th, inode->i_sb,
2136                               JOURNAL_PER_BALANCE_CNT * 2 + 1);
2137         if (error)
2138                 goto out;
2139         reiserfs_update_inode_transaction(inode);
2140         if (update_timestamps)
2141                 /* we are doing real truncate: if the system crashes before the last
2142                    transaction of truncating gets committed - on reboot the file
2143                    either appears truncated properly or not truncated at all */
2144                 add_save_link(&th, inode, 1);
2145         err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps);
2146         error =
2147             journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
2148         if (error)
2149                 goto out;
2150
2151         /* check reiserfs_do_truncate after ending the transaction */
2152         if (err2) {
2153                 error = err2;
2154                 goto out;
2155         }
2156
2157         if (update_timestamps) {
2158                 error = remove_save_link(inode, 1 /* truncate */);
2159                 if (error)
2160                         goto out;
2161         }
2162
2163         if (page) {
2164                 length = offset & (blocksize - 1);
2165                 /* if we are not on a block boundary */
2166                 if (length) {
2167                         length = blocksize - length;
2168                         zero_user(page, offset, length);
2169                         if (buffer_mapped(bh) && bh->b_blocknr != 0) {
2170                                 mark_buffer_dirty(bh);
2171                         }
2172                 }
2173                 unlock_page(page);
2174                 page_cache_release(page);
2175         }
2176
2177         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2178
2179         return 0;
2180       out:
2181         if (page) {
2182                 unlock_page(page);
2183                 page_cache_release(page);
2184         }
2185
2186         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2187
2188         return error;
2189 }
2190
2191 static int map_block_for_writepage(struct inode *inode,
2192                                    struct buffer_head *bh_result,
2193                                    unsigned long block)
2194 {
2195         struct reiserfs_transaction_handle th;
2196         int fs_gen;
2197         struct item_head tmp_ih;
2198         struct item_head *ih;
2199         struct buffer_head *bh;
2200         __le32 *item;
2201         struct cpu_key key;
2202         INITIALIZE_PATH(path);
2203         int pos_in_item;
2204         int jbegin_count = JOURNAL_PER_BALANCE_CNT;
2205         loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
2206         int retval;
2207         int use_get_block = 0;
2208         int bytes_copied = 0;
2209         int copy_size;
2210         int trans_running = 0;
2211
2212         /* catch places below that try to log something without starting a trans */
2213         th.t_trans_id = 0;
2214
2215         if (!buffer_uptodate(bh_result)) {
2216                 return -EIO;
2217         }
2218
2219         kmap(bh_result->b_page);
2220       start_over:
2221         reiserfs_write_lock(inode->i_sb);
2222         make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
2223
2224       research:
2225         retval = search_for_position_by_key(inode->i_sb, &key, &path);
2226         if (retval != POSITION_FOUND) {
2227                 use_get_block = 1;
2228                 goto out;
2229         }
2230
2231         bh = get_last_bh(&path);
2232         ih = get_ih(&path);
2233         item = get_item(&path);
2234         pos_in_item = path.pos_in_item;
2235
2236         /* we've found an unformatted node */
2237         if (indirect_item_found(retval, ih)) {
2238                 if (bytes_copied > 0) {
2239                         reiserfs_warning(inode->i_sb, "clm-6002",
2240                                          "bytes_copied %d", bytes_copied);
2241                 }
2242                 if (!get_block_num(item, pos_in_item)) {
2243                         /* crap, we are writing to a hole */
2244                         use_get_block = 1;
2245                         goto out;
2246                 }
2247                 set_block_dev_mapped(bh_result,
2248                                      get_block_num(item, pos_in_item), inode);
2249         } else if (is_direct_le_ih(ih)) {
2250                 char *p;
2251                 p = page_address(bh_result->b_page);
2252                 p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
2253                 copy_size = ih_item_len(ih) - pos_in_item;
2254
2255                 fs_gen = get_generation(inode->i_sb);
2256                 copy_item_head(&tmp_ih, ih);
2257
2258                 if (!trans_running) {
2259                         /* vs-3050 is gone, no need to drop the path */
2260                         retval = journal_begin(&th, inode->i_sb, jbegin_count);
2261                         if (retval)
2262                                 goto out;
2263                         reiserfs_update_inode_transaction(inode);
2264                         trans_running = 1;
2265                         if (fs_changed(fs_gen, inode->i_sb)
2266                             && item_moved(&tmp_ih, &path)) {
2267                                 reiserfs_restore_prepared_buffer(inode->i_sb,
2268                                                                  bh);
2269                                 goto research;
2270                         }
2271                 }
2272
2273                 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
2274
2275                 if (fs_changed(fs_gen, inode->i_sb)
2276                     && item_moved(&tmp_ih, &path)) {
2277                         reiserfs_restore_prepared_buffer(inode->i_sb, bh);
2278                         goto research;
2279                 }
2280
2281                 memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied,
2282                        copy_size);
2283
2284                 journal_mark_dirty(&th, inode->i_sb, bh);
2285                 bytes_copied += copy_size;
2286                 set_block_dev_mapped(bh_result, 0, inode);
2287
2288                 /* are there still bytes left? */
2289                 if (bytes_copied < bh_result->b_size &&
2290                     (byte_offset + bytes_copied) < inode->i_size) {
2291                         set_cpu_key_k_offset(&key,
2292                                              cpu_key_k_offset(&key) +
2293                                              copy_size);
2294                         goto research;
2295                 }
2296         } else {
2297                 reiserfs_warning(inode->i_sb, "clm-6003",
2298                                  "bad item inode %lu", inode->i_ino);
2299                 retval = -EIO;
2300                 goto out;
2301         }
2302         retval = 0;
2303
2304       out:
2305         pathrelse(&path);
2306         if (trans_running) {
2307                 int err = journal_end(&th, inode->i_sb, jbegin_count);
2308                 if (err)
2309                         retval = err;
2310                 trans_running = 0;
2311         }
2312         reiserfs_write_unlock(inode->i_sb);
2313
2314         /* this is where we fill in holes in the file. */
2315         if (use_get_block) {
2316                 retval = reiserfs_get_block(inode, block, bh_result,
2317                                             GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
2318                                             | GET_BLOCK_NO_DANGLE);
2319                 if (!retval) {
2320                         if (!buffer_mapped(bh_result)
2321                             || bh_result->b_blocknr == 0) {
2322                                 /* get_block failed to find a mapped unformatted node. */
2323                                 use_get_block = 0;
2324                                 goto start_over;
2325                         }
2326                 }
2327         }
2328         kunmap(bh_result->b_page);
2329
2330         if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
2331                 /* we've copied data from the page into the direct item, so the
2332                  * buffer in the page is now clean, mark it to reflect that.
2333                  */
2334                 lock_buffer(bh_result);
2335                 clear_buffer_dirty(bh_result);
2336                 unlock_buffer(bh_result);
2337         }
2338         return retval;
2339 }
2340
2341 /*
2342  * mason@suse.com: updated in 2.5.54 to follow the same general io
2343  * start/recovery path as __block_write_full_page, along with special
2344  * code to handle reiserfs tails.
2345  */
2346 static int reiserfs_write_full_page(struct page *page,
2347                                     struct writeback_control *wbc)
2348 {
2349         struct inode *inode = page->mapping->host;
2350         unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
2351         int error = 0;
2352         unsigned long block;
2353         sector_t last_block;
2354         struct buffer_head *head, *bh;
2355         int partial = 0;
2356         int nr = 0;
2357         int checked = PageChecked(page);
2358         struct reiserfs_transaction_handle th;
2359         struct super_block *s = inode->i_sb;
2360         int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
2361         th.t_trans_id = 0;
2362
2363         /* no logging allowed when nonblocking or from PF_MEMALLOC */
2364         if (checked && (current->flags & PF_MEMALLOC)) {
2365                 redirty_page_for_writepage(wbc, page);
2366                 unlock_page(page);
2367                 return 0;
2368         }
2369
2370         /* The page dirty bit is cleared before writepage is called, which
2371          * means we have to tell create_empty_buffers to make dirty buffers
2372          * The page really should be up to date at this point, so tossing
2373          * in the BH_Uptodate is just a sanity check.
2374          */
2375         if (!page_has_buffers(page)) {
2376                 create_empty_buffers(page, s->s_blocksize,
2377                                      (1 << BH_Dirty) | (1 << BH_Uptodate));
2378         }
2379         head = page_buffers(page);
2380
2381         /* last page in the file, zero out any contents past the
2382          ** last byte in the file
2383          */
2384         if (page->index >= end_index) {
2385                 unsigned last_offset;
2386
2387                 last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2388                 /* no file contents in this page */
2389                 if (page->index >= end_index + 1 || !last_offset) {
2390                         unlock_page(page);
2391                         return 0;
2392                 }
2393                 zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
2394         }
2395         bh = head;
2396         block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
2397         last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
2398         /* first map all the buffers, logging any direct items we find */
2399         do {
2400                 if (block > last_block) {
2401                         /*
2402                          * This can happen when the block size is less than
2403                          * the page size.  The corresponding bytes in the page
2404                          * were zero filled above
2405                          */
2406                         clear_buffer_dirty(bh);
2407                         set_buffer_uptodate(bh);
2408                 } else if ((checked || buffer_dirty(bh)) &&
2409                            (!buffer_mapped(bh) || (buffer_mapped(bh)
2410                                                        && bh->b_blocknr ==
2411                                                        0))) {
2412                         /* not mapped yet, or it points to a direct item, search
2413                          * the btree for the mapping info, and log any direct
2414                          * items found
2415                          */
2416                         if ((error = map_block_for_writepage(inode, bh, block))) {
2417                                 goto fail;
2418                         }
2419                 }
2420                 bh = bh->b_this_page;
2421                 block++;
2422         } while (bh != head);
2423
2424         /*
2425          * we start the transaction after map_block_for_writepage,
2426          * because it can create holes in the file (an unbounded operation).
2427          * starting it here, we can make a reliable estimate for how many
2428          * blocks we're going to log
2429          */
2430         if (checked) {
2431                 ClearPageChecked(page);
2432                 reiserfs_write_lock(s);
2433                 error = journal_begin(&th, s, bh_per_page + 1);
2434                 if (error) {
2435                         reiserfs_write_unlock(s);
2436                         goto fail;
2437                 }
2438                 reiserfs_update_inode_transaction(inode);
2439         }
2440         /* now go through and lock any dirty buffers on the page */
2441         do {
2442                 get_bh(bh);
2443                 if (!buffer_mapped(bh))
2444                         continue;
2445                 if (buffer_mapped(bh) && bh->b_blocknr == 0)
2446                         continue;
2447
2448                 if (checked) {
2449                         reiserfs_prepare_for_journal(s, bh, 1);
2450                         journal_mark_dirty(&th, s, bh);
2451                         continue;
2452                 }
2453                 /* from this point on, we know the buffer is mapped to a
2454                  * real block and not a direct item
2455                  */
2456                 if (wbc->sync_mode != WB_SYNC_NONE) {
2457                         lock_buffer(bh);
2458                 } else {
2459                         if (!trylock_buffer(bh)) {
2460                                 redirty_page_for_writepage(wbc, page);
2461                                 continue;
2462                         }
2463                 }
2464                 if (test_clear_buffer_dirty(bh)) {
2465                         mark_buffer_async_write(bh);
2466                 } else {
2467                         unlock_buffer(bh);
2468                 }
2469         } while ((bh = bh->b_this_page) != head);
2470
2471         if (checked) {
2472                 error = journal_end(&th, s, bh_per_page + 1);
2473                 reiserfs_write_unlock(s);
2474                 if (error)
2475                         goto fail;
2476         }
2477         BUG_ON(PageWriteback(page));
2478         set_page_writeback(page);
2479         unlock_page(page);
2480
2481         /*
2482          * since any buffer might be the only dirty buffer on the page,
2483          * the first submit_bh can bring the page out of writeback.
2484          * be careful with the buffers.
2485          */
2486         do {
2487                 struct buffer_head *next = bh->b_this_page;
2488                 if (buffer_async_write(bh)) {
2489                         submit_bh(WRITE, bh);
2490                         nr++;
2491                 }
2492                 put_bh(bh);
2493                 bh = next;
2494         } while (bh != head);
2495
2496         error = 0;
2497       done:
2498         if (nr == 0) {
2499                 /*
2500                  * if this page only had a direct item, it is very possible for
2501                  * no io to be required without there being an error.  Or,
2502                  * someone else could have locked them and sent them down the
2503                  * pipe without locking the page
2504                  */
2505                 bh = head;
2506                 do {
2507                         if (!buffer_uptodate(bh)) {
2508                                 partial = 1;
2509                                 break;
2510                         }
2511                         bh = bh->b_this_page;
2512                 } while (bh != head);
2513                 if (!partial)
2514                         SetPageUptodate(page);
2515                 end_page_writeback(page);
2516         }
2517         return error;
2518
2519       fail:
2520         /* catches various errors, we need to make sure any valid dirty blocks
2521          * get to the media.  The page is currently locked and not marked for
2522          * writeback
2523          */
2524         ClearPageUptodate(page);
2525         bh = head;
2526         do {
2527                 get_bh(bh);
2528                 if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
2529                         lock_buffer(bh);
2530                         mark_buffer_async_write(bh);
2531                 } else {
2532                         /*
2533                          * clear any dirty bits that might have come from getting
2534                          * attached to a dirty page
2535                          */
2536                         clear_buffer_dirty(bh);
2537                 }
2538                 bh = bh->b_this_page;
2539         } while (bh != head);
2540         SetPageError(page);
2541         BUG_ON(PageWriteback(page));
2542         set_page_writeback(page);
2543         unlock_page(page);
2544         do {
2545                 struct buffer_head *next = bh->b_this_page;
2546                 if (buffer_async_write(bh)) {
2547                         clear_buffer_dirty(bh);
2548                         submit_bh(WRITE, bh);
2549                         nr++;
2550                 }
2551                 put_bh(bh);
2552                 bh = next;
2553         } while (bh != head);
2554         goto done;
2555 }
2556
2557 static int reiserfs_readpage(struct file *f, struct page *page)
2558 {
2559         return block_read_full_page(page, reiserfs_get_block);
2560 }
2561
2562 static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
2563 {
2564         struct inode *inode = page->mapping->host;
2565         reiserfs_wait_on_write_block(inode->i_sb);
2566         return reiserfs_write_full_page(page, wbc);
2567 }
2568
2569 static void reiserfs_truncate_failed_write(struct inode *inode)
2570 {
2571         truncate_inode_pages(inode->i_mapping, inode->i_size);
2572         reiserfs_truncate_file(inode, 0);
2573 }
2574
2575 static int reiserfs_write_begin(struct file *file,
2576                                 struct address_space *mapping,
2577                                 loff_t pos, unsigned len, unsigned flags,
2578                                 struct page **pagep, void **fsdata)
2579 {
2580         struct inode *inode;
2581         struct page *page;
2582         pgoff_t index;
2583         int ret;
2584         int old_ref = 0;
2585
2586         inode = mapping->host;
2587         *fsdata = 0;
2588         if (flags & AOP_FLAG_CONT_EXPAND &&
2589             (pos & (inode->i_sb->s_blocksize - 1)) == 0) {
2590                 pos ++;
2591                 *fsdata = (void *)(unsigned long)flags;
2592         }
2593
2594         index = pos >> PAGE_CACHE_SHIFT;
2595         page = grab_cache_page_write_begin(mapping, index, flags);
2596         if (!page)
2597                 return -ENOMEM;
2598         *pagep = page;
2599
2600         reiserfs_wait_on_write_block(inode->i_sb);
2601         fix_tail_page_for_writing(page);
2602         if (reiserfs_transaction_running(inode->i_sb)) {
2603                 struct reiserfs_transaction_handle *th;
2604                 th = (struct reiserfs_transaction_handle *)current->
2605                     journal_info;
2606                 BUG_ON(!th->t_refcount);
2607                 BUG_ON(!th->t_trans_id);
2608                 old_ref = th->t_refcount;
2609                 th->t_refcount++;
2610         }
2611         ret = __block_write_begin(page, pos, len, reiserfs_get_block);
2612         if (ret && reiserfs_transaction_running(inode->i_sb)) {
2613                 struct reiserfs_transaction_handle *th = current->journal_info;
2614                 /* this gets a little ugly.  If reiserfs_get_block returned an
2615                  * error and left a transacstion running, we've got to close it,
2616                  * and we've got to free handle if it was a persistent transaction.
2617                  *
2618                  * But, if we had nested into an existing transaction, we need
2619                  * to just drop the ref count on the handle.
2620                  *
2621                  * If old_ref == 0, the transaction is from reiserfs_get_block,
2622                  * and it was a persistent trans.  Otherwise, it was nested above.
2623                  */
2624                 if (th->t_refcount > old_ref) {
2625                         if (old_ref)
2626                                 th->t_refcount--;
2627                         else {
2628                                 int err;
2629                                 reiserfs_write_lock(inode->i_sb);
2630                                 err = reiserfs_end_persistent_transaction(th);
2631                                 reiserfs_write_unlock(inode->i_sb);
2632                                 if (err)
2633                                         ret = err;
2634                         }
2635                 }
2636         }
2637         if (ret) {
2638                 unlock_page(page);
2639                 page_cache_release(page);
2640                 /* Truncate allocated blocks */
2641                 reiserfs_truncate_failed_write(inode);
2642         }
2643         return ret;
2644 }
2645
2646 int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len)
2647 {
2648         struct inode *inode = page->mapping->host;
2649         int ret;
2650         int old_ref = 0;
2651
2652         reiserfs_write_unlock(inode->i_sb);
2653         reiserfs_wait_on_write_block(inode->i_sb);
2654         reiserfs_write_lock(inode->i_sb);
2655
2656         fix_tail_page_for_writing(page);
2657         if (reiserfs_transaction_running(inode->i_sb)) {
2658                 struct reiserfs_transaction_handle *th;
2659                 th = (struct reiserfs_transaction_handle *)current->
2660                     journal_info;
2661                 BUG_ON(!th->t_refcount);
2662                 BUG_ON(!th->t_trans_id);
2663                 old_ref = th->t_refcount;
2664                 th->t_refcount++;
2665         }
2666
2667         ret = __block_write_begin(page, from, len, reiserfs_get_block);
2668         if (ret && reiserfs_transaction_running(inode->i_sb)) {
2669                 struct reiserfs_transaction_handle *th = current->journal_info;
2670                 /* this gets a little ugly.  If reiserfs_get_block returned an
2671                  * error and left a transacstion running, we've got to close it,
2672                  * and we've got to free handle if it was a persistent transaction.
2673                  *
2674                  * But, if we had nested into an existing transaction, we need
2675                  * to just drop the ref count on the handle.
2676                  *
2677                  * If old_ref == 0, the transaction is from reiserfs_get_block,
2678                  * and it was a persistent trans.  Otherwise, it was nested above.
2679                  */
2680                 if (th->t_refcount > old_ref) {
2681                         if (old_ref)
2682                                 th->t_refcount--;
2683                         else {
2684                                 int err;
2685                                 reiserfs_write_lock(inode->i_sb);
2686                                 err = reiserfs_end_persistent_transaction(th);
2687                                 reiserfs_write_unlock(inode->i_sb);
2688                                 if (err)
2689                                         ret = err;
2690                         }
2691                 }
2692         }
2693         return ret;
2694
2695 }
2696
2697 static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
2698 {
2699         return generic_block_bmap(as, block, reiserfs_bmap);
2700 }
2701
2702 static int reiserfs_write_end(struct file *file, struct address_space *mapping,
2703                               loff_t pos, unsigned len, unsigned copied,
2704                               struct page *page, void *fsdata)
2705 {
2706         struct inode *inode = page->mapping->host;
2707         int ret = 0;
2708         int update_sd = 0;
2709         struct reiserfs_transaction_handle *th;
2710         unsigned start;
2711         int lock_depth = 0;
2712         bool locked = false;
2713
2714         if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
2715                 pos ++;
2716
2717         reiserfs_wait_on_write_block(inode->i_sb);
2718         if (reiserfs_transaction_running(inode->i_sb))
2719                 th = current->journal_info;
2720         else
2721                 th = NULL;
2722
2723         start = pos & (PAGE_CACHE_SIZE - 1);
2724         if (unlikely(copied < len)) {
2725                 if (!PageUptodate(page))
2726                         copied = 0;
2727
2728                 page_zero_new_buffers(page, start + copied, start + len);
2729         }
2730         flush_dcache_page(page);
2731
2732         reiserfs_commit_page(inode, page, start, start + copied);
2733
2734         /* generic_commit_write does this for us, but does not update the
2735          ** transaction tracking stuff when the size changes.  So, we have
2736          ** to do the i_size updates here.
2737          */
2738         if (pos + copied > inode->i_size) {
2739                 struct reiserfs_transaction_handle myth;
2740                 lock_depth = reiserfs_write_lock_once(inode->i_sb);
2741                 locked = true;
2742                 /* If the file have grown beyond the border where it
2743                    can have a tail, unmark it as needing a tail
2744                    packing */
2745                 if ((have_large_tails(inode->i_sb)
2746                      && inode->i_size > i_block_size(inode) * 4)
2747                     || (have_small_tails(inode->i_sb)
2748                         && inode->i_size > i_block_size(inode)))
2749                         REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2750
2751                 ret = journal_begin(&myth, inode->i_sb, 1);
2752                 if (ret)
2753                         goto journal_error;
2754
2755                 reiserfs_update_inode_transaction(inode);
2756                 inode->i_size = pos + copied;
2757                 /*
2758                  * this will just nest into our transaction.  It's important
2759                  * to use mark_inode_dirty so the inode gets pushed around on the
2760                  * dirty lists, and so that O_SYNC works as expected
2761                  */
2762                 mark_inode_dirty(inode);
2763                 reiserfs_update_sd(&myth, inode);
2764                 update_sd = 1;
2765                 ret = journal_end(&myth, inode->i_sb, 1);
2766                 if (ret)
2767                         goto journal_error;
2768         }
2769         if (th) {
2770                 if (!locked) {
2771                         lock_depth = reiserfs_write_lock_once(inode->i_sb);
2772                         locked = true;
2773                 }
2774                 if (!update_sd)
2775                         mark_inode_dirty(inode);
2776                 ret = reiserfs_end_persistent_transaction(th);
2777                 if (ret)
2778                         goto out;
2779         }
2780
2781       out:
2782         if (locked)
2783                 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2784         unlock_page(page);
2785         page_cache_release(page);
2786
2787         if (pos + len > inode->i_size)
2788                 reiserfs_truncate_failed_write(inode);
2789
2790         return ret == 0 ? copied : ret;
2791
2792       journal_error:
2793         reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2794         locked = false;
2795         if (th) {
2796                 if (!update_sd)
2797                         reiserfs_update_sd(th, inode);
2798                 ret = reiserfs_end_persistent_transaction(th);
2799         }
2800         goto out;
2801 }
2802
2803 int reiserfs_commit_write(struct file *f, struct page *page,
2804                           unsigned from, unsigned to)
2805 {
2806         struct inode *inode = page->mapping->host;
2807         loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
2808         int ret = 0;
2809         int update_sd = 0;
2810         struct reiserfs_transaction_handle *th = NULL;
2811
2812         reiserfs_write_unlock(inode->i_sb);
2813         reiserfs_wait_on_write_block(inode->i_sb);
2814         reiserfs_write_lock(inode->i_sb);
2815
2816         if (reiserfs_transaction_running(inode->i_sb)) {
2817                 th = current->journal_info;
2818         }
2819         reiserfs_commit_page(inode, page, from, to);
2820
2821         /* generic_commit_write does this for us, but does not update the
2822          ** transaction tracking stuff when the size changes.  So, we have
2823          ** to do the i_size updates here.
2824          */
2825         if (pos > inode->i_size) {
2826                 struct reiserfs_transaction_handle myth;
2827                 /* If the file have grown beyond the border where it
2828                    can have a tail, unmark it as needing a tail
2829                    packing */
2830                 if ((have_large_tails(inode->i_sb)
2831                      && inode->i_size > i_block_size(inode) * 4)
2832                     || (have_small_tails(inode->i_sb)
2833                         && inode->i_size > i_block_size(inode)))
2834                         REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2835
2836                 ret = journal_begin(&myth, inode->i_sb, 1);
2837                 if (ret)
2838                         goto journal_error;
2839
2840                 reiserfs_update_inode_transaction(inode);
2841                 inode->i_size = pos;
2842                 /*
2843                  * this will just nest into our transaction.  It's important
2844                  * to use mark_inode_dirty so the inode gets pushed around on the
2845                  * dirty lists, and so that O_SYNC works as expected
2846                  */
2847                 mark_inode_dirty(inode);
2848                 reiserfs_update_sd(&myth, inode);
2849                 update_sd = 1;
2850                 ret = journal_end(&myth, inode->i_sb, 1);
2851                 if (ret)
2852                         goto journal_error;
2853         }
2854         if (th) {
2855                 if (!update_sd)
2856                         mark_inode_dirty(inode);
2857                 ret = reiserfs_end_persistent_transaction(th);
2858                 if (ret)
2859                         goto out;
2860         }
2861
2862       out:
2863         return ret;
2864
2865       journal_error:
2866         if (th) {
2867                 if (!update_sd)
2868                         reiserfs_update_sd(th, inode);
2869                 ret = reiserfs_end_persistent_transaction(th);
2870         }
2871
2872         return ret;
2873 }
2874
2875 void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
2876 {
2877         if (reiserfs_attrs(inode->i_sb)) {
2878                 if (sd_attrs & REISERFS_SYNC_FL)
2879                         inode->i_flags |= S_SYNC;
2880                 else
2881                         inode->i_flags &= ~S_SYNC;
2882                 if (sd_attrs & REISERFS_IMMUTABLE_FL)
2883                         inode->i_flags |= S_IMMUTABLE;
2884                 else
2885                         inode->i_flags &= ~S_IMMUTABLE;
2886                 if (sd_attrs & REISERFS_APPEND_FL)
2887                         inode->i_flags |= S_APPEND;
2888                 else
2889                         inode->i_flags &= ~S_APPEND;
2890                 if (sd_attrs & REISERFS_NOATIME_FL)
2891                         inode->i_flags |= S_NOATIME;
2892                 else
2893                         inode->i_flags &= ~S_NOATIME;
2894                 if (sd_attrs & REISERFS_NOTAIL_FL)
2895                         REISERFS_I(inode)->i_flags |= i_nopack_mask;
2896                 else
2897                         REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
2898         }
2899 }
2900
2901 void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
2902 {
2903         if (reiserfs_attrs(inode->i_sb)) {
2904                 if (inode->i_flags & S_IMMUTABLE)
2905                         *sd_attrs |= REISERFS_IMMUTABLE_FL;
2906                 else
2907                         *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
2908                 if (inode->i_flags & S_SYNC)
2909                         *sd_attrs |= REISERFS_SYNC_FL;
2910                 else
2911                         *sd_attrs &= ~REISERFS_SYNC_FL;
2912                 if (inode->i_flags & S_NOATIME)
2913                         *sd_attrs |= REISERFS_NOATIME_FL;
2914                 else
2915                         *sd_attrs &= ~REISERFS_NOATIME_FL;
2916                 if (REISERFS_I(inode)->i_flags & i_nopack_mask)
2917                         *sd_attrs |= REISERFS_NOTAIL_FL;
2918                 else
2919                         *sd_attrs &= ~REISERFS_NOTAIL_FL;
2920         }
2921 }
2922
2923 /* decide if this buffer needs to stay around for data logging or ordered
2924 ** write purposes
2925 */
2926 static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
2927 {
2928         int ret = 1;
2929         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
2930
2931         lock_buffer(bh);
2932         spin_lock(&j->j_dirty_buffers_lock);
2933         if (!buffer_mapped(bh)) {
2934                 goto free_jh;
2935         }
2936         /* the page is locked, and the only places that log a data buffer
2937          * also lock the page.
2938          */
2939         if (reiserfs_file_data_log(inode)) {
2940                 /*
2941                  * very conservative, leave the buffer pinned if
2942                  * anyone might need it.
2943                  */
2944                 if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
2945                         ret = 0;
2946                 }
2947         } else  if (buffer_dirty(bh)) {
2948                 struct reiserfs_journal_list *jl;
2949                 struct reiserfs_jh *jh = bh->b_private;
2950
2951                 /* why is this safe?
2952                  * reiserfs_setattr updates i_size in the on disk
2953                  * stat data before allowing vmtruncate to be called.
2954                  *
2955                  * If buffer was put onto the ordered list for this
2956                  * transaction, we know for sure either this transaction
2957                  * or an older one already has updated i_size on disk,
2958                  * and this ordered data won't be referenced in the file
2959                  * if we crash.
2960                  *
2961                  * if the buffer was put onto the ordered list for an older
2962                  * transaction, we need to leave it around
2963                  */
2964                 if (jh && (jl = jh->jl)
2965                     && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
2966                         ret = 0;
2967         }
2968       free_jh:
2969         if (ret && bh->b_private) {
2970                 reiserfs_free_jh(bh);
2971         }
2972         spin_unlock(&j->j_dirty_buffers_lock);
2973         unlock_buffer(bh);
2974         return ret;
2975 }
2976
2977 /* clm -- taken from fs/buffer.c:block_invalidate_page */
2978 static void reiserfs_invalidatepage(struct page *page, unsigned long offset)
2979 {
2980         struct buffer_head *head, *bh, *next;
2981         struct inode *inode = page->mapping->host;
2982         unsigned int curr_off = 0;
2983         int ret = 1;
2984
2985         BUG_ON(!PageLocked(page));
2986
2987         if (offset == 0)
2988                 ClearPageChecked(page);
2989
2990         if (!page_has_buffers(page))
2991                 goto out;
2992
2993         head = page_buffers(page);
2994         bh = head;
2995         do {
2996                 unsigned int next_off = curr_off + bh->b_size;
2997                 next = bh->b_this_page;
2998
2999                 /*
3000                  * is this block fully invalidated?
3001                  */
3002                 if (offset <= curr_off) {
3003                         if (invalidatepage_can_drop(inode, bh))
3004                                 reiserfs_unmap_buffer(bh);
3005                         else
3006                                 ret = 0;
3007                 }
3008                 curr_off = next_off;
3009                 bh = next;
3010         } while (bh != head);
3011
3012         /*
3013          * We release buffers only if the entire page is being invalidated.
3014          * The get_block cached value has been unconditionally invalidated,
3015          * so real IO is not possible anymore.
3016          */
3017         if (!offset && ret) {
3018                 ret = try_to_release_page(page, 0);
3019                 /* maybe should BUG_ON(!ret); - neilb */
3020         }
3021       out:
3022         return;
3023 }
3024
3025 static int reiserfs_set_page_dirty(struct page *page)
3026 {
3027         struct inode *inode = page->mapping->host;
3028         if (reiserfs_file_data_log(inode)) {
3029                 SetPageChecked(page);
3030                 return __set_page_dirty_nobuffers(page);
3031         }
3032         return __set_page_dirty_buffers(page);
3033 }
3034
3035 /*
3036  * Returns 1 if the page's buffers were dropped.  The page is locked.
3037  *
3038  * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
3039  * in the buffers at page_buffers(page).
3040  *
3041  * even in -o notail mode, we can't be sure an old mount without -o notail
3042  * didn't create files with tails.
3043  */
3044 static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
3045 {
3046         struct inode *inode = page->mapping->host;
3047         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3048         struct buffer_head *head;
3049         struct buffer_head *bh;
3050         int ret = 1;
3051
3052         WARN_ON(PageChecked(page));
3053         spin_lock(&j->j_dirty_buffers_lock);
3054         head = page_buffers(page);
3055         bh = head;
3056         do {
3057                 if (bh->b_private) {
3058                         if (!buffer_dirty(bh) && !buffer_locked(bh)) {
3059                                 reiserfs_free_jh(bh);
3060                         } else {
3061                                 ret = 0;
3062                                 break;
3063                         }
3064                 }
3065                 bh = bh->b_this_page;
3066         } while (bh != head);
3067         if (ret)
3068                 ret = try_to_free_buffers(page);
3069         spin_unlock(&j->j_dirty_buffers_lock);
3070         return ret;
3071 }
3072
3073 /* We thank Mingming Cao for helping us understand in great detail what
3074    to do in this section of the code. */
3075 static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
3076                                   const struct iovec *iov, loff_t offset,
3077                                   unsigned long nr_segs)
3078 {
3079         struct file *file = iocb->ki_filp;
3080         struct inode *inode = file->f_mapping->host;
3081         ssize_t ret;
3082
3083         ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
3084                                   reiserfs_get_blocks_direct_io);
3085
3086         /*
3087          * In case of error extending write may have instantiated a few
3088          * blocks outside i_size. Trim these off again.
3089          */
3090         if (unlikely((rw & WRITE) && ret < 0)) {
3091                 loff_t isize = i_size_read(inode);
3092                 loff_t end = offset + iov_length(iov, nr_segs);
3093
3094                 if ((end > isize) && inode_newsize_ok(inode, isize) == 0) {
3095                         truncate_setsize(inode, isize);
3096                         reiserfs_vfs_truncate_file(inode);
3097                 }
3098         }
3099
3100         return ret;
3101 }
3102
3103 int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
3104 {
3105         struct inode *inode = dentry->d_inode;
3106         unsigned int ia_valid;
3107         int depth;
3108         int error;
3109
3110         error = inode_change_ok(inode, attr);
3111         if (error)
3112                 return error;
3113
3114         /* must be turned off for recursive notify_change calls */
3115         ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
3116
3117         if (is_quota_modification(inode, attr))
3118                 dquot_initialize(inode);
3119         depth = reiserfs_write_lock_once(inode->i_sb);
3120         if (attr->ia_valid & ATTR_SIZE) {
3121                 /* version 2 items will be caught by the s_maxbytes check
3122                  ** done for us in vmtruncate
3123                  */
3124                 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
3125                     attr->ia_size > MAX_NON_LFS) {
3126                         error = -EFBIG;
3127                         goto out;
3128                 }
3129
3130                 inode_dio_wait(inode);
3131
3132                 /* fill in hole pointers in the expanding truncate case. */
3133                 if (attr->ia_size > inode->i_size) {
3134                         error = generic_cont_expand_simple(inode, attr->ia_size);
3135                         if (REISERFS_I(inode)->i_prealloc_count > 0) {
3136                                 int err;
3137                                 struct reiserfs_transaction_handle th;
3138                                 /* we're changing at most 2 bitmaps, inode + super */
3139                                 err = journal_begin(&th, inode->i_sb, 4);
3140                                 if (!err) {
3141                                         reiserfs_discard_prealloc(&th, inode);
3142                                         err = journal_end(&th, inode->i_sb, 4);
3143                                 }
3144                                 if (err)
3145                                         error = err;
3146                         }
3147                         if (error)
3148                                 goto out;
3149                         /*
3150                          * file size is changed, ctime and mtime are
3151                          * to be updated
3152                          */
3153                         attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
3154                 }
3155         }
3156
3157         if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
3158              ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
3159             (get_inode_sd_version(inode) == STAT_DATA_V1)) {
3160                 /* stat data of format v3.5 has 16 bit uid and gid */
3161                 error = -EINVAL;
3162                 goto out;
3163         }
3164
3165         if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
3166             (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
3167                 struct reiserfs_transaction_handle th;
3168                 int jbegin_count =
3169                     2 *
3170                     (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
3171                      REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
3172                     2;
3173
3174                 error = reiserfs_chown_xattrs(inode, attr);
3175
3176                 if (error)
3177                         return error;
3178
3179                 /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
3180                 error = journal_begin(&th, inode->i_sb, jbegin_count);
3181                 if (error)
3182                         goto out;
3183                 reiserfs_write_unlock_once(inode->i_sb, depth);
3184                 error = dquot_transfer(inode, attr);
3185                 depth = reiserfs_write_lock_once(inode->i_sb);
3186                 if (error) {
3187                         journal_end(&th, inode->i_sb, jbegin_count);
3188                         goto out;
3189                 }
3190
3191                 /* Update corresponding info in inode so that everything is in
3192                  * one transaction */
3193                 if (attr->ia_valid & ATTR_UID)
3194                         inode->i_uid = attr->ia_uid;
3195                 if (attr->ia_valid & ATTR_GID)
3196                         inode->i_gid = attr->ia_gid;
3197                 mark_inode_dirty(inode);
3198                 error = journal_end(&th, inode->i_sb, jbegin_count);
3199                 if (error)
3200                         goto out;
3201         }
3202
3203         /*
3204          * Relax the lock here, as it might truncate the
3205          * inode pages and wait for inode pages locks.
3206          * To release such page lock, the owner needs the
3207          * reiserfs lock
3208          */
3209         reiserfs_write_unlock_once(inode->i_sb, depth);
3210         if ((attr->ia_valid & ATTR_SIZE) &&
3211             attr->ia_size != i_size_read(inode)) {
3212                 error = inode_newsize_ok(inode, attr->ia_size);
3213                 if (!error) {
3214                         /*
3215                          * Could race against reiserfs_file_release
3216                          * if called from NFS, so take tailpack mutex.
3217                          */
3218                         mutex_lock(&REISERFS_I(inode)->tailpack);
3219                         truncate_setsize(inode, attr->ia_size);
3220                         reiserfs_truncate_file(inode, 1);
3221                         mutex_unlock(&REISERFS_I(inode)->tailpack);
3222                 }
3223         }
3224
3225         if (!error) {
3226                 setattr_copy(inode, attr);
3227                 mark_inode_dirty(inode);
3228         }
3229         depth = reiserfs_write_lock_once(inode->i_sb);
3230
3231         if (!error && reiserfs_posixacl(inode->i_sb)) {
3232                 if (attr->ia_valid & ATTR_MODE)
3233                         error = reiserfs_acl_chmod(inode);
3234         }
3235
3236       out:
3237         reiserfs_write_unlock_once(inode->i_sb, depth);
3238
3239         return error;
3240 }
3241
3242 const struct address_space_operations reiserfs_address_space_operations = {
3243         .writepage = reiserfs_writepage,
3244         .readpage = reiserfs_readpage,
3245         .readpages = reiserfs_readpages,
3246         .releasepage = reiserfs_releasepage,
3247         .invalidatepage = reiserfs_invalidatepage,
3248         .write_begin = reiserfs_write_begin,
3249         .write_end = reiserfs_write_end,
3250         .bmap = reiserfs_aop_bmap,
3251         .direct_IO = reiserfs_direct_IO,
3252         .set_page_dirty = reiserfs_set_page_dirty,
3253 };