kernel/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 "reiserfs.h"
   8 #include "acl.h"
   9 #include "xattr.h"
  10 #include <linux/exportfs.h>
  11 #include <linux/pagemap.h>
  12 #include <linux/highmem.h>
  13 #include <linux/slab.h>
  14 #include <linux/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 #include <linux/uio.h>
  22
  23 int reiserfs_commit_write(struct file *f, struct page *page,
  24                           unsigned from, unsigned to);
  25
  26 void reiserfs_evict_inode(struct inode *inode)
  27 {
  28         /*
  29          * We need blocks for transaction + (user+group) quota
  30          * update (possibly delete)
  31          */
  32         int jbegin_count =
  33             JOURNAL_PER_BALANCE_CNT * 2 +
  34             2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb);
  35         struct reiserfs_transaction_handle th;
  36         int err;
  37
  38         if (!inode->i_nlink && !is_bad_inode(inode))
  39                 dquot_initialize(inode);
  40
  41         truncate_inode_pages_final(&inode->i_data);
  42         if (inode->i_nlink)
  43                 goto no_delete;
  44
  45         /*
  46          * The = 0 happens when we abort creating a new inode
  47          * for some reason like lack of space..
  48          * also handles bad_inode case
  49          */
  50         if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) {
  51
  52                 reiserfs_delete_xattrs(inode);
  53
  54                 reiserfs_write_lock(inode->i_sb);
  55
  56                 if (journal_begin(&th, inode->i_sb, jbegin_count))
  57                         goto out;
  58                 reiserfs_update_inode_transaction(inode);
  59
  60                 reiserfs_discard_prealloc(&th, inode);
  61
  62                 err = reiserfs_delete_object(&th, inode);
  63
  64                 /*
  65                  * Do quota update inside a transaction for journaled quotas.
  66                  * We must do that after delete_object so that quota updates
  67                  * go into the same transaction as stat data deletion
  68                  */
  69                 if (!err) {
  70                         int depth = reiserfs_write_unlock_nested(inode->i_sb);
  71                         dquot_free_inode(inode);
  72                         reiserfs_write_lock_nested(inode->i_sb, depth);
  73                 }
  74
  75                 if (journal_end(&th))
  76                         goto out;
  77
  78                 /*
  79                  * check return value from reiserfs_delete_object after
  80                  * ending the transaction
  81                  */
  82                 if (err)
  83                     goto out;
  84
  85                 /*
  86                  * all items of file are deleted, so we can remove
  87                  * "save" link
  88                  * we can't do anything about an error here
  89                  */
  90                 remove_save_link(inode, 0 /* not truncate */);
  91 out:
  92                 reiserfs_write_unlock(inode->i_sb);
  93         } else {
  94                 /* no object items are in the tree */
  95                 ;
  96         }
  97
  98         /* note this must go after the journal_end to prevent deadlock */
  99         clear_inode(inode);
 100
 101         dquot_drop(inode);
 102         inode->i_blocks = 0;
 103         return;
 104
 105 no_delete:
 106         clear_inode(inode);
 107         dquot_drop(inode);
 108 }
 109
 110 static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid,
 111                           __u32 objectid, loff_t offset, int type, int length)
 112 {
 113         key->version = version;
 114
 115         key->on_disk_key.k_dir_id = dirid;
 116         key->on_disk_key.k_objectid = objectid;
 117         set_cpu_key_k_offset(key, offset);
 118         set_cpu_key_k_type(key, type);
 119         key->key_length = length;
 120 }
 121
 122 /*
 123  * take base of inode_key (it comes from inode always) (dirid, objectid)
 124  * and version from an inode, set offset and type of key
 125  */
 126 void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset,
 127                   int type, int length)
 128 {
 129         _make_cpu_key(key, get_inode_item_key_version(inode),
 130                       le32_to_cpu(INODE_PKEY(inode)->k_dir_id),
 131                       le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type,
 132                       length);
 133 }
 134
 135 /* when key is 0, do not set version and short key */
 136 inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
 137                               int version,
 138                               loff_t offset, int type, int length,
 139                               int entry_count /*or ih_free_space */ )
 140 {
 141         if (key) {
 142                 ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id);
 143                 ih->ih_key.k_objectid =
 144                     cpu_to_le32(key->on_disk_key.k_objectid);
 145         }
 146         put_ih_version(ih, version);
 147         set_le_ih_k_offset(ih, offset);
 148         set_le_ih_k_type(ih, type);
 149         put_ih_item_len(ih, length);
 150         /*    set_ih_free_space (ih, 0); */
 151         /*
 152          * for directory items it is entry count, for directs and stat
 153          * datas - 0xffff, for indirects - 0
 154          */
 155         put_ih_entry_count(ih, entry_count);
 156 }
 157
 158 /*
 159  * FIXME: we might cache recently accessed indirect item
 160  * Ugh.  Not too eager for that....
 161  * I cut the code until such time as I see a convincing argument (benchmark).
 162  * I don't want a bloated inode struct..., and I don't like code complexity....
 163  */
 164
 165 /*
 166  * cutting the code is fine, since it really isn't in use yet and is easy
 167  * to add back in.  But, Vladimir has a really good idea here.  Think
 168  * about what happens for reading a file.  For each page,
 169  * The VFS layer calls reiserfs_readpage, who searches the tree to find
 170  * an indirect item.  This indirect item has X number of pointers, where
 171  * X is a big number if we've done the block allocation right.  But,
 172  * we only use one or two of these pointers during each call to readpage,
 173  * needlessly researching again later on.
 174  *
 175  * The size of the cache could be dynamic based on the size of the file.
 176  *
 177  * I'd also like to see us cache the location the stat data item, since
 178  * we are needlessly researching for that frequently.
 179  *
 180  * --chris
 181  */
 182
 183 /*
 184  * If this page has a file tail in it, and
 185  * it was read in by get_block_create_0, the page data is valid,
 186  * but tail is still sitting in a direct item, and we can't write to
 187  * it.  So, look through this page, and check all the mapped buffers
 188  * to make sure they have valid block numbers.  Any that don't need
 189  * to be unmapped, so that __block_write_begin will correctly call
 190  * reiserfs_get_block to convert the tail into an unformatted node
 191  */
 192 static inline void fix_tail_page_for_writing(struct page *page)
 193 {
 194         struct buffer_head *head, *next, *bh;
 195
 196         if (page && page_has_buffers(page)) {
 197                 head = page_buffers(page);
 198                 bh = head;
 199                 do {
 200                         next = bh->b_this_page;
 201                         if (buffer_mapped(bh) && bh->b_blocknr == 0) {
 202                                 reiserfs_unmap_buffer(bh);
 203                         }
 204                         bh = next;
 205                 } while (bh != head);
 206         }
 207 }
 208
 209 /*
 210  * reiserfs_get_block does not need to allocate a block only if it has been
 211  * done already or non-hole position has been found in the indirect item
 212  */
 213 static inline int allocation_needed(int retval, b_blocknr_t allocated,
 214                                     struct item_head *ih,
 215                                     __le32 * item, int pos_in_item)
 216 {
 217         if (allocated)
 218                 return 0;
 219         if (retval == POSITION_FOUND && is_indirect_le_ih(ih) &&
 220             get_block_num(item, pos_in_item))
 221                 return 0;
 222         return 1;
 223 }
 224
 225 static inline int indirect_item_found(int retval, struct item_head *ih)
 226 {
 227         return (retval == POSITION_FOUND) && is_indirect_le_ih(ih);
 228 }
 229
 230 static inline void set_block_dev_mapped(struct buffer_head *bh,
 231                                         b_blocknr_t block, struct inode *inode)
 232 {
 233         map_bh(bh, inode->i_sb, block);
 234 }
 235
 236 /*
 237  * files which were created in the earlier version can not be longer,
 238  * than 2 gb
 239  */
 240 static int file_capable(struct inode *inode, sector_t block)
 241 {
 242         /* it is new file. */
 243         if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 ||
 244             /* old file, but 'block' is inside of 2gb */
 245             block < (1 << (31 - inode->i_sb->s_blocksize_bits)))
 246                 return 1;
 247
 248         return 0;
 249 }
 250
 251 static int restart_transaction(struct reiserfs_transaction_handle *th,
 252                                struct inode *inode, struct treepath *path)
 253 {
 254         struct super_block *s = th->t_super;
 255         int err;
 256
 257         BUG_ON(!th->t_trans_id);
 258         BUG_ON(!th->t_refcount);
 259
 260         pathrelse(path);
 261
 262         /* we cannot restart while nested */
 263         if (th->t_refcount > 1) {
 264                 return 0;
 265         }
 266         reiserfs_update_sd(th, inode);
 267         err = journal_end(th);
 268         if (!err) {
 269                 err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6);
 270                 if (!err)
 271                         reiserfs_update_inode_transaction(inode);
 272         }
 273         return err;
 274 }
 275
 276 /*
 277  * it is called by get_block when create == 0. Returns block number
 278  * for 'block'-th logical block of file. When it hits direct item it
 279  * returns 0 (being called from bmap) or read direct item into piece
 280  * of page (bh_result)
 281  * Please improve the english/clarity in the comment above, as it is
 282  * hard to understand.
 283  */
 284 static int _get_block_create_0(struct inode *inode, sector_t block,
 285                                struct buffer_head *bh_result, int args)
 286 {
 287         INITIALIZE_PATH(path);
 288         struct cpu_key key;
 289         struct buffer_head *bh;
 290         struct item_head *ih, tmp_ih;
 291         b_blocknr_t blocknr;
 292         char *p = NULL;
 293         int chars;
 294         int ret;
 295         int result;
 296         int done = 0;
 297         unsigned long offset;
 298
 299         /* prepare the key to look for the 'block'-th block of file */
 300         make_cpu_key(&key, inode,
 301                      (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY,
 302                      3);
 303
 304         result = search_for_position_by_key(inode->i_sb, &key, &path);
 305         if (result != POSITION_FOUND) {
 306                 pathrelse(&path);
 307                 if (p)
 308                         kunmap(bh_result->b_page);
 309                 if (result == IO_ERROR)
 310                         return -EIO;
 311                 /*
 312                  * We do not return -ENOENT if there is a hole but page is
 313                  * uptodate, because it means that there is some MMAPED data
 314                  * associated with it that is yet to be written to disk.
 315                  */
 316                 if ((args & GET_BLOCK_NO_HOLE)
 317                     && !PageUptodate(bh_result->b_page)) {
 318                         return -ENOENT;
 319                 }
 320                 return 0;
 321         }
 322
 323         bh = get_last_bh(&path);
 324         ih = tp_item_head(&path);
 325         if (is_indirect_le_ih(ih)) {
 326                 __le32 *ind_item = (__le32 *) ih_item_body(bh, ih);
 327
 328                 /*
 329                  * FIXME: here we could cache indirect item or part of it in
 330                  * the inode to avoid search_by_key in case of subsequent
 331                  * access to file
 332                  */
 333                 blocknr = get_block_num(ind_item, path.pos_in_item);
 334                 ret = 0;
 335                 if (blocknr) {
 336                         map_bh(bh_result, inode->i_sb, blocknr);
 337                         if (path.pos_in_item ==
 338                             ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) {
 339                                 set_buffer_boundary(bh_result);
 340                         }
 341                 } else
 342                         /*
 343                          * We do not return -ENOENT if there is a hole but
 344                          * page is uptodate, because it means that there is
 345                          * some MMAPED data associated with it that is
 346                          * yet to be written to disk.
 347                          */
 348                 if ((args & GET_BLOCK_NO_HOLE)
 349                             && !PageUptodate(bh_result->b_page)) {
 350                         ret = -ENOENT;
 351                 }
 352
 353                 pathrelse(&path);
 354                 if (p)
 355                         kunmap(bh_result->b_page);
 356                 return ret;
 357         }
 358         /* requested data are in direct item(s) */
 359         if (!(args & GET_BLOCK_READ_DIRECT)) {
 360                 /*
 361                  * we are called by bmap. FIXME: we can not map block of file
 362                  * when it is stored in direct item(s)
 363                  */
 364                 pathrelse(&path);
 365                 if (p)
 366                         kunmap(bh_result->b_page);
 367                 return -ENOENT;
 368         }
 369
 370         /*
 371          * if we've got a direct item, and the buffer or page was uptodate,
 372          * we don't want to pull data off disk again.  skip to the
 373          * end, where we map the buffer and return
 374          */
 375         if (buffer_uptodate(bh_result)) {
 376                 goto finished;
 377         } else
 378                 /*
 379                  * grab_tail_page can trigger calls to reiserfs_get_block on
 380                  * up to date pages without any buffers.  If the page is up
 381                  * to date, we don't want read old data off disk.  Set the up
 382                  * to date bit on the buffer instead and jump to the end
 383                  */
 384         if (!bh_result->b_page || PageUptodate(bh_result->b_page)) {
 385                 set_buffer_uptodate(bh_result);
 386                 goto finished;
 387         }
 388         /* read file tail into part of page */
 389         offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1);
 390         copy_item_head(&tmp_ih, ih);
 391
 392         /*
 393          * we only want to kmap if we are reading the tail into the page.
 394          * this is not the common case, so we don't kmap until we are
 395          * sure we need to.  But, this means the item might move if
 396          * kmap schedules
 397          */
 398         if (!p)
 399                 p = (char *)kmap(bh_result->b_page);
 400
 401         p += offset;
 402         memset(p, 0, inode->i_sb->s_blocksize);
 403         do {
 404                 if (!is_direct_le_ih(ih)) {
 405                         BUG();
 406                 }
 407                 /*
 408                  * make sure we don't read more bytes than actually exist in
 409                  * the file.  This can happen in odd cases where i_size isn't
 410                  * correct, and when direct item padding results in a few
 411                  * extra bytes at the end of the direct item
 412                  */
 413                 if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size)
 414                         break;
 415                 if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) {
 416                         chars =
 417                             inode->i_size - (le_ih_k_offset(ih) - 1) -
 418                             path.pos_in_item;
 419                         done = 1;
 420                 } else {
 421                         chars = ih_item_len(ih) - path.pos_in_item;
 422                 }
 423                 memcpy(p, ih_item_body(bh, ih) + path.pos_in_item, chars);
 424
 425                 if (done)
 426                         break;
 427
 428                 p += chars;
 429
 430                 /*
 431                  * we done, if read direct item is not the last item of
 432                  * node FIXME: we could try to check right delimiting key
 433                  * to see whether direct item continues in the right
 434                  * neighbor or rely on i_size
 435                  */
 436                 if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1))
 437                         break;
 438
 439                 /* update key to look for the next piece */
 440                 set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars);
 441                 result = search_for_position_by_key(inode->i_sb, &key, &path);
 442                 if (result != POSITION_FOUND)
 443                         /* i/o error most likely */
 444                         break;
 445                 bh = get_last_bh(&path);
 446                 ih = tp_item_head(&path);
 447         } while (1);
 448
 449         flush_dcache_page(bh_result->b_page);
 450         kunmap(bh_result->b_page);
 451
 452 finished:
 453         pathrelse(&path);
 454
 455         if (result == IO_ERROR)
 456                 return -EIO;
 457
 458         /*
 459          * this buffer has valid data, but isn't valid for io.  mapping it to
 460          * block #0 tells the rest of reiserfs it just has a tail in it
 461          */
 462         map_bh(bh_result, inode->i_sb, 0);
 463         set_buffer_uptodate(bh_result);
 464         return 0;
 465 }
 466
 467 /*
 468  * this is called to create file map. So, _get_block_create_0 will not
 469  * read direct item
 470  */
 471 static int reiserfs_bmap(struct inode *inode, sector_t block,
 472                          struct buffer_head *bh_result, int create)
 473 {
 474         if (!file_capable(inode, block))
 475                 return -EFBIG;
 476
 477         reiserfs_write_lock(inode->i_sb);
 478         /* do not read the direct item */
 479         _get_block_create_0(inode, block, bh_result, 0);
 480         reiserfs_write_unlock(inode->i_sb);
 481         return 0;
 482 }
 483
 484 /*
 485  * special version of get_block that is only used by grab_tail_page right
 486  * now.  It is sent to __block_write_begin, and when you try to get a
 487  * block past the end of the file (or a block from a hole) it returns
 488  * -ENOENT instead of a valid buffer.  __block_write_begin expects to
 489  * be able to do i/o on the buffers returned, unless an error value
 490  * is also returned.
 491  *
 492  * So, this allows __block_write_begin to be used for reading a single block
 493  * in a page.  Where it does not produce a valid page for holes, or past the
 494  * end of the file.  This turns out to be exactly what we need for reading
 495  * tails for conversion.
 496  *
 497  * The point of the wrapper is forcing a certain value for create, even
 498  * though the VFS layer is calling this function with create==1.  If you
 499  * don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block,
 500  * don't use this function.
 501 */
 502 static int reiserfs_get_block_create_0(struct inode *inode, sector_t block,
 503                                        struct buffer_head *bh_result,
 504                                        int create)
 505 {
 506         return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE);
 507 }
 508
 509 /*
 510  * This is special helper for reiserfs_get_block in case we are executing
 511  * direct_IO request.
 512  */
 513 static int reiserfs_get_blocks_direct_io(struct inode *inode,
 514                                          sector_t iblock,
 515                                          struct buffer_head *bh_result,
 516                                          int create)
 517 {
 518         int ret;
 519
 520         bh_result->b_page = NULL;
 521
 522         /*
 523          * We set the b_size before reiserfs_get_block call since it is
 524          * referenced in convert_tail_for_hole() that may be called from
 525          * reiserfs_get_block()
 526          */
 527         bh_result->b_size = (1 << inode->i_blkbits);
 528
 529         ret = reiserfs_get_block(inode, iblock, bh_result,
 530                                  create | GET_BLOCK_NO_DANGLE);
 531         if (ret)
 532                 goto out;
 533
 534         /* don't allow direct io onto tail pages */
 535         if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
 536                 /*
 537                  * make sure future calls to the direct io funcs for this
 538                  * offset in the file fail by unmapping the buffer
 539                  */
 540                 clear_buffer_mapped(bh_result);
 541                 ret = -EINVAL;
 542         }
 543
 544         /*
 545          * Possible unpacked tail. Flush the data before pages have
 546          * disappeared
 547          */
 548         if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) {
 549                 int err;
 550
 551                 reiserfs_write_lock(inode->i_sb);
 552
 553                 err = reiserfs_commit_for_inode(inode);
 554                 REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
 555
 556                 reiserfs_write_unlock(inode->i_sb);
 557
 558                 if (err < 0)
 559                         ret = err;
 560         }
 561 out:
 562         return ret;
 563 }
 564
 565 /*
 566  * helper function for when reiserfs_get_block is called for a hole
 567  * but the file tail is still in a direct item
 568  * bh_result is the buffer head for the hole
 569  * tail_offset is the offset of the start of the tail in the file
 570  *
 571  * This calls prepare_write, which will start a new transaction
 572  * you should not be in a transaction, or have any paths held when you
 573  * call this.
 574  */
 575 static int convert_tail_for_hole(struct inode *inode,
 576                                  struct buffer_head *bh_result,
 577                                  loff_t tail_offset)
 578 {
 579         unsigned long index;
 580         unsigned long tail_end;
 581         unsigned long tail_start;
 582         struct page *tail_page;
 583         struct page *hole_page = bh_result->b_page;
 584         int retval = 0;
 585
 586         if ((tail_offset & (bh_result->b_size - 1)) != 1)
 587                 return -EIO;
 588
 589         /* always try to read until the end of the block */
 590         tail_start = tail_offset & (PAGE_CACHE_SIZE - 1);
 591         tail_end = (tail_start | (bh_result->b_size - 1)) + 1;
 592
 593         index = tail_offset >> PAGE_CACHE_SHIFT;
 594         /*
 595          * hole_page can be zero in case of direct_io, we are sure
 596          * that we cannot get here if we write with O_DIRECT into tail page
 597          */
 598         if (!hole_page || index != hole_page->index) {
 599                 tail_page = grab_cache_page(inode->i_mapping, index);
 600                 retval = -ENOMEM;
 601                 if (!tail_page) {
 602                         goto out;
 603                 }
 604         } else {
 605                 tail_page = hole_page;
 606         }
 607
 608         /*
 609          * we don't have to make sure the conversion did not happen while
 610          * we were locking the page because anyone that could convert
 611          * must first take i_mutex.
 612          *
 613          * We must fix the tail page for writing because it might have buffers
 614          * that are mapped, but have a block number of 0.  This indicates tail
 615          * data that has been read directly into the page, and
 616          * __block_write_begin won't trigger a get_block in this case.
 617          */
 618         fix_tail_page_for_writing(tail_page);
 619         retval = __reiserfs_write_begin(tail_page, tail_start,
 620                                       tail_end - tail_start);
 621         if (retval)
 622                 goto unlock;
 623
 624         /* tail conversion might change the data in the page */
 625         flush_dcache_page(tail_page);
 626
 627         retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end);
 628
 629 unlock:
 630         if (tail_page != hole_page) {
 631                 unlock_page(tail_page);
 632                 page_cache_release(tail_page);
 633         }
 634 out:
 635         return retval;
 636 }
 637
 638 static inline int _allocate_block(struct reiserfs_transaction_handle *th,
 639                                   sector_t block,
 640                                   struct inode *inode,
 641                                   b_blocknr_t * allocated_block_nr,
 642                                   struct treepath *path, int flags)
 643 {
 644         BUG_ON(!th->t_trans_id);
 645
 646 #ifdef REISERFS_PREALLOCATE
 647         if (!(flags & GET_BLOCK_NO_IMUX)) {
 648                 return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr,
 649                                                   path, block);
 650         }
 651 #endif
 652         return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path,
 653                                          block);
 654 }
 655
 656 int reiserfs_get_block(struct inode *inode, sector_t block,
 657                        struct buffer_head *bh_result, int create)
 658 {
 659         int repeat, retval = 0;
 660         /* b_blocknr_t is (unsigned) 32 bit int*/
 661         b_blocknr_t allocated_block_nr = 0;
 662         INITIALIZE_PATH(path);
 663         int pos_in_item;
 664         struct cpu_key key;
 665         struct buffer_head *bh, *unbh = NULL;
 666         struct item_head *ih, tmp_ih;
 667         __le32 *item;
 668         int done;
 669         int fs_gen;
 670         struct reiserfs_transaction_handle *th = NULL;
 671         /*
 672          * space reserved in transaction batch:
 673          * . 3 balancings in direct->indirect conversion
 674          * . 1 block involved into reiserfs_update_sd()
 675          * XXX in practically impossible worst case direct2indirect()
 676          * can incur (much) more than 3 balancings.
 677          * quota update for user, group
 678          */
 679         int jbegin_count =
 680             JOURNAL_PER_BALANCE_CNT * 3 + 1 +
 681             2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
 682         int version;
 683         int dangle = 1;
 684         loff_t new_offset =
 685             (((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;
 686
 687         reiserfs_write_lock(inode->i_sb);
 688         version = get_inode_item_key_version(inode);
 689
 690         if (!file_capable(inode, block)) {
 691                 reiserfs_write_unlock(inode->i_sb);
 692                 return -EFBIG;
 693         }
 694
 695         /*
 696          * if !create, we aren't changing the FS, so we don't need to
 697          * log anything, so we don't need to start a transaction
 698          */
 699         if (!(create & GET_BLOCK_CREATE)) {
 700                 int ret;
 701                 /* find number of block-th logical block of the file */
 702                 ret = _get_block_create_0(inode, block, bh_result,
 703                                           create | GET_BLOCK_READ_DIRECT);
 704                 reiserfs_write_unlock(inode->i_sb);
 705                 return ret;
 706         }
 707
 708         /*
 709          * if we're already in a transaction, make sure to close
 710          * any new transactions we start in this func
 711          */
 712         if ((create & GET_BLOCK_NO_DANGLE) ||
 713             reiserfs_transaction_running(inode->i_sb))
 714                 dangle = 0;
 715
 716         /*
 717          * If file is of such a size, that it might have a tail and
 718          * tails are enabled  we should mark it as possibly needing
 719          * tail packing on close
 720          */
 721         if ((have_large_tails(inode->i_sb)
 722              && inode->i_size < i_block_size(inode) * 4)
 723             || (have_small_tails(inode->i_sb)
 724                 && inode->i_size < i_block_size(inode)))
 725                 REISERFS_I(inode)->i_flags |= i_pack_on_close_mask;
 726
 727         /* set the key of the first byte in the 'block'-th block of file */
 728         make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ );
 729         if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) {
 730 start_trans:
 731                 th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count);
 732                 if (!th) {
 733                         retval = -ENOMEM;
 734                         goto failure;
 735                 }
 736                 reiserfs_update_inode_transaction(inode);
 737         }
 738 research:
 739
 740         retval = search_for_position_by_key(inode->i_sb, &key, &path);
 741         if (retval == IO_ERROR) {
 742                 retval = -EIO;
 743                 goto failure;
 744         }
 745
 746         bh = get_last_bh(&path);
 747         ih = tp_item_head(&path);
 748         item = tp_item_body(&path);
 749         pos_in_item = path.pos_in_item;
 750
 751         fs_gen = get_generation(inode->i_sb);
 752         copy_item_head(&tmp_ih, ih);
 753
 754         if (allocation_needed
 755             (retval, allocated_block_nr, ih, item, pos_in_item)) {
 756                 /* we have to allocate block for the unformatted node */
 757                 if (!th) {
 758                         pathrelse(&path);
 759                         goto start_trans;
 760                 }
 761
 762                 repeat =
 763                     _allocate_block(th, block, inode, &allocated_block_nr,
 764                                     &path, create);
 765
 766                 /*
 767                  * restart the transaction to give the journal a chance to free
 768                  * some blocks.  releases the path, so we have to go back to
 769                  * research if we succeed on the second try
 770                  */
 771                 if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) {
 772                         SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1;
 773                         retval = restart_transaction(th, inode, &path);
 774                         if (retval)
 775                                 goto failure;
 776                         repeat =
 777                             _allocate_block(th, block, inode,
 778                                             &allocated_block_nr, NULL, create);
 779
 780                         if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) {
 781                                 goto research;
 782                         }
 783                         if (repeat == QUOTA_EXCEEDED)
 784                                 retval = -EDQUOT;
 785                         else
 786                                 retval = -ENOSPC;
 787                         goto failure;
 788                 }
 789
 790                 if (fs_changed(fs_gen, inode->i_sb)
 791                     && item_moved(&tmp_ih, &path)) {
 792                         goto research;
 793                 }
 794         }
 795
 796         if (indirect_item_found(retval, ih)) {
 797                 b_blocknr_t unfm_ptr;
 798                 /*
 799                  * 'block'-th block is in the file already (there is
 800                  * corresponding cell in some indirect item). But it may be
 801                  * zero unformatted node pointer (hole)
 802                  */
 803                 unfm_ptr = get_block_num(item, pos_in_item);
 804                 if (unfm_ptr == 0) {
 805                         /* use allocated block to plug the hole */
 806                         reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
 807                         if (fs_changed(fs_gen, inode->i_sb)
 808                             && item_moved(&tmp_ih, &path)) {
 809                                 reiserfs_restore_prepared_buffer(inode->i_sb,
 810                                                                  bh);
 811                                 goto research;
 812                         }
 813                         set_buffer_new(bh_result);
 814                         if (buffer_dirty(bh_result)
 815                             && reiserfs_data_ordered(inode->i_sb))
 816                                 reiserfs_add_ordered_list(inode, bh_result);
 817                         put_block_num(item, pos_in_item, allocated_block_nr);
 818                         unfm_ptr = allocated_block_nr;
 819                         journal_mark_dirty(th, bh);
 820                         reiserfs_update_sd(th, inode);
 821                 }
 822                 set_block_dev_mapped(bh_result, unfm_ptr, inode);
 823                 pathrelse(&path);
 824                 retval = 0;
 825                 if (!dangle && th)
 826                         retval = reiserfs_end_persistent_transaction(th);
 827
 828                 reiserfs_write_unlock(inode->i_sb);
 829
 830                 /*
 831                  * the item was found, so new blocks were not added to the file
 832                  * there is no need to make sure the inode is updated with this
 833                  * transaction
 834                  */
 835                 return retval;
 836         }
 837
 838         if (!th) {
 839                 pathrelse(&path);
 840                 goto start_trans;
 841         }
 842
 843         /*
 844          * desired position is not found or is in the direct item. We have
 845          * to append file with holes up to 'block'-th block converting
 846          * direct items to indirect one if necessary
 847          */
 848         done = 0;
 849         do {
 850                 if (is_statdata_le_ih(ih)) {
 851                         __le32 unp = 0;
 852                         struct cpu_key tmp_key;
 853
 854                         /* indirect item has to be inserted */
 855                         make_le_item_head(&tmp_ih, &key, version, 1,
 856                                           TYPE_INDIRECT, UNFM_P_SIZE,
 857                                           0 /* free_space */ );
 858
 859                         /*
 860                          * we are going to add 'block'-th block to the file.
 861                          * Use allocated block for that
 862                          */
 863                         if (cpu_key_k_offset(&key) == 1) {
 864                                 unp = cpu_to_le32(allocated_block_nr);
 865                                 set_block_dev_mapped(bh_result,
 866                                                      allocated_block_nr, inode);
 867                                 set_buffer_new(bh_result);
 868                                 done = 1;
 869                         }
 870                         tmp_key = key;  /* ;) */
 871                         set_cpu_key_k_offset(&tmp_key, 1);
 872                         PATH_LAST_POSITION(&path)++;
 873
 874                         retval =
 875                             reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih,
 876                                                  inode, (char *)&unp);
 877                         if (retval) {
 878                                 reiserfs_free_block(th, inode,
 879                                                     allocated_block_nr, 1);
 880                                 /*
 881                                  * retval == -ENOSPC, -EDQUOT or -EIO
 882                                  * or -EEXIST
 883                                  */
 884                                 goto failure;
 885                         }
 886                 } else if (is_direct_le_ih(ih)) {
 887                         /* direct item has to be converted */
 888                         loff_t tail_offset;
 889
 890                         tail_offset =
 891                             ((le_ih_k_offset(ih) -
 892                               1) & ~(inode->i_sb->s_blocksize - 1)) + 1;
 893
 894                         /*
 895                          * direct item we just found fits into block we have
 896                          * to map. Convert it into unformatted node: use
 897                          * bh_result for the conversion
 898                          */
 899                         if (tail_offset == cpu_key_k_offset(&key)) {
 900                                 set_block_dev_mapped(bh_result,
 901                                                      allocated_block_nr, inode);
 902                                 unbh = bh_result;
 903                                 done = 1;
 904                         } else {
 905                                 /*
 906                                  * we have to pad file tail stored in direct
 907                                  * item(s) up to block size and convert it
 908                                  * to unformatted node. FIXME: this should
 909                                  * also get into page cache
 910                                  */
 911
 912                                 pathrelse(&path);
 913                                 /*
 914                                  * ugly, but we can only end the transaction if
 915                                  * we aren't nested
 916                                  */
 917                                 BUG_ON(!th->t_refcount);
 918                                 if (th->t_refcount == 1) {
 919                                         retval =
 920                                             reiserfs_end_persistent_transaction
 921                                             (th);
 922                                         th = NULL;
 923                                         if (retval)
 924                                                 goto failure;
 925                                 }
 926
 927                                 retval =
 928                                     convert_tail_for_hole(inode, bh_result,
 929                                                           tail_offset);
 930                                 if (retval) {
 931                                         if (retval != -ENOSPC)
 932                                                 reiserfs_error(inode->i_sb,
 933                                                         "clm-6004",
 934                                                         "convert tail failed "
 935                                                         "inode %lu, error %d",
 936                                                         inode->i_ino,
 937                                                         retval);
 938                                         if (allocated_block_nr) {
 939                                                 /*
 940                                                  * the bitmap, the super,
 941                                                  * and the stat data == 3
 942                                                  */
 943                                                 if (!th)
 944                                                         th = reiserfs_persistent_transaction(inode->i_sb, 3);
 945                                                 if (th)
 946                                                         reiserfs_free_block(th,
 947                                                                             inode,
 948                                                                             allocated_block_nr,
 949                                                                             1);
 950                                         }
 951                                         goto failure;
 952                                 }
 953                                 goto research;
 954                         }
 955                         retval =
 956                             direct2indirect(th, inode, &path, unbh,
 957                                             tail_offset);
 958                         if (retval) {
 959                                 reiserfs_unmap_buffer(unbh);
 960                                 reiserfs_free_block(th, inode,
 961                                                     allocated_block_nr, 1);
 962                                 goto failure;
 963                         }
 964                         /*
 965                          * it is important the set_buffer_uptodate is done
 966                          * after the direct2indirect.  The buffer might
 967                          * contain valid data newer than the data on disk
 968                          * (read by readpage, changed, and then sent here by
 969                          * writepage).  direct2indirect needs to know if unbh
 970                          * was already up to date, so it can decide if the
 971                          * data in unbh needs to be replaced with data from
 972                          * the disk
 973                          */
 974                         set_buffer_uptodate(unbh);
 975
 976                         /*
 977                          * unbh->b_page == NULL in case of DIRECT_IO request,
 978                          * this means buffer will disappear shortly, so it
 979                          * should not be added to
 980                          */
 981                         if (unbh->b_page) {
 982                                 /*
 983                                  * we've converted the tail, so we must
 984                                  * flush unbh before the transaction commits
 985                                  */
 986                                 reiserfs_add_tail_list(inode, unbh);
 987
 988                                 /*
 989                                  * mark it dirty now to prevent commit_write
 990                                  * from adding this buffer to the inode's
 991                                  * dirty buffer list
 992                                  */
 993                                 /*
 994                                  * AKPM: changed __mark_buffer_dirty to
 995                                  * mark_buffer_dirty().  It's still atomic,
 996                                  * but it sets the page dirty too, which makes
 997                                  * it eligible for writeback at any time by the
 998                                  * VM (which was also the case with
 999                                  * __mark_buffer_dirty())
1000                                  */
1001                                 mark_buffer_dirty(unbh);
1002                         }
1003                 } else {
1004                         /*
1005                          * append indirect item with holes if needed, when
1006                          * appending pointer to 'block'-th block use block,
1007                          * which is already allocated
1008                          */
1009                         struct cpu_key tmp_key;
1010                         /*
1011                          * We use this in case we need to allocate
1012                          * only one block which is a fastpath
1013                          */
1014                         unp_t unf_single = 0;
1015                         unp_t *un;
1016                         __u64 max_to_insert =
1017                             MAX_ITEM_LEN(inode->i_sb->s_blocksize) /
1018                             UNFM_P_SIZE;
1019                         __u64 blocks_needed;
1020
1021                         RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE,
1022                                "vs-804: invalid position for append");
1023                         /*
1024                          * indirect item has to be appended,
1025                          * set up key of that position
1026                          * (key type is unimportant)
1027                          */
1028                         make_cpu_key(&tmp_key, inode,
1029                                      le_key_k_offset(version,
1030                                                      &ih->ih_key) +
1031                                      op_bytes_number(ih,
1032                                                      inode->i_sb->s_blocksize),
1033                                      TYPE_INDIRECT, 3);
1034
1035                         RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key),
1036                                "green-805: invalid offset");
1037                         blocks_needed =
1038                             1 +
1039                             ((cpu_key_k_offset(&key) -
1040                               cpu_key_k_offset(&tmp_key)) >> inode->i_sb->
1041                              s_blocksize_bits);
1042
1043                         if (blocks_needed == 1) {
1044                                 un = &unf_single;
1045                         } else {
1046                                 un = kzalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_NOFS);
1047                                 if (!un) {
1048                                         un = &unf_single;
1049                                         blocks_needed = 1;
1050                                         max_to_insert = 0;
1051                                 }
1052                         }
1053                         if (blocks_needed <= max_to_insert) {
1054                                 /*
1055                                  * we are going to add target block to
1056                                  * the file. Use allocated block for that
1057                                  */
1058                                 un[blocks_needed - 1] =
1059                                     cpu_to_le32(allocated_block_nr);
1060                                 set_block_dev_mapped(bh_result,
1061                                                      allocated_block_nr, inode);
1062                                 set_buffer_new(bh_result);
1063                                 done = 1;
1064                         } else {
1065                                 /* paste hole to the indirect item */
1066                                 /*
1067                                  * If kmalloc failed, max_to_insert becomes
1068                                  * zero and it means we only have space for
1069                                  * one block
1070                                  */
1071                                 blocks_needed =
1072                                     max_to_insert ? max_to_insert : 1;
1073                         }
1074                         retval =
1075                             reiserfs_paste_into_item(th, &path, &tmp_key, inode,
1076                                                      (char *)un,
1077                                                      UNFM_P_SIZE *
1078                                                      blocks_needed);
1079
1080                         if (blocks_needed != 1)
1081                                 kfree(un);
1082
1083                         if (retval) {
1084                                 reiserfs_free_block(th, inode,
1085                                                     allocated_block_nr, 1);
1086                                 goto failure;
1087                         }
1088                         if (!done) {
1089                                 /*
1090                                  * We need to mark new file size in case
1091                                  * this function will be interrupted/aborted
1092                                  * later on. And we may do this only for
1093                                  * holes.
1094                                  */
1095                                 inode->i_size +=
1096                                     inode->i_sb->s_blocksize * blocks_needed;
1097                         }
1098                 }
1099
1100                 if (done == 1)
1101                         break;
1102
1103                 /*
1104                  * this loop could log more blocks than we had originally
1105                  * asked for.  So, we have to allow the transaction to end
1106                  * if it is too big or too full.  Update the inode so things
1107                  * are consistent if we crash before the function returns
1108                  * release the path so that anybody waiting on the path before
1109                  * ending their transaction will be able to continue.
1110                  */
1111                 if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
1112                         retval = restart_transaction(th, inode, &path);
1113                         if (retval)
1114                                 goto failure;
1115                 }
1116                 /*
1117                  * inserting indirect pointers for a hole can take a
1118                  * long time.  reschedule if needed and also release the write
1119                  * lock for others.
1120                  */
1121                 reiserfs_cond_resched(inode->i_sb);
1122
1123                 retval = search_for_position_by_key(inode->i_sb, &key, &path);
1124                 if (retval == IO_ERROR) {
1125                         retval = -EIO;
1126                         goto failure;
1127                 }
1128                 if (retval == POSITION_FOUND) {
1129                         reiserfs_warning(inode->i_sb, "vs-825",
1130                                          "%K should not be found", &key);
1131                         retval = -EEXIST;
1132                         if (allocated_block_nr)
1133                                 reiserfs_free_block(th, inode,
1134                                                     allocated_block_nr, 1);
1135                         pathrelse(&path);
1136                         goto failure;
1137                 }
1138                 bh = get_last_bh(&path);
1139                 ih = tp_item_head(&path);
1140                 item = tp_item_body(&path);
1141                 pos_in_item = path.pos_in_item;
1142         } while (1);
1143
1144         retval = 0;
1145
1146 failure:
1147         if (th && (!dangle || (retval && !th->t_trans_id))) {
1148                 int err;
1149                 if (th->t_trans_id)
1150                         reiserfs_update_sd(th, inode);
1151                 err = reiserfs_end_persistent_transaction(th);
1152                 if (err)
1153                         retval = err;
1154         }
1155
1156         reiserfs_write_unlock(inode->i_sb);
1157         reiserfs_check_path(&path);
1158         return retval;
1159 }
1160
1161 static int
1162 reiserfs_readpages(struct file *file, struct address_space *mapping,
1163                    struct list_head *pages, unsigned nr_pages)
1164 {
1165         return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
1166 }
1167
1168 /*
1169  * Compute real number of used bytes by file
1170  * Following three functions can go away when we'll have enough space in
1171  * stat item
1172  */
1173 static int real_space_diff(struct inode *inode, int sd_size)
1174 {
1175         int bytes;
1176         loff_t blocksize = inode->i_sb->s_blocksize;
1177
1178         if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
1179                 return sd_size;
1180
1181         /*
1182          * End of file is also in full block with indirect reference, so round
1183          * up to the next block.
1184          *
1185          * there is just no way to know if the tail is actually packed
1186          * on the file, so we have to assume it isn't.  When we pack the
1187          * tail, we add 4 bytes to pretend there really is an unformatted
1188          * node pointer
1189          */
1190         bytes =
1191             ((inode->i_size +
1192               (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE +
1193             sd_size;
1194         return bytes;
1195 }
1196
1197 static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
1198                                         int sd_size)
1199 {
1200         if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1201                 return inode->i_size +
1202                     (loff_t) (real_space_diff(inode, sd_size));
1203         }
1204         return ((loff_t) real_space_diff(inode, sd_size)) +
1205             (((loff_t) blocks) << 9);
1206 }
1207
1208 /* Compute number of blocks used by file in ReiserFS counting */
1209 static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
1210 {
1211         loff_t bytes = inode_get_bytes(inode);
1212         loff_t real_space = real_space_diff(inode, sd_size);
1213
1214         /* keeps fsck and non-quota versions of reiserfs happy */
1215         if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1216                 bytes += (loff_t) 511;
1217         }
1218
1219         /*
1220          * files from before the quota patch might i_blocks such that
1221          * bytes < real_space.  Deal with that here to prevent it from
1222          * going negative.
1223          */
1224         if (bytes < real_space)
1225                 return 0;
1226         return (bytes - real_space) >> 9;
1227 }
1228
1229 /*
1230  * BAD: new directories have stat data of new type and all other items
1231  * of old type. Version stored in the inode says about body items, so
1232  * in update_stat_data we can not rely on inode, but have to check
1233  * item version directly
1234  */
1235
1236 /* called by read_locked_inode */
1237 static void init_inode(struct inode *inode, struct treepath *path)
1238 {
1239         struct buffer_head *bh;
1240         struct item_head *ih;
1241         __u32 rdev;
1242
1243         bh = PATH_PLAST_BUFFER(path);
1244         ih = tp_item_head(path);
1245
1246         copy_key(INODE_PKEY(inode), &ih->ih_key);
1247
1248         INIT_LIST_HEAD(&REISERFS_I(inode)->i_prealloc_list);
1249         REISERFS_I(inode)->i_flags = 0;
1250         REISERFS_I(inode)->i_prealloc_block = 0;
1251         REISERFS_I(inode)->i_prealloc_count = 0;
1252         REISERFS_I(inode)->i_trans_id = 0;
1253         REISERFS_I(inode)->i_jl = NULL;
1254         reiserfs_init_xattr_rwsem(inode);
1255
1256         if (stat_data_v1(ih)) {
1257                 struct stat_data_v1 *sd =
1258                     (struct stat_data_v1 *)ih_item_body(bh, ih);
1259                 unsigned long blocks;
1260
1261                 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1262                 set_inode_sd_version(inode, STAT_DATA_V1);
1263                 inode->i_mode = sd_v1_mode(sd);
1264                 set_nlink(inode, sd_v1_nlink(sd));
1265                 i_uid_write(inode, sd_v1_uid(sd));
1266                 i_gid_write(inode, sd_v1_gid(sd));
1267                 inode->i_size = sd_v1_size(sd);
1268                 inode->i_atime.tv_sec = sd_v1_atime(sd);
1269                 inode->i_mtime.tv_sec = sd_v1_mtime(sd);
1270                 inode->i_ctime.tv_sec = sd_v1_ctime(sd);
1271                 inode->i_atime.tv_nsec = 0;
1272                 inode->i_ctime.tv_nsec = 0;
1273                 inode->i_mtime.tv_nsec = 0;
1274
1275                 inode->i_blocks = sd_v1_blocks(sd);
1276                 inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1277                 blocks = (inode->i_size + 511) >> 9;
1278                 blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
1279
1280                 /*
1281                  * there was a bug in <=3.5.23 when i_blocks could take
1282                  * negative values. Starting from 3.5.17 this value could
1283                  * even be stored in stat data. For such files we set
1284                  * i_blocks based on file size. Just 2 notes: this can be
1285                  * wrong for sparse files. On-disk value will be only
1286                  * updated if file's inode will ever change
1287                  */
1288                 if (inode->i_blocks > blocks) {
1289                         inode->i_blocks = blocks;
1290                 }
1291
1292                 rdev = sd_v1_rdev(sd);
1293                 REISERFS_I(inode)->i_first_direct_byte =
1294                     sd_v1_first_direct_byte(sd);
1295
1296                 /*
1297                  * an early bug in the quota code can give us an odd
1298                  * number for the block count.  This is incorrect, fix it here.
1299                  */
1300                 if (inode->i_blocks & 1) {
1301                         inode->i_blocks++;
1302                 }
1303                 inode_set_bytes(inode,
1304                                 to_real_used_space(inode, inode->i_blocks,
1305                                                    SD_V1_SIZE));
1306                 /*
1307                  * nopack is initially zero for v1 objects. For v2 objects,
1308                  * nopack is initialised from sd_attrs
1309                  */
1310                 REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
1311         } else {
1312                 /*
1313                  * new stat data found, but object may have old items
1314                  * (directories and symlinks)
1315                  */
1316                 struct stat_data *sd = (struct stat_data *)ih_item_body(bh, ih);
1317
1318                 inode->i_mode = sd_v2_mode(sd);
1319                 set_nlink(inode, sd_v2_nlink(sd));
1320                 i_uid_write(inode, sd_v2_uid(sd));
1321                 inode->i_size = sd_v2_size(sd);
1322                 i_gid_write(inode, sd_v2_gid(sd));
1323                 inode->i_mtime.tv_sec = sd_v2_mtime(sd);
1324                 inode->i_atime.tv_sec = sd_v2_atime(sd);
1325                 inode->i_ctime.tv_sec = sd_v2_ctime(sd);
1326                 inode->i_ctime.tv_nsec = 0;
1327                 inode->i_mtime.tv_nsec = 0;
1328                 inode->i_atime.tv_nsec = 0;
1329                 inode->i_blocks = sd_v2_blocks(sd);
1330                 rdev = sd_v2_rdev(sd);
1331                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1332                         inode->i_generation =
1333                             le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1334                 else
1335                         inode->i_generation = sd_v2_generation(sd);
1336
1337                 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1338                         set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1339                 else
1340                         set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1341                 REISERFS_I(inode)->i_first_direct_byte = 0;
1342                 set_inode_sd_version(inode, STAT_DATA_V2);
1343                 inode_set_bytes(inode,
1344                                 to_real_used_space(inode, inode->i_blocks,
1345                                                    SD_V2_SIZE));
1346                 /*
1347                  * read persistent inode attributes from sd and initialise
1348                  * generic inode flags from them
1349                  */
1350                 REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
1351                 sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
1352         }
1353
1354         pathrelse(path);
1355         if (S_ISREG(inode->i_mode)) {
1356                 inode->i_op = &reiserfs_file_inode_operations;
1357                 inode->i_fop = &reiserfs_file_operations;
1358                 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1359         } else if (S_ISDIR(inode->i_mode)) {
1360                 inode->i_op = &reiserfs_dir_inode_operations;
1361                 inode->i_fop = &reiserfs_dir_operations;
1362         } else if (S_ISLNK(inode->i_mode)) {
1363                 inode->i_op = &reiserfs_symlink_inode_operations;
1364                 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1365         } else {
1366                 inode->i_blocks = 0;
1367                 inode->i_op = &reiserfs_special_inode_operations;
1368                 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
1369         }
1370 }
1371
1372 /* update new stat data with inode fields */
1373 static void inode2sd(void *sd, struct inode *inode, loff_t size)
1374 {
1375         struct stat_data *sd_v2 = (struct stat_data *)sd;
1376         __u16 flags;
1377
1378         set_sd_v2_mode(sd_v2, inode->i_mode);
1379         set_sd_v2_nlink(sd_v2, inode->i_nlink);
1380         set_sd_v2_uid(sd_v2, i_uid_read(inode));
1381         set_sd_v2_size(sd_v2, size);
1382         set_sd_v2_gid(sd_v2, i_gid_read(inode));
1383         set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec);
1384         set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec);
1385         set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec);
1386         set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE));
1387         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1388                 set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev));
1389         else
1390                 set_sd_v2_generation(sd_v2, inode->i_generation);
1391         flags = REISERFS_I(inode)->i_attrs;
1392         i_attrs_to_sd_attrs(inode, &flags);
1393         set_sd_v2_attrs(sd_v2, flags);
1394 }
1395
1396 /* used to copy inode's fields to old stat data */
1397 static void inode2sd_v1(void *sd, struct inode *inode, loff_t size)
1398 {
1399         struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd;
1400
1401         set_sd_v1_mode(sd_v1, inode->i_mode);
1402         set_sd_v1_uid(sd_v1, i_uid_read(inode));
1403         set_sd_v1_gid(sd_v1, i_gid_read(inode));
1404         set_sd_v1_nlink(sd_v1, inode->i_nlink);
1405         set_sd_v1_size(sd_v1, size);
1406         set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec);
1407         set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec);
1408         set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec);
1409
1410         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1411                 set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
1412         else
1413                 set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
1414
1415         /* Sigh. i_first_direct_byte is back */
1416         set_sd_v1_first_direct_byte(sd_v1,
1417                                     REISERFS_I(inode)->i_first_direct_byte);
1418 }
1419
1420 /*
1421  * NOTE, you must prepare the buffer head before sending it here,
1422  * and then log it after the call
1423  */
1424 static void update_stat_data(struct treepath *path, struct inode *inode,
1425                              loff_t size)
1426 {
1427         struct buffer_head *bh;
1428         struct item_head *ih;
1429
1430         bh = PATH_PLAST_BUFFER(path);
1431         ih = tp_item_head(path);
1432
1433         if (!is_statdata_le_ih(ih))
1434                 reiserfs_panic(inode->i_sb, "vs-13065", "key %k, found item %h",
1435                                INODE_PKEY(inode), ih);
1436
1437         /* path points to old stat data */
1438         if (stat_data_v1(ih)) {
1439                 inode2sd_v1(ih_item_body(bh, ih), inode, size);
1440         } else {
1441                 inode2sd(ih_item_body(bh, ih), inode, size);
1442         }
1443
1444         return;
1445 }
1446
1447 void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
1448                              struct inode *inode, loff_t size)
1449 {
1450         struct cpu_key key;
1451         INITIALIZE_PATH(path);
1452         struct buffer_head *bh;
1453         int fs_gen;
1454         struct item_head *ih, tmp_ih;
1455         int retval;
1456
1457         BUG_ON(!th->t_trans_id);
1458
1459         /* key type is unimportant */
1460         make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3);
1461
1462         for (;;) {
1463                 int pos;
1464                 /* look for the object's stat data */
1465                 retval = search_item(inode->i_sb, &key, &path);
1466                 if (retval == IO_ERROR) {
1467                         reiserfs_error(inode->i_sb, "vs-13050",
1468                                        "i/o failure occurred trying to "
1469                                        "update %K stat data", &key);
1470                         return;
1471                 }
1472                 if (retval == ITEM_NOT_FOUND) {
1473                         pos = PATH_LAST_POSITION(&path);
1474                         pathrelse(&path);
1475                         if (inode->i_nlink == 0) {
1476                                 /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */
1477                                 return;
1478                         }
1479                         reiserfs_warning(inode->i_sb, "vs-13060",
1480                                          "stat data of object %k (nlink == %d) "
1481                                          "not found (pos %d)",
1482                                          INODE_PKEY(inode), inode->i_nlink,
1483                                          pos);
1484                         reiserfs_check_path(&path);
1485                         return;
1486                 }
1487
1488                 /*
1489                  * sigh, prepare_for_journal might schedule.  When it
1490                  * schedules the FS might change.  We have to detect that,
1491                  * and loop back to the search if the stat data item has moved
1492                  */
1493                 bh = get_last_bh(&path);
1494                 ih = tp_item_head(&path);
1495                 copy_item_head(&tmp_ih, ih);
1496                 fs_gen = get_generation(inode->i_sb);
1497                 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
1498
1499                 /* Stat_data item has been moved after scheduling. */
1500                 if (fs_changed(fs_gen, inode->i_sb)
1501                     && item_moved(&tmp_ih, &path)) {
1502                         reiserfs_restore_prepared_buffer(inode->i_sb, bh);
1503                         continue;
1504                 }
1505                 break;
1506         }
1507         update_stat_data(&path, inode, size);
1508         journal_mark_dirty(th, bh);
1509         pathrelse(&path);
1510         return;
1511 }
1512
1513 /*
1514  * reiserfs_read_locked_inode is called to read the inode off disk, and it
1515  * does a make_bad_inode when things go wrong.  But, we need to make sure
1516  * and clear the key in the private portion of the inode, otherwise a
1517  * corresponding iput might try to delete whatever object the inode last
1518  * represented.
1519  */
1520 static void reiserfs_make_bad_inode(struct inode *inode)
1521 {
1522         memset(INODE_PKEY(inode), 0, KEY_SIZE);
1523         make_bad_inode(inode);
1524 }
1525
1526 /*
1527  * initially this function was derived from minix or ext2's analog and
1528  * evolved as the prototype did
1529  */
1530 int reiserfs_init_locked_inode(struct inode *inode, void *p)
1531 {
1532         struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p;
1533         inode->i_ino = args->objectid;
1534         INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
1535         return 0;
1536 }
1537
1538 /*
1539  * looks for stat data in the tree, and fills up the fields of in-core
1540  * inode stat data fields
1541  */
1542 void reiserfs_read_locked_inode(struct inode *inode,
1543                                 struct reiserfs_iget_args *args)
1544 {
1545         INITIALIZE_PATH(path_to_sd);
1546         struct cpu_key key;
1547         unsigned long dirino;
1548         int retval;
1549
1550         dirino = args->dirid;
1551
1552         /*
1553          * set version 1, version 2 could be used too, because stat data
1554          * key is the same in both versions
1555          */
1556         key.version = KEY_FORMAT_3_5;
1557         key.on_disk_key.k_dir_id = dirino;
1558         key.on_disk_key.k_objectid = inode->i_ino;
1559         key.on_disk_key.k_offset = 0;
1560         key.on_disk_key.k_type = 0;
1561
1562         /* look for the object's stat data */
1563         retval = search_item(inode->i_sb, &key, &path_to_sd);
1564         if (retval == IO_ERROR) {
1565                 reiserfs_error(inode->i_sb, "vs-13070",
1566                                "i/o failure occurred trying to find "
1567                                "stat data of %K", &key);
1568                 reiserfs_make_bad_inode(inode);
1569                 return;
1570         }
1571
1572         /* a stale NFS handle can trigger this without it being an error */
1573         if (retval != ITEM_FOUND) {
1574                 pathrelse(&path_to_sd);
1575                 reiserfs_make_bad_inode(inode);
1576                 clear_nlink(inode);
1577                 return;
1578         }
1579
1580         init_inode(inode, &path_to_sd);
1581
1582         /*
1583          * It is possible that knfsd is trying to access inode of a file
1584          * that is being removed from the disk by some other thread. As we
1585          * update sd on unlink all that is required is to check for nlink
1586          * here. This bug was first found by Sizif when debugging
1587          * SquidNG/Butterfly, forgotten, and found again after Philippe
1588          * Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
1589
1590          * More logical fix would require changes in fs/inode.c:iput() to
1591          * remove inode from hash-table _after_ fs cleaned disk stuff up and
1592          * in iget() to return NULL if I_FREEING inode is found in
1593          * hash-table.
1594          */
1595
1596         /*
1597          * Currently there is one place where it's ok to meet inode with
1598          * nlink==0: processing of open-unlinked and half-truncated files
1599          * during mount (fs/reiserfs/super.c:finish_unfinished()).
1600          */
1601         if ((inode->i_nlink == 0) &&
1602             !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
1603                 reiserfs_warning(inode->i_sb, "vs-13075",
1604                                  "dead inode read from disk %K. "
1605                                  "This is likely to be race with knfsd. Ignore",
1606                                  &key);
1607                 reiserfs_make_bad_inode(inode);
1608         }
1609
1610         /* init inode should be relsing */
1611         reiserfs_check_path(&path_to_sd);
1612
1613         /*
1614          * Stat data v1 doesn't support ACLs.
1615          */
1616         if (get_inode_sd_version(inode) == STAT_DATA_V1)
1617                 cache_no_acl(inode);
1618 }
1619
1620 /*
1621  * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
1622  *
1623  * @inode:    inode from hash table to check
1624  * @opaque:   "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
1625  *
1626  * This function is called by iget5_locked() to distinguish reiserfs inodes
1627  * having the same inode numbers. Such inodes can only exist due to some
1628  * error condition. One of them should be bad. Inodes with identical
1629  * inode numbers (objectids) are distinguished by parent directory ids.
1630  *
1631  */
1632 int reiserfs_find_actor(struct inode *inode, void *opaque)
1633 {
1634         struct reiserfs_iget_args *args;
1635
1636         args = opaque;
1637         /* args is already in CPU order */
1638         return (inode->i_ino == args->objectid) &&
1639             (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
1640 }
1641
1642 struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
1643 {
1644         struct inode *inode;
1645         struct reiserfs_iget_args args;
1646         int depth;
1647
1648         args.objectid = key->on_disk_key.k_objectid;
1649         args.dirid = key->on_disk_key.k_dir_id;
1650         depth = reiserfs_write_unlock_nested(s);
1651         inode = iget5_locked(s, key->on_disk_key.k_objectid,
1652                              reiserfs_find_actor, reiserfs_init_locked_inode,
1653                              (void *)(&args));
1654         reiserfs_write_lock_nested(s, depth);
1655         if (!inode)
1656                 return ERR_PTR(-ENOMEM);
1657
1658         if (inode->i_state & I_NEW) {
1659                 reiserfs_read_locked_inode(inode, &args);
1660                 unlock_new_inode(inode);
1661         }
1662
1663         if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
1664                 /* either due to i/o error or a stale NFS handle */
1665                 iput(inode);
1666                 inode = NULL;
1667         }
1668         return inode;
1669 }
1670
1671 static struct dentry *reiserfs_get_dentry(struct super_block *sb,
1672         u32 objectid, u32 dir_id, u32 generation)
1673
1674 {
1675         struct cpu_key key;
1676         struct inode *inode;
1677
1678         key.on_disk_key.k_objectid = objectid;
1679         key.on_disk_key.k_dir_id = dir_id;
1680         reiserfs_write_lock(sb);
1681         inode = reiserfs_iget(sb, &key);
1682         if (inode && !IS_ERR(inode) && generation != 0 &&
1683             generation != inode->i_generation) {
1684                 iput(inode);
1685                 inode = NULL;
1686         }
1687         reiserfs_write_unlock(sb);
1688
1689         return d_obtain_alias(inode);
1690 }
1691
1692 struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1693                 int fh_len, int fh_type)
1694 {
1695         /*
1696          * fhtype happens to reflect the number of u32s encoded.
1697          * due to a bug in earlier code, fhtype might indicate there
1698          * are more u32s then actually fitted.
1699          * so if fhtype seems to be more than len, reduce fhtype.
1700          * Valid types are:
1701          *   2 - objectid + dir_id - legacy support
1702          *   3 - objectid + dir_id + generation
1703          *   4 - objectid + dir_id + objectid and dirid of parent - legacy
1704          *   5 - objectid + dir_id + generation + objectid and dirid of parent
1705          *   6 - as above plus generation of directory
1706          * 6 does not fit in NFSv2 handles
1707          */
1708         if (fh_type > fh_len) {
1709                 if (fh_type != 6 || fh_len != 5)
1710                         reiserfs_warning(sb, "reiserfs-13077",
1711                                 "nfsd/reiserfs, fhtype=%d, len=%d - odd",
1712                                 fh_type, fh_len);
1713                 fh_type = fh_len;
1714         }
1715         if (fh_len < 2)
1716                 return NULL;
1717
1718         return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
1719                 (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
1720 }
1721
1722 struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1723                 int fh_len, int fh_type)
1724 {
1725         if (fh_type > fh_len)
1726                 fh_type = fh_len;
1727         if (fh_type < 4)
1728                 return NULL;
1729
1730         return reiserfs_get_dentry(sb,
1731                 (fh_type >= 5) ? fid->raw[3] : fid->raw[2],
1732                 (fh_type >= 5) ? fid->raw[4] : fid->raw[3],
1733                 (fh_type == 6) ? fid->raw[5] : 0);
1734 }
1735
1736 int reiserfs_encode_fh(struct inode *inode, __u32 * data, int *lenp,
1737                        struct inode *parent)
1738 {
1739         int maxlen = *lenp;
1740
1741         if (parent && (maxlen < 5)) {
1742                 *lenp = 5;
1743                 return FILEID_INVALID;
1744         } else if (maxlen < 3) {
1745                 *lenp = 3;
1746                 return FILEID_INVALID;
1747         }
1748
1749         data[0] = inode->i_ino;
1750         data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1751         data[2] = inode->i_generation;
1752         *lenp = 3;
1753         if (parent) {
1754                 data[3] = parent->i_ino;
1755                 data[4] = le32_to_cpu(INODE_PKEY(parent)->k_dir_id);
1756                 *lenp = 5;
1757                 if (maxlen >= 6) {
1758                         data[5] = parent->i_generation;
1759                         *lenp = 6;
1760                 }
1761         }
1762         return *lenp;
1763 }
1764
1765 /*
1766  * looks for stat data, then copies fields to it, marks the buffer
1767  * containing stat data as dirty
1768  */
1769 /*
1770  * reiserfs inodes are never really dirty, since the dirty inode call
1771  * always logs them.  This call allows the VFS inode marking routines
1772  * to properly mark inodes for datasync and such, but only actually
1773  * does something when called for a synchronous update.
1774  */
1775 int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1776 {
1777         struct reiserfs_transaction_handle th;
1778         int jbegin_count = 1;
1779
1780         if (inode->i_sb->s_flags & MS_RDONLY)
1781                 return -EROFS;
1782         /*
1783          * memory pressure can sometimes initiate write_inode calls with
1784          * sync == 1,
1785          * these cases are just when the system needs ram, not when the
1786          * inode needs to reach disk for safety, and they can safely be
1787          * ignored because the altered inode has already been logged.
1788          */
1789         if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) {
1790                 reiserfs_write_lock(inode->i_sb);
1791                 if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
1792                         reiserfs_update_sd(&th, inode);
1793                         journal_end_sync(&th);
1794                 }
1795                 reiserfs_write_unlock(inode->i_sb);
1796         }
1797         return 0;
1798 }
1799
1800 /*
1801  * stat data of new object is inserted already, this inserts the item
1802  * containing "." and ".." entries
1803  */
1804 static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
1805                                   struct inode *inode,
1806                                   struct item_head *ih, struct treepath *path,
1807                                   struct inode *dir)
1808 {
1809         struct super_block *sb = th->t_super;
1810         char empty_dir[EMPTY_DIR_SIZE];
1811         char *body = empty_dir;
1812         struct cpu_key key;
1813         int retval;
1814
1815         BUG_ON(!th->t_trans_id);
1816
1817         _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
1818                       le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
1819                       TYPE_DIRENTRY, 3 /*key length */ );
1820
1821         /*
1822          * compose item head for new item. Directories consist of items of
1823          * old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
1824          * is done by reiserfs_new_inode
1825          */
1826         if (old_format_only(sb)) {
1827                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1828                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
1829
1830                 make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
1831                                        ih->ih_key.k_objectid,
1832                                        INODE_PKEY(dir)->k_dir_id,
1833                                        INODE_PKEY(dir)->k_objectid);
1834         } else {
1835                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1836                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
1837
1838                 make_empty_dir_item(body, ih->ih_key.k_dir_id,
1839                                     ih->ih_key.k_objectid,
1840                                     INODE_PKEY(dir)->k_dir_id,
1841                                     INODE_PKEY(dir)->k_objectid);
1842         }
1843
1844         /* look for place in the tree for new item */
1845         retval = search_item(sb, &key, path);
1846         if (retval == IO_ERROR) {
1847                 reiserfs_error(sb, "vs-13080",
1848                                "i/o failure occurred creating new directory");
1849                 return -EIO;
1850         }
1851         if (retval == ITEM_FOUND) {
1852                 pathrelse(path);
1853                 reiserfs_warning(sb, "vs-13070",
1854                                  "object with this key exists (%k)",
1855                                  &(ih->ih_key));
1856                 return -EEXIST;
1857         }
1858
1859         /* insert item, that is empty directory item */
1860         return reiserfs_insert_item(th, path, &key, ih, inode, body);
1861 }
1862
1863 /*
1864  * stat data of object has been inserted, this inserts the item
1865  * containing the body of symlink
1866  */
1867 static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th,
1868                                 struct inode *inode,
1869                                 struct item_head *ih,
1870                                 struct treepath *path, const char *symname,
1871                                 int item_len)
1872 {
1873         struct super_block *sb = th->t_super;
1874         struct cpu_key key;
1875         int retval;
1876
1877         BUG_ON(!th->t_trans_id);
1878
1879         _make_cpu_key(&key, KEY_FORMAT_3_5,
1880                       le32_to_cpu(ih->ih_key.k_dir_id),
1881                       le32_to_cpu(ih->ih_key.k_objectid),
1882                       1, TYPE_DIRECT, 3 /*key length */ );
1883
1884         make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
1885                           0 /*free_space */ );
1886
1887         /* look for place in the tree for new item */
1888         retval = search_item(sb, &key, path);
1889         if (retval == IO_ERROR) {
1890                 reiserfs_error(sb, "vs-13080",
1891                                "i/o failure occurred creating new symlink");
1892                 return -EIO;
1893         }
1894         if (retval == ITEM_FOUND) {
1895                 pathrelse(path);
1896                 reiserfs_warning(sb, "vs-13080",
1897                                  "object with this key exists (%k)",
1898                                  &(ih->ih_key));
1899                 return -EEXIST;
1900         }
1901
1902         /* insert item, that is body of symlink */
1903         return reiserfs_insert_item(th, path, &key, ih, inode, symname);
1904 }
1905
1906 /*
1907  * inserts the stat data into the tree, and then calls
1908  * reiserfs_new_directory (to insert ".", ".." item if new object is
1909  * directory) or reiserfs_new_symlink (to insert symlink body if new
1910  * object is symlink) or nothing (if new object is regular file)
1911
1912  * NOTE! uid and gid must already be set in the inode.  If we return
1913  * non-zero due to an error, we have to drop the quota previously allocated
1914  * for the fresh inode.  This can only be done outside a transaction, so
1915  * if we return non-zero, we also end the transaction.
1916  *
1917  * @th: active transaction handle
1918  * @dir: parent directory for new inode
1919  * @mode: mode of new inode
1920  * @symname: symlink contents if inode is symlink
1921  * @isize: 0 for regular file, EMPTY_DIR_SIZE for dirs, strlen(symname) for
1922  *         symlinks
1923  * @inode: inode to be filled
1924  * @security: optional security context to associate with this inode
1925  */
1926 int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1927                        struct inode *dir, umode_t mode, const char *symname,
1928                        /* 0 for regular, EMTRY_DIR_SIZE for dirs,
1929                           strlen (symname) for symlinks) */
1930                        loff_t i_size, struct dentry *dentry,
1931                        struct inode *inode,
1932                        struct reiserfs_security_handle *security)
1933 {
1934         struct super_block *sb = dir->i_sb;
1935         struct reiserfs_iget_args args;
1936         INITIALIZE_PATH(path_to_key);
1937         struct cpu_key key;
1938         struct item_head ih;
1939         struct stat_data sd;
1940         int retval;
1941         int err;
1942         int depth;
1943
1944         BUG_ON(!th->t_trans_id);
1945
1946         depth = reiserfs_write_unlock_nested(sb);
1947         err = dquot_alloc_inode(inode);
1948         reiserfs_write_lock_nested(sb, depth);
1949         if (err)
1950                 goto out_end_trans;
1951         if (!dir->i_nlink) {
1952                 err = -EPERM;
1953                 goto out_bad_inode;
1954         }
1955
1956         /* item head of new item */
1957         ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
1958         ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
1959         if (!ih.ih_key.k_objectid) {
1960                 err = -ENOMEM;
1961                 goto out_bad_inode;
1962         }
1963         args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
1964         if (old_format_only(sb))
1965                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
1966                                   TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
1967         else
1968                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
1969                                   TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
1970         memcpy(INODE_PKEY(inode), &ih.ih_key, KEY_SIZE);
1971         args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
1972
1973         depth = reiserfs_write_unlock_nested(inode->i_sb);
1974         err = insert_inode_locked4(inode, args.objectid,
1975                              reiserfs_find_actor, &args);
1976         reiserfs_write_lock_nested(inode->i_sb, depth);
1977         if (err) {
1978                 err = -EINVAL;
1979                 goto out_bad_inode;
1980         }
1981
1982         if (old_format_only(sb))
1983                 /*
1984                  * not a perfect generation count, as object ids can be reused,
1985                  * but this is as good as reiserfs can do right now.
1986                  * note that the private part of inode isn't filled in yet,
1987                  * we have to use the directory.
1988                  */
1989                 inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
1990         else
1991 #if defined( USE_INODE_GENERATION_COUNTER )
1992                 inode->i_generation =
1993                     le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
1994 #else
1995                 inode->i_generation = ++event;
1996 #endif
1997
1998         /* fill stat data */
1999         set_nlink(inode, (S_ISDIR(mode) ? 2 : 1));
2000
2001         /* uid and gid must already be set by the caller for quota init */
2002
2003         /* symlink cannot be immutable or append only, right? */
2004         if (S_ISLNK(inode->i_mode))
2005                 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
2006
2007         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
2008         inode->i_size = i_size;
2009         inode->i_blocks = 0;
2010         inode->i_bytes = 0;
2011         REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
2012             U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
2013
2014         INIT_LIST_HEAD(&REISERFS_I(inode)->i_prealloc_list);
2015         REISERFS_I(inode)->i_flags = 0;
2016         REISERFS_I(inode)->i_prealloc_block = 0;
2017         REISERFS_I(inode)->i_prealloc_count = 0;
2018         REISERFS_I(inode)->i_trans_id = 0;
2019         REISERFS_I(inode)->i_jl = NULL;
2020         REISERFS_I(inode)->i_attrs =
2021             REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
2022         sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
2023         reiserfs_init_xattr_rwsem(inode);
2024
2025         /* key to search for correct place for new stat data */
2026         _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
2027                       le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
2028                       TYPE_STAT_DATA, 3 /*key length */ );
2029
2030         /* find proper place for inserting of stat data */
2031         retval = search_item(sb, &key, &path_to_key);
2032         if (retval == IO_ERROR) {
2033                 err = -EIO;
2034                 goto out_bad_inode;
2035         }
2036         if (retval == ITEM_FOUND) {
2037                 pathrelse(&path_to_key);
2038                 err = -EEXIST;
2039                 goto out_bad_inode;
2040         }
2041         if (old_format_only(sb)) {
2042                 /* i_uid or i_gid is too big to be stored in stat data v3.5 */
2043                 if (i_uid_read(inode) & ~0xffff || i_gid_read(inode) & ~0xffff) {
2044                         pathrelse(&path_to_key);
2045                         err = -EINVAL;
2046                         goto out_bad_inode;
2047                 }
2048                 inode2sd_v1(&sd, inode, inode->i_size);
2049         } else {
2050                 inode2sd(&sd, inode, inode->i_size);
2051         }
2052         /*
2053          * store in in-core inode the key of stat data and version all
2054          * object items will have (directory items will have old offset
2055          * format, other new objects will consist of new items)
2056          */
2057         if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
2058                 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
2059         else
2060                 set_inode_item_key_version(inode, KEY_FORMAT_3_6);
2061         if (old_format_only(sb))
2062                 set_inode_sd_version(inode, STAT_DATA_V1);
2063         else
2064                 set_inode_sd_version(inode, STAT_DATA_V2);
2065
2066         /* insert the stat data into the tree */
2067 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
2068         if (REISERFS_I(dir)->new_packing_locality)
2069                 th->displace_new_blocks = 1;
2070 #endif
2071         retval =
2072             reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
2073                                  (char *)(&sd));
2074         if (retval) {
2075                 err = retval;
2076                 reiserfs_check_path(&path_to_key);
2077                 goto out_bad_inode;
2078         }
2079 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
2080         if (!th->displace_new_blocks)
2081                 REISERFS_I(dir)->new_packing_locality = 0;
2082 #endif
2083         if (S_ISDIR(mode)) {
2084                 /* insert item with "." and ".." */
2085                 retval =
2086                     reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
2087         }
2088
2089         if (S_ISLNK(mode)) {
2090                 /* insert body of symlink */
2091                 if (!old_format_only(sb))
2092                         i_size = ROUND_UP(i_size);
2093                 retval =
2094                     reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
2095                                          i_size);
2096         }
2097         if (retval) {
2098                 err = retval;
2099                 reiserfs_check_path(&path_to_key);
2100                 journal_end(th);
2101                 goto out_inserted_sd;
2102         }
2103
2104         if (reiserfs_posixacl(inode->i_sb)) {
2105                 reiserfs_write_unlock(inode->i_sb);
2106                 retval = reiserfs_inherit_default_acl(th, dir, dentry, inode);
2107                 reiserfs_write_lock(inode->i_sb);
2108                 if (retval) {
2109                         err = retval;
2110                         reiserfs_check_path(&path_to_key);
2111                         journal_end(th);
2112                         goto out_inserted_sd;
2113                 }
2114         } else if (inode->i_sb->s_flags & MS_POSIXACL) {
2115                 reiserfs_warning(inode->i_sb, "jdm-13090",
2116                                  "ACLs aren't enabled in the fs, "
2117                                  "but vfs thinks they are!");
2118         } else if (IS_PRIVATE(dir))
2119                 inode->i_flags |= S_PRIVATE;
2120
2121         if (security->name) {
2122                 reiserfs_write_unlock(inode->i_sb);
2123                 retval = reiserfs_security_write(th, inode, security);
2124                 reiserfs_write_lock(inode->i_sb);
2125                 if (retval) {
2126                         err = retval;
2127                         reiserfs_check_path(&path_to_key);
2128                         retval = journal_end(th);
2129                         if (retval)
2130                                 err = retval;
2131                         goto out_inserted_sd;
2132                 }
2133         }
2134
2135         reiserfs_update_sd(th, inode);
2136         reiserfs_check_path(&path_to_key);
2137
2138         return 0;
2139
2140 out_bad_inode:
2141         /* Invalidate the object, nothing was inserted yet */
2142         INODE_PKEY(inode)->k_objectid = 0;
2143
2144         /* Quota change must be inside a transaction for journaling */
2145         depth = reiserfs_write_unlock_nested(inode->i_sb);
2146         dquot_free_inode(inode);
2147         reiserfs_write_lock_nested(inode->i_sb, depth);
2148
2149 out_end_trans:
2150         journal_end(th);
2151         /*
2152          * Drop can be outside and it needs more credits so it's better
2153          * to have it outside
2154          */
2155         depth = reiserfs_write_unlock_nested(inode->i_sb);
2156         dquot_drop(inode);
2157         reiserfs_write_lock_nested(inode->i_sb, depth);
2158         inode->i_flags |= S_NOQUOTA;
2159         make_bad_inode(inode);
2160
2161 out_inserted_sd:
2162         clear_nlink(inode);
2163         th->t_trans_id = 0;     /* so the caller can't use this handle later */
2164         unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
2165         iput(inode);
2166         return err;
2167 }
2168
2169 /*
2170  * finds the tail page in the page cache,
2171  * reads the last block in.
2172  *
2173  * On success, page_result is set to a locked, pinned page, and bh_result
2174  * is set to an up to date buffer for the last block in the file.  returns 0.
2175  *
2176  * tail conversion is not done, so bh_result might not be valid for writing
2177  * check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
2178  * trying to write the block.
2179  *
2180  * on failure, nonzero is returned, page_result and bh_result are untouched.
2181  */
2182 static int grab_tail_page(struct inode *inode,
2183                           struct page **page_result,
2184                           struct buffer_head **bh_result)
2185 {
2186
2187         /*
2188          * we want the page with the last byte in the file,
2189          * not the page that will hold the next byte for appending
2190          */
2191         unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
2192         unsigned long pos = 0;
2193         unsigned long start = 0;
2194         unsigned long blocksize = inode->i_sb->s_blocksize;
2195         unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1);
2196         struct buffer_head *bh;
2197         struct buffer_head *head;
2198         struct page *page;
2199         int error;
2200
2201         /*
2202          * we know that we are only called with inode->i_size > 0.
2203          * we also know that a file tail can never be as big as a block
2204          * If i_size % blocksize == 0, our file is currently block aligned
2205          * and it won't need converting or zeroing after a truncate.
2206          */
2207         if ((offset & (blocksize - 1)) == 0) {
2208                 return -ENOENT;
2209         }
2210         page = grab_cache_page(inode->i_mapping, index);
2211         error = -ENOMEM;
2212         if (!page) {
2213                 goto out;
2214         }
2215         /* start within the page of the last block in the file */
2216         start = (offset / blocksize) * blocksize;
2217
2218         error = __block_write_begin(page, start, offset - start,
2219                                     reiserfs_get_block_create_0);
2220         if (error)
2221                 goto unlock;
2222
2223         head = page_buffers(page);
2224         bh = head;
2225         do {
2226                 if (pos >= start) {
2227                         break;
2228                 }
2229                 bh = bh->b_this_page;
2230                 pos += blocksize;
2231         } while (bh != head);
2232
2233         if (!buffer_uptodate(bh)) {
2234                 /*
2235                  * note, this should never happen, prepare_write should be
2236                  * taking care of this for us.  If the buffer isn't up to
2237                  * date, I've screwed up the code to find the buffer, or the
2238                  * code to call prepare_write
2239                  */
2240                 reiserfs_error(inode->i_sb, "clm-6000",
2241                                "error reading block %lu", bh->b_blocknr);
2242                 error = -EIO;
2243                 goto unlock;
2244         }
2245         *bh_result = bh;
2246         *page_result = page;
2247
2248 out:
2249         return error;
2250
2251 unlock:
2252         unlock_page(page);
2253         page_cache_release(page);
2254         return error;
2255 }
2256
2257 /*
2258  * vfs version of truncate file.  Must NOT be called with
2259  * a transaction already started.
2260  *
2261  * some code taken from block_truncate_page
2262  */
2263 int reiserfs_truncate_file(struct inode *inode, int update_timestamps)
2264 {
2265         struct reiserfs_transaction_handle th;
2266         /* we want the offset for the first byte after the end of the file */
2267         unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2268         unsigned blocksize = inode->i_sb->s_blocksize;
2269         unsigned length;
2270         struct page *page = NULL;
2271         int error;
2272         struct buffer_head *bh = NULL;
2273         int err2;
2274
2275         reiserfs_write_lock(inode->i_sb);
2276
2277         if (inode->i_size > 0) {
2278                 error = grab_tail_page(inode, &page, &bh);
2279                 if (error) {
2280                         /*
2281                          * -ENOENT means we truncated past the end of the
2282                          * file, and get_block_create_0 could not find a
2283                          * block to read in, which is ok.
2284                          */
2285                         if (error != -ENOENT)
2286                                 reiserfs_error(inode->i_sb, "clm-6001",
2287                                                "grab_tail_page failed %d",
2288                                                error);
2289                         page = NULL;
2290                         bh = NULL;
2291                 }
2292         }
2293
2294         /*
2295          * so, if page != NULL, we have a buffer head for the offset at
2296          * the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
2297          * then we have an unformatted node.  Otherwise, we have a direct item,
2298          * and no zeroing is required on disk.  We zero after the truncate,
2299          * because the truncate might pack the item anyway
2300          * (it will unmap bh if it packs).
2301          *
2302          * it is enough to reserve space in transaction for 2 balancings:
2303          * one for "save" link adding and another for the first
2304          * cut_from_item. 1 is for update_sd
2305          */
2306         error = journal_begin(&th, inode->i_sb,
2307                               JOURNAL_PER_BALANCE_CNT * 2 + 1);
2308         if (error)
2309                 goto out;
2310         reiserfs_update_inode_transaction(inode);
2311         if (update_timestamps)
2312                 /*
2313                  * we are doing real truncate: if the system crashes
2314                  * before the last transaction of truncating gets committed
2315                  * - on reboot the file either appears truncated properly
2316                  * or not truncated at all
2317                  */
2318                 add_save_link(&th, inode, 1);
2319         err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps);
2320         error = journal_end(&th);
2321         if (error)
2322                 goto out;
2323
2324         /* check reiserfs_do_truncate after ending the transaction */
2325         if (err2) {
2326                 error = err2;
2327                 goto out;
2328         }
2329
2330         if (update_timestamps) {
2331                 error = remove_save_link(inode, 1 /* truncate */);
2332                 if (error)
2333                         goto out;
2334         }
2335
2336         if (page) {
2337                 length = offset & (blocksize - 1);
2338                 /* if we are not on a block boundary */
2339                 if (length) {
2340                         length = blocksize - length;
2341                         zero_user(page, offset, length);
2342                         if (buffer_mapped(bh) && bh->b_blocknr != 0) {
2343                                 mark_buffer_dirty(bh);
2344                         }
2345                 }
2346                 unlock_page(page);
2347                 page_cache_release(page);
2348         }
2349
2350         reiserfs_write_unlock(inode->i_sb);
2351
2352         return 0;
2353 out:
2354         if (page) {
2355                 unlock_page(page);
2356                 page_cache_release(page);
2357         }
2358
2359         reiserfs_write_unlock(inode->i_sb);
2360
2361         return error;
2362 }
2363
2364 static int map_block_for_writepage(struct inode *inode,
2365                                    struct buffer_head *bh_result,
2366                                    unsigned long block)
2367 {
2368         struct reiserfs_transaction_handle th;
2369         int fs_gen;
2370         struct item_head tmp_ih;
2371         struct item_head *ih;
2372         struct buffer_head *bh;
2373         __le32 *item;
2374         struct cpu_key key;
2375         INITIALIZE_PATH(path);
2376         int pos_in_item;
2377         int jbegin_count = JOURNAL_PER_BALANCE_CNT;
2378         loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
2379         int retval;
2380         int use_get_block = 0;
2381         int bytes_copied = 0;
2382         int copy_size;
2383         int trans_running = 0;
2384
2385         /*
2386          * catch places below that try to log something without
2387          * starting a trans
2388          */
2389         th.t_trans_id = 0;
2390
2391         if (!buffer_uptodate(bh_result)) {
2392                 return -EIO;
2393         }
2394
2395         kmap(bh_result->b_page);
2396 start_over:
2397         reiserfs_write_lock(inode->i_sb);
2398         make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
2399
2400 research:
2401         retval = search_for_position_by_key(inode->i_sb, &key, &path);
2402         if (retval != POSITION_FOUND) {
2403                 use_get_block = 1;
2404                 goto out;
2405         }
2406
2407         bh = get_last_bh(&path);
2408         ih = tp_item_head(&path);
2409         item = tp_item_body(&path);
2410         pos_in_item = path.pos_in_item;
2411
2412         /* we've found an unformatted node */
2413         if (indirect_item_found(retval, ih)) {
2414                 if (bytes_copied > 0) {
2415                         reiserfs_warning(inode->i_sb, "clm-6002",
2416                                          "bytes_copied %d", bytes_copied);
2417                 }
2418                 if (!get_block_num(item, pos_in_item)) {
2419                         /* crap, we are writing to a hole */
2420                         use_get_block = 1;
2421                         goto out;
2422                 }
2423                 set_block_dev_mapped(bh_result,
2424                                      get_block_num(item, pos_in_item), inode);
2425         } else if (is_direct_le_ih(ih)) {
2426                 char *p;
2427                 p = page_address(bh_result->b_page);
2428                 p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
2429                 copy_size = ih_item_len(ih) - pos_in_item;
2430
2431                 fs_gen = get_generation(inode->i_sb);
2432                 copy_item_head(&tmp_ih, ih);
2433
2434                 if (!trans_running) {
2435                         /* vs-3050 is gone, no need to drop the path */
2436                         retval = journal_begin(&th, inode->i_sb, jbegin_count);
2437                         if (retval)
2438                                 goto out;
2439                         reiserfs_update_inode_transaction(inode);
2440                         trans_running = 1;
2441                         if (fs_changed(fs_gen, inode->i_sb)
2442                             && item_moved(&tmp_ih, &path)) {
2443                                 reiserfs_restore_prepared_buffer(inode->i_sb,
2444                                                                  bh);
2445                                 goto research;
2446                         }
2447                 }
2448
2449                 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
2450
2451                 if (fs_changed(fs_gen, inode->i_sb)
2452                     && item_moved(&tmp_ih, &path)) {
2453                         reiserfs_restore_prepared_buffer(inode->i_sb, bh);
2454                         goto research;
2455                 }
2456
2457                 memcpy(ih_item_body(bh, ih) + pos_in_item, p + bytes_copied,
2458                        copy_size);
2459
2460                 journal_mark_dirty(&th, bh);
2461                 bytes_copied += copy_size;
2462                 set_block_dev_mapped(bh_result, 0, inode);
2463
2464                 /* are there still bytes left? */
2465                 if (bytes_copied < bh_result->b_size &&
2466                     (byte_offset + bytes_copied) < inode->i_size) {
2467                         set_cpu_key_k_offset(&key,
2468                                              cpu_key_k_offset(&key) +
2469                                              copy_size);
2470                         goto research;
2471                 }
2472         } else {
2473                 reiserfs_warning(inode->i_sb, "clm-6003",
2474                                  "bad item inode %lu", inode->i_ino);
2475                 retval = -EIO;
2476                 goto out;
2477         }
2478         retval = 0;
2479
2480 out:
2481         pathrelse(&path);
2482         if (trans_running) {
2483                 int err = journal_end(&th);
2484                 if (err)
2485                         retval = err;
2486                 trans_running = 0;
2487         }
2488         reiserfs_write_unlock(inode->i_sb);
2489
2490         /* this is where we fill in holes in the file. */
2491         if (use_get_block) {
2492                 retval = reiserfs_get_block(inode, block, bh_result,
2493                                             GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
2494                                             | GET_BLOCK_NO_DANGLE);
2495                 if (!retval) {
2496                         if (!buffer_mapped(bh_result)
2497                             || bh_result->b_blocknr == 0) {
2498                                 /* get_block failed to find a mapped unformatted node. */
2499                                 use_get_block = 0;
2500                                 goto start_over;
2501                         }
2502                 }
2503         }
2504         kunmap(bh_result->b_page);
2505
2506         if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
2507                 /*
2508                  * we've copied data from the page into the direct item, so the
2509                  * buffer in the page is now clean, mark it to reflect that.
2510                  */
2511                 lock_buffer(bh_result);
2512                 clear_buffer_dirty(bh_result);
2513                 unlock_buffer(bh_result);
2514         }
2515         return retval;
2516 }
2517
2518 /*
2519  * mason@suse.com: updated in 2.5.54 to follow the same general io
2520  * start/recovery path as __block_write_full_page, along with special
2521  * code to handle reiserfs tails.
2522  */
2523 static int reiserfs_write_full_page(struct page *page,
2524                                     struct writeback_control *wbc)
2525 {
2526         struct inode *inode = page->mapping->host;
2527         unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
2528         int error = 0;
2529         unsigned long block;
2530         sector_t last_block;
2531         struct buffer_head *head, *bh;
2532         int partial = 0;
2533         int nr = 0;
2534         int checked = PageChecked(page);
2535         struct reiserfs_transaction_handle th;
2536         struct super_block *s = inode->i_sb;
2537         int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
2538         th.t_trans_id = 0;
2539
2540         /* no logging allowed when nonblocking or from PF_MEMALLOC */
2541         if (checked && (current->flags & PF_MEMALLOC)) {
2542                 redirty_page_for_writepage(wbc, page);
2543                 unlock_page(page);
2544                 return 0;
2545         }
2546
2547         /*
2548          * The page dirty bit is cleared before writepage is called, which
2549          * means we have to tell create_empty_buffers to make dirty buffers
2550          * The page really should be up to date at this point, so tossing
2551          * in the BH_Uptodate is just a sanity check.
2552          */
2553         if (!page_has_buffers(page)) {
2554                 create_empty_buffers(page, s->s_blocksize,
2555                                      (1 << BH_Dirty) | (1 << BH_Uptodate));
2556         }
2557         head = page_buffers(page);
2558
2559         /*
2560          * last page in the file, zero out any contents past the
2561          * last byte in the file
2562          */
2563         if (page->index >= end_index) {
2564                 unsigned last_offset;
2565
2566                 last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2567                 /* no file contents in this page */
2568                 if (page->index >= end_index + 1 || !last_offset) {
2569                         unlock_page(page);
2570                         return 0;
2571                 }
2572                 zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
2573         }
2574         bh = head;
2575         block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
2576         last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
2577         /* first map all the buffers, logging any direct items we find */
2578         do {
2579                 if (block > last_block) {
2580                         /*
2581                          * This can happen when the block size is less than
2582                          * the page size.  The corresponding bytes in the page
2583                          * were zero filled above
2584                          */
2585                         clear_buffer_dirty(bh);
2586                         set_buffer_uptodate(bh);
2587                 } else if ((checked || buffer_dirty(bh)) &&
2588                            (!buffer_mapped(bh) || (buffer_mapped(bh)
2589                                                        && bh->b_blocknr ==
2590                                                        0))) {
2591                         /*
2592                          * not mapped yet, or it points to a direct item, search
2593                          * the btree for the mapping info, and log any direct
2594                          * items found
2595                          */
2596                         if ((error = map_block_for_writepage(inode, bh, block))) {
2597                                 goto fail;
2598                         }
2599                 }
2600                 bh = bh->b_this_page;
2601                 block++;
2602         } while (bh != head);
2603
2604         /*
2605          * we start the transaction after map_block_for_writepage,
2606          * because it can create holes in the file (an unbounded operation).
2607          * starting it here, we can make a reliable estimate for how many
2608          * blocks we're going to log
2609          */
2610         if (checked) {
2611                 ClearPageChecked(page);
2612                 reiserfs_write_lock(s);
2613                 error = journal_begin(&th, s, bh_per_page + 1);
2614                 if (error) {
2615                         reiserfs_write_unlock(s);
2616                         goto fail;
2617                 }
2618                 reiserfs_update_inode_transaction(inode);
2619         }
2620         /* now go through and lock any dirty buffers on the page */
2621         do {
2622                 get_bh(bh);
2623                 if (!buffer_mapped(bh))
2624                         continue;
2625                 if (buffer_mapped(bh) && bh->b_blocknr == 0)
2626                         continue;
2627
2628                 if (checked) {
2629                         reiserfs_prepare_for_journal(s, bh, 1);
2630                         journal_mark_dirty(&th, bh);
2631                         continue;
2632                 }
2633                 /*
2634                  * from this point on, we know the buffer is mapped to a
2635                  * real block and not a direct item
2636                  */
2637                 if (wbc->sync_mode != WB_SYNC_NONE) {
2638                         lock_buffer(bh);
2639                 } else {
2640                         if (!trylock_buffer(bh)) {
2641                                 redirty_page_for_writepage(wbc, page);
2642                                 continue;
2643                         }
2644                 }
2645                 if (test_clear_buffer_dirty(bh)) {
2646                         mark_buffer_async_write(bh);
2647                 } else {
2648                         unlock_buffer(bh);
2649                 }
2650         } while ((bh = bh->b_this_page) != head);
2651
2652         if (checked) {
2653                 error = journal_end(&th);
2654                 reiserfs_write_unlock(s);
2655                 if (error)
2656                         goto fail;
2657         }
2658         BUG_ON(PageWriteback(page));
2659         set_page_writeback(page);
2660         unlock_page(page);
2661
2662         /*
2663          * since any buffer might be the only dirty buffer on the page,
2664          * the first submit_bh can bring the page out of writeback.
2665          * be careful with the buffers.
2666          */
2667         do {
2668                 struct buffer_head *next = bh->b_this_page;
2669                 if (buffer_async_write(bh)) {
2670                         submit_bh(WRITE, bh);
2671                         nr++;
2672                 }
2673                 put_bh(bh);
2674                 bh = next;
2675         } while (bh != head);
2676
2677         error = 0;
2678 done:
2679         if (nr == 0) {
2680                 /*
2681                  * if this page only had a direct item, it is very possible for
2682                  * no io to be required without there being an error.  Or,
2683                  * someone else could have locked them and sent them down the
2684                  * pipe without locking the page
2685                  */
2686                 bh = head;
2687                 do {
2688                         if (!buffer_uptodate(bh)) {
2689                                 partial = 1;
2690                                 break;
2691                         }
2692                         bh = bh->b_this_page;
2693                 } while (bh != head);
2694                 if (!partial)
2695                         SetPageUptodate(page);
2696                 end_page_writeback(page);
2697         }
2698         return error;
2699
2700 fail:
2701         /*
2702          * catches various errors, we need to make sure any valid dirty blocks
2703          * get to the media.  The page is currently locked and not marked for
2704          * writeback
2705          */
2706         ClearPageUptodate(page);
2707         bh = head;
2708         do {
2709                 get_bh(bh);
2710                 if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
2711                         lock_buffer(bh);
2712                         mark_buffer_async_write(bh);
2713                 } else {
2714                         /*
2715                          * clear any dirty bits that might have come from
2716                          * getting attached to a dirty page
2717                          */
2718                         clear_buffer_dirty(bh);
2719                 }
2720                 bh = bh->b_this_page;
2721         } while (bh != head);
2722         SetPageError(page);
2723         BUG_ON(PageWriteback(page));
2724         set_page_writeback(page);
2725         unlock_page(page);
2726         do {
2727                 struct buffer_head *next = bh->b_this_page;
2728                 if (buffer_async_write(bh)) {
2729                         clear_buffer_dirty(bh);
2730                         submit_bh(WRITE, bh);
2731                         nr++;
2732                 }
2733                 put_bh(bh);
2734                 bh = next;
2735         } while (bh != head);
2736         goto done;
2737 }
2738
2739 static int reiserfs_readpage(struct file *f, struct page *page)
2740 {
2741         return block_read_full_page(page, reiserfs_get_block);
2742 }
2743
2744 static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
2745 {
2746         struct inode *inode = page->mapping->host;
2747         reiserfs_wait_on_write_block(inode->i_sb);
2748         return reiserfs_write_full_page(page, wbc);
2749 }
2750
2751 static void reiserfs_truncate_failed_write(struct inode *inode)
2752 {
2753         truncate_inode_pages(inode->i_mapping, inode->i_size);
2754         reiserfs_truncate_file(inode, 0);
2755 }
2756
2757 static int reiserfs_write_begin(struct file *file,
2758                                 struct address_space *mapping,
2759                                 loff_t pos, unsigned len, unsigned flags,
2760                                 struct page **pagep, void **fsdata)
2761 {
2762         struct inode *inode;
2763         struct page *page;
2764         pgoff_t index;
2765         int ret;
2766         int old_ref = 0;
2767
2768         inode = mapping->host;
2769         *fsdata = NULL;
2770         if (flags & AOP_FLAG_CONT_EXPAND &&
2771             (pos & (inode->i_sb->s_blocksize - 1)) == 0) {
2772                 pos ++;
2773                 *fsdata = (void *)(unsigned long)flags;
2774         }
2775
2776         index = pos >> PAGE_CACHE_SHIFT;
2777         page = grab_cache_page_write_begin(mapping, index, flags);
2778         if (!page)
2779                 return -ENOMEM;
2780         *pagep = page;
2781
2782         reiserfs_wait_on_write_block(inode->i_sb);
2783         fix_tail_page_for_writing(page);
2784         if (reiserfs_transaction_running(inode->i_sb)) {
2785                 struct reiserfs_transaction_handle *th;
2786                 th = (struct reiserfs_transaction_handle *)current->
2787                     journal_info;
2788                 BUG_ON(!th->t_refcount);
2789                 BUG_ON(!th->t_trans_id);
2790                 old_ref = th->t_refcount;
2791                 th->t_refcount++;
2792         }
2793         ret = __block_write_begin(page, pos, len, reiserfs_get_block);
2794         if (ret && reiserfs_transaction_running(inode->i_sb)) {
2795                 struct reiserfs_transaction_handle *th = current->journal_info;
2796                 /*
2797                  * this gets a little ugly.  If reiserfs_get_block returned an
2798                  * error and left a transacstion running, we've got to close
2799                  * it, and we've got to free handle if it was a persistent
2800                  * transaction.
2801                  *
2802                  * But, if we had nested into an existing transaction, we need
2803                  * to just drop the ref count on the handle.
2804                  *
2805                  * If old_ref == 0, the transaction is from reiserfs_get_block,
2806                  * and it was a persistent trans.  Otherwise, it was nested
2807                  * above.
2808                  */
2809                 if (th->t_refcount > old_ref) {
2810                         if (old_ref)
2811                                 th->t_refcount--;
2812                         else {
2813                                 int err;
2814                                 reiserfs_write_lock(inode->i_sb);
2815                                 err = reiserfs_end_persistent_transaction(th);
2816                                 reiserfs_write_unlock(inode->i_sb);
2817                                 if (err)
2818                                         ret = err;
2819                         }
2820                 }
2821         }
2822         if (ret) {
2823                 unlock_page(page);
2824                 page_cache_release(page);
2825                 /* Truncate allocated blocks */
2826                 reiserfs_truncate_failed_write(inode);
2827         }
2828         return ret;
2829 }
2830
2831 int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len)
2832 {
2833         struct inode *inode = page->mapping->host;
2834         int ret;
2835         int old_ref = 0;
2836         int depth;
2837
2838         depth = reiserfs_write_unlock_nested(inode->i_sb);
2839         reiserfs_wait_on_write_block(inode->i_sb);
2840         reiserfs_write_lock_nested(inode->i_sb, depth);
2841
2842         fix_tail_page_for_writing(page);
2843         if (reiserfs_transaction_running(inode->i_sb)) {
2844                 struct reiserfs_transaction_handle *th;
2845                 th = (struct reiserfs_transaction_handle *)current->
2846                     journal_info;
2847                 BUG_ON(!th->t_refcount);
2848                 BUG_ON(!th->t_trans_id);
2849                 old_ref = th->t_refcount;
2850                 th->t_refcount++;
2851         }
2852
2853         ret = __block_write_begin(page, from, len, reiserfs_get_block);
2854         if (ret && reiserfs_transaction_running(inode->i_sb)) {
2855                 struct reiserfs_transaction_handle *th = current->journal_info;
2856                 /*
2857                  * this gets a little ugly.  If reiserfs_get_block returned an
2858                  * error and left a transacstion running, we've got to close
2859                  * it, and we've got to free handle if it was a persistent
2860                  * transaction.
2861                  *
2862                  * But, if we had nested into an existing transaction, we need
2863                  * to just drop the ref count on the handle.
2864                  *
2865                  * If old_ref == 0, the transaction is from reiserfs_get_block,
2866                  * and it was a persistent trans.  Otherwise, it was nested
2867                  * above.
2868                  */
2869                 if (th->t_refcount > old_ref) {
2870                         if (old_ref)
2871                                 th->t_refcount--;
2872                         else {
2873                                 int err;
2874                                 reiserfs_write_lock(inode->i_sb);
2875                                 err = reiserfs_end_persistent_transaction(th);
2876                                 reiserfs_write_unlock(inode->i_sb);
2877                                 if (err)
2878                                         ret = err;
2879                         }
2880                 }
2881         }
2882         return ret;
2883
2884 }
2885
2886 static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
2887 {
2888         return generic_block_bmap(as, block, reiserfs_bmap);
2889 }
2890
2891 static int reiserfs_write_end(struct file *file, struct address_space *mapping,
2892                               loff_t pos, unsigned len, unsigned copied,
2893                               struct page *page, void *fsdata)
2894 {
2895         struct inode *inode = page->mapping->host;
2896         int ret = 0;
2897         int update_sd = 0;
2898         struct reiserfs_transaction_handle *th;
2899         unsigned start;
2900         bool locked = false;
2901
2902         if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
2903                 pos ++;
2904
2905         reiserfs_wait_on_write_block(inode->i_sb);
2906         if (reiserfs_transaction_running(inode->i_sb))
2907                 th = current->journal_info;
2908         else
2909                 th = NULL;
2910
2911         start = pos & (PAGE_CACHE_SIZE - 1);
2912         if (unlikely(copied < len)) {
2913                 if (!PageUptodate(page))
2914                         copied = 0;
2915
2916                 page_zero_new_buffers(page, start + copied, start + len);
2917         }
2918         flush_dcache_page(page);
2919
2920         reiserfs_commit_page(inode, page, start, start + copied);
2921
2922         /*
2923          * generic_commit_write does this for us, but does not update the
2924          * transaction tracking stuff when the size changes.  So, we have
2925          * to do the i_size updates here.
2926          */
2927         if (pos + copied > inode->i_size) {
2928                 struct reiserfs_transaction_handle myth;
2929                 reiserfs_write_lock(inode->i_sb);
2930                 locked = true;
2931                 /*
2932                  * If the file have grown beyond the border where it
2933                  * can have a tail, unmark it as needing a tail
2934                  * packing
2935                  */
2936                 if ((have_large_tails(inode->i_sb)
2937                      && inode->i_size > i_block_size(inode) * 4)
2938                     || (have_small_tails(inode->i_sb)
2939                         && inode->i_size > i_block_size(inode)))
2940                         REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2941
2942                 ret = journal_begin(&myth, inode->i_sb, 1);
2943                 if (ret)
2944                         goto journal_error;
2945
2946                 reiserfs_update_inode_transaction(inode);
2947                 inode->i_size = pos + copied;
2948                 /*
2949                  * this will just nest into our transaction.  It's important
2950                  * to use mark_inode_dirty so the inode gets pushed around on
2951                  * the dirty lists, and so that O_SYNC works as expected
2952                  */
2953                 mark_inode_dirty(inode);
2954                 reiserfs_update_sd(&myth, inode);
2955                 update_sd = 1;
2956                 ret = journal_end(&myth);
2957                 if (ret)
2958                         goto journal_error;
2959         }
2960         if (th) {
2961                 if (!locked) {
2962                         reiserfs_write_lock(inode->i_sb);
2963                         locked = true;
2964                 }
2965                 if (!update_sd)
2966                         mark_inode_dirty(inode);
2967                 ret = reiserfs_end_persistent_transaction(th);
2968                 if (ret)
2969                         goto out;
2970         }
2971
2972 out:
2973         if (locked)
2974                 reiserfs_write_unlock(inode->i_sb);
2975         unlock_page(page);
2976         page_cache_release(page);
2977
2978         if (pos + len > inode->i_size)
2979                 reiserfs_truncate_failed_write(inode);
2980
2981         return ret == 0 ? copied : ret;
2982
2983 journal_error:
2984         reiserfs_write_unlock(inode->i_sb);
2985         locked = false;
2986         if (th) {
2987                 if (!update_sd)
2988                         reiserfs_update_sd(th, inode);
2989                 ret = reiserfs_end_persistent_transaction(th);
2990         }
2991         goto out;
2992 }
2993
2994 int reiserfs_commit_write(struct file *f, struct page *page,
2995                           unsigned from, unsigned to)
2996 {
2997         struct inode *inode = page->mapping->host;
2998         loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
2999         int ret = 0;
3000         int update_sd = 0;
3001         struct reiserfs_transaction_handle *th = NULL;
3002         int depth;
3003
3004         depth = reiserfs_write_unlock_nested(inode->i_sb);
3005         reiserfs_wait_on_write_block(inode->i_sb);
3006         reiserfs_write_lock_nested(inode->i_sb, depth);
3007
3008         if (reiserfs_transaction_running(inode->i_sb)) {
3009                 th = current->journal_info;
3010         }
3011         reiserfs_commit_page(inode, page, from, to);
3012
3013         /*
3014          * generic_commit_write does this for us, but does not update the
3015          * transaction tracking stuff when the size changes.  So, we have
3016          * to do the i_size updates here.
3017          */
3018         if (pos > inode->i_size) {
3019                 struct reiserfs_transaction_handle myth;
3020                 /*
3021                  * If the file have grown beyond the border where it
3022                  * can have a tail, unmark it as needing a tail
3023                  * packing
3024                  */
3025                 if ((have_large_tails(inode->i_sb)
3026                      && inode->i_size > i_block_size(inode) * 4)
3027                     || (have_small_tails(inode->i_sb)
3028                         && inode->i_size > i_block_size(inode)))
3029                         REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
3030
3031                 ret = journal_begin(&myth, inode->i_sb, 1);
3032                 if (ret)
3033                         goto journal_error;
3034
3035                 reiserfs_update_inode_transaction(inode);
3036                 inode->i_size = pos;
3037                 /*
3038                  * this will just nest into our transaction.  It's important
3039                  * to use mark_inode_dirty so the inode gets pushed around
3040                  * on the dirty lists, and so that O_SYNC works as expected
3041                  */
3042                 mark_inode_dirty(inode);
3043                 reiserfs_update_sd(&myth, inode);
3044                 update_sd = 1;
3045                 ret = journal_end(&myth);
3046                 if (ret)
3047                         goto journal_error;
3048         }
3049         if (th) {
3050                 if (!update_sd)
3051                         mark_inode_dirty(inode);
3052                 ret = reiserfs_end_persistent_transaction(th);
3053                 if (ret)
3054                         goto out;
3055         }
3056
3057 out:
3058         return ret;
3059
3060 journal_error:
3061         if (th) {
3062                 if (!update_sd)
3063                         reiserfs_update_sd(th, inode);
3064                 ret = reiserfs_end_persistent_transaction(th);
3065         }
3066
3067         return ret;
3068 }
3069
3070 void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
3071 {
3072         if (reiserfs_attrs(inode->i_sb)) {
3073                 if (sd_attrs & REISERFS_SYNC_FL)
3074                         inode->i_flags |= S_SYNC;
3075                 else
3076                         inode->i_flags &= ~S_SYNC;
3077                 if (sd_attrs & REISERFS_IMMUTABLE_FL)
3078                         inode->i_flags |= S_IMMUTABLE;
3079                 else
3080                         inode->i_flags &= ~S_IMMUTABLE;
3081                 if (sd_attrs & REISERFS_APPEND_FL)
3082                         inode->i_flags |= S_APPEND;
3083                 else
3084                         inode->i_flags &= ~S_APPEND;
3085                 if (sd_attrs & REISERFS_NOATIME_FL)
3086                         inode->i_flags |= S_NOATIME;
3087                 else
3088                         inode->i_flags &= ~S_NOATIME;
3089                 if (sd_attrs & REISERFS_NOTAIL_FL)
3090                         REISERFS_I(inode)->i_flags |= i_nopack_mask;
3091                 else
3092                         REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
3093         }
3094 }
3095
3096 void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
3097 {
3098         if (reiserfs_attrs(inode->i_sb)) {
3099                 if (inode->i_flags & S_IMMUTABLE)
3100                         *sd_attrs |= REISERFS_IMMUTABLE_FL;
3101                 else
3102                         *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
3103                 if (inode->i_flags & S_SYNC)
3104                         *sd_attrs |= REISERFS_SYNC_FL;
3105                 else
3106                         *sd_attrs &= ~REISERFS_SYNC_FL;
3107                 if (inode->i_flags & S_NOATIME)
3108                         *sd_attrs |= REISERFS_NOATIME_FL;
3109                 else
3110                         *sd_attrs &= ~REISERFS_NOATIME_FL;
3111                 if (REISERFS_I(inode)->i_flags & i_nopack_mask)
3112                         *sd_attrs |= REISERFS_NOTAIL_FL;
3113                 else
3114                         *sd_attrs &= ~REISERFS_NOTAIL_FL;
3115         }
3116 }
3117
3118 /*
3119  * decide if this buffer needs to stay around for data logging or ordered
3120  * write purposes
3121  */
3122 static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
3123 {
3124         int ret = 1;
3125         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3126
3127         lock_buffer(bh);
3128         spin_lock(&j->j_dirty_buffers_lock);
3129         if (!buffer_mapped(bh)) {
3130                 goto free_jh;
3131         }
3132         /*
3133          * the page is locked, and the only places that log a data buffer
3134          * also lock the page.
3135          */
3136         if (reiserfs_file_data_log(inode)) {
3137                 /*
3138                  * very conservative, leave the buffer pinned if
3139                  * anyone might need it.
3140                  */
3141                 if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
3142                         ret = 0;
3143                 }
3144         } else  if (buffer_dirty(bh)) {
3145                 struct reiserfs_journal_list *jl;
3146                 struct reiserfs_jh *jh = bh->b_private;
3147
3148                 /*
3149                  * why is this safe?
3150                  * reiserfs_setattr updates i_size in the on disk
3151                  * stat data before allowing vmtruncate to be called.
3152                  *
3153                  * If buffer was put onto the ordered list for this
3154                  * transaction, we know for sure either this transaction
3155                  * or an older one already has updated i_size on disk,
3156                  * and this ordered data won't be referenced in the file
3157                  * if we crash.
3158                  *
3159                  * if the buffer was put onto the ordered list for an older
3160                  * transaction, we need to leave it around
3161                  */
3162                 if (jh && (jl = jh->jl)
3163                     && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
3164                         ret = 0;
3165         }
3166 free_jh:
3167         if (ret && bh->b_private) {
3168                 reiserfs_free_jh(bh);
3169         }
3170         spin_unlock(&j->j_dirty_buffers_lock);
3171         unlock_buffer(bh);
3172         return ret;
3173 }
3174
3175 /* clm -- taken from fs/buffer.c:block_invalidate_page */
3176 static void reiserfs_invalidatepage(struct page *page, unsigned int offset,
3177                                     unsigned int length)
3178 {
3179         struct buffer_head *head, *bh, *next;
3180         struct inode *inode = page->mapping->host;
3181         unsigned int curr_off = 0;
3182         unsigned int stop = offset + length;
3183         int partial_page = (offset || length < PAGE_CACHE_SIZE);
3184         int ret = 1;
3185
3186         BUG_ON(!PageLocked(page));
3187
3188         if (!partial_page)
3189                 ClearPageChecked(page);
3190
3191         if (!page_has_buffers(page))
3192                 goto out;
3193
3194         head = page_buffers(page);
3195         bh = head;
3196         do {
3197                 unsigned int next_off = curr_off + bh->b_size;
3198                 next = bh->b_this_page;
3199
3200                 if (next_off > stop)
3201                         goto out;
3202
3203                 /*
3204                  * is this block fully invalidated?
3205                  */
3206                 if (offset <= curr_off) {
3207                         if (invalidatepage_can_drop(inode, bh))
3208                                 reiserfs_unmap_buffer(bh);
3209                         else
3210                                 ret = 0;
3211                 }
3212                 curr_off = next_off;
3213                 bh = next;
3214         } while (bh != head);
3215
3216         /*
3217          * We release buffers only if the entire page is being invalidated.
3218          * The get_block cached value has been unconditionally invalidated,
3219          * so real IO is not possible anymore.
3220          */
3221         if (!partial_page && ret) {
3222                 ret = try_to_release_page(page, 0);
3223                 /* maybe should BUG_ON(!ret); - neilb */
3224         }
3225 out:
3226         return;
3227 }
3228
3229 static int reiserfs_set_page_dirty(struct page *page)
3230 {
3231         struct inode *inode = page->mapping->host;
3232         if (reiserfs_file_data_log(inode)) {
3233                 SetPageChecked(page);
3234                 return __set_page_dirty_nobuffers(page);
3235         }
3236         return __set_page_dirty_buffers(page);
3237 }
3238
3239 /*
3240  * Returns 1 if the page's buffers were dropped.  The page is locked.
3241  *
3242  * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
3243  * in the buffers at page_buffers(page).
3244  *
3245  * even in -o notail mode, we can't be sure an old mount without -o notail
3246  * didn't create files with tails.
3247  */
3248 static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
3249 {
3250         struct inode *inode = page->mapping->host;
3251         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3252         struct buffer_head *head;
3253         struct buffer_head *bh;
3254         int ret = 1;
3255
3256         WARN_ON(PageChecked(page));
3257         spin_lock(&j->j_dirty_buffers_lock);
3258         head = page_buffers(page);
3259         bh = head;
3260         do {
3261                 if (bh->b_private) {
3262                         if (!buffer_dirty(bh) && !buffer_locked(bh)) {
3263                                 reiserfs_free_jh(bh);
3264                         } else {
3265                                 ret = 0;
3266                                 break;
3267                         }
3268                 }
3269                 bh = bh->b_this_page;
3270         } while (bh != head);
3271         if (ret)
3272                 ret = try_to_free_buffers(page);
3273         spin_unlock(&j->j_dirty_buffers_lock);
3274         return ret;
3275 }
3276
3277 /*
3278  * We thank Mingming Cao for helping us understand in great detail what
3279  * to do in this section of the code.
3280  */
3281 static ssize_t reiserfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
3282                                   loff_t offset)
3283 {
3284         struct file *file = iocb->ki_filp;
3285         struct inode *inode = file->f_mapping->host;
3286         size_t count = iov_iter_count(iter);
3287         ssize_t ret;
3288
3289         ret = blockdev_direct_IO(iocb, inode, iter, offset,
3290                                  reiserfs_get_blocks_direct_io);
3291
3292         /*
3293          * In case of error extending write may have instantiated a few
3294          * blocks outside i_size. Trim these off again.
3295          */
3296         if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
3297                 loff_t isize = i_size_read(inode);
3298                 loff_t end = offset + count;
3299
3300                 if ((end > isize) && inode_newsize_ok(inode, isize) == 0) {
3301                         truncate_setsize(inode, isize);
3302                         reiserfs_vfs_truncate_file(inode);
3303                 }
3304         }
3305
3306         return ret;
3307 }
3308
3309 int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
3310 {
3311         struct inode *inode = d_inode(dentry);
3312         unsigned int ia_valid;
3313         int error;
3314
3315         error = inode_change_ok(inode, attr);
3316         if (error)
3317                 return error;
3318
3319         /* must be turned off for recursive notify_change calls */
3320         ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
3321
3322         if (is_quota_modification(inode, attr))
3323                 dquot_initialize(inode);
3324         reiserfs_write_lock(inode->i_sb);
3325         if (attr->ia_valid & ATTR_SIZE) {
3326                 /*
3327                  * version 2 items will be caught by the s_maxbytes check
3328                  * done for us in vmtruncate
3329                  */
3330                 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
3331                     attr->ia_size > MAX_NON_LFS) {
3332                         reiserfs_write_unlock(inode->i_sb);
3333                         error = -EFBIG;
3334                         goto out;
3335                 }
3336
3337                 inode_dio_wait(inode);
3338
3339                 /* fill in hole pointers in the expanding truncate case. */
3340                 if (attr->ia_size > inode->i_size) {
3341                         error = generic_cont_expand_simple(inode, attr->ia_size);
3342                         if (REISERFS_I(inode)->i_prealloc_count > 0) {
3343                                 int err;
3344                                 struct reiserfs_transaction_handle th;
3345                                 /* we're changing at most 2 bitmaps, inode + super */
3346                                 err = journal_begin(&th, inode->i_sb, 4);
3347                                 if (!err) {
3348                                         reiserfs_discard_prealloc(&th, inode);
3349                                         err = journal_end(&th);
3350                                 }
3351                                 if (err)
3352                                         error = err;
3353                         }
3354                         if (error) {
3355                                 reiserfs_write_unlock(inode->i_sb);
3356                                 goto out;
3357                         }
3358                         /*
3359                          * file size is changed, ctime and mtime are
3360                          * to be updated
3361                          */
3362                         attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
3363                 }
3364         }
3365         reiserfs_write_unlock(inode->i_sb);
3366
3367         if ((((attr->ia_valid & ATTR_UID) && (from_kuid(&init_user_ns, attr->ia_uid) & ~0xffff)) ||
3368              ((attr->ia_valid & ATTR_GID) && (from_kgid(&init_user_ns, attr->ia_gid) & ~0xffff))) &&
3369             (get_inode_sd_version(inode) == STAT_DATA_V1)) {
3370                 /* stat data of format v3.5 has 16 bit uid and gid */
3371                 error = -EINVAL;
3372                 goto out;
3373         }
3374
3375         if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
3376             (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
3377                 struct reiserfs_transaction_handle th;
3378                 int jbegin_count =
3379                     2 *
3380                     (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
3381                      REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
3382                     2;
3383
3384                 error = reiserfs_chown_xattrs(inode, attr);
3385
3386                 if (error)
3387                         return error;
3388
3389                 /*
3390                  * (user+group)*(old+new) structure - we count quota
3391                  * info and , inode write (sb, inode)
3392                  */
3393                 reiserfs_write_lock(inode->i_sb);
3394                 error = journal_begin(&th, inode->i_sb, jbegin_count);
3395                 reiserfs_write_unlock(inode->i_sb);
3396                 if (error)
3397                         goto out;
3398                 error = dquot_transfer(inode, attr);
3399                 reiserfs_write_lock(inode->i_sb);
3400                 if (error) {
3401                         journal_end(&th);
3402                         reiserfs_write_unlock(inode->i_sb);
3403                         goto out;
3404                 }
3405
3406                 /*
3407                  * Update corresponding info in inode so that everything
3408                  * is in one transaction
3409                  */
3410                 if (attr->ia_valid & ATTR_UID)
3411                         inode->i_uid = attr->ia_uid;
3412                 if (attr->ia_valid & ATTR_GID)
3413                         inode->i_gid = attr->ia_gid;
3414                 mark_inode_dirty(inode);
3415                 error = journal_end(&th);
3416                 reiserfs_write_unlock(inode->i_sb);
3417                 if (error)
3418                         goto out;
3419         }
3420
3421         if ((attr->ia_valid & ATTR_SIZE) &&
3422             attr->ia_size != i_size_read(inode)) {
3423                 error = inode_newsize_ok(inode, attr->ia_size);
3424                 if (!error) {
3425                         /*
3426                          * Could race against reiserfs_file_release
3427                          * if called from NFS, so take tailpack mutex.
3428                          */
3429                         mutex_lock(&REISERFS_I(inode)->tailpack);
3430                         truncate_setsize(inode, attr->ia_size);
3431                         reiserfs_truncate_file(inode, 1);
3432                         mutex_unlock(&REISERFS_I(inode)->tailpack);
3433                 }
3434         }
3435
3436         if (!error) {
3437                 setattr_copy(inode, attr);
3438                 mark_inode_dirty(inode);
3439         }
3440
3441         if (!error && reiserfs_posixacl(inode->i_sb)) {
3442                 if (attr->ia_valid & ATTR_MODE)
3443                         error = reiserfs_acl_chmod(inode);
3444         }
3445
3446 out:
3447         return error;
3448 }
3449
3450 const struct address_space_operations reiserfs_address_space_operations = {
3451         .writepage = reiserfs_writepage,
3452         .readpage = reiserfs_readpage,
3453         .readpages = reiserfs_readpages,
3454         .releasepage = reiserfs_releasepage,
3455         .invalidatepage = reiserfs_invalidatepage,
3456         .write_begin = reiserfs_write_begin,
3457         .write_end = reiserfs_write_end,
3458         .bmap = reiserfs_aop_bmap,
3459         .direct_IO = reiserfs_direct_IO,
3460         .set_page_dirty = reiserfs_set_page_dirty,
3461 };