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