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