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