fs/reiserfs/inode.c

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