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TOMOYO Linux Cross Reference
Linux/fs/reiserfs/inode.c

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

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