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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 = kzalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_NOFS);
1048                                 if (!un) {
1049                                         un = &unf_single;
1050                                         blocks_needed = 1;
1051                                         max_to_insert = 0;
1052                                 }
1053                         }
1054                         if (blocks_needed <= max_to_insert) {
1055                                 /*
1056                                  * we are going to add target block to
1057                                  * the file. Use allocated block for that
1058                                  */
1059                                 un[blocks_needed - 1] =
1060                                     cpu_to_le32(allocated_block_nr);
1061                                 set_block_dev_mapped(bh_result,
1062                                                      allocated_block_nr, inode);
1063                                 set_buffer_new(bh_result);
1064                                 done = 1;
1065                         } else {
1066                                 /* paste hole to the indirect item */
1067                                 /*
1068                                  * If kmalloc failed, max_to_insert becomes
1069                                  * zero and it means we only have space for
1070                                  * one block
1071                                  */
1072                                 blocks_needed =
1073                                     max_to_insert ? max_to_insert : 1;
1074                         }
1075                         retval =
1076                             reiserfs_paste_into_item(th, &path, &tmp_key, inode,
1077                                                      (char *)un,
1078                                                      UNFM_P_SIZE *
1079                                                      blocks_needed);
1080 
1081                         if (blocks_needed != 1)
1082                                 kfree(un);
1083 
1084                         if (retval) {
1085                                 reiserfs_free_block(th, inode,
1086                                                     allocated_block_nr, 1);
1087                                 goto failure;
1088                         }
1089                         if (!done) {
1090                                 /*
1091                                  * We need to mark new file size in case
1092                                  * this function will be interrupted/aborted
1093                                  * later on. And we may do this only for
1094                                  * holes.
1095                                  */
1096                                 inode->i_size +=
1097                                     inode->i_sb->s_blocksize * blocks_needed;
1098                         }
1099                 }
1100 
1101                 if (done == 1)
1102                         break;
1103 
1104                 /*
1105                  * this loop could log more blocks than we had originally
1106                  * asked for.  So, we have to allow the transaction to end
1107                  * if it is too big or too full.  Update the inode so things
1108                  * are consistent if we crash before the function returns
1109                  * release the path so that anybody waiting on the path before
1110                  * ending their transaction will be able to continue.
1111                  */
1112                 if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
1113                         retval = restart_transaction(th, inode, &path);
1114                         if (retval)
1115                                 goto failure;
1116                 }
1117                 /*
1118                  * inserting indirect pointers for a hole can take a
1119                  * long time.  reschedule if needed and also release the write
1120                  * lock for others.
1121                  */
1122                 reiserfs_cond_resched(inode->i_sb);
1123 
1124                 retval = search_for_position_by_key(inode->i_sb, &key, &path);
1125                 if (retval == IO_ERROR) {
1126                         retval = -EIO;
1127                         goto failure;
1128                 }
1129                 if (retval == POSITION_FOUND) {
1130                         reiserfs_warning(inode->i_sb, "vs-825",
1131                                          "%K should not be found", &key);
1132                         retval = -EEXIST;
1133                         if (allocated_block_nr)
1134                                 reiserfs_free_block(th, inode,
1135                                                     allocated_block_nr, 1);
1136                         pathrelse(&path);
1137                         goto failure;
1138                 }
1139                 bh = get_last_bh(&path);
1140                 ih = tp_item_head(&path);
1141                 item = tp_item_body(&path);
1142                 pos_in_item = path.pos_in_item;
1143         } while (1);
1144 
1145         retval = 0;
1146 
1147 failure:
1148         if (th && (!dangle || (retval && !th->t_trans_id))) {
1149                 int err;
1150                 if (th->t_trans_id)
1151                         reiserfs_update_sd(th, inode);
1152                 err = reiserfs_end_persistent_transaction(th);
1153                 if (err)
1154                         retval = err;
1155         }
1156 
1157         reiserfs_write_unlock(inode->i_sb);
1158         reiserfs_check_path(&path);
1159         return retval;
1160 }
1161 
1162 static int
1163 reiserfs_readpages(struct file *file, struct address_space *mapping,
1164                    struct list_head *pages, unsigned nr_pages)
1165 {
1166         return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
1167 }
1168 
1169 /*
1170  * Compute real number of used bytes by file
1171  * Following three functions can go away when we'll have enough space in
1172  * stat item
1173  */
1174 static int real_space_diff(struct inode *inode, int sd_size)
1175 {
1176         int bytes;
1177         loff_t blocksize = inode->i_sb->s_blocksize;
1178 
1179         if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
1180                 return sd_size;
1181 
1182         /*
1183          * End of file is also in full block with indirect reference, so round
1184          * up to the next block.
1185          *
1186          * there is just no way to know if the tail is actually packed
1187          * on the file, so we have to assume it isn't.  When we pack the
1188          * tail, we add 4 bytes to pretend there really is an unformatted
1189          * node pointer
1190          */
1191         bytes =
1192             ((inode->i_size +
1193               (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE +
1194             sd_size;
1195         return bytes;
1196 }
1197 
1198 static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
1199                                         int sd_size)
1200 {
1201         if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1202                 return inode->i_size +
1203                     (loff_t) (real_space_diff(inode, sd_size));
1204         }
1205         return ((loff_t) real_space_diff(inode, sd_size)) +
1206             (((loff_t) blocks) << 9);
1207 }
1208 
1209 /* Compute number of blocks used by file in ReiserFS counting */
1210 static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
1211 {
1212         loff_t bytes = inode_get_bytes(inode);
1213         loff_t real_space = real_space_diff(inode, sd_size);
1214 
1215         /* keeps fsck and non-quota versions of reiserfs happy */
1216         if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1217                 bytes += (loff_t) 511;
1218         }
1219 
1220         /*
1221          * files from before the quota patch might i_blocks such that
1222          * bytes < real_space.  Deal with that here to prevent it from
1223          * going negative.
1224          */
1225         if (bytes < real_space)
1226                 return 0;
1227         return (bytes - real_space) >> 9;
1228 }
1229 
1230 /*
1231  * BAD: new directories have stat data of new type and all other items
1232  * of old type. Version stored in the inode says about body items, so
1233  * in update_stat_data we can not rely on inode, but have to check
1234  * item version directly
1235  */
1236 
1237 /* called by read_locked_inode */
1238 static void init_inode(struct inode *inode, struct treepath *path)
1239 {
1240         struct buffer_head *bh;
1241         struct item_head *ih;
1242         __u32 rdev;
1243 
1244         bh = PATH_PLAST_BUFFER(path);
1245         ih = tp_item_head(path);
1246 
1247         copy_key(INODE_PKEY(inode), &ih->ih_key);
1248 
1249         INIT_LIST_HEAD(&REISERFS_I(inode)->i_prealloc_list);
1250         REISERFS_I(inode)->i_flags = 0;
1251         REISERFS_I(inode)->i_prealloc_block = 0;
1252         REISERFS_I(inode)->i_prealloc_count = 0;
1253         REISERFS_I(inode)->i_trans_id = 0;
1254         REISERFS_I(inode)->i_jl = NULL;
1255         reiserfs_init_xattr_rwsem(inode);
1256 
1257         if (stat_data_v1(ih)) {
1258                 struct stat_data_v1 *sd =
1259                     (struct stat_data_v1 *)ih_item_body(bh, ih);
1260                 unsigned long blocks;
1261 
1262                 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1263                 set_inode_sd_version(inode, STAT_DATA_V1);
1264                 inode->i_mode = sd_v1_mode(sd);
1265                 set_nlink(inode, sd_v1_nlink(sd));
1266                 i_uid_write(inode, sd_v1_uid(sd));
1267                 i_gid_write(inode, sd_v1_gid(sd));
1268                 inode->i_size = sd_v1_size(sd);
1269                 inode->i_atime.tv_sec = sd_v1_atime(sd);
1270                 inode->i_mtime.tv_sec = sd_v1_mtime(sd);
1271                 inode->i_ctime.tv_sec = sd_v1_ctime(sd);
1272                 inode->i_atime.tv_nsec = 0;
1273                 inode->i_ctime.tv_nsec = 0;
1274                 inode->i_mtime.tv_nsec = 0;
1275 
1276                 inode->i_blocks = sd_v1_blocks(sd);
1277                 inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1278                 blocks = (inode->i_size + 511) >> 9;
1279                 blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
1280 
1281                 /*
1282                  * there was a bug in <=3.5.23 when i_blocks could take
1283                  * negative values. Starting from 3.5.17 this value could
1284                  * even be stored in stat data. For such files we set
1285                  * i_blocks based on file size. Just 2 notes: this can be
1286                  * wrong for sparse files. On-disk value will be only
1287                  * updated if file's inode will ever change
1288                  */
1289                 if (inode->i_blocks > blocks) {
1290                         inode->i_blocks = blocks;
1291                 }
1292 
1293                 rdev = sd_v1_rdev(sd);
1294                 REISERFS_I(inode)->i_first_direct_byte =
1295                     sd_v1_first_direct_byte(sd);
1296 
1297                 /*
1298                  * an early bug in the quota code can give us an odd
1299                  * number for the block count.  This is incorrect, fix it here.
1300                  */
1301                 if (inode->i_blocks & 1) {
1302                         inode->i_blocks++;
1303                 }
1304                 inode_set_bytes(inode,
1305                                 to_real_used_space(inode, inode->i_blocks,
1306                                                    SD_V1_SIZE));
1307                 /*
1308                  * nopack is initially zero for v1 objects. For v2 objects,
1309                  * nopack is initialised from sd_attrs
1310                  */
1311                 REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
1312         } else {
1313                 /*
1314                  * new stat data found, but object may have old items
1315                  * (directories and symlinks)
1316                  */
1317                 struct stat_data *sd = (struct stat_data *)ih_item_body(bh, ih);
1318 
1319                 inode->i_mode = sd_v2_mode(sd);
1320                 set_nlink(inode, sd_v2_nlink(sd));
1321                 i_uid_write(inode, sd_v2_uid(sd));
1322                 inode->i_size = sd_v2_size(sd);
1323                 i_gid_write(inode, sd_v2_gid(sd));
1324                 inode->i_mtime.tv_sec = sd_v2_mtime(sd);
1325                 inode->i_atime.tv_sec = sd_v2_atime(sd);
1326                 inode->i_ctime.tv_sec = sd_v2_ctime(sd);
1327                 inode->i_ctime.tv_nsec = 0;
1328                 inode->i_mtime.tv_nsec = 0;
1329                 inode->i_atime.tv_nsec = 0;
1330                 inode->i_blocks = sd_v2_blocks(sd);
1331                 rdev = sd_v2_rdev(sd);
1332                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1333                         inode->i_generation =
1334                             le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1335                 else
1336                         inode->i_generation = sd_v2_generation(sd);
1337 
1338                 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1339                         set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1340                 else
1341                         set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1342                 REISERFS_I(inode)->i_first_direct_byte = 0;
1343                 set_inode_sd_version(inode, STAT_DATA_V2);
1344                 inode_set_bytes(inode,
1345                                 to_real_used_space(inode, inode->i_blocks,
1346                                                    SD_V2_SIZE));
1347                 /*
1348                  * read persistent inode attributes from sd and initialise
1349                  * generic inode flags from them
1350                  */
1351                 REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
1352                 sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
1353         }
1354 
1355         pathrelse(path);
1356         if (S_ISREG(inode->i_mode)) {
1357                 inode->i_op = &reiserfs_file_inode_operations;
1358                 inode->i_fop = &reiserfs_file_operations;
1359                 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1360         } else if (S_ISDIR(inode->i_mode)) {
1361                 inode->i_op = &reiserfs_dir_inode_operations;
1362                 inode->i_fop = &reiserfs_dir_operations;
1363         } else if (S_ISLNK(inode->i_mode)) {
1364                 inode->i_op = &reiserfs_symlink_inode_operations;
1365                 inode_nohighmem(inode);
1366                 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1367         } else {
1368                 inode->i_blocks = 0;
1369                 inode->i_op = &reiserfs_special_inode_operations;
1370                 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
1371         }
1372 }
1373 
1374 /* update new stat data with inode fields */
1375 static void inode2sd(void *sd, struct inode *inode, loff_t size)
1376 {
1377         struct stat_data *sd_v2 = (struct stat_data *)sd;
1378         __u16 flags;
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         flags = REISERFS_I(inode)->i_attrs;
1394         i_attrs_to_sd_attrs(inode, &flags);
1395         set_sd_v2_attrs(sd_v2, flags);
1396 }
1397 
1398 /* used to copy inode's fields to old stat data */
1399 static void inode2sd_v1(void *sd, struct inode *inode, loff_t size)
1400 {
1401         struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd;
1402 
1403         set_sd_v1_mode(sd_v1, inode->i_mode);
1404         set_sd_v1_uid(sd_v1, i_uid_read(inode));
1405         set_sd_v1_gid(sd_v1, i_gid_read(inode));
1406         set_sd_v1_nlink(sd_v1, inode->i_nlink);
1407         set_sd_v1_size(sd_v1, size);
1408         set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec);
1409         set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec);
1410         set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec);
1411 
1412         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1413                 set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
1414         else
1415                 set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
1416 
1417         /* Sigh. i_first_direct_byte is back */
1418         set_sd_v1_first_direct_byte(sd_v1,
1419                                     REISERFS_I(inode)->i_first_direct_byte);
1420 }
1421 
1422 /*
1423  * NOTE, you must prepare the buffer head before sending it here,
1424  * and then log it after the call
1425  */
1426 static void update_stat_data(struct treepath *path, struct inode *inode,
1427                              loff_t size)
1428 {
1429         struct buffer_head *bh;
1430         struct item_head *ih;
1431 
1432         bh = PATH_PLAST_BUFFER(path);
1433         ih = tp_item_head(path);
1434 
1435         if (!is_statdata_le_ih(ih))
1436                 reiserfs_panic(inode->i_sb, "vs-13065", "key %k, found item %h",
1437                                INODE_PKEY(inode), ih);
1438 
1439         /* path points to old stat data */
1440         if (stat_data_v1(ih)) {
1441                 inode2sd_v1(ih_item_body(bh, ih), inode, size);
1442         } else {
1443                 inode2sd(ih_item_body(bh, ih), inode, size);
1444         }
1445 
1446         return;
1447 }
1448 
1449 void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
1450                              struct inode *inode, loff_t size)
1451 {
1452         struct cpu_key key;
1453         INITIALIZE_PATH(path);
1454         struct buffer_head *bh;
1455         int fs_gen;
1456         struct item_head *ih, tmp_ih;
1457         int retval;
1458 
1459         BUG_ON(!th->t_trans_id);
1460 
1461         /* key type is unimportant */
1462         make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3);
1463 
1464         for (;;) {
1465                 int pos;
1466                 /* look for the object's stat data */
1467                 retval = search_item(inode->i_sb, &key, &path);
1468                 if (retval == IO_ERROR) {
1469                         reiserfs_error(inode->i_sb, "vs-13050",
1470                                        "i/o failure occurred trying to "
1471                                        "update %K stat data", &key);
1472                         return;
1473                 }
1474                 if (retval == ITEM_NOT_FOUND) {
1475                         pos = PATH_LAST_POSITION(&path);
1476                         pathrelse(&path);
1477                         if (inode->i_nlink == 0) {
1478                                 /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */
1479                                 return;
1480                         }
1481                         reiserfs_warning(inode->i_sb, "vs-13060",
1482                                          "stat data of object %k (nlink == %d) "
1483                                          "not found (pos %d)",
1484                                          INODE_PKEY(inode), inode->i_nlink,
1485                                          pos);
1486                         reiserfs_check_path(&path);
1487                         return;
1488                 }
1489 
1490                 /*
1491                  * sigh, prepare_for_journal might schedule.  When it
1492                  * schedules the FS might change.  We have to detect that,
1493                  * and loop back to the search if the stat data item has moved
1494                  */
1495                 bh = get_last_bh(&path);
1496                 ih = tp_item_head(&path);
1497                 copy_item_head(&tmp_ih, ih);
1498                 fs_gen = get_generation(inode->i_sb);
1499                 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
1500 
1501                 /* Stat_data item has been moved after scheduling. */
1502                 if (fs_changed(fs_gen, inode->i_sb)
1503                     && item_moved(&tmp_ih, &path)) {
1504                         reiserfs_restore_prepared_buffer(inode->i_sb, bh);
1505                         continue;
1506                 }
1507                 break;
1508         }
1509         update_stat_data(&path, inode, size);
1510         journal_mark_dirty(th, bh);
1511         pathrelse(&path);
1512         return;
1513 }
1514 
1515 /*
1516  * reiserfs_read_locked_inode is called to read the inode off disk, and it
1517  * does a make_bad_inode when things go wrong.  But, we need to make sure
1518  * and clear the key in the private portion of the inode, otherwise a
1519  * corresponding iput might try to delete whatever object the inode last
1520  * represented.
1521  */
1522 static void reiserfs_make_bad_inode(struct inode *inode)
1523 {
1524         memset(INODE_PKEY(inode), 0, KEY_SIZE);
1525         make_bad_inode(inode);
1526 }
1527 
1528 /*
1529  * initially this function was derived from minix or ext2's analog and
1530  * evolved as the prototype did
1531  */
1532 int reiserfs_init_locked_inode(struct inode *inode, void *p)
1533 {
1534         struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p;
1535         inode->i_ino = args->objectid;
1536         INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
1537         return 0;
1538 }
1539 
1540 /*
1541  * looks for stat data in the tree, and fills up the fields of in-core
1542  * inode stat data fields
1543  */
1544 void reiserfs_read_locked_inode(struct inode *inode,
1545                                 struct reiserfs_iget_args *args)
1546 {
1547         INITIALIZE_PATH(path_to_sd);
1548         struct cpu_key key;
1549         unsigned long dirino;
1550         int retval;
1551 
1552         dirino = args->dirid;
1553 
1554         /*
1555          * set version 1, version 2 could be used too, because stat data
1556          * key is the same in both versions
1557          */
1558         key.version = KEY_FORMAT_3_5;
1559         key.on_disk_key.k_dir_id = dirino;
1560         key.on_disk_key.k_objectid = inode->i_ino;
1561         key.on_disk_key.k_offset = 0;
1562         key.on_disk_key.k_type = 0;
1563 
1564         /* look for the object's stat data */
1565         retval = search_item(inode->i_sb, &key, &path_to_sd);
1566         if (retval == IO_ERROR) {
1567                 reiserfs_error(inode->i_sb, "vs-13070",
1568                                "i/o failure occurred trying to find "
1569                                "stat data of %K", &key);
1570                 reiserfs_make_bad_inode(inode);
1571                 return;
1572         }
1573 
1574         /* a stale NFS handle can trigger this without it being an error */
1575         if (retval != ITEM_FOUND) {
1576                 pathrelse(&path_to_sd);
1577                 reiserfs_make_bad_inode(inode);
1578                 clear_nlink(inode);
1579                 return;
1580         }
1581 
1582         init_inode(inode, &path_to_sd);
1583 
1584         /*
1585          * It is possible that knfsd is trying to access inode of a file
1586          * that is being removed from the disk by some other thread. As we
1587          * update sd on unlink all that is required is to check for nlink
1588          * here. This bug was first found by Sizif when debugging
1589          * SquidNG/Butterfly, forgotten, and found again after Philippe
1590          * Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
1591 
1592          * More logical fix would require changes in fs/inode.c:iput() to
1593          * remove inode from hash-table _after_ fs cleaned disk stuff up and
1594          * in iget() to return NULL if I_FREEING inode is found in
1595          * hash-table.
1596          */
1597 
1598         /*
1599          * Currently there is one place where it's ok to meet inode with
1600          * nlink==0: processing of open-unlinked and half-truncated files
1601          * during mount (fs/reiserfs/super.c:finish_unfinished()).
1602          */
1603         if ((inode->i_nlink == 0) &&
1604             !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
1605                 reiserfs_warning(inode->i_sb, "vs-13075",
1606                                  "dead inode read from disk %K. "
1607                                  "This is likely to be race with knfsd. Ignore",
1608                                  &key);
1609                 reiserfs_make_bad_inode(inode);
1610         }
1611 
1612         /* init inode should be relsing */
1613         reiserfs_check_path(&path_to_sd);
1614 
1615         /*
1616          * Stat data v1 doesn't support ACLs.
1617          */
1618         if (get_inode_sd_version(inode) == STAT_DATA_V1)
1619                 cache_no_acl(inode);
1620 }
1621 
1622 /*
1623  * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
1624  *
1625  * @inode:    inode from hash table to check
1626  * @opaque:   "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
1627  *
1628  * This function is called by iget5_locked() to distinguish reiserfs inodes
1629  * having the same inode numbers. Such inodes can only exist due to some
1630  * error condition. One of them should be bad. Inodes with identical
1631  * inode numbers (objectids) are distinguished by parent directory ids.
1632  *
1633  */
1634 int reiserfs_find_actor(struct inode *inode, void *opaque)
1635 {
1636         struct reiserfs_iget_args *args;
1637 
1638         args = opaque;
1639         /* args is already in CPU order */
1640         return (inode->i_ino == args->objectid) &&
1641             (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
1642 }
1643 
1644 struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
1645 {
1646         struct inode *inode;
1647         struct reiserfs_iget_args args;
1648         int depth;
1649 
1650         args.objectid = key->on_disk_key.k_objectid;
1651         args.dirid = key->on_disk_key.k_dir_id;
1652         depth = reiserfs_write_unlock_nested(s);
1653         inode = iget5_locked(s, key->on_disk_key.k_objectid,
1654                              reiserfs_find_actor, reiserfs_init_locked_inode,
1655                              (void *)(&args));
1656         reiserfs_write_lock_nested(s, depth);
1657         if (!inode)
1658                 return ERR_PTR(-ENOMEM);
1659 
1660         if (inode->i_state & I_NEW) {
1661                 reiserfs_read_locked_inode(inode, &args);
1662                 unlock_new_inode(inode);
1663         }
1664 
1665         if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
1666                 /* either due to i/o error or a stale NFS handle */
1667                 iput(inode);
1668                 inode = NULL;
1669         }
1670         return inode;
1671 }
1672 
1673 static struct dentry *reiserfs_get_dentry(struct super_block *sb,
1674         u32 objectid, u32 dir_id, u32 generation)
1675 
1676 {
1677         struct cpu_key key;
1678         struct inode *inode;
1679 
1680         key.on_disk_key.k_objectid = objectid;
1681         key.on_disk_key.k_dir_id = dir_id;
1682         reiserfs_write_lock(sb);
1683         inode = reiserfs_iget(sb, &key);
1684         if (inode && !IS_ERR(inode) && generation != 0 &&
1685             generation != inode->i_generation) {
1686                 iput(inode);
1687                 inode = NULL;
1688         }
1689         reiserfs_write_unlock(sb);
1690 
1691         return d_obtain_alias(inode);
1692 }
1693 
1694 struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1695                 int fh_len, int fh_type)
1696 {
1697         /*
1698          * fhtype happens to reflect the number of u32s encoded.
1699          * due to a bug in earlier code, fhtype might indicate there
1700          * are more u32s then actually fitted.
1701          * so if fhtype seems to be more than len, reduce fhtype.
1702          * Valid types are:
1703          *   2 - objectid + dir_id - legacy support
1704          *   3 - objectid + dir_id + generation
1705          *   4 - objectid + dir_id + objectid and dirid of parent - legacy
1706          *   5 - objectid + dir_id + generation + objectid and dirid of parent
1707          *   6 - as above plus generation of directory
1708          * 6 does not fit in NFSv2 handles
1709          */
1710         if (fh_type > fh_len) {
1711                 if (fh_type != 6 || fh_len != 5)
1712                         reiserfs_warning(sb, "reiserfs-13077",
1713                                 "nfsd/reiserfs, fhtype=%d, len=%d - odd",
1714                                 fh_type, fh_len);
1715                 fh_type = fh_len;
1716         }
1717         if (fh_len < 2)
1718                 return NULL;
1719 
1720         return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
1721                 (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
1722 }
1723 
1724 struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1725                 int fh_len, int fh_type)
1726 {
1727         if (fh_type > fh_len)
1728                 fh_type = fh_len;
1729         if (fh_type < 4)
1730                 return NULL;
1731 
1732         return reiserfs_get_dentry(sb,
1733                 (fh_type >= 5) ? fid->raw[3] : fid->raw[2],
1734                 (fh_type >= 5) ? fid->raw[4] : fid->raw[3],
1735                 (fh_type == 6) ? fid->raw[5] : 0);
1736 }
1737 
1738 int reiserfs_encode_fh(struct inode *inode, __u32 * data, int *lenp,
1739                        struct inode *parent)
1740 {
1741         int maxlen = *lenp;
1742 
1743         if (parent && (maxlen < 5)) {
1744                 *lenp = 5;
1745                 return FILEID_INVALID;
1746         } else if (maxlen < 3) {
1747                 *lenp = 3;
1748                 return FILEID_INVALID;
1749         }
1750 
1751         data[0] = inode->i_ino;
1752         data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1753         data[2] = inode->i_generation;
1754         *lenp = 3;
1755         if (parent) {
1756                 data[3] = parent->i_ino;
1757                 data[4] = le32_to_cpu(INODE_PKEY(parent)->k_dir_id);
1758                 *lenp = 5;
1759                 if (maxlen >= 6) {
1760                         data[5] = parent->i_generation;
1761                         *lenp = 6;
1762                 }
1763         }
1764         return *lenp;
1765 }
1766 
1767 /*
1768  * looks for stat data, then copies fields to it, marks the buffer
1769  * containing stat data as dirty
1770  */
1771 /*
1772  * reiserfs inodes are never really dirty, since the dirty inode call
1773  * always logs them.  This call allows the VFS inode marking routines
1774  * to properly mark inodes for datasync and such, but only actually
1775  * does something when called for a synchronous update.
1776  */
1777 int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1778 {
1779         struct reiserfs_transaction_handle th;
1780         int jbegin_count = 1;
1781 
1782         if (inode->i_sb->s_flags & MS_RDONLY)
1783                 return -EROFS;
1784         /*
1785          * memory pressure can sometimes initiate write_inode calls with
1786          * sync == 1,
1787          * these cases are just when the system needs ram, not when the
1788          * inode needs to reach disk for safety, and they can safely be
1789          * ignored because the altered inode has already been logged.
1790          */
1791         if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) {
1792                 reiserfs_write_lock(inode->i_sb);
1793                 if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
1794                         reiserfs_update_sd(&th, inode);
1795                         journal_end_sync(&th);
1796                 }
1797                 reiserfs_write_unlock(inode->i_sb);
1798         }
1799         return 0;
1800 }
1801 
1802 /*
1803  * stat data of new object is inserted already, this inserts the item
1804  * containing "." and ".." entries
1805  */
1806 static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
1807                                   struct inode *inode,
1808                                   struct item_head *ih, struct treepath *path,
1809                                   struct inode *dir)
1810 {
1811         struct super_block *sb = th->t_super;
1812         char empty_dir[EMPTY_DIR_SIZE];
1813         char *body = empty_dir;
1814         struct cpu_key key;
1815         int retval;
1816 
1817         BUG_ON(!th->t_trans_id);
1818 
1819         _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
1820                       le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
1821                       TYPE_DIRENTRY, 3 /*key length */ );
1822 
1823         /*
1824          * compose item head for new item. Directories consist of items of
1825          * old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
1826          * is done by reiserfs_new_inode
1827          */
1828         if (old_format_only(sb)) {
1829                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1830                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
1831 
1832                 make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
1833                                        ih->ih_key.k_objectid,
1834                                        INODE_PKEY(dir)->k_dir_id,
1835                                        INODE_PKEY(dir)->k_objectid);
1836         } else {
1837                 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1838                                   TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
1839 
1840                 make_empty_dir_item(body, ih->ih_key.k_dir_id,
1841                                     ih->ih_key.k_objectid,
1842                                     INODE_PKEY(dir)->k_dir_id,
1843                                     INODE_PKEY(dir)->k_objectid);
1844         }
1845 
1846         /* look for place in the tree for new item */
1847         retval = search_item(sb, &key, path);
1848         if (retval == IO_ERROR) {
1849                 reiserfs_error(sb, "vs-13080",
1850                                "i/o failure occurred creating new directory");
1851                 return -EIO;
1852         }
1853         if (retval == ITEM_FOUND) {
1854                 pathrelse(path);
1855                 reiserfs_warning(sb, "vs-13070",
1856                                  "object with this key exists (%k)",
1857                                  &(ih->ih_key));
1858                 return -EEXIST;
1859         }
1860 
1861         /* insert item, that is empty directory item */
1862         return reiserfs_insert_item(th, path, &key, ih, inode, body);
1863 }
1864 
1865 /*
1866  * stat data of object has been inserted, this inserts the item
1867  * containing the body of symlink
1868  */
1869 static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th,
1870                                 struct inode *inode,
1871                                 struct item_head *ih,
1872                                 struct treepath *path, const char *symname,
1873                                 int item_len)
1874 {
1875         struct super_block *sb = th->t_super;
1876         struct cpu_key key;
1877         int retval;
1878 
1879         BUG_ON(!th->t_trans_id);
1880 
1881         _make_cpu_key(&key, KEY_FORMAT_3_5,
1882                       le32_to_cpu(ih->ih_key.k_dir_id),
1883                       le32_to_cpu(ih->ih_key.k_objectid),
1884                       1, TYPE_DIRECT, 3 /*key length */ );
1885 
1886         make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
1887                           0 /*free_space */ );
1888 
1889         /* look for place in the tree for new item */
1890         retval = search_item(sb, &key, path);
1891         if (retval == IO_ERROR) {
1892                 reiserfs_error(sb, "vs-13080",
1893                                "i/o failure occurred creating new symlink");
1894                 return -EIO;
1895         }
1896         if (retval == ITEM_FOUND) {
1897                 pathrelse(path);
1898                 reiserfs_warning(sb, "vs-13080",
1899                                  "object with this key exists (%k)",
1900                                  &(ih->ih_key));
1901                 return -EEXIST;
1902         }
1903 
1904         /* insert item, that is body of symlink */
1905         return reiserfs_insert_item(th, path, &key, ih, inode, symname);
1906 }
1907 
1908 /*
1909  * inserts the stat data into the tree, and then calls
1910  * reiserfs_new_directory (to insert ".", ".." item if new object is
1911  * directory) or reiserfs_new_symlink (to insert symlink body if new
1912  * object is symlink) or nothing (if new object is regular file)
1913 
1914  * NOTE! uid and gid must already be set in the inode.  If we return
1915  * non-zero due to an error, we have to drop the quota previously allocated
1916  * for the fresh inode.  This can only be done outside a transaction, so
1917  * if we return non-zero, we also end the transaction.
1918  *
1919  * @th: active transaction handle
1920  * @dir: parent directory for new inode
1921  * @mode: mode of new inode
1922  * @symname: symlink contents if inode is symlink
1923  * @isize: 0 for regular file, EMPTY_DIR_SIZE for dirs, strlen(symname) for
1924  *         symlinks
1925  * @inode: inode to be filled
1926  * @security: optional security context to associate with this inode
1927  */
1928 int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1929                        struct inode *dir, umode_t mode, const char *symname,
1930                        /* 0 for regular, EMTRY_DIR_SIZE for dirs,
1931                           strlen (symname) for symlinks) */
1932                        loff_t i_size, struct dentry *dentry,
1933                        struct inode *inode,
1934                        struct reiserfs_security_handle *security)
1935 {
1936         struct super_block *sb = dir->i_sb;
1937         struct reiserfs_iget_args args;
1938         INITIALIZE_PATH(path_to_key);
1939         struct cpu_key key;
1940         struct item_head ih;
1941         struct stat_data sd;
1942         int retval;
1943         int err;
1944         int depth;
1945 
1946         BUG_ON(!th->t_trans_id);
1947 
1948         depth = reiserfs_write_unlock_nested(sb);
1949         err = dquot_alloc_inode(inode);
1950         reiserfs_write_lock_nested(sb, depth);
1951         if (err)
1952                 goto out_end_trans;
1953         if (!dir->i_nlink) {
1954                 err = -EPERM;
1955                 goto out_bad_inode;
1956         }
1957 
1958         /* item head of new item */
1959         ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
1960         ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
1961         if (!ih.ih_key.k_objectid) {
1962                 err = -ENOMEM;
1963                 goto out_bad_inode;
1964         }
1965         args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
1966         if (old_format_only(sb))
1967                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
1968                                   TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
1969         else
1970                 make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
1971                                   TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
1972         memcpy(INODE_PKEY(inode), &ih.ih_key, KEY_SIZE);
1973         args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
1974 
1975         depth = reiserfs_write_unlock_nested(inode->i_sb);
1976         err = insert_inode_locked4(inode, args.objectid,
1977                              reiserfs_find_actor, &args);
1978         reiserfs_write_lock_nested(inode->i_sb, depth);
1979         if (err) {
1980                 err = -EINVAL;
1981                 goto out_bad_inode;
1982         }
1983 
1984         if (old_format_only(sb))
1985                 /*
1986                  * not a perfect generation count, as object ids can be reused,
1987                  * but this is as good as reiserfs can do right now.
1988                  * note that the private part of inode isn't filled in yet,
1989                  * we have to use the directory.
1990                  */
1991                 inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
1992         else
1993 #if defined( USE_INODE_GENERATION_COUNTER )
1994                 inode->i_generation =
1995                     le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
1996 #else
1997                 inode->i_generation = ++event;
1998 #endif
1999 
2000         /* fill stat data */
2001         set_nlink(inode, (S_ISDIR(mode) ? 2 : 1));
2002 
2003         /* uid and gid must already be set by the caller for quota init */
2004 
2005         /* symlink cannot be immutable or append only, right? */
2006         if (S_ISLNK(inode->i_mode))
2007                 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
2008 
2009         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
2010         inode->i_size = i_size;
2011         inode->i_blocks = 0;
2012         inode->i_bytes = 0;
2013         REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
2014             U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
2015 
2016         INIT_LIST_HEAD(&REISERFS_I(inode)->i_prealloc_list);
2017         REISERFS_I(inode)->i_flags = 0;
2018         REISERFS_I(inode)->i_prealloc_block = 0;
2019         REISERFS_I(inode)->i_prealloc_count = 0;
2020         REISERFS_I(inode)->i_trans_id = 0;
2021         REISERFS_I(inode)->i_jl = NULL;
2022         REISERFS_I(inode)->i_attrs =
2023             REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
2024         sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
2025         reiserfs_init_xattr_rwsem(inode);
2026 
2027         /* key to search for correct place for new stat data */
2028         _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
2029                       le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
2030                       TYPE_STAT_DATA, 3 /*key length */ );
2031 
2032         /* find proper place for inserting of stat data */
2033         retval = search_item(sb, &key, &path_to_key);
2034         if (retval == IO_ERROR) {
2035                 err = -EIO;
2036                 goto out_bad_inode;
2037         }
2038         if (retval == ITEM_FOUND) {
2039                 pathrelse(&path_to_key);
2040                 err = -EEXIST;
2041                 goto out_bad_inode;
2042         }
2043         if (old_format_only(sb)) {
2044                 /* i_uid or i_gid is too big to be stored in stat data v3.5 */
2045                 if (i_uid_read(inode) & ~0xffff || i_gid_read(inode) & ~0xffff) {
2046                         pathrelse(&path_to_key);
2047                         err = -EINVAL;
2048                         goto out_bad_inode;
2049                 }
2050                 inode2sd_v1(&sd, inode, inode->i_size);
2051         } else {
2052                 inode2sd(&sd, inode, inode->i_size);
2053         }
2054         /*
2055          * store in in-core inode the key of stat data and version all
2056          * object items will have (directory items will have old offset
2057          * format, other new objects will consist of new items)
2058          */
2059         if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
2060                 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
2061         else
2062                 set_inode_item_key_version(inode, KEY_FORMAT_3_6);
2063         if (old_format_only(sb))
2064                 set_inode_sd_version(inode, STAT_DATA_V1);
2065         else
2066                 set_inode_sd_version(inode, STAT_DATA_V2);
2067 
2068         /* insert the stat data into the tree */
2069 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
2070         if (REISERFS_I(dir)->new_packing_locality)
2071                 th->displace_new_blocks = 1;
2072 #endif
2073         retval =
2074             reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
2075                                  (char *)(&sd));
2076         if (retval) {
2077                 err = retval;
2078                 reiserfs_check_path(&path_to_key);
2079                 goto out_bad_inode;
2080         }
2081 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
2082         if (!th->displace_new_blocks)
2083                 REISERFS_I(dir)->new_packing_locality = 0;
2084 #endif
2085         if (S_ISDIR(mode)) {
2086                 /* insert item with "." and ".." */
2087                 retval =
2088                     reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
2089         }
2090 
2091         if (S_ISLNK(mode)) {
2092                 /* insert body of symlink */
2093                 if (!old_format_only(sb))
2094                         i_size = ROUND_UP(i_size);
2095                 retval =
2096                     reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
2097                                          i_size);
2098         }
2099         if (retval) {
2100                 err = retval;
2101                 reiserfs_check_path(&path_to_key);
2102                 journal_end(th);
2103                 goto out_inserted_sd;
2104         }
2105 
2106         if (reiserfs_posixacl(inode->i_sb)) {
2107                 reiserfs_write_unlock(inode->i_sb);
2108                 retval = reiserfs_inherit_default_acl(th, dir, dentry, inode);
2109                 reiserfs_write_lock(inode->i_sb);
2110                 if (retval) {
2111                         err = retval;
2112                         reiserfs_check_path(&path_to_key);
2113                         journal_end(th);
2114                         goto out_inserted_sd;
2115                 }
2116         } else if (inode->i_sb->s_flags & MS_POSIXACL) {
2117                 reiserfs_warning(inode->i_sb, "jdm-13090",
2118                                  "ACLs aren't enabled in the fs, "
2119                                  "but vfs thinks they are!");
2120         } else if (IS_PRIVATE(dir))
2121                 inode->i_flags |= S_PRIVATE;
2122 
2123         if (security->name) {
2124                 reiserfs_write_unlock(inode->i_sb);
2125                 retval = reiserfs_security_write(th, inode, security);
2126                 reiserfs_write_lock(inode->i_sb);
2127                 if (retval) {
2128                         err = retval;
2129                         reiserfs_check_path(&path_to_key);
2130                         retval = journal_end(th);
2131                         if (retval)
2132                                 err = retval;
2133                         goto out_inserted_sd;
2134                 }
2135         }
2136 
2137         reiserfs_update_sd(th, inode);
2138         reiserfs_check_path(&path_to_key);
2139 
2140         return 0;
2141 
2142 out_bad_inode:
2143         /* Invalidate the object, nothing was inserted yet */
2144         INODE_PKEY(inode)->k_objectid = 0;
2145 
2146         /* Quota change must be inside a transaction for journaling */
2147         depth = reiserfs_write_unlock_nested(inode->i_sb);
2148         dquot_free_inode(inode);
2149         reiserfs_write_lock_nested(inode->i_sb, depth);
2150 
2151 out_end_trans:
2152         journal_end(th);
2153         /*
2154          * Drop can be outside and it needs more credits so it's better
2155          * to have it outside
2156          */
2157         depth = reiserfs_write_unlock_nested(inode->i_sb);
2158         dquot_drop(inode);
2159         reiserfs_write_lock_nested(inode->i_sb, depth);
2160         inode->i_flags |= S_NOQUOTA;
2161         make_bad_inode(inode);
2162 
2163 out_inserted_sd:
2164         clear_nlink(inode);
2165         th->t_trans_id = 0;     /* so the caller can't use this handle later */
2166         unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
2167         iput(inode);
2168         return err;
2169 }
2170 
2171 /*
2172  * finds the tail page in the page cache,
2173  * reads the last block in.
2174  *
2175  * On success, page_result is set to a locked, pinned page, and bh_result
2176  * is set to an up to date buffer for the last block in the file.  returns 0.
2177  *
2178  * tail conversion is not done, so bh_result might not be valid for writing
2179  * check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
2180  * trying to write the block.
2181  *
2182  * on failure, nonzero is returned, page_result and bh_result are untouched.
2183  */
2184 static int grab_tail_page(struct inode *inode,
2185                           struct page **page_result,
2186                           struct buffer_head **bh_result)
2187 {
2188 
2189         /*
2190          * we want the page with the last byte in the file,
2191          * not the page that will hold the next byte for appending
2192          */
2193         unsigned long index = (inode->i_size - 1) >> PAGE_SHIFT;
2194         unsigned long pos = 0;
2195         unsigned long start = 0;
2196         unsigned long blocksize = inode->i_sb->s_blocksize;
2197         unsigned long offset = (inode->i_size) & (PAGE_SIZE - 1);
2198         struct buffer_head *bh;
2199         struct buffer_head *head;
2200         struct page *page;
2201         int error;
2202 
2203         /*
2204          * we know that we are only called with inode->i_size > 0.
2205          * we also know that a file tail can never be as big as a block
2206          * If i_size % blocksize == 0, our file is currently block aligned
2207          * and it won't need converting or zeroing after a truncate.
2208          */
2209         if ((offset & (blocksize - 1)) == 0) {
2210                 return -ENOENT;
2211         }
2212         page = grab_cache_page(inode->i_mapping, index);
2213         error = -ENOMEM;
2214         if (!page) {
2215                 goto out;
2216         }
2217         /* start within the page of the last block in the file */
2218         start = (offset / blocksize) * blocksize;
2219 
2220         error = __block_write_begin(page, start, offset - start,
2221                                     reiserfs_get_block_create_0);
2222         if (error)
2223                 goto unlock;
2224 
2225         head = page_buffers(page);
2226         bh = head;
2227         do {
2228                 if (pos >= start) {
2229                         break;
2230                 }
2231                 bh = bh->b_this_page;
2232                 pos += blocksize;
2233         } while (bh != head);
2234 
2235         if (!buffer_uptodate(bh)) {
2236                 /*
2237                  * note, this should never happen, prepare_write should be
2238                  * taking care of this for us.  If the buffer isn't up to
2239                  * date, I've screwed up the code to find the buffer, or the
2240                  * code to call prepare_write
2241                  */
2242                 reiserfs_error(inode->i_sb, "clm-6000",
2243                                "error reading block %lu", bh->b_blocknr);
2244                 error = -EIO;
2245                 goto unlock;
2246         }
2247         *bh_result = bh;
2248         *page_result = page;
2249 
2250 out:
2251         return error;
2252 
2253 unlock:
2254         unlock_page(page);
2255         put_page(page);
2256         return error;
2257 }
2258 
2259 /*
2260  * vfs version of truncate file.  Must NOT be called with
2261  * a transaction already started.
2262  *
2263  * some code taken from block_truncate_page
2264  */
2265 int reiserfs_truncate_file(struct inode *inode, int update_timestamps)
2266 {
2267         struct reiserfs_transaction_handle th;
2268         /* we want the offset for the first byte after the end of the file */
2269         unsigned long offset = inode->i_size & (PAGE_SIZE - 1);
2270         unsigned blocksize = inode->i_sb->s_blocksize;
2271         unsigned length;
2272         struct page *page = NULL;
2273         int error;
2274         struct buffer_head *bh = NULL;
2275         int err2;
2276 
2277         reiserfs_write_lock(inode->i_sb);
2278 
2279         if (inode->i_size > 0) {
2280                 error = grab_tail_page(inode, &page, &bh);
2281                 if (error) {
2282                         /*
2283                          * -ENOENT means we truncated past the end of the
2284                          * file, and get_block_create_0 could not find a
2285                          * block to read in, which is ok.
2286                          */
2287                         if (error != -ENOENT)
2288                                 reiserfs_error(inode->i_sb, "clm-6001",
2289                                                "grab_tail_page failed %d",
2290                                                error);
2291                         page = NULL;
2292                         bh = NULL;
2293                 }
2294         }
2295 
2296         /*
2297          * so, if page != NULL, we have a buffer head for the offset at
2298          * the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
2299          * then we have an unformatted node.  Otherwise, we have a direct item,
2300          * and no zeroing is required on disk.  We zero after the truncate,
2301          * because the truncate might pack the item anyway
2302          * (it will unmap bh if it packs).
2303          *
2304          * it is enough to reserve space in transaction for 2 balancings:
2305          * one for "save" link adding and another for the first
2306          * cut_from_item. 1 is for update_sd
2307          */
2308         error = journal_begin(&th, inode->i_sb,
2309                               JOURNAL_PER_BALANCE_CNT * 2 + 1);
2310         if (error)
2311                 goto out;
2312         reiserfs_update_inode_transaction(inode);
2313         if (update_timestamps)
2314                 /*
2315                  * we are doing real truncate: if the system crashes
2316                  * before the last transaction of truncating gets committed
2317                  * - on reboot the file either appears truncated properly
2318                  * or not truncated at all
2319                  */
2320                 add_save_link(&th, inode, 1);
2321         err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps);
2322         error = journal_end(&th);
2323         if (error)
2324                 goto out;
2325 
2326         /* check reiserfs_do_truncate after ending the transaction */
2327         if (err2) {
2328                 error = err2;
2329                 goto out;
2330         }
2331         
2332         if (update_timestamps) {
2333                 error = remove_save_link(inode, 1 /* truncate */);
2334                 if (error)
2335                         goto out;
2336         }
2337 
2338         if (page) {
2339                 length = offset & (blocksize - 1);
2340                 /* if we are not on a block boundary */
2341                 if (length) {
2342                         length = blocksize - length;
2343                         zero_user(page, offset, length);
2344                         if (buffer_mapped(bh) && bh->b_blocknr != 0) {
2345                                 mark_buffer_dirty(bh);
2346                         }
2347                 }
2348                 unlock_page(page);
2349                 put_page(page);
2350         }
2351 
2352         reiserfs_write_unlock(inode->i_sb);
2353 
2354         return 0;
2355 out:
2356         if (page) {
2357                 unlock_page(page);
2358                 put_page(page);
2359         }
2360 
2361         reiserfs_write_unlock(inode->i_sb);
2362 
2363         return error;
2364 }
2365 
2366 static int map_block_for_writepage(struct inode *inode,
2367                                    struct buffer_head *bh_result,
2368                                    unsigned long block)
2369 {
2370         struct reiserfs_transaction_handle th;
2371         int fs_gen;
2372         struct item_head tmp_ih;
2373         struct item_head *ih;
2374         struct buffer_head *bh;
2375         __le32 *item;
2376         struct cpu_key key;
2377         INITIALIZE_PATH(path);
2378         int pos_in_item;
2379         int jbegin_count = JOURNAL_PER_BALANCE_CNT;
2380         loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
2381         int retval;
2382         int use_get_block = 0;
2383         int bytes_copied = 0;
2384         int copy_size;
2385         int trans_running = 0;
2386 
2387         /*
2388          * catch places below that try to log something without
2389          * starting a trans
2390          */
2391         th.t_trans_id = 0;
2392 
2393         if (!buffer_uptodate(bh_result)) {
2394                 return -EIO;
2395         }
2396 
2397         kmap(bh_result->b_page);
2398 start_over:
2399         reiserfs_write_lock(inode->i_sb);
2400         make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
2401 
2402 research:
2403         retval = search_for_position_by_key(inode->i_sb, &key, &path);
2404         if (retval != POSITION_FOUND) {
2405                 use_get_block = 1;
2406                 goto out;
2407         }
2408 
2409         bh = get_last_bh(&path);
2410         ih = tp_item_head(&path);
2411         item = tp_item_body(&path);
2412         pos_in_item = path.pos_in_item;
2413 
2414         /* we've found an unformatted node */
2415         if (indirect_item_found(retval, ih)) {
2416                 if (bytes_copied > 0) {
2417                         reiserfs_warning(inode->i_sb, "clm-6002",
2418                                          "bytes_copied %d", bytes_copied);
2419                 }
2420                 if (!get_block_num(item, pos_in_item)) {
2421                         /* crap, we are writing to a hole */
2422                         use_get_block = 1;
2423                         goto out;
2424                 }
2425                 set_block_dev_mapped(bh_result,
2426                                      get_block_num(item, pos_in_item), inode);
2427         } else if (is_direct_le_ih(ih)) {
2428                 char *p;
2429                 p = page_address(bh_result->b_page);
2430                 p += (byte_offset - 1) & (PAGE_SIZE - 1);
2431                 copy_size = ih_item_len(ih) - pos_in_item;
2432 
2433                 fs_gen = get_generation(inode->i_sb);
2434                 copy_item_head(&tmp_ih, ih);
2435 
2436                 if (!trans_running) {
2437                         /* vs-3050 is gone, no need to drop the path */
2438                         retval = journal_begin(&th, inode->i_sb, jbegin_count);
2439                         if (retval)
2440                                 goto out;
2441                         reiserfs_update_inode_transaction(inode);
2442                         trans_running = 1;
2443                         if (fs_changed(fs_gen, inode->i_sb)
2444                             && item_moved(&tmp_ih, &path)) {
2445                                 reiserfs_restore_prepared_buffer(inode->i_sb,
2446                                                                  bh);
2447                                 goto research;
2448                         }
2449                 }
2450 
2451                 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
2452 
2453                 if (fs_changed(fs_gen, inode->i_sb)
2454                     && item_moved(&tmp_ih, &path)) {
2455                         reiserfs_restore_prepared_buffer(inode->i_sb, bh);
2456                         goto research;
2457                 }
2458 
2459                 memcpy(ih_item_body(bh, ih) + pos_in_item, p + bytes_copied,
2460                        copy_size);
2461 
2462                 journal_mark_dirty(&th, bh);
2463                 bytes_copied += copy_size;
2464                 set_block_dev_mapped(bh_result, 0, inode);
2465 
2466                 /* are there still bytes left? */
2467                 if (bytes_copied < bh_result->b_size &&
2468                     (byte_offset + bytes_copied) < inode->i_size) {
2469                         set_cpu_key_k_offset(&key,
2470                                              cpu_key_k_offset(&key) +
2471                                              copy_size);
2472                         goto research;
2473                 }
2474         } else {
2475                 reiserfs_warning(inode->i_sb, "clm-6003",
2476                                  "bad item inode %lu", inode->i_ino);
2477                 retval = -EIO;
2478                 goto out;
2479         }
2480         retval = 0;
2481 
2482 out:
2483         pathrelse(&path);
2484         if (trans_running) {
2485                 int err = journal_end(&th);
2486                 if (err)
2487                         retval = err;
2488                 trans_running = 0;
2489         }
2490         reiserfs_write_unlock(inode->i_sb);
2491 
2492         /* this is where we fill in holes in the file. */
2493         if (use_get_block) {
2494                 retval = reiserfs_get_block(inode, block, bh_result,
2495                                             GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
2496                                             | GET_BLOCK_NO_DANGLE);
2497                 if (!retval) {
2498                         if (!buffer_mapped(bh_result)
2499                             || bh_result->b_blocknr == 0) {
2500                                 /* get_block failed to find a mapped unformatted node. */
2501                                 use_get_block = 0;
2502                                 goto start_over;
2503                         }
2504                 }
2505         }
2506         kunmap(bh_result->b_page);
2507 
2508         if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
2509                 /*
2510                  * we've copied data from the page into the direct item, so the
2511                  * buffer in the page is now clean, mark it to reflect that.
2512                  */
2513                 lock_buffer(bh_result);
2514                 clear_buffer_dirty(bh_result);
2515                 unlock_buffer(bh_result);
2516         }
2517         return retval;
2518 }
2519 
2520 /*
2521  * mason@suse.com: updated in 2.5.54 to follow the same general io
2522  * start/recovery path as __block_write_full_page, along with special
2523  * code to handle reiserfs tails.
2524  */
2525 static int reiserfs_write_full_page(struct page *page,
2526                                     struct writeback_control *wbc)
2527 {
2528         struct inode *inode = page->mapping->host;
2529         unsigned long end_index = inode->i_size >> PAGE_SHIFT;
2530         int error = 0;
2531         unsigned long block;
2532         sector_t last_block;
2533         struct buffer_head *head, *bh;
2534         int partial = 0;
2535         int nr = 0;
2536         int checked = PageChecked(page);
2537         struct reiserfs_transaction_handle th;
2538         struct super_block *s = inode->i_sb;
2539         int bh_per_page = PAGE_SIZE / s->s_blocksize;
2540         th.t_trans_id = 0;
2541 
2542         /* no logging allowed when nonblocking or from PF_MEMALLOC */
2543         if (checked && (current->flags & PF_MEMALLOC)) {
2544                 redirty_page_for_writepage(wbc, page);
2545                 unlock_page(page);
2546                 return 0;
2547         }
2548 
2549         /*
2550          * The page dirty bit is cleared before writepage is called, which
2551          * means we have to tell create_empty_buffers to make dirty buffers
2552          * The page really should be up to date at this point, so tossing
2553          * in the BH_Uptodate is just a sanity check.
2554          */
2555         if (!page_has_buffers(page)) {
2556                 create_empty_buffers(page, s->s_blocksize,
2557                                      (1 << BH_Dirty) | (1 << BH_Uptodate));
2558         }
2559         head = page_buffers(page);
2560 
2561         /*
2562          * last page in the file, zero out any contents past the
2563          * last byte in the file
2564          */
2565         if (page->index >= end_index) {
2566                 unsigned last_offset;
2567 
2568                 last_offset = inode->i_size & (PAGE_SIZE - 1);
2569                 /* no file contents in this page */
2570                 if (page->index >= end_index + 1 || !last_offset) {
2571                         unlock_page(page);
2572                         return 0;
2573                 }
2574                 zero_user_segment(page, last_offset, PAGE_SIZE);
2575         }
2576         bh = head;
2577         block = page->index << (PAGE_SHIFT - s->s_blocksize_bits);
2578         last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
2579         /* first map all the buffers, logging any direct items we find */
2580         do {
2581                 if (block > last_block) {
2582                         /*
2583                          * This can happen when the block size is less than
2584                          * the page size.  The corresponding bytes in the page
2585                          * were zero filled above
2586                          */
2587                         clear_buffer_dirty(bh);
2588                         set_buffer_uptodate(bh);
2589                 } else if ((checked || buffer_dirty(bh)) &&
2590                            (!buffer_mapped(bh) || (buffer_mapped(bh)
2591                                                        && bh->b_blocknr ==
2592                                                        0))) {
2593                         /*
2594                          * not mapped yet, or it points to a direct item, search
2595                          * the btree for the mapping info, and log any direct
2596                          * items found
2597                          */
2598                         if ((error = map_block_for_writepage(inode, bh, block))) {
2599                                 goto fail;
2600                         }
2601                 }
2602                 bh = bh->b_this_page;
2603                 block++;
2604         } while (bh != head);
2605 
2606         /*
2607          * we start the transaction after map_block_for_writepage,
2608          * because it can create holes in the file (an unbounded operation).
2609          * starting it here, we can make a reliable estimate for how many
2610          * blocks we're going to log
2611          */
2612         if (checked) {
2613                 ClearPageChecked(page);
2614                 reiserfs_write_lock(s);
2615                 error = journal_begin(&th, s, bh_per_page + 1);
2616                 if (error) {
2617                         reiserfs_write_unlock(s);
2618                         goto fail;
2619                 }
2620                 reiserfs_update_inode_transaction(inode);
2621         }
2622         /* now go through and lock any dirty buffers on the page */
2623         do {
2624                 get_bh(bh);
2625                 if (!buffer_mapped(bh))
2626                         continue;
2627                 if (buffer_mapped(bh) && bh->b_blocknr == 0)
2628                         continue;
2629 
2630                 if (checked) {
2631                         reiserfs_prepare_for_journal(s, bh, 1);
2632                         journal_mark_dirty(&th, bh);
2633                         continue;
2634                 }
2635                 /*
2636                  * from this point on, we know the buffer is mapped to a
2637                  * real block and not a direct item
2638                  */
2639                 if (wbc->sync_mode != WB_SYNC_NONE) {
2640                         lock_buffer(bh);
2641                 } else {
2642                         if (!trylock_buffer(bh)) {
2643                                 redirty_page_for_writepage(wbc, page);
2644                                 continue;
2645                         }
2646                 }
2647                 if (test_clear_buffer_dirty(bh)) {
2648                         mark_buffer_async_write(bh);
2649                 } else {
2650                         unlock_buffer(bh);
2651                 }
2652         } while ((bh = bh->b_this_page) != head);
2653 
2654         if (checked) {
2655                 error = journal_end(&th);
2656                 reiserfs_write_unlock(s);
2657                 if (error)
2658                         goto fail;
2659         }
2660         BUG_ON(PageWriteback(page));
2661         set_page_writeback(page);
2662         unlock_page(page);
2663 
2664         /*
2665          * since any buffer might be the only dirty buffer on the page,
2666          * the first submit_bh can bring the page out of writeback.
2667          * be careful with the buffers.
2668          */
2669         do {
2670                 struct buffer_head *next = bh->b_this_page;
2671                 if (buffer_async_write(bh)) {
2672                         submit_bh(REQ_OP_WRITE, 0, bh);
2673                         nr++;
2674                 }
2675                 put_bh(bh);
2676                 bh = next;
2677         } while (bh != head);
2678 
2679         error = 0;
2680 done:
2681         if (nr == 0) {
2682                 /*
2683                  * if this page only had a direct item, it is very possible for
2684                  * no io to be required without there being an error.  Or,
2685                  * someone else could have locked them and sent them down the
2686                  * pipe without locking the page
2687                  */
2688                 bh = head;
2689                 do {
2690                         if (!buffer_uptodate(bh)) {
2691                                 partial = 1;
2692                                 break;
2693                         }
2694                         bh = bh->b_this_page;
2695                 } while (bh != head);
2696                 if (!partial)
2697                         SetPageUptodate(page);
2698                 end_page_writeback(page);
2699         }
2700         return error;
2701 
2702 fail:
2703         /*
2704          * catches various errors, we need to make sure any valid dirty blocks
2705          * get to the media.  The page is currently locked and not marked for
2706          * writeback
2707          */
2708         ClearPageUptodate(page);
2709         bh = head;
2710         do {
2711                 get_bh(bh);
2712                 if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
2713                         lock_buffer(bh);
2714                         mark_buffer_async_write(bh);
2715                 } else {
2716                         /*
2717                          * clear any dirty bits that might have come from
2718                          * getting attached to a dirty page
2719                          */
2720                         clear_buffer_dirty(bh);
2721                 }
2722                 bh = bh->b_this_page;
2723         } while (bh != head);
2724         SetPageError(page);
2725         BUG_ON(PageWriteback(page));
2726         set_page_writeback(page);
2727         unlock_page(page);
2728         do {
2729                 struct buffer_head *next = bh->b_this_page;
2730                 if (buffer_async_write(bh)) {
2731                         clear_buffer_dirty(bh);
2732                         submit_bh(REQ_OP_WRITE, 0, bh);
2733                         nr++;
2734                 }
2735                 put_bh(bh);
2736                 bh = next;
2737         } while (bh != head);
2738         goto done;
2739 }
2740 
2741 static int reiserfs_readpage(struct file *f, struct page *page)
2742 {
2743         return block_read_full_page(page, reiserfs_get_block);
2744 }
2745 
2746 static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
2747 {
2748         struct inode *inode = page->mapping->host;
2749         reiserfs_wait_on_write_block(inode->i_sb);
2750         return reiserfs_write_full_page(page, wbc);
2751 }
2752 
2753 static void reiserfs_truncate_failed_write(struct inode *inode)
2754 {
2755         truncate_inode_pages(inode->i_mapping, inode->i_size);
2756         reiserfs_truncate_file(inode, 0);
2757 }
2758 
2759 static int reiserfs_write_begin(struct file *file,
2760                                 struct address_space *mapping,
2761                                 loff_t pos, unsigned len, unsigned flags,
2762                                 struct page **pagep, void **fsdata)
2763 {
2764         struct inode *inode;
2765         struct page *page;
2766         pgoff_t index;
2767         int ret;
2768         int old_ref = 0;
2769 
2770         inode = mapping->host;
2771         *fsdata = NULL;
2772         if (flags & AOP_FLAG_CONT_EXPAND &&
2773             (pos & (inode->i_sb->s_blocksize - 1)) == 0) {
2774                 pos ++;
2775                 *fsdata = (void *)(unsigned long)flags;
2776         }
2777 
2778         index = pos >> PAGE_SHIFT;
2779         page = grab_cache_page_write_begin(mapping, index, flags);
2780         if (!page)
2781                 return -ENOMEM;
2782         *pagep = page;
2783 
2784         reiserfs_wait_on_write_block(inode->i_sb);
2785         fix_tail_page_for_writing(page);
2786         if (reiserfs_transaction_running(inode->i_sb)) {
2787                 struct reiserfs_transaction_handle *th;
2788                 th = (struct reiserfs_transaction_handle *)current->
2789                     journal_info;
2790                 BUG_ON(!th->t_refcount);
2791                 BUG_ON(!th->t_trans_id);
2792                 old_ref = th->t_refcount;
2793                 th->t_refcount++;
2794         }
2795         ret = __block_write_begin(page, pos, len, reiserfs_get_block);
2796         if (ret && reiserfs_transaction_running(inode->i_sb)) {
2797                 struct reiserfs_transaction_handle *th = current->journal_info;
2798                 /*
2799                  * this gets a little ugly.  If reiserfs_get_block returned an
2800                  * error and left a transacstion running, we've got to close
2801                  * it, and we've got to free handle if it was a persistent
2802                  * transaction.
2803                  *
2804                  * But, if we had nested into an existing transaction, we need
2805                  * to just drop the ref count on the handle.
2806                  *
2807                  * If old_ref == 0, the transaction is from reiserfs_get_block,
2808                  * and it was a persistent trans.  Otherwise, it was nested
2809                  * above.
2810                  */
2811                 if (th->t_refcount > old_ref) {
2812                         if (old_ref)
2813                                 th->t_refcount--;
2814                         else {
2815                                 int err;
2816                                 reiserfs_write_lock(inode->i_sb);
2817                                 err = reiserfs_end_persistent_transaction(th);
2818                                 reiserfs_write_unlock(inode->i_sb);
2819                                 if (err)
2820                                         ret = err;
2821                         }
2822                 }
2823         }
2824         if (ret) {
2825                 unlock_page(page);
2826                 put_page(page);
2827                 /* Truncate allocated blocks */
2828                 reiserfs_truncate_failed_write(inode);
2829         }
2830         return ret;
2831 }
2832 
2833 int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len)
2834 {
2835         struct inode *inode = page->mapping->host;
2836         int ret;
2837         int old_ref = 0;
2838         int depth;
2839 
2840         depth = reiserfs_write_unlock_nested(inode->i_sb);
2841         reiserfs_wait_on_write_block(inode->i_sb);
2842         reiserfs_write_lock_nested(inode->i_sb, depth);
2843 
2844         fix_tail_page_for_writing(page);
2845         if (reiserfs_transaction_running(inode->i_sb)) {
2846                 struct reiserfs_transaction_handle *th;
2847                 th = (struct reiserfs_transaction_handle *)current->
2848                     journal_info;
2849                 BUG_ON(!th->t_refcount);
2850                 BUG_ON(!th->t_trans_id);
2851                 old_ref = th->t_refcount;
2852                 th->t_refcount++;
2853         }
2854 
2855         ret = __block_write_begin(page, from, len, reiserfs_get_block);
2856         if (ret && reiserfs_transaction_running(inode->i_sb)) {
2857                 struct reiserfs_transaction_handle *th = current->journal_info;
2858                 /*
2859                  * this gets a little ugly.  If reiserfs_get_block returned an
2860                  * error and left a transacstion running, we've got to close
2861                  * it, and we've got to free handle if it was a persistent
2862                  * transaction.
2863                  *
2864                  * But, if we had nested into an existing transaction, we need
2865                  * to just drop the ref count on the handle.
2866                  *
2867                  * If old_ref == 0, the transaction is from reiserfs_get_block,
2868                  * and it was a persistent trans.  Otherwise, it was nested
2869                  * above.
2870                  */
2871                 if (th->t_refcount > old_ref) {
2872                         if (old_ref)
2873                                 th->t_refcount--;
2874                         else {
2875                                 int err;
2876                                 reiserfs_write_lock(inode->i_sb);
2877                                 err = reiserfs_end_persistent_transaction(th);
2878                                 reiserfs_write_unlock(inode->i_sb);
2879                                 if (err)
2880                                         ret = err;
2881                         }
2882                 }
2883         }
2884         return ret;
2885 
2886 }
2887 
2888 static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
2889 {
2890         return generic_block_bmap(as, block, reiserfs_bmap);
2891 }
2892 
2893 static int reiserfs_write_end(struct file *file, struct address_space *mapping,
2894                               loff_t pos, unsigned len, unsigned copied,
2895                               struct page *page, void *fsdata)
2896 {
2897         struct inode *inode = page->mapping->host;
2898         int ret = 0;
2899         int update_sd = 0;
2900         struct reiserfs_transaction_handle *th;
2901         unsigned start;
2902         bool locked = false;
2903 
2904         if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
2905                 pos ++;
2906 
2907         reiserfs_wait_on_write_block(inode->i_sb);
2908         if (reiserfs_transaction_running(inode->i_sb))
2909                 th = current->journal_info;
2910         else
2911                 th = NULL;
2912 
2913         start = pos & (PAGE_SIZE - 1);
2914         if (unlikely(copied < len)) {
2915                 if (!PageUptodate(page))
2916                         copied = 0;
2917 
2918                 page_zero_new_buffers(page, start + copied, start + len);
2919         }
2920         flush_dcache_page(page);
2921 
2922         reiserfs_commit_page(inode, page, start, start + copied);
2923 
2924         /*
2925          * generic_commit_write does this for us, but does not update the
2926          * transaction tracking stuff when the size changes.  So, we have
2927          * to do the i_size updates here.
2928          */
2929         if (pos + copied > inode->i_size) {
2930                 struct reiserfs_transaction_handle myth;
2931                 reiserfs_write_lock(inode->i_sb);
2932                 locked = true;
2933                 /*
2934                  * If the file have grown beyond the border where it
2935                  * can have a tail, unmark it as needing a tail
2936                  * packing
2937                  */
2938                 if ((have_large_tails(inode->i_sb)
2939                      && inode->i_size > i_block_size(inode) * 4)
2940                     || (have_small_tails(inode->i_sb)
2941                         && inode->i_size > i_block_size(inode)))
2942                         REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2943 
2944                 ret = journal_begin(&myth, inode->i_sb, 1);
2945                 if (ret)
2946                         goto journal_error;
2947 
2948                 reiserfs_update_inode_transaction(inode);
2949                 inode->i_size = pos + copied;
2950                 /*
2951                  * this will just nest into our transaction.  It's important
2952                  * to use mark_inode_dirty so the inode gets pushed around on
2953                  * the dirty lists, and so that O_SYNC works as expected
2954                  */
2955                 mark_inode_dirty(inode);
2956                 reiserfs_update_sd(&myth, inode);
2957                 update_sd = 1;
2958                 ret = journal_end(&myth);
2959                 if (ret)
2960                         goto journal_error;
2961         }
2962         if (th) {
2963                 if (!locked) {
2964                         reiserfs_write_lock(inode->i_sb);
2965                         locked = true;
2966                 }
2967                 if (!update_sd)
2968                         mark_inode_dirty(inode);
2969                 ret = reiserfs_end_persistent_transaction(th);
2970                 if (ret)
2971                         goto out;
2972         }
2973 
2974 out:
2975         if (locked)
2976                 reiserfs_write_unlock(inode->i_sb);
2977         unlock_page(page);
2978         put_page(page);
2979 
2980         if (pos + len > inode->i_size)
2981                 reiserfs_truncate_failed_write(inode);
2982 
2983         return ret == 0 ? copied : ret;
2984 
2985 journal_error:
2986         reiserfs_write_unlock(inode->i_sb);
2987         locked = false;
2988         if (th) {
2989                 if (!update_sd)
2990                         reiserfs_update_sd(th, inode);
2991                 ret = reiserfs_end_persistent_transaction(th);
2992         }
2993         goto out;
2994 }
2995 
2996 int reiserfs_commit_write(struct file *f, struct page *page,
2997                           unsigned from, unsigned to)
2998 {
2999         struct inode *inode = page->mapping->host;
3000         loff_t pos = ((loff_t) page->index << PAGE_SHIFT) + to;
3001         int ret = 0;
3002         int update_sd = 0;
3003         struct reiserfs_transaction_handle *th = NULL;
3004         int depth;
3005 
3006         depth = reiserfs_write_unlock_nested(inode->i_sb);
3007         reiserfs_wait_on_write_block(inode->i_sb);
3008         reiserfs_write_lock_nested(inode->i_sb, depth);
3009 
3010         if (reiserfs_transaction_running(inode->i_sb)) {
3011                 th = current->journal_info;
3012         }
3013         reiserfs_commit_page(inode, page, from, to);
3014 
3015         /*
3016          * generic_commit_write does this for us, but does not update the
3017          * transaction tracking stuff when the size changes.  So, we have
3018          * to do the i_size updates here.
3019          */
3020         if (pos > inode->i_size) {
3021                 struct reiserfs_transaction_handle myth;
3022                 /*
3023                  * If the file have grown beyond the border where it
3024                  * can have a tail, unmark it as needing a tail
3025                  * packing
3026                  */
3027                 if ((have_large_tails(inode->i_sb)
3028                      && inode->i_size > i_block_size(inode) * 4)
3029                     || (have_small_tails(inode->i_sb)
3030                         && inode->i_size > i_block_size(inode)))
3031                         REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
3032 
3033                 ret = journal_begin(&myth, inode->i_sb, 1);
3034                 if (ret)
3035                         goto journal_error;
3036 
3037                 reiserfs_update_inode_transaction(inode);
3038                 inode->i_size = pos;
3039                 /*
3040                  * this will just nest into our transaction.  It's important
3041                  * to use mark_inode_dirty so the inode gets pushed around
3042                  * on the dirty lists, and so that O_SYNC works as expected
3043                  */
3044                 mark_inode_dirty(inode);
3045                 reiserfs_update_sd(&myth, inode);
3046                 update_sd = 1;
3047                 ret = journal_end(&myth);
3048                 if (ret)
3049                         goto journal_error;
3050         }
3051         if (th) {
3052                 if (!update_sd)
3053                         mark_inode_dirty(inode);
3054                 ret = reiserfs_end_persistent_transaction(th);
3055                 if (ret)
3056                         goto out;
3057         }
3058 
3059 out:
3060         return ret;
3061 
3062 journal_error:
3063         if (th) {
3064                 if (!update_sd)
3065                         reiserfs_update_sd(th, inode);
3066                 ret = reiserfs_end_persistent_transaction(th);
3067         }
3068 
3069         return ret;
3070 }
3071 
3072 void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
3073 {
3074         if (reiserfs_attrs(inode->i_sb)) {
3075                 if (sd_attrs & REISERFS_SYNC_FL)
3076                         inode->i_flags |= S_SYNC;
3077                 else
3078                         inode->i_flags &= ~S_SYNC;
3079                 if (sd_attrs & REISERFS_IMMUTABLE_FL)
3080                         inode->i_flags |= S_IMMUTABLE;
3081                 else
3082                         inode->i_flags &= ~S_IMMUTABLE;
3083                 if (sd_attrs & REISERFS_APPEND_FL)
3084                         inode->i_flags |= S_APPEND;
3085                 else
3086                         inode->i_flags &= ~S_APPEND;
3087                 if (sd_attrs & REISERFS_NOATIME_FL)
3088                         inode->i_flags |= S_NOATIME;
3089                 else
3090                         inode->i_flags &= ~S_NOATIME;
3091                 if (sd_attrs & REISERFS_NOTAIL_FL)
3092                         REISERFS_I(inode)->i_flags |= i_nopack_mask;
3093                 else
3094                         REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
3095         }
3096 }
3097 
3098 void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
3099 {
3100         if (reiserfs_attrs(inode->i_sb)) {
3101                 if (inode->i_flags & S_IMMUTABLE)
3102                         *sd_attrs |= REISERFS_IMMUTABLE_FL;
3103                 else
3104                         *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
3105                 if (inode->i_flags & S_SYNC)
3106                         *sd_attrs |= REISERFS_SYNC_FL;
3107                 else
3108                         *sd_attrs &= ~REISERFS_SYNC_FL;
3109                 if (inode->i_flags & S_NOATIME)
3110                         *sd_attrs |= REISERFS_NOATIME_FL;
3111                 else
3112                         *sd_attrs &= ~REISERFS_NOATIME_FL;
3113                 if (REISERFS_I(inode)->i_flags & i_nopack_mask)
3114                         *sd_attrs |= REISERFS_NOTAIL_FL;
3115                 else
3116                         *sd_attrs &= ~REISERFS_NOTAIL_FL;
3117         }
3118 }
3119 
3120 /*
3121  * decide if this buffer needs to stay around for data logging or ordered
3122  * write purposes
3123  */
3124 static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
3125 {
3126         int ret = 1;
3127         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3128 
3129         lock_buffer(bh);
3130         spin_lock(&j->j_dirty_buffers_lock);
3131         if (!buffer_mapped(bh)) {
3132                 goto free_jh;
3133         }
3134         /*
3135          * the page is locked, and the only places that log a data buffer
3136          * also lock the page.
3137          */
3138         if (reiserfs_file_data_log(inode)) {
3139                 /*
3140                  * very conservative, leave the buffer pinned if
3141                  * anyone might need it.
3142                  */
3143                 if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
3144                         ret = 0;
3145                 }
3146         } else  if (buffer_dirty(bh)) {
3147                 struct reiserfs_journal_list *jl;
3148                 struct reiserfs_jh *jh = bh->b_private;
3149 
3150                 /*
3151                  * why is this safe?
3152                  * reiserfs_setattr updates i_size in the on disk
3153                  * stat data before allowing vmtruncate to be called.
3154                  *
3155                  * If buffer was put onto the ordered list for this
3156                  * transaction, we know for sure either this transaction
3157                  * or an older one already has updated i_size on disk,
3158                  * and this ordered data won't be referenced in the file
3159                  * if we crash.
3160                  *
3161                  * if the buffer was put onto the ordered list for an older
3162                  * transaction, we need to leave it around
3163                  */
3164                 if (jh && (jl = jh->jl)
3165                     && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
3166                         ret = 0;
3167         }
3168 free_jh:
3169         if (ret && bh->b_private) {
3170                 reiserfs_free_jh(bh);
3171         }
3172         spin_unlock(&j->j_dirty_buffers_lock);
3173         unlock_buffer(bh);
3174         return ret;
3175 }
3176 
3177 /* clm -- taken from fs/buffer.c:block_invalidate_page */
3178 static void reiserfs_invalidatepage(struct page *page, unsigned int offset,
3179                                     unsigned int length)
3180 {
3181         struct buffer_head *head, *bh, *next;
3182         struct inode *inode = page->mapping->host;
3183         unsigned int curr_off = 0;
3184         unsigned int stop = offset + length;
3185         int partial_page = (offset || length < PAGE_SIZE);
3186         int ret = 1;
3187 
3188         BUG_ON(!PageLocked(page));
3189 
3190         if (!partial_page)
3191                 ClearPageChecked(page);
3192 
3193         if (!page_has_buffers(page))
3194                 goto out;
3195 
3196         head = page_buffers(page);
3197         bh = head;
3198         do {
3199                 unsigned int next_off = curr_off + bh->b_size;
3200                 next = bh->b_this_page;
3201 
3202                 if (next_off > stop)
3203                         goto out;
3204 
3205                 /*
3206                  * is this block fully invalidated?
3207                  */
3208                 if (offset <= curr_off) {
3209                         if (invalidatepage_can_drop(inode, bh))
3210                                 reiserfs_unmap_buffer(bh);
3211                         else
3212                                 ret = 0;
3213                 }
3214                 curr_off = next_off;
3215                 bh = next;
3216         } while (bh != head);
3217 
3218         /*
3219          * We release buffers only if the entire page is being invalidated.
3220          * The get_block cached value has been unconditionally invalidated,
3221          * so real IO is not possible anymore.
3222          */
3223         if (!partial_page && ret) {
3224                 ret = try_to_release_page(page, 0);
3225                 /* maybe should BUG_ON(!ret); - neilb */
3226         }
3227 out:
3228         return;
3229 }
3230 
3231 static int reiserfs_set_page_dirty(struct page *page)
3232 {
3233         struct inode *inode = page->mapping->host;
3234         if (reiserfs_file_data_log(inode)) {
3235                 SetPageChecked(page);
3236                 return __set_page_dirty_nobuffers(page);
3237         }
3238         return __set_page_dirty_buffers(page);
3239 }
3240 
3241 /*
3242  * Returns 1 if the page's buffers were dropped.  The page is locked.
3243  *
3244  * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
3245  * in the buffers at page_buffers(page).
3246  *
3247  * even in -o notail mode, we can't be sure an old mount without -o notail
3248  * didn't create files with tails.
3249  */
3250 static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
3251 {
3252         struct inode *inode = page->mapping->host;
3253         struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3254         struct buffer_head *head;
3255         struct buffer_head *bh;
3256         int ret = 1;
3257 
3258         WARN_ON(PageChecked(page));
3259         spin_lock(&j->j_dirty_buffers_lock);
3260         head = page_buffers(page);
3261         bh = head;
3262         do {
3263                 if (bh->b_private) {
3264                         if (!buffer_dirty(bh) && !buffer_locked(bh)) {
3265                                 reiserfs_free_jh(bh);
3266                         } else {
3267                                 ret = 0;
3268                                 break;
3269                         }
3270                 }
3271                 bh = bh->b_this_page;
3272         } while (bh != head);
3273         if (ret)
3274                 ret = try_to_free_buffers(page);
3275         spin_unlock(&j->j_dirty_buffers_lock);
3276         return ret;
3277 }
3278 
3279 /*
3280  * We thank Mingming Cao for helping us understand in great detail what
3281  * to do in this section of the code.
3282  */
3283 static ssize_t reiserfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
3284 {
3285         struct file *file = iocb->ki_filp;
3286         struct inode *inode = file->f_mapping->host;
3287         size_t count = iov_iter_count(iter);
3288         ssize_t ret;
3289 
3290         ret = blockdev_direct_IO(iocb, inode, iter,
3291                                  reiserfs_get_blocks_direct_io);
3292 
3293         /*
3294          * In case of error extending write may have instantiated a few
3295          * blocks outside i_size. Trim these off again.
3296          */
3297         if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
3298                 loff_t isize = i_size_read(inode);
3299                 loff_t end = iocb->ki_pos + count;
3300 
3301                 if ((end > isize) && inode_newsize_ok(inode, isize) == 0) {
3302                         truncate_setsize(inode, isize);
3303                         reiserfs_vfs_truncate_file(inode);
3304                 }
3305         }
3306 
3307         return ret;
3308 }
3309 
3310 int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
3311 {
3312         struct inode *inode = d_inode(dentry);
3313         unsigned int ia_valid;
3314         int error;
3315 
3316         error = setattr_prepare(dentry, attr);
3317         if (error)
3318                 return error;
3319 
3320         /* must be turned off for recursive notify_change calls */
3321         ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
3322 
3323         if (is_quota_modification(inode, attr)) {
3324                 error = dquot_initialize(inode);
3325                 if (error)
3326                         return error;
3327         }
3328         reiserfs_write_lock(inode->i_sb);
3329         if (attr->ia_valid & ATTR_SIZE) {
3330                 /*
3331                  * version 2 items will be caught by the s_maxbytes check
3332                  * done for us in vmtruncate
3333                  */
3334                 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
3335                     attr->ia_size > MAX_NON_LFS) {
3336                         reiserfs_write_unlock(inode->i_sb);
3337                         error = -EFBIG;
3338                         goto out;
3339                 }
3340 
3341                 inode_dio_wait(inode);
3342 
3343                 /* fill in hole pointers in the expanding truncate case. */
3344                 if (attr->ia_size > inode->i_size) {
3345                         error = generic_cont_expand_simple(inode, attr->ia_size);
3346                         if (REISERFS_I(inode)->i_prealloc_count > 0) {
3347                                 int err;
3348                                 struct reiserfs_transaction_handle th;
3349                                 /* we're changing at most 2 bitmaps, inode + super */
3350                                 err = journal_begin(&th, inode->i_sb, 4);
3351                                 if (!err) {
3352                                         reiserfs_discard_prealloc(&th, inode);
3353                                         err = journal_end(&th);
3354                                 }
3355                                 if (err)
3356                                         error = err;
3357                         }
3358                         if (error) {
3359                                 reiserfs_write_unlock(inode->i_sb);
3360                                 goto out;
3361                         }
3362                         /*
3363                          * file size is changed, ctime and mtime are
3364                          * to be updated
3365                          */
3366                         attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
3367                 }
3368         }
3369         reiserfs_write_unlock(inode->i_sb);
3370 
3371         if ((((attr->ia_valid & ATTR_UID) && (from_kuid(&init_user_ns, attr->ia_uid) & ~0xffff)) ||
3372              ((attr->ia_valid & ATTR_GID) && (from_kgid(&init_user_ns, attr->ia_gid) & ~0xffff))) &&
3373             (get_inode_sd_version(inode) == STAT_DATA_V1)) {
3374                 /* stat data of format v3.5 has 16 bit uid and gid */
3375                 error = -EINVAL;
3376                 goto out;
3377         }
3378 
3379         if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
3380             (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
3381                 struct reiserfs_transaction_handle th;
3382                 int jbegin_count =
3383                     2 *
3384                     (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
3385                      REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
3386                     2;
3387 
3388                 error = reiserfs_chown_xattrs(inode, attr);
3389 
3390                 if (error)
3391                         return error;
3392 
3393                 /*
3394                  * (user+group)*(old+new) structure - we count quota
3395                  * info and , inode write (sb, inode)
3396                  */
3397                 reiserfs_write_lock(inode->i_sb);
3398                 error = journal_begin(&th, inode->i_sb, jbegin_count);
3399                 reiserfs_write_unlock(inode->i_sb);
3400                 if (error)
3401                         goto out;
3402                 error = dquot_transfer(inode, attr);
3403                 reiserfs_write_lock(inode->i_sb);
3404                 if (error) {
3405                         journal_end(&th);
3406                         reiserfs_write_unlock(inode->i_sb);
3407                         goto out;
3408                 }
3409 
3410                 /*
3411                  * Update corresponding info in inode so that everything
3412                  * is in one transaction
3413                  */
3414                 if (attr->ia_valid & ATTR_UID)
3415                         inode->i_uid = attr->ia_uid;
3416                 if (attr->ia_valid & ATTR_GID)
3417                         inode->i_gid = attr->ia_gid;
3418                 mark_inode_dirty(inode);
3419                 error = journal_end(&th);
3420                 reiserfs_write_unlock(inode->i_sb);
3421                 if (error)
3422                         goto out;
3423         }
3424 
3425         if ((attr->ia_valid & ATTR_SIZE) &&
3426             attr->ia_size != i_size_read(inode)) {
3427                 error = inode_newsize_ok(inode, attr->ia_size);
3428                 if (!error) {
3429                         /*
3430                          * Could race against reiserfs_file_release
3431                          * if called from NFS, so take tailpack mutex.
3432                          */
3433                         mutex_lock(&REISERFS_I(inode)->tailpack);
3434                         truncate_setsize(inode, attr->ia_size);
3435                         reiserfs_truncate_file(inode, 1);
3436                         mutex_unlock(&REISERFS_I(inode)->tailpack);
3437                 }
3438         }
3439 
3440         if (!error) {
3441                 setattr_copy(inode, attr);
3442                 mark_inode_dirty(inode);
3443         }
3444 
3445         if (!error && reiserfs_posixacl(inode->i_sb)) {
3446                 if (attr->ia_valid & ATTR_MODE)
3447                         error = reiserfs_acl_chmod(inode);
3448         }
3449 
3450 out:
3451         return error;
3452 }
3453 
3454 const struct address_space_operations reiserfs_address_space_operations = {
3455         .writepage = reiserfs_writepage,
3456         .readpage = reiserfs_readpage,
3457         .readpages = reiserfs_readpages,
3458         .releasepage = reiserfs_releasepage,
3459         .invalidatepage = reiserfs_invalidatepage,
3460         .write_begin = reiserfs_write_begin,
3461         .write_end = reiserfs_write_end,
3462         .bmap = reiserfs_aop_bmap,
3463         .direct_IO = reiserfs_direct_IO,
3464         .set_page_dirty = reiserfs_set_page_dirty,
3465 };
3466 

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