1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /*
3 * Copyright (C) 2002, 2004 Oracle. All right
4 */
5
6 #include <linux/fs.h>
7 #include <linux/slab.h>
8 #include <linux/highmem.h>
9 #include <linux/pagemap.h>
10 #include <asm/byteorder.h>
11 #include <linux/swap.h>
12 #include <linux/mpage.h>
13 #include <linux/quotaops.h>
14 #include <linux/blkdev.h>
15 #include <linux/uio.h>
16 #include <linux/mm.h>
17
18 #include <cluster/masklog.h>
19
20 #include "ocfs2.h"
21
22 #include "alloc.h"
23 #include "aops.h"
24 #include "dlmglue.h"
25 #include "extent_map.h"
26 #include "file.h"
27 #include "inode.h"
28 #include "journal.h"
29 #include "suballoc.h"
30 #include "super.h"
31 #include "symlink.h"
32 #include "refcounttree.h"
33 #include "ocfs2_trace.h"
34
35 #include "buffer_head_io.h"
36 #include "dir.h"
37 #include "namei.h"
38 #include "sysfile.h"
39
40 static int ocfs2_symlink_get_block(struct inod
41 struct buff
42 {
43 int err = -EIO;
44 int status;
45 struct ocfs2_dinode *fe = NULL;
46 struct buffer_head *bh = NULL;
47 struct buffer_head *buffer_cache_bh =
48 struct ocfs2_super *osb = OCFS2_SB(ino
49 void *kaddr;
50
51 trace_ocfs2_symlink_get_block(
52 (unsigned long long)OC
53 (unsigned long long)ib
54
55 BUG_ON(ocfs2_inode_is_fast_symlink(ino
56
57 if ((iblock << inode->i_sb->s_blocksiz
58 mlog(ML_ERROR, "block offset >
59 (unsigned long long)ibloc
60 goto bail;
61 }
62
63 status = ocfs2_read_inode_block(inode,
64 if (status < 0) {
65 mlog_errno(status);
66 goto bail;
67 }
68 fe = (struct ocfs2_dinode *) bh->b_dat
69
70 if ((u64)iblock >= ocfs2_clusters_to_b
71
72 err = -ENOMEM;
73 mlog(ML_ERROR, "block offset i
74 "%llu\n", (unsigned long
75 goto bail;
76 }
77
78 /* We don't use the page cache to crea
79 * need be, copy it over from the buff
80 if (!buffer_uptodate(bh_result) && ocf
81 u64 blkno = le64_to_cpu(fe->id
82 iblock;
83 buffer_cache_bh = sb_getblk(os
84 if (!buffer_cache_bh) {
85 err = -ENOMEM;
86 mlog(ML_ERROR, "couldn
87 goto bail;
88 }
89
90 /* we haven't locked out trans
91 * could've happened. Since we
92 * the bh, even if it commits
93 * copy, the data is still goo
94 if (buffer_jbd(buffer_cache_bh
95 && ocfs2_inode_is_new(inod
96 kaddr = kmap_atomic(bh
97 if (!kaddr) {
98 mlog(ML_ERROR,
99 goto bail;
100 }
101 memcpy(kaddr + (bh_res
102 buffer_cache_bh
103 bh_result->b_si
104 kunmap_atomic(kaddr);
105 set_buffer_uptodate(bh
106 }
107 brelse(buffer_cache_bh);
108 }
109
110 map_bh(bh_result, inode->i_sb,
111 le64_to_cpu(fe->id2.i_list.l_re
112
113 err = 0;
114
115 bail:
116 brelse(bh);
117
118 return err;
119 }
120
121 static int ocfs2_lock_get_block(struct inode *
122 struct buffer_head *bh_res
123 {
124 int ret = 0;
125 struct ocfs2_inode_info *oi = OCFS2_I(
126
127 down_read(&oi->ip_alloc_sem);
128 ret = ocfs2_get_block(inode, iblock, b
129 up_read(&oi->ip_alloc_sem);
130
131 return ret;
132 }
133
134 int ocfs2_get_block(struct inode *inode, secto
135 struct buffer_head *bh_res
136 {
137 int err = 0;
138 unsigned int ext_flags;
139 u64 max_blocks = bh_result->b_size >>
140 u64 p_blkno, count, past_eof;
141 struct ocfs2_super *osb = OCFS2_SB(ino
142
143 trace_ocfs2_get_block((unsigned long l
144 (unsigned long l
145
146 if (OCFS2_I(inode)->ip_flags & OCFS2_I
147 mlog(ML_NOTICE, "get_block on
148 inode, inode->i_ino);
149
150 if (S_ISLNK(inode->i_mode)) {
151 /* this always does I/O for so
152 err = ocfs2_symlink_get_block(
153 goto bail;
154 }
155
156 err = ocfs2_extent_map_get_blocks(inod
157 &ext
158 if (err) {
159 mlog(ML_ERROR, "Error %d from
160 "%llu, NULL)\n", err, ino
161 (unsigned long long)p_blk
162 goto bail;
163 }
164
165 if (max_blocks < count)
166 count = max_blocks;
167
168 /*
169 * ocfs2 never allocates in this funct
170 * need to use BH_New is when we're ex
171 * system which doesn't support holes,
172 * allows __block_write_begin() to zer
173 *
174 * If we see this on a sparse file sys
175 * raced us and removed the cluster. I
176 * the buffers dirty and uptodate bits
177 * ignore it as a hole.
178 */
179 if (create && p_blkno == 0 && ocfs2_sp
180 clear_buffer_dirty(bh_result);
181 clear_buffer_uptodate(bh_resul
182 goto bail;
183 }
184
185 /* Treat the unwritten extent as a hol
186 if (p_blkno && !(ext_flags & OCFS2_EXT
187 map_bh(bh_result, inode->i_sb,
188
189 bh_result->b_size = count << inode->i_
190
191 if (!ocfs2_sparse_alloc(osb)) {
192 if (p_blkno == 0) {
193 err = -EIO;
194 mlog(ML_ERROR,
195 "iblock = %llu p_
196 (unsigned long lo
197 (unsigned long lo
198 (unsigned long lo
199 mlog(ML_ERROR, "Size %
200 dump_stack();
201 goto bail;
202 }
203 }
204
205 past_eof = ocfs2_blocks_for_bytes(inod
206
207 trace_ocfs2_get_block_end((unsigned lo
208 (unsigned lo
209 if (create && (iblock >= past_eof))
210 set_buffer_new(bh_result);
211
212 bail:
213 if (err < 0)
214 err = -EIO;
215
216 return err;
217 }
218
219 int ocfs2_read_inline_data(struct inode *inode
220 struct buffer_head
221 {
222 void *kaddr;
223 loff_t size;
224 struct ocfs2_dinode *di = (struct ocfs
225
226 if (!(le16_to_cpu(di->i_dyn_features)
227 ocfs2_error(inode->i_sb, "Inod
228 (unsigned long lon
229 return -EROFS;
230 }
231
232 size = i_size_read(inode);
233
234 if (size > PAGE_SIZE ||
235 size > ocfs2_max_inline_data_with_
236 ocfs2_error(inode->i_sb,
237 "Inode %llu has wi
238 (unsigned long lon
239 (unsigned long lon
240 return -EROFS;
241 }
242
243 kaddr = kmap_atomic(page);
244 if (size)
245 memcpy(kaddr, di->id2.i_data.i
246 /* Clear the remaining part of the pag
247 memset(kaddr + size, 0, PAGE_SIZE - si
248 flush_dcache_page(page);
249 kunmap_atomic(kaddr);
250
251 SetPageUptodate(page);
252
253 return 0;
254 }
255
256 static int ocfs2_readpage_inline(struct inode
257 {
258 int ret;
259 struct buffer_head *di_bh = NULL;
260
261 BUG_ON(!PageLocked(page));
262 BUG_ON(!(OCFS2_I(inode)->ip_dyn_featur
263
264 ret = ocfs2_read_inode_block(inode, &d
265 if (ret) {
266 mlog_errno(ret);
267 goto out;
268 }
269
270 ret = ocfs2_read_inline_data(inode, pa
271 out:
272 unlock_page(page);
273
274 brelse(di_bh);
275 return ret;
276 }
277
278 static int ocfs2_read_folio(struct file *file,
279 {
280 struct inode *inode = folio->mapping->
281 struct ocfs2_inode_info *oi = OCFS2_I(
282 loff_t start = folio_pos(folio);
283 int ret, unlock = 1;
284
285 trace_ocfs2_readpage((unsigned long lo
286
287 ret = ocfs2_inode_lock_with_page(inode
288 if (ret != 0) {
289 if (ret == AOP_TRUNCATED_PAGE)
290 unlock = 0;
291 mlog_errno(ret);
292 goto out;
293 }
294
295 if (down_read_trylock(&oi->ip_alloc_se
296 /*
297 * Unlock the folio and cycle
298 * busyloop waiting for ip_all
299 */
300 ret = AOP_TRUNCATED_PAGE;
301 folio_unlock(folio);
302 unlock = 0;
303 down_read(&oi->ip_alloc_sem);
304 up_read(&oi->ip_alloc_sem);
305 goto out_inode_unlock;
306 }
307
308 /*
309 * i_size might have just been updated
310 * might now be discovering a truncate
311 * block_read_full_folio->get_block fr
312 * beyond the end of a file, so we che
313 * (generic_file_read, vm_ops->fault)
314 * and notice that the folio they just
315 *
316 * XXX sys_readahead() seems to get th
317 */
318 if (start >= i_size_read(inode)) {
319 folio_zero_segment(folio, 0, f
320 folio_mark_uptodate(folio);
321 ret = 0;
322 goto out_alloc;
323 }
324
325 if (oi->ip_dyn_features & OCFS2_INLINE
326 ret = ocfs2_readpage_inline(in
327 else
328 ret = block_read_full_folio(fo
329 unlock = 0;
330
331 out_alloc:
332 up_read(&oi->ip_alloc_sem);
333 out_inode_unlock:
334 ocfs2_inode_unlock(inode, 0);
335 out:
336 if (unlock)
337 folio_unlock(folio);
338 return ret;
339 }
340
341 /*
342 * This is used only for read-ahead. Failures
343 * situations are safe to ignore.
344 *
345 * Right now, we don't bother with BH_Boundary
346 * are quite large (243 extents on 4k blocks),
347 * grow out to a tree. If need be, detecting b
348 * trivially be added in a future version of o
349 */
350 static void ocfs2_readahead(struct readahead_c
351 {
352 int ret;
353 struct inode *inode = rac->mapping->ho
354 struct ocfs2_inode_info *oi = OCFS2_I(
355
356 /*
357 * Use the nonblocking flag for the dl
358 * lock inversion, but don't bother wi
359 */
360 ret = ocfs2_inode_lock_full(inode, NUL
361 if (ret)
362 return;
363
364 if (down_read_trylock(&oi->ip_alloc_se
365 goto out_unlock;
366
367 /*
368 * Don't bother with inline-data. Ther
369 * to read-ahead in that case anyway..
370 */
371 if (oi->ip_dyn_features & OCFS2_INLINE
372 goto out_up;
373
374 /*
375 * Check whether a remote node truncat
376 * drop out in that case as it's not w
377 */
378 if (readahead_pos(rac) >= i_size_read(
379 goto out_up;
380
381 mpage_readahead(rac, ocfs2_get_block);
382
383 out_up:
384 up_read(&oi->ip_alloc_sem);
385 out_unlock:
386 ocfs2_inode_unlock(inode, 0);
387 }
388
389 /* Note: Because we don't support holes, our a
390 * already happened (allocation writes zeros t
391 * so we don't have to worry about ordered wri
392 * ocfs2_writepages.
393 *
394 * ->writepages is called during the process o
395 * during blocked lock processing. It can't b
396 * to during block mapping. It's relying on t
397 * mapping can't have disappeared under the di
398 * being asked to write back.
399 */
400 static int ocfs2_writepages(struct address_spa
401 struct writeback_control *wbc)
402 {
403 return mpage_writepages(mapping, wbc,
404 }
405
406 /* Taken from ext3. We don't necessarily need
407 * functionality yet, but IMHO it's better to
408 * thing so we can avoid introducing our own b
409 * their fixes when they happen) --Mark */
410 int walk_page_buffers( handle_t *handle,
411 struct buffer_head *he
412 unsigned from,
413 unsigned to,
414 int *partial,
415 int (*fn)( handle
416 struct
417 {
418 struct buffer_head *bh;
419 unsigned block_start, block_end;
420 unsigned blocksize = head->b_size;
421 int err, ret = 0;
422 struct buffer_head *next;
423
424 for ( bh = head, block_start = 0;
425 ret == 0 && (bh != head || !bl
426 block_start = block_end, bh =
427 {
428 next = bh->b_this_page;
429 block_end = block_start + bloc
430 if (block_end <= from || block
431 if (partial && !buffer
432 *partial = 1;
433 continue;
434 }
435 err = (*fn)(handle, bh);
436 if (!ret)
437 ret = err;
438 }
439 return ret;
440 }
441
442 static sector_t ocfs2_bmap(struct address_spac
443 {
444 sector_t status;
445 u64 p_blkno = 0;
446 int err = 0;
447 struct inode *inode = mapping->host;
448
449 trace_ocfs2_bmap((unsigned long long)O
450 (unsigned long long)b
451
452 /*
453 * The swap code (ab-)uses ->bmap to g
454 * bypasseѕ the file system for actua
455 * that on refcounted inodes, so we ha
456 * 0 is the magic code for a bmap erro
457 */
458 if (ocfs2_is_refcount_inode(inode))
459 return 0;
460
461 /* We don't need to lock journal syste
462 * accessed concurrently from multiple
463 */
464 if (!INODE_JOURNAL(inode)) {
465 err = ocfs2_inode_lock(inode,
466 if (err) {
467 if (err != -ENOENT)
468 mlog_errno(err
469 goto bail;
470 }
471 down_read(&OCFS2_I(inode)->ip_
472 }
473
474 if (!(OCFS2_I(inode)->ip_dyn_features
475 err = ocfs2_extent_map_get_blo
476
477
478 if (!INODE_JOURNAL(inode)) {
479 up_read(&OCFS2_I(inode)->ip_al
480 ocfs2_inode_unlock(inode, 0);
481 }
482
483 if (err) {
484 mlog(ML_ERROR, "get_blocks() f
485 (unsigned long long)block
486 mlog_errno(err);
487 goto bail;
488 }
489
490 bail:
491 status = err ? 0 : p_blkno;
492
493 return status;
494 }
495
496 static bool ocfs2_release_folio(struct folio *
497 {
498 if (!folio_buffers(folio))
499 return false;
500 return try_to_free_buffers(folio);
501 }
502
503 static void ocfs2_figure_cluster_boundaries(st
504 u3
505 un
506 un
507 {
508 unsigned int cluster_start = 0, cluste
509
510 if (unlikely(PAGE_SHIFT > osb->s_clust
511 unsigned int cpp;
512
513 cpp = 1 << (PAGE_SHIFT - osb->
514
515 cluster_start = cpos % cpp;
516 cluster_start = cluster_start
517
518 cluster_end = cluster_start +
519 }
520
521 BUG_ON(cluster_start > PAGE_SIZE);
522 BUG_ON(cluster_end > PAGE_SIZE);
523
524 if (start)
525 *start = cluster_start;
526 if (end)
527 *end = cluster_end;
528 }
529
530 /*
531 * 'from' and 'to' are the region in the page
532 *
533 * If pagesize > clustersize, this function wi
534 * of the cluster boundary.
535 *
536 * from == to == 0 is code for "zero the entir
537 */
538 static void ocfs2_clear_page_regions(struct pa
539 struct oc
540 unsigned
541 {
542 void *kaddr;
543 unsigned int cluster_start, cluster_en
544
545 ocfs2_figure_cluster_boundaries(osb, c
546
547 kaddr = kmap_atomic(page);
548
549 if (from || to) {
550 if (from > cluster_start)
551 memset(kaddr + cluster
552 if (to < cluster_end)
553 memset(kaddr + to, 0,
554 } else {
555 memset(kaddr + cluster_start,
556 }
557
558 kunmap_atomic(kaddr);
559 }
560
561 /*
562 * Nonsparse file systems fully allocate befor
563 * code. This prevents ocfs2_write() from tagg
564 * allocating one, which means ocfs2_map_page_
565 * read-in the blocks at the tail of our file.
566 * testing i_size against each block offset.
567 */
568 static int ocfs2_should_read_blk(struct inode
569 unsigned int
570 {
571 u64 offset = folio_pos(folio) + block_
572
573 if (ocfs2_sparse_alloc(OCFS2_SB(inode-
574 return 1;
575
576 if (i_size_read(inode) > offset)
577 return 1;
578
579 return 0;
580 }
581
582 /*
583 * Some of this taken from __block_write_begin
584 * mapping by now though, and the entire write
585 * it won't, so not much need to use BH_New.
586 *
587 * This will also skip zeroing, which is handl
588 */
589 int ocfs2_map_page_blocks(struct page *page, u
590 struct inode *inode,
591 unsigned int to, int
592 {
593 struct folio *folio = page_folio(page)
594 int ret = 0;
595 struct buffer_head *head, *bh, *wait[2
596 unsigned int block_end, block_start;
597 unsigned int bsize = i_blocksize(inode
598
599 head = folio_buffers(folio);
600 if (!head)
601 head = create_empty_buffers(fo
602
603 for (bh = head, block_start = 0; bh !=
604 bh = bh->b_this_page, block_start
605 block_end = block_start + bsiz
606
607 clear_buffer_new(bh);
608
609 /*
610 * Ignore blocks outside of ou
611 * they may belong to unalloca
612 */
613 if (block_start >= to || block
614 if (folio_test_uptodat
615 set_buffer_upt
616 continue;
617 }
618
619 /*
620 * For an allocating write wit
621 * size, we always write the e
622 */
623 if (new)
624 set_buffer_new(bh);
625
626 if (!buffer_mapped(bh)) {
627 map_bh(bh, inode->i_sb
628 clean_bdev_bh_alias(bh
629 }
630
631 if (folio_test_uptodate(folio)
632 set_buffer_uptodate(bh
633 } else if (!buffer_uptodate(bh
634 !buffer_new(bh) &&
635 ocfs2_should_read_b
636 (block_start < from
637 bh_read_nowait(bh, 0);
638 *wait_bh++=bh;
639 }
640
641 *p_blkno = *p_blkno + 1;
642 }
643
644 /*
645 * If we issued read requests - let th
646 */
647 while(wait_bh > wait) {
648 wait_on_buffer(*--wait_bh);
649 if (!buffer_uptodate(*wait_bh)
650 ret = -EIO;
651 }
652
653 if (ret == 0 || !new)
654 return ret;
655
656 /*
657 * If we get -EIO above, zero out any
658 * to avoid exposing stale data.
659 */
660 bh = head;
661 block_start = 0;
662 do {
663 block_end = block_start + bsiz
664 if (block_end <= from)
665 goto next_bh;
666 if (block_start >= to)
667 break;
668
669 folio_zero_range(folio, block_
670 set_buffer_uptodate(bh);
671 mark_buffer_dirty(bh);
672
673 next_bh:
674 block_start = block_end;
675 bh = bh->b_this_page;
676 } while (bh != head);
677
678 return ret;
679 }
680
681 #if (PAGE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
682 #define OCFS2_MAX_CTXT_PAGES 1
683 #else
684 #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLU
685 #endif
686
687 #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_
688
689 struct ocfs2_unwritten_extent {
690 struct list_head ue_node;
691 struct list_head ue_ip_node;
692 u32 ue_cpos;
693 u32 ue_phys;
694 };
695
696 /*
697 * Describe the state of a single cluster to b
698 */
699 struct ocfs2_write_cluster_desc {
700 u32 c_cpos;
701 u32 c_phys;
702 /*
703 * Give this a unique field because c_
704 * filled.
705 */
706 unsigned c_new;
707 unsigned c_clear_unwritten;
708 unsigned c_needs_zero;
709 };
710
711 struct ocfs2_write_ctxt {
712 /* Logical cluster position / len of w
713 u32 w_cpos
714 u32 w_clen
715
716 /* First cluster allocated in a nonspa
717 u32 w_firs
718
719 /* Type of caller. Must be one of buff
720 ocfs2_write_type_t w_type
721
722 struct ocfs2_write_cluster_desc w_desc
723
724 /*
725 * This is true if page_size > cluster
726 *
727 * It triggers a set of special cases
728 * have to deal with allocating writes
729 */
730 unsigned int w_larg
731
732 /*
733 * Pages involved in this write.
734 *
735 * w_target_page is the page being wri
736 *
737 * w_pages is an array of pages which
738 * w_target_page, and in the case of a
739 * page_size < cluster size, it will c
740 * pages adjacent to w_target_page whi
741 * out in so that future reads from th
742 * zero's.
743 */
744 unsigned int w_num_
745 struct page *w_pag
746 struct page *w_tar
747
748 /*
749 * w_target_locked is used for page_mk
750 * against w_target_page in ocfs2_writ
751 */
752 unsigned int w_targ
753
754 /*
755 * ocfs2_write_end() uses this to know
756 * write in the target should be.
757 */
758 unsigned int w_targ
759 unsigned int w_targ
760
761 /*
762 * We could use journal_current_handle
763 * IMHO -Mark
764 */
765 handle_t *w_han
766
767 struct buffer_head *w_di_
768
769 struct ocfs2_cached_dealloc_ctxt w_dea
770
771 struct list_head w_unwr
772 unsigned int w_unwr
773 };
774
775 void ocfs2_unlock_and_free_pages(struct page *
776 {
777 int i;
778
779 for(i = 0; i < num_pages; i++) {
780 if (pages[i]) {
781 unlock_page(pages[i]);
782 mark_page_accessed(pag
783 put_page(pages[i]);
784 }
785 }
786 }
787
788 static void ocfs2_unlock_pages(struct ocfs2_wr
789 {
790 int i;
791
792 /*
793 * w_target_locked is only set to true
794 * The intent is to allow us to lock t
795 * to write_end(). The caller must hol
796 */
797 if (wc->w_target_locked) {
798 BUG_ON(!wc->w_target_page);
799 for (i = 0; i < wc->w_num_page
800 if (wc->w_target_page
801 wc->w_pages[i]
802 break;
803 }
804 }
805 mark_page_accessed(wc->w_targe
806 put_page(wc->w_target_page);
807 }
808 ocfs2_unlock_and_free_pages(wc->w_page
809 }
810
811 static void ocfs2_free_unwritten_list(struct i
812 struct list_h
813 {
814 struct ocfs2_inode_info *oi = OCFS2_I(
815 struct ocfs2_unwritten_extent *ue = NU
816
817 list_for_each_entry_safe(ue, tmp, head
818 list_del(&ue->ue_node);
819 spin_lock(&oi->ip_lock);
820 list_del(&ue->ue_ip_node);
821 spin_unlock(&oi->ip_lock);
822 kfree(ue);
823 }
824 }
825
826 static void ocfs2_free_write_ctxt(struct inode
827 struct ocfs2
828 {
829 ocfs2_free_unwritten_list(inode, &wc->
830 ocfs2_unlock_pages(wc);
831 brelse(wc->w_di_bh);
832 kfree(wc);
833 }
834
835 static int ocfs2_alloc_write_ctxt(struct ocfs2
836 struct ocfs2
837 unsigned len
838 struct buffe
839 {
840 u32 cend;
841 struct ocfs2_write_ctxt *wc;
842
843 wc = kzalloc(sizeof(struct ocfs2_write
844 if (!wc)
845 return -ENOMEM;
846
847 wc->w_cpos = pos >> osb->s_clustersize
848 wc->w_first_new_cpos = UINT_MAX;
849 cend = (pos + len - 1) >> osb->s_clust
850 wc->w_clen = cend - wc->w_cpos + 1;
851 get_bh(di_bh);
852 wc->w_di_bh = di_bh;
853 wc->w_type = type;
854
855 if (unlikely(PAGE_SHIFT > osb->s_clust
856 wc->w_large_pages = 1;
857 else
858 wc->w_large_pages = 0;
859
860 ocfs2_init_dealloc_ctxt(&wc->w_dealloc
861 INIT_LIST_HEAD(&wc->w_unwritten_list);
862
863 *wcp = wc;
864
865 return 0;
866 }
867
868 /*
869 * If a page has any new buffers, zero them ou
870 * and dirty so they'll be written out (in ord
871 * block data from leaking). And clear the new
872 */
873 static void ocfs2_zero_new_buffers(struct page
874 {
875 unsigned int block_start, block_end;
876 struct buffer_head *head, *bh;
877
878 BUG_ON(!PageLocked(page));
879 if (!page_has_buffers(page))
880 return;
881
882 bh = head = page_buffers(page);
883 block_start = 0;
884 do {
885 block_end = block_start + bh->
886
887 if (buffer_new(bh)) {
888 if (block_end > from &
889 if (!PageUptod
890 unsign
891
892 start
893 end =
894
895 zero_u
896 set_bu
897 }
898
899 clear_buffer_n
900 mark_buffer_di
901 }
902 }
903
904 block_start = block_end;
905 bh = bh->b_this_page;
906 } while (bh != head);
907 }
908
909 /*
910 * Only called when we have a failure during a
911 * zero's to the newly allocated region.
912 */
913 static void ocfs2_write_failure(struct inode *
914 struct ocfs2_w
915 loff_t user_po
916 {
917 int i;
918 unsigned from = user_pos & (PAGE_SIZE
919 to = user_pos + user_len;
920 struct page *tmppage;
921
922 if (wc->w_target_page)
923 ocfs2_zero_new_buffers(wc->w_t
924
925 for(i = 0; i < wc->w_num_pages; i++) {
926 tmppage = wc->w_pages[i];
927
928 if (tmppage && page_has_buffer
929 if (ocfs2_should_order
930 ocfs2_jbd2_ino
931
932
933 block_commit_write(tmp
934 }
935 }
936 }
937
938 static int ocfs2_prepare_page_for_write(struct
939 struct
940 struct
941 loff_t
942 int ne
943 {
944 int ret;
945 unsigned int map_from = 0, map_to = 0;
946 unsigned int cluster_start, cluster_en
947 unsigned int user_data_from = 0, user_
948
949 ocfs2_figure_cluster_boundaries(OCFS2_
950 &clust
951
952 /* treat the write as new if the a hol
953 * the page boundary.
954 */
955 new = new | ((i_size_read(inode) <= pa
956 (page_offset(page) <=
957
958 if (page == wc->w_target_page) {
959 map_from = user_pos & (PAGE_SI
960 map_to = map_from + user_len;
961
962 if (new)
963 ret = ocfs2_map_page_b
964
965
966 else
967 ret = ocfs2_map_page_b
968
969 if (ret) {
970 mlog_errno(ret);
971 goto out;
972 }
973
974 user_data_from = map_from;
975 user_data_to = map_to;
976 if (new) {
977 map_from = cluster_sta
978 map_to = cluster_end;
979 }
980 } else {
981 /*
982 * If we haven't allocated the
983 * shouldn't be writing it out
984 * data. This is likely a math
985 */
986 BUG_ON(!new);
987
988 map_from = cluster_start;
989 map_to = cluster_end;
990
991 ret = ocfs2_map_page_blocks(pa
992 cl
993 if (ret) {
994 mlog_errno(ret);
995 goto out;
996 }
997 }
998
999 /*
1000 * Parts of newly allocated pages nee
1001 *
1002 * Above, we have also rewritten 'to'
1003 * the rest of the function is concer
1004 * range inside of a page needs to be
1005 *
1006 * We can skip this if the page is up
1007 * been zero'd from being read in as
1008 */
1009 if (new && !PageUptodate(page))
1010 ocfs2_clear_page_regions(page
1011 cpos
1012
1013 flush_dcache_page(page);
1014
1015 out:
1016 return ret;
1017 }
1018
1019 /*
1020 * This function will only grab one clusters
1021 */
1022 static int ocfs2_grab_pages_for_write(struct
1023 struct
1024 u32 cpo
1025 unsigne
1026 struct
1027 {
1028 int ret = 0, i;
1029 unsigned long start, target_index, en
1030 struct inode *inode = mapping->host;
1031 loff_t last_byte;
1032
1033 target_index = user_pos >> PAGE_SHIFT
1034
1035 /*
1036 * Figure out how many pages we'll be
1037 * non allocating write, we just chan
1038 * page. Otherwise, we'll need a whol
1039 * writing past i_size, we only need
1040 * last page of the write.
1041 */
1042 if (new) {
1043 wc->w_num_pages = ocfs2_pages
1044 start = ocfs2_align_clusters_
1045 /*
1046 * We need the index *past* t
1047 * touch. This is the page p
1048 * i_size, whichever is great
1049 */
1050 last_byte = max(user_pos + us
1051 BUG_ON(last_byte < 1);
1052 end_index = ((last_byte - 1)
1053 if ((start + wc->w_num_pages)
1054 wc->w_num_pages = end
1055 } else {
1056 wc->w_num_pages = 1;
1057 start = target_index;
1058 }
1059 end_index = (user_pos + user_len - 1)
1060
1061 for(i = 0; i < wc->w_num_pages; i++)
1062 index = start + i;
1063
1064 if (index >= target_index &&
1065 wc->w_type == OCFS2_WRITE
1066 /*
1067 * ocfs2_pagemkwrite(
1068 * and wants us to di
1069 * passed in.
1070 */
1071 lock_page(mmap_page);
1072
1073 /* Exit and let the c
1074 if (mmap_page->mappin
1075 WARN_ON(mmap_
1076 unlock_page(m
1077 ret = -EAGAIN
1078 goto out;
1079 }
1080
1081 get_page(mmap_page);
1082 wc->w_pages[i] = mmap
1083 wc->w_target_locked =
1084 } else if (index >= target_in
1085 wc->w_type == OCFS
1086 /* Direct write has n
1087 wc->w_pages[i] = NULL
1088 continue;
1089 } else {
1090 wc->w_pages[i] = find
1091
1092 if (!wc->w_pages[i])
1093 ret = -ENOMEM
1094 mlog_errno(re
1095 goto out;
1096 }
1097 }
1098 wait_for_stable_page(wc->w_pa
1099
1100 if (index == target_index)
1101 wc->w_target_page = w
1102 }
1103 out:
1104 if (ret)
1105 wc->w_target_locked = false;
1106 return ret;
1107 }
1108
1109 /*
1110 * Prepare a single cluster for write one clu
1111 */
1112 static int ocfs2_write_cluster(struct address
1113 u32 *phys, uns
1114 unsigned int c
1115 unsigned int s
1116 struct ocfs2_a
1117 struct ocfs2_a
1118 struct ocfs2_w
1119 loff_t user_po
1120 {
1121 int ret, i;
1122 u64 p_blkno;
1123 struct inode *inode = mapping->host;
1124 struct ocfs2_extent_tree et;
1125 int bpc = ocfs2_clusters_to_blocks(in
1126
1127 if (new) {
1128 u32 tmp_pos;
1129
1130 /*
1131 * This is safe to call with
1132 * any additional semaphores
1133 */
1134 tmp_pos = cpos;
1135 ret = ocfs2_add_inode_data(OC
1136 &t
1137 wc
1138 da
1139 /*
1140 * This shouldn't happen beca
1141 * calculated the correct met
1142 * internal tree allocation c
1143 * transaction credits itself
1144 *
1145 * If need be, we could handl
1146 * RESTART_TRANS here.
1147 */
1148 mlog_bug_on_msg(ret == -EAGAI
1149 "Inode %llu:
1150 (unsigned lon
1151 if (ret < 0) {
1152 mlog_errno(ret);
1153 goto out;
1154 }
1155 } else if (clear_unwritten) {
1156 ocfs2_init_dinode_extent_tree
1157
1158 ret = ocfs2_mark_extent_writt
1159
1160
1161 if (ret < 0) {
1162 mlog_errno(ret);
1163 goto out;
1164 }
1165 }
1166
1167 /*
1168 * The only reason this should fail i
1169 * find the extent added.
1170 */
1171 ret = ocfs2_get_clusters(inode, cpos,
1172 if (ret < 0) {
1173 mlog(ML_ERROR, "Get physical
1174 "at logical clust
1175 (unsigned long lo
1176 goto out;
1177 }
1178
1179 BUG_ON(*phys == 0);
1180
1181 p_blkno = ocfs2_clusters_to_blocks(in
1182 if (!should_zero)
1183 p_blkno += (user_pos >> inode
1184
1185 for(i = 0; i < wc->w_num_pages; i++)
1186 int tmpret;
1187
1188 /* This is the direct io targ
1189 if (wc->w_pages[i] == NULL) {
1190 p_blkno++;
1191 continue;
1192 }
1193
1194 tmpret = ocfs2_prepare_page_f
1195
1196
1197
1198 if (tmpret) {
1199 mlog_errno(tmpret);
1200 if (ret == 0)
1201 ret = tmpret;
1202 }
1203 }
1204
1205 /*
1206 * We only have cleanup to do in case
1207 */
1208 if (ret && new)
1209 ocfs2_write_failure(inode, wc
1210
1211 out:
1212
1213 return ret;
1214 }
1215
1216 static int ocfs2_write_cluster_by_desc(struct
1217 struct
1218 struct
1219 struct
1220 loff_t
1221 {
1222 int ret, i;
1223 loff_t cluster_off;
1224 unsigned int local_len = len;
1225 struct ocfs2_write_cluster_desc *desc
1226 struct ocfs2_super *osb = OCFS2_SB(ma
1227
1228 for (i = 0; i < wc->w_clen; i++) {
1229 desc = &wc->w_desc[i];
1230
1231 /*
1232 * We have to make sure that
1233 * doesn't extend past a sing
1234 */
1235 local_len = len;
1236 cluster_off = pos & (osb->s_c
1237 if ((cluster_off + local_len)
1238 local_len = osb->s_cl
1239
1240 ret = ocfs2_write_cluster(map
1241 des
1242 des
1243 des
1244 dat
1245 wc,
1246 if (ret) {
1247 mlog_errno(ret);
1248 goto out;
1249 }
1250
1251 len -= local_len;
1252 pos += local_len;
1253 }
1254
1255 ret = 0;
1256 out:
1257 return ret;
1258 }
1259
1260 /*
1261 * ocfs2_write_end() wants to know which part
1262 * should complete the write on. It's easiest
1263 * time when a more complete view of the writ
1264 */
1265 static void ocfs2_set_target_boundaries(struc
1266 struc
1267 loff_
1268 {
1269 struct ocfs2_write_cluster_desc *desc
1270
1271 wc->w_target_from = pos & (PAGE_SIZE
1272 wc->w_target_to = wc->w_target_from +
1273
1274 if (alloc == 0)
1275 return;
1276
1277 /*
1278 * Allocating write - we may have dif
1279 * on page size and cluster size.
1280 *
1281 * NOTE: We can no longer compute one
1282 * the actual write length and user p
1283 * different.
1284 */
1285
1286 if (wc->w_large_pages) {
1287 /*
1288 * We only care about the 1st
1289 * our range and whether they
1290 * value may be extended out
1291 * newly allocated cluster.
1292 */
1293 desc = &wc->w_desc[0];
1294 if (desc->c_needs_zero)
1295 ocfs2_figure_cluster_
1296
1297
1298
1299
1300 desc = &wc->w_desc[wc->w_clen
1301 if (desc->c_needs_zero)
1302 ocfs2_figure_cluster_
1303
1304
1305
1306 } else {
1307 wc->w_target_from = 0;
1308 wc->w_target_to = PAGE_SIZE;
1309 }
1310 }
1311
1312 /*
1313 * Check if this extent is marked UNWRITTEN b
1314 * do the zero work. And should not to clear
1315 * by the direct io procedure.
1316 * If this is a new extent that allocated by
1317 * the ip_unwritten_list.
1318 */
1319 static int ocfs2_unwritten_check(struct inode
1320 struct ocfs2
1321 struct ocfs2
1322 {
1323 struct ocfs2_inode_info *oi = OCFS2_I
1324 struct ocfs2_unwritten_extent *ue = N
1325 int ret = 0;
1326
1327 if (!desc->c_needs_zero)
1328 return 0;
1329
1330 retry:
1331 spin_lock(&oi->ip_lock);
1332 /* Needs not to zero no metter buffer
1333 * the cluster is doing zero. And he
1334 * cluster io finished. */
1335 list_for_each_entry(ue, &oi->ip_unwri
1336 if (desc->c_cpos == ue->ue_cp
1337 BUG_ON(desc->c_new);
1338 desc->c_needs_zero =
1339 desc->c_clear_unwritt
1340 goto unlock;
1341 }
1342 }
1343
1344 if (wc->w_type != OCFS2_WRITE_DIRECT)
1345 goto unlock;
1346
1347 if (new == NULL) {
1348 spin_unlock(&oi->ip_lock);
1349 new = kmalloc(sizeof(struct o
1350 GFP_NOFS);
1351 if (new == NULL) {
1352 ret = -ENOMEM;
1353 goto out;
1354 }
1355 goto retry;
1356 }
1357 /* This direct write will doing zero.
1358 new->ue_cpos = desc->c_cpos;
1359 new->ue_phys = desc->c_phys;
1360 desc->c_clear_unwritten = 0;
1361 list_add_tail(&new->ue_ip_node, &oi->
1362 list_add_tail(&new->ue_node, &wc->w_u
1363 wc->w_unwritten_count++;
1364 new = NULL;
1365 unlock:
1366 spin_unlock(&oi->ip_lock);
1367 out:
1368 kfree(new);
1369 return ret;
1370 }
1371
1372 /*
1373 * Populate each single-cluster write descrip
1374 * with information about the i/o to be done.
1375 *
1376 * Returns the number of clusters that will h
1377 * well as a worst case estimate of the numbe
1378 * would have to be created during a write to
1379 */
1380 static int ocfs2_populate_write_desc(struct i
1381 struct o
1382 unsigned
1383 unsigned
1384 {
1385 int ret;
1386 struct ocfs2_write_cluster_desc *desc
1387 unsigned int num_clusters = 0;
1388 unsigned int ext_flags = 0;
1389 u32 phys = 0;
1390 int i;
1391
1392 *clusters_to_alloc = 0;
1393 *extents_to_split = 0;
1394
1395 for (i = 0; i < wc->w_clen; i++) {
1396 desc = &wc->w_desc[i];
1397 desc->c_cpos = wc->w_cpos + i
1398
1399 if (num_clusters == 0) {
1400 /*
1401 * Need to look up th
1402 */
1403 ret = ocfs2_get_clust
1404
1405 if (ret) {
1406 mlog_errno(re
1407 goto out;
1408 }
1409
1410 /* We should already
1411 BUG_ON(ext_flags & OC
1412
1413 /*
1414 * Assume worst case
1415 * the middle of the
1416 *
1417 * We can assume that
1418 * left to right, in
1419 * insert code is sma
1420 * next splits into t
1421 */
1422 if (ext_flags & OCFS2
1423 *extents_to_s
1424 } else if (phys) {
1425 /*
1426 * Only increment phy
1427 * a hole.
1428 */
1429 phys++;
1430 }
1431
1432 /*
1433 * If w_first_new_cpos is < U
1434 * file that got extended. w
1435 * where the newly allocated
1436 * zero them.
1437 */
1438 if (desc->c_cpos >= wc->w_fir
1439 BUG_ON(phys == 0);
1440 desc->c_needs_zero =
1441 }
1442
1443 desc->c_phys = phys;
1444 if (phys == 0) {
1445 desc->c_new = 1;
1446 desc->c_needs_zero =
1447 desc->c_clear_unwritt
1448 *clusters_to_alloc =
1449 }
1450
1451 if (ext_flags & OCFS2_EXT_UNW
1452 desc->c_clear_unwritt
1453 desc->c_needs_zero =
1454 }
1455
1456 ret = ocfs2_unwritten_check(i
1457 if (ret) {
1458 mlog_errno(ret);
1459 goto out;
1460 }
1461
1462 num_clusters--;
1463 }
1464
1465 ret = 0;
1466 out:
1467 return ret;
1468 }
1469
1470 static int ocfs2_write_begin_inline(struct ad
1471 struct in
1472 struct oc
1473 {
1474 int ret;
1475 struct ocfs2_super *osb = OCFS2_SB(in
1476 struct page *page;
1477 handle_t *handle;
1478 struct ocfs2_dinode *di = (struct ocf
1479
1480 handle = ocfs2_start_trans(osb, OCFS2
1481 if (IS_ERR(handle)) {
1482 ret = PTR_ERR(handle);
1483 mlog_errno(ret);
1484 goto out;
1485 }
1486
1487 page = find_or_create_page(mapping, 0
1488 if (!page) {
1489 ocfs2_commit_trans(osb, handl
1490 ret = -ENOMEM;
1491 mlog_errno(ret);
1492 goto out;
1493 }
1494 /*
1495 * If we don't set w_num_pages then t
1496 * and freed on cleanup of the write
1497 */
1498 wc->w_pages[0] = wc->w_target_page =
1499 wc->w_num_pages = 1;
1500
1501 ret = ocfs2_journal_access_di(handle,
1502 OCFS2_J
1503 if (ret) {
1504 ocfs2_commit_trans(osb, handl
1505
1506 mlog_errno(ret);
1507 goto out;
1508 }
1509
1510 if (!(OCFS2_I(inode)->ip_dyn_features
1511 ocfs2_set_inode_data_inline(i
1512
1513 if (!PageUptodate(page)) {
1514 ret = ocfs2_read_inline_data(
1515 if (ret) {
1516 ocfs2_commit_trans(os
1517
1518 goto out;
1519 }
1520 }
1521
1522 wc->w_handle = handle;
1523 out:
1524 return ret;
1525 }
1526
1527 int ocfs2_size_fits_inline_data(struct buffer
1528 {
1529 struct ocfs2_dinode *di = (struct ocf
1530
1531 if (new_size <= le16_to_cpu(di->id2.i
1532 return 1;
1533 return 0;
1534 }
1535
1536 static int ocfs2_try_to_write_inline_data(str
1537 str
1538 uns
1539 str
1540 {
1541 int ret, written = 0;
1542 loff_t end = pos + len;
1543 struct ocfs2_inode_info *oi = OCFS2_I
1544 struct ocfs2_dinode *di = NULL;
1545
1546 trace_ocfs2_try_to_write_inline_data(
1547
1548
1549
1550 /*
1551 * Handle inodes which already have i
1552 */
1553 if (oi->ip_dyn_features & OCFS2_INLIN
1554 if (mmap_page == NULL &&
1555 ocfs2_size_fits_inline_da
1556 goto do_inline_write;
1557
1558 /*
1559 * The write won't fit - we h
1560 * inline extent list now.
1561 */
1562 ret = ocfs2_convert_inline_da
1563 if (ret)
1564 mlog_errno(ret);
1565 goto out;
1566 }
1567
1568 /*
1569 * Check whether the inode can accept
1570 */
1571 if (oi->ip_clusters != 0 || i_size_re
1572 return 0;
1573
1574 /*
1575 * Check whether the write can fit.
1576 */
1577 di = (struct ocfs2_dinode *)wc->w_di_
1578 if (mmap_page ||
1579 end > ocfs2_max_inline_data_with_
1580 return 0;
1581
1582 do_inline_write:
1583 ret = ocfs2_write_begin_inline(mappin
1584 if (ret) {
1585 mlog_errno(ret);
1586 goto out;
1587 }
1588
1589 /*
1590 * This signals to the caller that th
1591 * inline.
1592 */
1593 written = 1;
1594 out:
1595 return written ? written : ret;
1596 }
1597
1598 /*
1599 * This function only does anything for file
1600 * handle sparse files.
1601 *
1602 * What we want to do here is fill in any hol
1603 * of allocation and the end of our write. Th
1604 * write path can treat it as an non-allocati
1605 * special case code for sparse/nonsparse fil
1606 */
1607 static int ocfs2_expand_nonsparse_inode(struc
1608 struc
1609 loff_
1610 struc
1611 {
1612 int ret;
1613 loff_t newsize = pos + len;
1614
1615 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(in
1616
1617 if (newsize <= i_size_read(inode))
1618 return 0;
1619
1620 ret = ocfs2_extend_no_holes(inode, di
1621 if (ret)
1622 mlog_errno(ret);
1623
1624 /* There is no wc if this is call fro
1625 if (wc)
1626 wc->w_first_new_cpos =
1627 ocfs2_clusters_for_by
1628
1629 return ret;
1630 }
1631
1632 static int ocfs2_zero_tail(struct inode *inod
1633 loff_t pos)
1634 {
1635 int ret = 0;
1636
1637 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(i
1638 if (pos > i_size_read(inode))
1639 ret = ocfs2_zero_extend(inode
1640
1641 return ret;
1642 }
1643
1644 int ocfs2_write_begin_nolock(struct address_s
1645 loff_t pos, unsi
1646 struct page **pa
1647 struct buffer_he
1648 {
1649 int ret, cluster_of_pages, credits =
1650 unsigned int clusters_to_alloc, exten
1651 struct ocfs2_write_ctxt *wc;
1652 struct inode *inode = mapping->host;
1653 struct ocfs2_super *osb = OCFS2_SB(in
1654 struct ocfs2_dinode *di;
1655 struct ocfs2_alloc_context *data_ac =
1656 struct ocfs2_alloc_context *meta_ac =
1657 handle_t *handle;
1658 struct ocfs2_extent_tree et;
1659 int try_free = 1, ret1;
1660
1661 try_again:
1662 ret = ocfs2_alloc_write_ctxt(&wc, osb
1663 if (ret) {
1664 mlog_errno(ret);
1665 return ret;
1666 }
1667
1668 if (ocfs2_supports_inline_data(osb))
1669 ret = ocfs2_try_to_write_inli
1670
1671 if (ret == 1) {
1672 ret = 0;
1673 goto success;
1674 }
1675 if (ret < 0) {
1676 mlog_errno(ret);
1677 goto out;
1678 }
1679 }
1680
1681 /* Direct io change i_size late, shou
1682 if (type != OCFS2_WRITE_DIRECT) {
1683 if (ocfs2_sparse_alloc(osb))
1684 ret = ocfs2_zero_tail
1685 else
1686 ret = ocfs2_expand_no
1687
1688 if (ret) {
1689 mlog_errno(ret);
1690 goto out;
1691 }
1692 }
1693
1694 ret = ocfs2_check_range_for_refcount(
1695 if (ret < 0) {
1696 mlog_errno(ret);
1697 goto out;
1698 } else if (ret == 1) {
1699 clusters_need = wc->w_clen;
1700 ret = ocfs2_refcount_cow(inod
1701 wc->
1702 if (ret) {
1703 mlog_errno(ret);
1704 goto out;
1705 }
1706 }
1707
1708 ret = ocfs2_populate_write_desc(inode
1709 &exte
1710 if (ret) {
1711 mlog_errno(ret);
1712 goto out;
1713 }
1714 clusters_need += clusters_to_alloc;
1715
1716 di = (struct ocfs2_dinode *)wc->w_di_
1717
1718 trace_ocfs2_write_begin_nolock(
1719 (unsigned long long)O
1720 (long long)i_size_rea
1721 le32_to_cpu(di->i_clu
1722 pos, len, type, mmap_
1723 clusters_to_alloc, ex
1724
1725 /*
1726 * We set w_target_from, w_target_to
1727 * ocfs2_write_end() knows which rang
1728 * write out. An allocation requires
1729 * cluster range.
1730 */
1731 if (clusters_to_alloc || extents_to_s
1732 /*
1733 * XXX: We are stretching the
1734 * ocfs2_lock_allocators(). I
1735 * the work to be done.
1736 */
1737 ocfs2_init_dinode_extent_tree
1738
1739 ret = ocfs2_lock_allocators(i
1740 c
1741 &
1742 if (ret) {
1743 mlog_errno(ret);
1744 goto out;
1745 }
1746
1747 if (data_ac)
1748 data_ac->ac_resv = &O
1749
1750 credits = ocfs2_calc_extend_c
1751
1752 } else if (type == OCFS2_WRITE_DIRECT
1753 /* direct write needs not to
1754 goto success;
1755
1756 /*
1757 * We have to zero sparse allocated c
1758 * and non-sparse clusters we just ex
1759 * we know zeros will only be needed
1760 */
1761 if (wc->w_clen && (wc->w_desc[0].c_ne
1762 wc->w_desc[wc->w_c
1763 cluster_of_pages = 1;
1764 else
1765 cluster_of_pages = 0;
1766
1767 ocfs2_set_target_boundaries(osb, wc,
1768
1769 handle = ocfs2_start_trans(osb, credi
1770 if (IS_ERR(handle)) {
1771 ret = PTR_ERR(handle);
1772 mlog_errno(ret);
1773 goto out;
1774 }
1775
1776 wc->w_handle = handle;
1777
1778 if (clusters_to_alloc) {
1779 ret = dquot_alloc_space_nodir
1780 ocfs2_clusters_to_byt
1781 if (ret)
1782 goto out_commit;
1783 }
1784
1785 ret = ocfs2_journal_access_di(handle,
1786 OCFS2_J
1787 if (ret) {
1788 mlog_errno(ret);
1789 goto out_quota;
1790 }
1791
1792 /*
1793 * Fill our page array first. That wa
1794 * that we can zero and flush if we e
1795 * extent.
1796 */
1797 ret = ocfs2_grab_pages_for_write(mapp
1798 clus
1799 if (ret) {
1800 /*
1801 * ocfs2_grab_pages_for_write
1802 * the target page. In this c
1803 * page. This will trigger th
1804 * the operation.
1805 */
1806 if (type == OCFS2_WRITE_MMAP
1807 BUG_ON(wc->w_target_p
1808 ret = 0;
1809 goto out_quota;
1810 }
1811
1812 mlog_errno(ret);
1813 goto out_quota;
1814 }
1815
1816 ret = ocfs2_write_cluster_by_desc(map
1817 len
1818 if (ret) {
1819 mlog_errno(ret);
1820 goto out_quota;
1821 }
1822
1823 if (data_ac)
1824 ocfs2_free_alloc_context(data
1825 if (meta_ac)
1826 ocfs2_free_alloc_context(meta
1827
1828 success:
1829 if (pagep)
1830 *pagep = wc->w_target_page;
1831 *fsdata = wc;
1832 return 0;
1833 out_quota:
1834 if (clusters_to_alloc)
1835 dquot_free_space(inode,
1836 ocfs2_clusters_to_b
1837 out_commit:
1838 ocfs2_commit_trans(osb, handle);
1839
1840 out:
1841 /*
1842 * The mmapped page won't be unlocked
1843 * even in case of error here like EN
1844 * to unlock the target page manually
1845 * retrying again on ENOSPC, or when
1846 * to VM code.
1847 */
1848 if (wc->w_target_locked)
1849 unlock_page(mmap_page);
1850
1851 ocfs2_free_write_ctxt(inode, wc);
1852
1853 if (data_ac) {
1854 ocfs2_free_alloc_context(data
1855 data_ac = NULL;
1856 }
1857 if (meta_ac) {
1858 ocfs2_free_alloc_context(meta
1859 meta_ac = NULL;
1860 }
1861
1862 if (ret == -ENOSPC && try_free) {
1863 /*
1864 * Try to free some truncate
1865 * clusters to allocate.
1866 */
1867 try_free = 0;
1868
1869 ret1 = ocfs2_try_to_free_trun
1870 if (ret1 == 1)
1871 goto try_again;
1872
1873 if (ret1 < 0)
1874 mlog_errno(ret1);
1875 }
1876
1877 return ret;
1878 }
1879
1880 static int ocfs2_write_begin(struct file *fil
1881 loff_t pos, unsi
1882 struct page **pa
1883 {
1884 int ret;
1885 struct buffer_head *di_bh = NULL;
1886 struct inode *inode = mapping->host;
1887
1888 ret = ocfs2_inode_lock(inode, &di_bh,
1889 if (ret) {
1890 mlog_errno(ret);
1891 return ret;
1892 }
1893
1894 /*
1895 * Take alloc sem here to prevent con
1896 * the mapping, zeroing and tree mani
1897 * ocfs2_write() will be safe against
1898 * should also serve to lock out allo
1899 * writeable region.
1900 */
1901 down_write(&OCFS2_I(inode)->ip_alloc_
1902
1903 ret = ocfs2_write_begin_nolock(mappin
1904 pagep,
1905 if (ret) {
1906 mlog_errno(ret);
1907 goto out_fail;
1908 }
1909
1910 brelse(di_bh);
1911
1912 return 0;
1913
1914 out_fail:
1915 up_write(&OCFS2_I(inode)->ip_alloc_se
1916
1917 brelse(di_bh);
1918 ocfs2_inode_unlock(inode, 1);
1919
1920 return ret;
1921 }
1922
1923 static void ocfs2_write_end_inline(struct ino
1924 unsigned l
1925 struct ocf
1926 struct ocf
1927 {
1928 void *kaddr;
1929
1930 if (unlikely(*copied < len)) {
1931 if (!PageUptodate(wc->w_targe
1932 *copied = 0;
1933 return;
1934 }
1935 }
1936
1937 kaddr = kmap_atomic(wc->w_target_page
1938 memcpy(di->id2.i_data.id_data + pos,
1939 kunmap_atomic(kaddr);
1940
1941 trace_ocfs2_write_end_inline(
1942 (unsigned long long)OCFS2_I(inod
1943 (unsigned long long)pos, *copied
1944 le16_to_cpu(di->id2.i_data.id_co
1945 le16_to_cpu(di->i_dyn_features))
1946 }
1947
1948 int ocfs2_write_end_nolock(struct address_spa
1949 loff_t pos, unsign
1950 {
1951 int i, ret;
1952 unsigned from, to, start = pos & (PAG
1953 struct inode *inode = mapping->host;
1954 struct ocfs2_super *osb = OCFS2_SB(in
1955 struct ocfs2_write_ctxt *wc = fsdata;
1956 struct ocfs2_dinode *di = (struct ocf
1957 handle_t *handle = wc->w_handle;
1958 struct page *tmppage;
1959
1960 BUG_ON(!list_empty(&wc->w_unwritten_l
1961
1962 if (handle) {
1963 ret = ocfs2_journal_access_di
1964 wc->w_di_bh,
1965 if (ret) {
1966 copied = ret;
1967 mlog_errno(ret);
1968 goto out;
1969 }
1970 }
1971
1972 if (OCFS2_I(inode)->ip_dyn_features &
1973 ocfs2_write_end_inline(inode,
1974 goto out_write_size;
1975 }
1976
1977 if (unlikely(copied < len) && wc->w_t
1978 loff_t new_isize;
1979
1980 if (!PageUptodate(wc->w_targe
1981 copied = 0;
1982
1983 new_isize = max_t(loff_t, i_s
1984 if (new_isize > page_offset(w
1985 ocfs2_zero_new_buffer
1986
1987 else {
1988 /*
1989 * When page is fully
1990 * failed), do not bo
1991 * it instead so that
1992 * put page & buffer
1993 * state.
1994 */
1995 block_invalidate_foli
1996
1997 }
1998 }
1999 if (wc->w_target_page)
2000 flush_dcache_page(wc->w_targe
2001
2002 for(i = 0; i < wc->w_num_pages; i++)
2003 tmppage = wc->w_pages[i];
2004
2005 /* This is the direct io targ
2006 if (tmppage == NULL)
2007 continue;
2008
2009 if (tmppage == wc->w_target_p
2010 from = wc->w_target_f
2011 to = wc->w_target_to;
2012
2013 BUG_ON(from > PAGE_SI
2014 to > PAGE_SIZE
2015 to < from);
2016 } else {
2017 /*
2018 * Pages adjacent to
2019 * a hole-filling wri
2020 * to flush their ent
2021 */
2022 from = 0;
2023 to = PAGE_SIZE;
2024 }
2025
2026 if (page_has_buffers(tmppage)
2027 if (handle && ocfs2_s
2028 loff_t start_
2029 ((lof
2030 from;
2031 loff_t length
2032 ocfs2_jbd2_in
2033
2034 }
2035 block_commit_write(tm
2036 }
2037 }
2038
2039 out_write_size:
2040 /* Direct io do not update i_size her
2041 if (wc->w_type != OCFS2_WRITE_DIRECT)
2042 pos += copied;
2043 if (pos > i_size_read(inode))
2044 i_size_write(inode, p
2045 mark_inode_dirty(inod
2046 }
2047 inode->i_blocks = ocfs2_inode
2048 di->i_size = cpu_to_le64((u64
2049 inode_set_mtime_to_ts(inode,
2050 di->i_mtime = di->i_ctime = c
2051 di->i_mtime_nsec = di->i_ctim
2052 if (handle)
2053 ocfs2_update_inode_fs
2054 }
2055 if (handle)
2056 ocfs2_journal_dirty(handle, w
2057
2058 out:
2059 /* unlock pages before dealloc since
2060 * lock, or it will cause a deadlock
2061 * this lock and will ask for the pag
2062 * put it here to preserve the unlock
2063 */
2064 ocfs2_unlock_pages(wc);
2065
2066 if (handle)
2067 ocfs2_commit_trans(osb, handl
2068
2069 ocfs2_run_deallocs(osb, &wc->w_deallo
2070
2071 brelse(wc->w_di_bh);
2072 kfree(wc);
2073
2074 return copied;
2075 }
2076
2077 static int ocfs2_write_end(struct file *file,
2078 loff_t pos, unsign
2079 struct page *page,
2080 {
2081 int ret;
2082 struct inode *inode = mapping->host;
2083
2084 ret = ocfs2_write_end_nolock(mapping,
2085
2086 up_write(&OCFS2_I(inode)->ip_alloc_se
2087 ocfs2_inode_unlock(inode, 1);
2088
2089 return ret;
2090 }
2091
2092 struct ocfs2_dio_write_ctxt {
2093 struct list_head dw_zero_list;
2094 unsigned dw_zero_count
2095 int dw_orphaned;
2096 pid_t dw_writer_pid
2097 };
2098
2099 static struct ocfs2_dio_write_ctxt *
2100 ocfs2_dio_alloc_write_ctx(struct buffer_head
2101 {
2102 struct ocfs2_dio_write_ctxt *dwc = NU
2103
2104 if (bh->b_private)
2105 return bh->b_private;
2106
2107 dwc = kmalloc(sizeof(struct ocfs2_dio
2108 if (dwc == NULL)
2109 return NULL;
2110 INIT_LIST_HEAD(&dwc->dw_zero_list);
2111 dwc->dw_zero_count = 0;
2112 dwc->dw_orphaned = 0;
2113 dwc->dw_writer_pid = task_pid_nr(curr
2114 bh->b_private = dwc;
2115 *alloc = 1;
2116
2117 return dwc;
2118 }
2119
2120 static void ocfs2_dio_free_write_ctx(struct i
2121 struct o
2122 {
2123 ocfs2_free_unwritten_list(inode, &dwc
2124 kfree(dwc);
2125 }
2126
2127 /*
2128 * TODO: Make this into a generic get_blocks
2129 *
2130 * From do_direct_io in direct-io.c:
2131 * "So what we do is to permit the ->get_blo
2132 * bh.b_size with the size of IO which is p
2133 * this i_blkbits."
2134 *
2135 * This function is called directly from get_
2136 *
2137 * called like this: dio->get_blocks(dio->ino
2138 * fs_co
2139 */
2140 static int ocfs2_dio_wr_get_block(struct inod
2141 struct buffer_
2142 {
2143 struct ocfs2_super *osb = OCFS2_SB(in
2144 struct ocfs2_inode_info *oi = OCFS2_I
2145 struct ocfs2_write_ctxt *wc;
2146 struct ocfs2_write_cluster_desc *desc
2147 struct ocfs2_dio_write_ctxt *dwc = NU
2148 struct buffer_head *di_bh = NULL;
2149 u64 p_blkno;
2150 unsigned int i_blkbits = inode->i_sb-
2151 loff_t pos = iblock << i_blkbits;
2152 sector_t endblk = (i_size_read(inode)
2153 unsigned len, total_len = bh_result->
2154 int ret = 0, first_get_block = 0;
2155
2156 len = osb->s_clustersize - (pos & (os
2157 len = min(total_len, len);
2158
2159 /*
2160 * bh_result->b_size is count in get_
2161 * "pos" and "end", we need map twice
2162 * 1. area in file size, not set NEW;
2163 * 2. area out file size, set NEW.
2164 *
2165 * iblock endblk
2166 * |--------|---------|---------|----
2167 * |<-------area in file------->|
2168 */
2169
2170 if ((iblock <= endblk) &&
2171 ((iblock + ((len - 1) >> i_blkbit
2172 len = (endblk - iblock + 1) <
2173
2174 mlog(0, "get block of %lu at %llu:%u
2175 inode->i_ino, pos, le
2176
2177 /*
2178 * Because we need to change file siz
2179 * we may need to add it to orphan di
2180 * while file size will be changed.
2181 */
2182 if (pos + total_len <= i_size_read(in
2183
2184 /* This is the fast path for
2185 ret = ocfs2_lock_get_block(in
2186 if (buffer_mapped(bh_result)
2187 !buffer_new(bh_result) &&
2188 ret == 0)
2189 goto out;
2190
2191 /* Clear state set by ocfs2_g
2192 bh_result->b_state = 0;
2193 }
2194
2195 dwc = ocfs2_dio_alloc_write_ctx(bh_re
2196 if (unlikely(dwc == NULL)) {
2197 ret = -ENOMEM;
2198 mlog_errno(ret);
2199 goto out;
2200 }
2201
2202 if (ocfs2_clusters_for_bytes(inode->i
2203 ocfs2_clusters_for_bytes(inode->i
2204 !dwc->dw_orphaned) {
2205 /*
2206 * when we are going to alloc
2207 * inode to orphan dir, so we
2208 * system crashed during writ
2209 */
2210 ret = ocfs2_add_inode_to_orph
2211 if (ret < 0) {
2212 mlog_errno(ret);
2213 goto out;
2214 }
2215 dwc->dw_orphaned = 1;
2216 }
2217
2218 ret = ocfs2_inode_lock(inode, &di_bh,
2219 if (ret) {
2220 mlog_errno(ret);
2221 goto out;
2222 }
2223
2224 down_write(&oi->ip_alloc_sem);
2225
2226 if (first_get_block) {
2227 if (ocfs2_sparse_alloc(osb))
2228 ret = ocfs2_zero_tail
2229 else
2230 ret = ocfs2_expand_no
2231
2232 if (ret < 0) {
2233 mlog_errno(ret);
2234 goto unlock;
2235 }
2236 }
2237
2238 ret = ocfs2_write_begin_nolock(inode-
2239 OCFS2_
2240 (void
2241 if (ret) {
2242 mlog_errno(ret);
2243 goto unlock;
2244 }
2245
2246 desc = &wc->w_desc[0];
2247
2248 p_blkno = ocfs2_clusters_to_blocks(in
2249 BUG_ON(p_blkno == 0);
2250 p_blkno += iblock & (u64)(ocfs2_clust
2251
2252 map_bh(bh_result, inode->i_sb, p_blkn
2253 bh_result->b_size = len;
2254 if (desc->c_needs_zero)
2255 set_buffer_new(bh_result);
2256
2257 if (iblock > endblk)
2258 set_buffer_new(bh_result);
2259
2260 /* May sleep in end_io. It should not
2261 * it to dio work queue. */
2262 set_buffer_defer_completion(bh_result
2263
2264 if (!list_empty(&wc->w_unwritten_list
2265 struct ocfs2_unwritten_extent
2266
2267 ue = list_first_entry(&wc->w_
2268 struct
2269 ue_node
2270 BUG_ON(ue->ue_cpos != desc->c
2271 /* The physical address may b
2272 ue->ue_phys = desc->c_phys;
2273
2274 list_splice_tail_init(&wc->w_
2275 dwc->dw_zero_count += wc->w_u
2276 }
2277
2278 ret = ocfs2_write_end_nolock(inode->i
2279 BUG_ON(ret != len);
2280 ret = 0;
2281 unlock:
2282 up_write(&oi->ip_alloc_sem);
2283 ocfs2_inode_unlock(inode, 1);
2284 brelse(di_bh);
2285 out:
2286 return ret;
2287 }
2288
2289 static int ocfs2_dio_end_io_write(struct inod
2290 struct ocfs
2291 loff_t offs
2292 ssize_t byt
2293 {
2294 struct ocfs2_cached_dealloc_ctxt deal
2295 struct ocfs2_extent_tree et;
2296 struct ocfs2_super *osb = OCFS2_SB(in
2297 struct ocfs2_inode_info *oi = OCFS2_I
2298 struct ocfs2_unwritten_extent *ue = N
2299 struct buffer_head *di_bh = NULL;
2300 struct ocfs2_dinode *di;
2301 struct ocfs2_alloc_context *data_ac =
2302 struct ocfs2_alloc_context *meta_ac =
2303 handle_t *handle = NULL;
2304 loff_t end = offset + bytes;
2305 int ret = 0, credits = 0;
2306
2307 ocfs2_init_dealloc_ctxt(&dealloc);
2308
2309 /* We do clear unwritten, delete orph
2310 * of these happen, we can skip all t
2311 if (list_empty(&dwc->dw_zero_list) &&
2312 end <= i_size_read(inode) &&
2313 !dwc->dw_orphaned)
2314 goto out;
2315
2316 ret = ocfs2_inode_lock(inode, &di_bh,
2317 if (ret < 0) {
2318 mlog_errno(ret);
2319 goto out;
2320 }
2321
2322 down_write(&oi->ip_alloc_sem);
2323
2324 /* Delete orphan before acquire i_rws
2325 if (dwc->dw_orphaned) {
2326 BUG_ON(dwc->dw_writer_pid !=
2327
2328 end = end > i_size_read(inode
2329
2330 ret = ocfs2_del_inode_from_or
2331 !!end, end);
2332 if (ret < 0)
2333 mlog_errno(ret);
2334 }
2335
2336 di = (struct ocfs2_dinode *)di_bh->b_
2337
2338 ocfs2_init_dinode_extent_tree(&et, IN
2339
2340 /* Attach dealloc with extent tree in
2341 * which are already unlinked from cu
2342 * rotation and merging.
2343 */
2344 et.et_dealloc = &dealloc;
2345
2346 ret = ocfs2_lock_allocators(inode, &e
2347 &data_ac,
2348 if (ret) {
2349 mlog_errno(ret);
2350 goto unlock;
2351 }
2352
2353 credits = ocfs2_calc_extend_credits(i
2354
2355 handle = ocfs2_start_trans(osb, credi
2356 if (IS_ERR(handle)) {
2357 ret = PTR_ERR(handle);
2358 mlog_errno(ret);
2359 goto unlock;
2360 }
2361 ret = ocfs2_journal_access_di(handle,
2362 OCFS2_J
2363 if (ret) {
2364 mlog_errno(ret);
2365 goto commit;
2366 }
2367
2368 list_for_each_entry(ue, &dwc->dw_zero
2369 ret = ocfs2_assure_trans_cred
2370 if (ret < 0) {
2371 mlog_errno(ret);
2372 break;
2373 }
2374 ret = ocfs2_mark_extent_writt
2375
2376
2377
2378 if (ret < 0) {
2379 mlog_errno(ret);
2380 break;
2381 }
2382 }
2383
2384 if (end > i_size_read(inode)) {
2385 ret = ocfs2_set_inode_size(ha
2386 if (ret < 0)
2387 mlog_errno(ret);
2388 }
2389 commit:
2390 ocfs2_commit_trans(osb, handle);
2391 unlock:
2392 up_write(&oi->ip_alloc_sem);
2393 ocfs2_inode_unlock(inode, 1);
2394 brelse(di_bh);
2395 out:
2396 if (data_ac)
2397 ocfs2_free_alloc_context(data
2398 if (meta_ac)
2399 ocfs2_free_alloc_context(meta
2400 ocfs2_run_deallocs(osb, &dealloc);
2401 ocfs2_dio_free_write_ctx(inode, dwc);
2402
2403 return ret;
2404 }
2405
2406 /*
2407 * ocfs2_dio_end_io is called by the dio core
2408 * particularly interested in the aio/dio cas
2409 * to protect io on one node from truncation
2410 */
2411 static int ocfs2_dio_end_io(struct kiocb *ioc
2412 loff_t offset,
2413 ssize_t bytes,
2414 void *private)
2415 {
2416 struct inode *inode = file_inode(iocb
2417 int level;
2418 int ret = 0;
2419
2420 /* this io's submitter should not hav
2421 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)
2422
2423 if (bytes <= 0)
2424 mlog_ratelimited(ML_ERROR, "D
2425 (long long)b
2426 if (private) {
2427 if (bytes > 0)
2428 ret = ocfs2_dio_end_i
2429
2430 else
2431 ocfs2_dio_free_write_
2432 }
2433
2434 ocfs2_iocb_clear_rw_locked(iocb);
2435
2436 level = ocfs2_iocb_rw_locked_level(io
2437 ocfs2_rw_unlock(inode, level);
2438 return ret;
2439 }
2440
2441 static ssize_t ocfs2_direct_IO(struct kiocb *
2442 {
2443 struct file *file = iocb->ki_filp;
2444 struct inode *inode = file->f_mapping
2445 struct ocfs2_super *osb = OCFS2_SB(in
2446 get_block_t *get_block;
2447
2448 /*
2449 * Fallback to buffered I/O if we see
2450 * extents.
2451 */
2452 if (OCFS2_I(inode)->ip_dyn_features &
2453 return 0;
2454
2455 /* Fallback to buffered I/O if we do
2456 if (iocb->ki_pos + iter->count > i_si
2457 !ocfs2_supports_append_dio(osb))
2458 return 0;
2459
2460 if (iov_iter_rw(iter) == READ)
2461 get_block = ocfs2_lock_get_bl
2462 else
2463 get_block = ocfs2_dio_wr_get_
2464
2465 return __blockdev_direct_IO(iocb, ino
2466 iter, get
2467 ocfs2_dio
2468 }
2469
2470 const struct address_space_operations ocfs2_a
2471 .dirty_folio = block_dirty
2472 .read_folio = ocfs2_read_
2473 .readahead = ocfs2_reada
2474 .writepages = ocfs2_write
2475 .write_begin = ocfs2_write
2476 .write_end = ocfs2_write
2477 .bmap = ocfs2_bmap,
2478 .direct_IO = ocfs2_direc
2479 .invalidate_folio = block_inval
2480 .release_folio = ocfs2_relea
2481 .migrate_folio = buffer_migr
2482 .is_partially_uptodate = block_is_pa
2483 .error_remove_folio = generic_err
2484 };
2485
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