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1/*
2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <ooo@electrozaur.com>
6 *
7 * Copyrights for code taken from ext2:
8 * Copyright (C) 1992, 1993, 1994, 1995
9 * Remy Card (card@masi.ibp.fr)
10 * Laboratoire MASI - Institut Blaise Pascal
11 * Universite Pierre et Marie Curie (Paris VI)
12 * from
13 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * This file is part of exofs.
17 *
18 * exofs is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation. Since it is based on ext2, and the only
21 * valid version of GPL for the Linux kernel is version 2, the only valid
22 * version of GPL for exofs is version 2.
23 *
24 * exofs is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with exofs; if not, write to the Free Software
31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
32 */
33
34#include <linux/slab.h>
35
36#include "exofs.h"
37
38#define EXOFS_DBGMSG2(M...) do {} while (0)
39
40unsigned exofs_max_io_pages(struct ore_layout *layout,
41 unsigned expected_pages)
42{
43 unsigned pages = min_t(unsigned, expected_pages,
44 layout->max_io_length / PAGE_SIZE);
45
46 return pages;
47}
48
49struct page_collect {
50 struct exofs_sb_info *sbi;
51 struct inode *inode;
52 unsigned expected_pages;
53 struct ore_io_state *ios;
54
55 struct page **pages;
56 unsigned alloc_pages;
57 unsigned nr_pages;
58 unsigned long length;
59 loff_t pg_first; /* keep 64bit also in 32-arches */
60 bool read_4_write; /* This means two things: that the read is sync
61 * And the pages should not be unlocked.
62 */
63 struct page *that_locked_page;
64};
65
66static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
67 struct inode *inode)
68{
69 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
70
71 pcol->sbi = sbi;
72 pcol->inode = inode;
73 pcol->expected_pages = expected_pages;
74
75 pcol->ios = NULL;
76 pcol->pages = NULL;
77 pcol->alloc_pages = 0;
78 pcol->nr_pages = 0;
79 pcol->length = 0;
80 pcol->pg_first = -1;
81 pcol->read_4_write = false;
82 pcol->that_locked_page = NULL;
83}
84
85static void _pcol_reset(struct page_collect *pcol)
86{
87 pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
88
89 pcol->pages = NULL;
90 pcol->alloc_pages = 0;
91 pcol->nr_pages = 0;
92 pcol->length = 0;
93 pcol->pg_first = -1;
94 pcol->ios = NULL;
95 pcol->that_locked_page = NULL;
96
97 /* this is probably the end of the loop but in writes
98 * it might not end here. don't be left with nothing
99 */
100 if (!pcol->expected_pages)
101 pcol->expected_pages =
102 exofs_max_io_pages(&pcol->sbi->layout, ~0);
103}
104
105static int pcol_try_alloc(struct page_collect *pcol)
106{
107 unsigned pages;
108
109 /* TODO: easily support bio chaining */
110 pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages);
111
112 for (; pages; pages >>= 1) {
113 pcol->pages = kmalloc(pages * sizeof(struct page *),
114 GFP_KERNEL);
115 if (likely(pcol->pages)) {
116 pcol->alloc_pages = pages;
117 return 0;
118 }
119 }
120
121 EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
122 pcol->expected_pages);
123 return -ENOMEM;
124}
125
126static void pcol_free(struct page_collect *pcol)
127{
128 kfree(pcol->pages);
129 pcol->pages = NULL;
130
131 if (pcol->ios) {
132 ore_put_io_state(pcol->ios);
133 pcol->ios = NULL;
134 }
135}
136
137static int pcol_add_page(struct page_collect *pcol, struct page *page,
138 unsigned len)
139{
140 if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
141 return -ENOMEM;
142
143 pcol->pages[pcol->nr_pages++] = page;
144 pcol->length += len;
145 return 0;
146}
147
148enum {PAGE_WAS_NOT_IN_IO = 17};
149static int update_read_page(struct page *page, int ret)
150{
151 switch (ret) {
152 case 0:
153 /* Everything is OK */
154 SetPageUptodate(page);
155 if (PageError(page))
156 ClearPageError(page);
157 break;
158 case -EFAULT:
159 /* In this case we were trying to read something that wasn't on
160 * disk yet - return a page full of zeroes. This should be OK,
161 * because the object should be empty (if there was a write
162 * before this read, the read would be waiting with the page
163 * locked */
164 clear_highpage(page);
165
166 SetPageUptodate(page);
167 if (PageError(page))
168 ClearPageError(page);
169 EXOFS_DBGMSG("recovered read error\n");
170 /* fall through */
171 case PAGE_WAS_NOT_IN_IO:
172 ret = 0; /* recovered error */
173 break;
174 default:
175 SetPageError(page);
176 }
177 return ret;
178}
179
180static void update_write_page(struct page *page, int ret)
181{
182 if (unlikely(ret == PAGE_WAS_NOT_IN_IO))
183 return; /* don't pass start don't collect $200 */
184
185 if (ret) {
186 mapping_set_error(page->mapping, ret);
187 SetPageError(page);
188 }
189 end_page_writeback(page);
190}
191
192/* Called at the end of reads, to optionally unlock pages and update their
193 * status.
194 */
195static int __readpages_done(struct page_collect *pcol)
196{
197 int i;
198 u64 good_bytes;
199 u64 length = 0;
200 int ret = ore_check_io(pcol->ios, NULL);
201
202 if (likely(!ret)) {
203 good_bytes = pcol->length;
204 ret = PAGE_WAS_NOT_IN_IO;
205 } else {
206 good_bytes = 0;
207 }
208
209 EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
210 " length=0x%lx nr_pages=%u\n",
211 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
212 pcol->nr_pages);
213
214 for (i = 0; i < pcol->nr_pages; i++) {
215 struct page *page = pcol->pages[i];
216 struct inode *inode = page->mapping->host;
217 int page_stat;
218
219 if (inode != pcol->inode)
220 continue; /* osd might add more pages at end */
221
222 if (likely(length < good_bytes))
223 page_stat = 0;
224 else
225 page_stat = ret;
226
227 EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n",
228 inode->i_ino, page->index,
229 page_stat ? "bad_bytes" : "good_bytes");
230
231 ret = update_read_page(page, page_stat);
232 if (!pcol->read_4_write)
233 unlock_page(page);
234 length += PAGE_SIZE;
235 }
236
237 pcol_free(pcol);
238 EXOFS_DBGMSG2("readpages_done END\n");
239 return ret;
240}
241
242/* callback of async reads */
243static void readpages_done(struct ore_io_state *ios, void *p)
244{
245 struct page_collect *pcol = p;
246
247 __readpages_done(pcol);
248 atomic_dec(&pcol->sbi->s_curr_pending);
249 kfree(pcol);
250}
251
252static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
253{
254 int i;
255
256 for (i = 0; i < pcol->nr_pages; i++) {
257 struct page *page = pcol->pages[i];
258
259 if (rw == READ)
260 update_read_page(page, ret);
261 else
262 update_write_page(page, ret);
263
264 unlock_page(page);
265 }
266}
267
268static int _maybe_not_all_in_one_io(struct ore_io_state *ios,
269 struct page_collect *pcol_src, struct page_collect *pcol)
270{
271 /* length was wrong or offset was not page aligned */
272 BUG_ON(pcol_src->nr_pages < ios->nr_pages);
273
274 if (pcol_src->nr_pages > ios->nr_pages) {
275 struct page **src_page;
276 unsigned pages_less = pcol_src->nr_pages - ios->nr_pages;
277 unsigned long len_less = pcol_src->length - ios->length;
278 unsigned i;
279 int ret;
280
281 /* This IO was trimmed */
282 pcol_src->nr_pages = ios->nr_pages;
283 pcol_src->length = ios->length;
284
285 /* Left over pages are passed to the next io */
286 pcol->expected_pages += pages_less;
287 pcol->nr_pages = pages_less;
288 pcol->length = len_less;
289 src_page = pcol_src->pages + pcol_src->nr_pages;
290 pcol->pg_first = (*src_page)->index;
291
292 ret = pcol_try_alloc(pcol);
293 if (unlikely(ret))
294 return ret;
295
296 for (i = 0; i < pages_less; ++i)
297 pcol->pages[i] = *src_page++;
298
299 EXOFS_DBGMSG("Length was adjusted nr_pages=0x%x "
300 "pages_less=0x%x expected_pages=0x%x "
301 "next_offset=0x%llx next_len=0x%lx\n",
302 pcol_src->nr_pages, pages_less, pcol->expected_pages,
303 pcol->pg_first * PAGE_SIZE, pcol->length);
304 }
305 return 0;
306}
307
308static int read_exec(struct page_collect *pcol)
309{
310 struct exofs_i_info *oi = exofs_i(pcol->inode);
311 struct ore_io_state *ios;
312 struct page_collect *pcol_copy = NULL;
313 int ret;
314
315 if (!pcol->pages)
316 return 0;
317
318 if (!pcol->ios) {
319 int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true,
320 pcol->pg_first << PAGE_SHIFT,
321 pcol->length, &pcol->ios);
322
323 if (ret)
324 return ret;
325 }
326
327 ios = pcol->ios;
328 ios->pages = pcol->pages;
329
330 if (pcol->read_4_write) {
331 ore_read(pcol->ios);
332 return __readpages_done(pcol);
333 }
334
335 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
336 if (!pcol_copy) {
337 ret = -ENOMEM;
338 goto err;
339 }
340
341 *pcol_copy = *pcol;
342 ios->done = readpages_done;
343 ios->private = pcol_copy;
344
345 /* pages ownership was passed to pcol_copy */
346 _pcol_reset(pcol);
347
348 ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
349 if (unlikely(ret))
350 goto err;
351
352 EXOFS_DBGMSG2("read_exec(0x%lx) offset=0x%llx length=0x%llx\n",
353 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
354
355 ret = ore_read(ios);
356 if (unlikely(ret))
357 goto err;
358
359 atomic_inc(&pcol->sbi->s_curr_pending);
360
361 return 0;
362
363err:
364 if (!pcol_copy) /* Failed before ownership transfer */
365 pcol_copy = pcol;
366 _unlock_pcol_pages(pcol_copy, ret, READ);
367 pcol_free(pcol_copy);
368 kfree(pcol_copy);
369
370 return ret;
371}
372
373/* readpage_strip is called either directly from readpage() or by the VFS from
374 * within read_cache_pages(), to add one more page to be read. It will try to
375 * collect as many contiguous pages as posible. If a discontinuity is
376 * encountered, or it runs out of resources, it will submit the previous segment
377 * and will start a new collection. Eventually caller must submit the last
378 * segment if present.
379 */
380static int readpage_strip(void *data, struct page *page)
381{
382 struct page_collect *pcol = data;
383 struct inode *inode = pcol->inode;
384 struct exofs_i_info *oi = exofs_i(inode);
385 loff_t i_size = i_size_read(inode);
386 pgoff_t end_index = i_size >> PAGE_SHIFT;
387 size_t len;
388 int ret;
389
390 BUG_ON(!PageLocked(page));
391
392 /* FIXME: Just for debugging, will be removed */
393 if (PageUptodate(page))
394 EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
395 page->index);
396
397 pcol->that_locked_page = page;
398
399 if (page->index < end_index)
400 len = PAGE_SIZE;
401 else if (page->index == end_index)
402 len = i_size & ~PAGE_MASK;
403 else
404 len = 0;
405
406 if (!len || !obj_created(oi)) {
407 /* this will be out of bounds, or doesn't exist yet.
408 * Current page is cleared and the request is split
409 */
410 clear_highpage(page);
411
412 SetPageUptodate(page);
413 if (PageError(page))
414 ClearPageError(page);
415
416 if (!pcol->read_4_write)
417 unlock_page(page);
418 EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx "
419 "read_4_write=%d index=0x%lx end_index=0x%lx "
420 "splitting\n", inode->i_ino, len,
421 pcol->read_4_write, page->index, end_index);
422
423 return read_exec(pcol);
424 }
425
426try_again:
427
428 if (unlikely(pcol->pg_first == -1)) {
429 pcol->pg_first = page->index;
430 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
431 page->index)) {
432 /* Discontinuity detected, split the request */
433 ret = read_exec(pcol);
434 if (unlikely(ret))
435 goto fail;
436 goto try_again;
437 }
438
439 if (!pcol->pages) {
440 ret = pcol_try_alloc(pcol);
441 if (unlikely(ret))
442 goto fail;
443 }
444
445 if (len != PAGE_SIZE)
446 zero_user(page, len, PAGE_SIZE - len);
447
448 EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
449 inode->i_ino, page->index, len);
450
451 ret = pcol_add_page(pcol, page, len);
452 if (ret) {
453 EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
454 "this_len=0x%zx nr_pages=%u length=0x%lx\n",
455 page, len, pcol->nr_pages, pcol->length);
456
457 /* split the request, and start again with current page */
458 ret = read_exec(pcol);
459 if (unlikely(ret))
460 goto fail;
461
462 goto try_again;
463 }
464
465 return 0;
466
467fail:
468 /* SetPageError(page); ??? */
469 unlock_page(page);
470 return ret;
471}
472
473static int exofs_readpages(struct file *file, struct address_space *mapping,
474 struct list_head *pages, unsigned nr_pages)
475{
476 struct page_collect pcol;
477 int ret;
478
479 _pcol_init(&pcol, nr_pages, mapping->host);
480
481 ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
482 if (ret) {
483 EXOFS_ERR("read_cache_pages => %d\n", ret);
484 return ret;
485 }
486
487 ret = read_exec(&pcol);
488 if (unlikely(ret))
489 return ret;
490
491 return read_exec(&pcol);
492}
493
494static int _readpage(struct page *page, bool read_4_write)
495{
496 struct page_collect pcol;
497 int ret;
498
499 _pcol_init(&pcol, 1, page->mapping->host);
500
501 pcol.read_4_write = read_4_write;
502 ret = readpage_strip(&pcol, page);
503 if (ret) {
504 EXOFS_ERR("_readpage => %d\n", ret);
505 return ret;
506 }
507
508 return read_exec(&pcol);
509}
510
511/*
512 * We don't need the file
513 */
514static int exofs_readpage(struct file *file, struct page *page)
515{
516 return _readpage(page, false);
517}
518
519/* Callback for osd_write. All writes are asynchronous */
520static void writepages_done(struct ore_io_state *ios, void *p)
521{
522 struct page_collect *pcol = p;
523 int i;
524 u64 good_bytes;
525 u64 length = 0;
526 int ret = ore_check_io(ios, NULL);
527
528 atomic_dec(&pcol->sbi->s_curr_pending);
529
530 if (likely(!ret)) {
531 good_bytes = pcol->length;
532 ret = PAGE_WAS_NOT_IN_IO;
533 } else {
534 good_bytes = 0;
535 }
536
537 EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
538 " length=0x%lx nr_pages=%u\n",
539 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
540 pcol->nr_pages);
541
542 for (i = 0; i < pcol->nr_pages; i++) {
543 struct page *page = pcol->pages[i];
544 struct inode *inode = page->mapping->host;
545 int page_stat;
546
547 if (inode != pcol->inode)
548 continue; /* osd might add more pages to a bio */
549
550 if (likely(length < good_bytes))
551 page_stat = 0;
552 else
553 page_stat = ret;
554
555 update_write_page(page, page_stat);
556 unlock_page(page);
557 EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n",
558 inode->i_ino, page->index, page_stat);
559
560 length += PAGE_SIZE;
561 }
562
563 pcol_free(pcol);
564 kfree(pcol);
565 EXOFS_DBGMSG2("writepages_done END\n");
566}
567
568static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate)
569{
570 struct page_collect *pcol = priv;
571 pgoff_t index = offset / PAGE_SIZE;
572
573 if (!pcol->that_locked_page ||
574 (pcol->that_locked_page->index != index)) {
575 struct page *page;
576 loff_t i_size = i_size_read(pcol->inode);
577
578 if (offset >= i_size) {
579 *uptodate = true;
580 EXOFS_DBGMSG2("offset >= i_size index=0x%lx\n", index);
581 return ZERO_PAGE(0);
582 }
583
584 page = find_get_page(pcol->inode->i_mapping, index);
585 if (!page) {
586 page = find_or_create_page(pcol->inode->i_mapping,
587 index, GFP_NOFS);
588 if (unlikely(!page)) {
589 EXOFS_DBGMSG("grab_cache_page Failed "
590 "index=0x%llx\n", _LLU(index));
591 return NULL;
592 }
593 unlock_page(page);
594 }
595 *uptodate = PageUptodate(page);
596 EXOFS_DBGMSG2("index=0x%lx uptodate=%d\n", index, *uptodate);
597 return page;
598 } else {
599 EXOFS_DBGMSG2("YES that_locked_page index=0x%lx\n",
600 pcol->that_locked_page->index);
601 *uptodate = true;
602 return pcol->that_locked_page;
603 }
604}
605
606static void __r4w_put_page(void *priv, struct page *page)
607{
608 struct page_collect *pcol = priv;
609
610 if ((pcol->that_locked_page != page) && (ZERO_PAGE(0) != page)) {
611 EXOFS_DBGMSG2("index=0x%lx\n", page->index);
612 put_page(page);
613 return;
614 }
615 EXOFS_DBGMSG2("that_locked_page index=0x%lx\n",
616 ZERO_PAGE(0) == page ? -1 : page->index);
617}
618
619static const struct _ore_r4w_op _r4w_op = {
620 .get_page = &__r4w_get_page,
621 .put_page = &__r4w_put_page,
622};
623
624static int write_exec(struct page_collect *pcol)
625{
626 struct exofs_i_info *oi = exofs_i(pcol->inode);
627 struct ore_io_state *ios;
628 struct page_collect *pcol_copy = NULL;
629 int ret;
630
631 if (!pcol->pages)
632 return 0;
633
634 BUG_ON(pcol->ios);
635 ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false,
636 pcol->pg_first << PAGE_SHIFT,
637 pcol->length, &pcol->ios);
638 if (unlikely(ret))
639 goto err;
640
641 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
642 if (!pcol_copy) {
643 EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
644 ret = -ENOMEM;
645 goto err;
646 }
647
648 *pcol_copy = *pcol;
649
650 ios = pcol->ios;
651 ios->pages = pcol_copy->pages;
652 ios->done = writepages_done;
653 ios->r4w = &_r4w_op;
654 ios->private = pcol_copy;
655
656 /* pages ownership was passed to pcol_copy */
657 _pcol_reset(pcol);
658
659 ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
660 if (unlikely(ret))
661 goto err;
662
663 EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n",
664 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
665
666 ret = ore_write(ios);
667 if (unlikely(ret)) {
668 EXOFS_ERR("write_exec: ore_write() Failed\n");
669 goto err;
670 }
671
672 atomic_inc(&pcol->sbi->s_curr_pending);
673 return 0;
674
675err:
676 if (!pcol_copy) /* Failed before ownership transfer */
677 pcol_copy = pcol;
678 _unlock_pcol_pages(pcol_copy, ret, WRITE);
679 pcol_free(pcol_copy);
680 kfree(pcol_copy);
681
682 return ret;
683}
684
685/* writepage_strip is called either directly from writepage() or by the VFS from
686 * within write_cache_pages(), to add one more page to be written to storage.
687 * It will try to collect as many contiguous pages as possible. If a
688 * discontinuity is encountered or it runs out of resources it will submit the
689 * previous segment and will start a new collection.
690 * Eventually caller must submit the last segment if present.
691 */
692static int writepage_strip(struct page *page,
693 struct writeback_control *wbc_unused, void *data)
694{
695 struct page_collect *pcol = data;
696 struct inode *inode = pcol->inode;
697 struct exofs_i_info *oi = exofs_i(inode);
698 loff_t i_size = i_size_read(inode);
699 pgoff_t end_index = i_size >> PAGE_SHIFT;
700 size_t len;
701 int ret;
702
703 BUG_ON(!PageLocked(page));
704
705 ret = wait_obj_created(oi);
706 if (unlikely(ret))
707 goto fail;
708
709 if (page->index < end_index)
710 /* in this case, the page is within the limits of the file */
711 len = PAGE_SIZE;
712 else {
713 len = i_size & ~PAGE_MASK;
714
715 if (page->index > end_index || !len) {
716 /* in this case, the page is outside the limits
717 * (truncate in progress)
718 */
719 ret = write_exec(pcol);
720 if (unlikely(ret))
721 goto fail;
722 if (PageError(page))
723 ClearPageError(page);
724 unlock_page(page);
725 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
726 "outside the limits\n",
727 inode->i_ino, page->index);
728 return 0;
729 }
730 }
731
732try_again:
733
734 if (unlikely(pcol->pg_first == -1)) {
735 pcol->pg_first = page->index;
736 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
737 page->index)) {
738 /* Discontinuity detected, split the request */
739 ret = write_exec(pcol);
740 if (unlikely(ret))
741 goto fail;
742
743 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
744 inode->i_ino, page->index);
745 goto try_again;
746 }
747
748 if (!pcol->pages) {
749 ret = pcol_try_alloc(pcol);
750 if (unlikely(ret))
751 goto fail;
752 }
753
754 EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
755 inode->i_ino, page->index, len);
756
757 ret = pcol_add_page(pcol, page, len);
758 if (unlikely(ret)) {
759 EXOFS_DBGMSG2("Failed pcol_add_page "
760 "nr_pages=%u total_length=0x%lx\n",
761 pcol->nr_pages, pcol->length);
762
763 /* split the request, next loop will start again */
764 ret = write_exec(pcol);
765 if (unlikely(ret)) {
766 EXOFS_DBGMSG("write_exec failed => %d", ret);
767 goto fail;
768 }
769
770 goto try_again;
771 }
772
773 BUG_ON(PageWriteback(page));
774 set_page_writeback(page);
775
776 return 0;
777
778fail:
779 EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
780 inode->i_ino, page->index, ret);
781 set_bit(AS_EIO, &page->mapping->flags);
782 unlock_page(page);
783 return ret;
784}
785
786static int exofs_writepages(struct address_space *mapping,
787 struct writeback_control *wbc)
788{
789 struct page_collect pcol;
790 long start, end, expected_pages;
791 int ret;
792
793 start = wbc->range_start >> PAGE_SHIFT;
794 end = (wbc->range_end == LLONG_MAX) ?
795 start + mapping->nrpages :
796 wbc->range_end >> PAGE_SHIFT;
797
798 if (start || end)
799 expected_pages = end - start + 1;
800 else
801 expected_pages = mapping->nrpages;
802
803 if (expected_pages < 32L)
804 expected_pages = 32L;
805
806 EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
807 "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
808 mapping->host->i_ino, wbc->range_start, wbc->range_end,
809 mapping->nrpages, start, end, expected_pages);
810
811 _pcol_init(&pcol, expected_pages, mapping->host);
812
813 ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
814 if (unlikely(ret)) {
815 EXOFS_ERR("write_cache_pages => %d\n", ret);
816 return ret;
817 }
818
819 ret = write_exec(&pcol);
820 if (unlikely(ret))
821 return ret;
822
823 if (wbc->sync_mode == WB_SYNC_ALL) {
824 return write_exec(&pcol); /* pump the last reminder */
825 } else if (pcol.nr_pages) {
826 /* not SYNC let the reminder join the next writeout */
827 unsigned i;
828
829 for (i = 0; i < pcol.nr_pages; i++) {
830 struct page *page = pcol.pages[i];
831
832 end_page_writeback(page);
833 set_page_dirty(page);
834 unlock_page(page);
835 }
836 }
837 return 0;
838}
839
840/*
841static int exofs_writepage(struct page *page, struct writeback_control *wbc)
842{
843 struct page_collect pcol;
844 int ret;
845
846 _pcol_init(&pcol, 1, page->mapping->host);
847
848 ret = writepage_strip(page, NULL, &pcol);
849 if (ret) {
850 EXOFS_ERR("exofs_writepage => %d\n", ret);
851 return ret;
852 }
853
854 return write_exec(&pcol);
855}
856*/
857/* i_mutex held using inode->i_size directly */
858static void _write_failed(struct inode *inode, loff_t to)
859{
860 if (to > inode->i_size)
861 truncate_pagecache(inode, inode->i_size);
862}
863
864int exofs_write_begin(struct file *file, struct address_space *mapping,
865 loff_t pos, unsigned len, unsigned flags,
866 struct page **pagep, void **fsdata)
867{
868 int ret = 0;
869 struct page *page;
870
871 page = *pagep;
872 if (page == NULL) {
873 ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
874 fsdata);
875 if (ret) {
876 EXOFS_DBGMSG("simple_write_begin failed\n");
877 goto out;
878 }
879
880 page = *pagep;
881 }
882
883 /* read modify write */
884 if (!PageUptodate(page) && (len != PAGE_SIZE)) {
885 loff_t i_size = i_size_read(mapping->host);
886 pgoff_t end_index = i_size >> PAGE_SHIFT;
887 size_t rlen;
888
889 if (page->index < end_index)
890 rlen = PAGE_SIZE;
891 else if (page->index == end_index)
892 rlen = i_size & ~PAGE_MASK;
893 else
894 rlen = 0;
895
896 if (!rlen) {
897 clear_highpage(page);
898 SetPageUptodate(page);
899 goto out;
900 }
901
902 ret = _readpage(page, true);
903 if (ret) {
904 /*SetPageError was done by _readpage. Is it ok?*/
905 unlock_page(page);
906 EXOFS_DBGMSG("__readpage failed\n");
907 }
908 }
909out:
910 if (unlikely(ret))
911 _write_failed(mapping->host, pos + len);
912
913 return ret;
914}
915
916static int exofs_write_begin_export(struct file *file,
917 struct address_space *mapping,
918 loff_t pos, unsigned len, unsigned flags,
919 struct page **pagep, void **fsdata)
920{
921 *pagep = NULL;
922
923 return exofs_write_begin(file, mapping, pos, len, flags, pagep,
924 fsdata);
925}
926
927static int exofs_write_end(struct file *file, struct address_space *mapping,
928 loff_t pos, unsigned len, unsigned copied,
929 struct page *page, void *fsdata)
930{
931 struct inode *inode = mapping->host;
932 /* According to comment in simple_write_end i_mutex is held */
933 loff_t i_size = inode->i_size;
934 int ret;
935
936 ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
937 if (unlikely(ret))
938 _write_failed(inode, pos + len);
939
940 /* TODO: once simple_write_end marks inode dirty remove */
941 if (i_size != inode->i_size)
942 mark_inode_dirty(inode);
943 return ret;
944}
945
946static int exofs_releasepage(struct page *page, gfp_t gfp)
947{
948 EXOFS_DBGMSG("page 0x%lx\n", page->index);
949 WARN_ON(1);
950 return 0;
951}
952
953static void exofs_invalidatepage(struct page *page, unsigned int offset,
954 unsigned int length)
955{
956 EXOFS_DBGMSG("page 0x%lx offset 0x%x length 0x%x\n",
957 page->index, offset, length);
958 WARN_ON(1);
959}
960
961
962 /* TODO: Should be easy enough to do proprly */
963static ssize_t exofs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
964 loff_t offset)
965{
966 return 0;
967}
968
969const struct address_space_operations exofs_aops = {
970 .readpage = exofs_readpage,
971 .readpages = exofs_readpages,
972 .writepage = NULL,
973 .writepages = exofs_writepages,
974 .write_begin = exofs_write_begin_export,
975 .write_end = exofs_write_end,
976 .releasepage = exofs_releasepage,
977 .set_page_dirty = __set_page_dirty_nobuffers,
978 .invalidatepage = exofs_invalidatepage,
979
980 /* Not implemented Yet */
981 .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
982 .direct_IO = exofs_direct_IO,
983
984 /* With these NULL has special meaning or default is not exported */
985 .migratepage = NULL,
986 .launder_page = NULL,
987 .is_partially_uptodate = NULL,
988 .error_remove_page = NULL,
989};
990
991/******************************************************************************
992 * INODE OPERATIONS
993 *****************************************************************************/
994
995/*
996 * Test whether an inode is a fast symlink.
997 */
998static inline int exofs_inode_is_fast_symlink(struct inode *inode)
999{
1000 struct exofs_i_info *oi = exofs_i(inode);
1001
1002 return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
1003}
1004
1005static int _do_truncate(struct inode *inode, loff_t newsize)
1006{
1007 struct exofs_i_info *oi = exofs_i(inode);
1008 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1009 int ret;
1010
1011 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1012
1013 ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize);
1014 if (likely(!ret))
1015 truncate_setsize(inode, newsize);
1016
1017 EXOFS_DBGMSG2("(0x%lx) size=0x%llx ret=>%d\n",
1018 inode->i_ino, newsize, ret);
1019 return ret;
1020}
1021
1022/*
1023 * Set inode attributes - update size attribute on OSD if needed,
1024 * otherwise just call generic functions.
1025 */
1026int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
1027{
1028 struct inode *inode = d_inode(dentry);
1029 int error;
1030
1031 /* if we are about to modify an object, and it hasn't been
1032 * created yet, wait
1033 */
1034 error = wait_obj_created(exofs_i(inode));
1035 if (unlikely(error))
1036 return error;
1037
1038 error = inode_change_ok(inode, iattr);
1039 if (unlikely(error))
1040 return error;
1041
1042 if ((iattr->ia_valid & ATTR_SIZE) &&
1043 iattr->ia_size != i_size_read(inode)) {
1044 error = _do_truncate(inode, iattr->ia_size);
1045 if (unlikely(error))
1046 return error;
1047 }
1048
1049 setattr_copy(inode, iattr);
1050 mark_inode_dirty(inode);
1051 return 0;
1052}
1053
1054static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
1055 EXOFS_APAGE_FS_DATA,
1056 EXOFS_ATTR_INODE_FILE_LAYOUT,
1057 0);
1058static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
1059 EXOFS_APAGE_FS_DATA,
1060 EXOFS_ATTR_INODE_DIR_LAYOUT,
1061 0);
1062
1063/*
1064 * Read the Linux inode info from the OSD, and return it as is. In exofs the
1065 * inode info is in an application specific page/attribute of the osd-object.
1066 */
1067static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
1068 struct exofs_fcb *inode)
1069{
1070 struct exofs_sb_info *sbi = sb->s_fs_info;
1071 struct osd_attr attrs[] = {
1072 [0] = g_attr_inode_data,
1073 [1] = g_attr_inode_file_layout,
1074 [2] = g_attr_inode_dir_layout,
1075 };
1076 struct ore_io_state *ios;
1077 struct exofs_on_disk_inode_layout *layout;
1078 int ret;
1079
1080 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1081 if (unlikely(ret)) {
1082 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1083 return ret;
1084 }
1085
1086 attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1087 attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1088
1089 ios->in_attr = attrs;
1090 ios->in_attr_len = ARRAY_SIZE(attrs);
1091
1092 ret = ore_read(ios);
1093 if (unlikely(ret)) {
1094 EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
1095 _LLU(oi->one_comp.obj.id), ret);
1096 memset(inode, 0, sizeof(*inode));
1097 inode->i_mode = 0040000 | (0777 & ~022);
1098 /* If object is lost on target we might as well enable it's
1099 * delete.
1100 */
1101 ret = 0;
1102 goto out;
1103 }
1104
1105 ret = extract_attr_from_ios(ios, &attrs[0]);
1106 if (ret) {
1107 EXOFS_ERR("%s: extract_attr 0 of inode failed\n", __func__);
1108 goto out;
1109 }
1110 WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
1111 memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
1112
1113 ret = extract_attr_from_ios(ios, &attrs[1]);
1114 if (ret) {
1115 EXOFS_ERR("%s: extract_attr 1 of inode failed\n", __func__);
1116 goto out;
1117 }
1118 if (attrs[1].len) {
1119 layout = attrs[1].val_ptr;
1120 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1121 EXOFS_ERR("%s: unsupported files layout %d\n",
1122 __func__, layout->gen_func);
1123 ret = -ENOTSUPP;
1124 goto out;
1125 }
1126 }
1127
1128 ret = extract_attr_from_ios(ios, &attrs[2]);
1129 if (ret) {
1130 EXOFS_ERR("%s: extract_attr 2 of inode failed\n", __func__);
1131 goto out;
1132 }
1133 if (attrs[2].len) {
1134 layout = attrs[2].val_ptr;
1135 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1136 EXOFS_ERR("%s: unsupported meta-data layout %d\n",
1137 __func__, layout->gen_func);
1138 ret = -ENOTSUPP;
1139 goto out;
1140 }
1141 }
1142
1143out:
1144 ore_put_io_state(ios);
1145 return ret;
1146}
1147
1148static void __oi_init(struct exofs_i_info *oi)
1149{
1150 init_waitqueue_head(&oi->i_wq);
1151 oi->i_flags = 0;
1152}
1153/*
1154 * Fill in an inode read from the OSD and set it up for use
1155 */
1156struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
1157{
1158 struct exofs_i_info *oi;
1159 struct exofs_fcb fcb;
1160 struct inode *inode;
1161 int ret;
1162
1163 inode = iget_locked(sb, ino);
1164 if (!inode)
1165 return ERR_PTR(-ENOMEM);
1166 if (!(inode->i_state & I_NEW))
1167 return inode;
1168 oi = exofs_i(inode);
1169 __oi_init(oi);
1170 exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1171 exofs_oi_objno(oi));
1172
1173 /* read the inode from the osd */
1174 ret = exofs_get_inode(sb, oi, &fcb);
1175 if (ret)
1176 goto bad_inode;
1177
1178 set_obj_created(oi);
1179
1180 /* copy stuff from on-disk struct to in-memory struct */
1181 inode->i_mode = le16_to_cpu(fcb.i_mode);
1182 i_uid_write(inode, le32_to_cpu(fcb.i_uid));
1183 i_gid_write(inode, le32_to_cpu(fcb.i_gid));
1184 set_nlink(inode, le16_to_cpu(fcb.i_links_count));
1185 inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
1186 inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
1187 inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
1188 inode->i_ctime.tv_nsec =
1189 inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
1190 oi->i_commit_size = le64_to_cpu(fcb.i_size);
1191 i_size_write(inode, oi->i_commit_size);
1192 inode->i_blkbits = EXOFS_BLKSHIFT;
1193 inode->i_generation = le32_to_cpu(fcb.i_generation);
1194
1195 oi->i_dir_start_lookup = 0;
1196
1197 if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
1198 ret = -ESTALE;
1199 goto bad_inode;
1200 }
1201
1202 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1203 if (fcb.i_data[0])
1204 inode->i_rdev =
1205 old_decode_dev(le32_to_cpu(fcb.i_data[0]));
1206 else
1207 inode->i_rdev =
1208 new_decode_dev(le32_to_cpu(fcb.i_data[1]));
1209 } else {
1210 memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
1211 }
1212
1213 if (S_ISREG(inode->i_mode)) {
1214 inode->i_op = &exofs_file_inode_operations;
1215 inode->i_fop = &exofs_file_operations;
1216 inode->i_mapping->a_ops = &exofs_aops;
1217 } else if (S_ISDIR(inode->i_mode)) {
1218 inode->i_op = &exofs_dir_inode_operations;
1219 inode->i_fop = &exofs_dir_operations;
1220 inode->i_mapping->a_ops = &exofs_aops;
1221 } else if (S_ISLNK(inode->i_mode)) {
1222 if (exofs_inode_is_fast_symlink(inode)) {
1223 inode->i_op = &simple_symlink_inode_operations;
1224 inode->i_link = (char *)oi->i_data;
1225 } else {
1226 inode->i_op = &page_symlink_inode_operations;
1227 inode_nohighmem(inode);
1228 inode->i_mapping->a_ops = &exofs_aops;
1229 }
1230 } else {
1231 inode->i_op = &exofs_special_inode_operations;
1232 if (fcb.i_data[0])
1233 init_special_inode(inode, inode->i_mode,
1234 old_decode_dev(le32_to_cpu(fcb.i_data[0])));
1235 else
1236 init_special_inode(inode, inode->i_mode,
1237 new_decode_dev(le32_to_cpu(fcb.i_data[1])));
1238 }
1239
1240 unlock_new_inode(inode);
1241 return inode;
1242
1243bad_inode:
1244 iget_failed(inode);
1245 return ERR_PTR(ret);
1246}
1247
1248int __exofs_wait_obj_created(struct exofs_i_info *oi)
1249{
1250 if (!obj_created(oi)) {
1251 EXOFS_DBGMSG("!obj_created\n");
1252 BUG_ON(!obj_2bcreated(oi));
1253 wait_event(oi->i_wq, obj_created(oi));
1254 EXOFS_DBGMSG("wait_event done\n");
1255 }
1256 return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
1257}
1258
1259/*
1260 * Callback function from exofs_new_inode(). The important thing is that we
1261 * set the obj_created flag so that other methods know that the object exists on
1262 * the OSD.
1263 */
1264static void create_done(struct ore_io_state *ios, void *p)
1265{
1266 struct inode *inode = p;
1267 struct exofs_i_info *oi = exofs_i(inode);
1268 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1269 int ret;
1270
1271 ret = ore_check_io(ios, NULL);
1272 ore_put_io_state(ios);
1273
1274 atomic_dec(&sbi->s_curr_pending);
1275
1276 if (unlikely(ret)) {
1277 EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx",
1278 _LLU(exofs_oi_objno(oi)),
1279 _LLU(oi->one_comp.obj.partition));
1280 /*TODO: When FS is corrupted creation can fail, object already
1281 * exist. Get rid of this asynchronous creation, if exist
1282 * increment the obj counter and try the next object. Until we
1283 * succeed. All these dangling objects will be made into lost
1284 * files by chkfs.exofs
1285 */
1286 }
1287
1288 set_obj_created(oi);
1289
1290 wake_up(&oi->i_wq);
1291}
1292
1293/*
1294 * Set up a new inode and create an object for it on the OSD
1295 */
1296struct inode *exofs_new_inode(struct inode *dir, umode_t mode)
1297{
1298 struct super_block *sb = dir->i_sb;
1299 struct exofs_sb_info *sbi = sb->s_fs_info;
1300 struct inode *inode;
1301 struct exofs_i_info *oi;
1302 struct ore_io_state *ios;
1303 int ret;
1304
1305 inode = new_inode(sb);
1306 if (!inode)
1307 return ERR_PTR(-ENOMEM);
1308
1309 oi = exofs_i(inode);
1310 __oi_init(oi);
1311
1312 set_obj_2bcreated(oi);
1313
1314 inode_init_owner(inode, dir, mode);
1315 inode->i_ino = sbi->s_nextid++;
1316 inode->i_blkbits = EXOFS_BLKSHIFT;
1317 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1318 oi->i_commit_size = inode->i_size = 0;
1319 spin_lock(&sbi->s_next_gen_lock);
1320 inode->i_generation = sbi->s_next_generation++;
1321 spin_unlock(&sbi->s_next_gen_lock);
1322 insert_inode_hash(inode);
1323
1324 exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1325 exofs_oi_objno(oi));
1326 exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
1327
1328 mark_inode_dirty(inode);
1329
1330 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1331 if (unlikely(ret)) {
1332 EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n");
1333 return ERR_PTR(ret);
1334 }
1335
1336 ios->done = create_done;
1337 ios->private = inode;
1338
1339 ret = ore_create(ios);
1340 if (ret) {
1341 ore_put_io_state(ios);
1342 return ERR_PTR(ret);
1343 }
1344 atomic_inc(&sbi->s_curr_pending);
1345
1346 return inode;
1347}
1348
1349/*
1350 * struct to pass two arguments to update_inode's callback
1351 */
1352struct updatei_args {
1353 struct exofs_sb_info *sbi;
1354 struct exofs_fcb fcb;
1355};
1356
1357/*
1358 * Callback function from exofs_update_inode().
1359 */
1360static void updatei_done(struct ore_io_state *ios, void *p)
1361{
1362 struct updatei_args *args = p;
1363
1364 ore_put_io_state(ios);
1365
1366 atomic_dec(&args->sbi->s_curr_pending);
1367
1368 kfree(args);
1369}
1370
1371/*
1372 * Write the inode to the OSD. Just fill up the struct, and set the attribute
1373 * synchronously or asynchronously depending on the do_sync flag.
1374 */
1375static int exofs_update_inode(struct inode *inode, int do_sync)
1376{
1377 struct exofs_i_info *oi = exofs_i(inode);
1378 struct super_block *sb = inode->i_sb;
1379 struct exofs_sb_info *sbi = sb->s_fs_info;
1380 struct ore_io_state *ios;
1381 struct osd_attr attr;
1382 struct exofs_fcb *fcb;
1383 struct updatei_args *args;
1384 int ret;
1385
1386 args = kzalloc(sizeof(*args), GFP_KERNEL);
1387 if (!args) {
1388 EXOFS_DBGMSG("Failed kzalloc of args\n");
1389 return -ENOMEM;
1390 }
1391
1392 fcb = &args->fcb;
1393
1394 fcb->i_mode = cpu_to_le16(inode->i_mode);
1395 fcb->i_uid = cpu_to_le32(i_uid_read(inode));
1396 fcb->i_gid = cpu_to_le32(i_gid_read(inode));
1397 fcb->i_links_count = cpu_to_le16(inode->i_nlink);
1398 fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
1399 fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
1400 fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
1401 oi->i_commit_size = i_size_read(inode);
1402 fcb->i_size = cpu_to_le64(oi->i_commit_size);
1403 fcb->i_generation = cpu_to_le32(inode->i_generation);
1404
1405 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1406 if (old_valid_dev(inode->i_rdev)) {
1407 fcb->i_data[0] =
1408 cpu_to_le32(old_encode_dev(inode->i_rdev));
1409 fcb->i_data[1] = 0;
1410 } else {
1411 fcb->i_data[0] = 0;
1412 fcb->i_data[1] =
1413 cpu_to_le32(new_encode_dev(inode->i_rdev));
1414 fcb->i_data[2] = 0;
1415 }
1416 } else
1417 memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
1418
1419 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1420 if (unlikely(ret)) {
1421 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1422 goto free_args;
1423 }
1424
1425 attr = g_attr_inode_data;
1426 attr.val_ptr = fcb;
1427 ios->out_attr_len = 1;
1428 ios->out_attr = &attr;
1429
1430 wait_obj_created(oi);
1431
1432 if (!do_sync) {
1433 args->sbi = sbi;
1434 ios->done = updatei_done;
1435 ios->private = args;
1436 }
1437
1438 ret = ore_write(ios);
1439 if (!do_sync && !ret) {
1440 atomic_inc(&sbi->s_curr_pending);
1441 goto out; /* deallocation in updatei_done */
1442 }
1443
1444 ore_put_io_state(ios);
1445free_args:
1446 kfree(args);
1447out:
1448 EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
1449 inode->i_ino, do_sync, ret);
1450 return ret;
1451}
1452
1453int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
1454{
1455 /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */
1456 return exofs_update_inode(inode, 1);
1457}
1458
1459/*
1460 * Callback function from exofs_delete_inode() - don't have much cleaning up to
1461 * do.
1462 */
1463static void delete_done(struct ore_io_state *ios, void *p)
1464{
1465 struct exofs_sb_info *sbi = p;
1466
1467 ore_put_io_state(ios);
1468
1469 atomic_dec(&sbi->s_curr_pending);
1470}
1471
1472/*
1473 * Called when the refcount of an inode reaches zero. We remove the object
1474 * from the OSD here. We make sure the object was created before we try and
1475 * delete it.
1476 */
1477void exofs_evict_inode(struct inode *inode)
1478{
1479 struct exofs_i_info *oi = exofs_i(inode);
1480 struct super_block *sb = inode->i_sb;
1481 struct exofs_sb_info *sbi = sb->s_fs_info;
1482 struct ore_io_state *ios;
1483 int ret;
1484
1485 truncate_inode_pages_final(&inode->i_data);
1486
1487 /* TODO: should do better here */
1488 if (inode->i_nlink || is_bad_inode(inode))
1489 goto no_delete;
1490
1491 inode->i_size = 0;
1492 clear_inode(inode);
1493
1494 /* if we are deleting an obj that hasn't been created yet, wait.
1495 * This also makes sure that create_done cannot be called with an
1496 * already evicted inode.
1497 */
1498 wait_obj_created(oi);
1499 /* ignore the error, attempt a remove anyway */
1500
1501 /* Now Remove the OSD objects */
1502 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1503 if (unlikely(ret)) {
1504 EXOFS_ERR("%s: ore_get_io_state failed\n", __func__);
1505 return;
1506 }
1507
1508 ios->done = delete_done;
1509 ios->private = sbi;
1510
1511 ret = ore_remove(ios);
1512 if (ret) {
1513 EXOFS_ERR("%s: ore_remove failed\n", __func__);
1514 ore_put_io_state(ios);
1515 return;
1516 }
1517 atomic_inc(&sbi->s_curr_pending);
1518
1519 return;
1520
1521no_delete:
1522 clear_inode(inode);
1523}
1/*
2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
6 *
7 * Copyrights for code taken from ext2:
8 * Copyright (C) 1992, 1993, 1994, 1995
9 * Remy Card (card@masi.ibp.fr)
10 * Laboratoire MASI - Institut Blaise Pascal
11 * Universite Pierre et Marie Curie (Paris VI)
12 * from
13 * linux/fs/minix/inode.c
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * This file is part of exofs.
17 *
18 * exofs is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation. Since it is based on ext2, and the only
21 * valid version of GPL for the Linux kernel is version 2, the only valid
22 * version of GPL for exofs is version 2.
23 *
24 * exofs is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with exofs; if not, write to the Free Software
31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
32 */
33
34#include <linux/slab.h>
35
36#include "exofs.h"
37
38#define EXOFS_DBGMSG2(M...) do {} while (0)
39
40enum {MAX_PAGES_KMALLOC = PAGE_SIZE / sizeof(struct page *), };
41
42unsigned exofs_max_io_pages(struct ore_layout *layout,
43 unsigned expected_pages)
44{
45 unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC);
46
47 /* TODO: easily support bio chaining */
48 pages = min_t(unsigned, pages, layout->max_io_length / PAGE_SIZE);
49 return pages;
50}
51
52struct page_collect {
53 struct exofs_sb_info *sbi;
54 struct inode *inode;
55 unsigned expected_pages;
56 struct ore_io_state *ios;
57
58 struct page **pages;
59 unsigned alloc_pages;
60 unsigned nr_pages;
61 unsigned long length;
62 loff_t pg_first; /* keep 64bit also in 32-arches */
63 bool read_4_write; /* This means two things: that the read is sync
64 * And the pages should not be unlocked.
65 */
66 struct page *that_locked_page;
67};
68
69static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
70 struct inode *inode)
71{
72 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
73
74 pcol->sbi = sbi;
75 pcol->inode = inode;
76 pcol->expected_pages = expected_pages;
77
78 pcol->ios = NULL;
79 pcol->pages = NULL;
80 pcol->alloc_pages = 0;
81 pcol->nr_pages = 0;
82 pcol->length = 0;
83 pcol->pg_first = -1;
84 pcol->read_4_write = false;
85 pcol->that_locked_page = NULL;
86}
87
88static void _pcol_reset(struct page_collect *pcol)
89{
90 pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
91
92 pcol->pages = NULL;
93 pcol->alloc_pages = 0;
94 pcol->nr_pages = 0;
95 pcol->length = 0;
96 pcol->pg_first = -1;
97 pcol->ios = NULL;
98 pcol->that_locked_page = NULL;
99
100 /* this is probably the end of the loop but in writes
101 * it might not end here. don't be left with nothing
102 */
103 if (!pcol->expected_pages)
104 pcol->expected_pages = MAX_PAGES_KMALLOC;
105}
106
107static int pcol_try_alloc(struct page_collect *pcol)
108{
109 unsigned pages;
110
111 /* TODO: easily support bio chaining */
112 pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages);
113
114 for (; pages; pages >>= 1) {
115 pcol->pages = kmalloc(pages * sizeof(struct page *),
116 GFP_KERNEL);
117 if (likely(pcol->pages)) {
118 pcol->alloc_pages = pages;
119 return 0;
120 }
121 }
122
123 EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
124 pcol->expected_pages);
125 return -ENOMEM;
126}
127
128static void pcol_free(struct page_collect *pcol)
129{
130 kfree(pcol->pages);
131 pcol->pages = NULL;
132
133 if (pcol->ios) {
134 ore_put_io_state(pcol->ios);
135 pcol->ios = NULL;
136 }
137}
138
139static int pcol_add_page(struct page_collect *pcol, struct page *page,
140 unsigned len)
141{
142 if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
143 return -ENOMEM;
144
145 pcol->pages[pcol->nr_pages++] = page;
146 pcol->length += len;
147 return 0;
148}
149
150enum {PAGE_WAS_NOT_IN_IO = 17};
151static int update_read_page(struct page *page, int ret)
152{
153 switch (ret) {
154 case 0:
155 /* Everything is OK */
156 SetPageUptodate(page);
157 if (PageError(page))
158 ClearPageError(page);
159 break;
160 case -EFAULT:
161 /* In this case we were trying to read something that wasn't on
162 * disk yet - return a page full of zeroes. This should be OK,
163 * because the object should be empty (if there was a write
164 * before this read, the read would be waiting with the page
165 * locked */
166 clear_highpage(page);
167
168 SetPageUptodate(page);
169 if (PageError(page))
170 ClearPageError(page);
171 EXOFS_DBGMSG("recovered read error\n");
172 /* fall through */
173 case PAGE_WAS_NOT_IN_IO:
174 ret = 0; /* recovered error */
175 break;
176 default:
177 SetPageError(page);
178 }
179 return ret;
180}
181
182static void update_write_page(struct page *page, int ret)
183{
184 if (unlikely(ret == PAGE_WAS_NOT_IN_IO))
185 return; /* don't pass start don't collect $200 */
186
187 if (ret) {
188 mapping_set_error(page->mapping, ret);
189 SetPageError(page);
190 }
191 end_page_writeback(page);
192}
193
194/* Called at the end of reads, to optionally unlock pages and update their
195 * status.
196 */
197static int __readpages_done(struct page_collect *pcol)
198{
199 int i;
200 u64 good_bytes;
201 u64 length = 0;
202 int ret = ore_check_io(pcol->ios, NULL);
203
204 if (likely(!ret)) {
205 good_bytes = pcol->length;
206 ret = PAGE_WAS_NOT_IN_IO;
207 } else {
208 good_bytes = 0;
209 }
210
211 EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
212 " length=0x%lx nr_pages=%u\n",
213 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
214 pcol->nr_pages);
215
216 for (i = 0; i < pcol->nr_pages; i++) {
217 struct page *page = pcol->pages[i];
218 struct inode *inode = page->mapping->host;
219 int page_stat;
220
221 if (inode != pcol->inode)
222 continue; /* osd might add more pages at end */
223
224 if (likely(length < good_bytes))
225 page_stat = 0;
226 else
227 page_stat = ret;
228
229 EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n",
230 inode->i_ino, page->index,
231 page_stat ? "bad_bytes" : "good_bytes");
232
233 ret = update_read_page(page, page_stat);
234 if (!pcol->read_4_write)
235 unlock_page(page);
236 length += PAGE_SIZE;
237 }
238
239 pcol_free(pcol);
240 EXOFS_DBGMSG2("readpages_done END\n");
241 return ret;
242}
243
244/* callback of async reads */
245static void readpages_done(struct ore_io_state *ios, void *p)
246{
247 struct page_collect *pcol = p;
248
249 __readpages_done(pcol);
250 atomic_dec(&pcol->sbi->s_curr_pending);
251 kfree(pcol);
252}
253
254static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
255{
256 int i;
257
258 for (i = 0; i < pcol->nr_pages; i++) {
259 struct page *page = pcol->pages[i];
260
261 if (rw == READ)
262 update_read_page(page, ret);
263 else
264 update_write_page(page, ret);
265
266 unlock_page(page);
267 }
268}
269
270static int _maybe_not_all_in_one_io(struct ore_io_state *ios,
271 struct page_collect *pcol_src, struct page_collect *pcol)
272{
273 /* length was wrong or offset was not page aligned */
274 BUG_ON(pcol_src->nr_pages < ios->nr_pages);
275
276 if (pcol_src->nr_pages > ios->nr_pages) {
277 struct page **src_page;
278 unsigned pages_less = pcol_src->nr_pages - ios->nr_pages;
279 unsigned long len_less = pcol_src->length - ios->length;
280 unsigned i;
281 int ret;
282
283 /* This IO was trimmed */
284 pcol_src->nr_pages = ios->nr_pages;
285 pcol_src->length = ios->length;
286
287 /* Left over pages are passed to the next io */
288 pcol->expected_pages += pages_less;
289 pcol->nr_pages = pages_less;
290 pcol->length = len_less;
291 src_page = pcol_src->pages + pcol_src->nr_pages;
292 pcol->pg_first = (*src_page)->index;
293
294 ret = pcol_try_alloc(pcol);
295 if (unlikely(ret))
296 return ret;
297
298 for (i = 0; i < pages_less; ++i)
299 pcol->pages[i] = *src_page++;
300
301 EXOFS_DBGMSG("Length was adjusted nr_pages=0x%x "
302 "pages_less=0x%x expected_pages=0x%x "
303 "next_offset=0x%llx next_len=0x%lx\n",
304 pcol_src->nr_pages, pages_less, pcol->expected_pages,
305 pcol->pg_first * PAGE_SIZE, pcol->length);
306 }
307 return 0;
308}
309
310static int read_exec(struct page_collect *pcol)
311{
312 struct exofs_i_info *oi = exofs_i(pcol->inode);
313 struct ore_io_state *ios;
314 struct page_collect *pcol_copy = NULL;
315 int ret;
316
317 if (!pcol->pages)
318 return 0;
319
320 if (!pcol->ios) {
321 int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true,
322 pcol->pg_first << PAGE_CACHE_SHIFT,
323 pcol->length, &pcol->ios);
324
325 if (ret)
326 return ret;
327 }
328
329 ios = pcol->ios;
330 ios->pages = pcol->pages;
331
332 if (pcol->read_4_write) {
333 ore_read(pcol->ios);
334 return __readpages_done(pcol);
335 }
336
337 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
338 if (!pcol_copy) {
339 ret = -ENOMEM;
340 goto err;
341 }
342
343 *pcol_copy = *pcol;
344 ios->done = readpages_done;
345 ios->private = pcol_copy;
346
347 /* pages ownership was passed to pcol_copy */
348 _pcol_reset(pcol);
349
350 ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
351 if (unlikely(ret))
352 goto err;
353
354 EXOFS_DBGMSG2("read_exec(0x%lx) offset=0x%llx length=0x%llx\n",
355 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
356
357 ret = ore_read(ios);
358 if (unlikely(ret))
359 goto err;
360
361 atomic_inc(&pcol->sbi->s_curr_pending);
362
363 return 0;
364
365err:
366 if (!pcol->read_4_write)
367 _unlock_pcol_pages(pcol, ret, READ);
368
369 pcol_free(pcol);
370
371 kfree(pcol_copy);
372 return ret;
373}
374
375/* readpage_strip is called either directly from readpage() or by the VFS from
376 * within read_cache_pages(), to add one more page to be read. It will try to
377 * collect as many contiguous pages as posible. If a discontinuity is
378 * encountered, or it runs out of resources, it will submit the previous segment
379 * and will start a new collection. Eventually caller must submit the last
380 * segment if present.
381 */
382static int readpage_strip(void *data, struct page *page)
383{
384 struct page_collect *pcol = data;
385 struct inode *inode = pcol->inode;
386 struct exofs_i_info *oi = exofs_i(inode);
387 loff_t i_size = i_size_read(inode);
388 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
389 size_t len;
390 int ret;
391
392 /* FIXME: Just for debugging, will be removed */
393 if (PageUptodate(page))
394 EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
395 page->index);
396
397 pcol->that_locked_page = page;
398
399 if (page->index < end_index)
400 len = PAGE_CACHE_SIZE;
401 else if (page->index == end_index)
402 len = i_size & ~PAGE_CACHE_MASK;
403 else
404 len = 0;
405
406 if (!len || !obj_created(oi)) {
407 /* this will be out of bounds, or doesn't exist yet.
408 * Current page is cleared and the request is split
409 */
410 clear_highpage(page);
411
412 SetPageUptodate(page);
413 if (PageError(page))
414 ClearPageError(page);
415
416 if (!pcol->read_4_write)
417 unlock_page(page);
418 EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx "
419 "read_4_write=%d index=0x%lx end_index=0x%lx "
420 "splitting\n", inode->i_ino, len,
421 pcol->read_4_write, page->index, end_index);
422
423 return read_exec(pcol);
424 }
425
426try_again:
427
428 if (unlikely(pcol->pg_first == -1)) {
429 pcol->pg_first = page->index;
430 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
431 page->index)) {
432 /* Discontinuity detected, split the request */
433 ret = read_exec(pcol);
434 if (unlikely(ret))
435 goto fail;
436 goto try_again;
437 }
438
439 if (!pcol->pages) {
440 ret = pcol_try_alloc(pcol);
441 if (unlikely(ret))
442 goto fail;
443 }
444
445 if (len != PAGE_CACHE_SIZE)
446 zero_user(page, len, PAGE_CACHE_SIZE - len);
447
448 EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
449 inode->i_ino, page->index, len);
450
451 ret = pcol_add_page(pcol, page, len);
452 if (ret) {
453 EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
454 "this_len=0x%zx nr_pages=%u length=0x%lx\n",
455 page, len, pcol->nr_pages, pcol->length);
456
457 /* split the request, and start again with current page */
458 ret = read_exec(pcol);
459 if (unlikely(ret))
460 goto fail;
461
462 goto try_again;
463 }
464
465 return 0;
466
467fail:
468 /* SetPageError(page); ??? */
469 unlock_page(page);
470 return ret;
471}
472
473static int exofs_readpages(struct file *file, struct address_space *mapping,
474 struct list_head *pages, unsigned nr_pages)
475{
476 struct page_collect pcol;
477 int ret;
478
479 _pcol_init(&pcol, nr_pages, mapping->host);
480
481 ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
482 if (ret) {
483 EXOFS_ERR("read_cache_pages => %d\n", ret);
484 return ret;
485 }
486
487 ret = read_exec(&pcol);
488 if (unlikely(ret))
489 return ret;
490
491 return read_exec(&pcol);
492}
493
494static int _readpage(struct page *page, bool read_4_write)
495{
496 struct page_collect pcol;
497 int ret;
498
499 _pcol_init(&pcol, 1, page->mapping->host);
500
501 pcol.read_4_write = read_4_write;
502 ret = readpage_strip(&pcol, page);
503 if (ret) {
504 EXOFS_ERR("_readpage => %d\n", ret);
505 return ret;
506 }
507
508 return read_exec(&pcol);
509}
510
511/*
512 * We don't need the file
513 */
514static int exofs_readpage(struct file *file, struct page *page)
515{
516 return _readpage(page, false);
517}
518
519/* Callback for osd_write. All writes are asynchronous */
520static void writepages_done(struct ore_io_state *ios, void *p)
521{
522 struct page_collect *pcol = p;
523 int i;
524 u64 good_bytes;
525 u64 length = 0;
526 int ret = ore_check_io(ios, NULL);
527
528 atomic_dec(&pcol->sbi->s_curr_pending);
529
530 if (likely(!ret)) {
531 good_bytes = pcol->length;
532 ret = PAGE_WAS_NOT_IN_IO;
533 } else {
534 good_bytes = 0;
535 }
536
537 EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
538 " length=0x%lx nr_pages=%u\n",
539 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
540 pcol->nr_pages);
541
542 for (i = 0; i < pcol->nr_pages; i++) {
543 struct page *page = pcol->pages[i];
544 struct inode *inode = page->mapping->host;
545 int page_stat;
546
547 if (inode != pcol->inode)
548 continue; /* osd might add more pages to a bio */
549
550 if (likely(length < good_bytes))
551 page_stat = 0;
552 else
553 page_stat = ret;
554
555 update_write_page(page, page_stat);
556 unlock_page(page);
557 EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n",
558 inode->i_ino, page->index, page_stat);
559
560 length += PAGE_SIZE;
561 }
562
563 pcol_free(pcol);
564 kfree(pcol);
565 EXOFS_DBGMSG2("writepages_done END\n");
566}
567
568static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate)
569{
570 struct page_collect *pcol = priv;
571 pgoff_t index = offset / PAGE_SIZE;
572
573 if (!pcol->that_locked_page ||
574 (pcol->that_locked_page->index != index)) {
575 struct page *page = find_get_page(pcol->inode->i_mapping, index);
576
577 if (!page) {
578 page = find_or_create_page(pcol->inode->i_mapping,
579 index, GFP_NOFS);
580 if (unlikely(!page)) {
581 EXOFS_DBGMSG("grab_cache_page Failed "
582 "index=0x%llx\n", _LLU(index));
583 return NULL;
584 }
585 unlock_page(page);
586 }
587 if (PageDirty(page) || PageWriteback(page))
588 *uptodate = true;
589 else
590 *uptodate = PageUptodate(page);
591 EXOFS_DBGMSG("index=0x%lx uptodate=%d\n", index, *uptodate);
592 return page;
593 } else {
594 EXOFS_DBGMSG("YES that_locked_page index=0x%lx\n",
595 pcol->that_locked_page->index);
596 *uptodate = true;
597 return pcol->that_locked_page;
598 }
599}
600
601static void __r4w_put_page(void *priv, struct page *page)
602{
603 struct page_collect *pcol = priv;
604
605 if (pcol->that_locked_page != page) {
606 EXOFS_DBGMSG("index=0x%lx\n", page->index);
607 page_cache_release(page);
608 return;
609 }
610 EXOFS_DBGMSG("that_locked_page index=0x%lx\n", page->index);
611}
612
613static const struct _ore_r4w_op _r4w_op = {
614 .get_page = &__r4w_get_page,
615 .put_page = &__r4w_put_page,
616};
617
618static int write_exec(struct page_collect *pcol)
619{
620 struct exofs_i_info *oi = exofs_i(pcol->inode);
621 struct ore_io_state *ios;
622 struct page_collect *pcol_copy = NULL;
623 int ret;
624
625 if (!pcol->pages)
626 return 0;
627
628 BUG_ON(pcol->ios);
629 ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false,
630 pcol->pg_first << PAGE_CACHE_SHIFT,
631 pcol->length, &pcol->ios);
632 if (unlikely(ret))
633 goto err;
634
635 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
636 if (!pcol_copy) {
637 EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
638 ret = -ENOMEM;
639 goto err;
640 }
641
642 *pcol_copy = *pcol;
643
644 ios = pcol->ios;
645 ios->pages = pcol_copy->pages;
646 ios->done = writepages_done;
647 ios->r4w = &_r4w_op;
648 ios->private = pcol_copy;
649
650 /* pages ownership was passed to pcol_copy */
651 _pcol_reset(pcol);
652
653 ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
654 if (unlikely(ret))
655 goto err;
656
657 EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n",
658 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
659
660 ret = ore_write(ios);
661 if (unlikely(ret)) {
662 EXOFS_ERR("write_exec: ore_write() Failed\n");
663 goto err;
664 }
665
666 atomic_inc(&pcol->sbi->s_curr_pending);
667 return 0;
668
669err:
670 _unlock_pcol_pages(pcol, ret, WRITE);
671 pcol_free(pcol);
672 kfree(pcol_copy);
673
674 return ret;
675}
676
677/* writepage_strip is called either directly from writepage() or by the VFS from
678 * within write_cache_pages(), to add one more page to be written to storage.
679 * It will try to collect as many contiguous pages as possible. If a
680 * discontinuity is encountered or it runs out of resources it will submit the
681 * previous segment and will start a new collection.
682 * Eventually caller must submit the last segment if present.
683 */
684static int writepage_strip(struct page *page,
685 struct writeback_control *wbc_unused, void *data)
686{
687 struct page_collect *pcol = data;
688 struct inode *inode = pcol->inode;
689 struct exofs_i_info *oi = exofs_i(inode);
690 loff_t i_size = i_size_read(inode);
691 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
692 size_t len;
693 int ret;
694
695 BUG_ON(!PageLocked(page));
696
697 ret = wait_obj_created(oi);
698 if (unlikely(ret))
699 goto fail;
700
701 if (page->index < end_index)
702 /* in this case, the page is within the limits of the file */
703 len = PAGE_CACHE_SIZE;
704 else {
705 len = i_size & ~PAGE_CACHE_MASK;
706
707 if (page->index > end_index || !len) {
708 /* in this case, the page is outside the limits
709 * (truncate in progress)
710 */
711 ret = write_exec(pcol);
712 if (unlikely(ret))
713 goto fail;
714 if (PageError(page))
715 ClearPageError(page);
716 unlock_page(page);
717 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
718 "outside the limits\n",
719 inode->i_ino, page->index);
720 return 0;
721 }
722 }
723
724try_again:
725
726 if (unlikely(pcol->pg_first == -1)) {
727 pcol->pg_first = page->index;
728 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
729 page->index)) {
730 /* Discontinuity detected, split the request */
731 ret = write_exec(pcol);
732 if (unlikely(ret))
733 goto fail;
734
735 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
736 inode->i_ino, page->index);
737 goto try_again;
738 }
739
740 if (!pcol->pages) {
741 ret = pcol_try_alloc(pcol);
742 if (unlikely(ret))
743 goto fail;
744 }
745
746 EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
747 inode->i_ino, page->index, len);
748
749 ret = pcol_add_page(pcol, page, len);
750 if (unlikely(ret)) {
751 EXOFS_DBGMSG2("Failed pcol_add_page "
752 "nr_pages=%u total_length=0x%lx\n",
753 pcol->nr_pages, pcol->length);
754
755 /* split the request, next loop will start again */
756 ret = write_exec(pcol);
757 if (unlikely(ret)) {
758 EXOFS_DBGMSG("write_exec failed => %d", ret);
759 goto fail;
760 }
761
762 goto try_again;
763 }
764
765 BUG_ON(PageWriteback(page));
766 set_page_writeback(page);
767
768 return 0;
769
770fail:
771 EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
772 inode->i_ino, page->index, ret);
773 set_bit(AS_EIO, &page->mapping->flags);
774 unlock_page(page);
775 return ret;
776}
777
778static int exofs_writepages(struct address_space *mapping,
779 struct writeback_control *wbc)
780{
781 struct page_collect pcol;
782 long start, end, expected_pages;
783 int ret;
784
785 start = wbc->range_start >> PAGE_CACHE_SHIFT;
786 end = (wbc->range_end == LLONG_MAX) ?
787 start + mapping->nrpages :
788 wbc->range_end >> PAGE_CACHE_SHIFT;
789
790 if (start || end)
791 expected_pages = end - start + 1;
792 else
793 expected_pages = mapping->nrpages;
794
795 if (expected_pages < 32L)
796 expected_pages = 32L;
797
798 EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
799 "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
800 mapping->host->i_ino, wbc->range_start, wbc->range_end,
801 mapping->nrpages, start, end, expected_pages);
802
803 _pcol_init(&pcol, expected_pages, mapping->host);
804
805 ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
806 if (unlikely(ret)) {
807 EXOFS_ERR("write_cache_pages => %d\n", ret);
808 return ret;
809 }
810
811 ret = write_exec(&pcol);
812 if (unlikely(ret))
813 return ret;
814
815 if (wbc->sync_mode == WB_SYNC_ALL) {
816 return write_exec(&pcol); /* pump the last reminder */
817 } else if (pcol.nr_pages) {
818 /* not SYNC let the reminder join the next writeout */
819 unsigned i;
820
821 for (i = 0; i < pcol.nr_pages; i++) {
822 struct page *page = pcol.pages[i];
823
824 end_page_writeback(page);
825 set_page_dirty(page);
826 unlock_page(page);
827 }
828 }
829 return 0;
830}
831
832/*
833static int exofs_writepage(struct page *page, struct writeback_control *wbc)
834{
835 struct page_collect pcol;
836 int ret;
837
838 _pcol_init(&pcol, 1, page->mapping->host);
839
840 ret = writepage_strip(page, NULL, &pcol);
841 if (ret) {
842 EXOFS_ERR("exofs_writepage => %d\n", ret);
843 return ret;
844 }
845
846 return write_exec(&pcol);
847}
848*/
849/* i_mutex held using inode->i_size directly */
850static void _write_failed(struct inode *inode, loff_t to)
851{
852 if (to > inode->i_size)
853 truncate_pagecache(inode, to, inode->i_size);
854}
855
856int exofs_write_begin(struct file *file, struct address_space *mapping,
857 loff_t pos, unsigned len, unsigned flags,
858 struct page **pagep, void **fsdata)
859{
860 int ret = 0;
861 struct page *page;
862
863 page = *pagep;
864 if (page == NULL) {
865 ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
866 fsdata);
867 if (ret) {
868 EXOFS_DBGMSG("simple_write_begin failed\n");
869 goto out;
870 }
871
872 page = *pagep;
873 }
874
875 /* read modify write */
876 if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
877 loff_t i_size = i_size_read(mapping->host);
878 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
879 size_t rlen;
880
881 if (page->index < end_index)
882 rlen = PAGE_CACHE_SIZE;
883 else if (page->index == end_index)
884 rlen = i_size & ~PAGE_CACHE_MASK;
885 else
886 rlen = 0;
887
888 if (!rlen) {
889 clear_highpage(page);
890 SetPageUptodate(page);
891 goto out;
892 }
893
894 ret = _readpage(page, true);
895 if (ret) {
896 /*SetPageError was done by _readpage. Is it ok?*/
897 unlock_page(page);
898 EXOFS_DBGMSG("__readpage failed\n");
899 }
900 }
901out:
902 if (unlikely(ret))
903 _write_failed(mapping->host, pos + len);
904
905 return ret;
906}
907
908static int exofs_write_begin_export(struct file *file,
909 struct address_space *mapping,
910 loff_t pos, unsigned len, unsigned flags,
911 struct page **pagep, void **fsdata)
912{
913 *pagep = NULL;
914
915 return exofs_write_begin(file, mapping, pos, len, flags, pagep,
916 fsdata);
917}
918
919static int exofs_write_end(struct file *file, struct address_space *mapping,
920 loff_t pos, unsigned len, unsigned copied,
921 struct page *page, void *fsdata)
922{
923 struct inode *inode = mapping->host;
924 /* According to comment in simple_write_end i_mutex is held */
925 loff_t i_size = inode->i_size;
926 int ret;
927
928 ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
929 if (unlikely(ret))
930 _write_failed(inode, pos + len);
931
932 /* TODO: once simple_write_end marks inode dirty remove */
933 if (i_size != inode->i_size)
934 mark_inode_dirty(inode);
935 return ret;
936}
937
938static int exofs_releasepage(struct page *page, gfp_t gfp)
939{
940 EXOFS_DBGMSG("page 0x%lx\n", page->index);
941 WARN_ON(1);
942 return 0;
943}
944
945static void exofs_invalidatepage(struct page *page, unsigned long offset)
946{
947 EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset);
948 WARN_ON(1);
949}
950
951const struct address_space_operations exofs_aops = {
952 .readpage = exofs_readpage,
953 .readpages = exofs_readpages,
954 .writepage = NULL,
955 .writepages = exofs_writepages,
956 .write_begin = exofs_write_begin_export,
957 .write_end = exofs_write_end,
958 .releasepage = exofs_releasepage,
959 .set_page_dirty = __set_page_dirty_nobuffers,
960 .invalidatepage = exofs_invalidatepage,
961
962 /* Not implemented Yet */
963 .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
964 .direct_IO = NULL, /* TODO: Should be trivial to do */
965
966 /* With these NULL has special meaning or default is not exported */
967 .get_xip_mem = NULL,
968 .migratepage = NULL,
969 .launder_page = NULL,
970 .is_partially_uptodate = NULL,
971 .error_remove_page = NULL,
972};
973
974/******************************************************************************
975 * INODE OPERATIONS
976 *****************************************************************************/
977
978/*
979 * Test whether an inode is a fast symlink.
980 */
981static inline int exofs_inode_is_fast_symlink(struct inode *inode)
982{
983 struct exofs_i_info *oi = exofs_i(inode);
984
985 return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
986}
987
988static int _do_truncate(struct inode *inode, loff_t newsize)
989{
990 struct exofs_i_info *oi = exofs_i(inode);
991 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
992 int ret;
993
994 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
995
996 ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize);
997 if (likely(!ret))
998 truncate_setsize(inode, newsize);
999
1000 EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n",
1001 inode->i_ino, newsize, ret);
1002 return ret;
1003}
1004
1005/*
1006 * Set inode attributes - update size attribute on OSD if needed,
1007 * otherwise just call generic functions.
1008 */
1009int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
1010{
1011 struct inode *inode = dentry->d_inode;
1012 int error;
1013
1014 /* if we are about to modify an object, and it hasn't been
1015 * created yet, wait
1016 */
1017 error = wait_obj_created(exofs_i(inode));
1018 if (unlikely(error))
1019 return error;
1020
1021 error = inode_change_ok(inode, iattr);
1022 if (unlikely(error))
1023 return error;
1024
1025 if ((iattr->ia_valid & ATTR_SIZE) &&
1026 iattr->ia_size != i_size_read(inode)) {
1027 error = _do_truncate(inode, iattr->ia_size);
1028 if (unlikely(error))
1029 return error;
1030 }
1031
1032 setattr_copy(inode, iattr);
1033 mark_inode_dirty(inode);
1034 return 0;
1035}
1036
1037static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
1038 EXOFS_APAGE_FS_DATA,
1039 EXOFS_ATTR_INODE_FILE_LAYOUT,
1040 0);
1041static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
1042 EXOFS_APAGE_FS_DATA,
1043 EXOFS_ATTR_INODE_DIR_LAYOUT,
1044 0);
1045
1046/*
1047 * Read the Linux inode info from the OSD, and return it as is. In exofs the
1048 * inode info is in an application specific page/attribute of the osd-object.
1049 */
1050static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
1051 struct exofs_fcb *inode)
1052{
1053 struct exofs_sb_info *sbi = sb->s_fs_info;
1054 struct osd_attr attrs[] = {
1055 [0] = g_attr_inode_data,
1056 [1] = g_attr_inode_file_layout,
1057 [2] = g_attr_inode_dir_layout,
1058 };
1059 struct ore_io_state *ios;
1060 struct exofs_on_disk_inode_layout *layout;
1061 int ret;
1062
1063 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1064 if (unlikely(ret)) {
1065 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1066 return ret;
1067 }
1068
1069 attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1070 attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1071
1072 ios->in_attr = attrs;
1073 ios->in_attr_len = ARRAY_SIZE(attrs);
1074
1075 ret = ore_read(ios);
1076 if (unlikely(ret)) {
1077 EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
1078 _LLU(oi->one_comp.obj.id), ret);
1079 memset(inode, 0, sizeof(*inode));
1080 inode->i_mode = 0040000 | (0777 & ~022);
1081 /* If object is lost on target we might as well enable it's
1082 * delete.
1083 */
1084 if ((ret == -ENOENT) || (ret == -EINVAL))
1085 ret = 0;
1086 goto out;
1087 }
1088
1089 ret = extract_attr_from_ios(ios, &attrs[0]);
1090 if (ret) {
1091 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1092 goto out;
1093 }
1094 WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
1095 memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
1096
1097 ret = extract_attr_from_ios(ios, &attrs[1]);
1098 if (ret) {
1099 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1100 goto out;
1101 }
1102 if (attrs[1].len) {
1103 layout = attrs[1].val_ptr;
1104 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1105 EXOFS_ERR("%s: unsupported files layout %d\n",
1106 __func__, layout->gen_func);
1107 ret = -ENOTSUPP;
1108 goto out;
1109 }
1110 }
1111
1112 ret = extract_attr_from_ios(ios, &attrs[2]);
1113 if (ret) {
1114 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1115 goto out;
1116 }
1117 if (attrs[2].len) {
1118 layout = attrs[2].val_ptr;
1119 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1120 EXOFS_ERR("%s: unsupported meta-data layout %d\n",
1121 __func__, layout->gen_func);
1122 ret = -ENOTSUPP;
1123 goto out;
1124 }
1125 }
1126
1127out:
1128 ore_put_io_state(ios);
1129 return ret;
1130}
1131
1132static void __oi_init(struct exofs_i_info *oi)
1133{
1134 init_waitqueue_head(&oi->i_wq);
1135 oi->i_flags = 0;
1136}
1137/*
1138 * Fill in an inode read from the OSD and set it up for use
1139 */
1140struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
1141{
1142 struct exofs_i_info *oi;
1143 struct exofs_fcb fcb;
1144 struct inode *inode;
1145 int ret;
1146
1147 inode = iget_locked(sb, ino);
1148 if (!inode)
1149 return ERR_PTR(-ENOMEM);
1150 if (!(inode->i_state & I_NEW))
1151 return inode;
1152 oi = exofs_i(inode);
1153 __oi_init(oi);
1154 exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1155 exofs_oi_objno(oi));
1156
1157 /* read the inode from the osd */
1158 ret = exofs_get_inode(sb, oi, &fcb);
1159 if (ret)
1160 goto bad_inode;
1161
1162 set_obj_created(oi);
1163
1164 /* copy stuff from on-disk struct to in-memory struct */
1165 inode->i_mode = le16_to_cpu(fcb.i_mode);
1166 inode->i_uid = le32_to_cpu(fcb.i_uid);
1167 inode->i_gid = le32_to_cpu(fcb.i_gid);
1168 set_nlink(inode, le16_to_cpu(fcb.i_links_count));
1169 inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
1170 inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
1171 inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
1172 inode->i_ctime.tv_nsec =
1173 inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
1174 oi->i_commit_size = le64_to_cpu(fcb.i_size);
1175 i_size_write(inode, oi->i_commit_size);
1176 inode->i_blkbits = EXOFS_BLKSHIFT;
1177 inode->i_generation = le32_to_cpu(fcb.i_generation);
1178
1179 oi->i_dir_start_lookup = 0;
1180
1181 if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
1182 ret = -ESTALE;
1183 goto bad_inode;
1184 }
1185
1186 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1187 if (fcb.i_data[0])
1188 inode->i_rdev =
1189 old_decode_dev(le32_to_cpu(fcb.i_data[0]));
1190 else
1191 inode->i_rdev =
1192 new_decode_dev(le32_to_cpu(fcb.i_data[1]));
1193 } else {
1194 memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
1195 }
1196
1197 inode->i_mapping->backing_dev_info = sb->s_bdi;
1198 if (S_ISREG(inode->i_mode)) {
1199 inode->i_op = &exofs_file_inode_operations;
1200 inode->i_fop = &exofs_file_operations;
1201 inode->i_mapping->a_ops = &exofs_aops;
1202 } else if (S_ISDIR(inode->i_mode)) {
1203 inode->i_op = &exofs_dir_inode_operations;
1204 inode->i_fop = &exofs_dir_operations;
1205 inode->i_mapping->a_ops = &exofs_aops;
1206 } else if (S_ISLNK(inode->i_mode)) {
1207 if (exofs_inode_is_fast_symlink(inode))
1208 inode->i_op = &exofs_fast_symlink_inode_operations;
1209 else {
1210 inode->i_op = &exofs_symlink_inode_operations;
1211 inode->i_mapping->a_ops = &exofs_aops;
1212 }
1213 } else {
1214 inode->i_op = &exofs_special_inode_operations;
1215 if (fcb.i_data[0])
1216 init_special_inode(inode, inode->i_mode,
1217 old_decode_dev(le32_to_cpu(fcb.i_data[0])));
1218 else
1219 init_special_inode(inode, inode->i_mode,
1220 new_decode_dev(le32_to_cpu(fcb.i_data[1])));
1221 }
1222
1223 unlock_new_inode(inode);
1224 return inode;
1225
1226bad_inode:
1227 iget_failed(inode);
1228 return ERR_PTR(ret);
1229}
1230
1231int __exofs_wait_obj_created(struct exofs_i_info *oi)
1232{
1233 if (!obj_created(oi)) {
1234 EXOFS_DBGMSG("!obj_created\n");
1235 BUG_ON(!obj_2bcreated(oi));
1236 wait_event(oi->i_wq, obj_created(oi));
1237 EXOFS_DBGMSG("wait_event done\n");
1238 }
1239 return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
1240}
1241
1242/*
1243 * Callback function from exofs_new_inode(). The important thing is that we
1244 * set the obj_created flag so that other methods know that the object exists on
1245 * the OSD.
1246 */
1247static void create_done(struct ore_io_state *ios, void *p)
1248{
1249 struct inode *inode = p;
1250 struct exofs_i_info *oi = exofs_i(inode);
1251 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1252 int ret;
1253
1254 ret = ore_check_io(ios, NULL);
1255 ore_put_io_state(ios);
1256
1257 atomic_dec(&sbi->s_curr_pending);
1258
1259 if (unlikely(ret)) {
1260 EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx",
1261 _LLU(exofs_oi_objno(oi)),
1262 _LLU(oi->one_comp.obj.partition));
1263 /*TODO: When FS is corrupted creation can fail, object already
1264 * exist. Get rid of this asynchronous creation, if exist
1265 * increment the obj counter and try the next object. Until we
1266 * succeed. All these dangling objects will be made into lost
1267 * files by chkfs.exofs
1268 */
1269 }
1270
1271 set_obj_created(oi);
1272
1273 wake_up(&oi->i_wq);
1274}
1275
1276/*
1277 * Set up a new inode and create an object for it on the OSD
1278 */
1279struct inode *exofs_new_inode(struct inode *dir, umode_t mode)
1280{
1281 struct super_block *sb = dir->i_sb;
1282 struct exofs_sb_info *sbi = sb->s_fs_info;
1283 struct inode *inode;
1284 struct exofs_i_info *oi;
1285 struct ore_io_state *ios;
1286 int ret;
1287
1288 inode = new_inode(sb);
1289 if (!inode)
1290 return ERR_PTR(-ENOMEM);
1291
1292 oi = exofs_i(inode);
1293 __oi_init(oi);
1294
1295 set_obj_2bcreated(oi);
1296
1297 inode->i_mapping->backing_dev_info = sb->s_bdi;
1298 inode_init_owner(inode, dir, mode);
1299 inode->i_ino = sbi->s_nextid++;
1300 inode->i_blkbits = EXOFS_BLKSHIFT;
1301 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1302 oi->i_commit_size = inode->i_size = 0;
1303 spin_lock(&sbi->s_next_gen_lock);
1304 inode->i_generation = sbi->s_next_generation++;
1305 spin_unlock(&sbi->s_next_gen_lock);
1306 insert_inode_hash(inode);
1307
1308 exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1309 exofs_oi_objno(oi));
1310 exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
1311
1312 mark_inode_dirty(inode);
1313
1314 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1315 if (unlikely(ret)) {
1316 EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n");
1317 return ERR_PTR(ret);
1318 }
1319
1320 ios->done = create_done;
1321 ios->private = inode;
1322
1323 ret = ore_create(ios);
1324 if (ret) {
1325 ore_put_io_state(ios);
1326 return ERR_PTR(ret);
1327 }
1328 atomic_inc(&sbi->s_curr_pending);
1329
1330 return inode;
1331}
1332
1333/*
1334 * struct to pass two arguments to update_inode's callback
1335 */
1336struct updatei_args {
1337 struct exofs_sb_info *sbi;
1338 struct exofs_fcb fcb;
1339};
1340
1341/*
1342 * Callback function from exofs_update_inode().
1343 */
1344static void updatei_done(struct ore_io_state *ios, void *p)
1345{
1346 struct updatei_args *args = p;
1347
1348 ore_put_io_state(ios);
1349
1350 atomic_dec(&args->sbi->s_curr_pending);
1351
1352 kfree(args);
1353}
1354
1355/*
1356 * Write the inode to the OSD. Just fill up the struct, and set the attribute
1357 * synchronously or asynchronously depending on the do_sync flag.
1358 */
1359static int exofs_update_inode(struct inode *inode, int do_sync)
1360{
1361 struct exofs_i_info *oi = exofs_i(inode);
1362 struct super_block *sb = inode->i_sb;
1363 struct exofs_sb_info *sbi = sb->s_fs_info;
1364 struct ore_io_state *ios;
1365 struct osd_attr attr;
1366 struct exofs_fcb *fcb;
1367 struct updatei_args *args;
1368 int ret;
1369
1370 args = kzalloc(sizeof(*args), GFP_KERNEL);
1371 if (!args) {
1372 EXOFS_DBGMSG("Failed kzalloc of args\n");
1373 return -ENOMEM;
1374 }
1375
1376 fcb = &args->fcb;
1377
1378 fcb->i_mode = cpu_to_le16(inode->i_mode);
1379 fcb->i_uid = cpu_to_le32(inode->i_uid);
1380 fcb->i_gid = cpu_to_le32(inode->i_gid);
1381 fcb->i_links_count = cpu_to_le16(inode->i_nlink);
1382 fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
1383 fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
1384 fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
1385 oi->i_commit_size = i_size_read(inode);
1386 fcb->i_size = cpu_to_le64(oi->i_commit_size);
1387 fcb->i_generation = cpu_to_le32(inode->i_generation);
1388
1389 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1390 if (old_valid_dev(inode->i_rdev)) {
1391 fcb->i_data[0] =
1392 cpu_to_le32(old_encode_dev(inode->i_rdev));
1393 fcb->i_data[1] = 0;
1394 } else {
1395 fcb->i_data[0] = 0;
1396 fcb->i_data[1] =
1397 cpu_to_le32(new_encode_dev(inode->i_rdev));
1398 fcb->i_data[2] = 0;
1399 }
1400 } else
1401 memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
1402
1403 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1404 if (unlikely(ret)) {
1405 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1406 goto free_args;
1407 }
1408
1409 attr = g_attr_inode_data;
1410 attr.val_ptr = fcb;
1411 ios->out_attr_len = 1;
1412 ios->out_attr = &attr;
1413
1414 wait_obj_created(oi);
1415
1416 if (!do_sync) {
1417 args->sbi = sbi;
1418 ios->done = updatei_done;
1419 ios->private = args;
1420 }
1421
1422 ret = ore_write(ios);
1423 if (!do_sync && !ret) {
1424 atomic_inc(&sbi->s_curr_pending);
1425 goto out; /* deallocation in updatei_done */
1426 }
1427
1428 ore_put_io_state(ios);
1429free_args:
1430 kfree(args);
1431out:
1432 EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
1433 inode->i_ino, do_sync, ret);
1434 return ret;
1435}
1436
1437int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
1438{
1439 /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */
1440 return exofs_update_inode(inode, 1);
1441}
1442
1443/*
1444 * Callback function from exofs_delete_inode() - don't have much cleaning up to
1445 * do.
1446 */
1447static void delete_done(struct ore_io_state *ios, void *p)
1448{
1449 struct exofs_sb_info *sbi = p;
1450
1451 ore_put_io_state(ios);
1452
1453 atomic_dec(&sbi->s_curr_pending);
1454}
1455
1456/*
1457 * Called when the refcount of an inode reaches zero. We remove the object
1458 * from the OSD here. We make sure the object was created before we try and
1459 * delete it.
1460 */
1461void exofs_evict_inode(struct inode *inode)
1462{
1463 struct exofs_i_info *oi = exofs_i(inode);
1464 struct super_block *sb = inode->i_sb;
1465 struct exofs_sb_info *sbi = sb->s_fs_info;
1466 struct ore_io_state *ios;
1467 int ret;
1468
1469 truncate_inode_pages(&inode->i_data, 0);
1470
1471 /* TODO: should do better here */
1472 if (inode->i_nlink || is_bad_inode(inode))
1473 goto no_delete;
1474
1475 inode->i_size = 0;
1476 clear_inode(inode);
1477
1478 /* if we are deleting an obj that hasn't been created yet, wait.
1479 * This also makes sure that create_done cannot be called with an
1480 * already evicted inode.
1481 */
1482 wait_obj_created(oi);
1483 /* ignore the error, attempt a remove anyway */
1484
1485 /* Now Remove the OSD objects */
1486 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1487 if (unlikely(ret)) {
1488 EXOFS_ERR("%s: ore_get_io_state failed\n", __func__);
1489 return;
1490 }
1491
1492 ios->done = delete_done;
1493 ios->private = sbi;
1494
1495 ret = ore_remove(ios);
1496 if (ret) {
1497 EXOFS_ERR("%s: ore_remove failed\n", __func__);
1498 ore_put_io_state(ios);
1499 return;
1500 }
1501 atomic_inc(&sbi->s_curr_pending);
1502
1503 return;
1504
1505no_delete:
1506 clear_inode(inode);
1507}