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Linux 3.11-rc7
[linux-2.6.git] / fs / exofs / inode.c
blob2ec8eb1ab269ae292d338d5d97ee48990af5b2c7
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
40 unsigned 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
49 struct 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
66 static 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
85 static 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
105 static 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
126 static 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
137 static 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
148 enum {PAGE_WAS_NOT_IN_IO = 17};
149 static 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
180 static 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 */
195 static 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 */
243 static 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
252 static 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
268 static 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
308 static 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_CACHE_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
363 err:
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 */
380 static 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_CACHE_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_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
426 try_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
467 fail:
468 /* SetPageError(page); ??? */
469 unlock_page(page);
470 return ret;
471 }
472
473 static 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
494 static 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 */
514 static 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 */
520 static 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
568 static 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_DBGMSG("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 if (PageDirty(page) || PageWriteback(page))
596 *uptodate = true;
597 else
598 *uptodate = PageUptodate(page);
599 EXOFS_DBGMSG("index=0x%lx uptodate=%d\n", index, *uptodate);
600 return page;
601 } else {
602 EXOFS_DBGMSG("YES that_locked_page index=0x%lx\n",
603 pcol->that_locked_page->index);
604 *uptodate = true;
605 return pcol->that_locked_page;
606 }
607 }
608
609 static void __r4w_put_page(void *priv, struct page *page)
610 {
611 struct page_collect *pcol = priv;
612
613 if ((pcol->that_locked_page != page) && (ZERO_PAGE(0) != page)) {
614 EXOFS_DBGMSG("index=0x%lx\n", page->index);
615 page_cache_release(page);
616 return;
617 }
618 EXOFS_DBGMSG("that_locked_page index=0x%lx\n",
619 ZERO_PAGE(0) == page ? -1 : page->index);
620 }
621
622 static const struct _ore_r4w_op _r4w_op = {
623 .get_page = &__r4w_get_page,
624 .put_page = &__r4w_put_page,
625 };
626
627 static int write_exec(struct page_collect *pcol)
628 {
629 struct exofs_i_info *oi = exofs_i(pcol->inode);
630 struct ore_io_state *ios;
631 struct page_collect *pcol_copy = NULL;
632 int ret;
633
634 if (!pcol->pages)
635 return 0;
636
637 BUG_ON(pcol->ios);
638 ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false,
639 pcol->pg_first << PAGE_CACHE_SHIFT,
640 pcol->length, &pcol->ios);
641 if (unlikely(ret))
642 goto err;
643
644 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
645 if (!pcol_copy) {
646 EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
647 ret = -ENOMEM;
648 goto err;
649 }
650
651 *pcol_copy = *pcol;
652
653 ios = pcol->ios;
654 ios->pages = pcol_copy->pages;
655 ios->done = writepages_done;
656 ios->r4w = &_r4w_op;
657 ios->private = pcol_copy;
658
659 /* pages ownership was passed to pcol_copy */
660 _pcol_reset(pcol);
661
662 ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
663 if (unlikely(ret))
664 goto err;
665
666 EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n",
667 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
668
669 ret = ore_write(ios);
670 if (unlikely(ret)) {
671 EXOFS_ERR("write_exec: ore_write() Failed\n");
672 goto err;
673 }
674
675 atomic_inc(&pcol->sbi->s_curr_pending);
676 return 0;
677
678 err:
679 if (!pcol_copy) /* Failed before ownership transfer */
680 pcol_copy = pcol;
681 _unlock_pcol_pages(pcol_copy, ret, WRITE);
682 pcol_free(pcol_copy);
683 kfree(pcol_copy);
684
685 return ret;
686 }
687
688 /* writepage_strip is called either directly from writepage() or by the VFS from
689 * within write_cache_pages(), to add one more page to be written to storage.
690 * It will try to collect as many contiguous pages as possible. If a
691 * discontinuity is encountered or it runs out of resources it will submit the
692 * previous segment and will start a new collection.
693 * Eventually caller must submit the last segment if present.
694 */
695 static int writepage_strip(struct page *page,
696 struct writeback_control *wbc_unused, void *data)
697 {
698 struct page_collect *pcol = data;
699 struct inode *inode = pcol->inode;
700 struct exofs_i_info *oi = exofs_i(inode);
701 loff_t i_size = i_size_read(inode);
702 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
703 size_t len;
704 int ret;
705
706 BUG_ON(!PageLocked(page));
707
708 ret = wait_obj_created(oi);
709 if (unlikely(ret))
710 goto fail;
711
712 if (page->index < end_index)
713 /* in this case, the page is within the limits of the file */
714 len = PAGE_CACHE_SIZE;
715 else {
716 len = i_size & ~PAGE_CACHE_MASK;
717
718 if (page->index > end_index || !len) {
719 /* in this case, the page is outside the limits
720 * (truncate in progress)
721 */
722 ret = write_exec(pcol);
723 if (unlikely(ret))
724 goto fail;
725 if (PageError(page))
726 ClearPageError(page);
727 unlock_page(page);
728 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
729 "outside the limits\n",
730 inode->i_ino, page->index);
731 return 0;
732 }
733 }
734
735 try_again:
736
737 if (unlikely(pcol->pg_first == -1)) {
738 pcol->pg_first = page->index;
739 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
740 page->index)) {
741 /* Discontinuity detected, split the request */
742 ret = write_exec(pcol);
743 if (unlikely(ret))
744 goto fail;
745
746 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
747 inode->i_ino, page->index);
748 goto try_again;
749 }
750
751 if (!pcol->pages) {
752 ret = pcol_try_alloc(pcol);
753 if (unlikely(ret))
754 goto fail;
755 }
756
757 EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
758 inode->i_ino, page->index, len);
759
760 ret = pcol_add_page(pcol, page, len);
761 if (unlikely(ret)) {
762 EXOFS_DBGMSG2("Failed pcol_add_page "
763 "nr_pages=%u total_length=0x%lx\n",
764 pcol->nr_pages, pcol->length);
765
766 /* split the request, next loop will start again */
767 ret = write_exec(pcol);
768 if (unlikely(ret)) {
769 EXOFS_DBGMSG("write_exec failed => %d", ret);
770 goto fail;
771 }
772
773 goto try_again;
774 }
775
776 BUG_ON(PageWriteback(page));
777 set_page_writeback(page);
778
779 return 0;
780
781 fail:
782 EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
783 inode->i_ino, page->index, ret);
784 set_bit(AS_EIO, &page->mapping->flags);
785 unlock_page(page);
786 return ret;
787 }
788
789 static int exofs_writepages(struct address_space *mapping,
790 struct writeback_control *wbc)
791 {
792 struct page_collect pcol;
793 long start, end, expected_pages;
794 int ret;
795
796 start = wbc->range_start >> PAGE_CACHE_SHIFT;
797 end = (wbc->range_end == LLONG_MAX) ?
798 start + mapping->nrpages :
799 wbc->range_end >> PAGE_CACHE_SHIFT;
800
801 if (start || end)
802 expected_pages = end - start + 1;
803 else
804 expected_pages = mapping->nrpages;
805
806 if (expected_pages < 32L)
807 expected_pages = 32L;
808
809 EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
810 "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
811 mapping->host->i_ino, wbc->range_start, wbc->range_end,
812 mapping->nrpages, start, end, expected_pages);
813
814 _pcol_init(&pcol, expected_pages, mapping->host);
815
816 ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
817 if (unlikely(ret)) {
818 EXOFS_ERR("write_cache_pages => %d\n", ret);
819 return ret;
820 }
821
822 ret = write_exec(&pcol);
823 if (unlikely(ret))
824 return ret;
825
826 if (wbc->sync_mode == WB_SYNC_ALL) {
827 return write_exec(&pcol); /* pump the last reminder */
828 } else if (pcol.nr_pages) {
829 /* not SYNC let the reminder join the next writeout */
830 unsigned i;
831
832 for (i = 0; i < pcol.nr_pages; i++) {
833 struct page *page = pcol.pages[i];
834
835 end_page_writeback(page);
836 set_page_dirty(page);
837 unlock_page(page);
838 }
839 }
840 return 0;
841 }
842
843 /*
844 static int exofs_writepage(struct page *page, struct writeback_control *wbc)
845 {
846 struct page_collect pcol;
847 int ret;
848
849 _pcol_init(&pcol, 1, page->mapping->host);
850
851 ret = writepage_strip(page, NULL, &pcol);
852 if (ret) {
853 EXOFS_ERR("exofs_writepage => %d\n", ret);
854 return ret;
855 }
856
857 return write_exec(&pcol);
858 }
859 */
860 /* i_mutex held using inode->i_size directly */
861 static void _write_failed(struct inode *inode, loff_t to)
862 {
863 if (to > inode->i_size)
864 truncate_pagecache(inode, to, inode->i_size);
865 }
866
867 int exofs_write_begin(struct file *file, struct address_space *mapping,
868 loff_t pos, unsigned len, unsigned flags,
869 struct page **pagep, void **fsdata)
870 {
871 int ret = 0;
872 struct page *page;
873
874 page = *pagep;
875 if (page == NULL) {
876 ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
877 fsdata);
878 if (ret) {
879 EXOFS_DBGMSG("simple_write_begin failed\n");
880 goto out;
881 }
882
883 page = *pagep;
884 }
885
886 /* read modify write */
887 if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
888 loff_t i_size = i_size_read(mapping->host);
889 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
890 size_t rlen;
891
892 if (page->index < end_index)
893 rlen = PAGE_CACHE_SIZE;
894 else if (page->index == end_index)
895 rlen = i_size & ~PAGE_CACHE_MASK;
896 else
897 rlen = 0;
898
899 if (!rlen) {
900 clear_highpage(page);
901 SetPageUptodate(page);
902 goto out;
903 }
904
905 ret = _readpage(page, true);
906 if (ret) {
907 /*SetPageError was done by _readpage. Is it ok?*/
908 unlock_page(page);
909 EXOFS_DBGMSG("__readpage failed\n");
910 }
911 }
912 out:
913 if (unlikely(ret))
914 _write_failed(mapping->host, pos + len);
915
916 return ret;
917 }
918
919 static int exofs_write_begin_export(struct file *file,
920 struct address_space *mapping,
921 loff_t pos, unsigned len, unsigned flags,
922 struct page **pagep, void **fsdata)
923 {
924 *pagep = NULL;
925
926 return exofs_write_begin(file, mapping, pos, len, flags, pagep,
927 fsdata);
928 }
929
930 static int exofs_write_end(struct file *file, struct address_space *mapping,
931 loff_t pos, unsigned len, unsigned copied,
932 struct page *page, void *fsdata)
933 {
934 struct inode *inode = mapping->host;
935 /* According to comment in simple_write_end i_mutex is held */
936 loff_t i_size = inode->i_size;
937 int ret;
938
939 ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
940 if (unlikely(ret))
941 _write_failed(inode, pos + len);
942
943 /* TODO: once simple_write_end marks inode dirty remove */
944 if (i_size != inode->i_size)
945 mark_inode_dirty(inode);
946 return ret;
947 }
948
949 static int exofs_releasepage(struct page *page, gfp_t gfp)
950 {
951 EXOFS_DBGMSG("page 0x%lx\n", page->index);
952 WARN_ON(1);
953 return 0;
954 }
955
956 static void exofs_invalidatepage(struct page *page, unsigned int offset,
957 unsigned int length)
958 {
959 EXOFS_DBGMSG("page 0x%lx offset 0x%x length 0x%x\n",
960 page->index, offset, length);
961 WARN_ON(1);
962 }
963
964 const struct address_space_operations exofs_aops = {
965 .readpage = exofs_readpage,
966 .readpages = exofs_readpages,
967 .writepage = NULL,
968 .writepages = exofs_writepages,
969 .write_begin = exofs_write_begin_export,
970 .write_end = exofs_write_end,
971 .releasepage = exofs_releasepage,
972 .set_page_dirty = __set_page_dirty_nobuffers,
973 .invalidatepage = exofs_invalidatepage,
974
975 /* Not implemented Yet */
976 .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
977 .direct_IO = NULL, /* TODO: Should be trivial to do */
978
979 /* With these NULL has special meaning or default is not exported */
980 .get_xip_mem = NULL,
981 .migratepage = NULL,
982 .launder_page = NULL,
983 .is_partially_uptodate = NULL,
984 .error_remove_page = NULL,
985 };
986
987 /******************************************************************************
988 * INODE OPERATIONS
989 *****************************************************************************/
990
991 /*
992 * Test whether an inode is a fast symlink.
993 */
994 static inline int exofs_inode_is_fast_symlink(struct inode *inode)
995 {
996 struct exofs_i_info *oi = exofs_i(inode);
997
998 return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
999 }
1000
1001 static int _do_truncate(struct inode *inode, loff_t newsize)
1002 {
1003 struct exofs_i_info *oi = exofs_i(inode);
1004 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1005 int ret;
1006
1007 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1008
1009 ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize);
1010 if (likely(!ret))
1011 truncate_setsize(inode, newsize);
1012
1013 EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n",
1014 inode->i_ino, newsize, ret);
1015 return ret;
1016 }
1017
1018 /*
1019 * Set inode attributes - update size attribute on OSD if needed,
1020 * otherwise just call generic functions.
1021 */
1022 int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
1023 {
1024 struct inode *inode = dentry->d_inode;
1025 int error;
1026
1027 /* if we are about to modify an object, and it hasn't been
1028 * created yet, wait
1029 */
1030 error = wait_obj_created(exofs_i(inode));
1031 if (unlikely(error))
1032 return error;
1033
1034 error = inode_change_ok(inode, iattr);
1035 if (unlikely(error))
1036 return error;
1037
1038 if ((iattr->ia_valid & ATTR_SIZE) &&
1039 iattr->ia_size != i_size_read(inode)) {
1040 error = _do_truncate(inode, iattr->ia_size);
1041 if (unlikely(error))
1042 return error;
1043 }
1044
1045 setattr_copy(inode, iattr);
1046 mark_inode_dirty(inode);
1047 return 0;
1048 }
1049
1050 static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
1051 EXOFS_APAGE_FS_DATA,
1052 EXOFS_ATTR_INODE_FILE_LAYOUT,
1053 0);
1054 static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
1055 EXOFS_APAGE_FS_DATA,
1056 EXOFS_ATTR_INODE_DIR_LAYOUT,
1057 0);
1058
1059 /*
1060 * Read the Linux inode info from the OSD, and return it as is. In exofs the
1061 * inode info is in an application specific page/attribute of the osd-object.
1062 */
1063 static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
1064 struct exofs_fcb *inode)
1065 {
1066 struct exofs_sb_info *sbi = sb->s_fs_info;
1067 struct osd_attr attrs[] = {
1068 [0] = g_attr_inode_data,
1069 [1] = g_attr_inode_file_layout,
1070 [2] = g_attr_inode_dir_layout,
1071 };
1072 struct ore_io_state *ios;
1073 struct exofs_on_disk_inode_layout *layout;
1074 int ret;
1075
1076 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1077 if (unlikely(ret)) {
1078 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1079 return ret;
1080 }
1081
1082 attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1083 attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1084
1085 ios->in_attr = attrs;
1086 ios->in_attr_len = ARRAY_SIZE(attrs);
1087
1088 ret = ore_read(ios);
1089 if (unlikely(ret)) {
1090 EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
1091 _LLU(oi->one_comp.obj.id), ret);
1092 memset(inode, 0, sizeof(*inode));
1093 inode->i_mode = 0040000 | (0777 & ~022);
1094 /* If object is lost on target we might as well enable it's
1095 * delete.
1096 */
1097 if ((ret == -ENOENT) || (ret == -EINVAL))
1098 ret = 0;
1099 goto out;
1100 }
1101
1102 ret = extract_attr_from_ios(ios, &attrs[0]);
1103 if (ret) {
1104 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1105 goto out;
1106 }
1107 WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
1108 memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
1109
1110 ret = extract_attr_from_ios(ios, &attrs[1]);
1111 if (ret) {
1112 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1113 goto out;
1114 }
1115 if (attrs[1].len) {
1116 layout = attrs[1].val_ptr;
1117 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1118 EXOFS_ERR("%s: unsupported files layout %d\n",
1119 __func__, layout->gen_func);
1120 ret = -ENOTSUPP;
1121 goto out;
1122 }
1123 }
1124
1125 ret = extract_attr_from_ios(ios, &attrs[2]);
1126 if (ret) {
1127 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1128 goto out;
1129 }
1130 if (attrs[2].len) {
1131 layout = attrs[2].val_ptr;
1132 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1133 EXOFS_ERR("%s: unsupported meta-data layout %d\n",
1134 __func__, layout->gen_func);
1135 ret = -ENOTSUPP;
1136 goto out;
1137 }
1138 }
1139
1140 out:
1141 ore_put_io_state(ios);
1142 return ret;
1143 }
1144
1145 static void __oi_init(struct exofs_i_info *oi)
1146 {
1147 init_waitqueue_head(&oi->i_wq);
1148 oi->i_flags = 0;
1149 }
1150 /*
1151 * Fill in an inode read from the OSD and set it up for use
1152 */
1153 struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
1154 {
1155 struct exofs_i_info *oi;
1156 struct exofs_fcb fcb;
1157 struct inode *inode;
1158 int ret;
1159
1160 inode = iget_locked(sb, ino);
1161 if (!inode)
1162 return ERR_PTR(-ENOMEM);
1163 if (!(inode->i_state & I_NEW))
1164 return inode;
1165 oi = exofs_i(inode);
1166 __oi_init(oi);
1167 exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1168 exofs_oi_objno(oi));
1169
1170 /* read the inode from the osd */
1171 ret = exofs_get_inode(sb, oi, &fcb);
1172 if (ret)
1173 goto bad_inode;
1174
1175 set_obj_created(oi);
1176
1177 /* copy stuff from on-disk struct to in-memory struct */
1178 inode->i_mode = le16_to_cpu(fcb.i_mode);
1179 i_uid_write(inode, le32_to_cpu(fcb.i_uid));
1180 i_gid_write(inode, le32_to_cpu(fcb.i_gid));
1181 set_nlink(inode, le16_to_cpu(fcb.i_links_count));
1182 inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
1183 inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
1184 inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
1185 inode->i_ctime.tv_nsec =
1186 inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
1187 oi->i_commit_size = le64_to_cpu(fcb.i_size);
1188 i_size_write(inode, oi->i_commit_size);
1189 inode->i_blkbits = EXOFS_BLKSHIFT;
1190 inode->i_generation = le32_to_cpu(fcb.i_generation);
1191
1192 oi->i_dir_start_lookup = 0;
1193
1194 if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
1195 ret = -ESTALE;
1196 goto bad_inode;
1197 }
1198
1199 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1200 if (fcb.i_data[0])
1201 inode->i_rdev =
1202 old_decode_dev(le32_to_cpu(fcb.i_data[0]));
1203 else
1204 inode->i_rdev =
1205 new_decode_dev(le32_to_cpu(fcb.i_data[1]));
1206 } else {
1207 memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
1208 }
1209
1210 inode->i_mapping->backing_dev_info = sb->s_bdi;
1211 if (S_ISREG(inode->i_mode)) {
1212 inode->i_op = &exofs_file_inode_operations;
1213 inode->i_fop = &exofs_file_operations;
1214 inode->i_mapping->a_ops = &exofs_aops;
1215 } else if (S_ISDIR(inode->i_mode)) {
1216 inode->i_op = &exofs_dir_inode_operations;
1217 inode->i_fop = &exofs_dir_operations;
1218 inode->i_mapping->a_ops = &exofs_aops;
1219 } else if (S_ISLNK(inode->i_mode)) {
1220 if (exofs_inode_is_fast_symlink(inode))
1221 inode->i_op = &exofs_fast_symlink_inode_operations;
1222 else {
1223 inode->i_op = &exofs_symlink_inode_operations;
1224 inode->i_mapping->a_ops = &exofs_aops;
1225 }
1226 } else {
1227 inode->i_op = &exofs_special_inode_operations;
1228 if (fcb.i_data[0])
1229 init_special_inode(inode, inode->i_mode,
1230 old_decode_dev(le32_to_cpu(fcb.i_data[0])));
1231 else
1232 init_special_inode(inode, inode->i_mode,
1233 new_decode_dev(le32_to_cpu(fcb.i_data[1])));
1234 }
1235
1236 unlock_new_inode(inode);
1237 return inode;
1238
1239 bad_inode:
1240 iget_failed(inode);
1241 return ERR_PTR(ret);
1242 }
1243
1244 int __exofs_wait_obj_created(struct exofs_i_info *oi)
1245 {
1246 if (!obj_created(oi)) {
1247 EXOFS_DBGMSG("!obj_created\n");
1248 BUG_ON(!obj_2bcreated(oi));
1249 wait_event(oi->i_wq, obj_created(oi));
1250 EXOFS_DBGMSG("wait_event done\n");
1251 }
1252 return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
1253 }
1254
1255 /*
1256 * Callback function from exofs_new_inode(). The important thing is that we
1257 * set the obj_created flag so that other methods know that the object exists on
1258 * the OSD.
1259 */
1260 static void create_done(struct ore_io_state *ios, void *p)
1261 {
1262 struct inode *inode = p;
1263 struct exofs_i_info *oi = exofs_i(inode);
1264 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1265 int ret;
1266
1267 ret = ore_check_io(ios, NULL);
1268 ore_put_io_state(ios);
1269
1270 atomic_dec(&sbi->s_curr_pending);
1271
1272 if (unlikely(ret)) {
1273 EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx",
1274 _LLU(exofs_oi_objno(oi)),
1275 _LLU(oi->one_comp.obj.partition));
1276 /*TODO: When FS is corrupted creation can fail, object already
1277 * exist. Get rid of this asynchronous creation, if exist
1278 * increment the obj counter and try the next object. Until we
1279 * succeed. All these dangling objects will be made into lost
1280 * files by chkfs.exofs
1281 */
1282 }
1283
1284 set_obj_created(oi);
1285
1286 wake_up(&oi->i_wq);
1287 }
1288
1289 /*
1290 * Set up a new inode and create an object for it on the OSD
1291 */
1292 struct inode *exofs_new_inode(struct inode *dir, umode_t mode)
1293 {
1294 struct super_block *sb = dir->i_sb;
1295 struct exofs_sb_info *sbi = sb->s_fs_info;
1296 struct inode *inode;
1297 struct exofs_i_info *oi;
1298 struct ore_io_state *ios;
1299 int ret;
1300
1301 inode = new_inode(sb);
1302 if (!inode)
1303 return ERR_PTR(-ENOMEM);
1304
1305 oi = exofs_i(inode);
1306 __oi_init(oi);
1307
1308 set_obj_2bcreated(oi);
1309
1310 inode->i_mapping->backing_dev_info = sb->s_bdi;
1311 inode_init_owner(inode, dir, mode);
1312 inode->i_ino = sbi->s_nextid++;
1313 inode->i_blkbits = EXOFS_BLKSHIFT;
1314 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1315 oi->i_commit_size = inode->i_size = 0;
1316 spin_lock(&sbi->s_next_gen_lock);
1317 inode->i_generation = sbi->s_next_generation++;
1318 spin_unlock(&sbi->s_next_gen_lock);
1319 insert_inode_hash(inode);
1320
1321 exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1322 exofs_oi_objno(oi));
1323 exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
1324
1325 mark_inode_dirty(inode);
1326
1327 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1328 if (unlikely(ret)) {
1329 EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n");
1330 return ERR_PTR(ret);
1331 }
1332
1333 ios->done = create_done;
1334 ios->private = inode;
1335
1336 ret = ore_create(ios);
1337 if (ret) {
1338 ore_put_io_state(ios);
1339 return ERR_PTR(ret);
1340 }
1341 atomic_inc(&sbi->s_curr_pending);
1342
1343 return inode;
1344 }
1345
1346 /*
1347 * struct to pass two arguments to update_inode's callback
1348 */
1349 struct updatei_args {
1350 struct exofs_sb_info *sbi;
1351 struct exofs_fcb fcb;
1352 };
1353
1354 /*
1355 * Callback function from exofs_update_inode().
1356 */
1357 static void updatei_done(struct ore_io_state *ios, void *p)
1358 {
1359 struct updatei_args *args = p;
1360
1361 ore_put_io_state(ios);
1362
1363 atomic_dec(&args->sbi->s_curr_pending);
1364
1365 kfree(args);
1366 }
1367
1368 /*
1369 * Write the inode to the OSD. Just fill up the struct, and set the attribute
1370 * synchronously or asynchronously depending on the do_sync flag.
1371 */
1372 static int exofs_update_inode(struct inode *inode, int do_sync)
1373 {
1374 struct exofs_i_info *oi = exofs_i(inode);
1375 struct super_block *sb = inode->i_sb;
1376 struct exofs_sb_info *sbi = sb->s_fs_info;
1377 struct ore_io_state *ios;
1378 struct osd_attr attr;
1379 struct exofs_fcb *fcb;
1380 struct updatei_args *args;
1381 int ret;
1382
1383 args = kzalloc(sizeof(*args), GFP_KERNEL);
1384 if (!args) {
1385 EXOFS_DBGMSG("Failed kzalloc of args\n");
1386 return -ENOMEM;
1387 }
1388
1389 fcb = &args->fcb;
1390
1391 fcb->i_mode = cpu_to_le16(inode->i_mode);
1392 fcb->i_uid = cpu_to_le32(i_uid_read(inode));
1393 fcb->i_gid = cpu_to_le32(i_gid_read(inode));
1394 fcb->i_links_count = cpu_to_le16(inode->i_nlink);
1395 fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
1396 fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
1397 fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
1398 oi->i_commit_size = i_size_read(inode);
1399 fcb->i_size = cpu_to_le64(oi->i_commit_size);
1400 fcb->i_generation = cpu_to_le32(inode->i_generation);
1401
1402 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1403 if (old_valid_dev(inode->i_rdev)) {
1404 fcb->i_data[0] =
1405 cpu_to_le32(old_encode_dev(inode->i_rdev));
1406 fcb->i_data[1] = 0;
1407 } else {
1408 fcb->i_data[0] = 0;
1409 fcb->i_data[1] =
1410 cpu_to_le32(new_encode_dev(inode->i_rdev));
1411 fcb->i_data[2] = 0;
1412 }
1413 } else
1414 memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
1415
1416 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1417 if (unlikely(ret)) {
1418 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1419 goto free_args;
1420 }
1421
1422 attr = g_attr_inode_data;
1423 attr.val_ptr = fcb;
1424 ios->out_attr_len = 1;
1425 ios->out_attr = &attr;
1426
1427 wait_obj_created(oi);
1428
1429 if (!do_sync) {
1430 args->sbi = sbi;
1431 ios->done = updatei_done;
1432 ios->private = args;
1433 }
1434
1435 ret = ore_write(ios);
1436 if (!do_sync && !ret) {
1437 atomic_inc(&sbi->s_curr_pending);
1438 goto out; /* deallocation in updatei_done */
1439 }
1440
1441 ore_put_io_state(ios);
1442 free_args:
1443 kfree(args);
1444 out:
1445 EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
1446 inode->i_ino, do_sync, ret);
1447 return ret;
1448 }
1449
1450 int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
1451 {
1452 /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */
1453 return exofs_update_inode(inode, 1);
1454 }
1455
1456 /*
1457 * Callback function from exofs_delete_inode() - don't have much cleaning up to
1458 * do.
1459 */
1460 static void delete_done(struct ore_io_state *ios, void *p)
1461 {
1462 struct exofs_sb_info *sbi = p;
1463
1464 ore_put_io_state(ios);
1465
1466 atomic_dec(&sbi->s_curr_pending);
1467 }
1468
1469 /*
1470 * Called when the refcount of an inode reaches zero. We remove the object
1471 * from the OSD here. We make sure the object was created before we try and
1472 * delete it.
1473 */
1474 void exofs_evict_inode(struct inode *inode)
1475 {
1476 struct exofs_i_info *oi = exofs_i(inode);
1477 struct super_block *sb = inode->i_sb;
1478 struct exofs_sb_info *sbi = sb->s_fs_info;
1479 struct ore_io_state *ios;
1480 int ret;
1481
1482 truncate_inode_pages(&inode->i_data, 0);
1483
1484 /* TODO: should do better here */
1485 if (inode->i_nlink || is_bad_inode(inode))
1486 goto no_delete;
1487
1488 inode->i_size = 0;
1489 clear_inode(inode);
1490
1491 /* if we are deleting an obj that hasn't been created yet, wait.
1492 * This also makes sure that create_done cannot be called with an
1493 * already evicted inode.
1494 */
1495 wait_obj_created(oi);
1496 /* ignore the error, attempt a remove anyway */
1497
1498 /* Now Remove the OSD objects */
1499 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1500 if (unlikely(ret)) {
1501 EXOFS_ERR("%s: ore_get_io_state failed\n", __func__);
1502 return;
1503 }
1504
1505 ios->done = delete_done;
1506 ios->private = sbi;
1507
1508 ret = ore_remove(ios);
1509 if (ret) {
1510 EXOFS_ERR("%s: ore_remove failed\n", __func__);
1511 ore_put_io_state(ios);
1512 return;
1513 }
1514 atomic_inc(&sbi->s_curr_pending);
1515
1516 return;
1517
1518 no_delete:
1519 clear_inode(inode);
1520 }
Linus' kernel tree