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exofs: Support for short read/writes
[linux-2.6.git] / fs / exofs / inode.c
blob96366a1d7eae207ccea6184315116858368d3a99
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 enum { BIO_MAX_PAGES_KMALLOC =
41 (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
42 MAX_PAGES_KMALLOC =
43 PAGE_SIZE / sizeof(struct page *),
44 };
45
46 unsigned exofs_max_io_pages(struct ore_layout *layout,
47 unsigned expected_pages)
48 {
49 unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC);
50
51 /* TODO: easily support bio chaining */
52 pages = min_t(unsigned, pages,
53 layout->group_width * BIO_MAX_PAGES_KMALLOC);
54 return pages;
55 }
56
57 struct page_collect {
58 struct exofs_sb_info *sbi;
59 struct inode *inode;
60 unsigned expected_pages;
61 struct ore_io_state *ios;
62
63 struct page **pages;
64 unsigned alloc_pages;
65 unsigned nr_pages;
66 unsigned long length;
67 loff_t pg_first; /* keep 64bit also in 32-arches */
68 bool read_4_write; /* This means two things: that the read is sync
69 * And the pages should not be unlocked.
70 */
71 };
72
73 static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
74 struct inode *inode)
75 {
76 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
77
78 pcol->sbi = sbi;
79 pcol->inode = inode;
80 pcol->expected_pages = expected_pages;
81
82 pcol->ios = NULL;
83 pcol->pages = NULL;
84 pcol->alloc_pages = 0;
85 pcol->nr_pages = 0;
86 pcol->length = 0;
87 pcol->pg_first = -1;
88 pcol->read_4_write = false;
89 }
90
91 static void _pcol_reset(struct page_collect *pcol)
92 {
93 pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
94
95 pcol->pages = NULL;
96 pcol->alloc_pages = 0;
97 pcol->nr_pages = 0;
98 pcol->length = 0;
99 pcol->pg_first = -1;
100 pcol->ios = NULL;
101
102 /* this is probably the end of the loop but in writes
103 * it might not end here. don't be left with nothing
104 */
105 if (!pcol->expected_pages)
106 pcol->expected_pages = MAX_PAGES_KMALLOC;
107 }
108
109 static int pcol_try_alloc(struct page_collect *pcol)
110 {
111 unsigned pages;
112
113 /* TODO: easily support bio chaining */
114 pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages);
115
116 for (; pages; pages >>= 1) {
117 pcol->pages = kmalloc(pages * sizeof(struct page *),
118 GFP_KERNEL);
119 if (likely(pcol->pages)) {
120 pcol->alloc_pages = pages;
121 return 0;
122 }
123 }
124
125 EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
126 pcol->expected_pages);
127 return -ENOMEM;
128 }
129
130 static void pcol_free(struct page_collect *pcol)
131 {
132 kfree(pcol->pages);
133 pcol->pages = NULL;
134
135 if (pcol->ios) {
136 ore_put_io_state(pcol->ios);
137 pcol->ios = NULL;
138 }
139 }
140
141 static int pcol_add_page(struct page_collect *pcol, struct page *page,
142 unsigned len)
143 {
144 if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
145 return -ENOMEM;
146
147 pcol->pages[pcol->nr_pages++] = page;
148 pcol->length += len;
149 return 0;
150 }
151
152 enum {PAGE_WAS_NOT_IN_IO = 17};
153 static int update_read_page(struct page *page, int ret)
154 {
155 switch (ret) {
156 case 0:
157 /* Everything is OK */
158 SetPageUptodate(page);
159 if (PageError(page))
160 ClearPageError(page);
161 break;
162 case -EFAULT:
163 /* In this case we were trying to read something that wasn't on
164 * disk yet - return a page full of zeroes. This should be OK,
165 * because the object should be empty (if there was a write
166 * before this read, the read would be waiting with the page
167 * locked */
168 clear_highpage(page);
169
170 SetPageUptodate(page);
171 if (PageError(page))
172 ClearPageError(page);
173 EXOFS_DBGMSG("recovered read error\n");
174 /* fall through */
175 case PAGE_WAS_NOT_IN_IO:
176 ret = 0; /* recovered error */
177 break;
178 default:
179 SetPageError(page);
180 }
181 return ret;
182 }
183
184 static void update_write_page(struct page *page, int ret)
185 {
186 if (unlikely(ret == PAGE_WAS_NOT_IN_IO))
187 return; /* don't pass start don't collect $200 */
188
189 if (ret) {
190 mapping_set_error(page->mapping, ret);
191 SetPageError(page);
192 }
193 end_page_writeback(page);
194 }
195
196 /* Called at the end of reads, to optionally unlock pages and update their
197 * status.
198 */
199 static int __readpages_done(struct page_collect *pcol)
200 {
201 int i;
202 u64 resid;
203 u64 good_bytes;
204 u64 length = 0;
205 int ret = ore_check_io(pcol->ios, &resid);
206
207 if (likely(!ret)) {
208 good_bytes = pcol->length;
209 ret = PAGE_WAS_NOT_IN_IO;
210 } else {
211 good_bytes = pcol->length - resid;
212 }
213 if (good_bytes > pcol->ios->length)
214 good_bytes = pcol->ios->length;
215
216 EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
217 " length=0x%lx nr_pages=%u\n",
218 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
219 pcol->nr_pages);
220
221 for (i = 0; i < pcol->nr_pages; i++) {
222 struct page *page = pcol->pages[i];
223 struct inode *inode = page->mapping->host;
224 int page_stat;
225
226 if (inode != pcol->inode)
227 continue; /* osd might add more pages at end */
228
229 if (likely(length < good_bytes))
230 page_stat = 0;
231 else
232 page_stat = ret;
233
234 EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n",
235 inode->i_ino, page->index,
236 page_stat ? "bad_bytes" : "good_bytes");
237
238 ret = update_read_page(page, page_stat);
239 if (!pcol->read_4_write)
240 unlock_page(page);
241 length += PAGE_SIZE;
242 }
243
244 pcol_free(pcol);
245 EXOFS_DBGMSG2("readpages_done END\n");
246 return ret;
247 }
248
249 /* callback of async reads */
250 static void readpages_done(struct ore_io_state *ios, void *p)
251 {
252 struct page_collect *pcol = p;
253
254 __readpages_done(pcol);
255 atomic_dec(&pcol->sbi->s_curr_pending);
256 kfree(pcol);
257 }
258
259 static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
260 {
261 int i;
262
263 for (i = 0; i < pcol->nr_pages; i++) {
264 struct page *page = pcol->pages[i];
265
266 if (rw == READ)
267 update_read_page(page, ret);
268 else
269 update_write_page(page, ret);
270
271 unlock_page(page);
272 }
273 }
274
275 static int _maybe_not_all_in_one_io(struct ore_io_state *ios,
276 struct page_collect *pcol_src, struct page_collect *pcol)
277 {
278 /* length was wrong or offset was not page aligned */
279 BUG_ON(pcol_src->nr_pages < ios->nr_pages);
280
281 if (pcol_src->nr_pages > ios->nr_pages) {
282 struct page **src_page;
283 unsigned pages_less = pcol_src->nr_pages - ios->nr_pages;
284 unsigned long len_less = pcol_src->length - ios->length;
285 unsigned i;
286 int ret;
287
288 /* This IO was trimmed */
289 pcol_src->nr_pages = ios->nr_pages;
290 pcol_src->length = ios->length;
291
292 /* Left over pages are passed to the next io */
293 pcol->expected_pages += pages_less;
294 pcol->nr_pages = pages_less;
295 pcol->length = len_less;
296 src_page = pcol_src->pages + pcol_src->nr_pages;
297 pcol->pg_first = (*src_page)->index;
298
299 ret = pcol_try_alloc(pcol);
300 if (unlikely(ret))
301 return ret;
302
303 for (i = 0; i < pages_less; ++i)
304 pcol->pages[i] = *src_page++;
305
306 EXOFS_DBGMSG("Length was adjusted nr_pages=0x%x "
307 "pages_less=0x%x expected_pages=0x%x "
308 "next_offset=0x%llx next_len=0x%lx\n",
309 pcol_src->nr_pages, pages_less, pcol->expected_pages,
310 pcol->pg_first * PAGE_SIZE, pcol->length);
311 }
312 return 0;
313 }
314
315 static int read_exec(struct page_collect *pcol)
316 {
317 struct exofs_i_info *oi = exofs_i(pcol->inode);
318 struct ore_io_state *ios;
319 struct page_collect *pcol_copy = NULL;
320 int ret;
321
322 if (!pcol->pages)
323 return 0;
324
325 if (!pcol->ios) {
326 int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true,
327 pcol->pg_first << PAGE_CACHE_SHIFT,
328 pcol->length, &pcol->ios);
329
330 if (ret)
331 return ret;
332 }
333
334 ios = pcol->ios;
335 ios->pages = pcol->pages;
336
337 if (pcol->read_4_write) {
338 ore_read(pcol->ios);
339 return __readpages_done(pcol);
340 }
341
342 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
343 if (!pcol_copy) {
344 ret = -ENOMEM;
345 goto err;
346 }
347
348 *pcol_copy = *pcol;
349 ios->done = readpages_done;
350 ios->private = pcol_copy;
351
352 /* pages ownership was passed to pcol_copy */
353 _pcol_reset(pcol);
354
355 ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
356 if (unlikely(ret))
357 goto err;
358
359 EXOFS_DBGMSG2("read_exec(0x%lx) offset=0x%llx length=0x%llx\n",
360 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
361
362 ret = ore_read(ios);
363 if (unlikely(ret))
364 goto err;
365
366 atomic_inc(&pcol->sbi->s_curr_pending);
367
368 return 0;
369
370 err:
371 if (!pcol->read_4_write)
372 _unlock_pcol_pages(pcol, ret, READ);
373
374 pcol_free(pcol);
375
376 kfree(pcol_copy);
377 return ret;
378 }
379
380 /* readpage_strip is called either directly from readpage() or by the VFS from
381 * within read_cache_pages(), to add one more page to be read. It will try to
382 * collect as many contiguous pages as posible. If a discontinuity is
383 * encountered, or it runs out of resources, it will submit the previous segment
384 * and will start a new collection. Eventually caller must submit the last
385 * segment if present.
386 */
387 static int readpage_strip(void *data, struct page *page)
388 {
389 struct page_collect *pcol = data;
390 struct inode *inode = pcol->inode;
391 struct exofs_i_info *oi = exofs_i(inode);
392 loff_t i_size = i_size_read(inode);
393 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
394 size_t len;
395 int ret;
396
397 /* FIXME: Just for debugging, will be removed */
398 if (PageUptodate(page))
399 EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
400 page->index);
401
402 if (page->index < end_index)
403 len = PAGE_CACHE_SIZE;
404 else if (page->index == end_index)
405 len = i_size & ~PAGE_CACHE_MASK;
406 else
407 len = 0;
408
409 if (!len || !obj_created(oi)) {
410 /* this will be out of bounds, or doesn't exist yet.
411 * Current page is cleared and the request is split
412 */
413 clear_highpage(page);
414
415 SetPageUptodate(page);
416 if (PageError(page))
417 ClearPageError(page);
418
419 if (!pcol->read_4_write)
420 unlock_page(page);
421 EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx "
422 "read_4_write=%d index=0x%lx end_index=0x%lx "
423 "splitting\n", inode->i_ino, len,
424 pcol->read_4_write, page->index, end_index);
425
426 return read_exec(pcol);
427 }
428
429 try_again:
430
431 if (unlikely(pcol->pg_first == -1)) {
432 pcol->pg_first = page->index;
433 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
434 page->index)) {
435 /* Discontinuity detected, split the request */
436 ret = read_exec(pcol);
437 if (unlikely(ret))
438 goto fail;
439 goto try_again;
440 }
441
442 if (!pcol->pages) {
443 ret = pcol_try_alloc(pcol);
444 if (unlikely(ret))
445 goto fail;
446 }
447
448 if (len != PAGE_CACHE_SIZE)
449 zero_user(page, len, PAGE_CACHE_SIZE - len);
450
451 EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
452 inode->i_ino, page->index, len);
453
454 ret = pcol_add_page(pcol, page, len);
455 if (ret) {
456 EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
457 "this_len=0x%zx nr_pages=%u length=0x%lx\n",
458 page, len, pcol->nr_pages, pcol->length);
459
460 /* split the request, and start again with current page */
461 ret = read_exec(pcol);
462 if (unlikely(ret))
463 goto fail;
464
465 goto try_again;
466 }
467
468 return 0;
469
470 fail:
471 /* SetPageError(page); ??? */
472 unlock_page(page);
473 return ret;
474 }
475
476 static int exofs_readpages(struct file *file, struct address_space *mapping,
477 struct list_head *pages, unsigned nr_pages)
478 {
479 struct page_collect pcol;
480 int ret;
481
482 _pcol_init(&pcol, nr_pages, mapping->host);
483
484 ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
485 if (ret) {
486 EXOFS_ERR("read_cache_pages => %d\n", ret);
487 return ret;
488 }
489
490 ret = read_exec(&pcol);
491 if (unlikely(ret))
492 return ret;
493
494 return read_exec(&pcol);
495 }
496
497 static int _readpage(struct page *page, bool read_4_write)
498 {
499 struct page_collect pcol;
500 int ret;
501
502 _pcol_init(&pcol, 1, page->mapping->host);
503
504 pcol.read_4_write = read_4_write;
505 ret = readpage_strip(&pcol, page);
506 if (ret) {
507 EXOFS_ERR("_readpage => %d\n", ret);
508 return ret;
509 }
510
511 return read_exec(&pcol);
512 }
513
514 /*
515 * We don't need the file
516 */
517 static int exofs_readpage(struct file *file, struct page *page)
518 {
519 return _readpage(page, false);
520 }
521
522 /* Callback for osd_write. All writes are asynchronous */
523 static void writepages_done(struct ore_io_state *ios, void *p)
524 {
525 struct page_collect *pcol = p;
526 int i;
527 u64 resid;
528 u64 good_bytes;
529 u64 length = 0;
530 int ret = ore_check_io(ios, &resid);
531
532 atomic_dec(&pcol->sbi->s_curr_pending);
533
534 if (likely(!ret)) {
535 good_bytes = pcol->length;
536 ret = PAGE_WAS_NOT_IN_IO;
537 } else {
538 good_bytes = pcol->length - resid;
539 }
540 if (good_bytes > pcol->ios->length)
541 good_bytes = pcol->ios->length;
542
543 EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
544 " length=0x%lx nr_pages=%u\n",
545 pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
546 pcol->nr_pages);
547
548 for (i = 0; i < pcol->nr_pages; i++) {
549 struct page *page = pcol->pages[i];
550 struct inode *inode = page->mapping->host;
551 int page_stat;
552
553 if (inode != pcol->inode)
554 continue; /* osd might add more pages to a bio */
555
556 if (likely(length < good_bytes))
557 page_stat = 0;
558 else
559 page_stat = ret;
560
561 update_write_page(page, page_stat);
562 unlock_page(page);
563 EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n",
564 inode->i_ino, page->index, page_stat);
565
566 length += PAGE_SIZE;
567 }
568
569 pcol_free(pcol);
570 kfree(pcol);
571 EXOFS_DBGMSG2("writepages_done END\n");
572 }
573
574 static int write_exec(struct page_collect *pcol)
575 {
576 struct exofs_i_info *oi = exofs_i(pcol->inode);
577 struct ore_io_state *ios;
578 struct page_collect *pcol_copy = NULL;
579 int ret;
580
581 if (!pcol->pages)
582 return 0;
583
584 BUG_ON(pcol->ios);
585 ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false,
586 pcol->pg_first << PAGE_CACHE_SHIFT,
587 pcol->length, &pcol->ios);
588 if (unlikely(ret))
589 goto err;
590
591 pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
592 if (!pcol_copy) {
593 EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
594 ret = -ENOMEM;
595 goto err;
596 }
597
598 *pcol_copy = *pcol;
599
600 ios = pcol->ios;
601 ios->pages = pcol_copy->pages;
602 ios->done = writepages_done;
603 ios->private = pcol_copy;
604
605 /* pages ownership was passed to pcol_copy */
606 _pcol_reset(pcol);
607
608 ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
609 if (unlikely(ret))
610 goto err;
611
612 EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n",
613 pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
614
615 ret = ore_write(ios);
616 if (unlikely(ret)) {
617 EXOFS_ERR("write_exec: ore_write() Failed\n");
618 goto err;
619 }
620
621 atomic_inc(&pcol->sbi->s_curr_pending);
622 return 0;
623
624 err:
625 _unlock_pcol_pages(pcol, ret, WRITE);
626 pcol_free(pcol);
627 kfree(pcol_copy);
628
629 return ret;
630 }
631
632 /* writepage_strip is called either directly from writepage() or by the VFS from
633 * within write_cache_pages(), to add one more page to be written to storage.
634 * It will try to collect as many contiguous pages as possible. If a
635 * discontinuity is encountered or it runs out of resources it will submit the
636 * previous segment and will start a new collection.
637 * Eventually caller must submit the last segment if present.
638 */
639 static int writepage_strip(struct page *page,
640 struct writeback_control *wbc_unused, void *data)
641 {
642 struct page_collect *pcol = data;
643 struct inode *inode = pcol->inode;
644 struct exofs_i_info *oi = exofs_i(inode);
645 loff_t i_size = i_size_read(inode);
646 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
647 size_t len;
648 int ret;
649
650 BUG_ON(!PageLocked(page));
651
652 ret = wait_obj_created(oi);
653 if (unlikely(ret))
654 goto fail;
655
656 if (page->index < end_index)
657 /* in this case, the page is within the limits of the file */
658 len = PAGE_CACHE_SIZE;
659 else {
660 len = i_size & ~PAGE_CACHE_MASK;
661
662 if (page->index > end_index || !len) {
663 /* in this case, the page is outside the limits
664 * (truncate in progress)
665 */
666 ret = write_exec(pcol);
667 if (unlikely(ret))
668 goto fail;
669 if (PageError(page))
670 ClearPageError(page);
671 unlock_page(page);
672 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
673 "outside the limits\n",
674 inode->i_ino, page->index);
675 return 0;
676 }
677 }
678
679 try_again:
680
681 if (unlikely(pcol->pg_first == -1)) {
682 pcol->pg_first = page->index;
683 } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
684 page->index)) {
685 /* Discontinuity detected, split the request */
686 ret = write_exec(pcol);
687 if (unlikely(ret))
688 goto fail;
689
690 EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
691 inode->i_ino, page->index);
692 goto try_again;
693 }
694
695 if (!pcol->pages) {
696 ret = pcol_try_alloc(pcol);
697 if (unlikely(ret))
698 goto fail;
699 }
700
701 EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
702 inode->i_ino, page->index, len);
703
704 ret = pcol_add_page(pcol, page, len);
705 if (unlikely(ret)) {
706 EXOFS_DBGMSG2("Failed pcol_add_page "
707 "nr_pages=%u total_length=0x%lx\n",
708 pcol->nr_pages, pcol->length);
709
710 /* split the request, next loop will start again */
711 ret = write_exec(pcol);
712 if (unlikely(ret)) {
713 EXOFS_DBGMSG("write_exec failed => %d", ret);
714 goto fail;
715 }
716
717 goto try_again;
718 }
719
720 BUG_ON(PageWriteback(page));
721 set_page_writeback(page);
722
723 return 0;
724
725 fail:
726 EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
727 inode->i_ino, page->index, ret);
728 set_bit(AS_EIO, &page->mapping->flags);
729 unlock_page(page);
730 return ret;
731 }
732
733 static int exofs_writepages(struct address_space *mapping,
734 struct writeback_control *wbc)
735 {
736 struct page_collect pcol;
737 long start, end, expected_pages;
738 int ret;
739
740 start = wbc->range_start >> PAGE_CACHE_SHIFT;
741 end = (wbc->range_end == LLONG_MAX) ?
742 start + mapping->nrpages :
743 wbc->range_end >> PAGE_CACHE_SHIFT;
744
745 if (start || end)
746 expected_pages = end - start + 1;
747 else
748 expected_pages = mapping->nrpages;
749
750 if (expected_pages < 32L)
751 expected_pages = 32L;
752
753 EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
754 "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
755 mapping->host->i_ino, wbc->range_start, wbc->range_end,
756 mapping->nrpages, start, end, expected_pages);
757
758 _pcol_init(&pcol, expected_pages, mapping->host);
759
760 ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
761 if (unlikely(ret)) {
762 EXOFS_ERR("write_cache_pages => %d\n", ret);
763 return ret;
764 }
765
766 ret = write_exec(&pcol);
767 if (unlikely(ret))
768 return ret;
769
770 if (wbc->sync_mode == WB_SYNC_ALL) {
771 return write_exec(&pcol); /* pump the last reminder */
772 } else if (pcol.nr_pages) {
773 /* not SYNC let the reminder join the next writeout */
774 unsigned i;
775
776 for (i = 0; i < pcol.nr_pages; i++) {
777 struct page *page = pcol.pages[i];
778
779 end_page_writeback(page);
780 set_page_dirty(page);
781 unlock_page(page);
782 }
783 }
784 return 0;
785 }
786
787 static int exofs_writepage(struct page *page, struct writeback_control *wbc)
788 {
789 struct page_collect pcol;
790 int ret;
791
792 _pcol_init(&pcol, 1, page->mapping->host);
793
794 ret = writepage_strip(page, NULL, &pcol);
795 if (ret) {
796 EXOFS_ERR("exofs_writepage => %d\n", ret);
797 return ret;
798 }
799
800 return write_exec(&pcol);
801 }
802
803 /* i_mutex held using inode->i_size directly */
804 static void _write_failed(struct inode *inode, loff_t to)
805 {
806 if (to > inode->i_size)
807 truncate_pagecache(inode, to, inode->i_size);
808 }
809
810 int exofs_write_begin(struct file *file, struct address_space *mapping,
811 loff_t pos, unsigned len, unsigned flags,
812 struct page **pagep, void **fsdata)
813 {
814 int ret = 0;
815 struct page *page;
816
817 page = *pagep;
818 if (page == NULL) {
819 ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
820 fsdata);
821 if (ret) {
822 EXOFS_DBGMSG("simple_write_begin failed\n");
823 goto out;
824 }
825
826 page = *pagep;
827 }
828
829 /* read modify write */
830 if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
831 loff_t i_size = i_size_read(mapping->host);
832 pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
833 size_t rlen;
834
835 if (page->index < end_index)
836 rlen = PAGE_CACHE_SIZE;
837 else if (page->index == end_index)
838 rlen = i_size & ~PAGE_CACHE_MASK;
839 else
840 rlen = 0;
841
842 if (!rlen) {
843 clear_highpage(page);
844 SetPageUptodate(page);
845 goto out;
846 }
847
848 ret = _readpage(page, true);
849 if (ret) {
850 /*SetPageError was done by _readpage. Is it ok?*/
851 unlock_page(page);
852 EXOFS_DBGMSG("__readpage failed\n");
853 }
854 }
855 out:
856 if (unlikely(ret))
857 _write_failed(mapping->host, pos + len);
858
859 return ret;
860 }
861
862 static int exofs_write_begin_export(struct file *file,
863 struct address_space *mapping,
864 loff_t pos, unsigned len, unsigned flags,
865 struct page **pagep, void **fsdata)
866 {
867 *pagep = NULL;
868
869 return exofs_write_begin(file, mapping, pos, len, flags, pagep,
870 fsdata);
871 }
872
873 static int exofs_write_end(struct file *file, struct address_space *mapping,
874 loff_t pos, unsigned len, unsigned copied,
875 struct page *page, void *fsdata)
876 {
877 struct inode *inode = mapping->host;
878 /* According to comment in simple_write_end i_mutex is held */
879 loff_t i_size = inode->i_size;
880 int ret;
881
882 ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
883 if (unlikely(ret))
884 _write_failed(inode, pos + len);
885
886 /* TODO: once simple_write_end marks inode dirty remove */
887 if (i_size != inode->i_size)
888 mark_inode_dirty(inode);
889 return ret;
890 }
891
892 static int exofs_releasepage(struct page *page, gfp_t gfp)
893 {
894 EXOFS_DBGMSG("page 0x%lx\n", page->index);
895 WARN_ON(1);
896 return 0;
897 }
898
899 static void exofs_invalidatepage(struct page *page, unsigned long offset)
900 {
901 EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset);
902 WARN_ON(1);
903 }
904
905 const struct address_space_operations exofs_aops = {
906 .readpage = exofs_readpage,
907 .readpages = exofs_readpages,
908 .writepage = exofs_writepage,
909 .writepages = exofs_writepages,
910 .write_begin = exofs_write_begin_export,
911 .write_end = exofs_write_end,
912 .releasepage = exofs_releasepage,
913 .set_page_dirty = __set_page_dirty_nobuffers,
914 .invalidatepage = exofs_invalidatepage,
915
916 /* Not implemented Yet */
917 .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
918 .direct_IO = NULL, /* TODO: Should be trivial to do */
919
920 /* With these NULL has special meaning or default is not exported */
921 .get_xip_mem = NULL,
922 .migratepage = NULL,
923 .launder_page = NULL,
924 .is_partially_uptodate = NULL,
925 .error_remove_page = NULL,
926 };
927
928 /******************************************************************************
929 * INODE OPERATIONS
930 *****************************************************************************/
931
932 /*
933 * Test whether an inode is a fast symlink.
934 */
935 static inline int exofs_inode_is_fast_symlink(struct inode *inode)
936 {
937 struct exofs_i_info *oi = exofs_i(inode);
938
939 return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
940 }
941
942 static int _do_truncate(struct inode *inode, loff_t newsize)
943 {
944 struct exofs_i_info *oi = exofs_i(inode);
945 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
946 int ret;
947
948 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
949
950 ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize);
951 if (likely(!ret))
952 truncate_setsize(inode, newsize);
953
954 EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n",
955 inode->i_ino, newsize, ret);
956 return ret;
957 }
958
959 /*
960 * Set inode attributes - update size attribute on OSD if needed,
961 * otherwise just call generic functions.
962 */
963 int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
964 {
965 struct inode *inode = dentry->d_inode;
966 int error;
967
968 /* if we are about to modify an object, and it hasn't been
969 * created yet, wait
970 */
971 error = wait_obj_created(exofs_i(inode));
972 if (unlikely(error))
973 return error;
974
975 error = inode_change_ok(inode, iattr);
976 if (unlikely(error))
977 return error;
978
979 if ((iattr->ia_valid & ATTR_SIZE) &&
980 iattr->ia_size != i_size_read(inode)) {
981 error = _do_truncate(inode, iattr->ia_size);
982 if (unlikely(error))
983 return error;
984 }
985
986 setattr_copy(inode, iattr);
987 mark_inode_dirty(inode);
988 return 0;
989 }
990
991 static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
992 EXOFS_APAGE_FS_DATA,
993 EXOFS_ATTR_INODE_FILE_LAYOUT,
994 0);
995 static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
996 EXOFS_APAGE_FS_DATA,
997 EXOFS_ATTR_INODE_DIR_LAYOUT,
998 0);
999
1000 /*
1001 * Read the Linux inode info from the OSD, and return it as is. In exofs the
1002 * inode info is in an application specific page/attribute of the osd-object.
1003 */
1004 static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
1005 struct exofs_fcb *inode)
1006 {
1007 struct exofs_sb_info *sbi = sb->s_fs_info;
1008 struct osd_attr attrs[] = {
1009 [0] = g_attr_inode_data,
1010 [1] = g_attr_inode_file_layout,
1011 [2] = g_attr_inode_dir_layout,
1012 };
1013 struct ore_io_state *ios;
1014 struct exofs_on_disk_inode_layout *layout;
1015 int ret;
1016
1017 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1018 if (unlikely(ret)) {
1019 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1020 return ret;
1021 }
1022
1023 attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1024 attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
1025
1026 ios->in_attr = attrs;
1027 ios->in_attr_len = ARRAY_SIZE(attrs);
1028
1029 ret = ore_read(ios);
1030 if (unlikely(ret)) {
1031 EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
1032 _LLU(oi->one_comp.obj.id), ret);
1033 memset(inode, 0, sizeof(*inode));
1034 inode->i_mode = 0040000 | (0777 & ~022);
1035 /* If object is lost on target we might as well enable it's
1036 * delete.
1037 */
1038 if ((ret == -ENOENT) || (ret == -EINVAL))
1039 ret = 0;
1040 goto out;
1041 }
1042
1043 ret = extract_attr_from_ios(ios, &attrs[0]);
1044 if (ret) {
1045 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1046 goto out;
1047 }
1048 WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
1049 memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
1050
1051 ret = extract_attr_from_ios(ios, &attrs[1]);
1052 if (ret) {
1053 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1054 goto out;
1055 }
1056 if (attrs[1].len) {
1057 layout = attrs[1].val_ptr;
1058 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1059 EXOFS_ERR("%s: unsupported files layout %d\n",
1060 __func__, layout->gen_func);
1061 ret = -ENOTSUPP;
1062 goto out;
1063 }
1064 }
1065
1066 ret = extract_attr_from_ios(ios, &attrs[2]);
1067 if (ret) {
1068 EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
1069 goto out;
1070 }
1071 if (attrs[2].len) {
1072 layout = attrs[2].val_ptr;
1073 if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
1074 EXOFS_ERR("%s: unsupported meta-data layout %d\n",
1075 __func__, layout->gen_func);
1076 ret = -ENOTSUPP;
1077 goto out;
1078 }
1079 }
1080
1081 out:
1082 ore_put_io_state(ios);
1083 return ret;
1084 }
1085
1086 static void __oi_init(struct exofs_i_info *oi)
1087 {
1088 init_waitqueue_head(&oi->i_wq);
1089 oi->i_flags = 0;
1090 }
1091 /*
1092 * Fill in an inode read from the OSD and set it up for use
1093 */
1094 struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
1095 {
1096 struct exofs_i_info *oi;
1097 struct exofs_fcb fcb;
1098 struct inode *inode;
1099 int ret;
1100
1101 inode = iget_locked(sb, ino);
1102 if (!inode)
1103 return ERR_PTR(-ENOMEM);
1104 if (!(inode->i_state & I_NEW))
1105 return inode;
1106 oi = exofs_i(inode);
1107 __oi_init(oi);
1108 exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1109 exofs_oi_objno(oi));
1110
1111 /* read the inode from the osd */
1112 ret = exofs_get_inode(sb, oi, &fcb);
1113 if (ret)
1114 goto bad_inode;
1115
1116 set_obj_created(oi);
1117
1118 /* copy stuff from on-disk struct to in-memory struct */
1119 inode->i_mode = le16_to_cpu(fcb.i_mode);
1120 inode->i_uid = le32_to_cpu(fcb.i_uid);
1121 inode->i_gid = le32_to_cpu(fcb.i_gid);
1122 inode->i_nlink = le16_to_cpu(fcb.i_links_count);
1123 inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
1124 inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
1125 inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
1126 inode->i_ctime.tv_nsec =
1127 inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
1128 oi->i_commit_size = le64_to_cpu(fcb.i_size);
1129 i_size_write(inode, oi->i_commit_size);
1130 inode->i_blkbits = EXOFS_BLKSHIFT;
1131 inode->i_generation = le32_to_cpu(fcb.i_generation);
1132
1133 oi->i_dir_start_lookup = 0;
1134
1135 if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
1136 ret = -ESTALE;
1137 goto bad_inode;
1138 }
1139
1140 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1141 if (fcb.i_data[0])
1142 inode->i_rdev =
1143 old_decode_dev(le32_to_cpu(fcb.i_data[0]));
1144 else
1145 inode->i_rdev =
1146 new_decode_dev(le32_to_cpu(fcb.i_data[1]));
1147 } else {
1148 memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
1149 }
1150
1151 inode->i_mapping->backing_dev_info = sb->s_bdi;
1152 if (S_ISREG(inode->i_mode)) {
1153 inode->i_op = &exofs_file_inode_operations;
1154 inode->i_fop = &exofs_file_operations;
1155 inode->i_mapping->a_ops = &exofs_aops;
1156 } else if (S_ISDIR(inode->i_mode)) {
1157 inode->i_op = &exofs_dir_inode_operations;
1158 inode->i_fop = &exofs_dir_operations;
1159 inode->i_mapping->a_ops = &exofs_aops;
1160 } else if (S_ISLNK(inode->i_mode)) {
1161 if (exofs_inode_is_fast_symlink(inode))
1162 inode->i_op = &exofs_fast_symlink_inode_operations;
1163 else {
1164 inode->i_op = &exofs_symlink_inode_operations;
1165 inode->i_mapping->a_ops = &exofs_aops;
1166 }
1167 } else {
1168 inode->i_op = &exofs_special_inode_operations;
1169 if (fcb.i_data[0])
1170 init_special_inode(inode, inode->i_mode,
1171 old_decode_dev(le32_to_cpu(fcb.i_data[0])));
1172 else
1173 init_special_inode(inode, inode->i_mode,
1174 new_decode_dev(le32_to_cpu(fcb.i_data[1])));
1175 }
1176
1177 unlock_new_inode(inode);
1178 return inode;
1179
1180 bad_inode:
1181 iget_failed(inode);
1182 return ERR_PTR(ret);
1183 }
1184
1185 int __exofs_wait_obj_created(struct exofs_i_info *oi)
1186 {
1187 if (!obj_created(oi)) {
1188 EXOFS_DBGMSG("!obj_created\n");
1189 BUG_ON(!obj_2bcreated(oi));
1190 wait_event(oi->i_wq, obj_created(oi));
1191 EXOFS_DBGMSG("wait_event done\n");
1192 }
1193 return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
1194 }
1195
1196 /*
1197 * Callback function from exofs_new_inode(). The important thing is that we
1198 * set the obj_created flag so that other methods know that the object exists on
1199 * the OSD.
1200 */
1201 static void create_done(struct ore_io_state *ios, void *p)
1202 {
1203 struct inode *inode = p;
1204 struct exofs_i_info *oi = exofs_i(inode);
1205 struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
1206 int ret;
1207
1208 ret = ore_check_io(ios, NULL);
1209 ore_put_io_state(ios);
1210
1211 atomic_dec(&sbi->s_curr_pending);
1212
1213 if (unlikely(ret)) {
1214 EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx",
1215 _LLU(exofs_oi_objno(oi)),
1216 _LLU(oi->one_comp.obj.partition));
1217 /*TODO: When FS is corrupted creation can fail, object already
1218 * exist. Get rid of this asynchronous creation, if exist
1219 * increment the obj counter and try the next object. Until we
1220 * succeed. All these dangling objects will be made into lost
1221 * files by chkfs.exofs
1222 */
1223 }
1224
1225 set_obj_created(oi);
1226
1227 wake_up(&oi->i_wq);
1228 }
1229
1230 /*
1231 * Set up a new inode and create an object for it on the OSD
1232 */
1233 struct inode *exofs_new_inode(struct inode *dir, int mode)
1234 {
1235 struct super_block *sb = dir->i_sb;
1236 struct exofs_sb_info *sbi = sb->s_fs_info;
1237 struct inode *inode;
1238 struct exofs_i_info *oi;
1239 struct ore_io_state *ios;
1240 int ret;
1241
1242 inode = new_inode(sb);
1243 if (!inode)
1244 return ERR_PTR(-ENOMEM);
1245
1246 oi = exofs_i(inode);
1247 __oi_init(oi);
1248
1249 set_obj_2bcreated(oi);
1250
1251 inode->i_mapping->backing_dev_info = sb->s_bdi;
1252 inode_init_owner(inode, dir, mode);
1253 inode->i_ino = sbi->s_nextid++;
1254 inode->i_blkbits = EXOFS_BLKSHIFT;
1255 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1256 oi->i_commit_size = inode->i_size = 0;
1257 spin_lock(&sbi->s_next_gen_lock);
1258 inode->i_generation = sbi->s_next_generation++;
1259 spin_unlock(&sbi->s_next_gen_lock);
1260 insert_inode_hash(inode);
1261
1262 exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
1263 exofs_oi_objno(oi));
1264 exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
1265
1266 mark_inode_dirty(inode);
1267
1268 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1269 if (unlikely(ret)) {
1270 EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n");
1271 return ERR_PTR(ret);
1272 }
1273
1274 ios->done = create_done;
1275 ios->private = inode;
1276
1277 ret = ore_create(ios);
1278 if (ret) {
1279 ore_put_io_state(ios);
1280 return ERR_PTR(ret);
1281 }
1282 atomic_inc(&sbi->s_curr_pending);
1283
1284 return inode;
1285 }
1286
1287 /*
1288 * struct to pass two arguments to update_inode's callback
1289 */
1290 struct updatei_args {
1291 struct exofs_sb_info *sbi;
1292 struct exofs_fcb fcb;
1293 };
1294
1295 /*
1296 * Callback function from exofs_update_inode().
1297 */
1298 static void updatei_done(struct ore_io_state *ios, void *p)
1299 {
1300 struct updatei_args *args = p;
1301
1302 ore_put_io_state(ios);
1303
1304 atomic_dec(&args->sbi->s_curr_pending);
1305
1306 kfree(args);
1307 }
1308
1309 /*
1310 * Write the inode to the OSD. Just fill up the struct, and set the attribute
1311 * synchronously or asynchronously depending on the do_sync flag.
1312 */
1313 static int exofs_update_inode(struct inode *inode, int do_sync)
1314 {
1315 struct exofs_i_info *oi = exofs_i(inode);
1316 struct super_block *sb = inode->i_sb;
1317 struct exofs_sb_info *sbi = sb->s_fs_info;
1318 struct ore_io_state *ios;
1319 struct osd_attr attr;
1320 struct exofs_fcb *fcb;
1321 struct updatei_args *args;
1322 int ret;
1323
1324 args = kzalloc(sizeof(*args), GFP_KERNEL);
1325 if (!args) {
1326 EXOFS_DBGMSG("Failed kzalloc of args\n");
1327 return -ENOMEM;
1328 }
1329
1330 fcb = &args->fcb;
1331
1332 fcb->i_mode = cpu_to_le16(inode->i_mode);
1333 fcb->i_uid = cpu_to_le32(inode->i_uid);
1334 fcb->i_gid = cpu_to_le32(inode->i_gid);
1335 fcb->i_links_count = cpu_to_le16(inode->i_nlink);
1336 fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
1337 fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
1338 fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
1339 oi->i_commit_size = i_size_read(inode);
1340 fcb->i_size = cpu_to_le64(oi->i_commit_size);
1341 fcb->i_generation = cpu_to_le32(inode->i_generation);
1342
1343 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
1344 if (old_valid_dev(inode->i_rdev)) {
1345 fcb->i_data[0] =
1346 cpu_to_le32(old_encode_dev(inode->i_rdev));
1347 fcb->i_data[1] = 0;
1348 } else {
1349 fcb->i_data[0] = 0;
1350 fcb->i_data[1] =
1351 cpu_to_le32(new_encode_dev(inode->i_rdev));
1352 fcb->i_data[2] = 0;
1353 }
1354 } else
1355 memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
1356
1357 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1358 if (unlikely(ret)) {
1359 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
1360 goto free_args;
1361 }
1362
1363 attr = g_attr_inode_data;
1364 attr.val_ptr = fcb;
1365 ios->out_attr_len = 1;
1366 ios->out_attr = &attr;
1367
1368 wait_obj_created(oi);
1369
1370 if (!do_sync) {
1371 args->sbi = sbi;
1372 ios->done = updatei_done;
1373 ios->private = args;
1374 }
1375
1376 ret = ore_write(ios);
1377 if (!do_sync && !ret) {
1378 atomic_inc(&sbi->s_curr_pending);
1379 goto out; /* deallocation in updatei_done */
1380 }
1381
1382 ore_put_io_state(ios);
1383 free_args:
1384 kfree(args);
1385 out:
1386 EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
1387 inode->i_ino, do_sync, ret);
1388 return ret;
1389 }
1390
1391 int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
1392 {
1393 /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */
1394 return exofs_update_inode(inode, 1);
1395 }
1396
1397 /*
1398 * Callback function from exofs_delete_inode() - don't have much cleaning up to
1399 * do.
1400 */
1401 static void delete_done(struct ore_io_state *ios, void *p)
1402 {
1403 struct exofs_sb_info *sbi = p;
1404
1405 ore_put_io_state(ios);
1406
1407 atomic_dec(&sbi->s_curr_pending);
1408 }
1409
1410 /*
1411 * Called when the refcount of an inode reaches zero. We remove the object
1412 * from the OSD here. We make sure the object was created before we try and
1413 * delete it.
1414 */
1415 void exofs_evict_inode(struct inode *inode)
1416 {
1417 struct exofs_i_info *oi = exofs_i(inode);
1418 struct super_block *sb = inode->i_sb;
1419 struct exofs_sb_info *sbi = sb->s_fs_info;
1420 struct ore_io_state *ios;
1421 int ret;
1422
1423 truncate_inode_pages(&inode->i_data, 0);
1424
1425 /* TODO: should do better here */
1426 if (inode->i_nlink || is_bad_inode(inode))
1427 goto no_delete;
1428
1429 inode->i_size = 0;
1430 end_writeback(inode);
1431
1432 /* if we are deleting an obj that hasn't been created yet, wait.
1433 * This also makes sure that create_done cannot be called with an
1434 * already evicted inode.
1435 */
1436 wait_obj_created(oi);
1437 /* ignore the error, attempt a remove anyway */
1438
1439 /* Now Remove the OSD objects */
1440 ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
1441 if (unlikely(ret)) {
1442 EXOFS_ERR("%s: ore_get_io_state failed\n", __func__);
1443 return;
1444 }
1445
1446 ios->done = delete_done;
1447 ios->private = sbi;
1448
1449 ret = ore_remove(ios);
1450 if (ret) {
1451 EXOFS_ERR("%s: ore_remove failed\n", __func__);
1452 ore_put_io_state(ios);
1453 return;
1454 }
1455 atomic_inc(&sbi->s_curr_pending);
1456
1457 return;
1458
1459 no_delete:
1460 end_writeback(inode);
1461 }
Linus' kernel tree