Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze
[linux-3.10.git] / fs / exofs / inode.c
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 {MAX_PAGES_KMALLOC = PAGE_SIZE / sizeof(struct page *), };
41
42 unsigned 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
52 struct 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
69 static 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
88 static 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
107 static 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
128 static 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
139 static 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
150 enum {PAGE_WAS_NOT_IN_IO = 17};
151 static 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
182 static 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  */
197 static 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 */
245 static 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
254 static 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
270 static 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
310 static 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
365 err:
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  */
382 static 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
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 = 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
601 static 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
613 static const struct _ore_r4w_op _r4w_op = {
614         .get_page = &__r4w_get_page,
615         .put_page = &__r4w_put_page,
616 };
617
618 static 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
669 err:
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  */
684 static 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
724 try_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
770 fail:
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
778 static 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 /*
833 static 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 */
850 static 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
856 int 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         }
901 out:
902         if (unlikely(ret))
903                 _write_failed(mapping->host, pos + len);
904
905         return ret;
906 }
907
908 static 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
919 static 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
938 static 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
945 static 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
951 const 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  */
981 static 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
988 static 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  */
1009 int 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
1037 static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
1038         EXOFS_APAGE_FS_DATA,
1039         EXOFS_ATTR_INODE_FILE_LAYOUT,
1040         0);
1041 static 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  */
1050 static 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
1127 out:
1128         ore_put_io_state(ios);
1129         return ret;
1130 }
1131
1132 static 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  */
1140 struct 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
1226 bad_inode:
1227         iget_failed(inode);
1228         return ERR_PTR(ret);
1229 }
1230
1231 int __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  */
1247 static 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  */
1279 struct 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  */
1336 struct updatei_args {
1337         struct exofs_sb_info    *sbi;
1338         struct exofs_fcb        fcb;
1339 };
1340
1341 /*
1342  * Callback function from exofs_update_inode().
1343  */
1344 static 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  */
1359 static 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);
1429 free_args:
1430         kfree(args);
1431 out:
1432         EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
1433                      inode->i_ino, do_sync, ret);
1434         return ret;
1435 }
1436
1437 int 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  */
1447 static 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  */
1461 void 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         end_writeback(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
1505 no_delete:
1506         end_writeback(inode);
1507 }