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e8062719 BH |
1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
e8062719 BH |
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/writeback.h> | |
35 | #include <linux/buffer_head.h> | |
beaec07b | 36 | #include <scsi/scsi_device.h> |
e8062719 BH |
37 | |
38 | #include "exofs.h" | |
39 | ||
40 | #ifdef CONFIG_EXOFS_DEBUG | |
41 | # define EXOFS_DEBUG_OBJ_ISIZE 1 | |
42 | #endif | |
43 | ||
fe33cc1e BH |
44 | #define EXOFS_DBGMSG2(M...) do {} while (0) |
45 | ||
beaec07b BH |
46 | struct page_collect { |
47 | struct exofs_sb_info *sbi; | |
48 | struct request_queue *req_q; | |
49 | struct inode *inode; | |
50 | unsigned expected_pages; | |
51 | ||
52 | struct bio *bio; | |
53 | unsigned nr_pages; | |
54 | unsigned long length; | |
55 | loff_t pg_first; /* keep 64bit also in 32-arches */ | |
56 | }; | |
57 | ||
58 | static void _pcol_init(struct page_collect *pcol, unsigned expected_pages, | |
59 | struct inode *inode) | |
60 | { | |
61 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
beaec07b BH |
62 | |
63 | pcol->sbi = sbi; | |
fc2fac5b | 64 | pcol->req_q = osd_request_queue(sbi->s_dev); |
beaec07b BH |
65 | pcol->inode = inode; |
66 | pcol->expected_pages = expected_pages; | |
67 | ||
68 | pcol->bio = NULL; | |
69 | pcol->nr_pages = 0; | |
70 | pcol->length = 0; | |
71 | pcol->pg_first = -1; | |
72 | ||
73 | EXOFS_DBGMSG("_pcol_init ino=0x%lx expected_pages=%u\n", inode->i_ino, | |
74 | expected_pages); | |
75 | } | |
76 | ||
77 | static void _pcol_reset(struct page_collect *pcol) | |
78 | { | |
79 | pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages); | |
80 | ||
81 | pcol->bio = NULL; | |
82 | pcol->nr_pages = 0; | |
83 | pcol->length = 0; | |
84 | pcol->pg_first = -1; | |
85 | EXOFS_DBGMSG("_pcol_reset ino=0x%lx expected_pages=%u\n", | |
86 | pcol->inode->i_ino, pcol->expected_pages); | |
87 | ||
88 | /* this is probably the end of the loop but in writes | |
89 | * it might not end here. don't be left with nothing | |
90 | */ | |
91 | if (!pcol->expected_pages) | |
92 | pcol->expected_pages = 128; | |
93 | } | |
94 | ||
95 | static int pcol_try_alloc(struct page_collect *pcol) | |
96 | { | |
97 | int pages = min_t(unsigned, pcol->expected_pages, BIO_MAX_PAGES); | |
98 | ||
99 | for (; pages; pages >>= 1) { | |
100 | pcol->bio = bio_alloc(GFP_KERNEL, pages); | |
101 | if (likely(pcol->bio)) | |
102 | return 0; | |
103 | } | |
104 | ||
105 | EXOFS_ERR("Failed to kcalloc expected_pages=%u\n", | |
106 | pcol->expected_pages); | |
107 | return -ENOMEM; | |
108 | } | |
109 | ||
110 | static void pcol_free(struct page_collect *pcol) | |
111 | { | |
112 | bio_put(pcol->bio); | |
113 | pcol->bio = NULL; | |
114 | } | |
115 | ||
116 | static int pcol_add_page(struct page_collect *pcol, struct page *page, | |
117 | unsigned len) | |
118 | { | |
119 | int added_len = bio_add_pc_page(pcol->req_q, pcol->bio, page, len, 0); | |
120 | if (unlikely(len != added_len)) | |
121 | return -ENOMEM; | |
122 | ||
123 | ++pcol->nr_pages; | |
124 | pcol->length += len; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static int update_read_page(struct page *page, int ret) | |
129 | { | |
130 | if (ret == 0) { | |
131 | /* Everything is OK */ | |
132 | SetPageUptodate(page); | |
133 | if (PageError(page)) | |
134 | ClearPageError(page); | |
135 | } else if (ret == -EFAULT) { | |
136 | /* In this case we were trying to read something that wasn't on | |
137 | * disk yet - return a page full of zeroes. This should be OK, | |
138 | * because the object should be empty (if there was a write | |
139 | * before this read, the read would be waiting with the page | |
140 | * locked */ | |
141 | clear_highpage(page); | |
142 | ||
143 | SetPageUptodate(page); | |
144 | if (PageError(page)) | |
145 | ClearPageError(page); | |
146 | ret = 0; /* recovered error */ | |
147 | EXOFS_DBGMSG("recovered read error\n"); | |
148 | } else /* Error */ | |
149 | SetPageError(page); | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | static void update_write_page(struct page *page, int ret) | |
155 | { | |
156 | if (ret) { | |
157 | mapping_set_error(page->mapping, ret); | |
158 | SetPageError(page); | |
159 | } | |
160 | end_page_writeback(page); | |
161 | } | |
162 | ||
163 | /* Called at the end of reads, to optionally unlock pages and update their | |
164 | * status. | |
165 | */ | |
166 | static int __readpages_done(struct osd_request *or, struct page_collect *pcol, | |
167 | bool do_unlock) | |
168 | { | |
169 | struct bio_vec *bvec; | |
170 | int i; | |
171 | u64 resid; | |
172 | u64 good_bytes; | |
173 | u64 length = 0; | |
174 | int ret = exofs_check_ok_resid(or, &resid, NULL); | |
175 | ||
176 | osd_end_request(or); | |
177 | ||
178 | if (likely(!ret)) | |
179 | good_bytes = pcol->length; | |
180 | else if (!resid) | |
181 | good_bytes = 0; | |
182 | else | |
183 | good_bytes = pcol->length - resid; | |
184 | ||
185 | EXOFS_DBGMSG("readpages_done(0x%lx) good_bytes=0x%llx" | |
186 | " length=0x%lx nr_pages=%u\n", | |
187 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
188 | pcol->nr_pages); | |
189 | ||
190 | __bio_for_each_segment(bvec, pcol->bio, i, 0) { | |
191 | struct page *page = bvec->bv_page; | |
192 | struct inode *inode = page->mapping->host; | |
193 | int page_stat; | |
194 | ||
195 | if (inode != pcol->inode) | |
196 | continue; /* osd might add more pages at end */ | |
197 | ||
198 | if (likely(length < good_bytes)) | |
199 | page_stat = 0; | |
200 | else | |
201 | page_stat = ret; | |
202 | ||
fe33cc1e | 203 | EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n", |
beaec07b BH |
204 | inode->i_ino, page->index, |
205 | page_stat ? "bad_bytes" : "good_bytes"); | |
206 | ||
207 | ret = update_read_page(page, page_stat); | |
208 | if (do_unlock) | |
209 | unlock_page(page); | |
210 | length += bvec->bv_len; | |
211 | } | |
212 | ||
213 | pcol_free(pcol); | |
214 | EXOFS_DBGMSG("readpages_done END\n"); | |
215 | return ret; | |
216 | } | |
217 | ||
218 | /* callback of async reads */ | |
219 | static void readpages_done(struct osd_request *or, void *p) | |
220 | { | |
221 | struct page_collect *pcol = p; | |
222 | ||
223 | __readpages_done(or, pcol, true); | |
224 | atomic_dec(&pcol->sbi->s_curr_pending); | |
225 | kfree(p); | |
226 | } | |
227 | ||
228 | static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) | |
229 | { | |
230 | struct bio_vec *bvec; | |
231 | int i; | |
232 | ||
233 | __bio_for_each_segment(bvec, pcol->bio, i, 0) { | |
234 | struct page *page = bvec->bv_page; | |
235 | ||
236 | if (rw == READ) | |
237 | update_read_page(page, ret); | |
238 | else | |
239 | update_write_page(page, ret); | |
240 | ||
241 | unlock_page(page); | |
242 | } | |
243 | pcol_free(pcol); | |
244 | } | |
245 | ||
246 | static int read_exec(struct page_collect *pcol, bool is_sync) | |
247 | { | |
248 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
249 | struct osd_obj_id obj = {pcol->sbi->s_pid, | |
250 | pcol->inode->i_ino + EXOFS_OBJ_OFF}; | |
251 | struct osd_request *or = NULL; | |
252 | struct page_collect *pcol_copy = NULL; | |
253 | loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT; | |
254 | int ret; | |
255 | ||
256 | if (!pcol->bio) | |
257 | return 0; | |
258 | ||
259 | /* see comment in _readpage() about sync reads */ | |
260 | WARN_ON(is_sync && (pcol->nr_pages != 1)); | |
261 | ||
262 | or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL); | |
263 | if (unlikely(!or)) { | |
264 | ret = -ENOMEM; | |
265 | goto err; | |
266 | } | |
267 | ||
62f469b5 | 268 | osd_req_read(or, &obj, i_start, pcol->bio, pcol->length); |
beaec07b BH |
269 | |
270 | if (is_sync) { | |
271 | exofs_sync_op(or, pcol->sbi->s_timeout, oi->i_cred); | |
272 | return __readpages_done(or, pcol, false); | |
273 | } | |
274 | ||
275 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); | |
276 | if (!pcol_copy) { | |
277 | ret = -ENOMEM; | |
278 | goto err; | |
279 | } | |
280 | ||
281 | *pcol_copy = *pcol; | |
282 | ret = exofs_async_op(or, readpages_done, pcol_copy, oi->i_cred); | |
283 | if (unlikely(ret)) | |
284 | goto err; | |
285 | ||
286 | atomic_inc(&pcol->sbi->s_curr_pending); | |
287 | ||
288 | EXOFS_DBGMSG("read_exec obj=0x%llx start=0x%llx length=0x%lx\n", | |
289 | obj.id, _LLU(i_start), pcol->length); | |
290 | ||
291 | /* pages ownership was passed to pcol_copy */ | |
292 | _pcol_reset(pcol); | |
293 | return 0; | |
294 | ||
295 | err: | |
296 | if (!is_sync) | |
297 | _unlock_pcol_pages(pcol, ret, READ); | |
b76a3f93 BH |
298 | else /* Pages unlocked by caller in sync mode only free bio */ |
299 | pcol_free(pcol); | |
300 | ||
beaec07b BH |
301 | kfree(pcol_copy); |
302 | if (or) | |
303 | osd_end_request(or); | |
304 | return ret; | |
305 | } | |
306 | ||
307 | /* readpage_strip is called either directly from readpage() or by the VFS from | |
308 | * within read_cache_pages(), to add one more page to be read. It will try to | |
309 | * collect as many contiguous pages as posible. If a discontinuity is | |
310 | * encountered, or it runs out of resources, it will submit the previous segment | |
311 | * and will start a new collection. Eventually caller must submit the last | |
312 | * segment if present. | |
313 | */ | |
314 | static int readpage_strip(void *data, struct page *page) | |
315 | { | |
316 | struct page_collect *pcol = data; | |
317 | struct inode *inode = pcol->inode; | |
318 | struct exofs_i_info *oi = exofs_i(inode); | |
319 | loff_t i_size = i_size_read(inode); | |
320 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
321 | size_t len; | |
322 | int ret; | |
323 | ||
324 | /* FIXME: Just for debugging, will be removed */ | |
325 | if (PageUptodate(page)) | |
326 | EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino, | |
327 | page->index); | |
328 | ||
329 | if (page->index < end_index) | |
330 | len = PAGE_CACHE_SIZE; | |
331 | else if (page->index == end_index) | |
332 | len = i_size & ~PAGE_CACHE_MASK; | |
333 | else | |
334 | len = 0; | |
335 | ||
336 | if (!len || !obj_created(oi)) { | |
337 | /* this will be out of bounds, or doesn't exist yet. | |
338 | * Current page is cleared and the request is split | |
339 | */ | |
340 | clear_highpage(page); | |
341 | ||
342 | SetPageUptodate(page); | |
343 | if (PageError(page)) | |
344 | ClearPageError(page); | |
345 | ||
346 | unlock_page(page); | |
347 | EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page," | |
348 | " splitting\n", inode->i_ino, page->index); | |
349 | ||
350 | return read_exec(pcol, false); | |
351 | } | |
352 | ||
353 | try_again: | |
354 | ||
355 | if (unlikely(pcol->pg_first == -1)) { | |
356 | pcol->pg_first = page->index; | |
357 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
358 | page->index)) { | |
359 | /* Discontinuity detected, split the request */ | |
360 | ret = read_exec(pcol, false); | |
361 | if (unlikely(ret)) | |
362 | goto fail; | |
363 | goto try_again; | |
364 | } | |
365 | ||
366 | if (!pcol->bio) { | |
367 | ret = pcol_try_alloc(pcol); | |
368 | if (unlikely(ret)) | |
369 | goto fail; | |
370 | } | |
371 | ||
372 | if (len != PAGE_CACHE_SIZE) | |
373 | zero_user(page, len, PAGE_CACHE_SIZE - len); | |
374 | ||
fe33cc1e | 375 | EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
376 | inode->i_ino, page->index, len); |
377 | ||
378 | ret = pcol_add_page(pcol, page, len); | |
379 | if (ret) { | |
fe33cc1e | 380 | EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p " |
beaec07b BH |
381 | "this_len=0x%zx nr_pages=%u length=0x%lx\n", |
382 | page, len, pcol->nr_pages, pcol->length); | |
383 | ||
384 | /* split the request, and start again with current page */ | |
385 | ret = read_exec(pcol, false); | |
386 | if (unlikely(ret)) | |
387 | goto fail; | |
388 | ||
389 | goto try_again; | |
390 | } | |
391 | ||
392 | return 0; | |
393 | ||
394 | fail: | |
395 | /* SetPageError(page); ??? */ | |
396 | unlock_page(page); | |
397 | return ret; | |
398 | } | |
399 | ||
400 | static int exofs_readpages(struct file *file, struct address_space *mapping, | |
401 | struct list_head *pages, unsigned nr_pages) | |
402 | { | |
403 | struct page_collect pcol; | |
404 | int ret; | |
405 | ||
406 | _pcol_init(&pcol, nr_pages, mapping->host); | |
407 | ||
408 | ret = read_cache_pages(mapping, pages, readpage_strip, &pcol); | |
409 | if (ret) { | |
410 | EXOFS_ERR("read_cache_pages => %d\n", ret); | |
411 | return ret; | |
412 | } | |
413 | ||
414 | return read_exec(&pcol, false); | |
415 | } | |
416 | ||
417 | static int _readpage(struct page *page, bool is_sync) | |
418 | { | |
419 | struct page_collect pcol; | |
420 | int ret; | |
421 | ||
422 | _pcol_init(&pcol, 1, page->mapping->host); | |
423 | ||
424 | /* readpage_strip might call read_exec(,async) inside at several places | |
425 | * but this is safe for is_async=0 since read_exec will not do anything | |
426 | * when we have a single page. | |
427 | */ | |
428 | ret = readpage_strip(&pcol, page); | |
429 | if (ret) { | |
430 | EXOFS_ERR("_readpage => %d\n", ret); | |
431 | return ret; | |
432 | } | |
433 | ||
434 | return read_exec(&pcol, is_sync); | |
435 | } | |
436 | ||
437 | /* | |
438 | * We don't need the file | |
439 | */ | |
440 | static int exofs_readpage(struct file *file, struct page *page) | |
441 | { | |
442 | return _readpage(page, false); | |
443 | } | |
444 | ||
445 | /* Callback for osd_write. All writes are asynchronouse */ | |
446 | static void writepages_done(struct osd_request *or, void *p) | |
447 | { | |
448 | struct page_collect *pcol = p; | |
449 | struct bio_vec *bvec; | |
450 | int i; | |
451 | u64 resid; | |
452 | u64 good_bytes; | |
453 | u64 length = 0; | |
454 | ||
455 | int ret = exofs_check_ok_resid(or, NULL, &resid); | |
456 | ||
457 | osd_end_request(or); | |
458 | atomic_dec(&pcol->sbi->s_curr_pending); | |
459 | ||
460 | if (likely(!ret)) | |
461 | good_bytes = pcol->length; | |
462 | else if (!resid) | |
463 | good_bytes = 0; | |
464 | else | |
465 | good_bytes = pcol->length - resid; | |
466 | ||
467 | EXOFS_DBGMSG("writepages_done(0x%lx) good_bytes=0x%llx" | |
468 | " length=0x%lx nr_pages=%u\n", | |
469 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
470 | pcol->nr_pages); | |
471 | ||
472 | __bio_for_each_segment(bvec, pcol->bio, i, 0) { | |
473 | struct page *page = bvec->bv_page; | |
474 | struct inode *inode = page->mapping->host; | |
475 | int page_stat; | |
476 | ||
477 | if (inode != pcol->inode) | |
478 | continue; /* osd might add more pages to a bio */ | |
479 | ||
480 | if (likely(length < good_bytes)) | |
481 | page_stat = 0; | |
482 | else | |
483 | page_stat = ret; | |
484 | ||
485 | update_write_page(page, page_stat); | |
486 | unlock_page(page); | |
fe33cc1e | 487 | EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n", |
beaec07b BH |
488 | inode->i_ino, page->index, page_stat); |
489 | ||
490 | length += bvec->bv_len; | |
491 | } | |
492 | ||
493 | pcol_free(pcol); | |
494 | kfree(pcol); | |
495 | EXOFS_DBGMSG("writepages_done END\n"); | |
496 | } | |
497 | ||
498 | static int write_exec(struct page_collect *pcol) | |
499 | { | |
500 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
501 | struct osd_obj_id obj = {pcol->sbi->s_pid, | |
502 | pcol->inode->i_ino + EXOFS_OBJ_OFF}; | |
503 | struct osd_request *or = NULL; | |
504 | struct page_collect *pcol_copy = NULL; | |
505 | loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT; | |
506 | int ret; | |
507 | ||
508 | if (!pcol->bio) | |
509 | return 0; | |
510 | ||
511 | or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL); | |
512 | if (unlikely(!or)) { | |
513 | EXOFS_ERR("write_exec: Faild to osd_start_request()\n"); | |
514 | ret = -ENOMEM; | |
515 | goto err; | |
516 | } | |
517 | ||
518 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); | |
519 | if (!pcol_copy) { | |
520 | EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n"); | |
521 | ret = -ENOMEM; | |
522 | goto err; | |
523 | } | |
524 | ||
525 | *pcol_copy = *pcol; | |
526 | ||
62f469b5 BH |
527 | pcol_copy->bio->bi_rw |= (1 << BIO_RW); /* FIXME: bio_set_dir() */ |
528 | osd_req_write(or, &obj, i_start, pcol_copy->bio, pcol_copy->length); | |
beaec07b BH |
529 | ret = exofs_async_op(or, writepages_done, pcol_copy, oi->i_cred); |
530 | if (unlikely(ret)) { | |
531 | EXOFS_ERR("write_exec: exofs_async_op() Faild\n"); | |
532 | goto err; | |
533 | } | |
534 | ||
535 | atomic_inc(&pcol->sbi->s_curr_pending); | |
536 | EXOFS_DBGMSG("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n", | |
537 | pcol->inode->i_ino, pcol->pg_first, _LLU(i_start), | |
538 | pcol->length); | |
539 | /* pages ownership was passed to pcol_copy */ | |
540 | _pcol_reset(pcol); | |
541 | return 0; | |
542 | ||
543 | err: | |
544 | _unlock_pcol_pages(pcol, ret, WRITE); | |
545 | kfree(pcol_copy); | |
546 | if (or) | |
547 | osd_end_request(or); | |
548 | return ret; | |
549 | } | |
550 | ||
551 | /* writepage_strip is called either directly from writepage() or by the VFS from | |
552 | * within write_cache_pages(), to add one more page to be written to storage. | |
553 | * It will try to collect as many contiguous pages as possible. If a | |
554 | * discontinuity is encountered or it runs out of resources it will submit the | |
555 | * previous segment and will start a new collection. | |
556 | * Eventually caller must submit the last segment if present. | |
557 | */ | |
558 | static int writepage_strip(struct page *page, | |
559 | struct writeback_control *wbc_unused, void *data) | |
560 | { | |
561 | struct page_collect *pcol = data; | |
562 | struct inode *inode = pcol->inode; | |
563 | struct exofs_i_info *oi = exofs_i(inode); | |
564 | loff_t i_size = i_size_read(inode); | |
565 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
566 | size_t len; | |
567 | int ret; | |
568 | ||
569 | BUG_ON(!PageLocked(page)); | |
570 | ||
571 | ret = wait_obj_created(oi); | |
572 | if (unlikely(ret)) | |
573 | goto fail; | |
574 | ||
575 | if (page->index < end_index) | |
576 | /* in this case, the page is within the limits of the file */ | |
577 | len = PAGE_CACHE_SIZE; | |
578 | else { | |
579 | len = i_size & ~PAGE_CACHE_MASK; | |
580 | ||
581 | if (page->index > end_index || !len) { | |
582 | /* in this case, the page is outside the limits | |
583 | * (truncate in progress) | |
584 | */ | |
585 | ret = write_exec(pcol); | |
586 | if (unlikely(ret)) | |
587 | goto fail; | |
588 | if (PageError(page)) | |
589 | ClearPageError(page); | |
590 | unlock_page(page); | |
591 | return 0; | |
592 | } | |
593 | } | |
594 | ||
595 | try_again: | |
596 | ||
597 | if (unlikely(pcol->pg_first == -1)) { | |
598 | pcol->pg_first = page->index; | |
599 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
600 | page->index)) { | |
601 | /* Discontinuity detected, split the request */ | |
602 | ret = write_exec(pcol); | |
603 | if (unlikely(ret)) | |
604 | goto fail; | |
605 | goto try_again; | |
606 | } | |
607 | ||
608 | if (!pcol->bio) { | |
609 | ret = pcol_try_alloc(pcol); | |
610 | if (unlikely(ret)) | |
611 | goto fail; | |
612 | } | |
613 | ||
fe33cc1e | 614 | EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
615 | inode->i_ino, page->index, len); |
616 | ||
617 | ret = pcol_add_page(pcol, page, len); | |
618 | if (unlikely(ret)) { | |
619 | EXOFS_DBGMSG("Failed pcol_add_page " | |
620 | "nr_pages=%u total_length=0x%lx\n", | |
621 | pcol->nr_pages, pcol->length); | |
622 | ||
623 | /* split the request, next loop will start again */ | |
624 | ret = write_exec(pcol); | |
625 | if (unlikely(ret)) { | |
626 | EXOFS_DBGMSG("write_exec faild => %d", ret); | |
627 | goto fail; | |
628 | } | |
629 | ||
630 | goto try_again; | |
631 | } | |
632 | ||
633 | BUG_ON(PageWriteback(page)); | |
634 | set_page_writeback(page); | |
635 | ||
636 | return 0; | |
637 | ||
638 | fail: | |
639 | set_bit(AS_EIO, &page->mapping->flags); | |
640 | unlock_page(page); | |
641 | return ret; | |
642 | } | |
643 | ||
644 | static int exofs_writepages(struct address_space *mapping, | |
645 | struct writeback_control *wbc) | |
646 | { | |
647 | struct page_collect pcol; | |
648 | long start, end, expected_pages; | |
649 | int ret; | |
650 | ||
651 | start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
652 | end = (wbc->range_end == LLONG_MAX) ? | |
653 | start + mapping->nrpages : | |
654 | wbc->range_end >> PAGE_CACHE_SHIFT; | |
655 | ||
656 | if (start || end) | |
657 | expected_pages = min(end - start + 1, 32L); | |
658 | else | |
659 | expected_pages = mapping->nrpages; | |
660 | ||
661 | EXOFS_DBGMSG("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx" | |
662 | " m->nrpages=%lu start=0x%lx end=0x%lx\n", | |
663 | mapping->host->i_ino, wbc->range_start, wbc->range_end, | |
664 | mapping->nrpages, start, end); | |
665 | ||
666 | _pcol_init(&pcol, expected_pages, mapping->host); | |
667 | ||
668 | ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); | |
669 | if (ret) { | |
670 | EXOFS_ERR("write_cache_pages => %d\n", ret); | |
671 | return ret; | |
672 | } | |
673 | ||
674 | return write_exec(&pcol); | |
675 | } | |
676 | ||
677 | static int exofs_writepage(struct page *page, struct writeback_control *wbc) | |
678 | { | |
679 | struct page_collect pcol; | |
680 | int ret; | |
681 | ||
682 | _pcol_init(&pcol, 1, page->mapping->host); | |
683 | ||
684 | ret = writepage_strip(page, NULL, &pcol); | |
685 | if (ret) { | |
686 | EXOFS_ERR("exofs_writepage => %d\n", ret); | |
687 | return ret; | |
688 | } | |
689 | ||
690 | return write_exec(&pcol); | |
691 | } | |
692 | ||
693 | int exofs_write_begin(struct file *file, struct address_space *mapping, | |
694 | loff_t pos, unsigned len, unsigned flags, | |
695 | struct page **pagep, void **fsdata) | |
696 | { | |
697 | int ret = 0; | |
698 | struct page *page; | |
699 | ||
700 | page = *pagep; | |
701 | if (page == NULL) { | |
702 | ret = simple_write_begin(file, mapping, pos, len, flags, pagep, | |
703 | fsdata); | |
704 | if (ret) { | |
705 | EXOFS_DBGMSG("simple_write_begin faild\n"); | |
706 | return ret; | |
707 | } | |
708 | ||
709 | page = *pagep; | |
710 | } | |
711 | ||
712 | /* read modify write */ | |
713 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { | |
714 | ret = _readpage(page, true); | |
715 | if (ret) { | |
716 | /*SetPageError was done by _readpage. Is it ok?*/ | |
717 | unlock_page(page); | |
718 | EXOFS_DBGMSG("__readpage_filler faild\n"); | |
719 | } | |
720 | } | |
721 | ||
722 | return ret; | |
723 | } | |
724 | ||
725 | static int exofs_write_begin_export(struct file *file, | |
726 | struct address_space *mapping, | |
727 | loff_t pos, unsigned len, unsigned flags, | |
728 | struct page **pagep, void **fsdata) | |
729 | { | |
730 | *pagep = NULL; | |
731 | ||
732 | return exofs_write_begin(file, mapping, pos, len, flags, pagep, | |
733 | fsdata); | |
734 | } | |
735 | ||
736 | const struct address_space_operations exofs_aops = { | |
737 | .readpage = exofs_readpage, | |
738 | .readpages = exofs_readpages, | |
739 | .writepage = exofs_writepage, | |
740 | .writepages = exofs_writepages, | |
741 | .write_begin = exofs_write_begin_export, | |
742 | .write_end = simple_write_end, | |
743 | }; | |
744 | ||
e8062719 BH |
745 | /****************************************************************************** |
746 | * INODE OPERATIONS | |
747 | *****************************************************************************/ | |
748 | ||
749 | /* | |
750 | * Test whether an inode is a fast symlink. | |
751 | */ | |
752 | static inline int exofs_inode_is_fast_symlink(struct inode *inode) | |
753 | { | |
754 | struct exofs_i_info *oi = exofs_i(inode); | |
755 | ||
756 | return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); | |
757 | } | |
758 | ||
759 | /* | |
760 | * get_block_t - Fill in a buffer_head | |
761 | * An OSD takes care of block allocation so we just fake an allocation by | |
762 | * putting in the inode's sector_t in the buffer_head. | |
763 | * TODO: What about the case of create==0 and @iblock does not exist in the | |
764 | * object? | |
765 | */ | |
766 | static int exofs_get_block(struct inode *inode, sector_t iblock, | |
767 | struct buffer_head *bh_result, int create) | |
768 | { | |
769 | map_bh(bh_result, inode->i_sb, iblock); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | const struct osd_attr g_attr_logical_length = ATTR_DEF( | |
774 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); | |
775 | ||
776 | /* | |
777 | * Truncate a file to the specified size - all we have to do is set the size | |
778 | * attribute. We make sure the object exists first. | |
779 | */ | |
780 | void exofs_truncate(struct inode *inode) | |
781 | { | |
782 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
783 | struct exofs_i_info *oi = exofs_i(inode); | |
784 | struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF}; | |
785 | struct osd_request *or; | |
786 | struct osd_attr attr; | |
787 | loff_t isize = i_size_read(inode); | |
788 | __be64 newsize; | |
789 | int ret; | |
790 | ||
791 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) | |
792 | || S_ISLNK(inode->i_mode))) | |
793 | return; | |
794 | if (exofs_inode_is_fast_symlink(inode)) | |
795 | return; | |
796 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
797 | return; | |
798 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
799 | ||
800 | nobh_truncate_page(inode->i_mapping, isize, exofs_get_block); | |
801 | ||
802 | or = osd_start_request(sbi->s_dev, GFP_KERNEL); | |
803 | if (unlikely(!or)) { | |
804 | EXOFS_ERR("ERROR: exofs_truncate: osd_start_request failed\n"); | |
805 | goto fail; | |
806 | } | |
807 | ||
808 | osd_req_set_attributes(or, &obj); | |
809 | ||
810 | newsize = cpu_to_be64((u64)isize); | |
811 | attr = g_attr_logical_length; | |
812 | attr.val_ptr = &newsize; | |
813 | osd_req_add_set_attr_list(or, &attr, 1); | |
814 | ||
815 | /* if we are about to truncate an object, and it hasn't been | |
816 | * created yet, wait | |
817 | */ | |
818 | if (unlikely(wait_obj_created(oi))) | |
819 | goto fail; | |
820 | ||
821 | ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred); | |
822 | osd_end_request(or); | |
823 | if (ret) | |
824 | goto fail; | |
825 | ||
826 | out: | |
827 | mark_inode_dirty(inode); | |
828 | return; | |
829 | fail: | |
830 | make_bad_inode(inode); | |
831 | goto out; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Set inode attributes - just call generic functions. | |
836 | */ | |
837 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) | |
838 | { | |
839 | struct inode *inode = dentry->d_inode; | |
840 | int error; | |
841 | ||
842 | error = inode_change_ok(inode, iattr); | |
843 | if (error) | |
844 | return error; | |
845 | ||
846 | error = inode_setattr(inode, iattr); | |
847 | return error; | |
848 | } | |
e6af00f1 BH |
849 | |
850 | /* | |
851 | * Read an inode from the OSD, and return it as is. We also return the size | |
852 | * attribute in the 'sanity' argument if we got compiled with debugging turned | |
853 | * on. | |
854 | */ | |
855 | static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, | |
856 | struct exofs_fcb *inode, uint64_t *sanity) | |
857 | { | |
858 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
859 | struct osd_request *or; | |
860 | struct osd_attr attr; | |
861 | struct osd_obj_id obj = {sbi->s_pid, | |
862 | oi->vfs_inode.i_ino + EXOFS_OBJ_OFF}; | |
863 | int ret; | |
864 | ||
865 | exofs_make_credential(oi->i_cred, &obj); | |
866 | ||
867 | or = osd_start_request(sbi->s_dev, GFP_KERNEL); | |
868 | if (unlikely(!or)) { | |
869 | EXOFS_ERR("exofs_get_inode: osd_start_request failed.\n"); | |
870 | return -ENOMEM; | |
871 | } | |
872 | osd_req_get_attributes(or, &obj); | |
873 | ||
874 | /* we need the inode attribute */ | |
875 | osd_req_add_get_attr_list(or, &g_attr_inode_data, 1); | |
876 | ||
877 | #ifdef EXOFS_DEBUG_OBJ_ISIZE | |
878 | /* we get the size attributes to do a sanity check */ | |
879 | osd_req_add_get_attr_list(or, &g_attr_logical_length, 1); | |
880 | #endif | |
881 | ||
882 | ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred); | |
883 | if (ret) | |
884 | goto out; | |
885 | ||
886 | attr = g_attr_inode_data; | |
887 | ret = extract_attr_from_req(or, &attr); | |
888 | if (ret) { | |
889 | EXOFS_ERR("exofs_get_inode: extract_attr_from_req failed\n"); | |
890 | goto out; | |
891 | } | |
892 | ||
893 | WARN_ON(attr.len != EXOFS_INO_ATTR_SIZE); | |
894 | memcpy(inode, attr.val_ptr, EXOFS_INO_ATTR_SIZE); | |
895 | ||
896 | #ifdef EXOFS_DEBUG_OBJ_ISIZE | |
897 | attr = g_attr_logical_length; | |
898 | ret = extract_attr_from_req(or, &attr); | |
899 | if (ret) { | |
900 | EXOFS_ERR("ERROR: extract attr from or failed\n"); | |
901 | goto out; | |
902 | } | |
903 | *sanity = get_unaligned_be64(attr.val_ptr); | |
904 | #endif | |
905 | ||
906 | out: | |
907 | osd_end_request(or); | |
908 | return ret; | |
909 | } | |
910 | ||
911 | /* | |
912 | * Fill in an inode read from the OSD and set it up for use | |
913 | */ | |
914 | struct inode *exofs_iget(struct super_block *sb, unsigned long ino) | |
915 | { | |
916 | struct exofs_i_info *oi; | |
917 | struct exofs_fcb fcb; | |
918 | struct inode *inode; | |
919 | uint64_t uninitialized_var(sanity); | |
920 | int ret; | |
921 | ||
922 | inode = iget_locked(sb, ino); | |
923 | if (!inode) | |
924 | return ERR_PTR(-ENOMEM); | |
925 | if (!(inode->i_state & I_NEW)) | |
926 | return inode; | |
927 | oi = exofs_i(inode); | |
928 | ||
929 | /* read the inode from the osd */ | |
930 | ret = exofs_get_inode(sb, oi, &fcb, &sanity); | |
931 | if (ret) | |
932 | goto bad_inode; | |
933 | ||
934 | init_waitqueue_head(&oi->i_wq); | |
935 | set_obj_created(oi); | |
936 | ||
937 | /* copy stuff from on-disk struct to in-memory struct */ | |
938 | inode->i_mode = le16_to_cpu(fcb.i_mode); | |
939 | inode->i_uid = le32_to_cpu(fcb.i_uid); | |
940 | inode->i_gid = le32_to_cpu(fcb.i_gid); | |
941 | inode->i_nlink = le16_to_cpu(fcb.i_links_count); | |
942 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime); | |
943 | inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime); | |
944 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime); | |
945 | inode->i_ctime.tv_nsec = | |
946 | inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0; | |
947 | oi->i_commit_size = le64_to_cpu(fcb.i_size); | |
948 | i_size_write(inode, oi->i_commit_size); | |
949 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
950 | inode->i_generation = le32_to_cpu(fcb.i_generation); | |
951 | ||
952 | #ifdef EXOFS_DEBUG_OBJ_ISIZE | |
953 | if ((inode->i_size != sanity) && | |
954 | (!exofs_inode_is_fast_symlink(inode))) { | |
58311c43 | 955 | EXOFS_ERR("WARNING: Size of inode=%llu != object=%llu\n", |
e6af00f1 BH |
956 | inode->i_size, _LLU(sanity)); |
957 | } | |
958 | #endif | |
959 | ||
960 | oi->i_dir_start_lookup = 0; | |
961 | ||
962 | if ((inode->i_nlink == 0) && (inode->i_mode == 0)) { | |
963 | ret = -ESTALE; | |
964 | goto bad_inode; | |
965 | } | |
966 | ||
967 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
968 | if (fcb.i_data[0]) | |
969 | inode->i_rdev = | |
970 | old_decode_dev(le32_to_cpu(fcb.i_data[0])); | |
971 | else | |
972 | inode->i_rdev = | |
973 | new_decode_dev(le32_to_cpu(fcb.i_data[1])); | |
974 | } else { | |
975 | memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); | |
976 | } | |
977 | ||
978 | if (S_ISREG(inode->i_mode)) { | |
979 | inode->i_op = &exofs_file_inode_operations; | |
980 | inode->i_fop = &exofs_file_operations; | |
981 | inode->i_mapping->a_ops = &exofs_aops; | |
982 | } else if (S_ISDIR(inode->i_mode)) { | |
983 | inode->i_op = &exofs_dir_inode_operations; | |
984 | inode->i_fop = &exofs_dir_operations; | |
985 | inode->i_mapping->a_ops = &exofs_aops; | |
986 | } else if (S_ISLNK(inode->i_mode)) { | |
987 | if (exofs_inode_is_fast_symlink(inode)) | |
988 | inode->i_op = &exofs_fast_symlink_inode_operations; | |
989 | else { | |
990 | inode->i_op = &exofs_symlink_inode_operations; | |
991 | inode->i_mapping->a_ops = &exofs_aops; | |
992 | } | |
993 | } else { | |
994 | inode->i_op = &exofs_special_inode_operations; | |
995 | if (fcb.i_data[0]) | |
996 | init_special_inode(inode, inode->i_mode, | |
997 | old_decode_dev(le32_to_cpu(fcb.i_data[0]))); | |
998 | else | |
999 | init_special_inode(inode, inode->i_mode, | |
1000 | new_decode_dev(le32_to_cpu(fcb.i_data[1]))); | |
1001 | } | |
1002 | ||
1003 | unlock_new_inode(inode); | |
1004 | return inode; | |
1005 | ||
1006 | bad_inode: | |
1007 | iget_failed(inode); | |
1008 | return ERR_PTR(ret); | |
1009 | } | |
1010 | ||
1011 | int __exofs_wait_obj_created(struct exofs_i_info *oi) | |
1012 | { | |
1013 | if (!obj_created(oi)) { | |
1014 | BUG_ON(!obj_2bcreated(oi)); | |
1015 | wait_event(oi->i_wq, obj_created(oi)); | |
1016 | } | |
1017 | return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; | |
1018 | } | |
1019 | /* | |
1020 | * Callback function from exofs_new_inode(). The important thing is that we | |
1021 | * set the obj_created flag so that other methods know that the object exists on | |
1022 | * the OSD. | |
1023 | */ | |
1024 | static void create_done(struct osd_request *or, void *p) | |
1025 | { | |
1026 | struct inode *inode = p; | |
1027 | struct exofs_i_info *oi = exofs_i(inode); | |
1028 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
1029 | int ret; | |
1030 | ||
1031 | ret = exofs_check_ok(or); | |
1032 | osd_end_request(or); | |
1033 | atomic_dec(&sbi->s_curr_pending); | |
1034 | ||
1035 | if (unlikely(ret)) { | |
1036 | EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx", | |
1037 | _LLU(sbi->s_pid), _LLU(inode->i_ino + EXOFS_OBJ_OFF)); | |
1038 | make_bad_inode(inode); | |
1039 | } else | |
1040 | set_obj_created(oi); | |
1041 | ||
1042 | atomic_dec(&inode->i_count); | |
1043 | wake_up(&oi->i_wq); | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Set up a new inode and create an object for it on the OSD | |
1048 | */ | |
1049 | struct inode *exofs_new_inode(struct inode *dir, int mode) | |
1050 | { | |
1051 | struct super_block *sb; | |
1052 | struct inode *inode; | |
1053 | struct exofs_i_info *oi; | |
1054 | struct exofs_sb_info *sbi; | |
1055 | struct osd_request *or; | |
1056 | struct osd_obj_id obj; | |
1057 | int ret; | |
1058 | ||
1059 | sb = dir->i_sb; | |
1060 | inode = new_inode(sb); | |
1061 | if (!inode) | |
1062 | return ERR_PTR(-ENOMEM); | |
1063 | ||
1064 | oi = exofs_i(inode); | |
1065 | ||
1066 | init_waitqueue_head(&oi->i_wq); | |
1067 | set_obj_2bcreated(oi); | |
1068 | ||
1069 | sbi = sb->s_fs_info; | |
1070 | ||
1071 | sb->s_dirt = 1; | |
1072 | inode->i_uid = current->cred->fsuid; | |
1073 | if (dir->i_mode & S_ISGID) { | |
1074 | inode->i_gid = dir->i_gid; | |
1075 | if (S_ISDIR(mode)) | |
1076 | mode |= S_ISGID; | |
1077 | } else { | |
1078 | inode->i_gid = current->cred->fsgid; | |
1079 | } | |
1080 | inode->i_mode = mode; | |
1081 | ||
1082 | inode->i_ino = sbi->s_nextid++; | |
1083 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1084 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1085 | oi->i_commit_size = inode->i_size = 0; | |
1086 | spin_lock(&sbi->s_next_gen_lock); | |
1087 | inode->i_generation = sbi->s_next_generation++; | |
1088 | spin_unlock(&sbi->s_next_gen_lock); | |
1089 | insert_inode_hash(inode); | |
1090 | ||
1091 | mark_inode_dirty(inode); | |
1092 | ||
1093 | obj.partition = sbi->s_pid; | |
1094 | obj.id = inode->i_ino + EXOFS_OBJ_OFF; | |
1095 | exofs_make_credential(oi->i_cred, &obj); | |
1096 | ||
1097 | or = osd_start_request(sbi->s_dev, GFP_KERNEL); | |
1098 | if (unlikely(!or)) { | |
1099 | EXOFS_ERR("exofs_new_inode: osd_start_request failed\n"); | |
1100 | return ERR_PTR(-ENOMEM); | |
1101 | } | |
1102 | ||
1103 | osd_req_create_object(or, &obj); | |
1104 | ||
1105 | /* increment the refcount so that the inode will still be around when we | |
1106 | * reach the callback | |
1107 | */ | |
1108 | atomic_inc(&inode->i_count); | |
1109 | ||
1110 | ret = exofs_async_op(or, create_done, inode, oi->i_cred); | |
1111 | if (ret) { | |
1112 | atomic_dec(&inode->i_count); | |
1113 | osd_end_request(or); | |
1114 | return ERR_PTR(-EIO); | |
1115 | } | |
1116 | atomic_inc(&sbi->s_curr_pending); | |
1117 | ||
1118 | return inode; | |
1119 | } | |
ba9e5e98 BH |
1120 | |
1121 | /* | |
1122 | * struct to pass two arguments to update_inode's callback | |
1123 | */ | |
1124 | struct updatei_args { | |
1125 | struct exofs_sb_info *sbi; | |
1126 | struct exofs_fcb fcb; | |
1127 | }; | |
1128 | ||
1129 | /* | |
1130 | * Callback function from exofs_update_inode(). | |
1131 | */ | |
1132 | static void updatei_done(struct osd_request *or, void *p) | |
1133 | { | |
1134 | struct updatei_args *args = p; | |
1135 | ||
1136 | osd_end_request(or); | |
1137 | ||
1138 | atomic_dec(&args->sbi->s_curr_pending); | |
1139 | ||
1140 | kfree(args); | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Write the inode to the OSD. Just fill up the struct, and set the attribute | |
1145 | * synchronously or asynchronously depending on the do_sync flag. | |
1146 | */ | |
1147 | static int exofs_update_inode(struct inode *inode, int do_sync) | |
1148 | { | |
1149 | struct exofs_i_info *oi = exofs_i(inode); | |
1150 | struct super_block *sb = inode->i_sb; | |
1151 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
1152 | struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF}; | |
1153 | struct osd_request *or; | |
1154 | struct osd_attr attr; | |
1155 | struct exofs_fcb *fcb; | |
1156 | struct updatei_args *args; | |
1157 | int ret; | |
1158 | ||
1159 | args = kzalloc(sizeof(*args), GFP_KERNEL); | |
1160 | if (!args) | |
1161 | return -ENOMEM; | |
1162 | ||
1163 | fcb = &args->fcb; | |
1164 | ||
1165 | fcb->i_mode = cpu_to_le16(inode->i_mode); | |
1166 | fcb->i_uid = cpu_to_le32(inode->i_uid); | |
1167 | fcb->i_gid = cpu_to_le32(inode->i_gid); | |
1168 | fcb->i_links_count = cpu_to_le16(inode->i_nlink); | |
1169 | fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); | |
1170 | fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec); | |
1171 | fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); | |
1172 | oi->i_commit_size = i_size_read(inode); | |
1173 | fcb->i_size = cpu_to_le64(oi->i_commit_size); | |
1174 | fcb->i_generation = cpu_to_le32(inode->i_generation); | |
1175 | ||
1176 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1177 | if (old_valid_dev(inode->i_rdev)) { | |
1178 | fcb->i_data[0] = | |
1179 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
1180 | fcb->i_data[1] = 0; | |
1181 | } else { | |
1182 | fcb->i_data[0] = 0; | |
1183 | fcb->i_data[1] = | |
1184 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
1185 | fcb->i_data[2] = 0; | |
1186 | } | |
1187 | } else | |
1188 | memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data)); | |
1189 | ||
1190 | or = osd_start_request(sbi->s_dev, GFP_KERNEL); | |
1191 | if (unlikely(!or)) { | |
1192 | EXOFS_ERR("exofs_update_inode: osd_start_request failed.\n"); | |
1193 | ret = -ENOMEM; | |
1194 | goto free_args; | |
1195 | } | |
1196 | ||
1197 | osd_req_set_attributes(or, &obj); | |
1198 | ||
1199 | attr = g_attr_inode_data; | |
1200 | attr.val_ptr = fcb; | |
1201 | osd_req_add_set_attr_list(or, &attr, 1); | |
1202 | ||
1203 | if (!obj_created(oi)) { | |
1204 | EXOFS_DBGMSG("!obj_created\n"); | |
1205 | BUG_ON(!obj_2bcreated(oi)); | |
1206 | wait_event(oi->i_wq, obj_created(oi)); | |
1207 | EXOFS_DBGMSG("wait_event done\n"); | |
1208 | } | |
1209 | ||
1210 | if (do_sync) { | |
1211 | ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred); | |
1212 | osd_end_request(or); | |
1213 | goto free_args; | |
1214 | } else { | |
1215 | args->sbi = sbi; | |
1216 | ||
1217 | ret = exofs_async_op(or, updatei_done, args, oi->i_cred); | |
1218 | if (ret) { | |
1219 | osd_end_request(or); | |
1220 | goto free_args; | |
1221 | } | |
1222 | atomic_inc(&sbi->s_curr_pending); | |
1223 | goto out; /* deallocation in updatei_done */ | |
1224 | } | |
1225 | ||
1226 | free_args: | |
1227 | kfree(args); | |
1228 | out: | |
1229 | EXOFS_DBGMSG("ret=>%d\n", ret); | |
1230 | return ret; | |
1231 | } | |
1232 | ||
1233 | int exofs_write_inode(struct inode *inode, int wait) | |
1234 | { | |
1235 | return exofs_update_inode(inode, wait); | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Callback function from exofs_delete_inode() - don't have much cleaning up to | |
1240 | * do. | |
1241 | */ | |
1242 | static void delete_done(struct osd_request *or, void *p) | |
1243 | { | |
1244 | struct exofs_sb_info *sbi; | |
1245 | osd_end_request(or); | |
1246 | sbi = p; | |
1247 | atomic_dec(&sbi->s_curr_pending); | |
1248 | } | |
1249 | ||
1250 | /* | |
1251 | * Called when the refcount of an inode reaches zero. We remove the object | |
1252 | * from the OSD here. We make sure the object was created before we try and | |
1253 | * delete it. | |
1254 | */ | |
1255 | void exofs_delete_inode(struct inode *inode) | |
1256 | { | |
1257 | struct exofs_i_info *oi = exofs_i(inode); | |
1258 | struct super_block *sb = inode->i_sb; | |
1259 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
1260 | struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF}; | |
1261 | struct osd_request *or; | |
1262 | int ret; | |
1263 | ||
1264 | truncate_inode_pages(&inode->i_data, 0); | |
1265 | ||
1266 | if (is_bad_inode(inode)) | |
1267 | goto no_delete; | |
1268 | ||
1269 | mark_inode_dirty(inode); | |
1270 | exofs_update_inode(inode, inode_needs_sync(inode)); | |
1271 | ||
1272 | inode->i_size = 0; | |
1273 | if (inode->i_blocks) | |
1274 | exofs_truncate(inode); | |
1275 | ||
1276 | clear_inode(inode); | |
1277 | ||
1278 | or = osd_start_request(sbi->s_dev, GFP_KERNEL); | |
1279 | if (unlikely(!or)) { | |
1280 | EXOFS_ERR("exofs_delete_inode: osd_start_request failed\n"); | |
1281 | return; | |
1282 | } | |
1283 | ||
1284 | osd_req_remove_object(or, &obj); | |
1285 | ||
1286 | /* if we are deleting an obj that hasn't been created yet, wait */ | |
1287 | if (!obj_created(oi)) { | |
1288 | BUG_ON(!obj_2bcreated(oi)); | |
1289 | wait_event(oi->i_wq, obj_created(oi)); | |
1290 | } | |
1291 | ||
1292 | ret = exofs_async_op(or, delete_done, sbi, oi->i_cred); | |
1293 | if (ret) { | |
1294 | EXOFS_ERR( | |
1295 | "ERROR: @exofs_delete_inode exofs_async_op failed\n"); | |
1296 | osd_end_request(or); | |
1297 | return; | |
1298 | } | |
1299 | atomic_inc(&sbi->s_curr_pending); | |
1300 | ||
1301 | return; | |
1302 | ||
1303 | no_delete: | |
1304 | clear_inode(inode); | |
1305 | } |