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e8062719 BH |
1 | /* |
2 | * Copyright (C) 2005, 2006 | |
3 | * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com) | |
4 | * Copyright (C) 2005, 2006 | |
5 | * International Business Machines | |
6 | * Copyright (C) 2008, 2009 | |
7 | * Boaz Harrosh <bharrosh@panasas.com> | |
8 | * | |
9 | * Copyrights for code taken from ext2: | |
10 | * Copyright (C) 1992, 1993, 1994, 1995 | |
11 | * Remy Card (card@masi.ibp.fr) | |
12 | * Laboratoire MASI - Institut Blaise Pascal | |
13 | * Universite Pierre et Marie Curie (Paris VI) | |
14 | * from | |
15 | * linux/fs/minix/inode.c | |
16 | * Copyright (C) 1991, 1992 Linus Torvalds | |
17 | * | |
18 | * This file is part of exofs. | |
19 | * | |
20 | * exofs is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation. Since it is based on ext2, and the only | |
23 | * valid version of GPL for the Linux kernel is version 2, the only valid | |
24 | * version of GPL for exofs is version 2. | |
25 | * | |
26 | * exofs is distributed in the hope that it will be useful, | |
27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29 | * GNU General Public License for more details. | |
30 | * | |
31 | * You should have received a copy of the GNU General Public License | |
32 | * along with exofs; if not, write to the Free Software | |
33 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
34 | */ | |
35 | ||
36 | #include <linux/writeback.h> | |
37 | #include <linux/buffer_head.h> | |
beaec07b | 38 | #include <scsi/scsi_device.h> |
e8062719 BH |
39 | |
40 | #include "exofs.h" | |
41 | ||
42 | #ifdef CONFIG_EXOFS_DEBUG | |
43 | # define EXOFS_DEBUG_OBJ_ISIZE 1 | |
44 | #endif | |
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; | |
62 | struct request_queue *req_q = sbi->s_dev->scsi_device->request_queue; | |
63 | ||
64 | pcol->sbi = sbi; | |
65 | pcol->req_q = req_q; | |
66 | pcol->inode = inode; | |
67 | pcol->expected_pages = expected_pages; | |
68 | ||
69 | pcol->bio = NULL; | |
70 | pcol->nr_pages = 0; | |
71 | pcol->length = 0; | |
72 | pcol->pg_first = -1; | |
73 | ||
74 | EXOFS_DBGMSG("_pcol_init ino=0x%lx expected_pages=%u\n", inode->i_ino, | |
75 | expected_pages); | |
76 | } | |
77 | ||
78 | static void _pcol_reset(struct page_collect *pcol) | |
79 | { | |
80 | pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages); | |
81 | ||
82 | pcol->bio = NULL; | |
83 | pcol->nr_pages = 0; | |
84 | pcol->length = 0; | |
85 | pcol->pg_first = -1; | |
86 | EXOFS_DBGMSG("_pcol_reset ino=0x%lx expected_pages=%u\n", | |
87 | pcol->inode->i_ino, pcol->expected_pages); | |
88 | ||
89 | /* this is probably the end of the loop but in writes | |
90 | * it might not end here. don't be left with nothing | |
91 | */ | |
92 | if (!pcol->expected_pages) | |
93 | pcol->expected_pages = 128; | |
94 | } | |
95 | ||
96 | static int pcol_try_alloc(struct page_collect *pcol) | |
97 | { | |
98 | int pages = min_t(unsigned, pcol->expected_pages, BIO_MAX_PAGES); | |
99 | ||
100 | for (; pages; pages >>= 1) { | |
101 | pcol->bio = bio_alloc(GFP_KERNEL, pages); | |
102 | if (likely(pcol->bio)) | |
103 | return 0; | |
104 | } | |
105 | ||
106 | EXOFS_ERR("Failed to kcalloc expected_pages=%u\n", | |
107 | pcol->expected_pages); | |
108 | return -ENOMEM; | |
109 | } | |
110 | ||
111 | static void pcol_free(struct page_collect *pcol) | |
112 | { | |
113 | bio_put(pcol->bio); | |
114 | pcol->bio = NULL; | |
115 | } | |
116 | ||
117 | static int pcol_add_page(struct page_collect *pcol, struct page *page, | |
118 | unsigned len) | |
119 | { | |
120 | int added_len = bio_add_pc_page(pcol->req_q, pcol->bio, page, len, 0); | |
121 | if (unlikely(len != added_len)) | |
122 | return -ENOMEM; | |
123 | ||
124 | ++pcol->nr_pages; | |
125 | pcol->length += len; | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static int update_read_page(struct page *page, int ret) | |
130 | { | |
131 | if (ret == 0) { | |
132 | /* Everything is OK */ | |
133 | SetPageUptodate(page); | |
134 | if (PageError(page)) | |
135 | ClearPageError(page); | |
136 | } else if (ret == -EFAULT) { | |
137 | /* In this case we were trying to read something that wasn't on | |
138 | * disk yet - return a page full of zeroes. This should be OK, | |
139 | * because the object should be empty (if there was a write | |
140 | * before this read, the read would be waiting with the page | |
141 | * locked */ | |
142 | clear_highpage(page); | |
143 | ||
144 | SetPageUptodate(page); | |
145 | if (PageError(page)) | |
146 | ClearPageError(page); | |
147 | ret = 0; /* recovered error */ | |
148 | EXOFS_DBGMSG("recovered read error\n"); | |
149 | } else /* Error */ | |
150 | SetPageError(page); | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
155 | static void update_write_page(struct page *page, int ret) | |
156 | { | |
157 | if (ret) { | |
158 | mapping_set_error(page->mapping, ret); | |
159 | SetPageError(page); | |
160 | } | |
161 | end_page_writeback(page); | |
162 | } | |
163 | ||
164 | /* Called at the end of reads, to optionally unlock pages and update their | |
165 | * status. | |
166 | */ | |
167 | static int __readpages_done(struct osd_request *or, struct page_collect *pcol, | |
168 | bool do_unlock) | |
169 | { | |
170 | struct bio_vec *bvec; | |
171 | int i; | |
172 | u64 resid; | |
173 | u64 good_bytes; | |
174 | u64 length = 0; | |
175 | int ret = exofs_check_ok_resid(or, &resid, NULL); | |
176 | ||
177 | osd_end_request(or); | |
178 | ||
179 | if (likely(!ret)) | |
180 | good_bytes = pcol->length; | |
181 | else if (!resid) | |
182 | good_bytes = 0; | |
183 | else | |
184 | good_bytes = pcol->length - resid; | |
185 | ||
186 | EXOFS_DBGMSG("readpages_done(0x%lx) good_bytes=0x%llx" | |
187 | " length=0x%lx nr_pages=%u\n", | |
188 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
189 | pcol->nr_pages); | |
190 | ||
191 | __bio_for_each_segment(bvec, pcol->bio, i, 0) { | |
192 | struct page *page = bvec->bv_page; | |
193 | struct inode *inode = page->mapping->host; | |
194 | int page_stat; | |
195 | ||
196 | if (inode != pcol->inode) | |
197 | continue; /* osd might add more pages at end */ | |
198 | ||
199 | if (likely(length < good_bytes)) | |
200 | page_stat = 0; | |
201 | else | |
202 | page_stat = ret; | |
203 | ||
204 | EXOFS_DBGMSG(" readpages_done(0x%lx, 0x%lx) %s\n", | |
205 | inode->i_ino, page->index, | |
206 | page_stat ? "bad_bytes" : "good_bytes"); | |
207 | ||
208 | ret = update_read_page(page, page_stat); | |
209 | if (do_unlock) | |
210 | unlock_page(page); | |
211 | length += bvec->bv_len; | |
212 | } | |
213 | ||
214 | pcol_free(pcol); | |
215 | EXOFS_DBGMSG("readpages_done END\n"); | |
216 | return ret; | |
217 | } | |
218 | ||
219 | /* callback of async reads */ | |
220 | static void readpages_done(struct osd_request *or, void *p) | |
221 | { | |
222 | struct page_collect *pcol = p; | |
223 | ||
224 | __readpages_done(or, pcol, true); | |
225 | atomic_dec(&pcol->sbi->s_curr_pending); | |
226 | kfree(p); | |
227 | } | |
228 | ||
229 | static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) | |
230 | { | |
231 | struct bio_vec *bvec; | |
232 | int i; | |
233 | ||
234 | __bio_for_each_segment(bvec, pcol->bio, i, 0) { | |
235 | struct page *page = bvec->bv_page; | |
236 | ||
237 | if (rw == READ) | |
238 | update_read_page(page, ret); | |
239 | else | |
240 | update_write_page(page, ret); | |
241 | ||
242 | unlock_page(page); | |
243 | } | |
244 | pcol_free(pcol); | |
245 | } | |
246 | ||
247 | static int read_exec(struct page_collect *pcol, bool is_sync) | |
248 | { | |
249 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
250 | struct osd_obj_id obj = {pcol->sbi->s_pid, | |
251 | pcol->inode->i_ino + EXOFS_OBJ_OFF}; | |
252 | struct osd_request *or = NULL; | |
253 | struct page_collect *pcol_copy = NULL; | |
254 | loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT; | |
255 | int ret; | |
256 | ||
257 | if (!pcol->bio) | |
258 | return 0; | |
259 | ||
260 | /* see comment in _readpage() about sync reads */ | |
261 | WARN_ON(is_sync && (pcol->nr_pages != 1)); | |
262 | ||
263 | or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL); | |
264 | if (unlikely(!or)) { | |
265 | ret = -ENOMEM; | |
266 | goto err; | |
267 | } | |
268 | ||
269 | osd_req_read(or, &obj, pcol->bio, i_start); | |
270 | ||
271 | if (is_sync) { | |
272 | exofs_sync_op(or, pcol->sbi->s_timeout, oi->i_cred); | |
273 | return __readpages_done(or, pcol, false); | |
274 | } | |
275 | ||
276 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); | |
277 | if (!pcol_copy) { | |
278 | ret = -ENOMEM; | |
279 | goto err; | |
280 | } | |
281 | ||
282 | *pcol_copy = *pcol; | |
283 | ret = exofs_async_op(or, readpages_done, pcol_copy, oi->i_cred); | |
284 | if (unlikely(ret)) | |
285 | goto err; | |
286 | ||
287 | atomic_inc(&pcol->sbi->s_curr_pending); | |
288 | ||
289 | EXOFS_DBGMSG("read_exec obj=0x%llx start=0x%llx length=0x%lx\n", | |
290 | obj.id, _LLU(i_start), pcol->length); | |
291 | ||
292 | /* pages ownership was passed to pcol_copy */ | |
293 | _pcol_reset(pcol); | |
294 | return 0; | |
295 | ||
296 | err: | |
297 | if (!is_sync) | |
298 | _unlock_pcol_pages(pcol, ret, READ); | |
299 | kfree(pcol_copy); | |
300 | if (or) | |
301 | osd_end_request(or); | |
302 | return ret; | |
303 | } | |
304 | ||
305 | /* readpage_strip is called either directly from readpage() or by the VFS from | |
306 | * within read_cache_pages(), to add one more page to be read. It will try to | |
307 | * collect as many contiguous pages as posible. If a discontinuity is | |
308 | * encountered, or it runs out of resources, it will submit the previous segment | |
309 | * and will start a new collection. Eventually caller must submit the last | |
310 | * segment if present. | |
311 | */ | |
312 | static int readpage_strip(void *data, struct page *page) | |
313 | { | |
314 | struct page_collect *pcol = data; | |
315 | struct inode *inode = pcol->inode; | |
316 | struct exofs_i_info *oi = exofs_i(inode); | |
317 | loff_t i_size = i_size_read(inode); | |
318 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
319 | size_t len; | |
320 | int ret; | |
321 | ||
322 | /* FIXME: Just for debugging, will be removed */ | |
323 | if (PageUptodate(page)) | |
324 | EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino, | |
325 | page->index); | |
326 | ||
327 | if (page->index < end_index) | |
328 | len = PAGE_CACHE_SIZE; | |
329 | else if (page->index == end_index) | |
330 | len = i_size & ~PAGE_CACHE_MASK; | |
331 | else | |
332 | len = 0; | |
333 | ||
334 | if (!len || !obj_created(oi)) { | |
335 | /* this will be out of bounds, or doesn't exist yet. | |
336 | * Current page is cleared and the request is split | |
337 | */ | |
338 | clear_highpage(page); | |
339 | ||
340 | SetPageUptodate(page); | |
341 | if (PageError(page)) | |
342 | ClearPageError(page); | |
343 | ||
344 | unlock_page(page); | |
345 | EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page," | |
346 | " splitting\n", inode->i_ino, page->index); | |
347 | ||
348 | return read_exec(pcol, false); | |
349 | } | |
350 | ||
351 | try_again: | |
352 | ||
353 | if (unlikely(pcol->pg_first == -1)) { | |
354 | pcol->pg_first = page->index; | |
355 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
356 | page->index)) { | |
357 | /* Discontinuity detected, split the request */ | |
358 | ret = read_exec(pcol, false); | |
359 | if (unlikely(ret)) | |
360 | goto fail; | |
361 | goto try_again; | |
362 | } | |
363 | ||
364 | if (!pcol->bio) { | |
365 | ret = pcol_try_alloc(pcol); | |
366 | if (unlikely(ret)) | |
367 | goto fail; | |
368 | } | |
369 | ||
370 | if (len != PAGE_CACHE_SIZE) | |
371 | zero_user(page, len, PAGE_CACHE_SIZE - len); | |
372 | ||
373 | EXOFS_DBGMSG(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", | |
374 | inode->i_ino, page->index, len); | |
375 | ||
376 | ret = pcol_add_page(pcol, page, len); | |
377 | if (ret) { | |
378 | EXOFS_DBGMSG("Failed pcol_add_page pages[i]=%p " | |
379 | "this_len=0x%zx nr_pages=%u length=0x%lx\n", | |
380 | page, len, pcol->nr_pages, pcol->length); | |
381 | ||
382 | /* split the request, and start again with current page */ | |
383 | ret = read_exec(pcol, false); | |
384 | if (unlikely(ret)) | |
385 | goto fail; | |
386 | ||
387 | goto try_again; | |
388 | } | |
389 | ||
390 | return 0; | |
391 | ||
392 | fail: | |
393 | /* SetPageError(page); ??? */ | |
394 | unlock_page(page); | |
395 | return ret; | |
396 | } | |
397 | ||
398 | static int exofs_readpages(struct file *file, struct address_space *mapping, | |
399 | struct list_head *pages, unsigned nr_pages) | |
400 | { | |
401 | struct page_collect pcol; | |
402 | int ret; | |
403 | ||
404 | _pcol_init(&pcol, nr_pages, mapping->host); | |
405 | ||
406 | ret = read_cache_pages(mapping, pages, readpage_strip, &pcol); | |
407 | if (ret) { | |
408 | EXOFS_ERR("read_cache_pages => %d\n", ret); | |
409 | return ret; | |
410 | } | |
411 | ||
412 | return read_exec(&pcol, false); | |
413 | } | |
414 | ||
415 | static int _readpage(struct page *page, bool is_sync) | |
416 | { | |
417 | struct page_collect pcol; | |
418 | int ret; | |
419 | ||
420 | _pcol_init(&pcol, 1, page->mapping->host); | |
421 | ||
422 | /* readpage_strip might call read_exec(,async) inside at several places | |
423 | * but this is safe for is_async=0 since read_exec will not do anything | |
424 | * when we have a single page. | |
425 | */ | |
426 | ret = readpage_strip(&pcol, page); | |
427 | if (ret) { | |
428 | EXOFS_ERR("_readpage => %d\n", ret); | |
429 | return ret; | |
430 | } | |
431 | ||
432 | return read_exec(&pcol, is_sync); | |
433 | } | |
434 | ||
435 | /* | |
436 | * We don't need the file | |
437 | */ | |
438 | static int exofs_readpage(struct file *file, struct page *page) | |
439 | { | |
440 | return _readpage(page, false); | |
441 | } | |
442 | ||
443 | /* Callback for osd_write. All writes are asynchronouse */ | |
444 | static void writepages_done(struct osd_request *or, void *p) | |
445 | { | |
446 | struct page_collect *pcol = p; | |
447 | struct bio_vec *bvec; | |
448 | int i; | |
449 | u64 resid; | |
450 | u64 good_bytes; | |
451 | u64 length = 0; | |
452 | ||
453 | int ret = exofs_check_ok_resid(or, NULL, &resid); | |
454 | ||
455 | osd_end_request(or); | |
456 | atomic_dec(&pcol->sbi->s_curr_pending); | |
457 | ||
458 | if (likely(!ret)) | |
459 | good_bytes = pcol->length; | |
460 | else if (!resid) | |
461 | good_bytes = 0; | |
462 | else | |
463 | good_bytes = pcol->length - resid; | |
464 | ||
465 | EXOFS_DBGMSG("writepages_done(0x%lx) good_bytes=0x%llx" | |
466 | " length=0x%lx nr_pages=%u\n", | |
467 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
468 | pcol->nr_pages); | |
469 | ||
470 | __bio_for_each_segment(bvec, pcol->bio, i, 0) { | |
471 | struct page *page = bvec->bv_page; | |
472 | struct inode *inode = page->mapping->host; | |
473 | int page_stat; | |
474 | ||
475 | if (inode != pcol->inode) | |
476 | continue; /* osd might add more pages to a bio */ | |
477 | ||
478 | if (likely(length < good_bytes)) | |
479 | page_stat = 0; | |
480 | else | |
481 | page_stat = ret; | |
482 | ||
483 | update_write_page(page, page_stat); | |
484 | unlock_page(page); | |
485 | EXOFS_DBGMSG(" writepages_done(0x%lx, 0x%lx) status=%d\n", | |
486 | inode->i_ino, page->index, page_stat); | |
487 | ||
488 | length += bvec->bv_len; | |
489 | } | |
490 | ||
491 | pcol_free(pcol); | |
492 | kfree(pcol); | |
493 | EXOFS_DBGMSG("writepages_done END\n"); | |
494 | } | |
495 | ||
496 | static int write_exec(struct page_collect *pcol) | |
497 | { | |
498 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
499 | struct osd_obj_id obj = {pcol->sbi->s_pid, | |
500 | pcol->inode->i_ino + EXOFS_OBJ_OFF}; | |
501 | struct osd_request *or = NULL; | |
502 | struct page_collect *pcol_copy = NULL; | |
503 | loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT; | |
504 | int ret; | |
505 | ||
506 | if (!pcol->bio) | |
507 | return 0; | |
508 | ||
509 | or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL); | |
510 | if (unlikely(!or)) { | |
511 | EXOFS_ERR("write_exec: Faild to osd_start_request()\n"); | |
512 | ret = -ENOMEM; | |
513 | goto err; | |
514 | } | |
515 | ||
516 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); | |
517 | if (!pcol_copy) { | |
518 | EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n"); | |
519 | ret = -ENOMEM; | |
520 | goto err; | |
521 | } | |
522 | ||
523 | *pcol_copy = *pcol; | |
524 | ||
525 | osd_req_write(or, &obj, pcol_copy->bio, i_start); | |
526 | ret = exofs_async_op(or, writepages_done, pcol_copy, oi->i_cred); | |
527 | if (unlikely(ret)) { | |
528 | EXOFS_ERR("write_exec: exofs_async_op() Faild\n"); | |
529 | goto err; | |
530 | } | |
531 | ||
532 | atomic_inc(&pcol->sbi->s_curr_pending); | |
533 | EXOFS_DBGMSG("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n", | |
534 | pcol->inode->i_ino, pcol->pg_first, _LLU(i_start), | |
535 | pcol->length); | |
536 | /* pages ownership was passed to pcol_copy */ | |
537 | _pcol_reset(pcol); | |
538 | return 0; | |
539 | ||
540 | err: | |
541 | _unlock_pcol_pages(pcol, ret, WRITE); | |
542 | kfree(pcol_copy); | |
543 | if (or) | |
544 | osd_end_request(or); | |
545 | return ret; | |
546 | } | |
547 | ||
548 | /* writepage_strip is called either directly from writepage() or by the VFS from | |
549 | * within write_cache_pages(), to add one more page to be written to storage. | |
550 | * It will try to collect as many contiguous pages as possible. If a | |
551 | * discontinuity is encountered or it runs out of resources it will submit the | |
552 | * previous segment and will start a new collection. | |
553 | * Eventually caller must submit the last segment if present. | |
554 | */ | |
555 | static int writepage_strip(struct page *page, | |
556 | struct writeback_control *wbc_unused, void *data) | |
557 | { | |
558 | struct page_collect *pcol = data; | |
559 | struct inode *inode = pcol->inode; | |
560 | struct exofs_i_info *oi = exofs_i(inode); | |
561 | loff_t i_size = i_size_read(inode); | |
562 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
563 | size_t len; | |
564 | int ret; | |
565 | ||
566 | BUG_ON(!PageLocked(page)); | |
567 | ||
568 | ret = wait_obj_created(oi); | |
569 | if (unlikely(ret)) | |
570 | goto fail; | |
571 | ||
572 | if (page->index < end_index) | |
573 | /* in this case, the page is within the limits of the file */ | |
574 | len = PAGE_CACHE_SIZE; | |
575 | else { | |
576 | len = i_size & ~PAGE_CACHE_MASK; | |
577 | ||
578 | if (page->index > end_index || !len) { | |
579 | /* in this case, the page is outside the limits | |
580 | * (truncate in progress) | |
581 | */ | |
582 | ret = write_exec(pcol); | |
583 | if (unlikely(ret)) | |
584 | goto fail; | |
585 | if (PageError(page)) | |
586 | ClearPageError(page); | |
587 | unlock_page(page); | |
588 | return 0; | |
589 | } | |
590 | } | |
591 | ||
592 | try_again: | |
593 | ||
594 | if (unlikely(pcol->pg_first == -1)) { | |
595 | pcol->pg_first = page->index; | |
596 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
597 | page->index)) { | |
598 | /* Discontinuity detected, split the request */ | |
599 | ret = write_exec(pcol); | |
600 | if (unlikely(ret)) | |
601 | goto fail; | |
602 | goto try_again; | |
603 | } | |
604 | ||
605 | if (!pcol->bio) { | |
606 | ret = pcol_try_alloc(pcol); | |
607 | if (unlikely(ret)) | |
608 | goto fail; | |
609 | } | |
610 | ||
611 | EXOFS_DBGMSG(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", | |
612 | inode->i_ino, page->index, len); | |
613 | ||
614 | ret = pcol_add_page(pcol, page, len); | |
615 | if (unlikely(ret)) { | |
616 | EXOFS_DBGMSG("Failed pcol_add_page " | |
617 | "nr_pages=%u total_length=0x%lx\n", | |
618 | pcol->nr_pages, pcol->length); | |
619 | ||
620 | /* split the request, next loop will start again */ | |
621 | ret = write_exec(pcol); | |
622 | if (unlikely(ret)) { | |
623 | EXOFS_DBGMSG("write_exec faild => %d", ret); | |
624 | goto fail; | |
625 | } | |
626 | ||
627 | goto try_again; | |
628 | } | |
629 | ||
630 | BUG_ON(PageWriteback(page)); | |
631 | set_page_writeback(page); | |
632 | ||
633 | return 0; | |
634 | ||
635 | fail: | |
636 | set_bit(AS_EIO, &page->mapping->flags); | |
637 | unlock_page(page); | |
638 | return ret; | |
639 | } | |
640 | ||
641 | static int exofs_writepages(struct address_space *mapping, | |
642 | struct writeback_control *wbc) | |
643 | { | |
644 | struct page_collect pcol; | |
645 | long start, end, expected_pages; | |
646 | int ret; | |
647 | ||
648 | start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
649 | end = (wbc->range_end == LLONG_MAX) ? | |
650 | start + mapping->nrpages : | |
651 | wbc->range_end >> PAGE_CACHE_SHIFT; | |
652 | ||
653 | if (start || end) | |
654 | expected_pages = min(end - start + 1, 32L); | |
655 | else | |
656 | expected_pages = mapping->nrpages; | |
657 | ||
658 | EXOFS_DBGMSG("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx" | |
659 | " m->nrpages=%lu start=0x%lx end=0x%lx\n", | |
660 | mapping->host->i_ino, wbc->range_start, wbc->range_end, | |
661 | mapping->nrpages, start, end); | |
662 | ||
663 | _pcol_init(&pcol, expected_pages, mapping->host); | |
664 | ||
665 | ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); | |
666 | if (ret) { | |
667 | EXOFS_ERR("write_cache_pages => %d\n", ret); | |
668 | return ret; | |
669 | } | |
670 | ||
671 | return write_exec(&pcol); | |
672 | } | |
673 | ||
674 | static int exofs_writepage(struct page *page, struct writeback_control *wbc) | |
675 | { | |
676 | struct page_collect pcol; | |
677 | int ret; | |
678 | ||
679 | _pcol_init(&pcol, 1, page->mapping->host); | |
680 | ||
681 | ret = writepage_strip(page, NULL, &pcol); | |
682 | if (ret) { | |
683 | EXOFS_ERR("exofs_writepage => %d\n", ret); | |
684 | return ret; | |
685 | } | |
686 | ||
687 | return write_exec(&pcol); | |
688 | } | |
689 | ||
690 | int exofs_write_begin(struct file *file, struct address_space *mapping, | |
691 | loff_t pos, unsigned len, unsigned flags, | |
692 | struct page **pagep, void **fsdata) | |
693 | { | |
694 | int ret = 0; | |
695 | struct page *page; | |
696 | ||
697 | page = *pagep; | |
698 | if (page == NULL) { | |
699 | ret = simple_write_begin(file, mapping, pos, len, flags, pagep, | |
700 | fsdata); | |
701 | if (ret) { | |
702 | EXOFS_DBGMSG("simple_write_begin faild\n"); | |
703 | return ret; | |
704 | } | |
705 | ||
706 | page = *pagep; | |
707 | } | |
708 | ||
709 | /* read modify write */ | |
710 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { | |
711 | ret = _readpage(page, true); | |
712 | if (ret) { | |
713 | /*SetPageError was done by _readpage. Is it ok?*/ | |
714 | unlock_page(page); | |
715 | EXOFS_DBGMSG("__readpage_filler faild\n"); | |
716 | } | |
717 | } | |
718 | ||
719 | return ret; | |
720 | } | |
721 | ||
722 | static int exofs_write_begin_export(struct file *file, | |
723 | struct address_space *mapping, | |
724 | loff_t pos, unsigned len, unsigned flags, | |
725 | struct page **pagep, void **fsdata) | |
726 | { | |
727 | *pagep = NULL; | |
728 | ||
729 | return exofs_write_begin(file, mapping, pos, len, flags, pagep, | |
730 | fsdata); | |
731 | } | |
732 | ||
733 | const struct address_space_operations exofs_aops = { | |
734 | .readpage = exofs_readpage, | |
735 | .readpages = exofs_readpages, | |
736 | .writepage = exofs_writepage, | |
737 | .writepages = exofs_writepages, | |
738 | .write_begin = exofs_write_begin_export, | |
739 | .write_end = simple_write_end, | |
740 | }; | |
741 | ||
e8062719 BH |
742 | /****************************************************************************** |
743 | * INODE OPERATIONS | |
744 | *****************************************************************************/ | |
745 | ||
746 | /* | |
747 | * Test whether an inode is a fast symlink. | |
748 | */ | |
749 | static inline int exofs_inode_is_fast_symlink(struct inode *inode) | |
750 | { | |
751 | struct exofs_i_info *oi = exofs_i(inode); | |
752 | ||
753 | return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); | |
754 | } | |
755 | ||
756 | /* | |
757 | * get_block_t - Fill in a buffer_head | |
758 | * An OSD takes care of block allocation so we just fake an allocation by | |
759 | * putting in the inode's sector_t in the buffer_head. | |
760 | * TODO: What about the case of create==0 and @iblock does not exist in the | |
761 | * object? | |
762 | */ | |
763 | static int exofs_get_block(struct inode *inode, sector_t iblock, | |
764 | struct buffer_head *bh_result, int create) | |
765 | { | |
766 | map_bh(bh_result, inode->i_sb, iblock); | |
767 | return 0; | |
768 | } | |
769 | ||
770 | const struct osd_attr g_attr_logical_length = ATTR_DEF( | |
771 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); | |
772 | ||
773 | /* | |
774 | * Truncate a file to the specified size - all we have to do is set the size | |
775 | * attribute. We make sure the object exists first. | |
776 | */ | |
777 | void exofs_truncate(struct inode *inode) | |
778 | { | |
779 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
780 | struct exofs_i_info *oi = exofs_i(inode); | |
781 | struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF}; | |
782 | struct osd_request *or; | |
783 | struct osd_attr attr; | |
784 | loff_t isize = i_size_read(inode); | |
785 | __be64 newsize; | |
786 | int ret; | |
787 | ||
788 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) | |
789 | || S_ISLNK(inode->i_mode))) | |
790 | return; | |
791 | if (exofs_inode_is_fast_symlink(inode)) | |
792 | return; | |
793 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
794 | return; | |
795 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
796 | ||
797 | nobh_truncate_page(inode->i_mapping, isize, exofs_get_block); | |
798 | ||
799 | or = osd_start_request(sbi->s_dev, GFP_KERNEL); | |
800 | if (unlikely(!or)) { | |
801 | EXOFS_ERR("ERROR: exofs_truncate: osd_start_request failed\n"); | |
802 | goto fail; | |
803 | } | |
804 | ||
805 | osd_req_set_attributes(or, &obj); | |
806 | ||
807 | newsize = cpu_to_be64((u64)isize); | |
808 | attr = g_attr_logical_length; | |
809 | attr.val_ptr = &newsize; | |
810 | osd_req_add_set_attr_list(or, &attr, 1); | |
811 | ||
812 | /* if we are about to truncate an object, and it hasn't been | |
813 | * created yet, wait | |
814 | */ | |
815 | if (unlikely(wait_obj_created(oi))) | |
816 | goto fail; | |
817 | ||
818 | ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred); | |
819 | osd_end_request(or); | |
820 | if (ret) | |
821 | goto fail; | |
822 | ||
823 | out: | |
824 | mark_inode_dirty(inode); | |
825 | return; | |
826 | fail: | |
827 | make_bad_inode(inode); | |
828 | goto out; | |
829 | } | |
830 | ||
831 | /* | |
832 | * Set inode attributes - just call generic functions. | |
833 | */ | |
834 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) | |
835 | { | |
836 | struct inode *inode = dentry->d_inode; | |
837 | int error; | |
838 | ||
839 | error = inode_change_ok(inode, iattr); | |
840 | if (error) | |
841 | return error; | |
842 | ||
843 | error = inode_setattr(inode, iattr); | |
844 | return error; | |
845 | } | |
e6af00f1 BH |
846 | |
847 | /* | |
848 | * Read an inode from the OSD, and return it as is. We also return the size | |
849 | * attribute in the 'sanity' argument if we got compiled with debugging turned | |
850 | * on. | |
851 | */ | |
852 | static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, | |
853 | struct exofs_fcb *inode, uint64_t *sanity) | |
854 | { | |
855 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
856 | struct osd_request *or; | |
857 | struct osd_attr attr; | |
858 | struct osd_obj_id obj = {sbi->s_pid, | |
859 | oi->vfs_inode.i_ino + EXOFS_OBJ_OFF}; | |
860 | int ret; | |
861 | ||
862 | exofs_make_credential(oi->i_cred, &obj); | |
863 | ||
864 | or = osd_start_request(sbi->s_dev, GFP_KERNEL); | |
865 | if (unlikely(!or)) { | |
866 | EXOFS_ERR("exofs_get_inode: osd_start_request failed.\n"); | |
867 | return -ENOMEM; | |
868 | } | |
869 | osd_req_get_attributes(or, &obj); | |
870 | ||
871 | /* we need the inode attribute */ | |
872 | osd_req_add_get_attr_list(or, &g_attr_inode_data, 1); | |
873 | ||
874 | #ifdef EXOFS_DEBUG_OBJ_ISIZE | |
875 | /* we get the size attributes to do a sanity check */ | |
876 | osd_req_add_get_attr_list(or, &g_attr_logical_length, 1); | |
877 | #endif | |
878 | ||
879 | ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred); | |
880 | if (ret) | |
881 | goto out; | |
882 | ||
883 | attr = g_attr_inode_data; | |
884 | ret = extract_attr_from_req(or, &attr); | |
885 | if (ret) { | |
886 | EXOFS_ERR("exofs_get_inode: extract_attr_from_req failed\n"); | |
887 | goto out; | |
888 | } | |
889 | ||
890 | WARN_ON(attr.len != EXOFS_INO_ATTR_SIZE); | |
891 | memcpy(inode, attr.val_ptr, EXOFS_INO_ATTR_SIZE); | |
892 | ||
893 | #ifdef EXOFS_DEBUG_OBJ_ISIZE | |
894 | attr = g_attr_logical_length; | |
895 | ret = extract_attr_from_req(or, &attr); | |
896 | if (ret) { | |
897 | EXOFS_ERR("ERROR: extract attr from or failed\n"); | |
898 | goto out; | |
899 | } | |
900 | *sanity = get_unaligned_be64(attr.val_ptr); | |
901 | #endif | |
902 | ||
903 | out: | |
904 | osd_end_request(or); | |
905 | return ret; | |
906 | } | |
907 | ||
908 | /* | |
909 | * Fill in an inode read from the OSD and set it up for use | |
910 | */ | |
911 | struct inode *exofs_iget(struct super_block *sb, unsigned long ino) | |
912 | { | |
913 | struct exofs_i_info *oi; | |
914 | struct exofs_fcb fcb; | |
915 | struct inode *inode; | |
916 | uint64_t uninitialized_var(sanity); | |
917 | int ret; | |
918 | ||
919 | inode = iget_locked(sb, ino); | |
920 | if (!inode) | |
921 | return ERR_PTR(-ENOMEM); | |
922 | if (!(inode->i_state & I_NEW)) | |
923 | return inode; | |
924 | oi = exofs_i(inode); | |
925 | ||
926 | /* read the inode from the osd */ | |
927 | ret = exofs_get_inode(sb, oi, &fcb, &sanity); | |
928 | if (ret) | |
929 | goto bad_inode; | |
930 | ||
931 | init_waitqueue_head(&oi->i_wq); | |
932 | set_obj_created(oi); | |
933 | ||
934 | /* copy stuff from on-disk struct to in-memory struct */ | |
935 | inode->i_mode = le16_to_cpu(fcb.i_mode); | |
936 | inode->i_uid = le32_to_cpu(fcb.i_uid); | |
937 | inode->i_gid = le32_to_cpu(fcb.i_gid); | |
938 | inode->i_nlink = le16_to_cpu(fcb.i_links_count); | |
939 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime); | |
940 | inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime); | |
941 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime); | |
942 | inode->i_ctime.tv_nsec = | |
943 | inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0; | |
944 | oi->i_commit_size = le64_to_cpu(fcb.i_size); | |
945 | i_size_write(inode, oi->i_commit_size); | |
946 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
947 | inode->i_generation = le32_to_cpu(fcb.i_generation); | |
948 | ||
949 | #ifdef EXOFS_DEBUG_OBJ_ISIZE | |
950 | if ((inode->i_size != sanity) && | |
951 | (!exofs_inode_is_fast_symlink(inode))) { | |
952 | EXOFS_ERR("WARNING: Size of object from inode and " | |
953 | "attributes differ (%lld != %llu)\n", | |
954 | inode->i_size, _LLU(sanity)); | |
955 | } | |
956 | #endif | |
957 | ||
958 | oi->i_dir_start_lookup = 0; | |
959 | ||
960 | if ((inode->i_nlink == 0) && (inode->i_mode == 0)) { | |
961 | ret = -ESTALE; | |
962 | goto bad_inode; | |
963 | } | |
964 | ||
965 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
966 | if (fcb.i_data[0]) | |
967 | inode->i_rdev = | |
968 | old_decode_dev(le32_to_cpu(fcb.i_data[0])); | |
969 | else | |
970 | inode->i_rdev = | |
971 | new_decode_dev(le32_to_cpu(fcb.i_data[1])); | |
972 | } else { | |
973 | memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); | |
974 | } | |
975 | ||
976 | if (S_ISREG(inode->i_mode)) { | |
977 | inode->i_op = &exofs_file_inode_operations; | |
978 | inode->i_fop = &exofs_file_operations; | |
979 | inode->i_mapping->a_ops = &exofs_aops; | |
980 | } else if (S_ISDIR(inode->i_mode)) { | |
981 | inode->i_op = &exofs_dir_inode_operations; | |
982 | inode->i_fop = &exofs_dir_operations; | |
983 | inode->i_mapping->a_ops = &exofs_aops; | |
984 | } else if (S_ISLNK(inode->i_mode)) { | |
985 | if (exofs_inode_is_fast_symlink(inode)) | |
986 | inode->i_op = &exofs_fast_symlink_inode_operations; | |
987 | else { | |
988 | inode->i_op = &exofs_symlink_inode_operations; | |
989 | inode->i_mapping->a_ops = &exofs_aops; | |
990 | } | |
991 | } else { | |
992 | inode->i_op = &exofs_special_inode_operations; | |
993 | if (fcb.i_data[0]) | |
994 | init_special_inode(inode, inode->i_mode, | |
995 | old_decode_dev(le32_to_cpu(fcb.i_data[0]))); | |
996 | else | |
997 | init_special_inode(inode, inode->i_mode, | |
998 | new_decode_dev(le32_to_cpu(fcb.i_data[1]))); | |
999 | } | |
1000 | ||
1001 | unlock_new_inode(inode); | |
1002 | return inode; | |
1003 | ||
1004 | bad_inode: | |
1005 | iget_failed(inode); | |
1006 | return ERR_PTR(ret); | |
1007 | } | |
1008 | ||
1009 | int __exofs_wait_obj_created(struct exofs_i_info *oi) | |
1010 | { | |
1011 | if (!obj_created(oi)) { | |
1012 | BUG_ON(!obj_2bcreated(oi)); | |
1013 | wait_event(oi->i_wq, obj_created(oi)); | |
1014 | } | |
1015 | return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; | |
1016 | } | |
1017 | /* | |
1018 | * Callback function from exofs_new_inode(). The important thing is that we | |
1019 | * set the obj_created flag so that other methods know that the object exists on | |
1020 | * the OSD. | |
1021 | */ | |
1022 | static void create_done(struct osd_request *or, void *p) | |
1023 | { | |
1024 | struct inode *inode = p; | |
1025 | struct exofs_i_info *oi = exofs_i(inode); | |
1026 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
1027 | int ret; | |
1028 | ||
1029 | ret = exofs_check_ok(or); | |
1030 | osd_end_request(or); | |
1031 | atomic_dec(&sbi->s_curr_pending); | |
1032 | ||
1033 | if (unlikely(ret)) { | |
1034 | EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx", | |
1035 | _LLU(sbi->s_pid), _LLU(inode->i_ino + EXOFS_OBJ_OFF)); | |
1036 | make_bad_inode(inode); | |
1037 | } else | |
1038 | set_obj_created(oi); | |
1039 | ||
1040 | atomic_dec(&inode->i_count); | |
1041 | wake_up(&oi->i_wq); | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * Set up a new inode and create an object for it on the OSD | |
1046 | */ | |
1047 | struct inode *exofs_new_inode(struct inode *dir, int mode) | |
1048 | { | |
1049 | struct super_block *sb; | |
1050 | struct inode *inode; | |
1051 | struct exofs_i_info *oi; | |
1052 | struct exofs_sb_info *sbi; | |
1053 | struct osd_request *or; | |
1054 | struct osd_obj_id obj; | |
1055 | int ret; | |
1056 | ||
1057 | sb = dir->i_sb; | |
1058 | inode = new_inode(sb); | |
1059 | if (!inode) | |
1060 | return ERR_PTR(-ENOMEM); | |
1061 | ||
1062 | oi = exofs_i(inode); | |
1063 | ||
1064 | init_waitqueue_head(&oi->i_wq); | |
1065 | set_obj_2bcreated(oi); | |
1066 | ||
1067 | sbi = sb->s_fs_info; | |
1068 | ||
1069 | sb->s_dirt = 1; | |
1070 | inode->i_uid = current->cred->fsuid; | |
1071 | if (dir->i_mode & S_ISGID) { | |
1072 | inode->i_gid = dir->i_gid; | |
1073 | if (S_ISDIR(mode)) | |
1074 | mode |= S_ISGID; | |
1075 | } else { | |
1076 | inode->i_gid = current->cred->fsgid; | |
1077 | } | |
1078 | inode->i_mode = mode; | |
1079 | ||
1080 | inode->i_ino = sbi->s_nextid++; | |
1081 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1082 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1083 | oi->i_commit_size = inode->i_size = 0; | |
1084 | spin_lock(&sbi->s_next_gen_lock); | |
1085 | inode->i_generation = sbi->s_next_generation++; | |
1086 | spin_unlock(&sbi->s_next_gen_lock); | |
1087 | insert_inode_hash(inode); | |
1088 | ||
1089 | mark_inode_dirty(inode); | |
1090 | ||
1091 | obj.partition = sbi->s_pid; | |
1092 | obj.id = inode->i_ino + EXOFS_OBJ_OFF; | |
1093 | exofs_make_credential(oi->i_cred, &obj); | |
1094 | ||
1095 | or = osd_start_request(sbi->s_dev, GFP_KERNEL); | |
1096 | if (unlikely(!or)) { | |
1097 | EXOFS_ERR("exofs_new_inode: osd_start_request failed\n"); | |
1098 | return ERR_PTR(-ENOMEM); | |
1099 | } | |
1100 | ||
1101 | osd_req_create_object(or, &obj); | |
1102 | ||
1103 | /* increment the refcount so that the inode will still be around when we | |
1104 | * reach the callback | |
1105 | */ | |
1106 | atomic_inc(&inode->i_count); | |
1107 | ||
1108 | ret = exofs_async_op(or, create_done, inode, oi->i_cred); | |
1109 | if (ret) { | |
1110 | atomic_dec(&inode->i_count); | |
1111 | osd_end_request(or); | |
1112 | return ERR_PTR(-EIO); | |
1113 | } | |
1114 | atomic_inc(&sbi->s_curr_pending); | |
1115 | ||
1116 | return inode; | |
1117 | } |