Commit | Line | Data |
---|---|---|
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 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
e8062719 BH |
35 | |
36 | #include "exofs.h" | |
37 | ||
fe33cc1e BH |
38 | #define EXOFS_DBGMSG2(M...) do {} while (0) |
39 | ||
5a51c0c7 | 40 | enum {MAX_PAGES_KMALLOC = PAGE_SIZE / sizeof(struct page *), }; |
06886a5a | 41 | |
8ff660ab | 42 | unsigned exofs_max_io_pages(struct ore_layout *layout, |
66cd6cad | 43 | unsigned expected_pages) |
44 | { | |
45 | unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC); | |
46 | ||
47 | /* TODO: easily support bio chaining */ | |
5a51c0c7 | 48 | pages = min_t(unsigned, pages, layout->max_io_length / PAGE_SIZE); |
66cd6cad | 49 | return pages; |
50 | } | |
51 | ||
beaec07b BH |
52 | struct page_collect { |
53 | struct exofs_sb_info *sbi; | |
beaec07b BH |
54 | struct inode *inode; |
55 | unsigned expected_pages; | |
8ff660ab | 56 | struct ore_io_state *ios; |
beaec07b | 57 | |
86093aaf BH |
58 | struct page **pages; |
59 | unsigned alloc_pages; | |
beaec07b BH |
60 | unsigned nr_pages; |
61 | unsigned long length; | |
62 | loff_t pg_first; /* keep 64bit also in 32-arches */ | |
f17b1f9f BH |
63 | bool read_4_write; /* This means two things: that the read is sync |
64 | * And the pages should not be unlocked. | |
65 | */ | |
dd296619 | 66 | struct page *that_locked_page; |
beaec07b BH |
67 | }; |
68 | ||
69 | static void _pcol_init(struct page_collect *pcol, unsigned expected_pages, | |
06886a5a | 70 | struct inode *inode) |
beaec07b BH |
71 | { |
72 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
beaec07b BH |
73 | |
74 | pcol->sbi = sbi; | |
beaec07b BH |
75 | pcol->inode = inode; |
76 | pcol->expected_pages = expected_pages; | |
77 | ||
06886a5a | 78 | pcol->ios = NULL; |
86093aaf BH |
79 | pcol->pages = NULL; |
80 | pcol->alloc_pages = 0; | |
beaec07b BH |
81 | pcol->nr_pages = 0; |
82 | pcol->length = 0; | |
83 | pcol->pg_first = -1; | |
f17b1f9f | 84 | pcol->read_4_write = false; |
dd296619 | 85 | pcol->that_locked_page = NULL; |
beaec07b BH |
86 | } |
87 | ||
88 | static void _pcol_reset(struct page_collect *pcol) | |
89 | { | |
90 | pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages); | |
91 | ||
86093aaf BH |
92 | pcol->pages = NULL; |
93 | pcol->alloc_pages = 0; | |
beaec07b BH |
94 | pcol->nr_pages = 0; |
95 | pcol->length = 0; | |
96 | pcol->pg_first = -1; | |
06886a5a | 97 | pcol->ios = NULL; |
dd296619 | 98 | pcol->that_locked_page = NULL; |
beaec07b BH |
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) | |
86093aaf | 104 | pcol->expected_pages = MAX_PAGES_KMALLOC; |
beaec07b BH |
105 | } |
106 | ||
107 | static int pcol_try_alloc(struct page_collect *pcol) | |
108 | { | |
66cd6cad | 109 | unsigned pages; |
06886a5a | 110 | |
86093aaf | 111 | /* TODO: easily support bio chaining */ |
66cd6cad | 112 | pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages); |
86093aaf | 113 | |
beaec07b | 114 | for (; pages; pages >>= 1) { |
86093aaf BH |
115 | pcol->pages = kmalloc(pages * sizeof(struct page *), |
116 | GFP_KERNEL); | |
117 | if (likely(pcol->pages)) { | |
118 | pcol->alloc_pages = pages; | |
beaec07b | 119 | return 0; |
86093aaf | 120 | } |
beaec07b BH |
121 | } |
122 | ||
86093aaf | 123 | EXOFS_ERR("Failed to kmalloc expected_pages=%u\n", |
beaec07b BH |
124 | pcol->expected_pages); |
125 | return -ENOMEM; | |
126 | } | |
127 | ||
128 | static void pcol_free(struct page_collect *pcol) | |
129 | { | |
86093aaf BH |
130 | kfree(pcol->pages); |
131 | pcol->pages = NULL; | |
06886a5a BH |
132 | |
133 | if (pcol->ios) { | |
8ff660ab | 134 | ore_put_io_state(pcol->ios); |
06886a5a BH |
135 | pcol->ios = NULL; |
136 | } | |
beaec07b BH |
137 | } |
138 | ||
139 | static int pcol_add_page(struct page_collect *pcol, struct page *page, | |
140 | unsigned len) | |
141 | { | |
86093aaf | 142 | if (unlikely(pcol->nr_pages >= pcol->alloc_pages)) |
beaec07b BH |
143 | return -ENOMEM; |
144 | ||
86093aaf | 145 | pcol->pages[pcol->nr_pages++] = page; |
beaec07b BH |
146 | pcol->length += len; |
147 | return 0; | |
148 | } | |
149 | ||
154a9300 | 150 | enum {PAGE_WAS_NOT_IN_IO = 17}; |
beaec07b BH |
151 | static int update_read_page(struct page *page, int ret) |
152 | { | |
154a9300 BH |
153 | switch (ret) { |
154 | case 0: | |
beaec07b BH |
155 | /* Everything is OK */ |
156 | SetPageUptodate(page); | |
157 | if (PageError(page)) | |
158 | ClearPageError(page); | |
154a9300 BH |
159 | break; |
160 | case -EFAULT: | |
beaec07b BH |
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); | |
beaec07b | 171 | EXOFS_DBGMSG("recovered read error\n"); |
154a9300 BH |
172 | /* fall through */ |
173 | case PAGE_WAS_NOT_IN_IO: | |
174 | ret = 0; /* recovered error */ | |
175 | break; | |
176 | default: | |
beaec07b | 177 | SetPageError(page); |
154a9300 | 178 | } |
beaec07b BH |
179 | return ret; |
180 | } | |
181 | ||
182 | static void update_write_page(struct page *page, int ret) | |
183 | { | |
154a9300 BH |
184 | if (unlikely(ret == PAGE_WAS_NOT_IN_IO)) |
185 | return; /* don't pass start don't collect $200 */ | |
186 | ||
beaec07b BH |
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 | */ | |
7aebf410 | 197 | static int __readpages_done(struct page_collect *pcol) |
beaec07b | 198 | { |
beaec07b | 199 | int i; |
beaec07b BH |
200 | u64 good_bytes; |
201 | u64 length = 0; | |
4b46c9f5 | 202 | int ret = ore_check_io(pcol->ios, NULL); |
beaec07b | 203 | |
154a9300 | 204 | if (likely(!ret)) { |
beaec07b | 205 | good_bytes = pcol->length; |
154a9300 BH |
206 | ret = PAGE_WAS_NOT_IN_IO; |
207 | } else { | |
4b46c9f5 | 208 | good_bytes = 0; |
154a9300 | 209 | } |
beaec07b | 210 | |
34ce4e7c | 211 | EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
212 | " length=0x%lx nr_pages=%u\n", |
213 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
214 | pcol->nr_pages); | |
215 | ||
86093aaf BH |
216 | for (i = 0; i < pcol->nr_pages; i++) { |
217 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
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 | ||
fe33cc1e | 229 | EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n", |
beaec07b BH |
230 | inode->i_ino, page->index, |
231 | page_stat ? "bad_bytes" : "good_bytes"); | |
232 | ||
233 | ret = update_read_page(page, page_stat); | |
7aebf410 | 234 | if (!pcol->read_4_write) |
beaec07b | 235 | unlock_page(page); |
86093aaf | 236 | length += PAGE_SIZE; |
beaec07b BH |
237 | } |
238 | ||
239 | pcol_free(pcol); | |
34ce4e7c | 240 | EXOFS_DBGMSG2("readpages_done END\n"); |
beaec07b BH |
241 | return ret; |
242 | } | |
243 | ||
244 | /* callback of async reads */ | |
8ff660ab | 245 | static void readpages_done(struct ore_io_state *ios, void *p) |
beaec07b BH |
246 | { |
247 | struct page_collect *pcol = p; | |
248 | ||
7aebf410 | 249 | __readpages_done(pcol); |
beaec07b | 250 | atomic_dec(&pcol->sbi->s_curr_pending); |
06886a5a | 251 | kfree(pcol); |
beaec07b BH |
252 | } |
253 | ||
254 | static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) | |
255 | { | |
beaec07b BH |
256 | int i; |
257 | ||
86093aaf BH |
258 | for (i = 0; i < pcol->nr_pages; i++) { |
259 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
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 | } | |
beaec07b BH |
268 | } |
269 | ||
b916c5cd BH |
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 | ||
7aebf410 | 310 | static int read_exec(struct page_collect *pcol) |
beaec07b BH |
311 | { |
312 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
8ff660ab | 313 | struct ore_io_state *ios; |
beaec07b | 314 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
315 | int ret; |
316 | ||
86093aaf | 317 | if (!pcol->pages) |
beaec07b BH |
318 | return 0; |
319 | ||
e1042ba0 | 320 | if (!pcol->ios) { |
5bf696da | 321 | int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true, |
e1042ba0 BH |
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; | |
86093aaf | 330 | ios->pages = pcol->pages; |
beaec07b | 331 | |
7aebf410 | 332 | if (pcol->read_4_write) { |
8ff660ab | 333 | ore_read(pcol->ios); |
7aebf410 | 334 | return __readpages_done(pcol); |
beaec07b BH |
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; | |
06886a5a BH |
344 | ios->done = readpages_done; |
345 | ios->private = pcol_copy; | |
b916c5cd BH |
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 | ||
8ff660ab | 357 | ret = ore_read(ios); |
beaec07b BH |
358 | if (unlikely(ret)) |
359 | goto err; | |
360 | ||
361 | atomic_inc(&pcol->sbi->s_curr_pending); | |
362 | ||
beaec07b BH |
363 | return 0; |
364 | ||
365 | err: | |
7aebf410 | 366 | if (!pcol->read_4_write) |
beaec07b | 367 | _unlock_pcol_pages(pcol, ret, READ); |
06886a5a BH |
368 | |
369 | pcol_free(pcol); | |
b76a3f93 | 370 | |
beaec07b | 371 | kfree(pcol_copy); |
beaec07b BH |
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 | ||
dd296619 BH |
397 | pcol->that_locked_page = page; |
398 | ||
beaec07b BH |
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 | ||
f17b1f9f BH |
416 | if (!pcol->read_4_write) |
417 | unlock_page(page); | |
a8f1418f BH |
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); | |
beaec07b | 422 | |
7aebf410 | 423 | return read_exec(pcol); |
beaec07b BH |
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 */ | |
7aebf410 | 433 | ret = read_exec(pcol); |
beaec07b BH |
434 | if (unlikely(ret)) |
435 | goto fail; | |
436 | goto try_again; | |
437 | } | |
438 | ||
86093aaf | 439 | if (!pcol->pages) { |
beaec07b BH |
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 | ||
fe33cc1e | 448 | EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
449 | inode->i_ino, page->index, len); |
450 | ||
451 | ret = pcol_add_page(pcol, page, len); | |
452 | if (ret) { | |
fe33cc1e | 453 | EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p " |
beaec07b BH |
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 */ | |
7aebf410 | 458 | ret = read_exec(pcol); |
beaec07b BH |
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 | ||
b916c5cd BH |
487 | ret = read_exec(&pcol); |
488 | if (unlikely(ret)) | |
489 | return ret; | |
490 | ||
7aebf410 | 491 | return read_exec(&pcol); |
beaec07b BH |
492 | } |
493 | ||
7aebf410 | 494 | static int _readpage(struct page *page, bool read_4_write) |
beaec07b BH |
495 | { |
496 | struct page_collect pcol; | |
497 | int ret; | |
498 | ||
499 | _pcol_init(&pcol, 1, page->mapping->host); | |
500 | ||
7aebf410 | 501 | pcol.read_4_write = read_4_write; |
beaec07b BH |
502 | ret = readpage_strip(&pcol, page); |
503 | if (ret) { | |
504 | EXOFS_ERR("_readpage => %d\n", ret); | |
505 | return ret; | |
506 | } | |
507 | ||
7aebf410 | 508 | return read_exec(&pcol); |
beaec07b BH |
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 | ||
06886a5a | 519 | /* Callback for osd_write. All writes are asynchronous */ |
8ff660ab | 520 | static void writepages_done(struct ore_io_state *ios, void *p) |
beaec07b BH |
521 | { |
522 | struct page_collect *pcol = p; | |
beaec07b | 523 | int i; |
beaec07b BH |
524 | u64 good_bytes; |
525 | u64 length = 0; | |
4b46c9f5 | 526 | int ret = ore_check_io(ios, NULL); |
beaec07b | 527 | |
beaec07b BH |
528 | atomic_dec(&pcol->sbi->s_curr_pending); |
529 | ||
154a9300 | 530 | if (likely(!ret)) { |
beaec07b | 531 | good_bytes = pcol->length; |
154a9300 BH |
532 | ret = PAGE_WAS_NOT_IN_IO; |
533 | } else { | |
4b46c9f5 | 534 | good_bytes = 0; |
154a9300 | 535 | } |
beaec07b | 536 | |
34ce4e7c | 537 | EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
538 | " length=0x%lx nr_pages=%u\n", |
539 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
540 | pcol->nr_pages); | |
541 | ||
86093aaf BH |
542 | for (i = 0; i < pcol->nr_pages; i++) { |
543 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
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); | |
fe33cc1e | 557 | EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n", |
beaec07b BH |
558 | inode->i_ino, page->index, page_stat); |
559 | ||
86093aaf | 560 | length += PAGE_SIZE; |
beaec07b BH |
561 | } |
562 | ||
563 | pcol_free(pcol); | |
564 | kfree(pcol); | |
34ce4e7c | 565 | EXOFS_DBGMSG2("writepages_done END\n"); |
beaec07b BH |
566 | } |
567 | ||
dd296619 BH |
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 | ||
beaec07b BH |
618 | static int write_exec(struct page_collect *pcol) |
619 | { | |
620 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
8ff660ab | 621 | struct ore_io_state *ios; |
beaec07b | 622 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
623 | int ret; |
624 | ||
86093aaf | 625 | if (!pcol->pages) |
beaec07b BH |
626 | return 0; |
627 | ||
e1042ba0 | 628 | BUG_ON(pcol->ios); |
5bf696da | 629 | ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false, |
e1042ba0 BH |
630 | pcol->pg_first << PAGE_CACHE_SHIFT, |
631 | pcol->length, &pcol->ios); | |
e1042ba0 BH |
632 | if (unlikely(ret)) |
633 | goto err; | |
634 | ||
beaec07b BH |
635 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
636 | if (!pcol_copy) { | |
571f7f46 | 637 | EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n"); |
beaec07b BH |
638 | ret = -ENOMEM; |
639 | goto err; | |
640 | } | |
641 | ||
642 | *pcol_copy = *pcol; | |
643 | ||
e1042ba0 | 644 | ios = pcol->ios; |
86093aaf | 645 | ios->pages = pcol_copy->pages; |
06886a5a | 646 | ios->done = writepages_done; |
dd296619 | 647 | ios->r4w = &_r4w_op; |
06886a5a BH |
648 | ios->private = pcol_copy; |
649 | ||
b916c5cd BH |
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 | ||
8ff660ab | 660 | ret = ore_write(ios); |
beaec07b | 661 | if (unlikely(ret)) { |
8ff660ab | 662 | EXOFS_ERR("write_exec: ore_write() Failed\n"); |
beaec07b BH |
663 | goto err; |
664 | } | |
665 | ||
666 | atomic_inc(&pcol->sbi->s_curr_pending); | |
beaec07b BH |
667 | return 0; |
668 | ||
669 | err: | |
670 | _unlock_pcol_pages(pcol, ret, WRITE); | |
06886a5a | 671 | pcol_free(pcol); |
beaec07b | 672 | kfree(pcol_copy); |
06886a5a | 673 | |
beaec07b BH |
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); | |
06886a5a BH |
717 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) " |
718 | "outside the limits\n", | |
719 | inode->i_ino, page->index); | |
beaec07b BH |
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; | |
06886a5a BH |
734 | |
735 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n", | |
736 | inode->i_ino, page->index); | |
beaec07b BH |
737 | goto try_again; |
738 | } | |
739 | ||
86093aaf | 740 | if (!pcol->pages) { |
beaec07b BH |
741 | ret = pcol_try_alloc(pcol); |
742 | if (unlikely(ret)) | |
743 | goto fail; | |
744 | } | |
745 | ||
fe33cc1e | 746 | EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
747 | inode->i_ino, page->index, len); |
748 | ||
749 | ret = pcol_add_page(pcol, page, len); | |
750 | if (unlikely(ret)) { | |
34ce4e7c | 751 | EXOFS_DBGMSG2("Failed pcol_add_page " |
beaec07b BH |
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)) { | |
571f7f46 | 758 | EXOFS_DBGMSG("write_exec failed => %d", ret); |
beaec07b BH |
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: | |
06886a5a BH |
771 | EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n", |
772 | inode->i_ino, page->index, ret); | |
beaec07b BH |
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) | |
06886a5a | 791 | expected_pages = end - start + 1; |
beaec07b BH |
792 | else |
793 | expected_pages = mapping->nrpages; | |
794 | ||
06886a5a BH |
795 | if (expected_pages < 32L) |
796 | expected_pages = 32L; | |
797 | ||
34ce4e7c | 798 | EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx " |
06886a5a | 799 | "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n", |
beaec07b | 800 | mapping->host->i_ino, wbc->range_start, wbc->range_end, |
06886a5a | 801 | mapping->nrpages, start, end, expected_pages); |
beaec07b BH |
802 | |
803 | _pcol_init(&pcol, expected_pages, mapping->host); | |
804 | ||
805 | ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); | |
b916c5cd | 806 | if (unlikely(ret)) { |
beaec07b BH |
807 | EXOFS_ERR("write_cache_pages => %d\n", ret); |
808 | return ret; | |
809 | } | |
810 | ||
b916c5cd BH |
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; | |
beaec07b BH |
830 | } |
831 | ||
dd296619 | 832 | /* |
beaec07b BH |
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 | } | |
dd296619 | 848 | */ |
2f246fd0 BH |
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 | ||
beaec07b BH |
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) { | |
571f7f46 | 868 | EXOFS_DBGMSG("simple_write_begin failed\n"); |
2f246fd0 | 869 | goto out; |
beaec07b BH |
870 | } |
871 | ||
872 | page = *pagep; | |
873 | } | |
874 | ||
875 | /* read modify write */ | |
876 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { | |
a8f1418f BH |
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 | ||
beaec07b BH |
894 | ret = _readpage(page, true); |
895 | if (ret) { | |
896 | /*SetPageError was done by _readpage. Is it ok?*/ | |
897 | unlock_page(page); | |
a8f1418f | 898 | EXOFS_DBGMSG("__readpage failed\n"); |
beaec07b BH |
899 | } |
900 | } | |
2f246fd0 BH |
901 | out: |
902 | if (unlikely(ret)) | |
903 | _write_failed(mapping->host, pos + len); | |
beaec07b BH |
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 | ||
efd124b9 BH |
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); | |
2f246fd0 BH |
929 | if (unlikely(ret)) |
930 | _write_failed(inode, pos + len); | |
931 | ||
932 | /* TODO: once simple_write_end marks inode dirty remove */ | |
efd124b9 BH |
933 | if (i_size != inode->i_size) |
934 | mark_inode_dirty(inode); | |
935 | return ret; | |
936 | } | |
937 | ||
200b0700 BH |
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); | |
85dc7878 | 942 | return 0; |
200b0700 BH |
943 | } |
944 | ||
945 | static void exofs_invalidatepage(struct page *page, unsigned long offset) | |
946 | { | |
85dc7878 | 947 | EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset); |
200b0700 | 948 | WARN_ON(1); |
200b0700 BH |
949 | } |
950 | ||
beaec07b BH |
951 | const struct address_space_operations exofs_aops = { |
952 | .readpage = exofs_readpage, | |
953 | .readpages = exofs_readpages, | |
dd296619 | 954 | .writepage = NULL, |
beaec07b BH |
955 | .writepages = exofs_writepages, |
956 | .write_begin = exofs_write_begin_export, | |
efd124b9 | 957 | .write_end = exofs_write_end, |
200b0700 BH |
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 */ | |
200b0700 BH |
967 | .get_xip_mem = NULL, |
968 | .migratepage = NULL, | |
969 | .launder_page = NULL, | |
970 | .is_partially_uptodate = NULL, | |
971 | .error_remove_page = NULL, | |
beaec07b BH |
972 | }; |
973 | ||
e8062719 BH |
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 | ||
2f246fd0 | 988 | static int _do_truncate(struct inode *inode, loff_t newsize) |
06886a5a BH |
989 | { |
990 | struct exofs_i_info *oi = exofs_i(inode); | |
9e9db456 | 991 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; |
06886a5a BH |
992 | int ret; |
993 | ||
994 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
995 | ||
5bf696da | 996 | ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize); |
2f246fd0 BH |
997 | if (likely(!ret)) |
998 | truncate_setsize(inode, newsize); | |
06886a5a | 999 | |
2f246fd0 BH |
1000 | EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n", |
1001 | inode->i_ino, newsize, ret); | |
06886a5a BH |
1002 | return ret; |
1003 | } | |
1004 | ||
e8062719 | 1005 | /* |
2f246fd0 BH |
1006 | * Set inode attributes - update size attribute on OSD if needed, |
1007 | * otherwise just call generic functions. | |
e8062719 BH |
1008 | */ |
1009 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) | |
1010 | { | |
1011 | struct inode *inode = dentry->d_inode; | |
1012 | int error; | |
1013 | ||
2f246fd0 BH |
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 | ||
e8062719 | 1021 | error = inode_change_ok(inode, iattr); |
2f246fd0 | 1022 | if (unlikely(error)) |
e8062719 BH |
1023 | return error; |
1024 | ||
1025774c CH |
1025 | if ((iattr->ia_valid & ATTR_SIZE) && |
1026 | iattr->ia_size != i_size_read(inode)) { | |
2f246fd0 BH |
1027 | error = _do_truncate(inode, iattr->ia_size); |
1028 | if (unlikely(error)) | |
1025774c CH |
1029 | return error; |
1030 | } | |
1031 | ||
1032 | setattr_copy(inode, iattr); | |
1033 | mark_inode_dirty(inode); | |
1034 | return 0; | |
e8062719 | 1035 | } |
e6af00f1 | 1036 | |
d9c740d2 BH |
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 | ||
e6af00f1 | 1046 | /* |
5d952b83 BH |
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. | |
e6af00f1 BH |
1049 | */ |
1050 | static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, | |
5d952b83 | 1051 | struct exofs_fcb *inode) |
e6af00f1 BH |
1052 | { |
1053 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
d9c740d2 BH |
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, | |
d9c740d2 | 1058 | }; |
8ff660ab | 1059 | struct ore_io_state *ios; |
d9c740d2 | 1060 | struct exofs_on_disk_inode_layout *layout; |
e6af00f1 BH |
1061 | int ret; |
1062 | ||
5bf696da | 1063 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
06886a5a | 1064 | if (unlikely(ret)) { |
8ff660ab | 1065 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
06886a5a | 1066 | return ret; |
e6af00f1 | 1067 | } |
e6af00f1 | 1068 | |
5bf696da BH |
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); | |
d9c740d2 | 1071 | |
06886a5a BH |
1072 | ios->in_attr = attrs; |
1073 | ios->in_attr_len = ARRAY_SIZE(attrs); | |
e6af00f1 | 1074 | |
8ff660ab | 1075 | ret = ore_read(ios); |
96391e2b BH |
1076 | if (unlikely(ret)) { |
1077 | EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n", | |
9e9db456 | 1078 | _LLU(oi->one_comp.obj.id), ret); |
96391e2b BH |
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; | |
e6af00f1 | 1086 | goto out; |
96391e2b | 1087 | } |
e6af00f1 | 1088 | |
06886a5a | 1089 | ret = extract_attr_from_ios(ios, &attrs[0]); |
e6af00f1 | 1090 | if (ret) { |
06886a5a | 1091 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
e6af00f1 BH |
1092 | goto out; |
1093 | } | |
06886a5a BH |
1094 | WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE); |
1095 | memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE); | |
e6af00f1 | 1096 | |
06886a5a | 1097 | ret = extract_attr_from_ios(ios, &attrs[1]); |
d9c740d2 BH |
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 | ||
e6af00f1 | 1127 | out: |
8ff660ab | 1128 | ore_put_io_state(ios); |
e6af00f1 BH |
1129 | return ret; |
1130 | } | |
1131 | ||
9cfdc7aa BH |
1132 | static void __oi_init(struct exofs_i_info *oi) |
1133 | { | |
1134 | init_waitqueue_head(&oi->i_wq); | |
1135 | oi->i_flags = 0; | |
1136 | } | |
e6af00f1 BH |
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; | |
e6af00f1 BH |
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); | |
9cfdc7aa | 1153 | __oi_init(oi); |
5bf696da | 1154 | exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info, |
9e9db456 | 1155 | exofs_oi_objno(oi)); |
e6af00f1 BH |
1156 | |
1157 | /* read the inode from the osd */ | |
5d952b83 | 1158 | ret = exofs_get_inode(sb, oi, &fcb); |
e6af00f1 BH |
1159 | if (ret) |
1160 | goto bad_inode; | |
1161 | ||
e6af00f1 BH |
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); | |
d001b053 EB |
1166 | i_uid_write(inode, le32_to_cpu(fcb.i_uid)); |
1167 | i_gid_write(inode, le32_to_cpu(fcb.i_gid)); | |
bfe86848 | 1168 | set_nlink(inode, le16_to_cpu(fcb.i_links_count)); |
e6af00f1 BH |
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 | ||
e6af00f1 BH |
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 | ||
66cd6cad | 1197 | inode->i_mapping->backing_dev_info = sb->s_bdi; |
e6af00f1 BH |
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)) { | |
fe2fd9ed | 1234 | EXOFS_DBGMSG("!obj_created\n"); |
e6af00f1 BH |
1235 | BUG_ON(!obj_2bcreated(oi)); |
1236 | wait_event(oi->i_wq, obj_created(oi)); | |
fe2fd9ed | 1237 | EXOFS_DBGMSG("wait_event done\n"); |
e6af00f1 BH |
1238 | } |
1239 | return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; | |
1240 | } | |
1cea312a | 1241 | |
e6af00f1 BH |
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 | */ | |
8ff660ab | 1247 | static void create_done(struct ore_io_state *ios, void *p) |
e6af00f1 BH |
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 | ||
8ff660ab BH |
1254 | ret = ore_check_io(ios, NULL); |
1255 | ore_put_io_state(ios); | |
06886a5a | 1256 | |
e6af00f1 BH |
1257 | atomic_dec(&sbi->s_curr_pending); |
1258 | ||
1259 | if (unlikely(ret)) { | |
571f7f46 | 1260 | EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx", |
9e9db456 BH |
1261 | _LLU(exofs_oi_objno(oi)), |
1262 | _LLU(oi->one_comp.obj.partition)); | |
06886a5a BH |
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); | |
e6af00f1 | 1272 | |
e6af00f1 BH |
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 | */ | |
bef41c26 | 1279 | struct inode *exofs_new_inode(struct inode *dir, umode_t mode) |
e6af00f1 | 1280 | { |
9e9db456 BH |
1281 | struct super_block *sb = dir->i_sb; |
1282 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
e6af00f1 BH |
1283 | struct inode *inode; |
1284 | struct exofs_i_info *oi; | |
8ff660ab | 1285 | struct ore_io_state *ios; |
e6af00f1 BH |
1286 | int ret; |
1287 | ||
e6af00f1 BH |
1288 | inode = new_inode(sb); |
1289 | if (!inode) | |
1290 | return ERR_PTR(-ENOMEM); | |
1291 | ||
1292 | oi = exofs_i(inode); | |
9cfdc7aa | 1293 | __oi_init(oi); |
e6af00f1 | 1294 | |
e6af00f1 BH |
1295 | set_obj_2bcreated(oi); |
1296 | ||
66cd6cad | 1297 | inode->i_mapping->backing_dev_info = sb->s_bdi; |
e00117f1 | 1298 | inode_init_owner(inode, dir, mode); |
e6af00f1 BH |
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 | ||
5bf696da | 1308 | exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info, |
9e9db456 | 1309 | exofs_oi_objno(oi)); |
1cea312a BH |
1310 | exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */ |
1311 | ||
e6af00f1 BH |
1312 | mark_inode_dirty(inode); |
1313 | ||
5bf696da | 1314 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
06886a5a | 1315 | if (unlikely(ret)) { |
8ff660ab | 1316 | EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n"); |
06886a5a | 1317 | return ERR_PTR(ret); |
e6af00f1 BH |
1318 | } |
1319 | ||
06886a5a BH |
1320 | ios->done = create_done; |
1321 | ios->private = inode; | |
9e9db456 | 1322 | |
8ff660ab | 1323 | ret = ore_create(ios); |
e6af00f1 | 1324 | if (ret) { |
8ff660ab | 1325 | ore_put_io_state(ios); |
06886a5a | 1326 | return ERR_PTR(ret); |
e6af00f1 BH |
1327 | } |
1328 | atomic_inc(&sbi->s_curr_pending); | |
1329 | ||
1330 | return inode; | |
1331 | } | |
ba9e5e98 BH |
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 | */ | |
8ff660ab | 1344 | static void updatei_done(struct ore_io_state *ios, void *p) |
ba9e5e98 BH |
1345 | { |
1346 | struct updatei_args *args = p; | |
1347 | ||
8ff660ab | 1348 | ore_put_io_state(ios); |
ba9e5e98 BH |
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; | |
8ff660ab | 1364 | struct ore_io_state *ios; |
ba9e5e98 BH |
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); | |
34ce4e7c | 1371 | if (!args) { |
571f7f46 | 1372 | EXOFS_DBGMSG("Failed kzalloc of args\n"); |
ba9e5e98 | 1373 | return -ENOMEM; |
34ce4e7c | 1374 | } |
ba9e5e98 BH |
1375 | |
1376 | fcb = &args->fcb; | |
1377 | ||
1378 | fcb->i_mode = cpu_to_le16(inode->i_mode); | |
d001b053 EB |
1379 | fcb->i_uid = cpu_to_le32(i_uid_read(inode)); |
1380 | fcb->i_gid = cpu_to_le32(i_gid_read(inode)); | |
ba9e5e98 BH |
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 | ||
5bf696da | 1403 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
06886a5a | 1404 | if (unlikely(ret)) { |
8ff660ab | 1405 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
ba9e5e98 BH |
1406 | goto free_args; |
1407 | } | |
1408 | ||
ba9e5e98 BH |
1409 | attr = g_attr_inode_data; |
1410 | attr.val_ptr = fcb; | |
06886a5a BH |
1411 | ios->out_attr_len = 1; |
1412 | ios->out_attr = &attr; | |
ba9e5e98 | 1413 | |
fe2fd9ed | 1414 | wait_obj_created(oi); |
ba9e5e98 | 1415 | |
06886a5a | 1416 | if (!do_sync) { |
ba9e5e98 | 1417 | args->sbi = sbi; |
06886a5a BH |
1418 | ios->done = updatei_done; |
1419 | ios->private = args; | |
1420 | } | |
ba9e5e98 | 1421 | |
8ff660ab | 1422 | ret = ore_write(ios); |
06886a5a | 1423 | if (!do_sync && !ret) { |
ba9e5e98 BH |
1424 | atomic_inc(&sbi->s_curr_pending); |
1425 | goto out; /* deallocation in updatei_done */ | |
1426 | } | |
1427 | ||
8ff660ab | 1428 | ore_put_io_state(ios); |
ba9e5e98 BH |
1429 | free_args: |
1430 | kfree(args); | |
1431 | out: | |
34ce4e7c BH |
1432 | EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n", |
1433 | inode->i_ino, do_sync, ret); | |
ba9e5e98 BH |
1434 | return ret; |
1435 | } | |
1436 | ||
a9185b41 | 1437 | int exofs_write_inode(struct inode *inode, struct writeback_control *wbc) |
ba9e5e98 | 1438 | { |
97178b7b NP |
1439 | /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */ |
1440 | return exofs_update_inode(inode, 1); | |
ba9e5e98 BH |
1441 | } |
1442 | ||
1443 | /* | |
1444 | * Callback function from exofs_delete_inode() - don't have much cleaning up to | |
1445 | * do. | |
1446 | */ | |
8ff660ab | 1447 | static void delete_done(struct ore_io_state *ios, void *p) |
ba9e5e98 | 1448 | { |
06886a5a BH |
1449 | struct exofs_sb_info *sbi = p; |
1450 | ||
8ff660ab | 1451 | ore_put_io_state(ios); |
06886a5a | 1452 | |
ba9e5e98 BH |
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 | */ | |
4ec70c9b | 1461 | void exofs_evict_inode(struct inode *inode) |
ba9e5e98 BH |
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; | |
8ff660ab | 1466 | struct ore_io_state *ios; |
ba9e5e98 BH |
1467 | int ret; |
1468 | ||
1469 | truncate_inode_pages(&inode->i_data, 0); | |
1470 | ||
2f246fd0 | 1471 | /* TODO: should do better here */ |
4ec70c9b | 1472 | if (inode->i_nlink || is_bad_inode(inode)) |
ba9e5e98 BH |
1473 | goto no_delete; |
1474 | ||
ba9e5e98 | 1475 | inode->i_size = 0; |
dbd5768f | 1476 | clear_inode(inode); |
ba9e5e98 | 1477 | |
fe2fd9ed BH |
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 */ | |
2f246fd0 BH |
1484 | |
1485 | /* Now Remove the OSD objects */ | |
5bf696da | 1486 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
2f246fd0 | 1487 | if (unlikely(ret)) { |
8ff660ab | 1488 | EXOFS_ERR("%s: ore_get_io_state failed\n", __func__); |
2f246fd0 | 1489 | return; |
ba9e5e98 BH |
1490 | } |
1491 | ||
06886a5a BH |
1492 | ios->done = delete_done; |
1493 | ios->private = sbi; | |
9e9db456 | 1494 | |
8ff660ab | 1495 | ret = ore_remove(ios); |
ba9e5e98 | 1496 | if (ret) { |
8ff660ab BH |
1497 | EXOFS_ERR("%s: ore_remove failed\n", __func__); |
1498 | ore_put_io_state(ios); | |
ba9e5e98 BH |
1499 | return; |
1500 | } | |
1501 | atomic_inc(&sbi->s_curr_pending); | |
1502 | ||
1503 | return; | |
1504 | ||
1505 | no_delete: | |
dbd5768f | 1506 | clear_inode(inode); |
ba9e5e98 | 1507 | } |