Commit | Line | Data |
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e8062719 BH |
1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
e8062719 BH |
4 | * Copyright (C) 2008, 2009 |
5 | * Boaz Harrosh <bharrosh@panasas.com> | |
6 | * | |
7 | * Copyrights for code taken from ext2: | |
8 | * Copyright (C) 1992, 1993, 1994, 1995 | |
9 | * Remy Card (card@masi.ibp.fr) | |
10 | * Laboratoire MASI - Institut Blaise Pascal | |
11 | * Universite Pierre et Marie Curie (Paris VI) | |
12 | * from | |
13 | * linux/fs/minix/inode.c | |
14 | * Copyright (C) 1991, 1992 Linus Torvalds | |
15 | * | |
16 | * This file is part of exofs. | |
17 | * | |
18 | * exofs is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation. Since it is based on ext2, and the only | |
21 | * valid version of GPL for the Linux kernel is version 2, the only valid | |
22 | * version of GPL for exofs is version 2. | |
23 | * | |
24 | * exofs is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with exofs; if not, write to the Free Software | |
31 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
32 | */ | |
33 | ||
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 | ||
06886a5a BH |
40 | enum { BIO_MAX_PAGES_KMALLOC = |
41 | (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec), | |
86093aaf BH |
42 | MAX_PAGES_KMALLOC = |
43 | PAGE_SIZE / sizeof(struct page *), | |
06886a5a BH |
44 | }; |
45 | ||
8ff660ab | 46 | unsigned exofs_max_io_pages(struct ore_layout *layout, |
66cd6cad | 47 | unsigned expected_pages) |
48 | { | |
49 | unsigned pages = min_t(unsigned, expected_pages, MAX_PAGES_KMALLOC); | |
50 | ||
51 | /* TODO: easily support bio chaining */ | |
52 | pages = min_t(unsigned, pages, | |
53 | layout->group_width * BIO_MAX_PAGES_KMALLOC); | |
54 | return pages; | |
55 | } | |
56 | ||
beaec07b BH |
57 | struct page_collect { |
58 | struct exofs_sb_info *sbi; | |
beaec07b BH |
59 | struct inode *inode; |
60 | unsigned expected_pages; | |
8ff660ab | 61 | struct ore_io_state *ios; |
beaec07b | 62 | |
86093aaf BH |
63 | struct page **pages; |
64 | unsigned alloc_pages; | |
beaec07b BH |
65 | unsigned nr_pages; |
66 | unsigned long length; | |
67 | loff_t pg_first; /* keep 64bit also in 32-arches */ | |
f17b1f9f BH |
68 | bool read_4_write; /* This means two things: that the read is sync |
69 | * And the pages should not be unlocked. | |
70 | */ | |
beaec07b BH |
71 | }; |
72 | ||
73 | static void _pcol_init(struct page_collect *pcol, unsigned expected_pages, | |
06886a5a | 74 | struct inode *inode) |
beaec07b BH |
75 | { |
76 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
beaec07b BH |
77 | |
78 | pcol->sbi = sbi; | |
beaec07b BH |
79 | pcol->inode = inode; |
80 | pcol->expected_pages = expected_pages; | |
81 | ||
06886a5a | 82 | pcol->ios = NULL; |
86093aaf BH |
83 | pcol->pages = NULL; |
84 | pcol->alloc_pages = 0; | |
beaec07b BH |
85 | pcol->nr_pages = 0; |
86 | pcol->length = 0; | |
87 | pcol->pg_first = -1; | |
f17b1f9f | 88 | pcol->read_4_write = false; |
beaec07b BH |
89 | } |
90 | ||
91 | static void _pcol_reset(struct page_collect *pcol) | |
92 | { | |
93 | pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages); | |
94 | ||
86093aaf BH |
95 | pcol->pages = NULL; |
96 | pcol->alloc_pages = 0; | |
beaec07b BH |
97 | pcol->nr_pages = 0; |
98 | pcol->length = 0; | |
99 | pcol->pg_first = -1; | |
06886a5a | 100 | pcol->ios = NULL; |
beaec07b BH |
101 | |
102 | /* this is probably the end of the loop but in writes | |
103 | * it might not end here. don't be left with nothing | |
104 | */ | |
105 | if (!pcol->expected_pages) | |
86093aaf | 106 | pcol->expected_pages = MAX_PAGES_KMALLOC; |
beaec07b BH |
107 | } |
108 | ||
109 | static int pcol_try_alloc(struct page_collect *pcol) | |
110 | { | |
66cd6cad | 111 | unsigned pages; |
06886a5a | 112 | |
86093aaf | 113 | /* TODO: easily support bio chaining */ |
66cd6cad | 114 | pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages); |
86093aaf | 115 | |
beaec07b | 116 | for (; pages; pages >>= 1) { |
86093aaf BH |
117 | pcol->pages = kmalloc(pages * sizeof(struct page *), |
118 | GFP_KERNEL); | |
119 | if (likely(pcol->pages)) { | |
120 | pcol->alloc_pages = pages; | |
beaec07b | 121 | return 0; |
86093aaf | 122 | } |
beaec07b BH |
123 | } |
124 | ||
86093aaf | 125 | EXOFS_ERR("Failed to kmalloc expected_pages=%u\n", |
beaec07b BH |
126 | pcol->expected_pages); |
127 | return -ENOMEM; | |
128 | } | |
129 | ||
130 | static void pcol_free(struct page_collect *pcol) | |
131 | { | |
86093aaf BH |
132 | kfree(pcol->pages); |
133 | pcol->pages = NULL; | |
06886a5a BH |
134 | |
135 | if (pcol->ios) { | |
8ff660ab | 136 | ore_put_io_state(pcol->ios); |
06886a5a BH |
137 | pcol->ios = NULL; |
138 | } | |
beaec07b BH |
139 | } |
140 | ||
141 | static int pcol_add_page(struct page_collect *pcol, struct page *page, | |
142 | unsigned len) | |
143 | { | |
86093aaf | 144 | if (unlikely(pcol->nr_pages >= pcol->alloc_pages)) |
beaec07b BH |
145 | return -ENOMEM; |
146 | ||
86093aaf | 147 | pcol->pages[pcol->nr_pages++] = page; |
beaec07b BH |
148 | pcol->length += len; |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int update_read_page(struct page *page, int ret) | |
153 | { | |
154 | if (ret == 0) { | |
155 | /* Everything is OK */ | |
156 | SetPageUptodate(page); | |
157 | if (PageError(page)) | |
158 | ClearPageError(page); | |
159 | } else if (ret == -EFAULT) { | |
160 | /* In this case we were trying to read something that wasn't on | |
161 | * disk yet - return a page full of zeroes. This should be OK, | |
162 | * because the object should be empty (if there was a write | |
163 | * before this read, the read would be waiting with the page | |
164 | * locked */ | |
165 | clear_highpage(page); | |
166 | ||
167 | SetPageUptodate(page); | |
168 | if (PageError(page)) | |
169 | ClearPageError(page); | |
170 | ret = 0; /* recovered error */ | |
171 | EXOFS_DBGMSG("recovered read error\n"); | |
172 | } else /* Error */ | |
173 | SetPageError(page); | |
174 | ||
175 | return ret; | |
176 | } | |
177 | ||
178 | static void update_write_page(struct page *page, int ret) | |
179 | { | |
180 | if (ret) { | |
181 | mapping_set_error(page->mapping, ret); | |
182 | SetPageError(page); | |
183 | } | |
184 | end_page_writeback(page); | |
185 | } | |
186 | ||
187 | /* Called at the end of reads, to optionally unlock pages and update their | |
188 | * status. | |
189 | */ | |
7aebf410 | 190 | static int __readpages_done(struct page_collect *pcol) |
beaec07b | 191 | { |
beaec07b BH |
192 | int i; |
193 | u64 resid; | |
194 | u64 good_bytes; | |
195 | u64 length = 0; | |
8ff660ab | 196 | int ret = ore_check_io(pcol->ios, &resid); |
beaec07b BH |
197 | |
198 | if (likely(!ret)) | |
199 | good_bytes = pcol->length; | |
beaec07b BH |
200 | else |
201 | good_bytes = pcol->length - resid; | |
202 | ||
34ce4e7c | 203 | EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
204 | " length=0x%lx nr_pages=%u\n", |
205 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
206 | pcol->nr_pages); | |
207 | ||
86093aaf BH |
208 | for (i = 0; i < pcol->nr_pages; i++) { |
209 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
210 | struct inode *inode = page->mapping->host; |
211 | int page_stat; | |
212 | ||
213 | if (inode != pcol->inode) | |
214 | continue; /* osd might add more pages at end */ | |
215 | ||
216 | if (likely(length < good_bytes)) | |
217 | page_stat = 0; | |
218 | else | |
219 | page_stat = ret; | |
220 | ||
fe33cc1e | 221 | EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n", |
beaec07b BH |
222 | inode->i_ino, page->index, |
223 | page_stat ? "bad_bytes" : "good_bytes"); | |
224 | ||
225 | ret = update_read_page(page, page_stat); | |
7aebf410 | 226 | if (!pcol->read_4_write) |
beaec07b | 227 | unlock_page(page); |
86093aaf | 228 | length += PAGE_SIZE; |
beaec07b BH |
229 | } |
230 | ||
231 | pcol_free(pcol); | |
34ce4e7c | 232 | EXOFS_DBGMSG2("readpages_done END\n"); |
beaec07b BH |
233 | return ret; |
234 | } | |
235 | ||
236 | /* callback of async reads */ | |
8ff660ab | 237 | static void readpages_done(struct ore_io_state *ios, void *p) |
beaec07b BH |
238 | { |
239 | struct page_collect *pcol = p; | |
240 | ||
7aebf410 | 241 | __readpages_done(pcol); |
beaec07b | 242 | atomic_dec(&pcol->sbi->s_curr_pending); |
06886a5a | 243 | kfree(pcol); |
beaec07b BH |
244 | } |
245 | ||
246 | static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) | |
247 | { | |
beaec07b BH |
248 | int i; |
249 | ||
86093aaf BH |
250 | for (i = 0; i < pcol->nr_pages; i++) { |
251 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
252 | |
253 | if (rw == READ) | |
254 | update_read_page(page, ret); | |
255 | else | |
256 | update_write_page(page, ret); | |
257 | ||
258 | unlock_page(page); | |
259 | } | |
beaec07b BH |
260 | } |
261 | ||
7aebf410 | 262 | static int read_exec(struct page_collect *pcol) |
beaec07b BH |
263 | { |
264 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
8ff660ab | 265 | struct ore_io_state *ios; |
beaec07b | 266 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
267 | int ret; |
268 | ||
86093aaf | 269 | if (!pcol->pages) |
beaec07b BH |
270 | return 0; |
271 | ||
e1042ba0 | 272 | if (!pcol->ios) { |
5bf696da | 273 | int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true, |
e1042ba0 BH |
274 | pcol->pg_first << PAGE_CACHE_SHIFT, |
275 | pcol->length, &pcol->ios); | |
276 | ||
277 | if (ret) | |
278 | return ret; | |
279 | } | |
280 | ||
281 | ios = pcol->ios; | |
86093aaf BH |
282 | ios->pages = pcol->pages; |
283 | ios->nr_pages = pcol->nr_pages; | |
beaec07b | 284 | |
7aebf410 | 285 | if (pcol->read_4_write) { |
8ff660ab | 286 | ore_read(pcol->ios); |
7aebf410 | 287 | return __readpages_done(pcol); |
beaec07b BH |
288 | } |
289 | ||
290 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); | |
291 | if (!pcol_copy) { | |
292 | ret = -ENOMEM; | |
293 | goto err; | |
294 | } | |
295 | ||
296 | *pcol_copy = *pcol; | |
06886a5a BH |
297 | ios->done = readpages_done; |
298 | ios->private = pcol_copy; | |
8ff660ab | 299 | ret = ore_read(ios); |
beaec07b BH |
300 | if (unlikely(ret)) |
301 | goto err; | |
302 | ||
303 | atomic_inc(&pcol->sbi->s_curr_pending); | |
304 | ||
34ce4e7c | 305 | EXOFS_DBGMSG2("read_exec obj=0x%llx start=0x%llx length=0x%lx\n", |
9e9db456 | 306 | oi->one_comp.obj.id, _LLU(ios->offset), pcol->length); |
beaec07b BH |
307 | |
308 | /* pages ownership was passed to pcol_copy */ | |
309 | _pcol_reset(pcol); | |
310 | return 0; | |
311 | ||
312 | err: | |
7aebf410 | 313 | if (!pcol->read_4_write) |
beaec07b | 314 | _unlock_pcol_pages(pcol, ret, READ); |
06886a5a BH |
315 | |
316 | pcol_free(pcol); | |
b76a3f93 | 317 | |
beaec07b | 318 | kfree(pcol_copy); |
beaec07b BH |
319 | return ret; |
320 | } | |
321 | ||
322 | /* readpage_strip is called either directly from readpage() or by the VFS from | |
323 | * within read_cache_pages(), to add one more page to be read. It will try to | |
324 | * collect as many contiguous pages as posible. If a discontinuity is | |
325 | * encountered, or it runs out of resources, it will submit the previous segment | |
326 | * and will start a new collection. Eventually caller must submit the last | |
327 | * segment if present. | |
328 | */ | |
329 | static int readpage_strip(void *data, struct page *page) | |
330 | { | |
331 | struct page_collect *pcol = data; | |
332 | struct inode *inode = pcol->inode; | |
333 | struct exofs_i_info *oi = exofs_i(inode); | |
334 | loff_t i_size = i_size_read(inode); | |
335 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
336 | size_t len; | |
337 | int ret; | |
338 | ||
339 | /* FIXME: Just for debugging, will be removed */ | |
340 | if (PageUptodate(page)) | |
341 | EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino, | |
342 | page->index); | |
343 | ||
344 | if (page->index < end_index) | |
345 | len = PAGE_CACHE_SIZE; | |
346 | else if (page->index == end_index) | |
347 | len = i_size & ~PAGE_CACHE_MASK; | |
348 | else | |
349 | len = 0; | |
350 | ||
351 | if (!len || !obj_created(oi)) { | |
352 | /* this will be out of bounds, or doesn't exist yet. | |
353 | * Current page is cleared and the request is split | |
354 | */ | |
355 | clear_highpage(page); | |
356 | ||
357 | SetPageUptodate(page); | |
358 | if (PageError(page)) | |
359 | ClearPageError(page); | |
360 | ||
f17b1f9f BH |
361 | if (!pcol->read_4_write) |
362 | unlock_page(page); | |
a8f1418f BH |
363 | EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx " |
364 | "read_4_write=%d index=0x%lx end_index=0x%lx " | |
365 | "splitting\n", inode->i_ino, len, | |
366 | pcol->read_4_write, page->index, end_index); | |
beaec07b | 367 | |
7aebf410 | 368 | return read_exec(pcol); |
beaec07b BH |
369 | } |
370 | ||
371 | try_again: | |
372 | ||
373 | if (unlikely(pcol->pg_first == -1)) { | |
374 | pcol->pg_first = page->index; | |
375 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
376 | page->index)) { | |
377 | /* Discontinuity detected, split the request */ | |
7aebf410 | 378 | ret = read_exec(pcol); |
beaec07b BH |
379 | if (unlikely(ret)) |
380 | goto fail; | |
381 | goto try_again; | |
382 | } | |
383 | ||
86093aaf | 384 | if (!pcol->pages) { |
beaec07b BH |
385 | ret = pcol_try_alloc(pcol); |
386 | if (unlikely(ret)) | |
387 | goto fail; | |
388 | } | |
389 | ||
390 | if (len != PAGE_CACHE_SIZE) | |
391 | zero_user(page, len, PAGE_CACHE_SIZE - len); | |
392 | ||
fe33cc1e | 393 | EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
394 | inode->i_ino, page->index, len); |
395 | ||
396 | ret = pcol_add_page(pcol, page, len); | |
397 | if (ret) { | |
fe33cc1e | 398 | EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p " |
beaec07b BH |
399 | "this_len=0x%zx nr_pages=%u length=0x%lx\n", |
400 | page, len, pcol->nr_pages, pcol->length); | |
401 | ||
402 | /* split the request, and start again with current page */ | |
7aebf410 | 403 | ret = read_exec(pcol); |
beaec07b BH |
404 | if (unlikely(ret)) |
405 | goto fail; | |
406 | ||
407 | goto try_again; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | ||
412 | fail: | |
413 | /* SetPageError(page); ??? */ | |
414 | unlock_page(page); | |
415 | return ret; | |
416 | } | |
417 | ||
418 | static int exofs_readpages(struct file *file, struct address_space *mapping, | |
419 | struct list_head *pages, unsigned nr_pages) | |
420 | { | |
421 | struct page_collect pcol; | |
422 | int ret; | |
423 | ||
424 | _pcol_init(&pcol, nr_pages, mapping->host); | |
425 | ||
426 | ret = read_cache_pages(mapping, pages, readpage_strip, &pcol); | |
427 | if (ret) { | |
428 | EXOFS_ERR("read_cache_pages => %d\n", ret); | |
429 | return ret; | |
430 | } | |
431 | ||
7aebf410 | 432 | return read_exec(&pcol); |
beaec07b BH |
433 | } |
434 | ||
7aebf410 | 435 | static int _readpage(struct page *page, bool read_4_write) |
beaec07b BH |
436 | { |
437 | struct page_collect pcol; | |
438 | int ret; | |
439 | ||
440 | _pcol_init(&pcol, 1, page->mapping->host); | |
441 | ||
7aebf410 | 442 | pcol.read_4_write = read_4_write; |
beaec07b BH |
443 | ret = readpage_strip(&pcol, page); |
444 | if (ret) { | |
445 | EXOFS_ERR("_readpage => %d\n", ret); | |
446 | return ret; | |
447 | } | |
448 | ||
7aebf410 | 449 | return read_exec(&pcol); |
beaec07b BH |
450 | } |
451 | ||
452 | /* | |
453 | * We don't need the file | |
454 | */ | |
455 | static int exofs_readpage(struct file *file, struct page *page) | |
456 | { | |
457 | return _readpage(page, false); | |
458 | } | |
459 | ||
06886a5a | 460 | /* Callback for osd_write. All writes are asynchronous */ |
8ff660ab | 461 | static void writepages_done(struct ore_io_state *ios, void *p) |
beaec07b BH |
462 | { |
463 | struct page_collect *pcol = p; | |
beaec07b BH |
464 | int i; |
465 | u64 resid; | |
466 | u64 good_bytes; | |
467 | u64 length = 0; | |
8ff660ab | 468 | int ret = ore_check_io(ios, &resid); |
beaec07b | 469 | |
beaec07b BH |
470 | atomic_dec(&pcol->sbi->s_curr_pending); |
471 | ||
472 | if (likely(!ret)) | |
473 | good_bytes = pcol->length; | |
beaec07b BH |
474 | else |
475 | good_bytes = pcol->length - resid; | |
476 | ||
34ce4e7c | 477 | EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
478 | " length=0x%lx nr_pages=%u\n", |
479 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
480 | pcol->nr_pages); | |
481 | ||
86093aaf BH |
482 | for (i = 0; i < pcol->nr_pages; i++) { |
483 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
484 | struct inode *inode = page->mapping->host; |
485 | int page_stat; | |
486 | ||
487 | if (inode != pcol->inode) | |
488 | continue; /* osd might add more pages to a bio */ | |
489 | ||
490 | if (likely(length < good_bytes)) | |
491 | page_stat = 0; | |
492 | else | |
493 | page_stat = ret; | |
494 | ||
495 | update_write_page(page, page_stat); | |
496 | unlock_page(page); | |
fe33cc1e | 497 | EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n", |
beaec07b BH |
498 | inode->i_ino, page->index, page_stat); |
499 | ||
86093aaf | 500 | length += PAGE_SIZE; |
beaec07b BH |
501 | } |
502 | ||
503 | pcol_free(pcol); | |
504 | kfree(pcol); | |
34ce4e7c | 505 | EXOFS_DBGMSG2("writepages_done END\n"); |
beaec07b BH |
506 | } |
507 | ||
508 | static int write_exec(struct page_collect *pcol) | |
509 | { | |
510 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
8ff660ab | 511 | struct ore_io_state *ios; |
beaec07b | 512 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
513 | int ret; |
514 | ||
86093aaf | 515 | if (!pcol->pages) |
beaec07b BH |
516 | return 0; |
517 | ||
e1042ba0 | 518 | BUG_ON(pcol->ios); |
5bf696da | 519 | ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false, |
e1042ba0 BH |
520 | pcol->pg_first << PAGE_CACHE_SHIFT, |
521 | pcol->length, &pcol->ios); | |
522 | ||
523 | if (unlikely(ret)) | |
524 | goto err; | |
525 | ||
beaec07b BH |
526 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
527 | if (!pcol_copy) { | |
571f7f46 | 528 | EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n"); |
beaec07b BH |
529 | ret = -ENOMEM; |
530 | goto err; | |
531 | } | |
532 | ||
533 | *pcol_copy = *pcol; | |
534 | ||
e1042ba0 | 535 | ios = pcol->ios; |
86093aaf BH |
536 | ios->pages = pcol_copy->pages; |
537 | ios->nr_pages = pcol_copy->nr_pages; | |
06886a5a BH |
538 | ios->done = writepages_done; |
539 | ios->private = pcol_copy; | |
540 | ||
8ff660ab | 541 | ret = ore_write(ios); |
beaec07b | 542 | if (unlikely(ret)) { |
8ff660ab | 543 | EXOFS_ERR("write_exec: ore_write() Failed\n"); |
beaec07b BH |
544 | goto err; |
545 | } | |
546 | ||
547 | atomic_inc(&pcol->sbi->s_curr_pending); | |
34ce4e7c | 548 | EXOFS_DBGMSG2("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n", |
06886a5a | 549 | pcol->inode->i_ino, pcol->pg_first, _LLU(ios->offset), |
beaec07b BH |
550 | pcol->length); |
551 | /* pages ownership was passed to pcol_copy */ | |
552 | _pcol_reset(pcol); | |
553 | return 0; | |
554 | ||
555 | err: | |
556 | _unlock_pcol_pages(pcol, ret, WRITE); | |
06886a5a | 557 | pcol_free(pcol); |
beaec07b | 558 | kfree(pcol_copy); |
06886a5a | 559 | |
beaec07b BH |
560 | return ret; |
561 | } | |
562 | ||
563 | /* writepage_strip is called either directly from writepage() or by the VFS from | |
564 | * within write_cache_pages(), to add one more page to be written to storage. | |
565 | * It will try to collect as many contiguous pages as possible. If a | |
566 | * discontinuity is encountered or it runs out of resources it will submit the | |
567 | * previous segment and will start a new collection. | |
568 | * Eventually caller must submit the last segment if present. | |
569 | */ | |
570 | static int writepage_strip(struct page *page, | |
571 | struct writeback_control *wbc_unused, void *data) | |
572 | { | |
573 | struct page_collect *pcol = data; | |
574 | struct inode *inode = pcol->inode; | |
575 | struct exofs_i_info *oi = exofs_i(inode); | |
576 | loff_t i_size = i_size_read(inode); | |
577 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
578 | size_t len; | |
579 | int ret; | |
580 | ||
581 | BUG_ON(!PageLocked(page)); | |
582 | ||
583 | ret = wait_obj_created(oi); | |
584 | if (unlikely(ret)) | |
585 | goto fail; | |
586 | ||
587 | if (page->index < end_index) | |
588 | /* in this case, the page is within the limits of the file */ | |
589 | len = PAGE_CACHE_SIZE; | |
590 | else { | |
591 | len = i_size & ~PAGE_CACHE_MASK; | |
592 | ||
593 | if (page->index > end_index || !len) { | |
594 | /* in this case, the page is outside the limits | |
595 | * (truncate in progress) | |
596 | */ | |
597 | ret = write_exec(pcol); | |
598 | if (unlikely(ret)) | |
599 | goto fail; | |
600 | if (PageError(page)) | |
601 | ClearPageError(page); | |
602 | unlock_page(page); | |
06886a5a BH |
603 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) " |
604 | "outside the limits\n", | |
605 | inode->i_ino, page->index); | |
beaec07b BH |
606 | return 0; |
607 | } | |
608 | } | |
609 | ||
610 | try_again: | |
611 | ||
612 | if (unlikely(pcol->pg_first == -1)) { | |
613 | pcol->pg_first = page->index; | |
614 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
615 | page->index)) { | |
616 | /* Discontinuity detected, split the request */ | |
617 | ret = write_exec(pcol); | |
618 | if (unlikely(ret)) | |
619 | goto fail; | |
06886a5a BH |
620 | |
621 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n", | |
622 | inode->i_ino, page->index); | |
beaec07b BH |
623 | goto try_again; |
624 | } | |
625 | ||
86093aaf | 626 | if (!pcol->pages) { |
beaec07b BH |
627 | ret = pcol_try_alloc(pcol); |
628 | if (unlikely(ret)) | |
629 | goto fail; | |
630 | } | |
631 | ||
fe33cc1e | 632 | EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
633 | inode->i_ino, page->index, len); |
634 | ||
635 | ret = pcol_add_page(pcol, page, len); | |
636 | if (unlikely(ret)) { | |
34ce4e7c | 637 | EXOFS_DBGMSG2("Failed pcol_add_page " |
beaec07b BH |
638 | "nr_pages=%u total_length=0x%lx\n", |
639 | pcol->nr_pages, pcol->length); | |
640 | ||
641 | /* split the request, next loop will start again */ | |
642 | ret = write_exec(pcol); | |
643 | if (unlikely(ret)) { | |
571f7f46 | 644 | EXOFS_DBGMSG("write_exec failed => %d", ret); |
beaec07b BH |
645 | goto fail; |
646 | } | |
647 | ||
648 | goto try_again; | |
649 | } | |
650 | ||
651 | BUG_ON(PageWriteback(page)); | |
652 | set_page_writeback(page); | |
653 | ||
654 | return 0; | |
655 | ||
656 | fail: | |
06886a5a BH |
657 | EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n", |
658 | inode->i_ino, page->index, ret); | |
beaec07b BH |
659 | set_bit(AS_EIO, &page->mapping->flags); |
660 | unlock_page(page); | |
661 | return ret; | |
662 | } | |
663 | ||
664 | static int exofs_writepages(struct address_space *mapping, | |
665 | struct writeback_control *wbc) | |
666 | { | |
667 | struct page_collect pcol; | |
668 | long start, end, expected_pages; | |
669 | int ret; | |
670 | ||
671 | start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
672 | end = (wbc->range_end == LLONG_MAX) ? | |
673 | start + mapping->nrpages : | |
674 | wbc->range_end >> PAGE_CACHE_SHIFT; | |
675 | ||
676 | if (start || end) | |
06886a5a | 677 | expected_pages = end - start + 1; |
beaec07b BH |
678 | else |
679 | expected_pages = mapping->nrpages; | |
680 | ||
06886a5a BH |
681 | if (expected_pages < 32L) |
682 | expected_pages = 32L; | |
683 | ||
34ce4e7c | 684 | EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx " |
06886a5a | 685 | "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n", |
beaec07b | 686 | mapping->host->i_ino, wbc->range_start, wbc->range_end, |
06886a5a | 687 | mapping->nrpages, start, end, expected_pages); |
beaec07b BH |
688 | |
689 | _pcol_init(&pcol, expected_pages, mapping->host); | |
690 | ||
691 | ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); | |
692 | if (ret) { | |
693 | EXOFS_ERR("write_cache_pages => %d\n", ret); | |
694 | return ret; | |
695 | } | |
696 | ||
697 | return write_exec(&pcol); | |
698 | } | |
699 | ||
700 | static int exofs_writepage(struct page *page, struct writeback_control *wbc) | |
701 | { | |
702 | struct page_collect pcol; | |
703 | int ret; | |
704 | ||
705 | _pcol_init(&pcol, 1, page->mapping->host); | |
706 | ||
707 | ret = writepage_strip(page, NULL, &pcol); | |
708 | if (ret) { | |
709 | EXOFS_ERR("exofs_writepage => %d\n", ret); | |
710 | return ret; | |
711 | } | |
712 | ||
713 | return write_exec(&pcol); | |
714 | } | |
715 | ||
2f246fd0 BH |
716 | /* i_mutex held using inode->i_size directly */ |
717 | static void _write_failed(struct inode *inode, loff_t to) | |
718 | { | |
719 | if (to > inode->i_size) | |
720 | truncate_pagecache(inode, to, inode->i_size); | |
721 | } | |
722 | ||
beaec07b BH |
723 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
724 | loff_t pos, unsigned len, unsigned flags, | |
725 | struct page **pagep, void **fsdata) | |
726 | { | |
727 | int ret = 0; | |
728 | struct page *page; | |
729 | ||
730 | page = *pagep; | |
731 | if (page == NULL) { | |
732 | ret = simple_write_begin(file, mapping, pos, len, flags, pagep, | |
733 | fsdata); | |
734 | if (ret) { | |
571f7f46 | 735 | EXOFS_DBGMSG("simple_write_begin failed\n"); |
2f246fd0 | 736 | goto out; |
beaec07b BH |
737 | } |
738 | ||
739 | page = *pagep; | |
740 | } | |
741 | ||
742 | /* read modify write */ | |
743 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { | |
a8f1418f BH |
744 | loff_t i_size = i_size_read(mapping->host); |
745 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
746 | size_t rlen; | |
747 | ||
748 | if (page->index < end_index) | |
749 | rlen = PAGE_CACHE_SIZE; | |
750 | else if (page->index == end_index) | |
751 | rlen = i_size & ~PAGE_CACHE_MASK; | |
752 | else | |
753 | rlen = 0; | |
754 | ||
755 | if (!rlen) { | |
756 | clear_highpage(page); | |
757 | SetPageUptodate(page); | |
758 | goto out; | |
759 | } | |
760 | ||
beaec07b BH |
761 | ret = _readpage(page, true); |
762 | if (ret) { | |
763 | /*SetPageError was done by _readpage. Is it ok?*/ | |
764 | unlock_page(page); | |
a8f1418f | 765 | EXOFS_DBGMSG("__readpage failed\n"); |
beaec07b BH |
766 | } |
767 | } | |
2f246fd0 BH |
768 | out: |
769 | if (unlikely(ret)) | |
770 | _write_failed(mapping->host, pos + len); | |
beaec07b BH |
771 | |
772 | return ret; | |
773 | } | |
774 | ||
775 | static int exofs_write_begin_export(struct file *file, | |
776 | struct address_space *mapping, | |
777 | loff_t pos, unsigned len, unsigned flags, | |
778 | struct page **pagep, void **fsdata) | |
779 | { | |
780 | *pagep = NULL; | |
781 | ||
782 | return exofs_write_begin(file, mapping, pos, len, flags, pagep, | |
783 | fsdata); | |
784 | } | |
785 | ||
efd124b9 BH |
786 | static int exofs_write_end(struct file *file, struct address_space *mapping, |
787 | loff_t pos, unsigned len, unsigned copied, | |
788 | struct page *page, void *fsdata) | |
789 | { | |
790 | struct inode *inode = mapping->host; | |
791 | /* According to comment in simple_write_end i_mutex is held */ | |
792 | loff_t i_size = inode->i_size; | |
793 | int ret; | |
794 | ||
795 | ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata); | |
2f246fd0 BH |
796 | if (unlikely(ret)) |
797 | _write_failed(inode, pos + len); | |
798 | ||
799 | /* TODO: once simple_write_end marks inode dirty remove */ | |
efd124b9 BH |
800 | if (i_size != inode->i_size) |
801 | mark_inode_dirty(inode); | |
802 | return ret; | |
803 | } | |
804 | ||
200b0700 BH |
805 | static int exofs_releasepage(struct page *page, gfp_t gfp) |
806 | { | |
807 | EXOFS_DBGMSG("page 0x%lx\n", page->index); | |
808 | WARN_ON(1); | |
85dc7878 | 809 | return 0; |
200b0700 BH |
810 | } |
811 | ||
812 | static void exofs_invalidatepage(struct page *page, unsigned long offset) | |
813 | { | |
85dc7878 | 814 | EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset); |
200b0700 | 815 | WARN_ON(1); |
200b0700 BH |
816 | } |
817 | ||
beaec07b BH |
818 | const struct address_space_operations exofs_aops = { |
819 | .readpage = exofs_readpage, | |
820 | .readpages = exofs_readpages, | |
821 | .writepage = exofs_writepage, | |
822 | .writepages = exofs_writepages, | |
823 | .write_begin = exofs_write_begin_export, | |
efd124b9 | 824 | .write_end = exofs_write_end, |
200b0700 BH |
825 | .releasepage = exofs_releasepage, |
826 | .set_page_dirty = __set_page_dirty_nobuffers, | |
827 | .invalidatepage = exofs_invalidatepage, | |
828 | ||
829 | /* Not implemented Yet */ | |
830 | .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */ | |
831 | .direct_IO = NULL, /* TODO: Should be trivial to do */ | |
832 | ||
833 | /* With these NULL has special meaning or default is not exported */ | |
200b0700 BH |
834 | .get_xip_mem = NULL, |
835 | .migratepage = NULL, | |
836 | .launder_page = NULL, | |
837 | .is_partially_uptodate = NULL, | |
838 | .error_remove_page = NULL, | |
beaec07b BH |
839 | }; |
840 | ||
e8062719 BH |
841 | /****************************************************************************** |
842 | * INODE OPERATIONS | |
843 | *****************************************************************************/ | |
844 | ||
845 | /* | |
846 | * Test whether an inode is a fast symlink. | |
847 | */ | |
848 | static inline int exofs_inode_is_fast_symlink(struct inode *inode) | |
849 | { | |
850 | struct exofs_i_info *oi = exofs_i(inode); | |
851 | ||
852 | return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); | |
853 | } | |
854 | ||
2f246fd0 | 855 | static int _do_truncate(struct inode *inode, loff_t newsize) |
06886a5a BH |
856 | { |
857 | struct exofs_i_info *oi = exofs_i(inode); | |
9e9db456 | 858 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; |
06886a5a BH |
859 | int ret; |
860 | ||
861 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
862 | ||
5bf696da | 863 | ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize); |
2f246fd0 BH |
864 | if (likely(!ret)) |
865 | truncate_setsize(inode, newsize); | |
06886a5a | 866 | |
2f246fd0 BH |
867 | EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n", |
868 | inode->i_ino, newsize, ret); | |
06886a5a BH |
869 | return ret; |
870 | } | |
871 | ||
e8062719 | 872 | /* |
2f246fd0 BH |
873 | * Set inode attributes - update size attribute on OSD if needed, |
874 | * otherwise just call generic functions. | |
e8062719 BH |
875 | */ |
876 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) | |
877 | { | |
878 | struct inode *inode = dentry->d_inode; | |
879 | int error; | |
880 | ||
2f246fd0 BH |
881 | /* if we are about to modify an object, and it hasn't been |
882 | * created yet, wait | |
883 | */ | |
884 | error = wait_obj_created(exofs_i(inode)); | |
885 | if (unlikely(error)) | |
886 | return error; | |
887 | ||
e8062719 | 888 | error = inode_change_ok(inode, iattr); |
2f246fd0 | 889 | if (unlikely(error)) |
e8062719 BH |
890 | return error; |
891 | ||
1025774c CH |
892 | if ((iattr->ia_valid & ATTR_SIZE) && |
893 | iattr->ia_size != i_size_read(inode)) { | |
2f246fd0 BH |
894 | error = _do_truncate(inode, iattr->ia_size); |
895 | if (unlikely(error)) | |
1025774c CH |
896 | return error; |
897 | } | |
898 | ||
899 | setattr_copy(inode, iattr); | |
900 | mark_inode_dirty(inode); | |
901 | return 0; | |
e8062719 | 902 | } |
e6af00f1 | 903 | |
d9c740d2 BH |
904 | static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF( |
905 | EXOFS_APAGE_FS_DATA, | |
906 | EXOFS_ATTR_INODE_FILE_LAYOUT, | |
907 | 0); | |
908 | static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF( | |
909 | EXOFS_APAGE_FS_DATA, | |
910 | EXOFS_ATTR_INODE_DIR_LAYOUT, | |
911 | 0); | |
912 | ||
e6af00f1 | 913 | /* |
5d952b83 BH |
914 | * Read the Linux inode info from the OSD, and return it as is. In exofs the |
915 | * inode info is in an application specific page/attribute of the osd-object. | |
e6af00f1 BH |
916 | */ |
917 | static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, | |
5d952b83 | 918 | struct exofs_fcb *inode) |
e6af00f1 BH |
919 | { |
920 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
d9c740d2 BH |
921 | struct osd_attr attrs[] = { |
922 | [0] = g_attr_inode_data, | |
923 | [1] = g_attr_inode_file_layout, | |
924 | [2] = g_attr_inode_dir_layout, | |
d9c740d2 | 925 | }; |
8ff660ab | 926 | struct ore_io_state *ios; |
d9c740d2 | 927 | struct exofs_on_disk_inode_layout *layout; |
e6af00f1 BH |
928 | int ret; |
929 | ||
5bf696da | 930 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
06886a5a | 931 | if (unlikely(ret)) { |
8ff660ab | 932 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
06886a5a | 933 | return ret; |
e6af00f1 | 934 | } |
e6af00f1 | 935 | |
5bf696da BH |
936 | attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs); |
937 | attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs); | |
d9c740d2 | 938 | |
06886a5a BH |
939 | ios->in_attr = attrs; |
940 | ios->in_attr_len = ARRAY_SIZE(attrs); | |
e6af00f1 | 941 | |
8ff660ab | 942 | ret = ore_read(ios); |
96391e2b BH |
943 | if (unlikely(ret)) { |
944 | EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n", | |
9e9db456 | 945 | _LLU(oi->one_comp.obj.id), ret); |
96391e2b BH |
946 | memset(inode, 0, sizeof(*inode)); |
947 | inode->i_mode = 0040000 | (0777 & ~022); | |
948 | /* If object is lost on target we might as well enable it's | |
949 | * delete. | |
950 | */ | |
951 | if ((ret == -ENOENT) || (ret == -EINVAL)) | |
952 | ret = 0; | |
e6af00f1 | 953 | goto out; |
96391e2b | 954 | } |
e6af00f1 | 955 | |
06886a5a | 956 | ret = extract_attr_from_ios(ios, &attrs[0]); |
e6af00f1 | 957 | if (ret) { |
06886a5a | 958 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
e6af00f1 BH |
959 | goto out; |
960 | } | |
06886a5a BH |
961 | WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE); |
962 | memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE); | |
e6af00f1 | 963 | |
06886a5a | 964 | ret = extract_attr_from_ios(ios, &attrs[1]); |
d9c740d2 BH |
965 | if (ret) { |
966 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
967 | goto out; | |
968 | } | |
969 | if (attrs[1].len) { | |
970 | layout = attrs[1].val_ptr; | |
971 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
972 | EXOFS_ERR("%s: unsupported files layout %d\n", | |
973 | __func__, layout->gen_func); | |
974 | ret = -ENOTSUPP; | |
975 | goto out; | |
976 | } | |
977 | } | |
978 | ||
979 | ret = extract_attr_from_ios(ios, &attrs[2]); | |
980 | if (ret) { | |
981 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
982 | goto out; | |
983 | } | |
984 | if (attrs[2].len) { | |
985 | layout = attrs[2].val_ptr; | |
986 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
987 | EXOFS_ERR("%s: unsupported meta-data layout %d\n", | |
988 | __func__, layout->gen_func); | |
989 | ret = -ENOTSUPP; | |
990 | goto out; | |
991 | } | |
992 | } | |
993 | ||
e6af00f1 | 994 | out: |
8ff660ab | 995 | ore_put_io_state(ios); |
e6af00f1 BH |
996 | return ret; |
997 | } | |
998 | ||
9cfdc7aa BH |
999 | static void __oi_init(struct exofs_i_info *oi) |
1000 | { | |
1001 | init_waitqueue_head(&oi->i_wq); | |
1002 | oi->i_flags = 0; | |
1003 | } | |
e6af00f1 BH |
1004 | /* |
1005 | * Fill in an inode read from the OSD and set it up for use | |
1006 | */ | |
1007 | struct inode *exofs_iget(struct super_block *sb, unsigned long ino) | |
1008 | { | |
1009 | struct exofs_i_info *oi; | |
1010 | struct exofs_fcb fcb; | |
1011 | struct inode *inode; | |
e6af00f1 BH |
1012 | int ret; |
1013 | ||
1014 | inode = iget_locked(sb, ino); | |
1015 | if (!inode) | |
1016 | return ERR_PTR(-ENOMEM); | |
1017 | if (!(inode->i_state & I_NEW)) | |
1018 | return inode; | |
1019 | oi = exofs_i(inode); | |
9cfdc7aa | 1020 | __oi_init(oi); |
5bf696da | 1021 | exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info, |
9e9db456 | 1022 | exofs_oi_objno(oi)); |
e6af00f1 BH |
1023 | |
1024 | /* read the inode from the osd */ | |
5d952b83 | 1025 | ret = exofs_get_inode(sb, oi, &fcb); |
e6af00f1 BH |
1026 | if (ret) |
1027 | goto bad_inode; | |
1028 | ||
e6af00f1 BH |
1029 | set_obj_created(oi); |
1030 | ||
1031 | /* copy stuff from on-disk struct to in-memory struct */ | |
1032 | inode->i_mode = le16_to_cpu(fcb.i_mode); | |
1033 | inode->i_uid = le32_to_cpu(fcb.i_uid); | |
1034 | inode->i_gid = le32_to_cpu(fcb.i_gid); | |
1035 | inode->i_nlink = le16_to_cpu(fcb.i_links_count); | |
1036 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime); | |
1037 | inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime); | |
1038 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime); | |
1039 | inode->i_ctime.tv_nsec = | |
1040 | inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0; | |
1041 | oi->i_commit_size = le64_to_cpu(fcb.i_size); | |
1042 | i_size_write(inode, oi->i_commit_size); | |
1043 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1044 | inode->i_generation = le32_to_cpu(fcb.i_generation); | |
1045 | ||
e6af00f1 BH |
1046 | oi->i_dir_start_lookup = 0; |
1047 | ||
1048 | if ((inode->i_nlink == 0) && (inode->i_mode == 0)) { | |
1049 | ret = -ESTALE; | |
1050 | goto bad_inode; | |
1051 | } | |
1052 | ||
1053 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1054 | if (fcb.i_data[0]) | |
1055 | inode->i_rdev = | |
1056 | old_decode_dev(le32_to_cpu(fcb.i_data[0])); | |
1057 | else | |
1058 | inode->i_rdev = | |
1059 | new_decode_dev(le32_to_cpu(fcb.i_data[1])); | |
1060 | } else { | |
1061 | memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); | |
1062 | } | |
1063 | ||
66cd6cad | 1064 | inode->i_mapping->backing_dev_info = sb->s_bdi; |
e6af00f1 BH |
1065 | if (S_ISREG(inode->i_mode)) { |
1066 | inode->i_op = &exofs_file_inode_operations; | |
1067 | inode->i_fop = &exofs_file_operations; | |
1068 | inode->i_mapping->a_ops = &exofs_aops; | |
1069 | } else if (S_ISDIR(inode->i_mode)) { | |
1070 | inode->i_op = &exofs_dir_inode_operations; | |
1071 | inode->i_fop = &exofs_dir_operations; | |
1072 | inode->i_mapping->a_ops = &exofs_aops; | |
1073 | } else if (S_ISLNK(inode->i_mode)) { | |
1074 | if (exofs_inode_is_fast_symlink(inode)) | |
1075 | inode->i_op = &exofs_fast_symlink_inode_operations; | |
1076 | else { | |
1077 | inode->i_op = &exofs_symlink_inode_operations; | |
1078 | inode->i_mapping->a_ops = &exofs_aops; | |
1079 | } | |
1080 | } else { | |
1081 | inode->i_op = &exofs_special_inode_operations; | |
1082 | if (fcb.i_data[0]) | |
1083 | init_special_inode(inode, inode->i_mode, | |
1084 | old_decode_dev(le32_to_cpu(fcb.i_data[0]))); | |
1085 | else | |
1086 | init_special_inode(inode, inode->i_mode, | |
1087 | new_decode_dev(le32_to_cpu(fcb.i_data[1]))); | |
1088 | } | |
1089 | ||
1090 | unlock_new_inode(inode); | |
1091 | return inode; | |
1092 | ||
1093 | bad_inode: | |
1094 | iget_failed(inode); | |
1095 | return ERR_PTR(ret); | |
1096 | } | |
1097 | ||
1098 | int __exofs_wait_obj_created(struct exofs_i_info *oi) | |
1099 | { | |
1100 | if (!obj_created(oi)) { | |
fe2fd9ed | 1101 | EXOFS_DBGMSG("!obj_created\n"); |
e6af00f1 BH |
1102 | BUG_ON(!obj_2bcreated(oi)); |
1103 | wait_event(oi->i_wq, obj_created(oi)); | |
fe2fd9ed | 1104 | EXOFS_DBGMSG("wait_event done\n"); |
e6af00f1 BH |
1105 | } |
1106 | return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; | |
1107 | } | |
1cea312a | 1108 | |
e6af00f1 BH |
1109 | /* |
1110 | * Callback function from exofs_new_inode(). The important thing is that we | |
1111 | * set the obj_created flag so that other methods know that the object exists on | |
1112 | * the OSD. | |
1113 | */ | |
8ff660ab | 1114 | static void create_done(struct ore_io_state *ios, void *p) |
e6af00f1 BH |
1115 | { |
1116 | struct inode *inode = p; | |
1117 | struct exofs_i_info *oi = exofs_i(inode); | |
1118 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
1119 | int ret; | |
1120 | ||
8ff660ab BH |
1121 | ret = ore_check_io(ios, NULL); |
1122 | ore_put_io_state(ios); | |
06886a5a | 1123 | |
e6af00f1 BH |
1124 | atomic_dec(&sbi->s_curr_pending); |
1125 | ||
1126 | if (unlikely(ret)) { | |
571f7f46 | 1127 | EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx", |
9e9db456 BH |
1128 | _LLU(exofs_oi_objno(oi)), |
1129 | _LLU(oi->one_comp.obj.partition)); | |
06886a5a BH |
1130 | /*TODO: When FS is corrupted creation can fail, object already |
1131 | * exist. Get rid of this asynchronous creation, if exist | |
1132 | * increment the obj counter and try the next object. Until we | |
1133 | * succeed. All these dangling objects will be made into lost | |
1134 | * files by chkfs.exofs | |
1135 | */ | |
1136 | } | |
1137 | ||
1138 | set_obj_created(oi); | |
e6af00f1 | 1139 | |
e6af00f1 BH |
1140 | wake_up(&oi->i_wq); |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Set up a new inode and create an object for it on the OSD | |
1145 | */ | |
1146 | struct inode *exofs_new_inode(struct inode *dir, int mode) | |
1147 | { | |
9e9db456 BH |
1148 | struct super_block *sb = dir->i_sb; |
1149 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
e6af00f1 BH |
1150 | struct inode *inode; |
1151 | struct exofs_i_info *oi; | |
8ff660ab | 1152 | struct ore_io_state *ios; |
e6af00f1 BH |
1153 | int ret; |
1154 | ||
e6af00f1 BH |
1155 | inode = new_inode(sb); |
1156 | if (!inode) | |
1157 | return ERR_PTR(-ENOMEM); | |
1158 | ||
1159 | oi = exofs_i(inode); | |
9cfdc7aa | 1160 | __oi_init(oi); |
e6af00f1 | 1161 | |
e6af00f1 BH |
1162 | set_obj_2bcreated(oi); |
1163 | ||
66cd6cad | 1164 | inode->i_mapping->backing_dev_info = sb->s_bdi; |
e00117f1 | 1165 | inode_init_owner(inode, dir, mode); |
e6af00f1 BH |
1166 | inode->i_ino = sbi->s_nextid++; |
1167 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1168 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1169 | oi->i_commit_size = inode->i_size = 0; | |
1170 | spin_lock(&sbi->s_next_gen_lock); | |
1171 | inode->i_generation = sbi->s_next_generation++; | |
1172 | spin_unlock(&sbi->s_next_gen_lock); | |
1173 | insert_inode_hash(inode); | |
1174 | ||
5bf696da | 1175 | exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info, |
9e9db456 | 1176 | exofs_oi_objno(oi)); |
1cea312a BH |
1177 | exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */ |
1178 | ||
e6af00f1 BH |
1179 | mark_inode_dirty(inode); |
1180 | ||
5bf696da | 1181 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
06886a5a | 1182 | if (unlikely(ret)) { |
8ff660ab | 1183 | EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n"); |
06886a5a | 1184 | return ERR_PTR(ret); |
e6af00f1 BH |
1185 | } |
1186 | ||
06886a5a BH |
1187 | ios->done = create_done; |
1188 | ios->private = inode; | |
9e9db456 | 1189 | |
8ff660ab | 1190 | ret = ore_create(ios); |
e6af00f1 | 1191 | if (ret) { |
8ff660ab | 1192 | ore_put_io_state(ios); |
06886a5a | 1193 | return ERR_PTR(ret); |
e6af00f1 BH |
1194 | } |
1195 | atomic_inc(&sbi->s_curr_pending); | |
1196 | ||
1197 | return inode; | |
1198 | } | |
ba9e5e98 BH |
1199 | |
1200 | /* | |
1201 | * struct to pass two arguments to update_inode's callback | |
1202 | */ | |
1203 | struct updatei_args { | |
1204 | struct exofs_sb_info *sbi; | |
1205 | struct exofs_fcb fcb; | |
1206 | }; | |
1207 | ||
1208 | /* | |
1209 | * Callback function from exofs_update_inode(). | |
1210 | */ | |
8ff660ab | 1211 | static void updatei_done(struct ore_io_state *ios, void *p) |
ba9e5e98 BH |
1212 | { |
1213 | struct updatei_args *args = p; | |
1214 | ||
8ff660ab | 1215 | ore_put_io_state(ios); |
ba9e5e98 BH |
1216 | |
1217 | atomic_dec(&args->sbi->s_curr_pending); | |
1218 | ||
1219 | kfree(args); | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Write the inode to the OSD. Just fill up the struct, and set the attribute | |
1224 | * synchronously or asynchronously depending on the do_sync flag. | |
1225 | */ | |
1226 | static int exofs_update_inode(struct inode *inode, int do_sync) | |
1227 | { | |
1228 | struct exofs_i_info *oi = exofs_i(inode); | |
1229 | struct super_block *sb = inode->i_sb; | |
1230 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
8ff660ab | 1231 | struct ore_io_state *ios; |
ba9e5e98 BH |
1232 | struct osd_attr attr; |
1233 | struct exofs_fcb *fcb; | |
1234 | struct updatei_args *args; | |
1235 | int ret; | |
1236 | ||
1237 | args = kzalloc(sizeof(*args), GFP_KERNEL); | |
34ce4e7c | 1238 | if (!args) { |
571f7f46 | 1239 | EXOFS_DBGMSG("Failed kzalloc of args\n"); |
ba9e5e98 | 1240 | return -ENOMEM; |
34ce4e7c | 1241 | } |
ba9e5e98 BH |
1242 | |
1243 | fcb = &args->fcb; | |
1244 | ||
1245 | fcb->i_mode = cpu_to_le16(inode->i_mode); | |
1246 | fcb->i_uid = cpu_to_le32(inode->i_uid); | |
1247 | fcb->i_gid = cpu_to_le32(inode->i_gid); | |
1248 | fcb->i_links_count = cpu_to_le16(inode->i_nlink); | |
1249 | fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); | |
1250 | fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec); | |
1251 | fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); | |
1252 | oi->i_commit_size = i_size_read(inode); | |
1253 | fcb->i_size = cpu_to_le64(oi->i_commit_size); | |
1254 | fcb->i_generation = cpu_to_le32(inode->i_generation); | |
1255 | ||
1256 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1257 | if (old_valid_dev(inode->i_rdev)) { | |
1258 | fcb->i_data[0] = | |
1259 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
1260 | fcb->i_data[1] = 0; | |
1261 | } else { | |
1262 | fcb->i_data[0] = 0; | |
1263 | fcb->i_data[1] = | |
1264 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
1265 | fcb->i_data[2] = 0; | |
1266 | } | |
1267 | } else | |
1268 | memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data)); | |
1269 | ||
5bf696da | 1270 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
06886a5a | 1271 | if (unlikely(ret)) { |
8ff660ab | 1272 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
ba9e5e98 BH |
1273 | goto free_args; |
1274 | } | |
1275 | ||
ba9e5e98 BH |
1276 | attr = g_attr_inode_data; |
1277 | attr.val_ptr = fcb; | |
06886a5a BH |
1278 | ios->out_attr_len = 1; |
1279 | ios->out_attr = &attr; | |
ba9e5e98 | 1280 | |
fe2fd9ed | 1281 | wait_obj_created(oi); |
ba9e5e98 | 1282 | |
06886a5a | 1283 | if (!do_sync) { |
ba9e5e98 | 1284 | args->sbi = sbi; |
06886a5a BH |
1285 | ios->done = updatei_done; |
1286 | ios->private = args; | |
1287 | } | |
ba9e5e98 | 1288 | |
8ff660ab | 1289 | ret = ore_write(ios); |
06886a5a | 1290 | if (!do_sync && !ret) { |
ba9e5e98 BH |
1291 | atomic_inc(&sbi->s_curr_pending); |
1292 | goto out; /* deallocation in updatei_done */ | |
1293 | } | |
1294 | ||
8ff660ab | 1295 | ore_put_io_state(ios); |
ba9e5e98 BH |
1296 | free_args: |
1297 | kfree(args); | |
1298 | out: | |
34ce4e7c BH |
1299 | EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n", |
1300 | inode->i_ino, do_sync, ret); | |
ba9e5e98 BH |
1301 | return ret; |
1302 | } | |
1303 | ||
a9185b41 | 1304 | int exofs_write_inode(struct inode *inode, struct writeback_control *wbc) |
ba9e5e98 | 1305 | { |
97178b7b NP |
1306 | /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */ |
1307 | return exofs_update_inode(inode, 1); | |
ba9e5e98 BH |
1308 | } |
1309 | ||
1310 | /* | |
1311 | * Callback function from exofs_delete_inode() - don't have much cleaning up to | |
1312 | * do. | |
1313 | */ | |
8ff660ab | 1314 | static void delete_done(struct ore_io_state *ios, void *p) |
ba9e5e98 | 1315 | { |
06886a5a BH |
1316 | struct exofs_sb_info *sbi = p; |
1317 | ||
8ff660ab | 1318 | ore_put_io_state(ios); |
06886a5a | 1319 | |
ba9e5e98 BH |
1320 | atomic_dec(&sbi->s_curr_pending); |
1321 | } | |
1322 | ||
1323 | /* | |
1324 | * Called when the refcount of an inode reaches zero. We remove the object | |
1325 | * from the OSD here. We make sure the object was created before we try and | |
1326 | * delete it. | |
1327 | */ | |
4ec70c9b | 1328 | void exofs_evict_inode(struct inode *inode) |
ba9e5e98 BH |
1329 | { |
1330 | struct exofs_i_info *oi = exofs_i(inode); | |
1331 | struct super_block *sb = inode->i_sb; | |
1332 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
8ff660ab | 1333 | struct ore_io_state *ios; |
ba9e5e98 BH |
1334 | int ret; |
1335 | ||
1336 | truncate_inode_pages(&inode->i_data, 0); | |
1337 | ||
2f246fd0 | 1338 | /* TODO: should do better here */ |
4ec70c9b | 1339 | if (inode->i_nlink || is_bad_inode(inode)) |
ba9e5e98 BH |
1340 | goto no_delete; |
1341 | ||
ba9e5e98 | 1342 | inode->i_size = 0; |
4ec70c9b | 1343 | end_writeback(inode); |
ba9e5e98 | 1344 | |
fe2fd9ed BH |
1345 | /* if we are deleting an obj that hasn't been created yet, wait. |
1346 | * This also makes sure that create_done cannot be called with an | |
1347 | * already evicted inode. | |
1348 | */ | |
1349 | wait_obj_created(oi); | |
1350 | /* ignore the error, attempt a remove anyway */ | |
2f246fd0 BH |
1351 | |
1352 | /* Now Remove the OSD objects */ | |
5bf696da | 1353 | ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios); |
2f246fd0 | 1354 | if (unlikely(ret)) { |
8ff660ab | 1355 | EXOFS_ERR("%s: ore_get_io_state failed\n", __func__); |
2f246fd0 | 1356 | return; |
ba9e5e98 BH |
1357 | } |
1358 | ||
06886a5a BH |
1359 | ios->done = delete_done; |
1360 | ios->private = sbi; | |
9e9db456 | 1361 | |
8ff660ab | 1362 | ret = ore_remove(ios); |
ba9e5e98 | 1363 | if (ret) { |
8ff660ab BH |
1364 | EXOFS_ERR("%s: ore_remove failed\n", __func__); |
1365 | ore_put_io_state(ios); | |
ba9e5e98 BH |
1366 | return; |
1367 | } | |
1368 | atomic_inc(&sbi->s_curr_pending); | |
1369 | ||
1370 | return; | |
1371 | ||
1372 | no_delete: | |
4ec70c9b | 1373 | end_writeback(inode); |
ba9e5e98 | 1374 | } |