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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 | ||
beaec07b BH |
46 | struct page_collect { |
47 | struct exofs_sb_info *sbi; | |
beaec07b BH |
48 | struct inode *inode; |
49 | unsigned expected_pages; | |
06886a5a | 50 | struct exofs_io_state *ios; |
beaec07b | 51 | |
86093aaf BH |
52 | struct page **pages; |
53 | unsigned alloc_pages; | |
beaec07b BH |
54 | unsigned nr_pages; |
55 | unsigned long length; | |
56 | loff_t pg_first; /* keep 64bit also in 32-arches */ | |
f17b1f9f BH |
57 | bool read_4_write; /* This means two things: that the read is sync |
58 | * And the pages should not be unlocked. | |
59 | */ | |
beaec07b BH |
60 | }; |
61 | ||
62 | static void _pcol_init(struct page_collect *pcol, unsigned expected_pages, | |
06886a5a | 63 | struct inode *inode) |
beaec07b BH |
64 | { |
65 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
beaec07b BH |
66 | |
67 | pcol->sbi = sbi; | |
beaec07b BH |
68 | pcol->inode = inode; |
69 | pcol->expected_pages = expected_pages; | |
70 | ||
06886a5a | 71 | pcol->ios = NULL; |
86093aaf BH |
72 | pcol->pages = NULL; |
73 | pcol->alloc_pages = 0; | |
beaec07b BH |
74 | pcol->nr_pages = 0; |
75 | pcol->length = 0; | |
76 | pcol->pg_first = -1; | |
f17b1f9f | 77 | pcol->read_4_write = false; |
beaec07b BH |
78 | } |
79 | ||
80 | static void _pcol_reset(struct page_collect *pcol) | |
81 | { | |
82 | pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages); | |
83 | ||
86093aaf BH |
84 | pcol->pages = NULL; |
85 | pcol->alloc_pages = 0; | |
beaec07b BH |
86 | pcol->nr_pages = 0; |
87 | pcol->length = 0; | |
88 | pcol->pg_first = -1; | |
06886a5a | 89 | pcol->ios = NULL; |
beaec07b BH |
90 | |
91 | /* this is probably the end of the loop but in writes | |
92 | * it might not end here. don't be left with nothing | |
93 | */ | |
94 | if (!pcol->expected_pages) | |
86093aaf | 95 | pcol->expected_pages = MAX_PAGES_KMALLOC; |
beaec07b BH |
96 | } |
97 | ||
98 | static int pcol_try_alloc(struct page_collect *pcol) | |
99 | { | |
86093aaf BH |
100 | unsigned pages = min_t(unsigned, pcol->expected_pages, |
101 | MAX_PAGES_KMALLOC); | |
06886a5a BH |
102 | |
103 | if (!pcol->ios) { /* First time allocate io_state */ | |
45d3abcb | 104 | int ret = exofs_get_io_state(&pcol->sbi->layout, &pcol->ios); |
06886a5a BH |
105 | |
106 | if (ret) | |
107 | return ret; | |
108 | } | |
beaec07b | 109 | |
86093aaf BH |
110 | /* TODO: easily support bio chaining */ |
111 | pages = min_t(unsigned, pages, | |
112 | pcol->sbi->layout.group_width * BIO_MAX_PAGES_KMALLOC); | |
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) { | |
134 | exofs_put_io_state(pcol->ios); | |
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 | ||
150 | static int update_read_page(struct page *page, int ret) | |
151 | { | |
152 | if (ret == 0) { | |
153 | /* Everything is OK */ | |
154 | SetPageUptodate(page); | |
155 | if (PageError(page)) | |
156 | ClearPageError(page); | |
157 | } else if (ret == -EFAULT) { | |
158 | /* In this case we were trying to read something that wasn't on | |
159 | * disk yet - return a page full of zeroes. This should be OK, | |
160 | * because the object should be empty (if there was a write | |
161 | * before this read, the read would be waiting with the page | |
162 | * locked */ | |
163 | clear_highpage(page); | |
164 | ||
165 | SetPageUptodate(page); | |
166 | if (PageError(page)) | |
167 | ClearPageError(page); | |
168 | ret = 0; /* recovered error */ | |
169 | EXOFS_DBGMSG("recovered read error\n"); | |
170 | } else /* Error */ | |
171 | SetPageError(page); | |
172 | ||
173 | return ret; | |
174 | } | |
175 | ||
176 | static void update_write_page(struct page *page, int ret) | |
177 | { | |
178 | if (ret) { | |
179 | mapping_set_error(page->mapping, ret); | |
180 | SetPageError(page); | |
181 | } | |
182 | end_page_writeback(page); | |
183 | } | |
184 | ||
185 | /* Called at the end of reads, to optionally unlock pages and update their | |
186 | * status. | |
187 | */ | |
06886a5a | 188 | static int __readpages_done(struct page_collect *pcol, bool do_unlock) |
beaec07b | 189 | { |
beaec07b BH |
190 | int i; |
191 | u64 resid; | |
192 | u64 good_bytes; | |
193 | u64 length = 0; | |
06886a5a | 194 | int ret = exofs_check_io(pcol->ios, &resid); |
beaec07b BH |
195 | |
196 | if (likely(!ret)) | |
197 | good_bytes = pcol->length; | |
beaec07b BH |
198 | else |
199 | good_bytes = pcol->length - resid; | |
200 | ||
34ce4e7c | 201 | EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
202 | " length=0x%lx nr_pages=%u\n", |
203 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
204 | pcol->nr_pages); | |
205 | ||
86093aaf BH |
206 | for (i = 0; i < pcol->nr_pages; i++) { |
207 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
208 | struct inode *inode = page->mapping->host; |
209 | int page_stat; | |
210 | ||
211 | if (inode != pcol->inode) | |
212 | continue; /* osd might add more pages at end */ | |
213 | ||
214 | if (likely(length < good_bytes)) | |
215 | page_stat = 0; | |
216 | else | |
217 | page_stat = ret; | |
218 | ||
fe33cc1e | 219 | EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n", |
beaec07b BH |
220 | inode->i_ino, page->index, |
221 | page_stat ? "bad_bytes" : "good_bytes"); | |
222 | ||
223 | ret = update_read_page(page, page_stat); | |
224 | if (do_unlock) | |
225 | unlock_page(page); | |
86093aaf | 226 | length += PAGE_SIZE; |
beaec07b BH |
227 | } |
228 | ||
229 | pcol_free(pcol); | |
34ce4e7c | 230 | EXOFS_DBGMSG2("readpages_done END\n"); |
beaec07b BH |
231 | return ret; |
232 | } | |
233 | ||
234 | /* callback of async reads */ | |
06886a5a | 235 | static void readpages_done(struct exofs_io_state *ios, void *p) |
beaec07b BH |
236 | { |
237 | struct page_collect *pcol = p; | |
238 | ||
06886a5a | 239 | __readpages_done(pcol, true); |
beaec07b | 240 | atomic_dec(&pcol->sbi->s_curr_pending); |
06886a5a | 241 | kfree(pcol); |
beaec07b BH |
242 | } |
243 | ||
244 | static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) | |
245 | { | |
beaec07b BH |
246 | int i; |
247 | ||
86093aaf BH |
248 | for (i = 0; i < pcol->nr_pages; i++) { |
249 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
250 | |
251 | if (rw == READ) | |
252 | update_read_page(page, ret); | |
253 | else | |
254 | update_write_page(page, ret); | |
255 | ||
256 | unlock_page(page); | |
257 | } | |
beaec07b BH |
258 | } |
259 | ||
260 | static int read_exec(struct page_collect *pcol, bool is_sync) | |
261 | { | |
262 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
06886a5a | 263 | struct exofs_io_state *ios = pcol->ios; |
beaec07b | 264 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
265 | int ret; |
266 | ||
86093aaf | 267 | if (!pcol->pages) |
beaec07b BH |
268 | return 0; |
269 | ||
270 | /* see comment in _readpage() about sync reads */ | |
271 | WARN_ON(is_sync && (pcol->nr_pages != 1)); | |
272 | ||
86093aaf BH |
273 | ios->pages = pcol->pages; |
274 | ios->nr_pages = pcol->nr_pages; | |
06886a5a BH |
275 | ios->length = pcol->length; |
276 | ios->offset = pcol->pg_first << PAGE_CACHE_SHIFT; | |
beaec07b BH |
277 | |
278 | if (is_sync) { | |
06886a5a BH |
279 | exofs_oi_read(oi, pcol->ios); |
280 | return __readpages_done(pcol, false); | |
beaec07b BH |
281 | } |
282 | ||
283 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); | |
284 | if (!pcol_copy) { | |
285 | ret = -ENOMEM; | |
286 | goto err; | |
287 | } | |
288 | ||
289 | *pcol_copy = *pcol; | |
06886a5a BH |
290 | ios->done = readpages_done; |
291 | ios->private = pcol_copy; | |
292 | ret = exofs_oi_read(oi, ios); | |
beaec07b BH |
293 | if (unlikely(ret)) |
294 | goto err; | |
295 | ||
296 | atomic_inc(&pcol->sbi->s_curr_pending); | |
297 | ||
34ce4e7c | 298 | EXOFS_DBGMSG2("read_exec obj=0x%llx start=0x%llx length=0x%lx\n", |
06886a5a | 299 | ios->obj.id, _LLU(ios->offset), pcol->length); |
beaec07b BH |
300 | |
301 | /* pages ownership was passed to pcol_copy */ | |
302 | _pcol_reset(pcol); | |
303 | return 0; | |
304 | ||
305 | err: | |
306 | if (!is_sync) | |
307 | _unlock_pcol_pages(pcol, ret, READ); | |
06886a5a BH |
308 | |
309 | pcol_free(pcol); | |
b76a3f93 | 310 | |
beaec07b | 311 | kfree(pcol_copy); |
beaec07b BH |
312 | return ret; |
313 | } | |
314 | ||
315 | /* readpage_strip is called either directly from readpage() or by the VFS from | |
316 | * within read_cache_pages(), to add one more page to be read. It will try to | |
317 | * collect as many contiguous pages as posible. If a discontinuity is | |
318 | * encountered, or it runs out of resources, it will submit the previous segment | |
319 | * and will start a new collection. Eventually caller must submit the last | |
320 | * segment if present. | |
321 | */ | |
322 | static int readpage_strip(void *data, struct page *page) | |
323 | { | |
324 | struct page_collect *pcol = data; | |
325 | struct inode *inode = pcol->inode; | |
326 | struct exofs_i_info *oi = exofs_i(inode); | |
327 | loff_t i_size = i_size_read(inode); | |
328 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
329 | size_t len; | |
330 | int ret; | |
331 | ||
332 | /* FIXME: Just for debugging, will be removed */ | |
333 | if (PageUptodate(page)) | |
334 | EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino, | |
335 | page->index); | |
336 | ||
337 | if (page->index < end_index) | |
338 | len = PAGE_CACHE_SIZE; | |
339 | else if (page->index == end_index) | |
340 | len = i_size & ~PAGE_CACHE_MASK; | |
341 | else | |
342 | len = 0; | |
343 | ||
344 | if (!len || !obj_created(oi)) { | |
345 | /* this will be out of bounds, or doesn't exist yet. | |
346 | * Current page is cleared and the request is split | |
347 | */ | |
348 | clear_highpage(page); | |
349 | ||
350 | SetPageUptodate(page); | |
351 | if (PageError(page)) | |
352 | ClearPageError(page); | |
353 | ||
f17b1f9f BH |
354 | if (!pcol->read_4_write) |
355 | unlock_page(page); | |
beaec07b BH |
356 | EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page," |
357 | " splitting\n", inode->i_ino, page->index); | |
358 | ||
359 | return read_exec(pcol, false); | |
360 | } | |
361 | ||
362 | try_again: | |
363 | ||
364 | if (unlikely(pcol->pg_first == -1)) { | |
365 | pcol->pg_first = page->index; | |
366 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
367 | page->index)) { | |
368 | /* Discontinuity detected, split the request */ | |
369 | ret = read_exec(pcol, false); | |
370 | if (unlikely(ret)) | |
371 | goto fail; | |
372 | goto try_again; | |
373 | } | |
374 | ||
86093aaf | 375 | if (!pcol->pages) { |
beaec07b BH |
376 | ret = pcol_try_alloc(pcol); |
377 | if (unlikely(ret)) | |
378 | goto fail; | |
379 | } | |
380 | ||
381 | if (len != PAGE_CACHE_SIZE) | |
382 | zero_user(page, len, PAGE_CACHE_SIZE - len); | |
383 | ||
fe33cc1e | 384 | EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
385 | inode->i_ino, page->index, len); |
386 | ||
387 | ret = pcol_add_page(pcol, page, len); | |
388 | if (ret) { | |
fe33cc1e | 389 | EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p " |
beaec07b BH |
390 | "this_len=0x%zx nr_pages=%u length=0x%lx\n", |
391 | page, len, pcol->nr_pages, pcol->length); | |
392 | ||
393 | /* split the request, and start again with current page */ | |
394 | ret = read_exec(pcol, false); | |
395 | if (unlikely(ret)) | |
396 | goto fail; | |
397 | ||
398 | goto try_again; | |
399 | } | |
400 | ||
401 | return 0; | |
402 | ||
403 | fail: | |
404 | /* SetPageError(page); ??? */ | |
405 | unlock_page(page); | |
406 | return ret; | |
407 | } | |
408 | ||
409 | static int exofs_readpages(struct file *file, struct address_space *mapping, | |
410 | struct list_head *pages, unsigned nr_pages) | |
411 | { | |
412 | struct page_collect pcol; | |
413 | int ret; | |
414 | ||
415 | _pcol_init(&pcol, nr_pages, mapping->host); | |
416 | ||
417 | ret = read_cache_pages(mapping, pages, readpage_strip, &pcol); | |
418 | if (ret) { | |
419 | EXOFS_ERR("read_cache_pages => %d\n", ret); | |
420 | return ret; | |
421 | } | |
422 | ||
423 | return read_exec(&pcol, false); | |
424 | } | |
425 | ||
426 | static int _readpage(struct page *page, bool is_sync) | |
427 | { | |
428 | struct page_collect pcol; | |
429 | int ret; | |
430 | ||
431 | _pcol_init(&pcol, 1, page->mapping->host); | |
432 | ||
06886a5a BH |
433 | /* readpage_strip might call read_exec(,is_sync==false) at several |
434 | * places but not if we have a single page. | |
beaec07b | 435 | */ |
f17b1f9f | 436 | pcol.read_4_write = is_sync; |
beaec07b BH |
437 | ret = readpage_strip(&pcol, page); |
438 | if (ret) { | |
439 | EXOFS_ERR("_readpage => %d\n", ret); | |
440 | return ret; | |
441 | } | |
442 | ||
443 | return read_exec(&pcol, is_sync); | |
444 | } | |
445 | ||
446 | /* | |
447 | * We don't need the file | |
448 | */ | |
449 | static int exofs_readpage(struct file *file, struct page *page) | |
450 | { | |
451 | return _readpage(page, false); | |
452 | } | |
453 | ||
06886a5a BH |
454 | /* Callback for osd_write. All writes are asynchronous */ |
455 | static void writepages_done(struct exofs_io_state *ios, void *p) | |
beaec07b BH |
456 | { |
457 | struct page_collect *pcol = p; | |
beaec07b BH |
458 | int i; |
459 | u64 resid; | |
460 | u64 good_bytes; | |
461 | u64 length = 0; | |
06886a5a | 462 | int ret = exofs_check_io(ios, &resid); |
beaec07b | 463 | |
beaec07b BH |
464 | atomic_dec(&pcol->sbi->s_curr_pending); |
465 | ||
466 | if (likely(!ret)) | |
467 | good_bytes = pcol->length; | |
beaec07b BH |
468 | else |
469 | good_bytes = pcol->length - resid; | |
470 | ||
34ce4e7c | 471 | EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
472 | " length=0x%lx nr_pages=%u\n", |
473 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
474 | pcol->nr_pages); | |
475 | ||
86093aaf BH |
476 | for (i = 0; i < pcol->nr_pages; i++) { |
477 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
478 | struct inode *inode = page->mapping->host; |
479 | int page_stat; | |
480 | ||
481 | if (inode != pcol->inode) | |
482 | continue; /* osd might add more pages to a bio */ | |
483 | ||
484 | if (likely(length < good_bytes)) | |
485 | page_stat = 0; | |
486 | else | |
487 | page_stat = ret; | |
488 | ||
489 | update_write_page(page, page_stat); | |
490 | unlock_page(page); | |
fe33cc1e | 491 | EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n", |
beaec07b BH |
492 | inode->i_ino, page->index, page_stat); |
493 | ||
86093aaf | 494 | length += PAGE_SIZE; |
beaec07b BH |
495 | } |
496 | ||
497 | pcol_free(pcol); | |
498 | kfree(pcol); | |
34ce4e7c | 499 | EXOFS_DBGMSG2("writepages_done END\n"); |
beaec07b BH |
500 | } |
501 | ||
502 | static int write_exec(struct page_collect *pcol) | |
503 | { | |
504 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
06886a5a | 505 | struct exofs_io_state *ios = pcol->ios; |
beaec07b | 506 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
507 | int ret; |
508 | ||
86093aaf | 509 | if (!pcol->pages) |
beaec07b BH |
510 | return 0; |
511 | ||
beaec07b BH |
512 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
513 | if (!pcol_copy) { | |
514 | EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n"); | |
515 | ret = -ENOMEM; | |
516 | goto err; | |
517 | } | |
518 | ||
519 | *pcol_copy = *pcol; | |
520 | ||
86093aaf BH |
521 | ios->pages = pcol_copy->pages; |
522 | ios->nr_pages = pcol_copy->nr_pages; | |
06886a5a BH |
523 | ios->offset = pcol_copy->pg_first << PAGE_CACHE_SHIFT; |
524 | ios->length = pcol_copy->length; | |
525 | ios->done = writepages_done; | |
526 | ios->private = pcol_copy; | |
527 | ||
528 | ret = exofs_oi_write(oi, ios); | |
beaec07b | 529 | if (unlikely(ret)) { |
06886a5a | 530 | EXOFS_ERR("write_exec: exofs_oi_write() Faild\n"); |
beaec07b BH |
531 | goto err; |
532 | } | |
533 | ||
534 | atomic_inc(&pcol->sbi->s_curr_pending); | |
34ce4e7c | 535 | EXOFS_DBGMSG2("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n", |
06886a5a | 536 | pcol->inode->i_ino, pcol->pg_first, _LLU(ios->offset), |
beaec07b BH |
537 | pcol->length); |
538 | /* pages ownership was passed to pcol_copy */ | |
539 | _pcol_reset(pcol); | |
540 | return 0; | |
541 | ||
542 | err: | |
543 | _unlock_pcol_pages(pcol, ret, WRITE); | |
06886a5a | 544 | pcol_free(pcol); |
beaec07b | 545 | kfree(pcol_copy); |
06886a5a | 546 | |
beaec07b BH |
547 | return ret; |
548 | } | |
549 | ||
550 | /* writepage_strip is called either directly from writepage() or by the VFS from | |
551 | * within write_cache_pages(), to add one more page to be written to storage. | |
552 | * It will try to collect as many contiguous pages as possible. If a | |
553 | * discontinuity is encountered or it runs out of resources it will submit the | |
554 | * previous segment and will start a new collection. | |
555 | * Eventually caller must submit the last segment if present. | |
556 | */ | |
557 | static int writepage_strip(struct page *page, | |
558 | struct writeback_control *wbc_unused, void *data) | |
559 | { | |
560 | struct page_collect *pcol = data; | |
561 | struct inode *inode = pcol->inode; | |
562 | struct exofs_i_info *oi = exofs_i(inode); | |
563 | loff_t i_size = i_size_read(inode); | |
564 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
565 | size_t len; | |
566 | int ret; | |
567 | ||
568 | BUG_ON(!PageLocked(page)); | |
569 | ||
570 | ret = wait_obj_created(oi); | |
571 | if (unlikely(ret)) | |
572 | goto fail; | |
573 | ||
574 | if (page->index < end_index) | |
575 | /* in this case, the page is within the limits of the file */ | |
576 | len = PAGE_CACHE_SIZE; | |
577 | else { | |
578 | len = i_size & ~PAGE_CACHE_MASK; | |
579 | ||
580 | if (page->index > end_index || !len) { | |
581 | /* in this case, the page is outside the limits | |
582 | * (truncate in progress) | |
583 | */ | |
584 | ret = write_exec(pcol); | |
585 | if (unlikely(ret)) | |
586 | goto fail; | |
587 | if (PageError(page)) | |
588 | ClearPageError(page); | |
589 | unlock_page(page); | |
06886a5a BH |
590 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) " |
591 | "outside the limits\n", | |
592 | inode->i_ino, page->index); | |
beaec07b BH |
593 | return 0; |
594 | } | |
595 | } | |
596 | ||
597 | try_again: | |
598 | ||
599 | if (unlikely(pcol->pg_first == -1)) { | |
600 | pcol->pg_first = page->index; | |
601 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
602 | page->index)) { | |
603 | /* Discontinuity detected, split the request */ | |
604 | ret = write_exec(pcol); | |
605 | if (unlikely(ret)) | |
606 | goto fail; | |
06886a5a BH |
607 | |
608 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n", | |
609 | inode->i_ino, page->index); | |
beaec07b BH |
610 | goto try_again; |
611 | } | |
612 | ||
86093aaf | 613 | if (!pcol->pages) { |
beaec07b BH |
614 | ret = pcol_try_alloc(pcol); |
615 | if (unlikely(ret)) | |
616 | goto fail; | |
617 | } | |
618 | ||
fe33cc1e | 619 | EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
620 | inode->i_ino, page->index, len); |
621 | ||
622 | ret = pcol_add_page(pcol, page, len); | |
623 | if (unlikely(ret)) { | |
34ce4e7c | 624 | EXOFS_DBGMSG2("Failed pcol_add_page " |
beaec07b BH |
625 | "nr_pages=%u total_length=0x%lx\n", |
626 | pcol->nr_pages, pcol->length); | |
627 | ||
628 | /* split the request, next loop will start again */ | |
629 | ret = write_exec(pcol); | |
630 | if (unlikely(ret)) { | |
631 | EXOFS_DBGMSG("write_exec faild => %d", ret); | |
632 | goto fail; | |
633 | } | |
634 | ||
635 | goto try_again; | |
636 | } | |
637 | ||
638 | BUG_ON(PageWriteback(page)); | |
639 | set_page_writeback(page); | |
640 | ||
641 | return 0; | |
642 | ||
643 | fail: | |
06886a5a BH |
644 | EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n", |
645 | inode->i_ino, page->index, ret); | |
beaec07b BH |
646 | set_bit(AS_EIO, &page->mapping->flags); |
647 | unlock_page(page); | |
648 | return ret; | |
649 | } | |
650 | ||
651 | static int exofs_writepages(struct address_space *mapping, | |
652 | struct writeback_control *wbc) | |
653 | { | |
654 | struct page_collect pcol; | |
655 | long start, end, expected_pages; | |
656 | int ret; | |
657 | ||
658 | start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
659 | end = (wbc->range_end == LLONG_MAX) ? | |
660 | start + mapping->nrpages : | |
661 | wbc->range_end >> PAGE_CACHE_SHIFT; | |
662 | ||
663 | if (start || end) | |
06886a5a | 664 | expected_pages = end - start + 1; |
beaec07b BH |
665 | else |
666 | expected_pages = mapping->nrpages; | |
667 | ||
06886a5a BH |
668 | if (expected_pages < 32L) |
669 | expected_pages = 32L; | |
670 | ||
34ce4e7c | 671 | EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx " |
06886a5a | 672 | "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n", |
beaec07b | 673 | mapping->host->i_ino, wbc->range_start, wbc->range_end, |
06886a5a | 674 | mapping->nrpages, start, end, expected_pages); |
beaec07b BH |
675 | |
676 | _pcol_init(&pcol, expected_pages, mapping->host); | |
677 | ||
678 | ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); | |
679 | if (ret) { | |
680 | EXOFS_ERR("write_cache_pages => %d\n", ret); | |
681 | return ret; | |
682 | } | |
683 | ||
684 | return write_exec(&pcol); | |
685 | } | |
686 | ||
687 | static int exofs_writepage(struct page *page, struct writeback_control *wbc) | |
688 | { | |
689 | struct page_collect pcol; | |
690 | int ret; | |
691 | ||
692 | _pcol_init(&pcol, 1, page->mapping->host); | |
693 | ||
694 | ret = writepage_strip(page, NULL, &pcol); | |
695 | if (ret) { | |
696 | EXOFS_ERR("exofs_writepage => %d\n", ret); | |
697 | return ret; | |
698 | } | |
699 | ||
700 | return write_exec(&pcol); | |
701 | } | |
702 | ||
2f246fd0 BH |
703 | /* i_mutex held using inode->i_size directly */ |
704 | static void _write_failed(struct inode *inode, loff_t to) | |
705 | { | |
706 | if (to > inode->i_size) | |
707 | truncate_pagecache(inode, to, inode->i_size); | |
708 | } | |
709 | ||
beaec07b BH |
710 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
711 | loff_t pos, unsigned len, unsigned flags, | |
712 | struct page **pagep, void **fsdata) | |
713 | { | |
714 | int ret = 0; | |
715 | struct page *page; | |
716 | ||
717 | page = *pagep; | |
718 | if (page == NULL) { | |
719 | ret = simple_write_begin(file, mapping, pos, len, flags, pagep, | |
720 | fsdata); | |
721 | if (ret) { | |
722 | EXOFS_DBGMSG("simple_write_begin faild\n"); | |
2f246fd0 | 723 | goto out; |
beaec07b BH |
724 | } |
725 | ||
726 | page = *pagep; | |
727 | } | |
728 | ||
729 | /* read modify write */ | |
730 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { | |
731 | ret = _readpage(page, true); | |
732 | if (ret) { | |
733 | /*SetPageError was done by _readpage. Is it ok?*/ | |
734 | unlock_page(page); | |
735 | EXOFS_DBGMSG("__readpage_filler faild\n"); | |
736 | } | |
737 | } | |
2f246fd0 BH |
738 | out: |
739 | if (unlikely(ret)) | |
740 | _write_failed(mapping->host, pos + len); | |
beaec07b BH |
741 | |
742 | return ret; | |
743 | } | |
744 | ||
745 | static int exofs_write_begin_export(struct file *file, | |
746 | struct address_space *mapping, | |
747 | loff_t pos, unsigned len, unsigned flags, | |
748 | struct page **pagep, void **fsdata) | |
749 | { | |
750 | *pagep = NULL; | |
751 | ||
752 | return exofs_write_begin(file, mapping, pos, len, flags, pagep, | |
753 | fsdata); | |
754 | } | |
755 | ||
efd124b9 BH |
756 | static int exofs_write_end(struct file *file, struct address_space *mapping, |
757 | loff_t pos, unsigned len, unsigned copied, | |
758 | struct page *page, void *fsdata) | |
759 | { | |
760 | struct inode *inode = mapping->host; | |
761 | /* According to comment in simple_write_end i_mutex is held */ | |
762 | loff_t i_size = inode->i_size; | |
763 | int ret; | |
764 | ||
765 | ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata); | |
2f246fd0 BH |
766 | if (unlikely(ret)) |
767 | _write_failed(inode, pos + len); | |
768 | ||
769 | /* TODO: once simple_write_end marks inode dirty remove */ | |
efd124b9 BH |
770 | if (i_size != inode->i_size) |
771 | mark_inode_dirty(inode); | |
772 | return ret; | |
773 | } | |
774 | ||
200b0700 BH |
775 | static int exofs_releasepage(struct page *page, gfp_t gfp) |
776 | { | |
777 | EXOFS_DBGMSG("page 0x%lx\n", page->index); | |
778 | WARN_ON(1); | |
85dc7878 | 779 | return 0; |
200b0700 BH |
780 | } |
781 | ||
782 | static void exofs_invalidatepage(struct page *page, unsigned long offset) | |
783 | { | |
85dc7878 | 784 | EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset); |
200b0700 | 785 | WARN_ON(1); |
200b0700 BH |
786 | } |
787 | ||
beaec07b BH |
788 | const struct address_space_operations exofs_aops = { |
789 | .readpage = exofs_readpage, | |
790 | .readpages = exofs_readpages, | |
791 | .writepage = exofs_writepage, | |
792 | .writepages = exofs_writepages, | |
793 | .write_begin = exofs_write_begin_export, | |
efd124b9 | 794 | .write_end = exofs_write_end, |
200b0700 BH |
795 | .releasepage = exofs_releasepage, |
796 | .set_page_dirty = __set_page_dirty_nobuffers, | |
797 | .invalidatepage = exofs_invalidatepage, | |
798 | ||
799 | /* Not implemented Yet */ | |
800 | .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */ | |
801 | .direct_IO = NULL, /* TODO: Should be trivial to do */ | |
802 | ||
803 | /* With these NULL has special meaning or default is not exported */ | |
804 | .sync_page = NULL, | |
805 | .get_xip_mem = NULL, | |
806 | .migratepage = NULL, | |
807 | .launder_page = NULL, | |
808 | .is_partially_uptodate = NULL, | |
809 | .error_remove_page = NULL, | |
beaec07b BH |
810 | }; |
811 | ||
e8062719 BH |
812 | /****************************************************************************** |
813 | * INODE OPERATIONS | |
814 | *****************************************************************************/ | |
815 | ||
816 | /* | |
817 | * Test whether an inode is a fast symlink. | |
818 | */ | |
819 | static inline int exofs_inode_is_fast_symlink(struct inode *inode) | |
820 | { | |
821 | struct exofs_i_info *oi = exofs_i(inode); | |
822 | ||
823 | return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); | |
824 | } | |
825 | ||
e8062719 BH |
826 | const struct osd_attr g_attr_logical_length = ATTR_DEF( |
827 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); | |
828 | ||
2f246fd0 | 829 | static int _do_truncate(struct inode *inode, loff_t newsize) |
06886a5a BH |
830 | { |
831 | struct exofs_i_info *oi = exofs_i(inode); | |
06886a5a BH |
832 | int ret; |
833 | ||
834 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
835 | ||
2f246fd0 BH |
836 | ret = exofs_oi_truncate(oi, (u64)newsize); |
837 | if (likely(!ret)) | |
838 | truncate_setsize(inode, newsize); | |
06886a5a | 839 | |
2f246fd0 BH |
840 | EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n", |
841 | inode->i_ino, newsize, ret); | |
06886a5a BH |
842 | return ret; |
843 | } | |
844 | ||
e8062719 | 845 | /* |
2f246fd0 BH |
846 | * Set inode attributes - update size attribute on OSD if needed, |
847 | * otherwise just call generic functions. | |
e8062719 BH |
848 | */ |
849 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) | |
850 | { | |
851 | struct inode *inode = dentry->d_inode; | |
852 | int error; | |
853 | ||
2f246fd0 BH |
854 | /* if we are about to modify an object, and it hasn't been |
855 | * created yet, wait | |
856 | */ | |
857 | error = wait_obj_created(exofs_i(inode)); | |
858 | if (unlikely(error)) | |
859 | return error; | |
860 | ||
e8062719 | 861 | error = inode_change_ok(inode, iattr); |
2f246fd0 | 862 | if (unlikely(error)) |
e8062719 BH |
863 | return error; |
864 | ||
1025774c CH |
865 | if ((iattr->ia_valid & ATTR_SIZE) && |
866 | iattr->ia_size != i_size_read(inode)) { | |
2f246fd0 BH |
867 | error = _do_truncate(inode, iattr->ia_size); |
868 | if (unlikely(error)) | |
1025774c CH |
869 | return error; |
870 | } | |
871 | ||
872 | setattr_copy(inode, iattr); | |
873 | mark_inode_dirty(inode); | |
874 | return 0; | |
e8062719 | 875 | } |
e6af00f1 | 876 | |
d9c740d2 BH |
877 | static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF( |
878 | EXOFS_APAGE_FS_DATA, | |
879 | EXOFS_ATTR_INODE_FILE_LAYOUT, | |
880 | 0); | |
881 | static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF( | |
882 | EXOFS_APAGE_FS_DATA, | |
883 | EXOFS_ATTR_INODE_DIR_LAYOUT, | |
884 | 0); | |
885 | ||
e6af00f1 | 886 | /* |
5d952b83 BH |
887 | * Read the Linux inode info from the OSD, and return it as is. In exofs the |
888 | * inode info is in an application specific page/attribute of the osd-object. | |
e6af00f1 BH |
889 | */ |
890 | static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, | |
5d952b83 | 891 | struct exofs_fcb *inode) |
e6af00f1 BH |
892 | { |
893 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
d9c740d2 BH |
894 | struct osd_attr attrs[] = { |
895 | [0] = g_attr_inode_data, | |
896 | [1] = g_attr_inode_file_layout, | |
897 | [2] = g_attr_inode_dir_layout, | |
d9c740d2 | 898 | }; |
06886a5a | 899 | struct exofs_io_state *ios; |
d9c740d2 | 900 | struct exofs_on_disk_inode_layout *layout; |
e6af00f1 BH |
901 | int ret; |
902 | ||
45d3abcb | 903 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
904 | if (unlikely(ret)) { |
905 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); | |
906 | return ret; | |
e6af00f1 | 907 | } |
e6af00f1 | 908 | |
06886a5a BH |
909 | ios->obj.id = exofs_oi_objno(oi); |
910 | exofs_make_credential(oi->i_cred, &ios->obj); | |
911 | ios->cred = oi->i_cred; | |
e6af00f1 | 912 | |
d9c740d2 BH |
913 | attrs[1].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs); |
914 | attrs[2].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs); | |
915 | ||
06886a5a BH |
916 | ios->in_attr = attrs; |
917 | ios->in_attr_len = ARRAY_SIZE(attrs); | |
e6af00f1 | 918 | |
06886a5a | 919 | ret = exofs_sbi_read(ios); |
96391e2b BH |
920 | if (unlikely(ret)) { |
921 | EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n", | |
922 | _LLU(ios->obj.id), ret); | |
923 | memset(inode, 0, sizeof(*inode)); | |
924 | inode->i_mode = 0040000 | (0777 & ~022); | |
925 | /* If object is lost on target we might as well enable it's | |
926 | * delete. | |
927 | */ | |
928 | if ((ret == -ENOENT) || (ret == -EINVAL)) | |
929 | ret = 0; | |
e6af00f1 | 930 | goto out; |
96391e2b | 931 | } |
e6af00f1 | 932 | |
06886a5a | 933 | ret = extract_attr_from_ios(ios, &attrs[0]); |
e6af00f1 | 934 | if (ret) { |
06886a5a | 935 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
e6af00f1 BH |
936 | goto out; |
937 | } | |
06886a5a BH |
938 | WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE); |
939 | memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE); | |
e6af00f1 | 940 | |
06886a5a | 941 | ret = extract_attr_from_ios(ios, &attrs[1]); |
d9c740d2 BH |
942 | if (ret) { |
943 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
944 | goto out; | |
945 | } | |
946 | if (attrs[1].len) { | |
947 | layout = attrs[1].val_ptr; | |
948 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
949 | EXOFS_ERR("%s: unsupported files layout %d\n", | |
950 | __func__, layout->gen_func); | |
951 | ret = -ENOTSUPP; | |
952 | goto out; | |
953 | } | |
954 | } | |
955 | ||
956 | ret = extract_attr_from_ios(ios, &attrs[2]); | |
957 | if (ret) { | |
958 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
959 | goto out; | |
960 | } | |
961 | if (attrs[2].len) { | |
962 | layout = attrs[2].val_ptr; | |
963 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
964 | EXOFS_ERR("%s: unsupported meta-data layout %d\n", | |
965 | __func__, layout->gen_func); | |
966 | ret = -ENOTSUPP; | |
967 | goto out; | |
968 | } | |
969 | } | |
970 | ||
e6af00f1 | 971 | out: |
06886a5a | 972 | exofs_put_io_state(ios); |
e6af00f1 BH |
973 | return ret; |
974 | } | |
975 | ||
9cfdc7aa BH |
976 | static void __oi_init(struct exofs_i_info *oi) |
977 | { | |
978 | init_waitqueue_head(&oi->i_wq); | |
979 | oi->i_flags = 0; | |
980 | } | |
e6af00f1 BH |
981 | /* |
982 | * Fill in an inode read from the OSD and set it up for use | |
983 | */ | |
984 | struct inode *exofs_iget(struct super_block *sb, unsigned long ino) | |
985 | { | |
986 | struct exofs_i_info *oi; | |
987 | struct exofs_fcb fcb; | |
988 | struct inode *inode; | |
e6af00f1 BH |
989 | int ret; |
990 | ||
991 | inode = iget_locked(sb, ino); | |
992 | if (!inode) | |
993 | return ERR_PTR(-ENOMEM); | |
994 | if (!(inode->i_state & I_NEW)) | |
995 | return inode; | |
996 | oi = exofs_i(inode); | |
9cfdc7aa | 997 | __oi_init(oi); |
e6af00f1 BH |
998 | |
999 | /* read the inode from the osd */ | |
5d952b83 | 1000 | ret = exofs_get_inode(sb, oi, &fcb); |
e6af00f1 BH |
1001 | if (ret) |
1002 | goto bad_inode; | |
1003 | ||
e6af00f1 BH |
1004 | set_obj_created(oi); |
1005 | ||
1006 | /* copy stuff from on-disk struct to in-memory struct */ | |
1007 | inode->i_mode = le16_to_cpu(fcb.i_mode); | |
1008 | inode->i_uid = le32_to_cpu(fcb.i_uid); | |
1009 | inode->i_gid = le32_to_cpu(fcb.i_gid); | |
1010 | inode->i_nlink = le16_to_cpu(fcb.i_links_count); | |
1011 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime); | |
1012 | inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime); | |
1013 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime); | |
1014 | inode->i_ctime.tv_nsec = | |
1015 | inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0; | |
1016 | oi->i_commit_size = le64_to_cpu(fcb.i_size); | |
1017 | i_size_write(inode, oi->i_commit_size); | |
1018 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1019 | inode->i_generation = le32_to_cpu(fcb.i_generation); | |
1020 | ||
e6af00f1 BH |
1021 | oi->i_dir_start_lookup = 0; |
1022 | ||
1023 | if ((inode->i_nlink == 0) && (inode->i_mode == 0)) { | |
1024 | ret = -ESTALE; | |
1025 | goto bad_inode; | |
1026 | } | |
1027 | ||
1028 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1029 | if (fcb.i_data[0]) | |
1030 | inode->i_rdev = | |
1031 | old_decode_dev(le32_to_cpu(fcb.i_data[0])); | |
1032 | else | |
1033 | inode->i_rdev = | |
1034 | new_decode_dev(le32_to_cpu(fcb.i_data[1])); | |
1035 | } else { | |
1036 | memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); | |
1037 | } | |
1038 | ||
1039 | if (S_ISREG(inode->i_mode)) { | |
1040 | inode->i_op = &exofs_file_inode_operations; | |
1041 | inode->i_fop = &exofs_file_operations; | |
1042 | inode->i_mapping->a_ops = &exofs_aops; | |
1043 | } else if (S_ISDIR(inode->i_mode)) { | |
1044 | inode->i_op = &exofs_dir_inode_operations; | |
1045 | inode->i_fop = &exofs_dir_operations; | |
1046 | inode->i_mapping->a_ops = &exofs_aops; | |
1047 | } else if (S_ISLNK(inode->i_mode)) { | |
1048 | if (exofs_inode_is_fast_symlink(inode)) | |
1049 | inode->i_op = &exofs_fast_symlink_inode_operations; | |
1050 | else { | |
1051 | inode->i_op = &exofs_symlink_inode_operations; | |
1052 | inode->i_mapping->a_ops = &exofs_aops; | |
1053 | } | |
1054 | } else { | |
1055 | inode->i_op = &exofs_special_inode_operations; | |
1056 | if (fcb.i_data[0]) | |
1057 | init_special_inode(inode, inode->i_mode, | |
1058 | old_decode_dev(le32_to_cpu(fcb.i_data[0]))); | |
1059 | else | |
1060 | init_special_inode(inode, inode->i_mode, | |
1061 | new_decode_dev(le32_to_cpu(fcb.i_data[1]))); | |
1062 | } | |
1063 | ||
1064 | unlock_new_inode(inode); | |
1065 | return inode; | |
1066 | ||
1067 | bad_inode: | |
1068 | iget_failed(inode); | |
1069 | return ERR_PTR(ret); | |
1070 | } | |
1071 | ||
1072 | int __exofs_wait_obj_created(struct exofs_i_info *oi) | |
1073 | { | |
1074 | if (!obj_created(oi)) { | |
1075 | BUG_ON(!obj_2bcreated(oi)); | |
1076 | wait_event(oi->i_wq, obj_created(oi)); | |
1077 | } | |
1078 | return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; | |
1079 | } | |
1080 | /* | |
1081 | * Callback function from exofs_new_inode(). The important thing is that we | |
1082 | * set the obj_created flag so that other methods know that the object exists on | |
1083 | * the OSD. | |
1084 | */ | |
06886a5a | 1085 | static void create_done(struct exofs_io_state *ios, void *p) |
e6af00f1 BH |
1086 | { |
1087 | struct inode *inode = p; | |
1088 | struct exofs_i_info *oi = exofs_i(inode); | |
1089 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
1090 | int ret; | |
1091 | ||
06886a5a BH |
1092 | ret = exofs_check_io(ios, NULL); |
1093 | exofs_put_io_state(ios); | |
1094 | ||
e6af00f1 BH |
1095 | atomic_dec(&sbi->s_curr_pending); |
1096 | ||
1097 | if (unlikely(ret)) { | |
1098 | EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx", | |
45d3abcb | 1099 | _LLU(exofs_oi_objno(oi)), _LLU(sbi->layout.s_pid)); |
06886a5a BH |
1100 | /*TODO: When FS is corrupted creation can fail, object already |
1101 | * exist. Get rid of this asynchronous creation, if exist | |
1102 | * increment the obj counter and try the next object. Until we | |
1103 | * succeed. All these dangling objects will be made into lost | |
1104 | * files by chkfs.exofs | |
1105 | */ | |
1106 | } | |
1107 | ||
1108 | set_obj_created(oi); | |
e6af00f1 BH |
1109 | |
1110 | atomic_dec(&inode->i_count); | |
1111 | wake_up(&oi->i_wq); | |
1112 | } | |
1113 | ||
1114 | /* | |
1115 | * Set up a new inode and create an object for it on the OSD | |
1116 | */ | |
1117 | struct inode *exofs_new_inode(struct inode *dir, int mode) | |
1118 | { | |
1119 | struct super_block *sb; | |
1120 | struct inode *inode; | |
1121 | struct exofs_i_info *oi; | |
1122 | struct exofs_sb_info *sbi; | |
06886a5a | 1123 | struct exofs_io_state *ios; |
e6af00f1 BH |
1124 | int ret; |
1125 | ||
1126 | sb = dir->i_sb; | |
1127 | inode = new_inode(sb); | |
1128 | if (!inode) | |
1129 | return ERR_PTR(-ENOMEM); | |
1130 | ||
1131 | oi = exofs_i(inode); | |
9cfdc7aa | 1132 | __oi_init(oi); |
e6af00f1 | 1133 | |
e6af00f1 BH |
1134 | set_obj_2bcreated(oi); |
1135 | ||
1136 | sbi = sb->s_fs_info; | |
1137 | ||
1138 | sb->s_dirt = 1; | |
e00117f1 | 1139 | inode_init_owner(inode, dir, mode); |
e6af00f1 BH |
1140 | inode->i_ino = sbi->s_nextid++; |
1141 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1142 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1143 | oi->i_commit_size = inode->i_size = 0; | |
1144 | spin_lock(&sbi->s_next_gen_lock); | |
1145 | inode->i_generation = sbi->s_next_generation++; | |
1146 | spin_unlock(&sbi->s_next_gen_lock); | |
1147 | insert_inode_hash(inode); | |
1148 | ||
1149 | mark_inode_dirty(inode); | |
1150 | ||
45d3abcb | 1151 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
1152 | if (unlikely(ret)) { |
1153 | EXOFS_ERR("exofs_new_inode: exofs_get_io_state failed\n"); | |
1154 | return ERR_PTR(ret); | |
e6af00f1 BH |
1155 | } |
1156 | ||
06886a5a BH |
1157 | ios->obj.id = exofs_oi_objno(oi); |
1158 | exofs_make_credential(oi->i_cred, &ios->obj); | |
e6af00f1 BH |
1159 | |
1160 | /* increment the refcount so that the inode will still be around when we | |
1161 | * reach the callback | |
1162 | */ | |
1163 | atomic_inc(&inode->i_count); | |
1164 | ||
06886a5a BH |
1165 | ios->done = create_done; |
1166 | ios->private = inode; | |
1167 | ios->cred = oi->i_cred; | |
1168 | ret = exofs_sbi_create(ios); | |
e6af00f1 BH |
1169 | if (ret) { |
1170 | atomic_dec(&inode->i_count); | |
06886a5a BH |
1171 | exofs_put_io_state(ios); |
1172 | return ERR_PTR(ret); | |
e6af00f1 BH |
1173 | } |
1174 | atomic_inc(&sbi->s_curr_pending); | |
1175 | ||
1176 | return inode; | |
1177 | } | |
ba9e5e98 BH |
1178 | |
1179 | /* | |
1180 | * struct to pass two arguments to update_inode's callback | |
1181 | */ | |
1182 | struct updatei_args { | |
1183 | struct exofs_sb_info *sbi; | |
1184 | struct exofs_fcb fcb; | |
1185 | }; | |
1186 | ||
1187 | /* | |
1188 | * Callback function from exofs_update_inode(). | |
1189 | */ | |
06886a5a | 1190 | static void updatei_done(struct exofs_io_state *ios, void *p) |
ba9e5e98 BH |
1191 | { |
1192 | struct updatei_args *args = p; | |
1193 | ||
06886a5a | 1194 | exofs_put_io_state(ios); |
ba9e5e98 BH |
1195 | |
1196 | atomic_dec(&args->sbi->s_curr_pending); | |
1197 | ||
1198 | kfree(args); | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Write the inode to the OSD. Just fill up the struct, and set the attribute | |
1203 | * synchronously or asynchronously depending on the do_sync flag. | |
1204 | */ | |
1205 | static int exofs_update_inode(struct inode *inode, int do_sync) | |
1206 | { | |
1207 | struct exofs_i_info *oi = exofs_i(inode); | |
1208 | struct super_block *sb = inode->i_sb; | |
1209 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
06886a5a | 1210 | struct exofs_io_state *ios; |
ba9e5e98 BH |
1211 | struct osd_attr attr; |
1212 | struct exofs_fcb *fcb; | |
1213 | struct updatei_args *args; | |
1214 | int ret; | |
1215 | ||
1216 | args = kzalloc(sizeof(*args), GFP_KERNEL); | |
34ce4e7c BH |
1217 | if (!args) { |
1218 | EXOFS_DBGMSG("Faild kzalloc of args\n"); | |
ba9e5e98 | 1219 | return -ENOMEM; |
34ce4e7c | 1220 | } |
ba9e5e98 BH |
1221 | |
1222 | fcb = &args->fcb; | |
1223 | ||
1224 | fcb->i_mode = cpu_to_le16(inode->i_mode); | |
1225 | fcb->i_uid = cpu_to_le32(inode->i_uid); | |
1226 | fcb->i_gid = cpu_to_le32(inode->i_gid); | |
1227 | fcb->i_links_count = cpu_to_le16(inode->i_nlink); | |
1228 | fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); | |
1229 | fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec); | |
1230 | fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); | |
1231 | oi->i_commit_size = i_size_read(inode); | |
1232 | fcb->i_size = cpu_to_le64(oi->i_commit_size); | |
1233 | fcb->i_generation = cpu_to_le32(inode->i_generation); | |
1234 | ||
1235 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1236 | if (old_valid_dev(inode->i_rdev)) { | |
1237 | fcb->i_data[0] = | |
1238 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
1239 | fcb->i_data[1] = 0; | |
1240 | } else { | |
1241 | fcb->i_data[0] = 0; | |
1242 | fcb->i_data[1] = | |
1243 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
1244 | fcb->i_data[2] = 0; | |
1245 | } | |
1246 | } else | |
1247 | memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data)); | |
1248 | ||
45d3abcb | 1249 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
1250 | if (unlikely(ret)) { |
1251 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); | |
ba9e5e98 BH |
1252 | goto free_args; |
1253 | } | |
1254 | ||
ba9e5e98 BH |
1255 | attr = g_attr_inode_data; |
1256 | attr.val_ptr = fcb; | |
06886a5a BH |
1257 | ios->out_attr_len = 1; |
1258 | ios->out_attr = &attr; | |
ba9e5e98 BH |
1259 | |
1260 | if (!obj_created(oi)) { | |
1261 | EXOFS_DBGMSG("!obj_created\n"); | |
1262 | BUG_ON(!obj_2bcreated(oi)); | |
1263 | wait_event(oi->i_wq, obj_created(oi)); | |
1264 | EXOFS_DBGMSG("wait_event done\n"); | |
1265 | } | |
1266 | ||
06886a5a | 1267 | if (!do_sync) { |
ba9e5e98 | 1268 | args->sbi = sbi; |
06886a5a BH |
1269 | ios->done = updatei_done; |
1270 | ios->private = args; | |
1271 | } | |
ba9e5e98 | 1272 | |
06886a5a BH |
1273 | ret = exofs_oi_write(oi, ios); |
1274 | if (!do_sync && !ret) { | |
ba9e5e98 BH |
1275 | atomic_inc(&sbi->s_curr_pending); |
1276 | goto out; /* deallocation in updatei_done */ | |
1277 | } | |
1278 | ||
06886a5a | 1279 | exofs_put_io_state(ios); |
ba9e5e98 BH |
1280 | free_args: |
1281 | kfree(args); | |
1282 | out: | |
34ce4e7c BH |
1283 | EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n", |
1284 | inode->i_ino, do_sync, ret); | |
ba9e5e98 BH |
1285 | return ret; |
1286 | } | |
1287 | ||
a9185b41 | 1288 | int exofs_write_inode(struct inode *inode, struct writeback_control *wbc) |
ba9e5e98 | 1289 | { |
a9185b41 | 1290 | return exofs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
ba9e5e98 BH |
1291 | } |
1292 | ||
1293 | /* | |
1294 | * Callback function from exofs_delete_inode() - don't have much cleaning up to | |
1295 | * do. | |
1296 | */ | |
06886a5a | 1297 | static void delete_done(struct exofs_io_state *ios, void *p) |
ba9e5e98 | 1298 | { |
06886a5a BH |
1299 | struct exofs_sb_info *sbi = p; |
1300 | ||
1301 | exofs_put_io_state(ios); | |
1302 | ||
ba9e5e98 BH |
1303 | atomic_dec(&sbi->s_curr_pending); |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * Called when the refcount of an inode reaches zero. We remove the object | |
1308 | * from the OSD here. We make sure the object was created before we try and | |
1309 | * delete it. | |
1310 | */ | |
4ec70c9b | 1311 | void exofs_evict_inode(struct inode *inode) |
ba9e5e98 BH |
1312 | { |
1313 | struct exofs_i_info *oi = exofs_i(inode); | |
1314 | struct super_block *sb = inode->i_sb; | |
1315 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
06886a5a | 1316 | struct exofs_io_state *ios; |
ba9e5e98 BH |
1317 | int ret; |
1318 | ||
1319 | truncate_inode_pages(&inode->i_data, 0); | |
1320 | ||
2f246fd0 | 1321 | /* TODO: should do better here */ |
4ec70c9b | 1322 | if (inode->i_nlink || is_bad_inode(inode)) |
ba9e5e98 BH |
1323 | goto no_delete; |
1324 | ||
ba9e5e98 | 1325 | inode->i_size = 0; |
4ec70c9b | 1326 | end_writeback(inode); |
ba9e5e98 | 1327 | |
ba9e5e98 BH |
1328 | /* if we are deleting an obj that hasn't been created yet, wait */ |
1329 | if (!obj_created(oi)) { | |
1330 | BUG_ON(!obj_2bcreated(oi)); | |
1331 | wait_event(oi->i_wq, obj_created(oi)); | |
2f246fd0 BH |
1332 | /* ignore the error attempt a remove anyway */ |
1333 | } | |
1334 | ||
1335 | /* Now Remove the OSD objects */ | |
1336 | ret = exofs_get_io_state(&sbi->layout, &ios); | |
1337 | if (unlikely(ret)) { | |
1338 | EXOFS_ERR("%s: exofs_get_io_state failed\n", __func__); | |
1339 | return; | |
ba9e5e98 BH |
1340 | } |
1341 | ||
06886a5a BH |
1342 | ios->obj.id = exofs_oi_objno(oi); |
1343 | ios->done = delete_done; | |
1344 | ios->private = sbi; | |
1345 | ios->cred = oi->i_cred; | |
1346 | ret = exofs_sbi_remove(ios); | |
ba9e5e98 | 1347 | if (ret) { |
06886a5a BH |
1348 | EXOFS_ERR("%s: exofs_sbi_remove failed\n", __func__); |
1349 | exofs_put_io_state(ios); | |
ba9e5e98 BH |
1350 | return; |
1351 | } | |
1352 | atomic_inc(&sbi->s_curr_pending); | |
1353 | ||
1354 | return; | |
1355 | ||
1356 | no_delete: | |
4ec70c9b | 1357 | end_writeback(inode); |
ba9e5e98 | 1358 | } |