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 | ||
66cd6cad | 46 | unsigned exofs_max_io_pages(struct exofs_layout *layout, |
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; | |
06886a5a | 61 | struct exofs_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 BH |
112 | |
113 | if (!pcol->ios) { /* First time allocate io_state */ | |
45d3abcb | 114 | int ret = exofs_get_io_state(&pcol->sbi->layout, &pcol->ios); |
06886a5a BH |
115 | |
116 | if (ret) | |
117 | return ret; | |
118 | } | |
beaec07b | 119 | |
86093aaf | 120 | /* TODO: easily support bio chaining */ |
66cd6cad | 121 | pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages); |
86093aaf | 122 | |
beaec07b | 123 | for (; pages; pages >>= 1) { |
86093aaf BH |
124 | pcol->pages = kmalloc(pages * sizeof(struct page *), |
125 | GFP_KERNEL); | |
126 | if (likely(pcol->pages)) { | |
127 | pcol->alloc_pages = pages; | |
beaec07b | 128 | return 0; |
86093aaf | 129 | } |
beaec07b BH |
130 | } |
131 | ||
86093aaf | 132 | EXOFS_ERR("Failed to kmalloc expected_pages=%u\n", |
beaec07b BH |
133 | pcol->expected_pages); |
134 | return -ENOMEM; | |
135 | } | |
136 | ||
137 | static void pcol_free(struct page_collect *pcol) | |
138 | { | |
86093aaf BH |
139 | kfree(pcol->pages); |
140 | pcol->pages = NULL; | |
06886a5a BH |
141 | |
142 | if (pcol->ios) { | |
143 | exofs_put_io_state(pcol->ios); | |
144 | pcol->ios = NULL; | |
145 | } | |
beaec07b BH |
146 | } |
147 | ||
148 | static int pcol_add_page(struct page_collect *pcol, struct page *page, | |
149 | unsigned len) | |
150 | { | |
86093aaf | 151 | if (unlikely(pcol->nr_pages >= pcol->alloc_pages)) |
beaec07b BH |
152 | return -ENOMEM; |
153 | ||
86093aaf | 154 | pcol->pages[pcol->nr_pages++] = page; |
beaec07b BH |
155 | pcol->length += len; |
156 | return 0; | |
157 | } | |
158 | ||
159 | static int update_read_page(struct page *page, int ret) | |
160 | { | |
161 | if (ret == 0) { | |
162 | /* Everything is OK */ | |
163 | SetPageUptodate(page); | |
164 | if (PageError(page)) | |
165 | ClearPageError(page); | |
166 | } else if (ret == -EFAULT) { | |
167 | /* In this case we were trying to read something that wasn't on | |
168 | * disk yet - return a page full of zeroes. This should be OK, | |
169 | * because the object should be empty (if there was a write | |
170 | * before this read, the read would be waiting with the page | |
171 | * locked */ | |
172 | clear_highpage(page); | |
173 | ||
174 | SetPageUptodate(page); | |
175 | if (PageError(page)) | |
176 | ClearPageError(page); | |
177 | ret = 0; /* recovered error */ | |
178 | EXOFS_DBGMSG("recovered read error\n"); | |
179 | } else /* Error */ | |
180 | SetPageError(page); | |
181 | ||
182 | return ret; | |
183 | } | |
184 | ||
185 | static void update_write_page(struct page *page, int ret) | |
186 | { | |
187 | if (ret) { | |
188 | mapping_set_error(page->mapping, ret); | |
189 | SetPageError(page); | |
190 | } | |
191 | end_page_writeback(page); | |
192 | } | |
193 | ||
194 | /* Called at the end of reads, to optionally unlock pages and update their | |
195 | * status. | |
196 | */ | |
7aebf410 | 197 | static int __readpages_done(struct page_collect *pcol) |
beaec07b | 198 | { |
beaec07b BH |
199 | int i; |
200 | u64 resid; | |
201 | u64 good_bytes; | |
202 | u64 length = 0; | |
06886a5a | 203 | int ret = exofs_check_io(pcol->ios, &resid); |
beaec07b BH |
204 | |
205 | if (likely(!ret)) | |
206 | good_bytes = pcol->length; | |
beaec07b BH |
207 | else |
208 | good_bytes = pcol->length - resid; | |
209 | ||
34ce4e7c | 210 | EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
211 | " length=0x%lx nr_pages=%u\n", |
212 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
213 | pcol->nr_pages); | |
214 | ||
86093aaf BH |
215 | for (i = 0; i < pcol->nr_pages; i++) { |
216 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
217 | struct inode *inode = page->mapping->host; |
218 | int page_stat; | |
219 | ||
220 | if (inode != pcol->inode) | |
221 | continue; /* osd might add more pages at end */ | |
222 | ||
223 | if (likely(length < good_bytes)) | |
224 | page_stat = 0; | |
225 | else | |
226 | page_stat = ret; | |
227 | ||
fe33cc1e | 228 | EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n", |
beaec07b BH |
229 | inode->i_ino, page->index, |
230 | page_stat ? "bad_bytes" : "good_bytes"); | |
231 | ||
232 | ret = update_read_page(page, page_stat); | |
7aebf410 | 233 | if (!pcol->read_4_write) |
beaec07b | 234 | unlock_page(page); |
86093aaf | 235 | length += PAGE_SIZE; |
beaec07b BH |
236 | } |
237 | ||
238 | pcol_free(pcol); | |
34ce4e7c | 239 | EXOFS_DBGMSG2("readpages_done END\n"); |
beaec07b BH |
240 | return ret; |
241 | } | |
242 | ||
243 | /* callback of async reads */ | |
06886a5a | 244 | static void readpages_done(struct exofs_io_state *ios, void *p) |
beaec07b BH |
245 | { |
246 | struct page_collect *pcol = p; | |
247 | ||
7aebf410 | 248 | __readpages_done(pcol); |
beaec07b | 249 | atomic_dec(&pcol->sbi->s_curr_pending); |
06886a5a | 250 | kfree(pcol); |
beaec07b BH |
251 | } |
252 | ||
253 | static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw) | |
254 | { | |
beaec07b BH |
255 | int i; |
256 | ||
86093aaf BH |
257 | for (i = 0; i < pcol->nr_pages; i++) { |
258 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
259 | |
260 | if (rw == READ) | |
261 | update_read_page(page, ret); | |
262 | else | |
263 | update_write_page(page, ret); | |
264 | ||
265 | unlock_page(page); | |
266 | } | |
beaec07b BH |
267 | } |
268 | ||
7aebf410 | 269 | static int read_exec(struct page_collect *pcol) |
beaec07b BH |
270 | { |
271 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
06886a5a | 272 | struct exofs_io_state *ios = pcol->ios; |
beaec07b | 273 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
274 | int ret; |
275 | ||
86093aaf | 276 | if (!pcol->pages) |
beaec07b BH |
277 | return 0; |
278 | ||
86093aaf BH |
279 | ios->pages = pcol->pages; |
280 | ios->nr_pages = pcol->nr_pages; | |
06886a5a BH |
281 | ios->length = pcol->length; |
282 | ios->offset = pcol->pg_first << PAGE_CACHE_SHIFT; | |
beaec07b | 283 | |
7aebf410 | 284 | if (pcol->read_4_write) { |
06886a5a | 285 | exofs_oi_read(oi, pcol->ios); |
7aebf410 | 286 | return __readpages_done(pcol); |
beaec07b BH |
287 | } |
288 | ||
289 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); | |
290 | if (!pcol_copy) { | |
291 | ret = -ENOMEM; | |
292 | goto err; | |
293 | } | |
294 | ||
295 | *pcol_copy = *pcol; | |
06886a5a BH |
296 | ios->done = readpages_done; |
297 | ios->private = pcol_copy; | |
298 | ret = exofs_oi_read(oi, ios); | |
beaec07b BH |
299 | if (unlikely(ret)) |
300 | goto err; | |
301 | ||
302 | atomic_inc(&pcol->sbi->s_curr_pending); | |
303 | ||
34ce4e7c | 304 | EXOFS_DBGMSG2("read_exec obj=0x%llx start=0x%llx length=0x%lx\n", |
06886a5a | 305 | ios->obj.id, _LLU(ios->offset), pcol->length); |
beaec07b BH |
306 | |
307 | /* pages ownership was passed to pcol_copy */ | |
308 | _pcol_reset(pcol); | |
309 | return 0; | |
310 | ||
311 | err: | |
7aebf410 | 312 | if (!pcol->read_4_write) |
beaec07b | 313 | _unlock_pcol_pages(pcol, ret, READ); |
06886a5a BH |
314 | |
315 | pcol_free(pcol); | |
b76a3f93 | 316 | |
beaec07b | 317 | kfree(pcol_copy); |
beaec07b BH |
318 | return ret; |
319 | } | |
320 | ||
321 | /* readpage_strip is called either directly from readpage() or by the VFS from | |
322 | * within read_cache_pages(), to add one more page to be read. It will try to | |
323 | * collect as many contiguous pages as posible. If a discontinuity is | |
324 | * encountered, or it runs out of resources, it will submit the previous segment | |
325 | * and will start a new collection. Eventually caller must submit the last | |
326 | * segment if present. | |
327 | */ | |
328 | static int readpage_strip(void *data, struct page *page) | |
329 | { | |
330 | struct page_collect *pcol = data; | |
331 | struct inode *inode = pcol->inode; | |
332 | struct exofs_i_info *oi = exofs_i(inode); | |
333 | loff_t i_size = i_size_read(inode); | |
334 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
335 | size_t len; | |
336 | int ret; | |
337 | ||
338 | /* FIXME: Just for debugging, will be removed */ | |
339 | if (PageUptodate(page)) | |
340 | EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino, | |
341 | page->index); | |
342 | ||
343 | if (page->index < end_index) | |
344 | len = PAGE_CACHE_SIZE; | |
345 | else if (page->index == end_index) | |
346 | len = i_size & ~PAGE_CACHE_MASK; | |
347 | else | |
348 | len = 0; | |
349 | ||
350 | if (!len || !obj_created(oi)) { | |
351 | /* this will be out of bounds, or doesn't exist yet. | |
352 | * Current page is cleared and the request is split | |
353 | */ | |
354 | clear_highpage(page); | |
355 | ||
356 | SetPageUptodate(page); | |
357 | if (PageError(page)) | |
358 | ClearPageError(page); | |
359 | ||
f17b1f9f BH |
360 | if (!pcol->read_4_write) |
361 | unlock_page(page); | |
a8f1418f BH |
362 | EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx " |
363 | "read_4_write=%d index=0x%lx end_index=0x%lx " | |
364 | "splitting\n", inode->i_ino, len, | |
365 | pcol->read_4_write, page->index, end_index); | |
beaec07b | 366 | |
7aebf410 | 367 | return read_exec(pcol); |
beaec07b BH |
368 | } |
369 | ||
370 | try_again: | |
371 | ||
372 | if (unlikely(pcol->pg_first == -1)) { | |
373 | pcol->pg_first = page->index; | |
374 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
375 | page->index)) { | |
376 | /* Discontinuity detected, split the request */ | |
7aebf410 | 377 | ret = read_exec(pcol); |
beaec07b BH |
378 | if (unlikely(ret)) |
379 | goto fail; | |
380 | goto try_again; | |
381 | } | |
382 | ||
86093aaf | 383 | if (!pcol->pages) { |
beaec07b BH |
384 | ret = pcol_try_alloc(pcol); |
385 | if (unlikely(ret)) | |
386 | goto fail; | |
387 | } | |
388 | ||
389 | if (len != PAGE_CACHE_SIZE) | |
390 | zero_user(page, len, PAGE_CACHE_SIZE - len); | |
391 | ||
fe33cc1e | 392 | EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
393 | inode->i_ino, page->index, len); |
394 | ||
395 | ret = pcol_add_page(pcol, page, len); | |
396 | if (ret) { | |
fe33cc1e | 397 | EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p " |
beaec07b BH |
398 | "this_len=0x%zx nr_pages=%u length=0x%lx\n", |
399 | page, len, pcol->nr_pages, pcol->length); | |
400 | ||
401 | /* split the request, and start again with current page */ | |
7aebf410 | 402 | ret = read_exec(pcol); |
beaec07b BH |
403 | if (unlikely(ret)) |
404 | goto fail; | |
405 | ||
406 | goto try_again; | |
407 | } | |
408 | ||
409 | return 0; | |
410 | ||
411 | fail: | |
412 | /* SetPageError(page); ??? */ | |
413 | unlock_page(page); | |
414 | return ret; | |
415 | } | |
416 | ||
417 | static int exofs_readpages(struct file *file, struct address_space *mapping, | |
418 | struct list_head *pages, unsigned nr_pages) | |
419 | { | |
420 | struct page_collect pcol; | |
421 | int ret; | |
422 | ||
423 | _pcol_init(&pcol, nr_pages, mapping->host); | |
424 | ||
425 | ret = read_cache_pages(mapping, pages, readpage_strip, &pcol); | |
426 | if (ret) { | |
427 | EXOFS_ERR("read_cache_pages => %d\n", ret); | |
428 | return ret; | |
429 | } | |
430 | ||
7aebf410 | 431 | return read_exec(&pcol); |
beaec07b BH |
432 | } |
433 | ||
7aebf410 | 434 | static int _readpage(struct page *page, bool read_4_write) |
beaec07b BH |
435 | { |
436 | struct page_collect pcol; | |
437 | int ret; | |
438 | ||
439 | _pcol_init(&pcol, 1, page->mapping->host); | |
440 | ||
7aebf410 | 441 | pcol.read_4_write = read_4_write; |
beaec07b BH |
442 | ret = readpage_strip(&pcol, page); |
443 | if (ret) { | |
444 | EXOFS_ERR("_readpage => %d\n", ret); | |
445 | return ret; | |
446 | } | |
447 | ||
7aebf410 | 448 | return read_exec(&pcol); |
beaec07b BH |
449 | } |
450 | ||
451 | /* | |
452 | * We don't need the file | |
453 | */ | |
454 | static int exofs_readpage(struct file *file, struct page *page) | |
455 | { | |
456 | return _readpage(page, false); | |
457 | } | |
458 | ||
06886a5a BH |
459 | /* Callback for osd_write. All writes are asynchronous */ |
460 | static void writepages_done(struct exofs_io_state *ios, void *p) | |
beaec07b BH |
461 | { |
462 | struct page_collect *pcol = p; | |
beaec07b BH |
463 | int i; |
464 | u64 resid; | |
465 | u64 good_bytes; | |
466 | u64 length = 0; | |
06886a5a | 467 | int ret = exofs_check_io(ios, &resid); |
beaec07b | 468 | |
beaec07b BH |
469 | atomic_dec(&pcol->sbi->s_curr_pending); |
470 | ||
471 | if (likely(!ret)) | |
472 | good_bytes = pcol->length; | |
beaec07b BH |
473 | else |
474 | good_bytes = pcol->length - resid; | |
475 | ||
34ce4e7c | 476 | EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
477 | " length=0x%lx nr_pages=%u\n", |
478 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
479 | pcol->nr_pages); | |
480 | ||
86093aaf BH |
481 | for (i = 0; i < pcol->nr_pages; i++) { |
482 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
483 | struct inode *inode = page->mapping->host; |
484 | int page_stat; | |
485 | ||
486 | if (inode != pcol->inode) | |
487 | continue; /* osd might add more pages to a bio */ | |
488 | ||
489 | if (likely(length < good_bytes)) | |
490 | page_stat = 0; | |
491 | else | |
492 | page_stat = ret; | |
493 | ||
494 | update_write_page(page, page_stat); | |
495 | unlock_page(page); | |
fe33cc1e | 496 | EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n", |
beaec07b BH |
497 | inode->i_ino, page->index, page_stat); |
498 | ||
86093aaf | 499 | length += PAGE_SIZE; |
beaec07b BH |
500 | } |
501 | ||
502 | pcol_free(pcol); | |
503 | kfree(pcol); | |
34ce4e7c | 504 | EXOFS_DBGMSG2("writepages_done END\n"); |
beaec07b BH |
505 | } |
506 | ||
507 | static int write_exec(struct page_collect *pcol) | |
508 | { | |
509 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
06886a5a | 510 | struct exofs_io_state *ios = pcol->ios; |
beaec07b | 511 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
512 | int ret; |
513 | ||
86093aaf | 514 | if (!pcol->pages) |
beaec07b BH |
515 | return 0; |
516 | ||
beaec07b BH |
517 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
518 | if (!pcol_copy) { | |
571f7f46 | 519 | EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n"); |
beaec07b BH |
520 | ret = -ENOMEM; |
521 | goto err; | |
522 | } | |
523 | ||
524 | *pcol_copy = *pcol; | |
525 | ||
86093aaf BH |
526 | ios->pages = pcol_copy->pages; |
527 | ios->nr_pages = pcol_copy->nr_pages; | |
06886a5a BH |
528 | ios->offset = pcol_copy->pg_first << PAGE_CACHE_SHIFT; |
529 | ios->length = pcol_copy->length; | |
530 | ios->done = writepages_done; | |
531 | ios->private = pcol_copy; | |
532 | ||
533 | ret = exofs_oi_write(oi, ios); | |
beaec07b | 534 | if (unlikely(ret)) { |
571f7f46 | 535 | EXOFS_ERR("write_exec: exofs_oi_write() Failed\n"); |
beaec07b BH |
536 | goto err; |
537 | } | |
538 | ||
539 | atomic_inc(&pcol->sbi->s_curr_pending); | |
34ce4e7c | 540 | EXOFS_DBGMSG2("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n", |
06886a5a | 541 | pcol->inode->i_ino, pcol->pg_first, _LLU(ios->offset), |
beaec07b BH |
542 | pcol->length); |
543 | /* pages ownership was passed to pcol_copy */ | |
544 | _pcol_reset(pcol); | |
545 | return 0; | |
546 | ||
547 | err: | |
548 | _unlock_pcol_pages(pcol, ret, WRITE); | |
06886a5a | 549 | pcol_free(pcol); |
beaec07b | 550 | kfree(pcol_copy); |
06886a5a | 551 | |
beaec07b BH |
552 | return ret; |
553 | } | |
554 | ||
555 | /* writepage_strip is called either directly from writepage() or by the VFS from | |
556 | * within write_cache_pages(), to add one more page to be written to storage. | |
557 | * It will try to collect as many contiguous pages as possible. If a | |
558 | * discontinuity is encountered or it runs out of resources it will submit the | |
559 | * previous segment and will start a new collection. | |
560 | * Eventually caller must submit the last segment if present. | |
561 | */ | |
562 | static int writepage_strip(struct page *page, | |
563 | struct writeback_control *wbc_unused, void *data) | |
564 | { | |
565 | struct page_collect *pcol = data; | |
566 | struct inode *inode = pcol->inode; | |
567 | struct exofs_i_info *oi = exofs_i(inode); | |
568 | loff_t i_size = i_size_read(inode); | |
569 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
570 | size_t len; | |
571 | int ret; | |
572 | ||
573 | BUG_ON(!PageLocked(page)); | |
574 | ||
575 | ret = wait_obj_created(oi); | |
576 | if (unlikely(ret)) | |
577 | goto fail; | |
578 | ||
579 | if (page->index < end_index) | |
580 | /* in this case, the page is within the limits of the file */ | |
581 | len = PAGE_CACHE_SIZE; | |
582 | else { | |
583 | len = i_size & ~PAGE_CACHE_MASK; | |
584 | ||
585 | if (page->index > end_index || !len) { | |
586 | /* in this case, the page is outside the limits | |
587 | * (truncate in progress) | |
588 | */ | |
589 | ret = write_exec(pcol); | |
590 | if (unlikely(ret)) | |
591 | goto fail; | |
592 | if (PageError(page)) | |
593 | ClearPageError(page); | |
594 | unlock_page(page); | |
06886a5a BH |
595 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) " |
596 | "outside the limits\n", | |
597 | inode->i_ino, page->index); | |
beaec07b BH |
598 | return 0; |
599 | } | |
600 | } | |
601 | ||
602 | try_again: | |
603 | ||
604 | if (unlikely(pcol->pg_first == -1)) { | |
605 | pcol->pg_first = page->index; | |
606 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
607 | page->index)) { | |
608 | /* Discontinuity detected, split the request */ | |
609 | ret = write_exec(pcol); | |
610 | if (unlikely(ret)) | |
611 | goto fail; | |
06886a5a BH |
612 | |
613 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n", | |
614 | inode->i_ino, page->index); | |
beaec07b BH |
615 | goto try_again; |
616 | } | |
617 | ||
86093aaf | 618 | if (!pcol->pages) { |
beaec07b BH |
619 | ret = pcol_try_alloc(pcol); |
620 | if (unlikely(ret)) | |
621 | goto fail; | |
622 | } | |
623 | ||
fe33cc1e | 624 | EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
625 | inode->i_ino, page->index, len); |
626 | ||
627 | ret = pcol_add_page(pcol, page, len); | |
628 | if (unlikely(ret)) { | |
34ce4e7c | 629 | EXOFS_DBGMSG2("Failed pcol_add_page " |
beaec07b BH |
630 | "nr_pages=%u total_length=0x%lx\n", |
631 | pcol->nr_pages, pcol->length); | |
632 | ||
633 | /* split the request, next loop will start again */ | |
634 | ret = write_exec(pcol); | |
635 | if (unlikely(ret)) { | |
571f7f46 | 636 | EXOFS_DBGMSG("write_exec failed => %d", ret); |
beaec07b BH |
637 | goto fail; |
638 | } | |
639 | ||
640 | goto try_again; | |
641 | } | |
642 | ||
643 | BUG_ON(PageWriteback(page)); | |
644 | set_page_writeback(page); | |
645 | ||
646 | return 0; | |
647 | ||
648 | fail: | |
06886a5a BH |
649 | EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n", |
650 | inode->i_ino, page->index, ret); | |
beaec07b BH |
651 | set_bit(AS_EIO, &page->mapping->flags); |
652 | unlock_page(page); | |
653 | return ret; | |
654 | } | |
655 | ||
656 | static int exofs_writepages(struct address_space *mapping, | |
657 | struct writeback_control *wbc) | |
658 | { | |
659 | struct page_collect pcol; | |
660 | long start, end, expected_pages; | |
661 | int ret; | |
662 | ||
663 | start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
664 | end = (wbc->range_end == LLONG_MAX) ? | |
665 | start + mapping->nrpages : | |
666 | wbc->range_end >> PAGE_CACHE_SHIFT; | |
667 | ||
668 | if (start || end) | |
06886a5a | 669 | expected_pages = end - start + 1; |
beaec07b BH |
670 | else |
671 | expected_pages = mapping->nrpages; | |
672 | ||
06886a5a BH |
673 | if (expected_pages < 32L) |
674 | expected_pages = 32L; | |
675 | ||
34ce4e7c | 676 | EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx " |
06886a5a | 677 | "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n", |
beaec07b | 678 | mapping->host->i_ino, wbc->range_start, wbc->range_end, |
06886a5a | 679 | mapping->nrpages, start, end, expected_pages); |
beaec07b BH |
680 | |
681 | _pcol_init(&pcol, expected_pages, mapping->host); | |
682 | ||
683 | ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); | |
684 | if (ret) { | |
685 | EXOFS_ERR("write_cache_pages => %d\n", ret); | |
686 | return ret; | |
687 | } | |
688 | ||
689 | return write_exec(&pcol); | |
690 | } | |
691 | ||
692 | static int exofs_writepage(struct page *page, struct writeback_control *wbc) | |
693 | { | |
694 | struct page_collect pcol; | |
695 | int ret; | |
696 | ||
697 | _pcol_init(&pcol, 1, page->mapping->host); | |
698 | ||
699 | ret = writepage_strip(page, NULL, &pcol); | |
700 | if (ret) { | |
701 | EXOFS_ERR("exofs_writepage => %d\n", ret); | |
702 | return ret; | |
703 | } | |
704 | ||
705 | return write_exec(&pcol); | |
706 | } | |
707 | ||
2f246fd0 BH |
708 | /* i_mutex held using inode->i_size directly */ |
709 | static void _write_failed(struct inode *inode, loff_t to) | |
710 | { | |
711 | if (to > inode->i_size) | |
712 | truncate_pagecache(inode, to, inode->i_size); | |
713 | } | |
714 | ||
beaec07b BH |
715 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
716 | loff_t pos, unsigned len, unsigned flags, | |
717 | struct page **pagep, void **fsdata) | |
718 | { | |
719 | int ret = 0; | |
720 | struct page *page; | |
721 | ||
722 | page = *pagep; | |
723 | if (page == NULL) { | |
724 | ret = simple_write_begin(file, mapping, pos, len, flags, pagep, | |
725 | fsdata); | |
726 | if (ret) { | |
571f7f46 | 727 | EXOFS_DBGMSG("simple_write_begin failed\n"); |
2f246fd0 | 728 | goto out; |
beaec07b BH |
729 | } |
730 | ||
731 | page = *pagep; | |
732 | } | |
733 | ||
734 | /* read modify write */ | |
735 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { | |
a8f1418f BH |
736 | loff_t i_size = i_size_read(mapping->host); |
737 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
738 | size_t rlen; | |
739 | ||
740 | if (page->index < end_index) | |
741 | rlen = PAGE_CACHE_SIZE; | |
742 | else if (page->index == end_index) | |
743 | rlen = i_size & ~PAGE_CACHE_MASK; | |
744 | else | |
745 | rlen = 0; | |
746 | ||
747 | if (!rlen) { | |
748 | clear_highpage(page); | |
749 | SetPageUptodate(page); | |
750 | goto out; | |
751 | } | |
752 | ||
beaec07b BH |
753 | ret = _readpage(page, true); |
754 | if (ret) { | |
755 | /*SetPageError was done by _readpage. Is it ok?*/ | |
756 | unlock_page(page); | |
a8f1418f | 757 | EXOFS_DBGMSG("__readpage failed\n"); |
beaec07b BH |
758 | } |
759 | } | |
2f246fd0 BH |
760 | out: |
761 | if (unlikely(ret)) | |
762 | _write_failed(mapping->host, pos + len); | |
beaec07b BH |
763 | |
764 | return ret; | |
765 | } | |
766 | ||
767 | static int exofs_write_begin_export(struct file *file, | |
768 | struct address_space *mapping, | |
769 | loff_t pos, unsigned len, unsigned flags, | |
770 | struct page **pagep, void **fsdata) | |
771 | { | |
772 | *pagep = NULL; | |
773 | ||
774 | return exofs_write_begin(file, mapping, pos, len, flags, pagep, | |
775 | fsdata); | |
776 | } | |
777 | ||
efd124b9 BH |
778 | static int exofs_write_end(struct file *file, struct address_space *mapping, |
779 | loff_t pos, unsigned len, unsigned copied, | |
780 | struct page *page, void *fsdata) | |
781 | { | |
782 | struct inode *inode = mapping->host; | |
783 | /* According to comment in simple_write_end i_mutex is held */ | |
784 | loff_t i_size = inode->i_size; | |
785 | int ret; | |
786 | ||
787 | ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata); | |
2f246fd0 BH |
788 | if (unlikely(ret)) |
789 | _write_failed(inode, pos + len); | |
790 | ||
791 | /* TODO: once simple_write_end marks inode dirty remove */ | |
efd124b9 BH |
792 | if (i_size != inode->i_size) |
793 | mark_inode_dirty(inode); | |
794 | return ret; | |
795 | } | |
796 | ||
200b0700 BH |
797 | static int exofs_releasepage(struct page *page, gfp_t gfp) |
798 | { | |
799 | EXOFS_DBGMSG("page 0x%lx\n", page->index); | |
800 | WARN_ON(1); | |
85dc7878 | 801 | return 0; |
200b0700 BH |
802 | } |
803 | ||
804 | static void exofs_invalidatepage(struct page *page, unsigned long offset) | |
805 | { | |
85dc7878 | 806 | EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset); |
200b0700 | 807 | WARN_ON(1); |
200b0700 BH |
808 | } |
809 | ||
beaec07b BH |
810 | const struct address_space_operations exofs_aops = { |
811 | .readpage = exofs_readpage, | |
812 | .readpages = exofs_readpages, | |
813 | .writepage = exofs_writepage, | |
814 | .writepages = exofs_writepages, | |
815 | .write_begin = exofs_write_begin_export, | |
efd124b9 | 816 | .write_end = exofs_write_end, |
200b0700 BH |
817 | .releasepage = exofs_releasepage, |
818 | .set_page_dirty = __set_page_dirty_nobuffers, | |
819 | .invalidatepage = exofs_invalidatepage, | |
820 | ||
821 | /* Not implemented Yet */ | |
822 | .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */ | |
823 | .direct_IO = NULL, /* TODO: Should be trivial to do */ | |
824 | ||
825 | /* With these NULL has special meaning or default is not exported */ | |
826 | .sync_page = NULL, | |
827 | .get_xip_mem = NULL, | |
828 | .migratepage = NULL, | |
829 | .launder_page = NULL, | |
830 | .is_partially_uptodate = NULL, | |
831 | .error_remove_page = NULL, | |
beaec07b BH |
832 | }; |
833 | ||
e8062719 BH |
834 | /****************************************************************************** |
835 | * INODE OPERATIONS | |
836 | *****************************************************************************/ | |
837 | ||
838 | /* | |
839 | * Test whether an inode is a fast symlink. | |
840 | */ | |
841 | static inline int exofs_inode_is_fast_symlink(struct inode *inode) | |
842 | { | |
843 | struct exofs_i_info *oi = exofs_i(inode); | |
844 | ||
845 | return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); | |
846 | } | |
847 | ||
e8062719 BH |
848 | const struct osd_attr g_attr_logical_length = ATTR_DEF( |
849 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); | |
850 | ||
2f246fd0 | 851 | static int _do_truncate(struct inode *inode, loff_t newsize) |
06886a5a BH |
852 | { |
853 | struct exofs_i_info *oi = exofs_i(inode); | |
06886a5a BH |
854 | int ret; |
855 | ||
856 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
857 | ||
2f246fd0 BH |
858 | ret = exofs_oi_truncate(oi, (u64)newsize); |
859 | if (likely(!ret)) | |
860 | truncate_setsize(inode, newsize); | |
06886a5a | 861 | |
2f246fd0 BH |
862 | EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n", |
863 | inode->i_ino, newsize, ret); | |
06886a5a BH |
864 | return ret; |
865 | } | |
866 | ||
e8062719 | 867 | /* |
2f246fd0 BH |
868 | * Set inode attributes - update size attribute on OSD if needed, |
869 | * otherwise just call generic functions. | |
e8062719 BH |
870 | */ |
871 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) | |
872 | { | |
873 | struct inode *inode = dentry->d_inode; | |
874 | int error; | |
875 | ||
2f246fd0 BH |
876 | /* if we are about to modify an object, and it hasn't been |
877 | * created yet, wait | |
878 | */ | |
879 | error = wait_obj_created(exofs_i(inode)); | |
880 | if (unlikely(error)) | |
881 | return error; | |
882 | ||
e8062719 | 883 | error = inode_change_ok(inode, iattr); |
2f246fd0 | 884 | if (unlikely(error)) |
e8062719 BH |
885 | return error; |
886 | ||
1025774c CH |
887 | if ((iattr->ia_valid & ATTR_SIZE) && |
888 | iattr->ia_size != i_size_read(inode)) { | |
2f246fd0 BH |
889 | error = _do_truncate(inode, iattr->ia_size); |
890 | if (unlikely(error)) | |
1025774c CH |
891 | return error; |
892 | } | |
893 | ||
894 | setattr_copy(inode, iattr); | |
895 | mark_inode_dirty(inode); | |
896 | return 0; | |
e8062719 | 897 | } |
e6af00f1 | 898 | |
d9c740d2 BH |
899 | static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF( |
900 | EXOFS_APAGE_FS_DATA, | |
901 | EXOFS_ATTR_INODE_FILE_LAYOUT, | |
902 | 0); | |
903 | static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF( | |
904 | EXOFS_APAGE_FS_DATA, | |
905 | EXOFS_ATTR_INODE_DIR_LAYOUT, | |
906 | 0); | |
907 | ||
e6af00f1 | 908 | /* |
5d952b83 BH |
909 | * Read the Linux inode info from the OSD, and return it as is. In exofs the |
910 | * inode info is in an application specific page/attribute of the osd-object. | |
e6af00f1 BH |
911 | */ |
912 | static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, | |
5d952b83 | 913 | struct exofs_fcb *inode) |
e6af00f1 BH |
914 | { |
915 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
d9c740d2 BH |
916 | struct osd_attr attrs[] = { |
917 | [0] = g_attr_inode_data, | |
918 | [1] = g_attr_inode_file_layout, | |
919 | [2] = g_attr_inode_dir_layout, | |
d9c740d2 | 920 | }; |
06886a5a | 921 | struct exofs_io_state *ios; |
d9c740d2 | 922 | struct exofs_on_disk_inode_layout *layout; |
e6af00f1 BH |
923 | int ret; |
924 | ||
45d3abcb | 925 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
926 | if (unlikely(ret)) { |
927 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); | |
928 | return ret; | |
e6af00f1 | 929 | } |
e6af00f1 | 930 | |
06886a5a BH |
931 | ios->obj.id = exofs_oi_objno(oi); |
932 | exofs_make_credential(oi->i_cred, &ios->obj); | |
933 | ios->cred = oi->i_cred; | |
e6af00f1 | 934 | |
d9c740d2 BH |
935 | attrs[1].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs); |
936 | attrs[2].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs); | |
937 | ||
06886a5a BH |
938 | ios->in_attr = attrs; |
939 | ios->in_attr_len = ARRAY_SIZE(attrs); | |
e6af00f1 | 940 | |
06886a5a | 941 | ret = exofs_sbi_read(ios); |
96391e2b BH |
942 | if (unlikely(ret)) { |
943 | EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n", | |
944 | _LLU(ios->obj.id), ret); | |
945 | memset(inode, 0, sizeof(*inode)); | |
946 | inode->i_mode = 0040000 | (0777 & ~022); | |
947 | /* If object is lost on target we might as well enable it's | |
948 | * delete. | |
949 | */ | |
950 | if ((ret == -ENOENT) || (ret == -EINVAL)) | |
951 | ret = 0; | |
e6af00f1 | 952 | goto out; |
96391e2b | 953 | } |
e6af00f1 | 954 | |
06886a5a | 955 | ret = extract_attr_from_ios(ios, &attrs[0]); |
e6af00f1 | 956 | if (ret) { |
06886a5a | 957 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
e6af00f1 BH |
958 | goto out; |
959 | } | |
06886a5a BH |
960 | WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE); |
961 | memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE); | |
e6af00f1 | 962 | |
06886a5a | 963 | ret = extract_attr_from_ios(ios, &attrs[1]); |
d9c740d2 BH |
964 | if (ret) { |
965 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
966 | goto out; | |
967 | } | |
968 | if (attrs[1].len) { | |
969 | layout = attrs[1].val_ptr; | |
970 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
971 | EXOFS_ERR("%s: unsupported files layout %d\n", | |
972 | __func__, layout->gen_func); | |
973 | ret = -ENOTSUPP; | |
974 | goto out; | |
975 | } | |
976 | } | |
977 | ||
978 | ret = extract_attr_from_ios(ios, &attrs[2]); | |
979 | if (ret) { | |
980 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
981 | goto out; | |
982 | } | |
983 | if (attrs[2].len) { | |
984 | layout = attrs[2].val_ptr; | |
985 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
986 | EXOFS_ERR("%s: unsupported meta-data layout %d\n", | |
987 | __func__, layout->gen_func); | |
988 | ret = -ENOTSUPP; | |
989 | goto out; | |
990 | } | |
991 | } | |
992 | ||
e6af00f1 | 993 | out: |
06886a5a | 994 | exofs_put_io_state(ios); |
e6af00f1 BH |
995 | return ret; |
996 | } | |
997 | ||
9cfdc7aa BH |
998 | static void __oi_init(struct exofs_i_info *oi) |
999 | { | |
1000 | init_waitqueue_head(&oi->i_wq); | |
1001 | oi->i_flags = 0; | |
1002 | } | |
e6af00f1 BH |
1003 | /* |
1004 | * Fill in an inode read from the OSD and set it up for use | |
1005 | */ | |
1006 | struct inode *exofs_iget(struct super_block *sb, unsigned long ino) | |
1007 | { | |
1008 | struct exofs_i_info *oi; | |
1009 | struct exofs_fcb fcb; | |
1010 | struct inode *inode; | |
e6af00f1 BH |
1011 | int ret; |
1012 | ||
1013 | inode = iget_locked(sb, ino); | |
1014 | if (!inode) | |
1015 | return ERR_PTR(-ENOMEM); | |
1016 | if (!(inode->i_state & I_NEW)) | |
1017 | return inode; | |
1018 | oi = exofs_i(inode); | |
9cfdc7aa | 1019 | __oi_init(oi); |
e6af00f1 BH |
1020 | |
1021 | /* read the inode from the osd */ | |
5d952b83 | 1022 | ret = exofs_get_inode(sb, oi, &fcb); |
e6af00f1 BH |
1023 | if (ret) |
1024 | goto bad_inode; | |
1025 | ||
e6af00f1 BH |
1026 | set_obj_created(oi); |
1027 | ||
1028 | /* copy stuff from on-disk struct to in-memory struct */ | |
1029 | inode->i_mode = le16_to_cpu(fcb.i_mode); | |
1030 | inode->i_uid = le32_to_cpu(fcb.i_uid); | |
1031 | inode->i_gid = le32_to_cpu(fcb.i_gid); | |
1032 | inode->i_nlink = le16_to_cpu(fcb.i_links_count); | |
1033 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime); | |
1034 | inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime); | |
1035 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime); | |
1036 | inode->i_ctime.tv_nsec = | |
1037 | inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0; | |
1038 | oi->i_commit_size = le64_to_cpu(fcb.i_size); | |
1039 | i_size_write(inode, oi->i_commit_size); | |
1040 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1041 | inode->i_generation = le32_to_cpu(fcb.i_generation); | |
1042 | ||
e6af00f1 BH |
1043 | oi->i_dir_start_lookup = 0; |
1044 | ||
1045 | if ((inode->i_nlink == 0) && (inode->i_mode == 0)) { | |
1046 | ret = -ESTALE; | |
1047 | goto bad_inode; | |
1048 | } | |
1049 | ||
1050 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1051 | if (fcb.i_data[0]) | |
1052 | inode->i_rdev = | |
1053 | old_decode_dev(le32_to_cpu(fcb.i_data[0])); | |
1054 | else | |
1055 | inode->i_rdev = | |
1056 | new_decode_dev(le32_to_cpu(fcb.i_data[1])); | |
1057 | } else { | |
1058 | memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); | |
1059 | } | |
1060 | ||
66cd6cad | 1061 | inode->i_mapping->backing_dev_info = sb->s_bdi; |
e6af00f1 BH |
1062 | if (S_ISREG(inode->i_mode)) { |
1063 | inode->i_op = &exofs_file_inode_operations; | |
1064 | inode->i_fop = &exofs_file_operations; | |
1065 | inode->i_mapping->a_ops = &exofs_aops; | |
1066 | } else if (S_ISDIR(inode->i_mode)) { | |
1067 | inode->i_op = &exofs_dir_inode_operations; | |
1068 | inode->i_fop = &exofs_dir_operations; | |
1069 | inode->i_mapping->a_ops = &exofs_aops; | |
1070 | } else if (S_ISLNK(inode->i_mode)) { | |
1071 | if (exofs_inode_is_fast_symlink(inode)) | |
1072 | inode->i_op = &exofs_fast_symlink_inode_operations; | |
1073 | else { | |
1074 | inode->i_op = &exofs_symlink_inode_operations; | |
1075 | inode->i_mapping->a_ops = &exofs_aops; | |
1076 | } | |
1077 | } else { | |
1078 | inode->i_op = &exofs_special_inode_operations; | |
1079 | if (fcb.i_data[0]) | |
1080 | init_special_inode(inode, inode->i_mode, | |
1081 | old_decode_dev(le32_to_cpu(fcb.i_data[0]))); | |
1082 | else | |
1083 | init_special_inode(inode, inode->i_mode, | |
1084 | new_decode_dev(le32_to_cpu(fcb.i_data[1]))); | |
1085 | } | |
1086 | ||
1087 | unlock_new_inode(inode); | |
1088 | return inode; | |
1089 | ||
1090 | bad_inode: | |
1091 | iget_failed(inode); | |
1092 | return ERR_PTR(ret); | |
1093 | } | |
1094 | ||
1095 | int __exofs_wait_obj_created(struct exofs_i_info *oi) | |
1096 | { | |
1097 | if (!obj_created(oi)) { | |
fe2fd9ed | 1098 | EXOFS_DBGMSG("!obj_created\n"); |
e6af00f1 BH |
1099 | BUG_ON(!obj_2bcreated(oi)); |
1100 | wait_event(oi->i_wq, obj_created(oi)); | |
fe2fd9ed | 1101 | EXOFS_DBGMSG("wait_event done\n"); |
e6af00f1 BH |
1102 | } |
1103 | return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; | |
1104 | } | |
1105 | /* | |
1106 | * Callback function from exofs_new_inode(). The important thing is that we | |
1107 | * set the obj_created flag so that other methods know that the object exists on | |
1108 | * the OSD. | |
1109 | */ | |
06886a5a | 1110 | static void create_done(struct exofs_io_state *ios, void *p) |
e6af00f1 BH |
1111 | { |
1112 | struct inode *inode = p; | |
1113 | struct exofs_i_info *oi = exofs_i(inode); | |
1114 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
1115 | int ret; | |
1116 | ||
06886a5a BH |
1117 | ret = exofs_check_io(ios, NULL); |
1118 | exofs_put_io_state(ios); | |
1119 | ||
e6af00f1 BH |
1120 | atomic_dec(&sbi->s_curr_pending); |
1121 | ||
1122 | if (unlikely(ret)) { | |
571f7f46 | 1123 | EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx", |
45d3abcb | 1124 | _LLU(exofs_oi_objno(oi)), _LLU(sbi->layout.s_pid)); |
06886a5a BH |
1125 | /*TODO: When FS is corrupted creation can fail, object already |
1126 | * exist. Get rid of this asynchronous creation, if exist | |
1127 | * increment the obj counter and try the next object. Until we | |
1128 | * succeed. All these dangling objects will be made into lost | |
1129 | * files by chkfs.exofs | |
1130 | */ | |
1131 | } | |
1132 | ||
1133 | set_obj_created(oi); | |
e6af00f1 | 1134 | |
e6af00f1 BH |
1135 | wake_up(&oi->i_wq); |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Set up a new inode and create an object for it on the OSD | |
1140 | */ | |
1141 | struct inode *exofs_new_inode(struct inode *dir, int mode) | |
1142 | { | |
1143 | struct super_block *sb; | |
1144 | struct inode *inode; | |
1145 | struct exofs_i_info *oi; | |
1146 | struct exofs_sb_info *sbi; | |
06886a5a | 1147 | struct exofs_io_state *ios; |
e6af00f1 BH |
1148 | int ret; |
1149 | ||
1150 | sb = dir->i_sb; | |
1151 | inode = new_inode(sb); | |
1152 | if (!inode) | |
1153 | return ERR_PTR(-ENOMEM); | |
1154 | ||
1155 | oi = exofs_i(inode); | |
9cfdc7aa | 1156 | __oi_init(oi); |
e6af00f1 | 1157 | |
e6af00f1 BH |
1158 | set_obj_2bcreated(oi); |
1159 | ||
1160 | sbi = sb->s_fs_info; | |
1161 | ||
66cd6cad | 1162 | inode->i_mapping->backing_dev_info = sb->s_bdi; |
e6af00f1 | 1163 | sb->s_dirt = 1; |
e00117f1 | 1164 | inode_init_owner(inode, dir, mode); |
e6af00f1 BH |
1165 | inode->i_ino = sbi->s_nextid++; |
1166 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1167 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1168 | oi->i_commit_size = inode->i_size = 0; | |
1169 | spin_lock(&sbi->s_next_gen_lock); | |
1170 | inode->i_generation = sbi->s_next_generation++; | |
1171 | spin_unlock(&sbi->s_next_gen_lock); | |
1172 | insert_inode_hash(inode); | |
1173 | ||
1174 | mark_inode_dirty(inode); | |
1175 | ||
45d3abcb | 1176 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
1177 | if (unlikely(ret)) { |
1178 | EXOFS_ERR("exofs_new_inode: exofs_get_io_state failed\n"); | |
1179 | return ERR_PTR(ret); | |
e6af00f1 BH |
1180 | } |
1181 | ||
06886a5a BH |
1182 | ios->obj.id = exofs_oi_objno(oi); |
1183 | exofs_make_credential(oi->i_cred, &ios->obj); | |
e6af00f1 | 1184 | |
06886a5a BH |
1185 | ios->done = create_done; |
1186 | ios->private = inode; | |
1187 | ios->cred = oi->i_cred; | |
1188 | ret = exofs_sbi_create(ios); | |
e6af00f1 | 1189 | if (ret) { |
06886a5a BH |
1190 | exofs_put_io_state(ios); |
1191 | return ERR_PTR(ret); | |
e6af00f1 BH |
1192 | } |
1193 | atomic_inc(&sbi->s_curr_pending); | |
1194 | ||
1195 | return inode; | |
1196 | } | |
ba9e5e98 BH |
1197 | |
1198 | /* | |
1199 | * struct to pass two arguments to update_inode's callback | |
1200 | */ | |
1201 | struct updatei_args { | |
1202 | struct exofs_sb_info *sbi; | |
1203 | struct exofs_fcb fcb; | |
1204 | }; | |
1205 | ||
1206 | /* | |
1207 | * Callback function from exofs_update_inode(). | |
1208 | */ | |
06886a5a | 1209 | static void updatei_done(struct exofs_io_state *ios, void *p) |
ba9e5e98 BH |
1210 | { |
1211 | struct updatei_args *args = p; | |
1212 | ||
06886a5a | 1213 | exofs_put_io_state(ios); |
ba9e5e98 BH |
1214 | |
1215 | atomic_dec(&args->sbi->s_curr_pending); | |
1216 | ||
1217 | kfree(args); | |
1218 | } | |
1219 | ||
1220 | /* | |
1221 | * Write the inode to the OSD. Just fill up the struct, and set the attribute | |
1222 | * synchronously or asynchronously depending on the do_sync flag. | |
1223 | */ | |
1224 | static int exofs_update_inode(struct inode *inode, int do_sync) | |
1225 | { | |
1226 | struct exofs_i_info *oi = exofs_i(inode); | |
1227 | struct super_block *sb = inode->i_sb; | |
1228 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
06886a5a | 1229 | struct exofs_io_state *ios; |
ba9e5e98 BH |
1230 | struct osd_attr attr; |
1231 | struct exofs_fcb *fcb; | |
1232 | struct updatei_args *args; | |
1233 | int ret; | |
1234 | ||
1235 | args = kzalloc(sizeof(*args), GFP_KERNEL); | |
34ce4e7c | 1236 | if (!args) { |
571f7f46 | 1237 | EXOFS_DBGMSG("Failed kzalloc of args\n"); |
ba9e5e98 | 1238 | return -ENOMEM; |
34ce4e7c | 1239 | } |
ba9e5e98 BH |
1240 | |
1241 | fcb = &args->fcb; | |
1242 | ||
1243 | fcb->i_mode = cpu_to_le16(inode->i_mode); | |
1244 | fcb->i_uid = cpu_to_le32(inode->i_uid); | |
1245 | fcb->i_gid = cpu_to_le32(inode->i_gid); | |
1246 | fcb->i_links_count = cpu_to_le16(inode->i_nlink); | |
1247 | fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); | |
1248 | fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec); | |
1249 | fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); | |
1250 | oi->i_commit_size = i_size_read(inode); | |
1251 | fcb->i_size = cpu_to_le64(oi->i_commit_size); | |
1252 | fcb->i_generation = cpu_to_le32(inode->i_generation); | |
1253 | ||
1254 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1255 | if (old_valid_dev(inode->i_rdev)) { | |
1256 | fcb->i_data[0] = | |
1257 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
1258 | fcb->i_data[1] = 0; | |
1259 | } else { | |
1260 | fcb->i_data[0] = 0; | |
1261 | fcb->i_data[1] = | |
1262 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
1263 | fcb->i_data[2] = 0; | |
1264 | } | |
1265 | } else | |
1266 | memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data)); | |
1267 | ||
45d3abcb | 1268 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
1269 | if (unlikely(ret)) { |
1270 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); | |
ba9e5e98 BH |
1271 | goto free_args; |
1272 | } | |
1273 | ||
ba9e5e98 BH |
1274 | attr = g_attr_inode_data; |
1275 | attr.val_ptr = fcb; | |
06886a5a BH |
1276 | ios->out_attr_len = 1; |
1277 | ios->out_attr = &attr; | |
ba9e5e98 | 1278 | |
fe2fd9ed | 1279 | wait_obj_created(oi); |
ba9e5e98 | 1280 | |
06886a5a | 1281 | if (!do_sync) { |
ba9e5e98 | 1282 | args->sbi = sbi; |
06886a5a BH |
1283 | ios->done = updatei_done; |
1284 | ios->private = args; | |
1285 | } | |
ba9e5e98 | 1286 | |
06886a5a BH |
1287 | ret = exofs_oi_write(oi, ios); |
1288 | if (!do_sync && !ret) { | |
ba9e5e98 BH |
1289 | atomic_inc(&sbi->s_curr_pending); |
1290 | goto out; /* deallocation in updatei_done */ | |
1291 | } | |
1292 | ||
06886a5a | 1293 | exofs_put_io_state(ios); |
ba9e5e98 BH |
1294 | free_args: |
1295 | kfree(args); | |
1296 | out: | |
34ce4e7c BH |
1297 | EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n", |
1298 | inode->i_ino, do_sync, ret); | |
ba9e5e98 BH |
1299 | return ret; |
1300 | } | |
1301 | ||
a9185b41 | 1302 | int exofs_write_inode(struct inode *inode, struct writeback_control *wbc) |
ba9e5e98 | 1303 | { |
97178b7b NP |
1304 | /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */ |
1305 | return exofs_update_inode(inode, 1); | |
ba9e5e98 BH |
1306 | } |
1307 | ||
1308 | /* | |
1309 | * Callback function from exofs_delete_inode() - don't have much cleaning up to | |
1310 | * do. | |
1311 | */ | |
06886a5a | 1312 | static void delete_done(struct exofs_io_state *ios, void *p) |
ba9e5e98 | 1313 | { |
06886a5a BH |
1314 | struct exofs_sb_info *sbi = p; |
1315 | ||
1316 | exofs_put_io_state(ios); | |
1317 | ||
ba9e5e98 BH |
1318 | atomic_dec(&sbi->s_curr_pending); |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * Called when the refcount of an inode reaches zero. We remove the object | |
1323 | * from the OSD here. We make sure the object was created before we try and | |
1324 | * delete it. | |
1325 | */ | |
4ec70c9b | 1326 | void exofs_evict_inode(struct inode *inode) |
ba9e5e98 BH |
1327 | { |
1328 | struct exofs_i_info *oi = exofs_i(inode); | |
1329 | struct super_block *sb = inode->i_sb; | |
1330 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
06886a5a | 1331 | struct exofs_io_state *ios; |
ba9e5e98 BH |
1332 | int ret; |
1333 | ||
1334 | truncate_inode_pages(&inode->i_data, 0); | |
1335 | ||
2f246fd0 | 1336 | /* TODO: should do better here */ |
4ec70c9b | 1337 | if (inode->i_nlink || is_bad_inode(inode)) |
ba9e5e98 BH |
1338 | goto no_delete; |
1339 | ||
ba9e5e98 | 1340 | inode->i_size = 0; |
4ec70c9b | 1341 | end_writeback(inode); |
ba9e5e98 | 1342 | |
fe2fd9ed BH |
1343 | /* if we are deleting an obj that hasn't been created yet, wait. |
1344 | * This also makes sure that create_done cannot be called with an | |
1345 | * already evicted inode. | |
1346 | */ | |
1347 | wait_obj_created(oi); | |
1348 | /* ignore the error, attempt a remove anyway */ | |
2f246fd0 BH |
1349 | |
1350 | /* Now Remove the OSD objects */ | |
1351 | ret = exofs_get_io_state(&sbi->layout, &ios); | |
1352 | if (unlikely(ret)) { | |
1353 | EXOFS_ERR("%s: exofs_get_io_state failed\n", __func__); | |
1354 | return; | |
ba9e5e98 BH |
1355 | } |
1356 | ||
06886a5a BH |
1357 | ios->obj.id = exofs_oi_objno(oi); |
1358 | ios->done = delete_done; | |
1359 | ios->private = sbi; | |
1360 | ios->cred = oi->i_cred; | |
1361 | ret = exofs_sbi_remove(ios); | |
ba9e5e98 | 1362 | if (ret) { |
06886a5a BH |
1363 | EXOFS_ERR("%s: exofs_sbi_remove failed\n", __func__); |
1364 | exofs_put_io_state(ios); | |
ba9e5e98 BH |
1365 | return; |
1366 | } | |
1367 | atomic_inc(&sbi->s_curr_pending); | |
1368 | ||
1369 | return; | |
1370 | ||
1371 | no_delete: | |
4ec70c9b | 1372 | end_writeback(inode); |
ba9e5e98 | 1373 | } |