Commit | Line | Data |
---|---|---|
e8062719 BH |
1 | /* |
2 | * Copyright (C) 2005, 2006 | |
27d2e149 | 3 | * Avishay Traeger (avishay@gmail.com) |
e8062719 BH |
4 | * Copyright (C) 2008, 2009 |
5 | * Boaz Harrosh <bharrosh@panasas.com> | |
6 | * | |
7 | * Copyrights for code taken from ext2: | |
8 | * Copyright (C) 1992, 1993, 1994, 1995 | |
9 | * Remy Card (card@masi.ibp.fr) | |
10 | * Laboratoire MASI - Institut Blaise Pascal | |
11 | * Universite Pierre et Marie Curie (Paris VI) | |
12 | * from | |
13 | * linux/fs/minix/inode.c | |
14 | * Copyright (C) 1991, 1992 Linus Torvalds | |
15 | * | |
16 | * This file is part of exofs. | |
17 | * | |
18 | * exofs is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation. Since it is based on ext2, and the only | |
21 | * valid version of GPL for the Linux kernel is version 2, the only valid | |
22 | * version of GPL for exofs is version 2. | |
23 | * | |
24 | * exofs is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with exofs; if not, write to the Free Software | |
31 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
32 | */ | |
33 | ||
5a0e3ad6 | 34 | #include <linux/slab.h> |
e8062719 BH |
35 | |
36 | #include "exofs.h" | |
37 | ||
fe33cc1e BH |
38 | #define EXOFS_DBGMSG2(M...) do {} while (0) |
39 | ||
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 | */ | |
7aebf410 | 188 | static int __readpages_done(struct page_collect *pcol) |
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); | |
7aebf410 | 224 | if (!pcol->read_4_write) |
beaec07b | 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 | ||
7aebf410 | 239 | __readpages_done(pcol); |
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 | ||
7aebf410 | 260 | static int read_exec(struct page_collect *pcol) |
beaec07b BH |
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 | ||
86093aaf BH |
270 | ios->pages = pcol->pages; |
271 | ios->nr_pages = pcol->nr_pages; | |
06886a5a BH |
272 | ios->length = pcol->length; |
273 | ios->offset = pcol->pg_first << PAGE_CACHE_SHIFT; | |
beaec07b | 274 | |
7aebf410 | 275 | if (pcol->read_4_write) { |
06886a5a | 276 | exofs_oi_read(oi, pcol->ios); |
7aebf410 | 277 | return __readpages_done(pcol); |
beaec07b BH |
278 | } |
279 | ||
280 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); | |
281 | if (!pcol_copy) { | |
282 | ret = -ENOMEM; | |
283 | goto err; | |
284 | } | |
285 | ||
286 | *pcol_copy = *pcol; | |
06886a5a BH |
287 | ios->done = readpages_done; |
288 | ios->private = pcol_copy; | |
289 | ret = exofs_oi_read(oi, ios); | |
beaec07b BH |
290 | if (unlikely(ret)) |
291 | goto err; | |
292 | ||
293 | atomic_inc(&pcol->sbi->s_curr_pending); | |
294 | ||
34ce4e7c | 295 | EXOFS_DBGMSG2("read_exec obj=0x%llx start=0x%llx length=0x%lx\n", |
06886a5a | 296 | ios->obj.id, _LLU(ios->offset), pcol->length); |
beaec07b BH |
297 | |
298 | /* pages ownership was passed to pcol_copy */ | |
299 | _pcol_reset(pcol); | |
300 | return 0; | |
301 | ||
302 | err: | |
7aebf410 | 303 | if (!pcol->read_4_write) |
beaec07b | 304 | _unlock_pcol_pages(pcol, ret, READ); |
06886a5a BH |
305 | |
306 | pcol_free(pcol); | |
b76a3f93 | 307 | |
beaec07b | 308 | kfree(pcol_copy); |
beaec07b BH |
309 | return ret; |
310 | } | |
311 | ||
312 | /* readpage_strip is called either directly from readpage() or by the VFS from | |
313 | * within read_cache_pages(), to add one more page to be read. It will try to | |
314 | * collect as many contiguous pages as posible. If a discontinuity is | |
315 | * encountered, or it runs out of resources, it will submit the previous segment | |
316 | * and will start a new collection. Eventually caller must submit the last | |
317 | * segment if present. | |
318 | */ | |
319 | static int readpage_strip(void *data, struct page *page) | |
320 | { | |
321 | struct page_collect *pcol = data; | |
322 | struct inode *inode = pcol->inode; | |
323 | struct exofs_i_info *oi = exofs_i(inode); | |
324 | loff_t i_size = i_size_read(inode); | |
325 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
326 | size_t len; | |
327 | int ret; | |
328 | ||
329 | /* FIXME: Just for debugging, will be removed */ | |
330 | if (PageUptodate(page)) | |
331 | EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino, | |
332 | page->index); | |
333 | ||
334 | if (page->index < end_index) | |
335 | len = PAGE_CACHE_SIZE; | |
336 | else if (page->index == end_index) | |
337 | len = i_size & ~PAGE_CACHE_MASK; | |
338 | else | |
339 | len = 0; | |
340 | ||
341 | if (!len || !obj_created(oi)) { | |
342 | /* this will be out of bounds, or doesn't exist yet. | |
343 | * Current page is cleared and the request is split | |
344 | */ | |
345 | clear_highpage(page); | |
346 | ||
347 | SetPageUptodate(page); | |
348 | if (PageError(page)) | |
349 | ClearPageError(page); | |
350 | ||
f17b1f9f BH |
351 | if (!pcol->read_4_write) |
352 | unlock_page(page); | |
a8f1418f BH |
353 | EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx " |
354 | "read_4_write=%d index=0x%lx end_index=0x%lx " | |
355 | "splitting\n", inode->i_ino, len, | |
356 | pcol->read_4_write, page->index, end_index); | |
beaec07b | 357 | |
7aebf410 | 358 | return read_exec(pcol); |
beaec07b BH |
359 | } |
360 | ||
361 | try_again: | |
362 | ||
363 | if (unlikely(pcol->pg_first == -1)) { | |
364 | pcol->pg_first = page->index; | |
365 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
366 | page->index)) { | |
367 | /* Discontinuity detected, split the request */ | |
7aebf410 | 368 | ret = read_exec(pcol); |
beaec07b BH |
369 | if (unlikely(ret)) |
370 | goto fail; | |
371 | goto try_again; | |
372 | } | |
373 | ||
86093aaf | 374 | if (!pcol->pages) { |
beaec07b BH |
375 | ret = pcol_try_alloc(pcol); |
376 | if (unlikely(ret)) | |
377 | goto fail; | |
378 | } | |
379 | ||
380 | if (len != PAGE_CACHE_SIZE) | |
381 | zero_user(page, len, PAGE_CACHE_SIZE - len); | |
382 | ||
fe33cc1e | 383 | EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
384 | inode->i_ino, page->index, len); |
385 | ||
386 | ret = pcol_add_page(pcol, page, len); | |
387 | if (ret) { | |
fe33cc1e | 388 | EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p " |
beaec07b BH |
389 | "this_len=0x%zx nr_pages=%u length=0x%lx\n", |
390 | page, len, pcol->nr_pages, pcol->length); | |
391 | ||
392 | /* split the request, and start again with current page */ | |
7aebf410 | 393 | ret = read_exec(pcol); |
beaec07b BH |
394 | if (unlikely(ret)) |
395 | goto fail; | |
396 | ||
397 | goto try_again; | |
398 | } | |
399 | ||
400 | return 0; | |
401 | ||
402 | fail: | |
403 | /* SetPageError(page); ??? */ | |
404 | unlock_page(page); | |
405 | return ret; | |
406 | } | |
407 | ||
408 | static int exofs_readpages(struct file *file, struct address_space *mapping, | |
409 | struct list_head *pages, unsigned nr_pages) | |
410 | { | |
411 | struct page_collect pcol; | |
412 | int ret; | |
413 | ||
414 | _pcol_init(&pcol, nr_pages, mapping->host); | |
415 | ||
416 | ret = read_cache_pages(mapping, pages, readpage_strip, &pcol); | |
417 | if (ret) { | |
418 | EXOFS_ERR("read_cache_pages => %d\n", ret); | |
419 | return ret; | |
420 | } | |
421 | ||
7aebf410 | 422 | return read_exec(&pcol); |
beaec07b BH |
423 | } |
424 | ||
7aebf410 | 425 | static int _readpage(struct page *page, bool read_4_write) |
beaec07b BH |
426 | { |
427 | struct page_collect pcol; | |
428 | int ret; | |
429 | ||
430 | _pcol_init(&pcol, 1, page->mapping->host); | |
431 | ||
7aebf410 | 432 | pcol.read_4_write = read_4_write; |
beaec07b BH |
433 | ret = readpage_strip(&pcol, page); |
434 | if (ret) { | |
435 | EXOFS_ERR("_readpage => %d\n", ret); | |
436 | return ret; | |
437 | } | |
438 | ||
7aebf410 | 439 | return read_exec(&pcol); |
beaec07b BH |
440 | } |
441 | ||
442 | /* | |
443 | * We don't need the file | |
444 | */ | |
445 | static int exofs_readpage(struct file *file, struct page *page) | |
446 | { | |
447 | return _readpage(page, false); | |
448 | } | |
449 | ||
06886a5a BH |
450 | /* Callback for osd_write. All writes are asynchronous */ |
451 | static void writepages_done(struct exofs_io_state *ios, void *p) | |
beaec07b BH |
452 | { |
453 | struct page_collect *pcol = p; | |
beaec07b BH |
454 | int i; |
455 | u64 resid; | |
456 | u64 good_bytes; | |
457 | u64 length = 0; | |
06886a5a | 458 | int ret = exofs_check_io(ios, &resid); |
beaec07b | 459 | |
beaec07b BH |
460 | atomic_dec(&pcol->sbi->s_curr_pending); |
461 | ||
462 | if (likely(!ret)) | |
463 | good_bytes = pcol->length; | |
beaec07b BH |
464 | else |
465 | good_bytes = pcol->length - resid; | |
466 | ||
34ce4e7c | 467 | EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx" |
beaec07b BH |
468 | " length=0x%lx nr_pages=%u\n", |
469 | pcol->inode->i_ino, _LLU(good_bytes), pcol->length, | |
470 | pcol->nr_pages); | |
471 | ||
86093aaf BH |
472 | for (i = 0; i < pcol->nr_pages; i++) { |
473 | struct page *page = pcol->pages[i]; | |
beaec07b BH |
474 | struct inode *inode = page->mapping->host; |
475 | int page_stat; | |
476 | ||
477 | if (inode != pcol->inode) | |
478 | continue; /* osd might add more pages to a bio */ | |
479 | ||
480 | if (likely(length < good_bytes)) | |
481 | page_stat = 0; | |
482 | else | |
483 | page_stat = ret; | |
484 | ||
485 | update_write_page(page, page_stat); | |
486 | unlock_page(page); | |
fe33cc1e | 487 | EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n", |
beaec07b BH |
488 | inode->i_ino, page->index, page_stat); |
489 | ||
86093aaf | 490 | length += PAGE_SIZE; |
beaec07b BH |
491 | } |
492 | ||
493 | pcol_free(pcol); | |
494 | kfree(pcol); | |
34ce4e7c | 495 | EXOFS_DBGMSG2("writepages_done END\n"); |
beaec07b BH |
496 | } |
497 | ||
498 | static int write_exec(struct page_collect *pcol) | |
499 | { | |
500 | struct exofs_i_info *oi = exofs_i(pcol->inode); | |
06886a5a | 501 | struct exofs_io_state *ios = pcol->ios; |
beaec07b | 502 | struct page_collect *pcol_copy = NULL; |
beaec07b BH |
503 | int ret; |
504 | ||
86093aaf | 505 | if (!pcol->pages) |
beaec07b BH |
506 | return 0; |
507 | ||
beaec07b BH |
508 | pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL); |
509 | if (!pcol_copy) { | |
571f7f46 | 510 | EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n"); |
beaec07b BH |
511 | ret = -ENOMEM; |
512 | goto err; | |
513 | } | |
514 | ||
515 | *pcol_copy = *pcol; | |
516 | ||
86093aaf BH |
517 | ios->pages = pcol_copy->pages; |
518 | ios->nr_pages = pcol_copy->nr_pages; | |
06886a5a BH |
519 | ios->offset = pcol_copy->pg_first << PAGE_CACHE_SHIFT; |
520 | ios->length = pcol_copy->length; | |
521 | ios->done = writepages_done; | |
522 | ios->private = pcol_copy; | |
523 | ||
524 | ret = exofs_oi_write(oi, ios); | |
beaec07b | 525 | if (unlikely(ret)) { |
571f7f46 | 526 | EXOFS_ERR("write_exec: exofs_oi_write() Failed\n"); |
beaec07b BH |
527 | goto err; |
528 | } | |
529 | ||
530 | atomic_inc(&pcol->sbi->s_curr_pending); | |
34ce4e7c | 531 | EXOFS_DBGMSG2("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n", |
06886a5a | 532 | pcol->inode->i_ino, pcol->pg_first, _LLU(ios->offset), |
beaec07b BH |
533 | pcol->length); |
534 | /* pages ownership was passed to pcol_copy */ | |
535 | _pcol_reset(pcol); | |
536 | return 0; | |
537 | ||
538 | err: | |
539 | _unlock_pcol_pages(pcol, ret, WRITE); | |
06886a5a | 540 | pcol_free(pcol); |
beaec07b | 541 | kfree(pcol_copy); |
06886a5a | 542 | |
beaec07b BH |
543 | return ret; |
544 | } | |
545 | ||
546 | /* writepage_strip is called either directly from writepage() or by the VFS from | |
547 | * within write_cache_pages(), to add one more page to be written to storage. | |
548 | * It will try to collect as many contiguous pages as possible. If a | |
549 | * discontinuity is encountered or it runs out of resources it will submit the | |
550 | * previous segment and will start a new collection. | |
551 | * Eventually caller must submit the last segment if present. | |
552 | */ | |
553 | static int writepage_strip(struct page *page, | |
554 | struct writeback_control *wbc_unused, void *data) | |
555 | { | |
556 | struct page_collect *pcol = data; | |
557 | struct inode *inode = pcol->inode; | |
558 | struct exofs_i_info *oi = exofs_i(inode); | |
559 | loff_t i_size = i_size_read(inode); | |
560 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
561 | size_t len; | |
562 | int ret; | |
563 | ||
564 | BUG_ON(!PageLocked(page)); | |
565 | ||
566 | ret = wait_obj_created(oi); | |
567 | if (unlikely(ret)) | |
568 | goto fail; | |
569 | ||
570 | if (page->index < end_index) | |
571 | /* in this case, the page is within the limits of the file */ | |
572 | len = PAGE_CACHE_SIZE; | |
573 | else { | |
574 | len = i_size & ~PAGE_CACHE_MASK; | |
575 | ||
576 | if (page->index > end_index || !len) { | |
577 | /* in this case, the page is outside the limits | |
578 | * (truncate in progress) | |
579 | */ | |
580 | ret = write_exec(pcol); | |
581 | if (unlikely(ret)) | |
582 | goto fail; | |
583 | if (PageError(page)) | |
584 | ClearPageError(page); | |
585 | unlock_page(page); | |
06886a5a BH |
586 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) " |
587 | "outside the limits\n", | |
588 | inode->i_ino, page->index); | |
beaec07b BH |
589 | return 0; |
590 | } | |
591 | } | |
592 | ||
593 | try_again: | |
594 | ||
595 | if (unlikely(pcol->pg_first == -1)) { | |
596 | pcol->pg_first = page->index; | |
597 | } else if (unlikely((pcol->pg_first + pcol->nr_pages) != | |
598 | page->index)) { | |
599 | /* Discontinuity detected, split the request */ | |
600 | ret = write_exec(pcol); | |
601 | if (unlikely(ret)) | |
602 | goto fail; | |
06886a5a BH |
603 | |
604 | EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n", | |
605 | inode->i_ino, page->index); | |
beaec07b BH |
606 | goto try_again; |
607 | } | |
608 | ||
86093aaf | 609 | if (!pcol->pages) { |
beaec07b BH |
610 | ret = pcol_try_alloc(pcol); |
611 | if (unlikely(ret)) | |
612 | goto fail; | |
613 | } | |
614 | ||
fe33cc1e | 615 | EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n", |
beaec07b BH |
616 | inode->i_ino, page->index, len); |
617 | ||
618 | ret = pcol_add_page(pcol, page, len); | |
619 | if (unlikely(ret)) { | |
34ce4e7c | 620 | EXOFS_DBGMSG2("Failed pcol_add_page " |
beaec07b BH |
621 | "nr_pages=%u total_length=0x%lx\n", |
622 | pcol->nr_pages, pcol->length); | |
623 | ||
624 | /* split the request, next loop will start again */ | |
625 | ret = write_exec(pcol); | |
626 | if (unlikely(ret)) { | |
571f7f46 | 627 | EXOFS_DBGMSG("write_exec failed => %d", ret); |
beaec07b BH |
628 | goto fail; |
629 | } | |
630 | ||
631 | goto try_again; | |
632 | } | |
633 | ||
634 | BUG_ON(PageWriteback(page)); | |
635 | set_page_writeback(page); | |
636 | ||
637 | return 0; | |
638 | ||
639 | fail: | |
06886a5a BH |
640 | EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n", |
641 | inode->i_ino, page->index, ret); | |
beaec07b BH |
642 | set_bit(AS_EIO, &page->mapping->flags); |
643 | unlock_page(page); | |
644 | return ret; | |
645 | } | |
646 | ||
647 | static int exofs_writepages(struct address_space *mapping, | |
648 | struct writeback_control *wbc) | |
649 | { | |
650 | struct page_collect pcol; | |
651 | long start, end, expected_pages; | |
652 | int ret; | |
653 | ||
654 | start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
655 | end = (wbc->range_end == LLONG_MAX) ? | |
656 | start + mapping->nrpages : | |
657 | wbc->range_end >> PAGE_CACHE_SHIFT; | |
658 | ||
659 | if (start || end) | |
06886a5a | 660 | expected_pages = end - start + 1; |
beaec07b BH |
661 | else |
662 | expected_pages = mapping->nrpages; | |
663 | ||
06886a5a BH |
664 | if (expected_pages < 32L) |
665 | expected_pages = 32L; | |
666 | ||
34ce4e7c | 667 | EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx " |
06886a5a | 668 | "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n", |
beaec07b | 669 | mapping->host->i_ino, wbc->range_start, wbc->range_end, |
06886a5a | 670 | mapping->nrpages, start, end, expected_pages); |
beaec07b BH |
671 | |
672 | _pcol_init(&pcol, expected_pages, mapping->host); | |
673 | ||
674 | ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol); | |
675 | if (ret) { | |
676 | EXOFS_ERR("write_cache_pages => %d\n", ret); | |
677 | return ret; | |
678 | } | |
679 | ||
680 | return write_exec(&pcol); | |
681 | } | |
682 | ||
683 | static int exofs_writepage(struct page *page, struct writeback_control *wbc) | |
684 | { | |
685 | struct page_collect pcol; | |
686 | int ret; | |
687 | ||
688 | _pcol_init(&pcol, 1, page->mapping->host); | |
689 | ||
690 | ret = writepage_strip(page, NULL, &pcol); | |
691 | if (ret) { | |
692 | EXOFS_ERR("exofs_writepage => %d\n", ret); | |
693 | return ret; | |
694 | } | |
695 | ||
696 | return write_exec(&pcol); | |
697 | } | |
698 | ||
2f246fd0 BH |
699 | /* i_mutex held using inode->i_size directly */ |
700 | static void _write_failed(struct inode *inode, loff_t to) | |
701 | { | |
702 | if (to > inode->i_size) | |
703 | truncate_pagecache(inode, to, inode->i_size); | |
704 | } | |
705 | ||
beaec07b BH |
706 | int exofs_write_begin(struct file *file, struct address_space *mapping, |
707 | loff_t pos, unsigned len, unsigned flags, | |
708 | struct page **pagep, void **fsdata) | |
709 | { | |
710 | int ret = 0; | |
711 | struct page *page; | |
712 | ||
713 | page = *pagep; | |
714 | if (page == NULL) { | |
715 | ret = simple_write_begin(file, mapping, pos, len, flags, pagep, | |
716 | fsdata); | |
717 | if (ret) { | |
571f7f46 | 718 | EXOFS_DBGMSG("simple_write_begin failed\n"); |
2f246fd0 | 719 | goto out; |
beaec07b BH |
720 | } |
721 | ||
722 | page = *pagep; | |
723 | } | |
724 | ||
725 | /* read modify write */ | |
726 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { | |
a8f1418f BH |
727 | loff_t i_size = i_size_read(mapping->host); |
728 | pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
729 | size_t rlen; | |
730 | ||
731 | if (page->index < end_index) | |
732 | rlen = PAGE_CACHE_SIZE; | |
733 | else if (page->index == end_index) | |
734 | rlen = i_size & ~PAGE_CACHE_MASK; | |
735 | else | |
736 | rlen = 0; | |
737 | ||
738 | if (!rlen) { | |
739 | clear_highpage(page); | |
740 | SetPageUptodate(page); | |
741 | goto out; | |
742 | } | |
743 | ||
beaec07b BH |
744 | ret = _readpage(page, true); |
745 | if (ret) { | |
746 | /*SetPageError was done by _readpage. Is it ok?*/ | |
747 | unlock_page(page); | |
a8f1418f | 748 | EXOFS_DBGMSG("__readpage failed\n"); |
beaec07b BH |
749 | } |
750 | } | |
2f246fd0 BH |
751 | out: |
752 | if (unlikely(ret)) | |
753 | _write_failed(mapping->host, pos + len); | |
beaec07b BH |
754 | |
755 | return ret; | |
756 | } | |
757 | ||
758 | static int exofs_write_begin_export(struct file *file, | |
759 | struct address_space *mapping, | |
760 | loff_t pos, unsigned len, unsigned flags, | |
761 | struct page **pagep, void **fsdata) | |
762 | { | |
763 | *pagep = NULL; | |
764 | ||
765 | return exofs_write_begin(file, mapping, pos, len, flags, pagep, | |
766 | fsdata); | |
767 | } | |
768 | ||
efd124b9 BH |
769 | static int exofs_write_end(struct file *file, struct address_space *mapping, |
770 | loff_t pos, unsigned len, unsigned copied, | |
771 | struct page *page, void *fsdata) | |
772 | { | |
773 | struct inode *inode = mapping->host; | |
774 | /* According to comment in simple_write_end i_mutex is held */ | |
775 | loff_t i_size = inode->i_size; | |
776 | int ret; | |
777 | ||
778 | ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata); | |
2f246fd0 BH |
779 | if (unlikely(ret)) |
780 | _write_failed(inode, pos + len); | |
781 | ||
782 | /* TODO: once simple_write_end marks inode dirty remove */ | |
efd124b9 BH |
783 | if (i_size != inode->i_size) |
784 | mark_inode_dirty(inode); | |
785 | return ret; | |
786 | } | |
787 | ||
200b0700 BH |
788 | static int exofs_releasepage(struct page *page, gfp_t gfp) |
789 | { | |
790 | EXOFS_DBGMSG("page 0x%lx\n", page->index); | |
791 | WARN_ON(1); | |
85dc7878 | 792 | return 0; |
200b0700 BH |
793 | } |
794 | ||
795 | static void exofs_invalidatepage(struct page *page, unsigned long offset) | |
796 | { | |
85dc7878 | 797 | EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset); |
200b0700 | 798 | WARN_ON(1); |
200b0700 BH |
799 | } |
800 | ||
beaec07b BH |
801 | const struct address_space_operations exofs_aops = { |
802 | .readpage = exofs_readpage, | |
803 | .readpages = exofs_readpages, | |
804 | .writepage = exofs_writepage, | |
805 | .writepages = exofs_writepages, | |
806 | .write_begin = exofs_write_begin_export, | |
efd124b9 | 807 | .write_end = exofs_write_end, |
200b0700 BH |
808 | .releasepage = exofs_releasepage, |
809 | .set_page_dirty = __set_page_dirty_nobuffers, | |
810 | .invalidatepage = exofs_invalidatepage, | |
811 | ||
812 | /* Not implemented Yet */ | |
813 | .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */ | |
814 | .direct_IO = NULL, /* TODO: Should be trivial to do */ | |
815 | ||
816 | /* With these NULL has special meaning or default is not exported */ | |
817 | .sync_page = NULL, | |
818 | .get_xip_mem = NULL, | |
819 | .migratepage = NULL, | |
820 | .launder_page = NULL, | |
821 | .is_partially_uptodate = NULL, | |
822 | .error_remove_page = NULL, | |
beaec07b BH |
823 | }; |
824 | ||
e8062719 BH |
825 | /****************************************************************************** |
826 | * INODE OPERATIONS | |
827 | *****************************************************************************/ | |
828 | ||
829 | /* | |
830 | * Test whether an inode is a fast symlink. | |
831 | */ | |
832 | static inline int exofs_inode_is_fast_symlink(struct inode *inode) | |
833 | { | |
834 | struct exofs_i_info *oi = exofs_i(inode); | |
835 | ||
836 | return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); | |
837 | } | |
838 | ||
e8062719 BH |
839 | const struct osd_attr g_attr_logical_length = ATTR_DEF( |
840 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); | |
841 | ||
2f246fd0 | 842 | static int _do_truncate(struct inode *inode, loff_t newsize) |
06886a5a BH |
843 | { |
844 | struct exofs_i_info *oi = exofs_i(inode); | |
06886a5a BH |
845 | int ret; |
846 | ||
847 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
848 | ||
2f246fd0 BH |
849 | ret = exofs_oi_truncate(oi, (u64)newsize); |
850 | if (likely(!ret)) | |
851 | truncate_setsize(inode, newsize); | |
06886a5a | 852 | |
2f246fd0 BH |
853 | EXOFS_DBGMSG("(0x%lx) size=0x%llx ret=>%d\n", |
854 | inode->i_ino, newsize, ret); | |
06886a5a BH |
855 | return ret; |
856 | } | |
857 | ||
e8062719 | 858 | /* |
2f246fd0 BH |
859 | * Set inode attributes - update size attribute on OSD if needed, |
860 | * otherwise just call generic functions. | |
e8062719 BH |
861 | */ |
862 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) | |
863 | { | |
864 | struct inode *inode = dentry->d_inode; | |
865 | int error; | |
866 | ||
2f246fd0 BH |
867 | /* if we are about to modify an object, and it hasn't been |
868 | * created yet, wait | |
869 | */ | |
870 | error = wait_obj_created(exofs_i(inode)); | |
871 | if (unlikely(error)) | |
872 | return error; | |
873 | ||
e8062719 | 874 | error = inode_change_ok(inode, iattr); |
2f246fd0 | 875 | if (unlikely(error)) |
e8062719 BH |
876 | return error; |
877 | ||
1025774c CH |
878 | if ((iattr->ia_valid & ATTR_SIZE) && |
879 | iattr->ia_size != i_size_read(inode)) { | |
2f246fd0 BH |
880 | error = _do_truncate(inode, iattr->ia_size); |
881 | if (unlikely(error)) | |
1025774c CH |
882 | return error; |
883 | } | |
884 | ||
885 | setattr_copy(inode, iattr); | |
886 | mark_inode_dirty(inode); | |
887 | return 0; | |
e8062719 | 888 | } |
e6af00f1 | 889 | |
d9c740d2 BH |
890 | static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF( |
891 | EXOFS_APAGE_FS_DATA, | |
892 | EXOFS_ATTR_INODE_FILE_LAYOUT, | |
893 | 0); | |
894 | static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF( | |
895 | EXOFS_APAGE_FS_DATA, | |
896 | EXOFS_ATTR_INODE_DIR_LAYOUT, | |
897 | 0); | |
898 | ||
e6af00f1 | 899 | /* |
5d952b83 BH |
900 | * Read the Linux inode info from the OSD, and return it as is. In exofs the |
901 | * inode info is in an application specific page/attribute of the osd-object. | |
e6af00f1 BH |
902 | */ |
903 | static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi, | |
5d952b83 | 904 | struct exofs_fcb *inode) |
e6af00f1 BH |
905 | { |
906 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
d9c740d2 BH |
907 | struct osd_attr attrs[] = { |
908 | [0] = g_attr_inode_data, | |
909 | [1] = g_attr_inode_file_layout, | |
910 | [2] = g_attr_inode_dir_layout, | |
d9c740d2 | 911 | }; |
06886a5a | 912 | struct exofs_io_state *ios; |
d9c740d2 | 913 | struct exofs_on_disk_inode_layout *layout; |
e6af00f1 BH |
914 | int ret; |
915 | ||
45d3abcb | 916 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
917 | if (unlikely(ret)) { |
918 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); | |
919 | return ret; | |
e6af00f1 | 920 | } |
e6af00f1 | 921 | |
06886a5a BH |
922 | ios->obj.id = exofs_oi_objno(oi); |
923 | exofs_make_credential(oi->i_cred, &ios->obj); | |
924 | ios->cred = oi->i_cred; | |
e6af00f1 | 925 | |
d9c740d2 BH |
926 | attrs[1].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs); |
927 | attrs[2].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs); | |
928 | ||
06886a5a BH |
929 | ios->in_attr = attrs; |
930 | ios->in_attr_len = ARRAY_SIZE(attrs); | |
e6af00f1 | 931 | |
06886a5a | 932 | ret = exofs_sbi_read(ios); |
96391e2b BH |
933 | if (unlikely(ret)) { |
934 | EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n", | |
935 | _LLU(ios->obj.id), ret); | |
936 | memset(inode, 0, sizeof(*inode)); | |
937 | inode->i_mode = 0040000 | (0777 & ~022); | |
938 | /* If object is lost on target we might as well enable it's | |
939 | * delete. | |
940 | */ | |
941 | if ((ret == -ENOENT) || (ret == -EINVAL)) | |
942 | ret = 0; | |
e6af00f1 | 943 | goto out; |
96391e2b | 944 | } |
e6af00f1 | 945 | |
06886a5a | 946 | ret = extract_attr_from_ios(ios, &attrs[0]); |
e6af00f1 | 947 | if (ret) { |
06886a5a | 948 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); |
e6af00f1 BH |
949 | goto out; |
950 | } | |
06886a5a BH |
951 | WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE); |
952 | memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE); | |
e6af00f1 | 953 | |
06886a5a | 954 | ret = extract_attr_from_ios(ios, &attrs[1]); |
d9c740d2 BH |
955 | if (ret) { |
956 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
957 | goto out; | |
958 | } | |
959 | if (attrs[1].len) { | |
960 | layout = attrs[1].val_ptr; | |
961 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
962 | EXOFS_ERR("%s: unsupported files layout %d\n", | |
963 | __func__, layout->gen_func); | |
964 | ret = -ENOTSUPP; | |
965 | goto out; | |
966 | } | |
967 | } | |
968 | ||
969 | ret = extract_attr_from_ios(ios, &attrs[2]); | |
970 | if (ret) { | |
971 | EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__); | |
972 | goto out; | |
973 | } | |
974 | if (attrs[2].len) { | |
975 | layout = attrs[2].val_ptr; | |
976 | if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) { | |
977 | EXOFS_ERR("%s: unsupported meta-data layout %d\n", | |
978 | __func__, layout->gen_func); | |
979 | ret = -ENOTSUPP; | |
980 | goto out; | |
981 | } | |
982 | } | |
983 | ||
e6af00f1 | 984 | out: |
06886a5a | 985 | exofs_put_io_state(ios); |
e6af00f1 BH |
986 | return ret; |
987 | } | |
988 | ||
9cfdc7aa BH |
989 | static void __oi_init(struct exofs_i_info *oi) |
990 | { | |
991 | init_waitqueue_head(&oi->i_wq); | |
992 | oi->i_flags = 0; | |
993 | } | |
e6af00f1 BH |
994 | /* |
995 | * Fill in an inode read from the OSD and set it up for use | |
996 | */ | |
997 | struct inode *exofs_iget(struct super_block *sb, unsigned long ino) | |
998 | { | |
999 | struct exofs_i_info *oi; | |
1000 | struct exofs_fcb fcb; | |
1001 | struct inode *inode; | |
e6af00f1 BH |
1002 | int ret; |
1003 | ||
1004 | inode = iget_locked(sb, ino); | |
1005 | if (!inode) | |
1006 | return ERR_PTR(-ENOMEM); | |
1007 | if (!(inode->i_state & I_NEW)) | |
1008 | return inode; | |
1009 | oi = exofs_i(inode); | |
9cfdc7aa | 1010 | __oi_init(oi); |
e6af00f1 BH |
1011 | |
1012 | /* read the inode from the osd */ | |
5d952b83 | 1013 | ret = exofs_get_inode(sb, oi, &fcb); |
e6af00f1 BH |
1014 | if (ret) |
1015 | goto bad_inode; | |
1016 | ||
e6af00f1 BH |
1017 | set_obj_created(oi); |
1018 | ||
1019 | /* copy stuff from on-disk struct to in-memory struct */ | |
1020 | inode->i_mode = le16_to_cpu(fcb.i_mode); | |
1021 | inode->i_uid = le32_to_cpu(fcb.i_uid); | |
1022 | inode->i_gid = le32_to_cpu(fcb.i_gid); | |
1023 | inode->i_nlink = le16_to_cpu(fcb.i_links_count); | |
1024 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime); | |
1025 | inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime); | |
1026 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime); | |
1027 | inode->i_ctime.tv_nsec = | |
1028 | inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0; | |
1029 | oi->i_commit_size = le64_to_cpu(fcb.i_size); | |
1030 | i_size_write(inode, oi->i_commit_size); | |
1031 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1032 | inode->i_generation = le32_to_cpu(fcb.i_generation); | |
1033 | ||
e6af00f1 BH |
1034 | oi->i_dir_start_lookup = 0; |
1035 | ||
1036 | if ((inode->i_nlink == 0) && (inode->i_mode == 0)) { | |
1037 | ret = -ESTALE; | |
1038 | goto bad_inode; | |
1039 | } | |
1040 | ||
1041 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1042 | if (fcb.i_data[0]) | |
1043 | inode->i_rdev = | |
1044 | old_decode_dev(le32_to_cpu(fcb.i_data[0])); | |
1045 | else | |
1046 | inode->i_rdev = | |
1047 | new_decode_dev(le32_to_cpu(fcb.i_data[1])); | |
1048 | } else { | |
1049 | memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); | |
1050 | } | |
1051 | ||
1052 | if (S_ISREG(inode->i_mode)) { | |
1053 | inode->i_op = &exofs_file_inode_operations; | |
1054 | inode->i_fop = &exofs_file_operations; | |
1055 | inode->i_mapping->a_ops = &exofs_aops; | |
1056 | } else if (S_ISDIR(inode->i_mode)) { | |
1057 | inode->i_op = &exofs_dir_inode_operations; | |
1058 | inode->i_fop = &exofs_dir_operations; | |
1059 | inode->i_mapping->a_ops = &exofs_aops; | |
1060 | } else if (S_ISLNK(inode->i_mode)) { | |
1061 | if (exofs_inode_is_fast_symlink(inode)) | |
1062 | inode->i_op = &exofs_fast_symlink_inode_operations; | |
1063 | else { | |
1064 | inode->i_op = &exofs_symlink_inode_operations; | |
1065 | inode->i_mapping->a_ops = &exofs_aops; | |
1066 | } | |
1067 | } else { | |
1068 | inode->i_op = &exofs_special_inode_operations; | |
1069 | if (fcb.i_data[0]) | |
1070 | init_special_inode(inode, inode->i_mode, | |
1071 | old_decode_dev(le32_to_cpu(fcb.i_data[0]))); | |
1072 | else | |
1073 | init_special_inode(inode, inode->i_mode, | |
1074 | new_decode_dev(le32_to_cpu(fcb.i_data[1]))); | |
1075 | } | |
1076 | ||
1077 | unlock_new_inode(inode); | |
1078 | return inode; | |
1079 | ||
1080 | bad_inode: | |
1081 | iget_failed(inode); | |
1082 | return ERR_PTR(ret); | |
1083 | } | |
1084 | ||
1085 | int __exofs_wait_obj_created(struct exofs_i_info *oi) | |
1086 | { | |
1087 | if (!obj_created(oi)) { | |
fe2fd9ed | 1088 | EXOFS_DBGMSG("!obj_created\n"); |
e6af00f1 BH |
1089 | BUG_ON(!obj_2bcreated(oi)); |
1090 | wait_event(oi->i_wq, obj_created(oi)); | |
fe2fd9ed | 1091 | EXOFS_DBGMSG("wait_event done\n"); |
e6af00f1 BH |
1092 | } |
1093 | return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0; | |
1094 | } | |
1095 | /* | |
1096 | * Callback function from exofs_new_inode(). The important thing is that we | |
1097 | * set the obj_created flag so that other methods know that the object exists on | |
1098 | * the OSD. | |
1099 | */ | |
06886a5a | 1100 | static void create_done(struct exofs_io_state *ios, void *p) |
e6af00f1 BH |
1101 | { |
1102 | struct inode *inode = p; | |
1103 | struct exofs_i_info *oi = exofs_i(inode); | |
1104 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
1105 | int ret; | |
1106 | ||
06886a5a BH |
1107 | ret = exofs_check_io(ios, NULL); |
1108 | exofs_put_io_state(ios); | |
1109 | ||
e6af00f1 BH |
1110 | atomic_dec(&sbi->s_curr_pending); |
1111 | ||
1112 | if (unlikely(ret)) { | |
571f7f46 | 1113 | EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx", |
45d3abcb | 1114 | _LLU(exofs_oi_objno(oi)), _LLU(sbi->layout.s_pid)); |
06886a5a BH |
1115 | /*TODO: When FS is corrupted creation can fail, object already |
1116 | * exist. Get rid of this asynchronous creation, if exist | |
1117 | * increment the obj counter and try the next object. Until we | |
1118 | * succeed. All these dangling objects will be made into lost | |
1119 | * files by chkfs.exofs | |
1120 | */ | |
1121 | } | |
1122 | ||
1123 | set_obj_created(oi); | |
e6af00f1 | 1124 | |
e6af00f1 BH |
1125 | wake_up(&oi->i_wq); |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Set up a new inode and create an object for it on the OSD | |
1130 | */ | |
1131 | struct inode *exofs_new_inode(struct inode *dir, int mode) | |
1132 | { | |
1133 | struct super_block *sb; | |
1134 | struct inode *inode; | |
1135 | struct exofs_i_info *oi; | |
1136 | struct exofs_sb_info *sbi; | |
06886a5a | 1137 | struct exofs_io_state *ios; |
e6af00f1 BH |
1138 | int ret; |
1139 | ||
1140 | sb = dir->i_sb; | |
1141 | inode = new_inode(sb); | |
1142 | if (!inode) | |
1143 | return ERR_PTR(-ENOMEM); | |
1144 | ||
1145 | oi = exofs_i(inode); | |
9cfdc7aa | 1146 | __oi_init(oi); |
e6af00f1 | 1147 | |
e6af00f1 BH |
1148 | set_obj_2bcreated(oi); |
1149 | ||
1150 | sbi = sb->s_fs_info; | |
1151 | ||
1152 | sb->s_dirt = 1; | |
e00117f1 | 1153 | inode_init_owner(inode, dir, mode); |
e6af00f1 BH |
1154 | inode->i_ino = sbi->s_nextid++; |
1155 | inode->i_blkbits = EXOFS_BLKSHIFT; | |
1156 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1157 | oi->i_commit_size = inode->i_size = 0; | |
1158 | spin_lock(&sbi->s_next_gen_lock); | |
1159 | inode->i_generation = sbi->s_next_generation++; | |
1160 | spin_unlock(&sbi->s_next_gen_lock); | |
1161 | insert_inode_hash(inode); | |
1162 | ||
1163 | mark_inode_dirty(inode); | |
1164 | ||
45d3abcb | 1165 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
1166 | if (unlikely(ret)) { |
1167 | EXOFS_ERR("exofs_new_inode: exofs_get_io_state failed\n"); | |
1168 | return ERR_PTR(ret); | |
e6af00f1 BH |
1169 | } |
1170 | ||
06886a5a BH |
1171 | ios->obj.id = exofs_oi_objno(oi); |
1172 | exofs_make_credential(oi->i_cred, &ios->obj); | |
e6af00f1 | 1173 | |
06886a5a BH |
1174 | ios->done = create_done; |
1175 | ios->private = inode; | |
1176 | ios->cred = oi->i_cred; | |
1177 | ret = exofs_sbi_create(ios); | |
e6af00f1 | 1178 | if (ret) { |
06886a5a BH |
1179 | exofs_put_io_state(ios); |
1180 | return ERR_PTR(ret); | |
e6af00f1 BH |
1181 | } |
1182 | atomic_inc(&sbi->s_curr_pending); | |
1183 | ||
1184 | return inode; | |
1185 | } | |
ba9e5e98 BH |
1186 | |
1187 | /* | |
1188 | * struct to pass two arguments to update_inode's callback | |
1189 | */ | |
1190 | struct updatei_args { | |
1191 | struct exofs_sb_info *sbi; | |
1192 | struct exofs_fcb fcb; | |
1193 | }; | |
1194 | ||
1195 | /* | |
1196 | * Callback function from exofs_update_inode(). | |
1197 | */ | |
06886a5a | 1198 | static void updatei_done(struct exofs_io_state *ios, void *p) |
ba9e5e98 BH |
1199 | { |
1200 | struct updatei_args *args = p; | |
1201 | ||
06886a5a | 1202 | exofs_put_io_state(ios); |
ba9e5e98 BH |
1203 | |
1204 | atomic_dec(&args->sbi->s_curr_pending); | |
1205 | ||
1206 | kfree(args); | |
1207 | } | |
1208 | ||
1209 | /* | |
1210 | * Write the inode to the OSD. Just fill up the struct, and set the attribute | |
1211 | * synchronously or asynchronously depending on the do_sync flag. | |
1212 | */ | |
1213 | static int exofs_update_inode(struct inode *inode, int do_sync) | |
1214 | { | |
1215 | struct exofs_i_info *oi = exofs_i(inode); | |
1216 | struct super_block *sb = inode->i_sb; | |
1217 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
06886a5a | 1218 | struct exofs_io_state *ios; |
ba9e5e98 BH |
1219 | struct osd_attr attr; |
1220 | struct exofs_fcb *fcb; | |
1221 | struct updatei_args *args; | |
1222 | int ret; | |
1223 | ||
1224 | args = kzalloc(sizeof(*args), GFP_KERNEL); | |
34ce4e7c | 1225 | if (!args) { |
571f7f46 | 1226 | EXOFS_DBGMSG("Failed kzalloc of args\n"); |
ba9e5e98 | 1227 | return -ENOMEM; |
34ce4e7c | 1228 | } |
ba9e5e98 BH |
1229 | |
1230 | fcb = &args->fcb; | |
1231 | ||
1232 | fcb->i_mode = cpu_to_le16(inode->i_mode); | |
1233 | fcb->i_uid = cpu_to_le32(inode->i_uid); | |
1234 | fcb->i_gid = cpu_to_le32(inode->i_gid); | |
1235 | fcb->i_links_count = cpu_to_le16(inode->i_nlink); | |
1236 | fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); | |
1237 | fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec); | |
1238 | fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); | |
1239 | oi->i_commit_size = i_size_read(inode); | |
1240 | fcb->i_size = cpu_to_le64(oi->i_commit_size); | |
1241 | fcb->i_generation = cpu_to_le32(inode->i_generation); | |
1242 | ||
1243 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { | |
1244 | if (old_valid_dev(inode->i_rdev)) { | |
1245 | fcb->i_data[0] = | |
1246 | cpu_to_le32(old_encode_dev(inode->i_rdev)); | |
1247 | fcb->i_data[1] = 0; | |
1248 | } else { | |
1249 | fcb->i_data[0] = 0; | |
1250 | fcb->i_data[1] = | |
1251 | cpu_to_le32(new_encode_dev(inode->i_rdev)); | |
1252 | fcb->i_data[2] = 0; | |
1253 | } | |
1254 | } else | |
1255 | memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data)); | |
1256 | ||
45d3abcb | 1257 | ret = exofs_get_io_state(&sbi->layout, &ios); |
06886a5a BH |
1258 | if (unlikely(ret)) { |
1259 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); | |
ba9e5e98 BH |
1260 | goto free_args; |
1261 | } | |
1262 | ||
ba9e5e98 BH |
1263 | attr = g_attr_inode_data; |
1264 | attr.val_ptr = fcb; | |
06886a5a BH |
1265 | ios->out_attr_len = 1; |
1266 | ios->out_attr = &attr; | |
ba9e5e98 | 1267 | |
fe2fd9ed | 1268 | wait_obj_created(oi); |
ba9e5e98 | 1269 | |
06886a5a | 1270 | if (!do_sync) { |
ba9e5e98 | 1271 | args->sbi = sbi; |
06886a5a BH |
1272 | ios->done = updatei_done; |
1273 | ios->private = args; | |
1274 | } | |
ba9e5e98 | 1275 | |
06886a5a BH |
1276 | ret = exofs_oi_write(oi, ios); |
1277 | if (!do_sync && !ret) { | |
ba9e5e98 BH |
1278 | atomic_inc(&sbi->s_curr_pending); |
1279 | goto out; /* deallocation in updatei_done */ | |
1280 | } | |
1281 | ||
06886a5a | 1282 | exofs_put_io_state(ios); |
ba9e5e98 BH |
1283 | free_args: |
1284 | kfree(args); | |
1285 | out: | |
34ce4e7c BH |
1286 | EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n", |
1287 | inode->i_ino, do_sync, ret); | |
ba9e5e98 BH |
1288 | return ret; |
1289 | } | |
1290 | ||
a9185b41 | 1291 | int exofs_write_inode(struct inode *inode, struct writeback_control *wbc) |
ba9e5e98 | 1292 | { |
a9185b41 | 1293 | return exofs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
ba9e5e98 BH |
1294 | } |
1295 | ||
1296 | /* | |
1297 | * Callback function from exofs_delete_inode() - don't have much cleaning up to | |
1298 | * do. | |
1299 | */ | |
06886a5a | 1300 | static void delete_done(struct exofs_io_state *ios, void *p) |
ba9e5e98 | 1301 | { |
06886a5a BH |
1302 | struct exofs_sb_info *sbi = p; |
1303 | ||
1304 | exofs_put_io_state(ios); | |
1305 | ||
ba9e5e98 BH |
1306 | atomic_dec(&sbi->s_curr_pending); |
1307 | } | |
1308 | ||
1309 | /* | |
1310 | * Called when the refcount of an inode reaches zero. We remove the object | |
1311 | * from the OSD here. We make sure the object was created before we try and | |
1312 | * delete it. | |
1313 | */ | |
4ec70c9b | 1314 | void exofs_evict_inode(struct inode *inode) |
ba9e5e98 BH |
1315 | { |
1316 | struct exofs_i_info *oi = exofs_i(inode); | |
1317 | struct super_block *sb = inode->i_sb; | |
1318 | struct exofs_sb_info *sbi = sb->s_fs_info; | |
06886a5a | 1319 | struct exofs_io_state *ios; |
ba9e5e98 BH |
1320 | int ret; |
1321 | ||
1322 | truncate_inode_pages(&inode->i_data, 0); | |
1323 | ||
2f246fd0 | 1324 | /* TODO: should do better here */ |
4ec70c9b | 1325 | if (inode->i_nlink || is_bad_inode(inode)) |
ba9e5e98 BH |
1326 | goto no_delete; |
1327 | ||
ba9e5e98 | 1328 | inode->i_size = 0; |
4ec70c9b | 1329 | end_writeback(inode); |
ba9e5e98 | 1330 | |
fe2fd9ed BH |
1331 | /* if we are deleting an obj that hasn't been created yet, wait. |
1332 | * This also makes sure that create_done cannot be called with an | |
1333 | * already evicted inode. | |
1334 | */ | |
1335 | wait_obj_created(oi); | |
1336 | /* ignore the error, attempt a remove anyway */ | |
2f246fd0 BH |
1337 | |
1338 | /* Now Remove the OSD objects */ | |
1339 | ret = exofs_get_io_state(&sbi->layout, &ios); | |
1340 | if (unlikely(ret)) { | |
1341 | EXOFS_ERR("%s: exofs_get_io_state failed\n", __func__); | |
1342 | return; | |
ba9e5e98 BH |
1343 | } |
1344 | ||
06886a5a BH |
1345 | ios->obj.id = exofs_oi_objno(oi); |
1346 | ios->done = delete_done; | |
1347 | ios->private = sbi; | |
1348 | ios->cred = oi->i_cred; | |
1349 | ret = exofs_sbi_remove(ios); | |
ba9e5e98 | 1350 | if (ret) { |
06886a5a BH |
1351 | EXOFS_ERR("%s: exofs_sbi_remove failed\n", __func__); |
1352 | exofs_put_io_state(ios); | |
ba9e5e98 BH |
1353 | return; |
1354 | } | |
1355 | atomic_inc(&sbi->s_curr_pending); | |
1356 | ||
1357 | return; | |
1358 | ||
1359 | no_delete: | |
4ec70c9b | 1360 | end_writeback(inode); |
ba9e5e98 | 1361 | } |