Commit | Line | Data |
---|---|---|
b3f08cad EP |
1 | /* |
2 | * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> | |
3 | * All rights reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/backing-dev.h> | |
18 | #include <linux/crypto.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/jhash.h> | |
21 | #include <linux/hash.h> | |
22 | #include <linux/ktime.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/mount.h> | |
25 | #include <linux/pagemap.h> | |
26 | #include <linux/pagevec.h> | |
27 | #include <linux/parser.h> | |
28 | #include <linux/swap.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/statfs.h> | |
31 | #include <linux/writeback.h> | |
32 | #include <linux/quotaops.h> | |
33 | ||
34 | #include "netfs.h" | |
35 | ||
36 | #define POHMELFS_MAGIC_NUM 0x504f482e | |
37 | ||
38 | static struct kmem_cache *pohmelfs_inode_cache; | |
39 | ||
40 | /* | |
41 | * Removes inode from all trees, drops local name cache and removes all queued | |
42 | * requests for object removal. | |
43 | */ | |
44 | void pohmelfs_inode_del_inode(struct pohmelfs_sb *psb, struct pohmelfs_inode *pi) | |
45 | { | |
46 | mutex_lock(&pi->offset_lock); | |
47 | pohmelfs_free_names(pi); | |
48 | mutex_unlock(&pi->offset_lock); | |
49 | ||
50 | dprintk("%s: deleted stuff in ino: %llu.\n", __func__, pi->ino); | |
51 | } | |
52 | ||
53 | /* | |
54 | * Sync inode to server. | |
55 | * Returns zero in success and negative error value otherwise. | |
56 | * It will gather path to root directory into structures containing | |
57 | * creation mode, permissions and names, so that the whole path | |
58 | * to given inode could be created using only single network command. | |
59 | */ | |
60 | int pohmelfs_write_inode_create(struct inode *inode, struct netfs_trans *trans) | |
61 | { | |
62 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
63 | int err = -ENOMEM, size; | |
64 | struct netfs_cmd *cmd; | |
65 | void *data; | |
66 | int cur_len = netfs_trans_cur_len(trans); | |
67 | ||
68 | if (unlikely(cur_len < 0)) | |
69 | return -ETOOSMALL; | |
70 | ||
71 | cmd = netfs_trans_current(trans); | |
72 | cur_len -= sizeof(struct netfs_cmd); | |
73 | ||
74 | data = (void *)(cmd + 1); | |
75 | ||
76 | err = pohmelfs_construct_path_string(pi, data, cur_len); | |
77 | if (err < 0) | |
78 | goto err_out_exit; | |
79 | ||
80 | size = err; | |
81 | ||
82 | cmd->start = i_size_read(inode); | |
83 | cmd->cmd = NETFS_CREATE; | |
84 | cmd->size = size; | |
85 | cmd->id = pi->ino; | |
86 | cmd->ext = inode->i_mode; | |
87 | ||
88 | netfs_convert_cmd(cmd); | |
89 | ||
90 | netfs_trans_update(cmd, trans, size); | |
91 | ||
92 | return 0; | |
93 | ||
94 | err_out_exit: | |
95 | printk("%s: completed ino: %llu, err: %d.\n", __func__, pi->ino, err); | |
96 | return err; | |
97 | } | |
98 | ||
99 | static int pohmelfs_write_trans_complete(struct page **pages, unsigned int page_num, | |
100 | void *private, int err) | |
101 | { | |
102 | unsigned i; | |
103 | ||
104 | dprintk("%s: pages: %lu-%lu, page_num: %u, err: %d.\n", | |
105 | __func__, pages[0]->index, pages[page_num-1]->index, | |
106 | page_num, err); | |
107 | ||
108 | for (i = 0; i < page_num; i++) { | |
109 | struct page *page = pages[i]; | |
110 | ||
111 | if (!page) | |
112 | continue; | |
113 | ||
114 | end_page_writeback(page); | |
115 | ||
116 | if (err < 0) { | |
117 | SetPageError(page); | |
118 | set_page_dirty(page); | |
119 | } | |
120 | ||
121 | unlock_page(page); | |
122 | page_cache_release(page); | |
123 | ||
124 | /* dprintk("%s: %3u/%u: page: %p.\n", __func__, i, page_num, page); */ | |
125 | } | |
126 | return err; | |
127 | } | |
128 | ||
129 | static int pohmelfs_inode_has_dirty_pages(struct address_space *mapping, pgoff_t index) | |
130 | { | |
131 | int ret; | |
132 | struct page *page; | |
133 | ||
134 | rcu_read_lock(); | |
135 | ret = radix_tree_gang_lookup_tag(&mapping->page_tree, | |
136 | (void **)&page, index, 1, PAGECACHE_TAG_DIRTY); | |
137 | rcu_read_unlock(); | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static int pohmelfs_writepages(struct address_space *mapping, struct writeback_control *wbc) | |
142 | { | |
143 | struct inode *inode = mapping->host; | |
144 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
145 | struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); | |
146 | struct backing_dev_info *bdi = mapping->backing_dev_info; | |
147 | int err = 0; | |
148 | int done = 0; | |
149 | int nr_pages; | |
150 | pgoff_t index; | |
151 | pgoff_t end; /* Inclusive */ | |
152 | int scanned = 0; | |
153 | int range_whole = 0; | |
154 | ||
155 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
156 | wbc->encountered_congestion = 1; | |
157 | return 0; | |
158 | } | |
159 | ||
160 | if (wbc->range_cyclic) { | |
161 | index = mapping->writeback_index; /* Start from prev offset */ | |
162 | end = -1; | |
163 | } else { | |
164 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
165 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
166 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
167 | range_whole = 1; | |
168 | scanned = 1; | |
169 | } | |
170 | retry: | |
171 | while (!done && (index <= end)) { | |
172 | unsigned int i = min(end - index, (pgoff_t)psb->trans_max_pages); | |
173 | int path_len; | |
174 | struct netfs_trans *trans; | |
175 | ||
176 | err = pohmelfs_inode_has_dirty_pages(mapping, index); | |
177 | if (!err) | |
178 | break; | |
179 | ||
180 | err = pohmelfs_path_length(pi); | |
181 | if (err < 0) | |
182 | break; | |
183 | ||
184 | path_len = err; | |
185 | ||
186 | if (path_len <= 2) { | |
187 | err = -ENOENT; | |
188 | break; | |
189 | } | |
190 | ||
191 | trans = netfs_trans_alloc(psb, path_len, 0, i); | |
192 | if (!trans) { | |
193 | err = -ENOMEM; | |
194 | break; | |
195 | } | |
196 | trans->complete = &pohmelfs_write_trans_complete; | |
197 | ||
198 | trans->page_num = nr_pages = find_get_pages_tag(mapping, &index, | |
199 | PAGECACHE_TAG_DIRTY, trans->page_num, | |
200 | trans->pages); | |
201 | ||
202 | dprintk("%s: t: %p, nr_pages: %u, end: %lu, index: %lu, max: %u.\n", | |
203 | __func__, trans, nr_pages, end, index, trans->page_num); | |
204 | ||
205 | if (!nr_pages) | |
206 | goto err_out_reset; | |
207 | ||
208 | err = pohmelfs_write_inode_create(inode, trans); | |
209 | if (err) | |
210 | goto err_out_reset; | |
211 | ||
212 | err = 0; | |
213 | scanned = 1; | |
214 | ||
215 | for (i = 0; i < trans->page_num; i++) { | |
216 | struct page *page = trans->pages[i]; | |
217 | ||
218 | lock_page(page); | |
219 | ||
220 | if (unlikely(page->mapping != mapping)) | |
221 | goto out_continue; | |
222 | ||
223 | if (!wbc->range_cyclic && page->index > end) { | |
224 | done = 1; | |
225 | goto out_continue; | |
226 | } | |
227 | ||
228 | if (wbc->sync_mode != WB_SYNC_NONE) | |
229 | wait_on_page_writeback(page); | |
230 | ||
231 | if (PageWriteback(page) || | |
232 | !clear_page_dirty_for_io(page)) { | |
233 | dprintk("%s: not clear for io page: %p, writeback: %d.\n", | |
234 | __func__, page, PageWriteback(page)); | |
235 | goto out_continue; | |
236 | } | |
237 | ||
238 | set_page_writeback(page); | |
239 | ||
240 | trans->attached_size += page_private(page); | |
241 | trans->attached_pages++; | |
242 | #if 0 | |
243 | dprintk("%s: %u/%u added trans: %p, gen: %u, page: %p, [High: %d], size: %lu, idx: %lu.\n", | |
244 | __func__, i, trans->page_num, trans, trans->gen, page, | |
245 | !!PageHighMem(page), page_private(page), page->index); | |
246 | #endif | |
247 | wbc->nr_to_write--; | |
248 | ||
249 | if (wbc->nr_to_write <= 0) | |
250 | done = 1; | |
251 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
252 | wbc->encountered_congestion = 1; | |
253 | done = 1; | |
254 | } | |
255 | ||
256 | continue; | |
257 | out_continue: | |
258 | unlock_page(page); | |
259 | trans->pages[i] = NULL; | |
260 | } | |
261 | ||
262 | err = netfs_trans_finish(trans, psb); | |
263 | if (err) | |
264 | break; | |
265 | ||
266 | continue; | |
267 | ||
268 | err_out_reset: | |
269 | trans->result = err; | |
270 | netfs_trans_reset(trans); | |
271 | netfs_trans_put(trans); | |
272 | break; | |
273 | } | |
274 | ||
275 | if (!scanned && !done) { | |
276 | /* | |
277 | * We hit the last page and there is more work to be done: wrap | |
278 | * back to the start of the file | |
279 | */ | |
280 | scanned = 1; | |
281 | index = 0; | |
282 | goto retry; | |
283 | } | |
284 | ||
285 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) | |
286 | mapping->writeback_index = index; | |
287 | ||
288 | return err; | |
289 | } | |
290 | ||
291 | /* | |
292 | * Inode writeback creation completion callback. | |
293 | * Only invoked for just created inodes, which do not have pages attached, | |
294 | * like dirs and empty files. | |
295 | */ | |
296 | static int pohmelfs_write_inode_complete(struct page **pages, unsigned int page_num, | |
297 | void *private, int err) | |
298 | { | |
299 | struct inode *inode = private; | |
300 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
301 | ||
302 | if (inode) { | |
303 | if (err) { | |
304 | mark_inode_dirty(inode); | |
305 | clear_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state); | |
306 | } else { | |
307 | set_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state); | |
308 | } | |
309 | ||
310 | pohmelfs_put_inode(pi); | |
311 | } | |
312 | ||
313 | return err; | |
314 | } | |
315 | ||
316 | int pohmelfs_write_create_inode(struct pohmelfs_inode *pi) | |
317 | { | |
318 | struct netfs_trans *t; | |
319 | struct inode *inode = &pi->vfs_inode; | |
320 | struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); | |
321 | int err; | |
322 | ||
323 | if (test_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state)) | |
324 | return 0; | |
325 | ||
326 | dprintk("%s: started ino: %llu.\n", __func__, pi->ino); | |
327 | ||
328 | err = pohmelfs_path_length(pi); | |
329 | if (err < 0) | |
330 | goto err_out_exit; | |
331 | ||
332 | t = netfs_trans_alloc(psb, err + 1, 0, 0); | |
333 | if (!t) { | |
334 | err = -ENOMEM; | |
335 | goto err_out_put; | |
336 | } | |
337 | t->complete = pohmelfs_write_inode_complete; | |
338 | t->private = igrab(inode); | |
339 | if (!t->private) { | |
340 | err = -ENOENT; | |
341 | goto err_out_put; | |
342 | } | |
343 | ||
344 | err = pohmelfs_write_inode_create(inode, t); | |
345 | if (err) | |
346 | goto err_out_put; | |
347 | ||
348 | netfs_trans_finish(t, POHMELFS_SB(inode->i_sb)); | |
349 | ||
350 | return 0; | |
351 | ||
352 | err_out_put: | |
353 | t->result = err; | |
354 | netfs_trans_put(t); | |
355 | err_out_exit: | |
356 | return err; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Sync all not-yet-created children in given directory to the server. | |
361 | */ | |
362 | static int pohmelfs_write_inode_create_children(struct inode *inode) | |
363 | { | |
364 | struct pohmelfs_inode *parent = POHMELFS_I(inode); | |
365 | struct super_block *sb = inode->i_sb; | |
366 | struct pohmelfs_name *n; | |
367 | ||
368 | while (!list_empty(&parent->sync_create_list)) { | |
369 | n = NULL; | |
370 | mutex_lock(&parent->offset_lock); | |
371 | if (!list_empty(&parent->sync_create_list)) { | |
372 | n = list_first_entry(&parent->sync_create_list, | |
373 | struct pohmelfs_name, sync_create_entry); | |
374 | list_del_init(&n->sync_create_entry); | |
375 | } | |
376 | mutex_unlock(&parent->offset_lock); | |
377 | ||
378 | if (!n) | |
379 | break; | |
380 | ||
381 | inode = ilookup(sb, n->ino); | |
382 | ||
383 | dprintk("%s: parent: %llu, ino: %llu, inode: %p.\n", | |
384 | __func__, parent->ino, n->ino, inode); | |
385 | ||
386 | if (inode && (inode->i_state & I_DIRTY)) { | |
387 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
388 | pohmelfs_write_create_inode(pi); | |
389 | //pohmelfs_meta_command(pi, NETFS_INODE_INFO, 0, NULL, NULL, 0); | |
390 | iput(inode); | |
391 | } | |
392 | } | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | /* | |
398 | * Removes given child from given inode on server. | |
399 | */ | |
400 | int pohmelfs_remove_child(struct pohmelfs_inode *pi, struct pohmelfs_name *n) | |
401 | { | |
402 | return pohmelfs_meta_command_data(pi, pi->ino, NETFS_REMOVE, NULL, 0, NULL, NULL, 0); | |
403 | } | |
404 | ||
405 | /* | |
406 | * Writeback for given inode. | |
407 | */ | |
408 | static int pohmelfs_write_inode(struct inode *inode, int sync) | |
409 | { | |
410 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
411 | ||
412 | pohmelfs_write_create_inode(pi); | |
413 | pohmelfs_write_inode_create_children(inode); | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | /* | |
419 | * It is not exported, sorry... | |
420 | */ | |
421 | static inline wait_queue_head_t *page_waitqueue(struct page *page) | |
422 | { | |
423 | const struct zone *zone = page_zone(page); | |
424 | ||
425 | return &zone->wait_table[hash_ptr(page, zone->wait_table_bits)]; | |
426 | } | |
427 | ||
428 | static int pohmelfs_wait_on_page_locked(struct page *page) | |
429 | { | |
430 | struct pohmelfs_sb *psb = POHMELFS_SB(page->mapping->host->i_sb); | |
431 | long ret = psb->wait_on_page_timeout; | |
432 | DEFINE_WAIT_BIT(wait, &page->flags, PG_locked); | |
433 | int err = 0; | |
434 | ||
435 | if (!PageLocked(page)) | |
436 | return 0; | |
437 | ||
438 | for (;;) { | |
439 | prepare_to_wait(page_waitqueue(page), | |
440 | &wait.wait, TASK_INTERRUPTIBLE); | |
441 | ||
442 | dprintk("%s: page: %p, locked: %d, uptodate: %d, error: %d, flags: %lx.\n", | |
443 | __func__, page, PageLocked(page), PageUptodate(page), | |
444 | PageError(page), page->flags); | |
445 | ||
446 | if (!PageLocked(page)) | |
447 | break; | |
448 | ||
449 | if (!signal_pending(current)) { | |
450 | ret = schedule_timeout(ret); | |
451 | if (!ret) | |
452 | break; | |
453 | continue; | |
454 | } | |
455 | ret = -ERESTARTSYS; | |
456 | break; | |
457 | } | |
458 | finish_wait(page_waitqueue(page), &wait.wait); | |
459 | ||
460 | if (!ret) | |
461 | err = -ETIMEDOUT; | |
462 | ||
463 | ||
464 | if (!err) | |
465 | SetPageUptodate(page); | |
466 | ||
467 | if (err) | |
468 | printk("%s: page: %p, uptodate: %d, locked: %d, err: %d.\n", | |
469 | __func__, page, PageUptodate(page), PageLocked(page), err); | |
470 | ||
471 | return err; | |
472 | } | |
473 | ||
474 | static int pohmelfs_read_page_complete(struct page **pages, unsigned int page_num, | |
475 | void *private, int err) | |
476 | { | |
477 | struct page *page = private; | |
478 | ||
479 | if (PageChecked(page)) | |
480 | return err; | |
481 | ||
482 | if (err < 0) { | |
483 | dprintk("%s: page: %p, err: %d.\n", __func__, page, err); | |
484 | SetPageError(page); | |
485 | } | |
486 | ||
487 | unlock_page(page); | |
488 | ||
489 | return err; | |
490 | } | |
491 | ||
492 | /* | |
493 | * Read a page from remote server. | |
494 | * Function will wait until page is unlocked. | |
495 | */ | |
496 | static int pohmelfs_readpage(struct file *file, struct page *page) | |
497 | { | |
498 | struct inode *inode = page->mapping->host; | |
499 | struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); | |
500 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
501 | struct netfs_trans *t; | |
502 | struct netfs_cmd *cmd; | |
503 | int err, path_len; | |
504 | void *data; | |
505 | u64 isize; | |
506 | ||
507 | err = pohmelfs_data_lock(pi, page->index << PAGE_CACHE_SHIFT, | |
508 | PAGE_SIZE, POHMELFS_READ_LOCK); | |
509 | if (err) | |
510 | goto err_out_exit; | |
511 | ||
512 | isize = i_size_read(inode); | |
513 | if (isize <= page->index << PAGE_CACHE_SHIFT) { | |
514 | SetPageUptodate(page); | |
515 | unlock_page(page); | |
516 | return 0; | |
517 | } | |
518 | ||
519 | path_len = pohmelfs_path_length(pi); | |
520 | if (path_len < 0) { | |
521 | err = path_len; | |
522 | goto err_out_exit; | |
523 | } | |
524 | ||
525 | t = netfs_trans_alloc(psb, path_len, NETFS_TRANS_SINGLE_DST, 0); | |
526 | if (!t) { | |
527 | err = -ENOMEM; | |
528 | goto err_out_exit; | |
529 | } | |
530 | ||
531 | t->complete = pohmelfs_read_page_complete; | |
532 | t->private = page; | |
533 | ||
534 | cmd = netfs_trans_current(t); | |
535 | data = (void *)(cmd + 1); | |
536 | ||
537 | err = pohmelfs_construct_path_string(pi, data, path_len); | |
538 | if (err < 0) | |
539 | goto err_out_free; | |
540 | ||
541 | path_len = err; | |
542 | ||
543 | cmd->id = pi->ino; | |
544 | cmd->start = page->index; | |
545 | cmd->start <<= PAGE_CACHE_SHIFT; | |
546 | cmd->size = PAGE_CACHE_SIZE + path_len; | |
547 | cmd->cmd = NETFS_READ_PAGE; | |
548 | cmd->ext = path_len; | |
549 | ||
550 | dprintk("%s: path: '%s', page: %p, ino: %llu, start: %llu, size: %lu.\n", | |
551 | __func__, (char *)data, page, pi->ino, cmd->start, PAGE_CACHE_SIZE); | |
552 | ||
553 | netfs_convert_cmd(cmd); | |
554 | netfs_trans_update(cmd, t, path_len); | |
555 | ||
556 | err = netfs_trans_finish(t, psb); | |
557 | if (err) | |
558 | goto err_out_return; | |
559 | ||
560 | return pohmelfs_wait_on_page_locked(page); | |
561 | ||
562 | err_out_free: | |
563 | t->result = err; | |
564 | netfs_trans_put(t); | |
565 | err_out_exit: | |
566 | SetPageError(page); | |
567 | if (PageLocked(page)) | |
568 | unlock_page(page); | |
569 | err_out_return: | |
570 | printk("%s: page: %p, start: %lu, size: %lu, err: %d.\n", | |
571 | __func__, page, page->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE, err); | |
572 | ||
573 | return err; | |
574 | } | |
575 | ||
576 | /* | |
577 | * Write begin/end magic. | |
578 | * Allocates a page and writes inode if it was not synced to server before. | |
579 | */ | |
580 | static int pohmelfs_write_begin(struct file *file, struct address_space *mapping, | |
581 | loff_t pos, unsigned len, unsigned flags, | |
582 | struct page **pagep, void **fsdata) | |
583 | { | |
584 | struct inode *inode = mapping->host; | |
585 | struct page *page; | |
586 | pgoff_t index; | |
587 | unsigned start, end; | |
588 | int err; | |
589 | ||
590 | *pagep = NULL; | |
591 | ||
592 | index = pos >> PAGE_CACHE_SHIFT; | |
593 | start = pos & (PAGE_CACHE_SIZE - 1); | |
594 | end = start + len; | |
595 | ||
596 | page = grab_cache_page(mapping, index); | |
597 | #if 0 | |
598 | dprintk("%s: page: %p pos: %llu, len: %u, index: %lu, start: %u, end: %u, uptodate: %d.\n", | |
599 | __func__, page, pos, len, index, start, end, PageUptodate(page)); | |
600 | #endif | |
601 | if (!page) { | |
602 | err = -ENOMEM; | |
603 | goto err_out_exit; | |
604 | } | |
605 | ||
606 | while (!PageUptodate(page)) { | |
607 | if (start && test_bit(NETFS_INODE_REMOTE_SYNCED, &POHMELFS_I(inode)->state)) { | |
608 | err = pohmelfs_readpage(file, page); | |
609 | if (err) | |
610 | goto err_out_exit; | |
611 | ||
612 | lock_page(page); | |
613 | continue; | |
614 | } | |
615 | ||
616 | if (len != PAGE_CACHE_SIZE) { | |
617 | void *kaddr = kmap_atomic(page, KM_USER0); | |
618 | ||
619 | memset(kaddr + start, 0, PAGE_CACHE_SIZE - start); | |
620 | flush_dcache_page(page); | |
621 | kunmap_atomic(kaddr, KM_USER0); | |
622 | } | |
623 | SetPageUptodate(page); | |
624 | } | |
625 | ||
626 | set_page_private(page, end); | |
627 | ||
628 | *pagep = page; | |
629 | ||
630 | return 0; | |
631 | ||
632 | err_out_exit: | |
633 | page_cache_release(page); | |
634 | *pagep = NULL; | |
635 | ||
636 | return err; | |
637 | } | |
638 | ||
639 | static int pohmelfs_write_end(struct file *file, struct address_space *mapping, | |
640 | loff_t pos, unsigned len, unsigned copied, | |
641 | struct page *page, void *fsdata) | |
642 | { | |
643 | struct inode *inode = mapping->host; | |
644 | ||
645 | if (copied != len) { | |
646 | unsigned from = pos & (PAGE_CACHE_SIZE - 1); | |
647 | void *kaddr = kmap_atomic(page, KM_USER0); | |
648 | ||
649 | memset(kaddr + from + copied, 0, len - copied); | |
650 | flush_dcache_page(page); | |
651 | kunmap_atomic(kaddr, KM_USER0); | |
652 | } | |
653 | ||
654 | SetPageUptodate(page); | |
655 | set_page_dirty(page); | |
656 | #if 0 | |
657 | dprintk("%s: page: %p [U: %d, D: %d, L: %d], pos: %llu, len: %u, copied: %u.\n", | |
658 | __func__, page, | |
659 | PageUptodate(page), PageDirty(page), PageLocked(page), | |
660 | pos, len, copied); | |
661 | #endif | |
662 | flush_dcache_page(page); | |
663 | ||
664 | unlock_page(page); | |
665 | page_cache_release(page); | |
666 | ||
667 | if (pos + copied > inode->i_size) { | |
668 | struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); | |
669 | ||
670 | psb->avail_size -= pos + copied - inode->i_size; | |
671 | ||
672 | i_size_write(inode, pos + copied); | |
673 | } | |
674 | ||
675 | return copied; | |
676 | } | |
677 | ||
678 | static int pohmelfs_readpages_trans_complete(struct page **__pages, unsigned int page_num, | |
679 | void *private, int err) | |
680 | { | |
681 | struct pohmelfs_inode *pi = private; | |
682 | unsigned int i, num; | |
683 | struct page **pages, *page = (struct page *)__pages; | |
684 | loff_t index = page->index; | |
685 | ||
686 | pages = kzalloc(sizeof(void *) * page_num, GFP_NOIO); | |
687 | if (!pages) | |
688 | return -ENOMEM; | |
689 | ||
690 | num = find_get_pages_contig(pi->vfs_inode.i_mapping, index, page_num, pages); | |
691 | if (num <= 0) { | |
692 | err = num; | |
693 | goto err_out_free; | |
694 | } | |
695 | ||
696 | for (i=0; i<num; ++i) { | |
697 | page = pages[i]; | |
698 | ||
699 | if (err) | |
700 | printk("%s: %u/%u: page: %p, index: %lu, uptodate: %d, locked: %d, err: %d.\n", | |
701 | __func__, i, num, page, page->index, | |
702 | PageUptodate(page), PageLocked(page), err); | |
703 | ||
704 | if (!PageChecked(page)) { | |
705 | if (err < 0) | |
706 | SetPageError(page); | |
707 | unlock_page(page); | |
708 | } | |
709 | page_cache_release(page); | |
710 | page_cache_release(page); | |
711 | } | |
712 | ||
713 | err_out_free: | |
714 | kfree(pages); | |
715 | return err; | |
716 | } | |
717 | ||
718 | static int pohmelfs_send_readpages(struct pohmelfs_inode *pi, struct page *first, unsigned int num) | |
719 | { | |
720 | struct netfs_trans *t; | |
721 | struct netfs_cmd *cmd; | |
722 | struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb); | |
723 | int err, path_len; | |
724 | void *data; | |
725 | ||
726 | err = pohmelfs_data_lock(pi, first->index << PAGE_CACHE_SHIFT, | |
727 | num * PAGE_SIZE, POHMELFS_READ_LOCK); | |
728 | if (err) | |
729 | goto err_out_exit; | |
730 | ||
731 | path_len = pohmelfs_path_length(pi); | |
732 | if (path_len < 0) { | |
733 | err = path_len; | |
734 | goto err_out_exit; | |
735 | } | |
736 | ||
737 | t = netfs_trans_alloc(psb, path_len, NETFS_TRANS_SINGLE_DST, 0); | |
738 | if (!t) { | |
739 | err = -ENOMEM; | |
740 | goto err_out_exit; | |
741 | } | |
742 | ||
743 | cmd = netfs_trans_current(t); | |
744 | data = (void *)(cmd + 1); | |
745 | ||
746 | t->complete = pohmelfs_readpages_trans_complete; | |
747 | t->private = pi; | |
748 | t->page_num = num; | |
749 | t->pages = (struct page **)first; | |
750 | ||
751 | err = pohmelfs_construct_path_string(pi, data, path_len); | |
752 | if (err < 0) | |
753 | goto err_out_put; | |
754 | ||
755 | path_len = err; | |
756 | ||
757 | cmd->cmd = NETFS_READ_PAGES; | |
758 | cmd->start = first->index; | |
759 | cmd->start <<= PAGE_CACHE_SHIFT; | |
760 | cmd->size = (num << 8 | PAGE_CACHE_SHIFT); | |
761 | cmd->id = pi->ino; | |
762 | cmd->ext = path_len; | |
763 | ||
764 | dprintk("%s: t: %p, gen: %u, path: '%s', path_len: %u, " | |
765 | "start: %lu, num: %u.\n", | |
766 | __func__, t, t->gen, (char *)data, path_len, | |
767 | first->index, num); | |
768 | ||
769 | netfs_convert_cmd(cmd); | |
770 | netfs_trans_update(cmd, t, path_len); | |
771 | ||
772 | return netfs_trans_finish(t, psb); | |
773 | ||
774 | err_out_put: | |
775 | netfs_trans_free(t); | |
776 | err_out_exit: | |
777 | pohmelfs_readpages_trans_complete((struct page **)first, num, pi, err); | |
778 | return err; | |
779 | } | |
780 | ||
781 | #define list_to_page(head) (list_entry((head)->prev, struct page, lru)) | |
782 | ||
783 | static int pohmelfs_readpages(struct file *file, struct address_space *mapping, | |
784 | struct list_head *pages, unsigned nr_pages) | |
785 | { | |
786 | unsigned int page_idx, num = 0; | |
787 | struct page *page = NULL, *first = NULL; | |
788 | ||
789 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { | |
790 | page = list_to_page(pages); | |
791 | ||
792 | prefetchw(&page->flags); | |
793 | list_del(&page->lru); | |
794 | ||
795 | if (!add_to_page_cache_lru(page, mapping, | |
796 | page->index, GFP_KERNEL)) { | |
797 | ||
798 | if (!num) { | |
799 | num = 1; | |
800 | first = page; | |
801 | continue; | |
802 | } | |
803 | ||
804 | dprintk("%s: added to lru page: %p, page_index: %lu, first_index: %lu.\n", | |
805 | __func__, page, page->index, first->index); | |
806 | ||
807 | if (unlikely(first->index + num != page->index) || (num > 500)) { | |
808 | pohmelfs_send_readpages(POHMELFS_I(mapping->host), | |
809 | first, num); | |
810 | first = page; | |
811 | num = 0; | |
812 | } | |
813 | ||
814 | num++; | |
815 | } | |
816 | } | |
817 | pohmelfs_send_readpages(POHMELFS_I(mapping->host), first, num); | |
818 | ||
819 | /* | |
820 | * This will be sync read, so when last page is processed, | |
821 | * all previous are alerady unlocked and ready to be used. | |
822 | */ | |
823 | return 0; | |
824 | } | |
825 | ||
826 | /* | |
827 | * Small addres space operations for POHMELFS. | |
828 | */ | |
829 | const struct address_space_operations pohmelfs_aops = { | |
830 | .readpage = pohmelfs_readpage, | |
831 | .readpages = pohmelfs_readpages, | |
832 | .writepages = pohmelfs_writepages, | |
833 | .write_begin = pohmelfs_write_begin, | |
834 | .write_end = pohmelfs_write_end, | |
835 | .set_page_dirty = __set_page_dirty_nobuffers, | |
836 | }; | |
837 | ||
838 | /* | |
839 | * ->detroy_inode() callback. Deletes inode from the caches | |
840 | * and frees private data. | |
841 | */ | |
842 | static void pohmelfs_destroy_inode(struct inode *inode) | |
843 | { | |
844 | struct super_block *sb = inode->i_sb; | |
845 | struct pohmelfs_sb *psb = POHMELFS_SB(sb); | |
846 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
847 | ||
848 | //pohmelfs_data_unlock(pi, 0, inode->i_size, POHMELFS_READ_LOCK); | |
849 | ||
850 | pohmelfs_inode_del_inode(psb, pi); | |
851 | ||
852 | dprintk("%s: pi: %p, inode: %p, ino: %llu.\n", | |
853 | __func__, pi, &pi->vfs_inode, pi->ino); | |
854 | kmem_cache_free(pohmelfs_inode_cache, pi); | |
855 | atomic_long_dec(&psb->total_inodes); | |
856 | } | |
857 | ||
858 | /* | |
859 | * ->alloc_inode() callback. Allocates inode and initilizes private data. | |
860 | */ | |
861 | static struct inode *pohmelfs_alloc_inode(struct super_block *sb) | |
862 | { | |
863 | struct pohmelfs_inode *pi; | |
864 | ||
865 | pi = kmem_cache_alloc(pohmelfs_inode_cache, GFP_NOIO); | |
866 | if (!pi) | |
867 | return NULL; | |
868 | ||
869 | pi->hash_root = RB_ROOT; | |
870 | mutex_init(&pi->offset_lock); | |
871 | ||
872 | INIT_LIST_HEAD(&pi->sync_create_list); | |
873 | ||
874 | INIT_LIST_HEAD(&pi->inode_entry); | |
875 | ||
876 | pi->lock_type = 0; | |
877 | pi->state = 0; | |
878 | pi->total_len = 0; | |
879 | pi->drop_count = 0; | |
880 | ||
881 | dprintk("%s: pi: %p, inode: %p.\n", __func__, pi, &pi->vfs_inode); | |
882 | ||
883 | atomic_long_inc(&POHMELFS_SB(sb)->total_inodes); | |
884 | ||
885 | return &pi->vfs_inode; | |
886 | } | |
887 | ||
888 | /* | |
889 | * We want fsync() to work on POHMELFS. | |
890 | */ | |
891 | static int pohmelfs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
892 | { | |
893 | struct inode *inode = file->f_mapping->host; | |
894 | struct writeback_control wbc = { | |
895 | .sync_mode = WB_SYNC_ALL, | |
896 | .nr_to_write = 0, /* sys_fsync did this */ | |
897 | }; | |
898 | ||
899 | return sync_inode(inode, &wbc); | |
900 | } | |
901 | ||
902 | ssize_t pohmelfs_write(struct file *file, const char __user *buf, | |
903 | size_t len, loff_t *ppos) | |
904 | { | |
905 | struct address_space *mapping = file->f_mapping; | |
906 | struct inode *inode = mapping->host; | |
907 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
908 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; | |
909 | struct kiocb kiocb; | |
910 | ssize_t ret; | |
911 | loff_t pos = *ppos; | |
912 | ||
913 | init_sync_kiocb(&kiocb, file); | |
914 | kiocb.ki_pos = pos; | |
915 | kiocb.ki_left = len; | |
916 | ||
02d84ca5 | 917 | dprintk("%s: len: %zu, pos: %llu.\n", __func__, len, pos); |
b3f08cad EP |
918 | |
919 | mutex_lock(&inode->i_mutex); | |
920 | ret = pohmelfs_data_lock(pi, pos, len, POHMELFS_WRITE_LOCK); | |
921 | if (ret) | |
922 | goto err_out_unlock; | |
923 | ||
924 | ret = generic_file_aio_write_nolock(&kiocb, &iov, 1, pos); | |
925 | *ppos = kiocb.ki_pos; | |
926 | ||
927 | mutex_unlock(&inode->i_mutex); | |
928 | WARN_ON(ret < 0); | |
929 | ||
930 | if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) { | |
931 | ssize_t err; | |
932 | ||
933 | err = sync_page_range(inode, mapping, pos, ret); | |
934 | if (err < 0) | |
935 | ret = err; | |
936 | WARN_ON(ret < 0); | |
937 | } | |
938 | ||
939 | return ret; | |
940 | ||
941 | err_out_unlock: | |
942 | mutex_unlock(&inode->i_mutex); | |
943 | return ret; | |
944 | } | |
945 | ||
946 | const static struct file_operations pohmelfs_file_ops = { | |
947 | .open = generic_file_open, | |
948 | .fsync = pohmelfs_fsync, | |
949 | ||
950 | .llseek = generic_file_llseek, | |
951 | ||
952 | .read = do_sync_read, | |
953 | .aio_read = generic_file_aio_read, | |
954 | ||
955 | .mmap = generic_file_mmap, | |
956 | ||
957 | .splice_read = generic_file_splice_read, | |
958 | .splice_write = generic_file_splice_write, | |
959 | ||
960 | .write = pohmelfs_write, | |
961 | .aio_write = generic_file_aio_write, | |
962 | }; | |
963 | ||
964 | const struct inode_operations pohmelfs_symlink_inode_operations = { | |
965 | .readlink = generic_readlink, | |
966 | .follow_link = page_follow_link_light, | |
967 | .put_link = page_put_link, | |
968 | }; | |
969 | ||
970 | int pohmelfs_setattr_raw(struct inode *inode, struct iattr *attr) | |
971 | { | |
972 | int err; | |
973 | ||
974 | err = inode_change_ok(inode, attr); | |
975 | if (err) { | |
976 | dprintk("%s: ino: %llu, inode changes are not allowed.\n", __func__, POHMELFS_I(inode)->ino); | |
977 | goto err_out_exit; | |
978 | } | |
979 | ||
980 | if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) || | |
981 | (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) { | |
de459f26 | 982 | err = vfs_dq_transfer(inode, attr) ? -EDQUOT : 0; |
b3f08cad EP |
983 | if (err) |
984 | goto err_out_exit; | |
985 | } | |
986 | ||
987 | err = inode_setattr(inode, attr); | |
988 | if (err) { | |
989 | dprintk("%s: ino: %llu, failed to set the attributes.\n", __func__, POHMELFS_I(inode)->ino); | |
990 | goto err_out_exit; | |
991 | } | |
992 | ||
993 | dprintk("%s: ino: %llu, mode: %o -> %o, uid: %u -> %u, gid: %u -> %u, size: %llu -> %llu.\n", | |
994 | __func__, POHMELFS_I(inode)->ino, inode->i_mode, attr->ia_mode, | |
995 | inode->i_uid, attr->ia_uid, inode->i_gid, attr->ia_gid, inode->i_size, attr->ia_size); | |
996 | ||
997 | return 0; | |
998 | ||
999 | err_out_exit: | |
1000 | return err; | |
1001 | } | |
1002 | ||
1003 | int pohmelfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1004 | { | |
1005 | struct inode *inode = dentry->d_inode; | |
1006 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
1007 | int err; | |
1008 | ||
1009 | err = pohmelfs_data_lock(pi, 0, ~0, POHMELFS_WRITE_LOCK); | |
1010 | if (err) | |
1011 | goto err_out_exit; | |
1012 | ||
1013 | err = security_inode_setattr(dentry, attr); | |
1014 | if (err) | |
1015 | goto err_out_exit; | |
1016 | ||
1017 | err = pohmelfs_setattr_raw(inode, attr); | |
1018 | if (err) | |
1019 | goto err_out_exit; | |
1020 | ||
1021 | return 0; | |
1022 | ||
1023 | err_out_exit: | |
1024 | return err; | |
1025 | } | |
1026 | ||
1027 | static int pohmelfs_send_xattr_req(struct pohmelfs_inode *pi, u64 id, u64 start, | |
1028 | const char *name, const void *value, size_t attrsize, int command) | |
1029 | { | |
1030 | struct pohmelfs_sb *psb = POHMELFS_SB(pi->vfs_inode.i_sb); | |
1031 | int err, path_len, namelen = strlen(name) + 1; /* 0-byte */ | |
1032 | struct netfs_trans *t; | |
1033 | struct netfs_cmd *cmd; | |
1034 | void *data; | |
1035 | ||
02d84ca5 | 1036 | dprintk("%s: id: %llu, start: %llu, name: '%s', attrsize: %zu, cmd: %d.\n", |
b3f08cad EP |
1037 | __func__, id, start, name, attrsize, command); |
1038 | ||
1039 | path_len = pohmelfs_path_length(pi); | |
1040 | if (path_len < 0) { | |
1041 | err = path_len; | |
1042 | goto err_out_exit; | |
1043 | } | |
1044 | ||
1045 | t = netfs_trans_alloc(psb, namelen + path_len + attrsize, 0, 0); | |
1046 | if (!t) { | |
1047 | err = -ENOMEM; | |
1048 | goto err_out_exit; | |
1049 | } | |
1050 | ||
1051 | cmd = netfs_trans_current(t); | |
1052 | data = cmd + 1; | |
1053 | ||
1054 | path_len = pohmelfs_construct_path_string(pi, data, path_len); | |
1055 | if (path_len < 0) { | |
1056 | err = path_len; | |
1057 | goto err_out_put; | |
1058 | } | |
1059 | data += path_len; | |
1060 | ||
1061 | /* | |
1062 | * 'name' is a NUL-terminated string already and | |
1063 | * 'namelen' includes 0-byte. | |
1064 | */ | |
1065 | memcpy(data, name, namelen); | |
1066 | data += namelen; | |
1067 | ||
1068 | memcpy(data, value, attrsize); | |
1069 | ||
1070 | cmd->cmd = command; | |
1071 | cmd->id = id; | |
1072 | cmd->start = start; | |
1073 | cmd->size = attrsize + namelen + path_len; | |
1074 | cmd->ext = path_len; | |
1075 | cmd->csize = 0; | |
1076 | cmd->cpad = 0; | |
1077 | ||
1078 | netfs_convert_cmd(cmd); | |
1079 | netfs_trans_update(cmd, t, namelen + path_len + attrsize); | |
1080 | ||
1081 | return netfs_trans_finish(t, psb); | |
1082 | ||
1083 | err_out_put: | |
1084 | t->result = err; | |
1085 | netfs_trans_put(t); | |
1086 | err_out_exit: | |
1087 | return err; | |
1088 | } | |
1089 | ||
1090 | static int pohmelfs_setxattr(struct dentry *dentry, const char *name, | |
1091 | const void *value, size_t attrsize, int flags) | |
1092 | { | |
1093 | struct inode *inode = dentry->d_inode; | |
1094 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
1095 | struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); | |
1096 | ||
1097 | if (!(psb->state_flags & POHMELFS_FLAGS_XATTR)) | |
1098 | return -EOPNOTSUPP; | |
1099 | ||
1100 | return pohmelfs_send_xattr_req(pi, flags, attrsize, name, | |
1101 | value, attrsize, NETFS_XATTR_SET); | |
1102 | } | |
1103 | ||
1104 | static ssize_t pohmelfs_getxattr(struct dentry *dentry, const char *name, | |
1105 | void *value, size_t attrsize) | |
1106 | { | |
1107 | struct inode *inode = dentry->d_inode; | |
1108 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
1109 | struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); | |
1110 | struct pohmelfs_mcache *m; | |
1111 | int err; | |
1112 | long timeout = psb->mcache_timeout; | |
1113 | ||
1114 | if (!(psb->state_flags & POHMELFS_FLAGS_XATTR)) | |
1115 | return -EOPNOTSUPP; | |
1116 | ||
1117 | m = pohmelfs_mcache_alloc(psb, 0, attrsize, value); | |
1118 | if (IS_ERR(m)) | |
1119 | return PTR_ERR(m); | |
1120 | ||
1121 | dprintk("%s: ino: %llu, name: '%s', size: %zu.\n", | |
1122 | __func__, pi->ino, name, attrsize); | |
1123 | ||
1124 | err = pohmelfs_send_xattr_req(pi, m->gen, attrsize, name, value, 0, NETFS_XATTR_GET); | |
1125 | if (err) | |
1126 | goto err_out_put; | |
1127 | ||
1128 | do { | |
1129 | err = wait_for_completion_timeout(&m->complete, timeout); | |
1130 | if (err) { | |
1131 | err = m->err; | |
1132 | break; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * This loop is a bit ugly, since it waits until reference counter | |
1137 | * hits 1 and then put object here. Main goal is to prevent race with | |
1138 | * network thread, when it can start processing given request, i.e. | |
1139 | * increase its reference counter but yet not complete it, while | |
1140 | * we will exit from ->getxattr() with timeout, and although request | |
1141 | * will not be freed (its reference counter was increased by network | |
1142 | * thread), data pointer provided by user may be released, so we will | |
1143 | * overwrite already freed area in network thread. | |
1144 | * | |
1145 | * Now after timeout we remove request from the cache, so it can not be | |
1146 | * found by network thread, and wait for its reference counter to hit 1, | |
1147 | * i.e. if network thread already started to process this request, we wait | |
1148 | * it to finish, and then free object locally. If reference counter is | |
1149 | * already 1, i.e. request is not used by anyone else, we can free it without | |
1150 | * problem. | |
1151 | */ | |
1152 | err = -ETIMEDOUT; | |
1153 | timeout = HZ; | |
1154 | ||
1155 | pohmelfs_mcache_remove_locked(psb, m); | |
1156 | } while (atomic_read(&m->refcnt) != 1); | |
1157 | ||
1158 | pohmelfs_mcache_put(psb, m); | |
1159 | ||
1160 | dprintk("%s: ino: %llu, err: %d.\n", __func__, pi->ino, err); | |
1161 | ||
1162 | return err; | |
1163 | ||
1164 | err_out_put: | |
1165 | pohmelfs_mcache_put(psb, m); | |
1166 | return err; | |
1167 | } | |
1168 | ||
1169 | static int pohmelfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
1170 | { | |
1171 | struct inode *inode = dentry->d_inode; | |
e5043424 | 1172 | #if 0 |
b3f08cad EP |
1173 | struct pohmelfs_inode *pi = POHMELFS_I(inode); |
1174 | int err; | |
e5043424 | 1175 | |
b3f08cad EP |
1176 | err = pohmelfs_data_lock(pi, 0, ~0, POHMELFS_READ_LOCK); |
1177 | if (err) | |
1178 | return err; | |
b3f08cad EP |
1179 | dprintk("%s: ino: %llu, mode: %o, uid: %u, gid: %u, size: %llu.\n", |
1180 | __func__, pi->ino, inode->i_mode, inode->i_uid, | |
1181 | inode->i_gid, inode->i_size); | |
e5043424 | 1182 | #endif |
b3f08cad EP |
1183 | |
1184 | generic_fillattr(inode, stat); | |
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | const struct inode_operations pohmelfs_file_inode_operations = { | |
1189 | .setattr = pohmelfs_setattr, | |
1190 | .getattr = pohmelfs_getattr, | |
1191 | .setxattr = pohmelfs_setxattr, | |
1192 | .getxattr = pohmelfs_getxattr, | |
1193 | }; | |
1194 | ||
1195 | /* | |
1196 | * Fill inode data: mode, size, operation callbacks and so on... | |
1197 | */ | |
1198 | void pohmelfs_fill_inode(struct inode *inode, struct netfs_inode_info *info) | |
1199 | { | |
1200 | inode->i_mode = info->mode; | |
1201 | inode->i_nlink = info->nlink; | |
1202 | inode->i_uid = info->uid; | |
1203 | inode->i_gid = info->gid; | |
1204 | inode->i_blocks = info->blocks; | |
1205 | inode->i_rdev = info->rdev; | |
1206 | inode->i_size = info->size; | |
1207 | inode->i_version = info->version; | |
1208 | inode->i_blkbits = ffs(info->blocksize); | |
1209 | ||
1210 | dprintk("%s: inode: %p, num: %lu/%llu inode is regular: %d, dir: %d, link: %d, mode: %o, size: %llu.\n", | |
1211 | __func__, inode, inode->i_ino, info->ino, | |
1212 | S_ISREG(inode->i_mode), S_ISDIR(inode->i_mode), | |
1213 | S_ISLNK(inode->i_mode), inode->i_mode, inode->i_size); | |
1214 | ||
1215 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
1216 | ||
1217 | /* | |
1218 | * i_mapping is a pointer to i_data during inode initialization. | |
1219 | */ | |
1220 | inode->i_data.a_ops = &pohmelfs_aops; | |
1221 | ||
1222 | if (S_ISREG(inode->i_mode)) { | |
1223 | inode->i_fop = &pohmelfs_file_ops; | |
1224 | inode->i_op = &pohmelfs_file_inode_operations; | |
1225 | } else if (S_ISDIR(inode->i_mode)) { | |
1226 | inode->i_fop = &pohmelfs_dir_fops; | |
1227 | inode->i_op = &pohmelfs_dir_inode_ops; | |
1228 | } else if (S_ISLNK(inode->i_mode)) { | |
1229 | inode->i_op = &pohmelfs_symlink_inode_operations; | |
1230 | inode->i_fop = &pohmelfs_file_ops; | |
1231 | } else { | |
1232 | inode->i_fop = &generic_ro_fops; | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | static void pohmelfs_drop_inode(struct inode *inode) | |
1237 | { | |
1238 | struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); | |
1239 | struct pohmelfs_inode *pi = POHMELFS_I(inode); | |
1240 | ||
1241 | spin_lock(&psb->ino_lock); | |
1242 | list_del_init(&pi->inode_entry); | |
1243 | spin_unlock(&psb->ino_lock); | |
1244 | ||
1245 | generic_drop_inode(inode); | |
1246 | } | |
1247 | ||
1248 | static struct pohmelfs_inode *pohmelfs_get_inode_from_list(struct pohmelfs_sb *psb, | |
1249 | struct list_head *head, unsigned int *count) | |
1250 | { | |
1251 | struct pohmelfs_inode *pi = NULL; | |
1252 | ||
1253 | spin_lock(&psb->ino_lock); | |
1254 | if (!list_empty(head)) { | |
1255 | pi = list_entry(head->next, struct pohmelfs_inode, | |
1256 | inode_entry); | |
1257 | list_del_init(&pi->inode_entry); | |
1258 | *count = pi->drop_count; | |
1259 | pi->drop_count = 0; | |
1260 | } | |
1261 | spin_unlock(&psb->ino_lock); | |
1262 | ||
1263 | return pi; | |
1264 | } | |
1265 | ||
1266 | static void pohmelfs_flush_transactions(struct pohmelfs_sb *psb) | |
1267 | { | |
1268 | struct pohmelfs_config *c; | |
1269 | ||
1270 | mutex_lock(&psb->state_lock); | |
1271 | list_for_each_entry(c, &psb->state_list, config_entry) { | |
1272 | pohmelfs_state_flush_transactions(&c->state); | |
1273 | } | |
1274 | mutex_unlock(&psb->state_lock); | |
1275 | } | |
1276 | ||
1277 | /* | |
1278 | * ->put_super() callback. Invoked before superblock is destroyed, | |
1279 | * so it has to clean all private data. | |
1280 | */ | |
1281 | static void pohmelfs_put_super(struct super_block *sb) | |
1282 | { | |
1283 | struct pohmelfs_sb *psb = POHMELFS_SB(sb); | |
1284 | struct pohmelfs_inode *pi; | |
1285 | unsigned int count; | |
1286 | unsigned int in_drop_list = 0; | |
1287 | struct inode *inode, *tmp; | |
1288 | ||
1289 | dprintk("%s.\n", __func__); | |
1290 | ||
1291 | /* | |
1292 | * Kill pending transactions, which could affect inodes in-flight. | |
1293 | */ | |
1294 | pohmelfs_flush_transactions(psb); | |
1295 | ||
1296 | while ((pi = pohmelfs_get_inode_from_list(psb, &psb->drop_list, &count))) { | |
1297 | inode = &pi->vfs_inode; | |
1298 | ||
1299 | dprintk("%s: ino: %llu, pi: %p, inode: %p, count: %u.\n", | |
1300 | __func__, pi->ino, pi, inode, count); | |
1301 | ||
1302 | if (atomic_read(&inode->i_count) != count) { | |
1303 | printk("%s: ino: %llu, pi: %p, inode: %p, count: %u, i_count: %d.\n", | |
1304 | __func__, pi->ino, pi, inode, count, | |
1305 | atomic_read(&inode->i_count)); | |
1306 | count = atomic_read(&inode->i_count); | |
1307 | in_drop_list++; | |
1308 | } | |
1309 | ||
1310 | while (count--) | |
1311 | iput(&pi->vfs_inode); | |
1312 | } | |
1313 | ||
1314 | list_for_each_entry_safe(inode, tmp, &sb->s_inodes, i_sb_list) { | |
1315 | pi = POHMELFS_I(inode); | |
1316 | ||
1317 | dprintk("%s: ino: %llu, pi: %p, inode: %p, i_count: %u.\n", | |
1318 | __func__, pi->ino, pi, inode, atomic_read(&inode->i_count)); | |
1319 | ||
1320 | /* | |
1321 | * These are special inodes, they were created during | |
1322 | * directory reading or lookup, and were not bound to dentry, | |
1323 | * so they live here with reference counter being 1 and prevent | |
1324 | * umount from succeed since it believes that they are busy. | |
1325 | */ | |
1326 | count = atomic_read(&inode->i_count); | |
1327 | if (count) { | |
1328 | list_del_init(&inode->i_sb_list); | |
1329 | while (count--) | |
1330 | iput(&pi->vfs_inode); | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | psb->trans_scan_timeout = psb->drop_scan_timeout = 0; | |
1335 | cancel_rearming_delayed_work(&psb->dwork); | |
1336 | cancel_rearming_delayed_work(&psb->drop_dwork); | |
1337 | flush_scheduled_work(); | |
1338 | ||
1339 | dprintk("%s: stopped workqueues.\n", __func__); | |
1340 | ||
1341 | pohmelfs_crypto_exit(psb); | |
1342 | pohmelfs_state_exit(psb); | |
1343 | ||
1344 | kfree(psb); | |
1345 | sb->s_fs_info = NULL; | |
b3f08cad EP |
1346 | } |
1347 | ||
b3f08cad EP |
1348 | static int pohmelfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1349 | { | |
1350 | struct super_block *sb = dentry->d_sb; | |
1351 | struct pohmelfs_sb *psb = POHMELFS_SB(sb); | |
1352 | ||
1353 | /* | |
1354 | * There are no filesystem size limits yet. | |
1355 | */ | |
1356 | memset(buf, 0, sizeof(struct kstatfs)); | |
1357 | ||
1358 | buf->f_type = POHMELFS_MAGIC_NUM; /* 'POH.' */ | |
1359 | buf->f_bsize = sb->s_blocksize; | |
1360 | buf->f_files = psb->ino; | |
1361 | buf->f_namelen = 255; | |
1362 | buf->f_files = atomic_long_read(&psb->total_inodes); | |
1363 | buf->f_bfree = buf->f_bavail = psb->avail_size >> PAGE_SHIFT; | |
1364 | buf->f_blocks = psb->total_size >> PAGE_SHIFT; | |
1365 | ||
1366 | dprintk("%s: total: %llu, avail: %llu, inodes: %llu, bsize: %lu.\n", | |
1367 | __func__, psb->total_size, psb->avail_size, buf->f_files, sb->s_blocksize); | |
1368 | ||
1369 | return 0; | |
1370 | } | |
1371 | ||
1372 | static int pohmelfs_show_options(struct seq_file *seq, struct vfsmount *vfs) | |
1373 | { | |
1374 | struct pohmelfs_sb *psb = POHMELFS_SB(vfs->mnt_sb); | |
1375 | ||
1376 | seq_printf(seq, ",idx=%u", psb->idx); | |
1377 | seq_printf(seq, ",trans_scan_timeout=%u", jiffies_to_msecs(psb->trans_scan_timeout)); | |
1378 | seq_printf(seq, ",drop_scan_timeout=%u", jiffies_to_msecs(psb->drop_scan_timeout)); | |
1379 | seq_printf(seq, ",wait_on_page_timeout=%u", jiffies_to_msecs(psb->wait_on_page_timeout)); | |
1380 | seq_printf(seq, ",trans_retries=%u", psb->trans_retries); | |
1381 | seq_printf(seq, ",crypto_thread_num=%u", psb->crypto_thread_num); | |
1382 | seq_printf(seq, ",trans_max_pages=%u", psb->trans_max_pages); | |
1383 | seq_printf(seq, ",mcache_timeout=%u", jiffies_to_msecs(psb->mcache_timeout)); | |
1384 | if (psb->crypto_fail_unsupported) | |
1385 | seq_printf(seq, ",crypto_fail_unsupported"); | |
1386 | ||
1387 | return 0; | |
1388 | } | |
1389 | ||
b3f08cad EP |
1390 | enum { |
1391 | pohmelfs_opt_idx, | |
e5043424 EP |
1392 | pohmelfs_opt_crypto_thread_num, |
1393 | pohmelfs_opt_trans_max_pages, | |
1394 | pohmelfs_opt_crypto_fail_unsupported, | |
1395 | ||
1396 | /* Remountable options */ | |
b3f08cad EP |
1397 | pohmelfs_opt_trans_scan_timeout, |
1398 | pohmelfs_opt_drop_scan_timeout, | |
1399 | pohmelfs_opt_wait_on_page_timeout, | |
1400 | pohmelfs_opt_trans_retries, | |
b3f08cad EP |
1401 | pohmelfs_opt_mcache_timeout, |
1402 | }; | |
1403 | ||
1404 | static struct match_token pohmelfs_tokens[] = { | |
1405 | {pohmelfs_opt_idx, "idx=%u"}, | |
e5043424 EP |
1406 | {pohmelfs_opt_crypto_thread_num, "crypto_thread_num=%u"}, |
1407 | {pohmelfs_opt_trans_max_pages, "trans_max_pages=%u"}, | |
1408 | {pohmelfs_opt_crypto_fail_unsupported, "crypto_fail_unsupported"}, | |
b3f08cad EP |
1409 | {pohmelfs_opt_trans_scan_timeout, "trans_scan_timeout=%u"}, |
1410 | {pohmelfs_opt_drop_scan_timeout, "drop_scan_timeout=%u"}, | |
1411 | {pohmelfs_opt_wait_on_page_timeout, "wait_on_page_timeout=%u"}, | |
1412 | {pohmelfs_opt_trans_retries, "trans_retries=%u"}, | |
b3f08cad EP |
1413 | {pohmelfs_opt_mcache_timeout, "mcache_timeout=%u"}, |
1414 | }; | |
1415 | ||
e5043424 | 1416 | static int pohmelfs_parse_options(char *options, struct pohmelfs_sb *psb, int remount) |
b3f08cad EP |
1417 | { |
1418 | char *p; | |
1419 | substring_t args[MAX_OPT_ARGS]; | |
1420 | int option, err; | |
1421 | ||
1422 | if (!options) | |
1423 | return 0; | |
1424 | ||
1425 | while ((p = strsep(&options, ",")) != NULL) { | |
1426 | int token; | |
1427 | if (!*p) | |
1428 | continue; | |
1429 | ||
1430 | token = match_token(p, pohmelfs_tokens, args); | |
1431 | ||
1432 | err = match_int(&args[0], &option); | |
1433 | if (err) | |
1434 | return err; | |
1435 | ||
e5043424 EP |
1436 | if (remount && token <= pohmelfs_opt_crypto_fail_unsupported) |
1437 | continue; | |
1438 | ||
b3f08cad EP |
1439 | switch (token) { |
1440 | case pohmelfs_opt_idx: | |
1441 | psb->idx = option; | |
1442 | break; | |
1443 | case pohmelfs_opt_trans_scan_timeout: | |
1444 | psb->trans_scan_timeout = msecs_to_jiffies(option); | |
1445 | break; | |
1446 | case pohmelfs_opt_drop_scan_timeout: | |
1447 | psb->drop_scan_timeout = msecs_to_jiffies(option); | |
1448 | break; | |
1449 | case pohmelfs_opt_wait_on_page_timeout: | |
1450 | psb->wait_on_page_timeout = msecs_to_jiffies(option); | |
1451 | break; | |
1452 | case pohmelfs_opt_mcache_timeout: | |
1453 | psb->mcache_timeout = msecs_to_jiffies(option); | |
1454 | break; | |
1455 | case pohmelfs_opt_trans_retries: | |
1456 | psb->trans_retries = option; | |
1457 | break; | |
1458 | case pohmelfs_opt_crypto_thread_num: | |
1459 | psb->crypto_thread_num = option; | |
1460 | break; | |
1461 | case pohmelfs_opt_trans_max_pages: | |
1462 | psb->trans_max_pages = option; | |
1463 | break; | |
1464 | case pohmelfs_opt_crypto_fail_unsupported: | |
1465 | psb->crypto_fail_unsupported = 1; | |
1466 | break; | |
1467 | default: | |
1468 | return -EINVAL; | |
1469 | } | |
1470 | } | |
1471 | ||
1472 | return 0; | |
1473 | } | |
1474 | ||
e5043424 EP |
1475 | static int pohmelfs_remount(struct super_block *sb, int *flags, char *data) |
1476 | { | |
1477 | int err; | |
1478 | struct pohmelfs_sb *psb = POHMELFS_SB(sb); | |
1479 | unsigned long old_sb_flags = sb->s_flags; | |
1480 | ||
1481 | err = pohmelfs_parse_options(data, psb, 1); | |
1482 | if (err) | |
1483 | goto err_out_restore; | |
1484 | ||
1485 | if (!(*flags & MS_RDONLY)) | |
1486 | sb->s_flags &= ~MS_RDONLY; | |
1487 | return 0; | |
1488 | ||
1489 | err_out_restore: | |
1490 | sb->s_flags = old_sb_flags; | |
1491 | return err; | |
1492 | } | |
1493 | ||
b3f08cad EP |
1494 | static void pohmelfs_flush_inode(struct pohmelfs_inode *pi, unsigned int count) |
1495 | { | |
1496 | struct inode *inode = &pi->vfs_inode; | |
1497 | ||
1498 | dprintk("%s: %p: ino: %llu, owned: %d.\n", | |
1499 | __func__, inode, pi->ino, test_bit(NETFS_INODE_OWNED, &pi->state)); | |
1500 | ||
1501 | mutex_lock(&inode->i_mutex); | |
1502 | if (test_and_clear_bit(NETFS_INODE_OWNED, &pi->state)) { | |
1503 | filemap_fdatawrite(inode->i_mapping); | |
1504 | inode->i_sb->s_op->write_inode(inode, 0); | |
1505 | } | |
1506 | ||
1507 | truncate_inode_pages(inode->i_mapping, 0); | |
1508 | ||
1509 | pohmelfs_data_unlock(pi, 0, ~0, POHMELFS_WRITE_LOCK); | |
1510 | mutex_unlock(&inode->i_mutex); | |
1511 | } | |
1512 | ||
1513 | static void pohmelfs_put_inode_count(struct pohmelfs_inode *pi, unsigned int count) | |
1514 | { | |
1515 | dprintk("%s: ino: %llu, pi: %p, inode: %p, count: %u.\n", | |
1516 | __func__, pi->ino, pi, &pi->vfs_inode, count); | |
1517 | ||
1518 | if (test_and_clear_bit(NETFS_INODE_NEED_FLUSH, &pi->state)) | |
1519 | pohmelfs_flush_inode(pi, count); | |
1520 | ||
1521 | while (count--) | |
1522 | iput(&pi->vfs_inode); | |
1523 | } | |
1524 | ||
1525 | static void pohmelfs_drop_scan(struct work_struct *work) | |
1526 | { | |
1527 | struct pohmelfs_sb *psb = | |
1528 | container_of(work, struct pohmelfs_sb, drop_dwork.work); | |
1529 | struct pohmelfs_inode *pi; | |
1530 | unsigned int count = 0; | |
1531 | ||
1532 | while ((pi = pohmelfs_get_inode_from_list(psb, &psb->drop_list, &count))) { | |
1533 | pohmelfs_put_inode_count(pi, count); | |
1534 | } | |
1535 | pohmelfs_check_states(psb); | |
1536 | ||
1537 | if (psb->drop_scan_timeout) | |
1538 | schedule_delayed_work(&psb->drop_dwork, psb->drop_scan_timeout); | |
1539 | } | |
1540 | ||
1541 | /* | |
1542 | * Run through all transactions starting from the oldest, | |
1543 | * drop transaction from current state and try to send it | |
1544 | * to all remote nodes, which are currently installed. | |
1545 | */ | |
1546 | static void pohmelfs_trans_scan_state(struct netfs_state *st) | |
1547 | { | |
1548 | struct rb_node *rb_node; | |
1549 | struct netfs_trans_dst *dst; | |
1550 | struct pohmelfs_sb *psb = st->psb; | |
1551 | unsigned int timeout = psb->trans_scan_timeout; | |
1552 | struct netfs_trans *t; | |
1553 | int err; | |
1554 | ||
1555 | mutex_lock(&st->trans_lock); | |
1556 | for (rb_node = rb_first(&st->trans_root); rb_node; ) { | |
1557 | dst = rb_entry(rb_node, struct netfs_trans_dst, state_entry); | |
1558 | t = dst->trans; | |
1559 | ||
1560 | if (timeout && time_after(dst->send_time + timeout, jiffies) | |
1561 | && dst->retries == 0) | |
1562 | break; | |
1563 | ||
1564 | dprintk("%s: t: %p, gen: %u, st: %p, retries: %u, max: %u.\n", | |
1565 | __func__, t, t->gen, st, dst->retries, psb->trans_retries); | |
1566 | netfs_trans_get(t); | |
1567 | ||
1568 | rb_node = rb_next(rb_node); | |
1569 | ||
1570 | err = -ETIMEDOUT; | |
1571 | if (timeout && (++dst->retries < psb->trans_retries)) { | |
1572 | err = netfs_trans_resend(t, psb); | |
1573 | } | |
1574 | ||
1575 | if (err || (t->flags & NETFS_TRANS_SINGLE_DST)) { | |
1576 | if (netfs_trans_remove_nolock(dst, st)) | |
1577 | netfs_trans_drop_dst_nostate(dst); | |
1578 | } | |
1579 | ||
1580 | t->result = err; | |
1581 | netfs_trans_put(t); | |
1582 | } | |
1583 | mutex_unlock(&st->trans_lock); | |
1584 | } | |
1585 | ||
1586 | /* | |
1587 | * Walk through all installed network states and resend all | |
1588 | * transactions, which are old enough. | |
1589 | */ | |
1590 | static void pohmelfs_trans_scan(struct work_struct *work) | |
1591 | { | |
1592 | struct pohmelfs_sb *psb = | |
1593 | container_of(work, struct pohmelfs_sb, dwork.work); | |
1594 | struct netfs_state *st; | |
1595 | struct pohmelfs_config *c; | |
1596 | ||
1597 | mutex_lock(&psb->state_lock); | |
1598 | list_for_each_entry(c, &psb->state_list, config_entry) { | |
1599 | st = &c->state; | |
1600 | ||
1601 | pohmelfs_trans_scan_state(st); | |
1602 | } | |
1603 | mutex_unlock(&psb->state_lock); | |
1604 | ||
1605 | /* | |
1606 | * If no timeout specified then system is in the middle of umount process, | |
1607 | * so no need to reschedule scanning process again. | |
1608 | */ | |
1609 | if (psb->trans_scan_timeout) | |
1610 | schedule_delayed_work(&psb->dwork, psb->trans_scan_timeout); | |
1611 | } | |
1612 | ||
1613 | int pohmelfs_meta_command_data(struct pohmelfs_inode *pi, u64 id, unsigned int cmd_op, char *addon, | |
1614 | unsigned int flags, netfs_trans_complete_t complete, void *priv, u64 start) | |
1615 | { | |
1616 | struct inode *inode = &pi->vfs_inode; | |
1617 | struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb); | |
1618 | int err = 0, sz; | |
1619 | struct netfs_trans *t; | |
1620 | int path_len, addon_len = 0; | |
1621 | void *data; | |
1622 | struct netfs_inode_info *info; | |
1623 | struct netfs_cmd *cmd; | |
1624 | ||
1625 | dprintk("%s: ino: %llu, cmd: %u, addon: %p.\n", __func__, pi->ino, cmd_op, addon); | |
1626 | ||
1627 | path_len = pohmelfs_path_length(pi); | |
1628 | if (path_len < 0) { | |
1629 | err = path_len; | |
1630 | goto err_out_exit; | |
1631 | } | |
1632 | ||
1633 | if (addon) | |
1634 | addon_len = strlen(addon) + 1; /* 0-byte */ | |
1635 | sz = addon_len; | |
1636 | ||
1637 | if (cmd_op == NETFS_INODE_INFO) | |
1638 | sz += sizeof(struct netfs_inode_info); | |
1639 | ||
1640 | t = netfs_trans_alloc(psb, sz + path_len, flags, 0); | |
1641 | if (!t) { | |
1642 | err = -ENOMEM; | |
1643 | goto err_out_exit; | |
1644 | } | |
1645 | t->complete = complete; | |
1646 | t->private = priv; | |
1647 | ||
1648 | cmd = netfs_trans_current(t); | |
1649 | data = (void *)(cmd + 1); | |
1650 | ||
1651 | if (cmd_op == NETFS_INODE_INFO) { | |
1652 | info = (struct netfs_inode_info *)(cmd + 1); | |
1653 | data = (void *)(info + 1); | |
1654 | ||
1655 | /* | |
1656 | * We are under i_mutex, can read and change whatever we want... | |
1657 | */ | |
1658 | info->mode = inode->i_mode; | |
1659 | info->nlink = inode->i_nlink; | |
1660 | info->uid = inode->i_uid; | |
1661 | info->gid = inode->i_gid; | |
1662 | info->blocks = inode->i_blocks; | |
1663 | info->rdev = inode->i_rdev; | |
1664 | info->size = inode->i_size; | |
1665 | info->version = inode->i_version; | |
1666 | ||
1667 | netfs_convert_inode_info(info); | |
1668 | } | |
1669 | ||
1670 | path_len = pohmelfs_construct_path_string(pi, data, path_len); | |
1671 | if (path_len < 0) | |
1672 | goto err_out_free; | |
1673 | ||
1674 | dprintk("%s: path_len: %d.\n", __func__, path_len); | |
1675 | ||
1676 | if (addon) { | |
1677 | path_len--; /* Do not place null-byte before the addon */ | |
1678 | path_len += sprintf(data + path_len, "/%s", addon) + 1; /* 0 - byte */ | |
1679 | } | |
1680 | ||
1681 | sz += path_len; | |
1682 | ||
1683 | cmd->cmd = cmd_op; | |
1684 | cmd->ext = path_len; | |
1685 | cmd->size = sz; | |
1686 | cmd->id = id; | |
1687 | cmd->start = start; | |
1688 | ||
1689 | netfs_convert_cmd(cmd); | |
1690 | netfs_trans_update(cmd, t, sz); | |
1691 | ||
1692 | /* | |
1693 | * Note, that it is possible to leak error here: transaction callback will not | |
1694 | * be invoked for allocation path failure. | |
1695 | */ | |
1696 | return netfs_trans_finish(t, psb); | |
1697 | ||
1698 | err_out_free: | |
1699 | netfs_trans_free(t); | |
1700 | err_out_exit: | |
1701 | if (complete) | |
1702 | complete(NULL, 0, priv, err); | |
1703 | return err; | |
1704 | } | |
1705 | ||
1706 | int pohmelfs_meta_command(struct pohmelfs_inode *pi, unsigned int cmd_op, unsigned int flags, | |
1707 | netfs_trans_complete_t complete, void *priv, u64 start) | |
1708 | { | |
1709 | return pohmelfs_meta_command_data(pi, pi->ino, cmd_op, NULL, flags, complete, priv, start); | |
1710 | } | |
1711 | ||
1712 | /* | |
1713 | * Send request and wait for POHMELFS root capabilities response, | |
1714 | * which will update server's informaion about size of the export, | |
1715 | * permissions, number of objects, available size and so on. | |
1716 | */ | |
1717 | static int pohmelfs_root_handshake(struct pohmelfs_sb *psb) | |
1718 | { | |
1719 | struct netfs_trans *t; | |
1720 | struct netfs_cmd *cmd; | |
1721 | int err = -ENOMEM; | |
1722 | ||
1723 | t = netfs_trans_alloc(psb, 0, 0, 0); | |
1724 | if (!t) | |
1725 | goto err_out_exit; | |
1726 | ||
1727 | cmd = netfs_trans_current(t); | |
1728 | ||
1729 | cmd->cmd = NETFS_CAPABILITIES; | |
1730 | cmd->id = POHMELFS_ROOT_CAPABILITIES; | |
1731 | cmd->size = 0; | |
1732 | cmd->start = 0; | |
1733 | cmd->ext = 0; | |
1734 | cmd->csize = 0; | |
1735 | ||
1736 | netfs_convert_cmd(cmd); | |
1737 | netfs_trans_update(cmd, t, 0); | |
1738 | ||
1739 | err = netfs_trans_finish(t, psb); | |
1740 | if (err) | |
1741 | goto err_out_exit; | |
1742 | ||
1743 | psb->flags = ~0; | |
1744 | err = wait_event_interruptible_timeout(psb->wait, | |
1745 | (psb->flags != ~0), | |
1746 | psb->wait_on_page_timeout); | |
1747 | if (!err) { | |
1748 | err = -ETIMEDOUT; | |
1749 | } else { | |
1750 | err = -psb->flags; | |
1751 | } | |
1752 | ||
1753 | if (err) | |
1754 | goto err_out_exit; | |
1755 | ||
1756 | return 0; | |
1757 | ||
1758 | err_out_exit: | |
1759 | return err; | |
1760 | } | |
1761 | ||
f2739de1 EP |
1762 | static int pohmelfs_show_stats(struct seq_file *m, struct vfsmount *mnt) |
1763 | { | |
1764 | struct netfs_state *st; | |
1765 | struct pohmelfs_ctl *ctl; | |
1766 | struct pohmelfs_sb *psb = POHMELFS_SB(mnt->mnt_sb); | |
1767 | struct pohmelfs_config *c; | |
1768 | ||
1769 | mutex_lock(&psb->state_lock); | |
1770 | ||
1771 | seq_printf(m, "\nidx addr(:port) socket_type protocol active priority permissions\n"); | |
1772 | ||
1773 | list_for_each_entry(c, &psb->state_list, config_entry) { | |
1774 | st = &c->state; | |
1775 | ctl = &st->ctl; | |
1776 | ||
1777 | seq_printf(m, "%u ", ctl->idx); | |
1778 | if (ctl->addr.sa_family == AF_INET) { | |
1779 | struct sockaddr_in *sin = (struct sockaddr_in *)&st->ctl.addr; | |
1780 | //seq_printf(m, "%pi4:%u", &sin->sin_addr.s_addr, ntohs(sin->sin_port)); | |
1781 | seq_printf(m, "%u.%u.%u.%u:%u", NIPQUAD(sin->sin_addr.s_addr), ntohs(sin->sin_port)); | |
1782 | } else if (ctl->addr.sa_family == AF_INET6) { | |
1783 | struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&st->ctl.addr; | |
1784 | seq_printf(m, "%pi6:%u", &sin->sin6_addr, ntohs(sin->sin6_port)); | |
1785 | } else { | |
1786 | unsigned int i; | |
1787 | for (i=0; i<ctl->addrlen; ++i) | |
1788 | seq_printf(m, "%02x.", ctl->addr.addr[i]); | |
1789 | } | |
1790 | ||
1791 | seq_printf(m, " %u %u %d %u %x\n", | |
1792 | ctl->type, ctl->proto, | |
1793 | st->socket != NULL, | |
1794 | ctl->prio, ctl->perm); | |
1795 | } | |
1796 | mutex_unlock(&psb->state_lock); | |
1797 | ||
1798 | return 0; | |
1799 | } | |
1800 | ||
e5043424 EP |
1801 | static const struct super_operations pohmelfs_sb_ops = { |
1802 | .alloc_inode = pohmelfs_alloc_inode, | |
1803 | .destroy_inode = pohmelfs_destroy_inode, | |
1804 | .drop_inode = pohmelfs_drop_inode, | |
1805 | .write_inode = pohmelfs_write_inode, | |
1806 | .put_super = pohmelfs_put_super, | |
1807 | .remount_fs = pohmelfs_remount, | |
1808 | .statfs = pohmelfs_statfs, | |
1809 | .show_options = pohmelfs_show_options, | |
f2739de1 | 1810 | .show_stats = pohmelfs_show_stats, |
e5043424 EP |
1811 | }; |
1812 | ||
b3f08cad EP |
1813 | /* |
1814 | * Allocate private superblock and create root dir. | |
1815 | */ | |
1816 | static int pohmelfs_fill_super(struct super_block *sb, void *data, int silent) | |
1817 | { | |
1818 | struct pohmelfs_sb *psb; | |
1819 | int err = -ENOMEM; | |
1820 | struct inode *root; | |
1821 | struct pohmelfs_inode *npi; | |
1822 | struct qstr str; | |
1823 | ||
b3f08cad EP |
1824 | psb = kzalloc(sizeof(struct pohmelfs_sb), GFP_KERNEL); |
1825 | if (!psb) | |
1826 | goto err_out_exit; | |
1827 | ||
1828 | sb->s_fs_info = psb; | |
1829 | sb->s_op = &pohmelfs_sb_ops; | |
1830 | sb->s_magic = POHMELFS_MAGIC_NUM; | |
1831 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1832 | sb->s_blocksize = PAGE_SIZE; | |
1833 | ||
1834 | psb->sb = sb; | |
1835 | ||
1836 | psb->ino = 2; | |
1837 | psb->idx = 0; | |
1838 | psb->active_state = NULL; | |
1839 | psb->trans_retries = 5; | |
1840 | psb->trans_data_size = PAGE_SIZE; | |
1841 | psb->drop_scan_timeout = msecs_to_jiffies(1000); | |
1842 | psb->trans_scan_timeout = msecs_to_jiffies(5000); | |
1843 | psb->wait_on_page_timeout = msecs_to_jiffies(5000); | |
1844 | init_waitqueue_head(&psb->wait); | |
1845 | ||
1846 | spin_lock_init(&psb->ino_lock); | |
1847 | ||
1848 | INIT_LIST_HEAD(&psb->drop_list); | |
1849 | ||
1850 | mutex_init(&psb->mcache_lock); | |
1851 | psb->mcache_root = RB_ROOT; | |
1852 | psb->mcache_timeout = msecs_to_jiffies(5000); | |
1853 | atomic_long_set(&psb->mcache_gen, 0); | |
1854 | ||
1855 | psb->trans_max_pages = 100; | |
1856 | ||
1857 | psb->crypto_align_size = 16; | |
1858 | psb->crypto_attached_size = 0; | |
1859 | psb->hash_strlen = 0; | |
1860 | psb->cipher_strlen = 0; | |
1861 | psb->perform_crypto = 0; | |
1862 | psb->crypto_thread_num = 2; | |
1863 | psb->crypto_fail_unsupported = 0; | |
1864 | mutex_init(&psb->crypto_thread_lock); | |
1865 | INIT_LIST_HEAD(&psb->crypto_ready_list); | |
1866 | INIT_LIST_HEAD(&psb->crypto_active_list); | |
1867 | ||
1868 | atomic_set(&psb->trans_gen, 1); | |
1869 | atomic_set(&psb->total_inodes, 0); | |
1870 | ||
1871 | mutex_init(&psb->state_lock); | |
1872 | INIT_LIST_HEAD(&psb->state_list); | |
1873 | ||
e5043424 | 1874 | err = pohmelfs_parse_options((char *) data, psb, 0); |
b3f08cad EP |
1875 | if (err) |
1876 | goto err_out_free_sb; | |
1877 | ||
1878 | err = pohmelfs_copy_crypto(psb); | |
1879 | if (err) | |
1880 | goto err_out_free_sb; | |
1881 | ||
1882 | err = pohmelfs_state_init(psb); | |
1883 | if (err) | |
1884 | goto err_out_free_strings; | |
1885 | ||
1886 | err = pohmelfs_crypto_init(psb); | |
1887 | if (err) | |
1888 | goto err_out_state_exit; | |
1889 | ||
1890 | err = pohmelfs_root_handshake(psb); | |
1891 | if (err) | |
1892 | goto err_out_crypto_exit; | |
1893 | ||
1894 | str.name = "/"; | |
1895 | str.hash = jhash("/", 1, 0); | |
1896 | str.len = 1; | |
1897 | ||
1898 | npi = pohmelfs_create_entry_local(psb, NULL, &str, 0, 0755|S_IFDIR); | |
1899 | if (IS_ERR(npi)) { | |
1900 | err = PTR_ERR(npi); | |
1901 | goto err_out_crypto_exit; | |
1902 | } | |
872dc5e5 EP |
1903 | set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state); |
1904 | clear_bit(NETFS_INODE_OWNED, &npi->state); | |
b3f08cad EP |
1905 | |
1906 | root = &npi->vfs_inode; | |
1907 | ||
1908 | sb->s_root = d_alloc_root(root); | |
1909 | if (!sb->s_root) | |
1910 | goto err_out_put_root; | |
1911 | ||
1912 | INIT_DELAYED_WORK(&psb->drop_dwork, pohmelfs_drop_scan); | |
1913 | schedule_delayed_work(&psb->drop_dwork, psb->drop_scan_timeout); | |
1914 | ||
1915 | INIT_DELAYED_WORK(&psb->dwork, pohmelfs_trans_scan); | |
1916 | schedule_delayed_work(&psb->dwork, psb->trans_scan_timeout); | |
1917 | ||
1918 | return 0; | |
1919 | ||
1920 | err_out_put_root: | |
1921 | iput(root); | |
1922 | err_out_crypto_exit: | |
1923 | pohmelfs_crypto_exit(psb); | |
1924 | err_out_state_exit: | |
1925 | pohmelfs_state_exit(psb); | |
1926 | err_out_free_strings: | |
1927 | kfree(psb->cipher_string); | |
1928 | kfree(psb->hash_string); | |
1929 | err_out_free_sb: | |
1930 | kfree(psb); | |
1931 | err_out_exit: | |
1932 | ||
1933 | dprintk("%s: err: %d.\n", __func__, err); | |
1934 | return err; | |
1935 | } | |
1936 | ||
1937 | /* | |
1938 | * Some VFS magic here... | |
1939 | */ | |
1940 | static int pohmelfs_get_sb(struct file_system_type *fs_type, | |
1941 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1942 | { | |
1943 | return get_sb_nodev(fs_type, flags, data, pohmelfs_fill_super, | |
1944 | mnt); | |
1945 | } | |
1946 | ||
cee9bb2e EP |
1947 | /* |
1948 | * We need this to sync all inodes earlier, since when writeback | |
1949 | * is invoked from the umount/mntput path dcache is already shrunk, | |
1950 | * see generic_shutdown_super(), and no inodes can access the path. | |
1951 | */ | |
1952 | static void pohmelfs_kill_super(struct super_block *sb) | |
1953 | { | |
1954 | struct writeback_control wbc = { | |
1955 | .sync_mode = WB_SYNC_ALL, | |
1956 | .range_start = 0, | |
1957 | .range_end = LLONG_MAX, | |
1958 | .nr_to_write = LONG_MAX, | |
1959 | }; | |
1960 | generic_sync_sb_inodes(sb, &wbc); | |
1961 | ||
1962 | kill_anon_super(sb); | |
1963 | } | |
1964 | ||
b3f08cad EP |
1965 | static struct file_system_type pohmel_fs_type = { |
1966 | .owner = THIS_MODULE, | |
1967 | .name = "pohmel", | |
1968 | .get_sb = pohmelfs_get_sb, | |
cee9bb2e | 1969 | .kill_sb = pohmelfs_kill_super, |
b3f08cad EP |
1970 | }; |
1971 | ||
1972 | /* | |
1973 | * Cache and module initializations and freeing routings. | |
1974 | */ | |
1975 | static void pohmelfs_init_once(void *data) | |
1976 | { | |
1977 | struct pohmelfs_inode *pi = data; | |
1978 | ||
1979 | inode_init_once(&pi->vfs_inode); | |
1980 | } | |
1981 | ||
1982 | static int __init pohmelfs_init_inodecache(void) | |
1983 | { | |
1984 | pohmelfs_inode_cache = kmem_cache_create("pohmelfs_inode_cache", | |
1985 | sizeof(struct pohmelfs_inode), | |
1986 | 0, (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), | |
1987 | pohmelfs_init_once); | |
1988 | if (!pohmelfs_inode_cache) | |
1989 | return -ENOMEM; | |
1990 | ||
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | static void pohmelfs_destroy_inodecache(void) | |
1995 | { | |
1996 | kmem_cache_destroy(pohmelfs_inode_cache); | |
1997 | } | |
1998 | ||
1999 | static int __init init_pohmel_fs(void) | |
2000 | { | |
2001 | int err; | |
2002 | ||
2003 | err = pohmelfs_config_init(); | |
2004 | if (err) | |
2005 | goto err_out_exit; | |
2006 | ||
2007 | err = pohmelfs_init_inodecache(); | |
2008 | if (err) | |
2009 | goto err_out_config_exit; | |
2010 | ||
2011 | err = pohmelfs_mcache_init(); | |
2012 | if (err) | |
2013 | goto err_out_destroy; | |
2014 | ||
2015 | err = netfs_trans_init(); | |
2016 | if (err) | |
2017 | goto err_out_mcache_exit; | |
2018 | ||
2019 | err = register_filesystem(&pohmel_fs_type); | |
2020 | if (err) | |
2021 | goto err_out_trans; | |
2022 | ||
2023 | return 0; | |
2024 | ||
2025 | err_out_trans: | |
2026 | netfs_trans_exit(); | |
2027 | err_out_mcache_exit: | |
2028 | pohmelfs_mcache_exit(); | |
2029 | err_out_destroy: | |
2030 | pohmelfs_destroy_inodecache(); | |
2031 | err_out_config_exit: | |
2032 | pohmelfs_config_exit(); | |
2033 | err_out_exit: | |
2034 | return err; | |
2035 | } | |
2036 | ||
2037 | static void __exit exit_pohmel_fs(void) | |
2038 | { | |
2039 | unregister_filesystem(&pohmel_fs_type); | |
2040 | pohmelfs_destroy_inodecache(); | |
2041 | pohmelfs_mcache_exit(); | |
2042 | pohmelfs_config_exit(); | |
2043 | netfs_trans_exit(); | |
2044 | } | |
2045 | ||
2046 | module_init(init_pohmel_fs); | |
2047 | module_exit(exit_pohmel_fs); | |
2048 | ||
2049 | MODULE_LICENSE("GPL"); | |
2050 | MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); | |
2051 | MODULE_DESCRIPTION("Pohmel filesystem"); |