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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
31143d5d DH |
2 | /* handling of writes to regular files and writing back to the server |
3 | * | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
31143d5d | 6 | */ |
4343d008 | 7 | |
4af3c9cc | 8 | #include <linux/backing-dev.h> |
31143d5d DH |
9 | #include <linux/slab.h> |
10 | #include <linux/fs.h> | |
11 | #include <linux/pagemap.h> | |
12 | #include <linux/writeback.h> | |
13 | #include <linux/pagevec.h> | |
14 | #include "internal.h" | |
15 | ||
31143d5d DH |
16 | /* |
17 | * mark a page as having been made dirty and thus needing writeback | |
18 | */ | |
19 | int afs_set_page_dirty(struct page *page) | |
20 | { | |
21 | _enter(""); | |
22 | return __set_page_dirty_nobuffers(page); | |
23 | } | |
24 | ||
31143d5d DH |
25 | /* |
26 | * partly or wholly fill a page that's under preparation for writing | |
27 | */ | |
28 | static int afs_fill_page(struct afs_vnode *vnode, struct key *key, | |
e8e581a8 | 29 | loff_t pos, unsigned int len, struct page *page) |
31143d5d | 30 | { |
196ee9cd | 31 | struct afs_read *req; |
2a0b4f64 DH |
32 | size_t p; |
33 | void *data; | |
31143d5d DH |
34 | int ret; |
35 | ||
5e7f2337 | 36 | _enter(",,%llu", (unsigned long long)pos); |
31143d5d | 37 | |
2a0b4f64 DH |
38 | if (pos >= vnode->vfs_inode.i_size) { |
39 | p = pos & ~PAGE_MASK; | |
40 | ASSERTCMP(p + len, <=, PAGE_SIZE); | |
41 | data = kmap(page); | |
42 | memset(data + p, 0, len); | |
43 | kunmap(page); | |
44 | return 0; | |
45 | } | |
46 | ||
ee102584 | 47 | req = kzalloc(struct_size(req, array, 1), GFP_KERNEL); |
196ee9cd DH |
48 | if (!req) |
49 | return -ENOMEM; | |
50 | ||
f3ddee8d | 51 | refcount_set(&req->usage, 1); |
196ee9cd | 52 | req->pos = pos; |
e8e581a8 | 53 | req->len = len; |
196ee9cd | 54 | req->nr_pages = 1; |
f3ddee8d | 55 | req->pages = req->array; |
196ee9cd | 56 | req->pages[0] = page; |
5611ef28 | 57 | get_page(page); |
196ee9cd | 58 | |
d2ddc776 | 59 | ret = afs_fetch_data(vnode, key, req); |
196ee9cd | 60 | afs_put_read(req); |
31143d5d DH |
61 | if (ret < 0) { |
62 | if (ret == -ENOENT) { | |
63 | _debug("got NOENT from server" | |
64 | " - marking file deleted and stale"); | |
65 | set_bit(AFS_VNODE_DELETED, &vnode->flags); | |
66 | ret = -ESTALE; | |
67 | } | |
68 | } | |
69 | ||
70 | _leave(" = %d", ret); | |
71 | return ret; | |
72 | } | |
73 | ||
31143d5d DH |
74 | /* |
75 | * prepare to perform part of a write to a page | |
31143d5d | 76 | */ |
15b4650e NP |
77 | int afs_write_begin(struct file *file, struct address_space *mapping, |
78 | loff_t pos, unsigned len, unsigned flags, | |
79 | struct page **pagep, void **fsdata) | |
31143d5d | 80 | { |
496ad9aa | 81 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); |
15b4650e | 82 | struct page *page; |
215804a9 | 83 | struct key *key = afs_file_key(file); |
4343d008 DH |
84 | unsigned long priv; |
85 | unsigned f, from = pos & (PAGE_SIZE - 1); | |
86 | unsigned t, to = from + len; | |
09cbfeaf | 87 | pgoff_t index = pos >> PAGE_SHIFT; |
31143d5d DH |
88 | int ret; |
89 | ||
3b6492df | 90 | _enter("{%llx:%llu},{%lx},%u,%u", |
15b4650e | 91 | vnode->fid.vid, vnode->fid.vnode, index, from, to); |
31143d5d | 92 | |
4343d008 DH |
93 | /* We want to store information about how much of a page is altered in |
94 | * page->private. | |
95 | */ | |
96 | BUILD_BUG_ON(PAGE_SIZE > 32768 && sizeof(page->private) < 8); | |
31143d5d | 97 | |
54566b2c | 98 | page = grab_cache_page_write_begin(mapping, index, flags); |
4343d008 | 99 | if (!page) |
15b4650e | 100 | return -ENOMEM; |
15b4650e | 101 | |
09cbfeaf | 102 | if (!PageUptodate(page) && len != PAGE_SIZE) { |
e8e581a8 | 103 | ret = afs_fill_page(vnode, key, pos & PAGE_MASK, PAGE_SIZE, page); |
31143d5d | 104 | if (ret < 0) { |
6d06b0d2 DH |
105 | unlock_page(page); |
106 | put_page(page); | |
31143d5d DH |
107 | _leave(" = %d [prep]", ret); |
108 | return ret; | |
109 | } | |
15b4650e | 110 | SetPageUptodate(page); |
31143d5d DH |
111 | } |
112 | ||
6d06b0d2 DH |
113 | /* page won't leak in error case: it eventually gets cleaned off LRU */ |
114 | *pagep = page; | |
115 | ||
31143d5d | 116 | try_again: |
4343d008 DH |
117 | /* See if this page is already partially written in a way that we can |
118 | * merge the new write with. | |
119 | */ | |
120 | t = f = 0; | |
121 | if (PagePrivate(page)) { | |
122 | priv = page_private(page); | |
123 | f = priv & AFS_PRIV_MAX; | |
124 | t = priv >> AFS_PRIV_SHIFT; | |
125 | ASSERTCMP(f, <=, t); | |
31143d5d DH |
126 | } |
127 | ||
4343d008 | 128 | if (f != t) { |
5a039c32 DH |
129 | if (PageWriteback(page)) { |
130 | trace_afs_page_dirty(vnode, tracepoint_string("alrdy"), | |
131 | page->index, priv); | |
132 | goto flush_conflicting_write; | |
133 | } | |
5a813276 DH |
134 | /* If the file is being filled locally, allow inter-write |
135 | * spaces to be merged into writes. If it's not, only write | |
136 | * back what the user gives us. | |
137 | */ | |
138 | if (!test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags) && | |
139 | (to < f || from > t)) | |
4343d008 DH |
140 | goto flush_conflicting_write; |
141 | if (from < f) | |
142 | f = from; | |
143 | if (to > t) | |
144 | t = to; | |
145 | } else { | |
146 | f = from; | |
147 | t = to; | |
31143d5d DH |
148 | } |
149 | ||
4343d008 DH |
150 | priv = (unsigned long)t << AFS_PRIV_SHIFT; |
151 | priv |= f; | |
13524ab3 DH |
152 | trace_afs_page_dirty(vnode, tracepoint_string("begin"), |
153 | page->index, priv); | |
31143d5d | 154 | SetPagePrivate(page); |
4343d008 DH |
155 | set_page_private(page, priv); |
156 | _leave(" = 0"); | |
31143d5d DH |
157 | return 0; |
158 | ||
4343d008 DH |
159 | /* The previous write and this write aren't adjacent or overlapping, so |
160 | * flush the page out. | |
161 | */ | |
162 | flush_conflicting_write: | |
31143d5d | 163 | _debug("flush conflict"); |
4343d008 DH |
164 | ret = write_one_page(page); |
165 | if (ret < 0) { | |
166 | _leave(" = %d", ret); | |
167 | return ret; | |
31143d5d DH |
168 | } |
169 | ||
4343d008 DH |
170 | ret = lock_page_killable(page); |
171 | if (ret < 0) { | |
172 | _leave(" = %d", ret); | |
173 | return ret; | |
174 | } | |
31143d5d DH |
175 | goto try_again; |
176 | } | |
177 | ||
178 | /* | |
179 | * finalise part of a write to a page | |
180 | */ | |
15b4650e NP |
181 | int afs_write_end(struct file *file, struct address_space *mapping, |
182 | loff_t pos, unsigned len, unsigned copied, | |
183 | struct page *page, void *fsdata) | |
31143d5d | 184 | { |
496ad9aa | 185 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); |
215804a9 | 186 | struct key *key = afs_file_key(file); |
31143d5d | 187 | loff_t i_size, maybe_i_size; |
e8e581a8 | 188 | int ret; |
31143d5d | 189 | |
3b6492df | 190 | _enter("{%llx:%llu},{%lx}", |
15b4650e | 191 | vnode->fid.vid, vnode->fid.vnode, page->index); |
31143d5d | 192 | |
15b4650e | 193 | maybe_i_size = pos + copied; |
31143d5d DH |
194 | |
195 | i_size = i_size_read(&vnode->vfs_inode); | |
196 | if (maybe_i_size > i_size) { | |
1f32ef79 | 197 | write_seqlock(&vnode->cb_lock); |
31143d5d DH |
198 | i_size = i_size_read(&vnode->vfs_inode); |
199 | if (maybe_i_size > i_size) | |
200 | i_size_write(&vnode->vfs_inode, maybe_i_size); | |
1f32ef79 | 201 | write_sequnlock(&vnode->cb_lock); |
31143d5d DH |
202 | } |
203 | ||
e8e581a8 DH |
204 | if (!PageUptodate(page)) { |
205 | if (copied < len) { | |
206 | /* Try and load any missing data from the server. The | |
207 | * unmarshalling routine will take care of clearing any | |
208 | * bits that are beyond the EOF. | |
209 | */ | |
210 | ret = afs_fill_page(vnode, key, pos + copied, | |
211 | len - copied, page); | |
212 | if (ret < 0) | |
afae457d | 213 | goto out; |
e8e581a8 DH |
214 | } |
215 | SetPageUptodate(page); | |
216 | } | |
217 | ||
31143d5d | 218 | set_page_dirty(page); |
31143d5d DH |
219 | if (PageDirty(page)) |
220 | _debug("dirtied"); | |
afae457d DH |
221 | ret = copied; |
222 | ||
223 | out: | |
15b4650e | 224 | unlock_page(page); |
09cbfeaf | 225 | put_page(page); |
afae457d | 226 | return ret; |
31143d5d DH |
227 | } |
228 | ||
229 | /* | |
230 | * kill all the pages in the given range | |
231 | */ | |
4343d008 | 232 | static void afs_kill_pages(struct address_space *mapping, |
31143d5d DH |
233 | pgoff_t first, pgoff_t last) |
234 | { | |
4343d008 | 235 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
31143d5d DH |
236 | struct pagevec pv; |
237 | unsigned count, loop; | |
238 | ||
3b6492df | 239 | _enter("{%llx:%llu},%lx-%lx", |
31143d5d DH |
240 | vnode->fid.vid, vnode->fid.vnode, first, last); |
241 | ||
86679820 | 242 | pagevec_init(&pv); |
31143d5d DH |
243 | |
244 | do { | |
245 | _debug("kill %lx-%lx", first, last); | |
246 | ||
247 | count = last - first + 1; | |
248 | if (count > PAGEVEC_SIZE) | |
249 | count = PAGEVEC_SIZE; | |
4343d008 | 250 | pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); |
31143d5d DH |
251 | ASSERTCMP(pv.nr, ==, count); |
252 | ||
253 | for (loop = 0; loop < count; loop++) { | |
7286a35e DH |
254 | struct page *page = pv.pages[loop]; |
255 | ClearPageUptodate(page); | |
4343d008 DH |
256 | SetPageError(page); |
257 | end_page_writeback(page); | |
7286a35e DH |
258 | if (page->index >= first) |
259 | first = page->index + 1; | |
4343d008 DH |
260 | lock_page(page); |
261 | generic_error_remove_page(mapping, page); | |
21bd68f1 | 262 | unlock_page(page); |
31143d5d DH |
263 | } |
264 | ||
265 | __pagevec_release(&pv); | |
4343d008 | 266 | } while (first <= last); |
31143d5d DH |
267 | |
268 | _leave(""); | |
269 | } | |
270 | ||
271 | /* | |
4343d008 DH |
272 | * Redirty all the pages in a given range. |
273 | */ | |
274 | static void afs_redirty_pages(struct writeback_control *wbc, | |
275 | struct address_space *mapping, | |
276 | pgoff_t first, pgoff_t last) | |
277 | { | |
278 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); | |
279 | struct pagevec pv; | |
280 | unsigned count, loop; | |
281 | ||
3b6492df | 282 | _enter("{%llx:%llu},%lx-%lx", |
4343d008 DH |
283 | vnode->fid.vid, vnode->fid.vnode, first, last); |
284 | ||
487e2c9f | 285 | pagevec_init(&pv); |
4343d008 DH |
286 | |
287 | do { | |
288 | _debug("redirty %lx-%lx", first, last); | |
289 | ||
290 | count = last - first + 1; | |
291 | if (count > PAGEVEC_SIZE) | |
292 | count = PAGEVEC_SIZE; | |
293 | pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); | |
294 | ASSERTCMP(pv.nr, ==, count); | |
295 | ||
296 | for (loop = 0; loop < count; loop++) { | |
297 | struct page *page = pv.pages[loop]; | |
298 | ||
299 | redirty_page_for_writepage(wbc, page); | |
300 | end_page_writeback(page); | |
301 | if (page->index >= first) | |
302 | first = page->index + 1; | |
303 | } | |
304 | ||
305 | __pagevec_release(&pv); | |
306 | } while (first <= last); | |
31143d5d DH |
307 | |
308 | _leave(""); | |
309 | } | |
310 | ||
a58823ac DH |
311 | /* |
312 | * completion of write to server | |
313 | */ | |
314 | static void afs_pages_written_back(struct afs_vnode *vnode, | |
315 | pgoff_t first, pgoff_t last) | |
316 | { | |
317 | struct pagevec pv; | |
318 | unsigned long priv; | |
319 | unsigned count, loop; | |
320 | ||
321 | _enter("{%llx:%llu},{%lx-%lx}", | |
322 | vnode->fid.vid, vnode->fid.vnode, first, last); | |
323 | ||
324 | pagevec_init(&pv); | |
325 | ||
326 | do { | |
327 | _debug("done %lx-%lx", first, last); | |
328 | ||
329 | count = last - first + 1; | |
330 | if (count > PAGEVEC_SIZE) | |
331 | count = PAGEVEC_SIZE; | |
332 | pv.nr = find_get_pages_contig(vnode->vfs_inode.i_mapping, | |
333 | first, count, pv.pages); | |
334 | ASSERTCMP(pv.nr, ==, count); | |
335 | ||
336 | for (loop = 0; loop < count; loop++) { | |
337 | priv = page_private(pv.pages[loop]); | |
338 | trace_afs_page_dirty(vnode, tracepoint_string("clear"), | |
339 | pv.pages[loop]->index, priv); | |
340 | set_page_private(pv.pages[loop], 0); | |
341 | end_page_writeback(pv.pages[loop]); | |
342 | } | |
343 | first += count; | |
344 | __pagevec_release(&pv); | |
345 | } while (first <= last); | |
346 | ||
347 | afs_prune_wb_keys(vnode); | |
348 | _leave(""); | |
349 | } | |
350 | ||
d2ddc776 | 351 | /* |
e49c7b2f DH |
352 | * Find a key to use for the writeback. We cached the keys used to author the |
353 | * writes on the vnode. *_wbk will contain the last writeback key used or NULL | |
354 | * and we need to start from there if it's set. | |
d2ddc776 | 355 | */ |
e49c7b2f DH |
356 | static int afs_get_writeback_key(struct afs_vnode *vnode, |
357 | struct afs_wb_key **_wbk) | |
d2ddc776 | 358 | { |
4343d008 DH |
359 | struct afs_wb_key *wbk = NULL; |
360 | struct list_head *p; | |
361 | int ret = -ENOKEY, ret2; | |
d2ddc776 | 362 | |
4343d008 | 363 | spin_lock(&vnode->wb_lock); |
e49c7b2f DH |
364 | if (*_wbk) |
365 | p = (*_wbk)->vnode_link.next; | |
366 | else | |
367 | p = vnode->wb_keys.next; | |
4343d008 | 368 | |
4343d008 DH |
369 | while (p != &vnode->wb_keys) { |
370 | wbk = list_entry(p, struct afs_wb_key, vnode_link); | |
371 | _debug("wbk %u", key_serial(wbk->key)); | |
372 | ret2 = key_validate(wbk->key); | |
e49c7b2f DH |
373 | if (ret2 == 0) { |
374 | refcount_inc(&wbk->usage); | |
375 | _debug("USE WB KEY %u", key_serial(wbk->key)); | |
376 | break; | |
377 | } | |
378 | ||
379 | wbk = NULL; | |
4343d008 DH |
380 | if (ret == -ENOKEY) |
381 | ret = ret2; | |
382 | p = p->next; | |
383 | } | |
384 | ||
385 | spin_unlock(&vnode->wb_lock); | |
e49c7b2f DH |
386 | if (*_wbk) |
387 | afs_put_wb_key(*_wbk); | |
388 | *_wbk = wbk; | |
389 | return 0; | |
390 | } | |
4343d008 | 391 | |
e49c7b2f DH |
392 | static void afs_store_data_success(struct afs_operation *op) |
393 | { | |
394 | struct afs_vnode *vnode = op->file[0].vnode; | |
4343d008 | 395 | |
da8d0755 | 396 | op->ctime = op->file[0].scb.status.mtime_client; |
e49c7b2f DH |
397 | afs_vnode_commit_status(op, &op->file[0]); |
398 | if (op->error == 0) { | |
399 | afs_pages_written_back(vnode, op->store.first, op->store.last); | |
400 | afs_stat_v(vnode, n_stores); | |
401 | atomic_long_add((op->store.last * PAGE_SIZE + op->store.last_to) - | |
402 | (op->store.first * PAGE_SIZE + op->store.first_offset), | |
403 | &afs_v2net(vnode)->n_store_bytes); | |
404 | } | |
405 | } | |
4343d008 | 406 | |
e49c7b2f DH |
407 | static const struct afs_operation_ops afs_store_data_operation = { |
408 | .issue_afs_rpc = afs_fs_store_data, | |
409 | .issue_yfs_rpc = yfs_fs_store_data, | |
410 | .success = afs_store_data_success, | |
411 | }; | |
a58823ac | 412 | |
e49c7b2f DH |
413 | /* |
414 | * write to a file | |
415 | */ | |
416 | static int afs_store_data(struct address_space *mapping, | |
417 | pgoff_t first, pgoff_t last, | |
418 | unsigned offset, unsigned to) | |
419 | { | |
420 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); | |
421 | struct afs_operation *op; | |
422 | struct afs_wb_key *wbk = NULL; | |
423 | int ret; | |
424 | ||
425 | _enter("%s{%llx:%llu.%u},%lx,%lx,%x,%x", | |
426 | vnode->volume->name, | |
427 | vnode->fid.vid, | |
428 | vnode->fid.vnode, | |
429 | vnode->fid.unique, | |
430 | first, last, offset, to); | |
d2ddc776 | 431 | |
e49c7b2f DH |
432 | ret = afs_get_writeback_key(vnode, &wbk); |
433 | if (ret) { | |
434 | _leave(" = %d [no keys]", ret); | |
435 | return ret; | |
d2ddc776 DH |
436 | } |
437 | ||
e49c7b2f DH |
438 | op = afs_alloc_operation(wbk->key, vnode->volume); |
439 | if (IS_ERR(op)) { | |
440 | afs_put_wb_key(wbk); | |
441 | return -ENOMEM; | |
442 | } | |
443 | ||
444 | afs_op_set_vnode(op, 0, vnode); | |
445 | op->file[0].dv_delta = 1; | |
446 | op->store.mapping = mapping; | |
447 | op->store.first = first; | |
448 | op->store.last = last; | |
449 | op->store.first_offset = offset; | |
450 | op->store.last_to = to; | |
b3597945 | 451 | op->mtime = vnode->vfs_inode.i_mtime; |
811f04ba | 452 | op->flags |= AFS_OPERATION_UNINTR; |
e49c7b2f DH |
453 | op->ops = &afs_store_data_operation; |
454 | ||
455 | try_next_key: | |
456 | afs_begin_vnode_operation(op); | |
457 | afs_wait_for_operation(op); | |
458 | ||
459 | switch (op->error) { | |
4343d008 DH |
460 | case -EACCES: |
461 | case -EPERM: | |
462 | case -ENOKEY: | |
463 | case -EKEYEXPIRED: | |
464 | case -EKEYREJECTED: | |
465 | case -EKEYREVOKED: | |
466 | _debug("next"); | |
e49c7b2f DH |
467 | |
468 | ret = afs_get_writeback_key(vnode, &wbk); | |
469 | if (ret == 0) { | |
470 | key_put(op->key); | |
471 | op->key = key_get(wbk->key); | |
472 | goto try_next_key; | |
473 | } | |
474 | break; | |
4343d008 DH |
475 | } |
476 | ||
477 | afs_put_wb_key(wbk); | |
e49c7b2f DH |
478 | _leave(" = %d", op->error); |
479 | return afs_put_operation(op); | |
d2ddc776 DH |
480 | } |
481 | ||
31143d5d | 482 | /* |
4343d008 DH |
483 | * Synchronously write back the locked page and any subsequent non-locked dirty |
484 | * pages. | |
31143d5d | 485 | */ |
4343d008 DH |
486 | static int afs_write_back_from_locked_page(struct address_space *mapping, |
487 | struct writeback_control *wbc, | |
488 | struct page *primary_page, | |
489 | pgoff_t final_page) | |
31143d5d | 490 | { |
13524ab3 | 491 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
31143d5d | 492 | struct page *pages[8], *page; |
4343d008 DH |
493 | unsigned long count, priv; |
494 | unsigned n, offset, to, f, t; | |
31143d5d | 495 | pgoff_t start, first, last; |
793fe82e | 496 | loff_t i_size, end; |
31143d5d DH |
497 | int loop, ret; |
498 | ||
499 | _enter(",%lx", primary_page->index); | |
500 | ||
501 | count = 1; | |
31143d5d DH |
502 | if (test_set_page_writeback(primary_page)) |
503 | BUG(); | |
504 | ||
4343d008 DH |
505 | /* Find all consecutive lockable dirty pages that have contiguous |
506 | * written regions, stopping when we find a page that is not | |
507 | * immediately lockable, is not dirty or is missing, or we reach the | |
508 | * end of the range. | |
509 | */ | |
31143d5d | 510 | start = primary_page->index; |
4343d008 DH |
511 | priv = page_private(primary_page); |
512 | offset = priv & AFS_PRIV_MAX; | |
513 | to = priv >> AFS_PRIV_SHIFT; | |
13524ab3 DH |
514 | trace_afs_page_dirty(vnode, tracepoint_string("store"), |
515 | primary_page->index, priv); | |
4343d008 DH |
516 | |
517 | WARN_ON(offset == to); | |
13524ab3 DH |
518 | if (offset == to) |
519 | trace_afs_page_dirty(vnode, tracepoint_string("WARN"), | |
520 | primary_page->index, priv); | |
4343d008 | 521 | |
5a813276 DH |
522 | if (start >= final_page || |
523 | (to < PAGE_SIZE && !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags))) | |
31143d5d | 524 | goto no_more; |
4343d008 | 525 | |
31143d5d DH |
526 | start++; |
527 | do { | |
528 | _debug("more %lx [%lx]", start, count); | |
4343d008 | 529 | n = final_page - start + 1; |
31143d5d DH |
530 | if (n > ARRAY_SIZE(pages)) |
531 | n = ARRAY_SIZE(pages); | |
4343d008 | 532 | n = find_get_pages_contig(mapping, start, ARRAY_SIZE(pages), pages); |
31143d5d DH |
533 | _debug("fgpc %u", n); |
534 | if (n == 0) | |
535 | goto no_more; | |
536 | if (pages[0]->index != start) { | |
9d577b6a DH |
537 | do { |
538 | put_page(pages[--n]); | |
539 | } while (n > 0); | |
31143d5d DH |
540 | goto no_more; |
541 | } | |
542 | ||
543 | for (loop = 0; loop < n; loop++) { | |
544 | page = pages[loop]; | |
5a813276 DH |
545 | if (to != PAGE_SIZE && |
546 | !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) | |
547 | break; | |
4343d008 | 548 | if (page->index > final_page) |
31143d5d | 549 | break; |
529ae9aa | 550 | if (!trylock_page(page)) |
31143d5d | 551 | break; |
4343d008 | 552 | if (!PageDirty(page) || PageWriteback(page)) { |
31143d5d DH |
553 | unlock_page(page); |
554 | break; | |
555 | } | |
4343d008 DH |
556 | |
557 | priv = page_private(page); | |
558 | f = priv & AFS_PRIV_MAX; | |
559 | t = priv >> AFS_PRIV_SHIFT; | |
5a813276 DH |
560 | if (f != 0 && |
561 | !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) { | |
31143d5d DH |
562 | unlock_page(page); |
563 | break; | |
564 | } | |
4343d008 DH |
565 | to = t; |
566 | ||
13524ab3 DH |
567 | trace_afs_page_dirty(vnode, tracepoint_string("store+"), |
568 | page->index, priv); | |
569 | ||
31143d5d DH |
570 | if (!clear_page_dirty_for_io(page)) |
571 | BUG(); | |
572 | if (test_set_page_writeback(page)) | |
573 | BUG(); | |
574 | unlock_page(page); | |
575 | put_page(page); | |
576 | } | |
577 | count += loop; | |
578 | if (loop < n) { | |
579 | for (; loop < n; loop++) | |
580 | put_page(pages[loop]); | |
581 | goto no_more; | |
582 | } | |
583 | ||
584 | start += loop; | |
4343d008 | 585 | } while (start <= final_page && count < 65536); |
31143d5d DH |
586 | |
587 | no_more: | |
4343d008 DH |
588 | /* We now have a contiguous set of dirty pages, each with writeback |
589 | * set; the first page is still locked at this point, but all the rest | |
590 | * have been unlocked. | |
591 | */ | |
592 | unlock_page(primary_page); | |
593 | ||
31143d5d DH |
594 | first = primary_page->index; |
595 | last = first + count - 1; | |
596 | ||
793fe82e DH |
597 | end = (loff_t)last * PAGE_SIZE + to; |
598 | i_size = i_size_read(&vnode->vfs_inode); | |
599 | ||
31143d5d | 600 | _debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to); |
793fe82e DH |
601 | if (end > i_size) |
602 | to = i_size & ~PAGE_MASK; | |
31143d5d | 603 | |
4343d008 DH |
604 | ret = afs_store_data(mapping, first, last, offset, to); |
605 | switch (ret) { | |
606 | case 0: | |
31143d5d | 607 | ret = count; |
4343d008 DH |
608 | break; |
609 | ||
610 | default: | |
611 | pr_notice("kAFS: Unexpected error from FS.StoreData %d\n", ret); | |
df561f66 | 612 | fallthrough; |
4343d008 DH |
613 | case -EACCES: |
614 | case -EPERM: | |
615 | case -ENOKEY: | |
616 | case -EKEYEXPIRED: | |
617 | case -EKEYREJECTED: | |
618 | case -EKEYREVOKED: | |
619 | afs_redirty_pages(wbc, mapping, first, last); | |
620 | mapping_set_error(mapping, ret); | |
621 | break; | |
622 | ||
623 | case -EDQUOT: | |
624 | case -ENOSPC: | |
625 | afs_redirty_pages(wbc, mapping, first, last); | |
626 | mapping_set_error(mapping, -ENOSPC); | |
627 | break; | |
628 | ||
629 | case -EROFS: | |
630 | case -EIO: | |
631 | case -EREMOTEIO: | |
632 | case -EFBIG: | |
633 | case -ENOENT: | |
634 | case -ENOMEDIUM: | |
635 | case -ENXIO: | |
f51375cd | 636 | trace_afs_file_error(vnode, ret, afs_file_error_writeback_fail); |
4343d008 DH |
637 | afs_kill_pages(mapping, first, last); |
638 | mapping_set_error(mapping, ret); | |
639 | break; | |
31143d5d DH |
640 | } |
641 | ||
642 | _leave(" = %d", ret); | |
643 | return ret; | |
644 | } | |
645 | ||
646 | /* | |
647 | * write a page back to the server | |
648 | * - the caller locked the page for us | |
649 | */ | |
650 | int afs_writepage(struct page *page, struct writeback_control *wbc) | |
651 | { | |
31143d5d DH |
652 | int ret; |
653 | ||
654 | _enter("{%lx},", page->index); | |
655 | ||
4343d008 DH |
656 | ret = afs_write_back_from_locked_page(page->mapping, wbc, page, |
657 | wbc->range_end >> PAGE_SHIFT); | |
31143d5d DH |
658 | if (ret < 0) { |
659 | _leave(" = %d", ret); | |
660 | return 0; | |
661 | } | |
662 | ||
663 | wbc->nr_to_write -= ret; | |
31143d5d DH |
664 | |
665 | _leave(" = 0"); | |
666 | return 0; | |
667 | } | |
668 | ||
669 | /* | |
670 | * write a region of pages back to the server | |
671 | */ | |
c1206a2c AB |
672 | static int afs_writepages_region(struct address_space *mapping, |
673 | struct writeback_control *wbc, | |
674 | pgoff_t index, pgoff_t end, pgoff_t *_next) | |
31143d5d | 675 | { |
31143d5d DH |
676 | struct page *page; |
677 | int ret, n; | |
678 | ||
679 | _enter(",,%lx,%lx,", index, end); | |
680 | ||
681 | do { | |
aef6e415 JK |
682 | n = find_get_pages_range_tag(mapping, &index, end, |
683 | PAGECACHE_TAG_DIRTY, 1, &page); | |
31143d5d DH |
684 | if (!n) |
685 | break; | |
686 | ||
687 | _debug("wback %lx", page->index); | |
688 | ||
b93b0163 MW |
689 | /* |
690 | * at this point we hold neither the i_pages lock nor the | |
691 | * page lock: the page may be truncated or invalidated | |
692 | * (changing page->mapping to NULL), or even swizzled | |
693 | * back from swapper_space to tmpfs file mapping | |
31143d5d | 694 | */ |
4343d008 DH |
695 | ret = lock_page_killable(page); |
696 | if (ret < 0) { | |
697 | put_page(page); | |
698 | _leave(" = %d", ret); | |
699 | return ret; | |
700 | } | |
31143d5d | 701 | |
c5051c7b | 702 | if (page->mapping != mapping || !PageDirty(page)) { |
31143d5d | 703 | unlock_page(page); |
09cbfeaf | 704 | put_page(page); |
31143d5d DH |
705 | continue; |
706 | } | |
707 | ||
c5051c7b | 708 | if (PageWriteback(page)) { |
31143d5d | 709 | unlock_page(page); |
c5051c7b DH |
710 | if (wbc->sync_mode != WB_SYNC_NONE) |
711 | wait_on_page_writeback(page); | |
29c8bbbd | 712 | put_page(page); |
31143d5d DH |
713 | continue; |
714 | } | |
715 | ||
65a15109 DH |
716 | if (!clear_page_dirty_for_io(page)) |
717 | BUG(); | |
4343d008 | 718 | ret = afs_write_back_from_locked_page(mapping, wbc, page, end); |
09cbfeaf | 719 | put_page(page); |
31143d5d DH |
720 | if (ret < 0) { |
721 | _leave(" = %d", ret); | |
722 | return ret; | |
723 | } | |
724 | ||
725 | wbc->nr_to_write -= ret; | |
726 | ||
31143d5d DH |
727 | cond_resched(); |
728 | } while (index < end && wbc->nr_to_write > 0); | |
729 | ||
730 | *_next = index; | |
731 | _leave(" = 0 [%lx]", *_next); | |
732 | return 0; | |
733 | } | |
734 | ||
735 | /* | |
736 | * write some of the pending data back to the server | |
737 | */ | |
738 | int afs_writepages(struct address_space *mapping, | |
739 | struct writeback_control *wbc) | |
740 | { | |
31143d5d DH |
741 | pgoff_t start, end, next; |
742 | int ret; | |
743 | ||
744 | _enter(""); | |
745 | ||
31143d5d DH |
746 | if (wbc->range_cyclic) { |
747 | start = mapping->writeback_index; | |
748 | end = -1; | |
749 | ret = afs_writepages_region(mapping, wbc, start, end, &next); | |
1b430bee | 750 | if (start > 0 && wbc->nr_to_write > 0 && ret == 0) |
31143d5d DH |
751 | ret = afs_writepages_region(mapping, wbc, 0, start, |
752 | &next); | |
753 | mapping->writeback_index = next; | |
754 | } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) { | |
09cbfeaf | 755 | end = (pgoff_t)(LLONG_MAX >> PAGE_SHIFT); |
31143d5d DH |
756 | ret = afs_writepages_region(mapping, wbc, 0, end, &next); |
757 | if (wbc->nr_to_write > 0) | |
758 | mapping->writeback_index = next; | |
759 | } else { | |
09cbfeaf KS |
760 | start = wbc->range_start >> PAGE_SHIFT; |
761 | end = wbc->range_end >> PAGE_SHIFT; | |
31143d5d DH |
762 | ret = afs_writepages_region(mapping, wbc, start, end, &next); |
763 | } | |
764 | ||
765 | _leave(" = %d", ret); | |
766 | return ret; | |
767 | } | |
768 | ||
31143d5d DH |
769 | /* |
770 | * write to an AFS file | |
771 | */ | |
50b5551d | 772 | ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) |
31143d5d | 773 | { |
496ad9aa | 774 | struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); |
31143d5d | 775 | ssize_t result; |
50b5551d | 776 | size_t count = iov_iter_count(from); |
31143d5d | 777 | |
3b6492df | 778 | _enter("{%llx:%llu},{%zu},", |
50b5551d | 779 | vnode->fid.vid, vnode->fid.vnode, count); |
31143d5d DH |
780 | |
781 | if (IS_SWAPFILE(&vnode->vfs_inode)) { | |
782 | printk(KERN_INFO | |
783 | "AFS: Attempt to write to active swap file!\n"); | |
784 | return -EBUSY; | |
785 | } | |
786 | ||
787 | if (!count) | |
788 | return 0; | |
789 | ||
50b5551d | 790 | result = generic_file_write_iter(iocb, from); |
31143d5d | 791 | |
31143d5d DH |
792 | _leave(" = %zd", result); |
793 | return result; | |
794 | } | |
795 | ||
31143d5d DH |
796 | /* |
797 | * flush any dirty pages for this process, and check for write errors. | |
798 | * - the return status from this call provides a reliable indication of | |
799 | * whether any write errors occurred for this process. | |
800 | */ | |
02c24a82 | 801 | int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
31143d5d | 802 | { |
3c981bfc | 803 | struct inode *inode = file_inode(file); |
3c981bfc | 804 | struct afs_vnode *vnode = AFS_FS_I(inode); |
31143d5d | 805 | |
3b6492df | 806 | _enter("{%llx:%llu},{n=%pD},%d", |
3c981bfc | 807 | vnode->fid.vid, vnode->fid.vnode, file, |
31143d5d DH |
808 | datasync); |
809 | ||
4343d008 | 810 | return file_write_and_wait_range(file, start, end); |
31143d5d | 811 | } |
9b3f26c9 DH |
812 | |
813 | /* | |
814 | * notification that a previously read-only page is about to become writable | |
815 | * - if it returns an error, the caller will deliver a bus error signal | |
816 | */ | |
0722f186 | 817 | vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) |
9b3f26c9 | 818 | { |
1cf7a151 DH |
819 | struct file *file = vmf->vma->vm_file; |
820 | struct inode *inode = file_inode(file); | |
821 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
822 | unsigned long priv; | |
9b3f26c9 | 823 | |
3b6492df | 824 | _enter("{{%llx:%llu}},{%lx}", |
1cf7a151 | 825 | vnode->fid.vid, vnode->fid.vnode, vmf->page->index); |
9b3f26c9 | 826 | |
1cf7a151 | 827 | sb_start_pagefault(inode->i_sb); |
9b3f26c9 | 828 | |
1cf7a151 DH |
829 | /* Wait for the page to be written to the cache before we allow it to |
830 | * be modified. We then assume the entire page will need writing back. | |
831 | */ | |
9b3f26c9 | 832 | #ifdef CONFIG_AFS_FSCACHE |
1cf7a151 | 833 | fscache_wait_on_page_write(vnode->cache, vmf->page); |
9b3f26c9 DH |
834 | #endif |
835 | ||
1cf7a151 DH |
836 | if (PageWriteback(vmf->page) && |
837 | wait_on_page_bit_killable(vmf->page, PG_writeback) < 0) | |
838 | return VM_FAULT_RETRY; | |
839 | ||
840 | if (lock_page_killable(vmf->page) < 0) | |
841 | return VM_FAULT_RETRY; | |
842 | ||
843 | /* We mustn't change page->private until writeback is complete as that | |
844 | * details the portion of the page we need to write back and we might | |
845 | * need to redirty the page if there's a problem. | |
846 | */ | |
847 | wait_on_page_writeback(vmf->page); | |
848 | ||
849 | priv = (unsigned long)PAGE_SIZE << AFS_PRIV_SHIFT; /* To */ | |
850 | priv |= 0; /* From */ | |
13524ab3 DH |
851 | trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"), |
852 | vmf->page->index, priv); | |
1cf7a151 DH |
853 | SetPagePrivate(vmf->page); |
854 | set_page_private(vmf->page, priv); | |
bb413489 | 855 | file_update_time(file); |
1cf7a151 DH |
856 | |
857 | sb_end_pagefault(inode->i_sb); | |
858 | return VM_FAULT_LOCKED; | |
9b3f26c9 | 859 | } |
4343d008 DH |
860 | |
861 | /* | |
862 | * Prune the keys cached for writeback. The caller must hold vnode->wb_lock. | |
863 | */ | |
864 | void afs_prune_wb_keys(struct afs_vnode *vnode) | |
865 | { | |
866 | LIST_HEAD(graveyard); | |
867 | struct afs_wb_key *wbk, *tmp; | |
868 | ||
869 | /* Discard unused keys */ | |
870 | spin_lock(&vnode->wb_lock); | |
871 | ||
872 | if (!mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_WRITEBACK) && | |
873 | !mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_DIRTY)) { | |
874 | list_for_each_entry_safe(wbk, tmp, &vnode->wb_keys, vnode_link) { | |
875 | if (refcount_read(&wbk->usage) == 1) | |
876 | list_move(&wbk->vnode_link, &graveyard); | |
877 | } | |
878 | } | |
879 | ||
880 | spin_unlock(&vnode->wb_lock); | |
881 | ||
882 | while (!list_empty(&graveyard)) { | |
883 | wbk = list_entry(graveyard.next, struct afs_wb_key, vnode_link); | |
884 | list_del(&wbk->vnode_link); | |
885 | afs_put_wb_key(wbk); | |
886 | } | |
887 | } | |
888 | ||
889 | /* | |
890 | * Clean up a page during invalidation. | |
891 | */ | |
892 | int afs_launder_page(struct page *page) | |
893 | { | |
894 | struct address_space *mapping = page->mapping; | |
895 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); | |
896 | unsigned long priv; | |
897 | unsigned int f, t; | |
898 | int ret = 0; | |
899 | ||
900 | _enter("{%lx}", page->index); | |
901 | ||
902 | priv = page_private(page); | |
903 | if (clear_page_dirty_for_io(page)) { | |
904 | f = 0; | |
905 | t = PAGE_SIZE; | |
906 | if (PagePrivate(page)) { | |
907 | f = priv & AFS_PRIV_MAX; | |
908 | t = priv >> AFS_PRIV_SHIFT; | |
909 | } | |
910 | ||
13524ab3 DH |
911 | trace_afs_page_dirty(vnode, tracepoint_string("launder"), |
912 | page->index, priv); | |
4343d008 DH |
913 | ret = afs_store_data(mapping, page->index, page->index, t, f); |
914 | } | |
915 | ||
13524ab3 DH |
916 | trace_afs_page_dirty(vnode, tracepoint_string("laundered"), |
917 | page->index, priv); | |
4343d008 DH |
918 | set_page_private(page, 0); |
919 | ClearPagePrivate(page); | |
920 | ||
921 | #ifdef CONFIG_AFS_FSCACHE | |
922 | if (PageFsCache(page)) { | |
923 | fscache_wait_on_page_write(vnode->cache, page); | |
924 | fscache_uncache_page(vnode->cache, page); | |
925 | } | |
926 | #endif | |
927 | return ret; | |
9b3f26c9 | 928 | } |