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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, | |
21db2cdc | 79 | struct page **_page, 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 | |
54566b2c | 93 | page = grab_cache_page_write_begin(mapping, index, flags); |
4343d008 | 94 | if (!page) |
15b4650e | 95 | return -ENOMEM; |
15b4650e | 96 | |
09cbfeaf | 97 | if (!PageUptodate(page) && len != PAGE_SIZE) { |
e8e581a8 | 98 | ret = afs_fill_page(vnode, key, pos & PAGE_MASK, PAGE_SIZE, page); |
31143d5d | 99 | if (ret < 0) { |
6d06b0d2 DH |
100 | unlock_page(page); |
101 | put_page(page); | |
31143d5d DH |
102 | _leave(" = %d [prep]", ret); |
103 | return ret; | |
104 | } | |
15b4650e | 105 | SetPageUptodate(page); |
31143d5d DH |
106 | } |
107 | ||
108 | try_again: | |
4343d008 DH |
109 | /* See if this page is already partially written in a way that we can |
110 | * merge the new write with. | |
111 | */ | |
112 | t = f = 0; | |
113 | if (PagePrivate(page)) { | |
114 | priv = page_private(page); | |
185f0c70 DH |
115 | f = afs_page_dirty_from(priv); |
116 | t = afs_page_dirty_to(priv); | |
4343d008 | 117 | ASSERTCMP(f, <=, t); |
31143d5d DH |
118 | } |
119 | ||
4343d008 | 120 | if (f != t) { |
5a039c32 DH |
121 | if (PageWriteback(page)) { |
122 | trace_afs_page_dirty(vnode, tracepoint_string("alrdy"), | |
123 | page->index, priv); | |
124 | goto flush_conflicting_write; | |
125 | } | |
5a813276 DH |
126 | /* If the file is being filled locally, allow inter-write |
127 | * spaces to be merged into writes. If it's not, only write | |
128 | * back what the user gives us. | |
129 | */ | |
130 | if (!test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags) && | |
131 | (to < f || from > t)) | |
4343d008 | 132 | goto flush_conflicting_write; |
31143d5d DH |
133 | } |
134 | ||
21db2cdc | 135 | *_page = page; |
4343d008 | 136 | _leave(" = 0"); |
31143d5d DH |
137 | return 0; |
138 | ||
4343d008 DH |
139 | /* The previous write and this write aren't adjacent or overlapping, so |
140 | * flush the page out. | |
141 | */ | |
142 | flush_conflicting_write: | |
31143d5d | 143 | _debug("flush conflict"); |
4343d008 | 144 | ret = write_one_page(page); |
21db2cdc DH |
145 | if (ret < 0) |
146 | goto error; | |
31143d5d | 147 | |
4343d008 | 148 | ret = lock_page_killable(page); |
21db2cdc DH |
149 | if (ret < 0) |
150 | goto error; | |
31143d5d | 151 | goto try_again; |
21db2cdc DH |
152 | |
153 | error: | |
154 | put_page(page); | |
155 | _leave(" = %d", ret); | |
156 | return ret; | |
31143d5d DH |
157 | } |
158 | ||
159 | /* | |
160 | * finalise part of a write to a page | |
161 | */ | |
15b4650e NP |
162 | int afs_write_end(struct file *file, struct address_space *mapping, |
163 | loff_t pos, unsigned len, unsigned copied, | |
164 | struct page *page, void *fsdata) | |
31143d5d | 165 | { |
496ad9aa | 166 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); |
215804a9 | 167 | struct key *key = afs_file_key(file); |
f792e3ac DH |
168 | unsigned long priv; |
169 | unsigned int f, from = pos & (PAGE_SIZE - 1); | |
170 | unsigned int t, to = from + copied; | |
31143d5d | 171 | loff_t i_size, maybe_i_size; |
e8e581a8 | 172 | int ret; |
31143d5d | 173 | |
3b6492df | 174 | _enter("{%llx:%llu},{%lx}", |
15b4650e | 175 | vnode->fid.vid, vnode->fid.vnode, page->index); |
31143d5d | 176 | |
15b4650e | 177 | maybe_i_size = pos + copied; |
31143d5d DH |
178 | |
179 | i_size = i_size_read(&vnode->vfs_inode); | |
180 | if (maybe_i_size > i_size) { | |
1f32ef79 | 181 | write_seqlock(&vnode->cb_lock); |
31143d5d DH |
182 | i_size = i_size_read(&vnode->vfs_inode); |
183 | if (maybe_i_size > i_size) | |
184 | i_size_write(&vnode->vfs_inode, maybe_i_size); | |
1f32ef79 | 185 | write_sequnlock(&vnode->cb_lock); |
31143d5d DH |
186 | } |
187 | ||
e8e581a8 DH |
188 | if (!PageUptodate(page)) { |
189 | if (copied < len) { | |
190 | /* Try and load any missing data from the server. The | |
191 | * unmarshalling routine will take care of clearing any | |
192 | * bits that are beyond the EOF. | |
193 | */ | |
194 | ret = afs_fill_page(vnode, key, pos + copied, | |
195 | len - copied, page); | |
196 | if (ret < 0) | |
afae457d | 197 | goto out; |
e8e581a8 DH |
198 | } |
199 | SetPageUptodate(page); | |
200 | } | |
201 | ||
f792e3ac DH |
202 | if (PagePrivate(page)) { |
203 | priv = page_private(page); | |
185f0c70 DH |
204 | f = afs_page_dirty_from(priv); |
205 | t = afs_page_dirty_to(priv); | |
f792e3ac DH |
206 | if (from < f) |
207 | f = from; | |
208 | if (to > t) | |
209 | t = to; | |
185f0c70 | 210 | priv = afs_page_dirty(f, t); |
f792e3ac DH |
211 | set_page_private(page, priv); |
212 | trace_afs_page_dirty(vnode, tracepoint_string("dirty+"), | |
213 | page->index, priv); | |
214 | } else { | |
185f0c70 | 215 | priv = afs_page_dirty(from, to); |
f792e3ac DH |
216 | attach_page_private(page, (void *)priv); |
217 | trace_afs_page_dirty(vnode, tracepoint_string("dirty"), | |
218 | page->index, priv); | |
219 | } | |
220 | ||
31143d5d | 221 | set_page_dirty(page); |
31143d5d DH |
222 | if (PageDirty(page)) |
223 | _debug("dirtied"); | |
afae457d DH |
224 | ret = copied; |
225 | ||
226 | out: | |
15b4650e | 227 | unlock_page(page); |
09cbfeaf | 228 | put_page(page); |
afae457d | 229 | return ret; |
31143d5d DH |
230 | } |
231 | ||
232 | /* | |
233 | * kill all the pages in the given range | |
234 | */ | |
4343d008 | 235 | static void afs_kill_pages(struct address_space *mapping, |
31143d5d DH |
236 | pgoff_t first, pgoff_t last) |
237 | { | |
4343d008 | 238 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
31143d5d DH |
239 | struct pagevec pv; |
240 | unsigned count, loop; | |
241 | ||
3b6492df | 242 | _enter("{%llx:%llu},%lx-%lx", |
31143d5d DH |
243 | vnode->fid.vid, vnode->fid.vnode, first, last); |
244 | ||
86679820 | 245 | pagevec_init(&pv); |
31143d5d DH |
246 | |
247 | do { | |
248 | _debug("kill %lx-%lx", first, last); | |
249 | ||
250 | count = last - first + 1; | |
251 | if (count > PAGEVEC_SIZE) | |
252 | count = PAGEVEC_SIZE; | |
4343d008 | 253 | pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); |
31143d5d DH |
254 | ASSERTCMP(pv.nr, ==, count); |
255 | ||
256 | for (loop = 0; loop < count; loop++) { | |
7286a35e DH |
257 | struct page *page = pv.pages[loop]; |
258 | ClearPageUptodate(page); | |
4343d008 DH |
259 | SetPageError(page); |
260 | end_page_writeback(page); | |
7286a35e DH |
261 | if (page->index >= first) |
262 | first = page->index + 1; | |
4343d008 DH |
263 | lock_page(page); |
264 | generic_error_remove_page(mapping, page); | |
21bd68f1 | 265 | unlock_page(page); |
31143d5d DH |
266 | } |
267 | ||
268 | __pagevec_release(&pv); | |
4343d008 | 269 | } while (first <= last); |
31143d5d DH |
270 | |
271 | _leave(""); | |
272 | } | |
273 | ||
274 | /* | |
4343d008 DH |
275 | * Redirty all the pages in a given range. |
276 | */ | |
277 | static void afs_redirty_pages(struct writeback_control *wbc, | |
278 | struct address_space *mapping, | |
279 | pgoff_t first, pgoff_t last) | |
280 | { | |
281 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); | |
282 | struct pagevec pv; | |
283 | unsigned count, loop; | |
284 | ||
3b6492df | 285 | _enter("{%llx:%llu},%lx-%lx", |
4343d008 DH |
286 | vnode->fid.vid, vnode->fid.vnode, first, last); |
287 | ||
487e2c9f | 288 | pagevec_init(&pv); |
4343d008 DH |
289 | |
290 | do { | |
291 | _debug("redirty %lx-%lx", first, last); | |
292 | ||
293 | count = last - first + 1; | |
294 | if (count > PAGEVEC_SIZE) | |
295 | count = PAGEVEC_SIZE; | |
296 | pv.nr = find_get_pages_contig(mapping, first, count, pv.pages); | |
297 | ASSERTCMP(pv.nr, ==, count); | |
298 | ||
299 | for (loop = 0; loop < count; loop++) { | |
300 | struct page *page = pv.pages[loop]; | |
301 | ||
302 | redirty_page_for_writepage(wbc, page); | |
303 | end_page_writeback(page); | |
304 | if (page->index >= first) | |
305 | first = page->index + 1; | |
306 | } | |
307 | ||
308 | __pagevec_release(&pv); | |
309 | } while (first <= last); | |
31143d5d DH |
310 | |
311 | _leave(""); | |
312 | } | |
313 | ||
a58823ac DH |
314 | /* |
315 | * completion of write to server | |
316 | */ | |
317 | static void afs_pages_written_back(struct afs_vnode *vnode, | |
318 | pgoff_t first, pgoff_t last) | |
319 | { | |
320 | struct pagevec pv; | |
321 | unsigned long priv; | |
322 | unsigned count, loop; | |
323 | ||
324 | _enter("{%llx:%llu},{%lx-%lx}", | |
325 | vnode->fid.vid, vnode->fid.vnode, first, last); | |
326 | ||
327 | pagevec_init(&pv); | |
328 | ||
329 | do { | |
330 | _debug("done %lx-%lx", first, last); | |
331 | ||
332 | count = last - first + 1; | |
333 | if (count > PAGEVEC_SIZE) | |
334 | count = PAGEVEC_SIZE; | |
335 | pv.nr = find_get_pages_contig(vnode->vfs_inode.i_mapping, | |
336 | first, count, pv.pages); | |
337 | ASSERTCMP(pv.nr, ==, count); | |
338 | ||
339 | for (loop = 0; loop < count; loop++) { | |
fa04a40b | 340 | priv = (unsigned long)detach_page_private(pv.pages[loop]); |
a58823ac DH |
341 | trace_afs_page_dirty(vnode, tracepoint_string("clear"), |
342 | pv.pages[loop]->index, priv); | |
a58823ac DH |
343 | end_page_writeback(pv.pages[loop]); |
344 | } | |
345 | first += count; | |
346 | __pagevec_release(&pv); | |
347 | } while (first <= last); | |
348 | ||
349 | afs_prune_wb_keys(vnode); | |
350 | _leave(""); | |
351 | } | |
352 | ||
d2ddc776 | 353 | /* |
e49c7b2f DH |
354 | * Find a key to use for the writeback. We cached the keys used to author the |
355 | * writes on the vnode. *_wbk will contain the last writeback key used or NULL | |
356 | * and we need to start from there if it's set. | |
d2ddc776 | 357 | */ |
e49c7b2f DH |
358 | static int afs_get_writeback_key(struct afs_vnode *vnode, |
359 | struct afs_wb_key **_wbk) | |
d2ddc776 | 360 | { |
4343d008 DH |
361 | struct afs_wb_key *wbk = NULL; |
362 | struct list_head *p; | |
363 | int ret = -ENOKEY, ret2; | |
d2ddc776 | 364 | |
4343d008 | 365 | spin_lock(&vnode->wb_lock); |
e49c7b2f DH |
366 | if (*_wbk) |
367 | p = (*_wbk)->vnode_link.next; | |
368 | else | |
369 | p = vnode->wb_keys.next; | |
4343d008 | 370 | |
4343d008 DH |
371 | while (p != &vnode->wb_keys) { |
372 | wbk = list_entry(p, struct afs_wb_key, vnode_link); | |
373 | _debug("wbk %u", key_serial(wbk->key)); | |
374 | ret2 = key_validate(wbk->key); | |
e49c7b2f DH |
375 | if (ret2 == 0) { |
376 | refcount_inc(&wbk->usage); | |
377 | _debug("USE WB KEY %u", key_serial(wbk->key)); | |
378 | break; | |
379 | } | |
380 | ||
381 | wbk = NULL; | |
4343d008 DH |
382 | if (ret == -ENOKEY) |
383 | ret = ret2; | |
384 | p = p->next; | |
385 | } | |
386 | ||
387 | spin_unlock(&vnode->wb_lock); | |
e49c7b2f DH |
388 | if (*_wbk) |
389 | afs_put_wb_key(*_wbk); | |
390 | *_wbk = wbk; | |
391 | return 0; | |
392 | } | |
4343d008 | 393 | |
e49c7b2f DH |
394 | static void afs_store_data_success(struct afs_operation *op) |
395 | { | |
396 | struct afs_vnode *vnode = op->file[0].vnode; | |
4343d008 | 397 | |
da8d0755 | 398 | op->ctime = op->file[0].scb.status.mtime_client; |
e49c7b2f DH |
399 | afs_vnode_commit_status(op, &op->file[0]); |
400 | if (op->error == 0) { | |
d383e346 DH |
401 | if (!op->store.laundering) |
402 | afs_pages_written_back(vnode, op->store.first, op->store.last); | |
e49c7b2f DH |
403 | afs_stat_v(vnode, n_stores); |
404 | atomic_long_add((op->store.last * PAGE_SIZE + op->store.last_to) - | |
405 | (op->store.first * PAGE_SIZE + op->store.first_offset), | |
406 | &afs_v2net(vnode)->n_store_bytes); | |
407 | } | |
408 | } | |
4343d008 | 409 | |
e49c7b2f DH |
410 | static const struct afs_operation_ops afs_store_data_operation = { |
411 | .issue_afs_rpc = afs_fs_store_data, | |
412 | .issue_yfs_rpc = yfs_fs_store_data, | |
413 | .success = afs_store_data_success, | |
414 | }; | |
a58823ac | 415 | |
e49c7b2f DH |
416 | /* |
417 | * write to a file | |
418 | */ | |
419 | static int afs_store_data(struct address_space *mapping, | |
420 | pgoff_t first, pgoff_t last, | |
d383e346 | 421 | unsigned offset, unsigned to, bool laundering) |
e49c7b2f DH |
422 | { |
423 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); | |
424 | struct afs_operation *op; | |
425 | struct afs_wb_key *wbk = NULL; | |
426 | int ret; | |
427 | ||
428 | _enter("%s{%llx:%llu.%u},%lx,%lx,%x,%x", | |
429 | vnode->volume->name, | |
430 | vnode->fid.vid, | |
431 | vnode->fid.vnode, | |
432 | vnode->fid.unique, | |
433 | first, last, offset, to); | |
d2ddc776 | 434 | |
e49c7b2f DH |
435 | ret = afs_get_writeback_key(vnode, &wbk); |
436 | if (ret) { | |
437 | _leave(" = %d [no keys]", ret); | |
438 | return ret; | |
d2ddc776 DH |
439 | } |
440 | ||
e49c7b2f DH |
441 | op = afs_alloc_operation(wbk->key, vnode->volume); |
442 | if (IS_ERR(op)) { | |
443 | afs_put_wb_key(wbk); | |
444 | return -ENOMEM; | |
445 | } | |
446 | ||
447 | afs_op_set_vnode(op, 0, vnode); | |
448 | op->file[0].dv_delta = 1; | |
449 | op->store.mapping = mapping; | |
450 | op->store.first = first; | |
451 | op->store.last = last; | |
452 | op->store.first_offset = offset; | |
453 | op->store.last_to = to; | |
d383e346 | 454 | op->store.laundering = laundering; |
b3597945 | 455 | op->mtime = vnode->vfs_inode.i_mtime; |
811f04ba | 456 | op->flags |= AFS_OPERATION_UNINTR; |
e49c7b2f DH |
457 | op->ops = &afs_store_data_operation; |
458 | ||
459 | try_next_key: | |
460 | afs_begin_vnode_operation(op); | |
461 | afs_wait_for_operation(op); | |
462 | ||
463 | switch (op->error) { | |
4343d008 DH |
464 | case -EACCES: |
465 | case -EPERM: | |
466 | case -ENOKEY: | |
467 | case -EKEYEXPIRED: | |
468 | case -EKEYREJECTED: | |
469 | case -EKEYREVOKED: | |
470 | _debug("next"); | |
e49c7b2f DH |
471 | |
472 | ret = afs_get_writeback_key(vnode, &wbk); | |
473 | if (ret == 0) { | |
474 | key_put(op->key); | |
475 | op->key = key_get(wbk->key); | |
476 | goto try_next_key; | |
477 | } | |
478 | break; | |
4343d008 DH |
479 | } |
480 | ||
481 | afs_put_wb_key(wbk); | |
e49c7b2f DH |
482 | _leave(" = %d", op->error); |
483 | return afs_put_operation(op); | |
d2ddc776 DH |
484 | } |
485 | ||
31143d5d | 486 | /* |
4343d008 DH |
487 | * Synchronously write back the locked page and any subsequent non-locked dirty |
488 | * pages. | |
31143d5d | 489 | */ |
4343d008 DH |
490 | static int afs_write_back_from_locked_page(struct address_space *mapping, |
491 | struct writeback_control *wbc, | |
492 | struct page *primary_page, | |
493 | pgoff_t final_page) | |
31143d5d | 494 | { |
13524ab3 | 495 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
31143d5d | 496 | struct page *pages[8], *page; |
4343d008 DH |
497 | unsigned long count, priv; |
498 | unsigned n, offset, to, f, t; | |
31143d5d | 499 | pgoff_t start, first, last; |
793fe82e | 500 | loff_t i_size, end; |
31143d5d DH |
501 | int loop, ret; |
502 | ||
503 | _enter(",%lx", primary_page->index); | |
504 | ||
505 | count = 1; | |
31143d5d DH |
506 | if (test_set_page_writeback(primary_page)) |
507 | BUG(); | |
508 | ||
4343d008 DH |
509 | /* Find all consecutive lockable dirty pages that have contiguous |
510 | * written regions, stopping when we find a page that is not | |
511 | * immediately lockable, is not dirty or is missing, or we reach the | |
512 | * end of the range. | |
513 | */ | |
31143d5d | 514 | start = primary_page->index; |
4343d008 | 515 | priv = page_private(primary_page); |
185f0c70 DH |
516 | offset = afs_page_dirty_from(priv); |
517 | to = afs_page_dirty_to(priv); | |
13524ab3 DH |
518 | trace_afs_page_dirty(vnode, tracepoint_string("store"), |
519 | primary_page->index, priv); | |
4343d008 DH |
520 | |
521 | WARN_ON(offset == to); | |
13524ab3 DH |
522 | if (offset == to) |
523 | trace_afs_page_dirty(vnode, tracepoint_string("WARN"), | |
524 | primary_page->index, priv); | |
4343d008 | 525 | |
5a813276 DH |
526 | if (start >= final_page || |
527 | (to < PAGE_SIZE && !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags))) | |
31143d5d | 528 | goto no_more; |
4343d008 | 529 | |
31143d5d DH |
530 | start++; |
531 | do { | |
532 | _debug("more %lx [%lx]", start, count); | |
4343d008 | 533 | n = final_page - start + 1; |
31143d5d DH |
534 | if (n > ARRAY_SIZE(pages)) |
535 | n = ARRAY_SIZE(pages); | |
4343d008 | 536 | n = find_get_pages_contig(mapping, start, ARRAY_SIZE(pages), pages); |
31143d5d DH |
537 | _debug("fgpc %u", n); |
538 | if (n == 0) | |
539 | goto no_more; | |
540 | if (pages[0]->index != start) { | |
9d577b6a DH |
541 | do { |
542 | put_page(pages[--n]); | |
543 | } while (n > 0); | |
31143d5d DH |
544 | goto no_more; |
545 | } | |
546 | ||
547 | for (loop = 0; loop < n; loop++) { | |
548 | page = pages[loop]; | |
5a813276 DH |
549 | if (to != PAGE_SIZE && |
550 | !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) | |
551 | break; | |
4343d008 | 552 | if (page->index > final_page) |
31143d5d | 553 | break; |
529ae9aa | 554 | if (!trylock_page(page)) |
31143d5d | 555 | break; |
4343d008 | 556 | if (!PageDirty(page) || PageWriteback(page)) { |
31143d5d DH |
557 | unlock_page(page); |
558 | break; | |
559 | } | |
4343d008 DH |
560 | |
561 | priv = page_private(page); | |
185f0c70 DH |
562 | f = afs_page_dirty_from(priv); |
563 | t = afs_page_dirty_to(priv); | |
5a813276 DH |
564 | if (f != 0 && |
565 | !test_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags)) { | |
31143d5d DH |
566 | unlock_page(page); |
567 | break; | |
568 | } | |
4343d008 DH |
569 | to = t; |
570 | ||
13524ab3 DH |
571 | trace_afs_page_dirty(vnode, tracepoint_string("store+"), |
572 | page->index, priv); | |
573 | ||
31143d5d DH |
574 | if (!clear_page_dirty_for_io(page)) |
575 | BUG(); | |
576 | if (test_set_page_writeback(page)) | |
577 | BUG(); | |
578 | unlock_page(page); | |
579 | put_page(page); | |
580 | } | |
581 | count += loop; | |
582 | if (loop < n) { | |
583 | for (; loop < n; loop++) | |
584 | put_page(pages[loop]); | |
585 | goto no_more; | |
586 | } | |
587 | ||
588 | start += loop; | |
4343d008 | 589 | } while (start <= final_page && count < 65536); |
31143d5d DH |
590 | |
591 | no_more: | |
4343d008 DH |
592 | /* We now have a contiguous set of dirty pages, each with writeback |
593 | * set; the first page is still locked at this point, but all the rest | |
594 | * have been unlocked. | |
595 | */ | |
596 | unlock_page(primary_page); | |
597 | ||
31143d5d DH |
598 | first = primary_page->index; |
599 | last = first + count - 1; | |
600 | ||
793fe82e DH |
601 | end = (loff_t)last * PAGE_SIZE + to; |
602 | i_size = i_size_read(&vnode->vfs_inode); | |
603 | ||
31143d5d | 604 | _debug("write back %lx[%u..] to %lx[..%u]", first, offset, last, to); |
793fe82e DH |
605 | if (end > i_size) |
606 | to = i_size & ~PAGE_MASK; | |
31143d5d | 607 | |
d383e346 | 608 | ret = afs_store_data(mapping, first, last, offset, to, false); |
4343d008 DH |
609 | switch (ret) { |
610 | case 0: | |
31143d5d | 611 | ret = count; |
4343d008 DH |
612 | break; |
613 | ||
614 | default: | |
615 | pr_notice("kAFS: Unexpected error from FS.StoreData %d\n", ret); | |
df561f66 | 616 | fallthrough; |
4343d008 DH |
617 | case -EACCES: |
618 | case -EPERM: | |
619 | case -ENOKEY: | |
620 | case -EKEYEXPIRED: | |
621 | case -EKEYREJECTED: | |
622 | case -EKEYREVOKED: | |
623 | afs_redirty_pages(wbc, mapping, first, last); | |
624 | mapping_set_error(mapping, ret); | |
625 | break; | |
626 | ||
627 | case -EDQUOT: | |
628 | case -ENOSPC: | |
629 | afs_redirty_pages(wbc, mapping, first, last); | |
630 | mapping_set_error(mapping, -ENOSPC); | |
631 | break; | |
632 | ||
633 | case -EROFS: | |
634 | case -EIO: | |
635 | case -EREMOTEIO: | |
636 | case -EFBIG: | |
637 | case -ENOENT: | |
638 | case -ENOMEDIUM: | |
639 | case -ENXIO: | |
f51375cd | 640 | trace_afs_file_error(vnode, ret, afs_file_error_writeback_fail); |
4343d008 DH |
641 | afs_kill_pages(mapping, first, last); |
642 | mapping_set_error(mapping, ret); | |
643 | break; | |
31143d5d DH |
644 | } |
645 | ||
646 | _leave(" = %d", ret); | |
647 | return ret; | |
648 | } | |
649 | ||
650 | /* | |
651 | * write a page back to the server | |
652 | * - the caller locked the page for us | |
653 | */ | |
654 | int afs_writepage(struct page *page, struct writeback_control *wbc) | |
655 | { | |
31143d5d DH |
656 | int ret; |
657 | ||
658 | _enter("{%lx},", page->index); | |
659 | ||
4343d008 DH |
660 | ret = afs_write_back_from_locked_page(page->mapping, wbc, page, |
661 | wbc->range_end >> PAGE_SHIFT); | |
31143d5d DH |
662 | if (ret < 0) { |
663 | _leave(" = %d", ret); | |
664 | return 0; | |
665 | } | |
666 | ||
667 | wbc->nr_to_write -= ret; | |
31143d5d DH |
668 | |
669 | _leave(" = 0"); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | /* | |
674 | * write a region of pages back to the server | |
675 | */ | |
c1206a2c AB |
676 | static int afs_writepages_region(struct address_space *mapping, |
677 | struct writeback_control *wbc, | |
678 | pgoff_t index, pgoff_t end, pgoff_t *_next) | |
31143d5d | 679 | { |
31143d5d DH |
680 | struct page *page; |
681 | int ret, n; | |
682 | ||
683 | _enter(",,%lx,%lx,", index, end); | |
684 | ||
685 | do { | |
aef6e415 JK |
686 | n = find_get_pages_range_tag(mapping, &index, end, |
687 | PAGECACHE_TAG_DIRTY, 1, &page); | |
31143d5d DH |
688 | if (!n) |
689 | break; | |
690 | ||
691 | _debug("wback %lx", page->index); | |
692 | ||
b93b0163 MW |
693 | /* |
694 | * at this point we hold neither the i_pages lock nor the | |
695 | * page lock: the page may be truncated or invalidated | |
696 | * (changing page->mapping to NULL), or even swizzled | |
697 | * back from swapper_space to tmpfs file mapping | |
31143d5d | 698 | */ |
4343d008 DH |
699 | ret = lock_page_killable(page); |
700 | if (ret < 0) { | |
701 | put_page(page); | |
702 | _leave(" = %d", ret); | |
703 | return ret; | |
704 | } | |
31143d5d | 705 | |
c5051c7b | 706 | if (page->mapping != mapping || !PageDirty(page)) { |
31143d5d | 707 | unlock_page(page); |
09cbfeaf | 708 | put_page(page); |
31143d5d DH |
709 | continue; |
710 | } | |
711 | ||
c5051c7b | 712 | if (PageWriteback(page)) { |
31143d5d | 713 | unlock_page(page); |
c5051c7b DH |
714 | if (wbc->sync_mode != WB_SYNC_NONE) |
715 | wait_on_page_writeback(page); | |
29c8bbbd | 716 | put_page(page); |
31143d5d DH |
717 | continue; |
718 | } | |
719 | ||
65a15109 DH |
720 | if (!clear_page_dirty_for_io(page)) |
721 | BUG(); | |
4343d008 | 722 | ret = afs_write_back_from_locked_page(mapping, wbc, page, end); |
09cbfeaf | 723 | put_page(page); |
31143d5d DH |
724 | if (ret < 0) { |
725 | _leave(" = %d", ret); | |
726 | return ret; | |
727 | } | |
728 | ||
729 | wbc->nr_to_write -= ret; | |
730 | ||
31143d5d DH |
731 | cond_resched(); |
732 | } while (index < end && wbc->nr_to_write > 0); | |
733 | ||
734 | *_next = index; | |
735 | _leave(" = 0 [%lx]", *_next); | |
736 | return 0; | |
737 | } | |
738 | ||
739 | /* | |
740 | * write some of the pending data back to the server | |
741 | */ | |
742 | int afs_writepages(struct address_space *mapping, | |
743 | struct writeback_control *wbc) | |
744 | { | |
ec0fa0b6 | 745 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); |
31143d5d DH |
746 | pgoff_t start, end, next; |
747 | int ret; | |
748 | ||
749 | _enter(""); | |
750 | ||
ec0fa0b6 DH |
751 | /* We have to be careful as we can end up racing with setattr() |
752 | * truncating the pagecache since the caller doesn't take a lock here | |
753 | * to prevent it. | |
754 | */ | |
755 | if (wbc->sync_mode == WB_SYNC_ALL) | |
756 | down_read(&vnode->validate_lock); | |
757 | else if (!down_read_trylock(&vnode->validate_lock)) | |
758 | return 0; | |
759 | ||
31143d5d DH |
760 | if (wbc->range_cyclic) { |
761 | start = mapping->writeback_index; | |
762 | end = -1; | |
763 | ret = afs_writepages_region(mapping, wbc, start, end, &next); | |
1b430bee | 764 | if (start > 0 && wbc->nr_to_write > 0 && ret == 0) |
31143d5d DH |
765 | ret = afs_writepages_region(mapping, wbc, 0, start, |
766 | &next); | |
767 | mapping->writeback_index = next; | |
768 | } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) { | |
09cbfeaf | 769 | end = (pgoff_t)(LLONG_MAX >> PAGE_SHIFT); |
31143d5d DH |
770 | ret = afs_writepages_region(mapping, wbc, 0, end, &next); |
771 | if (wbc->nr_to_write > 0) | |
772 | mapping->writeback_index = next; | |
773 | } else { | |
09cbfeaf KS |
774 | start = wbc->range_start >> PAGE_SHIFT; |
775 | end = wbc->range_end >> PAGE_SHIFT; | |
31143d5d DH |
776 | ret = afs_writepages_region(mapping, wbc, start, end, &next); |
777 | } | |
778 | ||
ec0fa0b6 | 779 | up_read(&vnode->validate_lock); |
31143d5d DH |
780 | _leave(" = %d", ret); |
781 | return ret; | |
782 | } | |
783 | ||
31143d5d DH |
784 | /* |
785 | * write to an AFS file | |
786 | */ | |
50b5551d | 787 | ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) |
31143d5d | 788 | { |
496ad9aa | 789 | struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); |
31143d5d | 790 | ssize_t result; |
50b5551d | 791 | size_t count = iov_iter_count(from); |
31143d5d | 792 | |
3b6492df | 793 | _enter("{%llx:%llu},{%zu},", |
50b5551d | 794 | vnode->fid.vid, vnode->fid.vnode, count); |
31143d5d DH |
795 | |
796 | if (IS_SWAPFILE(&vnode->vfs_inode)) { | |
797 | printk(KERN_INFO | |
798 | "AFS: Attempt to write to active swap file!\n"); | |
799 | return -EBUSY; | |
800 | } | |
801 | ||
802 | if (!count) | |
803 | return 0; | |
804 | ||
50b5551d | 805 | result = generic_file_write_iter(iocb, from); |
31143d5d | 806 | |
31143d5d DH |
807 | _leave(" = %zd", result); |
808 | return result; | |
809 | } | |
810 | ||
31143d5d DH |
811 | /* |
812 | * flush any dirty pages for this process, and check for write errors. | |
813 | * - the return status from this call provides a reliable indication of | |
814 | * whether any write errors occurred for this process. | |
815 | */ | |
02c24a82 | 816 | int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
31143d5d | 817 | { |
3c981bfc | 818 | struct inode *inode = file_inode(file); |
3c981bfc | 819 | struct afs_vnode *vnode = AFS_FS_I(inode); |
31143d5d | 820 | |
3b6492df | 821 | _enter("{%llx:%llu},{n=%pD},%d", |
3c981bfc | 822 | vnode->fid.vid, vnode->fid.vnode, file, |
31143d5d DH |
823 | datasync); |
824 | ||
4343d008 | 825 | return file_write_and_wait_range(file, start, end); |
31143d5d | 826 | } |
9b3f26c9 DH |
827 | |
828 | /* | |
829 | * notification that a previously read-only page is about to become writable | |
830 | * - if it returns an error, the caller will deliver a bus error signal | |
831 | */ | |
0722f186 | 832 | vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) |
9b3f26c9 | 833 | { |
1cf7a151 DH |
834 | struct file *file = vmf->vma->vm_file; |
835 | struct inode *inode = file_inode(file); | |
836 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
837 | unsigned long priv; | |
9b3f26c9 | 838 | |
3b6492df | 839 | _enter("{{%llx:%llu}},{%lx}", |
1cf7a151 | 840 | vnode->fid.vid, vnode->fid.vnode, vmf->page->index); |
9b3f26c9 | 841 | |
1cf7a151 | 842 | sb_start_pagefault(inode->i_sb); |
9b3f26c9 | 843 | |
1cf7a151 DH |
844 | /* Wait for the page to be written to the cache before we allow it to |
845 | * be modified. We then assume the entire page will need writing back. | |
846 | */ | |
9b3f26c9 | 847 | #ifdef CONFIG_AFS_FSCACHE |
1cf7a151 | 848 | fscache_wait_on_page_write(vnode->cache, vmf->page); |
9b3f26c9 DH |
849 | #endif |
850 | ||
1cf7a151 DH |
851 | if (PageWriteback(vmf->page) && |
852 | wait_on_page_bit_killable(vmf->page, PG_writeback) < 0) | |
853 | return VM_FAULT_RETRY; | |
854 | ||
855 | if (lock_page_killable(vmf->page) < 0) | |
856 | return VM_FAULT_RETRY; | |
857 | ||
858 | /* We mustn't change page->private until writeback is complete as that | |
859 | * details the portion of the page we need to write back and we might | |
860 | * need to redirty the page if there's a problem. | |
861 | */ | |
862 | wait_on_page_writeback(vmf->page); | |
863 | ||
185f0c70 | 864 | priv = afs_page_dirty(0, PAGE_SIZE); |
f86726a6 | 865 | priv = afs_page_dirty_mmapped(priv); |
13524ab3 DH |
866 | trace_afs_page_dirty(vnode, tracepoint_string("mkwrite"), |
867 | vmf->page->index, priv); | |
fa04a40b DH |
868 | if (PagePrivate(vmf->page)) |
869 | set_page_private(vmf->page, priv); | |
870 | else | |
871 | attach_page_private(vmf->page, (void *)priv); | |
bb413489 | 872 | file_update_time(file); |
1cf7a151 DH |
873 | |
874 | sb_end_pagefault(inode->i_sb); | |
875 | return VM_FAULT_LOCKED; | |
9b3f26c9 | 876 | } |
4343d008 DH |
877 | |
878 | /* | |
879 | * Prune the keys cached for writeback. The caller must hold vnode->wb_lock. | |
880 | */ | |
881 | void afs_prune_wb_keys(struct afs_vnode *vnode) | |
882 | { | |
883 | LIST_HEAD(graveyard); | |
884 | struct afs_wb_key *wbk, *tmp; | |
885 | ||
886 | /* Discard unused keys */ | |
887 | spin_lock(&vnode->wb_lock); | |
888 | ||
889 | if (!mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_WRITEBACK) && | |
890 | !mapping_tagged(&vnode->vfs_inode.i_data, PAGECACHE_TAG_DIRTY)) { | |
891 | list_for_each_entry_safe(wbk, tmp, &vnode->wb_keys, vnode_link) { | |
892 | if (refcount_read(&wbk->usage) == 1) | |
893 | list_move(&wbk->vnode_link, &graveyard); | |
894 | } | |
895 | } | |
896 | ||
897 | spin_unlock(&vnode->wb_lock); | |
898 | ||
899 | while (!list_empty(&graveyard)) { | |
900 | wbk = list_entry(graveyard.next, struct afs_wb_key, vnode_link); | |
901 | list_del(&wbk->vnode_link); | |
902 | afs_put_wb_key(wbk); | |
903 | } | |
904 | } | |
905 | ||
906 | /* | |
907 | * Clean up a page during invalidation. | |
908 | */ | |
909 | int afs_launder_page(struct page *page) | |
910 | { | |
911 | struct address_space *mapping = page->mapping; | |
912 | struct afs_vnode *vnode = AFS_FS_I(mapping->host); | |
913 | unsigned long priv; | |
914 | unsigned int f, t; | |
915 | int ret = 0; | |
916 | ||
917 | _enter("{%lx}", page->index); | |
918 | ||
919 | priv = page_private(page); | |
920 | if (clear_page_dirty_for_io(page)) { | |
921 | f = 0; | |
922 | t = PAGE_SIZE; | |
923 | if (PagePrivate(page)) { | |
185f0c70 DH |
924 | f = afs_page_dirty_from(priv); |
925 | t = afs_page_dirty_to(priv); | |
4343d008 DH |
926 | } |
927 | ||
13524ab3 DH |
928 | trace_afs_page_dirty(vnode, tracepoint_string("launder"), |
929 | page->index, priv); | |
d383e346 | 930 | ret = afs_store_data(mapping, page->index, page->index, t, f, true); |
4343d008 DH |
931 | } |
932 | ||
fa04a40b | 933 | priv = (unsigned long)detach_page_private(page); |
13524ab3 DH |
934 | trace_afs_page_dirty(vnode, tracepoint_string("laundered"), |
935 | page->index, priv); | |
4343d008 DH |
936 | |
937 | #ifdef CONFIG_AFS_FSCACHE | |
938 | if (PageFsCache(page)) { | |
939 | fscache_wait_on_page_write(vnode->cache, page); | |
940 | fscache_uncache_page(vnode->cache, page); | |
941 | } | |
942 | #endif | |
943 | return ret; | |
9b3f26c9 | 944 | } |