]>
Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
08e0e7c8 | 2 | /* AFS filesystem file handling |
1da177e4 | 3 | * |
08e0e7c8 | 4 | * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. |
1da177e4 | 5 | * Written by David Howells (dhowells@redhat.com) |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
1da177e4 LT |
11 | #include <linux/fs.h> |
12 | #include <linux/pagemap.h> | |
31143d5d | 13 | #include <linux/writeback.h> |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
91b467e0 | 15 | #include <linux/task_io_accounting_ops.h> |
f86196ea | 16 | #include <linux/mm.h> |
d7bdba1c | 17 | #include <linux/swap.h> |
5cbf0398 | 18 | #include <linux/netfs.h> |
1da177e4 LT |
19 | #include "internal.h" |
20 | ||
1cf7a151 | 21 | static int afs_file_mmap(struct file *file, struct vm_area_struct *vma); |
d7e0f539 | 22 | static int afs_symlink_read_folio(struct file *file, struct folio *folio); |
fcf227da MWO |
23 | static void afs_invalidate_folio(struct folio *folio, size_t offset, |
24 | size_t length); | |
508cae68 | 25 | static bool afs_release_folio(struct folio *folio, gfp_t gfp_flags); |
1da177e4 | 26 | |
3978d816 | 27 | static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter); |
6e0e99d5 DH |
28 | static void afs_vm_open(struct vm_area_struct *area); |
29 | static void afs_vm_close(struct vm_area_struct *area); | |
30 | static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff); | |
9b3f26c9 | 31 | |
00d3b7a4 DH |
32 | const struct file_operations afs_file_operations = { |
33 | .open = afs_open, | |
34 | .release = afs_release, | |
35 | .llseek = generic_file_llseek, | |
3978d816 | 36 | .read_iter = afs_file_read_iter, |
50b5551d | 37 | .write_iter = afs_file_write, |
1cf7a151 | 38 | .mmap = afs_file_mmap, |
5ffc4ef4 | 39 | .splice_read = generic_file_splice_read, |
06a17bbe | 40 | .splice_write = iter_file_splice_write, |
31143d5d | 41 | .fsync = afs_fsync, |
e8d6c554 DH |
42 | .lock = afs_lock, |
43 | .flock = afs_flock, | |
00d3b7a4 DH |
44 | }; |
45 | ||
754661f1 | 46 | const struct inode_operations afs_file_inode_operations = { |
416351f2 | 47 | .getattr = afs_getattr, |
31143d5d | 48 | .setattr = afs_setattr, |
00d3b7a4 | 49 | .permission = afs_permission, |
1da177e4 LT |
50 | }; |
51 | ||
75bd228d | 52 | const struct address_space_operations afs_file_aops = { |
6c62371b | 53 | .read_folio = netfs_read_folio, |
bc899ee1 | 54 | .readahead = netfs_readahead, |
8fb72b4a | 55 | .dirty_folio = afs_dirty_folio, |
a42442dd | 56 | .launder_folio = afs_launder_folio, |
508cae68 | 57 | .release_folio = afs_release_folio, |
fcf227da | 58 | .invalidate_folio = afs_invalidate_folio, |
15b4650e NP |
59 | .write_begin = afs_write_begin, |
60 | .write_end = afs_write_end, | |
31143d5d DH |
61 | .writepage = afs_writepage, |
62 | .writepages = afs_writepages, | |
1da177e4 LT |
63 | }; |
64 | ||
75bd228d | 65 | const struct address_space_operations afs_symlink_aops = { |
d7e0f539 | 66 | .read_folio = afs_symlink_read_folio, |
508cae68 | 67 | .release_folio = afs_release_folio, |
fcf227da | 68 | .invalidate_folio = afs_invalidate_folio, |
75bd228d DH |
69 | }; |
70 | ||
1cf7a151 | 71 | static const struct vm_operations_struct afs_vm_ops = { |
6e0e99d5 DH |
72 | .open = afs_vm_open, |
73 | .close = afs_vm_close, | |
1cf7a151 | 74 | .fault = filemap_fault, |
6e0e99d5 | 75 | .map_pages = afs_vm_map_pages, |
1cf7a151 DH |
76 | .page_mkwrite = afs_page_mkwrite, |
77 | }; | |
78 | ||
4343d008 DH |
79 | /* |
80 | * Discard a pin on a writeback key. | |
81 | */ | |
82 | void afs_put_wb_key(struct afs_wb_key *wbk) | |
83 | { | |
e49c7b2f | 84 | if (wbk && refcount_dec_and_test(&wbk->usage)) { |
4343d008 DH |
85 | key_put(wbk->key); |
86 | kfree(wbk); | |
87 | } | |
88 | } | |
89 | ||
90 | /* | |
91 | * Cache key for writeback. | |
92 | */ | |
93 | int afs_cache_wb_key(struct afs_vnode *vnode, struct afs_file *af) | |
94 | { | |
95 | struct afs_wb_key *wbk, *p; | |
96 | ||
97 | wbk = kzalloc(sizeof(struct afs_wb_key), GFP_KERNEL); | |
98 | if (!wbk) | |
99 | return -ENOMEM; | |
100 | refcount_set(&wbk->usage, 2); | |
101 | wbk->key = af->key; | |
102 | ||
103 | spin_lock(&vnode->wb_lock); | |
104 | list_for_each_entry(p, &vnode->wb_keys, vnode_link) { | |
105 | if (p->key == wbk->key) | |
106 | goto found; | |
107 | } | |
108 | ||
109 | key_get(wbk->key); | |
110 | list_add_tail(&wbk->vnode_link, &vnode->wb_keys); | |
111 | spin_unlock(&vnode->wb_lock); | |
112 | af->wb = wbk; | |
113 | return 0; | |
114 | ||
115 | found: | |
116 | refcount_inc(&p->usage); | |
117 | spin_unlock(&vnode->wb_lock); | |
118 | af->wb = p; | |
119 | kfree(wbk); | |
120 | return 0; | |
121 | } | |
122 | ||
00d3b7a4 DH |
123 | /* |
124 | * open an AFS file or directory and attach a key to it | |
125 | */ | |
126 | int afs_open(struct inode *inode, struct file *file) | |
127 | { | |
128 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
215804a9 | 129 | struct afs_file *af; |
00d3b7a4 | 130 | struct key *key; |
260a9803 | 131 | int ret; |
00d3b7a4 | 132 | |
3b6492df | 133 | _enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode); |
00d3b7a4 DH |
134 | |
135 | key = afs_request_key(vnode->volume->cell); | |
136 | if (IS_ERR(key)) { | |
215804a9 DH |
137 | ret = PTR_ERR(key); |
138 | goto error; | |
00d3b7a4 DH |
139 | } |
140 | ||
215804a9 DH |
141 | af = kzalloc(sizeof(*af), GFP_KERNEL); |
142 | if (!af) { | |
143 | ret = -ENOMEM; | |
144 | goto error_key; | |
260a9803 | 145 | } |
4343d008 | 146 | af->key = key; |
260a9803 | 147 | |
215804a9 DH |
148 | ret = afs_validate(vnode, key); |
149 | if (ret < 0) | |
150 | goto error_af; | |
151 | ||
4343d008 DH |
152 | if (file->f_mode & FMODE_WRITE) { |
153 | ret = afs_cache_wb_key(vnode, af); | |
154 | if (ret < 0) | |
155 | goto error_af; | |
156 | } | |
5a813276 DH |
157 | |
158 | if (file->f_flags & O_TRUNC) | |
159 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
523d27cd DH |
160 | |
161 | fscache_use_cookie(afs_vnode_cache(vnode), file->f_mode & FMODE_WRITE); | |
162 | ||
215804a9 | 163 | file->private_data = af; |
00d3b7a4 DH |
164 | _leave(" = 0"); |
165 | return 0; | |
215804a9 DH |
166 | |
167 | error_af: | |
168 | kfree(af); | |
169 | error_key: | |
170 | key_put(key); | |
171 | error: | |
172 | _leave(" = %d", ret); | |
173 | return ret; | |
00d3b7a4 DH |
174 | } |
175 | ||
176 | /* | |
177 | * release an AFS file or directory and discard its key | |
178 | */ | |
179 | int afs_release(struct inode *inode, struct file *file) | |
180 | { | |
523d27cd | 181 | struct afs_vnode_cache_aux aux; |
00d3b7a4 | 182 | struct afs_vnode *vnode = AFS_FS_I(inode); |
215804a9 | 183 | struct afs_file *af = file->private_data; |
523d27cd | 184 | loff_t i_size; |
a1b879ee | 185 | int ret = 0; |
00d3b7a4 | 186 | |
3b6492df | 187 | _enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode); |
00d3b7a4 | 188 | |
5a813276 | 189 | if ((file->f_mode & FMODE_WRITE)) |
a1b879ee | 190 | ret = vfs_fsync(file, 0); |
5a813276 | 191 | |
215804a9 | 192 | file->private_data = NULL; |
4343d008 DH |
193 | if (af->wb) |
194 | afs_put_wb_key(af->wb); | |
523d27cd DH |
195 | |
196 | if ((file->f_mode & FMODE_WRITE)) { | |
874c8ca1 | 197 | i_size = i_size_read(&vnode->netfs.inode); |
523d27cd DH |
198 | afs_set_cache_aux(vnode, &aux); |
199 | fscache_unuse_cookie(afs_vnode_cache(vnode), &aux, &i_size); | |
200 | } else { | |
201 | fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL); | |
202 | } | |
203 | ||
215804a9 DH |
204 | key_put(af->key); |
205 | kfree(af); | |
4343d008 | 206 | afs_prune_wb_keys(vnode); |
a1b879ee DH |
207 | _leave(" = %d", ret); |
208 | return ret; | |
00d3b7a4 DH |
209 | } |
210 | ||
c4508464 | 211 | /* |
5cbf0398 | 212 | * Allocate a new read record. |
c4508464 | 213 | */ |
5cbf0398 | 214 | struct afs_read *afs_alloc_read(gfp_t gfp) |
c4508464 | 215 | { |
5cbf0398 | 216 | struct afs_read *req; |
c4508464 | 217 | |
5cbf0398 DH |
218 | req = kzalloc(sizeof(struct afs_read), gfp); |
219 | if (req) | |
220 | refcount_set(&req->usage, 1); | |
c4508464 | 221 | |
5cbf0398 | 222 | return req; |
c4508464 DH |
223 | } |
224 | ||
196ee9cd DH |
225 | /* |
226 | * Dispose of a ref to a read record. | |
227 | */ | |
228 | void afs_put_read(struct afs_read *req) | |
229 | { | |
f3ddee8d | 230 | if (refcount_dec_and_test(&req->usage)) { |
c4508464 DH |
231 | if (req->cleanup) |
232 | req->cleanup(req); | |
c69bf479 | 233 | key_put(req->key); |
196ee9cd DH |
234 | kfree(req); |
235 | } | |
236 | } | |
237 | ||
dc419184 DH |
238 | static void afs_fetch_data_notify(struct afs_operation *op) |
239 | { | |
240 | struct afs_read *req = op->fetch.req; | |
6a19114b | 241 | struct netfs_io_subrequest *subreq = req->subreq; |
dc419184 DH |
242 | int error = op->error; |
243 | ||
244 | if (error == -ECONNABORTED) | |
245 | error = afs_abort_to_error(op->ac.abort_code); | |
246 | req->error = error; | |
247 | ||
5cbf0398 DH |
248 | if (subreq) { |
249 | __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); | |
250 | netfs_subreq_terminated(subreq, error ?: req->actual_len, false); | |
251 | req->subreq = NULL; | |
252 | } else if (req->done) { | |
dc419184 | 253 | req->done(req); |
5cbf0398 | 254 | } |
dc419184 DH |
255 | } |
256 | ||
e49c7b2f DH |
257 | static void afs_fetch_data_success(struct afs_operation *op) |
258 | { | |
259 | struct afs_vnode *vnode = op->file[0].vnode; | |
260 | ||
261 | _enter("op=%08x", op->debug_id); | |
e49c7b2f DH |
262 | afs_vnode_commit_status(op, &op->file[0]); |
263 | afs_stat_v(vnode, n_fetches); | |
264 | atomic_long_add(op->fetch.req->actual_len, &op->net->n_fetch_bytes); | |
dc419184 | 265 | afs_fetch_data_notify(op); |
e49c7b2f DH |
266 | } |
267 | ||
268 | static void afs_fetch_data_put(struct afs_operation *op) | |
269 | { | |
c4508464 | 270 | op->fetch.req->error = op->error; |
e49c7b2f DH |
271 | afs_put_read(op->fetch.req); |
272 | } | |
273 | ||
274 | static const struct afs_operation_ops afs_fetch_data_operation = { | |
275 | .issue_afs_rpc = afs_fs_fetch_data, | |
276 | .issue_yfs_rpc = yfs_fs_fetch_data, | |
277 | .success = afs_fetch_data_success, | |
728279a5 | 278 | .aborted = afs_check_for_remote_deletion, |
dc419184 | 279 | .failed = afs_fetch_data_notify, |
e49c7b2f DH |
280 | .put = afs_fetch_data_put, |
281 | }; | |
282 | ||
d2ddc776 DH |
283 | /* |
284 | * Fetch file data from the volume. | |
285 | */ | |
c69bf479 | 286 | int afs_fetch_data(struct afs_vnode *vnode, struct afs_read *req) |
d2ddc776 | 287 | { |
e49c7b2f | 288 | struct afs_operation *op; |
d2ddc776 | 289 | |
3b6492df | 290 | _enter("%s{%llx:%llu.%u},%x,,,", |
d2ddc776 DH |
291 | vnode->volume->name, |
292 | vnode->fid.vid, | |
293 | vnode->fid.vnode, | |
294 | vnode->fid.unique, | |
c69bf479 | 295 | key_serial(req->key)); |
d2ddc776 | 296 | |
c69bf479 | 297 | op = afs_alloc_operation(req->key, vnode->volume); |
5cbf0398 DH |
298 | if (IS_ERR(op)) { |
299 | if (req->subreq) | |
300 | netfs_subreq_terminated(req->subreq, PTR_ERR(op), false); | |
e49c7b2f | 301 | return PTR_ERR(op); |
5cbf0398 | 302 | } |
a58823ac | 303 | |
e49c7b2f | 304 | afs_op_set_vnode(op, 0, vnode); |
d2ddc776 | 305 | |
e49c7b2f DH |
306 | op->fetch.req = afs_get_read(req); |
307 | op->ops = &afs_fetch_data_operation; | |
308 | return afs_do_sync_operation(op); | |
d2ddc776 DH |
309 | } |
310 | ||
f18a3785 | 311 | static void afs_issue_read(struct netfs_io_subrequest *subreq) |
1da177e4 | 312 | { |
5cbf0398 DH |
313 | struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode); |
314 | struct afs_read *fsreq; | |
1da177e4 | 315 | |
5cbf0398 DH |
316 | fsreq = afs_alloc_read(GFP_NOFS); |
317 | if (!fsreq) | |
318 | return netfs_subreq_terminated(subreq, -ENOMEM, false); | |
1da177e4 | 319 | |
5cbf0398 DH |
320 | fsreq->subreq = subreq; |
321 | fsreq->pos = subreq->start + subreq->transferred; | |
322 | fsreq->len = subreq->len - subreq->transferred; | |
345e1ae0 | 323 | fsreq->key = key_get(subreq->rreq->netfs_priv); |
5cbf0398 DH |
324 | fsreq->vnode = vnode; |
325 | fsreq->iter = &fsreq->def_iter; | |
03ffae90 | 326 | |
5cbf0398 | 327 | iov_iter_xarray(&fsreq->def_iter, READ, |
874c8ca1 | 328 | &fsreq->vnode->netfs.inode.i_mapping->i_pages, |
5cbf0398 | 329 | fsreq->pos, fsreq->len); |
c4508464 | 330 | |
5cbf0398 | 331 | afs_fetch_data(fsreq->vnode, fsreq); |
345e1ae0 | 332 | afs_put_read(fsreq); |
ec26815a | 333 | } |
1da177e4 | 334 | |
d7e0f539 | 335 | static int afs_symlink_read_folio(struct file *file, struct folio *folio) |
f6d335c0 | 336 | { |
d7e0f539 | 337 | struct afs_vnode *vnode = AFS_FS_I(folio->mapping->host); |
5cbf0398 | 338 | struct afs_read *fsreq; |
f6d335c0 AV |
339 | int ret; |
340 | ||
5cbf0398 DH |
341 | fsreq = afs_alloc_read(GFP_NOFS); |
342 | if (!fsreq) | |
91b467e0 DH |
343 | return -ENOMEM; |
344 | ||
78525c74 DH |
345 | fsreq->pos = folio_pos(folio); |
346 | fsreq->len = folio_size(folio); | |
5cbf0398 DH |
347 | fsreq->vnode = vnode; |
348 | fsreq->iter = &fsreq->def_iter; | |
d7e0f539 | 349 | iov_iter_xarray(&fsreq->def_iter, READ, &folio->mapping->i_pages, |
5cbf0398 | 350 | fsreq->pos, fsreq->len); |
c4508464 | 351 | |
5cbf0398 | 352 | ret = afs_fetch_data(fsreq->vnode, fsreq); |
78525c74 | 353 | if (ret == 0) |
d7e0f539 MWO |
354 | folio_mark_uptodate(folio); |
355 | folio_unlock(folio); | |
5cbf0398 DH |
356 | return ret; |
357 | } | |
91b467e0 | 358 | |
2de16041 | 359 | static int afs_init_request(struct netfs_io_request *rreq, struct file *file) |
5cbf0398 DH |
360 | { |
361 | rreq->netfs_priv = key_get(afs_file_key(file)); | |
2de16041 | 362 | return 0; |
5cbf0398 | 363 | } |
91b467e0 | 364 | |
6a19114b | 365 | static int afs_begin_cache_operation(struct netfs_io_request *rreq) |
5cbf0398 | 366 | { |
2cee6fbb | 367 | #ifdef CONFIG_AFS_FSCACHE |
5cbf0398 | 368 | struct afs_vnode *vnode = AFS_FS_I(rreq->inode); |
91b467e0 | 369 | |
523d27cd DH |
370 | return fscache_begin_read_operation(&rreq->cache_resources, |
371 | afs_vnode_cache(vnode)); | |
2cee6fbb DH |
372 | #else |
373 | return -ENOBUFS; | |
374 | #endif | |
91b467e0 DH |
375 | } |
376 | ||
3003bbd0 | 377 | static int afs_check_write_begin(struct file *file, loff_t pos, unsigned len, |
fac47b43 | 378 | struct folio **foliop, void **_fsdata) |
3003bbd0 DH |
379 | { |
380 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); | |
381 | ||
382 | return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? -ESTALE : 0; | |
383 | } | |
384 | ||
40a81101 | 385 | static void afs_free_request(struct netfs_io_request *rreq) |
1da177e4 | 386 | { |
40a81101 | 387 | key_put(rreq->netfs_priv); |
5cbf0398 | 388 | } |
f6d335c0 | 389 | |
6a19114b DH |
390 | const struct netfs_request_ops afs_req_ops = { |
391 | .init_request = afs_init_request, | |
40a81101 | 392 | .free_request = afs_free_request, |
5cbf0398 | 393 | .begin_cache_operation = afs_begin_cache_operation, |
3003bbd0 | 394 | .check_write_begin = afs_check_write_begin, |
f18a3785 | 395 | .issue_read = afs_issue_read, |
5cbf0398 | 396 | }; |
1da177e4 | 397 | |
c7f75ef3 DH |
398 | int afs_write_inode(struct inode *inode, struct writeback_control *wbc) |
399 | { | |
400 | fscache_unpin_writeback(wbc, afs_vnode_cache(AFS_FS_I(inode))); | |
401 | return 0; | |
402 | } | |
403 | ||
f86726a6 DH |
404 | /* |
405 | * Adjust the dirty region of the page on truncation or full invalidation, | |
406 | * getting rid of the markers altogether if the region is entirely invalidated. | |
407 | */ | |
fcf227da MWO |
408 | static void afs_invalidate_dirty(struct folio *folio, size_t offset, |
409 | size_t length) | |
f86726a6 | 410 | { |
78525c74 | 411 | struct afs_vnode *vnode = AFS_FS_I(folio_inode(folio)); |
f86726a6 DH |
412 | unsigned long priv; |
413 | unsigned int f, t, end = offset + length; | |
414 | ||
78525c74 | 415 | priv = (unsigned long)folio_get_private(folio); |
f86726a6 DH |
416 | |
417 | /* we clean up only if the entire page is being invalidated */ | |
78525c74 | 418 | if (offset == 0 && length == folio_size(folio)) |
f86726a6 DH |
419 | goto full_invalidate; |
420 | ||
421 | /* If the page was dirtied by page_mkwrite(), the PTE stays writable | |
422 | * and we don't get another notification to tell us to expand it | |
423 | * again. | |
424 | */ | |
78525c74 | 425 | if (afs_is_folio_dirty_mmapped(priv)) |
f86726a6 DH |
426 | return; |
427 | ||
428 | /* We may need to shorten the dirty region */ | |
78525c74 DH |
429 | f = afs_folio_dirty_from(folio, priv); |
430 | t = afs_folio_dirty_to(folio, priv); | |
f86726a6 DH |
431 | |
432 | if (t <= offset || f >= end) | |
433 | return; /* Doesn't overlap */ | |
434 | ||
435 | if (f < offset && t > end) | |
436 | return; /* Splits the dirty region - just absorb it */ | |
437 | ||
438 | if (f >= offset && t <= end) | |
439 | goto undirty; | |
440 | ||
441 | if (f < offset) | |
442 | t = offset; | |
443 | else | |
444 | f = end; | |
445 | if (f == t) | |
446 | goto undirty; | |
447 | ||
78525c74 DH |
448 | priv = afs_folio_dirty(folio, f, t); |
449 | folio_change_private(folio, (void *)priv); | |
450 | trace_afs_folio_dirty(vnode, tracepoint_string("trunc"), folio); | |
f86726a6 DH |
451 | return; |
452 | ||
453 | undirty: | |
78525c74 DH |
454 | trace_afs_folio_dirty(vnode, tracepoint_string("undirty"), folio); |
455 | folio_clear_dirty_for_io(folio); | |
f86726a6 | 456 | full_invalidate: |
78525c74 DH |
457 | trace_afs_folio_dirty(vnode, tracepoint_string("inval"), folio); |
458 | folio_detach_private(folio); | |
f86726a6 DH |
459 | } |
460 | ||
1da177e4 | 461 | /* |
9b3f26c9 DH |
462 | * invalidate part or all of a page |
463 | * - release a page and clean up its private data if offset is 0 (indicating | |
464 | * the entire page) | |
465 | */ | |
fcf227da MWO |
466 | static void afs_invalidate_folio(struct folio *folio, size_t offset, |
467 | size_t length) | |
9b3f26c9 | 468 | { |
fcf227da | 469 | _enter("{%lu},%zu,%zu", folio->index, offset, length); |
9b3f26c9 | 470 | |
fcf227da | 471 | BUG_ON(!folio_test_locked(folio)); |
9b3f26c9 | 472 | |
fcf227da | 473 | if (folio_get_private(folio)) |
78525c74 | 474 | afs_invalidate_dirty(folio, offset, length); |
9b3f26c9 | 475 | |
78525c74 | 476 | folio_wait_fscache(folio); |
9b3f26c9 DH |
477 | _leave(""); |
478 | } | |
479 | ||
480 | /* | |
481 | * release a page and clean up its private state if it's not busy | |
482 | * - return true if the page can now be released, false if not | |
1da177e4 | 483 | */ |
508cae68 | 484 | static bool afs_release_folio(struct folio *folio, gfp_t gfp) |
1da177e4 | 485 | { |
78525c74 | 486 | struct afs_vnode *vnode = AFS_FS_I(folio_inode(folio)); |
1da177e4 | 487 | |
3b6492df | 488 | _enter("{{%llx:%llu}[%lu],%lx},%x", |
78525c74 | 489 | vnode->fid.vid, vnode->fid.vnode, folio_index(folio), folio->flags, |
523d27cd | 490 | gfp); |
1da177e4 | 491 | |
508cae68 | 492 | /* deny if folio is being written to the cache and the caller hasn't |
9b3f26c9 | 493 | * elected to wait */ |
630f5dda | 494 | #ifdef CONFIG_AFS_FSCACHE |
78525c74 | 495 | if (folio_test_fscache(folio)) { |
d7bdba1c | 496 | if (current_is_kswapd() || !(gfp & __GFP_FS)) |
630f5dda | 497 | return false; |
78525c74 | 498 | folio_wait_fscache(folio); |
630f5dda | 499 | } |
523d27cd | 500 | fscache_note_page_release(afs_vnode_cache(vnode)); |
630f5dda DH |
501 | #endif |
502 | ||
78525c74 DH |
503 | if (folio_test_private(folio)) { |
504 | trace_afs_folio_dirty(vnode, tracepoint_string("rel"), folio); | |
505 | folio_detach_private(folio); | |
1da177e4 LT |
506 | } |
507 | ||
78525c74 | 508 | /* Indicate that the folio can be released */ |
9b3f26c9 | 509 | _leave(" = T"); |
78525c74 | 510 | return true; |
ec26815a | 511 | } |
1cf7a151 | 512 | |
6e0e99d5 DH |
513 | static void afs_add_open_mmap(struct afs_vnode *vnode) |
514 | { | |
515 | if (atomic_inc_return(&vnode->cb_nr_mmap) == 1) { | |
516 | down_write(&vnode->volume->cell->fs_open_mmaps_lock); | |
517 | ||
1744a22a DH |
518 | if (list_empty(&vnode->cb_mmap_link)) |
519 | list_add_tail(&vnode->cb_mmap_link, | |
520 | &vnode->volume->cell->fs_open_mmaps); | |
6e0e99d5 DH |
521 | |
522 | up_write(&vnode->volume->cell->fs_open_mmaps_lock); | |
523 | } | |
524 | } | |
525 | ||
526 | static void afs_drop_open_mmap(struct afs_vnode *vnode) | |
527 | { | |
528 | if (!atomic_dec_and_test(&vnode->cb_nr_mmap)) | |
529 | return; | |
530 | ||
531 | down_write(&vnode->volume->cell->fs_open_mmaps_lock); | |
532 | ||
533 | if (atomic_read(&vnode->cb_nr_mmap) == 0) | |
534 | list_del_init(&vnode->cb_mmap_link); | |
535 | ||
536 | up_write(&vnode->volume->cell->fs_open_mmaps_lock); | |
537 | flush_work(&vnode->cb_work); | |
538 | } | |
539 | ||
1cf7a151 DH |
540 | /* |
541 | * Handle setting up a memory mapping on an AFS file. | |
542 | */ | |
543 | static int afs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
544 | { | |
6e0e99d5 | 545 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); |
1cf7a151 DH |
546 | int ret; |
547 | ||
6e0e99d5 DH |
548 | afs_add_open_mmap(vnode); |
549 | ||
1cf7a151 DH |
550 | ret = generic_file_mmap(file, vma); |
551 | if (ret == 0) | |
552 | vma->vm_ops = &afs_vm_ops; | |
6e0e99d5 DH |
553 | else |
554 | afs_drop_open_mmap(vnode); | |
1cf7a151 DH |
555 | return ret; |
556 | } | |
3978d816 | 557 | |
6e0e99d5 DH |
558 | static void afs_vm_open(struct vm_area_struct *vma) |
559 | { | |
560 | afs_add_open_mmap(AFS_FS_I(file_inode(vma->vm_file))); | |
561 | } | |
562 | ||
563 | static void afs_vm_close(struct vm_area_struct *vma) | |
564 | { | |
565 | afs_drop_open_mmap(AFS_FS_I(file_inode(vma->vm_file))); | |
566 | } | |
567 | ||
568 | static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff) | |
569 | { | |
570 | struct afs_vnode *vnode = AFS_FS_I(file_inode(vmf->vma->vm_file)); | |
571 | struct afs_file *af = vmf->vma->vm_file->private_data; | |
572 | ||
573 | switch (afs_validate(vnode, af->key)) { | |
574 | case 0: | |
575 | return filemap_map_pages(vmf, start_pgoff, end_pgoff); | |
576 | case -ENOMEM: | |
577 | return VM_FAULT_OOM; | |
578 | case -EINTR: | |
579 | case -ERESTARTSYS: | |
580 | return VM_FAULT_RETRY; | |
581 | case -ESTALE: | |
582 | default: | |
583 | return VM_FAULT_SIGBUS; | |
584 | } | |
585 | } | |
586 | ||
3978d816 DH |
587 | static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) |
588 | { | |
589 | struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); | |
590 | struct afs_file *af = iocb->ki_filp->private_data; | |
591 | int ret; | |
592 | ||
593 | ret = afs_validate(vnode, af->key); | |
594 | if (ret < 0) | |
595 | return ret; | |
596 | ||
597 | return generic_file_read_iter(iocb, iter); | |
598 | } |