Commit | Line | Data |
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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 | 61 | .writepages = afs_writepages, |
a9eb558a | 62 | .migrate_folio = filemap_migrate_folio, |
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, |
a9eb558a | 69 | .migrate_folio = filemap_migrate_folio, |
75bd228d DH |
70 | }; |
71 | ||
1cf7a151 | 72 | static const struct vm_operations_struct afs_vm_ops = { |
6e0e99d5 DH |
73 | .open = afs_vm_open, |
74 | .close = afs_vm_close, | |
1cf7a151 | 75 | .fault = filemap_fault, |
6e0e99d5 | 76 | .map_pages = afs_vm_map_pages, |
1cf7a151 DH |
77 | .page_mkwrite = afs_page_mkwrite, |
78 | }; | |
79 | ||
4343d008 DH |
80 | /* |
81 | * Discard a pin on a writeback key. | |
82 | */ | |
83 | void afs_put_wb_key(struct afs_wb_key *wbk) | |
84 | { | |
e49c7b2f | 85 | if (wbk && refcount_dec_and_test(&wbk->usage)) { |
4343d008 DH |
86 | key_put(wbk->key); |
87 | kfree(wbk); | |
88 | } | |
89 | } | |
90 | ||
91 | /* | |
92 | * Cache key for writeback. | |
93 | */ | |
94 | int afs_cache_wb_key(struct afs_vnode *vnode, struct afs_file *af) | |
95 | { | |
96 | struct afs_wb_key *wbk, *p; | |
97 | ||
98 | wbk = kzalloc(sizeof(struct afs_wb_key), GFP_KERNEL); | |
99 | if (!wbk) | |
100 | return -ENOMEM; | |
101 | refcount_set(&wbk->usage, 2); | |
102 | wbk->key = af->key; | |
103 | ||
104 | spin_lock(&vnode->wb_lock); | |
105 | list_for_each_entry(p, &vnode->wb_keys, vnode_link) { | |
106 | if (p->key == wbk->key) | |
107 | goto found; | |
108 | } | |
109 | ||
110 | key_get(wbk->key); | |
111 | list_add_tail(&wbk->vnode_link, &vnode->wb_keys); | |
112 | spin_unlock(&vnode->wb_lock); | |
113 | af->wb = wbk; | |
114 | return 0; | |
115 | ||
116 | found: | |
117 | refcount_inc(&p->usage); | |
118 | spin_unlock(&vnode->wb_lock); | |
119 | af->wb = p; | |
120 | kfree(wbk); | |
121 | return 0; | |
122 | } | |
123 | ||
00d3b7a4 DH |
124 | /* |
125 | * open an AFS file or directory and attach a key to it | |
126 | */ | |
127 | int afs_open(struct inode *inode, struct file *file) | |
128 | { | |
129 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
215804a9 | 130 | struct afs_file *af; |
00d3b7a4 | 131 | struct key *key; |
260a9803 | 132 | int ret; |
00d3b7a4 | 133 | |
3b6492df | 134 | _enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode); |
00d3b7a4 DH |
135 | |
136 | key = afs_request_key(vnode->volume->cell); | |
137 | if (IS_ERR(key)) { | |
215804a9 DH |
138 | ret = PTR_ERR(key); |
139 | goto error; | |
00d3b7a4 DH |
140 | } |
141 | ||
215804a9 DH |
142 | af = kzalloc(sizeof(*af), GFP_KERNEL); |
143 | if (!af) { | |
144 | ret = -ENOMEM; | |
145 | goto error_key; | |
260a9803 | 146 | } |
4343d008 | 147 | af->key = key; |
260a9803 | 148 | |
215804a9 DH |
149 | ret = afs_validate(vnode, key); |
150 | if (ret < 0) | |
151 | goto error_af; | |
152 | ||
4343d008 DH |
153 | if (file->f_mode & FMODE_WRITE) { |
154 | ret = afs_cache_wb_key(vnode, af); | |
155 | if (ret < 0) | |
156 | goto error_af; | |
157 | } | |
5a813276 DH |
158 | |
159 | if (file->f_flags & O_TRUNC) | |
160 | set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); | |
523d27cd DH |
161 | |
162 | fscache_use_cookie(afs_vnode_cache(vnode), file->f_mode & FMODE_WRITE); | |
163 | ||
215804a9 | 164 | file->private_data = af; |
00d3b7a4 DH |
165 | _leave(" = 0"); |
166 | return 0; | |
215804a9 DH |
167 | |
168 | error_af: | |
169 | kfree(af); | |
170 | error_key: | |
171 | key_put(key); | |
172 | error: | |
173 | _leave(" = %d", ret); | |
174 | return ret; | |
00d3b7a4 DH |
175 | } |
176 | ||
177 | /* | |
178 | * release an AFS file or directory and discard its key | |
179 | */ | |
180 | int afs_release(struct inode *inode, struct file *file) | |
181 | { | |
523d27cd | 182 | struct afs_vnode_cache_aux aux; |
00d3b7a4 | 183 | struct afs_vnode *vnode = AFS_FS_I(inode); |
215804a9 | 184 | struct afs_file *af = file->private_data; |
523d27cd | 185 | loff_t i_size; |
a1b879ee | 186 | int ret = 0; |
00d3b7a4 | 187 | |
3b6492df | 188 | _enter("{%llx:%llu},", vnode->fid.vid, vnode->fid.vnode); |
00d3b7a4 | 189 | |
5a813276 | 190 | if ((file->f_mode & FMODE_WRITE)) |
a1b879ee | 191 | ret = vfs_fsync(file, 0); |
5a813276 | 192 | |
215804a9 | 193 | file->private_data = NULL; |
4343d008 DH |
194 | if (af->wb) |
195 | afs_put_wb_key(af->wb); | |
523d27cd DH |
196 | |
197 | if ((file->f_mode & FMODE_WRITE)) { | |
874c8ca1 | 198 | i_size = i_size_read(&vnode->netfs.inode); |
523d27cd DH |
199 | afs_set_cache_aux(vnode, &aux); |
200 | fscache_unuse_cookie(afs_vnode_cache(vnode), &aux, &i_size); | |
201 | } else { | |
202 | fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL); | |
203 | } | |
204 | ||
215804a9 DH |
205 | key_put(af->key); |
206 | kfree(af); | |
4343d008 | 207 | afs_prune_wb_keys(vnode); |
a1b879ee DH |
208 | _leave(" = %d", ret); |
209 | return ret; | |
00d3b7a4 DH |
210 | } |
211 | ||
c4508464 | 212 | /* |
5cbf0398 | 213 | * Allocate a new read record. |
c4508464 | 214 | */ |
5cbf0398 | 215 | struct afs_read *afs_alloc_read(gfp_t gfp) |
c4508464 | 216 | { |
5cbf0398 | 217 | struct afs_read *req; |
c4508464 | 218 | |
5cbf0398 DH |
219 | req = kzalloc(sizeof(struct afs_read), gfp); |
220 | if (req) | |
221 | refcount_set(&req->usage, 1); | |
c4508464 | 222 | |
5cbf0398 | 223 | return req; |
c4508464 DH |
224 | } |
225 | ||
196ee9cd DH |
226 | /* |
227 | * Dispose of a ref to a read record. | |
228 | */ | |
229 | void afs_put_read(struct afs_read *req) | |
230 | { | |
f3ddee8d | 231 | if (refcount_dec_and_test(&req->usage)) { |
c4508464 DH |
232 | if (req->cleanup) |
233 | req->cleanup(req); | |
c69bf479 | 234 | key_put(req->key); |
196ee9cd DH |
235 | kfree(req); |
236 | } | |
237 | } | |
238 | ||
dc419184 DH |
239 | static void afs_fetch_data_notify(struct afs_operation *op) |
240 | { | |
241 | struct afs_read *req = op->fetch.req; | |
6a19114b | 242 | struct netfs_io_subrequest *subreq = req->subreq; |
dc419184 DH |
243 | int error = op->error; |
244 | ||
245 | if (error == -ECONNABORTED) | |
246 | error = afs_abort_to_error(op->ac.abort_code); | |
247 | req->error = error; | |
248 | ||
5cbf0398 DH |
249 | if (subreq) { |
250 | __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); | |
251 | netfs_subreq_terminated(subreq, error ?: req->actual_len, false); | |
252 | req->subreq = NULL; | |
253 | } else if (req->done) { | |
dc419184 | 254 | req->done(req); |
5cbf0398 | 255 | } |
dc419184 DH |
256 | } |
257 | ||
e49c7b2f DH |
258 | static void afs_fetch_data_success(struct afs_operation *op) |
259 | { | |
260 | struct afs_vnode *vnode = op->file[0].vnode; | |
261 | ||
262 | _enter("op=%08x", op->debug_id); | |
e49c7b2f DH |
263 | afs_vnode_commit_status(op, &op->file[0]); |
264 | afs_stat_v(vnode, n_fetches); | |
265 | atomic_long_add(op->fetch.req->actual_len, &op->net->n_fetch_bytes); | |
dc419184 | 266 | afs_fetch_data_notify(op); |
e49c7b2f DH |
267 | } |
268 | ||
269 | static void afs_fetch_data_put(struct afs_operation *op) | |
270 | { | |
c4508464 | 271 | op->fetch.req->error = op->error; |
e49c7b2f DH |
272 | afs_put_read(op->fetch.req); |
273 | } | |
274 | ||
275 | static const struct afs_operation_ops afs_fetch_data_operation = { | |
276 | .issue_afs_rpc = afs_fs_fetch_data, | |
277 | .issue_yfs_rpc = yfs_fs_fetch_data, | |
278 | .success = afs_fetch_data_success, | |
728279a5 | 279 | .aborted = afs_check_for_remote_deletion, |
dc419184 | 280 | .failed = afs_fetch_data_notify, |
e49c7b2f DH |
281 | .put = afs_fetch_data_put, |
282 | }; | |
283 | ||
d2ddc776 DH |
284 | /* |
285 | * Fetch file data from the volume. | |
286 | */ | |
c69bf479 | 287 | int afs_fetch_data(struct afs_vnode *vnode, struct afs_read *req) |
d2ddc776 | 288 | { |
e49c7b2f | 289 | struct afs_operation *op; |
d2ddc776 | 290 | |
3b6492df | 291 | _enter("%s{%llx:%llu.%u},%x,,,", |
d2ddc776 DH |
292 | vnode->volume->name, |
293 | vnode->fid.vid, | |
294 | vnode->fid.vnode, | |
295 | vnode->fid.unique, | |
c69bf479 | 296 | key_serial(req->key)); |
d2ddc776 | 297 | |
c69bf479 | 298 | op = afs_alloc_operation(req->key, vnode->volume); |
5cbf0398 DH |
299 | if (IS_ERR(op)) { |
300 | if (req->subreq) | |
301 | netfs_subreq_terminated(req->subreq, PTR_ERR(op), false); | |
e49c7b2f | 302 | return PTR_ERR(op); |
5cbf0398 | 303 | } |
a58823ac | 304 | |
e49c7b2f | 305 | afs_op_set_vnode(op, 0, vnode); |
d2ddc776 | 306 | |
e49c7b2f DH |
307 | op->fetch.req = afs_get_read(req); |
308 | op->ops = &afs_fetch_data_operation; | |
309 | return afs_do_sync_operation(op); | |
d2ddc776 DH |
310 | } |
311 | ||
f18a3785 | 312 | static void afs_issue_read(struct netfs_io_subrequest *subreq) |
1da177e4 | 313 | { |
5cbf0398 DH |
314 | struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode); |
315 | struct afs_read *fsreq; | |
1da177e4 | 316 | |
5cbf0398 DH |
317 | fsreq = afs_alloc_read(GFP_NOFS); |
318 | if (!fsreq) | |
319 | return netfs_subreq_terminated(subreq, -ENOMEM, false); | |
1da177e4 | 320 | |
5cbf0398 DH |
321 | fsreq->subreq = subreq; |
322 | fsreq->pos = subreq->start + subreq->transferred; | |
323 | fsreq->len = subreq->len - subreq->transferred; | |
345e1ae0 | 324 | fsreq->key = key_get(subreq->rreq->netfs_priv); |
5cbf0398 DH |
325 | fsreq->vnode = vnode; |
326 | fsreq->iter = &fsreq->def_iter; | |
03ffae90 | 327 | |
de4eda9d | 328 | iov_iter_xarray(&fsreq->def_iter, ITER_DEST, |
874c8ca1 | 329 | &fsreq->vnode->netfs.inode.i_mapping->i_pages, |
5cbf0398 | 330 | fsreq->pos, fsreq->len); |
c4508464 | 331 | |
5cbf0398 | 332 | afs_fetch_data(fsreq->vnode, fsreq); |
345e1ae0 | 333 | afs_put_read(fsreq); |
ec26815a | 334 | } |
1da177e4 | 335 | |
d7e0f539 | 336 | static int afs_symlink_read_folio(struct file *file, struct folio *folio) |
f6d335c0 | 337 | { |
d7e0f539 | 338 | struct afs_vnode *vnode = AFS_FS_I(folio->mapping->host); |
5cbf0398 | 339 | struct afs_read *fsreq; |
f6d335c0 AV |
340 | int ret; |
341 | ||
5cbf0398 DH |
342 | fsreq = afs_alloc_read(GFP_NOFS); |
343 | if (!fsreq) | |
91b467e0 DH |
344 | return -ENOMEM; |
345 | ||
78525c74 DH |
346 | fsreq->pos = folio_pos(folio); |
347 | fsreq->len = folio_size(folio); | |
5cbf0398 DH |
348 | fsreq->vnode = vnode; |
349 | fsreq->iter = &fsreq->def_iter; | |
de4eda9d | 350 | iov_iter_xarray(&fsreq->def_iter, ITER_DEST, &folio->mapping->i_pages, |
5cbf0398 | 351 | fsreq->pos, fsreq->len); |
c4508464 | 352 | |
5cbf0398 | 353 | ret = afs_fetch_data(fsreq->vnode, fsreq); |
78525c74 | 354 | if (ret == 0) |
d7e0f539 MWO |
355 | folio_mark_uptodate(folio); |
356 | folio_unlock(folio); | |
5cbf0398 DH |
357 | return ret; |
358 | } | |
91b467e0 | 359 | |
2de16041 | 360 | static int afs_init_request(struct netfs_io_request *rreq, struct file *file) |
5cbf0398 DH |
361 | { |
362 | rreq->netfs_priv = key_get(afs_file_key(file)); | |
2de16041 | 363 | return 0; |
5cbf0398 | 364 | } |
91b467e0 | 365 | |
6a19114b | 366 | static int afs_begin_cache_operation(struct netfs_io_request *rreq) |
5cbf0398 | 367 | { |
2cee6fbb | 368 | #ifdef CONFIG_AFS_FSCACHE |
5cbf0398 | 369 | struct afs_vnode *vnode = AFS_FS_I(rreq->inode); |
91b467e0 | 370 | |
523d27cd DH |
371 | return fscache_begin_read_operation(&rreq->cache_resources, |
372 | afs_vnode_cache(vnode)); | |
2cee6fbb DH |
373 | #else |
374 | return -ENOBUFS; | |
375 | #endif | |
91b467e0 DH |
376 | } |
377 | ||
3003bbd0 | 378 | static int afs_check_write_begin(struct file *file, loff_t pos, unsigned len, |
fac47b43 | 379 | struct folio **foliop, void **_fsdata) |
3003bbd0 DH |
380 | { |
381 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); | |
382 | ||
383 | return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? -ESTALE : 0; | |
384 | } | |
385 | ||
40a81101 | 386 | static void afs_free_request(struct netfs_io_request *rreq) |
1da177e4 | 387 | { |
40a81101 | 388 | key_put(rreq->netfs_priv); |
5cbf0398 | 389 | } |
f6d335c0 | 390 | |
6a19114b DH |
391 | const struct netfs_request_ops afs_req_ops = { |
392 | .init_request = afs_init_request, | |
40a81101 | 393 | .free_request = afs_free_request, |
5cbf0398 | 394 | .begin_cache_operation = afs_begin_cache_operation, |
3003bbd0 | 395 | .check_write_begin = afs_check_write_begin, |
f18a3785 | 396 | .issue_read = afs_issue_read, |
5cbf0398 | 397 | }; |
1da177e4 | 398 | |
c7f75ef3 DH |
399 | int afs_write_inode(struct inode *inode, struct writeback_control *wbc) |
400 | { | |
401 | fscache_unpin_writeback(wbc, afs_vnode_cache(AFS_FS_I(inode))); | |
402 | return 0; | |
403 | } | |
404 | ||
f86726a6 DH |
405 | /* |
406 | * Adjust the dirty region of the page on truncation or full invalidation, | |
407 | * getting rid of the markers altogether if the region is entirely invalidated. | |
408 | */ | |
fcf227da MWO |
409 | static void afs_invalidate_dirty(struct folio *folio, size_t offset, |
410 | size_t length) | |
f86726a6 | 411 | { |
78525c74 | 412 | struct afs_vnode *vnode = AFS_FS_I(folio_inode(folio)); |
f86726a6 DH |
413 | unsigned long priv; |
414 | unsigned int f, t, end = offset + length; | |
415 | ||
78525c74 | 416 | priv = (unsigned long)folio_get_private(folio); |
f86726a6 DH |
417 | |
418 | /* we clean up only if the entire page is being invalidated */ | |
78525c74 | 419 | if (offset == 0 && length == folio_size(folio)) |
f86726a6 DH |
420 | goto full_invalidate; |
421 | ||
422 | /* If the page was dirtied by page_mkwrite(), the PTE stays writable | |
423 | * and we don't get another notification to tell us to expand it | |
424 | * again. | |
425 | */ | |
78525c74 | 426 | if (afs_is_folio_dirty_mmapped(priv)) |
f86726a6 DH |
427 | return; |
428 | ||
429 | /* We may need to shorten the dirty region */ | |
78525c74 DH |
430 | f = afs_folio_dirty_from(folio, priv); |
431 | t = afs_folio_dirty_to(folio, priv); | |
f86726a6 DH |
432 | |
433 | if (t <= offset || f >= end) | |
434 | return; /* Doesn't overlap */ | |
435 | ||
436 | if (f < offset && t > end) | |
437 | return; /* Splits the dirty region - just absorb it */ | |
438 | ||
439 | if (f >= offset && t <= end) | |
440 | goto undirty; | |
441 | ||
442 | if (f < offset) | |
443 | t = offset; | |
444 | else | |
445 | f = end; | |
446 | if (f == t) | |
447 | goto undirty; | |
448 | ||
78525c74 DH |
449 | priv = afs_folio_dirty(folio, f, t); |
450 | folio_change_private(folio, (void *)priv); | |
451 | trace_afs_folio_dirty(vnode, tracepoint_string("trunc"), folio); | |
f86726a6 DH |
452 | return; |
453 | ||
454 | undirty: | |
78525c74 DH |
455 | trace_afs_folio_dirty(vnode, tracepoint_string("undirty"), folio); |
456 | folio_clear_dirty_for_io(folio); | |
f86726a6 | 457 | full_invalidate: |
78525c74 DH |
458 | trace_afs_folio_dirty(vnode, tracepoint_string("inval"), folio); |
459 | folio_detach_private(folio); | |
f86726a6 DH |
460 | } |
461 | ||
1da177e4 | 462 | /* |
9b3f26c9 DH |
463 | * invalidate part or all of a page |
464 | * - release a page and clean up its private data if offset is 0 (indicating | |
465 | * the entire page) | |
466 | */ | |
fcf227da MWO |
467 | static void afs_invalidate_folio(struct folio *folio, size_t offset, |
468 | size_t length) | |
9b3f26c9 | 469 | { |
fcf227da | 470 | _enter("{%lu},%zu,%zu", folio->index, offset, length); |
9b3f26c9 | 471 | |
fcf227da | 472 | BUG_ON(!folio_test_locked(folio)); |
9b3f26c9 | 473 | |
fcf227da | 474 | if (folio_get_private(folio)) |
78525c74 | 475 | afs_invalidate_dirty(folio, offset, length); |
9b3f26c9 | 476 | |
78525c74 | 477 | folio_wait_fscache(folio); |
9b3f26c9 DH |
478 | _leave(""); |
479 | } | |
480 | ||
481 | /* | |
482 | * release a page and clean up its private state if it's not busy | |
483 | * - return true if the page can now be released, false if not | |
1da177e4 | 484 | */ |
508cae68 | 485 | static bool afs_release_folio(struct folio *folio, gfp_t gfp) |
1da177e4 | 486 | { |
78525c74 | 487 | struct afs_vnode *vnode = AFS_FS_I(folio_inode(folio)); |
1da177e4 | 488 | |
3b6492df | 489 | _enter("{{%llx:%llu}[%lu],%lx},%x", |
78525c74 | 490 | vnode->fid.vid, vnode->fid.vnode, folio_index(folio), folio->flags, |
523d27cd | 491 | gfp); |
1da177e4 | 492 | |
508cae68 | 493 | /* deny if folio is being written to the cache and the caller hasn't |
9b3f26c9 | 494 | * elected to wait */ |
630f5dda | 495 | #ifdef CONFIG_AFS_FSCACHE |
78525c74 | 496 | if (folio_test_fscache(folio)) { |
d7bdba1c | 497 | if (current_is_kswapd() || !(gfp & __GFP_FS)) |
630f5dda | 498 | return false; |
78525c74 | 499 | folio_wait_fscache(folio); |
630f5dda | 500 | } |
523d27cd | 501 | fscache_note_page_release(afs_vnode_cache(vnode)); |
630f5dda DH |
502 | #endif |
503 | ||
78525c74 DH |
504 | if (folio_test_private(folio)) { |
505 | trace_afs_folio_dirty(vnode, tracepoint_string("rel"), folio); | |
506 | folio_detach_private(folio); | |
1da177e4 LT |
507 | } |
508 | ||
78525c74 | 509 | /* Indicate that the folio can be released */ |
9b3f26c9 | 510 | _leave(" = T"); |
78525c74 | 511 | return true; |
ec26815a | 512 | } |
1cf7a151 | 513 | |
6e0e99d5 DH |
514 | static void afs_add_open_mmap(struct afs_vnode *vnode) |
515 | { | |
516 | if (atomic_inc_return(&vnode->cb_nr_mmap) == 1) { | |
517 | down_write(&vnode->volume->cell->fs_open_mmaps_lock); | |
518 | ||
1744a22a DH |
519 | if (list_empty(&vnode->cb_mmap_link)) |
520 | list_add_tail(&vnode->cb_mmap_link, | |
521 | &vnode->volume->cell->fs_open_mmaps); | |
6e0e99d5 DH |
522 | |
523 | up_write(&vnode->volume->cell->fs_open_mmaps_lock); | |
524 | } | |
525 | } | |
526 | ||
527 | static void afs_drop_open_mmap(struct afs_vnode *vnode) | |
528 | { | |
529 | if (!atomic_dec_and_test(&vnode->cb_nr_mmap)) | |
530 | return; | |
531 | ||
532 | down_write(&vnode->volume->cell->fs_open_mmaps_lock); | |
533 | ||
534 | if (atomic_read(&vnode->cb_nr_mmap) == 0) | |
535 | list_del_init(&vnode->cb_mmap_link); | |
536 | ||
537 | up_write(&vnode->volume->cell->fs_open_mmaps_lock); | |
538 | flush_work(&vnode->cb_work); | |
539 | } | |
540 | ||
1cf7a151 DH |
541 | /* |
542 | * Handle setting up a memory mapping on an AFS file. | |
543 | */ | |
544 | static int afs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
545 | { | |
6e0e99d5 | 546 | struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); |
1cf7a151 DH |
547 | int ret; |
548 | ||
6e0e99d5 DH |
549 | afs_add_open_mmap(vnode); |
550 | ||
1cf7a151 DH |
551 | ret = generic_file_mmap(file, vma); |
552 | if (ret == 0) | |
553 | vma->vm_ops = &afs_vm_ops; | |
6e0e99d5 DH |
554 | else |
555 | afs_drop_open_mmap(vnode); | |
1cf7a151 DH |
556 | return ret; |
557 | } | |
3978d816 | 558 | |
6e0e99d5 DH |
559 | static void afs_vm_open(struct vm_area_struct *vma) |
560 | { | |
561 | afs_add_open_mmap(AFS_FS_I(file_inode(vma->vm_file))); | |
562 | } | |
563 | ||
564 | static void afs_vm_close(struct vm_area_struct *vma) | |
565 | { | |
566 | afs_drop_open_mmap(AFS_FS_I(file_inode(vma->vm_file))); | |
567 | } | |
568 | ||
569 | static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff) | |
570 | { | |
571 | struct afs_vnode *vnode = AFS_FS_I(file_inode(vmf->vma->vm_file)); | |
572 | struct afs_file *af = vmf->vma->vm_file->private_data; | |
573 | ||
574 | switch (afs_validate(vnode, af->key)) { | |
575 | case 0: | |
576 | return filemap_map_pages(vmf, start_pgoff, end_pgoff); | |
577 | case -ENOMEM: | |
578 | return VM_FAULT_OOM; | |
579 | case -EINTR: | |
580 | case -ERESTARTSYS: | |
581 | return VM_FAULT_RETRY; | |
582 | case -ESTALE: | |
583 | default: | |
584 | return VM_FAULT_SIGBUS; | |
585 | } | |
586 | } | |
587 | ||
3978d816 DH |
588 | static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) |
589 | { | |
590 | struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); | |
591 | struct afs_file *af = iocb->ki_filp->private_data; | |
592 | int ret; | |
593 | ||
594 | ret = afs_validate(vnode, af->key); | |
595 | if (ret < 0) | |
596 | return ret; | |
597 | ||
598 | return generic_file_read_iter(iocb, iter); | |
599 | } |