]>
Commit | Line | Data |
---|---|---|
b6aeaded MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
b6aeaded MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/kernel.h> | |
e8edc6e0 | 14 | #include <linux/sched.h> |
7a36094d | 15 | #include <linux/sched/signal.h> |
08cbf542 | 16 | #include <linux/module.h> |
d9d318d3 | 17 | #include <linux/compat.h> |
478e0841 | 18 | #include <linux/swap.h> |
3634a632 | 19 | #include <linux/falloc.h> |
e2e40f2c | 20 | #include <linux/uio.h> |
b6aeaded | 21 | |
7213394c MS |
22 | static struct page **fuse_pages_alloc(unsigned int npages, gfp_t flags, |
23 | struct fuse_page_desc **desc) | |
4c4f03f7 MS |
24 | { |
25 | struct page **pages; | |
26 | ||
27 | pages = kzalloc(npages * (sizeof(struct page *) + | |
28 | sizeof(struct fuse_page_desc)), flags); | |
29 | *desc = (void *) (pages + npages); | |
30 | ||
31 | return pages; | |
32 | } | |
33 | ||
91fe96b4 MS |
34 | static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
35 | int opcode, struct fuse_open_out *outargp) | |
b6aeaded | 36 | { |
b6aeaded | 37 | struct fuse_open_in inarg; |
7078187a | 38 | FUSE_ARGS(args); |
fd72faac MS |
39 | |
40 | memset(&inarg, 0, sizeof(inarg)); | |
6ff958ed MS |
41 | inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY); |
42 | if (!fc->atomic_o_trunc) | |
43 | inarg.flags &= ~O_TRUNC; | |
d5b48543 MS |
44 | args.opcode = opcode; |
45 | args.nodeid = nodeid; | |
46 | args.in_numargs = 1; | |
47 | args.in_args[0].size = sizeof(inarg); | |
48 | args.in_args[0].value = &inarg; | |
49 | args.out_numargs = 1; | |
50 | args.out_args[0].size = sizeof(*outargp); | |
51 | args.out_args[0].value = outargp; | |
fd72faac | 52 | |
7078187a | 53 | return fuse_simple_request(fc, &args); |
fd72faac MS |
54 | } |
55 | ||
4cb54866 MS |
56 | struct fuse_release_args { |
57 | struct fuse_args args; | |
58 | struct fuse_release_in inarg; | |
59 | struct inode *inode; | |
60 | }; | |
61 | ||
acf99433 | 62 | struct fuse_file *fuse_file_alloc(struct fuse_conn *fc) |
fd72faac MS |
63 | { |
64 | struct fuse_file *ff; | |
6b2db28a | 65 | |
dc69e98c | 66 | ff = kzalloc(sizeof(struct fuse_file), GFP_KERNEL_ACCOUNT); |
6b2db28a TH |
67 | if (unlikely(!ff)) |
68 | return NULL; | |
69 | ||
da5e4714 | 70 | ff->fc = fc; |
dc69e98c KK |
71 | ff->release_args = kzalloc(sizeof(*ff->release_args), |
72 | GFP_KERNEL_ACCOUNT); | |
4cb54866 | 73 | if (!ff->release_args) { |
6b2db28a TH |
74 | kfree(ff); |
75 | return NULL; | |
fd72faac | 76 | } |
6b2db28a TH |
77 | |
78 | INIT_LIST_HEAD(&ff->write_entry); | |
5d7bc7e8 | 79 | mutex_init(&ff->readdir.lock); |
4e8c2eb5 | 80 | refcount_set(&ff->count, 1); |
6b2db28a TH |
81 | RB_CLEAR_NODE(&ff->polled_node); |
82 | init_waitqueue_head(&ff->poll_wait); | |
83 | ||
75126f55 | 84 | ff->kh = atomic64_inc_return(&fc->khctr); |
6b2db28a | 85 | |
fd72faac MS |
86 | return ff; |
87 | } | |
88 | ||
89 | void fuse_file_free(struct fuse_file *ff) | |
90 | { | |
4cb54866 | 91 | kfree(ff->release_args); |
5d7bc7e8 | 92 | mutex_destroy(&ff->readdir.lock); |
fd72faac MS |
93 | kfree(ff); |
94 | } | |
95 | ||
267d8444 | 96 | static struct fuse_file *fuse_file_get(struct fuse_file *ff) |
c756e0a4 | 97 | { |
4e8c2eb5 | 98 | refcount_inc(&ff->count); |
c756e0a4 MS |
99 | return ff; |
100 | } | |
101 | ||
4cb54866 MS |
102 | static void fuse_release_end(struct fuse_conn *fc, struct fuse_args *args, |
103 | int error) | |
819c4b3b | 104 | { |
4cb54866 MS |
105 | struct fuse_release_args *ra = container_of(args, typeof(*ra), args); |
106 | ||
107 | iput(ra->inode); | |
108 | kfree(ra); | |
819c4b3b MS |
109 | } |
110 | ||
2e64ff15 | 111 | static void fuse_file_put(struct fuse_file *ff, bool sync, bool isdir) |
c756e0a4 | 112 | { |
4e8c2eb5 | 113 | if (refcount_dec_and_test(&ff->count)) { |
4cb54866 | 114 | struct fuse_args *args = &ff->release_args->args; |
8b0797a4 | 115 | |
d9a9ea94 | 116 | if (isdir ? ff->fc->no_opendir : ff->fc->no_open) { |
4cb54866 MS |
117 | /* Do nothing when client does not implement 'open' */ |
118 | fuse_release_end(ff->fc, args, 0); | |
7678ac50 | 119 | } else if (sync) { |
4cb54866 MS |
120 | fuse_simple_request(ff->fc, args); |
121 | fuse_release_end(ff->fc, args, 0); | |
5a18ec17 | 122 | } else { |
4cb54866 MS |
123 | args->end = fuse_release_end; |
124 | if (fuse_simple_background(ff->fc, args, | |
125 | GFP_KERNEL | __GFP_NOFAIL)) | |
126 | fuse_release_end(ff->fc, args, -ENOTCONN); | |
5a18ec17 | 127 | } |
c756e0a4 MS |
128 | kfree(ff); |
129 | } | |
130 | } | |
131 | ||
08cbf542 TH |
132 | int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
133 | bool isdir) | |
91fe96b4 | 134 | { |
91fe96b4 | 135 | struct fuse_file *ff; |
91fe96b4 MS |
136 | int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; |
137 | ||
138 | ff = fuse_file_alloc(fc); | |
139 | if (!ff) | |
140 | return -ENOMEM; | |
141 | ||
7678ac50 | 142 | ff->fh = 0; |
fabf7e02 CA |
143 | /* Default for no-open */ |
144 | ff->open_flags = FOPEN_KEEP_CACHE | (isdir ? FOPEN_CACHE_DIR : 0); | |
d9a9ea94 | 145 | if (isdir ? !fc->no_opendir : !fc->no_open) { |
7678ac50 AG |
146 | struct fuse_open_out outarg; |
147 | int err; | |
148 | ||
149 | err = fuse_send_open(fc, nodeid, file, opcode, &outarg); | |
150 | if (!err) { | |
151 | ff->fh = outarg.fh; | |
152 | ff->open_flags = outarg.open_flags; | |
153 | ||
d9a9ea94 | 154 | } else if (err != -ENOSYS) { |
7678ac50 AG |
155 | fuse_file_free(ff); |
156 | return err; | |
157 | } else { | |
d9a9ea94 CA |
158 | if (isdir) |
159 | fc->no_opendir = 1; | |
160 | else | |
161 | fc->no_open = 1; | |
7678ac50 | 162 | } |
91fe96b4 MS |
163 | } |
164 | ||
165 | if (isdir) | |
7678ac50 | 166 | ff->open_flags &= ~FOPEN_DIRECT_IO; |
91fe96b4 | 167 | |
91fe96b4 | 168 | ff->nodeid = nodeid; |
267d8444 | 169 | file->private_data = ff; |
91fe96b4 MS |
170 | |
171 | return 0; | |
172 | } | |
08cbf542 | 173 | EXPORT_SYMBOL_GPL(fuse_do_open); |
91fe96b4 | 174 | |
650b22b9 PE |
175 | static void fuse_link_write_file(struct file *file) |
176 | { | |
177 | struct inode *inode = file_inode(file); | |
650b22b9 PE |
178 | struct fuse_inode *fi = get_fuse_inode(inode); |
179 | struct fuse_file *ff = file->private_data; | |
180 | /* | |
181 | * file may be written through mmap, so chain it onto the | |
182 | * inodes's write_file list | |
183 | */ | |
f15ecfef | 184 | spin_lock(&fi->lock); |
650b22b9 PE |
185 | if (list_empty(&ff->write_entry)) |
186 | list_add(&ff->write_entry, &fi->write_files); | |
f15ecfef | 187 | spin_unlock(&fi->lock); |
650b22b9 PE |
188 | } |
189 | ||
c7b7143c | 190 | void fuse_finish_open(struct inode *inode, struct file *file) |
fd72faac | 191 | { |
c7b7143c | 192 | struct fuse_file *ff = file->private_data; |
a0822c55 | 193 | struct fuse_conn *fc = get_fuse_conn(inode); |
c7b7143c | 194 | |
c7b7143c | 195 | if (!(ff->open_flags & FOPEN_KEEP_CACHE)) |
b1009979 | 196 | invalidate_inode_pages2(inode->i_mapping); |
bbd84f33 KS |
197 | if (ff->open_flags & FOPEN_STREAM) |
198 | stream_open(inode, file); | |
199 | else if (ff->open_flags & FOPEN_NONSEEKABLE) | |
a7c1b990 | 200 | nonseekable_open(inode, file); |
a0822c55 KS |
201 | if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) { |
202 | struct fuse_inode *fi = get_fuse_inode(inode); | |
203 | ||
f15ecfef | 204 | spin_lock(&fi->lock); |
4510d86f | 205 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
a0822c55 | 206 | i_size_write(inode, 0); |
f15ecfef | 207 | spin_unlock(&fi->lock); |
a0822c55 | 208 | fuse_invalidate_attr(inode); |
75caeecd MP |
209 | if (fc->writeback_cache) |
210 | file_update_time(file); | |
a0822c55 | 211 | } |
4d99ff8f PE |
212 | if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache) |
213 | fuse_link_write_file(file); | |
fd72faac MS |
214 | } |
215 | ||
91fe96b4 | 216 | int fuse_open_common(struct inode *inode, struct file *file, bool isdir) |
fd72faac | 217 | { |
acf99433 | 218 | struct fuse_conn *fc = get_fuse_conn(inode); |
b6aeaded | 219 | int err; |
e4648309 | 220 | bool is_wb_truncate = (file->f_flags & O_TRUNC) && |
75caeecd MP |
221 | fc->atomic_o_trunc && |
222 | fc->writeback_cache; | |
b6aeaded MS |
223 | |
224 | err = generic_file_open(inode, file); | |
225 | if (err) | |
226 | return err; | |
227 | ||
e4648309 | 228 | if (is_wb_truncate) { |
5955102c | 229 | inode_lock(inode); |
e4648309 MS |
230 | fuse_set_nowrite(inode); |
231 | } | |
75caeecd | 232 | |
91fe96b4 | 233 | err = fuse_do_open(fc, get_node_id(inode), file, isdir); |
b6aeaded | 234 | |
75caeecd MP |
235 | if (!err) |
236 | fuse_finish_open(inode, file); | |
91fe96b4 | 237 | |
e4648309 MS |
238 | if (is_wb_truncate) { |
239 | fuse_release_nowrite(inode); | |
5955102c | 240 | inode_unlock(inode); |
e4648309 | 241 | } |
75caeecd MP |
242 | |
243 | return err; | |
b6aeaded MS |
244 | } |
245 | ||
ebf84d0c KT |
246 | static void fuse_prepare_release(struct fuse_inode *fi, struct fuse_file *ff, |
247 | int flags, int opcode) | |
64c6d8ed | 248 | { |
8b0797a4 | 249 | struct fuse_conn *fc = ff->fc; |
4cb54866 | 250 | struct fuse_release_args *ra = ff->release_args; |
b6aeaded | 251 | |
f15ecfef KT |
252 | /* Inode is NULL on error path of fuse_create_open() */ |
253 | if (likely(fi)) { | |
254 | spin_lock(&fi->lock); | |
255 | list_del(&ff->write_entry); | |
256 | spin_unlock(&fi->lock); | |
257 | } | |
8b0797a4 | 258 | spin_lock(&fc->lock); |
8b0797a4 MS |
259 | if (!RB_EMPTY_NODE(&ff->polled_node)) |
260 | rb_erase(&ff->polled_node, &fc->polled_files); | |
261 | spin_unlock(&fc->lock); | |
262 | ||
357ccf2b | 263 | wake_up_interruptible_all(&ff->poll_wait); |
8b0797a4 | 264 | |
4cb54866 MS |
265 | ra->inarg.fh = ff->fh; |
266 | ra->inarg.flags = flags; | |
267 | ra->args.in_numargs = 1; | |
268 | ra->args.in_args[0].size = sizeof(struct fuse_release_in); | |
269 | ra->args.in_args[0].value = &ra->inarg; | |
270 | ra->args.opcode = opcode; | |
271 | ra->args.nodeid = ff->nodeid; | |
272 | ra->args.force = true; | |
273 | ra->args.nocreds = true; | |
fd72faac MS |
274 | } |
275 | ||
2e64ff15 | 276 | void fuse_release_common(struct file *file, bool isdir) |
fd72faac | 277 | { |
ebf84d0c | 278 | struct fuse_inode *fi = get_fuse_inode(file_inode(file)); |
9a87ad3d | 279 | struct fuse_file *ff = file->private_data; |
4cb54866 | 280 | struct fuse_release_args *ra = ff->release_args; |
2e64ff15 | 281 | int opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE; |
6b2db28a | 282 | |
ebf84d0c | 283 | fuse_prepare_release(fi, ff, file->f_flags, opcode); |
6b2db28a | 284 | |
37fb3a30 | 285 | if (ff->flock) { |
4cb54866 MS |
286 | ra->inarg.release_flags |= FUSE_RELEASE_FLOCK_UNLOCK; |
287 | ra->inarg.lock_owner = fuse_lock_owner_id(ff->fc, | |
288 | (fl_owner_t) file); | |
37fb3a30 | 289 | } |
baebccbe | 290 | /* Hold inode until release is finished */ |
4cb54866 | 291 | ra->inode = igrab(file_inode(file)); |
6b2db28a | 292 | |
6b2db28a TH |
293 | /* |
294 | * Normally this will send the RELEASE request, however if | |
295 | * some asynchronous READ or WRITE requests are outstanding, | |
296 | * the sending will be delayed. | |
5a18ec17 MS |
297 | * |
298 | * Make the release synchronous if this is a fuseblk mount, | |
299 | * synchronous RELEASE is allowed (and desirable) in this case | |
300 | * because the server can be trusted not to screw up. | |
6b2db28a | 301 | */ |
1ccd1ea2 | 302 | fuse_file_put(ff, ff->fc->destroy, isdir); |
b6aeaded MS |
303 | } |
304 | ||
04730fef MS |
305 | static int fuse_open(struct inode *inode, struct file *file) |
306 | { | |
91fe96b4 | 307 | return fuse_open_common(inode, file, false); |
04730fef MS |
308 | } |
309 | ||
310 | static int fuse_release(struct inode *inode, struct file *file) | |
311 | { | |
e7cc133c PE |
312 | struct fuse_conn *fc = get_fuse_conn(inode); |
313 | ||
314 | /* see fuse_vma_close() for !writeback_cache case */ | |
315 | if (fc->writeback_cache) | |
1e18bda8 | 316 | write_inode_now(inode, 1); |
b0aa7606 | 317 | |
2e64ff15 | 318 | fuse_release_common(file, false); |
8b0797a4 MS |
319 | |
320 | /* return value is ignored by VFS */ | |
321 | return 0; | |
322 | } | |
323 | ||
ebf84d0c | 324 | void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff, int flags) |
8b0797a4 | 325 | { |
4e8c2eb5 | 326 | WARN_ON(refcount_read(&ff->count) > 1); |
ebf84d0c | 327 | fuse_prepare_release(fi, ff, flags, FUSE_RELEASE); |
267d8444 MS |
328 | /* |
329 | * iput(NULL) is a no-op and since the refcount is 1 and everything's | |
330 | * synchronous, we are fine with not doing igrab() here" | |
331 | */ | |
2e64ff15 | 332 | fuse_file_put(ff, true, false); |
04730fef | 333 | } |
08cbf542 | 334 | EXPORT_SYMBOL_GPL(fuse_sync_release); |
04730fef | 335 | |
71421259 | 336 | /* |
9c8ef561 MS |
337 | * Scramble the ID space with XTEA, so that the value of the files_struct |
338 | * pointer is not exposed to userspace. | |
71421259 | 339 | */ |
f3332114 | 340 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 341 | { |
9c8ef561 MS |
342 | u32 *k = fc->scramble_key; |
343 | u64 v = (unsigned long) id; | |
344 | u32 v0 = v; | |
345 | u32 v1 = v >> 32; | |
346 | u32 sum = 0; | |
347 | int i; | |
348 | ||
349 | for (i = 0; i < 32; i++) { | |
350 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
351 | sum += 0x9E3779B9; | |
352 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
353 | } | |
354 | ||
355 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
356 | } |
357 | ||
33826ebb MS |
358 | struct fuse_writepage_args { |
359 | struct fuse_io_args ia; | |
360 | struct list_head writepages_entry; | |
361 | struct list_head queue_entry; | |
362 | struct fuse_writepage_args *next; | |
363 | struct inode *inode; | |
364 | }; | |
365 | ||
366 | static struct fuse_writepage_args *fuse_find_writeback(struct fuse_inode *fi, | |
2fe93bd4 MS |
367 | pgoff_t idx_from, pgoff_t idx_to) |
368 | { | |
33826ebb | 369 | struct fuse_writepage_args *wpa; |
2fe93bd4 | 370 | |
33826ebb | 371 | list_for_each_entry(wpa, &fi->writepages, writepages_entry) { |
2fe93bd4 MS |
372 | pgoff_t curr_index; |
373 | ||
33826ebb MS |
374 | WARN_ON(get_fuse_inode(wpa->inode) != fi); |
375 | curr_index = wpa->ia.write.in.offset >> PAGE_SHIFT; | |
376 | if (idx_from < curr_index + wpa->ia.ap.num_pages && | |
2fe93bd4 | 377 | curr_index <= idx_to) { |
33826ebb | 378 | return wpa; |
2fe93bd4 MS |
379 | } |
380 | } | |
381 | return NULL; | |
382 | } | |
383 | ||
3be5a52b | 384 | /* |
ea8cd333 | 385 | * Check if any page in a range is under writeback |
3be5a52b MS |
386 | * |
387 | * This is currently done by walking the list of writepage requests | |
388 | * for the inode, which can be pretty inefficient. | |
389 | */ | |
ea8cd333 PE |
390 | static bool fuse_range_is_writeback(struct inode *inode, pgoff_t idx_from, |
391 | pgoff_t idx_to) | |
3be5a52b | 392 | { |
3be5a52b | 393 | struct fuse_inode *fi = get_fuse_inode(inode); |
2fe93bd4 | 394 | bool found; |
3be5a52b | 395 | |
f15ecfef | 396 | spin_lock(&fi->lock); |
2fe93bd4 | 397 | found = fuse_find_writeback(fi, idx_from, idx_to); |
f15ecfef | 398 | spin_unlock(&fi->lock); |
3be5a52b MS |
399 | |
400 | return found; | |
401 | } | |
402 | ||
ea8cd333 PE |
403 | static inline bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) |
404 | { | |
405 | return fuse_range_is_writeback(inode, index, index); | |
406 | } | |
407 | ||
3be5a52b MS |
408 | /* |
409 | * Wait for page writeback to be completed. | |
410 | * | |
411 | * Since fuse doesn't rely on the VM writeback tracking, this has to | |
412 | * use some other means. | |
413 | */ | |
17b2cbe2 | 414 | static void fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) |
3be5a52b MS |
415 | { |
416 | struct fuse_inode *fi = get_fuse_inode(inode); | |
417 | ||
418 | wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); | |
3be5a52b MS |
419 | } |
420 | ||
fe38d7df MP |
421 | /* |
422 | * Wait for all pending writepages on the inode to finish. | |
423 | * | |
424 | * This is currently done by blocking further writes with FUSE_NOWRITE | |
425 | * and waiting for all sent writes to complete. | |
426 | * | |
427 | * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage | |
428 | * could conflict with truncation. | |
429 | */ | |
430 | static void fuse_sync_writes(struct inode *inode) | |
431 | { | |
432 | fuse_set_nowrite(inode); | |
433 | fuse_release_nowrite(inode); | |
434 | } | |
435 | ||
75e1fcc0 | 436 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 437 | { |
6131ffaa | 438 | struct inode *inode = file_inode(file); |
b6aeaded MS |
439 | struct fuse_conn *fc = get_fuse_conn(inode); |
440 | struct fuse_file *ff = file->private_data; | |
b6aeaded | 441 | struct fuse_flush_in inarg; |
c500ebaa | 442 | FUSE_ARGS(args); |
b6aeaded MS |
443 | int err; |
444 | ||
248d86e8 MS |
445 | if (is_bad_inode(inode)) |
446 | return -EIO; | |
447 | ||
b6aeaded MS |
448 | if (fc->no_flush) |
449 | return 0; | |
450 | ||
1e18bda8 | 451 | err = write_inode_now(inode, 1); |
fe38d7df MP |
452 | if (err) |
453 | return err; | |
454 | ||
5955102c | 455 | inode_lock(inode); |
fe38d7df | 456 | fuse_sync_writes(inode); |
5955102c | 457 | inode_unlock(inode); |
fe38d7df | 458 | |
4a7f4e88 | 459 | err = filemap_check_errors(file->f_mapping); |
9ebce595 MP |
460 | if (err) |
461 | return err; | |
462 | ||
b6aeaded MS |
463 | memset(&inarg, 0, sizeof(inarg)); |
464 | inarg.fh = ff->fh; | |
9c8ef561 | 465 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
c500ebaa MS |
466 | args.opcode = FUSE_FLUSH; |
467 | args.nodeid = get_node_id(inode); | |
468 | args.in_numargs = 1; | |
469 | args.in_args[0].size = sizeof(inarg); | |
470 | args.in_args[0].value = &inarg; | |
471 | args.force = true; | |
472 | ||
473 | err = fuse_simple_request(fc, &args); | |
b6aeaded MS |
474 | if (err == -ENOSYS) { |
475 | fc->no_flush = 1; | |
476 | err = 0; | |
477 | } | |
478 | return err; | |
479 | } | |
480 | ||
02c24a82 | 481 | int fuse_fsync_common(struct file *file, loff_t start, loff_t end, |
a9c2d1e8 | 482 | int datasync, int opcode) |
b6aeaded | 483 | { |
7ea80859 | 484 | struct inode *inode = file->f_mapping->host; |
b6aeaded MS |
485 | struct fuse_conn *fc = get_fuse_conn(inode); |
486 | struct fuse_file *ff = file->private_data; | |
7078187a | 487 | FUSE_ARGS(args); |
b6aeaded | 488 | struct fuse_fsync_in inarg; |
a9c2d1e8 MS |
489 | |
490 | memset(&inarg, 0, sizeof(inarg)); | |
491 | inarg.fh = ff->fh; | |
154603fe | 492 | inarg.fsync_flags = datasync ? FUSE_FSYNC_FDATASYNC : 0; |
d5b48543 MS |
493 | args.opcode = opcode; |
494 | args.nodeid = get_node_id(inode); | |
495 | args.in_numargs = 1; | |
496 | args.in_args[0].size = sizeof(inarg); | |
497 | args.in_args[0].value = &inarg; | |
a9c2d1e8 MS |
498 | return fuse_simple_request(fc, &args); |
499 | } | |
500 | ||
501 | static int fuse_fsync(struct file *file, loff_t start, loff_t end, | |
502 | int datasync) | |
503 | { | |
504 | struct inode *inode = file->f_mapping->host; | |
505 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b6aeaded MS |
506 | int err; |
507 | ||
248d86e8 MS |
508 | if (is_bad_inode(inode)) |
509 | return -EIO; | |
510 | ||
5955102c | 511 | inode_lock(inode); |
02c24a82 | 512 | |
3be5a52b MS |
513 | /* |
514 | * Start writeback against all dirty pages of the inode, then | |
515 | * wait for all outstanding writes, before sending the FSYNC | |
516 | * request. | |
517 | */ | |
7e51fe1d | 518 | err = file_write_and_wait_range(file, start, end); |
3be5a52b | 519 | if (err) |
02c24a82 | 520 | goto out; |
3be5a52b MS |
521 | |
522 | fuse_sync_writes(inode); | |
ac7f052b AK |
523 | |
524 | /* | |
525 | * Due to implementation of fuse writeback | |
7e51fe1d | 526 | * file_write_and_wait_range() does not catch errors. |
ac7f052b AK |
527 | * We have to do this directly after fuse_sync_writes() |
528 | */ | |
7e51fe1d | 529 | err = file_check_and_advance_wb_err(file); |
ac7f052b AK |
530 | if (err) |
531 | goto out; | |
532 | ||
1e18bda8 MS |
533 | err = sync_inode_metadata(inode, 1); |
534 | if (err) | |
535 | goto out; | |
3be5a52b | 536 | |
a9c2d1e8 | 537 | if (fc->no_fsync) |
22401e7b | 538 | goto out; |
b0aa7606 | 539 | |
a9c2d1e8 | 540 | err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNC); |
b6aeaded | 541 | if (err == -ENOSYS) { |
a9c2d1e8 | 542 | fc->no_fsync = 1; |
b6aeaded MS |
543 | err = 0; |
544 | } | |
02c24a82 | 545 | out: |
5955102c | 546 | inode_unlock(inode); |
b6aeaded | 547 | |
a9c2d1e8 | 548 | return err; |
82547981 MS |
549 | } |
550 | ||
00793ca5 MS |
551 | void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos, |
552 | size_t count, int opcode) | |
553 | { | |
554 | struct fuse_file *ff = file->private_data; | |
555 | struct fuse_args *args = &ia->ap.args; | |
556 | ||
557 | ia->read.in.fh = ff->fh; | |
558 | ia->read.in.offset = pos; | |
559 | ia->read.in.size = count; | |
560 | ia->read.in.flags = file->f_flags; | |
561 | args->opcode = opcode; | |
562 | args->nodeid = ff->nodeid; | |
563 | args->in_numargs = 1; | |
564 | args->in_args[0].size = sizeof(ia->read.in); | |
565 | args->in_args[0].value = &ia->read.in; | |
566 | args->out_argvar = true; | |
567 | args->out_numargs = 1; | |
568 | args->out_args[0].size = count; | |
569 | } | |
570 | ||
45ac96ed MS |
571 | static void fuse_release_user_pages(struct fuse_args_pages *ap, |
572 | bool should_dirty) | |
187c5c36 | 573 | { |
45ac96ed | 574 | unsigned int i; |
187c5c36 | 575 | |
45ac96ed | 576 | for (i = 0; i < ap->num_pages; i++) { |
8fba54ae | 577 | if (should_dirty) |
45ac96ed MS |
578 | set_page_dirty_lock(ap->pages[i]); |
579 | put_page(ap->pages[i]); | |
187c5c36 MP |
580 | } |
581 | } | |
582 | ||
744742d6 SF |
583 | static void fuse_io_release(struct kref *kref) |
584 | { | |
585 | kfree(container_of(kref, struct fuse_io_priv, refcnt)); | |
586 | } | |
587 | ||
9d5722b7 CH |
588 | static ssize_t fuse_get_res_by_io(struct fuse_io_priv *io) |
589 | { | |
590 | if (io->err) | |
591 | return io->err; | |
592 | ||
593 | if (io->bytes >= 0 && io->write) | |
594 | return -EIO; | |
595 | ||
596 | return io->bytes < 0 ? io->size : io->bytes; | |
597 | } | |
598 | ||
01e9d11a MP |
599 | /** |
600 | * In case of short read, the caller sets 'pos' to the position of | |
601 | * actual end of fuse request in IO request. Otherwise, if bytes_requested | |
602 | * == bytes_transferred or rw == WRITE, the caller sets 'pos' to -1. | |
603 | * | |
604 | * An example: | |
605 | * User requested DIO read of 64K. It was splitted into two 32K fuse requests, | |
606 | * both submitted asynchronously. The first of them was ACKed by userspace as | |
607 | * fully completed (req->out.args[0].size == 32K) resulting in pos == -1. The | |
608 | * second request was ACKed as short, e.g. only 1K was read, resulting in | |
609 | * pos == 33K. | |
610 | * | |
611 | * Thus, when all fuse requests are completed, the minimal non-negative 'pos' | |
612 | * will be equal to the length of the longest contiguous fragment of | |
613 | * transferred data starting from the beginning of IO request. | |
614 | */ | |
615 | static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos) | |
616 | { | |
617 | int left; | |
618 | ||
619 | spin_lock(&io->lock); | |
620 | if (err) | |
621 | io->err = io->err ? : err; | |
622 | else if (pos >= 0 && (io->bytes < 0 || pos < io->bytes)) | |
623 | io->bytes = pos; | |
624 | ||
625 | left = --io->reqs; | |
7879c4e5 | 626 | if (!left && io->blocking) |
9d5722b7 | 627 | complete(io->done); |
01e9d11a MP |
628 | spin_unlock(&io->lock); |
629 | ||
7879c4e5 | 630 | if (!left && !io->blocking) { |
9d5722b7 | 631 | ssize_t res = fuse_get_res_by_io(io); |
01e9d11a | 632 | |
9d5722b7 CH |
633 | if (res >= 0) { |
634 | struct inode *inode = file_inode(io->iocb->ki_filp); | |
635 | struct fuse_conn *fc = get_fuse_conn(inode); | |
636 | struct fuse_inode *fi = get_fuse_inode(inode); | |
01e9d11a | 637 | |
f15ecfef | 638 | spin_lock(&fi->lock); |
4510d86f | 639 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
f15ecfef | 640 | spin_unlock(&fi->lock); |
01e9d11a MP |
641 | } |
642 | ||
04b2fa9f | 643 | io->iocb->ki_complete(io->iocb, res, 0); |
01e9d11a | 644 | } |
744742d6 SF |
645 | |
646 | kref_put(&io->refcnt, fuse_io_release); | |
01e9d11a MP |
647 | } |
648 | ||
45ac96ed MS |
649 | static struct fuse_io_args *fuse_io_alloc(struct fuse_io_priv *io, |
650 | unsigned int npages) | |
651 | { | |
652 | struct fuse_io_args *ia; | |
653 | ||
654 | ia = kzalloc(sizeof(*ia), GFP_KERNEL); | |
655 | if (ia) { | |
656 | ia->io = io; | |
657 | ia->ap.pages = fuse_pages_alloc(npages, GFP_KERNEL, | |
658 | &ia->ap.descs); | |
659 | if (!ia->ap.pages) { | |
660 | kfree(ia); | |
661 | ia = NULL; | |
662 | } | |
663 | } | |
664 | return ia; | |
665 | } | |
666 | ||
667 | static void fuse_io_free(struct fuse_io_args *ia) | |
01e9d11a | 668 | { |
45ac96ed MS |
669 | kfree(ia->ap.pages); |
670 | kfree(ia); | |
671 | } | |
672 | ||
673 | static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_args *args, | |
674 | int err) | |
675 | { | |
676 | struct fuse_io_args *ia = container_of(args, typeof(*ia), ap.args); | |
677 | struct fuse_io_priv *io = ia->io; | |
01e9d11a MP |
678 | ssize_t pos = -1; |
679 | ||
45ac96ed | 680 | fuse_release_user_pages(&ia->ap, io->should_dirty); |
01e9d11a | 681 | |
45ac96ed MS |
682 | if (err) { |
683 | /* Nothing */ | |
684 | } else if (io->write) { | |
685 | if (ia->write.out.size > ia->write.in.size) { | |
686 | err = -EIO; | |
687 | } else if (ia->write.in.size != ia->write.out.size) { | |
688 | pos = ia->write.in.offset - io->offset + | |
689 | ia->write.out.size; | |
690 | } | |
01e9d11a | 691 | } else { |
45ac96ed MS |
692 | u32 outsize = args->out_args[0].size; |
693 | ||
694 | if (ia->read.in.size != outsize) | |
695 | pos = ia->read.in.offset - io->offset + outsize; | |
01e9d11a MP |
696 | } |
697 | ||
45ac96ed MS |
698 | fuse_aio_complete(io, err, pos); |
699 | fuse_io_free(ia); | |
01e9d11a MP |
700 | } |
701 | ||
45ac96ed MS |
702 | static ssize_t fuse_async_req_send(struct fuse_conn *fc, |
703 | struct fuse_io_args *ia, size_t num_bytes) | |
01e9d11a | 704 | { |
45ac96ed MS |
705 | ssize_t err; |
706 | struct fuse_io_priv *io = ia->io; | |
707 | ||
01e9d11a | 708 | spin_lock(&io->lock); |
744742d6 | 709 | kref_get(&io->refcnt); |
01e9d11a MP |
710 | io->size += num_bytes; |
711 | io->reqs++; | |
712 | spin_unlock(&io->lock); | |
713 | ||
45ac96ed MS |
714 | ia->ap.args.end = fuse_aio_complete_req; |
715 | err = fuse_simple_background(fc, &ia->ap.args, GFP_KERNEL); | |
f1ebdeff MS |
716 | if (err) |
717 | fuse_aio_complete_req(fc, &ia->ap.args, err); | |
01e9d11a | 718 | |
f1ebdeff | 719 | return num_bytes; |
01e9d11a MP |
720 | } |
721 | ||
45ac96ed MS |
722 | static ssize_t fuse_send_read(struct fuse_io_args *ia, loff_t pos, size_t count, |
723 | fl_owner_t owner) | |
04730fef | 724 | { |
45ac96ed | 725 | struct file *file = ia->io->iocb->ki_filp; |
2106cb18 MS |
726 | struct fuse_file *ff = file->private_data; |
727 | struct fuse_conn *fc = ff->fc; | |
f3332114 | 728 | |
45ac96ed | 729 | fuse_read_args_fill(ia, file, pos, count, FUSE_READ); |
f3332114 | 730 | if (owner != NULL) { |
45ac96ed MS |
731 | ia->read.in.read_flags |= FUSE_READ_LOCKOWNER; |
732 | ia->read.in.lock_owner = fuse_lock_owner_id(fc, owner); | |
f3332114 | 733 | } |
36cf66ed | 734 | |
45ac96ed MS |
735 | if (ia->io->async) |
736 | return fuse_async_req_send(fc, ia, count); | |
36cf66ed | 737 | |
45ac96ed | 738 | return fuse_simple_request(fc, &ia->ap.args); |
04730fef MS |
739 | } |
740 | ||
5c5c5e51 MS |
741 | static void fuse_read_update_size(struct inode *inode, loff_t size, |
742 | u64 attr_ver) | |
743 | { | |
744 | struct fuse_conn *fc = get_fuse_conn(inode); | |
745 | struct fuse_inode *fi = get_fuse_inode(inode); | |
746 | ||
f15ecfef | 747 | spin_lock(&fi->lock); |
06a7c3c2 MP |
748 | if (attr_ver == fi->attr_version && size < inode->i_size && |
749 | !test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
4510d86f | 750 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
5c5c5e51 MS |
751 | i_size_write(inode, size); |
752 | } | |
f15ecfef | 753 | spin_unlock(&fi->lock); |
5c5c5e51 MS |
754 | } |
755 | ||
a0d45d84 | 756 | static void fuse_short_read(struct inode *inode, u64 attr_ver, size_t num_read, |
134831e3 | 757 | struct fuse_args_pages *ap) |
a92adc82 | 758 | { |
8373200b PE |
759 | struct fuse_conn *fc = get_fuse_conn(inode); |
760 | ||
761 | if (fc->writeback_cache) { | |
762 | /* | |
763 | * A hole in a file. Some data after the hole are in page cache, | |
764 | * but have not reached the client fs yet. So, the hole is not | |
765 | * present there. | |
766 | */ | |
767 | int i; | |
09cbfeaf KS |
768 | int start_idx = num_read >> PAGE_SHIFT; |
769 | size_t off = num_read & (PAGE_SIZE - 1); | |
a92adc82 | 770 | |
134831e3 MS |
771 | for (i = start_idx; i < ap->num_pages; i++) { |
772 | zero_user_segment(ap->pages[i], off, PAGE_SIZE); | |
8373200b PE |
773 | off = 0; |
774 | } | |
775 | } else { | |
134831e3 | 776 | loff_t pos = page_offset(ap->pages[0]) + num_read; |
8373200b PE |
777 | fuse_read_update_size(inode, pos, attr_ver); |
778 | } | |
a92adc82 PE |
779 | } |
780 | ||
482fce55 | 781 | static int fuse_do_readpage(struct file *file, struct page *page) |
b6aeaded MS |
782 | { |
783 | struct inode *inode = page->mapping->host; | |
784 | struct fuse_conn *fc = get_fuse_conn(inode); | |
5c5c5e51 | 785 | loff_t pos = page_offset(page); |
00793ca5 MS |
786 | struct fuse_page_desc desc = { .length = PAGE_SIZE }; |
787 | struct fuse_io_args ia = { | |
788 | .ap.args.page_zeroing = true, | |
789 | .ap.args.out_pages = true, | |
790 | .ap.num_pages = 1, | |
791 | .ap.pages = &page, | |
792 | .ap.descs = &desc, | |
793 | }; | |
794 | ssize_t res; | |
5c5c5e51 | 795 | u64 attr_ver; |
248d86e8 | 796 | |
3be5a52b | 797 | /* |
25985edc | 798 | * Page writeback can extend beyond the lifetime of the |
3be5a52b MS |
799 | * page-cache page, so make sure we read a properly synced |
800 | * page. | |
801 | */ | |
802 | fuse_wait_on_page_writeback(inode, page->index); | |
803 | ||
5c5c5e51 MS |
804 | attr_ver = fuse_get_attr_version(fc); |
805 | ||
00793ca5 MS |
806 | fuse_read_args_fill(&ia, file, pos, desc.length, FUSE_READ); |
807 | res = fuse_simple_request(fc, &ia.ap.args); | |
808 | if (res < 0) | |
809 | return res; | |
810 | /* | |
811 | * Short read means EOF. If file size is larger, truncate it | |
812 | */ | |
813 | if (res < desc.length) | |
134831e3 | 814 | fuse_short_read(inode, attr_ver, res, &ia.ap); |
5c5c5e51 | 815 | |
00793ca5 | 816 | SetPageUptodate(page); |
482fce55 | 817 | |
00793ca5 | 818 | return 0; |
482fce55 MP |
819 | } |
820 | ||
821 | static int fuse_readpage(struct file *file, struct page *page) | |
822 | { | |
823 | struct inode *inode = page->mapping->host; | |
824 | int err; | |
825 | ||
826 | err = -EIO; | |
827 | if (is_bad_inode(inode)) | |
828 | goto out; | |
829 | ||
830 | err = fuse_do_readpage(file, page); | |
451418fc | 831 | fuse_invalidate_atime(inode); |
b6aeaded MS |
832 | out: |
833 | unlock_page(page); | |
834 | return err; | |
835 | } | |
836 | ||
134831e3 MS |
837 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_args *args, |
838 | int err) | |
db50b96c | 839 | { |
c1aa96a5 | 840 | int i; |
134831e3 MS |
841 | struct fuse_io_args *ia = container_of(args, typeof(*ia), ap.args); |
842 | struct fuse_args_pages *ap = &ia->ap; | |
843 | size_t count = ia->read.in.size; | |
844 | size_t num_read = args->out_args[0].size; | |
ce534fb0 | 845 | struct address_space *mapping = NULL; |
c1aa96a5 | 846 | |
134831e3 MS |
847 | for (i = 0; mapping == NULL && i < ap->num_pages; i++) |
848 | mapping = ap->pages[i]->mapping; | |
5c5c5e51 | 849 | |
ce534fb0 MS |
850 | if (mapping) { |
851 | struct inode *inode = mapping->host; | |
852 | ||
853 | /* | |
854 | * Short read means EOF. If file size is larger, truncate it | |
855 | */ | |
134831e3 MS |
856 | if (!err && num_read < count) |
857 | fuse_short_read(inode, ia->read.attr_ver, num_read, ap); | |
ce534fb0 | 858 | |
451418fc | 859 | fuse_invalidate_atime(inode); |
ce534fb0 | 860 | } |
c1aa96a5 | 861 | |
134831e3 MS |
862 | for (i = 0; i < ap->num_pages; i++) { |
863 | struct page *page = ap->pages[i]; | |
864 | ||
865 | if (!err) | |
db50b96c | 866 | SetPageUptodate(page); |
c1aa96a5 MS |
867 | else |
868 | SetPageError(page); | |
db50b96c | 869 | unlock_page(page); |
09cbfeaf | 870 | put_page(page); |
db50b96c | 871 | } |
134831e3 MS |
872 | if (ia->ff) |
873 | fuse_file_put(ia->ff, false, false); | |
874 | ||
875 | fuse_io_free(ia); | |
c1aa96a5 MS |
876 | } |
877 | ||
134831e3 | 878 | static void fuse_send_readpages(struct fuse_io_args *ia, struct file *file) |
c1aa96a5 | 879 | { |
2106cb18 MS |
880 | struct fuse_file *ff = file->private_data; |
881 | struct fuse_conn *fc = ff->fc; | |
134831e3 MS |
882 | struct fuse_args_pages *ap = &ia->ap; |
883 | loff_t pos = page_offset(ap->pages[0]); | |
884 | size_t count = ap->num_pages << PAGE_SHIFT; | |
885 | int err; | |
886 | ||
887 | ap->args.out_pages = true; | |
888 | ap->args.page_zeroing = true; | |
889 | ap->args.page_replace = true; | |
890 | fuse_read_args_fill(ia, file, pos, count, FUSE_READ); | |
891 | ia->read.attr_ver = fuse_get_attr_version(fc); | |
9cd68455 | 892 | if (fc->async_read) { |
134831e3 MS |
893 | ia->ff = fuse_file_get(ff); |
894 | ap->args.end = fuse_readpages_end; | |
895 | err = fuse_simple_background(fc, &ap->args, GFP_KERNEL); | |
896 | if (!err) | |
897 | return; | |
9cd68455 | 898 | } else { |
134831e3 | 899 | err = fuse_simple_request(fc, &ap->args); |
9cd68455 | 900 | } |
134831e3 | 901 | fuse_readpages_end(fc, &ap->args, err); |
db50b96c MS |
902 | } |
903 | ||
c756e0a4 | 904 | struct fuse_fill_data { |
134831e3 | 905 | struct fuse_io_args *ia; |
a6643094 | 906 | struct file *file; |
db50b96c | 907 | struct inode *inode; |
134831e3 MS |
908 | unsigned int nr_pages; |
909 | unsigned int max_pages; | |
db50b96c MS |
910 | }; |
911 | ||
912 | static int fuse_readpages_fill(void *_data, struct page *page) | |
913 | { | |
c756e0a4 | 914 | struct fuse_fill_data *data = _data; |
134831e3 MS |
915 | struct fuse_io_args *ia = data->ia; |
916 | struct fuse_args_pages *ap = &ia->ap; | |
db50b96c MS |
917 | struct inode *inode = data->inode; |
918 | struct fuse_conn *fc = get_fuse_conn(inode); | |
919 | ||
3be5a52b MS |
920 | fuse_wait_on_page_writeback(inode, page->index); |
921 | ||
134831e3 MS |
922 | if (ap->num_pages && |
923 | (ap->num_pages == fc->max_pages || | |
924 | (ap->num_pages + 1) * PAGE_SIZE > fc->max_read || | |
925 | ap->pages[ap->num_pages - 1]->index + 1 != page->index)) { | |
926 | data->max_pages = min_t(unsigned int, data->nr_pages, | |
927 | fc->max_pages); | |
928 | fuse_send_readpages(ia, data->file); | |
929 | data->ia = ia = fuse_io_alloc(NULL, data->max_pages); | |
930 | if (!ia) { | |
db50b96c | 931 | unlock_page(page); |
134831e3 | 932 | return -ENOMEM; |
db50b96c | 933 | } |
134831e3 | 934 | ap = &ia->ap; |
db50b96c | 935 | } |
f8dbdf81 | 936 | |
134831e3 | 937 | if (WARN_ON(ap->num_pages >= data->max_pages)) { |
109728cc | 938 | unlock_page(page); |
134831e3 | 939 | fuse_io_free(ia); |
f8dbdf81 MP |
940 | return -EIO; |
941 | } | |
942 | ||
09cbfeaf | 943 | get_page(page); |
134831e3 MS |
944 | ap->pages[ap->num_pages] = page; |
945 | ap->descs[ap->num_pages].length = PAGE_SIZE; | |
946 | ap->num_pages++; | |
f8dbdf81 | 947 | data->nr_pages--; |
db50b96c MS |
948 | return 0; |
949 | } | |
950 | ||
951 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
952 | struct list_head *pages, unsigned nr_pages) | |
953 | { | |
954 | struct inode *inode = mapping->host; | |
955 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 956 | struct fuse_fill_data data; |
db50b96c | 957 | int err; |
248d86e8 | 958 | |
1d7ea732 | 959 | err = -EIO; |
248d86e8 | 960 | if (is_bad_inode(inode)) |
2e990021 | 961 | goto out; |
248d86e8 | 962 | |
a6643094 | 963 | data.file = file; |
db50b96c | 964 | data.inode = inode; |
f8dbdf81 | 965 | data.nr_pages = nr_pages; |
134831e3 MS |
966 | data.max_pages = min_t(unsigned int, nr_pages, fc->max_pages); |
967 | ; | |
968 | data.ia = fuse_io_alloc(NULL, data.max_pages); | |
969 | err = -ENOMEM; | |
970 | if (!data.ia) | |
2e990021 | 971 | goto out; |
db50b96c MS |
972 | |
973 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa | 974 | if (!err) { |
134831e3 MS |
975 | if (data.ia->ap.num_pages) |
976 | fuse_send_readpages(data.ia, file); | |
d3406ffa | 977 | else |
134831e3 | 978 | fuse_io_free(data.ia); |
d3406ffa | 979 | } |
2e990021 | 980 | out: |
1d7ea732 | 981 | return err; |
db50b96c MS |
982 | } |
983 | ||
55752a3a | 984 | static ssize_t fuse_cache_read_iter(struct kiocb *iocb, struct iov_iter *to) |
bcb4be80 MS |
985 | { |
986 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
a8894274 | 987 | struct fuse_conn *fc = get_fuse_conn(inode); |
bcb4be80 | 988 | |
a8894274 BF |
989 | /* |
990 | * In auto invalidate mode, always update attributes on read. | |
991 | * Otherwise, only update if we attempt to read past EOF (to ensure | |
992 | * i_size is up to date). | |
993 | */ | |
994 | if (fc->auto_inval_data || | |
37c20f16 | 995 | (iocb->ki_pos + iov_iter_count(to) > i_size_read(inode))) { |
bcb4be80 | 996 | int err; |
5b97eeac | 997 | err = fuse_update_attributes(inode, iocb->ki_filp); |
bcb4be80 MS |
998 | if (err) |
999 | return err; | |
1000 | } | |
1001 | ||
37c20f16 | 1002 | return generic_file_read_iter(iocb, to); |
bcb4be80 MS |
1003 | } |
1004 | ||
338f2e3f MS |
1005 | static void fuse_write_args_fill(struct fuse_io_args *ia, struct fuse_file *ff, |
1006 | loff_t pos, size_t count) | |
1007 | { | |
1008 | struct fuse_args *args = &ia->ap.args; | |
1009 | ||
1010 | ia->write.in.fh = ff->fh; | |
1011 | ia->write.in.offset = pos; | |
1012 | ia->write.in.size = count; | |
1013 | args->opcode = FUSE_WRITE; | |
1014 | args->nodeid = ff->nodeid; | |
1015 | args->in_numargs = 2; | |
1016 | if (ff->fc->minor < 9) | |
1017 | args->in_args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; | |
1018 | else | |
1019 | args->in_args[0].size = sizeof(ia->write.in); | |
1020 | args->in_args[0].value = &ia->write.in; | |
1021 | args->in_args[1].size = count; | |
1022 | args->out_numargs = 1; | |
1023 | args->out_args[0].size = sizeof(ia->write.out); | |
1024 | args->out_args[0].value = &ia->write.out; | |
1025 | } | |
1026 | ||
1027 | static unsigned int fuse_write_flags(struct kiocb *iocb) | |
1028 | { | |
1029 | unsigned int flags = iocb->ki_filp->f_flags; | |
1030 | ||
1031 | if (iocb->ki_flags & IOCB_DSYNC) | |
1032 | flags |= O_DSYNC; | |
1033 | if (iocb->ki_flags & IOCB_SYNC) | |
1034 | flags |= O_SYNC; | |
1035 | ||
1036 | return flags; | |
1037 | } | |
1038 | ||
45ac96ed MS |
1039 | static ssize_t fuse_send_write(struct fuse_io_args *ia, loff_t pos, |
1040 | size_t count, fl_owner_t owner) | |
b25e82e5 | 1041 | { |
45ac96ed | 1042 | struct kiocb *iocb = ia->io->iocb; |
e1c0eecb | 1043 | struct file *file = iocb->ki_filp; |
2106cb18 MS |
1044 | struct fuse_file *ff = file->private_data; |
1045 | struct fuse_conn *fc = ff->fc; | |
45ac96ed MS |
1046 | struct fuse_write_in *inarg = &ia->write.in; |
1047 | ssize_t err; | |
2d698b07 | 1048 | |
45ac96ed | 1049 | fuse_write_args_fill(ia, ff, pos, count); |
338f2e3f | 1050 | inarg->flags = fuse_write_flags(iocb); |
f3332114 | 1051 | if (owner != NULL) { |
f3332114 MS |
1052 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; |
1053 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
1054 | } | |
36cf66ed | 1055 | |
45ac96ed MS |
1056 | if (ia->io->async) |
1057 | return fuse_async_req_send(fc, ia, count); | |
1058 | ||
1059 | err = fuse_simple_request(fc, &ia->ap.args); | |
1060 | if (!err && ia->write.out.size > count) | |
1061 | err = -EIO; | |
36cf66ed | 1062 | |
45ac96ed | 1063 | return err ?: ia->write.out.size; |
b6aeaded MS |
1064 | } |
1065 | ||
b0aa7606 | 1066 | bool fuse_write_update_size(struct inode *inode, loff_t pos) |
854512ec MS |
1067 | { |
1068 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1069 | struct fuse_inode *fi = get_fuse_inode(inode); | |
b0aa7606 | 1070 | bool ret = false; |
854512ec | 1071 | |
f15ecfef | 1072 | spin_lock(&fi->lock); |
4510d86f | 1073 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
b0aa7606 | 1074 | if (pos > inode->i_size) { |
854512ec | 1075 | i_size_write(inode, pos); |
b0aa7606 MP |
1076 | ret = true; |
1077 | } | |
f15ecfef | 1078 | spin_unlock(&fi->lock); |
b0aa7606 MP |
1079 | |
1080 | return ret; | |
854512ec MS |
1081 | } |
1082 | ||
338f2e3f MS |
1083 | static ssize_t fuse_send_write_pages(struct fuse_io_args *ia, |
1084 | struct kiocb *iocb, struct inode *inode, | |
1085 | loff_t pos, size_t count) | |
ea9b9907 | 1086 | { |
338f2e3f MS |
1087 | struct fuse_args_pages *ap = &ia->ap; |
1088 | struct file *file = iocb->ki_filp; | |
1089 | struct fuse_file *ff = file->private_data; | |
1090 | struct fuse_conn *fc = ff->fc; | |
1091 | unsigned int offset, i; | |
1092 | int err; | |
ea9b9907 | 1093 | |
338f2e3f MS |
1094 | for (i = 0; i < ap->num_pages; i++) |
1095 | fuse_wait_on_page_writeback(inode, ap->pages[i]->index); | |
ea9b9907 | 1096 | |
338f2e3f MS |
1097 | fuse_write_args_fill(ia, ff, pos, count); |
1098 | ia->write.in.flags = fuse_write_flags(iocb); | |
ea9b9907 | 1099 | |
338f2e3f | 1100 | err = fuse_simple_request(fc, &ap->args); |
8aab336b MS |
1101 | if (!err && ia->write.out.size > count) |
1102 | err = -EIO; | |
338f2e3f MS |
1103 | |
1104 | offset = ap->descs[0].offset; | |
1105 | count = ia->write.out.size; | |
1106 | for (i = 0; i < ap->num_pages; i++) { | |
1107 | struct page *page = ap->pages[i]; | |
ea9b9907 | 1108 | |
338f2e3f | 1109 | if (!err && !offset && count >= PAGE_SIZE) |
ea9b9907 NP |
1110 | SetPageUptodate(page); |
1111 | ||
09cbfeaf KS |
1112 | if (count > PAGE_SIZE - offset) |
1113 | count -= PAGE_SIZE - offset; | |
ea9b9907 NP |
1114 | else |
1115 | count = 0; | |
1116 | offset = 0; | |
1117 | ||
1118 | unlock_page(page); | |
09cbfeaf | 1119 | put_page(page); |
ea9b9907 NP |
1120 | } |
1121 | ||
338f2e3f | 1122 | return err; |
ea9b9907 NP |
1123 | } |
1124 | ||
338f2e3f MS |
1125 | static ssize_t fuse_fill_write_pages(struct fuse_args_pages *ap, |
1126 | struct address_space *mapping, | |
1127 | struct iov_iter *ii, loff_t pos, | |
1128 | unsigned int max_pages) | |
ea9b9907 NP |
1129 | { |
1130 | struct fuse_conn *fc = get_fuse_conn(mapping->host); | |
09cbfeaf | 1131 | unsigned offset = pos & (PAGE_SIZE - 1); |
ea9b9907 NP |
1132 | size_t count = 0; |
1133 | int err; | |
1134 | ||
338f2e3f MS |
1135 | ap->args.in_pages = true; |
1136 | ap->descs[0].offset = offset; | |
ea9b9907 NP |
1137 | |
1138 | do { | |
1139 | size_t tmp; | |
1140 | struct page *page; | |
09cbfeaf KS |
1141 | pgoff_t index = pos >> PAGE_SHIFT; |
1142 | size_t bytes = min_t(size_t, PAGE_SIZE - offset, | |
ea9b9907 NP |
1143 | iov_iter_count(ii)); |
1144 | ||
1145 | bytes = min_t(size_t, bytes, fc->max_write - count); | |
1146 | ||
1147 | again: | |
1148 | err = -EFAULT; | |
1149 | if (iov_iter_fault_in_readable(ii, bytes)) | |
1150 | break; | |
1151 | ||
1152 | err = -ENOMEM; | |
54566b2c | 1153 | page = grab_cache_page_write_begin(mapping, index, 0); |
ea9b9907 NP |
1154 | if (!page) |
1155 | break; | |
1156 | ||
931e80e4 | 1157 | if (mapping_writably_mapped(mapping)) |
1158 | flush_dcache_page(page); | |
1159 | ||
ea9b9907 | 1160 | tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); |
ea9b9907 NP |
1161 | flush_dcache_page(page); |
1162 | ||
3ca8138f | 1163 | iov_iter_advance(ii, tmp); |
ea9b9907 NP |
1164 | if (!tmp) { |
1165 | unlock_page(page); | |
09cbfeaf | 1166 | put_page(page); |
ea9b9907 NP |
1167 | bytes = min(bytes, iov_iter_single_seg_count(ii)); |
1168 | goto again; | |
1169 | } | |
1170 | ||
1171 | err = 0; | |
338f2e3f MS |
1172 | ap->pages[ap->num_pages] = page; |
1173 | ap->descs[ap->num_pages].length = tmp; | |
1174 | ap->num_pages++; | |
ea9b9907 | 1175 | |
ea9b9907 NP |
1176 | count += tmp; |
1177 | pos += tmp; | |
1178 | offset += tmp; | |
09cbfeaf | 1179 | if (offset == PAGE_SIZE) |
ea9b9907 NP |
1180 | offset = 0; |
1181 | ||
78bb6cb9 MS |
1182 | if (!fc->big_writes) |
1183 | break; | |
ea9b9907 | 1184 | } while (iov_iter_count(ii) && count < fc->max_write && |
338f2e3f | 1185 | ap->num_pages < max_pages && offset == 0); |
ea9b9907 NP |
1186 | |
1187 | return count > 0 ? count : err; | |
1188 | } | |
1189 | ||
5da784cc CS |
1190 | static inline unsigned int fuse_wr_pages(loff_t pos, size_t len, |
1191 | unsigned int max_pages) | |
d07f09f5 | 1192 | { |
5da784cc | 1193 | return min_t(unsigned int, |
09cbfeaf KS |
1194 | ((pos + len - 1) >> PAGE_SHIFT) - |
1195 | (pos >> PAGE_SHIFT) + 1, | |
5da784cc | 1196 | max_pages); |
d07f09f5 MP |
1197 | } |
1198 | ||
e1c0eecb | 1199 | static ssize_t fuse_perform_write(struct kiocb *iocb, |
ea9b9907 NP |
1200 | struct address_space *mapping, |
1201 | struct iov_iter *ii, loff_t pos) | |
1202 | { | |
1203 | struct inode *inode = mapping->host; | |
1204 | struct fuse_conn *fc = get_fuse_conn(inode); | |
06a7c3c2 | 1205 | struct fuse_inode *fi = get_fuse_inode(inode); |
ea9b9907 NP |
1206 | int err = 0; |
1207 | ssize_t res = 0; | |
1208 | ||
06a7c3c2 MP |
1209 | if (inode->i_size < pos + iov_iter_count(ii)) |
1210 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
1211 | ||
ea9b9907 | 1212 | do { |
ea9b9907 | 1213 | ssize_t count; |
338f2e3f MS |
1214 | struct fuse_io_args ia = {}; |
1215 | struct fuse_args_pages *ap = &ia.ap; | |
5da784cc CS |
1216 | unsigned int nr_pages = fuse_wr_pages(pos, iov_iter_count(ii), |
1217 | fc->max_pages); | |
ea9b9907 | 1218 | |
338f2e3f MS |
1219 | ap->pages = fuse_pages_alloc(nr_pages, GFP_KERNEL, &ap->descs); |
1220 | if (!ap->pages) { | |
1221 | err = -ENOMEM; | |
ea9b9907 NP |
1222 | break; |
1223 | } | |
1224 | ||
338f2e3f | 1225 | count = fuse_fill_write_pages(ap, mapping, ii, pos, nr_pages); |
ea9b9907 NP |
1226 | if (count <= 0) { |
1227 | err = count; | |
1228 | } else { | |
338f2e3f MS |
1229 | err = fuse_send_write_pages(&ia, iocb, inode, |
1230 | pos, count); | |
ea9b9907 | 1231 | if (!err) { |
338f2e3f MS |
1232 | size_t num_written = ia.write.out.size; |
1233 | ||
ea9b9907 NP |
1234 | res += num_written; |
1235 | pos += num_written; | |
1236 | ||
1237 | /* break out of the loop on short write */ | |
1238 | if (num_written != count) | |
1239 | err = -EIO; | |
1240 | } | |
1241 | } | |
338f2e3f | 1242 | kfree(ap->pages); |
ea9b9907 NP |
1243 | } while (!err && iov_iter_count(ii)); |
1244 | ||
1245 | if (res > 0) | |
1246 | fuse_write_update_size(inode, pos); | |
1247 | ||
06a7c3c2 | 1248 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
ea9b9907 NP |
1249 | fuse_invalidate_attr(inode); |
1250 | ||
1251 | return res > 0 ? res : err; | |
1252 | } | |
1253 | ||
55752a3a | 1254 | static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ea9b9907 NP |
1255 | { |
1256 | struct file *file = iocb->ki_filp; | |
1257 | struct address_space *mapping = file->f_mapping; | |
ea9b9907 | 1258 | ssize_t written = 0; |
4273b793 | 1259 | ssize_t written_buffered = 0; |
ea9b9907 NP |
1260 | struct inode *inode = mapping->host; |
1261 | ssize_t err; | |
4273b793 | 1262 | loff_t endbyte = 0; |
ea9b9907 | 1263 | |
4d99ff8f PE |
1264 | if (get_fuse_conn(inode)->writeback_cache) { |
1265 | /* Update size (EOF optimization) and mode (SUID clearing) */ | |
5b97eeac | 1266 | err = fuse_update_attributes(mapping->host, file); |
4d99ff8f PE |
1267 | if (err) |
1268 | return err; | |
1269 | ||
84c3d55c | 1270 | return generic_file_write_iter(iocb, from); |
4d99ff8f PE |
1271 | } |
1272 | ||
5955102c | 1273 | inode_lock(inode); |
ea9b9907 NP |
1274 | |
1275 | /* We can write back this queue in page reclaim */ | |
de1414a6 | 1276 | current->backing_dev_info = inode_to_bdi(inode); |
ea9b9907 | 1277 | |
3309dd04 AV |
1278 | err = generic_write_checks(iocb, from); |
1279 | if (err <= 0) | |
ea9b9907 NP |
1280 | goto out; |
1281 | ||
5fa8e0a1 | 1282 | err = file_remove_privs(file); |
ea9b9907 NP |
1283 | if (err) |
1284 | goto out; | |
1285 | ||
c3b2da31 JB |
1286 | err = file_update_time(file); |
1287 | if (err) | |
1288 | goto out; | |
ea9b9907 | 1289 | |
2ba48ce5 | 1290 | if (iocb->ki_flags & IOCB_DIRECT) { |
3309dd04 | 1291 | loff_t pos = iocb->ki_pos; |
1af5bb49 | 1292 | written = generic_file_direct_write(iocb, from); |
84c3d55c | 1293 | if (written < 0 || !iov_iter_count(from)) |
4273b793 AA |
1294 | goto out; |
1295 | ||
1296 | pos += written; | |
ea9b9907 | 1297 | |
e1c0eecb | 1298 | written_buffered = fuse_perform_write(iocb, mapping, from, pos); |
4273b793 AA |
1299 | if (written_buffered < 0) { |
1300 | err = written_buffered; | |
1301 | goto out; | |
1302 | } | |
1303 | endbyte = pos + written_buffered - 1; | |
1304 | ||
1305 | err = filemap_write_and_wait_range(file->f_mapping, pos, | |
1306 | endbyte); | |
1307 | if (err) | |
1308 | goto out; | |
1309 | ||
1310 | invalidate_mapping_pages(file->f_mapping, | |
09cbfeaf KS |
1311 | pos >> PAGE_SHIFT, |
1312 | endbyte >> PAGE_SHIFT); | |
4273b793 AA |
1313 | |
1314 | written += written_buffered; | |
1315 | iocb->ki_pos = pos + written_buffered; | |
1316 | } else { | |
e1c0eecb | 1317 | written = fuse_perform_write(iocb, mapping, from, iocb->ki_pos); |
4273b793 | 1318 | if (written >= 0) |
3309dd04 | 1319 | iocb->ki_pos += written; |
4273b793 | 1320 | } |
ea9b9907 NP |
1321 | out: |
1322 | current->backing_dev_info = NULL; | |
5955102c | 1323 | inode_unlock(inode); |
e1c0eecb MS |
1324 | if (written > 0) |
1325 | written = generic_write_sync(iocb, written); | |
ea9b9907 NP |
1326 | |
1327 | return written ? written : err; | |
1328 | } | |
1329 | ||
093f38a2 MS |
1330 | static inline void fuse_page_descs_length_init(struct fuse_page_desc *descs, |
1331 | unsigned int index, | |
1332 | unsigned int nr_pages) | |
85f40aec MP |
1333 | { |
1334 | int i; | |
1335 | ||
7c190c8b | 1336 | for (i = index; i < index + nr_pages; i++) |
093f38a2 | 1337 | descs[i].length = PAGE_SIZE - descs[i].offset; |
85f40aec MP |
1338 | } |
1339 | ||
7c190c8b MP |
1340 | static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii) |
1341 | { | |
1342 | return (unsigned long)ii->iov->iov_base + ii->iov_offset; | |
1343 | } | |
1344 | ||
1345 | static inline size_t fuse_get_frag_size(const struct iov_iter *ii, | |
1346 | size_t max_size) | |
1347 | { | |
1348 | return min(iov_iter_single_seg_count(ii), max_size); | |
1349 | } | |
1350 | ||
45ac96ed MS |
1351 | static int fuse_get_user_pages(struct fuse_args_pages *ap, struct iov_iter *ii, |
1352 | size_t *nbytesp, int write, | |
1353 | unsigned int max_pages) | |
413ef8cb | 1354 | { |
7c190c8b | 1355 | size_t nbytes = 0; /* # bytes already packed in req */ |
742f9927 | 1356 | ssize_t ret = 0; |
b98d023a | 1357 | |
f4975c67 | 1358 | /* Special case for kernel I/O: can copy directly into the buffer */ |
00e23707 | 1359 | if (iov_iter_is_kvec(ii)) { |
7c190c8b MP |
1360 | unsigned long user_addr = fuse_get_user_addr(ii); |
1361 | size_t frag_size = fuse_get_frag_size(ii, *nbytesp); | |
1362 | ||
f4975c67 | 1363 | if (write) |
45ac96ed | 1364 | ap->args.in_args[1].value = (void *) user_addr; |
f4975c67 | 1365 | else |
45ac96ed | 1366 | ap->args.out_args[0].value = (void *) user_addr; |
f4975c67 | 1367 | |
b98d023a MP |
1368 | iov_iter_advance(ii, frag_size); |
1369 | *nbytesp = frag_size; | |
f4975c67 MS |
1370 | return 0; |
1371 | } | |
413ef8cb | 1372 | |
45ac96ed | 1373 | while (nbytes < *nbytesp && ap->num_pages < max_pages) { |
7c190c8b | 1374 | unsigned npages; |
f67da30c | 1375 | size_t start; |
45ac96ed | 1376 | ret = iov_iter_get_pages(ii, &ap->pages[ap->num_pages], |
2c80929c | 1377 | *nbytesp - nbytes, |
45ac96ed | 1378 | max_pages - ap->num_pages, |
c7f3888a | 1379 | &start); |
7c190c8b | 1380 | if (ret < 0) |
742f9927 | 1381 | break; |
7c190c8b | 1382 | |
c9c37e2e AV |
1383 | iov_iter_advance(ii, ret); |
1384 | nbytes += ret; | |
7c190c8b | 1385 | |
c9c37e2e AV |
1386 | ret += start; |
1387 | npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE; | |
7c190c8b | 1388 | |
45ac96ed MS |
1389 | ap->descs[ap->num_pages].offset = start; |
1390 | fuse_page_descs_length_init(ap->descs, ap->num_pages, npages); | |
7c190c8b | 1391 | |
45ac96ed MS |
1392 | ap->num_pages += npages; |
1393 | ap->descs[ap->num_pages - 1].length -= | |
c9c37e2e | 1394 | (PAGE_SIZE - ret) & (PAGE_SIZE - 1); |
7c190c8b | 1395 | } |
f4975c67 MS |
1396 | |
1397 | if (write) | |
45ac96ed | 1398 | ap->args.in_pages = 1; |
f4975c67 | 1399 | else |
45ac96ed | 1400 | ap->args.out_pages = 1; |
f4975c67 | 1401 | |
7c190c8b | 1402 | *nbytesp = nbytes; |
f4975c67 | 1403 | |
2c932d4c | 1404 | return ret < 0 ? ret : 0; |
413ef8cb MS |
1405 | } |
1406 | ||
d22a943f AV |
1407 | ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, |
1408 | loff_t *ppos, int flags) | |
413ef8cb | 1409 | { |
ea8cd333 PE |
1410 | int write = flags & FUSE_DIO_WRITE; |
1411 | int cuse = flags & FUSE_DIO_CUSE; | |
e1c0eecb | 1412 | struct file *file = io->iocb->ki_filp; |
ea8cd333 | 1413 | struct inode *inode = file->f_mapping->host; |
2106cb18 MS |
1414 | struct fuse_file *ff = file->private_data; |
1415 | struct fuse_conn *fc = ff->fc; | |
413ef8cb MS |
1416 | size_t nmax = write ? fc->max_write : fc->max_read; |
1417 | loff_t pos = *ppos; | |
d22a943f | 1418 | size_t count = iov_iter_count(iter); |
09cbfeaf KS |
1419 | pgoff_t idx_from = pos >> PAGE_SHIFT; |
1420 | pgoff_t idx_to = (pos + count - 1) >> PAGE_SHIFT; | |
413ef8cb | 1421 | ssize_t res = 0; |
742f9927 | 1422 | int err = 0; |
45ac96ed MS |
1423 | struct fuse_io_args *ia; |
1424 | unsigned int max_pages; | |
248d86e8 | 1425 | |
45ac96ed MS |
1426 | max_pages = iov_iter_npages(iter, fc->max_pages); |
1427 | ia = fuse_io_alloc(io, max_pages); | |
1428 | if (!ia) | |
1429 | return -ENOMEM; | |
413ef8cb | 1430 | |
45ac96ed | 1431 | ia->io = io; |
ea8cd333 PE |
1432 | if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) { |
1433 | if (!write) | |
5955102c | 1434 | inode_lock(inode); |
ea8cd333 PE |
1435 | fuse_sync_writes(inode); |
1436 | if (!write) | |
5955102c | 1437 | inode_unlock(inode); |
ea8cd333 PE |
1438 | } |
1439 | ||
61c12b49 | 1440 | io->should_dirty = !write && iter_is_iovec(iter); |
413ef8cb | 1441 | while (count) { |
45ac96ed | 1442 | ssize_t nres; |
2106cb18 | 1443 | fl_owner_t owner = current->files; |
f4975c67 | 1444 | size_t nbytes = min(count, nmax); |
45ac96ed MS |
1445 | |
1446 | err = fuse_get_user_pages(&ia->ap, iter, &nbytes, write, | |
1447 | max_pages); | |
742f9927 | 1448 | if (err && !nbytes) |
413ef8cb | 1449 | break; |
f4975c67 | 1450 | |
4a2abf99 | 1451 | if (write) { |
45ac96ed MS |
1452 | if (!capable(CAP_FSETID)) |
1453 | ia->write.in.write_flags |= FUSE_WRITE_KILL_PRIV; | |
4a2abf99 | 1454 | |
45ac96ed | 1455 | nres = fuse_send_write(ia, pos, nbytes, owner); |
4a2abf99 | 1456 | } else { |
45ac96ed | 1457 | nres = fuse_send_read(ia, pos, nbytes, owner); |
4a2abf99 | 1458 | } |
2106cb18 | 1459 | |
45ac96ed MS |
1460 | if (!io->async || nres < 0) { |
1461 | fuse_release_user_pages(&ia->ap, io->should_dirty); | |
1462 | fuse_io_free(ia); | |
1463 | } | |
1464 | ia = NULL; | |
1465 | if (nres < 0) { | |
1466 | err = nres; | |
413ef8cb MS |
1467 | break; |
1468 | } | |
45ac96ed MS |
1469 | WARN_ON(nres > nbytes); |
1470 | ||
413ef8cb MS |
1471 | count -= nres; |
1472 | res += nres; | |
1473 | pos += nres; | |
413ef8cb MS |
1474 | if (nres != nbytes) |
1475 | break; | |
56cf34ff | 1476 | if (count) { |
45ac96ed MS |
1477 | max_pages = iov_iter_npages(iter, fc->max_pages); |
1478 | ia = fuse_io_alloc(io, max_pages); | |
1479 | if (!ia) | |
56cf34ff MS |
1480 | break; |
1481 | } | |
413ef8cb | 1482 | } |
45ac96ed MS |
1483 | if (ia) |
1484 | fuse_io_free(ia); | |
d09cb9d7 | 1485 | if (res > 0) |
413ef8cb | 1486 | *ppos = pos; |
413ef8cb | 1487 | |
742f9927 | 1488 | return res > 0 ? res : err; |
413ef8cb | 1489 | } |
08cbf542 | 1490 | EXPORT_SYMBOL_GPL(fuse_direct_io); |
413ef8cb | 1491 | |
36cf66ed | 1492 | static ssize_t __fuse_direct_read(struct fuse_io_priv *io, |
d22a943f AV |
1493 | struct iov_iter *iter, |
1494 | loff_t *ppos) | |
413ef8cb | 1495 | { |
d09cb9d7 | 1496 | ssize_t res; |
e1c0eecb | 1497 | struct inode *inode = file_inode(io->iocb->ki_filp); |
d09cb9d7 | 1498 | |
d22a943f | 1499 | res = fuse_direct_io(io, iter, ppos, 0); |
d09cb9d7 | 1500 | |
9a2eb24d | 1501 | fuse_invalidate_atime(inode); |
d09cb9d7 MS |
1502 | |
1503 | return res; | |
413ef8cb MS |
1504 | } |
1505 | ||
23c94e1c MR |
1506 | static ssize_t fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter); |
1507 | ||
15316263 | 1508 | static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to) |
b98d023a | 1509 | { |
23c94e1c MR |
1510 | ssize_t res; |
1511 | ||
1512 | if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) { | |
23c94e1c MR |
1513 | res = fuse_direct_IO(iocb, to); |
1514 | } else { | |
1515 | struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb); | |
1516 | ||
1517 | res = __fuse_direct_read(&io, to, &iocb->ki_pos); | |
1518 | } | |
1519 | ||
1520 | return res; | |
b98d023a MP |
1521 | } |
1522 | ||
15316263 | 1523 | static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from) |
4273b793 | 1524 | { |
e1c0eecb MS |
1525 | struct inode *inode = file_inode(iocb->ki_filp); |
1526 | struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb); | |
15316263 | 1527 | ssize_t res; |
4273b793 | 1528 | |
4273b793 | 1529 | /* Don't allow parallel writes to the same file */ |
5955102c | 1530 | inode_lock(inode); |
3309dd04 | 1531 | res = generic_write_checks(iocb, from); |
23c94e1c MR |
1532 | if (res > 0) { |
1533 | if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) { | |
1534 | res = fuse_direct_IO(iocb, from); | |
1535 | } else { | |
1536 | res = fuse_direct_io(&io, from, &iocb->ki_pos, | |
1537 | FUSE_DIO_WRITE); | |
1538 | } | |
1539 | } | |
812408fb | 1540 | fuse_invalidate_attr(inode); |
bcba24cc | 1541 | if (res > 0) |
15316263 | 1542 | fuse_write_update_size(inode, iocb->ki_pos); |
5955102c | 1543 | inode_unlock(inode); |
4273b793 AA |
1544 | |
1545 | return res; | |
1546 | } | |
1547 | ||
55752a3a MS |
1548 | static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1549 | { | |
2f7b6f5b MS |
1550 | struct file *file = iocb->ki_filp; |
1551 | struct fuse_file *ff = file->private_data; | |
1552 | ||
1553 | if (is_bad_inode(file_inode(file))) | |
1554 | return -EIO; | |
55752a3a MS |
1555 | |
1556 | if (!(ff->open_flags & FOPEN_DIRECT_IO)) | |
1557 | return fuse_cache_read_iter(iocb, to); | |
1558 | else | |
1559 | return fuse_direct_read_iter(iocb, to); | |
1560 | } | |
1561 | ||
1562 | static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) | |
1563 | { | |
2f7b6f5b MS |
1564 | struct file *file = iocb->ki_filp; |
1565 | struct fuse_file *ff = file->private_data; | |
1566 | ||
1567 | if (is_bad_inode(file_inode(file))) | |
1568 | return -EIO; | |
55752a3a MS |
1569 | |
1570 | if (!(ff->open_flags & FOPEN_DIRECT_IO)) | |
1571 | return fuse_cache_write_iter(iocb, from); | |
1572 | else | |
1573 | return fuse_direct_write_iter(iocb, from); | |
1574 | } | |
1575 | ||
33826ebb | 1576 | static void fuse_writepage_free(struct fuse_writepage_args *wpa) |
b6aeaded | 1577 | { |
33826ebb | 1578 | struct fuse_args_pages *ap = &wpa->ia.ap; |
385b1268 PE |
1579 | int i; |
1580 | ||
33826ebb MS |
1581 | for (i = 0; i < ap->num_pages; i++) |
1582 | __free_page(ap->pages[i]); | |
1583 | ||
1584 | if (wpa->ia.ff) | |
1585 | fuse_file_put(wpa->ia.ff, false, false); | |
8b284dc4 | 1586 | |
33826ebb MS |
1587 | kfree(ap->pages); |
1588 | kfree(wpa); | |
3be5a52b MS |
1589 | } |
1590 | ||
33826ebb MS |
1591 | static void fuse_writepage_finish(struct fuse_conn *fc, |
1592 | struct fuse_writepage_args *wpa) | |
3be5a52b | 1593 | { |
33826ebb MS |
1594 | struct fuse_args_pages *ap = &wpa->ia.ap; |
1595 | struct inode *inode = wpa->inode; | |
3be5a52b | 1596 | struct fuse_inode *fi = get_fuse_inode(inode); |
de1414a6 | 1597 | struct backing_dev_info *bdi = inode_to_bdi(inode); |
385b1268 | 1598 | int i; |
3be5a52b | 1599 | |
33826ebb MS |
1600 | list_del(&wpa->writepages_entry); |
1601 | for (i = 0; i < ap->num_pages; i++) { | |
93f78d88 | 1602 | dec_wb_stat(&bdi->wb, WB_WRITEBACK); |
33826ebb | 1603 | dec_node_page_state(ap->pages[i], NR_WRITEBACK_TEMP); |
93f78d88 | 1604 | wb_writeout_inc(&bdi->wb); |
385b1268 | 1605 | } |
3be5a52b MS |
1606 | wake_up(&fi->page_waitq); |
1607 | } | |
1608 | ||
f15ecfef | 1609 | /* Called under fi->lock, may release and reacquire it */ |
33826ebb MS |
1610 | static void fuse_send_writepage(struct fuse_conn *fc, |
1611 | struct fuse_writepage_args *wpa, loff_t size) | |
f15ecfef KT |
1612 | __releases(fi->lock) |
1613 | __acquires(fi->lock) | |
3be5a52b | 1614 | { |
33826ebb MS |
1615 | struct fuse_writepage_args *aux, *next; |
1616 | struct fuse_inode *fi = get_fuse_inode(wpa->inode); | |
1617 | struct fuse_write_in *inarg = &wpa->ia.write.in; | |
1618 | struct fuse_args *args = &wpa->ia.ap.args; | |
1619 | __u64 data_size = wpa->ia.ap.num_pages * PAGE_SIZE; | |
1620 | int err; | |
3be5a52b | 1621 | |
33826ebb | 1622 | fi->writectr++; |
385b1268 PE |
1623 | if (inarg->offset + data_size <= size) { |
1624 | inarg->size = data_size; | |
3be5a52b | 1625 | } else if (inarg->offset < size) { |
385b1268 | 1626 | inarg->size = size - inarg->offset; |
3be5a52b MS |
1627 | } else { |
1628 | /* Got truncated off completely */ | |
1629 | goto out_free; | |
b6aeaded | 1630 | } |
3be5a52b | 1631 | |
33826ebb MS |
1632 | args->in_args[1].size = inarg->size; |
1633 | args->force = true; | |
1634 | args->nocreds = true; | |
1635 | ||
1636 | err = fuse_simple_background(fc, args, GFP_ATOMIC); | |
1637 | if (err == -ENOMEM) { | |
1638 | spin_unlock(&fi->lock); | |
1639 | err = fuse_simple_background(fc, args, GFP_NOFS | __GFP_NOFAIL); | |
1640 | spin_lock(&fi->lock); | |
1641 | } | |
1642 | ||
f15ecfef | 1643 | /* Fails on broken connection only */ |
33826ebb | 1644 | if (unlikely(err)) |
f15ecfef KT |
1645 | goto out_free; |
1646 | ||
3be5a52b MS |
1647 | return; |
1648 | ||
1649 | out_free: | |
33826ebb MS |
1650 | fi->writectr--; |
1651 | fuse_writepage_finish(fc, wpa); | |
f15ecfef | 1652 | spin_unlock(&fi->lock); |
e2653bd5 MS |
1653 | |
1654 | /* After fuse_writepage_finish() aux request list is private */ | |
33826ebb MS |
1655 | for (aux = wpa->next; aux; aux = next) { |
1656 | next = aux->next; | |
1657 | aux->next = NULL; | |
1658 | fuse_writepage_free(aux); | |
e2653bd5 MS |
1659 | } |
1660 | ||
33826ebb | 1661 | fuse_writepage_free(wpa); |
f15ecfef | 1662 | spin_lock(&fi->lock); |
b6aeaded MS |
1663 | } |
1664 | ||
3be5a52b MS |
1665 | /* |
1666 | * If fi->writectr is positive (no truncate or fsync going on) send | |
1667 | * all queued writepage requests. | |
1668 | * | |
f15ecfef | 1669 | * Called with fi->lock |
3be5a52b MS |
1670 | */ |
1671 | void fuse_flush_writepages(struct inode *inode) | |
f15ecfef KT |
1672 | __releases(fi->lock) |
1673 | __acquires(fi->lock) | |
b6aeaded | 1674 | { |
3be5a52b MS |
1675 | struct fuse_conn *fc = get_fuse_conn(inode); |
1676 | struct fuse_inode *fi = get_fuse_inode(inode); | |
9de5be06 | 1677 | loff_t crop = i_size_read(inode); |
33826ebb | 1678 | struct fuse_writepage_args *wpa; |
3be5a52b MS |
1679 | |
1680 | while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { | |
33826ebb MS |
1681 | wpa = list_entry(fi->queued_writes.next, |
1682 | struct fuse_writepage_args, queue_entry); | |
1683 | list_del_init(&wpa->queue_entry); | |
1684 | fuse_send_writepage(fc, wpa, crop); | |
3be5a52b MS |
1685 | } |
1686 | } | |
1687 | ||
33826ebb MS |
1688 | static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_args *args, |
1689 | int error) | |
3be5a52b | 1690 | { |
33826ebb MS |
1691 | struct fuse_writepage_args *wpa = |
1692 | container_of(args, typeof(*wpa), ia.ap.args); | |
1693 | struct inode *inode = wpa->inode; | |
3be5a52b MS |
1694 | struct fuse_inode *fi = get_fuse_inode(inode); |
1695 | ||
33826ebb | 1696 | mapping_set_error(inode->i_mapping, error); |
f15ecfef | 1697 | spin_lock(&fi->lock); |
33826ebb | 1698 | while (wpa->next) { |
6eaf4782 | 1699 | struct fuse_conn *fc = get_fuse_conn(inode); |
33826ebb MS |
1700 | struct fuse_write_in *inarg = &wpa->ia.write.in; |
1701 | struct fuse_writepage_args *next = wpa->next; | |
1702 | ||
1703 | wpa->next = next->next; | |
1704 | next->next = NULL; | |
1705 | next->ia.ff = fuse_file_get(wpa->ia.ff); | |
8b284dc4 | 1706 | list_add(&next->writepages_entry, &fi->writepages); |
6eaf4782 MP |
1707 | |
1708 | /* | |
1709 | * Skip fuse_flush_writepages() to make it easy to crop requests | |
1710 | * based on primary request size. | |
1711 | * | |
1712 | * 1st case (trivial): there are no concurrent activities using | |
1713 | * fuse_set/release_nowrite. Then we're on safe side because | |
1714 | * fuse_flush_writepages() would call fuse_send_writepage() | |
1715 | * anyway. | |
1716 | * | |
1717 | * 2nd case: someone called fuse_set_nowrite and it is waiting | |
1718 | * now for completion of all in-flight requests. This happens | |
1719 | * rarely and no more than once per page, so this should be | |
1720 | * okay. | |
1721 | * | |
1722 | * 3rd case: someone (e.g. fuse_do_setattr()) is in the middle | |
1723 | * of fuse_set_nowrite..fuse_release_nowrite section. The fact | |
1724 | * that fuse_set_nowrite returned implies that all in-flight | |
1725 | * requests were completed along with all of their secondary | |
1726 | * requests. Further primary requests are blocked by negative | |
1727 | * writectr. Hence there cannot be any in-flight requests and | |
1728 | * no invocations of fuse_writepage_end() while we're in | |
1729 | * fuse_set_nowrite..fuse_release_nowrite section. | |
1730 | */ | |
1731 | fuse_send_writepage(fc, next, inarg->offset + inarg->size); | |
8b284dc4 | 1732 | } |
3be5a52b | 1733 | fi->writectr--; |
33826ebb | 1734 | fuse_writepage_finish(fc, wpa); |
f15ecfef | 1735 | spin_unlock(&fi->lock); |
33826ebb | 1736 | fuse_writepage_free(wpa); |
3be5a52b MS |
1737 | } |
1738 | ||
1e18bda8 MS |
1739 | static struct fuse_file *__fuse_write_file_get(struct fuse_conn *fc, |
1740 | struct fuse_inode *fi) | |
adcadfa8 | 1741 | { |
72523425 | 1742 | struct fuse_file *ff = NULL; |
adcadfa8 | 1743 | |
f15ecfef | 1744 | spin_lock(&fi->lock); |
1e18bda8 | 1745 | if (!list_empty(&fi->write_files)) { |
72523425 MS |
1746 | ff = list_entry(fi->write_files.next, struct fuse_file, |
1747 | write_entry); | |
1748 | fuse_file_get(ff); | |
1749 | } | |
f15ecfef | 1750 | spin_unlock(&fi->lock); |
adcadfa8 PE |
1751 | |
1752 | return ff; | |
1753 | } | |
1754 | ||
1e18bda8 MS |
1755 | static struct fuse_file *fuse_write_file_get(struct fuse_conn *fc, |
1756 | struct fuse_inode *fi) | |
1757 | { | |
1758 | struct fuse_file *ff = __fuse_write_file_get(fc, fi); | |
1759 | WARN_ON(!ff); | |
1760 | return ff; | |
1761 | } | |
1762 | ||
1763 | int fuse_write_inode(struct inode *inode, struct writeback_control *wbc) | |
1764 | { | |
1765 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1766 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1767 | struct fuse_file *ff; | |
1768 | int err; | |
1769 | ||
1770 | ff = __fuse_write_file_get(fc, fi); | |
ab9e13f7 | 1771 | err = fuse_flush_times(inode, ff); |
1e18bda8 | 1772 | if (ff) |
2e64ff15 | 1773 | fuse_file_put(ff, false, false); |
1e18bda8 MS |
1774 | |
1775 | return err; | |
1776 | } | |
1777 | ||
33826ebb MS |
1778 | static struct fuse_writepage_args *fuse_writepage_args_alloc(void) |
1779 | { | |
1780 | struct fuse_writepage_args *wpa; | |
1781 | struct fuse_args_pages *ap; | |
1782 | ||
1783 | wpa = kzalloc(sizeof(*wpa), GFP_NOFS); | |
1784 | if (wpa) { | |
1785 | ap = &wpa->ia.ap; | |
1786 | ap->num_pages = 0; | |
1787 | ap->pages = fuse_pages_alloc(1, GFP_NOFS, &ap->descs); | |
1788 | if (!ap->pages) { | |
1789 | kfree(wpa); | |
1790 | wpa = NULL; | |
1791 | } | |
1792 | } | |
1793 | return wpa; | |
1794 | ||
1795 | } | |
1796 | ||
3be5a52b MS |
1797 | static int fuse_writepage_locked(struct page *page) |
1798 | { | |
1799 | struct address_space *mapping = page->mapping; | |
1800 | struct inode *inode = mapping->host; | |
1801 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1802 | struct fuse_inode *fi = get_fuse_inode(inode); | |
33826ebb MS |
1803 | struct fuse_writepage_args *wpa; |
1804 | struct fuse_args_pages *ap; | |
3be5a52b | 1805 | struct page *tmp_page; |
72523425 | 1806 | int error = -ENOMEM; |
3be5a52b MS |
1807 | |
1808 | set_page_writeback(page); | |
1809 | ||
33826ebb MS |
1810 | wpa = fuse_writepage_args_alloc(); |
1811 | if (!wpa) | |
3be5a52b | 1812 | goto err; |
33826ebb | 1813 | ap = &wpa->ia.ap; |
3be5a52b MS |
1814 | |
1815 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1816 | if (!tmp_page) | |
1817 | goto err_free; | |
1818 | ||
72523425 | 1819 | error = -EIO; |
33826ebb MS |
1820 | wpa->ia.ff = fuse_write_file_get(fc, fi); |
1821 | if (!wpa->ia.ff) | |
27f1b363 | 1822 | goto err_nofile; |
72523425 | 1823 | |
33826ebb | 1824 | fuse_write_args_fill(&wpa->ia, wpa->ia.ff, page_offset(page), 0); |
3be5a52b MS |
1825 | |
1826 | copy_highpage(tmp_page, page); | |
33826ebb MS |
1827 | wpa->ia.write.in.write_flags |= FUSE_WRITE_CACHE; |
1828 | wpa->next = NULL; | |
1829 | ap->args.in_pages = true; | |
1830 | ap->num_pages = 1; | |
1831 | ap->pages[0] = tmp_page; | |
1832 | ap->descs[0].offset = 0; | |
1833 | ap->descs[0].length = PAGE_SIZE; | |
1834 | ap->args.end = fuse_writepage_end; | |
1835 | wpa->inode = inode; | |
3be5a52b | 1836 | |
93f78d88 | 1837 | inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); |
11fb9989 | 1838 | inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP); |
3be5a52b | 1839 | |
f15ecfef | 1840 | spin_lock(&fi->lock); |
33826ebb MS |
1841 | list_add(&wpa->writepages_entry, &fi->writepages); |
1842 | list_add_tail(&wpa->queue_entry, &fi->queued_writes); | |
3be5a52b | 1843 | fuse_flush_writepages(inode); |
f15ecfef | 1844 | spin_unlock(&fi->lock); |
3be5a52b | 1845 | |
4a4ac4eb MP |
1846 | end_page_writeback(page); |
1847 | ||
3be5a52b MS |
1848 | return 0; |
1849 | ||
27f1b363 MP |
1850 | err_nofile: |
1851 | __free_page(tmp_page); | |
3be5a52b | 1852 | err_free: |
33826ebb | 1853 | kfree(wpa); |
3be5a52b | 1854 | err: |
9183976e | 1855 | mapping_set_error(page->mapping, error); |
3be5a52b | 1856 | end_page_writeback(page); |
72523425 | 1857 | return error; |
3be5a52b MS |
1858 | } |
1859 | ||
1860 | static int fuse_writepage(struct page *page, struct writeback_control *wbc) | |
1861 | { | |
1862 | int err; | |
1863 | ||
ff17be08 MS |
1864 | if (fuse_page_is_writeback(page->mapping->host, page->index)) { |
1865 | /* | |
1866 | * ->writepages() should be called for sync() and friends. We | |
1867 | * should only get here on direct reclaim and then we are | |
1868 | * allowed to skip a page which is already in flight | |
1869 | */ | |
1870 | WARN_ON(wbc->sync_mode == WB_SYNC_ALL); | |
1871 | ||
1872 | redirty_page_for_writepage(wbc, page); | |
d5880c7a | 1873 | unlock_page(page); |
ff17be08 MS |
1874 | return 0; |
1875 | } | |
1876 | ||
3be5a52b MS |
1877 | err = fuse_writepage_locked(page); |
1878 | unlock_page(page); | |
1879 | ||
1880 | return err; | |
1881 | } | |
1882 | ||
26d614df | 1883 | struct fuse_fill_wb_data { |
33826ebb | 1884 | struct fuse_writepage_args *wpa; |
26d614df PE |
1885 | struct fuse_file *ff; |
1886 | struct inode *inode; | |
2d033eaa | 1887 | struct page **orig_pages; |
33826ebb | 1888 | unsigned int max_pages; |
26d614df PE |
1889 | }; |
1890 | ||
33826ebb MS |
1891 | static bool fuse_pages_realloc(struct fuse_fill_wb_data *data) |
1892 | { | |
1893 | struct fuse_args_pages *ap = &data->wpa->ia.ap; | |
1894 | struct fuse_conn *fc = get_fuse_conn(data->inode); | |
1895 | struct page **pages; | |
1896 | struct fuse_page_desc *descs; | |
1897 | unsigned int npages = min_t(unsigned int, | |
1898 | max_t(unsigned int, data->max_pages * 2, | |
1899 | FUSE_DEFAULT_MAX_PAGES_PER_REQ), | |
1900 | fc->max_pages); | |
1901 | WARN_ON(npages <= data->max_pages); | |
1902 | ||
1903 | pages = fuse_pages_alloc(npages, GFP_NOFS, &descs); | |
1904 | if (!pages) | |
1905 | return false; | |
1906 | ||
1907 | memcpy(pages, ap->pages, sizeof(struct page *) * ap->num_pages); | |
1908 | memcpy(descs, ap->descs, sizeof(struct fuse_page_desc) * ap->num_pages); | |
1909 | kfree(ap->pages); | |
1910 | ap->pages = pages; | |
1911 | ap->descs = descs; | |
1912 | data->max_pages = npages; | |
1913 | ||
1914 | return true; | |
1915 | } | |
1916 | ||
26d614df PE |
1917 | static void fuse_writepages_send(struct fuse_fill_wb_data *data) |
1918 | { | |
33826ebb | 1919 | struct fuse_writepage_args *wpa = data->wpa; |
26d614df | 1920 | struct inode *inode = data->inode; |
26d614df | 1921 | struct fuse_inode *fi = get_fuse_inode(inode); |
33826ebb | 1922 | int num_pages = wpa->ia.ap.num_pages; |
2d033eaa | 1923 | int i; |
26d614df | 1924 | |
33826ebb | 1925 | wpa->ia.ff = fuse_file_get(data->ff); |
f15ecfef | 1926 | spin_lock(&fi->lock); |
33826ebb | 1927 | list_add_tail(&wpa->queue_entry, &fi->queued_writes); |
26d614df | 1928 | fuse_flush_writepages(inode); |
f15ecfef | 1929 | spin_unlock(&fi->lock); |
2d033eaa MP |
1930 | |
1931 | for (i = 0; i < num_pages; i++) | |
1932 | end_page_writeback(data->orig_pages[i]); | |
26d614df PE |
1933 | } |
1934 | ||
7f305ca1 MS |
1935 | /* |
1936 | * First recheck under fi->lock if the offending offset is still under | |
419234d5 MS |
1937 | * writeback. If yes, then iterate auxiliary write requests, to see if there's |
1938 | * one already added for a page at this offset. If there's none, then insert | |
1939 | * this new request onto the auxiliary list, otherwise reuse the existing one by | |
7f305ca1 MS |
1940 | * copying the new page contents over to the old temporary page. |
1941 | */ | |
33826ebb | 1942 | static bool fuse_writepage_in_flight(struct fuse_writepage_args *new_wpa, |
8b284dc4 MS |
1943 | struct page *page) |
1944 | { | |
33826ebb MS |
1945 | struct fuse_inode *fi = get_fuse_inode(new_wpa->inode); |
1946 | struct fuse_writepage_args *tmp; | |
1947 | struct fuse_writepage_args *old_wpa; | |
1948 | struct fuse_args_pages *new_ap = &new_wpa->ia.ap; | |
8b284dc4 | 1949 | |
33826ebb | 1950 | WARN_ON(new_ap->num_pages != 0); |
8b284dc4 | 1951 | |
f15ecfef | 1952 | spin_lock(&fi->lock); |
33826ebb MS |
1953 | list_del(&new_wpa->writepages_entry); |
1954 | old_wpa = fuse_find_writeback(fi, page->index, page->index); | |
1955 | if (!old_wpa) { | |
1956 | list_add(&new_wpa->writepages_entry, &fi->writepages); | |
f15ecfef | 1957 | spin_unlock(&fi->lock); |
2fe93bd4 | 1958 | return false; |
f6011081 | 1959 | } |
8b284dc4 | 1960 | |
33826ebb MS |
1961 | new_ap->num_pages = 1; |
1962 | for (tmp = old_wpa->next; tmp; tmp = tmp->next) { | |
7f305ca1 MS |
1963 | pgoff_t curr_index; |
1964 | ||
33826ebb MS |
1965 | WARN_ON(tmp->inode != new_wpa->inode); |
1966 | curr_index = tmp->ia.write.in.offset >> PAGE_SHIFT; | |
419234d5 | 1967 | if (curr_index == page->index) { |
33826ebb MS |
1968 | WARN_ON(tmp->ia.ap.num_pages != 1); |
1969 | swap(tmp->ia.ap.pages[0], new_ap->pages[0]); | |
7f305ca1 | 1970 | break; |
8b284dc4 MS |
1971 | } |
1972 | } | |
1973 | ||
7f305ca1 | 1974 | if (!tmp) { |
33826ebb MS |
1975 | new_wpa->next = old_wpa->next; |
1976 | old_wpa->next = new_wpa; | |
7f305ca1 | 1977 | } |
41b6e41f | 1978 | |
f15ecfef | 1979 | spin_unlock(&fi->lock); |
7f305ca1 MS |
1980 | |
1981 | if (tmp) { | |
33826ebb | 1982 | struct backing_dev_info *bdi = inode_to_bdi(new_wpa->inode); |
8b284dc4 | 1983 | |
93f78d88 | 1984 | dec_wb_stat(&bdi->wb, WB_WRITEBACK); |
33826ebb | 1985 | dec_node_page_state(new_ap->pages[0], NR_WRITEBACK_TEMP); |
93f78d88 | 1986 | wb_writeout_inc(&bdi->wb); |
33826ebb | 1987 | fuse_writepage_free(new_wpa); |
8b284dc4 | 1988 | } |
7f305ca1 | 1989 | |
2fe93bd4 | 1990 | return true; |
8b284dc4 MS |
1991 | } |
1992 | ||
26d614df PE |
1993 | static int fuse_writepages_fill(struct page *page, |
1994 | struct writeback_control *wbc, void *_data) | |
1995 | { | |
1996 | struct fuse_fill_wb_data *data = _data; | |
33826ebb MS |
1997 | struct fuse_writepage_args *wpa = data->wpa; |
1998 | struct fuse_args_pages *ap = &wpa->ia.ap; | |
26d614df | 1999 | struct inode *inode = data->inode; |
f15ecfef | 2000 | struct fuse_inode *fi = get_fuse_inode(inode); |
26d614df PE |
2001 | struct fuse_conn *fc = get_fuse_conn(inode); |
2002 | struct page *tmp_page; | |
8b284dc4 | 2003 | bool is_writeback; |
26d614df PE |
2004 | int err; |
2005 | ||
2006 | if (!data->ff) { | |
2007 | err = -EIO; | |
091d1a72 | 2008 | data->ff = fuse_write_file_get(fc, fi); |
26d614df PE |
2009 | if (!data->ff) |
2010 | goto out_unlock; | |
2011 | } | |
2012 | ||
8b284dc4 MS |
2013 | /* |
2014 | * Being under writeback is unlikely but possible. For example direct | |
2015 | * read to an mmaped fuse file will set the page dirty twice; once when | |
2016 | * the pages are faulted with get_user_pages(), and then after the read | |
2017 | * completed. | |
2018 | */ | |
2019 | is_writeback = fuse_page_is_writeback(inode, page->index); | |
2020 | ||
33826ebb MS |
2021 | if (wpa && ap->num_pages && |
2022 | (is_writeback || ap->num_pages == fc->max_pages || | |
2023 | (ap->num_pages + 1) * PAGE_SIZE > fc->max_write || | |
2024 | data->orig_pages[ap->num_pages - 1]->index + 1 != page->index)) { | |
8b284dc4 | 2025 | fuse_writepages_send(data); |
33826ebb MS |
2026 | data->wpa = NULL; |
2027 | } else if (wpa && ap->num_pages == data->max_pages) { | |
2028 | if (!fuse_pages_realloc(data)) { | |
e52a8250 | 2029 | fuse_writepages_send(data); |
33826ebb | 2030 | data->wpa = NULL; |
e52a8250 | 2031 | } |
26d614df | 2032 | } |
e52a8250 | 2033 | |
26d614df PE |
2034 | err = -ENOMEM; |
2035 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
2036 | if (!tmp_page) | |
2037 | goto out_unlock; | |
2038 | ||
2039 | /* | |
2040 | * The page must not be redirtied until the writeout is completed | |
2041 | * (i.e. userspace has sent a reply to the write request). Otherwise | |
2042 | * there could be more than one temporary page instance for each real | |
2043 | * page. | |
2044 | * | |
2045 | * This is ensured by holding the page lock in page_mkwrite() while | |
2046 | * checking fuse_page_is_writeback(). We already hold the page lock | |
2047 | * since clear_page_dirty_for_io() and keep it held until we add the | |
33826ebb | 2048 | * request to the fi->writepages list and increment ap->num_pages. |
26d614df PE |
2049 | * After this fuse_page_is_writeback() will indicate that the page is |
2050 | * under writeback, so we can release the page lock. | |
2051 | */ | |
33826ebb | 2052 | if (data->wpa == NULL) { |
26d614df | 2053 | err = -ENOMEM; |
33826ebb MS |
2054 | wpa = fuse_writepage_args_alloc(); |
2055 | if (!wpa) { | |
26d614df PE |
2056 | __free_page(tmp_page); |
2057 | goto out_unlock; | |
2058 | } | |
33826ebb | 2059 | data->max_pages = 1; |
26d614df | 2060 | |
33826ebb MS |
2061 | ap = &wpa->ia.ap; |
2062 | fuse_write_args_fill(&wpa->ia, data->ff, page_offset(page), 0); | |
2063 | wpa->ia.write.in.write_flags |= FUSE_WRITE_CACHE; | |
2064 | wpa->next = NULL; | |
2065 | ap->args.in_pages = true; | |
2066 | ap->args.end = fuse_writepage_end; | |
2067 | ap->num_pages = 0; | |
2068 | wpa->inode = inode; | |
26d614df | 2069 | |
f15ecfef | 2070 | spin_lock(&fi->lock); |
33826ebb | 2071 | list_add(&wpa->writepages_entry, &fi->writepages); |
f15ecfef | 2072 | spin_unlock(&fi->lock); |
26d614df | 2073 | |
33826ebb | 2074 | data->wpa = wpa; |
26d614df PE |
2075 | } |
2076 | set_page_writeback(page); | |
2077 | ||
2078 | copy_highpage(tmp_page, page); | |
33826ebb MS |
2079 | ap->pages[ap->num_pages] = tmp_page; |
2080 | ap->descs[ap->num_pages].offset = 0; | |
2081 | ap->descs[ap->num_pages].length = PAGE_SIZE; | |
26d614df | 2082 | |
93f78d88 | 2083 | inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); |
11fb9989 | 2084 | inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP); |
8b284dc4 MS |
2085 | |
2086 | err = 0; | |
33826ebb | 2087 | if (is_writeback && fuse_writepage_in_flight(wpa, page)) { |
8b284dc4 | 2088 | end_page_writeback(page); |
33826ebb | 2089 | data->wpa = NULL; |
8b284dc4 MS |
2090 | goto out_unlock; |
2091 | } | |
33826ebb | 2092 | data->orig_pages[ap->num_pages] = page; |
26d614df PE |
2093 | |
2094 | /* | |
f15ecfef | 2095 | * Protected by fi->lock against concurrent access by |
26d614df PE |
2096 | * fuse_page_is_writeback(). |
2097 | */ | |
f15ecfef | 2098 | spin_lock(&fi->lock); |
33826ebb | 2099 | ap->num_pages++; |
f15ecfef | 2100 | spin_unlock(&fi->lock); |
26d614df | 2101 | |
26d614df PE |
2102 | out_unlock: |
2103 | unlock_page(page); | |
2104 | ||
2105 | return err; | |
2106 | } | |
2107 | ||
2108 | static int fuse_writepages(struct address_space *mapping, | |
2109 | struct writeback_control *wbc) | |
2110 | { | |
2111 | struct inode *inode = mapping->host; | |
5da784cc | 2112 | struct fuse_conn *fc = get_fuse_conn(inode); |
26d614df PE |
2113 | struct fuse_fill_wb_data data; |
2114 | int err; | |
2115 | ||
2116 | err = -EIO; | |
2117 | if (is_bad_inode(inode)) | |
2118 | goto out; | |
2119 | ||
2120 | data.inode = inode; | |
33826ebb | 2121 | data.wpa = NULL; |
26d614df PE |
2122 | data.ff = NULL; |
2123 | ||
2d033eaa | 2124 | err = -ENOMEM; |
5da784cc | 2125 | data.orig_pages = kcalloc(fc->max_pages, |
f2b3455e | 2126 | sizeof(struct page *), |
2d033eaa MP |
2127 | GFP_NOFS); |
2128 | if (!data.orig_pages) | |
2129 | goto out; | |
2130 | ||
26d614df | 2131 | err = write_cache_pages(mapping, wbc, fuse_writepages_fill, &data); |
33826ebb | 2132 | if (data.wpa) { |
26d614df | 2133 | /* Ignore errors if we can write at least one page */ |
33826ebb | 2134 | WARN_ON(!data.wpa->ia.ap.num_pages); |
26d614df PE |
2135 | fuse_writepages_send(&data); |
2136 | err = 0; | |
2137 | } | |
2138 | if (data.ff) | |
2e64ff15 | 2139 | fuse_file_put(data.ff, false, false); |
2d033eaa MP |
2140 | |
2141 | kfree(data.orig_pages); | |
26d614df PE |
2142 | out: |
2143 | return err; | |
2144 | } | |
2145 | ||
6b12c1b3 PE |
2146 | /* |
2147 | * It's worthy to make sure that space is reserved on disk for the write, | |
2148 | * but how to implement it without killing performance need more thinking. | |
2149 | */ | |
2150 | static int fuse_write_begin(struct file *file, struct address_space *mapping, | |
2151 | loff_t pos, unsigned len, unsigned flags, | |
2152 | struct page **pagep, void **fsdata) | |
2153 | { | |
09cbfeaf | 2154 | pgoff_t index = pos >> PAGE_SHIFT; |
a455589f | 2155 | struct fuse_conn *fc = get_fuse_conn(file_inode(file)); |
6b12c1b3 PE |
2156 | struct page *page; |
2157 | loff_t fsize; | |
2158 | int err = -ENOMEM; | |
2159 | ||
2160 | WARN_ON(!fc->writeback_cache); | |
2161 | ||
2162 | page = grab_cache_page_write_begin(mapping, index, flags); | |
2163 | if (!page) | |
2164 | goto error; | |
2165 | ||
2166 | fuse_wait_on_page_writeback(mapping->host, page->index); | |
2167 | ||
09cbfeaf | 2168 | if (PageUptodate(page) || len == PAGE_SIZE) |
6b12c1b3 PE |
2169 | goto success; |
2170 | /* | |
2171 | * Check if the start this page comes after the end of file, in which | |
2172 | * case the readpage can be optimized away. | |
2173 | */ | |
2174 | fsize = i_size_read(mapping->host); | |
09cbfeaf KS |
2175 | if (fsize <= (pos & PAGE_MASK)) { |
2176 | size_t off = pos & ~PAGE_MASK; | |
6b12c1b3 PE |
2177 | if (off) |
2178 | zero_user_segment(page, 0, off); | |
2179 | goto success; | |
2180 | } | |
2181 | err = fuse_do_readpage(file, page); | |
2182 | if (err) | |
2183 | goto cleanup; | |
2184 | success: | |
2185 | *pagep = page; | |
2186 | return 0; | |
2187 | ||
2188 | cleanup: | |
2189 | unlock_page(page); | |
09cbfeaf | 2190 | put_page(page); |
6b12c1b3 PE |
2191 | error: |
2192 | return err; | |
2193 | } | |
2194 | ||
2195 | static int fuse_write_end(struct file *file, struct address_space *mapping, | |
2196 | loff_t pos, unsigned len, unsigned copied, | |
2197 | struct page *page, void *fsdata) | |
2198 | { | |
2199 | struct inode *inode = page->mapping->host; | |
2200 | ||
59c3b76c MS |
2201 | /* Haven't copied anything? Skip zeroing, size extending, dirtying. */ |
2202 | if (!copied) | |
2203 | goto unlock; | |
2204 | ||
6b12c1b3 PE |
2205 | if (!PageUptodate(page)) { |
2206 | /* Zero any unwritten bytes at the end of the page */ | |
09cbfeaf | 2207 | size_t endoff = (pos + copied) & ~PAGE_MASK; |
6b12c1b3 | 2208 | if (endoff) |
09cbfeaf | 2209 | zero_user_segment(page, endoff, PAGE_SIZE); |
6b12c1b3 PE |
2210 | SetPageUptodate(page); |
2211 | } | |
2212 | ||
2213 | fuse_write_update_size(inode, pos + copied); | |
2214 | set_page_dirty(page); | |
59c3b76c MS |
2215 | |
2216 | unlock: | |
6b12c1b3 | 2217 | unlock_page(page); |
09cbfeaf | 2218 | put_page(page); |
6b12c1b3 PE |
2219 | |
2220 | return copied; | |
2221 | } | |
2222 | ||
3be5a52b MS |
2223 | static int fuse_launder_page(struct page *page) |
2224 | { | |
2225 | int err = 0; | |
2226 | if (clear_page_dirty_for_io(page)) { | |
2227 | struct inode *inode = page->mapping->host; | |
2228 | err = fuse_writepage_locked(page); | |
2229 | if (!err) | |
2230 | fuse_wait_on_page_writeback(inode, page->index); | |
2231 | } | |
2232 | return err; | |
2233 | } | |
2234 | ||
2235 | /* | |
2236 | * Write back dirty pages now, because there may not be any suitable | |
2237 | * open files later | |
2238 | */ | |
2239 | static void fuse_vma_close(struct vm_area_struct *vma) | |
2240 | { | |
2241 | filemap_write_and_wait(vma->vm_file->f_mapping); | |
2242 | } | |
2243 | ||
2244 | /* | |
2245 | * Wait for writeback against this page to complete before allowing it | |
2246 | * to be marked dirty again, and hence written back again, possibly | |
2247 | * before the previous writepage completed. | |
2248 | * | |
2249 | * Block here, instead of in ->writepage(), so that the userspace fs | |
2250 | * can only block processes actually operating on the filesystem. | |
2251 | * | |
2252 | * Otherwise unprivileged userspace fs would be able to block | |
2253 | * unrelated: | |
2254 | * | |
2255 | * - page migration | |
2256 | * - sync(2) | |
2257 | * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER | |
2258 | */ | |
46fb504a | 2259 | static vm_fault_t fuse_page_mkwrite(struct vm_fault *vmf) |
3be5a52b | 2260 | { |
c2ec175c | 2261 | struct page *page = vmf->page; |
11bac800 | 2262 | struct inode *inode = file_inode(vmf->vma->vm_file); |
cca24370 | 2263 | |
11bac800 | 2264 | file_update_time(vmf->vma->vm_file); |
cca24370 MS |
2265 | lock_page(page); |
2266 | if (page->mapping != inode->i_mapping) { | |
2267 | unlock_page(page); | |
2268 | return VM_FAULT_NOPAGE; | |
2269 | } | |
3be5a52b MS |
2270 | |
2271 | fuse_wait_on_page_writeback(inode, page->index); | |
cca24370 | 2272 | return VM_FAULT_LOCKED; |
3be5a52b MS |
2273 | } |
2274 | ||
f0f37e2f | 2275 | static const struct vm_operations_struct fuse_file_vm_ops = { |
3be5a52b MS |
2276 | .close = fuse_vma_close, |
2277 | .fault = filemap_fault, | |
f1820361 | 2278 | .map_pages = filemap_map_pages, |
3be5a52b MS |
2279 | .page_mkwrite = fuse_page_mkwrite, |
2280 | }; | |
2281 | ||
2282 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) | |
2283 | { | |
55752a3a MS |
2284 | struct fuse_file *ff = file->private_data; |
2285 | ||
2286 | if (ff->open_flags & FOPEN_DIRECT_IO) { | |
2287 | /* Can't provide the coherency needed for MAP_SHARED */ | |
2288 | if (vma->vm_flags & VM_MAYSHARE) | |
2289 | return -ENODEV; | |
2290 | ||
2291 | invalidate_inode_pages2(file->f_mapping); | |
2292 | ||
2293 | return generic_file_mmap(file, vma); | |
2294 | } | |
2295 | ||
650b22b9 PE |
2296 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) |
2297 | fuse_link_write_file(file); | |
2298 | ||
3be5a52b MS |
2299 | file_accessed(file); |
2300 | vma->vm_ops = &fuse_file_vm_ops; | |
b6aeaded MS |
2301 | return 0; |
2302 | } | |
2303 | ||
0b6e9ea0 SF |
2304 | static int convert_fuse_file_lock(struct fuse_conn *fc, |
2305 | const struct fuse_file_lock *ffl, | |
71421259 MS |
2306 | struct file_lock *fl) |
2307 | { | |
2308 | switch (ffl->type) { | |
2309 | case F_UNLCK: | |
2310 | break; | |
2311 | ||
2312 | case F_RDLCK: | |
2313 | case F_WRLCK: | |
2314 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
2315 | ffl->end < ffl->start) | |
2316 | return -EIO; | |
2317 | ||
2318 | fl->fl_start = ffl->start; | |
2319 | fl->fl_end = ffl->end; | |
0b6e9ea0 SF |
2320 | |
2321 | /* | |
9d5b86ac BC |
2322 | * Convert pid into init's pid namespace. The locks API will |
2323 | * translate it into the caller's pid namespace. | |
0b6e9ea0 SF |
2324 | */ |
2325 | rcu_read_lock(); | |
9d5b86ac | 2326 | fl->fl_pid = pid_nr_ns(find_pid_ns(ffl->pid, fc->pid_ns), &init_pid_ns); |
0b6e9ea0 | 2327 | rcu_read_unlock(); |
71421259 MS |
2328 | break; |
2329 | ||
2330 | default: | |
2331 | return -EIO; | |
2332 | } | |
2333 | fl->fl_type = ffl->type; | |
2334 | return 0; | |
2335 | } | |
2336 | ||
7078187a | 2337 | static void fuse_lk_fill(struct fuse_args *args, struct file *file, |
a9ff4f87 | 2338 | const struct file_lock *fl, int opcode, pid_t pid, |
7078187a | 2339 | int flock, struct fuse_lk_in *inarg) |
71421259 | 2340 | { |
6131ffaa | 2341 | struct inode *inode = file_inode(file); |
9c8ef561 | 2342 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 | 2343 | struct fuse_file *ff = file->private_data; |
7078187a MS |
2344 | |
2345 | memset(inarg, 0, sizeof(*inarg)); | |
2346 | inarg->fh = ff->fh; | |
2347 | inarg->owner = fuse_lock_owner_id(fc, fl->fl_owner); | |
2348 | inarg->lk.start = fl->fl_start; | |
2349 | inarg->lk.end = fl->fl_end; | |
2350 | inarg->lk.type = fl->fl_type; | |
2351 | inarg->lk.pid = pid; | |
a9ff4f87 | 2352 | if (flock) |
7078187a | 2353 | inarg->lk_flags |= FUSE_LK_FLOCK; |
d5b48543 MS |
2354 | args->opcode = opcode; |
2355 | args->nodeid = get_node_id(inode); | |
2356 | args->in_numargs = 1; | |
2357 | args->in_args[0].size = sizeof(*inarg); | |
2358 | args->in_args[0].value = inarg; | |
71421259 MS |
2359 | } |
2360 | ||
2361 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
2362 | { | |
6131ffaa | 2363 | struct inode *inode = file_inode(file); |
71421259 | 2364 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a MS |
2365 | FUSE_ARGS(args); |
2366 | struct fuse_lk_in inarg; | |
71421259 MS |
2367 | struct fuse_lk_out outarg; |
2368 | int err; | |
2369 | ||
7078187a | 2370 | fuse_lk_fill(&args, file, fl, FUSE_GETLK, 0, 0, &inarg); |
d5b48543 MS |
2371 | args.out_numargs = 1; |
2372 | args.out_args[0].size = sizeof(outarg); | |
2373 | args.out_args[0].value = &outarg; | |
7078187a | 2374 | err = fuse_simple_request(fc, &args); |
71421259 | 2375 | if (!err) |
0b6e9ea0 | 2376 | err = convert_fuse_file_lock(fc, &outarg.lk, fl); |
71421259 MS |
2377 | |
2378 | return err; | |
2379 | } | |
2380 | ||
a9ff4f87 | 2381 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 2382 | { |
6131ffaa | 2383 | struct inode *inode = file_inode(file); |
71421259 | 2384 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a MS |
2385 | FUSE_ARGS(args); |
2386 | struct fuse_lk_in inarg; | |
71421259 | 2387 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; |
0b6e9ea0 SF |
2388 | struct pid *pid = fl->fl_type != F_UNLCK ? task_tgid(current) : NULL; |
2389 | pid_t pid_nr = pid_nr_ns(pid, fc->pid_ns); | |
71421259 MS |
2390 | int err; |
2391 | ||
8fb47a4f | 2392 | if (fl->fl_lmops && fl->fl_lmops->lm_grant) { |
48e90761 MS |
2393 | /* NLM needs asynchronous locks, which we don't support yet */ |
2394 | return -ENOLCK; | |
2395 | } | |
2396 | ||
71421259 | 2397 | /* Unlock on close is handled by the flush method */ |
50f2112c | 2398 | if ((fl->fl_flags & FL_CLOSE_POSIX) == FL_CLOSE_POSIX) |
71421259 MS |
2399 | return 0; |
2400 | ||
0b6e9ea0 | 2401 | fuse_lk_fill(&args, file, fl, opcode, pid_nr, flock, &inarg); |
7078187a | 2402 | err = fuse_simple_request(fc, &args); |
71421259 | 2403 | |
a4d27e75 MS |
2404 | /* locking is restartable */ |
2405 | if (err == -EINTR) | |
2406 | err = -ERESTARTSYS; | |
7078187a | 2407 | |
71421259 MS |
2408 | return err; |
2409 | } | |
2410 | ||
2411 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
2412 | { | |
6131ffaa | 2413 | struct inode *inode = file_inode(file); |
71421259 MS |
2414 | struct fuse_conn *fc = get_fuse_conn(inode); |
2415 | int err; | |
2416 | ||
48e90761 MS |
2417 | if (cmd == F_CANCELLK) { |
2418 | err = 0; | |
2419 | } else if (cmd == F_GETLK) { | |
71421259 | 2420 | if (fc->no_lock) { |
9d6a8c5c | 2421 | posix_test_lock(file, fl); |
71421259 MS |
2422 | err = 0; |
2423 | } else | |
2424 | err = fuse_getlk(file, fl); | |
2425 | } else { | |
2426 | if (fc->no_lock) | |
48e90761 | 2427 | err = posix_lock_file(file, fl, NULL); |
71421259 | 2428 | else |
a9ff4f87 | 2429 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
2430 | } |
2431 | return err; | |
2432 | } | |
2433 | ||
a9ff4f87 MS |
2434 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
2435 | { | |
6131ffaa | 2436 | struct inode *inode = file_inode(file); |
a9ff4f87 MS |
2437 | struct fuse_conn *fc = get_fuse_conn(inode); |
2438 | int err; | |
2439 | ||
37fb3a30 | 2440 | if (fc->no_flock) { |
4f656367 | 2441 | err = locks_lock_file_wait(file, fl); |
a9ff4f87 | 2442 | } else { |
37fb3a30 MS |
2443 | struct fuse_file *ff = file->private_data; |
2444 | ||
a9ff4f87 | 2445 | /* emulate flock with POSIX locks */ |
37fb3a30 | 2446 | ff->flock = true; |
a9ff4f87 MS |
2447 | err = fuse_setlk(file, fl, 1); |
2448 | } | |
2449 | ||
2450 | return err; | |
2451 | } | |
2452 | ||
b2d2272f MS |
2453 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
2454 | { | |
2455 | struct inode *inode = mapping->host; | |
2456 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 2457 | FUSE_ARGS(args); |
b2d2272f MS |
2458 | struct fuse_bmap_in inarg; |
2459 | struct fuse_bmap_out outarg; | |
2460 | int err; | |
2461 | ||
2462 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
2463 | return 0; | |
2464 | ||
b2d2272f MS |
2465 | memset(&inarg, 0, sizeof(inarg)); |
2466 | inarg.block = block; | |
2467 | inarg.blocksize = inode->i_sb->s_blocksize; | |
d5b48543 MS |
2468 | args.opcode = FUSE_BMAP; |
2469 | args.nodeid = get_node_id(inode); | |
2470 | args.in_numargs = 1; | |
2471 | args.in_args[0].size = sizeof(inarg); | |
2472 | args.in_args[0].value = &inarg; | |
2473 | args.out_numargs = 1; | |
2474 | args.out_args[0].size = sizeof(outarg); | |
2475 | args.out_args[0].value = &outarg; | |
7078187a | 2476 | err = fuse_simple_request(fc, &args); |
b2d2272f MS |
2477 | if (err == -ENOSYS) |
2478 | fc->no_bmap = 1; | |
2479 | ||
2480 | return err ? 0 : outarg.block; | |
2481 | } | |
2482 | ||
0b5da8db R |
2483 | static loff_t fuse_lseek(struct file *file, loff_t offset, int whence) |
2484 | { | |
2485 | struct inode *inode = file->f_mapping->host; | |
2486 | struct fuse_conn *fc = get_fuse_conn(inode); | |
2487 | struct fuse_file *ff = file->private_data; | |
2488 | FUSE_ARGS(args); | |
2489 | struct fuse_lseek_in inarg = { | |
2490 | .fh = ff->fh, | |
2491 | .offset = offset, | |
2492 | .whence = whence | |
2493 | }; | |
2494 | struct fuse_lseek_out outarg; | |
2495 | int err; | |
2496 | ||
2497 | if (fc->no_lseek) | |
2498 | goto fallback; | |
2499 | ||
d5b48543 MS |
2500 | args.opcode = FUSE_LSEEK; |
2501 | args.nodeid = ff->nodeid; | |
2502 | args.in_numargs = 1; | |
2503 | args.in_args[0].size = sizeof(inarg); | |
2504 | args.in_args[0].value = &inarg; | |
2505 | args.out_numargs = 1; | |
2506 | args.out_args[0].size = sizeof(outarg); | |
2507 | args.out_args[0].value = &outarg; | |
0b5da8db R |
2508 | err = fuse_simple_request(fc, &args); |
2509 | if (err) { | |
2510 | if (err == -ENOSYS) { | |
2511 | fc->no_lseek = 1; | |
2512 | goto fallback; | |
2513 | } | |
2514 | return err; | |
2515 | } | |
2516 | ||
2517 | return vfs_setpos(file, outarg.offset, inode->i_sb->s_maxbytes); | |
2518 | ||
2519 | fallback: | |
5b97eeac | 2520 | err = fuse_update_attributes(inode, file); |
0b5da8db R |
2521 | if (!err) |
2522 | return generic_file_llseek(file, offset, whence); | |
2523 | else | |
2524 | return err; | |
2525 | } | |
2526 | ||
965c8e59 | 2527 | static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence) |
5559b8f4 MS |
2528 | { |
2529 | loff_t retval; | |
6131ffaa | 2530 | struct inode *inode = file_inode(file); |
5559b8f4 | 2531 | |
0b5da8db R |
2532 | switch (whence) { |
2533 | case SEEK_SET: | |
2534 | case SEEK_CUR: | |
2535 | /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */ | |
965c8e59 | 2536 | retval = generic_file_llseek(file, offset, whence); |
0b5da8db R |
2537 | break; |
2538 | case SEEK_END: | |
5955102c | 2539 | inode_lock(inode); |
5b97eeac | 2540 | retval = fuse_update_attributes(inode, file); |
0b5da8db R |
2541 | if (!retval) |
2542 | retval = generic_file_llseek(file, offset, whence); | |
5955102c | 2543 | inode_unlock(inode); |
0b5da8db R |
2544 | break; |
2545 | case SEEK_HOLE: | |
2546 | case SEEK_DATA: | |
5955102c | 2547 | inode_lock(inode); |
0b5da8db | 2548 | retval = fuse_lseek(file, offset, whence); |
5955102c | 2549 | inode_unlock(inode); |
0b5da8db R |
2550 | break; |
2551 | default: | |
2552 | retval = -EINVAL; | |
2553 | } | |
c07c3d19 | 2554 | |
5559b8f4 MS |
2555 | return retval; |
2556 | } | |
2557 | ||
d9d318d3 MS |
2558 | /* |
2559 | * CUSE servers compiled on 32bit broke on 64bit kernels because the | |
2560 | * ABI was defined to be 'struct iovec' which is different on 32bit | |
2561 | * and 64bit. Fortunately we can determine which structure the server | |
2562 | * used from the size of the reply. | |
2563 | */ | |
1baa26b2 MS |
2564 | static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, |
2565 | size_t transferred, unsigned count, | |
2566 | bool is_compat) | |
d9d318d3 MS |
2567 | { |
2568 | #ifdef CONFIG_COMPAT | |
2569 | if (count * sizeof(struct compat_iovec) == transferred) { | |
2570 | struct compat_iovec *ciov = src; | |
2571 | unsigned i; | |
2572 | ||
2573 | /* | |
2574 | * With this interface a 32bit server cannot support | |
2575 | * non-compat (i.e. ones coming from 64bit apps) ioctl | |
2576 | * requests | |
2577 | */ | |
2578 | if (!is_compat) | |
2579 | return -EINVAL; | |
2580 | ||
2581 | for (i = 0; i < count; i++) { | |
2582 | dst[i].iov_base = compat_ptr(ciov[i].iov_base); | |
2583 | dst[i].iov_len = ciov[i].iov_len; | |
2584 | } | |
2585 | return 0; | |
2586 | } | |
2587 | #endif | |
2588 | ||
2589 | if (count * sizeof(struct iovec) != transferred) | |
2590 | return -EIO; | |
2591 | ||
2592 | memcpy(dst, src, transferred); | |
2593 | return 0; | |
2594 | } | |
2595 | ||
7572777e | 2596 | /* Make sure iov_length() won't overflow */ |
5da784cc CS |
2597 | static int fuse_verify_ioctl_iov(struct fuse_conn *fc, struct iovec *iov, |
2598 | size_t count) | |
7572777e MS |
2599 | { |
2600 | size_t n; | |
5da784cc | 2601 | u32 max = fc->max_pages << PAGE_SHIFT; |
7572777e | 2602 | |
fb6ccff6 | 2603 | for (n = 0; n < count; n++, iov++) { |
7572777e MS |
2604 | if (iov->iov_len > (size_t) max) |
2605 | return -ENOMEM; | |
2606 | max -= iov->iov_len; | |
2607 | } | |
2608 | return 0; | |
2609 | } | |
2610 | ||
1baa26b2 MS |
2611 | static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, |
2612 | void *src, size_t transferred, unsigned count, | |
2613 | bool is_compat) | |
2614 | { | |
2615 | unsigned i; | |
2616 | struct fuse_ioctl_iovec *fiov = src; | |
2617 | ||
2618 | if (fc->minor < 16) { | |
2619 | return fuse_copy_ioctl_iovec_old(dst, src, transferred, | |
2620 | count, is_compat); | |
2621 | } | |
2622 | ||
2623 | if (count * sizeof(struct fuse_ioctl_iovec) != transferred) | |
2624 | return -EIO; | |
2625 | ||
2626 | for (i = 0; i < count; i++) { | |
2627 | /* Did the server supply an inappropriate value? */ | |
2628 | if (fiov[i].base != (unsigned long) fiov[i].base || | |
2629 | fiov[i].len != (unsigned long) fiov[i].len) | |
2630 | return -EIO; | |
2631 | ||
2632 | dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; | |
2633 | dst[i].iov_len = (size_t) fiov[i].len; | |
2634 | ||
2635 | #ifdef CONFIG_COMPAT | |
2636 | if (is_compat && | |
2637 | (ptr_to_compat(dst[i].iov_base) != fiov[i].base || | |
2638 | (compat_size_t) dst[i].iov_len != fiov[i].len)) | |
2639 | return -EIO; | |
2640 | #endif | |
2641 | } | |
2642 | ||
2643 | return 0; | |
2644 | } | |
2645 | ||
2646 | ||
59efec7b TH |
2647 | /* |
2648 | * For ioctls, there is no generic way to determine how much memory | |
2649 | * needs to be read and/or written. Furthermore, ioctls are allowed | |
2650 | * to dereference the passed pointer, so the parameter requires deep | |
2651 | * copying but FUSE has no idea whatsoever about what to copy in or | |
2652 | * out. | |
2653 | * | |
2654 | * This is solved by allowing FUSE server to retry ioctl with | |
2655 | * necessary in/out iovecs. Let's assume the ioctl implementation | |
2656 | * needs to read in the following structure. | |
2657 | * | |
2658 | * struct a { | |
2659 | * char *buf; | |
2660 | * size_t buflen; | |
2661 | * } | |
2662 | * | |
2663 | * On the first callout to FUSE server, inarg->in_size and | |
2664 | * inarg->out_size will be NULL; then, the server completes the ioctl | |
2665 | * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and | |
2666 | * the actual iov array to | |
2667 | * | |
2668 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } | |
2669 | * | |
2670 | * which tells FUSE to copy in the requested area and retry the ioctl. | |
2671 | * On the second round, the server has access to the structure and | |
2672 | * from that it can tell what to look for next, so on the invocation, | |
2673 | * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to | |
2674 | * | |
2675 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, | |
2676 | * { .iov_base = a.buf, .iov_len = a.buflen } } | |
2677 | * | |
2678 | * FUSE will copy both struct a and the pointed buffer from the | |
2679 | * process doing the ioctl and retry ioctl with both struct a and the | |
2680 | * buffer. | |
2681 | * | |
2682 | * This time, FUSE server has everything it needs and completes ioctl | |
2683 | * without FUSE_IOCTL_RETRY which finishes the ioctl call. | |
2684 | * | |
2685 | * Copying data out works the same way. | |
2686 | * | |
2687 | * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel | |
2688 | * automatically initializes in and out iovs by decoding @cmd with | |
2689 | * _IOC_* macros and the server is not allowed to request RETRY. This | |
2690 | * limits ioctl data transfers to well-formed ioctls and is the forced | |
2691 | * behavior for all FUSE servers. | |
2692 | */ | |
08cbf542 TH |
2693 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
2694 | unsigned int flags) | |
59efec7b | 2695 | { |
59efec7b | 2696 | struct fuse_file *ff = file->private_data; |
d36f2487 | 2697 | struct fuse_conn *fc = ff->fc; |
59efec7b TH |
2698 | struct fuse_ioctl_in inarg = { |
2699 | .fh = ff->fh, | |
2700 | .cmd = cmd, | |
2701 | .arg = arg, | |
2702 | .flags = flags | |
2703 | }; | |
2704 | struct fuse_ioctl_out outarg; | |
8ac83505 | 2705 | struct iovec *iov_page = NULL; |
59efec7b | 2706 | struct iovec *in_iov = NULL, *out_iov = NULL; |
093f38a2 MS |
2707 | unsigned int in_iovs = 0, out_iovs = 0, max_pages; |
2708 | size_t in_size, out_size, c; | |
2709 | ssize_t transferred; | |
acbe5fda MS |
2710 | int err, i; |
2711 | struct iov_iter ii; | |
093f38a2 | 2712 | struct fuse_args_pages ap = {}; |
59efec7b | 2713 | |
1baa26b2 MS |
2714 | #if BITS_PER_LONG == 32 |
2715 | inarg.flags |= FUSE_IOCTL_32BIT; | |
2716 | #else | |
6407f44a | 2717 | if (flags & FUSE_IOCTL_COMPAT) { |
1baa26b2 | 2718 | inarg.flags |= FUSE_IOCTL_32BIT; |
6407f44a IA |
2719 | #ifdef CONFIG_X86_X32 |
2720 | if (in_x32_syscall()) | |
2721 | inarg.flags |= FUSE_IOCTL_COMPAT_X32; | |
2722 | #endif | |
2723 | } | |
1baa26b2 MS |
2724 | #endif |
2725 | ||
59efec7b | 2726 | /* assume all the iovs returned by client always fits in a page */ |
1baa26b2 | 2727 | BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); |
59efec7b | 2728 | |
59efec7b | 2729 | err = -ENOMEM; |
093f38a2 | 2730 | ap.pages = fuse_pages_alloc(fc->max_pages, GFP_KERNEL, &ap.descs); |
8ac83505 | 2731 | iov_page = (struct iovec *) __get_free_page(GFP_KERNEL); |
093f38a2 | 2732 | if (!ap.pages || !iov_page) |
59efec7b TH |
2733 | goto out; |
2734 | ||
093f38a2 MS |
2735 | fuse_page_descs_length_init(ap.descs, 0, fc->max_pages); |
2736 | ||
59efec7b TH |
2737 | /* |
2738 | * If restricted, initialize IO parameters as encoded in @cmd. | |
2739 | * RETRY from server is not allowed. | |
2740 | */ | |
2741 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { | |
8ac83505 | 2742 | struct iovec *iov = iov_page; |
59efec7b | 2743 | |
c9f0523d | 2744 | iov->iov_base = (void __user *)arg; |
59efec7b TH |
2745 | iov->iov_len = _IOC_SIZE(cmd); |
2746 | ||
2747 | if (_IOC_DIR(cmd) & _IOC_WRITE) { | |
2748 | in_iov = iov; | |
2749 | in_iovs = 1; | |
2750 | } | |
2751 | ||
2752 | if (_IOC_DIR(cmd) & _IOC_READ) { | |
2753 | out_iov = iov; | |
2754 | out_iovs = 1; | |
2755 | } | |
2756 | } | |
2757 | ||
2758 | retry: | |
2759 | inarg.in_size = in_size = iov_length(in_iov, in_iovs); | |
2760 | inarg.out_size = out_size = iov_length(out_iov, out_iovs); | |
2761 | ||
2762 | /* | |
2763 | * Out data can be used either for actual out data or iovs, | |
2764 | * make sure there always is at least one page. | |
2765 | */ | |
2766 | out_size = max_t(size_t, out_size, PAGE_SIZE); | |
2767 | max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); | |
2768 | ||
2769 | /* make sure there are enough buffer pages and init request with them */ | |
2770 | err = -ENOMEM; | |
5da784cc | 2771 | if (max_pages > fc->max_pages) |
59efec7b | 2772 | goto out; |
093f38a2 MS |
2773 | while (ap.num_pages < max_pages) { |
2774 | ap.pages[ap.num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); | |
2775 | if (!ap.pages[ap.num_pages]) | |
59efec7b | 2776 | goto out; |
093f38a2 | 2777 | ap.num_pages++; |
59efec7b TH |
2778 | } |
2779 | ||
59efec7b TH |
2780 | |
2781 | /* okay, let's send it to the client */ | |
093f38a2 MS |
2782 | ap.args.opcode = FUSE_IOCTL; |
2783 | ap.args.nodeid = ff->nodeid; | |
2784 | ap.args.in_numargs = 1; | |
2785 | ap.args.in_args[0].size = sizeof(inarg); | |
2786 | ap.args.in_args[0].value = &inarg; | |
59efec7b | 2787 | if (in_size) { |
093f38a2 MS |
2788 | ap.args.in_numargs++; |
2789 | ap.args.in_args[1].size = in_size; | |
2790 | ap.args.in_pages = true; | |
59efec7b | 2791 | |
acbe5fda MS |
2792 | err = -EFAULT; |
2793 | iov_iter_init(&ii, WRITE, in_iov, in_iovs, in_size); | |
093f38a2 MS |
2794 | for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) { |
2795 | c = copy_page_from_iter(ap.pages[i], 0, PAGE_SIZE, &ii); | |
acbe5fda MS |
2796 | if (c != PAGE_SIZE && iov_iter_count(&ii)) |
2797 | goto out; | |
2798 | } | |
59efec7b TH |
2799 | } |
2800 | ||
093f38a2 MS |
2801 | ap.args.out_numargs = 2; |
2802 | ap.args.out_args[0].size = sizeof(outarg); | |
2803 | ap.args.out_args[0].value = &outarg; | |
2804 | ap.args.out_args[1].size = out_size; | |
2805 | ap.args.out_pages = true; | |
2806 | ap.args.out_argvar = true; | |
59efec7b | 2807 | |
093f38a2 MS |
2808 | transferred = fuse_simple_request(fc, &ap.args); |
2809 | err = transferred; | |
2810 | if (transferred < 0) | |
59efec7b TH |
2811 | goto out; |
2812 | ||
2813 | /* did it ask for retry? */ | |
2814 | if (outarg.flags & FUSE_IOCTL_RETRY) { | |
8ac83505 | 2815 | void *vaddr; |
59efec7b TH |
2816 | |
2817 | /* no retry if in restricted mode */ | |
2818 | err = -EIO; | |
2819 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) | |
2820 | goto out; | |
2821 | ||
2822 | in_iovs = outarg.in_iovs; | |
2823 | out_iovs = outarg.out_iovs; | |
2824 | ||
2825 | /* | |
2826 | * Make sure things are in boundary, separate checks | |
2827 | * are to protect against overflow. | |
2828 | */ | |
2829 | err = -ENOMEM; | |
2830 | if (in_iovs > FUSE_IOCTL_MAX_IOV || | |
2831 | out_iovs > FUSE_IOCTL_MAX_IOV || | |
2832 | in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) | |
2833 | goto out; | |
2834 | ||
093f38a2 | 2835 | vaddr = kmap_atomic(ap.pages[0]); |
1baa26b2 | 2836 | err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr, |
d9d318d3 MS |
2837 | transferred, in_iovs + out_iovs, |
2838 | (flags & FUSE_IOCTL_COMPAT) != 0); | |
2408f6ef | 2839 | kunmap_atomic(vaddr); |
d9d318d3 MS |
2840 | if (err) |
2841 | goto out; | |
59efec7b | 2842 | |
8ac83505 | 2843 | in_iov = iov_page; |
59efec7b TH |
2844 | out_iov = in_iov + in_iovs; |
2845 | ||
5da784cc | 2846 | err = fuse_verify_ioctl_iov(fc, in_iov, in_iovs); |
7572777e MS |
2847 | if (err) |
2848 | goto out; | |
2849 | ||
5da784cc | 2850 | err = fuse_verify_ioctl_iov(fc, out_iov, out_iovs); |
7572777e MS |
2851 | if (err) |
2852 | goto out; | |
2853 | ||
59efec7b TH |
2854 | goto retry; |
2855 | } | |
2856 | ||
2857 | err = -EIO; | |
2858 | if (transferred > inarg.out_size) | |
2859 | goto out; | |
2860 | ||
acbe5fda MS |
2861 | err = -EFAULT; |
2862 | iov_iter_init(&ii, READ, out_iov, out_iovs, transferred); | |
093f38a2 MS |
2863 | for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= ap.num_pages); i++) { |
2864 | c = copy_page_to_iter(ap.pages[i], 0, PAGE_SIZE, &ii); | |
acbe5fda MS |
2865 | if (c != PAGE_SIZE && iov_iter_count(&ii)) |
2866 | goto out; | |
2867 | } | |
2868 | err = 0; | |
59efec7b | 2869 | out: |
8ac83505 | 2870 | free_page((unsigned long) iov_page); |
093f38a2 MS |
2871 | while (ap.num_pages) |
2872 | __free_page(ap.pages[--ap.num_pages]); | |
2873 | kfree(ap.pages); | |
59efec7b TH |
2874 | |
2875 | return err ? err : outarg.result; | |
2876 | } | |
08cbf542 | 2877 | EXPORT_SYMBOL_GPL(fuse_do_ioctl); |
59efec7b | 2878 | |
b18da0c5 MS |
2879 | long fuse_ioctl_common(struct file *file, unsigned int cmd, |
2880 | unsigned long arg, unsigned int flags) | |
d36f2487 | 2881 | { |
6131ffaa | 2882 | struct inode *inode = file_inode(file); |
d36f2487 MS |
2883 | struct fuse_conn *fc = get_fuse_conn(inode); |
2884 | ||
c2132c1b | 2885 | if (!fuse_allow_current_process(fc)) |
d36f2487 MS |
2886 | return -EACCES; |
2887 | ||
2888 | if (is_bad_inode(inode)) | |
2889 | return -EIO; | |
2890 | ||
2891 | return fuse_do_ioctl(file, cmd, arg, flags); | |
2892 | } | |
2893 | ||
59efec7b TH |
2894 | static long fuse_file_ioctl(struct file *file, unsigned int cmd, |
2895 | unsigned long arg) | |
2896 | { | |
b18da0c5 | 2897 | return fuse_ioctl_common(file, cmd, arg, 0); |
59efec7b TH |
2898 | } |
2899 | ||
2900 | static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, | |
2901 | unsigned long arg) | |
2902 | { | |
b18da0c5 | 2903 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); |
59efec7b TH |
2904 | } |
2905 | ||
95668a69 TH |
2906 | /* |
2907 | * All files which have been polled are linked to RB tree | |
2908 | * fuse_conn->polled_files which is indexed by kh. Walk the tree and | |
2909 | * find the matching one. | |
2910 | */ | |
2911 | static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh, | |
2912 | struct rb_node **parent_out) | |
2913 | { | |
2914 | struct rb_node **link = &fc->polled_files.rb_node; | |
2915 | struct rb_node *last = NULL; | |
2916 | ||
2917 | while (*link) { | |
2918 | struct fuse_file *ff; | |
2919 | ||
2920 | last = *link; | |
2921 | ff = rb_entry(last, struct fuse_file, polled_node); | |
2922 | ||
2923 | if (kh < ff->kh) | |
2924 | link = &last->rb_left; | |
2925 | else if (kh > ff->kh) | |
2926 | link = &last->rb_right; | |
2927 | else | |
2928 | return link; | |
2929 | } | |
2930 | ||
2931 | if (parent_out) | |
2932 | *parent_out = last; | |
2933 | return link; | |
2934 | } | |
2935 | ||
2936 | /* | |
2937 | * The file is about to be polled. Make sure it's on the polled_files | |
2938 | * RB tree. Note that files once added to the polled_files tree are | |
2939 | * not removed before the file is released. This is because a file | |
2940 | * polled once is likely to be polled again. | |
2941 | */ | |
2942 | static void fuse_register_polled_file(struct fuse_conn *fc, | |
2943 | struct fuse_file *ff) | |
2944 | { | |
2945 | spin_lock(&fc->lock); | |
2946 | if (RB_EMPTY_NODE(&ff->polled_node)) { | |
f3846266 | 2947 | struct rb_node **link, *uninitialized_var(parent); |
95668a69 TH |
2948 | |
2949 | link = fuse_find_polled_node(fc, ff->kh, &parent); | |
2950 | BUG_ON(*link); | |
2951 | rb_link_node(&ff->polled_node, parent, link); | |
2952 | rb_insert_color(&ff->polled_node, &fc->polled_files); | |
2953 | } | |
2954 | spin_unlock(&fc->lock); | |
2955 | } | |
2956 | ||
076ccb76 | 2957 | __poll_t fuse_file_poll(struct file *file, poll_table *wait) |
95668a69 | 2958 | { |
95668a69 | 2959 | struct fuse_file *ff = file->private_data; |
797759aa | 2960 | struct fuse_conn *fc = ff->fc; |
95668a69 TH |
2961 | struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; |
2962 | struct fuse_poll_out outarg; | |
7078187a | 2963 | FUSE_ARGS(args); |
95668a69 TH |
2964 | int err; |
2965 | ||
2966 | if (fc->no_poll) | |
2967 | return DEFAULT_POLLMASK; | |
2968 | ||
2969 | poll_wait(file, &ff->poll_wait, wait); | |
c71d227f | 2970 | inarg.events = mangle_poll(poll_requested_events(wait)); |
95668a69 TH |
2971 | |
2972 | /* | |
2973 | * Ask for notification iff there's someone waiting for it. | |
2974 | * The client may ignore the flag and always notify. | |
2975 | */ | |
2976 | if (waitqueue_active(&ff->poll_wait)) { | |
2977 | inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY; | |
2978 | fuse_register_polled_file(fc, ff); | |
2979 | } | |
2980 | ||
d5b48543 MS |
2981 | args.opcode = FUSE_POLL; |
2982 | args.nodeid = ff->nodeid; | |
2983 | args.in_numargs = 1; | |
2984 | args.in_args[0].size = sizeof(inarg); | |
2985 | args.in_args[0].value = &inarg; | |
2986 | args.out_numargs = 1; | |
2987 | args.out_args[0].size = sizeof(outarg); | |
2988 | args.out_args[0].value = &outarg; | |
7078187a | 2989 | err = fuse_simple_request(fc, &args); |
95668a69 TH |
2990 | |
2991 | if (!err) | |
c71d227f | 2992 | return demangle_poll(outarg.revents); |
95668a69 TH |
2993 | if (err == -ENOSYS) { |
2994 | fc->no_poll = 1; | |
2995 | return DEFAULT_POLLMASK; | |
2996 | } | |
a9a08845 | 2997 | return EPOLLERR; |
95668a69 | 2998 | } |
08cbf542 | 2999 | EXPORT_SYMBOL_GPL(fuse_file_poll); |
95668a69 TH |
3000 | |
3001 | /* | |
3002 | * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and | |
3003 | * wakes up the poll waiters. | |
3004 | */ | |
3005 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, | |
3006 | struct fuse_notify_poll_wakeup_out *outarg) | |
3007 | { | |
3008 | u64 kh = outarg->kh; | |
3009 | struct rb_node **link; | |
3010 | ||
3011 | spin_lock(&fc->lock); | |
3012 | ||
3013 | link = fuse_find_polled_node(fc, kh, NULL); | |
3014 | if (*link) { | |
3015 | struct fuse_file *ff; | |
3016 | ||
3017 | ff = rb_entry(*link, struct fuse_file, polled_node); | |
3018 | wake_up_interruptible_sync(&ff->poll_wait); | |
3019 | } | |
3020 | ||
3021 | spin_unlock(&fc->lock); | |
3022 | return 0; | |
3023 | } | |
3024 | ||
efb9fa9e MP |
3025 | static void fuse_do_truncate(struct file *file) |
3026 | { | |
3027 | struct inode *inode = file->f_mapping->host; | |
3028 | struct iattr attr; | |
3029 | ||
3030 | attr.ia_valid = ATTR_SIZE; | |
3031 | attr.ia_size = i_size_read(inode); | |
3032 | ||
3033 | attr.ia_file = file; | |
3034 | attr.ia_valid |= ATTR_FILE; | |
3035 | ||
62490330 | 3036 | fuse_do_setattr(file_dentry(file), &attr, file); |
efb9fa9e MP |
3037 | } |
3038 | ||
5da784cc | 3039 | static inline loff_t fuse_round_up(struct fuse_conn *fc, loff_t off) |
e5c5f05d | 3040 | { |
5da784cc | 3041 | return round_up(off, fc->max_pages << PAGE_SHIFT); |
e5c5f05d MP |
3042 | } |
3043 | ||
4273b793 | 3044 | static ssize_t |
c8b8e32d | 3045 | fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
4273b793 | 3046 | { |
9d5722b7 | 3047 | DECLARE_COMPLETION_ONSTACK(wait); |
4273b793 | 3048 | ssize_t ret = 0; |
60b9df7a MS |
3049 | struct file *file = iocb->ki_filp; |
3050 | struct fuse_file *ff = file->private_data; | |
e5c5f05d | 3051 | bool async_dio = ff->fc->async_dio; |
4273b793 | 3052 | loff_t pos = 0; |
bcba24cc MP |
3053 | struct inode *inode; |
3054 | loff_t i_size; | |
a6cbcd4a | 3055 | size_t count = iov_iter_count(iter); |
c8b8e32d | 3056 | loff_t offset = iocb->ki_pos; |
36cf66ed | 3057 | struct fuse_io_priv *io; |
4273b793 | 3058 | |
4273b793 | 3059 | pos = offset; |
bcba24cc MP |
3060 | inode = file->f_mapping->host; |
3061 | i_size = i_size_read(inode); | |
4273b793 | 3062 | |
6f673763 | 3063 | if ((iov_iter_rw(iter) == READ) && (offset > i_size)) |
9fe55eea SW |
3064 | return 0; |
3065 | ||
439ee5f0 | 3066 | /* optimization for short read */ |
6f673763 | 3067 | if (async_dio && iov_iter_rw(iter) != WRITE && offset + count > i_size) { |
439ee5f0 MP |
3068 | if (offset >= i_size) |
3069 | return 0; | |
5da784cc | 3070 | iov_iter_truncate(iter, fuse_round_up(ff->fc, i_size - offset)); |
6b775b18 | 3071 | count = iov_iter_count(iter); |
439ee5f0 MP |
3072 | } |
3073 | ||
bcba24cc | 3074 | io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL); |
36cf66ed MP |
3075 | if (!io) |
3076 | return -ENOMEM; | |
bcba24cc | 3077 | spin_lock_init(&io->lock); |
744742d6 | 3078 | kref_init(&io->refcnt); |
bcba24cc MP |
3079 | io->reqs = 1; |
3080 | io->bytes = -1; | |
3081 | io->size = 0; | |
3082 | io->offset = offset; | |
6f673763 | 3083 | io->write = (iov_iter_rw(iter) == WRITE); |
bcba24cc | 3084 | io->err = 0; |
bcba24cc MP |
3085 | /* |
3086 | * By default, we want to optimize all I/Os with async request | |
60b9df7a | 3087 | * submission to the client filesystem if supported. |
bcba24cc | 3088 | */ |
e5c5f05d | 3089 | io->async = async_dio; |
bcba24cc | 3090 | io->iocb = iocb; |
7879c4e5 | 3091 | io->blocking = is_sync_kiocb(iocb); |
bcba24cc MP |
3092 | |
3093 | /* | |
7879c4e5 AS |
3094 | * We cannot asynchronously extend the size of a file. |
3095 | * In such case the aio will behave exactly like sync io. | |
bcba24cc | 3096 | */ |
7879c4e5 AS |
3097 | if ((offset + count > i_size) && iov_iter_rw(iter) == WRITE) |
3098 | io->blocking = true; | |
4273b793 | 3099 | |
7879c4e5 | 3100 | if (io->async && io->blocking) { |
744742d6 SF |
3101 | /* |
3102 | * Additional reference to keep io around after | |
3103 | * calling fuse_aio_complete() | |
3104 | */ | |
3105 | kref_get(&io->refcnt); | |
9d5722b7 | 3106 | io->done = &wait; |
744742d6 | 3107 | } |
9d5722b7 | 3108 | |
6f673763 | 3109 | if (iov_iter_rw(iter) == WRITE) { |
6b775b18 | 3110 | ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE); |
812408fb AV |
3111 | fuse_invalidate_attr(inode); |
3112 | } else { | |
d22a943f | 3113 | ret = __fuse_direct_read(io, iter, &pos); |
812408fb | 3114 | } |
36cf66ed | 3115 | |
bcba24cc | 3116 | if (io->async) { |
ebacb812 LC |
3117 | bool blocking = io->blocking; |
3118 | ||
bcba24cc MP |
3119 | fuse_aio_complete(io, ret < 0 ? ret : 0, -1); |
3120 | ||
3121 | /* we have a non-extending, async request, so return */ | |
ebacb812 | 3122 | if (!blocking) |
bcba24cc MP |
3123 | return -EIOCBQUEUED; |
3124 | ||
9d5722b7 CH |
3125 | wait_for_completion(&wait); |
3126 | ret = fuse_get_res_by_io(io); | |
bcba24cc MP |
3127 | } |
3128 | ||
744742d6 | 3129 | kref_put(&io->refcnt, fuse_io_release); |
9d5722b7 | 3130 | |
6f673763 | 3131 | if (iov_iter_rw(iter) == WRITE) { |
efb9fa9e MP |
3132 | if (ret > 0) |
3133 | fuse_write_update_size(inode, pos); | |
3134 | else if (ret < 0 && offset + count > i_size) | |
3135 | fuse_do_truncate(file); | |
3136 | } | |
4273b793 AA |
3137 | |
3138 | return ret; | |
3139 | } | |
3140 | ||
26eb3bae MS |
3141 | static int fuse_writeback_range(struct inode *inode, loff_t start, loff_t end) |
3142 | { | |
3143 | int err = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
3144 | ||
3145 | if (!err) | |
3146 | fuse_sync_writes(inode); | |
3147 | ||
3148 | return err; | |
3149 | } | |
3150 | ||
cdadb11c MS |
3151 | static long fuse_file_fallocate(struct file *file, int mode, loff_t offset, |
3152 | loff_t length) | |
05ba1f08 AP |
3153 | { |
3154 | struct fuse_file *ff = file->private_data; | |
1c68271c | 3155 | struct inode *inode = file_inode(file); |
0ab08f57 | 3156 | struct fuse_inode *fi = get_fuse_inode(inode); |
05ba1f08 | 3157 | struct fuse_conn *fc = ff->fc; |
7078187a | 3158 | FUSE_ARGS(args); |
05ba1f08 AP |
3159 | struct fuse_fallocate_in inarg = { |
3160 | .fh = ff->fh, | |
3161 | .offset = offset, | |
3162 | .length = length, | |
3163 | .mode = mode | |
3164 | }; | |
3165 | int err; | |
14c14414 MP |
3166 | bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) || |
3167 | (mode & FALLOC_FL_PUNCH_HOLE); | |
05ba1f08 | 3168 | |
4adb8302 MS |
3169 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
3170 | return -EOPNOTSUPP; | |
3171 | ||
519c6040 MS |
3172 | if (fc->no_fallocate) |
3173 | return -EOPNOTSUPP; | |
3174 | ||
14c14414 | 3175 | if (lock_inode) { |
5955102c | 3176 | inode_lock(inode); |
bde52788 MP |
3177 | if (mode & FALLOC_FL_PUNCH_HOLE) { |
3178 | loff_t endbyte = offset + length - 1; | |
26eb3bae MS |
3179 | |
3180 | err = fuse_writeback_range(inode, offset, endbyte); | |
bde52788 MP |
3181 | if (err) |
3182 | goto out; | |
bde52788 | 3183 | } |
3634a632 BF |
3184 | } |
3185 | ||
0cbade02 LB |
3186 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
3187 | offset + length > i_size_read(inode)) { | |
3188 | err = inode_newsize_ok(inode, offset + length); | |
3189 | if (err) | |
35d6fcbb | 3190 | goto out; |
0cbade02 LB |
3191 | } |
3192 | ||
0ab08f57 MP |
3193 | if (!(mode & FALLOC_FL_KEEP_SIZE)) |
3194 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
3195 | ||
d5b48543 MS |
3196 | args.opcode = FUSE_FALLOCATE; |
3197 | args.nodeid = ff->nodeid; | |
3198 | args.in_numargs = 1; | |
3199 | args.in_args[0].size = sizeof(inarg); | |
3200 | args.in_args[0].value = &inarg; | |
7078187a | 3201 | err = fuse_simple_request(fc, &args); |
519c6040 MS |
3202 | if (err == -ENOSYS) { |
3203 | fc->no_fallocate = 1; | |
3204 | err = -EOPNOTSUPP; | |
3205 | } | |
bee6c307 BF |
3206 | if (err) |
3207 | goto out; | |
3208 | ||
3209 | /* we could have extended the file */ | |
b0aa7606 MP |
3210 | if (!(mode & FALLOC_FL_KEEP_SIZE)) { |
3211 | bool changed = fuse_write_update_size(inode, offset + length); | |
3212 | ||
93d2269d MS |
3213 | if (changed && fc->writeback_cache) |
3214 | file_update_time(file); | |
b0aa7606 | 3215 | } |
bee6c307 BF |
3216 | |
3217 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
3218 | truncate_pagecache_range(inode, offset, offset + length - 1); | |
3219 | ||
3220 | fuse_invalidate_attr(inode); | |
3221 | ||
3634a632 | 3222 | out: |
0ab08f57 MP |
3223 | if (!(mode & FALLOC_FL_KEEP_SIZE)) |
3224 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
3225 | ||
bde52788 | 3226 | if (lock_inode) |
5955102c | 3227 | inode_unlock(inode); |
3634a632 | 3228 | |
05ba1f08 AP |
3229 | return err; |
3230 | } | |
05ba1f08 | 3231 | |
64bf5ff5 DC |
3232 | static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in, |
3233 | struct file *file_out, loff_t pos_out, | |
3234 | size_t len, unsigned int flags) | |
88bc7d50 NV |
3235 | { |
3236 | struct fuse_file *ff_in = file_in->private_data; | |
3237 | struct fuse_file *ff_out = file_out->private_data; | |
a2bc9236 | 3238 | struct inode *inode_in = file_inode(file_in); |
88bc7d50 NV |
3239 | struct inode *inode_out = file_inode(file_out); |
3240 | struct fuse_inode *fi_out = get_fuse_inode(inode_out); | |
3241 | struct fuse_conn *fc = ff_in->fc; | |
3242 | FUSE_ARGS(args); | |
3243 | struct fuse_copy_file_range_in inarg = { | |
3244 | .fh_in = ff_in->fh, | |
3245 | .off_in = pos_in, | |
3246 | .nodeid_out = ff_out->nodeid, | |
3247 | .fh_out = ff_out->fh, | |
3248 | .off_out = pos_out, | |
3249 | .len = len, | |
3250 | .flags = flags | |
3251 | }; | |
3252 | struct fuse_write_out outarg; | |
3253 | ssize_t err; | |
3254 | /* mark unstable when write-back is not used, and file_out gets | |
3255 | * extended */ | |
3256 | bool is_unstable = (!fc->writeback_cache) && | |
3257 | ((pos_out + len) > inode_out->i_size); | |
3258 | ||
3259 | if (fc->no_copy_file_range) | |
3260 | return -EOPNOTSUPP; | |
3261 | ||
5dae222a AG |
3262 | if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb) |
3263 | return -EXDEV; | |
3264 | ||
a2bc9236 MS |
3265 | if (fc->writeback_cache) { |
3266 | inode_lock(inode_in); | |
26eb3bae | 3267 | err = fuse_writeback_range(inode_in, pos_in, pos_in + len); |
a2bc9236 MS |
3268 | inode_unlock(inode_in); |
3269 | if (err) | |
3270 | return err; | |
3271 | } | |
3272 | ||
88bc7d50 NV |
3273 | inode_lock(inode_out); |
3274 | ||
fe0da9c0 AG |
3275 | err = file_modified(file_out); |
3276 | if (err) | |
3277 | goto out; | |
3278 | ||
88bc7d50 | 3279 | if (fc->writeback_cache) { |
26eb3bae | 3280 | err = fuse_writeback_range(inode_out, pos_out, pos_out + len); |
88bc7d50 NV |
3281 | if (err) |
3282 | goto out; | |
88bc7d50 NV |
3283 | } |
3284 | ||
3285 | if (is_unstable) | |
3286 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi_out->state); | |
3287 | ||
d5b48543 MS |
3288 | args.opcode = FUSE_COPY_FILE_RANGE; |
3289 | args.nodeid = ff_in->nodeid; | |
3290 | args.in_numargs = 1; | |
3291 | args.in_args[0].size = sizeof(inarg); | |
3292 | args.in_args[0].value = &inarg; | |
3293 | args.out_numargs = 1; | |
3294 | args.out_args[0].size = sizeof(outarg); | |
3295 | args.out_args[0].value = &outarg; | |
88bc7d50 NV |
3296 | err = fuse_simple_request(fc, &args); |
3297 | if (err == -ENOSYS) { | |
3298 | fc->no_copy_file_range = 1; | |
3299 | err = -EOPNOTSUPP; | |
3300 | } | |
3301 | if (err) | |
3302 | goto out; | |
3303 | ||
3304 | if (fc->writeback_cache) { | |
3305 | fuse_write_update_size(inode_out, pos_out + outarg.size); | |
3306 | file_update_time(file_out); | |
3307 | } | |
3308 | ||
3309 | fuse_invalidate_attr(inode_out); | |
3310 | ||
3311 | err = outarg.size; | |
3312 | out: | |
3313 | if (is_unstable) | |
3314 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi_out->state); | |
3315 | ||
3316 | inode_unlock(inode_out); | |
fe0da9c0 | 3317 | file_accessed(file_in); |
88bc7d50 NV |
3318 | |
3319 | return err; | |
3320 | } | |
3321 | ||
64bf5ff5 DC |
3322 | static ssize_t fuse_copy_file_range(struct file *src_file, loff_t src_off, |
3323 | struct file *dst_file, loff_t dst_off, | |
3324 | size_t len, unsigned int flags) | |
3325 | { | |
3326 | ssize_t ret; | |
3327 | ||
3328 | ret = __fuse_copy_file_range(src_file, src_off, dst_file, dst_off, | |
3329 | len, flags); | |
3330 | ||
5dae222a | 3331 | if (ret == -EOPNOTSUPP || ret == -EXDEV) |
64bf5ff5 DC |
3332 | ret = generic_copy_file_range(src_file, src_off, dst_file, |
3333 | dst_off, len, flags); | |
3334 | return ret; | |
3335 | } | |
3336 | ||
4b6f5d20 | 3337 | static const struct file_operations fuse_file_operations = { |
5559b8f4 | 3338 | .llseek = fuse_file_llseek, |
37c20f16 | 3339 | .read_iter = fuse_file_read_iter, |
84c3d55c | 3340 | .write_iter = fuse_file_write_iter, |
b6aeaded MS |
3341 | .mmap = fuse_file_mmap, |
3342 | .open = fuse_open, | |
3343 | .flush = fuse_flush, | |
3344 | .release = fuse_release, | |
3345 | .fsync = fuse_fsync, | |
71421259 | 3346 | .lock = fuse_file_lock, |
a9ff4f87 | 3347 | .flock = fuse_file_flock, |
3c3db095 MS |
3348 | .splice_read = generic_file_splice_read, |
3349 | .splice_write = iter_file_splice_write, | |
59efec7b TH |
3350 | .unlocked_ioctl = fuse_file_ioctl, |
3351 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 3352 | .poll = fuse_file_poll, |
05ba1f08 | 3353 | .fallocate = fuse_file_fallocate, |
d4136d60 | 3354 | .copy_file_range = fuse_copy_file_range, |
413ef8cb MS |
3355 | }; |
3356 | ||
f5e54d6e | 3357 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 3358 | .readpage = fuse_readpage, |
3be5a52b | 3359 | .writepage = fuse_writepage, |
26d614df | 3360 | .writepages = fuse_writepages, |
3be5a52b | 3361 | .launder_page = fuse_launder_page, |
db50b96c | 3362 | .readpages = fuse_readpages, |
3be5a52b | 3363 | .set_page_dirty = __set_page_dirty_nobuffers, |
b2d2272f | 3364 | .bmap = fuse_bmap, |
4273b793 | 3365 | .direct_IO = fuse_direct_IO, |
6b12c1b3 PE |
3366 | .write_begin = fuse_write_begin, |
3367 | .write_end = fuse_write_end, | |
b6aeaded MS |
3368 | }; |
3369 | ||
3370 | void fuse_init_file_inode(struct inode *inode) | |
3371 | { | |
ab2257e9 MS |
3372 | struct fuse_inode *fi = get_fuse_inode(inode); |
3373 | ||
45323fb7 MS |
3374 | inode->i_fop = &fuse_file_operations; |
3375 | inode->i_data.a_ops = &fuse_file_aops; | |
ab2257e9 MS |
3376 | |
3377 | INIT_LIST_HEAD(&fi->write_files); | |
3378 | INIT_LIST_HEAD(&fi->queued_writes); | |
3379 | fi->writectr = 0; | |
3380 | init_waitqueue_head(&fi->page_waitq); | |
3381 | INIT_LIST_HEAD(&fi->writepages); | |
b6aeaded | 3382 | } |