]>
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 | |
91fe96b4 MS |
22 | static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
23 | int opcode, struct fuse_open_out *outargp) | |
b6aeaded | 24 | { |
b6aeaded | 25 | struct fuse_open_in inarg; |
7078187a | 26 | FUSE_ARGS(args); |
fd72faac MS |
27 | |
28 | memset(&inarg, 0, sizeof(inarg)); | |
6ff958ed MS |
29 | inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY); |
30 | if (!fc->atomic_o_trunc) | |
31 | inarg.flags &= ~O_TRUNC; | |
7078187a MS |
32 | args.in.h.opcode = opcode; |
33 | args.in.h.nodeid = nodeid; | |
34 | args.in.numargs = 1; | |
35 | args.in.args[0].size = sizeof(inarg); | |
36 | args.in.args[0].value = &inarg; | |
37 | args.out.numargs = 1; | |
38 | args.out.args[0].size = sizeof(*outargp); | |
39 | args.out.args[0].value = outargp; | |
fd72faac | 40 | |
7078187a | 41 | return fuse_simple_request(fc, &args); |
fd72faac MS |
42 | } |
43 | ||
acf99433 | 44 | struct fuse_file *fuse_file_alloc(struct fuse_conn *fc) |
fd72faac MS |
45 | { |
46 | struct fuse_file *ff; | |
6b2db28a | 47 | |
68227c03 | 48 | ff = kzalloc(sizeof(struct fuse_file), GFP_KERNEL); |
6b2db28a TH |
49 | if (unlikely(!ff)) |
50 | return NULL; | |
51 | ||
da5e4714 | 52 | ff->fc = fc; |
4250c066 | 53 | ff->reserved_req = fuse_request_alloc(0); |
6b2db28a TH |
54 | if (unlikely(!ff->reserved_req)) { |
55 | kfree(ff); | |
56 | return NULL; | |
fd72faac | 57 | } |
6b2db28a TH |
58 | |
59 | INIT_LIST_HEAD(&ff->write_entry); | |
5d7bc7e8 | 60 | mutex_init(&ff->readdir.lock); |
4e8c2eb5 | 61 | refcount_set(&ff->count, 1); |
6b2db28a TH |
62 | RB_CLEAR_NODE(&ff->polled_node); |
63 | init_waitqueue_head(&ff->poll_wait); | |
64 | ||
75126f55 | 65 | ff->kh = atomic64_inc_return(&fc->khctr); |
6b2db28a | 66 | |
fd72faac MS |
67 | return ff; |
68 | } | |
69 | ||
70 | void fuse_file_free(struct fuse_file *ff) | |
71 | { | |
33649c91 | 72 | fuse_request_free(ff->reserved_req); |
5d7bc7e8 | 73 | mutex_destroy(&ff->readdir.lock); |
fd72faac MS |
74 | kfree(ff); |
75 | } | |
76 | ||
267d8444 | 77 | static struct fuse_file *fuse_file_get(struct fuse_file *ff) |
c756e0a4 | 78 | { |
4e8c2eb5 | 79 | refcount_inc(&ff->count); |
c756e0a4 MS |
80 | return ff; |
81 | } | |
82 | ||
819c4b3b MS |
83 | static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) |
84 | { | |
baebccbe | 85 | iput(req->misc.release.inode); |
819c4b3b MS |
86 | } |
87 | ||
2e64ff15 | 88 | static void fuse_file_put(struct fuse_file *ff, bool sync, bool isdir) |
c756e0a4 | 89 | { |
4e8c2eb5 | 90 | if (refcount_dec_and_test(&ff->count)) { |
c756e0a4 | 91 | struct fuse_req *req = ff->reserved_req; |
8b0797a4 | 92 | |
d9a9ea94 | 93 | if (isdir ? ff->fc->no_opendir : ff->fc->no_open) { |
7678ac50 AG |
94 | /* |
95 | * Drop the release request when client does not | |
96 | * implement 'open' | |
97 | */ | |
825d6d33 | 98 | __clear_bit(FR_BACKGROUND, &req->flags); |
baebccbe | 99 | iput(req->misc.release.inode); |
7678ac50 AG |
100 | fuse_put_request(ff->fc, req); |
101 | } else if (sync) { | |
2e38bea9 | 102 | __set_bit(FR_FORCE, &req->flags); |
825d6d33 | 103 | __clear_bit(FR_BACKGROUND, &req->flags); |
5a18ec17 | 104 | fuse_request_send(ff->fc, req); |
baebccbe | 105 | iput(req->misc.release.inode); |
5a18ec17 MS |
106 | fuse_put_request(ff->fc, req); |
107 | } else { | |
108 | req->end = fuse_release_end; | |
825d6d33 | 109 | __set_bit(FR_BACKGROUND, &req->flags); |
5a18ec17 MS |
110 | fuse_request_send_background(ff->fc, req); |
111 | } | |
c756e0a4 MS |
112 | kfree(ff); |
113 | } | |
114 | } | |
115 | ||
08cbf542 TH |
116 | int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
117 | bool isdir) | |
91fe96b4 | 118 | { |
91fe96b4 | 119 | struct fuse_file *ff; |
91fe96b4 MS |
120 | int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; |
121 | ||
122 | ff = fuse_file_alloc(fc); | |
123 | if (!ff) | |
124 | return -ENOMEM; | |
125 | ||
7678ac50 | 126 | ff->fh = 0; |
fabf7e02 CA |
127 | /* Default for no-open */ |
128 | ff->open_flags = FOPEN_KEEP_CACHE | (isdir ? FOPEN_CACHE_DIR : 0); | |
d9a9ea94 | 129 | if (isdir ? !fc->no_opendir : !fc->no_open) { |
7678ac50 AG |
130 | struct fuse_open_out outarg; |
131 | int err; | |
132 | ||
133 | err = fuse_send_open(fc, nodeid, file, opcode, &outarg); | |
134 | if (!err) { | |
135 | ff->fh = outarg.fh; | |
136 | ff->open_flags = outarg.open_flags; | |
137 | ||
d9a9ea94 | 138 | } else if (err != -ENOSYS) { |
7678ac50 AG |
139 | fuse_file_free(ff); |
140 | return err; | |
141 | } else { | |
d9a9ea94 CA |
142 | if (isdir) |
143 | fc->no_opendir = 1; | |
144 | else | |
145 | fc->no_open = 1; | |
7678ac50 | 146 | } |
91fe96b4 MS |
147 | } |
148 | ||
149 | if (isdir) | |
7678ac50 | 150 | ff->open_flags &= ~FOPEN_DIRECT_IO; |
91fe96b4 | 151 | |
91fe96b4 | 152 | ff->nodeid = nodeid; |
267d8444 | 153 | file->private_data = ff; |
91fe96b4 MS |
154 | |
155 | return 0; | |
156 | } | |
08cbf542 | 157 | EXPORT_SYMBOL_GPL(fuse_do_open); |
91fe96b4 | 158 | |
650b22b9 PE |
159 | static void fuse_link_write_file(struct file *file) |
160 | { | |
161 | struct inode *inode = file_inode(file); | |
650b22b9 PE |
162 | struct fuse_inode *fi = get_fuse_inode(inode); |
163 | struct fuse_file *ff = file->private_data; | |
164 | /* | |
165 | * file may be written through mmap, so chain it onto the | |
166 | * inodes's write_file list | |
167 | */ | |
f15ecfef | 168 | spin_lock(&fi->lock); |
650b22b9 PE |
169 | if (list_empty(&ff->write_entry)) |
170 | list_add(&ff->write_entry, &fi->write_files); | |
f15ecfef | 171 | spin_unlock(&fi->lock); |
650b22b9 PE |
172 | } |
173 | ||
c7b7143c | 174 | void fuse_finish_open(struct inode *inode, struct file *file) |
fd72faac | 175 | { |
c7b7143c | 176 | struct fuse_file *ff = file->private_data; |
a0822c55 | 177 | struct fuse_conn *fc = get_fuse_conn(inode); |
c7b7143c | 178 | |
c7b7143c | 179 | if (!(ff->open_flags & FOPEN_KEEP_CACHE)) |
b1009979 | 180 | invalidate_inode_pages2(inode->i_mapping); |
bbd84f33 KS |
181 | if (ff->open_flags & FOPEN_STREAM) |
182 | stream_open(inode, file); | |
183 | else if (ff->open_flags & FOPEN_NONSEEKABLE) | |
a7c1b990 | 184 | nonseekable_open(inode, file); |
a0822c55 KS |
185 | if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) { |
186 | struct fuse_inode *fi = get_fuse_inode(inode); | |
187 | ||
f15ecfef | 188 | spin_lock(&fi->lock); |
4510d86f | 189 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
a0822c55 | 190 | i_size_write(inode, 0); |
f15ecfef | 191 | spin_unlock(&fi->lock); |
a0822c55 | 192 | fuse_invalidate_attr(inode); |
75caeecd MP |
193 | if (fc->writeback_cache) |
194 | file_update_time(file); | |
a0822c55 | 195 | } |
4d99ff8f PE |
196 | if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache) |
197 | fuse_link_write_file(file); | |
fd72faac MS |
198 | } |
199 | ||
91fe96b4 | 200 | int fuse_open_common(struct inode *inode, struct file *file, bool isdir) |
fd72faac | 201 | { |
acf99433 | 202 | struct fuse_conn *fc = get_fuse_conn(inode); |
b6aeaded | 203 | int err; |
75caeecd MP |
204 | bool lock_inode = (file->f_flags & O_TRUNC) && |
205 | fc->atomic_o_trunc && | |
206 | fc->writeback_cache; | |
b6aeaded MS |
207 | |
208 | err = generic_file_open(inode, file); | |
209 | if (err) | |
210 | return err; | |
211 | ||
75caeecd | 212 | if (lock_inode) |
5955102c | 213 | inode_lock(inode); |
75caeecd | 214 | |
91fe96b4 | 215 | err = fuse_do_open(fc, get_node_id(inode), file, isdir); |
b6aeaded | 216 | |
75caeecd MP |
217 | if (!err) |
218 | fuse_finish_open(inode, file); | |
91fe96b4 | 219 | |
75caeecd | 220 | if (lock_inode) |
5955102c | 221 | inode_unlock(inode); |
75caeecd MP |
222 | |
223 | return err; | |
b6aeaded MS |
224 | } |
225 | ||
ebf84d0c KT |
226 | static void fuse_prepare_release(struct fuse_inode *fi, struct fuse_file *ff, |
227 | int flags, int opcode) | |
64c6d8ed | 228 | { |
8b0797a4 | 229 | struct fuse_conn *fc = ff->fc; |
33649c91 | 230 | struct fuse_req *req = ff->reserved_req; |
b57d4264 | 231 | struct fuse_release_in *inarg = &req->misc.release.in; |
b6aeaded | 232 | |
f15ecfef KT |
233 | /* Inode is NULL on error path of fuse_create_open() */ |
234 | if (likely(fi)) { | |
235 | spin_lock(&fi->lock); | |
236 | list_del(&ff->write_entry); | |
237 | spin_unlock(&fi->lock); | |
238 | } | |
8b0797a4 | 239 | spin_lock(&fc->lock); |
8b0797a4 MS |
240 | if (!RB_EMPTY_NODE(&ff->polled_node)) |
241 | rb_erase(&ff->polled_node, &fc->polled_files); | |
242 | spin_unlock(&fc->lock); | |
243 | ||
357ccf2b | 244 | wake_up_interruptible_all(&ff->poll_wait); |
8b0797a4 | 245 | |
b6aeaded | 246 | inarg->fh = ff->fh; |
fd72faac | 247 | inarg->flags = flags; |
51eb01e7 | 248 | req->in.h.opcode = opcode; |
c7b7143c | 249 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
250 | req->in.numargs = 1; |
251 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
252 | req->in.args[0].value = inarg; | |
fd72faac MS |
253 | } |
254 | ||
2e64ff15 | 255 | void fuse_release_common(struct file *file, bool isdir) |
fd72faac | 256 | { |
ebf84d0c | 257 | struct fuse_inode *fi = get_fuse_inode(file_inode(file)); |
9a87ad3d MS |
258 | struct fuse_file *ff = file->private_data; |
259 | struct fuse_req *req = ff->reserved_req; | |
2e64ff15 | 260 | int opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE; |
6b2db28a | 261 | |
ebf84d0c | 262 | fuse_prepare_release(fi, ff, file->f_flags, opcode); |
6b2db28a | 263 | |
37fb3a30 MS |
264 | if (ff->flock) { |
265 | struct fuse_release_in *inarg = &req->misc.release.in; | |
266 | inarg->release_flags |= FUSE_RELEASE_FLOCK_UNLOCK; | |
267 | inarg->lock_owner = fuse_lock_owner_id(ff->fc, | |
268 | (fl_owner_t) file); | |
269 | } | |
baebccbe MS |
270 | /* Hold inode until release is finished */ |
271 | req->misc.release.inode = igrab(file_inode(file)); | |
6b2db28a | 272 | |
6b2db28a TH |
273 | /* |
274 | * Normally this will send the RELEASE request, however if | |
275 | * some asynchronous READ or WRITE requests are outstanding, | |
276 | * the sending will be delayed. | |
5a18ec17 MS |
277 | * |
278 | * Make the release synchronous if this is a fuseblk mount, | |
279 | * synchronous RELEASE is allowed (and desirable) in this case | |
280 | * because the server can be trusted not to screw up. | |
6b2db28a | 281 | */ |
2e64ff15 | 282 | fuse_file_put(ff, ff->fc->destroy_req != NULL, isdir); |
b6aeaded MS |
283 | } |
284 | ||
04730fef MS |
285 | static int fuse_open(struct inode *inode, struct file *file) |
286 | { | |
91fe96b4 | 287 | return fuse_open_common(inode, file, false); |
04730fef MS |
288 | } |
289 | ||
290 | static int fuse_release(struct inode *inode, struct file *file) | |
291 | { | |
e7cc133c PE |
292 | struct fuse_conn *fc = get_fuse_conn(inode); |
293 | ||
294 | /* see fuse_vma_close() for !writeback_cache case */ | |
295 | if (fc->writeback_cache) | |
1e18bda8 | 296 | write_inode_now(inode, 1); |
b0aa7606 | 297 | |
2e64ff15 | 298 | fuse_release_common(file, false); |
8b0797a4 MS |
299 | |
300 | /* return value is ignored by VFS */ | |
301 | return 0; | |
302 | } | |
303 | ||
ebf84d0c | 304 | void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff, int flags) |
8b0797a4 | 305 | { |
4e8c2eb5 | 306 | WARN_ON(refcount_read(&ff->count) > 1); |
ebf84d0c | 307 | fuse_prepare_release(fi, ff, flags, FUSE_RELEASE); |
267d8444 MS |
308 | /* |
309 | * iput(NULL) is a no-op and since the refcount is 1 and everything's | |
310 | * synchronous, we are fine with not doing igrab() here" | |
311 | */ | |
2e64ff15 | 312 | fuse_file_put(ff, true, false); |
04730fef | 313 | } |
08cbf542 | 314 | EXPORT_SYMBOL_GPL(fuse_sync_release); |
04730fef | 315 | |
71421259 | 316 | /* |
9c8ef561 MS |
317 | * Scramble the ID space with XTEA, so that the value of the files_struct |
318 | * pointer is not exposed to userspace. | |
71421259 | 319 | */ |
f3332114 | 320 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 321 | { |
9c8ef561 MS |
322 | u32 *k = fc->scramble_key; |
323 | u64 v = (unsigned long) id; | |
324 | u32 v0 = v; | |
325 | u32 v1 = v >> 32; | |
326 | u32 sum = 0; | |
327 | int i; | |
328 | ||
329 | for (i = 0; i < 32; i++) { | |
330 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
331 | sum += 0x9E3779B9; | |
332 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
333 | } | |
334 | ||
335 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
336 | } |
337 | ||
2fe93bd4 MS |
338 | static struct fuse_req *fuse_find_writeback(struct fuse_inode *fi, |
339 | pgoff_t idx_from, pgoff_t idx_to) | |
340 | { | |
341 | struct fuse_req *req; | |
342 | ||
343 | list_for_each_entry(req, &fi->writepages, writepages_entry) { | |
344 | pgoff_t curr_index; | |
345 | ||
346 | WARN_ON(get_fuse_inode(req->inode) != fi); | |
347 | curr_index = req->misc.write.in.offset >> PAGE_SHIFT; | |
348 | if (idx_from < curr_index + req->num_pages && | |
349 | curr_index <= idx_to) { | |
350 | return req; | |
351 | } | |
352 | } | |
353 | return NULL; | |
354 | } | |
355 | ||
3be5a52b | 356 | /* |
ea8cd333 | 357 | * Check if any page in a range is under writeback |
3be5a52b MS |
358 | * |
359 | * This is currently done by walking the list of writepage requests | |
360 | * for the inode, which can be pretty inefficient. | |
361 | */ | |
ea8cd333 PE |
362 | static bool fuse_range_is_writeback(struct inode *inode, pgoff_t idx_from, |
363 | pgoff_t idx_to) | |
3be5a52b | 364 | { |
3be5a52b | 365 | struct fuse_inode *fi = get_fuse_inode(inode); |
2fe93bd4 | 366 | bool found; |
3be5a52b | 367 | |
f15ecfef | 368 | spin_lock(&fi->lock); |
2fe93bd4 | 369 | found = fuse_find_writeback(fi, idx_from, idx_to); |
f15ecfef | 370 | spin_unlock(&fi->lock); |
3be5a52b MS |
371 | |
372 | return found; | |
373 | } | |
374 | ||
ea8cd333 PE |
375 | static inline bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) |
376 | { | |
377 | return fuse_range_is_writeback(inode, index, index); | |
378 | } | |
379 | ||
3be5a52b MS |
380 | /* |
381 | * Wait for page writeback to be completed. | |
382 | * | |
383 | * Since fuse doesn't rely on the VM writeback tracking, this has to | |
384 | * use some other means. | |
385 | */ | |
386 | static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) | |
387 | { | |
388 | struct fuse_inode *fi = get_fuse_inode(inode); | |
389 | ||
390 | wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); | |
391 | return 0; | |
392 | } | |
393 | ||
fe38d7df MP |
394 | /* |
395 | * Wait for all pending writepages on the inode to finish. | |
396 | * | |
397 | * This is currently done by blocking further writes with FUSE_NOWRITE | |
398 | * and waiting for all sent writes to complete. | |
399 | * | |
400 | * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage | |
401 | * could conflict with truncation. | |
402 | */ | |
403 | static void fuse_sync_writes(struct inode *inode) | |
404 | { | |
405 | fuse_set_nowrite(inode); | |
406 | fuse_release_nowrite(inode); | |
407 | } | |
408 | ||
75e1fcc0 | 409 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 410 | { |
6131ffaa | 411 | struct inode *inode = file_inode(file); |
b6aeaded MS |
412 | struct fuse_conn *fc = get_fuse_conn(inode); |
413 | struct fuse_file *ff = file->private_data; | |
414 | struct fuse_req *req; | |
415 | struct fuse_flush_in inarg; | |
416 | int err; | |
417 | ||
248d86e8 MS |
418 | if (is_bad_inode(inode)) |
419 | return -EIO; | |
420 | ||
b6aeaded MS |
421 | if (fc->no_flush) |
422 | return 0; | |
423 | ||
1e18bda8 | 424 | err = write_inode_now(inode, 1); |
fe38d7df MP |
425 | if (err) |
426 | return err; | |
427 | ||
5955102c | 428 | inode_lock(inode); |
fe38d7df | 429 | fuse_sync_writes(inode); |
5955102c | 430 | inode_unlock(inode); |
fe38d7df | 431 | |
4a7f4e88 | 432 | err = filemap_check_errors(file->f_mapping); |
9ebce595 MP |
433 | if (err) |
434 | return err; | |
435 | ||
b111c8c0 | 436 | req = fuse_get_req_nofail_nopages(fc, file); |
b6aeaded MS |
437 | memset(&inarg, 0, sizeof(inarg)); |
438 | inarg.fh = ff->fh; | |
9c8ef561 | 439 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
440 | req->in.h.opcode = FUSE_FLUSH; |
441 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
442 | req->in.numargs = 1; |
443 | req->in.args[0].size = sizeof(inarg); | |
444 | req->in.args[0].value = &inarg; | |
825d6d33 | 445 | __set_bit(FR_FORCE, &req->flags); |
b93f858a | 446 | fuse_request_send(fc, req); |
b6aeaded MS |
447 | err = req->out.h.error; |
448 | fuse_put_request(fc, req); | |
449 | if (err == -ENOSYS) { | |
450 | fc->no_flush = 1; | |
451 | err = 0; | |
452 | } | |
453 | return err; | |
454 | } | |
455 | ||
02c24a82 | 456 | int fuse_fsync_common(struct file *file, loff_t start, loff_t end, |
a9c2d1e8 | 457 | int datasync, int opcode) |
b6aeaded | 458 | { |
7ea80859 | 459 | struct inode *inode = file->f_mapping->host; |
b6aeaded MS |
460 | struct fuse_conn *fc = get_fuse_conn(inode); |
461 | struct fuse_file *ff = file->private_data; | |
7078187a | 462 | FUSE_ARGS(args); |
b6aeaded | 463 | struct fuse_fsync_in inarg; |
a9c2d1e8 MS |
464 | |
465 | memset(&inarg, 0, sizeof(inarg)); | |
466 | inarg.fh = ff->fh; | |
154603fe | 467 | inarg.fsync_flags = datasync ? FUSE_FSYNC_FDATASYNC : 0; |
a9c2d1e8 MS |
468 | args.in.h.opcode = opcode; |
469 | args.in.h.nodeid = get_node_id(inode); | |
470 | args.in.numargs = 1; | |
471 | args.in.args[0].size = sizeof(inarg); | |
472 | args.in.args[0].value = &inarg; | |
473 | return fuse_simple_request(fc, &args); | |
474 | } | |
475 | ||
476 | static int fuse_fsync(struct file *file, loff_t start, loff_t end, | |
477 | int datasync) | |
478 | { | |
479 | struct inode *inode = file->f_mapping->host; | |
480 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b6aeaded MS |
481 | int err; |
482 | ||
248d86e8 MS |
483 | if (is_bad_inode(inode)) |
484 | return -EIO; | |
485 | ||
5955102c | 486 | inode_lock(inode); |
02c24a82 | 487 | |
3be5a52b MS |
488 | /* |
489 | * Start writeback against all dirty pages of the inode, then | |
490 | * wait for all outstanding writes, before sending the FSYNC | |
491 | * request. | |
492 | */ | |
7e51fe1d | 493 | err = file_write_and_wait_range(file, start, end); |
3be5a52b | 494 | if (err) |
02c24a82 | 495 | goto out; |
3be5a52b MS |
496 | |
497 | fuse_sync_writes(inode); | |
ac7f052b AK |
498 | |
499 | /* | |
500 | * Due to implementation of fuse writeback | |
7e51fe1d | 501 | * file_write_and_wait_range() does not catch errors. |
ac7f052b AK |
502 | * We have to do this directly after fuse_sync_writes() |
503 | */ | |
7e51fe1d | 504 | err = file_check_and_advance_wb_err(file); |
ac7f052b AK |
505 | if (err) |
506 | goto out; | |
507 | ||
1e18bda8 MS |
508 | err = sync_inode_metadata(inode, 1); |
509 | if (err) | |
510 | goto out; | |
3be5a52b | 511 | |
a9c2d1e8 | 512 | if (fc->no_fsync) |
22401e7b | 513 | goto out; |
b0aa7606 | 514 | |
a9c2d1e8 | 515 | err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNC); |
b6aeaded | 516 | if (err == -ENOSYS) { |
a9c2d1e8 | 517 | fc->no_fsync = 1; |
b6aeaded MS |
518 | err = 0; |
519 | } | |
02c24a82 | 520 | out: |
5955102c | 521 | inode_unlock(inode); |
b6aeaded | 522 | |
a9c2d1e8 | 523 | return err; |
82547981 MS |
524 | } |
525 | ||
2106cb18 MS |
526 | void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos, |
527 | size_t count, int opcode) | |
b6aeaded | 528 | { |
5c5c5e51 | 529 | struct fuse_read_in *inarg = &req->misc.read.in; |
a6643094 | 530 | struct fuse_file *ff = file->private_data; |
b6aeaded | 531 | |
361b1eb5 MS |
532 | inarg->fh = ff->fh; |
533 | inarg->offset = pos; | |
534 | inarg->size = count; | |
a6643094 | 535 | inarg->flags = file->f_flags; |
361b1eb5 | 536 | req->in.h.opcode = opcode; |
2106cb18 | 537 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
538 | req->in.numargs = 1; |
539 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 540 | req->in.args[0].value = inarg; |
b6aeaded MS |
541 | req->out.argvar = 1; |
542 | req->out.numargs = 1; | |
543 | req->out.args[0].size = count; | |
b6aeaded MS |
544 | } |
545 | ||
8fba54ae | 546 | static void fuse_release_user_pages(struct fuse_req *req, bool should_dirty) |
187c5c36 MP |
547 | { |
548 | unsigned i; | |
549 | ||
550 | for (i = 0; i < req->num_pages; i++) { | |
551 | struct page *page = req->pages[i]; | |
8fba54ae | 552 | if (should_dirty) |
187c5c36 MP |
553 | set_page_dirty_lock(page); |
554 | put_page(page); | |
555 | } | |
556 | } | |
557 | ||
744742d6 SF |
558 | static void fuse_io_release(struct kref *kref) |
559 | { | |
560 | kfree(container_of(kref, struct fuse_io_priv, refcnt)); | |
561 | } | |
562 | ||
9d5722b7 CH |
563 | static ssize_t fuse_get_res_by_io(struct fuse_io_priv *io) |
564 | { | |
565 | if (io->err) | |
566 | return io->err; | |
567 | ||
568 | if (io->bytes >= 0 && io->write) | |
569 | return -EIO; | |
570 | ||
571 | return io->bytes < 0 ? io->size : io->bytes; | |
572 | } | |
573 | ||
01e9d11a MP |
574 | /** |
575 | * In case of short read, the caller sets 'pos' to the position of | |
576 | * actual end of fuse request in IO request. Otherwise, if bytes_requested | |
577 | * == bytes_transferred or rw == WRITE, the caller sets 'pos' to -1. | |
578 | * | |
579 | * An example: | |
580 | * User requested DIO read of 64K. It was splitted into two 32K fuse requests, | |
581 | * both submitted asynchronously. The first of them was ACKed by userspace as | |
582 | * fully completed (req->out.args[0].size == 32K) resulting in pos == -1. The | |
583 | * second request was ACKed as short, e.g. only 1K was read, resulting in | |
584 | * pos == 33K. | |
585 | * | |
586 | * Thus, when all fuse requests are completed, the minimal non-negative 'pos' | |
587 | * will be equal to the length of the longest contiguous fragment of | |
588 | * transferred data starting from the beginning of IO request. | |
589 | */ | |
590 | static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos) | |
591 | { | |
592 | int left; | |
593 | ||
594 | spin_lock(&io->lock); | |
595 | if (err) | |
596 | io->err = io->err ? : err; | |
597 | else if (pos >= 0 && (io->bytes < 0 || pos < io->bytes)) | |
598 | io->bytes = pos; | |
599 | ||
600 | left = --io->reqs; | |
7879c4e5 | 601 | if (!left && io->blocking) |
9d5722b7 | 602 | complete(io->done); |
01e9d11a MP |
603 | spin_unlock(&io->lock); |
604 | ||
7879c4e5 | 605 | if (!left && !io->blocking) { |
9d5722b7 | 606 | ssize_t res = fuse_get_res_by_io(io); |
01e9d11a | 607 | |
9d5722b7 CH |
608 | if (res >= 0) { |
609 | struct inode *inode = file_inode(io->iocb->ki_filp); | |
610 | struct fuse_conn *fc = get_fuse_conn(inode); | |
611 | struct fuse_inode *fi = get_fuse_inode(inode); | |
01e9d11a | 612 | |
f15ecfef | 613 | spin_lock(&fi->lock); |
4510d86f | 614 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
f15ecfef | 615 | spin_unlock(&fi->lock); |
01e9d11a MP |
616 | } |
617 | ||
04b2fa9f | 618 | io->iocb->ki_complete(io->iocb, res, 0); |
01e9d11a | 619 | } |
744742d6 SF |
620 | |
621 | kref_put(&io->refcnt, fuse_io_release); | |
01e9d11a MP |
622 | } |
623 | ||
624 | static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_req *req) | |
625 | { | |
626 | struct fuse_io_priv *io = req->io; | |
627 | ssize_t pos = -1; | |
628 | ||
61c12b49 | 629 | fuse_release_user_pages(req, io->should_dirty); |
01e9d11a MP |
630 | |
631 | if (io->write) { | |
632 | if (req->misc.write.in.size != req->misc.write.out.size) | |
633 | pos = req->misc.write.in.offset - io->offset + | |
634 | req->misc.write.out.size; | |
635 | } else { | |
636 | if (req->misc.read.in.size != req->out.args[0].size) | |
637 | pos = req->misc.read.in.offset - io->offset + | |
638 | req->out.args[0].size; | |
639 | } | |
640 | ||
641 | fuse_aio_complete(io, req->out.h.error, pos); | |
642 | } | |
643 | ||
644 | static size_t fuse_async_req_send(struct fuse_conn *fc, struct fuse_req *req, | |
645 | size_t num_bytes, struct fuse_io_priv *io) | |
646 | { | |
647 | spin_lock(&io->lock); | |
744742d6 | 648 | kref_get(&io->refcnt); |
01e9d11a MP |
649 | io->size += num_bytes; |
650 | io->reqs++; | |
651 | spin_unlock(&io->lock); | |
652 | ||
653 | req->io = io; | |
654 | req->end = fuse_aio_complete_req; | |
655 | ||
36cf66ed | 656 | __fuse_get_request(req); |
01e9d11a MP |
657 | fuse_request_send_background(fc, req); |
658 | ||
659 | return num_bytes; | |
660 | } | |
661 | ||
36cf66ed | 662 | static size_t fuse_send_read(struct fuse_req *req, struct fuse_io_priv *io, |
2106cb18 | 663 | loff_t pos, size_t count, fl_owner_t owner) |
04730fef | 664 | { |
e1c0eecb | 665 | struct file *file = io->iocb->ki_filp; |
2106cb18 MS |
666 | struct fuse_file *ff = file->private_data; |
667 | struct fuse_conn *fc = ff->fc; | |
f3332114 | 668 | |
2106cb18 | 669 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
f3332114 | 670 | if (owner != NULL) { |
5c5c5e51 | 671 | struct fuse_read_in *inarg = &req->misc.read.in; |
f3332114 MS |
672 | |
673 | inarg->read_flags |= FUSE_READ_LOCKOWNER; | |
674 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
675 | } | |
36cf66ed MP |
676 | |
677 | if (io->async) | |
678 | return fuse_async_req_send(fc, req, count, io); | |
679 | ||
b93f858a | 680 | fuse_request_send(fc, req); |
361b1eb5 | 681 | return req->out.args[0].size; |
04730fef MS |
682 | } |
683 | ||
5c5c5e51 MS |
684 | static void fuse_read_update_size(struct inode *inode, loff_t size, |
685 | u64 attr_ver) | |
686 | { | |
687 | struct fuse_conn *fc = get_fuse_conn(inode); | |
688 | struct fuse_inode *fi = get_fuse_inode(inode); | |
689 | ||
f15ecfef | 690 | spin_lock(&fi->lock); |
06a7c3c2 MP |
691 | if (attr_ver == fi->attr_version && size < inode->i_size && |
692 | !test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
4510d86f | 693 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
5c5c5e51 MS |
694 | i_size_write(inode, size); |
695 | } | |
f15ecfef | 696 | spin_unlock(&fi->lock); |
5c5c5e51 MS |
697 | } |
698 | ||
a92adc82 PE |
699 | static void fuse_short_read(struct fuse_req *req, struct inode *inode, |
700 | u64 attr_ver) | |
701 | { | |
702 | size_t num_read = req->out.args[0].size; | |
8373200b PE |
703 | struct fuse_conn *fc = get_fuse_conn(inode); |
704 | ||
705 | if (fc->writeback_cache) { | |
706 | /* | |
707 | * A hole in a file. Some data after the hole are in page cache, | |
708 | * but have not reached the client fs yet. So, the hole is not | |
709 | * present there. | |
710 | */ | |
711 | int i; | |
09cbfeaf KS |
712 | int start_idx = num_read >> PAGE_SHIFT; |
713 | size_t off = num_read & (PAGE_SIZE - 1); | |
a92adc82 | 714 | |
8373200b | 715 | for (i = start_idx; i < req->num_pages; i++) { |
09cbfeaf | 716 | zero_user_segment(req->pages[i], off, PAGE_SIZE); |
8373200b PE |
717 | off = 0; |
718 | } | |
719 | } else { | |
720 | loff_t pos = page_offset(req->pages[0]) + num_read; | |
721 | fuse_read_update_size(inode, pos, attr_ver); | |
722 | } | |
a92adc82 PE |
723 | } |
724 | ||
482fce55 | 725 | static int fuse_do_readpage(struct file *file, struct page *page) |
b6aeaded | 726 | { |
e1c0eecb MS |
727 | struct kiocb iocb; |
728 | struct fuse_io_priv io; | |
b6aeaded MS |
729 | struct inode *inode = page->mapping->host; |
730 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 | 731 | struct fuse_req *req; |
5c5c5e51 MS |
732 | size_t num_read; |
733 | loff_t pos = page_offset(page); | |
09cbfeaf | 734 | size_t count = PAGE_SIZE; |
5c5c5e51 | 735 | u64 attr_ver; |
248d86e8 MS |
736 | int err; |
737 | ||
3be5a52b | 738 | /* |
25985edc | 739 | * Page writeback can extend beyond the lifetime of the |
3be5a52b MS |
740 | * page-cache page, so make sure we read a properly synced |
741 | * page. | |
742 | */ | |
743 | fuse_wait_on_page_writeback(inode, page->index); | |
744 | ||
b111c8c0 | 745 | req = fuse_get_req(fc, 1); |
ce1d5a49 | 746 | if (IS_ERR(req)) |
482fce55 | 747 | return PTR_ERR(req); |
b6aeaded | 748 | |
5c5c5e51 MS |
749 | attr_ver = fuse_get_attr_version(fc); |
750 | ||
b6aeaded | 751 | req->out.page_zeroing = 1; |
f4975c67 | 752 | req->out.argpages = 1; |
b6aeaded MS |
753 | req->num_pages = 1; |
754 | req->pages[0] = page; | |
85f40aec | 755 | req->page_descs[0].length = count; |
e1c0eecb MS |
756 | init_sync_kiocb(&iocb, file); |
757 | io = (struct fuse_io_priv) FUSE_IO_PRIV_SYNC(&iocb); | |
36cf66ed | 758 | num_read = fuse_send_read(req, &io, pos, count, NULL); |
b6aeaded | 759 | err = req->out.h.error; |
5c5c5e51 MS |
760 | |
761 | if (!err) { | |
762 | /* | |
763 | * Short read means EOF. If file size is larger, truncate it | |
764 | */ | |
765 | if (num_read < count) | |
a92adc82 | 766 | fuse_short_read(req, inode, attr_ver); |
5c5c5e51 | 767 | |
b6aeaded | 768 | SetPageUptodate(page); |
5c5c5e51 MS |
769 | } |
770 | ||
a92adc82 | 771 | fuse_put_request(fc, req); |
482fce55 MP |
772 | |
773 | return err; | |
774 | } | |
775 | ||
776 | static int fuse_readpage(struct file *file, struct page *page) | |
777 | { | |
778 | struct inode *inode = page->mapping->host; | |
779 | int err; | |
780 | ||
781 | err = -EIO; | |
782 | if (is_bad_inode(inode)) | |
783 | goto out; | |
784 | ||
785 | err = fuse_do_readpage(file, page); | |
451418fc | 786 | fuse_invalidate_atime(inode); |
b6aeaded MS |
787 | out: |
788 | unlock_page(page); | |
789 | return err; | |
790 | } | |
791 | ||
c1aa96a5 | 792 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 793 | { |
c1aa96a5 | 794 | int i; |
5c5c5e51 MS |
795 | size_t count = req->misc.read.in.size; |
796 | size_t num_read = req->out.args[0].size; | |
ce534fb0 | 797 | struct address_space *mapping = NULL; |
c1aa96a5 | 798 | |
ce534fb0 MS |
799 | for (i = 0; mapping == NULL && i < req->num_pages; i++) |
800 | mapping = req->pages[i]->mapping; | |
5c5c5e51 | 801 | |
ce534fb0 MS |
802 | if (mapping) { |
803 | struct inode *inode = mapping->host; | |
804 | ||
805 | /* | |
806 | * Short read means EOF. If file size is larger, truncate it | |
807 | */ | |
a92adc82 PE |
808 | if (!req->out.h.error && num_read < count) |
809 | fuse_short_read(req, inode, req->misc.read.attr_ver); | |
ce534fb0 | 810 | |
451418fc | 811 | fuse_invalidate_atime(inode); |
ce534fb0 | 812 | } |
c1aa96a5 | 813 | |
db50b96c MS |
814 | for (i = 0; i < req->num_pages; i++) { |
815 | struct page *page = req->pages[i]; | |
816 | if (!req->out.h.error) | |
817 | SetPageUptodate(page); | |
c1aa96a5 MS |
818 | else |
819 | SetPageError(page); | |
db50b96c | 820 | unlock_page(page); |
09cbfeaf | 821 | put_page(page); |
db50b96c | 822 | } |
c756e0a4 | 823 | if (req->ff) |
2e64ff15 | 824 | fuse_file_put(req->ff, false, false); |
c1aa96a5 MS |
825 | } |
826 | ||
2106cb18 | 827 | static void fuse_send_readpages(struct fuse_req *req, struct file *file) |
c1aa96a5 | 828 | { |
2106cb18 MS |
829 | struct fuse_file *ff = file->private_data; |
830 | struct fuse_conn *fc = ff->fc; | |
c1aa96a5 | 831 | loff_t pos = page_offset(req->pages[0]); |
09cbfeaf | 832 | size_t count = req->num_pages << PAGE_SHIFT; |
f4975c67 MS |
833 | |
834 | req->out.argpages = 1; | |
c1aa96a5 | 835 | req->out.page_zeroing = 1; |
ce534fb0 | 836 | req->out.page_replace = 1; |
2106cb18 | 837 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
5c5c5e51 | 838 | req->misc.read.attr_ver = fuse_get_attr_version(fc); |
9cd68455 | 839 | if (fc->async_read) { |
c756e0a4 | 840 | req->ff = fuse_file_get(ff); |
9cd68455 | 841 | req->end = fuse_readpages_end; |
b93f858a | 842 | fuse_request_send_background(fc, req); |
9cd68455 | 843 | } else { |
b93f858a | 844 | fuse_request_send(fc, req); |
9cd68455 | 845 | fuse_readpages_end(fc, req); |
e9bb09dd | 846 | fuse_put_request(fc, req); |
9cd68455 | 847 | } |
db50b96c MS |
848 | } |
849 | ||
c756e0a4 | 850 | struct fuse_fill_data { |
db50b96c | 851 | struct fuse_req *req; |
a6643094 | 852 | struct file *file; |
db50b96c | 853 | struct inode *inode; |
f8dbdf81 | 854 | unsigned nr_pages; |
db50b96c MS |
855 | }; |
856 | ||
857 | static int fuse_readpages_fill(void *_data, struct page *page) | |
858 | { | |
c756e0a4 | 859 | struct fuse_fill_data *data = _data; |
db50b96c MS |
860 | struct fuse_req *req = data->req; |
861 | struct inode *inode = data->inode; | |
862 | struct fuse_conn *fc = get_fuse_conn(inode); | |
863 | ||
3be5a52b MS |
864 | fuse_wait_on_page_writeback(inode, page->index); |
865 | ||
db50b96c | 866 | if (req->num_pages && |
5da784cc | 867 | (req->num_pages == fc->max_pages || |
09cbfeaf | 868 | (req->num_pages + 1) * PAGE_SIZE > fc->max_read || |
db50b96c | 869 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { |
5da784cc CS |
870 | unsigned int nr_alloc = min_t(unsigned int, data->nr_pages, |
871 | fc->max_pages); | |
2106cb18 | 872 | fuse_send_readpages(req, data->file); |
8b41e671 MP |
873 | if (fc->async_read) |
874 | req = fuse_get_req_for_background(fc, nr_alloc); | |
875 | else | |
876 | req = fuse_get_req(fc, nr_alloc); | |
877 | ||
878 | data->req = req; | |
ce1d5a49 | 879 | if (IS_ERR(req)) { |
db50b96c | 880 | unlock_page(page); |
ce1d5a49 | 881 | return PTR_ERR(req); |
db50b96c | 882 | } |
db50b96c | 883 | } |
f8dbdf81 MP |
884 | |
885 | if (WARN_ON(req->num_pages >= req->max_pages)) { | |
109728cc | 886 | unlock_page(page); |
f8dbdf81 MP |
887 | fuse_put_request(fc, req); |
888 | return -EIO; | |
889 | } | |
890 | ||
09cbfeaf | 891 | get_page(page); |
db50b96c | 892 | req->pages[req->num_pages] = page; |
85f40aec | 893 | req->page_descs[req->num_pages].length = PAGE_SIZE; |
1729a16c | 894 | req->num_pages++; |
f8dbdf81 | 895 | data->nr_pages--; |
db50b96c MS |
896 | return 0; |
897 | } | |
898 | ||
899 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
900 | struct list_head *pages, unsigned nr_pages) | |
901 | { | |
902 | struct inode *inode = mapping->host; | |
903 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 904 | struct fuse_fill_data data; |
db50b96c | 905 | int err; |
5da784cc | 906 | unsigned int nr_alloc = min_t(unsigned int, nr_pages, fc->max_pages); |
248d86e8 | 907 | |
1d7ea732 | 908 | err = -EIO; |
248d86e8 | 909 | if (is_bad_inode(inode)) |
2e990021 | 910 | goto out; |
248d86e8 | 911 | |
a6643094 | 912 | data.file = file; |
db50b96c | 913 | data.inode = inode; |
8b41e671 MP |
914 | if (fc->async_read) |
915 | data.req = fuse_get_req_for_background(fc, nr_alloc); | |
916 | else | |
917 | data.req = fuse_get_req(fc, nr_alloc); | |
f8dbdf81 | 918 | data.nr_pages = nr_pages; |
1d7ea732 | 919 | err = PTR_ERR(data.req); |
ce1d5a49 | 920 | if (IS_ERR(data.req)) |
2e990021 | 921 | goto out; |
db50b96c MS |
922 | |
923 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
924 | if (!err) { |
925 | if (data.req->num_pages) | |
2106cb18 | 926 | fuse_send_readpages(data.req, file); |
d3406ffa MS |
927 | else |
928 | fuse_put_request(fc, data.req); | |
929 | } | |
2e990021 | 930 | out: |
1d7ea732 | 931 | return err; |
db50b96c MS |
932 | } |
933 | ||
55752a3a | 934 | static ssize_t fuse_cache_read_iter(struct kiocb *iocb, struct iov_iter *to) |
bcb4be80 MS |
935 | { |
936 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
a8894274 | 937 | struct fuse_conn *fc = get_fuse_conn(inode); |
bcb4be80 | 938 | |
a8894274 BF |
939 | /* |
940 | * In auto invalidate mode, always update attributes on read. | |
941 | * Otherwise, only update if we attempt to read past EOF (to ensure | |
942 | * i_size is up to date). | |
943 | */ | |
944 | if (fc->auto_inval_data || | |
37c20f16 | 945 | (iocb->ki_pos + iov_iter_count(to) > i_size_read(inode))) { |
bcb4be80 | 946 | int err; |
5b97eeac | 947 | err = fuse_update_attributes(inode, iocb->ki_filp); |
bcb4be80 MS |
948 | if (err) |
949 | return err; | |
950 | } | |
951 | ||
37c20f16 | 952 | return generic_file_read_iter(iocb, to); |
bcb4be80 MS |
953 | } |
954 | ||
2d698b07 | 955 | static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, |
2106cb18 | 956 | loff_t pos, size_t count) |
b6aeaded | 957 | { |
b25e82e5 MS |
958 | struct fuse_write_in *inarg = &req->misc.write.in; |
959 | struct fuse_write_out *outarg = &req->misc.write.out; | |
b6aeaded | 960 | |
b25e82e5 MS |
961 | inarg->fh = ff->fh; |
962 | inarg->offset = pos; | |
963 | inarg->size = count; | |
b6aeaded | 964 | req->in.h.opcode = FUSE_WRITE; |
2106cb18 | 965 | req->in.h.nodeid = ff->nodeid; |
b6aeaded | 966 | req->in.numargs = 2; |
2106cb18 | 967 | if (ff->fc->minor < 9) |
f3332114 MS |
968 | req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; |
969 | else | |
970 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
b25e82e5 | 971 | req->in.args[0].value = inarg; |
b6aeaded MS |
972 | req->in.args[1].size = count; |
973 | req->out.numargs = 1; | |
974 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
b25e82e5 MS |
975 | req->out.args[0].value = outarg; |
976 | } | |
977 | ||
36cf66ed | 978 | static size_t fuse_send_write(struct fuse_req *req, struct fuse_io_priv *io, |
2106cb18 | 979 | loff_t pos, size_t count, fl_owner_t owner) |
b25e82e5 | 980 | { |
e1c0eecb MS |
981 | struct kiocb *iocb = io->iocb; |
982 | struct file *file = iocb->ki_filp; | |
2106cb18 MS |
983 | struct fuse_file *ff = file->private_data; |
984 | struct fuse_conn *fc = ff->fc; | |
2d698b07 MS |
985 | struct fuse_write_in *inarg = &req->misc.write.in; |
986 | ||
2106cb18 | 987 | fuse_write_fill(req, ff, pos, count); |
2d698b07 | 988 | inarg->flags = file->f_flags; |
e1c0eecb MS |
989 | if (iocb->ki_flags & IOCB_DSYNC) |
990 | inarg->flags |= O_DSYNC; | |
991 | if (iocb->ki_flags & IOCB_SYNC) | |
992 | inarg->flags |= O_SYNC; | |
f3332114 | 993 | if (owner != NULL) { |
f3332114 MS |
994 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; |
995 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
996 | } | |
36cf66ed MP |
997 | |
998 | if (io->async) | |
999 | return fuse_async_req_send(fc, req, count, io); | |
1000 | ||
b93f858a | 1001 | fuse_request_send(fc, req); |
b25e82e5 | 1002 | return req->misc.write.out.size; |
b6aeaded MS |
1003 | } |
1004 | ||
b0aa7606 | 1005 | bool fuse_write_update_size(struct inode *inode, loff_t pos) |
854512ec MS |
1006 | { |
1007 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1008 | struct fuse_inode *fi = get_fuse_inode(inode); | |
b0aa7606 | 1009 | bool ret = false; |
854512ec | 1010 | |
f15ecfef | 1011 | spin_lock(&fi->lock); |
4510d86f | 1012 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
b0aa7606 | 1013 | if (pos > inode->i_size) { |
854512ec | 1014 | i_size_write(inode, pos); |
b0aa7606 MP |
1015 | ret = true; |
1016 | } | |
f15ecfef | 1017 | spin_unlock(&fi->lock); |
b0aa7606 MP |
1018 | |
1019 | return ret; | |
854512ec MS |
1020 | } |
1021 | ||
e1c0eecb | 1022 | static size_t fuse_send_write_pages(struct fuse_req *req, struct kiocb *iocb, |
ea9b9907 NP |
1023 | struct inode *inode, loff_t pos, |
1024 | size_t count) | |
1025 | { | |
1026 | size_t res; | |
1027 | unsigned offset; | |
1028 | unsigned i; | |
e1c0eecb | 1029 | struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb); |
ea9b9907 NP |
1030 | |
1031 | for (i = 0; i < req->num_pages; i++) | |
1032 | fuse_wait_on_page_writeback(inode, req->pages[i]->index); | |
1033 | ||
36cf66ed | 1034 | res = fuse_send_write(req, &io, pos, count, NULL); |
ea9b9907 | 1035 | |
b2430d75 | 1036 | offset = req->page_descs[0].offset; |
ea9b9907 NP |
1037 | count = res; |
1038 | for (i = 0; i < req->num_pages; i++) { | |
1039 | struct page *page = req->pages[i]; | |
1040 | ||
09cbfeaf | 1041 | if (!req->out.h.error && !offset && count >= PAGE_SIZE) |
ea9b9907 NP |
1042 | SetPageUptodate(page); |
1043 | ||
09cbfeaf KS |
1044 | if (count > PAGE_SIZE - offset) |
1045 | count -= PAGE_SIZE - offset; | |
ea9b9907 NP |
1046 | else |
1047 | count = 0; | |
1048 | offset = 0; | |
1049 | ||
1050 | unlock_page(page); | |
09cbfeaf | 1051 | put_page(page); |
ea9b9907 NP |
1052 | } |
1053 | ||
1054 | return res; | |
1055 | } | |
1056 | ||
1057 | static ssize_t fuse_fill_write_pages(struct fuse_req *req, | |
1058 | struct address_space *mapping, | |
1059 | struct iov_iter *ii, loff_t pos) | |
1060 | { | |
1061 | struct fuse_conn *fc = get_fuse_conn(mapping->host); | |
09cbfeaf | 1062 | unsigned offset = pos & (PAGE_SIZE - 1); |
ea9b9907 NP |
1063 | size_t count = 0; |
1064 | int err; | |
1065 | ||
f4975c67 | 1066 | req->in.argpages = 1; |
b2430d75 | 1067 | req->page_descs[0].offset = offset; |
ea9b9907 NP |
1068 | |
1069 | do { | |
1070 | size_t tmp; | |
1071 | struct page *page; | |
09cbfeaf KS |
1072 | pgoff_t index = pos >> PAGE_SHIFT; |
1073 | size_t bytes = min_t(size_t, PAGE_SIZE - offset, | |
ea9b9907 NP |
1074 | iov_iter_count(ii)); |
1075 | ||
1076 | bytes = min_t(size_t, bytes, fc->max_write - count); | |
1077 | ||
1078 | again: | |
1079 | err = -EFAULT; | |
1080 | if (iov_iter_fault_in_readable(ii, bytes)) | |
1081 | break; | |
1082 | ||
1083 | err = -ENOMEM; | |
54566b2c | 1084 | page = grab_cache_page_write_begin(mapping, index, 0); |
ea9b9907 NP |
1085 | if (!page) |
1086 | break; | |
1087 | ||
931e80e4 | 1088 | if (mapping_writably_mapped(mapping)) |
1089 | flush_dcache_page(page); | |
1090 | ||
ea9b9907 | 1091 | tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); |
ea9b9907 NP |
1092 | flush_dcache_page(page); |
1093 | ||
3ca8138f | 1094 | iov_iter_advance(ii, tmp); |
ea9b9907 NP |
1095 | if (!tmp) { |
1096 | unlock_page(page); | |
09cbfeaf | 1097 | put_page(page); |
ea9b9907 NP |
1098 | bytes = min(bytes, iov_iter_single_seg_count(ii)); |
1099 | goto again; | |
1100 | } | |
1101 | ||
1102 | err = 0; | |
1103 | req->pages[req->num_pages] = page; | |
85f40aec | 1104 | req->page_descs[req->num_pages].length = tmp; |
ea9b9907 NP |
1105 | req->num_pages++; |
1106 | ||
ea9b9907 NP |
1107 | count += tmp; |
1108 | pos += tmp; | |
1109 | offset += tmp; | |
09cbfeaf | 1110 | if (offset == PAGE_SIZE) |
ea9b9907 NP |
1111 | offset = 0; |
1112 | ||
78bb6cb9 MS |
1113 | if (!fc->big_writes) |
1114 | break; | |
ea9b9907 | 1115 | } while (iov_iter_count(ii) && count < fc->max_write && |
d07f09f5 | 1116 | req->num_pages < req->max_pages && offset == 0); |
ea9b9907 NP |
1117 | |
1118 | return count > 0 ? count : err; | |
1119 | } | |
1120 | ||
5da784cc CS |
1121 | static inline unsigned int fuse_wr_pages(loff_t pos, size_t len, |
1122 | unsigned int max_pages) | |
d07f09f5 | 1123 | { |
5da784cc | 1124 | return min_t(unsigned int, |
09cbfeaf KS |
1125 | ((pos + len - 1) >> PAGE_SHIFT) - |
1126 | (pos >> PAGE_SHIFT) + 1, | |
5da784cc | 1127 | max_pages); |
d07f09f5 MP |
1128 | } |
1129 | ||
e1c0eecb | 1130 | static ssize_t fuse_perform_write(struct kiocb *iocb, |
ea9b9907 NP |
1131 | struct address_space *mapping, |
1132 | struct iov_iter *ii, loff_t pos) | |
1133 | { | |
1134 | struct inode *inode = mapping->host; | |
1135 | struct fuse_conn *fc = get_fuse_conn(inode); | |
06a7c3c2 | 1136 | struct fuse_inode *fi = get_fuse_inode(inode); |
ea9b9907 NP |
1137 | int err = 0; |
1138 | ssize_t res = 0; | |
1139 | ||
06a7c3c2 MP |
1140 | if (inode->i_size < pos + iov_iter_count(ii)) |
1141 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
1142 | ||
ea9b9907 NP |
1143 | do { |
1144 | struct fuse_req *req; | |
1145 | ssize_t count; | |
5da784cc CS |
1146 | unsigned int nr_pages = fuse_wr_pages(pos, iov_iter_count(ii), |
1147 | fc->max_pages); | |
ea9b9907 | 1148 | |
d07f09f5 | 1149 | req = fuse_get_req(fc, nr_pages); |
ea9b9907 NP |
1150 | if (IS_ERR(req)) { |
1151 | err = PTR_ERR(req); | |
1152 | break; | |
1153 | } | |
1154 | ||
1155 | count = fuse_fill_write_pages(req, mapping, ii, pos); | |
1156 | if (count <= 0) { | |
1157 | err = count; | |
1158 | } else { | |
1159 | size_t num_written; | |
1160 | ||
e1c0eecb | 1161 | num_written = fuse_send_write_pages(req, iocb, inode, |
ea9b9907 NP |
1162 | pos, count); |
1163 | err = req->out.h.error; | |
1164 | if (!err) { | |
1165 | res += num_written; | |
1166 | pos += num_written; | |
1167 | ||
1168 | /* break out of the loop on short write */ | |
1169 | if (num_written != count) | |
1170 | err = -EIO; | |
1171 | } | |
1172 | } | |
1173 | fuse_put_request(fc, req); | |
1174 | } while (!err && iov_iter_count(ii)); | |
1175 | ||
1176 | if (res > 0) | |
1177 | fuse_write_update_size(inode, pos); | |
1178 | ||
06a7c3c2 | 1179 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
ea9b9907 NP |
1180 | fuse_invalidate_attr(inode); |
1181 | ||
1182 | return res > 0 ? res : err; | |
1183 | } | |
1184 | ||
55752a3a | 1185 | static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ea9b9907 NP |
1186 | { |
1187 | struct file *file = iocb->ki_filp; | |
1188 | struct address_space *mapping = file->f_mapping; | |
ea9b9907 | 1189 | ssize_t written = 0; |
4273b793 | 1190 | ssize_t written_buffered = 0; |
ea9b9907 NP |
1191 | struct inode *inode = mapping->host; |
1192 | ssize_t err; | |
4273b793 | 1193 | loff_t endbyte = 0; |
ea9b9907 | 1194 | |
4d99ff8f PE |
1195 | if (get_fuse_conn(inode)->writeback_cache) { |
1196 | /* Update size (EOF optimization) and mode (SUID clearing) */ | |
5b97eeac | 1197 | err = fuse_update_attributes(mapping->host, file); |
4d99ff8f PE |
1198 | if (err) |
1199 | return err; | |
1200 | ||
84c3d55c | 1201 | return generic_file_write_iter(iocb, from); |
4d99ff8f PE |
1202 | } |
1203 | ||
5955102c | 1204 | inode_lock(inode); |
ea9b9907 NP |
1205 | |
1206 | /* We can write back this queue in page reclaim */ | |
de1414a6 | 1207 | current->backing_dev_info = inode_to_bdi(inode); |
ea9b9907 | 1208 | |
3309dd04 AV |
1209 | err = generic_write_checks(iocb, from); |
1210 | if (err <= 0) | |
ea9b9907 NP |
1211 | goto out; |
1212 | ||
5fa8e0a1 | 1213 | err = file_remove_privs(file); |
ea9b9907 NP |
1214 | if (err) |
1215 | goto out; | |
1216 | ||
c3b2da31 JB |
1217 | err = file_update_time(file); |
1218 | if (err) | |
1219 | goto out; | |
ea9b9907 | 1220 | |
2ba48ce5 | 1221 | if (iocb->ki_flags & IOCB_DIRECT) { |
3309dd04 | 1222 | loff_t pos = iocb->ki_pos; |
1af5bb49 | 1223 | written = generic_file_direct_write(iocb, from); |
84c3d55c | 1224 | if (written < 0 || !iov_iter_count(from)) |
4273b793 AA |
1225 | goto out; |
1226 | ||
1227 | pos += written; | |
ea9b9907 | 1228 | |
e1c0eecb | 1229 | written_buffered = fuse_perform_write(iocb, mapping, from, pos); |
4273b793 AA |
1230 | if (written_buffered < 0) { |
1231 | err = written_buffered; | |
1232 | goto out; | |
1233 | } | |
1234 | endbyte = pos + written_buffered - 1; | |
1235 | ||
1236 | err = filemap_write_and_wait_range(file->f_mapping, pos, | |
1237 | endbyte); | |
1238 | if (err) | |
1239 | goto out; | |
1240 | ||
1241 | invalidate_mapping_pages(file->f_mapping, | |
09cbfeaf KS |
1242 | pos >> PAGE_SHIFT, |
1243 | endbyte >> PAGE_SHIFT); | |
4273b793 AA |
1244 | |
1245 | written += written_buffered; | |
1246 | iocb->ki_pos = pos + written_buffered; | |
1247 | } else { | |
e1c0eecb | 1248 | written = fuse_perform_write(iocb, mapping, from, iocb->ki_pos); |
4273b793 | 1249 | if (written >= 0) |
3309dd04 | 1250 | iocb->ki_pos += written; |
4273b793 | 1251 | } |
ea9b9907 NP |
1252 | out: |
1253 | current->backing_dev_info = NULL; | |
5955102c | 1254 | inode_unlock(inode); |
e1c0eecb MS |
1255 | if (written > 0) |
1256 | written = generic_write_sync(iocb, written); | |
ea9b9907 NP |
1257 | |
1258 | return written ? written : err; | |
1259 | } | |
1260 | ||
7c190c8b MP |
1261 | static inline void fuse_page_descs_length_init(struct fuse_req *req, |
1262 | unsigned index, unsigned nr_pages) | |
85f40aec MP |
1263 | { |
1264 | int i; | |
1265 | ||
7c190c8b | 1266 | for (i = index; i < index + nr_pages; i++) |
85f40aec MP |
1267 | req->page_descs[i].length = PAGE_SIZE - |
1268 | req->page_descs[i].offset; | |
1269 | } | |
1270 | ||
7c190c8b MP |
1271 | static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii) |
1272 | { | |
1273 | return (unsigned long)ii->iov->iov_base + ii->iov_offset; | |
1274 | } | |
1275 | ||
1276 | static inline size_t fuse_get_frag_size(const struct iov_iter *ii, | |
1277 | size_t max_size) | |
1278 | { | |
1279 | return min(iov_iter_single_seg_count(ii), max_size); | |
1280 | } | |
1281 | ||
b98d023a | 1282 | static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii, |
ce60a2f1 | 1283 | size_t *nbytesp, int write) |
413ef8cb | 1284 | { |
7c190c8b | 1285 | size_t nbytes = 0; /* # bytes already packed in req */ |
742f9927 | 1286 | ssize_t ret = 0; |
b98d023a | 1287 | |
f4975c67 | 1288 | /* Special case for kernel I/O: can copy directly into the buffer */ |
00e23707 | 1289 | if (iov_iter_is_kvec(ii)) { |
7c190c8b MP |
1290 | unsigned long user_addr = fuse_get_user_addr(ii); |
1291 | size_t frag_size = fuse_get_frag_size(ii, *nbytesp); | |
1292 | ||
f4975c67 MS |
1293 | if (write) |
1294 | req->in.args[1].value = (void *) user_addr; | |
1295 | else | |
1296 | req->out.args[0].value = (void *) user_addr; | |
1297 | ||
b98d023a MP |
1298 | iov_iter_advance(ii, frag_size); |
1299 | *nbytesp = frag_size; | |
f4975c67 MS |
1300 | return 0; |
1301 | } | |
413ef8cb | 1302 | |
5565a9d8 | 1303 | while (nbytes < *nbytesp && req->num_pages < req->max_pages) { |
7c190c8b | 1304 | unsigned npages; |
f67da30c | 1305 | size_t start; |
742f9927 | 1306 | ret = iov_iter_get_pages(ii, &req->pages[req->num_pages], |
2c80929c | 1307 | *nbytesp - nbytes, |
c7f3888a AV |
1308 | req->max_pages - req->num_pages, |
1309 | &start); | |
7c190c8b | 1310 | if (ret < 0) |
742f9927 | 1311 | break; |
7c190c8b | 1312 | |
c9c37e2e AV |
1313 | iov_iter_advance(ii, ret); |
1314 | nbytes += ret; | |
7c190c8b | 1315 | |
c9c37e2e AV |
1316 | ret += start; |
1317 | npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE; | |
7c190c8b | 1318 | |
c9c37e2e | 1319 | req->page_descs[req->num_pages].offset = start; |
7c190c8b MP |
1320 | fuse_page_descs_length_init(req, req->num_pages, npages); |
1321 | ||
1322 | req->num_pages += npages; | |
1323 | req->page_descs[req->num_pages - 1].length -= | |
c9c37e2e | 1324 | (PAGE_SIZE - ret) & (PAGE_SIZE - 1); |
7c190c8b | 1325 | } |
f4975c67 MS |
1326 | |
1327 | if (write) | |
1328 | req->in.argpages = 1; | |
1329 | else | |
1330 | req->out.argpages = 1; | |
1331 | ||
7c190c8b | 1332 | *nbytesp = nbytes; |
f4975c67 | 1333 | |
2c932d4c | 1334 | return ret < 0 ? ret : 0; |
413ef8cb MS |
1335 | } |
1336 | ||
d22a943f AV |
1337 | ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, |
1338 | loff_t *ppos, int flags) | |
413ef8cb | 1339 | { |
ea8cd333 PE |
1340 | int write = flags & FUSE_DIO_WRITE; |
1341 | int cuse = flags & FUSE_DIO_CUSE; | |
e1c0eecb | 1342 | struct file *file = io->iocb->ki_filp; |
ea8cd333 | 1343 | struct inode *inode = file->f_mapping->host; |
2106cb18 MS |
1344 | struct fuse_file *ff = file->private_data; |
1345 | struct fuse_conn *fc = ff->fc; | |
413ef8cb MS |
1346 | size_t nmax = write ? fc->max_write : fc->max_read; |
1347 | loff_t pos = *ppos; | |
d22a943f | 1348 | size_t count = iov_iter_count(iter); |
09cbfeaf KS |
1349 | pgoff_t idx_from = pos >> PAGE_SHIFT; |
1350 | pgoff_t idx_to = (pos + count - 1) >> PAGE_SHIFT; | |
413ef8cb | 1351 | ssize_t res = 0; |
248d86e8 | 1352 | struct fuse_req *req; |
742f9927 | 1353 | int err = 0; |
248d86e8 | 1354 | |
de82b923 | 1355 | if (io->async) |
5da784cc CS |
1356 | req = fuse_get_req_for_background(fc, iov_iter_npages(iter, |
1357 | fc->max_pages)); | |
de82b923 | 1358 | else |
5da784cc | 1359 | req = fuse_get_req(fc, iov_iter_npages(iter, fc->max_pages)); |
ce1d5a49 MS |
1360 | if (IS_ERR(req)) |
1361 | return PTR_ERR(req); | |
413ef8cb | 1362 | |
ea8cd333 PE |
1363 | if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) { |
1364 | if (!write) | |
5955102c | 1365 | inode_lock(inode); |
ea8cd333 PE |
1366 | fuse_sync_writes(inode); |
1367 | if (!write) | |
5955102c | 1368 | inode_unlock(inode); |
ea8cd333 PE |
1369 | } |
1370 | ||
61c12b49 | 1371 | io->should_dirty = !write && iter_is_iovec(iter); |
413ef8cb | 1372 | while (count) { |
413ef8cb | 1373 | size_t nres; |
2106cb18 | 1374 | fl_owner_t owner = current->files; |
f4975c67 | 1375 | size_t nbytes = min(count, nmax); |
742f9927 AS |
1376 | err = fuse_get_user_pages(req, iter, &nbytes, write); |
1377 | if (err && !nbytes) | |
413ef8cb | 1378 | break; |
f4975c67 | 1379 | |
4a2abf99 MS |
1380 | if (write) { |
1381 | if (!capable(CAP_FSETID)) { | |
1382 | struct fuse_write_in *inarg; | |
1383 | ||
1384 | inarg = &req->misc.write.in; | |
1385 | inarg->write_flags |= FUSE_WRITE_KILL_PRIV; | |
1386 | } | |
36cf66ed | 1387 | nres = fuse_send_write(req, io, pos, nbytes, owner); |
4a2abf99 | 1388 | } else { |
36cf66ed | 1389 | nres = fuse_send_read(req, io, pos, nbytes, owner); |
4a2abf99 | 1390 | } |
2106cb18 | 1391 | |
36cf66ed | 1392 | if (!io->async) |
61c12b49 | 1393 | fuse_release_user_pages(req, io->should_dirty); |
413ef8cb | 1394 | if (req->out.h.error) { |
742f9927 | 1395 | err = req->out.h.error; |
413ef8cb MS |
1396 | break; |
1397 | } else if (nres > nbytes) { | |
742f9927 AS |
1398 | res = 0; |
1399 | err = -EIO; | |
413ef8cb MS |
1400 | break; |
1401 | } | |
1402 | count -= nres; | |
1403 | res += nres; | |
1404 | pos += nres; | |
413ef8cb MS |
1405 | if (nres != nbytes) |
1406 | break; | |
56cf34ff MS |
1407 | if (count) { |
1408 | fuse_put_request(fc, req); | |
de82b923 BF |
1409 | if (io->async) |
1410 | req = fuse_get_req_for_background(fc, | |
5da784cc | 1411 | iov_iter_npages(iter, fc->max_pages)); |
de82b923 | 1412 | else |
5da784cc CS |
1413 | req = fuse_get_req(fc, iov_iter_npages(iter, |
1414 | fc->max_pages)); | |
56cf34ff MS |
1415 | if (IS_ERR(req)) |
1416 | break; | |
1417 | } | |
413ef8cb | 1418 | } |
f60311d5 AA |
1419 | if (!IS_ERR(req)) |
1420 | fuse_put_request(fc, req); | |
d09cb9d7 | 1421 | if (res > 0) |
413ef8cb | 1422 | *ppos = pos; |
413ef8cb | 1423 | |
742f9927 | 1424 | return res > 0 ? res : err; |
413ef8cb | 1425 | } |
08cbf542 | 1426 | EXPORT_SYMBOL_GPL(fuse_direct_io); |
413ef8cb | 1427 | |
36cf66ed | 1428 | static ssize_t __fuse_direct_read(struct fuse_io_priv *io, |
d22a943f AV |
1429 | struct iov_iter *iter, |
1430 | loff_t *ppos) | |
413ef8cb | 1431 | { |
d09cb9d7 | 1432 | ssize_t res; |
e1c0eecb | 1433 | struct inode *inode = file_inode(io->iocb->ki_filp); |
d09cb9d7 | 1434 | |
d22a943f | 1435 | res = fuse_direct_io(io, iter, ppos, 0); |
d09cb9d7 | 1436 | |
9a2eb24d | 1437 | fuse_invalidate_atime(inode); |
d09cb9d7 MS |
1438 | |
1439 | return res; | |
413ef8cb MS |
1440 | } |
1441 | ||
23c94e1c MR |
1442 | static ssize_t fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter); |
1443 | ||
15316263 | 1444 | static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to) |
b98d023a | 1445 | { |
23c94e1c MR |
1446 | ssize_t res; |
1447 | ||
1448 | if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) { | |
23c94e1c MR |
1449 | res = fuse_direct_IO(iocb, to); |
1450 | } else { | |
1451 | struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb); | |
1452 | ||
1453 | res = __fuse_direct_read(&io, to, &iocb->ki_pos); | |
1454 | } | |
1455 | ||
1456 | return res; | |
b98d023a MP |
1457 | } |
1458 | ||
15316263 | 1459 | static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from) |
4273b793 | 1460 | { |
e1c0eecb MS |
1461 | struct inode *inode = file_inode(iocb->ki_filp); |
1462 | struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb); | |
15316263 | 1463 | ssize_t res; |
4273b793 | 1464 | |
4273b793 | 1465 | /* Don't allow parallel writes to the same file */ |
5955102c | 1466 | inode_lock(inode); |
3309dd04 | 1467 | res = generic_write_checks(iocb, from); |
23c94e1c MR |
1468 | if (res > 0) { |
1469 | if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) { | |
1470 | res = fuse_direct_IO(iocb, from); | |
1471 | } else { | |
1472 | res = fuse_direct_io(&io, from, &iocb->ki_pos, | |
1473 | FUSE_DIO_WRITE); | |
1474 | } | |
1475 | } | |
812408fb | 1476 | fuse_invalidate_attr(inode); |
bcba24cc | 1477 | if (res > 0) |
15316263 | 1478 | fuse_write_update_size(inode, iocb->ki_pos); |
5955102c | 1479 | inode_unlock(inode); |
4273b793 AA |
1480 | |
1481 | return res; | |
1482 | } | |
1483 | ||
55752a3a MS |
1484 | static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1485 | { | |
2f7b6f5b MS |
1486 | struct file *file = iocb->ki_filp; |
1487 | struct fuse_file *ff = file->private_data; | |
1488 | ||
1489 | if (is_bad_inode(file_inode(file))) | |
1490 | return -EIO; | |
55752a3a MS |
1491 | |
1492 | if (!(ff->open_flags & FOPEN_DIRECT_IO)) | |
1493 | return fuse_cache_read_iter(iocb, to); | |
1494 | else | |
1495 | return fuse_direct_read_iter(iocb, to); | |
1496 | } | |
1497 | ||
1498 | static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) | |
1499 | { | |
2f7b6f5b MS |
1500 | struct file *file = iocb->ki_filp; |
1501 | struct fuse_file *ff = file->private_data; | |
1502 | ||
1503 | if (is_bad_inode(file_inode(file))) | |
1504 | return -EIO; | |
55752a3a MS |
1505 | |
1506 | if (!(ff->open_flags & FOPEN_DIRECT_IO)) | |
1507 | return fuse_cache_write_iter(iocb, from); | |
1508 | else | |
1509 | return fuse_direct_write_iter(iocb, from); | |
1510 | } | |
1511 | ||
3be5a52b | 1512 | static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req) |
b6aeaded | 1513 | { |
385b1268 PE |
1514 | int i; |
1515 | ||
1516 | for (i = 0; i < req->num_pages; i++) | |
1517 | __free_page(req->pages[i]); | |
8b284dc4 MS |
1518 | |
1519 | if (req->ff) | |
2e64ff15 | 1520 | fuse_file_put(req->ff, false, false); |
3be5a52b MS |
1521 | } |
1522 | ||
1523 | static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) | |
1524 | { | |
1525 | struct inode *inode = req->inode; | |
1526 | struct fuse_inode *fi = get_fuse_inode(inode); | |
de1414a6 | 1527 | struct backing_dev_info *bdi = inode_to_bdi(inode); |
385b1268 | 1528 | int i; |
3be5a52b MS |
1529 | |
1530 | list_del(&req->writepages_entry); | |
385b1268 | 1531 | for (i = 0; i < req->num_pages; i++) { |
93f78d88 | 1532 | dec_wb_stat(&bdi->wb, WB_WRITEBACK); |
11fb9989 | 1533 | dec_node_page_state(req->pages[i], NR_WRITEBACK_TEMP); |
93f78d88 | 1534 | wb_writeout_inc(&bdi->wb); |
385b1268 | 1535 | } |
3be5a52b MS |
1536 | wake_up(&fi->page_waitq); |
1537 | } | |
1538 | ||
f15ecfef | 1539 | /* Called under fi->lock, may release and reacquire it */ |
6eaf4782 MP |
1540 | static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req, |
1541 | loff_t size) | |
f15ecfef KT |
1542 | __releases(fi->lock) |
1543 | __acquires(fi->lock) | |
3be5a52b | 1544 | { |
e2653bd5 | 1545 | struct fuse_req *aux, *next; |
3be5a52b | 1546 | struct fuse_inode *fi = get_fuse_inode(req->inode); |
3be5a52b | 1547 | struct fuse_write_in *inarg = &req->misc.write.in; |
09cbfeaf | 1548 | __u64 data_size = req->num_pages * PAGE_SIZE; |
63825b4e | 1549 | bool queued; |
3be5a52b | 1550 | |
385b1268 PE |
1551 | if (inarg->offset + data_size <= size) { |
1552 | inarg->size = data_size; | |
3be5a52b | 1553 | } else if (inarg->offset < size) { |
385b1268 | 1554 | inarg->size = size - inarg->offset; |
3be5a52b MS |
1555 | } else { |
1556 | /* Got truncated off completely */ | |
1557 | goto out_free; | |
b6aeaded | 1558 | } |
3be5a52b MS |
1559 | |
1560 | req->in.args[1].size = inarg->size; | |
63825b4e | 1561 | queued = fuse_request_queue_background(fc, req); |
f15ecfef KT |
1562 | /* Fails on broken connection only */ |
1563 | if (unlikely(!queued)) | |
1564 | goto out_free; | |
1565 | ||
1566 | fi->writectr++; | |
3be5a52b MS |
1567 | return; |
1568 | ||
1569 | out_free: | |
1570 | fuse_writepage_finish(fc, req); | |
f15ecfef | 1571 | spin_unlock(&fi->lock); |
e2653bd5 MS |
1572 | |
1573 | /* After fuse_writepage_finish() aux request list is private */ | |
1574 | for (aux = req->misc.write.next; aux; aux = next) { | |
1575 | next = aux->misc.write.next; | |
1576 | aux->misc.write.next = NULL; | |
1577 | fuse_writepage_free(fc, aux); | |
1578 | fuse_put_request(fc, aux); | |
1579 | } | |
1580 | ||
3be5a52b | 1581 | fuse_writepage_free(fc, req); |
e9bb09dd | 1582 | fuse_put_request(fc, req); |
f15ecfef | 1583 | spin_lock(&fi->lock); |
b6aeaded MS |
1584 | } |
1585 | ||
3be5a52b MS |
1586 | /* |
1587 | * If fi->writectr is positive (no truncate or fsync going on) send | |
1588 | * all queued writepage requests. | |
1589 | * | |
f15ecfef | 1590 | * Called with fi->lock |
3be5a52b MS |
1591 | */ |
1592 | void fuse_flush_writepages(struct inode *inode) | |
f15ecfef KT |
1593 | __releases(fi->lock) |
1594 | __acquires(fi->lock) | |
b6aeaded | 1595 | { |
3be5a52b MS |
1596 | struct fuse_conn *fc = get_fuse_conn(inode); |
1597 | struct fuse_inode *fi = get_fuse_inode(inode); | |
9de5be06 | 1598 | loff_t crop = i_size_read(inode); |
3be5a52b MS |
1599 | struct fuse_req *req; |
1600 | ||
1601 | while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { | |
1602 | req = list_entry(fi->queued_writes.next, struct fuse_req, list); | |
1603 | list_del_init(&req->list); | |
6eaf4782 | 1604 | fuse_send_writepage(fc, req, crop); |
3be5a52b MS |
1605 | } |
1606 | } | |
1607 | ||
1608 | static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req) | |
1609 | { | |
1610 | struct inode *inode = req->inode; | |
1611 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1612 | ||
1613 | mapping_set_error(inode->i_mapping, req->out.h.error); | |
f15ecfef | 1614 | spin_lock(&fi->lock); |
8b284dc4 | 1615 | while (req->misc.write.next) { |
6eaf4782 MP |
1616 | struct fuse_conn *fc = get_fuse_conn(inode); |
1617 | struct fuse_write_in *inarg = &req->misc.write.in; | |
8b284dc4 MS |
1618 | struct fuse_req *next = req->misc.write.next; |
1619 | req->misc.write.next = next->misc.write.next; | |
1620 | next->misc.write.next = NULL; | |
ce128de6 | 1621 | next->ff = fuse_file_get(req->ff); |
8b284dc4 | 1622 | list_add(&next->writepages_entry, &fi->writepages); |
6eaf4782 MP |
1623 | |
1624 | /* | |
1625 | * Skip fuse_flush_writepages() to make it easy to crop requests | |
1626 | * based on primary request size. | |
1627 | * | |
1628 | * 1st case (trivial): there are no concurrent activities using | |
1629 | * fuse_set/release_nowrite. Then we're on safe side because | |
1630 | * fuse_flush_writepages() would call fuse_send_writepage() | |
1631 | * anyway. | |
1632 | * | |
1633 | * 2nd case: someone called fuse_set_nowrite and it is waiting | |
1634 | * now for completion of all in-flight requests. This happens | |
1635 | * rarely and no more than once per page, so this should be | |
1636 | * okay. | |
1637 | * | |
1638 | * 3rd case: someone (e.g. fuse_do_setattr()) is in the middle | |
1639 | * of fuse_set_nowrite..fuse_release_nowrite section. The fact | |
1640 | * that fuse_set_nowrite returned implies that all in-flight | |
1641 | * requests were completed along with all of their secondary | |
1642 | * requests. Further primary requests are blocked by negative | |
1643 | * writectr. Hence there cannot be any in-flight requests and | |
1644 | * no invocations of fuse_writepage_end() while we're in | |
1645 | * fuse_set_nowrite..fuse_release_nowrite section. | |
1646 | */ | |
1647 | fuse_send_writepage(fc, next, inarg->offset + inarg->size); | |
8b284dc4 | 1648 | } |
3be5a52b MS |
1649 | fi->writectr--; |
1650 | fuse_writepage_finish(fc, req); | |
f15ecfef | 1651 | spin_unlock(&fi->lock); |
3be5a52b MS |
1652 | fuse_writepage_free(fc, req); |
1653 | } | |
1654 | ||
1e18bda8 MS |
1655 | static struct fuse_file *__fuse_write_file_get(struct fuse_conn *fc, |
1656 | struct fuse_inode *fi) | |
adcadfa8 | 1657 | { |
72523425 | 1658 | struct fuse_file *ff = NULL; |
adcadfa8 | 1659 | |
f15ecfef | 1660 | spin_lock(&fi->lock); |
1e18bda8 | 1661 | if (!list_empty(&fi->write_files)) { |
72523425 MS |
1662 | ff = list_entry(fi->write_files.next, struct fuse_file, |
1663 | write_entry); | |
1664 | fuse_file_get(ff); | |
1665 | } | |
f15ecfef | 1666 | spin_unlock(&fi->lock); |
adcadfa8 PE |
1667 | |
1668 | return ff; | |
1669 | } | |
1670 | ||
1e18bda8 MS |
1671 | static struct fuse_file *fuse_write_file_get(struct fuse_conn *fc, |
1672 | struct fuse_inode *fi) | |
1673 | { | |
1674 | struct fuse_file *ff = __fuse_write_file_get(fc, fi); | |
1675 | WARN_ON(!ff); | |
1676 | return ff; | |
1677 | } | |
1678 | ||
1679 | int fuse_write_inode(struct inode *inode, struct writeback_control *wbc) | |
1680 | { | |
1681 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1682 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1683 | struct fuse_file *ff; | |
1684 | int err; | |
1685 | ||
1686 | ff = __fuse_write_file_get(fc, fi); | |
ab9e13f7 | 1687 | err = fuse_flush_times(inode, ff); |
1e18bda8 | 1688 | if (ff) |
2e64ff15 | 1689 | fuse_file_put(ff, false, false); |
1e18bda8 MS |
1690 | |
1691 | return err; | |
1692 | } | |
1693 | ||
3be5a52b MS |
1694 | static int fuse_writepage_locked(struct page *page) |
1695 | { | |
1696 | struct address_space *mapping = page->mapping; | |
1697 | struct inode *inode = mapping->host; | |
1698 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1699 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1700 | struct fuse_req *req; | |
3be5a52b | 1701 | struct page *tmp_page; |
72523425 | 1702 | int error = -ENOMEM; |
3be5a52b MS |
1703 | |
1704 | set_page_writeback(page); | |
1705 | ||
4250c066 | 1706 | req = fuse_request_alloc_nofs(1); |
3be5a52b MS |
1707 | if (!req) |
1708 | goto err; | |
1709 | ||
825d6d33 MS |
1710 | /* writeback always goes to bg_queue */ |
1711 | __set_bit(FR_BACKGROUND, &req->flags); | |
3be5a52b MS |
1712 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); |
1713 | if (!tmp_page) | |
1714 | goto err_free; | |
1715 | ||
72523425 | 1716 | error = -EIO; |
26d614df | 1717 | req->ff = fuse_write_file_get(fc, fi); |
72523425 | 1718 | if (!req->ff) |
27f1b363 | 1719 | goto err_nofile; |
72523425 | 1720 | |
adcadfa8 | 1721 | fuse_write_fill(req, req->ff, page_offset(page), 0); |
3be5a52b MS |
1722 | |
1723 | copy_highpage(tmp_page, page); | |
2d698b07 | 1724 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; |
8b284dc4 | 1725 | req->misc.write.next = NULL; |
f4975c67 | 1726 | req->in.argpages = 1; |
3be5a52b MS |
1727 | req->num_pages = 1; |
1728 | req->pages[0] = tmp_page; | |
b2430d75 | 1729 | req->page_descs[0].offset = 0; |
85f40aec | 1730 | req->page_descs[0].length = PAGE_SIZE; |
3be5a52b MS |
1731 | req->end = fuse_writepage_end; |
1732 | req->inode = inode; | |
1733 | ||
93f78d88 | 1734 | inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); |
11fb9989 | 1735 | inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP); |
3be5a52b | 1736 | |
f15ecfef | 1737 | spin_lock(&fi->lock); |
3be5a52b MS |
1738 | list_add(&req->writepages_entry, &fi->writepages); |
1739 | list_add_tail(&req->list, &fi->queued_writes); | |
1740 | fuse_flush_writepages(inode); | |
f15ecfef | 1741 | spin_unlock(&fi->lock); |
3be5a52b | 1742 | |
4a4ac4eb MP |
1743 | end_page_writeback(page); |
1744 | ||
3be5a52b MS |
1745 | return 0; |
1746 | ||
27f1b363 MP |
1747 | err_nofile: |
1748 | __free_page(tmp_page); | |
3be5a52b MS |
1749 | err_free: |
1750 | fuse_request_free(req); | |
1751 | err: | |
9183976e | 1752 | mapping_set_error(page->mapping, error); |
3be5a52b | 1753 | end_page_writeback(page); |
72523425 | 1754 | return error; |
3be5a52b MS |
1755 | } |
1756 | ||
1757 | static int fuse_writepage(struct page *page, struct writeback_control *wbc) | |
1758 | { | |
1759 | int err; | |
1760 | ||
ff17be08 MS |
1761 | if (fuse_page_is_writeback(page->mapping->host, page->index)) { |
1762 | /* | |
1763 | * ->writepages() should be called for sync() and friends. We | |
1764 | * should only get here on direct reclaim and then we are | |
1765 | * allowed to skip a page which is already in flight | |
1766 | */ | |
1767 | WARN_ON(wbc->sync_mode == WB_SYNC_ALL); | |
1768 | ||
1769 | redirty_page_for_writepage(wbc, page); | |
1770 | return 0; | |
1771 | } | |
1772 | ||
3be5a52b MS |
1773 | err = fuse_writepage_locked(page); |
1774 | unlock_page(page); | |
1775 | ||
1776 | return err; | |
1777 | } | |
1778 | ||
26d614df PE |
1779 | struct fuse_fill_wb_data { |
1780 | struct fuse_req *req; | |
1781 | struct fuse_file *ff; | |
1782 | struct inode *inode; | |
2d033eaa | 1783 | struct page **orig_pages; |
26d614df PE |
1784 | }; |
1785 | ||
1786 | static void fuse_writepages_send(struct fuse_fill_wb_data *data) | |
1787 | { | |
1788 | struct fuse_req *req = data->req; | |
1789 | struct inode *inode = data->inode; | |
26d614df | 1790 | struct fuse_inode *fi = get_fuse_inode(inode); |
2d033eaa MP |
1791 | int num_pages = req->num_pages; |
1792 | int i; | |
26d614df PE |
1793 | |
1794 | req->ff = fuse_file_get(data->ff); | |
f15ecfef | 1795 | spin_lock(&fi->lock); |
26d614df PE |
1796 | list_add_tail(&req->list, &fi->queued_writes); |
1797 | fuse_flush_writepages(inode); | |
f15ecfef | 1798 | spin_unlock(&fi->lock); |
2d033eaa MP |
1799 | |
1800 | for (i = 0; i < num_pages; i++) | |
1801 | end_page_writeback(data->orig_pages[i]); | |
26d614df PE |
1802 | } |
1803 | ||
7f305ca1 MS |
1804 | /* |
1805 | * First recheck under fi->lock if the offending offset is still under | |
419234d5 MS |
1806 | * writeback. If yes, then iterate auxiliary write requests, to see if there's |
1807 | * one already added for a page at this offset. If there's none, then insert | |
1808 | * this new request onto the auxiliary list, otherwise reuse the existing one by | |
7f305ca1 MS |
1809 | * copying the new page contents over to the old temporary page. |
1810 | */ | |
8b284dc4 MS |
1811 | static bool fuse_writepage_in_flight(struct fuse_req *new_req, |
1812 | struct page *page) | |
1813 | { | |
1814 | struct fuse_conn *fc = get_fuse_conn(new_req->inode); | |
1815 | struct fuse_inode *fi = get_fuse_inode(new_req->inode); | |
1816 | struct fuse_req *tmp; | |
1817 | struct fuse_req *old_req; | |
8b284dc4 | 1818 | |
7f305ca1 | 1819 | WARN_ON(new_req->num_pages != 0); |
8b284dc4 | 1820 | |
f15ecfef | 1821 | spin_lock(&fi->lock); |
8b284dc4 | 1822 | list_del(&new_req->writepages_entry); |
2fe93bd4 MS |
1823 | old_req = fuse_find_writeback(fi, page->index, page->index); |
1824 | if (!old_req) { | |
f6011081 | 1825 | list_add(&new_req->writepages_entry, &fi->writepages); |
f15ecfef | 1826 | spin_unlock(&fi->lock); |
2fe93bd4 | 1827 | return false; |
f6011081 | 1828 | } |
8b284dc4 | 1829 | |
f6011081 | 1830 | new_req->num_pages = 1; |
419234d5 | 1831 | for (tmp = old_req->misc.write.next; tmp; tmp = tmp->misc.write.next) { |
7f305ca1 MS |
1832 | pgoff_t curr_index; |
1833 | ||
1834 | WARN_ON(tmp->inode != new_req->inode); | |
09cbfeaf | 1835 | curr_index = tmp->misc.write.in.offset >> PAGE_SHIFT; |
419234d5 MS |
1836 | if (curr_index == page->index) { |
1837 | WARN_ON(tmp->num_pages != 1); | |
1838 | WARN_ON(!test_bit(FR_PENDING, &tmp->flags)); | |
c5de16cc | 1839 | swap(tmp->pages[0], new_req->pages[0]); |
7f305ca1 | 1840 | break; |
8b284dc4 MS |
1841 | } |
1842 | } | |
1843 | ||
7f305ca1 MS |
1844 | if (!tmp) { |
1845 | new_req->misc.write.next = old_req->misc.write.next; | |
1846 | old_req->misc.write.next = new_req; | |
1847 | } | |
41b6e41f | 1848 | |
f15ecfef | 1849 | spin_unlock(&fi->lock); |
7f305ca1 MS |
1850 | |
1851 | if (tmp) { | |
1852 | struct backing_dev_info *bdi = inode_to_bdi(new_req->inode); | |
8b284dc4 | 1853 | |
93f78d88 | 1854 | dec_wb_stat(&bdi->wb, WB_WRITEBACK); |
a2ebba82 | 1855 | dec_node_page_state(new_req->pages[0], NR_WRITEBACK_TEMP); |
93f78d88 | 1856 | wb_writeout_inc(&bdi->wb); |
8b284dc4 MS |
1857 | fuse_writepage_free(fc, new_req); |
1858 | fuse_request_free(new_req); | |
8b284dc4 | 1859 | } |
7f305ca1 | 1860 | |
2fe93bd4 | 1861 | return true; |
8b284dc4 MS |
1862 | } |
1863 | ||
26d614df PE |
1864 | static int fuse_writepages_fill(struct page *page, |
1865 | struct writeback_control *wbc, void *_data) | |
1866 | { | |
1867 | struct fuse_fill_wb_data *data = _data; | |
1868 | struct fuse_req *req = data->req; | |
1869 | struct inode *inode = data->inode; | |
f15ecfef | 1870 | struct fuse_inode *fi = get_fuse_inode(inode); |
26d614df PE |
1871 | struct fuse_conn *fc = get_fuse_conn(inode); |
1872 | struct page *tmp_page; | |
8b284dc4 | 1873 | bool is_writeback; |
26d614df PE |
1874 | int err; |
1875 | ||
1876 | if (!data->ff) { | |
1877 | err = -EIO; | |
1878 | data->ff = fuse_write_file_get(fc, get_fuse_inode(inode)); | |
1879 | if (!data->ff) | |
1880 | goto out_unlock; | |
1881 | } | |
1882 | ||
8b284dc4 MS |
1883 | /* |
1884 | * Being under writeback is unlikely but possible. For example direct | |
1885 | * read to an mmaped fuse file will set the page dirty twice; once when | |
1886 | * the pages are faulted with get_user_pages(), and then after the read | |
1887 | * completed. | |
1888 | */ | |
1889 | is_writeback = fuse_page_is_writeback(inode, page->index); | |
1890 | ||
1891 | if (req && req->num_pages && | |
5da784cc | 1892 | (is_writeback || req->num_pages == fc->max_pages || |
09cbfeaf | 1893 | (req->num_pages + 1) * PAGE_SIZE > fc->max_write || |
8b284dc4 MS |
1894 | data->orig_pages[req->num_pages - 1]->index + 1 != page->index)) { |
1895 | fuse_writepages_send(data); | |
1896 | data->req = NULL; | |
e52a8250 MS |
1897 | } else if (req && req->num_pages == req->max_pages) { |
1898 | if (!fuse_req_realloc_pages(fc, req, GFP_NOFS)) { | |
1899 | fuse_writepages_send(data); | |
1900 | req = data->req = NULL; | |
1901 | } | |
26d614df | 1902 | } |
e52a8250 | 1903 | |
26d614df PE |
1904 | err = -ENOMEM; |
1905 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1906 | if (!tmp_page) | |
1907 | goto out_unlock; | |
1908 | ||
1909 | /* | |
1910 | * The page must not be redirtied until the writeout is completed | |
1911 | * (i.e. userspace has sent a reply to the write request). Otherwise | |
1912 | * there could be more than one temporary page instance for each real | |
1913 | * page. | |
1914 | * | |
1915 | * This is ensured by holding the page lock in page_mkwrite() while | |
1916 | * checking fuse_page_is_writeback(). We already hold the page lock | |
1917 | * since clear_page_dirty_for_io() and keep it held until we add the | |
1918 | * request to the fi->writepages list and increment req->num_pages. | |
1919 | * After this fuse_page_is_writeback() will indicate that the page is | |
1920 | * under writeback, so we can release the page lock. | |
1921 | */ | |
1922 | if (data->req == NULL) { | |
1923 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1924 | ||
1925 | err = -ENOMEM; | |
e52a8250 | 1926 | req = fuse_request_alloc_nofs(FUSE_REQ_INLINE_PAGES); |
26d614df PE |
1927 | if (!req) { |
1928 | __free_page(tmp_page); | |
1929 | goto out_unlock; | |
1930 | } | |
1931 | ||
1932 | fuse_write_fill(req, data->ff, page_offset(page), 0); | |
1933 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; | |
8b284dc4 | 1934 | req->misc.write.next = NULL; |
26d614df | 1935 | req->in.argpages = 1; |
825d6d33 | 1936 | __set_bit(FR_BACKGROUND, &req->flags); |
26d614df PE |
1937 | req->num_pages = 0; |
1938 | req->end = fuse_writepage_end; | |
1939 | req->inode = inode; | |
1940 | ||
f15ecfef | 1941 | spin_lock(&fi->lock); |
26d614df | 1942 | list_add(&req->writepages_entry, &fi->writepages); |
f15ecfef | 1943 | spin_unlock(&fi->lock); |
26d614df PE |
1944 | |
1945 | data->req = req; | |
1946 | } | |
1947 | set_page_writeback(page); | |
1948 | ||
1949 | copy_highpage(tmp_page, page); | |
1950 | req->pages[req->num_pages] = tmp_page; | |
1951 | req->page_descs[req->num_pages].offset = 0; | |
1952 | req->page_descs[req->num_pages].length = PAGE_SIZE; | |
1953 | ||
93f78d88 | 1954 | inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); |
11fb9989 | 1955 | inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP); |
8b284dc4 MS |
1956 | |
1957 | err = 0; | |
1958 | if (is_writeback && fuse_writepage_in_flight(req, page)) { | |
1959 | end_page_writeback(page); | |
1960 | data->req = NULL; | |
1961 | goto out_unlock; | |
1962 | } | |
2d033eaa | 1963 | data->orig_pages[req->num_pages] = page; |
26d614df PE |
1964 | |
1965 | /* | |
f15ecfef | 1966 | * Protected by fi->lock against concurrent access by |
26d614df PE |
1967 | * fuse_page_is_writeback(). |
1968 | */ | |
f15ecfef | 1969 | spin_lock(&fi->lock); |
26d614df | 1970 | req->num_pages++; |
f15ecfef | 1971 | spin_unlock(&fi->lock); |
26d614df | 1972 | |
26d614df PE |
1973 | out_unlock: |
1974 | unlock_page(page); | |
1975 | ||
1976 | return err; | |
1977 | } | |
1978 | ||
1979 | static int fuse_writepages(struct address_space *mapping, | |
1980 | struct writeback_control *wbc) | |
1981 | { | |
1982 | struct inode *inode = mapping->host; | |
5da784cc | 1983 | struct fuse_conn *fc = get_fuse_conn(inode); |
26d614df PE |
1984 | struct fuse_fill_wb_data data; |
1985 | int err; | |
1986 | ||
1987 | err = -EIO; | |
1988 | if (is_bad_inode(inode)) | |
1989 | goto out; | |
1990 | ||
1991 | data.inode = inode; | |
1992 | data.req = NULL; | |
1993 | data.ff = NULL; | |
1994 | ||
2d033eaa | 1995 | err = -ENOMEM; |
5da784cc | 1996 | data.orig_pages = kcalloc(fc->max_pages, |
f2b3455e | 1997 | sizeof(struct page *), |
2d033eaa MP |
1998 | GFP_NOFS); |
1999 | if (!data.orig_pages) | |
2000 | goto out; | |
2001 | ||
26d614df PE |
2002 | err = write_cache_pages(mapping, wbc, fuse_writepages_fill, &data); |
2003 | if (data.req) { | |
2004 | /* Ignore errors if we can write at least one page */ | |
2005 | BUG_ON(!data.req->num_pages); | |
2006 | fuse_writepages_send(&data); | |
2007 | err = 0; | |
2008 | } | |
2009 | if (data.ff) | |
2e64ff15 | 2010 | fuse_file_put(data.ff, false, false); |
2d033eaa MP |
2011 | |
2012 | kfree(data.orig_pages); | |
26d614df PE |
2013 | out: |
2014 | return err; | |
2015 | } | |
2016 | ||
6b12c1b3 PE |
2017 | /* |
2018 | * It's worthy to make sure that space is reserved on disk for the write, | |
2019 | * but how to implement it without killing performance need more thinking. | |
2020 | */ | |
2021 | static int fuse_write_begin(struct file *file, struct address_space *mapping, | |
2022 | loff_t pos, unsigned len, unsigned flags, | |
2023 | struct page **pagep, void **fsdata) | |
2024 | { | |
09cbfeaf | 2025 | pgoff_t index = pos >> PAGE_SHIFT; |
a455589f | 2026 | struct fuse_conn *fc = get_fuse_conn(file_inode(file)); |
6b12c1b3 PE |
2027 | struct page *page; |
2028 | loff_t fsize; | |
2029 | int err = -ENOMEM; | |
2030 | ||
2031 | WARN_ON(!fc->writeback_cache); | |
2032 | ||
2033 | page = grab_cache_page_write_begin(mapping, index, flags); | |
2034 | if (!page) | |
2035 | goto error; | |
2036 | ||
2037 | fuse_wait_on_page_writeback(mapping->host, page->index); | |
2038 | ||
09cbfeaf | 2039 | if (PageUptodate(page) || len == PAGE_SIZE) |
6b12c1b3 PE |
2040 | goto success; |
2041 | /* | |
2042 | * Check if the start this page comes after the end of file, in which | |
2043 | * case the readpage can be optimized away. | |
2044 | */ | |
2045 | fsize = i_size_read(mapping->host); | |
09cbfeaf KS |
2046 | if (fsize <= (pos & PAGE_MASK)) { |
2047 | size_t off = pos & ~PAGE_MASK; | |
6b12c1b3 PE |
2048 | if (off) |
2049 | zero_user_segment(page, 0, off); | |
2050 | goto success; | |
2051 | } | |
2052 | err = fuse_do_readpage(file, page); | |
2053 | if (err) | |
2054 | goto cleanup; | |
2055 | success: | |
2056 | *pagep = page; | |
2057 | return 0; | |
2058 | ||
2059 | cleanup: | |
2060 | unlock_page(page); | |
09cbfeaf | 2061 | put_page(page); |
6b12c1b3 PE |
2062 | error: |
2063 | return err; | |
2064 | } | |
2065 | ||
2066 | static int fuse_write_end(struct file *file, struct address_space *mapping, | |
2067 | loff_t pos, unsigned len, unsigned copied, | |
2068 | struct page *page, void *fsdata) | |
2069 | { | |
2070 | struct inode *inode = page->mapping->host; | |
2071 | ||
59c3b76c MS |
2072 | /* Haven't copied anything? Skip zeroing, size extending, dirtying. */ |
2073 | if (!copied) | |
2074 | goto unlock; | |
2075 | ||
6b12c1b3 PE |
2076 | if (!PageUptodate(page)) { |
2077 | /* Zero any unwritten bytes at the end of the page */ | |
09cbfeaf | 2078 | size_t endoff = (pos + copied) & ~PAGE_MASK; |
6b12c1b3 | 2079 | if (endoff) |
09cbfeaf | 2080 | zero_user_segment(page, endoff, PAGE_SIZE); |
6b12c1b3 PE |
2081 | SetPageUptodate(page); |
2082 | } | |
2083 | ||
2084 | fuse_write_update_size(inode, pos + copied); | |
2085 | set_page_dirty(page); | |
59c3b76c MS |
2086 | |
2087 | unlock: | |
6b12c1b3 | 2088 | unlock_page(page); |
09cbfeaf | 2089 | put_page(page); |
6b12c1b3 PE |
2090 | |
2091 | return copied; | |
2092 | } | |
2093 | ||
3be5a52b MS |
2094 | static int fuse_launder_page(struct page *page) |
2095 | { | |
2096 | int err = 0; | |
2097 | if (clear_page_dirty_for_io(page)) { | |
2098 | struct inode *inode = page->mapping->host; | |
2099 | err = fuse_writepage_locked(page); | |
2100 | if (!err) | |
2101 | fuse_wait_on_page_writeback(inode, page->index); | |
2102 | } | |
2103 | return err; | |
2104 | } | |
2105 | ||
2106 | /* | |
2107 | * Write back dirty pages now, because there may not be any suitable | |
2108 | * open files later | |
2109 | */ | |
2110 | static void fuse_vma_close(struct vm_area_struct *vma) | |
2111 | { | |
2112 | filemap_write_and_wait(vma->vm_file->f_mapping); | |
2113 | } | |
2114 | ||
2115 | /* | |
2116 | * Wait for writeback against this page to complete before allowing it | |
2117 | * to be marked dirty again, and hence written back again, possibly | |
2118 | * before the previous writepage completed. | |
2119 | * | |
2120 | * Block here, instead of in ->writepage(), so that the userspace fs | |
2121 | * can only block processes actually operating on the filesystem. | |
2122 | * | |
2123 | * Otherwise unprivileged userspace fs would be able to block | |
2124 | * unrelated: | |
2125 | * | |
2126 | * - page migration | |
2127 | * - sync(2) | |
2128 | * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER | |
2129 | */ | |
46fb504a | 2130 | static vm_fault_t fuse_page_mkwrite(struct vm_fault *vmf) |
3be5a52b | 2131 | { |
c2ec175c | 2132 | struct page *page = vmf->page; |
11bac800 | 2133 | struct inode *inode = file_inode(vmf->vma->vm_file); |
cca24370 | 2134 | |
11bac800 | 2135 | file_update_time(vmf->vma->vm_file); |
cca24370 MS |
2136 | lock_page(page); |
2137 | if (page->mapping != inode->i_mapping) { | |
2138 | unlock_page(page); | |
2139 | return VM_FAULT_NOPAGE; | |
2140 | } | |
3be5a52b MS |
2141 | |
2142 | fuse_wait_on_page_writeback(inode, page->index); | |
cca24370 | 2143 | return VM_FAULT_LOCKED; |
3be5a52b MS |
2144 | } |
2145 | ||
f0f37e2f | 2146 | static const struct vm_operations_struct fuse_file_vm_ops = { |
3be5a52b MS |
2147 | .close = fuse_vma_close, |
2148 | .fault = filemap_fault, | |
f1820361 | 2149 | .map_pages = filemap_map_pages, |
3be5a52b MS |
2150 | .page_mkwrite = fuse_page_mkwrite, |
2151 | }; | |
2152 | ||
2153 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) | |
2154 | { | |
55752a3a MS |
2155 | struct fuse_file *ff = file->private_data; |
2156 | ||
2157 | if (ff->open_flags & FOPEN_DIRECT_IO) { | |
2158 | /* Can't provide the coherency needed for MAP_SHARED */ | |
2159 | if (vma->vm_flags & VM_MAYSHARE) | |
2160 | return -ENODEV; | |
2161 | ||
2162 | invalidate_inode_pages2(file->f_mapping); | |
2163 | ||
2164 | return generic_file_mmap(file, vma); | |
2165 | } | |
2166 | ||
650b22b9 PE |
2167 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) |
2168 | fuse_link_write_file(file); | |
2169 | ||
3be5a52b MS |
2170 | file_accessed(file); |
2171 | vma->vm_ops = &fuse_file_vm_ops; | |
b6aeaded MS |
2172 | return 0; |
2173 | } | |
2174 | ||
0b6e9ea0 SF |
2175 | static int convert_fuse_file_lock(struct fuse_conn *fc, |
2176 | const struct fuse_file_lock *ffl, | |
71421259 MS |
2177 | struct file_lock *fl) |
2178 | { | |
2179 | switch (ffl->type) { | |
2180 | case F_UNLCK: | |
2181 | break; | |
2182 | ||
2183 | case F_RDLCK: | |
2184 | case F_WRLCK: | |
2185 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
2186 | ffl->end < ffl->start) | |
2187 | return -EIO; | |
2188 | ||
2189 | fl->fl_start = ffl->start; | |
2190 | fl->fl_end = ffl->end; | |
0b6e9ea0 SF |
2191 | |
2192 | /* | |
9d5b86ac BC |
2193 | * Convert pid into init's pid namespace. The locks API will |
2194 | * translate it into the caller's pid namespace. | |
0b6e9ea0 SF |
2195 | */ |
2196 | rcu_read_lock(); | |
9d5b86ac | 2197 | fl->fl_pid = pid_nr_ns(find_pid_ns(ffl->pid, fc->pid_ns), &init_pid_ns); |
0b6e9ea0 | 2198 | rcu_read_unlock(); |
71421259 MS |
2199 | break; |
2200 | ||
2201 | default: | |
2202 | return -EIO; | |
2203 | } | |
2204 | fl->fl_type = ffl->type; | |
2205 | return 0; | |
2206 | } | |
2207 | ||
7078187a | 2208 | static void fuse_lk_fill(struct fuse_args *args, struct file *file, |
a9ff4f87 | 2209 | const struct file_lock *fl, int opcode, pid_t pid, |
7078187a | 2210 | int flock, struct fuse_lk_in *inarg) |
71421259 | 2211 | { |
6131ffaa | 2212 | struct inode *inode = file_inode(file); |
9c8ef561 | 2213 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 | 2214 | struct fuse_file *ff = file->private_data; |
7078187a MS |
2215 | |
2216 | memset(inarg, 0, sizeof(*inarg)); | |
2217 | inarg->fh = ff->fh; | |
2218 | inarg->owner = fuse_lock_owner_id(fc, fl->fl_owner); | |
2219 | inarg->lk.start = fl->fl_start; | |
2220 | inarg->lk.end = fl->fl_end; | |
2221 | inarg->lk.type = fl->fl_type; | |
2222 | inarg->lk.pid = pid; | |
a9ff4f87 | 2223 | if (flock) |
7078187a MS |
2224 | inarg->lk_flags |= FUSE_LK_FLOCK; |
2225 | args->in.h.opcode = opcode; | |
2226 | args->in.h.nodeid = get_node_id(inode); | |
2227 | args->in.numargs = 1; | |
2228 | args->in.args[0].size = sizeof(*inarg); | |
2229 | args->in.args[0].value = inarg; | |
71421259 MS |
2230 | } |
2231 | ||
2232 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
2233 | { | |
6131ffaa | 2234 | struct inode *inode = file_inode(file); |
71421259 | 2235 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a MS |
2236 | FUSE_ARGS(args); |
2237 | struct fuse_lk_in inarg; | |
71421259 MS |
2238 | struct fuse_lk_out outarg; |
2239 | int err; | |
2240 | ||
7078187a MS |
2241 | fuse_lk_fill(&args, file, fl, FUSE_GETLK, 0, 0, &inarg); |
2242 | args.out.numargs = 1; | |
2243 | args.out.args[0].size = sizeof(outarg); | |
2244 | args.out.args[0].value = &outarg; | |
2245 | err = fuse_simple_request(fc, &args); | |
71421259 | 2246 | if (!err) |
0b6e9ea0 | 2247 | err = convert_fuse_file_lock(fc, &outarg.lk, fl); |
71421259 MS |
2248 | |
2249 | return err; | |
2250 | } | |
2251 | ||
a9ff4f87 | 2252 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 2253 | { |
6131ffaa | 2254 | struct inode *inode = file_inode(file); |
71421259 | 2255 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a MS |
2256 | FUSE_ARGS(args); |
2257 | struct fuse_lk_in inarg; | |
71421259 | 2258 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; |
0b6e9ea0 SF |
2259 | struct pid *pid = fl->fl_type != F_UNLCK ? task_tgid(current) : NULL; |
2260 | pid_t pid_nr = pid_nr_ns(pid, fc->pid_ns); | |
71421259 MS |
2261 | int err; |
2262 | ||
8fb47a4f | 2263 | if (fl->fl_lmops && fl->fl_lmops->lm_grant) { |
48e90761 MS |
2264 | /* NLM needs asynchronous locks, which we don't support yet */ |
2265 | return -ENOLCK; | |
2266 | } | |
2267 | ||
71421259 | 2268 | /* Unlock on close is handled by the flush method */ |
50f2112c | 2269 | if ((fl->fl_flags & FL_CLOSE_POSIX) == FL_CLOSE_POSIX) |
71421259 MS |
2270 | return 0; |
2271 | ||
0b6e9ea0 | 2272 | fuse_lk_fill(&args, file, fl, opcode, pid_nr, flock, &inarg); |
7078187a | 2273 | err = fuse_simple_request(fc, &args); |
71421259 | 2274 | |
a4d27e75 MS |
2275 | /* locking is restartable */ |
2276 | if (err == -EINTR) | |
2277 | err = -ERESTARTSYS; | |
7078187a | 2278 | |
71421259 MS |
2279 | return err; |
2280 | } | |
2281 | ||
2282 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
2283 | { | |
6131ffaa | 2284 | struct inode *inode = file_inode(file); |
71421259 MS |
2285 | struct fuse_conn *fc = get_fuse_conn(inode); |
2286 | int err; | |
2287 | ||
48e90761 MS |
2288 | if (cmd == F_CANCELLK) { |
2289 | err = 0; | |
2290 | } else if (cmd == F_GETLK) { | |
71421259 | 2291 | if (fc->no_lock) { |
9d6a8c5c | 2292 | posix_test_lock(file, fl); |
71421259 MS |
2293 | err = 0; |
2294 | } else | |
2295 | err = fuse_getlk(file, fl); | |
2296 | } else { | |
2297 | if (fc->no_lock) | |
48e90761 | 2298 | err = posix_lock_file(file, fl, NULL); |
71421259 | 2299 | else |
a9ff4f87 | 2300 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
2301 | } |
2302 | return err; | |
2303 | } | |
2304 | ||
a9ff4f87 MS |
2305 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
2306 | { | |
6131ffaa | 2307 | struct inode *inode = file_inode(file); |
a9ff4f87 MS |
2308 | struct fuse_conn *fc = get_fuse_conn(inode); |
2309 | int err; | |
2310 | ||
37fb3a30 | 2311 | if (fc->no_flock) { |
4f656367 | 2312 | err = locks_lock_file_wait(file, fl); |
a9ff4f87 | 2313 | } else { |
37fb3a30 MS |
2314 | struct fuse_file *ff = file->private_data; |
2315 | ||
a9ff4f87 | 2316 | /* emulate flock with POSIX locks */ |
37fb3a30 | 2317 | ff->flock = true; |
a9ff4f87 MS |
2318 | err = fuse_setlk(file, fl, 1); |
2319 | } | |
2320 | ||
2321 | return err; | |
2322 | } | |
2323 | ||
b2d2272f MS |
2324 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
2325 | { | |
2326 | struct inode *inode = mapping->host; | |
2327 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 2328 | FUSE_ARGS(args); |
b2d2272f MS |
2329 | struct fuse_bmap_in inarg; |
2330 | struct fuse_bmap_out outarg; | |
2331 | int err; | |
2332 | ||
2333 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
2334 | return 0; | |
2335 | ||
b2d2272f MS |
2336 | memset(&inarg, 0, sizeof(inarg)); |
2337 | inarg.block = block; | |
2338 | inarg.blocksize = inode->i_sb->s_blocksize; | |
7078187a MS |
2339 | args.in.h.opcode = FUSE_BMAP; |
2340 | args.in.h.nodeid = get_node_id(inode); | |
2341 | args.in.numargs = 1; | |
2342 | args.in.args[0].size = sizeof(inarg); | |
2343 | args.in.args[0].value = &inarg; | |
2344 | args.out.numargs = 1; | |
2345 | args.out.args[0].size = sizeof(outarg); | |
2346 | args.out.args[0].value = &outarg; | |
2347 | err = fuse_simple_request(fc, &args); | |
b2d2272f MS |
2348 | if (err == -ENOSYS) |
2349 | fc->no_bmap = 1; | |
2350 | ||
2351 | return err ? 0 : outarg.block; | |
2352 | } | |
2353 | ||
0b5da8db R |
2354 | static loff_t fuse_lseek(struct file *file, loff_t offset, int whence) |
2355 | { | |
2356 | struct inode *inode = file->f_mapping->host; | |
2357 | struct fuse_conn *fc = get_fuse_conn(inode); | |
2358 | struct fuse_file *ff = file->private_data; | |
2359 | FUSE_ARGS(args); | |
2360 | struct fuse_lseek_in inarg = { | |
2361 | .fh = ff->fh, | |
2362 | .offset = offset, | |
2363 | .whence = whence | |
2364 | }; | |
2365 | struct fuse_lseek_out outarg; | |
2366 | int err; | |
2367 | ||
2368 | if (fc->no_lseek) | |
2369 | goto fallback; | |
2370 | ||
2371 | args.in.h.opcode = FUSE_LSEEK; | |
2372 | args.in.h.nodeid = ff->nodeid; | |
2373 | args.in.numargs = 1; | |
2374 | args.in.args[0].size = sizeof(inarg); | |
2375 | args.in.args[0].value = &inarg; | |
2376 | args.out.numargs = 1; | |
2377 | args.out.args[0].size = sizeof(outarg); | |
2378 | args.out.args[0].value = &outarg; | |
2379 | err = fuse_simple_request(fc, &args); | |
2380 | if (err) { | |
2381 | if (err == -ENOSYS) { | |
2382 | fc->no_lseek = 1; | |
2383 | goto fallback; | |
2384 | } | |
2385 | return err; | |
2386 | } | |
2387 | ||
2388 | return vfs_setpos(file, outarg.offset, inode->i_sb->s_maxbytes); | |
2389 | ||
2390 | fallback: | |
5b97eeac | 2391 | err = fuse_update_attributes(inode, file); |
0b5da8db R |
2392 | if (!err) |
2393 | return generic_file_llseek(file, offset, whence); | |
2394 | else | |
2395 | return err; | |
2396 | } | |
2397 | ||
965c8e59 | 2398 | static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence) |
5559b8f4 MS |
2399 | { |
2400 | loff_t retval; | |
6131ffaa | 2401 | struct inode *inode = file_inode(file); |
5559b8f4 | 2402 | |
0b5da8db R |
2403 | switch (whence) { |
2404 | case SEEK_SET: | |
2405 | case SEEK_CUR: | |
2406 | /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */ | |
965c8e59 | 2407 | retval = generic_file_llseek(file, offset, whence); |
0b5da8db R |
2408 | break; |
2409 | case SEEK_END: | |
5955102c | 2410 | inode_lock(inode); |
5b97eeac | 2411 | retval = fuse_update_attributes(inode, file); |
0b5da8db R |
2412 | if (!retval) |
2413 | retval = generic_file_llseek(file, offset, whence); | |
5955102c | 2414 | inode_unlock(inode); |
0b5da8db R |
2415 | break; |
2416 | case SEEK_HOLE: | |
2417 | case SEEK_DATA: | |
5955102c | 2418 | inode_lock(inode); |
0b5da8db | 2419 | retval = fuse_lseek(file, offset, whence); |
5955102c | 2420 | inode_unlock(inode); |
0b5da8db R |
2421 | break; |
2422 | default: | |
2423 | retval = -EINVAL; | |
2424 | } | |
c07c3d19 | 2425 | |
5559b8f4 MS |
2426 | return retval; |
2427 | } | |
2428 | ||
d9d318d3 MS |
2429 | /* |
2430 | * CUSE servers compiled on 32bit broke on 64bit kernels because the | |
2431 | * ABI was defined to be 'struct iovec' which is different on 32bit | |
2432 | * and 64bit. Fortunately we can determine which structure the server | |
2433 | * used from the size of the reply. | |
2434 | */ | |
1baa26b2 MS |
2435 | static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, |
2436 | size_t transferred, unsigned count, | |
2437 | bool is_compat) | |
d9d318d3 MS |
2438 | { |
2439 | #ifdef CONFIG_COMPAT | |
2440 | if (count * sizeof(struct compat_iovec) == transferred) { | |
2441 | struct compat_iovec *ciov = src; | |
2442 | unsigned i; | |
2443 | ||
2444 | /* | |
2445 | * With this interface a 32bit server cannot support | |
2446 | * non-compat (i.e. ones coming from 64bit apps) ioctl | |
2447 | * requests | |
2448 | */ | |
2449 | if (!is_compat) | |
2450 | return -EINVAL; | |
2451 | ||
2452 | for (i = 0; i < count; i++) { | |
2453 | dst[i].iov_base = compat_ptr(ciov[i].iov_base); | |
2454 | dst[i].iov_len = ciov[i].iov_len; | |
2455 | } | |
2456 | return 0; | |
2457 | } | |
2458 | #endif | |
2459 | ||
2460 | if (count * sizeof(struct iovec) != transferred) | |
2461 | return -EIO; | |
2462 | ||
2463 | memcpy(dst, src, transferred); | |
2464 | return 0; | |
2465 | } | |
2466 | ||
7572777e | 2467 | /* Make sure iov_length() won't overflow */ |
5da784cc CS |
2468 | static int fuse_verify_ioctl_iov(struct fuse_conn *fc, struct iovec *iov, |
2469 | size_t count) | |
7572777e MS |
2470 | { |
2471 | size_t n; | |
5da784cc | 2472 | u32 max = fc->max_pages << PAGE_SHIFT; |
7572777e | 2473 | |
fb6ccff6 | 2474 | for (n = 0; n < count; n++, iov++) { |
7572777e MS |
2475 | if (iov->iov_len > (size_t) max) |
2476 | return -ENOMEM; | |
2477 | max -= iov->iov_len; | |
2478 | } | |
2479 | return 0; | |
2480 | } | |
2481 | ||
1baa26b2 MS |
2482 | static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, |
2483 | void *src, size_t transferred, unsigned count, | |
2484 | bool is_compat) | |
2485 | { | |
2486 | unsigned i; | |
2487 | struct fuse_ioctl_iovec *fiov = src; | |
2488 | ||
2489 | if (fc->minor < 16) { | |
2490 | return fuse_copy_ioctl_iovec_old(dst, src, transferred, | |
2491 | count, is_compat); | |
2492 | } | |
2493 | ||
2494 | if (count * sizeof(struct fuse_ioctl_iovec) != transferred) | |
2495 | return -EIO; | |
2496 | ||
2497 | for (i = 0; i < count; i++) { | |
2498 | /* Did the server supply an inappropriate value? */ | |
2499 | if (fiov[i].base != (unsigned long) fiov[i].base || | |
2500 | fiov[i].len != (unsigned long) fiov[i].len) | |
2501 | return -EIO; | |
2502 | ||
2503 | dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; | |
2504 | dst[i].iov_len = (size_t) fiov[i].len; | |
2505 | ||
2506 | #ifdef CONFIG_COMPAT | |
2507 | if (is_compat && | |
2508 | (ptr_to_compat(dst[i].iov_base) != fiov[i].base || | |
2509 | (compat_size_t) dst[i].iov_len != fiov[i].len)) | |
2510 | return -EIO; | |
2511 | #endif | |
2512 | } | |
2513 | ||
2514 | return 0; | |
2515 | } | |
2516 | ||
2517 | ||
59efec7b TH |
2518 | /* |
2519 | * For ioctls, there is no generic way to determine how much memory | |
2520 | * needs to be read and/or written. Furthermore, ioctls are allowed | |
2521 | * to dereference the passed pointer, so the parameter requires deep | |
2522 | * copying but FUSE has no idea whatsoever about what to copy in or | |
2523 | * out. | |
2524 | * | |
2525 | * This is solved by allowing FUSE server to retry ioctl with | |
2526 | * necessary in/out iovecs. Let's assume the ioctl implementation | |
2527 | * needs to read in the following structure. | |
2528 | * | |
2529 | * struct a { | |
2530 | * char *buf; | |
2531 | * size_t buflen; | |
2532 | * } | |
2533 | * | |
2534 | * On the first callout to FUSE server, inarg->in_size and | |
2535 | * inarg->out_size will be NULL; then, the server completes the ioctl | |
2536 | * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and | |
2537 | * the actual iov array to | |
2538 | * | |
2539 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } | |
2540 | * | |
2541 | * which tells FUSE to copy in the requested area and retry the ioctl. | |
2542 | * On the second round, the server has access to the structure and | |
2543 | * from that it can tell what to look for next, so on the invocation, | |
2544 | * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to | |
2545 | * | |
2546 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, | |
2547 | * { .iov_base = a.buf, .iov_len = a.buflen } } | |
2548 | * | |
2549 | * FUSE will copy both struct a and the pointed buffer from the | |
2550 | * process doing the ioctl and retry ioctl with both struct a and the | |
2551 | * buffer. | |
2552 | * | |
2553 | * This time, FUSE server has everything it needs and completes ioctl | |
2554 | * without FUSE_IOCTL_RETRY which finishes the ioctl call. | |
2555 | * | |
2556 | * Copying data out works the same way. | |
2557 | * | |
2558 | * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel | |
2559 | * automatically initializes in and out iovs by decoding @cmd with | |
2560 | * _IOC_* macros and the server is not allowed to request RETRY. This | |
2561 | * limits ioctl data transfers to well-formed ioctls and is the forced | |
2562 | * behavior for all FUSE servers. | |
2563 | */ | |
08cbf542 TH |
2564 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
2565 | unsigned int flags) | |
59efec7b | 2566 | { |
59efec7b | 2567 | struct fuse_file *ff = file->private_data; |
d36f2487 | 2568 | struct fuse_conn *fc = ff->fc; |
59efec7b TH |
2569 | struct fuse_ioctl_in inarg = { |
2570 | .fh = ff->fh, | |
2571 | .cmd = cmd, | |
2572 | .arg = arg, | |
2573 | .flags = flags | |
2574 | }; | |
2575 | struct fuse_ioctl_out outarg; | |
2576 | struct fuse_req *req = NULL; | |
2577 | struct page **pages = NULL; | |
8ac83505 | 2578 | struct iovec *iov_page = NULL; |
59efec7b TH |
2579 | struct iovec *in_iov = NULL, *out_iov = NULL; |
2580 | unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages; | |
acbe5fda MS |
2581 | size_t in_size, out_size, transferred, c; |
2582 | int err, i; | |
2583 | struct iov_iter ii; | |
59efec7b | 2584 | |
1baa26b2 MS |
2585 | #if BITS_PER_LONG == 32 |
2586 | inarg.flags |= FUSE_IOCTL_32BIT; | |
2587 | #else | |
6407f44a | 2588 | if (flags & FUSE_IOCTL_COMPAT) { |
1baa26b2 | 2589 | inarg.flags |= FUSE_IOCTL_32BIT; |
6407f44a IA |
2590 | #ifdef CONFIG_X86_X32 |
2591 | if (in_x32_syscall()) | |
2592 | inarg.flags |= FUSE_IOCTL_COMPAT_X32; | |
2593 | #endif | |
2594 | } | |
1baa26b2 MS |
2595 | #endif |
2596 | ||
59efec7b | 2597 | /* assume all the iovs returned by client always fits in a page */ |
1baa26b2 | 2598 | BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); |
59efec7b | 2599 | |
59efec7b | 2600 | err = -ENOMEM; |
5da784cc | 2601 | pages = kcalloc(fc->max_pages, sizeof(pages[0]), GFP_KERNEL); |
8ac83505 | 2602 | iov_page = (struct iovec *) __get_free_page(GFP_KERNEL); |
59efec7b TH |
2603 | if (!pages || !iov_page) |
2604 | goto out; | |
2605 | ||
2606 | /* | |
2607 | * If restricted, initialize IO parameters as encoded in @cmd. | |
2608 | * RETRY from server is not allowed. | |
2609 | */ | |
2610 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { | |
8ac83505 | 2611 | struct iovec *iov = iov_page; |
59efec7b | 2612 | |
c9f0523d | 2613 | iov->iov_base = (void __user *)arg; |
59efec7b TH |
2614 | iov->iov_len = _IOC_SIZE(cmd); |
2615 | ||
2616 | if (_IOC_DIR(cmd) & _IOC_WRITE) { | |
2617 | in_iov = iov; | |
2618 | in_iovs = 1; | |
2619 | } | |
2620 | ||
2621 | if (_IOC_DIR(cmd) & _IOC_READ) { | |
2622 | out_iov = iov; | |
2623 | out_iovs = 1; | |
2624 | } | |
2625 | } | |
2626 | ||
2627 | retry: | |
2628 | inarg.in_size = in_size = iov_length(in_iov, in_iovs); | |
2629 | inarg.out_size = out_size = iov_length(out_iov, out_iovs); | |
2630 | ||
2631 | /* | |
2632 | * Out data can be used either for actual out data or iovs, | |
2633 | * make sure there always is at least one page. | |
2634 | */ | |
2635 | out_size = max_t(size_t, out_size, PAGE_SIZE); | |
2636 | max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); | |
2637 | ||
2638 | /* make sure there are enough buffer pages and init request with them */ | |
2639 | err = -ENOMEM; | |
5da784cc | 2640 | if (max_pages > fc->max_pages) |
59efec7b TH |
2641 | goto out; |
2642 | while (num_pages < max_pages) { | |
2643 | pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); | |
2644 | if (!pages[num_pages]) | |
2645 | goto out; | |
2646 | num_pages++; | |
2647 | } | |
2648 | ||
54b96670 | 2649 | req = fuse_get_req(fc, num_pages); |
59efec7b TH |
2650 | if (IS_ERR(req)) { |
2651 | err = PTR_ERR(req); | |
2652 | req = NULL; | |
2653 | goto out; | |
2654 | } | |
2655 | memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages); | |
2656 | req->num_pages = num_pages; | |
7c190c8b | 2657 | fuse_page_descs_length_init(req, 0, req->num_pages); |
59efec7b TH |
2658 | |
2659 | /* okay, let's send it to the client */ | |
2660 | req->in.h.opcode = FUSE_IOCTL; | |
d36f2487 | 2661 | req->in.h.nodeid = ff->nodeid; |
59efec7b TH |
2662 | req->in.numargs = 1; |
2663 | req->in.args[0].size = sizeof(inarg); | |
2664 | req->in.args[0].value = &inarg; | |
2665 | if (in_size) { | |
2666 | req->in.numargs++; | |
2667 | req->in.args[1].size = in_size; | |
2668 | req->in.argpages = 1; | |
2669 | ||
acbe5fda MS |
2670 | err = -EFAULT; |
2671 | iov_iter_init(&ii, WRITE, in_iov, in_iovs, in_size); | |
2672 | for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= num_pages); i++) { | |
2673 | c = copy_page_from_iter(pages[i], 0, PAGE_SIZE, &ii); | |
2674 | if (c != PAGE_SIZE && iov_iter_count(&ii)) | |
2675 | goto out; | |
2676 | } | |
59efec7b TH |
2677 | } |
2678 | ||
2679 | req->out.numargs = 2; | |
2680 | req->out.args[0].size = sizeof(outarg); | |
2681 | req->out.args[0].value = &outarg; | |
2682 | req->out.args[1].size = out_size; | |
2683 | req->out.argpages = 1; | |
2684 | req->out.argvar = 1; | |
2685 | ||
b93f858a | 2686 | fuse_request_send(fc, req); |
59efec7b TH |
2687 | err = req->out.h.error; |
2688 | transferred = req->out.args[1].size; | |
2689 | fuse_put_request(fc, req); | |
2690 | req = NULL; | |
2691 | if (err) | |
2692 | goto out; | |
2693 | ||
2694 | /* did it ask for retry? */ | |
2695 | if (outarg.flags & FUSE_IOCTL_RETRY) { | |
8ac83505 | 2696 | void *vaddr; |
59efec7b TH |
2697 | |
2698 | /* no retry if in restricted mode */ | |
2699 | err = -EIO; | |
2700 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) | |
2701 | goto out; | |
2702 | ||
2703 | in_iovs = outarg.in_iovs; | |
2704 | out_iovs = outarg.out_iovs; | |
2705 | ||
2706 | /* | |
2707 | * Make sure things are in boundary, separate checks | |
2708 | * are to protect against overflow. | |
2709 | */ | |
2710 | err = -ENOMEM; | |
2711 | if (in_iovs > FUSE_IOCTL_MAX_IOV || | |
2712 | out_iovs > FUSE_IOCTL_MAX_IOV || | |
2713 | in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) | |
2714 | goto out; | |
2715 | ||
2408f6ef | 2716 | vaddr = kmap_atomic(pages[0]); |
1baa26b2 | 2717 | err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr, |
d9d318d3 MS |
2718 | transferred, in_iovs + out_iovs, |
2719 | (flags & FUSE_IOCTL_COMPAT) != 0); | |
2408f6ef | 2720 | kunmap_atomic(vaddr); |
d9d318d3 MS |
2721 | if (err) |
2722 | goto out; | |
59efec7b | 2723 | |
8ac83505 | 2724 | in_iov = iov_page; |
59efec7b TH |
2725 | out_iov = in_iov + in_iovs; |
2726 | ||
5da784cc | 2727 | err = fuse_verify_ioctl_iov(fc, in_iov, in_iovs); |
7572777e MS |
2728 | if (err) |
2729 | goto out; | |
2730 | ||
5da784cc | 2731 | err = fuse_verify_ioctl_iov(fc, out_iov, out_iovs); |
7572777e MS |
2732 | if (err) |
2733 | goto out; | |
2734 | ||
59efec7b TH |
2735 | goto retry; |
2736 | } | |
2737 | ||
2738 | err = -EIO; | |
2739 | if (transferred > inarg.out_size) | |
2740 | goto out; | |
2741 | ||
acbe5fda MS |
2742 | err = -EFAULT; |
2743 | iov_iter_init(&ii, READ, out_iov, out_iovs, transferred); | |
2744 | for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= num_pages); i++) { | |
2745 | c = copy_page_to_iter(pages[i], 0, PAGE_SIZE, &ii); | |
2746 | if (c != PAGE_SIZE && iov_iter_count(&ii)) | |
2747 | goto out; | |
2748 | } | |
2749 | err = 0; | |
59efec7b TH |
2750 | out: |
2751 | if (req) | |
2752 | fuse_put_request(fc, req); | |
8ac83505 | 2753 | free_page((unsigned long) iov_page); |
59efec7b TH |
2754 | while (num_pages) |
2755 | __free_page(pages[--num_pages]); | |
2756 | kfree(pages); | |
2757 | ||
2758 | return err ? err : outarg.result; | |
2759 | } | |
08cbf542 | 2760 | EXPORT_SYMBOL_GPL(fuse_do_ioctl); |
59efec7b | 2761 | |
b18da0c5 MS |
2762 | long fuse_ioctl_common(struct file *file, unsigned int cmd, |
2763 | unsigned long arg, unsigned int flags) | |
d36f2487 | 2764 | { |
6131ffaa | 2765 | struct inode *inode = file_inode(file); |
d36f2487 MS |
2766 | struct fuse_conn *fc = get_fuse_conn(inode); |
2767 | ||
c2132c1b | 2768 | if (!fuse_allow_current_process(fc)) |
d36f2487 MS |
2769 | return -EACCES; |
2770 | ||
2771 | if (is_bad_inode(inode)) | |
2772 | return -EIO; | |
2773 | ||
2774 | return fuse_do_ioctl(file, cmd, arg, flags); | |
2775 | } | |
2776 | ||
59efec7b TH |
2777 | static long fuse_file_ioctl(struct file *file, unsigned int cmd, |
2778 | unsigned long arg) | |
2779 | { | |
b18da0c5 | 2780 | return fuse_ioctl_common(file, cmd, arg, 0); |
59efec7b TH |
2781 | } |
2782 | ||
2783 | static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, | |
2784 | unsigned long arg) | |
2785 | { | |
b18da0c5 | 2786 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); |
59efec7b TH |
2787 | } |
2788 | ||
95668a69 TH |
2789 | /* |
2790 | * All files which have been polled are linked to RB tree | |
2791 | * fuse_conn->polled_files which is indexed by kh. Walk the tree and | |
2792 | * find the matching one. | |
2793 | */ | |
2794 | static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh, | |
2795 | struct rb_node **parent_out) | |
2796 | { | |
2797 | struct rb_node **link = &fc->polled_files.rb_node; | |
2798 | struct rb_node *last = NULL; | |
2799 | ||
2800 | while (*link) { | |
2801 | struct fuse_file *ff; | |
2802 | ||
2803 | last = *link; | |
2804 | ff = rb_entry(last, struct fuse_file, polled_node); | |
2805 | ||
2806 | if (kh < ff->kh) | |
2807 | link = &last->rb_left; | |
2808 | else if (kh > ff->kh) | |
2809 | link = &last->rb_right; | |
2810 | else | |
2811 | return link; | |
2812 | } | |
2813 | ||
2814 | if (parent_out) | |
2815 | *parent_out = last; | |
2816 | return link; | |
2817 | } | |
2818 | ||
2819 | /* | |
2820 | * The file is about to be polled. Make sure it's on the polled_files | |
2821 | * RB tree. Note that files once added to the polled_files tree are | |
2822 | * not removed before the file is released. This is because a file | |
2823 | * polled once is likely to be polled again. | |
2824 | */ | |
2825 | static void fuse_register_polled_file(struct fuse_conn *fc, | |
2826 | struct fuse_file *ff) | |
2827 | { | |
2828 | spin_lock(&fc->lock); | |
2829 | if (RB_EMPTY_NODE(&ff->polled_node)) { | |
f3846266 | 2830 | struct rb_node **link, *uninitialized_var(parent); |
95668a69 TH |
2831 | |
2832 | link = fuse_find_polled_node(fc, ff->kh, &parent); | |
2833 | BUG_ON(*link); | |
2834 | rb_link_node(&ff->polled_node, parent, link); | |
2835 | rb_insert_color(&ff->polled_node, &fc->polled_files); | |
2836 | } | |
2837 | spin_unlock(&fc->lock); | |
2838 | } | |
2839 | ||
076ccb76 | 2840 | __poll_t fuse_file_poll(struct file *file, poll_table *wait) |
95668a69 | 2841 | { |
95668a69 | 2842 | struct fuse_file *ff = file->private_data; |
797759aa | 2843 | struct fuse_conn *fc = ff->fc; |
95668a69 TH |
2844 | struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; |
2845 | struct fuse_poll_out outarg; | |
7078187a | 2846 | FUSE_ARGS(args); |
95668a69 TH |
2847 | int err; |
2848 | ||
2849 | if (fc->no_poll) | |
2850 | return DEFAULT_POLLMASK; | |
2851 | ||
2852 | poll_wait(file, &ff->poll_wait, wait); | |
c71d227f | 2853 | inarg.events = mangle_poll(poll_requested_events(wait)); |
95668a69 TH |
2854 | |
2855 | /* | |
2856 | * Ask for notification iff there's someone waiting for it. | |
2857 | * The client may ignore the flag and always notify. | |
2858 | */ | |
2859 | if (waitqueue_active(&ff->poll_wait)) { | |
2860 | inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY; | |
2861 | fuse_register_polled_file(fc, ff); | |
2862 | } | |
2863 | ||
7078187a MS |
2864 | args.in.h.opcode = FUSE_POLL; |
2865 | args.in.h.nodeid = ff->nodeid; | |
2866 | args.in.numargs = 1; | |
2867 | args.in.args[0].size = sizeof(inarg); | |
2868 | args.in.args[0].value = &inarg; | |
2869 | args.out.numargs = 1; | |
2870 | args.out.args[0].size = sizeof(outarg); | |
2871 | args.out.args[0].value = &outarg; | |
2872 | err = fuse_simple_request(fc, &args); | |
95668a69 TH |
2873 | |
2874 | if (!err) | |
c71d227f | 2875 | return demangle_poll(outarg.revents); |
95668a69 TH |
2876 | if (err == -ENOSYS) { |
2877 | fc->no_poll = 1; | |
2878 | return DEFAULT_POLLMASK; | |
2879 | } | |
a9a08845 | 2880 | return EPOLLERR; |
95668a69 | 2881 | } |
08cbf542 | 2882 | EXPORT_SYMBOL_GPL(fuse_file_poll); |
95668a69 TH |
2883 | |
2884 | /* | |
2885 | * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and | |
2886 | * wakes up the poll waiters. | |
2887 | */ | |
2888 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, | |
2889 | struct fuse_notify_poll_wakeup_out *outarg) | |
2890 | { | |
2891 | u64 kh = outarg->kh; | |
2892 | struct rb_node **link; | |
2893 | ||
2894 | spin_lock(&fc->lock); | |
2895 | ||
2896 | link = fuse_find_polled_node(fc, kh, NULL); | |
2897 | if (*link) { | |
2898 | struct fuse_file *ff; | |
2899 | ||
2900 | ff = rb_entry(*link, struct fuse_file, polled_node); | |
2901 | wake_up_interruptible_sync(&ff->poll_wait); | |
2902 | } | |
2903 | ||
2904 | spin_unlock(&fc->lock); | |
2905 | return 0; | |
2906 | } | |
2907 | ||
efb9fa9e MP |
2908 | static void fuse_do_truncate(struct file *file) |
2909 | { | |
2910 | struct inode *inode = file->f_mapping->host; | |
2911 | struct iattr attr; | |
2912 | ||
2913 | attr.ia_valid = ATTR_SIZE; | |
2914 | attr.ia_size = i_size_read(inode); | |
2915 | ||
2916 | attr.ia_file = file; | |
2917 | attr.ia_valid |= ATTR_FILE; | |
2918 | ||
62490330 | 2919 | fuse_do_setattr(file_dentry(file), &attr, file); |
efb9fa9e MP |
2920 | } |
2921 | ||
5da784cc | 2922 | static inline loff_t fuse_round_up(struct fuse_conn *fc, loff_t off) |
e5c5f05d | 2923 | { |
5da784cc | 2924 | return round_up(off, fc->max_pages << PAGE_SHIFT); |
e5c5f05d MP |
2925 | } |
2926 | ||
4273b793 | 2927 | static ssize_t |
c8b8e32d | 2928 | fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
4273b793 | 2929 | { |
9d5722b7 | 2930 | DECLARE_COMPLETION_ONSTACK(wait); |
4273b793 | 2931 | ssize_t ret = 0; |
60b9df7a MS |
2932 | struct file *file = iocb->ki_filp; |
2933 | struct fuse_file *ff = file->private_data; | |
e5c5f05d | 2934 | bool async_dio = ff->fc->async_dio; |
4273b793 | 2935 | loff_t pos = 0; |
bcba24cc MP |
2936 | struct inode *inode; |
2937 | loff_t i_size; | |
a6cbcd4a | 2938 | size_t count = iov_iter_count(iter); |
c8b8e32d | 2939 | loff_t offset = iocb->ki_pos; |
36cf66ed | 2940 | struct fuse_io_priv *io; |
4273b793 | 2941 | |
4273b793 | 2942 | pos = offset; |
bcba24cc MP |
2943 | inode = file->f_mapping->host; |
2944 | i_size = i_size_read(inode); | |
4273b793 | 2945 | |
6f673763 | 2946 | if ((iov_iter_rw(iter) == READ) && (offset > i_size)) |
9fe55eea SW |
2947 | return 0; |
2948 | ||
439ee5f0 | 2949 | /* optimization for short read */ |
6f673763 | 2950 | if (async_dio && iov_iter_rw(iter) != WRITE && offset + count > i_size) { |
439ee5f0 MP |
2951 | if (offset >= i_size) |
2952 | return 0; | |
5da784cc | 2953 | iov_iter_truncate(iter, fuse_round_up(ff->fc, i_size - offset)); |
6b775b18 | 2954 | count = iov_iter_count(iter); |
439ee5f0 MP |
2955 | } |
2956 | ||
bcba24cc | 2957 | io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL); |
36cf66ed MP |
2958 | if (!io) |
2959 | return -ENOMEM; | |
bcba24cc | 2960 | spin_lock_init(&io->lock); |
744742d6 | 2961 | kref_init(&io->refcnt); |
bcba24cc MP |
2962 | io->reqs = 1; |
2963 | io->bytes = -1; | |
2964 | io->size = 0; | |
2965 | io->offset = offset; | |
6f673763 | 2966 | io->write = (iov_iter_rw(iter) == WRITE); |
bcba24cc | 2967 | io->err = 0; |
bcba24cc MP |
2968 | /* |
2969 | * By default, we want to optimize all I/Os with async request | |
60b9df7a | 2970 | * submission to the client filesystem if supported. |
bcba24cc | 2971 | */ |
e5c5f05d | 2972 | io->async = async_dio; |
bcba24cc | 2973 | io->iocb = iocb; |
7879c4e5 | 2974 | io->blocking = is_sync_kiocb(iocb); |
bcba24cc MP |
2975 | |
2976 | /* | |
7879c4e5 AS |
2977 | * We cannot asynchronously extend the size of a file. |
2978 | * In such case the aio will behave exactly like sync io. | |
bcba24cc | 2979 | */ |
7879c4e5 AS |
2980 | if ((offset + count > i_size) && iov_iter_rw(iter) == WRITE) |
2981 | io->blocking = true; | |
4273b793 | 2982 | |
7879c4e5 | 2983 | if (io->async && io->blocking) { |
744742d6 SF |
2984 | /* |
2985 | * Additional reference to keep io around after | |
2986 | * calling fuse_aio_complete() | |
2987 | */ | |
2988 | kref_get(&io->refcnt); | |
9d5722b7 | 2989 | io->done = &wait; |
744742d6 | 2990 | } |
9d5722b7 | 2991 | |
6f673763 | 2992 | if (iov_iter_rw(iter) == WRITE) { |
6b775b18 | 2993 | ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE); |
812408fb AV |
2994 | fuse_invalidate_attr(inode); |
2995 | } else { | |
d22a943f | 2996 | ret = __fuse_direct_read(io, iter, &pos); |
812408fb | 2997 | } |
36cf66ed | 2998 | |
bcba24cc | 2999 | if (io->async) { |
ebacb812 LC |
3000 | bool blocking = io->blocking; |
3001 | ||
bcba24cc MP |
3002 | fuse_aio_complete(io, ret < 0 ? ret : 0, -1); |
3003 | ||
3004 | /* we have a non-extending, async request, so return */ | |
ebacb812 | 3005 | if (!blocking) |
bcba24cc MP |
3006 | return -EIOCBQUEUED; |
3007 | ||
9d5722b7 CH |
3008 | wait_for_completion(&wait); |
3009 | ret = fuse_get_res_by_io(io); | |
bcba24cc MP |
3010 | } |
3011 | ||
744742d6 | 3012 | kref_put(&io->refcnt, fuse_io_release); |
9d5722b7 | 3013 | |
6f673763 | 3014 | if (iov_iter_rw(iter) == WRITE) { |
efb9fa9e MP |
3015 | if (ret > 0) |
3016 | fuse_write_update_size(inode, pos); | |
3017 | else if (ret < 0 && offset + count > i_size) | |
3018 | fuse_do_truncate(file); | |
3019 | } | |
4273b793 AA |
3020 | |
3021 | return ret; | |
3022 | } | |
3023 | ||
26eb3bae MS |
3024 | static int fuse_writeback_range(struct inode *inode, loff_t start, loff_t end) |
3025 | { | |
3026 | int err = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
3027 | ||
3028 | if (!err) | |
3029 | fuse_sync_writes(inode); | |
3030 | ||
3031 | return err; | |
3032 | } | |
3033 | ||
cdadb11c MS |
3034 | static long fuse_file_fallocate(struct file *file, int mode, loff_t offset, |
3035 | loff_t length) | |
05ba1f08 AP |
3036 | { |
3037 | struct fuse_file *ff = file->private_data; | |
1c68271c | 3038 | struct inode *inode = file_inode(file); |
0ab08f57 | 3039 | struct fuse_inode *fi = get_fuse_inode(inode); |
05ba1f08 | 3040 | struct fuse_conn *fc = ff->fc; |
7078187a | 3041 | FUSE_ARGS(args); |
05ba1f08 AP |
3042 | struct fuse_fallocate_in inarg = { |
3043 | .fh = ff->fh, | |
3044 | .offset = offset, | |
3045 | .length = length, | |
3046 | .mode = mode | |
3047 | }; | |
3048 | int err; | |
14c14414 MP |
3049 | bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) || |
3050 | (mode & FALLOC_FL_PUNCH_HOLE); | |
05ba1f08 | 3051 | |
4adb8302 MS |
3052 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
3053 | return -EOPNOTSUPP; | |
3054 | ||
519c6040 MS |
3055 | if (fc->no_fallocate) |
3056 | return -EOPNOTSUPP; | |
3057 | ||
14c14414 | 3058 | if (lock_inode) { |
5955102c | 3059 | inode_lock(inode); |
bde52788 MP |
3060 | if (mode & FALLOC_FL_PUNCH_HOLE) { |
3061 | loff_t endbyte = offset + length - 1; | |
26eb3bae MS |
3062 | |
3063 | err = fuse_writeback_range(inode, offset, endbyte); | |
bde52788 MP |
3064 | if (err) |
3065 | goto out; | |
bde52788 | 3066 | } |
3634a632 BF |
3067 | } |
3068 | ||
0cbade02 LB |
3069 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
3070 | offset + length > i_size_read(inode)) { | |
3071 | err = inode_newsize_ok(inode, offset + length); | |
3072 | if (err) | |
35d6fcbb | 3073 | goto out; |
0cbade02 LB |
3074 | } |
3075 | ||
0ab08f57 MP |
3076 | if (!(mode & FALLOC_FL_KEEP_SIZE)) |
3077 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
3078 | ||
7078187a MS |
3079 | args.in.h.opcode = FUSE_FALLOCATE; |
3080 | args.in.h.nodeid = ff->nodeid; | |
3081 | args.in.numargs = 1; | |
3082 | args.in.args[0].size = sizeof(inarg); | |
3083 | args.in.args[0].value = &inarg; | |
3084 | err = fuse_simple_request(fc, &args); | |
519c6040 MS |
3085 | if (err == -ENOSYS) { |
3086 | fc->no_fallocate = 1; | |
3087 | err = -EOPNOTSUPP; | |
3088 | } | |
bee6c307 BF |
3089 | if (err) |
3090 | goto out; | |
3091 | ||
3092 | /* we could have extended the file */ | |
b0aa7606 MP |
3093 | if (!(mode & FALLOC_FL_KEEP_SIZE)) { |
3094 | bool changed = fuse_write_update_size(inode, offset + length); | |
3095 | ||
93d2269d MS |
3096 | if (changed && fc->writeback_cache) |
3097 | file_update_time(file); | |
b0aa7606 | 3098 | } |
bee6c307 BF |
3099 | |
3100 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
3101 | truncate_pagecache_range(inode, offset, offset + length - 1); | |
3102 | ||
3103 | fuse_invalidate_attr(inode); | |
3104 | ||
3634a632 | 3105 | out: |
0ab08f57 MP |
3106 | if (!(mode & FALLOC_FL_KEEP_SIZE)) |
3107 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
3108 | ||
bde52788 | 3109 | if (lock_inode) |
5955102c | 3110 | inode_unlock(inode); |
3634a632 | 3111 | |
05ba1f08 AP |
3112 | return err; |
3113 | } | |
05ba1f08 | 3114 | |
64bf5ff5 DC |
3115 | static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in, |
3116 | struct file *file_out, loff_t pos_out, | |
3117 | size_t len, unsigned int flags) | |
88bc7d50 NV |
3118 | { |
3119 | struct fuse_file *ff_in = file_in->private_data; | |
3120 | struct fuse_file *ff_out = file_out->private_data; | |
a2bc9236 | 3121 | struct inode *inode_in = file_inode(file_in); |
88bc7d50 NV |
3122 | struct inode *inode_out = file_inode(file_out); |
3123 | struct fuse_inode *fi_out = get_fuse_inode(inode_out); | |
3124 | struct fuse_conn *fc = ff_in->fc; | |
3125 | FUSE_ARGS(args); | |
3126 | struct fuse_copy_file_range_in inarg = { | |
3127 | .fh_in = ff_in->fh, | |
3128 | .off_in = pos_in, | |
3129 | .nodeid_out = ff_out->nodeid, | |
3130 | .fh_out = ff_out->fh, | |
3131 | .off_out = pos_out, | |
3132 | .len = len, | |
3133 | .flags = flags | |
3134 | }; | |
3135 | struct fuse_write_out outarg; | |
3136 | ssize_t err; | |
3137 | /* mark unstable when write-back is not used, and file_out gets | |
3138 | * extended */ | |
3139 | bool is_unstable = (!fc->writeback_cache) && | |
3140 | ((pos_out + len) > inode_out->i_size); | |
3141 | ||
3142 | if (fc->no_copy_file_range) | |
3143 | return -EOPNOTSUPP; | |
3144 | ||
5dae222a AG |
3145 | if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb) |
3146 | return -EXDEV; | |
3147 | ||
a2bc9236 MS |
3148 | if (fc->writeback_cache) { |
3149 | inode_lock(inode_in); | |
26eb3bae | 3150 | err = fuse_writeback_range(inode_in, pos_in, pos_in + len); |
a2bc9236 MS |
3151 | inode_unlock(inode_in); |
3152 | if (err) | |
3153 | return err; | |
3154 | } | |
3155 | ||
88bc7d50 NV |
3156 | inode_lock(inode_out); |
3157 | ||
fe0da9c0 AG |
3158 | err = file_modified(file_out); |
3159 | if (err) | |
3160 | goto out; | |
3161 | ||
88bc7d50 | 3162 | if (fc->writeback_cache) { |
26eb3bae | 3163 | err = fuse_writeback_range(inode_out, pos_out, pos_out + len); |
88bc7d50 NV |
3164 | if (err) |
3165 | goto out; | |
88bc7d50 NV |
3166 | } |
3167 | ||
3168 | if (is_unstable) | |
3169 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi_out->state); | |
3170 | ||
3171 | args.in.h.opcode = FUSE_COPY_FILE_RANGE; | |
3172 | args.in.h.nodeid = ff_in->nodeid; | |
3173 | args.in.numargs = 1; | |
3174 | args.in.args[0].size = sizeof(inarg); | |
3175 | args.in.args[0].value = &inarg; | |
3176 | args.out.numargs = 1; | |
3177 | args.out.args[0].size = sizeof(outarg); | |
3178 | args.out.args[0].value = &outarg; | |
3179 | err = fuse_simple_request(fc, &args); | |
3180 | if (err == -ENOSYS) { | |
3181 | fc->no_copy_file_range = 1; | |
3182 | err = -EOPNOTSUPP; | |
3183 | } | |
3184 | if (err) | |
3185 | goto out; | |
3186 | ||
3187 | if (fc->writeback_cache) { | |
3188 | fuse_write_update_size(inode_out, pos_out + outarg.size); | |
3189 | file_update_time(file_out); | |
3190 | } | |
3191 | ||
3192 | fuse_invalidate_attr(inode_out); | |
3193 | ||
3194 | err = outarg.size; | |
3195 | out: | |
3196 | if (is_unstable) | |
3197 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi_out->state); | |
3198 | ||
3199 | inode_unlock(inode_out); | |
fe0da9c0 | 3200 | file_accessed(file_in); |
88bc7d50 NV |
3201 | |
3202 | return err; | |
3203 | } | |
3204 | ||
64bf5ff5 DC |
3205 | static ssize_t fuse_copy_file_range(struct file *src_file, loff_t src_off, |
3206 | struct file *dst_file, loff_t dst_off, | |
3207 | size_t len, unsigned int flags) | |
3208 | { | |
3209 | ssize_t ret; | |
3210 | ||
3211 | ret = __fuse_copy_file_range(src_file, src_off, dst_file, dst_off, | |
3212 | len, flags); | |
3213 | ||
5dae222a | 3214 | if (ret == -EOPNOTSUPP || ret == -EXDEV) |
64bf5ff5 DC |
3215 | ret = generic_copy_file_range(src_file, src_off, dst_file, |
3216 | dst_off, len, flags); | |
3217 | return ret; | |
3218 | } | |
3219 | ||
4b6f5d20 | 3220 | static const struct file_operations fuse_file_operations = { |
5559b8f4 | 3221 | .llseek = fuse_file_llseek, |
37c20f16 | 3222 | .read_iter = fuse_file_read_iter, |
84c3d55c | 3223 | .write_iter = fuse_file_write_iter, |
b6aeaded MS |
3224 | .mmap = fuse_file_mmap, |
3225 | .open = fuse_open, | |
3226 | .flush = fuse_flush, | |
3227 | .release = fuse_release, | |
3228 | .fsync = fuse_fsync, | |
71421259 | 3229 | .lock = fuse_file_lock, |
a9ff4f87 | 3230 | .flock = fuse_file_flock, |
3c3db095 MS |
3231 | .splice_read = generic_file_splice_read, |
3232 | .splice_write = iter_file_splice_write, | |
59efec7b TH |
3233 | .unlocked_ioctl = fuse_file_ioctl, |
3234 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 3235 | .poll = fuse_file_poll, |
05ba1f08 | 3236 | .fallocate = fuse_file_fallocate, |
d4136d60 | 3237 | .copy_file_range = fuse_copy_file_range, |
413ef8cb MS |
3238 | }; |
3239 | ||
f5e54d6e | 3240 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 3241 | .readpage = fuse_readpage, |
3be5a52b | 3242 | .writepage = fuse_writepage, |
26d614df | 3243 | .writepages = fuse_writepages, |
3be5a52b | 3244 | .launder_page = fuse_launder_page, |
db50b96c | 3245 | .readpages = fuse_readpages, |
3be5a52b | 3246 | .set_page_dirty = __set_page_dirty_nobuffers, |
b2d2272f | 3247 | .bmap = fuse_bmap, |
4273b793 | 3248 | .direct_IO = fuse_direct_IO, |
6b12c1b3 PE |
3249 | .write_begin = fuse_write_begin, |
3250 | .write_end = fuse_write_end, | |
b6aeaded MS |
3251 | }; |
3252 | ||
3253 | void fuse_init_file_inode(struct inode *inode) | |
3254 | { | |
ab2257e9 MS |
3255 | struct fuse_inode *fi = get_fuse_inode(inode); |
3256 | ||
45323fb7 MS |
3257 | inode->i_fop = &fuse_file_operations; |
3258 | inode->i_data.a_ops = &fuse_file_aops; | |
ab2257e9 MS |
3259 | |
3260 | INIT_LIST_HEAD(&fi->write_files); | |
3261 | INIT_LIST_HEAD(&fi->queued_writes); | |
3262 | fi->writectr = 0; | |
3263 | init_waitqueue_head(&fi->page_waitq); | |
3264 | INIT_LIST_HEAD(&fi->writepages); | |
b6aeaded | 3265 | } |