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Commit | Line | Data |
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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 | |
4b6f5d20 | 22 | static const struct file_operations fuse_direct_io_file_operations; |
45323fb7 | 23 | |
91fe96b4 MS |
24 | static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
25 | int opcode, struct fuse_open_out *outargp) | |
b6aeaded | 26 | { |
b6aeaded | 27 | struct fuse_open_in inarg; |
7078187a | 28 | FUSE_ARGS(args); |
fd72faac MS |
29 | |
30 | memset(&inarg, 0, sizeof(inarg)); | |
6ff958ed MS |
31 | inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY); |
32 | if (!fc->atomic_o_trunc) | |
33 | inarg.flags &= ~O_TRUNC; | |
7078187a MS |
34 | args.in.h.opcode = opcode; |
35 | args.in.h.nodeid = nodeid; | |
36 | args.in.numargs = 1; | |
37 | args.in.args[0].size = sizeof(inarg); | |
38 | args.in.args[0].value = &inarg; | |
39 | args.out.numargs = 1; | |
40 | args.out.args[0].size = sizeof(*outargp); | |
41 | args.out.args[0].value = outargp; | |
fd72faac | 42 | |
7078187a | 43 | return fuse_simple_request(fc, &args); |
fd72faac MS |
44 | } |
45 | ||
acf99433 | 46 | struct fuse_file *fuse_file_alloc(struct fuse_conn *fc) |
fd72faac MS |
47 | { |
48 | struct fuse_file *ff; | |
6b2db28a | 49 | |
68227c03 | 50 | ff = kzalloc(sizeof(struct fuse_file), GFP_KERNEL); |
6b2db28a TH |
51 | if (unlikely(!ff)) |
52 | return NULL; | |
53 | ||
da5e4714 | 54 | ff->fc = fc; |
4250c066 | 55 | ff->reserved_req = fuse_request_alloc(0); |
6b2db28a TH |
56 | if (unlikely(!ff->reserved_req)) { |
57 | kfree(ff); | |
58 | return NULL; | |
fd72faac | 59 | } |
6b2db28a TH |
60 | |
61 | INIT_LIST_HEAD(&ff->write_entry); | |
5d7bc7e8 | 62 | mutex_init(&ff->readdir.lock); |
4e8c2eb5 | 63 | refcount_set(&ff->count, 1); |
6b2db28a TH |
64 | RB_CLEAR_NODE(&ff->polled_node); |
65 | init_waitqueue_head(&ff->poll_wait); | |
66 | ||
75126f55 | 67 | ff->kh = atomic64_inc_return(&fc->khctr); |
6b2db28a | 68 | |
fd72faac MS |
69 | return ff; |
70 | } | |
71 | ||
72 | void fuse_file_free(struct fuse_file *ff) | |
73 | { | |
33649c91 | 74 | fuse_request_free(ff->reserved_req); |
5d7bc7e8 | 75 | mutex_destroy(&ff->readdir.lock); |
fd72faac MS |
76 | kfree(ff); |
77 | } | |
78 | ||
267d8444 | 79 | static struct fuse_file *fuse_file_get(struct fuse_file *ff) |
c756e0a4 | 80 | { |
4e8c2eb5 | 81 | refcount_inc(&ff->count); |
c756e0a4 MS |
82 | return ff; |
83 | } | |
84 | ||
819c4b3b MS |
85 | static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) |
86 | { | |
baebccbe | 87 | iput(req->misc.release.inode); |
819c4b3b MS |
88 | } |
89 | ||
2e64ff15 | 90 | static void fuse_file_put(struct fuse_file *ff, bool sync, bool isdir) |
c756e0a4 | 91 | { |
4e8c2eb5 | 92 | if (refcount_dec_and_test(&ff->count)) { |
c756e0a4 | 93 | struct fuse_req *req = ff->reserved_req; |
8b0797a4 | 94 | |
2e64ff15 | 95 | if (ff->fc->no_open && !isdir) { |
7678ac50 AG |
96 | /* |
97 | * Drop the release request when client does not | |
98 | * implement 'open' | |
99 | */ | |
825d6d33 | 100 | __clear_bit(FR_BACKGROUND, &req->flags); |
baebccbe | 101 | iput(req->misc.release.inode); |
7678ac50 AG |
102 | fuse_put_request(ff->fc, req); |
103 | } else if (sync) { | |
2e38bea9 | 104 | __set_bit(FR_FORCE, &req->flags); |
825d6d33 | 105 | __clear_bit(FR_BACKGROUND, &req->flags); |
5a18ec17 | 106 | fuse_request_send(ff->fc, req); |
baebccbe | 107 | iput(req->misc.release.inode); |
5a18ec17 MS |
108 | fuse_put_request(ff->fc, req); |
109 | } else { | |
110 | req->end = fuse_release_end; | |
825d6d33 | 111 | __set_bit(FR_BACKGROUND, &req->flags); |
5a18ec17 MS |
112 | fuse_request_send_background(ff->fc, req); |
113 | } | |
c756e0a4 MS |
114 | kfree(ff); |
115 | } | |
116 | } | |
117 | ||
08cbf542 TH |
118 | int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
119 | bool isdir) | |
91fe96b4 | 120 | { |
91fe96b4 | 121 | struct fuse_file *ff; |
91fe96b4 MS |
122 | int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; |
123 | ||
124 | ff = fuse_file_alloc(fc); | |
125 | if (!ff) | |
126 | return -ENOMEM; | |
127 | ||
7678ac50 AG |
128 | ff->fh = 0; |
129 | ff->open_flags = FOPEN_KEEP_CACHE; /* Default for no-open */ | |
130 | if (!fc->no_open || isdir) { | |
131 | struct fuse_open_out outarg; | |
132 | int err; | |
133 | ||
134 | err = fuse_send_open(fc, nodeid, file, opcode, &outarg); | |
135 | if (!err) { | |
136 | ff->fh = outarg.fh; | |
137 | ff->open_flags = outarg.open_flags; | |
138 | ||
139 | } else if (err != -ENOSYS || isdir) { | |
140 | fuse_file_free(ff); | |
141 | return err; | |
142 | } else { | |
143 | fc->no_open = 1; | |
144 | } | |
91fe96b4 MS |
145 | } |
146 | ||
147 | if (isdir) | |
7678ac50 | 148 | ff->open_flags &= ~FOPEN_DIRECT_IO; |
91fe96b4 | 149 | |
91fe96b4 | 150 | ff->nodeid = nodeid; |
267d8444 | 151 | file->private_data = ff; |
91fe96b4 MS |
152 | |
153 | return 0; | |
154 | } | |
08cbf542 | 155 | EXPORT_SYMBOL_GPL(fuse_do_open); |
91fe96b4 | 156 | |
650b22b9 PE |
157 | static void fuse_link_write_file(struct file *file) |
158 | { | |
159 | struct inode *inode = file_inode(file); | |
650b22b9 PE |
160 | struct fuse_inode *fi = get_fuse_inode(inode); |
161 | struct fuse_file *ff = file->private_data; | |
162 | /* | |
163 | * file may be written through mmap, so chain it onto the | |
164 | * inodes's write_file list | |
165 | */ | |
f15ecfef | 166 | spin_lock(&fi->lock); |
650b22b9 PE |
167 | if (list_empty(&ff->write_entry)) |
168 | list_add(&ff->write_entry, &fi->write_files); | |
f15ecfef | 169 | spin_unlock(&fi->lock); |
650b22b9 PE |
170 | } |
171 | ||
c7b7143c | 172 | void fuse_finish_open(struct inode *inode, struct file *file) |
fd72faac | 173 | { |
c7b7143c | 174 | struct fuse_file *ff = file->private_data; |
a0822c55 | 175 | struct fuse_conn *fc = get_fuse_conn(inode); |
c7b7143c MS |
176 | |
177 | if (ff->open_flags & FOPEN_DIRECT_IO) | |
fd72faac | 178 | file->f_op = &fuse_direct_io_file_operations; |
c7b7143c | 179 | if (!(ff->open_flags & FOPEN_KEEP_CACHE)) |
b1009979 | 180 | invalidate_inode_pages2(inode->i_mapping); |
c7b7143c | 181 | if (ff->open_flags & FOPEN_NONSEEKABLE) |
a7c1b990 | 182 | nonseekable_open(inode, file); |
a0822c55 KS |
183 | if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) { |
184 | struct fuse_inode *fi = get_fuse_inode(inode); | |
185 | ||
f15ecfef | 186 | spin_lock(&fi->lock); |
4510d86f | 187 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
a0822c55 | 188 | i_size_write(inode, 0); |
f15ecfef | 189 | spin_unlock(&fi->lock); |
a0822c55 | 190 | fuse_invalidate_attr(inode); |
75caeecd MP |
191 | if (fc->writeback_cache) |
192 | file_update_time(file); | |
a0822c55 | 193 | } |
4d99ff8f PE |
194 | if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache) |
195 | fuse_link_write_file(file); | |
fd72faac MS |
196 | } |
197 | ||
91fe96b4 | 198 | int fuse_open_common(struct inode *inode, struct file *file, bool isdir) |
fd72faac | 199 | { |
acf99433 | 200 | struct fuse_conn *fc = get_fuse_conn(inode); |
b6aeaded | 201 | int err; |
75caeecd MP |
202 | bool lock_inode = (file->f_flags & O_TRUNC) && |
203 | fc->atomic_o_trunc && | |
204 | fc->writeback_cache; | |
b6aeaded MS |
205 | |
206 | err = generic_file_open(inode, file); | |
207 | if (err) | |
208 | return err; | |
209 | ||
75caeecd | 210 | if (lock_inode) |
5955102c | 211 | inode_lock(inode); |
75caeecd | 212 | |
91fe96b4 | 213 | err = fuse_do_open(fc, get_node_id(inode), file, isdir); |
b6aeaded | 214 | |
75caeecd MP |
215 | if (!err) |
216 | fuse_finish_open(inode, file); | |
91fe96b4 | 217 | |
75caeecd | 218 | if (lock_inode) |
5955102c | 219 | inode_unlock(inode); |
75caeecd MP |
220 | |
221 | return err; | |
b6aeaded MS |
222 | } |
223 | ||
ebf84d0c KT |
224 | static void fuse_prepare_release(struct fuse_inode *fi, struct fuse_file *ff, |
225 | int flags, int opcode) | |
64c6d8ed | 226 | { |
8b0797a4 | 227 | struct fuse_conn *fc = ff->fc; |
33649c91 | 228 | struct fuse_req *req = ff->reserved_req; |
b57d4264 | 229 | struct fuse_release_in *inarg = &req->misc.release.in; |
b6aeaded | 230 | |
f15ecfef KT |
231 | /* Inode is NULL on error path of fuse_create_open() */ |
232 | if (likely(fi)) { | |
233 | spin_lock(&fi->lock); | |
234 | list_del(&ff->write_entry); | |
235 | spin_unlock(&fi->lock); | |
236 | } | |
8b0797a4 | 237 | spin_lock(&fc->lock); |
8b0797a4 MS |
238 | if (!RB_EMPTY_NODE(&ff->polled_node)) |
239 | rb_erase(&ff->polled_node, &fc->polled_files); | |
240 | spin_unlock(&fc->lock); | |
241 | ||
357ccf2b | 242 | wake_up_interruptible_all(&ff->poll_wait); |
8b0797a4 | 243 | |
b6aeaded | 244 | inarg->fh = ff->fh; |
fd72faac | 245 | inarg->flags = flags; |
51eb01e7 | 246 | req->in.h.opcode = opcode; |
c7b7143c | 247 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
248 | req->in.numargs = 1; |
249 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
250 | req->in.args[0].value = inarg; | |
fd72faac MS |
251 | } |
252 | ||
2e64ff15 | 253 | void fuse_release_common(struct file *file, bool isdir) |
fd72faac | 254 | { |
ebf84d0c | 255 | struct fuse_inode *fi = get_fuse_inode(file_inode(file)); |
9a87ad3d MS |
256 | struct fuse_file *ff = file->private_data; |
257 | struct fuse_req *req = ff->reserved_req; | |
2e64ff15 | 258 | int opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE; |
6b2db28a | 259 | |
ebf84d0c | 260 | fuse_prepare_release(fi, ff, file->f_flags, opcode); |
6b2db28a | 261 | |
37fb3a30 MS |
262 | if (ff->flock) { |
263 | struct fuse_release_in *inarg = &req->misc.release.in; | |
264 | inarg->release_flags |= FUSE_RELEASE_FLOCK_UNLOCK; | |
265 | inarg->lock_owner = fuse_lock_owner_id(ff->fc, | |
266 | (fl_owner_t) file); | |
267 | } | |
baebccbe MS |
268 | /* Hold inode until release is finished */ |
269 | req->misc.release.inode = igrab(file_inode(file)); | |
6b2db28a | 270 | |
6b2db28a TH |
271 | /* |
272 | * Normally this will send the RELEASE request, however if | |
273 | * some asynchronous READ or WRITE requests are outstanding, | |
274 | * the sending will be delayed. | |
5a18ec17 MS |
275 | * |
276 | * Make the release synchronous if this is a fuseblk mount, | |
277 | * synchronous RELEASE is allowed (and desirable) in this case | |
278 | * because the server can be trusted not to screw up. | |
6b2db28a | 279 | */ |
2e64ff15 | 280 | fuse_file_put(ff, ff->fc->destroy_req != NULL, isdir); |
b6aeaded MS |
281 | } |
282 | ||
04730fef MS |
283 | static int fuse_open(struct inode *inode, struct file *file) |
284 | { | |
91fe96b4 | 285 | return fuse_open_common(inode, file, false); |
04730fef MS |
286 | } |
287 | ||
288 | static int fuse_release(struct inode *inode, struct file *file) | |
289 | { | |
e7cc133c PE |
290 | struct fuse_conn *fc = get_fuse_conn(inode); |
291 | ||
292 | /* see fuse_vma_close() for !writeback_cache case */ | |
293 | if (fc->writeback_cache) | |
1e18bda8 | 294 | write_inode_now(inode, 1); |
b0aa7606 | 295 | |
2e64ff15 | 296 | fuse_release_common(file, false); |
8b0797a4 MS |
297 | |
298 | /* return value is ignored by VFS */ | |
299 | return 0; | |
300 | } | |
301 | ||
ebf84d0c | 302 | void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff, int flags) |
8b0797a4 | 303 | { |
4e8c2eb5 | 304 | WARN_ON(refcount_read(&ff->count) > 1); |
ebf84d0c | 305 | fuse_prepare_release(fi, ff, flags, FUSE_RELEASE); |
267d8444 MS |
306 | /* |
307 | * iput(NULL) is a no-op and since the refcount is 1 and everything's | |
308 | * synchronous, we are fine with not doing igrab() here" | |
309 | */ | |
2e64ff15 | 310 | fuse_file_put(ff, true, false); |
04730fef | 311 | } |
08cbf542 | 312 | EXPORT_SYMBOL_GPL(fuse_sync_release); |
04730fef | 313 | |
71421259 | 314 | /* |
9c8ef561 MS |
315 | * Scramble the ID space with XTEA, so that the value of the files_struct |
316 | * pointer is not exposed to userspace. | |
71421259 | 317 | */ |
f3332114 | 318 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 319 | { |
9c8ef561 MS |
320 | u32 *k = fc->scramble_key; |
321 | u64 v = (unsigned long) id; | |
322 | u32 v0 = v; | |
323 | u32 v1 = v >> 32; | |
324 | u32 sum = 0; | |
325 | int i; | |
326 | ||
327 | for (i = 0; i < 32; i++) { | |
328 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
329 | sum += 0x9E3779B9; | |
330 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
331 | } | |
332 | ||
333 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
334 | } |
335 | ||
2fe93bd4 MS |
336 | static struct fuse_req *fuse_find_writeback(struct fuse_inode *fi, |
337 | pgoff_t idx_from, pgoff_t idx_to) | |
338 | { | |
339 | struct fuse_req *req; | |
340 | ||
341 | list_for_each_entry(req, &fi->writepages, writepages_entry) { | |
342 | pgoff_t curr_index; | |
343 | ||
344 | WARN_ON(get_fuse_inode(req->inode) != fi); | |
345 | curr_index = req->misc.write.in.offset >> PAGE_SHIFT; | |
346 | if (idx_from < curr_index + req->num_pages && | |
347 | curr_index <= idx_to) { | |
348 | return req; | |
349 | } | |
350 | } | |
351 | return NULL; | |
352 | } | |
353 | ||
3be5a52b | 354 | /* |
ea8cd333 | 355 | * Check if any page in a range is under writeback |
3be5a52b MS |
356 | * |
357 | * This is currently done by walking the list of writepage requests | |
358 | * for the inode, which can be pretty inefficient. | |
359 | */ | |
ea8cd333 PE |
360 | static bool fuse_range_is_writeback(struct inode *inode, pgoff_t idx_from, |
361 | pgoff_t idx_to) | |
3be5a52b | 362 | { |
3be5a52b | 363 | struct fuse_inode *fi = get_fuse_inode(inode); |
2fe93bd4 | 364 | bool found; |
3be5a52b | 365 | |
f15ecfef | 366 | spin_lock(&fi->lock); |
2fe93bd4 | 367 | found = fuse_find_writeback(fi, idx_from, idx_to); |
f15ecfef | 368 | spin_unlock(&fi->lock); |
3be5a52b MS |
369 | |
370 | return found; | |
371 | } | |
372 | ||
ea8cd333 PE |
373 | static inline bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) |
374 | { | |
375 | return fuse_range_is_writeback(inode, index, index); | |
376 | } | |
377 | ||
3be5a52b MS |
378 | /* |
379 | * Wait for page writeback to be completed. | |
380 | * | |
381 | * Since fuse doesn't rely on the VM writeback tracking, this has to | |
382 | * use some other means. | |
383 | */ | |
384 | static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) | |
385 | { | |
386 | struct fuse_inode *fi = get_fuse_inode(inode); | |
387 | ||
388 | wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); | |
389 | return 0; | |
390 | } | |
391 | ||
fe38d7df MP |
392 | /* |
393 | * Wait for all pending writepages on the inode to finish. | |
394 | * | |
395 | * This is currently done by blocking further writes with FUSE_NOWRITE | |
396 | * and waiting for all sent writes to complete. | |
397 | * | |
398 | * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage | |
399 | * could conflict with truncation. | |
400 | */ | |
401 | static void fuse_sync_writes(struct inode *inode) | |
402 | { | |
403 | fuse_set_nowrite(inode); | |
404 | fuse_release_nowrite(inode); | |
405 | } | |
406 | ||
75e1fcc0 | 407 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 408 | { |
6131ffaa | 409 | struct inode *inode = file_inode(file); |
b6aeaded MS |
410 | struct fuse_conn *fc = get_fuse_conn(inode); |
411 | struct fuse_file *ff = file->private_data; | |
412 | struct fuse_req *req; | |
413 | struct fuse_flush_in inarg; | |
414 | int err; | |
415 | ||
248d86e8 MS |
416 | if (is_bad_inode(inode)) |
417 | return -EIO; | |
418 | ||
b6aeaded MS |
419 | if (fc->no_flush) |
420 | return 0; | |
421 | ||
1e18bda8 | 422 | err = write_inode_now(inode, 1); |
fe38d7df MP |
423 | if (err) |
424 | return err; | |
425 | ||
5955102c | 426 | inode_lock(inode); |
fe38d7df | 427 | fuse_sync_writes(inode); |
5955102c | 428 | inode_unlock(inode); |
fe38d7df | 429 | |
4a7f4e88 | 430 | err = filemap_check_errors(file->f_mapping); |
9ebce595 MP |
431 | if (err) |
432 | return err; | |
433 | ||
b111c8c0 | 434 | req = fuse_get_req_nofail_nopages(fc, file); |
b6aeaded MS |
435 | memset(&inarg, 0, sizeof(inarg)); |
436 | inarg.fh = ff->fh; | |
9c8ef561 | 437 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
438 | req->in.h.opcode = FUSE_FLUSH; |
439 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
440 | req->in.numargs = 1; |
441 | req->in.args[0].size = sizeof(inarg); | |
442 | req->in.args[0].value = &inarg; | |
825d6d33 | 443 | __set_bit(FR_FORCE, &req->flags); |
b93f858a | 444 | fuse_request_send(fc, req); |
b6aeaded MS |
445 | err = req->out.h.error; |
446 | fuse_put_request(fc, req); | |
447 | if (err == -ENOSYS) { | |
448 | fc->no_flush = 1; | |
449 | err = 0; | |
450 | } | |
451 | return err; | |
452 | } | |
453 | ||
02c24a82 | 454 | int fuse_fsync_common(struct file *file, loff_t start, loff_t end, |
a9c2d1e8 | 455 | int datasync, int opcode) |
b6aeaded | 456 | { |
7ea80859 | 457 | struct inode *inode = file->f_mapping->host; |
b6aeaded MS |
458 | struct fuse_conn *fc = get_fuse_conn(inode); |
459 | struct fuse_file *ff = file->private_data; | |
7078187a | 460 | FUSE_ARGS(args); |
b6aeaded | 461 | struct fuse_fsync_in inarg; |
a9c2d1e8 MS |
462 | |
463 | memset(&inarg, 0, sizeof(inarg)); | |
464 | inarg.fh = ff->fh; | |
465 | inarg.fsync_flags = datasync ? 1 : 0; | |
466 | args.in.h.opcode = opcode; | |
467 | args.in.h.nodeid = get_node_id(inode); | |
468 | args.in.numargs = 1; | |
469 | args.in.args[0].size = sizeof(inarg); | |
470 | args.in.args[0].value = &inarg; | |
471 | return fuse_simple_request(fc, &args); | |
472 | } | |
473 | ||
474 | static int fuse_fsync(struct file *file, loff_t start, loff_t end, | |
475 | int datasync) | |
476 | { | |
477 | struct inode *inode = file->f_mapping->host; | |
478 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b6aeaded MS |
479 | int err; |
480 | ||
248d86e8 MS |
481 | if (is_bad_inode(inode)) |
482 | return -EIO; | |
483 | ||
5955102c | 484 | inode_lock(inode); |
02c24a82 | 485 | |
3be5a52b MS |
486 | /* |
487 | * Start writeback against all dirty pages of the inode, then | |
488 | * wait for all outstanding writes, before sending the FSYNC | |
489 | * request. | |
490 | */ | |
7e51fe1d | 491 | err = file_write_and_wait_range(file, start, end); |
3be5a52b | 492 | if (err) |
02c24a82 | 493 | goto out; |
3be5a52b MS |
494 | |
495 | fuse_sync_writes(inode); | |
ac7f052b AK |
496 | |
497 | /* | |
498 | * Due to implementation of fuse writeback | |
7e51fe1d | 499 | * file_write_and_wait_range() does not catch errors. |
ac7f052b AK |
500 | * We have to do this directly after fuse_sync_writes() |
501 | */ | |
7e51fe1d | 502 | err = file_check_and_advance_wb_err(file); |
ac7f052b AK |
503 | if (err) |
504 | goto out; | |
505 | ||
1e18bda8 MS |
506 | err = sync_inode_metadata(inode, 1); |
507 | if (err) | |
508 | goto out; | |
3be5a52b | 509 | |
a9c2d1e8 | 510 | if (fc->no_fsync) |
22401e7b | 511 | goto out; |
b0aa7606 | 512 | |
a9c2d1e8 | 513 | err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNC); |
b6aeaded | 514 | if (err == -ENOSYS) { |
a9c2d1e8 | 515 | fc->no_fsync = 1; |
b6aeaded MS |
516 | err = 0; |
517 | } | |
02c24a82 | 518 | out: |
5955102c | 519 | inode_unlock(inode); |
b6aeaded | 520 | |
a9c2d1e8 | 521 | return err; |
82547981 MS |
522 | } |
523 | ||
2106cb18 MS |
524 | void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos, |
525 | size_t count, int opcode) | |
b6aeaded | 526 | { |
5c5c5e51 | 527 | struct fuse_read_in *inarg = &req->misc.read.in; |
a6643094 | 528 | struct fuse_file *ff = file->private_data; |
b6aeaded | 529 | |
361b1eb5 MS |
530 | inarg->fh = ff->fh; |
531 | inarg->offset = pos; | |
532 | inarg->size = count; | |
a6643094 | 533 | inarg->flags = file->f_flags; |
361b1eb5 | 534 | req->in.h.opcode = opcode; |
2106cb18 | 535 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
536 | req->in.numargs = 1; |
537 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 538 | req->in.args[0].value = inarg; |
b6aeaded MS |
539 | req->out.argvar = 1; |
540 | req->out.numargs = 1; | |
541 | req->out.args[0].size = count; | |
b6aeaded MS |
542 | } |
543 | ||
8fba54ae | 544 | static void fuse_release_user_pages(struct fuse_req *req, bool should_dirty) |
187c5c36 MP |
545 | { |
546 | unsigned i; | |
547 | ||
548 | for (i = 0; i < req->num_pages; i++) { | |
549 | struct page *page = req->pages[i]; | |
8fba54ae | 550 | if (should_dirty) |
187c5c36 MP |
551 | set_page_dirty_lock(page); |
552 | put_page(page); | |
553 | } | |
554 | } | |
555 | ||
744742d6 SF |
556 | static void fuse_io_release(struct kref *kref) |
557 | { | |
558 | kfree(container_of(kref, struct fuse_io_priv, refcnt)); | |
559 | } | |
560 | ||
9d5722b7 CH |
561 | static ssize_t fuse_get_res_by_io(struct fuse_io_priv *io) |
562 | { | |
563 | if (io->err) | |
564 | return io->err; | |
565 | ||
566 | if (io->bytes >= 0 && io->write) | |
567 | return -EIO; | |
568 | ||
569 | return io->bytes < 0 ? io->size : io->bytes; | |
570 | } | |
571 | ||
01e9d11a MP |
572 | /** |
573 | * In case of short read, the caller sets 'pos' to the position of | |
574 | * actual end of fuse request in IO request. Otherwise, if bytes_requested | |
575 | * == bytes_transferred or rw == WRITE, the caller sets 'pos' to -1. | |
576 | * | |
577 | * An example: | |
578 | * User requested DIO read of 64K. It was splitted into two 32K fuse requests, | |
579 | * both submitted asynchronously. The first of them was ACKed by userspace as | |
580 | * fully completed (req->out.args[0].size == 32K) resulting in pos == -1. The | |
581 | * second request was ACKed as short, e.g. only 1K was read, resulting in | |
582 | * pos == 33K. | |
583 | * | |
584 | * Thus, when all fuse requests are completed, the minimal non-negative 'pos' | |
585 | * will be equal to the length of the longest contiguous fragment of | |
586 | * transferred data starting from the beginning of IO request. | |
587 | */ | |
588 | static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos) | |
589 | { | |
590 | int left; | |
591 | ||
592 | spin_lock(&io->lock); | |
593 | if (err) | |
594 | io->err = io->err ? : err; | |
595 | else if (pos >= 0 && (io->bytes < 0 || pos < io->bytes)) | |
596 | io->bytes = pos; | |
597 | ||
598 | left = --io->reqs; | |
7879c4e5 | 599 | if (!left && io->blocking) |
9d5722b7 | 600 | complete(io->done); |
01e9d11a MP |
601 | spin_unlock(&io->lock); |
602 | ||
7879c4e5 | 603 | if (!left && !io->blocking) { |
9d5722b7 | 604 | ssize_t res = fuse_get_res_by_io(io); |
01e9d11a | 605 | |
9d5722b7 CH |
606 | if (res >= 0) { |
607 | struct inode *inode = file_inode(io->iocb->ki_filp); | |
608 | struct fuse_conn *fc = get_fuse_conn(inode); | |
609 | struct fuse_inode *fi = get_fuse_inode(inode); | |
01e9d11a | 610 | |
f15ecfef | 611 | spin_lock(&fi->lock); |
4510d86f | 612 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
f15ecfef | 613 | spin_unlock(&fi->lock); |
01e9d11a MP |
614 | } |
615 | ||
04b2fa9f | 616 | io->iocb->ki_complete(io->iocb, res, 0); |
01e9d11a | 617 | } |
744742d6 SF |
618 | |
619 | kref_put(&io->refcnt, fuse_io_release); | |
01e9d11a MP |
620 | } |
621 | ||
622 | static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_req *req) | |
623 | { | |
624 | struct fuse_io_priv *io = req->io; | |
625 | ssize_t pos = -1; | |
626 | ||
61c12b49 | 627 | fuse_release_user_pages(req, io->should_dirty); |
01e9d11a MP |
628 | |
629 | if (io->write) { | |
630 | if (req->misc.write.in.size != req->misc.write.out.size) | |
631 | pos = req->misc.write.in.offset - io->offset + | |
632 | req->misc.write.out.size; | |
633 | } else { | |
634 | if (req->misc.read.in.size != req->out.args[0].size) | |
635 | pos = req->misc.read.in.offset - io->offset + | |
636 | req->out.args[0].size; | |
637 | } | |
638 | ||
639 | fuse_aio_complete(io, req->out.h.error, pos); | |
640 | } | |
641 | ||
642 | static size_t fuse_async_req_send(struct fuse_conn *fc, struct fuse_req *req, | |
643 | size_t num_bytes, struct fuse_io_priv *io) | |
644 | { | |
645 | spin_lock(&io->lock); | |
744742d6 | 646 | kref_get(&io->refcnt); |
01e9d11a MP |
647 | io->size += num_bytes; |
648 | io->reqs++; | |
649 | spin_unlock(&io->lock); | |
650 | ||
651 | req->io = io; | |
652 | req->end = fuse_aio_complete_req; | |
653 | ||
36cf66ed | 654 | __fuse_get_request(req); |
01e9d11a MP |
655 | fuse_request_send_background(fc, req); |
656 | ||
657 | return num_bytes; | |
658 | } | |
659 | ||
36cf66ed | 660 | static size_t fuse_send_read(struct fuse_req *req, struct fuse_io_priv *io, |
2106cb18 | 661 | loff_t pos, size_t count, fl_owner_t owner) |
04730fef | 662 | { |
e1c0eecb | 663 | struct file *file = io->iocb->ki_filp; |
2106cb18 MS |
664 | struct fuse_file *ff = file->private_data; |
665 | struct fuse_conn *fc = ff->fc; | |
f3332114 | 666 | |
2106cb18 | 667 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
f3332114 | 668 | if (owner != NULL) { |
5c5c5e51 | 669 | struct fuse_read_in *inarg = &req->misc.read.in; |
f3332114 MS |
670 | |
671 | inarg->read_flags |= FUSE_READ_LOCKOWNER; | |
672 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
673 | } | |
36cf66ed MP |
674 | |
675 | if (io->async) | |
676 | return fuse_async_req_send(fc, req, count, io); | |
677 | ||
b93f858a | 678 | fuse_request_send(fc, req); |
361b1eb5 | 679 | return req->out.args[0].size; |
04730fef MS |
680 | } |
681 | ||
5c5c5e51 MS |
682 | static void fuse_read_update_size(struct inode *inode, loff_t size, |
683 | u64 attr_ver) | |
684 | { | |
685 | struct fuse_conn *fc = get_fuse_conn(inode); | |
686 | struct fuse_inode *fi = get_fuse_inode(inode); | |
687 | ||
f15ecfef | 688 | spin_lock(&fi->lock); |
06a7c3c2 MP |
689 | if (attr_ver == fi->attr_version && size < inode->i_size && |
690 | !test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
4510d86f | 691 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
5c5c5e51 MS |
692 | i_size_write(inode, size); |
693 | } | |
f15ecfef | 694 | spin_unlock(&fi->lock); |
5c5c5e51 MS |
695 | } |
696 | ||
a92adc82 PE |
697 | static void fuse_short_read(struct fuse_req *req, struct inode *inode, |
698 | u64 attr_ver) | |
699 | { | |
700 | size_t num_read = req->out.args[0].size; | |
8373200b PE |
701 | struct fuse_conn *fc = get_fuse_conn(inode); |
702 | ||
703 | if (fc->writeback_cache) { | |
704 | /* | |
705 | * A hole in a file. Some data after the hole are in page cache, | |
706 | * but have not reached the client fs yet. So, the hole is not | |
707 | * present there. | |
708 | */ | |
709 | int i; | |
09cbfeaf KS |
710 | int start_idx = num_read >> PAGE_SHIFT; |
711 | size_t off = num_read & (PAGE_SIZE - 1); | |
a92adc82 | 712 | |
8373200b | 713 | for (i = start_idx; i < req->num_pages; i++) { |
09cbfeaf | 714 | zero_user_segment(req->pages[i], off, PAGE_SIZE); |
8373200b PE |
715 | off = 0; |
716 | } | |
717 | } else { | |
718 | loff_t pos = page_offset(req->pages[0]) + num_read; | |
719 | fuse_read_update_size(inode, pos, attr_ver); | |
720 | } | |
a92adc82 PE |
721 | } |
722 | ||
482fce55 | 723 | static int fuse_do_readpage(struct file *file, struct page *page) |
b6aeaded | 724 | { |
e1c0eecb MS |
725 | struct kiocb iocb; |
726 | struct fuse_io_priv io; | |
b6aeaded MS |
727 | struct inode *inode = page->mapping->host; |
728 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 | 729 | struct fuse_req *req; |
5c5c5e51 MS |
730 | size_t num_read; |
731 | loff_t pos = page_offset(page); | |
09cbfeaf | 732 | size_t count = PAGE_SIZE; |
5c5c5e51 | 733 | u64 attr_ver; |
248d86e8 MS |
734 | int err; |
735 | ||
3be5a52b | 736 | /* |
25985edc | 737 | * Page writeback can extend beyond the lifetime of the |
3be5a52b MS |
738 | * page-cache page, so make sure we read a properly synced |
739 | * page. | |
740 | */ | |
741 | fuse_wait_on_page_writeback(inode, page->index); | |
742 | ||
b111c8c0 | 743 | req = fuse_get_req(fc, 1); |
ce1d5a49 | 744 | if (IS_ERR(req)) |
482fce55 | 745 | return PTR_ERR(req); |
b6aeaded | 746 | |
5c5c5e51 MS |
747 | attr_ver = fuse_get_attr_version(fc); |
748 | ||
b6aeaded | 749 | req->out.page_zeroing = 1; |
f4975c67 | 750 | req->out.argpages = 1; |
b6aeaded MS |
751 | req->num_pages = 1; |
752 | req->pages[0] = page; | |
85f40aec | 753 | req->page_descs[0].length = count; |
e1c0eecb MS |
754 | init_sync_kiocb(&iocb, file); |
755 | io = (struct fuse_io_priv) FUSE_IO_PRIV_SYNC(&iocb); | |
36cf66ed | 756 | num_read = fuse_send_read(req, &io, pos, count, NULL); |
b6aeaded | 757 | err = req->out.h.error; |
5c5c5e51 MS |
758 | |
759 | if (!err) { | |
760 | /* | |
761 | * Short read means EOF. If file size is larger, truncate it | |
762 | */ | |
763 | if (num_read < count) | |
a92adc82 | 764 | fuse_short_read(req, inode, attr_ver); |
5c5c5e51 | 765 | |
b6aeaded | 766 | SetPageUptodate(page); |
5c5c5e51 MS |
767 | } |
768 | ||
a92adc82 | 769 | fuse_put_request(fc, req); |
482fce55 MP |
770 | |
771 | return err; | |
772 | } | |
773 | ||
774 | static int fuse_readpage(struct file *file, struct page *page) | |
775 | { | |
776 | struct inode *inode = page->mapping->host; | |
777 | int err; | |
778 | ||
779 | err = -EIO; | |
780 | if (is_bad_inode(inode)) | |
781 | goto out; | |
782 | ||
783 | err = fuse_do_readpage(file, page); | |
451418fc | 784 | fuse_invalidate_atime(inode); |
b6aeaded MS |
785 | out: |
786 | unlock_page(page); | |
787 | return err; | |
788 | } | |
789 | ||
c1aa96a5 | 790 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 791 | { |
c1aa96a5 | 792 | int i; |
5c5c5e51 MS |
793 | size_t count = req->misc.read.in.size; |
794 | size_t num_read = req->out.args[0].size; | |
ce534fb0 | 795 | struct address_space *mapping = NULL; |
c1aa96a5 | 796 | |
ce534fb0 MS |
797 | for (i = 0; mapping == NULL && i < req->num_pages; i++) |
798 | mapping = req->pages[i]->mapping; | |
5c5c5e51 | 799 | |
ce534fb0 MS |
800 | if (mapping) { |
801 | struct inode *inode = mapping->host; | |
802 | ||
803 | /* | |
804 | * Short read means EOF. If file size is larger, truncate it | |
805 | */ | |
a92adc82 PE |
806 | if (!req->out.h.error && num_read < count) |
807 | fuse_short_read(req, inode, req->misc.read.attr_ver); | |
ce534fb0 | 808 | |
451418fc | 809 | fuse_invalidate_atime(inode); |
ce534fb0 | 810 | } |
c1aa96a5 | 811 | |
db50b96c MS |
812 | for (i = 0; i < req->num_pages; i++) { |
813 | struct page *page = req->pages[i]; | |
814 | if (!req->out.h.error) | |
815 | SetPageUptodate(page); | |
c1aa96a5 MS |
816 | else |
817 | SetPageError(page); | |
db50b96c | 818 | unlock_page(page); |
09cbfeaf | 819 | put_page(page); |
db50b96c | 820 | } |
c756e0a4 | 821 | if (req->ff) |
2e64ff15 | 822 | fuse_file_put(req->ff, false, false); |
c1aa96a5 MS |
823 | } |
824 | ||
2106cb18 | 825 | static void fuse_send_readpages(struct fuse_req *req, struct file *file) |
c1aa96a5 | 826 | { |
2106cb18 MS |
827 | struct fuse_file *ff = file->private_data; |
828 | struct fuse_conn *fc = ff->fc; | |
c1aa96a5 | 829 | loff_t pos = page_offset(req->pages[0]); |
09cbfeaf | 830 | size_t count = req->num_pages << PAGE_SHIFT; |
f4975c67 MS |
831 | |
832 | req->out.argpages = 1; | |
c1aa96a5 | 833 | req->out.page_zeroing = 1; |
ce534fb0 | 834 | req->out.page_replace = 1; |
2106cb18 | 835 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
5c5c5e51 | 836 | req->misc.read.attr_ver = fuse_get_attr_version(fc); |
9cd68455 | 837 | if (fc->async_read) { |
c756e0a4 | 838 | req->ff = fuse_file_get(ff); |
9cd68455 | 839 | req->end = fuse_readpages_end; |
b93f858a | 840 | fuse_request_send_background(fc, req); |
9cd68455 | 841 | } else { |
b93f858a | 842 | fuse_request_send(fc, req); |
9cd68455 | 843 | fuse_readpages_end(fc, req); |
e9bb09dd | 844 | fuse_put_request(fc, req); |
9cd68455 | 845 | } |
db50b96c MS |
846 | } |
847 | ||
c756e0a4 | 848 | struct fuse_fill_data { |
db50b96c | 849 | struct fuse_req *req; |
a6643094 | 850 | struct file *file; |
db50b96c | 851 | struct inode *inode; |
f8dbdf81 | 852 | unsigned nr_pages; |
db50b96c MS |
853 | }; |
854 | ||
855 | static int fuse_readpages_fill(void *_data, struct page *page) | |
856 | { | |
c756e0a4 | 857 | struct fuse_fill_data *data = _data; |
db50b96c MS |
858 | struct fuse_req *req = data->req; |
859 | struct inode *inode = data->inode; | |
860 | struct fuse_conn *fc = get_fuse_conn(inode); | |
861 | ||
3be5a52b MS |
862 | fuse_wait_on_page_writeback(inode, page->index); |
863 | ||
db50b96c | 864 | if (req->num_pages && |
5da784cc | 865 | (req->num_pages == fc->max_pages || |
09cbfeaf | 866 | (req->num_pages + 1) * PAGE_SIZE > fc->max_read || |
db50b96c | 867 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { |
5da784cc CS |
868 | unsigned int nr_alloc = min_t(unsigned int, data->nr_pages, |
869 | fc->max_pages); | |
2106cb18 | 870 | fuse_send_readpages(req, data->file); |
8b41e671 MP |
871 | if (fc->async_read) |
872 | req = fuse_get_req_for_background(fc, nr_alloc); | |
873 | else | |
874 | req = fuse_get_req(fc, nr_alloc); | |
875 | ||
876 | data->req = req; | |
ce1d5a49 | 877 | if (IS_ERR(req)) { |
db50b96c | 878 | unlock_page(page); |
ce1d5a49 | 879 | return PTR_ERR(req); |
db50b96c | 880 | } |
db50b96c | 881 | } |
f8dbdf81 MP |
882 | |
883 | if (WARN_ON(req->num_pages >= req->max_pages)) { | |
109728cc | 884 | unlock_page(page); |
f8dbdf81 MP |
885 | fuse_put_request(fc, req); |
886 | return -EIO; | |
887 | } | |
888 | ||
09cbfeaf | 889 | get_page(page); |
db50b96c | 890 | req->pages[req->num_pages] = page; |
85f40aec | 891 | req->page_descs[req->num_pages].length = PAGE_SIZE; |
1729a16c | 892 | req->num_pages++; |
f8dbdf81 | 893 | data->nr_pages--; |
db50b96c MS |
894 | return 0; |
895 | } | |
896 | ||
897 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
898 | struct list_head *pages, unsigned nr_pages) | |
899 | { | |
900 | struct inode *inode = mapping->host; | |
901 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 902 | struct fuse_fill_data data; |
db50b96c | 903 | int err; |
5da784cc | 904 | unsigned int nr_alloc = min_t(unsigned int, nr_pages, fc->max_pages); |
248d86e8 | 905 | |
1d7ea732 | 906 | err = -EIO; |
248d86e8 | 907 | if (is_bad_inode(inode)) |
2e990021 | 908 | goto out; |
248d86e8 | 909 | |
a6643094 | 910 | data.file = file; |
db50b96c | 911 | data.inode = inode; |
8b41e671 MP |
912 | if (fc->async_read) |
913 | data.req = fuse_get_req_for_background(fc, nr_alloc); | |
914 | else | |
915 | data.req = fuse_get_req(fc, nr_alloc); | |
f8dbdf81 | 916 | data.nr_pages = nr_pages; |
1d7ea732 | 917 | err = PTR_ERR(data.req); |
ce1d5a49 | 918 | if (IS_ERR(data.req)) |
2e990021 | 919 | goto out; |
db50b96c MS |
920 | |
921 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
922 | if (!err) { |
923 | if (data.req->num_pages) | |
2106cb18 | 924 | fuse_send_readpages(data.req, file); |
d3406ffa MS |
925 | else |
926 | fuse_put_request(fc, data.req); | |
927 | } | |
2e990021 | 928 | out: |
1d7ea732 | 929 | return err; |
db50b96c MS |
930 | } |
931 | ||
37c20f16 | 932 | static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
bcb4be80 MS |
933 | { |
934 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
a8894274 | 935 | struct fuse_conn *fc = get_fuse_conn(inode); |
bcb4be80 | 936 | |
a8894274 BF |
937 | /* |
938 | * In auto invalidate mode, always update attributes on read. | |
939 | * Otherwise, only update if we attempt to read past EOF (to ensure | |
940 | * i_size is up to date). | |
941 | */ | |
942 | if (fc->auto_inval_data || | |
37c20f16 | 943 | (iocb->ki_pos + iov_iter_count(to) > i_size_read(inode))) { |
bcb4be80 | 944 | int err; |
5b97eeac | 945 | err = fuse_update_attributes(inode, iocb->ki_filp); |
bcb4be80 MS |
946 | if (err) |
947 | return err; | |
948 | } | |
949 | ||
37c20f16 | 950 | return generic_file_read_iter(iocb, to); |
bcb4be80 MS |
951 | } |
952 | ||
2d698b07 | 953 | static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, |
2106cb18 | 954 | loff_t pos, size_t count) |
b6aeaded | 955 | { |
b25e82e5 MS |
956 | struct fuse_write_in *inarg = &req->misc.write.in; |
957 | struct fuse_write_out *outarg = &req->misc.write.out; | |
b6aeaded | 958 | |
b25e82e5 MS |
959 | inarg->fh = ff->fh; |
960 | inarg->offset = pos; | |
961 | inarg->size = count; | |
b6aeaded | 962 | req->in.h.opcode = FUSE_WRITE; |
2106cb18 | 963 | req->in.h.nodeid = ff->nodeid; |
b6aeaded | 964 | req->in.numargs = 2; |
2106cb18 | 965 | if (ff->fc->minor < 9) |
f3332114 MS |
966 | req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; |
967 | else | |
968 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
b25e82e5 | 969 | req->in.args[0].value = inarg; |
b6aeaded MS |
970 | req->in.args[1].size = count; |
971 | req->out.numargs = 1; | |
972 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
b25e82e5 MS |
973 | req->out.args[0].value = outarg; |
974 | } | |
975 | ||
36cf66ed | 976 | static size_t fuse_send_write(struct fuse_req *req, struct fuse_io_priv *io, |
2106cb18 | 977 | loff_t pos, size_t count, fl_owner_t owner) |
b25e82e5 | 978 | { |
e1c0eecb MS |
979 | struct kiocb *iocb = io->iocb; |
980 | struct file *file = iocb->ki_filp; | |
2106cb18 MS |
981 | struct fuse_file *ff = file->private_data; |
982 | struct fuse_conn *fc = ff->fc; | |
2d698b07 MS |
983 | struct fuse_write_in *inarg = &req->misc.write.in; |
984 | ||
2106cb18 | 985 | fuse_write_fill(req, ff, pos, count); |
2d698b07 | 986 | inarg->flags = file->f_flags; |
e1c0eecb MS |
987 | if (iocb->ki_flags & IOCB_DSYNC) |
988 | inarg->flags |= O_DSYNC; | |
989 | if (iocb->ki_flags & IOCB_SYNC) | |
990 | inarg->flags |= O_SYNC; | |
f3332114 | 991 | if (owner != NULL) { |
f3332114 MS |
992 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; |
993 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
994 | } | |
36cf66ed MP |
995 | |
996 | if (io->async) | |
997 | return fuse_async_req_send(fc, req, count, io); | |
998 | ||
b93f858a | 999 | fuse_request_send(fc, req); |
b25e82e5 | 1000 | return req->misc.write.out.size; |
b6aeaded MS |
1001 | } |
1002 | ||
b0aa7606 | 1003 | bool fuse_write_update_size(struct inode *inode, loff_t pos) |
854512ec MS |
1004 | { |
1005 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1006 | struct fuse_inode *fi = get_fuse_inode(inode); | |
b0aa7606 | 1007 | bool ret = false; |
854512ec | 1008 | |
f15ecfef | 1009 | spin_lock(&fi->lock); |
4510d86f | 1010 | fi->attr_version = atomic64_inc_return(&fc->attr_version); |
b0aa7606 | 1011 | if (pos > inode->i_size) { |
854512ec | 1012 | i_size_write(inode, pos); |
b0aa7606 MP |
1013 | ret = true; |
1014 | } | |
f15ecfef | 1015 | spin_unlock(&fi->lock); |
b0aa7606 MP |
1016 | |
1017 | return ret; | |
854512ec MS |
1018 | } |
1019 | ||
e1c0eecb | 1020 | static size_t fuse_send_write_pages(struct fuse_req *req, struct kiocb *iocb, |
ea9b9907 NP |
1021 | struct inode *inode, loff_t pos, |
1022 | size_t count) | |
1023 | { | |
1024 | size_t res; | |
1025 | unsigned offset; | |
1026 | unsigned i; | |
e1c0eecb | 1027 | struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb); |
ea9b9907 NP |
1028 | |
1029 | for (i = 0; i < req->num_pages; i++) | |
1030 | fuse_wait_on_page_writeback(inode, req->pages[i]->index); | |
1031 | ||
36cf66ed | 1032 | res = fuse_send_write(req, &io, pos, count, NULL); |
ea9b9907 | 1033 | |
b2430d75 | 1034 | offset = req->page_descs[0].offset; |
ea9b9907 NP |
1035 | count = res; |
1036 | for (i = 0; i < req->num_pages; i++) { | |
1037 | struct page *page = req->pages[i]; | |
1038 | ||
09cbfeaf | 1039 | if (!req->out.h.error && !offset && count >= PAGE_SIZE) |
ea9b9907 NP |
1040 | SetPageUptodate(page); |
1041 | ||
09cbfeaf KS |
1042 | if (count > PAGE_SIZE - offset) |
1043 | count -= PAGE_SIZE - offset; | |
ea9b9907 NP |
1044 | else |
1045 | count = 0; | |
1046 | offset = 0; | |
1047 | ||
1048 | unlock_page(page); | |
09cbfeaf | 1049 | put_page(page); |
ea9b9907 NP |
1050 | } |
1051 | ||
1052 | return res; | |
1053 | } | |
1054 | ||
1055 | static ssize_t fuse_fill_write_pages(struct fuse_req *req, | |
1056 | struct address_space *mapping, | |
1057 | struct iov_iter *ii, loff_t pos) | |
1058 | { | |
1059 | struct fuse_conn *fc = get_fuse_conn(mapping->host); | |
09cbfeaf | 1060 | unsigned offset = pos & (PAGE_SIZE - 1); |
ea9b9907 NP |
1061 | size_t count = 0; |
1062 | int err; | |
1063 | ||
f4975c67 | 1064 | req->in.argpages = 1; |
b2430d75 | 1065 | req->page_descs[0].offset = offset; |
ea9b9907 NP |
1066 | |
1067 | do { | |
1068 | size_t tmp; | |
1069 | struct page *page; | |
09cbfeaf KS |
1070 | pgoff_t index = pos >> PAGE_SHIFT; |
1071 | size_t bytes = min_t(size_t, PAGE_SIZE - offset, | |
ea9b9907 NP |
1072 | iov_iter_count(ii)); |
1073 | ||
1074 | bytes = min_t(size_t, bytes, fc->max_write - count); | |
1075 | ||
1076 | again: | |
1077 | err = -EFAULT; | |
1078 | if (iov_iter_fault_in_readable(ii, bytes)) | |
1079 | break; | |
1080 | ||
1081 | err = -ENOMEM; | |
54566b2c | 1082 | page = grab_cache_page_write_begin(mapping, index, 0); |
ea9b9907 NP |
1083 | if (!page) |
1084 | break; | |
1085 | ||
931e80e4 | 1086 | if (mapping_writably_mapped(mapping)) |
1087 | flush_dcache_page(page); | |
1088 | ||
ea9b9907 | 1089 | tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); |
ea9b9907 NP |
1090 | flush_dcache_page(page); |
1091 | ||
3ca8138f | 1092 | iov_iter_advance(ii, tmp); |
ea9b9907 NP |
1093 | if (!tmp) { |
1094 | unlock_page(page); | |
09cbfeaf | 1095 | put_page(page); |
ea9b9907 NP |
1096 | bytes = min(bytes, iov_iter_single_seg_count(ii)); |
1097 | goto again; | |
1098 | } | |
1099 | ||
1100 | err = 0; | |
1101 | req->pages[req->num_pages] = page; | |
85f40aec | 1102 | req->page_descs[req->num_pages].length = tmp; |
ea9b9907 NP |
1103 | req->num_pages++; |
1104 | ||
ea9b9907 NP |
1105 | count += tmp; |
1106 | pos += tmp; | |
1107 | offset += tmp; | |
09cbfeaf | 1108 | if (offset == PAGE_SIZE) |
ea9b9907 NP |
1109 | offset = 0; |
1110 | ||
78bb6cb9 MS |
1111 | if (!fc->big_writes) |
1112 | break; | |
ea9b9907 | 1113 | } while (iov_iter_count(ii) && count < fc->max_write && |
d07f09f5 | 1114 | req->num_pages < req->max_pages && offset == 0); |
ea9b9907 NP |
1115 | |
1116 | return count > 0 ? count : err; | |
1117 | } | |
1118 | ||
5da784cc CS |
1119 | static inline unsigned int fuse_wr_pages(loff_t pos, size_t len, |
1120 | unsigned int max_pages) | |
d07f09f5 | 1121 | { |
5da784cc | 1122 | return min_t(unsigned int, |
09cbfeaf KS |
1123 | ((pos + len - 1) >> PAGE_SHIFT) - |
1124 | (pos >> PAGE_SHIFT) + 1, | |
5da784cc | 1125 | max_pages); |
d07f09f5 MP |
1126 | } |
1127 | ||
e1c0eecb | 1128 | static ssize_t fuse_perform_write(struct kiocb *iocb, |
ea9b9907 NP |
1129 | struct address_space *mapping, |
1130 | struct iov_iter *ii, loff_t pos) | |
1131 | { | |
1132 | struct inode *inode = mapping->host; | |
1133 | struct fuse_conn *fc = get_fuse_conn(inode); | |
06a7c3c2 | 1134 | struct fuse_inode *fi = get_fuse_inode(inode); |
ea9b9907 NP |
1135 | int err = 0; |
1136 | ssize_t res = 0; | |
1137 | ||
1138 | if (is_bad_inode(inode)) | |
1139 | return -EIO; | |
1140 | ||
06a7c3c2 MP |
1141 | if (inode->i_size < pos + iov_iter_count(ii)) |
1142 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
1143 | ||
ea9b9907 NP |
1144 | do { |
1145 | struct fuse_req *req; | |
1146 | ssize_t count; | |
5da784cc CS |
1147 | unsigned int nr_pages = fuse_wr_pages(pos, iov_iter_count(ii), |
1148 | fc->max_pages); | |
ea9b9907 | 1149 | |
d07f09f5 | 1150 | req = fuse_get_req(fc, nr_pages); |
ea9b9907 NP |
1151 | if (IS_ERR(req)) { |
1152 | err = PTR_ERR(req); | |
1153 | break; | |
1154 | } | |
1155 | ||
1156 | count = fuse_fill_write_pages(req, mapping, ii, pos); | |
1157 | if (count <= 0) { | |
1158 | err = count; | |
1159 | } else { | |
1160 | size_t num_written; | |
1161 | ||
e1c0eecb | 1162 | num_written = fuse_send_write_pages(req, iocb, inode, |
ea9b9907 NP |
1163 | pos, count); |
1164 | err = req->out.h.error; | |
1165 | if (!err) { | |
1166 | res += num_written; | |
1167 | pos += num_written; | |
1168 | ||
1169 | /* break out of the loop on short write */ | |
1170 | if (num_written != count) | |
1171 | err = -EIO; | |
1172 | } | |
1173 | } | |
1174 | fuse_put_request(fc, req); | |
1175 | } while (!err && iov_iter_count(ii)); | |
1176 | ||
1177 | if (res > 0) | |
1178 | fuse_write_update_size(inode, pos); | |
1179 | ||
06a7c3c2 | 1180 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
ea9b9907 NP |
1181 | fuse_invalidate_attr(inode); |
1182 | ||
1183 | return res > 0 ? res : err; | |
1184 | } | |
1185 | ||
84c3d55c | 1186 | static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ea9b9907 NP |
1187 | { |
1188 | struct file *file = iocb->ki_filp; | |
1189 | struct address_space *mapping = file->f_mapping; | |
ea9b9907 | 1190 | ssize_t written = 0; |
4273b793 | 1191 | ssize_t written_buffered = 0; |
ea9b9907 NP |
1192 | struct inode *inode = mapping->host; |
1193 | ssize_t err; | |
4273b793 | 1194 | loff_t endbyte = 0; |
ea9b9907 | 1195 | |
4d99ff8f PE |
1196 | if (get_fuse_conn(inode)->writeback_cache) { |
1197 | /* Update size (EOF optimization) and mode (SUID clearing) */ | |
5b97eeac | 1198 | err = fuse_update_attributes(mapping->host, file); |
4d99ff8f PE |
1199 | if (err) |
1200 | return err; | |
1201 | ||
84c3d55c | 1202 | return generic_file_write_iter(iocb, from); |
4d99ff8f PE |
1203 | } |
1204 | ||
5955102c | 1205 | inode_lock(inode); |
ea9b9907 NP |
1206 | |
1207 | /* We can write back this queue in page reclaim */ | |
de1414a6 | 1208 | current->backing_dev_info = inode_to_bdi(inode); |
ea9b9907 | 1209 | |
3309dd04 AV |
1210 | err = generic_write_checks(iocb, from); |
1211 | if (err <= 0) | |
ea9b9907 NP |
1212 | goto out; |
1213 | ||
5fa8e0a1 | 1214 | err = file_remove_privs(file); |
ea9b9907 NP |
1215 | if (err) |
1216 | goto out; | |
1217 | ||
c3b2da31 JB |
1218 | err = file_update_time(file); |
1219 | if (err) | |
1220 | goto out; | |
ea9b9907 | 1221 | |
2ba48ce5 | 1222 | if (iocb->ki_flags & IOCB_DIRECT) { |
3309dd04 | 1223 | loff_t pos = iocb->ki_pos; |
1af5bb49 | 1224 | written = generic_file_direct_write(iocb, from); |
84c3d55c | 1225 | if (written < 0 || !iov_iter_count(from)) |
4273b793 AA |
1226 | goto out; |
1227 | ||
1228 | pos += written; | |
ea9b9907 | 1229 | |
e1c0eecb | 1230 | written_buffered = fuse_perform_write(iocb, mapping, from, pos); |
4273b793 AA |
1231 | if (written_buffered < 0) { |
1232 | err = written_buffered; | |
1233 | goto out; | |
1234 | } | |
1235 | endbyte = pos + written_buffered - 1; | |
1236 | ||
1237 | err = filemap_write_and_wait_range(file->f_mapping, pos, | |
1238 | endbyte); | |
1239 | if (err) | |
1240 | goto out; | |
1241 | ||
1242 | invalidate_mapping_pages(file->f_mapping, | |
09cbfeaf KS |
1243 | pos >> PAGE_SHIFT, |
1244 | endbyte >> PAGE_SHIFT); | |
4273b793 AA |
1245 | |
1246 | written += written_buffered; | |
1247 | iocb->ki_pos = pos + written_buffered; | |
1248 | } else { | |
e1c0eecb | 1249 | written = fuse_perform_write(iocb, mapping, from, iocb->ki_pos); |
4273b793 | 1250 | if (written >= 0) |
3309dd04 | 1251 | iocb->ki_pos += written; |
4273b793 | 1252 | } |
ea9b9907 NP |
1253 | out: |
1254 | current->backing_dev_info = NULL; | |
5955102c | 1255 | inode_unlock(inode); |
e1c0eecb MS |
1256 | if (written > 0) |
1257 | written = generic_write_sync(iocb, written); | |
ea9b9907 NP |
1258 | |
1259 | return written ? written : err; | |
1260 | } | |
1261 | ||
7c190c8b MP |
1262 | static inline void fuse_page_descs_length_init(struct fuse_req *req, |
1263 | unsigned index, unsigned nr_pages) | |
85f40aec MP |
1264 | { |
1265 | int i; | |
1266 | ||
7c190c8b | 1267 | for (i = index; i < index + nr_pages; i++) |
85f40aec MP |
1268 | req->page_descs[i].length = PAGE_SIZE - |
1269 | req->page_descs[i].offset; | |
1270 | } | |
1271 | ||
7c190c8b MP |
1272 | static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii) |
1273 | { | |
1274 | return (unsigned long)ii->iov->iov_base + ii->iov_offset; | |
1275 | } | |
1276 | ||
1277 | static inline size_t fuse_get_frag_size(const struct iov_iter *ii, | |
1278 | size_t max_size) | |
1279 | { | |
1280 | return min(iov_iter_single_seg_count(ii), max_size); | |
1281 | } | |
1282 | ||
b98d023a | 1283 | static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii, |
ce60a2f1 | 1284 | size_t *nbytesp, int write) |
413ef8cb | 1285 | { |
7c190c8b | 1286 | size_t nbytes = 0; /* # bytes already packed in req */ |
742f9927 | 1287 | ssize_t ret = 0; |
b98d023a | 1288 | |
f4975c67 | 1289 | /* Special case for kernel I/O: can copy directly into the buffer */ |
00e23707 | 1290 | if (iov_iter_is_kvec(ii)) { |
7c190c8b MP |
1291 | unsigned long user_addr = fuse_get_user_addr(ii); |
1292 | size_t frag_size = fuse_get_frag_size(ii, *nbytesp); | |
1293 | ||
f4975c67 MS |
1294 | if (write) |
1295 | req->in.args[1].value = (void *) user_addr; | |
1296 | else | |
1297 | req->out.args[0].value = (void *) user_addr; | |
1298 | ||
b98d023a MP |
1299 | iov_iter_advance(ii, frag_size); |
1300 | *nbytesp = frag_size; | |
f4975c67 MS |
1301 | return 0; |
1302 | } | |
413ef8cb | 1303 | |
5565a9d8 | 1304 | while (nbytes < *nbytesp && req->num_pages < req->max_pages) { |
7c190c8b | 1305 | unsigned npages; |
f67da30c | 1306 | size_t start; |
742f9927 | 1307 | ret = iov_iter_get_pages(ii, &req->pages[req->num_pages], |
2c80929c | 1308 | *nbytesp - nbytes, |
c7f3888a AV |
1309 | req->max_pages - req->num_pages, |
1310 | &start); | |
7c190c8b | 1311 | if (ret < 0) |
742f9927 | 1312 | break; |
7c190c8b | 1313 | |
c9c37e2e AV |
1314 | iov_iter_advance(ii, ret); |
1315 | nbytes += ret; | |
7c190c8b | 1316 | |
c9c37e2e AV |
1317 | ret += start; |
1318 | npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE; | |
7c190c8b | 1319 | |
c9c37e2e | 1320 | req->page_descs[req->num_pages].offset = start; |
7c190c8b MP |
1321 | fuse_page_descs_length_init(req, req->num_pages, npages); |
1322 | ||
1323 | req->num_pages += npages; | |
1324 | req->page_descs[req->num_pages - 1].length -= | |
c9c37e2e | 1325 | (PAGE_SIZE - ret) & (PAGE_SIZE - 1); |
7c190c8b | 1326 | } |
f4975c67 MS |
1327 | |
1328 | if (write) | |
1329 | req->in.argpages = 1; | |
1330 | else | |
1331 | req->out.argpages = 1; | |
1332 | ||
7c190c8b | 1333 | *nbytesp = nbytes; |
f4975c67 | 1334 | |
2c932d4c | 1335 | return ret < 0 ? ret : 0; |
413ef8cb MS |
1336 | } |
1337 | ||
d22a943f AV |
1338 | ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, |
1339 | loff_t *ppos, int flags) | |
413ef8cb | 1340 | { |
ea8cd333 PE |
1341 | int write = flags & FUSE_DIO_WRITE; |
1342 | int cuse = flags & FUSE_DIO_CUSE; | |
e1c0eecb | 1343 | struct file *file = io->iocb->ki_filp; |
ea8cd333 | 1344 | struct inode *inode = file->f_mapping->host; |
2106cb18 MS |
1345 | struct fuse_file *ff = file->private_data; |
1346 | struct fuse_conn *fc = ff->fc; | |
413ef8cb MS |
1347 | size_t nmax = write ? fc->max_write : fc->max_read; |
1348 | loff_t pos = *ppos; | |
d22a943f | 1349 | size_t count = iov_iter_count(iter); |
09cbfeaf KS |
1350 | pgoff_t idx_from = pos >> PAGE_SHIFT; |
1351 | pgoff_t idx_to = (pos + count - 1) >> PAGE_SHIFT; | |
413ef8cb | 1352 | ssize_t res = 0; |
248d86e8 | 1353 | struct fuse_req *req; |
742f9927 | 1354 | int err = 0; |
248d86e8 | 1355 | |
de82b923 | 1356 | if (io->async) |
5da784cc CS |
1357 | req = fuse_get_req_for_background(fc, iov_iter_npages(iter, |
1358 | fc->max_pages)); | |
de82b923 | 1359 | else |
5da784cc | 1360 | req = fuse_get_req(fc, iov_iter_npages(iter, fc->max_pages)); |
ce1d5a49 MS |
1361 | if (IS_ERR(req)) |
1362 | return PTR_ERR(req); | |
413ef8cb | 1363 | |
ea8cd333 PE |
1364 | if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) { |
1365 | if (!write) | |
5955102c | 1366 | inode_lock(inode); |
ea8cd333 PE |
1367 | fuse_sync_writes(inode); |
1368 | if (!write) | |
5955102c | 1369 | inode_unlock(inode); |
ea8cd333 PE |
1370 | } |
1371 | ||
61c12b49 | 1372 | io->should_dirty = !write && iter_is_iovec(iter); |
413ef8cb | 1373 | while (count) { |
413ef8cb | 1374 | size_t nres; |
2106cb18 | 1375 | fl_owner_t owner = current->files; |
f4975c67 | 1376 | size_t nbytes = min(count, nmax); |
742f9927 AS |
1377 | err = fuse_get_user_pages(req, iter, &nbytes, write); |
1378 | if (err && !nbytes) | |
413ef8cb | 1379 | break; |
f4975c67 | 1380 | |
413ef8cb | 1381 | if (write) |
36cf66ed | 1382 | nres = fuse_send_write(req, io, pos, nbytes, owner); |
413ef8cb | 1383 | else |
36cf66ed | 1384 | nres = fuse_send_read(req, io, pos, nbytes, owner); |
2106cb18 | 1385 | |
36cf66ed | 1386 | if (!io->async) |
61c12b49 | 1387 | fuse_release_user_pages(req, io->should_dirty); |
413ef8cb | 1388 | if (req->out.h.error) { |
742f9927 | 1389 | err = req->out.h.error; |
413ef8cb MS |
1390 | break; |
1391 | } else if (nres > nbytes) { | |
742f9927 AS |
1392 | res = 0; |
1393 | err = -EIO; | |
413ef8cb MS |
1394 | break; |
1395 | } | |
1396 | count -= nres; | |
1397 | res += nres; | |
1398 | pos += nres; | |
413ef8cb MS |
1399 | if (nres != nbytes) |
1400 | break; | |
56cf34ff MS |
1401 | if (count) { |
1402 | fuse_put_request(fc, req); | |
de82b923 BF |
1403 | if (io->async) |
1404 | req = fuse_get_req_for_background(fc, | |
5da784cc | 1405 | iov_iter_npages(iter, fc->max_pages)); |
de82b923 | 1406 | else |
5da784cc CS |
1407 | req = fuse_get_req(fc, iov_iter_npages(iter, |
1408 | fc->max_pages)); | |
56cf34ff MS |
1409 | if (IS_ERR(req)) |
1410 | break; | |
1411 | } | |
413ef8cb | 1412 | } |
f60311d5 AA |
1413 | if (!IS_ERR(req)) |
1414 | fuse_put_request(fc, req); | |
d09cb9d7 | 1415 | if (res > 0) |
413ef8cb | 1416 | *ppos = pos; |
413ef8cb | 1417 | |
742f9927 | 1418 | return res > 0 ? res : err; |
413ef8cb | 1419 | } |
08cbf542 | 1420 | EXPORT_SYMBOL_GPL(fuse_direct_io); |
413ef8cb | 1421 | |
36cf66ed | 1422 | static ssize_t __fuse_direct_read(struct fuse_io_priv *io, |
d22a943f AV |
1423 | struct iov_iter *iter, |
1424 | loff_t *ppos) | |
413ef8cb | 1425 | { |
d09cb9d7 | 1426 | ssize_t res; |
e1c0eecb | 1427 | struct inode *inode = file_inode(io->iocb->ki_filp); |
d09cb9d7 MS |
1428 | |
1429 | if (is_bad_inode(inode)) | |
1430 | return -EIO; | |
1431 | ||
d22a943f | 1432 | res = fuse_direct_io(io, iter, ppos, 0); |
d09cb9d7 | 1433 | |
9a2eb24d | 1434 | fuse_invalidate_atime(inode); |
d09cb9d7 MS |
1435 | |
1436 | return res; | |
413ef8cb MS |
1437 | } |
1438 | ||
23c94e1c MR |
1439 | static ssize_t fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter); |
1440 | ||
15316263 | 1441 | static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to) |
b98d023a | 1442 | { |
23c94e1c MR |
1443 | ssize_t res; |
1444 | ||
1445 | if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) { | |
1446 | struct file *file = iocb->ki_filp; | |
1447 | ||
1448 | if (is_bad_inode(file_inode(file))) | |
1449 | return -EIO; | |
1450 | ||
1451 | res = fuse_direct_IO(iocb, to); | |
1452 | } else { | |
1453 | struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb); | |
1454 | ||
1455 | res = __fuse_direct_read(&io, to, &iocb->ki_pos); | |
1456 | } | |
1457 | ||
1458 | return res; | |
b98d023a MP |
1459 | } |
1460 | ||
15316263 | 1461 | static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from) |
4273b793 | 1462 | { |
e1c0eecb MS |
1463 | struct inode *inode = file_inode(iocb->ki_filp); |
1464 | struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb); | |
15316263 | 1465 | ssize_t res; |
4273b793 AA |
1466 | |
1467 | if (is_bad_inode(inode)) | |
1468 | return -EIO; | |
1469 | ||
1470 | /* Don't allow parallel writes to the same file */ | |
5955102c | 1471 | inode_lock(inode); |
3309dd04 | 1472 | res = generic_write_checks(iocb, from); |
23c94e1c MR |
1473 | if (res > 0) { |
1474 | if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) { | |
1475 | res = fuse_direct_IO(iocb, from); | |
1476 | } else { | |
1477 | res = fuse_direct_io(&io, from, &iocb->ki_pos, | |
1478 | FUSE_DIO_WRITE); | |
1479 | } | |
1480 | } | |
812408fb | 1481 | fuse_invalidate_attr(inode); |
bcba24cc | 1482 | if (res > 0) |
15316263 | 1483 | fuse_write_update_size(inode, iocb->ki_pos); |
5955102c | 1484 | inode_unlock(inode); |
4273b793 AA |
1485 | |
1486 | return res; | |
1487 | } | |
1488 | ||
3be5a52b | 1489 | static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req) |
b6aeaded | 1490 | { |
385b1268 PE |
1491 | int i; |
1492 | ||
1493 | for (i = 0; i < req->num_pages; i++) | |
1494 | __free_page(req->pages[i]); | |
8b284dc4 MS |
1495 | |
1496 | if (req->ff) | |
2e64ff15 | 1497 | fuse_file_put(req->ff, false, false); |
3be5a52b MS |
1498 | } |
1499 | ||
1500 | static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) | |
1501 | { | |
1502 | struct inode *inode = req->inode; | |
1503 | struct fuse_inode *fi = get_fuse_inode(inode); | |
de1414a6 | 1504 | struct backing_dev_info *bdi = inode_to_bdi(inode); |
385b1268 | 1505 | int i; |
3be5a52b MS |
1506 | |
1507 | list_del(&req->writepages_entry); | |
385b1268 | 1508 | for (i = 0; i < req->num_pages; i++) { |
93f78d88 | 1509 | dec_wb_stat(&bdi->wb, WB_WRITEBACK); |
11fb9989 | 1510 | dec_node_page_state(req->pages[i], NR_WRITEBACK_TEMP); |
93f78d88 | 1511 | wb_writeout_inc(&bdi->wb); |
385b1268 | 1512 | } |
3be5a52b MS |
1513 | wake_up(&fi->page_waitq); |
1514 | } | |
1515 | ||
f15ecfef | 1516 | /* Called under fi->lock, may release and reacquire it */ |
6eaf4782 MP |
1517 | static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req, |
1518 | loff_t size) | |
f15ecfef KT |
1519 | __releases(fi->lock) |
1520 | __acquires(fi->lock) | |
3be5a52b | 1521 | { |
e2653bd5 | 1522 | struct fuse_req *aux, *next; |
3be5a52b | 1523 | struct fuse_inode *fi = get_fuse_inode(req->inode); |
3be5a52b | 1524 | struct fuse_write_in *inarg = &req->misc.write.in; |
09cbfeaf | 1525 | __u64 data_size = req->num_pages * PAGE_SIZE; |
63825b4e | 1526 | bool queued; |
3be5a52b | 1527 | |
385b1268 PE |
1528 | if (inarg->offset + data_size <= size) { |
1529 | inarg->size = data_size; | |
3be5a52b | 1530 | } else if (inarg->offset < size) { |
385b1268 | 1531 | inarg->size = size - inarg->offset; |
3be5a52b MS |
1532 | } else { |
1533 | /* Got truncated off completely */ | |
1534 | goto out_free; | |
b6aeaded | 1535 | } |
3be5a52b MS |
1536 | |
1537 | req->in.args[1].size = inarg->size; | |
63825b4e | 1538 | queued = fuse_request_queue_background(fc, req); |
f15ecfef KT |
1539 | /* Fails on broken connection only */ |
1540 | if (unlikely(!queued)) | |
1541 | goto out_free; | |
1542 | ||
1543 | fi->writectr++; | |
3be5a52b MS |
1544 | return; |
1545 | ||
1546 | out_free: | |
1547 | fuse_writepage_finish(fc, req); | |
f15ecfef | 1548 | spin_unlock(&fi->lock); |
e2653bd5 MS |
1549 | |
1550 | /* After fuse_writepage_finish() aux request list is private */ | |
1551 | for (aux = req->misc.write.next; aux; aux = next) { | |
1552 | next = aux->misc.write.next; | |
1553 | aux->misc.write.next = NULL; | |
1554 | fuse_writepage_free(fc, aux); | |
1555 | fuse_put_request(fc, aux); | |
1556 | } | |
1557 | ||
3be5a52b | 1558 | fuse_writepage_free(fc, req); |
e9bb09dd | 1559 | fuse_put_request(fc, req); |
f15ecfef | 1560 | spin_lock(&fi->lock); |
b6aeaded MS |
1561 | } |
1562 | ||
3be5a52b MS |
1563 | /* |
1564 | * If fi->writectr is positive (no truncate or fsync going on) send | |
1565 | * all queued writepage requests. | |
1566 | * | |
f15ecfef | 1567 | * Called with fi->lock |
3be5a52b MS |
1568 | */ |
1569 | void fuse_flush_writepages(struct inode *inode) | |
f15ecfef KT |
1570 | __releases(fi->lock) |
1571 | __acquires(fi->lock) | |
b6aeaded | 1572 | { |
3be5a52b MS |
1573 | struct fuse_conn *fc = get_fuse_conn(inode); |
1574 | struct fuse_inode *fi = get_fuse_inode(inode); | |
6eaf4782 | 1575 | size_t crop = i_size_read(inode); |
3be5a52b MS |
1576 | struct fuse_req *req; |
1577 | ||
1578 | while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { | |
1579 | req = list_entry(fi->queued_writes.next, struct fuse_req, list); | |
1580 | list_del_init(&req->list); | |
6eaf4782 | 1581 | fuse_send_writepage(fc, req, crop); |
3be5a52b MS |
1582 | } |
1583 | } | |
1584 | ||
1585 | static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req) | |
1586 | { | |
1587 | struct inode *inode = req->inode; | |
1588 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1589 | ||
1590 | mapping_set_error(inode->i_mapping, req->out.h.error); | |
f15ecfef | 1591 | spin_lock(&fi->lock); |
8b284dc4 | 1592 | while (req->misc.write.next) { |
6eaf4782 MP |
1593 | struct fuse_conn *fc = get_fuse_conn(inode); |
1594 | struct fuse_write_in *inarg = &req->misc.write.in; | |
8b284dc4 MS |
1595 | struct fuse_req *next = req->misc.write.next; |
1596 | req->misc.write.next = next->misc.write.next; | |
1597 | next->misc.write.next = NULL; | |
ce128de6 | 1598 | next->ff = fuse_file_get(req->ff); |
8b284dc4 | 1599 | list_add(&next->writepages_entry, &fi->writepages); |
6eaf4782 MP |
1600 | |
1601 | /* | |
1602 | * Skip fuse_flush_writepages() to make it easy to crop requests | |
1603 | * based on primary request size. | |
1604 | * | |
1605 | * 1st case (trivial): there are no concurrent activities using | |
1606 | * fuse_set/release_nowrite. Then we're on safe side because | |
1607 | * fuse_flush_writepages() would call fuse_send_writepage() | |
1608 | * anyway. | |
1609 | * | |
1610 | * 2nd case: someone called fuse_set_nowrite and it is waiting | |
1611 | * now for completion of all in-flight requests. This happens | |
1612 | * rarely and no more than once per page, so this should be | |
1613 | * okay. | |
1614 | * | |
1615 | * 3rd case: someone (e.g. fuse_do_setattr()) is in the middle | |
1616 | * of fuse_set_nowrite..fuse_release_nowrite section. The fact | |
1617 | * that fuse_set_nowrite returned implies that all in-flight | |
1618 | * requests were completed along with all of their secondary | |
1619 | * requests. Further primary requests are blocked by negative | |
1620 | * writectr. Hence there cannot be any in-flight requests and | |
1621 | * no invocations of fuse_writepage_end() while we're in | |
1622 | * fuse_set_nowrite..fuse_release_nowrite section. | |
1623 | */ | |
1624 | fuse_send_writepage(fc, next, inarg->offset + inarg->size); | |
8b284dc4 | 1625 | } |
3be5a52b MS |
1626 | fi->writectr--; |
1627 | fuse_writepage_finish(fc, req); | |
f15ecfef | 1628 | spin_unlock(&fi->lock); |
3be5a52b MS |
1629 | fuse_writepage_free(fc, req); |
1630 | } | |
1631 | ||
1e18bda8 MS |
1632 | static struct fuse_file *__fuse_write_file_get(struct fuse_conn *fc, |
1633 | struct fuse_inode *fi) | |
adcadfa8 | 1634 | { |
72523425 | 1635 | struct fuse_file *ff = NULL; |
adcadfa8 | 1636 | |
f15ecfef | 1637 | spin_lock(&fi->lock); |
1e18bda8 | 1638 | if (!list_empty(&fi->write_files)) { |
72523425 MS |
1639 | ff = list_entry(fi->write_files.next, struct fuse_file, |
1640 | write_entry); | |
1641 | fuse_file_get(ff); | |
1642 | } | |
f15ecfef | 1643 | spin_unlock(&fi->lock); |
adcadfa8 PE |
1644 | |
1645 | return ff; | |
1646 | } | |
1647 | ||
1e18bda8 MS |
1648 | static struct fuse_file *fuse_write_file_get(struct fuse_conn *fc, |
1649 | struct fuse_inode *fi) | |
1650 | { | |
1651 | struct fuse_file *ff = __fuse_write_file_get(fc, fi); | |
1652 | WARN_ON(!ff); | |
1653 | return ff; | |
1654 | } | |
1655 | ||
1656 | int fuse_write_inode(struct inode *inode, struct writeback_control *wbc) | |
1657 | { | |
1658 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1659 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1660 | struct fuse_file *ff; | |
1661 | int err; | |
1662 | ||
1663 | ff = __fuse_write_file_get(fc, fi); | |
ab9e13f7 | 1664 | err = fuse_flush_times(inode, ff); |
1e18bda8 | 1665 | if (ff) |
2e64ff15 | 1666 | fuse_file_put(ff, false, false); |
1e18bda8 MS |
1667 | |
1668 | return err; | |
1669 | } | |
1670 | ||
3be5a52b MS |
1671 | static int fuse_writepage_locked(struct page *page) |
1672 | { | |
1673 | struct address_space *mapping = page->mapping; | |
1674 | struct inode *inode = mapping->host; | |
1675 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1676 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1677 | struct fuse_req *req; | |
3be5a52b | 1678 | struct page *tmp_page; |
72523425 | 1679 | int error = -ENOMEM; |
3be5a52b MS |
1680 | |
1681 | set_page_writeback(page); | |
1682 | ||
4250c066 | 1683 | req = fuse_request_alloc_nofs(1); |
3be5a52b MS |
1684 | if (!req) |
1685 | goto err; | |
1686 | ||
825d6d33 MS |
1687 | /* writeback always goes to bg_queue */ |
1688 | __set_bit(FR_BACKGROUND, &req->flags); | |
3be5a52b MS |
1689 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); |
1690 | if (!tmp_page) | |
1691 | goto err_free; | |
1692 | ||
72523425 | 1693 | error = -EIO; |
26d614df | 1694 | req->ff = fuse_write_file_get(fc, fi); |
72523425 | 1695 | if (!req->ff) |
27f1b363 | 1696 | goto err_nofile; |
72523425 | 1697 | |
adcadfa8 | 1698 | fuse_write_fill(req, req->ff, page_offset(page), 0); |
3be5a52b MS |
1699 | |
1700 | copy_highpage(tmp_page, page); | |
2d698b07 | 1701 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; |
8b284dc4 | 1702 | req->misc.write.next = NULL; |
f4975c67 | 1703 | req->in.argpages = 1; |
3be5a52b MS |
1704 | req->num_pages = 1; |
1705 | req->pages[0] = tmp_page; | |
b2430d75 | 1706 | req->page_descs[0].offset = 0; |
85f40aec | 1707 | req->page_descs[0].length = PAGE_SIZE; |
3be5a52b MS |
1708 | req->end = fuse_writepage_end; |
1709 | req->inode = inode; | |
1710 | ||
93f78d88 | 1711 | inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); |
11fb9989 | 1712 | inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP); |
3be5a52b | 1713 | |
f15ecfef | 1714 | spin_lock(&fi->lock); |
3be5a52b MS |
1715 | list_add(&req->writepages_entry, &fi->writepages); |
1716 | list_add_tail(&req->list, &fi->queued_writes); | |
1717 | fuse_flush_writepages(inode); | |
f15ecfef | 1718 | spin_unlock(&fi->lock); |
3be5a52b | 1719 | |
4a4ac4eb MP |
1720 | end_page_writeback(page); |
1721 | ||
3be5a52b MS |
1722 | return 0; |
1723 | ||
27f1b363 MP |
1724 | err_nofile: |
1725 | __free_page(tmp_page); | |
3be5a52b MS |
1726 | err_free: |
1727 | fuse_request_free(req); | |
1728 | err: | |
9183976e | 1729 | mapping_set_error(page->mapping, error); |
3be5a52b | 1730 | end_page_writeback(page); |
72523425 | 1731 | return error; |
3be5a52b MS |
1732 | } |
1733 | ||
1734 | static int fuse_writepage(struct page *page, struct writeback_control *wbc) | |
1735 | { | |
1736 | int err; | |
1737 | ||
ff17be08 MS |
1738 | if (fuse_page_is_writeback(page->mapping->host, page->index)) { |
1739 | /* | |
1740 | * ->writepages() should be called for sync() and friends. We | |
1741 | * should only get here on direct reclaim and then we are | |
1742 | * allowed to skip a page which is already in flight | |
1743 | */ | |
1744 | WARN_ON(wbc->sync_mode == WB_SYNC_ALL); | |
1745 | ||
1746 | redirty_page_for_writepage(wbc, page); | |
1747 | return 0; | |
1748 | } | |
1749 | ||
3be5a52b MS |
1750 | err = fuse_writepage_locked(page); |
1751 | unlock_page(page); | |
1752 | ||
1753 | return err; | |
1754 | } | |
1755 | ||
26d614df PE |
1756 | struct fuse_fill_wb_data { |
1757 | struct fuse_req *req; | |
1758 | struct fuse_file *ff; | |
1759 | struct inode *inode; | |
2d033eaa | 1760 | struct page **orig_pages; |
26d614df PE |
1761 | }; |
1762 | ||
1763 | static void fuse_writepages_send(struct fuse_fill_wb_data *data) | |
1764 | { | |
1765 | struct fuse_req *req = data->req; | |
1766 | struct inode *inode = data->inode; | |
26d614df | 1767 | struct fuse_inode *fi = get_fuse_inode(inode); |
2d033eaa MP |
1768 | int num_pages = req->num_pages; |
1769 | int i; | |
26d614df PE |
1770 | |
1771 | req->ff = fuse_file_get(data->ff); | |
f15ecfef | 1772 | spin_lock(&fi->lock); |
26d614df PE |
1773 | list_add_tail(&req->list, &fi->queued_writes); |
1774 | fuse_flush_writepages(inode); | |
f15ecfef | 1775 | spin_unlock(&fi->lock); |
2d033eaa MP |
1776 | |
1777 | for (i = 0; i < num_pages; i++) | |
1778 | end_page_writeback(data->orig_pages[i]); | |
26d614df PE |
1779 | } |
1780 | ||
7f305ca1 MS |
1781 | /* |
1782 | * First recheck under fi->lock if the offending offset is still under | |
419234d5 MS |
1783 | * writeback. If yes, then iterate auxiliary write requests, to see if there's |
1784 | * one already added for a page at this offset. If there's none, then insert | |
1785 | * this new request onto the auxiliary list, otherwise reuse the existing one by | |
7f305ca1 MS |
1786 | * copying the new page contents over to the old temporary page. |
1787 | */ | |
8b284dc4 MS |
1788 | static bool fuse_writepage_in_flight(struct fuse_req *new_req, |
1789 | struct page *page) | |
1790 | { | |
1791 | struct fuse_conn *fc = get_fuse_conn(new_req->inode); | |
1792 | struct fuse_inode *fi = get_fuse_inode(new_req->inode); | |
1793 | struct fuse_req *tmp; | |
1794 | struct fuse_req *old_req; | |
8b284dc4 | 1795 | |
7f305ca1 | 1796 | WARN_ON(new_req->num_pages != 0); |
8b284dc4 | 1797 | |
f15ecfef | 1798 | spin_lock(&fi->lock); |
8b284dc4 | 1799 | list_del(&new_req->writepages_entry); |
2fe93bd4 MS |
1800 | old_req = fuse_find_writeback(fi, page->index, page->index); |
1801 | if (!old_req) { | |
f6011081 | 1802 | list_add(&new_req->writepages_entry, &fi->writepages); |
f15ecfef | 1803 | spin_unlock(&fi->lock); |
2fe93bd4 | 1804 | return false; |
f6011081 | 1805 | } |
8b284dc4 | 1806 | |
f6011081 | 1807 | new_req->num_pages = 1; |
419234d5 | 1808 | for (tmp = old_req->misc.write.next; tmp; tmp = tmp->misc.write.next) { |
7f305ca1 MS |
1809 | pgoff_t curr_index; |
1810 | ||
1811 | WARN_ON(tmp->inode != new_req->inode); | |
09cbfeaf | 1812 | curr_index = tmp->misc.write.in.offset >> PAGE_SHIFT; |
419234d5 MS |
1813 | if (curr_index == page->index) { |
1814 | WARN_ON(tmp->num_pages != 1); | |
1815 | WARN_ON(!test_bit(FR_PENDING, &tmp->flags)); | |
c5de16cc | 1816 | swap(tmp->pages[0], new_req->pages[0]); |
7f305ca1 | 1817 | break; |
8b284dc4 MS |
1818 | } |
1819 | } | |
1820 | ||
7f305ca1 MS |
1821 | if (!tmp) { |
1822 | new_req->misc.write.next = old_req->misc.write.next; | |
1823 | old_req->misc.write.next = new_req; | |
1824 | } | |
41b6e41f | 1825 | |
f15ecfef | 1826 | spin_unlock(&fi->lock); |
7f305ca1 MS |
1827 | |
1828 | if (tmp) { | |
1829 | struct backing_dev_info *bdi = inode_to_bdi(new_req->inode); | |
8b284dc4 | 1830 | |
93f78d88 | 1831 | dec_wb_stat(&bdi->wb, WB_WRITEBACK); |
a2ebba82 | 1832 | dec_node_page_state(new_req->pages[0], NR_WRITEBACK_TEMP); |
93f78d88 | 1833 | wb_writeout_inc(&bdi->wb); |
8b284dc4 MS |
1834 | fuse_writepage_free(fc, new_req); |
1835 | fuse_request_free(new_req); | |
8b284dc4 | 1836 | } |
7f305ca1 | 1837 | |
2fe93bd4 | 1838 | return true; |
8b284dc4 MS |
1839 | } |
1840 | ||
26d614df PE |
1841 | static int fuse_writepages_fill(struct page *page, |
1842 | struct writeback_control *wbc, void *_data) | |
1843 | { | |
1844 | struct fuse_fill_wb_data *data = _data; | |
1845 | struct fuse_req *req = data->req; | |
1846 | struct inode *inode = data->inode; | |
f15ecfef | 1847 | struct fuse_inode *fi = get_fuse_inode(inode); |
26d614df PE |
1848 | struct fuse_conn *fc = get_fuse_conn(inode); |
1849 | struct page *tmp_page; | |
8b284dc4 | 1850 | bool is_writeback; |
26d614df PE |
1851 | int err; |
1852 | ||
1853 | if (!data->ff) { | |
1854 | err = -EIO; | |
1855 | data->ff = fuse_write_file_get(fc, get_fuse_inode(inode)); | |
1856 | if (!data->ff) | |
1857 | goto out_unlock; | |
1858 | } | |
1859 | ||
8b284dc4 MS |
1860 | /* |
1861 | * Being under writeback is unlikely but possible. For example direct | |
1862 | * read to an mmaped fuse file will set the page dirty twice; once when | |
1863 | * the pages are faulted with get_user_pages(), and then after the read | |
1864 | * completed. | |
1865 | */ | |
1866 | is_writeback = fuse_page_is_writeback(inode, page->index); | |
1867 | ||
1868 | if (req && req->num_pages && | |
5da784cc | 1869 | (is_writeback || req->num_pages == fc->max_pages || |
09cbfeaf | 1870 | (req->num_pages + 1) * PAGE_SIZE > fc->max_write || |
8b284dc4 MS |
1871 | data->orig_pages[req->num_pages - 1]->index + 1 != page->index)) { |
1872 | fuse_writepages_send(data); | |
1873 | data->req = NULL; | |
e52a8250 MS |
1874 | } else if (req && req->num_pages == req->max_pages) { |
1875 | if (!fuse_req_realloc_pages(fc, req, GFP_NOFS)) { | |
1876 | fuse_writepages_send(data); | |
1877 | req = data->req = NULL; | |
1878 | } | |
26d614df | 1879 | } |
e52a8250 | 1880 | |
26d614df PE |
1881 | err = -ENOMEM; |
1882 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1883 | if (!tmp_page) | |
1884 | goto out_unlock; | |
1885 | ||
1886 | /* | |
1887 | * The page must not be redirtied until the writeout is completed | |
1888 | * (i.e. userspace has sent a reply to the write request). Otherwise | |
1889 | * there could be more than one temporary page instance for each real | |
1890 | * page. | |
1891 | * | |
1892 | * This is ensured by holding the page lock in page_mkwrite() while | |
1893 | * checking fuse_page_is_writeback(). We already hold the page lock | |
1894 | * since clear_page_dirty_for_io() and keep it held until we add the | |
1895 | * request to the fi->writepages list and increment req->num_pages. | |
1896 | * After this fuse_page_is_writeback() will indicate that the page is | |
1897 | * under writeback, so we can release the page lock. | |
1898 | */ | |
1899 | if (data->req == NULL) { | |
1900 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1901 | ||
1902 | err = -ENOMEM; | |
e52a8250 | 1903 | req = fuse_request_alloc_nofs(FUSE_REQ_INLINE_PAGES); |
26d614df PE |
1904 | if (!req) { |
1905 | __free_page(tmp_page); | |
1906 | goto out_unlock; | |
1907 | } | |
1908 | ||
1909 | fuse_write_fill(req, data->ff, page_offset(page), 0); | |
1910 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; | |
8b284dc4 | 1911 | req->misc.write.next = NULL; |
26d614df | 1912 | req->in.argpages = 1; |
825d6d33 | 1913 | __set_bit(FR_BACKGROUND, &req->flags); |
26d614df PE |
1914 | req->num_pages = 0; |
1915 | req->end = fuse_writepage_end; | |
1916 | req->inode = inode; | |
1917 | ||
f15ecfef | 1918 | spin_lock(&fi->lock); |
26d614df | 1919 | list_add(&req->writepages_entry, &fi->writepages); |
f15ecfef | 1920 | spin_unlock(&fi->lock); |
26d614df PE |
1921 | |
1922 | data->req = req; | |
1923 | } | |
1924 | set_page_writeback(page); | |
1925 | ||
1926 | copy_highpage(tmp_page, page); | |
1927 | req->pages[req->num_pages] = tmp_page; | |
1928 | req->page_descs[req->num_pages].offset = 0; | |
1929 | req->page_descs[req->num_pages].length = PAGE_SIZE; | |
1930 | ||
93f78d88 | 1931 | inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); |
11fb9989 | 1932 | inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP); |
8b284dc4 MS |
1933 | |
1934 | err = 0; | |
1935 | if (is_writeback && fuse_writepage_in_flight(req, page)) { | |
1936 | end_page_writeback(page); | |
1937 | data->req = NULL; | |
1938 | goto out_unlock; | |
1939 | } | |
2d033eaa | 1940 | data->orig_pages[req->num_pages] = page; |
26d614df PE |
1941 | |
1942 | /* | |
f15ecfef | 1943 | * Protected by fi->lock against concurrent access by |
26d614df PE |
1944 | * fuse_page_is_writeback(). |
1945 | */ | |
f15ecfef | 1946 | spin_lock(&fi->lock); |
26d614df | 1947 | req->num_pages++; |
f15ecfef | 1948 | spin_unlock(&fi->lock); |
26d614df | 1949 | |
26d614df PE |
1950 | out_unlock: |
1951 | unlock_page(page); | |
1952 | ||
1953 | return err; | |
1954 | } | |
1955 | ||
1956 | static int fuse_writepages(struct address_space *mapping, | |
1957 | struct writeback_control *wbc) | |
1958 | { | |
1959 | struct inode *inode = mapping->host; | |
5da784cc | 1960 | struct fuse_conn *fc = get_fuse_conn(inode); |
26d614df PE |
1961 | struct fuse_fill_wb_data data; |
1962 | int err; | |
1963 | ||
1964 | err = -EIO; | |
1965 | if (is_bad_inode(inode)) | |
1966 | goto out; | |
1967 | ||
1968 | data.inode = inode; | |
1969 | data.req = NULL; | |
1970 | data.ff = NULL; | |
1971 | ||
2d033eaa | 1972 | err = -ENOMEM; |
5da784cc | 1973 | data.orig_pages = kcalloc(fc->max_pages, |
f2b3455e | 1974 | sizeof(struct page *), |
2d033eaa MP |
1975 | GFP_NOFS); |
1976 | if (!data.orig_pages) | |
1977 | goto out; | |
1978 | ||
26d614df PE |
1979 | err = write_cache_pages(mapping, wbc, fuse_writepages_fill, &data); |
1980 | if (data.req) { | |
1981 | /* Ignore errors if we can write at least one page */ | |
1982 | BUG_ON(!data.req->num_pages); | |
1983 | fuse_writepages_send(&data); | |
1984 | err = 0; | |
1985 | } | |
1986 | if (data.ff) | |
2e64ff15 | 1987 | fuse_file_put(data.ff, false, false); |
2d033eaa MP |
1988 | |
1989 | kfree(data.orig_pages); | |
26d614df PE |
1990 | out: |
1991 | return err; | |
1992 | } | |
1993 | ||
6b12c1b3 PE |
1994 | /* |
1995 | * It's worthy to make sure that space is reserved on disk for the write, | |
1996 | * but how to implement it without killing performance need more thinking. | |
1997 | */ | |
1998 | static int fuse_write_begin(struct file *file, struct address_space *mapping, | |
1999 | loff_t pos, unsigned len, unsigned flags, | |
2000 | struct page **pagep, void **fsdata) | |
2001 | { | |
09cbfeaf | 2002 | pgoff_t index = pos >> PAGE_SHIFT; |
a455589f | 2003 | struct fuse_conn *fc = get_fuse_conn(file_inode(file)); |
6b12c1b3 PE |
2004 | struct page *page; |
2005 | loff_t fsize; | |
2006 | int err = -ENOMEM; | |
2007 | ||
2008 | WARN_ON(!fc->writeback_cache); | |
2009 | ||
2010 | page = grab_cache_page_write_begin(mapping, index, flags); | |
2011 | if (!page) | |
2012 | goto error; | |
2013 | ||
2014 | fuse_wait_on_page_writeback(mapping->host, page->index); | |
2015 | ||
09cbfeaf | 2016 | if (PageUptodate(page) || len == PAGE_SIZE) |
6b12c1b3 PE |
2017 | goto success; |
2018 | /* | |
2019 | * Check if the start this page comes after the end of file, in which | |
2020 | * case the readpage can be optimized away. | |
2021 | */ | |
2022 | fsize = i_size_read(mapping->host); | |
09cbfeaf KS |
2023 | if (fsize <= (pos & PAGE_MASK)) { |
2024 | size_t off = pos & ~PAGE_MASK; | |
6b12c1b3 PE |
2025 | if (off) |
2026 | zero_user_segment(page, 0, off); | |
2027 | goto success; | |
2028 | } | |
2029 | err = fuse_do_readpage(file, page); | |
2030 | if (err) | |
2031 | goto cleanup; | |
2032 | success: | |
2033 | *pagep = page; | |
2034 | return 0; | |
2035 | ||
2036 | cleanup: | |
2037 | unlock_page(page); | |
09cbfeaf | 2038 | put_page(page); |
6b12c1b3 PE |
2039 | error: |
2040 | return err; | |
2041 | } | |
2042 | ||
2043 | static int fuse_write_end(struct file *file, struct address_space *mapping, | |
2044 | loff_t pos, unsigned len, unsigned copied, | |
2045 | struct page *page, void *fsdata) | |
2046 | { | |
2047 | struct inode *inode = page->mapping->host; | |
2048 | ||
59c3b76c MS |
2049 | /* Haven't copied anything? Skip zeroing, size extending, dirtying. */ |
2050 | if (!copied) | |
2051 | goto unlock; | |
2052 | ||
6b12c1b3 PE |
2053 | if (!PageUptodate(page)) { |
2054 | /* Zero any unwritten bytes at the end of the page */ | |
09cbfeaf | 2055 | size_t endoff = (pos + copied) & ~PAGE_MASK; |
6b12c1b3 | 2056 | if (endoff) |
09cbfeaf | 2057 | zero_user_segment(page, endoff, PAGE_SIZE); |
6b12c1b3 PE |
2058 | SetPageUptodate(page); |
2059 | } | |
2060 | ||
2061 | fuse_write_update_size(inode, pos + copied); | |
2062 | set_page_dirty(page); | |
59c3b76c MS |
2063 | |
2064 | unlock: | |
6b12c1b3 | 2065 | unlock_page(page); |
09cbfeaf | 2066 | put_page(page); |
6b12c1b3 PE |
2067 | |
2068 | return copied; | |
2069 | } | |
2070 | ||
3be5a52b MS |
2071 | static int fuse_launder_page(struct page *page) |
2072 | { | |
2073 | int err = 0; | |
2074 | if (clear_page_dirty_for_io(page)) { | |
2075 | struct inode *inode = page->mapping->host; | |
2076 | err = fuse_writepage_locked(page); | |
2077 | if (!err) | |
2078 | fuse_wait_on_page_writeback(inode, page->index); | |
2079 | } | |
2080 | return err; | |
2081 | } | |
2082 | ||
2083 | /* | |
2084 | * Write back dirty pages now, because there may not be any suitable | |
2085 | * open files later | |
2086 | */ | |
2087 | static void fuse_vma_close(struct vm_area_struct *vma) | |
2088 | { | |
2089 | filemap_write_and_wait(vma->vm_file->f_mapping); | |
2090 | } | |
2091 | ||
2092 | /* | |
2093 | * Wait for writeback against this page to complete before allowing it | |
2094 | * to be marked dirty again, and hence written back again, possibly | |
2095 | * before the previous writepage completed. | |
2096 | * | |
2097 | * Block here, instead of in ->writepage(), so that the userspace fs | |
2098 | * can only block processes actually operating on the filesystem. | |
2099 | * | |
2100 | * Otherwise unprivileged userspace fs would be able to block | |
2101 | * unrelated: | |
2102 | * | |
2103 | * - page migration | |
2104 | * - sync(2) | |
2105 | * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER | |
2106 | */ | |
46fb504a | 2107 | static vm_fault_t fuse_page_mkwrite(struct vm_fault *vmf) |
3be5a52b | 2108 | { |
c2ec175c | 2109 | struct page *page = vmf->page; |
11bac800 | 2110 | struct inode *inode = file_inode(vmf->vma->vm_file); |
cca24370 | 2111 | |
11bac800 | 2112 | file_update_time(vmf->vma->vm_file); |
cca24370 MS |
2113 | lock_page(page); |
2114 | if (page->mapping != inode->i_mapping) { | |
2115 | unlock_page(page); | |
2116 | return VM_FAULT_NOPAGE; | |
2117 | } | |
3be5a52b MS |
2118 | |
2119 | fuse_wait_on_page_writeback(inode, page->index); | |
cca24370 | 2120 | return VM_FAULT_LOCKED; |
3be5a52b MS |
2121 | } |
2122 | ||
f0f37e2f | 2123 | static const struct vm_operations_struct fuse_file_vm_ops = { |
3be5a52b MS |
2124 | .close = fuse_vma_close, |
2125 | .fault = filemap_fault, | |
f1820361 | 2126 | .map_pages = filemap_map_pages, |
3be5a52b MS |
2127 | .page_mkwrite = fuse_page_mkwrite, |
2128 | }; | |
2129 | ||
2130 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) | |
2131 | { | |
650b22b9 PE |
2132 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) |
2133 | fuse_link_write_file(file); | |
2134 | ||
3be5a52b MS |
2135 | file_accessed(file); |
2136 | vma->vm_ops = &fuse_file_vm_ops; | |
b6aeaded MS |
2137 | return 0; |
2138 | } | |
2139 | ||
fc280c96 MS |
2140 | static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) |
2141 | { | |
2142 | /* Can't provide the coherency needed for MAP_SHARED */ | |
2143 | if (vma->vm_flags & VM_MAYSHARE) | |
2144 | return -ENODEV; | |
2145 | ||
3121bfe7 MS |
2146 | invalidate_inode_pages2(file->f_mapping); |
2147 | ||
fc280c96 MS |
2148 | return generic_file_mmap(file, vma); |
2149 | } | |
2150 | ||
0b6e9ea0 SF |
2151 | static int convert_fuse_file_lock(struct fuse_conn *fc, |
2152 | const struct fuse_file_lock *ffl, | |
71421259 MS |
2153 | struct file_lock *fl) |
2154 | { | |
2155 | switch (ffl->type) { | |
2156 | case F_UNLCK: | |
2157 | break; | |
2158 | ||
2159 | case F_RDLCK: | |
2160 | case F_WRLCK: | |
2161 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
2162 | ffl->end < ffl->start) | |
2163 | return -EIO; | |
2164 | ||
2165 | fl->fl_start = ffl->start; | |
2166 | fl->fl_end = ffl->end; | |
0b6e9ea0 SF |
2167 | |
2168 | /* | |
9d5b86ac BC |
2169 | * Convert pid into init's pid namespace. The locks API will |
2170 | * translate it into the caller's pid namespace. | |
0b6e9ea0 SF |
2171 | */ |
2172 | rcu_read_lock(); | |
9d5b86ac | 2173 | fl->fl_pid = pid_nr_ns(find_pid_ns(ffl->pid, fc->pid_ns), &init_pid_ns); |
0b6e9ea0 | 2174 | rcu_read_unlock(); |
71421259 MS |
2175 | break; |
2176 | ||
2177 | default: | |
2178 | return -EIO; | |
2179 | } | |
2180 | fl->fl_type = ffl->type; | |
2181 | return 0; | |
2182 | } | |
2183 | ||
7078187a | 2184 | static void fuse_lk_fill(struct fuse_args *args, struct file *file, |
a9ff4f87 | 2185 | const struct file_lock *fl, int opcode, pid_t pid, |
7078187a | 2186 | int flock, struct fuse_lk_in *inarg) |
71421259 | 2187 | { |
6131ffaa | 2188 | struct inode *inode = file_inode(file); |
9c8ef561 | 2189 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 | 2190 | struct fuse_file *ff = file->private_data; |
7078187a MS |
2191 | |
2192 | memset(inarg, 0, sizeof(*inarg)); | |
2193 | inarg->fh = ff->fh; | |
2194 | inarg->owner = fuse_lock_owner_id(fc, fl->fl_owner); | |
2195 | inarg->lk.start = fl->fl_start; | |
2196 | inarg->lk.end = fl->fl_end; | |
2197 | inarg->lk.type = fl->fl_type; | |
2198 | inarg->lk.pid = pid; | |
a9ff4f87 | 2199 | if (flock) |
7078187a MS |
2200 | inarg->lk_flags |= FUSE_LK_FLOCK; |
2201 | args->in.h.opcode = opcode; | |
2202 | args->in.h.nodeid = get_node_id(inode); | |
2203 | args->in.numargs = 1; | |
2204 | args->in.args[0].size = sizeof(*inarg); | |
2205 | args->in.args[0].value = inarg; | |
71421259 MS |
2206 | } |
2207 | ||
2208 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
2209 | { | |
6131ffaa | 2210 | struct inode *inode = file_inode(file); |
71421259 | 2211 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a MS |
2212 | FUSE_ARGS(args); |
2213 | struct fuse_lk_in inarg; | |
71421259 MS |
2214 | struct fuse_lk_out outarg; |
2215 | int err; | |
2216 | ||
7078187a MS |
2217 | fuse_lk_fill(&args, file, fl, FUSE_GETLK, 0, 0, &inarg); |
2218 | args.out.numargs = 1; | |
2219 | args.out.args[0].size = sizeof(outarg); | |
2220 | args.out.args[0].value = &outarg; | |
2221 | err = fuse_simple_request(fc, &args); | |
71421259 | 2222 | if (!err) |
0b6e9ea0 | 2223 | err = convert_fuse_file_lock(fc, &outarg.lk, fl); |
71421259 MS |
2224 | |
2225 | return err; | |
2226 | } | |
2227 | ||
a9ff4f87 | 2228 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 2229 | { |
6131ffaa | 2230 | struct inode *inode = file_inode(file); |
71421259 | 2231 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a MS |
2232 | FUSE_ARGS(args); |
2233 | struct fuse_lk_in inarg; | |
71421259 | 2234 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; |
0b6e9ea0 SF |
2235 | struct pid *pid = fl->fl_type != F_UNLCK ? task_tgid(current) : NULL; |
2236 | pid_t pid_nr = pid_nr_ns(pid, fc->pid_ns); | |
71421259 MS |
2237 | int err; |
2238 | ||
8fb47a4f | 2239 | if (fl->fl_lmops && fl->fl_lmops->lm_grant) { |
48e90761 MS |
2240 | /* NLM needs asynchronous locks, which we don't support yet */ |
2241 | return -ENOLCK; | |
2242 | } | |
2243 | ||
71421259 | 2244 | /* Unlock on close is handled by the flush method */ |
50f2112c | 2245 | if ((fl->fl_flags & FL_CLOSE_POSIX) == FL_CLOSE_POSIX) |
71421259 MS |
2246 | return 0; |
2247 | ||
0b6e9ea0 | 2248 | fuse_lk_fill(&args, file, fl, opcode, pid_nr, flock, &inarg); |
7078187a | 2249 | err = fuse_simple_request(fc, &args); |
71421259 | 2250 | |
a4d27e75 MS |
2251 | /* locking is restartable */ |
2252 | if (err == -EINTR) | |
2253 | err = -ERESTARTSYS; | |
7078187a | 2254 | |
71421259 MS |
2255 | return err; |
2256 | } | |
2257 | ||
2258 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
2259 | { | |
6131ffaa | 2260 | struct inode *inode = file_inode(file); |
71421259 MS |
2261 | struct fuse_conn *fc = get_fuse_conn(inode); |
2262 | int err; | |
2263 | ||
48e90761 MS |
2264 | if (cmd == F_CANCELLK) { |
2265 | err = 0; | |
2266 | } else if (cmd == F_GETLK) { | |
71421259 | 2267 | if (fc->no_lock) { |
9d6a8c5c | 2268 | posix_test_lock(file, fl); |
71421259 MS |
2269 | err = 0; |
2270 | } else | |
2271 | err = fuse_getlk(file, fl); | |
2272 | } else { | |
2273 | if (fc->no_lock) | |
48e90761 | 2274 | err = posix_lock_file(file, fl, NULL); |
71421259 | 2275 | else |
a9ff4f87 | 2276 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
2277 | } |
2278 | return err; | |
2279 | } | |
2280 | ||
a9ff4f87 MS |
2281 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
2282 | { | |
6131ffaa | 2283 | struct inode *inode = file_inode(file); |
a9ff4f87 MS |
2284 | struct fuse_conn *fc = get_fuse_conn(inode); |
2285 | int err; | |
2286 | ||
37fb3a30 | 2287 | if (fc->no_flock) { |
4f656367 | 2288 | err = locks_lock_file_wait(file, fl); |
a9ff4f87 | 2289 | } else { |
37fb3a30 MS |
2290 | struct fuse_file *ff = file->private_data; |
2291 | ||
a9ff4f87 | 2292 | /* emulate flock with POSIX locks */ |
37fb3a30 | 2293 | ff->flock = true; |
a9ff4f87 MS |
2294 | err = fuse_setlk(file, fl, 1); |
2295 | } | |
2296 | ||
2297 | return err; | |
2298 | } | |
2299 | ||
b2d2272f MS |
2300 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
2301 | { | |
2302 | struct inode *inode = mapping->host; | |
2303 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 2304 | FUSE_ARGS(args); |
b2d2272f MS |
2305 | struct fuse_bmap_in inarg; |
2306 | struct fuse_bmap_out outarg; | |
2307 | int err; | |
2308 | ||
2309 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
2310 | return 0; | |
2311 | ||
b2d2272f MS |
2312 | memset(&inarg, 0, sizeof(inarg)); |
2313 | inarg.block = block; | |
2314 | inarg.blocksize = inode->i_sb->s_blocksize; | |
7078187a MS |
2315 | args.in.h.opcode = FUSE_BMAP; |
2316 | args.in.h.nodeid = get_node_id(inode); | |
2317 | args.in.numargs = 1; | |
2318 | args.in.args[0].size = sizeof(inarg); | |
2319 | args.in.args[0].value = &inarg; | |
2320 | args.out.numargs = 1; | |
2321 | args.out.args[0].size = sizeof(outarg); | |
2322 | args.out.args[0].value = &outarg; | |
2323 | err = fuse_simple_request(fc, &args); | |
b2d2272f MS |
2324 | if (err == -ENOSYS) |
2325 | fc->no_bmap = 1; | |
2326 | ||
2327 | return err ? 0 : outarg.block; | |
2328 | } | |
2329 | ||
0b5da8db R |
2330 | static loff_t fuse_lseek(struct file *file, loff_t offset, int whence) |
2331 | { | |
2332 | struct inode *inode = file->f_mapping->host; | |
2333 | struct fuse_conn *fc = get_fuse_conn(inode); | |
2334 | struct fuse_file *ff = file->private_data; | |
2335 | FUSE_ARGS(args); | |
2336 | struct fuse_lseek_in inarg = { | |
2337 | .fh = ff->fh, | |
2338 | .offset = offset, | |
2339 | .whence = whence | |
2340 | }; | |
2341 | struct fuse_lseek_out outarg; | |
2342 | int err; | |
2343 | ||
2344 | if (fc->no_lseek) | |
2345 | goto fallback; | |
2346 | ||
2347 | args.in.h.opcode = FUSE_LSEEK; | |
2348 | args.in.h.nodeid = ff->nodeid; | |
2349 | args.in.numargs = 1; | |
2350 | args.in.args[0].size = sizeof(inarg); | |
2351 | args.in.args[0].value = &inarg; | |
2352 | args.out.numargs = 1; | |
2353 | args.out.args[0].size = sizeof(outarg); | |
2354 | args.out.args[0].value = &outarg; | |
2355 | err = fuse_simple_request(fc, &args); | |
2356 | if (err) { | |
2357 | if (err == -ENOSYS) { | |
2358 | fc->no_lseek = 1; | |
2359 | goto fallback; | |
2360 | } | |
2361 | return err; | |
2362 | } | |
2363 | ||
2364 | return vfs_setpos(file, outarg.offset, inode->i_sb->s_maxbytes); | |
2365 | ||
2366 | fallback: | |
5b97eeac | 2367 | err = fuse_update_attributes(inode, file); |
0b5da8db R |
2368 | if (!err) |
2369 | return generic_file_llseek(file, offset, whence); | |
2370 | else | |
2371 | return err; | |
2372 | } | |
2373 | ||
965c8e59 | 2374 | static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence) |
5559b8f4 MS |
2375 | { |
2376 | loff_t retval; | |
6131ffaa | 2377 | struct inode *inode = file_inode(file); |
5559b8f4 | 2378 | |
0b5da8db R |
2379 | switch (whence) { |
2380 | case SEEK_SET: | |
2381 | case SEEK_CUR: | |
2382 | /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */ | |
965c8e59 | 2383 | retval = generic_file_llseek(file, offset, whence); |
0b5da8db R |
2384 | break; |
2385 | case SEEK_END: | |
5955102c | 2386 | inode_lock(inode); |
5b97eeac | 2387 | retval = fuse_update_attributes(inode, file); |
0b5da8db R |
2388 | if (!retval) |
2389 | retval = generic_file_llseek(file, offset, whence); | |
5955102c | 2390 | inode_unlock(inode); |
0b5da8db R |
2391 | break; |
2392 | case SEEK_HOLE: | |
2393 | case SEEK_DATA: | |
5955102c | 2394 | inode_lock(inode); |
0b5da8db | 2395 | retval = fuse_lseek(file, offset, whence); |
5955102c | 2396 | inode_unlock(inode); |
0b5da8db R |
2397 | break; |
2398 | default: | |
2399 | retval = -EINVAL; | |
2400 | } | |
c07c3d19 | 2401 | |
5559b8f4 MS |
2402 | return retval; |
2403 | } | |
2404 | ||
d9d318d3 MS |
2405 | /* |
2406 | * CUSE servers compiled on 32bit broke on 64bit kernels because the | |
2407 | * ABI was defined to be 'struct iovec' which is different on 32bit | |
2408 | * and 64bit. Fortunately we can determine which structure the server | |
2409 | * used from the size of the reply. | |
2410 | */ | |
1baa26b2 MS |
2411 | static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, |
2412 | size_t transferred, unsigned count, | |
2413 | bool is_compat) | |
d9d318d3 MS |
2414 | { |
2415 | #ifdef CONFIG_COMPAT | |
2416 | if (count * sizeof(struct compat_iovec) == transferred) { | |
2417 | struct compat_iovec *ciov = src; | |
2418 | unsigned i; | |
2419 | ||
2420 | /* | |
2421 | * With this interface a 32bit server cannot support | |
2422 | * non-compat (i.e. ones coming from 64bit apps) ioctl | |
2423 | * requests | |
2424 | */ | |
2425 | if (!is_compat) | |
2426 | return -EINVAL; | |
2427 | ||
2428 | for (i = 0; i < count; i++) { | |
2429 | dst[i].iov_base = compat_ptr(ciov[i].iov_base); | |
2430 | dst[i].iov_len = ciov[i].iov_len; | |
2431 | } | |
2432 | return 0; | |
2433 | } | |
2434 | #endif | |
2435 | ||
2436 | if (count * sizeof(struct iovec) != transferred) | |
2437 | return -EIO; | |
2438 | ||
2439 | memcpy(dst, src, transferred); | |
2440 | return 0; | |
2441 | } | |
2442 | ||
7572777e | 2443 | /* Make sure iov_length() won't overflow */ |
5da784cc CS |
2444 | static int fuse_verify_ioctl_iov(struct fuse_conn *fc, struct iovec *iov, |
2445 | size_t count) | |
7572777e MS |
2446 | { |
2447 | size_t n; | |
5da784cc | 2448 | u32 max = fc->max_pages << PAGE_SHIFT; |
7572777e | 2449 | |
fb6ccff6 | 2450 | for (n = 0; n < count; n++, iov++) { |
7572777e MS |
2451 | if (iov->iov_len > (size_t) max) |
2452 | return -ENOMEM; | |
2453 | max -= iov->iov_len; | |
2454 | } | |
2455 | return 0; | |
2456 | } | |
2457 | ||
1baa26b2 MS |
2458 | static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, |
2459 | void *src, size_t transferred, unsigned count, | |
2460 | bool is_compat) | |
2461 | { | |
2462 | unsigned i; | |
2463 | struct fuse_ioctl_iovec *fiov = src; | |
2464 | ||
2465 | if (fc->minor < 16) { | |
2466 | return fuse_copy_ioctl_iovec_old(dst, src, transferred, | |
2467 | count, is_compat); | |
2468 | } | |
2469 | ||
2470 | if (count * sizeof(struct fuse_ioctl_iovec) != transferred) | |
2471 | return -EIO; | |
2472 | ||
2473 | for (i = 0; i < count; i++) { | |
2474 | /* Did the server supply an inappropriate value? */ | |
2475 | if (fiov[i].base != (unsigned long) fiov[i].base || | |
2476 | fiov[i].len != (unsigned long) fiov[i].len) | |
2477 | return -EIO; | |
2478 | ||
2479 | dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; | |
2480 | dst[i].iov_len = (size_t) fiov[i].len; | |
2481 | ||
2482 | #ifdef CONFIG_COMPAT | |
2483 | if (is_compat && | |
2484 | (ptr_to_compat(dst[i].iov_base) != fiov[i].base || | |
2485 | (compat_size_t) dst[i].iov_len != fiov[i].len)) | |
2486 | return -EIO; | |
2487 | #endif | |
2488 | } | |
2489 | ||
2490 | return 0; | |
2491 | } | |
2492 | ||
2493 | ||
59efec7b TH |
2494 | /* |
2495 | * For ioctls, there is no generic way to determine how much memory | |
2496 | * needs to be read and/or written. Furthermore, ioctls are allowed | |
2497 | * to dereference the passed pointer, so the parameter requires deep | |
2498 | * copying but FUSE has no idea whatsoever about what to copy in or | |
2499 | * out. | |
2500 | * | |
2501 | * This is solved by allowing FUSE server to retry ioctl with | |
2502 | * necessary in/out iovecs. Let's assume the ioctl implementation | |
2503 | * needs to read in the following structure. | |
2504 | * | |
2505 | * struct a { | |
2506 | * char *buf; | |
2507 | * size_t buflen; | |
2508 | * } | |
2509 | * | |
2510 | * On the first callout to FUSE server, inarg->in_size and | |
2511 | * inarg->out_size will be NULL; then, the server completes the ioctl | |
2512 | * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and | |
2513 | * the actual iov array to | |
2514 | * | |
2515 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } | |
2516 | * | |
2517 | * which tells FUSE to copy in the requested area and retry the ioctl. | |
2518 | * On the second round, the server has access to the structure and | |
2519 | * from that it can tell what to look for next, so on the invocation, | |
2520 | * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to | |
2521 | * | |
2522 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, | |
2523 | * { .iov_base = a.buf, .iov_len = a.buflen } } | |
2524 | * | |
2525 | * FUSE will copy both struct a and the pointed buffer from the | |
2526 | * process doing the ioctl and retry ioctl with both struct a and the | |
2527 | * buffer. | |
2528 | * | |
2529 | * This time, FUSE server has everything it needs and completes ioctl | |
2530 | * without FUSE_IOCTL_RETRY which finishes the ioctl call. | |
2531 | * | |
2532 | * Copying data out works the same way. | |
2533 | * | |
2534 | * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel | |
2535 | * automatically initializes in and out iovs by decoding @cmd with | |
2536 | * _IOC_* macros and the server is not allowed to request RETRY. This | |
2537 | * limits ioctl data transfers to well-formed ioctls and is the forced | |
2538 | * behavior for all FUSE servers. | |
2539 | */ | |
08cbf542 TH |
2540 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
2541 | unsigned int flags) | |
59efec7b | 2542 | { |
59efec7b | 2543 | struct fuse_file *ff = file->private_data; |
d36f2487 | 2544 | struct fuse_conn *fc = ff->fc; |
59efec7b TH |
2545 | struct fuse_ioctl_in inarg = { |
2546 | .fh = ff->fh, | |
2547 | .cmd = cmd, | |
2548 | .arg = arg, | |
2549 | .flags = flags | |
2550 | }; | |
2551 | struct fuse_ioctl_out outarg; | |
2552 | struct fuse_req *req = NULL; | |
2553 | struct page **pages = NULL; | |
8ac83505 | 2554 | struct iovec *iov_page = NULL; |
59efec7b TH |
2555 | struct iovec *in_iov = NULL, *out_iov = NULL; |
2556 | unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages; | |
acbe5fda MS |
2557 | size_t in_size, out_size, transferred, c; |
2558 | int err, i; | |
2559 | struct iov_iter ii; | |
59efec7b | 2560 | |
1baa26b2 MS |
2561 | #if BITS_PER_LONG == 32 |
2562 | inarg.flags |= FUSE_IOCTL_32BIT; | |
2563 | #else | |
2564 | if (flags & FUSE_IOCTL_COMPAT) | |
2565 | inarg.flags |= FUSE_IOCTL_32BIT; | |
2566 | #endif | |
2567 | ||
59efec7b | 2568 | /* assume all the iovs returned by client always fits in a page */ |
1baa26b2 | 2569 | BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); |
59efec7b | 2570 | |
59efec7b | 2571 | err = -ENOMEM; |
5da784cc | 2572 | pages = kcalloc(fc->max_pages, sizeof(pages[0]), GFP_KERNEL); |
8ac83505 | 2573 | iov_page = (struct iovec *) __get_free_page(GFP_KERNEL); |
59efec7b TH |
2574 | if (!pages || !iov_page) |
2575 | goto out; | |
2576 | ||
2577 | /* | |
2578 | * If restricted, initialize IO parameters as encoded in @cmd. | |
2579 | * RETRY from server is not allowed. | |
2580 | */ | |
2581 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { | |
8ac83505 | 2582 | struct iovec *iov = iov_page; |
59efec7b | 2583 | |
c9f0523d | 2584 | iov->iov_base = (void __user *)arg; |
59efec7b TH |
2585 | iov->iov_len = _IOC_SIZE(cmd); |
2586 | ||
2587 | if (_IOC_DIR(cmd) & _IOC_WRITE) { | |
2588 | in_iov = iov; | |
2589 | in_iovs = 1; | |
2590 | } | |
2591 | ||
2592 | if (_IOC_DIR(cmd) & _IOC_READ) { | |
2593 | out_iov = iov; | |
2594 | out_iovs = 1; | |
2595 | } | |
2596 | } | |
2597 | ||
2598 | retry: | |
2599 | inarg.in_size = in_size = iov_length(in_iov, in_iovs); | |
2600 | inarg.out_size = out_size = iov_length(out_iov, out_iovs); | |
2601 | ||
2602 | /* | |
2603 | * Out data can be used either for actual out data or iovs, | |
2604 | * make sure there always is at least one page. | |
2605 | */ | |
2606 | out_size = max_t(size_t, out_size, PAGE_SIZE); | |
2607 | max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); | |
2608 | ||
2609 | /* make sure there are enough buffer pages and init request with them */ | |
2610 | err = -ENOMEM; | |
5da784cc | 2611 | if (max_pages > fc->max_pages) |
59efec7b TH |
2612 | goto out; |
2613 | while (num_pages < max_pages) { | |
2614 | pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); | |
2615 | if (!pages[num_pages]) | |
2616 | goto out; | |
2617 | num_pages++; | |
2618 | } | |
2619 | ||
54b96670 | 2620 | req = fuse_get_req(fc, num_pages); |
59efec7b TH |
2621 | if (IS_ERR(req)) { |
2622 | err = PTR_ERR(req); | |
2623 | req = NULL; | |
2624 | goto out; | |
2625 | } | |
2626 | memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages); | |
2627 | req->num_pages = num_pages; | |
7c190c8b | 2628 | fuse_page_descs_length_init(req, 0, req->num_pages); |
59efec7b TH |
2629 | |
2630 | /* okay, let's send it to the client */ | |
2631 | req->in.h.opcode = FUSE_IOCTL; | |
d36f2487 | 2632 | req->in.h.nodeid = ff->nodeid; |
59efec7b TH |
2633 | req->in.numargs = 1; |
2634 | req->in.args[0].size = sizeof(inarg); | |
2635 | req->in.args[0].value = &inarg; | |
2636 | if (in_size) { | |
2637 | req->in.numargs++; | |
2638 | req->in.args[1].size = in_size; | |
2639 | req->in.argpages = 1; | |
2640 | ||
acbe5fda MS |
2641 | err = -EFAULT; |
2642 | iov_iter_init(&ii, WRITE, in_iov, in_iovs, in_size); | |
2643 | for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= num_pages); i++) { | |
2644 | c = copy_page_from_iter(pages[i], 0, PAGE_SIZE, &ii); | |
2645 | if (c != PAGE_SIZE && iov_iter_count(&ii)) | |
2646 | goto out; | |
2647 | } | |
59efec7b TH |
2648 | } |
2649 | ||
2650 | req->out.numargs = 2; | |
2651 | req->out.args[0].size = sizeof(outarg); | |
2652 | req->out.args[0].value = &outarg; | |
2653 | req->out.args[1].size = out_size; | |
2654 | req->out.argpages = 1; | |
2655 | req->out.argvar = 1; | |
2656 | ||
b93f858a | 2657 | fuse_request_send(fc, req); |
59efec7b TH |
2658 | err = req->out.h.error; |
2659 | transferred = req->out.args[1].size; | |
2660 | fuse_put_request(fc, req); | |
2661 | req = NULL; | |
2662 | if (err) | |
2663 | goto out; | |
2664 | ||
2665 | /* did it ask for retry? */ | |
2666 | if (outarg.flags & FUSE_IOCTL_RETRY) { | |
8ac83505 | 2667 | void *vaddr; |
59efec7b TH |
2668 | |
2669 | /* no retry if in restricted mode */ | |
2670 | err = -EIO; | |
2671 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) | |
2672 | goto out; | |
2673 | ||
2674 | in_iovs = outarg.in_iovs; | |
2675 | out_iovs = outarg.out_iovs; | |
2676 | ||
2677 | /* | |
2678 | * Make sure things are in boundary, separate checks | |
2679 | * are to protect against overflow. | |
2680 | */ | |
2681 | err = -ENOMEM; | |
2682 | if (in_iovs > FUSE_IOCTL_MAX_IOV || | |
2683 | out_iovs > FUSE_IOCTL_MAX_IOV || | |
2684 | in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) | |
2685 | goto out; | |
2686 | ||
2408f6ef | 2687 | vaddr = kmap_atomic(pages[0]); |
1baa26b2 | 2688 | err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr, |
d9d318d3 MS |
2689 | transferred, in_iovs + out_iovs, |
2690 | (flags & FUSE_IOCTL_COMPAT) != 0); | |
2408f6ef | 2691 | kunmap_atomic(vaddr); |
d9d318d3 MS |
2692 | if (err) |
2693 | goto out; | |
59efec7b | 2694 | |
8ac83505 | 2695 | in_iov = iov_page; |
59efec7b TH |
2696 | out_iov = in_iov + in_iovs; |
2697 | ||
5da784cc | 2698 | err = fuse_verify_ioctl_iov(fc, in_iov, in_iovs); |
7572777e MS |
2699 | if (err) |
2700 | goto out; | |
2701 | ||
5da784cc | 2702 | err = fuse_verify_ioctl_iov(fc, out_iov, out_iovs); |
7572777e MS |
2703 | if (err) |
2704 | goto out; | |
2705 | ||
59efec7b TH |
2706 | goto retry; |
2707 | } | |
2708 | ||
2709 | err = -EIO; | |
2710 | if (transferred > inarg.out_size) | |
2711 | goto out; | |
2712 | ||
acbe5fda MS |
2713 | err = -EFAULT; |
2714 | iov_iter_init(&ii, READ, out_iov, out_iovs, transferred); | |
2715 | for (i = 0; iov_iter_count(&ii) && !WARN_ON(i >= num_pages); i++) { | |
2716 | c = copy_page_to_iter(pages[i], 0, PAGE_SIZE, &ii); | |
2717 | if (c != PAGE_SIZE && iov_iter_count(&ii)) | |
2718 | goto out; | |
2719 | } | |
2720 | err = 0; | |
59efec7b TH |
2721 | out: |
2722 | if (req) | |
2723 | fuse_put_request(fc, req); | |
8ac83505 | 2724 | free_page((unsigned long) iov_page); |
59efec7b TH |
2725 | while (num_pages) |
2726 | __free_page(pages[--num_pages]); | |
2727 | kfree(pages); | |
2728 | ||
2729 | return err ? err : outarg.result; | |
2730 | } | |
08cbf542 | 2731 | EXPORT_SYMBOL_GPL(fuse_do_ioctl); |
59efec7b | 2732 | |
b18da0c5 MS |
2733 | long fuse_ioctl_common(struct file *file, unsigned int cmd, |
2734 | unsigned long arg, unsigned int flags) | |
d36f2487 | 2735 | { |
6131ffaa | 2736 | struct inode *inode = file_inode(file); |
d36f2487 MS |
2737 | struct fuse_conn *fc = get_fuse_conn(inode); |
2738 | ||
c2132c1b | 2739 | if (!fuse_allow_current_process(fc)) |
d36f2487 MS |
2740 | return -EACCES; |
2741 | ||
2742 | if (is_bad_inode(inode)) | |
2743 | return -EIO; | |
2744 | ||
2745 | return fuse_do_ioctl(file, cmd, arg, flags); | |
2746 | } | |
2747 | ||
59efec7b TH |
2748 | static long fuse_file_ioctl(struct file *file, unsigned int cmd, |
2749 | unsigned long arg) | |
2750 | { | |
b18da0c5 | 2751 | return fuse_ioctl_common(file, cmd, arg, 0); |
59efec7b TH |
2752 | } |
2753 | ||
2754 | static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, | |
2755 | unsigned long arg) | |
2756 | { | |
b18da0c5 | 2757 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); |
59efec7b TH |
2758 | } |
2759 | ||
95668a69 TH |
2760 | /* |
2761 | * All files which have been polled are linked to RB tree | |
2762 | * fuse_conn->polled_files which is indexed by kh. Walk the tree and | |
2763 | * find the matching one. | |
2764 | */ | |
2765 | static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh, | |
2766 | struct rb_node **parent_out) | |
2767 | { | |
2768 | struct rb_node **link = &fc->polled_files.rb_node; | |
2769 | struct rb_node *last = NULL; | |
2770 | ||
2771 | while (*link) { | |
2772 | struct fuse_file *ff; | |
2773 | ||
2774 | last = *link; | |
2775 | ff = rb_entry(last, struct fuse_file, polled_node); | |
2776 | ||
2777 | if (kh < ff->kh) | |
2778 | link = &last->rb_left; | |
2779 | else if (kh > ff->kh) | |
2780 | link = &last->rb_right; | |
2781 | else | |
2782 | return link; | |
2783 | } | |
2784 | ||
2785 | if (parent_out) | |
2786 | *parent_out = last; | |
2787 | return link; | |
2788 | } | |
2789 | ||
2790 | /* | |
2791 | * The file is about to be polled. Make sure it's on the polled_files | |
2792 | * RB tree. Note that files once added to the polled_files tree are | |
2793 | * not removed before the file is released. This is because a file | |
2794 | * polled once is likely to be polled again. | |
2795 | */ | |
2796 | static void fuse_register_polled_file(struct fuse_conn *fc, | |
2797 | struct fuse_file *ff) | |
2798 | { | |
2799 | spin_lock(&fc->lock); | |
2800 | if (RB_EMPTY_NODE(&ff->polled_node)) { | |
f3846266 | 2801 | struct rb_node **link, *uninitialized_var(parent); |
95668a69 TH |
2802 | |
2803 | link = fuse_find_polled_node(fc, ff->kh, &parent); | |
2804 | BUG_ON(*link); | |
2805 | rb_link_node(&ff->polled_node, parent, link); | |
2806 | rb_insert_color(&ff->polled_node, &fc->polled_files); | |
2807 | } | |
2808 | spin_unlock(&fc->lock); | |
2809 | } | |
2810 | ||
076ccb76 | 2811 | __poll_t fuse_file_poll(struct file *file, poll_table *wait) |
95668a69 | 2812 | { |
95668a69 | 2813 | struct fuse_file *ff = file->private_data; |
797759aa | 2814 | struct fuse_conn *fc = ff->fc; |
95668a69 TH |
2815 | struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; |
2816 | struct fuse_poll_out outarg; | |
7078187a | 2817 | FUSE_ARGS(args); |
95668a69 TH |
2818 | int err; |
2819 | ||
2820 | if (fc->no_poll) | |
2821 | return DEFAULT_POLLMASK; | |
2822 | ||
2823 | poll_wait(file, &ff->poll_wait, wait); | |
c71d227f | 2824 | inarg.events = mangle_poll(poll_requested_events(wait)); |
95668a69 TH |
2825 | |
2826 | /* | |
2827 | * Ask for notification iff there's someone waiting for it. | |
2828 | * The client may ignore the flag and always notify. | |
2829 | */ | |
2830 | if (waitqueue_active(&ff->poll_wait)) { | |
2831 | inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY; | |
2832 | fuse_register_polled_file(fc, ff); | |
2833 | } | |
2834 | ||
7078187a MS |
2835 | args.in.h.opcode = FUSE_POLL; |
2836 | args.in.h.nodeid = ff->nodeid; | |
2837 | args.in.numargs = 1; | |
2838 | args.in.args[0].size = sizeof(inarg); | |
2839 | args.in.args[0].value = &inarg; | |
2840 | args.out.numargs = 1; | |
2841 | args.out.args[0].size = sizeof(outarg); | |
2842 | args.out.args[0].value = &outarg; | |
2843 | err = fuse_simple_request(fc, &args); | |
95668a69 TH |
2844 | |
2845 | if (!err) | |
c71d227f | 2846 | return demangle_poll(outarg.revents); |
95668a69 TH |
2847 | if (err == -ENOSYS) { |
2848 | fc->no_poll = 1; | |
2849 | return DEFAULT_POLLMASK; | |
2850 | } | |
a9a08845 | 2851 | return EPOLLERR; |
95668a69 | 2852 | } |
08cbf542 | 2853 | EXPORT_SYMBOL_GPL(fuse_file_poll); |
95668a69 TH |
2854 | |
2855 | /* | |
2856 | * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and | |
2857 | * wakes up the poll waiters. | |
2858 | */ | |
2859 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, | |
2860 | struct fuse_notify_poll_wakeup_out *outarg) | |
2861 | { | |
2862 | u64 kh = outarg->kh; | |
2863 | struct rb_node **link; | |
2864 | ||
2865 | spin_lock(&fc->lock); | |
2866 | ||
2867 | link = fuse_find_polled_node(fc, kh, NULL); | |
2868 | if (*link) { | |
2869 | struct fuse_file *ff; | |
2870 | ||
2871 | ff = rb_entry(*link, struct fuse_file, polled_node); | |
2872 | wake_up_interruptible_sync(&ff->poll_wait); | |
2873 | } | |
2874 | ||
2875 | spin_unlock(&fc->lock); | |
2876 | return 0; | |
2877 | } | |
2878 | ||
efb9fa9e MP |
2879 | static void fuse_do_truncate(struct file *file) |
2880 | { | |
2881 | struct inode *inode = file->f_mapping->host; | |
2882 | struct iattr attr; | |
2883 | ||
2884 | attr.ia_valid = ATTR_SIZE; | |
2885 | attr.ia_size = i_size_read(inode); | |
2886 | ||
2887 | attr.ia_file = file; | |
2888 | attr.ia_valid |= ATTR_FILE; | |
2889 | ||
62490330 | 2890 | fuse_do_setattr(file_dentry(file), &attr, file); |
efb9fa9e MP |
2891 | } |
2892 | ||
5da784cc | 2893 | static inline loff_t fuse_round_up(struct fuse_conn *fc, loff_t off) |
e5c5f05d | 2894 | { |
5da784cc | 2895 | return round_up(off, fc->max_pages << PAGE_SHIFT); |
e5c5f05d MP |
2896 | } |
2897 | ||
4273b793 | 2898 | static ssize_t |
c8b8e32d | 2899 | fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
4273b793 | 2900 | { |
9d5722b7 | 2901 | DECLARE_COMPLETION_ONSTACK(wait); |
4273b793 | 2902 | ssize_t ret = 0; |
60b9df7a MS |
2903 | struct file *file = iocb->ki_filp; |
2904 | struct fuse_file *ff = file->private_data; | |
e5c5f05d | 2905 | bool async_dio = ff->fc->async_dio; |
4273b793 | 2906 | loff_t pos = 0; |
bcba24cc MP |
2907 | struct inode *inode; |
2908 | loff_t i_size; | |
a6cbcd4a | 2909 | size_t count = iov_iter_count(iter); |
c8b8e32d | 2910 | loff_t offset = iocb->ki_pos; |
36cf66ed | 2911 | struct fuse_io_priv *io; |
4273b793 | 2912 | |
4273b793 | 2913 | pos = offset; |
bcba24cc MP |
2914 | inode = file->f_mapping->host; |
2915 | i_size = i_size_read(inode); | |
4273b793 | 2916 | |
6f673763 | 2917 | if ((iov_iter_rw(iter) == READ) && (offset > i_size)) |
9fe55eea SW |
2918 | return 0; |
2919 | ||
439ee5f0 | 2920 | /* optimization for short read */ |
6f673763 | 2921 | if (async_dio && iov_iter_rw(iter) != WRITE && offset + count > i_size) { |
439ee5f0 MP |
2922 | if (offset >= i_size) |
2923 | return 0; | |
5da784cc | 2924 | iov_iter_truncate(iter, fuse_round_up(ff->fc, i_size - offset)); |
6b775b18 | 2925 | count = iov_iter_count(iter); |
439ee5f0 MP |
2926 | } |
2927 | ||
bcba24cc | 2928 | io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL); |
36cf66ed MP |
2929 | if (!io) |
2930 | return -ENOMEM; | |
bcba24cc | 2931 | spin_lock_init(&io->lock); |
744742d6 | 2932 | kref_init(&io->refcnt); |
bcba24cc MP |
2933 | io->reqs = 1; |
2934 | io->bytes = -1; | |
2935 | io->size = 0; | |
2936 | io->offset = offset; | |
6f673763 | 2937 | io->write = (iov_iter_rw(iter) == WRITE); |
bcba24cc | 2938 | io->err = 0; |
bcba24cc MP |
2939 | /* |
2940 | * By default, we want to optimize all I/Os with async request | |
60b9df7a | 2941 | * submission to the client filesystem if supported. |
bcba24cc | 2942 | */ |
e5c5f05d | 2943 | io->async = async_dio; |
bcba24cc | 2944 | io->iocb = iocb; |
7879c4e5 | 2945 | io->blocking = is_sync_kiocb(iocb); |
bcba24cc MP |
2946 | |
2947 | /* | |
7879c4e5 AS |
2948 | * We cannot asynchronously extend the size of a file. |
2949 | * In such case the aio will behave exactly like sync io. | |
bcba24cc | 2950 | */ |
7879c4e5 AS |
2951 | if ((offset + count > i_size) && iov_iter_rw(iter) == WRITE) |
2952 | io->blocking = true; | |
4273b793 | 2953 | |
7879c4e5 | 2954 | if (io->async && io->blocking) { |
744742d6 SF |
2955 | /* |
2956 | * Additional reference to keep io around after | |
2957 | * calling fuse_aio_complete() | |
2958 | */ | |
2959 | kref_get(&io->refcnt); | |
9d5722b7 | 2960 | io->done = &wait; |
744742d6 | 2961 | } |
9d5722b7 | 2962 | |
6f673763 | 2963 | if (iov_iter_rw(iter) == WRITE) { |
6b775b18 | 2964 | ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE); |
812408fb AV |
2965 | fuse_invalidate_attr(inode); |
2966 | } else { | |
d22a943f | 2967 | ret = __fuse_direct_read(io, iter, &pos); |
812408fb | 2968 | } |
36cf66ed | 2969 | |
bcba24cc | 2970 | if (io->async) { |
ebacb812 LC |
2971 | bool blocking = io->blocking; |
2972 | ||
bcba24cc MP |
2973 | fuse_aio_complete(io, ret < 0 ? ret : 0, -1); |
2974 | ||
2975 | /* we have a non-extending, async request, so return */ | |
ebacb812 | 2976 | if (!blocking) |
bcba24cc MP |
2977 | return -EIOCBQUEUED; |
2978 | ||
9d5722b7 CH |
2979 | wait_for_completion(&wait); |
2980 | ret = fuse_get_res_by_io(io); | |
bcba24cc MP |
2981 | } |
2982 | ||
744742d6 | 2983 | kref_put(&io->refcnt, fuse_io_release); |
9d5722b7 | 2984 | |
6f673763 | 2985 | if (iov_iter_rw(iter) == WRITE) { |
efb9fa9e MP |
2986 | if (ret > 0) |
2987 | fuse_write_update_size(inode, pos); | |
2988 | else if (ret < 0 && offset + count > i_size) | |
2989 | fuse_do_truncate(file); | |
2990 | } | |
4273b793 AA |
2991 | |
2992 | return ret; | |
2993 | } | |
2994 | ||
cdadb11c MS |
2995 | static long fuse_file_fallocate(struct file *file, int mode, loff_t offset, |
2996 | loff_t length) | |
05ba1f08 AP |
2997 | { |
2998 | struct fuse_file *ff = file->private_data; | |
1c68271c | 2999 | struct inode *inode = file_inode(file); |
0ab08f57 | 3000 | struct fuse_inode *fi = get_fuse_inode(inode); |
05ba1f08 | 3001 | struct fuse_conn *fc = ff->fc; |
7078187a | 3002 | FUSE_ARGS(args); |
05ba1f08 AP |
3003 | struct fuse_fallocate_in inarg = { |
3004 | .fh = ff->fh, | |
3005 | .offset = offset, | |
3006 | .length = length, | |
3007 | .mode = mode | |
3008 | }; | |
3009 | int err; | |
14c14414 MP |
3010 | bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) || |
3011 | (mode & FALLOC_FL_PUNCH_HOLE); | |
05ba1f08 | 3012 | |
4adb8302 MS |
3013 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
3014 | return -EOPNOTSUPP; | |
3015 | ||
519c6040 MS |
3016 | if (fc->no_fallocate) |
3017 | return -EOPNOTSUPP; | |
3018 | ||
14c14414 | 3019 | if (lock_inode) { |
5955102c | 3020 | inode_lock(inode); |
bde52788 MP |
3021 | if (mode & FALLOC_FL_PUNCH_HOLE) { |
3022 | loff_t endbyte = offset + length - 1; | |
3023 | err = filemap_write_and_wait_range(inode->i_mapping, | |
3024 | offset, endbyte); | |
3025 | if (err) | |
3026 | goto out; | |
3027 | ||
3028 | fuse_sync_writes(inode); | |
3029 | } | |
3634a632 BF |
3030 | } |
3031 | ||
0ab08f57 MP |
3032 | if (!(mode & FALLOC_FL_KEEP_SIZE)) |
3033 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
3034 | ||
7078187a MS |
3035 | args.in.h.opcode = FUSE_FALLOCATE; |
3036 | args.in.h.nodeid = ff->nodeid; | |
3037 | args.in.numargs = 1; | |
3038 | args.in.args[0].size = sizeof(inarg); | |
3039 | args.in.args[0].value = &inarg; | |
3040 | err = fuse_simple_request(fc, &args); | |
519c6040 MS |
3041 | if (err == -ENOSYS) { |
3042 | fc->no_fallocate = 1; | |
3043 | err = -EOPNOTSUPP; | |
3044 | } | |
bee6c307 BF |
3045 | if (err) |
3046 | goto out; | |
3047 | ||
3048 | /* we could have extended the file */ | |
b0aa7606 MP |
3049 | if (!(mode & FALLOC_FL_KEEP_SIZE)) { |
3050 | bool changed = fuse_write_update_size(inode, offset + length); | |
3051 | ||
93d2269d MS |
3052 | if (changed && fc->writeback_cache) |
3053 | file_update_time(file); | |
b0aa7606 | 3054 | } |
bee6c307 BF |
3055 | |
3056 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
3057 | truncate_pagecache_range(inode, offset, offset + length - 1); | |
3058 | ||
3059 | fuse_invalidate_attr(inode); | |
3060 | ||
3634a632 | 3061 | out: |
0ab08f57 MP |
3062 | if (!(mode & FALLOC_FL_KEEP_SIZE)) |
3063 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
3064 | ||
bde52788 | 3065 | if (lock_inode) |
5955102c | 3066 | inode_unlock(inode); |
3634a632 | 3067 | |
05ba1f08 AP |
3068 | return err; |
3069 | } | |
05ba1f08 | 3070 | |
88bc7d50 NV |
3071 | static ssize_t fuse_copy_file_range(struct file *file_in, loff_t pos_in, |
3072 | struct file *file_out, loff_t pos_out, | |
3073 | size_t len, unsigned int flags) | |
3074 | { | |
3075 | struct fuse_file *ff_in = file_in->private_data; | |
3076 | struct fuse_file *ff_out = file_out->private_data; | |
3077 | struct inode *inode_out = file_inode(file_out); | |
3078 | struct fuse_inode *fi_out = get_fuse_inode(inode_out); | |
3079 | struct fuse_conn *fc = ff_in->fc; | |
3080 | FUSE_ARGS(args); | |
3081 | struct fuse_copy_file_range_in inarg = { | |
3082 | .fh_in = ff_in->fh, | |
3083 | .off_in = pos_in, | |
3084 | .nodeid_out = ff_out->nodeid, | |
3085 | .fh_out = ff_out->fh, | |
3086 | .off_out = pos_out, | |
3087 | .len = len, | |
3088 | .flags = flags | |
3089 | }; | |
3090 | struct fuse_write_out outarg; | |
3091 | ssize_t err; | |
3092 | /* mark unstable when write-back is not used, and file_out gets | |
3093 | * extended */ | |
3094 | bool is_unstable = (!fc->writeback_cache) && | |
3095 | ((pos_out + len) > inode_out->i_size); | |
3096 | ||
3097 | if (fc->no_copy_file_range) | |
3098 | return -EOPNOTSUPP; | |
3099 | ||
3100 | inode_lock(inode_out); | |
3101 | ||
3102 | if (fc->writeback_cache) { | |
3103 | err = filemap_write_and_wait_range(inode_out->i_mapping, | |
3104 | pos_out, pos_out + len); | |
3105 | if (err) | |
3106 | goto out; | |
3107 | ||
3108 | fuse_sync_writes(inode_out); | |
3109 | } | |
3110 | ||
3111 | if (is_unstable) | |
3112 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi_out->state); | |
3113 | ||
3114 | args.in.h.opcode = FUSE_COPY_FILE_RANGE; | |
3115 | args.in.h.nodeid = ff_in->nodeid; | |
3116 | args.in.numargs = 1; | |
3117 | args.in.args[0].size = sizeof(inarg); | |
3118 | args.in.args[0].value = &inarg; | |
3119 | args.out.numargs = 1; | |
3120 | args.out.args[0].size = sizeof(outarg); | |
3121 | args.out.args[0].value = &outarg; | |
3122 | err = fuse_simple_request(fc, &args); | |
3123 | if (err == -ENOSYS) { | |
3124 | fc->no_copy_file_range = 1; | |
3125 | err = -EOPNOTSUPP; | |
3126 | } | |
3127 | if (err) | |
3128 | goto out; | |
3129 | ||
3130 | if (fc->writeback_cache) { | |
3131 | fuse_write_update_size(inode_out, pos_out + outarg.size); | |
3132 | file_update_time(file_out); | |
3133 | } | |
3134 | ||
3135 | fuse_invalidate_attr(inode_out); | |
3136 | ||
3137 | err = outarg.size; | |
3138 | out: | |
3139 | if (is_unstable) | |
3140 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi_out->state); | |
3141 | ||
3142 | inode_unlock(inode_out); | |
3143 | ||
3144 | return err; | |
3145 | } | |
3146 | ||
4b6f5d20 | 3147 | static const struct file_operations fuse_file_operations = { |
5559b8f4 | 3148 | .llseek = fuse_file_llseek, |
37c20f16 | 3149 | .read_iter = fuse_file_read_iter, |
84c3d55c | 3150 | .write_iter = fuse_file_write_iter, |
b6aeaded MS |
3151 | .mmap = fuse_file_mmap, |
3152 | .open = fuse_open, | |
3153 | .flush = fuse_flush, | |
3154 | .release = fuse_release, | |
3155 | .fsync = fuse_fsync, | |
71421259 | 3156 | .lock = fuse_file_lock, |
a9ff4f87 | 3157 | .flock = fuse_file_flock, |
5ffc4ef4 | 3158 | .splice_read = generic_file_splice_read, |
3c3db095 | 3159 | .splice_write = iter_file_splice_write, |
59efec7b TH |
3160 | .unlocked_ioctl = fuse_file_ioctl, |
3161 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 3162 | .poll = fuse_file_poll, |
05ba1f08 | 3163 | .fallocate = fuse_file_fallocate, |
88bc7d50 | 3164 | .copy_file_range = fuse_copy_file_range, |
b6aeaded MS |
3165 | }; |
3166 | ||
4b6f5d20 | 3167 | static const struct file_operations fuse_direct_io_file_operations = { |
5559b8f4 | 3168 | .llseek = fuse_file_llseek, |
15316263 | 3169 | .read_iter = fuse_direct_read_iter, |
15316263 | 3170 | .write_iter = fuse_direct_write_iter, |
fc280c96 | 3171 | .mmap = fuse_direct_mmap, |
413ef8cb MS |
3172 | .open = fuse_open, |
3173 | .flush = fuse_flush, | |
3174 | .release = fuse_release, | |
3175 | .fsync = fuse_fsync, | |
71421259 | 3176 | .lock = fuse_file_lock, |
a9ff4f87 | 3177 | .flock = fuse_file_flock, |
3c3db095 MS |
3178 | .splice_read = generic_file_splice_read, |
3179 | .splice_write = iter_file_splice_write, | |
59efec7b TH |
3180 | .unlocked_ioctl = fuse_file_ioctl, |
3181 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 3182 | .poll = fuse_file_poll, |
05ba1f08 | 3183 | .fallocate = fuse_file_fallocate, |
d4136d60 | 3184 | .copy_file_range = fuse_copy_file_range, |
413ef8cb MS |
3185 | }; |
3186 | ||
f5e54d6e | 3187 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 3188 | .readpage = fuse_readpage, |
3be5a52b | 3189 | .writepage = fuse_writepage, |
26d614df | 3190 | .writepages = fuse_writepages, |
3be5a52b | 3191 | .launder_page = fuse_launder_page, |
db50b96c | 3192 | .readpages = fuse_readpages, |
3be5a52b | 3193 | .set_page_dirty = __set_page_dirty_nobuffers, |
b2d2272f | 3194 | .bmap = fuse_bmap, |
4273b793 | 3195 | .direct_IO = fuse_direct_IO, |
6b12c1b3 PE |
3196 | .write_begin = fuse_write_begin, |
3197 | .write_end = fuse_write_end, | |
b6aeaded MS |
3198 | }; |
3199 | ||
3200 | void fuse_init_file_inode(struct inode *inode) | |
3201 | { | |
ab2257e9 MS |
3202 | struct fuse_inode *fi = get_fuse_inode(inode); |
3203 | ||
45323fb7 MS |
3204 | inode->i_fop = &fuse_file_operations; |
3205 | inode->i_data.a_ops = &fuse_file_aops; | |
ab2257e9 MS |
3206 | |
3207 | INIT_LIST_HEAD(&fi->write_files); | |
3208 | INIT_LIST_HEAD(&fi->queued_writes); | |
3209 | fi->writectr = 0; | |
3210 | init_waitqueue_head(&fi->page_waitq); | |
3211 | INIT_LIST_HEAD(&fi->writepages); | |
b6aeaded | 3212 | } |