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Commit | Line | Data |
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b6aeaded MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
56cf34ff | 3 | Copyright (C) 2001-2006 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> |
b6aeaded | 15 | |
4b6f5d20 | 16 | static const struct file_operations fuse_direct_io_file_operations; |
45323fb7 | 17 | |
fd72faac MS |
18 | static int fuse_send_open(struct inode *inode, struct file *file, int isdir, |
19 | struct fuse_open_out *outargp) | |
b6aeaded MS |
20 | { |
21 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b6aeaded | 22 | struct fuse_open_in inarg; |
fd72faac MS |
23 | struct fuse_req *req; |
24 | int err; | |
25 | ||
ce1d5a49 MS |
26 | req = fuse_get_req(fc); |
27 | if (IS_ERR(req)) | |
28 | return PTR_ERR(req); | |
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; | |
fd72faac MS |
34 | req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; |
35 | req->in.h.nodeid = get_node_id(inode); | |
fd72faac MS |
36 | req->in.numargs = 1; |
37 | req->in.args[0].size = sizeof(inarg); | |
38 | req->in.args[0].value = &inarg; | |
39 | req->out.numargs = 1; | |
40 | req->out.args[0].size = sizeof(*outargp); | |
41 | req->out.args[0].value = outargp; | |
42 | request_send(fc, req); | |
43 | err = req->out.h.error; | |
44 | fuse_put_request(fc, req); | |
45 | ||
46 | return err; | |
47 | } | |
48 | ||
49 | struct fuse_file *fuse_file_alloc(void) | |
50 | { | |
51 | struct fuse_file *ff; | |
52 | ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); | |
53 | if (ff) { | |
33649c91 MS |
54 | ff->reserved_req = fuse_request_alloc(); |
55 | if (!ff->reserved_req) { | |
fd72faac MS |
56 | kfree(ff); |
57 | ff = NULL; | |
8744969a AB |
58 | } else { |
59 | INIT_LIST_HEAD(&ff->write_entry); | |
60 | atomic_set(&ff->count, 0); | |
fd72faac MS |
61 | } |
62 | } | |
63 | return ff; | |
64 | } | |
65 | ||
66 | void fuse_file_free(struct fuse_file *ff) | |
67 | { | |
33649c91 | 68 | fuse_request_free(ff->reserved_req); |
fd72faac MS |
69 | kfree(ff); |
70 | } | |
71 | ||
c756e0a4 MS |
72 | static struct fuse_file *fuse_file_get(struct fuse_file *ff) |
73 | { | |
74 | atomic_inc(&ff->count); | |
75 | return ff; | |
76 | } | |
77 | ||
819c4b3b MS |
78 | static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) |
79 | { | |
b57d4264 MS |
80 | dput(req->misc.release.dentry); |
81 | mntput(req->misc.release.vfsmount); | |
819c4b3b MS |
82 | fuse_put_request(fc, req); |
83 | } | |
84 | ||
c756e0a4 MS |
85 | static void fuse_file_put(struct fuse_file *ff) |
86 | { | |
87 | if (atomic_dec_and_test(&ff->count)) { | |
88 | struct fuse_req *req = ff->reserved_req; | |
b57d4264 MS |
89 | struct inode *inode = req->misc.release.dentry->d_inode; |
90 | struct fuse_conn *fc = get_fuse_conn(inode); | |
819c4b3b | 91 | req->end = fuse_release_end; |
c756e0a4 MS |
92 | request_send_background(fc, req); |
93 | kfree(ff); | |
94 | } | |
95 | } | |
96 | ||
fd72faac MS |
97 | void fuse_finish_open(struct inode *inode, struct file *file, |
98 | struct fuse_file *ff, struct fuse_open_out *outarg) | |
99 | { | |
100 | if (outarg->open_flags & FOPEN_DIRECT_IO) | |
101 | file->f_op = &fuse_direct_io_file_operations; | |
102 | if (!(outarg->open_flags & FOPEN_KEEP_CACHE)) | |
b1009979 | 103 | invalidate_inode_pages2(inode->i_mapping); |
fd72faac | 104 | ff->fh = outarg->fh; |
c756e0a4 | 105 | file->private_data = fuse_file_get(ff); |
fd72faac MS |
106 | } |
107 | ||
108 | int fuse_open_common(struct inode *inode, struct file *file, int isdir) | |
109 | { | |
b6aeaded MS |
110 | struct fuse_open_out outarg; |
111 | struct fuse_file *ff; | |
112 | int err; | |
b6aeaded | 113 | |
dd190d06 MS |
114 | /* VFS checks this, but only _after_ ->open() */ |
115 | if (file->f_flags & O_DIRECT) | |
116 | return -EINVAL; | |
117 | ||
b6aeaded MS |
118 | err = generic_file_open(inode, file); |
119 | if (err) | |
120 | return err; | |
121 | ||
fd72faac | 122 | ff = fuse_file_alloc(); |
b6aeaded | 123 | if (!ff) |
fd72faac | 124 | return -ENOMEM; |
b6aeaded | 125 | |
fd72faac MS |
126 | err = fuse_send_open(inode, file, isdir, &outarg); |
127 | if (err) | |
128 | fuse_file_free(ff); | |
129 | else { | |
130 | if (isdir) | |
131 | outarg.open_flags &= ~FOPEN_DIRECT_IO; | |
132 | fuse_finish_open(inode, file, ff, &outarg); | |
b6aeaded MS |
133 | } |
134 | ||
b6aeaded MS |
135 | return err; |
136 | } | |
137 | ||
c756e0a4 | 138 | void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode) |
64c6d8ed | 139 | { |
33649c91 | 140 | struct fuse_req *req = ff->reserved_req; |
b57d4264 | 141 | struct fuse_release_in *inarg = &req->misc.release.in; |
b6aeaded MS |
142 | |
143 | inarg->fh = ff->fh; | |
fd72faac | 144 | inarg->flags = flags; |
51eb01e7 | 145 | req->in.h.opcode = opcode; |
fd72faac | 146 | req->in.h.nodeid = nodeid; |
b6aeaded MS |
147 | req->in.numargs = 1; |
148 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
149 | req->in.args[0].value = inarg; | |
fd72faac MS |
150 | } |
151 | ||
152 | int fuse_release_common(struct inode *inode, struct file *file, int isdir) | |
153 | { | |
154 | struct fuse_file *ff = file->private_data; | |
155 | if (ff) { | |
93a8c3cd | 156 | struct fuse_conn *fc = get_fuse_conn(inode); |
b57d4264 | 157 | struct fuse_req *req = ff->reserved_req; |
93a8c3cd | 158 | |
c756e0a4 MS |
159 | fuse_release_fill(ff, get_node_id(inode), file->f_flags, |
160 | isdir ? FUSE_RELEASEDIR : FUSE_RELEASE); | |
51eb01e7 MS |
161 | |
162 | /* Hold vfsmount and dentry until release is finished */ | |
b57d4264 MS |
163 | req->misc.release.vfsmount = mntget(file->f_path.mnt); |
164 | req->misc.release.dentry = dget(file->f_path.dentry); | |
93a8c3cd MS |
165 | |
166 | spin_lock(&fc->lock); | |
167 | list_del(&ff->write_entry); | |
168 | spin_unlock(&fc->lock); | |
c756e0a4 MS |
169 | /* |
170 | * Normally this will send the RELEASE request, | |
171 | * however if some asynchronous READ or WRITE requests | |
172 | * are outstanding, the sending will be delayed | |
173 | */ | |
174 | fuse_file_put(ff); | |
fd72faac | 175 | } |
b6aeaded MS |
176 | |
177 | /* Return value is ignored by VFS */ | |
178 | return 0; | |
179 | } | |
180 | ||
04730fef MS |
181 | static int fuse_open(struct inode *inode, struct file *file) |
182 | { | |
183 | return fuse_open_common(inode, file, 0); | |
184 | } | |
185 | ||
186 | static int fuse_release(struct inode *inode, struct file *file) | |
187 | { | |
188 | return fuse_release_common(inode, file, 0); | |
189 | } | |
190 | ||
71421259 | 191 | /* |
9c8ef561 MS |
192 | * Scramble the ID space with XTEA, so that the value of the files_struct |
193 | * pointer is not exposed to userspace. | |
71421259 | 194 | */ |
f3332114 | 195 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 196 | { |
9c8ef561 MS |
197 | u32 *k = fc->scramble_key; |
198 | u64 v = (unsigned long) id; | |
199 | u32 v0 = v; | |
200 | u32 v1 = v >> 32; | |
201 | u32 sum = 0; | |
202 | int i; | |
203 | ||
204 | for (i = 0; i < 32; i++) { | |
205 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
206 | sum += 0x9E3779B9; | |
207 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
208 | } | |
209 | ||
210 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
211 | } |
212 | ||
3be5a52b MS |
213 | /* |
214 | * Check if page is under writeback | |
215 | * | |
216 | * This is currently done by walking the list of writepage requests | |
217 | * for the inode, which can be pretty inefficient. | |
218 | */ | |
219 | static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) | |
220 | { | |
221 | struct fuse_conn *fc = get_fuse_conn(inode); | |
222 | struct fuse_inode *fi = get_fuse_inode(inode); | |
223 | struct fuse_req *req; | |
224 | bool found = false; | |
225 | ||
226 | spin_lock(&fc->lock); | |
227 | list_for_each_entry(req, &fi->writepages, writepages_entry) { | |
228 | pgoff_t curr_index; | |
229 | ||
230 | BUG_ON(req->inode != inode); | |
231 | curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT; | |
232 | if (curr_index == index) { | |
233 | found = true; | |
234 | break; | |
235 | } | |
236 | } | |
237 | spin_unlock(&fc->lock); | |
238 | ||
239 | return found; | |
240 | } | |
241 | ||
242 | /* | |
243 | * Wait for page writeback to be completed. | |
244 | * | |
245 | * Since fuse doesn't rely on the VM writeback tracking, this has to | |
246 | * use some other means. | |
247 | */ | |
248 | static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) | |
249 | { | |
250 | struct fuse_inode *fi = get_fuse_inode(inode); | |
251 | ||
252 | wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); | |
253 | return 0; | |
254 | } | |
255 | ||
75e1fcc0 | 256 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 257 | { |
7706a9d6 | 258 | struct inode *inode = file->f_path.dentry->d_inode; |
b6aeaded MS |
259 | struct fuse_conn *fc = get_fuse_conn(inode); |
260 | struct fuse_file *ff = file->private_data; | |
261 | struct fuse_req *req; | |
262 | struct fuse_flush_in inarg; | |
263 | int err; | |
264 | ||
248d86e8 MS |
265 | if (is_bad_inode(inode)) |
266 | return -EIO; | |
267 | ||
b6aeaded MS |
268 | if (fc->no_flush) |
269 | return 0; | |
270 | ||
33649c91 | 271 | req = fuse_get_req_nofail(fc, file); |
b6aeaded MS |
272 | memset(&inarg, 0, sizeof(inarg)); |
273 | inarg.fh = ff->fh; | |
9c8ef561 | 274 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
275 | req->in.h.opcode = FUSE_FLUSH; |
276 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
277 | req->in.numargs = 1; |
278 | req->in.args[0].size = sizeof(inarg); | |
279 | req->in.args[0].value = &inarg; | |
71421259 | 280 | req->force = 1; |
7c352bdf | 281 | request_send(fc, req); |
b6aeaded MS |
282 | err = req->out.h.error; |
283 | fuse_put_request(fc, req); | |
284 | if (err == -ENOSYS) { | |
285 | fc->no_flush = 1; | |
286 | err = 0; | |
287 | } | |
288 | return err; | |
289 | } | |
290 | ||
3be5a52b MS |
291 | /* |
292 | * Wait for all pending writepages on the inode to finish. | |
293 | * | |
294 | * This is currently done by blocking further writes with FUSE_NOWRITE | |
295 | * and waiting for all sent writes to complete. | |
296 | * | |
297 | * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage | |
298 | * could conflict with truncation. | |
299 | */ | |
300 | static void fuse_sync_writes(struct inode *inode) | |
301 | { | |
302 | fuse_set_nowrite(inode); | |
303 | fuse_release_nowrite(inode); | |
304 | } | |
305 | ||
82547981 MS |
306 | int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, |
307 | int isdir) | |
b6aeaded MS |
308 | { |
309 | struct inode *inode = de->d_inode; | |
310 | struct fuse_conn *fc = get_fuse_conn(inode); | |
311 | struct fuse_file *ff = file->private_data; | |
312 | struct fuse_req *req; | |
313 | struct fuse_fsync_in inarg; | |
314 | int err; | |
315 | ||
248d86e8 MS |
316 | if (is_bad_inode(inode)) |
317 | return -EIO; | |
318 | ||
82547981 | 319 | if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) |
b6aeaded MS |
320 | return 0; |
321 | ||
3be5a52b MS |
322 | /* |
323 | * Start writeback against all dirty pages of the inode, then | |
324 | * wait for all outstanding writes, before sending the FSYNC | |
325 | * request. | |
326 | */ | |
327 | err = write_inode_now(inode, 0); | |
328 | if (err) | |
329 | return err; | |
330 | ||
331 | fuse_sync_writes(inode); | |
332 | ||
ce1d5a49 MS |
333 | req = fuse_get_req(fc); |
334 | if (IS_ERR(req)) | |
335 | return PTR_ERR(req); | |
b6aeaded MS |
336 | |
337 | memset(&inarg, 0, sizeof(inarg)); | |
338 | inarg.fh = ff->fh; | |
339 | inarg.fsync_flags = datasync ? 1 : 0; | |
82547981 | 340 | req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC; |
b6aeaded | 341 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
342 | req->in.numargs = 1; |
343 | req->in.args[0].size = sizeof(inarg); | |
344 | req->in.args[0].value = &inarg; | |
345 | request_send(fc, req); | |
346 | err = req->out.h.error; | |
347 | fuse_put_request(fc, req); | |
348 | if (err == -ENOSYS) { | |
82547981 MS |
349 | if (isdir) |
350 | fc->no_fsyncdir = 1; | |
351 | else | |
352 | fc->no_fsync = 1; | |
b6aeaded MS |
353 | err = 0; |
354 | } | |
355 | return err; | |
356 | } | |
357 | ||
82547981 MS |
358 | static int fuse_fsync(struct file *file, struct dentry *de, int datasync) |
359 | { | |
360 | return fuse_fsync_common(file, de, datasync, 0); | |
361 | } | |
362 | ||
a6643094 | 363 | void fuse_read_fill(struct fuse_req *req, struct file *file, |
361b1eb5 | 364 | struct inode *inode, loff_t pos, size_t count, int opcode) |
b6aeaded | 365 | { |
361b1eb5 | 366 | struct fuse_read_in *inarg = &req->misc.read_in; |
a6643094 | 367 | struct fuse_file *ff = file->private_data; |
b6aeaded | 368 | |
361b1eb5 MS |
369 | inarg->fh = ff->fh; |
370 | inarg->offset = pos; | |
371 | inarg->size = count; | |
a6643094 | 372 | inarg->flags = file->f_flags; |
361b1eb5 | 373 | req->in.h.opcode = opcode; |
b6aeaded | 374 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
375 | req->in.numargs = 1; |
376 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 377 | req->in.args[0].value = inarg; |
b6aeaded MS |
378 | req->out.argpages = 1; |
379 | req->out.argvar = 1; | |
380 | req->out.numargs = 1; | |
381 | req->out.args[0].size = count; | |
b6aeaded MS |
382 | } |
383 | ||
8bfc016d | 384 | static size_t fuse_send_read(struct fuse_req *req, struct file *file, |
f3332114 MS |
385 | struct inode *inode, loff_t pos, size_t count, |
386 | fl_owner_t owner) | |
04730fef | 387 | { |
361b1eb5 | 388 | struct fuse_conn *fc = get_fuse_conn(inode); |
f3332114 | 389 | |
a6643094 | 390 | fuse_read_fill(req, file, inode, pos, count, FUSE_READ); |
f3332114 MS |
391 | if (owner != NULL) { |
392 | struct fuse_read_in *inarg = &req->misc.read_in; | |
393 | ||
394 | inarg->read_flags |= FUSE_READ_LOCKOWNER; | |
395 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
396 | } | |
361b1eb5 MS |
397 | request_send(fc, req); |
398 | return req->out.args[0].size; | |
04730fef MS |
399 | } |
400 | ||
b6aeaded MS |
401 | static int fuse_readpage(struct file *file, struct page *page) |
402 | { | |
403 | struct inode *inode = page->mapping->host; | |
404 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 MS |
405 | struct fuse_req *req; |
406 | int err; | |
407 | ||
408 | err = -EIO; | |
409 | if (is_bad_inode(inode)) | |
410 | goto out; | |
411 | ||
3be5a52b MS |
412 | /* |
413 | * Page writeback can extend beyond the liftime of the | |
414 | * page-cache page, so make sure we read a properly synced | |
415 | * page. | |
416 | */ | |
417 | fuse_wait_on_page_writeback(inode, page->index); | |
418 | ||
ce1d5a49 MS |
419 | req = fuse_get_req(fc); |
420 | err = PTR_ERR(req); | |
421 | if (IS_ERR(req)) | |
b6aeaded MS |
422 | goto out; |
423 | ||
424 | req->out.page_zeroing = 1; | |
425 | req->num_pages = 1; | |
426 | req->pages[0] = page; | |
f3332114 MS |
427 | fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE, |
428 | NULL); | |
b6aeaded MS |
429 | err = req->out.h.error; |
430 | fuse_put_request(fc, req); | |
431 | if (!err) | |
432 | SetPageUptodate(page); | |
b36c31ba | 433 | fuse_invalidate_attr(inode); /* atime changed */ |
b6aeaded MS |
434 | out: |
435 | unlock_page(page); | |
436 | return err; | |
437 | } | |
438 | ||
c1aa96a5 | 439 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 440 | { |
c1aa96a5 MS |
441 | int i; |
442 | ||
443 | fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */ | |
444 | ||
db50b96c MS |
445 | for (i = 0; i < req->num_pages; i++) { |
446 | struct page *page = req->pages[i]; | |
447 | if (!req->out.h.error) | |
448 | SetPageUptodate(page); | |
c1aa96a5 MS |
449 | else |
450 | SetPageError(page); | |
db50b96c MS |
451 | unlock_page(page); |
452 | } | |
c756e0a4 MS |
453 | if (req->ff) |
454 | fuse_file_put(req->ff); | |
c1aa96a5 MS |
455 | fuse_put_request(fc, req); |
456 | } | |
457 | ||
a6643094 | 458 | static void fuse_send_readpages(struct fuse_req *req, struct file *file, |
c1aa96a5 MS |
459 | struct inode *inode) |
460 | { | |
461 | struct fuse_conn *fc = get_fuse_conn(inode); | |
462 | loff_t pos = page_offset(req->pages[0]); | |
463 | size_t count = req->num_pages << PAGE_CACHE_SHIFT; | |
464 | req->out.page_zeroing = 1; | |
a6643094 | 465 | fuse_read_fill(req, file, inode, pos, count, FUSE_READ); |
9cd68455 | 466 | if (fc->async_read) { |
a6643094 | 467 | struct fuse_file *ff = file->private_data; |
c756e0a4 | 468 | req->ff = fuse_file_get(ff); |
9cd68455 MS |
469 | req->end = fuse_readpages_end; |
470 | request_send_background(fc, req); | |
471 | } else { | |
472 | request_send(fc, req); | |
473 | fuse_readpages_end(fc, req); | |
474 | } | |
db50b96c MS |
475 | } |
476 | ||
c756e0a4 | 477 | struct fuse_fill_data { |
db50b96c | 478 | struct fuse_req *req; |
a6643094 | 479 | struct file *file; |
db50b96c MS |
480 | struct inode *inode; |
481 | }; | |
482 | ||
483 | static int fuse_readpages_fill(void *_data, struct page *page) | |
484 | { | |
c756e0a4 | 485 | struct fuse_fill_data *data = _data; |
db50b96c MS |
486 | struct fuse_req *req = data->req; |
487 | struct inode *inode = data->inode; | |
488 | struct fuse_conn *fc = get_fuse_conn(inode); | |
489 | ||
3be5a52b MS |
490 | fuse_wait_on_page_writeback(inode, page->index); |
491 | ||
db50b96c MS |
492 | if (req->num_pages && |
493 | (req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
494 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || | |
495 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { | |
a6643094 | 496 | fuse_send_readpages(req, data->file, inode); |
ce1d5a49 MS |
497 | data->req = req = fuse_get_req(fc); |
498 | if (IS_ERR(req)) { | |
db50b96c | 499 | unlock_page(page); |
ce1d5a49 | 500 | return PTR_ERR(req); |
db50b96c | 501 | } |
db50b96c MS |
502 | } |
503 | req->pages[req->num_pages] = page; | |
504 | req->num_pages ++; | |
505 | return 0; | |
506 | } | |
507 | ||
508 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
509 | struct list_head *pages, unsigned nr_pages) | |
510 | { | |
511 | struct inode *inode = mapping->host; | |
512 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 513 | struct fuse_fill_data data; |
db50b96c | 514 | int err; |
248d86e8 | 515 | |
1d7ea732 | 516 | err = -EIO; |
248d86e8 | 517 | if (is_bad_inode(inode)) |
2e990021 | 518 | goto out; |
248d86e8 | 519 | |
a6643094 | 520 | data.file = file; |
db50b96c | 521 | data.inode = inode; |
ce1d5a49 | 522 | data.req = fuse_get_req(fc); |
1d7ea732 | 523 | err = PTR_ERR(data.req); |
ce1d5a49 | 524 | if (IS_ERR(data.req)) |
2e990021 | 525 | goto out; |
db50b96c MS |
526 | |
527 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
528 | if (!err) { |
529 | if (data.req->num_pages) | |
a6643094 | 530 | fuse_send_readpages(data.req, file, inode); |
d3406ffa MS |
531 | else |
532 | fuse_put_request(fc, data.req); | |
533 | } | |
2e990021 | 534 | out: |
1d7ea732 | 535 | return err; |
db50b96c MS |
536 | } |
537 | ||
bcb4be80 MS |
538 | static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
539 | unsigned long nr_segs, loff_t pos) | |
540 | { | |
541 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
542 | ||
543 | if (pos + iov_length(iov, nr_segs) > i_size_read(inode)) { | |
544 | int err; | |
545 | /* | |
546 | * If trying to read past EOF, make sure the i_size | |
547 | * attribute is up-to-date. | |
548 | */ | |
549 | err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL); | |
550 | if (err) | |
551 | return err; | |
552 | } | |
553 | ||
554 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
555 | } | |
556 | ||
a6643094 | 557 | static void fuse_write_fill(struct fuse_req *req, struct file *file, |
3be5a52b MS |
558 | struct fuse_file *ff, struct inode *inode, |
559 | loff_t pos, size_t count, int writepage) | |
b6aeaded | 560 | { |
f3332114 | 561 | struct fuse_conn *fc = get_fuse_conn(inode); |
b25e82e5 MS |
562 | struct fuse_write_in *inarg = &req->misc.write.in; |
563 | struct fuse_write_out *outarg = &req->misc.write.out; | |
b6aeaded | 564 | |
b25e82e5 MS |
565 | memset(inarg, 0, sizeof(struct fuse_write_in)); |
566 | inarg->fh = ff->fh; | |
567 | inarg->offset = pos; | |
568 | inarg->size = count; | |
569 | inarg->write_flags = writepage ? FUSE_WRITE_CACHE : 0; | |
3be5a52b | 570 | inarg->flags = file ? file->f_flags : 0; |
b6aeaded MS |
571 | req->in.h.opcode = FUSE_WRITE; |
572 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
573 | req->in.argpages = 1; |
574 | req->in.numargs = 2; | |
f3332114 MS |
575 | if (fc->minor < 9) |
576 | req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; | |
577 | else | |
578 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
b25e82e5 | 579 | req->in.args[0].value = inarg; |
b6aeaded MS |
580 | req->in.args[1].size = count; |
581 | req->out.numargs = 1; | |
582 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
b25e82e5 MS |
583 | req->out.args[0].value = outarg; |
584 | } | |
585 | ||
586 | static size_t fuse_send_write(struct fuse_req *req, struct file *file, | |
f3332114 MS |
587 | struct inode *inode, loff_t pos, size_t count, |
588 | fl_owner_t owner) | |
b25e82e5 MS |
589 | { |
590 | struct fuse_conn *fc = get_fuse_conn(inode); | |
3be5a52b | 591 | fuse_write_fill(req, file, file->private_data, inode, pos, count, 0); |
f3332114 MS |
592 | if (owner != NULL) { |
593 | struct fuse_write_in *inarg = &req->misc.write.in; | |
594 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; | |
595 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
596 | } | |
7c352bdf | 597 | request_send(fc, req); |
b25e82e5 | 598 | return req->misc.write.out.size; |
b6aeaded MS |
599 | } |
600 | ||
5e6f58a1 NP |
601 | static int fuse_write_begin(struct file *file, struct address_space *mapping, |
602 | loff_t pos, unsigned len, unsigned flags, | |
603 | struct page **pagep, void **fsdata) | |
b6aeaded | 604 | { |
5e6f58a1 NP |
605 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
606 | ||
607 | *pagep = __grab_cache_page(mapping, index); | |
608 | if (!*pagep) | |
609 | return -ENOMEM; | |
b6aeaded MS |
610 | return 0; |
611 | } | |
612 | ||
5e6f58a1 NP |
613 | static int fuse_buffered_write(struct file *file, struct inode *inode, |
614 | loff_t pos, unsigned count, struct page *page) | |
b6aeaded MS |
615 | { |
616 | int err; | |
04730fef | 617 | size_t nres; |
b6aeaded | 618 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 | 619 | struct fuse_inode *fi = get_fuse_inode(inode); |
5e6f58a1 | 620 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
248d86e8 MS |
621 | struct fuse_req *req; |
622 | ||
623 | if (is_bad_inode(inode)) | |
624 | return -EIO; | |
625 | ||
3be5a52b MS |
626 | /* |
627 | * Make sure writepages on the same page are not mixed up with | |
628 | * plain writes. | |
629 | */ | |
630 | fuse_wait_on_page_writeback(inode, page->index); | |
631 | ||
ce1d5a49 MS |
632 | req = fuse_get_req(fc); |
633 | if (IS_ERR(req)) | |
634 | return PTR_ERR(req); | |
b6aeaded MS |
635 | |
636 | req->num_pages = 1; | |
637 | req->pages[0] = page; | |
638 | req->page_offset = offset; | |
f3332114 | 639 | nres = fuse_send_write(req, file, inode, pos, count, NULL); |
b6aeaded MS |
640 | err = req->out.h.error; |
641 | fuse_put_request(fc, req); | |
5e6f58a1 | 642 | if (!err && !nres) |
b6aeaded MS |
643 | err = -EIO; |
644 | if (!err) { | |
5e6f58a1 | 645 | pos += nres; |
9ffbb916 | 646 | spin_lock(&fc->lock); |
1fb69e78 | 647 | fi->attr_version = ++fc->attr_version; |
9ffbb916 | 648 | if (pos > inode->i_size) |
b6aeaded | 649 | i_size_write(inode, pos); |
9ffbb916 | 650 | spin_unlock(&fc->lock); |
b6aeaded | 651 | |
5e6f58a1 | 652 | if (count == PAGE_CACHE_SIZE) |
b6aeaded | 653 | SetPageUptodate(page); |
b36c31ba MS |
654 | } |
655 | fuse_invalidate_attr(inode); | |
5e6f58a1 NP |
656 | return err ? err : nres; |
657 | } | |
658 | ||
659 | static int fuse_write_end(struct file *file, struct address_space *mapping, | |
660 | loff_t pos, unsigned len, unsigned copied, | |
661 | struct page *page, void *fsdata) | |
662 | { | |
663 | struct inode *inode = mapping->host; | |
664 | int res = 0; | |
665 | ||
666 | if (copied) | |
667 | res = fuse_buffered_write(file, inode, pos, copied, page); | |
668 | ||
669 | unlock_page(page); | |
670 | page_cache_release(page); | |
671 | return res; | |
b6aeaded MS |
672 | } |
673 | ||
413ef8cb MS |
674 | static void fuse_release_user_pages(struct fuse_req *req, int write) |
675 | { | |
676 | unsigned i; | |
677 | ||
678 | for (i = 0; i < req->num_pages; i++) { | |
679 | struct page *page = req->pages[i]; | |
680 | if (write) | |
681 | set_page_dirty_lock(page); | |
682 | put_page(page); | |
683 | } | |
684 | } | |
685 | ||
686 | static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, | |
687 | unsigned nbytes, int write) | |
688 | { | |
689 | unsigned long user_addr = (unsigned long) buf; | |
690 | unsigned offset = user_addr & ~PAGE_MASK; | |
691 | int npages; | |
692 | ||
693 | /* This doesn't work with nfsd */ | |
694 | if (!current->mm) | |
695 | return -EPERM; | |
696 | ||
697 | nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); | |
698 | npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
6ad84aca | 699 | npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ); |
413ef8cb MS |
700 | down_read(¤t->mm->mmap_sem); |
701 | npages = get_user_pages(current, current->mm, user_addr, npages, write, | |
702 | 0, req->pages, NULL); | |
703 | up_read(¤t->mm->mmap_sem); | |
704 | if (npages < 0) | |
705 | return npages; | |
706 | ||
707 | req->num_pages = npages; | |
708 | req->page_offset = offset; | |
709 | return 0; | |
710 | } | |
711 | ||
712 | static ssize_t fuse_direct_io(struct file *file, const char __user *buf, | |
713 | size_t count, loff_t *ppos, int write) | |
714 | { | |
7706a9d6 | 715 | struct inode *inode = file->f_path.dentry->d_inode; |
413ef8cb MS |
716 | struct fuse_conn *fc = get_fuse_conn(inode); |
717 | size_t nmax = write ? fc->max_write : fc->max_read; | |
718 | loff_t pos = *ppos; | |
719 | ssize_t res = 0; | |
248d86e8 MS |
720 | struct fuse_req *req; |
721 | ||
722 | if (is_bad_inode(inode)) | |
723 | return -EIO; | |
724 | ||
ce1d5a49 MS |
725 | req = fuse_get_req(fc); |
726 | if (IS_ERR(req)) | |
727 | return PTR_ERR(req); | |
413ef8cb MS |
728 | |
729 | while (count) { | |
413ef8cb MS |
730 | size_t nres; |
731 | size_t nbytes = min(count, nmax); | |
732 | int err = fuse_get_user_pages(req, buf, nbytes, !write); | |
733 | if (err) { | |
734 | res = err; | |
735 | break; | |
736 | } | |
6ad84aca MS |
737 | nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset; |
738 | nbytes = min(count, nbytes); | |
413ef8cb | 739 | if (write) |
f3332114 MS |
740 | nres = fuse_send_write(req, file, inode, pos, nbytes, |
741 | current->files); | |
413ef8cb | 742 | else |
f3332114 MS |
743 | nres = fuse_send_read(req, file, inode, pos, nbytes, |
744 | current->files); | |
413ef8cb MS |
745 | fuse_release_user_pages(req, !write); |
746 | if (req->out.h.error) { | |
747 | if (!res) | |
748 | res = req->out.h.error; | |
749 | break; | |
750 | } else if (nres > nbytes) { | |
751 | res = -EIO; | |
752 | break; | |
753 | } | |
754 | count -= nres; | |
755 | res += nres; | |
756 | pos += nres; | |
757 | buf += nres; | |
758 | if (nres != nbytes) | |
759 | break; | |
56cf34ff MS |
760 | if (count) { |
761 | fuse_put_request(fc, req); | |
762 | req = fuse_get_req(fc); | |
763 | if (IS_ERR(req)) | |
764 | break; | |
765 | } | |
413ef8cb MS |
766 | } |
767 | fuse_put_request(fc, req); | |
768 | if (res > 0) { | |
9ffbb916 MS |
769 | if (write) { |
770 | spin_lock(&fc->lock); | |
771 | if (pos > inode->i_size) | |
772 | i_size_write(inode, pos); | |
773 | spin_unlock(&fc->lock); | |
774 | } | |
413ef8cb | 775 | *ppos = pos; |
b36c31ba MS |
776 | } |
777 | fuse_invalidate_attr(inode); | |
413ef8cb MS |
778 | |
779 | return res; | |
780 | } | |
781 | ||
782 | static ssize_t fuse_direct_read(struct file *file, char __user *buf, | |
783 | size_t count, loff_t *ppos) | |
784 | { | |
785 | return fuse_direct_io(file, buf, count, ppos, 0); | |
786 | } | |
787 | ||
788 | static ssize_t fuse_direct_write(struct file *file, const char __user *buf, | |
789 | size_t count, loff_t *ppos) | |
790 | { | |
7706a9d6 | 791 | struct inode *inode = file->f_path.dentry->d_inode; |
413ef8cb MS |
792 | ssize_t res; |
793 | /* Don't allow parallel writes to the same file */ | |
1b1dcc1b | 794 | mutex_lock(&inode->i_mutex); |
889f7848 MS |
795 | res = generic_write_checks(file, ppos, &count, 0); |
796 | if (!res) | |
797 | res = fuse_direct_io(file, buf, count, ppos, 1); | |
1b1dcc1b | 798 | mutex_unlock(&inode->i_mutex); |
413ef8cb MS |
799 | return res; |
800 | } | |
801 | ||
3be5a52b | 802 | static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req) |
b6aeaded | 803 | { |
3be5a52b MS |
804 | __free_page(req->pages[0]); |
805 | fuse_file_put(req->ff); | |
806 | fuse_put_request(fc, req); | |
807 | } | |
808 | ||
809 | static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) | |
810 | { | |
811 | struct inode *inode = req->inode; | |
812 | struct fuse_inode *fi = get_fuse_inode(inode); | |
813 | struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info; | |
814 | ||
815 | list_del(&req->writepages_entry); | |
816 | dec_bdi_stat(bdi, BDI_WRITEBACK); | |
817 | dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP); | |
818 | bdi_writeout_inc(bdi); | |
819 | wake_up(&fi->page_waitq); | |
820 | } | |
821 | ||
822 | /* Called under fc->lock, may release and reacquire it */ | |
823 | static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req) | |
824 | { | |
825 | struct fuse_inode *fi = get_fuse_inode(req->inode); | |
826 | loff_t size = i_size_read(req->inode); | |
827 | struct fuse_write_in *inarg = &req->misc.write.in; | |
828 | ||
829 | if (!fc->connected) | |
830 | goto out_free; | |
831 | ||
832 | if (inarg->offset + PAGE_CACHE_SIZE <= size) { | |
833 | inarg->size = PAGE_CACHE_SIZE; | |
834 | } else if (inarg->offset < size) { | |
835 | inarg->size = size & (PAGE_CACHE_SIZE - 1); | |
836 | } else { | |
837 | /* Got truncated off completely */ | |
838 | goto out_free; | |
b6aeaded | 839 | } |
3be5a52b MS |
840 | |
841 | req->in.args[1].size = inarg->size; | |
842 | fi->writectr++; | |
843 | request_send_background_locked(fc, req); | |
844 | return; | |
845 | ||
846 | out_free: | |
847 | fuse_writepage_finish(fc, req); | |
848 | spin_unlock(&fc->lock); | |
849 | fuse_writepage_free(fc, req); | |
850 | spin_lock(&fc->lock); | |
b6aeaded MS |
851 | } |
852 | ||
3be5a52b MS |
853 | /* |
854 | * If fi->writectr is positive (no truncate or fsync going on) send | |
855 | * all queued writepage requests. | |
856 | * | |
857 | * Called with fc->lock | |
858 | */ | |
859 | void fuse_flush_writepages(struct inode *inode) | |
b6aeaded | 860 | { |
3be5a52b MS |
861 | struct fuse_conn *fc = get_fuse_conn(inode); |
862 | struct fuse_inode *fi = get_fuse_inode(inode); | |
863 | struct fuse_req *req; | |
864 | ||
865 | while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { | |
866 | req = list_entry(fi->queued_writes.next, struct fuse_req, list); | |
867 | list_del_init(&req->list); | |
868 | fuse_send_writepage(fc, req); | |
869 | } | |
870 | } | |
871 | ||
872 | static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req) | |
873 | { | |
874 | struct inode *inode = req->inode; | |
875 | struct fuse_inode *fi = get_fuse_inode(inode); | |
876 | ||
877 | mapping_set_error(inode->i_mapping, req->out.h.error); | |
878 | spin_lock(&fc->lock); | |
879 | fi->writectr--; | |
880 | fuse_writepage_finish(fc, req); | |
881 | spin_unlock(&fc->lock); | |
882 | fuse_writepage_free(fc, req); | |
883 | } | |
884 | ||
885 | static int fuse_writepage_locked(struct page *page) | |
886 | { | |
887 | struct address_space *mapping = page->mapping; | |
888 | struct inode *inode = mapping->host; | |
889 | struct fuse_conn *fc = get_fuse_conn(inode); | |
890 | struct fuse_inode *fi = get_fuse_inode(inode); | |
891 | struct fuse_req *req; | |
892 | struct fuse_file *ff; | |
893 | struct page *tmp_page; | |
894 | ||
895 | set_page_writeback(page); | |
896 | ||
897 | req = fuse_request_alloc_nofs(); | |
898 | if (!req) | |
899 | goto err; | |
900 | ||
901 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
902 | if (!tmp_page) | |
903 | goto err_free; | |
904 | ||
905 | spin_lock(&fc->lock); | |
906 | BUG_ON(list_empty(&fi->write_files)); | |
907 | ff = list_entry(fi->write_files.next, struct fuse_file, write_entry); | |
908 | req->ff = fuse_file_get(ff); | |
909 | spin_unlock(&fc->lock); | |
910 | ||
911 | fuse_write_fill(req, NULL, ff, inode, page_offset(page), 0, 1); | |
912 | ||
913 | copy_highpage(tmp_page, page); | |
914 | req->num_pages = 1; | |
915 | req->pages[0] = tmp_page; | |
916 | req->page_offset = 0; | |
917 | req->end = fuse_writepage_end; | |
918 | req->inode = inode; | |
919 | ||
920 | inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK); | |
921 | inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); | |
922 | end_page_writeback(page); | |
923 | ||
924 | spin_lock(&fc->lock); | |
925 | list_add(&req->writepages_entry, &fi->writepages); | |
926 | list_add_tail(&req->list, &fi->queued_writes); | |
927 | fuse_flush_writepages(inode); | |
928 | spin_unlock(&fc->lock); | |
929 | ||
930 | return 0; | |
931 | ||
932 | err_free: | |
933 | fuse_request_free(req); | |
934 | err: | |
935 | end_page_writeback(page); | |
936 | return -ENOMEM; | |
937 | } | |
938 | ||
939 | static int fuse_writepage(struct page *page, struct writeback_control *wbc) | |
940 | { | |
941 | int err; | |
942 | ||
943 | err = fuse_writepage_locked(page); | |
944 | unlock_page(page); | |
945 | ||
946 | return err; | |
947 | } | |
948 | ||
949 | static int fuse_launder_page(struct page *page) | |
950 | { | |
951 | int err = 0; | |
952 | if (clear_page_dirty_for_io(page)) { | |
953 | struct inode *inode = page->mapping->host; | |
954 | err = fuse_writepage_locked(page); | |
955 | if (!err) | |
956 | fuse_wait_on_page_writeback(inode, page->index); | |
957 | } | |
958 | return err; | |
959 | } | |
960 | ||
961 | /* | |
962 | * Write back dirty pages now, because there may not be any suitable | |
963 | * open files later | |
964 | */ | |
965 | static void fuse_vma_close(struct vm_area_struct *vma) | |
966 | { | |
967 | filemap_write_and_wait(vma->vm_file->f_mapping); | |
968 | } | |
969 | ||
970 | /* | |
971 | * Wait for writeback against this page to complete before allowing it | |
972 | * to be marked dirty again, and hence written back again, possibly | |
973 | * before the previous writepage completed. | |
974 | * | |
975 | * Block here, instead of in ->writepage(), so that the userspace fs | |
976 | * can only block processes actually operating on the filesystem. | |
977 | * | |
978 | * Otherwise unprivileged userspace fs would be able to block | |
979 | * unrelated: | |
980 | * | |
981 | * - page migration | |
982 | * - sync(2) | |
983 | * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER | |
984 | */ | |
985 | static int fuse_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
986 | { | |
987 | /* | |
988 | * Don't use page->mapping as it may become NULL from a | |
989 | * concurrent truncate. | |
990 | */ | |
991 | struct inode *inode = vma->vm_file->f_mapping->host; | |
992 | ||
993 | fuse_wait_on_page_writeback(inode, page->index); | |
994 | return 0; | |
995 | } | |
996 | ||
997 | static struct vm_operations_struct fuse_file_vm_ops = { | |
998 | .close = fuse_vma_close, | |
999 | .fault = filemap_fault, | |
1000 | .page_mkwrite = fuse_page_mkwrite, | |
1001 | }; | |
1002 | ||
1003 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1004 | { | |
1005 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) { | |
1006 | struct inode *inode = file->f_dentry->d_inode; | |
1007 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1008 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1009 | struct fuse_file *ff = file->private_data; | |
1010 | /* | |
1011 | * file may be written through mmap, so chain it onto the | |
1012 | * inodes's write_file list | |
1013 | */ | |
1014 | spin_lock(&fc->lock); | |
1015 | if (list_empty(&ff->write_entry)) | |
1016 | list_add(&ff->write_entry, &fi->write_files); | |
1017 | spin_unlock(&fc->lock); | |
1018 | } | |
1019 | file_accessed(file); | |
1020 | vma->vm_ops = &fuse_file_vm_ops; | |
b6aeaded MS |
1021 | return 0; |
1022 | } | |
1023 | ||
71421259 MS |
1024 | static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, |
1025 | struct file_lock *fl) | |
1026 | { | |
1027 | switch (ffl->type) { | |
1028 | case F_UNLCK: | |
1029 | break; | |
1030 | ||
1031 | case F_RDLCK: | |
1032 | case F_WRLCK: | |
1033 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
1034 | ffl->end < ffl->start) | |
1035 | return -EIO; | |
1036 | ||
1037 | fl->fl_start = ffl->start; | |
1038 | fl->fl_end = ffl->end; | |
1039 | fl->fl_pid = ffl->pid; | |
1040 | break; | |
1041 | ||
1042 | default: | |
1043 | return -EIO; | |
1044 | } | |
1045 | fl->fl_type = ffl->type; | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | static void fuse_lk_fill(struct fuse_req *req, struct file *file, | |
a9ff4f87 MS |
1050 | const struct file_lock *fl, int opcode, pid_t pid, |
1051 | int flock) | |
71421259 | 1052 | { |
7706a9d6 | 1053 | struct inode *inode = file->f_path.dentry->d_inode; |
9c8ef561 | 1054 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 MS |
1055 | struct fuse_file *ff = file->private_data; |
1056 | struct fuse_lk_in *arg = &req->misc.lk_in; | |
1057 | ||
1058 | arg->fh = ff->fh; | |
9c8ef561 | 1059 | arg->owner = fuse_lock_owner_id(fc, fl->fl_owner); |
71421259 MS |
1060 | arg->lk.start = fl->fl_start; |
1061 | arg->lk.end = fl->fl_end; | |
1062 | arg->lk.type = fl->fl_type; | |
1063 | arg->lk.pid = pid; | |
a9ff4f87 MS |
1064 | if (flock) |
1065 | arg->lk_flags |= FUSE_LK_FLOCK; | |
71421259 MS |
1066 | req->in.h.opcode = opcode; |
1067 | req->in.h.nodeid = get_node_id(inode); | |
1068 | req->in.numargs = 1; | |
1069 | req->in.args[0].size = sizeof(*arg); | |
1070 | req->in.args[0].value = arg; | |
1071 | } | |
1072 | ||
1073 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
1074 | { | |
7706a9d6 | 1075 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1076 | struct fuse_conn *fc = get_fuse_conn(inode); |
1077 | struct fuse_req *req; | |
1078 | struct fuse_lk_out outarg; | |
1079 | int err; | |
1080 | ||
1081 | req = fuse_get_req(fc); | |
1082 | if (IS_ERR(req)) | |
1083 | return PTR_ERR(req); | |
1084 | ||
a9ff4f87 | 1085 | fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0); |
71421259 MS |
1086 | req->out.numargs = 1; |
1087 | req->out.args[0].size = sizeof(outarg); | |
1088 | req->out.args[0].value = &outarg; | |
1089 | request_send(fc, req); | |
1090 | err = req->out.h.error; | |
1091 | fuse_put_request(fc, req); | |
1092 | if (!err) | |
1093 | err = convert_fuse_file_lock(&outarg.lk, fl); | |
1094 | ||
1095 | return err; | |
1096 | } | |
1097 | ||
a9ff4f87 | 1098 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 1099 | { |
7706a9d6 | 1100 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1101 | struct fuse_conn *fc = get_fuse_conn(inode); |
1102 | struct fuse_req *req; | |
1103 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; | |
1104 | pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0; | |
1105 | int err; | |
1106 | ||
1107 | /* Unlock on close is handled by the flush method */ | |
1108 | if (fl->fl_flags & FL_CLOSE) | |
1109 | return 0; | |
1110 | ||
1111 | req = fuse_get_req(fc); | |
1112 | if (IS_ERR(req)) | |
1113 | return PTR_ERR(req); | |
1114 | ||
a9ff4f87 | 1115 | fuse_lk_fill(req, file, fl, opcode, pid, flock); |
71421259 MS |
1116 | request_send(fc, req); |
1117 | err = req->out.h.error; | |
a4d27e75 MS |
1118 | /* locking is restartable */ |
1119 | if (err == -EINTR) | |
1120 | err = -ERESTARTSYS; | |
71421259 MS |
1121 | fuse_put_request(fc, req); |
1122 | return err; | |
1123 | } | |
1124 | ||
1125 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
1126 | { | |
7706a9d6 | 1127 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1128 | struct fuse_conn *fc = get_fuse_conn(inode); |
1129 | int err; | |
1130 | ||
1131 | if (cmd == F_GETLK) { | |
1132 | if (fc->no_lock) { | |
9d6a8c5c | 1133 | posix_test_lock(file, fl); |
71421259 MS |
1134 | err = 0; |
1135 | } else | |
1136 | err = fuse_getlk(file, fl); | |
1137 | } else { | |
1138 | if (fc->no_lock) | |
1139 | err = posix_lock_file_wait(file, fl); | |
1140 | else | |
a9ff4f87 | 1141 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
1142 | } |
1143 | return err; | |
1144 | } | |
1145 | ||
a9ff4f87 MS |
1146 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
1147 | { | |
1148 | struct inode *inode = file->f_path.dentry->d_inode; | |
1149 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1150 | int err; | |
1151 | ||
1152 | if (fc->no_lock) { | |
1153 | err = flock_lock_file_wait(file, fl); | |
1154 | } else { | |
1155 | /* emulate flock with POSIX locks */ | |
1156 | fl->fl_owner = (fl_owner_t) file; | |
1157 | err = fuse_setlk(file, fl, 1); | |
1158 | } | |
1159 | ||
1160 | return err; | |
1161 | } | |
1162 | ||
b2d2272f MS |
1163 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
1164 | { | |
1165 | struct inode *inode = mapping->host; | |
1166 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1167 | struct fuse_req *req; | |
1168 | struct fuse_bmap_in inarg; | |
1169 | struct fuse_bmap_out outarg; | |
1170 | int err; | |
1171 | ||
1172 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
1173 | return 0; | |
1174 | ||
1175 | req = fuse_get_req(fc); | |
1176 | if (IS_ERR(req)) | |
1177 | return 0; | |
1178 | ||
1179 | memset(&inarg, 0, sizeof(inarg)); | |
1180 | inarg.block = block; | |
1181 | inarg.blocksize = inode->i_sb->s_blocksize; | |
1182 | req->in.h.opcode = FUSE_BMAP; | |
1183 | req->in.h.nodeid = get_node_id(inode); | |
1184 | req->in.numargs = 1; | |
1185 | req->in.args[0].size = sizeof(inarg); | |
1186 | req->in.args[0].value = &inarg; | |
1187 | req->out.numargs = 1; | |
1188 | req->out.args[0].size = sizeof(outarg); | |
1189 | req->out.args[0].value = &outarg; | |
1190 | request_send(fc, req); | |
1191 | err = req->out.h.error; | |
1192 | fuse_put_request(fc, req); | |
1193 | if (err == -ENOSYS) | |
1194 | fc->no_bmap = 1; | |
1195 | ||
1196 | return err ? 0 : outarg.block; | |
1197 | } | |
1198 | ||
4b6f5d20 | 1199 | static const struct file_operations fuse_file_operations = { |
b6aeaded | 1200 | .llseek = generic_file_llseek, |
543ade1f | 1201 | .read = do_sync_read, |
bcb4be80 | 1202 | .aio_read = fuse_file_aio_read, |
543ade1f BP |
1203 | .write = do_sync_write, |
1204 | .aio_write = generic_file_aio_write, | |
b6aeaded MS |
1205 | .mmap = fuse_file_mmap, |
1206 | .open = fuse_open, | |
1207 | .flush = fuse_flush, | |
1208 | .release = fuse_release, | |
1209 | .fsync = fuse_fsync, | |
71421259 | 1210 | .lock = fuse_file_lock, |
a9ff4f87 | 1211 | .flock = fuse_file_flock, |
5ffc4ef4 | 1212 | .splice_read = generic_file_splice_read, |
b6aeaded MS |
1213 | }; |
1214 | ||
4b6f5d20 | 1215 | static const struct file_operations fuse_direct_io_file_operations = { |
413ef8cb MS |
1216 | .llseek = generic_file_llseek, |
1217 | .read = fuse_direct_read, | |
1218 | .write = fuse_direct_write, | |
1219 | .open = fuse_open, | |
1220 | .flush = fuse_flush, | |
1221 | .release = fuse_release, | |
1222 | .fsync = fuse_fsync, | |
71421259 | 1223 | .lock = fuse_file_lock, |
a9ff4f87 | 1224 | .flock = fuse_file_flock, |
5ffc4ef4 | 1225 | /* no mmap and splice_read */ |
413ef8cb MS |
1226 | }; |
1227 | ||
f5e54d6e | 1228 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 1229 | .readpage = fuse_readpage, |
3be5a52b MS |
1230 | .writepage = fuse_writepage, |
1231 | .launder_page = fuse_launder_page, | |
5e6f58a1 NP |
1232 | .write_begin = fuse_write_begin, |
1233 | .write_end = fuse_write_end, | |
db50b96c | 1234 | .readpages = fuse_readpages, |
3be5a52b | 1235 | .set_page_dirty = __set_page_dirty_nobuffers, |
b2d2272f | 1236 | .bmap = fuse_bmap, |
b6aeaded MS |
1237 | }; |
1238 | ||
1239 | void fuse_init_file_inode(struct inode *inode) | |
1240 | { | |
45323fb7 MS |
1241 | inode->i_fop = &fuse_file_operations; |
1242 | inode->i_data.a_ops = &fuse_file_aops; | |
b6aeaded | 1243 | } |