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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> | |
14 | ||
4b6f5d20 | 15 | static const struct file_operations fuse_direct_io_file_operations; |
45323fb7 | 16 | |
fd72faac MS |
17 | static int fuse_send_open(struct inode *inode, struct file *file, int isdir, |
18 | struct fuse_open_out *outargp) | |
b6aeaded MS |
19 | { |
20 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b6aeaded | 21 | struct fuse_open_in inarg; |
fd72faac MS |
22 | struct fuse_req *req; |
23 | int err; | |
24 | ||
ce1d5a49 MS |
25 | req = fuse_get_req(fc); |
26 | if (IS_ERR(req)) | |
27 | return PTR_ERR(req); | |
fd72faac MS |
28 | |
29 | memset(&inarg, 0, sizeof(inarg)); | |
30 | inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); | |
31 | req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; | |
32 | req->in.h.nodeid = get_node_id(inode); | |
fd72faac MS |
33 | req->in.numargs = 1; |
34 | req->in.args[0].size = sizeof(inarg); | |
35 | req->in.args[0].value = &inarg; | |
36 | req->out.numargs = 1; | |
37 | req->out.args[0].size = sizeof(*outargp); | |
38 | req->out.args[0].value = outargp; | |
39 | request_send(fc, req); | |
40 | err = req->out.h.error; | |
41 | fuse_put_request(fc, req); | |
42 | ||
43 | return err; | |
44 | } | |
45 | ||
46 | struct fuse_file *fuse_file_alloc(void) | |
47 | { | |
48 | struct fuse_file *ff; | |
49 | ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); | |
50 | if (ff) { | |
33649c91 MS |
51 | ff->reserved_req = fuse_request_alloc(); |
52 | if (!ff->reserved_req) { | |
fd72faac MS |
53 | kfree(ff); |
54 | ff = NULL; | |
55 | } | |
56 | } | |
57 | return ff; | |
58 | } | |
59 | ||
60 | void fuse_file_free(struct fuse_file *ff) | |
61 | { | |
33649c91 | 62 | fuse_request_free(ff->reserved_req); |
fd72faac MS |
63 | kfree(ff); |
64 | } | |
65 | ||
66 | void fuse_finish_open(struct inode *inode, struct file *file, | |
67 | struct fuse_file *ff, struct fuse_open_out *outarg) | |
68 | { | |
69 | if (outarg->open_flags & FOPEN_DIRECT_IO) | |
70 | file->f_op = &fuse_direct_io_file_operations; | |
71 | if (!(outarg->open_flags & FOPEN_KEEP_CACHE)) | |
72 | invalidate_inode_pages(inode->i_mapping); | |
73 | ff->fh = outarg->fh; | |
74 | file->private_data = ff; | |
75 | } | |
76 | ||
77 | int fuse_open_common(struct inode *inode, struct file *file, int isdir) | |
78 | { | |
b6aeaded MS |
79 | struct fuse_open_out outarg; |
80 | struct fuse_file *ff; | |
81 | int err; | |
b6aeaded | 82 | |
dd190d06 MS |
83 | /* VFS checks this, but only _after_ ->open() */ |
84 | if (file->f_flags & O_DIRECT) | |
85 | return -EINVAL; | |
86 | ||
b6aeaded MS |
87 | err = generic_file_open(inode, file); |
88 | if (err) | |
89 | return err; | |
90 | ||
91 | /* If opening the root node, no lookup has been performed on | |
92 | it, so the attributes must be refreshed */ | |
93 | if (get_node_id(inode) == FUSE_ROOT_ID) { | |
fd72faac | 94 | err = fuse_do_getattr(inode); |
b6aeaded MS |
95 | if (err) |
96 | return err; | |
97 | } | |
98 | ||
fd72faac | 99 | ff = fuse_file_alloc(); |
b6aeaded | 100 | if (!ff) |
fd72faac | 101 | return -ENOMEM; |
b6aeaded | 102 | |
fd72faac MS |
103 | err = fuse_send_open(inode, file, isdir, &outarg); |
104 | if (err) | |
105 | fuse_file_free(ff); | |
106 | else { | |
107 | if (isdir) | |
108 | outarg.open_flags &= ~FOPEN_DIRECT_IO; | |
109 | fuse_finish_open(inode, file, ff, &outarg); | |
b6aeaded MS |
110 | } |
111 | ||
b6aeaded MS |
112 | return err; |
113 | } | |
114 | ||
51eb01e7 MS |
115 | struct fuse_req *fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, |
116 | int opcode) | |
64c6d8ed | 117 | { |
33649c91 | 118 | struct fuse_req *req = ff->reserved_req; |
b6aeaded MS |
119 | struct fuse_release_in *inarg = &req->misc.release_in; |
120 | ||
121 | inarg->fh = ff->fh; | |
fd72faac | 122 | inarg->flags = flags; |
51eb01e7 | 123 | req->in.h.opcode = opcode; |
fd72faac | 124 | req->in.h.nodeid = nodeid; |
b6aeaded MS |
125 | req->in.numargs = 1; |
126 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
127 | req->in.args[0].value = inarg; | |
b6aeaded | 128 | kfree(ff); |
51eb01e7 MS |
129 | |
130 | return req; | |
fd72faac MS |
131 | } |
132 | ||
133 | int fuse_release_common(struct inode *inode, struct file *file, int isdir) | |
134 | { | |
135 | struct fuse_file *ff = file->private_data; | |
136 | if (ff) { | |
137 | struct fuse_conn *fc = get_fuse_conn(inode); | |
51eb01e7 MS |
138 | struct fuse_req *req; |
139 | ||
140 | req = fuse_release_fill(ff, get_node_id(inode), file->f_flags, | |
141 | isdir ? FUSE_RELEASEDIR : FUSE_RELEASE); | |
142 | ||
143 | /* Hold vfsmount and dentry until release is finished */ | |
144 | req->vfsmount = mntget(file->f_vfsmnt); | |
145 | req->dentry = dget(file->f_dentry); | |
146 | request_send_background(fc, req); | |
fd72faac | 147 | } |
b6aeaded MS |
148 | |
149 | /* Return value is ignored by VFS */ | |
150 | return 0; | |
151 | } | |
152 | ||
04730fef MS |
153 | static int fuse_open(struct inode *inode, struct file *file) |
154 | { | |
155 | return fuse_open_common(inode, file, 0); | |
156 | } | |
157 | ||
158 | static int fuse_release(struct inode *inode, struct file *file) | |
159 | { | |
160 | return fuse_release_common(inode, file, 0); | |
161 | } | |
162 | ||
71421259 | 163 | /* |
9c8ef561 MS |
164 | * Scramble the ID space with XTEA, so that the value of the files_struct |
165 | * pointer is not exposed to userspace. | |
71421259 | 166 | */ |
9c8ef561 | 167 | static u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 168 | { |
9c8ef561 MS |
169 | u32 *k = fc->scramble_key; |
170 | u64 v = (unsigned long) id; | |
171 | u32 v0 = v; | |
172 | u32 v1 = v >> 32; | |
173 | u32 sum = 0; | |
174 | int i; | |
175 | ||
176 | for (i = 0; i < 32; i++) { | |
177 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
178 | sum += 0x9E3779B9; | |
179 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
180 | } | |
181 | ||
182 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
183 | } |
184 | ||
75e1fcc0 | 185 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded MS |
186 | { |
187 | struct inode *inode = file->f_dentry->d_inode; | |
188 | struct fuse_conn *fc = get_fuse_conn(inode); | |
189 | struct fuse_file *ff = file->private_data; | |
190 | struct fuse_req *req; | |
191 | struct fuse_flush_in inarg; | |
192 | int err; | |
193 | ||
248d86e8 MS |
194 | if (is_bad_inode(inode)) |
195 | return -EIO; | |
196 | ||
b6aeaded MS |
197 | if (fc->no_flush) |
198 | return 0; | |
199 | ||
33649c91 | 200 | req = fuse_get_req_nofail(fc, file); |
b6aeaded MS |
201 | memset(&inarg, 0, sizeof(inarg)); |
202 | inarg.fh = ff->fh; | |
9c8ef561 | 203 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
204 | req->in.h.opcode = FUSE_FLUSH; |
205 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
206 | req->in.numargs = 1; |
207 | req->in.args[0].size = sizeof(inarg); | |
208 | req->in.args[0].value = &inarg; | |
71421259 | 209 | req->force = 1; |
7c352bdf | 210 | request_send(fc, req); |
b6aeaded MS |
211 | err = req->out.h.error; |
212 | fuse_put_request(fc, req); | |
213 | if (err == -ENOSYS) { | |
214 | fc->no_flush = 1; | |
215 | err = 0; | |
216 | } | |
217 | return err; | |
218 | } | |
219 | ||
82547981 MS |
220 | int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, |
221 | int isdir) | |
b6aeaded MS |
222 | { |
223 | struct inode *inode = de->d_inode; | |
224 | struct fuse_conn *fc = get_fuse_conn(inode); | |
225 | struct fuse_file *ff = file->private_data; | |
226 | struct fuse_req *req; | |
227 | struct fuse_fsync_in inarg; | |
228 | int err; | |
229 | ||
248d86e8 MS |
230 | if (is_bad_inode(inode)) |
231 | return -EIO; | |
232 | ||
82547981 | 233 | if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) |
b6aeaded MS |
234 | return 0; |
235 | ||
ce1d5a49 MS |
236 | req = fuse_get_req(fc); |
237 | if (IS_ERR(req)) | |
238 | return PTR_ERR(req); | |
b6aeaded MS |
239 | |
240 | memset(&inarg, 0, sizeof(inarg)); | |
241 | inarg.fh = ff->fh; | |
242 | inarg.fsync_flags = datasync ? 1 : 0; | |
82547981 | 243 | req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC; |
b6aeaded | 244 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
245 | req->in.numargs = 1; |
246 | req->in.args[0].size = sizeof(inarg); | |
247 | req->in.args[0].value = &inarg; | |
248 | request_send(fc, req); | |
249 | err = req->out.h.error; | |
250 | fuse_put_request(fc, req); | |
251 | if (err == -ENOSYS) { | |
82547981 MS |
252 | if (isdir) |
253 | fc->no_fsyncdir = 1; | |
254 | else | |
255 | fc->no_fsync = 1; | |
b6aeaded MS |
256 | err = 0; |
257 | } | |
258 | return err; | |
259 | } | |
260 | ||
82547981 MS |
261 | static int fuse_fsync(struct file *file, struct dentry *de, int datasync) |
262 | { | |
263 | return fuse_fsync_common(file, de, datasync, 0); | |
264 | } | |
265 | ||
361b1eb5 MS |
266 | void fuse_read_fill(struct fuse_req *req, struct file *file, |
267 | struct inode *inode, loff_t pos, size_t count, int opcode) | |
b6aeaded | 268 | { |
b6aeaded | 269 | struct fuse_file *ff = file->private_data; |
361b1eb5 | 270 | struct fuse_read_in *inarg = &req->misc.read_in; |
b6aeaded | 271 | |
361b1eb5 MS |
272 | inarg->fh = ff->fh; |
273 | inarg->offset = pos; | |
274 | inarg->size = count; | |
275 | req->in.h.opcode = opcode; | |
b6aeaded | 276 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
277 | req->in.numargs = 1; |
278 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 279 | req->in.args[0].value = inarg; |
b6aeaded MS |
280 | req->out.argpages = 1; |
281 | req->out.argvar = 1; | |
282 | req->out.numargs = 1; | |
283 | req->out.args[0].size = count; | |
b6aeaded MS |
284 | } |
285 | ||
8bfc016d MS |
286 | static size_t fuse_send_read(struct fuse_req *req, struct file *file, |
287 | struct inode *inode, loff_t pos, size_t count) | |
04730fef | 288 | { |
361b1eb5 MS |
289 | struct fuse_conn *fc = get_fuse_conn(inode); |
290 | fuse_read_fill(req, file, inode, pos, count, FUSE_READ); | |
291 | request_send(fc, req); | |
292 | return req->out.args[0].size; | |
04730fef MS |
293 | } |
294 | ||
b6aeaded MS |
295 | static int fuse_readpage(struct file *file, struct page *page) |
296 | { | |
297 | struct inode *inode = page->mapping->host; | |
298 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 MS |
299 | struct fuse_req *req; |
300 | int err; | |
301 | ||
302 | err = -EIO; | |
303 | if (is_bad_inode(inode)) | |
304 | goto out; | |
305 | ||
ce1d5a49 MS |
306 | req = fuse_get_req(fc); |
307 | err = PTR_ERR(req); | |
308 | if (IS_ERR(req)) | |
b6aeaded MS |
309 | goto out; |
310 | ||
311 | req->out.page_zeroing = 1; | |
312 | req->num_pages = 1; | |
313 | req->pages[0] = page; | |
4633a22e | 314 | fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE); |
b6aeaded MS |
315 | err = req->out.h.error; |
316 | fuse_put_request(fc, req); | |
317 | if (!err) | |
318 | SetPageUptodate(page); | |
b36c31ba | 319 | fuse_invalidate_attr(inode); /* atime changed */ |
b6aeaded MS |
320 | out: |
321 | unlock_page(page); | |
322 | return err; | |
323 | } | |
324 | ||
c1aa96a5 | 325 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 326 | { |
c1aa96a5 MS |
327 | int i; |
328 | ||
329 | fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */ | |
330 | ||
db50b96c MS |
331 | for (i = 0; i < req->num_pages; i++) { |
332 | struct page *page = req->pages[i]; | |
333 | if (!req->out.h.error) | |
334 | SetPageUptodate(page); | |
c1aa96a5 MS |
335 | else |
336 | SetPageError(page); | |
db50b96c MS |
337 | unlock_page(page); |
338 | } | |
c1aa96a5 MS |
339 | fuse_put_request(fc, req); |
340 | } | |
341 | ||
342 | static void fuse_send_readpages(struct fuse_req *req, struct file *file, | |
343 | struct inode *inode) | |
344 | { | |
345 | struct fuse_conn *fc = get_fuse_conn(inode); | |
346 | loff_t pos = page_offset(req->pages[0]); | |
347 | size_t count = req->num_pages << PAGE_CACHE_SHIFT; | |
348 | req->out.page_zeroing = 1; | |
c1aa96a5 | 349 | fuse_read_fill(req, file, inode, pos, count, FUSE_READ); |
9cd68455 | 350 | if (fc->async_read) { |
51eb01e7 MS |
351 | get_file(file); |
352 | req->file = file; | |
9cd68455 MS |
353 | req->end = fuse_readpages_end; |
354 | request_send_background(fc, req); | |
355 | } else { | |
356 | request_send(fc, req); | |
357 | fuse_readpages_end(fc, req); | |
358 | } | |
db50b96c MS |
359 | } |
360 | ||
361 | struct fuse_readpages_data { | |
362 | struct fuse_req *req; | |
363 | struct file *file; | |
364 | struct inode *inode; | |
365 | }; | |
366 | ||
367 | static int fuse_readpages_fill(void *_data, struct page *page) | |
368 | { | |
369 | struct fuse_readpages_data *data = _data; | |
370 | struct fuse_req *req = data->req; | |
371 | struct inode *inode = data->inode; | |
372 | struct fuse_conn *fc = get_fuse_conn(inode); | |
373 | ||
374 | if (req->num_pages && | |
375 | (req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
376 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || | |
377 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { | |
c1aa96a5 | 378 | fuse_send_readpages(req, data->file, inode); |
ce1d5a49 MS |
379 | data->req = req = fuse_get_req(fc); |
380 | if (IS_ERR(req)) { | |
db50b96c | 381 | unlock_page(page); |
ce1d5a49 | 382 | return PTR_ERR(req); |
db50b96c | 383 | } |
db50b96c MS |
384 | } |
385 | req->pages[req->num_pages] = page; | |
386 | req->num_pages ++; | |
387 | return 0; | |
388 | } | |
389 | ||
390 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
391 | struct list_head *pages, unsigned nr_pages) | |
392 | { | |
393 | struct inode *inode = mapping->host; | |
394 | struct fuse_conn *fc = get_fuse_conn(inode); | |
395 | struct fuse_readpages_data data; | |
396 | int err; | |
248d86e8 | 397 | |
1d7ea732 | 398 | err = -EIO; |
248d86e8 | 399 | if (is_bad_inode(inode)) |
1d7ea732 | 400 | goto clean_pages_up; |
248d86e8 | 401 | |
db50b96c MS |
402 | data.file = file; |
403 | data.inode = inode; | |
ce1d5a49 | 404 | data.req = fuse_get_req(fc); |
1d7ea732 | 405 | err = PTR_ERR(data.req); |
ce1d5a49 | 406 | if (IS_ERR(data.req)) |
1d7ea732 | 407 | goto clean_pages_up; |
db50b96c MS |
408 | |
409 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
410 | if (!err) { |
411 | if (data.req->num_pages) | |
412 | fuse_send_readpages(data.req, file, inode); | |
413 | else | |
414 | fuse_put_request(fc, data.req); | |
415 | } | |
db50b96c | 416 | return err; |
1d7ea732 AZ |
417 | |
418 | clean_pages_up: | |
419 | put_pages_list(pages); | |
420 | return err; | |
db50b96c MS |
421 | } |
422 | ||
04730fef MS |
423 | static size_t fuse_send_write(struct fuse_req *req, struct file *file, |
424 | struct inode *inode, loff_t pos, size_t count) | |
b6aeaded MS |
425 | { |
426 | struct fuse_conn *fc = get_fuse_conn(inode); | |
427 | struct fuse_file *ff = file->private_data; | |
428 | struct fuse_write_in inarg; | |
429 | struct fuse_write_out outarg; | |
430 | ||
431 | memset(&inarg, 0, sizeof(struct fuse_write_in)); | |
432 | inarg.fh = ff->fh; | |
433 | inarg.offset = pos; | |
434 | inarg.size = count; | |
435 | req->in.h.opcode = FUSE_WRITE; | |
436 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
437 | req->in.argpages = 1; |
438 | req->in.numargs = 2; | |
439 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
440 | req->in.args[0].value = &inarg; | |
441 | req->in.args[1].size = count; | |
442 | req->out.numargs = 1; | |
443 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
444 | req->out.args[0].value = &outarg; | |
7c352bdf | 445 | request_send(fc, req); |
b6aeaded MS |
446 | return outarg.size; |
447 | } | |
448 | ||
449 | static int fuse_prepare_write(struct file *file, struct page *page, | |
450 | unsigned offset, unsigned to) | |
451 | { | |
452 | /* No op */ | |
453 | return 0; | |
454 | } | |
455 | ||
456 | static int fuse_commit_write(struct file *file, struct page *page, | |
457 | unsigned offset, unsigned to) | |
458 | { | |
459 | int err; | |
04730fef | 460 | size_t nres; |
b6aeaded MS |
461 | unsigned count = to - offset; |
462 | struct inode *inode = page->mapping->host; | |
463 | struct fuse_conn *fc = get_fuse_conn(inode); | |
4633a22e | 464 | loff_t pos = page_offset(page) + offset; |
248d86e8 MS |
465 | struct fuse_req *req; |
466 | ||
467 | if (is_bad_inode(inode)) | |
468 | return -EIO; | |
469 | ||
ce1d5a49 MS |
470 | req = fuse_get_req(fc); |
471 | if (IS_ERR(req)) | |
472 | return PTR_ERR(req); | |
b6aeaded MS |
473 | |
474 | req->num_pages = 1; | |
475 | req->pages[0] = page; | |
476 | req->page_offset = offset; | |
477 | nres = fuse_send_write(req, file, inode, pos, count); | |
478 | err = req->out.h.error; | |
479 | fuse_put_request(fc, req); | |
480 | if (!err && nres != count) | |
481 | err = -EIO; | |
482 | if (!err) { | |
483 | pos += count; | |
9ffbb916 MS |
484 | spin_lock(&fc->lock); |
485 | if (pos > inode->i_size) | |
b6aeaded | 486 | i_size_write(inode, pos); |
9ffbb916 | 487 | spin_unlock(&fc->lock); |
b6aeaded MS |
488 | |
489 | if (offset == 0 && to == PAGE_CACHE_SIZE) { | |
490 | clear_page_dirty(page); | |
491 | SetPageUptodate(page); | |
492 | } | |
b36c31ba MS |
493 | } |
494 | fuse_invalidate_attr(inode); | |
b6aeaded MS |
495 | return err; |
496 | } | |
497 | ||
413ef8cb MS |
498 | static void fuse_release_user_pages(struct fuse_req *req, int write) |
499 | { | |
500 | unsigned i; | |
501 | ||
502 | for (i = 0; i < req->num_pages; i++) { | |
503 | struct page *page = req->pages[i]; | |
504 | if (write) | |
505 | set_page_dirty_lock(page); | |
506 | put_page(page); | |
507 | } | |
508 | } | |
509 | ||
510 | static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, | |
511 | unsigned nbytes, int write) | |
512 | { | |
513 | unsigned long user_addr = (unsigned long) buf; | |
514 | unsigned offset = user_addr & ~PAGE_MASK; | |
515 | int npages; | |
516 | ||
517 | /* This doesn't work with nfsd */ | |
518 | if (!current->mm) | |
519 | return -EPERM; | |
520 | ||
521 | nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); | |
522 | npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
6ad84aca | 523 | npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ); |
413ef8cb MS |
524 | down_read(¤t->mm->mmap_sem); |
525 | npages = get_user_pages(current, current->mm, user_addr, npages, write, | |
526 | 0, req->pages, NULL); | |
527 | up_read(¤t->mm->mmap_sem); | |
528 | if (npages < 0) | |
529 | return npages; | |
530 | ||
531 | req->num_pages = npages; | |
532 | req->page_offset = offset; | |
533 | return 0; | |
534 | } | |
535 | ||
536 | static ssize_t fuse_direct_io(struct file *file, const char __user *buf, | |
537 | size_t count, loff_t *ppos, int write) | |
538 | { | |
539 | struct inode *inode = file->f_dentry->d_inode; | |
540 | struct fuse_conn *fc = get_fuse_conn(inode); | |
541 | size_t nmax = write ? fc->max_write : fc->max_read; | |
542 | loff_t pos = *ppos; | |
543 | ssize_t res = 0; | |
248d86e8 MS |
544 | struct fuse_req *req; |
545 | ||
546 | if (is_bad_inode(inode)) | |
547 | return -EIO; | |
548 | ||
ce1d5a49 MS |
549 | req = fuse_get_req(fc); |
550 | if (IS_ERR(req)) | |
551 | return PTR_ERR(req); | |
413ef8cb MS |
552 | |
553 | while (count) { | |
413ef8cb MS |
554 | size_t nres; |
555 | size_t nbytes = min(count, nmax); | |
556 | int err = fuse_get_user_pages(req, buf, nbytes, !write); | |
557 | if (err) { | |
558 | res = err; | |
559 | break; | |
560 | } | |
6ad84aca MS |
561 | nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset; |
562 | nbytes = min(count, nbytes); | |
413ef8cb MS |
563 | if (write) |
564 | nres = fuse_send_write(req, file, inode, pos, nbytes); | |
565 | else | |
566 | nres = fuse_send_read(req, file, inode, pos, nbytes); | |
567 | fuse_release_user_pages(req, !write); | |
568 | if (req->out.h.error) { | |
569 | if (!res) | |
570 | res = req->out.h.error; | |
571 | break; | |
572 | } else if (nres > nbytes) { | |
573 | res = -EIO; | |
574 | break; | |
575 | } | |
576 | count -= nres; | |
577 | res += nres; | |
578 | pos += nres; | |
579 | buf += nres; | |
580 | if (nres != nbytes) | |
581 | break; | |
56cf34ff MS |
582 | if (count) { |
583 | fuse_put_request(fc, req); | |
584 | req = fuse_get_req(fc); | |
585 | if (IS_ERR(req)) | |
586 | break; | |
587 | } | |
413ef8cb MS |
588 | } |
589 | fuse_put_request(fc, req); | |
590 | if (res > 0) { | |
9ffbb916 MS |
591 | if (write) { |
592 | spin_lock(&fc->lock); | |
593 | if (pos > inode->i_size) | |
594 | i_size_write(inode, pos); | |
595 | spin_unlock(&fc->lock); | |
596 | } | |
413ef8cb | 597 | *ppos = pos; |
b36c31ba MS |
598 | } |
599 | fuse_invalidate_attr(inode); | |
413ef8cb MS |
600 | |
601 | return res; | |
602 | } | |
603 | ||
604 | static ssize_t fuse_direct_read(struct file *file, char __user *buf, | |
605 | size_t count, loff_t *ppos) | |
606 | { | |
607 | return fuse_direct_io(file, buf, count, ppos, 0); | |
608 | } | |
609 | ||
610 | static ssize_t fuse_direct_write(struct file *file, const char __user *buf, | |
611 | size_t count, loff_t *ppos) | |
612 | { | |
613 | struct inode *inode = file->f_dentry->d_inode; | |
614 | ssize_t res; | |
615 | /* Don't allow parallel writes to the same file */ | |
1b1dcc1b | 616 | mutex_lock(&inode->i_mutex); |
413ef8cb | 617 | res = fuse_direct_io(file, buf, count, ppos, 1); |
1b1dcc1b | 618 | mutex_unlock(&inode->i_mutex); |
413ef8cb MS |
619 | return res; |
620 | } | |
621 | ||
b6aeaded MS |
622 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) |
623 | { | |
624 | if ((vma->vm_flags & VM_SHARED)) { | |
625 | if ((vma->vm_flags & VM_WRITE)) | |
626 | return -ENODEV; | |
627 | else | |
628 | vma->vm_flags &= ~VM_MAYWRITE; | |
629 | } | |
630 | return generic_file_mmap(file, vma); | |
631 | } | |
632 | ||
633 | static int fuse_set_page_dirty(struct page *page) | |
634 | { | |
635 | printk("fuse_set_page_dirty: should not happen\n"); | |
636 | dump_stack(); | |
637 | return 0; | |
638 | } | |
639 | ||
71421259 MS |
640 | static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, |
641 | struct file_lock *fl) | |
642 | { | |
643 | switch (ffl->type) { | |
644 | case F_UNLCK: | |
645 | break; | |
646 | ||
647 | case F_RDLCK: | |
648 | case F_WRLCK: | |
649 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
650 | ffl->end < ffl->start) | |
651 | return -EIO; | |
652 | ||
653 | fl->fl_start = ffl->start; | |
654 | fl->fl_end = ffl->end; | |
655 | fl->fl_pid = ffl->pid; | |
656 | break; | |
657 | ||
658 | default: | |
659 | return -EIO; | |
660 | } | |
661 | fl->fl_type = ffl->type; | |
662 | return 0; | |
663 | } | |
664 | ||
665 | static void fuse_lk_fill(struct fuse_req *req, struct file *file, | |
666 | const struct file_lock *fl, int opcode, pid_t pid) | |
667 | { | |
668 | struct inode *inode = file->f_dentry->d_inode; | |
9c8ef561 | 669 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 MS |
670 | struct fuse_file *ff = file->private_data; |
671 | struct fuse_lk_in *arg = &req->misc.lk_in; | |
672 | ||
673 | arg->fh = ff->fh; | |
9c8ef561 | 674 | arg->owner = fuse_lock_owner_id(fc, fl->fl_owner); |
71421259 MS |
675 | arg->lk.start = fl->fl_start; |
676 | arg->lk.end = fl->fl_end; | |
677 | arg->lk.type = fl->fl_type; | |
678 | arg->lk.pid = pid; | |
679 | req->in.h.opcode = opcode; | |
680 | req->in.h.nodeid = get_node_id(inode); | |
681 | req->in.numargs = 1; | |
682 | req->in.args[0].size = sizeof(*arg); | |
683 | req->in.args[0].value = arg; | |
684 | } | |
685 | ||
686 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
687 | { | |
688 | struct inode *inode = file->f_dentry->d_inode; | |
689 | struct fuse_conn *fc = get_fuse_conn(inode); | |
690 | struct fuse_req *req; | |
691 | struct fuse_lk_out outarg; | |
692 | int err; | |
693 | ||
694 | req = fuse_get_req(fc); | |
695 | if (IS_ERR(req)) | |
696 | return PTR_ERR(req); | |
697 | ||
698 | fuse_lk_fill(req, file, fl, FUSE_GETLK, 0); | |
699 | req->out.numargs = 1; | |
700 | req->out.args[0].size = sizeof(outarg); | |
701 | req->out.args[0].value = &outarg; | |
702 | request_send(fc, req); | |
703 | err = req->out.h.error; | |
704 | fuse_put_request(fc, req); | |
705 | if (!err) | |
706 | err = convert_fuse_file_lock(&outarg.lk, fl); | |
707 | ||
708 | return err; | |
709 | } | |
710 | ||
711 | static int fuse_setlk(struct file *file, struct file_lock *fl) | |
712 | { | |
713 | struct inode *inode = file->f_dentry->d_inode; | |
714 | struct fuse_conn *fc = get_fuse_conn(inode); | |
715 | struct fuse_req *req; | |
716 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; | |
717 | pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0; | |
718 | int err; | |
719 | ||
720 | /* Unlock on close is handled by the flush method */ | |
721 | if (fl->fl_flags & FL_CLOSE) | |
722 | return 0; | |
723 | ||
724 | req = fuse_get_req(fc); | |
725 | if (IS_ERR(req)) | |
726 | return PTR_ERR(req); | |
727 | ||
728 | fuse_lk_fill(req, file, fl, opcode, pid); | |
729 | request_send(fc, req); | |
730 | err = req->out.h.error; | |
a4d27e75 MS |
731 | /* locking is restartable */ |
732 | if (err == -EINTR) | |
733 | err = -ERESTARTSYS; | |
71421259 MS |
734 | fuse_put_request(fc, req); |
735 | return err; | |
736 | } | |
737 | ||
738 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
739 | { | |
740 | struct inode *inode = file->f_dentry->d_inode; | |
741 | struct fuse_conn *fc = get_fuse_conn(inode); | |
742 | int err; | |
743 | ||
744 | if (cmd == F_GETLK) { | |
745 | if (fc->no_lock) { | |
746 | if (!posix_test_lock(file, fl, fl)) | |
747 | fl->fl_type = F_UNLCK; | |
748 | err = 0; | |
749 | } else | |
750 | err = fuse_getlk(file, fl); | |
751 | } else { | |
752 | if (fc->no_lock) | |
753 | err = posix_lock_file_wait(file, fl); | |
754 | else | |
755 | err = fuse_setlk(file, fl); | |
756 | } | |
757 | return err; | |
758 | } | |
759 | ||
4b6f5d20 | 760 | static const struct file_operations fuse_file_operations = { |
b6aeaded | 761 | .llseek = generic_file_llseek, |
543ade1f BP |
762 | .read = do_sync_read, |
763 | .aio_read = generic_file_aio_read, | |
764 | .write = do_sync_write, | |
765 | .aio_write = generic_file_aio_write, | |
b6aeaded MS |
766 | .mmap = fuse_file_mmap, |
767 | .open = fuse_open, | |
768 | .flush = fuse_flush, | |
769 | .release = fuse_release, | |
770 | .fsync = fuse_fsync, | |
71421259 | 771 | .lock = fuse_file_lock, |
b6aeaded MS |
772 | .sendfile = generic_file_sendfile, |
773 | }; | |
774 | ||
4b6f5d20 | 775 | static const struct file_operations fuse_direct_io_file_operations = { |
413ef8cb MS |
776 | .llseek = generic_file_llseek, |
777 | .read = fuse_direct_read, | |
778 | .write = fuse_direct_write, | |
779 | .open = fuse_open, | |
780 | .flush = fuse_flush, | |
781 | .release = fuse_release, | |
782 | .fsync = fuse_fsync, | |
71421259 | 783 | .lock = fuse_file_lock, |
413ef8cb MS |
784 | /* no mmap and sendfile */ |
785 | }; | |
786 | ||
f5e54d6e | 787 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded MS |
788 | .readpage = fuse_readpage, |
789 | .prepare_write = fuse_prepare_write, | |
790 | .commit_write = fuse_commit_write, | |
db50b96c | 791 | .readpages = fuse_readpages, |
b6aeaded MS |
792 | .set_page_dirty = fuse_set_page_dirty, |
793 | }; | |
794 | ||
795 | void fuse_init_file_inode(struct inode *inode) | |
796 | { | |
45323fb7 MS |
797 | inode->i_fop = &fuse_file_operations; |
798 | inode->i_data.a_ops = &fuse_file_aops; | |
b6aeaded | 799 | } |