Commit | Line | Data |
---|---|---|
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 | { | |
80 | dput(req->dentry); | |
81 | mntput(req->vfsmount); | |
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; | |
89 | struct fuse_conn *fc = get_fuse_conn(req->dentry->d_inode); | |
819c4b3b | 90 | req->end = fuse_release_end; |
c756e0a4 MS |
91 | request_send_background(fc, req); |
92 | kfree(ff); | |
93 | } | |
94 | } | |
95 | ||
fd72faac MS |
96 | void fuse_finish_open(struct inode *inode, struct file *file, |
97 | struct fuse_file *ff, struct fuse_open_out *outarg) | |
98 | { | |
99 | if (outarg->open_flags & FOPEN_DIRECT_IO) | |
100 | file->f_op = &fuse_direct_io_file_operations; | |
101 | if (!(outarg->open_flags & FOPEN_KEEP_CACHE)) | |
b1009979 | 102 | invalidate_inode_pages2(inode->i_mapping); |
fd72faac | 103 | ff->fh = outarg->fh; |
c756e0a4 | 104 | file->private_data = fuse_file_get(ff); |
fd72faac MS |
105 | } |
106 | ||
107 | int fuse_open_common(struct inode *inode, struct file *file, int isdir) | |
108 | { | |
b6aeaded MS |
109 | struct fuse_open_out outarg; |
110 | struct fuse_file *ff; | |
111 | int err; | |
b6aeaded | 112 | |
dd190d06 MS |
113 | /* VFS checks this, but only _after_ ->open() */ |
114 | if (file->f_flags & O_DIRECT) | |
115 | return -EINVAL; | |
116 | ||
b6aeaded MS |
117 | err = generic_file_open(inode, file); |
118 | if (err) | |
119 | return err; | |
120 | ||
fd72faac | 121 | ff = fuse_file_alloc(); |
b6aeaded | 122 | if (!ff) |
fd72faac | 123 | return -ENOMEM; |
b6aeaded | 124 | |
fd72faac MS |
125 | err = fuse_send_open(inode, file, isdir, &outarg); |
126 | if (err) | |
127 | fuse_file_free(ff); | |
128 | else { | |
129 | if (isdir) | |
130 | outarg.open_flags &= ~FOPEN_DIRECT_IO; | |
131 | fuse_finish_open(inode, file, ff, &outarg); | |
b6aeaded MS |
132 | } |
133 | ||
b6aeaded MS |
134 | return err; |
135 | } | |
136 | ||
c756e0a4 | 137 | void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode) |
64c6d8ed | 138 | { |
33649c91 | 139 | struct fuse_req *req = ff->reserved_req; |
b6aeaded MS |
140 | struct fuse_release_in *inarg = &req->misc.release_in; |
141 | ||
142 | inarg->fh = ff->fh; | |
fd72faac | 143 | inarg->flags = flags; |
51eb01e7 | 144 | req->in.h.opcode = opcode; |
fd72faac | 145 | req->in.h.nodeid = nodeid; |
b6aeaded MS |
146 | req->in.numargs = 1; |
147 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
148 | req->in.args[0].value = inarg; | |
fd72faac MS |
149 | } |
150 | ||
151 | int fuse_release_common(struct inode *inode, struct file *file, int isdir) | |
152 | { | |
153 | struct fuse_file *ff = file->private_data; | |
154 | if (ff) { | |
93a8c3cd MS |
155 | struct fuse_conn *fc = get_fuse_conn(inode); |
156 | ||
c756e0a4 MS |
157 | fuse_release_fill(ff, get_node_id(inode), file->f_flags, |
158 | isdir ? FUSE_RELEASEDIR : FUSE_RELEASE); | |
51eb01e7 MS |
159 | |
160 | /* Hold vfsmount and dentry until release is finished */ | |
c756e0a4 MS |
161 | ff->reserved_req->vfsmount = mntget(file->f_path.mnt); |
162 | ff->reserved_req->dentry = dget(file->f_path.dentry); | |
93a8c3cd MS |
163 | |
164 | spin_lock(&fc->lock); | |
165 | list_del(&ff->write_entry); | |
166 | spin_unlock(&fc->lock); | |
c756e0a4 MS |
167 | /* |
168 | * Normally this will send the RELEASE request, | |
169 | * however if some asynchronous READ or WRITE requests | |
170 | * are outstanding, the sending will be delayed | |
171 | */ | |
172 | fuse_file_put(ff); | |
fd72faac | 173 | } |
b6aeaded MS |
174 | |
175 | /* Return value is ignored by VFS */ | |
176 | return 0; | |
177 | } | |
178 | ||
04730fef MS |
179 | static int fuse_open(struct inode *inode, struct file *file) |
180 | { | |
181 | return fuse_open_common(inode, file, 0); | |
182 | } | |
183 | ||
184 | static int fuse_release(struct inode *inode, struct file *file) | |
185 | { | |
186 | return fuse_release_common(inode, file, 0); | |
187 | } | |
188 | ||
71421259 | 189 | /* |
9c8ef561 MS |
190 | * Scramble the ID space with XTEA, so that the value of the files_struct |
191 | * pointer is not exposed to userspace. | |
71421259 | 192 | */ |
f3332114 | 193 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 194 | { |
9c8ef561 MS |
195 | u32 *k = fc->scramble_key; |
196 | u64 v = (unsigned long) id; | |
197 | u32 v0 = v; | |
198 | u32 v1 = v >> 32; | |
199 | u32 sum = 0; | |
200 | int i; | |
201 | ||
202 | for (i = 0; i < 32; i++) { | |
203 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
204 | sum += 0x9E3779B9; | |
205 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
206 | } | |
207 | ||
208 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
209 | } |
210 | ||
75e1fcc0 | 211 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 212 | { |
7706a9d6 | 213 | struct inode *inode = file->f_path.dentry->d_inode; |
b6aeaded MS |
214 | struct fuse_conn *fc = get_fuse_conn(inode); |
215 | struct fuse_file *ff = file->private_data; | |
216 | struct fuse_req *req; | |
217 | struct fuse_flush_in inarg; | |
218 | int err; | |
219 | ||
248d86e8 MS |
220 | if (is_bad_inode(inode)) |
221 | return -EIO; | |
222 | ||
b6aeaded MS |
223 | if (fc->no_flush) |
224 | return 0; | |
225 | ||
33649c91 | 226 | req = fuse_get_req_nofail(fc, file); |
b6aeaded MS |
227 | memset(&inarg, 0, sizeof(inarg)); |
228 | inarg.fh = ff->fh; | |
9c8ef561 | 229 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
230 | req->in.h.opcode = FUSE_FLUSH; |
231 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
232 | req->in.numargs = 1; |
233 | req->in.args[0].size = sizeof(inarg); | |
234 | req->in.args[0].value = &inarg; | |
71421259 | 235 | req->force = 1; |
7c352bdf | 236 | request_send(fc, req); |
b6aeaded MS |
237 | err = req->out.h.error; |
238 | fuse_put_request(fc, req); | |
239 | if (err == -ENOSYS) { | |
240 | fc->no_flush = 1; | |
241 | err = 0; | |
242 | } | |
243 | return err; | |
244 | } | |
245 | ||
82547981 MS |
246 | int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, |
247 | int isdir) | |
b6aeaded MS |
248 | { |
249 | struct inode *inode = de->d_inode; | |
250 | struct fuse_conn *fc = get_fuse_conn(inode); | |
251 | struct fuse_file *ff = file->private_data; | |
252 | struct fuse_req *req; | |
253 | struct fuse_fsync_in inarg; | |
254 | int err; | |
255 | ||
248d86e8 MS |
256 | if (is_bad_inode(inode)) |
257 | return -EIO; | |
258 | ||
82547981 | 259 | if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) |
b6aeaded MS |
260 | return 0; |
261 | ||
ce1d5a49 MS |
262 | req = fuse_get_req(fc); |
263 | if (IS_ERR(req)) | |
264 | return PTR_ERR(req); | |
b6aeaded MS |
265 | |
266 | memset(&inarg, 0, sizeof(inarg)); | |
267 | inarg.fh = ff->fh; | |
268 | inarg.fsync_flags = datasync ? 1 : 0; | |
82547981 | 269 | req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC; |
b6aeaded | 270 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
271 | req->in.numargs = 1; |
272 | req->in.args[0].size = sizeof(inarg); | |
273 | req->in.args[0].value = &inarg; | |
274 | request_send(fc, req); | |
275 | err = req->out.h.error; | |
276 | fuse_put_request(fc, req); | |
277 | if (err == -ENOSYS) { | |
82547981 MS |
278 | if (isdir) |
279 | fc->no_fsyncdir = 1; | |
280 | else | |
281 | fc->no_fsync = 1; | |
b6aeaded MS |
282 | err = 0; |
283 | } | |
284 | return err; | |
285 | } | |
286 | ||
82547981 MS |
287 | static int fuse_fsync(struct file *file, struct dentry *de, int datasync) |
288 | { | |
289 | return fuse_fsync_common(file, de, datasync, 0); | |
290 | } | |
291 | ||
c756e0a4 | 292 | void fuse_read_fill(struct fuse_req *req, struct fuse_file *ff, |
361b1eb5 | 293 | struct inode *inode, loff_t pos, size_t count, int opcode) |
b6aeaded | 294 | { |
361b1eb5 | 295 | struct fuse_read_in *inarg = &req->misc.read_in; |
b6aeaded | 296 | |
361b1eb5 MS |
297 | inarg->fh = ff->fh; |
298 | inarg->offset = pos; | |
299 | inarg->size = count; | |
300 | req->in.h.opcode = opcode; | |
b6aeaded | 301 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
302 | req->in.numargs = 1; |
303 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 304 | req->in.args[0].value = inarg; |
b6aeaded MS |
305 | req->out.argpages = 1; |
306 | req->out.argvar = 1; | |
307 | req->out.numargs = 1; | |
308 | req->out.args[0].size = count; | |
b6aeaded MS |
309 | } |
310 | ||
8bfc016d | 311 | static size_t fuse_send_read(struct fuse_req *req, struct file *file, |
f3332114 MS |
312 | struct inode *inode, loff_t pos, size_t count, |
313 | fl_owner_t owner) | |
04730fef | 314 | { |
361b1eb5 | 315 | struct fuse_conn *fc = get_fuse_conn(inode); |
c756e0a4 | 316 | struct fuse_file *ff = file->private_data; |
f3332114 | 317 | |
c756e0a4 | 318 | fuse_read_fill(req, ff, inode, pos, count, FUSE_READ); |
f3332114 MS |
319 | if (owner != NULL) { |
320 | struct fuse_read_in *inarg = &req->misc.read_in; | |
321 | ||
322 | inarg->read_flags |= FUSE_READ_LOCKOWNER; | |
323 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
324 | } | |
361b1eb5 MS |
325 | request_send(fc, req); |
326 | return req->out.args[0].size; | |
04730fef MS |
327 | } |
328 | ||
b6aeaded MS |
329 | static int fuse_readpage(struct file *file, struct page *page) |
330 | { | |
331 | struct inode *inode = page->mapping->host; | |
332 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 MS |
333 | struct fuse_req *req; |
334 | int err; | |
335 | ||
336 | err = -EIO; | |
337 | if (is_bad_inode(inode)) | |
338 | goto out; | |
339 | ||
ce1d5a49 MS |
340 | req = fuse_get_req(fc); |
341 | err = PTR_ERR(req); | |
342 | if (IS_ERR(req)) | |
b6aeaded MS |
343 | goto out; |
344 | ||
345 | req->out.page_zeroing = 1; | |
346 | req->num_pages = 1; | |
347 | req->pages[0] = page; | |
f3332114 MS |
348 | fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE, |
349 | NULL); | |
b6aeaded MS |
350 | err = req->out.h.error; |
351 | fuse_put_request(fc, req); | |
352 | if (!err) | |
353 | SetPageUptodate(page); | |
b36c31ba | 354 | fuse_invalidate_attr(inode); /* atime changed */ |
b6aeaded MS |
355 | out: |
356 | unlock_page(page); | |
357 | return err; | |
358 | } | |
359 | ||
c1aa96a5 | 360 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 361 | { |
c1aa96a5 MS |
362 | int i; |
363 | ||
364 | fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */ | |
365 | ||
db50b96c MS |
366 | for (i = 0; i < req->num_pages; i++) { |
367 | struct page *page = req->pages[i]; | |
368 | if (!req->out.h.error) | |
369 | SetPageUptodate(page); | |
c1aa96a5 MS |
370 | else |
371 | SetPageError(page); | |
db50b96c MS |
372 | unlock_page(page); |
373 | } | |
c756e0a4 MS |
374 | if (req->ff) |
375 | fuse_file_put(req->ff); | |
c1aa96a5 MS |
376 | fuse_put_request(fc, req); |
377 | } | |
378 | ||
c756e0a4 | 379 | static void fuse_send_readpages(struct fuse_req *req, struct fuse_file *ff, |
c1aa96a5 MS |
380 | struct inode *inode) |
381 | { | |
382 | struct fuse_conn *fc = get_fuse_conn(inode); | |
383 | loff_t pos = page_offset(req->pages[0]); | |
384 | size_t count = req->num_pages << PAGE_CACHE_SHIFT; | |
385 | req->out.page_zeroing = 1; | |
c756e0a4 | 386 | fuse_read_fill(req, ff, inode, pos, count, FUSE_READ); |
9cd68455 | 387 | if (fc->async_read) { |
c756e0a4 | 388 | req->ff = fuse_file_get(ff); |
9cd68455 MS |
389 | req->end = fuse_readpages_end; |
390 | request_send_background(fc, req); | |
391 | } else { | |
392 | request_send(fc, req); | |
393 | fuse_readpages_end(fc, req); | |
394 | } | |
db50b96c MS |
395 | } |
396 | ||
c756e0a4 | 397 | struct fuse_fill_data { |
db50b96c | 398 | struct fuse_req *req; |
c756e0a4 | 399 | struct fuse_file *ff; |
db50b96c MS |
400 | struct inode *inode; |
401 | }; | |
402 | ||
403 | static int fuse_readpages_fill(void *_data, struct page *page) | |
404 | { | |
c756e0a4 | 405 | struct fuse_fill_data *data = _data; |
db50b96c MS |
406 | struct fuse_req *req = data->req; |
407 | struct inode *inode = data->inode; | |
408 | struct fuse_conn *fc = get_fuse_conn(inode); | |
409 | ||
410 | if (req->num_pages && | |
411 | (req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
412 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || | |
413 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { | |
c756e0a4 | 414 | fuse_send_readpages(req, data->ff, inode); |
ce1d5a49 MS |
415 | data->req = req = fuse_get_req(fc); |
416 | if (IS_ERR(req)) { | |
db50b96c | 417 | unlock_page(page); |
ce1d5a49 | 418 | return PTR_ERR(req); |
db50b96c | 419 | } |
db50b96c MS |
420 | } |
421 | req->pages[req->num_pages] = page; | |
422 | req->num_pages ++; | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
427 | struct list_head *pages, unsigned nr_pages) | |
428 | { | |
429 | struct inode *inode = mapping->host; | |
430 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 431 | struct fuse_fill_data data; |
db50b96c | 432 | int err; |
248d86e8 | 433 | |
1d7ea732 | 434 | err = -EIO; |
248d86e8 | 435 | if (is_bad_inode(inode)) |
2e990021 | 436 | goto out; |
248d86e8 | 437 | |
c756e0a4 | 438 | data.ff = file->private_data; |
db50b96c | 439 | data.inode = inode; |
ce1d5a49 | 440 | data.req = fuse_get_req(fc); |
1d7ea732 | 441 | err = PTR_ERR(data.req); |
ce1d5a49 | 442 | if (IS_ERR(data.req)) |
2e990021 | 443 | goto out; |
db50b96c MS |
444 | |
445 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
446 | if (!err) { |
447 | if (data.req->num_pages) | |
c756e0a4 | 448 | fuse_send_readpages(data.req, data.ff, inode); |
d3406ffa MS |
449 | else |
450 | fuse_put_request(fc, data.req); | |
451 | } | |
2e990021 | 452 | out: |
1d7ea732 | 453 | return err; |
db50b96c MS |
454 | } |
455 | ||
bcb4be80 MS |
456 | static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
457 | unsigned long nr_segs, loff_t pos) | |
458 | { | |
459 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
460 | ||
461 | if (pos + iov_length(iov, nr_segs) > i_size_read(inode)) { | |
462 | int err; | |
463 | /* | |
464 | * If trying to read past EOF, make sure the i_size | |
465 | * attribute is up-to-date. | |
466 | */ | |
467 | err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL); | |
468 | if (err) | |
469 | return err; | |
470 | } | |
471 | ||
472 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
473 | } | |
474 | ||
b25e82e5 MS |
475 | static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, |
476 | struct inode *inode, loff_t pos, size_t count, | |
477 | int writepage) | |
b6aeaded | 478 | { |
f3332114 | 479 | struct fuse_conn *fc = get_fuse_conn(inode); |
b25e82e5 MS |
480 | struct fuse_write_in *inarg = &req->misc.write.in; |
481 | struct fuse_write_out *outarg = &req->misc.write.out; | |
b6aeaded | 482 | |
b25e82e5 MS |
483 | memset(inarg, 0, sizeof(struct fuse_write_in)); |
484 | inarg->fh = ff->fh; | |
485 | inarg->offset = pos; | |
486 | inarg->size = count; | |
487 | inarg->write_flags = writepage ? FUSE_WRITE_CACHE : 0; | |
b6aeaded MS |
488 | req->in.h.opcode = FUSE_WRITE; |
489 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
490 | req->in.argpages = 1; |
491 | req->in.numargs = 2; | |
f3332114 MS |
492 | if (fc->minor < 9) |
493 | req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; | |
494 | else | |
495 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
b25e82e5 | 496 | req->in.args[0].value = inarg; |
b6aeaded MS |
497 | req->in.args[1].size = count; |
498 | req->out.numargs = 1; | |
499 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
b25e82e5 MS |
500 | req->out.args[0].value = outarg; |
501 | } | |
502 | ||
503 | static size_t fuse_send_write(struct fuse_req *req, struct file *file, | |
f3332114 MS |
504 | struct inode *inode, loff_t pos, size_t count, |
505 | fl_owner_t owner) | |
b25e82e5 MS |
506 | { |
507 | struct fuse_conn *fc = get_fuse_conn(inode); | |
508 | fuse_write_fill(req, file->private_data, inode, pos, count, 0); | |
f3332114 MS |
509 | if (owner != NULL) { |
510 | struct fuse_write_in *inarg = &req->misc.write.in; | |
511 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; | |
512 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
513 | } | |
7c352bdf | 514 | request_send(fc, req); |
b25e82e5 | 515 | return req->misc.write.out.size; |
b6aeaded MS |
516 | } |
517 | ||
5e6f58a1 NP |
518 | static int fuse_write_begin(struct file *file, struct address_space *mapping, |
519 | loff_t pos, unsigned len, unsigned flags, | |
520 | struct page **pagep, void **fsdata) | |
b6aeaded | 521 | { |
5e6f58a1 NP |
522 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
523 | ||
524 | *pagep = __grab_cache_page(mapping, index); | |
525 | if (!*pagep) | |
526 | return -ENOMEM; | |
b6aeaded MS |
527 | return 0; |
528 | } | |
529 | ||
5e6f58a1 NP |
530 | static int fuse_buffered_write(struct file *file, struct inode *inode, |
531 | loff_t pos, unsigned count, struct page *page) | |
b6aeaded MS |
532 | { |
533 | int err; | |
04730fef | 534 | size_t nres; |
b6aeaded | 535 | struct fuse_conn *fc = get_fuse_conn(inode); |
1fb69e78 | 536 | struct fuse_inode *fi = get_fuse_inode(inode); |
5e6f58a1 | 537 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
248d86e8 MS |
538 | struct fuse_req *req; |
539 | ||
540 | if (is_bad_inode(inode)) | |
541 | return -EIO; | |
542 | ||
ce1d5a49 MS |
543 | req = fuse_get_req(fc); |
544 | if (IS_ERR(req)) | |
545 | return PTR_ERR(req); | |
b6aeaded MS |
546 | |
547 | req->num_pages = 1; | |
548 | req->pages[0] = page; | |
549 | req->page_offset = offset; | |
f3332114 | 550 | nres = fuse_send_write(req, file, inode, pos, count, NULL); |
b6aeaded MS |
551 | err = req->out.h.error; |
552 | fuse_put_request(fc, req); | |
5e6f58a1 | 553 | if (!err && !nres) |
b6aeaded MS |
554 | err = -EIO; |
555 | if (!err) { | |
5e6f58a1 | 556 | pos += nres; |
9ffbb916 | 557 | spin_lock(&fc->lock); |
1fb69e78 | 558 | fi->attr_version = ++fc->attr_version; |
9ffbb916 | 559 | if (pos > inode->i_size) |
b6aeaded | 560 | i_size_write(inode, pos); |
9ffbb916 | 561 | spin_unlock(&fc->lock); |
b6aeaded | 562 | |
5e6f58a1 | 563 | if (count == PAGE_CACHE_SIZE) |
b6aeaded | 564 | SetPageUptodate(page); |
b36c31ba MS |
565 | } |
566 | fuse_invalidate_attr(inode); | |
5e6f58a1 NP |
567 | return err ? err : nres; |
568 | } | |
569 | ||
570 | static int fuse_write_end(struct file *file, struct address_space *mapping, | |
571 | loff_t pos, unsigned len, unsigned copied, | |
572 | struct page *page, void *fsdata) | |
573 | { | |
574 | struct inode *inode = mapping->host; | |
575 | int res = 0; | |
576 | ||
577 | if (copied) | |
578 | res = fuse_buffered_write(file, inode, pos, copied, page); | |
579 | ||
580 | unlock_page(page); | |
581 | page_cache_release(page); | |
582 | return res; | |
b6aeaded MS |
583 | } |
584 | ||
413ef8cb MS |
585 | static void fuse_release_user_pages(struct fuse_req *req, int write) |
586 | { | |
587 | unsigned i; | |
588 | ||
589 | for (i = 0; i < req->num_pages; i++) { | |
590 | struct page *page = req->pages[i]; | |
591 | if (write) | |
592 | set_page_dirty_lock(page); | |
593 | put_page(page); | |
594 | } | |
595 | } | |
596 | ||
597 | static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, | |
598 | unsigned nbytes, int write) | |
599 | { | |
600 | unsigned long user_addr = (unsigned long) buf; | |
601 | unsigned offset = user_addr & ~PAGE_MASK; | |
602 | int npages; | |
603 | ||
604 | /* This doesn't work with nfsd */ | |
605 | if (!current->mm) | |
606 | return -EPERM; | |
607 | ||
608 | nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); | |
609 | npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
6ad84aca | 610 | npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ); |
413ef8cb MS |
611 | down_read(¤t->mm->mmap_sem); |
612 | npages = get_user_pages(current, current->mm, user_addr, npages, write, | |
613 | 0, req->pages, NULL); | |
614 | up_read(¤t->mm->mmap_sem); | |
615 | if (npages < 0) | |
616 | return npages; | |
617 | ||
618 | req->num_pages = npages; | |
619 | req->page_offset = offset; | |
620 | return 0; | |
621 | } | |
622 | ||
623 | static ssize_t fuse_direct_io(struct file *file, const char __user *buf, | |
624 | size_t count, loff_t *ppos, int write) | |
625 | { | |
7706a9d6 | 626 | struct inode *inode = file->f_path.dentry->d_inode; |
413ef8cb MS |
627 | struct fuse_conn *fc = get_fuse_conn(inode); |
628 | size_t nmax = write ? fc->max_write : fc->max_read; | |
629 | loff_t pos = *ppos; | |
630 | ssize_t res = 0; | |
248d86e8 MS |
631 | struct fuse_req *req; |
632 | ||
633 | if (is_bad_inode(inode)) | |
634 | return -EIO; | |
635 | ||
ce1d5a49 MS |
636 | req = fuse_get_req(fc); |
637 | if (IS_ERR(req)) | |
638 | return PTR_ERR(req); | |
413ef8cb MS |
639 | |
640 | while (count) { | |
413ef8cb MS |
641 | size_t nres; |
642 | size_t nbytes = min(count, nmax); | |
643 | int err = fuse_get_user_pages(req, buf, nbytes, !write); | |
644 | if (err) { | |
645 | res = err; | |
646 | break; | |
647 | } | |
6ad84aca MS |
648 | nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset; |
649 | nbytes = min(count, nbytes); | |
413ef8cb | 650 | if (write) |
f3332114 MS |
651 | nres = fuse_send_write(req, file, inode, pos, nbytes, |
652 | current->files); | |
413ef8cb | 653 | else |
f3332114 MS |
654 | nres = fuse_send_read(req, file, inode, pos, nbytes, |
655 | current->files); | |
413ef8cb MS |
656 | fuse_release_user_pages(req, !write); |
657 | if (req->out.h.error) { | |
658 | if (!res) | |
659 | res = req->out.h.error; | |
660 | break; | |
661 | } else if (nres > nbytes) { | |
662 | res = -EIO; | |
663 | break; | |
664 | } | |
665 | count -= nres; | |
666 | res += nres; | |
667 | pos += nres; | |
668 | buf += nres; | |
669 | if (nres != nbytes) | |
670 | break; | |
56cf34ff MS |
671 | if (count) { |
672 | fuse_put_request(fc, req); | |
673 | req = fuse_get_req(fc); | |
674 | if (IS_ERR(req)) | |
675 | break; | |
676 | } | |
413ef8cb MS |
677 | } |
678 | fuse_put_request(fc, req); | |
679 | if (res > 0) { | |
9ffbb916 MS |
680 | if (write) { |
681 | spin_lock(&fc->lock); | |
682 | if (pos > inode->i_size) | |
683 | i_size_write(inode, pos); | |
684 | spin_unlock(&fc->lock); | |
685 | } | |
413ef8cb | 686 | *ppos = pos; |
b36c31ba MS |
687 | } |
688 | fuse_invalidate_attr(inode); | |
413ef8cb MS |
689 | |
690 | return res; | |
691 | } | |
692 | ||
693 | static ssize_t fuse_direct_read(struct file *file, char __user *buf, | |
694 | size_t count, loff_t *ppos) | |
695 | { | |
696 | return fuse_direct_io(file, buf, count, ppos, 0); | |
697 | } | |
698 | ||
699 | static ssize_t fuse_direct_write(struct file *file, const char __user *buf, | |
700 | size_t count, loff_t *ppos) | |
701 | { | |
7706a9d6 | 702 | struct inode *inode = file->f_path.dentry->d_inode; |
413ef8cb MS |
703 | ssize_t res; |
704 | /* Don't allow parallel writes to the same file */ | |
1b1dcc1b | 705 | mutex_lock(&inode->i_mutex); |
889f7848 MS |
706 | res = generic_write_checks(file, ppos, &count, 0); |
707 | if (!res) | |
708 | res = fuse_direct_io(file, buf, count, ppos, 1); | |
1b1dcc1b | 709 | mutex_unlock(&inode->i_mutex); |
413ef8cb MS |
710 | return res; |
711 | } | |
712 | ||
b6aeaded MS |
713 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) |
714 | { | |
715 | if ((vma->vm_flags & VM_SHARED)) { | |
716 | if ((vma->vm_flags & VM_WRITE)) | |
717 | return -ENODEV; | |
718 | else | |
719 | vma->vm_flags &= ~VM_MAYWRITE; | |
720 | } | |
721 | return generic_file_mmap(file, vma); | |
722 | } | |
723 | ||
724 | static int fuse_set_page_dirty(struct page *page) | |
725 | { | |
726 | printk("fuse_set_page_dirty: should not happen\n"); | |
727 | dump_stack(); | |
728 | return 0; | |
729 | } | |
730 | ||
71421259 MS |
731 | static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, |
732 | struct file_lock *fl) | |
733 | { | |
734 | switch (ffl->type) { | |
735 | case F_UNLCK: | |
736 | break; | |
737 | ||
738 | case F_RDLCK: | |
739 | case F_WRLCK: | |
740 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
741 | ffl->end < ffl->start) | |
742 | return -EIO; | |
743 | ||
744 | fl->fl_start = ffl->start; | |
745 | fl->fl_end = ffl->end; | |
746 | fl->fl_pid = ffl->pid; | |
747 | break; | |
748 | ||
749 | default: | |
750 | return -EIO; | |
751 | } | |
752 | fl->fl_type = ffl->type; | |
753 | return 0; | |
754 | } | |
755 | ||
756 | static void fuse_lk_fill(struct fuse_req *req, struct file *file, | |
a9ff4f87 MS |
757 | const struct file_lock *fl, int opcode, pid_t pid, |
758 | int flock) | |
71421259 | 759 | { |
7706a9d6 | 760 | struct inode *inode = file->f_path.dentry->d_inode; |
9c8ef561 | 761 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 MS |
762 | struct fuse_file *ff = file->private_data; |
763 | struct fuse_lk_in *arg = &req->misc.lk_in; | |
764 | ||
765 | arg->fh = ff->fh; | |
9c8ef561 | 766 | arg->owner = fuse_lock_owner_id(fc, fl->fl_owner); |
71421259 MS |
767 | arg->lk.start = fl->fl_start; |
768 | arg->lk.end = fl->fl_end; | |
769 | arg->lk.type = fl->fl_type; | |
770 | arg->lk.pid = pid; | |
a9ff4f87 MS |
771 | if (flock) |
772 | arg->lk_flags |= FUSE_LK_FLOCK; | |
71421259 MS |
773 | req->in.h.opcode = opcode; |
774 | req->in.h.nodeid = get_node_id(inode); | |
775 | req->in.numargs = 1; | |
776 | req->in.args[0].size = sizeof(*arg); | |
777 | req->in.args[0].value = arg; | |
778 | } | |
779 | ||
780 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
781 | { | |
7706a9d6 | 782 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
783 | struct fuse_conn *fc = get_fuse_conn(inode); |
784 | struct fuse_req *req; | |
785 | struct fuse_lk_out outarg; | |
786 | int err; | |
787 | ||
788 | req = fuse_get_req(fc); | |
789 | if (IS_ERR(req)) | |
790 | return PTR_ERR(req); | |
791 | ||
a9ff4f87 | 792 | fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0); |
71421259 MS |
793 | req->out.numargs = 1; |
794 | req->out.args[0].size = sizeof(outarg); | |
795 | req->out.args[0].value = &outarg; | |
796 | request_send(fc, req); | |
797 | err = req->out.h.error; | |
798 | fuse_put_request(fc, req); | |
799 | if (!err) | |
800 | err = convert_fuse_file_lock(&outarg.lk, fl); | |
801 | ||
802 | return err; | |
803 | } | |
804 | ||
a9ff4f87 | 805 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 806 | { |
7706a9d6 | 807 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
808 | struct fuse_conn *fc = get_fuse_conn(inode); |
809 | struct fuse_req *req; | |
810 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; | |
811 | pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0; | |
812 | int err; | |
813 | ||
814 | /* Unlock on close is handled by the flush method */ | |
815 | if (fl->fl_flags & FL_CLOSE) | |
816 | return 0; | |
817 | ||
818 | req = fuse_get_req(fc); | |
819 | if (IS_ERR(req)) | |
820 | return PTR_ERR(req); | |
821 | ||
a9ff4f87 | 822 | fuse_lk_fill(req, file, fl, opcode, pid, flock); |
71421259 MS |
823 | request_send(fc, req); |
824 | err = req->out.h.error; | |
a4d27e75 MS |
825 | /* locking is restartable */ |
826 | if (err == -EINTR) | |
827 | err = -ERESTARTSYS; | |
71421259 MS |
828 | fuse_put_request(fc, req); |
829 | return err; | |
830 | } | |
831 | ||
832 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
833 | { | |
7706a9d6 | 834 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
835 | struct fuse_conn *fc = get_fuse_conn(inode); |
836 | int err; | |
837 | ||
838 | if (cmd == F_GETLK) { | |
839 | if (fc->no_lock) { | |
9d6a8c5c | 840 | posix_test_lock(file, fl); |
71421259 MS |
841 | err = 0; |
842 | } else | |
843 | err = fuse_getlk(file, fl); | |
844 | } else { | |
845 | if (fc->no_lock) | |
846 | err = posix_lock_file_wait(file, fl); | |
847 | else | |
a9ff4f87 | 848 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
849 | } |
850 | return err; | |
851 | } | |
852 | ||
a9ff4f87 MS |
853 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
854 | { | |
855 | struct inode *inode = file->f_path.dentry->d_inode; | |
856 | struct fuse_conn *fc = get_fuse_conn(inode); | |
857 | int err; | |
858 | ||
859 | if (fc->no_lock) { | |
860 | err = flock_lock_file_wait(file, fl); | |
861 | } else { | |
862 | /* emulate flock with POSIX locks */ | |
863 | fl->fl_owner = (fl_owner_t) file; | |
864 | err = fuse_setlk(file, fl, 1); | |
865 | } | |
866 | ||
867 | return err; | |
868 | } | |
869 | ||
b2d2272f MS |
870 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
871 | { | |
872 | struct inode *inode = mapping->host; | |
873 | struct fuse_conn *fc = get_fuse_conn(inode); | |
874 | struct fuse_req *req; | |
875 | struct fuse_bmap_in inarg; | |
876 | struct fuse_bmap_out outarg; | |
877 | int err; | |
878 | ||
879 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
880 | return 0; | |
881 | ||
882 | req = fuse_get_req(fc); | |
883 | if (IS_ERR(req)) | |
884 | return 0; | |
885 | ||
886 | memset(&inarg, 0, sizeof(inarg)); | |
887 | inarg.block = block; | |
888 | inarg.blocksize = inode->i_sb->s_blocksize; | |
889 | req->in.h.opcode = FUSE_BMAP; | |
890 | req->in.h.nodeid = get_node_id(inode); | |
891 | req->in.numargs = 1; | |
892 | req->in.args[0].size = sizeof(inarg); | |
893 | req->in.args[0].value = &inarg; | |
894 | req->out.numargs = 1; | |
895 | req->out.args[0].size = sizeof(outarg); | |
896 | req->out.args[0].value = &outarg; | |
897 | request_send(fc, req); | |
898 | err = req->out.h.error; | |
899 | fuse_put_request(fc, req); | |
900 | if (err == -ENOSYS) | |
901 | fc->no_bmap = 1; | |
902 | ||
903 | return err ? 0 : outarg.block; | |
904 | } | |
905 | ||
4b6f5d20 | 906 | static const struct file_operations fuse_file_operations = { |
b6aeaded | 907 | .llseek = generic_file_llseek, |
543ade1f | 908 | .read = do_sync_read, |
bcb4be80 | 909 | .aio_read = fuse_file_aio_read, |
543ade1f BP |
910 | .write = do_sync_write, |
911 | .aio_write = generic_file_aio_write, | |
b6aeaded MS |
912 | .mmap = fuse_file_mmap, |
913 | .open = fuse_open, | |
914 | .flush = fuse_flush, | |
915 | .release = fuse_release, | |
916 | .fsync = fuse_fsync, | |
71421259 | 917 | .lock = fuse_file_lock, |
a9ff4f87 | 918 | .flock = fuse_file_flock, |
5ffc4ef4 | 919 | .splice_read = generic_file_splice_read, |
b6aeaded MS |
920 | }; |
921 | ||
4b6f5d20 | 922 | static const struct file_operations fuse_direct_io_file_operations = { |
413ef8cb MS |
923 | .llseek = generic_file_llseek, |
924 | .read = fuse_direct_read, | |
925 | .write = fuse_direct_write, | |
926 | .open = fuse_open, | |
927 | .flush = fuse_flush, | |
928 | .release = fuse_release, | |
929 | .fsync = fuse_fsync, | |
71421259 | 930 | .lock = fuse_file_lock, |
a9ff4f87 | 931 | .flock = fuse_file_flock, |
5ffc4ef4 | 932 | /* no mmap and splice_read */ |
413ef8cb MS |
933 | }; |
934 | ||
f5e54d6e | 935 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 936 | .readpage = fuse_readpage, |
5e6f58a1 NP |
937 | .write_begin = fuse_write_begin, |
938 | .write_end = fuse_write_end, | |
db50b96c | 939 | .readpages = fuse_readpages, |
b6aeaded | 940 | .set_page_dirty = fuse_set_page_dirty, |
b2d2272f | 941 | .bmap = fuse_bmap, |
b6aeaded MS |
942 | }; |
943 | ||
944 | void fuse_init_file_inode(struct inode *inode) | |
945 | { | |
45323fb7 MS |
946 | inode->i_fop = &fuse_file_operations; |
947 | inode->i_data.a_ops = &fuse_file_aops; | |
b6aeaded | 948 | } |