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056a1eb7 SF |
1 | /* $Id: regops.c $ */ |
2 | /** @file | |
3 | * vboxsf - VBox Linux Shared Folders, Regular file inode and file operations. | |
4 | */ | |
5 | ||
6 | /* | |
7 | * Copyright (C) 2006-2016 Oracle Corporation | |
8 | * | |
9 | * This file is part of VirtualBox Open Source Edition (OSE), as | |
10 | * available from http://www.virtualbox.org. This file is free software; | |
11 | * you can redistribute it and/or modify it under the terms of the GNU | |
12 | * General Public License (GPL) as published by the Free Software | |
13 | * Foundation, in version 2 as it comes in the "COPYING" file of the | |
14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the | |
15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Limitations: only COW memory mapping is supported | |
20 | */ | |
21 | ||
22 | #include "vfsmod.h" | |
23 | ||
24 | static void *alloc_bounce_buffer(size_t *tmp_sizep, PRTCCPHYS physp, size_t | |
25 | xfer_size, const char *caller) | |
26 | { | |
27 | size_t tmp_size; | |
28 | void *tmp; | |
29 | ||
30 | /* try for big first. */ | |
31 | tmp_size = RT_ALIGN_Z(xfer_size, PAGE_SIZE); | |
32 | if (tmp_size > 16U*_1K) | |
33 | tmp_size = 16U*_1K; | |
34 | tmp = kmalloc(tmp_size, GFP_KERNEL); | |
35 | if (!tmp) | |
36 | { | |
37 | /* fall back on a page sized buffer. */ | |
38 | tmp = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
39 | if (!tmp) | |
40 | { | |
41 | LogRel(("%s: could not allocate bounce buffer for xfer_size=%zu %s\n", caller, xfer_size)); | |
42 | return NULL; | |
43 | } | |
44 | tmp_size = PAGE_SIZE; | |
45 | } | |
46 | ||
47 | *tmp_sizep = tmp_size; | |
48 | *physp = virt_to_phys(tmp); | |
49 | return tmp; | |
50 | } | |
51 | ||
52 | static void free_bounce_buffer(void *tmp) | |
53 | { | |
54 | kfree (tmp); | |
55 | } | |
56 | ||
57 | ||
58 | /* fops */ | |
59 | static int sf_reg_read_aux(const char *caller, struct sf_glob_info *sf_g, | |
60 | struct sf_reg_info *sf_r, void *buf, | |
61 | uint32_t *nread, uint64_t pos) | |
62 | { | |
63 | /** @todo bird: yes, kmap() and kmalloc() input only. Since the buffer is | |
64 | * contiguous in physical memory (kmalloc or single page), we should | |
65 | * use a physical address here to speed things up. */ | |
66 | int rc = VbglR0SfRead(&client_handle, &sf_g->map, sf_r->handle, | |
67 | pos, nread, buf, false /* already locked? */); | |
68 | if (RT_FAILURE(rc)) | |
69 | { | |
70 | LogFunc(("VbglR0SfRead failed. caller=%s, rc=%Rrc\n", caller, rc)); | |
71 | return -EPROTO; | |
72 | } | |
73 | return 0; | |
74 | } | |
75 | ||
76 | static int sf_reg_write_aux(const char *caller, struct sf_glob_info *sf_g, | |
77 | struct sf_reg_info *sf_r, void *buf, | |
78 | uint32_t *nwritten, uint64_t pos) | |
79 | { | |
80 | /** @todo bird: yes, kmap() and kmalloc() input only. Since the buffer is | |
81 | * contiguous in physical memory (kmalloc or single page), we should | |
82 | * use a physical address here to speed things up. */ | |
83 | int rc = VbglR0SfWrite(&client_handle, &sf_g->map, sf_r->handle, | |
84 | pos, nwritten, buf, false /* already locked? */); | |
85 | if (RT_FAILURE(rc)) | |
86 | { | |
87 | LogFunc(("VbglR0SfWrite failed. caller=%s, rc=%Rrc\n", | |
88 | caller, rc)); | |
89 | return -EPROTO; | |
90 | } | |
91 | return 0; | |
92 | } | |
93 | ||
94 | /** | |
95 | * Read from a regular file. | |
96 | * | |
97 | * @param file the file | |
98 | * @param buf the buffer | |
99 | * @param size length of the buffer | |
100 | * @param off offset within the file | |
101 | * @returns the number of read bytes on success, Linux error code otherwise | |
102 | */ | |
103 | static ssize_t sf_reg_read(struct file *file, char *buf, size_t size, loff_t *off) | |
104 | { | |
105 | int err; | |
106 | void *tmp; | |
107 | RTCCPHYS tmp_phys; | |
108 | size_t tmp_size; | |
109 | size_t left = size; | |
110 | ssize_t total_bytes_read = 0; | |
111 | struct inode *inode = GET_F_DENTRY(file)->d_inode; | |
112 | struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb); | |
113 | struct sf_reg_info *sf_r = file->private_data; | |
114 | loff_t pos = *off; | |
115 | ||
116 | TRACE(); | |
117 | if (!S_ISREG(inode->i_mode)) | |
118 | { | |
119 | LogFunc(("read from non regular file %d\n", inode->i_mode)); | |
120 | return -EINVAL; | |
121 | } | |
122 | ||
123 | /** XXX Check read permission according to inode->i_mode! */ | |
124 | ||
125 | if (!size) | |
126 | return 0; | |
127 | ||
128 | tmp = alloc_bounce_buffer(&tmp_size, &tmp_phys, size, __PRETTY_FUNCTION__); | |
129 | if (!tmp) | |
130 | return -ENOMEM; | |
131 | ||
132 | while (left) | |
133 | { | |
134 | uint32_t to_read, nread; | |
135 | ||
136 | to_read = tmp_size; | |
137 | if (to_read > left) | |
138 | to_read = (uint32_t) left; | |
139 | ||
140 | nread = to_read; | |
141 | ||
142 | err = sf_reg_read_aux(__func__, sf_g, sf_r, tmp, &nread, pos); | |
143 | if (err) | |
144 | goto fail; | |
145 | ||
146 | if (copy_to_user(buf, tmp, nread)) | |
147 | { | |
148 | err = -EFAULT; | |
149 | goto fail; | |
150 | } | |
151 | ||
152 | pos += nread; | |
153 | left -= nread; | |
154 | buf += nread; | |
155 | total_bytes_read += nread; | |
156 | if (nread != to_read) | |
157 | break; | |
158 | } | |
159 | ||
160 | *off += total_bytes_read; | |
161 | free_bounce_buffer(tmp); | |
162 | return total_bytes_read; | |
163 | ||
164 | fail: | |
165 | free_bounce_buffer(tmp); | |
166 | return err; | |
167 | } | |
168 | ||
169 | /** | |
170 | * Write to a regular file. | |
171 | * | |
172 | * @param file the file | |
173 | * @param buf the buffer | |
174 | * @param size length of the buffer | |
175 | * @param off offset within the file | |
176 | * @returns the number of written bytes on success, Linux error code otherwise | |
177 | */ | |
178 | static ssize_t sf_reg_write(struct file *file, const char *buf, size_t size, loff_t *off) | |
179 | { | |
180 | int err; | |
181 | void *tmp; | |
182 | RTCCPHYS tmp_phys; | |
183 | size_t tmp_size; | |
184 | size_t left = size; | |
185 | ssize_t total_bytes_written = 0; | |
186 | struct inode *inode = GET_F_DENTRY(file)->d_inode; | |
187 | struct sf_inode_info *sf_i = GET_INODE_INFO(inode); | |
188 | struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb); | |
189 | struct sf_reg_info *sf_r = file->private_data; | |
190 | loff_t pos; | |
191 | ||
192 | TRACE(); | |
193 | BUG_ON(!sf_i); | |
194 | BUG_ON(!sf_g); | |
195 | BUG_ON(!sf_r); | |
196 | ||
197 | if (!S_ISREG(inode->i_mode)) | |
198 | { | |
199 | LogFunc(("write to non regular file %d\n", inode->i_mode)); | |
200 | return -EINVAL; | |
201 | } | |
202 | ||
203 | pos = *off; | |
204 | if (file->f_flags & O_APPEND) | |
205 | { | |
206 | pos = inode->i_size; | |
207 | *off = pos; | |
208 | } | |
209 | ||
210 | /** XXX Check write permission according to inode->i_mode! */ | |
211 | ||
212 | if (!size) | |
213 | return 0; | |
214 | ||
215 | tmp = alloc_bounce_buffer(&tmp_size, &tmp_phys, size, __PRETTY_FUNCTION__); | |
216 | if (!tmp) | |
217 | return -ENOMEM; | |
218 | ||
219 | while (left) | |
220 | { | |
221 | uint32_t to_write, nwritten; | |
222 | ||
223 | to_write = tmp_size; | |
224 | if (to_write > left) | |
225 | to_write = (uint32_t) left; | |
226 | ||
227 | nwritten = to_write; | |
228 | ||
229 | if (copy_from_user(tmp, buf, to_write)) | |
230 | { | |
231 | err = -EFAULT; | |
232 | goto fail; | |
233 | } | |
234 | ||
6d209b23 SF |
235 | err = VbglR0SfWritePhysCont(&client_handle, &sf_g->map, sf_r->handle, |
236 | pos, &nwritten, tmp_phys); | |
056a1eb7 SF |
237 | if (err) |
238 | goto fail; | |
239 | ||
240 | pos += nwritten; | |
241 | left -= nwritten; | |
242 | buf += nwritten; | |
243 | total_bytes_written += nwritten; | |
244 | if (nwritten != to_write) | |
245 | break; | |
246 | } | |
247 | ||
248 | *off += total_bytes_written; | |
249 | if (*off > inode->i_size) | |
250 | inode->i_size = *off; | |
251 | ||
252 | sf_i->force_restat = 1; | |
253 | free_bounce_buffer(tmp); | |
254 | return total_bytes_written; | |
255 | ||
256 | fail: | |
257 | free_bounce_buffer(tmp); | |
258 | return err; | |
259 | } | |
260 | ||
261 | /** | |
262 | * Open a regular file. | |
263 | * | |
264 | * @param inode the inode | |
265 | * @param file the file | |
266 | * @returns 0 on success, Linux error code otherwise | |
267 | */ | |
268 | static int sf_reg_open(struct inode *inode, struct file *file) | |
269 | { | |
270 | int rc, rc_linux = 0; | |
271 | struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb); | |
272 | struct sf_inode_info *sf_i = GET_INODE_INFO(inode); | |
273 | struct sf_reg_info *sf_r; | |
274 | SHFLCREATEPARMS params; | |
275 | ||
276 | TRACE(); | |
277 | BUG_ON(!sf_g); | |
278 | BUG_ON(!sf_i); | |
279 | ||
280 | LogFunc(("open %s\n", sf_i->path->String.utf8)); | |
281 | ||
282 | sf_r = kmalloc(sizeof(*sf_r), GFP_KERNEL); | |
283 | if (!sf_r) | |
284 | { | |
285 | LogRelFunc(("could not allocate reg info\n")); | |
286 | return -ENOMEM; | |
287 | } | |
288 | ||
289 | /* Already open? */ | |
290 | if (sf_i->handle != SHFL_HANDLE_NIL) | |
291 | { | |
292 | /* | |
293 | * This inode was created with sf_create_aux(). Check the CreateFlags: | |
294 | * O_CREAT, O_TRUNC: inherent true (file was just created). Not sure | |
295 | * about the access flags (SHFL_CF_ACCESS_*). | |
296 | */ | |
297 | sf_i->force_restat = 1; | |
298 | sf_r->handle = sf_i->handle; | |
299 | sf_i->handle = SHFL_HANDLE_NIL; | |
300 | sf_i->file = file; | |
301 | file->private_data = sf_r; | |
302 | return 0; | |
303 | } | |
304 | ||
305 | RT_ZERO(params); | |
306 | params.Handle = SHFL_HANDLE_NIL; | |
307 | /* We check the value of params.Handle afterwards to find out if | |
308 | * the call succeeded or failed, as the API does not seem to cleanly | |
309 | * distinguish error and informational messages. | |
310 | * | |
311 | * Furthermore, we must set params.Handle to SHFL_HANDLE_NIL to | |
312 | * make the shared folders host service use our fMode parameter */ | |
313 | ||
314 | if (file->f_flags & O_CREAT) | |
315 | { | |
316 | LogFunc(("O_CREAT set\n")); | |
317 | params.CreateFlags |= SHFL_CF_ACT_CREATE_IF_NEW; | |
318 | /* We ignore O_EXCL, as the Linux kernel seems to call create | |
319 | beforehand itself, so O_EXCL should always fail. */ | |
320 | if (file->f_flags & O_TRUNC) | |
321 | { | |
322 | LogFunc(("O_TRUNC set\n")); | |
323 | params.CreateFlags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS; | |
324 | } | |
325 | else | |
326 | params.CreateFlags |= SHFL_CF_ACT_OPEN_IF_EXISTS; | |
327 | } | |
328 | else | |
329 | { | |
330 | params.CreateFlags |= SHFL_CF_ACT_FAIL_IF_NEW; | |
331 | if (file->f_flags & O_TRUNC) | |
332 | { | |
333 | LogFunc(("O_TRUNC set\n")); | |
334 | params.CreateFlags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS; | |
335 | } | |
336 | } | |
337 | ||
338 | switch (file->f_flags & O_ACCMODE) | |
339 | { | |
340 | case O_RDONLY: | |
341 | params.CreateFlags |= SHFL_CF_ACCESS_READ; | |
342 | break; | |
343 | ||
344 | case O_WRONLY: | |
345 | params.CreateFlags |= SHFL_CF_ACCESS_WRITE; | |
346 | break; | |
347 | ||
348 | case O_RDWR: | |
349 | params.CreateFlags |= SHFL_CF_ACCESS_READWRITE; | |
350 | break; | |
351 | ||
352 | default: | |
353 | BUG (); | |
354 | } | |
355 | ||
356 | if (file->f_flags & O_APPEND) | |
357 | { | |
358 | LogFunc(("O_APPEND set\n")); | |
359 | params.CreateFlags |= SHFL_CF_ACCESS_APPEND; | |
360 | } | |
361 | ||
362 | params.Info.Attr.fMode = inode->i_mode; | |
363 | LogFunc(("sf_reg_open: calling VbglR0SfCreate, file %s, flags=%#x, %#x\n", | |
364 | sf_i->path->String.utf8 , file->f_flags, params.CreateFlags)); | |
365 | rc = VbglR0SfCreate(&client_handle, &sf_g->map, sf_i->path, ¶ms); | |
366 | if (RT_FAILURE(rc)) | |
367 | { | |
368 | LogFunc(("VbglR0SfCreate failed flags=%d,%#x rc=%Rrc\n", | |
369 | file->f_flags, params.CreateFlags, rc)); | |
370 | kfree(sf_r); | |
371 | return -RTErrConvertToErrno(rc); | |
372 | } | |
373 | ||
374 | if (SHFL_HANDLE_NIL == params.Handle) | |
375 | { | |
376 | switch (params.Result) | |
377 | { | |
378 | case SHFL_PATH_NOT_FOUND: | |
379 | case SHFL_FILE_NOT_FOUND: | |
380 | rc_linux = -ENOENT; | |
381 | break; | |
382 | case SHFL_FILE_EXISTS: | |
383 | rc_linux = -EEXIST; | |
384 | break; | |
385 | default: | |
386 | break; | |
387 | } | |
388 | } | |
389 | ||
390 | sf_i->force_restat = 1; | |
391 | sf_r->handle = params.Handle; | |
392 | sf_i->file = file; | |
393 | file->private_data = sf_r; | |
394 | return rc_linux; | |
395 | } | |
396 | ||
397 | /** | |
398 | * Close a regular file. | |
399 | * | |
400 | * @param inode the inode | |
401 | * @param file the file | |
402 | * @returns 0 on success, Linux error code otherwise | |
403 | */ | |
404 | static int sf_reg_release(struct inode *inode, struct file *file) | |
405 | { | |
406 | int rc; | |
407 | struct sf_reg_info *sf_r; | |
408 | struct sf_glob_info *sf_g; | |
409 | struct sf_inode_info *sf_i = GET_INODE_INFO(inode); | |
410 | ||
411 | TRACE(); | |
412 | sf_g = GET_GLOB_INFO(inode->i_sb); | |
413 | sf_r = file->private_data; | |
414 | ||
415 | BUG_ON(!sf_g); | |
416 | BUG_ON(!sf_r); | |
417 | ||
418 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25) | |
419 | /* See the smbfs source (file.c). mmap in particular can cause data to be | |
420 | * written to the file after it is closed, which we can't cope with. We | |
421 | * copy and paste the body of filemap_write_and_wait() here as it was not | |
422 | * defined before 2.6.6 and not exported until quite a bit later. */ | |
423 | /* filemap_write_and_wait(inode->i_mapping); */ | |
424 | if ( inode->i_mapping->nrpages | |
425 | && filemap_fdatawrite(inode->i_mapping) != -EIO) | |
426 | filemap_fdatawait(inode->i_mapping); | |
427 | #endif | |
428 | rc = VbglR0SfClose(&client_handle, &sf_g->map, sf_r->handle); | |
429 | if (RT_FAILURE(rc)) | |
430 | LogFunc(("VbglR0SfClose failed rc=%Rrc\n", rc)); | |
431 | ||
432 | kfree(sf_r); | |
433 | sf_i->file = NULL; | |
434 | sf_i->handle = SHFL_HANDLE_NIL; | |
435 | file->private_data = NULL; | |
436 | return 0; | |
437 | } | |
438 | ||
439 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) | |
440 | static int sf_reg_fault(struct vm_fault *vmf) | |
441 | #elif LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25) | |
442 | static int sf_reg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
443 | #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) | |
444 | static struct page *sf_reg_nopage(struct vm_area_struct *vma, unsigned long vaddr, int *type) | |
445 | # define SET_TYPE(t) *type = (t) | |
446 | #else /* LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) */ | |
447 | static struct page *sf_reg_nopage(struct vm_area_struct *vma, unsigned long vaddr, int unused) | |
448 | # define SET_TYPE(t) | |
449 | #endif | |
450 | { | |
451 | struct page *page; | |
452 | char *buf; | |
453 | loff_t off; | |
454 | uint32_t nread = PAGE_SIZE; | |
455 | int err; | |
456 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) | |
457 | struct vm_area_struct *vma = vmf->vma; | |
458 | #endif | |
459 | struct file *file = vma->vm_file; | |
460 | struct inode *inode = GET_F_DENTRY(file)->d_inode; | |
461 | struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb); | |
462 | struct sf_reg_info *sf_r = file->private_data; | |
463 | ||
464 | TRACE(); | |
465 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25) | |
466 | if (vmf->pgoff > vma->vm_end) | |
467 | return VM_FAULT_SIGBUS; | |
468 | #else | |
469 | if (vaddr > vma->vm_end) | |
470 | { | |
471 | SET_TYPE(VM_FAULT_SIGBUS); | |
472 | return NOPAGE_SIGBUS; | |
473 | } | |
474 | #endif | |
475 | ||
476 | /* Don't use GFP_HIGHUSER as long as sf_reg_read_aux() calls VbglR0SfRead() | |
477 | * which works on virtual addresses. On Linux cannot reliably determine the | |
478 | * physical address for high memory, see rtR0MemObjNativeLockKernel(). */ | |
479 | page = alloc_page(GFP_USER); | |
480 | if (!page) { | |
481 | LogRelFunc(("failed to allocate page\n")); | |
482 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25) | |
483 | return VM_FAULT_OOM; | |
484 | #else | |
485 | SET_TYPE(VM_FAULT_OOM); | |
486 | return NOPAGE_OOM; | |
487 | #endif | |
488 | } | |
489 | ||
490 | buf = kmap(page); | |
491 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25) | |
492 | off = (vmf->pgoff << PAGE_SHIFT); | |
493 | #else | |
494 | off = (vaddr - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT); | |
495 | #endif | |
496 | err = sf_reg_read_aux(__func__, sf_g, sf_r, buf, &nread, off); | |
497 | if (err) | |
498 | { | |
499 | kunmap(page); | |
500 | put_page(page); | |
501 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25) | |
502 | return VM_FAULT_SIGBUS; | |
503 | #else | |
504 | SET_TYPE(VM_FAULT_SIGBUS); | |
505 | return NOPAGE_SIGBUS; | |
506 | #endif | |
507 | } | |
508 | ||
509 | BUG_ON (nread > PAGE_SIZE); | |
510 | if (!nread) | |
511 | { | |
512 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25) | |
513 | clear_user_page(page_address(page), vmf->pgoff, page); | |
514 | #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) | |
515 | clear_user_page(page_address(page), vaddr, page); | |
516 | #else | |
517 | clear_user_page(page_address(page), vaddr); | |
518 | #endif | |
519 | } | |
520 | else | |
521 | memset(buf + nread, 0, PAGE_SIZE - nread); | |
522 | ||
523 | flush_dcache_page(page); | |
524 | kunmap(page); | |
525 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25) | |
526 | vmf->page = page; | |
527 | return 0; | |
528 | #else | |
529 | SET_TYPE(VM_FAULT_MAJOR); | |
530 | return page; | |
531 | #endif | |
532 | } | |
533 | ||
534 | static struct vm_operations_struct sf_vma_ops = | |
535 | { | |
536 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 25) | |
537 | .fault = sf_reg_fault | |
538 | #else | |
539 | .nopage = sf_reg_nopage | |
540 | #endif | |
541 | }; | |
542 | ||
543 | static int sf_reg_mmap(struct file *file, struct vm_area_struct *vma) | |
544 | { | |
545 | TRACE(); | |
546 | if (vma->vm_flags & VM_SHARED) | |
547 | { | |
548 | LogFunc(("shared mmapping not available\n")); | |
549 | return -EINVAL; | |
550 | } | |
551 | ||
552 | vma->vm_ops = &sf_vma_ops; | |
553 | return 0; | |
554 | } | |
555 | ||
556 | struct file_operations sf_reg_fops = | |
557 | { | |
558 | .read = sf_reg_read, | |
559 | .open = sf_reg_open, | |
560 | .write = sf_reg_write, | |
561 | .release = sf_reg_release, | |
562 | .mmap = sf_reg_mmap, | |
563 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) | |
564 | # if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) | |
565 | .splice_read = generic_file_splice_read, | |
566 | # else | |
567 | .sendfile = generic_file_sendfile, | |
568 | # endif | |
569 | # if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0) | |
570 | .read_iter = generic_file_read_iter, | |
571 | .write_iter = generic_file_write_iter, | |
572 | # else | |
573 | .aio_read = generic_file_aio_read, | |
574 | .aio_write = generic_file_aio_write, | |
575 | # endif | |
576 | # if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 35) | |
577 | .fsync = noop_fsync, | |
578 | # else | |
579 | .fsync = simple_sync_file, | |
580 | # endif | |
581 | .llseek = generic_file_llseek, | |
582 | #endif | |
583 | }; | |
584 | ||
585 | ||
586 | struct inode_operations sf_reg_iops = | |
587 | { | |
588 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) | |
589 | .revalidate = sf_inode_revalidate | |
590 | #else | |
591 | .getattr = sf_getattr, | |
592 | .setattr = sf_setattr | |
593 | #endif | |
594 | }; | |
595 | ||
596 | ||
597 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) | |
598 | static int sf_readpage(struct file *file, struct page *page) | |
599 | { | |
600 | struct inode *inode = GET_F_DENTRY(file)->d_inode; | |
601 | struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb); | |
602 | struct sf_reg_info *sf_r = file->private_data; | |
603 | uint32_t nread = PAGE_SIZE; | |
604 | char *buf; | |
605 | loff_t off = ((loff_t)page->index) << PAGE_SHIFT; | |
606 | int ret; | |
607 | ||
608 | TRACE(); | |
609 | ||
610 | buf = kmap(page); | |
611 | ret = sf_reg_read_aux(__func__, sf_g, sf_r, buf, &nread, off); | |
612 | if (ret) | |
613 | { | |
614 | kunmap(page); | |
615 | if (PageLocked(page)) | |
616 | unlock_page(page); | |
617 | return ret; | |
618 | } | |
619 | BUG_ON(nread > PAGE_SIZE); | |
620 | memset(&buf[nread], 0, PAGE_SIZE - nread); | |
621 | flush_dcache_page(page); | |
622 | kunmap(page); | |
623 | SetPageUptodate(page); | |
624 | unlock_page(page); | |
625 | return 0; | |
626 | } | |
627 | ||
628 | static int | |
629 | sf_writepage(struct page *page, struct writeback_control *wbc) | |
630 | { | |
631 | struct address_space *mapping = page->mapping; | |
632 | struct inode *inode = mapping->host; | |
633 | struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb); | |
634 | struct sf_inode_info *sf_i = GET_INODE_INFO(inode); | |
635 | struct file *file = sf_i->file; | |
636 | struct sf_reg_info *sf_r = file->private_data; | |
637 | char *buf; | |
638 | uint32_t nwritten = PAGE_SIZE; | |
639 | int end_index = inode->i_size >> PAGE_SHIFT; | |
640 | loff_t off = ((loff_t) page->index) << PAGE_SHIFT; | |
641 | int err; | |
642 | ||
643 | TRACE(); | |
644 | ||
645 | if (page->index >= end_index) | |
646 | nwritten = inode->i_size & (PAGE_SIZE-1); | |
647 | ||
648 | buf = kmap(page); | |
649 | ||
650 | err = sf_reg_write_aux(__func__, sf_g, sf_r, buf, &nwritten, off); | |
651 | if (err < 0) | |
652 | { | |
653 | ClearPageUptodate(page); | |
654 | goto out; | |
655 | } | |
656 | ||
657 | if (off > inode->i_size) | |
658 | inode->i_size = off; | |
659 | ||
660 | if (PageError(page)) | |
661 | ClearPageError(page); | |
662 | err = 0; | |
663 | ||
664 | out: | |
665 | kunmap(page); | |
666 | ||
667 | unlock_page(page); | |
668 | return err; | |
669 | } | |
670 | ||
671 | # if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
672 | int sf_write_begin(struct file *file, struct address_space *mapping, loff_t pos, | |
673 | unsigned len, unsigned flags, struct page **pagep, void **fsdata) | |
674 | { | |
675 | TRACE(); | |
676 | ||
677 | return simple_write_begin(file, mapping, pos, len, flags, pagep, fsdata); | |
678 | } | |
679 | ||
680 | int sf_write_end(struct file *file, struct address_space *mapping, loff_t pos, | |
681 | unsigned len, unsigned copied, struct page *page, void *fsdata) | |
682 | { | |
683 | struct inode *inode = mapping->host; | |
684 | struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb); | |
685 | struct sf_reg_info *sf_r = file->private_data; | |
686 | void *buf; | |
687 | unsigned from = pos & (PAGE_SIZE - 1); | |
688 | uint32_t nwritten = len; | |
689 | int err; | |
690 | ||
691 | TRACE(); | |
692 | ||
693 | buf = kmap(page); | |
694 | err = sf_reg_write_aux(__func__, sf_g, sf_r, buf+from, &nwritten, pos); | |
695 | kunmap(page); | |
696 | ||
697 | if (!PageUptodate(page) && err == PAGE_SIZE) | |
698 | SetPageUptodate(page); | |
699 | ||
700 | if (err >= 0) { | |
701 | pos += nwritten; | |
702 | if (pos > inode->i_size) | |
703 | inode->i_size = pos; | |
704 | } | |
705 | ||
706 | unlock_page(page); | |
707 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0) | |
708 | put_page(page); | |
709 | #else | |
710 | page_cache_release(page); | |
711 | #endif | |
712 | ||
713 | return nwritten; | |
714 | } | |
715 | ||
716 | # endif /* KERNEL_VERSION >= 2.6.24 */ | |
717 | ||
718 | struct address_space_operations sf_reg_aops = | |
719 | { | |
720 | .readpage = sf_readpage, | |
721 | .writepage = sf_writepage, | |
722 | # if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
723 | .write_begin = sf_write_begin, | |
724 | .write_end = sf_write_end, | |
725 | # else | |
726 | .prepare_write = simple_prepare_write, | |
727 | .commit_write = simple_commit_write, | |
728 | # endif | |
729 | }; | |
730 | #endif |