Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * file.c | |
3 | * | |
4 | * Copyright (C) 1995, 1996, 1997 by Paal-Kr. Engstad and Volker Lendecke | |
5 | * Copyright (C) 1997 by Volker Lendecke | |
6 | * | |
7 | * Please add a note about your changes to smbfs in the ChangeLog file. | |
8 | */ | |
9 | ||
10 | #include <linux/time.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/fcntl.h> | |
14 | #include <linux/stat.h> | |
15 | #include <linux/mm.h> | |
1da177e4 LT |
16 | #include <linux/pagemap.h> |
17 | #include <linux/smp_lock.h> | |
18 | #include <linux/net.h> | |
e8edc6e0 | 19 | #include <linux/aio.h> |
1da177e4 LT |
20 | |
21 | #include <asm/uaccess.h> | |
22 | #include <asm/system.h> | |
23 | ||
24 | #include <linux/smbno.h> | |
25 | #include <linux/smb_fs.h> | |
26 | ||
27 | #include "smb_debug.h" | |
28 | #include "proto.h" | |
29 | ||
30 | static int | |
31 | smb_fsync(struct file *file, struct dentry * dentry, int datasync) | |
32 | { | |
33 | struct smb_sb_info *server = server_from_dentry(dentry); | |
34 | int result; | |
35 | ||
36 | VERBOSE("sync file %s/%s\n", DENTRY_PATH(dentry)); | |
37 | ||
38 | /* | |
39 | * The VFS will writepage() all dirty pages for us, but we | |
40 | * should send a SMBflush to the server, letting it know that | |
41 | * we want things synchronized with actual storage. | |
42 | * | |
43 | * Note: this function requires all pages to have been written already | |
44 | * (should be ok with writepage_sync) | |
45 | */ | |
46 | result = smb_proc_flush(server, SMB_I(dentry->d_inode)->fileid); | |
47 | return result; | |
48 | } | |
49 | ||
50 | /* | |
51 | * Read a page synchronously. | |
52 | */ | |
53 | static int | |
54 | smb_readpage_sync(struct dentry *dentry, struct page *page) | |
55 | { | |
56 | char *buffer = kmap(page); | |
57 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
58 | struct smb_sb_info *server = server_from_dentry(dentry); | |
59 | unsigned int rsize = smb_get_rsize(server); | |
60 | int count = PAGE_SIZE; | |
61 | int result; | |
62 | ||
63 | VERBOSE("file %s/%s, count=%d@%Ld, rsize=%d\n", | |
64 | DENTRY_PATH(dentry), count, offset, rsize); | |
65 | ||
66 | result = smb_open(dentry, SMB_O_RDONLY); | |
67 | if (result < 0) | |
68 | goto io_error; | |
69 | ||
70 | do { | |
71 | if (count < rsize) | |
72 | rsize = count; | |
73 | ||
74 | result = server->ops->read(dentry->d_inode,offset,rsize,buffer); | |
75 | if (result < 0) | |
76 | goto io_error; | |
77 | ||
78 | count -= result; | |
79 | offset += result; | |
80 | buffer += result; | |
81 | dentry->d_inode->i_atime = | |
82 | current_fs_time(dentry->d_inode->i_sb); | |
83 | if (result < rsize) | |
84 | break; | |
85 | } while (count); | |
86 | ||
87 | memset(buffer, 0, count); | |
88 | flush_dcache_page(page); | |
89 | SetPageUptodate(page); | |
90 | result = 0; | |
91 | ||
92 | io_error: | |
93 | kunmap(page); | |
94 | unlock_page(page); | |
95 | return result; | |
96 | } | |
97 | ||
98 | /* | |
99 | * We are called with the page locked and we unlock it when done. | |
100 | */ | |
101 | static int | |
102 | smb_readpage(struct file *file, struct page *page) | |
103 | { | |
104 | int error; | |
17b75e69 | 105 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
106 | |
107 | page_cache_get(page); | |
108 | error = smb_readpage_sync(dentry, page); | |
109 | page_cache_release(page); | |
110 | return error; | |
111 | } | |
112 | ||
113 | /* | |
114 | * Write a page synchronously. | |
115 | * Offset is the data offset within the page. | |
116 | */ | |
117 | static int | |
118 | smb_writepage_sync(struct inode *inode, struct page *page, | |
119 | unsigned long pageoffset, unsigned int count) | |
120 | { | |
121 | loff_t offset; | |
122 | char *buffer = kmap(page) + pageoffset; | |
123 | struct smb_sb_info *server = server_from_inode(inode); | |
124 | unsigned int wsize = smb_get_wsize(server); | |
125 | int ret = 0; | |
126 | ||
127 | offset = ((loff_t)page->index << PAGE_CACHE_SHIFT) + pageoffset; | |
128 | VERBOSE("file ino=%ld, fileid=%d, count=%d@%Ld, wsize=%d\n", | |
129 | inode->i_ino, SMB_I(inode)->fileid, count, offset, wsize); | |
130 | ||
131 | do { | |
132 | int write_ret; | |
133 | ||
134 | if (count < wsize) | |
135 | wsize = count; | |
136 | ||
137 | write_ret = server->ops->write(inode, offset, wsize, buffer); | |
138 | if (write_ret < 0) { | |
139 | PARANOIA("failed write, wsize=%d, write_ret=%d\n", | |
140 | wsize, write_ret); | |
141 | ret = write_ret; | |
142 | break; | |
143 | } | |
144 | /* N.B. what if result < wsize?? */ | |
145 | #ifdef SMBFS_PARANOIA | |
146 | if (write_ret < wsize) | |
147 | PARANOIA("short write, wsize=%d, write_ret=%d\n", | |
148 | wsize, write_ret); | |
149 | #endif | |
150 | buffer += wsize; | |
151 | offset += wsize; | |
152 | count -= wsize; | |
153 | /* | |
154 | * Update the inode now rather than waiting for a refresh. | |
155 | */ | |
156 | inode->i_mtime = inode->i_atime = current_fs_time(inode->i_sb); | |
157 | SMB_I(inode)->flags |= SMB_F_LOCALWRITE; | |
158 | if (offset > inode->i_size) | |
159 | inode->i_size = offset; | |
160 | } while (count); | |
161 | ||
162 | kunmap(page); | |
163 | return ret; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Write a page to the server. This will be used for NFS swapping only | |
168 | * (for now), and we currently do this synchronously only. | |
169 | * | |
170 | * We are called with the page locked and we unlock it when done. | |
171 | */ | |
172 | static int | |
173 | smb_writepage(struct page *page, struct writeback_control *wbc) | |
174 | { | |
175 | struct address_space *mapping = page->mapping; | |
176 | struct inode *inode; | |
177 | unsigned long end_index; | |
178 | unsigned offset = PAGE_CACHE_SIZE; | |
179 | int err; | |
180 | ||
5df0d312 | 181 | BUG_ON(!mapping); |
1da177e4 | 182 | inode = mapping->host; |
5df0d312 | 183 | BUG_ON(!inode); |
1da177e4 LT |
184 | |
185 | end_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
186 | ||
187 | /* easy case */ | |
188 | if (page->index < end_index) | |
189 | goto do_it; | |
190 | /* things got complicated... */ | |
191 | offset = inode->i_size & (PAGE_CACHE_SIZE-1); | |
192 | /* OK, are we completely out? */ | |
193 | if (page->index >= end_index+1 || !offset) | |
194 | return 0; /* truncated - don't care */ | |
195 | do_it: | |
196 | page_cache_get(page); | |
197 | err = smb_writepage_sync(inode, page, 0, offset); | |
198 | SetPageUptodate(page); | |
199 | unlock_page(page); | |
200 | page_cache_release(page); | |
201 | return err; | |
202 | } | |
203 | ||
204 | static int | |
205 | smb_updatepage(struct file *file, struct page *page, unsigned long offset, | |
206 | unsigned int count) | |
207 | { | |
17b75e69 | 208 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 | 209 | |
54b21a79 AM |
210 | DEBUG1("(%s/%s %d@%lld)\n", DENTRY_PATH(dentry), count, |
211 | ((unsigned long long)page->index << PAGE_CACHE_SHIFT) + offset); | |
1da177e4 LT |
212 | |
213 | return smb_writepage_sync(dentry->d_inode, page, offset, count); | |
214 | } | |
215 | ||
216 | static ssize_t | |
543ade1f BP |
217 | smb_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
218 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 219 | { |
543ade1f | 220 | struct file * file = iocb->ki_filp; |
17b75e69 | 221 | struct dentry * dentry = file->f_path.dentry; |
1da177e4 LT |
222 | ssize_t status; |
223 | ||
224 | VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry), | |
543ade1f | 225 | (unsigned long) iocb->ki_left, (unsigned long) pos); |
1da177e4 LT |
226 | |
227 | status = smb_revalidate_inode(dentry); | |
228 | if (status) { | |
229 | PARANOIA("%s/%s validation failed, error=%Zd\n", | |
230 | DENTRY_PATH(dentry), status); | |
231 | goto out; | |
232 | } | |
233 | ||
234 | VERBOSE("before read, size=%ld, flags=%x, atime=%ld\n", | |
235 | (long)dentry->d_inode->i_size, | |
dbaf4c02 | 236 | dentry->d_inode->i_flags, dentry->d_inode->i_atime.tv_sec); |
1da177e4 | 237 | |
543ade1f | 238 | status = generic_file_aio_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
239 | out: |
240 | return status; | |
241 | } | |
242 | ||
243 | static int | |
244 | smb_file_mmap(struct file * file, struct vm_area_struct * vma) | |
245 | { | |
17b75e69 | 246 | struct dentry * dentry = file->f_path.dentry; |
1da177e4 LT |
247 | int status; |
248 | ||
249 | VERBOSE("file %s/%s, address %lu - %lu\n", | |
250 | DENTRY_PATH(dentry), vma->vm_start, vma->vm_end); | |
251 | ||
252 | status = smb_revalidate_inode(dentry); | |
253 | if (status) { | |
254 | PARANOIA("%s/%s validation failed, error=%d\n", | |
255 | DENTRY_PATH(dentry), status); | |
256 | goto out; | |
257 | } | |
258 | status = generic_file_mmap(file, vma); | |
259 | out: | |
260 | return status; | |
261 | } | |
262 | ||
263 | static ssize_t | |
5ffc4ef4 JA |
264 | smb_file_splice_read(struct file *file, loff_t *ppos, |
265 | struct pipe_inode_info *pipe, size_t count, | |
266 | unsigned int flags) | |
1da177e4 | 267 | { |
17b75e69 | 268 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
269 | ssize_t status; |
270 | ||
dbaf4c02 | 271 | VERBOSE("file %s/%s, pos=%Ld, count=%lu\n", |
1da177e4 LT |
272 | DENTRY_PATH(dentry), *ppos, count); |
273 | ||
274 | status = smb_revalidate_inode(dentry); | |
275 | if (status) { | |
276 | PARANOIA("%s/%s validation failed, error=%Zd\n", | |
277 | DENTRY_PATH(dentry), status); | |
278 | goto out; | |
279 | } | |
5ffc4ef4 | 280 | status = generic_file_splice_read(file, ppos, pipe, count, flags); |
1da177e4 LT |
281 | out: |
282 | return status; | |
283 | } | |
284 | ||
285 | /* | |
286 | * This does the "real" work of the write. The generic routine has | |
287 | * allocated the page, locked it, done all the page alignment stuff | |
288 | * calculations etc. Now we should just copy the data from user | |
289 | * space and write it back to the real medium.. | |
290 | * | |
291 | * If the writer ends up delaying the write, the writer needs to | |
292 | * increment the page use counts until he is done with the page. | |
293 | */ | |
fb53b309 NP |
294 | static int smb_write_begin(struct file *file, struct address_space *mapping, |
295 | loff_t pos, unsigned len, unsigned flags, | |
296 | struct page **pagep, void **fsdata) | |
1da177e4 | 297 | { |
fb53b309 | 298 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
54566b2c | 299 | *pagep = grab_cache_page_write_begin(mapping, index, flags); |
fb53b309 NP |
300 | if (!*pagep) |
301 | return -ENOMEM; | |
1da177e4 LT |
302 | return 0; |
303 | } | |
304 | ||
fb53b309 NP |
305 | static int smb_write_end(struct file *file, struct address_space *mapping, |
306 | loff_t pos, unsigned len, unsigned copied, | |
307 | struct page *page, void *fsdata) | |
1da177e4 LT |
308 | { |
309 | int status; | |
fb53b309 | 310 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
1da177e4 | 311 | |
1da177e4 | 312 | lock_kernel(); |
fb53b309 | 313 | status = smb_updatepage(file, page, offset, copied); |
1da177e4 | 314 | unlock_kernel(); |
fb53b309 NP |
315 | |
316 | if (!status) { | |
317 | if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
318 | SetPageUptodate(page); | |
319 | status = copied; | |
320 | } | |
321 | ||
322 | unlock_page(page); | |
323 | page_cache_release(page); | |
324 | ||
1da177e4 LT |
325 | return status; |
326 | } | |
327 | ||
f5e54d6e | 328 | const struct address_space_operations smb_file_aops = { |
1da177e4 LT |
329 | .readpage = smb_readpage, |
330 | .writepage = smb_writepage, | |
fb53b309 NP |
331 | .write_begin = smb_write_begin, |
332 | .write_end = smb_write_end, | |
1da177e4 LT |
333 | }; |
334 | ||
335 | /* | |
336 | * Write to a file (through the page cache). | |
337 | */ | |
338 | static ssize_t | |
543ade1f BP |
339 | smb_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
340 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 341 | { |
543ade1f | 342 | struct file * file = iocb->ki_filp; |
17b75e69 | 343 | struct dentry * dentry = file->f_path.dentry; |
1da177e4 LT |
344 | ssize_t result; |
345 | ||
346 | VERBOSE("file %s/%s, count=%lu@%lu\n", | |
347 | DENTRY_PATH(dentry), | |
543ade1f | 348 | (unsigned long) iocb->ki_left, (unsigned long) pos); |
1da177e4 LT |
349 | |
350 | result = smb_revalidate_inode(dentry); | |
351 | if (result) { | |
352 | PARANOIA("%s/%s validation failed, error=%Zd\n", | |
353 | DENTRY_PATH(dentry), result); | |
354 | goto out; | |
355 | } | |
356 | ||
357 | result = smb_open(dentry, SMB_O_WRONLY); | |
358 | if (result) | |
359 | goto out; | |
360 | ||
543ade1f BP |
361 | if (iocb->ki_left > 0) { |
362 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); | |
1da177e4 LT |
363 | VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n", |
364 | (long) file->f_pos, (long) dentry->d_inode->i_size, | |
dbaf4c02 JL |
365 | dentry->d_inode->i_mtime.tv_sec, |
366 | dentry->d_inode->i_atime.tv_sec); | |
1da177e4 LT |
367 | } |
368 | out: | |
369 | return result; | |
370 | } | |
371 | ||
372 | static int | |
373 | smb_file_open(struct inode *inode, struct file * file) | |
374 | { | |
375 | int result; | |
17b75e69 | 376 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
377 | int smb_mode = (file->f_mode & O_ACCMODE) - 1; |
378 | ||
379 | lock_kernel(); | |
380 | result = smb_open(dentry, smb_mode); | |
381 | if (result) | |
382 | goto out; | |
383 | SMB_I(inode)->openers++; | |
384 | out: | |
385 | unlock_kernel(); | |
386 | return result; | |
387 | } | |
388 | ||
389 | static int | |
390 | smb_file_release(struct inode *inode, struct file * file) | |
391 | { | |
392 | lock_kernel(); | |
393 | if (!--SMB_I(inode)->openers) { | |
394 | /* We must flush any dirty pages now as we won't be able to | |
395 | write anything after close. mmap can trigger this. | |
396 | "openers" should perhaps include mmap'ers ... */ | |
28fd1298 | 397 | filemap_write_and_wait(inode->i_mapping); |
1da177e4 LT |
398 | smb_close(inode); |
399 | } | |
400 | unlock_kernel(); | |
401 | return 0; | |
402 | } | |
403 | ||
404 | /* | |
405 | * Check whether the required access is compatible with | |
406 | * an inode's permission. SMB doesn't recognize superuser | |
407 | * privileges, so we need our own check for this. | |
408 | */ | |
409 | static int | |
e6305c43 | 410 | smb_file_permission(struct inode *inode, int mask) |
1da177e4 LT |
411 | { |
412 | int mode = inode->i_mode; | |
413 | int error = 0; | |
414 | ||
415 | VERBOSE("mode=%x, mask=%x\n", mode, mask); | |
416 | ||
417 | /* Look at user permissions */ | |
418 | mode >>= 6; | |
e6305c43 | 419 | if (mask & ~mode & (MAY_READ | MAY_WRITE | MAY_EXEC)) |
1da177e4 LT |
420 | error = -EACCES; |
421 | return error; | |
422 | } | |
423 | ||
9465efc9 AK |
424 | static loff_t smb_remote_llseek(struct file *file, loff_t offset, int origin) |
425 | { | |
426 | loff_t ret; | |
427 | lock_kernel(); | |
428 | ret = generic_file_llseek_unlocked(file, offset, origin); | |
429 | unlock_kernel(); | |
430 | return ret; | |
431 | } | |
432 | ||
4b6f5d20 | 433 | const struct file_operations smb_file_operations = |
1da177e4 | 434 | { |
9465efc9 | 435 | .llseek = smb_remote_llseek, |
543ade1f BP |
436 | .read = do_sync_read, |
437 | .aio_read = smb_file_aio_read, | |
438 | .write = do_sync_write, | |
439 | .aio_write = smb_file_aio_write, | |
1da177e4 LT |
440 | .ioctl = smb_ioctl, |
441 | .mmap = smb_file_mmap, | |
442 | .open = smb_file_open, | |
443 | .release = smb_file_release, | |
444 | .fsync = smb_fsync, | |
5ffc4ef4 | 445 | .splice_read = smb_file_splice_read, |
1da177e4 LT |
446 | }; |
447 | ||
c5ef1c42 | 448 | const struct inode_operations smb_file_inode_operations = |
1da177e4 LT |
449 | { |
450 | .permission = smb_file_permission, | |
451 | .getattr = smb_getattr, | |
452 | .setattr = smb_notify_change, | |
453 | }; |