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